Color-Conversion Display Pixel Layout With Fewer Alignment Steps
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Solution Overview
Problem
The existing display device manufacturing process is costly and has low yield due to the repeated processes required for aligning light-emitting elements and forming color conversion layers, especially when using different color light-emitting elements and color conversion particles, which increases the complexity and inefficiency.
Innovation Solution
A display device design that incorporates a light-emitting unit with two kinds of light-emitting elements, such as red and blue, and a color conversion layer using the same type of color conversion particles, reducing the number of processes needed for alignment and layer formation, thereby simplifying the manufacturing process and improving yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If different color light-emitting elements and color conversion particles are used, then color display performance is improved, but the number of processes and manufacturing complexity increase
Solution Approach 1:
The patent uses the same type of color conversion particles (yellow phosphors) for multiple purposes: converting blue light to green light in blue-emitting pixels, and converting blue and green light to yellow light in green-emitting pixels. This universal approach allows a single color conversion layer formation process to serve multiple color conversion functions, reducing the number of processes while maintaining color display performance.
Solution Approach 2:
The patent employs homogeneous color conversion particles (yellow phosphors with specific emission wavelengths) throughout different pixel types. By using the same material composition and properties across different pixels, the manufacturing process is simplified while achieving the desired color conversion effects in both blue and green emitting pixels.
2Ease of manufacture
If the same type of color conversion particles are used, then manufacturing process is simplified, but color conversion flexibility may be limited
Solution Approach 1:
The patent applies local quality by positioning the same yellow phosphor particles in different locations and configurations according to specific pixel requirements. In blue pixels, yellow phosphors are positioned to convert blue to green; in green pixels, they are positioned to convert blue and green to yellow. The uniform particle properties simplify manufacturing, while local positioning arrangements provide the necessary color conversion flexibility.
3Manufacturing precision
If multiple alignment processes are performed, then positioning precision is improved, but manufacturing cost and time increase
Solution Approach 1:
The patent merges multiple color conversion layer formation processes into a single process by using the same yellow phosphor particles for different color conversion functions. This consolidation maintains positioning precision through a unified alignment procedure while significantly improving manufacturing efficiency by eliminating repeated alignment operations.
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 approach reduces the number of processes, lowers manufacturing costs, and enhances the luminous efficiency by using the same type of color conversion particles to convert blue light into green light, improving the overall performance of the display device.
Implementation Method 1
a color conversion layer that converts the light of the third color into light of a second color
Data Source
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AI summary
A display device is provided. The display device comprising a first pixel and a second pixel, the display device comprises a light-emitting layer, color conversion layers disposed on the light-emitting layer and color filter layers disposed on the color conversion layers, wherein the light-emitting layer comprises a first light-emitting element disposed in the first pixel, and a second light-emitting element disposed in the second pixel, wherein the color conversion layers comprise a first color conversion layer disposed in the first pixel and a second color conversion layer disposed in the second pixel, the color filter layers comprise a first color filter layer disposed in the first pixel and a second color filter layer disposed in the second pixel, the first light-emitting element and the second light-emitting element emit first light, a central wavelength range of the first light being a first wavelength, the first color conversion layer and the second color conversion layer contain color conversion particles that convert the first light into second light, a central wavelength range of the second light is a second wavelength longer than the first wavelength, the first color filter layer transmits the first light and blocks transmission of the second light, and the second color filter layer transmits the second light and blocks transmission of the first light.