Liquid crystal display
View Patent ↗In a liquid crystal display (LCD), a division point memory stores positional information about pixel division points that regularly divide X pixels and Y pixels on a display screen into sections. A gradation correction value memory stores gradation correction values that are prepared for the pixel division points and gradation division points, respectively, the gradation division points regularly dividing a maximum gradation level characteristic to the LCD into sections. A gradation level determination unit generates gradation level interpolation signals for pixel division points related to an input image signal according to the gradation correction values stored in the gradation correction value memory. A horizontal interpolation unit finds x-axis distances between a pixel position of the input image signal and positions of the pixel division points, and according to the found x-axis distances and the gradation level interpolation signals, generates horizontal interpolation signals. A vertical interpolation unit finds y-axis distances between the pixel position of the input image signal and the positions of the pixel division points, and according to the found y-axis distances and the horizontal interpolation signals, generates an image signal to be displayed on the LCD.
1. A liquid crystal display having a first substrate provided with display pixels arrayed in a matrix of X pixels along a first side of the first substrate and Y pixels along a second side of the first substrate, a second substrate arranged in parallel with the first substrate, and liquid crystals sealed between the first and second substrates, a voltage being applied between the first and second substrates to display an image, the liquid crystal display comprising:
a division point memory that stores positional information about pixel division points that regularly divide the X pixels into “M−1” (1≦M≦X) sections and the Y pixels into “N−1” (1≦N≦Y) sections;
a gradation correction value memory that stores, for each of the pixel division points, gradation correction values that are prepared in advance according to special test signals for gradation division points, respectively, which regularly divide a maximum gradation level characteristic to the liquid crystal display into sections;
a gradation level determination unit configured to generate gradation level interpolation signals for pixel division points related to an input image signal according to the gradation correction values stored in the gradation correction value memory;
a horizontal interpolation unit configured to find x-axis distances between a pixel position of the input image signal and positions of the pixel division points, and according to the found x-axis distances and the gradation level interpolation signals, generate horizontal interpolation signals; and
a vertical interpolation unit configured to find y-axis distances between the pixel position of the input image signal and the positions of the pixel division points, and according to the found y-axis distances and the horizontal interpolation signals, generate an image signal to be displayed on the liquid crystal display.
2. The liquid crystal display according to claim 1 , wherein:
the gradation level determination unit conducts linear interpolation with the use of adjacent two of the gradation division points.
3. A liquid crystal display having a first substrate provided with display pixels arrayed in a matrix of X pixels along a first side of the first substrate and Y pixels along a second side of the first substrate, a second substrate arranged in parallel with the first substrate, and liquid crystals sealed between the first and second substrates, a voltage being applied between the first and second substrates to display an image, the liquid crystal display comprising:
a division point memory that stores positional information about pixel division points that regularly divide the X pixels into “M−1” (1≦M≦X) sections and the Y pixels into “N−1” (1≦N≦Y) sections;
a gradation correction value memory that stores, for each of the pixel division points, gradation correction values that are prepared in advance according to special test signals for gradation division points, respectively, which irregularly divide a maximum gradation level characteristic to the liquid crystal display into sections;
a gradation level determination unit configured to generate gradation level interpolation signals for pixel division points related to an input image signal according to the gradation correction values stored in the gradation correction value memory;
a horizontal interpolation unit configured to find x-axis distances between a pixel position of the input image signal and positions of the pixel division points, and according to the found x-axis distances and the gradation level interpolation signals, generate horizontal interpolation signals; and
a vertical interpolation unit configured to find y-axis distances between the pixel position of the input image signal and the positions of the pixel division points, and according to the found y-axis distances and the horizontal interpolation signals, generate an image signal to be displayed on the liquid crystal display.
4. The liquid crystal display according to claim 3 , wherein:
the gradation level determination unit conducts linear interpolation with the use of adjacent two of the gradation division points.