Backlight Module Edge Reflection Structures for Uniform Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices experience a bluing phenomenon at the edges due to nonuniform luminous flux, resulting in nonuniform display brightness, particularly with high dynamic range (HDR) technology where the edge region receives less luminous flux compared to the central region.
Innovation Solution
A backlight module with a backing plate featuring an array of light sources and reflection structures at the periphery of second light sources, which redirect light emitted by these sources away from the backing plate, increasing luminous flux at the edge region and achieving uniform brightness by redistributing light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlight modules without reflection structures are used, then the structure is simple, but the luminous flux distribution is nonuniform causing bluing phenomenon at edges
Solution Approach 1:
The patent applies local quality by placing reflection structures specifically at the edge regions of the backlight module where light deficiency occurs. The reflection structures have different configurations at different locations (first reflection structures at first edges, second reflection structures at second edges), creating localized optical modifications that address the specific luminous flux deficiency at edges without complicating the entire module structure.
Solution Approach 2:
The reflection structures serve as intermediary elements that mediate between the light sources and the edge regions. These structures intercept and redirect light paths, acting as optical intermediaries that redistribute luminous flux from areas of excess to areas of deficiency, thereby achieving uniform illumination without requiring additional light sources or complex control systems.
2Illumination intensity
If the number of LED light sources is increased to improve edge brightness, then display brightness uniformity improves, but power consumption and device complexity increase
Solution Approach 1:
The patent changes the optical parameters of the system by introducing reflection structures with specific geometric configurations and reflectivity characteristics. Instead of increasing the number of light sources (which would increase power consumption), the invention modifies the light distribution parameters through reflective surfaces, achieving improved edge brightness while maintaining the same power consumption level.
3Illumination intensity
If reflection structures are added to redirect light to edge regions, then luminous flux distribution becomes uniform, but manufacturing complexity increases
Solution Approach 1:
The patent merges the reflection structures with existing backlight module components, integrating them into the overall assembly. The reflection structures are positioned to work in conjunction with the light sources and housing, combining multiple functions (light reflection, structural support, and edge region illumination) into a unified design that simplifies manufacturing and assembly processes.
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 avoids the bluing phenomenon by ensuring consistent superimposition effects of light sources across the display, resulting in more uniform images and improved display brightness without increasing the number of LED light sources.
Implementation Method 1
Each of the reflection structures is disposed at periphery of one of the second light sources, and reflects light emitted by the one of the second light sources to a side of the one of the second light sources facing away from the backing plate
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes a backing plate. The backing plate includes a first surface and a second surface disposed oppositely to the first surface. First surface of the backing plate includes a first region and a second region surrounding the first region. The backlight module also includes a plurality of light sources disposed on the first surface of the backing plate and arranged in an array. The plurality of light sources includes a plurality of first light sources in the first region and a plurality of second light sources in the second region. The backlight module also includes a plurality of reflection structures. Each of the reflection structures is disposed at periphery of one second light source, and reflects light emitted by the second light source to a side of the second light source facing away from the backing plate.