Backlight Module Light Guide Plate Warping Prevention
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Solution Overview
Problem
Conventional backlight modules suffer from warping of the light guide plate due to heat from the light source, leading to light leakage and optical effect degradation, and the use of a thick heat sink complicates manufacturing and assembly, especially for larger sizes.
Innovation Solution
An adjustable securing unit is employed to combine a constraining member with a carrier, allowing for adjustable distance between the constraining surface and the supporting surface of the carrier to prevent warping and enhance firmness, using a constraining member with a constraining surface and a securing unit featuring a first and second hole for precise alignment and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional frame structure is used to secure the light guide plate, then the assembly is simple, but the frame expands due to heat from the light source causing light leakage and optical effect degradation
Solution Approach 1:
The frame is divided into a first frame portion and a second frame portion that can relatively move with respect to each other. The light guide plate is clamped between these two portions, allowing the frame to accommodate thermal expansion while maintaining secure clamping of the light guide plate, thus preventing light leakage and optical effect degradation.
2Stability of the object's composition
If a thick heat sink is used to prevent light guide plate warping, then the light guide plate stability is improved, but the backlight module becomes heavier and more complex to manufacture
Solution Approach 1:
The frame is designed with movable portions that can dynamically adjust to accommodate the light guide plate of different thicknesses. The first and second frame portions can relatively move to clamp the light guide plate securely without requiring a thick heat sink, thereby maintaining stability while reducing overall structure complexity and weight.
3Manufacturing precision
If the frame is designed to accommodate precise light guide plate thickness, then the light guide plate is securely held, but manufacturing errors require rework increasing time and cost
Solution Approach 1:
The frame structure is designed to accommodate a range of light guide plate thicknesses through the relative movement of the first and second frame portions. This adjustable design allows the frame to adapt to manufacturing tolerances and variations in light guide plate thickness without requiring precise pre-matching or rework, thereby improving manufacturing efficiency.
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 prevents warping of the light guide plate, improves the overall firmness of the backlight module, and allows for thinner and lighter designs without increasing size, enhancing luminance and uniformity by up to 67.3% and 28.1% respectively compared to conventional designs.
Implementation Method 1
a light source (315) disposed on the mounting surface of the carrier (311), and adjacent to an incident surface (313a) of the light guide plate (313), and emitting light towards the light guide plate (313)
Implementation Method 2
the constraining member (317) restrains the light guide plate (313) along a first direction (D1), so as to prevent the light guide plate (313) from be deformed by heat
Implementation Method 3
while being fastened into the fixing hole (319b), the fixing member (319c) is allowed to displace within the first hole (319a) along the longitudinal axis (A1) according to the movement of the constraining member (317)
Data Source
AI summary
A light assembly, a backlight module and a liquid crystal display are described. The light assembly includes a carrier, a light guide plate, a light source, a constraining member and a securing unit. The light guide plate is disposed on the carrier and has an incident surface. The light source which emits light towards the light guide plate and is adjacent to the incident surface of the light guide plate. The constraining member is disposed above the carrier and has a constraining surface. The securing unit is used to combine the constraining member with the carrier while the light guide plate is restrained against movement by the constraining surface of the constraining member.