Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1998-04-16
2000-11-21
Chow, Dennis-Doon
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 50, 345102, G09G 336
Patent
active
061510041
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a field-sequential type color display system wherein a field is composed of a plurality of sub-fields and images in different colors are displayed in each of the sub-fields so that multicolor display is effected by mixing colors while taking advantage of the effect of image synthesis along the time base by human eyes.
BACKGROUND TECHNOLOGY
One type of field-sequential type color display system comprises a display unit for emitting light rays having wavelengths in a wideband, capable of supplying display information by the light rays of varying wavelengths for respective sub-fields and a variable filter unit for selecting light rays in specific wavelength regions for the respective sub-fields among the light rays having wavelengths in the wideband.
Another type of field-sequential type color display system comprises a light source unit capable of emitting light rays of different wavelengths, and a shutter unit for controlling the light rays emitted by the light source unit on the basis of display information, wherein the light source unit is caused to emit light rays in specific colors for the respective sub-fields while controlling the shutter unit in correspondence thereto.
For a color light source, a fluorescent lamp, or a light emitting diode (LED) has been used. In particular, as a result of the recent development of LEDs emitting blue light, it has become feasible to fabricate the field sequential type color display system by combining LEDs emitting light in the three primary colors.
An example of the field sequential type color display system is shown in FIG. 15.
The field-sequential type color display system is provided with a light source unit 1 composed of a plurality of color light sources which emit light rays of various wavelengths, which can be controlled independently of one another. That is, the light source unit 1 comprises a LED box 3 wherein light emitting diodes (LEDs) 4 for emitting three colors, red, green, and blue, respectively, are arranged as the color light sources, and a diffusion plate 5, and it is driven by a light source driving circuit 8.
The field-sequential type color display system is also provided with a liquid crystal shutter unit 2, operated by the agency of liquid crystal elements, as a shutter unit for controlling the transmittivity of the light rays emitted by the light source unit 1. The liquid crystal shutter unit 2 comprises display segments 6, capable of displaying characters and numbers. And the liquid crystal shutter unit 2 is driven by a shutter control circuit 9.
The shutter control circuit 9 and the light source driving circuit 8 are synchronously controlled by a synchronous circuit 10 so as to be driven in synchronization with each other.
A block diagram of the field-sequential type color display system in FIG. 15 is shown in FIG. 16.
The light source unit 1 consists of a red light source R, a green light source G, and a blue light source B composed of LEDs 4 for three colors, which are energized by a red light source signal Lr, a green light source signal Lg, and a blue light source signal Lb, respectively, supplied from the light source driving circuit 8.
The liquid crystal shutter unit 2 is driven by data signals D and a common signal C respectively supplied from the shutter control circuit 9. Timing pulses of each signal are generated in a synchronous circuit 10 for controlling phases of each light source signal and a liquid crystal shutter driving signal in the same manner.
FIG. 17 is a waveform chart showing waveforms of respective signals in the field sequential type color display system shown in FIG. 16 and optical response characteristic of the liquid crystal shutter unit 2 at the driving voltage of 20V for driving the liquid crystal shutter at room temperature.
In this example, for driving the liquid crystal shutter unit 2 by AC, two fields, f1 and f2, are in use and each of the fields consists of three sub-fields, fR, fG, and fB.
As shown in FIG. 17, the red light source signal Lr turns on only
REFERENCES:
patent: 5233338 (1993-08-01), Surguy
Chow Dennis-Doon
Citizen Watch Co. Ltd.
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