Evaluation apparatus of liquid crystal display device, liquid crystal display device, and evaluation method of liquid crystal display device

Abstract

An evaluation apparatus of a liquid crystal display device in accordance with the present invention is provided with a signal section for supplying a signal to a liquid crystal panel to be evaluated; a display detection section for sensing a display state on the liquid crystal panel; an analysis section for analyzing a detection result of the display detection section. The signal section supplies to the liquid crystal panel a signal corresponding to an original tone and then, in accordance with tone transition from the original tone to an attainment tone, either an overshoot test signal or both an overshoot test signal and an undershoot test signal in test driving, while sweeping either a level of the signal or levels of both the signals. The analysis section analyzes detection results of the display detection section obtained in the test driving and stores in association with the original tone and the attainment tone, a level of the test signal that corresponds to an optimum one of the detection results. With this, it is possible to easily and highly accurately obtain an optimum level of the overshoot signal or the undershoot signal for the liquid crystal panel to be evaluated.

Description

field of invention [0001] The present invention relates to, for example, an evaluation device of a liquid crystal display device, a liquid crystal display device equipped with a driving circuit using an overadjustment parameter obtained through the evaluation, and an evaluation method of a liquid crystal display device. evaluation of. Background technique [0002] In recent years, the progress of the flat panel display (FPD) is obvious to all, and the picture tube display has been gradually replaced by various FPDs. In particular, technical progress of liquid crystal displays (Liquid Crystal Display: LCD) that existed prior to FPD is also evident, and it is used in various scenes in daily life, and expectations for its development are further raised. [0003] However, LCDs have so far had major disadvantages. One of the representatives is the so-called display that is not good at animation. One of the main reasons listed is that the liquid crystal responds slowly. The re...

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Problems solved by technology

[0014] However, in the case of calculating the OS parameter based on the change in capacity, the influence on the viscous response of the liquid crystal is not fully considered, and thus, the error between the calculation result and the actual necessary OS parameter value becomes large.

In other words, if the original method is used, the amount of OS must be determined in the same way depending on the thickness of the cell, the shape of the cell, and the liquid crystal material used, etc. In practice, the maximum error of more than 30% will occur depending on the location.

On the other hand, the user's allowable value relative to the parameter error is relatively loose so far. If only in terms of tolerance to animation display, the LCD with a slow response can be speeded up, and a certain degree of parameter error can be allowed, not just For high-speed response, the allowable range of parameter error is extremely strict for the future that requires finer image quality, and it is difficult to obtain OS parameter C with smaller error using existing technology

[0015] Furthermore, the method of estimating from the response waveform includes all the necessary conditions, but in the confirmation of the correct OS parameter C, there is a problem that it takes time to confirm the waveform by using the manufactured LUT for OS driving.

In addition, when the results of the waveform confirmation must be adjusted, before the correct OS parameter C is determined, it is necessary to repeatedly perform the above-mentioned estimation and confirmation measurement, which takes a lot of time.

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