JP2010282108A - Head-up display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head-up display device for a vehicle, reducing distortion of a contour line in a display image. <P>SOLUTION: The head-up display device for the vehicle is equipped with: a display element 23 emitting display light L; a case body 24 having an aperture 24a through which the display light L passes and a base part 24b which surrounds the aperture 24a; and a reflection member 31 reflecting the display light L passing through the aperture 24a, wherein a projection member 13 having predetermined curvature is irradiated with the display light L reflected by the reflection member 31, thereby making a user 14 of the vehicle view the display image V obtained by such irradiation. An upper aperture edge part R1 and a lower aperture edge part R2 in a boundary portion between the aperture 24a and the base part 24b are formed into curved shape. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention irradiates display light emitted from a display (display element) onto a projection member such as a windshield of a vehicle, and makes a vehicle user visually recognize a display image obtained by the irradiation. It is about.

  Conventionally, in this type of head-up display device for a vehicle, as described in, for example, Patent Document 1 below, a display image from a display is projected (irradiated) onto a windshield (projection member) of a vehicle, thereby forming a virtual image. What displays (display image) is known.

JP 2008-224791 A

  The vehicle head-up display device described in Patent Document 1 is mounted inside an instrument panel (hereinafter referred to as an instrument panel) of a vehicle, and displays a display that emits display light and display light emitted from the display. A concave mirror (reflecting member) for reflecting and a housing for housing the indicator and the concave mirror are provided, and the display light reflected by the concave mirror is projected onto a projection member (front glass) having a predetermined curvature through an emitting portion formed in the housing. (Irradiation), and the display image obtained by this irradiation is visually recognized by the vehicle user (driver).

  In this case, the display device includes a light source composed of a light emitting diode mounted on a circuit board, and a liquid crystal display element positioned on the front side of the light source so as to transmit illumination light from the light source to form display light. (Display element) and a case body made of a synthetic resin that accommodates the circuit board, the light source, and the liquid crystal display element.

  In addition, the case body includes an opening made of a rectangular opening window for facing the display area of the liquid crystal display element, a front wall (base) formed in a frame shape so as to surround the opening, a circuit, In this case, the bottom wall portion is disposed along the back side of the substrate, and the side wall portion is disposed between the front wall portion and the bottom wall portion so as to surround the light source and the liquid crystal display element. The size of the opening is slightly smaller than the size of the display area. The display light emitted from the liquid crystal display element is guided to the concave mirror side through the opening.

  Incidentally, FIG. 6 shows a front view of the display device 100 when viewed from the concave mirror side. In FIG. 6, reference numeral 110 denotes a liquid crystal display element, and 120 denotes a case body. The case body 120 includes a rectangular opening 121 formed slightly smaller than the display area 111 of the liquid crystal display element 110, and an opening. It is mainly composed of a front wall part (base part) 122 formed in a frame shape so as to surround the part 121, and is positioned vertically and horizontally in the front wall part 122 which is a boundary part between the opening part 121 and the front wall part 122. The four inner wall surfaces P to be formed are straight horizontal inner wall surfaces each having a linear shape.

  In the case of the vehicle head-up display device described above, the display light emitted from the liquid crystal display element is applied to the windshield of the vehicle as a projection member through the concave mirror, and the driver visually recognizes the display image obtained by this irradiation. It has a possible configuration.

  Here, when attention is paid to the liquid crystal display element 110 and the case body 120 shown in FIG. 6, when the display light emitted from the liquid crystal display element 110 (display area 111) passes through the opening 121, the size of the opening 121. The display effective area surrounded by the four inner wall surfaces P of the front wall portion 122 is a vehicle windshield through a concave mirror, because the size is slightly smaller than the size of the display area 111. When the driver visually recognizes the display image, contour lines corresponding to the four inner wall surfaces P are formed around the display image.

However, since the driver side surface of the windshield of the vehicle has a predetermined curvature at this time, the driver (vehicle user) visually recognizes in front of the windshield F as shown in FIG. Among the four contour lines Y forming the contour of the display image X, there is a problem that distortion occurs in the upper contour line Y1 and the lower contour line Y2 located above and below the display image X in FIG. There was room for further improvement in this regard.
Accordingly, an object of the present invention is to provide a vehicle head-up display device capable of reducing distortion of a contour line in a display image in order to cope with the above-described problems.

  The present invention includes a display element that emits display light, a case body having an opening through which the display light passes and a base that surrounds the opening, and a reflecting member that reflects the display light that passes through the opening. A vehicle head-up display device that irradiates a projection member having a predetermined curvature with the display light reflected by the reflecting member and makes a vehicle user visually recognize a display image obtained by the irradiation. The required part in the boundary part between the part and the base part has a curved shape.

  ADVANTAGE OF THE INVENTION According to this invention, the initial objective can be achieved and the head-up display apparatus for vehicles which can make distortion of the outline in a display image small can be provided.

1 is a schematic view of a head-up display device according to an embodiment of the present invention. Sectional drawing of the display apparatus by the embodiment. Sectional drawing of the indicator by the embodiment. The front view of the indicator when it sees from the reflective member side by the embodiment. The front view of the projection member by the embodiment. The front view of the indicator when it sees from the reflective member side by a prior art. The front view of the projection member by a prior art.

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

  As shown in FIG. 1, the vehicle head-up display device uses the windshield 13 of the vehicle 10, which is a projection member, to display light L projected by the display device 12 that is a display unit disposed inside the instrument panel 11 of the vehicle 10. The virtual image V is displayed by reflecting in the direction of the driver (user) 14 of the vehicle 10. In other words, the head-up display device for a vehicle irradiates (projects) the display light L emitted from a display device (described later) of the display device 12 onto the windshield 13 (the projection member) having a predetermined curvature. The obtained virtual image (display image) V is visually recognized by the driver 14. Thus, the driver 14 can observe the virtual image V displayed in front of the driver's seat in a superimposed manner with the scenery.

  As shown in FIG. 2, the display device 12 mainly includes a display device 20, a reflector 30, and a housing 40.

  As shown in detail in FIG. 3, the display 20 includes a circuit board 21, a light source 22 mounted on the circuit board 21, and illumination light from the light source 22 to transmit the illumination light to form display light L. A liquid crystal display element (display element) 23 positioned on the front side, a circuit board 21, a light source 22, and a case body 24 that houses the liquid crystal display element 23 are provided.

  The circuit board 21 is made of, for example, a wiring board provided with a predetermined wiring pattern, and a light source 22 is mounted on the wiring pattern.

  The light source 22 is, for example, a chip-type light emitting diode, and is a light emitter that supplies illumination light to the liquid crystal display element 23.

  The liquid crystal display element 23 is composed of, for example, a TFT (thin film transistor) type liquid crystal display panel in which a polarizing film is provided on the front and back surfaces of a liquid crystal cell in which liquid crystal is sealed in a pair of translucent substrates. The liquid crystal display element 23 includes an arithmetic circuit (not shown) for measuring the vehicle speed and the engine speed based on output signals from a vehicle speed sensor and an engine rotation sensor provided in the vehicle 10, and the liquid crystal based on the calculation result. A measured value of the speed of the vehicle 10 or the engine speed can be displayed as a numerical value by a driving element drive circuit (not shown).

  The display information displayed by the liquid crystal display element 23 is not limited to the vehicle speed and the engine speed, and may be travel distance information, navigation information, and outside air temperature information, for example.

  The case body 24 is made of a synthetic resin and is formed in a substantially box shape. The case body 24 has an opening 24a for facing a display area to be described later of the liquid crystal display element 23 and a substantially frame shape so as to surround the opening 24a. A base portion 24b as a front wall portion to be formed, a substantially flat bottom wall portion 24c arranged along the back side of the circuit board 21, and a base portion 24b so as to surround the light source 22 and the liquid crystal display element 23. A side wall portion 24d positioned between the peripheral edge and the peripheral edge of the bottom wall portion 24c. In this case, the inner wall portion of the base portion 24b is tapered toward the center of the liquid crystal display element 23 (hereinafter referred to as a tapered portion). I am doing. The display light L emitted from the liquid crystal display element 23 is guided to the reflector 30 through the opening 24a.

  Here, FIG. 4 shows a front view of the indicator 20 when viewed from the direction of arrow A (the concave mirror side described later) in FIG. 3, and in the following description, in the base 24b, in FIG. The boundary between the upper opening 24a and the base 24b is defined as an upper opening edge R1, and in FIG. 4, the boundary between the lower opening 24a and the base 24b is defined as a lower opening edge R2. 4, the boundary portion between the opening portion 24a and the base portion 24b on the left side is defined as the left opening edge portion R3. In FIG. 4, the boundary portion between the opening portion 24a and the base portion 24b on the right side is defined as the right opening edge. Part R4 is defined. 4 indicates the display area 23a of the liquid crystal display element 23. The size of the display area 23a is slightly larger than the size of the opening 24a.

  And in this example, among upper side opening edge R1, lower side opening edge R2, left side opening edge R3, and right side opening edge R4 mentioned above, upper side opening edge R1 and lower side opening edge R2 are cases. The shape of the body 24 when viewed from the front is a curved shape that curves upward as shown in FIG. 4, and corresponds to the edge portion of the tapered portion in the cross-sectional shape in the thickness direction of the base 24b in FIG. Do it.

  On the other hand, the shape of the left opening edge R3 and the right opening edge R4 when viewed from the front side of the case body 24 is not a curved shape but a straight shape as shown in FIG. Although not shown in the figure, it corresponds to the edge portion of the tapered portion, like the upper opening edge R1 and the lower opening edge R2.

  The reflector 30 includes a concave mirror (reflecting member) 31 that reflects the display light L that passes through the opening 24a, and a mirror holder 32 made of a synthetic resin that holds the concave mirror 31.

  The concave mirror 31 is formed by depositing a reflective layer 31a on a resin substrate made of polycarbonate having a concave surface. The concave mirror 31 is disposed in an inclined state at a position where the reflective layer 31a faces a liquid crystal display element 23 and a translucent cover (to be described later) of the housing 40 and faces the translucent cover.

  The concave mirror 31 reflects (projects) the display light L from the display device 20 toward the translucent cover (the windshield 13 of the vehicle 10). This means that the concave mirror 31 enlarges the display light L emitted from the display device 20 and projects (irradiates) the enlarged display light L onto the windshield 13 through the translucent cover. . The concave mirror 31 is bonded to the mirror holder 32 with a double-sided adhesive tape.

  The housing 40 is made of, for example, a black light-shielding synthetic resin material, and is formed in a substantially box shape. The housing 40 holds the display device 20 and the reflector 30 in the space portion 41 that is an internal space of the housing 40. An opening window portion 42 is provided in which an upper portion (front glass 13 side) of the arrangement position of the concave mirror 31 in the container 30 is opened.

  Further, the housing 40 is provided with a translucent cover 43 that is an emission part so as to close the opening window 42. The translucent cover 43 is made of a translucent synthetic resin material (for example, acrylic resin), is formed in a curved shape (curved surface shape), and transmits light that transmits (passes) the display light L reflected by the concave mirror 31. It has a function as a sex member. That is, after passing through the opening 24a, the display light L reflected by the concave mirror 31 is applied to the windshield 13 having a predetermined curvature through the translucent cover 43 formed in the housing 40, and is obtained by this irradiation. The driver 14 visually recognizes the virtual image V.

  Here, when the display light L passes through the opening 24a, the size of the opening 24a is slightly smaller than the size of the display area 23a. When the display effective area surrounded by the side opening edge R2, the left side opening edge R3, and the right side opening edge R4 is projected on the windshield 13 through the concave mirror 31, and the driver 14 visually recognizes the virtual image V, the virtual image V The outline W corresponding to the four opening edge portions R1 to R4 described above is formed around the periphery (see FIG. 5).

  At this time, the four opening edge portions R1 to R4 described above are reduced so that the distortion of the upper contour line W1 and the lower contour line W2 among the contour lines W in the virtual image V to be visually recognized by the driver 14 is minimized. Of these, the shape of the upper opening edge R1 and the lower opening edge R2 is not a linear shape as in the prior art, but a curved shape as described above.

  Therefore, even if the windshield 13 (the surface on the driver 14 side of the windshield 13) has a predetermined curvature, the upper opening edge R1 and the lower opening edge R2 are curved with a predetermined curvature. Since the upper contour line W1 and the lower contour line W2 of the virtual image V that the driver 14 will visually recognize become a substantially horizontal contour line by adopting the shape, the contour lines in the virtual image (particularly the upper and lower contour lines). ) Distortion can be reduced as compared with the prior art.

  As described above, in the present embodiment, the liquid crystal display element 23 that emits the display light L, the case 24 having the opening 24a through which the display light L passes, and the base 24b surrounding the opening 24a, and the opening 24a are provided. A concave mirror 31 that reflects the display light L that passes therethrough. The display light L reflected by the concave mirror 31 is irradiated onto the windshield 13 having a predetermined curvature, and the virtual image V obtained by the irradiation is visually recognized by the driver 14. In the vehicle head-up display device, the required portions (that is, the upper opening edge R1 and the lower opening edge R2) at the boundary between the opening 24a and the base 24b are curved so that the curvature of the windshield is increased. It is possible to reduce the distortion of the contour line of the virtual image that has been caused due to this, as compared with the conventional case.

  In this embodiment, the example in which the display light L emitted from the liquid crystal display element 23 is projected onto the windshield 13 has been described. However, for example, a combiner that reflects the display light L in the direction of the driver 14 on the windshield 13 favorably. A film may be provided.

13 Windshield (projection member)
14 Driver (User)
20 Display 22 Light source 23 Liquid crystal display element (display element)
23a Display area 24 Case body 24a Opening 24b Base 30 Reflector 31 Concave mirror (reflective member)
L Display light R1 Upper opening edge R2 Lower opening edge R3 Left opening edge R4 Right opening edge V Virtual image (display image)
W contour line W1 upper contour line W2 lower contour line

Claims (1)

A display element that emits display light, a case body having an opening through which the display light passes and a base that surrounds the opening, and a reflective member that reflects the display light that passes through the opening,
In a vehicle head-up display device that irradiates a projection member having a predetermined curvature with the display light reflected by the reflection member and makes a vehicle user visually recognize a display image obtained by the irradiation.
A vehicle head-up display device characterized in that a required portion at a boundary portion between the opening and the base is curved.

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