JP2021162704A - Head-up display device and head-up display system - Google Patents

Abstract

To reduce reflection on a surface of a projection target member to prevent the occurrence of double images.SOLUTION: A head-up display device projects display light on a projection target member 60 to allow an observer who arranges the eyes in an eye box to visually recognize a virtual image. A polarized light control element 50 is arranged on a light path of the display light from a display 21, and adjusts the direction of the polarization axis E of the display light for each of the areas on which the display light is incident. A processor executes polarized light pattern control of making the direction of the polarization axis E for each of the areas of the polarized light control element 50 different so as to reduce reflection on a surface of the projection target member 60 based on the positions of the eyes of the observer.SELECTED DRAWING: Figure 10

Description

The present disclosure relates to a head-up display device and a head-up display system used for a moving body such as a vehicle.

A head-up display device that visualizes a virtual image by providing a hologram element with high diffraction efficiency (reflectance) for light in a specific wavelength region on the windshield of the vehicle and projecting the display light of the display image generated inside onto it. Is described.

In Patent Document 1, the angle of light incident on the hologram element is set to Brewster's angle, and the light is incident on the windshield including the hologram element with P-polarized light, thereby reducing the surface reflection of the windshield and the window. A method has been proposed in which the light transmitted through the shield is diffracted by a hologram element and directed toward the observer.

Japanese Unexamined Patent Publication No. 2011-227281

However, focusing on the light beam reflected by the projected member and incident on the observer's predetermined eye position, the display light emitted from the head-up display device has an emission angle having a predetermined width. Due to the curved surface of the windshield (projected member) or a combination of these, the light beam reflected in each predetermined direction in each region of the projected member is directed to a part of the projected portion. Is incident with P-polarized light, but is not incident with P-polarized light in other parts (in other words, it is not incident with P-polarized light over the entire area of the projected member). Even if the angle is Brewster's angle, it is assumed that the surface is reflected by the windshield, and there is room for improvement from this point of view.

A summary of the particular embodiments disclosed herein is presented below. It should be understood that these aspects are presented solely to provide the reader with an overview of these particular embodiments and do not limit the scope of this disclosure. In fact, the present disclosure may include various aspects not described below.

The outline of the present disclosure improves the display quality of a virtual image. More specifically, it relates to reducing surface reflection on the projected member and suppressing the generation of double images.

Therefore, the head-up display system disclosed in the present specification is a head-up display system that allows an observer who places an eye in an eye box to visually recognize a virtual image, and is a projected member having a reflective diffractive element and display light. A display that emits light, relay optics that directs the display light from the display to the projected member, and a polarization axis of the display light for each region in which the display light is incident, which is arranged on the optical path of the display light from the display. A polarization control element that adjusts the orientation of the light, one or more I / O interfaces that can acquire information, one or more processors, a memory, and stored in the memory and executed by one or more processors. With one or more computer programs configured to be configured, the I / O interface obtains information indicating the observer's eye position, or information in which the eye position can be estimated, and one or more. The plurality of processors perform polarization pattern control in which the orientation of the polarization axis is different for each region of the polarization control element so that the surface reflection by the projected member is reduced based on the eye position.

FIG. 1 is a diagram showing a configuration of a head-up display system according to the present embodiment, and shows an aspect adopted in an automobile. FIG. 2 shows the configuration of the HUD device of the above embodiment. FIG. 3 is a block diagram of a head-up display system according to some embodiments. FIG. 4 is a flow chart showing a method of performing an operation of setting a polarization pattern based on an observer's eye position according to some embodiments. FIG. 5A is a diagram for providing a description of the arrangement of spatial regions corresponding to polarization patterns in some embodiments. FIG. 5B is a diagram for providing a description of the arrangement of spatial regions corresponding to polarization patterns in some embodiments. FIG. 5C is a diagram for providing a description of the arrangement of spatial regions corresponding to polarization patterns in some embodiments. FIG. 6 provides a description of the configuration of the display in the HUD device of the first embodiment. FIG. 7 provides a description of the configuration of the display in the HUD device of the second embodiment. FIG. 8 provides a description of the configuration of the display in the HUD device of the third embodiment. FIG. 9 is a conceptual diagram showing the polarization axes of the display light incident on the projected member as seen from an observer facing the front of the vehicle. FIG. 10 is an enlarged view of a main part of FIG. 9, and is a diagram showing the polarization axes of the display light incident on each partial region of the projected member. FIG. 11 is a diagram showing an aspect of the polarization axis of the display light incident on the projected member. FIG. 12 is a diagram showing an aspect of the polarization axis of the display light incident on the projected member. FIG. 13 is a diagram providing an explanation of a first aspect of the polarization pattern in which the orientation of the polarization axis with respect to the position of the projected member is changed stepwise, and a second aspect in which the orientation of the polarization axis is continuously changed. It is a figure which shows the direction (vertical axis) of the polarization axis with respect to the position (horizontal axis) in the left-right direction of.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments (including the contents of the drawings). Of course, changes (including deletion of components) can be made to the following embodiments. Further, in the following description, in order to facilitate understanding of the present invention, description of known technical matters will be omitted as appropriate.

Hereinafter, FIGS. 1 to 13 provide a description of the head-up display system and the head-up display device according to the present embodiment.

FIG. 1 is a diagram showing a configuration of a head-up display system according to an embodiment of the present invention, showing an embodiment adopted in an automobile. The head-up display system of the present invention can be used not only in automobiles but also in display devices in mobile objects. In the drawings used in this embodiment, the left-right direction of the vehicle is the X-axis direction (the left side when facing the front of the vehicle is the X-axis positive direction), and the vertical direction is the Y-axis direction (above the vehicle traveling on the road surface). The side is the Y-axis positive direction), and the front-rear direction of the vehicle is the Z-axis direction (the front of the vehicle is the Z-axis positive direction).

The head-up display system 10 of FIG. 1 is mounted on the vehicle 1, has a head-up display device (hereinafter, also referred to as a HUD device) 20, a display control device 40 that controls the HUD device 20, and a reflection type diffraction described later. The element 80 is included, and is composed of a projected member 60 that receives the display light 20a from the HUD device 20. The HUD device 20 is a vehicle front windshield (projected member 60) arranged in front of an observer (typically, a driver seated in the driver's seat of the vehicle) (forward, which can be said to be the traveling direction of the vehicle). The display light 20a is projected toward (1 example).

The HUD device 20 (relay optics (25)) projects the display light 20a at an angle incident on the projected member 60 including the reflective diffraction element 80 described later at an angle close to the Brewster angle. The Brewster angle (polarization angle) represents the incident angle at which the reflectance of P-polarized light becomes 0 at the interface between substances having different refractive indexes, and is the angle obtained by arctan N when the refractive index of the projected member 60 is N. be. The front windshield is, for example, PMMA (Polymethyl Polypolylate), and since the refractive index N of PMMA is 1.49, the Brewster angle is 56.3 degrees. The reflectance of P-polarized light increases again when the angle of incidence on the projected member 60 is far from the Brewster's angle (larger or smaller than the Brewster's angle). P-polarized light is polarized light in which an electric field oscillates in the incident plane. The incident surface is a surface containing the reflected light and the incident light from the projected member 60 toward a predetermined point (for example, the center 205) in the eye box 200.

The reflective diffraction element 80 may include, for example, at least one of a holographic element and a diffraction optical element (DOE). The holographic element is an optical member made of, for example, a hologram material such as a photopolymer or gelatin dichromate, which diffracts incident light in a desired direction, and records an interference pattern between object light and reference light. Is created by. The reflective diffraction element 80 is, for example, in the form of a sheet, is included in the projected member 60, and diffracts the display light 20a projected by the HUD device 20 into the eye box 200, which is a predetermined region inside the vehicle 1. For example, the reflection type diffraction element 80 described later can increase the size of the image (virtual image) visually recognized by the observer by diffracting the display light 20a received from the HUD device 20. By arranging the eyes in the eye box 200, the observer can visually recognize the virtual image V of the display image displayed by the HUD device 20 on the side farther from the projected member 60. The reflective diffraction element 80 may be formed on the surface of the projected member 60 (the surface on the observer side).

The "eye box" used in the description of the present embodiment means that the entire display image displayed on the display surface 30 can be visually recognized as a virtual image V in the area (1), and the display image displayed on the display surface 30 outside the area. At least a part of the display image is not visible as a virtual image V, and (2) at least a part of the display image displayed on the display surface 30 described later is visible as a virtual image V in the area, and is displayed on the display surface 30 outside the area. A part of the image is not visually recognized as a virtual image V, a region (3) in which the virtual image V of the displayed image can be visually recognized three-dimensionally, and a virtual image V is not three-dimensionally visible outside the region, or a region (4) is displayed. A region in which at least a part of the virtual image V of the display image displayed on the surface 30 can be visually recognized at a predetermined brightness or higher, and the entire virtual image V of the display image displayed on the display surface 30 is less than the predetermined brightness outside the region. Is. That is, when the observer arranges the eyes (both eyes) 3 outside the eye box 200, the observer cannot normally see the entire virtual image V of the displayed image, or the entire visibility of the virtual image V of the displayed image is very high. Low and hard to perceive. The predetermined brightness is, for example, about 1/50 of the brightness of the display image at the center of the eye box. The "eye box" is the same as the area (also referred to as eye lip) where the observer's viewpoint position is expected to be arranged in the vehicle on which the HUD device 20 is mounted, or most of the eye lip (for example, 80% or more). Is set to include.

The virtual image display area 100 is a plane, a curved surface, or a partially curved surface region, and is also called an image plane. The virtual image display area 100 is a position where a virtual image of the display surface 30 of the display device (display) 21 described later of the HUD device 20 is formed. That is, the virtual image display area 100 is a display surface of the HUD device 20 described later. Corresponding to 30 (in other words, the virtual image display area 100 has a conjugate relationship with the display surface 30 of the display 21 described later), and the virtual image visually recognized in the virtual image display area 100 is the display described later in the HUD device 20. It can be said that it corresponds to the display image displayed on the surface 30. It is preferable that the virtual image display area 100 itself has low visibility to the extent that it is not actually visible to the observer or is difficult to see.

FIG. 2 is a diagram showing a configuration of the HUD device 20 of the present embodiment. The HUD device 20 includes a display 21 that emits the display light 20a of the display image, and a relay optical 25 that directs the display light 20a emitted by the display 21 toward the projected member 60. Although the display 21 of the present embodiment described later is a 2D display, it may be a 3D display. That is, the HUD device 20 displays a parallax image (or a light field image) corresponding to the eye points (left and right eyes) arranged in the eye box 200, thereby displaying a virtual image of a stereoscopic image with reference to the virtual image display area 100. (Note that the 3D display may not be a binocular parallax type or light field type 3D display).

The relay optics 25 is composed of a first mirror 26 which is a planar mirror having no optical power and a second mirror 28 which is a concave mirror having positive optical power. The first mirror 26 is arranged on the optical path of the display light 20a from the display 21 and reflects the display light 20a. The second mirror 28 is arranged on the optical path of the display light 20a reflected by the first mirror 26, and reflects the display light 20a. The relay optical 25, together with the projected member 60, functions as a virtual image optical system for forming a virtual image V of the displayed image. The virtual image optical system is composed of a plurality of optical members, and adjusts the arrangement of the plurality of optical members and / or adjusts the total (or a part) optical power of one (or more) optical members. By doing so, the size (magnification), arrangement, and / or shape of a part or the whole of the virtual image V to be visually recognized by the observer can be adjusted.

Further, the relay optical 25 of the present embodiment has an image enlargement function (an example of an optical function) for forming an image of the display image generated by the display 21 as an enlarged virtual image V, and a distortion-free (less distortion) virtual image. It may have an image distortion correction function (an example of an optical function) for forming an image as an image. By providing the relay optics 25 with a concave mirror function (image enlargement function and / or image distortion correction function), it is possible to provide the observer with a large virtual image and a virtual image with less distortion, and in the HUD device 20. It is also possible to reduce the size of the display 21 and other optical systems (which may also include the relay optical 25), and thus to reduce the size of the entire HUD device 20. The relay optics 25 of the present embodiment is composed of only the catadioptric system, but instead of (or in addition to) these, a refraction optical system such as a lens, a diffractive optical system such as a hologram, and the like are known. It may include various optics. The relay optics 25 may be omitted.

The polarization control element 50 is composed of, for example, a liquid crystal element, and the polarization axis E of light transmitted through the polarization control element 50 can be rotated in an arbitrary direction by voltage control by a processor 43 described later. Therefore, by making the voltage control in the plane of the polarization control element 50 different, the direction of the polarization axis E of the indicating light 20a passing through can be made different for each region of the polarization control element 50.

The polarization control element 50 is arranged on the surface of the display surface 30 of the display 21, that is, the surface on the observer side. When the linearly polarized image incident from the display 21 is incident on the polarization control element 50, the direction of the polarization axis E is rotated (polarized conversion is performed) by a predetermined angle set for each region, so that different polarizations are obtained for each region. It is emitted as a patterned polarized image having an axis E. The pixels of the polarization control element 50 make it possible to control the polarization state to an intermediate value between the bright state and the dark state, and by voltage control including the intermediate value, the polarization state is set for each region in the plane of the liquid crystal cell 410. Control. The polarization axis E set in the plane of the display light 21a transmitted through the polarization control element 50 is 80 to 100 [degree] or 260 to 280 [degree] with respect to the linearly polarized polarization axis incident from the display surface 30. ] (Preferably 85-95 [degree], or 265-275 [degree]) are arranged differently.

FIG. 3 is a block diagram of the head-up display system 10 according to some embodiments. The display control device 40 includes one or more I / O interfaces 41, one or more processors 43, one or more image processing circuits 45, and one or more memories 37. The various functional blocks described in FIG. 3 may consist of hardware, software, or a combination of both. FIG. 3 is only one embodiment, and the illustrated components may be combined with a smaller number of components, or there may be additional components. For example, the image processing circuit 45 (for example, a graphic processing unit) may be included in one or more processors 43.

As shown, the processor 43 and the image processing circuit 45 are operably connected to the memory 37. More specifically, the processor 43 and the image processing circuit 45 execute a program stored in the memory 37 to generate and / or transmit image data, for example, in the head-up display system 10 (image display). The operation of unit 20) can be performed. The processor 43 and / or the image processing circuit 45 includes at least one general purpose microprocessor (eg, central processing unit (CPU)), at least one application specific integrated circuit (ASIC), and at least one field programmable gate array (FPGA). , Or any combination thereof. The memory 37 includes any type of magnetic medium such as a hard disk, any type of optical medium such as a CD and DVD, any type of semiconductor memory such as a volatile memory, and a non-volatile memory. The volatile memory may include DRAM and SRAM, and the non-volatile memory may include ROM and NVRAM.

As shown, the processor 43 is operably linked to the I / O interface 41. The I / O interface 41 communicates with, for example, a vehicle ECU 901 or another electronic device (reference numerals 903 to 919 described later) provided in the vehicle according to a CAN (Controller Area Network) standard (also referred to as CAN communication). ). The communication standard adopted by the I / O interface 41 is not limited to CAN, and is, for example, CANFD (CAN with Flexible Data Rate), LIN (Local Interconnect Network), Ethernet (registered trademark), MOST (Media Oriented Systems Transport). : MOST is a registered trademark), a wired communication interface such as UART, or USB, or a local such as a personal area network (PAN) such as a Bluetooth (registered trademark) network, or an 802.1x Wi-Fi (registered trademark) network. In-vehicle communication (internal communication) interface, which is a short-range wireless communication interface within several tens of meters such as an area network (LAN), is included. In addition, the I / O interface 41 is a wireless wide area network (WWAN0, IEEE 802.16-2004 (WiMAX: Worldwide Interoperability for Microwave Access)), IEEE 802.16e base (Mobile WiMAX), 4G, 4G-LTE, LTE Advanced, An external communication (external communication) interface such as a wide area communication network (for example, an Internet communication network) may be included according to a cellular communication standard such as 5G.

As shown in the figure, the processor 43 is interoperably connected to the I / O interface 41 to provide information with various other electronic devices and the like connected to the head-up display system 10 (I / O interface 41). Can be exchanged. The I / O interface 41 includes, for example, a vehicle ECU 901, a road information database 903, a vehicle position detection unit 905, an external sensor 907, an operation detection unit 909, an eye position detection unit 911, an IMU 913, a line-of-sight direction detection unit 915, and mobile information. The terminal 917, the external communication device 919, and the like are operably connected. The I / O interface 41 may include a function of processing (converting, calculating, analyzing) information received from another electronic device or the like connected to the head-up display system 10.

The display 21 is operably connected to the processor 43 and the image processing circuit 45. Therefore, the image displayed by the image display unit 20 may be based on the image data received from the processor 43 and / or the image processing circuit 45. The processor 43 and the image processing circuit 45 control the image displayed by the image display unit 20 based on the information acquired from the I / O interface 41.

The vehicle ECU 901 uses sensors and switches provided on the vehicle 1 to indicate the state of the vehicle 1 (for example, mileage, vehicle speed, accelerator pedal opening, brake pedal opening, engine throttle opening, injector fuel injection amount, engine rotation speed). , Motor speed, steering angle, shift position, drive mode, various warning states, attitude (including roll angle and / or pitching angle), vehicle vibration (including magnitude, frequency, and / or frequency of vibration) )) And the like, and collect and manage (may include control) the state of the vehicle 1. As a part of the function, the numerical value of the state of the vehicle 1 (for example, the vehicle speed of the vehicle 1). ) Can be output to the processor 43 of the display control device 40. The vehicle ECU 901 simply transmits the numerical value detected by the sensor or the like (for example, the pitching angle is 3 [brake] in the forward tilt direction) to the processor 43, or instead, the numerical value detected by the sensor is used. Judgment results based on one or more states of the including vehicle 1 (for example, the vehicle 1 satisfies a predetermined condition of the forward leaning state) and / and analysis results (for example, of the brake pedal opening degree). Combined with the information, the brake has caused the vehicle to lean forward.) May be transmitted to the processor 43. For example, the vehicle ECU 901 may output a signal indicating a determination result indicating a determination result in which the vehicle 1 satisfies a predetermined condition stored in advance in a memory (not shown) of the vehicle ECU 901 to the display control device 40. The I / O interface 41 may acquire the above-mentioned information from the sensors and switches provided in the vehicle 1 provided in the vehicle 1 without going through the vehicle ECU 901.

Further, the vehicle ECU 901 may output an instruction signal indicating an image to be displayed by the head-up display system 10 to the display control device 40, and at this time, it is necessary to notify the coordinates, size, type, display mode, and image of the image. The degree and / or the necessity-related information that is the basis for determining the notification necessity may be added to the instruction signal and transmitted.

The road information database 903 is included in a navigation device (not shown) provided in the vehicle 1 or an external server connected to the vehicle 1 via an external communication interface (I / O interface 41), and the vehicle position detection described later. Based on the position of the vehicle 1 acquired from the part 905, the road information (lane, white line, stop line, crosswalk, etc.) on which the vehicle 1 travels, which is the information around the vehicle 1 (information related to the actual object around the vehicle 1) Road width, number of lanes, intersections, curves, branch roads, traffic regulations, etc.), feature information (buildings, bridges, rivers, etc.), presence / absence, position (including distance to vehicle 1), direction, shape, type , Detailed information and the like may be read out and transmitted to the processor 43. Further, the road information database 903 may calculate an appropriate route (navigation information) from the departure point to the destination, and output a signal indicating the navigation information or image data indicating the route to the processor 43.

The own vehicle position detection unit 905 is a GNSS (Global Navigation Satellite System) or the like provided in the vehicle 1, detects the current position and orientation of the vehicle 1, and transmits a signal indicating the detection result via the processor 43. , Or directly output to the road information database 903, the portable information terminal 917 described later, and / or the external communication device 919. The road information database 903, the mobile information terminal 917 described later, and / or the external communication device 919 obtains the position information of the vehicle 1 from the own vehicle position detection unit 905 continuously, intermittently, or at a predetermined event. , Information around the vehicle 1 may be selected and generated and output to the processor 43.

The vehicle exterior sensor 907 detects real objects existing around the vehicle 1 (front, side, and rear). The actual objects detected by the external sensor 907 are, for example, obstacles (pedestrians, bicycles, motorcycles, other vehicles, etc.), road surfaces, lane markings, roadside objects, and / or features (buildings, etc.) of the traveling lane described later. Etc. may be included. As the vehicle exterior sensor, for example, a detection unit composed of a radar sensor such as a millimeter wave radar, an ultrasonic radar, a laser radar, a camera, or a combination thereof, and detection data from the one or a plurality of detection units are processed ( It consists of a processing device (data fusion) and a processing device. Conventional well-known methods are applied to object detection by these radar sensors and camera sensors. By object detection by these sensors, the presence or absence of a real object in the three-dimensional space, and if the real object exists, the position of the real object (relative distance from the vehicle 1 and the traveling direction of the vehicle 1 in the front-rear direction). (Horizontal position, vertical position, etc.), size (horizontal direction (horizontal direction), height direction (vertical direction), etc.), movement direction (horizontal direction (horizontal direction), depth) Direction (front-back direction)), movement speed (horizontal direction (left-right direction), depth direction (front-back direction)), and / or type may be detected. One or more external sensors 907 detect a real object in front of the vehicle 1 for each detection cycle of each sensor, and the real object information (presence or absence of a real object, existence of a real object exists) which is an example of the real object information. In this case, information such as the position, size, and / or type of each real object can be output to the processor 43. Note that these real object information may be transmitted to the processor 43 via another device (for example, vehicle ECU 901). Further, when using a camera as a sensor, an infrared camera or a near-infrared camera is desirable so that a real object can be detected even when the surroundings are dark such as at night. Further, when a camera is used as a sensor, a stereo camera capable of acquiring a distance or the like by parallax is desirable.

The operation detection unit 909 is, for example, a CID (Center Information Processor) of the vehicle 1, a hardware switch provided on the instrument panel, or a software switch that combines an image and a touch sensor, and the like. The operation information based on the operation by the occupant (the user seated in the driver's seat and / or the user seated in the passenger seat) is output to the processor 43. For example, the operation detection unit 909 has display area setting information based on the operation of moving the virtual image display area 100 by the user's operation, eye box setting information based on the operation of moving the eye box 200, and the observer's eye position 700 (FIG. Information based on the operation for setting (see 1) is output to the processor 43.

The eye position detection unit 911 may include a camera such as an infrared camera that detects the eye position 700 of the observer sitting in the driver's seat of the vehicle 1, and may output the captured image to the processor 43. The processor 43 acquires an captured image (an example of information capable of estimating the eye position 700) from the eye position detection unit 911, and analyzes the captured image by a method such as pattern matching to obtain an observer's eye position. The coordinates of 700 may be detected, and a signal indicating the detected coordinates of the eye position 700 may be output to the processor 43.

Further, the eye position detection unit 911 is a spatial region corresponding to an analysis result obtained by analyzing an image captured by the camera (for example, the observer's eye position 700 corresponds to a plurality of preset polarization patterns 600 (described later)). A signal indicating where it belongs to) may be output to the processor 43. The method of acquiring information capable of estimating the eye position 700 of the observer of the vehicle 1 or the eye position 700 of the observer is not limited to these, and a known eye position detection (estimation) technique is used. May be obtained.

Further, the eye position detection unit 911 detects the moving speed and / or moving direction of the observer's eye position 700, and outputs a signal indicating the moving speed and / or moving direction of the observer's eye position 700 to the processor 43. It may be output to.

The IMU 913 is a sensor (eg, accelerometer and gyroscope) configured to detect the position, orientation, and changes (speed of change, acceleration of change) of vehicle 1 based on inertial acceleration. Can include combinations of. The IMU 913 analyzes the detected values (the detected values include the position and orientation of the vehicle 1, signals indicating these changes (change speed, change acceleration), and the like), and the detected values are analyzed by the processor. It may be output to 43. The result of the analysis is a signal or the like indicating a determination result of whether or not the detected value satisfies a predetermined condition, and is, for example, from a value relating to a change (change speed, change acceleration) of the position or orientation of the vehicle 1. , It may be a signal indicating that the behavior (vibration) of the vehicle 1 is small.

The line-of-sight direction detection unit 915 may include an infrared camera or a visible light camera that captures the face of an observer sitting in the driver's seat of the vehicle 1, and may output the captured image to the processor 43. The processor 43 acquires an captured image (an example of information capable of estimating the line-of-sight direction) from the line-of-sight direction detection unit 915, and analyzes the captured image to determine the line-of-sight direction (and / or the gaze position) of the observer. Can be identified. The line-of-sight direction detection unit 915 may analyze the captured image from the camera and output a signal indicating the line-of-sight direction (and / or the gaze position) of the observer, which is the analysis result, to the processor 43. The method for acquiring information that can estimate the line-of-sight direction of the observer of the vehicle 1 is not limited to these, and is not limited to these, but is an EOG (Electro-ocular camera) method, a corneal reflex method, a scleral reflex method, and a Purkinje image detection. It may be obtained using other known line-of-sight detection (estimation) techniques such as the method, search coil method, infrared fundus camera method.

The personal digital assistant 917 is a smartphone, a laptop computer, a smart watch, or other information device that can be carried by an observer (or another occupant of vehicle 1). The I / O interface 41 can communicate with the mobile information terminal 917 by pairing with the mobile information terminal 917, and the data recorded in the mobile information terminal 917 (or the server through the mobile information terminal). To get. The mobile information terminal 917 has, for example, the same functions as the above-mentioned road information database 903 and own vehicle position detection unit 905, acquires the road information (an example of real object-related information), and transmits it to the processor 43. You may. Further, the personal digital assistant 917 may acquire commercial information (an example of information related to a real object) related to a commercial facility in the vicinity of the vehicle 1 and transmit it to the processor 43. The mobile information terminal 917 transmits schedule information of the owner (for example, an observer) of the mobile information terminal 917, incoming information on the mobile information terminal 917, mail reception information, and the like to the processor 43, and the processor 43 and an image. The processing circuit 45 may generate and / or transmit image data relating to these.

The external communication device 919 is a communication device that exchanges information with the vehicle 1, for example, another vehicle connected to the vehicle 1 by vehicle-to-vehicle communication (V2V: Vehicle To Vehicle), and pedestrian-to-vehicle communication (V2P: Vehicle To Pedestrian). ), A network communication device connected by a pedestrian (a mobile information terminal carried by a pedestrian) and a vehicle-to-vehicle communication (V2I), and in a broad sense, communication with a vehicle 1 (V2X). : Includes everything connected by (Vehicle To Everything). The external communication device 919 acquires, for example, the positions of pedestrians, bicycles, motorcycles, other vehicles (preceding vehicles, etc.), road surfaces, lane markings, roadside objects, and / or features (buildings, etc.) and sends them to the processor 43. It may be output. Further, the external communication device 919 has the same function as the own vehicle position detection unit 905 described above, and may acquire the position information of the vehicle 1 and transmit it to the processor 43, and further, the road information database 903 described above may be used. It also has a function, and the road information (an example of information related to a real object) may be acquired and transmitted to the processor 43. The information acquired from the external communication device 919 is not limited to the above.

The software components stored in the memory 37 include an eye position detection module 802, an eye position estimation module 804, an eye position prediction module 806, and a polarization pattern control module 808.

FIG. 4 is a flow chart showing a method S100 for performing an operation of setting a polarization pattern based on an observer's eye position according to some embodiments. Method S100 is executed by an image display unit 20 including a display and a display control device 40 that controls the image display unit 20.

The eye position detection module 802 of FIG. 3 detects the eye position 700 of the observer (S110). The eye position detection module 802 detects coordinates indicating the height of the observer's eyes (a position in the Y-axis direction, which is an example of a signal indicating the eye position 700) (an example of S112), and observes. Detecting coordinates indicating the height and depth of a person's eyes (positions in the Y and Z axes, which is an example of a signal indicating eye position 700) (an example of S112), and / Alternatively, various aspects related to detecting coordinates indicating the observer's eye position 700 (positions in the X, Y, Z-axis directions, which is an example of a signal indicating the eye position 700) (an example of S112). Includes various software components to perform various operations.

The eye position 700 detected by the eye position detection module 802 is one of the right eye position 700R and 700L, the right eye position 700R and the left eye position 700L, respectively, the right eye position 700R and the left eye position 700L. It includes one of the detectable (easy-to-detect) positions, or a position calculated from the right eye position 700R and the left eye position 700L (for example, the midpoint between the right eye position and the left eye position). For example, the eye position detection module 802 determines the eye position 700 based on the observation position acquired from the eye position detection unit 911 immediately before the timing of updating the display setting.

Further, the eye position detection unit 911 detects the movement direction and / or the movement speed of the observer's eye position 700 based on the observation positions of the eyes of a plurality of observers acquired from the eye position detection unit 911, and observer. A signal indicating the moving direction and / or moving speed of the eye position 700 may be output to the processor 43.

The eye position estimation module 804 acquires information capable of estimating the eye position (S114). Information that can estimate the eye position is, for example, an image captured from the eye position detection unit 911, the position of the driver's seat of the vehicle 1, the position of the observer's face, the height of the sitting height, or the eyes of a plurality of observers. Observation position, etc. The eye position estimation module 804 estimates the eye position 700 of the observer of the vehicle 1 from the information capable of estimating the eye position. The eye position estimation module 804 is based on an image captured from the eye position detection unit 911, the position of the driver's seat of the vehicle 1, the position of the observer's face, the height of the sitting height, the observation positions of the eyes of a plurality of observers, and the like. Includes various software components for performing various actions related to estimating the observer's eye position 700, such as estimating the observer's eye position 700. That is, the eye position estimation module 804 may include table data, an arithmetic expression, and the like for estimating the eye position 700 of the observer from the information capable of estimating the eye position.

The eye position detection module 802 sets the eye position 700 into an eye observation position acquired from the eye position detection unit 911 immediately before the timing of updating the polarization pattern and one or more eye observation positions acquired in the past. Based on this, it may be calculated by, for example, a method such as a weighted average.

The eye position prediction module 806 acquires information that can predict the eye position 700 of the observer (S116). The information that can predict the eye position 700 of the observer is, for example, the latest observation position acquired from the eye position detection unit 911, or one or more observation positions acquired in the past. The eye position prediction module 806 includes various software components for performing various actions related to predicting the eye position 700 based on predictable information about the observer's eye position 700. Specifically, for example, the eye position prediction module 806 predicts the observer's eye position 700 at the timing when the image to which the new display setting is applied is visually recognized by the observer. The eye position prediction module 806 uses a prediction algorithm such as the least squares method, a Kalman filter, an α-β filter, or a particle filter to obtain the next value using one or more observation positions in the past. You may try to predict.
It may include table data for specifying 00, an arithmetic expression, and the like.

The polarization pattern control module 808 selects one or more polarization patterns 600 corresponding to the eye positions 700 (S130). When the eye position 700 includes, for example, the right eye position 700R and the left eye position 700L, the polarization pattern control module 808 includes a polarization pattern 600 corresponding to the right eye position 700R, a polarization pattern 600 corresponding to the left eye position 700L, and a polarization pattern 600. Two can be selected. On the other hand, the eye position 700 is, for example, one of the predetermined positions of the right eye position 700R and the left eye position 700L, and one of the right eye position 700R and the left eye position 700L that can be detected (easily detected), or When there is one position calculated from the right eye position 700R and the left eye position 700L (for example, the midpoint between the right eye position 700R and the left eye position 700L), the polarization pattern control module 808 has one polarization corresponding to the eye position 700. Pattern 600 can be selected.

That is, in some embodiments, the display 21 can display an image for the right eye and an image for the left eye in a time-divided manner, and the processor 43 displays the image for the right eye on the display 21. At this time, the polarization pattern 600 of the polarization control element 50 may be changed for the right eye, while the polarization pattern 600 of the polarization control element 50 may be changed for the left eye when the display 21 displays an image for the left eye.

Further, in some embodiments, the display 21 can display the image for the right eye and the image for the left eye by spatial division, that is, the pixels for the right eye and the pixels for the right eye are individually displayed. In the region of the polarization control element 50 corresponding to the pixel displaying the image for the right eye in the display 21, the processor 43 makes the polarization pattern 600 for the right eye, while the display 21 In the region of the polarization control element 50 corresponding to the pixel displaying the image for the left eye, the polarization pattern 600 may be used for the left eye.

5A, 5B, and 5C are diagrams that virtually show the arrangement of a plurality of polarization patterns 600 associated with the eyebox 200 and the space around the eyebox 200. One polarization pattern 600 is associated with a region defined by two-dimensional coordinates consisting of X-axis coordinates in the left-right direction and Y-axis coordinates in the up-down direction when the vehicle 1 faces the forward direction. There is. That is, within the same section, the same one polarization pattern 600 is applied regardless of the coordinates of the eye position 700. In some embodiments, one polarization pattern 600 may be associated with three-dimensional coordinates including Z-axis coordinates. The plurality of polarization patterns 600 include a first polarization pattern 610 associated with the space inside the eyebox 200 where the image can be visually recognized, and a second polarization pattern 650 associated with the space outside the eyebox 200. (The second polarization pattern 650 may be omitted.)

It should be noted that FIGS. 5A, 5B and 5C are shown mainly to provide an explanation of the spatial arrangement corresponding to the polarization pattern 600, and the spatial region (section) corresponding to the second polarization pattern 650. ) Is conceptually shown. That is, the spatial region corresponding to the second polarization pattern 650 may be further expanded to the outside or reduced to the inside (eye box 200 side).

Refer to the upper figure of FIG. 5A. The first polarization pattern 610 is composed of 25 first polarization patterns 611 to 635, which are partitioned by 5 columns in the left-right direction (X-axis direction) and 5 rows in the up-down direction (Y-axis direction). In FIG. 5A, the columns are in the order of the first column, the second column, ... The fifth column from the positive direction (left) of the X axis, and the rows are the first row from the positive direction (top) of the Y axis. The second row, ... The fifth row, and the first polarization patterns 611 to 615 are arranged in the order of the first to fifth rows of the first column, and the first to fifth rows of the second column. 616 to 620 are arranged in the order of the eyes.

Next, refer to FIG. 5B. FIG. 5B provides a description of a modified example of the arrangement of the polarization pattern 600. The first polarization pattern 610 is composed of five first polarization patterns 641 to 645, which are partitioned in five rows in the left-right direction (X-axis direction) and not in the up-down direction (Y-axis direction). In FIG. 5B, the columns are in the order of the first column, the second column, ... The fifth column from the positive direction (left) of the X axis, and the first polarization pattern 641 to the fifth column is in order. 645 is placed. That is, the arrangement of the polarization pattern 600 in the eye box 200 is not a two-dimensional arrangement in which a plurality of determination areas are arranged in the X-axis direction and a plurality of determination areas are also arranged in the Y-axis direction, as shown in FIG. 5A. As shown in FIG. 5B, a one-dimensional arrangement may be adopted in which a plurality of determination areas are arranged in the X-axis direction and a plurality of determination areas are not arranged in the Y-axis direction.

Next, refer to FIG. 5C. FIG. 5C provides a description of a modified example of the arrangement of the polarization pattern 600. In FIGS. 5A and 5B, the size of the compartment to which one polarization pattern 600 arranged in the eye box 200 is associated is the same, but may be different as shown in FIG. 5C. Further, the shapes of the sections to which the plurality of one polarization patterns 600 are associated may also be different.

An arrangement example of the polarization control element 50 will be described below.

(First Embodiment)
FIG. 6 provides a description of the configuration of the display in the HUD device of the first embodiment. The display shown in FIG. 6 has a liquid crystal display panel.

The liquid crystal display panel 400 (an example of the display 21) comprises a pair of linear polarizing films 411 and 412 arranged so that their absorption axes are orthogonal to each other, a liquid crystal cell 410 arranged between them, and a light source 420. Have. Optical compensation films (not shown) are arranged between the linear polarizing films 411 and 412 and the liquid crystal cell 410, respectively, and contribute to the viewing angle compensation of the liquid crystal cell 410. Depending on the liquid crystal drive mode of the liquid crystal cell 410, the optical compensation film is unnecessary and may be replaced with a protective film for protecting the polarizing films 411 and 412, for example. Further, two or more optical compensation films may be arranged depending on the liquid crystal drive mode of the liquid crystal cell 410.

The liquid crystal drive mode of the liquid crystal cell 410 is not particularly limited, and is TN (Twisted Nematic), IPS (In-Plane Switching), FLC (Ferroelectric Liquid Crystal), AFLC (Anti-ferroelectric Liquid Crystal), and OLC (Anti-ferroelectric Liquid Crystal). , STN (Super Twisted Nematic), VA (Virtually Aligned), HAN (Hybrid Aligned Nematic), and the like.

The polarization control element 50 is arranged on the surface of the linear polarizing film 411, that is, the surface on the observer side. The linearly polarized image incident from the liquid crystal display panel 400 passes through the polarization control element 50 and is emitted as a patterned polarized image having a different polarization axis E for each region. The patterned polarized image is projected onto the projected member 60 and reflected toward the eyebox 200 in a plurality of partial regions W (see FIG. 10) of the projected member 60. The polarization axis E for each region of the patterned polarized image so that each light reflected by the partial region W of the projected member 60 and directed toward the eye position of the observer is incident on the partial region W of the projected member 60 with P polarization. The orientation of is adjusted. That is, the polarization control element 50 sets the direction of the polarization axis E for each region of the patterned polarized image so that the electric field component of the light of the patterned polarized image is perpendicular to the reflecting surface (each region W of the windshield). adjust. The rotation angle of the polarization axis E rotated by the polarization control element 50 is set to, for example, −5 to +5 [degree] (in other words, the variation in the direction of the polarization axis E in the plane of the polarization control element 50 is Less than 10 degrees).

(Second Embodiment)
FIG. 7 provides a description of the configuration of the display in the HUD device of the second embodiment. The display shown in FIG. 7 is an embodiment having a laser scanning display panel.

The laser scanning display panel 500 (an example of the display 21) includes a laser module 510, a scanner 520 including a MEMS (Micro Electro Mechanical System) mirror, and a screen 530 (an example of a display surface 30). The scanner 520 displays a two-dimensional display image on the screen 530 by scanning the laser beam 570 time-dividedly modulated from the laser module 510 toward the screen 530 in two dimensions.

The folded mirror 560 is arranged on the optical path of the laser beam 570 emitted from the laser module 510, and reflects the laser beam 570 to the scanner 520. The folded mirror 560 may be omitted.

The polarization control element 50 is arranged on the surface of the screen 530, that is, the surface on the observer side. The polarization control element 50 is the same as that of the first embodiment, and the description thereof will be omitted.

(Third Embodiment)
FIG. 8 provides a description of the configuration of the display in the HUD device of the third embodiment. The display shown in FIG. 8 has a liquid crystal display panel.

The liquid crystal display panel 400 (an example of the display 21) includes a linear polarizing film 412, a liquid crystal cell 410 arranged on the surface side thereof, and a light source 420.

The polarization control element 50 is arranged on the surface of the liquid crystal cell 410, that is, the surface on the observer side. When the linearly polarized image incident from the liquid crystal display panel 400 is incident on the polarization control element 50, it is emitted as a patterned polarized image having a different polarization axis E for each region. The polarization axis E of the patterning polarized image emitted from the polarization control element 50 is 80 to 100 [degree] or 260 to 280 [degree] (preferably) with respect to the transmission axis of the linear polarizing film 412 of the liquid crystal display panel 400. , 85-95 [degree], or 265-275 [degree]).

The patterned polarized image adjusted by the polarization control element 50 described above so that the orientation of the polarization axis E is different for each region is projected onto the projected member 60, and the plurality of partial regions W of the projected member 60 (see FIG. 10). ) Is reflected toward the eye box 200. Each light reflected by the partial region W of the projected member 60 and directed to a predetermined position (observer's eye position 700) in the eye box 200 is incident on the partial region W of the projected member 60 with P-polarized light. The orientation of the polarization axis E for each region of the patterned polarized image is adjusted. That is, the polarization control element 50 sets the orientation of the polarization axis E for each region of the patterned polarized image so that the electric field component of the light of the patterned polarized image is perpendicular to the reflecting surface (each region W of the windshield). Adjust (adjust the polarization pattern 600).

FIG. 9 shows an observer facing the front of the vehicle 1 with the polarization axis E of the display light 20a incident on the projected member 60 (the observer has his / her eyes arranged at the center 205 of the eye box 200. It is a conceptual diagram seen from.). FIG. 10 shows the main part of FIG. 9 (the main part is a part of the projected member 2 that overlaps with the virtual image display area 100 when viewed from the observer who placed the eyes at the center 205 of the eye box 200). It is an enlarged view and is the figure which shows the polarization axis E of the display light 20a which is incident in every part area W of the projected member 60. In FIG. 10, the projected member 60 is provided with seven partial regions W11 to W17 partitioned by a vertical (vertical direction) boundary line, and each partial region W11 to W17 having a vertically long rectangular outer shape is formed. They are arranged (arranged) adjacent to each other from left to right. The HUD device 20 projects display light 20a of a patterned polarized image having a different polarization axis E for each of these partial regions W11 to W17. That is, display light 20a having a polarization pattern 600 including different polarization axes E11, E12, ... E17 is projected on the partial regions W11, W12, ... W17.

A specific partial region WA (the specific partial region is shown in FIG. 10) between the left-right ends of the partial region W (the left-right ends of the partial region W are W11 and W17 in FIG. 10). In 10, the reference polarization axis EA of the display light 20a reflected by W14 (the reference polarization axis EA is E14 in FIG. 10) is the angle formed by the most vertical direction (Y-axis direction). Becomes smaller (preferably parallel).

The polarization axis E (second polarization axis E2) gradually tilts clockwise from a direction substantially parallel to the vertical direction toward the right side of the specific partial region WA. That is, in the example of FIG. 10, the polarization axis E15 in the partial region W15, the polarization axis E16 in the partial region W16, and the polarization axis E17 in the partial region W17 are in this order substantially parallel to the vertical direction (reference polarization axis). Gradually tilt clockwise from (EA direction).

Further, the polarization axis E (first polarization axis E1) gradually tilts counterclockwise from a direction substantially parallel to the vertical direction toward the left side of the specific partial region WA. That is, in the example of FIG. 10, the polarization axis E13 in the partial region W13, the polarization axis E12 in the partial region W12, and the polarization axis E11 in the partial region W11 are in this order substantially parallel to the vertical direction (reference polarization axis). Gradually tilt counterclockwise from (EA direction).

That is, in the first aspect of the polarization control element 50, it has three or more polarization regions that change the direction of the polarization axis E stepwise. (The three polarization regions are (1) a region for setting the reference polarization axis EA projected on the specific partial region WA, and (2) a partial region W on the right side of the specific partial region WA when viewed from the observer. Projected onto the region where the polarization axis E is set with the reference polarization axis EA tilted clockwise, and (3) the reference polarization axis EA is projected counterclockwise to the partial region W on the left side of the specific partial region WA. Includes a region for setting the polarization axis E tilted toward.

The polarization control element 50 in some embodiments is not particularly limited because the number of polarization regions in which the orientation of the polarization axis E is stepwise different differs depending on how the polarization regions are divided, but may be 3 to 2000. Preferred (7 in the example of FIG. 10). That is, the HUD device 20 can adjust the polarization axis E of the display light 20a incident on each partial region W of the projected member 2.

Further, the polarization control elements 50 in some embodiments are arranged so as to adjust the polarization axes E of the display light 20a incident on each partial region W arranged along the left-right direction as seen from the observer. It has a polarization region of. According to this, the HUD device 20 can appropriately adjust the polarization axis E in the left-right direction in which the direction of the polarization axis E of the display light 20a with respect to the projected member 2 is likely to change.

Further, in the polarization control element 50 in some embodiments, a plurality of partial regions W arranged along the left-right direction as seen by the observer are arranged so as to be partitioned by a boundary line parallel to the vertical direction. It has a polarized region. According to this, it is possible to suppress the variation in the orientation of the polarization axis E of the display light 20a with respect to the projected member 2 in one partial region W.

The partial regions W arranged along the left-right direction as seen from the observer do not have to be divided by the boundary lines parallel to the vertical direction, that is, the boundaries of the plurality of partial regions W as shown in FIG. The lines may be arranged diagonally with respect to the vertical direction. The boundary line of the plurality of partial regions W may be a curved line instead of a straight line.

Further, the polarization control element 50 in some embodiments is arranged so that the width D along the left-right direction seen from the observer of the plurality of partial regions W is partitioned so as to be non-uniform. It may have a polarized region.

Specifically, for example, as shown in FIG. 12, the polarization control element 50 maximizes the width D4 of the partial region W14 on the left-right side of the virtual image display region 100 in the left-right direction, and maximizes the width D4 of the virtual image display region 100 in the left-right direction. It has a plurality of polarization regions arranged so that the width gradually narrows toward the side (D4> D3> D2> D1, D4> D5> D6> D7). That is, the polarization control element 50 has an orientation of the polarization axis E according to the position of the projected member 60 in the left-right direction in the vicinity of a specific partial region WA in which the reference polarization axis EA having the most vertical orientation is incident. The polarization pattern 600 may be changed stepwise so that the rate of change of is gentle. According to this, it is possible to suppress the variation in the orientation of the polarization axis E of the display light 20a with respect to the projected member 2 in one partial region W.

In some embodiments, the partial region W having the maximum width D in the left-right direction may be the specific partial region WA described above. According to this, it is possible to suppress the variation in the orientation of the polarization axis E of the display light 20a with respect to the projected member 2 in one partial region W while suppressing the increase in the number of the partial regions W.

Further, the polarization control element 50 of the first aspect has, but is not limited to, three or more polarization regions that change the direction of the polarization axis E stepwise. The polarization control element 50 of the second aspect may continuously change the orientation of the polarization axis E.

FIG. 13 is a diagram providing an explanation of a first aspect P10 in which the orientation of the polarization axis with respect to the position of the projected member is changed stepwise, and a second aspect P20 (P21, P22) in which the orientation is continuously changed. , It is a figure which shows the direction (vertical axis) of the polarization axis with respect to the position (horizontal axis) in the left-right direction of the projected member. The polarization control element 50 of the first aspect changes the polarization axis E stepwise for each of the partial regions W11 to W17 of the projected member 2. On the other hand, the polarization control element 50 of the second aspect continuously changes the polarization axis E according to the position of the projected member 2 in the left-right direction. The polarization control element 50 of the second aspect may maintain and change the rate of change of the polarization axis E according to the position of the projected member 2 in the left-right direction (aspect P21), and may change the rate of change of the polarization axis E. It may be changed dynamically (Aspect P22).

In some embodiments of the embodiment in which the rate of change of the polarization axis E is dynamically changed, as in the embodiment P22 shown in FIG. 13, the polarization control element 50 has a reference polarization having an orientation along the most vertical direction. Even if the polarization pattern is continuously changed so that the rate of change in the orientation of the polarization axis E according to the position of the projected member 60 in the left-right direction becomes gentle in the vicinity of the specific partial region WA where the axis EA is incident. good.

Further, in some embodiments, the polarization control element 50 is not arranged on the display surface 30 of the display 21, but is the surface of the relay optics 25, the light of the display light 20a up to the display 21 and the relay optics 25. It may be arranged on the road or on the optical path of the display light 20a among the plurality of relay optics 25.

The present invention is not limited to these embodiments, and embodiments configured by appropriately combining the configurations of the respective embodiments are also within the scope of the present invention.

1: Vehicle 2: Projected member 10: Head-up display system 20: Image display unit (head-up display device)
20a: Display light 21: Display 21a: Display light 25: Relay optics 26: First mirror 28: Second mirror 30: Display surface 37: Memory 40: Display control device 41: I / O interface 43: Processor 45 : Image processing circuit 50: Polarization control element 60: Projected member 80: Reflective diffraction element 100: Virtual image display area 200: Eye box 205: Center 400: Liquid crystal display panel 410: Liquid crystal cell 411: Linear polarizing film 412: Linear polarized light Film 420: Light source 500: Laser scanning display panel 510: Laser module 520: Scanner 530: Screen 560: Folded mirror 570: Laser beam 600: Polarization pattern 610: First polarization pattern 650: Second polarization pattern 700: Eye position 700L : Left eye position 700R: Right eye position 802: Eye position detection module 804: Eye position estimation module 806: Eye position prediction module 808: Polarization pattern control module 901: Vehicle ECU
903: Road information database 905: Own vehicle position detection unit 907: External sensor 909: Operation detection unit 911: Eye position detection unit 915: Line-of-sight direction detection unit 917: Mobile information terminal 919: External communication device E2: Second polarization axis EA: Reference polarization axis V: Virtual image W: Partial region

Claims (11)

A head-up display device (20) that allows an observer who places his / her eyes on the eye box (200) to visually recognize a virtual image by projecting display light onto the projected member (60).
The display (21) that emits the display light and
Relay optics (25) that directs the display light from the display (21) toward the projected member (60).
A polarization control element (50) arranged on the optical path of the display light from the display (21) and adjusting the direction of the polarization axis (E) of the display light for each region in which the display light is incident.
One or more I / O interfaces (41) from which information can be obtained,
With one or more processors (43),
Memory (47) and
It comprises one or more computer programs stored in the memory (47) and configured to be executed by the one or more processors (43).
The I / O interface (41) acquires information indicating the eye position of the observer or information capable of estimating the eye position.
The one or more processors (43)
Based on the eye position, polarization pattern control for differentiating the orientation of the polarization axis (E) is executed for each region of the polarization control element (50) so that surface reflection by the projected member (60) is reduced. do,
Head-up display device (20). The one or more processors (43)
The direction of the polarization axis (E) of the display light reflected toward the eye position in each region of the projected member (60) is the incident light of P-polarized light in each region of the projected member (60). The polarization pattern control is executed so as to approach.
The head-up display device (20) according to claim 1. The one or more processors (43)
The polarization control element (50) is controlled so that the variation in the direction of the polarization axis (E) in the plane of the polarization control element (50) is less than 10 degrees.
The head-up display device (20) according to claim 1. The one or more processors (43) continuously orientate the polarization axis (E) of the indicator light along at least the left-right direction as seen by the observer who places his eyes on the eyebox (200). Performing the polarization pattern control so as to be different,
The head-up display device (20) according to claim 1. The one or more processors (43) stepwise orient the polarization axis (E) of the indicator light along at least the left-right direction as seen by the observer arranging the eyes in the eyebox (200). Performing the polarization pattern control so as to be different,
The head-up display device (20) according to claim 1. In the one or more processors (43), the orientation of the polarization axis (E) of the display light incident on the projected member (60) is viewed from an observer who places an eye on the eyebox (200). hand,
The first polarization axis (E1), which is an orientation that is less than 90 degrees counterclockwise,
The second polarization axis (E2), which is an orientation that is less than 90 degrees clockwise,
The polarization pattern control is executed so that the orientation of the polarization axis (E) of the display light is continuously or stepwise different so as to include.
The head-up display device (20) according to claim 1. The display light having the first polarization axis (E1) is more said than the display light having the second polarization axis (E2) when viewed from an observer who places an eye on the eyebox (200). Projected to the left side of the projected member (60),
The head-up display device (20) according to claim 6. The polarization patterning optical member (50) is positioned in the left-right direction of the projected member (60) in the vicinity of a specific partial region (WA) where the polarization axis (EA) having the most vertical orientation is incident. The orientation of the polarization axis (E) of the display light is continuously or stepwise different so that the rate of change of the orientation of the polarization axis (E) according to the above is gentle.
The head-up display device (20) according to claim 3 or 4. A head-up display system (10) that allows an observer who places his eyes in the eye box (200) to visually recognize a virtual image.
A projected member (60) having a reflective diffraction element (80) and
The display (21) that emits the display light and
Relay optics (25) that directs the display light from the display (21) toward the projected member (60).
A polarization control element (50) arranged on the optical path of the display light from the display (21) and adjusting the direction of the polarization axis (E) of the display light for each region in which the display light is incident.
One or more I / O interfaces (41) from which information can be obtained,
With one or more processors (43),
Memory (47) and
It comprises one or more computer programs stored in the memory (47) and configured to be executed by the one or more processors (43).
The I / O interface (41) acquires information indicating the eye position of the observer or information capable of estimating the eye position.
The one or more processors (43)
Based on the eye position, polarization pattern control for differentiating the orientation of the polarization axis (E) is executed for each region of the polarization control element (50) so that surface reflection by the projected member (60) is reduced. do,
Head-up display system (10). The reflective diffraction element (80) includes at least one of a holographic element and a diffraction optical element (DOE).
The head-up display system (10) according to claim 9. The relay optics (25) projects the display light at an angle of incidence on the projected member (60) near the Brewster's angle.
The head-up display system (10) according to claim 9.

Images