LVDS signal open-circuit and short-circuit detection device and open-circuit and short-circuit detection method

Abstract

The invention discloses an LVDS signal open-circuit and short-circuit detection device. According to the LVDS signal open-circuit and short-circuit detection device, an LVDS signal output end of a graph signal generator is connected with a signal input end of an LVDS driving module through an LVDS bus; a signal output end of the LVDS driving module is connected with a signal input end of a voltage backward flowing-prevention module through an LVDS bus; a signal output end of the voltage backward flowing-prevention is connected with a signal input end of a liquid crystal module set through an LVDS bus; a sampling signal input end of an analog-to-digital conversion module is connected into the LVDS bus connected with the signal input end of the voltage backward flowing-prevention module through a sampling-used LVDS bus; an IIC signal communication end of the graph signal generator is connected with one communication end of an IIC driving module; and the other communication end of the IIC driving module is connected with a sampling control end of the analog-to-digital conversion module. The LVDS signal open-circuit and short-circuit detection device of the invention can simultaneously perform graph display test, LVDS bus short-circuit test and LVDS bus open-circuit test.

Description

technical field [0001] The invention relates to the technical field of LVDS signal detection, in particular to an LVDS signal open-short circuit detection device and an open-short circuit detection method. Background technique [0002] LVDS (Low-Voltage Differential Signaling, low-voltage differential signaling) is a low-voltage swing differential signal transmission technology, which can realize high-speed, low-noise, long-distance, and high-accuracy transmission of data. At present, most of the LCD modules used in TVs and monitors on the market use LVDS interfaces. [0003] Before leaving the factory, the liquid crystal module must undergo graphic display testing to eliminate display defects (that is, the imaging of a liquid crystal display is a pixel arranged in rows and columns, and there may be defects that dots and lines do not emit light), and the graphic signal needs to be confirmed before testing. Whether the LVDS physical interface between the generator and the li...

AI Technical Summary

Problems solved by technology

At present, the detection of the physical connection of the LVDS channel is generally sent by the FPGA (Field-Programmable Gate Array, Field Programmable Gate Array) in the graphic signal generator directly to the P terminal (+) of the LVDS differential pair, and then at the N terminal (-) reception, using relays to switch between graphic display detection and open-short circuit detection, this detection scheme has the following disadvantages: 1) It can only judge open circuit, but not short circuit; 2) It cannot perform graphic display detection and open short circuit detection at the same time ; 3) Because the relay occupies a large area, it is not conducive to PCB layout

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