Alignment layer detection machine

Abstract

The invention relates to an alignment layer detection machine used for detecting whether a groove on an alignment layer has defects or not. The alignment layer detection machine comprises a steam supplying mechanism and a sealing chamber. The steam supplying mechanism is used for inputting steam into the chamber; the chamber is used for accommodating a base plate for an alignment layer to be detected inside; at least part of the wall of the chamber is transparent. When the alignment layer detection machine detects whether the groove on the alignment layer has defects or not, the base plate is accommodated in the chamber, the water particle forming speed of the surfaces of the substrate and alignment layer is increased, the thicknesses of the water particles of the surfaces of the substrate and alignment layer are even, time for detection is shortened, and the detecting efficiency and the accuracy of detection results are improved; a machine vision detecting mechanism can be adopted for detection, and the detecting efficiency and reliability of the detection results can be further improved.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to an alignment film detector. Background technique [0002] Alignment films are respectively provided on the array substrate and the color filter substrate of the Thin Film Transistor Liquid Crystal Display (hereinafter referred to as TFT LCD), and the alignment film is provided with grooves along a certain direction for making the liquid crystal molecules They are aligned along the direction of the trench without the influence of an electric field. [0003] 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. [0004] In the process of preparing the alignment film, due to the possible defects of the ...

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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] Fifth, as the resolution of TFT LCD continues to increase, the grooves on the alignment film are required to be smaller and smaller. Due to the low uniformity of the water droplets produced on the surface of the glass substrate and the alignment film, and the limitations of human observation However, the above-mentioned vapor detection method cannot meet the needs of detection of alignment films in high-resolution TFT LCDs.

[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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