CN109327735B - Display method and display device - Google Patents
Display method and display device Download PDFInfo
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- CN109327735B CN109327735B CN201811044982.9A CN201811044982A CN109327735B CN 109327735 B CN109327735 B CN 109327735B CN 201811044982 A CN201811044982 A CN 201811044982A CN 109327735 B CN109327735 B CN 109327735B
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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
- H04N21/47—End-user applications
- H04N21/485—End-user interface for client configuration
- H04N21/4854—End-user interface for client configuration for modifying image parameters, e.g. image brightness, contrast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
- H04N5/202—Gamma control
Abstract
The invention relates to a display method of a display, which comprises the following steps: acquiring face identification information to be identified; judging whether the target face identification information exists in the face identification information, if so, starting a vision protection display process; the eyesight protection display process comprises the following steps: detecting the existence time of target face identification information; and controlling the brightness of the display picture according to the existence time. According to the display method, the face detection and recognition are combined with the eyesight protection display process, the face of the target (child) is effectively recognized, and the brightness of the display picture is controlled in the process of the existence of the target face recognition information, so that the eyesight of the target is effectively protected.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display method and a display device.
Background
The traditional television is provided with a parent monitoring function and a timing switch function, and the time that children spend watching the television can be restricted through the parent monitoring function and the timing switch function, so that the eyesight of the children is protected.
However, the monitoring function of the parents requires the parents to spend a certain effort, so that the monitoring efficiency is low; the time that children spend watching the television is restricted by the timing switch function is always rigid, if adults watch the television, the television can only be restarted after being automatically turned off, and the inconvenience in watching is brought. Importantly, when an adult and a child watch the television together, the television is not suitable for the eyes of the child due to high brightness of the television, and the eyes of the child are easily damaged. Therefore, merely reducing the time for the child to watch the television does not effectively reduce the damage of the television to the eyes of the child.
Disclosure of Invention
Accordingly, there is a need for a display method and a display device that can effectively protect the eyesight of children.
A display method of a display, comprising:
acquiring face identification information to be identified;
judging whether the target face identification information exists in the face identification information, if so, starting a vision protection display process;
the eyesight protection display process comprises the following steps:
detecting the existence time of the target face recognition information;
and controlling the brightness of the display picture according to the existence time.
In one embodiment, the step of acquiring the face recognition information to be recognized and determining whether target face recognition information exists in the face recognition information includes:
collecting a face image to be recognized;
acquiring feature information in the face image as face identification information;
and comparing the face identification information with preset target face identification information, and judging whether the target face identification information exists in the face identification information.
In one embodiment, the step of controlling the brightness of the display screen according to the existence time comprises the following steps:
setting a first preset time and a second preset time, wherein the second preset time is greater than the first preset time;
judging whether the existing time is greater than the first preset time, if so, controlling the brightness of the display picture to be in a preset brightness range;
judging whether the existing time is greater than the first preset time and less than the second preset time, if so, keeping the brightness of the display picture in a preset brightness range;
and judging whether the existing time is greater than the second preset time, if so, stopping outputting the display picture.
In one embodiment, the step of controlling the brightness of the display frame to be in a preset brightness range includes:
acquiring a backlight control signal corresponding to a display picture;
controlling backlight driving current according to the backlight control signal;
and controlling the brightness of the display picture to be in a preset brightness range according to the backlight driving current.
In one embodiment, the step of controlling the brightness of the display frame to be in a preset brightness range includes:
acquiring a gamma control signal corresponding to a display picture;
controlling a gamma voltage according to the gamma control signal;
and controlling the brightness of the display picture to be in a preset brightness range according to the gamma voltage.
In one embodiment, the step of controlling the brightness of the display frame to be in a preset brightness range includes:
acquiring a gray scale control signal corresponding to a display picture;
controlling the gray scale value displayed by the picture according to the gray scale control signal;
and controlling the brightness of the display picture to be in a preset brightness range according to the gray-scale value.
In one embodiment, after the step of stopping outputting the display screen, the method further includes:
detecting the duration of stopping outputting the display picture;
judging whether the duration time is greater than a third preset time, if so, starting a channel for outputting a display picture;
otherwise, closing the channel for outputting the display picture.
A display device of a display, comprising:
the acquisition module is used for acquiring face identification information to be identified;
the recognition module is used for judging whether the target face recognition information exists in the face recognition information or not;
the detection module is used for detecting the existence time of the target face recognition information; and
and the control module is used for controlling the brightness of the display picture according to the existence time.
In one embodiment, the control module comprises:
the device comprises a setting unit, a processing unit and a control unit, wherein the setting unit is used for setting first preset time and second preset time, and the second preset time is greater than the first preset time;
the judging unit is used for judging whether the existence time is greater than the first preset time, judging whether the existence time is greater than the first preset time and less than the second preset time, and judging whether the existence time is greater than the second preset time; and
the adjusting unit is used for controlling the brightness of the display picture to be in a preset brightness range when the existence time is longer than a first preset time; when the existing time is longer than the first preset time and shorter than the second preset time, keeping the brightness of the display picture in a preset brightness range; and when the existing time is longer than the second preset time, stopping outputting the display picture.
In one embodiment, the adjusting unit includes:
the backlight control subunit is used for acquiring a backlight control signal of a display picture, controlling a backlight driving current according to the backlight control signal, and controlling the brightness of the display picture to be within a preset brightness range according to the backlight driving current;
the gamma voltage control subunit is used for acquiring a gamma control signal corresponding to a display picture, controlling a gamma voltage according to the gamma control signal, and controlling the brightness of the display picture to be within a preset brightness range according to the gamma voltage; and
the gray scale control subunit is used for acquiring a gray scale control signal corresponding to a display picture, controlling a gray scale value displayed by the picture according to the gray scale control signal, and controlling the brightness of the display picture to be within a preset brightness range according to the gray scale value.
According to the display method, the face detection and recognition are combined with the eyesight protection display process, the face of the target (child) is effectively recognized, and the brightness of the display picture is controlled in the process of the existence of the target face recognition information, so that the eyesight of the target is effectively protected.
Drawings
FIG. 1 is a flowchart illustrating a display method of a display according to an embodiment;
FIG. 2 is a flowchart of one implementation of steps S100 and S200 of FIG. 1;
FIG. 3 is a flowchart of one implementation of step S400 in FIG. 1;
FIG. 4 is a flowchart of one implementation of step S430 in FIG. 3;
FIG. 5 is a flowchart of another implementation of step S430 in FIG. 3;
FIG. 6 is a flowchart of a further method of step S430 in FIG. 3;
fig. 7 is a flowchart of steps subsequent to step S470 in fig. 3;
FIG. 8 is a block diagram of a display device of a display according to an embodiment;
FIG. 9 is a schematic diagram of an embodiment of the control module 400 of FIG. 8;
fig. 10 is a schematic structural diagram of the adjusting unit 430 in fig. 9;
FIG. 11 is a schematic diagram of an architecture of the gamma voltage control subunit 432 in FIG. 10;
FIG. 12 is a schematic diagram of a gray level control subunit 433 in FIG. 10.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
FIG. 1 is a flowchart illustrating a display method of a display according to an embodiment. The method includes the following steps S100 to S400.
Step S100: and acquiring the face identification information to be identified. The color temperature and brightness of the display images suitable for adults and children are different, so that the display images suitable for adultsThe color temperature and brightness of (2) are higher than those of children. For example, adult adapted color temperature range 5500K-6500K (K, Kelvin temperature unit), average brightness of 100cd/m2-200cd/m2(cd/m2Candela brightness units); the color temperature range of the children is 4000K-4300K, and the average brightness is 85cd/m2Left and right. Therefore, before the display outputs the display color temperature and the brightness, the face recognition information to be recognized is acquired first, and then the determination process of step S200 is performed to perform different processing according to different situations.
Step S200: judging whether the target face identification information exists in the face identification information, if so, starting a vision protection display process including the steps S300-S400; otherwise, starting the display to work normally. If the target face identification information exists in the face identification information, namely children exist in the watched crowd, the eyesight protection display is carried out on the display, and the eyesight of the children is protected. The step can be executed for multiple times so as to monitor the watching crowd in real time and ensure the accuracy of the judgment result.
Step S300: and detecting the existence time of the target face recognition information. When the target face recognition information is judged to exist (namely, children exist), the display starts a timing program, and the timing program detects the existence time of the target face recognition information. Wherein the time of existence is the viewing time of the child in front of the display.
Step S400: and controlling the brightness of the display picture according to the existence time. The existence time is used for judging whether the child is attentive to watch the display picture and whether the preset watching time is exceeded. If the child is determined to be attentive to view the display, reducing the brightness output of the display; and if the time for the child to watch the display picture is determined to exceed the preset watching time, stopping outputting the display picture.
According to the display method of the display, the face detection and recognition are combined with the vision protection display process, the face of the target (child) is effectively recognized, and the brightness of the display picture is controlled in the process of the existence of the target face recognition information, so that the vision of the target is effectively protected.
In one embodiment, as shown in fig. 2, step S100 and step S200 specifically include:
step S110: and collecting a face image to be recognized. Specifically, a camera may be mounted at one side edge of a display (television). For example, a camera is installed below the display for capturing the face image of the viewer in front of the display.
Step S120: and acquiring characteristic information in the face image as face identification information. Specifically, feature information for identifying different viewers is acquired from a face image. The feature information includes geometric feature information of the human face, such as shapes of eyes, nose, mouth, etc., and geometric relationships therebetween (e.g., distances from each other). In addition, the feature information also comprises additional features such as the fineness of skin and the thickness of hair, and the additional features are used for assisting in distinguishing the human faces with higher similarity.
Step S130: and comparing the face identification information with preset target face identification information, and judging whether the target face identification information exists in the face identification information. The preset target face recognition information is characteristic information of the face of the child. Specifically, a standard value of the feature information of the child face may be pre-stored in the display, and then the standard value is compared with the sampling value of the acquired feature information (face recognition information), and if the standard value matches with a part of the sampling value, it is determined that the acquired feature information has the feature information of the child face. That is, the target face recognition information exists in the face recognition information.
For example, when the feature information is human face geometric feature information, the sizes of eyes, noses and mouths of children and the distances between the eyes, the noses and the mouths are generally smaller than those of adults. Therefore, a database is established in the display in advance, the size parameters of eyes, noses, mouths and the like and the distance parameters between the size parameters and the distance parameters are recorded, and a standard value is set (the standard value can be an average value of the recorded corresponding parameters of a plurality of children). And when the sampling value of the acquired characteristic information is less than or equal to the standard value, determining that the child exists in the viewer.
In one embodiment, as shown in fig. 3, the step of S400 includes:
step S410: setting first preset time and second preset time, wherein the second preset time is greater than the first preset time.
Specifically, the first preset time is set to T1, and is mainly used to determine whether the child focuses on watching a display screen (e.g., a display screen played by a television) output by the display. When the time that the child is looking in front of the display exceeds T1, it can be determined that the child is looking at attentiveness.
Specifically, the second preset time is set as T2, and is mainly used for measuring the watching time of the child. When the watching time of the child in front of the display exceeds T2, the watching time of the child is determined to exceed the preset standard time.
Step S420: judging whether the existing time is greater than a first preset time, if so, executing a step S430; otherwise, normal output of the display screen is controlled, and the step S300 is executed (i.e., the existence time of the target face recognition information is detected).
Specifically, the existence time is labeled as T0, and the existence time T0 is the existence time of the target face recognition information detected in step S300. The target face is a child face. The display can only acquire the child face recognition information when the child is watching in front of the display, and the existence time T0 of the child face recognition information is detected. The presence time T0 reflects the viewing time of the child. When the existing time T0 is greater than the first preset time T1, it indicates that the child is in attentive view, and then step S430 can be executed; when the existence time T0 is less than the first preset time T1, it indicates that the child is not watching for concentration, and then the process returns to step S300 to continue detecting the existence time of the child face recognition information.
Step S430: and controlling the brightness of the display frame to be in a preset brightness range.
Specifically, the preset brightness range is a brightness range suitable for children to watch. For example, the predetermined luminance range may be 80cd/m2To 90cd/m2。
Step S440: and judging whether the existing time is greater than the first preset time and less than the second preset time, if so, executing the step S450.
In this step, when the existing time T0 is greater than the first preset time T1, it indicates that the child is watching in a focused manner; when the existing time T0 exceeds the first preset time T1 but does not reach the second preset time T2, i.e., during the period from T1 to T0, it is determined that the child is in the attentive viewing state.
Step S450: and keeping the brightness of the display picture in a preset brightness range. The preset brightness range is lower than the brightness of the display during normal display so as to protect the eyesight of the child.
Step S460: and judging whether the existing time is greater than the second preset time, if so, executing the step S470.
In this step, when the existing time T0 exceeds the second preset time T2, it indicates that the viewing duration of the child has exceeded the standard viewing duration (the viewing duration suitable for the child, if the standard viewing duration is exceeded, the eyes of the child are easily damaged), and then step S470 or manual control may be performed. Wherein, for the mode of manual control includes: the display outputs a prompt instruction that the existing time T0 has exceeded a second preset time T2; and manually selecting to close the picture or continue playing according to the instruction.
Step S470: the output of the display screen is stopped.
Specifically, the stopping of the output of the display screen may be turning off the power of the display.
In one embodiment, as shown in fig. 4, the specific implementation step of step S430 includes:
step S431: and acquiring a backlight control signal corresponding to the display picture.
Step S432: the backlight driving current is controlled according to the backlight control signal.
Step S433: and controlling the brightness of the display picture to be in a preset brightness range according to the backlight driving current.
In this embodiment, a backlight control Chip is built in the display, and the backlight control Chip obtains a backlight control signal corresponding to a display screen, where the backlight control signal is provided by a System-On-Chip (SOC) of the display. The SOC is a micro system and is used for carrying out face recognition judgment, judging and confirming whether children are attentively watching according to the face recognition, and outputting a backlight control signal to the backlight control chip according to a judgment result. When it is judged that a child is attentively watching, the duty (percentage of positive values in one period of the signal) of the backlight control signal output by the SOC is reduced, and the backlight driving current output by the backlight control chip is also reduced, so that the brightness of the display picture is correspondingly darkened. It can be understood that different duty of the backlight control signal corresponds to different backlight driving current (changing duty of the backlight control signal can adjust duty ratio of high pulse/low pulse in backlight driving current pulse), and different backlight driving current corresponds to different brightness value, so the SOC can make the brightness of the display frame in the preset brightness range by controlling duty of the output backlight control signal.
Optionally, the backlight control signal is a square wave signal.
In another embodiment, as shown in fig. 5, the specific implementation step of step S430 may include:
step S431': acquiring a gamma control signal corresponding to a display picture;
step S432': controlling a gamma voltage according to a gamma control signal;
step S433': controlling the brightness of the display frame within a preset brightness range according to the gamma voltage
In this embodiment, a gamma (gamma) voltage control chip is built in the display, and the gamma voltage control chip obtains a gamma control signal corresponding to a display screen, where the gamma control signal is provided by the SOC of the display. Specifically, 2 areas for storing gamma codes are arranged in the gamma voltage control chip, wherein one area stores brighter gamma codes for controlling the display picture to display normally, and the other area stores darker gamma codes for controlling the display picture to display at darker brightness. It can be understood that when the SOC determines that the child is attentively watching, the gamma control signal output by the SOC starts the area storing the darker gamma code (obtains the gamma control signal corresponding to the display screen), and the darker gamma code converts the digital signal into the analog voltage output through the analog-to-digital converter (controls the gamma voltage output according to the gamma control signal)And voltage), controlling the brightness of the display picture to be in a preset brightness range according to the analog voltage (gamma voltage). Furthermore, the darker gamma code is converted into a lower gamma voltage, and the lower gamma voltage controls the display to output a darker display picture. Therefore, the range of luminance (e.g., 80 cd/m) can be adjusted according to the children2To 90cd/m2) And setting a corresponding gamma code to be stored in a darker gamma code area, so that the brightness of a display picture can be controlled to be in a preset range by selecting the gamma code in the area.
Optionally, the analog-to-digital converter may further include a resistor string, and the gamma voltage is further accurately adjusted by adjusting the resistance of each resistor in the resistor string.
In another embodiment, as shown in fig. 6, the specific implementation step of step S430 may further include:
step S431 ": acquiring a gray scale control signal corresponding to a display picture;
step S432 ″: controlling the gray scale value displayed by the picture according to the gray scale control signal;
step S433 ": and controlling the brightness of the display picture to be in a preset brightness range according to the gray-scale value.
In this embodiment, a TCON (Timer Control) chip is built in the display, and the TCON chip obtains a gray scale Control signal corresponding to a display frame, where the gray scale Control signal is provided by an SOC of the display. Specifically, a gray scale reduction algorithm module is built in the TCON chip. The gray scale reduction algorithm is used to reduce the input image gray scale value, for example, the input image gray scale value is 255, and then the output image gray scale value becomes 230 or lower after the gray scale reduction algorithm. It can be understood that when the SOC determines that a child is attentively watching, the SOC outputs a gray scale control signal to the TCON chip, and the TCON chip cuts off a normal display path of the picture data input signal (including a luminance signal of an image), and performs gray scale reduction processing on the picture data input signal by using the gray scale reduction algorithm module, and then outputs a display picture with a preset luminance range through time sequence processing.
Alternatively, the gray scale reduction algorithm may be implemented using a look-up table. The method is characterized in that the gray-scale value calculated by the gray-scale reduction algorithm is stored in a table (namely a memory) in advance, when the gray-scale value of a certain picture is input, the table stores the only corresponding gray-scale value, and the operation process of the gray-scale reduction algorithm is the process of extracting the corresponding gray-scale value from the table, so that the operation speed of the gray-scale reduction algorithm is greatly improved by adopting a table look-up method, the brightness of the displayed picture is converted quickly, and the retention effect is avoided.
In one embodiment, as shown in fig. 7, the steps after step S470 include:
step S480: the duration of the stop of the output of the display screen is detected. Specifically, after the display is powered off, the internal timer program still counts again to record the duration τ of the stop of outputting the display frame.
Step S490: and judging whether the duration time is greater than a third preset time, if so, executing a step S500a, otherwise, executing a step S500 b. The third preset time is T3, and the time is the time when the display is not displayable after the output of the display screen is stopped.
Step S500 a: and opening a channel for outputting a display picture.
Step S500 b: and closing the channel for outputting the display picture.
In this embodiment, after the output of the display screen is stopped, the display automatically detects the duration τ of the stop of the output of the display screen. When the tau is greater than the third preset time T3, a channel of the display for outputting the display picture is opened, namely the display is in a state of allowing the display picture to be output; when the duration τ is less than the third preset time T3, the channel of the display outputting the display screen is closed, i.e., the display is in a state of prohibiting the output of the display screen. Wherein the third preset time T3 is set as a time after the display stops outputting the display picture, and the time is used for limiting the child to turn on the display again. Specifically, the third preset time T3 may be set according to the recovery time of the eyes of the child after focusing on the viewing, and is not particularly limited herein.
Fig. 8 is a schematic diagram of a display device module of a display according to an embodiment, the display device including:
the acquiring module 100 is configured to acquire face recognition information to be recognized.
Specifically, the acquisition module 100 includes a camera. Wherein the camera is mounted on one side edge of the display (television). For example, a camera is installed below the display to collect a face image of a viewer in front of the display, and feature information for identifying different viewers is obtained from the face image. The feature information includes geometric feature information of the human face, such as shapes of eyes, nose, mouth, etc., and geometric relationships therebetween (e.g., distances from each other). In addition, the feature information also comprises additional features such as the fineness of skin and the thickness of hair, and the additional features are used for assisting in distinguishing the human faces with higher similarity.
The recognition module 200 is configured to determine whether the face recognition information includes target face recognition information.
Specifically, a standard value of the feature information of the child face may be stored in the recognition module 200 in advance, and then the standard value is compared with the sampling value of the acquired feature information (face recognition information), and if there is a case where the standard value matches a partial sampling value (face recognition information to be recognized acquired by the acquisition module 100), it is determined that the acquired feature information has the feature information of the child face. That is, the target face recognition information exists in the face recognition information.
A detecting module 300, configured to detect existence time of the target face identification information.
Specifically, when the detection module 300 determines that the target face recognition information exists (i.e., a child exists), the display starts a timer, which detects the existence time of the target face recognition information. Wherein the time of existence is the viewing time of the child in front of the display.
And a control module 400, configured to control the brightness of the display frame according to the existence time.
Specifically, the existence time is used for judging whether the child is attentive to watch the display picture and whether the preset watching time is exceeded. If the child is determined to be attentive to view the display, reducing the brightness output of the display; and if the time for the child to watch the display picture is determined to exceed the preset watching time, stopping outputting the display picture.
In one embodiment, as shown in FIG. 9, the control module 400 includes:
the setting unit 410 is configured to set a first preset time and a second preset time, where the second preset time is greater than the first preset time.
Specifically, the first preset time is set to T1, and is mainly used to determine whether the child focuses on watching a display screen (e.g., a display screen played by a television) output by the display. When the time that the child is looking in front of the display exceeds T1, it can be determined that the child is looking at attentiveness. The second preset time is set as T2 and is mainly used for measuring the watching time of the children. When the watching time of the child in front of the display exceeds T2, the watching time of the child is determined to exceed the preset standard time.
The determining unit 420 is configured to determine whether the existing time is greater than a first preset time, determine whether the existing time is greater than the first preset time and less than a second preset time, and determine whether the existing time is greater than the second preset time.
Specifically, the existence time is labeled as T0, and the existence time T0 is the existence time of the target face recognition information. The target face is a child face. The display can only acquire the child face recognition information when the child is watching in front of the display, and the existence time T0 of the child face recognition information is detected. The presence time T0 reflects the viewing time of the child. When the existing time T0 is greater than the first preset time T1, it indicates that the child is in attentive view; when the existing time T0 is less than the first preset time T1, it indicates that the child is not in attentive viewing; when the existing time T0 exceeds the first preset time T1 but does not reach the second preset time T2, namely in the time from T1 to T0, the child is judged to be in the state of attentive viewing; when the existing time T0 exceeds the second preset time T2, it indicates that the viewing time period of the child has exceeded the standard time period allowed for viewing.
The adjusting unit 430 is configured to control the brightness of the display frame to be within a preset brightness range when the existence time is longer than a first preset time; when the existing time is longer than the first preset time and shorter than the second preset time, keeping the brightness of the display picture in a preset brightness range; and when the existing time is longer than the second preset time, stopping outputting the display picture.
Specifically, the preset luminance range is a luminance range suitable for children to watch. For example, the predetermined luminance range may be 80cd/m2To 90cd/m2。
In one embodiment, as shown in fig. 10, the adjusting unit 430 includes:
the backlight control subunit 431 is configured to obtain a backlight control signal of a display image, control a backlight driving current according to the backlight control signal, and control the luminance of the display image within a preset luminance range according to the backlight driving current.
Specifically, the backlight control subunit 431 is provided with a backlight control chip, and the backlight control chip obtains a backlight control signal corresponding to the display screen from the SOC. When it is judged that a child is attentively watching, the duty (percentage of positive values in one period of the signal) of the backlight control signal output by the SOC is reduced, and the backlight driving current output by the backlight control chip is also reduced, so that the brightness of the display picture is correspondingly darkened. Therefore, the SOC may make the luminance of the display screen in a preset luminance range by controlling the duty of the output backlight control signal.
The gamma voltage control subunit 432 is configured to obtain a gamma control signal corresponding to a display picture, control a gamma voltage according to the gamma control signal, and control the brightness of the display picture within a preset brightness range according to the gamma voltage.
Specifically, as shown in fig. 11, a first encoding area 432-1 for storing a gamma code, a second encoding area 432-2 and an analog-to-digital converter 432-3 are provided inside the gamma (gamma) voltage control subunit 432. Wherein, the first coding area 432-1 stores the brighter gamma code for controlling the normal display of the display picture; the second encoding area 432-2 stores a darker gamma code for controlling the display picture to be displayed with a darker brightness. When the SOC judges that a child is attentively watching, the SOC outputs a gamma control signal (not shown in the figure)Display) starts the second coding region 432-2 (obtains the gamma control signal corresponding to the display picture), the darker gamma code in the second coding region 432-2 converts the digital signal into the analog voltage output through the analog-to-digital converter 432-3 (controls the gamma voltage according to the gamma control signal), and controls the brightness of the display picture in the preset brightness range according to the analog voltage. The analog voltage is gamma voltage, the gamma voltage includes gamma1 to gamma N, the numbers 1 to N represent gamma voltages of different sizes, the value of N may be determined according to the brightness level of the display screen, and is not limited specifically here. Furthermore, the darker gamma code is converted into a lower gamma voltage, the lower gamma voltage controls the display to output a darker display image, and the gamma 1-gamma N respectively control the display images with corresponding brightness levels, so that the display device can be adjusted to the brightness range (e.g. 80 cd/m) suitable for children2To 90cd/m2) And corresponding gamma codes are set and stored in the second coding area 432-2, so that the brightness of the display picture can be controlled to be in a preset range by selecting the gamma codes of the area.
The gray scale control subunit 433 is configured to obtain a gray scale control signal corresponding to a display frame, control a gray scale value displayed by the display frame according to the gray scale control signal, and control the luminance of the display frame to be within a preset luminance range according to the gray scale value.
Specifically, as shown in FIG. 12, the gray-scale control subunit 433 includes a gray-scale reduction algorithm module 433-1 and a timing processing module 433-2. The gray scale reduction algorithm module 433-1 is configured to perform reduction processing on the input image gray scale value, for example, the input image gray scale value is 255, and then the output image gray scale value becomes 230 or lower after the gray scale reduction algorithm processing. It can be understood that, when the SOC determines that a child is attentively watching, the SOC outputs a gray scale control signal (not shown) to the gray scale control subunit 433, the gray scale control subunit 433 cuts off the data processing path L for normal display of the frame data input signal I-0 (including the brightness signal of the image), and utilizes the gray scale reduction algorithm module 433-1 to perform gray scale reduction processing on the frame data input signal I-0, and then outputs the frame data input signals O-1 to O-N with a preset brightness range via the timing processing module 433-2, wherein the value of N is determined according to the brightness range of the actually displayed frame, and is not limited herein. Alternatively, the gray level reduction algorithm module 433-1 may be implemented using a look-up table. That is, the gray scale value calculated by the gray scale reduction algorithm module 433-1 is stored in the table (i.e. the memory of the gray scale control subunit 433) in advance, when the gray scale value of a certain picture is input, the table stores the only corresponding gray scale value, and the operation process of the gray scale reduction algorithm module 433-1 is the process of extracting the corresponding gray scale value from the table, so that the operation speed of the gray scale reduction algorithm module 433-1 is greatly increased by adopting a table look-up method, thereby the brightness conversion of the displayed picture is rapid, and the retention effect is avoided.
The Display device provided in this embodiment is a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), a Quantum Dot Light-Emitting Diode (QLED), a curved Display device, or other Display devices.
According to the display method, the face detection and recognition are combined with the eyesight protection display process, the face of the target (child) is effectively recognized, and the brightness of the display picture is controlled in the process of the existence of the target face recognition information, so that the eyesight of the target is effectively protected.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A display method of a display, comprising:
acquiring face identification information to be identified;
judging whether the target face identification information exists in the face identification information, if so, starting a vision protection display process;
the eyesight protection display process comprises the following steps:
detecting the existence time of the target face recognition information;
controlling the brightness of a display picture according to the existence time;
the step of controlling the brightness of the display picture according to the existence time comprises the following steps:
setting a first preset time and a second preset time, wherein the second preset time is greater than the first preset time;
judging whether the existing time is greater than the first preset time, if so, controlling the brightness of the display picture to be in a preset brightness range; the preset brightness range is suitable for children to watch;
judging whether the existing time is greater than the first preset time and less than the second preset time, if so, keeping the brightness of the display picture in a preset brightness range;
and judging whether the existing time is greater than the second preset time, if so, stopping outputting the display picture.
2. The display method according to claim 1, wherein the step of acquiring the face recognition information to be recognized and determining whether the target face recognition information exists in the face recognition information comprises:
collecting a face image to be recognized;
acquiring feature information in the face image as face identification information;
comparing the face recognition information with preset target face recognition information, and judging whether the face recognition information has the target face recognition information; the target face identification information is characteristic information of the face of the child.
3. The display method according to claim 1, wherein the step of controlling the brightness of the display screen to be in a preset brightness range comprises:
acquiring a backlight control signal corresponding to a display picture;
controlling backlight driving current according to the backlight control signal;
and controlling the brightness of the display picture to be in a preset brightness range according to the backlight driving current.
4. The display method according to claim 1, wherein the step of controlling the brightness of the display screen to be in a preset brightness range comprises:
acquiring a gamma control signal corresponding to a display picture;
controlling a gamma voltage according to the gamma control signal;
and controlling the brightness of the display picture to be in a preset brightness range according to the gamma voltage.
5. The display method according to claim 1, wherein the step of controlling the brightness of the display screen to be in a preset brightness range comprises:
acquiring a gray scale control signal corresponding to a display picture;
controlling the gray scale value displayed by the picture according to the gray scale control signal;
and controlling the brightness of the display picture to be in a preset brightness range according to the gray-scale value.
6. The display method according to claim 1, further comprising, after the step of stopping outputting the display screen:
detecting the duration of stopping outputting the display picture;
judging whether the duration time is greater than a third preset time, if so, starting a channel for outputting a display picture;
otherwise, closing the channel for outputting the display picture.
7. A display device of a display, comprising:
the acquisition module is used for acquiring face identification information to be identified;
the recognition module is used for judging whether the target face recognition information exists in the face recognition information or not;
the detection module is used for detecting the existence time of the target face recognition information; and
the control module is used for controlling the brightness of a display picture according to the existence time;
the control module includes:
the device comprises a setting unit, a processing unit and a control unit, wherein the setting unit is used for setting first preset time and second preset time, and the second preset time is greater than the first preset time;
the judging unit is used for judging whether the existence time is greater than the first preset time, judging whether the existence time is greater than the first preset time and less than the second preset time, and judging whether the existence time is greater than the second preset time; and
the adjusting unit is used for controlling the brightness of the display picture to be in a preset brightness range when the existence time is longer than a first preset time; when the existing time is longer than the first preset time and shorter than the second preset time, keeping the brightness of the display picture in a preset brightness range; when the existing time is longer than the second preset time, stopping outputting the display picture;
the preset brightness range is a brightness range suitable for children to watch.
8. The display device according to claim 7, wherein the acquisition module executes the following steps in acquiring the face recognition information to be recognized:
collecting a face image to be recognized;
and acquiring characteristic information in the face image as face identification information.
9. The display device according to claim 7, wherein the recognition module executes the following steps when determining whether the target face recognition information exists in the face recognition information:
comparing the face recognition information with preset target face recognition information, and judging whether the face recognition information has the target face recognition information; the target face identification information is characteristic information of the face of the child.
10. The display device according to claim 7, wherein the adjustment unit includes:
the backlight control subunit is used for acquiring a backlight control signal of a display picture, controlling a backlight driving current according to the backlight control signal, and controlling the brightness of the display picture to be within a preset brightness range according to the backlight driving current;
the gamma voltage control subunit is used for acquiring a gamma control signal corresponding to a display picture, controlling a gamma voltage according to the gamma control signal, and controlling the brightness of the display picture to be within a preset brightness range according to the gamma voltage; and
the gray scale control subunit is used for acquiring a gray scale control signal corresponding to a display picture, controlling a gray scale value displayed by the picture according to the gray scale control signal, and controlling the brightness of the display picture to be within a preset brightness range according to the gray scale value.
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| CN111522440A (en) * | 2020-04-03 | 2020-08-11 | 广东小天才科技有限公司 | Screen display control method, device, equipment and storage medium |
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