OLED Pixel Defining Layer Hole Blocking Structure
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Solution Overview
Problem
As the resolution of OLED display panels increases, the proximity of light emitting units leads to increased transverse current and crosstalk, causing light leakage between adjacent pixels, which reduces display quality, especially under low current conditions.
Innovation Solution
Incorporating a hole blocking portion above the spacing portions of the pixel defining layer to separate the first common layer between adjacent sub-pixel areas, preventing hole leakage and using a hole blocking material solution that dissolves and separates the first common layer during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of OLED display panels increases and intervals between light emitting units decrease, then display resolution is improved, but transverse current increases causing light leakage between adjacent pixels
Solution Approach 1:
The first common layer is segmented into isolated islands positioned over each light emitting unit, separated by insulating layers and openings. This segmentation prevents the formation of continuous transverse current paths between adjacent pixels, thereby eliminating light leakage while maintaining high display resolution
Solution Approach 2:
The harmful continuous conductive path of the first common layer is extracted and removed between adjacent light emitting units through openings and insulating layers. Only the necessary portions over each individual light emitting unit are retained, eliminating the source of transverse current while preserving hole transport function
2Productivity
If excellent transport materials are introduced to the first common layer to improve hole transfer performance, then hole transfer efficiency is improved, but transverse current increases causing crosstalk between adjacent light emitting units
Solution Approach 1:
The high-performance transport material in the first common layer is segmented into isolated islands over each light emitting unit, preventing lateral spread of holes to adjacent units. This maintains efficient hole transport vertically while eliminating horizontal crosstalk through the insulating barriers
Solution Approach 2:
The first common layer is configured with different properties in different locations: high hole transport performance over each light emitting unit using excellent transport materials, and complete insulation between units through openings and insulating layers. This local differentiation achieves both efficient transport and crosstalk elimination
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
Effectively eliminates light leakage between adjacent sub-pixels, enhancing the display quality of OLED display panels by preventing hole transfer between adjacent areas.
Implementation Method 1
a hole blocking portion is further disposed above the spacing portion, and the hole blocking portion spaces the first common layer between two adjacent sub-pixel areas
Implementation Method 2
using a hole blocking material solution that dissolves and separates the first common layer during the manufacturing process
Data Source
AI summary
The present disclosure discloses an OLED display panel, including a TFT array substrate and a plurality of anodes disposed in an array on the TFT array substrate, the TFT array substrate has a pixel defining layer disposed thereon, the pixel defining layer includes opening portions and spacing portions, and each opening portion corresponds to one sub-pixel area; wherein, the pixel defining layer has a first common layer, a second common layer and a cathode layer sequentially disposed thereon, and a light emitting material is disposed between the first common layer and the second common layer corresponding to each sub-pixel area; wherein, a hole blocking portion is further disposed above the spacing portion, and the hole blocking portion spaces the first common layer between two adjacent sub-pixel areas. The present disclosure further discloses a method for manufacturing the OLED display panel as mentioned above.