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US 8,570,316 B2Granted
Liquid crystal display
AssigneeLG Display Co., Ltd.
InventorsJiyoung Ahn, Dongwoo Kang
Life of this patent
Estimating the term…
Abstract
A liquid crystal display converts white luminance Y of data displaying a white background into a value satisfying a certain equation upon detecting a brightness contrast image including a pure color image with the white background.
Claims8
A liquid crystal display, comprising:
- an RGBW panel having a plurality of data lines, a plurality of gate lines crossing the data lines, a plurality of TFTs connected to crossings between the data lines and the gate lines, and an RGBW pixel structure;
- an image conversion unit for converting white luminance Y of data displaying a white background into a value satisfying any one of the following equations upon detecting a brightness contrast image including a pure color image corresponding to any one of a yellow, a cyan, and a magenta image with the white background;
- a data driving circuit for converting digital data converted by the image conversion unit into positive/negative analog data voltages;
- and
- a gate driving circuit for supplying gate pulses to the gate lines,
- wherein the image conversion unit includes a chromatic analysis part for calculating the luminance of yellow data, cyan data, or magenta data after analyzing pixel data of input RGB digital video data, and determining the pixel data as the yellow data, the cyan data, or the magenta data,
- the equations including:
- Y
-
- (
- white
- )
- =
- Yref
-
- (
- white
- )
- ×
- MIN
-
- {
- Y
-
- (
- yellow
- )
- Yref
-
- (
- yellow
- )
- ,
- Y
-
- (
- cyan
- )
- Yref
-
- (
- cyan
- )
- ,
- Y
-
- (
- magenta
- )
- Yref
-
- (
- magenta
- )
- }
- ,
-
- Y
-
- (
- white
- )
- =
- Yref
-
- (
- white
- )
- ×
- Y
-
- (
- yellow
- )
- Yref
-
- (
- yellow
- )
- ,
- and
- Y
-
- (
- white
- )
- =
- Y
-
- (
- yellow
- )
- wherein Y(X) is a luminance value of color X, Yref(X) is a luminance value of color X of a reference display device having an RGB pixel structure, and MIN Y(X, Y, Z) is the minimum luminance value among X, Y, and Z.
90 more elements
A liquid crystal display, comprising:
- an RGBW panel having a plurality of data lines, a plurality of gate lines crossing the data lines, a plurality of TFTs connected to crossings between the data lines and the gate lines, and an RGBW pixel structure;
- an image conversion unit for converting one or more of R subpixel data, G subpixel data, B subpixel data, and W subpixel data displaying a pure color image into a value higher than an input value upon detecting a brightness contrast image including a pure color image with a white background;
- a data driving circuit for converting digital data converted by the image conversion unit into positive/negative analog data voltages;
- and
- a gate driving circuit for supplying gate pulses to the gate lines,
- wherein the image conversion unit equalizes the white luminance displaying the white background regardless of a gray scale change when the image having brightness contrast is detected, and increases the white luminance in proportion to a gray scale value when images other than the image having brightness contrast are detected.
3 more elements
Dependencies are inferred from the claim text.