Bias insertion preventing detection circuit having multiple wide FPCs in vehicle-mounted display system and bias insertion preventing detection method

Abstract

A bias insertion preventing detection circuit having multiple wide FPCs in a vehicle-mounted display system includes a vehicle-mounted system mainboard module, a master control chip processing module,a first FPC connector, a second FPC connector and a third FPC connector, wherein the master control chip processing module is integrated to the vehicle-mounted system mainboard module; a pin1 is connected to a pin68 in the first FPC connector; the pin1 of the first FPC connector is connected to a pin1 of the master control chip processing module; a pin1 is connected to a pin68 in the second FPC connector; the pin1 of the second FPC connector is connected to the pin68 of the first FPC connector; a pin1 is connected to a pin68 in the third FPC connector; the pin1 of the third FPC connector is connected to the pin68 of the second FPC connector; and the pin68 of the third FPC connector is connected to a pin2 of the master control chip processing module. The bias insertion preventing detectioncircuit provided by the invention may effectively solve a problem that an automobile instrument and a central control navigation display system have bias insertion easily to cause burn or weak damageof a display screen due to a short circuit of a high-voltage power supply.

Description

technical field [0001] The invention relates to the electrical field, in particular to automotive electronics technology, in particular to an automotive instrument and a central control navigation display system, in particular to an anti-insertion detection circuit and an anti-insertion detection method for a plurality of wide FPCs in an on-vehicle display system. Background technique [0002] The current design of automotive instrumentation and central control navigation display system is as follows: figure 1 (See the process figure 2 ), the screen factory’s FOG TFT-LCD liquid crystal display, FOG pulls out three flexible FPCs from the Driver IC, and connects with the tie1 host system through three pin68 connectors. Since the FOG drive circuit is integrated into the tie1 host system, and the FPC requires There are no electronic components, so the number of pins of each FPC interface will exceed the number of pins of the FPC connector. High voltage pins VGH(20V), VGL(-10V)...

AI Technical Summary

Problems solved by technology

[0002] The current design of automotive instrumentation and central control navigation display system is as follows: figure 1 (See the process figure 2 ), the screen factory’s FOG TFT-LCD liquid crystal display, FOG pulls out three flexible FPCs from the Driver IC, and connects with the tie1 host system through three pin68 connectors. Since the FOG drive circuit is integrated into the tie1 host system, and the FPC requires There are no electronic components, so the number of pins of each FPC interface will exceed the number of pins of the FPC connector. High voltage pins VGH(20V), VGL(-10V), VOTP(8V), VSP(6V), VSN(-6V ), VGMPH(5.6V), VDD(3.3V), Vcom(-1.5V), GND(0V) and other power pins cannot be separated by adding 20pin NC to prevent plug-in short-circuit, a display system from manufacturing test From assembly to assembly, there are at least 5 channels of contact lighting detection, and there may be 5 channels * 3 = 15 risks of mis-insertion, resulting in burns or weak damage to the display screen and tie1 host system due to short-circuit of the high-voltage power supply

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