Separator-Isolated Display Electrodes for Electrical Reliability
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Solution Overview
Problem
Existing display panels suffer from afterimage defects and reduced lifespan due to electrical reliability issues in the connection of light emitting elements and circuits.
Innovation Solution
A display panel design that includes a transistor, a light emitting element with a first and second electrode separated by a separator, and a sensing electrode, with connection wiring and bridge patterns to improve electrical insulation and reduce afterimage defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second electrode is electrically connected to the transistor without proper separation, then the connection is simple, but afterimage defects occur and electrical reliability deteriorates
Solution Approach 1:
The patent introduces a separator that divides the second electrode into multiple independently controlled portions (first, second, and third second electrodes). This segmentation allows each portion to be electrically isolated from the transistor, preventing the afterimage defect while maintaining the overall structural integrity of the light emitting element.
Solution Approach 2:
The separator acts as an intermediary element positioned between the second electrode and the transistor. This intermediary structure provides electrical insulation and spatial separation, ensuring that the second electrode portions remain electrically disconnected from the transistor during operation, thereby improving electrical reliability.
2Measurement precision
If the sensing electrode is closely positioned for detection, then sensing accuracy improves, but electrical interference with the light emitting element increases
Solution Approach 1:
The patent positions the sensing electrode in a different spatial dimension relative to the light emitting element by placing it on a separate substrate layer. This dimensional separation allows the sensing electrode to be closely positioned for accurate detection while maintaining electrical isolation through the substrate barrier, preventing interference with the light emitting element.
Solution Approach 2:
The substrate serves as an intermediary barrier between the sensing electrode and the light emitting element. This intermediary structure enables close proximity for effective sensing while providing electrical insulation that prevents harmful electrical interference from the sensing electrode affecting the light emitting element operation.
3Productivity
If the light emitting element operates continuously, then productivity is maintained, but lifespan decreases due to deterioration
Solution Approach 1:
The patent segments the second electrode into multiple independently controllable portions that can be selectively activated. This segmentation enables the light emitting element to operate in a segmented manner, allowing continuous operation of the display while reducing the operational stress on any single light emitting element, thereby extending its lifespan.
Solution Approach 2:
The patent implements periodic control of the second electrode portions through the driving circuit, where different portions are activated in sequence rather than all simultaneously. This periodic action pattern allows continuous display operation while distributing the operational load over time, reducing cumulative deterioration and extending the lifespan of the light emitting element.
Data Source
AI summary
A display panel includes a transistor, a light emitting element, a pixel defining layer, a separator, and a sensing electrode. The light emitting elements includes a first electrode, an intermediate layer disposed on the first electrode, and a second electrode disposed on the intermediate layer. The second electrode is electrically connected to the transistor. The pixel defining film is disposed on the first electrode and defines an emission opening above the first electrode. The separator is disposed on the pixel defining film. The sensing electrode is disposed on the separator. The sensing electrode and the second electrode are electrically separated by the separator.