WO2022024870A1 - Display device and control method - Google Patents

Abstract

A display device (1) includes: a transparent display panel (13) for displaying an image; a light control sheet (15) which is overlaid on a rear surface side of the transparent display panel (13) and through which light is transmitted at a variable transmittance; an acquisition unit (22) for acquiring, as acquired information, information indicating the illuminance around the display device (1) or a signal input to the display device (1); and a control unit (23) for controlling the transmittance of the light control sheet (15) in accordance with the acquired information acquired by the acquisition unit (22).

Description

Display device and control method

This disclosure relates to a display device and a control method.

Conventionally, there is a display device equipped with a transparent display. This display device has a transparent display that displays an image by a transparent organic EL (electro-luminescence) element or an organic light-emitting diode (OLED) element, and is transmitted from the back side to the front side of the transparent display. It is equipped with a dimming sheet that adjusts the amount of light emitted.

For example, when the dimming sheet transmits light, the image displayed by the transparent display and the object on the back of the display device can be visually recognized by the user at the same time. Further, when the light control sheet blocks the light, the image displayed by the transparent display can be visually recognized by the user as a clear image without the intervention of external light. The display device is used, for example, as a display device for presenting AR (Augmented Reality).

Conventionally, a technique relating to a dimming sheet that controls light transmission based on the difference in illuminance between indoors and outdoors has been disclosed (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2018-18727

Conventionally, there is a problem that the visual effect of the content displayed on the transparent display is reduced.

The present disclosure provides a display device or the like that allows the user to visually recognize the content without deteriorating the visual effect.

The display device in the present disclosure is a transparent display panel for displaying an image and a dimming sheet provided on the back side of the transparent display panel, and the transmittance of light transmitted through the dimming sheet is variable. Depending on the acquisition unit that acquires information indicating the ambient illuminance of a certain dimming sheet and the display device, or the signal input to the display device as acquisition information, and the acquisition information acquired by the acquisition unit. A control unit for controlling the transmittance of the dimming sheet is provided.

The control method in the present disclosure is a control method for controlling a display device, and the display device is a transparent display panel for displaying an image and a dimming sheet provided on the back side of the transparent display panel. The control method includes information indicating the illuminance around the display device or a signal input to the display device, which comprises a light control sheet in which the transmittance of light transmitted through the light control sheet is variable. Is a control method including an acquisition step of acquiring the light as acquired information and a control step of controlling the transmittance of the dimming sheet according to the acquired information acquired in the acquisition step.

The display device in the present disclosure allows the user to visually recognize the content without deteriorating the visual effect.

FIG. 1 is an explanatory diagram showing the appearance of the display device according to the embodiment. FIG. 2 is an explanatory diagram showing the structure of the display panel according to the embodiment. FIG. 3 is a block diagram showing a functional configuration of the display device according to the embodiment. FIG. 4 is an explanatory diagram showing a first example of the illuminance sensor according to the embodiment. FIG. 5 is an explanatory diagram showing a second example of the illuminance sensor according to the embodiment. FIG. 6 is an explanatory diagram showing first control information used for controlling the transmittance with respect to the environmental illuminance or the background illuminance according to the embodiment. FIG. 7 is an explanatory diagram showing a second control information used for controlling the transmittance with respect to the environmental illuminance or the background illuminance according to the embodiment. FIG. 8 is an explanatory diagram showing first control information used for controlling the transmittance with respect to the average luminance according to the embodiment. FIG. 9 is an explanatory diagram showing second control information used for controlling the transmittance with respect to the average luminance according to the embodiment. FIG. 10 is an explanatory diagram showing a first example of instruction information according to an embodiment. FIG. 11 is an explanatory diagram showing a second example of instruction information according to the embodiment. FIG. 12 is a first explanatory view showing an image visually recognized by the user based on the control of the display device according to the embodiment. FIG. 13 is a second explanatory view showing an image visually recognized by the user based on the control of the display device according to the embodiment. FIG. 14 is a flow chart showing a control method of the display device according to the embodiment.

The inventor of the present application has found that the following problems occur with respect to the conventional display device.

A viewer (also referred to as a user) of a display device provided with a transparent display gazes at one or both of an image displayed on the transparent display and an object (also referred to as a background image) viewed through the transparent display. While visually recognizing the content.

The image displayed by the display device may be an image generated with the intention of paying attention to the image itself, or the user sees the image through the display device while displaying the image, not the image itself. It may be an image generated with the intention of gazing at the background image.

On the other hand, the display device can control whether or not the background image is visually recognized by the user by adjusting the transmittance of the dimming sheet.

Therefore, the display device adjusts the transmittance of the dimming sheet according to the intention of generating the image, which is whether to focus on the image itself or the background image, so that the user can use one or both of the image itself or the background image. It is required to encourage the attention of. If the user gazes at the image against the intention of generating the image, there is a problem that the visual effect of the content is deteriorated.

Further, depending on the illuminance of the environment in which the display device equipped with the transparent display is arranged or other conditions, it may be difficult for the user to visually recognize the image displayed on the transparent display. In that case, there is a problem that the user cannot properly visually recognize the image and the visual effect of the content is deteriorated.

Therefore, the present disclosure provides a display device or the like that allows the user to visually recognize the content without deteriorating the visual effect.

The display device according to one aspect of the present disclosure is a transparent display panel for displaying an image and a light control sheet provided on the back side of the transparent display panel, and is a transmission of light transmitted through the light control sheet. An acquisition unit that acquires information indicating the ambient illuminance of the dimming sheet having a variable rate and the ambient illuminance of the display device or a signal input to the display device as acquisition information, and the acquisition unit acquired by the acquisition unit. It is a display device including a control unit for controlling the transmittance of the dimming sheet according to the information.

According to the above aspect, the display device is the light transmitted from the back side to the front side of the display device by controlling the illuminance around the display device or the transmittance of the dimming sheet based on the signal input to the display device. Control the amount of. As a result, the display device controls whether the background image is transparent to the user or not. As a result, the user can visually recognize the content while appropriately gazing at the image or the background image according to the content. In this way, the display device can make the user visually recognize the content without deteriorating the visual effect.

For example, in the control of the transmittance, the control unit may set the transmittance of the light control sheet to any one of three or more predetermined transmittances.

According to the above aspect, the display device flexibly sets the degree of transmission of the background image by controlling the transmittance of the light control sheet in finer increments. As a result, the user can visually recognize the content while more flexibly changing whether to pay attention to the image or the background image according to the content, and can visually recognize the content while enjoying a high visual effect. can. In this way, the display device can make the user visually recognize the content without deteriorating the visual effect.

For example, the information indicating the illuminance around the display device includes the environmental illuminance which is the illuminance of the environment in which the display device is arranged, and the control unit has a high environmental illuminance in the control of the transmittance. The transmittance may be set to a low value.

According to the above aspect, the display device reduces the degree of transparency of the background image that is visible to the user through the display device when the illuminance of the environment in which the display device is arranged is relatively high, so that the user can display the image on the image. You can be encouraged to watch. Further, when the illuminance of the environment in which the display device is arranged is relatively low, the display device increases the degree of transparency of the background image that is visible to the user through the display device, and the user pays close attention to the background image. Can be urged. In this way, the display device can make the user gaze at the appropriate one of the image and the background image based on the illuminance of the environment in which the display device is arranged. In this way, the display device can make the user visually recognize the content without deteriorating the visual effect.

For example, the information indicating the illuminance around the display device includes background illuminance, which is the illuminance of an object seen through the display device by a viewer who visually recognizes the display device, and the control unit has the transmittance. In the control of, the higher the background illuminance, the lower the transmittance may be set.

According to the above aspect, the display device reduces the degree of transparency of the background image that is seen by the user through the display device when the illuminance of the object (that is, the background) that the user sees through the display device is relatively high. And the user can be encouraged to look at the image. Further, when the illuminance of the background is relatively low, the display device can increase the degree of transparency of the background image seen by the user through the display device and encourage the user to pay attention to the background image. In this way, the display device can make the user gaze at an appropriate image or background image based on the illuminance of the background. In this way, the display device can make the user visually recognize the content without deteriorating the visual effect.

For example, the signal input to the display device includes a video signal input to the display device, and the control unit has a high average luminance of an image generated by the video signal in controlling the transmittance. The transmittance may be set to a small value.

According to the above aspect, when the average brightness of the image displayed by the transparent display is relatively high, the display device can reduce the transparency of the background image and encourage the user to pay attention to the image. Further, when the average brightness of the image displayed by the transparent display is relatively low, the display device can increase the transparency of the background image and encourage the user to pay attention to the background image. In general, the content to be displayed on a display device equipped with a transparent display expresses the image in a color relatively close to white when the image is to be watched, and the image is relatively black when the background image is to be watched. Express in close colors. By performing the above control on the display device, the user can be made to pay attention to the appropriate side of the image and the background image. In this way, the display device can make the user visually recognize the content without deteriorating the visual effect.

For example, the signal input to the display device includes a video signal input to the display device, and the control unit controls the transmittance by controlling the area of a character area of an image generated by the video signal. The larger the value, the smaller the transmittance is set, or the larger the area of the excluded area, which is the area excluding the black portion of the image generated by the video signal, the smaller the transmittance. It may be set to a value.

According to the above aspect, when the area of the character area or the exclusion area of the image displayed by the transparent display is relatively large, the display device reduces the transparency of the background image and encourages the user to pay attention to the image. Can be done. Further, when the area of the character area or the exclusion area of the image displayed by the transparent display is relatively small, the display device can increase the transparency of the background image and encourage the user to pay attention to the background image. Generally, the character area or exclusion area is expected to be watched by the user. By performing the above control on the display device, the user can be made to pay attention to the appropriate side of the image and the background image. In this way, the display device can make the user visually recognize the content without deteriorating the visual effect.

For example, the signal input to the display device includes instruction information input to the display device to indicate the transmittance to be set in the dimming sheet, and the control unit controls the transmittance. In, the transmittance may be set according to the instruction information.

According to the above aspect, the display device can make the user gaze at the appropriate one of the image and the background image according to the instruction information. In this way, the display device can make the user visually recognize the content without deteriorating the visual effect.

For example, when the acquired information acquired by the acquisition unit changes, the control unit may dynamically control the transmittance based on the acquired information after the change.

According to the above aspect, when the acquired information changes, the display device sets the transmittance of the dimming sheet according to the change of the acquired information. As a result, the display device can dynamically follow the change of the acquired information and make the user gaze at the appropriate one of the image and the background image. In this way, the display device can make the user visually recognize the content without deteriorating the visual effect.

The control method according to one aspect of the present disclosure is a control method for controlling a display device, wherein the display device is provided so as to overlap a transparent display panel for displaying an image and a rear side of the transparent display panel. The optical sheet includes a light control sheet in which the transmittance of light transmitted through the light control sheet is variable, and the control method is based on information indicating the illuminance around the display device or the display device. It is a control method including an acquisition step of acquiring an input signal as acquisition information and a control step of controlling the transmittance of the dimming sheet according to the acquisition information acquired in the acquisition step.

According to the above aspect, the control method has the same effect as the above display device.

Hereinafter, embodiments will be described with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art.

It should be noted that the inventor of the present application provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the subject matter described in the claims by these. No.

(Embodiment)
In the present embodiment, a display device that allows the user to visually recognize the content without deteriorating the visual recognition effect will be described.

FIG. 1 is an explanatory diagram showing the appearance of the display device 1 according to the present embodiment. FIG. 1 shows the appearance of the display device 1 in a used state.

As shown in FIG. 1, the display device 1 includes a display panel 10 and a frame body 30.

The display panel 10 is a display device capable of displaying an image. The display panel 10 is realized, for example, by arranging transparent light emitting elements two-dimensionally.

The display panel 10 displays an image by displaying pixels of colors corresponding to the video signal input to the display device 1. Further, the display panel 10 does not display pixels when the color to be displayed according to the video signal is black. Not displaying pixels may be expressed as displaying transparent or colorless pixels.

The frame body 30 is a rigid member that supports the display panel 10. The frame 30 surrounds the outer periphery of the display panel 10 (that is, the upper end, the lower end, the left end, and the right end), and supports the display panel 10 so that the display panel 10 maintains the posture in the used state. The material of the frame 30 may be any material such as metal, wood, and synthetic resin. Further, the frame body 30 does not necessarily have to support the entire outer circumference of the display panel 10.

As shown in FIG. 1, the side of the display panel 10 where the user U who visually recognizes the content by the display device 1 exists is also referred to as a front side, and the side opposite to the front side is also referred to as a back side. In addition, the direction may be expressed using each of the up, down, left, and right directions shown in FIG.

FIG. 2 is an explanatory diagram showing the structure of the display panel 10 according to the present embodiment.

As shown in FIG. 2, the display panel 10 includes a glass plate 12, a transparent display panel 13, a glass plate 14, a dimming sheet 15, and a glass plate 16, which are on the front side in the above order. It is stacked from the back side toward the back side and supported by the frame body 30.

The glass plate 12 is a transparent glass plate arranged on the front side of the transparent display panel 13. The glass plate 12 supports the transparent display panel 13 from the front side and protects the transparent display panel 13.

The transparent display panel 13 is a display panel that displays pixels on a transparent glass substrate. The transparent display panel 13 is, for example, an organic EL panel having a plurality of organic EL elements arranged on a transparent glass substrate. The organic EL element is, for example, an OLED element, and this case will be described as an example, but the present invention is not limited to this.

The transparent display panel 13 displays an image by displaying pixels of colors corresponding to the video signal input to the display device 1. The colors are represented by red, blue and green gradations (eg, 256 gradations). White pixels are displayed when red, blue and green have the highest gradation values, while pixels are not displayed when red, blue and green have the lowest gradation values.

The glass plate 14 is a transparent glass plate that is on the back side of the transparent display panel 13 and is arranged on the front side of the dimming sheet 15. The glass plate 14 supports the transparent display panel 13 from the back side and protects the transparent display panel 13. Further, the glass plate 14 supports the dimming sheet 15 from the front side and protects the dimming sheet 15.

The dimming sheet 15 is provided so as to be overlapped on the back side of the transparent display panel 13, and the transmittance of the light transmitted through the dimming sheet 15 is variable. The transmittance of the dimming sheet 15 is set and controlled by the control unit 23 (described later). The transmittance of the dimming sheet 15 can be expressed as a percentage, for example, 0%, 50% or 100%.

Here, 0% indicates the transmittance when the amount of light transmitted by the dimming sheet 15 is minimized within the settable range, and the dimming sheet 15 does not necessarily transmit light at all. It doesn't just show that. Similarly, 100% indicates the transmittance (limit transmittance) when the amount of light transmitted by the dimming sheet 15 is maximized within the settable range, and the dimming sheet 15 does not necessarily have to be the dimming sheet 15. It does not just indicate that it is completely transparent.

The dimming sheet 15 is composed of, for example, a liquid crystal layer containing liquid crystal molecules whose orientation state is changed depending on the presence or absence of voltage application, and a resin sheet sandwiching the liquid crystal layer. The transmittance of the light control sheet 15 can be set according to the voltage applied to the light control sheet 15. The transmittance of the light control sheet 15 is set to one value for the entire light control sheet 15.

The light transmitted through the dimming sheet 15 includes light transmitted from the front side to the back side and light transmitted from the back side to the front side. Here, whether or not the user U visually recognizes the background image. The light transmitted from the back side to the front side related to the above will be described.

When the transmittance of the light control sheet 15 is relatively low, the amount of light transmitted through the light control sheet 15 is small, so that the user U cannot see the background image at all, or can see it through a little. On the other hand, when the transmittance of the light control sheet 15 is relatively high, the amount of light transmitted through the light control sheet 15 is large, so that the user U can visually recognize the background image through the light control sheet 15.

The glass plate 16 is a transparent glass plate arranged on the back side of the dimming sheet 15. The glass plate 16 supports the dimming sheet 15 from the back surface side and protects the dimming sheet 15.

Next, the function of the display device 1 will be described.

FIG. 3 is a block diagram showing a functional configuration of the display device 1 according to the present embodiment.

As shown in FIG. 3, the display device 1 includes an input unit 21, an acquisition unit 22, a control unit 23, a transparent display panel 13, and a dimming sheet 15. The input unit 21, the acquisition unit 22, and the control unit 23 can be realized by using a processor (for example, a CPU (Central Processing Unit)) included in the display device 1. Since the transparent display panel 13 and the dimming sheet 15 are as described above, the description thereof is omitted here.

The input unit 21 is a functional unit to which a video signal is input, and may include a terminal for receiving the video signal. A video signal of a predetermined format indicating an image to be displayed by the display device 1 is input to the input unit 21. The video signal includes, for example, a signal indicating an image to be displayed at a frame rate of 30 fps. The format of the video signal is, for example, HDMI (registered trademark) (High-Definition Multimedia Interface), but is not limited thereto. The input unit 21 generates image data related to an image to be displayed on the transparent display panel 13 based on the input video signal, and provides the generated image data to the transparent display panel 13.

Further, the input unit 21 may further input a signal including instruction information indicating the transmittance to be set on the dimming sheet 15.

The acquisition unit 22 is a functional unit that acquires information indicating the illuminance around the display device 1 or a signal input to the display device 1. The information acquired by the acquisition unit 22 is also referred to as acquisition information.

The information indicating the illuminance around the display device 1 is, for example, the environmental illuminance indicating the illuminance of the environment in which the display device 1 is arranged, or an object that the viewer who visually recognizes the display device 1 sees through the display device 1. Includes background illuminance indicating the illuminance of (that is, the background image). The signal input to the display device 1 includes, for example, a video signal or instruction information indicating the transmittance to be set on the dimming sheet 15.

The control unit 23 is a functional unit that controls the transmittance of the dimming sheet 15 according to the acquisition information acquired by the acquisition unit 22. The control unit 23 may control the transmittance of the dimming sheet 15 by setting it to one of two transmittances, 0% and 100%, as an example.

Further, the control unit 23 may control the transmittance of the dimming sheet 15 by setting it to one of a predetermined transmittance of 3 or more. The predetermined three or more transmittances can be, for example, three predetermined transmittances, specifically 0%, 100%, and a transmittance greater than 0% and less than 100% (eg, 50%). ) Can be the three transmittances. Further, the predetermined transmittance of 3 or more can be a transmittance expressed by a continuous value in the range of 0% or more and 100% or less.

The control unit 23 has, for example, the transmittance of the dimming sheet 15 according to the ambient illuminance or the background illuminance, the average luminance of the image obtained from the video signal (generally also referred to as APL (Average Picture Level)), or the instruction information. To control. The control using the above information will be described in detail later.

Note that the control unit 23 may dynamically control the transmittance based on the acquired information after the change when the acquired information acquired by the acquisition unit 22 changes. In other words, when the acquired information changes, the control unit 23 may dynamically set the transmittance of the dimming sheet 15 in accordance with the change in the acquired information.

Next, the information indicating the illuminance around the display device 1 acquired by the acquisition unit 22 will be described. The illuminance around the display device 1 includes (1) environmental illuminance or (2) background illuminance, and is acquired by the illuminance sensor.

(1) Environmental illuminance FIG. 4 is an explanatory diagram showing an illuminance sensor 31 which is a first example of the illuminance sensor according to the present embodiment. The illuminance sensor 31 is a sensor that measures the environmental illuminance, which is the illuminance of the environment in which the display device 1 is arranged.

As shown in FIG. 4, the illuminance sensor 31 is fixedly installed on the upper surface of the frame 30 of the display device 1, for example. Light emitted toward the display device 1 is incident on the illuminance sensor 31 from a relatively wide range above the display device 1. The illuminance sensor 31 receives the light radiated to the display device 1 from above the display device 1, and acquires the amount of the received light as the environmental illuminance.

The illuminance sensor 31 is composed of a Cds (cadmium sulfide) cell, a photodiode, a phototransistor, or the like.

The position where the illuminance sensor 31 is installed is not limited to the upper surface of the frame body 30, and may be the left side surface or the right side surface of the frame body 30, or a position away from the display device 1 and near the display device 1. It may be in the position of.

(2) Background Illuminance FIG. 5 is an explanatory diagram showing an illuminance sensor 32 which is a second example of the illuminance sensor according to the present embodiment. The illuminance sensor 32 is a sensor that measures the background illuminance, which is the illuminance of an object that the user U sees through the display device 1.

As shown in FIG. 5, the illuminance sensor 32 is fixedly installed on the frame 30 on the upper surface of the display device 1, for example. The light emitted from the object 34 that the user U sees through the display device 1 toward the display device 1 is incident on the illuminance sensor 32. The illuminance sensor 32 receives the light emitted from the object 34 toward the display device 1, and acquires the amount of the received light as the background illuminance.

The illuminance sensor 32 is composed of a cylinder and a Cds (cadmium sulfide) cell, a photodiode, a photodiode, or the like arranged inside the cylinder.

The tubular body is arranged in a direction parallel to the optical path of the light emitted from the object 34 toward the display device 1, thereby blocking the light traveling in the optical path other than the optical path. By blocking the light traveling in the optical path other than the optical path, the illuminance sensor 32 can acquire the amount of the light traveling in the optical path, so that the directivity of sensing is improved. As a result, the light emitted toward the display device 1 from a relatively narrow range, including the light emitted from the object 34 toward the display device 1, is incident on the illuminance sensor 32.

The position where the illuminance sensor 32 is installed is the same as the position of the illuminance sensor 31.

Next, the control of the transmittance of the dimming sheet 15 by the control unit 23 will be described.

The control unit 23 controls the transmittance of the dimming sheet 15 according to the acquired information acquired by the acquisition unit 22, and more specifically, (1) environmental illuminance or background illuminance, and (2) average brightness of the image. , The area of the character area or the exclusion area, or (3) according to the instruction information. These will be described in detail below.

(1) Environmental illuminance or background illuminance Here, a case where the control unit 23 controls the transmittance of the dimming sheet 15 according to the environmental illuminance will be described as an example, but the same description holds for the background illuminance.

FIG. 6 is an explanatory diagram showing the first control information used for controlling the transmittance with respect to the environmental illuminance or the background illuminance according to the present embodiment.

In the control information shown in FIG. 6, the environmental illuminance acquired by the acquisition unit 22 is shown on the horizontal axis, and the transmittance set by the control unit 23 according to the environmental illuminance is shown on the vertical axis.

Specifically, in the control information shown in FIG. 6, the higher the environmental illuminance, the lower the transmittance is associated. Further, the environmental illuminance is divided into three ranges (high, medium and low) by two threshold values (threshold values T1 and T2), and the transmittance (0%, 50% and 100) is divided for each of the three categories of environmental illuminance. %) Is associated.

When the acquisition unit 22 acquires the environmental illuminance, the control unit 23 determines the transmittance to be set in the dimming sheet 15 using the control information, and sets the determined transmittance in the dimming sheet 15. .. As a result, the control unit 23 sets the transmittance of the dimming sheet 15 to a lower value as the environmental illuminance acquired by the acquisition unit 22 increases.

Similarly, when the acquisition unit 22 acquires the background illuminance, the control unit 23 determines the transmittance to be set in the dimming sheet 15 using the control information, and sets the determined transmittance to the dimming sheet 15. Set to. As a result, the control unit 23 sets the transmittance of the dimming sheet 15 to a lower value as the background illuminance acquired by the acquisition unit 22 increases.

FIG. 7 is an explanatory diagram showing a second control information used for controlling the transmittance with respect to the environmental illuminance or the background illuminance according to the present embodiment.

In the control information shown in FIG. 7, the environmental illuminance acquired by the acquisition unit 22 is shown on the horizontal axis, and the transmittance set by the control unit 23 according to the environmental illuminance is shown on the vertical axis.

Specifically, in the control information shown in FIG. 7, the higher the environmental illuminance, the lower the transmittance is associated. Further, in the control information, the transmittance is associated with each of the environmental illuminances as continuous values without providing the division as shown in FIG. Then, the environmental illuminance and the transmittance are associated with each other because the transmittance is monotonically decreased with respect to the environmental illuminance.

The control unit 23 sets the transmittance of the dimming sheet 15 based on the environmental illuminance or the background illuminance, as in the case of FIG.

(2) Average Luminance of Image, Area of Character Area or Exclusion Area FIG. 8 is an explanatory diagram showing first control information used for controlling the transmittance with respect to the average luminance according to the present embodiment.

In the control information shown in FIG. 8, the average brightness of the image obtained from the video signal acquired by the acquisition unit 22 is shown on the horizontal axis, and the transmittance set by the control unit 23 according to the average brightness is on the vertical axis. It is shown in.

Specifically, in the control information shown in FIG. 8, the higher the average brightness, the lower the transmittance is associated with. In addition, the average brightness is divided into three ranges (high, medium, and low) by two thresholds (thresholds T3 and T4), and the transmittance (0%, 50%, and 100) is divided for each of the three categories of average brightness. %) Is associated.

When the acquisition unit 22 acquires the average brightness, the control unit 23 determines the transmittance to be set in the dimming sheet 15 using the control information, and sets the determined transmittance in the dimming sheet 15. .. As a result, the control unit 23 sets the transmittance of the dimming sheet 15 to a lower value as the average brightness acquired by the acquisition unit 22 is higher.

FIG. 9 is an explanatory diagram showing a second control information used for controlling the transmittance with respect to the average luminance according to the present embodiment.

In the control information shown in FIG. 9, the average brightness acquired by the acquisition unit 22 is shown on the horizontal axis, and the transmittance set by the control unit 23 according to the average brightness is shown on the vertical axis.

Specifically, in the control information shown in FIG. 9, the higher the average brightness, the lower the transmittance is associated with. Further, in the control information, the transmittance is associated with each of the average luminance as a continuous value without providing the division as shown in FIG. Then, the average brightness and the transmittance are associated with each other because the transmittance is monotonically decreased with respect to the average brightness.

The control unit 23 sets the transmittance of the dimming sheet 15 based on the average luminance, as in the case of FIG.

Further, the control unit 23 can also control the transmittance according to the area of the character area included in the image obtained from the video signal acquired by the acquisition unit 22. Here, the character area is an area of the image in which characters are displayed. The area of the character area can be obtained, for example, by extracting the character area by a process of extracting characters included in the image and calculating the area of the extracted character area. The area of the character area can be included in the acquired information.

The control unit 23 controls so that the larger the area of the character area, the lower the transmittance. In other words, in the control information shown in FIG. 8 or 9, the horizontal axis corresponds to reading the area of the character area of the image.

Note that the character dimensions can be used instead of the area of the character area. The control unit 23 controls so that the larger the size of the character, the lower the transmittance. In other words, in the control information shown in FIG. 8 or 9, the horizontal axis corresponds to reading the dimensions of the characters in the image.

Further, the control unit 23 can also control the transmittance according to the area of the exclusion region included in the image obtained from the video signal acquired by the acquisition unit 22. Here, the exclusion area is an area in which the black portion of the image is excluded. The area of the exclusion region can be obtained, for example, by calculating the area for displaying a color other than black contained in the image. The area of the excluded area may be included in the acquired information.

The control unit 23 controls so that the larger the area of the exclusion region, the lower the transmittance. In other words, in the control information shown in FIG. 8 or 9, the horizontal axis corresponds to reading the area of the exclusion area of the image.

(3) Instruction Information FIG. 10 is an explanatory diagram showing a first example of instruction information according to the present embodiment. The instruction information is, for example, information in which the transmittance of the dimming sheet 15 at an arbitrary timing is predetermined according to the progress of the content, but the instruction information is not limited to this.

FIG. 10 shows changes in the instruction information with respect to the elapsed time. Here, the instruction information is information indicating the transmittance to be set on the dimming sheet 15, and can be any of three transmittances (0%, 50%, and 100%).

In FIG. 10, the transmittance is 100% in the period from time t1 to time t2, the transmittance is 50% in the period from time t2 to time t3, and the transmittance is 0% in the period from time t3 to time t4. Instructional information indicating that is shown.

When the control unit 23 acquires the instruction information shown in FIG. 10, the control unit 23 determines the transmittance according to the acquired instruction information. Further, when the instruction information changes with the passage of time, the control unit 23 determines the transmittance according to the changed instruction information.

FIG. 11 is an explanatory diagram showing a second control of the transmittance based on the instruction information according to the present embodiment.

FIG. 11 shows changes in the instruction information with respect to the elapsed time. Here, the instruction information is information indicating the transmittance to be set on the dimming sheet 15, and can take a continuous value in the range of 0% to 100%.

The instruction information shown in FIG. 11 has a transmittance of 100% at time ta, gradually decreases the transmittance from time ta to time tb, sets the transmittance to 0% at time tb, and gradually decreases from time tb to time tk. It is instruction information which shows that the transmittance is increased to 100% at time ct.

When the control unit 23 acquires the instruction information shown in FIG. 11, the control unit 23 determines the transmittance according to the acquired instruction information. Further, when the instruction information changes with the passage of time, the control unit 23 determines the transmittance according to the changed instruction information.

Next, an image visually recognized by the user U by displaying an image and controlling dimming by the display device 1 will be described. Here, an example will be described in which control is performed in which the transmittance of the dimming sheet 15 is set to a smaller value as the average brightness increases according to the average brightness of the image.

First, the image data of the video configured for AR will be explained.

The image data showing the image configured for AR has the intention of generating the image, such as an image expressing a human being, an object, a character, etc., in which the user U wants to gaze at the image itself. There may be an intention to have the user U gaze at the background image in a part or all of the image.

When the user U intends to gaze at the image itself, the image is expressed using a relatively bright color (in other words, a color relatively close to white). This is because a relatively dark color (in other words, a color relatively close to black) is expressed as a transparent color and is not visible to the user U. On the other hand, when the user U intends to gaze at the background image, the portion is expressed by using a relatively dark color (in other words, a color relatively close to black).

FIG. 12 is a first explanatory diagram showing an image visually recognized by the user U based on the control of the display device 1 according to the present embodiment.

FIG. 12 shows a background image 41, a dimming sheet 15A, an image 43, and an image 45.

The background image 41 is an image of an object existing ahead of the display device 1 when viewed from the user U. The background image 41 is an image seen by the user U through the transparent display panel 13 and the dimming sheet 15 if the transparent display panel 13 and the dimming sheet 15 of the display device 1 are transparent. ..

The dimming sheet 15A shows the dimming sheet 15 in a state of being set to a relatively low transmittance (for example, about 0% to 5%). The dimming sheet 15A is in a state of being controlled to a relatively low transmittance by the control unit 23 based on the fact that the average luminance of the image 43 (described later) is relatively high.

The image 43 is an image displayed by the transparent display panel 13 according to the video signal input to the display device 1. The image 43 is an example of an image generated with the intention of making the image gaze.

Image 43 includes an illustration of a female who is an explainer and a balloon image showing the content "ABC ..." spoken by the female. The background of the image 43 is white, and the margin inside the balloon image is also white. As described above, the image 43 has a relatively high average luminance because most of the parts of the image 43 are white or a color relatively close to white.

The image 45 is an image visually recognized by the user U by the display device 1. The image 45 includes the image 43 in a manner that is easily visible to the user U, and the background image 41 is included in a manner that the background image 41 is slightly transparent and visible to the user U. Since the transmittance of the dimming sheet 15 arranged on the back side of the transparent display panel 13 is set to a relatively low value, the amount of light transmitted from the back side to the front side of the transparent display panel 13 is kept low. Be done. Therefore, the transmission of the background image 41 is suppressed to the extent that the background image 41 is slightly transparent and can be visually recognized by the user U. As a result, the user U gazes at the image 43.

When the image 43, which is shown in FIG. 12 and is generated with the intention of making the image gaze, is displayed, the brightness or contrast of the image displayed on the transparent display panel 13 is further increased. You may. This is to encourage the user U to pay more attention to the image 43.

FIG. 13 is a second explanatory view showing an image visually recognized by the user U based on the control of the display device 1 according to the present embodiment.

FIG. 13 shows a background image 41, a dimming sheet 15B, an image 53, and an image 55.

The background image 41 is the same as the background image 41 shown in FIG.

The dimming sheet 15B shows the dimming sheet 15 in a state of being set to a relatively high transmittance (for example, about 95% to 100%). The light control sheet 15B is in a state of being controlled to a relatively high transmittance by the control unit 23 based on the fact that the average luminance of the image 53 (described later) is relatively low.

The image 53 is an image displayed by the transparent display panel 13 according to the video signal input to the display device 1. The image 53 is an example of an image generated with the intention of making the background image gaze when the image is displayed.

Image 53 contains only an illustration of a female who is an explainer. The background of the image 53 is black. As described above, the image 53 has a relatively low average luminance because most of the image 53 is composed of black.

The image 55 is an image visually recognized by the user U by the display device 1. The image 55 includes an illustration of a female included in the image 53 in a manner that is easily visible to the user U. Further, the portion of the image 55 other than the above illustration is included in such a manner that the background image 41 can be seen through by the user U. Since the transmittance of the dimming sheet 15 arranged on the back side of the transparent display panel 13 is set to a relatively high value, the amount of light transmitted from the back side to the front side of the transparent display panel 13 is large. As a result, the transmission of the background image 41 becomes dominant, in other words, the background image 41 included in the image 55 is easier for the user U to see than the background image 41 included in the image 45 of FIG. Then, the user U will gaze at the background image 41.

When the image 53, which is shown in FIG. 13 and is generated for the purpose of gazing at the background image, is displayed, the brightness of the image displayed on the transparent display panel 13 may be further lowered or the contrast may be lowered. You may. This is to encourage the user U to pay more attention to the background image.

FIG. 14 is a flow chart showing a control method of the display device 1 according to the present embodiment.

As shown in FIG. 14, in step S101, the acquisition unit 22 acquires information indicating the illuminance around the display device 1 or information input to the display device 1 as acquisition information.

In step S102, the control unit 23 controls the transmittance of the dimming sheet 15 according to the acquired information acquired in step S101.

By a series of processes shown in FIG. 14, the display device 1 can make the user U visually recognize the content without deteriorating the visual effect.

As described above, an embodiment has been described as an example of the technology in the present disclosure. To that end, the accompanying drawings and detailed description are provided.

Therefore, among the components described in the attached drawings and the detailed description, not only the components essential for solving the problem but also the components not essential for solving the problem in order to exemplify the above-mentioned technology. Can also be included. Therefore, the fact that those non-essential components are described in the accompanying drawings or detailed description should not immediately determine that those non-essential components are essential.

Further, since the above-described embodiment is for exemplifying the technology in the present disclosure, various changes, replacements, additions, omissions, etc. can be made within the scope of the claims or the equivalent thereof.

This disclosure is applicable to a television receiver, a display, or an image display device such as digital signage.

1 Display device 10 Display panel 12, 14, 16 Glass plate 13 Transparent display panel 15, 15A, 15B Dimming sheet 21 Input unit 22 Acquisition unit 23 Control unit 30 Frame body 31, 32 Illuminance sensor 34 Object 41 Background image 43, 53 Image 45, 55 Image U User

Claims (9)

1. It ’s a display device,
   A transparent display panel that displays images and
   A dimming sheet that is stacked on the back side of the transparent display panel and has a variable transmittance of light transmitted through the dimming sheet, and a dimming sheet.
   An acquisition unit that acquires information indicating the illuminance around the display device or a signal input to the display device as acquisition information.
   A display device including a control unit that controls the transmittance of the dimming sheet according to the acquisition information acquired by the acquisition unit.
2. The display device according to claim 1, wherein the control unit sets the transmittance of the dimming sheet to any of three or more predetermined transmittances in the control of the transmittance.
3. The information indicating the illuminance around the display device includes the environmental illuminance which is the illuminance of the environment in which the display device is arranged.
   The display device according to claim 1 or 2, wherein the control unit sets the transmittance to a lower value as the environmental illuminance is higher in the control of the transmittance.
4. The information indicating the illuminance around the display device includes background illuminance, which is the illuminance of an object seen through the display device by a viewer who visually recognizes the display device.
   The display device according to any one of claims 1 to 3, wherein the control unit sets the transmittance to a lower value as the background illuminance becomes higher in the control of the transmittance.
5. The signal input to the display device includes a video signal input to the display device.
   The display according to any one of claims 1 to 4, wherein the control unit sets the transmittance to a smaller value as the average brightness of the image generated by the video signal is higher in the control of the transmittance. Device.
6. The signal input to the display device includes a video signal input to the display device.
   The control unit controls the transmittance in the control.
   The larger the area of the character area of the image generated by the video signal, the smaller the transmittance is set or the better.
   The method according to any one of claims 1 to 5, wherein the larger the area of the excluded area, which is the area excluding the black portion, of the image generated by the video signal, the smaller the transmittance is set. Display device.
7. The signal input to the display device includes instruction information input to the display device to indicate the transmittance to be set in the dimming sheet.
   The display device according to claim 1 or 2, wherein the control unit sets the transmittance according to the instruction information in the control of the transmittance.
8. The item according to any one of claims 1 to 7, wherein the control unit dynamically controls the transmittance based on the acquired information after the change when the acquired information acquired by the acquisition unit changes. Display device.
9. It is a control method that controls the display device.
   The display device is
   A transparent display panel that displays images and
   A dimming sheet provided on the back side of the transparent display panel, the dimming sheet having a variable transmittance of light transmitted through the dimming sheet.
   The control method is
   An acquisition step of acquiring information indicating the illuminance around the display device or a signal input to the display device as acquisition information.
   A control method including a control step for controlling the transmittance of the dimming sheet according to the acquisition information acquired in the acquisition step.

Images