Bent Light Guide Plate for Narrow Bezel LCD Backlight
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Solution Overview
Problem
The thickness constraints of the light source and heat sink in edge-lit LCD backlights limit the thinning of the bezel, restricting the design and increasing the risk of light guide plate damage due to heat expansion.
Innovation Solution
A backlight module with a bent light guide plate and a light source positioned on the backside of the backplate, allowing the light to enter through an in-light surface and exit through an out-light surface, which reduces the bezel thickness and provides increased space for heat dissipation, thereby enabling a narrower or bezel-less design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light source and light guide plate are positioned on the same side of the backplate (edge-lit configuration), then the structure is compact and easy to assemble, but the bezel thickness is constrained by the light source thickness and heat sink thickness
Solution Approach 1:
The patent transitions from a planar arrangement where the light source and light guide plate are on the same side to a three-dimensional configuration where the light guide plate is bent at an angle (e.g., 90 degrees) relative to the backplate. This dimensional change allows the light source to be positioned on one side of the backplate while the light guide plate extends to the display panel side, effectively reducing the bezel thickness constraint.
2Use of energy by moving object
If the light source is positioned close to the light guide plate, then the light coupling efficiency is high, but the heat dissipation space is insufficient and the risk of light guide plate damage from heat expansion increases
Solution Approach 1:
The patent segments the light guide plate into distinct regions: a first end face connected to the backplate, a bending part, and a second end face extending toward the display panel. This segmentation allows the light source to be positioned at a distance from the light guide plate's in-light surface, creating sufficient heat dissipation space while maintaining effective light coupling through the bent configuration.
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
This configuration allows for a thinner bezel design while enhancing heat dissipation and prolonging the service life of the light source by increasing the spacing between the light source and the in-light surface, reducing the risk of damage from heat expansion.
Implementation Method 1
a light guide plate (11) comprising a body part (110) disposed at a side of the backplate (10) facing the display panel (13)... a bending part (111) having a first end face (111a) and a second end face (111b)... the surface of the body part (110) facing away from the backplate (10) being an out-light surface
Data Source
AI summary
The backlight module includes a backplate, a light guide plate and a light source. The light guide plate includes a body part and a bending part. The body part is located on a side of the backplate facing the display panel, and a surface of the body part facing away from the backplate is an out-light surface. The bending part has a first end face and a second end face. The first end face is connected to the body part, the second end face is located on the side of the backplate facing away from the display panel and is an out-light surface. The light source is located on the side of the backplate facing away from the display panel and opposite to the second end face. The disclosure can achieve a narrower bezel design or bezel-less design.