OLED Touch Mesh Layout to Reduce Boundary Mura Defects
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Solution Overview
Problem
The existing touch control structures in flexible OLED displays face challenges in achieving optimal sensitivity and resistance while maintaining the advantages of metal mesh electrodes, such as low resistance and fast response speed, due to limitations in design and arrangement of touch control layers.
Innovation Solution
A display panel design incorporating a touch control structure layer with a stacked arrangement of a bridge layer, insulating layer, and touch control layer, featuring mesh pattern units with specific cuts and orientations to disconnect metal wires, allowing for alternating touch control electrodes and connecting parts, which improves sensitivity and reduces resistance by optimizing the arrangement of cuts and electrode configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal mesh is used for touch control electrodes to reduce resistance and improve response speed, then electrical performance is improved, but the visibility of cuts and mura defects increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of mesh patterns in different regions: the Boundary region receives cuts to separate first and second touch control electrodes, while the Bulk region maintains continuous mesh patterns. This localized differentiation allows the Boundary region to achieve electrical isolation and reduced mura defects, while the Bulk region preserves low resistance and fast response characteristics, thus resolving the contradiction between touch control sensitivity and visibility of defects.
2Object-affected harmful factors
If cuts are added to disconnect metal wires in mesh pattern units, then mura defects are reduced, but resistance increases and sensitivity decreases
Solution Approach 1:
The patent segments the display panel into two distinct regions: the Boundary region where cuts are applied to disconnect metal wires and eliminate mura defects, and the Bulk region where mesh patterns remain continuous to maintain low resistance. This segmentation strategy allows the harmful effects of cuts (increased resistance) to be confined to a minimal area, while the majority of the touch control structure retains optimal electrical performance.
3Area of stationary object
If mesh pattern units are arranged to cover subpixel boundaries, then touch control coverage is improved, but cut visibility and mura defects increase
Solution Approach 1:
The patent implements local quality by restricting cuts to the Boundary region where mesh pattern units are positioned at subpixel boundaries, while maintaining continuous mesh patterns in the Bulk region covering the central areas of subpixels. This localized approach ensures that cuts are confined to regions where they are least visible and have minimal impact on overall touch control coverage, thus resolving the contradiction between coverage area and cut visibility.
Data Source
AI summary
A display panel, a touch control structure and a display device. The display panel includes a display structure layer and a touch control structure layer having a plurality of mesh pattern units in polygonal shapes composed of metal wires. The touch control structure layer includes a Boundary region, and each mesh pattern unit in the Boundary region is provided with a cut that disconnect the metal wires of the mesh pattern unit. The mesh pattern unit includes at least two parallel first sides. The cuts include consecutive cuts and the quantity of cuts in a set of consecutive cuts is less than or equal to three. The consecutive cuts are cuts provided on both the two sides of each mesh pattern unit of at least one mesh patterns units arranged continuously in a first direction and the first direction intersects the first side of each mesh pattern unit.