Touch Display Panel Position Detection Line Resistance Reduction
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Solution Overview
Problem
In display panels with touch functionality, high electrical resistance in position detection lines can lead to decreased detection accuracy and luminance unevenness, particularly when the position detection electrode is far from the driver, and increasing the line width to reduce resistance compromises the aperture ratio.
Innovation Solution
A display panel design where a first position detection line is connected to position detection electrodes and a second position detection line, overlapping the first, is placed in a different layer and electrically connected at multiple locations, reducing the electrical resistance while maintaining the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the position detection line is increased to reduce electrical resistance, then the electrical resistance decreases, but the aperture ratio decreases
Solution Approach 1:
The patent transitions from a single-layer position detection line to a multi-layer configuration where a first position detection line and a second position detection line are disposed in different layers. This dimensional change allows the lines to overlap in the planar view without increasing the width in any single layer, thereby reducing electrical resistance through parallel conduction paths while maintaining the aperture ratio by utilizing the third dimension (layer depth) rather than expanding in the plane.
Solution Approach 2:
The patent combines multiple position detection lines (first and second lines) into a unified electrical connection system. By electrically connecting these lines in parallel between the position detection electrode and the driver, the total electrical resistance is reduced while the aperture ratio is preserved because the lines occupy different spatial layers rather than competing for the same planar space.
2Reliability
If the width of the position detection line is increased to reduce electrical resistance, then the electrical resistance decreases, but the manufacturing complexity increases
Solution Approach 1:
Instead of increasing the width of a single line, the patent adds another line in a different layer, utilizing the vertical dimension to reduce resistance. This approach distributes the complexity across layers rather than concentrating it in a single wide trace, making the manufacturing process more manageable through standardized multi-layer fabrication techniques.
3Reliability
If a single thick position detection line is used to reduce electrical resistance, then the electrical resistance decreases, but the aperture ratio decreases
Solution Approach 1:
The patent replaces a single thick line with multiple thinner lines distributed across different layers. The first position detection line and second position detection line are disposed in different layers and overlap in the planar view, creating parallel electrical paths that reduce resistance without requiring any single line to be thick, thereby preserving the aperture ratio.
Solution Approach 2:
The patent segments the position detection line into multiple separate conductive paths (first line and second line) that are electrically connected in parallel. This segmentation allows each individual line to remain thin and minimally invasive to the aperture ratio while the collective parallel structure achieves the desired low resistance.
Data Source
AI summary
A display panel includes a glass substrate divided into a display region and a non-display region surrounding the display region, a plurality of pixel electrodes disposed in the display region, a plurality of position detection electrodes disposed in the display region and configured to detect an input position by a position input body, the plurality of position detection electrodes constituting a common electrode disposed overlapping the plurality of pixel electrode, a first position detection line disposed in the display region and connected to a position detection electrode of the plurality of position detection electrode, and a second position detection line disposed in a layer different from a layer of the first position detection line in the display region and overlapping the first position detection line, the second position detection line being electrically connected to the first position detection line at at least two locations.