JP2009100117A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device that makes it possible to view a screen from a user even when external light hits the screen and it is difficult to view the screen. <P>SOLUTION: The display device includes a display part 10 for displaying images for which a touch panel 12 is attached to the surface of the screen 11, a user detection part 30 for detecting the positions of a plurality of users A, an external light detection part 40 for detecting the external light hitting the display part 10, and a control part 60 for changing the light quantity of the external light so that the users A are not affected by the external light. When the light quantity of the external light is a prescribed value or more, the control part 60 determines whether it is hard for the respective users A to view the screen 11 due to reflected light from the detected positions of the respective users A and the direction of the reflected light, and when determining that it is difficult to view the screen 11, the control part 60 changes the light quantity of the external light and makes the images visible to the plurality of users A. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device that displays an image on a screen.

  In recent years, display devices having a large screen have been developed. This display device having a large screen is often used for presentations such as product announcements and plan explanations.

  However, if the screen for displaying an image is large, there is a high possibility that external light such as lighting equipment or sunlight will hit the screen. For example, when light from a lighting device is illuminated on the screen from the front of the display device, depending on how the light hits, a user who looks at the screen may not be able to see the screen. Therefore, there is a problem that an effective presentation cannot be performed.

By the way, Patent Document 1 discloses a lighting device that includes a human body detection sensor and reduces the light amount of a lighting device when a human approach is detected.
JP 2000-337064 A

By the way, in Patent Document 1, the amount of external light is changed depending on the presence or absence of a user. Therefore, there is an effect of preventing the screen from becoming difficult to see by reducing the amount of external light when there is a user.

  However, if the amount of light is changed according to the presence or absence of the user, the amount of external light is reduced even when the screen can be normally viewed. Therefore, there is a problem of wasteful control for changing the amount of light. In addition, when a presentation is being performed, if the light intensity is changed unnecessarily, it becomes difficult to see the material at hand, resulting in inconvenience to the user.

  In view of the above, an object of the present invention is to provide a display device that allows a user to view a screen even when the screen is exposed to external light and is difficult to see.

  In order to achieve the above object, in the present invention, a display unit having a screen for displaying an image, an external light detection unit for detecting external light hitting the screen, and the positions of a plurality of users viewing the screen are detected. The apparatus includes a user detection unit and a control unit that changes the amount of the external light so that the user is not affected by the external light.

  When external light hits the screen, the reflected light makes it difficult for the user to see the screen. Therefore, the control unit changes the amount of external light so that the user is not affected by the external light. Thereby, the display device prevents the user from becoming difficult to see the screen due to reflected light of outside light.

  Specifically, the external light detection unit detects whether there is external light hitting the screen. When detecting that the screen is exposed to external light, the external light detection unit detects a peak position on the screen that is exposed to external light, that is, a position where the external light is most exposed.

  The control unit calculates the incident angle of the external light that hits the detected peak position. For example, external light detection units including a plurality of line sensors that receive external light are arranged at both ends in the left-right direction of the display unit. The control unit calculates the incident angle of the external light hitting the screen from the peak position of the external light hitting the line sensor of the external light detection unit. Then, the control unit specifies the direction of the reflected light from the calculated incident angle.

  The user detection unit detects the positions of a plurality of users viewing the screen, that is, a plurality of users in front of the screen. For example, the user detection unit includes an image sensor that images the front of the display unit, and images the front of the display unit using the image sensor. The control unit stores a recognition pattern for specifying a plurality of users, performs pattern matching between the captured user image and a recognition pattern stored in advance, and specifies the position of the user.

  The control unit changes the amount of external light when the direction of the reflected light is directed to the position of the user. For example, when external light is emitted from a lighting device in front of the display unit, the control unit controls the light amount of the lighting device. When external light is emitted from sunlight in front of the display unit, the control unit controls the amount of sunlight using a shielding member such as a curtain or a film in the light path from the sunlight to the screen. Specifically, the display device includes a movable shielding member, and when the direction of the reflected light is directed to the position of the user, the control unit moves the shielding member to shield the light.

  By the way, the control of the amount of external light is performed when the user feels it is difficult to see the screen, for example, when the amount of external light is brighter than a predetermined value calculated and determined by various experiments. The control of the amount of external light is determined according to the direction of reflected light and the position of each user. For example, when the direction of reflected light does not coincide with the position of each user, the amount of external light is not changed. Alternatively, the existence range in which the user exists is specified from the position of each user, and the amount of external light is not changed when the reflected light is directed outside the existence range.

  The existence range is determined based on the users who are located on the left and right sides of the user's position by recognizing each user from the image to identify the user's position.

  When the amount of external light hitting the screen is small, for example, when the amount of external light is less than a predetermined value, the screen is not easily seen. Therefore, the external light detection unit detects the light amount at the peak position, and when the light amount is less than a predetermined value, the control unit does not change the light amount of the external light. This reduces the need for the controller to change the amount of extraneous light.

  As external light, sunlight, indoor lighting, etc. can be considered. For this reason, external light often strikes from above the external light detection unit. Therefore, the light collecting unit is provided so that the external light hitting from above is collected at the center of the external light detecting unit. Thereby, the external light detection part can detect the external light which hits a screen more.

  According to the present invention, it is possible to prevent the screen from becoming difficult to see due to the reflected light of the external light by changing the amount of the external light according to the direction of the reflected light of the external light hitting the screen. Therefore, the user can surely see the image displayed on the screen.

  In particular, when a presentation is being performed, the amount of external light is changed when the reflected external light that is brighter than a predetermined value hits the user, so the amount of light is changed unnecessarily because the external light is bright. Therefore, it is possible to provide an easy-to-view screen for each user, and to provide a display device that reduces as much as possible the situation in which the local material is difficult to see.

  Hereinafter, the display device of the present invention will be described in detail.

  The display device of the present invention displays an image input to the display unit 10 by an input tool such as a finger or a dedicated touch pen. The display device is used for presentations such as product announcements and plan explanations. Therefore, when the display device makes it difficult for a plurality of users A to view an image displayed on the screen 11 of the display unit 10 due to external light hitting the screen, particularly reflected light from the lighting device 90 provided in the room. In addition, a function of changing the amount of light of the light source 91 of the lighting device 90 so that each user A can see the light is provided.

  As shown in FIGS. 1 and 2, the display device includes a display unit 10 that displays an image, a pedestal 20 that supports the display unit 10, and a user detection unit 30 that detects the positions of a plurality of users A. The external light detection unit 40 that detects the light source 91 of the lighting device 90, the control signal transmission unit 50 that adjusts the light amount of the light source 91, and the control device 60 that controls these devices.

  The display unit 10 includes a screen 11 that displays an image, a touch panel 12 that is attached to cover the surface of the screen 11, a base 53 that supports the display unit 10, and a connection unit 51 that connects the screen 11 and the base 53. It consists of. The display unit 10 is disposed on the upper surface of the support base 22 of the base 20. The screen 11 is a CRT display, a liquid crystal display, or the like, for example, and displays an input image based on an instruction from the control device 60.

  The touch panel 12 is formed from a dedicated transparent screen. As shown in FIG. 3, the touch panel 12 includes LED arrays 13x and 13y that project light such as infrared rays, and phototransistor arrays 14x and 14y that receive light projected from the LED arrays 13x and 13y. The LED arrays 13x and 13y and the phototransistor arrays 14x and 14y constitute an input sensor that detects an input operation on the touch panel 12.

  The LED arrays 13x and 13y include an X-direction LED array 13x that projects light in the X direction of the screen 11 and a Y-direction LED array 13y that projects light in the Y direction. A plurality of LED arrays 13x and 13y are provided along each side of the touch panel 12. The X direction LED array 13 x is disposed on the lower side of the touch panel 12, and the Y direction LED array 13 y is disposed on the left side of the touch panel 12.

  The phototransistor arrays 14x and 14y are composed of an X-direction phototransistor array 14x that receives light projected from the X-direction LED array 13x and a Y-direction phototransistor array 14y that receives light projected from the Y-direction LED array 13y. Composed. A plurality of phototransistor arrays 14x and 14y are provided along each side of the touch panel 12. The X direction phototransistor array 14 x is disposed on the upper side of the touch panel 12, and the Y direction phototransistor array 14 y is disposed on the right side of the touch panel 12.

  The input sensor detects the position touched with the input tool by an infrared ray blocking method. Specifically, when the user A touches the surface of the touch panel 12 with the input tool, the light projected from the LED arrays 13x and 13y is blocked by the input tool. Therefore, some phototransistor arrays 14x and 14y cannot receive light. The coordinates of the phototransistor arrays 14x and 14y that did not receive the light projected from the LED arrays 13x and 13y are confirmed, and the coordinates are specified as the coordinates of the position touched by the input tool.

  The pedestal 20 includes a base 21 that comes into contact with the floor surface, a support base 22 on which the display unit 10 is placed, and two leg portions 23 that connect the base 21 and the support base 22.

  The bottom surface of the base 21 is provided with a moving wheel (caster) 24 for facilitating the movement of the display device and a fall prevention leg for preventing the display device from falling during an earthquake or movement. A printer 70 for printing the image displayed on the screen 11 is disposed on the upper surface of the base 21.

  A scanner 80 for capturing an image to be displayed on the screen 11 is disposed on the lower surface of the support base 22.

  The user detection unit 30 detects the positions of a plurality of users A who are at positions facing the display unit 10, for example, a plurality of users A who are viewing an image displayed on the screen 11. Specifically, the user detection unit 30 includes an image sensor that images the front of the display unit 10. The user detection unit 30 is installed above the center of the display unit 10. The user detection unit 30 captures an image at a predetermined timing. For example, imaging is performed periodically or based on an instruction from the control unit 60. The user detection unit 30 outputs the captured user image to the control unit 60.

  The external light detection unit 40 detects light from the illumination device 90 that hits the screen. The external light detection unit 40 includes two line sensors 40L and 40R that receive light from the lighting device 90, and a light collecting unit 41 that collects the light from the lighting device 90 with respect to each line sensor 40L and 40R. Prepare.

  The two line sensors 40L and 40R have a plurality of photosensitive portions arranged in a row. The line sensors 40L and 40R are provided along the longitudinal direction of the display unit 10. The line sensors 40L and 40R are installed above the left and right ends of the display unit 10, respectively.

  The photosensitive portions receive light, and each is assigned a number. In the present embodiment, the line sensor L40L is determined as SL0, SL1, SL2,... SL100 from the left toward the line sensor L40L. The line sensor R40R is determined as SR0, SR1, SR2,... SR100 from the left toward the line sensor R40R.

  The external light detection unit 40 detects the presence or absence of light from the lighting device 90. When detecting that there is light from the illumination device 90, the external light detection unit 40 detects the number of the photosensitive unit of each of the line sensors 40 </ b> L and 40 </ b> R that has received light from the illumination device 90, and outputs the detected number to the control unit 60. . Moreover, the external light detection part 40 detects the light quantity of the light from the illuminating device 90 which hits each line sensor 40L and 40R. The external light detection unit 40 outputs the detected light amount to the control unit 60.

  In many cases, the light from the lighting device 90 comes from the front upper direction of the outside light detection unit 40. As shown in FIG. 4, the condensing part 41 is a lens for condensing the external light coming from the front upper direction in the center of the line sensors 40L and 40R. For example, it is a cylindrical lens extending in the longitudinal direction of the line sensors 40L and 40R. The condensing part 41 is attached so that the surface of each line sensor 40L, 40R may be covered.

  The control signal transmission unit 50 communicates with the light source control unit 92 that controls the light amount of the light source 91 provided in the illumination device 90 based on an instruction from the control unit 60. Specifically, the control signal transmission unit 50 is connected to the light source control unit 92 by a cable or wirelessly. The storage unit 62 stores a communication frequency data table for each model of the lighting device 90 in advance. The control signal transmission unit 50 extracts the communication frequency corresponding to the lighting device 90 from the communication frequency data table, and sets the communication frequency to be transmittable / receivable.

  When it is determined that the light amount of the light source 91 needs to be changed from the light amount detected by the control unit 60, the control signal transmission unit 50 generates a control signal based on an instruction from the control unit 60 and transmits the control signal to the light source control unit 92. To do. Then, the light source control unit 92 controls the light amount of the light source 91 based on the received control signal. Note that when the light amount detected by the external light detection unit 40 is less than a predetermined value, the control signal transmission unit 50 does not change the light amount of the light source 91.

  The control unit 60 includes a memory 62 that temporarily stores data such as RAM and ROM, a storage unit 63 that stores control programs and data, an LCD controller 64 that displays an image on the screen 11, and a CPU 61 that controls these devices. And a microcomputer having

  The CPU 61 reads out a control program stored in a storage unit 63 composed of an HDD (Hard Disk Drive) to the memory 63 and executes the control program. Each device operates according to a control program.

  As shown in FIG. 5, the control unit 60 specifies an existence range where a plurality of users exist by a pattern matching method using a neural network.

  Specifically, the face image of each user A is stored in the storage unit 63 in advance in the storage unit 63 as a database. When the control unit 60 receives the captured user image, the control unit 60 uses the matrix of a predetermined size and the X direction and the Y direction based on the face image stored in the storage unit 63 of the captured user image (see FIG. 5A). Sequential pattern matching is determined in the direction. When the presence of an image matching the face image is detected in the user image, the control unit 60 determines that the position of the matrix including the image is the position of the face of each user A.

  As shown in FIG. 5B, the control unit 60 specifies a range where a plurality of users A exist on the display unit 10 from the determined position of the user's face. Specifically, as shown in FIG. 6, a table indicating angles β1 and β2 from the display unit 10 corresponding to the X coordinate of the captured user image is stored in the storage unit 63 in advance. The control unit 60 reads from the table the angle β1 to the left end and the angle β2 to the right end of the existence range where the user A exists with respect to the display unit 10 from the determined coordinates X1 and X2. That is, the control unit 60 detects X1 that is the X coordinate of the captured user image on the leftmost side of the specified face position, and reads the angle β1 corresponding to the detected X1 from the table. The angle β2 is obtained in the same manner.

  Thereby, the control unit 60 can specify the angle β1 to the angle β2 as the existence range of each user A. When there are a plurality of users A, the user A must be detected each time the user A moves even if the position of the user A is specified individually. However, by regarding the existence range of the plurality of users A as the position of one user A, it is not necessary to consider the movement of each user A, and the processing in the control unit 60 can be performed quickly. Therefore, it is only necessary to detect the existence range of the entire user, and it is only necessary to deal with when the existence range changes.

  The control unit 60 specifies the direction of the reflected light from the incident angle α of the light from the lighting device 90 that hits the display unit 10 and determines whether the direction is within the existence range.

  First, the control unit 60 calculates the incident angle α of light from the lighting device 90. As shown in FIG. 7, each of the line sensors 40L and 40R has 101 photosensitive portions SL0 to SL100. The storage unit 63 stores in advance a database of incident angles αL and αR of light from the illumination device 90 corresponding to the numbers of the photosensitive units of the line sensors 40L and 40R.

  When each line sensor 40L, 40R detects that the light from the illumination device 90 has been struck, the line sensor 40L, 40R detects the photosensitive part having the highest output (SLmax, SRmax) among the outputs from the photosensitive part. When the eleventh photosensitive unit SL10 and the 31st photosensitive unit SR30 have the highest output among all the photosensitive units, the photosensitive unit number is output to the control unit 60 with the photosensitive unit as a peak position.

  The controller 60 refers to the data table of the incident angles αL and αR stored in advance, and identifies the incident angles αL and αR of the light from the illumination device 90 from the numbers of the photosensitive units SL10 and SR10. Then, the control unit 60 calculates the incident angle α of light from the illumination device 90 from the average value ((αL + αR) / 2) of the incident angle αL and the incident angle αR.

  Next, the control unit 60 calculates the direction of the reflected light of the light from the lighting device 90 from the calculated incident angle α, specifically, as shown in FIG. 8, the reflected angle θ of the reflected light. It is determined whether or not the reflection angle θ is within the existence range of each user A. The reflection angle θ is obtained by the following equation.

  θ = 180−α (1)

  Therefore, the control unit 60 determines whether the reflection angle θ is located in the existence range of each user A, that is, between the angle β1 and the angle β2.

  β2 <180−α <β1 (2)

  If the reflection angle θ satisfies the expression (2), the reflected light of the light from the lighting device 90 does not hit each user A, and there is no need to adjust the orientation of the display unit 10. However, if the reflection angle θ is an angle that does not satisfy the expression (2), the reflected light of the light from the lighting device 90 hits one of the users A, and the screen 11 is difficult for the user to see. ing.

  Therefore, the control unit 60 needs to adjust the light amount of the light source 91 of the lighting device 90. Specifically, as illustrated in FIG. 9, the control unit 60 determines whether or not to change the light amount of the light source 91 from the light amount of the light source 91 of the illumination device 90 that has hit the external light detection unit 40. When the light amount of the light source 91 of the illumination device 90 input from the external light detection unit 40 is larger than a predetermined value stored in advance, the light source 91 is supplied to the light source control unit 92 of the illumination device 90 via the control signal transmission unit 50. The light quantity of the light source 91 is changed. When it is smaller than the predetermined value, the light amount of the light source 91 is not changed.

  The controller 60 changes the light amount of the light source 91 according to the difference between the detected light amount and a predetermined value. Specifically, the control unit 60 compares the detected light amount of the light source 91 with a predetermined value. The control unit 60 identifies the light amount reduction amount of the light source 91 from the calculated light amount difference. For example, a database of a reduction amount of the light source 91 corresponding to the difference between the detected light amount and a predetermined value is stored in the storage unit 63 in advance. The control unit 60 specifies the reduction amount of the light source 91 with reference to the data table of the reduction amount of the light source 91 stored in advance. And the control part 60 makes the control signal transmission part 50 produce | generate a control signal based on the specified reduction amount, and reduces the light quantity of the light source 91. FIG. And the control part 60 judges whether it is necessary to reduce further from the light quantity after reducing. If further reduction is required, the amount of light is reduced with reference to the data table of the reduction amount of the light source 91. If there is no need for further reduction, the light amount adjustment is terminated.

  Note that the light amount of the light source 91 may be reduced by a predetermined amount step by step. Specifically, it is reduced by a predetermined amount determined in advance, measured after the reduction, and it is determined whether or not the value has become a predetermined value or less. If it is not less than the predetermined value, the light amount is further reduced by a predetermined amount for measurement. You may perform this until it becomes below a predetermined value.

  Alternatively, the light amount of the light source 91 is continuously reduced. In this case, the control unit 60 receives the detected light amount from the outside light detection unit 40 at all times. The control unit 60 reduces the light amount until the received light amount becomes a predetermined value or less. The control unit 60 ends the light amount adjustment when the received light amount becomes equal to or less than various values.

  The predetermined value is determined from the amount of light on the screen 11. When the light from the lighting device 90 having a light amount larger than the light amount of the screen 11 hits, the light of the screen 11 is scattered by the light, and there is a high possibility that it cannot be seen. Conversely, when light from the lighting device 90 having a light amount smaller than the light amount of the screen 11 is applied, the light of the screen 11 is not scattered by the light. Therefore, the predetermined value is the amount of light on the screen 11, and the predetermined value is stored in the storage unit 63. This predetermined value can be changed by the user A. For example, when the amount of light on the screen is changed, the changed amount of light is set to a predetermined value. Or it is good also considering the average light quantity of a product as a predetermined value.

  Next, the operation of the display device will be described with reference to FIG.

  User A turns on the display device. The control unit 60 displays an image on the screen 11. At the same time, the line sensors 40L and 40R detect whether or not external light is applied. When detecting that external light is applied, the control unit 60 starts light amount adjustment of the light source 91 of the illumination device 90 (S100).

  First, the control part 60 specifies the light quantity of the light source 91 of the illuminating device 90 (S105). When the light amount of the light source 91 of the illumination device 90 is smaller than the predetermined value, the light amount adjustment of the light source 91 of the illumination device 90 is finished because there is no need to change the light amount of the light source 91 (N in S105).

  When the light quantity of the light source 91 is larger than a predetermined value, the existence ranges of a plurality of users A are specified. The user detection unit 30 captures the front of the display device (S110) and outputs the captured user image to the control unit 60. The control unit 60 performs pattern matching between the captured user image and the face image stored in the storage unit 6, and specifies the position of the face of each user A (S120). Then, the angles β1 and β2 related to the existence range are identified from the identified individual user A face positions (S130).

  The control unit 60 specifies the angles β1 and β2 and simultaneously calculates the incident angle α of light from the lighting device 90 that hits the screen 11. Then, the control unit 60 calculates the reflection angle θ from the calculated incident angle α.

  The control unit 60 determines whether or not the reflected light strikes each user A from the calculated reflection angle θ (S135). When the reflected light does not fall within the range of angles β1 and β2, that is, within the existing range, it is not necessary to change the light amount of the light source 91, and thus the light amount adjustment of the light source 91 of the illumination device 90 ends (N in S135).

  When the reflected light falls within the existing range (Y in S135), the light quantity of the light source 91 of the lighting device 90 needs to be changed, so the control unit 60 refers to the data table of the reduction amount of the light source 91 to refer to the light source 91. The amount of light of the light source 91 is adjusted so that the amount of light is less than a predetermined value.

  The controller 60 controls the control signal transmitter 50 based on the predetermined value to reduce the light amount of the light source 91 (S140). And the control part 60 complete | finishes the light quantity adjustment of the light source 91 of the illuminating device 90. FIG.

  Thereby, even if it is a case where the screen 11 becomes difficult to see from the some user A with the light quantity of the light source 91, a display apparatus changes the light quantity of the light source 91, and prevents reflected light from hitting each user A. Therefore, the image can always be shown to each user A.

  In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention.

  In the present embodiment, the case where the external light is a lighting device has been described. However, the present invention is not limited to this, and sunlight may be used. In this case, for example, a shielding member such as a filter or a curtain is arranged between the sunlight and the screen, and the amount of sunlight is adjusted by controlling the shielding object when the light quantity is a predetermined value or more. Thereby, it is possible to prevent the reflected light from hitting the user and to always show the image to the user.

  In the present embodiment, two line sensors are provided in order to accurately specify the external light angle. However, one line sensor is provided in the center, and the external light is detected depending on the angle detected by one of the line sensors. An angle may be specified.

Overall front view showing a display device according to the present invention Block diagram showing a display device Configuration diagram of touch panel Schematic side view of external light detector It is the image data imaged with the user detection part, Comprising: (a) is a figure which shows a picked-up image, (b) is a figure which shows the example of the recognition result of the position of the identified user's face The figure which shows the relationship between the coordinate of the position of the identified user's face, and the angle of the existence range with respect to a display part Schematic side view when the user detector receives external light The figure which shows the direction of the reflected light of the light from the lighting equipment It is a figure which shows the strength of the light quantity of the light source of an illuminating device, Comprising: (a) is a figure which shows the direction of reflected light when a light quantity is large, (b) is a figure which shows the direction of reflected light when a light quantity is small Flow chart of operation of display device

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display part 11 Screen 12 Touch panel 13x X direction LED array 13y Y direction LED array 14x X direction phototransistor array 14y Y direction phototransistor array
20 pedestal 21 base 22 support base 23 leg 30 user detection unit 40 external light detection unit 40L line sensor L
40R Line sensor R
41 condensing part 50 control signal transmission part 60 control part 61 CPU
62 Memory 63 Storage 64 LCD Controller 70 Printer 80 Scanner 90 Illumination Equipment 91 Light Source 92 Light Source Controller

Claims (9)

A display unit having a screen for displaying an image; an external light detection unit for detecting external light hitting the screen; a user detection unit for detecting the positions of a plurality of users viewing the screen; and And a control unit that changes the amount of the external light so as not to be affected by light. The control unit calculates a direction of reflected light from incident light of external light on the screen, and changes the amount of the external light when the direction of the reflected light is directed to a user's position. The display device according to 1. External light is emitted from a lighting device in front of the display unit,
The display device according to claim 2, wherein the control unit controls a light amount of the lighting device. The display device according to claim 1, wherein the control unit specifies an existing range in which the user exists from a plurality of user positions. The user detection unit includes an image sensor that images the front of the display unit,
The control unit recognizes each user from the image, identifies the position of the user, and determines the existence range based on the users located on the left and right from the position of the user. The display device described in 1. The external light detection unit detects the peak position on the screen that is exposed to external light,
The display device according to claim 1, wherein the control unit calculates an incident angle of the external light from the peak position. The external light detection unit detects the light amount at the peak position,
The control unit according to claim 6, wherein the control unit changes the amount of external light when the light amount is equal to or greater than a predetermined value, and stops changing the amount of external light when the light amount is less than the predetermined value. Display device. The external light detection unit includes a plurality of line sensors that receive external light,
The display device according to claim 7, wherein the line sensors are arranged at both ends in the left-right direction of the display unit. The display device according to claim 8, wherein the external light detection unit includes a condensing unit that condenses external light falling from above the screen onto the line sensor.

Images