JP2017116888A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device in which no difference in brightness occurs between a region corresponding to an irradiation area and a region other than that, and a frame corresponding to a contour of the irradiation area is prevented from being projected in a virtual image.SOLUTION: A display device includes a transmission type screen 26, a holding member which contains an opening part 22b which makes an exposed part 26a being a part of the transmission type screen 26 exposed, to hold the transmission type screen 26 from an outer periphery, and a projector which radiates display light toward the transmission type screen 26. The projector radiates display light to an irradiation area 29 containing the exposed part 26a of the transmission type screen 26.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a display device.

  Conventionally, a head-up display device that displays various information to a viewer (mainly a driver) is known as a display device. This head-up display device causes a viewer to visually recognize a virtual image including various types of information by irradiating the projection member with display light from a display device.

  For example, the head-up display device described in Patent Document 1 includes a transmissive screen 200, a holding frame 300 that holds the transmissive screen 200 from the outer periphery, and a transmissive type as illustrated in FIG. A projector (not shown) that irradiates the screen 200 with display light. The holding frame 300 includes an opening 300 a that exposes the exposed portion 200 a of the transmissive screen 200. The display light from the projector is irradiated to the irradiation area 100a smaller than the exposed portion 200a in the exposed portion 200a of the transmissive screen 200.

JP 2014-115408 A

  In the configuration described in Patent Document 1, a frame corresponding to the outline of the irradiation area 100a and a frame corresponding to the inner peripheral surface of the opening 300a of the holding frame 300 are displayed in the virtual image. For this reason, a double frame is displayed on the virtual image, which causes a reduction in display quality. Further, as shown in FIG. 6B, in the exposed portion 200a of the transmissive screen 200, a difference in luminance occurs between the region 101 corresponding to the irradiation area 100a and the other region 102. The display quality also deteriorates due to the contrast of light and dark caused by this. Such a deterioration in display quality becomes even more pronounced when the surroundings are dark or when external light enters the head-up display device.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a display device in which deterioration of display quality is suppressed.

  The display device according to the present invention has a transmissive screen, a holding member that holds an exposed portion that is a part of the transmissive screen, and holds the transmissive screen from an outer periphery, and the transmissive screen. A projector that irradiates display light toward the projector, and the projector irradiates the irradiation area including the exposed portion of the transmissive screen with the display light.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus with which the display quality fall was suppressed can be provided.

It is the schematic which shows the vehicle carrying the head-up display apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the whole structure of the head-up display apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the transmission type screen and holding member which concern on one Embodiment of this invention. It is a front view of the holding member holding the transmission type screen concerning one embodiment of the present invention. (A) which concerns on one Embodiment of this invention is the figure which showed the positional relationship of an irradiation area and the holding member holding a transmissive screen, (b) is the display along the XX line of (a). It is a graph which shows the brightness | luminance of light. (A) which concerns on background art is the figure which showed the positional relationship of an irradiation area and the holding member holding a transmissive screen, (b) is the brightness | luminance of the display light along the YY line of (a). It is a graph to show.

  A head-up display device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIG. 1, the head-up display device 2 is an example of a display device, and is provided on a dashboard 1 of a vehicle. The head-up display device 2 irradiates the display light L toward a windshield 3 that is an example of a projection member. The vehicle driver 4 receives the display light L reflected on the windshield 3 and visually recognizes the virtual image V superimposed on the landscape.

  As shown in FIG. 2, the head-up display device 2 includes a first unit A, a second unit B, and a control unit 12. The first unit A includes the holding member 20, the transmission screen 26, the first housing 41, the optical system 11, and the projector 10. The second unit B includes reflectors 50 and 60 and a second housing 71.

  As shown in FIG. 2, the first housing 41 is made of an opaque resin such as polypropylene and houses the projector 10, the optical system 11, and the like. The first housing 41 includes a base plate 41b and a dome-shaped cover portion 41c that fits on the outer periphery of the base plate 41b. The base plate 41b is formed in a substantially rectangular plate shape, and is simply shown in FIG. 2, but precisely, the projector 10 and the optical system 11 are fixed to the lower surface thereof. The base plate 41b is formed with an opening 41a through which the display light L from the projector 10 passes. The opening 41a is formed in a rectangular shape, for example, and communicates from the internal space of the first unit A to the internal space of the second unit B as shown in FIG.

  As shown in FIG. 2, the projector 10 generates display light L by, for example, a field sequential method under the control of the control unit 12 and irradiates the generated display light L toward the optical system 11. The optical system 11 is simply shown in FIG. 2, but is precisely composed of, for example, a pair of plane mirrors. One of the plane mirrors reflects the display light L from the projector 10 toward the other side of the plane mirror. The other of the plane mirrors reflects the display light L from one of the plane mirrors so that the display light L passes through the opening 41a.

As shown in FIG. 3, the holding member 20 is formed of a light-shielding resin and includes a base portion 21 and a frame lid portion 22 that are formed separately from each other.
The base portion 21 includes a flange portion 21a having a substantially rectangular plate frame shape, and a rectangular tubular portion 21b connected to the inner periphery of the flange portion 21a. A plurality of through holes 21c are formed in the flange portion 21a. By inserting screws (not shown) through the through holes 21 c and fixing them to the first housing 41, the flange portion 21 a and thus the holding member 20 are fixed around the opening 41 a of the first housing 41.

  The cylindrical portion 21b is connected to the flange portion 21a at the base end side, and includes a rectangular frame-shaped end surface 21d on the distal end side of the cylindrical portion 21b. The end surface 21d of the cylinder part 21b forms an angle inclined with respect to the flange part 21a. In addition, a transmission hole 21e having an area smaller than the transmission screen 26 and a recess 21f into which the outer periphery of the transmission screen 26 is fitted along the peripheral edge of the transmission hole 21e are formed on the end surface 21d of the cylindrical portion 21b. . A pair of fitting holes 21g is formed above the recess 21f on the end surface 21d of the cylindrical portion 21b. The pair of fitting holes 21g are located corresponding to the corners of the end surface 21d of the cylindrical portion 21b.

  The frame lid portion 22 has a rectangular frame shape having an opening 22b. In addition, a pair of fitting convex portions 22a that fit into the fitting holes 21g of the cylindrical portion 21b are provided on the end surface of the frame lid portion 22 on the cylindrical portion 21b side. In a state where the transmissive screen 26 is fitted in the concave portion 21f of the cylindrical portion 21b, the fitting convex portion 22a of the frame lid portion 22 is fitted into the fitting hole 21g of the cylindrical portion 21b, whereby the transmissive screen 26 is It is sandwiched and held between the portion 21 b and the frame lid portion 22. At this time, as shown in FIG. 4, the exposed portion 26 a of the transmissive screen 26 is exposed from the opening 22 b of the frame lid portion 22. The exposed portion 26 a is formed in a region of the transmissive screen 26 excluding the outer periphery held by the holding member 20. As shown in FIG. 2, the transmission screen 26 is held by the holding member 20 in a posture substantially orthogonal to the display light L.

  As shown in FIG. 3, the transmissive screen 26 is formed in a rectangular plate shape, receives the display light L from the projector 10 that has passed through the optical system 11, and transmits the display light L to the other surface side. To form an image.

  As shown in FIG. 5A, the display light L that has passed through the optical system 11 from the projector 10 is exposed to the exposed portion 26a of the transmissive screen 26 (in other words, the opening of the frame lid portion 22 that defines the exposed portion 26a). 22b) The irradiation area 29 having a larger area is irradiated. The irradiation area 29 is an area where the display light L is irradiated on the transmissive screen 26. For example, the optical path length of the display light L from the projector 10 to the transmissive screen 26, and the cross-sectional area of the emitted light from the projector 10. Determined by etc. In this example, the irradiation area 29 has a rectangular shape that is long in the same direction as the frame lid portion 22 and the transmission screen 26, and the outline 29 a of the irradiation area 29 is located on the frame lid portion 22. The luminance in the irradiation area 29 is set to be substantially constant.

  The control unit 12 generates an image based on information from an in-vehicle ECU (Electronic Control Unit) (not shown), and irradiates the display light L corresponding to the image through the projector 10. Specifically, as shown in FIG. 5A, the control unit 12 sets a region that overlaps the holding member 20 in the irradiation area 29 to a non-drawing area 29 o that does not draw, and the transmission screen in the irradiation area 29. An area overlapping with the 26 exposed portions 26a is set as a drawing area 29i for drawing. The drawing area 29i is formed in the same rectangular shape as the exposed portion 26a of the transmissive screen 26, and the non-drawing area 29o is formed in a rectangular frame shape surrounding the outer periphery of the drawing area 29i. That is, the control unit 12 does not include information on what is irradiated with light in the non-drawing area 29o via the projector 10, but includes information only in the drawing area 29i. For example, the control unit 12 preferably sets the non-drawing area 29o to the same color as the background color of the drawing area 29i. Thereby, when the non-drawing area 29o is displayed on the virtual image V because the irradiation area 29 is displaced with respect to the transmission screen 26, it is possible to reduce a sense of discomfort given to the viewer.

  As shown in FIG. 2, the control unit 12 includes a nonvolatile memory 12a. In the memory 12a, a drawing area 29i and a non-drawing area 29o are stored in advance. The memory 12a stores a drawing area 29i and a non-drawing area 29o suitable for the model of the head-up display device 2. Each head-up display device 2 is suitable for its own irradiation area 29 because the size of the irradiation area 29 may vary depending on the model of the head-up display device 2 due to the optical path length described above. A drawing area 29i and a non-drawing area 29o are stored. Note that, in the head-up display device 2, it is assumed that models with different irradiation areas 29 and the like are mounted depending on the vehicle type on which the head-up display device 2 is mounted due to restrictions on the installation space and the vehicle body shape.

  By setting the irradiation area 29 as described above, it is possible to make the luminance at the exposed portion 26a of the transmissive screen 26 and consequently the luminance at the virtual image V constant as shown in FIG. In FIG. 5B, only the luminance along the short direction of the transmissive screen 26 is shown, but the luminance along the longitudinal direction of the transmissive screen 26 is also constant.

  Returning to FIG. 2, the reflector 50 includes a plane mirror 51 and a support member 52. The plane mirror 51 is disposed so as to be inclined at an angle of approximately 45 ° behind the direction perpendicular to the direction of the display light L on which the surface is incident. The plane mirror 51 reflects the incident display light L perpendicular to the incident direction, that is, in the direction of the concave mirror 61. The support member 52 is fixed to the second housing 71 and holds the plane mirror 51.

  The reflector 60 includes a concave mirror 61, a mirror holder 62, a stepping motor 63, and a support member 64. The concave mirror 61 is obtained by evaporating a metal such as aluminum on a resin such as polycarbonate to form a reflective surface 61a. The reflecting surface 61 a is a concave surface and receives the display light L reflected by the plane mirror 51. Further, the concave mirror 61 generates a virtual image V by enlarging and reflecting the display light L reflected from the plane mirror 51. The concave mirror 61 is bonded to the mirror holder 62 with, for example, a double-sided adhesive tape. The mirror holder 62 is made of a resin such as ABS, and the gear portion 65 and the shaft portion 66 are integrally formed.

  A gear 67 is attached to the rotation shaft of the stepping motor 63, and the gear 67 meshes with the gear portion 65 of the mirror holder 62. The concave mirror 61 is supported in a rotatable state together with the mirror holder 62, and the concave mirror 61 can be rotated by the stepping motor 63, whereby the projection direction of the display light L can be adjusted. The vehicle driver 4 operates the input device such as a push button switch (not shown) to adjust the angle of the concave mirror 61 so that the display light L is reflected at the eye position and the virtual image V can be visually recognized.

  The second housing 71 is made of an opaque resin such as polypropylene and accommodates the reflectors 50 and 60. An opening 71 a through which the display light L is emitted is formed on the upper surface of the second housing 71. A translucent cover 72 is attached to the opening 71a. The translucent cover 72 is made of a transparent resin such as polycarbonate and has a curved shape.

  The second housing 71 is provided with a light shielding wall 71b for blocking external light such as sunlight incident from the opening 71a. The light shielding wall 71b has a flat plate shape and is made of a material that does not transmit light. Further, the light shielding wall 71 b hangs obliquely from the upper part of the second housing 71, and the hanging surface is positioned between the opening 71 a and the transmissive screen 26. Thereby, the phenomenon (washout) in which the external light is incident on the transmission screen 26 and the virtual image V becomes difficult to be seen due to the light shielding wall 71b receiving the external light passing through the opening 71a is suppressed.

In the present embodiment, the head-up display device 2 has a transmissive screen 26 and an opening 22b that exposes an exposed portion 26a that is a part of the transmissive screen 26, and holds the transmissive screen 26 from the outer periphery. The member 20 and the projector 10 that irradiates the display light L toward the transmissive screen 26 are provided. In addition, the projector 10 irradiates the irradiation area 29 including the exposed portion 26 a of the transmissive screen 26 with the display light L.
According to this configuration, the entire area of the exposed portion 26 a of the transmission screen 26 is within the irradiation area 29, so that the outer shape line 29 a of the irradiation area 29 is suppressed from being positioned within the exposed portion 26 a of the transmission screen 26. . For this reason, as described in the background art above, it is possible to suppress the external line 29a of the irradiation area 29 and the opening 22b (more precisely, the inner peripheral surface) of the holding member 20 from being displayed as a double frame. . Further, the variation in luminance at the exposed portion 26a of the transmission screen 26 is suppressed and becomes substantially constant. As a result, the deterioration of the display quality of the head-up display device 2 is suppressed.

In the present embodiment, the head-up display device 2 includes a control unit 12 that generates display light L that is irradiated onto the irradiation area 29 via the projector 10. The irradiation area 29 is formed with an area larger than the exposed portion 26a. Then, the control unit 12 sets a non-drawing area 29o that does not draw a region that overlaps the holding member 20 in the irradiation area 29, and a drawing area that draws a region that overlaps the exposed portion 26a of the transmissive screen 26 in the irradiation area 29. Set to 29i.
According to this configuration, since the irradiation area 29 is formed with a larger area than the exposed portion 26a,
Compared with the case where the irradiation area 29 is formed in the same area as the exposed portion 26 a of the transmission screen 26, the influence on the display quality due to the positional deviation of the irradiation area 29 with respect to the transmission screen 26 can be reduced.

In the present embodiment, the head-up display device 2 is mounted on a vehicle. The head-up display device 2 reflects the display light L from the projector 10 and then reaches the transmissive screen 26, and directs the display light L that has passed through the transmissive screen 26 toward the windshield 3. A concave mirror 61 for reflection.
According to this configuration, the optical path length of the display light L from the projector 10 to the transmissive screen 26 can be increased by providing the optical system 11. Since the display light L from the projector 10 expands as it travels, the size of the irradiation area 29 can be adjusted by adjusting the optical path length with the optical system 11. Accordingly, the provision of the optical system 11 does not increase the linear distance from the projector 10 to the transmissive screen 26, in other words, without increasing the size of the head-up display device 2, the irradiation area 29 is made to pass through the transmissive screen 26. Larger than the exposed portion 26a.

  In the present embodiment, the irradiation area 29 is formed larger than the exposed portion 26a so as to include the exposed portion 26a of the transmission screen 26. However, if the irradiated area 29 is formed so as to include the exposed portion 26a, the exposed portion. It may be formed in the same size as 26a.

  In the present embodiment, the transmission screen 26 is disposed outside the first housing 41 via the holding member 20, but the transmission screen 26 is disposed between the optical system 11 and the plane mirror 51 on the optical path. It may be arranged, for example, it may be arranged inside the first housing 41.

  In the present embodiment, the optical system 11 including a pair of plane mirrors is provided between the projector 10 and the transmission screen 26. However, the number of plane mirrors in the optical system 11 is not limited to this, and a desired optical path length is set. There may be one or more than three to implement. Further, the optical system 11 may be omitted.

  In the present embodiment, the control unit 12 is provided outside the first housing 41, but may be provided inside the first housing 41.

  In the present embodiment, the projection member is the windshield 3, but it may be a dedicated combiner.

  In the present embodiment, the head-up display device 2 is mounted on a vehicle, but may be mounted on a ship, an airplane, or the like other than the vehicle.

  In the present embodiment, the display device is the head-up display device 2, but is not limited thereto, and may be a direct-view display device that directly views the transmission screen 26, for example. In this case, the display device is configured by only the first unit A without the second unit B.

  This embodiment is illustrative, and the present invention is not limited to the above embodiment.

1: Dashboard, 2: Head-up display device, 3: Windshield, 4: Vehicle driver, 10: Projector, 11: Optical system, 12: Control unit, 12a: Memory, 20: Holding member, 21: Base unit 21a: flange part, 21b: tube part, 21c: through hole, 21d: end face, 21e: transmission hole, 21f: recessed part, 21g: fitting hole, 22: frame lid part, 22a: fitting convex part, 22b: Opening, 26, 200: Transmission type screen, 26a, 200a: Exposed part, 29, 100a: Irradiation area, 29a: Outline line, 29i: Drawing area, 29o: Non-drawing area, 41: First housing, 41a, 71a , 300a: opening, 41b: base plate, 41c: cover, 50, 60: reflector, 51: plane mirror, 52, 64: support member, 61: concave mirror, 61a: reflective surface, 6 : Mirror holder, 63: stepping motor, 65: gear part, 66: shaft part, 67: gear, 71: second housing, 71b: light shielding wall, 72: translucent cover, 101, 102: region, 300: holding Frame, A: First unit, B: Second unit, L: Display light, V: Virtual image

Claims (3)

A transmissive screen,
A holding member that has an opening that exposes an exposed portion that is a part of the transmissive screen and holds the transmissive screen from an outer periphery;
A projector that irradiates display light toward the transmissive screen,
The projector irradiates the display light to an irradiation area including the exposed portion of the transmissive screen.
Display device. A control unit that generates the display light that is irradiated onto the irradiation area via the projector;
The irradiation area is formed with an area larger than the exposed portion,
The control unit sets a region that overlaps the holding member in the irradiation area as a non-drawing area that does not draw, and sets a region that overlaps the exposed portion of the transmissive screen as a drawing area in the irradiation area. ,
The display device according to claim 1. The display device is mounted on a vehicle,
Further, an optical system for reflecting the display light from the projector and reaching the transmission screen;
A concave mirror that reflects the display light that has passed through the transmissive screen toward a projection member,
The display device according to claim 1.