JP2006171465A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of performing deep display, without complicating the manufacturing processes in the display device for displaying a virtual image by making the display light reflected. <P>SOLUTION: The display device is equipped with a reflection member 13 disposed to face an observer D, a display panel (organic EL panel) 11 of a spontaneous light emission type to emit first display light L1 to the reflection member 13, a reflective layer formed on the display panel, and a display unit 12 to project a second layer light to the display panel 11. The first display light L1 is reflected toward the observer D by the reflection member 13, to form the first virtual image V1, and the second display light L2 is reflected toward the reflection member 13 by the reflective layer and is further reflected toward the observer D by the reflection member 13, to form the second virtual image V2 located further away than the first virtual image V1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device that forms a virtual image by reflecting display light by a reflecting member.

  Conventionally, various display devices called head-up display devices that display a virtual image by reflecting display light emitted from a light-emitting display have been proposed as display devices (see, for example, Patent Document 1). FIG. 6 shows an example of a head-up display device. The head-up display device 1 is disposed on a dashboard or the like of a vehicle, and reflects the display light 2a emitted from the light emitting display 2 toward the line of sight of the observer 4 by the reflecting member 3 to display a virtual image 5. It is.

Further, the head-up display device includes a plurality of light sources corresponding to a plurality of virtual images, and a part of the light sources is optically optically enlarged to extend a distance separated in a direction toward the virtual image viewpoint position. Some display a deep image by displaying a plurality of virtual images with different distances from the observer's viewpoint through a magnifying means (see, for example, Patent Document 2).
Japanese Utility Model Publication No. 63-9041 Japanese Utility Model Publication No. 3-109925

  However, such a head-up display device must include dedicated optical enlargement means such as a lens and a spherical mirror in order to form a plurality of virtual images with different distances from the observer's viewpoint, and from a plurality of light sources. Since the emission position of the emitted display light is different, in order to make all virtual images visible to the observer in the same direction, the positions of the light sources and the optical expansion means with respect to the reflecting member that reflects the display light to the observer There is a problem that the relationship needs to be adjusted precisely and the manufacturing process of the head-up display device becomes complicated.

  The present invention has been made in view of this problem, and in a display device that reflects a display light and displays a virtual image, a display device that can perform a deep display without complicating the manufacturing process. It is to provide.

  In order to solve the above problems, a display device according to the present invention includes a reflective member disposed facing an observer, a self-luminous display panel that projects first display light onto the reflective member, A reflective layer formed on the display panel; and a display that projects the second display light onto the display panel, and the first display light is reflected toward the observer by the reflective member. A first virtual image is formed, the second display light is reflected by the reflective layer toward the reflective member, and further reflected by the reflective member toward the observer so as to be more than the first virtual image. It is characterized by forming a second virtual image located far away.

  According to the present invention, the display panel includes an organic EL element formed by laminating a transparent electrode, an organic layer having at least a light emitting layer, and a non-translucent back electrode on a translucent substrate. The reflective layer is composed of the back electrode.

  In the invention, it is preferable that the reflecting member is a concave mirror.

  Moreover, the present invention is characterized in that the display emits light having a color different from that of the first display light as the second display light.

  In the invention, it is preferable that the display panel reflects the second display light at a non-light emitting portion.

  The display panel may be configured such that at least a reflection region of the second display light is not displayed when the second display light is projected from the display.

  In addition, the present invention is characterized in that the first and second virtual images are displayed in an overlapping manner.

  In the invention, it is preferable that the display panel displays a vehicle state as the first virtual image.

  Further, the present invention is characterized in that the display unit displays vehicle warning information as the second virtual image.

  The present invention relates to a display device that forms a virtual image by reflecting display light by a reflecting member, and can perform display with a depth without complicating the manufacturing process.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, and the case where the present invention is applied to a head-up display device for a vehicle will be described as an example.

  As shown in FIG. 1, the head-up display device 10 is disposed at an organic EL panel (display panel) 11, a display 12 that faces the organic EL panel 11, and a position that faces the line of sight of the viewer D. It is mainly composed of a reflecting member 13 and a case body 14 that houses the organic EL panel 11 and the projection member 12. In the vehicle head-up display device, an observer D is a person who gets on the vehicle such as a driver or a passenger on the passenger seat.

  The organic EL panel 11 is disposed in the case body 14 so as to face the reflecting member 13 at a predetermined angle. As shown in FIG. 2, the transparent electrode 11b is disposed on the translucent substrate 11a. , An insulating layer 11c, an organic layer 11d, and a back electrode 11e are sequentially laminated to form an organic EL element, and a sealing member 11f is interposed with an ultraviolet curable adhesive 11g so as to airtightly cover the organic EL element. The self-luminous display panel is provided on the substrate 11a.

  The substrate 11a is a rectangular support substrate made of, for example, a glass material.

  The transparent electrode 11b is formed by forming a light-transmitting conductive material such as ITO in a layer shape on the substrate 11a by means such as vapor deposition or sputtering, and further forming it into a predetermined shape by means such as photolithography etching. It will be. The transparent electrode 11b is electrically connected to a constant current source (not shown) and serves as an anode for injecting holes into the organic layer 11d.

  The insulating layer 11c is formed, for example, by forming a polyimide-based insulating material in a layer shape by means such as a sputtering method, and further forming the insulating layer 11c into a predetermined shape by means such as photolithography etching. The insulating layer 11c has a window corresponding to the transparent electrode 11b. In order to clearly display the outline of the light emitting region, the window is formed so as to slightly overlap the peripheral edge of the transparent electrode 11b. The insulation between 11b and the back electrode 11e is ensured.

  The organic layer 11d is disposed on the transparent electrode 11b and may have at least a light emitting layer. In the embodiment of the present invention, the hole injection layer, the hole transport layer, the light emitting layer, and the electron transport are used. The layers are sequentially laminated by means such as vapor deposition. In the present embodiment, the organic layer 11d emits blue-green light.

  The back electrode 11e is formed by forming a non-translucent and reflective conductive material such as aluminum (Al) or magnesium silver (Mg: Ag) on the organic layer 11d by means such as vapor deposition. This is a single metal electrode (non-translucent electrode) having a rectangular shape, and serves as a common electrode of the light emitting portion in the organic layer 11d. The back electrode 11e is electrically connected to the constant current source and serves as a cathode that injects electrons into the organic layer 11d. The back electrode 11 e is a reflective layer that reflects the second display light L <b> 2 emitted from the display device 12 toward the reflective member 13.

  The sealing member 11f is formed by forming a flat plate member made of, for example, a glass material into a concave shape by means such as cutting or etching. The sealing member 11f is hermetically disposed on the substrate 11a via an ultraviolet curable adhesive 11g, so that the sealing member 11f and the substrate 11a constitute an airtight space for housing the organic EL element. ing.

  The organic EL panel 11 configured as described above emits blue-green first display light L1 from the organic layer 11d by applying a predetermined constant current to the transparent electrode 11b and the back electrode 11e, and is opposed to the substrate 11a. The first display light L <b> 1 is emitted toward the reflecting member 13.

  The display device 12 is a light-emitting display device disposed in the case body 14 so as to face the organic EL panel 11. For example, the display device 12 has a color different from that of the first display light L <b> 1 emitted from the organic EL panel 11. The liquid crystal display device includes a light source composed of an LED or a bulb that emits light (red in the present embodiment) and a liquid crystal panel that transmits light from the light source. As shown in FIG. 2, the red second display light L <b> 2 emitted from the display device 12 is reflected toward the reflection member 13 by the back electrode 11 e of the organic EL panel 11. The display device 12 may include a plurality of light sources having different emission colors and switch the display color of the second display light L2, or may emit a plurality of different colors of the second display light L2.

  The reflecting member 13 is a concave mirror in which a metal material such as aluminum is vapor-deposited on a resin material such as polycarbonate to form a concave reflecting surface 13a. And it arrange | positions so that the organic electroluminescent panel 11 may be opposed. The reflecting member 13 receives the first display light L1 from the organic EL panel 11 and the second display light L2 from the display 12 reflected by the back electrode 11e of the organic EL panel 11, and receives the observer D's Reflected toward the line of sight, the viewer D enlarges and visually recognizes the first virtual image V1 based on the first display light L1 and the second virtual image V2 based on the second display light L2. The reflecting member of the present invention may be a windshield of a vehicle or a combiner disposed on the windshield.

  The case body 14 is made of a resin material and accommodates the organic EL panel 11 and the display device 12. The case body 14 is provided with an opening 14a through which the first and second display lights L1 and L2 are emitted. The opening 14a is made of a light-transmitting resin material such as acrylic. A cover 14b is provided.

  As shown in FIG. 3, the head-up display device 10 has a vehicle speed (“100 Km / h” in FIG. 3) as a first virtual image V <b> 1 by the first display light L <b> 1 emitted from the organic EL panel 11. Number display). Further, the display device 12 is driven to emit light based on the warning signal based on various information, and the second display light L2 emitted from the display device 12 displays a circular mark indicating the vehicle warning information as the second virtual image V2. To do. In the second virtual image V2, the second display light L2 is emitted from the display 12, and is first reflected toward the reflecting member 13 by the back electrode 11e of the organic EL panel 11, and then from the reflecting member 13 to the observer D. By being reflected toward the line of sight, the distance between the display 12 and the organic EL panel 11 is more distant than the first virtual image V1. At this time, the organic layer 11d does not emit light in the reflective region that reflects at least the second display light L2 in the organic EL panel 11 so that the first and second virtual images V1 and V2 having different display contents do not overlap. Set to non-display state. Alternatively, the second display light L2 may be reflected at a non-light emitting portion of the organic EL panel 11. The vehicle warning information may be, for example, a warning related to a vehicle state such as a vehicle speed or an engine speed, a warning related to approach to another vehicle, or the like. Further, the vehicle warning information may be displayed by letters or numbers.

  The head-up display device 10 is formed on the organic EL panel 11 and the reflective member 13 disposed to face the observer D, the organic EL panel 11 that projects the first display light L1 onto the reflective member 13, and the organic EL panel 11. And a display 12 that projects the second display light L2 onto the organic EL panel 11, and the first display light L1 is reflected on the line of sight of the observer D by the reflection member 13. The second display light L2 is reflected toward the reflecting member 13 by the back electrode 11e of the organic EL panel 11, and further the line of sight of the observer D is reflected by the reflecting member 13. And a second virtual image V2 positioned farther than the first virtual image V1 is formed by being reflected toward the first.

  With this configuration, by reflecting the second display light L2 for forming the second virtual image V2 located farther than the first virtual image V1 by the back electrode 11e provided in advance in the organic EL panel 11, Since there is no need to use a special extension member (optical enlargement means in the cited document 2) that extends the distance of the second display light L2 to the viewpoint of the observer D, the number of parts of the head-up display device 10 is reduced. The first display light L1 emitted from the organic EL panel 11 by adjusting the positional relationship of the organic EL panel 11 with respect to the reflecting member 13 that reflects the display light toward the observer D can be reduced. And the second display light L2 emitted from the display 12 and the emission direction of both display lights can be adjusted. Without complicating the comparison to the manufacturing process and engagement, it is possible to obtain a virtual image display with depth.

  Moreover, by using a concave mirror as the reflecting member 13, the first and second virtual images V1, V2 can be enlarged and displayed.

  Further, in the head-up display device 10 disposed in the vehicle, the vehicle state is displayed as the first virtual image V1, and the vehicle warning information is displayed as the second virtual image V2, so that the vehicle is a normal display. By displaying a warning image of a highly urgent vehicle as a second virtual image V2 located far from the first virtual image V1 for displaying the state, that is, in the vicinity of the scenery in front of the vehicle, the observer D is urgently displayed. It is possible to instantly adjust the viewpoint to a highly reliable display, and to improve the visibility of warning information. Moreover, the visibility of warning information can be improved when the indicator 12 emits light having a color different from that of the first display light L1 as the second display light L2. In addition, when the organic EL panel 11 projects the second display light L2 from the display 12, at least the reflection area of the second display light L2 is in the non-display state, so that the first display contents differ from each other. , The second virtual images V1 and V2 can be suppressed from being visually recognized by the observer D, and display visibility can be improved. In addition, also when reflecting the 2nd display light L2 in the non-light-emission part of the organic electroluminescent panel 11, superimposition of 1st, 2nd virtual image V1, V2 can be suppressed similarly.

  In the head-up display device 10 according to the embodiment of the present invention, the first and second virtual images V1 and V2 are displayed so as not to overlap each other. In this way, the first and second virtual images V1 and V2 may be displayed in a form in which at least a part of each other is superimposed. 4 and 5 are diagrams illustrating display examples in which the first and second virtual images V1 and V2 are displayed in an overlapping manner on the head-up display device 10. FIG. In FIG. 4, the second virtual image V2 indicating the warning information of the vehicle is displayed as the background of the first virtual image V1. In FIG. 5, the second virtual image V2 indicating the shadow portion of the first virtual image V1 is displayed so as to partially overlap the first virtual image V1, and a display having a depth can be obtained. Yes.

1 is a cross-sectional view of a main part showing a head-up display device according to an embodiment of the invention. Sectional drawing which shows the organic electroluminescent panel with which it is equipped. The figure which shows the example of a display same as the above. The figure which shows the other example of a display same as the above. The figure which shows the other example of a display same as the above. The figure which shows the conventional head-up display apparatus.

Explanation of symbols

10 Head-up display device (display device)
11 Organic EL panel (display panel)
11a Substrate 11b Transparent electrode 11c Insulating layer 11d Organic layer 11e Back electrode 12 Display 13 Reflecting member 14 Case body D Viewer L1 First display light L2 Second display light V1 First virtual image V2 Second virtual image

Claims (9)

A reflective member disposed to face the observer;
A self-luminous display panel that projects first display light onto the reflective member;
A reflective layer formed on the display panel;
A display for projecting a second display light on the display panel,
The first display light is reflected by the reflective member toward the observer to form a first virtual image, and the second display light is reflected by the reflective layer toward the reflective member, Further, the display device is formed by reflecting the reflection member toward the observer to form a second virtual image located farther from the first virtual image. The display panel comprises an organic EL panel in which an organic EL element formed by laminating a transparent electrode, an organic layer having at least a light emitting layer, and a non-translucent back electrode is formed on a translucent substrate. The display device according to claim 1, wherein the reflective layer includes the back electrode. The display device according to claim 1, wherein the reflecting member is a concave mirror. The display device according to claim 1, wherein the display device emits light having a color different from that of the first display light as the second display light. The display device according to claim 1, wherein the display panel reflects the second display light at a non-light emitting portion. 2. The display according to claim 1, wherein when the second display light is projected from the display, at least a reflection area of the second display light is in a non-display state. apparatus. The display device according to claim 1, wherein the first and second virtual images are displayed by superimposing at least a part of each other. The display device according to claim 1, wherein the display panel displays a vehicle state as the first virtual image. The display device according to claim 1, wherein the display device displays vehicle warning information as the second virtual image.

Images