JP3917498B2 - Split display device for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle split display device.
[0002]
[Prior art]
2. Description of the Related Art In recent years, vehicles such as automobiles have come to display various information in addition to meter display such as speed when the vehicle travels. For example, devices for car navigation systems using GPS are rapidly becoming available. It is becoming popular. In addition, there is a vehicle in which a passenger can enjoy television broadcasting with a television receiver. As such a display device, there is one provided with a plurality of optical systems so that a visual recognition state desirable for both a driver and an occupant can be obtained. For example, a display device having a built-in projector that projects an image of a display screen is fixed on the ceiling surface of a passenger compartment at a position above the driver, and a screen on which the projection image is projected from the projector is mounted on the rear seat. So that the passenger in the rear seat can see the display on the screen, and the driver can see the image on the screen from the mirror using the mirror placed on the instrument panel. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-272892
[Problems to be solved by the invention]
By the way, as a display device for displaying various information and images, a display surface area of a display such as a DMD panel or an LCD panel is divided into a plurality of parts, and different types of display are performed for each divided area. There is a divided display device for a vehicle that can be visually recognized by an optical system provided in the vehicle. This has a problem that the optical system leaks and interferes with the image of another divided region in addition to the image to be transmitted to the optical system. Further, if an attempt is made to increase the magnification to increase the display image, the curvature of the optical element such as a lens or a concave mirror becomes considerably large, and the distortion of the display image increases. For example, in the case of a configuration in which the occupant visually recognizes the display screen with a virtual image, the front of the display screen needs to be widely opened if an attempt is made to secure a wide range of viewpoints where the screen can be viewed. It is necessary to use a display device having a relatively narrow display surface, or to use a narrow display surface, and to increase the magnification of the optical system. In particular, when a DMD panel is adopted as a display, there is a problem because a concave mirror for directing illumination light toward the display surface and its casing are arranged in front of the display surface.
[0005]
To cope with this, if the number of optical elements is increased and the enlargement ratio is dispersed, enlargement in the axial direction is unavoidable, and if a large number of optical elements that are off-axis and expand like a concave mirror are used, the vehicle-mounted space Although there is a merit that can be saved, image distortion and aberration due to off-axis increase.
[0006]
Thus, the divided display device for a vehicle still has a problem in practical use.
[0007]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a vehicular divided display device that is highly practical and capable of high-quality display.
[0008]
[Means for Solving the Problems]
In the invention according to claim 1, in the divided display device for a vehicle provided with an optical system that divides the display surface area of the display device into a plurality of divided areas and sends out an image of each of the divided areas.
A partition wall is provided above the display surface so as to be separated into two portions with a boundary line between the divided regions interposed therebetween, and prohibiting the passage of light. A condensing means for forming an image reflected on the display surface on the screen is provided between the display surface and the partition wall together with a screen substantially in contact with the end surface of the partition wall.
[0009]
The partition wall prohibits light from going back and forth, and prevents the display images of the divided areas sandwiching the boundary line from interfering with each other. Thereby, the quality of a display image improves and utility is improved.
[0011]
As a result, even when light can be transmitted and received at a position directly above the display surface due to the presence of a transparent cover that protects the display surface, this light is light that forms an image on the screen by the light collecting means. Further, the display images of the divided areas can be further prevented from interfering with each other.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 shows a vehicle split display device according to a first embodiment to which the present invention is applied. The display unit 11 includes an optical unit 12, and the display unit 11 is attached to the housing 110 with the display panel 2, which is a display unit, facing upward from the opening of the ceiling portion with a rectangular display side surface facing upward. It is. A drive circuit (not shown) for the display panel 2 is stored in the housing 110. An image is displayed on the display surface 2a by driving by the driving circuit. The display panel 2 is a DMD panel, and a DMD substrate 22 for displaying an image with the upper surface in the drawing as the display surface 2a is mounted on the surface of the circuit board 21, and a protective glass plate 23 is laminated thereon. Yes. In order to illuminate the display surface 2a, the lamp and the light from the lamp are gathered toward the display surface 2a and the illumination light to the display surface 2a is uniform at a position deviated slightly from the right above the display panel 2. An illumination optical system composed of a concave mirror or the like is arranged. An LCD panel can also be used as the display panel 2.
[0019]
The image displayed on the display panel 2 is a different kind of image in the areas 201 and 202 in which the display surface 2a is symmetrically drawn in two at the center, and the configuration is simplified by using a common drive circuit. . In the following description, it is assumed that the image of the first area 201 is a display such as a speed for the driver, and the image of the second area 202 is a display of general information common to passengers including the driver.
[0020]
The optical unit 12 includes two display panel glass plates 23 in the same direction as the arrangement direction of the areas 201 and 202 above the surface of the display panel glass plate 23 opposite to the DMD substrate 22 (hereinafter referred to as the display panel surface) 2b. Triangular prisms 31 and 32 are juxtaposed. The triangular prisms 31 and 32 are arranged so that the surfaces that are connected to the vertical apex angle are parallel to the display panel display surface 2a. The first triangular prism 31 is opposed to the first region 201 of the display panel display surface 2a. The second triangular prism 32 faces the second region 202 of the display panel display surface 2a. The first triangular prism 31 and the second triangular prism 32 have their 45 ° inclined surfaces oriented in opposite directions to each other, and the inclination of the light incident from the surface facing the display panel display surface 2a. The emission direction from the surface is directed in the opposite direction.
[0021]
Optical systems 51 and 52 are provided in the emission directions, respectively, so that light from the corresponding triangular prisms 31 and 32 is received and a display image is output in a predetermined direction.
[0022]
FIG. 2 is a perspective view of a portion from the display panel 2 to the triangular prisms 31 and 32, and the upper part of the display panel surface 2b in the figure is separated with a boundary line 200 between the two regions 201 and 202 of the display surface 2a interposed therebetween. A partition wall 4 is provided. The partition wall 4 is provided perpendicular to the display panel display surface 2 a, and the end surface is in contact with the end surfaces of the triangular prisms 31 and 32 at the end opposite to the display panel 2. Further, the upper end of the partition wall 4 is higher than the inclined surfaces of the triangular prisms 31 and 32. Thereby, the space from the first region 201 of the display panel display surface 2a to the first triangular prism 31 and the space from the second region 202 of the display panel display surface 2a to the second triangular prism 32 are provided. Are substantially separated by the partition wall 4.
[0023]
The partition wall 4 is made of a light-shielding member, as in the case of the inner wall surface of a housing of a general optical device, and light is prevented from going back and forth. Therefore, when the display panel 2 is a DMD panel, a light or a concave mirror is arranged at a position facing each of the areas 201 and 202 so that each area 201 and 202 of the display surface 2a is illuminated, or an illumination optical system is installed. Provided for each of the areas 201 and 202. Further, the partition wall 4 is, for example, a black one having a non-glossy surface, and suppresses the reflectance of the surface, so that the image on the display panel display surface 2a is not displayed in multiples on the drivers.
[0024]
Accordingly, the light from the first region 201 of the display panel display surface 2 a is blocked by the partition wall 4 and is prohibited from entering the second triangular prism 32, and is all incident on the first triangular prism 31. To do. On the other hand, the light from the second region 202 of the display panel display surface 2 a is blocked by the partition wall 4 and is prohibited from entering the first triangular prism 31, and all enters the second triangular prism 32. . Therefore, the display image by the first optical system 51 does not include the image of the second area 202 of the display panel display surface 2a, and the image quality is not deteriorated by the leaked light from the second area 202. . On the contrary, the image of the first area 201 of the display panel display surface 2a is not included in the display image by the second optical system 52, and the image quality is not deteriorated by the leaked light from the first area 201. . Thereby, practicality improves.
[0025]
Next, the optical systems 51 and 52 will be described. FIG. 3 shows a first optical system 51, which is a head-up display optical system that reduces the burden of the driver's line-of-sight movement. The optical system 51 includes two imaging optical systems 511 and 512. The first imaging optical system 511 has a convex lens 61, and the image of the first area 201 on the display panel display surface 2a is enlarged by the convex lens 61 at a predetermined magnification and is arranged on the exit side of the convex lens 61. It is projected on the screen 62.
[0026]
The first imaging optical system 511 includes a first concave mirror 63 that reflects light from the screen 62 and a second concave mirror 64 that reflects light from the concave mirror 63, where the axis It is designed to be removed. The image projected on the screen 62 forms a real image at the viewpoint EP1 of the driver through the concave mirrors 63 and 64. The driver visually recognizes the enlarged virtual image in the concave mirror 64.
[0027]
Since the magnification required for the optical yarn 51 is shared by the first imaging optical system 511 and the second imaging optical system 512, each imaging optical system 511, 512 suppresses the magnification, A display image free from image distortion and aberration can be obtained. Further, the second imaging optical system 512 is configured off-axis, and does not increase in size in the axial direction of the first imaging optical system 511. Thereby, practicality improves.
[0028]
Further, even if there is a shadow like the illumination optical system on the outer periphery of the display panel display surface 2a in front of the display panel display surface 2a, the first imaging optical system 511 causes the display panel display surface 2a to Since the real image of the image of the first area 201 is obtained, if the image of the first area 201 is completely reflected, the driver's viewpoint EP1 depending on the presence of a shadow in the vicinity of the display panel display surface 2a. It is possible to prevent the image from becoming difficult to see due to the movement of.
[0029]
FIG. 4 shows a second optical system 52, which is a projector optical system provided with a screen 67 for displaying a display image to an occupant. The second optical system 52 includes two imaging optical systems 521 and 522. The light from the first region 201 of the display panel display surface 2 a emitted from the second triangular prism 32 is enlarged at a predetermined magnification by the convex lens 65 constituting the first imaging optical system 521 so as to form an image. It has become.
[0030]
The second imaging optical system 522 has a concave mirror 66, and the real image obtained by the first imaging optical system 521 is enlarged by the concave mirror 66 and projected onto the screen 67. The occupant visually recognizes the image projected on the screen 67.
[0031]
Since the necessary magnification ratio is shared between the first imaging optical system 521 and the second imaging optical system 522, the optical elements of the imaging optical systems 521 and 522 suppress the magnification ratio, thereby reducing image distortion. Or an aberration-free image can be obtained.
[0032]
Further, the second imaging optical system 522 is configured off-axis, and the display image quality is improved without increasing the size of the first imaging optical system 521 in the axial direction. improves.
[0033]
(Second Embodiment)
FIG. 5 shows a vehicle split display device according to a second embodiment to which the present invention is applied. In the first embodiment, a part of a member that forms a light path from the display panel to the triangular prism is changed, and the drawing shows a main part of the divided display device for a vehicle. The divided display device for a vehicle has the same basic configuration as that of the first embodiment, and the same reference numerals are given to parts that operate substantially the same as those of the first embodiment, and the differences from the first embodiment are mainly described. Explained.
[0034]
As is known from FIGS. 1 and 2 shown in the first embodiment, since the glass plate 23 is inserted between the display panel display surface 2a and the end surface of the partition wall 4, one of the display panel display surfaces 2a. Part of the light from the region 201 (202) actually passes through the glass plate 23 to the other region 202 (201). The glass plate 23 may be very thin, but a thick glass plate 23 may be used depending on the specifications of the display panel. In the case of the DMD panel, since the concave mirrors and the like are arranged close to each other as described above, it may be difficult to make the end face of the partition wall contact the display panel surface depending on the overall shape of the display device. In this embodiment, even in such a case, the image quality can be prevented from being lowered, and the image quality is further improved.
[0035]
In the present embodiment, the partition wall 4A floats from the display panel surface 2b, and a screen 72 is in contact with the lower end of the partition wall 4A in parallel with the display surface 2a of the display panel 2.
[0036]
Between the display panel 2 and the screen 72, a lens 71, which is a condensing means, is provided with its main optical axis in a direction orthogonal to the display panel display surface 2a and the projection surface of the screen 72. An image is projected on the screen 72.
[0037]
Therefore, in the present embodiment, the image projected on the screen 72 is visible to the occupant via the triangular prisms 31 and 32 and the optical systems 51 and 52.
[0038]
According to this embodiment, even if light emitted from each point on the display panel display surface 2a enters the side of the region 202 (201) opposite to the region 201 (202) to which each point belongs, 71, the images are collected at predetermined points on the screen 72 corresponding to the respective points, and an image on the display panel display surface 2a is formed on the screen 72. Therefore, even if there is no partition wall between the display panel display surface 2a and the screen 72, it is possible to further prevent the images of the areas 201 and 202 that sandwich the boundary line 200 from interfering with each other.
[0039]
The specifications of the lens 71 and the arrangement of the display panel 2 and the screen 72 are determined so that the image forming position of the image on the display panel display surface 2a is the position of the screen 72. FIG. 6 shows a case where focusing is not performed at the position of the screen 72, and the original image A in the upper side in the drawing with respect to the boundary line 200 of the display panel display surface 2a forms a real image A in the lower side in the drawing with respect to the partition wall 4A. The original image B below the boundary line 200 in the figure forms a real image B above the partition wall 4A in the figure. However, since the image forming position is shifted from the position of the screen 72, not only the image is blurred, but the light of the real image A spreads above the partition wall 4A in the figure, and the real image is below the partition wall 4A in the figure. B light will bleed. For this reason, the effect | action which prevents the display image of the area | regions 201 and 202 of the display panel display surface 2a which pinches | interposes the boundary line 200 to interfere is impaired. Accordingly, the specifications of the lens 71 and the arrangement of the display panel 21 and the screen 72 are determined so that the image formation position of the image on the display panel display surface 2a is the screen 72 position.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a vehicle split display device according to a first embodiment of the present invention.
FIG. 2 is a perspective view of a main part of the vehicle split display device.
FIG. 3 is a configuration diagram of a first optical system of the vehicle split display device.
FIG. 4 is a configuration diagram of a second optical system of the vehicle split display device.
FIG. 5 is a perspective view of a main part of a vehicle split display device according to a second embodiment of the present invention.
FIG. 6 is a diagram illustrating the operation of the vehicle split display device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Display part 110 Housing 12 Optical part 2 Display panel (display device)
2a Display surface 201, 202 Region 200 Boundary line 31, 32 Prism 4, 4A Partition walls 51, 52 Optical system 511, 521 First imaging optical system 512, 522 Second imaging optical system 61, 65 Convex lens 62, 67 Screen 63, 64, 66 Concave mirror 71 Lens (Condensing means)
72 screens

Claims (1)

In the divided display device for vehicles provided with an optical system that divides the display surface area of the display device into a plurality of divided areas and sends out images of the areas.
A partition wall that divides the display surface above the display surface into two parts with a boundary line between the divided regions therebetween and prohibits the passage of light is provided between the display surface and the partition wall. A divided display device for a vehicle , comprising: a screen substantially in contact with the end face; and a light collecting means for forming an image projected on the display surface on the screen .

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