In-Cell Touch Display Lines with Uniform Resistance
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Solution Overview
Problem
In-cell touch panels experience reliability issues due to resistance deviations between touch lines connected to common electrodes, leading to touch deviations based on electrode positions.
Innovation Solution
The display device features touch lines connected to touch electrodes with the same resistance value, achieved by forming all touch lines in the same length or varying thickness/width to maintain consistent resistance across the electrodes, thereby minimizing resistance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch lines are connected to divided common electrodes at different positions, then the touch panel can sense touch positions accurately, but resistance deviations occur between touch lines causing touch inaccuracies
Solution Approach 1:
The patent changes the physical parameters of touch lines by adjusting their width or length to compensate for position-dependent resistance variations. Touch lines connected to electrodes farther from the driver are made wider or shorter to reduce their resistance, while touch lines connected to nearer electrodes are made narrower or longer. This parameter adjustment equalizes the total resistance across all touch lines, eliminating touch position deviations caused by resistance differences.
2Adaptability or versatility
If common electrodes are divided into multiple electrodes to improve touch sensing, then touch position detection capability is enhanced, but resistance deviations between touch lines increase
Solution Approach 1:
The patent applies local quality by making each touch line have different dimensions (width or length) according to its specific position and connection point. Instead of using uniform touch lines throughout, each touch line is locally optimized with specific width or length characteristics that compensate for its particular resistance challenges, achieving overall resistance uniformity across all touch lines while maintaining the divided electrode structure.
Data Source
AI summary
A display device is disclosed which includes: a first substrate; a second substrate disposed to face the first substrate; a plurality of touch electrodes formed in a fixed area of the first substrate; touch lines connected to the touch electrodes; and a driver disposed in an edge of the first substrate and configured to apply a voltage to the touch lines. The touch lines connected to the touch electrodes have the same resistance value.