TRANSMISSIVE LIQUID CRYSTAL DISPLAY DEVICE
First Claim
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1. A transmissive liquid crystal display device, comprising:
- a liquid crystal panel containing pixels each divided into four subpixels, a red (R), a green (G), a blue (B), and a white (W) subpixel;
a white active backlight emitting light with controllable emission luminance;
a luminance lowering section for performing luminance lowering processing on high luminance pixel data of pixel data contained in input RGB signals representing an input image to transform the input RGB signals to luminance-lowered RGB signals;
an output signal generating section for generating transmittance signals for individual R, G, B, W subpixels in the pixels in the liquid crystal panel from the luminance-lowered RGB signals and also calculating a backlight value for the active backlight from the luminance-lowered RGB signals;
a liquid crystal panel control section for controlling driving of the liquid crystal panel according to the transmittance signals generated in the output signal generating section; and
a backlight control section for controlling the emission luminance of the backlight according to the backlight value calculated in the output signal generating section.
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Abstract
In a transmissive liquid crystal display device including a liquid crystal panel and a backlight, the liquid crystal panel contains pixels each divided into four subpixels, a red (R), a green (G), a blue (B), and a white (W) subpixel. The backlight is a white backlight emitting light with controllable emission luminance. A luminance lowering section performs luminance lowering processing on input RGB signals (original input signals) for transformation into luminance-lowered RGB signals. An output signal generating section obtains transmittances and a backlight value from the luminance-lowered RGB signals.
34 Citations
16 Claims
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1. A transmissive liquid crystal display device, comprising:
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a liquid crystal panel containing pixels each divided into four subpixels, a red (R), a green (G), a blue (B), and a white (W) subpixel; a white active backlight emitting light with controllable emission luminance; a luminance lowering section for performing luminance lowering processing on high luminance pixel data of pixel data contained in input RGB signals representing an input image to transform the input RGB signals to luminance-lowered RGB signals; an output signal generating section for generating transmittance signals for individual R, G, B, W subpixels in the pixels in the liquid crystal panel from the luminance-lowered RGB signals and also calculating a backlight value for the active backlight from the luminance-lowered RGB signals; a liquid crystal panel control section for controlling driving of the liquid crystal panel according to the transmittance signals generated in the output signal generating section; and a backlight control section for controlling the emission luminance of the backlight according to the backlight value calculated in the output signal generating section. - View Dependent Claims (3, 5, 7, 9, 11, 13, 15)
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2. A transmissive liquid crystal display device, comprising:
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a liquid crystal panel containing pixels each divided into four subpixels, a red (R), a green (G), a blue (B), and a white (W) subpixel; a white active backlight emitting light with controllable emission luminance; a chroma lowering section for performing chroma lowering processing on high luminance, high chroma pixel data of pixel data contained in input RGB signals representing an input image to transform the input RGB signals to chroma-lowered RGB signals; a luminance lowering section for performing luminance lowering processing on high luminance pixel data of pixel data contained in the chroma-lowered RGB signals to transform the chroma-lowered RGB signals to chroma/luminance-lowered RGB signals; an output signal generating section for generating transmittance signals for individual R, G, B, W subpixels in the pixels in the liquid crystal panel from the chroma/luminance-lowered RGB signals and also calculating a backlight value for the active backlight from the chroma/luminance-lowered RGB signals; a liquid crystal panel control section for controlling driving of the liquid crystal panel according to the transmittance signals generated in the output signal generating section; and a backlight control section for controlling the emission luminance of the backlight according to the backlight value calculated in the output signal generating section. - View Dependent Claims (4, 6, 8, 10, 12, 14, 16)
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Specification