Touch Display Metal Grid Layout for Transmittance and Sensitivity
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Solution Overview
Problem
Existing touch display structures face challenges in balancing high light transmittance and touch sensitivity, as reducing metal line density to improve light transmittance often leads to increased resistance and decreased touch sensitivity.
Innovation Solution
A touch display structure with a light-emitting substrate and touch structure featuring intersecting metal lines forming metal grid squares, where orthographic projections of multiple sub-pixels' light-emitting regions are within a single metal grid square, reducing metal line density while maintaining electrical connections for improved sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal line density is reduced to improve light transmittance, then light transmittance is improved, but resistance increases and touch sensitivity decreases
Solution Approach 1:
The touch electrode is divided into multiple metal grid squares arranged in a matrix pattern, where each grid square is formed by intersecting metal lines. This segmentation allows light to pass through the gaps between the grid squares while maintaining sufficient conductive area for touch sensitivity, thus resolving the contradiction between light transmittance and touch sensitivity
Solution Approach 2:
The metal lines are arranged to form grid squares with specific dimensions and spacing, creating different local densities: sparser arrangement in areas requiring higher light transmittance while maintaining adequate density for touch detection. The grid structure optimizes local properties to balance optical and tactile performance
2Illumination intensity
If metal line density is reduced to improve light transmittance, then light transmittance is improved, but resistance increases
Solution Approach 1:
The touch electrode is segmented into multiple parallel metal lines forming grid squares, where each line contributes to the overall conductive path. This segmentation creates multiple parallel conduction channels that reduce total resistance while maintaining sufficient spacing for light transmission, thus resolving the contradiction between light transmittance and electrical resistance
Solution Approach 2:
The metal lines are arranged in a two-dimensional grid pattern rather than simple linear or radial configurations. This dimensional arrangement optimizes both the conductive pathways (reducing resistance through multiple parallel paths) and the optical properties (allowing light transmission through grid openings) simultaneously
Data Source
AI summary
A touch display structure includes a light-emitting substrate and a touch structure. The touch structure includes first touch channels and second touch channels. At least one first touch channel includes adjacent first sub-touch channels, and a first sub-touch channel includes first touch electrodes; and in the same first touch channel, two adjacent first sub-touch channels are electrically connected; and/or at least one second touch channel includes adjacent second sub-touch channels, and a second sub-touch channel includes second touch electrodes; and in the same second touch channel, two adjacent second sub-touch channels are electrically connected. The touch structure includes crossing metal lines to form metal grid squares which form first touch electrodes and second touch electrodes in the touch structure. The light-emitting substrate includes sub-pixels. Orthographic projections of light-emitting regions of at least two sub-pixels are within a range of an orthographic projection of the same metal grid square.