Organic Electroluminescence Device with Spaced Black Matrices
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Solution Overview
Problem
Organic electroluminescence devices face color mixture issues due to the presence of black matrices, which reduce opening permeability and affect luminance.
Innovation Solution
The device incorporates Pixel Defining Layers, first and second electrodes, white light emitting layers, and a color filter layer with minimized black matrices positioned to prevent light emission to adjacent color filters, while second black matrices further shield light to adjacent filters, maintaining high opening permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If black matrices are installed on color filter interface to prevent color mixture, then color mixture is prevented, but opening permeability is reduced
Solution Approach 1:
The patent introduces a vertical spacing dimension between the color filter layer and black matrices, transitioning from a conventional planar contact structure to a spaced three-dimensional structure. This dimensional change allows light to pass through the opening regions more effectively while black matrices continue to block light in the pixel defining regions, thus resolving the contradiction between color mixture prevention and opening permeability.
Solution Approach 2:
The patent segments the black matrices into two functional zones: first black matrices positioned in pixel defining regions and second black matrices positioned at color filter interfaces. This segmentation allows each zone to perform its specific function independently - pixel definition and color filtering - without interfering with each other, thereby maintaining high opening permeability while preventing color mixture.
2Reliability
If black matrices are installed on color filter interface to prevent color mixture, then color mixture is prevented, but luminance is affected
Solution Approach 1:
By introducing vertical spacing between the color filter layer and black matrices, the patent creates an optical path that minimizes light obstruction. The spaced configuration reduces the shadow effect and light absorption by black matrices, thereby maintaining high luminance output while still preventing color mixture through the vertical light blocking function of the black matrices.
Solution Approach 2:
The patent applies black matrices with different properties in different locations: first black matrices with specific optical characteristics in pixel defining regions and second black matrices at color filter interfaces. This local differentiation ensures that luminance is maintained in opening regions while color mixture is prevented at interfaces, resolving the contradiction between these two requirements.
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 mixture while maximizing opening permeability, enhancing the luminance and color accuracy of the organic electroluminescence device.
Implementation Method 1
white light emitting layers formed in a space that is defined by the first electrodes and the PDLs
Data Source
AI summary
An organic electroluminescence device comprises a plurality of Pixel Defining Layers (PDLs) formed on a substrate, first electrodes formed in a space that is defined by the substrate and the PDLs, white light emitting layers formed in a space that is defined by the first electrodes and the PDLs, a second electrode formed on the white light emitting layers, first black matrices formed on the second electrode, and a color filter layer located adjacent to the first black matrices and spaced apart from the first black matrices.