Touch Display Panel Slit Area Ratio Optimization
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Solution Overview
Problem
Memory in pixel (MIP) displays face challenges in achieving gray scale display due to the mura issue, which is exacerbated when combined with on-cell touch panels having slit designs, leading to increased visibility of the touch electrode layer.
Innovation Solution
A touch display panel design featuring an array substrate, display medium layer, and color filter substrate with a touch electrode layer having slits with specific projection areas over color filter regions, ensuring area ratios between these regions are less than 10%, thereby reducing the visibility of the touch electrode layer and minimizing the mura issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slits are designed in the touch electrode layer to reduce mura issue, then display uniformity is improved, but the touch electrode layer becomes more visible
Solution Approach 1:
The color filter layer is divided into multiple color regions (red, green, blue, yellow, cyan, magenta) with different optical properties. Each color region has specific slit area ratios designed to control light transmission locally, achieving uniform display while reducing touch electrode visibility through differentiated local optical characteristics
Solution Approach 2:
The patent optimizes the slit area ratios in different color regions as key parameters. By setting specific ratio ranges (e.g., red region slits 15-30%, green region slits 25-40%, blue region slits 30-45%), the display uniformity is improved while controlling the visibility of the touch electrode layer through parameter optimization
2Loss of information
If light-transmitting regions are used to control gray scale in MIP display, then gray scale display capability is improved, but mura issue is exacerbated when combined with traditional slit design
Solution Approach 1:
The patent merges the gray scale control function with the slit design by integrating multiple color filters and slits into a unified structure. The color filter layer with multiple color regions and the touch electrode layer with slits work together as a combined system to achieve both gray scale display and uniformity, resolving the conflict between the two functions
Solution Approach 2:
The display structure uses a composite design combining multiple color filters (red, green, blue, yellow, cyan, magenta) with different slit configurations. This composite approach allows different color regions to contribute differently to gray scale control while maintaining overall display uniformity through coordinated design
Data Source
AI summary
A touch display panel includes an array substrate, a display medium layer, a filter substrate and a touch electrode layer. The array substrate includes a substrate and sub-pixel units. The filter substrate includes a filter layer. The filter layer includes color resists. Each of the color resists corresponds to each of the sub-pixels one by one and includes a first region, a second region and a third region. The touch electrode layer has a plurality of slits. The slits have normal projection areas A1, A2 and A3 over the first region, the second region and the third region. The first region, the second region and the third region have areas F1, F2, F3, respectively, and satisfy one of the relations of |(A1/F1)−[(A2+A3)/(F2+F3)]|<10%, |(A2/F2)−[(A1+A3)/(F1+F3)]|<10% or |(A3/F3)−[(A1+A2)/(F1+F2)]|<10%.