Display Color Filter Overlap for Uniform Panel Edge Height
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Solution Overview
Problem
Display devices face challenges in minimizing the height difference between the display area and the non-display area, leading to potential optical film voids and appearance defects.
Innovation Solution
The display device incorporates a design with a substrate having a display area and a non-display area, featuring sub-pixels with light emitting elements, color control members, and color filter layers, where the first and third color filter layers extend into the non-display area, overlapping each other, and a dam member with a valley structure to prevent organic material overflow and maintain a uniform surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display area and non-display area are formed with different structures, then the display function is achieved, but a height difference occurs between the two areas
Solution Approach 1:
The color filter layers from the display area are extended into the non-display area to merge the structures of both regions. This integration allows the non-display area to adopt the same height profile as the display area, eliminating the height difference while preserving display functionality.
Solution Approach 2:
The color filter layers are extended in the planar dimension from the display area into the non-display area. This dimensional extension creates a continuous surface structure that resolves the height difference issue by bringing both areas to the same elevation level.
2Shape
If the height difference between display area and non-display area is large, then the structural distinction is clear, but voids occur under optical films
Solution Approach 1:
By extending the color filter layers into the non-display area, the invention merges the height profiles of both regions. This creates a uniform surface that prevents void formation under optical films during the manufacturing process, while still maintaining clear structural distinction through the valley formation.
3Shape
If the surface is not uniform, then the structural features are distinct, but appearance defects occur
Solution Approach 1:
The extension of color filter layers into the non-display area merges the surface heights, creating a uniform appearance that eliminates visual defects. The valley structure maintains structural distinction while the overall surface uniformity prevents appearance defects.
4Shape
If color filter layers are extended to the non-display area, then height difference is reduced, but the complexity of layer arrangement increases
Solution Approach 1:
The invention merges the color filter layer structure from the display area into the non-display area, achieving height uniformity. While this extends the layer arrangement, it follows the existing color filter pattern, thereby managing complexity through systematic extension rather than introducing entirely new structural elements.
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 design reduces the height difference between the display and non-display areas, preventing voids under optical films and enhancing the appearance by ensuring a uniform surface for the optical film attachment.
Implementation Method 1
The first color filter layer and the third color filter layer may overlap each other in a thickness direction at a boundary area between the first sub-pixel and the non-display area
Implementation Method 2
a dam member spaced apart from the upper bank layer, the dam member surrounding the display area in the non-display area; and a valley disposed between the dam member and the upper bank layer
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area surrounding the display area, a plurality of sub-pixels including a first sub-pixel and a second sub-pixel, an upper bank layer surrounding the sub-pixels and the display area, a plurality of color control members including a first wavelength conversion layer in the first sub-pixel and a second wavelength conversion layer in the second sub-pixel, a plurality of color filter layers including a first color filter layer on the first wavelength conversion layer, and a second color filter layer on the second wavelength conversion layer, and a third color filter layer, a dam member surrounding the display area in the non-display area, and a valley between the dam member and the upper bank layer and surrounding the display area. The third color filter layer is on the first color filter layer in the non-display area.