CN112118429B - Display parameter adjusting method and device for laser projection television - Google Patents
Display parameter adjusting method and device for laser projection television Download PDFInfo
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- CN112118429B CN112118429B CN201910535311.0A CN201910535311A CN112118429B CN 112118429 B CN112118429 B CN 112118429B CN 201910535311 A CN201910535311 A CN 201910535311A CN 112118429 B CN112118429 B CN 112118429B
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- 238000000034 method Methods 0.000 title claims abstract description 73
- 238000001514 detection method Methods 0.000 claims abstract description 78
- 230000008569 process Effects 0.000 claims description 40
- 238000012545 processing Methods 0.000 claims description 21
- 238000010586 diagram Methods 0.000 description 24
- 230000006870 function Effects 0.000 description 17
- 230000006378 damage Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007781 pre-processing Methods 0.000 description 2
- 208000020564 Eye injury Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/44213—Monitoring of end-user related data
- H04N21/44218—Detecting physical presence or behaviour of the user, e.g. using sensors to detect if the user is leaving the room or changes his face expression during a TV program
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
- H04N21/4432—Powering on the client, e.g. bootstrap loading using setup parameters being stored locally or received from the server
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
Abstract
The invention provides a method and a device for adjusting display parameters of a laser projection television, when a multimedia unit of the laser projection television receives detection information sent by an eye protection unit, and when an application layer of a multimedia main control chip is not started, the received detection information can be processed through a driving layer of the multimedia main control chip. After the detection information is used for determining that the human body is detected within the preset range, the driving layer of the multimedia main control chip can further send indication information to the display driving unit to instruct the display driving unit to adjust the display parameters. The method and the device for adjusting the display parameters of the laser projection television can improve the safety performance of the laser projection television.
Description
Technical Field
The present invention relates to electronic technology, and more particularly, to a method and apparatus for adjusting display parameters of a laser projection television.
Background
With the development of electronic technology, more and more laser projection televisions gradually enter the market. The laser projection television adopts a laser light source as a display light source and is matched with a front projection display technology for imaging, and is provided with a special projection screen, so that the laser projection television can receive broadcast television programs or Internet television programs, and has the characteristics of bright color, high brightness, flexible placement and the like.
In the prior art, after a laser generator in a laser projection television emits a visible light laser beam, the visible light laser beam is directly projected onto a projection screen after being amplified, expanded, shaped and the like, so that people watch television program contents through the laser beam on the projection screen. Because the laser beam can cause injury to human eyes when directly irradiated to human eyes, some laser projection televisions are provided with human eye protection functions. Specifically, when the laser projection television detects a human body in a preset range of a picture projected by the laser projection television through a sensor of the laser projection television, a multimedia main control chip serving as a main control module in the multimedia unit sends indication information to a display driving chip, and the display driving chip is controlled to display prompt information on a screen so as to prompt a user to be far away from the screen; or when the human body is continuously detected within the preset range of the picture projected by the laser projection television, the display driving chip can also adjust the intensity of the laser beam emitted by the laser projection television, so that the damage of the laser beam emitted by the laser projection television to human eyes is reduced, and the safety performance of the laser projection television is improved.
However, in the prior art, in the starting process of the laser projection television, the laser generator, the color wheel and the DLP architecture for emitting the laser beam usually finish starting before the multimedia main control chip, so that the multimedia main control chip cannot provide the human eye protection function before the starting is not finished, and the safety performance of the laser projection television is further reduced.
Disclosure of Invention
The invention provides a method and a device for adjusting display parameters of a laser projection television, which can provide a human eye protection function when a multimedia main control chip is not started in the starting process of the laser projection television, so that the safety performance of the laser projection television is improved.
The first aspect of the present invention provides a method for adjusting display parameters of a laser projection television, which is applied to a multimedia main control chip for adjusting display parameters of the laser projection television, wherein the multimedia main control chip comprises a driving layer and an application layer, and the method comprises:
the multimedia main control chip acquires detection information; the detection information is used for indicating whether a human body is detected in a preset range of a picture projected by the laser projection television; when the application layer of the multimedia main control chip is not started, the driving layer of the multimedia main control chip determines whether a human body is detected in the preset range according to the indication information; if the human body is detected in the preset range, the driving layer of the multimedia main control chip sends indication information to the display driving unit of the laser projection television; the indication information is used for indicating the display driving unit to adjust display parameters.
A second aspect of the present invention provides a display parameter adjustment apparatus for a laser projection television, including:
an application layer and a drive layer; the driving layer includes:
the receiving module is used for acquiring detection information; the detection information is used for indicating whether a human body is detected in a preset range of a picture projected by the laser projection television;
the processing module is used for determining whether a human body is detected in the preset range according to the indication information when the application layer is not started;
the sending module is used for sending indication information to a display driving unit of the laser projection television if the human body is detected in the preset range; the indication information is used for indicating the display driving unit to adjust display parameters.
A third aspect of the present invention provides a laser projection television comprising a display parameter adjustment device of the laser projection television as described in any of the second aspects of the present application.
In summary, the present invention provides a method and an apparatus for adjusting display parameters of a laser projection television, which aim at the problem that an application layer of a multimedia main control chip in a multimedia unit is slow to start in a starting process of the laser projection television, so that a driving layer of the multimedia main control chip can process received detection information. Therefore, the multimedia unit can process the received detection information through the driving layer of the multimedia main control chip when receiving the detection information sent by the eye protection unit even if the application layer of the multimedia main control chip is not started at the moment. After the detection information is used for determining that the human body is detected within the preset range, the driving layer of the multimedia main control chip can further send indication information to the display driving unit to instruct the display driving unit to adjust the display parameters.
Therefore, the method and the device for adjusting the display parameters of the laser projection television can realize that the received detection information can be processed through the driving layer of the multimedia main control chip to provide a human eye protection function when the application layer of the multimedia main control chip is not started in the starting process of the laser projection television. Therefore, in the starting process of the laser projection television, after the light emitting equipment such as the light source unit and the like is started and the laser beam is projected to the projection screen, the application layer of the multimedia main control chip is not started completely, so that the human eye protection function cannot be provided. Thereby improving the safety performance of the laser projection television.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of a laser projection television used in the present application;
FIG. 2 is a diagram illustrating a multimedia unit processing detection information;
FIG. 3 is a flowchart illustrating an embodiment of a method for adjusting display parameters of a laser projection television according to the present application;
FIG. 4 is a schematic diagram of an embodiment of a laser projection television according to the present application;
fig. 5 is a schematic structural diagram of an embodiment of an eye protection unit in a laser projection television provided in the present application;
fig. 6 is a schematic structural diagram of an embodiment of a multimedia unit of a laser projection television according to the present application;
fig. 7 is a schematic structural diagram of an embodiment of a multimedia main control chip of a laser projection television provided in the present application;
fig. 8 is a schematic structural diagram of an embodiment of a multimedia host chip of a laser projection television provided in the present application;
FIG. 9 is a schematic diagram of an embodiment of a display parameter adjusting apparatus for a laser projection television according to the present application;
FIG. 10 is a schematic diagram illustrating an embodiment of a display parameter adjusting apparatus for a laser projection television according to the present application;
FIG. 11 is a schematic diagram illustrating an embodiment of a display parameter adjusting apparatus for a laser projection television according to the present application;
fig. 12 is a schematic structural diagram of a laser projection television provided in the present application.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of an embodiment of a laser projection television used in the present application. In a laser projection television 10 as shown in fig. 1:
the multimedia unit 11 is configured to process multimedia data in the laser projection television 10, specifically, the multimedia unit 11 may receive video data to be displayed through the interface 12, perform preprocessing such as transcoding and filtering on the video data, and then send the video data meeting the display standard of the laser projection television 10 to the display driving unit 13 for further display processing. Wherein the interface 12 includes, but is not limited to: a universal serial bus (Universal Serial Bus, abbreviated as USB) interface, a video graphics array (Video Graphics Array, abbreviated as VGA) interface, a digital video interface (Digital Visual Interface, abbreviated as DVI) interface, a high definition multimedia interface (High Definition Multimedia Interface, HDMI) interface, a network communication interface (e.g., a wireless fidelity (wireless fidelity, wi-Fi) communication interface, a fiber optic communication interface), etc. Alternatively, the multimedia unit 11 may also be referred to as a "multimedia board unit" in some specific implementations.
Subsequently, when the display driving unit 13 receives the video data transmitted from the multimedia unit 11, a control signal is transmitted to the light source driving unit 14 according to the video data, so that the light source driving unit 14 adjusts the display parameters of the light source unit according to the control signal. Optionally, in a specific implementation, the control signal sent by the display driving unit 13 to the light source driving unit 14 includes: the light source driving unit is controlled to display voltage signals R-PWM, G-PWM, B-PWM and Y-PWM of red light, green light, blue light and yellow light. Alternatively, the display driving unit may also be referred to as a "backlight control unit" in some specific implementations.
Finally, when the light source driving unit 14 receives the control signal sent by the display driving unit 13, the display parameters such as the intensity of the laser beam sent by the light source unit 15 are adjusted according to the control signal, so that the light source unit 15 projects the laser beam to the projection screen 16 according to the adjusted display parameters. Thus, a user of the laser projection television 10 may view video content presented by the laser light beam through the projection screen 16.
Further, since the visible light laser beam is emitted from the laser generator in the light source unit 15 of the laser projection television 10 and then is directly projected onto the projection screen 16 after being amplified, expanded, shaped, etc., people can watch video content directly through the laser beam on the projection screen 16. However, some laser projection televisions 10 are provided with eye protection to reduce human eye injury from the laser beam projected onto the projection screen 16 and meet the standard requirements for laser safety ratings in the GB8898 standard (e.g., the laser emission limits that can be used by laser systems are specified in the GB8898 standard 6.2.1 and 6.2.2) and appropriate measures are required to prevent user contact with more than specified laser radiation when the user is manually approaching the eye.
Specifically, as shown in FIG. 1, a sensor 17 may be disposed near the projection screen 16 of the laser projection television 10 for detecting a human body approaching the projection screen 16. The sensor 17 may be an infrared sensor, a distance sensor, or the like, and is configured to convert detected measured information into an electrical signal and send the electrical signal to the eye-protecting unit 18. The eye protection unit 18 amplifies, compares, etc. the electric signal transmitted from the sensor, generates detection information from the electric signal of the sensor, and transmits the detection information to the multimedia unit 11.
Subsequently, it is determined by the multimedia unit 11 whether or not a human body exists in a preset range in front of the projection screen 16, i.e., in front of an image projected by the laser projection television, based on the received detection information, and when a human body exists in the preset range, the multimedia unit 11 transmits instruction information to the display driving unit 13. The display driving unit 13 is caused to transmit a control signal to the light source driving unit 14 according to the received instruction information, so that the light source driving unit 14 adjusts the display parameters of the light source unit according to the control signal. For example, the display driving unit 13 may control the light source driving unit 14 to reduce the intensity of the laser beam projected onto the projection screen 16 by the light source unit 15 according to the instruction information, so as to reduce the damage of the human eyes in front of the projection screen 16 by the laser.
Specifically, in a specific implementation manner, when the multimedia unit 11 in the laser projection television 10 used in the present application determines whether a human body exists in a preset range of a picture projected by the laser projection television according to the detection information sent by the eye protection unit 18, and performs an eye protection function, a task program or task code stored in a main control chip in the multimedia unit 11 of the laser projection television 10 is generally executed.
For example, fig. 2 is a schematic diagram of processing detection information by a multimedia unit, in the schematic diagram shown in fig. 2, a master control chip in the multimedia unit 11 is denoted as a multimedia master control chip 110, and the chip includes at least the following layers from the network architecture: a guiding layer, a driving layer, a frame layer and an application layer. Alternatively, the multimedia host control chip 110 may also be referred to as a "multimedia host control module".
After the multimedia unit 11 receives the detection information, the application layer of the multimedia main control chip 110 determines whether a human body is detected in a preset range of a picture projected by the laser projection television according to the detection information. And when it is determined that the human body is detected within the preset range, the application layer of the multimedia main control chip 110 sends indication information to the display driving chip in the display driving unit 13, and the display driving chip is instructed to adjust the display parameters through the indication information.
Further, in the starting process of the laser projection television 10 shown in fig. 1, the starting sequence of the multimedia main control chip 110 in the multimedia unit 11 is shown by the dashed arrow in fig. 2, and when the guiding layer of the multimedia main control chip 110 is powered on, started or restarted, the guiding layer calls the relevant interface of the driving layer to start; the driving layer is used for directly interacting with the hardware, and after the driving layer is started, the data of the driving layer is transmitted to the application layer through the frame layer; wherein the framing layer may also be referred to as an intermediate layer in some implementations.
However, when the laser projection television 10 is started, the operating system mounted on the application layer of the highest layer of the multimedia main control chip 110 needs a long start time, for example, when the Android (Android) system is mounted on the application layer, the start time of the Android system needs about 40 seconds. The display driving unit 13, the light source driving unit 14, the light source unit 15, and other units for projecting the laser beam of the laser projection television 10 have simple logic during operation, and the starting time of the hardware is short, which is usually shorter than the starting time of the multimedia main control chip 110, for example, only about 10 seconds is needed.
Therefore, when the laser projection television 10 is started, after the units for projecting the laser beam, such as the display driving unit 13, the light source driving unit 14, and the light source unit 15, have been started and can emit the laser beam, the laser projection television 10 needs to wait for the starting of the multimedia main control chip 110 before the laser projection television 10 can work normally. However, in a period of time after the display driving unit 13, the light source driving unit 14, and the light source unit 15 have been started and before the multimedia main control chip 110 is successfully started, even if the multimedia main control chip 110 receives the detection information sent by the eye protection unit 18, it is impossible to process and implement the above-described eye protection function through its application layer.
In some laser projection televisions 10, after the display driving unit 13, the light source driving unit 14, and the light source unit 15 are started, some initial images may be displayed on the projection screen 16, for example: animation, manufacturer identification, driver identification, etc. In this way, the multimedia main control chip 110 cannot process the detection information sent by the eye protection unit and provide the eye protection function before the multimedia main control chip 110 is successfully started in the starting process of the laser projection television 10. Even if the sensor 17 detects that a human body approaches the projection screen 16, the multimedia main control chip 110 cannot process the detection information and send the indication information to control the display driving unit to adjust the display parameters, so that the display driving unit 13 cannot control the light source driving unit 14 to reduce the intensity of the laser beam projected onto the projection screen 16 by the light source unit 15, the damage of the human eyes in front of the projection screen 16 by the laser cannot be reduced, and the safety performance of the laser projection television 10 is further reduced.
In summary, the present application provides a method and an apparatus for adjusting display parameters of a laser projection television, so as to provide a human eye protection function when an application layer of a multimedia main control chip is not started in a startup process of the laser projection television, thereby improving safety performance of the laser projection television.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 3 is a flow chart of an embodiment of a method for adjusting display parameters of a laser projection television according to the present application, and fig. 4 is a structural diagram of an embodiment of a laser projection television according to the present application. The display parameter adjustment method of the laser projection television shown in fig. 3 may be performed by the multimedia unit 11 in the laser projection television shown in fig. 4, and includes:
s101: the multimedia main control chip acquires detection information.
Specifically, the laser projection television 10 provided in the present embodiment includes a sensor 17 and an eye protection unit 18 to realize a human eye protection function. Wherein the laser projection television 10 is provided with a sensor 17 for detecting a human body approaching the projection screen 16 within a preset range of a picture projected by the laser projection television 10. The sensor 17 converts the detected measured information into an electrical signal and transmits the electrical signal to the eye-protecting unit 18. The eye protection unit 18 amplifies, compares, etc. the electric signal transmitted from the sensor 17, generates detection information from the electric signal of the sensor, and transmits the detection information to the multimedia unit 11.
For example, if the sensor 17 detects that a human body exists in a preset range of the screen projected by the laser projection television 10, the eye-protecting unit 18 sends high-level signal detection information to the multimedia unit 11; if the sensor 17 does not detect the presence of a human body within a predetermined range in front of the screen projected by the laser projection television 10, the eye-protecting unit 18 transmits detection information of the low-level signal to the multimedia unit 11.
In S101 the multimedia unit 11 receives the detection information transmitted from the eye-protecting unit 18.
S102: when the application layer of the multimedia main control chip is not started, the driving layer of the multimedia main control chip determines whether a human body is detected in a preset range according to the indication information.
Subsequently, after the multimedia unit 11 receives the detection information, if the application layer of the multimedia main control chip 110 in the display control 11 unit is not started at this time, the driving layer of the multimedia main control chip 110 processes the detection information. The application layer is shown in fig. 4 in a state that it has not been started up by an application layer dashed line.
Alternatively, S102 is specifically executed by a task program or task code stored in the driver layer of the multimedia unit 11. The driving layer processes the detection information, including: whether a human body is detected within a preset range of a picture projected by the laser projection television 10 is determined according to the detection information. For example, if the driving layer of the multimedia unit 11 determines that the detection information is a low level signal, it is determined that a human body exists in a preset range of the picture projected by the laser projection television 10; if the driving layer of the multimedia unit 11 determines that the detection information is a high level signal, it is determined that no human body exists in the preset range of the picture projected by the laser projection television 10. The preset range may be a range of a picture that can be projected by a laser beam emitted from the laser projection television.
In one possible application scenario of the present embodiment, the method shown in fig. 3 is applied during the start-up of the laser projection television 10 shown in fig. 4. Since the activation speeds of the display driving unit 13, the light source driving unit 14, the light source unit 15, the sensor 17, and the eye-protecting unit 18 are greater than those of the multimedia unit 11. And for the multimedia main control chip 110 in the multimedia unit 11, the starting sequence is in accordance with the guiding layer, the driving layer, the frame layer and the application layer.
Therefore, in the present embodiment, when the display driving unit 13, the light source driving unit 14, the light source unit 15, the sensor 17 and the eye protection unit 18 are already started during the starting process of the laser projection television 10, and the driving layer of the multimedia main control chip 110 is started but the application layer is not yet started during the starting process, if the multimedia unit 11 receives the detection information sent by the eye protection unit 18 at this time, the driving layer already started in the multimedia main control chip 110 can process the detection information.
S103: if yes, the driving layer of the multimedia main control chip sends indication information to the display driving unit of the laser projection television.
Specifically, when the detection information is processed by the driving layer of the multimedia main control chip 110 in S103, if it is determined that the human body is detected within the preset range of the frame projected by the laser projection television 10 according to the detection information, the driving layer of the multimedia main control chip 110 further sends indication information to the display driving unit to instruct the display driving unit 13 to control the light source driving unit 14 to adjust the display parameters of the light source unit, so that the light source unit 15 projects the laser beam onto the projection screen 16 according to the adjusted display parameters.
Optionally, adjusting the display parameter described in the present embodiment includes: a prompt message is displayed on the projection screen 16, the brightness of the laser beam emitted from the light source unit 15 onto the projection screen 16 is reduced, or the light source unit 15 is controlled to stop emitting the laser beam onto the projection screen 16.
In summary, in the method for adjusting display parameters of a laser projection television provided in the present embodiment, the problem that the multimedia main control chip 110 in the multimedia unit 10 is started slowly during the starting process of the laser projection television is solved, so that the driving layer of the multimedia main control chip 110 can process the received detection information. Thus, the multimedia unit 10 can process the received detection information through the driving layer of the multimedia main control chip 110 when receiving the detection information sent by the eye protection unit even if the application layer of the multimedia main control chip 110 is not started at this time. After detecting the human body within the preset range according to the detection information, the driving layer of the multimedia main control chip 110 may further send indication information to the display driving unit 13 to instruct the display driving unit to adjust the display parameters.
Therefore, the display parameter adjustment method of the laser projection television provided by the embodiment can realize that the received detection information can be processed through the driving layer of the multimedia main control chip to provide a human eye protection function when the application layer of the multimedia main control chip is not started in the starting process of the laser projection television. Therefore, in the starting process of the laser projection television, after the light emitting equipment such as the light source unit and the like is started and the laser beam is projected to the projection screen, the application layer of the multimedia main control chip is not started completely, so that the human eye protection function cannot be provided. And further, the safety performance of the laser projection television is improved, so that the laser safety level of the laser projection television can meet the requirements of GB8898 standard.
Further, on the basis of the above embodiment, the following describes the working procedure of the laser projection television to which the above display parameter adjustment method is applied, in combination with a specific circuit logic diagram.
Specifically, fig. 5 is a schematic structural diagram of an embodiment of an eye protection unit in a laser projection television provided in the present application. As shown in fig. 5, the eye protection unit includes: an amplifying circuit, a comparing circuit and a logic circuit.
The sensor may be an infrared sensor, and is configured to receive a thermal infrared signal emitted by a human body within a preset range of a picture projected by the laser projection television, and convert the thermal infrared signal into an analog electrical signal. Outputting a high level signal to the ratio amplifying circuit when the sensor detects a human body; when the sensor does not detect a human body, the sensor outputs a low level signal to the amplifying circuit.
The amplifying circuit is used for amplifying the electric signal sent by the sensor. As the analog electric signal output by the sensor is weak, the analog electric signal is generally only in mV level, which is unfavorable for further processing of subsequent circuits. Therefore, the amplifying circuit provided in the present embodiment includes: an operational amplifier. The non-inverting input terminal (+) of the operational amplifier is connected with the sensor, and the inverting input terminal is connected with the output terminal through the resistor R.
The comparison circuit is used for distinguishing the analog electric signal amplified by the amplifying circuit. The comparison circuit comprises two comparators, wherein the two comparators respectively set two different high and low thresholds according to the characteristics of an analog electric signal generated by the sensor when the sensor detects a human body, the high threshold set by the comparator 1 is recorded as VREF_H, and the low threshold of the comparator 2 is recorded as VREF_L. When the maximum voltage value of the analog electric signal amplified by the amplifying circuit is larger than VREF_H, the comparator 1 outputs a high level to the logic circuit; when the minimum voltage value of the analog signal amplified by the amplifying circuit is smaller than vref_l, the comparator 2 outputs a high level to the logic circuit.
The logic circuit is used for carrying out logic OR operation on signals output by the comparator 1 and the comparator 2 in the comparison circuit, and outputting the obtained logic OR result as detection information to the multimedia unit. It can be understood that if the comparison circuit obtains that the detection result is that the human body is detected, the detection information output by the logic circuit is a low-level signal; if the detection result obtained by the comparison circuit is that the human body is not detected, the detection information output by the logic circuit is a high-level signal.
Fig. 6 is a schematic structural diagram of an embodiment of a multimedia unit of a laser projection television provided in the present application, and in the embodiment shown in fig. 6, a specific logic implementation manner of the multimedia unit and a flowchart of processing detection information by a multimedia main control chip are shown.
As shown in fig. 6, the multimedia unit 11 specifically includes: a multimedia main control chip 110, a logic control module 111 and a storage module 112. The multimedia main control chip 110 is a main control chip in the multimedia unit 11, the logic control module 111 is used for preprocessing detection information received by the multimedia unit 11, and the storage module is used for storing programs, codes, related data and the like required by the normal operation of the multimedia main control chip 110.
The detection signal is counted when the logic control module 111 in the multimedia unit 11 receives the detection signal transmitted by the amplifying circuit as shown in fig. 5. Wherein, because the logical OR operation result output by the logical circuit of the eye-protecting unit is a high level signal when the sensor does not detect the human body, the logical OR operation result output by the logical circuit of the eye-protecting unit generates a low level pulse signal when the sensor detects the human body. The logic control module 111 is configured to count the number of pulse signals in a unit time (for example, 1 second), and if the number of pulses received in the unit time is greater than a preset threshold, the logic control module 111 sends a signal a to the multimedia main control chip. The embodiment of the signal a is not limited, and for example, the signal a may be a high level signal.
In addition, the logic control module 111 in this embodiment further sets a signal B for detecting whether the eye protection unit works normally. For example, in one particular implementation, signal B may be a high signal when the eye-shield unit is operating properly; and when the eye-protecting unit does not operate normally, the signal B may be a low level signal.
When the driving layer of the multimedia main control chip 110 shown in fig. 6 is started, and the application layer is not started, the driving layer of the multimedia main control chip 110 may temporarily replace the application layer to process the signal a and the signal B sent by the logic control module 111. For example, when the driving layer receives the high-level signal a, that is, it is determined that the sensor detects the human body within the preset range according to the signal a, the driving layer further sends indication information to the logic control module of the display driving unit 13 according to the signal a, so as to instruct the display driving unit 13 to adjust the display parameters.
Optionally, in this embodiment, the driving layer of the multimedia main control chip 110 sends the indication information to the logic control module 131 through the I2C interface between the multimedia unit 11 and the display driving unit 13.
Subsequently, after receiving the indication information, the logic control module 131 can inform the display driving chip 130 according to the indication information, and adjust the control signals of R-PWM, G-PWM, B-PWM and Y-PWM sent to the light source driving unit 14, so as to realize the reduction of the intensity of the laser beam projected by the light source unit 15 to the projection screen 16 by controlling the light source driving unit 14, or turn off the laser beam projected by the light source unit to the projection screen 16.
Further, since the embodiment shown in fig. 6 can be applied to the multimedia master control chip 110 in the starting process, the driving layer of the multimedia master control chip 110 can temporarily replace the application layer to process the signal a and the signal B sent by the logic control module 111 when the driving layer is already started and the application layer is not started. When the multimedia main control chip 110 starts according to the starting sequence, and the application layer is started, if the logic control module 111 of the multimedia unit 11 receives the detection information sent by the eye protection unit 18 again and sends the signal a and the signal B to the multimedia main control chip 110 according to the detection information, the application layer in the started multimedia main control chip 110 processes the signal a and the signal B sent by the logic control module 111.
For example, fig. 7 is a schematic structural diagram of an embodiment of a multimedia host chip of a laser projection television provided in the present application; fig. 7 is a schematic flow chart of a specific logic implementation manner and a processing of detection information by the multimedia main control chip after the application layer of the multimedia unit is started. The flow except for the application layer processing signals a and B in the multimedia host chip 110 is the same as the example shown in fig. 6, and will not be repeated.
Therefore, the embodiments shown in fig. 6 and fig. 7 can be applied to the same laser projection television, that is, when the laser projection television is started, if the driving layer of the multimedia main control chip is started and the application layer is not started, the driving layer processes the detection information received by the multimedia unit; and after the application layer of the multimedia main control chip is started, the application layer processes the detection information received by the multimedia unit.
In order to achieve the above embodiments, the present application further provides a method for performing function handover between an application layer and a driving layer in a multimedia main control chip, so as to implement switching between functions of processing detection information by the driving layer or the application layer in the multimedia main control chip.
Specifically, fig. 8 is a schematic structural diagram of an embodiment of a multimedia host chip of a laser projection television provided in the present application, where an application layer and a driving layer of the multimedia host chip 110 can access the memory module 112. Therefore, in the storage module, a variable that can be accessed by both the application layer and the driving layer may be set, where the variable value is, for example, "0" when the application layer has not completed starting during the starting process of the laser projection television, and the variable value is used to indicate that the application layer has not been started. The driving layer of the multimedia main control chip 110 accesses the variable set in the storage module 112 after receiving the signal a and the signal B sent by the logic control module 111, and if the variable value is "0", the driving layer further processes the signal a and the signal B.
Then, after the application layer of the multimedia main control chip 110 is started, the application layer sets the variable value stored in the storage module 112 to "1", where the variable value is used to indicate that the application layer is started. At this time, if the multimedia main control chip 110 receives the signal a and the signal B sent by the logic control module, the application layer of the multimedia main control chip 110 may directly further process the signal a and the signal B; the driving layer of the multimedia main control chip 110 does not further process the signal a and the signal B according to the variable value of "1" in the memory module 112.
In the embodiments provided in the present application, the method provided in the present application is described and illustrated, and in order to implement each function in the method provided in the embodiment of the present application, the laser projection television may further include a hardware structure and/or a software module, where each function is implemented in a form of a hardware structure, a software module, or a hardware structure and a software module. Some of the functions described above are performed in a hardware configuration, a software module, or a combination of hardware and software modules, depending on the specific application of the solution and design constraints.
For example, fig. 9 is a schematic structural diagram of an embodiment of a display parameter adjustment device for a laser projection television provided in the present application, where the device 80 may be used to perform a method performed by a multimedia host chip as described in any one of fig. 3 to 8, and the device 80 specifically includes: a driver layer 81 and an application layer 82.
Fig. 10 is a schematic structural diagram of an embodiment of a display parameter adjusting device of a laser projection television provided in the present application. As shown in fig. 10, the driving layer 81 of the device 80 further includes: a receiving module 811, a processing module 812 and a transmitting module 813. Wherein, the receiving module 811 is configured to obtain detection information; the detection information is used for indicating whether a human body is detected in a preset range of a picture projected by the laser projection television; a processing module 812, configured to determine whether a human body is detected within the preset range according to the indication information when the application layer 82 is not started; the sending module 813 is configured to send indication information to a display driving chip of the laser projection television if it is determined that a human body is detected within the preset range; the indication information is used for indicating the display driving chip to adjust display parameters.
Optionally, based on the foregoing embodiment, the processing module 812 is specifically configured to determine, when the driving layer 81 of the display chip is started and the application layer 82 of the display chip is not started during the starting process of the laser projection television, whether a human body is detected within the preset range according to the indication information.
Optionally, the processing module 813 is further configured to determine whether the application layer 82 of the multimedia host control chip is started.
Optionally, the processing module 813 is further configured to determine, according to the identification information stored in the multimedia master control chip, whether the application layer 82 of the multimedia master control chip is started; when the application layer 82 of the multimedia main control chip is started, the application layer 82 of the multimedia main control chip sets the identification information to be started.
Further, on the basis of the embodiments of fig. 9 and fig. 10, fig. 11 is a schematic structural diagram of an embodiment of a display parameter adjusting device of a laser projection television provided in the present application, as shown in fig. 11, an application layer 82 of the device 80 further includes: a receiving module 821, a processing module 822, and a transmitting module 823. The receiving module 821 is specifically configured to obtain detection information; the detection information is used for indicating whether a human body is detected in a preset range of a picture projected by the laser projection television; the processing module 822 is specifically configured to determine whether a human body is detected within the preset range according to the indication information when the application layer 82 of the multimedia main control chip is started; the sending module 823 is used for sending indication information to a display driving chip of the laser projection television if a human body is detected in a preset range; the indication information is used for indicating the display driving chip to adjust the display parameters.
The division of the modules in the embodiments of the present application is merely illustrative, and there may be another division manner in actual implementation, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, or may exist alone physically, or two or more modules may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules.
Further, fig. 12 is a schematic structural diagram of a laser projection television provided in the present application, and as shown in fig. 12, the present embodiment further provides a laser projection television 11, including a display parameter adjustment device 1101 of the laser projection television according to any of the foregoing embodiments of the present application.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (11)
1. The display parameter adjusting method of the laser projection television is characterized in that a multimedia main control chip applied to a multimedia unit adjusts the display parameter of the laser projection television, wherein the multimedia main control chip comprises a driving layer and an application layer, and the method comprises the following steps:
the multimedia main control chip acquires detection information; the detection information is used for indicating whether a human body is detected in a preset range of a projected picture of the laser projection television;
when the application layer of the multimedia main control chip is not started, the driving layer of the multimedia main control chip determines whether a human body is detected in the preset range according to the detection information;
if the human body is detected in the preset range, the driving layer of the multimedia main control chip sends indication information to the display driving unit of the laser projection television; the indication information is used for indicating the display driving unit to adjust display parameters.
2. The method of claim 1, wherein the determining, by the driver layer of the multimedia host chip according to the detection information, whether a human body is detected within the preset range when the application layer of the multimedia host chip is not started, comprises:
in the starting process of the laser projection television, when the driving layer of the multimedia main control chip is started and the application layer of the multimedia main control chip is not started,
and the driving layer of the multimedia main control chip determines whether a human body is detected in the preset range according to the detection information.
3. The method of claim 1, wherein after the multimedia master control chip obtains the detection information, further comprising:
the driving layer of the multimedia main control chip determines whether the application layer of the multimedia main control chip is started.
4. The method of claim 3, wherein the driving layer of the multimedia host chip determining whether an application layer of the multimedia host chip has been started comprises:
the driving layer of the multimedia main control chip determines whether the application layer of the multimedia main control chip is started or not through the identification information;
after the application layer of the multimedia main control chip is started, the application layer of the multimedia main control chip sets the identification information to be started.
5. The method according to any one of claims 1-4, wherein after the multimedia master control chip obtains the detection information, further comprising:
when the application layer of the multimedia main control chip is started, the application layer of the multimedia main control chip determines whether a human body is detected in the preset range according to the detection information;
if the human body is detected in the preset range, the application layer of the multimedia main control chip sends indication information to the display driving unit of the laser projection television; the indication information is used for indicating the display driving unit to adjust display parameters.
6. A display parameter adjusting apparatus for a laser projection television, comprising: an application layer and a drive layer;
the driving layer includes:
the receiving module is used for acquiring detection information; the detection information is used for indicating whether a human body is detected in a preset range of a projected picture of the laser projection television;
the processing module is used for determining whether a human body is detected in the preset range according to the detection information when the application layer is not started;
the sending module is used for sending indication information to a display driving unit of the laser projection television if the human body is detected in the preset range; the indication information is used for indicating the display driving unit to adjust display parameters.
7. The apparatus of claim 6, wherein the processing module is configured to,
and in the starting process of the laser projection television, when the driving layer is started and the application layer is not started, determining whether a human body is detected in the preset range according to the detection information.
8. The apparatus of claim 6, wherein the processing module is further configured to,
it is determined whether the application layer has been started.
9. The apparatus of claim 8, wherein the processing module is configured to,
determining whether the application layer is started or not through the identification information; and after the application layer is started, the application layer sets the identification information to be started.
10. The device according to any one of claims 6 to 9, wherein,
the application layer comprises:
the receiving module is used for acquiring detection information; the detection information is used for indicating whether a human body is detected in a preset range of a projected picture of the laser projection television;
the processing module is used for determining whether a human body is detected in the preset range according to the detection information when the application layer is started;
the sending module is used for sending indication information to a display driving unit of the laser projection television if the human body is detected in the preset range; the indication information is used for indicating the display driving unit to adjust display parameters.
11. A laser projection television, comprising: a display parameter adjusting apparatus of a laser projection television as claimed in any one of claims 6 to 10.
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