In-cell Touch Panel Electrode Segmentation for Opening Rate
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Solution Overview
Problem
In-cell touch panels have a low opening rate due to the need for insulation between touch driving and sensing electrodes, which affects the pixel structure and light transmittance.
Innovation Solution
The touch driving and sensing electrodes are integrated on a color filter substrate at the same layer, with independent electrode units connected by bridge lines, allowing for reduced thickness and improved pixel opening rate without affecting image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch driving electrodes and touch sensing electrodes are added in the region corresponding to array substrate and black matrix, then touch functionality is achieved, but opening rate of sub-pixel units is reduced
Solution Approach 1:
The touch driving electrode is divided into multiple electrode units that are selectively arranged. Instead of using a continuous electrode structure, the electrode is segmented into discrete units that can be positioned to minimize obstruction of light paths, thereby maintaining higher opening rates while still providing touch functionality.
Solution Approach 2:
The electrode units are selectively positioned in specific regions rather than uniformly distributed. By placing electrode units only where needed for touch detection and leaving other regions open, the design achieves local optimization that maintains both touch functionality and high opening rate in critical light transmission areas.
2Reliability
If gate scan lines and touch driving electrode keep certain distance for insulation, then electrical insulation is ensured, but opening rate is reduced
Solution Approach 1:
The insulation problem is solved by transitioning from planar separation to three-dimensional spatial arrangement. The bridge line connects electrode units at different vertical levels or through insulated pathways, allowing electrical connection while maintaining spatial separation for insulation, thus resolving the contradiction between connectivity and insulation requirements.
Solution Approach 2:
The bridge line acts as an intermediary element that provides electrical connection between electrode units while being insulated from other conductive elements like gate scan lines. This intermediary structure enables current flow where needed while maintaining insulation where required, solving the dual requirement of connectivity and electrical isolation.
Data Source
AI summary
The present invention discloses an in-cell touch panel and a display device to improve the opening rate of the in-cell touch panel. The in-cell touch panel provided by the embodiment of the present invention comprises a first substrate and a second substrate opposite to each other, a black matrix layer and a color resin layer located at the side of the first substrate close to the second substrate, and a pixel array located at the side of the second substrate close to the first substrate, and further comprises a plurality of first electrodes located on the first substrate or the second substrate and extending in a first direction and a plurality of second electrodes extending in a second direction crossing the first direction; the first electrodes and the second electrodes are disposed at the same layer and insulated from each other; the first electrodes comprise a plurality of electrode units independent of each other, the electrode units and the second electrodes are arranged with an interval therebetween, and two electrode units which belong to the same first electrode and are located at two sides of the second electrodes are electrically connected through a bridge line.