Method for monitoring vehicle-mounted LVDS (Low Voltage Differential Signaling) link

A link and processor technology, applied in the direction of cathode ray tube indicators, instruments, static indicators, etc., can solve the problems of hanging, unable to be processed and restored, unable to know the status of LVDS link, etc., to avoid abnormal hanging dead effect

Active Publication Date: 2013-09-04
HUIZHOU DESAY SV AUTOMOTIVE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the harsh electrical environment of the car, electromagnetic interference and power pulses may cause abnormalities in the LVDS link and hang up
However, some LVDS chips do not provide a diagnostic interface, so that the system cannot know the status of the LVDS link. Even if the LVDS link fails abnormally, it cannot be processed and recovered.

Method used

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  • Method for monitoring vehicle-mounted LVDS (Low Voltage Differential Signaling) link

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Embodiment Construction

[0011] In order to facilitate those skilled in the art to understand the technical content of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0012] Such as figure 1 The vehicle display system processor generally includes a navigation processing unit and a graphics processing unit, and the LVDS sending chip is connected to it. The processor processes the information to be displayed into a digital RGB signal and transmits it to the LVDS sending chip through the bus. In the present invention, the processor simultaneously generates a low-frequency pulse signal, which occupies a lower data bit in the RGB signal (the lowest data bit B0 of the blue signal is selected in this embodiment), and is transmitted to the LVDS sending chip, and the LVDS sending chip will The received signal is modulated together and sent to the remote LVDS receiving chip.

[0013] After the remote LVDS re...

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Abstract

The invention relates to a method for monitoring vehicle-mounted LVDS (Low Voltage Differential Signaling) link. The method comprises the steps that a processor generates a low frequency pulse signal, the low frequency pulse signal replaces a data bit in a digital RGB (Red Green Blue) video signal parallel interface, and then the low frequency pulse signal is modulated into the LVDS link together with a video signal for transmission; and when a far-end LVDS chip separates the pulse signal and outputs an intelligent device to realize monitoring after decoding the video signal, the intelligent device informs the processor to implement corresponding treatment in the event of not receiving the pulse signal within specified time. By the adoption of the method for monitoring the vehicle-mounted LVDS link, the abnormalities of a vehicle-mounted display system can be effectively monitored; a vehicle-mounted host is enabled to monitor the working status of the LVDS link in real time; and therefore, the problem that as the LVDS link is abnormally suspended after suffering external interference, a separation screen or a rear headrest screen cannot display normally is solved.

Description

technical field [0001] The invention relates to the field of vehicle display technology, in particular to a method for monitoring a vehicle LVDS link. Background technique [0002] In the car split screen products, such as the split screen of the entertainment system and the rear pillow screen of the rear seat entertainment system, LVDS (low voltage differential signal) technology is generally used to transmit video signals. This technology uses a dedicated LVDS chip to modulate the digital RGB video signal into a high-speed code stream, transmits it to the remote end through a pair of differential pairs, and then uses the paired LVDS chip to demodulate the digital RGB video signal and send it to the display screen for display. Because the electrical environment of the car is relatively harsh, electromagnetic interference and power pulses may cause abnormalities in the LVDS link and hang up. However, some LVDS chips do not provide a diagnostic interface, so that the system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G5/00
Inventor 罗耿欢
Owner HUIZHOU DESAY SV AUTOMOTIVE
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