Quantum Dot Filler and Color Filter Layout for High-Resolution Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving high-resolution display with efficient color reproduction, particularly due to the difficulty in depositing color conversion layers using inkjet processes as the resolution increases.
Innovation Solution
A display device design that incorporates a color filter unit with specific color filters and spacers, along with a filler containing wavelength conversion particles, allows for the expression of green and blue light through color filters and red light through quantum dots, eliminating the need for inkjet deposition of color conversion layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the opening size is decreased to achieve high resolution, then the manufacturing precision is improved, but the ease of manufacture deteriorates due to difficulties in depositing color conversion layers
Solution Approach 1:
The patent extracts the color conversion function from the traditional inkjet-deposited color conversion layer and relocates it to quantum dots embedded in the filler material. This separation allows the color conversion function to be achieved through material selection rather than precise deposition processes, thereby resolving the contradiction between high resolution and ease of manufacture.
Solution Approach 2:
The patent changes the physical and chemical parameters of the filler material by incorporating quantum dots with specific size and composition parameters. This parameter change enables the filler to perform wavelength conversion functions that were previously requiring complex deposition processes, thus improving ease of manufacture while maintaining high resolution.
2Device complexity
If the inkjet process is used to deposit color conversion layers, then the device complexity is reduced, but the manufacturing precision deteriorates due to challenges in high-resolution deposition
Solution Approach 1:
The patent extracts the color conversion function from the inkjet deposition process and transfers it to the quantum dot-containing filler material. This extraction eliminates the need for complex inkjet deposition equipment and processes, simplifying the overall device structure while achieving high resolution through material properties rather than process complexity.
Solution Approach 2:
The patent replaces the mechanical inkjet deposition system with a material-based solution where quantum dots in the filler perform wavelength conversion. This substitution eliminates the need for precise mechanical deposition while achieving the same functional result with simpler equipment and processes.
3Ease of manufacture
If wavelength conversion particles are added to the filler, then the ease of manufacture is improved by eliminating inkjet process, but the device complexity increases due to additional components
Solution Approach 1:
The patent merges the wavelength conversion function with the existing filler material by incorporating quantum dots into it. This merging eliminates the need for separate color conversion layers and their associated deposition processes, thereby improving ease of manufacture without significantly increasing device complexity. The quantum dot-containing filler serves multiple functions simultaneously.
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 enhances display reliability and resolution by enabling effective color expression without the limitations of inkjet processes, ensuring high-quality color reproduction.
Implementation Method 1
a filler disposed between the display unit and the color filter unit and including a wavelength conversion particle. In an embodiment, the wavelength conversion particle may include quantum dots emitting first color light. In an embodiment, the first color light may be red light.
Implementation Method 2
The color filter unit may include a color filter layer including a first color filter, a second color filter, and a third color filter disposed on the lower surface of the upper substrate
Implementation Method 3
the first color filter and the second color filter may include a scattering element
Data Source
AI summary
A display device includes a display unit including a lower substrate and first, second, and third light emitting elements disposed on the lower substrate, a color filter unit including an upper substrate having a lower surface facing the first, second, and third light emitting elements, a filler disposed between the display unit and the color filter unit and including a wavelength conversion particle. The color filter unit further includes a color filter layer including first, second, and third color filters disposed on the lower surface of the upper substrate, a bank layer disposed below the color filter layer and including first, second, and third openings, a first column spacer filling the first opening, and a second column spacer filling the second opening.