CN109862296A - A kind of elimination VGA display interface water ripples circuit and its working method - Google Patents
A kind of elimination VGA display interface water ripples circuit and its working method Download PDFInfo
- Publication number
- CN109862296A CN109862296A CN201910065067.6A CN201910065067A CN109862296A CN 109862296 A CN109862296 A CN 109862296A CN 201910065067 A CN201910065067 A CN 201910065067A CN 109862296 A CN109862296 A CN 109862296A
- Authority
- CN
- China
- Prior art keywords
- circuit
- common mode
- signal
- filter circuit
- sync
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a kind of elimination VGA display interface water ripples circuit and its working methods, the filter shape of special common mode, differential mode filtering and digital signal H-SYNC and V-SYNC is carried out by analog signals such as red, green, blues to VGA display interface, removal is loaded into the various interference signals in VGA display signal, so that the signal of the receiving end VGA reach display can normal acquisition display signal, to eliminate the interference sealed in by VGA display cable, to eliminate the water ripples that VGA is shown.
Description
Technical field
The invention belongs to embedded system technology fields, and in particular to a kind of elimination VGA display interface water ripples circuit
And its working method.
Background technique
It is largely used on embedded product currently based on the product of USB interface, but since embedded product is to USB interface
Point-to-point connection type is used when use unlike general purpose computer, often VGA is carried out by the way of multistage switching and connects
Mouthful connection, and the power quality of embedded product and use environment rather harsh, and digitally with casing often in every
It from state, easily causes VGA display effect poor, phenomena such as display water ripples often occurs, cause display effect poor, and it is existing
USB interface circuit be typically integrated in computer VGA display interface part, the partial circuit is past in the case where Embedded Application
Phenomena such as past water ripples that can not eliminate display.
Therefore, how improving phenomena such as VGA shows water ripples, it is ensured that display effect reaches user's acceptable degree,
Become the emphasis of those skilled in the art's technical problem urgently to be resolved and research.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of elimination VGA
Display interface water ripples circuit and its working method can effectively eliminate VGA display interface water ripple phenomenon, improve display effect
Fruit.
The invention adopts the following technical scheme:
A kind of elimination VGA display interface water ripples circuit, including red filter circuit, green filter circuit, blue filter
Wave circuit, H-SYNC filter circuit and V-SYNC filter circuit, red filter circuit, green filter circuit and blue color filtered circuit
It is separately connected after corresponding common mode filtering circuit and is exported after filter circuit again, H-SYNC filter circuit and V-SYNC filter circuit point
It is exported after filter circuit and shaping circuit again after common mode filtering circuit Lian Jie not corresponded to.
Specifically, the filter circuit that red filter circuit, green filter circuit and blue color filtered circuit are correspondingly connected with is double π
Type filter circuit.
Further, common mode inductance uses TFQ0403 type EMI filter inductance, and double π type filter circuits include 60@100MHz
Magnetic bead and two 10pF capacitors.
Specifically, the filter circuit that H-SYNC filter circuit and V-SYNC filter circuit are correspondingly connected with is π type filter circuit.
Further, common mode inductance uses TFQ0403 type EMI filter inductance, and inductance is 100 ± 20mH, π type filtering packet
The magnetic bead and two 200pF capacitors of 60@100MHz are included, shaping circuit uses 74LS14 type.
Another technical solution of the invention is, a method of eliminating VGA display interface water ripples, comprising the following steps:
S1, USB interface the corresponding red analog ground of danger signal between pass through common mode inductance and double π type filtered electricals
Eliminate common mode interference and DM EMI signal on danger signal in road；
S2, USB interface the corresponding green analog ground of green between pass through common mode inductance and double π type filtered electricals
Eliminate common mode interference and DM EMI signal in green in road；
S3, USB interface the corresponding blue analog ground of blue signal between pass through common mode inductance and double π type filtered electricals
Eliminate common mode interference and DM EMI signal on blue signal in road；
S4, USB interface H-SYNC signal it is corresponding digitally between by common mode inductance and π type filter circuit and
Shaping circuit eliminates the common mode interference and DM EMI signal on H-SYNC signal；
S5, USB interface V-SYNC signal it is corresponding digitally between by common mode inductance and π type filter circuit and
Shaping circuit eliminates the common mode interference and DM EMI signal on V-SYNC signal.
Compared with prior art, the present invention at least has the advantages that
A kind of elimination VGA display interface water ripples circuit of the present invention, three tunnel such as red, green and blue of USB interface
Analog signal eliminates the common mode interference and difference in USB interface analog signal by common mode inductance and double π type filter circuits respectively
Mould interference signal, to guarantee that the analog signal of USB interface is normal.By showing that increasing elimination VGA in access shows in VGA
Interface water ripples circuit can eliminate the water ripple phenomenon that embedded product VGA is shown, improve display effect, it is ensured that display effect
Fruit reaches user's acceptable degree.
Further, ground wire is eliminated to the simulation of USB interface by common mode inductance and differential mode capacitor with digital earth signal
On common mode interference signal and DM EMI signal, thus guarantee USB interface digitally with simulation earth signal it is normal.
Further, the two ways of digital signals such as H-SYNC, V-SYNC of USB interface pass through common mode inductance and π type filtered electrical
Road and shaping circuit eliminate the common mode interference and DM EMI signal in USB interface digital signal, to guarantee USB interface
Digital signal is normal.
In conclusion the present invention is by by three analog signals, H-SYNC such as red, green and blue in USB interface
It with two digital signals of V-SYNC and simulation is eliminated respectively with the common mode interference of digital ground and DM EMI, to improve
Phenomena such as VGA signal itself quality, elimination water ripples, it is ensured that display effect reaches requirement, the flexible in application, scope of application
Extensively, the extensive use of USB interface under embedded platform is realized, service rating reaches army's grade, can be in various adverse circumstances
Lower use.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is circuit block diagram of the present invention；
Fig. 2 is present invention processing RGB chrominance signal circuit diagram；
Fig. 3 is present invention processing H-SYNC and V-SYNC signal circuit diagram.
Specific embodiment
Referring to Fig. 1, the present invention provides a kind of elimination VGA display interface water ripples circuit, it is logical by being shown in VGA
Increase in road and eliminate VGA display interface water ripples circuit, eliminates the common mode interference and differential mode on all VGA signal transmission paths
Interference is to reach elimination water ripples.Including red filter circuit, green filter circuit, blue color filtered circuit, H-SYNC filtered electrical
Road and V-SYNC filter circuit, red filter circuit, green filter circuit and blue color filtered circuit are filtered through corresponding common mode respectively
Again through double π type filter circuit outputs after wave circuit, H-SYNC filter circuit and V-SYNC filter circuit are respectively through corresponding common mode
Exported after π type filter circuit and shaping circuit again after filter circuit, by common mode filtering to analog signal red, green, blue and
Double π type filtering, eliminate the interference signal in analog signal；Pass through the common mode filtering and the filtering of π type and letter to digital signal simultaneously
The interference signal in digital signal is eliminated in number shaping so that the signal of the receiving end VGA reach display can normal acquisition display
Signal shows that the interference that cable seals in improves display effect to eliminate the water ripples that VGA is shown by VGA to eliminate
Fruit.
A kind of working method for eliminating VGA display interface water ripples circuit of the present invention, comprising the following steps:
S1, USB interface the corresponding red analog ground of danger signal between pass through common mode inductance and double π type filtered electricals
The common mode interference and DM EMI signal on danger signal are eliminated in road；
S2, USB interface the corresponding green analog ground of green between pass through common mode inductance and double π type filtered electricals
The common mode interference and DM EMI signal in green are eliminated in road；
S3, USB interface the corresponding blue analog ground of blue signal between pass through common mode inductance and double π type filtered electricals
The common mode interference and DM EMI signal on blue signal are eliminated in road；
S4, USB interface H-SYNC signal it is corresponding digitally between by common mode inductance and π type filter circuit and
Shaping circuit eliminates the common mode interference and DM EMI signal on H-SYNC signal；
S5, USB interface V-SYNC signal it is corresponding digitally between by common mode inductance and π type filter circuit and
Shaping circuit eliminates the common mode interference and DM EMI signal on V-SYNC signal.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being described and shown in usually here in attached drawing is real
The component for applying example can be arranged and be designed by a variety of different configurations.Therefore, below to the present invention provided in the accompanying drawings
The detailed description of embodiment be not intended to limit the range of claimed invention, but be merely representative of of the invention selected
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Embodiment
Referring to Fig. 2, passing through common mode inductance and double π between the corresponding red analog ground of the danger signal of USB interface
Type filter circuit eliminates the common mode interference and DM EMI signal on danger signal；Common mode inductance is filtered using TFQ0403 type EMI
Wave inductance, the filtering of π type are formed using the magnetic bead and two 10pF capacitors of 60 100MHz；
Referring to Fig. 2, passing through common mode inductance and double π between the corresponding green analog ground of the green of USB interface
Type filter circuit eliminates the common mode interference and DM EMI signal in green；Common mode inductance is filtered using TFQ0403 type EMI
Wave inductance, the filtering of π type are formed using the magnetic bead and two 10pF capacitors of 60 100MHz；
Referring to Fig. 2, passing through common mode inductance and double π between the corresponding blue analog ground of the blue signal of USB interface
Type filter circuit eliminates the common mode interference and DM EMI signal on blue signal；Common mode inductance is filtered using TFQ0403 type EMI
Wave inductance, the filtering of π type are formed using the magnetic bead and two 10pF capacitors of 60 100MHz；
Referring to Fig. 3, the H-SYNC signal of USB interface it is corresponding digitally between filtered by common mode inductance and π type
Wave circuit and shaping circuit eliminate the common mode interference and DM EMI signal on H-SYNC signal；Common mode inductance uses
TFQ0403 type EMI filter inductance, the filtering of π type are formed using the magnetic bead and two 200pF capacitors of 60 100MHz, and shaping circuit is adopted
Use 74LS14；
Referring to Fig. 3, the V-SYNC signal of USB interface it is corresponding digitally between filtered by common mode inductance and π type
Wave circuit and shaping circuit eliminate the common mode interference and DM EMI signal on V-SYNC signal；Common mode inductance uses
TFQ0403 type EMI filter inductance, inductance are 100 ± 20mH, and the filtering of π type uses the magnetic bead and two 200pF of 60@100MHz
Capacitor composition, shaping circuit use 74LS14.
In embedded computer application, it often will appear VGA and show the phenomenon that there are water ripples, by showing
Increase the circuit in the product of water ripples, runs profession display test software, increased by observation and eliminate VGA display interface ripples
Display effect before and after line circuit, it is evident that water ripples have clear improvement.
Test result shows
Circuit application is simple, and performance is stablized, and can effectively eliminate the water ripples of USB interface.This product possess it is small in size, make
With the advantages that convenient, simple and reliable.It can be applied to various embedded application occasions, wide market.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (6)
1. a kind of elimination VGA display interface water ripples circuit, which is characterized in that including red filter circuit, green filtered electrical
Road, blue color filtered circuit, H-SYNC filter circuit and V-SYNC filter circuit, red filter circuit, green filter circuit and indigo plant
Color filter circuit is separately connected after corresponding common mode filtering circuit and exports after filter circuit again, H-SYNC filter circuit and V-SYNC
Filter circuit is separately connected after corresponding common mode filtering circuit and exports after filter circuit and shaping circuit again.
2. elimination VGA display interface water ripples circuit according to claim 1, which is characterized in that red filter circuit,
The filter circuit that green filter circuit and blue color filtered circuit are correspondingly connected with is double π type filter circuits.
3. elimination VGA display interface water ripples circuit according to claim 2, which is characterized in that common mode inductance uses
TFQ0403 type EMI filter inductance, double π type filter circuits include the magnetic bead and two 10pF capacitors of 60@100MHz.
4. elimination VGA display interface water ripples circuit according to claim 1, which is characterized in that H-SYNC filtered electrical
The filter circuit that road and V-SYNC filter circuit are correspondingly connected with is π type filter circuit.
5. elimination VGA display interface water ripples circuit according to claim 4, which is characterized in that common mode inductance uses
TFQ0403 type EMI filter inductance, inductance are 100 ± 20mH, and the filtering of π type includes the magnetic bead and two 200pF of 60@100MHz
Capacitor, shaping circuit use 74LS14 type.
6. a kind of method for eliminating VGA display interface water ripples, which is characterized in that using described in any one of any one of claims 1 to 55
Elimination VGA display interface water ripples circuit, comprising the following steps:
S1, USB interface the corresponding red analog ground of danger signal between disappeared by common mode inductance and double π type filter circuits
Except the common mode interference and DM EMI signal on danger signal；
S2, USB interface the corresponding green analog ground of green between disappeared by common mode inductance and double π type filter circuits
Except the common mode interference and DM EMI signal in green；
S3, USB interface the corresponding blue analog ground of blue signal between disappeared by common mode inductance and double π type filter circuits
Except the common mode interference and DM EMI signal on blue signal；
S4, USB interface H-SYNC signal it is corresponding digitally between pass through common mode inductance and π type filter circuit and shaping
Circuit eliminates the common mode interference and DM EMI signal on H-SYNC signal；
S5, USB interface V-SYNC signal it is corresponding digitally between pass through common mode inductance and π type filter circuit and shaping
Circuit eliminates the common mode interference and DM EMI signal on V-SYNC signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910065067.6A CN109862296A (en) | 2019-01-23 | 2019-01-23 | A kind of elimination VGA display interface water ripples circuit and its working method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910065067.6A CN109862296A (en) | 2019-01-23 | 2019-01-23 | A kind of elimination VGA display interface water ripples circuit and its working method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109862296A true CN109862296A (en) | 2019-06-07 |
Family
ID=66895761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910065067.6A Pending CN109862296A (en) | 2019-01-23 | 2019-01-23 | A kind of elimination VGA display interface water ripples circuit and its working method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109862296A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110992870A (en) * | 2019-12-24 | 2020-04-10 | 昆山国显光电有限公司 | Drive chip and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6091942A (en) * | 1996-12-02 | 2000-07-18 | Motorola, Inc. | Self gain aligning circuit and method |
| JP2003009072A (en) * | 2001-06-27 | 2003-01-10 | Sharp Corp | Agc circuit and image recorder |
| CN105812700A (en) * | 2014-12-31 | 2016-07-27 | 深圳市巨烽显示科技有限公司 | VGA interface circuit preventing water ripple of display and water ripple preventing display |
| CN205755038U (en) * | 2016-05-31 | 2016-11-30 | 福建捷联电子有限公司 | A kind of PCB reducing the interference of VGA water ripples |
| CN107358919A (en) * | 2017-08-29 | 2017-11-17 | 深圳市佳彩光电科技有限公司 | A kind of OLED screen curtain grey menu water ripples suppress and removal device |
-
2019
- 2019-01-23 CN CN201910065067.6A patent/CN109862296A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6091942A (en) * | 1996-12-02 | 2000-07-18 | Motorola, Inc. | Self gain aligning circuit and method |
| JP2003009072A (en) * | 2001-06-27 | 2003-01-10 | Sharp Corp | Agc circuit and image recorder |
| CN105812700A (en) * | 2014-12-31 | 2016-07-27 | 深圳市巨烽显示科技有限公司 | VGA interface circuit preventing water ripple of display and water ripple preventing display |
| CN205755038U (en) * | 2016-05-31 | 2016-11-30 | 福建捷联电子有限公司 | A kind of PCB reducing the interference of VGA water ripples |
| CN107358919A (en) * | 2017-08-29 | 2017-11-17 | 深圳市佳彩光电科技有限公司 | A kind of OLED screen curtain grey menu water ripples suppress and removal device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110992870A (en) * | 2019-12-24 | 2020-04-10 | 昆山国显光电有限公司 | Drive chip and display device |
| US11776455B2 (en) | 2019-12-24 | 2023-10-03 | Kunshan Go-Visionox Opto-Electronics Co., Ltd | Driving chip and display apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109862296A (en) | A kind of elimination VGA display interface water ripples circuit and its working method | |
| CN103489427B (en) | YUV converts the method and system that RGB and RGB converts YUV to | |
| CN103531977B (en) | Data transmission line | |
| CN202564752U (en) | Front VGA cable having 260-degree annular head joint | |
| CN204732220U (en) | A kind of composite cable | |
| CN1275135C (en) | Long-distance video pattern array signal transmission device | |
| CN203590328U (en) | Signal acquisition device | |
| US10665979B2 (en) | Interface, electronic device and test method | |
| CN105611361A (en) | Method and device for connecting television to WiFi | |
| CN104821463B (en) | Dust-protection type electric interfaces | |
| CN112381728A (en) | Hyperspectral imaging signal processing system and method | |
| CN107482366A (en) | A kind of high speed connector being made up of seal assembly and line sequence adapter assembly | |
| CN210381161U (en) | Conversion system for converting RGB interface into HDMI interface | |
| CN207719806U (en) | A kind of protection circuit of car-mounted terminal | |
| CN105898178A (en) | Signal processing method and signal processor | |
| CN206004117U (en) | M.2 NVMe storage device keyset | |
| CN209250758U (en) | A kind of display circuit for detecting | |
| KR100506707B1 (en) | Connector | |
| CN103391416A (en) | Image processing method | |
| CN204857153U (en) | LCD adaptation terminal equipment's compatible output circuit | |
| CN201690531U (en) | Vehicle-mounted VGA with audio matrix switching device | |
| CN203895716U (en) | Multi-USB-interface converter | |
| CN212257824U (en) | Anti-aging high-speed connector | |
| CN203445942U (en) | Video signal input matching circuit of vehicle-borne display | |
| CN207853086U (en) | A kind of USB TYPE-C turn the connecting line of HDMI |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190607 |
|
| RJ01 | Rejection of invention patent application after publication |