Method for detecting poor pixel points of liquid crystal panel

Abstract

The invention discloses a method for detecting pool pixel points of a liquid crystal panel. The method comprises the steps of S101, setting test line scanning time according to actual line scanning time of the liquid crystal panel; S103, performing line scanning on the liquid crystal panel by using the test line scanning time and applying a bias voltage to a common electrode of the liquid crystalpanel; S105, taking a line scanning start signal of the liquid crystal panel as a detection starting point and sequentially cyclically inputting test voltage signals from first to fifth stages on a data line of the liquid crystal panel within a preset time; S107, presenting the poor pixel points to viewers in a flickering manner. The method can simultaneously detect a plurality of types of poor pixel points existing in the liquid crystal panel under one frame of picture, and at the same time, reduce the number of pictures and improve the detection efficiency.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a method for detecting defective pixels of a liquid crystal panel. Background technique [0002] With the development of technology and the requirement of narrow borders, more and more LCD panels use GOA (gate on array) or GIP (gate in panel) technology to realize the row driving function, and no additional row driver chips are needed. [0003] For this type of LCD panel, the current detection method is to use a conventional driving method (timing, frame frequency, etc.), scan each line of the LCD panel, and display multiple screens such as black, white, and gray on the LCD panel to determine whether there are spots, There are various bad pixels such as lines and unevenness. Among them, a black picture or a half-screen white and half-black screen are displayed on the screen (that is, half the screen is displayed as the highest grayscale white, and the other half screen is displ...

AI Technical Summary

Problems solved by technology

[0004] However, in the on-site inspection, it was found that there is a kind of bad pixel, because of the process and other reasons, there is a small leakage current on the pixel electrode of the liquid crystal, and at this time the thin film transistor is in normal operation, using a black screen or a half-screen black and half-screen white screen. In the test, no bright spots can be observed, so it will lead to missed detection of such bad pixels

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