JP2005084172A - Display unit for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display unit for a vehicle which can be constituted as a space-saving unit by refracting an optical path to a prescribed direction without lowering the sharpness of display by using a prism sheet 1. <P>SOLUTION: The display unit for the which displays a virtual image of an image projected by an LCD 2 on a windshield 9 by refracting the optical axis at a prescribed angle by a Fresnel type prism sheet 1 having a plurality of prism arrays 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention belongs to the technical field of a vehicular display that can be configured to save space by using a prism sheet.

A conventional vehicle display uses a full-nel type prism to refract an optical path and projects an image on a windshield without using a mirror. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 5-8661 (page 1-3, FIG. 3)

  However, in the conventional vehicle display, in the Fresnel type prism sheet, as shown in FIG. 5, in addition to the original optical path A, a ghost display is generated by the optical path A1 and the optical path A2, and the sharpness of the display is generated. Has led to a decline.

  The present invention has been made paying attention to the above-mentioned problems, and its object is to save space by refracting an optical path in a predetermined direction using a prism sheet without reducing the sharpness of display. An object of the present invention is to provide a display for a vehicle that can be used as a device.

  In order to achieve the above object, according to the first aspect of the present invention, the image projected from the display unit is refracted at a predetermined angle by a Fresnel type prism sheet having a plurality of prism rows, and a virtual image is formed on the transmissive member. In the display for vehicles, the optical path limiting means for limiting the travel of the optical path in the direction other than the optical path refraction direction of the prism sheet is provided.

  The invention according to claim 2 is characterized in that the light path limiting means prevents light from passing through the vertical surface of the prism row portion of the prism sheet.

  In the invention described in claim 3, the optical path limiting means is provided with a light non-passing plate that does not allow light to pass through the prism sheet so as to have a vertical width along the boundary between adjacent prism rows of the prism sheet. It was a means characterized by being.

  In the invention according to claim 4, the optical path limiting means attaches to the surface opposite to the prism sheet prism surface the louver that is partitioned so as to correspond to the prism rows of the prism sheet with a light non-passing plate that does not allow light to pass through. It was set as the feature characterized by having done.

Effects and effects of the invention

  According to the first aspect of the present invention, the light path limiting means limits the refraction of the light other than the predetermined refraction angle by the prism row. Therefore, the image projected from the display is refracted at a predetermined angle and displayed as a virtual image on the transmissive member. Therefore, since it does not refract other than a predetermined angle when passing through the prism sheet, ghost display does not occur. For this reason, the sharpness of the display by the virtual image on the transmissive member is improved. Since this display can be performed with a flat prism sheet, a space-saving device can be realized.

  According to the second aspect of the invention, the light path limiting means prevents the light from passing through the vertical surface of the prism row portion of the prism sheet. The light is emitted from the inclined part of the row, and the light is not emitted from the vertical plane between the inclined part, so that it is refracted at a predetermined angle and the ghost display is surely prevented to be sharp. An image can be displayed.

  In the invention described in claim 3, the optical path limiting means is provided with a light non-passing plate that does not allow light to pass through the prism sheet so as to have a vertical width along the boundary between adjacent prism rows of the prism sheet. Therefore, if the light from the display that passes through the prism sheet goes straight to the prism row, it passes through, and the light other than the light that goes straight to the prism row is blocked by the light non-passing plate. . Therefore, it is possible to reliably display a sharp image in which the light traveling straightly toward the prism row inside the prism sheet is refracted by the prism row at a predetermined angle and ghost display is not generated.

  In the invention according to claim 4, the optical path limiting means attaches to the surface opposite to the prism sheet prism surface the louver that is partitioned so as to correspond to the prism rows of the prism sheet with a light non-passing plate that does not allow light to pass through. Therefore, the light projected from the display toward the prism sheet passes through the louver. Since the inside of the louver is partitioned by a light non-passing plate so as to correspond to the prism rows of the prism sheet, light other than the light that goes straight to the prism row inside the louver is blocked by the light non-passing plate. Therefore, since the light emitted from the prism sheet is refracted at a predetermined angle, a sharp image that does not generate a ghost display can be reliably displayed.

  Hereinafter, embodiments for realizing the vehicle display device of the present invention will be described with reference to a first example corresponding to the inventions according to claims 1 and 2 and a second example corresponding to the inventions according to claims 1 and 3. A third embodiment corresponding to the inventions according to claims 1 and 4 will be described.

  (First embodiment)

First, the configuration will be described.
1 and 2 are explanatory views showing the vehicle display device of the first embodiment.
1 and 2, 1 is a prism sheet, 11 is a prism row, 111 is an inclined surface of the prism row, 112 is a vertical surface of the prism row, 113 is a light non-passing surface (optical path limiting means), 2 Is an LCD, 3 is an instrument panel, 4 is a dash upper, 5 is a driver's eye, 6 is a display prohibition zone, 71 is an optical path that passes through the prism sheet at a predetermined refraction angle, 72 is an optical path that does not pass through the prism sheet, 8 Is a display image, and 9 is a front window (transparent member).

In the first embodiment, as shown in FIG. 2, a part of the instrument panel 3 on the back side is opened from the driver, and the display image 8 is obliquely upward on the dash upper 4 arranged below the driver. An LCD 2 that projects toward the screen is provided. Further, a prism sheet 1 is provided above the LCD 2.
The prism sheet 1 is a material that allows light to pass through. As shown in FIG. 1, the lower surface has a planar shape, and on the upper surface, a prism row 11 that forms a right-angled triangular cross section with a vertical surface and an inclined surface 111 is formed. A Fresnel-type prism sheet 1 is provided which is provided in a plurality so as to be refracted in the same manner as a round lens as a whole.
Further, in the first embodiment, as shown in FIG. 1, a light non-passing surface 113 is formed by applying a resin that does not transmit light to the vertical surface 112 of the prism row 11 of the prism sheet 1 so as to prevent light from passing therethrough. It is composed.

  Next, the operation will be described.

[Improves sharpness]
In the first embodiment, to display an image on the front window 9, the image is projected from the LCD 2 toward the lower surface of the prism sheet 1. In this case, as shown in FIG. 1, when a part of the LCD 2 is viewed, there is light that goes straight to the prism row 11 of the prism sheet 1 corresponding to that position and light that goes to the other prism row 11. .
If this light is allowed to pass through another prism array 11 as shown in FIG. 5, a plurality of the same images are displayed at positions shifted by that amount, resulting in an image having no sharpness.

  On the other hand, in the first embodiment, the light 72 that passes through the other prism rows 11 and tries to be refracted in the same way is blocked by the light non-passing surface 112 provided on the vertical surface of the prism rows 11. . Therefore, the light that can pass through the prism sheet 1 becomes light 71 that goes straight to the inclined surface 111 of the prism row 11 corresponding to the position projected by the LCD 2 as shown in FIG. By limiting the light path in this way, the image displayed on the front window 9 is displayed with a plurality of images, so that a ghost image in which the image is blurred does not occur, and a sharp image is displayed.

[Space saving]
In the first embodiment, the LCD 2 and the prism sheet 1 are arranged on the dash upper 4 at a position on the back side of the instrument panel 3 to save space so as not to occupy the lower space of the instrument panel 3. .
In the case where the refraction by the prism sheet 1 is not performed, an image projected and displayed on the front window 9 from the LCD 2 as shown in FIG. 6 is partially displayed in the display prohibition zone 6 to be secured for safe driving. Actually, it cannot be saved in this way. In the first embodiment, the light projected from the LCD 2 by the prism sheet 1 is refracted at a predetermined angle, so that the layout of such an arrangement can be taken and the space is saved.
Further, since the prism sheet 1 is refracted by the plurality of prism rows 11, the entire sheet is in the form of a sheet and does not have a thickness for a large bulge, so that space is further saved.

  Next, the effect will be described.

  In the vehicle display of the first embodiment, the effects listed below can be obtained.

  (1) In a vehicular display in which an image projected from the LCD 2 is refracted at a predetermined angle by a Fresnel type prism sheet 1 having a plurality of prism rows 11 and displayed as a virtual image on the front window 9, the prism sheet 1 Since the light non-passing surface 112 is provided so as to limit the travel of the optical path in directions other than the optical path refraction direction, the sharpness of the display can be improved and a space-saving device can be achieved.

  (2) Since the light path limiting means prevents light from passing through the vertical surface of the prism row 11 portion of the prism sheet 1, it is possible to display a sharp image while reliably preventing ghost display.

  (Second embodiment)

The second embodiment is an example in which a light non-passing plate is provided inside the prism sheet 1.
In FIG. 3, 20 is a light non-passing plate.

  That is, as shown in FIG. 3, the light non-passing plate 20 is provided along the vertical plane of the prism row 11 so as to partition the inside of the prism sheet 1 at the boundary of the prism row 11 of the prism sheet 1. The light non-passing plate 20 has a shape extending from the lower surface of the prism sheet 1 toward the inside. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  Next, the operation will be described.

[Improves sharpness]
In the second embodiment, when an image is projected from the LCD 2 as shown in FIG. 3, the light traveling toward the prism row 11 corresponding to the position is incident on the prism sheet 1 with a predetermined refraction from the inclined surface 111 of the prism row 11. pass. Light directed from one position of the LCD 2 to the other prism array 11 instead of the prism array 11 corresponding to that position enters the lower end of the prism sheet 1 and is blocked by the light non-passing plate 20. Therefore, since the light from the LCD 2 does not pass through the other prism rows 11 and is refracted and displayed by the predetermined prism rows 11, there is no ghost display.

  Next, the effect will be described.

  In the vehicle display of the second embodiment, the following effects can be obtained in addition to the effects (1) and (2) of the first embodiment.

  (3) The optical path limiting means is provided inside the prism sheet 1 such that the light non-passing plate 20 that does not allow light to pass therethrough has a vertical width along the boundary between the adjacent prism rows 11 of the prism sheet 1. Therefore, it is possible to reliably display a sharp image that does not generate ghost display.

  (Third embodiment)

The third embodiment is an example using a louver.
In FIG. 4, 30 is a louver and 31 is a light non-passing plate.

  That is, as shown in FIG. 4, the prism sheet 1 is made relatively thin, and the louver 30 is attached between the prism sheet 1 and the LCD 2, that is, on the lower surface of the prism sheet 1. The louver 30 is a member that allows light to pass through, and the inside of the louver 30 is partitioned by a light non-passing plate 31 for each portion corresponding to the prism row 11 of the prism sheet 1 disposed above. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  Next, the operation will be described.

[Improves sharpness]
In the third embodiment, the light projected from a certain position of the LCD 2 is partitioned by the light non-passing plate 31 so as to correspond to the louver 30, so that the prism row 11 corresponding to the position from the certain position of the LCD 2 The light traveling toward the other prism array 11 is blocked by the light non-passing plate inside the louver 30. Therefore, since the light from the LCD 2 does not pass through the other prism rows 11 and is refracted and displayed by the predetermined prism rows 11, there is no ghost display.

  Next, the effect will be described.

  In the vehicle display of the third embodiment, the following effects can be obtained in addition to the effects (1) and (2) of the first embodiment.

  (4) The optical path limiting means is attached to a surface opposite to the prism surface of the prism sheet 1 with a light non-passing plate that does not allow light to be partitioned inside so as to correspond to the prism rows 11 of the prism sheet 1. Therefore, it is possible to reliably display a sharp image that does not generate a ghost display.

  As mentioned above, although the display for vehicles of the present invention has been described based on the first to third embodiments, the specific configuration is not limited to these embodiments, and each of the claims Design changes and additions are permitted without departing from the scope of the claimed invention.

For example, in the first embodiment, the front window 9 is shown as the transmissive member, but a member to be displayed separately may be provided.
Further, in the first to third embodiments, the light is limited corresponding to the prism rows 11, but for example, a light non-passing member may be provided in a lattice shape or a honeycomb shape to restrict the light passing direction. Good.

It is explanatory drawing which shows the display for vehicles of 1st Example. It is explanatory drawing which shows the display for vehicles of 1st Example. It is explanatory drawing which shows the display for vehicles of 2nd Example. It is explanatory drawing which shows the display for vehicles of 3rd Example. It is explanatory drawing which shows the conventional indicator for vehicles. It is explanatory drawing which shows the conventional indicator for vehicles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Prism sheet 11 Prism row | line | column 111 The inclined surface 112 of a prism row | line The light non-passing surface which is a perpendicular | vertical surface of a prism row | line 2 LCD
DESCRIPTION OF SYMBOLS 3 Instrument panel 4 Dash upper 5 Driver's eyes 6 Display prohibition zone 71 Optical path which passes a prism sheet by predetermined refraction angle 72 Optical path which does not pass a prism sheet 8 Display image 9 Front window 20 Light non-passing plate 30 Louver 31 Light non-light Passage plate

Claims (4)

In a vehicle display device that displays an image projected from a display device as a virtual image on a transmissive member by refracting an optical path at a predetermined angle with a Fresnel type prism sheet having a plurality of prism rows,
An indicator for a vehicle comprising an optical path limiting means for limiting the travel of the optical path in a direction other than the optical path refraction direction of the prism sheet. The vehicle display device according to claim 1,
The vehicle display device, wherein the optical path limiting means prevents light from passing through a vertical surface of the prism row portion of the prism sheet. The vehicle display device according to claim 1,
The optical path limiting means is a vehicle characterized in that a light non-passing plate that does not allow light to pass is provided inside the prism sheet so as to have a vertical width along the boundary between adjacent prism rows of the prism sheet. display. The vehicle display device according to claim 1,
The vehicle is characterized in that the optical path limiting means has a louver that is partitioned by a light non-passing plate that does not transmit light so as to correspond to the prism row of the prism sheet on a surface opposite to the prism sheet prism surface. display.

Images