JP2005326723A - On-vehicle head-up display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle head-up display which can prevent light rays irregularly reflected inside a liquid crystal panel from being displayed at a display part in the on-vehicle head-up display in which external light rays are made incident on the liquid crystal panel. <P>SOLUTION: A display 10 is in a state where a straight line that is vertical to a surface of an image light ejecting side of the liquid crystal panel is inclined to a ground side and further the straight line that is vertical to the surface of the image light ejecting side of the liquid crystal panel is inclined in a lateral direction toward the straight line. Thus, when the external light rays are entered from an opening 42 of an instrument panel, the external light rays are made incident on the liquid crystal panel of the display 10 via a magnifying mirror 30 and a flat mirror 20 and further is reflected thereby and is guided between the flat mirror 20 and the magnifying mirror 30 and also to the ground side than the flat mirror 20. Thereby light that is irregularly reflected inside the liquid crystal panel can be prevented from being displayed at the head-up display via the flat mirror 20 and the magnifying mirror 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle head-up display.

  2. Description of the Related Art Conventionally, a vehicle head-up display is known as a device that makes a driver recognize information related to a vehicle such as vehicle speed and navigation information.

  A vehicle head-up display includes a display configured by a light source and a transmissive liquid crystal panel (hereinafter referred to as a liquid crystal panel), a plane mirror that reflects image light emitted from the display, and an image reflected by the plane mirror. It has a magnifying glass that guides light to the front windshield, and a display unit for image display provided in the front windshield. These indicators, flat mirrors, and magnifiers are installed in the instrument panel of the vehicle.

  In such an apparatus, the light emitted from the light source is irradiated onto the liquid crystal panel, and an image displayed on the liquid crystal panel is projected as image light. The projected image light is reflected by a plane mirror and a magnifying mirror, is emitted from an opening provided in the upper part of the instrument panel, and forms an image on the inner surface of the front windshield of the vehicle. Specifically, the magnifying glass forms an image of the liquid crystal panel as a virtual image, and forms this virtual image on the inner surface of the front windshield. Thus, the driver can visually recognize the image displayed on the display unit of the front windshield.

  However, in the vehicle head-up display as described above, for example, when sunlight (hereinafter referred to as external light) enters from the opening of the instrument panel, the external light is transmitted to the display device via the magnifying glass and the plane mirror. The light is guided and reflected on the surface of the liquid crystal panel, and is again emitted to the display unit of the front windshield through the plane mirror and the magnifying glass.

  In this way, the external light again emitted to the display portion of the front windshield is reflected on the inner surface of the front windshield and enters the driver's eyes. As a result, the driver visually recognizes the light spot displayed on the display unit of the front windshield, and it becomes difficult to visually recognize the image displayed on the display unit.

  Therefore, a method of preventing external light incident from the opening of the instrument panel from being emitted again from the opening has been conventionally performed. This is done as follows. That is, in the liquid crystal panel, a straight line perpendicular to the image light emission side surface of the liquid crystal panel is tilted so as to fall down in the vertical direction, specifically, the ground side. By tilting the liquid crystal panel in this way, external light reflected on the surface of the liquid crystal panel is guided to the lower part of the plane mirror. In this way, by tilting the liquid crystal panel to the ground side, the external light reflected by the surface of the liquid crystal panel is not returned to the plane mirror again, and is not guided to the display unit of the front windshield through the magnifying glass. .

  However, although the method of tilting the liquid crystal panel as described above is effective for external light reflected on the surface of the liquid crystal panel, the external light that enters the liquid crystal panel reflects irregularly reflected light that is diffusely reflected inside the liquid crystal panel. The inventors have found that there is no effect.

  In view of the above-described points, the present invention provides a vehicle head-up display in which external light is incident on the liquid crystal panel, and the vehicle head-up display that can prevent the light irregularly reflected inside the liquid crystal panel from being displayed on the display unit. For the purpose.

  In order to achieve the above object, the inventors examined diffuse reflection of external light inside the liquid crystal panel.

  As described above, the external light guided from the opening of the instrument panel through the magnifying glass and the plane mirror is reflected by the surface of the tilted liquid crystal panel and guided to the lower part of the plane mirror. However, part of the external light incident on the liquid crystal panel enters the liquid crystal panel. When external light enters the liquid crystal panel in this way, it is diffusely reflected in the liquid crystal panel and is emitted from the liquid crystal panel again, and is displayed on the display unit of the front windshield through the plane mirror and the magnifying mirror. This will be described with reference to FIGS. 4 and 5. FIG.

  4A and 4B are enlarged schematic views of the liquid crystal panel, in which FIG. 4A shows a surface on the image light irradiation side, and FIG. 4B shows a surface facing the light source. As shown in FIG. 4A, on the image light irradiation side surface of the liquid crystal panel, one pixel 53 is divided by wirings 51 and 52 arranged in the horizontal direction on the paper surface and the vertical direction on the paper surface. A thin film transistor (TFT) 54 is arranged in each pixel 53. Further, as shown in FIG. 5B, a mask 55 is provided on the surface facing the light source in the liquid crystal panel so that the light emitted from the light source does not directly hit the wirings 51 and 52 and the TFT 54. It has been.

  When outside light enters the liquid crystal panel as described above, the outside light is diffusely reflected at the respective edges 51 to 66 of the wirings 51 and 52 and the mask 55. The irregularly reflected external light is again irradiated from the liquid crystal panel and guided to the display unit of the front windshield through the plane mirror and the magnifying mirror. At this time, the light irregularly reflected in the liquid crystal panel is displayed on the display unit as a cross band centering on the spot of the external light reflected on the surface of the liquid crystal panel.

  This is shown in FIG. As shown in FIG. 5, the band 71 of light that appears in the lateral direction is irregularly reflected by the edges 62, 64, and 66 extending in the vertical direction of the wiring 52 and the mask 55 shown in FIGS. 4 (a) and 4 (b). Light appears continuously in the horizontal direction with the diameter of the light spot 70. Further, the band of light 72 appearing in the vertical direction is the light spot diffused by the light irregularly reflected by the edges 61, 63, 65 extending in the left-right direction of the wiring 51 and the mask 55 shown in FIGS. 4 (a) and 4 (b). Appears in the vertical direction with a diameter of 70.

  The appearance of the light bands 71 and 72 as described above changes depending on the inclination of the liquid crystal panel installed in the display. This will be described with reference to FIG. FIG. 6 is a diagram showing the reflected light of the surface on the image light irradiation side in the liquid crystal panel. In FIG. 6, each reflected light diagram shown in the vertical direction of the paper corresponds to a case where a straight line perpendicular to the surface of the liquid crystal panel on the image light irradiation side is inclined at each angle in the vertical direction. In FIG. 6, the reflected light diagram shown in the horizontal direction on the paper surface corresponds to the case where a straight line perpendicular to the surface of the liquid crystal panel on the image light irradiation side is inclined at each angle in the left-right direction.

  When the liquid crystal panel is tilted in the vertical direction, the reflected light in the horizontal direction (white portion) can be seen as shown in each reflected light diagram of FIG. That is, when the liquid crystal panel is tilted in the vertical direction as described above, the band 71 of light extending in the horizontal direction is guided to the lower part of the plane mirror together with the light spot 70, but is vertically formed by the irregularly reflected light in the horizontal direction on the liquid crystal panel. The band of light 72 extending in the direction is returned to the plane mirror. That is, even if the liquid crystal panel is tilted in the vertical direction so that the light spot 70 is not displayed on the display unit, the light band 72 extending in the vertical direction due to irregular reflection occurring in the liquid crystal panel is displayed without disappearing. It will be.

  When the liquid crystal panel is tilted in the left-right direction, the light spot 70 escapes to the side of the plane mirror, but the light band 71 extending in the horizontal direction does not disappear, and this light band 71 is displayed on the display unit. .

  In this way, by tilting the liquid crystal panel in the vertical direction or the horizontal direction and letting outside light (that is, the light spot 70) escape to a place other than the mirror surface of the plane mirror, the outside light is diffusely reflected inside the liquid crystal panel. It is possible not to display either one of the light band 72 extending in the vertical direction or the light band 71 extending in the horizontal direction on the display unit, but not to display both simultaneously. I can't do it.

  If the liquid crystal panel is greatly tilted in either the vertical direction or the horizontal direction (for example, 30 °), it is considered that the light bands 71 and 72 extending in the vertical and horizontal directions can be prevented from being displayed. However, although the irregularly reflected light disappears as shown in FIG. 6, since the transmittance of the liquid crystal panel is reduced, the luminance of the image displayed on the display portion of the front windshield is reduced.

  Therefore, in the first aspect of the present invention, the light source (11) is disposed on the back side of the instrument panel of the vehicle, and the liquid crystal panel (14) is disposed at a position facing the light source and displays an image. The display (10) is disposed at a position facing the display, reflects image light emitted from the display, and emits image light from the opening (42) of the instrument panel to the head-up display. And a magnifying glass (30) for displaying an image. In the display device, a straight line perpendicular to the image emission side surface of the liquid crystal panel is inclined in the vertical direction, and the straight line is inclined in the horizontal direction. It is characterized by.

  As a result, when external light enters from the opening of the instrument panel, the external light enters the liquid crystal panel of the display device via the magnifying glass and is reflected and guided to a place other than the magnifying glass. . That is, in the liquid crystal panel, a straight line perpendicular to the image light emission side surface of the liquid crystal panel is tilted in the vertical direction, so that the light band extending in the lateral direction in the cross-shaped light band is guided to the upper or lower part of the magnifying glass. be able to. In addition, in the liquid crystal panel, by tilting a straight line perpendicular to the surface on the image light emission side of the liquid crystal panel in the horizontal direction, the light band extending in the vertical direction in the cross-shaped light band can be changed to the right side or left side of the magnifying glass. Can lead to.

  Thus, by tilting the image light emission side surface of the liquid crystal panel not only in the vertical direction but also in the horizontal direction, the light irregularly reflected inside the liquid crystal panel can be guided to a place other than the magnifier. Therefore, it is possible to prevent the light irregularly reflected inside the liquid crystal panel from being displayed on the head-up display.

  In the invention according to claim 2, the vehicle has a light source (11) disposed on the back side of the instrument panel of the vehicle, and a liquid crystal panel (14) disposed at a position facing the light source to display an image. And a display (10) arranged to emit image light of an image displayed on the liquid crystal panel in a direction perpendicular to the traveling direction of the display, and disposed at a position facing the display and emitted from the display A plane mirror (20) that reflects the image light that is reflected on the front side of the vehicle with respect to the plane mirror and the reflecting surface is directed toward the rear side of the vehicle, reflects the image light that is guided from the plane mirror, and includes an instrument panel A magnifying glass (30) that emits image light from the opening (42) and displays an image on a head-up display, and in the display, a straight line perpendicular to the image light emission side surface of the liquid crystal panel is in the vertical direction Together are tilted, it is characterized in that the straight line is inclined to the horizontal direction.

  Thus, when external light enters from the opening of the instrument panel, the external light enters the liquid crystal panel of the display device via the magnifying mirror and the plane mirror and is reflected and guided to a place other than the plane mirror. Therefore, as in the first aspect, by tilting the liquid crystal panel, a cross-shaped band of light generated by externally reflecting external light inside the liquid crystal panel can be guided to a place other than the plane mirror. Therefore, it is possible to prevent the light irregularly reflected inside the liquid crystal panel from being displayed on the head-up display.

  According to a third aspect of the present invention, in the liquid crystal panel, a straight line perpendicular to the surface on the image light emission side of the liquid crystal panel is inclined toward the vehicle front side.

  By tilting the liquid crystal panel in this way, the light irregularly reflected in the liquid crystal panel can be guided between the magnifying mirror and the plane mirror.

  According to a fourth aspect of the invention, the liquid crystal panel is tilted to the front side of the vehicle in a range of 15 ° to 17 °.

  The liquid crystal panel can be tilted to the vehicle front side within the above range. The lower limit value is a limit value at which light irregularly reflected in the liquid crystal panel is not returned to the plane mirror. The upper limit value is a limit value that ensures the luminance of the image light emitted from the liquid crystal panel. Therefore, the irregular reflection of the liquid crystal panel is guided between the plane mirror and the magnifying mirror, and the transmittance of the liquid crystal panel can be secured.

  According to a fifth aspect of the present invention, in the display device, a straight line perpendicular to the image light emitting side surface of the liquid crystal panel is inclined to the ground side.

  By tilting the liquid crystal panel in this way, the light irregularly reflected in the liquid crystal panel can be guided to the ground side from the plane mirror.

  The invention according to claim 6 is characterized in that the liquid crystal panel is tilted in the range of 8 ° to 12 ° to the ground side.

  Thus, the liquid crystal panel can be tilted to the ground side within the above range. The lower limit value is a limit value at which the light irregularly reflected in the liquid crystal panel is not returned to the incident mirror. The upper limit value is a limit value that ensures the luminance of image light emitted from the liquid crystal panel, that is, the transmittance of the liquid crystal panel. Therefore, the transmittance of the liquid crystal panel can be secured without returning the irregular reflection of the liquid crystal panel to the plane mirror.

  The invention described in claim 7 includes a display (10) having a light source (11) and a liquid crystal panel (14) arranged at a position facing the light source to display an image, and is emitted from the display. In the vehicle head-up display in which image light is displayed on the display unit (40) of the head-up display, a plurality of edges extending in an arbitrary direction among element patterns formed inside the liquid crystal panel in the liquid crystal panel. When a vertical straight line is defined as a first straight line and a straight line perpendicular to a plurality of edges extending in a direction parallel to the first straight line is defined as a second straight line, external light is incident on the liquid crystal panel of the display via the display unit. In this case, the liquid crystal panel is arranged such that the optical axis of the external light and the first straight line intersect at an angle different from the right angle, and the optical axis of the external light and the second straight line intersect at an angle different from the right angle. Tilted It is characterized in that.

  Thus, the first straight line and the second straight line intersect at an angle different from the right angle with respect to the optical axis of the external light incident on the liquid crystal panel. Accordingly, it is possible to prevent external light incident on the liquid crystal panel from returning to the display unit along the incident optical path.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a vehicle head-up display according to an embodiment of the present invention. As shown in FIG. 1, the vehicle head-up display includes a display 10 that emits image light, a plane mirror 20 that reflects image light emitted from the display 10, and image light reflected by the plane mirror 20. A magnifying glass 30 that is enlarged and led to the front windshield 41 and a display unit 40 for displaying image light guided from the magnifying glass 30 are provided.

  The display 10 outputs image light of content displayed on the display unit 40 of the front windshield 41, and a specific configuration is shown in FIG. FIG. 2 is a configuration diagram of the display unit 10 of the vehicle head-up display shown in FIG. As shown in FIG. 2, the display unit 10 includes a light source 11, a case 12, a rubber spacer 13, a liquid crystal panel 14, and an opening lid 15.

  The light source 11 includes an LED 11a, a first projection lens 11b, a diffusion plate 11c, a spacer 11d, and a second projection lens 11e.

  The LED 11a is a well-known device that emits light, and functions as a backlight of the liquid crystal panel 14 described later. In the present embodiment, three LEDs 11a are attached to the plate member 11f as point light sources. The first projection lens 11b condenses and projects the light emitted from the LED 11a. The diffusion plate 11c diffuses the light projected from the first projection lens 11b, and the spacer 11d accommodates the first projection lens 11b and the diffusion plate 11c.

  The second projection lens 11e collects the light diffused by the diffusion plate 11c again and projects it into the case 12, and is constituted by a curved projection surface. With such a projection surface, the second projection lens 11e serves as a surface light source.

  In the light source 11 having the above configuration, the first projection lens 11b and the diffusing plate 11c are accommodated in the spacer 11d, and the spacer 11d is sandwiched between the plate member 11f to which the LED 11a is attached and the second projection lens 11e. It is united.

  In the light source 11 having such a configuration, when light is emitted from the LED 11a, the light is collected by the first projection lens 11b, once diffused by the diffusion plate 11c, and again the second projection lens. The light is condensed and emitted at 11e.

  The case 12 forms the outer shape of the box-shaped display 10. The case 12 houses the light source 11, the rubber spacer 13, and the liquid crystal panel 14, and constitutes the display unit 10 by forming a package with the opening lid 15. It is a storage member. The case 12 is provided with an opening for housing the light source 11, the rubber spacer 13, and the liquid crystal panel 14 on one side and a surface facing the one side.

  The rubber spacer 13 plays a role of holding the liquid crystal panel 14 and is for tilting the liquid crystal panel 14 and storing it in the case 12. In the present embodiment, the rubber spacer 13 is made of, for example, silicon rubber, and also serves as a buffer member that sandwiches and holds the liquid crystal panel 14 formed of a glass member.

  In the liquid crystal panel 14, liquid crystal is injected between two glass plates to form element patterns, that is, dots (pixels) sectioned by wiring, and each pixel is controlled by a thin film transistor (TFT) to display an image. This is a known image display device. The liquid crystal panel 14 is held by the outer edge portion being sandwiched between grooves (not shown) provided in the rubber spacer 13. The liquid crystal panel 14 is electrically connected to an external ECU or the like, and an image signal is input from the external ECU or the like and the image is displayed.

  The present embodiment is characterized in that the liquid crystal panel 14 is tilted and installed in the case 12. The tilting of the liquid crystal panel 14 will be described in detail later.

  The opening lid portion 15 is a lid member that forms an outer shape of the display 10 by being integrated with the case 12. The opening lid 15 sandwiches and fixes the rubber spacer 13 and the liquid crystal panel 14 housed on the side facing the one side of the case 12 in the case 12. Further, the opening lid portion 15 is provided with an opening portion 15 a through which image light displayed on the liquid crystal panel 14 is output from the display device 10.

  In the display device 10 having the above-described configuration, the light source 11 is disposed on one side surface of the case 12, and the rubber spacer 13 and the liquid crystal panel are disposed on the surface side facing the one side surface of the case 12, that is, the position facing the light source 11. 14 is arranged. The display unit 10 is configured by pressing the rubber spacer 13 and the liquid crystal panel 14 against the case 12 and attaching the opening lid 15 to the case 12.

  As shown in FIG. 1, the display device 10 configured in this way is arranged in the instrument panel so that image light is emitted from the right side to the left side with respect to the traveling direction of the vehicle.

  When light is emitted from the light source 11 and an image signal is input to the liquid crystal panel 14 from an external ECU or the like, the image light is emitted from the liquid crystal panel 14, and the image light is emitted from the opening portion of the opening lid portion 15. Injected from 15a.

  The plane mirror 20 is a mirror that is disposed at a position facing the opening lid portion 15 of the display 10 and reflects image light emitted from the display 10 to the magnifying glass 30. The angle of the plane mirror 20 is fixed, and the image light from the display 10 is always guided to the magnifying mirror 30.

  The magnifying mirror 30 reflects the image light guided from the plane mirror 20, emits the image light from an opening 42 provided in the upper part of the instrument panel, and guides it to the front windshield 41. Such a magnifying glass 30 has a reflecting surface directed toward the rear side of the vehicle.

  A side of the magnifying glass 30 is provided with a gear (not shown) and a motor for driving the gear. When a signal is input from an operation panel (not shown), the angle of the magnifying glass 30 is changed. Thus, the size of the image displayed on the display unit 40 of the front windshield 41 is adjusted so that it can be easily seen by the driver.

  The display unit 40 is an image display area provided on the inner surface of the front windshield 41 that forms an image of the image light guided from the magnifying glass 30 and displays it as an image.

  The above is the configuration of the vehicle head-up display. In this vehicle head-up display, the display 10, the plane mirror 20, and the magnifying glass 30 are housed in a housing (not shown), and this housing is arranged inside the instrument panel.

  In the vehicle head-up display having such a configuration, when light is emitted from the light source 11, the light is irradiated onto the liquid crystal panel 14, and image light of an image displayed on the liquid crystal panel 14 is projected from the display 10. The projected image light is emitted from the opening 42 provided in the upper part of the instrument panel via the plane mirror 20 and the magnifying mirror 30 and is imaged on the inner surface of the front windshield 41. Specifically, the magnifying glass 30 forms an image of the liquid crystal panel 14 as a virtual image, and forms this virtual image on the inner surface of the front windshield 41. As a result, the driver can visually recognize the image displayed on the display unit 40 of the front windshield 41.

  Although not limited, the display unit 40 of the front windshield 41 includes, for example, vehicle information such as vehicle speed and navigation (arrows, shape of intersection, distance to intersection), and vehicles photographed with an infrared camera at night. The front image is displayed.

  Next, the installation angle of the liquid crystal panel 14 in the case 12 of the display device 10 will be described in detail. First, when external light enters from the opening 42 of the instrument panel, the external light enters the liquid crystal panel 14 of the display 10 via the magnifying mirror 30 and the plane mirror 20. And the external light which injected into the inside of the liquid crystal panel 14 is irregularly reflected by each edge 61-66 of the wiring 51 and 52 in the liquid crystal panel 14 and the mask 55 which are shown by FIG. When the irregularly reflected light is emitted from the display 10, it is emitted again from the opening 42 of the instrument panel via the plane mirror 20 and the magnifying mirror 30. That is, as described above, the display unit 42 of the front windshield 41 has a vertical light band 72 and a vertical light band that are formed by continuous irregular reflection in the liquid crystal panel 14 as shown in FIG. A horizontal light band 71 formed by a series of irregular reflections is displayed as a cross shape with the light spot 70 as the center.

  In the present embodiment, the liquid crystal panel 14 is inclined such that a straight line perpendicular to the surface of the liquid crystal panel 14 on the image light irradiation side is a top-and-bottom direction, specifically the ground side. In the following, the direction in which the liquid crystal panel 14 is tilted in this way is referred to as the vertical direction. Specifically, the liquid crystal panel 14 is tilted in the range of 8 ° to 12 ° in the vertical direction, more preferably 10 °.

  The reason why the angle at which the liquid crystal panel 14 is tilted in the vertical direction is set to 8 ° because the external light reflected by the liquid crystal panel 14 cannot be guided to the lower part of the plane mirror 20 unless it is tilted at least 8 ° in the vertical direction. It is. On the other hand, the upper limit of the angle at which the liquid crystal panel 14 is tilted in the vertical direction is set to 12 ° in order to ensure the transmittance of the liquid crystal panel 14. That is, when the vertical angle is larger than 12 °, the transmittance of light from the light source 11 that passes through the liquid crystal panel 14 decreases, and the luminance of the image displayed on the display unit 40 of the front windshield 41 is reduced. End up. In order to prevent this, the upper limit of the angle of tilting in the vertical direction is set to 12 °.

  In the present embodiment, the lower limit of the angle at which the liquid crystal panel 14 is tilted in the vertical direction is 8 °, and the upper limit is 12 °. These angles are determined by the display 10 and the plane mirror disposed in the instrument panel. 20 and the size of the display 10 and the plane mirror 20. Therefore, the lower limit and the upper limit of the angle at which the liquid crystal panel 14 is tilted in the vertical direction are changed as the interval and size are changed. In other words, depending on the distance between the display 10 and the plane mirror 20 and the size of the display 10 and the plane mirror 20, the lower limit of the angle at which the liquid crystal panel 14 is tilted in the vertical direction may be 8 ° or less, and the upper limit may be 12 ° or more. Absent.

  In the present embodiment, the liquid crystal panel 14 is tilted in the vertical direction, and a straight line perpendicular to the image light irradiation side surface of the liquid crystal panel 14 is tilted in the horizontal direction, specifically the vehicle front side. Hereinafter, the direction in which the liquid crystal panel 14 is tilted in this way is referred to as the left-right direction. Specifically, the liquid crystal panel 14 is tilted in the range of 15 ° to 17 °, more preferably 15 ° in the left-right direction.

  The lower limit of the angle at which the liquid crystal panel 14 is tilted in the left-right direction is set to 15 °. The external light reflected by the liquid crystal panel 14 cannot be guided to the side of the plane mirror 20 unless it is tilted at least 8 ° in the left-right direction. Because. On the other hand, the reason why the upper limit of the tilt angle of the liquid crystal panel 14 is set to 17 ° is the same as the reason for the upper limit value of the tilt of the liquid crystal panel 14 in the vertical direction.

  In the present embodiment, the lower limit of the angle at which the liquid crystal panel 14 is tilted in the left-right direction is 15 °, and the upper limit is 17 °. However, these angles are not limited to the above values as described above. . That is, the lower limit and the upper limit of the angle at which the liquid crystal panel 14 is tilted in the left-right direction are not limited to the above-described values, and may be changed depending on the interval and size of the display 10 and the plane mirror 20.

  In order to tilt the liquid crystal panel 14 as described above, the rubber spacer 13 is used in the present embodiment. That is, when the liquid crystal panel 14 is stored in the case 12, a groove for tilting and holding the liquid crystal panel 14 is formed in the rubber spacer 13, and an outer edge portion of the liquid crystal panel 14 is inserted into the groove, thereby liquid crystal The panel 14 can be tilted and held.

  And the rubber spacer 13 becomes the structure by which the thickness of the outer edge part was changed. That is, by changing the thickness of the outer edge portion, when the liquid crystal panel 14 is held, the liquid crystal panel 14 can be held at a desired angle.

  By tilting the liquid crystal panel 14 in the vertical direction and the horizontal direction in this manner, the light bands 71 and 72 can be prevented from being displayed on the display unit 40 of the front windshield 41. This will be described with reference to FIG. 3A and 3B are diagrams illustrating a path of external light incident on the display device 10, where FIG. 3A is a view of the vehicle head-up display viewed from the rear side of the vehicle, and FIG. It is the figure seen from the side.

  First, by tilting the liquid crystal panel 14 in the vertical direction, the light irregularly reflected by the liquid crystal panel 14 is guided to the lower part of the plane mirror 20 as shown in FIG. That is, in the liquid crystal panel 14, a band 71 of light extending in the lateral direction as shown in FIG. 5 can be guided to the lower part of the plane mirror 20.

  Further, by tilting the liquid crystal panel 14 in the left-right direction, the light irregularly reflected by the liquid crystal panel is guided between the plane mirror 20 and the magnifying mirror 30 as shown in FIG. That is, in the liquid crystal panel 14, a light band 72 extending in the vertical direction as shown in FIG. 5 can be guided between the plane mirror 20 and the magnifying mirror 30.

  Thus, by tilting the liquid crystal panel 14 in the vertical direction and the horizontal direction, the bands 71 and 72 of light caused by the irregular diffused light in the vertical direction and the diffused light in the lateral direction inside the liquid crystal panel 14 are not returned to the plane mirror 20, respectively. ing.

  As described above, in the vehicle head-up display of this embodiment, the liquid crystal panel 14 is tilted in the vertical direction and the horizontal direction. That is, it is possible to guide the cross-shaped light bands 71 and 72 generated by the irregular reflection of external light inside the liquid crystal panel 14 to a place other than the plane mirror 20. That is, in the liquid crystal panel 14, a straight line perpendicular to the image light emission side surface of the liquid crystal panel 14 is inclined to the ground side, whereby the light band 71 extending in the lateral direction in the cross-shaped light bands 71 and 72 is changed to the plane mirror 20. Can be led to the bottom of the. In addition, in the liquid crystal panel 14, a straight line perpendicular to the image light emission side surface of the liquid crystal panel 14 is tilted forward of the vehicle, so that the light band 72 extending in the vertical direction in the cross-shaped light bands 71 and 72 is a plane mirror. 20 and the magnifying glass 30 can be guided. Therefore, it is possible to prevent the light irregularly reflected inside the liquid crystal panel 14 from being displayed on the display unit 40 of the front windshield 41.

  The angle at which the liquid crystal panel 14 is tilted can be 10 ° in the vertical direction and 15 ° in the horizontal direction as in this embodiment. By setting the angle at which the liquid crystal panel 14 is tilted to such a value, the transmittance of the liquid crystal panel 14 can be ensured, and the light irregularly reflected inside the liquid crystal panel 14 of the display device 10 can be reliably transmitted to a place other than the plane mirror 20. Can lead.

  In the present embodiment, the liquid crystal panel 14 is inclined in the left-right direction, that is, the vehicle front side. Thereby, the light irregularly reflected inside the liquid crystal panel 14 can be reliably guided between the plane mirror 10 and the magnifying mirror 30, which are places other than the plane mirror 20.

(Other embodiments)
In the first embodiment, the liquid crystal panel 14 is housed in the case 12 via the rubber spacer 13 that tilts the liquid crystal panel 14, but the rubber spacer 13 having a certain thickness is replaced with the case. 12 may be tilted. Further, if the liquid crystal panel 14 can be tilted in the case 12, the display 10 can be configured not to use the rubber spacer 13. Furthermore, the case 12 itself containing the liquid crystal panel 14 can be installed in the instrument panel at a desired angle.

  Further, the material for fixing the angle of the liquid crystal panel 14 is not limited to the rubber spacer 13, and any material other than rubber may be used as long as the material has rubber elasticity.

  In the first embodiment, the light source 11 is composed of a plurality of components, but the light source 11 may be composed of other components.

  In the first embodiment, the image light emitted from the display device 10 is guided to the magnifying mirror 30 via the plane mirror 20. However, the plane mirror 20 may be omitted. That is, you may make it irradiate the image light inject | emitted from the indicator 10 to the magnifier 30 directly. In such a case, the liquid crystal panel 14 is tilted so that the external light reflected by the liquid crystal panel 14 is guided to a place other than the magnifier 30.

  Moreover, in the said 1st Embodiment, although the image light inject | emitted from the indicator 10 is left side from the right side with respect to the vehicle advancing direction, you may make it inject | emit from the left side to the right side. In this case, in the liquid crystal panel 14, a straight line perpendicular to the surface on the image light irradiation side of the liquid crystal panel 14 is inclined to the vehicle front side as in the first embodiment. Thereby, the external light reflected by the liquid crystal panel 14 can be guided between the plane mirror 20 and the magnifying mirror 30.

  In the first embodiment, the liquid crystal panel 14 is tilted so that a straight line perpendicular to the image light irradiation side surface of the liquid crystal panel 14 falls to the ground side, but tilts not to the ground side but to the ceiling side. Anyway. Thereby, the irregularly reflected light emitted from the liquid crystal panel 14 is guided to the upper part of the plane mirror 20.

  In the first embodiment, the display 10 and the plane mirror 20 are arranged at the same height, and in this arrangement, the liquid crystal panel 14 inside the display 10 is tilted vertically and horizontally. Yes. However, according to the present invention, the external light irregularly reflected inside the liquid crystal panel 14 of the display 10 is prevented from returning to the display unit 40 of the front windshield 41 regardless of the positional relationship between the display 10 and the flat mirror 20. it can.

  This can be realized by tilting the liquid crystal panel 14 with respect to the optical axis of external light incident on the liquid crystal panel 14 as follows. That is, in the liquid crystal panel 14, a straight line perpendicular to a plurality of edges 61 and 63 extending in an arbitrary direction among element patterns (wirings 51 and 52, mask 55) formed in the liquid crystal panel 14 is defined as a first straight line. A straight line perpendicular to the plurality of edges 62, 64, 66 extending in a direction parallel to the first straight line is defined as a second straight line. When external light enters the liquid crystal panel 14 of the display 10 via the display unit 40, the optical axis of the external light and the first straight line intersect at an angle different from the right angle, and the optical axis of the external light The liquid crystal panel 14 is tilted so that the second straight line and the second straight line intersect at an angle different from the right angle. Thereby, regardless of the positional relationship between the display 10 and the plane mirror 20, for example, the height of the display 10 or the plane mirror 20, external light does not return to the display unit 40 along the optical path incident on the liquid crystal panel 14. Can do.

1 is a schematic configuration diagram of a vehicle head-up display according to an embodiment of the present invention. It is a detailed block diagram of the display shown in FIG. It is the figure which showed the path | route of the external light which injects into the indicator shown in FIG. 1, (a) is the figure which looked at the vehicle head-up display from the vehicle rear side, (b) is the vehicle head-up display on the ceiling side. It is the figure seen from. It is the schematic of a liquid crystal panel, (a) is the figure which showed the surface by the side of image light irradiation, (b) is the figure which showed the surface by the side of a light source. It is the figure which showed a mode that the light diffusely reflected inside the liquid crystal panel is displayed on the display part of a front windshield. It is the figure which showed the mode of the irregular reflection in a liquid crystal panel when a liquid crystal panel is tilted to the up-down direction or the left-right direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Display device, 11 ... Light source, 14 ... Liquid crystal panel, 20 ... Plane mirror, 30 ... Magnifying glass,
40 ... display section, 42 ... opening.

Claims (7)

A display (10) that is disposed on the back side of the instrument panel of the vehicle and includes a light source (11) and a liquid crystal panel (14) that is disposed at a position facing the light source and displays an image;
It is disposed at a position facing the display, reflects image light emitted from the display, and emits the image light from the opening (42) of the instrument panel to display an image on a head-up display. A magnifying glass (30),
In the display device, the straight line perpendicular to the image emission side surface of the liquid crystal panel is inclined in the vertical direction, and the straight line is inclined in the horizontal direction. A light source (11) disposed on the back side of an instrument panel of a vehicle, and a liquid crystal panel (14) disposed at a position facing the light source to display an image, and perpendicular to the traveling direction of the vehicle A display (10) arranged to emit image light of an image displayed on the liquid crystal panel in a different direction;
A plane mirror (20) disposed at a position facing the display and reflecting the image light emitted from the display;
It is arranged on the vehicle front side with respect to the plane mirror and has a reflection surface directed toward the vehicle rear side, reflects the image light guided from the plane mirror, and from the opening (42) of the instrument panel. A magnifying glass (30) that emits image light and displays an image on a head-up display,
The vehicle head-up display characterized in that, in the display device, a straight line perpendicular to the image light emitting side surface of the liquid crystal panel is inclined in the vertical direction, and the straight line is inclined in the horizontal direction. 3. The vehicle head-up display according to claim 2, wherein in the liquid crystal panel, a straight line perpendicular to the surface of the liquid crystal panel on the image light emission side is inclined toward the front side of the vehicle. 4. The vehicle head-up display according to claim 3, wherein the liquid crystal panel is tilted in a range of 15 ° to 17 ° toward the vehicle front side. 5. The vehicle according to claim 1, wherein a straight line perpendicular to an image light emission side surface of the liquid crystal panel is inclined to the ground side in the display. Head-up display. The vehicle head-up display according to claim 5, wherein the liquid crystal panel is tilted to the ground side within a range of 8 ° to 12 °. A display (10) having a light source (11) and a liquid crystal panel (14) arranged at a position facing the light source to display an image, and image light emitted from the display is a head-up display. In the vehicle head-up display in which an image is displayed on the display unit (40),
Inside the liquid crystal panel, a straight line perpendicular to a plurality of edges extending in an arbitrary direction among element patterns formed inside the liquid crystal panel is defined as a first straight line, and a plurality of lines extending in a direction parallel to the first straight line If the straight line perpendicular to the edge is the second straight line,
When external light is incident on the liquid crystal panel of the display unit via the display unit, the optical axis of the external light and the first straight line intersect at an angle different from a right angle, and the light of the external light The head-up display for a vehicle, wherein the liquid crystal panel is inclined so that an axis and the second straight line intersect at an angle different from a right angle.

Images