WO2020233124A1

WO2020233124A1 - Projector optical machine test system and method

Info

Publication number: WO2020233124A1
Application number: PCT/CN2019/129185
Authority: WO
Inventors: 高文刚
Original assignee: 歌尔股份有限公司
Priority date: 2019-05-17
Filing date: 2019-12-27
Publication date: 2020-11-26
Also published as: CN110031186A; CN110031186B

Abstract

A projector optical machine test system and method. The projector optical machine test system comprises: a test terminal (100) configured to output a current control signal during testing; an optical machine test platform (200) configured to place a projector optical machine to be tested, and drive said projector optical machine to operate according to the current control signal; and a data acquisition and burning plate (300) configured to obtain the present brightness value of said projector optical machine as well as current values of red, green and blue LEDs in the projector optical machine under the present brightness, and determine that the current of each LED is set correctly if the present brightness values of the red, green and blue LEDs all match a preset brightness value. The test terminal (100) is further configured to record the current values of the red, green and blue LEDs under the present brightness, and burn same to a memory of said projector optical machine by means of the data acquisition and burning plate (300). The test intelligence of the projector optical machine is improved, no manual operation is required, and the problems of inconvenience to operate by an operator and proneness to a clerical error due to low test intelligence of the projector optical machine are solved.

Description

Projector optical-mechanical testing system and method

Technical field

The invention relates to the technical field of electronic circuits, in particular to a projector optical-mechanical testing system and method.

Background technique

At present, the test method of the projector optical machine is usually the scheme of sampling current probe + oscilloscope + PC + burner. However, this test method needs to manually read the data and make records, import the recorded data to the PC, and then burn to the burner through the PC. It requires manual operation, is intelligent, and is less inconvenient for the operator to make, and it is easy There was a problem with logging errors.

Summary of the invention

The main purpose of the present invention is to provide a projector optical-mechanical test system and method, aiming to improve the intelligence of the projector optical-mechanical test.

In order to achieve the above objective, the present invention provides a projector optical-mechanical test system, which includes:

The test terminal is configured to output current control signals during testing;

The optical machine test platform is configured for placement of the optical machine of the projector under test, and drives the optical machine of the projector under test to work according to the current control signal;

The data acquisition and burning board is configured to obtain the current brightness value of the projector under test and the current value of the red, green and blue LEDs in the projector under the current brightness, and display the current value of the red, green and blue LEDs When the brightness value matches the preset brightness value, make sure the current setting of each LED is correct;

The test terminal is also configured to record the current values of the red, green and blue LEDs at the current brightness, and burn them to the memory of the projector under test through the data acquisition and burn board.

Optionally, the data acquisition and burning board is further configured to determine the current LEDs according to the current brightness value and the preset current values of the red, green and blue LEDs when the current brightness value does not match the preset brightness value Whether the current is adjustable, and output the current adjustment trigger signal/projector optical machine abnormality detection signal;

The test terminal is also configured to control the optomechanical test platform to adjust the current value of the corresponding LED in the red, green and blue LEDs according to the current adjustment trigger signal when the current of each LED is currently adjustable;

When the current value of any one of the red, green and blue LEDs is not adjustable, the abnormality detection signal of the projector optical machine is burned to the memory of the projector optical machine to be tested through the data acquisition and burning board.

Optionally, the data acquisition and burning board is further configured to obtain the adjusted brightness value of the projector optical machine;

When the adjusted brightness value of the projector optical machine matches the preset brightness value, and the current current value of the red, green and blue LEDs is less than the preset current value, it is determined that the current value of each LED is set correctly, And output the adjusted LED current value to the test terminal;

When the brightness value of any one of the red, green and blue LEDs after adjustment does not match the preset brightness value, it is determined that the current value of each LED is set incorrectly, and the projector optical machine abnormality detection signal is output to all The test terminal.

Optionally, the data acquisition and programming board includes a current transformer, a signal conversion circuit, and a main controller. The current transformer is set corresponding to the red, green and blue LEDs, and the output terminal of the current transformer is connected to the The input terminal of the signal conversion circuit is connected, and the output terminal of the signal conversion circuit is connected with the input terminal of the main controller.

Optionally, the signal conversion circuit includes an amplifying and filtering circuit, a filter, a peak hold circuit, and a voltage follower, the input of the amplifying and filtering circuit is the input of the signal conversion circuit; the output of the amplifying and filtering circuit The terminal is connected to the input terminal of the peak hold circuit via the filter, and the output terminal of the peak hold circuit is connected to the input terminal of the voltage follower; the output terminal of the voltage follower is the signal conversion circuit The output terminal.

Optionally, the projector optical-mechanical test system further includes:

The first communication port is configured to realize the communication connection between the test terminal and the main controller.

Optionally, the projector optical-mechanical test system further includes:

The second communication port is configured to realize the memory of the main controller and the optical machine of the projector under test.

The present invention also provides a projector optical-mechanical testing method, the projector optical-mechanical testing method includes:

Drive the projector optical machine to work, and obtain the current brightness value of the projector optical machine and the current value of the red, green and blue LEDs in the projector optical machine at the current brightness;

When the current brightness values of the red, green and blue LEDs all match the preset brightness values, it is determined that the current setting of each LED is correct.

Optionally, after the step of driving the projector optical machine to work, and obtaining the current brightness value of the projector optical machine and the current value of the LED under the current brightness in the projector optical machine, the method further includes:

When the current brightness value does not match the preset brightness value, determine whether the current value of each LED is adjustable according to the current brightness value and the preset current value of the red, green and blue LEDs, and output a current adjustment trigger signal/projection Abnormal detection signal of instrument, optical and machine;

When the current value of each LED is currently adjustable, adjust the current value of the red, green and blue LEDs of the optical machine of the projector to be tested according to the current adjustment trigger signal;

When the current value of any one of the red, green and blue LEDs is not adjustable, recording the abnormality detection signal of the projector optical machine.

Optionally, after the step of adjusting the current values of the red, green, and blue LEDs of the projector under test according to the current adjustment trigger signal when the current value of each LED is currently adjustable, the method further includes:

Acquiring the adjusted brightness value of the projector optical machine;

When the adjusted brightness value of the projector optical machine matches the preset brightness value, and the current current value of the red, green and blue LEDs is less than the preset current value, it is determined that the current value of each LED is set correctly, And record the adjusted LED current value;

The present invention sets a test terminal and outputs a current control signal during testing, so that the optical-mechanical test platform drives the optical-mechanical operation of the projector to be tested according to the current control signal, and is also provided with a data acquisition and burning board, and Obtain the current brightness value of the projector under test and the current value of the red, green and blue LEDs under the current brightness of the projector, and the current brightness values of the red, green and blue LEDs are matched with the preset brightness values At the time, confirm that the current value of each LED is set correctly, and output the determined current value of each LED to the test terminal to record the current value of the red, green and blue LEDs under the current brightness, and burn through the data acquisition and programming board Record to the memory of the projector under test, so as to realize the intelligent test of the projector. The invention improves the intelligence of the optical and mechanical test of the projector, does not require manual operation, and solves the problem that the intelligence of the optical and mechanical test of the projector is low and inconvenient for operators and the problem of recording errors is prone to occur.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on the structures shown in these drawings.

Fig. 1 is a schematic diagram of functional modules of an embodiment of an optical-mechanical testing system for a projector according to the present invention;

2 is a schematic diagram of the circuit structure of an embodiment of the optical-mechanical test system for a projector of the present invention;

3 is a schematic structural diagram of an embodiment of a test terminal in the optical-mechanical test system for a projector of the present invention;

4 is a schematic flowchart of an embodiment of an optical-mechanical testing method for a projector according to the present invention;

5 is a schematic flowchart of another embodiment of the optical-mechanical testing method for a projector according to the present invention;

6 is a schematic flowchart of another embodiment of the optical-mechanical testing method for a projector according to the present invention;

Fig. 7 is a conversion process diagram of the signal conversion circuit in the optical-mechanical test system of the projector of the present invention.

Description with icon number:

标号Label	名称name	标号Label	名称name
100100	测试终端 Test terminal	320320	信号转换电路 Signal conversion circuit
200200	光机测试平台Optical machine test platform	330330	主控制器 main controller
300300	数据采集烧录板Data acquisition programming board	321A、321B、321C321A, 321B, 321C	放大滤波电路Amplifying filter circuit
310A、310B、310C310A, 310B, 310C	电流互感器 Current Transformer	322A、322B、322C322A, 322B, 322C	峰值保持电路Peak hold circuit
323A、323B、323C323A, 323B, 323C	电压跟随器Voltage follower	To	To

The realization of the objectives, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain that it is in a specific posture (as shown in the drawings). If the specific posture changes, the relative positional relationship, movement, etc. of the components below will also change the directional indication accordingly.

In addition, if there are descriptions related to "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and cannot be understood as instructions or implications Its relative importance or implicitly indicates the number of technical features indicated. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that this combination of technical solutions does not exist. , Is not within the protection scope of the present invention.

The invention provides an optical-mechanical test system for a projector.

In the projector optical machine, there are usually LED light sources, condensers, lenses and other structures. The LED sources are usually implemented by RGB red, green and blue LEDs. Due to the difference between the RGB red, green and blue LED bodies, each The current value of the RGB LED drive current of the projector is different, so it is necessary to adjust the LED current value and the set brightness data of the projector, and record the adjusted LED current value and brightness data. At present, the test method of the projector optical machine is usually the scheme of sampling current probe + oscilloscope + PC + burner. The oscilloscope is connected with three current probes to test the current passing through the RGB red, green and blue LEDs. The oscilloscope displays and records the test data. The PC reads and records the test data through USB/serial/Ethernet ports, and the writer will test The data is burned to the optical machine body for use by the whole machine manufacturer. However, this test method needs to manually read the data and make records, import the recorded data to the PC, and then burn to the burner through the PC. It requires manual operation, is intelligent, and is less inconvenient for the operator to make, and it is easy There was a problem with logging errors.

1 and 2, in an embodiment of the present invention, the projector optical-mechanical test system includes:

The test terminal 100 is configured to output a current control signal during testing;

The optical machine test platform 200 is configured to place the optical machine of the projector to be tested, and drive the optical machine of the projector to be tested to work according to the current control signal;

The data acquisition and burning board 300 is configured to obtain the current brightness value of the projector under test and the current value of the red, green and blue LEDs under the current brightness in the projector and the current value of the red, green and blue LEDs. When the current brightness value matches the preset brightness value, make sure the current setting of each LED is correct;

The test terminal 100 is also configured to record the current values of the red, green and blue LEDs at the current brightness, and burn them to the memory of the optical machine of the projector to be tested through the data acquisition and burning board 300.

In this embodiment, the test terminal 100 may be a PC, or a terminal device such as a smart phone, a tablet computer, an e-book reader, and a portable computer.

As shown in FIG. 3, the terminal may include: a processor 101, such as a CPU, a network interface 104, a user interface 103, a memory 105, and a communication bus 102. Among them, the communication bus 102 is used to implement connection and communication between these components. The user interface 103 may include a display screen (Display) and an input unit such as a keyboard (Keyboard), and the optional user interface 103 may also include a standard wired interface and a wireless interface. The network interface 104 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 105 may be a high-speed RAM memory, or a non-volatile memory (non-volatile memory), such as a magnetic disk memory. Optionally, the memory 105 may also be a storage device independent of the aforementioned processor 101.

The light machine test platform 200 is used for placing and fixing the light machine to be measured, and when the light machine to be measured is tested, it drives the light machine to be measured to work according to the control signal output by the test terminal 100 to complete the test of the light machine to be measured .

It is understandable that when the red, green, and blue LEDs are working, the red, green, and blue LEDs light up in a certain order in a working cycle. Due to the differences in the red, green, and blue LEDs, they are at the same brightness. Under the circumstances, the current value of driving the LED may be different. The current value data of the LED drive current is an important parameter tested and recorded by the production line. When adjusting the brightness of the DLP projector, it can be achieved by adjusting the current value of the red, green and blue LED drive current.

Specifically, when testing the DLP projector, the test terminal 100 can first send a current value control command, that is, a current control signal, to the optical machine test platform 200, and the optical machine test platform 200 can control the command according to the current value. Output the corresponding current value to drive the optical machine to work. At this time, the data acquisition and burning board 300 will obtain the actual brightness of the optical engine and the current value that drives the optical engine at this time. The data acquisition and burning board 300 will be red according to the collected actual luminance of the optical engine and the current brightness of the projector optical engine. The current value of the green and blue LEDs is used to determine whether the current brightness value of each LED matches the preset brightness value, so as to determine that the current value of each LED is set correctly.

When the obtained red, green and blue LEDs have the same or almost the same brightness as the red LED, the blue LED and the green LED, it can be determined that the current brightness value matches the preset brightness value. The current brightness of the red, green and blue LEDs If the value matches the preset brightness value, it can be determined that the current value of each LED is set correctly.

When the obtained red, green and blue LEDs, the brightness of one of the LEDs is dark, or the brightness of one of the LEDs is bright, and the brightness of the three colors of LEDs is inconsistent, that is, the current brightness is not The preset brightness is reached. In the following embodiment, the brightness of the red LED is darker than the brightness of the blue LED and the green LED as an example, but it is not limited to this embodiment.

If the brightness of the red LED is darker than the brightness of the blue LED and the green LED among the obtained red, green and blue LEDs, you can increase the current value of the red LED, and/or decrease the red, green and blue of the green LED and the blue LED. The current values of the three-color LEDs are used to adjust the brightness of the red, green and blue LEDs to be consistent or substantially consistent. And in this process, it is necessary to ensure that the brightness of the blue LED and the green LED are within the preset brightness range, or the current value of the red LED does not exceed its maximum current value, to brighten the brightness of the red LED. The brightness of the blue LED and/or the green LED is dimmed until the three color LEDs all reach the preset brightness value, and the brightness of the three is the same or basically the same.

If the brightness of the red LED is darker than the brightness of the blue LED and the green LED, the current adjustment value of the red LED will be adjusted when the brightness of the red LED is dimmed and the brightness of the blue LED and/or green LED is dimmed. When the maximum current value range is exceeded, or the brightness value of the blue LED and the green LED is lower than the preset brightness value, it can be determined that the current value of the optical machine is not adjustable at this time.

The data acquisition and programming board 300 will feed back corresponding detection results to the test terminal 100 based on the detection data, so that the test terminal 100 can act according to the detection results. Specifically, when it is determined that the current value of each LED in the red, green and blue LEDs is set correctly, the test terminal 100 will report the current brightness and color of the light machine fed back by the data acquisition and burn board 300 to the red, green, and blue LEDs. The current value of the LED is burned into the optical engine body through the data acquisition and burn board 300. When it is determined that the current value of the LED in the red, green and blue three-color LEDs is not set correctly, but the current value of the optical machine is adjustable, the corresponding current value adjustment control command can be output according to the adjustment ratio determined by the acquisition and programming board. The optical machine test platform 200 can adjust the control command according to the current value and output the corresponding current value to drive the optical machine to work and change the current brightness of the optical machine until the brightness of each LED of the optical machine reaches the preset brightness. At this time, the data acquisition and burning board 300 will re-record the brightness and current values of the red, green and blue LEDs, and burn them into the optical engine body through the data acquisition and burning board 300. When it is determined that the current value of each LED in the red, green and blue LEDs is not set correctly, and the current value of the optical machine is not adjustable, the test terminal 100 burns the NG information of the optical machine into the optical system through the data acquisition and burning board 300. The body of the machine avoids shipment of NG products.

The present invention sets the test terminal 100 and outputs a current control signal during the test, so that the optical-mechanical test platform 200 drives the optical-mechanical operation of the projector under test according to the current control signal, and is also provided with a data acquisition and burning board 300, and obtain the current brightness value of the projector under test and the current value of the red, green and blue LEDs under the current brightness in the projector, and set the current brightness values of the red, green and blue LEDs to the preset values When the brightness value matches, it is determined that the current value of each LED is set correctly, and the determined current value of each LED is output to the test terminal 100 to record the current value of the red, green and blue LEDs under the current brightness, and through the data collection The burning board 300 is burned to the memory of the optical machine of the projector to be tested, so as to realize the intelligent test of the optical machine of the projector. The invention improves the intelligence of the optical and mechanical test of the projector, does not require manual operation, and solves the problem that the intelligence of the optical and mechanical test of the projector is low and inconvenient for operators, and recording errors are prone to occur.

1 and 2, in one embodiment, the data acquisition and burning board 300 is further configured to determine whether the current value of each LED is current according to the current brightness value when the current brightness value does not match the preset brightness value Adjustable, and output current value adjustment trigger signal/projector optical machine abnormality detection signal;

The test terminal 100 is further configured to control the optical machine test platform 200 to adjust the red, green, and blue LEDs of the optical machine of the projector to be tested when the current value of each LED is currently adjustable. Current value

When the current value of each LED is not adjustable, the abnormality detection signal of the projector optical machine is burned to the memory of the projector optical machine to be tested through the data acquisition and burning board 300.

In this embodiment, the data acquisition board will determine whether the current value of the current dimmer LED is adjusted according to the difference between the acquired current brightness value of each LED and the preset brightness value, and according to the current current value of each LED After exceeding its maximum withstand current value and whether the brightness value of the brighter LED is within the preset brightness value range, to determine whether the current value of each LED is adjustable, the test terminal 100 outputs a corresponding current value adjustment control command to adjust each color The specific gravity of the current value of the LED.

For example, when the brightness of the red LED is darker than the brightness of the other two color LEDs, the current value of the red LED does not exceed its maximum withstand value, and the brightness values of the blue LED and the green LED are not lower than their preset brightness values, then The current value of the red, green and blue LEDs can be adjusted to brighten the brightness of the red LED, or the brightness of the blue LED and the green LED can be dimmed to make the brightness of the red, green and blue LEDs consistent.

Or when the brightness of the blue LED is dim, and the current adjustment value of the blue LED will exceed the maximum current value of the LED, that is, exceed its maximum withstand value, or the brightness of the red and green LEDs will be lower than their preset brightness Value, then after adjusting the brightness of the blue LED, the brightness value of the red or green LED will be dark again, and a new problem of uneven brightness will appear, or the blue LED will work under high current for a long time, which is easy The service life of the optical machine is reduced, and the optical machine may even be damaged in serious cases, and there are potential safety hazards. After confirming that the current value of each LED is not adjustable at this time, the test terminal 100 uses the NG information of the optical machine through the data acquisition and burning board 300 burns into the optical machine body to avoid the shipment of NG products.

It is understandable that the data acquisition and programming board 300 can calculate the difference between the acquired brightness value and the preset brightness value, and then calculate the current adjustment value according to the brightness difference, and then calculate the current adjustment value according to the current adjustment value, The current value of the LED and the preset current value are used to determine whether the current value of each LED is adjustable. Or, when it is determined that the brightness value of any one of the red, green and blue LEDs is less than the preset brightness value, and the current current value of the LED that needs to be adjusted is less than the preset current value, the test terminal 100 is triggered to adjust the brightness of the LED, and During this process, the brightness and current value of the three LEDs are monitored. When the current value of the three LEDs is greater than the preset current value, or the brightness value decreases to the preset brightness value, the test terminal 100 is triggered to stop the test.

1 and 2, in an embodiment, the data acquisition and burning board 300 is further configured to obtain the adjusted brightness value of the projector optical machine;

When the adjusted brightness value of the projector optical machine matches the preset brightness value, it is determined that the current value of each LED is set correctly, and the adjusted current value of the LED is output to the test terminal 100;

When the adjusted brightness value of the projector optical machine matches the preset brightness value, and the current current value of the red, green, and blue LEDs is less than the preset current value, it is determined that the current value of each LED is set correctly and recorded When the current value of the LED is adjusted, it is determined that the current value of each LED is set correctly, and the current value of the adjusted LED is output to the test terminal 100.

In this embodiment, the test terminal 100 outputs a corresponding current value adjustment control instruction, and after adjusting the current value of each color LED, the data acquisition and programming board 300 will collect the adjusted brightness value again, and compare the adjusted brightness value with the preset value. Set the brightness value for comparison.

When the adjusted brightness value reaches the preset value and does not exceed its maximum current value, that is, when it is less than the preset current value, it is determined that the current value of each LED is set correctly, and the data acquisition and programming board 300 will re-record the red The brightness and current values of the green and blue LEDs are burned into the optical engine body through the data acquisition and burn board 300.

When the adjusted brightness value does not reach the preset value, or exceeds the maximum current value of the LED therein, it is determined that the current value of each LED is set incorrectly, and the projector optical machine abnormality detection signal is output to the test terminal 100. 100 The NG information of this optical machine is burned to the optical machine body through the data acquisition and burning board 300 to avoid the shipment of NG products.

1 and 2, in an embodiment, the data acquisition and programming board 300 includes a current transformer (310A, 310B, 310C), a signal conversion circuit 320, and a main controller 330. The current transformer corresponds to The red, green and blue LEDs are arranged, the output terminal of the current transformer is connected to the input terminal of the signal conversion circuit 320, and the output terminal of the signal conversion circuit 320 is connected to the input terminal of the main controller 330.

In this embodiment, the number of current transformers is three, which are respectively marked as 310A, 310B, and 310C, which correspond to each other. Three current transformers are set corresponding to the red, green, and blue LEDs of the optical machine to detect the current flowing through the three LEDs, and convert the detected current signal into a voltage signal of corresponding size, and then output to the signal conversion circuit 320 for signal conversion The circuit 320 amplifies, filters, and performs peak protection processing on the voltage signal and outputs it to the main controller 330. In this embodiment, the current transformer can be realized by adopting an open-type current transformer. The open-ended current transformer samples the current in the wire to facilitate the production line to perform nondestructive measurement of the LED current of the DLP projector without damaging the test equipment. The main controller 330 determines whether the current value settings of the optical engine are correct according to the three pulse signals and the acquired brightness. The filter module in the amplifying filter circuit 321 may be an active or passive filter, and the active filter can be selected in this embodiment. The main controller 330 may be implemented by a microprocessor such as STM32, and the main controller 330 may communicate with the test terminal 100 through a communication interface such as USB, and control the entire test process according to the instructions of the test terminal 100. The main controller 330 is also used to control the peak holding circuit 322 to maintain the peak value of the pulse voltage signal of the front end or clear it.

1 and 2, in an embodiment, the signal conversion circuit 320 includes amplifying and filtering circuits (321A, 321B, 321C), filters (U1A, U1B, U1C) and peak holding circuits (322A, 322B, 322C) , And voltage follower (323A, 323B, 323C), the input end of the amplifying and filtering circuit 321 is the input end of the signal conversion circuit 320; the output end of the amplifying and filtering circuit 321 is connected to the filter U1 The input terminal of the peak hold circuit 322 is connected, and the output terminal of the peak hold circuit 322 is connected with the input terminal of the voltage follower 323; the output terminal of the voltage follower 323 is the output terminal of the signal conversion circuit 320 .

In this embodiment, the signal amplifying circuit in the amplifying and filtering circuit 321 amplifies the signal, and filters out the clutter signal in the voltage signal to reduce the influence of pulse overshoot and ringing on the subsequent circuit. After amplifying the voltage signal, it is output to the main controller 330. The filter module in the amplifying filter circuit 321 may be an active or passive filter, and the active filter can be selected in this embodiment. The voltage follower 323 can realize impedance changes, and transmit the output voltage of the previous stage to the subsequent circuit without influence. The peak hold circuit 322 maintains or clears the high level value of the pulse voltage signal output by the amplifying and filtering circuit 321 under the control of the main controller 330, such as FPGA/CPLD.

Referring to FIG. 7, FIG. 7 is a conversion process diagram of the signal conversion circuit 320, and the specific signal conversion process is:

The pulse voltage signal S0 output by the current transformer is amplified, filtered and filtered, and the voltage signal S1 is output. The relationship between the S0 signal and S1 is:

U _S1 =KU _S0

Among them, K is a constant;

After the voltage signal S1 passes through the peak hold circuit 322 and the voltage follower, the output signal is S2. The relationship between the S2 signal and the S1 signal is:

U _S2 = U _S1

t1 is the peak hold time of the peak hold circuit 322, t2 is the LED peak voltage sampling time, and t3 is the discharge time of the peak hold circuit 322.

1 and 2, in an embodiment, the projector optical-mechanical test system further includes:

The first communication port (not shown in the figure) is configured to realize the communication connection between the test terminal 100 and the main controller 330;

The second communication port (not shown in the figure) is configured to realize the memory of the main controller 330 and the optical machine of the projector under test.

In this embodiment, the first communication port may be a mini USB interface or a TypeC interface, and the test terminal 100 and the main controller 330 may be communicatively connected through the first communication port. The second communication port can be an IIC/SPI interface, and the main controller 330 is in communication connection with the memory EPROM of the optical machine under test. In practical applications, the test terminal 100 can output the current value signal or NG information through the first communication port After reaching the main controller 330 of the data acquisition and burning board 300, the data is burned into the memory EEPROM of the projector optical machine through the second communication port. Moreover, the IIC/SPI interface can be integrated in the main controller 330STM32.

The invention also provides a method for testing the optical and mechanical projectors.

4, the optical and mechanical test method of the projector includes:

Step S100, drive the projector optical machine to work, and obtain the current brightness value, the color LED degree value of the projector optical machine, and the current value of the LED under the current brightness of the projector optical machine;

In this embodiment, the current value data of the LED drive current is an important parameter tested and recorded by the production line. When adjusting the brightness of the DLP projector, it can be achieved by adjusting the current value of the red, green and blue LED drive current.

Step S200: When the current brightness values of the red, green and blue LEDs all match the preset brightness values, it is determined that the current setting of each LED is correct, and the current value of each LED under the current brightness is recorded.

In this embodiment, when the obtained red, green and blue LEDs have the same or substantially the same brightness as the red LED, the blue LED and the green LED, it can be determined that the current brightness value matches the preset brightness value. The current brightness values of the three-color LEDs all match the preset brightness values, and it can be determined that the current value of each LED is set correctly. When it is determined that the current value of each LED in the red, green and blue three-color LEDs is set correctly, the current value of the red, green and blue LEDs under the current brightness of the light machine can be burned into the light machine body to record the red, green and blue colors LED drive current value.

5, in an embodiment, after the step of driving the projector optical machine to work and obtaining the current brightness value of the projector optical machine and the current value of the LED in the projector optical machine at the current brightness, the method further includes:

Step S310: When the current brightness value does not match the preset brightness value, determine whether the current value of each LED is adjustable according to the current brightness value and the preset current value of the red, green and blue LEDs, and output a current adjustment trigger signal/ The abnormal detection signal of the projector optical machine;

Step S320: When the current value of each LED is currently adjustable, adjust the current value of the red, green and blue LEDs of the optical machine of the projector to be tested according to the current adjustment trigger signal;

In this embodiment, among the obtained red, green, and blue LEDs, the brightness of one of the color LEDs is too dark, or the brightness of one of the color LEDs is too bright, making the brightness of the three color LEDs inconsistent, causing the current The brightness has not reached the preset brightness. In the following embodiment, the brightness of the red LED is darker than the brightness of the blue LED and the green LED as an example, but it is not limited to this embodiment.

Step S330: When the current value of any one of the red, green, and blue LEDs is not adjustable, record the optical-mechanical abnormality detection signal of the projector.

6, in one embodiment, after the step of adjusting the current value of the red, green and blue LEDs of the projector under test according to the current value signal when the current value of each LED is currently adjustable Also includes:

Step S321: Obtain the adjusted brightness value of the projector optical machine;

Step S322: When the adjusted brightness value of the projector optical machine matches the preset brightness value, and the current current value of the red, green and blue LEDs is less than the preset current value, determine the current value setting of each LED Correct, and record the adjusted LED current value;

In this embodiment, when the brightness value of each LED reaches the preset value after adjustment, and the brightness value of the LED that does not need to be adjusted does not exceed the maximum value, it is determined that the current value of each LED is set correctly, and red, green, and blue need to be recorded again. The brightness and current value of the three-color LED are burned into the optical machine body.

Step S323: When the brightness value of any one of the red, green and blue LEDs after adjustment does not match the preset brightness value, it is determined that the current value of each LED is set incorrectly, and the projector optical machine abnormality detection is output Signal to the test terminal.

In this embodiment, after determining that the current value is adjustable, output the corresponding current value adjustment control instruction, and adjust the current value of each color LED, collect the adjusted brightness value again, and compare the adjusted brightness value with the preset brightness value In comparison, when the adjusted brightness value does not reach the preset value, and the current value of the LED that needs to be adjusted reaches the maximum value, it is determined that the current value of each LED is set incorrectly, and the projector optical machine abnormality detection signal is output to the test Terminal, the test terminal burns the NG information of the optical machine to the optical machine body through the data acquisition and burning board to avoid the shipment of NG products.

The above descriptions are only optional embodiments of the present invention, and do not limit the scope of the present invention. All the equivalent structural changes made under the inventive concept of the present invention using the contents of the description and drawings of the present invention, or direct/indirect Applications in other related technical fields are included in the scope of patent protection of the present invention.

Claims

A projector optical-mechanical test system, which is characterized in that it comprises:

The test terminal is configured to output current control signals during testing;

The optical machine test platform is configured for placement of the optical machine of the projector under test, and drives the optical machine of the projector under test to work according to the current control signal;

The data acquisition and burning board is configured to obtain the current brightness value of the projector under test and the current value of the red, green and blue LEDs in the projector under the current brightness, and display the current value of the red, green and blue LEDs When the brightness value matches the preset brightness value, make sure the current setting of each LED is correct;

The test terminal is also configured to record the current values of the red, green and blue LEDs at the current brightness, and burn them to the memory of the projector under test through the data acquisition and burn board.
The projector optical-mechanical test system according to claim 1, wherein the data acquisition and burning board is further configured to, when the current brightness value does not match the preset brightness value, according to the current brightness value and the red, green, and blue values. The preset current value of the three-color LED determines whether the current current of each LED is adjustable, and outputs the current adjustment trigger signal/projector optical machine abnormality detection signal;

The test terminal is further configured to control the optomechanical test platform to adjust the current value of the corresponding LED in the red, green and blue LEDs according to the current adjustment trigger signal when the current of each LED is currently adjustable;

When the current value of any one of the red, green and blue LEDs is not adjustable, the abnormality detection signal of the projector optical machine is burned to the memory of the projector optical machine to be tested through the data acquisition and burning board.
3. The projector opto-mechanical testing system of claim 2, wherein the data acquisition and burning board is further configured to obtain the adjusted brightness value of the projector opto-mechanical;

When the adjusted brightness value of the projector optical machine matches the preset brightness value, and the current current value of the red, green and blue LEDs is less than the preset current value, it is determined that the current value of each LED is set correctly, And output the adjusted LED current value to the test terminal;

When the brightness value of any one of the red, green and blue LEDs after adjustment does not match the preset brightness value, it is determined that the current value of each LED is set incorrectly, and the projector optical machine abnormality detection signal is output to all The test terminal.
The projector optical-mechanical test system of claim 1, wherein the data acquisition and burning board comprises a current transformer, a signal conversion circuit, and a main controller, and the current transformer corresponds to the red, green, and blue The color LED is arranged, the output terminal of the current transformer is connected with the input terminal of the signal conversion circuit, and the output terminal of the signal conversion circuit is connected with the input terminal of the main controller.
The projector optical-mechanical test system of claim 4, wherein the signal conversion circuit includes an amplifying filter circuit, a filter, a peak hold circuit, and a voltage follower, and the input of the amplifying filter circuit is the The input terminal of the signal conversion circuit; the output terminal of the amplifying and filtering circuit is connected to the input terminal of the peak hold circuit through the filter, and the output terminal of the peak hold circuit is connected to the input terminal of the voltage follower; The output terminal of the voltage follower is the output terminal of the signal conversion circuit.
5. The projector optical-mechanical test system of claim 4, wherein the projector optical-mechanical test system further comprises:

The first communication port is configured to realize the communication connection between the test terminal and the main controller.
5. The projector optical-mechanical test system of claim 4, wherein the projector optical-mechanical test system further comprises:

The second communication port is configured to realize the memory of the main controller and the optical machine of the projector under test.
A projector optical-mechanical test method, characterized in that the projector optical-mechanical test method includes:

Drive the projector optical machine to work, and obtain the current brightness value of the projector optical machine and the current value of the red, green and blue LEDs in the projector optical machine at the current brightness;

When the current brightness values of the red, green and blue LEDs all match the preset brightness values, it is determined that the current setting of each LED is correct.
The projector opto-mechanical test method according to claim 8, wherein the driving the projector opto-mechanical to work, and obtain the current brightness value of the projector opto-mechanical and the current of the LED under the current brightness of the projector opto-mechanical After the value step also includes:

When the current brightness value does not match the preset brightness value, determine whether the current value of each LED is adjustable according to the current brightness value and the preset current value of the red, green and blue LEDs, and output a current adjustment trigger signal/projection Abnormal detection signal of instrument, optical and machine;

When the current value of each LED is currently adjustable, adjust the current value of the red, green and blue LEDs of the optical machine of the projector to be tested according to the current adjustment trigger signal;

When the current value of any one of the red, green and blue LEDs is not adjustable, recording the abnormality detection signal of the projector optical machine.
9. The projector optomechanical testing method of claim 9, wherein when the current value of each LED is adjustable, the red, green, and blue of the projector optomechanical under test are adjusted according to the current adjustment trigger signal. After the steps of the current value of the three-color LED, it also includes:

Acquiring the adjusted brightness value of the projector optical machine;

When the adjusted brightness value of the projector optical machine matches the preset brightness value, and the current current value of the red, green and blue LEDs is less than the preset current value, it is determined that the current value of each LED is set correctly, And record the adjusted LED current value;

When the brightness value of any one of the red, green and blue LEDs after adjustment does not match the preset brightness value, it is determined that the current value of each LED is set incorrectly, and the projector optical machine abnormality detection signal is output to all The test terminal.