AMOLED Light-Obstructing Layer Pixel Definition
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Solution Overview
Problem
Conventional AMOLED display panels face issues with non-uniform display and mixed colors due to the complexity and high number of processes, particularly the need for a pixel definition layer, which affects display quality and increases manufacturing costs.
Innovation Solution
Incorporating a light-obstructing layer between the substrate and the active layer, with a light-permeable region that defines pixels, reduces the need for a pixel definition layer, blocks non-uniform display edges, and ensures uniform light output, thereby enhancing display quality and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pixel definition layer is used to define pixels in conventional AMOLED displays, then the display structure can be established, but the number of processes increases and the processes become complicated
Solution Approach 1:
The patent extracts and removes the pixel definition layer from the conventional AMOLED structure. By using the light-obstructing layer's opening pattern to directly define pixel regions, the pixel definition layer process is eliminated, reducing the total number of manufacturing process steps and simplifying the overall fabrication process.
Solution Approach 2:
The patent merges the function of pixel definition with the light-obstructing layer structure. The light-obstructing layer serves dual purposes: blocking light in non-display regions and defining pixel boundaries through its opening pattern, thereby combining multiple functions into a single layer and reducing overall device complexity.
2Device complexity
If the pixel definition layer is omitted to simplify manufacturing, then the number of processes is reduced, but the display produces non-uniform edges and mixed colors
Solution Approach 1:
The patent introduces an intermediary structure - the light-obstructing layer with a specifically designed opening pattern - that mediates between the simplified manufacturing approach and the requirement for display uniformity. This opening pattern acts as a mediator that shapes light output to prevent non-uniform edges and mixed colors while maintaining the reduced process count.
Solution Approach 2:
The patent applies local quality by designing the light-obstructing layer's opening pattern with varying characteristics in different regions. The opening pattern is specifically configured to control light emission locally at pixel boundaries and corners, ensuring uniform display quality in critical regions while maintaining overall manufacturing simplicity.
3Manufacturing precision
If conventional processes are used with pixel definition layer, then complete pixel definition is achieved, but manufacturing cost increases due to high number of processes
Solution Approach 1:
The patent extracts and eliminates the pixel definition layer process, achieving pixel definition through the light-obstructing layer's opening pattern instead. This reduction in process steps directly lowers manufacturing costs while maintaining pixel definition accuracy through the carefully designed opening configuration.
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 improves display uniformity, prevents mixed colors, extends the panel's lifetime, and reduces manufacturing costs by simplifying the process, leading to better display performance and increased competitiveness.
Implementation Method 1
The light-obstructing layer blocks the non-uniform display edge portion of the active layer, and only the light rays that provide the uniform display and are consistent with the design are outputted
Implementation Method 2
The light-emitting device is a white organic light-emitting diode
Implementation Method 3
the light rays emitted by the white organic light-emitting diode pass through the color resist layer very well
Data Source
AI summary
A display panel includes a substrate, active switches, and an active layer. The active switches are disposed on the substrate, and the active layer is disposed on the active switches. A light-obstructing layer is disposed between the substrate and the active layer. The light-obstructing layer is provided with a light-permeable region, and orthogonal projection areas of the light-permeable region and the active layer on the substrate correspond to each other. The light-permeable region defines pixels of the display panel.