PCB Conductive Field EMI Shielding for LCD Driving
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Solution Overview
Problem
Liquid crystal displays experience electromagnetic interference (EMI) due to electromagnetic waves generated by signal lines on printed circuit boards, which can cause malfunctions in devices and potentially affect human health.
Innovation Solution
A driving device with a conductive field on the printed circuit board, featuring a non-contact region coated with insulating material and an exposed contact region adjacent to timing controllers and memory, is used in conjunction with a shield that is electrically connected to the conductive field, effectively reducing EMI by distributing ground voltage and enlarging the ground region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signal lines are used on printed circuit boards for signal transmission, then device functionality is improved, but electromagnetic waves are generated causing electromagnetic interference
Solution Approach 1:
A ground region is introduced as an intermediary element between signal lines and surrounding components. This ground region acts as a mediator to shield electromagnetic waves generated by signal lines, preventing them from causing interference to other devices while allowing the signal lines to continue their normal operation
Solution Approach 2:
The patent utilizes the ground region to convert the harmful electromagnetic waves into a beneficial shielding effect. By strategically positioning the ground region, the electromagnetic waves are redirected to shield surrounding components rather than causing interference, effectively turning the harmful radiation into a protective mechanism
2Object-generated harmful factors
If a shield is added to reduce electromagnetic waves, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The ground region serves multiple functions simultaneously: it acts as a reference potential for electrical circuits, provides electromagnetic shielding to reduce interference, and serves as a mounting reference for components. This multi-functionality eliminates the need for separate shielding structures, reducing overall device complexity
Solution Approach 2:
The patent merges the shielding function with the existing ground structure of the printed circuit board. Instead of adding a separate shield, the ground region is integrated into the PCB design, combining the ground reference and electromagnetic shielding into a single structural element
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 significantly reduces electromagnetic wave emission from timing controllers and memory, minimizing EMI and stabilizing the ground potential, thereby preventing device malfunctions and adverse effects on human health.
Implementation Method 1
a conductive field connected to a ground voltage... distributing ground voltage and enlarging the ground region
Implementation Method 2
a shield covering the board and electrically connected to the conductive field via the conductive member... significantly reduces electromagnetic wave emission
Data Source
AI summary
A driving device including a board on which a timing controller for signal processing and a memory are mounted, the board having a conductive field, in which the conductive field has a non-contact region which is coated with an insulating material, and an exposed contact region which is not covered with the insulating material, the exposed contact region formed adjacent to the timing controller or the memory, a conductive member disposed in the exposed contact region, and a shield covering the board and electrically connected to the conductive field via the conductive member.