Touch Display Panel Through Hole Distribution Density Control
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Solution Overview
Problem
The existing touch display panels face issues with display mura due to non-uniform distribution of through holes, which are visible and affect the display effect, especially when there is limited space for dummy signal lines in certain touch structures.
Innovation Solution
A touch display panel design that includes a substrate with pixel units, a touch electrode layer, a touch signal line layer, and an insulation layer with through holes, where the distribution density of through holes is less than or equal to 0.1, defined as the ratio of through holes to pixel units, allowing for electrical connection and reducing visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If through holes are punched to connect metal lines and electrodes, then electrical connection is achieved, but non-uniform distribution of through holes causes display mura
Solution Approach 1:
The patent changes the parameter of through-hole distribution from uniform to non-uniform, specifically controlling the density of through holes in different regions. By making the through-hole density lower near the center of electrodes and higher at edges, the patent achieves both reliable electrical connection and eliminates display mura, resolving the contradiction between connection reliability and display uniformity.
2Manufacturing precision
If dummy signal lines are added to achieve uniform through hole distribution, then display mura is solved, but device complexity increases and space is consumed
Solution Approach 1:
The patent extracts and removes the dummy signal lines from the structure, achieving uniform through-hole distribution through the natural arrangement of functional signal lines only. This eliminates the need for additional dummy lines while maintaining display uniformity, thus reducing device complexity and space consumption.
Solution Approach 2:
The patent makes the signal lines serve multiple functions: they provide electrical connection and simultaneously achieve uniform through-hole distribution without requiring separate dummy lines. The same signal lines that are necessary for touch functionality also accomplish the display uniformity requirement, eliminating redundant structures.
3Area of stationary object
If touch signal line and metal layer are arranged in same layer, then space is saved, but no space remains for dummy signal lines to solve display mura
Solution Approach 1:
The patent changes the distribution parameter of through holes to be non-uniform, with lower density in central regions and higher density at edge regions. This parameter change allows achieving display uniformity without requiring dummy signal lines, thus enabling the touch signal line and metal layer to be arranged in the same layer while maintaining both space efficiency and display quality.
Data Source
AI summary
A touch display panel, including a first substrate; a plurality of pixel units on first substrate and arranged in array; a touch electrode layer on first substrate, including a plurality of touch electrodes arranged in array and insulated from each other, a touch signal line layer, including a plurality of touch signal lines; a control circuit for providing touch signal to touch electrode, each touch signal line electrically connecting one touch electrode with control circuit, and each touch electrode electrically connected with at least one touch signal line; an insulation layer between touch electrode layer and touch signal line layer, including a plurality of through holes, touch electrodes electrically connected with touch signal lines via through holes; wherein distribution density of through hole is not more than 0.1 and defined as: ratio of the number of through hole to the number of pixel unit covered by one touch electrode.