Patent ID: 9599678
Date: 2017-03-21
CPC Classifications: G01R,G09G,H05B

Claim:
1. A testing circuit for a backlight source, comprising: a power module; a first ON/OFF module; a second ON/OFF module, the power module, the first ON/OFF module, and the second ON/OFF module being connected in series; a control module electrically connected to the first ON/OFF module and the second ON/OFF module; and a parallel branch connected in parallel with the second ON/OFF module, wherein the backlight source is connected in the parallel branch; wherein the control module is configured to control the first ON/OFF module to be switched to an ON state from an OFF state when the control module receives a control signal; and control the second ON/OFF module to be switched to an OFF state from an ON state after a predetermined time delay; wherein the power module comprises a voltage output unit and a constant voltage unit electrically connected with the voltage output unit; wherein the first ON/OFF module comprises an electromagnetic relay, and the second ON/OFF module comprises a time delay relay; wherein the electromagnetic relay comprises a first contact, a second contact, a third contact corresponding to the first contact, and a fourth contact corresponding to the second contact; wherein the first contact of the electromagnetic relay is electrically connected to a positive electrode of the constant voltage unit, the second contact of the electromagnetic relay is electrically connected to a negative electrode of the constant voltage unit, the third contact of the electromagnetic relay is electrically connected to a first contact of the time delay relay, and the fourth contact of the electromagnetic relay is electrically connected to a second contact of the time delay relay; and wherein the first contact of the time delay relay is electrically connected to one terminal of the backlight source, and the second contact of the time delay relay is electrically connected to the other terminal of the backlight source.