Display Panel Black Array Layer for Ambient Light Reflection
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Solution Overview
Problem
OLED displays face issues with light reflection and absorption due to their multi-layered metal structure, leading to reduced light output and contrast ratio, which existing anti-reflection layers like circular polarizers cannot effectively address.
Innovation Solution
A display panel design incorporating a black array layer in non-light emitting regions, formed within or between inorganic and organic layers of the package structure, shields metal layers from ambient light, improving light output and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is used to absorb ambient light reflected by the metal, then the reflection is reduced, but the light extraction efficiency decreases and contrast ratio decreases
Solution Approach 1:
The patent divides the display area into light-emitting regions and non-light-emitting regions, and applies the black matrix layer specifically in the non-light-emitting regions. This segmentation allows the polarizer to be removed or simplified, improving light extraction efficiency in the light-emitting areas while maintaining reflection suppression in the non-light-emitting areas.
Solution Approach 2:
The black matrix layer is selectively applied only in the non-light-emitting regions where reflection control is needed, rather than using a circular polarizer across the entire display. This local application maintains high light extraction efficiency in light-emitting regions while effectively controlling reflections in non-light-emitting regions.
2Object-affected harmful factors
If a circular polarizer is used to absorb ambient light reflected by the metal, then the reflection is reduced, but the contrast ratio decreases
Solution Approach 1:
By segmenting the display into light-emitting and non-light-emitting regions and applying the black matrix only in non-light-emitting regions, the patent prevents ambient light reflection in dark areas without affecting the light output in emitting areas, thereby maintaining high contrast ratio.
Solution Approach 2:
The localized application of the black matrix layer in non-light-emitting regions provides targeted reflection control where needed, preserving the contrast between light and dark areas without the light-blocking effects of a full circular polarizer.
3Illumination intensity
If the black array layer is formed in the non-light emitting regions, then the light output rate is improved, but the device complexity increases
Solution Approach 1:
The black matrix layer is integrated into the existing package structure by forming it within or between the inorganic and organic layers, merging the reflection control function with the existing protective packaging layers rather than adding a separate complex structure.
Solution Approach 2:
The package structure layers (inorganic and organic layers) serve dual functions: providing protection and encapsulation for the OLED, and simultaneously housing the black matrix layer for reflection control. This multi-functionality reduces overall device complexity.
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
The black array layer effectively shields metal layers from ambient light, enhancing light output and contrast ratio by preventing light reflection and absorption, thereby improving the overall display quality.
Implementation Method 1
the black array is used to shield the metal layer to reflect and absorb the environment light
Data Source
AI summary
A display panel is provided and includes a display region including a plurality of sub pixel regions arranged in an array, wherein each of the sub pixel regions comprises a light emitting region and a non-light emitting region; a black array layer formed in the non-light emitting regions, the black array is used to shield the metal layer to reflect and absorb the environment light, to improve a light output rate and to improve a contrast ratio of the display device.