Touch Display Panel Light Transmittance Compensation
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Solution Overview
Problem
Conventional touch display panels experience uneven light transmittance due to varying coverage ratios of the touch electrode layer, leading to the occurrence of bright and dark stripes during touch and display operations.
Innovation Solution
A touch display panel design where the first substrate includes a touch electrode layer with a higher coverage ratio in electrode regions compared to wiring regions, and a color filter layer with adjustable thicknesses to compensate for light transmittance differences, ensuring uniform light transmittance across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transparent conductive layer is formed at the surface of the glass substrate to create touch electrodes and electrode leads, then the touch function is achieved, but the light transmittance becomes uneven across different regions of the panel
Solution Approach 1:
The patent applies local quality by making the color filter layer thickness variable across different regions. Specifically, the color filter layer has a first thickness in the electrode region and a second thickness in the wiring region, with the ratio of first thickness to second thickness being between 0.8-1.2. This local variation in thickness compensates for the uneven light transmittance caused by the touch electrode layer, while maintaining uniform overall light transmittance across the panel.
2Reliability
If the coverage ratio of the touch electrode layer is increased to improve touch sensitivity, then multi-point touch operation is supported, but bright and dark stripes occur due to non-uniform light transmittance
Solution Approach 1:
The patent applies parameter changes by modifying the thickness parameter of the color filter layer in different regions. The color filter layer thickness is adjusted based on the coverage ratio of the touch electrode layer in each region, creating a compensatory relationship that maintains uniform light transmittance while allowing high touch electrode coverage for sensitive multi-point touch operation.
Data Source
AI summary
A touch display device, a touch display panel and a method for manufacturing the touch display panel are provided. The touch display panel includes a first substrate, a second substrate and a liquid crystal layer. The first substrate includes a first base, a touch electrode layer and a color filter layer. The touch electrode layer is arranged at any side of the first base, and the first base is divided into an electrode region and a wiring region. A light transmittance of the color filter layer and a light transmittance of the touch electrode layer are capable of compensating for each other, so that a difference between a light transmittance of the first substrate at the electrode region and a light transmittance of the first substrate at the wiring region is smaller than a threshold.