Light shield repair method and light shield repair device of LED display screens

Abstract

The invention discloses a light shield repair method of LED display screens, which comprises the following steps: a shim plate which at least resists the high temperature of 400 DEG C is arranged below a light shield to be repaired, wherein the shim plate is made of soda or quartz glass; a layer of heat conductive material is arranged on the shim plate, wherein the heat conductive material is copper foil; and after being arranged on the heat conductive material and heated, the light shield to be repaired is repaired. The dimension of the light shield is 3 inches, 4 inches or 5 inches. The copper foil is attached to the four corners of the glass surface of the light shield. The invention also discloses a corresponding light shield repair device of LED display screens. The light shield repair method of LED display screens has the advantages of good repair quality, strong reliability and difficult drop of repair points, does not damage a light shield in the process of repair, ensures the integrity, avoids discarding, reduces the production cost and enhances the production efficiency.

Description

technical field [0001] The invention relates to a photomask production process, in particular to a method and device for repairing a photomask of an LED display screen. Background technique [0002] Photomasks are widely used in various industries such as LCD, PCB, IC, and LED displays, and they are mainly large-sized photomasks. However, in the past two years, with the rapid development of the LED display industry and the concentration of LED chips, the The demand for LED display photomasks is also increasing, and the LED display industry mainly uses small-sized photomasks such as 3 inches, 4 inches, and 5 inches. [0003] After the product designer makes a circuit pattern through computer-aided software, the circuit pattern is branded on the photoresist of the glass substrate by laser or electron beam exposure. The glass substrate produced after the branding is called a photomask; [0004] Specifically, the manufacturing process of the mask is as follows: [0005] Coatin...

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Problems solved by technology

[0010] Due to the small size (3 inches, 4 inches, 5 inches) of the mask area, the thickness of the glass substrate is relatively thin (the thickness is 2.3mm and 1.5mm); in addition, the thermal conductivity of the glass is low (the thermal conductivity of the glass is at room temperature The lower is about 0.75W / (m*k)), therefore, when the temperature changes sharply, the glass is prone to breakage

[0011] If the existing scheme is used to repair the small-sized photomask, especially when repairing the pinhole defects on the edge of the small-sized photomask, use a heating device to bake the small-sized photomask at a high temperature (at about 400 degrees), the small-sized photomask Damage will occur and cause scrapping, reducing production efficiency and increasing costs; if the baking temperature is lowered to below 400 degrees, then small-sized photomasks are less likely to be damaged, but the reliability of the repair material is not strong, and its repair It is very easy to fall off during the cleaning and wiping process, and the falling off of the repair point will bring serious quality risks

[0012] To sum up, the above solution will not cause problems when repairing large-scale masks, but for small and thin small-size masks, it cannot achieve a good repair effect. Dimensional mask, generally only scrapped

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