Light Guide Plate Reflective Structures for Backlight Brightness
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Solution Overview
Problem
Conventional light source modules for LCDs have limited backlight brightness enhancement despite the use of light reflective structures on light guide plates, necessitating further improvements to increase light emitting efficiency.
Innovation Solution
The light source module incorporates a light guide plate with light reflective structures featuring closed light active regions and protrusions, where the light active region and reflecting surface are not coplanar, and the structures are formed by dot patterns that are partially overlapped or tangent, allowing for enhanced light redirection and exit through the light exiting surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light reflective structures (protrusion portions) are used on the light guide plate, then light guidance is achieved, but backlight brightness enhancement remains limited
Solution Approach 1:
The light reflective structure is segmented into multiple dot patterns arranged in arrays, where each dot pattern consists of multiple protrusions. This segmentation creates numerous light reflection points that work collectively to enhance backlight brightness and improve light emitting efficiency beyond conventional single-structure approaches.
Solution Approach 2:
Different regions of the light guide plate are equipped with dot patterns having different densities and configurations. The dot patterns are arranged with varying spacing and numbers in different areas to optimize light extraction locally, achieving superior overall brightness enhancement while maintaining uniformity.
2Ease of manufacture
If the light active region and light reflecting surface are made coplanar, then manufacturing is simplified, but light redirection efficiency is reduced
Solution Approach 1:
The light active region is positioned at a different height level than the light reflecting surface, creating a three-dimensional stepped structure. This dimensional separation allows light to be redirected more effectively through the protrusions before exiting, improving light redirection efficiency while maintaining manufacturability through mold-based formation.
3Productivity
If uniform dot patterns are used throughout the light guide plate, then manufacturing consistency is improved, but backlight uniformity is compromised
Solution Approach 1:
The dot patterns are configured with local variations in density, spacing, and arrangement across different regions of the light guide plate. These localized adjustments compensate for non-uniform light distribution, ensuring uniform backlight output while maintaining consistent manufacturing processes through standardized pattern formation methods.
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 design significantly increases light emitting efficiency by up to 10.8% compared to traditional modules, providing improved brightness and uniformity through optimized light reflective structures and their arrangement on the light guide plate.
Implementation Method 1
since the total reflection of the beam 112 in the LGP 120 is disrupted by the foregoing protrusion portions 121, the beam 112 in the LGP 120 is guided and emitted from the upper surface 122 uniformly
Implementation Method 2
the reflector 130 is usually disposed on the lower surface 124 of the LGP 120 in the light source module 100, so that a portion of the beam 112 passing through and exiting the lower surface 124 is reflected back into the LGP 120 for increasing the backlight brightness
Data Source
AI summary
A light source module including a light guide plate (LGP) and a light source device is provided. The LGP has a light exiting surface, a light reflecting surface opposite to the light exiting surface and at least one light entering surface connecting the light exiting surface and the light reflecting surface. The LGP has light reflective structures disposed on the light reflecting surface and each including a closed light active region and protrusions disposed in the light active region. The light active region and the light reflecting surface are not coplanar. The protrusions extend outward from the LGP. The light source device is disposed corresponding to the light entering surface. The light source device provides a light entering the LGP from the light entering surface and exiting the LGP from the light exiting surface after the light is redirected by one of the protrusions on the light reflecting surface.