Backlight Unit Heat Dissipation in LCD Devices
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Solution Overview
Problem
In liquid crystal display devices with a direct type backlight unit, reducing the number of LED elements to lower costs results in localized high heat generation due to increased intensity of each LED, which is not effectively dissipated.
Innovation Solution
A liquid crystal display device design featuring a reflection member with a recessed surface shape below the liquid crystal panel, where multiple LED elements are disposed on the bottom portion, and a radiator plate with a larger area than the mounting substrate but smaller than the display region, positioned under the mounting substrate to dissipate heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of LED elements is reduced to lower costs, then manufacturing cost is reduced, but localized heat generation increases due to higher intensity per LED
Solution Approach 1:
The patent applies local quality by creating a non-uniform temperature distribution management system. The controller selectively activates specific LED elements based on real-time temperature data from multiple detection points, ensuring that LEDs in cooler regions operate while those in hotter regions are deactivated. This localized control strategy resolves the contradiction by maintaining cost-effectiveness through reduced LED count while preventing localized overheating through spatially-selective operation.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the operational state of LED elements based on temperature conditions. The system monitors temperature at multiple points and changes the operational parameters (on/off state) of individual LEDs accordingly. This dynamic parameter adjustment allows the system to maintain acceptable temperature levels even with fewer, higher-intensity LEDs, thus resolving the contradiction between cost reduction and heat management.
2Device complexity
If LED elements are collectively disposed on the bottom portion to reduce cost, then device complexity is reduced, but heat dissipation becomes insufficient
Solution Approach 1:
The patent implements feedback control by incorporating multiple temperature detection points that continuously monitor the thermal state of the backlight unit. The controller receives this temperature feedback and adjusts the operation of LED elements in real-time. This feedback mechanism enables the simple collective disposal structure to achieve effective heat management, as the system can detect hot spots and adjust LED operation accordingly, resolving the contradiction between structural simplicity and heat dissipation efficiency.
Solution Approach 2:
The system applies self-service by enabling the backlight unit to autonomously manage its own thermal conditions. The temperature detection points and controller work together to automatically adjust LED operation based on actual thermal states without external intervention. This self-regulating capability allows the collectively-disposed LED structure to maintain effective heat dissipation while keeping the overall device complexity low.
3Illumination intensity
If each LED element emits light at high intensity to achieve required brightness, then illumination intensity is improved, but heat generation increases
Solution Approach 1:
The patent applies dynamics by transitioning from static LED operation to dynamic, adaptive control. Instead of all LEDs operating at constant high intensity, the system dynamically adjusts which LEDs are active based on real-time temperature conditions. The controller selectively activates LEDs in cooler regions while deactivating those in hotter regions, maintaining required brightness levels while preventing excessive heat generation. This dynamic operation strategy resolves the contradiction between illumination intensity and heat generation.
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 design effectively dissipates heat generated by the LED elements, maintaining brightness while reducing costs by minimizing the number of LEDs and improving heat dissipation efficiency.
Implementation Method 1
the radiator plate is disposed under the at least one mounting substrate... effectively dissipating heat generated by a plurality of LED elements
Implementation Method 2
the reflection member has a reflection surface which is formed to have a recess surface shape below the liquid crystal panel
Data Source
AI summary
Provided is a liquid crystal display device, including: a liquid crystal panel having a display region; and a backlight unit disposed below the liquid crystal panel, in which: the backlight unit includes: at least one mounting substrate on which light emitting diodes are mounted; a radiator plate; and a reflection member; the reflection member has a reflection surface which is formed to have a recess surface shape; the light emitting diodes on the at least one mounting substrate are disposed on a bottom portion of the reflection surface; the at least one mounting substrate is disposed at a position under the bottom portion; the radiator plate is disposed under the at least one mounting substrate; and the radiator plate has, in plan view, a larger area than the at least one mounting substrate and a smaller area than the display region.