Backlight Module Notch Design for Narrow Bezel Display
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Solution Overview
Problem
As the lower bezel of display devices narrows, the space for the arrangement of the light source set becomes limited, preventing an increase in light source density, which hinders the reduction of the bezel dimension and improvement of screen ratio.
Innovation Solution
A backlight module design featuring a back plate with a first notch dividing it into two light source regions, each equipped with a light source set, and a light guide plate with recessed portions and a protruding portion to optimize light distribution, combined with a display panel notch for chip-on-film extension, allowing for uniform light emission and reduced bezel dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the lower bezel is narrowed to improve screen ratio, then the screen ratio is improved, but the space for arranging the light source set becomes limited
Solution Approach 1:
The back plate is divided into two separate light source disposing regions by introducing a first notch, allowing light source sets to be arranged on both sides of the notch. This segmentation enables effective utilization of the limited space within the narrowed bezel structure.
Solution Approach 2:
The light source sets are arranged not only along the horizontal direction but also distributed vertically on both sides of the notch, utilizing two-dimensional space arrangement to maximize light source density within the constrained bezel area.
2Length of stationary object
If the density of light source set arrangement is increased to reduce lower bezel dimension, then the lower bezel dimension is reduced, but the arrangement space becomes insufficient
Solution Approach 1:
By segmenting the back plate into two regions separated by the notch, the patent creates multiple arrangement zones that can accommodate higher light source density without requiring excessive horizontal space, thus reducing the lower bezel dimension.
Solution Approach 2:
The patent combines light source sets from both sides of the notch to work together, merging their light output to achieve sufficient illumination while maintaining high density arrangement within the limited space.
3Illumination intensity
If the light source set arrangement is optimized to improve light uniformity, then the light uniformity is enhanced, but the structural complexity increases
Solution Approach 1:
The light guide plate incorporates localized structural features (recessed portions and protruding portions) at specific positions to optimize light distribution. These local modifications improve light uniformity without requiring complex changes to the entire backlight module structure.
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 reduces the lower bezel dimension, increases screen ratio, and enhances light uniformity, thereby improving product performance and market competitiveness.
Implementation Method 1
a light guide plate disposed on the back plate, and the light guide plate comprising a light incident surface and a light emitting surface
Implementation Method 2
the first notch is rectangular, wherein the first light source disposing region is installed with a first light source set, the second light source disposing region is installed with a second light source set, light emitting sides of the first light source set and the second light source set are both disposed opposite to the light incident surface of the light guide plate
Data Source
AI summary
The present invention provides a backlight module and a display device. A first notch is defined in a back plate of the backlight module. The first notch corresponds to a second notch defined in the display panel, and a light source set is disposed on the back plate located on two sides of the first notch, which lowers a dimension of a lower bezel of the display device and enhances a screen ratio such that light of the backlight module entering the display panel becomes more uniform, which enhances the differential performance of the products and improves the market competitiveness of the products.