OLED Display Substrate Barrier Recessed Structures Crosstalk
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Solution Overview
Problem
OLED display substrates suffer from crosstalk issues where sub-pixels of other colors are slightly bright when displaying red, green, or blue single-color pictures due to current leakage between adjacent pixels, especially at high pixel densities.
Innovation Solution
The display substrate incorporates a barrier layer with recessed structures between sub-pixel areas, which are matched by corresponding recessed structures in the common layer, increasing the current path length and impedance, thereby reducing crosstalk by converting direct joint connections into a geometric design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased to improve display resolution, then display quality is improved, but crosstalk between adjacent sub-pixels increases causing color accuracy to deteriorate
Solution Approach 1:
The barrier layer is segmented into multiple isolated barrier portions arranged in arrays between adjacent sub-pixel areas. Each barrier portion acts as an independent isolation unit, creating multiple discrete barriers that collectively prevent current leakage while maintaining high pixel density. The barrier portions are separated by gaps that allow light transmission but block current paths.
Solution Approach 2:
The barrier layer provides localized isolation properties specifically at the interfaces between adjacent sub-pixel areas, while the rest of the OLED structure maintains uniform high-quality materials for light emission. The barrier portions are strategically positioned only where current leakage occurs, creating local electrical isolation without affecting the overall optical performance of the display.
2Object-affected harmful factors
If barrier structures are added to reduce crosstalk, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The barrier layer serves multiple functions simultaneously: it provides electrical isolation between adjacent sub-pixels to prevent crosstalk, maintains the structural integrity of the OLED device, and allows light transmission from the emitting sub-pixels. The same barrier portions that block current also serve as structural support elements, eliminating the need for separate isolation structures.
Solution Approach 2:
The barrier portions are merged with the common layer structure, forming an integrated barrier layer that combines the isolation function with the existing OLED architecture. The barrier portions are formed as part of the common layer deposition process, merging the isolation function with the electrode structure rather than adding a completely separate component layer.
Data Source
AI summary
Provided are a display substrate and a display apparatus. The display substrate includes: a base substrate, and a first electrode layer, a barrier layer and a common layer, which are sequentially located on one side of the base substrate, wherein the first electrode layer includes a plurality of first electrodes located in sub-pixel areas; the barrier layer includes a plurality of barrier portions used for defining the sub-pixel areas; the common layer covers the barrier portions and the first electrodes; a barrier portion located between two sub-pixel areas which are at least partially adjacent is provided with at least one first recessed structure; and the common layer is provided with a second recessed structure in an area corresponding to the first recessed structure.