OLED Touch Display Panel With Segmented Metal Mesh Sensor
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Solution Overview
Problem
Current touch control materials, such as ITO and metal meshes, are not suitable for large-size screens as they affect optical performance and impedance control, leading to reduced luminance and interference patterns.
Innovation Solution
An organic light-emitting diode (OLED) touch display panel with a molybdenum mesh touch sensor pattern layer aligned between subpixels, which does not overlap the pixel areas, allowing for improved optical performance and reduced impedance by integrating the touch sensor with encapsulation glass and a polarizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO touch control sensor is used to cover the whole pixel layer, then touch control function is achieved, but optical performance deteriorates and resistance control becomes difficult
Solution Approach 1:
The touch sensor is segmented into a grid pattern with conductive lines arranged in rows and columns, rather than using a continuous ITO layer. This segmentation allows light to pass through the gaps between lines, improving optical performance while maintaining touch control functionality through the conductive grid structure.
Solution Approach 2:
The touch sensor structure uses different materials and configurations in different regions: metal mesh or conductive oxide patterns in specific areas, combined with transparent conductive layers. This local differentiation optimizes both optical performance in pixel areas and electrical conductivity in touch sensing areas.
2Reliability
If metal mesh sensor is used to cover the whole pixel layer, then touch control function is achieved, but luminance is reduced and interference patterns are generated
Solution Approach 1:
The metal mesh is segmented into fine conductive lines arranged in a grid pattern with small line widths and optimized spacing. This segmentation reduces the total metal area covering the pixel layer, minimizing light blockage and interference patterns while maintaining sufficient conductivity for touch control.
Solution Approach 2:
The metal mesh parameters (line width, spacing, mesh density) are optimized to balance electrical conductivity and optical performance. By adjusting these parameters, the system achieves adequate touch sensing capability while minimizing impact on luminance and eliminating interference patterns.
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 solution enhances optical performance by preventing light blockage and maintaining even brightness across different color subpixels, while reducing impedance and enabling effective touch control on large screens.
Implementation Method 1
a pixel layer including a plurality of red subpixels 110, a plurality of green subpixels 120, and a plurality of blue subpixels 130
Data Source
AI summary
An OLED touch display panel includes a pixel layer having red subpixels, green subpixels, and blue subpixels. The red subpixels, the green subpixels, and the blue subpixels are arranged in a repeated manner. An encapsulation glass is mounted on the pixel layer. A touch sensor pattern layer is formed on the encapsulation glass and is aligned with gaps between the red subpixels, the green subpixels, and the blue subpixels. In another aspect, an OLED touch display panel includes a pixel layer having subpixels of different colors. An encapsulation glass is mounted on the pixel layer in a first direction. A polarizer is mounted on the encapsulation glass in the first direction. A touch sensor pattern layer is mounted between the encapsulation glass and the polarizer. At least a portion of spacing sections between the subpixels overlaps a pattern of the touch sensor pattern layer in the first direction.