Micro-LED Pixel Layout for VR Center Color Uniformity
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Solution Overview
Problem
Display devices for virtual reality (VR) require different display characteristics for each region to enhance immersion, but existing technologies lack a specific configuration to achieve varying micro-LED arrangement densities across regions.
Innovation Solution
A display device with a substrate divided into regions, where the first region at the center has a higher number of light-emitting elements and the second region closer to the outer end has fewer light-emitting elements but with different emission wavelength characteristics, ensuring higher arrangement density and reduced emission wavelength variation at the center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of light-emitting elements is increased in the first region (center), then display definition and color uniformity are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by differentiating the configuration of light-emitting elements between the first region (center) and second region (periphery). Specifically, the first region uses light-emitting elements with smaller emission wavelength variations and higher arrangement density, while the second region uses elements with larger wavelength variations and lower density. This localized differentiation optimizes display definition and color uniformity where needed without uniformly increasing device complexity across the entire display.
Solution Approach 2:
The display region is segmented into multiple regions (first region at center, second region at periphery) with different light-emitting element specifications. This segmentation allows independent optimization of each region's characteristics, enabling high display definition in the center while managing overall device complexity through regional differentiation rather than uniform high-density configuration.
2Stability of the object's composition
If light-emitting elements with smaller emission wavelength variations are used in the first region, then color unevenness is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that light-emitting elements in the first region have smaller emission wavelength variations (Δλ1) compared to elements in the second region (Δλ2, where Δλ1 < Δλ2). This local quality approach ensures color uniformity in the visually critical center region while allowing greater manufacturing tolerance in peripheral regions, thereby reducing overall manufacturing precision requirements.
Solution Approach 2:
The patent changes the emission wavelength variation parameter differently across regions: using elements with smaller Δλ in the first region and larger Δλ in the second region. This parameter differentiation achieves color uniformity where needed while relaxing manufacturing precision constraints in less critical areas.
3Adaptability or versatility
If different arrangement densities are used for different regions, then display characteristics are optimized for VR immersion, but device complexity increases
Solution Approach 1:
The patent implements different arrangement densities in different regions: higher density in the first region (center) and lower density in the second region (periphery). This local differentiation optimizes display characteristics for VR immersion by concentrating visual quality where the user's focus is most likely to be, while reducing device complexity through lower peripheral requirements.
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-definition display and reduced color unevenness at the center of the field of view while providing redundancy and flexibility in display characteristics for peripheral regions, enhancing overall VR immersion.
Implementation Method 1
a plurality of light-emitting elements provided to the pixels... each of the pixels in the first region comprises a first light-emitting element and a second light-emitting element configured to output light in the same color... having a peak emission wavelength different from a peak emission wavelength
Data Source
AI summary
A display device includes a substrate, a plurality of pixels provided to the substrate, a plurality of mounting electrodes and a plurality of light-emitting elements provided to the pixels, a first region provided at a center part of a display region of the substrate, and a second region provided closer to an outer end of the substrate than the first region in the display region of the substrate. Number of the mounting electrodes included in each of the pixels in the first region is equal to number of the mounting electrodes included in each of the pixels in the second region, and number of the light-emitting elements included in each of the pixels in the first region is larger than number of the light-emitting elements included in each of the pixels in the second region.