Backlight Unit Reflecting Film LED Gap Light Efficiency
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Solution Overview
Problem
The existing LED backlight units in liquid crystal display modules suffer from reduced light efficiency due to the gap between the light guide plate and the LED array, which leads to light absorption or scattering outside the optic films, resulting in increased light loss and potential heat-related damage to the light guide plate.
Innovation Solution
Incorporating a reflecting film in the upper portion of the space between the light guide plate and the LED array to prevent light leakage and absorption, ensuring that scattered light is reflected back into the light guide plate, thereby enhancing light efficiency and minimizing heat impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the LED array is spaced apart from the light guide plate, then heat damage to the light guide plate is prevented, but light efficiency is reduced due to light absorption and scattering in the gap
Solution Approach 1:
A reflecting film is introduced as an intermediary element in the gap between the LED array and light guide plate. This reflecting film intercepts light that would otherwise be lost in the gap, reflecting it back into the light guide plate, thereby preventing light energy loss while maintaining the thermal separation distance
Solution Approach 2:
The gap space, which originally causes light loss and reduced efficiency, is converted into a controlled optical path by introducing the reflecting film. The harmful effect of the gap (light absorption/scattering) is transformed into a beneficial effect (light reflection and redirection) that actually improves overall light efficiency
2Loss of energy
If the gap distance between the light guide plate and LED array is increased, then light loss is reduced, but light efficiency decreases due to increased light scattering outside the optic films
Solution Approach 1:
The reflecting film serves as a mediator that captures and redirects light within the gap region, preventing light from escaping into areas where it would be scattered or absorbed, thus maintaining high light efficiency even with increased gap distance
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 maintains light efficiency above 97% across a range of gap distances, reducing light loss to less than 3%, significantly improving the overall light efficiency of the LED backlight unit without increasing light loss, even when the gap distance increases up to 2.0 mm.
Implementation Method 1
a reflecting film corresponding to an upper portion of a space between the light guide plate and the LED array... ensuring that scattered light is reflected back into the light guide plate
Data Source
AI summary
A backlight unit comprises a reflecting plate, a light guide plate disposed over the reflecting plate, and a plurality of optic films disposed over the light guide plate. The backlight unit further comprises a lamp horizontally spaced apart from the light guide plate, and a reflecting film corresponding to an upper portion of a space between the light guide plate and the lamp.