Multi-Layer Black Matrix for Display Reflection Control
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Solution Overview
Problem
Display devices face issues with image reflection on unwanted areas, degraded image quality, reduced brightness, and increased thickness, particularly in applications like automotive electronic modules where images are visible through front glass windows.
Innovation Solution
The implementation of an emitted light control layer with multiple black matrix layers and cover layers positioned on a passivation layer to define non-emissive areas between sub-pixels, controlling light emission and viewing angles without hindering front brightness or increasing device thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single black matrix layer is used to define non-emissive areas, then the structure is simple, but image reflection occurs on unwanted areas and image quality degrades
Solution Approach 1:
The black matrix layer is divided into multiple separate layers (first black matrix layer, second black matrix layer, etc.) instead of using a single layer. Each layer is positioned at different heights above the substrate and can be independently optimized to control light reflection paths, thereby reducing image reflection on unwanted areas while maintaining manufacturing feasibility
2Object-affected harmful factors
If the black matrix layer is positioned closer to the sub-pixels, then image quality improves, but brightness is reduced
Solution Approach 1:
The solution moves from a two-dimensional planar arrangement to a three-dimensional stacked arrangement of black matrix layers at different heights. By positioning layers at multiple vertical levels (different z-heights above the substrate), the patent achieves better angular control of reflected light without requiring the layers to be immediately adjacent to the sub-pixels, thus maintaining brightness while improving image quality
3Object-affected harmful factors
If multiple black matrix layers are added to control light reflection, then image quality improves, but device thickness increases
Solution Approach 1:
The patent employs thin film structures for the multiple black matrix layers, where each layer is a thin coating deposited on successive cover layers. This approach allows multiple functional layers to be stacked within a constrained thickness budget, achieving effective light reflection control without proportionally increasing the overall device thickness
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 solution effectively reduces image reflection on unwanted areas, enhances image quality, maintains brightness, and optimizes the viewing angle of display panels without increasing thickness, addressing the specific challenges faced in automotive and other applications.
Implementation Method 1
an emitted light control layer on the passivation layer to define a non-emissive area between the sub-pixels, wherein the emitted light control layer includes black matrix layers divided into at least two layers
Implementation Method 2
a first cover layer positioned on the first black matrix layer, a second cover layer positioned on the second black matrix layer
Data Source
AI summary
A display device includes a substrate, sub-pixels on the substrate, a passivation layer on the sub-pixels, and an emitted light control layer on the passivation layer to define a non-emissive area between the sub-pixels, wherein the emitted light control layer includes black matrix layers divided into at least two layers.