Organic Light-Emitting Panel Bank Wall Angles for Uniform Film Thickness
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Solution Overview
Problem
Existing organic light-emitting panel technologies face challenges in maintaining uniform film thickness across the entire panel due to difficulties in precisely forming minute convexities on bank surfaces, leading to uneven luminance.
Innovation Solution
The organic light-emitting panel incorporates a unique structure with varying inclination angles of bank walls to control the pinning location of ink, ensuring uniform film thickness by introducing a non-light-emitting cell between pixels and adjusting bank wall angles to compensate for non-uniform vapor concentration distribution during ink drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a convexity is provided on the surface of the bank to control the pinning location of ink, then uniform film thickness can be guaranteed to a certain degree, but it is difficult to form minute convexities with high precision across the entire panel
Solution Approach 1:
The patent applies local quality by varying the inclination angles of bank walls in different regions of the panel. Specifically, banks adjacent to non-light-emitting cells have different inclination angles compared to other banks, creating region-specific structures that compensate for local vapor concentration differences during ink drying, thereby achieving uniform film thickness across the entire panel without requiring high-precision convexity formation
Solution Approach 2:
The patent changes the geometric parameter of bank walls by adjusting inclination angles in different regions. By modifying the inclination angle parameter of banks adjacent to non-light-emitting cells versus other banks, the patent controls ink pinning locations to compensate for vapor concentration distribution differences, achieving uniform film thickness without complex manufacturing processes
2Productivity
If ink is dripped into each region partitioned by banks, then the organic light-emitting layer can be formed, but uneven film thickness occurs due to non-uniform vapor concentration distribution
Solution Approach 1:
The patent addresses the uneven film thickness problem by creating local quality differences in bank structures. Banks adjacent to non-light-emitting cells have different inclination angles compared to banks in light-emitting regions, which compensates for the non-uniform vapor concentration distribution that occurs during ink drying, thereby achieving uniform film thickness across the entire panel while maintaining high productivity
Solution Approach 2:
The patent applies preliminary anti-action by pre-configuring banks with different inclination angles in regions where vapor concentration differences are expected to occur. This preemptive structural adjustment counteracts the harmful effect of non-uniform vapor concentration distribution before ink dripping, preventing uneven film thickness formation while maintaining efficient production
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 approach effectively prevents uneven film thickness, resulting in excellent light-emitting characteristics with even luminance across the panel by optimizing ink pinning locations and vapor concentration distribution.
Implementation Method 1
progress has been made in the research and development of display devices that use the phenomenon of electroluminescence occurring in organic material. For driving the display device, holes are injected through the anode and electrons are injected through the cathode. Then, holes and electrons recombine in the organic light-emitting layer, and light is emitted.
Implementation Method 2
The organic light-emitting layer is formed by dripping ink that includes organic light-emitting material into each region partitioned by the banks and drying the ink.
Data Source
AI summary
A non-light-emitting cell 100c is provided between pixels 100a and 100b. Ink for forming an organic light-emitting layer is dripped substantially simultaneously into sub-pixels 100a1, 100a2, and 100a3 in the pixel 100a and a sub-pixel 100b1 in the pixel 100b. On the other hand, such ink is not dripped into the non-light-emitting cell 100c since the organic light-emitting layer is not formed in the non-light-emitting cell 100c. Regarding two banks 105c and 105d defining the sub-pixel 100a3, an inclination angle θd3 of a wall 105d3 of the bank 105d is larger than an inclination angle θc3 of a wall 105c3 of the bank 105c. Similarly, regarding banks 105e and 105f defining the sub-pixel 100b1, an inclination angle θe1 of a wall 105e1 of the bank 105e is larger than an inclination angle θf1 of a wall 105f1 of the bank 105f.