JP5895426B2 - Display device - Google Patents

Description

  The present invention relates to a display device.

  In general, in a display device such as a digital photo frame or a television, a technique for changing the display according to the environment is known for ease of viewing. For example, in the case of a display device using a liquid crystal display, the brightness of the installation environment of the display device is measured using, for example, an illuminance sensor, and the brightness of the backlight of the liquid crystal display is controlled according to the measured brightness. Technology is known. For example, Patent Document 1 discloses a technique related to a display device that corrects the brightness of a backlight and the image quality of an input video according to the weather, the brightness of the surrounding environment, and the observation position.

JP 2007-043533 A

  Among display devices as described above, a display device having an illuminance sensor has the following problems depending on the position of the illuminance sensor.

  When the illuminance sensor is arranged on the back side of the display surface of the display device, for example, when the display device is installed on the bay window, the surrounding light is incident by the light incident from the bay window even if the room facing the display surface is relatively dark. If the display is bright, the display device may misjudge. Further, for example, when the display device is installed in a shelf, the display device may erroneously determine that the surrounding area is dark because the inside of the shelf is dark even if the room facing the display surface is relatively bright. .

  When an illuminance sensor is arranged on the display surface side of the display device, the display device can easily determine, for example, the brightness in the room accurately. On the other hand, when observing the display device so that an observer approaches and looks into it, the display device may erroneously determine that the display device has entered the shadow of the observer and the room has become dark.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a display device with less misjudgment of adjusting display according to ambient brightness.

In order to achieve the object, an aspect of the display device of the present invention includes a display unit that displays an image, a control unit that adjusts the display luminance of the display unit, and an illuminance value that is the brightness around the display unit. An illuminance sensor that outputs to the control unit; and an imaging unit that outputs the image obtained by imaging the subject located with respect to the display unit to the control unit, wherein the control unit images the subject. identify the position relative to the display portion of the object caught on the image based on the position said determined whether the shadow of an object according to the illuminance sensor based on the illuminance value in response to a result of the determination The display brightness is adjusted based on the above.
In order to achieve the above object, one embodiment of the display device of the present invention includes a display unit that displays an image, a control unit that adjusts display luminance of the display unit, and illuminance that is brightness around the display unit. An illuminance sensor that outputs a value to the control unit, and an infrared sensor that outputs to the control unit a movement signal that represents the amount of movement of an object that is present on the side of observing the display unit with respect to the display unit. The control unit specifies the position of the object with respect to the display unit based on the movement signal, determines whether the illuminance sensor is shaded by the illuminance sensor based on the position, and the result of the determination The display luminance is adjusted based on the illuminance value according to the above.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus with few misjudgments which adjust a display with ambient brightness can be provided.

The block diagram which shows the structural example of the image display apparatus which concerns on each embodiment of this invention. 6 is a flowchart illustrating an operation example of the image processing apparatus according to the first embodiment. The figure for demonstrating the example of the image which the imaging part of 1st Embodiment acquires. 10 is a flowchart illustrating an operation example of the image processing apparatus according to the second embodiment.

[First Embodiment]
First, a first embodiment of the present invention will be described with reference to the drawings. A configuration example of a digital photo frame 100 according to the present embodiment is shown in FIG. The digital photo frame 100 includes a main CPU 102, a RAM 104 including a DRAM, a ROM 106, a display unit 108 such as a liquid crystal display, an external memory I / F 110, a wireless LAN device 112, an imaging unit 114, and a memory. Built-in sub-CPU 116 of one-chip microcomputer, input unit 118, LED 120, illuminance sensor 122, human sensor 124 such as pyroelectric infrared sensor, vertical / horizontal sensor 126, power supply 128, bus 130, Is provided.

  The ROM 106, the external memory I / F 110, and the wireless LAN device 112 are connected to the main CPU 102 via the bus 130. The RAM 104, the display unit 108, and the imaging unit 114 are connected to the main CPU 102, respectively.

  The main CPU 102 and the sub CPU 116 are connected by serial communication, for example. The input unit 118, the LED 120, the illuminance sensor 122, the human sensor 124, and the vertical / horizontal sensor 126 are connected to the sub CPU 116, respectively. A power supply 128 is connected to each unit to supply power.

  The main CPU 102 performs various calculations and controls the operation of the entire digital photo frame 100. A RAM 104 is a memory for temporarily storing various data and developing image data for calculation by the main CPU 102. The ROM 106 stores, for example, a control program for the digital photo frame 100, and these programs and the like are appropriately output to the main CPU 102 in response to a request from the main CPU 102.

  The display unit 108 is, for example, a liquid crystal display. The display unit 108 displays various images under the control of the main CPU 102 and changes the luminance of the image displayed on the display unit 108. If the display unit 108 is a liquid crystal display, the luminance of the image displayed on the display unit 108 can be changed by changing the output of the backlight. The display unit 108 is not limited to a liquid crystal display, and may be an organic EL display or a plasma display. In the present embodiment, the following description will be made assuming that the display unit 108 is a liquid crystal display. When other displays are used, the brightness adjustment method is different, but the brightness adjustment is the same.

  The external memory I / F 110 is an interface for connecting an external memory used when inputting / outputting an image to / from the digital photo frame 100, for example. The wireless LAN device 112 is a device used when connecting the digital photo frame 100 to a network and exchanging data with devices on the network.

  The imaging unit 114 has, for example, an imaging element and a lens, and takes an image. The imaging unit 114 is provided on the display surface side (hereinafter referred to as the front side) where the display unit 108 of the digital photo frame 100 is provided. The imaging unit 114 can image the front side from the digital photo frame 100 at a resolution of, for example, VGA at 30 fps. The shooting data is output to the main CPU 102. The main CPU 102 can detect a person by performing image processing based on the photographing data.

  The sub CPU 116 receives user operations via the input unit 118, manages various sensors such as the illuminance sensor 122, the human sensor 124, and the vertical and horizontal sensors 126, and manages the power supply 128. The input unit 118 is a switch, a slider, a keyboard, a touch panel, or the like, and acquires a user operation. The input unit 118 outputs a signal representing a user operation to the sub CPU 116. The LED 120 presents various information to the user under the control of the sub CPU 116. For example, the status of the digital photo frame 100 such as power ON / OFF is displayed.

  The illuminance sensor 122 outputs a voltage value that matches the brightness of the environment to the sub CPU 116. The illuminance sensor 122 is installed on the front side of the digital photo frame 100 so as to be less affected by the place where it is placed. Based on the data input from the illuminance sensor 122, the sub CPU 116 converts the value indicating brightness with an AD converter in the sub CPU 116, and outputs the digital value to the main CPU 102. The main CPU 102 adjusts the display brightness of the display unit 108 based on a value corresponding to the input environmental illuminance. The illuminance sensor 122 may output a current value that matches the brightness of the environment to the sub CPU 116.

  The human sensor 124 is constituted by a pyroelectric infrared sensor, for example. The human sensor 124 is installed on the front side of the digital photo frame 100. The human sensor 124 acquires a temperature time change on the front side with respect to the digital photo frame 100. The human sensor 124 outputs the acquired temperature-time change to the sub CPU 116 as an analog value, for example. Based on the data inputted from the human sensor 124, the sub CPU 116 converts it into a digital value by an AD converter in the sub CPU 116 and outputs it to the main CPU 102. The main CPU 102 determines the presence / absence of a person by comparison such that the temperature / time change value exceeds or falls below a set threshold. Further, the sensitivity of the human sensor 124 can be adjusted by changing the threshold value.

  The vertical / horizontal sensor 126 detects whether the installation direction of the digital photo frame 100 is vertical or horizontal. The vertical / horizontal sensor 126 outputs the detected inclination direction as a digital value to the sub CPU 116.

  Thus, for example, the display unit 108 functions as a display unit that displays an image, for example, the main CPU 102 functions as a control unit that adjusts the display luminance of the display unit, and the illuminance sensor 122, for example, brightness of the surroundings of the display unit For example, the imaging unit 114 functions as an imaging unit that outputs, to the control unit, an image obtained by imaging the side of the display unit viewed from the display unit.

  Next, the operation of the digital photo frame 100 will be described. When the user operates the input unit 118 to turn on the power, a signal representing a user instruction output from the input unit 118 is input to the sub CPU 116. The sub CPU 116 activates the power supply 128 and causes the power supply 128 to supply power to each unit.

  The main CPU 102 supplied with the power develops the control program built in the ROM 106 on the RAM 104 and executes the control program. The main CPU 102 expands an image in the external memory connected to the external memory I / F 110 or an image obtained from the network via the wireless LAN device 112 on the RAM 104. The main CPU 102 outputs these images to the display unit 108 and causes the display unit 108 to display these images.

  In general, a technique for adjusting the display luminance of a digital photo frame based on ambient brightness, that is, ambient illuminance is known. When a liquid crystal display is used, the display brightness can be adjusted by the brightness of the backlight. For example, the backlight brightness is lowered in a dark environment, and the backlight brightness is increased in a bright environment, thereby realizing an easy-to-view display.

  Control of backlight luminance used in such a general liquid crystal display will be described. The backlight luminance of the liquid crystal display is controlled by PWM (Pulse Width Modulation). The sub CPU 116 notifies the main CPU 102 of the value obtained by AD converting the output of the illuminance sensor 122 as the environmental illuminance. The main CPU 102 collates the input environmental illuminance with the conversion table, thereby acquiring the PWM value of the backlight of the corresponding liquid crystal display. Using the obtained PWM value, the main CPU 102 controls the brightness of the backlight of the display unit 108. By performing the control as described above, the display brightness of the display unit 108 is adjusted according to the illuminance detected by the illuminance sensor 122.

  Also in the digital photo frame 100 according to the present embodiment, when it is determined that there is a person at a distant place, the luminance of the backlight is adjusted according to the above operation.

  Control of backlight luminance in the digital photo frame 100 based on a human detection operation using the imaging unit 114 will be described with reference to a flowchart shown in FIG. In this control, for example, when a person looks into the digital photo frame 100, the control is taken into consideration. That is, it is possible to prevent the display luminance of the display unit 108 from being changed more than necessary due to the signal indicating that the output of the illuminance sensor 122 is dark due to the shadow of the person.

In step S101, the main CPU 102 causes the image capturing unit 114 to perform image capturing, and acquires image data obtained by the image capturing.
In step S102, the main CPU 102 detects a face in the image based on the acquired image data. For example, a template matching method can be used for face detection.

  In step S103, the main CPU 102 detects the moving direction by comparing the face position detected in the process of the previous frame with the face position detected in step S102 of the main frame. The position of the face can be obtained as, for example, the upper end position of the face in the vertical direction.

In step S <b> 104, the main CPU 102 acquires the ratio, position, and movement direction of the detected face whose face is larger than the first threshold.

  The face ratio can be obtained as an area ratio by, for example, calculating the number of pixels of the observer's face and taking the ratio with the total number of pixels of the image. Further, the ratio of the face can be obtained as the length ratio in the vertical direction by taking, for example, the ratio of the vertical length of the observer's face and the vertical length of the image. The ratio of the face can be obtained as the length ratio in the left-right direction by taking the ratio of the length in the left-right direction of the observer's face and the length in the left-right direction of the image, for example.

In step S105, the main CPU102 determines the ratio of the detected face is greater or not than the second threshold value, i.e. whether the person is closer than a certain distance. Here, it is assumed that the second threshold is larger than the first threshold. For example, the distance between the person (observer) and the digital photo frame 100 can be simply estimated from the ratio of the face of the observer who is closest.

When the face ratio is larger than the second threshold, that is, when the distance between the person and the digital photo frame 100 is closer than a certain value, the main CPU 102 ends the process. That is, the backlight brightness is continuously adjusted to the same brightness without adjustment.
On the other hand, if it is determined in step S105 that the face ratio is equal to or smaller than the second threshold and the person is away from the digital photo frame 100 by a certain distance or more, the main CPU 102 advances the process to step S106.

  Note that the face moving direction may be taken into consideration in the determination in step S105. For example, when the person is moving so as to approach the center side of the display surface of the digital photo frame 100, the process is stopped, but when the person is moving away, the condition is advanced so that the process proceeds to step S106. May be.

  In step S106, the main CPU 102 determines whether or not the position of the face in the image is above a certain position. That is, the main CPU 102 determines the positional relationship of the face position with respect to the gravity direction. For example, it is possible to set a horizontal line of two-thirds from the lower side of the image and determine whether or not the upper end position of the face is above the horizontal line. If the face position is above a certain position, the main CPU 102 ends the process. That is, the backlight brightness is continuously adjusted to the same brightness without adjustment. On the other hand, if it is determined in step S106 that the face position is below a certain position, the main CPU 102 advances the process to step S107.

Note that the face moving direction may be taken into consideration in the determination in step S106. For example, it stops the process when the person is moving in the upward direction of the image may be weighted such conditions as the process proceeds to step S10 7 when moving downward.

  When the process proceeds to step S <b> 107 as described above, the person is far away or the person is near but is at a relatively low position as compared with the digital photo frame 100. That is, it is a case where it is considered that no shadow of a person is applied to the digital photo frame 100. At this time, the output of the illuminance sensor 122 is considered to be a reliable value without being affected by the shadow of the person. Therefore, in the subsequent processing, the brightness of the backlight is adjusted based on the output value of the illuminance sensor 122.

  In step S107, the main CPU 102 causes the illuminance sensor 122 to detect illuminance. As described above, the main CPU 102 acquires information related to the environmental illuminance from the illuminance sensor 122 via the sub CPU 116.

  If the measured value of the illuminance sensor 122 is darker than a certain value that is almost dark, an operation that is performed when the room is turned off, for example, an operation that turns off the display of the display unit 108 is performed. Also good. This is because it is difficult to achieve a completely dark situation as long as a human shadow is applied, and it can be considered that the indoor lamp has been turned off when the measured value of the illuminance sensor 122 is darker than a certain value.

In step S108, the main CPU 102 calculates the PWM value of the backlight based on the environmental illuminance acquired in step S107.
In step S109, the main CPU 102 changes the luminance of the backlight of the display unit 108 based on the PWM value calculated in step S108. Thereafter, the main CPU 102 ends the process.
The main CPU 102 repeatedly performs the processes in steps S101 to S109 described above continuously.

  According to this operation, for example, as shown in FIG. 3A, when a person is away from the digital photo frame 100, it is considered that the shadow of the person does not cover the illuminance sensor 122. In such a case, in step S104, the ratio of the person's face is determined to be equal to or lower than the first threshold value, and there is no face having a ratio larger than the first threshold value. That is, the face position and ratio are not acquired. At this time, since the face ratio is not acquired in the determination of step S105, the process proceeds to step S106 assuming that the face ratio is equal to or less than the second threshold value. Further, since the face position is not acquired in the determination in step S106, the process proceeds to step S107, assuming that the face position is not above a certain position. As a result, in step S107 to step S109, the main CPU 102 executes processing similar to normal backlight control and changes the brightness of the backlight as necessary.

  On the other hand, for example, as shown in FIG. 3B, when a person is very close to the digital photo frame 100, it is considered that the shadow of the person covers the illuminance sensor 122. At this time, it is considered that the value output by the illuminance sensor 122 does not appropriately represent the environmental illuminance. In such a case, in step S105, it is determined that the face ratio is larger than the second threshold value, and the process is terminated. That is, in step S107 to step S109, the luminance adjustment of the backlight that is performed is not performed. As a result, the luminance of the backlight of the display unit 108 does not change.

For example, as shown in FIG. 3C, when a person is relatively close to the digital photo frame 100 and the person is looking at the digital photo frame 100 from a high position, the shadow of the person covers the illuminance sensor 122. it is conceivable that. At this time, it is considered that the value output from the illuminance sensor 122 does not appropriately represent the environmental illuminance. Such case is obtained as the ratio of the face and the position or the like in step S104, but is determined to be less than or equal to the step S105 in the second threshold value lies above the position position is constant in the face in step S106 Is determined and the process is terminated. That is, the backlight brightness adjustment performed in steps S107 to S109 is not performed. As a result, the luminance of the backlight of the display unit 108 does not change.

On the other hand, for example, as shown in FIG. 3D, when a person is relatively close to the digital photo frame 100 and the person is looking at the digital photo frame 100 from a low position, the shadow of the person moves the illuminance sensor 122. It is thought not to cover. At this time, the output of the illuminance sensor 122 is considered to be a reliable value without being affected by the shadow of the person. Although the ratio of the face and the position or the like is obtained in such a case the step S104, on the lower side than the determined position position is constant face in step S106 to be equal to or less than the step S105 the second threshold And the process proceeds to step S107. Accordingly, in steps S107 to S109, the main CPU 102 executes processing similar to that of normal backlight control, and changes the luminance of the backlight as necessary.

  According to the present embodiment, it is appropriate to adjust the display luminance based on whether the digital photo frame 100 is in the shadow of a person based on the image acquired by the imaging unit 114, that is, based on the output of the illuminance sensor 122. It is determined whether or not. As a result of this determination, if it is appropriate to adjust the display brightness based on the output of the illuminance sensor 122, the display brightness is adjusted. If it is determined to be inappropriate, the display brightness is not adjusted. As a result, the digital photo frame 100 can perform easy-to-view display by appropriately adjusting the luminance regardless of the presence or absence of a person.

  In the present embodiment, it is configured to determine whether to adjust the brightness of the display unit 108 based on the distance between the digital photo frame 100 and the person and the positional relationship between the digital photo frame 100 and the person. You may make it determine based on either one.

[Second Embodiment]
A second embodiment of the present invention will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. In the present embodiment, the backlight luminance is controlled based on a human detection operation using the human sensor 124.

  A pyroelectric infrared sensor can be used as the human sensor 124. The pyroelectric infrared sensor detects the movement of a person and changes the output voltage over time. The degree of this time change depends on the amount of temperature time change, and the time change of the output voltage increases as the person moves greatly. If the distance is short, the output voltage changes over time even with small movements. Therefore, when there is a large voltage time change, there is human movement, and when a small voltage time change continues to be detected, it can be determined that the person is staying nearby. Conversely, after a large voltage / time change is detected, if no voltage / time change is detected for a certain period, it can be determined that the person is no longer moving. Using the human sensor 124 using such a pyroelectric infrared sensor, the luminance of the backlight can be adjusted in accordance with the position of the person as in the case of using the imaging unit 114 of the first embodiment. it can.

  In this way, for example, the human sensor 124 functions as an infrared sensor that outputs a movement signal indicating the amount of movement of an object present on the side of observing the display unit to the display unit.

The operation according to the present embodiment will be described with reference to the flowchart shown in FIG.
In step S <b> 201, the main CPU 102 acquires a sensor value that is a digital value output from the human sensor 124 and digitally converted by the sub CPU 116.
In step S202, the main CPU 102 stores the sensor value acquired in step S201 as a history.
In step S203, the main CPU 102 performs filtering processing such as low-pass filtering on the sensor value.

  In step S204, the main CPU 102 refers to the history stored in step S202 to determine whether or not the temporal change amount of the filtered sensor value is larger than the third threshold value. Here, the third threshold is a value that is larger than the value when there is a large movement of the person. If the time variation of the sensor value is larger than the third threshold value, the wait timer is initialized in step S205. Thereafter, the main CPU 102 ends the process. On the other hand, if the time variation of the sensor value is equal to or smaller than the third threshold value, the process proceeds to step S206.

  In step S206, the main CPU 102 determines whether or not the wait timer has reached the end value. If it is not the end value, the main CPU 102 shifts the processing to step S207.

  In step S207, the main CPU 102 determines whether or not the temporal change amount of the sensor value is larger than the fourth threshold value. Here, the fourth threshold value is a value smaller than the third threshold value, and is a value such that the temporal change amount of the sensor value when the person is still near the digital photo frame 100 is larger than the value. It is. That is, the person is close to the digital photo frame 100 when the time change amount of the sensor value is larger than the fourth threshold value, and the person is the digital photo frame 100 when the time change amount of the sensor value is equal to or less than the fourth threshold value. It can be judged that it is not near. If the time change amount of the sensor value is larger than the fourth threshold value, the process proceeds to step S205 to initialize the wait timer. On the other hand, if the time change of the sensor value is equal to or smaller than the fourth threshold value, the main CPU 102 shifts the processing to step S208.

  In step S208, the main CPU 102 starts counting up the wait timer. If the wait timer has already been counted up, the count up is continued. Thereafter, the main CPU 102 ends the process.

If it is determined in step S206 that the wait timer is the end value, the main CPU 102 shifts the processing to step S209.
In step S209, the main CPU 102 stops the wait timer.

In step S <b> 210, the main CPU 102 acquires information related to the environmental illuminance output from the illuminance sensor 122 and digitally converted by the sub CPU 116 as described above.
If the measured value of the illuminance sensor 122 is darker than a certain value that is almost dark, an operation that is performed when the room is turned off, for example, an operation that turns off the display of the display unit 108 is performed. Also good. This is because it is difficult to achieve a completely dark situation as long as a human shadow is applied, and it can be considered that the indoor lamp has been turned off when the measured value of the illuminance sensor 122 is darker than a certain value.

In step S211, the main CPU 102 calculates the PWM value of the backlight based on the environmental illuminance acquired in step S210.
In step S212, the main CPU 102 changes the brightness of the backlight of the display unit 108 based on the PWM value calculated in step S211. Thereafter, the main CPU 102 ends the process.

  The main CPU 102 repeatedly performs the processes in steps S201 to S212 described above continuously. According to this embodiment, when the person is moving greatly, the process proceeds to step S205 by the determination in step S204, and the wait timer is initialized. During this time, the backlight control in steps S210 to S212 is not executed. If the person has not moved much but is near the digital photo frame 100, the process proceeds to step S205 in step S207, and the wait timer is initialized. During this time, the backlight control in steps S210 to S212 is not executed.

  On the other hand, if a state in which a large movement of the person is not detected and the person is not near the digital photo frame 100 continues, the timer is counted up in step S208, and the timer value eventually becomes the timer end value in step S206. In this case, the backlight luminance is controlled in steps S210 to S212 until the movement of the person is detected in step S204.

  Also in this embodiment, when it is determined that a person is near, the application of the detection value of the illuminance sensor 122 to the PWM control of the backlight is stopped as in the case of the first embodiment. On the other hand, if it is determined that no person is nearby, the detection value of the illuminance sensor 122 is applied to the PWM control of the backlight. As described above, in the digital photo frame 100, the backlight luminance control of the liquid crystal display can be realized with few malfunctions.

  In both the first embodiment and the second embodiment, the digital photo frame 100 has been described as a configuration including both the imaging unit 114 and the human sensor 124. However, the digital photo frame 100 may not include the human sensor 124 in the first embodiment, and the digital photo frame 100 may not include the imaging unit 114 in the second embodiment. The human sensor 124 is not limited to the pyroelectric infrared sensor, and other infrared sensors, ultrasonic sensors, or the like may be used.

  Until now, the digital photo frame has been described as an example. However, the first and second embodiments are not limited to the digital photo frame, but may be an apparatus that displays an image of a television, a clock, or other devices. Any display device can be used. A small display device such as a digital photo frame is particularly effective because it is observed as if a person is looking into it, that is, the display device often enters the shadow of the observer.

  In the description of the first embodiment and the second embodiment, the display brightness of the display unit 108 is not adjusted when a person is near the digital photo frame 100, for example. However, without adjusting the display brightness, for example, the output value of the illuminance sensor 122 may be corrected by the shadow of the person, and the display brightness may be adjusted using the correction value. .

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, if the problem described in the column of the problem to be solved by the invention can be solved even if some components are deleted from all the elements shown in the embodiment, and the effect of the invention can be obtained, this A configuration from which components are deleted can also be extracted as an invention. Furthermore, constituent elements over different embodiments may be appropriately combined.

  The invention described in the scope of claims of the present application is appended below.

[1]
A display for displaying an image;
A control unit for adjusting display brightness of the display unit;
An illuminance sensor that outputs an illuminance value that is brightness around the display unit to the control unit;
An imaging unit that outputs to the control unit an image obtained by imaging the side of observing the display unit with respect to the display unit;
A display device comprising:
The controller is
Specifying the position of the subject in the image based on the image with respect to the display unit;
Determining whether the illuminance sensor enters the shadow of the subject based on the position;
Adjusting the display brightness based on the illuminance value according to the result of the determination;
A display device characterized by that.

[2]
The controller is
Based on the image, the distance between the display unit and the subject and / or the positional relationship of the display unit and the subject with respect to the gravitational direction are obtained,
Based on the distance and / or the positional relationship, it is determined whether or not the illuminance sensor enters the shadow of the subject.
[1] The display device according to [1].

[3]
The control unit does not adjust the display luminance of the display unit using the illuminance value when it is determined that the illuminance sensor enters the shadow of the subject.
[1] The display device according to [1].

[4]
When determining that the illuminance sensor enters the shadow of the subject, the control unit obtains a corrected illuminance value obtained by correcting the illuminance value by the amount of the shadow, and uses the corrected illuminance value to determine the illuminance value of the display unit. Adjust the display brightness,
[1] The display device according to [1].

[5]
The display device according to any one of [1] to [4], wherein the subject is a person.

[6]
The control unit detects the face of the person based on the image, and specifies the position of the face with respect to the illuminance sensor when the ratio of the face to the image is greater than a first threshold.
[5] The display device according to [5].

[7]
When the ratio of the face is greater than the first threshold and greater than the second threshold with respect to a second threshold that is greater than the first threshold, the illuminance sensor is Determining that it falls into the shadow of the person,
[6] The display device according to [6].

[8]
When the ratio of the face is greater than the first threshold and less than or equal to the second threshold with respect to a second threshold that is greater than the first threshold, the control unit determines the position of the face. Is determined that the illuminance measurement unit enters the shadow if it is above a certain position of the image,
[6] The display device according to [6].

[9]
A display for displaying an image;
A control unit for adjusting display brightness of the display unit;
An illuminance sensor that outputs an illuminance value that is brightness around the display unit to the control unit;
A pyroelectric infrared sensor that outputs a movement signal representing the amount of movement of an object present on the side of observing the display unit to the display unit;
A display device comprising:
The controller is
Identifying the position of the object relative to the display based on the movement signal;
Determining whether the illuminance sensor enters the shadow of the object based on the position;
Adjusting the display brightness based on the illuminance value according to the result of the determination;
A display device characterized by that.

[10]
The controller is
Based on the movement signal, change information indicating whether or not the positional relationship between the display unit and the object has changed more than a predetermined value, and the distance between the object and the display unit from a predetermined distance And distance information indicating whether or not
Determining whether the illuminance sensor enters the shadow of the object based on the change information and the distance information;
[9] The display device according to [9].

[11]
The display device according to [9], wherein the control unit does not change the display brightness when it is determined that the illuminance sensor enters a shadow of the object.

[12]
When the control unit determines that the illuminance sensor enters the shadow of the object, the control unit adjusts the display brightness using a corrected illuminance value obtained by correcting the illuminance value by the amount of the shadow. 9].

[13]
The display device according to any one of [9] to [12], wherein the object is a person.

[14]
The infrared sensor outputs a voltage depending on the temperature of the person, and the control unit specifies the position of the person with respect to the illuminance measurement unit based on a temporal change amount of the voltage.
[13] The display device according to [13].

[15]
The control unit determines that the illuminance sensor enters the shadow of the person when the time change amount of the voltage is greater than a third threshold.
[14] The display device according to [14].

[16]
When the time change amount of the voltage is equal to or smaller than a third threshold value, the control unit determines that the time change amount of the voltage is the fourth threshold value with respect to a fourth threshold value that is smaller than the third threshold value. If it is greater than the threshold, it is determined that the illuminance sensor enters the shadow of the person.
[14] The display device according to [14].

  DESCRIPTION OF SYMBOLS 100 ... Digital photo frame, 102 ... Main CPU, 104 ... RAM, 106 ... ROM, 108 ... Display part, 112 ... Wireless LAN device, 114 ... Imaging part, 116 ... Sub CPU, 118 ... Input part, 120 ... LED, 122 ... Illuminance sensor, 124 ... Human sensor, 126 ... Vertical / horizontal sensor, 128 ... Power supply, 130 ... Bus.

Claims (16)

A display for displaying an image;
A control unit for adjusting display brightness of the display unit;
An illuminance sensor that outputs an illuminance value that is brightness around the display unit to the control unit;
An imaging unit that outputs an image obtained by imaging a subject located with respect to the display unit to the control unit;
Comprising
The controller is
Identifying the position of the subject relative to the display unit based on an image of the subject ,
Determining whether or not a shadow of the subject is applied to the illuminance sensor based on the position;
Adjusting the display brightness based on the illuminance value according to the result of the determination;
A display device characterized by that. The controller is
Based on the image, the distance between the display unit and the subject and / or the positional relationship of the display unit and the subject with respect to the gravitational direction are obtained,
It said distance and / or on the basis of the positional relationship, it is determined whether the shadow of the object to the illuminance sensor enters,
The display device according to claim 1. Wherein, when determining that the shadow of the object to the illuminance sensor is applied, does not perform adjustment of the display luminance of the display unit using the illumination value,
The display device according to claim 1. Wherein, when determining that the shadow of the object to the illuminance sensor is applied, the intensity value determined by the amount corrected correction intensity value of the shadow of the display unit with the correct intensity value Adjusting the display brightness;
The display device according to claim 1.   The display device according to claim 1, wherein the subject is a person. The control unit detects the face of the person based on the image, and specifies the position of the face with respect to the illuminance sensor when a ratio of the face to the image is greater than a first threshold.
The display device according to claim 5. The control unit, to the first second threshold greater than the threshold, the illuminance sensor when the ratio of the face is greater than the first large and the second threshold value than the threshold it is determined that it takes the shadow of the person,
The display device according to claim 6. When the ratio of the face is greater than the first threshold and less than or equal to the second threshold with respect to a second threshold that is greater than the first threshold, the control unit determines the position of the face. There the shadow of the person to the illuminance sensor is determined to take if above the predetermined position of the image,
The display device according to claim 6. A display for displaying an image;
A control unit for adjusting display brightness of the display unit;
An illuminance sensor that outputs an illuminance value that is brightness around the display unit to the control unit;
An infrared sensor that outputs a movement signal representing a movement amount of an object existing on the side of observing the display unit to the display unit to the control unit;
Comprising
The controller is
Identifying the position of the object relative to the display based on the movement signal;
Determining whether or not the illuminance sensor is shaded by the object based on the position;
Adjusting the display brightness based on the illuminance value according to the result of the determination;
A display device characterized by that. The controller is
Based on the movement signal, change information indicating whether or not the positional relationship between the display unit and the object has changed more than a predetermined value, and the distance between the object and the display unit from a predetermined distance And distance information indicating whether or not
Determining whether the shadow of the object is applied to the illuminance sensor based on the change information and the distance information;
The display device according to claim 9. Wherein the control unit, the display device according to claim 9, wherein when said shadow of said object illuminance sensor is judged according, characterized in that it does not change the display brightness. Wherein, when determining that the shadow of the object to the illuminance sensor is applied, the illumination value calculated correction intensity values only corrected amount of the shadow, the display brightness using the correction intensity value The display device according to claim 9, wherein the display device is adjusted.   The display device according to claim 9, wherein the object is a person. The infrared sensor outputs a voltage depending on the temperature of the person, and the control unit specifies the position of the person with respect to the illuminance sensor based on a temporal change amount of the voltage.
The display device according to claim 13. Wherein the control unit, the time variation of the voltage is determined to the shadow of the person to the illuminance sensor is greater than the third threshold value such,
The display device according to claim 14. When the time change amount of the voltage is equal to or smaller than a third threshold value, the control unit determines that the time change amount of the voltage is the fourth threshold value with respect to a fourth threshold value smaller than the third threshold value. If greater than the threshold, it is determined that the illuminance sensor is shaded by the person.
The display device according to claim 14.

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