DISPLAY DEVICE AND DISPLAY METHOD THEREFOR
First Claim
1. A display device having a function of controlling a backlight luminance, comprising:
- a display panel for displaying an image on the basis of external video data, having each pixel being composed of subpixels of four or more colors;
a backlight including light sources whose luminances are controllable;
a luminance adjustment portion for, when a tone value exceeding a predetermined limit is to be provided to any subpixel of a specific color among all pixels included in the display panel, decreasing tone values to be provided to all subpixels of the specific color to a predetermined limit or less and correspondingly decreasing tone values to be provided to all subpixels of the other colors; and
a lighting control portion for controlling the luminances of the light sources to increase, thereby compensating for a display luminance reduction of the subpixels due to the tone values being decreased.
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Abstract
In the present display device with each pixel being composed of subpixels of four or more colors, a backlight data processing portion sets a backlight source luminance to be high enough to compensate for a display luminance reduction caused by a maximum luminance adjustment portion (332) multiplying input pixel data for G by an adjustment gain, such that the value of the input pixel data for G does not exceed the maximum pixel value, after a G correction portion (331) corrects the input pixel data for G to compensate for a display luminance reduction due to the area of (subpixel) G being half of others. Thus, it is possible to realize high color reproducibility and a high luminance as realized by conventional liquid crystal display devices with a three-color, RGB, pixel configuration.
22 Citations
9 Claims
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1. A display device having a function of controlling a backlight luminance, comprising:
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a display panel for displaying an image on the basis of external video data, having each pixel being composed of subpixels of four or more colors; a backlight including light sources whose luminances are controllable; a luminance adjustment portion for, when a tone value exceeding a predetermined limit is to be provided to any subpixel of a specific color among all pixels included in the display panel, decreasing tone values to be provided to all subpixels of the specific color to a predetermined limit or less and correspondingly decreasing tone values to be provided to all subpixels of the other colors; and a lighting control portion for controlling the luminances of the light sources to increase, thereby compensating for a display luminance reduction of the subpixels due to the tone values being decreased. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A display method for a display device having a function of controlling a luminance of a backlight, the method comprising:
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a luminance adjustment step of, when a tone value exceeding a predetermined limit is to be provided to any subpixel of a specific color among all pixels included in a display panel, decreasing tone values to be provided to all subpixels of the specific color to a predetermined limit or less and correspondingly decreasing tone values to be provided to all subpixels of the other colors, wherein the display panel has pixels each being composed of subpixels of four or more colors, and displays an image on the basis of external video data; and a lighting control step of controlling luminances of light sources included in the backlight to increase, thereby compensating for a display luminance reduction of the subpixels due to the tone values being decreased.
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Specification