Abstract: A signal conversion circuit (20) is used for a multiple-primary color liquid crystal display device (100) 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 (20) 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>g>b.

Abstract: The present invention provides a liquid crystal display device in which a decrease in primary color luminance, a decrease in chroma and an increase in power consumption are suppressed. The present invention is a liquid crystal display device including a color filter substrate where color filters of at least four colors are arranged for respective pixels, wherein a color temperature of white light emitted from a display surface is less than 12000 K.

Abstract: A control section divides a single frame so that a ratio of a period corresponding to a latter sub-frame and a period corresponding to a former sub-frame ranges from 1:3 to 1:7. A divisional point of the frame is a point which allows each of the latter sub-frame and the former sub-frame to minimize a difference between an actual brightness and an expected brightness. The frame may thus be divided at the point where the difference is largest in the normal hold display, so that it is possible to minimize the difference at this point. On this account, it is possible to reduce the difference in a single frame substantially by half as compared with an arrangement for carrying out the normal hold display, and thereby suppress the excess brightness caused by the difference.

Abstract: The present invention is arranged such that interlace image data, which has been supplied, is converted to progressive image data in an I/P conversion section, and the image data converted to progressive style in the I/P conversion section is subjected to image processing including data comparison in spatial or time series manner, in an image processing section.

Abstract: In cases where the amount of gradation transition is greater than a threshold value, a modulation processing section corrects image data D of a current frame by making an interpolation calculation with reference to a look-up table, and output the image data D thus corrected. In cases where the amount of gradation transition is not more than the threshold value, the modulation processing section directly outputs the image data D of the current frame.

Abstract: A multi-primary-color display device includes a number of pixels, each of which includes a first subset including red, green and cyan subpixels and a second subset including blue and yellow subpixels. In each pixel, the subpixels included in the first subset are arranged in series in one direction, while the subpixels included in the second subset are arranged in series in the same direction as the subpixels of the first subset.

Abstract: A display device has an improved white balance in white display and excellent display quality, and includes a plurality of pixels each including four sub-pixels More specifically, the display device includes a plurality of pixels each including: a sub-pixel pair of a red (R) sub-pixel and a green (G) sub-pixel; and a sub-pixel pair of a blue (B) sub-pixel and a green (G) sub-pixel, wherein in most of the pixels, a product of an aperture area per sub-pixel and a light amount per unit aperture area, in each of the red (R) sub-pixel and the blue (B) sub-pixel, is approximately two times that of the green (G) sub-pixel.

Abstract: The liquid crystal display device (100) of the present invention includes a liquid crystal panel (10) having a plurality of pixels (P), and a backlight (20) having at least one light source (22) that emits light to the liquid crystal panel (10). Each of the plurality of pixels (P) includes four or more sub-pixels (R, G, B, Ye), and the light source unit (22) includes a red light source (22R), a green light source (22G), and a blue light source (22B). 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.

Abstract: A multiple primary color display device which suppresses the reduction in the display quality when an input signal corresponding to green in an sRGB color space is input from outside is provided. A display device according to the present invention has a pixel defined by a plurality of sub pixels. The plurality of sub pixels include at least a red sub pixel for displaying red, a green sub pixel for displaying green, a blue sub pixel for displaying blue, and a yellow sub pixel for displaying yellow. When an input signal corresponding to green in the sRGB color space is input from outside, the display device according to the present invention provides display using the yellow sub pixel in addition to the green sub pixel.

Abstract: A multi-primary-color liquid crystal display device (100) according to the present invention includes a liquid crystal display panel (10) with a pixel made up of red, green, blue and yellow subpixels (R, G, B, Ye) and a signal conversion circuit (20) which converts an input three-primary-color video signal into a four-color video signal. If the three-primary-color video signal supplied to the signal conversion circuit is indicated as (r, g, b) using the grayscale levels r, g and b (each of which is an integer of 0 through 255) of the three primary colors of red, green and blue and if the luminance of the color white displayed by the pixel in response to a three-primary-color video signal indicated as (255, 255, 255) is supposed to be 100%, the signal conversion circuit adjusts the level of the four-color video signal so that when a three-primary-color video signal indicated as (186, 0, 0) is input, the luminance of the color red displayed by the red subpixel becomes equal to or greater than 6.5%.

Abstract: A color conversion circuit converts a three-primary-color signal PS0 to a 5-color signal PS5, and includes (i) a color component extraction module that generates, by performing isochromatic conversion, a 7-color signal PS2 made up of 7 color components equivalent in terms of color to color components d1 through d5 of the 5-color signal PS5, and (ii) a matrix operation module that generates color components of the 5-color signal by performing linear combination of the color components of the 7-color signal. With this, it is possible to realize a color conversion circuit by which colors represented by a signal after conversion can be adjusted using intuitively-understandable parameters.

Abstract: A multi-primary color display device according to the present invention includes pixels, each having a plurality of sub-pixels. The plurality of sub-pixels include first, second, third and fourth sub-pixels for displaying first, second, third and fourth colors having first, second, third and fourth hues. The second and third hues are adjacent to the first hue on both sides thereof on an a*b* plane of an L*a*b* colorimetric system. When a color displayed by each pixel changes from black to an optimal color of the first hue, luminance values of the plurality of sub-pixels are set such that the luminance value of the first sub-pixel starts to be increased and also the luminance values of the second and third sub-pixels start to be increased at a rate of increase lower than the rate of increase of the first sub-pixel.

Abstract: A multiple primary color display device according to the present invention includes a pixel defined by a plurality of sub pixels. The plurality of sub pixels include a first sub pixel to display a first color having a first hue, a second sub pixel to display a second color having a second hue, a third sub pixel to display a third color having a third hue, and a fourth sub pixel to display a fourth color having a fourth hue. When a color represented by the input signal is changed from black to white via a color of a prescribed hue, luminance levels of the plurality of sub pixels are set such that the luminance level of each of the first sub pixel, the second sub pixel and the third sub pixel is started to be increased without increasing the luminance level of the fourth sub pixel and such that the luminance level of the third sub pixel is increased at a lower rate than that of the luminance level of each of the first sub pixel and the second sub pixel.

Abstract: 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 ?u?v?=((u??u60?)2+(v??v60?)2) is 0.03 or less, the color difference ?u?v? being defined by CIE1976 chromaticity coordinates (u?, v?) representing a chromaticity when the pixel is viewed from the frontal direction and CIE1976 chromaticity coordinates (u60?, v60?) representing a chromaticity when the pixel is viewed from a 60° oblique direction.

Abstract: A multi-primary-color liquid crystal panel driver (100) according to the present invention includes: a multi-primary-color converter (110) which performs a multi-primary-color conversion to convert the grayscale levels of an input video signal in each of a plurality of vertical scanning periods into grayscale levels of four or more primary colors; and an overdrive circuit (120) which sets, based on the grayscale levels that have been subjected to the multi-primary-color conversion in one vertical scanning period and on the grayscale levels that have been subjected to the multi-primary-color conversion in another vertical scanning period that is earlier than the one vertical scanning period by at least one period, the grayscale levels of the four or more primary colors in that one vertical scanning period. The present invention provides a multi-primary-color liquid crystal panel that can improve the display quality even when the input video signal has varying grayscale levels.

Abstract: A display device for displaying an image may include display and control sections. The display section, provided by a liquid crystal display (LCD), may be configured to display the image with a luminance in accordance with a display signal voltage, the display section including pixels, each pixel in the LCD including first and second subpixels connected to same source and gate lines. The control section may be configured to divide each frame into first to m-th subframe periods, m being an integer greater than or equal to two, the control section configured to generate first to m-th display signals for the subframe periods for output to the display section such that dividing each frame into the subframe periods does not change a sum luminance output of the display section within each frame. The control section may create a difference between luminances of the first and second subpixels.

Abstract: A liquid crystal display apparatus includes a plurality of areas in which response speeds greatly different from each other coexist in a pixel. A first replacement process section replaces the image data of the desired target frame with a first gradation, when a gradation transition from a current frame to a desired target frame corresponds to the above gradation transition. A second replacement process section replaces the image data of the current frame with a second value. The first value is set to a value causing the pixel to respond at a relatively higher speed without the occurrence of the excessive brightness. Without avoiding the deterioration of the image, it is possible to drive a liquid crystal display apparatus including areas whose response speeds are different from each other coexist in the pixel, such as a liquid crystal display apparatus of vertically aligned mode and normally black mode.

Abstract: A display device which exhibits functional effects in which color separation between sub-pixels constituting a pixel is hardly recognized and white line display is easily recognized as one line, in enlargement of the color reproduction range in image display using multi-primary colors, and thereby improves display quality, and provides a liquid crystal display device including such a display device. The display device displays an image constituted by pixels each including sub-pixels of four or more colors, wherein the pixels constituting the display device mainly include a pixel arranging a sub-pixel of a color having the highest brightness value in a central region of the pixel.

Abstract: An image display period of a first sub frame of an N-th frame is arranged to partly overlap the image display period of the second sub frame of the N-th frame and the image display period of a second sub frame of the (N?1)-th frame. Grayscale display voltages with which pixels that are horizontally or vertically neighbored are charged are arranged to have inverse polarities, and the polarity of the grayscale display voltage charging each pixel is reversed in each frame. Furthermore, neighboring data signal lines are short-circuited each time the polarity of the grayscale display voltage output to each data signal line is reversed.

Abstract: A display device (100) 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 (100) 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.