1. Chapter Four
Display Devices
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2. 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
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3. Video Display Types Liquid crystal display Plasma OLED
Projection systems
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4. LCD Panel Construction
Twisted nematic (TN)
In-plane switching (IPS)
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5. TN vs. IPS
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6. LCD Display Pixel Addressing
Active matrix
Passive matrix
Dual scan
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7. LCD Backlight Sources Fluorescent bulb(s) - legacy LEDs
Approaches infinite contrast ratio
No need for inverter boards
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8. Plasma Displays Cells filled with a cloud of charged particles
Burn-in possible
Refresh rates of 600Hz but with no “soap-opera effect”
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9. 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
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10. 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.
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11. Adjusting Display Settings
Refresh rate
Frame rate
Resolution
Multiple displays
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12. 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
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13. Video Standards Legacy digital Analog Modern digital Monochrome CGA
VGA
Modern digital
DVI
HDMI
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14. Video Resolutions Is this slide clear enough?
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15. Nonadjustable Characteristics
Native resolution
Contrast ratio
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