JP2008257021A - Display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display apparatus capable of displaying a three-dimensional virtual image. <P>SOLUTION: The display apparatus displays first display light L1 and second display light L2 as a first virtual image V1 and second virtual images V2a, V2b and V2c. A first display device 11 emits the first display light L1 and a second display device 12 emits the second display light L2. A transmission/reflection plate 13 transmits one side of the first display light L1 and the second display light L2 and reflects the other side of the first display light L1 and the second display light L2. The first display device 11 is disposed so as to have a first predetermined angle A1 with respect to the transmission/reflection plate 13 and is provided with a first display panel 16 capable of displaying a first image P1 which expresses at least a road. The second display device 12 is disposed so as to have a second predetermined angle A2 with respect to the transmission/reflection plate 13 and is provided with a second display panel 26 capable of displaying second images P2a, P2b and P2c which express at least a preceding vehicle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device having a plurality of displays and displaying a virtual image.

Conventionally, various head-up display devices have been proposed, and for example, disclosed in Patent Document 1. Such a head-up display device reflects the display light L projected by the display device 2 disposed on the dashboard 1 of the vehicle in the direction of the driver 4 by the windshield 3 to display virtual images V1 and V2. Yes (see FIG. 9). The display device 2 includes a first display 5, a second display 6, and a half mirror 7, and these first display 5, second display 6, and half mirror 7. Is accommodated in a housing 9.
Japanese Utility Model Publication No. 63-164038

  The first display 5 is arranged with a predetermined distance a from the half mirror 7, and the display light emitted from the first display 5 passes through the half mirror 7 and is projected onto the windshield 3. The On the other hand, the second display 6 is arranged at a predetermined interval b from the half mirror 7, and the display light emitted from the second display 6 is reflected by the half mirror 7 and is reflected on the windshield 3. Projected. With such a configuration, the display device 2 can display the virtual image V <b> 1 on the first display 5 and can display the virtual image V <b> 2 on the second display 6.

The predetermined interval a between the first display 5 and the half mirror 7 is larger than the predetermined interval b between the second display 6 and the half mirror 7, and the virtual image V1 is from the driver 4 more than the virtual image V2. It is displayed at a far position. However, the display device 2 can display a plurality of virtual images V1 and V2 having different imaging positions by disposing two displays 5 and 6 having different predetermined intervals a and b from the half mirror 7. The virtual images V1 and V2 have a problem that they are planar and have no stereoscopic effect.
The present invention has been made in view of this problem, and provides a display device capable of displaying a virtual image having a stereoscopic effect.

  In order to solve the above problems, the present invention provides a first display 11 that emits the first display light L1 and a second display 12 that emits the second display light L2, as described in claim 1. And a transmissive reflection plate 13 that transmits one of the first display light L1 and the second display light L2 and reflects the other of the first display light L1 or the second display light L2. A display device that displays the first display light L1 and the second display light L2 as a first virtual image V1 and second virtual images V2a, V2b, V2c, wherein the first indicator 11 , Having a first display panel 16 that is arranged with a first predetermined angle A1 with respect to the transmission / reflection plate 13 and is capable of displaying at least the first image P1 representing a road, The display 12 has a second predetermined angle with respect to the transmission / reflection plate 13. It is arranged with a 2, and has at least a second image P2a representing a preceding vehicle, P2b, a second display panel 26 capable of displaying P2c.

  Further, according to the present invention, as described in claim 2, the preceding vehicle displayed as the second virtual images V2a, V2b, and V2c is changed in position in the vertical direction and the size is changed. Control means 62 for displaying on the second display panel 26 is provided.

  Further, according to the present invention, as described in claim 3, the control means 62 makes the preceding vehicle displayed as the second virtual images V2a, V2b, V2c large on the lower side and smaller on the upper side. And displayed on the second panel 26.

  By making the first predetermined angle of the first display panel with respect to the transmissive reflector plate different from the second predetermined angle of the second display panel with respect to the transmissive reflector plate, it is possible to display a virtual image having a stereoscopic effect.

  Hereinafter, an embodiment in which the present invention is applied to a vehicle head-up display device will be described.

The vehicle display device 10 includes a first liquid crystal display 11, a second liquid crystal display 12, a half mirror 13, and a reflector 14. The half mirror 13 is inclined and the first liquid crystal display 11 is disposed behind the half mirror 13, and the second liquid crystal display 12 is disposed below the half mirror 13. The liquid crystal displays 11 and 12, the half mirror 13 and the reflector 14 are accommodated in a housing 15.
The first liquid crystal display 11 includes a liquid crystal display panel 16, a lens member 17, a light emitting diode 18, a hard wiring board 19, a case body 20, a heat sink 21, and a prism sheet 22.

  The liquid crystal display panel 16 has a polarizing film attached to both front and rear surfaces of a TFT liquid crystal cell. The lens member 17 is made of a light-transmitting resin such as polycarbonate and has a plurality of convex lens portions 17a. The lens member 17 is disposed between the liquid crystal display panel 16 and the light emitting diode 18. The plurality of light emitting diodes 18 are arranged close to each other and are mounted on the hard wiring board 19. Each convex lens portion 17a of the lens member 17 is provided at a location corresponding to the light emitting diode 18, and condenses light emitted from the light emitting diode 18.

  The case body 20 is made of a white resin and has a substantially rectangular tube shape. The liquid crystal display panel 16 is provided at the opening end of the case body 20, and is transmitted and illuminated by the illumination light M <b> 1 emitted from the light emitting diode 18 and condensed by the lens member 17. The heat sink 21 is made of a metal (for example, aluminum) having good thermal conductivity and has a plurality of heat radiation fins 21a. The heat sink 21 is disposed on the rear surface of the hard wiring board 19 and emits heat generated by the light emitting diode 18 to the outside of the housing 15.

  The prism sheet 22 has a plurality of fine prism portions 22 a and a base material 22 b and is disposed on the front side of the liquid crystal display panel 16. The display light L1 transmitted through the liquid crystal display panel 16 is incident from the rear surface 22c of the prism sheet 22 and reflected by the prism portion 22a (see FIG. 3). The rear surface 22 c of the prism sheet 22 is parallel to the liquid crystal display panel 16.

  The second liquid crystal display 12 includes a liquid crystal display panel 26, a lens member 27, a light emitting diode 28, a hard wiring board 29, a case body 30, a heat sink 31, and a cold mirror 32.

  The liquid crystal display panel 26 has a polarizing film attached to both front and rear surfaces of a TFT type liquid crystal cell. The lens member 27 has a plurality of convex lens portions 27a. The plurality of light emitting diodes 28 are arranged close to each other and are mounted on the hard wiring board 29. Each convex lens portion 27a of the lens member 27 is provided at a location corresponding to the light emitting diode 28, and condenses light emitted from the light emitting diode 28.

  The case body 30 is made of a white resin, and a liquid crystal display panel 26 is provided at the opening end of the case body 30. The liquid crystal display panel 26 is transmitted and illuminated by the light emitting diode 28. The heat sink 31 has heat radiating fins 31 a and is disposed on the rear surface of the hard wiring board 29. The heat sink 31 emits heat generated by the light emitting diode 18. The cold mirror 32 reflects the illumination light M2 made of visible light emitted from the light emitting diode 28 and transmits the infrared light IR.

  The half mirror 13 is formed by depositing a reflective film on a glass substrate, and is disposed in an inclined manner in the housing 15. The half mirror 13 transmits the display light L1 emitted from the first display device 11 and reflects the display light L2 emitted from the second display device 12. The liquid crystal display panel 16 is disposed with a first predetermined angle A1 with respect to the half mirror 13, and the liquid crystal display panel 26 is disposed with a second predetermined angle A2 with respect to the half mirror 13. (See FIG. 4).

  The reflector 14 includes a concave mirror 48, a mirror holder 49, a gear 50 and a stepping motor 51. The concave mirror 48 reflects the display lights L1 and L2 and projects them onto the windshield of the vehicle. The concave mirror 48 is bonded to the mirror holder 49 with a double-sided adhesive tape. The concave mirror 48 is formed by depositing aluminum (Al) on a resin such as polycarbonate (PC) to form a reflective film. The mirror holder 49 is made of a resin such as PBT, and a gear portion 49a and a shaft portion 49b are integrally formed. The shaft portion 49 b is pivotally supported by a bearing portion (not shown) provided in the housing 15.

  The stepping motor 51 rotates the concave mirror 48 to adjust the projection direction of the display light L. The gear 50 is attached to the rotating shaft of the stepping motor 51, and meshes with the gear portion 49a. The driver 4 operates a push button switch (not shown) to adjust the angle of the concave mirror 48 so that the display light L is reflected at the position of the eyes.

  The housing 15 includes an upper case 61 and a lower case 62, and the upper case 61 is provided with a window portion 64 from which the display light L is emitted. This window part 64 consists of translucent resin (for example, acrylic), and has a curved shape. The upper case 61 of the housing 15 is provided with a light shielding wall 15a, and external light such as sunlight enters the liquid crystal displays 11 and 12, and the virtual images V1, V2a, V2b, and V2c become difficult to see (washout). Is preventing. The light shielding wall 15 a has a flat plate shape and is formed so as to hang obliquely from the upper part of the upper case 61.

FIG. 5 is a block diagram showing an electrical configuration of the vehicle display device 10. An inter-vehicle distance sensor 61 detects the inter-vehicle distance between the host vehicle and the preceding vehicle, and outputs inter-vehicle distance data to the control unit 62 (control means). The control unit 62 displays the image P1 on the liquid crystal display panel 16 via the drive circuit 63 and displays the images P1, P2a, P2b, and P2c on the liquid crystal display panel 26 via the drive circuit 64 (FIG. 6). reference).
The image P1 displayed on the liquid crystal display panel 16 is a schematic representation of a road, and is depicted in perspective, with a distant portion being narrow and a nearby portion being wide. Images P1, P2a, P2b, and P2c displayed on the liquid crystal display panel 26 schematically represent a preceding vehicle traveling in front of the host vehicle.

  The control unit 62 selectively displays the images P2a, P2b, and P2c on the liquid crystal display panel 26 while changing the size while moving in the vertical direction based on the inter-vehicle distance data input from the inter-vehicle distance sensor 61. . The image P2a displayed on the liquid crystal display panel 26 is displayed larger and lower than the image P2b, and the image P2c is displayed smaller and higher than the image P2b.

  Next, the images P1, P2a, P2b, and P2c displayed on the liquid crystal display panels 16 and 26 and the virtual images V1, V2a, V2b, and V2c will be described in detail with reference to FIGS. The liquid crystal display panel 16 displays an image P1 indicating a road, and the virtual image V1 is displayed by the display light L1 emitted from the liquid crystal display 11 (see FIGS. 6A and 7A). The liquid crystal display panel 16 is inclined with respect to the line-of-sight direction, and the virtual image V1 is displayed substantially horizontally in a side view (see FIG. 7B).

  The liquid crystal display panel 26 alternatively displays images P2a, P2b, and P2c indicating the preceding vehicle, and the virtual images V2a, V2b, and V2c are alternatively displayed by the display light L2 emitted from the liquid crystal display 12. (See FIG. 6B and FIG. 7A). The liquid crystal display panel 26 is disposed substantially perpendicular to the line-of-sight direction, and the virtual images V2a, V2b, and V2c are displayed substantially vertically when viewed from the side (see FIG. 7B).

  Although the virtual images V2a, V2b, and V2c are located on the same vertical plane, there is a fact that the vehicle is on the road. And appears to be located immediately above the virtual image V1 indicating the road (see FIG. 7B). Further, the virtual image V2c indicating the preceding vehicle is located at a position Xc farther than the virtual image V2b, and appears to be positioned immediately above the virtual image V1 indicating the road.

  According to the present embodiment, the virtual image V1 can be displayed on the liquid crystal display panel 16, and the virtual images V2a, V2b, and V2c can be displayed on the liquid crystal display panel 26. The first of the liquid crystal display panel 16 with respect to the half mirror 13 can be displayed. By making the predetermined angle A1 different from the second predetermined angle A2 of the liquid crystal display panel 26 with respect to the half mirror 13, a stereoscopic effect is generated in the virtual images V1, V2a, V2b, and V2c. Further, the stereoscopic effect is improved by changing the position and the size of the preceding vehicle displayed as the virtual images V2a, V2b, and V2c in the vertical direction.

  The present invention is not limited to this embodiment, and various modifications are possible. For example, the positions of the liquid crystal display panel 16 and the liquid crystal display panel 26 are different as in the other embodiment shown in FIG. Even if it is replaced, the same effect can be obtained.

Sectional drawing which shows embodiment of this invention. The general-view figure of the head up display which shows embodiment same as the above. The expanded sectional view of the prism sheet which shows embodiment same as the above. The principal part enlarged view which shows embodiment same as the above. The block diagram which shows embodiment same as the above. The front view of the liquid crystal display panel which shows embodiment same as the above. Virtual image explanatory drawing which shows embodiment same as the above. The principal part enlarged view which shows other embodiment of this invention. FIG. 6 is an overview diagram of a head-up display showing a conventional example.

Explanation of symbols

10 Display device 11 Liquid crystal display (first display)
12 Liquid crystal display (second display)
13 Half mirror (transmission reflector)
16 Liquid crystal display panel (first display panel)
26 Liquid crystal display panel (second display panel)
62 Control part (control means)
L1 first display light L2 second display light A1 first predetermined angle A2 second predetermined angle V1 first virtual image V2 second virtual image V2a second virtual image V2b second virtual image V2c second virtual image P1 First image P2a Second image P2b Second image P2c Second image

Claims (3)

A first display that emits first display light; a second display that emits second display light; and one of the first display light and the second display light is transmitted and the first display light is transmitted. A display that reflects the other of the display light and the second display light, and displays the first display light and the second display light as a first virtual image and a second virtual image. A device,
The first display is disposed with a first predetermined angle with respect to the transmissive reflector, and has a first display panel capable of displaying at least the first image representing a road,
The second display device has a second display panel that is arranged with a second predetermined angle with respect to the transmissive reflection plate and can display at least a second image representing a preceding vehicle. Display device.   2. A control means for displaying the preceding vehicle displayed as the second virtual image on the second display panel by changing the position in the vertical direction and changing the size thereof. The display device described in 1.   The said control means displays the said preceding vehicle displayed as said 2nd virtual image on said 2nd panel so that it may become large on lower side and it may become small on upper side, The said 2nd panel is characterized by the above-mentioned. Display device.

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