Sub-Pixel Partition Reflective Layer for High-Resolution LED Displays
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Solution Overview
Problem
Existing display apparatuses face challenges in miniaturization and high-resolution implementation due to difficulties in providing sufficient wavelength conversion material in narrow sub-pixel spaces with excessive aspect ratios, leading to issues with light efficiency and coverage.
Innovation Solution
The display apparatus incorporates a partition reflective layer with a thicker first portion on the upper surface and a thinner second portion on the sidewalls, allowing for stable accommodation of wavelength conversion material in sub-pixel spaces with low aspect ratios, enhancing light efficiency and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sub-pixel spaces are made narrow to achieve miniaturization and high resolution, then display resolution is improved, but sufficient wavelength conversion material cannot be accommodated leading to reduced light efficiency
Solution Approach 1:
The partition reflective layer is designed with non-uniform thickness, having a first portion with greater thickness and a second portion with lesser thickness. This local variation in thickness allows the structure to accommodate sufficient wavelength conversion material in narrow sub-pixel spaces while maintaining effective light reflection and conversion, thereby resolving the contradiction between high resolution (narrow sub-pixels) and light efficiency (sufficient conversion material).
Solution Approach 2:
The patent introduces a vertical dimension variation in the partition reflective layer thickness to solve the horizontal space constraint problem. By varying the thickness in the vertical direction (first portion vs. second portion), the design creates additional accommodation space for wavelength conversion material without increasing the horizontal footprint of sub-pixels, thus maintaining high resolution while improving light efficiency.
2Volume of moving object
If sub-pixel spaces are made narrow to achieve miniaturization, then device size is reduced, but wavelength conversion material accommodation becomes difficult
Solution Approach 1:
The partition reflective layer employs local quality variation with different thickness portions. The first portion has greater thickness to accommodate wavelength conversion material, while the second portion has lesser thickness. This localized thickness variation enables sufficient material accommodation in miniaturized devices without increasing overall device volume.
Solution Approach 2:
The solution transitions from horizontal space utilization to vertical space utilization by varying the partition reflective layer thickness in the vertical direction. This dimensional change allows accommodation of wavelength conversion material in the vertical dimension while maintaining compact horizontal dimensions for miniaturization.
3Ease of manufacture
If uniform thickness partition reflective layer is used, then manufacturing is simplified, but insufficient wavelength conversion material accommodation occurs in narrow sub-pixels
Solution Approach 1:
The partition reflective layer is designed with local quality variation, having a first portion with greater thickness and a second portion with lesser thickness. This non-uniform structure provides sufficient space for wavelength conversion material in narrow sub-pixels while remaining manufacturable through conventional semiconductor fabrication techniques such as selective epitaxial growth or deposition processes.
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 enables efficient light emission and improved resolution by ensuring sufficient wavelength conversion material is introduced without increasing the sub-pixel space aspect ratio, addressing the challenges of miniaturization and high-resolution display.
Implementation Method 1
a plurality of wavelength converters respectively disposed in the plurality of sub-pixel spaces
Implementation Method 2
a partition reflective layer having a first portion on an upper surface of the partition structure, and a second portion on sidewalls of the partition structure
Data Source
AI summary
A display apparatus includes a circuit board having a driving circuit, and a pixel array on the circuit board, and including pixel units including a plurality of sub-pixels. The pixel array further includes a semiconductor stack including a first semiconductor region on the circuit board and divided into a plurality of LED cells, and a second semiconductor region on the first semiconductor region and having a partition structure defining a plurality of sub-pixel spaces, a plurality of wavelength converters respectively disposed in the plurality of sub-pixel spaces, a partition reflective layer having a first portion on an upper surface of the partition structure, and a second portion on sidewalls of the partition structure, the first portion having a thickness greater than a thickness of the second portion, and a first electrode and a second electrode electrically connecting each of the plurality of LED cells to the driving circuit.