Curved-Surface LED Structure for Wider Backlight Emission
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Solution Overview
Problem
Existing mini LED display technologies face challenges with narrow light-emitting angles and high LED counts, leading to increased production costs in backlight products.
Innovation Solution
Designing a light-emitting diode with a second semiconductor layer featuring a concave central and convex edge curved surface, and a protective layer with corresponding curved surfaces, to increase the light-emitting angle, allowing for a reduced number of LEDs in backlight products while maintaining the same backlight sense.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of LEDs is increased to ensure sufficient backlight sense, then the backlight sense is improved, but the production cost increases
Solution Approach 1:
The patent applies curvature to the light-emitting surface of the LED by designing a convex curved surface on the second semiconductor layer. This curved surface structure increases the light-emitting angle by refracting and reflecting light at different angles, allowing a single LED to illuminate a wider area. Consequently, fewer LEDs are needed to achieve the required backlight sense, reducing production costs while maintaining illumination intensity.
2Manufacturing precision
If the number of LEDs is increased to achieve fine partition control, then the partition precision is improved, but the production cost increases
Solution Approach 1:
The convex curved surface on the light-emitting layer enables each LED to cover a wider angular range, allowing finer backlight partitions to be achieved with fewer LEDs. This curvature design ensures that light is distributed more effectively across different partitions, maintaining partition precision while reducing the total LED count and associated production costs.
3Device complexity
If LEDs with narrow light-emitting angle are used, then the LED structure is simple, but the production cost increases due to higher LED count
Solution Approach 1:
The patent modifies the LED structure by adding a convex curved surface to the light-emitting layer, which increases the light-emitting angle without significantly complicating the overall device structure. This curvature can be integrated into the existing LED fabrication process, and the increased light distribution efficiency reduces the number of LEDs needed, offsetting the minor structural modification through cost savings.
4Quantity of substance
If the light-emitting angle is increased to reduce LED count, then the production cost is reduced, but the light distribution uniformity may be affected
Solution Approach 1:
The convex curved surface is designed with specific geometric parameters to optimize light distribution. The curvature radius and angle are carefully controlled to ensure that light is emitted at various angles while maintaining uniform intensity across the backlight panel. This geometric design compensates for potential non-uniformities by distributing light more evenly across different viewing angles and positions.
Solution Approach 2:
The curved surface structure creates different local light emission characteristics at different regions of the LED. The convex shape causes light rays from the center and edges to be refracted at different angles, creating a more uniform overall light distribution pattern that compensates for the increased emission angle and maintains light consistency across the backlight panel.
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 wide-angle light emission of the redesigned LED reduces production costs by minimizing the number of LEDs required, while enhancing the backlight sense and contrast ratio.
Implementation Method 1
the first central curved surface is concave towards the light-emitting layer, and the first edge curved surface is convex towards the light-emitting layer
Implementation Method 2
the first diffusion surface includes a first central curved surface and a first edge curved surface connected to the first central curved surface
Data Source
AI summary
The present application provides a light-emitting diode, a light-emitting substrate, and a display device. The light-emitting diode includes a first semiconductor layer, a light-emitting layer, a second semiconductor layer, and a first protective layer arranged in sequence. A surface of the second semiconductor layer away from the light-emitting layer is a first diffusion surface, the first diffusion surface includes a first central curved surface and a first edge curved surface connected to the first central curved surface, the first central curved surface is concave towards the light-emitting layer, and the first edge curved surface is convex towards the light-emitting layer.