How can I reduce EMI noise on my display and interface to ensure passing UL Certification requirements?
The source of most noise radiation from the display comes from the synchronization clock that runs at very high speeds. On a VGA display it runs at 25 MHz. The use of small R-C circuits or inductance on the data clock can soften the edges and lower the radiation. Shielding of the connection cable is another method to reduce noise, but it tends to be more expensive. Another technique for larger displays is to use LVDS transmission systems where the TTL signals are transmitted as low voltage differential signals. This is the technique used currently in most laptops.
It is also important to ground the display frame to a good AC signal ground. This helps contain the noise generated by the display as well as to become a shield for noise generated by electronics close to the display.
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Tianjin Right Display Co., Ltd.
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ADD:D2 Factory Building, No.7, East of Guwang Road, Jingbin Industrial Park, wuqing district, Tianjin
FAX: 301712
TEL : 022-25255909 / 18133876017
E-mail : sales@trdisplay.com
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