Conductive Adhesive Shielding for LCD EMI Protection
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Solution Overview
Problem
Liquid crystal display (LCD) devices experience driving failure due to electromagnetic interference (EMI) from externally supplied pixel data, which distorts signals generated by the timing controller.
Innovation Solution
A conductive adhesive member is used to connect the printed circuit board (PCB) to a shield case made of conductive material, discharging electromagnetic waves to ground and canceling out interference, thereby preventing EMI from affecting the LCD device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pixel data is supplied from external sources to the timing controller, then the LCD device can display images, but electromagnetic interference (EMI) occurs that distorts signals and causes driving failure
Solution Approach 1:
A shield case made of conductive material is introduced as an intermediary between the external pixel data input and the timing controller. The shield case intercepts electromagnetic waves and directs them to ground through conductive adhesive members, preventing the EMI from reaching and distorting the control signals while allowing the image display function to operate normally
2Productivity
If the timing controller processes external pixel data, then image output is enabled, but electromagnetic waves distort the control signals generated by the timing controller
Solution Approach 1:
The shield case and conductive adhesive members convert the harmful electromagnetic waves into a beneficial grounding current. By providing a low-impedance path to ground, the EMI that would otherwise distort signals is instead safely directed to ground, protecting the timing controller and other circuit boards while maintaining full signal generation capability
3Device complexity
If no shielding structure is used, then the device structure remains simple, but electromagnetic interference causes driving failure of the LCD device
Solution Approach 1:
A thin conductive shield case and flexible conductive adhesive members are used instead of bulky traditional shielding structures. This provides effective EMI protection while maintaining a compact, simple overall device structure that does not significantly increase device complexity or size
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 effectively prevents EMI from distorting signals, ensuring reliable operation of the LCD device by grounding electromagnetic waves and minimizing the risk of driving failure.
Implementation Method 1
the first conductive adhesive member discharges an electromagnetic wave from the first connector to the shield case
Implementation Method 2
a first conductive adhesive member arranged between the first connector and the shield case, wherein the first conductive adhesive member discharges an electromagnetic wave from the first connector to the shield case
Data Source
AI summary
The present invention provides a liquid crystal display device capable of protecting a printed circuit board from electromagnetic interference. The LCD device of the present invention includes a LCD panel for presenting an image, a backlight assembly for illuminating light to the LCD panel, a bottom chassis for securing the LCD panel and the backlight assembly, a first printed circuit board seated on a rear surface of the bottom chassis for generating signals to be supplied to the LCD panel on the basis of externally input signals, a first connector coupled with a signal transfer film which provides the input signal of the first printed circuit board, a shield case made of a conductive material for protecting an upper surface of the first printed circuit board, and a first conductive adhesive member interposed between the first connector and the shield case for discharging an electromagnetic wave from the first connector to the shield case.