OLED Display Substrate Blocking Layer for Pixel Crosstalk
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Solution Overview
Problem
Crosstalk occurs between adjacent pixels in OLED display devices due to overlapping organic light-emitting layers during the evaporation process, affecting the display effect.
Innovation Solution
Incorporating an insulating blocking layer between overlapping areas of adjacent organic light-emitting layers to prevent the flow of holes between pixels, ensuring that one pixel does not illuminate another when activated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the distance between sub-pixels is decreased to improve pixel density, then the pixel definition layer gap becomes smaller, but crosstalk occurs between adjacent pixels due to overlapping organic light-emitting layers
Solution Approach 1:
An insulating blocking layer is introduced as an intermediary between adjacent organic light-emitting layers. This blocking layer physically separates the overlapping regions of adjacent sub-pixels, preventing hole transport across pixel boundaries while maintaining the reduced pitch structure. The blocking layer acts as a mediator that allows high pixel density to be achieved without suffering from crosstalk effects.
2Manufacturing precision
If the pixel definition layer gap is reduced to increase resolution, then more sub-pixels can be packed, but the organic light-emitting layers overlap more, causing unintended illumination
Solution Approach 1:
The harmful overlapping region is extracted and isolated by introducing a blocking layer specifically in the overlapping area. The blocking layer removes the problematic hole transport path between adjacent pixels while preserving the functional organic light-emitting layers. This extraction approach allows the structure to maintain high pixel definition while eliminating the source of unintended illumination.
3Reliability
If a blocking layer is added to prevent crosstalk, then pixel isolation is improved, but the device structure becomes more complex
Solution Approach 1:
The blocking layer is applied locally only in the overlapping regions between adjacent sub-pixels, rather than uniformly across the entire device. This localized approach provides effective pixel isolation where needed while minimizing the overall structural complexity and material usage. The blocking layer's presence is confined to specific critical areas, maintaining simplicity in non-critical regions.
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
Prevents crosstalk between adjacent pixels, maintaining the display effect by blocking hole transport between overlapping layers, thereby enhancing pixel isolation.
Implementation Method 1
an insulating blocking layer is provided between the first organic light-emitting layer and the second organic light-emitting layer
Data Source
AI summary
Provided are a display substrate and a related device, belonging to the technical field of display. The display substrate includes a first sub-pixel and a second sub-pixel provided on a base substrate and having different colors. An orthographic projection of a first organic light-emitting layer of the first sub-pixel and an orthographic projection of a second organic light-emitting layer of the second sub-pixel onto the base substrate have an overlapping area, an insulating blocking layer is provided between the first organic light-emitting layer and the second organic light-emitting layer, and an orthographic projection of the blocking layer onto the base substrate covers at least part of the overlapping area. The technical solution of the present disclosure can prevent crosstalk between adjacent pixels.