Touch Display Substrate Grid Optimization for Light Transmittance
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Solution Overview
Problem
In touch display devices, uneven distribution of the conductive grid leads to inconsistent light transmittance, deteriorating the display effect.
Innovation Solution
A touch module with a conductive grid layer and bridging pattern on a base substrate, where first and second touch electrodes are crosswise and insulated, with a bridging pattern connecting adjacent second sub-electrodes, and dummy patterns to optimize light transmittance and touch performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive grid is used to make touch electrodes, then the touch functionality is achieved, but the light transmittance becomes inconsistent when the grid is unevenly distributed
Solution Approach 1:
The patent applies local quality by differentiating the structure of first and second touch electrodes. The first touch electrodes use connected sub-electrodes while the second touch electrodes use independent sub-electrodes with bridging patterns. This local structural differentiation allows optimization of light transmittance in different areas while maintaining touch functionality throughout the display.
Solution Approach 2:
The conductive grid is segmented into first and second touch electrodes with different sub-electrode configurations. The first touch electrodes have connected sub-electrodes forming continuous conductive paths, while the second touch electrodes have independent sub-electrodes connected through bridging patterns. This segmentation allows independent optimization of each electrode type for both touch performance and light transmittance.
2Reliability
If the conductive grid is made with connected sub-electrodes to ensure conductivity, then the touch electrode functionality is maintained, but the light transmittance uniformity deteriorates
Solution Approach 1:
The touch electrodes are segmented into first and second types with different sub-electrode connection structures. First touch electrodes use connected sub-electrodes for optimal conductivity, while second touch electrodes use independent sub-electrodes with bridging patterns to reduce visual impact and improve light transmittance uniformity. This segmentation resolves the contradiction by allowing different conductivity approaches in different locations.
Solution Approach 2:
Different local structures are applied to first and second touch electrodes based on their functional requirements. The first touch electrodes prioritize conductivity with connected sub-electrodes, while the second touch electrodes prioritize light transmittance uniformity with independent sub-electrodes and bridging patterns. This local quality differentiation simultaneously achieves both conductivity and visual uniformity.
3Reliability
If the bridging pattern is added to connect second sub-electrodes, then the touch electrode connectivity is improved, but the device structure becomes more complex
Solution Approach 1:
The bridging pattern merges the function of connecting second sub-electrodes with the existing conductive grid structure. The bridging patterns are integrated into the same layer as the conductive grid, combining multiple functions (connectivity and structural support) into a single integrated structure, thereby reducing overall device complexity despite adding connectivity functionality.
Solution Approach 2:
The bridging pattern serves multiple functions: it connects independent second sub-electrodes to form complete touch electrodes, maintains electrical conductivity, and integrates with the conductive grid structure. This multi-functionality reduces the need for separate components, offsetting the apparent structural complexity with functional consolidation.
Data Source
AI summary
A touch module, touch display substrate and touch display device are provided. The touch module includes: a base substrate, and a conductive grid layer and a bridging pattern disposed on the base substrate; the conductive grid layer covers an entire touch area on the base substrate. The conductive grid layer includes a plurality of first touch electrodes and a plurality of second touch electrodes, the first touch electrodes and the second touch electrodes are arranged crosswise and insulated from each other, each of the first touch electrodes includes a plurality of connected first sub-electrodes, and each of the second touch electrodes includes a plurality of independent second sub-electrodes; the bridging pattern and the conductive grid layer are arranged in different layers; and adjacent second sub-electrodes belonging to the same second touch electrode are connected through the bridging pattern.