Dummy Color Resist Unit for Alignment Detection
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Solution Overview
Problem
The existing methods for detecting alignment accuracy in color filter on array (COA) substrates for liquid-crystal displays require additional detection units in the non-display area, which limits the ability to achieve ultra-narrow frame designs due to increased complexity in the non-display area design.
Innovation Solution
A method and substrate design that incorporates a dummy color resist unit on the periphery of the display area, with sides or center points at predetermined distances from signal lines, allowing for alignment accuracy measurement without the need for detection units in the non-display area, thereby reducing the non-display area and enabling ultra-narrow frame designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection units are disposed in the non-display area to detect alignment accuracy, then alignment detection capability is improved, but the non-display area increases limiting ultra-narrow frame design
Solution Approach 1:
The patent extracts the alignment detection function from the non-display area by utilizing the color resist units already present in the display area. The detection units are integrated with the display pixels rather than being separate additional structures, thereby eliminating the need for extra non-display area while maintaining alignment detection capability.
Solution Approach 2:
The color resist units in the display area serve dual purposes: they function as display elements and simultaneously serve as detection targets for alignment accuracy measurement. This multi-functionality allows the same structures to fulfill both display and detection roles, removing the need for dedicated detection units in the non-display area.
2Measurement precision
If detection units are added in the non-display area, then alignment accuracy can be measured, but device complexity increases
Solution Approach 1:
The patent merges the detection function with the existing display structures by using the color resist units and signal lines already present in the display area. The detection units share the same physical structures (color resist units, signal lines, and non-display area) with the display function, thereby avoiding additional complex designs while enabling alignment measurement.
3Measurement precision
If multiple detection units are disposed in the non-display area, then alignment detection coverage is improved, but the frame width increases
Solution Approach 1:
The patent transitions from using non-display area (horizontal dimension) to using display area (vertical dimension within pixels) for alignment detection. By utilizing the vertical space within each pixel and the signal line structures already present, the detection coverage is achieved without increasing the horizontal frame width.
Data Source
AI summary
The present disclosure provides an array substrate and a method for fabricating the same, a method for detecting alignment accuracy, and a liquid crystal display panel, wherein a dummy color resist unit is disposed on a periphery of a display area of a substrate, and a side or a center point of the dummy color resist unit is designed to be at a predetermined distance from an adjacent signal line. Therefore, it is only necessary to measure a distance between the side or the center point of the dummy color resist unit and a signal line adjacent to it, and compare the measured distance with the predetermined distance to estimate alignment accuracy of color resist units. It is not necessary to dispose detection units in a non-display area of the array substrate so that an area of the non-display area can be reduced to achieve ultra-narrow frame design.