Current-Spreading Layer Layout for Balanced RGB Display Efficiency
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Solution Overview
Problem
Existing display devices face challenges in achieving high luminous efficiency for light-emitting elements, particularly in head-mounted displays, where the luminance and efficiency of red, green, and blue light-emitting elements are not optimally balanced.
Innovation Solution
The proposed solution involves adjusting the width of current-spreading layers for light-emitting elements to match their luminous efficiency, with wider layers for longer wavelengths to reduce side wall effects and enhance luminance, and using indium content variations in active layers to optimize emission regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the current-spreading layer width is increased to improve current distribution, then the luminous efficiency improves, but the device complexity increases due to varying widths for different wavelengths
Solution Approach 1:
The patent applies local quality by varying the width of current-spreading layers according to the specific luminous efficiency requirements of different light-emitting elements. Red light elements receive wider current-spreading layers while green and blue elements receive narrower layers, optimizing current distribution locally for each wavelength's specific needs.
Solution Approach 2:
The patent changes the geometric parameter (width) of the current-spreading layer to optimize luminous efficiency. By adjusting the width parameter differently for red, green, and blue light-emitting elements, the patent achieves improved energy conversion efficiency while managing device complexity through systematic parameter variation.
2Loss of energy
If the indium content in the active layer is increased to enhance red light emission, then the luminous efficiency for red light improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent changes the compositional parameter (indium content) of the active layer to optimize red light emission efficiency. By precisely controlling the indium content in the InGaN active layer, the patent enhances carrier confinement and radiative recombination efficiency for red light wavelengths, thereby improving luminous efficiency.
Solution Approach 2:
The patent uses composite materials by incorporating indium into the GaN-based active layer to form InGaN quantum wells. This composite structure allows for tailored optical and electrical properties, enabling enhanced red light emission through controlled indium composition while maintaining the overall semiconductor device functionality.
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 approach enhances the luminous efficiency and luminance of light-emitting elements, particularly for red, green, and blue wavelengths, improving the overall performance of display devices.
Implementation Method 1
current-spreading layers including a first current-spreading layer having a first width on the first light-emitting element and a second current-spreading layer having a second width
Implementation Method 2
light-emitting elements including a first light-emitting element for emitting light of a first wavelength and a second light-emitting element for emitting light of a second wavelength
Data Source
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AI summary
The present disclosure relates to a light-emitting element structure and a display device. The display device includes light-emitting elements including a first light-emitting element for emitting light of a first wavelength and a second light-emitting element for emitting light of a second wavelength, and including current-spreading layers including a first current-spreading layer having a first width on the first light-emitting element and a second current-spreading layer having a second width that is less than the first width on the second light-emitting element, and an insulating layer between the light-emitting elements.