Method for detecting foreign particles in LCD panel and LCD panel control circuit

A technology of liquid crystal panels and foreign matter particles, applied in the field of foreign matter detection, can solve problems such as difficulty in detection, display color difference, missed detection, etc., and achieve the effect of improving the pass rate and detection rate

CN101900893BInactive Publication Date: 2012-04-04BOE TECH GRP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-04-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for detecting foreign particles in an LCD panel and an LCD panel control circuit. The detection method comprises the following steps of: connecting grid start voltage to a grid line, and connecting signal voltage to a data line to make liquid crystal molecules reach the set torsion angles; stopping connecting the signal voltage to the data line, and connecting first voltage which is greater than grid disconnection voltage and smaller than the grid start voltage to the grid line; and checking an image displayed by the LCD panel, wherein foreign particles are present at the position showing abnormal colors and / or abnormal gray level. The control circuit comprises a data driving circuit, a grid driving circuit and a first voltage generating circuit. Due to the adoption of the technical means of firstly applying an electric field to reverse the liquid crystal molecules and performing electric leakage on the electric field so as to recover the torsion of the liquid crystal molecules under the action of the force of the liquid crystal molecules, the difference of the foreign particles-influenced liquid crystal molecules presented on the image is more obvious, and the detection rate of the foreign particles can be improved.
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Description

technical field

[0001] The invention relates to foreign matter detection technology in a liquid crystal panel, in particular to a method for detecting foreign matter particles in a liquid crystal panel and a liquid crystal panel control circuit. Background technique

[0002] A liquid crystal panel (Panel) is formed by a pair of two substrates, and a liquid crystal layer is filled between them. Although there are cleaning measures, some fine foreign matter particles may be encapsulated into the LCD panel during the manufacturing process of the LCD panel. Whether these foreign particles are conductive or non-conductive, they will affect the display effect of the liquid crystal panel, especially the display effect of high-precision displays such as medical device display screens.

[0003] The existing liquid crystal panel cell test (Cell Test) method for detecting foreign particles in the cell is to input a normal monochrome image signal to the cell LCD panel after the backlig...

Examples

no. 1 example

[0030] figure 2 It is a flowchart of a method for detecting foreign matter particles in a liquid crystal panel provided in the first embodiment of the present invention, and the method includes the following steps:

[0031] Step 10, pass the gate turn-on voltage Von to the gate line on the array substrate, and pass the signal voltage to the data line on the array substrate, thereby charge the signal voltage to the pixel electrode on the array substrate, the signal voltage and the color filter The common voltage on the common electrode of the substrate forms a torsion electric field, which is applied to both ends of the liquid crystal layer, so that the liquid crystal molecules reach a set twist angle.

[0032] Step 10 is a routine step of inputting images to the liquid crystal panel. It is preferable to input the same signal voltage to all pixels so as to present a single-color image, and the signal voltage is preferably a voltage that drives liquid crystal molecules to twist...

no. 2 example

[0048] image 3 It is a partial circuit schematic diagram of the liquid crystal panel control circuit provided by the second embodiment of the present invention. The control circuit of the liquid crystal panel includes a gate drive circuit and a data drive circuit, and also includes a first voltage generation circuit, and the first voltage generation circuit is connected to the control circuit. The first voltage generating circuit specifically includes: a gate cut-off switch 15 , a power switch 16 and a first voltage source 17 . Wherein, the gate cut-off switch 15 is used to cut off the connection between the gate drive circuit and each gate line, and the gate drive circuit and the data drive circuit control to apply a torsion electric field to the liquid crystal layer so that the liquid crystal molecules reach the set twist angle, When the voltage value at both ends of the torsional electric field remains, the gate cut-off switch 15 performs an opening action to disconnect t...

no. 3 example

[0051] Figure 4 It is a partial circuit schematic diagram of the liquid crystal panel control circuit provided by the third embodiment of the present invention. The difference between this embodiment and the above-mentioned second embodiment is that the first voltage generating circuit includes a voltage dividing rheostat 18, and the voltage dividing rheostat 18 is connected between the gate driving circuit and the gate line, and is used to change the direction of the gate driving circuit to The value of the voltage supplied to the gate line is used to supply the first voltage. Specifically, it can be connected to the grid disconnection voltage supply line.

[0052] The embodiment of the control circuit of the liquid crystal panel of the present invention can implement the technical solution of any embodiment of the method for detecting foreign matter particles in the liquid crystal panel of the present invention, and the gate drive circuit and the data drive circuit in the ...