WO2022085658A1 - ヘッドアップディスプレイ装置 - Google Patents
ヘッドアップディスプレイ装置 Download PDFInfo
- Publication number
- WO2022085658A1 WO2022085658A1 PCT/JP2021/038518 JP2021038518W WO2022085658A1 WO 2022085658 A1 WO2022085658 A1 WO 2022085658A1 JP 2021038518 W JP2021038518 W JP 2021038518W WO 2022085658 A1 WO2022085658 A1 WO 2022085658A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light
- mirror
- display
- lenticular lens
- lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
- B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
- B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
- B60K35/23—Head-up displays [HUD]
- B60K35/231—Head-up displays [HUD] characterised by their arrangement or structure for integration into vehicles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0966—Cylindrical lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0062—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0145—Head-up displays characterised by optical features creating an intermediate image
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0149—Head-up displays characterised by mechanical features
- G02B2027/015—Head-up displays characterised by mechanical features involving arrangement aiming to get less bulky devices
Definitions
- This disclosure relates to a head-up display device.
- the head-up display device described in Patent Document 1 includes a display that emits display light, a first mirror that reflects the display light emitted by the display, and a display light reflected by the first mirror.
- a second mirror that reflects light is provided. The first mirror crosses the reflected display light up and down at the cross point before reaching the second mirror.
- the present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a head-up display device capable of reducing the divergence angle of the display light that has passed the cross point.
- the head-up display device is A light source that emits light and A liquid crystal panel that receives light from the light source and emits display light, A first mirror that reflects the display light from the liquid crystal panel and crosses the reflected display light at a cross point in the cross direction. A second mirror that is reflected by the first mirror and reflects the display light that has passed through the cross point.
- the present invention includes a first optical element that causes the display light to reach the first mirror in a converged state by converging the light from the light source.
- the divergence angle of the display light that has passed the cross point can be reduced.
- the head-up display device 100 is mounted on the vehicle 200, and by projecting the display light L onto the windshield 201 which is a projected member, the virtual image V including the vehicle information can be visually recognized by the viewer 1. Display on.
- the head-up display device 100 includes a first mirror 11, a second mirror 12, a display unit 20, and a case 30.
- the case 30 is formed in a box shape with a light-shielding resin or metal.
- the first mirror 11, the second mirror 12, and the display unit 20 are housed in the case 30.
- the case 30 includes a translucent window material 31 that transmits the display light L reflected by the second mirror 12 toward the windshield 201 (see FIG. 1).
- the translucent window material 31 is formed in a plate shape by a translucent resin or glass, and is positioned so as to correspond to the windshield 201 in the height direction of the vehicle 200.
- the display unit 20 emits the display light L as convergent light that converges toward the first mirror 11.
- the convergence angle ⁇ of the display light L emitted from the display unit 20 is an angle formed by a light ray at a position farthest from the center of the optical axis with respect to the center of the optical axis.
- the display light L emitted from the display unit 20 converges in the height direction (cross direction) of the vehicle 200 and is parallel in the width direction of the vehicle 200.
- the specific configuration of the display unit 20 will be described later.
- the first mirror 11 is a concave mirror that curves along the height direction of the vehicle 200 and extends linearly along the width direction of the vehicle 200.
- the first mirror 11 reflects the display light L emitted from the display unit 20 toward the second mirror 12.
- the first mirror 11 reflects the display light L from the display unit 20 toward the second mirror 12 so as to cross at the cross point Cr in the height direction of the vehicle 200.
- the cross point Cr is located between the first mirror 11 and the second mirror 12 in the optical path of the display light L.
- the cross point Cr is provided closer to the first mirror 11 than the intermediate position between the first mirror 11 and the second mirror 12.
- the display light L converges from the first mirror 11 to the cross point Cr and diverges from the cross point Cr to the second mirror 12 at the divergence angle ⁇ .
- the divergence angle ⁇ is an angle formed by a light ray at a position farthest from the center of the optical axis with respect to the center of the optical axis of the display light L from the cross point Cr to the second mirror 12.
- the reflective surface 11a of the first mirror 11 faces the front lower side of the vehicle 200.
- the second mirror 12 is a concave mirror that curves along the height direction of the vehicle 200 and extends linearly along the width direction of the vehicle 200.
- the second mirror 12 reflects the display light L reflected from the first mirror 11 toward the windshield 201 (see FIG. 1).
- the second mirror 12 reflects the display light L from the first mirror 11 toward the windshield 201 so as to diverge.
- the reflective surface 12a of the second mirror 12 faces the rear upper side of the vehicle 200.
- the display unit 20 includes a light source substrate 21, a plurality of light sources 22, and an illumination optical system 28 for adjusting the illumination light from the light source 22.
- the illumination optical system 28 adjusts the illumination light from the light source 22.
- the adjustment of the illumination light means the parallelization of the illumination light, the diffusion, the scattering or the convergence of the illumination light.
- the illumination optical system 28 includes a condenser lens 23, a first lenticular lens 24, a second lenticular lens 25, a diffuser 26, and a liquid crystal panel 27.
- the direction along the optical axis of the illumination light emitted from the light source 22 is defined as the Z direction, and the directions orthogonal to the Z direction are defined as the X direction and the Y direction.
- the X and Y directions are orthogonal to each other.
- the X direction is along the lateral direction of the first lenticular lens 24 or the like
- the Y direction is along the longitudinal direction of the first lenticular lens 24 or the like.
- the light source substrate 21, the condenser lens 23, the first lenticular lens 24, the second lenticular lens 25, the diffuser 26, and the liquid crystal panel 27 are arranged along the Z direction along the Z direction, and are made of a light-shielding resin. It is housed in a housing tube (not shown) formed.
- the light source 22 emits illumination light under the control of a control unit (not shown).
- the light source 22 is, for example, an LED (Light Emitting Diode).
- the plurality of light sources 22 are mounted on the main surface of the light source substrate 21.
- the main surface of the light source substrate 21 is a surface of the light source substrate 21 facing the condenser lens 23.
- the plurality of light sources 22 are arranged in a matrix of 2 rows ⁇ 6 columns on the main surface of the light source substrate 21.
- the condenser lens 23 is formed in a plate shape by a translucent resin or glass.
- the condenser lens 23 has a function of substantially parallelizing each ray of illumination light emitted from each light source 22 along the Z direction.
- the condenser lens 23 includes a plurality of convex lens portions 23a arranged in the X direction and the Y direction. Each convex lens portion 23a is formed in the shape of a biconvex lens.
- the plurality of convex lens portions 23a are arranged in a matrix of 2 rows ⁇ 6 columns corresponding to each of the plurality of light sources 22.
- the first lenticular lens 24 is formed in a plate shape by a translucent resin or glass. Specifically, the first lenticular lens 24 includes an incident surface 24i on which light is incident and an ejection surface 24o on which light that has passed through the first lenticular lens 24 in the thickness direction is emitted.
- the incident surface 24i of the first lenticular lens 24 is a surface facing the condenser lens 23.
- the injection surface 24o of the first lenticular lens 24 is a surface facing the second lenticular lens 25.
- a plurality of (11 in this example) cylindrical lens portions 24a are formed on the incident surface 24i of the first lenticular lens 24.
- Each of the plurality of cylindrical lens portions 24a extends in a semi-cylindrical shape extending in the Y direction and forms a cylindrical lens array shape arranged along the X direction.
- the incident surface 24i of the second lens 24 has a function of emitting light in the X direction in order to suppress the occurrence of unevenness in the light intensity in the X direction by the cylindrical lens portion 24a.
- a plurality of (16 in this example) cylindrical lens portions 24b are formed on the ejection surface 24o of the first lenticular lens 24.
- Each of the plurality of cylindrical lens portions 24b extends in a semi-cylindrical shape extending in the X direction and forms a cylindrical lens array shape arranged along the Y direction.
- the ejection surface 24o of the second lens 24 has a function of emitting light in the Y direction in order to suppress the occurrence of unevenness in the light intensity in the Y direction by the cylindrical lens portion 24b.
- the cylindrical lens portions 24a and 24b are arranged in a direction intersecting each other. The divergence angle of light can be adjusted based on the pitch and radius of curvature of the cylindrical lens portions 24a and 24b.
- the second lenticular lens 25 is formed in a plate shape by a translucent resin or glass. Specifically, the second lenticular lens 25 includes an incident surface 25i on which light is incident, and an ejection surface 25o on which light that has passed through the inside of the second lenticular lens 25 in the thickness direction is emitted.
- the incident surface 25i of the second lenticular lens 25 is a surface facing the first lenticular lens 24.
- the ejection surface 25o of the second lenticular lens 25 is a surface facing the diffuser 26.
- the incident surface 25i of the second lenticular lens 25 is formed as a curved surface (cylindrical surface) that is convexly curved along the X direction.
- the incident surface 25i of the second lenticular lens 25 has a function of converging the illumination light as convergent light in the X direction.
- the radius of curvature of the ejection surface 25o determines the convergence angle ⁇ of the illumination light and the display light L.
- the convergence angle ⁇ of the emission surface 25o is set to an angle at which the illumination light from the emission surface 25o can reach the first mirror 11 (see FIG. 2) as the display light L as the convergent light as it is through the liquid crystal panel 27.
- the ejection surface 25o of the second lenticular lens 25 is formed as a curved surface (cylindrical surface) curved in a concave shape along the Y direction.
- the injection surface 25o of the second lenticular lens 25 has a function of diverging the illumination light as divergent light in the Y direction.
- the diffuser 26 is a diverging plate or a diffusing plate that suppresses the occurrence of unevenness in light intensity, and scatters the illumination light that has passed through the second lenticular lens 25 and then radiates it toward the liquid crystal panel 27.
- the liquid crystal panel 27 is a TFT (Thin Film Transistor) type liquid crystal display panel.
- the liquid crystal panel 27 receives the illumination light that has passed through the diffuser 26 and emits the display light L under the control of a control unit (not shown).
- the illumination light emitted from each light source 22 is substantially parallelized so that the light rays extend in the Z direction in the X direction and the Y direction by passing through the condenser lens 23.
- the illumination light transmitted through the condenser lens 23 is incident on the incident surface 24i of the first lenticular lens 24 and is emitted from the exit surface 24o.
- the first lenticular lens 24 emits illumination light passing through the condenser lens 23 in the X direction and the Y direction by the cylindrical lens portions 24a and 24b. This reduces unevenness in light intensity in the X and Y directions.
- the illumination light transmitted through the first lenticular lens 24 is incident on the incident surface 25i of the second lenticular lens 25 and is emitted from the exit surface 25o.
- the second lenticular lens 25 is oriented by the convex lens-shaped incident surface 25i so that the illumination light is converged in the X direction, that is, toward the center of the optical axis as the illumination light advances.
- the second lenticular lens 25 is oriented so as to diverge the illumination light in the Y direction by the concave lens-shaped emission surface 25o, that is, to move away from the center of the optical axis as the illumination light advances.
- the illumination light transmitted through the second lenticular lens 25 is scattered by the diffuser 26 and then illuminates the liquid crystal panel 27.
- the liquid crystal panel 27 receives the illumination light that has passed through the diffuser 26 and emits the display light L.
- the display light L emitted from the liquid crystal panel 27 is in a state of being converged in the X direction by the incident surface 25i of the second lenticular lens 25, and is in a state of being radiated in the Y direction by the exit surface 25o of the second lenticular lens 25.
- the display light L converging in the X direction is reflected by the first mirror 11, heads toward the second mirror 12 while maintaining the converged state, and diverges after crossing at the cross point Cr.
- the display light L diverging in the Y direction is reflected by the first mirror 11 and reaches the second mirror 12 while maintaining the diverging state. Then, the display light L is reflected by the second mirror 12 toward the windshield 201 (see FIG. 1). The display light L reflected by the windshield 201 reaches the viewer 1, whereby the virtual image V becomes visible to the viewer 1.
- the head-up display device 100 reflects and reflects the light source 22 that emits light, the liquid crystal panel 27 that receives the light from the light source 22 and emits the display light L, and the display light L from the liquid crystal panel 27.
- the first mirror 11 that crosses the displayed display light L in the cross direction (the height direction of the vehicle 200) at the cross point Cr, and the display light L that is reflected by the first mirror 11 and passes through the cross point Cr are reflected. It includes two mirrors 12 and a second wrenchular lens 25, which is an example of a first optical element that causes the display light L to reach the first mirror 11 in a converged state by converging the light from the light source 22.
- the display light L emitted from the liquid crystal panel 27 reaches the first mirror 11 in a converged state. Therefore, the divergence angle ⁇ of the display light L that has passed the cross point Cr can be reduced. As a result, the size of the second mirror 12 can be reduced.
- the light path Lq located at the outer edge of the vertical plane of the optical axis of the display light shown by the broken line in FIG. 2 is larger than the display light L having the above configuration. Located on the outside.
- the divergence angle ⁇ of the display light that has passed the cross point Cr in the comparative example is larger than the divergence angle ⁇ of the display light L having the above configuration. Therefore, in the comparative example, it is necessary to increase the sizes of the first mirror and the second mirror in order to make the display light reflective. In this respect, in the above configuration, since the divergence angle ⁇ of the display light L that has passed the cross point Cr becomes small, the size of the first mirror 11 and the second mirror 12, and eventually the size of the head-up display device 100 should be reduced. Can be done.
- the second lenticular lens 25 has an incident surface 25i, which has a positive power and is an example of a convex lens surface that converges the light from the light source 22. According to this configuration, the light from the light source 22 can be converged by the convex lens surface of the second lenticular lens 25.
- the head-up display device 100 has a condenser lens 23, which is an example of a second optical element that substantially parallelizes the light emitted from the light source 22, and the light that is substantially parallelized by the condenser lens 23.
- the first wrenchular lens 24, which is an example of the third optical element emitted from the second wrenchular lens 25, is provided. According to this configuration, the light emitted from the light source 22 by the condenser lens 23 is substantially parallelized, and the light is radiated by the first lenticular lens 24. In this way, the light is adjusted by the time it reaches the second lenticular lens 25.
- the incident surface 24i and the exit surface 24o of the first lenticular lens 24 are formed in a cylindrical lens array shape having cylindrical lens portions 24a and 24b extending in directions intersecting each other, respectively. According to this configuration, the light is diffused by one first lenticular lens 24 so as to suppress unevenness of light intensity in two directions (for example, the X direction and the Y direction).
- the exit surface 25o of the second lenticular lens 25 is formed as a curved surface curved in a concave shape along the Y direction.
- both ends of the incident surface 25i of the second lenticular lens 25 in the Y direction are the first lenticular lenses.
- the distance between the first lenticular lens and the second lenticular lens may increase in order to prevent contact with the lens.
- the exit surface 25o of the second lenticular lens 25 is formed as a curved surface curved in a concave shape along the Y direction, the distance between the first lenticular lens 24 and the second lenticular lens 25 is set. It can be made smaller.
- the indicator light L is crossed in the height direction of the vehicle 200, but instead of or in addition to this, the indicator light L may be crossed in the width direction of the vehicle 200.
- the reflective surface 11a of the first mirror 11 is formed in a concave shape curved along the width direction of the vehicle 200.
- a plurality of cylindrical lens portions 24a are formed on the injection surface 24o of the first lenticular lens 24, and as shown in FIG. 6, a plurality of cylindrical lens portions 24b are formed on the incident surface 24i of the first lenticular lens 24. May be formed. That is, the modified example 1 is configured by turning the first lenticular lens 24 upside down so that the incident surface 24i and the ejection surface 24o of the first lenticular lens 24 in the above embodiment are opposite to each other. Even in this case, the first lenticular lens 24 can diffuse the illumination light in the X direction and the Y direction as in the above embodiment.
- the incident surface 25i of the second lenticular lens 25 is formed in a planar shape along the X and Y directions, and the exit surface 25o of the second lenticular lens 25 is curved convexly along the X direction. It may be formed as a curved surface.
- the exit surface 25o of the second lenticular lens 25 is formed as a toroidal surface that is convexly curved along the X direction and concavely curved along the Y direction.
- the exit surface 25o of the second lenticular lens 25 converges the illumination light as convergent light in the X direction as in the incident surface 25i of the above embodiment, and also uses the illumination light as divergence light in the Y direction. Make it diverge.
- a concave mirror 29 which is an example of the first optical element, may be provided.
- the concave mirror 29 reflects the illumination light toward the liquid crystal panel 27 so as to converge the illumination light as convergent light in the direction corresponding to the X direction. Even with this configuration, the same effects as those of the above embodiment can be obtained.
- the configurations of the condenser lens 23, the first lenticular lens 24, and the second lenticular lens 25 are not limited to the above modifications 1 to 3, and further changes can be made.
- the cylindrical lens portions 24a and 24b of the first lenticular lens 24 are arranged so as to intersect each other, but the present invention is not limited to this, and the cylindrical lens portions 24a and 24b may extend in the same direction.
- a cylindrical lens portion extending in the Y direction and lining up in the X direction is formed on both the incident surface 24i and the exit surface 24o of the first lenticular lens 24 shown in FIG. 7, and the second lenticular lens 25 shown in FIG. 8 is formed. Cylindrical lens portions extending in the X direction and lining up in the Y direction may be formed on the incident surface 25i.
- two first lenticular lenses 24 may be arranged so as to face each other.
- the first lenticular lens extends in the Y direction on both the entrance surface and the emission surface, and a cylindrical lens portion arranged in the X direction is formed, and the second lenticular lens is formed on both the entrance surface and the emission surface. Cylindrical lens portions extending in the X direction and lining up in the Y direction may be formed.
- the second lenticular lens 25 may be provided upside down so that the incident surface 25i and the exit surface 25o of the second lenticular lens 25 are opposite to each other. Further, the diffuser 26 in the above embodiment can be omitted.
- the second mirror 12 may be configured to be rotatable by a mirror drive unit about a rotation axis along the vehicle width direction. By rotating the second mirror 12 around the rotation axis, it is possible to adjust the irradiation position of the display light L to the viewer 1 in the height direction.
- the head-up display device 100 is mounted on a vehicle, but the present invention is not limited to this, and the head-up display device 100 may be mounted on a vehicle such as an airplane or a ship. Further, the projected member is not limited to the windshield 201, and may be a dedicated combiner.
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Abstract
Description
光を放射する光源と、
前記光源からの光を受けて表示光を放射する液晶パネルと、
前記液晶パネルからの前記表示光を反射し、反射した前記表示光をクロス方向にクロス点でクロスさせる第1ミラーと、
前記第1ミラーにて反射して前記クロス点を通過した前記表示光を反射する第2ミラーと、
前記光源からの光を収束させることにより、前記表示光を収束した状態で前記第1ミラーに到達させる第1光学素子と、を備える。
図1に示すように、ヘッドアップディスプレイ装置100は、車両200に搭載され、表示光Lを被投射部材であるウインドシールド201に投射することにより車両情報を含む虚像Vを視認者1により視認可能に表示する。
ケース30は遮光性の樹脂又は金属により箱状に形成されている。ケース30内には第1ミラー11、第2ミラー12及び表示ユニット20が収容されている。
表示ユニット20の具体的な構成については後述する。
第1ミラー11は、車両200の高さ方向において表示ユニット20からの表示光Lをクロス点Crにてクロスさせるように第2ミラー12に向けて反射する。クロス点Crは、表示光Lの光路において第1ミラー11と第2ミラー12の間に位置する。クロス点Crは、第1ミラー11と第2ミラー12の中間位置よりも第1ミラー11の近くに設けられる。表示光Lは、第1ミラー11からクロス点Crまで収束し、クロス点Crから第2ミラー12まで発散角βにて発散する。発散角βは、クロス点Crから第2ミラー12までの表示光Lの光軸中心に対して光軸中心から最も離れた位置の光線がなす角度である。
第1ミラー11の反射面11aは、車両200の前方下側を向いている。
図3及び図4に示すように、表示ユニット20は、光源基板21と、複数の光源22と、光源22からの照明光を調整する照明光学系28と、を備える。照明光学系28は、光源22からの照明光を調整する。照明光の調整とは、照明光の平行化、照明光の拡散、散乱又は収束を言う。
照明光学系28は、コンデンサレンズ23と、第1レンチキュラレンズ24と、第2レンチキュラレンズ25と、ディフューザー26と、液晶パネル27と、を備える。
以下の説明では、光源22から放射される照明光の光軸に沿う方向をZ方向と規定し、Z方向に直交する方向をX方向及びY方向と規定する。X方向及びY方向は互いに直交する。本例では、X方向は第1レンチキュラレンズ24等の短手方向に沿い、Y方向は第1レンチキュラレンズ24等の長手方向に沿う。X方向及びZ方向に沿うクロス面において表示光Lがクロスするクロス点Cr(図1参照)が存在する。このクロス面は、車両高さ方向及び車両前後方向に沿う。
光源基板21、コンデンサレンズ23、第1レンチキュラレンズ24、第2レンチキュラレンズ25、ディフューザー26及び液晶パネル27は、それぞれの厚さ方向がZ方向に沿いZ方向に沿って並べられ、遮光性樹脂により形成される収容筒部(図示略)内に収容される。
コンデンサレンズ23は、X方向及びY方向に並べられる複数の凸レンズ部23aを備える。各凸レンズ部23aは両凸レンズ状に形成される。複数の凸レンズ部23aは、それぞれ複数の光源22に対応して2行×6列のマトリックス状に配置されている。
シリンドリカルレンズ部24a,24bは互いに交差する方向に配置される。シリンドリカルレンズ部24a,24bのピッチ及び曲率半径に基づき、光の発散角を調整することができる。
図3及び図4に示すように、各光源22から放射された照明光は、コンデンサレンズ23を透過することによりX方向及びY方向において光線がZ方向に延びるように略平行化される。コンデンサレンズ23を透過した照明光は、第1レンチキュラレンズ24の入射面24iに入射し、出射面24oから出射する。図3及び図4に示すように、第1レンチキュラレンズ24は、シリンドリカルレンズ部24a,24bにより、X方向及びY方向において、コンデンサレンズ23を経た照明光を発散する。これにより、X方向及びY方向における光強度のムラが低減する。
以上、説明した一実施形態によれば、以下の効果を奏する。
(1)ヘッドアップディスプレイ装置100は、光を放射する光源22と、光源22からの光を受けて表示光Lを放射する液晶パネル27と、液晶パネル27からの表示光Lを反射し、反射した表示光Lをクロス方向(車両200の高さ方向)にクロス点Crでクロスさせる第1ミラー11と、第1ミラー11にて反射してクロス点Crを通過した表示光Lを反射する第2ミラー12と、光源22からの光を収束させることにより、表示光Lを収束した状態で第1ミラー11に到達させる第1光学素子の一例である第2レンチキュラレンズ25と、を備える。
この構成によれば、液晶パネル27から放射された表示光Lは収束した状態で第1ミラー11に到達する。このため、クロス点Crを過ぎた表示光Lの発散角βを小さくすることができる。これにより、第2ミラー12のサイズを小さくすることができる。以下、具体的に説明する。例えば、液晶パネルから放射された表示光が平行光である比較例では、図2の破線で示す表示光の光軸垂直面の外縁に位置する光線経路Lqは、上記構成の表示光Lよりも外側に位置する。また、比較例でのクロス点Crを過ぎた表示光の発散角θは、上記構成の表示光Lの発散角βよりも大きくなる。このため、当該比較例では、表示光を反射可能とするために、第1ミラー及び第2ミラーのサイズを大きくする必要があった。この点、上記構成では、クロス点Crを過ぎた表示光Lの発散角βが小さくなるため、第1ミラー11及び第2ミラー12のサイズ、ひいては、ヘッドアップディスプレイ装置100のサイズを小さくすることができる。
この構成によれば、第2レンチキュラレンズ25の凸レンズ面により、光源22からの光を収束させることができる。
この構成によれば、コンデンサレンズ23により光源22から放射された光が略平行化され、第1レンチキュラレンズ24により光が発散される。このように、第2レンチキュラレンズ25に到達するまでに光が調整される。
この構成によれば、1つの第1レンチキュラレンズ24により2つの方向(例えば、X方向及びY方向)において光強度のムラが抑制されるように光が拡散される。
上記実施形態においては、表示光Lは、車両200の高さ方向においてクロスしていたが、これに代えて、又はこれに加えて、車両200の幅方向においてクロスしていてもよい。この場合、第1ミラー11の反射面11aは、車両200の幅方向に沿って湾曲した凹状に形成されている。
まず、変形例1について説明する。図5に示すように、第1レンチキュラレンズ24の射出面24oに複数のシリンドリカルレンズ部24aが形成され、図6に示すように、第1レンチキュラレンズ24の入射面24iに複数のシリンドリカルレンズ部24bが形成されてもよい。すなわち、上記実施形態における第1レンチキュラレンズ24の入射面24iと射出面24oとが反対となるように第1レンチキュラレンズ24が表裏逆とされることにより変形例1が構成される。この場合でも、第1レンチキュラレンズ24は、上記実施形態と同様に、照明光をX方向及びY方向に拡散することができる。
次に、変形例2について説明する。図7に示すように、第2レンチキュラレンズ25の入射面25iはX方向及びY方向に沿う平面状に形成され、第2レンチキュラレンズ25の出射面25oはX方向に沿って凸状に湾曲した曲面として形成されてもよい。この場合、第2レンチキュラレンズ25の出射面25oはX方向に沿って凸状に湾曲し、Y方向に沿って凹状に湾曲したトロイダル面として形成されている。この構成では、第2レンチキュラレンズ25の出射面25oは、上記実施形態の入射面25iと同様にX方向に照明光を収束光として収束させるのに加えて、Y方向に照明光を発散光として発散させる。
次に、変形例3について説明する。上記実施形態における第2レンチキュラレンズ25に代えて、図9に示すように、第1光学素子の一例である凹面鏡29が設けられてもよい。凹面鏡29は、X方向に対応する方向に照明光を収束光として収束させるように液晶パネル27に向けて反射する。この構成でも、上記実施形態と同様の作用効果を奏することができる。
コンデンサレンズ23、第1レンチキュラレンズ24及び第2レンチキュラレンズ25の構成は、上記変形例1~3に限らず、さらなる変更が可能である。
例えば、上記実施形態では、第1レンチキュラレンズ24のシリンドリカルレンズ部24a,24bは互いに交差するように配置されていたが、これに限らず、互いに同じ方向に延びていてもよい。
また、例えば、図7に示す第1レンチキュラレンズ24の入射面24iと出射面24oの両面にY方向に延び、X方向に並ぶシリンドリカルレンズ部が形成され、図8に示す第2レンチキュラレンズ25の入射面25iにX方向に延び、Y方向に並ぶシリンドリカルレンズ部が形成されてもよい。
また、例えば、第1レンチキュラレンズ24は2枚対面するように並べられてもよい。1枚目のレンチキュラレンズは、その入射面と出射面の両面にY方向に延び、X方向に並ぶシリンドリカルレンズ部が形成され、2枚目のレンチキュラレンズは、その入射面と出射面の両面にX方向に延び、Y方向に並ぶシリンドリカルレンズ部が形成されてもよい。
また、上記実施形態におけるディフューザー26は省略可能である。
11 第1ミラー
11a,12a 反射面
12 第2ミラー
20 表示ユニット
21 光源基板
22 光源
23 コンデンサレンズ
23a 凸レンズ部
24 第1レンチキュラレンズ,第2のレンズ
24a,24b シリンドリカルレンズ部
24i,25i 入射面
24o,25o 射出面
25 第2レンチキュラレンズ
26 ディフューザー
27 液晶パネル
28 照明光学系
29 凹面鏡
30 ケース
31 透光窓材
100 ヘッドアップディスプレイ装置
200 車両
201 ウインドシールド
α 収束角
β,θ 発散角
L 表示光
V 虚像
Cr クロス点
Lq 光線経路
Claims (4)
- 光を放射する光源と、
前記光源からの光を受けて表示光を放射する液晶パネルと、
前記液晶パネルからの前記表示光を反射し、反射した前記表示光をクロス方向にクロス点でクロスさせる第1ミラーと、
前記第1ミラーにて反射して前記クロス点を通過した前記表示光を反射する第2ミラーと、
前記光源からの光を収束させることにより、前記表示光を収束した状態で前記第1ミラーに到達させる第1光学素子と、を備える、
ヘッドアップディスプレイ装置。 - 前記第1光学素子は、正のパワーを持ち、前記光源からの光を収束させる凸レンズ面を備える、
請求項1に記載のヘッドアップディスプレイ装置。 - 前記光源から放射された光を略平行化する第2光学素子と、
前記第2光学素子により略平行化された光を発散させたうえで前記第1光学素子に出射する第3光学素子と、を備える、
請求項1又は2に記載のヘッドアップディスプレイ装置。 - 前記第3光学素子の入射面と出射面は、それぞれ、互いに交差する方向に延びるシリンドリカルレンズアレイ形状に形成されている、
請求項3に記載のヘッドアップディスプレイ装置。
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| JP2022557543A JP7743838B2 (ja) | 2020-10-20 | 2021-10-19 | ヘッドアップディスプレイ装置 |
| DE112021005530.5T DE112021005530T5 (de) | 2020-10-20 | 2021-10-19 | Head-up-Display-Vorrichtung |
| US18/248,451 US11960080B2 (en) | 2020-10-20 | 2021-10-19 | Head-up display device |
| CN202180063121.9A CN116490814A (zh) | 2020-10-20 | 2021-10-19 | 平视显示装置 |
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| US20230296891A1 (en) * | 2022-03-15 | 2023-09-21 | Panasonic Automotive Systems Company Of America, Division Of Panasonic Corporation Of North America | Method to optimize uniformity of head-up display image brightness |
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| JP2009192789A (ja) * | 2008-02-14 | 2009-08-27 | Mitsubishi Electric Corp | 照明光学系および画像表示装置 |
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| WO2017183556A1 (ja) * | 2016-04-20 | 2017-10-26 | 日本精機株式会社 | ヘッドアップディスプレイ装置 |
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| JP2005284051A (ja) * | 2004-03-30 | 2005-10-13 | Hitachi Ltd | 半導体発光素子、それを用いた光源ユニット、光学ユニット及び映像表示装置 |
| GB2534151A (en) * | 2015-01-14 | 2016-07-20 | Jaguar Land Rover Ltd | Head-up display apparatus |
| WO2016208195A1 (ja) * | 2015-06-26 | 2016-12-29 | パナソニックIpマネジメント株式会社 | ヘッドアップディスプレイおよびヘッドアップディスプレイを搭載した移動体 |
| JP6586646B2 (ja) * | 2015-07-01 | 2019-10-09 | パナソニックIpマネジメント株式会社 | ヘッドアップディスプレイ及びヘッドアップディスプレイを備えた移動体 |
| EP3379321B1 (en) * | 2015-11-30 | 2020-11-04 | Panasonic Intellectual Property Management Co., Ltd. | Image display device and headup display equipped with image display device |
| CN109937321B (zh) * | 2017-01-25 | 2021-09-17 | 麦克赛尔株式会社 | 前灯装置 |
| JP6865775B2 (ja) * | 2017-01-27 | 2021-04-28 | マクセル株式会社 | ヘッドライト装置 |
| JP7115471B2 (ja) | 2017-04-27 | 2022-08-09 | 日本精機株式会社 | ヘッドアップディスプレイ装置 |
| EP3671315B1 (en) * | 2018-11-28 | 2022-11-30 | Ricoh Company, Ltd. | Display device and mobile object |
| JP7202191B2 (ja) * | 2019-01-17 | 2023-01-11 | マクセル株式会社 | 車両用情報表示システム |
| JP7561512B2 (ja) * | 2020-04-03 | 2024-10-04 | マクセル株式会社 | 情報表示装置 |
| US11262579B1 (en) * | 2020-09-01 | 2022-03-01 | Zebra Technologies Corporation | Optical arrangement of adaptive illumination system with variable illuminating angle and VCM motor |
| CN114545622A (zh) * | 2020-11-20 | 2022-05-27 | 群创光电股份有限公司 | 光学系统以及抬头显示器 |
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| WO2008114502A1 (ja) * | 2007-03-19 | 2008-09-25 | Panasonic Corporation | レーザ照明装置及び画像表示装置 |
| JP2009192789A (ja) * | 2008-02-14 | 2009-08-27 | Mitsubishi Electric Corp | 照明光学系および画像表示装置 |
| US20130258216A1 (en) * | 2012-03-30 | 2013-10-03 | Shin-Gwo Shiue | Pico projection light system |
| WO2017183556A1 (ja) * | 2016-04-20 | 2017-10-26 | 日本精機株式会社 | ヘッドアップディスプレイ装置 |
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| US20230367119A1 (en) | 2023-11-16 |
| JPWO2022085658A1 (ja) | 2022-04-28 |
| CN116490814A (zh) | 2023-07-25 |
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