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EspañolCOMPARISON OF DISPLAY TECHNOLOGY
This is a comparison of various properties of different display technologies.
Different display technologies have vastly different temporal characteristics, leading to claimed perceptual differences for motion, flicker etc.
The figure shows a sketch of how different technologies present a single white/gray frame. Time and intensity is not to scale. Notice that some have a fixed intensity, while the illuminated period is variable. This is a kind of pulse-width modulation. Others can vary the actual intensity in response to the input signal.
DLPs use a kind of "chromatic multiplex" in which each color is presented serially. The intensity is varied by modulating the "on" time of each pixel within the time-span of one color.
LCDs have a constant (backlit) image, where the intensity is varied by blocking the light shining through the panel.
CRTs use an electron beam, scanning the display, flashing a lit image. If interlacing is used, a single full-resolution image results in two "flashes".
Plasma displays modulate the "on" time of each sub-pixel, similar to DLP.
Movie theaters use a mechanical shutter to "flash" the same frame 2 or 3 times, increasing the flicker frequency to make it less perceptible to the human eye.
★ Large-screen television technology
| Contents |
| General characteristics |
| Temporal characteristics |
| See also |
| References |
General characteristics
| Shape of Screen | diagonal screen size | Typical Use | Usable in bright room | ||
|---|---|---|---|---|---|
| (in) | (cm) | ||||
| Eidophor Front Projection | Flat | by brightness) | TV | ||
| Shadow mask CRT | Spherical curve or flat | | | Computer monitor, TV | |
| Aperture grille CRT | Cylindrical curve or flat | | | Computer monitor, TV | |
| Direct view Charactron CRT | Spherical curve | | | Computer monitor, Radar display | |
| CRT Self-contained Rear Projection | Flat lenticular | | | TV | |
| CRT Front Projection | Flat | by brightness) | TV or presentation | ||
| PDP (Plasma Display Panel) | Flat | | | TV | |
| Direct View LCD | Flat | | | Computer monitor, TV | |
| LCD Self-contained Rear Projection | Flat lenticular | | | TV | |
| LCD Front Projection | Flat | by brightness) | TV or presentation | ||
| DLP Self-contained Rear Projection | Flat lenticular | | | TV | |
| DLP Front Projection | Flat | by brightness) | TV or presentation | ||
| D-ILA Self-contained Rear Projection | Flat | | | TV | |
| LCoS Self-contained Rear Projection | Flat | | | TV | |
| LCoS Front Projection | Flat | by brightness) | TV or presentation | ||
| SED | Flat | | | Computer monitor, TV | |
| FED | Flat | | | Computer monitor, TV | |
| EPD | Flat (flexible) | | | Electronic paper | |
| OLED | Flat | | | Computer monitor, TV | |
| IMOD | Flat | | | Mobile phone IMOD | |
| Virtual retinal display | Any shape | Experimental, possibly virtual reality | Depends on system | ||
Temporal characteristics
Different display technologies have vastly different temporal characteristics, leading to claimed perceptual differences for motion, flicker etc.
Sketch of some common display technologies' temporal behaviour
The figure shows a sketch of how different technologies present a single white/gray frame. Time and intensity is not to scale. Notice that some have a fixed intensity, while the illuminated period is variable. This is a kind of pulse-width modulation. Others can vary the actual intensity in response to the input signal.
DLPs use a kind of "chromatic multiplex" in which each color is presented serially. The intensity is varied by modulating the "on" time of each pixel within the time-span of one color.
LCDs have a constant (backlit) image, where the intensity is varied by blocking the light shining through the panel.
CRTs use an electron beam, scanning the display, flashing a lit image. If interlacing is used, a single full-resolution image results in two "flashes".
Plasma displays modulate the "on" time of each sub-pixel, similar to DLP.
Movie theaters use a mechanical shutter to "flash" the same frame 2 or 3 times, increasing the flicker frequency to make it less perceptible to the human eye.
See also
★ Large-screen television technology
References
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