Current-Spreading Layer Width Tuning for Uniform RGB Display Emission
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Solution Overview
Problem
Current display devices face challenges in optimizing the luminous efficiency of light-emitting elements, particularly for red light, due to limitations in current-spreading layer design, which affects the emission efficiency across different wavelengths.
Innovation Solution
The proposed solution involves a light-emitting element structure with varying widths of current-spreading layers for different light-emitting elements, where the width of the current-spreading layer is adjusted based on the luminous efficiency of each element, and an insulating layer is used between them, to maintain consistent luminance across different wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the width of current-spreading layer is increased to improve current distribution, then the luminous efficiency improves, but the side wall effects increase and uniformity of light emission deteriorates
Solution Approach 1:
The patent applies different width values of current-spreading layers to different light-emitting elements based on their specific luminous efficiency characteristics. Red light-emitting elements are assigned wider current-spreading layers compared to green and blue elements, creating localized structural differences that optimize current distribution for each wavelength while maintaining overall emission uniformity
Solution Approach 2:
The patent changes the width parameter of current-spreading layers according to the luminous efficiency requirements of different light-emitting elements. By adjusting this geometric parameter, the patent optimizes current spreading characteristics for red, green, and blue elements, thereby improving luminous efficiency while controlling side wall effects through parameter differentiation
2Productivity
If the width of current-spreading layer is adjusted for each light-emitting element, then the luminous efficiency is optimized, but the device structure becomes more complex
Solution Approach 1:
The patent introduces local structural variations in current-spreading layer widths tailored to specific light-emitting element positions. This localized differentiation allows optimization of luminous efficiency for red, green, and blue elements without requiring complete structural redesign, thereby managing complexity through targeted modifications rather than system-wide changes
Solution Approach 2:
The patent optimizes device performance by changing the width parameter of current-spreading layers for different light-emitting elements. This parameter adjustment approach allows independent optimization of each element's luminous efficiency while maintaining a relatively simple overall structure, avoiding the need for complex multi-component systems
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 of light-emitting elements by minimizing side wall effects and maintaining similar luminance for red, green, and blue light emissions, enabling improved performance in high-resolution displays.
Implementation Method 1
current-spreading layers including a first current-spreading layer having a first width on the first light-emitting element
Data Source
AI summary
The present disclosure relates to a light-emitting element structure and a display device. According to one or more embodiments, the display device includes a growth substrate, 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 on the growth substrate, 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.