# US 10,310,257 B2 · Head-up display device

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- Number: US 10,310,257 B2
- Document ID: US10310257B2
- Status: Granted
- Kind: B2
- Application number: 15/307,121
- Filed: 2014-05-09
- Published: 2017-02-16
- Granted: 2019-06-04
- Earliest claimed: 2014-05-09
- Assignees: Maxell, Ltd.
- Applicants: Maxell, Ltd.
- Inventors: Koji Hirata; Masahiko Yatsu; Akio Misawa
- Web page: https://patentgrep.com/patent/US10310257B2

## CPC

- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- B60K 35/211: {producing three-dimensional [3D] effects, e.g. stereoscopic images}
- B60K 35/231: characterised by their arrangement or structure for integration into vehicles
- B60K 35/28: characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver
- B60K 35/425: {Anti-reflection arrangements}
- B60K 35/60: Instruments characterised by their location or relative disposition in or on vehicles (arrangements of lighting devices on dashboards B60Q3/10)
- B60K 37/20: Dashboard panels
- G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)}
- G02B 27/01: Head-up displays
- G02B 27/0149: {characterised by mechanical features (G02B27/0176 takes precedence)}
- G09G 3/14: Semiconductor devices, e.g. diodes
- G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)}
- H04N 9/3111: {for displaying the colours sequentially, e.g. by using sequentially activated light sources (sequential projection in colour photography G03B33/08)}
- H04N 9/3152: {for shaping the light beam (beam shaping per se G02B27/09)}
- H04N 9/3164: {using multiple light sources}
- H04N 9/3182: {Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607)}
- B60K 2360/785: on or in relation to the windshield or windows
- B60R 2300/205: using a head-up display
- G02B 2027/0118: {comprising devices for improving the contrast of the display / brillance control visibility}
- G02B 2027/0134: {of stereoscopic type}
- G02B 2027/0141: {characterised by the informative content of the display}
- G02B 2027/015: {involving arrangement aiming to get less bulky devices}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR

## Abstract

A head-up display device that displays information including a video in a part of a field of view of an operator (407) includes a video display device (420) that is arranged at a position deviated from the field of view of the operator and generates and projects video light for projecting the information and a transparent screen (410) that is arranged in a part of the field of view of the operator, and transmit light from the field of view and reflects projection light from the video display device in a direction of the operator. A solid-state light source device (421) that reflects and mixes light emitted from a plurality of light-emitting cells (40) and emits the light obtained by the mixing in a predetermined direction is used as a light source constituting the video display device.

## Claims

### Claim 1

A head-up display device that displays information including a video in a part of a field of view of an operator, comprising:
a video display device that is arranged at a position deviated from the field of view of the operator and configured to generate and project video light for projecting the information; and
a transparent screen that is arranged in a part of the field of view of the operator, and configured to transmit light from the field of view and reflect projection light from the video display device in a direction of the operator,
wherein a light source of the video display device is a solid-state light source device configured to reflect and mix light emitted from a plurality of light-emitting cells and emits the light obtained by the mixing in a predetermined direction,
the solid-state light source device includes a light guiding member,
an outer circumference surface of the light guiding member is covered with a reflection film,
a leading end portion of the light guiding member is a paraboloidal surface,
an external shape of the light guiding member is a substantially pyramidal shape that has a rectangular cross section, and
the plurality of light source cells are arranged on the outer circumference surface.

### Claim 2 (depends on 1)

The head-up display device according to claim 1,
wherein the solid-state light source device of the video display device is configured to emit white light, and
the video display device includes an optical modulation unit configured to split the white light emitted from the solid-state light source device into red (R) light, green (G) light, and (blue (B) light and generate the video light, a projection optical system configured to magnify and project the video light output from the optical modulation unit, and an optical direction converting unit configured to receive the video light from the optical modulation unit through the projection optical system and project the video light toward the transparent screen.

### Claim 3 (depends on 2)

The head-up display device according to claim 2,
wherein the video display device further includes a second optical modulation unit in a part of the projection optical system or the optical direction converting unit.

### Claim 4 (depends on 3)

The head-up display device according to claim 3,
wherein the optical modulation unit of the video display device displays a video of information to be displayed in a three dimensional (3D) manner together with the second optical modulation unit.

### Claim 5 (depends on 1)

The head-up display device according to claim 1,
wherein the light source cells emit R light, G light, and B light sequentially and selectively,
the video display device further includes an optical modulation unit configured to generate R light video light, G light video light, and B light video light by sequentially modulating the R light, the G light, and the B light sequentially emitted from the solid-state light source device in a cycling manner, a projection optical system configured to magnify and project the R light video light, the G light video light, and the B light video light output from the optical modulation unit, and an optical direction converting unit configured to receive the R light video light, the G light video light, and the B light video light from the optical modulation unit through the projection optical system, and project the R light video light, the G light video light, and the B light video light toward the transparent screen.

### Claim 6 (depends on 5)

The head-up display device according to claim 5,
wherein the emitting of the R light, the G light, and the B light from the solid-state light source device is performed with a cycle of 120 Hz to 480 Hz.

### Claim 7 (depends on 1)

The head-up display device according to claim 1,
wherein an anti-reflection film is formed on a surface of the transparent screen.

### Claim 8 (depends on 1)

The head-up display device according to claim 1,
wherein the transparent screen has a surface that includes a plurality of fine protrusions having a triangular cross section and a rectangular overall shape.

### Claim 9 (depends on 1)

The head-up display device according to claim 1,
wherein the transparent screen includes a plurality of fine protrusions having a triangular cross section, and the plurality of fine protrusions are formed on a surface on which the projection light from the video display device is received.