LCD Noise Reduction via Multi-Layer Insulation and Air Gaps
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Solution Overview
Problem
The reduction in thickness of LCD devices leads to increased vibrations caused by electric currents flowing through fluorescent lamps, resulting in noise due to the decreased distance between the balance printed circuit board (B-PCB) and the bottom cover, which is not effectively mitigated by existing insulation layers.
Innovation Solution
The implementation of multiple insulation layers and air layers between the B-PCB and the bottom cover, along with a reflective plate made of soundproof material, to absorb and reduce vibrations generated by electric currents flowing through the lamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the LCD device is made thinner by reducing the distance between the B-PCB and the bottom cover, then the device thickness is reduced, but the vibrations caused by electric currents flowing through the fluorescent lamps increase, resulting in noise
Solution Approach 1:
An insulation layer is introduced as an intermediary component between the B-PCB and the bottom cover. This insulation layer acts as a mediator that blocks the transmission path of vibrations from the fluorescent lamps to the bottom cover, thereby reducing noise while maintaining the thin device structure.
Solution Approach 2:
The patent employs a thin film insulation layer that is specifically designed to be vibration-blocking. This thin film structure effectively attenuates vibrations caused by electric currents in the fluorescent lamps without significantly increasing the overall device thickness, thus resolving the contradiction between thinness and noise reduction.
2Device complexity
If a single insulation layer is used between the B-PCB and the bottom cover, then the structure remains simple, but the vibration reduction effect is insufficient
Solution Approach 1:
The insulation structure is segmented into multiple layers rather than using a single thick layer. By dividing the insulation into multiple thinner layers, the structure achieves better vibration attenuation through cumulative damping effects while maintaining manufacturing simplicity and avoiding excessive complexity.
Solution Approach 2:
The patent uses composite insulation structures combining different materials with complementary vibration-damping properties. This composite approach enhances the overall vibration reduction capability while keeping each individual layer thin and the total structure relatively simple to manufacture.
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 significantly decreases noise levels by absorbing vibrations, as demonstrated by a reduction in noise values measured in comparison to traditional LCD devices, with the second embodiment showing a more substantial noise reduction of up to 5.2 dB.
Implementation Method 1
the insulation layer absorbs vibrations generated by electric currents flowing through the plurality of fluorescent lamps, thereby reducing noise
Data Source
AI summary
An LCD device is disclosed. The LCD device is configured to include a plurality of insulation films between a balancely printed circuit board and a bottom cover and to form a plurality of air layers between the plurality of insulation films. Accordingly, noise caused by vibrations from electric currents flowing through lamps can be minimized.