Backlight Module Light Shielding Sheet for Leakage Control
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Solution Overview
Problem
Current backlight modules in liquid crystal display devices suffer from light leakage due to light emission on opposite sides of the light source, which affects their optical performance.
Innovation Solution
A backlight module design incorporating a light guide plate, frame, light source assembly, reflective sheet, optical film, and a thin, flexible light shielding sheet that protrudes from the edge of the optical film or light guide plate to minimize light leakage by blocking light emission on opposite sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional backlight module structure is used, then the structure is simple and easy to manufacture, but light leakage occurs on opposite sides of the light source affecting optical performance
Solution Approach 1:
The light shielding function is segmented from the main structural components (light guide plate and frame) and implemented by a separate light shielding sheet. This sheet is specifically positioned at the edges of the light guide plate to block light leakage without requiring redesign of the entire backlight module structure, thus maintaining ease of manufacture while solving the light leakage problem.
Solution Approach 2:
A light shielding sheet is introduced as an intermediary component between the light guide plate and the surrounding environment. This thin sheet (thickness ≤ 0.01mm) acts as a mediator to block light that would otherwise leak from the edges of the light guide plate, preventing light from reaching the frame and being refracted into the visible area.
2Object-affected harmful factors
If a light shielding sheet with thickness ≤ 0.01mm is used, then light leakage is reduced, but the material selection and handling become more challenging
Solution Approach 1:
The patent employs a flexible light shielding sheet with thickness ≤ 0.01mm to block light leakage. The flexibility of this thin film allows it to conform to the edge geometry of the light guide plate and be easily positioned and fixed, overcoming the handling challenges associated with ultra-thin materials while maintaining effective light shielding.
Solution Approach 2:
The patent specifies a precise thickness parameter for the light shielding sheet (≤ 0.01mm) to achieve optimal light blocking performance. By controlling this dimensional parameter, the sheet is thin enough to minimize interference with light propagation in the intended direction while being thick enough to effectively block light leakage at the edges.
3Object-affected harmful factors
If the light shielding sheet protrudes from the edge of the light guide plate, then light leakage is blocked, but the structural complexity increases
Solution Approach 1:
The light shielding function is segmented into a separate protruding sheet that extends beyond the edge of the light guide plate. This segmentation allows the shielding function to be independently optimized without complicating the main light guide plate structure, as the protruding portion simply extends the shielding coverage to the necessary area.
Solution Approach 2:
The light shielding sheet is extended in the dimensional direction perpendicular to the main surface of the light guide plate, creating a protruding structure. This dimensional extension allows the sheet to block light leakage paths that would otherwise bypass the main plane of the light guide plate, effectively adding a new dimension to the light blocking strategy without significantly increasing overall structural complexity.
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 light leakage and enhances the optical performance of the backlight module by strategically placing a thin, flexible light shielding sheet to contain light emission within the intended visible area.
Implementation Method 1
The reflective sheet is disposed on the bottom surface of the light guide plate
Implementation Method 2
Light is emitted from a light guide plate body, is reflected to the frame, and is refracted to a visible area through an optical film
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes a light guide plate, a frame, a light source assembly, a reflective sheet, an optical film, and a light shielding sheet. The frame is disposed around the light guide plate. The light source assembly is disposed on a side surface of the light guide plate and fixed on the light guide plate and the frame. The reflective sheet is disposed on a bottom surface of the light guide plate. The optical film is disposed on a top surface of the light guide plate. The light shielding sheet is disposed on a surface of the optical film away from the light source assembly.