Liquid crystal driving device, liquid crystal display device, and liquid crystal driving method
A liquid crystal driving and liquid crystal display panel technology, which is applied in static indicators, nonlinear optics, optics, etc., and can solve the problems of increasing information volume and increasing the number of look-up tables.
Inactive Publication Date: 2009-11-04
SHARP KK
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Problems solved by technology
[0011] By setting the lookup tables in this way, the number of lookup tables increases, resulting in a problem that the amount of information to be stored in the memory increases significantly.
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[0070] according to Figure 1 to Figure 8 One embodiment of the present invention will be described as follows.
[0071] according to figure 1 The overall structure of the liquid crystal display device 1 of this embodiment will be described. In order to improve the optical response speed of the liquid crystal display panel, the liquid crystal display device 1 performs grayscale conversion on input grayscale data by referring to a grayscale conversion table, thereby performing overshoot driving. In addition, the liquid crystal display device 1 adjusts the above-mentioned gray scale conversion according to the vertical frequency of the displayed image and the temperature of the liquid crystal in the liquid crystal display panel (liquid crystal temperature), thereby performing more appropriate overshoot driving, and strives to improve display quality.
[0072] Such as figure 1 As shown, the liquid crystal display device 1 includes: a liquid crystal display panel 10 ; a sourc...
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A liquid crystal controller (20) comprises a memory (21) for storing a plurality of gradation conversion tables (21b) having gradation changing degrees different from each other, a selection unit (22a) for selecting such one from the gradation conversion tables (21b) as is referred to, and a conversion unit (22b) for converting the input gradation data with reference to the gradation conversion table (21b) selected. The selecting condition in the selection unit (22a) is set such that the gradation conversion table of the higher gradation changing degree is selected as the vertical frequency of the liquid crystal display becomes the higher and as the liquid crystal temperature becomes the lower. At least some of the gradation conversion tables (21b) are set such that the range of the liquid crystal temperature, for which the gradation conversion tables are selected, may be the larger as the vertical frequency becomes the higher. As a result, a more proper gradation conversion is realized for an overshoot drive.
Description
technical field [0001] The present invention relates to a liquid crystal driving device, a liquid crystal display device and a liquid crystal driving method for performing overshoot driving by performing gray scale conversion on input gray scale data by referring to a gray scale conversion table. Background technique [0002] Conventionally, liquid crystal display devices (LCDs) have a disadvantage that they are not suitable for displaying moving images due to the slow response speed of liquid crystals. As a measure to overcome this disadvantage, a liquid crystal driving method called overshoot driving (OS driving, overdriving) has been developed (for example, refer to Patent Document 1). [0003] The so-called overshoot driving refers to a driving method that accelerates the response of the liquid crystal by applying an emphatic voltage when the response of the liquid crystal is transient, in an effort to improve the response speed. Specifically, it is such a method: that ...
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IPC IPC(8): G09G3/36G09G3/20G02F1/133
CPCG09G2340/16G02F2203/30G09G2320/0252G09G2320/041G09G3/3611G09G2320/0673G02F1/133382
Inventor 古川智朗藤冈和巧
Owner SHARP KK