CN110095256B - Projector optical machine testing system and method - Google Patents
Projector optical machine testing system and method Download PDFInfo
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- CN110095256B CN110095256B CN201910383091.4A CN201910383091A CN110095256B CN 110095256 B CN110095256 B CN 110095256B CN 201910383091 A CN201910383091 A CN 201910383091A CN 110095256 B CN110095256 B CN 110095256B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
Abstract
The invention discloses a projector optical machine test system and a method, wherein the projector optical machine test system comprises: a test terminal configured to output a duty modulation signal at a time of test; the optical machine test platform is configured for placing the projector optical machine to be tested and driving the projector optical machine to be tested to work according to the duty ratio modulation signal; the data acquisition burning board is configured to acquire a current brightness value and a chromatic value of a projector optical machine to be detected and duty ratios of the red, green and blue LEDs under the current brightness in the projector optical machine, and when the current brightness value is matched with a preset brightness value and the projector optical machine does not have color cast, the duty ratios of the red, green and blue LEDs are determined to be correctly set; and the test terminal is also configured to record the duty ratio of the red, green and blue LEDs under the current brightness and burn the red, green and blue LEDs into a memory of the projector optical machine to be tested through the data acquisition burning board. The invention improves the intellectualization of the projector optical machine test, does not need manual operation, and solves the problems that the projector optical machine test is low in intellectualization, is inconvenient for operators to make, and is easy to cause recording errors.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a system and a method for testing an optical machine of a projector.
Background
At present, the testing method of the projector optical machine is generally a scheme of sampling a current probe, an oscilloscope, a PC and a recorder. However, the test method needs to manually read and record data, the recorded data is imported into the PC and then is recorded into the recorder through the PC, manual operation is needed, the intelligence is low, the operation is inconvenient for operators, and the problem of recording errors is easily caused.
Disclosure of Invention
The invention mainly aims to provide a projector optical machine testing system and a projector optical machine testing method, and aims to improve the intellectualization of projector optical machine testing.
In order to achieve the above object, the present invention provides a testing system for an optical engine of a projector, comprising:
a test terminal configured to output a duty modulation signal at a time of test;
the optical machine test platform is configured for placing the projector optical machine to be tested and driving the projector optical machine to be tested to work according to the duty ratio modulation signal;
the data acquisition burning board is configured to acquire a current brightness value and a chromatic value of a projector optical machine to be detected and duty ratios of the red, green and blue LEDs under the current brightness in the projector optical machine, and when the current brightness value is matched with a preset brightness value and the projector optical machine does not have color cast, the duty ratios of the red, green and blue LEDs are determined to be correctly set;
the test terminal is also configured to record the duty ratio of the red, green and blue LEDs under the current brightness and burn the red, green and blue LEDs into a memory of the projector optical machine to be tested through the data acquisition burning board.
Optionally, the data acquisition burning board is further configured to determine whether the current duty ratio of the red, green and blue LEDs is adjustable according to the current luminance value and the chromatic value when the current luminance value is not matched with a preset luminance value or the projector light machine has color cast, and output a duty ratio modulation trigger signal/projector light machine abnormality detection signal;
the testing terminal is also configured to control the optical machine testing platform to adjust the duty ratio of the red, green and blue three-color LED to be tested according to the duty ratio modulation trigger signal when the current duty ratio of the red, green and blue three-color LED is adjustable;
and when the current duty ratio of the red, green and blue LEDs is not adjustable, burning abnormal detection signals of the projector optical machine to a memory of the projector optical machine to be detected through the data acquisition burning board.
Optionally, the data acquisition burning board is further configured to obtain a brightness value and a chromatic value of the adjusted projector light engine;
when the brightness value of the projector optical machine is matched with a preset brightness value after adjustment and the projector optical machine has no color cast, determining that the duty ratio of the red, green and blue LEDs is set correctly, and outputting the adjusted duty ratio of the LEDs to the test terminal;
and when the adjusted brightness value of the projector light machine is not matched with the preset brightness value and the projector light machine has color cast, determining that the duty ratio of the red, green and blue LEDs is set incorrectly, and outputting abnormal detection signals of the projector light machine to the test terminal.
Optionally, the data acquisition burning board includes a current transformer, a signal amplification filter circuit, a duty cycle modulation signal generation circuit and a main controller, the current transformer is arranged corresponding to the red, green and blue LEDs, an output end of the current transformer is connected with an input end of the signal amplification filter circuit, and two output ends of the signal amplification filter circuit are connected with two input ends of the duty cycle modulation signal generation circuit in a one-to-one correspondence manner; and the output end of the duty ratio modulation signal generating circuit is connected with the input end of the main controller.
Optionally, the duty ratio modulation signal generating circuit includes a first voltage follower, a second voltage follower, a filter, a peak hold circuit, a voltage reduction circuit, and a voltage comparator, and an input end of the first voltage follower is connected to an output end of the signal amplifying and filtering circuit; the output end of the first voltage follower is connected with the non-inverting input end of the voltage comparator; the input end of the peak holding circuit is connected with the other output end of the signal amplification and filtering circuit through the filter, and the output end of the peak holding circuit is connected with the input end of the voltage reduction circuit; the output end of the voltage reduction circuit is connected with the inverting input end of the voltage comparator; and the output end of the voltage comparator is the output end of the duty ratio modulation signal generating circuit.
Optionally, the projector light engine testing system further includes:
the first communication port is configured to realize communication connection between the test terminal and the main controller.
Optionally, the projector light engine testing system further includes:
and the second communication port is configured to realize the main controller and a memory of the projector optical machine to be tested.
The invention also provides a projector optical machine testing method, which comprises the following steps:
driving a projector optical machine to work, and acquiring the current brightness value and the chromatic value of the projector optical machine and the duty ratio of an LED at the current brightness in the projector optical machine;
and when the current brightness value is matched with a preset brightness value and the color cast of the projector light machine does not appear, determining that the duty ratio of the red, green and blue three-color LED is correctly set, and recording the duty ratio of the red, green and blue three-color LED under the current brightness.
Optionally, after the step of driving the projector light machine to work and acquiring the current brightness value and the chromatic value of the projector light machine and the duty ratio of the LED at the current brightness in the projector light machine, the method further includes:
when the current brightness value of the projector optical machine is not matched with the preset brightness value or the projector optical machine has color cast, determining whether the current duty ratio of the red, green and blue LEDs is adjustable or not according to the current brightness value and the chromatic value, and outputting a duty ratio modulation trigger signal/projector optical machine abnormity detection signal;
when the current duty ratio of the red, green and blue three-color LED is adjustable, adjusting the duty ratio of the red, green and blue three-color LED to be measured according to the duty ratio modulation trigger signal;
and recording abnormal detection signals of the projector light machine when the current duty ratio of the red, green and blue LEDs is not adjustable.
Optionally, when the current duty ratio of the red, green and blue LEDs is adjustable, the step of adjusting the duty ratio of the red, green and blue LEDs according to the duty ratio modulation trigger signal further includes:
acquiring the brightness value and the chromatic value of the adjusted projector optical machine;
when the adjusted brightness value of the projector optical machine is matched with a preset brightness value and the projector optical machine has no color cast, determining that the duty ratio of the red, green and blue LEDs is set correctly, and recording the duty ratio of the adjusted LEDs;
and when the adjusted brightness value of the projector light machine is not matched with the preset brightness value and the projector light machine has color cast, determining that the duty ratio of the red, green and blue LEDs is set incorrectly and outputting abnormal detection signals of the projector light machine.
The testing terminal is arranged, and during testing, a duty ratio modulation signal is output, so that the optical machine testing platform drives the projector optical machine to be tested to work according to the duty ratio modulation signal, the current brightness value and the chromatic value of the projector optical machine to be tested and the duty ratio of the red, green and blue LEDs under the current brightness in the projector optical machine are obtained through the data acquisition burning board, the duty ratio of the red, green and blue LEDs is determined to be correctly set when the current brightness value is matched with the preset brightness value and the color cast of the projector optical machine does not appear, the determined duty ratio of the red, green and blue LEDs is output to the testing terminal to record the duty ratio of the red, green and blue LEDs under the current brightness, and the data acquisition burning board is burnt to the memory of the projector optical machine to be tested, and therefore the intelligent testing of the projector optical machine is achieved. The invention improves the intellectualization of the projector optical machine test, does not need manual operation, and solves the problems that the projector optical machine test is low in intellectualization, is inconvenient for operators to make, and is easy to cause recording errors.
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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an exemplary embodiment of an optical-mechanical testing system of a projector;
FIG. 2 is a schematic circuit diagram of an exemplary embodiment of an optical-mechanical testing system of a projector;
FIG. 3 is a schematic structural diagram of an embodiment of a test terminal in the optical-mechanical test system of the projector according to the present invention;
FIG. 4 is a schematic flow chart illustrating a method for testing an optical engine of a projector according to an embodiment of the invention;
FIG. 5 is a schematic flow chart illustrating a testing method for an optical engine of a projector according to another embodiment of the present invention;
fig. 6 is a schematic flow chart of another embodiment of a method for testing an optical engine of a projector according to the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a projector optical machine test system.
In the projecting apparatus ray apparatus, be provided with LED light source, condensing lens, lens isotructure usually, and the LED source adopts RGB three colour LED to realize usually, because the difference between the RGB three colour LED body, the well RGB three colour LED drive current's of every projecting apparatus ray apparatus duty cycle is different, consequently need adjust the LED duty cycle value and the colour temperature and the luminance data of settlement of projecting apparatus ray apparatus to record adjustment back LED duty cycle value, colour temperature and luminance data. The existing test method of the projector optical machine is generally a scheme of sampling a current probe, an oscilloscope, a PC (personal computer) and a recorder. The oscilloscope is connected with the three current probes to respectively test the current passing through the RGB three-color LED, the oscilloscope displays and records test data, the PC reads and records the test data through ports such as a USB/serial port/Ethernet port and the like, and the recorder records the test data into the optical machine body for a complete machine manufacturer. However, the test method needs to manually read and record data, the recorded data is imported into the PC and then is recorded into the recorder through the PC, manual operation is needed, the intelligence is low, the operation is inconvenient for operators, and the problem of recording errors is easily caused.
Referring to fig. 1 and 2, in an embodiment of the invention, the projector optical engine testing system includes:
a test terminal 100 configured to output a duty modulation signal at a time of a test;
the optical machine test platform 200 is configured to place a projector optical machine to be tested and drive the projector optical machine to be tested to work according to the duty ratio modulation signal;
the data acquisition burning board 300 is configured to acquire a current brightness value and a chromatic value of a projector optical machine to be tested and duty ratios of red, green and blue LEDs under the current brightness in the projector optical machine, and determine that the duty ratios of the red, green and blue LEDs are correctly set when the current brightness value is matched with a preset brightness value and the projector optical machine has no color cast;
the test terminal 100 is further configured to record duty ratios of the red, green and blue LEDs at the current brightness, and burn the red, green and blue LEDs into a memory of the projector optical machine to be tested through the data acquisition burning board 300.
In this embodiment, the test terminal 100 may be a PC, or may also be a terminal device such as a smart phone, a tablet computer, an e-book reader, or a portable computer.
As shown in fig. 3, the terminal may include: a processor 101, e.g. a CPU, a network interface 104, a user interface 103, a memory 105, a communication bus 102. Wherein the communication bus 102 is used for enabling connection communication between these components. The user interface 103 may comprise a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 103 may also comprise a standard wired interface, a wireless interface. The network interface 104 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 105 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). The memory 105 may alternatively be a storage device separate from the processor 101 described above.
The optical machine testing platform 200 is used for placing and fixing the optical machine to be tested, and when the optical machine to be tested is tested, the optical machine to be tested is driven to work according to the control signal output by the testing terminal 100, so that the test of the optical machine to be tested is completed.
It can be understood that, when the red, green and blue LEDs work, the red, green and blue LEDs are turned on in turn according to a certain sequence in a working period, and due to the difference of the red, green and blue LEDs, the duty ratios of the red, green and blue LEDs may be different under the same brightness. The duty ratio data of the LED driving current is an important parameter for production line testing and recording, and can be realized by adjusting the duty ratios of the red, green and blue LED driving currents when the color temperature and the brightness of an optical machine of the DLP projector are adjusted.
Specifically, when testing the DLP projector optical engine, the test terminal 100 may send a duty ratio control instruction to the optical engine test platform 200, and the optical engine test platform 200 may output a corresponding duty ratio according to the duty ratio control instruction, so as to drive the optical engine to work. At this moment, the data acquisition burning board 300 acquires the actual brightness and the chromaticity of the optical machine and the duty ratio of the operation of the optical machine at this moment, and the data acquisition burning board 300 determines whether the current brightness value is matched with the preset brightness value and whether the color cast of the projector optical machine occurs according to the acquired actual brightness and chromaticity of the optical machine and the duty ratio of the red, green and blue three-color LEDs under the current brightness in the projector optical machine, so that the duty ratio of the red, green and blue three-color LEDs is correctly set.
When the brightness of the red LED, the brightness of the blue LED and the brightness of the green LED in the obtained red, green and blue LEDs are consistent or basically consistent, so that the current brightness value can be determined to be matched with the preset brightness value, and the red, green and blue LEDs are not subjected to color cast totally, the duty ratio of the red, green and blue LEDs can be determined to be set correctly.
When the brightness of one of the red, green and blue LEDs is dark or the brightness of one of the red, green and blue LEDs is bright, the brightness of the three LEDs is inconsistent, and the current brightness does not reach the preset brightness. The following examples are described by taking as an example that the luminance of red is darker than the luminance of blue and green, but are not limited to this example.
If the red brightness is darker than the blue and green brightness in the obtained red, green and blue LEDs and the red, green and blue LEDs are generally in a cold tone, the duty ratio proportion of the red, green and blue LEDs can be adjusted to adjust the brightness of the red, green and blue LEDs to be consistent or basically consistent. In the process, the brightness of the red LED is adjusted to be bright, and the brightness of the blue LED and/or the green LED is adjusted to be dark, so that the overall chromaticity of the light machine is adjusted towards the warm tone direction, the color deviation of the light machine is avoided, and the duty ratio of the light machine at the moment can be determined to be adjustable.
If the brightness of red is darker than that of blue and green, and the red, green and blue LEDs are generally in cold and warm adjustment, the duty ratio proportion of the red, green and blue LEDs is adjusted at the moment to adjust the brightness of the red, green and blue LEDs to be consistent or substantially consistent, however, as the brightness of the red LED is adjusted to be bright and the brightness of the blue LED and/or the green LED is adjusted to be dark, the overall chromaticity of the optical machine is adjusted towards the warm tone direction, so that the color cast of the optical machine is more serious, and the duty ratio of the optical machine at the moment can be determined to be not adjustable.
The data acquisition burning board 300 feeds back a corresponding detection result to the test terminal 100 according to the detection data, so that the test terminal 100 acts according to the detection result. Specifically, when it is determined that the duty ratios of the LEDs in the red, green and blue LEDs are correctly set, the test terminal 100 records the duty ratios of the red, green and blue LEDs into the optical machine body through the data acquisition recording board 300 under the current brightness and chromaticity of the optical machine fed back by the data acquisition recording board 300. When the duty ratio of each LED in the red, green and blue LEDs is determined to be incorrectly set, but the duty ratio of the optical machine is adjustable, a corresponding duty ratio adjusting control instruction can be output according to the adjusting proportion determined by the collecting and burning board. The optical machine test platform 200 can adjust the control instruction according to the duty ratio and output the corresponding duty ratio, so as to drive the optical machine to work and change the current brightness and the chromaticity of the optical machine until the brightness of the optical machine reaches the preset brightness and the chromaticity of the optical machine does not have color cast. At this time, the data acquisition burning board 300 records the brightness and duty ratio of the red, green and blue LEDs again, and burns the red, green and blue LEDs into the optical machine body through the data acquisition burning board 300. And when determining that the duty ratio of the red, green and blue LEDs is set incorrectly and the duty ratio of the optical machine is adjustable, the testing terminal 100 records the NG information of the optical machine into the optical machine body through the data acquisition recording board 300, so that the NG products are prevented from being delivered.
The present invention is provided with the test terminal 100, and outputs the duty ratio modulation signal during the test, so that the optical machine testing platform 200 drives the optical machine of the projector to be tested to work according to the duty ratio modulation signal, and the current brightness value and the chromatic value of the projector optical machine to be tested and the duty ratio of the red, green and blue LEDs under the current brightness in the projector optical machine are obtained through the data acquisition burning board 300, and when the current brightness value is matched with the preset brightness value and the color cast of the projector light machine does not appear, the duty ratio of the red, green and blue LEDs is determined to be correctly set, and outputs the determined duty ratios of the red, green and blue LEDs to the test terminal 100, the duty ratio of the red, green and blue LEDs under the current brightness is recorded, and the data acquisition burning board 300 is used for burning the duty ratio to a memory of the projector optical machine to be tested, so that the intelligent test of the projector optical machine is realized. The invention improves the intellectualization of the projector optical machine test, does not need manual operation, and solves the problems that the projector optical machine test is low in intellectualization, is inconvenient for operators to make, and is easy to cause recording errors.
Referring to fig. 1 and fig. 2, in an embodiment, the data acquisition burning board 300 is further configured to determine whether a current duty ratio of the red, green, and blue LEDs is adjustable according to a current luminance value and a chromatic value when the current luminance value is not matched with a preset luminance value or the projector optical engine has color cast, and output a duty ratio modulation trigger signal/projector optical engine abnormality detection signal;
the test terminal 100 is further configured to control the optical machine test platform 200 to adjust the duty ratios of the red, green and blue LEDs to be tested according to the duty ratio modulation signal when the current duty ratios of the red, green and blue LEDs are adjustable;
and when the current duty ratio of the red, green and blue LEDs is not adjustable, burning the abnormal detection signal of the projector optical machine to a memory of the projector optical machine to be tested through the data acquisition burning board 300.
In this embodiment, the data acquisition board may determine, according to the difference between the obtained current luminance value of the red, green, and blue LEDs and the preset luminance value, that the chromaticity of the current optical engine is a cold hue or a warm hue according to the chromaticity value, when the difference between the luminance values of the red, green, and blue LEDs and the hue are in opposite directions, that is, when the luminance of the red, green, and blue LEDs is darker and the chromaticity is colder, the luminance of the red may be brightened by adjusting the duty ratios of the three colors, so that the luminances of the red, green, and blue LEDs are the same, and the chromaticity may be adjusted in the warm direction, so that the optical engine is not color-shifted, so as to determine that the duty ratios of the red, green, and blue LEDs are adjustable, and then the test terminal 100 outputs a corresponding duty ratio adjustment control instruction to adjust the duty ratios of the LEDs of the respective colors.
When the blue brightness is dark and the chroma is warm, the blue brightness can be adjusted to be bright by adjusting the three-color duty ratio, so that the brightness of the red, green and blue LEDs is consistent, and meanwhile, the chroma can be adjusted towards the cold tone direction, so that the color cast is improved. On the contrary, when the blue brightness is dark and the chromaticity is cold, the hue is cold at the moment after the blue brightness is adjusted, so that the hue is cold, the brightness consistency and the color deviation are also not realized, and after the duty ratio of the red, green and blue LEDs is determined to be not adjustable at the moment, the testing terminal 100 records the NG information of the optical machine to the optical machine body through the data acquisition recording board 300, so that the NG product is prevented from being delivered.
It can be understood that the data acquisition burning board 300 may calculate a difference between the acquired brightness value and a preset brightness value, calculate a duty ratio adjustment value according to the brightness difference, determine whether color cast is present according to the acquired chromaticity value, and determine whether the duty ratios of the red, green, and blue LEDs are adjustable according to the current adjustment value, the chromaticity, and the duty ratio adjustment value. Or, when it is determined that the brightness value of any one of the red, green and blue LEDs is smaller than a preset brightness value, the testing terminal 100 is triggered to adjust the brightness of the LEDs, and in this process, the brightness and the chromaticity of the three LEDs are monitored, and when the brightness of the three colors among the three LEDs reaches the preset brightness and color cast occurs, or when the brightness does not reach the preset brightness and color cast occurs, the testing terminal 100 is triggered to stop testing.
Referring to fig. 1 and fig. 2, in an embodiment, the data acquisition burning board 300 is further configured to obtain a brightness value and a chromatic value of the adjusted projector optical engine;
when the adjusted brightness value of the projector optical machine is matched with a preset brightness value and the projector optical machine has no color cast, determining that the duty ratio of the red, green and blue LEDs is correctly set, and outputting the adjusted duty ratio of the LEDs to the test terminal 100;
when the adjusted brightness value of the projector light machine is not matched with the preset brightness value and the projector light machine has color cast, it is determined that the duty ratio of the red, green and blue LEDs is set incorrectly, and an abnormal detection signal of the projector light machine is output to the test terminal 100.
In this embodiment, after the test terminal 100 outputs a corresponding duty ratio adjustment control instruction and adjusts the duty ratio proportion of each color of LED, the data acquisition and burning board 300 acquires the adjusted luminance value and chrominance value again, compares the adjusted luminance value with the preset luminance value, and determines whether the optical machine has color cast.
When the adjusted brightness value reaches the preset value and color cast does not occur, it is determined that the duty ratio of the red, green and blue three-color LED is correctly set, and at this time, the data acquisition burning board 300 can record the brightness and the duty ratio of the red, green and blue three-color LED again and burn the red, green and blue three-color LED into the optical machine body through the data acquisition burning board 300.
When the adjusted brightness value does not reach the preset value and color cast still occurs, it is determined that the duty ratio of the red, green and blue LEDs is set incorrectly, abnormal detection signals of the projector light machine are output to the test terminal 100, the test terminal 100 burns NG information of the light machine to the light machine body through the data acquisition burning board 300, and NG product shipment is avoided.
Referring to fig. 1 and 2, in an embodiment, the data acquisition burning board 300 includes current transformers (310A, 310B, 310C), a signal amplification filter circuit 320, a duty cycle modulation signal generation circuit 330, and a main controller 340, where the current transformers are arranged corresponding to the red, green, and blue LEDs, output ends of the current transformers are connected to input ends of the signal amplification filter circuit 320, and two output ends of the signal amplification filter circuit 320 are connected to two input ends of the duty cycle modulation signal generation circuit 330 in a one-to-one correspondence manner; the output terminal of the duty ratio modulation signal generating circuit 330 is connected to the input terminal of the main controller 340.
In this embodiment, the number of the current transformers is three, and the current transformers are respectively marked as 310A, 310B, and 310C, and correspondingly, the signal amplification filtering circuit 320 includes three signal amplification filtering branches (320A, 320B, and 320C), and the duty ratio modulation signal generating circuit 330 includes three duty ratio modulation signal generating branches (330A, 330B, and 330C), respectively. In this embodiment, the current transformer can be realized by an open-type current transformer, the open-type current transformer samples current in a wire, so that a production line can conveniently perform nondestructive measurement on LED current of a DLP projector, and the test equipment does not need to be damaged. The three current transformers are arranged corresponding to the red, green and blue LEDs of the optical machine to detect currents flowing through the three LEDs, the detected current signals are converted into voltage signals with corresponding sizes and then output to the signal amplification filter circuit 320, and the signal amplification filter circuit 320 filters clutter signals in the voltage signals to reduce the influence of pulse overshoot and ringing on a rear-stage circuit. And after amplifying the voltage signal, the amplified voltage signal is output to the duty ratio modulation signal generation circuit 330, and the duty ratio modulation signal generation circuit 330 outputs a pulse signal representing the duty ratio of the red, green and blue LEDs according to the three voltage signals. The main controller 340 determines whether each duty ratio setting of the optical machine is correct according to the three pulse signals and the acquired brightness and chromaticity. The main controller 340 can be implemented by a microprocessor such as FPGA/CPLD, and the main controller 340 can communicate with the test terminal 100 through a communication interface such as USB power interface, and control the whole test process according to the instruction of the test terminal 100. The main controller 340 is also used to control the peak holding circuit 331 to hold the peak value of the front-end pulse voltage signal or clear.
Referring to fig. 1 and 2, in an embodiment, each duty cycle modulation signal generation branch includes a first voltage follower (U1A, U1B, U1C), a second voltage follower (U2A, U2B, U2C), a peak hold circuit (331A, 331B, 331C), a filter (U4A, U4B, U4C), a voltage reduction circuit (332A, 332B, 332C), and a voltage comparator (U3A, U3B, U3C), an input terminal of the first voltage follower U1 is connected with an output terminal of the signal amplification filter circuit 320; the output end of the first voltage follower U1 is connected with the non-inverting input end of the voltage comparator U3; the input end of the peak holding circuit 331 is connected to the other output end of the signal amplifying and filtering circuit 320 via the filter, and the output end of the peak holding circuit 331 is connected to the input end of the voltage dropping circuit 332; the output end of the voltage reduction circuit 332 is connected with the inverting input end of the voltage comparator U3; the output terminal of the voltage comparator U3 is the output terminal of the duty cycle modulation signal generation circuit 330.
In this embodiment, the filter in the signal amplifying and filtering circuit 320 may be an active filter or a passive filter, and the active filter may be optionally used in this embodiment. The first voltage follower (U1A, U1B, U1C) and the second voltage follower (U2A, U2B, U2C) can realize impedance change, and voltage output by the front stage is transmitted to the rear stage circuit without influence. The voltage reduction circuit 332 is 1/2 voltage reduction circuit 332, which reduces the voltage output by the voltage follower to 50% and sends the voltage to the reverse terminal of the next-stage comparison circuit. The peak hold circuit 331 can be implemented by using an operational amplifier, a diode, a capacitor, or the like. The peak holding circuit 331 holds or clears the high level value of the pulse voltage signal output from the amplification filter circuit based on the control of the main controller 340, for example, FPGA/CPLD. The voltage signal input to the non-inverting terminal of the voltage comparator U3 is derived from the pulse signal output from the first voltage follower U1 at the preceding stage, and the inverting terminal is derived from the dc voltage signal output from the 1/2 step-down circuit 332. The current sensor 310 outputs the acquired current signal to the signal amplification filter circuit 320 and the first voltage follower U1, and then outputs a pulse voltage signal, and the pulse voltage signal is further filtered and subjected to the peak holding circuit 331, the voltage reduction circuit 332 of the second voltage follower U2 and 1/2, and then outputs a direct current voltage signal S1. If the input signal of the non-inverting input terminal of the voltage comparator U3 is S0, the signal of the inverting input terminal is S1, and the output signal is S2, the pulse width of S2 is the same as the pulse width (50% rising edge — 50% falling edge) t of S0. The FPGA clocks the pulse width of S2, so as to obtain the accurate pulse width t of S0.
Referring to fig. 1 and 2, in an embodiment, the projector optical engine testing system further includes:
a first communication port J1 configured to enable communication connection of the test terminal 100 with the main controller 340;
a second communication port J2 configured to implement the main controller 340 and the memory of the projector optical engine under test.
In this embodiment, the first communication port J1 may be a mini USB interface or a TypeC interface, and the test terminal 100 and the main controller 340 may be communicatively connected through the first communication port J1. The second communication port J2 can be an IIC/SPI interface, the controller is in communication connection with a memory EPROM of the projector optical machine to be tested, and in actual application, the test terminal 100 can output the duty cycle modulation signal or the NG information to the main controller 340 of the data acquisition burning board 300 through the first communication port J1, and then burn the data into the memory EEPROM of the projector optical machine through the second communication port J2.
The invention also provides a projector optical machine testing method.
Referring to fig. 4, the method for testing the optical-mechanical device of the projector includes:
step S100, driving a projector optical machine to work, and acquiring the current brightness value and the chromatic value of the projector optical machine and the duty ratio of an LED under the current brightness in the projector optical machine;
in this embodiment, the duty ratio data of the LED driving current is an important parameter for production line testing and recording, and when the color temperature and the brightness of the DLP projector light machine are adjusted, the duty ratio of the red, green and blue LED driving current can be adjusted.
And S200, when the current brightness value is matched with a preset brightness value and the color cast of the projector light machine does not occur, determining that the duty ratio of the red, green and blue LEDs is correctly set, and recording the duty ratio of the red, green and blue LEDs under the current brightness.
In this embodiment, if the brightness of the red LED, the brightness of the blue LED, and the brightness of the green LED in the obtained red, green, and blue LEDs are consistent or substantially consistent, it may be determined that the current brightness value is matched with the preset brightness value, and the total red, green, and blue LEDs have no color cast, it may be determined that the duty ratio of the red, green, and blue LEDs is set correctly. When the duty ratio of the red, green and blue LEDs is determined to be set correctly, the duty ratio of the red, green and blue LEDs under the current brightness and chromaticity of the light machine can be recorded into the light machine body so as to record the duty ratio of the red, green and blue LEDs.
Referring to fig. 5, in an embodiment, after the step of driving the projector optical-mechanical to work, and acquiring the current luminance value and the chromatic value of the projector optical-mechanical and the duty ratio of the LED at the current luminance in the projector optical-mechanical, the method further includes:
step S310, when the current brightness value is not matched with a preset brightness value or the projector optical machine has color cast, determining whether the current duty ratio of the red, green and blue LEDs is adjustable according to the current brightness value and the chromatic value, and outputting a duty ratio modulation trigger signal/projector optical machine abnormity detection signal;
s320, when the current duty ratio of the red, green and blue LED is adjustable, adjusting the duty ratio of the red, green and blue LED to be tested according to the duty ratio modulation trigger signal;
in this embodiment, when the brightness of the LED of one color is too dark or the brightness of the LED of one color is too bright in the obtained three colors of red, green, and blue LEDs, the brightness of the LEDs of the three colors is inconsistent, and the current brightness does not reach the preset brightness. The following examples are described by taking as an example that the luminance of red is darker than the luminance of blue and green, but are not limited to this example.
If the red brightness is darker than the blue and green brightness in the obtained red, green and blue LEDs and the red, green and blue LEDs are generally in a cold tone, the duty ratio proportion of the red, green and blue LEDs can be adjusted to adjust the brightness of the red, green and blue LEDs to be consistent or basically consistent. In the process, the brightness of the red LED is adjusted to be bright, and the brightness of the blue LED and/or the green LED is adjusted to be dark, so that the overall chromaticity of the light machine is adjusted towards the warm tone direction, the color deviation of the light machine is avoided, and the duty ratio of the light machine at the moment can be determined to be adjustable.
And S330, recording abnormal detection signals of the projector light machine when the current duty ratio of the red, green and blue LEDs is not adjustable.
If the brightness of red is darker than that of blue and green, and the red, green and blue LEDs are generally in cold and warm adjustment, the duty ratio proportion of the red, green and blue LEDs is adjusted at the moment to adjust the brightness of the red, green and blue LEDs to be consistent or substantially consistent, however, as the brightness of the red LED is adjusted to be bright and the brightness of the blue LED and/or the green LED is adjusted to be dark, the overall chromaticity of the optical machine is adjusted towards the warm tone direction, so that the color cast of the optical machine is more serious, and the duty ratio of the optical machine at the moment can be determined to be not adjustable.
Referring to fig. 6, in an embodiment, when the current duty ratio of the red, green, and blue LEDs is adjustable, the step of adjusting the duty ratio of the three-color LED of the projector optical machine to be tested according to the duty ratio modulation trigger signal further includes:
step S331, obtaining the brightness value and the chromatic value of the adjusted projector optical machine;
step S332, when the adjusted brightness value of the projector light machine is matched with a preset brightness value and the projector light machine does not have color cast, determining that the duty ratio of the red, green and blue LEDs is set correctly, and recording the duty ratio of the adjusted LEDs;
in this embodiment, when the adjusted brightness value reaches the preset value and color cast does not occur, it is determined that the duty ratio of the red, green and blue LEDs is correctly set, and at this time, the brightness and the duty ratio of the red, green and blue LEDs need to be recorded again and are burned into the optical engine body.
Step S323, when the adjusted brightness value of the projector light machine is not matched with a preset brightness value and the projector light machine has color cast, determining that the duty ratio of the red, green and blue LEDs is set incorrectly, and outputting an abnormal detection signal of the projector light machine.
In this embodiment, after determining that the duty ratio is adjustable, outputting a corresponding duty ratio adjustment control instruction, and adjusting the duty ratio proportion of each color of LED, collecting the adjusted brightness value and chroma value again, comparing the adjusted brightness value with the preset brightness value, and determining whether the color cast occurs in the optical machine, when the adjusted brightness value does not reach the preset value and the color cast still occurs, determining that the duty ratio of the red, green and blue three-color LED is incorrectly set, and outputting a projector optical machine abnormality detection signal to the test terminal, and the test terminal records NG information of the optical machine into the optical machine body through the data acquisition recording board, thereby avoiding NG product shipment.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A projector light engine test system, comprising:
a test terminal configured to output a duty modulation signal at a time of test;
the optical machine test platform is configured for placing the projector optical machine to be tested and driving the projector optical machine to be tested to work according to the duty ratio modulation signal;
the data acquisition burning board is configured to acquire a current brightness value and a chromatic value of the projector optical machine to be tested and duty ratios of the red, green and blue LEDs under the current brightness in the projector optical machine to be tested, and when the current brightness value is matched with a preset brightness value and the projector optical machine to be tested does not have color cast, the duty ratios of the red, green and blue LEDs are determined to be correctly set; the data acquisition burning board is also configured to determine whether the current duty ratio of the red, green and blue LEDs is adjustable according to the current brightness value and the chromatic value when the current brightness value is not matched with a preset brightness value or the projector optical machine has color cast, and output a duty ratio modulation trigger signal/projector optical machine abnormity detection signal;
the data acquisition burning board comprises a current transformer, a signal amplification filter circuit and a duty ratio modulation signal generation circuit, wherein the current transformer is arranged corresponding to the red, green and blue LEDs, the output end of the current transformer is connected with the input end of the signal amplification filter circuit, and the two output ends of the signal amplification filter circuit are correspondingly connected with the two input ends of the duty ratio modulation signal generation circuit one by one;
the test terminal is also configured to record the duty ratio of the red, green and blue LEDs under the current brightness and burn the duty ratio to a memory of a projector optical machine to be tested through the data acquisition burning board; the test terminal is also configured to control the optical machine test platform to adjust the duty ratio of the red, green and blue three-color LED of the projector optical machine to be tested according to the duty ratio modulation trigger signal when the current duty ratio of the red, green and blue three-color LED is adjustable;
the optical machine testing platform outputs a corresponding duty ratio according to the duty ratio adjusting control instruction, so that the optical machine is driven to work, and the current brightness and the chromaticity of the optical machine are changed until the brightness of the optical machine reaches the preset brightness and the chromaticity of the optical machine does not have color cast;
when the current duty ratio of the red, green and blue LEDs is not adjustable, burning abnormal detection signals of the projector optical machine to a memory of the projector optical machine to be tested through the data acquisition burning board;
the duty ratio modulation signal generating circuit comprises a first voltage follower, a second voltage follower, a filter, a peak holding circuit, a voltage reduction circuit and a voltage comparator, wherein the input end of the first voltage follower is connected with one output end of the signal amplification and filtering circuit; the output end of the first voltage follower is connected with the non-inverting input end of the voltage comparator; the input end of the peak holding circuit is connected with the other output end of the signal amplification and filtering circuit through the filter, and the output end of the peak holding circuit is connected with the input end of the voltage reduction circuit through the second voltage follower; the output end of the voltage reduction circuit is connected with the inverting input end of the voltage comparator; and the output end of the voltage comparator is the output end of the duty ratio modulation signal generating circuit.
2. The projector light engine test system of claim 1, wherein the data acquisition burn board is further configured to obtain the adjusted brightness value and chromatic value of the projector light engine;
when the adjusted brightness value of the projector optical machine is matched with a preset brightness value and the projector optical machine has no color cast, determining that the duty ratio of the red, green and blue LEDs is correctly set, and outputting the adjusted duty ratio of the LEDs to the test terminal;
and when the adjusted brightness value of the projector light machine is not matched with the preset brightness value and the projector light machine has color cast, determining that the duty ratio of the red, green and blue LEDs is set incorrectly, and outputting abnormal detection signals of the projector light machine to the test terminal.
3. The projector optical-mechanical testing system of claim 1, wherein the data acquisition burning board further comprises a main controller, and an output terminal of the duty ratio modulation signal generating circuit is connected with an input terminal of the main controller.
4. The projector opto-mechanical testing system of claim 3, further comprising:
the first communication port is configured to realize communication connection between the test terminal and the main controller.
5. The projector opto-mechanical testing system of claim 3, further comprising:
and the second communication port is configured to realize the main controller and a memory of the projector optical machine to be tested.
6. A projector optical-mechanical testing method, based on the projector optical-mechanical testing system of claim 1, the projector optical-mechanical testing method comprising:
driving a projector optical machine to work, and acquiring the current brightness value and the chromatic value of the projector optical machine and the duty ratio of a red, green and blue LED under the current brightness in the projector optical machine;
when the current brightness value is matched with a preset brightness value and the color cast of the projector light machine does not occur, determining that the duty ratio of the red, green and blue three-color LED is correctly set, and recording the duty ratio of the red, green and blue three-color LED under the current brightness;
wherein, still include after the step of the duty cycle of LED under drive projecting apparatus ray apparatus work to current luminance value, colour value and the current luminance in the projecting apparatus ray apparatus of obtaining projecting apparatus ray apparatus:
when the current brightness value is not matched with a preset brightness value or the projector optical machine has color cast, determining whether the current duty ratio of the red, green and blue LEDs is adjustable or not according to the current brightness value and the chromatic value, and outputting a duty ratio modulation trigger signal/projector optical machine abnormity detection signal;
when the current duty ratio of the red, green and blue LEDs is adjustable, adjusting the duty ratio of the red, green and blue LEDs according to the duty ratio modulation trigger signal;
and recording abnormal detection signals of the projector light machine when the current duty ratio of the red, green and blue LEDs is not adjustable.
7. The projector light engine testing method of claim 6, wherein when the current duty cycle of the red, green and blue LEDs is adjustable, the step of adjusting the duty cycle of the red, green and blue LEDs according to the duty cycle modulation trigger signal further comprises:
acquiring the brightness value and the chromatic value of the adjusted projector optical machine;
when the adjusted brightness value of the projector optical machine is matched with a preset brightness value and the projector optical machine has no color cast, determining that the duty ratio of the red, green and blue LEDs is set correctly, and recording the duty ratio of the adjusted LEDs;
and when the adjusted brightness value of the projector light machine is not matched with the preset brightness value and the projector light machine has color cast, determining that the duty ratio of the red, green and blue LEDs is set incorrectly and outputting abnormal detection signals of the projector light machine.
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| CN111708547B (en) * | 2020-06-16 | 2024-03-01 | 重庆京东方智慧电子系统有限公司 | Electronic paper burning device, burning method, computer equipment and medium |
| CN111896232B (en) * | 2020-09-30 | 2021-01-22 | 歌尔光学科技有限公司 | Optical machine module testing method, equipment, system and computer readable storage medium |
| CN112995623A (en) * | 2021-02-19 | 2021-06-18 | 深圳市芯智云信息技术有限公司 | Method for color adjustment of DLP (digital light processing) optical machine |
| CN113933031A (en) * | 2021-10-28 | 2022-01-14 | 歌尔光学科技有限公司 | Projection device with adjustable brightness, optical waveguide detection system and projection system |
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| CN104730823B (en) * | 2015-01-28 | 2017-01-11 | 南靖万利达科技有限公司 | White balance adjustment device and method suitable for DLP projector |
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| CN107342058B (en) * | 2017-08-30 | 2020-04-14 | 创维液晶器件(深圳)有限公司 | Method, test board, system and equipment for adjusting brightness of liquid crystal display module |
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Effective date of registration: 20221121 Address after: 261031 workshop 1, phase III, Geer Photoelectric Industrial Park, 3999 Huixian Road, Yongchun community, Qingchi street, high tech Zone, Weifang City, Shandong Province Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 261031 No. 268 Dongfang Road, hi tech Industrial Development Zone, Shandong, Weifang Patentee before: GOERTEK Inc. |