Projection method, projector, and program product

Abstract

The invention provides a projection method, a projector, and a program product, which can improve operability under the condition that the position of a projection image is changed. A projection method includes: projecting a drawing image or a projection image onto a projection surface by a main body including a light modulation device that draws the drawing image and the projection image obtained by reducing the drawing image and modulates light from a light source; receiving a first operation for moving the projection image with respect to the projection surface or a second operation for enlarging the projection image; and moving the projection image along the outer edge in accordance with the first operation or the second operation when the projection image is brought into contact with the outer edge of the rendering image by the first operation or the second operation and the first operation or the second operation continues.

Description

Technical Field

[0001] The invention relates to a projection method, a projector and a program product. Background Art

[0002] The following projection display device is known: a light modulator modulates light emitted from a light source according to an image signal to form an optical image, and the optical image is magnified and projected onto a projection surface by an optical system such as a lens. In such a projection display device, when there are great restrictions on the installation location and installation time, it is not necessarily installed in front of the projection surface, but most of the time the projection display device must be installed in a state where the optical axis is inclined relative to the projection surface.

[0003] Therefore, there is known a technique for adjusting the position and shape of a projection image, which is an optical image corresponding to image data, in a region modulatable by a light modulator according to a user operation (for example, see Patent Document 1).

[0004] Patent Document 1: Japanese Patent Application Publication No. 2006-246306

[0005] However, in the above technology, for example, when the position of the projected image is changed, the movement of the projected image stops regardless of the user's operation when the outer frame of the projected image reaches the outer edge of the area modulated by the light modulator. Such a stop is an action opposite to the user's operation, so there is a problem of poor operability for the user. Summary of the invention

[0006] In order to solve the above-mentioned problems, a projection method of one embodiment of the present invention includes: a main body of a light modulation device that depicts a depicted image and a projection image obtained by reducing the depicted image and modulates light from a light source, projects the depicted image or the projection image onto a projection surface; accepts a first operation for moving the projection image relative to the projection surface or a second operation for enlarging the projection image; and when the projection image contacts an outer edge of the depicted image through the first operation or the second operation and the first operation or the second operation continues, moves the projection image along the outer edge according to the first operation or the second operation.

[0007] In order to solve the above-mentioned problems, a projector of another embodiment of the present invention includes: a light modulator, which depicts a depicted image and a projection image obtained by reducing the depicted image; a projection lens, which is used to project the depicted image or the projection image onto a projection surface; an operating member, which indicates a first operation for moving the projection image relative to the projection surface or a second operation for enlarging the projection image; and a control device, which moves the projection image along the outer edge of the depicted image according to the first operation or the second operation specified by the operating member when the projection image contacts the outer edge of the depicted image due to the first operation or the second operation specified by the operating member and the first operation or the second operation continues.

[0008] In order to solve the above-mentioned problems, a program product in another embodiment of the present invention enables a computer that controls a light modulator to execute processing, wherein the light modulator depicts a depicted image and a projection image obtained by reducing the depicted image, and modulates light from a light source, and the processing is: projecting the depicted image or the projection image onto a projection surface; accepting a first operation for moving the projection image relative to the projection surface or a second operation for enlarging the projection image; and when the projection image contacts an outer edge of the depicted image through the first operation or the second operation and the first operation or the second operation continues, moving the projection image along the outer edge according to the first operation or the second operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a diagram showing a projection type display device to which the projection method according to the embodiment is applied.

[0010] Figure 2 It is a diagram showing the optical structure of a projection type display device.

[0011] Figure 3 This is a block diagram showing the electrical structure of a projection display device.

[0012] Figure 4 It is a block diagram constructed by a control device in a projection type display device.

[0013] Figure 5 This is a diagram showing an example of a drawn image projected onto a projection surface by a projection display device.

[0014] Figure 6 This is a diagram showing an example of correction of a projected image in a rendered image.

[0015] Figure 7 This is a diagram showing an example of correction of a projected image in a rendered image.

[0016] Figure 8A diagram showing a projected image on a liquid crystal panel.

[0017] Fig. 9 A diagram showing a reduced projection image in a rendered image.

[0018] Fig.10 It is a diagram showing a reduction of a projected image on a liquid crystal panel.

[0019] Fig.11 A diagram showing the movement of a projected image in a rendered image.

[0020] Fig.12 It is a diagram showing the movement of a projected image on a liquid crystal panel.

[0021] Fig.13 A diagram showing the movement of a projected image in a rendered image.

[0022] Fig.14 It is a diagram showing the movement of a projected image on a liquid crystal panel.

[0023] Fig.15 This is a flowchart showing the operation of moving, reducing, and enlarging a projected image.

[0024] Fig.16 This is a flowchart showing the operation of moving, reducing, and enlarging a projected image.

[0025] Fig.17 This is a diagram showing conditions for prohibiting enlargement of a projection image of a rendered image.

[0026] Fig.18 This is a diagram showing conditions for prohibiting enlargement of a projection image of a rendered image.

[0027] Fig.19 This is a diagram showing conditions for prohibiting enlargement of a projection image of a rendered image.

[0028] Fig. 20 This is a diagram showing conditions for prohibiting enlargement of a projection image of a rendered image.

[0029] Fig.21 This is a diagram showing conditions for prohibiting enlargement of a projection image of a rendered image.

[0030] Fig. 22 This is a diagram showing conditions for prohibiting enlargement of a projection image of a rendered image.

[0031] Fig.23 This is a diagram showing conditions for prohibiting enlargement of a projection image of a rendered image.

[0032] Fig.24 This is a diagram showing conditions for prohibiting enlargement of a projection image of a rendered image.

[0033] Fig.25 It is a diagram showing an example of a drawn image and a projected image projected onto a projection surface.

[0034] Fig.26 This is a diagram showing an example of a projected image on a liquid crystal panel.

[0035] Fig. 27 A diagram showing the movement of a projected image in a rendered image.

[0036] Fig.28 It is a diagram showing the movement of a projected image on a liquid crystal panel.

[0037] Fig.29 FIG. 1 is a diagram showing an example of a change in the moving speed of a projected image on a liquid crystal panel.

[0038] Fig.30 It is a diagram showing the contact of the projected image in the depicted image.

[0039] Fig.31 It is a diagram showing the contact of the projected image in the liquid crystal panel.

[0040] Fig.32 A diagram showing the movement of a projected image in a rendered image.

[0041] Fig.33 It is a diagram showing the movement of a projected image on a liquid crystal panel.

[0042] Fig.34 This is a diagram showing that the movement of the projected image in the rendered image is prohibited.

[0043] Fig.35 This is a diagram showing the prohibition of movement of the projected image in the liquid crystal panel.

[0044] Fig.36 It is a diagram showing an enlarged view of a projected image in a rendered image.

[0045] Fig.37 It is a diagram showing an enlarged view of a projected image in a rendered image.

[0046] Fig.38 This is a diagram showing that enlargement of a projected image in a rendered image is prohibited.

[0047] Fig.39 This is a diagram showing a state where the projected image cannot be moved.

[0048] Fig.40 This is a diagram showing a state where the projected image can be moved.

[0049] Description of symbols

[0050] 1: projection display device; 3: host device; 5: computer; 50: control device; 52: operation device; 501: processing control unit; 502: operation receiving unit; 503: image processing unit; 504: determination unit; 100R, 100G, 100B: liquid crystal panels. DETAILED DESCRIPTION

[0051] Hereinafter, the projection method of the projection display device of the embodiment will be described with reference to the accompanying drawings. In addition, in each figure, the size and scale of each part are appropriately different from the actual size and scale. In addition, the embodiment described below is a preferred specific example, and therefore various preferred limitations are added technically, but the scope of the present disclosure is not limited to these modes as long as there is no record of the main purpose of the present disclosure in the following description.

[0052] Figure 1 1 is a diagram showing an overview of a projection display device 1 to which a projection method is applied. As shown in the figure, the projection display device 1 is a so-called projector, and projects an image represented by image data provided from a host device 3 onto a projection surface S such as a screen or a wall. The projection display device 1 is not necessarily arranged in front of the projection surface S due to restrictions such as the installation location and the installation time. The image projected in a state where the optical axis of the projection display device 1 is tilted relative to the projection surface S is distorted as shown in the figure. Therefore, as described later, the image represented by the image data is adjusted to be projected in a rectangular shape during projection, and the image adjusted to be a rectangle is moved, enlarged, or reduced.

[0053] Figure 2 1 is a diagram showing the optical structure of the projection display device 1. As shown in the figure, the projection display device 1 includes liquid crystal panels 100R, 100G and 100B as an example of a light modulation device. In addition, a lamp unit 2102 composed of a white light source such as a halogen lamp is provided inside the projection display device 1. The projection light emitted from the lamp unit 2102 is separated into three primary colors of red (R), green (G) and blue (B) by three reflectors 2106 and two dichroic mirrors 2108 arranged inside. Among them, R light is incident on the liquid crystal panel 100R, G light is incident on the liquid crystal panel 100G, and B light is incident on the liquid crystal panel 100B.

[0054] In addition, since the optical path of B is longer than the optical paths of R and G, it is necessary to prevent loss in the optical path of B. Therefore, a relay lens system 2121 composed of an incident lens 2122, a relay lens 2123, and an emission lens 2124 is provided on the optical path of B.

[0055] As is well known, the liquid crystal panel 100R has a plurality of pixel circuits. The plurality of pixel circuits respectively include liquid crystal elements. That is, the liquid crystal panel 100R includes a plurality of liquid crystal elements arranged in a matrix along a first direction and a second direction orthogonal to the first direction. When observed from a third direction orthogonal to the first direction and the second direction, the shape of the outer shape of the liquid crystal panel 100R is a rectangle having four mutually orthogonal sides. The transmittance of the liquid crystal element of the liquid crystal panel 100R is driven based on a data signal corresponding to R, thereby changing according to the voltage of the data signal. Therefore, in the liquid crystal panel 100R, a transmission image of R is generated by controlling the transmittance of the liquid crystal element alone. Similarly, in the liquid crystal panel 100G, a transmission image of G is generated based on a data signal corresponding to G, and in the liquid crystal panel 100B, a transmission image of B is generated based on a data signal corresponding to B.

[0056] As is known to all, the liquid crystal panel 100R has a plurality of pixel circuits. The plurality of pixel circuits respectively include liquid crystal elements. The liquid crystal element of the liquid crystal panel 100R is driven based on a data signal corresponding to R, thereby becoming a transmittance corresponding to the voltage of the data signal. Therefore, in the liquid crystal panel 100R, a transmission image of R is generated by controlling the transmittance of the liquid crystal element alone. Similarly, in the liquid crystal panel 100G, a transmission image of G is generated based on a data signal corresponding to G, and in the liquid crystal panel 100B, a transmission image of B is generated based on a data signal corresponding to B.

[0057] The transmission images of each color generated by the liquid crystal panels 100R, 100G and 100B are incident on the dichroic prism 2112 from three directions. In the dichroic prism 2112, the light of R and B is refracted by 90 degrees, while the light of G goes straight. Therefore, the dichroic prism 2112 synthesizes the images of each color. That is, the color image is synthesized by the additive mixing of the liquid crystal panels 100R, 100G and 100B. In addition, the synthesized color image is a rectangle when viewed from above. The view from above refers to the situation observed from a location along the emission axis Z of the dichroic prism 2112.

[0058] The color image synthesized by the dichroic prism 2112 is incident on the projection lens 2114. The projection lens 2114 enlarges the color image synthesized by the dichroic prism 2112 and projects it onto the projection surface S.

[0059] The transmitted images of the liquid crystal panels 100R and 100B are projected after being reflected by the dichroic prism 2112, whereas the transmitted image of the liquid crystal panel 100G is projected straight. Therefore, the transmitted images of the liquid crystal panels 100R and 100B are inverted left and right with respect to the transmitted image of the liquid crystal panel 100G.

[0060] In addition, the liquid crystal panel 100R has a maximum range in which a transmission image of R can be generated based on a data signal corresponding to R. That is, the liquid crystal panel 100R has a maximum depiction range. The maximum depiction range is an area in which a plurality of liquid crystal elements are arranged as a whole in the liquid crystal panel 100R. When viewed from the third direction, the maximum depiction range has a rectangular shape. If a depicted image exceeding the maximum depiction range is depicted on the liquid crystal panel 100R, the transmission image of R is missing, so the liquid crystal panel 100R is configured to depict the depicted image within the maximum depiction range. The same applies to the liquid crystal panels 100G and 100B.

[0061] The liquid crystal panels 100R, 100G, and 100B differ only in the color, i.e., the wavelength, of the incident light, and have substantially the same structure. Therefore, when it is not necessary to specify the color for description, the liquid crystal panels 100R, 100G, and 100B are described with reference numerals set to 100. In addition, the color image synthesized by the color separation prism 2112, i.e., the color image before being projected onto the projection surface S by the projection lens 2114, is hereinafter labeled as an image generated by the liquid crystal panel 100 for convenience, to distinguish it from the image projected onto the projection surface S.

[0062] Figure 3 1 is a block diagram showing an electrical configuration of the projection display device 1. The projection display device 1 includes a computer 5 in addition to the above-mentioned liquid crystal panels 100R, 100G, and 100B. The computer 5 executes the projection method of the embodiment in cooperation with software.

[0063] The computer 5 includes various devices, specifically, a control device 50, a storage device 51, an operation device 52, an input IF (interface) 53, and an output IF 54. These devices are electrically connected to each other via, for example, a bus Bs.

[0064] The projection display device 1 is an example of a “projector” and a “main body”.

[0065] The control device 50 is composed of a single or multiple processing circuits such as a CPU (Central Processing Unit) and centrally controls each element of the computer 5. In addition, the control device 50 may be composed of a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit) or other circuits in addition to the CPU.

[0066] The storage device 51 is a single or multiple memories composed of a known recording medium such as a magnetic recording medium or a semiconductor recording medium, and stores programs executed by the control device 50, various data used by the control device 50, etc. In addition, the storage device 51 is used as a frame memory for temporarily storing image data input from the host device 3 and a counter for counting the elapsed time.

[0067] The storage device 51 may be composed of a combination of a plurality of recording media. Alternatively, the storage device 51 may be a portable recording medium that is detachable from the computer 5 or an external recording medium that the computer 5 can communicate with via a communication network, such as an online storage device.

[0068] The operating device 52 has a plurality of operating elements operated by the user, and outputs information corresponding to the operation of these operating elements to the control device 50. In the present embodiment, the operating device 52 includes operating elements 521 to 526 operated by the user. The operating elements 521 to 524 are arrow keys, and by operation, the movement or selection of the object element is indicated in the direction of the arrow. In detail, the operating elements 521 to 524 indicate the movement or selection of the object element in the upward direction, the downward direction, the left direction, and the right direction in sequence by operation. In addition, as the object element, there are four vertices of a quadrilateral, the moving direction of the projected image, etc. as described later.

[0069] In addition, the operating element 525 is a key for specifying the enlargement of the projected image by operation. The operating element 526 is a key for specifying the reduction of the projected image by operation. In addition, the operating elements 525 and 526 are also used to increase or decrease the length of the period St described later from the initial setting value (for example, 1 second). In addition, the operating elements 521 to 526 can be physical keys or virtual keys displayed on a screen. The period St is an example of the "first period".

[0070] The input IF 53 inputs image data from the host device 3 .

[0071] The output IF 54 converts the image data corresponding to R among the image data processed by the control device 50 into an analog data signal through a DA conversion circuit (not shown), and supplies the analog data signal to the liquid crystal panel 100R. Similarly, the output IF 54 converts the image data corresponding to G among the image data processed by the control device 50 into an analog data signal and supplies the analog data signal to the liquid crystal panel 100G, and converts the image data corresponding to B into an analog data signal and supplies the analog data signal to the liquid crystal panel 100B.

[0072] Figure 4is a block diagram illustrating a functional structure of the control device 50. The control device 50 functions as a plurality of elements for processing an image projected onto the projection surface S by executing a program stored in the storage device 51. The plurality of elements are, for example, a processing control unit 501, an operation receiving unit 502, an image processing unit 503, and a determination unit 504.

[0073] The processing control unit 501 controls the operation accepting unit 502, the image processing unit 503, and the determination unit 504. Specifically, the processing control unit 501 instructs the image processing unit 503 to perform image processing, or instructs the determination unit 504 to perform determination, based on the information accepted by the operation accepting unit 502. In addition, the processing control unit 501 instructs the image processing unit 503 to perform image processing based on the determination result of the determination unit 504.

[0074] When the operating elements 521 to 526 in the operating device 52 are operated by the user, the operation accepting unit 502 outputs operation information indicating the operation state to the processing control unit 501 .

[0075] The image processing unit 503 generates a projection image on the liquid crystal panel 100 and performs processing of deforming, enlarging, reducing, and moving the generated projection image under the control of the processing control unit 501 .

[0076] The determination unit 504 determines the vertex coordinates and the like of the projected image on the liquid crystal panel 100 according to the instruction of the processing control unit 501 , and outputs the determination result to the processing control unit 501 .

[0077] As described above, when the projection display device 1 is set in a state tilted relative to the projection surface S, the projected image is distorted. The image data provided from the host device 3 usually specifies a rectangular image, so it is necessary to adjust or correct so that the projected image becomes a rectangle. As an example of such correction or adjustment, optical correction based on tilting the optical axis of the projection lens 2114 can be cited, but in this embodiment, it is set as digital correction. In addition, digital correction refers to deforming the image depicted on the liquid crystal panel 100 so that it becomes, for example, a rectangle when projecting the image represented by the image data provided from the host device 3.

[0078] Figure 51 is a diagram showing an example of a distorted image projected when the projection display device 1 is set in a tilted state relative to the projection surface S. The distorted quadrilateral image projected without correction immediately after the setting is assumed to be a depicted image Qu. For convenience, the four vertices in the depicted image Qu are designated A, B, C, and D in a counterclockwise order from the lower left. The depicted image Qu on the projection surface S corresponds to the image depicted within the maximum depiction range of the liquid crystal panel 100. The image depicted within the maximum depiction range of the liquid crystal panel 100 is projected onto the projection surface S as the depicted image Qu via the projection lens 2114.

[0079] In addition, the frame formed by connecting the vertices A, B, C and D with straight lines is the outer edge of the image Qu. In other words, the outer edge of the image Qu represents the outer edge of the liquid crystal panel 100 in the projection surface S, that is, the outline of the maximum range of the image that can be drawn on the liquid crystal panel 100. The shape of the outer edge of the liquid crystal panel 100 is a rectangle that includes as sides a line passing through a first element column composed of a plurality of liquid crystal elements arranged at the outermost side in the first direction and arranged in the second direction and a line passing through a second element column composed of a plurality of liquid crystal elements arranged at the outermost side in the second direction and arranged in the first direction. Therefore, when viewed from the third direction, the shape of the outer edge of the image Qu is a rectangle. When the projection display device 1 is set in a state inclined relative to the projection surface S, the rectangular liquid crystal panel 100 fixed inside the projection display device 1 is also inclined relative to the projection surface S, so the overall distortion of the image Qu drawn on the projection surface S. In addition, a distorted quadrilateral refers to a shape in which none of the four vertices is a right angle and none of the two opposing sides is parallel.

[0080] In order to project the image represented by the image data in the rendered image Qu onto the projection surface S in a rectangular shape, the user operates the operating device 52 to generate a desired rectangle within the range of the rendered image Qu as follows, for example.

[0081] First, the user specifies one of the four vertices that describe the image Qu.

[0082] Specifically, the user selects vertex A by operating the operating elements 521 to 524, and then moves the vertex A to the position of vertex Aa of the desired rectangle as shown by the arrow. In addition, when the vertex A of the depicted image Qu on the projection surface S is designated and moved, vertex Aa is separated from vertex A, as shown in FIG. Figure 6 As shown, the image Qu_a of the quadrilateral having vertices Aa, B, C and D is displayed in different colors from the image depicting the image Qu.

[0083] Similarly, the user performs an operation to move the vertex B to the position of the vertex Ba, an operation to move the vertex C to the position of the vertex Ca, and an operation to move the vertex D to the position of the vertex Da.

[0084] In addition, if the aspect ratio of the image represented by the image data provided from the host device 3 is predetermined, then at the stage where the positions of two points among the vertices Aa, Ba, Ca and Da are specified, the other two points are moved to positions determined by the aspect ratio.

[0085] By doing this, Figure 7 As shown, an image Qu_a adjusted to a rectangle is displayed within the range of the depicted image Qu. In addition, the image Qu_a is called a projection image to distinguish it from the depicted image. In addition, for convenience, let Fa be a frame formed by connecting the vertices Aa, Ba, Ca and Da in the projection image Qu_a. The projection image Qu_a is an image obtained by reducing the depicted image Qu in order to project the image represented by the image data onto the projection surface S in a rectangular shape. The projection image Qu_a is a deformed image obtained by deforming the depicted image Qu in order to project the image represented by the image data onto the projection surface S in a rectangular shape. The projection image Qu_a is projected from the projection type display device 1 onto the projection surface S via the projection lens 2114. That is, the projection type display device 1 projects the depicted image Qu or the projection image Qu_a onto the projection surface S.

[0086] The image represented by the image data provided by the host device 3 is displayed after being deformed by the image processing unit 503 so as to fall within the projection image Qu_a. Figure 7 In order not to hinder the display of the image represented by the image data, the area with a shadow in the image processing unit 503 is displayed as a black image, that is, a black image with a brightness of approximately zero on the projection surface S. Figure 7 The areas with shadows added are observed as not projecting any image from the user's perspective.

[0087] Figure 7 The depicted image Qu and the projected image Qu_a shown are the result of projecting the image generated by the liquid crystal panel 100 onto the projection surface S. In other words, the projected image Qu_a in the liquid crystal panel 100 is as shown in the liquid crystal panel 100. Figure 8 It is distortedly generated as shown so that the projection image Qu_a actually projected onto the projection surface S becomes a rectangle.

[0088] When the user corrects the drawing position of the projection image Qu_a in the drawing image Qu, it is considered that the user often temporarily reduces the projection image Qu_a. This is because reducing the projection image Qu_a increases the freedom of movement within the range of the drawing image Qu.

[0089] When the user operates the operation element 526 for designating reduction in the operation device 52, the image processing unit 503 reduces the projection image Qu_a based on the center Cen of the frame Fa according to the period during which the operation element 526 is operated. The projection image Qu_a after reduction is similar to the projection image Qu_a before reduction. In addition, the center Cen refers to the diagonal center or the center of gravity of the frame Fa. In addition, "based on the center Cen" means that the position of the center Cen before reduction does not change after reduction.

[0090] Fig. 9 The projection image Qu_a in the depicted image Qu of the projection surface S is relative to Figure 7 The projected image in the example is reduced by a similarity ratio of 50%, in other words, by an area ratio of 25%. Fig.10 It means that in Fig. 9 When the drawn image Qu and the projection image Qu_a are projected onto the projection surface S as shown, an example of the projection image Qu_a in the liquid crystal panel 100 is an example in which the projection image shown by the dotted line is reduced with a similarity ratio of 50% based on the center Cen.

[0091] In addition, here, the reduction of the projected image Qu_a is described, but the same applies to the enlargement. In detail, when the user operates the operating member 525 for designating enlargement in the operating device 52, the image processing unit 503 enlarges the projected image Qu_a in a similar shape based on the center Cen of the frame Fa according to the period during which the operating member 525 is operated.

[0092] However, since the projection image Qu_a is generated within the range of the liquid crystal panel 100, the projection image Qu_a cannot exceed the depicted image Qu when observed on the projection surface S. Therefore, when the frame Fa of the projected image Qu_a on the projection surface S contacts the outer edge of the depicted image Qu by enlargement, the projection image Qu_a is enlarged while moving along the outer edge of the depicted image Qu, that is, the outer edge of the liquid crystal panel 100, as described later.

[0093] The case where the frame Fa of the projected image Qu_a contacts the outer edge of the drawn image Qu by enlargement means, in other words, the case where the frame Fa of the projected image Qu_a contacts the outer edge of the display area in the liquid crystal panel 100 .

[0094] Next, how the image generated by the liquid crystal panel 100 changes when the projection image Qu_a is moved within the drawn image Qu on the projection plane S will be described.

[0095] First, the case where the projected image Qu_a moves to the left or right is described. Fig.11As shown, a rectangular projection image Qu_a is projected onto the projection surface S through digital correction. Fig.11 The projected image Qu_a in Fig. 9 The projected image Qu_a in is the same.

[0096] In this state, the user operates the operating element 523, for example, when the user wishes to move the projection image Qu_a adjusted to a rectangular shape in parallel to the left direction, for example Fig.11 The situation of the position of the quadrilateral Ha shown by the dotted line.

[0097] In the parallel movement in this case, the upper side of the projected image Qu_a moves along the extension line of the straight line from the vertex Ca toward the vertex Da, and the lower side of the projected image Qu_a moves along the extension line of the straight line from the vertex Ba toward the vertex Aa.

[0098] Therefore, the movement amount and movement direction of the projected image Qu_a in this case are Fig.11 can be represented by a vector Jh starting from the center Cen. Fig.11 , the direction of vector Jh is the same as the left direction specified by operating member 523.

[0099] Fig.12 is used to explain the liquid crystal panel 100 as Fig.10 The diagram shows what shape and how the projected image Qu_a generated as shown.

[0100] In the liquid crystal panel 100, the projected image Qu_a moves to the Fig.12 Specifically, the moved quadrilateral Ha is obtained by moving the upper side of the projected image Qu_a before the movement along the extension line of the straight line from the vertex Ca toward the vertex Da, and moving the lower side of the projected image Qu_a along the extension line of the straight line from the vertex Ba toward the vertex Aa.

[0101] In addition, Fig.12 In the case of , the projected image after moving to the left is a graphic obtained by enlarging the projected image Qu_a before the movement in a roughly similar shape.

[0102] In the liquid crystal panel 100, the movement amount and movement direction of the projected image Qu_a are as follows: Fig.12 If the movement operation is in the left direction, the direction of the vector Jh can be represented by the composite vector of the vector from the vertex Ba toward the vertex Aa and the vector from the vertex Ca toward the vertex Da. The vector Jh represented by the composite vector can be decomposed into the horizontal component and the vertical component in the liquid crystal panel 100. Fig.12 The vector Jh shown is an example in which the horizontal component in the left direction is greater than the vertical component in the upward direction.

[0103] Here, the movement in the left direction is described, but the movement in the right direction is the same. Although not particularly illustrated, in the liquid crystal panel 100, the upper side of the projected image Qu_a moves along the extension of the straight line from the vertex Da to the vertex Ca, and the lower side of the projected image Qu_a moves along the extension of the straight line from the vertex Aa to the vertex Ba. In the liquid crystal panel 100, the direction of movement in the right direction is represented by the composite vector of the vector from the vertex Da to the vertex Ca and the vector from the vertex Aa to the vertex Ba. The direction of the composite vector is the opposite direction to the vector Jh.

[0104] In addition, the projected image after moving to the right becomes Fig.12 The projection image Qu_a before the movement shown by the solid line is a reduced image in a substantially similar shape.

[0105] Next, a case where the projection image Qu_a is moved upward or downward will be described.

[0106] Here, if Fig.13 As shown, a rectangular projection image Qu_a is projected on the projection surface S. In addition, Fig.13 The projected image Qu_a in Fig. 9 and Fig.11 The projected image Qu_a in is the same.

[0107] In this state, the user operates the operating member 521, for example, when the user wishes to move the projection image Qu_a adjusted to a rectangular shape parallel to the projection image Qu_a. Fig.13 The position of the quadrilateral Hb shown by the dotted line.

[0108] In the parallel movement in this case, the left side of the projected image Qu_a moves along the extension line of the straight line from the vertex Aa toward the vertex Da, and the right side of the projected image Qu_a moves along the extension line of the straight line from the vertex Ba toward the vertex Ca.

[0109] Therefore, the movement amount and movement direction of the projected image Qu_a in this case are Fig.14 can be represented by a vector Jv starting from the center Cen. Fig.13 The direction of the vector Jv in is the same as the upward direction specified by the operating member 521.

[0110] Fig.14 is used to explain the liquid crystal panel 100 as Fig.13 The diagram shows what shape and how the projected image Qu_a generated as shown.

[0111] In the liquid crystal panel 100, the projected image Qu_a moves to the Fig.14Specifically, the moved quadrilateral Hb is obtained by moving the left side of the projected image Qu_a before the movement along the extension line of the straight line from the vertex Aa toward the vertex Da, and the right side of the projected image Qu_a along the extension line of the straight line from the vertex Ba toward the vertex Ca.

[0112] In addition, Fig.14 In the case of , the projected image after the upward movement becomes a figure obtained by reducing the projected image Qu_a before the movement in a substantially similar shape.

[0113] In the liquid crystal panel 100, the movement amount and movement direction of the projected image Qu_a are as follows: Fig.14 If the movement operation is upward, the direction of the vector Jv is represented by the composite vector of the vector from vertex Aa toward vertex Da and the vector from vertex Ba toward vertex Ca. The vector Jv represented by the composite vector can be decomposed into a horizontal component and a vertical component in the liquid crystal panel 100. Fig.14 The vector Jv shown is an example in which the horizontal component in the right direction is smaller than the vertical component in the upward direction.

[0114] Here, the upward movement is described, but the downward movement is the same. Although not specifically illustrated, in the liquid crystal panel 100, the left side of the projected image Qu_a moves along the extension line of the straight line from the vertex Da to the vertex Aa, and the right side of the projected image Qu_a moves along the extension line of the straight line from the vertex Ca to the vertex Ba. In the liquid crystal panel 100, the downward movement direction is represented by the composite vector of the vector from the vertex Da to the vertex Aa and the vector from the vertex Ca to the vertex Ba. The direction of the composite vector is the opposite direction to the vector Jv.

[0115] In addition, the projected image after moving downward becomes Fig.14 The projection image Qu_a before the movement shown by the solid line is a roughly similar enlarged graph.

[0116] The reduction and enlargement of the projected image Qu_a are as already explained.

[0117] Next, the operation of the projection method of the embodiment, specifically, the operation in the case of moving, reducing or enlarging the projection image Qu_a will be described. In addition, it is assumed that the projection image Qu_a has been digitally corrected to be a rectangle on the projection plane S.

[0118] The period St can be changed from the initial setting value by the operation button 525 or 526, and it is assumed that it has been changed from the initial setting value by the user's operation. Therefore, the operation button 525 specifies enlargement of the projected image Qu_a, and the operation button 526 specifies reduction of the projected image Qu_a.

[0119] Fig.15 and Fig.16 is a flow chart showing the actions of the projection method.

[0120] The processing control unit 501 repeatedly executes the following steps S11 to S30 except step S20 at a fixed time interval (for example, every 16.7 milliseconds). For convenience, this time interval is expressed as a round time.

[0121] First, in step S11, the processing control unit 501 determines which of the operating elements 521 to 526 is operated based on the operation information output from the operation receiving unit 502. If none of the operating elements 521 to 526 is operated, the determination result of step S11 is "No", and the processing control unit 501 returns the process to step S11. In other words, as long as none of the operating elements 521 to 526 is operated, the process only loops through step S11 every patrol time.

[0122] Although not particularly shown, when the result of determination in step S11 is "No" and the process returns to step S11, the processing control unit 501 stops counting of the counter if the counter is counting.

[0123] If any one of the operating elements 521 to 526 is operated, the result of the determination in step S11 is "Yes", and the processing control unit 501 determines in the next step S12 whether the counter is counting.

[0124] If the counter is not counting, the result of determination in step S12 is "No", and the processing control unit 501 resets the counter in step S13 and then starts counting the counter.

[0125] Furthermore, after the determination result of step S11 changes to “Yes”, the counter continues counting as long as the determination result continues to be “Yes.” Therefore, the time T counted by the counter represents the period during which the operation of the same operating element continues.

[0126] If the result of determination in step S12 is "Yes", or if the counter starts counting in step S13, the processing control unit 501 shifts the procedure to the next step S14.

[0127] In step S14, the processing control unit 501 determines whether the operated operating element is any one of the operating elements 521 to 524. The operated operating element referred to here is the operating element that is the basis for the determination result of "yes" in step S11.

[0128] If the operated operating element is not any of the operating elements 521 to 524 for designating the movement of the projected image Qu_a, the operated operating element is the operating element 525 for designating the enlargement of the projected image Qu_a or the operating element 526 for designating the reduction. Therefore, the determination result of step S14 is "No", and the processing control unit 501 transfers the process to step S26 described later.

[0129] If the operated operating element is any one of the operating elements 521 to 524 for designating the movement of the projected image Qu_a, the determination result of step S14 is “yes”. If the determination result of step S14 is “yes”, the processing control unit 501 instructs the determination unit 504 to determine whether the frame Fa of the projected image Qu_a contacts the outer edge of the depicted image Qu in step S15.

[0130] In addition, the contact mentioned here does not refer to physical contact, but to the geometric contact between the frame and the outer edge of the image area.

[0131] The following three modes are conceivable for this contact: one vertex of the frame Fa of the projected image Qu_a contacts one side of the outer edge of the image Qu, one side of the frame Fa contacts one side of the outer edge of the image Qu, and one vertex of the frame Fa contacts one vertex of the outer edge of the image Qu.

[0132] The determination unit 504 notifies the processing control unit 501 of the result of the determination of whether or not there is contact.

[0133] If it is a notification of non-contact, that is, the frame Fa of the projected image Qu_a is not in contact with the outer edge of the depicted image Qu, the determination result of step S15 is "No". If the determination result of step S15 is "No", the processing control unit 501 determines in step S16 whether the time T counted by the counter is less than the threshold value Tth.

[0134] If the time T is less than the threshold value Tth, the determination result of step S16 is “yes”. When the determination result of step S16 is “yes”, in step S17, the processing control unit 501 instructs the image processing unit 503 to move the projected image Qu_a on the liquid crystal panel 100 by the first distance L1 in the direction corresponding to the operated operating element.

[0135] In addition, the movement of the projected image Qu_a in the specified direction on the projection surface S is a movement in any one of the upward, downward, left and right directions. In the liquid crystal panel 100, as described above, the direction of the vector Jv corresponds to the upward direction, the opposite direction of the vector Jv corresponds to the downward direction, the direction of the vector Jh corresponds to the left direction, and the opposite direction of the vector Jh corresponds to the right direction.

[0136] Moving the first distance on the liquid crystal panel 100 means that the projected image Qu_a on the liquid crystal panel 100 moves a distance equal to the product of the magnitude of the vector indicating the moving direction and the positive first coefficient.

[0137] After the process of step S17, the process control unit 501 returns the procedure to step S11.

[0138] Therefore, if the operation of any one of the operating members 521 to 524 continues and the duration T is less than the threshold value Tth, step S17 is repeated for each turn through loop processing. Therefore, on the projection surface S, the projected image Qu_a moves in the operated direction at a first speed corresponding to the product of the first distance L1 multiplied by the inverse of the turn time.

[0139] In addition, the loop processing mentioned here means that the process loops along the path of steps S11 → S12 → S14 → S15 → S16 → S17 → S11.

[0140] If the time T is greater than the threshold value Tth, the determination result of step S16 is “No”. When the determination result of step S16 is “No”, in step S18, the processing control unit 501 instructs the image processing unit 503 to move the projected image Qu_a on the liquid crystal panel 100 by the second distance L2 in the direction corresponding to the operated operating element.

[0141] Moving the projection image Qu_a by the second distance on the liquid crystal panel 100 means moving the projection image Qu_a by a distance equal to the product of the magnitude of the vector indicating the moving direction and the second coefficient on the liquid crystal panel 100. Here, the second coefficient is larger than the first coefficient.

[0142] That is, the first distance L1 and the second distance L2 have the following relationship.

[0143] L1 <L2

[0144] Furthermore, after the process of step S18, the process control unit 501 returns the procedure to step S11.

[0145] Therefore, if the operation of any one of the operating elements 521 to 524 continues and the duration T is greater than the threshold value Tth, step S18 is repeatedly performed for each turn time through loop processing. Therefore, on the projection surface S, the projected image Qu_a moves in the operated direction at a second speed corresponding to the product of the second distance L2 multiplied by the inverse of the turn time.

[0146] In other words, when the time T during which the same operating element is continuously operated is equal to or greater than the threshold value Tth, the distance per unit time of movement of the projection image Qu_a increases from L1 to L2, and thus the moving speed of the projection image Qu_a increases from the first speed to the second speed.

[0147] The loop processing mentioned here means that the process loops along the path of steps S11 → S12 → S14 → S15 → S16 → S18 → S11.

[0148] On the other hand, when the processing control unit 501 receives a notification of contact from the determination unit 504 in response to the instruction to the determination unit 504 in step S15, the determination result in step S15 becomes “Yes”. That is, the frame Fa of the projection image Qu_a is in contact with the outer edge of the drawn image Qu.

[0149] If the determination result of step S15 is “YES”, the processing control unit 501 determines in step S19 whether the contact is caused by movement at the second distance L2, that is, contact caused by movement at the second speed.

[0150] If the contact is not caused by movement at the second speed, the result of the determination in step S19 becomes "No", and the processing control unit 501 skips step S20 and shifts the process to step S21.

[0151] On the other hand, if the contact is caused by movement at the second speed, the determination result of step S19 is "yes", and the processing control unit 501 in step S20 causes the image processing unit 503 to stop the projected image Qu_a at the point where it contacts the outer frame of the depicted image Qu for the set period St. That is, in step S20, the processing is temporarily stopped for the period St.

[0152] If the period St has passed, or if the determination result of step S19 is "No", the processing control unit 501 instructs the determination unit 504 to determine whether the contact caused by the movement, which is the basis for the determination result of step S15 to become "Yes", is the second contact in step S21. The determination unit 504 notifies the processing control unit 501 of the determination result of whether it is the second contact.

[0153] Regarding the contact caused by movement being the second contact, three cases are assumed in this embodiment.

[0154] The first case is that one vertex of the frame Fa of the projected image Qu_a is in contact with one side of the outer edge of the depicted image Qu, and the other vertex of the frame Fa is in contact with the other side of the outer edge of the depicted image Qu. The second case is that one side of the frame Fa of the projected image Qu_a is in contact with one side of the outer edge of the depicted image Qu. The third case is that one vertex of the frame Fa of the projected image Qu_a is in contact with one vertex of the outer edge of the depicted image Qu.

[0155] If the notification does not mean the second contact, the determination result of step S21 becomes "No". If the determination result of step S21 is "No", the processing control unit 501 instructs the image processing unit 503 in step S22 to move the projected image Qu_a in a direction along the outer edge and reflecting the operation direction in a state where the projected image Qu_a is in contact with the outer edge of the depicted image Qu.

[0156] Here, the direction along the outer edge and reflecting the operation direction refers to the direction reflecting the moving direction specified by the operating element, of the two directions along the outer edge, when the projection image Qu_a contacts the outer edge of the depicted image Qu when viewed on the projection plane S. Specifically, it is the direction that can be represented by a composite vector of the moving direction vector specified by the operating element and the vector in the direction orthogonal to the moving direction, of the two directions along the outer edge.

[0157] For example, when the operating member 523 is operated, the projected image Qu_a is projected onto the projection surface S. Fig.11 The projection image Qu_a moves in the left direction indicated by the vector Jh. When the operating member 523 is continuously operated, the vertex Aa in the frame Fa of the projected image Qu_a contacts the edge connecting the vertices A and D in the outer edge of the depicted image Qu. There are two directions along the edge, namely, the direction from vertex A to vertex D and the direction from vertex D to vertex A. Of these two directions, the direction that can be represented by the composite vector of the left direction vector specified by the operating member 523 and the vector in the direction orthogonal to the vector is the direction from vertex A toward vertex D. Therefore, by operating the operating member 523, on the projection surface S, the vertex Aa in the frame Fa of the projected image Qu_a contacts the edge connecting the vertices A and D in the outer edge of the depicted image Qu, and then moves in the direction from vertex A toward vertex D.

[0158] When viewed from the liquid crystal panel 100, when the vertex Aa contacts the outer edge of the liquid crystal panel 100, the angle formed by the vertices D, Aa, and Da is smaller than the angle formed by the vertices A, Aa, and Ba. Therefore, the vertex Aa in contact with the outer edge of the liquid crystal panel 100 moves in the direction from the vertex A toward the vertex D, that is, in the upward direction, along the side connected by the vertices A and D having the smaller angle.

[0159] In addition, for example, when the operating member 521 is operated, the projected image Qu_a is projected on the projection surface S. Fig.13 The projection image Qu_a moves in the upward direction indicated by the vector Jv. When the operating member 521 is continuously operated, the vertex Da in the frame Fa of the projected image Qu_a contacts the edge connecting the vertices C and D in the outer edge of the depicted image Qu. There are two directions along the edge, namely, the direction from vertex C to vertex D and the direction from vertex D to vertex C. Of these two directions, the direction that can be represented by a composite vector of the upward vector specified by the operating member 521 and the vector in a direction orthogonal to the vector is the direction from vertex D to vertex C. Therefore, by operating the operating member 521, on the projection surface S, the vertex Da in the frame Fa of the projected image Qu_a contacts the edge connecting the vertices C and D in the outer edge of the depicted image Qu, and then moves in the direction from vertex D to vertex C.

[0160] When viewed from the liquid crystal panel 100, when the vertex Da contacts the outer edge of the liquid crystal panel 100, the angle formed by the vertices C, Da, and Ca is smaller than the angle formed by the vertices D, Da, and Aa. Therefore, the vertex Da contacting the outer edge of the liquid crystal panel 100 moves in the direction from the vertex D to the vertex C, that is, in the right direction, along the side connected by the vertices D and C, which have the smaller angle.

[0161] Furthermore, after the process of step S22, the process control unit 501 returns the procedure to step S11.

[0162] On the other hand, if the notification means the second contact, the determination result of step S21 is "yes". If the determination result of step S21 is "yes", the processing control unit 501 causes the determination unit 504 to determine the following in step S23. That is, in step S23, the processing control unit 501 determines whether the projection image Qu_a in the second contact state has released the second contact state due to the operating member operated at the current time point.

[0163] The release of the second contact state means that when the projection image Qu_a moves according to the operated operating element, none of the first, second and third conditions described above is met.

[0164] For example, when the projection image Qu_a is located at the upper left end of the depicted image Qu and is in the second contact state, the operating member 524 can be operated to instruct the projection image Qu_a to move rightward, and the operating member 522 can be operated to instruct the projection image Qu_a to move downward.

[0165] The second contact state can also be released by reducing the projection image Qu_a, but this reduction is instructed by operating the operating element 526 (the result of determination in step S14 as a prerequisite is "No"), and therefore is not subject to determination in step S23.

[0166] If the operation to release the second contact state is notified, the determination result of step S23 is “Yes.” If the determination result of step S23 is “Yes,” the processing control unit 501 instructs the image processing unit 503 to move or reduce the projection image Qu_a according to the operation in step S24 .

[0167] After the process of step S24, the process control unit 501 returns the procedure to step S11.

[0168] On the other hand, if the notification is not an operation to release the second contact state, the determination result of step S23 is “No”. When the determination result of step S23 is “No”, in step S25, the processing control unit 501 instructs the image processing unit 503 to prohibit the movement of the projected image Qu_a regardless of the operation of the operating member.

[0169] After the process of step S25, the process control unit 501 returns the procedure to step S11.

[0170] Furthermore, if the operating element operated until the second contact is continued to be operated when the processing returns to step S11, the projected image Qu_a stops at the second contact location in step S25. On the other hand, if another operating element is operated so that the projected image Qu_a releases the second contact when the processing returns to step S11, the processing corresponding to the operation of the other operating element is executed.

[0171] If the operating element operated in step S11 is the operating element 525 for designating enlargement of the projection image Qu_a or the operating element 526 for designating reduction of the projection image Qu_a, the determination result in step S14 is "NO".

[0172] If the determination result of step S14 is "No", the processing control unit 501 Fig.16 In step S26, it is determined whether the operated operating element is the operating element 525 for designating enlargement of the projected image Qu_a. The operated operating element referred to here is the operating element when the determination result in step S11 is "yes".

[0173] If the operated operating element is not the operating element 525, the operated operating element is the operating element 526 for designating reduction of the projection image Qu_a, and the determination result of step S26 is "NO".

[0174] If the result of the determination in step S26 is "No", the processing control unit 501 instructs the image processing unit 503 in step S27 to reduce the projection image Qu_a at the current time point to a predetermined ratio (for example, 98% relative to the original image) based on the center Cen and the similar shape. According to the instruction, the image processing unit 503 actually reduces the projection image Qu_a according to the instruction.

[0175] After the process of step S27, the process control unit 501 returns the procedure to step S11.

[0176] In addition, when the operation of the operating member 526 continues, step S25 is repeated every cycle time through the loop processing. Therefore, on the projection surface S, the projected image Qu_a continues to shrink with the center Cen as the reference. The loop processing mentioned here means that the process is looped according to the path of steps S11→S12→S14→S26→S27→S11.

[0177] However, when the operation of the operating member 526 continues and the projected image Qu_a continues to shrink, the projected image Qu_a becomes a tiny dot and the user cannot recognize the projected image Qu_a. Therefore, for example, a structure may be adopted that prohibits the area of ​​the projected image Qu_a from shrinking to below a specified ratio relative to the area of ​​the liquid crystal panel 100.

[0178] If the operated operating member is the operating member 525 for designating the enlargement of the projected image Qu_a, the determination result of step S26 is "yes". If the determination result of step S26 is "yes", the processing control unit 501 inquires of the determination unit 504 in step S28 whether the enlargement prohibition condition of the projected image Qu_a is satisfied at the current time point. The enlargement prohibition condition of the projected image Qu_a refers to a state in which the projected image Qu_a cannot be further enlarged in the depicted image Qu. As a typical case in which the enlargement prohibition condition is satisfied, the three vertices of the frame Fa of the projected image Qu_a are in contact with the outer edge of the depicted image Qu. Other cases of the enlargement prohibition condition of the projected image Qu_a will be described later.

[0179] If the result of the inquiry to the determination unit 504 is that the enlargement prohibition condition is not satisfied, the determination result of step S28 is "No".

[0180] If the determination result of step S28 is "No", the processing control unit 501 instructs the image processing unit 503 to enlarge the projection image Qu_a at the current time point to a predetermined magnification (for example, 102% relative to the original image) in a similar shape in step S29.

[0181] When the apex of the projected image Qu_a contacts the outer edge of the drawn image Qu due to this enlargement, the image processing unit 503 enlarges the projected image Qu_a while moving the apex of the projected image Qu_a along the outer edge of the drawn image Qu. Therefore, the enlargement based on the center Cen may not be achieved.

[0182] After the process of step S29, the process control unit 501 returns the procedure to step S11.

[0183] If the result of the inquiry to the determination unit 504 is that the enlargement prohibition condition is satisfied, the determination result of step S28 is "Yes".

[0184] When the determination result in step S28 is “Yes”, in step S30 , the processing control unit 501 instructs the image processing unit 503 to prohibit enlarging the projection image Qu_a.

[0185] After the process of step S30, the process control unit 501 returns the procedure to step S11.

[0186] If the operation member 525 is still operated when the process returns to step S11, the projection image Qu_a is not enlarged in step S30. On the other hand, if an operation that does not satisfy the enlargement prohibition condition is performed when the process returns to step S11, for example, if the operation member 526 is operated, the projection image Qu_a is reduced.

[0187] Here, an example of the enlargement prohibition condition of the projection image Qu_a will be described. Figures 17 to 24 1 is a diagram showing an example of a condition for prohibiting enlargement of the projection image Qu_a with respect to the drawn image Qu.

[0188] In addition, it is assumed here that the projection image Qu_a has been digitally corrected to be in a rectangular state on the projection plane S.

[0189] Fig.17 The first example shown is a case where the depicted image Qu is rectangular when viewed on the projection surface S and the aspect ratio of the depicted image Qu is consistent with the aspect ratio of the projection image Qu_a. In this case, the enlargement prohibition condition is that the four vertices of the projection image Qu_a are respectively consistent with the four vertices of the depicted image Qu. In this case, from the perspective of the liquid crystal panel 100, the enlargement prohibition condition is also that the four vertices of the rectangular projection image Qu_a are respectively consistent with the four vertices of the liquid crystal panel 100.

[0190] Fig.18The second example shown is a case where the depicted image Qu is rectangular when viewed on the projection surface S, but the aspect ratio of the depicted image Qu is inconsistent with the aspect ratio of the projected image Qu_a. In this case, the enlargement prohibition condition is that the two opposite sides of the projected image Qu_a are in contact with the two opposite sides of the depicted image Qu. In this case, from the perspective of the liquid crystal panel 100, the enlargement prohibition condition is that the two opposite sides of the rectangular projected image Qu_a are in contact with the two opposite sides of the liquid crystal panel 100.

[0191] Fig.19 The third example shown is a case where the image Qu depicted is a trapezoid when viewed on the projection surface S. In this case, the enlargement prohibition condition is that one side of the projected image Qu_a contacts one of the two parallel sides of the projected image Qu, and the two vertices of the projected image Qu_a contact the two non-parallel sides of the projected image Qu. In this case, the projected image Qu_a on the liquid crystal panel 100 is a trapezoid. Therefore, from the perspective of the liquid crystal panel 100, the enlargement prohibition condition is that one of the two parallel sides of the projected image Qu_a contacts one side of the liquid crystal panel 100, and the two vertices at the two ends of the other of the two parallel sides of the projected image Qu_a contact the two sides of the liquid crystal panel 100, respectively.

[0192] Fig. 20 The fourth example shown and Fig.21 The fifth example shown is a case where the depicted image Qu is a quadrilateral and one of the four vertices is a right angle when viewed on the projection surface S. However, in this case, although it is possible from a geometric point of view, it is almost impossible to project the depicted image Qu in this shape in view of the setting state of the projection display device 1.

[0193] Fig. 22 The sixth example shown is a case where the depicted image Qu is a distorted quadrilateral when viewed on the projection surface S, and one side of the depicted image Qu is parallel to one side of the projected image Qu_a. In this case, the enlargement prohibition condition viewed from the projection surface S is that one side of the parallel projected image Qu_a is in contact with one side of the depicted image Qu, and one vertex of the projected image Qu_a is in contact with any one of the four sides of the depicted image Qu. In this case, the enlargement prohibition condition viewed from the liquid crystal panel 100 is that, similar to the projection surface S, one side of the parallel projected image Qu_a is in contact with one side of the depicted image Qu, and one vertex of the projected image Qu_a is in contact with any one of the four sides of the liquid crystal panel 100.

[0194] Fig.23The seventh example shown is a case where the depicted image Qu is a parallelogram when viewed on the projection surface S. However, from a geometric point of view, it is possible for the depicted image Qu projected onto the projection surface S to be a parallelogram, but in the projection type display device 1, it is almost impossible for the depicted image Qu to be projected in a parallelogram.

[0195] Fig.24 The eighth example shown is a case where the depicted image Qu is a distorted quadrilateral when viewed on the projection plane S. In this case, the enlargement prohibition condition viewed from the projection plane S is the typical case described above, that is, the three vertices of the projected image Qu_a are in contact with any three sides of the depicted image Qu. In this case, the enlargement prohibition condition viewed from the liquid crystal panel 100 is that the three vertices of the projected image Qu_a are in contact with the three sides of the outer edge of the liquid crystal panel 100.

[0196] As described above, the five cases that satisfy the amplification prohibition condition in the present embodiment are the first, second, third, sixth, and eighth examples.

[0197] Next, referring to the above flowchart, how the display of the projected image Qu_a changes when the user actually operates the operating elements 521 to 526 will be described in detail. In addition, it is assumed that the projected image Qu_a has been digitally corrected on the projection surface S. That is, Fig.25 As shown, on the projection plane S, in the distorted quadrilateral drawn image Qu, the projection image Qu_a is digitally corrected to a rectangle.

[0198] like Fig.25 As shown in FIG. 1 , when the depicted image Qu and the projected image Qu_a are projected onto the projection surface S, a region having a shape of Fig.26 Projected image Qu_a of the shape shown.

[0199] In this state, the user operates the operating element 523 to designate the projection image Qu_a to move to the left, for example. With this operation, the processing proceeds to steps S11, S12, and S13, and the time T from the start of the operation of the operating element 523 is counted.

[0200] When the operation of the operating member 523 continues, the frame Fa of the projected image Qu_a does not contact the outer edge of the depicted image Qu and the time T is less than the threshold value Tth, and the processing is performed in the order of steps S14, S15, S16 and S17, so that the projected image Qu_a moves to the left by the first distance L1 on the projection surface S. As long as this state continues, the processing repeatedly executes steps S11, S14, S15, S16 and S17 at each circuit time, so that on the projection surface S, the projected image Qu_a moves to the left at the first speed based on the first distance L1.

[0201] In addition, the first speed is represented by the product of the first distance L1 and the inverse of one round time.

[0202] Fig. 27 2 is a diagram showing a state in which the projection image Qu_a moves from the dotted line state to the left to the solid line state on the projection surface S when step S17 is repeated multiple times. Fig. 27 As shown in FIG. 1 , when the projected image Qu_a moves to the left relative to the depicted image Qu on the projection surface S, in the liquid crystal panel 100, as shown in FIG. Fig.28 As shown, the projected image Qu_a moves in the direction of the vector Jh while being deformed into a shape substantially similar to the shape indicated by the dotted line before the movement.

[0203] While the operation of the operating member 523 continues, when the frame Fa of the projected image Qu_a does not contact the outer edge of the depicted image Qu and the time T is greater than the threshold Tth, the processing process enters steps S14, S15, S16, and S18, so that the moving distance of the projected image Qu_a in the left direction on the projection surface S changes from the first distance L1 to the second distance L2.

[0204] Since L1<L2, if the operation of the operating member 523 continues, Fig.29 As shown, the projection image Qu_a moves in the left direction on the projection plane S at a second speed faster than the first speed until the frame Fa of the projection image Qu_a contacts the outer edge of the drawn image Qu.

[0205] in addition, Fig.29 The dotted line in represents the position of the frame Fa of the projected image Qu_a at each patrol time, and the arrow represents the moving distance at each patrol time.

[0206] While the operation of the operating member 523 continues, if the frame Fa of the projected image Qu_a contacts the outer edge of the depicted image Qu at the second speed, the processing process proceeds to step S20, and therefore, after the projected image Qu_a temporarily stops in contact with the outer edge of the depicted image Qu, the processing process is transferred to step S21.

[0207] In addition, if the frame Fa of the projected image Qu_a contacts the outer edge of the depicted image Qu at the first speed, the processing procedure skips step S20 and transfers to step S21. The contact described here is the first contact, so the processing procedure transfers to step S22. In step S22, the projected image Qu_a moves along the outer edge of the depicted image Qu.

[0208] Fig.301 is a diagram showing a state in which the vertex Aa in the frame Fa of the projected image Qu_a on the projection surface S contacts the outer edge of the image Qu, more specifically, the side connected by the vertices A and D, by continuing the operation of the operating member 521. As shown in the figure, when the frame Fa of the projected image Qu_a contacts the outer edge of the image Qu, the liquid crystal panel 100 is as follows: Fig.31 The projection image Qu_a is generated as shown.

[0209] At vertex Aa in contact with the outer edge of liquid crystal panel 100, the angle formed by vertices D, Aa and Da is smaller than the angle formed by vertices A, Aa and Ba. Therefore, in liquid crystal panel 100, vertex Aa moves toward vertex D having a smaller angle, that is, in the upward direction.

[0210] As such, when the operation of the operating member 523 is continued after the contact, in the liquid crystal panel 100, as shown in FIG. Fig.33 As shown, the vertex Aa of the projected image Qu_a moves in the upward direction from vertex A toward vertex D along the contacted side in the outer edge of the depicted image Qu, that is, the side connecting vertex A and vertex D. In addition, the moving speed may maintain the first speed or the second speed before the contact, or may be a third speed slower than the first speed.

[0211] After contact, an image Qu_a is projected on the liquid crystal panel 100. Fig.33 As shown, it moves, and thus, on the projection surface S, it is visually recognized as Fig.32 As shown, the vertex Aa of the projected image Qu_a moves in the direction from the vertex A to the vertex D along the outer edge of the drawn image Qu.

[0212] Fig.34 1 is a diagram showing a state in which the second contact has occurred in the projection surface S. Specifically, the diagram shows a state in which the vertex Aa in the frame Fa of the projection image Qu_a moves in the direction from the vertex A toward the vertex D while in contact with the outer edge of the depicted image Qu after the first contact, and the vertex Da in the frame Fa is in contact with the edge connecting the vertices C and D in the outer edge of the depicted image Qu.

[0213] When the second contact occurs on the projection surface S as shown in the figure, the liquid crystal panel 100 is as follows. Fig.35 The projection image Qu_a is generated as shown.

[0214] When the second contact occurs and the operating member 523 is operated, the projection image Qu_a cannot move according to the operation of the operating member, so the movement of the projection image Qu_a is prohibited in step S25. Therefore, even if the operation of the operating member 523 continues, the projection image Qu_a is still at the same position as viewed from the projection surface S. Fig.34The LCD panel 100 is shown in FIG. Fig.35 Stop at the position shown.

[0215] In addition, when the projected image Qu_a stops at Fig.34 or Fig.35 In the case of the position shown, even if other operating members 521 are operated, movement in the upward direction designated by the operating member 521 is not possible, and thus movement continues to be prohibited.

[0216] On the other hand, when the operating member 522 is operated, the projected image Qu_a can be moved in the downward direction specified by the operating member 522. Therefore, in step S24, the projected image Qu_a moves according to the operation of the operating member 522. Similarly, when the operating member 524 is operated, the projected image Qu_a can be moved in the right direction specified by the operating member 524. Therefore, in step S24, it moves according to the operation of the operating member 524.

[0217] In addition, the case where the movement before contact is in the left direction is described as an example, but the same is true for the movement in the right direction. Although not specifically shown in the figure, when the projected image Qu_a moves from Fig.26 When the position shown moves to the right, the vertex Ba contacts the outer edge of the liquid crystal panel 100. When the vertex Ba contacts the outer edge of the liquid crystal panel 100, the angle formed by the vertex C, Ba, and Ca is smaller than the angle formed by the vertex B, Ba, and Aa. Therefore, in the liquid crystal panel 100, the vertex Ba moves along the edge connected by the vertices B and C toward the vertex C, that is, upward.

[0218] Next, referring to the above flowchart, how the display of the projection image Qu_a changes when the user actually operates the operation element 525 for specifying enlargement is specifically described. In addition, here, regarding the projection image Qu_a, it is assumed that the image Qu is drawn on the projection surface S as follows: Fig.25 The distorted quadrilateral shown in FIG. 1 is a rectangular shape. In the depicted image Qu, the projected image Qu_a is digitally corrected to a rectangular shape. Fig.25 As shown in FIG. 1 , when the depicted image Qu and the projected image Qu_a are projected onto the projection surface S, a region having a Fig.26 Projected image Qu_a of the shape shown.

[0219] In this state, the user operates the operation element 525 for designating enlargement of the projection image Qu_a, for example. With this operation, the processing proceeds to steps S11, S12, S14, S26, and S28.

[0220] When the operation of the operating member 525 continues, the processing proceeds to step S29 in a state where the frame Fa of the projected image Qu_a does not contact the outer edge of the depicted image Qu, and the projected image Qu_a is magnified by a predetermined magnification in a similar shape with the center Cen as a reference on the projection surface S. The processing repeatedly executes steps S11, S12, S14, S26, S28, and S29 at each circuit time until the operation of the operating member 525 continues and contacts the outer edge.

[0221] Fig.36 : is a diagram showing a state where the projected image Qu_a is enlarged at a predetermined magnification on the projection surface S until the frame Fa of the projected image Qu_a contacts the outer edge of the depicted image Qu. Fig.36 The dotted line in represents the position of the frame Fa of the projected image Qu_a at each patrol time.

[0222] If the operation of the operating member 525 is continued, the frame Fa of the projected image Qu_a eventually comes into contact with the outer edge of the depicted image Qu.

[0223] Fig.36 The projection image Qu_a indicated by the solid line is a diagram showing a state in which the vertex Da in the frame Fa of the projection image Qu_a on the projection plane S contacts the outer edge of the image Qu, specifically, the side connecting the vertices C and D, as the operation of the operating element 525 continues.

[0224] In addition, even if one vertex of the frame Fa of the projection image Qu_a contacts the outer edge of the drawn image Qu on the projection plane S, the enlargement prohibition condition is not satisfied. Therefore, by repeating step S29, the projection image Qu_a continues to be enlarged.

[0225] However, when one vertex of the frame Fa of the projected image Qu_a contacts one side of the outer edge of the depicted image Qu, enlargement based on the center Cen cannot be performed, so the enlargement basis is changed to, for example, the vertex that contacts one side of the outer edge of the depicted image Qu. Fig.36 For example, when the vertex Da in the frame Fa of the projected image Qu_a contacts the side connected by the vertices C and D in the outer edge of the drawn image Qu, the basis for enlargement is changed to the vertex Da.

[0226] If the operation of the operating member 525 is still continued, another vertex in the frame Fa of the final projection image Qu_a contacts the outer edge of the depicted image Qu.

[0227] Fig.371 is a diagram showing a state in which another vertex Ba contacts the side connected by vertices B and C when the projection plane S is enlarged based on vertex Da in the frame Fa of the projection image Qu_a by continuing the operation of the operating member 525. In addition, Fig.37 The dotted line in Fig.36 The solid line projection image Qu_a in , that is, the vertex Da, is in contact with the side connected by vertices C and D that depicts the outer edge of the image Qu.

[0228] In addition, even if the two vertices of the projected image Qu_a are in contact with the outer edge of the drawn image Qu, the enlargement prohibition condition is not satisfied.

[0229] Therefore, by repeating step S29, the projected image Qu_a continues to be enlarged.

[0230] However, when the two vertices in the frame Fa of the projected image Qu_a are in contact with the outer edge of the depicted image Qu, it is impossible to enlarge the image based on any of the two vertices. Therefore, the projected image Qu_a is enlarged under the condition that the two vertices of the frame Fa of the projected image Qu_a are located on the outer edge of the depicted image Qu.

[0231] If the operation of the operating member 525 is still continued, another vertex in the frame Fa of the final projection image Qu_a contacts the outer edge of the depicted image Qu.

[0232] Fig.38 525 is a diagram showing a state in which, by continuing the operation of the operating member 525, in addition to the vertices Da and Ba in the frame Fa of the projected image Qu_a, another vertex Aa is in contact with the side connected by the vertices A and D on the projection surface S. In addition, Fig.38 The dotted line in Fig.37 The solid line projection image Qu_a in , that is, the state in which the vertices Da and Ba are respectively in contact with the outer edge of the depicted image Qu.

[0233] When the three vertices of the projected image Qu_a are in contact with the outer edges of the drawn image Qu, the enlargement prohibition condition is satisfied. Therefore, the enlargement of the projected image Qu_a is prohibited in step S30.

[0234] Since the state in which the enlargement prohibition condition is satisfied is a state in which the second contact cannot be released by movement, even if any of the operating elements 521 to 524 is operated, movement is prohibited in step S25 , and the projection image Qu_a is stopped.

[0235] However, even when the movement prohibition condition is satisfied, the operation of the operating element 526 for instructing reduction can be accepted (the determination result of step S26 is "No"), so the projected image Qu_a is reduced. Therefore, after reduction, the projected image Qu_a may be moved based on the operation of the operating elements 521 to 524 or enlarged based on the operation of the operating element 525.

[0236] In addition, in the embodiment, when the projection image Qu_a is enlarged by the operation of the operating member 525, the projection image Qu_a is enlarged in a similar shape and at a certain magnification (initial magnification) with the center Cen as a reference. Not limited to this structure, it can also be configured in the same way as the movement that if the operation of the operating member 525 continues for a time T that is greater than the threshold value Tth, the projection image Qu_a is enlarged at a magnification greater than the above-mentioned initial magnification. According to this structure, if the operation of the operating member 525 continues for a time T that is less than the threshold value Tth, the projection image Qu_a is enlarged at the initial magnification for each circuit time, so the projection image Qu_a is enlarged at the first speed. If the time T is greater than the threshold value Tth, the projection image Qu_a is enlarged at a magnification greater than the initial magnification for each circuit time, so the projection image Qu_a is enlarged at a second speed faster than the first speed.

[0237] Furthermore, when the projection image Qu_a is enlarged by the operation of the operating element 525 and contacts the outer edge of the drawn image Qu at the second speed, the projection image Qu_a may be temporarily stopped for a period St in the same manner as when it moves.

[0238] According to this configuration, similar to movement, the operability for the user is improved.

[0239] In addition, in this configuration, the period St may be set or changed before amplification.

[0240] A comparative example for illustrating the superiority of the present embodiment will be described. In the comparative example, the projected image Qu_a is moved on the liquid crystal panel 100 in the direction specified by the operating elements 521 to 524 until it contacts the outer edge of the drawn image Qu.

[0241] In the comparative example, for example, when the projected image Qu_a is moved to the left by the operation of the operating member 523 and contacts the outer edge of the depicted image Qu, in order to move the projected image Qu_a upward, it is necessary to operate the operating member 521 which is different from the previous operating member. That is, in the comparative example, it is necessary to operate two different operating members in two times. In contrast, in the present embodiment, by continuing the operation of the same operating member 523, it is moved from the left to the top, so the operability of the user is improved.

[0242] In addition, in the comparative example, for example, in the projected image Qu_a such as Fig.34 or Fig.35 In the case where the image is located at the upper left end of the drawn image Qu as shown, in order to return to Fig.32 or Fig.33 In the position shown, it is necessary to operate the operating member 522 after operating the operating member 524. In contrast, in the present embodiment, it is sufficient to operate the operating member 522, so the operability of the user is improved.

[0243] According to the projection method of this embodiment, after the projection image Qu_a contacts the outer edge of the maximum projection range of the depicted image Qu by operating the operating members 521 to 524 for specifying the movement of the projection image Qu_a, if the operating member is operated, the projection image Qu_a moves along the contacted outer edge. Therefore, from the user's point of view, there is no need to change the movement direction, so the operability is improved.

[0244] In addition, when the operating element 525 for enlarging the designated projection image Qu_a is operated so that the projection image Qu_a contacts the outer edge and then the operating element is operated, the projection image Qu_a similarly moves along the contacted outer edge. Therefore, the user does not need to change the moving direction, thereby improving operability.

[0245] In addition, in an embodiment, if the operation of any one of the operating members 521 to 524 lasts for a time less than a threshold value Tth, the projected image Qu_a moves at a first speed, and if the time is greater than the threshold value Tth, the projected image Qu_a moves at a second speed faster than the first speed, thereby providing operability that reflects the user's intention.

[0246] In addition, in a configuration in which the projection image Qu_a is enlarged at a second speed faster than the first speed when the operation of the operating element 525 continues for a time period equal to or longer than the threshold value Tth, operability that reflects the user's intention is similarly provided.

[0247] In this embodiment, when the projected image Qu_a contacts the outer edge of the depicted image Qu at a second speed faster than the first speed, the movement of the projected image Qu_a is temporarily stopped during the period St before the projected image Qu_a moves along the outer edge, which provides the user with a surplus of time for operation. Thus, the operability for the user is further improved.

[0248] In addition, in a structure in which the projection image Qu_a is enlarged at a first speed if the operation of the operating member 525 lasts for a time less than a threshold value Tth, and is enlarged at a second speed faster than the first speed if the time is greater than the threshold value Tth, the projection image Qu_a is temporarily stopped when it contacts the outer edge of the depicted image Qu, and thus, as with movement, the user's operability is improved.

[0249] The period St can be set or changed before moving or enlarging, so the period of the temporary stop can be adjusted to suit the user's preference.

[0250] In addition, in the embodiment, when the projection image Qu_a is brought into contact with the outer edge of the depicted image Qu by operating any one of the operating members 521 to 524, if the operation of the operating member continues, the projection image Qu_a is moved in a direction represented by a composite vector of a vector of a moving direction specified by the operating member and a vector of a direction orthogonal to the moving direction when observed on the projection plane S in one of the two directions along the outer edge.

[0251] In this structure, the direction along the outer edge is different from the moving direction specified by the operating member, so the user may feel uncomfortable. Fig.30 As shown in FIG. 1 , when the projection image Qu_a contacts the outer edge of the depicted image by the operation of the operating member 523, if the operation of the operating member 523 continues, Fig.32 As shown, the projected image Qu_a moves on the outer edge in the direction from the vertex A to the vertex D. The direction from the vertex A to the vertex D is greatly different from the left direction specified by the operation of the operating member 523, so the user may feel uncomfortable.

[0252] Therefore, the embodiment may be modified as follows.

[0253] Specifically, first, a vector indicating a moving direction along the outer edge is decomposed into a vector of the moving direction specified by the operating element operated in a state where the projected image Qu_a is in contact with the outer edge of the drawn image Qu and a vector of a direction orthogonal to the moving direction.

[0254] Second, the magnitude of the vector in the moving direction designated by the operating element is compared with the magnitude of the vector in the direction orthogonal to the moving direction.

[0255] Third, if the magnitude of the vector in the moving direction specified by the operating member is smaller than the magnitude of the vector in the direction orthogonal to the moving direction, movement along the direction of the outer edge is prohibited after contact; if the magnitude of the vector in the moving direction is larger than the magnitude of the vector in the direction orthogonal to the moving direction, movement along the direction of the outer edge is permitted after contact.

[0256] For example, Fig.39 As shown, the state where the projected image Qu_a contacts the outer edge of the depicted image Qu is studied.

[0257] When the operating element 523 is operated to designate the left direction in this state, the vector AD indicating the moving direction along the outer edge can be decomposed into a leftward vector BaAa designated by the operating element 523 and an upward vector AaDa orthogonal to the vector BaAa.

[0258] In other words, the vector AD indicating the movement direction along the outer edge can be expressed by a composite vector of the leftward vector BaAa designated by the operating element 523 and the upward vector AaDa orthogonal to the vector BaAa.

[0259] In this case, since the size of vector BaAa is smaller than the size of vector AaDa, the projected image Qu_a is prohibited from moving in the direction of vector AD while in contact with the outer edge of the depicted image Qu through the operation of the operating member 523, and therefore, the projected image Qu_a does not move along the outer edge of the depicted image Qu.

[0260] On the other hand, research in Fig.40 The status shown, that is, Fig.39 In the same state, the operating tool 522 for designating the downward direction is operated. When viewed from the projection plane S, the vector DA indicating the moving direction along the outer edge can be decomposed into a downward vector DaAa designated by the operating tool 522 and a rightward vector AaBa orthogonal to the vector DaAa.

[0261] In other words, the vector DA indicating the movement direction along the outer edge can be expressed by a composite vector of the downward vector DaAa designated by the operating element 522 and the rightward vector AaBa orthogonal to the vector DaAa.

[0262] In this case, the magnitude of the vector DaAa is larger than the magnitude of the vector AaBa, and therefore the projection image Qu_a is allowed to move in the direction of the vector DA while being in contact with the outer edge of the drawn image by the operation of the operating element 522 .

[0263] According to this method, when the operating element is operated to continue the contact while the projected image Qu_a is in contact with the outer edge of the depicted image, the movement of the projected image Qu_a that the user feels uncomfortable with is prohibited, while the movement of the projected image Qu_a that is less uncomfortable is permitted. Therefore, the degree of discomfort that the user feels about the movement of the projected image Qu_a after the contact can be reduced.

[0264] Here, the description is given of the movement of the projection image Qu_a in a state where it contacts the outer edge of the drawn image. However, the same is applicable to the enlargement of the projection image Qu_a by changing the movement direction to the enlargement direction.

[0265] In the embodiments and modifications, the liquid crystal panel 100 (100R, 100G, 100B) is used as an example of a light modulator, but other examples may be used, such as an organic EL device, a reflector device, etc. In addition, a mirror device is a device that has a reflector for each pixel and switches the reflection direction of light electrostatically to turn it on or off.

[0266] The following is a summary of the present disclosure.

[0267] The projection method of Appendix 1 includes: a main body of a light modulation device that depicts a depicted image and a projection image obtained by reducing the depicted image and modulates light from a light source, projects the depicted image or the projection image onto a projection surface; accepts a first operation for moving the projection image relative to the projection surface or a second operation for enlarging the projection image; and when the projection image contacts an outer edge of the depicted image through the first operation or the second operation and the first operation or the second operation continues, moves the projection image along the outer edge according to the first operation or the second operation.

[0268] For example, when the main body is tilted relative to the projection surface and a depicted image is projected onto the projection surface, the outer shape of the maximum projection range is not a rectangle but a distorted quadrilateral. According to the projection method of Supplementary Note 1, after the projected image contacts the outer edge of the maximum projection range of the depicted image, when the first operation or the second operation is accepted, the projected image moves along the outer edge. Therefore, from the user's point of view, there is no need to change the moving direction, so the operability is improved.

[0269] In addition, the "depicted image" is an image modulated by a light modulating device. If the depicted image is projected from a direction perpendicular to the projection surface, it is a rectangle, but if it is projected in a state inclined relative to the projection surface, it is a distorted quadrilateral. The "projected image" is an image adjusted to, for example, a rectangle in the depicted image. The "outer edge" is the edge portion of the depicted image. "Contact" does not refer to physical contact, but refers to the geometric contact between the vertex or edge of the depicted pixel and the vertex or edge of the depicted image. The first operation or the second operation can typically be specified by operating physical keys such as arrow keys and cross keys, or by operating keys displayed on the screen.

[0270] Projection method of Appendix 2 In Appendix 1, when the projected image contacts the outer edge through the first operation or the second operation and the direction of movement specified by the first operation or the direction of enlargement specified by the second operation and the direction of the outer edge contacted by the projected image meet specified conditions, the projected image is not moved along the outer edge regardless of the first operation or the second operation.

[0271] When the projected image contacts the outer edge of the depicted image by the first operation or the second operation, if the direction of movement specified by the first operation or the direction of enlargement specified by the second operation is greatly different from the direction of movement along the outer edge, the direction may be contrary to the user's intention. According to the projection method of Supplementary Note 2, it is possible to prevent the projected image from moving or enlarging in a direction that the user does not want.

[0272] In the projection method of Note 3 in Note 2, the prescribed condition is: when the movement vector of the projected image along the outer edge is represented by a synthetic vector of a first vector component and a second vector component, the first vector component is smaller than the second vector component, the first vector component is a vector component of the direction of movement specified by the first operation or the direction of enlargement specified by the second operation, and the second vector component is a vector component orthogonal to the direction of movement specified by the first operation or the direction of enlargement specified by the second operation.

[0273] The projection method of Supplement 4 is based on any one of Supplements 1 to 3, and when the duration of the first operation or the second operation is the first time, the projected image moves or enlarges at the first speed, and when the duration is the second time longer than the first time, the projected image moves or enlarges at the second speed faster than the first speed. When the first operation or the second operation is accepted at the second time longer than the first time, it is considered that the user has the intention to quickly move or enlarge the depicted image. According to the projection method of Supplement 4, when the first operation or the second operation is accepted at the second time, the projected image moves or enlarges at the second speed faster than the first speed. Therefore, operability that reflects the user's intention is provided.

[0274] In the projection method of Note 5 in Note 4, when the projected image contacts the outer edge at the second speed and the first operation or the second operation continues, the movement or enlargement of the projected image stops during the first period before the projected image moves along the outer edge according to the first operation or before the projected image is enlarged along the outer edge according to the second operation.

[0275] From the user's perspective, when the projected image contacts the outer edge of the depicted image at a second speed faster than the first speed, the projected image moves in a direction along the outer edge of the depicted image that is different from the previous movement of the projected image, and thus the projected image may move in a direction that the user does not want. According to the projection method of Supplementary Note 5, the movement is temporarily stopped at the time when the projected image contacts the outer edge of the depicted image at the second speed, so that the user has extra time for operation. As a result, the operability for the user is further improved.

[0276] The projection method of Supplementary Note 6 is the method according to Supplementary Note 5, wherein a third operation for setting or changing the first period is accepted before the first operation or the second operation is accepted. According to the projection method of aspect 6, an optimal period for the user can be set.

[0277] The projector of Appendix 7 includes: a light modulation device that depicts a depicted image and a projection image obtained by reducing the depicted image; a projection lens that is used to project the depicted image or the projection image onto a projection surface; an operating member that indicates a first operation for moving the projection image relative to the projection surface or a second operation for enlarging the projection image; and a control device that moves the projection image along the outer edge of the depicted image according to the first operation or the second operation specified by the operating member when the projection image contacts the outer edge of the depicted image due to the first operation or the second operation specified by the operating member and the first operation or the second operation continues.

[0278] According to the projector of Supplementary Note 7, similarly to Supplementary Note 1, from the user's perspective, there is no need to take the trouble of changing the moving direction, so the operability is improved.

[0279] The program of Appendix 8 causes a computer that controls a light modulator to execute processing, wherein the light modulator depicts a depicted image and a projection image obtained by reducing the depicted image, and modulates light from a light source, wherein the processing is: projecting the depicted image or the projection image onto a projection surface; accepting a first operation for moving the projection image relative to the projection surface or a second operation for enlarging the projection image; and when the projection image contacts an outer edge of the depicted image through the first operation or the second operation and the first operation or the second operation continues, moving the projection image along the outer edge according to the first operation or the second operation.

[0280] According to the program of Supplementary Note 8, similarly to Supplementary Note 1, from the user's perspective, there is no need to take the time to change the moving direction, so the operability is improved.

Claims

1. A projection method, comprising: A main body provided with a light modulating device for depicting a depicted image and a projected image obtained by reducing the depicted image and modulating light from a light source projects the depicted image or the projected image onto a projection surface; receiving a first operation for moving the projection image relative to the projection surface or a second operation for enlarging the projection image; and When the projection image comes into contact with an outer edge of the drawn image by the first operation or the second operation and the first operation or the second operation continues, the projection image is moved along the outer edge according to the first operation or the second operation.

2. The projection method according to claim 1, wherein: When the projected image contacts the outer edge through the first operation or the second operation and the direction of movement specified by the first operation or the direction of enlargement specified by the second operation and the direction of the outer edge contacted by the projected image satisfy specified conditions, the projected image is not moved along the outer edge regardless of the first operation or the second operation.

3. The projection method according to claim 2, wherein: The prescribed condition is: when the movement vector of the projected image along the outer edge is represented by a composite vector of a first vector component and a second vector component, the first vector component is smaller than the second vector component, the first vector component is a vector component of the movement direction specified by the first operation or the magnification direction specified by the second operation, and the second vector component is a vector component orthogonal to the movement direction specified by the first operation or the magnification direction specified by the second operation.

4. The projection method according to any one of claims 1 to 3, wherein: When the duration of the first operation or the second operation is a first time, the projected image is moved or enlarged at a first speed. When the duration is a second time longer than the first time, the projection image moves or enlarges at a second speed faster than the first speed.

5. The projection method according to claim 4, wherein: When the projected image contacts the outer edge at the second speed and the first operation or the second operation continues, the movement or enlargement of the projected image stops during the first period before the projected image moves along the outer edge according to the first operation or before the projected image is enlarged along the outer edge according to the second operation.

6. The projection method according to claim 5, wherein: Before accepting the first operation or the second operation, a third operation for setting or changing the first period is accepted.

7. A projector, comprising: A light modulation device for depicting a depicted image and a projected image obtained by reducing the depicted image; a projection lens for projecting the depicted image or the projected image onto a projection surface; an operating member for indicating a first operation for moving the projection image relative to the projection surface or a second operation for enlarging the projection image; and A control device that moves the projected image along the outer edge according to the first operation or the second operation specified by the operating member when the projected image contacts the outer edge of the depicted image and the first operation or the second operation continues.

8. A program product that causes a computer that controls a light modulation device to execute a process that modulates light from a light source by drawing a drawn image and a projection image obtained by reducing the drawn image, wherein: projecting the depicted image or the projected image onto a projection surface; receiving a first operation for moving the projection image relative to the projection surface or a second operation for enlarging the projection image; and When the projection image comes into contact with an outer edge of the drawn image by the first operation or the second operation and the first operation or the second operation continues, the projection image is moved along the outer edge according to the first operation or the second operation.

Images