CN110798188B - Device for automatically adjusting LD current turn-off delay of projector and control method - Google Patents
Device for automatically adjusting LD current turn-off delay of projector and control method Download PDFInfo
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- CN110798188B CN110798188B CN201911103803.9A CN201911103803A CN110798188B CN 110798188 B CN110798188 B CN 110798188B CN 201911103803 A CN201911103803 A CN 201911103803A CN 110798188 B CN110798188 B CN 110798188B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
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- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
Abstract
The invention discloses a device for automatically adjusting the LD current turn-off delay of a projector, which comprises the projector, a projection screen, a brightness test module and a controller, wherein the controller is connected with the brightness test module and is communicated with the brightness test module through a communication protocol; the projector outputs a black field signal and projects the black field signal to a projection screen, the brightness test module measures the screen brightness and transmits brightness data to the controller, and the controller outputs LD current turn-off delay data to the projector after calculation. According to the device for automatically adjusting the LD current waveform of the projector, after a corresponding software method is added, the problem that the LD current waveform of a part of projectors and the reset pulse of a part of DMDs cannot be completely matched in batch production of the projectors can be effectively solved.
Description
Technical Field
The invention relates to the technical field of projectors, in particular to a device for automatically adjusting the current turn-off delay of a projector LD and a control method.
Background
A projector, also called a projector, is a device that can project images or videos onto a curtain, and can be connected with a computer, a VCD, a DVD, a BD, a game machine, a DV, etc. through different interfaces to play corresponding video signals. DMD (digital Light processing) is a core device for realizing digital Light processing of a projector, the service life of the DMD is closely related to the performance of the projector, and a method for improving the service life of the DMD (application No. 201810178247.0; application publication No. CN 108346401; application No. 2018.03.05) proposes a method for improving the service life of the DMD by increasing a DMD reset pulse. Because the state of the mirror on the DMD is uncertain during the reset period of the DMD, the LD current needs to be synchronously turned off in order to avoid the abnormal picture during the reset period of the DMD. The current technical scheme is that a prototype is selected and LD current turn-off delay is adjusted, delay data is stored when a black field brightness test value reaches the lowest value, and the LD current turn-off delay data is stored in a corresponding register for batch production.
In practical production, even for DMDs of the same model, the phase of the DMD reset pulse still differs between individuals, and batch production uses the same LD current turn-off delay data, which brings an adverse effect that the LD current waveform turn-off timing sequence and part of the DMD reset pulse cannot be completely matched, and thus a certain proportion of abnormal poor pictures can appear in batch production.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a device and a control method for automatically adjusting the LD current turn-off delay of a projector, so as to solve the problem that the LD current turn-off delay data and part of DMD reset pulses in the prior art cannot be completely matched.
The invention realizes the purpose through the following technical scheme:
a device for automatically adjusting LD current turn-off delay data of a projector and a control method thereof comprise the projector, a projection screen, a brightness test module and a controller, wherein the controller is connected with the brightness test module and is communicated with the brightness test module through a communication protocol, and the controller is connected with the projector and is communicated with the projector through the communication protocol.
The projector outputs a black field signal and projects the black field signal to a projection screen, the brightness test module measures the screen brightness and transmits brightness data to the controller, and the controller outputs LD current turn-off delay data to the projector after calculation.
Furthermore, the projector has the communication capability with the controller and can automatically finish the LD current turn-off waveform delay adjustment according to the received LD current turn-off delay data.
Furthermore, the brightness test module is a brightness test instrument with a communication function.
Furthermore, the controller comprises a shell, a power supply module, a key module, a data receiving module, an MCU module, a data output module and a message prompting module, wherein the power supply module is used for supplying power to the controller system. The power module comprises a power input interface, the power input interface is exposed out of the casing, the key module and the message prompt module are installed on the front face of the casing, the key module comprises a key 1 and a key 2, the key 1 and the key 2 are exposed out of the casing, the message prompt module comprises an indicator lamp, the indicator lamp is exposed out of the casing, the data receiving module and the data output module are installed on the back face of the casing, the data receiving module comprises a data receiving port, the data receiving port is exposed out of the casing, the data output module comprises a data output port, and the data output port is exposed out of the casing.
Further, the key module includes a key 1 and a key 2, the key 1 is a controller power key for starting and closing the controller, and the key 2 is an adjustment function starting key for starting an adjustment function. The data receiving module receives brightness data from the brightness testing module and transmits the brightness data to the MCU module, the MCU module calculates the received data and transmits LD current turn-off waveform delay data to the data output module, the MCU module transmits message prompt module control data to the message prompt module, the data output port transmits the LD current turn-off waveform delay data to the projector, the data processing result is LD current turn-off waveform delay data, the message prompt module completes adjustment completion prompt according to the controller output data processing result, and the projector receives the LD current turn-off waveform delay data and completes LD current turn-off waveform delay adjustment according to the data.
Further, the power module finishes power supply of the controller system, the power module is connected with AC 220V alternating current, DC 12V is generated through the AC/DC voltage reduction conversion circuit of the power module, and DC 12V generates DC 3.3V through DC/DC to provide working power for the controller module.
Further, the MCU module compares the luminance data received by the data receiving module with a reference luminance value, where the reference luminance value is a black field luminance value that needs to be obtained in advance through experiments when the LD current waveform matches the DMD reset pulse.
The invention also provides a control method for automatically adjusting the LD current turn-off delay of the projector. The control method for automatically adjusting the LD current turn-off delay of the projector comprises the steps of firstly testing the black field brightness value when the LD current waveform is matched with the DMD reset pulse through experiments and setting the black field brightness value as a reference brightness value. And then sending LD current turn-off waveform delay reference data to the projector through the controller, wherein the LD current turn-off waveform delay data is a random value between 0 and the cycle value of the LD current turn-off waveform, and the LD current turn-off waveform cycle is a fixed value determined by the projector system. And testing the brightness of the black field of the screen at the moment, comparing the brightness with a reference brightness value, adding a fine adjustment value to the random value if the test brightness value is greater than the reference brightness value until the test brightness value is less than or equal to the reference brightness value, and completing the adjustment at the moment, wherein the fine adjustment value is a value with a fixed value which is less than the LD current turn-off waveform period, and the fine adjustment value is obtained through experiments, so that the waveform adjustment can be rapidly completed and the step of the adjustment can be met.
The specific working process is as follows:
connecting and starting all parts, and pressing the controller key 2 to start the controller;
the controller outputs LD current turn-off waveform delay reference data t to the projector, and the projector adjusts an LD current turn-off delay value according to the LD current turn-off waveform delay reference data t and outputs a black field to a projection screen;
the brightness test module tests the brightness of the current picture to obtain screen brightness data B and transmits the screen brightness data B to the controller, and the controller receives the screen brightness data B from the brightness test module and compares the screen brightness data B with a reference brightness value A;
if the screen brightness data B is less than or equal to the reference brightness value A, finishing the adjustment, and outputting lighting data to the message prompt module by the MCU module;
if the screen brightness data B is larger than the reference brightness value A, delaying the LD current turn-off waveform by the reference data T and adding the fine tuning time i, and continuing the steps until the screen brightness data B is smaller than or equal to the reference brightness value A, or the number of times of adding the fine tuning time i is larger than N, and stopping debugging, wherein N is the ratio of the LD current turn-off pulse period T to the fine tuning time i, namely the total moving time does not exceed the period value of the LD current turn-off waveform.
The invention has the beneficial effects that:
by the device for automatically adjusting the LD current waveform of the projector, after a corresponding software method is added, the problem that the LD current waveform of part of the projector and the reset pulse of part of the DMD cannot be completely matched in batch production can be effectively solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the embodiments or the drawings needed to be practical in the prior art description, and obviously, the drawings in the following description are only some embodiments of the embodiments, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of the system of the present invention.
Fig. 2 is a block diagram of a controller.
Fig. 3 is a waveform diagram of the system synchronization signal, the DMD reset pulse, and the LD current.
Fig. 4 is a flow chart of the controller software.
Wherein, 1 represents a projector, 2 represents a projection screen, 3 represents a brightness detection module, 4 represents a controller, 401 represents a data receiving module, 402 represents a MUC module, 403 represents a key module, 404 represents a power module, 405 represents a data output module, and 406 represents a message prompting module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In any embodiment, as shown in fig. 1-3, the apparatus for automatically adjusting current waveform of projector LD according to the present invention comprises a projector 1, a projection screen 2, a brightness test module 3 and a controller 4, and a system block diagram thereof is shown in fig. 1, wherein the controller 4 is connected to the brightness test module 3 and communicates with the brightness test module 3 through a communication protocol, and the controller 4 is connected to the projector 1 and communicates with the projector through the communication protocol.
In the above device, the projector 1 outputs a black field signal and projects the black field signal to the projection screen 2, the brightness test module 3 measures brightness and transmits data to the controller 4, and the controller 4 calculates and outputs an LD current waveform to the projector 1.
The projector 1 has the communication capability with the controller 4 and can automatically complete the LD current turn-off waveform delay adjustment according to the received LD current turn-off delay data.
The brightness test module 3 is a brightness test instrument with a communication function.
The controller 4 includes a housing 407, a power module 404, a key module 403, a data receiving module 401, an MCU module 402, a data output module 405, and a message prompting module 406, where the power module 405 and the MCU module 402 are installed in the housing 407, the power module includes a power input interface exposed from the housing 407, the key module 403 and the message prompting module 406 are installed on the front side of the housing 407, the key module includes a key 1 and a key 2, the key 1 and the key 2 are exposed from the housing 407, the message prompting module 406 includes an indicator light exposed from the housing 407, the data receiving module 401 and the data output module 405 are installed on the back side of the housing 407, the data receiving module 401 includes a data receiving port exposed from the housing 407, and the data output module 405 includes a data output port, the data output port is exposed in the housing 407.
The power module 404 completes the system power supply of the controller 4. The key module 403 includes a key 1 and a key 2, where the key 1 is a power key of the controller 4 and is used to start and close the controller 4, and the key 2 is an adjustment function start key and is used to start an adjustment function. The data receiving module 401 receives brightness data from the brightness testing module 3 and transmits the brightness data to the MCU module 402, the MCU module 402 calculates the received data and transmits LD current turn-off waveform delay data to the data output module, the MCU module transmits message prompt module control data to the message prompt module, the data output port transmits LD current turn-off waveform delay data to the projector, the data processing result is LD current turn-off waveform delay data, the message prompt module completes an "adjustment complete" prompt according to the controller output data processing result, and the projector receives LD current turn-off waveform delay data and completes LD current turn-off waveform delay adjustment according to the data.
The power module 404 is connected with AC 220V alternating current, DC 12V is generated by the power module 404AC/DC step-down conversion circuit, and DC 3.3V is generated by the DC 12V through DC/DC, so as to provide working power for the controller module 4.
The MCU module 402 compares the luminance data received by the data receiving module 401 with a reference luminance value, which is obtained by experiment in advance when the LD current waveform matches the DMD reset pulse.
According to the description of the present embodiment, the projector 1, the screen 2 and the brightness testing module 3 are all prior art, and will not be described in detail here.
In any embodiment, as shown in fig. 4, a control method for automatically adjusting the current turn-off delay of a projector LD according to the present invention. The control method for automatically adjusting the LD current turn-off delay of the projector comprises the steps of firstly testing the black field brightness value when the LD current waveform is matched with the DMD reset pulse through experiments and setting the black field brightness value as a reference brightness value. And then sending LD current turn-off waveform delay reference data to the projector through the controller, wherein the LD current turn-off waveform delay data is a random value between 0 and the cycle value of the LD current turn-off waveform, and the LD current turn-off waveform cycle is a fixed value determined by the projector system. And testing the brightness of the black field of the screen at the moment, comparing the brightness with a reference brightness value, adding a fine adjustment value to the random value if the test brightness value is greater than the reference brightness value until the test brightness value is less than or equal to the reference brightness value, and completing the adjustment at the moment, wherein the fine adjustment value is a value with a fixed value which is less than the LD current turn-off waveform period, and the fine adjustment value is obtained through experiments, so that the waveform adjustment can be rapidly completed and the step of the adjustment can be met.
The specific working process is as follows:
connecting and starting all parts, and pressing the controller key 2 to start the controller;
the controller outputs LD current turn-off waveform delay reference data t to the projector, and the projector adjusts an LD current turn-off delay value according to the LD current turn-off waveform delay reference data t and outputs a black field to a projection screen;
the brightness test module tests the brightness of the current picture to obtain screen brightness data B and transmits the screen brightness data B to the controller, and the controller receives the screen brightness data B from the brightness test module and compares the screen brightness data B with a reference brightness value A;
if the screen brightness data B is less than or equal to the reference brightness value A, finishing the adjustment, and outputting lighting data to the message prompt module by the MCU module;
if the screen brightness data B is larger than the reference brightness value A, delaying the LD current turn-off waveform by the reference data T and adding the fine tuning time i, and continuing the steps until the screen brightness data B is smaller than or equal to the reference brightness value A, or the number of times of adding the fine tuning time i is larger than N, and stopping debugging, wherein N is the ratio of the LD current turn-off pulse period T to the fine tuning time i, namely the total moving time does not exceed the period value of the LD current turn-off waveform.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition. In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (5)
1. A control method of a device for automatically adjusting the LD current turn-off delay of a projector comprises the projector, a projection screen, a brightness test module and a controller, and is characterized in that the controller is connected with the brightness test module and is communicated with the brightness test module through a communication protocol, the controller is connected with the projector and is communicated with the projector through the communication protocol;
the projector outputs a black field signal and projects the black field signal to a projection screen, the brightness test module measures the screen brightness and transmits brightness data to the controller, and the controller outputs LD current turn-off delay data to the projector after calculation;
the controller comprises a shell, a power supply module, a key module, a data receiving module, an MCU module, a data output module and a message prompt module, wherein the power supply module is used for supplying power to the controller system;
the power supply module comprises a power supply input interface, the power supply input interface is exposed out of the shell, the key module and the message prompt module are installed on the front face of the shell, the key module comprises a key 1 and a key 2, the key 1 and the key 2 are exposed out of the shell, the message prompt module comprises an indicator lamp, the indicator lamp is exposed out of the shell, the data receiving module and the data output module are installed on the back face of the shell, the data receiving module comprises a data receiving port, the data receiving port is exposed out of the shell, the data output module comprises a data output port, and the data output port is exposed out of the shell;
the key module comprises a key 1 and a key 2, wherein the key 1 is a controller power key for starting and closing the controller, and the key 2 is an adjusting function starting key for starting an adjusting function;
the data receiving module receives brightness data from the brightness testing module and transmits the brightness data to the MCU module, the MCU module calculates the received data and transmits LD current turn-off waveform delay data to the data output module, the MCU module transmits message prompt module control data to the message prompt module, the data output port transmits the LD current turn-off waveform delay data to the projector, the data processing result is LD current turn-off waveform delay data, the message prompt module completes 'adjustment completion' prompt according to the controller output data processing result, and the projector receives the LD current turn-off waveform delay data and completes LD current turn-off waveform delay adjustment according to the data;
the MCU module compares the brightness data received by the data receiving module with a reference brightness value, wherein the reference brightness value is obtained by experiments in advance when the LD current waveform is matched with the DMD reset pulse;
the control method of the device for automatically adjusting the LD current turn-off delay of the projector comprises the following steps:
testing the black field brightness value when the LD current waveform is matched with the DMD reset pulse through experiments and setting the black field brightness value as a reference brightness value;
then, sending LD current turn-off waveform delay reference data to the projector through the controller, wherein the LD current turn-off waveform delay data is a random value between 0 and an LD current turn-off waveform period value, and the LD current turn-off waveform period is a fixed value determined by the projector system;
and testing the screen black field brightness at the moment and comparing the screen black field brightness with the reference brightness value, if the test brightness value is greater than the reference brightness value, adding a fine adjustment value to the random value until the test brightness value is less than or equal to the reference brightness value, and finishing the adjustment at the moment.
2. The method as claimed in claim 1, wherein the projector has a communication capability with the controller and is capable of automatically performing the LD current off waveform delay adjustment according to the received LD current off delay data.
3. The method as claimed in claim 1, wherein the brightness testing module is a brightness testing instrument with communication function.
4. The method as claimed in claim 1, wherein the power module supplies power to the controller system, the power module is connected to AC 220V AC, the AC/DC buck converter circuit of the power module generates DC 12V, and the DC 12V generates DC 3.3V through DC/DC to provide operating power for the controller module.
5. The method as claimed in claim 1, wherein the step of controlling the device for automatically adjusting the current turn-off delay of the projector LD comprises the following steps:
connecting and starting all parts, and pressing the controller key 2 to start the controller;
the controller outputs LD current turn-off waveform delay reference data t to the projector, and the projector adjusts an LD current turn-off delay value according to the LD current turn-off waveform delay reference data t and outputs a black field to a projection screen;
the brightness test module tests the brightness of the current picture to obtain screen brightness data B and transmits the screen brightness data B to the controller, and the controller receives the screen brightness data B from the brightness test module and compares the screen brightness data B with a reference brightness value A;
if the screen brightness data B is less than or equal to the reference brightness value A, finishing the adjustment, and outputting lighting data to the message prompt module by the MCU module;
if the screen brightness data B is larger than the reference brightness value A, delaying the LD current turn-off waveform by the reference data T and adding the fine tuning time i, and continuing the steps until the screen brightness data B is smaller than or equal to the reference brightness value A, or the number of times of adding the fine tuning time i is larger than N, and stopping debugging, wherein N is the ratio of the LD current turn-off pulse period T to the fine tuning time i, namely the total moving time does not exceed the period value of the LD current turn-off waveform.
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