Color Filter Compensation Structure for Display Edge Step Differences
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Solution Overview
Problem
Current display devices face challenges in achieving improved reliability and efficiency in their manufacturing processes, particularly in the integration of light emitting elements and color conversion layers, which affect the overall performance and durability of the display.
Innovation Solution
The proposed solution involves a display device design that includes a substrate with a display area and a non-display area, featuring a light emitting element, a color conversion layer, and step difference compensation patterns made of the same material as the color filter layer, along with specific structural elements like bank patterns and insulating layers to enhance the alignment and efficiency of light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If step difference compensation patterns are added to compensate for substrate thickness variations, then display uniformity and reliability are improved, but device structure and fabrication complexity increase
Solution Approach 1:
The compensation pattern is divided into multiple segments (first compensation pattern and second compensation pattern) positioned at different locations. Each segment addresses specific regional thickness variations independently, allowing targeted compensation without requiring a complete redesign of the entire substrate structure.
Solution Approach 2:
Different compensation patterns are applied to different regions of the substrate based on local thickness characteristics. The first compensation pattern addresses areas with one type of thickness variation, while the second compensation pattern addresses areas with different thickness characteristics, optimizing compensation effectiveness locally rather than using a uniform approach.
2Reliability
If multiple compensation patterns with different materials are used, then compensation effectiveness is improved, but manufacturing processes and material selection complexity increase
Solution Approach 1:
The compensation patterns are designed to serve multiple functions: they compensate for thickness variations, provide structural support, and in some cases contribute to the display function (e.g., color filtering). This multi-functionality reduces the need for separate dedicated compensation structures, simplifying the overall manufacturing process.
Solution Approach 2:
The compensation patterns utilize composite material structures combining different materials (e.g., inorganic layers and organic layers) to achieve both mechanical compensation and functional requirements. This allows a single integrated structure to fulfill multiple roles, reducing the number of separate manufacturing steps.
Data Source
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AI summary
A display device including: a substrate including a display area including a pixel area, and a non-display area at at least one side of the display area; a pixel in the pixel area, and including a light emitting element, a color conversion layer located on the light emitting element, and a color filter layer located on the color conversion layer; a first step difference compensation pattern in the non-display area, and around the display area; and a second step difference compensation pattern in the non-display area, and including a first end adjacent to the display area, and a second end opposite to the first end and located adjacent to an edge of the substrate, wherein the second step difference compensation pattern is located on the first step difference compensation pattern and overlaps the first step difference compensation pattern, and covers one end of the first step difference compensation pattern.