Input and Output Devices (Chapter 4) PDF

Chapter 4 Input and Output Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. L...

Chapter 4 Input and Output Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Learning Objectives (1 of 2) Explain the purpose of a computer keyboard and the types of keyboards widely used today. List several different pointing devices and describe their functions. Describe the purposes of scanners and readers and list some types of scanners and readers in use today. Explain what digital cameras are and how they are used today. Understand the devices that can be used for audio input. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Learning Objectives (2 of 2) Describe the characteristics of a display device and explain some of the technologies used to display images. List several types of printers and explain their functions. Identify the hardware devices typically used for audio output. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Overview This chapter covers: The most common input devices Hardware designed for capturing data in electronic form Audio input Types of display devices and how they work Types of printers and how they work Audio output devices Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Keyboards A keyboard is an input device used to enter characters at the location marked by the insertion point or cursor Can be built-in, wired, or wireless Typically contains: Standard alphanumeric keys Numeric keypad Function keys Delete and Backspace keys Ctrl and Alt keys Arrow keys Special-purpose keys Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. A Typical Desktop Keyboard FIGURE 4-1: A typical desktop keyboard. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Keyboards for Mobile Devices (1 of 2) Mobile devices often use: Slide-out keyboard Pen or touch input (on-screen keyboard) Can use an external keyboard (stand-alone or built into a case) Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Keyboards for Mobile Devices (2 of 2) FIGURE 4-2: Keyboards for mobile devices. Source: Nuance Source: Logitech Source: Whirlscape ON-SCREEN KEYBOARD UNIVERSAL KEYBOARD ONE-ROW KEYBOARD This keyboard is using the Swype This keyboard can connect wirelessly This on-screen keyboard uses app in which the user continuously to three devices at once and the user software to try to determine and drags through the letters in a word can switch between those devices. predict what the user is typing. for faster input. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pointing Devices Pointing devices are used to: Select and manipulate objects Input data Issue commands to the computer Common types of pointing devices: Mouse Pen/stylus Devices that use touch input Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Mice A mouse is a common pointing device that the user slides to move a pointer around the screen and clicks to make selections Older mechanical mice use a ball Optical or laser mice track with light Touch mice support two-dimensional gestures Used to start programs; open, move around, and edit documents; draw or edit images; and more Can be used with a variety of devices Typically connect via a USB port or a wireless connection Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.  Common Mice and Mouse Operations FIGURE 4-3: Mice. FIGURE 4-4: Common mouse operations. TRADITIONAL MICE Source: Logitech Support pointing, clicking, TOUCH MICE and scrolling. Support swiping, tapping, and other navigational gestures. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pens/Styluses A stylus is a pen-like device used to draw or write electronically on the screen Also called digital pen, electronic pen, or pen Pen input is being used for: Photography, graphic design, animation Industrial design, document processing, and healthcare applications Navigating through a document Issuing commands Handwritten input and drawings Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Pen-Based Computers and Mobile Devices Pen input is often used with mobile devices and tablets Can be used with desktop and portable computers if the display screen supports it FIGURE 4-5: Pen-based computers and mobile devices. Source: Samsung Electronics Co., Ltd Source: Microsoft Corporation Source: Wacom Company SMARTPHONES TABLET COMPUTERS DESKTOP COMPUTERS Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Digital Forms With handwriting FIGURE 4-6: Digital forms. If the software supports it, the text handwritten on a digital form can be converted by the computer recognition, written text can to typed text. be converted to editable typed text The use of digital forms is increasingly Source: Mi-Co Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Other Uses for Digital Pens Digital writing systems are pen-based systems that capture handwritten input as it is being written Requires special paper with a grid of dots Transfers handwritten input to computer Graphics tablets are flat, touch sensitive tablets typically connected to computer using a USB port Also called pen tablets or digitizing devices Signature capture devices are used to record signatures for credit card purchases, deliveries, etc. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of Digital Pens in Use FIGURE 4-7: Other uses for digital pens. Source: Livescribe, Inc. Source: Wacom Company SIGNATURE CAPTURE DEVICES DIGITAL WRITING SYSTEMS GRAPHICS/PEN TABLETS Record signatures for purchases, deliveries, and other applications Record all input written on the paper Transfer all input written or drawn on that require recorded authorization. and transfer it to a device either in real the tablet to the computer in real time or when directed by the user. time and allow the use of pen navigation tools. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Touch Screens Touch screens are display devices that are touched with the finger to select commands or otherwise provide input to the computer Common on portable computers, smartphones, and other mobile devices Multi-touch screens can recognize input from more than one finger at a time Some support both touch and pen input Surface Hub (large multi-touch wall-mounted display) Table PC (large computer either built into a table or designed to be used on a table) Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of Touch Screens FIGURE 4-8: Touch screens. PERSONAL Source: Amazon.com, Inc. Source: Microsoft Source: Lenovo COMPUTERS Corporation MOBILE DEVICES TABLE PCS SURFACE HUBS Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Other Pointing Devices Gaming devices FIGURE 4-9: Other common pointing devices. Trackballs Control buttons and wheels Touch pads Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. How It Works Augmented Reality Overlays computer generated images on top of real-time images Today, most often with smartphones using camera input, location info, and other data Displays appropriate information related to images captured by the smartphone Source: Nokia A smartphone AR app pointing at a business district. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Scanners, Readers, and Digital Cameras Some devices capture data initially FIGURE 4-10: Source data automation. in digital form Others capture data from source documents Already exist in physical form (photographs, checks, invoices, or product labels) Source data automation Saves time Source: Motion Computing CAPTURING DATA FROM ITS Increases accuracy RECORDING DATA DIRECTLY SOURCE DOCUMENT INTO A COMPUTER Utilizes scanning or reading devices Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Scanners A scanner (optical scanner) is an input device that captures an image of an object in digital form Data is typically input as a single image Can scan photos, documents, images, etc. Types of scanners Flatbed scanners (scan flat objects one page at a time) Portable scanners (scan objects while on the go) 3D scanners (scan objects in 3 D) There are also task-specific scanners, such as receipt and business card scanners Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.  Examples of Scanners FIGURE 4-11: Scanners. FLATBED SCANNERS Source: Wizcomtech LTD PORTABLE 3D SCANNERS Used to input digital copies of photos, PORTABLE SCANNERS Used to capture 3D digital images sketches, slides, book pages, and of a person or an object. other relatively flat documents into the Used to capture digital copies of documents computer. while on the go; the data is typically transferred to a computer at a later time. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Scanning Quality and Resolution Quality of scanned images FIGURE 4-12: Scanning resolution. indicated by optical resolution Measured in number of dots per inch (dpi) Can often be specified when image is scanned Can be changed when scanned image is edited Higher resolution means better quality but larger file size RESOLUTION Most scanners let you specify the resolution (in d pi) to use for the scan. High-resolution images look sharper but result in larger file sizes. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Barcodes and Barcode Readers Barcodes are machine-readable optical codes that represent data as a set of bars Barcode readers are input devices that read barcodes Types of barcodes Read by traditional barcode reader Universal Product Code (UPC) ISBN Code 39 Read by mobile apps QR Codes (two-dimensional; hold much more data) Digital watermarks (icons) Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of Barcodes and Digital Watermark Icons FIGURE 4-13: Barcodes and digital watermark icons.. Source: Motorola Solutions Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of Barcode Readers FIGURE 4-14: Barcode readers. FIXED BARCODE READERS PORTABLE BARCODE READERS INTEGRATED BARCODE READERS Used most often in retail point-of- Used when portability is needed. sale applications. Used most often for consumer applications. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Radio Frequency ID (RFID) (1 of 2) Radio Frequency Identification (RFID) is a technology that stores, reads, and transmits data located in RFID tags RFID tags contain tiny chips and radio antennas Can be attached to objects Read by RFID readers Handheld, portal, and stationary Tags only need to be within range of the reader, rather than in line of sight Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Radio Frequency ID (RFID) (2 of 2) Used for a variety of applications FIGURE 4-15: R F I D tags. Tracking inventory and assets Electronic toll collection Tracking patients in hospitals Ticketing applications IDs (driver licenses, U.S. passports, etc.) Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Near Field Communications (NFC) Near Field Communications (NFC) is a short-range wireless communication standard based on RFID Used to transfer information between smartphones or between a smartphone and an NFC-enable reader Used for contactless mobile payments Credit card or smartphone containing the N FC technology needs to be within an inch or so of the NFC-enabled payment terminal More appropriate than conventional RFID for mobile payments Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of RFID and NFC Applications (1 of 2) FIGURE 4-16: RFID and NFC applications. SHIPPING WAREHOUSING This portal RFID reader reads RFID tags attached This handheld RFID reader is used to read the R to the shipping container or to items inside the FID tags located on the warehouse shelves, as container as it passes through the portal. well as on the pallets currently stored there. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of RFID and NFC Applications (2 of 2) FIGURE 4-16: RFID and NFC applications (continued) Source: MasterCard Worldwide Source: teamaxess.com MOBILE PAYMENTS TICKETING This stationary NFC reader is used at checkout This stationary RFID reader is used to locations to process payments via NFC-enabled automatically open ski lift entry gates for valid credit cards or smartphones. lift ticket holders at a ski resort in Utah. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Optical Mark Readers (OMR) and Optical Character Recognition (OCR) Optical mark readers (OMRs) input data from optical forms to score or tally exams, questionnaires, ballots Optical character recognition (OCR) recognizes text characters and converts them to electronic form as text, not images Identifies each character and convert it to editable text Used to process turnaround documents like monthly bills Read by OCR devices Optical characters are designed to be read by O CR devices but can still be read by humans Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. OMR Readers and Optical Characters FIGURE 4-17: Optical mark readers FIGURE 4-18: Optical characters. Are (OMRs). Are commonly used to score often used in turnaround documents, tests and tally questionnaires. such as on this utility bill. Source: Scantron Corporation Source: NV Energy Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Magnetic Ink Character Recognition (MICR ) Readers Magnetic ink character FIGURE 4-19: Magnetic ink character recognition (MICR) readers are used recognition (MICR) is used primarily to process checks. primarily for banking to facilitate check processing MICR readers (check scanners) read the MICR characters printed at the bottom of checks Used by banks Used by businesses to remotely deposit checks Individuals typically use ATMs or mobile deposit instead Source: Epson America, Inc. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Technology and You Mobile Payments and Digital Wallets Digital wallets, like Apple Pay and Google Wallet, store payment information to pay for purchases Mobile digital wallets are stored on mobile devices Typically use NFC Competing NFC readers Mobile payments can also be made via Source: Verifone. mobile credit card readers, mobile An NFC-enabled payment terminal. banking apps, or mobile payment apps (Square Cash or PayPal) Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Biometric Readers Biometric readers are used to FIGURE 4-20: Biometric readers. input biometric data such as an individual’s fingerprint or voice Can be stand-alone readers or built into another piece of hardware Most often used for access control, to authorize electronic payments, and to log on to secure Web sites Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Digital Cameras Digital cameras take pictures and records them as digital images Can be still cameras and/or video cameras Integrated into portable computers, smartphones, and tablets Digital still cameras Primary appeal is that images are immediately available Camera quality is measured in megapixels Typically use flash memory for storage Slight delay when taking photos Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of Digital Still Cameras FIGURE 4-21: Digital still cameras. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Digital Video Cameras (1 of 2) Digital video cameras Digital camcorders, PC video cameras (PC cams, webcams) Built-in and stand-alone cameras Store images on digital media (flash memory, D VDs, hard drives, etc.) Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Digital Video Cameras (2 of 2) Applications FIGURE 4-22: Digital video cameras. Live video feeds and recorded video Surveillance Video conferences, phone calls, and Webinars Face recognition systems Source: Sony Electronics Source: Tango DIGITAL CAMCORDERS INTEGRATED VIDEO CAMERAS Typically store video on a built-in Commonly used to deliver video hard drive (as in this camera) or over the Internet, such as during a on embedded flash memory. video phone call as shown here. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Audio Input Audio input The process of entering audio data into the computer Voice input Inputting spoken words and converting them to digital form via microphone or headset Used in conjunction with sound recorder software Speech recognition systems enable the device being used to recognize voice input as spoken words Can be used for dictation as well to as to issue commands to the device Usually incorporated into smartphones, GPS systems, and other mobile devices Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Example of a Speech Recognition System FIGURE 4-23: Speech recognition system. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Music Input Systems Music input systems input music into a FIGURE 4-24: Music input systems. Musicians can input original compositions into computer or other device a computer via microphones, MIDI keyboards Existing music can be input using CDs and guitars, and other devices. or a Web download For original compositions, microphones, keyboard controllers, and guitar controllers can be used to input music Inputted music can be edited, saved, played, etc. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Quick Quiz 2 1. Which technology is used primarily by the banking industry to facilitate check processing? a. OCR b. MICR c. OMR 2. True or False: One disadvantage of digital cameras is the slight delay between when the user presses the button and when the camera takes the photo. 3. A voice input system typically requires software and a(n) __________ in order to input voice data or commands into a computer. Answers: 1) b; 2) True; 3) microphone Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Display Devices Display devices present output visually on some type of screen Monitors are display devices typically used with a desktop computer Display screens are built into a variety of devices Notebook and other portable computers Smartphones and mobile devices Handheld gaming devices, home entertainment devices, kitchen appliances Digital photo frames, e-book readers, smart watches Digital signage systems, digital billboards Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of Display Devices FIGURE 4-25: Uses for display devices. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Display Device Characteristics Color versus monochrome FIGURE 4-26: Flat-panel displays. displays Images are formed using pixels Most displays today are color displays MULTIPLE MONITOR SETUPS Source: Hewlett-Packard C R T versus flat-panel displays Development Company, L.P. Can be used with a single Cathode ray tube (CRT) computer to extend a desktop, SECOND DISPLAY FOR which can increase productivity. PORTABLE COMPUTERS displays: large, bulky, and heavy Can be used to extend the desktop when needed; this curved Flat-panel displays: take up screen has a wider viewing angle than a traditional display. less desk space; use less power Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Size, Aspect Ratio, and Screen Resolution Size and aspect ratio Device size measured diagonally from corner to corner Wide variety of sizes available Most are wide-screen displays (16:9 aspect ratio) Screen resolution The number of pixels used on a display determines its resolution Affects the amount of information that can be displayed on the screen at one time Can be changed to match users’ preference Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Video Adapters, Interfaces, and Ports Video cards determine the graphic FIGURE 4-28: A USB to DisplayPort 4K adapter. capabilities of a computer VGA, DVI, and HDMI are the three most common interfaces to connect monitors to a computer Ports exposed in the system unit cases connect monitors to computers Newer option is to use USB ports Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Example of a Video Card FIGURE 4-27: Video cards. Provide a connection to a monitor, as well as determine video capabilities. Source: NVIDIA Corporation Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Wired, Wireless, and High-Definition Displays Wired versus wireless displays Wired display are physically connected to the system via a cable Wireless displays connect using a wireless network connection (Wi-Fi, Bluetooth) High-definition displays Most common HD format is 1080p Ultra HD (4K) uses about four times as many pixels as 1080p displays Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Wireless Displays FIGURE 4-29: Wireless displays. Display content from a device (such as the smartphone shown here) to the display via a wireless signal.. Source: HTC Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Wearable and Touch Displays Wearable displays project images FIGURE 4-30: Smart glasses. from a mobile device to a display screen Smart glasses Touch and gesture capabilities Kiosks Portable gaming devices Smartphones Tablets Source: Recon Instruments; Vuzix Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Flat Panel Display Technologies Liquid crystal displays (LCDs) use charged liquid crystals between sheets of glass or plastic Requires backlighting Light emitting diode (LED) displays use LCD panels and LED backlighting Organic light emitting diode (OLED) displays use layers of organic material Emit visible light so do not require backlighting More energy efficient Are thinner and have a wider viewing angle Incorporated into many digital cameras, smartphones, T Vs, and other consumer devices Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Organic Light Emitting Diode (OLED) Displays FIGURE 4-31: How OLED displays work. Source: Samsung Electronics Co., Ltd Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of Special Types of OLEDs FIGURE 4-32: Special types of OLEDs. Source: LG Display TRANSPARENT OLEDS FLEXIBLE OLEDS Used to create transparent displays. Used to create flexible displays on plastic or another type of flexible material. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Electronic Paper (E-Paper) Displays Electronic paper (e-paper) displays FIGURE 4-33: How e-paper works. use electronic ink (e-ink) Used for e-readers and other devices Easier to read in direct sunlight Content can change wireless Only uses power to change images, not maintain an image Can be monochrome or color Source: E Ink Corporation a subsidiary of E Ink Holdings, Inc. AN E-READER Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Other Types of Flat Panel Displays Interferometric Modulator (IMOD) FIGURE 4-34: IMOD displays. displays Essentially a complex mirror that uses external light to display images Designed initially for mobile phones and portable devices Images are bright and clear, even in sunlight Plasma displays use layers of gas between two plates of glass Being replaced by LCDs Source: Qualcomm Technologies, Inc. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Data and Multimedia Projectors Data projectors (multimedia projectors) display output from a computer to a wall or projection screen Found in classrooms and conference rooms Can be wireless or integrated into devices Some contain an iPod dock Pico projectors are pocket-size and connect to mobile and portable devices Keyboard projectors project virtual keyboards 3D projectors can project images used with 3D glasses or holograms Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of Data Projectors FIGURE 4-35: Data projectors. Source: Epson America, Inc. Source: Philips Communications Source: Celluon CONVENTIONAL DATA PICO PROJECTORS KEYBOARD PROJECTORS PROJECTORS Are very portable; images from the The projector shown here projects a The projector shown here is ceiling device connected to the projector can virtual keyboard that can be used with mounted and Wi-Fi-enabled. be displayed on any surface. any Bluetooth-compatible device. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Printers Printers produce hard copy Impact printers (dot-matrix) Print mechanism strikes an inked ribbon to transfer ink to the paper Used to produce multipart forms Non-impact printers (ink-jet/laser) Use liquid ink or toner Produce higher quality images Much quieter than impact printers Can be color or black-and-white printers Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Examples of Dot-Matrix and Color Printers FIGURE 4-36: Dot-matrix printers. FIGURE 4-37: Color printing. Requires four colors. Source: InfoPrint Solutions Company Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Printer Characteristics Print resolution Measured in dpi (dots per inch) or images per minute (I PM) More dots per inch results in higher quality output 300 dpi for general purpose printing; 1,200 dpi for photographs; 2,400 dpi for professional applications Print speed Measured in pages per minute (PPM) Range from about 15 to 65 ppm Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Printer Capabilities Personal versus network printers FIGURE 4-39: A multifunction device (MFD). Personal printers connect directly to a single computer Network printers connect directly to a home or an office network; some can perform cloud printing Connection options USB connection, wired network, Wi-Fi, Internet Multifunction devices (M FDs) or all-in-ones Copy, fax, scan, print Source: Epson America, Inc. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Cloud Printing FIGURE 4-38: Cloud printing. Allows you to send documents to a printer via the Internet.. Source: Epson America, Inc. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Laser Printers Laser printers use toner powder and technology similar to that of a photocopier to produce images on paper The standard for business documents Print one entire page at a time Generally faster and have better quality output than ink-jet printers Use toner cartridges; toner is transferred to the paper and fused with heat Color printers use four toner cartridges Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. How Color Laser Printers Work FIGURE 4-40: Laser printers. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Ink-Jet Printers Ink-jet printers spray droplets of ink to produce images on paper Use ink cartridges Usually print in color Often the choice for home use Relatively inexpensive with good-quality output Print more slowly than laser printers Potential applications for the future Dispensing liquid metal, computer chips, “printing” human tissue, silk and protein ink, etc. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. How Ink-Jet Printers Work FIGURE 4-41: How ink-jet printers work. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Special Purpose Printers Barcode printers (print a variety of FIGURE 4-42: RFID printers. barcodes) RFID printers (encode RFID tabs) Label printers (print labels and/or postage) Photo printers Portable printers (used while on the go or by service professionals) Source: Printronix Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Integrated and Large-Format Ink-Jet Printers Integrated printers (built into FIGURE 4-43: Integrated FIGURE 4-44: Large-format printers. printers. Are used to print documents that are a smartphone, digital too large for a standard-sized printer. camera, etc.) Large-format ink-jet printers (print posters, maps, signs, blueprints, etc.) Sometimes called plotters Print up to about 120 inches Source: Polaroid in width Source: Hewlett-Packard Some print on fabric Development Company, L.P. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 3D Printers 3D printers form output in layers to FIGURE 4-45: 3D printers. Can print using a variety of materials (plastic is shown here). build a 3D version of the desired output Can print using plastic, metal, ceramic, wood, glass, sugar, etc. Additive manufacturing Print customized objects on demand Personal products Medical products Prototypes or custom parts Can contain moving parts Issues such as 3D-printed weapons Source: Type A Machines Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Audio Output (1 of 2) Audio output includes voice, music, and other audible sounds Common audio output devices Computer speakers Headphones, headsets, and earbuds Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Audio Output (2 of 2) FIGURE 4-46: Audio output devices. Source: Altec Lansing/AL Infinity, LLC Source: Mova Systems SAS Source: Altec Lansing/AL Infinity, LLC COMPUTER SPEAKERS PORTABLE SPEAKERS EARBUDS Used to output sound from a computer. Connect wirelessly to output sound Used to deliver sound from a from a smartphone or tablet. smartphone or other mobile device to one individual. Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Quick Quiz 3 1. Which display devices takes up the largest amount of room on a desk? a. CRT monitor b. OLED display c. LCD display 2. True or False: Laser printers can only print in black and white. 3. 3D printers typically form output in layers with a process known as __________ manufacturing. Answers: 1) a; 2) False; 3) additive Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Summary Keyboards Pointing and Touch Devices Scanners, Readers, and Digital Cameras Audio Input Display Devices Printers Audio Output Deborah Morley/Charles S. Parker, Understanding Computers: Today and Tomorrow, Comprehensive, 16th Edition. © 2017 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.