OLED Black Matrix Open Areas for Pixel Repair and Light Shielding
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Solution Overview
Problem
OLED panels face challenges in repairing malfunctioning pixels and maintaining electric properties due to the uneven surface of the black matrix, which affects the emission direction and transistor performance.
Innovation Solution
Incorporating a black matrix with open areas that expose conductive and low reflective layers, allowing for easier pixel repair and improved electric properties by acting as markers for repair locations and shielding external light, thereby preventing deterioration of semi-conductive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is used to block external light in OLED panels, then light shielding performance is improved, but the surface becomes uneven causing difficulty in specifying repair locations and deteriorating transistor electric properties
Solution Approach 1:
The black matrix is segmented by forming open areas (first open areas and second open areas) at specific locations. These openings divide the continuous black matrix structure, allowing light to pass through at designated spots while maintaining shielding in other areas. This segmentation enables repair location identification without completely compromising the light blocking function.
Solution Approach 2:
The black matrix is designed with non-uniform properties: most areas maintain light-blocking characteristics while specific localized regions (open areas) have light-transmitting properties. The first open areas are positioned for repair location identification and the second open areas for transistor electric property improvement, creating local quality variations that address different functional requirements.
2Object-affected harmful factors
If a black matrix is used to block external light in OLED panels, then light shielding performance is improved, but transistor electric properties deteriorate due to uneven surface
Solution Approach 1:
The black matrix structure is segmented by creating second open areas positioned over transistor regions. These openings interrupt the continuous uneven surface of the black matrix, preventing the propagation of surface irregularities to the transistor structures beneath, thereby protecting transistor electric properties while maintaining overall light shielding.
Solution Approach 2:
The open areas in the black matrix act as intermediary regions that decouple the uneven surface effect from the transistor structures. By providing open spaces between the black matrix and transistors, the harmful uneven surface influence is blocked, serving as a mediator that protects transistor reliability.
3Illumination intensity
If the black matrix surface is made uneven to improve light emission direction control, then emission directionality is improved, but repair difficulty increases due to inability to specify repair locations
Solution Approach 1:
The black matrix is segmented with first open areas positioned at repairable pixel locations. These segmented openings create visible reference points that do not interfere with the overall emission directionality control provided by the remaining black matrix structure, enabling repair location identification.
Solution Approach 2:
The black matrix exhibits local quality variation: most regions maintain the uneven surface configuration for emission directionality control, while specific localized regions contain open areas that provide repair location markers. This local differentiation allows simultaneous achievement of emission control and repairability.
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
Facilitates efficient repair of malfunctioning pixels and enhances electric properties by providing clear markers for repair and shielding external light, thus maintaining the brightness and contrast ratio of OLED panels.
Implementation Method 1
at least one low reflective layer comprises a metallic oxide or a material that absorbs light introduced from outside the substrate
Data Source
AI summary
An organic light emitting display panel is provided that comprises a substrate comprising an emission area and a non-emission area; a black matrix disposed on the non-emission area and comprising at least one open area that exposes at least a portion of a pattern formed on the substrate, wherein the pattern or the exposed portion of the pattern comprises a multi-layer structure comprising a conductive layer and at least one low reflective layer.