Patent application number | Description | Published |
20090002585 | Liquid Crystal Display Device - In one embodiment of the present invention, a large-screen or high-definition LCD is provided with its display quality improved significantly by reducing the viewing angle dependence of γ characteristic. Each pixel includes first and second subpixels, to which different voltages are applicable. The device further includes electrically independent storage capacitor trunks, each of which is electrically connected to the respective storage capacitor counter electrodes of either the first or second subpixels through storage capacitor lines. The pixels include pixels belonging to a first display area and pixels belonging to a second display area. The first and second display areas can be scanned independently of each other. And the storage capacitor trunks include a first storage capacitor trunk belonging to the first display area and a second storage capacitor trunk belonging to the second display area. | 01-01-2009 |
20090051641 | Active Matrix Type Liquid Crystal Display Device and Drive Method Thereof - A voltage corresponding to a black display is applied in a part of one frame period. When a black signal insertion period is changed, the black signal insertion period after the change is controlled so that (i) a time from a position at which a signal voltage of a first or second storage capacitor line rises to a position at which a first black insertion pulse rises in the black signal insertion period before the change becomes equal to (ii) a time from a position at which a signal voltage of the first or second storage capacitor line rises to a position at which a first black insertion pulse rises in the black signal insertion period after the change. This makes it possible to provide an active matrix type liquid crystal display device capable of preventing the occurrence of a difference in luminance between an upper side of a display panel screen and a lower side of the display panel screen in a case where black insertion is carried out with respect to a display panel which forms bright and dark sub-pixels by changing, for every sub-pixel, an effective voltage to each pixel by capacitive coupling of a storage capacitor and a liquid crystal capacitor, and a drive method of the active matrix type liquid crystal display device. | 02-26-2009 |
20090153454 | Color Liquid Crystal Display Device and Gamma Correction Method for the Same - In one embodiment of the present application, a color liquid crystal display device is disclosed which can realize display having a high color reproducibility when a screen is viewed from an oblique direction as well as from a front direction, while improving a viewing angle dependence of γ-characteristics by employing a pixel division method. Gamma correction is carried out as follows independently for each R, G, and B with reference to R, G, and B correction tables so as to obtain a good color tracking. That is, the gamma correction is carried out such that chromaticity in the front view is shifted toward blue in an oblique hue correction range, which is determined by a pixel division ratio and the like, so as to reduce a shift of the chromaticity in the oblique view toward yellow in the oblique hue correction range, while maintaining a color balance in the other range (a gradation value range of 32 to 255 except for the oblique hue correction range). The present invention is suitable for a color liquid crystal display device employing the pixel division method. | 06-18-2009 |
20090195487 | LIQUID CRYSTAL DISPLAY DEVICE - A liquid crystal display device according to the present invention includes a plurality of pixels, each including first and second subpixels. When a predetermined grayscale tone is displayed continuously through four or more consecutive even number of vertical scanning periods, the first and second subpixels have different luminances in at least two of the even number of vertical scanning periods, first polarity periods that are included in the vertical scanning periods and that maintain a first polarity are as long as second polarity periods that are also included in the vertical scanning periods and that maintain a second polarity for each of the first and second subpixels, and in each of the first and second polarity periods, the difference between the average of effective voltages applied to the liquid crystal layer of the first subpixel and that of effective voltages applied to the liquid crystal layer of the second subpixel is substantially equal to zero. | 08-06-2009 |
20090268110 | LIQUID CRYSTAL DISPLAY - Each pixel includes first and second subpixels and two switching elements provided for those subpixels. Each subpixel includes a liquid crystal capacitor and a storage capacitor. The storage capacitor counter electrodes of the first and second subpixels are electrically independent. A storage capacitor counter voltage applied to each storage capacitor counter electrode by way of its associated storage capacitor line has a first period (A) with a first waveform during one vertical scanning period. The first waveform oscillates between multiple voltage levels in a first cycle time (P | 10-29-2009 |
20090273556 | Display Device - To make a conventional area grayscale display technique applicable to a driving method that is designed to write data in a vertical blanking interval. A display panel with multiple pixels and a display controller that receives an input video signal and a sync signal and gets an image presented on the display panel are provided. If one horizontal scanning period and one vertical scanning period of the input video signal are represented by 1H and V-Total, respectively, the display controller is able to form one vertical scanning period V-Total of a first period in which one horizontal scanning period of the display panel is 1Ho, which is as long as 1H, and a second period in which one horizontal scanning period of the display panel is 1Hn, which is not as long as 1H. | 11-05-2009 |
20100182345 | LIQUID CRYSTAL DISPLAY - Each picture element includes first and second sub-picture elements, each of which includes a liquid crystal capacitor and at least one storage capacitor. After a display voltage representing a certain grayscale level has been applied to the respective sub-picture element electrodes of the first and second sub-picture elements, a voltage difference ΔVα is produced between voltages to be applied to the respective liquid crystal capacitors of the first and second sub-picture elements by way of their associated storage capacitor(s). By setting the voltage difference ΔVα value of the blue and/or cyan picture element(s) to be smaller than that of the other color picture elements, shift toward the yellow range at an oblique viewing angle can be minimized. | 07-22-2010 |
20100238151 | Displaying device, its driving circuit and its driving method - The present invention relates to display devices. The present invention aims to provide a display device capable of eliminating display irregularities due to the difference in the charging rate between lines, while preventing increase in heat generation and power consumption by the device, and also to provide a circuit and method for driving the same. In a liquid crystal display device employing both a 2-line dot-inversion drive method and a charge-sharing method, a second charge-sharing period (TB), which is a charge-sharing period within a horizontal scanning period (2H period) in which the polarity of each data signal is the same as that in one horizontal scanning period previous thereto, is set to be longer than a first charge-sharing period (TA), which is a charge-sharing period within a horizontal scanning period (1H period) in which the polarity of each data signal is different from that in one horizontal scanning period previous thereto. Thus, a charge period within the 2H period can be shorter than that within the 1H period. | 09-23-2010 |
20130088527 | Color Liquid Crystal Display Device And Gamma Correction Method For The Same - A color liquid crystal display device configured to employ a pixel division method in which each pixel of a displayed image is configured with sub-pixels obtained by spatial division of one pixel in a division ratio may include: pixel formation portions provided correspondingly to respective pixels of the image, each portion configured to form a pixel of primary colors with the sub-pixels; a drive circuit configured to provide each portion with applied voltages respectively corresponding to the sub-pixels composing the pixel to be formed by that portion, based on a gradation value indicated by an input signal provided as a video signal representing the image; and a gamma correction part configured to correct a relationship between the gradation value indicated by the input signal and a luminance value of the pixel to be formed by that portion according to the gradation value independently for each of the primary colors. | 04-11-2013 |