JP2015138175A - display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of effectively preventing the intrusion of external light.SOLUTION: A display device 100 emits display light L, and displays a virtual image with the display light L reflected on a front glass 201. The display device 100 includes: a display part 10 for emitting the display light L; a curved surface mirror 30 for reflecting the display light L to the front glass 201; a shutter part 50 having a plurality of shutters each of which is independently switched to a transmission state or non-transmission state; and a control part 70. The control part 70 allows the curved surface mirror 30 to rotationally move, and adjusts the display position of a virtual image by changing the optical path of the display light L. The control part 70 controls the shutter part 50 to form a transmission window part 51 configured of the shutter in a transmission state such that the display light L emitted by the display part 10 is transmitted, and to change the position of the transmission window part 51 such that the display light L whose optical path has been changed is transmitted.

Description

  The present invention relates to a display device.

  As a conventional display device, one disclosed in Patent Document 1 is known. The display device according to Patent Document 1 is a so-called head-up display device that displays a virtual image by irradiating a predetermined light-transmitting member with display light emitted from a display device. In this type of display device, external light such as sunlight may reach the display device along a path opposite to that of the display light, and the temperature of the display device may rise and be damaged. In the display device according to Patent Document 1, external light is prevented from entering the display device by a light shielding plate provided with a window portion through which display light passes.

JP 2006-11168 A

  In the display device according to Patent Document 1, even if the position of the light shielding plate can be changed as appropriate, the shape of the window itself cannot be changed. Therefore, the window is appropriately arranged in accordance with the display light passing region. There is room for improvement in effectively preventing the intrusion of external light.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a display device that can effectively prevent intrusion of external light.

In order to achieve the above object, a display device according to the first aspect of the present invention provides:
A display device that emits display light representing an image toward a light transmissive member and displays a virtual image of the image by display light reflected by the light transmissive member,
Display means for emitting display light representing the image;
Reflecting means for reflecting the display light emitted by the display means toward the light-transmissive member;
Display position adjusting means for adjusting the display position of the virtual image by moving the reflecting means and changing the optical path of the display light reflected by the reflecting means;
Each having a plurality of shutters that are independently switched to a transmission state or a non-transmission state, and a shutter unit that is positioned on an optical path of display light from the display unit to the translucent member;
By switching each of the plurality of shutters to a transmission state or a non-transmission state, the shutter unit is a transmission window unit including a shutter in one or a plurality of transmission states, and transmits the display light emitted from the display unit. Shutter control means for forming a transmission window portion to be
The shutter control means changes the position of the transmission window portion so that the display light whose optical path has been changed by the display position adjustment means is transmitted.
It is characterized by that.

In order to achieve the above object, a display device according to the second aspect of the present invention provides:
A display device that emits display light representing an image toward a light transmissive member and displays a virtual image of the image by display light reflected by the light transmissive member,
Display means for emitting display light representing the image;
Reflecting means for reflecting the display light emitted by the display means toward the light-transmissive member;
Each having a plurality of shutters that are independently switched to a transmission state or a non-transmission state, and a shutter unit that is positioned on an optical path of display light from the display unit to the translucent member;
By switching each of the plurality of shutters to a transmission state or a non-transmission state, the shutter unit is a transmission window unit including a shutter in one or a plurality of transmission states, and transmits the display light emitted from the display unit. Shutter control means for forming a transmission window portion to be
Viewpoint position detection means for acquiring a captured image of the viewer from an imaging unit that captures the viewer of the virtual image and detecting the viewpoint position of the viewer based on the acquired captured image;
In accordance with the viewpoint position detected by the viewpoint position detection unit, the shutter control unit is configured to transmit the display light that is emitted from the display unit and travels toward the transparent member so as to reach the detected viewpoint position. Change the position of the
It is characterized by that.

  According to the present invention, intrusion of external light can be effectively prevented.

It is a schematic diagram of the display apparatus which concerns on one Embodiment of this invention. It is a schematic block diagram of the display apparatus which concerns on one Embodiment of this invention. (A) And (b) is a top view for demonstrating a shutter part. It is a block diagram for demonstrating the control system of the display apparatus which concerns on one Embodiment of this invention. It is a schematic diagram for demonstrating the optical path change of the display light by the rotational movement of a curved-surface mirror, and an example of the coordinate system of a viewpoint position. (A) And (b) is a figure which shows an example of a shutter pattern table. (A)-(c) is a figure for demonstrating the movement control of the permeation | transmission window part formed in the shutter part of Fig.3 (a). It is a figure which shows an example of a shutter pattern table. (A)-(c) is a figure for demonstrating the movement control of the permeation | transmission window part formed in the shutter part of FIG.3 (b). It is a flowchart of a display control process. (A) is a flowchart of a shutter control process, and (b) is a flowchart of a drawing interruption process.

  An embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the display device 100 according to the present embodiment is installed, for example, in a dashboard of a vehicle 200. The display device 100 emits display light L representing an image toward a windshield 201 (an example of a translucent member) of the vehicle 200, and displays a virtual image V of the image by the display light L reflected by the windshield 210. It is configured as a so-called head-up display device. By displaying the virtual image V in this way, the viewer 1 (mainly the driver of the vehicle 200) recognizes that the display image is far away through the windshield 201.

  Hereinafter, in order to facilitate the understanding of the configuration of the display device 100, the description will be made as appropriate using the X, Y, and Z coordinate systems shown in FIG. As shown in the drawing, the X-axis is along the front-rear direction of the vehicle 200, and the Z-axis is along the vertical direction. The Y axis is along the left-right direction as viewed from the viewer 1 who visually recognizes the virtual image V. The X, Y, and Z axes are orthogonal to each other. Further, in the figure, the direction in which the arrow indicating each axis is directed will be described as the + (plus) direction of the axis and the opposite side as the-(minus) direction as appropriate.

  The display device 100 includes a display unit 10, a folding mirror 20, a curved mirror 30 (an example of a reflection unit), a mirror tilt unit 40, a shutter unit 50, a housing 60, and a control unit 70.

  The display unit 10 emits display light L representing a predetermined image, and includes a light source 11, a liquid crystal display panel 12, a light source substrate 13 on which the light source 11 is mounted, a diffusion case 14, and a heat sink 15. Have.

  The light source 11 is composed of a plurality of LEDs (Light Emitting Diodes). The light source 11 emits light that illuminates the liquid crystal display panel 12. The light source substrate 13 is made of, for example, an aluminum substrate on which various wirings are printed. The light source 11 is electrically connected to the control unit 70 via the light source substrate 13 and emits light under the control of the control unit 70. The diffusion case 14 is formed in white from a resin such as polycarbonate. The diffusion case 14 is provided between the light source 11 and the liquid crystal display panel 12, and diffuses light from the light source 11 to uniformly illuminate the liquid crystal display panel 12. The liquid crystal display panel 12 switches each pixel to a transmission / non-transmission state under the control of the control unit 70, thereby using the light from the light source 11 as illumination light as a predetermined image (an image indicating vehicle information described later). Etc.). Thereby, the display light L is emitted from the liquid crystal display panel 12. The heat sink 15 is made of metal such as aluminum and dissipates heat generated by the light source 11.

  The folding mirror 20 reflects the display light L emitted from the display unit 10 toward the curved mirror 30. The folding mirror 20 is formed, for example, by molding a polycarbonate resin and vacuum-depositing aluminum.

  The curved mirror 30 reflects the display light L emitted from the display unit 10 and reflected by the folding mirror 20 toward the windshield 201. The curved mirror 30 is configured to have a reflective curved surface so as to enlarge an image represented by the display light L reflected by the folding mirror 20 and to correct distortion generated when the display light L is projected onto the windshield 201. . The curved mirror 30 is formed, for example, by molding a polycarbonate resin and vacuum-depositing aluminum.

  The mirror tilt unit 40 rotates the curved mirror 30 around a predetermined axis under the control of the control unit 70. The mirror tilt unit 40 changes the tilt angle (tilt angle) of the curved mirror 30, for example, by rotating the curved mirror 30 around an axis parallel to the Y axis. Thereby, the incident angle of the display light L with respect to the reflecting surface 31 of the curved mirror 30 is changed, the optical path of the display light L after being reflected by the curved mirror 30 is changed, and the display position of the virtual image V is changed.

  The mirror tilt unit 40 includes a stepping motor 41 and a gear mechanism 42 including a plurality of gears including a gear coupled to a rotation shaft 41 a of the stepping motor 41. The stepping motor 41 rotates the rotating shaft 41 a under the control of the control unit 70. The rotational power of the rotary shaft 41a is transmitted to the curved mirror 30 via the gear mechanism. In this way, the tilt angle of the curved mirror 30 changes according to the rotation of the rotation shaft 41a of the stepping motor 41.

  The shutter unit 50 includes a shutter module such as a liquid crystal shutter or a MEMS (Micro Electro Mechanical Systems) shutter, and is positioned between the curved mirror 30 and the windshield 201 as shown in FIG. The shutter unit 50 has a plurality of shutters that are each independently switched to a transmission state or a non-transmission state. Under the control of the control unit 70, the shutter unit 50 switches each of the plurality of shutters to a transmission state or a non-transmission state, thereby forming a transmission window unit 51 including one or a plurality of transmission state shutters. The transmission window 51 formed in this way transmits the display light L reflected by the curved mirror 30 to the windshield 201.

  The shutter unit 50 is provided in order to prevent external light such as sunlight from entering the display device 100 as much as possible by an impermeable portion (light shielding portion) other than the transmissive window portion 51. The shutter unit 50 is configured as shown in FIG. 3A or FIG. 3B, for example.

FIG. 3A shows an example in which a plurality of shutters are configured by arranging strip-shaped shutters 50a extending in the Y-axis direction along the X-axis direction. FIG. 3B shows an example in which a plurality of shutters are configured by arranging rectangular shutters 50b in a matrix in the X and Y axis directions. In any case, the shutter unit 50 includes one or a plurality of transmissive shutters 50a and 50b, and forms a transmission window 51 that transmits the display light L reflected by the curved mirror 30. How to form the transmission window 51 will be described later.
In FIG. 2, the shutter unit 50 is represented by a curved shape, and in FIGS. 3A and 3B, the surface of the shutter unit 50 is represented on the XY plane. It is not essential for 50 functions. This is because even if the actual shutter portion 50 has a curved surface, if each of the shutters 50a and 50b is considered as a projection on the XY plane, it will be as shown in FIGS. Therefore, hereinafter, the positions of the shutters 50a and 50b will be described using the XY plane in order to facilitate understanding of the function of the display device 100.

  The housing 60 accommodates the display unit 10 to the shutter unit 50 described above. The casing 60 is formed with an opening 61 that reflects the curved mirror 30 and transmits the display light L that passes through the transmission window 51 of the shutter unit 50 and travels toward the windshield 201.

Here, the mechanism by which the display device 100 displays the virtual image V will be briefly described.
The display light L emitted from the display unit 10 is reflected in the order of the folding mirror 20 and the curved mirror 30 and travels toward the windshield 201. The light reflected by the curved mirror 30 passes through the transmission window portion 51 of the shutter portion 50, passes through the opening portion 61, and enters the windshield 201. The display light L is reflected by the windshield 201 and travels toward the viewer 1. When the display light L reaches the eyes of the viewer 1, the viewer 1 can visually recognize the virtual image V displayed in front of the windshield 201.

  As shown in FIG. 4, the control unit 70 includes a CPU (Central Processing Unit) 71, a ROM (Read Only Memory) 72, a RAM (Random Access Memory) 73, a VRAM (Video RAM) 74, and an external interface (I / F). 75 and the like, and controls the operation of each part of the display device 100. The control unit 70 can be realized by, for example, a microcomputer, and is mounted on a printed circuit board or the like provided inside (or outside) the housing 60.

  The CPU 71 reads a program stored in the ROM 72 for executing a display control process (FIG. 10), a shutter control process (FIG. 11A), a drawing interrupt process (FIG. 11B), etc., which will be described later. ,Run. The ROM 72 stores data of shutter pattern tables T1 to T3 described later in advance. The RAM 73 temporarily stores calculation results in the processing of the CPU 71, information acquired from an external device, and the like. The VRAM 74 is a display image memory of the display unit 10. This memory is divided into two memory areas, one for display and the other for writing. In addition, the CPU 71 incorporates a timer that can measure time, and performs time measurement as appropriate.

  The CPU 71 is connected to an external device such as an operation unit 80, an imaging unit 90, and an ECU (Electronic Control Unit) 202 via an external I / F 75 or a driver (not shown).

  The operation unit 80 includes various switches that accept operations for adjusting the display position of the virtual image V and adjusting the display luminance (the light emission luminance adjustment of the light source 11).

  The imaging unit 90 is a video camera module including, for example, a plurality of lenses, a solid-state imaging device such as a CCD (Charged Coupled Device) and a CMOS (Complementary Metal Oxide Semiconductor), a shutter, and the like. The imaging unit 90 forms an image of a subject on the light receiving surface of the solid-state imaging device using a lens when the shutter is open, converts the intensity of the formed image light into an electrical signal, and the electrical signal Is output to the control unit 70. In the present embodiment, the imaging unit 90 images the viewer 1 of the virtual image V as a subject.

  The ECU 202 is mounted in the vehicle 200 and transmits vehicle information such as the speed of the vehicle 200 and the engine speed to the control unit 70.

  The control unit 70 has functions as a viewpoint position detection unit, a display position adjustment unit, and a shutter control unit.

  The control unit 70 acquires a captured image of the viewer 1 from the imaging unit 90 that captures the viewer 1 of the virtual image V as viewpoint position detection means, and detects the viewpoint position of the viewer 1 based on the acquired captured image. . The control unit 70 detects the viewpoint position by known image processing, template matching processing, or the like.

As an example, the control unit 70 detects the viewpoint position by the following method.
Photodiodes constituting the solid-state imaging device of the imaging unit 90 are arranged in a matrix. On the light receiving surface of the solid-state imaging device, an image of a subject (here, viewer 1) is formed as a frame image made up of matrix-like pixels corresponding to the photodiodes. Here, in a frame image, a pixel group in a predetermined row is referred to as a line, an odd field image including an odd row pixel group (line), and an even field image including an even row pixel group (line). I will decide.
(1) The control unit 70 controls a light source (not shown) when the imaging unit 90 images a subject, illuminates the subject at the imaging timing of the odd field image, and turns off the light source at the imaging timing of the even field image.
(2) Subsequently, the control unit 70 acquires image data for one frame (data representing one captured image) from the video signal output from the imaging unit 90.
(3) Subsequently, the control unit 70 generates an image (interpolated odd field image) obtained by interpolating lines having the average value of the luminance values of pixels opposed in the vertical direction as luminance values between the lines constituting the odd field image. To do. Similarly, the control unit 70 generates an image (interpolated even field image) obtained by interpolating a line having an average value of luminance values of pixels opposed in the vertical direction as luminance values between lines constituting the even field image.
(4) Subsequently, the control unit 70 compares the interpolated odd field image and the interpolated even field image, and obtains a subject detection image indicating the subject region. For example, the control unit 70 compares the luminance values of the pixels at the corresponding positions between the two images, and if the difference between the luminance values is larger than a predetermined value, the pixel at the position is a pixel in the subject area. Determine that there is.
(5) Subsequently, the control unit 70 acquires (detects) the viewpoint position by executing template matching processing on the subject region on the subject detection image.

  The control unit 70 acquires the viewpoint position as coordinates. For example, as shown in FIG. 5, the position in the xy coordinate system using the x-axis along the left-right direction as viewed from the viewer 1 and the y-axis that is along the vertical direction and is orthogonal to the x-axis. The control unit 70 acquires the viewpoint position. The viewpoint position may be a point at which the interval between the left eye and the right eye of the viewer 1 is equally divided, or may be the position of either the left or right eye. How to determine the viewpoint position can be appropriately changed according to the purpose.

  Further, the control unit 70 adjusts the display position of the virtual image V by rotating the curved mirror 30 and changing the optical path of the display light L after being reflected by the curved mirror 30 as display position adjusting means.

  For example, the control unit 70 controls the operation of the mirror tilt unit 40 in response to an operation for adjusting the display position of the virtual image V from the operation unit 80. Specifically, the control unit 70 drives the stepping motor 41 to rotate the rotation shaft 41a by a rotation angle corresponding to the operation content. The rotating shaft 41 a rotates the curved mirror 30 via the gear mechanism 42. The drive control of the stepping motor 41 is performed by the control unit 70 outputting a count number (step number) associated with the rotation angle of the rotation shaft 41a.

Here, referring to FIG. 5, it is assumed that curved mirror 30 rotates counterclockwise when the number of steps of stepping motor 41 decreases, and curved mirror 30 rotates clockwise when the number of steps increases. Further, representative of the optical path of the display light at the reference position of the curved mirror 30 with L _0.
In the case where the curved mirror 30 is located at the reference position, to reduce the number of steps the control unit 70 outputs, to rotate the curved mirror 30 in a counterclockwise direction, display light after being reflected by the curved mirror 30 in the optical path L ₁ move on. In this case, the display position of the virtual image V is adjusted by moving downward. On the other hand, when the curved mirror 30 is at the reference position, if the number of steps output by the control unit 70 is increased and the curved mirror 30 is rotated clockwise, the display light reflected by the curved mirror 30 is the optical path L _2. Go on. In this case, the display position of the virtual image V is adjusted by moving upward. In this way, the control unit 70 adjusts the display position of the virtual image V with the function as the display position adjusting unit.

  In addition, when the viewpoint position of the viewer 1 acquired by the viewpoint position detection unit becomes high (y coordinate becomes large), the control unit 70 rotates the curved mirror 30 clockwise to move the display position of the virtual image V upward. When the acquired viewpoint position becomes lower (y coordinate becomes smaller), the curved mirror 30 is rotated counterclockwise to move the display position of the virtual image V downward. In this way, the control unit 70 automatically changes the tilt angle of the curved mirror 30 according to the viewpoint position of the viewer 1 as well as the operation from the operation unit 80.

  Further, the control unit 70 forms the transmission window 51 in the shutter unit 50 by switching each of the plurality of shutters 50a (or the shutter 50b) to the transmission state or the non-transmission state as shutter control means.

As shown in FIG. 3A, in the example in which the shutter unit 50 is configured by a belt-shaped shutter 50a arranged in the X-axis direction, the control unit 70 determines the y-coordinate of the viewpoint position detected by the viewpoint position detection unit. The transmission window portion 51 is moved in accordance with the change (change in the viewpoint height of the viewer 1).
Here, information indicating a region through which the display light L is transmitted in the shutter unit 50 (that is, a region where the transmission window portion 51 is formed in the shutter unit 50) is referred to as a shutter pattern. For example, as shown in FIG. 3A, numerical values “0 to 15” are assigned to the respective shutters 50a, and the shutter pattern is determined by a combination of these numerical values.
When acquiring the viewpoint position, the control unit 70 refers to the shutter pattern table T1 (FIG. 6A) stored in advance in the ROM 72 in which the y coordinate of the viewpoint position and the shutter pattern are associated with each other. A combination of a numerical value corresponding to the y coordinate of the position is determined as a shutter pattern. The combination of numerical values indicated by the shutter pattern represents the shutter 50a that should be in the transmissive state. For this reason, the shutter 50a at a position not indicated by these numerical values is controlled to be in an opaque state. Then, the control unit 70 controls the shutter unit 50 so as to realize the determined shutter pattern, and forms the transmission window unit 51.

  Referring to FIGS. 6A and 3A, if the y coordinate value decreases, the transmission window portion 51 moves in the -X direction. If the y coordinate value increases, the transmission window portion 51 changes. It can be seen that it moves in the + X direction. That is, when the viewer 1 has a low viewpoint, the transmission window 51 moves toward the front of the viewer 1, and when the viewer 1 has a high viewpoint, the transmission window 51 moves toward the rear of the viewer 1. Will move. Such movement of the transmission window 51 will be described more specifically with reference to FIGS. 5 and 7A to 7C.

Assume that a point on the xy plane in FIG. 5 is the viewpoint position EP, and when the y coordinate of the viewpoint position EP is 0, the transmission window 51 is at the position of FIG. When the y coordinate of the acquired viewpoint position becomes −β (see FIG. 5), the control unit 70 moves the transmission window 51 in the −X direction so as to be in the state of FIG. 7B to FIG. Let The position of the transmission window portion 51 in FIG. 7A is a position that transmits the display light traveling on the optical path L1 in FIG. When the y coordinate of the acquired viewpoint position becomes + β (see FIG. 5), the control unit 70 moves the transmission window 51 in the + X direction so as to be in the state of FIG. 7B to FIG. 7C. The position of the transmission window 51 in FIG. 7C is a position that transmits the display light traveling on the optical path L2 in FIG.
In this way, if the viewer 1 has a low viewpoint, the transmissive window 51 moves toward the front of the viewer 1, and if the viewer 1 has a high viewpoint, the transmissive window 51 is the viewer 1's. It will move backwards. In this case, the control unit 70 also changes the tilt angle of the curved mirror 30 according to the viewpoint position.

  Further, the control unit 70 may move the transmission window unit 51 according to a change in the number of steps (that is, according to a change in the tilt angle of the curved mirror 30). In this case, when an operation for adjusting the display position of the virtual image V is performed from the operation unit 90, the control unit 70 stores the shutter pattern table T2 stored in advance in the ROM 72 and associated with the number of steps and the shutter pattern (FIG. 6). Referring to (b)), a combination of the number of steps corresponding to the operation content and the corresponding numerical value is determined as a shutter pattern.

As shown in FIG. 3B, in the example in which the shutter unit 50 is composed of rectangular shutters 50b arranged in the X and Y axis directions, the control unit 70 determines the viewpoint position detected by the viewpoint position detection means. The transmission window 51 is moved according to changes in the x and y coordinates. For example, as illustrated in FIG. 3B, the position of each shutter 50 b is a numerical value “0-15” assigned along the X-axis direction and a numerical value “0-11” assigned along the Y-axis direction. The shutter pattern is determined by a combination of positions of the plurality of shutters 50b.
When acquiring the viewpoint position, the control unit 70 refers to the table T3 (FIG. 8) stored in advance in the ROM 72 in which the viewpoint position (x, y) and the shutter pattern are associated with each other, and corresponds to the acquired viewpoint position. The combination of the positions of the shutters 50b to be determined is determined as the shutter pattern. Note that the combination of the positions of the shutter 50b indicated by the shutter pattern represents the shutter 50b that should be in the transmissive state. Therefore, the shutter 50b at a position that is not shown by these combinations is controlled to the non-transmissive state. Then, the control unit 70 controls the shutter unit 50 so as to realize the determined shutter pattern, and forms the transmission window unit 51. Thereby, the transmission window part 51 can be formed and moved in accordance with not only the change in the height of the viewpoint of the viewer 1 but also the change in the horizontal direction (left and right direction as viewed from the viewer 1). Such movement of the transmission window 51 will be described more specifically with reference to FIGS. 5 and 9A to 9C.

When the viewpoint position EP shown in FIG. 5 is (x, y) = (0, 0), it is assumed that the transmission window portion 51 is at the position shown in FIG. When the acquired viewpoint position (x, y) becomes (−α, −β), the control unit 70 moves the transmission window 51 in the −X direction so as to change the state from FIG. 9B to FIG. 9A. And move in the + Y direction. When the acquired viewpoint position (x, y) becomes (α, β), the control unit 70 moves the transmission window 51 in the + X direction and −Y so that the transmission window 51 is in the state from FIG. 9B to FIG. Move in the direction.
As described above, in the control using the shutter unit 50 having the shutters 50b arranged in a matrix, the transmission window unit 51 that transmits the display light is formed in accordance with the movement of the visual point position of the viewer 1 in the vertical and horizontal directions. be able to.

  When the shutter unit 50 having the shutters 50b arranged in a matrix is used, the movement of the transmission window 51 in the X direction is performed by changing the number of steps using a table as shown in FIG. It is also possible to control only the movement of the transmission window 51 in the Y direction according to the change of the x coordinate of the viewpoint position. That is, the transmission window 51 can be moved by the control unit 70 in accordance with either or both of the acquired viewpoint position and the number of steps.

  From here, the display control process which the control part 70 (CPU71) performs is demonstrated with reference to FIG. 10, FIG. 11 (a) (b). For example, the control unit 70 starts the display control process when the power of the display device 100 is turned on.

(Display control processing)
First, the control unit 70 initializes the RAM 73 and the like, and starts a timer interrupt function (step A1). A drawing interrupt process (FIG. 11B) to be described later is called by a timer interrupt generated at a predetermined timing.

  Subsequently, the control unit 70 acquires external data (step A2). Specifically, as external data, control unit 70 acquires vehicle information such as vehicle speed and engine speed from ECU 202. In addition, the control unit 70 acquires the viewpoint position (x, y) of the viewer 1 based on the video signal from the imaging unit 90 by the function of the viewpoint position detection unit described above. Further, the control unit 70 acquires the state of the switches of the operation unit 80, and determines whether or not there has been an operation for adjusting the display position of the virtual image V or a display luminance adjustment.

  Subsequently, the control unit 70 controls the light source 11 to emit light with a predetermined luminance (step A3). When a display brightness adjustment operation is performed from the operation unit 80, the control unit 70 causes the light source 11 to emit light with a brightness according to the operation content. For example, the control unit 70 drives the light source 11 by PWM (Pulse Width Modulation) control.

  Then, the control part 70 produces | generates the data (display data) of the image showing the vehicle information acquired by step A2 (step A4).

  Subsequently, the control unit 70 determines whether or not the tilt angle of the curved mirror 30 has been changed (step A5). Specifically, when the tilt angle of the curved mirror 30 has been changed in the previous process (step A8 described later) (step A5; Yes), the control unit 70 executes a shutter control process (step A6).

(Shutter control processing)
When the process proceeds to step A6, the control unit 70 executes the shutter control process in the order shown in FIG. 11A by the function of the shutter control unit described above.

  First, the control unit 70 determines a shutter pattern (step B1). As described above, the control unit 70 determines the shutter pattern according to the acquired viewpoint position (x, y) or the number of steps of the stepping motor 41. Specifically, as shown in FIG. 3A, when the shutter unit 50 is composed of a plurality of strip-shaped shutters 50 a, the control unit 70 controls the shutter pattern table T <b> 1 or T <b> 2 stored in the ROM 72. With reference to FIGS. 6A and 6B, the shutter pattern is determined. As shown in FIG. 3B, in the case where the shutter unit 50 is composed of rectangular shutters 50b arranged in a matrix, the control unit 70 controls the shutter pattern table T3 (FIG. 8) stored in the ROM 72. ), The shutter pattern is determined.

  Subsequently, the control unit 70 controls the shutter unit 50 so as to realize the determined shutter pattern, and forms a transmission window unit 51 in the shutter unit 50 (step B2). Thereby, as described above, the transmission window 51 that moves in accordance with the change in the viewpoint position of the viewer 1 and the change in the tilt angle of the curved mirror 30 is formed.

  Returning to FIG. 10, after the shutter control process is performed or when the tilt angle is not changed (step A5; No), the control unit 70 displays the display data generated in step A4 and a predetermined screen design. Based on the above, an image for informing the vehicle information is displayed on the liquid crystal display panel 12 (step A7).

  Subsequently, the control unit 70 controls the tilt angle of the curved mirror 30 (step A8). Specifically, when it is determined in step A2 that the display position of the virtual image V is adjusted or the display brightness is adjusted, the control unit 70 sets the rotation angle of the rotation shaft 41a by the function of the display position adjustment unit. The associated count number (step number) is output, and the stepping motor 41 is driven. When the tilt angle is automatically changed according to the acquired viewpoint position regardless of the operation from the operation unit 80, the control unit 70 determines the y-coordinate and the number of steps of the viewpoint position stored in the ROM 72 in advance. Is referred to (not shown), the number of steps is determined, and the stepping motor 41 is driven with the determined number of steps. After executing the process of step A8, the control unit 70 returns the process to step A2.

(Drawing interrupt processing)
Further, the control unit 70 executes a drawing interrupt process shown in FIG. 11B at every timer interrupt timing started in step A1. For example, a timer interrupt occurs every 20 ms. When the drawing interrupt process is started, the control unit 70 determines whether or not drawing is completed (step C1). When the drawing has been completed (step C1; Yes), the control unit 70 switches the memory area for writing in the VRAM 74 to the display memory area, and causes the display unit 10 to display the image after the drawing has been completed (step S1). C2). After a new image is displayed (step C2) or when drawing has not yet been completed (step C1; No), the drawing interrupt process ends.

  For example, the control unit 70 repeatedly executes display control processing and drawing interrupt processing until the display device 100 is powered off.

  The display device 100 described above emits display light L representing an image toward a windshield 201 (an example of a light-transmissive member), and displays a virtual image V of the image by the display light L reflected by the windshield 201. The display device 100 includes a display unit 10 (an example of a display unit) that emits display light L that represents the image, and a curved mirror 30 that reflects the display light L emitted from the display unit 10 toward the windshield 201 ( An example of reflecting means) and display position adjusting means for adjusting the display position of the virtual image V by rotating the curved mirror 30 and changing the optical path of the display light L after being reflected by the curved mirror 30 are independent of each other. The shutter unit 50 has a plurality of shutters 50a and 50b that are switched to a transmission state or a non-transmission state, and is positioned between the curved mirror 30 and the windshield 201, and a plurality of shutters. By switching each of the screens 50a and 50b to the transmissive state or the non-transmissive state, the display unit 10 emits to the shutter unit 50, which is a transmissive window unit 51 including one or more transmissive shutters 50a and 50b. Shutter control means for forming a transmission window portion 51 that transmits the display light L, and the shutter control means transmits the display light L whose optical path has been changed by the display position adjustment means. Change position.

  The display device 100 is a display device 100 that emits display light L representing an image toward the windshield 201 and displays a virtual image V of the image by the display light L reflected by the windshield 201, the image The display unit 10 that emits the display light L representing the above, the curved mirror 30 that reflects the display light L emitted from the display unit 10 toward the windshield 201, and a plurality of switches that are independently switched to a transmission state or a non-transmission state. The shutter unit 50 has a plurality of shutters 50a and 50b, and the shutter unit 50 positioned between the curved mirror 30 and the windshield 201 and each of the plurality of shutters 50a and 50b are switched to the transmission state or the non-transmission state. The transmission window 51 is composed of one or a plurality of transmission shutters 50a and 50b, and transmits the display light L emitted from the display unit 10. The captured image of the viewer 1 is acquired from the shutter control unit that forms the transmission window 51 and the imaging unit 90 that captures the viewer 1 of the virtual image V, and the viewpoint position of the viewer 1 is determined based on the acquired captured image. Viewpoint position detecting means for detecting, and the shutter control means detects the viewpoint position detected by the display light L emitted from the display unit 10 toward the windshield 201 in accordance with the viewpoint position detected by the viewpoint position detecting means. The position of the transmission window portion 51 is changed so as to reach.

Since the display device 100 is configured as described above, the transmissive window 51 can be formed and moved in accordance with the optical path change of the display light L. As a result, the shutter unit can block as much as possible the portion other than the portion necessary as the display light L passing region, and therefore, it is possible to effectively prevent external light such as sunlight from entering the display device 100. In addition, damage to the display unit 10 due to a temperature rise can be suppressed.
The plurality of shutters may be configured by arranging strip-shaped shutters 50a along a predetermined direction, or may be configured by arranging rectangular shutters 50b in a matrix.

  The present invention is not limited to the above embodiment, and various modifications can be made. An example of modification is shown below.

  The example in which the shutter unit 50 is disposed between the curved mirror 30 and the windshield 201 has been described above. However, the shutter unit 50 displays from the display unit 10 to the windshield 201 (an example of a translucent member). It only needs to be located on the optical path of the light L. That is, the shutter unit 50 may be disposed between the display unit 10 and the folding mirror 20 on the optical path of the display light L, or between the folding mirror 20 and the curved mirror 30. The external light that has entered the display device 100 becomes convergent light by the curved mirror 30 and travels to the folding mirror 20 and the display unit 10, so that the irradiation area of external light becomes narrower as the position is closer to the display unit 10. The amount of light per area increases. Therefore, as the shutter unit 50 is arranged closer to the display unit 10, the area of the shutter unit 50 can be reduced, and the component cost can be reduced. In order to reduce the load on the shutter unit 50 due to external light, it is desirable that the shutter unit 50 be disposed at a position close to the curved mirror 30 where external light is not converged so much.

  FIGS. 7A to 7C and FIGS. 9A to 9C show examples in which the transmission window 51 having a predetermined shape moves. However, the shape of the transmission window 51 is changed in accordance with the movement. May be. For example, the control unit 70 may control the shutter unit 50 so as to change the size of the transmission window unit 51 according to the size of the display image of the display unit 10.

  In the above description, an example in which the curved mirror 30 is rotationally moved has been shown, but the present invention is not limited to this. The display device 100 is provided with a moving mechanism that translates the curved mirror 30, and the control unit 70 translates the curved mirror 30 and changes the optical path of the display light L after being reflected by the curved mirror 30. The display position may be adjusted.

  The display unit 10 may be composed of an organic EL (ElectroLuminescence) display, a projection display, or the like.

  In the above description, the example in which the virtual image V is projected onto the windshield 201 has been shown. However, the virtual image V may be projected onto a combiner (an example of a translucent member) dedicated to the display device 100.

  Although the example which mounts the display apparatus 100 in the vehicle 200 was shown in the above description, it can also be mounted in other vehicles, such as an aircraft, a ship, and a machine tool.

  In the above description, in order to facilitate the understanding of the present invention, the description of known unimportant technical matters is appropriately omitted.

DESCRIPTION OF SYMBOLS 100 ... Display apparatus 10 ... Display part 20 ... Folding mirror 30 ... Curved surface mirror 40 ... Mirror tilt part 50 ... Shutter part 50a, 50b ... Shutter 51 ... Transmission window part 60 ... Housing | casing 70 ... Control part 80 ... Operation part 90 ... Imaging Part 200 ... Vehicle 201 ... Windshield 202 ... ECU
1 ... Viewer
L: Display light
V ... Virtual image

Claims (6)

A display device that emits display light representing an image toward a light transmissive member and displays a virtual image of the image by display light reflected by the light transmissive member,
Display means for emitting display light representing the image;
Reflecting means for reflecting the display light emitted by the display means toward the light-transmissive member;
Display position adjusting means for adjusting the display position of the virtual image by moving the reflecting means and changing the optical path of the display light reflected by the reflecting means;
Each having a plurality of shutters that are independently switched to a transmission state or a non-transmission state, and a shutter unit that is positioned on an optical path of display light from the display unit to the translucent member;
By switching each of the plurality of shutters to a transmission state or a non-transmission state, the shutter unit is a transmission window unit including a shutter in one or a plurality of transmission states, and transmits the display light emitted from the display unit. Shutter control means for forming a transmission window portion to be
The shutter control means changes the position of the transmission window portion so that the display light whose optical path has been changed by the display position adjustment means is transmitted.
A display device characterized by that. Further comprising viewpoint position detection means for acquiring a captured image of the viewer from an imaging unit that captures the viewer of the virtual image, and detecting the viewpoint position of the viewer based on the acquired captured image;
The display position adjusting means adjusts the display position of the virtual image according to the viewpoint position detected by the viewpoint position detecting means;
The display device according to claim 1. A display device that emits display light representing an image toward a light transmissive member and displays a virtual image of the image by display light reflected by the light transmissive member,
Display means for emitting display light representing the image;
Reflecting means for reflecting the display light emitted by the display means toward the light-transmissive member;
Each having a plurality of shutters that are independently switched to a transmission state or a non-transmission state, and a shutter unit that is positioned on an optical path of display light from the display unit to the translucent member;
By switching each of the plurality of shutters to a transmission state or a non-transmission state, the shutter unit is a transmission window unit including a shutter in one or a plurality of transmission states, and transmits the display light emitted from the display unit. Shutter control means for forming a transmission window portion to be
Viewpoint position detection means for acquiring a captured image of the viewer from an imaging unit that captures the viewer of the virtual image and detecting the viewpoint position of the viewer based on the acquired captured image;
In accordance with the viewpoint position detected by the viewpoint position detection unit, the shutter control unit is configured to transmit the display light that is emitted from the display unit and travels toward the transparent member so as to reach the detected viewpoint position. Change the position of the
A display device characterized by that. Further comprising display position adjusting means for adjusting the display position of the virtual image by moving the reflecting means and changing the optical path of the display light after being reflected by the reflecting means;
The display position adjusting means adjusts the display position of the virtual image according to the viewpoint position detected by the viewpoint position detecting means;
The display device according to claim 3. The plurality of shutters are configured by arranging strip-shaped shutters along a predetermined direction.
The display device according to claim 1, wherein the display device is a display device. The plurality of shutters are configured by arranging rectangular shutters in a matrix.
The display device according to claim 1, wherein the display device is a display device.

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