Black Adhesive Layer for Flexible Display Color Separation
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Solution Overview
Problem
Flexible display panels face issues with aperture diffraction leading to color separation, which affects display quality, especially in the absence of polarizers.
Innovation Solution
Incorporating a black adhesive layer with optically clear adhesive and opaque particles throughout the display region, including subpixel and inter-subpixel areas, to extend throughout the display panel, achieving light transmittance in the range of 40% to 80%, which effectively eliminates color separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a black matrix layer is used to define subpixel regions, then subpixel definition is improved, but aperture diffraction causes color separation
Solution Approach 1:
The patent introduces an intermediary layer (the adhesive layer with black particles) between the black matrix layer and the cover glass. This intermediary layer acts as a mediator that receives light diffracted by the black matrix and redirects it unidirectionally, preventing the harmful color separation effect while preserving the subpixel definition function of the black matrix layer.
Solution Approach 2:
The patent converts the harmful aperture diffraction effect into a beneficial unidirectional light reflection. By using the adhesive layer with black particles, the diffracted light that would normally cause color separation is instead redirected to create a focused, unidirectional reflection pattern that eliminates color separation while maintaining subpixel definition.
2Object-generated harmful factors
If polarizers are added to eliminate color separation, then color separation is reduced, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for polarizers from the display structure. Instead of using polarizers to control light polarization and prevent color separation, the invention uses a black adhesive layer with particles that redirects diffracted light unidirectionally, achieving the same effect without requiring polarizing elements and thus reducing device complexity.
Solution Approach 2:
The adhesive layer with black particles serves as an intermediary that replaces the function of polarizers. It intercepts the diffracted light from the black matrix and redirects it in a controlled unidirectional manner, achieving color separation elimination without the need for polarizing components.
3Illumination intensity
If light transmittance is increased to improve brightness, then brightness is improved, but color separation worsens
Solution Approach 1:
The patent optimizes the light transmittance parameter of the adhesive layer to a specific range (40%-80%). This parameter change allows the adhesive layer to transmit sufficient light for adequate brightness while simultaneously blocking the diffracted light that causes color separation, achieving a balance between brightness and color separation elimination.
Solution Approach 2:
The adhesive layer is applied specifically in the inter-subpixel regions where color separation occurs, while maintaining high light transmittance in the subpixel regions. This localized application with differentiated optical properties allows the system to achieve both brightness and color separation elimination simultaneously.
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
Significantly reduces color separation and achieves a more focused, unidirectional light reflection with a narrow color spectrum and low haze, enhancing display quality without the need for polarizers.
Implementation Method 1
the black adhesive layer comprises an optically clear adhesive and particles distributed throughout the optically clear adhesive; and light transmittance of the black adhesive layer is in a range of 40% to 80%
Implementation Method 2
particles distributed throughout the optically clear adhesive
Data Source
AI summary
A display panel having a plurality of subpixels is provided. The display panel includes a black matrix layer; a black adhesive layer on the black matrix layer; and a cover an a side of the black adhesive layer away from the black matrix layer. The black adhesive layer extends substantially throughout an entirety of a display region of the display panel, including a subpixel region and an inter-subpixel region. The black adhesive layer includes an optically clear adhesive and particles distributed throughout the optically clear adhesive. Light transmittance of the black adhesive layer is in a range of 40% to 80%.