Display Substrate Color Filter Insulation Mask Reduction
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Solution Overview
Problem
The manufacturing process of display substrates with multiple layers and complex patterns results in low production efficiency and high costs due to the need for accurate alignment and multiple masks.
Innovation Solution
A display substrate design that integrates a color filter layer with vias to electrically connect touch electrodes and a bridging layer, reducing the number of layers and masks required, and a manufacturing method that forms a bridging layer and touch electrode layer in specific sequences to simplify the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate insulating layer is added between the color filter layer and the touch electrode layer to ensure electrical insulation, then the insulation performance is improved, but the device complexity and manufacturing cost increase due to additional layers and alignment requirements
Solution Approach 1:
The patent combines the insulating layer function with the color filter layer by making the color filter layer itself electrically insulating. This eliminates the need for a separate insulating layer while maintaining the insulation performance between the color filter layer and the touch electrode layer, thus reducing device complexity without compromising reliability
Solution Approach 2:
The color filter layer is designed to serve dual functions: optical filtering (its primary function) and electrical insulation (previously requiring a separate layer). By making the color filter material itself electrically insulating, it performs multiple functions simultaneously, reducing the total number of layers needed in the display structure
2Manufacturing precision
If multiple masks are used to form complex patterns in different layers to ensure precise alignment, then the manufacturing precision is improved, but the productivity decreases and manufacturing cost increases
Solution Approach 1:
The patent merges the patterning steps by forming the color filter pattern and the touch electrode pattern in the same processing step using a single mask. This is achieved by making the color filter layer electrically insulating, allowing the touch electrode to be formed directly over the color filter pattern without requiring additional alignment steps, thus improving productivity while maintaining precision
Solution Approach 2:
The color filter layer is prepared in advance with the appropriate insulating properties and pattern, which enables subsequent layers to be formed without requiring additional alignment masks. This preliminary preparation of the color filter layer with dual functionality (optical and electrical) streamlines the overall manufacturing process
Data Source
AI summary
A display substrate and a manufacturing method thereof, as well as a display device are provided. The display substrate includes a base substrate, a color filter layer, a touch electrode layer and a bridging layer. The touch electrode layer includes first and second touch electrodes intercrossing and insulated from each other, the first touch electrode includes a plurality of first touch sub-electrodes arranged in an extension direction of the first touch electrode. The plurality of first touch sub-electrodes are electrically connected with one another by a bridging line in the bridging layer. Vias for electrically conducting the first touch sub-electrodes and the bridging line are provided in the color filter layer. Since the color filter layer serves as an insulating layer between the touch electrode layer and the bridging layer, it is possible to omit the step of providing individual insulating layer, thereby reducing the number of masks.