JP7006266B2 - Display device and louver film - Google Patents

Description

The present disclosure relates to a technique for controlling the direction of light in an image displayed by a display unit.

There is known a technique for suppressing the image from being reflected on the windshield of a vehicle by controlling the direction of the light of the image displayed by the display unit of the in-vehicle display device.
For example, in the technique described in Patent Document 1, a louver film is formed by laminating a first louver layer and a second louver layer and mounting them on a display surface of a display. The direction in which the louver of the first louver layer extends and the direction in which the louver of the second louver layer extends intersect.

With this configuration, in the technique described in Patent Document 1, the light incident at a large inclination with respect to the normal line perpendicular to the back surface of the film surface of the louver film on the display side is the louver of the first louver layer. Since it hits the louver of the second louver layer, it cannot pass through the louver film.

On the other hand, the light incident parallel to the normal on the back surface of the louver film can pass through the louver film without hitting both the louver of the first louver layer and the louver of the second louver layer. As described above, the technique described in Patent Document 1 attempts to control the direction of light emitted from the display.

Japanese Unexamined Patent Publication No. 2004-109615

In the technique described in Patent Document 1, in a planar louver film, the louver film is formed so that the directions of the optical axes of the optical paths formed by the louvers are the same.

When such a louver film is attached to a curved display surface, the louver film bends, so that the directions of the optical axes of the optical paths formed by the louvers are different. Therefore, there is a problem that the direction of light passing through the optical path cannot be controlled.

It is desirable that the present disclosure provide a technique for controlling the direction of light in an image displayed by the display unit while the louver film is attached to the curved display surface of the display unit.

The vehicle-mounted display device of one aspect of the present disclosure includes a display unit (20) and a louver film (30, 60 to 66, 70, 80, 90, 100, 130).
The display unit displays an image on a curved display surface (22). The louver film is mounted on the display surface of the display unit, and with the display device mounted on the vehicle (2), the louver films extend laterally along the display surface and are installed in multiple vertical directions (42, 94, According to 104), an optical path (200) through which the light of the image displayed by the display unit is passed is formed, and the direction of the optical path (202) is the same in the vertical cross section of the optical path.

The louver film (30, 60 to 66, 70, 80, 90, 100, 130) of one aspect of the present disclosure is attached to the display surface (22) of the display unit (20) for displaying an image. The display surface has a curved surface shape, and the louver film extends laterally along the display surface in a vertical direction with the display device (10) having the louver film mounted on the display surface mounted on the vehicle (2). It is equipped with multiple louvers (42, 94, 104) installed in. The louver forms an optical path (200) through which the light of the image displayed by the display unit passes, and when the louver film is attached to the display surface, the direction of the optical path (202) is the same in the vertical cross section of the optical path. become.

With such a configuration, with the louver film mounted on the curved display surface of the display unit, it is possible to control the light of the image displayed by the display unit to travel in the same direction in the vertical cross section of the louver film. As a result, when the display device is mounted on the vehicle, it is possible to suppress the light of the image displayed by the display unit from advancing in the direction in which the display device is not desired to advance.

In addition, the reference numerals in parentheses described in this column and the scope of claims indicate the correspondence with the specific means described in the embodiment described later as one embodiment, and the technical scope of the present disclosure is defined. It is not limited.

The cross-sectional view which shows the display device of 1st Embodiment. II direction arrow view of FIG. The schematic diagram which shows the state which the display device is mounted on a vehicle. Sectional view showing the louver film before and after mounting on the display. A characteristic diagram showing the relationship between the emission angle of light from a display device and the transmittance. The perspective view which shows the modification of the louver film of 1st Embodiment. The perspective view which shows the other modification of the louver film of 1st Embodiment. The perspective view which shows the other modification of the louver film of 1st Embodiment. The cross-sectional view which shows the louver film of the 2nd Embodiment. The cross-sectional view which shows the modification of the louver film of 2nd Embodiment. The perspective view which shows the louver of the 3rd Embodiment. FIG. 11 is an arrow view in the XII direction of FIG. The perspective view which shows the modification of the louver of the 3rd Embodiment. The cross-sectional view which shows the louver film of 4th Embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
As shown in FIG. 3, the display device 10 shown in FIG. 1 is attached to the dashboard 4 of the vehicle 2 and displays various information such as navigation information and traveling information of the vehicle.

As shown in FIG. 1, the display device 10 includes a display 20 and a louver film 30. The display device 10 shown in FIG. 1 is a cross-sectional view taken along the vertical direction with the display device 10 mounted on the vehicle 2. The display 20 is, for example, a flexible liquid crystal display, and the display surface 22 of the display 20 has a convex curved surface shape toward the inside of the vehicle.

The louver film 30 includes a louver layer 40 and protective layers 50 and 52 that cover the display 20 side of the louver layer 40 and the inside of the vehicle, respectively.
In the louver layer 40, in a state where the display device 10 is mounted on the vehicle 2 as shown in FIG. 3, as shown in FIG. 2, a flat plate-shaped louver 42 extending laterally along the display surface 22 of the display 20 is vertically formed. It is composed of multiple installations in the direction.

The louver 42 forms an optical path 200 through which the light of the image displayed by the display 20 passes. The louver 42 is made of a material that does not transmit light but blocks it by reflecting or absorbing it. The optical path 200 has a shape extending in the lateral direction. The optical path 200 may be a space or may be filled with a light-transmitting resin.

The protective layers 50 and 52 are made of a transparent light-transmitting resin. The protective layers 50 and 52 and the louver layer 40 are adhered to each other with a light-transmitting adhesive. The protective layer 50 on the display 20 side is adhered to the display surface 22 with an adhesive.

As shown in the upper part of FIG. 4, the louver film 30 has a flat plate shape before being attached to the display 20. Then, as shown in the lower part of FIG. 4, the louver film 30 is bent in the vertical direction according to the shape of the display surface 22 and mounted on the convex curved display surface 22, so that the louver film 30 has a convex curved surface toward the inside of the vehicle. It becomes a shape. Since the louver film 30 is not bent in the lateral direction, it extends linearly in the lateral direction while being attached to the display 20.

In the state of the louver film 30 before being mounted on the display 20 shown in the upper part of FIG. 4, assuming that the reference line 210 passing through the center of the louver layer 40 and perpendicular to the louver layer 40 is set to 0 ° as the reference angle, the center louver 42 Is inclined with respect to the reference line 210 at an inclination angle of θ °. The reference lines 210 shown in the upper part of FIG. 4 and the lower part of FIG. 4 are parallel to each other.

Before being mounted on the display 20, the uppermost louver 42 of the louver film 30 is tilted with respect to the reference line 210 in a direction approaching the center louver 42 at an inclination angle (θ + α) °. ..

Before being mounted on the display 20, the lowermost louver 42 of the louver film 30 is tilted toward the central louver 42 at an inclination angle (β−θ) ° with respect to the reference line 210. is doing.

Before being attached to the display 20, the louver 42 between the center and the uppermost side of the louver film 30 and the louver 42 between the center and the lowermost side of the louver film 30 are attached to the display 20. The tilt angle with respect to the reference line 210 is set so that each louver 42 of the louver film 30 is tilted with respect to the reference line 210 at the same tilt angle θ °.

Then, when the louver film 30 is attached to the display surface 22, the upper louver 42 of the louver film 30 is bent by α ° in a direction away from the central louver 42, and the lower louver 42 of the louver film 30 is the central louver. It is bent by β ° in the direction away from 42.

As a result, in the state shown in the lower part of FIG. 4 mounted on the display 20, each louver 42 of the louver film 30 is tilted downward in the vertical direction with respect to the reference line 210 at the same tilt angle θ °. Since the optical axis 202 of each optical path 200 formed by the louver layer 40 is parallel to the louver 42, the optical axis 202 is also inclined downward in the vertical direction with respect to the reference line 210 at the same inclination angle θ °.

That is, the light passing through the optical path 200 of the louver layer 40 travels in the same direction. Therefore, as shown in FIG. 5, the transmittance of the light emitted downward at θ ° in the vertical direction is maximized with respect to the reference angle of 0 ° indicated by the reference line 210.

The direction of the optical axis 202 is at least parallel to or away from the windshield 6 of the vehicle 2.
As shown in FIG. 6, the louver film 30 has a convex curved surface shape toward the inside of the vehicle by bending in the vertical direction from the flat plate shape. On the other hand, by bending the flat plate-shaped louver film 60 in the vertical direction according to the shape of the display surface 22, the louver film 60 may have a concave curved surface toward the inside of the vehicle.

In addition, the flat plate-shaped louver film 62 may be bent laterally to form a convex curved surface toward the inside of the vehicle, or the flat plate-shaped louver film 64 may be bent laterally to form a convex curved surface. The louver film 64 may have a concave curved surface toward the inside of the vehicle. Further, by bending the flat plate-shaped louver film 66 in different directions in the lateral direction, the louver film 66 may have a shape in which a convex curved surface and a concave curved surface are continuous in the lateral direction.

Further, as shown in FIG. 7, the louver film 70 may have a convex spherical shape toward the inside of the vehicle according to the shape of the display surface of the display, and as shown in FIG. 8, the louver film 80 may be inside the vehicle. It may be in the shape of a concave spherical surface.

The grid lines of the louver films 70 and 80 shown in FIGS. 7 and 8 are described in order to make the shape of the convex spherical surface or the concave spherical surface easy to understand, and are actually the constituents of the louver films 70 and 80. It is not a line that represents.

A plurality of louvers of the louver films 60 to 66, 70, 80 are installed in the vertical direction with the louver films 60 to 66, 70, 80 mounted on the display, and are laterally along the display surface of the display. It extends in a plate shape in the direction. The louvers of the louver films 60 to 66, 70, and 80 before being mounted on the display are formed so that the optical axis 202 of the optical path 200 is oriented in the same direction while mounted on the display.

[1-3. effect]
According to the first embodiment described above, the following effects can be obtained.
(1a) With the louver film 30, 60 to 66, 70, 80 mounted on the curved display surface of the display, the louver is used as a reference in the vertical cross section of the louver film 30, 60 to 66, 70, 80. It is inclined in the same direction with respect to the line 210.

As a result, the optical axis 202 of the optical path 200 formed by the louver is in the same direction, so that the light of the image displayed by the display 20 can be controlled to travel in the same direction. As a result, when the display device is mounted on the vehicle 2, it is possible to suppress the light of the image displayed by the display from advancing in the direction in which the windshield 6 or the like is not desired to advance.
As a result, it is possible to suppress the light of the image displayed on the display from being reflected on the windshield 6 on the driver's line of sight.

In the first embodiment described above, the display 20 corresponds to the display unit.
[2. Second Embodiment]
[2-1. Differences from the first embodiment]
Since the basic configuration of the second embodiment is the same as that of the first embodiment, the differences will be described below. It should be noted that the same reference numerals as those in the first embodiment indicate the same configuration, and the preceding description will be referred to.

In the first embodiment, the louver layer is formed by a flat plate-shaped louver, but the shape of the louver is not limited to the flat plate shape.
For example, as shown in FIG. 9, the louver 94 constituting the louver layer 92 of the louver film 90 has an S-shaped cross section. Further, as shown in FIG. 10, the louver 104 constituting the louver layer 102 of the louver film 100 has a C-shaped cross section. The display on which the louver films 90 and 100 are mounted is the same as the display 20 on which the louver films 30 of the first embodiment are mounted.

A plurality of louvers 94 and 104 are installed in the vertical direction with the louver films 90 and 100 mounted on the display 20, and extend laterally along the display surface 22 of the display 20 in a plate shape. The light emitting side of the louvers 94 and 104 is directed downward in the vertical direction from the optical axis 202.

The optical axis 202 of each optical path 200 formed by the louver layers 92 and 102 is inclined downward with respect to the reference line 210 in the vertical direction at the same inclination angle θ °. The louvers of the louver films 90 and 100 before being mounted on the display 20 are formed so that the optical axes 202 of the optical path 200 are oriented in the same direction while mounted on the display 20.

[2-2. effect]
According to the second embodiment described above, the following effects can be obtained in addition to the effects of the first embodiment (1a).

(2a) Both the louver 94 having an S-shaped cross section and the louver 104 having a C-shaped cross section have the light emitting side facing downward in the vertical direction from the optical axis 202, so that the light on the screen displayed by the display 20 is displayed. Can be prevented from heading toward the windshield 6.

[3. Third Embodiment]
[3-1. Differences from the first embodiment]
In the first embodiment, the optical path 200 has a shape extending in the lateral direction. On the other hand, the louver layer 110 shown in FIGS. 11 and 12 forms a rectangular optical path 220 by the flat plate-shaped louver 112 extending in the lateral direction and the flat plate-shaped louver 114 extending in the vertical direction.

The louver 112 and the louver 114 intersect on the same plane. On the other hand, as in the louver layer 120 shown in FIG. 13, a flat plate-shaped louver 124 extending in the vertical direction may be superposed on the flat plate-shaped louver 122 extending in the lateral direction to form a rectangular optical path 220.

The optical axis of each optical path 220 formed by the louver layers 110 and 120 is inclined downward with respect to the reference line 210 in the vertical direction at the same inclination angle θ °.
[3-2. effect]
According to the third embodiment described above, the following effects can be obtained in addition to the effect (1a) of the first embodiment.

(3a) The louvers 114 and 124 extending in the vertical direction suppress the light emitted from the image on the display in the horizontal direction. As a result, it is possible to prevent the image on the display from being reflected on the door glass of the driver's seat and the passenger seat.

In the third embodiment described above, the louvers 112 and 122 correspond to the first louver, and the louvers 114 and 124 correspond to the second louver.
[4. Fourth Embodiment]
[4-1. Differences from the first embodiment]
Since the basic configuration of the fourth embodiment is the same as that of the first embodiment, the differences will be described below. It should be noted that the same reference numerals as those in the first embodiment indicate the same configuration, and the preceding description will be referred to.

In the louver film 130 of the fourth embodiment shown in FIG. 14, the louver 42 is not formed on the lower side of the louver layer 132. The optical axis 202 of each optical path 200 above the louver layer 132 on which the louver 42 is formed is inclined downward with respect to the reference line 210 in the vertical direction at the same inclination angle θ °. Therefore, the light of the image displayed by the display passes through the optical path 200 and travels in the same direction.

On the other hand, the light of the image displayed by the display is not controlled in the direction of travel when passing under the louver layer 132 in which the louver 42 is not formed.
[4-2. effect]
According to the fourth embodiment described above, the following effects can be obtained.

(4a) The distance from the lower part of the louver layer 132 to the windshield 6 is longer than the distance from the upper part of the louver layer 132 to the windshield 6. Therefore, it is possible to prevent the light emitted from below the louver layer 132 on which the louver 42 is not formed from reaching the windshield 6 on the driver's line of sight.

[5. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be variously modified and implemented.

(1) The shape of the louver is not limited to the flat plate shape, the S shape, and the C shape described in the above embodiment, but what if the directions of the optical axes of the optical paths formed by the louvers are the same? It may have a different shape.

(2) In the above embodiment, the louver layer is formed so that the optical axis of the optical path is parallel to the windshield 6 or away from the windshield 6. On the other hand, depending on the positional relationship between the display and the windshield 6, the louver layer may be formed so that the optical axis of the optical path faces the windshield 6. Also in this case, the direction of the optical axis of each optical path is the same.
(3) In the above embodiment, a flexible liquid crystal display is exemplified as a display unit. On the other hand, any display unit may be adopted as long as the display surface has a curved surface.

(4) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or one function possessed by one component may be realized by a plurality of components. .. Further, a plurality of functions possessed by the plurality of components may be realized by one component, or one function realized by the plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

(5) In addition to the display device which is the display device described above, the present disclosure can be realized in various forms such as a display system having the display device as a component, a louver film constituting the display device, and the like.

10: Display device, 20: Display (display unit), 22: Display surface, 30, 60 to 66, 70, 80, 90, 130: Louver film, 40, 92, 102, 110, 120, 1
32: Louver layer, 42, 94, 104: Louver, 112, 122: First louver, 114, 124: Second louver

Claims (3)

An in-vehicle display device (10)
A display unit (20) that displays an image on a curved display surface (22),
With the display device mounted on the display surface and mounted on the vehicle (2), a plurality of louvers (42, 94, 104) extending laterally along the display surface and vertically installed are provided. An optical path (200) through which the light of the image displayed by the display unit is passed is formed, and the direction of the optical path (202) of the optical path is the same in the vertical cross section of the optical path, and the direction is the same along the optical axis. A louver film (30, 60 to 66, 70, 80, 90, 100, 130) in which the direction of light passing through the image is parallel to or away from the front glass of the vehicle .
Display device. The display device according to claim 1 .
The louver blocks light,
Display device. The display device according to claim 1 or 2 .
In the louver film, the louver is a first louver (112, 122), and the first louver intersects with the first louver to form the optical path in a rectangular shape (114, 114, 124), and the first louver and the second louver form an optical path (220).
Display device.

Images