Light Guide Plate Assembly for Precise LED Positioning
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Solution Overview
Problem
Existing light emitting modules face challenges in precisely positioning light emitting devices relative to light guide plates, leading to luminance unevenness and manufacturing inefficiencies.
Innovation Solution
A light emitting module design featuring a light guide plate with through parts, a light emitting device positioned within these parts, and a light transmissive member that fixes the device to the plate, along with reflecting members for enhanced luminance distribution, combined with a manufacturing method that includes forming reflecting members on the plate, creating through holes, adhering the plate to a sheet, and bonding the device with a transmissive member to achieve high positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light emitting device is bonded to a substrate with through holes, then the device can be positioned in the through holes, but positioning accuracy is insufficient leading to luminance unevenness
Solution Approach 1:
A positioning protrusion is provided on the light emitting device that fits into a positioning recess in the light guide plate. This mechanical intermediary feature ensures precise positioning of the light emitting device relative to the light guide plate, eliminating positioning errors and achieving uniform luminance distribution.
2Manufacturing precision
If the light emitting device is fixed using conventional bonding methods, then assembly is simple, but positioning accuracy is low
Solution Approach 1:
The fixing structure is segmented into distinct functional elements: a positioning protrusion on the light emitting device and a corresponding positioning recess in the light guide plate. This segmentation allows for precise positioning through the geometric fit of these features, while the bonding adhesive provides additional securing. The segmented approach achieves high positioning accuracy without requiring complex overall structure.
3Ease of manufacture
If through holes are formed in the light guide plate, then light emitting devices can be arranged in them, but the manufacturing process becomes more complex
Solution Approach 1:
The positioning recess is pre-formed in the light guide plate during its manufacturing process, before the light emitting devices are installed. This preliminary action of creating the positioning feature in advance simplifies the subsequent assembly process, as the light emitting devices can be directly positioned using the pre-existing recesses without requiring additional complex manufacturing steps.
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 configuration allows for precise positioning of light emitting devices on the light guide plate, reducing luminance unevenness and simplifying the manufacturing process, resulting in a more efficient and uniform planar light source.
Implementation Method 1
a light transmissive member 30 disposed on the light emitting device 20 in the through part 15 on a first face side and between the light emitting device 20 and a lateral wall of the through part 15
Implementation Method 2
a first light reflecting member 23 disposed between an upper face of the light emitting device 20 and the light transmissive member 30 while being in contact with the upper face of the light emitting device 20
Implementation Method 3
forming a light transmissive member on the light emitting device in the through hole and between the light emitting device and a lateral wall of the through hole thereby fixing the light emitting device to the light guide plate using the light transmissive member
Data Source
AI summary
A light emitting module includes a light guide plate including a first face, a second face opposing the first face, and a through part penetrating between the first face and the second face, a light emitting device disposed in the through part on a second face side, a light transmissive member disposed on the light emitting device in the through hole on a first face side and between the light emitting device and a lateral wall of the through part, and a first light reflecting member disposed between an upper face of the light emitting device and the light transmissive member while being in contact with the upper face of the light emitting device.