OLED Anode Segmentation for Light Reflection Control
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Solution Overview
Problem
Existing organic electroluminescent display devices face challenges in achieving higher definition and luminance due to light reflection between adjacent pixels, leading to color mixture and reduced luminance, especially as pixel density increases.
Innovation Solution
The implementation of a configuration that includes a substrate with matrix-arranged anodes, insulating pixel separation films covering the edges of anodes, an organic layer with a light emitting layer, and a cathode, where the anodes have a contact area and a peripheral area that faces the counter substrate, along with an insulating film with trenches between pixels, to prevent light reflection and enhance light emission directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased to achieve higher definition, then image quality is improved, but light reflection between adjacent pixels causes color mixture and luminance reduction
Solution Approach 1:
The anode is divided into two distinct regions: a contact area that contacts the organic layer and a peripheral area surrounded by the pixel separation film. This segmentation allows the peripheral area to act as a light reflection barrier, preventing light from adjacent pixels from entering the contact area, thus eliminating color mixture while maintaining high pixel density
Solution Approach 2:
The pixel separation film serves as an intermediary structure between adjacent anodes. It is positioned to cover at least the edge of anodes and has a height greater than the thickness of the organic layer, creating a physical barrier that blocks light reflection paths between pixels, thereby preventing color mixture
2Measurement precision
If pixel spacing is reduced to increase pixel density, then higher definition is achieved, but light reflection between adjacent pixels increases causing luminance reduction
Solution Approach 1:
By segmenting the anode into contact area and peripheral area, the peripheral area becomes an active light management component. Even when pixels are closely spaced, the peripheral area reflects stray light back to its origin pixel rather than allowing it to enter adjacent pixels, maintaining luminance efficiency at high pixel densities
Solution Approach 2:
The pixel separation film extends in the vertical dimension (height greater than organic layer thickness), creating a three-dimensional barrier structure. This vertical extension effectively blocks light reflection paths without requiring increased horizontal spacing between pixels, enabling high pixel density while preventing luminance loss
3Object-affected harmful factors
If peripheral area is formed around contact area, then light reflection is prevented and color mixture is reduced, but device structure becomes more complex
Solution Approach 1:
The pixel separation film performs multiple functions: it provides electrical insulation between adjacent anodes, structurally defines the peripheral area, and optically blocks light reflection paths. By combining these functions into a single structure, device complexity is minimized while achieving color mixture prevention
Solution Approach 2:
The peripheral area is formed by the pixel separation film covering the anode edge, merging the insulation function and light blocking function into a single integrated structure. This eliminates the need for separate components, simplifying the overall device structure while preventing color mixture
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 reduces light reflection between adjacent pixels, enabling higher definition, higher luminance, and prevention of color mixture, even at closer pixel spacings, thereby improving the overall performance of the organic electroluminescent display device.
Implementation Method 1
an organic electroluminescent display device, includes: a substrate; a plurality of anodes that are formed in respective pixels arranged in a display area of the substrate in a matrix
Implementation Method 2
pixel separation films that are made of an insulating material, and cover at least an edge of the respective anodes between the respective pixels
Data Source
AI summary
An organic electroluminescent display device includes: a substrate; plural anodes that are formed in respective pixels; pixel separation films that cover at least an edge of the respective anodes between the respective pixels; an organic layer that covers a display area over the plurality of anodes, and the pixel separation films, and includes at least a light emitting layer; a cathode that is formed on the organic layer; and a counter substrate that is arranged on the cathode so as to face the substrate, in which the anodes each include: a contact area that comes in contact with the organic layer, and faces a corresponding pixel of the counter substrate, and a peripheral area that is formed around the contact area, and faces pixels around the corresponding pixels of the counter substrate. The organic electroluminescent display device can realize higher definition, higher luminance, and prevention of color mixture.