Quantum Dot Display Color Unit With Light-Shielding Spacers
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving improved display quality, particularly in terms of color accuracy and prevention of color mixing between adjacent pixels.
Innovation Solution
A display apparatus is designed with a light-emitting unit and a color unit that includes a light-transmission layer with openings for color conversion layers, spacer layers made of light shielding material, and color filter layers to enhance color purity and prevent color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional display structure without dedicated light shielding between color areas is used, then the device complexity is reduced, but color mixing occurs between adjacent color areas degrading display quality
Solution Approach 1:
The display structure is segmented by introducing spacer elements between adjacent color areas. These spacers divide the continuous color conversion layer into distinct segments, preventing light from one color area from interfering with adjacent color areas, thus eliminating color mixing while maintaining manufacturing feasibility
Solution Approach 2:
A spacer acting as an intermediary light-shielding element is introduced between adjacent color areas. This intermediary structure blocks stray light from reaching neighboring color conversion layers, preventing color mixing without requiring complete redesign of the entire display stack
2Manufacturing precision
If the spacer length in the first direction is increased to improve color isolation, then color mixing prevention is enhanced, but the area of the color conversion layers is reduced
Solution Approach 1:
The spacer is designed with optimized local dimensions where its length in the first direction is equal to or less than the overlap length of adjacent color areas in the second direction. This local optimization ensures sufficient light blocking at critical interfaces while preserving maximum area for color conversion layers in the overlapping region
Solution Approach 2:
Rather than making spacers extend across the entire display area, the invention applies partial action by limiting spacer length to only where needed for color isolation. This partial approach prevents color mixing at adjacent color area interfaces while leaving the majority of the color conversion layer area intact for light emission
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 effectively improves color reproduction rates and display quality by minimizing color mixing and enhancing light efficiency through the use of scattering particles and quantum dots in the color conversion layers.
Implementation Method 1
Quantum dots may be excited by incident light to emit light having a longer wavelength than the wavelength of the incident light
Implementation Method 2
Each of the light-transmission layer, the first color conversion layer, and the second color conversion layer may include scattering particles
Data Source
AI summary
A display apparatus includes a light-emitting unit including light-emitting elements, and a color unit disposed on the light-emitting unit and including a first color area, a second color area, and a third color area that overlap the light-emitting elements and emit light beams of different colors. The color unit includes a light-transmission layer including a first opening corresponding to the first color area and a second opening corresponding to the second color area, a first color conversion layer disposed within the first opening of the light-transmission layer, a second color conversion layer disposed within the second opening of the light-transmission layer, and a spacer disposed on the light-transmission layer and between two adjacent color areas among the first color area, the second color area, and the third color area, the spacer including a light shielding material.