WO2019140786A1

WO2019140786A1 - Projector-based control method and projector

Info

Publication number: WO2019140786A1
Application number: PCT/CN2018/080893
Authority: WO
Inventors: 鄢圣巍; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2018-01-20
Filing date: 2018-03-28
Publication date: 2019-07-25
Also published as: CN110072090B; CN110072090A

Abstract

A projector, comprising: a video recognition module (11), used for receiving and parsing a video signal to obtain bright and dark states of the video signal; a power controller (12), used for dynamically adjusting laser power according to the bright and dark states of the video signal; a laser (13), used for controlling the laser light brightness of laser light to be transmitted according to the laser power and transmitting the laser light; and a digital micro-mirror assembly (14), used for receiving and reflecting the laser light. Also disclosed is a projector-based control method. By dynamically adjusting the brightness of the laser light, under the condition that video effects sensed by human eyes do not change, the heating power consumption of the projector is reduced, and therefore, the temperature of the whole machine is reduced.

Description

Projector-based control method and projector

Technical field

The present invention relates to the field of projectors, and in particular to a projector-based control method and a projector.

Background technique

As the level of technology continues to increase, the demand for video continues to increase. The demand for large screen high brightness display is increasing day by day. In this context, the laser brightness of the projector is required to continue to increase. As the brightness of the laser increases, the power consumption increases, and the temperature of the projector rises, which does not guarantee the normal operation of the projector. To put it another way, the heat dissipation of the projector has become a bottleneck that limits the improvement of laser brightness.

Therefore, how to ensure that the human eye perceives the video effect is the same, reducing the heat consumption of the projector and lowering the overall temperature of the projector is an urgent problem to be solved.

Summary of the invention

In view of this, the technical problem to be solved by the present invention is to provide a projector-based control method and a projector, which can ensure that the human eye perceives the video effect without changing the heat consumption of the projector and reduces the overall brightness of the projector. Machine temperature.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a projector, comprising: a video recognition module, configured to receive and parse a video signal to obtain a light and dark state of a video signal; and a power controller for The light and dark state of the video signal dynamically adjusts the laser power; the laser is used to control the laser brightness of the laser to be emitted according to the laser power and emit the laser; and the digital micromirror assembly is configured to receive and reflect the laser.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a projector-based control method, the projector including a video recognition module, a power controller, a laser, and a digital micromirror assembly, the method comprising: utilizing The video recognition module receives and parses the video signal to obtain a light and dark state of the video signal; uses a power controller to dynamically adjust the laser power according to the light and dark state of the video signal; and uses the laser to control the laser brightness of the laser to be emitted according to the laser power and emits the laser; The digital micromirror assembly receives and reflects the laser.

The invention has the beneficial effects that the invention receives and parses the video signal to obtain the light and dark state of the video signal, and then dynamically adjusts the laser power according to the light and dark state of the video signal, thereby controlling the laser brightness of the laser to be emitted according to the laser power and transmitting. laser. In the above manner, the present invention can ensure that the human eye perceives the video effect without changing the heat consumption of the projector and thereby reduces the overall temperature of the projector.

DRAWINGS

1 is a schematic structural view of a projector according to a first embodiment of the present invention;

2 is a schematic diagram showing the relationship between laser current and video signal in the present invention;

3 is a schematic structural view of a projector according to a second embodiment of the present invention;

4 is a schematic structural view of a projector according to a third embodiment of the present invention;

Figure 5 is a schematic structural view of a projector according to a fourth embodiment of the present invention;

6 is a flowchart of a projector-based control method according to a first embodiment of the present invention;

7 is a flow chart of a projector-based control method according to a second embodiment of the present invention;

FIG. 8 is a flowchart of a projector-based control method according to a third embodiment of the present invention; FIG.

9 is a flowchart of a projector-based control method according to a fourth embodiment of the present invention;

Figure 10 is a flow chart showing a projector-based control method of a fifth embodiment of the present invention.

Detailed ways

Certain terms are used throughout the description and the claims to refer to the particular embodiments. It will be understood by those skilled in the art that the <RTIgt; The present specification and claims do not use the difference in names as a means of distinguishing components, but rather as a basis for distinguishing between functional differences of components. The invention will now be described in detail in conjunction with the drawings and embodiments.

1 is a schematic structural view of a projector according to a first embodiment of the present invention. As shown in FIG. 1, the projector 100 includes a video recognition module 11, a current controller 12, a laser 13, a digital micromirror assembly 14, and a light absorber 15.

The video recognition module 11 is configured to receive and parse the video signal to obtain a light and dark state of the video signal. Specifically, the operation of the video recognition module 11 to receive and parse the video signal to obtain the light and dark state of the video signal includes: acquiring a binary signal corresponding to the video signal, the binary signal includes “0” and “1”; and acquiring in the binary signal “ a quantity ratio of 0"; determining whether the quantity ratio is greater than a predetermined ratio; determining that the video signal is in the first state when the quantity ratio is greater than the predetermined ratio; and determining that the video signal is in the second state when the quantity ratio is less than or equal to the predetermined ratio . The first state is a dark state, and the second state is a bright state.

In this embodiment, the video recognition module 11 is a field programmable gate array (FPGA). FPGA has the characteristics of fast speed and accurate identification. Therefore, the use of FPGA for digital signal, that is, binary signal recognition, can ensure the real-time and accuracy of recognition. In other embodiments, the video recognition module 11 can also be a digital signal processor (DSP), a microcontroller (MCU), a microprocessor (MPU), and the like.

In the present embodiment, the predetermined ratio is preferably 80%. That is to say, when the ratio of the number of "0" in the binary signal to the total number of "0"s and "1"s in the binary signal is greater than 80%, the video signal is in the first state, and the video signal is in the first state. Two states.

For example, in the binary signal, the pure black signal is 0x00, and the ratio of the number of "0" in the pure black signal is 100%, which is greater than the predetermined ratio of 80%, indicating that when the video signal is a pure black signal, the video signal is at The first state; the pure white signal is 0xFF, and the ratio of the number of "0" in the pure white signal is 0, which is less than the predetermined ratio of 80%, indicating that when the video signal is a pure white signal, the video signal is in the second state; Binary signal, when the number of "0" in the binary signal is 7, the video signal corresponding to the binary signal is in the first state, and when the number of "0" in the signal is 2, 3, 4, 5 or 6 Then, the video signal corresponding to the binary signal is in the second state.

Certainly, those skilled in the art can understand that the above description is based on the case where the binary signal is an eight-bit binary number and the predetermined ratio is 80%. The present invention is not limited thereto, and the binary signal may be, for example, sixteen bits. The binary number, the predetermined ratio may be, for example, 70% or the like.

The current controller 12 is coupled to the video recognition module 11 for dynamically adjusting the laser current according to the light and dark state of the video signal recognized by the video recognition module 11. Specifically, the operation of the current controller 12 to dynamically adjust the laser current according to the light and dark state of the video signal includes: adjusting the laser current to a full current load when the video signal is in the second state; and, when the video signal is in the first state The laser current is adjusted to a partial current load according to the number of "0". Preferably, the full current load is 100%, the partial current load is 1/(X+20%)^12, and X is a quantitative ratio of "0".

Taking the above example, please refer to FIG. 2 together. FIG. 2 is a schematic diagram showing the relationship between laser current and video signal in the present invention. As shown in FIG. 2, the horizontal axis represents the numerical ratio of "0" in the video signal, and the vertical axis represents the laser current.

When the video signal is in the second state, that is, the ratio of the number of "0" is less than or equal to 80%, the laser current is a full current load, that is, 100%. When the video signal is in the first state, that is, the number ratio of "0" is greater than 80%, the laser current is a partial current load, and as the ratio of "0" gradually increases, part of the current load gradually decreases.

The laser 13 is coupled to the current controller 12 for controlling the brightness of the laser light to be emitted and emitting the laser light according to the laser current output from the current controller 12. Among them, the laser brightness of the laser becomes brighter as the laser current becomes larger, and becomes darker as the laser current becomes smaller. Those skilled in the art will appreciate that the brighter the laser, the higher the laser energy emitted, and the greater the heat dissipation of the projector.

A digital micromirror assembly (DMD) 14 is used to receive and reflect the laser light emitted by the laser 13. The light absorber 15 is for absorbing the laser light emitted by the digital micromirror assembly 14.

In particular, digital micromirror assembly 14 includes a plurality of lenses that are flipped at a high speed in accordance with the brightness of the video signal to bring the lens into a first position or a second position. When the lens is in the first position, the lens reflects most of the energy in the dark portion of the video to the light absorber 15 to prevent the user from seeing portions of the dark area of the video, while the lens (not shown) absorbs the reflection from the lens. A small portion of the energy in the dark area of the video. When the lens is in the second position, the lens reflects most of the energy in the bright region of the video to the lens as a video image output, while the light absorber 15 absorbs a small portion of the energy of the bright region of the video that is not reflected by the lens.

In this embodiment, when the video signal is in the first state, the laser is driven by the laser current of a part of the current load, thereby reducing the brightness of the laser light emitted by the laser 13, that is, the laser energy, thereby reducing the laser energy received by the light absorber 15 to The temperature of the light absorber 15 is lowered, thereby reducing the heat power of the projector. At the same time, it is also possible to solve the problem that the ultimate temperature resistance of the light absorber 15 becomes a bottleneck that hinders the improvement of the laser brightness. When the video signal is in the second state, the laser current is driven by the laser current of the full current load, thereby ensuring that the video effect perceived by the human eye does not change.

That is to say, in the present embodiment, by dynamically adjusting the laser current, that is, dynamically adjusting the laser brightness of the laser, it is possible to reduce the heat generation power consumption and reduce the overall temperature of the projector while the human eye perceives the video effect.

This embodiment is described by taking a current controller as an example. In this embodiment, the current controller is used to dynamically adjust the laser current according to the light and dark state of the video signal, and then control the laser brightness of the laser to be emitted according to the laser current. In other embodiments, the voltage controller and the power controller may be used instead of the current controller in the embodiment, that is, the voltage controller may also be used to dynamically adjust the laser voltage according to the brightness state of the video signal, and then The laser voltage controls the laser brightness of the laser to be emitted; or the power controller can also dynamically adjust the laser power according to the brightness state of the video signal, and then control the laser brightness of the laser to be emitted according to the laser power.

Fig. 3 is a schematic structural view of a projector according to a second embodiment of the present invention. As shown in FIG. 3, the projector 200 shown in FIG. 3 differs from the projector 100 shown in FIG. 1 in that the projector 200 further includes a temperature sensor 21 disposed on the light absorber 15. The temperature sensor 21 is used to acquire the temperature on the light absorber 15. The current controller 12 is further coupled to the temperature sensor 21 for adjusting the laser current according to the temperature acquired by the temperature sensor 21.

In this embodiment, the operation of the current controller 12 to adjust the laser current according to the temperature is: the current controller 12 determines whether the temperature exceeds a predetermined high temperature threshold; if the temperature exceeds the predetermined high temperature threshold, the current controller 12 reduces the laser current according to the first predetermined rule. .

Wherein, the first predetermined rule is independent of the video signal, and the laser current is reduced according to the first predetermined rule to avoid damage to the projector due to excessive temperature, thereby achieving the purpose of protecting the projector.

Specifically, the first predetermined rule may be to reduce the laser current to 0, that is, to turn off the laser, or to reduce the laser current to half of the current laser current, and the like.

4 is a schematic structural view of a projector according to a third embodiment of the present invention. As shown in FIG. 4, the projector 300 shown in FIG. 4 differs from the projector 100 shown in FIG. 1 in that the projector 300 further includes an illumination sensor 31 disposed on the light absorber 15.

The illumination sensor 31 is used to acquire the intensity of light on the light absorber 15. The current controller 12 is further coupled to the illumination sensor 31 for adjusting the laser current according to the illumination intensity acquired by the illumination sensor 31.

In this embodiment, the operation of the current controller 12 to adjust the laser current according to the illumination intensity may be: the current controller 12 determines whether the illumination intensity exceeds a predetermined high intensity threshold; if the illumination intensity exceeds a predetermined high intensity threshold, the current controller 12 follows the first The second predetermined rule reduces the laser current.

Wherein, the second predetermined rule is independent of the video signal, and the laser current is reduced according to the second predetermined rule to avoid damage to the projector due to excessive temperature, thereby achieving the purpose of protecting the projector.

Specifically, the second predetermined rule may be to reduce the laser current to 0, that is, to turn off the laser, or to reduce the laser current to half of the current laser current, and the like.

Fig. 5 is a schematic structural view of a projector according to a fourth embodiment of the present invention. As shown in FIG. 5, the projector 400 shown in FIG. 5 differs from the projector 100 shown in FIG. 1 in that the projector 400 further includes a temperature sensor 22 and an illumination sensor 32 disposed on the light absorber 15.

The temperature sensor 22 is for acquiring the temperature on the light absorber 15, and the illumination sensor 32 is for obtaining the light intensity on the light absorber 15.

The current controller 12 is coupled to the temperature sensor 22 and the illumination sensor 32 for adjusting the laser current according to the temperature acquired by the temperature sensor 22 and/or the illumination intensity acquired by the illumination sensor 32.

In the present embodiment, the operation of the current controller 12 to adjust the laser current according to the temperature acquired by the temperature sensor 22 and/or the illumination intensity acquired by the illumination sensor 32 includes: the current controller 12 determines whether the temperature exceeds a predetermined high temperature threshold; if the temperature exceeds a predetermined temperature The high temperature threshold, the current controller 12 reduces the laser current according to the first predetermined rule; or, the current controller 12 determines whether the illumination intensity exceeds a predetermined high intensity threshold; if the illumination intensity exceeds the predetermined high intensity threshold, the current controller 12 follows the second predetermined rule Reducing the laser current; or, the current controller 12 determines whether the temperature exceeds a predetermined high temperature threshold and whether the illumination intensity exceeds a predetermined high intensity threshold; if the temperature exceeds a predetermined high temperature threshold and the illumination intensity exceeds a predetermined high intensity threshold, the current controller 12 follows the third predetermined Regularly reduce the laser current.

Wherein, the third predetermined rule is independent of the video signal, and the laser current is reduced according to the third predetermined rule to avoid damage to the projector due to excessive temperature, thereby achieving the purpose of protecting the projector.

Specifically, the third predetermined rule may be to lower the laser current to 0, that is, to turn off the laser, or to reduce the laser current to one-third of the current laser current, and the like.

6 is a flow chart of a projector-based control method according to a first embodiment of the present invention, wherein the projector includes a video recognition module, a current controller, a laser, a digital micromirror assembly, and a light absorber. It should be noted that the method of the present invention is not limited to the sequence of processes shown in FIG. 6 if substantially the same result is obtained. As shown in FIG. 6, the method includes the following steps:

Step S101: Receive and parse the video signal by using the video recognition module to obtain a light and dark state of the video signal.

In step S101, the step of receiving and parsing the video signal by the video recognition module to obtain the light and dark state of the video signal comprises: acquiring a binary signal corresponding to the video signal, the binary signal including "0" and "1"; acquiring in the binary signal a quantity ratio of “0”; determining whether the quantity ratio is greater than a predetermined ratio; determining that the video signal is in the first state when the quantity ratio is greater than the predetermined ratio; and determining that the video signal is in the second state when the quantity ratio is less than or equal to the predetermined ratio status. Among them, the predetermined ratio is preferably 80%. The first state is a dark state, and the second state is a bright state.

Step S102: dynamically adjusting the laser current according to the brightness state of the video signal by using the current controller.

In step S102, the step of dynamically adjusting the laser current according to the light and dark state of the video signal by using the current controller comprises: adjusting the laser current to a full current load when the video signal is in the second state; and, when the video signal is in the first state When the amount of "0" is adjusted, the laser current is adjusted to be part of the current load.

Preferably, the full current load is 100%, and the partial current load is 1/(X+20%)^12, where X is a quantitative ratio of "0".

Step S103: The laser is used to control the brightness of the laser light to be emitted according to the laser current and emit the laser light.

In step S103, the laser luminance of the laser light becomes brighter as the laser current becomes larger, and becomes darker as the laser current becomes smaller. Specifically, when the video signal is in the first state, the laser current is a full current load, and the laser brightness of the laser ensures normal laser brightness; when the video signal is in the second state, the laser current is a dynamically changing partial current load, thereby dynamically Reduce the laser brightness of the laser.

Step S104: Receiving and reflecting the laser light using the digital micromirror assembly.

Step S105: Absorbing the laser light reflected by the digital micromirror assembly by using the light absorber.

In steps S104 to S105, the digital micromirror assembly includes a plurality of lenses, and the digital micromirror assembly flips the lens at a high speed according to the brightness of the video signal to bring the lens into the first position or the second position. When the lens is in the first position, the lens reflects most of the energy in the dark area of the video to the light absorber to avoid the user seeing portions of the dark area of the video, while the lens absorbs a small portion of the dark area of the video that is not reflected by the lens. energy. When the lens is in the second position, the lens reflects most of the energy in the bright portion of the video to the lens as a video image output, while the light absorber absorbs a small portion of the energy of the bright portion of the video that is not reflected by the lens.

In this embodiment, when the video signal is in the first state, the laser current is driven by a partial current load to reduce the laser brightness of the laser, thereby reducing the energy of the laser to emit laser light, thereby reducing the laser energy received by the light absorber. Reducing the temperature of the light absorber, thereby reducing the overall power consumption of the projector and solving the limit temperature resistance of the light absorber become a bottleneck that hinders the improvement of the laser brightness. When the video signal is in the second state, the laser current is driven by the full current load to maintain the brightness of the laser as normal brightness, thereby ensuring that the video effect perceived by the human eye does not change.

The technical effects of the above projector-based control method will be evaluated in three examples:

1. When the video signal is in the second state, the current controller sets the laser current to be a full current load, and the laser outputs a laser with a brightness of 100%. After being reflected by the digital micromirror assembly, 90% of the brightness is reflected to the lens as a video image output. 10% of the brightness is reflected to the light absorber, generating heat. At this time, the video signal recognized by the video recognition module has a binary representation of "1" accounting for 90% and "0" accounting for 10%.

2. When the video signal is in the first state, the current controller sets the laser current to be a full current load, and the laser outputs a laser with a brightness of 100%. After being reflected by the digital micromirror assembly, 10% of the brightness is output as a video image, 90%. The brightness is reflected to the light absorber to generate heat. At this time, the video signal recognized by the video recognition module has a binary representation of "0" accounting for 90% and "1" accounting for 10%.

3. When the video signal is in the first state, the current controller sets the laser current to be part of the current load, and the laser outputs a laser with a brightness of 10%. After being reflected by the digital micromirror assembly, 1% of the brightness is output as a video image, 9%. The brightness is reflected to the light absorber to generate heat. At this time, the video signal recognized by the video recognition module has a binary representation of "0" accounting for 90% and "1" accounting for 10%.

Through the above three examples, when the video signal is in the second state, the laser works at full load to ensure high brightness of the video effect. When the video signal is in the first state, the laser works at 10% efficiency, ensuring that the useless heat of the heat is minimized. .

Adding dynamic adjustment of laser current before and after effect comparison:

视频信号处于第一状态The video signal is in the first state	视频亮度Video brightness	光吸收体发热量Light absorber heat	整机功耗Machine power consumption
降低激光电流到10％Reduce the laser current to 10%	1％1%	9％9%	10％10%

Does not reduce the laser current

10%

90%

100%

Through the laser brightness dynamic adjustment means, when the video is in the first state: the projector loses 10%-1%=9% of the video effect, but the heat absorption of the light absorber is reduced by 90%-9%=81%, The power consumption of the machine is reduced by 100%-10%=90%.

In summary, with the above control method, the projector can support higher laser brightness, and the overall effect of the projector is further improved.

7 is a flow chart of a projector-based control method according to a second embodiment of the present invention, wherein the projector includes a video recognition module, a current controller, a laser, a digital micromirror assembly, a light absorber, and a temperature sensor. As shown in FIG. 7, the flowchart shown in FIG. 7 is different from the flowchart shown in FIG. 6 in that it further includes the steps:

Step S201: The temperature on the light absorber is obtained by using a temperature sensor.

Step S202: The current controller is used to adjust the laser current according to the temperature.

In step S202, the step of adjusting the laser current according to the temperature by the current controller includes: the current controller determines whether the temperature exceeds a predetermined high temperature threshold; if the temperature exceeds the predetermined high temperature threshold, the current controller reduces the laser current according to the first predetermined rule.

In this embodiment, steps S201 to S202 and steps S101 to S102 are simultaneously executed in different threads.

8 is a flow chart of a projector-based control method according to a third embodiment of the present invention, wherein the projector includes a video recognition module, a current controller, a laser, a digital micromirror assembly, a light absorber, and an illumination sensor. As shown in FIG. 8, the flowchart shown in FIG. 8 is different from the flowchart shown in FIG. 6 in that it further includes the steps:

Step S301: Acquiring the light intensity on the light absorber by using the illumination sensor.

Step S302: The current controller is used to adjust the laser current according to the light intensity.

In step S302, the step of adjusting the laser current according to the illumination intensity by the current controller includes: the current controller determines whether the illumination intensity exceeds a predetermined high intensity threshold; if the illumination intensity exceeds the predetermined high intensity threshold, the current controller decreases according to the second predetermined rule. Laser current.

In the present embodiment, steps S301 to S302 and steps S101 to S102 are simultaneously executed in different threads.

9 is a flow chart of a projector-based control method according to a fourth embodiment of the present invention, wherein the projector includes a video recognition module, a current controller, a laser, a digital micromirror assembly, a light absorber, a temperature sensor, and an illumination sensor. As shown in FIG. 9, the flowchart shown in FIG. 9 is different from the flowchart shown in FIG. 6 in that it further includes the steps:

Step S401: The temperature on the light absorber is obtained by using a temperature sensor.

Step S402: Acquiring the light intensity on the light absorber by using the illumination sensor.

Step S403: The current controller is used to adjust the laser current according to the temperature and/or the light intensity.

In step S403, the operation of adjusting the laser current by the current controller temperature and/or the illumination intensity comprises: the current controller determines whether the temperature exceeds a predetermined high temperature threshold; if the temperature exceeds the predetermined high temperature threshold, the current controller reduces the laser current according to the first predetermined rule. Or the current controller determines whether the illumination intensity exceeds a predetermined high intensity threshold; if the illumination intensity exceeds a predetermined high intensity threshold, the current controller reduces the laser current according to a second predetermined rule; or the current controller determines whether the temperature exceeds a predetermined high temperature threshold and Whether the illumination intensity exceeds a predetermined high intensity threshold; if the temperature exceeds a predetermined high temperature threshold and the illumination intensity exceeds a predetermined high intensity threshold, the current controller reduces the laser current according to a third predetermined rule.

Specifically, the third predetermined rule may be to reduce the laser current to 0, that is, to turn off the laser, or to reduce the laser current to one-third of the current laser current, and the like.

In the present embodiment, steps S401 to S403 and steps S101 to S102 are simultaneously executed in different threads.

10 is a flowchart of a projector-based control method according to a fifth embodiment of the present invention, wherein the projector includes a video recognition module, a current controller, a laser, a digital micromirror assembly, a light absorber, a temperature sensor, and an illumination sensor. As shown in FIG. 10, the flowchart shown in FIG. 10 is different from the flowchart shown in FIG. 6 in that it further includes the steps:

Step S501: Acquire a temperature on the light absorber by using a temperature sensor.

Step S502: Acquiring the light intensity on the light absorber by using the illumination sensor.

Step S503: determining whether the temperature exceeds a predetermined high temperature threshold and/or whether the illumination intensity exceeds a predetermined high temperature threshold, and if so, executing at step S504, otherwise performing step S101.

In step S503, when the temperature exceeds the predetermined high temperature threshold, or the illumination intensity exceeds the predetermined high temperature threshold, or the temperature exceeds the predetermined high temperature threshold and the illumination intensity exceeds the predetermined high temperature threshold, step S504 is performed, otherwise step S101 is performed.

Step S504: The laser current is adjusted according to the temperature and/or the illumination intensity by the current controller, and the process proceeds to step S103.

In step S504, the operation of adjusting the laser current by the current controller temperature and/or the illumination intensity comprises: if the step S503 only determines whether the temperature exceeds the predetermined high temperature threshold, when the temperature exceeds the predetermined high temperature threshold, the current controller follows the first predetermined rule. Decrease the laser current; or, if step S503 only determines whether the illumination intensity exceeds a predetermined high intensity threshold, when the illumination intensity exceeds the predetermined high intensity threshold, the current controller reduces the laser current according to the second predetermined rule; or, if the step S503 simultaneously determines Whether the temperature exceeds the predetermined high temperature threshold and whether the illumination intensity exceeds the predetermined high intensity threshold, the current controller reduces the laser current according to the third predetermined rule when the temperature exceeds the predetermined high temperature threshold and the illumination intensity exceeds the predetermined high intensity threshold.

The invention has the beneficial effects that the invention receives and parses the video signal to obtain the light and dark state of the video signal, and then dynamically adjusts the laser current according to the light and dark state of the video signal, thereby controlling the laser brightness of the laser to be emitted according to the laser current and transmitting. laser. In the above manner, the present invention can ensure that the human eye perceives the video effect without changing the heat consumption of the projector and thereby reduces the overall temperature of the projector.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

A projector, comprising:

a video recognition module, configured to receive and parse a video signal to obtain a light and dark state of the video signal;

a power controller, configured to dynamically adjust laser power according to a brightness state of the video signal;

a laser for controlling a laser brightness of the laser to be emitted according to the laser power and emitting the laser light;

A digital micromirror assembly for receiving and reflecting the laser.
The projector of claim 1 wherein said projector further comprises:

a light absorber for absorbing the laser light reflected by the digital micromirror assembly;

a temperature sensor for obtaining a temperature on the light absorber;

Wherein, the power controller is further configured to adjust the laser power according to the temperature.
The projector of claim 1 wherein said projector further comprises:

a light absorber for absorbing the laser light reflected by the digital micromirror assembly;

a light sensor for obtaining light intensity on the light absorber;

Wherein, the power controller is further configured to adjust the laser power according to the illumination intensity.
The projector according to claim 1, wherein the operation of the video recognition module to receive and parse the video signal to obtain a light and dark state of the video signal comprises:

Obtaining a binary signal corresponding to the video signal, where the binary signal includes "0" and "1";

Obtaining a quantity ratio of the "0" in the binary signal;

Determining whether the quantity ratio is greater than a predetermined ratio;

Determining that the video signal is in a first state when the quantity ratio is greater than the predetermined ratio; and determining that the video signal is in a second state when the quantity ratio is less than or equal to the predetermined ratio.
The projector according to claim 4, wherein the operation of the power controller to dynamically adjust the laser power according to the light and dark state of the video signal comprises:

Adjusting the laser current to a full current load when the video signal is in the second state; and adjusting the quantity according to the quantity ratio of the "0" when the video signal is in the first state The laser current is part of the current load.
The projector according to claim 5, wherein said full current load is 100%, and said partial current load is 1/(X+20%)^12, wherein X is said "0" The quantity ratio.
The projector according to claim 2, wherein the operation of the power controller to adjust the laser power according to the temperature comprises:

The power controller determines whether the temperature exceeds a predetermined high temperature threshold;

The power controller reduces the laser power according to a first predetermined rule if the temperature exceeds the predetermined high temperature threshold.
The projector according to claim 3, wherein the operation of the power controller to adjust the laser power according to the illumination intensity comprises:

The power controller determines whether the illumination intensity exceeds a predetermined high intensity threshold;

The power controller reduces the laser power according to a second predetermined rule if the illumination intensity exceeds the predetermined high intensity threshold.
A projector-based control method, characterized in that the projector comprises a video recognition module, a power controller, a laser and a digital micro-mirror assembly, the method comprising:

Receiving and parsing a video signal by the video recognition module to obtain a light and dark state of the video signal;

Using the power controller to dynamically adjust the laser power according to the light and dark state of the video signal;

Using the laser to control the laser brightness of the laser to be emitted according to the laser power and to emit the laser;

The laser is received and reflected by the digital micromirror assembly.
The control method according to claim 9, wherein the projector further comprises a light absorber and a temperature sensor, the method further comprising:

Using the light absorber to absorb the laser light reflected by the digital micromirror assembly;

Acquiring the temperature on the light absorber by using the temperature sensor;

The laser power is adjusted according to the temperature by the power controller.
The control method according to claim 9, wherein the projector further comprises a light absorber and an illumination sensor, the method further comprising:

Using the light absorber to absorb the laser light reflected by the digital micromirror assembly;

Acquiring the light intensity on the light absorber by using the illumination sensor;

The laser power is adjusted according to the illumination intensity by the power controller.
The control method according to claim 9, wherein the step of receiving and parsing the video signal by the video recognition module to obtain a light and dark state of the video signal comprises:

Obtaining a binary signal corresponding to the video signal, where the binary signal includes "0" and "1";

Obtaining a quantity ratio of the "0" in the binary signal;

Determining whether the quantity ratio is greater than a predetermined ratio;

Determining that the video signal is in a first state when the quantity ratio is greater than the predetermined ratio; and determining that the video signal is in a second state when the quantity ratio is less than or equal to the predetermined ratio.
The control method according to claim 12, wherein the step of dynamically adjusting the laser power according to the light and dark state of the video signal by the power controller comprises:

Adjusting the laser current to a full current load when the video signal is in the second state; and adjusting the quantity according to the quantity ratio of the "0" when the video signal is in the first state The laser current is part of the current load.
The control method according to claim 13, wherein said full current load is 100%, and said partial current load is 1/(X+20%)^12, wherein X is said "0" The quantity ratio.
The control method according to claim 10, wherein the step of adjusting the laser power according to the temperature by using the power controller comprises:

Determining whether the temperature exceeds a predetermined high temperature threshold;

If the temperature exceeds the predetermined high temperature threshold, the laser power is decreased in accordance with a first predetermined rule.
The control method according to claim 11, wherein the step of adjusting the laser power according to the illumination intensity by using the power controller comprises:

Determining whether the illumination intensity exceeds a predetermined high intensity threshold;

If the illumination intensity exceeds the predetermined high intensity threshold, the laser power is decreased in accordance with a second predetermined rule.