Backlight Module Heat Dissipation and Light Collection
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Solution Overview
Problem
Backlight modules for liquid crystal displays face issues with heat dissipation and light loss due to increased LED usage, leading to reduced service life and display brightness.
Innovation Solution
A backlight module design featuring an iron frame, plastic frame with a step, flexible printed circuit board, light source with blocking walls and reflective films, and a light guide plate with a reflective layer and optical film, which enhances heat dissipation and light collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of LED lights is increased to increase brightness, then the brightness of backlight is improved, but heat generated by LED lights becomes greater and service life is adversely affected
Solution Approach 1:
The patent applies the principle of converting harm into benefit by introducing a reflective layer that transforms the harmful effect of scattered light into a beneficial effect. The reflective layer redirects light that would otherwise be lost back into the light guide plate, improving light utilization efficiency and reducing the need for additional LED lights, thereby addressing both brightness enhancement and heat generation issues simultaneously
2Illumination intensity
If the number of LED lights is increased to increase brightness, then the brightness of backlight is improved, but service life of backlight modules is adversely affected
Solution Approach 1:
The reflective layer converts scattered light into useful light, improving overall light utilization efficiency. This allows the system to achieve required brightness levels without proportionally increasing LED power consumption and heat generation, thereby extending service life while maintaining brightness requirements
3Device complexity
If light collection is not performed on LED light-emitting surfaces, then the structure is simple, but a part of light does not enter light guide plates causing overall display brightness to be lost
Solution Approach 1:
The reflective layer is positioned to capture scattered light from LED surfaces and redirect it into the light guide plate. This simple yet effective approach converts previously lost scattered light into useful illumination, improving display brightness without adding complex light collection structures
Solution Approach 2:
The reflective layer utilizes the existing scattered light from LED surfaces and redirects it back into the optical system. This self-service mechanism improves light utilization without requiring additional active components or complex control systems, maintaining structural simplicity while enhancing brightness
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 design improves heat dissipation and light collection, extending the service life of backlight modules and enhancing display brightness while reducing manufacturing costs.
Implementation Method 1
a reflective film is disposed on a side surface of the blocking wall facing the light-emitting unit
Implementation Method 2
the light guide plates are generally made of high-transmittance acrylic plastic, and their surfaces are very smooth and flat, so that the most amount of internal light can be regularly totally reflected on the flat surfaces
Implementation Method 3
a backlight module, comprising an iron frame; a plastic frame disposed on the iron frame
Data Source
AI summary
The present invention discloses to a backlight module and a display device. A flexible printed circuit board is connected to a step of a plastic frame, so that the flexible printed circuit board can be prevented from being adhered to a light guide plate, and thus a distance between a light source and an iron frame can be reduced, and heat dissipation performance of the backlight module can be enhanced. A blocking wall is disposed on each of two side faces of a light-emitting unit perpendicular to the plastic frame, and a reflective film is disposed on a side surface of the blocking wall facing the light-emitting unit, so that light emitted from the light-emitting unit can be collected and reflected, and a greater amount of light can enter the light guide plate from the light-emitting unit, enhancing luminous efficiency of the backlight module, and reducing manufacturing costs.