CN204761543U - Video presentation connecting circuit - Google Patents
Video presentation connecting circuit Download PDFInfo
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- CN204761543U CN204761543U CN201520427339.XU CN201520427339U CN204761543U CN 204761543 U CN204761543 U CN 204761543U CN 201520427339 U CN201520427339 U CN 201520427339U CN 204761543 U CN204761543 U CN 204761543U
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Abstract
The utility model relates to a video presentation connecting circuit at video signal clock output port series connection magnetic bead and at data line and control line series resistor, reduces transmission line's electromagnetic radiation, with pi type circuit connect the video clock line to the input port of TFT display screen before, satisfy signal standardization one -tenth the clock signal of TFT requirement. Use low -priced flexible flat cable to connect TFT display screen and output video signal's circuit board, the utility model discloses it is a reliable and low electromagnetic radiation's video presentation connecting circuit to guarantee the lower electromagnetic radiation of product promptly, become the reliability that the clock signal that meets the demands can guarantee video signal work under the various environment again at TFT display screen input port with the signal standardization, circuit design is simple, is convenient for use.
Description
Technical field
The utility model relates to a kind of automotive electronics electromagnetic compatibility technology, particularly a kind of video display connecting circuit reducing vision signal electromagnetic radiation.
Background technology
In recent years, the development of automobile audio entertainment systems is swift and violent, the display type of man-machine interface is shown to present colorful TFT true to nature from simple monochromatic segment encode or lattice type LCD before and shows, and brings the experience of more and more extremely dazzling also bring stern challenge to the EMC Design of product simultaneously to user.Along with each car load factory is to the EMC Requirements of auto parts and components is more and more stricter and cost control requirement is also more and more higher, existing design therefore must be improved to meet the requirement of each car load factory.
Video display circuit conventional at present connects design to be had following several:
1) electromagnetic radiation of vision signal is reduced by the signal strength signal intensity reduced on whole piece video connection line.Be generally at the output series connection magnetic bead of video frequency signal processing chip and resistor and shunt capacitor over the ground, increase the rise time of signal and reduce the peak value of signal.Although this method can make the electromagnetic radiation of vision signal reduce, this way can affect signal quality, although show under normal circumstances, all are normal, hot and humid or work long hours wait extreme case under there will be the problem of display exception.
2) by flexible printed circuit board (FPC), TFT display screen is directly connected (as Fig. 1) with the circuit board of outputting video signal, this scheme can obtain good signal quality and lower electromagnetic radiation, but FPC is expensive and need and TFT screen binds together, and length that after binding together, it is fixed limits in the project that requires at other different lengths and uses.
Summary of the invention
The utility model is for video display circuit connecting circuit Problems existing, proposes a kind of video display connecting circuit, effectively reduces the electromagnetic radiation of device cost and vision signal, and reduce costs.
The technical solution of the utility model is: a kind of video display connecting circuit, video frequency processing chip is connected with TFT display screen flexible flat cable holding wire, holding wire comprises video clock line, video control line and video data line, the output terminal of clock mouth series connection magnetic bead of video frequency processing chip, before the pi-network that inductor and capacitor form is connected on video clock line to the input port of TFT display screen, suppression resistor of connecting in video control line and the every root line of video data line.
Described pi-network comprises two capacitors and an inductor, and two capacitors respectively have one end to connect earth terminal, and the other end of two capacitors is connected to the two ends of inductor.
The beneficial effects of the utility model are: the utility model video display connecting circuit is a kind ofly reliably connected design with the video display circuit of low electromagnetic; Use cheap FFC to instead of expensive FPC, reduce costs; Circuit design is simple, is convenient to application.
Accompanying drawing explanation
Fig. 1 is the circuit board schematic diagram being connected TFT display screen and outputting video signal by FPC;
Fig. 2 is the utility model video display connecting circuit structural representation;
Fig. 3 is that the utility model connects the circuit board schematic diagram of TFT display screen and outputting video signal by FFC.
Embodiment
Video display connecting circuit, at video signal clock output port series connection magnetic bead and at data wire and control line resistors in series, the electromagnetic radiation of reduction transmission line, in the clock signal that signal shaping becomes to meet the demands by the signal input port of TFT display screen.Because reduce the electromagnetic radiation of video clock signal transmission line, so the electromagnetic radiation that product is lower also can be ensured, the reliability of vision signal work under the clock signal that signal shaping becomes to meet the demands can be ensured various environment by TFT display screen input port when using cheap flexible flat cable (FFC) to connect the circuit board of TFT display screen and outputting video signal.
The utility model video display connecting circuit structural representation as shown in Figure 2, video frequency processing chip comprises video clock line, video control line and video data line (LCD [R to the holding wire of TFT display screen
0: R
7], LCD [G
0: G
7], LCD [B
0: B
7]), by magnetic bead AT
1the output terminal of clock mouth of series connection video frequency processing chip, the energy of attenuation video clock signal, inductor L
1, capacitor C
1with capacitor C
2the pi-network of composition has resonance effect, before being connected on video clock line to the input port of TFT display screen, signal shaping is become to meet the clock signal that TFT requires.Resistors in series R in video control line and the every root line of video data line
1~ R
25, inhibit the electromagnetic radiation of video control line and video data line.
As video signal clock port series connection magnetic bead AT
1after, the High frequency filter characteristic of magnetic bead makes the video clock signal energy of high frequency significantly decay, even if serious radiation (as shown in Figure 3) also externally can not be caused by common FFC winding displacement like this, but such signal does not meet the clock signal input requirements of TFT display screen, so clock signal signal shaping being become to meet the demands at the port pi-network near the input of TFT display screen.Pi-network is by inductor L
1, capacitor C
1with capacitor C
2composition, also need to do the process suppressing electromagnetic radiation to video signal data line and control line, scheme is resistors in series on the data wire and control line of vision signal simultaneously.
Design example is above only a preferred embodiment in the utility model, and other, according to design circuit of the present utility model or the design that derives, should be contained in the protection range of present patent application.
Claims (2)
1. a video display connecting circuit, it is characterized in that, video frequency processing chip is connected with TFT display screen flexible flat cable holding wire, holding wire comprises video clock line, video control line and video data line, the output terminal of clock mouth series connection magnetic bead of video frequency processing chip, before the pi-network that inductor and capacitor form is connected on video clock line to the input port of TFT display screen, suppression resistor of connecting in video control line and the every root line of video data line.
2. video shows connecting circuit according to claim 1, and it is characterized in that, described pi-network comprises two capacitors and an inductor, and two capacitors respectively have one end to connect earth terminal, and the other end of two capacitors is connected to the two ends of inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520427339.XU CN204761543U (en) | 2015-06-19 | 2015-06-19 | Video presentation connecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520427339.XU CN204761543U (en) | 2015-06-19 | 2015-06-19 | Video presentation connecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204761543U true CN204761543U (en) | 2015-11-11 |
Family
ID=54476208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520427339.XU Active CN204761543U (en) | 2015-06-19 | 2015-06-19 | Video presentation connecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204761543U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109119844A (en) * | 2018-08-31 | 2019-01-01 | 晶晨半导体(上海)股份有限公司 | Audio Interface Unit and audio frequency apparatus |
-
2015
- 2015-06-19 CN CN201520427339.XU patent/CN204761543U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109119844A (en) * | 2018-08-31 | 2019-01-01 | 晶晨半导体(上海)股份有限公司 | Audio Interface Unit and audio frequency apparatus |
| WO2020043143A1 (en) * | 2018-08-31 | 2020-03-05 | 晶晨半导体(上海)股份有限公司 | Audio interface device and audio apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |