CN111781486A - LCM automatic electric performance detection alarm system - Google Patents

LCM automatic electric performance detection alarm system Download PDF

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Publication number
CN111781486A
CN111781486A CN202010690498.4A CN202010690498A CN111781486A CN 111781486 A CN111781486 A CN 111781486A CN 202010690498 A CN202010690498 A CN 202010690498A CN 111781486 A CN111781486 A CN 111781486A
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CN
China
Prior art keywords
circuit
lcm
current
mcu control
control circuit
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Withdrawn
Application number
CN202010690498.4A
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Chinese (zh)
Inventor
莫辉雄
周芳青
李云海
仇泽军
陈诚
陈义
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Dongguan Depute Electronics Co ltd
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Dongguan Depute Electronics Co ltd
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Priority to CN202010690498.4A priority Critical patent/CN111781486A/en
Publication of CN111781486A publication Critical patent/CN111781486A/en
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/26—Testing of individual semiconductor devices
    • G01R31/2607—Circuits therefor
    • G01R31/2632—Circuits therefor for testing diodes
    • G01R31/2635—Testing light-emitting diodes, laser diodes or photodiodes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The invention discloses an LCM automatic electric performance detection alarm system, which comprises an MCU control circuit, wherein the MCU control circuit receives current and voltage values acquired by a current and voltage sampling circuit, the MCU control circuit outputs the processed current and voltage values to an LCM electric performance data display circuit for display, the MCU control circuit outputs data processing results to the alarm circuit, the MCU control circuit, the current and voltage sampling circuit, the alarm circuit and the LCM electric performance data display circuit are powered by a power supply circuit, the current and voltage sampling circuit receives an LCM power line provided by a jig interface circuit, the LCM power line passes through the current and voltage sampling circuit and then is output to an LCM interface circuit to be detected, an LCM signal line output by the jig interface circuit is connected with the LCM interface circuit to be detected, the invention has convenient measurement and high efficiency, the current and voltage values of the LCM to be detected can be directly displayed, unqualified LCM can be alarmed, and interference to the test is reduced.

Description

LCM automatic electric performance detection alarm system
Technical Field
The invention relates to the technical field of liquid crystal display module detection, in particular to an LCM automatic electrical property detection alarm system.
Background
LCM (LCD module), namely LCD display module and liquid crystal module, refers to a component which assembles peripheral circuits such as a liquid crystal display device, a connecting piece, a control and drive device, a PCB circuit board, a backlight source, a structural part and the like.
The electric measuring tool used by the liquid crystal display module is not designed with a voltage and current detecting module, so that the liquid crystal display module can be simply lightened, but whether the electric parameters of the liquid crystal display module are in the range or not can not be confirmed.
The current method for testing the LCM electrical performance parameters is as follows: the universal meters are connected in series or in parallel on the LCM signal line, numerical values displayed on the universal meters are read and recorded, and then workers compare the numerical values with standard numerical values one by one to judge whether the electrical property meets the specification.
The test method has the following disadvantages: firstly, only partial electrical property data can be tested at one time, labor is consumed, and efficiency is extremely low; secondly, whether the data are correct or not needs to be manually compared one by one, so that eyes are easily injured, the influence of human factors is large, defective products are easily omitted, and the test result is influenced; thirdly, the method of externally connecting the ammeter is that the power supply circuit can be connected very long, and the product signal is easily interfered and is misjudged as a defective product; finally, the power supply detected by the liquid crystal display module has more than multiple paths, and the operation is complicated and the cost is extremely high if the power supply is connected with an ammeter externally.
Accordingly, the prior art is deficient and needs improvement.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an LCM automatic electrical property detection alarm system which is convenient to measure, high in measurement efficiency, capable of directly displaying the current and voltage values of an LCM to be detected, capable of alarming on unqualified LCMs and capable of reducing interference on testing.
In order to achieve the purpose, the invention provides an LCM automatic electrical property detection alarm system which comprises an MCU control circuit, wherein the MCU control circuit receives current and voltage values acquired by a current and voltage sampling circuit, the MCU control circuit outputs the processed current and voltage values to an LCM electrical property data display circuit for displaying, the MCU control circuit outputs data processing results to the alarm circuit, the MCU control circuit, the current and voltage sampling circuit, the alarm circuit and the LCM electrical property data display circuit are powered by a power supply circuit, the current and voltage sampling circuit receives an LCM power line provided by a jig interface circuit, the LCM power line passes through the current and voltage sampling circuit and then is output to an LCM interface circuit to be detected, and an LCM signal line output by the jig interface circuit is connected with the LCM interface circuit to be detected.
Preferably, the MCU control circuit receives data with the current and voltage sampling circuit through an IIC bus.
Preferably, the MCU control circuit outputs data through the SPI bus and the LCM electrical property data display circuit.
Preferably, an anti-surge circuit is connected to the LCM power line.
Preferably, an anti-static discharge circuit is connected to the LCM signal line.
Preferably, the control chip of the MCU control circuit is C8051F 310.
Preferably, the current and voltage detection chip of the current and voltage sampling circuit is an INA226, the MCU control circuit drives the current and voltage detection chip through an IIC bus, and the current and voltage detection chip inputs the collected current and voltage values into the MCU control circuit through the IIC bus.
Preferably, the alarm circuit comprises a buzzer and an LED lamp.
Preferably, the MCU control circuit is further provided with a program programming port, and the program programming port is a program mme-header device.
Compared with the prior art, the invention has the beneficial effects that:
1. the current and voltage values of the LCM to be detected are detected through the current and voltage sampling circuit, the detected current and voltage values are input into the MCU control circuit through the IIC bus to be subjected to data processing, the MCU control circuit outputs the current and voltage values to the LCM electrical property data display circuit to be displayed after the processing is finished, meanwhile, the MCU control circuit compares the processed current and voltage values with the set current and voltage limit values, if the current and voltage values meet the requirements, the LED lamp in the alarm circuit is turned on, and if the current and voltage values do not meet the requirements, the LED lamp in the alarm circuit is turned on, the red lamp and the buzzer alarm, so that defective products are effectively intercepted.
2. According to the invention, only the LCM to be detected is placed on the LCM interface circuit to be detected, other steps are automatically completed, the result is directly obtained, the measurement is convenient, the detection efficiency is high, the current and the voltage of the LCM to be detected can be directly and visually displayed through the LCM electrical property data display circuit, the error rate is reduced, and the labor intensity of staff is reduced.
3. When the test is carried out, staff only need to check whether the LCM display effect is qualified or not, and do not need to check whether the current and the voltage are normal or not, so that the production efficiency is improved.
4. According to the invention, the anti-surge circuit is connected to the LCM power line, the anti-static discharge circuit is connected to the LCM signal line, and the power supply and the signal protection circuit are added, so that damage to the LCM to be detected due to voltage abnormity and external static electricity in the test process is avoided.
5. The invention has high integration level, reduces the interference to detection due to overlong detection line, avoids misjudgment of normal LCM and saves production cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an LCM automatic electrical performance detection alarm system according to the present invention;
FIG. 2 is a circuit diagram of an MCU control circuit of an LCM automatic electrical property detection alarm system provided by the invention;
FIG. 3 is a first circuit diagram of a current and voltage sampling circuit of an LCM automatic electrical performance detection alarm system provided by the invention;
FIG. 4 is a second circuit diagram of the current and voltage sampling circuit of the LCM automatic electric performance detection alarm system provided by the invention;
FIG. 5 is a third circuit diagram of the current and voltage sampling circuit of an LCM automatic electrical performance detection alarm system provided by the invention;
FIG. 6 is a fourth circuit diagram of the current and voltage sampling circuit of an LCM automatic electrical performance detection alarm system provided by the invention;
FIG. 7 is a fifth circuit diagram of the current and voltage sampling circuit of an LCM automatic electrical performance detection alarm system provided by the invention;
FIG. 8 is a circuit diagram of an alarm circuit of an LCM automatic electrical property detection alarm system provided by the present invention;
FIG. 9 is a circuit diagram of an LCM electrical performance data display circuit of an LCM automatic electrical performance detection alarm system provided by the invention;
FIG. 10 is a circuit diagram of a to-be-detected LCM interface circuit and a to-be-detected LCM interface of the LCM automatic electrical performance detection alarm system provided by the invention;
fig. 11 is a circuit diagram of a power supply circuit of an LCM automatic electrical property detection alarm system provided by the present invention.
The figure includes:
the device comprises a power supply circuit 1, a 2-MCU control circuit, a 3-current and voltage sampling circuit, a 4-alarm circuit, a 5-LCM electrical property data display circuit, a 6-LCM interface circuit to be detected, a 7-jig interface circuit, an 8-anti-surge circuit, a 9-anti-static discharge circuit, an 11-LCM power line, a 12-LCM signal line, a 13-SPI bus and a 14-IIC bus.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are one embodiment of the present invention, and not all embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Referring to fig. 1, the invention provides an LCM automatic electrical property detection alarm system, which includes an MCU control circuit 2, the MCU control circuit 2 orderly controls the normal operation of each circuit according to a set program, the MCU control circuit 2 receives the current and voltage values collected by the current and voltage sampling circuit 3 through an IIC bus 14, the MCU control circuit 2 processes the received current and voltage data, amplifies and converts the received electrical signals into digital signals, the MCU control circuit 2 outputs the processed current and voltage values to an LCM electrical property data display circuit 5 for display, the LCM electrical property data display circuit 5 is provided with a display device for displaying the processed current and voltage values, thereby reducing error rate and labor intensity of staff.
MCU control circuit 2 compares the electric current and the voltage that obtain with the extreme value of the electric current and the voltage that set up, and the maximum value and the minimum of contrast electric current simultaneously contrast the maximum value and the minimum of voltage, MCU control circuit 2 exports alarm circuit 4 with the data processing result through SPI bus 13, alarm circuit 4 includes bee calling organ and LED lamp, if the electric current and the voltage value that wait to detect the LCM meet the requirements, LED lamp bright green lamp among the alarm circuit, if the electric current and the voltage value that wait to detect the LCM do not meet the requirements, LED lamp bright red light in the alarm circuit is bee calling organ simultaneously and is reported to the police, reminds the operator to carry out effective interception defective products, directly reachs the result like this, and it is convenient to measure, and detection efficiency is high.
The MCU control circuit 2, the current and voltage sampling circuit 3, the alarm circuit 4 and the LCM electrical property data display circuit 5 are powered by the power supply circuit 1, the power supply circuit 1 reduces input 12V direct current into 3.3V and 2.8V voltages required by each circuit, the current and voltage sampling circuit 3 receives an LCM power line 11 provided by the jig interface circuit 7, the LCM power line 11 passes through the current and voltage sampling circuit 3 and then is output to the LCM interface circuit 6 to be detected, an LCM signal line 12 output by the jig interface circuit 7 is connected with the LCM interface circuit 6 to be detected, and the whole device is provided with the power supply circuit 1 and the jig interface circuit 7 to provide two paths of power supplies which are not interfered with each other, so that the detection accuracy is improved, the measurement errors and the measurement interference are reduced, the misjudgment is reduced, and the production cost is reduced.
The LCM power line 11 is connected with an anti-surge circuit 8, the LCM signal line 12 is connected with an anti-static discharge circuit 9, and a power supply and a signal protection circuit are added, so that damage to the LCM to be detected due to voltage abnormity and external static electricity in the test process is avoided, measurement errors are reduced, and the measurement accuracy is improved.
The control chip of the MCU control circuit 2 is C8051F310, the MCU control circuit 2 is also provided with a program burning port, the program burning port is a PROGRAMME-HEADE device, the program burning port is provided with a program burning port which can be convenient to modify the program of the control chip, the application range of the system is enlarged, different LCMs to be detected can be detected, the manufacturing cost of the jig is saved, the universality of the jig is improved, meanwhile, the targeted detection of each LCM to be detected is facilitated, the detection precision is higher, and the product quality is improved.
The current and voltage detection chip of the current and voltage sampling circuit 3 is INA226, the MCU control circuit 2 drives the current and voltage detection chip through the IIC bus 14, and the current and voltage detection chip inputs the acquired current and voltage values into the MCU control circuit 2 through the IIC bus 14.
The invention provides an LCM automatic electrical property detection alarm system, which not only can directly display the current and voltage values of an LCM to be detected, but also can set the alarm range value, and prompts testers to detect that the LCM is unqualified through the alarm of a buzzer and the red light of an LED lamp.
The system is arranged in the detection jig, the surface of the jig is provided with a plurality of interfaces, such as a power supply input port, a program downloading port, an indicator light, a buzzer and a display screen, all components of the system are welded on the same PCB, a user only needs to define a connecting line according to the provided interface, an alarm value is set by a program and then is burnt into the system for normal use, when the current and voltage values of the LCM to be detected exceed the set range, the LED light is turned on, the buzzer gives an alarm, and the LCM electrical property data display circuit 5 can display whether the current is abnormal or the voltage is abnormal in real time, so that the unqualified LCM can be quickly and effectively picked out.
Referring to fig. 3 to 7, the fixture interface circuit 7 provides 5 power supplies, which are respectively: LCD _ LEDA, VVC-IN, IOV1.8, AVDD and VSN need independent detection, and the power supply respectively passes through the sampling resistor, and the difference is: r92, R730, R32, R33 and R340 are fed to the LCM interface circuit 6 to be tested, and the sampling chips INA226 are set with different addresses (set by level changes of a1 and a 0), so that only one set of IIC bus 14(SDA, SDL) is needed, and the MCU control circuit 2 can control all the sampling chips.
Referring to fig. 2, fig. 2 is a circuit diagram of the MCU control circuit 2, the MCU control circuit 2 is a C8051F310 chip, and the program programming interface is a program programming interface.
Referring to fig. 8, fig. 8 is a circuit diagram of the alarm circuit 4, when the current and voltage of the LCM to be detected exceed the range, the PIN of the negative electrode of the LED lamp connected to the MCU control circuit 2 will become low level, the LED lamp will light red, and the PIN of the BUZZER will become high level, so that the BUZZER alarms.
Referring to fig. 9, fig. 9 is a pin circuit of the display panel of the LCM electrical data display circuit 5, which is responsible for the display function.
Referring to fig. 10, fig. 10 is a circuit diagram of the LCM interface circuit to be tested 6(J1) and the LCM interface to be tested (J3).
Referring to fig. 11, fig. 11 is a circuit diagram of the power supply circuit 1, an external 12V power supply is converted into 5V by a buck chip LM2596 and then output, and the 5V power supply is stepped down into multiple paths of 3.3V by a low dropout regulator (LDO) and is respectively supplied to different circuits.
In the debugging process of the LCM automatic electrical performance detection alarm system, a user only needs to connect a line according to the provided interface definition, set an alarm value by a program and then burn the alarm value into the system for normal use, and test by using a qualified LCM to obtain qualification, namely successful debugging.
In the using process of the system, firstly, taking out a piece of LCM to be detected and placing the piece of LCM into the LCM interface circuit 6 to be detected; secondly, the current and voltage sampling circuit 3 automatically detects the current and voltage values of the LCM to be detected, and the MCU control circuit 2 processes the acquired current and voltage values; thirdly, the LCM electrical property data display circuit 5 displays the current and voltage values of the LCM to be detected; and finally, when the current and voltage values of the LCM to be detected are qualified, the LED lamp in the alarm circuit 4 is turned on to be green, and when the current and voltage values of the LCM to be detected are unqualified, the LED lamp in the alarm circuit 4 is turned on to be red and the buzzer alarms.
In conclusion, the beneficial effects of the invention are as follows:
1. the current and voltage values of the LCM to be detected are detected through the current and voltage sampling circuit 3, the detected current and voltage values are input into the MCU control circuit 2 through the IIC bus 14 for data processing, the MCU control circuit 2 outputs the processed current and voltage values to the LCM electrical property data display circuit 5 through the SPI bus 13 for display, meanwhile, the MCU control circuit 2 compares the processed current and voltage values with the set limit values of the current and voltage values, if the current and voltage values meet the requirements, the LED lamp in the alarm circuit 4 is turned on, if the current and voltage values do not meet the requirements, the LED lamp in the alarm circuit 4 is turned on, the buzzer alarms, and defective products are effectively intercepted.
2. According to the invention, only the LCM to be detected is placed on the LCM interface circuit 6 to be detected, other steps are automatically completed, the result is directly obtained, the measurement is convenient, the detection efficiency is high, the current and the voltage of the LCM to be detected can be directly and visually displayed through the LCM electrical property data display circuit 5, the error rate is reduced, and the labor intensity of staff is reduced.
3. When the test is carried out, staff only need to check whether the LCM display effect is qualified or not, and do not need to check whether the current and the voltage are normal or not, so that the production efficiency is improved.
4. According to the invention, the anti-surge circuit 8 is connected on the LCM power line 11, the anti-static discharge circuit 9 is connected on the LCM signal line 12, and the power supply and signal protection circuit are added, so that damage to the LCM to be detected due to voltage abnormity and external static electricity in the test process is avoided.
5. The invention has high integration level, reduces the interference to detection due to overlong detection line, avoids misjudgment of normal LCM and saves production cost.

Claims (9)

1. An LCM automatic electric performance detection alarm system is characterized by comprising an MCU control circuit (2), wherein the MCU control circuit (2) receives current and voltage values collected by a current and voltage sampling circuit (3), the MCU control circuit (2) outputs the processed current and voltage values to an LCM electric performance data display circuit (5) for display, the MCU control circuit (2) outputs data processing results to an alarm circuit (4), the MCU control circuit (2), the current and voltage sampling circuit (3), the alarm circuit (4) and the LCM electric performance data display circuit (5) are powered by a power supply circuit (1), the current and voltage sampling circuit (3) receives a power supply line (11) provided by a jig interface circuit (7), and the LCM power line (11) passes through the current and voltage sampling circuit (3) and then is output to an LCM interface circuit (6) to be detected, the LCM signal line (12) output by the jig interface circuit (7) is connected with the LCM interface circuit (6) to be detected.
2. The LCM automatic electric property detection alarm system of claim 1, wherein the MCU control circuit (2) performs data reception with the current and voltage sampling circuit (3) through an IIC bus (14).
3. The LCM automatic electric property detection alarm system of claim 1, wherein the MCU control circuit (2) performs data output with the LCM electric property data display circuit (5) through an SPI bus (13).
4. The LCM automatic electric performance detection alarm system of claim 1, wherein an anti-surge circuit (8) is connected to the LCM power line (11).
5. The LCM automatic electric property detection alarm system of claim 1, wherein an anti-static discharge circuit (9) is connected to the LCM signal line (12).
6. The LCM automatic electric property detection alarm system of claim 1, wherein the control chip of the MCU control circuit (2) is C8051F 310.
7. The LCM automatic electric performance detection alarm system of claim 2, wherein the current and voltage detection chip of the current and voltage sampling circuit (3) is INA226, the MCU control circuit (2) drives the current and voltage detection chip through the IIC bus (14), and the current and voltage detection chip inputs the collected current and voltage values into the MCU control circuit (2) through the IIC bus (14).
8. The LCM automatic electrical property detection alarm system according to claim 1, wherein the alarm circuit (4) comprises a buzzer and an LED lamp.
9. The LCM automatic electrical performance detection alarm system of claim 1, wherein the MCU control circuit (2) is further provided with a program burning port, and the program burning port is a PROGRAMME-HEADE device.
CN202010690498.4A 2020-07-17 2020-07-17 LCM automatic electric performance detection alarm system Withdrawn CN111781486A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010690498.4A CN111781486A (en) 2020-07-17 2020-07-17 LCM automatic electric performance detection alarm system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010690498.4A CN111781486A (en) 2020-07-17 2020-07-17 LCM automatic electric performance detection alarm system

Publications (1)

Publication Number Publication Date
CN111781486A true CN111781486A (en) 2020-10-16

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CN202010690498.4A Withdrawn CN111781486A (en) 2020-07-17 2020-07-17 LCM automatic electric performance detection alarm system

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113393807A (en) * 2021-07-18 2021-09-14 陈惠� Device for preventing LED display screen spontaneous combustion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113393807A (en) * 2021-07-18 2021-09-14 陈惠� Device for preventing LED display screen spontaneous combustion

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Application publication date: 20201016