Sharp Kabushiki Kaisha Corporation

Tomohiko Mori

Kazunari Tomizawa

Yuichi Yoshida

Shun Ueki

Makoto Hasegawa

Kozo Nakamura

Kohzoh Nakamura

Isamu Miyake

Takao Muroi

Iichiroh Inoue

Makoto Shiomi

Shinji Horino

Image display control by which effective correction is performed even for a biased change in a source potential for one frame in a liquid crystal display device is achieved. A liquid crystal display device () includes a correction unit that corrects a source voltage value to a pixel. The correction unit calculates a correction amount by using an integrated value of a source potential for previous one frame instead of an integrated value of the source potential for next one frame. The liquid crystal display device () applies the source voltage based on the correction amount to the pixel.

Display control device, liquid crystal display device, and television receiver

A liquid crystal display device according to the present invention has a display area that includes a plurality of pixels (Px). The display area is made up of n kinds of domains (where n is an integer that is equal to or greater than two and equal to or smaller than four). The directors of the n kinds of domains define mutually different alignment directions. If the domain structure of each pixel (Px) is defined by the kinds of the domains that form the pixel (Px), the number k of the kinds of the domains that form the pixel (Px), and the arrangement of the domains in the pixel (Px), the display area includes a pixel, of which k is less than n and of which the domain structure is different from the domain structures of adjacent pixels.

Liquid crystal display device

A multi-primary color display device () includes: a multi-primary color display panel () including a pixel that is defined by a plurality of sub pixels including a red sub pixel (R), a green sub pixel (G), a blue sub pixel (B), and a yellow sub pixel (Ye); and a signal converting circuit () converting a three-primary color image signal corresponding to three primary colors into a multi-primary color image signal corresponding to four or more primary colors. The signal converting circuit (), in a case where a three-primary color image signal representing at least an achromatic color of a half tone is input, performs a signal conversion such that variations in luminance levels of the plurality of sub pixels are equalized.

Multi-primary color display device

A display device is disclosed, along with a display method capable of displaying an input image having a resolution higher than the resolution of a display panel without degradation in display quality. The display device is a display device for displaying an image with each frame divided into two sub-frames. In the display device, a bright sub-pixel and a dark sub-pixel in each pixel are interchanged every sub-frame, and an input signal has a vertical resolution twice that of a display panel. The display device displays an image corresponding to the input signal by making the sub-frames different from each other in a voltage supplied to each pixel.

Display device and display method

The liquid crystal display device () of the present invention includes a liquid crystal panel () having a plurality of pixels (P), and a backlight () having at least one light source () that emits light to the liquid crystal panel (). Each of the plurality of pixels (P) includes four or more sub-pixels (R, G, B, Ye), and the light source unit () includes a red light source (R), a green light source (G), and a blue light source (B). According to the present invention, a liquid crystal display device which can perform display of wide color reproduction range with low power consumption is provided.

The viewing angle characteristics of a multiprimary liquid crystal display device in which a plurality of red subpixels are provided in each pixel are improved. A multiprimary liquid crystal display device according to the present invention includes a pixel defined by a plurality of subpixels, and performs multicolor display by using four or more primary colors to be displayed by the plurality of subpixels. The plurality of subpixels of the multiprimary liquid crystal display device according to the present invention include first and second red subpixels Rand Rfor displaying red, a green subpixel G for displaying green, a blue subpixel B for displaying blue, and a cyan subpixel C for displaying cyan. When a color having a hue which is within a predetermined first range is displayed by the pixel, the gray scale level of the first red subpixel Rand the gray scale level of the second red subpixel Rdiffer from each other. When a color having a hue which is within a second range different from the first range is displayed by the pixel, the gray scale level of the first red subpixel Rand the gray scale level of the second red subpixel Rare equal.

Multiple primary color liquid crystal display device and signal conversion circuit

A display device () according to the present invention includes a pixel defined by a plurality of sub pixels. The plurality of sub pixels are a red sub pixel (R) to display red, a green sub pixel (G) to display green, a blue sub pixel (B) to display blue, and a yellow sub pixel (Ye) to display yellow. When an input signal corresponding to green of the sRGB color space is externally input, the display device () according to the present invention provides display by use of the green sub pixel (G) and also the yellow sub pixel (Ye). According to the present invention, a multiple primary color display device which suppresses decline of the display quality when an input signal corresponding to green of the sRGB color space is externally input is provided.

Display device

A signal conversion circuit () is used for a multiple-primary color liquid crystal display device () which performs color display using four primary colors of red displayed by a red-sub pixel (R), green displayed by green-sub pixel (G), blue displayed by blue-sub pixel (B), and yellow displayed by yellow-sub pixel (Ye), and converts an input three-primary color video signal into a multiple-primary color video signal corresponding to four primary colors. The signal conversion circuit () performs signal conversion such that a gray scale level of the yellow-sub pixel (Ye) is higher than a gray scale level of the green-sub pixel (G) in at least some cases from among cases in which a red gray-scale level r, a green gray-scale level g, and a blue gray-scale level b which are displayed by the three-primary color video signal satisfy a relationship of r&#x3e;g&#x3e;b.

Signal conversion circuit and multi-primary color liquid crystal display device comprising same

This liquid crystal display device () includes a pixel defined by a plurality of subpixels that includes red, green, blue and yellow subpixels (R, G, B, Ye). As long as the sum of respective luminances of all of the subpixels but the blue subpixel (B) falls within the range of 0% to 50% while the color displayed by the pixel is changing from the color blue in which the blue subpixel (B) is at the highest grayscale level and the other subpixels are at the lowest grayscale level into the color white in which all of those subpixels are at the highest grayscale level substantially without changing its hue, the yellow subpixel (Ye) starts to increase its grayscale level at a different timing, and/or has its grayscale level increased at a different ratio with respect to an increase in the pixel's luminance, from the red and green subpixels (R, G) do.

Liquid-crystal display device

A liquid crystal display device includes a liquid crystal display panel and a driving circuit that supplies display signals to a plurality of subpixels of the liquid crystal display panel. The plurality of subpixels are a red subpixel, a green subpixel, a blue subpixel, and a yellow subpixel. When achromatic colors of at least some gray levels among all gray levels are to be displayed by the pixel, display signals which are supplied to a first subpixel group composed of certain two subpixels are display signals of the same grayscale level, whereas display signals which are supplied to a second subpixel group composed of the other two subpixels are display signals of a different grayscale level from the grayscale level of the display signals supplied to the first subpixel group. The first subpixel group includes the yellow subpixel, and the second subpixel group includes the blue subpixel.

Liquid-crystal display and signal converting circuit

A multiprimary liquid crystal display device in which deteriorations in display quality caused by the coloration of a gray representation when viewed from an oblique direction are suppressed, and a signal conversion circuit for use in such a multiprimary liquid crystal display device are provided. A signal conversion circuit according to the present invention is for use in a multiprimary liquid crystal display device, the multiprimary liquid crystal display device having a pixel defined by a plurality of subpixels including a red subpixel, a green subpixel, a blue subpixel, and a yellow subpixel, and performing multicolor display by using four or more primary colors to be displayed by the plurality of subpixels, the signal conversion circuit converting an input video signal to a multiprimary signal corresponding to four or more primary colors. When a video signal for the pixel to display a gray color having a normalized luminance of no less than 0.2 and no more than 0.3 is input, the signal conversion circuit according to the present invention performs a conversion of the video signal so that, among the normalized luminances of the plurality of subpixels, the yellow subpixel has the lowest normalized luminance.

Signal conversion circuit, and multiple-primary-color liquid crystal display device provided with same

A liquid crystal display device according to the present invention comprises a pixel including a plurality of sub pixels. The plurality of sub pixels include a red sub pixel (R), a green sub pixel (G), a blue sub pixel (B), a yellow sub pixel (Ye) and a cyan sub pixel (C). The aperture area size of one of the cyan sub pixel (C) and the blue sub pixel (B) is larger than the aperture area size of any of the other of the cyan (C) and blue (B) sub pixels, the green sub pixel (G) and the yellow sub pixel (Ye); and the aperture area size of the red sub pixel (R) is larger than the aperture area size of any of the other of the cyan (C) and blue (B) sub pixels, the green sub pixel (G), and the yellow sub pixel (Ye).

A signal conversion circuit is disclosed which is suitably used in a multiprimary liquid crystal display device, and a multiprimary liquid crystal display device having such a signal conversion circuit. A signal conversion circuit according to one embodiment of the present invention is for use in a multiprimary liquid crystal display device, and converts an input video signal to a multiprimary signal corresponding to four or more primary colors. When generating a multiprimary signal for displaying dark skin, the signal conversion circuit according to an embodiment of the present invention applies a conversion to the video signal so that a color difference &#x394;u'v&#x2032;=((u&#x2032;&#x2212;u&#x2032;)+(v&#x2032;&#x2212;v&#x2032;)) is 0.03 or less, the color difference &#x394;u&#x2032;v&#x2032; being defined by CIE1976 chromaticity coordinates (u&#x2032;, v&#x2032;) representing a chromaticity when the pixel is viewed from the frontal direction and CIE1976 chromaticity coordinates (u&#x2032;, v&#x2032;) representing a chromaticity when the pixel is viewed from a 60&#xb0; oblique direction.

Signal conversion circuit and multiple primary color liquid crystal display device with the circuit

A liquid crystal device (A) according to the present invention has first and second pixels (Pand P). Each of the first and second pixels (Pand P) includes first, second and third subpixels (R, G, and B). When the input signal indicates that each pixel should represent the first color, the luminances of the respective third subpixels (Band B) of the first and second pixels (Pand P) are different from each other. But when the input signal indicates that each pixel should represent the second color, the average luminance of the respective third subpixels (Band B) is substantially the same as when the first color is specified, and the luminances of the respective third subpixels (Band B) are substantially equal to each other.

Growing community of inventors

Osaka, Japan

Tomohiko Mori