Movable Light Source Module for Thermal Expansion in Edge-Lit Displays
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Solution Overview
Problem
The existing display apparatus with an edge-type backlight unit faces issues due to thermal expansion of the light guide plate, leading to increased space between the light source and the light guide plate, resulting in decreased luminance, higher power consumption, and increased heat generation.
Innovation Solution
A display module with a movable light source module guided by a guide member that prevents movement in the Z-direction, coupled with an elastic member and a graphite sheet for heat dissipation, maintains a constant distance between the light source and the light guide plate, ensuring accurate and smooth movement during expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a predetermined gap is provided between the light source and the light guide plate to accommodate thermal expansion, then the light guide plate can expand without damage, but light loss occurs and luminance decreases
Solution Approach 1:
The light source module is designed to be movable relative to the light guide plate through a guide member mechanism. This allows the light source module to dynamically adjust its position in response to thermal expansion of the light guide plate, maintaining optimal spacing and preventing light loss while accommodating dimensional changes.
Solution Approach 2:
A guide member is introduced as an intermediary component between the light source module and the light guide plate. This guide member facilitates controlled movement and maintains proper spacing, enabling both the light source module and light guide plate to coexist without direct rigid contact, thus accommodating thermal expansion while preserving light transmission efficiency.
2Stability of the object's composition
If a predetermined gap is provided between the light source and the light guide plate, then thermal expansion is accommodated, but power consumption increases to maintain the same luminance
Solution Approach 1:
The movable light source module dynamically adjusts its position based on thermal expansion conditions, ensuring consistent light coupling efficiency. By maintaining optimal spacing through movement rather than relying on a fixed gap, the system avoids the increased power consumption that would be required to compensate for light loss from a predetermined gap.
3Stability of the object's composition
If a predetermined gap is provided between the light source and the light guide plate, then thermal expansion is accommodated, but heat generation increases due to increased power consumption
Solution Approach 1:
By enabling dynamic position adjustment of the light source module, the system maintains efficient light coupling without requiring increased power input. This prevents the cascade effect where gap accommodation through fixed spacing would lead to higher power consumption and subsequently higher heat generation.
4Illumination intensity
If the light source module is made movable to accommodate thermal expansion, then the distance between light source and light guide plate can be maintained, but the structure becomes more complex
Solution Approach 1:
The guide member serves as a simple intermediary mechanism that enables controlled movement of the light source module without requiring complex actuation systems. It provides straightforward mechanical guidance and spacing maintenance, achieving the desired functionality with minimal added structural 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 maintains constant distance, improving brightness, reducing power consumption, and minimizing heat generation while facilitating easy installation and detachment of components.
Implementation Method 1
a graphite sheet for heat dissipation
Implementation Method 2
a light guide plate for guiding the light emitted from the light source to the display panel
Implementation Method 3
a light guide plate for guiding the light emitted from the light source to the display panel
Data Source
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AI summary
Disclosed herein is a display module having a display panel having a long side and a short side and installed adjacent to at least one of a long side and a short side of the display panel, a light guide plate to guide the light emitted from the light source to the display panel, a bottom chassis disposed behind the light guide plate, and a guide member to guide the movement of the light source module in accordance with the expansion and contraction of the light guide plate. The guide member guides the light source module to move along one of the long side and the short side on which the light source module is installed. The guide member prevents the light source module from moving in the direction parallel to the other one of the long side and the short side or moving in the direction orthogonal to the long side and the short side.