CN203445942U - Video signal input matching circuit of vehicle-borne display - Google Patents
Video signal input matching circuit of vehicle-borne display Download PDFInfo
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- CN203445942U CN203445942U CN201320561872.6U CN201320561872U CN203445942U CN 203445942 U CN203445942 U CN 203445942U CN 201320561872 U CN201320561872 U CN 201320561872U CN 203445942 U CN203445942 U CN 203445942U
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Abstract
The utility model discloses a video signal input matching circuit of a vehicle-borne display. The video signal input matching circuit comprises a capacitor C1, a capacitor C2, a resistor R1 and a resistor R2 and is characterized in that the resistor R1 and the capacitor C2 are sequentially connected in series to a video input circuit, one ends of the capacitor C1 and the resistor R2 are connected to the circuit between the resistor R1 and the capacitor C2, and the other ends of the capacitor C1 and the resistor R2 are grounded. According to the video signal input matching circuit, interference signals are filtered by the capacitors so that image distortion caused by signal crosstalk in video equipment is avoided to a great extent; an impedance matching circuit prevents video signal reflection and loss in the transmission process and greatly improves the definition of images; and the video signal input matching circuit of the utility model is simple in structure and has only four resistor-capacitor units.
Description
Technical field
?the utility model relates to a kind of video signal input circuit, is a kind of vision signal input matching circuit of Vehicular display device specifically.
Background technology
At present, the video of Vehicular display device mainly contains LCDs, high-definition digital screen etc., and its video display effect and video input signals have very large relation.Vision signal is connected to transmit with corresponding chip interface by cable, and vision signal can be interfered in transmitting procedure, is mainly transmission cable is long or damage causes interference, electromagnetic interference and ground wire interference etc.Also having a kind of is that epd vision signal is disturbed: the interference that system often occurs, produce the reason that epd vision signal is disturbed, owing to there being two above mutual afoul ground in system, between ground and ground, there is certain voltage difference, this voltage forms disturbance current by the external shield net of signal cable, forms the vision signal of image is disturbed.The main component of earth-current is the vision signal disturbing pulse that 50 hertz of alternating currents and electric equipment produce, and the performance on image is horizontal blackstreak, distortion, disastrously mixes and have horizontal clutter, and likely vertically slowly move etc.To the channel video signal between display imaging, limited by video source, loaded down with trivial details transmitting procedure can be brought image fault, thereby carrier chrominance signal and luminance signal also can the final picture qualities of exporting of phase mutual interference impact.In high-frequency circuit, reflected signal is superimposed upon the shape that will change original signal on original signal, when if the characteristic impedance of transmission line is not mated (equating) with load impedance, at load end, will produce reflection, also can affect video quality, therefore in the urgent need to researching and developing a kind of vision signal input matching circuit, filter and disturb and prevent signal reflex, thereby improve video quality.
Utility model content
The purpose of this utility model is for above-mentioned the deficiencies in the prior art, to propose a kind of vision signal input matching circuit of Vehicular display device, this circuit has been avoided signal cross-talk in video equipment and the image fault that produces to a great extent, has greatly improved the definition of image.
Technical solution of the present utility model:
A vision signal input matching circuit, comprise capacitor C 1, capacitor C 2, resistance R 1 and resistance R 2.Wherein, resistance R 1 and capacitor C 2 are connected on video input circuit successively, and one end of capacitor C 1 and resistance R 2 is connected on the circuit between resistance R 1 and capacitor C 2, the other end ground connection of capacitor C 1 and resistance R 2.
Further, the resistance of resistance R 1 is greater than resistance R 2 resistances, and the resistance sum of resistance R 1 and resistance R 2 is between the scope of 70 ~ 80 ohm.
Further, the resistance of resistance R 1 is 47 ohm, and the resistance of resistance R 2 is 33 ohm, and C1 capacitance is 330pF, and C2 capacitance is 0.01 μ F.
Useful technique effect of the present utility model: the utility model utilizes electric capacity to filter interference signal, has avoided signal cross-talk in video equipment and the image fault that produces to a great extent; Its impedance matching circuit prevents vision signal reflection and loses in transmitting procedure, greatly improved the definition of image; Circuit structure of the present utility model is simple, only 4 Resistor-Capacitor Units.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, further illustrate the utility model:
As shown in Figure 1, the vision signal input matching circuit of the utility model Vehicular display device, comprises capacitor C 1, coupling capacitance C2, resistance R 1 and R2.Resistance R 1 and coupling capacitance C2 are connected on video input circuit successively, and one end of capacitor C 1 and resistance R 2 is connected on the circuit between resistance R 1 and capacitor C 2, the other end ground connection of capacitor C 1 and resistance R 2.Resistance R 1, resistance R 2 form line impedance match circuit, and its impedance matching circuit prevents vision signal reflection and loses in transmitting procedure, greatly improved the definition of image; The resistance of resistance R 1 is greater than resistance R 2 resistances, and resistance R 1 and resistance R 2 resistance sums are between the scope of 70 ~ 80 ohm.Wherein, the capacitor C 1 of ground connection has played the effect of signal filtering, the interference signal in vision signal input process is filtered out; The effect of coupling capacitance C2 is that video input signals is carried out to AC coupled.
Take video CVBS device as MST705 be example, resistance R 1 is chosen as 47 ohm, resistance R 2 is selected 33 ohm, capacitor C 1 is selected 330pF, capacitor C 2 selects 0.01 μ F proper, after tested, video output display best results.
Claims (3)
1. a vision signal input matching circuit for Vehicular display device, is characterized in that: comprise electric capacity (C1), electric capacity (C2), resistance (R1) and resistance (R2), resistance (R1) and electric capacity (C2) are connected on video input circuit successively; One end of electric capacity (C1) and resistance (R2) is connected on the circuit between resistance (R1) and electric capacity (C2), the other end ground connection of electric capacity (C1) and resistance (R2).
2. the vision signal input matching circuit of Vehicular display device according to claim 1, it is characterized in that: the resistance of resistance (R1) is greater than resistance (R2) resistance, and the resistance sum of resistance (R1) and resistance (R2) is between the scope of 70 ~ 80 ohm.
3. the vision signal input matching circuit of Vehicular display device according to claim 1, it is characterized in that: the resistance of resistance (R1) is 47 ohm, the resistance of resistance (R2) is 33 ohm, and the capacitance of electric capacity (C1) is 330pF, and electric capacity (C2) capacitance is 0.01 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320561872.6U CN203445942U (en) | 2013-09-10 | 2013-09-10 | Video signal input matching circuit of vehicle-borne display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320561872.6U CN203445942U (en) | 2013-09-10 | 2013-09-10 | Video signal input matching circuit of vehicle-borne display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203445942U true CN203445942U (en) | 2014-02-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320561872.6U Expired - Fee Related CN203445942U (en) | 2013-09-10 | 2013-09-10 | Video signal input matching circuit of vehicle-borne display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203445942U (en) |
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2013
- 2013-09-10 CN CN201320561872.6U patent/CN203445942U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140219 Termination date: 20150910 |
|
| EXPY | Termination of patent right or utility model |