Light Guide Plate Protrusion for Thermal Expansion Management
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Solution Overview
Problem
Conventional lighting devices suffer from damage to light emitting devices due to movement or expansion of the light guide plate, which is not securely attached to the circuit board, leading to frequent damage from external impacts and heat-generated expansion.
Innovation Solution
The light guide plate is designed with a protruding portion that spaces it apart from the circuit board, forming a protruding structure on one surface corresponding to regions between light emitting devices, allowing for secure separation and reduced contact, and optionally using adhesive materials for stable attachment, thereby preventing damage to the light emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light guide plate is securely attached to the circuit board, then the light emitting devices are protected from movement damage, but the light guide plate cannot expand freely due to heat, causing stress and potential damage to the light emitting devices
Solution Approach 1:
The light guide plate is divided into a first region and a second region separated by a groove. The first region is attached to the circuit board while the second region remains unattached, allowing differential behavior between the two regions regarding heat expansion and mechanical support.
Solution Approach 2:
Different regions of the light guide plate have different attachment states: the first region (containing the groove) is attached to provide structural support and protection from movement, while the second region is unattached to allow free thermal expansion without generating stress.
2Object-affected harmful factors
If the light guide plate is not attached to the circuit board, then heat-induced expansion is prevented, but the light guide plate becomes movable and susceptible to external impacts that damage the light emitting devices
Solution Approach 1:
The light guide plate is segmented into attached and unattached regions through the groove, enabling the attached first region to provide impact protection while the unattached second region accommodates thermal expansion.
Solution Approach 2:
The light guide plate exhibits spatially varying attachment properties: the first region provides mechanical stability against impacts, while the second region provides thermal freedom, resolving the contradiction between impact protection and heat expansion prevention.
3Reliability
If a separate spacing member is used to space the light guide plate from the circuit board, then the light emitting devices are protected from damage, but the device complexity increases
Solution Approach 1:
The spacing function is merged into the light guide plate itself by forming a groove as an integral part of its structure. This eliminates the need for separate spacing members while maintaining the protective spacing between the light guide plate and circuit board.
Solution Approach 2:
The groove structure serves multiple functions: it acts as a spacing element to prevent direct contact, provides a region for adhesive application, and creates the segmentation necessary for differential thermal expansion. This multi-functionality reduces overall device complexity.
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 effectively protects light emitting devices from external impacts and heat-induced expansion of the light guide plate, ensuring their integrity without requiring a separate spacing member and reducing the risk of damage to the circuit board.
Implementation Method 1
when the lighting device is operated, the light guide plate 200 expands due to heat generated from the light emitting devices 120
Data Source
Figure 1
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Figure 4~5
AI summary
Provided are a lighting device and a flat panel display having the lighting device, the lighting device, including: a support substrate (110); a circuit board (100) on the support substrate (110); light emitting devices (120) mounted on the circuit board (100); and a light guide plate (200) having a protruding portion (210) protruding to a remaining region except for a region in which the light emitting devices (120) are disposed.