CN106791543A - A kind of technical method for realizing USB interface EDID compatibility - Google Patents
A kind of technical method for realizing USB interface EDID compatibility Download PDFInfo
- Publication number
- CN106791543A CN106791543A CN201611246646.3A CN201611246646A CN106791543A CN 106791543 A CN106791543 A CN 106791543A CN 201611246646 A CN201611246646 A CN 201611246646A CN 106791543 A CN106791543 A CN 106791543A
- Authority
- CN
- China
- Prior art keywords
- vga
- edid
- receiving devices
- signal source
- powered
- 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.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
Abstract
The present invention relates to a kind of technical method for realizing USB interface EDID compatibility, the compatible nonstandard VGA line material of in the market, the EDID circuit designs to VGA receiving terminals are changed, and by increasing a double diode and a storage capacitor, realize that VGA EDID are compatible.It is a feature of the present invention that：By increasing a double diode and a storage capacitor, the pin that VGA signal source will can set in VGA line material, for being powered to the EEPROM in VGA receiving devices；When i.e. VGA receiving devices are not powered in itself, by VGA line be transmitted through come power supply can still ensure that VGA signal source can read the information of the EDID of VGA receiving devices.
Description
Technical field
The present invention can be applicable to field of video image processing, more particularly to a kind of skill for realizing USB interface EDID compatibility
Art method.
Background technology
EDID (Extended Display Identification Data) is a kind of VESA standard data formats, wherein
Comprising the parameter about monitor and its performance, including supplier information, maximum image size, color is set, and factory default is put,
The limitation of frequency range and the character string of display title and sequence number.In USB interface, there are two pins to be defined as
DDCSDA, DDCSCL.VGA signal source reads the EDID equipment of VGA receiving terminals by the DDCSDA on VGA line material, DDCSCL.
Many originals such as existing market product, uneven and different between the distinct device electric sequence of VGA line material
Cause, causes VGA signal source to read the EDID equipment on VGA receiving devices.Normal VGA line material is 15 pins,
VGA line material in the market, manufacturer can typically delete the pin being of little use for cost consideration.In USB interface quilt
Be defined as the VGA pins of Reserve, it will usually which manufacturer saves by wire production, cause VGA signal source in VGA receiving devices not
During power supply, it is impossible to read the information of EDID.
The content of the invention
The present invention is changed to the EDID circuit designs of VGA receiving terminals, by increasing a double diode and an energy storage
Electric capacity, realizes that VGA EDID are compatible.What the method was realized in：
VGA signal source is the main equipment of DDC controllers, and address wire and clock line that main equipment passes through VGA line material read VGA and connect
The information of EDID in receiving unit；EEPROM（EEPROM）As the storage medium of EDID information, exist
In the receiving device of VGA；
By increasing a double diode and a storage capacitor, VGA signal source can draw one set in VGA line material
Pin, for being powered to the EEPROM in VGA receiving devices；
When i.e. VGA receiving devices are not powered in itself, by VGA line be transmitted through come power supply can still ensure that VGA signal source can be with
Read the information of the EDID of VGA receiving devices.
The present invention has the advantages and positive effects that：The compatible nonstandard VGA line material of in the market, to VGA receiving terminals
EDID circuit designs change, cost performance is high, system cost reduction.
Brief description of the drawings
Fig. 1 is that the present invention realizes the system pass figure that USB interface compatibility EDID reads.
Fig. 2 is that the present invention realizes USB interface compatibility EDID circuit design change figures.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, not
For limiting the present invention.
The present invention is a kind of technical method for realizing USB interface EDID compatibility, and concrete methods of realizing includes：
S1：Reference picture 2, AT24C02 is EEPROM, the information of EEPROM storage insides EDID, and BAV70 is double diode, wherein
VGA_5V be VGA signal source by pin 9 tap into come power supply；
Design double diode, realizes the function that VGA signal source and system power supply can all power to EEPROM, does not interfere with each other；
And when system is not powered, VGA pins 9 are powered, and the power supply capacity of VGA signal source is limited, and diode is realized reversely cutting
Only function；
S2：When wire rod is lack of standardization and system is not powered, EDID signal non-transformers are powered, and the I/O port of chip has weak pull-up, can
To measure voltage from the power pins of AT24C02, the level on holding wire to a certain extent can incoming power pins；
Now, holding wire can ceaselessly overturn, and it is that holding wire passes through to be transmitted inside eeprom chip that power supply is powered, power supply meeting
As holding wire overturns, EDID operation irregularities；
It is to prove validity of the present invention to carry out this step；
S3：Reference picture 2, increases C20 electric capacity in electric circuit diagram design, electric capacity plays energy storage；
When holding wire occurs upset from high to low, C20 electric capacity is discharged EEPROM to compensate, and makes the electricity of EEPROM
Pressure maintains more than 2.27V, and the operating voltage of EEPROM (AT24C02) is 1.8V to 5V, and EEPROM normal works, power supply is supplied
Electricity is holding wire by being transmitted inside eeprom chip；
VGA signal source is lack of standardization in VGA line material, and system non-transformer is when powering, and can still read EDID information, VGA receiving terminals
EDID compatibility is greatly improved.
Claims (4)
1. it is a kind of realize USB interface EDID compatibility technical method, it is characterised in that the EDID circuits to VGA receiving terminals set
Meter is changed, and by increasing a double diode and a storage capacitor, realizes that VGA EDID are compatible.
2. according to claim 1, it is characterised in that VGA signal source is the main equipment of DDC controllers, main equipment passes through VGA
The address wire and clock line of wire rod, read the information of EDID in VGA receiving devices；EEPROM（The read-only storage of electric erazable programmable
Device）As the storage medium of EDID information, it is present in the receiving device of VGA.
3. according to claim 2, it is characterised in that by increasing a double diode and a storage capacitor, VGA letters
The pin that number source can set in VGA line material, for being powered to the EEPROM in VGA receiving devices.
4. according to claim 3, it is characterised in that when VGA receiving devices are not powered in itself, by VGA line be transmitted through come
Power supply can still ensure that VGA signal source can read the information of the EDID of VGA receiving devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611246646.3A CN106791543A (en) | 2016-12-29 | 2016-12-29 | A kind of technical method for realizing USB interface EDID compatibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611246646.3A CN106791543A (en) | 2016-12-29 | 2016-12-29 | A kind of technical method for realizing USB interface EDID compatibility |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106791543A true CN106791543A (en) | 2017-05-31 |
Family
ID=58929078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611246646.3A Pending CN106791543A (en) | 2016-12-29 | 2016-12-29 | A kind of technical method for realizing USB interface EDID compatibility |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106791543A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1773447A (en) * | 2004-10-18 | 2006-05-17 | 创世纪微芯片公司 | Virtual extended display information data (EDID) in a flat panel controller |
| CN1917032A (en) * | 2005-08-18 | 2007-02-21 | 明基电通股份有限公司 | Display screen, and method for reading and writing extension of displaying identified data |
| CN101883204A (en) * | 2009-05-05 | 2010-11-10 | 康佳集团股份有限公司 | TV EDID self-checking and updating method and TV core plate |
| CN203746399U (en) * | 2014-02-11 | 2014-07-30 | 钛积光电(厦门)有限公司 | Auxiliary gauge used for reading display EDID data |
| CN106155942A (en) * | 2015-03-27 | 2016-11-23 | 漳州灿坤实业有限公司 | Power-fail memory function device and system thereof |
-
2016
- 2016-12-29 CN CN201611246646.3A patent/CN106791543A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1773447A (en) * | 2004-10-18 | 2006-05-17 | 创世纪微芯片公司 | Virtual extended display information data (EDID) in a flat panel controller |
| CN1917032A (en) * | 2005-08-18 | 2007-02-21 | 明基电通股份有限公司 | Display screen, and method for reading and writing extension of displaying identified data |
| CN101883204A (en) * | 2009-05-05 | 2010-11-10 | 康佳集团股份有限公司 | TV EDID self-checking and updating method and TV core plate |
| CN203746399U (en) * | 2014-02-11 | 2014-07-30 | 钛积光电(厦门)有限公司 | Auxiliary gauge used for reading display EDID data |
| CN106155942A (en) * | 2015-03-27 | 2016-11-23 | 漳州灿坤实业有限公司 | Power-fail memory function device and system thereof |
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| 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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170531 |