Backlight Module Reflective Sheet Warping for Uniform Brightness
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Solution Overview
Problem
Conventional backlight modules with reflective sheets face challenges in achieving uniform brightness and efficient luminance due to the long distance between light sources, and the complex folding and assembly procedures increase manufacturing costs.
Innovation Solution
A backlight module design featuring a back plate with protrusive pieces and a reflective sheet with cutting line groups and warping portions that allow for adjustable warping to enhance luminous efficiency and simplify assembly, reducing the need for complex folding and increasing manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a reflective sheet is used to enhance luminous efficiency and uniformity, then the overall luminous efficiency is improved, but the folding and assembly procedure becomes complex and costly
Solution Approach 1:
The reflective sheet is divided into multiple sections by cutting line groups, with each section independently warping around protrusive pieces. This segmentation allows the sheet to achieve complex three-dimensional reflection surfaces through simple localized warping, reducing assembly complexity while maintaining high luminous efficiency
Solution Approach 2:
The reflective sheet automatically warps around the protrusive pieces through its own elasticity and the geometric constraint of the cutting lines, without requiring external folding operations. The protrusive pieces serve as self-aligning formers that guide the warping process, eliminating the need for complex manual or automated folding procedures
2Illumination intensity
If the reflective sheet is folded to achieve two-dimensional reflection effect, then the reflection effectiveness is improved, but the manufacturing cost increases greatly
Solution Approach 1:
The reflective sheet is designed to warp into curved surfaces around the protrusive pieces, creating three-dimensional reflection surfaces that achieve two-dimensional reflection effects. This curvature approach is simpler to manufacture than traditional folding methods, as it relies on the natural warping of the sheet material rather than precise angular folds
Solution Approach 2:
The invention changes the geometric parameters of the reflective sheet by introducing cutting line groups at specific angles and positions. These parameter changes enable the sheet to warp into desired configurations without complex folding, reducing manufacturing complexity while maintaining reflection effectiveness
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 design improves luminous efficiency and uniformity by allowing for adjustable reflective brightness and reduces manufacturing costs through simplified assembly procedures, enabling effective two-dimensional reflection and reducing the number of required light sources.
Implementation Method 1
a reflective sheet, with the reflective sheet reflecting light emitted from the light sources to the LCD panel
Implementation Method 2
Portions of the reflective sheet adjacent to the cutting line groups are warped upwards from the back plate, and respectively resist the protrusive pieces
Data Source
AI summary
A backlight module includes a back plate, light sources, protrusive pieces and a reflective sheet. The light sources are disposed on the back plate. The protrusive pieces protrude from the back plate. Each of the protrusive pieces is located between at least two adjacent light sources. The reflective sheet is disposed on the back plate and has through holes. Each of the light sources passes through a corresponding through hole. The reflective sheet further has cutting line groups. Each of the cutting line groups includes two cutting lines intersected at an intersection point. Each of the intersection points is substantially aligned with a corresponding protrusive piece. Portions of the reflective sheet adjacent to the cutting line groups are warped upwards from the back plate, and respectively resist the protrusive pieces.