LED Light-Source Structure with Reflective Frame for Backlight Modules
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Solution Overview
Problem
Conventional LED backlight modules suffer from poor light-input efficiency due to light leakage caused by uncontrollable angles of outputted light from LEDs, leading to reduced luminous efficiency and a trade-off between increasing the light guide plate thickness for better input and maintaining the thinness required for LCDs.
Innovation Solution
Incorporating a light reflecting device made of highly reflective metal or plastic, disposed parallel to the LED light-source, with a plate-shaped frame and holding elements to reflect and direct light from the edge of the LED output surface into the light guide plate, ensuring all or most of the light is inputted into the plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the thickness of the light guide plate is increased to allow all outputted light to be inputted, then light input efficiency is improved, but the requirement for lighting and thinning the LCD is not met
Solution Approach 1:
A light reflecting device is introduced as an intermediary component between the LED light source and the light guide plate. This device includes a reflective surface that redirects light and a frame structure that guides light into the light guide plate, enabling efficient light coupling without requiring increased plate thickness
Solution Approach 2:
The light reflecting device utilizes a three-dimensional structure with vertical height to capture and redirect light from multiple angles. By adding this vertical dimension for light manipulation, the system achieves improved light input efficiency while keeping the light guide plate thin
2Productivity
If the thickness of the light guide plate is increased to prevent light leakage, then luminous efficiency is improved, but the device becomes thicker and fails to meet thinning requirements
Solution Approach 1:
The light reflecting device serves as a mediator that optimizes light distribution and prevents leakage at the edges of the light guide plate through reflective surfaces and structural guidance, achieving high luminous efficiency in a thin configuration
Solution Approach 2:
The light reflecting device applies localized light management at critical areas such as the edges and input surface of the light guide plate. By concentrating reflective and guiding functions at these specific locations, the system prevents light leakage without requiring uniform thickness increase throughout the entire plate
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 solution significantly reduces light scattering loss and improves light input efficiency by reflecting edge light and directing other light regions into the light guide plate, preventing leakage and enhancing overall luminous efficiency.
Implementation Method 1
the periphery of at least one light output opening of the light reflecting device is a plate-shaped frame for reflecting the light of the LED light-source
Data Source
AI summary
The present invention provides an LED light-source structure and a backlight module comprising an LED light-source, wherein the LED light-source structure further comprises a light reflecting device, and the light reflecting device is disposed corresponding to a light output surface of the LED light-source, and the light reflecting device has at least one light output opening, and the periphery of the light output opening is a plate-shaped frame for reflecting the light of the LED light-source, and a vertical size of the light output opening is less than a height of the light output surface of the LED light-source. With use of the present invention, all or most of the light emitted from the light output surface of the LED light-source can be inputted into a side input surface of a light guide plate (LGP), thus reducing a light scattering loss and improving a light input efficiency of the LED.