Mechanism to mitigate color breakup artifacts in field sequential color display systems
View Patent ↗A system and method for displaying video images in response to each frame of field-sequential video signals. The system comprises a backlight comprising first, second and third primary color light sources. The backlight is operable to emit light for at most 5.67 milliseconds of each frame (on-time), and to emit no light during the remainder of each frame (off-time). During a portion of the on-time, at least two of the primary color light sources are on simultaneously. For another portion of the on-time, the primary color light sources are on sequentially.
1. A system for displaying video images in response to each frame of field-sequential video signals, the system comprising:
a backlight comprising a first primary color light source, a second primary color light source, and a third primary color light source,
the backlight being operable to emit light for at most 5.56 milliseconds of each frame (on-time), and to emit no light during the remainder of each frame (off-time), wherein:
during a portion of the on-time, at least two of the primary color light sources are on simultaneously, and for another portion of the on-time, the primary color light sources are on sequentially.
2. The system of claim 1 , wherein the system is a projection-based field sequential color-based display system.
3. The system of claim 1 , wherein the system is a direct-view field sequential color-based display system.
4. The system of claim 1 , wherein at least two of the primary color light sources are cycled synchronously at fixed intervals regardless of program content.
5. The system of claim 1 , wherein at least two of the primary color light sources are cycled asynchronously during each frame according to program content.
6. The system of claim 1 wherein the primary color light sources are independently controlled.
7. The system of claim 1 , further comprising means for modulating the light of each primary color light source in at least one of intensity and pulse width.
8. A method for displaying video images in response to each frame of field-sequential video signals, the method comprising:
outputting light from three primary color light sources for at most 5.56 milliseconds during each frame of the video signals (on-time), and outputting no light during the remainder of each frame (off-time), wherein:
during a portion of the on-time, at least two of the primary color light sources are outputting light simultaneously, and for another portion of the on-time, the primary color light sources are outputting light sequentially.
9. The method of claim 8 , further comprising:
modulating the light of each primary color light source in at least one of intensity and pulse width.
10. The method of claim 9 , further comprising:
generating gray scale.
11. The method of claim 10 , wherein the generating comprises modulating the width of a light pulse.
12. The method of claim 10 , wherein the generating comprises modulating the intensity of the light.
13. The method of claim 8 , further comprising:
outputting the light of at least two of the primary color light sources at fixed intervals regardless of program content.
14. The method of claim 8 , further comprising:
asynchronously outputting the light of at least two of the primary color light sources during each frame according to program content.
15. The method of claim 8 , further comprising:
independently controlling the light of each of the primary color light sources.