Organic Light-Emitting Panel Bank Sidewall Angles
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Solution Overview
Problem
It is challenging to maintain a uniform film thickness of the organic light-emitting layer across an organic light-emitting panel due to difficulties in precisely detecting and adjusting the convexities on the inner sidewalls of the banks, leading to uneven luminance.
Innovation Solution
The organic light-emitting panel is designed with a structure where the inner sidewalls of adjacent banks defining each light-emitting cell have different inclination angles, allowing for precise adjustment of the pinning location of the ink during manufacturing, which in turn controls the film thickness of the organic light-emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a convexity is provided on the inner sidewall of the bank to control the pinning location of the ink, then the film thickness uniformity is improved to a certain degree, but it is difficult to detect in advance how the organic light-emitting layer is uneven in film thickness and form a minute convexity for each region with high precision
Solution Approach 1:
The invention applies different inclination angles to different regions of the bank sidewalls based on the local characteristics of each light-emitting cell. By making the inclination angle of the sidewall larger in regions where the organic light-emitting layer tends to be thinner and smaller in regions where it tends to be thicker, the pinning location of the ink is locally adjusted to achieve uniform film thickness across the entire panel.
Solution Approach 2:
The invention performs preliminary action by pre-forming the bank sidewalls with specifically designed inclination angles before the ink deposition process. This preliminary structuring of the banks with varying inclination angles prepares the pinning locations in advance, allowing the ink to naturally form a uniform film thickness without requiring complex real-time detection and adjustment systems.
2Manufacturing precision
If the inclination angles of the bank sidewalls are adjusted to control pinning location, then the film thickness uniformity is improved, but the device complexity increases
Solution Approach 1:
The invention changes the geometric parameter of the bank sidewalls (inclination angle) to control the pinning location of the ink. By adjusting the inclination angle parameter of the bank sidewalls, the film thickness uniformity of the organic light-emitting layer is improved without requiring complex additional components or mechanisms.
3Illumination intensity
If the film thickness of the organic light-emitting layer is made uniform across the panel, then the luminance uniformity is improved, but the manufacturing process becomes more difficult
Solution Approach 1:
The invention employs the self-service principle by utilizing the natural capillary action and pinning effect of the ink on the bank sidewalls. The ink automatically pins to the sidewalls at locations determined by the inclination angles, and this self-organizing behavior during the drying process naturally produces uniform film thickness without requiring complex external control mechanisms or multiple manufacturing steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This structure ensures a uniform film thickness across the panel, preventing unevenness and enhancing light-emitting characteristics by adjusting the pinning location based on the inclination angle of the bank sidewalls.
Implementation Method 1
The organic light-emitting layer is formed by dripping ink, which includes an organic light-emitting material, into each region separated by the banks and drying the ink
Data Source
AI summary
A pixel in the panel includes sub-pixels 100a, 100b, and 100c. Bank 105a separates organic light-emitting layer of sub-pixel 100a and organic light-emitting layer of a sub-pixel of a pixel that is adjacent to sub-pixel 100a. Bank 105d separates organic light-emitting layer of sub-pixel 100c and organic light-emitting layer of a sub-pixel of a pixel that is adjacent to sub-pixel 100c. Bank 105b separates organic light-emitting layer of sub-pixel 100a and organic light-emitting layer of sub-pixel 100b. Bank 105c separates organic light-emitting layer of sub-pixel 100b and organic light-emitting layer of sub-pixel 100c. Inclination angle θcb of sidewall 105cb of bank 105c located on the side of sub-pixel 100c is set to be larger than other inclination angles θaa, θba, θbb, θcc and θdc.