Projection device and control method of projection device

Abstract

Projection device and control method of projection device. Reduce scanning frequency. The projection device of the invention has: a light emitting display panel in which a plurality of pixels having light emitting elements are arranged in a matrix; a scanning mirror that reflects image light emitted from the light emitting display panel toward a scanned surface and scans the reflected image light two-dimensionally on the scanned surface; and a projection optical system that guides the image light from the light emitting display panel to the scanning mirror.

Description

Technical Field

[0001] This invention relates to a projection device and a method for controlling the projection device. Background Technology

[0002] Patent Document 1 below discloses a projection display device that projects images by means of a laser array and a scanner configured in a linear shape.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2011-169988

[0004] Since the scanning angle of a scanner is inversely proportional to the scanning frequency, increasing the scanning angle to display a larger image results in a decrease in the scanning frequency. That is, the image frame rate decreases. Furthermore, as the vertical (Y-axis) dimension of the image increases, the vertical dimension of the scanner also increases, and the optical system becomes larger. For example, to display a 4K image, approximately 2000 pixels are needed vertically. In this case, even if the vertical dimension of a pixel is 2μm, a panel with a vertical dimension of 4mm is required; as the panel size increases, the scanner size also increases. Summary of the Invention

[0005] To address the aforementioned issues, one aspect of the projection device of the present invention comprises: a light-emitting display panel having a plurality of pixels having light-emitting elements arranged in a matrix; a scanning mirror reflecting image light emitted from the light-emitting display panel toward a scanned surface and scanning the reflected image light in two dimensions on the scanned surface; and a projection optical system guiding the image light from the light-emitting display panel to the scanning mirror.

[0006] In one aspect of the control method for a projection device according to the present invention, the projection device comprises: a light-emitting display panel having a plurality of pixels having light-emitting elements arranged in a matrix; a scanning mirror; and a projection optical system that guides image light from the light-emitting display panel to the scanning mirror, wherein the scanning mirror reflects the image light emitted from the light-emitting display panel toward a surface to be scanned, and scans the reflected image light in two dimensions on the surface to be scanned. Attached Figure Description

[0007] Figure 1 This is a schematic diagram showing an overall image of a projection device according to one embodiment of the present invention.

[0008] Figure 2 This is a schematic diagram showing the main structural components of the projection device.

[0009] Figure 3 This is a schematic structural diagram showing the overall structure of the light-emitting display panel mounted on the projection device.

[0010] Figure 4 This is an equivalent circuit diagram showing an example of the circuit structure of each pixel disposed on a light-emitting display panel.

[0011] Figure 5 This is a diagram schematically illustrating an example of the mechanical structure of a MEMS scanner with a scanning mirror.

[0012] Figure 6 This is a diagram that schematically illustrates the relationship between the rotation angle θ of the scanning mirror about the Y-axis and the position of the scanning point on the scanned surface.

[0013] Figure 7 This schematically illustrates the rotation angle of the scanning mirror about the X-axis. A graph showing the relationship between the position of the scanning point and the position of the scanning point on the surface being scanned.

[0014] Figure 8 This is a diagram showing the scannable area within the in-plane region of the scanned surface that can be scanned by the scanning mirror.

[0015] Figure 9 This is a diagram showing an example of a scan path set within the scannable area of ​​the scanned surface.

[0016] Figure 10 This is a diagram showing an example of an input image.

[0017] Figure 11 It is a timing diagram showing the time correspondence between the X-direction position of the scan point and the amount of light emitted by the light-emitting display panel in step scan mode.

[0018] Figure 12 This diagram illustrates how, in step scan mode, the scan points pass through the image display points set on the scan path to sequentially form sub-images on the scanned surface.

[0019] Figure 13 This is the first explanatory diagram of the overlapping area set in the sub-image.

[0020] Figure 14 The second illustration shows the overlapping area set in the sub-image.

[0021] Figure 15 This is the third explanatory diagram showing the overlapping areas set in the sub-image.

[0022] Figure 16 The fourth illustration shows the overlapping areas set in the sub-image.

[0023] Figure 17 This diagram illustrates how, in continuous scanning mode, the scan points pass through the image display points set on the scan path to sequentially form sub-images on the scanned surface.

[0024] Figure 18 It is a timing diagram showing the time correspondence between the X-direction position of the scanning point, the main scanning rotation angle θ of the scanning mirror 4, and the amount of light emitted by the light-emitting display panel in continuous scanning mode.

[0025] Figure 19 This is a schematic diagram illustrating an example of the mechanical structure of a MEMS scanner capable of implementing step-scanning modes in a mechanical structure.

[0026] Figure 20 This diagram schematically illustrates the periodic rotation of the scanning mirror during the continuous rotation of the rotating frame.

[0027] Figure 21 This is a timing diagram showing the time correspondence between the mirror rotation angle θ1, the frame rotation angle θ2, and the main scan rotation angle θ.

[0028] Figure 22 This diagram schematically illustrates a combination of a scanning mirror and a multifaceted mirror capable of implementing a step-scanning mode on a mechanical structure.

[0029] Label Explanation

[0030] 1 Projection device; 2 Light-emitting display panel; 3 Projection optical system; 4 Scanning mirror; 5 fθ lens; 6 Controller (control unit); 11 Pixel; 54 Light-emitting element; 200 Scanned surface; L Image light. Detailed Implementation

[0031] Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

[0032] In addition, in the following figures, the scale of the dimensions is sometimes different depending on the constituent elements so that they can be easily observed.

[0033] Figure 1 This is a schematic diagram showing the overall image of the projection device 1 in this embodiment. (See diagram for example.) Figure 1 As shown, the projection device 1 of this embodiment is a projection-type display device that includes a light-emitting display panel 2, a projection optical system 3, and a scanning mirror 4. It projects image light L onto a scanned surface 200 and displays an image on the scanned surface 200 by scanning the image light L in two dimensions. The scanned surface 200 is the surface of the object onto which the image light L is projected. The scanned surface 200 can be the surface of a projection screen, or it can be a wall surface, etc.

[0034] In the figures, the XYZ coordinate system is appropriately represented as a 3D orthogonal coordinate system. The Z-axis direction is orthogonal to the scanned surface 200. The XY plane, which includes the mutually orthogonal X-axis and Y-axis directions, is a plane parallel to the scanned surface 200. In the following description, the direction parallel to the X-axis is sometimes referred to as the "lateral direction," and the direction parallel to the Y-axis is sometimes referred to as the "vertical direction." Additionally, the positive side (+X side) in the lateral direction is sometimes referred to as the "right side," and the negative side (-X side) is sometimes referred to as the "left side." Furthermore, the positive side (+Y side) in the vertical direction is sometimes referred to as the "upper side," and the negative side (-Y side) is sometimes referred to as the "lower side."

[0035] In addition, horizontal, vertical, right, left, top, and bottom are merely names used to describe the relative positional relationships of each part. The actual configuration relationships may be other than those represented by these names.

[0036] Figure 2 This is a schematic diagram showing the main structural components of the projection device 1 according to this embodiment. Figure 2 As shown, the projection device 1 of this embodiment includes a light-emitting display panel 2, a projection optical system 3, a scanning mirror 4, an fθ lens 5, and a controller 6 (control unit).

[0037] The light-emitting display panel 2 is a light-emitting display panel in which multiple pixels having light-emitting elements are arranged in a matrix. As an example, the light-emitting display panel 2 in this embodiment is a self-emissive electro-optical device such as an OLED (Organic Light Emitting Diode) panel, a μLED (Micro Light Emitting Diode) panel, or an LD (Laser Diode) panel. A self-emissive electro-optical device is a device that generates light itself using externally supplied electrical energy without requiring a backlight or other light source.

[0038] Details will be described later. The light-emitting display panel 2 has a plurality of pixels arranged in a matrix. The number of pixels in the vertical direction (row direction) of the light-emitting display panel 2 is m, and the number of pixels in the horizontal direction (column direction) of the light-emitting display panel 2 is n. m and n are integers greater than or equal to 2. As an example, in this embodiment, the number of pixels m in the vertical direction of the light-emitting display panel 2 is 200, and the number of pixels n in the horizontal direction of the light-emitting display panel 2 is 200.

[0039] Each pixel of the light-emitting display panel 2 has multiple light-emitting elements that emit visible light of different colors. As an example, in this embodiment, each pixel has one red light-emitting element emitting red light, one green light-emitting element emitting green light, and two blue light-emitting elements emitting blue light, for a total of four light-emitting elements. The brightness of the four light-emitting elements of each pixel is controlled by the controller 6, thereby displaying a color image on the light-emitting display panel 2. The light-emitting display panel 2 emits image light L representing the image displayed on the light-emitting display panel 2 to the projection optical system 3. The image light L contains visible light (colored light) emitted from the four light-emitting elements of each pixel of the light-emitting display panel 2.

[0040] Figure 3 This is a schematic structural diagram showing the overall structure of the light-emitting display panel 2. (See diagram for example.) Figure 3 As shown, pixel regions 12 and non-pixel regions 13 are provided on the substrate 14 of the light-emitting display panel 2. The non-pixel regions 13 include a peripheral region 15 and a mounting region 16. The pixel region 12 is a rectangular region in which m × n pixels 11 are arranged in a matrix. Within the pixel region 12, m scan lines 31 extending horizontally, m control lines 32 extending horizontally corresponding to each scan line 31, and n data lines 33 extending vertically are provided. As described above, in this embodiment, m and n are 200. The pixels 11 have... Figure 4 The circuit structure is shown below. The circuit structure of pixel 11 will be described later.

[0041] The peripheral region 15 is a rectangular frame-shaped area surrounding the pixel region 12. Three driving circuits 35 are disposed within the peripheral region 15. The three driving circuits 35 are circuits that drive each pixel 11 within the pixel region 12. The driving circuits 35 include two scan line driving circuits 36 and a data line driving circuit 37. The mounting region 16 is disposed on the side opposite to the pixel region 12, i.e., outside the peripheral region 15, separated by the peripheral region 15. Multiple mounting terminals 39 are provided in the mounting region 16. Various signals required for driving each pixel 11, such as control signals and power supply potentials, are supplied from the controller 6 to the mounting terminals 39 via flexible cables (not shown).

[0042] Figure 4 This is an equivalent circuit diagram showing an example of the circuit structure of each pixel 11. Since the circuit structure of each pixel 11 is identical, the following explanation uses the circuit structure of the pixel 11 located in row i and column j as an example. Furthermore, "i" is a notation generally representing the row number of the pixel 11, and is an integer greater than 1 and less than m. "j" is a notation generally representing the column number of the pixel 11, and is an integer greater than 1 and less than n.

[0043] In this embodiment, four light-emitting elements are provided in each pixel 11, so multiple data lines 33 would normally be required for one pixel 11. However, for the sake of simplicity, the circuit structure for driving one of the four light-emitting elements provided in each pixel 11 will be described in a representative manner below.

[0044] like Figure 4 As shown, pixel 11 includes a selection transistor 51, a driving transistor 52, a light-emitting control transistor 53, a light-emitting element 54, and a holding capacitor 55. In this embodiment, the selection transistor 51, the driving transistor 52, and the light-emitting control transistor 53 are all P-channel MOS-FETs.

[0045] The gate electrode of the select transistor 51 is electrically connected to the scan line 31 in the i-th row. The other side of the source / drain region of the select transistor 51 is electrically connected to the data line 33 in the j-th column. One side of the source / drain region of the select transistor 51 is electrically connected to the gate electrode of the drive transistor 52 and one electrode of the holding capacitor 55. The back gate of the select transistor 51 is electrically connected to the power supply wiring 61 for applying the power supply potential.

[0046] The gate electrode of the driving transistor 52 is electrically connected to one electrode of the source / drain region of the selection transistor 51 and one electrode of the holding capacitor 55. One side of the source / drain region of the driving transistor 52 is electrically connected to the power supply wiring 61. The other side of the source / drain region of the driving transistor 52 is electrically connected to one side of the source / drain region of the light-emitting control transistor 53. The back gate of the driving transistor 52 is electrically connected to the power supply wiring 61.

[0047] The gate electrode of the light-emitting control transistor 53 is electrically connected to the control line 32 in the i-th row. One of the source / drain regions of the light-emitting control transistor 53 is electrically connected to the other of the source / drain region of the driving transistor 52. The other of the source / drain region of the light-emitting control transistor 53 is electrically connected to the anode of the light-emitting element 54. The back gate of the light-emitting control transistor 53 is electrically connected to the power supply wiring 61.

[0048] The light-emitting element 54 is a light-emitting element that emits visible light of a specified color. The light-emitting element 54 is a structure in which the light-emitting layer is sandwiched between an anode and a cathode, such as an OLED, μLED, or LD. The anode of the light-emitting element 54 is electrically connected to the other side of the source / drain region of the light-emitting control transistor 53. The cathode of the light-emitting element 54 is electrically connected to a common wiring 62 to which a common potential is applied.

[0049] The holding capacitor 55 is a capacitor used to maintain the gate potential of the driving transistor 52. One electrode of the holding capacitor 55 is electrically connected to one of the source / drain regions of the selection transistor 51 and the gate electrode of the driving transistor 52. The other electrode of the holding capacitor 55 is electrically connected to the power supply wiring 61. Alternatively, the holding capacitor 55 can be a capacitor parasitic on the gate electrode of the driving transistor 52, or it can be a capacitor formed by sandwiching an insulating layer on the substrate 14 using mutually different conductive layers.

[0050] In the pixel circuit configured as described above, when the scan signal GWR(i) supplied to the scan line 31 of the i-th row is high, the selection transistor 51 is in the off state. On the other hand, when the scan signal GWR(i) is low, the selection transistor 51 is in the on state. When the selection transistor 51 is in the on state, a charging current flows through the holding capacitor 55 according to the potential difference Vd between the potential of the data line 33 and the potential of the power supply wiring 61, thereby charging the holding capacitor 55 until the voltage between the electrodes of the holding capacitor 55 becomes the potential difference Vd.

[0051] The current flowing between the other side of the source / drain region and one side of the source / drain region of the driving transistor 52 depends on the gate potential of the driving transistor 52. The gate potential of the driving transistor 52 is equal to the voltage held by the holding capacitor 55, i.e., the inter-electrode voltage of the holding capacitor 55. Therefore, a current with a value corresponding to the voltage held by the holding capacitor 55 flows between the other side of the source / drain region and one side of the source / drain region of the driving transistor 52. Hereinafter, the current flowing between the other side of the source / drain region and one side of the source / drain region of the driving transistor 52 will be referred to as the "driving current".

[0052] When the control signal GEL(i) supplied to the control line 32 of row i is high, the light-emitting control transistor 53 is in the off state. When the light-emitting control transistor 53 is in the off state, the anode of the light-emitting element 54 is electrically disconnected from the source / drain region of the driving transistor 52. Therefore, the driving current does not flow through the light-emitting element 54 via the driving transistor 52. That is, when the light-emitting control transistor 53 is in the off state, the light-emitting element 54 does not emit light.

[0053] On the other hand, when the control signal GEL(i) is low, the light-emitting control transistor 53 is in the on state. When the light-emitting control transistor 53 is in the on state, the anode of the light-emitting element 54 becomes electrically connected to the source / drain region of the driving transistor 52 via the light-emitting control transistor 53. Therefore, a drive current having a current value corresponding to the voltage held by the holding capacitor 55 flows through the light-emitting element 54 via the driving transistor 52. That is, when the light-emitting control transistor 53 is in the on state, the light-emitting element 54 emits light with a brightness corresponding to the drive current. The brightness of the light-emitting element 54 varies depending on the value of the drive current, i.e., the voltage held by the holding capacitor 55.

[0054] The controller 6 controls the timing of the level inversion of the scan signal GWR(i), the timing of the level inversion of the control signal GEL(i), and the potential of the data line 33, thereby controlling the brightness and duration of the light emission of the light-emitting element 54 disposed in each pixel 11. As a result, image light L representing a specified image is emitted from the light-emitting display panel 2. The image light L includes visible light (colored light) emitted from the light-emitting element 54 disposed in each pixel 11 of the light-emitting display panel 2.

[0055] Below, return Figure 2 Continuing the explanation, the projection optical system 3, composed of multiple optical elements such as lenses, guides the image light L from the light-emitting display panel 2 to the scanning mirror 4. The projection optical system 3 magnifies and projects the image light L emitted from the light-emitting display panel 2 onto the scanning mirror 4. The scanning mirror 4 reflects the image light L emitted from the light-emitting display panel 2 towards the scanned surface 200, where the scanned surface 200 performs a 2D scan of the reflected image light L. The fθ lens 5 images the image light L reflected by the scanning mirror 4 onto the scanned surface 200. The scanning mirror 4 is positioned at the pupil position of the projection optical system 3. This allows for a reduction in the size of the scanning mirror 4. Furthermore, the scanning mirror 4 is positioned at the entrance pupil position of the fθ lens 5.

[0056] Although Figure 1 and Figure 2 The illustration is omitted, but the scanning mirror 4 in this embodiment is the reflector of the MEMS (MicroElectro Mechanical Systems) scanner 40. Figure 5 This is a schematic diagram illustrating an example of the mechanical structure of a MEMS scanner 40 with a scanning mirror 4. Figure 5 In the image, the left side is a top view of the MEMS scanner 40, and the right side is a cross-sectional view of the MEMS scanner 40 along the AA direction. In addition to the scanning mirror 4, the MEMS scanner 40 also has a pair of torsion bars 41, a mirror support component 42, a base plate 43, and a longitudinal scanning axis 44.

[0057] like Figure 5As shown, the scanning mirror 4 is a quadrilateral plate component with a mirror surface. The scanning mirror 4 is supported by a pair of torsion bars 41 inside a frame-shaped mirror support member 42, allowing it to rotate about the Y-axis. The mirror support member 42 is fixed to the surface of a base plate 43, which is a quadrilateral plate component, and has a predetermined height from the surface of the base plate 43 along the Z-axis direction. That is, the scanning mirror 4 is located at a predetermined height relative to the surface of the base plate 43. A longitudinal scanning shaft 44 extending along the X-axis direction is bonded to the back of the base plate 43. The base plate 43 is supported by the longitudinal scanning shaft 44, allowing it to rotate about the X-axis.

[0058] Although Figure 5 The illustration is omitted, but in the MEMS scanner 40, a coil is arranged along the outer periphery of the scanning mirror 4, and a magnet is arranged to surround the scanning mirror 4. By supplying a drive current from the controller 6 to the coil, the scanning mirror 4 rotates about the Y-axis. That is, the rotation angle of the scanning mirror 4 about the Y-axis is controlled by the controller 6.

[0059] Additionally, the motor (not shown) that rotates the longitudinal scanning axis 44 is controlled by the controller 6, thereby causing the longitudinal scanning axis 44 to rotate. When the longitudinal scanning axis 44 rotates, the base plate 43 rotates around the X-axis, resulting in the scanning mirror 4 also rotating around the X-axis. That is, the controller 6 controls the rotation angle of the scanning mirror 4 around the X-axis.

[0060] Figure 6 This is a schematic diagram illustrating the relationship between the rotation angle θ of the scanning mirror 4 about the Y-axis and the incident position P of the central ray Lc on the scanned surface 200. (See diagram for example.) Figure 6 As shown, the axis perpendicularly connecting the center of the scanning mirror 4 and the scanned surface 200 is taken as the reference axis AX, and the intersection of the reference axis AX and the scanned surface 200 is taken as the origin position P0. The reference axis AX is aligned with the optical axis of the fθ lens 5. Furthermore, the ray in the image light L that is parallel to the X-axis and incident on the center of the scanning mirror 4 is taken as the central ray Lc.

[0061] When the tilt angle of the scanning mirror 4 relative to the X-axis is 45°, the central ray Lc reflected by the scanning mirror 4 passes through the reference axis AX and is incident on the origin position P0. Thus, the state in which the scanning mirror 4 is tilted at 45° relative to the X-axis, i.e., the state in which the central ray Lc reflected by the scanning mirror 4 passes through the reference axis AX and is incident on the origin position P0, is called the "reference state".

[0062] like Figure 6As shown, when the scanning mirror 4 rotates clockwise by an angle θ from the reference state around the Y-axis, the central ray Lc reflected by the scanning mirror 4 is incident on position P, which is a distance x (=f×θ) away from the origin P0 in the X-axis direction (+X side). When the scanning mirror 4 rotates clockwise by a maximum angle θmax from the reference state around the Y-axis, the central ray Lc reflected by the scanning mirror 4 is incident on position P1, which is a distance x (=f×θmax) away from the origin P0 in the X-axis direction (+X side). When the scanning mirror 4 rotates counterclockwise by a maximum angle -θmax from the reference state around the Y-axis, the central ray Lc reflected by the scanning mirror 4 is incident on position P2, which is a distance x (=-f×θmax) away from the origin P0 in the X-axis direction (-X side). Furthermore, f is the focal length of the fθ lens 5.

[0063] As described above, the distance x between the incident position P of the central ray Lc in the X-axis direction and the origin position P0 is proportional to the rotation angle θ of the scanning mirror 4 around the Y-axis, according to the optical characteristics of the fθ lens 5. That is, the moving speed of the incident position P of the central ray Lc in the X-axis direction is proportional to the rotation speed of the scanning mirror 4 around the Y-axis. Thus, the incident position P of the central ray Lc in the X-axis direction moves between positions P1 and P2 according to the rotational motion of the scanning mirror 4 around the Y-axis.

[0064] Figure 7 This schematically illustrates the rotation angle of the scanning mirror 4 about the X-axis. A graph showing the relationship between the incident position P of the central ray Lc on the scanned surface 200 and the incident position P. (See figure) Figure 7 As shown, when the scanning mirror 4 rotates clockwise from the reference state around the X-axis by an angle... At that time, the central ray Lc reflected by the scanning mirror 4 is incident on the upper side (+Y side) of the direction from the origin P0 towards the Y-axis, at a distance of... Position P. When scanning mirror 4 rotates clockwise from the reference state around the X-axis, the maximum rotation angle is... At that time, the central ray Lc reflected by the scanning mirror 4 is incident on the upper side (+Y side) of the direction from the origin P0 towards the Y-axis, at a distance of... Position P3. The scanning mirror 4 rotates counterclockwise from the reference position around the X-axis by the maximum rotation angle. At that time, the central ray Lc reflected by the scanning mirror 4 is incident on the lower side (-Y side) of the direction from the origin P0 towards the Y-axis, at a distance of... Position P4.

[0065] As described above, the distance y between the incident position P of the central ray Lc in the Y-axis direction and the origin position P0 depends on the optical characteristics of the fθ lens 5 and the rotation angle of the scanning mirror 4 around the X-axis. The relationship is proportional. That is, the speed at which the incident position P of the central ray Lc in the Y-axis direction moves is proportional to the rotational speed of the scanning mirror 4 around the X-axis. Thus, the incident position P of the central ray Lc in the Y-axis direction moves between positions P3 and P4 according to the rotational motion of the scanning mirror 4 around the X-axis.

[0066] Summary of Figure 6 and Figure 7 The explanation, such as Figure 8 As shown, the region within the scanned surface 200 has a length of 2f·θmax in the X-axis direction centered at the origin P0, and a length of [missing information] in the Y-axis direction. The rectangular region 210 of length is the scannable region of the scanning mirror 4. Hereinafter, this rectangular region 210 will be referred to as the "scannable region". The incident position P of the central ray Lc moves within the scannable region 210 according to the rotational motion of the scanning mirror 4 about the Y-axis and about the X-axis. In the following description, as described above, the incident position P of the central ray Lc that moves within the scannable region 210 corresponding to the rotational motion of the scanning mirror 4 will be referred to as the "scanning point". Furthermore, in the following description, the rotation angle θ of the scanning mirror 4 about the Y-axis will sometimes be referred to as the "main scanning rotation angle", and the rotation angle θ of the scanning mirror 4 about the X-axis will sometimes be referred to as the "main scanning rotation angle". This is called the "sub-scan rotation angle".

[0067] In this embodiment, the number of pixels m in the vertical direction of the light-emitting display panel 2 is 200, and the number of pixels n in the horizontal direction of the light-emitting display panel 2 is 200. Therefore, when the image light L emitted from the light-emitting display panel 2 is reflected by the scanning mirror 4 toward the scanned surface 200, the image light L is projected onto an area in the in-plane region of the scanned surface 200 that has a length equivalent to 200 pixels in the X-axis direction and a length equivalent to 200 pixels in the Y-axis direction, centered at the scanning point P (see reference). Figure 1 In this way, by projecting image light L onto the area centered on the scanning point P, an image with a size of 200 pixels × 200 pixels is formed on the scanned surface 200, centered on the scanning point P.

[0068] The controller 6 controls the light-emitting display panel 2 and the scanning mirror 4. Specifically, the controller 6 controls the rotation of the scanning mirror 4 in such a way that the scanning point P on the scanned surface 200 moves along a predetermined scanning path SR, and controls the light-emitting display panel 2 to emit image light L when the scanning point P reaches each of the plurality of image display points set on the scanning path SR.

[0069] Figure 9This diagram illustrates an example of a scan path SR set within the scannable area 210 of the scanned surface 200. The scan path SR is the path through which scan point P sequentially passes through image display points P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, and P21. Image display points P10, P11, P12, and P13 are arranged in this order from left to right along the X-axis, and are spaced at intervals equivalent to 200 pixels along the X-axis.

[0070] Image display points P14, P15, P16, and P17 are arranged in a column from right to left along the X-axis in this order, and are spaced at intervals of approximately 200 pixels along the X-axis. The group of points containing image display points P14, P15, P16, and P17 is positioned 200 pixels below the group of points containing image display points P10, P11, P12, and P13 along the Y-axis.

[0071] Image display points P18, P19, P20, and P21 are arranged in a column from left to right along the X-axis in this order, and are spaced at intervals of approximately 200 pixels along the X-axis. The group of points containing image display points P18, P19, P20, and P21 is positioned 200 pixels below the group of points containing image display points P14, P15, P16, and P17 along the Y-axis.

[0072] The controller 6 controls the rotation of the scanning mirror 4 such that the scanning point P moves at a constant speed within the interval between two adjacent image display points along the scanning path SR set as described above, and stops for a predetermined time upon reaching the image display point. This controls the emission display panel 2 to emit image light L during the predetermined time that the scanning point P stops at the image display point. Furthermore, the controller 6 divides the input image 100 into multiple sub-images, controlling the emission display panel 2 to emit image light L representing the sub-image corresponding to the reached image display point when the scanning point P reaches each of the multiple image display points set along the scanning path SR. In the following description, the mode in which the controller 6 coordinates the control of the scanning mirror 4 and the emission display panel 2 as described above is referred to as the "stepping scan mode." The operation of the controller 6 in the stepping scan mode will be described in detail below.

[0073] Figure 10 This diagram illustrates an example of an input image 100, showing images of various vegetables. The input image 100 is the image that should be displayed on the scanned surface 200 during one frame. The controller 6 acquires the input image 100 that should be displayed on the scanned surface 200 during one frame based on an image signal input from outside the projection device 1. After acquiring the input image 100 from the image signal, the controller 6... Figure 10As shown, the input image 100 is divided into 12 sub-images: 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, and 121.

[0074] Sub-image 110 is the sub-image corresponding to image display point P10. Sub-image 111 is the sub-image corresponding to image display point P11. Sub-image 112 is the sub-image corresponding to image display point P12. Sub-image 113 is the sub-image corresponding to image display point P13. Sub-image 114 is the sub-image corresponding to image display point P14. Sub-image 115 is the sub-image corresponding to image display point P15. Sub-image 116 is the sub-image corresponding to image display point P16. Sub-image 117 is the sub-image corresponding to image display point P17. Sub-image 118 is the sub-image corresponding to image display point P18. Sub-image 119 is the sub-image corresponding to image display point P19. Sub-image 120 is the sub-image corresponding to image display point P20. Sub-image 121 is the sub-image corresponding to image display point P21.

[0075] The controller 6 performs compression or decompression processing on each sub-image as needed, so that the size of each sub-image is 200 pixels × 200 pixels.

[0076] After dividing the input image 100 into 12 sub-images, the controller 6 adjusts the main scanning rotation angle θ and the sub-scanning rotation angle of the scanning mirror 4. Feedback control is performed to move the scan point P to the initial image display point P10 of the scan path SR. Then, the controller 6 controls the scanning mirror 4 such that the scan point P stops at the image display point P10 for a predetermined time when the scan point P reaches the image display point P10, and controls the light-emitting display panel 2 such that image light L representing the sub-image 110 corresponding to the image display point P10 is emitted during the predetermined time when the scan point P stops at the image display point P10.

[0077] Figure 11 This is a timing diagram showing the time-dependent relationship between the X-axis position of the scan point P and the emission amount of the light-emitting display panel 2 in step scan mode. Figure 11 In this context, the position of the scan point P in the X-axis direction is represented by the number of pixels relative to the image display point P10. For example... Figure 11 As shown, when the scanning point P reaches the image display point P10 at time t0, the scanning point P stops at the image display point P10 until time t1 arrives. The time from time t0 to time t1 is a predetermined time. During the predetermined time period from time t0 to time t1, image light L representing the sub-image 110 corresponding to the image display point P10 is emitted from the light-emitting display panel 2. As a result, as... Figure 12As shown, within a specified time period from time t0 to time t1, a sub-image 110 with a size of 200×200 pixels centered on the image display point P10 is formed on the scanned surface 200.

[0078] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P10, the controller 6, after turning off the light-emitting display panel 2, performs feedback control on the main scanning rotation angle θ of the scanning mirror 4, so that the scanning point P moves at a constant speed along the scanning path SR between the image display point P10 and the next image display point P11. Figure 11 As shown, when the scanning point P reaches time t1 after a predetermined time while the image display point P10 is stationary, the scanning point P moves at a constant high speed along the X-axis from the image display point P10 to the next image display point P11. During the period when the scanning point P moves from the image display point P10 to the next image display point P11, the light emission of the light-emitting display panel 2 is zero.

[0079] The controller 6 controls the scanning mirror 4 such that when the scanning point P reaches the image display point P11, the scanning point P stops at the image display point P11 for a predetermined time, and controls the light-emitting display panel 2 such that during the predetermined time when the scanning point P stops at the image display point P11, it emits image light L representing the sub-image 111 corresponding to the image display point P11.

[0080] like Figure 11 As shown, when the scanning point P reaches the image display point P11 at time t2, the scanning point P stops at the image display point P11 until time t3 arrives. The time from time t2 to time t3 is a predetermined time. Furthermore, during the predetermined time from time t2 to time t3, image light L representing the sub-image 111 corresponding to the image display point P11 is emitted from the light-emitting display panel 2. As a result, as... Figure 12 As shown, during the specified time from time t2 to time t3, a sub-image 111 centered on the image display point P11 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200.

[0081] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P11, the controller 6, after turning off the light-emitting display panel 2, performs feedback control on the main scanning rotation angle θ of the scanning mirror 4, so that the scanning point P moves at a constant speed along the scanning path SR between the image display point P11 and the next image display point P12. Figure 11As shown, when the scanning point P reaches time t3 after a predetermined time while the image display point P11 is stationary, the scanning point P moves at a constant high speed along the X-axis from the image display point P11 towards the next image display point P12. During the period when the scanning point P moves from the image display point P11 to the next image display point P12, the light emission of the light-emitting display panel 2 is zero.

[0082] The controller 6 controls the scanning mirror 4 such that when the scanning point P reaches the image display point P12, the scanning point P stops at the image display point P12 for a predetermined time, and controls the light-emitting display panel 2 such that during the predetermined time when the scanning point P stops at the image display point P12, it emits image light L representing the sub-image 112 corresponding to the image display point P12.

[0083] like Figure 11 As shown, when the scanning point P reaches the image display point P12 at time t4, the scanning point P stops at the image display point P12 until time t5 arrives. The time from time t4 to time t5 is a predetermined time. Furthermore, during the predetermined time from time t4 to time t5, image light L representing the sub-image 112 corresponding to the image display point P12 is emitted from the light-emitting display panel 2. As a result, as... Figure 12 As shown, during the specified time from time t4 to time t5, a sub-image 112 centered on image display point P12 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200.

[0084] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P12, the controller 6, after turning off the light-emitting display panel 2, performs feedback control on the main scanning rotation angle θ of the scanning mirror 4, so that the scanning point P moves at a constant speed along the scanning path SR between the image display point P12 and the next image display point P13. Figure 11 As shown, when the scanning point P reaches time t5 after a predetermined time while the image display point P12 is stationary, the scanning point P moves at a constant high speed along the X-axis from the image display point P12 toward the next image display point P13. During the period when the scanning point P moves from the image display point P12 to the next image display point P13, the light emission of the light-emitting display panel 2 is zero.

[0085] The controller 6 controls the scanning mirror 4 such that when the scanning point P reaches the image display point P13, the scanning point P stops at the image display point P13 for a predetermined time, and controls the light-emitting display panel 2 such that during the predetermined time when the scanning point P stops at the image display point P13, it emits image light L representing the sub-image 113 corresponding to the image display point P13.

[0086] like Figure 11As shown, when the scanning point P reaches the image display point P13 at time t6, the scanning point P stops at the image display point P13 until time t7 arrives. The time from time t6 to time t7 is a predetermined time. Furthermore, during the predetermined time from time t6 to time t7, image light L representing the sub-image 113 corresponding to the image display point P13 is emitted from the light-emitting display panel 2. As a result, as... Figure 12 As shown, during the specified time from time t6 to time t7, a sub-image 113 centered on image display point P13 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200.

[0087] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P13, and after the light-emitting display panel 2 has been turned off, the controller 6 adjusts the sub-scanning rotation angle of the scanning mirror 4. Feedback control is performed to ensure that the scanning point P moves at a constant speed along the scanning path SR between image display point P13 and the next image display point P14. The controller 6 controls the scanning mirror 4 such that when the scanning point P reaches image display point P14, it stops at image display point P14 for a predetermined time, and controls the light-emitting display panel 2 such that during the predetermined time that the scanning point P stops at image display point P14, it emits image light L representing the sub-image 114 corresponding to image display point P14. As a result, as... Figure 12 As shown, within a specified time when the scanning point P stops at the image display point P14, a sub-image 114 with a size of 200×200 pixels centered on the image display point P14 is formed on the scanned surface 200.

[0088] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P14, and after the light-emitting display panel 2 has been turned off, the controller 6 performs feedback control on the main scanning rotation angle θ of the scanning mirror 4, so that the scanning point P moves at a constant speed between the image display point P14 and the next image display point P15 in the scanning path SR. The controller 6 controls the scanning mirror 4 such that the scanning point P stops at the image display point P15 for a predetermined time when it reaches the image display point P15, and controls the light-emitting display panel 2 such that the image light L representing the sub-image 115 corresponding to the image display point P15 is emitted during the predetermined time that the scanning point P stops at the image display point P15. As a result, as Figure 12 As shown, within a specified time during which the scanning point P stops at the image display point P15, a sub-image 115 centered at the image display point P15 and having a size of 200×200 pixels is formed on the scanned surface 200.

[0089] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P15, and after the light-emitting display panel 2 has been turned off, the controller 6 performs feedback control on the main scanning rotation angle θ of the scanning mirror 4, so that the scanning point P moves at a constant speed within the interval between the image display point P15 and the next image display point P16 in the scanning path SR. The controller 6 controls the scanning mirror 4 such that the scanning point P stops at the image display point P16 for a predetermined time when it reaches the image display point P16, and controls the light-emitting display panel 2 such that image light L representing the sub-image 116 corresponding to the image display point P16 is emitted during the predetermined time that the scanning point P stops at the image display point P16. As a result, as Figure 12 As shown, within a specified time when the scanning point P stops at the image display point P16, a sub-image 116 with a size of 200×200 pixels centered on the image display point P16 is formed on the scanned surface 200.

[0090] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P16, and after the light-emitting display panel 2 has been turned off, the controller 6 performs feedback control on the main scanning rotation angle θ of the scanning mirror 4, so that the scanning point P moves at a constant speed along the scanning path SR between the image display point P16 and the next image display point P17. The controller 6 controls the scanning mirror 4 such that when the scanning point P reaches the image display point P17, the scanning point P stops at the image display point P17 for a predetermined time, and controls the light-emitting display panel 2 such that during the predetermined time that the scanning point P stops at the image display point P17, it emits image light L representing the sub-image 117 corresponding to the image display point P17. As a result, as Figure 12 As shown, within a specified time during which the scanning point P stops at the image display point P17, a sub-image 117 centered on the image display point P17 and having a size of 200×200 pixels is formed on the scanned surface 200.

[0091] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P17, and after the light-emitting display panel 2 has been turned off, the controller 6 adjusts the sub-scanning rotation angle of the scanning mirror 4. Feedback control is implemented to ensure that the scanning point P moves at a constant speed along the scanning path SR between image display point P17 and the next image display point P18. The controller 6 controls the scanning mirror 4 such that when the scanning point P reaches image display point P18, it stops at image display point P18 for a predetermined time, and controls the light-emitting display panel 2 such that it emits image light L representing the sub-image 118 corresponding to image display point P18 during the predetermined time the scanning point P stops at image display point P18. As a result, as... Figure 12As shown, within a specified time when the scanning point P stops at the image display point P18, a sub-image 118 with a size of 200×200 pixels centered on the image display point P18 is formed on the scanned surface 200.

[0092] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P18, and after the light-emitting display panel 2 has been turned off, the controller 6 performs feedback control on the main scanning rotation angle θ of the scanning mirror 4, so that the scanning point P moves at a constant speed along the scanning path SR between the image display point P18 and the next image display point P19. The controller 6 controls the scanning mirror 4 such that when the scanning point P reaches the image display point P19, it stops at the image display point P19 for a predetermined time, and controls the light-emitting display panel 2 such that during the predetermined time that the scanning point P stops at the image display point P19, it emits image light L representing the sub-image 119 corresponding to the image display point P19. As a result, as... Figure 12 As shown, within a specified time during which the scanning point P stops at the image display point P19, a sub-image 119 centered on the image display point P19 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200.

[0093] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P19, and after the light-emitting display panel 2 has been turned off, the controller 6 performs feedback control on the main scanning rotation angle θ of the scanning mirror 4, so that the scanning point P moves at a constant speed along the scanning path SR between the image display point P19 and the next image display point P20. The controller 6 controls the scanning mirror 4 such that when the scanning point P reaches the image display point P20, the scanning point P stops at the image display point P20 for a predetermined time, and controls the light-emitting display panel 2 such that during the predetermined time that the scanning point P stops at the image display point P20, it emits image light L representing the sub-image 120 corresponding to the image display point P20. As a result, as... Figure 12 As shown, within a specified time during which the scanning point P stops at the image display point P20, a sub-image 120 centered at the image display point P20 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200.

[0094] After a predetermined time has elapsed since the scanning point P has stopped at the image display point P20, and after the light-emitting display panel 2 has been turned off, the controller 6 performs feedback control on the main scanning rotation angle θ of the scanning mirror 4, so that the scanning point P moves at a constant speed along the scanning path SR between the image display point P20 and the next image display point P21. The controller 6 controls the scanning mirror 4 such that when the scanning point P reaches the image display point P21, the scanning point P stops at the image display point P21 for a predetermined time, and controls the light-emitting display panel 2 such that during the predetermined time that the scanning point P stops at the image display point P21, it emits image light L representing the sub-image 121 corresponding to the image display point P21. As a result, as Figure 12 As shown, within a specified time during which the scanning point P stops at the image display point P21, a sub-image 121 centered on the image display point P21 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200.

[0095] As described above, whenever the scan point P reaches one of the 12 image display points set on the scan path SR, the above actions are performed, and the image that is ultimately seen by the user as the same as the input image 100 is displayed on the scanned surface 200. Furthermore, the above series of actions are performed within one frame.

[0096] like Figure 13 As shown, due to the precision of the feedback control of the scanning mirror 4, for example, the center of the sub-image 111 adjacent to the right of sub-image 110 may become a point P11' offset to the right by a distance d from the image display point P11 set on the scanning path SR. In this case, a gap with a width d is generated between the adjacent sub-images 110 and 111. Thus, the gap generated between a pair of adjacent sub-images may be perceived by the user as an image defect such as a bright line or dark line.

[0097] Therefore, when the controller 6 segments the input image 100 into multiple sub-images, adjacent pairs of sub-images in the segmented input image 100 have overlapping regions that are mutually overlapping areas. For example... Figure 14 As shown, for example, when focusing on a pair of adjacent sub-images 110 and 111, the input image 100 is segmented into sub-image 110 having an overlapping region 110a and sub-image 111 having an overlapping region 111a. The widths of the overlapping regions 110a and 111a are preferably set to a value equal to the maximum value of the offset d of the image display point. For example, when the maximum value of the offset d of the image display point is equivalent to a length of 5 pixels, the widths of the overlapping regions 110a and 111a are also set to a length equivalent to 5 pixels (see reference). Figure 14 ).

[0098] like Figure 15As shown in the figure above, on the scanned surface 200, when the center of the sub-image 111 adjacent to the right side of sub-image 110 coincides with the image display point P11 set on the scan path SR, the overlapping region 110a of sub-image 110 and the overlapping region 111a of sub-image 111 completely overlap. In this case, the boundaries of sub-image 110 and sub-image 111 are connected without image offset and are observed by the user as the same image as the input image 100.

[0099] On the other hand, such as Figure 15 As shown in the figure below, even if the center of the sub-image 111 adjacent to the right of sub-image 110 is a point P11' offset 5 pixels to the right from the image display point P11 set on the scan path SR, no gap is generated between sub-image 110 and sub-image 111. In this case, image shift occurs near the boundary between the overlapping area 110a of sub-image 110 and the overlapping area 111a of sub-image 111, but the image shift will not reach the extent that the user perceives.

[0100] In this way, by using the overlapping region, which is the region where adjacent pairs of sub-images overlap, gaps between adjacent pairs of sub-images can be prevented.

[0101] When the overlapping region 110a of sub-image 110 partially or completely overlaps with the overlapping region 111a of sub-image 111, the brightness of the overlapping region becomes twice that of the overlapping region. This increase in brightness in the overlapping region may be perceived by the user as a brightness deviation. Therefore, in this embodiment, as... Figure 16 As shown, in sub-image 110, the brightness of sub-image 110 is set such that the brightness gradually decreases from the boundary between the overlapping region 110a and other regions toward the edge of the overlapping region 110a. Similarly, in sub-image 111, the brightness of sub-image 111 is set such that the brightness gradually decreases from the boundary between the overlapping region 111a and other regions toward the edge of the overlapping region 111a. Therefore, even if the overlapping regions 110a of sub-image 110 and 111a of sub-image 111 partially or completely overlap, the brightness of the overlapping portions is averaged, preventing brightness deviations from being perceived by the user.

[0102] In the above description of the overlapping region, attention was focused on the horizontally adjacent sub-images 110 and 111. However, it is certainly preferable to set overlapping regions in all adjacent pairs of sub-images. For example, overlapping regions can also be set in the vertically adjacent sub-images 110 and 117. For example, in the case of sub-image 116, overlapping regions can be set for the vertically and horizontally adjacent sub-images 111, 115, 117, and 119, respectively.

[0103] In addition to the step scanning mode described above, the controller 6 can also coordinate the control of the scanning mirror 4 and the light-emitting display panel 2 in a continuous scanning mode. In continuous scanning mode, the controller 6 controls the rotation of the scanning mirror 4 such that the scanning point P moves at a constant speed along the scanning path SR, and controls the light-emitting display panel 2 to emit image light L representing the sub-image corresponding to each of the multiple image display points set on the scanning path SR. The operation of the controller 6 in continuous scanning mode will be explained in detail below.

[0104] like Figure 17 As shown, the scan path SR in continuous scan mode is the path that scan point P traverses in the order of image display points P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, and P21. Unlike step scan mode, the scan path SR in continuous scan mode is sinusoidal and zigzag. Therefore, as scan point P moves along the scan path SR, the position of the image display point gradually decreases.

[0105] After acquiring the input image 100 from the image signal, the controller 6 divides the input image 100 into 12 sub-images: 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, and 121. (For example...) Figure 17 As shown, after the controller 6 divides the input image 100 into 12 sub-images, it adjusts the main scanning rotation angle θ and the sub-scanning rotation angle of the scanning mirror 4. Feedback control is implemented to move the scan point P to the starting point Ps of the scan path SR. After the scan point P reaches the starting point, the controller 6 causes the scanning mirror 4 to rotate at a constant speed so that the scan point P moves at a constant speed on the scan path SR.

[0106] Then, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 110 corresponding to the image display point P10 when the scanning point P reaches the image display point P10. Thus, at the precise timing of the scanning point P reaching the image display point P10, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 110 corresponding to the image display point P10. As a result, as... Figure 17 As shown, a sub-image 110 with a size of 200×200 pixels and centered at image display point P10 is formed on the scanned surface 200 in a very short time.

[0107] Next, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 111 corresponding to the image display point P11 when the scanning point P reaches the image display point P11. Thus, at the precise timing of the scanning point P reaching the image display point P11, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 111 corresponding to the image display point P11. As a result, as... Figure 17 As shown, a sub-image 111 with a size of 200 pixels × 200 pixels and centered at image display point P11 is formed on the scanned surface 200 in a very short time.

[0108] Next, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 112 corresponding to the image display point P12 when the scanning point P reaches the image display point P12. Thus, at the precise timing of the scanning point P reaching the image display point P12, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 112 corresponding to the image display point P12. As a result, as... Figure 17 As shown, a sub-image 112 centered at image display point P12 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200 in a very short time.

[0109] Next, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 113 corresponding to the image display point P13 when the scanning point P reaches the image display point P13. Thus, at the precise timing of the scanning point P reaching the image display point P13, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 113 corresponding to the image display point P13. As a result, as... Figure 17 As shown, a sub-image 113 centered at image display point P13 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200 in a very short time.

[0110] Next, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 114 corresponding to the image display point P14 when the scanning point P reaches the image display point P14. Thus, at the precise timing of the scanning point P reaching the image display point P14, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 114 corresponding to the image display point P14. As a result, as... Figure 17 As shown, a sub-image 114 centered on image display point P14 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200 in a very short time.

[0111] Next, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 115 corresponding to the image display point P15 when the scanning point P reaches the image display point P15. Thus, at the precise timing of the scanning point P reaching the image display point P15, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 115 corresponding to the image display point P15. As a result, as... Figure 17 As shown, a sub-image 115 centered at image display point P15 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200 in a very short time.

[0112] Next, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 116 corresponding to the image display point P16 when the scanning point P reaches the image display point P16. Thus, at the precise timing of the scanning point P reaching the image display point P16, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 116 corresponding to the image display point P16. As a result, as... Figure 17 As shown, a sub-image 116 centered at image display point P16 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200 in a very short time.

[0113] Next, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 117 corresponding to the image display point P17 when the scanning point P reaches the image display point P17. Thus, at the precise timing of the scanning point P reaching the image display point P17, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 117 corresponding to the image display point P17. As a result, as... Figure 17 As shown, a sub-image 117 centered at image display point P17 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200 in a very short time.

[0114] Next, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 118 corresponding to the image display point P18 when the scanning point P reaches the image display point P18. Thus, at the precise timing of the scanning point P reaching the image display point P18, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 118 corresponding to the image display point P18. As a result, as... Figure 17 As shown, a sub-image 118 centered at image display point P18 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200 in a very short time.

[0115] Next, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 119 corresponding to the image display point P19 when the scanning point P reaches the image display point P19. Thus, at the precise timing of the scanning point P reaching the image display point P19, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 119 corresponding to the image display point P19. As a result, as... Figure 17 As shown, a sub-image 119 centered at image display point P19 and having a size of 200 pixels × 200 pixels is formed on the scanned surface 200 in a very short time.

[0116] Next, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 120 corresponding to the image display point P20 when the scanning point P reaches the image display point P20. Thus, at the precise timing of the scanning point P reaching the image display point P20, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 120 corresponding to the image display point P20. As a result, as... Figure 17 As shown, a sub-image 120 with a size of 200 pixels × 200 pixels and centered at image display point P20 is formed on the scanned surface 200 in a very short time.

[0117] Finally, the controller 6 controls the light-emitting display panel 2 to emit image light L representing the sub-image 121 corresponding to the image display point P21 when the scanning point P reaches the image display point P21. Thus, at the precise timing of the scanning point P reaching the image display point P21, the light-emitting display panel 2 instantaneously emits image light L representing the sub-image 121 corresponding to the image display point P21. As a result, as... Figure 17 As shown, a sub-image 121 with a size of 200 pixels × 200 pixels and centered at image display point P21 is formed on the scanned surface 200 in a very short time.

[0118] As described above, whenever scan point P reaches each of the 12 image display points set on the scan path SR, the aforementioned action is performed to display the image that will ultimately be seen by the user on the scanned surface 200. However, as Figure 17 As shown, in continuous scanning mode, as the scan point P advances along the scan path SR, the position of the image display point gradually decreases. Therefore, as the scan point P advances along the scan path SR, the sub-images formed at each image display point also gradually decrease. Consequently, the image ultimately displayed on the scanned surface 200 may be seen by the user as a different image from the input image 100. Therefore, in continuous scanning mode, image processing for each sub-image is performed considering the aforementioned image offset. Furthermore, in continuous scanning mode, overlapping regions are also set in each sub-image.

[0119] Figure 18This is a diagram showing the correspondence between the X-direction position of the scanning point P, the main scanning rotation angle θ of the scanning mirror 4, and the amount of light emitted by the light-emitting display panel 2 in continuous scanning mode. Figure 18 In this context, the position of scan point P within the interval from the starting point Ps to the image display point P13 is represented by the number of pixels relative to the starting point Ps. For example... Figure 18 As shown, in continuous scanning mode, when the scanning point P reaches the image display points P10, P11, P12, and P13 respectively, a very high luminous intensity is required to instantly illuminate the light-emitting display panel 2. Compared to step scanning mode, continuous scanning mode requires several hundred times more luminous intensity to illuminate the light-emitting display panel 2 (see reference). Figure 11 Furthermore, compared to displaying images using existing dot-scan methods, continuous scan mode requires an emission level several times that of approximately one pixel to illuminate the light-emitting display panel 2 (see reference). Figure 18 Therefore, in continuous scanning mode, high-speed driving of the light-emitting display panel 2 is required, and a high-output light-emitting element 54 is also needed.

[0120] As explained above, in the projection device 1 of this embodiment, the image light L emitted from the light-emitting display panel 2, which has 200 pixels × 200 pixels, is reflected onto the scanned surface 200 by the scanning mirror 4 for 2D scanning. Thus, an image that is seen by the user as the same as the input image 100 is displayed on the scanned surface 200. According to this embodiment, for example, when displaying a 4K image, the number of horizontal scans (i.e., the horizontal scan frequency) can be reduced to 1 / 200 compared to conventional point scanning methods. Furthermore, for example, if the vertical pixel count of the light-emitting display panel 2 is increased, the horizontal scan frequency can be reduced inversely proportionally.

[0121] Furthermore, the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0122] For example, it can also be done by using Figure 19 The MEMS scanner 70 shown implements the step-scanning mode operation through its mechanical structure. Figure 19 In the image, the left side is a top view of the MEMS scanner 70, and the right side is a BB-direction sectional view of the MEMS scanner 70. In addition to the scanning mirror 4, the MEMS scanner 70 also has a pair of first torsion bars 71, a rotating frame 72, a pair of second torsion bars 73, a mirror support component 74, a base plate 75, and a longitudinal scanning axis 76.

[0123] like Figure 19As shown, the scanning mirror 4 is supported inside the frame-shaped plate member, i.e., the rotating frame 72, by a pair of first torsion bars 71, enabling it to rotate about the Y-axis. The rotating frame 72 is supported inside the frame-shaped mirror support member 74 by a pair of second torsion bars 73, enabling it to rotate about the Y-axis. The mirror support member 74 is fixed to the surface of the base plate 75, which is a quadrilateral plate member, and has a predetermined height from the surface of the base plate 75 along the Z-axis direction. That is, the scanning mirror 4 and the rotating frame 72 are located at a predetermined height from the surface of the base plate 75. A longitudinal scanning axis 76 extending along the X-axis direction is bonded to the back of the base plate 75. The base plate 75 is supported by the longitudinal scanning axis 76, enabling it to rotate about the X-axis.

[0124] Although Figure 19 The illustration is omitted, but in the MEMS scanner 70, coils are arranged along the outer periphery of the scanning mirror 4 and the rotating frame 72, and magnets are arranged to surround the scanning mirror 4 and the rotating frame 72. By supplying drive current to each coil from the controller 6, the scanning mirror 4 and the rotating frame 72 rotate about the Y-axis. That is, the rotation angle of the scanning mirror 4 and the rotating frame 72 about the Y-axis is controlled by the controller 6.

[0125] In the following description, the rotation angle of the scanning mirror 4 relative to the rotating frame 72 about the Y-axis is referred to as the "mirror rotation angle θ1", and the rotation angle of the rotating frame 72 relative to the base plate 75 about the Y-axis is referred to as the "frame rotation angle θ2". As will be described later, the rotation angle θ of the scanning mirror 4 relative to the base plate 75 about the Y-axis (main scanning rotation angle θ) is the sum of the mirror rotation angle θ1 and the frame rotation angle θ2. The mirror rotation angle θ1 varies with a relatively small deviation of about ±5 degrees. The frame rotation angle θ2 varies with a relatively large deviation of about ±50 degrees.

[0126] Additionally, a motor (not shown) that rotates the longitudinal scanning axis 76 is controlled by a controller 6, thereby causing the longitudinal scanning axis 76 to rotate. When the longitudinal scanning axis 76 rotates, the base plate 75 rotates around the X-axis, resulting in the scanning mirror 4 also rotating around the X-axis. That is, the controller 6 controls the rotation angle (sub-scanning rotation angle) of the scanning mirror 4 around the X-axis. ).

[0127] Figure 20 This diagram schematically illustrates the situation where the scanning mirror 4 rotates periodically during the continuous rotation of the rotating frame 72. Figure 21 This is a timing diagram showing the time correspondence between the mirror rotation angle θ1, the frame rotation angle θ2, and the main scan rotation angle θ. Figure 20 Show Figure 21 The states of the scanning mirror 4 and the rotating frame 72 at each of the times ta, tb, tc, td, te and tf are shown.

[0128] like Figure 20 and Figure 21As shown, at time ta, the rotating frame 72 rotates counterclockwise by 5 degrees relative to the base plate 75, and the scanning mirror 4 rotates clockwise by 5 degrees relative to the rotating frame 72. At this time ta, the mirror rotation angle θ1 is 5 degrees, and the frame rotation angle θ2 is -5 degrees. Therefore, the sum of the mirror rotation angle θ1 and the frame rotation angle θ2, i.e., the main scanning rotation angle θ, is 0 degrees.

[0129] From the state at time ta, the rotating frame 72 rotates clockwise relative to the base plate 75, and the scanning mirror 4 rotates counterclockwise relative to the rotating frame 72 by the same angle, becoming the state at time tb. At time tb, the rotating frame 72 is parallel to the base plate 75, and the scanning mirror 4 is also parallel to the rotating frame 72. At this state, the mirror rotation angle θ1 and the frame rotation angle θ2 are both 0 degrees; therefore, the sum of the mirror rotation angle θ1 and the frame rotation angle θ2, i.e., the main scanning rotation angle θ, is also 0 degrees.

[0130] Starting from the state at time tb, the rotating frame 72 rotates clockwise relative to the base plate 75, and the scanning mirror 4 rotates counterclockwise relative to the rotating frame 72 by the same angle, becoming the state at time tc. At time tc, the rotating frame 72 rotates 5 degrees clockwise relative to the base plate 75, and the scanning mirror 4 rotates 5 degrees counterclockwise relative to the rotating frame 72. At time tc, the mirror rotation angle θ1 is -5 degrees, and the frame rotation angle θ2 is 5 degrees. Therefore, the sum of the mirror rotation angle θ1 and the frame rotation angle θ2, i.e., the main scanning rotation angle θ, is 0 degrees.

[0131] Thus, during the period from time ta to time tc, the scanning mirror 4 and the rotating frame 72 rotate in opposite directions at the same angle, so the main scanning rotation angle θ remains at 0 degrees.

[0132] Starting from time tc, the rotating frame 72 rotates 5 degrees clockwise relative to the base plate 75, and the scanning mirror 4 rotates 5 degrees clockwise relative to the rotating frame 72, reaching the state at time td. At time td, the rotation angles θ1 and θ2 of the reflecting mirror and the frame are both 5 degrees. Therefore, the sum of the rotation angles θ1 and θ2, i.e., the main scanning rotation angle θ, is 10 degrees. Thus, in the extremely short time from time tc to time td, the emission direction of the reflected light from the scanning mirror 4 rotates instantaneously by 20 degrees.

[0133] At time te, the rotating frame 72 rotates clockwise by 10 degrees relative to the base plate 75, and the scanning mirror 4 rotates counterclockwise by 0 degrees relative to the rotating frame 72. At this time te, the mirror rotation angle θ1 is 0 degrees, and the frame rotation angle θ2 is 10 degrees. Therefore, the sum of the mirror rotation angle θ1 and the frame rotation angle θ2, i.e., the main scanning rotation angle θ, is 10 degrees.

[0134] At time tf, the rotating frame 72 rotates clockwise by 15 degrees relative to the base plate 75, and the scanning mirror 4 rotates counterclockwise by -5 degrees relative to the rotating frame 72. At time tf, the mirror rotation angle θ1 is -5 degrees, and the frame rotation angle θ2 is 15 degrees. Therefore, the sum of the mirror rotation angle θ1 and the frame rotation angle θ2, i.e., the main scanning rotation angle θ, is 10 degrees. Thus, from time td to time tf, the scanning mirror 4 and the rotating frame 72 rotate in opposite directions at the same angle, therefore, the main scanning rotation angle θ remains at 10 degrees.

[0135] By repeating the above actions from time ta to time tf, the step-scanning mode can be implemented on the mechanical structure.

[0136] Additionally, for example, such as Figure 22 As shown, the step-scanning mode can also be achieved mechanically by combining the scanning mirror 4 and the polygon mirror 7. The image light L incident on the scanning mirror 4 is reflected by the scanning mirror 4 towards any one of the multiple mirrors disposed on the outer periphery of the polygon mirror 7. The image light L incident from the scanning mirror 4 onto the mirror of the polygon mirror 7 is reflected by the mirror of the polygon mirror 7 towards the scanned surface 200.

[0137] By rotating the scanning mirror 4 and the polygonal mirror 7 clockwise, the angle between the mirror surface of the polygonal mirror 7 and the mirror surface of the scanning mirror 4 remains constant. Simultaneously, as the scanning mirror 4 and the polygonal mirror 7 rotate, the emission direction of the image light L remains unchanged. Figure 22 In the diagram, states A, B, and C represent the states of the image light L reflected by mirror 7a of the polygon mirror 7, and states D, E, and F represent the states of the image light L reflected by mirror 7b of the polygon mirror 7.

[0138] As the polygon mirror 7 rotates, its mirror surfaces 7a and 7b tilt periodically. During the periodic tilting of mirror surfaces 7a and 7b, the emission direction of the image light L remains unchanged. Furthermore, since the scanning mirror 4 also rotates during the rotation of the polygon mirror 7, the emission direction of the image light L changes in a step-like manner.

[0139] By repeating the actions from state A to state F as described above, the step-scanning mode can be implemented on the mechanical structure.

[0140] The projection device of one aspect of the present invention may also have the following structure.

[0141] One aspect of the projection device of the present invention comprises: a light-emitting display panel having a plurality of pixels having light-emitting elements arranged in a matrix; a scanning mirror that reflects image light emitted from the light-emitting display panel toward a scanned surface and scans the reflected image light in two dimensions on the scanned surface; and a projection optical system that guides the image light from the light-emitting display panel to the scanning mirror.

[0142] One aspect of the projection device of the present invention includes a control unit that controls the light-emitting display panel and the scanning mirror. The control unit controls the rotational movement of the scanning mirror such that a scanning point on the scanned surface moves along a predetermined scanning path, and controls the light-emitting display panel such that image light is emitted when the scanning point reaches each of a plurality of image display points set on the scanning path.

[0143] In one aspect of the projection device of the present invention, the control unit controls the rotation of the scanning mirror such that the scanning point moves at a constant speed within a range of two adjacent image display points and stops at the image display point for a predetermined time, and controls the light-emitting display panel such that the image light is emitted from the scanning point during the predetermined time when the scanning point stops at the image display point.

[0144] In one aspect of the projection device of the present invention, the control unit controls the rotational motion of the scanning mirror in such a way that the scanning point moves at a constant speed on the scanning path, and controls the light-emitting display panel to emit image light when the scanning point reaches each of the plurality of image display points set on the scanning path.

[0145] In one aspect of the projection device of the present invention, the control unit divides the input image into a plurality of sub-images such that when the scanning point reaches each of the plurality of image display points set on the scanning path, the control unit controls the light-emitting display panel to emit image light representing the sub-image corresponding to the reached image display point.

[0146] In one aspect of the projection apparatus of the present invention, adjacent pairs of sub-images among a plurality of said sub-images have overlapping regions as mutually overlapping areas.

[0147] In one aspect of the projection apparatus of the present invention, in the sub-image, the brightness gradually decreases from the boundary between the overlapping region and other regions toward the edge of the overlapping region.

[0148] One aspect of the projection device of the present invention includes an fθ lens that causes the image light reflected by the scanning mirror to image on the scanned surface.

[0149] The control method of the projection device according to one aspect of the present invention may also have the following structure.

[0150] In one aspect of the control method for a projection device according to the present invention, the projection device comprises: a light-emitting display panel having a plurality of pixels having light-emitting elements arranged in a matrix; a scanning mirror; and a projection optical system that guides image light from the light-emitting display panel to the scanning mirror, wherein the scanning mirror reflects the image light emitted from the light-emitting display panel toward a surface to be scanned, and scans the reflected image light in two dimensions on the surface to be scanned.

[0151] One aspect of the present invention provides a method for controlling a projection device, comprising the steps of: controlling the rotational movement of a scanning mirror such that a scanning point on the scanning surface moves along a predetermined scanning path; and controlling the light-emitting display panel such that image light is emitted when the scanning point reaches each of a plurality of image display points set on the scanning path.

Claims

1. A projection device, comprising: A light-emitting display panel that arranges multiple pixels with light-emitting elements in a matrix; A scanning mirror reflects the image light emitted from the light-emitting display panel toward the surface to be scanned, and scans the reflected image light in two dimensions on the surface to be scanned. as well as A projection optical system that guides the image light from the light-emitting display panel to the scanning mirror. The projection device has a control unit that controls the light-emitting display panel and the scanning mirror. The control unit controls the rotation of the scanning mirror in such a way that the scanning point on the scanned surface moves along a predetermined scanning path, and controls the light-emitting display panel in such a way that the image light is emitted when the scanning point reaches each of a plurality of image display points set on the scanning path. The control unit divides the input image into multiple sub-images, thereby controlling the light-emitting display panel to emit image light representing the sub-image corresponding to the arrived image display point when the scanning point reaches each of the multiple image display points set on the scanning path. Adjacent pairs of sub-images in a plurality of sub-images have overlapping regions that are mutually overlapping areas. In the sub-image, the brightness gradually decreases from the boundary between the overlapping region and other regions toward the edge of the overlapping region.

2. The projection device according to claim 1, wherein, The control unit controls the rotation of the scanning mirror such that the scanning point moves at a constant speed within a range of two adjacent image display points and stops at the image display point for a predetermined time, and controls the light-emitting display panel such that the image light is emitted from the scanning point during the predetermined time when the scanning point stops at the image display point.

3. The projection device according to claim 1, wherein, The control unit controls the rotation of the scanning mirror in such a way that the scanning point moves at a constant speed on the scanning path, and controls the light-emitting display panel to emit image light when the scanning point reaches each of the plurality of image display points set on the scanning path.

4. The projection device according to any one of claims 1 to 3, wherein, The projection device includes an fθ lens that images the image light reflected by the scanning mirror onto the surface being scanned.

5. A control method for a projection device, the projection device comprising: a light-emitting display panel having a plurality of pixels having light-emitting elements arranged in a matrix; a scanning mirror; and a projection optical system for guiding image light from the light-emitting display panel to the scanning mirror, wherein... The scanning mirror reflects the image light emitted from the light-emitting display panel toward the surface to be scanned, and scans the reflected image light in two dimensions on the surface to be scanned. The control method includes the following steps: The rotational movement of the scanning mirror is controlled in such a way that the scanning point on the scanning surface moves along a predetermined scanning path; as well as The light-emitting display panel is controlled such that the image light is emitted when the scanning point reaches each of the plurality of image display points set on the scanning path. In the process of controlling the light-emitting display panel, the input image is divided into multiple sub-images, such that when the scanning point reaches each of the multiple image display points set on the scanning path, the light-emitting display panel is controlled in such a way that image light representing the sub-image corresponding to the reached image display point is emitted. Adjacent pairs of sub-images in a plurality of sub-images have overlapping regions that are mutually overlapping areas. In the sub-image, the brightness gradually decreases from the boundary between the overlapping region and other regions toward the edge of the overlapping region.

Images