Display Panel Barrier Portion for Touch Electrode Yield
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Solution Overview
Problem
The existing OLED display panel manufacturing process faces challenges in maintaining the line width and integrity of touch electrodes adjacent to the Camera Under Panel (CUP) area due to excessive etching solution usage, leading to reduced yield and potential fractures.
Innovation Solution
A display panel design featuring a barrier portion insulated from the touch portion, positioned between the touch layer and the opening in the functional display area, acts as a buffer to prevent etching solution from reaching the touch layer, thereby increasing the yield of the touch electrode and the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the touch layer is removed from the CUP area to improve light transmittance, then the light transmittance and imaging effect are improved, but the touch layer structure becomes more complex and manufacturing difficulty increases
Solution Approach 1:
The touch layer is selectively removed only from the CUP area while being retained in other display areas. This local modification approach improves light transmittance where needed (in the CUP area) while maintaining touch functionality in other regions, avoiding the need to completely remove the touch layer from the entire panel.
Solution Approach 2:
The display panel is divided into different functional areas: the CUP area where the touch layer is removed to improve light transmittance, and other areas where the touch layer is retained. This segmentation allows different regions to have different structural characteristics optimized for their specific functions.
2Illumination intensity
If more metal in the touch layer is removed from the CUP area, then the light transmittance is improved, but the etching solution causes excessive etching of adjacent touch electrodes, reducing manufacturing precision
Solution Approach 1:
An intermediate protective structure is introduced around the CUP area to act as a barrier between the etching solution and the adjacent touch electrodes. This intermediary structure prevents the etching solution from excessively etching the touch electrodes while still allowing the CUP area to be properly etched for improved light transmittance.
Solution Approach 2:
The protective structure is formed in advance before the etching process to preemptively prevent the harmful effect of excessive etching. By establishing this protective barrier beforehand, the touch electrodes are shielded from the etching solution, ensuring manufacturing precision is maintained during the etching process.
3Illumination intensity
If the touch layer is partially removed to improve light transmittance, then the imaging effect is improved, but the yield is reduced due to etching damage to adjacent touch electrodes
Solution Approach 1:
The protective structure serves as an intermediary that isolates the etching process in the CUP area from the adjacent touch electrodes. This prevents etching-induced damage that would otherwise reduce yield, while still achieving the desired light transmittance improvement through selective removal of the touch layer in the CUP area.
Solution Approach 2:
The protective structure is formed in advance to cushion or protect the touch electrodes from the harmful effects of the etching solution. This preliminary protective measure ensures that the etching process can proceed without damaging the adjacent touch electrodes, thereby maintaining high manufacturing yield.
Data Source
AI summary
The present application discloses a display panel and a display device. The display panel includes a functional display area and a conventional display area. The display panel further includes a substrate, a light-emitting layer and a touch layer sequentially disposed on the substrate. The touch layer includes an opening disposed in the functional display area, a barrier portion disposed around the opening, and a touch portion located on a side of the barrier portion away from the opening; wherein at least a part of the barrier portion is disposed in the functional display area.