Backlight Module Edge Brightness via Scattering Dot Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing direct-lit backlight modules suffer from low edge brightness, resulting in poor surface uniformity of liquid crystal display panels due to the positioning of light sources and optical distances, which reduces light transmission at edge positions.
Innovation Solution
Incorporating scattering dots in specific regions of the backlight module, where their area of orthographic projection is differently designed to adjust light transmission paths, increasing light exit brightness at edge positions by reflecting and refracting light to enhance light emission from edge positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are positioned in conventional direct-lit backlight modules, then the backlight can be provided, but the edge brightness becomes relatively low resulting in poor surface uniformity
Solution Approach 1:
The patent applies local quality by differentiating the density of scattering dots across different regions of the backlight module. The scattering dot density is higher in regions farther from the light source and lower near the light source, creating localized optical properties that compensate for the light decay with distance and achieve uniform edge brightness across the entire display panel
Solution Approach 2:
The patent changes the optical parameter of light scattering by introducing scattering dots with specific density distributions. By controlling the scattering dot density as a function of position (higher density farther from light source), the patent modifies the light transmission characteristics to compensate for the natural light decay, thereby improving edge brightness and surface uniformity
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 increases light exit brightness at edge positions, improving surface uniformity by redistributing light energy, thereby optimizing the display effect without overcompensating, and reducing optical losses.
Implementation Method 1
the first structure includes scattering dots. The scattering dots are located in the first region and the second region
Implementation Method 2
adjust light transmission paths, increasing light exit brightness at edge positions by reflecting and refracting light
Implementation Method 3
adjust light transmission paths, increasing light exit brightness at edge positions by reflecting and refracting light
Data Source
AI summary
The present disclosure relates a backlight module and a display device to improve surface uniformity of the backlight module. The backlight module includes: a first region and a second region surrounding the first region; a backplate; a light source located at a side of the backplate pointing to a light exiting direction of the backlight module and also located in the first region; and a first structure located at a side of the light source away from the backplate, where the first structure includes scattering dots; where the scattering dots are located in the first region and the second region, and within a unit projected area, an area of orthographic projection of the scattering dots in the first region is smaller than an area of orthographic projection of the scattering dots in the second region, or the scattering dots are located in the second region.