Touch Display Substrate Reducing Sheet Resistance
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Solution Overview
Problem
In-cell touch technology displays suffer from high sheet resistance due to the division of common electrode layers into multiple blocks, which affects the display effect.
Innovation Solution
A touch display substrate design featuring alternately arranged first and second electrode blocks, connected by lead-wires and compensation electrode lines, reduces sheet resistance by allowing for time-division multiplexing and efficient signal input for both display and touch sensing functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the common electrode layer is divided into multiple electrode blocks, then the touch sensing function is enabled, but the sheet resistance increases
Solution Approach 1:
The common electrode layer is divided into multiple electrode blocks that can be independently controlled, enabling touch sensing functionality while maintaining manageable electrical properties through segmented architecture
Solution Approach 2:
Lead-wires are extended in the thickness direction of the substrate to connect electrode blocks, utilizing the Z-dimension to reduce lateral current paths and lower sheet resistance without compromising touch sensing capability
2Adaptability or versatility
If the common electrode layer is divided into multiple electrode blocks, then touch sensing is enabled, but the display effect deteriorates
Solution Approach 1:
By extending lead-wires in the thickness direction rather than laterally, the design reduces disruption to the display area, maintaining illumination quality while enabling touch sensing through vertical current paths
3Reliability
If lead-wires are extended to connect electrode blocks, then sheet resistance is reduced, but substrate thickness increases
Solution Approach 1:
Lead-wires are configured to extend primarily in the thickness direction of the substrate, efficiently reducing sheet resistance through vertical current paths while minimizing lateral space consumption and maintaining compact form factor
4Ease of operation
If electrode blocks are arranged alternately with data lines, then signal distribution is improved, but device complexity increases
Solution Approach 1:
The display area is segmented into alternating first and second electrode blocks corresponding to different data line groups, enabling systematic signal distribution through a modular, repeatable pattern that manages complexity through regularity
Solution Approach 2:
Different electrode blocks are assigned different connectivity configurations (first blocks to first data lines, second blocks to second data lines), optimizing signal distribution locally while maintaining overall system coherence
Data Source
AI summary
The present disclosure relates to a touch display substrate. The touch display substrate includes a substrate, data lines, a common electrode layer, first lead-wire lines, second lead-wire lines, a pixel electrode layer, and compensation electrode lines. Data lines are distributed at intervals on one side of the substrate along a row direction, and include first data lines and second data lines. The second lead-wires are connected to the second electrode blocks in columns. The pixel electrode layer includes a plurality of pixel electrodes distributed in an array, and two adjacent columns of the pixel electrodes are disposed on both sides of one of the data lines. The compensation electrode lines are disposed on the same layer as the pixel electrodes, and orthographic projections of the second data lines and the compensation electrode lines on the substrate overlap in one-to-one correspondence.