JP5184790B2 - Liquid crystal overdrive accuracy adjustment device - Google Patents

Description

The present invention is a type of overdrive device for a liquid crystal display, and particularly refers to an adjustment device for overdrive accuracy that realizes improvement in liquid crystal reaction speed and enhancement of video quality.

Please refer to Fig. 1-2. 1 and 2 are schematic views of a known drive method. As shown in FIG. 1, in the conventional driving method, when the gray scale value is switched from the g0 value to the g1 value at the time t0 , the corresponding pixel luminance is changed from Y0 to Y1 . However, since it takes a long time for the pixel luminance to change from Y0 to Y1 , the pixel luminance cannot be an expected Y1 value even in one pixel period.

As shown in FIG. 3, in order to solve this problem, there was a person who insisted on overdrive. Thus, in one pixel period, the pixel brightness reaches the expected Y1 value. Of these, the overdrive grayscale value ( g1 ' ) required by the overdrive is related to the previous grayscale value ( g0 ) and the existing grayscale value ( g1 ).

Refer to FIGS. 3 to 5 are schematic views of a conventional overdrive device. As shown in FIG. 3, the known overdrive device includes a gamma value comparison table 10, a memory control device 12, a memory 14, and an overdrive module 16, and the overdrive shown in FIG. Is realized. The 3 gamma value comparison table 10 (or gamma curve gamma curve) converts the received gray scale value into an appropriate overdrive voltage, and the memory controller 12 receives the pixel value from the 3 gamma value comparison table 10 and stores it in the memory 14. save. The overdrive 16 receives the current gray scale value (g 1) and the previous gray scale value (g 0) from each of the gamma value comparison table 10 and the memory control device 12, and then stores the built-in comparison table 18 (Look-uptable). Check and find the corresponding overdrive grayscale value ( g1 ' ) and enter it into the LCD panel.

In Figure 4, the control table 18 is included grayscale values of a plurality of existing, the grayscale value of the plurality of overdrive grayscale value before the plurality correspond to each other. Taking 256 gray scale values as an example, the comparison table 18 stores 256 × 256 overdrive gray scale values. However, in a general application, in order to reduce the storage cost, the comparison table 18 includes only about 21 × 21 overdrive gray scale values. In other words, a plurality of existing gray scale values of gray scale values 0, 4, 8, 12,..., A plurality of previous gray scale values include only the corresponding overdrive gray scale values. If it is necessary to examine 21 existing grayscale values and six previous grayscale values, the result is obtained by the interpolation method as shown in FIG.

However, the gray scale value of overdrive ( g1 ' ) is originally a numerical value obtained from actual measurement, not a numerical value obtained from an equation. If the calculation is based on the above-described interpolation method, there is a problem of lack of accuracy.

The main object of the present invention is to provide a kind of adjustment device for overdrive accuracy, especially based on the physical characteristics of the liquid crystal display panel (especially for the always required overdrive grayscale value). By adjusting the distance between multiple existing grayscale values or / and multiple previous grayscale values in the control table without increasing the number of overdrive grayscale values that the table stores, It is to improve the accuracy of overdrive by efficiently applying the storage capacity.

Based on the above-mentioned object, the apparatus for adjusting the overdrive accuracy according to the present invention includes a 3 gamma value comparison table, a memory control device, an overdrive module, a 3 gamma value comparison table, a memory control device, and an overdrive. Includes an adjustable gamma module that can be electrically connected to the module. 3 gamma value control table by using the gamma curve (Gamma curve), changing the existing gray scale value of a pixel in a frame to be displayed has been received to the appropriate drive voltage. Memory controller receives the 3 gamma value comparison table if we the developing chromatic gray scale value, and is defined as the gray-scale values before and stored in memory. Overdrive (Overdrive) module the memory control unit is electrically connected to the 3 gamma value control table, a plurality of existing gray scale value, the gray scale of the plurality of overdrive grayscale value before the plurality It encompasses a control table that the value is made to correspond to (Look-up table). Then, the developing chromatic gray scale value of one pixel of the frame to be displayed, and the corresponding pixel in the previous display frame, the front of the gray-scale values, the gray scale value of the overdrive corresponding from said control table Find and input to the LCD panel. Adjustable gamma module 3 gamma value control table it respectively are electrically connected to a memory control device, moreover, it comprises a plurality of adjustment documents. Each said adjustment document, so as to correspond to columns of grayscale values of the successive Adjusted columns of the initial grayscale values in said control table, and, to increase the number of gray-scale values of overdrive said control table stores in no assumption, by utilizing their adjustment article adjusting the spacing between the existing gray-scale values within the sheets.

The invention of claim 1 is a liquid crystal overdrive accuracy adjusting device, applied to a liquid crystal display panel,
A gamma value comparison table that converts the current grayscale value of one pixel in the received display frame to an appropriate drive voltage;
A memory controller that receives the current grayscale value from the gamma value comparison table and stores it in memory and defines it as the grayscale value before the corresponding pixel in the already displayed frame ;
Electrically connected to the memory controller and the gamma value comparison table, and a plurality of existing gray scale values and a plurality of previous gray scale values are mutually associated with a plurality of overdrive gray scale values; A built-in comparison table for driving a liquid crystal display panel according to the current grayscale value of one pixel in the display frame and the previous grayscale value of the corresponding pixel of the previous display frame. the gray scale values of the corresponding overdrive to leave found from comparison table which is the built-in and overdrive module,
The gamma value comparison table is electrically connected to the memory control device and includes a plurality of adjustment materials. Each adjustment material includes an initial gray scale value in the built-in comparison table, and a gray level after adjustment for each column. These adjustments do not increase the quantity of the overdrive grayscale values stored in the built-in control table in correspondence with the scale values, so that these adjustments can be used between these existing grayscale values in the built-in control table. An adjustable gamma module to adjust the spacing of
Characterized in that it comprises a that has a liquid crystal overdrive accuracy of the adjustment device.

The present invention provides a kind of adjustment device for overdrive accuracy, and in particular, a comparison table is stored based on the physical characteristics of the liquid crystal display panel (especially for the always required overdrive grayscale value). By adjusting the distance between multiple existing grayscale values and / or multiple previous grayscale values in the control table without increasing the quantity of overdrive grayscale values, the finite storage capacity of the control table is reduced. It is to improve the accuracy of overdrive by applying it efficiently.

A conventional street Oite the adjustment of the overdrive accuracy of the present invention have acquired grayscale values of the control table (Look-uptable) using the overdrive (Overdrive). The comparison table includes a plurality of existing gray scale values and a plurality of overdrive gray scale values to which a plurality of previous gray scale values correspond. If you need to execute the overdrive, existing grayscale value of one pixel in a frame to be displayed, and based on the grayscale value before the corresponding pixel in the previous display frame, the corresponding overdrive from Sheets Find the grayscale value of.

However, without increasing the number of overdrive grayscale values stored in the control table, it is necessary to efficiently use the limited storage capacity in the control table and to increase the accuracy of the overdrive. In order to calculate the gray scale value of the overdrive without relying on the operation of the interpolation method, the method and apparatus for adjusting the overdrive accuracy of the present invention is particularly suitable for the physical characteristics of the liquid crystal display panel (especially the overdrive always required). The limited storage capacity of the control table by adjusting the spacing between a plurality of existing gray scale values in the control table and / or a plurality of previous gray scale values. Is applied efficiently and the accuracy of overdrive is raised. The following describes how the two embodiments adjust the current grayscale values in the comparison table and / or the spacing between multiple previous grayscale values.

Refer to Fig. 6 to Fig. 8. 6 to 8 are schematic views of the first embodiment relating to the overdrive accuracy adjusting apparatus of the present invention. As shown in FIG. 6, the overdrive device of the present invention includes a 3 gamma value comparison table 10, a memory control device 12, a memory 14, an overdrive module 16, and further includes an adjustable gamma module 20. Adjustable gamma module 20 is electrically connected to each of three gamma value control table 10 and the memory control unit 12.

Upon receiving the existing grayscale value of one pixel of the frame to be displayed, it can be converted by using the 3 gamma value control table 10 and the gamma curve (Gamma curve) to the appropriate drive voltage. Then, when the current gray scale value is transmitted from the 3 gamma value comparison table 10 to the memory control device 12 through the adjustable gamma module 20, the current gray scale value received by the memory control device 12 is stored in the memory 14, Greyscale value. As in the prior art, the overdrive module 16 is also electrically connected to the memory controller 12, 3 gamma value comparison table 10 , and includes the aforementioned comparison table. Overdrive module 16 existing grayscale value of one pixel of the frame to be displayed and, by the gray scale value before the corresponding pixel in the previous display frame, and finds the gray scale value of the corresponding overdrive from Sheets Input to the LCD panel.

To increase the accuracy of overdrive, the adjustable gamma module 20 includes a plurality of adjustment materials shown in FIG. Each adjustment document Exiled one column of the initial gray scale values in the comparison table 18,22A, to correspond to the gray scale value after the adjustment. This way, the adjustable gamma module 20 without increasing the total number of gray scale values of overdrive stored in the control table 22a, between the corresponding existing grayscale values in control table 18 by utilizing their adjustment article it can be adjusted in spacing. Moreover, the corresponding overdrive grayscale value can be entered in the corresponding column.

Specifically, experimental results indicate that whenever a particular liquid crystal display panel has high and low gray scale values, the required overdrive gray scale values must be examined. In order to reduce the gray scale values of these overdrives obtained by low accuracy interpolation, the distance density of the existing gray scale values of high and low gray scale values is intentionally increased. That is, the minimum 0, 4, 8, 12,... Is adjusted to 0, 2, 4, 6, 8, 10, 12,. This forms a correspondence diagram between the existing gray scale value ( g1 ) and the overdrive gray scale value ( g1 ' ) shown in FIG. It should be noted that the distance between the adjusted grayscale value sequence and the initial grayscale value sequence is not necessarily a specific model. Mainly to adjust according to actual demand.

  Please refer to FIG. 9 to 10 are schematic views of a second embodiment relating to the overdrive accuracy adjusting apparatus of the present invention. As shown in FIG. 9, the drive device of the present invention similarly includes a 3 gamma value comparison table 10, a memory control device 12, a memory 14, an overdrive module 16, and an adjustable gamma module 20. Yes. The adjustable gamma module 20 is electrically connected to the 3 gamma value comparison table 10 and the overdrive module 16, respectively.

  As shown in FIG. 10, in the second embodiment, the adjustable gamma module 20 displays these adjustment materials (sequentially using the initial grayscale value column and corresponding to the adjusted grayscale value column. ) Is used to adjust the distance of the corresponding previous grayscale value in the comparison table 18 to form the comparison table 22b.

Additional adjustment of the liquid crystal overdrive accuracy of the present invention, except that it is to adjust the distance density of existing grayscale values and / or previous grayscale values of the gamma value control table 10 with adjustable gamma module 20 In accordance with the physical characteristics of the liquid crystal display panel directly, according to the current grayscale value of one pixel of the display frame and the previous grayscale value of the corresponding pixel in the previous display frame , the initial comparison table 18 ( The interval between the current gray scale value and / or the previous gray scale value in the Look-up table can be dynamically adjusted and input to the liquid crystal display panel. In other words, it is in accordance with the spirit of the present invention whether it is adjusted dynamically through the LUT or adjusted by a calculation formula.

It is the schematic of a known drive method. It is the schematic of a known drive method. It is the schematic of a known drive device. It is the schematic of a known drive device. It is the schematic of a known drive device. It is the schematic of the 1st Example regarding the adjustment apparatus of the overdrive precision of this invention. It is the schematic of the 1st Example regarding the adjustment apparatus of the overdrive precision of this invention. It is the schematic of the 1st Example regarding the adjustment apparatus of the overdrive precision of this invention. It is the schematic of the 2nd Example regarding the adjustment apparatus of the overdrive precision of this invention. It is the schematic of the 2nd Example regarding the adjustment apparatus of the overdrive precision of this invention.

10 Gamma Value Comparison Table 12 Memory Controller 14, 15 Memory 16 Overdrive Module 18, 22a, 22b Comparison Table 20 Adjustable Gamma Module

Claims (1)

Liquid crystal overdrive accuracy adjustment device, applied to liquid crystal display panels,
A gamma value comparison table that converts the current grayscale value of one pixel in the received display frame to an appropriate drive voltage;
A memory controller that receives the current grayscale value from the gamma value comparison table and stores it in memory and defines it as the grayscale value before the corresponding pixel in the already displayed frame ;
Electrically connected to the memory controller and the gamma value comparison table, and a plurality of existing gray scale values and a plurality of previous gray scale values are mutually associated with a plurality of overdrive gray scale values; A built-in comparison table for driving a liquid crystal display panel according to the current grayscale value of one pixel in the display frame and the previous grayscale value of the corresponding pixel of the previous display frame. the gray scale values of the corresponding overdrive to leave found from comparison table which is the built-in and overdrive module,
The gamma value comparison table is electrically connected to the memory control device and includes a plurality of adjustment materials. Each adjustment material includes an initial gray scale value in the built-in comparison table, and a gray level after adjustment for each column. These adjustments do not increase the quantity of the overdrive grayscale values stored in the built-in control table in correspondence with the scale values, so that these adjustments can be used between these existing grayscale values in the built-in control table. An adjustable gamma module to adjust the spacing of
Characterized in that it comprises a liquid crystal overdrive accuracy of the adjustment device.

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