Liquid crystal display with a backlight source comprising first light source components and second light source components different from the first light source components
A color liquid-crystal display panel has a red filter segment in each red sub-pixel and a blue filter segment in each blue sub-pixel, but no green filter segment in green sub-pixels. The liquid-crystal display panel has a backlight source for illuminating, and the backlight source has green light producing components alternately switched on and off in consecutive frames. The backlight source also has white or red/blue, or purple light emitting components alternately switched on and off in consecutive frames in complementary phase to the green light producing components. When the liquid crystal layer segments associated with all the three color sub-pixels are operated in a light non-blocking state, only the white or red/blue light producing components are turned on, and when the liquid crystal layer segments associated with the red sub-pixels are operated in a light blocking state, only the green light producing components are turned on.
1. A color liquid-crystal display comprising a plurality of pixels, at least some of the pixels comprising color sub-pixels, the color sub-pixels comprising first sub-pixels, second sub-pixels and third sub-pixels, said liquid-crystal display further comprising:
a color filter comprising a red filter segment configured for color filtering in each first sub-pixel, and a blue filter segment configured for color filtering in each third sub-pixel;
a liquid crystal layer comprising a plurality of liquid crystal layer segments associated with the color sub-pixels, each liquid crystal layer segment operable in a first state and in a second state; and
a backlight source for illuminating the liquid-crystal display through the liquid crystal layer and the color filter, said backlight source comprising a plurality of first light source components and a plurality of second light source components different from the first light source components, such that when the liquid crystal layer segments associated with the first sub-pixels, the second sub-pixels and the third sub-pixels are operated in the first state, the first light source components are turned on for said illuminating; and
when the liquid crystal layer segments associated with the second sub-pixels and the third sub-pixels are operated in the first state, and the liquid crystal layer segments associated with the first sub-pixels are operated in the second state, the second light source components are turned on for said illuminating.
2. The display of claim 1 , wherein the first light source components comprise white light emitting components, and the second light source components comprise green emitting components.
3. The display of claim 1 , wherein the first light source components comprise red light emitting components and blue light emitting components, and the second light source components comprise green light emitting components.
4. The display of claim 1 , wherein the first light source components comprise blue light emitting components to produce blue light and materials excitable by the blue light for producing red light, and the second light source components comprise green light emitting components.
5. The display of claim 1 , wherein the first sub-pixels are alternately operated in the first state and in the second state in consecutive frames in a predetermined frequency greater than or substantially equal to 60 Hz, and wherein the first light source components and the second light source components are alternately turned on for said illuminating in said predetermined frequency.
6. The display of claim 1 , wherein light from the second light source is partially blocked by the blue filter when the third sub-pixels are operated in the first state.
7. The display of claim 1 , wherein the liquid crystal layer comprises a plurality of liquid crystal molecules operable in a light blocking state and a light non-blocking state, and when the liquid crystal layer segments are operated in the first state, the liquid crystal molecules are operated in the light non-blocking state, and when the liquid crystal layer segments are operated in the second state, the liquid crystal molecules are operated in the light-blocking state.
8. The display of claim 1 , wherein when the liquid crystal molecules are operated in the light non-blocking state, the liquid crystal molecules are caused to align along an axis substantially perpendicular to the liquid crystal layer.
9. A method for operating a liquid crystal display panel and a backlight source, the liquid crystal display panel comprising:
a liquid crystal layer,
a color filter, and
a plurality of pixels, at least some of the pixels comprising color sub-pixels, wherein the color sub-pixels comprise first sub-pixels, second sub-pixels and third sub-pixels, and wherein the liquid layer comprises a plurality of liquid crystal layer segments associated with the color sub-pixels, each liquid crystal layer segment operable in a first state and in a second state, and wherein the backlight source is arranged for illuminating the liquid-crystal display through the liquid crystal layer and the color filter, the backlight source comprising a plurality of first light source components and a plurality of second light source components different from the first light source components, said method comprising:
arranging in the color filter a red filter segment for color filtering each first sub-pixel and a blue filter for color filtering each third sub-pixel;
operating the backlight source such that
when the liquid crystal layer segments associated with the first sub-pixels, the second sub-pixels and the third sub-pixels are operated in the first state, the first light source components are turned on for said illuminating; and
when the liquid crystal layer segments associated with the second sub-pixels and the third sub-pixels are operated in the first state, and the liquid crystal layer segments associated with the first sub-pixels are operated in the second state, the second light source components are turned on for said illuminating.
10. The method of claim 9 , wherein the first light source components comprise white light emitting components, and the second light source components comprise green emitting components.
11. The method of claim 9 , wherein the first light source components comprise red light emitting components and blue light emitting components, and the second light source components comprise green light emitting components.
12. The method of claim 9 , wherein the first light source components comprise blue light emitting components to produce blue light and materials excitable by the blue light for producing red light, and the second light source components comprise green light emitting components.
13. The method of claim 9 , wherein the first sub-pixels are alternately operated in the first state and in the second state in consecutive frames in a predetermined frequency greater than or substantially equal to 60 Hz, and wherein the first light source components and the second light source components are alternately turned on for said illuminating in said predetermined frequency.
14. The method of claim 9 , wherein the liquid crystal layer comprises a plurality of liquid crystal molecules operable in a light blocking state and a light non-blocking state, and when the liquid crystal layer segments are operated in the first state, the liquid crystal molecules are operated in the light non-blocking state, and when the liquid crystal layer segments are operated in the second state, the liquid crystal molecules are operated in the light-blocking state.
15. The method of claim 14 , wherein when the liquid crystal molecules are operated in the light non-blocking state, the liquid crystal molecules are caused to align along an axis substantially perpendicular to the liquid crystal layer.
16. A backlight source configured for illuminating a color liquid-crystal display, the liquid crystal display panel comprising:
a liquid crystal layer,
a color filter, and
a plurality of pixels, at least some of the pixels comprising color sub-pixels, wherein the color sub-pixels comprise first sub-pixels, second sub-pixels and third sub-pixels, and wherein the liquid layer comprises a plurality of liquid crystal layer segments associated with the color sub-pixels, each liquid crystal layer segment operable in a first state and in a second state, and wherein the color filter comprising a red filter segment configured for color filtering in each first sub-pixel, and a blue filter segment configured for color filtering in each third sub-pixel, said backlight source comprising:
a plurality of first light source components; and
a plurality of second light source components different from the first light source components, wherein the first light source components are configured to be turned on for said illuminating only when the liquid crystal layer segments associated with the first sub-pixels, the second sub-pixels and the third sub-pixels are operated in the first state, and the second light source components are configured to be turned on for said illuminating only when the liquid crystal layer segments associated with the second sub-pixels and the third sub-pixels are operated in the first state, and the liquid crystal layer segments associated with the first sub-pixels are operated in the second state.
17. The backlight source of claim 16 , wherein the first light source components comprise white light emitting components, and the second light source components comprise green emitting components.
18. The backlight source of claim 17 , wherein the white light emitting components comprise white light emitting diodes and the green emitting components comprise green emitting diodes.
19. The backlight source of claim 17 , wherein the white light emitting components comprise red light emitting diodes, green light emitting diodes and blue light emitting diodes, and the green emitting components comprise green emitting diodes.
20. The backlight source of claim 16 , wherein the first light source components comprise red light emitting components and blue light emitting components, and the second light source components comprise green light emitting components.
21. The backlight source of claim 20 , wherein the red light emitting components comprise red light emitting diodes, the blue light emitting components comprise blue light emitting diodes, and the green emitting components comprise green emitting diodes.
22. The backlight source of claim 16 , wherein the first light source components comprise purple light emitting components, and the second light source components comprise green light emitting components.
23. The backlight source of claim 22 , wherein the purple light emitting components comprises blue light emitting components to produce blue light and material excitable by the blue light for producing red light.
24. The backlight source of claim 16 , wherein the first sub-pixels are alternately operated in the first state and in the second state in consecutive frames in a predetermined frequency greater than or substantially equal to 60 Hz, and wherein the first light source components and the second light source components are alternately turned on for said illuminating in said predetermined frequency.
25. The display of claim 1 , wherein the color filter further comprises a clear segment on each second sub-pixel.
26. The method of claim 9 , wherein the first light source components and the second light source components are alternately turned on in consecutive frames for an equal period in a frame for said illuminating.