Mesh Metal Touch Display Panel Eliminating Moire Interference
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Solution Overview
Problem
Conventional touch display panels face issues with high resistance and high cost due to the use of transparent conductive materials, and they often suffer from the Moire effect and visual grid patterns caused by interference between the light shielding pattern layer and the mesh touch pads, leading to poor visual and touch sensitivity performance.
Innovation Solution
A touch display panel design featuring a mesh metal structure with fine metal lines forming touch pads, where the grid patterns have specific shapes and edge lengths, and angles relative to the pixel edges, minimizing interference with the light shielding pattern layer to avoid the Moire effect and enhance transmittance, sensitivity, and visual quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductive material is used to form touch pads, then transmittance is improved, but resistance and cost increase
Solution Approach 1:
The patent changes the material parameter from transparent conductive material to metal material, and changes the structural parameter by forming a mesh pattern with specific line widths (0.1-10 μm) and grid dimensions. This parameter transformation maintains high transmittance while achieving lower resistance and reduced cost.
Solution Approach 2:
The patent applies different properties to different parts of the touch pad structure. The mesh pattern has varying line widths and grid densities in different regions, optimizing both transmittance and conductivity locally. The fine metal lines provide conductive paths while maintaining optical transparency in the spaces between them.
2Reliability
If mesh touch pads are used to reduce resistance, then sensitivity is improved, but Moire effect and visual grid patterns occur due to interference with light shielding pattern layer
Solution Approach 1:
The patent introduces asymmetry by designing the mesh pattern with specific angular orientations (0°, 25°-65°) relative to the pixel edges, rather than using a symmetric grid aligned with the pixel structure. This asymmetric angular design breaks the periodic interference pattern that causes Moire effects, while maintaining the sensitivity benefits of the mesh structure.
Solution Approach 2:
The patent carefully controls the geometric parameters of the mesh pattern, including line width (0.1-10 μm), grid edge length (1/8 to 3/5 of pixel edge length), and angular orientation. By optimizing these parameters, the mesh pattern achieves high sensitivity while minimizing visual interference with the light shielding pattern layer.
3Illumination intensity
If fine metal lines are used to form mesh touch pads, then transmittance and sensitivity are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the continuous conductive layer into a discrete mesh pattern of fine lines. This segmentation allows the use of standard manufacturing processes while achieving the optical and electrical performance of finer structures. The mesh configuration distributes the manufacturing tolerance across multiple segments rather than requiring perfect precision in a single continuous layer.
Solution Approach 2:
The patent specifies optimal parameter ranges for the mesh pattern (line width 0.1-10 μm, grid edge length 1/8 to 3/5 of pixel edge length, angles 0° or 25°-65°) that balance transmittance performance with manufacturability. These parameter ranges are chosen to be achievable with conventional fabrication processes while maintaining the desired optical and electrical properties.
Data Source
AI summary
A touch display panel including a first substrate, a second substrate, a light shielding pattern layer, a touch sensing layer and a display medium is provided. The light shielding pattern layer is disposed on the first substrate or the second substrate. Pixel units are defined by the light shielding pattern layer, each pixel unit has a pixel edge length, and each pixel unit is disposed corresponding to one of the pixel structures. The touch sensing layer is disposed on the second substrate and has a plurality of first touch series and a plurality of second touch series. Each first touch series and each touch series respectively have mesh touch pads serially connected to each other. Each mesh touch pad has a plurality of grid patterns, each grid pattern has a grid edge length, and the grid edge length is ⅛˜⅗ of the pixel edge length.