Display Panel Touch Bridges Around Through-Holes to Reduce Disconnections
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Solution Overview
Problem
Display panels with through-holes in the display region experience poor touch performance due to morphological fluctuations in the encapsulation layer, leading to narrower line widths and disconnection risks in bridge lines formed by photolithography.
Innovation Solution
The display panel design includes a first touch unit surrounding the through-hole with multiple bridge units connected between first electrodes, ensuring electrical connection performance and reducing disconnection risks by avoiding regions of large morphological fluctuations in the encapsulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography is used to form bridge lines in the encapsulation layer, then the bridge lines can be precisely formed, but the line widths become narrower and disconnection risks increase due to morphological fluctuations
Solution Approach 1:
The patent introduces a Z-direction offset between the first electrode pattern and the bridge line pattern, moving the bridge lines to a different spatial dimension (depth layer) relative to the electrodes. This dimensional separation allows the bridge lines to bypass the morphological fluctuation regions in the encapsulation layer that affect the electrode areas, thereby maintaining connection reliability while preserving photolithography precision.
Solution Approach 2:
The patent applies different spatial positioning strategies to different components: the first electrode pattern is positioned at a first depth layer while the bridge line pattern is positioned at a second depth layer with an offset in the Z-direction. This local differentiation in positioning ensures that bridge lines avoid the problematic morphological fluctuation regions that affect electrode areas, solving the reliability issue without compromising manufacturing precision.
2Device complexity
If the bridge line is disposed in the same layer as the first electrode, then the structure is simpler, but the touch effect around the through-hole deteriorates due to morphological fluctuations
Solution Approach 1:
The patent resolves the contradiction by utilizing the Z-dimension (depth layer) to separate the bridge line pattern from the first electrode pattern. Instead of keeping them in the same layer (which would maintain simplicity but degrade touch effect), the bridge lines are positioned at a different depth with a Z-direction offset. This dimensional separation improves touch effect quality by avoiding morphological fluctuations while accepting increased structural complexity.
3Reliability
If multiple bridge units are used to surround the through-hole, then the electrical connection reliability is improved, but the device complexity increases
Solution Approach 1:
The patent divides the bridge connection function into multiple bridge units (first bridge unit and second bridge unit) that are spatially separated and positioned at different depth layers. This segmentation approach improves electrical connection reliability by providing redundant connection paths around the through-hole, while the systematic arrangement of these segments maintains manageable device complexity.
Solution Approach 2:
The patent uses Z-direction offset to position different bridge units at different depth layers, creating a three-dimensional connection network around the through-hole. This dimensional approach to segmentation enhances connection reliability through spatial redundancy while organizing the complexity in a structured manner that is easier to manufacture and control.
Data Source
AI summary
A display panel and a display apparatus are described. The display panel includes a plurality of touch units. The touch units include first electrodes and second electrodes that are disposed in a same layer. Adjacent first electrodes along a first direction are connected through a bridge line, and adjacent second electrodes along a second direction are connected through a connecting line. The bridge line is disposed in a different layer from the first electrode, and the connecting line is disposed in a same layer as the second electrode. A display region has a through-hole, and the touch units include a first touch unit that at least partially surrounds the through-hole. The first touch unit includes at least two bridge units, the bridge unit is connected to two adjacent first electrodes along the first direction, and the bridge unit includes at least one bridge line.