Display Bank Layer with Staged Heights for Color Reproduction
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving improved display quality, particularly in color reproduction and viewing angle, due to limitations in the design of color conversion devices and color filters.
Innovation Solution
The display apparatus incorporates a color filter substrate with a bank layer featuring distinct bank portions of varying heights and a color conversion layer, including quantum dots, to enhance color conversion efficiency and viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional bank layer with uniform height is used, then the manufacturing process is simple, but the display quality and color reproduction are limited
Solution Approach 1:
The bank layer is divided into multiple bank portions (first bank portion, second bank portion, third bank portion) with different heights. Each bank portion corresponds to different color filter regions and has optimized height for its specific function, allowing differential control over light extraction and color reproduction in different areas of the display.
Solution Approach 2:
Different regions of the bank layer are assigned different heights and properties: the first bank portion has greater height for enhanced light extraction in certain color regions, while the second and third bank portions have lesser heights optimized for their respective color filter regions. This local optimization improves overall display quality without requiring complete redesign of the entire bank layer.
2Manufacturing precision
If color filters are placed directly on the substrate, then the structure is simple, but the viewing angle and color conversion efficiency are reduced
Solution Approach 1:
The color filter substrate is positioned at a distance from the display substrate, creating a spatial separation in the vertical dimension. This allows light to travel through a longer path and interact more effectively with the color conversion layer, improving color reproduction and viewing angle without requiring direct contact between components.
Solution Approach 2:
A color conversion layer is introduced as an intermediary between the light-emitting element and the color filter. This layer contains quantum dots or other color conversion materials that convert the emitted light to the desired color spectrum, improving color accuracy and viewing angle while allowing the color filter to function more effectively.
3Manufacturing precision
If the color conversion layer is thin, then the manufacturing process is simpler, but the color conversion efficiency is reduced
Solution Approach 1:
The heights of different bank portions are optimized to control the thickness of the color conversion layer in different regions. The first bank portion with greater height allows for a thicker color conversion layer in its region, improving conversion efficiency where needed, while the second and third bank portions maintain lesser heights for regions where thinner layers are sufficient.
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 improves color reproduction and viewing angle by optimizing the placement and thickness of color filters and conversion layers, resulting in enhanced display quality.
Implementation Method 1
The color conversion device may receive blue light from a light source and emit blue, green, and red light, so that images with various colors may be viewed. In this case, the green and red light may be generated by converting the received blue light
Implementation Method 2
a color filter layer disposed on the second substrate and including a first color filter, a second color filter, and a third color filter
Data Source
AI summary
A display apparatus includes: a display substrate including a first substrate and a light-emitting element disposed on the first substrate; and a color filter substrate arranged to face the display substrate, wherein the color filter substrate includes: a second substrate; a color filter layer disposed on the second substrate and including a first color filter, a second color filter, and a third color filter; a bank layer disposed on the color filter layer and including a first bank portion that defines a first opening corresponding to the light-emitting element and a second bank portion that defines a second opening around the first opening.