Color-Converting Display Fabrication Without Extra Exposure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices that use a light source passing through a color filter suffer from energy loss, wide full width at half maximum of output light, and deteriorated luminance and color purity, making it difficult to manufacture large display devices with high optical efficiency and color reproducibility.
Innovation Solution
A display device comprising multiple light-emitting elements, a first and second color converting layer, and a transmission layer, where the color converting layers are formed using a simplified process without additional exposure apparatus, and the transmission layer allows for excellent adherence and reduced manufacturing time and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a color filter is used to generate colors by filtering light from a light source, then the display device can be manufactured relatively easily and large display devices can be realized, but energy loss occurs, full width of half maximum becomes wide, and luminance and color purity deteriorate
Solution Approach 1:
The patent changes the fundamental parameter of color generation from subtractive filtering to additive conversion. By using quantum dot layers that convert blue light to red and green wavelengths through photoluminescence, the system achieves high color purity and luminance efficiency while maintaining manufacturing feasibility through solution processing techniques.
Solution Approach 2:
The patent replaces the optical filtering mechanism with a photoluminescent conversion mechanism. Instead of using absorbing color filters that waste energy, the invention uses quantum dots that convert light wavelengths efficiently, substituting a lossy optical system with a more efficient photonic conversion system.
2Area of stationary object
If a color filter is used to generate colors, then large display devices can be manufactured, but color purity deteriorates
Solution Approach 1:
The patent changes the color generation mechanism to use quantum dot photoluminescence, which inherently provides narrow emission spectra and high color purity. The quantum dot size parameter controls the emission wavelength precisely, enabling high color purity across large display areas without the trade-off inherent in filter-based approaches.
3Manufacturing precision
If a light-emitting type display device is manufactured with different materials and characteristics for respective pixels, then high color purity can be achieved, but the manufacturing process becomes complex and manufacturing large display devices becomes difficult
Solution Approach 1:
The patent uses a universal blue light emitting layer combined with quantum dot conversion layers that can generate different colors (red, green, blue) through material composition control rather than requiring completely different light-emitting structures for each pixel. This multi-functional approach maintains high color purity while simplifying the manufacturing process.
Solution Approach 2:
The patent controls color output by changing the quantum dot material parameters (composition, size, shell structure) rather than changing the entire light-emitting device structure for each pixel. This parameter-based control enables high color purity with a standardized manufacturing process.
4Ease of manufacture
If traditional color filter methods are used, then manufacturing is easier, but luminance deteriorates
Solution Approach 1:
The patent replaces the absorbing color filter system with a photoluminescent quantum dot conversion system. This substitution eliminates the inherent energy loss of filtering and converts blue light from the emitting layer into red and green wavelengths with high efficiency, thereby maintaining ease of manufacture while dramatically improving luminance.
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
The solution achieves high optical efficiency, color purity, and reproducibility while simplifying the manufacturing process, enabling the production of large display devices with improved luminance and color accuracy.
Implementation Method 1
a plurality of light emitting element which emits incident light
Implementation Method 2
a first color converting layer which color-converts the incident light
Implementation Method 3
a second color converting layer which color-converts the incident light
Implementation Method 4
a transmission layer which transmits the incident light
Data Source
AI summary
A method for manufacturing a display device includes: providing a plurality of light emitting elements on a substrate; providing a first photosensitive resin layer on the light emitting elements; driving a plurality of first light emitting elements among the plurality of light emitting elements, the driving of the plurality of first light emitting elements hardening a portion of the first photosensitive resin layer which corresponds to the plurality of first light emitting elements; and providing a first color converting layer as the portion of the first photosensitive resin layer which is hardened, by removing a remaining portion of the first photosensitive resin layer.