Touch Display Panel Grid Fracture Geometry for Color Uniformity
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Solution Overview
Problem
Conventional direct on thin film encapsulation (DOT) touch display panels experience color shift and uneven display due to differences in light reflection caused by fractures in the metal mesh structure, leading to sub-pixel light emission discrepancies.
Innovation Solution
A touch display panel design featuring a grid electrode with fractures that include acute angles and specific geometric configurations, such as concave and protruding sections, to minimize light leakage and maintain insulation between electrodes, thereby reducing color shift and uneven display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal mesh structure with fractures is used for touch sensing, then touch signal capture is achieved, but light reflection differences cause color shift and uneven display
Solution Approach 1:
The patent applies local quality by making the fracture geometry specific rather than arbitrary. The fracture is designed with a width of 2-5μm and length of 3-8μm, creating localized optical characteristics that differ from the surrounding metal mesh. This controlled local structure reduces light reflection differences between fractured and non-fractured regions, thereby minimizing color shift while preserving touch sensing functionality.
Solution Approach 2:
The patent employs parameter changes by optimizing the fracture dimensions (width: 2-5μm, length: 3-8μm) to achieve desired optical properties. By carefully controlling these geometric parameters, the light reflection characteristics of the fracture region are adjusted to match the surrounding areas, reducing color shift and display unevenness while maintaining touch signal capture capability.
2Illumination intensity
If the fracture width is reduced to minimize light leakage, then color shift is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a fracture width range of 2-5μm, which represents an optimized parameter setting that balances light leakage reduction with manufacturing feasibility. This parameter range is narrow enough to minimize color shift but wide enough to be manufacturable with standard precision capabilities, avoiding overly stringent requirements while achieving the desired optical performance.
Solution Approach 2:
The patent applies partial action by creating a fracture with specific dimensional constraints rather than complete separation. The fracture width of 2-5μm is sufficient to reduce light leakage and color shift but not so narrow as to require extreme manufacturing precision. This partial fracture approach achieves the necessary optical performance without excessive manufacturing complexity.
3Illumination intensity
If the fracture geometry is optimized to reduce color shift, then display uniformity improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing a specific fracture geometry (width: 2-5μm, length: 3-8μm) only at the fracture location rather than modifying the entire metal mesh structure. This localized geometric optimization reduces color shift and improves display uniformity without requiring complex changes to the overall device architecture, thereby limiting the increase in device complexity to only the necessary local modifications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces light leakage through the fractures, minimizing color shift and uneven display by optimizing the geometric arrangement of the grid electrode, ensuring consistent light emission across the display panel.
Implementation Method 1
the fracture region does not reflect light, and the other regions of the metal mesh in addition to the fracture region easily reflect light
Data Source
AI summary
A touch display panel is provided. The angle between an opening direction of a fracture and a grid line of a grid of a grid electrode in the present application is arranged to be acute an angle, so that the opening direction of the fracture is not perpendicular to the grid line of the grid of the grid electrode, and the opening of the fracture is narrowed, thereby reducing a light leakage of a plurality of sub-pixels located in the grid, which reduces a display panel color shift, and thus reducing a problem of uneven display caused by the display panel color shift.