WO2022044960A1

WO2022044960A1 - Display device

Info

Publication number: WO2022044960A1
Application number: PCT/JP2021/030391
Authority: WO
Inventors: 修司山下; 久昇佐々木; 憲司持留; 功二寺脇
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2020-08-27
Filing date: 2021-08-19
Publication date: 2022-03-03

Abstract

A display device (2) comprises: a display panel (8); a dimming panel (10a) that is disposed facing the display panel (8) and that can be switched from one of a transmissive state and a reflective state to the other; a light-transmissive panel (12) that is disposed on the opposite side of the display panel (8) from the dimming panel (10a) so as to face the dimming panel (10a); a half-mirror (14) that is disposed facing the surface of the light-transmissive panel (12) on the dimming panel (10a) side and that has an aperture (40a) disposed facing the dimming panel (10a); and a control unit (50) that performs control to enable switching from one of an image display mode and a mirror mode to the other. The reflectance and the color of the half-mirror (14) are each substantially equal to the reflectance and the color of the dimming panel (10a) when the dimming panel (10a), which is held in a reflective state, is viewed through the aperture (40a).

Description

Display device

The present disclosure relates to a display device that can switch between an image display mode and a mirror mode.

Patent Document 1 discloses a display device that can switch between an image display mode and a mirror mode. This type of display device includes a display panel having a display surface for displaying an image, and a half mirror arranged so as to face the display surface of the display panel. On the back surface of the half mirror (the surface on the display panel side), in an area other than the area facing the display panel of the half mirror (hereinafter referred to as "first area") (hereinafter referred to as "second area"). Has a light-shielding layer.

In the image display mode, the image is displayed on the display surface of the display panel. This allows the user to see the image displayed on the display surface of the display panel through the first region of the half mirror.

Also, in the mirror mode, the image is hidden on the display surface of the display panel. As a result, a part of the external light incident on the front surface of the half mirror is reflected in the first region and the second region of the half mirror, so that the half mirror functions as a mirror for projecting the scenery in front of the half mirror. do.

Utility Model Registration No. 3196837 Gazette

The present disclosure provides a display device capable of suppressing reflection of external light in the image display mode and improving the appearance quality in the mirror mode.

The display device in the present disclosure has a display panel having a display surface for displaying an image, a transmission state in which the display panel is arranged facing the display surface and transmits incident light, and a reflection state in which incident light is reflected. A dimming panel that can be switched from one to the other, a translucent panel that is arranged on the opposite side of the display panel from the dimming panel so as to face the dimming panel, and a translucent panel. A half mirror arranged facing the surface of the optical panel on the dimming panel side and having an opening arranged facing the dimming panel, and a half mirror displaying an image on the display panel and dimming. The display panel and the dimming panel are controlled so as to switch from one of the image display mode that keeps the panel in the transparent state and the mirror mode that hides the image in the display panel and keeps the dimming panel in the reflective state. The reflectance and color of the half mirror are substantially equal to the reflectance and color of the dimming panel when the dimming panel held in the reflective state is viewed through the opening, respectively.

According to the display device in the present disclosure, it is possible to suppress reflection of external light in the image display mode and improve the appearance quality in the mirror mode.

FIG. 1 is a perspective view showing a display device according to the first embodiment. FIG. 2 is an exploded perspective view showing the display device according to the first embodiment. FIG. 3 is a cross-sectional view of a main part of the display device according to the first embodiment according to lines III-III of FIG. FIG. 4 is a schematic diagram for explaining the function of the dimming panel of the display device according to the first embodiment. FIG. 5 is a front view showing a translucent panel and a half mirror of the display device according to the first embodiment. FIG. 6 is a diagram showing an example of a method of processing a half mirror of the display device according to the first embodiment. FIG. 7 is a block diagram showing a functional configuration of the display device according to the first embodiment. FIG. 8 is a front view showing a display device according to the first embodiment in the image display mode. FIG. 9 is a front view showing the display device according to the first embodiment in the mirror mode. FIG. 10 is a perspective view showing a translucent panel and a half mirror of the display device according to the modified example of the first embodiment. FIG. 11 is a cross-sectional view of a main part of the display device according to the second embodiment. FIG. 12 is a cross-sectional view of a main part of the display device according to the third embodiment.

(Findings underlying this disclosure)
The present inventors have found that the following problems arise with respect to the technology described in the "Background technology" column.

In the conventional display device described above, a half mirror is always present in front of the display surface of the display panel. Therefore, in the image display mode, the user sees the image displayed on the display surface of the display panel through the first region of the half mirror. However, a large amount of external light is reflected in the first region of the half mirror, which causes a problem that the image becomes difficult to see.

Further, in the above-mentioned conventional display device, a light-shielding layer is arranged in the second region on the back surface of the half mirror. Therefore, in the mirror mode, the texture looks different between the first region and the second region of the half mirror, which causes a problem that the appearance quality of the display device is deteriorated.

Hereinafter, embodiments will be described in detail 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 inventors provide the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims by these. do not have.

(Embodiment 1)
[1-1. Display device structure]
First, the structure of the display device 2 according to the first embodiment will be described with reference to FIGS. 1 to 6. FIG. 1 is a perspective view showing a display device 2 according to the first embodiment. FIG. 2 is an exploded perspective view showing the display device 2 according to the first embodiment. FIG. 3 is a cross-sectional view of a main part of the display device 2 according to the first embodiment according to lines III-III of FIG. FIG. 4 is a schematic diagram for explaining the functions of the

dimming panels

10a and 10b of the display device 2 according to the first embodiment. FIG. 5 is a front view showing the translucent panel 12 and the half mirror 14 of the display device 2 according to the first embodiment. FIG. 6 is a diagram showing an example of a processing method of the half mirror 14 of the display device 2 according to the first embodiment.

In FIGS. 1 to 6, the width direction (horizontal direction) of the display device 2 is the X-axis direction, the depth direction (front-back direction) of the display device 2 is the Y-axis direction, and the height direction of the display device 2 (up and down). Direction) is the Z-axis direction. Further, in the present specification, the "front surface" means the surface on the minus side of the Y axis, and the "back surface" means the surface on the plus side of the Y axis. Further, in the present specification, "upper" means the plus side of the Z axis, and "lower" means the minus side of the Z axis.

As shown in FIGS. 1 and 2, the display device 2 includes a stand 4, a control box 6, a display panel 8,

dimming panels

10a and 10b, a translucent panel 12, and a half mirror 14. There is. The display device 2 is a so-called mirror display capable of switching between an image display mode and a mirror mode, which will be described later.

The stand 4 has a base portion 16, a frame body 18, and a rear cover 20. The base portion 16 is a member that serves as a base for the entire display device 2, and is placed on a floor surface or the like. The base portion 16 is formed in a substantially rectangular plate shape in XY top view. The frame body 18 is formed in a vertically long rectangular frame shape when viewed from the front of the XZ, and stands above the upper surface of the base portion 16. The rear cover 20 is formed in the shape of a vertically long rectangular plate when viewed from the front of the XZ, and is arranged so as to cover a part of the back surface side of the frame body 18.

The control box 6 is arranged facing the back surface of the rear cover 20. Inside the control box 6, a control circuit 22 for controlling the display panel 8 and the

dimming panels

10a and 10b is housed.

The display panel 8 is composed of various display panels such as a liquid crystal display (LCD: Liquid Crystal Display) panel or an organic EL (Electroluminescence) panel. The display panel 8 is formed in the shape of a vertically long rectangular plate when viewed from the front of the XZ. The display panel 8 is supported by the frame body 18 of the stand 4 and is arranged so as to face the front surface of the rear cover 20. A display surface 24 for displaying an image is formed on the front surface of the display panel 8. The "image" displayed on the display surface 24 of the display panel 8 may be either a still image or a moving image, or may be video content including both a still image and a moving image. The display panel 8 is electrically connected to the control circuit 22 in the control box 6 via the wiring cable 26.

Each of the

dimming panels

10a and 10b is a mirror LCD that can switch from one of the transmitted state that transmits the incident light and the reflected state that reflects the incident light to the other depending on the presence or absence of application of a predetermined voltage. .. Each of the

dimming panels

10a and 10b is formed in the shape of a rectangular plate when viewed from the front of the XZ. As shown in FIG. 3, each of the

dimming panels

10a and 10b is arranged so as to face the display surface 24 of the display panel 8 in a state of being vertically adjacent to each other. Here, the dimming

panels

10a and 10b are arranged so as to cover the entire area of the display surface 24 of the display panel 8. The display panel 8 and the

dimming panels

10a and 10b are bonded to each other by, for example, optical bonding using an optical adhesive such as OCA (Optical Clear Adaptive). The dimming

panels

10a and 10b are electrically connected to the control circuit 22 in the control box 6 via

wiring cables

28a and 28b, respectively.

As shown in FIG. 2, the dimming panel 10a has an active region 30a that can switch from one of the transmission state and the reflection state to the other, and a peripheral region 32a arranged around the active region 30a. The active region 30a is formed in a rectangular shape when viewed from the front of the XZ. The boundary portion between the active region 30a and the peripheral region 32a (indicated by a two-dot chain line in FIG. 2) is arranged inside the outer peripheral edge of the dimming panel 10a.

Further, as shown in FIG. 2, the dimming panel 10b has an active region 30b capable of switching from one of the transmission state and the reflection state to the other, and a peripheral region 32b arranged around the active region 30b. There is. The active region 30b is formed in a rectangular shape when viewed from the front of the XZ. The boundary portion between the active region 30b and the peripheral region 32b (indicated by a two-dot chain line in FIG. 2) is arranged inside the outer peripheral edge of the dimming panel 10b.

As shown in FIGS. 3 and 4, the dimming panel 10a includes an absorption-type polarizing plate 34a (an example of a first absorption-type polarizing plate), a liquid crystal optical element 36a, and a reflection-type polarizing plate 38a (first reflection-type polarization). An example of a plate) is laminated in this order. That is, the absorption-type polarizing plate 34a is arranged so as to face the reflection-type polarizing plate 38a, and the liquid crystal optical element 36a is laminated between the absorption-type polarizing plate 34a and the reflection-type polarizing plate 38a. The absorption-type polarizing plate 34a is arranged on the half mirror 14 side, and the reflection-type polarizing plate 38a is arranged on the display panel 8 side. The liquid crystal optical element 36a is composed of a TN (Twisted Nematic) liquid crystal element. The absorption type polarizing plate is also referred to as a transmission type polarizing plate.

As shown in FIG. 4, the dimming panel 10a is switched to the transmissive state when a predetermined voltage is applied to the liquid crystal optical element 36a. In this transmission state, the polarized light incident on the absorption-type polarizing plate 34a and transmitted through the absorption-type polarizing plate 34a becomes parallel to the transmission axis of the reflection-type polarizing plate 38a by transmitting the liquid crystal optical element 36a as it is, and is reflected. It passes through the type polarizing plate 38a and is emitted from the reflective polarizing plate 38a. As a result, in the transmitted state, the light incident on the front surface of the dimming panel 10a passes through the dimming panel 10a and is emitted from the back surface of the dimming panel 10a. At this time, the transmittance of the dimming panel 10a is, for example, about 75%.

Further, as shown in FIG. 4, the dimming panel 10a is switched to the reflection state when a predetermined voltage is not applied to the liquid crystal optical element 36a. In this reflection state, the polarized light incident on the absorption-type polarizing plate 34a and transmitted through the absorption-type polarizing plate 34a is twisted by 90 ° by the liquid crystal optical element 36a, so that the reflection axis (with the transmission axis) of the reflection-type polarizing plate 38a It becomes parallel to the vertical axis) and is reflected by the reflective polarizing plate 38a. The polarized light reflected by the reflective polarizing plate 38a becomes parallel to the transmission axis of the absorption type polarizing plate 34a by being twisted again by 90 ° by the liquid crystal optical element 36a, and is transmitted through the absorption type polarizing plate 34a to be absorbed type polarization. It is emitted from the plate 34a. As a result, in the reflected state, the light incident on the front surface of the dimming panel 10a is reflected inside the dimming panel 10a and emitted from the front surface of the dimming panel 10a.

As shown in FIGS. 3 and 4, the dimming panel 10b includes an absorption-type polarizing plate 34b (an example of a first absorption-type polarizing plate), a liquid crystal optical element 36b, and a reflection-type polarizing plate 38b (first reflection-type polarization). An example of a plate) is laminated in this order. That is, the absorption-type polarizing plate 34b is arranged so as to face the reflection-type polarizing plate 38b, and the liquid crystal optical element 36b is laminated between the absorption-type polarizing plate 34b and the reflection-type polarizing plate 38b. The absorption-type polarizing plate 34b is arranged on the half mirror 14 side, and the reflection-type polarizing plate 38b is arranged on the display panel 8 side. The liquid crystal optical element 36b is composed of a TN liquid crystal element.

As shown in FIG. 4, the dimming panel 10b is switched to the transmissive state when a predetermined voltage is applied to the liquid crystal optical element 36b. In this transmission state, the polarized light incident on the absorption-type polarizing plate 34b and transmitted through the absorption-type polarizing plate 34b becomes parallel to the transmission axis of the reflection-type polarizing plate 38b by transmitting the liquid crystal optical element 36b as it is, and is reflected. It passes through the type polarizing plate 38b and is emitted from the reflective polarizing plate 38b. As a result, in the transmitted state, the light incident on the front surface of the dimming panel 10b passes through the dimming panel 10b and is emitted from the back surface of the dimming panel 10b. At this time, the transmittance of the dimming panel 10b is, for example, about 75%.

Further, as shown in FIG. 4, the dimming panel 10b is switched to the reflection state when a predetermined voltage is not applied to the liquid crystal optical element 36b. In this reflection state, the polarized light incident on the absorption-type polarizing plate 34b and transmitted through the absorption-type polarizing plate 34b is twisted by 90 ° by the liquid crystal optical element 36b, so that the reflection axis (with the transmission axis) of the reflection-type polarizing plate 38b is twisted. It becomes parallel to the vertical axis) and is reflected by the reflective polarizing plate 38b. The polarized light reflected by the reflective polarizing plate 38b becomes parallel to the transmission axis of the absorption type polarizing plate 34b by being twisted again by 90 ° by the liquid crystal optical element 36b, and is transmitted through the absorption type polarizing plate 34b to be absorbed type polarization. It is emitted from the plate 34b. As a result, in the reflected state, the light incident on the front surface of the dimming panel 10b is reflected inside the dimming panel 10b and emitted from the front surface of the dimming panel 10b.

The translucent panel 12 is made of a translucent material, for example, transparent glass. The translucent panel 12 is formed in the shape of a vertically long rectangular plate when viewed from the front of the XZ, and the outer peripheral portion of the translucent panel 12 is supported by the frame body 18 of the stand 4. The translucent panel 12 is arranged on the opposite side of the display panel 8 with respect to the

dimming panels

10a and 10b so as to face the

dimming panels

10a and 10b.

As shown in FIG. 3, the half mirror 14 is arranged so as to cover the back surface of the translucent panel 12. That is, the half mirror 14 is arranged to face the surface of the translucent panel 12 on the

dimming panel

10a, 10b side. As shown in FIGS. 2, 3 and 5, the half mirror 14 has

openings

40a and 40b arranged vertically adjacent to each other. Each of the

openings

40a and 40b is formed in a rectangular shape when viewed from the front of the XZ. The

openings

40a and 40b are arranged so as to face the

dimming panels

10a and 10b, respectively. For convenience of explanation, the half mirror 14 is displayed in gray in FIGS. 2 and 5.

As shown in FIG. 5, when viewed from a direction perpendicular to the translucent panel 12 (that is, when viewed from the front of the XZ), each peripheral edge of the

openings

40a and 40b is an active region 30a of the dimming panel 10a (FIG. 5). (The region surrounded by the alternate long and short dash line) and the active region 30b of the dimming panel 10b (the region surrounded by the alternate long and short dash line in FIG. 5). Further, as shown in FIG. 3, the boundary portion 46 of the

openings

40a and 40b is arranged so as to face the boundary portion 48 of the

dimming panels

10a and 10b.

As shown in FIG. 3, the half mirror 14 is configured by stacking a half mirror layer 42 and a printing layer 44 (an example of a color correction layer). The half mirror layer 42 is arranged on the translucent panel 12 side, and the print layer 44 is arranged on the

dimming panels

10a and 10b. That is, the print layer 44 is laminated on the surface of the half mirror layer 42 on the

dimming panel

10a, 10b side. The half mirror layer 42 is a layer that transmits a part of the incident light and reflects the other part of the incident light. The print layer 44 is a layer having a reflectance and a color substantially equal to the reflectance and a color (hereinafter, also referred to as “reflection color”) of the

dimming panels

10a and 10b, and is, for example, a sheet printed in a predetermined color or the like. be. That is, the reflectance and color of the print layer 44 are substantially equal to the reflectance and color of the

dimming panels

10a and 10b when the dimming

panels

10a and 10b held in the reflective state through the

openings

40a and 40b are viewed, respectively. ..

In the present specification, "substantially equal" means not only when the reflectance and color temperature of the print layer 44 are completely equal to the reflectance and color temperature of the

dimming panels

10a and 10b, respectively, but also when the reflectance and color temperature of the print layer 44 are completely equal. It is also included that there is an error of, for example, about several percent between the reflectance and the color temperature and the reflectance and the color temperature of the

dimming panels

10a and 10b, respectively.

Further, in the present specification, "substantially equal" between the reflected color of the print layer 44 and the reflected color of the

dimming panels

10a and 10b means that the reflected color of the print layer 44 and the reflected color of the

dimming panels

10a and 10b are "substantially equal". It is assumed that the color difference (ΔE ^* ab) is preferably 3.0 or less, more preferably 1.0 or less. Here, in the L ^* a ^* b ^* color system, L ^* represents brightness, L ^* = 0 represents black, and L ^* = 100 represents white. a ^* and b ^* indicate the color direction, + a ^* indicates the red direction, -a ^* indicates the green direction, + b ^* indicates the yellow direction, and -b ^* indicates the blue direction. In addition, the color becomes brighter as the absolute value of each numerical value increases, and the color becomes dull as the absolute value of each numerical value decreases.

The color difference (ΔE ^* ab) is expressed by the following equation 1. In Equation 1, ΔL ^* is the difference between the two colors L ^* in the L ^* a ^* b ^* color space, and Δa ^* is the difference between the two colors a ^* in the L ^* a ^* b ^* color space. And Δb ^* is the difference between b ^* of two colors in the L ^* a ^* b ^* color space.

The way the human eye perceives due to the color difference (ΔE ^* ab) is as follows.

0 to 0.1: Color difference cannot be visually identified 0.2 to 0.4: Limit that a person accustomed to color inspection can identify color difference 0.4 to 0.8: Strict color difference, in the butt part Range of use 0.8 to 1.5: Range often used for product color management 1.5 to 3.0: Range to be tolerated for distant parts and high-saturation colors 3.0 to: For different colors Range that often becomes a complaint 12.0 ~: Different color system

Here, an example of the processing method of the half mirror 14 will be described with reference to FIG. First, as shown in FIG. 6A, the translucent panel 12 is prepared. Next, as shown in FIG. 6B, a half mirror layer 42 is formed in the entire area on the back surface of the translucent panel 12 by, for example, thin-film deposition. Next, as shown in FIG. 6 (c), the print layer 44 is formed in the entire area on the back surface of the half mirror layer 42 by, for example, silk printing. Next, as shown in FIG. 6D, the

openings

40a and 40b are formed by removing a part of the half mirror layer 42 and the printing layer 44 by laser processing. As described above, the half mirror 14 is formed on the back surface of the translucent panel 12.

[1-2. Display device function configuration]
Next, the functional configuration of the display device 2 according to the first embodiment will be described with reference to FIGS. 7 to 9. FIG. 7 is a block diagram showing a functional configuration of the display device 2 according to the first embodiment. FIG. 8 is a front view showing the display device 2 according to the first embodiment in the image display mode. FIG. 9 is a front view showing the display device 2 according to the first embodiment in the mirror mode.

As shown in FIG. 7, the display device 2 includes a display panel 8, dimming

panels

10a and 10b, and a control unit 50 as functional configurations.

The control unit 50 is composed of the control circuit 22 (see FIG. 2) in the control box 6 described above. The control unit 50 controls the display panel 8 and the

dimming panels

10a and 10b so as to switch from one of the image display mode and the mirror mode to the other.

Specifically, in the image display mode shown in FIG. 8, the control unit 50 displays an image on the display surface 24 of the display panel 8 and keeps the dimming

panels

10a and 10b in a transparent state. The light representing the image from the display surface 24 of the display panel 8 is incident on the user's eyes through the dimming

panels

10a and 10b held in a transmissive state, the

openings

40a and 40b of the half mirror 14, and the translucent panel 12. ..

As a result, as shown in FIG. 8, in the image display mode, the user displays on the display surface 24 of the display panel 8 through the translucent panel 12, the

openings

40a and 40b of the half mirror 14, and the

dimming panels

10a and 10b. You can see the image that was split. At this time, in the translucent panel 12, the region where the image is not displayed, that is, the region other than the

openings

40a and 40b of the half mirror 14, functions as a mirror for projecting the scenery in front of the translucent panel 12. For example, the user can use the display device 2 as a display panel for displaying an image, and can also use the display device 2 as a full-length mirror for displaying his / her whole body. For convenience of explanation, the mirror area is shown in gray in FIG.

Further, in the mirror mode shown in FIG. 9, the control unit 50 hides the image on the display panel 8 and keeps the dimming

panels

10a and 10b in the reflection state. The dimming

panels

10a and 10b held in the reflective state are visually recognized as mirrors from the outside through the

openings

40a and 40b of the half mirror 14.

As a result, as shown in FIG. 9, in the mirror mode, the entire region of the translucent panel 12, that is, the regions other than the

openings

40a and 40b of the half mirror 14, and the

dimming panels

10a and 10b are translucent panels. It functions as a mirror that reflects the scenery in front of the twelve. For example, the user can use the display device 2 as a full-length mirror to project his / her whole body. For convenience of explanation, the mirror area is shown in gray in FIG.

In the present specification, "switching from one of the image display mode and the mirror mode to the other" means the timing of switching from one of the image display and the image non-display of the display panel 8 to the other, and the

dimming panels

10a and 10b. The timing of switching from one of the transmission state and the reflection state to the other does not necessarily have to be simultaneous, and there may be a time lag between both timings. In this case, the time lag between the two timings can be adjusted within a desired range.

[1-3. effect]
As described above, in the present embodiment, the display device 2 is arranged so as to face the display panel 8 having the display surface 24 for displaying the image and the display surface 24 of the display panel 8 and transmit the incident light. A dimming panel 10a (10b) capable of switching from one of the transmission states and the reflection state of reflecting incident light to the other, and the dimming panel 10a (10a) so as to face the dimming panel 10a (10b). A half mirror arranged on the opposite side of the display panel 8 with respect to 10b) and having translucency and facing the surface of the translucent panel 12 on the dimming panel 10a (10b) side. 14 is a half mirror 14 having an opening 40a (40b) arranged to face the dimming panel 10a (10b), and an image is displayed on the display panel 8 and transmitted through the dimming panel 10a (10b). The display panel 8 and dimming are switched from one of the image display mode for holding the state and the mirror mode for hiding the image in the display panel 8 and holding the dimming panel 10a (10b) in the reflective state. A control unit 50 for controlling the panels 10a (10b) is provided. The reflectance and color of the half mirror 14 are abbreviated as the reflectance and color of the dimming panel 10a (10b) when the dimming panel 10a (10b) held in the reflective state is viewed through the opening 40a (40b), respectively. equal.

According to this, in the image display mode, as shown in FIG. 8, the user displays the display panel 8 through the translucent panel 12, the opening 40a (40b) of the half mirror 14, and the dimming panel 10a (10b). You will see the image displayed on the surface 24. As a result, since the openings 40a (40b) of the half mirror 14 are arranged to face each other in front of the display surface 24 of the display panel 8, reflection of external light due to reflection by the half mirror 14 is suppressed. It is possible to improve the visibility of the image. On the other hand, in the mirror mode, as shown in FIG. 9, the dimming panel 10a (10b) held in the reflection state is visually recognized as a mirror from the outside through the opening 40a (40b) of the half mirror 14. At this time, the reflectance and color of the print layer 44 are the reflectance and the color of the dimming panel 10a (10b) when the dimming panel 10a (10b) held in the reflective state is viewed through the opening 40a (40b), respectively. Approximately equal to color. As a result, the area other than the opening 40a (40b) of the half mirror 14 and the dimming panel 10a (10b) can be seen to have the same texture, and the appearance quality of the display device 2 in the mirror mode can be improved. ..

Further, in the present embodiment, the dimming panel 10a (10b) has an active region 30a (30b) capable of switching from one of the transmission state and the reflection state to the other. When viewed from a direction perpendicular to the translucent panel 12, the peripheral edge of the opening 40a (40b) of the half mirror 14 overlaps with the active region 30a (30b) of the dimming panel 10a (10b).

According to this, for example, the wiring cable 26 of the display panel 8, the wiring cable 28a (28b) of the dimming panel 10a (10a), and the like can be concealed in a region other than the opening 40a (40b) of the half mirror 14. .. As a result, the appearance quality of the display device 2 in the mirror mode can be further improved.

Further, in the present embodiment, the half mirror 14 has a half mirror layer 42 that transmits a part of the incident light and reflects another part of the incident light, and a dimming panel of the half mirror layer 42. It has a printing layer 44 laminated on the surface on the 10a (10b) side. The reflectance and color of the print layer 44 are abbreviated as the reflectance and color of the dimming panel 10a (10b) when the dimming panel 10a (10b) held in the reflective state is viewed through the opening 40a (40b), respectively. equal.

According to this, in the mirror mode, the texture of the region other than the opening 40a (40b) of the half mirror 14 and the dimming panel 10a (10b) can be seen to be the same, and the appearance of the display device 2 in the mirror mode can be seen. The quality can be improved.

Further, in the present embodiment, a pair of dimming

panels

10a and 10b are provided, and the pair of dimming

panels

10a and 10b are arranged adjacent to each other so as to face the display surface 24 of the display panel 8. .. A pair of

openings

40a and 40b of the half mirror 14 are provided, and the pair of

openings

40a and 40b are arranged so as to face the pair of dimming

panels

10a and 10b, respectively. The boundary portion 46 of the pair of

openings

40a and 40b is arranged so as to face the boundary portion 48 of the pair of dimming

panels

10a and 10b.

According to this, the boundary portion 48 of the pair of dimming

panels

10a and 10b can be concealed by the boundary portion 46 of the pair of

openings

40a and 40b. As a result, the appearance quality of the display device 2 in the mirror mode can be further improved. Further, since the pair of dimming

panels

10a and 10b are provided, the display device 8 is provided by the pair of dimming

panels

10a and 10b even when the upper limit of each size of the

dimming panels

10a and 10b is limited. It is possible to cover the entire area of the display surface 24 of.

[1-4. Modification example]
Next, the configuration of the half mirror 14A according to the modified example of the first embodiment will be described with reference to FIG. 10. FIG. 10 is a perspective view showing a translucent panel 12 and a half mirror 14A of the display device according to the modified example of the first embodiment.

As shown in FIG. 10, in this modification, the reflectance of each peripheral edge of the openings 40Aa and 40Ab of the half mirror 14A increases in a gradation from the inside to the outside of the openings 40Aa and 40Ab, and , The color is formed so as to be darkened in a gradation pattern.

Thereby, in the mirror mode, the boundary between the regions other than the openings 40Aa and 40Ab of the half mirror 14 and the

dimming panels

10a and 10b (see FIG. 2) when viewed from the direction perpendicular to the translucent panel 12 is blurred. The appearance quality of the display device in the mirror mode can be further improved.

(Embodiment 2)
[2-1. Display device structure]
The structure of the display device 2B according to the second embodiment will be described with reference to FIG. FIG. 11 is a cross-sectional view of a main part of the display device 2B according to the second embodiment. In each of the following embodiments, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the display device 2B according to the second embodiment, the configuration of the half mirror 14B is different from that of the first embodiment. Specifically, the half mirror 14B includes an absorption-type polarizing plate 52 (an example of a second absorption-type polarizing plate), a reflection-type polarizing plate 54 (an example of a second reflection-type polarizing plate), and a light-shielding layer 56. Are configured by stacking in this order. The absorption-type polarizing plate 52 is arranged on the translucent panel 12 side, and the light-shielding layer 56 is arranged on the

dimming panels

10a and 10b. The translucent panel 12, the absorbent polarizing plate 52, the reflective polarizing plate 54, and the light-shielding layer 56 are bonded to each other by opticarbonding using an optical adhesive such as OCA.

The absorption type polarizing plate 52 and the reflection type polarizing plate 54 of the half mirror 14B have the same configuration as the absorption type polarizing plate 34a (34b) and the reflection type polarizing plate 38a (38b) of the dimming panel 10a (10b), respectively.

[2-2. effect]
As described above, in the present embodiment, the dimming panel 10a (10b) has an absorption type polarizing plate 34a (34b) arranged on the half mirror 14B side and a reflection type polarizing plate arranged on the display panel 8 side. It has a liquid crystal optical element 36a (36b) laminated between the absorption type polarizing plate 34a (34b) and the reflection type polarizing plate 38a (38b). The half mirror 14B is between the absorption-type polarizing plate 52 arranged on the translucent panel 12 side, the light-shielding layer 56 arranged on the dimming panel 10a (10b) side, and the absorption-type polarizing plate 52 and the light-shielding layer 56. It has a reflective polarizing plate 54 laminated on the above.

According to this, since the half mirror 14B is composed of the same polarizing plate as the polarizing plate of the dimming panel 10a (10b), the reflectance and the color of the half mirror 14B are respectively passed through the opening 40a (40b). It is substantially equal to the reflectance and color of the dimming panel 10a (10b) when the dimming panel 10a (10b) held in the reflective state is viewed. As a result, in the mirror mode, the area other than the opening 40a (40b) of the half mirror 14B and the dimming panel 10a (10b) can be seen to have the same texture, and the appearance quality of the display device 2B in the mirror mode can be improved. Can be increased.

(Embodiment 3)
[3-1. Display device structure]
The structure of the display device 2C according to the third embodiment will be described with reference to FIG. FIG. 12 is a cross-sectional view of a main part of the display device 2C according to the third embodiment.

In the display device 2C according to the third embodiment, the configuration of the half mirror 14C is different from that of the second embodiment. Specifically, the half mirror 14C includes an absorption type polarizing plate 52 (an example of a second absorption type polarizing plate), a color correction layer 58, and a reflection type polarizing plate 54 (an example of a second reflection type polarizing plate). And are laminated in this order. The absorbent polarizing plate 52 is arranged on the translucent panel 12 side, and the reflective polarizing plate 54 is arranged on the

dimming panels

10a and 10b.

The color correction layer 58 is formed by coloring an optical adhesive such as OCA. In the color correction layer 58, the color of the half mirror 14C is substantially equal to the color of the dimming panel 10a (10b) when the dimming panel 10a (10b) held in the reflective state through the opening 40a (40b) is viewed. It is a layer for correcting the color of the half mirror 14C so as to be.

The translucent panel 12 and the absorbent polarizing plate 52 are bonded to each other by optimizing with an optical adhesive such as OCA. Further, the absorption type polarizing plate 52 and the reflection type polarizing plate 54 are bonded to each other by opticarbonding using a color correction layer 58 which is an optical adhesive.

The absorption type polarizing plate 52 and the reflection type polarizing plate 54 of the half mirror 14C have the same configuration as the absorption type polarizing plate 34a (34b) and the reflection type polarizing plate 38a (38b) of the dimming panel 10a (10b), respectively.

[3-2. effect]
As described above, in the present embodiment, the dimming panel 10a (10b) has an absorption type polarizing plate 34a (34b) arranged on the half mirror 14C side and a reflection type polarizing plate arranged on the display panel 8 side. It has a liquid crystal optical element 36a (36b) laminated between the absorption type polarizing plate 34a (34b) and the reflection type polarizing plate 38a (38b). The half mirror 14C includes an absorption-type polarizing plate 52 arranged on the translucent panel 12 side, a reflection-type polarizing plate 54 arranged on the dimming panel 10a (10b) side, and an absorption-type polarizing plate 52 and a reflection-type polarizing plate. It has a color correction layer 58 laminated between the 54 and the 54.

According to this, since the half mirror 14C is composed of the same polarizing plate as the polarizing plate of the dimming panel 10a (10b), the reflectance and the color of the half mirror 14C are respectively passed through the opening 40a (40b). It is substantially equal to the reflectance and color of the dimming panel 10a (10b) when the dimming panel 10a (10b) held in the reflective state is viewed. As a result, in the mirror mode, the area other than the opening 40a (40b) of the half mirror 14C and the dimming panel 10a (10b) can be seen to have the same texture, and the appearance quality of the display device 2C in the mirror mode can be improved. Can be increased.

In the present embodiment, the color correction layer 58 is laminated between the absorption type polarizing plate 52 and the reflection type polarizing plate 54, but the present invention is not limited to this, and the translucent panel 12 and the absorption type polarizing plate 52 are used. It may be laminated in between. In this case, the absorption type polarizing plate 52 and the reflection type polarizing plate 54 are bonded to each other by opticarbonding using an optical adhesive such as OCA. Further, the translucent panel 12 and the absorbent polarizing plate 52 are bonded to each other by optimizing with the color correction layer 58 which is an optical adhesive.

Further, in the present embodiment, the color correction layer 58 is formed by coloring an optical adhesive such as OCA, but the present invention is not limited to this, and the color correction layer 58 is formed, for example, by a sheet or the like printed in a predetermined color. May be good.

(Other embodiments)
As described above, embodiments have been described as an example of the techniques disclosed in this application. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate. It is also possible to combine the components described in the above embodiment to form a new embodiment.

Therefore, other embodiments will be exemplified below.

In each of the above embodiments, two dimming

panels

10a and 10b are used, but the present invention is not limited to this, and only one dimming panel may be used. In this case, the half mirror 14 (14A, 14B, 14C) will have only one opening. Alternatively, three or more dimming panels may be used.

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 explanations have been 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.

The present disclosure is applicable to, for example, a display device capable of switching between an image display mode and a mirror mode.

2,2B, 2C Display device 4 Stand 6 Control box 8

Display panel

10a, 10b Dimming panel 12

Translucent panel

14, 14A, 14B, 14C Half mirror 16 Base 18 Frame 20 Rear cover 22 Control circuit 24

Display surface

26 , 28a,

28b Wiring cable

30a, 30b

Active region

32a, 32b

Peripheral region

34a, 34b, 52 Absorption

type polarizing plate

36a, 36b Liquid crystal

optical element

38a, 38b, 54 Reflective

type polarizing plate

40a, 40b, 40Aa, 40Ab Opening 42 Half Mirror Layer 44

Printing Layer

46, 48 Boundary 50 Control 56 Shading Layer 58 Color Correction Layer

Claims

A display panel with a display surface for displaying images, and
A dimming panel that is arranged facing the display surface of the display panel and can switch from one of the transmitted states that transmit the incident light and the reflected state that reflects the incident light to the other.
A translucent panel arranged on the opposite side of the display panel with respect to the dimming panel so as to face the dimming panel and having translucency.
A half mirror arranged to face the surface of the translucent panel on the dimming panel side, and a half mirror having an opening arranged to face the dimming panel.
An image display mode in which an image is displayed on the display panel and the dimming panel is held in the transmission state, and a mirror mode in which the image is hidden in the display panel and the dimming panel is held in the reflection state. A control unit for controlling the display panel and the dimming panel so as to switch from one to the other is provided.
A display device in which the reflectance and color of the half mirror are substantially equal to the reflectance and color of the dimming panel when the dimming panel held in the reflective state is viewed through the opening.
The dimming panel has an active region capable of switching from one of the transmissive state and the reflective state to the other.
The display device according to claim 1, wherein the peripheral edge of the opening of the half mirror is overlapped with the active region of the dimming panel when viewed from a direction perpendicular to the translucent panel.
The half mirror
A half mirror layer that transmits a part of the incident light and reflects the other part of the incident light.
It has a color correction layer laminated on the surface of the half mirror layer on the dimming panel side.
The reflectance and color of the color correction layer are substantially equal to the reflectance and color of the dimming panel when the dimming panel held in the reflective state is viewed through the opening, respectively. The display device described.
The display according to claim 3, wherein the peripheral edge portion of the opening is formed so that the reflectance increases in a gradation pattern and the color becomes darker in a gradation pattern from the inside to the outside of the opening. Device.
The dimming panel is
The first absorption-type polarizing plate arranged on the half mirror side and
The first reflective polarizing plate arranged on the display panel side and
It has a liquid crystal optical element laminated between the first absorption type polarizing plate and the first reflection type polarizing plate.
The half mirror
The second absorbent polarizing plate arranged on the translucent panel side and
The light-shielding layer arranged on the dimming panel side and
The display device according to claim 1 or 2, further comprising a second reflective polarizing plate laminated between the second absorption type polarizing plate and the light shielding layer.
The dimming panel is
The first absorption-type polarizing plate arranged on the half mirror side and
The first reflective polarizing plate arranged on the display panel side and
It has a liquid crystal optical element laminated between the first absorption type polarizing plate and the first reflection type polarizing plate.
The half mirror
The second absorbent polarizing plate arranged on the translucent panel side and
The second reflective polarizing plate arranged on the dimming panel side and
It has a color correction layer laminated between the translucent panel and the second absorption-type polarizing plate, or between the second absorption-type polarizing plate and the second reflection-type polarizing plate. The display device according to claim 1 or 2.
A pair of dimming panels are provided.
The pair of dimming panels are arranged adjacent to each other so as to face the display surface of the display panel.
A pair of openings of the half mirror are provided.
Each of the pair of openings is arranged to face the pair of dimming panels.
The display device according to any one of claims 1 to 6, wherein the boundary portion of the pair of openings is arranged so as to face the boundary portion of the pair of dimming panels.