Embedded Light Source Cavity in Light Guide Plate
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Solution Overview
Problem
Conventional light guide plates face challenges in reducing thickness while maintaining effective light entry and uniform light emission, leading to reduced luminance and increased volume in display devices due to non-uniform surface light sources and light leakage.
Innovation Solution
A light guide device with an embedded light source and reflective treatment, featuring a cavity on the bottom surface and coated reflective materials on internal surfaces to enhance light emission and utilization, allowing for a thinner design without increasing the distance between the light source and the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of the light guide plate is reduced, then the volume of the display device is reduced, but the light utilization rate decreases and luminance uniformity deteriorates
Solution Approach 1:
The patent transitions from conventional side-lighting geometry to a bottom-lighting configuration with the light source embedded in the light guide plate. This dimensional reorganization allows light to enter the light guide plate from the bottom surface rather than the side, improving light coupling efficiency and utilization rate while enabling thinner overall device design.
Solution Approach 2:
The light source is embedded within a cavity formed in the light guide plate itself, nesting the light source structure within the light guide plate body. This integration eliminates the need for separate lamp holders and fixing structures, reducing overall device volume while maintaining effective light entry into the light guide plate.
2Illumination intensity
If the light source is positioned closer to the light incident surface, then the luminance of the light emitting surface is improved, but light leakage occurs on the side of the non light-emitting region
Solution Approach 1:
The patent converts the previously harmful light leakage issue into a beneficial feature by strategically positioning the light source within a cavity on the bottom surface. The cavity structure with reflective walls redirects light that would have leaked sideways to instead enter the light guide plate effectively, transforming energy loss into useful light transmission.
3Reliability
If additional fixing structures such as lamp holders are added, then the light source can be securely mounted, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the light source mounting function directly into the light guide plate structure by forming a cavity within the plate itself. This integration combines the structural support and light source positioning functions into a single component, eliminating the need for separate lamp holders and fixing structures, thereby reducing device complexity and manufacturing cost while maintaining reliable light source mounting.
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 increases light utilization rate, reduces manufacturing costs, and achieves more uniform luminance, enabling a more compact and efficient backlight module with improved light distribution.
Implementation Method 1
the relative reflection treatment are for increasing the light utilization rate
Data Source
AI summary
A light guide device and a light guide plate using the same are provided. The light guide device has a first surface, a second surface, and a bottom surface. The first surface, the second surface, and the bottom surface define the internal part of the light guide device. The bottom surface has a cavity. When a light source in the cavity generates light, the light from the internal part of the light guide device is emitted via the first surface.