CN204613805U - An automatic compensation device for the output voltage of a DC power supply of a liquid crystal module - Google Patents

Abstract

The utility model relates to a kind of liquid crystal module DC power output voltage autocompensation installation, the power configuration signal output part of its liquid crystal module direct supply configuration module connects the signal input part of liquid crystal module direct-current power output module, the voltage signal sampling end of voltage sample module connects the voltage signal sampling end of liquid crystal module direct-current power output module, the signal output part of voltage sample module connects the voltage sampling signal input end of single-chip microcomputer, the signal output part of standard voltage value setting module connects the standard voltage signal input end of single-chip microcomputer, the Voltage Feedback calibrating signal output terminal of single-chip microcomputer connects the Voltage Feedback calibrating signal input end of liquid crystal module direct supply configuration module.When the utility model is by making liquid crystal module to carry out some screen test, real-Time Compensation can be carried out to liquid crystal module power supply, ensureing that liquid crystal module power supply under any circumstance all remains on setting value.

Description

An automatic compensation device for the output voltage of a DC power supply of a liquid crystal module

technical field

The utility model relates to the technical field of liquid crystal module power supplies, in particular to an automatic compensation device for the output voltage of a liquid crystal module DC power supply.

Background technique

When LCM (Liquid Crystal Display Module, Liquid Crystal Module) or OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode, Organic Light-Emitting Diode Module) is used for point-screen testing on test equipment, due to the difference in color and brightness of each picture, it is necessary to switch pictures. And when the load changes, the system power supply VDD, backlight power supply VBL, and digital IC power supply VDDIO will change according to the color and brightness of different pictures. However, some LCD modules are more sensitive to the voltage of various power supplies. If there is a deviation from the power supply required by the actual module, it will cause phenomena such as flickering, water ripples, and irregular pictures, which will mislead the staff on the production line and cannot It is very accurate to judge the quality of the liquid crystal module, which affects the detection efficiency of the liquid crystal module.

Utility model content

The purpose of this utility model is to provide an automatic compensation device for the output voltage of the DC power supply of the liquid crystal module. remain at the set value.

In order to solve the above technical problems, the utility model discloses an automatic compensation device for the output voltage of the liquid crystal module DC power supply, which includes a liquid crystal module DC power supply configuration module, a liquid crystal module DC power supply output module, a voltage sampling module, a standard voltage value setting module fixed module and single-chip microcomputer, wherein, the power supply configuration signal output end of the liquid crystal module DC power configuration module is connected to the signal input end of the liquid crystal module DC power output module, and the voltage signal sampling end of the voltage sampling module is connected to the liquid crystal module DC power output The voltage signal sampling end of the module, the signal output end of the voltage sampling module is connected to the voltage sampling signal input end of the single-chip microcomputer, the signal output end of the standard voltage value setting module is connected to the standard voltage signal input end of the single-chip microcomputer, and the voltage feedback calibration signal of the single-chip microcomputer The output end is connected to the voltage feedback calibration signal input end of the DC power configuration module of the liquid crystal module.

The utility model is provided with the above-mentioned liquid crystal module DC power supply configuration module, liquid crystal module DC power output module, voltage sampling module, standard voltage value setting module and single-chip microcomputer, so that when the liquid crystal module performs point-screen testing, the liquid crystal module can be The power supply is compensated in real time to ensure that the power supply of the LCD module remains at the set value under any circumstances, avoiding phenomena such as flickering screens, water ripples, and abnormal pictures of the LCD module caused by fluctuations in power supply voltage. The utility model can eliminate the problem of inaccurate detection results of the liquid crystal module caused by unstable power supply voltage during detection of the liquid crystal module, and improves the detection efficiency of the liquid crystal module.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Among them, 1—LCD module DC power configuration module, 2—LCD module DC power output module, 3—voltage sampling module, 4—standard voltage value setting module, 5—single chip microcomputer, 6—digital-to-analog converter.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

The automatic compensation device for the output voltage of the liquid crystal module DC power supply of the utility model is characterized in that it includes a liquid crystal module DC power supply configuration module 1, a liquid crystal module DC power supply output module 2, a voltage sampling module 3, and a standard voltage value setting module 4 and the single-chip microcomputer 5, wherein, the power configuration signal output end of the liquid crystal module DC power configuration module 1 is connected to the signal input end of the liquid crystal module DC power output module 2, and the voltage signal sampling end of the voltage sampling module 3 is connected to the liquid crystal module The voltage signal sampling end of the DC power supply output module 2, the signal output end of the voltage sampling module 3 is connected to the voltage sampling signal input end of the single-chip microcomputer 5, and the signal output end of the standard voltage value setting module 4 is connected to the standard voltage signal input end of the single-chip microcomputer 5, The output terminal of the voltage feedback calibration signal of the single-chip microcomputer 5 is connected to the input terminal of the voltage feedback calibration signal of the DC power supply configuration module 1 of the liquid crystal module. The single-chip microcomputer 5 controls the storage of each power supply voltage setting value, the voltage sampling module 3 collects the storage of the power supply voltage value in real time, and compares the set value with the collected value in real time, and finally sends voltage feedback calibration to the liquid crystal module DC power supply configuration module 1 Signal.

In the above technical solution, the voltage sampling module 3 is an instrumentation operational amplifier.

In the above technical solution, the voltage signal sampling terminals of the liquid crystal module DC power supply output module 2 and the voltage sampling module 3 include a liquid crystal module system power signal sampling terminal, a liquid crystal module backlight power supply signal sampling terminal, a liquid crystal module digital integrated circuit Power signal sampling terminal;

The liquid crystal module system power signal sampling end of the voltage sampling module 3 is connected to the liquid crystal module system power signal VDD sampling end of the liquid crystal module DC power output module 2, and the liquid crystal module backlight power signal VBL sampling end of the voltage sampling module 3 is connected to The liquid crystal module backlight power signal sampling terminal of the liquid crystal module DC power output module 2, the liquid crystal module digital integrated circuit power signal VDDIO sampling terminal of the voltage sampling module 3 is connected to the liquid crystal module digital integrated circuit of the liquid crystal module DC power output module 2 Power signal sampling terminal.

In the above technical solution, the liquid crystal module DC power supply configuration module 1 is a liquid crystal module DC/DC (direct current to direct current power supply) direct current power supply configuration module. The DC/DC power supply chip of the DC/DC DC power supply configuration module of the liquid crystal module is mainly used for multiple power generation modules to generate different types of liquid crystal module power outputs that can be independently adjusted. The DC/DC conversion is to convert the original DC power by adjusting its PWM (duty cycle) to control the effective voltage of the output;

In the above technical solution, it also includes a digital-to-analog converter 6, and the output terminal of the voltage feedback calibration signal of the single-chip microcomputer 5 is connected to the input terminal of the voltage feedback calibration signal of the DC/DC DC power supply configuration module of the liquid crystal module through the digital-to-analog converter 6 .

The working process of the utility model is: liquid crystal module DC power configuration module 1 controls the liquid crystal module DC power output module 2 to output power signals to the liquid crystal module, and the voltage sampling module 3 collects at the adopting port of the liquid crystal module DC power output module 2 Real-time voltage signal (liquid crystal module system power supply signal, liquid crystal module backlight power supply signal, liquid crystal module digital integrated circuit power supply signal), and transmit it to the single-chip microcomputer 5, the standard voltage value setting module 4 will preset the liquid crystal module Group voltage (liquid crystal module system power supply signal, liquid crystal module backlight power supply signal, liquid crystal module digital integrated circuit power supply signal) standard value is transmitted to single-chip microcomputer 5, and single-chip microcomputer 5 compares the set value with the collection value in real time, and finally sends liquid crystal module The DC power configuration module 1 of the group transmits a voltage feedback calibration signal, and the DC power configuration module 1 of the liquid crystal module controls the DC power output module 2 of the liquid crystal module to output a standard voltage value.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (4)

1. a liquid crystal module DC power output voltage autocompensation installation, it is characterized in that: it comprises liquid crystal module direct supply configuration module (1), liquid crystal module direct-current power output module (2), voltage sample module (3), standard voltage value setting module (4) and single-chip microcomputer (5), wherein, the power configuration signal output part of described liquid crystal module direct supply configuration module (1) connects the signal input part of liquid crystal module direct-current power output module (2), the voltage signal sampling end of voltage sample module (3) connects the voltage signal sampling end of liquid crystal module direct-current power output module (2), the signal output part of voltage sample module (3) connects the voltage sampling signal input end of single-chip microcomputer (5), the signal output part of standard voltage value setting module (4) connects the standard voltage signal input end of single-chip microcomputer (5), the Voltage Feedback calibrating signal output terminal of described single-chip microcomputer (5) connects the Voltage Feedback calibrating signal input end of liquid crystal module direct supply configuration module (1).

2. liquid crystal module DC power output voltage autocompensation installation according to claim 1, is characterized in that: the voltage signal sampling end of described liquid crystal module direct-current power output module (2) and voltage sample module (3) comprises liquid crystal module system power supply signal sampling end, liquid crystal module group backlight power signal sampling end, liquid crystal module digital integrated circuit power signal sampling end;

The liquid crystal module system power supply signal sampling end of described voltage sample module (3) connects the liquid crystal module system power supply signal sampling end of liquid crystal module direct-current power output module (2), the liquid crystal module group backlight power signal sampling end of voltage sample module (3) connects the liquid crystal module group backlight power signal sampling end of liquid crystal module direct-current power output module (2), the liquid crystal module digital integrated circuit power signal sampling end of voltage sample module (3) connects the liquid crystal module digital integrated circuit power signal sampling end of liquid crystal module direct-current power output module (2).

3. liquid crystal module DC power output voltage autocompensation installation according to claim 1, is characterized in that: described liquid crystal module direct supply configuration module (1) is liquid crystal module DC/DC direct supply configuration module.

4. liquid crystal module DC power output voltage autocompensation installation according to claim 3, it is characterized in that: it also comprises digital to analog converter (6), the Voltage Feedback calibrating signal output terminal of described single-chip microcomputer (5) connects the Voltage Feedback calibrating signal input end of liquid crystal module DC/DC direct supply configuration module by digital to analog converter (6).