Chapter Four Display Devices © Wiley Inc. 2015. All Rights Reserved.

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Chapter Four Display Devices © Wiley Inc. 2015. All Rights Reserved.

220-901 Domain 1.0 Objectives Covered 1.10 Given a scenario, evaluate types and features of display devices. Types: LCD: TN vs. IPS Fluorescent vs. LED backlighting Plasma Projector OLED Refresh/frame rates Resolution Native resolution Brightness/lumens Analog vs. digital Privacy/antiglare filters Multiple displays Aspect ratios: 16:9 16:10 4:3 © Wiley Inc. 2015. All Rights Reserved.

Video Display Types Liquid crystal display Plasma OLED Projection systems © Wiley Inc. 2015. All Rights Reserved.

LCD Panel Construction Twisted nematic (TN) In-plane switching (IPS) © Wiley Inc. 2015. All Rights Reserved.

TN vs. IPS © Wiley Inc. 2015. All Rights Reserved.

LCD Display Pixel Addressing Active matrix Passive matrix Dual scan © Wiley Inc. 2015. All Rights Reserved.

LCD Backlight Sources Fluorescent bulb(s) - legacy LEDs Approaches infinite contrast ratio No need for inverter boards © Wiley Inc. 2015. All Rights Reserved.

Plasma Displays Cells filled with a cloud of charged particles Burn-in possible Refresh rates of 600Hz but with no “soap-opera effect” © Wiley Inc. 2015. All Rights Reserved.

OLED Displays LEDs are used for color production. Displays can be made flexible. AMOLED or PMOLED Naturally less energy-efficient to display white pixels Super AMOLED and Super AMOLED Plus add on-cell TSP © Wiley Inc. 2015. All Rights Reserved.

Projection Systems Cast a lighted image on a screen. Front or rear projection Brightness measured in lumens and can be a major selling point Metal halide bulbs are expensive Allow time to cool down before unplugging projectors. © Wiley Inc. 2015. All Rights Reserved.

Adjusting Display Settings Refresh rate Frame rate Resolution Multiple displays © Wiley Inc. 2015. All Rights Reserved.

Calculation of Required Video Memory horizontal pixels × vertical pixels = pixels/screen pixels/screen × bits/pixel = bits/screen bits/screen ÷ 8 bits/byte = bytes/screen Divide by 1024 successively for KB, MB, etc. Ex: How much memory is required for a resolution of 1024 × 768 and a 24-bit color depth? 1024 horizontal pixels × 768 vertical pixels = 786,432 pixels/screen 786,432 pixels/screen × 24 bits/pixel = 18,874,368 bits/screen 18,874,368 bits/screen ÷ 8 bits/byte = 2,359,296 bytes/screen © Wiley Inc. 2015. All Rights Reserved.

Video Standards Legacy digital Analog Modern digital Monochrome CGA VGA Modern digital DVI HDMI © Wiley Inc. 2015. All Rights Reserved.

Video Resolutions Is this slide clear enough? © Wiley Inc. 2015. All Rights Reserved.

Nonadjustable Characteristics Native resolution Contrast ratio © Wiley Inc. 2015. All Rights Reserved.