Heat Radiation Sheet for LCD Thermal Management
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Solution Overview
Problem
Small-sized liquid crystal display devices face challenges in efficiently discharging heat generated by LEDs, leading to temperature rises due to the limited heat conduction efficiency of flexible printed circuits and reduced contact area of the LED substrate with heat-conductive components.
Innovation Solution
Incorporating a heat radiation sheet, such as a graphite or metal sheet, below the light guiding plate and LED substrate to effectively discharge heat generated from LEDs, enhancing heat conduction through a broader contact area with a metal lower cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a flexible printed circuit is used as the LED substrate, then the device can be made smaller and more flexible, but the heat conduction efficiency deteriorates
Solution Approach 1:
The patent combines the flexible printed circuit with a heat radiation sheet into a composite structure. The heat radiation sheet is integrated onto the flexible printed circuit, creating a dual-function component that maintains both flexibility and heat dissipation capability. This merging allows the device to remain compact while addressing the heat conduction problem.
Solution Approach 2:
The heat radiation sheet acts as an intermediary between the flexible printed circuit and the surrounding environment. It receives heat from the LED through the flexible printed circuit and radiates it away, serving as a thermal mediator that decouples the heat dissipation function from the flexible substrate.
2Device complexity
If the LED substrate has reduced contact area with heat-conductive components, then the device structure can be simplified, but the heat discharge capability deteriorates
Solution Approach 1:
The patent transitions from point-contact or small-area contact to a large-area surface contact by placing the heat radiation sheet on the flexible printed circuit. This dimensional expansion of the contact area allows for significantly improved heat discharge capability without adding structural complexity, as the sheet simply covers the existing substrate surface.
3Device complexity
If no heat radiation sheet is used, then the device structure remains simple, but temperature rise occurs at the LED mounting region
Solution Approach 1:
The patent extracts the heat radiation function from the overall device structure by introducing a dedicated heat radiation sheet. This separate component is specifically responsible for heat dissipation, allowing the rest of the device structure to remain simple while the heat radiation sheet independently addresses the temperature control problem.
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 heat radiation sheet significantly reduces the highest temperature at the LED mounting region and promotes even heat distribution across the device, preventing temperature rises and improving the overall thermal management of the liquid crystal display device.
Implementation Method 1
a heat radiation sheet below the light guiding plate and the LED substrate to discharge heat generated from the LEDs
Implementation Method 2
heat radiation sheet below the light guiding plate and the LED substrate to discharge heat generated from the LEDs
Data Source
AI summary
A display device having a heat radiation sheet to prevent temperature rise is provided. The display device includes a liquid crystal display (LCD) panel; a light emitting diode (LED) substrate on which a plurality of LEDs are mounted; a light guiding plate disposed below the LED substrate and configured to guide light emitted from the LEDs to the LED substrate; and a heat radiation sheet disposed below the light guiding plate and the LED substrate and configured to discharge heat generated from the LEDs.