Detecting method and detecting device of abnormality of differential signal receiving terminal of liquid crystal displaying module

摘要

A detecting method of abnormality of a differential signal receiving terminal of a liquid crystal displaying module, including: inputting high level signals to LVDS0+, LVDS0−, LVDS1+, LVDS− in order, in which only one high level signal is inputted to one of the differential signal lines and the other differential signal lines are kept in high impedance states simultaneously; and receiving feedback signals from all the differential signal lines and determining whether the differential signal lines of detecting units are abnormal or not according to the received feedback signals. The abnormality of the differential signal lines includes terminal resistive opens of the differential signal lines, a short circuit between two adjacent groups of differential signal lines, and short circuits of the differential signal lines to ground or to a power supply caused by abnormal power supplying sequence. By inputting high level signals to the differential signal lines in order and receiving the feedback signal from each differential signal line, the abnormality of the receiving terminal can be detected quickly according to the received feedback signals. This not only reduces the labor cost and time cost, but also improves the detecting efficiency of the abnormality.

主权项

1. A detecting method of abnormality of a differential signal receiving terminal of a liquid crystal displaying module, the receiving terminal comprising a first group of differential signal line having LVDS0+ and LVDS0−, and a second group of differential signal line having LVDS1+ and LVDS1−, the detecting method comprising:
inputting high level signals to LVDS0+, LVDS0−, LVDS1+, LVDS− in order, in which only one high level signal is inputted to one of the differential signal lines each single time and the other differential signal lines are kept in high impedance states simultaneously; and receiving feedback signals from all the differential signal lines and determining whether the differential signal lines of detecting units are abnormal or not according to the received feedback signals, the abnormality of the differential signal lines comprising a terminal resistive open of each group of differential signal line, a short circuit between two groups of the differential signal lines, and a short circuit of each group of differential signal line to ground or to a power supply caused by abnormal power supplying sequence.