Patent ID: 7982702
Filing Date: 2011-07-19
Classification: G02F,G09G

Abstract:
1. A liquid crystal display device, having a liquid crystal layer provided between a pair of substrates and in which liquid crystal molecules in the liquid crystal layer are aligned substantially perpendicularly in a state in which no voltage is applied, and said liquid crystal display device further comprising: a plurality of pixels, arranged in a matrix on one of said substrates, and each having a plurality of subpixel electrodes; a plurality of switching elements, each connected to said plurality of subpixel electrodes; a plurality of data bus lines connected to said switching elements; a plurality of gate bus lines connected to said switching elements for controlling the respective switching elements; a data bus driving circuit, which generates a driving signal from an image signal and supplies the driving signal to said data bus lines to apply the driving signal to said subpixel electrodes via said switching elements; and, alignment regulation structures, provided between said substrates, for regulating direction of alignment of said liquid crystal molecules in a plurality of directions; and wherein, within each pixel, a first subpixel electrode, and a second subpixel electrode with area larger than the first subpixel electrode, are provided, said first subpixel electrode and said second subpixel electrode displaying one color; wherein said data bus driving circuit, while input grayscale values of the image signal for said pixel is in a first grayscale region which is low, applies to said first subpixel electrode a first driving signal which changes from low voltage to high voltage to cause luminance at the first subpixel electrode to change from low luminance to high luminance in accordance with the increase of grayscale values for input grayscale values of said image signal, and applies to said second subpixel electrode a second driving signal which changes from low voltage to high voltage to cause luminance at the second subpixel electrode to change from low luminance to high luminance in accordance with the increase of grayscale values for input grayscale values of said image signal, and which is lower voltage than the first driving signal to cause the luminance to be lower than said first driving signal; and, wherein said data bus driving circuit, while input grayscale values of said image signal is in a second grayscale region higher than said first grayscale region, applies to said second subpixel electrode a third driving signal which changes from low voltage to high to cause luminance at the second subpixel electrode to change from low luminance to high luminance in accordance with the increase of grayscale values for input grayscale value of said image signal, and applies to said first subpixel electrode a fourth driving signal which changes from low voltage to high voltage to cause luminance at the first subpixel electrode to change from low luminance to high luminance in accordance with the increase of grayscale values for input grayscale value of said image signal, and moreover which is lower voltage than the third driving signal to cause the luminance to be lower than said third driving signal, luminance of the second subpixel electrode remaining the same or gradually increasing over substantially the entire grayscale values.