Dual Light-Shielding Layers for OLED Color Mixing
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Solution Overview
Problem
Display devices with organic electroluminescent elements face image quality degradation due to color mixing, even when a black matrix layer is used, especially at high definition pixel pitches.
Innovation Solution
A display device configuration with a light-reflective first electrode, an organic layer including a light-emission layer, and a light-transparent second electrode, featuring a first light-shielding layer between pixels on one side of the second substrate and a second light-shielding layer facing part of the first light-shielding layer, which shields obliquely emitted light from entering adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix layer is provided between pixels to prevent light mixing, then light shielding is improved, but color mixing still occurs and image quality degrades
Solution Approach 1:
The single black matrix layer is segmented into two separate light-shielding layers: a first light-shielding layer positioned on the organic layer side and a second light-shielding layer positioned on the electrode side. This segmentation allows each layer to specifically block light from different directions, effectively preventing color mixing while maintaining pixel isolation.
Solution Approach 2:
The solution moves from a single-plane light-shielding approach to a two-dimensional layered structure. By positioning light-shielding layers at different depths (one on the organic layer side, one on the electrode side), the patent creates a three-dimensional light-blocking configuration that comprehensively addresses oblique light leakage from multiple angles.
2Measurement precision
If pixel pitch is narrowed to achieve high definition, then resolution is improved, but light from adjacent pixels mixes and image quality degrades
Solution Approach 1:
The dual light-shielding layer structure segments the light-blocking function into two distinct layers positioned at different depths. The first layer blocks light from the organic layer interface, while the second layer blocks light from the electrode interface, providing comprehensive shielding even when pixels are closely spaced for high definition displays.
Solution Approach 2:
Each light-shielding layer is positioned at a specific location optimized for its function: the first layer is locally positioned on the organic layer side to block light at the emission interface, while the second layer is locally positioned on the electrode side to block light at the reflection interface. This localized positioning ensures effective light blocking in narrow pixel pitch configurations.
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
This configuration effectively prevents color mixing and maintains high image quality even at narrow pixel pitches by shielding light from adjacent pixels, thereby restraining degradation in image quality accompanying high definition.
Implementation Method 1
The first light-shielding layer is provided in a region between the plurality of pixels on one side of the second substrate; and a second light-shielding layer that is provided between the first light-shielding layer and the first substrate, the second light-shielding layer facing at least part of the first light-shielding layer
Implementation Method 2
the plurality of pixels each including a light-reflective first electrode, an organic layer, and a light-transparent second electrode
Data Source
AI summary
Provided is a display device, including: a plurality of pixels that are provided between a first substrate and a light-transparent second substrate, the plurality of pixels each including a light-reflective first electrode, an organic layer, and a light-transparent second electrode in order from the first substrate side, the organic layer including at least a light-emission layer; a first light-shielding layer that is provided in a region between the plurality of pixels on one side of the second substrate; and a second light-shielding layer that is provided between the first light-shielding layer and the first substrate, the second light-shielding layer facing at least part of the first light-shielding layer.