Liquid Crystal Display Thermal Management via Segmented Heat Dissipation Plates
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Solution Overview
Problem
In transparent liquid crystal display devices using side light type backlights, the close proximity of LEDs and driver ICs leads to high temperature issues, reducing light emitting efficiency and increasing the risk of driver IC malfunction due to heat generation, while the absence of a color filter decreases light utilization efficiency and causes thermal expansion problems.
Innovation Solution
A liquid crystal display device design featuring a TFT substrate with a display area and a terminal area for the driver IC, where a first heat dissipation plate is attached to the TFT substrate and a second heat dissipation plate supports the LEDs, with a lens guiding light and a second cover glass covering the driver IC, allowing for effective heat dissipation and increased light utilization through a bent heat dissipation plate structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If LEDs and driver IC are disposed closely to each other in a small area, then device compactness is improved, but temperature rises causing reduced light emitting efficiency and potential driver IC malfunction
Solution Approach 1:
The terminal area is divided into distinct regions: a first terminal area for the driver IC and a second terminal area for the LED, separated by a gap. This spatial segmentation prevents thermal interference between the two high-temperature components while maintaining compact overall device structure.
Solution Approach 2:
A heat dissipation plate is introduced as an intermediary component between the LED and the driver IC. The heat dissipation plate serves as a thermal mediator that conducts heat away from both components, preventing direct thermal coupling while allowing close proximity arrangement.
2Illumination intensity
If color filter is used to achieve proper color display, then display quality is improved, but light utilization efficiency decreases to 1/3
Solution Approach 1:
The color filter is completely removed from the display structure. Instead of using a color filter to achieve proper color display, the patent employs a field sequential method that eliminates the need for color filters, thereby recovering light utilization efficiency while maintaining display quality through alternative color rendering techniques.
Solution Approach 2:
The driving method is changed from conventional simultaneous color driving to field sequential driving. This parameter change in the driving mode eliminates the color filter requirement and improves light transmission efficiency, as the color information is transmitted sequentially through time-multiplexed signals.
3Use of energy by moving object
If field sequential method is used to eliminate color filter, then light utilization efficiency is improved, but high frequency driving causes increased heat generation in driver IC
Solution Approach 1:
The terminal area is segmented into separate regions for the driver IC and LED, with a gap between them. This spatial separation reduces thermal coupling and allows the driver IC to dissipate heat more effectively, mitigating the increased heat generation caused by high-frequency field sequential driving.
Solution Approach 2:
A heat dissipation plate is introduced as a thermal intermediary to conduct heat away from the driver IC. This heat dissipation structure acts as a mediator that manages the increased thermal load from high-frequency driving, preventing overheating while maintaining the benefits of field sequential color rendering.
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 design effectively suppresses temperature rises in LEDs and driver ICs, maintains high light emitting efficiency, and prevents malfunctions, while enhancing light utilization and contrast with reduced power consumption.
Implementation Method 1
a first heat dissipation plate being adhered to a back of the TFT substrate in a portion corresponding the terminal area, a second heat dissipation plate, on which the lens and the LED are disposed, being disposed at a second cover glass side
Implementation Method 2
an LED as a light source being disposed at a second edge of the lens, which is an opposing edge to the first edge of the lens
Data Source
AI summary
A display device has a display area and a terminal area, the terminal area being formed on the TFT area, in which the counter substrate does not overlap, a driver IC being disposed on the terminal area, a first heat dissipation plate being adhered to a back of the TFT substrate in a portion corresponding the terminal area, a second cover glass being disposed on the counter substrate, a first edge being disposed at an edge of the second cover glass, an LED as a light source being disposed at a second edge, which is an opposing edge to the first edge of the lens, a second heat dissipation plate, on which the lens and the LED are disposed, being disposed at a second cover glass side, in which the lens, the LED and the second heat dissipation plate are fixed to the TFT substrate through the first heat dissipation plate.