Display Rear Frame Thermal Management via Segmented Mounting
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Solution Overview
Problem
The demand for thinner display apparatuses poses a challenge in reducing the temperature rise of the rear frame exposed outside, as heat from LEDs is transferred to the rear frame, potentially increasing safety risks.
Innovation Solution
A display apparatus design where the connecting parts for the back lights are only in the region covered by a rear cover, with the back light and rear frame spaced apart outside this covered region, and optionally using a heat insulating sheet or a heat sink with enhanced transverse dimensions, and incorporating slits in the rear frame to reduce heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the back light is supported by the rear frame via connecting parts, then the back light can be securely mounted, but the rear frame temperature increases due to heat transfer from the back light
Solution Approach 1:
The rear frame is divided into a covered region (where connecting parts are located) and an exposed region (where the back light is spaced apart). This segmentation isolates the heat-generating connecting parts to a specific area that is covered by the rear cover, preventing heat from spreading to the entire rear frame, especially the exposed portion.
Solution Approach 2:
A heat insulating sheet is introduced as an intermediary material between the back light and the rear frame in the exposed region. This intermediary blocks the heat transfer path from the back light to the rear frame, reducing the temperature rise in the exposed region while maintaining the structural support function.
2Loss of energy
If the rear frame is made of metal with high heat conductivity, then heat can be efficiently radiated from the back light, but the exposed region of the rear frame becomes hotter
Solution Approach 1:
Different regions of the rear frame are given different thermal properties. The covered region maintains high heat conductivity to efficiently radiate heat from the back light, while the exposed region uses heat insulating materials or spacing to prevent heat transfer, creating a localized quality difference that satisfies both heat radiation and safety requirements.
3Shape
If the back light extends beyond the covered region of the rear frame, then the design aesthetics are improved, but heat transfer to the exposed region increases
Solution Approach 1:
A heat insulating sheet is placed between the back light and the rear frame in the exposed region, acting as a thermal barrier that allows the back light to extend beyond the covered region for aesthetic purposes while preventing excessive heat transfer to the exposed area.
Solution Approach 2:
The heat transfer path is extracted or removed from the exposed region by introducing spacing and heat insulating materials, while the back light structure remains extended for aesthetic design. This separates the aesthetic function from the thermal function.
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 reduces the temperature rise inside the exposed region of the rear frame, enhancing safety and design aesthetics by minimizing heat transfer to the exterior.
Implementation Method 1
the back light and the rear frame have a heat insulating sheet therebetween outside the covered region
Implementation Method 2
the back light includes: a heat sink supported by the rear frame and capable of conducting heat to the rear frame
Data Source
AI summary
A display apparatus for displaying an image, including: a liquid-crystal panel which displays the image; a back light which emits light toward a rear face of the liquid-crystal panel; a rear frame which supports the back light via a screw; and a rear cover which covers part of a face of the rear frame which is different from a face of the rear frame on which the back light is provided, wherein the back light extends beyond an inner-frame region of the rear frame covered by the rear cover, and the screw is provided only in the inner-frame region.