A method and measurement structure for measuring screen edge cracks

Abstract

The invention provides a method for measuring a crack at the edge of a screen, and aims to solve the technical problem that the crack in a cutting precision area at the edge of the screen cannot be accurately measured. The method comprises the following steps: arranging a benchmark wire in a wiring area of the screen; arranging a first detection wire and a second detection wire which are connected with the benchmark wire, wherein the main body parts of the first detection wire and the second detection wire are positioned in the cutting precision area of the screen and have corresponding parts in the extending direction; and loading test signals on the wires to acquire the display state of the screen, so that the extending degree of the crack can be judged. According to the method, the main body parts of the first detection wire and the second detection wire which are connected with the benchmark wire are utilized to form two independent circuits extending in order, so that the extending directions of the two independent wires are related to a cutting reference direction; and through measurement of state changes brought by detection signals of the different detection wires, the cutting state is prevented from interfering the state of the crack, so that the crack detection range is expanded into the cutting precision area. The invention further provides a corresponding measurement structure.

Description

technical field [0001] The invention relates to the field of display panels, in particular to a detection method and structure for edge cracks of a substrate. Background technique [0002] After cutting the overall LCD and OLED screens, due to the influence of the cutting process, cracks will appear on the edges of the independent screens. For the cutting process, there is a cutting accuracy area that allows cutting errors on the edge of the independent screen. The cutting accuracy area has a certain width and is located outside the wiring area. When cutting the screen, if the cutting boundary is in the cutting accuracy area, the cutting position of the screen is considered qualified, and if the cutting boundary is in the wiring area, the cutting position of the screen is considered unqualified. Cracks perpendicular to the cutting direction are allowed in the cutting precision area. When the cracks produced by cutting appear in the cutting precision area, it is considered t...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the embodiment of the present invention provides a method and structure for measuring cracks on the edge of the screen, which is used to solve the technical problem that the cracks in the cutting accuracy area of ​​the edge of the screen cannot be accurately measured

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