CN103345915B - A kind of method of automatic adaptation EDID digital-to-analogue display conversion - Google Patents
A kind of method of automatic adaptation EDID digital-to-analogue display conversion Download PDFInfo
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Abstract
The invention discloses a kind of method of automatic adaptation EDID digital-to-analogue display conversion, belong to the method for Signal aspects conversion, its structure comprises the digital and analogue signals modular converter and control module that are connected to each other, and control module also connects EEPROM; Method step is: control module reads the EDID data of conformable display, carries out the conversion of EDID data, enable host computer read the EDID data of correct digital interface according to the type of digital interface; Control module by conversion after EDID data stored in EEPROM; Control module controls digital-to-analogue signal conversion module and adopts D/A algorithm to carry out the conversion of digital signal to simulating signal.Compared to the prior art the method for a kind of automatic adaptation EDID digital-to-analogue display conversion of the present invention, has stable performance, is suitable for the features such as general.
Description
Technical field
The present invention relates to the method for a kind of Signal aspects conversion, the method for specifically a kind of automatic adaptation EDID digital-to-analogue display conversion.
Background technology
In the special computer such as industry control, national defence field, there is a large amount of double screens and multi-screen simulation (VGA etc.) demand that shows, and main flow display adapter mainly provides the scheme of single analog and multiple digital display, can not meet the needs in this field.Numeral turns simulative display and mainly comprises: 1, the access of display and control number and format conversion; 2, digital signal is to the conversion of simulating signal; 3, the selection of signal conversion method, the control such as enable.
At present, in self-adaptation display conversion, comparatively ripe scheme and method is not also had.The method of realization in the past mainly contains several as follows: 1, fixing display data message, the signal conversion that control D/A comparatively fixes.This method can only be applicable to display partly and numerical monitor is directly changed, and there is the possibility that can not show.2, there is certain adaptive faculty, be fixed the conversion of signal format.This method can only be applicable to the conversion of a kind of interface and a kind of digital signal, can not be applicable to multi-purpose computer as a kind of method.
Summary of the invention
Technical assignment of the present invention is for above weak point, provides a kind of stable performance, is suitable for the method for general a kind of automatic adaptation EDID digital-to-analogue display conversion.
The technical solution adopted for the present invention to solve the technical problems is: comprise the digital and analogue signals modular converter and control module that are connected to each other, control module also connects EEPROM, digital and analogue signals modular converter completes the function that digital signal is converted to simulating signal, and control module completes the function of EDID data conversion and the controlling functions of logarithmic mode signal conversion module; The input end of digital and analogue signals modular converter is digital signal, output terminal is simulating signal, and the input end of control module is digital displaying data, output terminal is simulative display data;
The specific implementation step of described method is:
(1), whether control module detection output terminal insert conformable display, if it is jumps to step (2), if not continuation poll conformable display insert state;
(2), whether control module detection input end insert digital interface, if it is jumps to step (3), if not continuation poll digital interface insert state;
(3), control module reads the EDID data of conformable display, carries out the conversion of EDID data, enable host computer read the EDID data of correct digital interface according to the type of digital interface;
(4), control module by conversion after EDID data stored in EEPROM;
(5), control module control digital-to-analogue signal conversion module adopts D/A algorithm to carry out the conversion of digital signal to simulating signal.
Inner integrated signal input receiver module, channel selecting module and the TTL connected successively of digital and analogue signals modular converter turns VGA module, and signal input receiver module comprises TMDS receiver module, LVDS receiver module, TTL receiver module.
In step (3), the conversion of EDID data comprises following EDID data: EDID version information--and host computer is adopted and on sound lines resolves EDID data, resolution information, level, vertical sync information, refresh rate information, proof test value.
In step (5), digital signal comprises to the conversion of simulating signal:
(1), TMDS signal turns VGA signal, can carry out the conversion of DVI, HDMI digital interface signal;
(2), LVDS signal turns VGA signal, can carry out the conversion of conventional LCD interface signal;
(3), TTL signal turns VGA signal, can carry out the conversion of older LCD interface signal.
EDID, English full name ExtendedDisplayIdentificationData, is translated as extending display identification data.Be a kind of VESA standard data format, wherein comprise the parameter about monitor and performance thereof, comprise supplier information, maximum image size, color is arranged, factory default puts, the restriction of frequency range and the character string of display name and sequence number.
EEPROM, English full name ElectricallyErasableProgrammableRead-OnlyMemory, is translated as EEPROM (Electrically Erasable Programmable Read Only Memo).The storage chip that after a kind of power down, data are not lost.
TMDS--TransitionMinimizedDifferentialsignal, transition minimized differential signaling.
LVDS--Low-VoltageDifferentialSignaling low-voltage differential signal.
TTL--Transistor-TransistorLogic, i.e. transistor-transistor logic integrated circuit, mainly contain BJT(BipolarJunctionTransistor and bipolar junction transistor, transistor) and resistance formation, there is fireballing feature.
VGA--VideoGraphicsArray, Video Graphics Array, uses the computer display standard of simulating signal.
Compared to the prior art the method for a kind of automatic adaptation EDID digital-to-analogue display conversion of the present invention, has reasonable in design, easy to use, stable performance, is suitable for the features such as general, thus, have good value for applications.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Accompanying drawing 1 is a kind of overall practical function logic diagram of method of automatic adaptation EDID digital-to-analogue display conversion;
Accompanying drawing 2 is a kind of digital and analogue signals modular converter internal logic block diagram of method of automatic adaptation EDID digital-to-analogue display conversion.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
The method of a kind of automatic adaptation EDID digital-to-analogue display conversion of the present invention, its structure comprises the digital and analogue signals modular converter and control module that are connected to each other, control module also connects EEPROM, digital and analogue signals modular converter completes the function that digital signal is converted to simulating signal, and control module completes the function of EDID data conversion and the controlling functions of logarithmic mode signal conversion module; The input end of digital and analogue signals modular converter is digital signal, output terminal is simulating signal, and the input end of control module is digital displaying data, output terminal is simulative display data;
The specific implementation step of described method is:
(1), whether control module detection output terminal insert conformable display, if it is jumps to step (2), if not continuation poll conformable display insert state;
(2), whether control module detection input end insert digital interface, if it is jumps to step (3), if not continuation poll digital interface insert state;
(3), control module reads the EDID data of conformable display, carries out the conversion of EDID data, enable host computer read the EDID data of correct digital interface according to the type of digital interface;
(4), control module by conversion after EDID data stored in EEPROM;
(5), control module control digital-to-analogue signal conversion module adopts D/A algorithm to carry out the conversion of digital signal to simulating signal.
Inner integrated signal input receiver module, channel selecting module and the TTL connected successively of digital and analogue signals modular converter turns VGA module, and signal input receiver module comprises TMDS receiver module, LVDS receiver module, TTL receiver module.
In step (3), the conversion of EDID data comprises following EDID data: EDID version information--and host computer is adopted and on sound lines resolves EDID data, resolution information, level, vertical sync information, refresh rate information, proof test value.
In step (5), digital signal comprises to the conversion of simulating signal:
(1), TMDS signal turns VGA signal, can carry out the conversion of DVI, HDMI digital interface signal;
(2), LVDS signal turns VGA signal, can carry out the conversion of conventional LCD interface signal;
(3), TTL signal turns VGA signal, can carry out the conversion of older LCD interface signal.
The method of a kind of automatic adaptation EDID digital-to-analogue display conversion of the present invention, except the technical characteristic described in instructions, is the known technology of those skilled in the art.
Claims (4)
1. one kind adapts to the method for EDID digital-to-analogue display conversion automatically, it is characterized in that be applied to hardware comprises the digital and analogue signals modular converter and control module be connected to each other, control module also connects EEPROM, digital and analogue signals modular converter completes the function that digital signal is converted to simulating signal, and control module completes the function of EDID data conversion and the controlling functions of logarithmic mode signal conversion module; The input end of digital and analogue signals modular converter is digital signal, output terminal is simulating signal, and the input end of control module is digital displaying data, output terminal is simulative display data;
The specific implementation step of described method is:
(1), whether control module detection output terminal insert conformable display, if it is jumps to step (2), if not continuation poll conformable display insert state;
(2), whether control module detection input end insert digital interface, if it is jumps to step (3), if not continuation poll digital interface insert state;
(3), control module reads the EDID data of conformable display, carries out the conversion of EDID data, enable host computer read the EDID data of correct digital interface according to the type of digital interface;
(4), control module by conversion after EDID data stored in EEPROM;
(5), control module control digital-to-analogue signal conversion module adopts D/A algorithm to carry out the conversion of digital signal to simulating signal.
2. the method for a kind of automatic adaptation EDID digital-to-analogue display conversion according to claim 1, it is characterized in that inner integrated signal input receiver module, channel selecting module and the TTL connected successively of digital and analogue signals modular converter turns VGA module, signal input receiver module comprises TMDS receiver module, LVDS receiver module, TTL receiver module.
3. the method for a kind of automatic adaptation EDID digital-to-analogue display conversion according to claim 1, it is characterized in that in step (3), the conversion of EDID data comprises following EDID data: EDID version information, resolution information, level, vertical sync information, refresh rate information, proof test value.
4. the method for a kind of automatic adaptation EDID digital-to-analogue display conversion according to claim 1, is characterized in that in step (5), digital signal comprises to the conversion of simulating signal:
(1), TMDS signal turns VGA signal;
(2), LVDS signal turns VGA signal;
(3), TTL signal turns VGA signal.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592922A (en) * | 2002-09-11 | 2005-03-09 | 索尼株式会社 | Video display |
| CN101079247A (en) * | 2007-06-05 | 2007-11-28 | 东莞黄江达裕科技电子厂 | Display apparatus data updating method and device |
| CN102420966A (en) * | 2011-11-24 | 2012-04-18 | 中兴通讯股份有限公司 | Conference television video output EDID (Extended Display Identification Data) processing method and system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH086683A (en) * | 1994-06-20 | 1996-01-12 | Nec Niigata Ltd | Personal computer |
| US7019791B2 (en) * | 2001-11-09 | 2006-03-28 | Hitachi, Ltd. | Video processing device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592922A (en) * | 2002-09-11 | 2005-03-09 | 索尼株式会社 | Video display |
| CN101079247A (en) * | 2007-06-05 | 2007-11-28 | 东莞黄江达裕科技电子厂 | Display apparatus data updating method and device |
| CN102420966A (en) * | 2011-11-24 | 2012-04-18 | 中兴通讯股份有限公司 | Conference television video output EDID (Extended Display Identification Data) processing method and system |
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