Light Guide Plate Blank Areas Prevent Light Leakage
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Solution Overview
Problem
In edge-type backlight modules, the protrusions or grooves on the light guide plate can damage the lenticular structures, leading to light scattering and leakage, which affects the uniformity and efficiency of the backlight module.
Innovation Solution
A light guide plate with a main body featuring microstructures such as prisms on the light output surface and blank areas where the fixing portions engage, preventing light leakage by ensuring total internal reflection at these areas, and a method to manufacture this plate by removing microstructures from specific areas using a heated metal fixture or hot air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If protrusions or grooves are formed on the light guide plate for fixing to the back plate, then the light guide plate can be securely fixed to the back plate, but the lenticular structures are destroyed causing light scattering and leakage
Solution Approach 1:
The light guide plate is divided into a light emitting area with lenticular structures and a fixing area with protrusions/grooves. This segmentation allows the fixing structures to be isolated from the light emitting area, preventing damage to the lenticular structures while maintaining secure attachment to the back plate.
Solution Approach 2:
Different areas of the light guide plate are given different structures: the light emitting area has lenticular structures for uniform light distribution, while the fixing area has protrusions or grooves for mechanical attachment. This local differentiation ensures each area performs its specific function without interfering with the other.
2Ease of manufacture
If protrusions or grooves are formed on the light guide plate for fixing, then the light guide plate can be attached to the back plate, but light leakage occurs due to destroyed lenticular structures
Solution Approach 1:
The light guide plate is divided into a light emitting area with lenticular structures and a fixing area with protrusions/grooves. This segmentation allows the fixing structures to be isolated from the light emitting area, preventing damage to the lenticular structures while maintaining secure attachment to the back plate.
Solution Approach 2:
The potential harm of fixing structures damaging lenticular structures is converted into a benefit by strategically placing the fixing structures in blank areas where they cannot interfere with light emission, thus eliminating light leakage while maintaining easy assembly.
3Reliability
If microstructures are formed on the entire light output surface, then light uniformity is improved, but fixing structures cannot be formed for attachment to the back plate
Solution Approach 1:
The light guide plate is divided into a light emitting area with lenticular structures and a fixing area with protrusions/grooves. This segmentation allows the fixing structures to be isolated from the light emitting area, preventing damage to the lenticular structures while maintaining secure attachment to the back plate.
Solution Approach 2:
Different areas of the light guide plate are given different structures: the light emitting area has lenticular structures for uniform light distribution, while the fixing area has protrusions or grooves for mechanical attachment. This local differentiation ensures each area performs its specific function without interfering with the other.
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 improves the quality of the backlight module by preventing light leakage and enhancing luminous efficiency through the use of blank areas that ensure light is internally reflected, maintaining the integrity of the microstructures on the rest of the surface.
Implementation Method 1
A plurality of microstructures are formed on the rest area excluding the blank areas in the main body. The microstructures are prisms which are substantially parallel to each other along the lengthwise direction of the light output surface.
Implementation Method 2
A plurality of LEDs arranged in a straight line face and emit light toward the light incident surface... convert linear light sources or point sources into area light sources with high uniformity and brightness.
Implementation Method 3
A blank area is formed on the main body at each location where each of the locating portions mating with the corresponding fixing portion... preventing light leakage by ensuring total internal reflection at these areas.
Data Source
AI summary
The present invention discloses a light guide plate fixed to a back plate. The back plate has a plurality of fixing portions. The light guide plate includes a light incident surface, a reflective surface connected with the light incident surface, and a light output surface opposite to the reflective surface and connected with the light incident surface. The light output surface includes a main body and a plurality of locating portions mounted on the main body. The locating portions correspond to the fixing portions. The locating portions mate with the corresponding fixing portions thereby fixing the light guide plate to the back plate. A blank area is formed on the main body at each location where each of the locating portions mating with the corresponding fixing portion. A plurality of microstructures are formed on the rest area excluding the blank areas in the main body.