Light Exit Pattern Layout for High-Resolution Color-Pure Displays
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Solution Overview
Problem
Current display devices face challenges in achieving ultra-high resolution and preventing color mixing of light emitted from adjacent areas, particularly in head-mounted displays used for virtual or augmented reality applications.
Innovation Solution
The display device incorporates inorganic light emitting elements, a hole mask layer with specific light exit patterns on a second substrate, and color control structures to manage light emission, ensuring each light exit pattern has a higher refractive index than the substrate and includes wavelength conversion particles and colorants to block or convert light, preventing color mixing and enhancing light exit efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of light emitting elements per unit area is increased to achieve ultra-high resolution, then display resolution is improved, but color mixing between adjacent emission areas occurs
Solution Approach 1:
A light exit structure is introduced as an intermediary component between adjacent light emitting elements. This structure includes a light exit pattern with a protruding second part that has a higher refractive index than the surrounding substrate, creating an optical barrier that guides light exit while preventing lateral spread and color mixing between adjacent emission areas.
Solution Approach 2:
The light exit structure implements local quality by creating localized refractive index variations at specific positions where light needs to exit. The second part of the light exit pattern has a higher refractive index than the substrate, creating localized optical control zones that manage light propagation direction and prevent color mixing without affecting the entire display area.
2Use of energy by moving object
If light exit efficiency is improved by modifying the substrate structure, then light extraction is enhanced, but color mixing between adjacent areas may increase
Solution Approach 1:
The light exit structure implements local quality by creating localized refractive index variations at specific positions where light needs to exit. The second part of the light exit pattern has a higher refractive index than the substrate, creating localized optical control zones that manage light propagation direction and prevent color mixing without affecting the entire display area.
Solution Approach 2:
The light exit pattern acts as an intermediary optical element that mediates between the light emitting element and the external environment. It enhances light extraction efficiency through refractive index matching while simultaneously acting as a barrier to prevent lateral light spread and color mixing.
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 configuration allows for a high-resolution display with reduced color mixing and improved light exit efficiency, suitable for applications like head-mounted displays, by effectively guiding light emission and controlling color output.
Implementation Method 1
wherein a refractive index of each of the light exit patterns is greater than a refractive index of the second substrate
Implementation Method 2
The first part of each of the plurality of light exit patterns may include wavelength conversion particles to convert a wavelength of the light of a first color emitted from the light emitting elements
Implementation Method 3
at least some of the light exit patterns may include a colorant to block transmission of the light of the first color
Data Source
AI summary
A display device includes a first substrate including a display area, a non-display area, and a plurality of pixel circuit units in the display area and the non-display area, a plurality of light emitting elements on the first substrate in the display area, the plurality of light emitting elements being electrically connected to the pixel circuit units, a hole mask layer on the first substrate and including a plurality of holes corresponding to the light emitting elements, a second substrate on the hole mask layer and including a plurality of open holes corresponding to the plurality of holes, and a plurality of light exit patterns in the plurality of the open holes of the second substrate corresponding to the plurality of holes, wherein each of the light exit patterns includes a first part in one of the plurality of open holes.