Half-Bank OLED Display Structure to Reduce Light Escape
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Solution Overview
Problem
The light-escaping phenomenon occurs in organic light emitting display devices due to the overlapping arrangement of the bank and cathode electrode, causing user inconvenience and reducing light efficiency.
Innovation Solution
A display device with a half-bank structure is implemented, where the bank is omitted from the light emitting region, and the anode electrode is designed not to overlap with data or sensing lines, enhancing light efficiency by preventing light loss in non-light-emitting regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bank and cathode electrode are arranged in an overlapping manner, then the device structure is simplified, but light-escaping phenomenon occurs causing user inconvenience
Solution Approach 1:
The patent extracts and removes the bank structure from the light-emitting region, creating a half-bank structure where the bank is only present in the non-light-emitting region. This extraction eliminates the overlapping arrangement between bank and cathode electrode in the light-emitting region, thereby preventing the light-escaping phenomenon while maintaining structural simplification.
Solution Approach 2:
The patent segments the bank structure into two distinct regions: a light-emitting region without bank and a non-light-emitting region with bank. This segmentation allows the device to have different structural characteristics in different regions, preventing light escape in the light-emitting region while maintaining the protective and structural functions of the bank in the non-light-emitting region.
2Device complexity
If the bank is present in the light emitting region, then the device structure is more complete, but light efficiency is reduced due to light loss
Solution Approach 1:
The patent extracts the bank structure from the light-emitting region where it would cause light loss, while retaining it in the non-light-emitting region. This selective extraction eliminates the source of light efficiency reduction without compromising the overall device structure, thereby resolving the contradiction between structural completeness and light efficiency.
Solution Approach 2:
The patent applies different structural qualities to different regions: the light-emitting region has no bank to maximize light efficiency, while the non-light-emitting region retains the bank for structural support and protection. This local differentiation optimizes each region's function, preventing light loss where it matters while maintaining structural integrity.
3Device complexity
If the anode electrode overlaps with data wiring lines, then the device layout is simplified, but light efficiency is reduced due to light loss in non-light-emitting regions
Solution Approach 1:
The patent segments the device into light-emitting and non-light-emitting regions, and positions the anode electrode to overlap with data wiring lines only in the non-light-emitting region. This spatial segmentation allows the electrode layout to be simplified through overlapping arrangements while preventing light loss, since the overlapping occurs only where light is not emitted.
Solution Approach 2:
The patent applies different layout qualities to different regions: in the non-light-emitting region, the anode electrode overlaps with data wiring lines to simplify layout and reduce device complexity, while in the light-emitting region, the electrode positioning is optimized to prevent light loss. This local differentiation resolves the contradiction between layout simplicity and light efficiency.
Data Source
AI summary
A display device includes a substrate, a circuit element layer and a bank region. The substrate includes a light emitting region and a non-light-emitting region. The light emitting region forms an opening region. The non-light-emitting region is adjacent to the light emitting region. The circuit element layer is formed in the non-light-emitting region. The bank layer covers a top of the circuit element layer. The bank layer is not formed in the light emitting region.