Mini-LED Backlight Optical Film Light Mixing
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Solution Overview
Problem
The challenge is to ensure effective light mixing in mini-LED backlight structures without diffusion plates, which are being removed to thin and partition display panels, while maintaining optimal light distribution.
Innovation Solution
A backlight structure comprising sub-millimeter light emitting diodes, a first optical film with light diffusion structures and supporting reflective structures, and a second optical film with corresponding light diffusion structures, optimized to reduce light loss and enhance mixing by geometric alignment and reflective coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If diffusion plates are removed from the backlight structure, then the display panel can be thinned and partitioned, but the light mixing effect of the backlight source deteriorates
Solution Approach 1:
The optical film is divided into multiple functional regions: light diffusion structures (first region), light reflection structures (second region), and light transmission regions (third region). This segmentation allows each region to perform its specific function optimally, achieving effective light mixing without requiring a diffusion plate, thus resolving the contradiction between panel thinning and light mixing effect.
Solution Approach 2:
Different regions of the optical film are designed with different optical properties: the first region has light diffusion capability, the second region has light reflection capability, and the third region has light transmission capability. This local differentiation of optical qualities enables the system to achieve comprehensive light mixing effect while maintaining panel thinness, solving the technical contradiction.
2Length of moving object
If optical films are placed close to or directly attached to mini-LEDs, then panel thickness is reduced, but light distribution uniformity deteriorates
Solution Approach 1:
The optical film is segmented into distinct functional regions with specific光路 control capabilities. The light diffusion structures diffuse light in specific directions, the reflection structures redirect light paths, and the transmission regions allow direct light passage. This segmentation enables effective light mixing at close proximity to mini-LEDs while maintaining uniform light distribution across the display panel.
Solution Approach 2:
The optical film acts as an intermediary between the mini-LEDs and the display panel. Through its segmented structure with diffusion, reflection, and transmission regions, it mediates the light from mini-LEDs to achieve uniform distribution, solving the problem of non-uniform light distribution that occurs when optical films are placed close to mini-LEDs.
3Device complexity
If diffusion plates are removed, then manufacturing complexity is reduced, but light loss increases
Solution Approach 1:
Multiple functions (light diffusion, light reflection, and light transmission) that would traditionally require separate components are merged into a single optical film structure. This integration reduces the number of optical components and simplifies manufacturing while minimizing light loss through optimized light path management within the unified structure.
Solution Approach 2:
The optical film is designed as a multi-functional component that simultaneously performs light diffusion, light reflection, and light transmission functions. This universality eliminates the need for multiple separate optical components, reducing manufacturing complexity while maintaining efficient light utilization and minimizing light loss.
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 solution effectively disperses light from mini-LEDs, optimizing light mixing and reducing brightness distribution, while minimizing light loss through reflective support structures, thereby improving the overall light mixing effect.
Implementation Method 1
the first surface has a plurality of first light diffusion structures
Implementation Method 2
the second surface has a plurality of first supporting reflective structures
Data Source
AI summary
A backlight structure and a display panel. The backlight structure includes a backlight source, a first optical film and a second optical film. The backlight source includes a plurality of sub-millimeter light emitting diodes disposed on the lamp panel. The first optical film includes a first surface having a plurality of first light diffusing structures and a second surface having a plurality of first supporting reflective structures. Projections of the plurality of first light diffusing structures on the light panel separates from projections of the plurality of first supporting reflective structures on the light panel.