Display Electrode-Bank Spacing for Short-Circuit-Free Luminance
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Solution Overview
Problem
Existing display devices face challenges in enhancing the yield of display panels while improving luminance and efficiency.
Innovation Solution
A display device design that includes a base layer, a first electrode, a bank, a light emitting element with a coupling electrode layer, and a second electrode, where the first electrode and the bank are spaced apart to prevent short circuits and enhance the coupling force between the light emitting element and the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the first electrode and the bank are positioned close to each other to maximize the emission area, then the luminance and efficiency are improved, but the risk of short circuit between the light emitting element and the bank increases
Solution Approach 1:
An insulating layer is introduced between the first electrode and the bank to prevent direct contact and short circuit. This intermediary layer allows the electrode and bank to be positioned close together for maximum emission area while maintaining electrical isolation, thus resolving the contradiction between luminance enhancement and short circuit prevention.
Solution Approach 2:
The insulating layer is formed in advance during the manufacturing process before the light emitting element is assembled. This preliminary action ensures that the protective insulation is already in place, preventing short circuits before they can occur while allowing optimal positioning of the electrode and bank for maximum luminance.
2Reliability
If the first electrode is made thicker to improve electrical connection stability, then the reliability is enhanced, but the overall device height and complexity increase
Solution Approach 1:
The first electrode is constructed as a composite structure with multiple layers of different materials, each contributing specific properties. This composite approach provides stable electrical connection through optimized material combinations while maintaining a compact overall thickness, avoiding the need for excessive single-layer thickness that would increase device height.
3Productivity
If the distance between the first electrode and the bank is reduced to increase the emission area, then the productivity and yield are improved, but the manufacturing precision requirements become more stringent
Solution Approach 1:
The insulating layer serves as a buffer that decouples the positioning requirements between the first electrode and the bank. By providing a fixed thickness insulating barrier, it allows greater tolerance in positioning while maintaining the required minimum distance, thus reducing manufacturing precision requirements and improving yield.
Solution Approach 2:
The thickness of the insulating layer is optimized to provide adequate electrical isolation while minimizing the space consumed. This parameter optimization allows the electrode and bank to be positioned closer together without compromising reliability, thereby increasing the emission area and improving productivity and yield.
Data Source
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AI summary
A display device includes a base layer; a first electrode located over the base layer; a bank located over the base layer; a light emitting element comprising a coupling electrode layer located over the first electrode; and a second electrode located over the light emitting element. The first electrode and the bank are spaced apart from each other.