CN103280206B - A kind of vehicle-mounted LVDS link monitoring method - Google Patents
A kind of vehicle-mounted LVDS link monitoring method Download PDFInfo
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- CN103280206B CN103280206B CN201310152038.6A CN201310152038A CN103280206B CN 103280206 B CN103280206 B CN 103280206B CN 201310152038 A CN201310152038 A CN 201310152038A CN 103280206 B CN103280206 B CN 103280206B
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Abstract
The present invention relates to a kind of vehicle-mounted LVDS link monitoring method.Described method produces a low-frequency pulse by processor, replaces a data bit in digital RGB video signal parallel interface, be modulated in LVDS link and send together with vision signal; Realize monitoring when isolating this pulse signal after far-end LVDS chip decoded video signal and exporting an intelligent device, if intelligent device does not receive this pulse signal in setting-up time, then notification processor, does corresponding process by processor.The present invention can the abnormal conditions of effective monitoring in-vehicle display system, allow the working condition of on-vehicle host Real-Time Monitoring LVDS link, avoiding because LVDS link is hung dead by occurring after external interference extremely, being separated screen or rear pillow shields the problem that cannot normally show.
Description
Technical field
The present invention relates to car-mounted display technical field, be specifically related to a kind of vehicle-mounted LVDS link monitoring method.
Background technology
In board separation screen products, as entertainment systems is separated display screen, pillow screen after rear seat entertainment system, general adopts LVDS(Low Voltage Differential Signal) technology carrys out transmission video signal.This technology adopts special LVDS chip digital RGB video signal to be modulated into a high-speeld code-flow, and by a pair differential pair transmission to far-end, the LVDS chip solution re-using pairing recalls digital RGB video signal and delivers to display screen display.Because the electric circumstance of automobile is relatively more severe, electromagnetic interference (EMI) and power pulse may make LVDS link occur abnormal and hang dead.And some LVDS chip does not provide diagnose interface, make system cannot learn the state of LVDS link, even if LVDS link occurs that abnormal extension extremely also cannot obtain processing, recovering.
Summary of the invention
For overcoming the problems referred to above, the present invention proposes a kind of vehicle-mounted LVDS link monitoring method.
The technical solution used in the present invention is: a kind of vehicle-mounted LVDS link monitoring method, and the method produces a pulse signal by processor, replaces a data bit in digital RGB video signal parallel interface, is modulated in LVDS link and sends together with vision signal;
Far-end LVDS chip decoded video signal is isolated this pulse signal and exports;
Arrange one for receiving the intelligent device of this separation afterpulse signal, if intelligent device does not receive this pulse signal in setting-up time, then notification processor, does corresponding process by processor.
Preferably, the data bit in described parallel interface chooses the lowest order of redness or blue data.
Concrete, described intelligent device is processor, and isolated pulse signal transmission returns processor, is directly monitored by processor; Or described intelligent device is single-chip microcomputer, described single-chip microcomputer and processor communication, the steering order of receiving processor, controls each module of display screen.
The present invention can the abnormal conditions of effective monitoring in-vehicle display system, allow the working condition of on-vehicle host Real-Time Monitoring LVDS link, avoiding because LVDS link is hung dead by occurring after external interference extremely, being separated screen or rear pillow shields the problem that cannot normally show.
Accompanying drawing explanation
Fig. 1 is hardware implementation block diagram of the present invention.
Embodiment
Understand technology contents of the present invention for convenience of those skilled in the art, below in conjunction with drawings and Examples, the present invention is described in further detail.
As Fig. 1, in-vehicle display system processor generally comprises navigation processing unit and Graphics Processing Unit, and LVDS sends chip and is connected with it, and information processing to be shown is become digital RGB signal by processor, passes to LVDS send chip by bus.In the present invention, processor produces a low frequency pulse signal simultaneously, this signal takies the lower data position (selecting the minimum data position B0 of blue signal in the present embodiment) in rgb signal, be transferred to LVDS and send chip, LVDS transmission chip will receive signal and modulates together and send far-end LVDS receiving chip.
After far-end LVDS receiving chip receives signal, to its decoding, the effective digital RGB signal decoded is exported to display screen display, the low frequency pulse signal that decoded back goes out then exports to separately the intelligent devices such as such as single-chip microcomputer, for monitoring.
If single-chip microcomputer does not receive this pulse signal in setting-up time, possible LVDS link occurs abnormal, then single-chip microcomputer signals to the abnormality of processor notification processor LVDS link, does corresponding process by processor.Generally, the processor LVDS that can reset sends and receiving chip, and still cannot recover if resetted several times continuously, system can be arranged restarts.
In actual applications, be separated display screen and can support touch controllable function, need arrange after single-chip microcomputer processes touch data and be transferred to main frame again, the steering order of Receiving Host is also responsible for by single-chip microcomputer in addition, the each module of display screen is controlled, as brightness adjustment, power management etc.In the method for the invention, this single-chip microcomputer can be utilized as intelligent device, low frequency pulse signal is monitored.If do not need to process these signals, isolated pulse signal directly can take back processor, is monitored by processor itself, does not just need to arrange single-chip microcomputer.When not considering cost, it is also feasible for arranging separately a single-chip microcomputer for receiving this pulse signal.
Described pulse signal selects low frequency pulse signal namely can meet detection requirement and occupying system resources is little, and low frequency pulse signal can be efficiently transmitted over a channel in LVDS high-speed channel simultaneously, good stability.
In addition, the lowest order that pulse signal takies the insensitive redness of human eye or blueness as far as possible transmits, and as B0 or R0, at utmost can reduce the impact on video signal quality.
Above-described embodiment is only specific implementation of the present invention, and it describes comparatively concrete and detailed, therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these apparent replacement forms all belong to protection scope of the present invention.
Claims (3)
1. vehicle-mounted LVDS link monitoring method, is characterized in that,
Produce a pulse signal by processor, replace the redness of data bit in digital RGB video signal parallel interface or the lowest order of blue data, be modulated to together with vision signal in LVDS link and send;
Far-end LVDS chip decoded video signal is isolated this pulse signal and exports;
Arrange one for receiving the intelligent device of this separation afterpulse signal, if intelligent device does not receive this pulse signal in setting-up time, then notification processor, does corresponding process by processor;
Described intelligent device is processor, and isolated pulse signal transmission returns processor, is directly monitored by processor; Or described intelligent device is single-chip microcomputer, described single-chip microcomputer and processor communication, the steering order of receiving processor, controls each module of display screen;
Described intelligent device and processor adopt serial data bus communication.
2. vehicle-mounted LVDS link monitoring method according to claim 1, is characterized in that: described setting-up time is 2-3 second.
3. vehicle-mounted LVDS link monitoring method according to claim 1, is characterized in that: described pulse signal adopts low frequency pulse signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310152038.6A CN103280206B (en) | 2013-04-27 | 2013-04-27 | A kind of vehicle-mounted LVDS link monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310152038.6A CN103280206B (en) | 2013-04-27 | 2013-04-27 | A kind of vehicle-mounted LVDS link monitoring method |
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| CN103280206A CN103280206A (en) | 2013-09-04 |
| CN103280206B true CN103280206B (en) | 2015-10-14 |
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| CN201310152038.6A Active CN103280206B (en) | 2013-04-27 | 2013-04-27 | A kind of vehicle-mounted LVDS link monitoring method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104268116A (en) * | 2014-09-24 | 2015-01-07 | 重庆长安汽车股份有限公司 | Communication mode for vehicle-mounted entertainment host and split type touch screen |
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| US6486695B1 (en) * | 1999-04-14 | 2002-11-26 | Kabushiki Kaisha Toshiba | Protecting unit |
| US6943591B1 (en) * | 2001-08-17 | 2005-09-13 | National Semiconductor Corporation | Apparatus and method for detecting a fault condition in a common-mode signal |
| CN200959622Y (en) * | 2006-07-31 | 2007-10-10 | 华为技术有限公司 | Difference signal transmission line detecting system |
| CN102377991A (en) * | 2010-08-24 | 2012-03-14 | 泰勒斯公司 | System for transmitting and receiving digital video signals for lvds links |
| CN102568418A (en) * | 2011-12-30 | 2012-07-11 | 上海博泰悦臻电子设备制造有限公司 | Vehicle-mounted display system |
| CN202383233U (en) * | 2011-12-29 | 2012-08-15 | 上海博泰悦臻电子设备制造有限公司 | Diagnosis circuit for low-voltage differential signal cable of automobile |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW592366U (en) * | 2003-01-20 | 2004-06-11 | Tatung Co | LVDS signal switching control device of portable device |
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2013
- 2013-04-27 CN CN201310152038.6A patent/CN103280206B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6486695B1 (en) * | 1999-04-14 | 2002-11-26 | Kabushiki Kaisha Toshiba | Protecting unit |
| US6943591B1 (en) * | 2001-08-17 | 2005-09-13 | National Semiconductor Corporation | Apparatus and method for detecting a fault condition in a common-mode signal |
| CN200959622Y (en) * | 2006-07-31 | 2007-10-10 | 华为技术有限公司 | Difference signal transmission line detecting system |
| CN102377991A (en) * | 2010-08-24 | 2012-03-14 | 泰勒斯公司 | System for transmitting and receiving digital video signals for lvds links |
| CN202383233U (en) * | 2011-12-29 | 2012-08-15 | 上海博泰悦臻电子设备制造有限公司 | Diagnosis circuit for low-voltage differential signal cable of automobile |
| CN102568418A (en) * | 2011-12-30 | 2012-07-11 | 上海博泰悦臻电子设备制造有限公司 | Vehicle-mounted display system |
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Address after: 516006 Guangdong city of Huizhou province and Zhongkai hi tech Industrial Development Zone Five West Road No. 103 Applicant after: HUIZHOU DESAY SV AUTOMOTIVE CO., LTD. Address before: 516006 Guangdong city of Huizhou province and Zhongkai hi tech Industrial Development Zone Five West Road No. 103 Applicant before: Huizhou Desay SV Auto. Electronics Co., Ltd. |
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