Backlight Module Frame with Light-Absorbing Shelter
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Solution Overview
Problem
Conventional edge-lit backlight modules experience light leakage due to light reflection from the inner surface of the backplate's sidewall, which is not effectively addressed by existing designs.
Innovation Solution
The proposed backlight module incorporates a frame body with a concave portion that exposes the inner surface of the sidewall, featuring a protrusion portion with a shelter portion made of light-absorbent material, which bends to partially or fully cover the exposed sidewall, and an anti-reflective layer to absorb light and prevent reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the frame body has a concave portion to accommodate the protrusion portion of the optical film, then the optical film can be positioned, but light leakage occurs due to exposure of the backplate sidewall
Solution Approach 1:
A shelter portion is introduced as an intermediary element between the optical film and the backplate sidewall. This shelter portion blocks the path of light that would otherwise reflect off the exposed sidewall, thereby eliminating light leakage while preserving the positioning function of the concave portion.
Solution Approach 2:
The solution adds a new dimensional element (the shelter portion extending from the optical film) to block light paths in three-dimensional space. This creates a light-blocking structure that addresses the light leakage issue without compromising the two-dimensional positioning arrangement.
2Device complexity
If the sidewall of the backplate is exposed by the concave portion, then the frame body structure is simplified, but light reflection causes light leakage at the display panel edges
Solution Approach 1:
The shelter portion acts as a light-blocking intermediary that prevents direct interaction between the light source and the exposed sidewall. This maintains the simplified frame structure while introducing only a minimal additional element (the shelter portion) to control light paths.
Solution Approach 2:
The exposed sidewall, which originally caused light leakage, is now strategically positioned to allow the shelter portion to demonstrate its light-blocking function. The situation is converted from a problem (exposed sidewall causing reflection) to a solution opportunity (shelter portion effectively blocking light paths).
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 design significantly reduces light leakage by absorbing light that would otherwise be reflected to the edges of the display panel, enhancing the overall brightness uniformity and reducing light spots.
Implementation Method 1
the shelter portion is made of light-absorbent material and the height of the shelter portion is greater than or equal to the height of the sidewall exposed by the concave portion
Implementation Method 2
an anti-reflective layer can be disposed on one side of the shelter portion facing away from the sidewall
Data Source
AI summary
This invention provides a display device and a backlight module thereof, wherein the backlight module includes a backplate, a frame body, and a first optical film. The frame body is disposed on the backplate and extending along the inner surface of the sidewall. A concave portion is formed on the frame body and exposes the inner surface of the sidewall. The first optical film has a protrusion portion extending to the concave portion, wherein the frame body extends along the edge of the first optical film. The protrusion portion includes a main body and a shelter portion, wherein the shelter portion bends in opposition to the main body and at least partially shelter a portion of the sidewall exposed by the concave portion.