Backlight Module Reflection Walls for Mini LED Halo Control
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Solution Overview
Problem
Mini LED display technology faces issues of blue edge problems and halo phenomena due to light leakage between adjacent backlight regions, leading to color deviation and reduced display quality.
Innovation Solution
A backlight module design featuring a microstructure film layer with reflection walls and wavelength conversion layers to isolate light-emitting units, using foamed reflection layers and diffusion functional layers to control light emission and distribution, ensuring uniform light output and reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If mini LED display technology is used to form backlight regions, then high contrast and wide color gamut can be achieved, but light leakage occurs between adjacent backlight regions causing halo phenomena and blue edge problems
Solution Approach 1:
The patent divides the backlight module into independent light-emitting unit groups, each surrounded by reflection walls that form separate optical cavities. This segmentation prevents light from one group from leaking into adjacent groups, eliminating halo phenomena while maintaining high brightness and color performance.
Solution Approach 2:
The patent introduces a microstructure film layer with wavelength conversion particles as an intermediary between adjacent light-emitting unit groups. This layer converts stray light wavelengths and redirects light paths, preventing blue edge effects and light leakage while maintaining overall backlight performance.
2Manufacturing precision
If light-emitting units are arranged in array to form multiple backlight regions, then display quality is improved, but light leakage between regions causes color deviation
Solution Approach 1:
The patent segments the array of light-emitting units into distinct groups, each enclosed by reflection walls. This segmentation isolates the optical paths of adjacent regions, preventing light leakage that would cause color deviation, while maintaining the array configuration needed for high display quality.
Solution Approach 2:
The patent applies different structural characteristics to different parts of the backlight module. Each light-emitting unit group has its own reflection wall structure and wavelength conversion layer configuration, optimizing local light control to prevent color deviation while maintaining overall display uniformity.
3Object-generated harmful factors
If reflection walls are added to isolate light-emitting unit groups, then light leakage is reduced, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the microstructure film layer: it serves as both the reflection wall structure and the wavelength conversion layer. This integration reduces the number of separate components needed, lowering device complexity while maintaining effective light isolation and preventing color deviation.
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 isolates backlight regions, preventing light leakage and improving display uniformity, reducing halo effects, and enhancing color accuracy and brightness uniformity across the display area.
Implementation Method 1
the microstructure film layer includes a reflection wall surrounding the first opening hole, and the reflection wall is configured to reflect light emitted by the light-emitting unit group surrounded by the reflection wall
Implementation Method 2
the microstructure film layer further includes a first wavelength conversion layer configured to convert a wavelength of light passing through the first wavelength conversion layer
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes: a circuit board, a plurality of light-emitting units and a microstructure film layer, the plurality of light-emitting units being distributed in an array on the circuit board, the plurality of light-emitting units forming a plurality of light-emitting unit groups, each light-emitting unit group including at least one light-emitting unit, the microstructure film layer being located on the circuit board and located on the same side of the circuit board as the light-emitting units, first opening holes corresponding to the light-emitting unit groups being formed in the microstructure film layer, the light-emitting unit groups being located in the first opening holes corresponding thereto; the microstructure film layer including reflection walls surrounding the first opening holes, and the reflection walls being configured for reflecting light emitted by the light-emitting unit groups surrounded thereby.