Alignment layer detecting device and method

Abstract

The invention provides an alignment layer detecting device and method, wherein the alignment layer detecting device comprises: an imaging unit used for obtaining the image information of an alignment groove on the alignment layer of a base plate; and an image processing unit used for judging whether the alignment groove on the alignment layer has a defect according to the image information. The alignment layer detecting device and method provided by the invention can detect the defect of the alignment layer on the base plate, can obtain the image information of the alignment groove of the alignment layer on the basal plate through the imaging unit, makes use of the image processing unit to carry out recognition processing according to the image information, and can accurately judge whether each alignment groove has the defect, and compared with the method in the prior art that adopts steam and manual work to detect the defect of the alignment layer, the alignment layer detecting device and method avoid the problems that the recognition rate is lower, the false detection is easy to occur, and the detection efficiency is lower when the manual work is used to detect the defect of the alignment layer of the base plate, and improve the accuracy and reliability of the detection efficiency and detection result.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to an alignment film detection device and method. Background technique [0002] Alignment films are respectively arranged on the array substrate and the color filter substrate of the Thin Film Transistor Liquid Crystal Display (hereinafter referred to as TFT-LCD), and grooves along a certain direction are arranged on the alignment film for making the liquid crystal The molecules are aligned along the direction of the trench without the influence of an electric field. In general, the polyimide (Polyimide, hereinafter referred to as PI) film coated and cured on the glass substrate is rubbed by a rubbing cloth wrapped on the rubbing roller, and the surface of the PI film is obtained along a predetermined direction. Grooves make the PI film an orientation film with orientation function. [0003] In the process of preparing the alignment film, due to the possible defects...

AI Technical Summary

Problems solved by technology

[0008] First, when the water vapor sprayed onto the surface of the glass substrate and the alignment film adheres to the surface of the glass substrate and the alignment film to generate water droplets, due to air flow, evaporation and other factors, the water droplets will continue to disperse, making The detection process requires long-term continuous injection of steam and results in low efficiency

[0009] Second, using manual inspection to detect whether there are defects in the grooves on the alignment film makes the detection efficiency low; moreover, it is difficult to unify the scales of human eye detection by different inspectors, which also makes the reliability of the detection results low.

[0010] Third, because the steam nozzle is held by the inspector, in the case of a large glass substrate and alignment film, some positions of the steam nozzle are "out of reach", which makes it impossible to detect whether there are defects in the grooves in some areas of the alignment film

[0011] Fourth, the steam nozzle is generally directly connected to the heated water tank. When the water level in the water tank is high, some water droplets in the water tank will pass through the steam nozzle and splash onto the alignment film, thereby affecting the subsequent process and causing adverse effects

[0012] Sixth, with the continuous improvement of the detection ability of the alignment groove of TFT LCD, the groove on the alignment film is required to be smaller and smaller, because the uniformity of the water droplets produced on the surface of the glass substrate and the alignment film is low, and human Due to the limitations of eye observation, the above steam detection method cannot meet the needs of the detection of alignment films in TFT LCDs with high alignment trench detection capabilities

[0013] Moreover, since the above-mentioned steam detection method is manual detection, after detection of the groove defect on the alignment film, in general, it is impossible to accurately obtain the position of the defect on the rubbing cloth through manual conversion, which may lead to The repair process cannot eliminate the defects on the friction cloth, so multiple processes are required. If the defects on the friction cloth cannot be eliminated by multiple processes, a new friction cloth must be replaced; thus, it takes a lot of manpower and material resources, and reduces production. utilization rate of the line

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