Method for detecting faults of reverse protection circuit on flexible printed circuit
A flexible circuit board, reverse protection technology, applied in the direction of electronic circuit testing, measuring electricity, measuring devices, etc., can solve problems such as affecting production efficiency, long time, and adverse enterprise cost control.
Active Publication Date: 2012-07-04
深圳市合力泰光电有限公司
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Problems solved by technology
[0005] 1. Visual inspection can only check the very serious situation of diode falling off or tin cracking (cracking of diode and FPC solder);
[0006] 2. In order to detect more tin-cracked products and eliminate hidden dangers, we can only use a high-power magnifying glass to check, and it takes a long time to use a high-power magnifying glass to check a reverse protection circuit, which will seriously affect production efficiency during mass production;
[0007] 3. The cost of high-power magnifiers is high. To perform microscopic inspection on all FPCs, it is necessary to purchase a large number of high-power magnifiers, which is not conducive to enterprise cost control
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[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0021] In the embodiment of the present invention, the delay of some related instructions when the Driver IC is initialized is shortened, so that the Driver IC
[0022] The boost condition of the circuit first connected to the reverse protection circuit in the IC becomes more stringent, so that the driver IC enters the locked state when the reverse protection circuit on the FPC fails, and then depends on whether the driver IC has a large current To judge whether the reverse protection circuit on the FPC is faulty.
[0023] figure 1 It is the circuit part inside the Driver IC related to the revers...
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The invention is applicable to the field of liquid crystal display production, and provides a method for detecting the faults of a reverse protection circuit on a flexible printed circuit. The method includes the following steps that: a Driver IC quits a sleeping mode, and the delay time does not exceeds 10ms; a crystal oscillator in the Driver IC is started, and the delay time does not exceeds 10ms; the Driver IC is boosted for the first stage, and the delay time does not exceeds 7ms; the Driver IC is boosted for the second stage, and the delay time does not exceeds 7ms; the Driver IC is boosted for the third stage, and the delay time does not exceeds 5ms; whether an LCM to be tested does not display and has large current or not is tested, and if yes, the reverse protection circuit on the FPC goes wrong. Since the invention shortens the delays of related instructions when the Driver IC is initialized, the Driver IC can enter a locked state when the reverse protection circuit on the FPC goes wrong, and thereby whether the reverse protection circuit on the FPC goes wrong or not can be judged according to whether the Driver IC has large current or not.
Description
technical field [0001] The invention belongs to the field of liquid crystal display manufacture, and in particular relates to a fault detection method for a reverse protection circuit on a flexible circuit board. Background technique [0002] Liquid Crystal Module (LCM) is composed of LCD Panel, Driver IC, Flexible Printed Circuit (FPC), backlight, etc., where FPC is used to carry Driver IC For the general Driver IC, the circuits that need to be carried on the FPC include a voltage doubler circuit, a voltage regulator circuit, a crystal oscillator circuit, a reverse protection circuit, etc. If there is a problem with these circuits on the FPC (such as components falling off or soldering Poor connection, etc.), will have varying degrees of impact on the work of the LCM. In order to ensure that the LCM works normally on the client side, the display function test will be done before the LCM leaves the factory, that is, to simulate the client side such as communication terminal...
Claims
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IPC IPC(8): G01R31/28G01R31/02G02F1/13
Inventor 张春燕
Owner 深圳市合力泰光电有限公司