Reflective Electrode Pattern for Micro-LED Light Efficiency
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Solution Overview
Problem
Micro-LED display devices face challenges in achieving high light efficiency and black reflection visibility due to the use of high reflectance reflective plates, which can lead to increased light reflectance and deteriorated black reflection visibility, especially in displays without polarizers.
Innovation Solution
A display panel and device design featuring a reflective electrode layer with a pattern corresponding to the lower surface of the light-emitting element, which has higher reflectance than the reflective plate, and a fixing layer acting as a low-reflectance constituent layer, optimizing light efficiency and reflectance while minimizing the impact of transfer alignment margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a reflective plate with high reflectance is disposed in a larger area to improve light efficiency, then light efficiency is improved, but black reflection visibility is deteriorated
Solution Approach 1:
The patent applies local quality by creating different reflectance characteristics in different regions: the reflective plate has high reflectance in the pixel area (to improve light efficiency) but low reflectance in the non-pixel area (to maintain black reflection visibility). This spatial differentiation of optical properties resolves the contradiction between overall light efficiency and local black display quality.
2Manufacturing precision
If the reflective plate area is increased to account for transfer alignment margin, then transfer process robustness is improved, but black reflection visibility is deteriorated due to increased light reflectance
Solution Approach 1:
The patent resolves this contradiction by making the reflective plate area larger than the pixel area (providing alignment margin) while simultaneously making the non-pixel area have low reflectance. This allows the manufacturing tolerance to be accommodated without compromising black reflection visibility, as the extended reflective area only affects non-critical regions.
3Use of energy by moving object
If a reflective plate with high reflectance is used, then light efficiency is improved, but additional layers or structures may be needed to maintain black reflection visibility, increasing device complexity
Solution Approach 1:
The patent applies multi-functionality by making the reflective plate serve dual purposes: it provides high reflectance for light efficiency in the pixel area, and simultaneously acts as a low-reflectance element in the non-pixel area to maintain black reflection visibility. This eliminates the need for separate structures or layers, reducing device complexity while achieving both goals.
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 design enhances light efficiency and reflectance of the light-emitting element, improves black reflection visibility, and increases process efficiency by eliminating the need for additional electrodes and reducing the size of the reflective plate, resulting in a low-power and eco-friendly display solution.
Implementation Method 1
the reflective electrode layer has a reflectance of light of a wavelength 550 nm greater than a reflectance of light of a wavelength 550 nm of the reflective plate
Implementation Method 2
The micro-LED element is a semiconductor light-emitting element that emits light when current flows in a semiconductor
Data Source
AI summary
Disclosed are a display panel and a display device in which a reflective electrode layer having a pattern corresponding to a lower surface of a light-emitting element is disposed under the light-emitting element. Thus, light efficiency and light reflectance of an area corresponding to the light-emitting element are increased while a reflectance is lowered in an area other than the area corresponding to the light-emitting element. Thus, light efficiency and light reflectance of the light-emitting element are increased while improving black reflection visibility.