WO2019163655A1

WO2019163655A1 - Headup display

Info

Publication number: WO2019163655A1
Application number: PCT/JP2019/005484
Authority: WO
Inventors: さやか水野
Original assignee: 日本精機株式会社
Priority date: 2018-02-23
Filing date: 2019-02-15
Publication date: 2019-08-29

Abstract

Provided is a headup display that is equipped with a detection means having a small power consumption. This headup display is characterized by being provided with: a display 20 that generates a display image; a reflecting section 41 that reflects the display image transmitted from the display 20; a drive means 43 that changes the reflecting direction of the reflecting section 41; a detection means 44, which has a light source 44a, and which detects the reference position of the reflecting section 41, said reference position being changed by means of the drive means 43 in accordance with the reception state of light emitted from the light source 44a; and a control means 60 that controls operations of the drive means 43 and the detection means 44.

Description

Head-up display

The present disclosure relates to a head-up display, and is particularly suitable for a vehicle head-up display that can change the projection direction.

As a conventional head-up display, the position of the reflecting means that reflects the display light to the projection member is moved to a position where sunlight does not enter the display in the housing through the reflecting means in a stop state where the device is not used. In the operating state, it is configured to return from the position of the stopped state, and in the situation where the head-up display is not used, the sun light is incident on the display in the housing through the reflecting means to reduce the possibility of deterioration. For example, it is disclosed in Patent Document 1.

In addition, there is a configuration that provides an optimum display position (projection position) for each user by adjusting the position of the reflection means, for example, a photo for detecting the adjustment motor and the reference position of the reflection member. A device using an interrupter is disclosed (for example, disclosed in Patent Document 2).

JP 2005-208436 A Japanese Patent Laid-Open No. 2015-59968

As described above, in the configuration in which the reference position of the reflecting member is detected using the photo interrupter, there is room for improvement in order to obtain a power saving configuration because electric power for detection is required.

Therefore, an object of the present disclosure is to provide a head-up display provided with detection means that consumes less power and focuses on the above-described problems.

The head-up display of the present invention includes a display that generates a display image, a reflection unit that reflects the display image from the display, a drive unit that changes the reflection direction of the reflection unit, and a light source. A detecting unit that detects a reference position of the reflecting portion that is fluctuated by the driving unit according to a light receiving state of light emitted from the light source; and a control unit that controls the operation of the driving unit and the detecting unit. It is characterized by.

The head-up display according to the present disclosure provides a head-up display including a detection unit with low power consumption.

1 is a schematic diagram of a vehicle equipped with a head-up display according to an embodiment of the present disclosure. Sectional drawing of the head-up display by the embodiment. FIG. 3A is a diagram illustrating a state where the detected portion is detected by the photosensor, and FIG. 3B is a diagram illustrating a state where the detected portion is not detected by the photosensor. The figure explaining detection operation by the photosensor by the embodiment. The block diagram which shows the structure in connection with the action | operation of the 2nd reflector by the embodiment. The circuit diagram which shows the connection structure of the photosensor by the embodiment.

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

As shown in FIG. 1, the head-up display is configured such that the display light L projected by the display device 12 that is a display unit disposed inside the instrument panel 11 of the vehicle 10 is the windshield 13 of the vehicle 10 that is a projection member. The virtual image V is displayed by reflecting in the direction of the driver (observer) 14. In other words, the head-up display emits display light L emitted from a liquid crystal display (to be described later) of the display device 12 to the windshield 13 (the projection member), and displays a display image (virtual image) V obtained by the emission. The driver 14 visually recognizes the driver. As a result, the driver 14 can observe the virtual image V superimposed on the landscape.

表示 As shown in FIG. 2, the display device 12 mainly includes a liquid crystal display 20, a first reflector 30, a second reflector 40, and a housing (housing) 50.

The liquid crystal display 20 has a light source 21 formed of a light emitting diode mounted on the wiring board R and a front side (directly above) the light source 21 so as to transmit the illumination light from the light source 21 and form the display light L. It is mainly composed of a TFT-type liquid crystal display element (display element) 22 positioned. This is because the light source 21 is disposed behind (directly below) the liquid crystal display element 22, and the display image generated by the liquid crystal display element 22 is generated by predetermined information (information to be displayed later) by light emitted from the light source 21. Is output as display light L for displaying.

The liquid crystal display 20 is provided in the housing 50 so that the surface on the emission side of the display light L faces a cold mirror (to be described later) of the first reflector 30, and the optical axis of the display light L is on the cold mirror. Fixed and held at a crossing position and orientation.

Further, the liquid crystal display element 22 emits and displays information (for example, the speed of the vehicle and the engine speed) to be displayed by an element driving circuit (not shown) by numerical values. The liquid crystal display 20 outputs display light L composed of light in the visible wavelength range. For example, a light source 21 that emits red light (mainly emission wavelength range of 610 to 640 nm) can be applied. Needless to say, the information to be displayed is not limited to the speed of the vehicle and the engine speed, and any display form can be adopted.

The first reflector 30 includes a cold mirror 31 and an attachment member 32 for attaching and fixing the cold mirror 31 using predetermined attachment means.

コール The cold mirror 31 includes a substantially rectangular glass substrate 31a and a first reflecting layer 31b formed on one surface of the glass substrate 31a (a surface facing a concave mirror described later of the second reflector 40). The first reflective layer 31b is composed of multilayer interference films having different film thicknesses, and is formed by a method such as vapor deposition. The cold mirror 31 is disposed in an inclined state at a position where the display light L emitted from the liquid crystal display 20 is reflected to the second reflector 40 (the concave mirror) side.

In the case of the present embodiment, the cold mirror 31 and the liquid crystal display 20 are arranged at a position where they cannot directly face a translucent cover (to be described later) of the housing 50, and light from outside such as sunlight (external light). Is a structure that does not directly hit. The attachment member 32 is made of, for example, a black synthetic resin material and is fixed to the housing 50.

As shown in FIGS. 2 to 4, the second reflector 40 includes a concave mirror (reflecting portion) 41 that is a reflective mirror that reflects the display light L from the cold mirror 31 (that is, the liquid crystal display element 22), and the concave mirror. And a position adjusting means (driving means) 43 for adjusting the angular position (arrangement position) of the holding member 42 (concave mirror 41).

凹 The concave mirror 41 is formed by depositing the second reflective layer 41a on a resin substrate having a concave surface. The concave mirror 41 is disposed in an inclined state at a position where the second reflective layer 41a faces the cold mirror 31 and the translucent cover and faces the translucent cover.

凹 Moreover, the concave mirror 41 reflects (projects) the display light L from the cold mirror 31 toward the translucent cover (the windshield 13 of the vehicle 10). This means that the concave mirror 41 enlarges the display light L reflected by the cold mirror 31 and projects the enlarged display light L onto the windshield 13 through the translucent cover.

保持 The holding member 42 is made of a synthetic resin material and includes a shaft portion (not shown) having a substantially cylindrical shape that is pivotally supported by a bearing portion (not shown) provided in the housing 50. In this case, the double-sided adhesive tape (not shown) is fixedly held between the concave mirror 41 and the holding member 42. Therefore, the holding member 42 and the concave mirror 41 held by the holding member 42 are configured to be pivotally supported so as to be movable (rotatable).

As shown in FIG. 3, the projecting piece 42 a is a projecting piece formed continuously from the holding member 42 and projecting in an arm shape from the side of the concave mirror 41, and the projecting piece 42 a is provided on the position adjusting means 43. The sandwiched contact portion 42b is integrally formed.

The position adjusting means 43 is provided with a stepping motor 43a, a rotating shaft 43b, a power transmission member 43c, and a photo sensor (detecting means) 44.

The stepping motor 43a generates a rotational driving force (driving force) for adjusting the arrangement position of the concave mirror 41, and the rotating shaft 43b is a screw groove formed in a spiral shape on the peripheral surface thereof. A lead screw is provided. The rotating shaft 43b is rotationally driven with the driving of the stepping motor 43a.

動力 The power transmission member 43c is made of a synthetic resin material such as polyacetal, and can move along the axial direction by the rotation of the rotating shaft 43b while sandwiching the contact portion 42b. By this movement, the position adjusting means 43 can rotate the second reflector 40.

As shown in FIGS. 3 and 4, the position adjusting means 43 has a plate-like detected part 43d that extends from the power transmission member 43c and moves together with the power transmission member 43c. The detected portion 43d is provided so as to be detectable by a photosensor (detection means) 44 provided on one end side of the rotating shaft 43b.

The photosensor 44 can be applied with a package component in which an IRLED (light source) 44a and a light receiving portion 44b disposed at a predetermined interval from the IRLED 44a are opposed to each other, and emits light emitted from the IRLED 44a, in this case, infrared light. The light can be converted into an electrical signal by the light receiving unit 44b. By detecting the switching of whether or not the detected portion 43d that shields light is interposed between the IRLED 44a and the light receiving portion 44b, the predetermined positions of the power transmission member 43c and the second reflector 40 can be determined by the control means described later. . Further, the control means can control the stepping motor 43a using the predetermined position (the position shown in FIG. 3A and the dotted line position in FIG. 4) as a reference position. In this case, the transmissive photosensor (photointerrupter) 44 is applied, but a configuration in which the detected portion 43d is detected by a reflective photosensor (photoreflector) can also be applied.

The housing 50 is formed of, for example, aluminum die casting or a hard resin material, and includes an upper case body 51 and a lower case body 52 both having a substantially concave shape in cross section, and the upper case body 51 and the lower case body 52 The liquid crystal display 20 (liquid crystal display element 22) and the

reflectors

30 and 40 are accommodated in the space portion 53 that is an internal space formed by (see FIG. 2). For this reason, it is possible to prevent exposure from the photosensor 44 to the driver side and external light from reaching the photosensor 44.

The upper case body 51 is formed with an opening window 51a that opens at the upper part (the windshield 13 side of the vehicle 10) where the concave mirror 41 is disposed. The opening window 51a includes an opening window 51a. A light-transmitting cover 54 that is a light-transmitting portion is disposed so as to close the cover.

The translucent cover 54 is made of a translucent synthetic resin material and has a function as a light transmissive member through which the display light L reflected by the concave mirror 41 is transmitted (passed). That is, the display light L reflected by the concave mirror 41 is projected onto the windshield 13 through the translucent cover 54 formed on the housing 50, whereby the virtual image V is displayed.

Next, the configuration relating to the detection of the detected part 43d by the photosensor 44 will be described with reference to FIGS.

The display device 12 includes a control means 60, a motor driver 70, a stepping motor 43a, and a photo sensor 44.

The control means 60 is provided with a storage unit such as a ROM or a RAM (not shown) used for storing a predetermined program and various data, a storage area at the time of calculation, a CPU for performing arithmetic processing according to the predetermined program, an input / output interface, and the like A microcomputer can be applied.

The control means 60 is connected to the start switch K of the vehicle 10 and is connected to various sensors of the vehicle, the electronic control unit E, and the operation means S provided in the instrument panel or the steering via a communication line. Ten kinds of information can be input. The control means 60 is connected to issue a control signal to the motor driver 70 and the liquid crystal display 20 (the liquid crystal display element 22 and the light source 21) based on a predetermined program.

モータ The motor driver 70 is a circuit that generates a drive signal for driving the stepping motor 43 a based on a control signal from the control means 60. Further, the motor driver 70 is provided with an input port 71 for inputting a signal (enable signal) indicating a drive permission state when the operation is permitted (when rotation is permitted) based on a control signal from the control means 60. The signal is also connected to a switch unit (transistor) 72 that switches the presence or absence of power supply from the power source B to the photosensor 44.

The stepping motor 43a rotates the rotating shaft 43b based on the signal indicating the drive permission state from the control means 60, and the position / orientation of the power transmission member 43c, that is, the second reflector 40 according to the rotation angle. To move.

The photosensor 44 includes an IRLED 44a and a light receiving unit 44b. The power supply B supplied based on a signal from the control means 60 performs light emission by the IRLED 44a and output of a detection signal by the light receiving unit 44b. To the control means 60. In this case, the power source B of the photosensor 44 uses a 3V power source obtained by stepping down the power from the in-vehicle battery using a regulator, and the presence / absence of power supply is switched via the switch unit 72.

With the above-described configuration, when the driver (user) 14 adjusts to a desired angle (display position) by the operation means S, for example, based on the start switch K, for example, when the stepping motor 43a is permitted to operate. Only when the power is supplied to the photosensor 44, the reference position can be detected. For this reason, during normal use in which the head-up display is displayed for traveling, the operation of the photosensor 44, in particular, the IRLED 44a does not emit light, so that unnecessary power consumption, deterioration of the light emitting element, and heat generation can be reduced.

In addition, since the control means 60 is connected to the liquid crystal display 20 so as to be controllable, the light source 21 is turned off when the photosensor 44 is operated (when the stepping motor 43a is operated), so that the display light L Eliminates degradation in reference position detection accuracy.

As described above, the head-up display includes the liquid crystal display 20 that generates a display image, the concave mirror 41 that reflects the display image from the liquid crystal display 20, the position adjusting unit 43 that varies the reflection direction of the concave mirror 41, and the IRLED 44a. And a photosensor 44 for detecting a reference position of the concave mirror 41 that is changed by the position adjusting means 43 according to the light receiving state of the light emitted from the IRLED 44a, and a control for controlling the operation of the position adjusting means 43 and the photosensor 44. And means 60.

In addition, the head-up display is characterized in that the photo sensor 44 further includes an IR LED 44a and a light receiving unit 44b that outputs an electric signal to the control means based on the light emitted from the IR LED 44a.

Further, the head-up display is characterized in that the control means 60 further controls the operation of the photosensor 44 by switching the presence or absence of power supply to the photosensor 44 via the position adjustment means 43.

Thereby, only when the driver (user) 14 adjusts to a desired angle (display position) by the operation means S, for example, by the operation means S, that is, when the stepping motor 43a permits the operation. The power supply to the photosensor 44 can be performed, and the reference position can be detected. For this reason, during normal use in which the head-up display is displayed for traveling, the operation of the photosensor 44, in particular, the IRLED 44a does not emit light, so that unnecessary power consumption, deterioration of the light emitting element, and heat generation can be reduced.

In the head-up display, the IR LED 44a emits infrared light, and the liquid crystal display 20, the position adjusting means 43, the photo sensor 44, and the control means 60 are accommodated in the same casing. And

Thereby, it is possible to prevent exposure of the light emitted from the IRLED 44a to the driver side and irradiation of the photosensor 44 with external light.

したがって Therefore, the head-up display of the present disclosure is a head-up display provided with detection means with low power consumption of the IRLED 44a.

Although the head-up display according to the present invention has been described by way of example in the configuration of the above-described embodiment, the present invention is not limited to this, and other configurations do not depart from the gist of the present invention. It goes without saying that various improvements in design, design changes, and part of the configuration can be omitted.

For example, the photo sensor 44 has been shown to detect the position of the second reflector 40 based on the position of the power transmission member 43c. However, the photo sensor 44 is configured to detect a part of the second reflector as a detected portion. Also good.

In the above-described embodiment, the signal from the control means 60 to the motor driver 70 is also used, and power is supplied to the photosensor 44 only when the operation of the stepping motor 43a is permitted, thereby detecting the reference position. However, it is also possible to provide a dedicated drive permission signal from the control means 60 to the photosensor 44. In this case, for example, even when the stepping motor 43a is not in operation, for example, by issuing the drive permission signal for a predetermined time after the start switch K is switched off / on, Detection and malfunction detection can also be performed.

In addition, in the above-described embodiment, the configuration in which the photo sensor 44 is mounted on the position adjusting unit 43 is shown. Thereby, since the structure interposed between the to-be-detected part 43d and the photosensor 44 in the supporting structure is as small as possible, the position detection accuracy of the to-be-detected part 43d by the photosensor 44 is improved. However, the photosensor 44 can be configured to be placed at an arbitrary location in the casing away from the position adjusting means 43. In this case, restrictions on the layout of each structure are relatively reduced, and the layout of other structures can be easily performed.

Further, in the above-described embodiment, the configuration in which the position of the power transmission member 43c is changed using the rotating shaft 43b and the angle of the concave mirror 41 is adjusted is shown. However, even if the rotating shaft 43b is not used. Good. For example, a configuration in which the power source is directly arranged on the rotating shaft of the concave mirror 41 may be employed.

The present disclosure relates to a head-up display, and is suitable, for example, as a vehicle display device mounted on a moving body including an automobile, a motorcycle, an agricultural machine, or a construction machine.

DESCRIPTION OF SYMBOLS 10 Vehicle 11 Instrument panel 12 Display apparatus 13 Windshield (projection member)
14 Driver (observer)
20 Liquid crystal display 21 Light source 22 Liquid crystal display element (display element)
30 First reflector 31 Cold mirror 40 Second reflector 41 Concave mirror (reflecting member)
42 holding member

42a protruding piece

42b contact portion 43 position adjusting means (driving means)
43a Stepping motor (drive member)
43b Rotating shaft 43c Power transmission member 43d Detected part 44 Transmission type photosensor (detection means)
44a IRLED (light source)
44b Light-receiving part 50 Housing (housing)
60 Control means 70 Motor driver 71 Input port 72 Switch part L Display light V Virtual image K Start switch S Operation means

Claims

A display for generating a display image;
A reflection part for reflecting the display image from the display;
Driving means for changing the reflection direction of the reflecting portion;
A detecting unit that has a light source and detects a reference position of the reflecting unit that varies by the driving unit according to a light receiving state of light emitted from the light source;
Control means for controlling the operation of the drive means and the detection means;
A head-up display comprising:
The head-up display according to claim 1, wherein the detection unit includes the light source and a light receiving unit that outputs an electric signal to the control unit based on light emitted from the light source.
The head-up display according to claim 1, wherein the control unit controls the operation of the detection unit by switching the presence or absence of power supply to the detection unit via the driving unit.
The light source emits infrared light;
4. The head-up display according to claim 1, wherein the display, the driving unit, and the detection unit are accommodated in the same casing. 5.