Light Guiding Plate Extending Plate Redirects Leaked Light
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Solution Overview
Problem
In liquid crystal display devices, a significant portion of light from the LED light source is wasted as it passes through the bottom and does not enter the light guiding plate, leading to reduced utilization efficiency.
Innovation Solution
A light guiding plate with an extending plate that includes a supplementary light surface perpendicular to the incident surface, allowing leaked light to be redirected and utilized, and a reflective plate is placed inside a concave portion to enhance light guidance and reduce waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional light guiding plate structure is used, then the structure is simple and easy to manufacture, but light from the LED source passes through the bottom and does not enter the light guiding plate, causing light waste and reduced utilization efficiency
Solution Approach 1:
The patent extends the light guiding plate in the vertical dimension by adding an extending plate that protrudes from the incident surface toward the LED light source. This dimensional extension creates a supplementary light surface that intercepts light in the vertical direction, allowing light that would otherwise pass through the bottom to be redirected into the light guiding plate, thereby resolving the contradiction between structural simplicity and light utilization efficiency.
Solution Approach 2:
The patent converts the harmful effect of light passing through the bottom and being wasted into a beneficial effect by using the extending plate to intercept this light. The supplementary light surface acts as a secondary entry point that captures previously wasted light and redirects it into the light guiding plate, transforming energy loss into useful illumination.
2Loss of energy
If the extending plate is added to redirect light, then light utilization efficiency is improved, but the manufacturing complexity and structural difficulty increase
Solution Approach 1:
The patent merges the extending plate with the main body of the light guiding plate to form an integrated structure. By combining these components into a single molded piece rather than separate assemblies, the design simplifies the manufacturing process while maintaining the light redirecting functionality, thus reducing the impact on ease of manufacture.
Solution Approach 2:
The extending plate serves multiple functions: it acts as a structural support element, creates a supplementary light surface for light interception, and forms a concave portion that can accommodate reflective plates. This multi-functionality reduces the need for additional separate components, thereby simplifying the overall manufacturing process despite the added complexity of the extending plate itself.
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 increases the utilization percentage of the light source by redirecting leaked light into the light guiding plate, reducing waste and enhancing the overall efficiency of the backlight module.
Implementation Method 1
an extending plate is disposed at the side of the incident surface of the light guiding plate of the backlight module, a light source is disposed between the extending plate and the incident surface, the light of the leaked part of the light source passes through the extending plate and enters the light guiding plate
Implementation Method 2
a reflective plate is disposed inside the concave portion
Data Source
AI summary
The disclosure provides a light guiding plate comprising a main body and an extending plate. The main body comprises an incident surface, an illuminating surface adjacent with the incident surface, and a bottom surface opposite to the illuminating surface. The extending plate extends from the incident surface toward the direction away from the main body. The disclosure also provides a backlight module and a display device.