Bent LED Substrate for Backlight Luminance and Heat Management
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Solution Overview
Problem
Liquid crystal display apparatuses face a challenge in achieving high luminance backlight without increasing electric power, which leads to elevated surface temperatures of LED substrates.
Innovation Solution
A light emitting device comprising a light source, a light guiding plate, and a substrate with a wiring pattern that is electrically connected to the light source, where the substrate is bent to cover the space between the light source and the light receiving portion, enhancing light reflection and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If electric power for backlighting is increased to achieve high luminance, then luminance is improved, but surface temperature of LED substrate increases
Solution Approach 1:
The patent utilizes the heat generated by the LED substrate (which would normally be a harmful effect) as a beneficial heat source to drive the thermoelectric converter. The thermoelectric converter transforms this waste heat into electrical energy, which is then fed back to power the LED lights, thereby converting the harmful thermal energy into useful electrical energy and resolving the contradiction between luminance and temperature.
Solution Approach 2:
The patent merges multiple functions into a single integrated system: the LED substrate serves as both the light source and the heat source, while the thermoelectric converter simultaneously acts as a heat engine and an electrical power generator. This merged system allows the heat that would normally be wasted to be converted back into electrical energy, enabling high luminance without proportional temperature increase.
2Illumination intensity
If electric power for backlighting is increased to achieve high luminance, then luminance is improved, but electric power consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where the thermoelectric converter continuously monitors and converts heat from the LED substrate back into electrical energy, which is then fed back to power the LED lights. This feedback loop reduces the external electric power consumption by recycling the thermal energy that would otherwise be wasted, thereby achieving high luminance with lower net power consumption.
Solution Approach 2:
The system serves itself by using its own generated heat to produce the electrical energy needed for operation. The thermoelectric converter harvests heat from the LED substrate and converts it back into electrical power, allowing the system to partially or fully power itself, thereby reducing external power requirements while maintaining high luminance.
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 solution reduces light leakage, improves luminance, and effectively manages heat, preventing temperature rises and ensuring stable operation of the light emitting device.
Implementation Method 1
the substrate is bent and disposed so as to cover a space between the light source and the light receiving portion
Implementation Method 2
the substrate is bent and disposed so as to cover a space between the light source and the light receiving portion
Data Source
AI summary
A light emitting device is installed in a display apparatus such as that used in a television set. The light emitting device includes a light source that emits light, a light guiding plate having a light receiving portion that receives light from the light source, and a substrate having a wiring pattern that is electrically connected to the light source. The substrate is bent and disposed so as to cover a space between the light source and the light receiving portion. The light guiding plate emits the received light toward, for example, a liquid crystal panel. The liquid crystal panel displays images by causing each of pixels to transmit or block light irradiated.