Backlight Module Narrow Frame Design via Folded Reflection Sheet
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Solution Overview
Problem
Traditional backlight modules are too wide due to a thick plastic frame, leading to increased width of liquid crystal display devices, complex structures, and low light utilization efficiency, which cannot satisfy the market requirement for narrow frame designs and result in higher manufacturing costs.
Innovation Solution
A backlight module design that omits the plastic frame by using a reflection sheet and optical film sets to form an up-down engaged box structure, where the LED light source, light guide plate, and flexible print circuit are fixed inside, allowing for a narrower frame and improved light reflection, thus increasing light utilization efficiency and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a plastic frame is used in the backlight module, then the structure is stable and components are protected, but the width of the backlight module increases and the frame becomes too wide
Solution Approach 1:
The patent removes the traditional plastic frame from the backlight module structure. Instead of using a separate frame component, the reflection sheet is directly folded to form the side walls that contain the light guide plate and other components, extracting the framing function from a dedicated frame component and integrating it into the reflection sheet structure.
Solution Approach 2:
The reflection sheet serves multiple functions simultaneously: it reflects light from the light guide plate back into the plate to improve light utilization efficiency, and it is folded to form side walls that provide structural containment and protection, replacing the traditional plastic frame's structural function.
2Reliability
If a plastic frame is used in the backlight module, then components are protected and structured, but the manufacturing cost increases and the structure becomes complex
Solution Approach 1:
The patent combines the reflection function and the structural framing function into a single component - the folded reflection sheet. This merging eliminates the need for a separate plastic frame, simplifying the overall structure and reducing the number of components while maintaining both light reflection efficiency and structural protection.
Solution Approach 2:
The reflection sheet, being a flexible thin film component, is folded to form the side walls of the backlight module. This approach uses a thin film structure to provide structural containment, reducing material usage and structural complexity compared to a rigid plastic frame while maintaining protective functionality.
3Loss of energy
If a plastic frame is used in the backlight module, then the structure is complete, but light leaked from side surfaces cannot be reflected back and light utilization efficiency is low
Solution Approach 1:
The reflection sheet serves dual purposes: it provides the structural side walls through folding, and simultaneously functions as a light reflecting surface. This multi-functionality ensures that light leaked from the side surfaces of the light guide plate is reflected back into the plate, improving light utilization efficiency without adding separate reflection components.
4Length of stationary object
If the backlight module width is reduced for narrow frame design, then the aesthetic requirement is satisfied, but the structural stability and component fixation become challenging
Solution Approach 1:
By removing the traditional plastic frame and using the folded reflection sheet to form side walls, the patent achieves a narrower overall width while maintaining structural containment. The folding creates vertical side walls that provide structural support without adding horizontal width, enabling narrow frame design while preserving structural stability.
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 results in a narrower backlight module with higher light utilization efficiency and brighter displays, enabling a larger viewed image in the same screen size while reducing manufacturing costs and enhancing mechanical strength.
Implementation Method 1
the laterals of the reflection sheet contact with the light guide plate, a light leaked from side surfaces of the light guide plate can be reflected back to the light guide plate
Data Source
AI summary
A backlight module and a liquid crystal display are provided. In the backlight module, a reflection sheet and a first optical film set are designed as an up-down engaged box structure, wherein the other elements of the backlight module are fixed inside the box, so as to form the whole of the backlight module. The backlight module has advantages: narrow frame, simple structure, low cost, high light utilization efficiency. The liquid crystal display has advantages such as a narrow frame.