JP2013111999A - Vehicle display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle display device that projects an image on a plurality of screens so that a display quality can be improved.SOLUTION: A vehicle display device 100 comprises a display device 110 for displaying a prescribed image, a projection optical system 120 for projecting the image displayed on the display device 110 and a plurality of screens 130, 140 for dividing and projecting the image projected from the projection optical system 120, wherein each projection distance from the display device 110 to each screens 130, 140 is substantially equal.

Description

  The present invention relates to a vehicle display device that projects images onto a plurality of screens.

  Conventionally, various vehicle-related information (hereinafter also referred to as vehicle information) such as vehicle speed, engine speed, water temperature, remaining fuel, mileage, map information, guidance information, vehicle peripheral images, and audio information is referred to as a vehicle windshield. There is known a vehicle display device in which a so-called head-up display (HUD) that is displayed on a projection member such as a combiner or the like is combined with a meter display provided in an instrument panel (see, for example, Patent Document 1). .

  The vehicle display device disclosed in Patent Document 1 has one display element (display device), and projects display information in one display area on the display surface of the display element onto a screen constituting a meter display. The display information in the other display area is guided to the windshield constituting the HUD or a combiner provided inside thereof, and a compact and inexpensive vehicle display device can be provided.

JP 2002-196276 A

  However, in a configuration in which an image of a single display device is simply divided and displayed at a plurality of locations, there is a difference in the resolution of the displayed images, uneven brightness at the boundaries of the images, or distortion of the images. There was room for further improvement in terms of improving display quality due to differences in the display quality.

  Therefore, the present invention has been made paying attention to the above-described problems, and provides a vehicle display device capable of improving display quality in a vehicle display device that projects images onto a plurality of screens. It is intended.

  In order to solve the above-described problems, the present invention provides a display device that displays a predetermined image, a projection optical system that projects the image displayed on the display device, and the image that is projected from the projection optical system. And a plurality of screens projected in a divided manner, wherein the projection distances from the display device to the screens are approximately equal to each other.

  Further, at least one of the screens is not flat.

  In addition, the image has a non-display area between display areas corresponding to the screens.

In addition, it comprises display control means for outputting predetermined image data to the display device,
The display device displays the image based on the image data;
The display control means includes an image data correction unit that corrects display distortion of the image data on each screen.

  Further, as each of the screens, a first screen disposed so as to be viewed from the inside of the steering wheel, a second screen disposed so as to be viewed from the outside of the steering wheel, and transmitting the image. And a third screen leading to a projection member disposed inside the windshield or inside the windshield.

  ADVANTAGE OF THE INVENTION According to this invention, in the vehicle display apparatus which projects an image on a some screen, it becomes possible to improve display quality.

The figure which shows the general view of the display apparatus for vehicles which is the 1st Embodiment of this invention. The figure which shows the electrical constitution of the display apparatus for vehicles same as the above. The figure which shows the image in the display apparatus for vehicles same as the above. The figure which shows the general view of the display apparatus for vehicles which is the 2nd Embodiment of this invention. The figure which shows the electrical constitution of the display apparatus for vehicles same as the above. The figure which shows the image in the display apparatus for vehicles same as the above.

  Embodiments to which the present invention is applied will be described below with reference to the accompanying drawings.

  The overall configuration of the vehicle display device 100 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing an overview of a vehicle display device 100. FIG. 2 is a diagram showing an electrical configuration of the vehicle display device 100. As shown in FIG. 1, a vehicle display device 100 is disposed inside an instrument panel P of a vehicle, and a first opening provided in the instrument panel P by dividing an image 200 described later formed by a display device 110 described later. Projecting on a first screen 130, which will be described later, disposed on P1, and a second screen 140 viewed from the second opening P2, respectively, to display first and second display images V1, V2, respectively. It is.

  The vehicle display device 100 includes a display device 110, a projection optical system 120, a first screen 130, a second screen 140, a first plane mirror 150, a second plane mirror 160, and display control. The unit 170 and the storage unit 180 are mainly configured.

  The display device 110 receives light from an illumination optical system (not shown), forms an image, and emits the image as display light L1 to the projection optical system 120. For example, a transmissive display device such as a TFT liquid crystal, It consists of reflective display devices such as LCOS (Liquid Crystal On Silicon) and DMD (Digital Mirror Device). The display device 110 forms the image 200 based on the image data output from the display control unit 170.

The projection optical system 120 directs light from a first display area 201 (to be described later) of the image 200 out of the display light L1 emitted from the display device 110 to the first screen 130 via the first plane mirror 150. Projecting and projecting light from a second display area 201 (to be described later) of the image 200 out of the display light L1 toward the second screen 140 via the first plane mirror 150 and the second plane mirror 160. In this embodiment, the projection lens 121 and the free-form curved mirror 122 are included.
The projection lens 121 enlarges the image 200 of the display device 110 and forms an image on the first screen 130 and the second screen 140, and is composed of one or more lenses made of glass or a resin material.
The free-form surface mirror 122 enlarges the image 200 of the display device 110 in combination with the projection lens 121 and forms an image on the first screen 130 and the second screen 140. The surface of the base material made of a resin material A metal film having high light reflectivity such as aluminum is formed on the substrate.

  The first screen 130 is a transmissive screen that transmits the display light L1 from the projection optical system 120 and displays the first display image V1. A louver layer, a colored layer, a diffusion layer, a hard coat layer or the like for preventing insertion is formed. The first screen 130 is disposed in a first opening P1 provided in the instrument panel P, and is visually recognized by the driver from the inside of a steering wheel (not shown). In addition, S in a figure shows the range (diameter) of the said steering wheel. The first screen 130 is a curved screen that is inclined in the vertical direction according to the surface shape of the instrument panel P and curved in the vertical and horizontal directions, and is not flat.

  The second screen 140 is a reflective planar screen that reflects the display light L1 from the projection optical system 120 and displays the second display image V2, and projects it onto a base material made of a light-transmitting resin material. A lens layer, a colored layer, a diffusion layer, and the like that determine the direction of incidence and reflection of light are formed. The second screen 140 is disposed at a position corresponding to the second opening P2 provided in the instrument panel P, and is visually recognized by the driver from the outside (above) of the steering wheel through the second opening P2. Note that a window P3 made of a light-transmitting resin material is disposed in the second opening P2.

  The first plane mirror 150 is a plane mirror that reflects the display light L1 from the projection optical system 120 in the direction of the first screen 130 and the direction of the second plane mirror 160, and the surface of the base material made of a glass material. A metal film having high light reflectivity such as aluminum is formed on the substrate.

  The second plane mirror 160 is a plane mirror that reflects the display light L 1 from the projection optical system 120 in the direction of the second screen 140, and the configuration thereof is the same as that of the first plane mirror 150.

  As shown in FIG. 2, the display control means 170 is composed of a microcomputer having a CPU, a ROM, a RAM, an input / output interface, and the like. The display control means 170 acquires various vehicle information from various sensors mounted on the vehicle, ECU (Electronic Control Unit), or in-vehicle equipment such as a navigation device, and acquires image data from the storage means 180 based on the vehicle information. The image data is output to the display device 110 and the display control process of the display device 110 is performed. In addition, the display control unit 170 includes an image data correction unit 171 that corrects the image data from the storage unit 180 in accordance with a predetermined switching signal.

The storage unit 180 includes a non-volatile memory such as E ² PROM, and stores the image data indicating the image 200 displayed on the display device 110.

The vehicle display device 100 is configured by the above-described units.
In the vehicle display device 100, each part is arranged so that the projection distances Da and Db from the display device 110 to the first and second screens 130 and 140 are substantially equal to each other (Da≈Db). Note that the projection distance Da to the first screen 130 is a projection distance D1 from the projection lens 121 to the center of the free-form surface mirror 122, a projection distance D2 from the center of the free-form surface mirror 122 to the first plane mirror 150, and the first. The projection distance D3 from the flat mirror 150 to the center of the first screen 130 (Da = D1 + D2 + D3), and the projection distance Db to the second screen 140 is the projection distance D1, the projection distance D2, and the first distance. This is the sum of the projection distance D4 from the plane mirror 150 to the second plane mirror 160 and the projection distance D5 from the second plane mirror 150 to the second screen 140 (Db = D1 + D2 + D4 + D5). That is, in the present embodiment, the first screen 130 and the second screen 140 are such that the projection distance D3 and the sum (D4 + D5) of the projection distance D4 and the projection distance D5 are substantially equal (D3≈D4 + D5). By arranging the first plane mirror 150 and the second plane mirror 160, the above-mentioned conditions can be satisfied. The projection distances Da and Db may be approximated to such an extent that the difference in resolution between the display images V1 and V2 is not visually recognized by the driver.
According to such a configuration, the fineness (resolution) of the display of the first and second display images V1 and V2 displayed on the first and second screens 130 and 140 can be made equal, and the display quality can be improved. Can be improved.

Next, the image data and its correction by the display control means 170 will be described. FIG. 3 is a diagram showing an image 200 formed based on the image data. FIG. 3A shows the image 200 based on the image data before correction, and FIG. 3B shows the image data after correction. Each of the images 200 based on is shown.
As shown in FIG. 3A, the image 200 corresponds to the first display area 201 on which the image constituting the first display image V <b> 1 corresponding to the first screen 130 is drawn, and the second screen 140. Correspondingly, it is provided between the second display area 202 in which an image constituting the second display image V2 is drawn, and between the first display area 201 and the second display area 202, and no image is drawn ( And a non-display area 203 (which displays black). By providing the non-display area 203 between the first display area 201 and the second display area 202, luminance unevenness generated at the boundary between the light traveling toward the first screen 130 and the light traveling toward the second screen 140. Is no longer visible, and the display quality can be improved.

  In the present embodiment, display distortion occurs in the first display image V1 due to the curvature or inclination of the display surface of the first screen 130 that is not planar. As shown in FIG. 3B, the image 200 based on the image data after correction is preliminarily stored in the first display area 201 by the image data correction unit 171 in order to suppress display distortion on the first screen 130. In contrast to display distortion, it is distorted. The distortion amount of the image data due to this correction may be set to a predetermined value according to the arrangement and shape of the first screen 130, or may be adjustable in several steps with a switch or the like. In the corrected image 200, the first display area 201 has a substantially trapezoidal shape and the left and right sides are curved. A non-display area 203 is formed on the left and right sides of the first display area 201. In this way, by correcting the display distortion of the image data on the first screen 130, it is possible to give a degree of freedom to the arrangement and shape of the first screen 130 and improve the display quality. When display distortion occurs on the second screen 140, the image data is corrected to distort the second display area 202 in reverse to the display distortion.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  The overall configuration of the vehicle display device 300 according to the second embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram showing an overview of the vehicle display device 300. FIG. 5 is a diagram showing an electrical configuration of the vehicle display device 300. As shown in FIG. 4, the vehicular display device 300 is disposed in the instrument panel P of the vehicle, and a first opening provided in the instrument panel P by dividing an image 400 described later formed by the display device 310 described later. A first screen 330, which will be described later, disposed on P11, a second screen 340 visually recognized from the second opening P12, and a third screen 350 visually recognized from the third opening P13 through the windshield W. The first, second, and third display images V11, V12, and V13 are displayed respectively.

  The vehicle display device 300 includes a display device 310, a projection optical system 320, a first screen 330, a second screen 340, a third screen 350, a first plane mirror 360, and a second screen. It is mainly composed of a plane mirror 370, display control means 380, and storage means 390.

  The display device 310 receives light from an illumination optical system (not shown), forms an image, and emits the image as display light L11 to the projection optical system 320. For example, a transmissive display device such as a TFT liquid crystal, It consists of reflective display devices such as LCOS (Liquid Crystal On Silicon) and DMD (Digital Mirror Device). The display device 310 forms the image 400 based on the image data output from the display control unit 380.

The projection optical system 320 directs light from a first display area 401 (to be described later) of the image 400 out of the display light L11 emitted from the display device 310 toward the first screen 330 via the first plane mirror 360. Projecting and projecting light from a second display area 402 of the image 400, which will be described later, of the display light L11 toward the second screen 340, and third display area 403 of the image 400, which will be described later, of the display light L11. Is projected toward the third screen 350, and in the present embodiment, it is composed of a projection lens 321 and a free-form surface mirror 322.
The projection lens 321 enlarges the image 400 of the display device 310 and forms an image on the first screen 330, the second screen 340, and the third screen 350, and includes one or more sheets made of glass or resin material. Consists of lenses.
The free-form surface mirror 322 enlarges the image 400 of the display device 310 in combination with the projection lens 321 and forms an image on the first screen 330, the second screen 340, and the third screen 350. A metal film having high light reflectivity, such as aluminum, is formed on the surface of the base material made of.

  The first screen 330 is a transmissive screen that transmits the display light L11 from the projection optical system 320 and displays the first display image V11. A louver layer, a colored layer, a diffusion layer, a hard coat layer or the like for preventing insertion is formed. The first screen 330 is disposed in a first opening P11 provided in the instrument panel P, and is visually recognized by the driver from the inside of a steering wheel (not shown). In addition, S in a figure shows the range (diameter) of the said steering wheel. The first screen 330 is a curved screen that is inclined in the vertical direction according to the surface shape of the instrument panel P and curved in the vertical and horizontal directions, and is not flat.

  The second screen 340 is a reflective planar screen that reflects the display light L11 from the projection optical system 320 and displays the second display image V12, and projects the light onto a base material made of a light-transmitting resin material. A lens layer, a colored layer, a diffusion layer, and the like that determine the direction of incidence and reflection of light are formed. The second screen 340 is disposed at a position corresponding to the second opening P12 provided in the instrument panel P, and is visually recognized by the driver from the outside (above) of the steering wheel through the second opening P12. Note that a window P14 made of a light-transmitting resin material is disposed in the second opening P12.

  The third screen 350 is a transmission type planar screen that transmits the display light L11 from the projection optical system 320 and displays the third display image V13. The third screen 350 is attached to a base material made of a light-transmitting resin material. A louver layer, a colored layer, a diffusion layer, a hard coat layer, or the like that prevents light from entering is formed. The third screen 350 is disposed below the second screen 340 so as to be located on the same vertical line as the second screen 340. The third screen 350 is visually recognized by the driver through the windshield W and the second plane mirror 370 through the third opening P13 provided in the instrument panel P. That is, the display light L11 indicating the third display image V13 transmitted through the third screen 350 is further guided to the windshield W via the second plane mirror 370, and the display light L11 reflected by the windshield W is reflected. The third display image V13 is displayed as a virtual image on the virtual optical path L12 by being projected to the driver's eyes. Note that a window P15 made of a light-transmitting resin material is disposed in the third opening P13. Further, a dedicated combiner (projection member) that favorably reflects the display light L11 may be disposed inside the windshield W, and the display light L11 may be projected onto the combiner.

  The first plane mirror 360 is a plane mirror that reflects the display light L11 from the projection optical system 320 in the direction of the first screen 330, and has a high light reflectivity such as aluminum on the surface of a base material made of a glass material. A metal film is formed.

  The second plane mirror 370 is a plane mirror that reflects the display light L11 from the third screen 350 in the direction of the windshield W, and has the same configuration as the first plane mirror 150.

  As shown in FIG. 5, the display control means 380 is composed of a microcomputer provided with a CPU, ROM, RAM, an input / output interface, and the like. Display control means 380 obtains various vehicle information from various sensors mounted on the vehicle, ECU (Electronic Control Unit), or in-vehicle equipment such as a navigation device, and obtains image data from storage means 390 based on this vehicle information. Then, the image data is output to the display device 310 to perform display control processing of the display device 310. Further, the display control unit 380 has an image data correction unit 381 that corrects the image data from the storage unit 390 in accordance with a predetermined switching signal.

The storage unit 390 includes a non-volatile memory such as E ² PROM, and stores the image data indicating the image 400 displayed on the display device 310.

The vehicle display device 300 is configured by the above-described units.
In the vehicle display device 300, each part is arranged so that the projection distances Dc, Dd, De from the display device 310 to the first, second, and third screens 330, 340, 350 are substantially equal to each other ( Dc≈Dd≈De). The projection distance Dc to the first screen 330 is a projection distance D11 from the projection lens 321 to the center of the free curved mirror 322, a projection distance D12 from the center of the free curved mirror 322 to the first flat mirror 360, and the first. Projection distance D13 from the plane mirror 360 to the center of the first screen 330 (Dc = D11 + D12 + D13), and the projection distance Dd to the second screen 340 is calculated from the projection distance D11 and the center of the free-form surface mirror 322. It is the sum of the projection distance D14 to the second and third screens 340 and 350 (Dd = D11 + D14), and the projection distance De to the third screen 350 is the second from the center of the projection distance D11 and the free-form curved mirror 322. , And the projection distance D14 to the third screens 340 and 350 (De = D11 + D 4). That is, in the present embodiment, the first screen 330 and the second screen 340 so that the total of the projection distance D12 and the projection distance D13 (D12 + D13) and the projection distance D14 are substantially equal (D12 + D13≈D14). The above-described conditions can be satisfied by arranging the third screen 350 and the first plane mirror 360, respectively. In addition, what is necessary is just to approximate each projection distance Dc, Dd, De to such an extent that the difference in the resolution of each display image V11, V12, V13 is not visually recognized by the driver | operator.
According to this configuration, the fineness (resolution) of the display of the first, second, and third display images V11, V12, and V13 displayed on the first, second, and third screens 330, 340, and 350 is reduced. The display quality can be improved.

Next, the image data and its correction by the display control means 380 will be described. 6A and 6B are diagrams showing an image 400 formed based on the image data. FIG. 6A shows the image 400 based on the image data before correction, and FIG. 6B shows the image data after correction. The images 400 based on are respectively shown.
As shown in FIG. 6A, the image 400 is a lower area of the image 400 and corresponds to the first screen 330, and a first display area 401 in which an image constituting the first display image V11 is drawn. A second display area 402 in which an image constituting the second display image V12 corresponding to the second screen 340 is drawn, and a third area that is a central area of the image 400. 350, a third display area 403 on which an image constituting the third display image V13 is drawn, and between the first display area 401 and the third display area 403 and the second display area 402 The non-display area 404 is provided between each of the third display areas 403 and does not draw any image (becomes black display). By providing a non-display area 404 between each of the first, second, and third display areas 401, 402, and 403, light directed to the first screen 330, light directed to the second screen 340, and third The luminance unevenness generated at the boundary with the light traveling toward the screen 350 is not visually recognized, and the display quality can be improved.

  In the present embodiment, display distortion occurs in the first display image V11 due to the curvature or inclination of the display surface of the first screen 330 that is not planar. As shown in FIG. 6B, the image 400 based on the image data after correction has the first display area 401 previously stored by the image data correction unit 381 in order to suppress display distortion on the first screen 330. In contrast to display distortion, it is distorted. The distortion amount of the image data due to this correction may be set to a prescribed value according to the arrangement and shape of the first screen 330, or may be adjustable in several steps with a switch or the like. In the corrected image 400, the first display area 401 has a substantially trapezoidal shape and the left and right sides are curved. A non-display area 404 is formed on the left and right sides of the first display area 401. In this way, by correcting the display distortion of the image data on the first screen 330, it is possible to give a degree of freedom to the arrangement and shape of the first screen 330 and improve the display quality. When display distortion occurs on the second and third screens 340 and 350, the image data is corrected to distort the second and third display areas 402 and 403 in reverse to the display distortion.

  The vehicle display device 300 includes a first screen 330 arranged so as to be viewed from the inside of the steering wheel as a screen projected by dividing the image 400 formed on the display device 310; A second screen 340 disposed so as to be viewed from the outside (particularly from above) of the steering wheel, and a second screen 340 that passes through the image 400 and leads to the windshield W or the combiner disposed inside the windshield W. 3 screens 340. With this configuration, the driver of the instrument panel that is visually recognized inside the steering wheel, the over-dashboard display that is visually recognized above the steering wheel, and the head-up display that visually recognizes the display image (virtual image) on the windshield W. Various vehicle information can be displayed on the display unit in three steps in the vertical direction with different viewpoint movement distances, and information can be displayed on the optimal display unit according to the importance and urgency of the information. Visibility and driving safety can be improved.

  Needless to say, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the invention. For example, the plurality of screens in the present invention may be arranged at four or more places, or may be provided with a plurality of non-planar screens.

  The present invention relates to a vehicle display device, and is suitable for a vehicle display device that projects images onto a plurality of screens.

100, 300 Display device for vehicle 110, 310 Display device 120, 320 Projection optical system 121, 321 Projection lens 122, 322 Free-form curved mirror 130, 330 First screen 140, 340 Second screen 150, 360 First plane Mirror 160, 370 Second plane mirror 170, 380 Display control means 171, 381 Image data correction unit 180, 390 Storage means 200, 400 Image 201, 401 First display area 202, 402 Second display area 203, 404 Non-display area 350 Third screen 403 Third display area

Claims (5)

A display device that displays a predetermined image, a projection optical system that projects the image displayed on the display device, and a plurality of screens on which the image projected from the projection optical system is divided and projected. A vehicle display device comprising:
The vehicle display device, wherein projection distances from the display device to the screens are substantially equal. The vehicle display device according to claim 1, wherein at least one of the screens is not planar. The vehicle display device according to claim 1, wherein the image includes a non-display area between display areas corresponding to the screens. Display control means for outputting predetermined image data to the display device;
The display device displays the image based on the image data;
The vehicle display device according to claim 1, wherein the display control unit includes an image data correction unit that corrects display distortion of the image data on each screen. As each of the screens, a first screen disposed so as to be viewed from the inside of the steering wheel, a second screen disposed so as to be viewed from the outside of the steering wheel, and the image transmitted therethrough. 2. The vehicle display device according to claim 1, comprising at least two of a windshield or a third screen led to a projection member disposed inside the windshield.

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