JP4586370B2 - Projection display device and projection display method - Google Patents

Description

  The present invention relates to a projection display device and a projection display method for projecting and displaying an image on an external screen or the like.

  Conventionally, as a projection display device that replaces OHP (Overhead Projector), a document is imaged into electronic data, and an image is displayed on a transmissive liquid crystal light valve based on the electronic data, and light is transmitted through the liquid crystal light valve. Thus, a projection display device with an imaging device that projects the image on a screen has been developed (see, for example, Patent Document 1 and Non-Patent Document 1).

  27 is a perspective view showing a conventional projection display device with an imaging device described in Patent Literature 1 and Non-Patent Literature 1, and FIG. 28 is a perspective view showing a lower unit of the projection display device with an imaging device. FIG. 29 is a diagram showing the operation of the projection display device with an imaging device, and FIG. 30 is a block diagram showing the flow of image information in the projection display device with an imaging device. As shown in FIG. 27, a conventional projection display device 101 with an imaging device is composed of an upper unit 102 and a lower unit 103, and the upper unit 102 is mounted on the lower unit 103.

  The upper unit 102 is provided with a frame 4 that fits over the lower unit 103. A rectangular opening 4a is formed in the frame 4, and a glass plate 105 on which a document is placed is fitted on the opening 4a. Further, side plates 6a each made of a trapezoidal antireflection plate extend downward from the four sides of the frame 4 and a bottom plate 6b made of an antireflection plate is provided at the lower end of the side plate 6a. ing. An imaging device 7 is attached to the bottom plate 6b. That is, the lens 7a (see FIG. 29) of the imaging device 7 is fitted in the opening of the bottom plate 6b, and an image of the document placed on the glass plate 105 is captured below the lens 7a via the lens 7a. An image sensor 7b (see FIG. 29) for digitizing image information is provided. As a result, the glass plate 105, the four side plates 6a, and the bottom plate 6b define an inverted square frustum-shaped space, the glass plate 105 forms the upper surface of the inverted square frustum shape, and the side plate 6a forms the side surface. The bottom plate 6b constitutes the lower surface. Then, one cold cathode tube 8 is provided on each of the back side of the side plate 6a, that is, two positions facing each other on the outside of the space. Light emitted from the cold cathode tube 8 is reflected by a reflecting plate (not shown) to indirectly illuminate the document. Furthermore, the frame 4 is provided with an operation panel (not shown) for controlling the operation of the projection display device 101 with an imaging device.

  An imaging surface cover 9 is attached to the frame 4. One end of the imaging surface cover 9 is rotatably connected to one end of the frame 4, and functions as a door-shaped cover for the glass plate 105. That is, when the imaging surface cover 9 is open, the glass plate 105 is exposed so that an original can be placed on the glass plate 105. When the imaging surface cover 9 is closed, the glass plate 105 is placed. Is covered by the imaging surface cover 9 so that external light can be prevented from entering the imaging device 7.

  As shown in FIG. 28, the lower unit 103 is provided with a casing 10, and power is supplied from the outside to the inside of the casing 10 to transform it and supply it to other parts in the apparatus. A power supply unit 11 is provided, and a lamp unit 12 that is supplied with power from the power supply unit 11 and emits light is provided. In addition, an optical system unit 13 is provided for adding an image to the light emitted from the lamp unit 12 based on the image data output from the imaging device 7 (see FIG. 27). A projection lens unit 14 is provided for projecting the added light toward an external screen (not shown). Further, a drive circuit 15 for driving the imaging device 7 and the optical system unit 13 is provided.

  In the optical system unit 13, a dichroic mirror 16R that reflects red light and transmits light of other colors is provided so as to be interposed in the optical path of the light emitted from the lamp unit 12, and the dichroic mirror is provided. A dichroic mirror 16G that reflects green light and transmits blue light is provided so as to be interposed in the optical path of light that has passed through 16R, and light that has passed through dichroic mirror 16G, that is, interposed in the optical path of blue light. Thus, a mirror 17a is provided. In addition, a mirror 17b is provided at a position where the red light reflected by the dichroic mirror 16R is irradiated, and a mirror 17c is provided at a position where the blue light reflected by the mirror 17a is irradiated. The liquid crystal light valve 18a is provided so as to be interposed in the optical path of red light reflected by the mirror 17b, and the liquid crystal light valve 18b is provided so as to be interposed in the optical path of green light reflected by the dichroic mirror 16G. The liquid crystal light valve 18c is provided so as to be interposed in the optical path of the blue light reflected by the mirror 17c. The liquid crystal light valves 18a, 18b, and 18c form red, green, and blue images based on the image data output from the imaging device 7, respectively. Further, there is provided a prism 19 in which light of each color transmitted through the liquid crystal light valves 18a, 18b, and 18c is incident and the light is integrated and emitted to the projection lens unit 14. The lamp unit 12, the optical system unit 13, and the projection lens unit 14 constitute a projection device 20 (see FIG. 29).

  Next, the operation of such a conventional projection display device with an imaging device will be described. First, an operation for imaging a document will be described. As shown in FIGS. 29 and 30, first, the document 21 is placed on the glass plate 105. At this time, the surface to be displayed on the document 21 is faced down so that the display surface is in contact with the glass plate 105. If the document 21 is a thin document, the imaging surface cover 9 is closed and the document 21 is sandwiched with the glass plate 105. Next, the power supply unit 11 supplies power to the cold cathode tube 8, and the cold cathode tube 8 emits light to illuminate the display surface of the document 21. Then, the imaging device 7 captures the display surface of the document 21 and converts the captured optical information into electronic information.

  Next, an operation for projecting a display image will be described. Based on the electronic information output from the imaging device 7, the liquid crystal light valves 18a to 18c of the optical system unit 13 form images. At this time, the light emitted from the lamp unit 12 passes through the liquid crystal light valves 18a to 18c, whereby the image is added to the light, and this image is projected onto the external screen 22 by the projection unit 14 and displayed.

  According to this conventional projection display device with an image pickup device, it is not necessary to prepare a document using a dedicated transparent film in advance as in an overhead projector (OHP), and the document is electronically stored in advance as in a projector for a personal computer. There is no need to convert the data into materials, and materials in various forms such as books handwritten or printed on plain paper or books can be projected and displayed as they are on an external screen. In addition, the projected image can be stored as electronic data.

  However, this conventional projection display device with an imaging device has the following problems. In a presentation site, it is often necessary to write on-the-spot an image displayed on the screen to add new information. However, the above-described conventional projection display device with an imaging device cannot write the captured image information.

  For this reason, conventionally, in order to write in the captured image information, an input device such as a personal computer, an input tablet, or an electronic boat is connected to the projection display device with the image pickup device, and the image pickup is performed by operating the input device. The image information is written.

  In addition, an image is displayed on the whiteboard by the above-described projection display device with an imaging device, written on the whiteboard with a whiteboard marker, and this information is captured by an external camera, and this information is displayed on the projection display with the imaging device. A method of recording by the apparatus is also disclosed (for example, see Patent Document 2).

  Furthermore, a technique is also disclosed in which a transparent sheet and an indicating stick that have been written are inserted so as to be interposed in an optical path in a projection display device with an imaging device, and are displayed superimposed on the captured image (for example, Patent Documents). 3).

Japanese Patent Application Laid-Open No. 07-036116 Nippon Avionics Co., Ltd. website (http://www.avio.co.jp/products/mp/mp_index.htm) JP 2001-312001 A Japanese Patent Application Laid-Open No. 08-054592

  However, the conventional techniques described above have the following problems. In a method in which an input device such as a personal computer is connected to the projection display device and writing is performed using this input device, the user (presenter) must operate the input device in addition to the projection display device. The work becomes complicated and the presentation is disturbed. Further, since an input device such as a personal computer is required, the equipment cost increases and the portability decreases.

  Also in the technique described in Patent Document 2, an external camera is required in addition to the projection display device, and the user must move away from the projection display device to the whiteboard every time writing is performed. Therefore, the work becomes complicated. In addition, since an external camera is required, the equipment cost increases and portability decreases.

  Furthermore, in the technique described in Patent Document 3, a transparent sheet for writing must be prepared in advance, and editing work such as writing on a display image can be easily performed at the presentation site. I can't. In addition, there is a problem that the writing information cannot be left as electronic data.

  The present invention has been made in view of such a problem, and an object thereof is to provide a projection display device and a projection display method in which writing on a display image is easy.

The projection display device according to the first aspect of the present invention is a projection display device that projects an image to the outside and displays the image, and a writing display for inputting writing information for the image. An external projection device for projecting the image and the write information to the outside, and the image and the write information to the display for writing. An internal projection device for projecting and displaying the image, wherein the internal projection device captures a document before projecting the image to obtain the image, and the writing display is configured to capture the document. An imaging surface cover for supporting the original, wherein the writing display is switched between a transparent plate fixed to the internal projection device and whether the transparent plate is exposed or covered. The imaging surface cover includes a screen that displays the image and the writing information projected by the internal projection device, and an input tablet that is superimposed on the screen and receives the writing information. It is characterized by having. Thus, when the document is imaged, the internal projection device images the document placed on the transparent plate, and when the image is projected, the document is removed from the transparent plate and the imaging surface cover is removed. The transparent plate is covered and the image is projected onto the screen. As a result, the liquid crystal panel can be omitted. In the present invention, “writing” includes editing work such as erasing a part of the original image.

A projection display method according to a second aspect of the present invention is a projection display method for projecting and displaying an image, an imaging step of capturing an image of a document and obtaining the image, and projecting the image onto a writing display. A writing information input step for inputting the writing information to the writing display, and an external projection step for projecting the image and the writing information to the outside of the projection display device. The display includes a transparent plate and an imaging surface cover that can be switched between exposing and covering the transparent plate, and the imaging surface cover includes a screen on which the image and the writing information are projected, and the screen. And an input tablet on which the writing information is input. The imaging step includes exposing the transparent plate so that the transparent plate supports the document and passing through the transparent plate. in front Imaging the document, and the writing information input step is a step in which the imaging surface cover covers the transparent plate, the image is projected onto the screen, and the writing information is input to the input tablet. It is characterized by .

  According to the present invention, it is possible to provide a projection display device in which writing on a display image is easy by providing a writing display for displaying an image and inputting writing information on the image.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. First, a first embodiment of the present invention will be described. FIG. 1A is a perspective view showing a projection display device with an imaging device according to this embodiment, and FIG. 1B is a cross-sectional view showing an upper unit of the projection display device with an imaging device, and FIG. FIG. 3 is a sectional view showing a writing display of the projection display device with an imaging device, FIG. 3B is a sectional view showing the liquid crystal panel, and FIGS. 3A and 3B are views of the writing display. FIGS. 4A and 4B are cross-sectional views showing the operation of the liquid crystal panel of the writing display, and FIG. 5 is the writing display. FIG. 6 is an optical model diagram showing an external projection device of the projection display device with an imaging device.

  As shown in FIGS. 1A and 1B, a projection display device 1 with an imaging device according to the present embodiment (hereinafter also simply referred to as a display device 1) is composed of an upper unit 2 and a lower unit 3. The upper unit 2 is mounted on the lower unit 3. In the upper unit 2, a frame 4 that fits in the upper part of the housing 10 of the lower unit 3 is provided. A rectangular opening 4a is formed in the frame 4, and a writing display 5 on which an original can be placed, an image can be displayed, and information can be input by pen input is fitted in the opening 4a. It is. That is, the display device 1 is provided with a writing display 5 instead of the glass plate 105 (see FIG. 27) in the above-described conventional projection display device with an imaging device.

  Further, side plates 6a each made of a trapezoidal antireflection plate extend downwardly from the four side portions of the frame 4, and a bottom plate 6b is connected to a lower end of the side plate 6a. And the imaging device 7 and the small projection apparatus 26 are attached to the opening part of the baseplate 6b. The imaging device 7 and the small projection device 26 constitute an internal projection device. A lens 7 a is provided on the upper surface of the imaging device 7 so as to face the writing display 5, and an imaging element 7 b that captures an image through the lens 7 a and digitizes it is provided below the lens 7 a. ing. Further, a lens 26a is provided on the upper surface of the small projection device 26 so as to face the writing display 5, and a liquid crystal light valve 26b is provided below the lens 26a, and below the liquid crystal light valve 26b. Is provided with a light source 26c. The writing display 5, the four side plates 6 a, and the bottom plate 6 b define an inverted quadrangular pyramid shaped space. That is, the writing display 5 constitutes the upper surface of the inverted quadrangular pyramid, the side plate 6a constitutes the side surface, and the bottom plate 6b constitutes the lower surface. Then, one cold cathode tube 8 is provided on each of the back side of the side plate 6a, that is, two positions facing each other on the outside of the space. Light emitted from the cold cathode tube 8 is reflected by a reflecting plate (not shown) to indirectly illuminate the document. Further, the frame 4 is provided with an operation panel (not shown) for controlling the operation of the display device 1.

  An imaging surface cover 9 is connected to one end of the frame 4 so that one end of the imaging surface cover 9 can be rotated, and functions as a door-shaped cover for the writing display 5. That is, when the imaging surface cover 9 is open, the writing display 5 is exposed and a document can be placed thereon. When the imaging surface cover 9 is closed, the writing display 5 is Covered with the cover 9, external light can be prevented from entering the imaging device 7. Further, the one end of the imaging surface cover 9 can be removed from the frame 4, and when imaging a thick document such as a book, the imaging surface cover 9 can be removed to capture an image.

  As shown in FIGS. 2A and 2B, the writing display 5 includes a liquid crystal panel 27 and an input tablet (touch panel) 28 that are overlapped. The liquid crystal panel 27 is provided with two glass plates 29 arranged so as to face each other, and a transparent electrode 30 is formed on the surface of each glass substrate 29 facing the other glass substrate. A sealing agent 31 formed in a frame shape is disposed between the glass plates 29, and a polymer dispersed liquid crystal 32 is sealed between the glass substrates 29 between the sealing agents 31. Yes. The polymer dispersed liquid crystal 32 is obtained by dispersing liquid crystal liquid droplets 34 in a transparent polymer resin 33 cured by ultraviolet rays.

  A method for manufacturing the liquid crystal panel 27 will be described. First, as shown in FIG. 3A, the transparent electrode 30 is formed on the surfaces of the two glass substrates 29. Then, the glass substrate 29 is overlapped via a sealing agent 31 formed in a frame shape and solidified so that the surfaces on which the transparent electrodes 30 are formed face each other. At this time, an opening is formed in the sealing agent 31. Next, as shown in FIG. 3B, a polymer dispersed liquid crystal 32 is injected from the opening of the sealing agent 31 into a portion surrounded by the sealing agent 31 between the two glass plates 29. Seal the part. Then, the polymer resin of the polymer dispersed liquid crystal 32 is cured by irradiating ultraviolet rays UV from the outside. Thereby, the liquid crystal panel 27 is produced.

  As shown in FIG. 4A, in the liquid crystal panel 27, when a voltage is applied between the transparent electrodes 30, the liquid crystal droplets 34 dispersed in the polymer resin 33 of the polymer dispersed liquid crystal 32 are integrated. Thus, the incident light 35 is transmitted. Further, as shown in FIG. 4B, when no voltage is applied between the transparent electrodes 30, the liquid crystal droplets 34 are randomly oriented and light 35 is scattered. The liquid crystal panel 27 itself does not form an image, but functions as a transmission plate and a scattering plate as a whole.

  As shown in FIG. 5, the input tablet 28 is a resistive film type touch panel, for example. In the input tablet 28, a glass substrate 36 is provided, a transparent electrode 37 is formed on the upper surface of the glass substrate 36, and a plurality of insulating spacers 38 are provided on the transparent electrode 37. . A transparent film 39 is provided on the spacer 38, and a transparent electrode 40 is formed on the surface of the transparent film 39 on the side facing the glass substrate 36. In the input tablet 28, the transparent electrodes 37 and 40 are separated from each other by a spacer 38 when no pressure is applied from the outside. However, when pressure is applied from the outside by the pen 41, the portion of the transparent film 39 that is pressed by the pen 41 bends, and the transparent electrode 40 comes into contact with the transparent electrode 37 and becomes conductive. At this time, by measuring the change in the resistance value between the transparent electrode 37 and the transparent electrode 40, the position where the pen 41 is pressed can be specified. As a result, the user can input information by drawing characters or figures on the input tablet 28 with the pen 41.

  The configuration of the lower unit 3 in the display device 1 is the same as the configuration of the lower unit 103 in the conventional display device 101 described above. That is, as shown in FIG. 28, a housing 10 is provided, and a power supply unit 11 is supplied to the inside of the housing 10 from the outside, transforms it, and supplies it to other parts in the apparatus. Is provided. In addition, a lamp unit 12 that emits light when power is supplied from the power supply unit 11 is provided. Furthermore, an optical system unit 13 for adding an image to the light emitted from the lamp unit 12 based on the image data output from the imaging device 7 (see FIG. 1B) is provided. A projection lens unit 14 is provided that projects the light with the image added thereto toward an external screen (not shown). Furthermore, a drive circuit 15 for driving the imaging device 7 and the optical system unit 13 is provided.

  As shown in FIG. 6, in the optical system unit 13, a dichroic mirror 16 </ b> R that reflects red light and transmits light of other colors is interposed in the optical path of the light emitted from the lamp unit 12. A dichroic mirror 16G that reflects green light and transmits light of other colors is provided so as to be interposed in the optical path of light that has been transmitted through the dichroic mirror 16R, and is transmitted through the dichroic mirror 16G. A mirror 17a is provided so as to be interposed in the optical path of light, that is, blue light. In addition, a mirror 17b is provided at a position where the red light reflected by the dichroic mirror 16R is irradiated, and a mirror 17c is provided at a position where the blue light reflected by the mirror 17a is irradiated. A liquid crystal light valve 18a is provided so as to be interposed in the optical path of red light reflected by the mirror 17b, and a liquid crystal light valve 18b is provided so as to be interposed in the optical path of green light reflected by the dichroic mirror 16G. A liquid crystal light valve 18c is provided so as to be interposed in the optical path of the blue light reflected by the mirror 17c. The liquid crystal light valves 18a, 18b and 18c form red, green and blue images based on the electronic information output from the imaging device 7 and the input tablet 28, respectively. That is, unlike the above-described conventional display device, information input via the input tablet 28 is input to the drive circuit 15 and is superimposed on the image captured by the image capturing device 7 and is applied to the liquid crystal light valves 18a to 18c. It is supposed to be formed. Further, light of each color to which an image is added through the liquid crystal light valves 18a, 18b and 18c is incident on the optical system unit 13, and these lights are integrated and emitted to the projection lens unit 14. A prism 19 is provided. The lamp unit 12, the optical system unit 13, and the projection lens unit 14 constitute a projection device 20 as an external projection device.

  Next, the operation of the projection display device with an imaging apparatus 1 according to the present embodiment configured as described above, that is, the projection display method according to the present embodiment will be described. FIG. 7 is a block diagram showing a flow of image information in the projection display device with an imaging device according to the present embodiment, and FIG. 8A is a diagram showing an operation for imaging a document in the projection display device with the imaging device. (B) is a figure which shows the operation | movement which projects the imaged image and writes with respect to this image.

  First, an operation for imaging a document will be described. As shown in FIGS. 7 and 8A, first, the document 21 is placed on the writing display 5. At this time, the surface of the document 21 to be displayed is faced down, and this display surface is in contact with the input tablet 28 of the writing display 5. If the document 21 is a thin document, the imaging surface cover 9 is closed and the document 21 is sandwiched together with the writing display 5. If the document 21 is a thick document such as a book, the imaging surface cover 9 is removed from the frame 4. As a result, the writing display 5 supports the document 21. At this time, a voltage is applied to the liquid crystal panel 27 of the writing display 5, the orientation of the liquid crystal droplets 34 is uniform, and the liquid crystal panel 27 is in a transmission mode. Next, the power supply unit 11 supplies power to the cold cathode tube 8, the cold cathode tube 8 emits light, and illuminates the display surface of the document 21 through the writing display 5. Then, the imaging device 7 images the display surface of the document 21 via the writing display 5 and converts the captured optical information into electronic information.

  Next, an operation for projecting a display image on the screen and an operation for writing the image will be described. First, the original 21 is removed from the writing display 5, the voltage applied to the liquid crystal panel 27 is cut off, the orientation of the liquid crystal droplets 34 is randomized, and the liquid crystal panel 27 is set to the scattering mode. Then, the imaging device 7 outputs electronic information to the projection device 20 and the small projection device 26. The projection device 20 projects an image on an external screen 22 based on the electronic information. The small projection device 26 projects the same image (writing image) as the image projected on the screen 22 by the projection device 20 onto the liquid crystal panel 27 in the scattering mode. At this time, since the input tablet 28 is transparent, the user can see the writing image on the writing display 5. At this time, if necessary, a part of the captured image can be enlarged and projected onto the liquid crystal panel 27 and the screen 22.

  Next, as shown in FIG. 5, the user writes on the input tablet 28 using the pen 41 so as to overwrite the writing image while viewing the writing image displayed on the liquid crystal panel 27. Enter information. At this time, the portion pressed by the pen 41 in the transparent film 39 is bent, the transparent electrode 40 comes into contact with the transparent electrode 37, and the resistance value between the transparent electrode 40 and the transparent electrode 37 changes. Then, by measuring the change in the resistance value, information is input to the drive circuit 15, and this information is output from the drive circuit 15 to the projection device 20 and the small projection device 26.

  As a result, as shown in FIG. 7, both the electronic information output from the imaging device 7 and the electronic information input from the input tablet 28 are input to the projection device 20, and the optical system is based on these electronic information. The liquid crystal light valves 18a to 18c of the unit 13 form an image. At this time, the light emitted from the lamp unit 12 is transmitted through the liquid crystal light valves 18 a to 18 c, so that an image is added, and this image is projected onto the external screen 22 by the projection unit 14. As a result, both the document 21 and the user writing information are displayed on the screen 22. The same information is also projected on the liquid crystal panel 27. Furthermore, both the document 21 and user writing information are recorded in the drive circuit 15. Note that the above-described writing work includes editing work such as erasing a part of the writing image.

  As described above, according to the present embodiment, the user can write additional information by overwriting the image while viewing the image on the writing display 5. For this reason, the user does not need to operate another input device such as a personal computer, and the user does not need to leave the projection device with the imaging device, and can easily perform writing. In addition, since a state in which additional information is written on the imaged document is displayed in real time on the external screen, the viewer can accurately understand the intention of the user (presenter). Furthermore, a part of the captured image can be enlarged and projected onto the liquid crystal panel 27 as necessary, and writing can be performed on the enlarged image. Therefore, precise writing exceeding the accuracy of the input tablet is possible. It can be performed.

  Further, in the present embodiment, since no other input device for writing is required, it is possible to reduce the size of the device necessary for the presentation and reduce the equipment cost. Furthermore, various forms of materials can be used as a manuscript as they are, and the manuscript can be easily edited on a writing display such as writing and erasing. Furthermore, the written information can be stored as electronic data together with the captured image. Furthermore, the liquid crystal panel 27 provided in the display device of this embodiment does not need to display an image by itself, and thus has a simple structure and can be manufactured at low cost.

  In the present embodiment, a projection apparatus using a liquid crystal light valve is used as the small projection apparatus 26, but a projection apparatus using a digital micromirror device (DMD) or the like may be used.

  Next, a first modification of the first embodiment will be described. FIG. 9 is a perspective view showing the upper unit of the display device according to the first modification. In the first embodiment described above, an example in which the writing display includes a resistive film type input tablet has been described. However, in the present modification, the writing display includes an infrared blocking input device. ing. As shown in FIG. 9, in this modification, a plurality of light emitting elements 52 are arranged in a row on two sides adjacent to each other in the frame 4, and the light emitting elements 52 are arranged on the other two sides adjacent to each other. A plurality of corresponding light receiving elements 53 are arranged in one row. The light emitting element 52 outputs the infrared ray 54 toward the light receiving element 53, and the light receiving element 53 detects the infrared ray 54. When the user draws a figure on the liquid crystal panel 27 with the pen 55, the infrared ray 54 is blocked by the pen 55, and the position of the pen 55 is recognized. Thereby, writing can be performed on the captured image. A figure may be drawn with a user's finger or the like instead of the pen 55.

  Next, a second modification of the first embodiment will be described. FIG. 10 is a diagram showing an upper unit of a display device according to the second modification. As shown in FIG. 10, in this modification, the writing display includes an infrared light emitting pen type input device. In this modification, the user draws a figure while pressing the tip of the input pen 57 against the liquid crystal panel 27 using the input pen 57 that emits infrared light 56 from the tip when the tip is pressed. Then, the imaging device 7 detects this infrared ray 56 and recognizes the position of the input pen 57. Thereby, writing can be performed on the captured image. At this time, the imaging device 7 performs a process of identifying the infrared ray 56 from the image signal projected by the small projection device 26 as necessary.

  Next, a third modification of the first embodiment will be described. FIG. 11 is a perspective view showing an upper unit of a display device according to the third modification. As shown in FIG. 11, in this modification, the writing display includes an input device of an ultrasonic triangulation method. In this modification, the user performs writing using the input pen 58. The input pen 58 includes a pressure sensor (not shown) that detects whether or not the tip of the input pen 58 is being pressed, and an ultrasonic wave from the tip of the input pen 58 when the pressure sensor detects pressure. And an ultrasonic generator (not shown) for generating. In addition, a detector 59 for detecting ultrasonic waves is provided on one side of the frame 4 and the other side adjacent to the one side. Accordingly, when the user draws a figure while pressing the input pen 58 against the liquid crystal panel 27, the input pen 58 generates an ultrasonic wave, and the two detectors 59 detect the ultrasonic wave generation position by the triangulation method, that is, the input pen 58. Recognize the tip position. Thereby, writing can be performed on the captured image.

  Next, a fourth modification of the first embodiment will be described. FIG. 12 is a cross-sectional view showing an upper unit of a display device according to the fourth modification. As shown in FIG. 12, in this modification, the writing display includes an electromagnetic induction type input device. In this modification, the user performs writing using the input pen 60. The input pen 60 includes a coil 61. A liquid crystal panel 27 is laminated on a tablet 63 provided with a sensor (not shown) for detecting a magnetic field and an electrode (not shown) for generating a magnetic field. The electrode forms a magnetic field 64 on the surface of the tablet 63, and the input pen 60 moves therethrough, whereby a current flows in the coil 61 built in the input pen 60, and this current forms a magnetic field 62 around the coil 61. Is done. The magnetic field 62 is detected by the sensor of the tablet 63. By repeating this operation in a short cycle, the locus of the input pen 60 can be recognized. Thereby, writing can be performed on the captured image.

  Next, a fifth modification of the first embodiment will be described. FIG. 13 is a diagram showing a projection display device with an imaging device according to the fifth modification. In the first embodiment described above, an example in which the cold cathode tube 8 (see FIG. 1) illuminates the document 21 at the time of image capturing of the document has been described. However, the display device of this modification is provided with a cold cathode tube. The light source 26c of the small projection device 26 illuminates the document 21. Thereby, the cold cathode tube can be omitted, and the cost can be reduced.

  Next, a modification of the small projection device incorporated in the display device will be described. Table 1 shows examples of small projection apparatuses that can be used in this embodiment. As shown in Table 1, the small projection apparatus includes a method using a transmissive light valve as an image forming apparatus, a method using a reflective light valve, and a method using a digital micromirror device (DMD). . In addition, a method of using a transmissive light valve and a method of using a reflective light valve as an image forming apparatus include a three-plate type using three panels (light valves) for RGB colors, There is a single plate type that uses a panel. In addition, the single-plate type uses a color filter method, which is a color mixing method of area division in which one pixel of a panel is formed by RGB sub-pixels using a color filter, and a monochrome panel is used for the panel. There is a color sequential method that is a time-division color mixing method that switches to RGB at high speed. The three-plate type uses RGB three-color light sources, the color filter method uses a white light source, and the color sequential method uses a light source capable of switching the light color among the three RGB colors at a high speed as described above. Further, when a DMD is used as the image forming apparatus, a white light source and a color wheel are used.

  Hereinafter, No. 1 shown in Table 1 will be described. 1 (three-plate type of transmission type light valve) is shown in the sixth and seventh modifications of the first embodiment. 2 (transmission type light valve color filter system) is shown in the eighth modification. 3 (color sequential system of transmission type light valve) is shown in the ninth modified example. 4 (a three-plate type of a reflective light valve) is shown in the tenth and eleventh modified examples. 5 (reflective light valve color filter system) is shown in the twelfth modification. 6 (reflective light valve color sequential method) is shown in the thirteenth modification, and the DMD method is shown in the fourteenth modification.

  First, a sixth modification of the first embodiment, that is, No. 1 shown in Table 1. 1 (transmission type 3 plate type) will be described. FIG. 14 is a diagram showing a projection display device with an imaging device according to this modification. As shown in FIG. 14, in the display device according to the present modification, surface light sources 81 </ b> R, 81 </ b> G, and 81 </ b> B of RGB colors are provided as light sources in the small projection device. The surface light sources 81R, 81G, and 81B include LEDs (Light Emitting Diodes) and a light guide plate, and emit light in a planar shape. In addition, monochrome transmissive liquid crystal light valves 82R, 82G, and 82B that form images for the respective colors are provided so as to be interposed in the optical paths of light emitted from the surface light sources. Further, a prism 83 is provided at a portion where light transmitted through the liquid crystal light valves 82 R, 82 G, and 82 B intersects, and a lens 84 is provided between the prism 83 and the writing display 5. On the other hand, in the imaging device 7, a monochrome CCD (Charge-Coupled Device) is provided as the imaging device 7b.

  Next, the operation of this modification, that is, the projection display method according to this modification will be described. When imaging a document, the surface light sources 81R, 81G, and 81B are sequentially turned on to illuminate the document. At this time, the monochrome CCD sequentially captures the image of the document, and then combines the images for the three colors, thereby enabling full-color image recognition. Further, when projecting an image, the surface light sources 81R, 81G, and 81B emit light of each color, and these lights are transmitted through the transmissive liquid crystal light valves 82R, 82G, and 82B, respectively, thereby adding an image of each color. Then, the light beams of the respective colors are combined in the prism 83, spread by the lens 84, and projected onto the writing display 5.

  In this modification, a small projection device can be miniaturized by using a surface light source including LEDs of RGB colors and a light guide plate as a light source. Further, each surface light source 81R, 81G, 81B is sequentially turned on to illuminate the original, thereby eliminating the need for a cold cathode tube and using a monochrome CCD as an image pickup device. Imaging can be performed. Further, bright display is possible by using a monochrome liquid crystal light valve. Configurations, operations, and effects other than those described above in the present modification are the same as those in the first embodiment described above. The cold cathode fluorescent lamp and each surface light source may be turned on at the same time to illuminate the original and may be imaged by a color CCD.

  Next, a seventh modification of the first embodiment will be described. This modified example is No. 1 shown in Table 1. 1 (transmission type 3 plate type) is an example in which a white light source is used as a light source. FIG. 15 is a diagram showing a projection display device with an imaging device according to this modification. As shown in FIG. 15, in the display device according to this modification, the white light source 85 and red light are reflected instead of the surface light sources 81R, 81G, and 81B, as compared with the sixth modification described above. A dichroic mirror 86R that transmits other light, a dichroic mirror 86G that reflects green light and transmits other light, and mirrors 87a, 87b, and 87c that totally reflect light are provided. Specifically, in the small projection device, the dichroic mirror 86R, the dichroic mirror 86G, and the mirrors 87a and 87b are arranged in this order along the optical path of the light emitted from the white light source 85, and the transmitted light from the dichroic mirror 86G ( (Blue light) enters the transmissive liquid crystal light valve 82B. The reflected light (green light) of the dichroic mirror 86G is incident on the transmissive liquid crystal light valve 82B. Further, a mirror 87c is arranged on the optical path of the reflected light (red light) of the dichroic mirror 86R, and the reflected light of the dichroic mirror 86R is reflected by the mirror 87c and enters the transmissive liquid crystal light valve 82R. ing. On the other hand, in the imaging device 7, a monochrome CCD is provided as the imaging element 7b.

  Next, the operation of this modification, that is, the projection display method according to this modification will be described. The white light source 85 emits white light, and this light enters the dichroic mirror 86R. As a result, red light of the white light is reflected by the dichroic mirror 86R, reflected by the mirror 87c, and enters the transmissive liquid crystal light valve 82R. Of the light transmitted through the dichroic mirror 86R, green light is reflected by the dichroic mirror 86G and enters the transmissive liquid crystal light valve 82G. Further, the light (blue light) transmitted through the dichroic mirror 86G is reflected by the mirrors 87a and 87b and enters the transmissive liquid crystal light valve 82B.

  When the document is imaged, one of the transmissive liquid crystal light valves 82R, 82G, and 82B is set to the transmissive state and the other two are set to the non-transmissive state, so that each color light sequentially illuminates the document. At this time, the monochrome CCD sequentially captures the image of the document, and then combines the images for the three colors, thereby enabling full-color image recognition. Further, when projecting an image, the light of each color is transmitted through the transmission type liquid crystal light valves 82R, 82G, and 82B, and the image of each color is added. The light of each color is synthesized by the prism 83 and is expanded by the lens 84. And projected onto the writing display 5.

  In the present modification, the same optical system as the optical system unit 13 can be used as an optical system composed of a dichroic mirror or the like. Further, since the light of each color sequentially illuminates the original, a cold cathode tube is not necessary, and a monochrome CCD can be used as an image sensor, so that high-resolution imaging is possible with low-cost equipment. Further, bright display is possible by using a monochrome liquid crystal light valve. Configurations, operations, and effects other than those described above in the present modification are the same as those in the first embodiment described above. Note that when imaging a document, all of the transmissive liquid crystal light valves 82R, 82G, and 82B may be in a transmissive state, and the document may be illuminated with white light and imaged with a color CCD. Alternatively, the original may be illuminated with a cold cathode tube and imaged with a color CCD.

  Next, an eighth modification of the first embodiment, that is, No. 1 shown in Table 1 was used. 2 (transmission type color filter system) will be described. FIG. 16 is a diagram showing a projection display device with an imaging device according to this modification. The configuration of this modification is the same as that of the first embodiment described above, but in this modification, a small projection device will be described in more detail. As shown in FIG. 16, in the display device according to this modification, a light source 26 c is provided as a white light source in the small projection device 26. A transmissive liquid crystal light valve 26b is provided so as to be interposed in the optical path of the light emitted from the light source 26c. The transmissive liquid crystal light valve 26b includes a color filter, and each pixel is composed of RGB sub-pixels. Further, a lens 26 a is provided between the transmissive liquid crystal light valve 26 b and the writing display 5. On the other hand, in the imaging device 7, a color CCD is provided as the imaging element 7b.

  Next, the operation of this modification, that is, the projection display method according to this modification will be described. When the document is imaged, the cold cathode tube 8 or the light source 26c is turned on to illuminate the document. Then, the color CCD images the original. At the time of image projection, the light source 26c emits white light, and the white light is transmitted through the transmissive liquid crystal light valve 26b, so that a color image is added, and the light is expanded by the lens 26a. Projected against.

  In the present modification, the small projection device 26 is composed of one light source 26c, a transmissive liquid crystal light valve 26b, and a lens 26a. Therefore, the small projection device 26 can be extremely miniaturized. A monochrome CCD may be provided as the image sensor 7b. In this case, the transmissive liquid crystal light valve 26b sequentially transmits the sub-pixels of each color so that the original is sequentially illuminated with the light of each color, and the original is imaged by the monochrome CCD in synchronism with this. What is necessary is just to synthesize | combine the image of minutes.

  Next, a ninth modification of the first embodiment, that is, No. 1 shown in Table 1 was used. 3 (transmission type color sequential method) will be described. FIG. 17 is a diagram showing a projection display device with an imaging device according to this modification. As shown in FIG. 17, in the display device according to this modification, the small projection device is provided with an LED 88 that emits light of RGB colors by switching in a short time as a light source, and the optical path of the light emitted from the LED 88 A monochrome transmissive liquid crystal light valve 89 is provided so as to be interposed between the two. Further, a lens 84 is provided between the transmissive liquid crystal light valve 89 and the writing display 5. On the other hand, in the imaging device 7, a monochrome CCD is provided as the imaging element 7b.

  Next, the operation of this modification, that is, the projection display method according to this modification will be described. When the document is imaged, the LED 88 illuminates the document by sequentially switching and emitting light of each color. In synchronism with this, the monochrome CCD sequentially captures the image of the original, and then combines the images for the three colors to form a full-color image. Further, at the time of image projection, the LED 88 sequentially emits light of each color, and in synchronization with this, a monochrome transmissive liquid crystal light valve 89 forms an image for each color. Thereby, the image of each color is projected on the writing display 5 sequentially. Then, by sufficiently shortening the color switching cycle, the user can recognize a full-color image.

  In this modification, the LED 88 emits light of each color sequentially to illuminate the original when the original is imaged, so that a cold-cathode tube is not required and a monochrome CCD can be used as the image pickup element. The equipment enables high-resolution imaging. In addition, since the small projection device can be configured by one light source, a transmissive liquid crystal light valve, and a lens, the small projection device can be extremely miniaturized. That is, a resolution equivalent to that of the above-described sixth modification can be obtained by a small projection device having a size equivalent to that of the above-described eighth modification. Further, bright display is possible by using a monochrome liquid crystal light valve. Configurations, operations, and effects other than those described above in the present modification are the same as those in the first embodiment described above. The original may be illuminated with a cold cathode tube and imaged with a color CCD.

  Next, a tenth modification of the first embodiment, that is, No. 1 shown in Table 1. 4 (reflective type 3 plate type) will be described. FIG. 18 is a diagram showing a projection display device with an imaging device according to this modification. As shown in FIG. 18, in the display device according to this modification, surface light sources 81 </ b> R, 81 </ b> G, and 81 </ b> B of RGB colors are provided as light sources in the small projection device. Each of the surface light sources 81R, 81G, and 81B includes an LED and a light guide plate, and emits red, green, and blue light in a planar shape. Further, PBSs (Polarization Beam Splitters) 90R, 90G, and 90B are provided so as to be interposed in the optical paths of light emitted from the surface light sources 81R, 81G, and 81B, respectively, and emitted from the surface light sources. Reflective liquid crystal light valves 91R, 91G, and 91B that form images for the respective colors are provided at positions where light enters through the PBS. The reflective liquid crystal light valves 91R, 91G, and 91B are monochrome liquid crystal light valves. Further, a prism 83 is provided at a position where light reflected by the reflective liquid crystal light valves 91R, 91G, and 91B and passed through the PBSs 90R, 90G, and 90B intersects, and a lens is provided between the prism 83 and the writing display 5. 84 is provided. That is, PBSs 90R, 90G, and 90B are disposed around the prism 83, and the lens 84 is disposed at a position where light incident on the prism 83 from these PBSs is emitted. On the other hand, in the imaging device 7, a monochrome CCD is provided as the imaging element 7b.

  Next, the operation of this modification, that is, the projection display method according to this modification will be described. When imaging a document, the surface light sources 81R, 81G, and 81B are sequentially turned on to emit light of each color sequentially. These lights enter the PBSs 90R, 90G, and 90B, are reflected in the PBSs 90R, 90G, and 90B, and are applied to the reflective liquid crystal light valves 91R, 91G, and 91B, respectively. Then, the light is totally reflected by the reflective liquid crystal light valves 91R, 91G, and 91B, passes through the PBSs 90R, 90G, and 90B, passes through the prism 93 and the lens 94, and illuminates the original. In synchronism with this, the monochrome CCD sequentially captures the image of the original, and then combines the images for the three colors, thereby recognizing a full-color image. At the time of image projection, the surface light sources 81R, 81G, 81B emit light of each color, and these lights are incident on the PBSs 90R, 90G, 90B, respectively, and are reflected in the PBSs 90R, 90G, 90B, respectively, and are reflective types. The liquid crystal light valves 91R, 91G, and 91B are irradiated. Then, these lights are selectively reflected by the reflective liquid crystal light valves 91R, 91G, and 91B to add images of the respective colors, pass through the PBSs 90R, 90G, and 90B, are combined by the prism 93, and pass through the lens 94. It is projected on the writing display 5.

  This modification has an advantage that the aperture ratio is high and the display is bright because the reflective liquid crystal light valve is used instead of the transmissive liquid crystal light valve, as compared with the sixth modification. On the other hand, the above-described sixth modified example has an advantage that the optical system is simplified and the cost can be reduced and the size can be reduced because the PBS is unnecessary, compared with the present modified example. . In addition, since the small projection apparatus of the present modification is a three-plate type, a bright and high-definition display is possible as compared with a single-plate type apparatus. On the other hand, the single plate type device has an advantage that the cost is low and the size is small compared to the three plate type device. Configurations, operations, and effects other than those described above in the present modification are the same as those in the sixth modification of the first embodiment described above. It should be noted that when imaging a document, the document may be illuminated by a cold cathode tube and imaged by a color CCD.

  Next, an eleventh modification of the first embodiment will be described. This modified example is No. 1 shown in Table 1. 4 (reflection type 3 plate type) is an example in which a white light source is used as a light source. FIG. 19 is a diagram showing a projection display device with an imaging device according to this modification. As shown in FIG. 19, in the display device according to this modification, in place of the surface light sources 81R, 81G, and 81B, a white light source 85, other than blue light and blue light, as compared with the tenth modification described above. The difference is that a dichroic mirror 86B that separates the light from the light, a dichroic mirror 86G that reflects the green light and transmits the other, and mirrors 87d and 87e that totally reflect the light are provided. Specifically, in the small projection device, a dichroic mirror 86B is disposed on the optical path of the light emitted from the white light source 85, and the mirror 87d reflects the blue light separated by the dichroic mirror 86B toward the PBS 90B. Is arranged. In addition, a mirror 87e is disposed on the optical path of light other than blue light separated by the dichroic mirror 86B, and a dichroic mirror 86G is disposed on the optical path of light reflected by the mirror 87e. The green light reflected by the dichroic mirror 86G enters the PBS 90G, and the light (red light) transmitted through the dichroic mirror 86G enters the PBS 90R. The configuration other than the above in the present modification is the same as that in the tenth modification described above.

  Next, the operation of this modification, that is, the projection display method according to this modification will be described. The white light source 85 emits white light, and this light enters the dichroic mirror 86B. Thereby, white light is separated into blue light and other light, and the blue light is reflected by the mirror 87d and enters the PBS 90B. Light other than blue light is reflected by the mirror 87e and enters the dichroic mirror 86G. Of this light, green light is reflected by the dichroic mirror 86G and enters the PBS 90G. The light (red light) transmitted through the dichroic mirror 86G enters the PBS 90R.

  At the time of image projection, the light of each color is selectively reflected by the reflective liquid crystal light valves 91R, 91G, and 91B to add the image of each color, and the polarization direction is inverted by the PBS 90R, 90G, and 90B. The light beams of the respective colors are combined in the prism 83, spread by the lens 84, and projected onto the writing display 5. Operations other than those described above in the present modification are the same as those in the tenth modification described above.

  Next, a twelfth modification of the first embodiment, that is, No. 1 shown in Table 1. 5 (reflective color filter system) will be described. FIG. 20 is a diagram showing a projection display device with an imaging device according to this modification. As shown in FIG. 20, in this modification, as compared with the above-described eighth modification (see FIG. 16), a reflective liquid crystal including a PBS 92 and a color filter instead of the transmissive liquid crystal light valve 26b. The difference is that a light valve 93 is provided. That is, the PBS 92 is arranged so that the light emitted from the white light source 26c is incident on the reflective liquid crystal light valve 93 and the light reflected by the reflective liquid crystal light valve 93 is emitted toward the lens 26a. . On the other hand, in the imaging device 7, a color CCD is provided as the imaging element 7b.

  Next, the operation of this modification, that is, the projection display method according to this modification will be described. When the document is imaged, the cold cathode tube 8 or the light source 26c is turned on to illuminate the document. Then, the color CCD images the original. At the time of image projection, the light source 26c emits white light, and this white light enters the reflective liquid crystal light valve 92 through the PBS 92 and is reflected by the reflective liquid crystal light valve 93 to add a color image. Then, after passing through the PBS 92 and reversing the polarization direction, the light is expanded by the lens 26 a and projected onto the writing display 5.

  In this modification, since the small projection device 26 is configured by one light source 26c, a reflective liquid crystal light valve 93, a PBS 92, and a lens 26a, compared with the tenth and eleventh modifications described above, A small projection device can be made compact. Further, since the reflective liquid crystal light valve is used, the display image can be brightened as compared with the above-described eighth modification using the transmissive liquid crystal light valve. A monochrome CCD may be provided as the image sensor 7b. In this case, the reflective liquid crystal light valve 93 sequentially reflects the sub-pixels of each color to sequentially illuminate the original with light of each color, and in synchronization with this, the original is imaged by the monochrome CCD, and then the three colors What is necessary is just to synthesize | combine the image of minutes.

  Next, a thirteenth modification of the first embodiment, that is, No. 1 shown in Table 1 was obtained. 6 (reflection type color sequential method) will be described. FIG. 21 is a diagram showing a projection display device with an imaging device according to this modification. As shown in FIG. 21, in the display device according to the present modification, the small projection device is provided with an LED 88 that emits light of RGB colors by switching in a short time as a light source, and the optical path of the light emitted from the LED 88 A reflective liquid crystal light valve 93 including a PBS 92 and a color filter is provided so as to be interposed between the two. Further, a lens 84 is provided between the PBS 92 and the writing display 5. On the other hand, in the imaging device 7, a monochrome CCD is provided as the imaging element 7b.

  Next, the operation of this modification, that is, the projection display method according to this modification will be described. When the document is imaged, the LED 88 illuminates the document by sequentially switching and emitting light of each color. In synchronism with this, the monochrome CCD sequentially captures the image of the original, and then combines the images for the three colors to form a full-color image. At the time of image projection, the LED 88 sequentially emits light of each color, and in synchronization with this, the monochrome reflective liquid crystal light valve 93 forms an image for each color. As a result, the light emitted from the LED 88 enters the reflective liquid crystal light valve 93 via the PBS 92 and is selectively reflected by the reflective liquid crystal light valve 93 to add an image, via the PBS 92 and the lens 84. Thus, an image is projected onto the writing display 5. Then, by sequentially switching and projecting each color image, the user can recognize a full color image.

  Next, the 14th modification of 1st Embodiment, ie, No. shown in Table 1, is shown. 7 (DMD system) will be described. FIG. 22 is a diagram showing a projection display device with an imaging device according to this modification. As shown in FIG. 22, in the display device according to this modification, a white light source 94 is provided in the small projection device, and the color filter wheel 95 is interposed in the optical path of the light emitted from the white light source 94. Is provided. In the color filter wheel 95, color filters 95a for each color of RGB are arranged around the rotation axis, and the color filters 95a for each color are sequentially interposed in the optical path by rotating the color filter wheel 95. It has become. Further, lenses 96a and 96b are provided before and after the color filter wheel 95 on the optical path. Further, a DMD 97 is provided behind the lens 96b on the optical path. Furthermore, a lens 84 is provided between the DMD 97 and the writing display 5. On the other hand, in the imaging device 7, a monochrome CCD is provided as the imaging element 7b.

  Next, the operation of this modification, that is, the projection display method according to this modification will be described. At the time of imaging a document, the white light source 94 emits white light, and the white light is collected by the lens 96a, passes through the color filter 95a of the color filter wheel 95, and passes through the lens 96b. Thereby, white light is colored in any one of RGB colors. Then, the colored light enters the DMD 97, is totally reflected by the DMD 97, is expanded by the lens 84, and illuminates a document (not shown) placed on the writing display 5. At this time, the monochrome CCD (imaging device 7b) of the imaging device 7 captures an image. Then, by rotating the color filter wheel 95, the color filters 95a of the respective colors are sequentially interposed in the optical path, and the light emitted from the white light source 94 is sequentially colored in the respective colors. In synchronism with this, the monochrome CCD sequentially captures the images of each color, and then combines the images for the three colors to form a full-color image.

  Further, at the time of image projection, the white light source 94 emits white light, and the white light is transmitted through the lens 96a, the color filter wheel 95, and the lens 96b, thereby being colored in any one of RGB colors. Light enters the DMD 97. Then, the light is reflected by the DMD 97 to add an image of each color, and is enlarged by the lens 84 and projected onto the writing display 5. Then, by rotating the color filter wheel 95, the color filters 95a of the respective colors are sequentially interposed in the optical path, and the light emitted from the white light source 94 is sequentially colored to each color, and the DMD 97 forms an image of each color in synchronization with this. As a result, RGB three-color images are mixed. As a result, the user can recognize a full-color image.

  In this modification, by using a DMD as the image forming apparatus, the apparatus can be downsized as compared with the above-described three-plate type small projection apparatus. In addition, it is possible to project a higher definition image than the above-described single-plate type small projection device. It should be noted that when imaging a document, the document may be illuminated by a cold cathode tube and imaged by a color CCD.

  Regarding the sixth to fourteenth modified examples of the first embodiment described above, the advantages and disadvantages of the modified examples are summarized as follows. When the transmissive liquid crystal light valve is used as the image forming apparatus as shown in the sixth to ninth modifications, the reflective liquid crystal light valve is used as shown in the tenth to base 13 modifications. Compared with the case where it is used, a PBS (polarization beam splitter) is not required, so that the cost and size of the optical system can be reduced. On the other hand, when a reflective liquid crystal light valve is used as the image forming apparatus, the aperture ratio is higher and the display is brighter than when a transmissive liquid crystal light valve is used.

  Further, as shown in the sixth, seventh, tenth, and eleventh modifications, the three-plate type using three panels is shown in the eighth, ninth, twelfth, and thirteenth modifications. Compared with a single-plate type using a single panel, sufficient image brightness can be secured, and high-definition display is possible. On the other hand, since the optical system of the small projection apparatus is simplified compared to the three-plate type, the single plate type can be reduced in cost and size. However, in the single plate type, the color filter method absorbs light by the color filter, and in the color sequential method, since the light source is turned on in a time-sharing manner, the image becomes darker than the three-plate type that is fully lit. Further, when a DMD (digital micromirror device) is used as the image forming apparatus as shown in the fourteenth modification described above, the small projection apparatus can be downsized as compared with the three-plate type.

  Next, a second embodiment of the present invention will be described. FIG. 23A is a diagram illustrating an operation in which the projection display device with an imaging device according to the present embodiment images a document, and FIG. 23B is an operation in which the captured image is projected and the image is written. FIG. As shown in FIG. 1A, in the above-described first embodiment, an example in which the imaging device 7 and the small projection device 26 are provided separately is shown, but as shown in FIG. In addition, in the second embodiment, instead of the imaging device and the small projection device, an imaging projection device 65 is provided as an internal projection device having the functions of both devices. In the imaging projection device 65, a lens 65a is provided at a position facing the writing display 5, a beam splitter 65b is provided below the lens 65a, and an imaging element 65c is provided below the beam splitter 65b. Is provided. Thereby, the light incident on the beam splitter 65b from the document 21 via the lens 65a is transmitted through the beam splitter 65b and incident on the image sensor 65c. A liquid crystal light valve 65d is provided on the side of the beam splitter 65b, and a light source 65e is provided at a position sandwiching the liquid crystal light valve 65d together with the beam splitter 65b. Thereby, the light emitted from the light source 65e is transmitted through the liquid crystal light valve 65d, enters the beam splitter 65b, is reflected by the beam splitter 65b, and is projected onto the liquid crystal panel 27 through the lens 65a. . The configuration other than the above in this embodiment is the same as that in the first embodiment.

  Next, the operation of the present embodiment configured as described above, that is, the projection display method according to the present embodiment will be described. As shown in FIG. 23A, when the document is imaged, the liquid crystal panel 27 is in the transmission mode, and the cold cathode tube 8 illuminates the document 21. The light reflected by the document 21 passes through the input tablet 28 and the liquid crystal panel 27, enters the lens 65a of the imaging projection device 65, passes through the lens 65a, and then passes through the beep splitter 65b to pass through the imaging element 65c. Is incident on. As a result, the image sensor 65 c images the document 21.

  Further, as shown in FIG. 23B, when the captured image is projected and written, an image captured by the liquid crystal light valve 65d is formed. The liquid crystal panel 27 is in a scattering mode. In this state, the light source 65e emits light, and the light is transmitted through the liquid crystal light valve 65d and an image is added. Then, the light is reflected by the beam splitter 65b and projected onto the liquid crystal panel 27 through the lens 65a. Operations other than those described above in the present embodiment are the same as those in the first embodiment.

  In this embodiment, as compared with the first embodiment described above, the imaging device and the small projection device are combined into one imaging projection device 65, so that the lens can also be used during imaging and projection. Thus, the display device can be reduced in size and cost. Effects other than those described above in the present embodiment are the same as those in the first embodiment described above.

  In the present embodiment as well, various input devices can be used as the input device for writing, as in the first to fourth modifications of the first embodiment described above.

  Next, a third embodiment of the present invention will be described. FIG. 24 is an optical model diagram showing a projection device in the projection display device with an imaging device according to the present embodiment. As shown in FIG. 1B, in the above-described first embodiment, in addition to the projection device 20 that projects the captured image onto the screen, a small projection device 26 that projects the same image onto the liquid crystal panel 27 is provided. It has been. On the other hand, in the third embodiment, as shown in FIG. 24, a beam splitter 66 is provided between the optical system unit 13 and the projection lens unit 14 of the projection apparatus 20, and an external screen is provided. A part of the light projected onto the liquid crystal panel 27 is projected onto the liquid crystal panel 27 (see FIG. 1B). That is, a part of the light emitted from the prism 19 of the optical system unit 13 is reflected by the beam splitter 66 and projected onto the liquid crystal panel 27, and the remaining part of the light passes through the beam splitter 66 and enters the projection lens unit 14. And projected on the screen. Note that a beam splitter 66 having a relatively low reflectance is used, so that most of the light incident on the beam splitter 66 is incident on the projection lens unit 14 and only a small part is directed toward the liquid crystal panel 27. ing. The imaging device 7 and the beam splitter 66 constitute an internal projection device. The configuration other than the above in this embodiment is the same as that in the first embodiment.

  Next, the operation of the present embodiment configured as described above, that is, the projection display method according to the present embodiment will be described. As shown in FIG. 24, when projecting and writing a captured image, the light emitted from the lamp unit 12 is emitted from the prism 19 to the beam splitter 66 via the optical system unit 13. Then, a part of the light is reflected by the beam splitter 66 and projected onto the liquid crystal panel 27 (see FIG. 1B) in the scattering mode to display an image on the liquid crystal panel 27. Further, the remainder of the light incident on the beam splitter 66 passes through the beam splitter 66 and enters the projection lens unit 14. Then, this light is projected onto an external screen by the projection lens unit 14, and an image is displayed on this screen. Operations other than those described above in the present embodiment are the same as those in the first embodiment.

  In the present embodiment, as compared with the first embodiment described above, a small projection device can be omitted, so that the display device can be reduced in size and cost. Effects other than those described above in the present embodiment are the same as those in the first embodiment described above.

  In the present embodiment as well, various input devices can be used as the input device for writing, as in the first to fourth modifications of the first embodiment described above.

  Next, a fourth embodiment of the present invention will be described. FIG. 25A is a diagram illustrating an operation in which the projection display device with an imaging device according to the present embodiment captures an image of a document, and FIG. 25B is an operation in which the captured image is projected and written on the image. FIG. 26 is a cross-sectional view showing the imaging surface cover of the display device. As shown in FIGS. 1A and 1B, in the first embodiment described above, the writing display 5 is fitted into the opening 4a of the frame 4, and the writing display 5 has a liquid crystal. A panel 27 and an input tablet 28 are provided. An imaging surface cover 9 is rotatably attached to the frame 4.

  In contrast, in the present embodiment, as shown in FIG. 25A, a transparent plate 67 such as a glass plate is fitted in the opening of the frame, and an imaging surface cover 68 is attached to the frame. ing. One end of the imaging surface cover 68 is pivotally connected to one end of the frame, functions as a door that can be opened and closed with respect to the transparent plate 67, and can switch whether the transparent plate 67 is exposed or covered.

  As shown in FIG. 26, in the imaging surface cover 68, an antireflection film 70 is laminated on a screen 69, and an input tablet 71 is laminated thereon. When the imaging surface cover 68 is closed, the screen 69 is positioned on the lower side, that is, the transparent plate 67 side, and the input tablet 71 is positioned on the upper side. The screen 69 is a screen that displays an image projected by scattering light incident from the back side, that is, the surface facing the transparent plate 67. For example, the screen 69 is a screen for a rear projector. It is Blue Ocean (trade name). In the screen 69, particles 73 are dispersed in a base material 72 made of carbon black, and light 74 incident from the back surface is scattered and emitted from the surface. The input tablet 71 is, for example, the same resistive film type input tablet as the input tablet 28 in the first embodiment described above. The configuration other than the above in this embodiment is the same as that in the first embodiment.

  Next, the operation of the present embodiment configured as described above, that is, the projection display method according to the present embodiment will be described. As shown in FIG. 25A, when the document is imaged, the document 21 is placed on the transparent plate 67. When the document 21 is thin, the imaging surface cover 68 is closed, and the transparent plate 67, the imaging surface cover 68, Thus, the document 21 is sandwiched and the document 21 is supported. In this state, the cold cathode tube 8 illuminates the document 21. Then, the light reflected by the document 21 passes through the transparent plate 67 and enters the imaging device 7. Thereby, the document 21 is imaged.

  Further, as shown in FIG. 25B, when projecting and writing a captured image, the document 21 is removed from the transparent plate 67 and the imaging surface cover 68 is closed. Further, the captured image is formed on the liquid crystal light valve 26b of the small projection device 26. In this state, the light source 26c of the small projection device 26 emits light, and the light is transmitted through the liquid crystal light valve 26b to add an image. Thereafter, the light is expanded by the lens 26a and is transmitted through the transparent plate 67. It is projected on the screen 69. As a result, the image for writing is displayed on the screen 69. Then, the user inputs the writing information to the input tablet 71 so as to overwrite the image while viewing the image for writing displayed on the screen 69. Information input to the input tablet 71 is superimposed on the captured image and projected onto the screen 69 by the small projector 26 and projected onto the external screen by the projector 20. Operations other than those described above in the present embodiment are the same as those in the first embodiment.

  In this embodiment, the liquid crystal panel 27 (see FIG. 1) can be omitted as compared with the first embodiment described above, so that the cost of the display device can be reduced. Effects other than those described above in the present embodiment are the same as those in the first embodiment described above.

  In the present embodiment as well, various input devices can be used as the input device for writing, as in the first to fourth modifications of the first embodiment described above. In the present embodiment, the lower unit in the second or third embodiment may be used as the lower unit.

  In each of the above-described embodiments, the imaging apparatus 7 that captures a planar image at a time is used as an apparatus that captures a document. However, the present invention is not limited to this. For example, the reading line is unidirectional. A scanner that scans and captures a planar image may be used.

  Further, in each of the above-described embodiments, the projection device provided with the transmissive liquid crystal light valve is used as the projection device to the outside. However, the present invention is not limited to this, for example, provided with the reflective liquid crystal light valve. A projection apparatus may be used and a projection apparatus provided with DMD may be used.

  Furthermore, in each of the above-described embodiments, the projection display device with an imaging device provided with the imaging device has been described. However, the imaging device may be omitted, and an image may be input from the outside as electronic information. Accordingly, although it is necessary to create electronic information in advance, the imaging device can be omitted, and thus the display device can be reduced in size and cost. In this case as well, editing operations such as writing on the projected image can be performed in real time on the display device.

  The present invention can be applied to a display device and a display method for adding writing information to a document and displaying the captured document and writing information.

(A) is a perspective view which shows the projection display apparatus with an imaging device which concerns on the 1st Embodiment of this invention, (b) is sectional drawing which shows the upper unit of this projection display apparatus with an imaging device. (A) is sectional drawing which shows the display for writing of this projection display apparatus with an imaging device, (b) is sectional drawing which shows the liquid crystal panel. (A) And (b) is a perspective view which shows the preparation methods of the liquid crystal panel of this writing display in order of the process. (A) And (b) is sectional drawing which shows operation | movement of the liquid crystal panel of this writing display. It is sectional drawing which shows the touchscreen of this writing display. It is an optical model figure which shows the external projection apparatus of this projection display apparatus with an imaging device. It is a block diagram which shows the flow of the image information in the projection display apparatus with an imaging device which concerns on this embodiment. (A) is a figure which shows the operation | movement which images the original in this projection display apparatus with an imaging device, (b) is a figure which shows the operation | movement which projects the imaged image and writes with respect to this image. It is a perspective view which shows the upper unit of the display apparatus which concerns on the 1st modification of 1st Embodiment. It is a figure which shows the upper unit of the display apparatus which concerns on the 2nd modification of 1st Embodiment. It is a perspective view which shows the upper unit of the display apparatus which concerns on the 3rd modification of 1st Embodiment. It is sectional drawing which shows the upper unit of the display apparatus which concerns on the 4th modification of 1st Embodiment. It is a figure which shows the projection display apparatus with an imaging device which concerns on the 5th modification of 1st Embodiment. It is a figure which shows the projection display apparatus with an imaging device which concerns on the 6th modification of this 1st Embodiment. It is a figure which shows the projection display apparatus with an imaging device which concerns on the 7th modification of this 1st Embodiment. It is a figure which shows the projection display apparatus with an imaging device which concerns on the 8th modification of this 1st Embodiment. It is a figure which shows the projection display apparatus with an imaging device which concerns on the 9th modification of this 1st Embodiment. It is a figure which shows the projection display apparatus with an imaging device which concerns on the 10th modification of this 1st Embodiment. It is a figure which shows the projection display apparatus with an imaging device which concerns on the 11th modification of this 1st Embodiment. It is a figure which shows the projection display apparatus with an imaging device which concerns on the 12th modification of this 1st Embodiment. It is a figure which shows the projection display apparatus with an imaging device which concerns on the 13th modification of this 1st Embodiment. It is a figure which shows the projection display apparatus with an imaging device which concerns on the 14th modification of this 1st Embodiment. (A) is a figure which shows the operation | movement which the projection display apparatus with an imaging device which concerns on the 2nd Embodiment of this invention images a document, (b) projects the imaged image and writes with respect to this image It is a figure which shows the operation | movement which performs. It is an optical model figure which shows the projection apparatus of the projection display apparatus with an imaging device which concerns on the 3rd Embodiment of this invention. (A) is a figure which shows the operation | movement which the projection display apparatus with an imaging device which concerns on the 4th Embodiment of this invention images a document, (b) projects the imaged image and writes with respect to this image It is a figure which shows the operation | movement which performs. It is sectional drawing which shows the imaging surface cover of this display apparatus. It is a perspective view which shows the conventional projection display apparatus with an imaging device described in patent document 1 and nonpatent literature 1. It is a perspective view which shows the lower unit of this projection display apparatus with an imaging device. It is a figure which shows operation | movement of this projection display apparatus with an imaging device. It is a block diagram which shows the flow of the image information in this projection display apparatus with an imaging device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Projection display apparatus with an imaging device 2; Upper unit 3; Lower unit 4; Frame 4a; Opening part 5; Display 6a for writing 6; Side plate 6b: Bottom plate 7: Imaging device 7a; Lens 7b; Tube 9; Imaging surface cover 10; Housing 11; Power supply unit 12; Lamp unit 13; Optical system unit 14; Projection lens unit 15; Drive circuit 16R, 16G; Dichroic mirrors 17a, 17b, 17c: Mirrors 18a, 18b, 18c Liquid crystal light valve 19; Prism 20; Projection device 26; Small projection device 26a; Lens 26b; Liquid crystal light valve 26c; Light source 27; Liquid crystal panel 28; Input tablet 29; Glass plate 30; Transparent electrode 31; Molecular dispersion type liquid crystal 33; polymer resin 34; liquid crystal droplet 35 Light 36; Glass substrate 37; Transparent electrode 38; Spacer 39; Transparent film 40; Transparent electrode 41; Pen 52; Light-emitting element 53; Light-receiving element 54; Infrared 55; Pen 56; Infrared 57; Input pen 58; Detector 60; Input pen 61; Coil 62; Magnetic field 63; Tablet 64; Magnetic field 65; Imaging projection device 65a; Lens 65b; Beam splitter 65c: Imaging element 65d; Liquid crystal light valve 65e; Light source 66; Image pickup surface cover 69; screen 70; antireflection film 71; input tablet 72; base material 73; particle 74; light 75; input pen 81R, 81G, 81B; surface light source 82R, 82G, 82B; Bulb 83; Prism 84; Lens 85; White Light source 86R, 86G, 86B; dichroic mirror 87a, 87b, 87c, 87d, 87e; mirror 88; LED
89; monochrome transmission type liquid crystal light valve 90R, 90G, 90B; PBS
91R, 91G, 91B; reflective liquid crystal light valve 92; PBS
93; reflective liquid crystal light valve 94; white light source 95; color filter wheel 95a; color filters 96a and 96b; lens 97;
101; Projection display device with imaging device 102; Upper unit 103; Lower unit 105; Glass plate

Claims (9)

In a projection display device that projects and displays an image to the outside, a writing display for displaying an image and inputting writing information for the image, and writing information input by the writing display are input. An external projection device that projects the image and the writing information to the outside, and an internal projection device that projects and displays the image and the writing information on the writing display. The projection device captures a document before projecting the image to obtain the image, the writing display supports the document when capturing the document, and the writing display A transparent plate fixed to the internal projection device, and an imaging surface cover capable of switching whether to expose or cover the transparent plate, the imaging surface cover comprising the internal projection device There projection display device characterized by having a screen for displaying the image and the writing information during projection, the input tablet in which the write information overlaid on the screen is input. The internal projection device projects an image pickup device that picks up the original, a lens provided at a position facing the writing display, and light to which the image and the writing information are added via the lens. The projection display device according to claim 1 , further comprising a projection device including a projection element. The internal projection device emits a light provided with a lens provided at a position facing the writing display, an image pickup device for picking up an image of the original through the lens, and the image and the writing information. And a beam splitter that emits light incident through the lens toward the imaging element and emits light emitted from the projection element toward the lens. The projection display device according to claim 1 . The projection display apparatus according to claim 2 , wherein the projection element includes a transmissive light valve and a light source that emits light to the transmissive light valve. The projection element includes a reflective light valve, a light source that emits light, and guides the light emitted from the light source to the reflective light valve and reflects the light reflected by the reflective light valve to the writing display. The projection display device according to claim 2 , further comprising a beam splitter that guides the light so that the light is projected onto the projection display. Projection according the projection device comprises a digital micromirror device for forming an image, to claim 2 or 3, characterized in that it has a light source for emitting light toward the digital micromirror device Display device. The light source, a projection display device according to any one of claims 4 to 6, characterized in that for illuminating the document during image capture of the document. The external projection device projects a lamp unit, an optical system unit for adding the image and the writing information to the light emitted from the lamp unit, and the light with the image and the writing information added to the outside. A projection lens unit, and the internal projection device is interposed in an optical path between the imaging device that images the document and the optical system unit and the projection lens unit, and the image and the writing information are added. A beam splitter that emits part of the emitted light toward the projection lens unit and emits the remaining part in the other direction, and the light emitted in the other direction is the writing The projection display device according to claim 1 , wherein the projection display device is projected on a display for use. In a projection display method for projecting and displaying an image, an imaging process for capturing an image by capturing an original and inputting the writing information to the writing display while projecting the image onto the writing display A writing information input step; and an external projection step of projecting the image and the writing information to the outside of the projection display device, wherein the writing display exposes the transparent plate and the transparent plate. An imaging surface cover that can be switched between covering and covering, a screen on which the imaging surface cover projects the image and the writing information, and an input tablet that is overlaid on the screen and that receives the writing information The imaging step is a step in which the transparent plate is exposed, the transparent plate supports the original, and the original is imaged through the transparent plate, and the writing information Power step, projection display method wherein the image on the screen the image pickup surface cover covers said transparent plate is a step of the write data to the input tablet is projected is input.

Images