Diagonal Touch Electrode Structure for Display Panels
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Solution Overview
Problem
In display devices with built-in touchscreens, parasitic capacitance between touch electrodes and gate lines can cause uneven load distribution, leading to differences in gate signal characteristics and reduced image quality.
Innovation Solution
The display panel incorporates a touch electrode structure where parasitic capacitance is dispersed across multiple gate lines, with touch electrodes arranged in a diagonal manner and edge portions having a stair shape, allowing for even distribution of parasitic capacitance without relying on specific gate lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch electrodes are arranged in a conventional grid pattern, then touch sensing function is achieved, but parasitic capacitance concentrates on specific gate lines causing uneven load distribution
Solution Approach 1:
The patent applies asymmetry by arranging touch electrodes in a diagonal pattern rather than a conventional grid, and by designing edge portions with stair shapes. This asymmetric arrangement prevents parasitic capacitance from concentrating on specific gate lines, thereby resolving the contradiction between achieving touch sensing functionality and avoiding parasitic capacitance concentration.
2Measurement precision
If touch electrodes are positioned to maximize touch sensitivity, then touch detection capability is improved, but differences in gate signal characteristics increase due to uneven parasitic capacitance distribution
Solution Approach 1:
The patent transitions from a conventional two-dimensional grid arrangement to a diagonal arrangement that effectively utilizes the third dimension of spatial distribution. By positioning touch electrodes along diagonal lines and incorporating stair-shaped edge portions, the patent distributes parasitic capacitance more evenly across gate lines while maintaining touch detection sensitivity.
3Device complexity
If conventional touch electrode structures are used, then device complexity is minimized, but image quality deteriorates due to load differences between gate lines
Solution Approach 1:
The patent applies local quality by modifying only the edge portions of touch electrodes with stair shapes while maintaining the overall diagonal arrangement. This localized modification approach improves gate signal characteristic consistency and image quality without significantly increasing overall device complexity, as the core electrode structure remains relatively simple.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces differences in load between gate lines, improving image quality by ensuring consistent gate signal characteristics and efficient touch sensing.
Implementation Method 1
capacitive touch sensing is commonly used, in which a plurality of touch electrodes (e.g., row electrodes and column electrodes) are disposed on a touchscreen panel (TSP) to detect a touch and touched coordinates based on changes in capacitance between specific touch electrodes or changes in capacitance between specific touch electrodes and a pointer, such as a finger
Implementation Method 2
undesirable parasitic capacitance may be formed in addition to capacitance required for touch sensing. Undesirable parasitic capacitance may be formed between touch electrodes and gate lines
Data Source
AI summary
A display panel is provided having a built-in touchscreen and a touch display device including the same. The display panel has a touch electrode structure allowing parasitic capacitance to be dispersed to a greater number of gate lines, which form parasitic capacitance together with touch electrodes, without concentrically relying on specific gate lines. Differences in load between gate lines are reduced to improve image quality.