Field sequential LCD device and color image display method thereof
First Claim
Patent Images
1. A field sequential liquid crystal display device, comprising:
- a liquid crystal panel having an upper substrate, a lower substrate and a liquid crystal layer therebetween;
a backlight device under the liquid crystal panel for irradiating light to the liquid crystal panel and having three color light sources; and
an image signal processor controlling a sequential lighting order and combination of the three color light sources.
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Abstract
In a liquid crystal display device, a field sequential liquid crystal display device includes a liquid crystal panel having an upper substrate, a lower substrate and a liquid crystal layer therebetween; a backlight device under the liquid crystal panel for irradiating light to the liquid crystal panel and having three color light sources; and an image signal processor controlling a sequential lighting order and combination of the three color light sources.
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Citations
22 Claims
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1. A field sequential liquid crystal display device, comprising:
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a liquid crystal panel having an upper substrate, a lower substrate and a liquid crystal layer therebetween;
a backlight device under the liquid crystal panel for irradiating light to the liquid crystal panel and having three color light sources; and
an image signal processor controlling a sequential lighting order and combination of the three color light sources. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A color image display method for a field sequential liquid crystal display device that includes a liquid crystal panel having an upper substrate, a lower substrate, a liquid crystal layer therebetween, and a plurality of pixels;
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a backlight device under the liquid crystal panel for irradiating light to the liquid crystal panel and having Red, Green and Blue light sources; and
an image signal processor controlling a sequential lighting order and combination of the Red, Green and Blue light sources, the method comprising the steps of;
dividing one frame into first, second and third subframes, wherein each subframe has a period of approximately one-third of one frame period;
applying an image signal to each pixel of the liquid crystal panel through the image signal processor, the image signal depending on image characteristics displayed in the liquid crystal panel; and
lighting the Red, Green and Blue light sources at the subframes through the image signal processor by way of combining the lighting order of the Red, Green and Blue light sources. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22)
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17. A color image display method for a field sequential liquid crystal display device that includes a liquid crystal panel having an upper substrate, a lower substrate, a liquid crystal layer therebetween, and a plurality of pixels;
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a backlight device under the liquid crystal panel for irradiating light to the liquid crystal panel and having Red (R), Green (G) and Blue (B) light sources; and
an image signal processor controlling an image signal and a sequential lighting order and combination of the Red, Green and Blue light sources, the method comprising the steps of;
expressing a brightness of each component R, G and B with a gray level having 256 levels;
setting the brightness of each component R, G and B as a maximum brightness when the brightness of each component R, G and B has a value of gray level of at least 127;
calculating the average brightness value of each of the components R, G and B;
classifying cases in accordance with the image signal by which the average brightness values of the components R, G and B is greater than the maximum brightness of the displayed image; and
determining which light sources are turned on at the subframes in each case.
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Specification