Touch Mesh Bridge Layout Around Display Window Regions
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Solution Overview
Problem
Existing touch control structures face challenges in maintaining connectivity and preventing electrostatic discharge around window regions in display panels, particularly in multi-layer-on-cell touch panels, due to the complexity of connecting mesh electrodes and the proximity of conductive bridges to conductive plates.
Innovation Solution
A novel touch control structure design is introduced, where mesh electrodes are arranged in a row and column direction, with conductive bridges in different layers to enhance connectivity and avoid electrostatic discharge, utilizing a first and second segment configuration to bridge conductive plates across window regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mesh electrodes are connected using conductive bridges in the same layer, then the connection is simple, but electrostatic discharge risk increases due to proximity to conductive plates
Solution Approach 1:
The patent transitions from planar (2D) connection to three-dimensional (3D) connection by placing the conductive bridge in a different layer than the conductive plate. This vertical separation in the Z-dimension reduces electrostatic discharge risk while maintaining electrical connectivity between mesh electrode segments.
Solution Approach 2:
The conductive bridge acts as an intermediary element that connects mesh electrode segments across the window region. By positioning it in a different layer, it mediates the connection while avoiding direct proximity to conductive plates, thus preventing electrostatic discharge.
2Area of stationary object
If conductive bridges are placed close to conductive plates for compact design, then device area is reduced, but electrostatic discharge risk increases
Solution Approach 1:
Instead of reducing horizontal distance between conductive bridges and conductive plates, the patent utilizes the vertical dimension by placing the conductive bridge in a different layer. This maintains compact horizontal layout while eliminating electrostatic discharge risk through vertical separation.
3Measurement precision
If mesh electrodes are arranged to cover window regions for complete touch control, then touch control accuracy is improved, but connectivity complexity increases
Solution Approach 1:
The patent divides the mesh electrodes into separate segments on either side of the window region, with the first mesh electrode segment and second mesh electrode segment connected via conductive bridge. This segmentation allows complete touch control coverage while simplifying connectivity by using a dedicated bridge structure.
Data Source
AI summary
A display panel includes a plurality of light emitting elements; an encapsulating layer on the plurality of light emitting elements; and a touch control structure on the encapsulating layer. The touch control structure includes a plurality of first mesh electrodes along a row direction and a plurality of second mesh electrodes along a column direction. The touch control structure is limited in a touch control region and absent in a window region surrounded by the touch control region. The plurality of second mesh electrodes includes a first mesh block and a second mesh block respectively on a first side and a second side of the window region; and a first conductive bridge connecting the first mesh block and the second mesh block. The first conductive bridge comprises a first segment and a second segment. The second segment is in a layer different from the first segment.