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Backlight isolation drive circuit and communication module of lcm test fixture

A technology of backlight isolation and test fixtures, which is applied in the field of communication modules and LED backlight isolation drive circuits. It can solve the problems of high output voltage of backlight, complex design of backlight circuit, and insufficient compatibility, so as to ensure product yield. , not easy to make mistakes, and the effect of simplifying the circuit design

Active Publication Date: 2017-08-25
四川省华景光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of design: ① To distinguish between parallel connection and series connection, it is troublesome for the employees on the production line to operate; ② The parallel drive circuit has a common anode and a common cathode. If only one type is designed on the test board, it may be encountered in production. Trouble, the compatibility is not strong enough, if both are designed, the design of the backlight circuit will be very complicated; ③In the actual test of the series drive circuit, if it encounters an open circuit state, the backlight output voltage will rise very high, and in some cases it may be damage test circuit

Method used

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  • Backlight isolation drive circuit and communication module of lcm test fixture
  • Backlight isolation drive circuit and communication module of lcm test fixture
  • Backlight isolation drive circuit and communication module of lcm test fixture

Examples

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Effect test

example 1

[0135] Example 1: Set the current user command: first send 0xFB--> then send 0x02--> then send 0x03, the system will ignore the last 0x03;

example 2

[0136] Example 2: Read the current user command parameters: first send 0xFD --> read the first byte --> read the second byte, the system only outputs the current user command parameters when reading each byte, On reading the second byte output is undefined.

[0137] 3) When setting the current user command or the parameters of the user command, if the corresponding system command is not sent first, the system ignores the current input.

[0138] Example: After power-on, assign a value of 0x55 to the user command (0x02). First send 0x02 --> then send 0x55; the system ignores the current input.

[0139] From the above content, if you need to write any register of the pin configuration register, output voltage control register and output current control register, first send the FB command to make the communication module enter the write command state, and then send the corresponding The user command can be selected; then it is sent to the FA command, and the parameters are sent ...

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Abstract

The invention provides a backlight isolation drive circuit of an LCM test fixture and a communication module of the circuit. The drive circuit includes a control unit, a voltage adjustment unit, and a voltage polarity conversion unit, the voltage adjustment unit is connected to the control unit, the signal input side of the voltage polarity conversion unit is connected to the voltage adjustment unit and the control unit, and the signal output side is connected to the LED backlight to be tested; The control unit outputs corresponding control signals to the voltage adjustment unit and the voltage polarity conversion unit based on the received external signal. The driving circuit can realize the sharing of LED backlights in series and parallel, common cathode and common anode, and can automatically adjust the output voltage. Among them, the communication module includes a shift register, a shift counter, an instruction decoding unit, an instruction / parameter selection unit, and three user registers for writing / reading. The communication module realizes the synchronous communication between the drive circuit and the external two-wire system , and less internal components, the communication protocol is much simplified compared to the traditional IIC communication protocol.

Description

technical field [0001] The invention relates to the technical field of LCM testing, in particular to an LED backlight isolation driving circuit of an LCM testing fixture, and a communication module for establishing communication between the driving circuit and the outside. Background technique [0002] LCM is an LCD display module, which refers to a component that assembles liquid crystal display devices, connectors, control and drive peripheral circuits, PCB circuit boards, backlight sources, and structural parts. Among them, the backlight is usually an LED backlight, and the LED backlight circuit has diversity. The common anode LED circuit and the common cathode LED circuit are commonly used; there are series LED circuits and parallel LED circuits; there are also series and parallel LED circuits; there is a string There are also multiple strings, two LEDs in parallel, and multiple LEDs in parallel. The drive voltages at both ends of these LED backlight circuits are also d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00H05B47/10
CPCH05B45/50H05B45/44H05B45/00
Inventor 舒继峰
Owner 四川省华景光电科技有限公司
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