JPH0980372A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device through which a lecture can be delivered while a specific position is indicated on a screen with a cursor. SOLUTION: This device is equipped with a liquid crystal projector 11 which is driven by a personal computer and the image of a liquid crystal panel 13 is projected on the screen 15 with the light from a light source 12. On the screen 15, an infrared beam from a laser pointer 19 is projected as a spot light image, which is read as an image signal by an image sensor 17 through a lens 17, and its coordinate position is detected by a coordinate detector 20 and inputted to the personal computer. And, the personal computer generates a mouse cursor image at the coordinate position of the spot light image and displays it on the screen 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display for a personal computer constructed by using, for example, a liquid crystal panel, and more particularly, a projection type display for displaying a cursor at a specific position on a screen where an image is displayed. Regarding display device.

[0002]

2. Description of the Related Art In various presentations, for example, it has been attempted to drive a liquid crystal projector with a video signal from a personal computer to enlarge and project information on a large screen. That is, an explanation screen such as a presentation is created by software on a personal computer (personal computer), and the liquid crystal projector is driven based on the signal of the explanation image to be projected and displayed on a large screen. Here, a mouse is installed by connecting to a dedicated terminal or serial port of a personal computer, and it is slid on a flat operation table such as a table, and the moving distance or direction is detected mechanically or optically It will be used as a pointing device for operating software such as Windows.

For example, a point light image from a laser pointer is projected and displayed on a screen on which an output image from a personal computer is displayed. Based on the point light image, an explainer points an arbitrary position on the screen, Used as an aid to explain to the audience. In this case, an instruction stick or direct hands may be used. In addition, an arrow-shaped mouse cursor is displayed on a part of the image displayed on the screen based on the output from the personal computer.

However, if a laser pointer, an indicator stick, or the like is used to instruct a character or figure displayed on the screen in response to an instruction from a personal computer, it is possible to send to the next screen or to an arbitrary screen. It is necessary to further operate the mouse, keyboard, etc. in order to give instructions to the personal computer such as skipping. Therefore, for example, the presenter has to carry both the pointing rod and the mouse while carrying out the operation, which makes the operation complicated.

Here, it is conceivable that a specific position on the screen may be designated by operating only the mouse, or that the pointing cursor may be moved by the mouse. This is unsuitable for those who cannot get away from and want a lecture standing by the screen like a regular speaker. In this case, it is possible to install a PC near the screen so that the PC can be operated near the screen. In such a case, it is necessary to prepare a table for the PC near the screen. May occur and it may not match the convenience of the venue.

As a mouse, there is a wireless mouse that is not directly connected to a personal computer, but this is to emit infrared rays or radio waves from a mouse at hand to a receiver connected to the personal computer. Therefore, the mouse itself can be operated by hand without requiring a flat mouse operation space such as a trackball, a joystick, and a joy pad using cross-shaped buttons for operating vertical and horizontal movements. Be devised. By using such a wireless mouse, the speaker can stand near the screen to give a lecture, and can operate the personal computer by himself, using this mouse to move the cursor on the screen Then, it becomes easy to instruct a specific location on the display screen.

However, even when such a wireless mouse is used, when the personal computer and the light receiving section are installed behind the speaker, the wireless system using infrared rays faces the screen. It cannot be operated, and the position where the speaker stands is limited. In addition, when operating this kind of wireless mouse, the operability is not good compared to a mouse that moves on a flat table, and unless you are familiar with the operation, you can move the cursor on the screen. There is a feeling of strangeness.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is a projection type display which can be operated by a lecturer without any discomfort and allows a cursor to point a specific position on a screen on the screen. It is intended to provide a device.

[0009]

A projection type display apparatus according to the present invention projects a video signal from a computer terminal on a screen by the projection type display means and designates a specific position on the screen by a position pointing means. An optical image is generated from the designated portion of the lever, and the optical image position detecting means detects the position coordinates of the optical image displayed on the screen. Then, based on the coordinate values on the screen detected by the optical image position detecting means, the coordinate converting means converts into the screen coordinate system of the computer terminal, and the coordinate values of the screen coordinate system converted by the coordinate converting means, The coordinates are input to the computer terminal so that the cursor is displayed at the position on the screen corresponding to the coordinates.

That is, a specific portion on the screen is irradiated with a pointing rod so as to emit a thin beam of light such as a laser beam, and the optical image position formed at the beam irradiation position is detected by the image pickup element. PC display screen X, Y
It is converted into coordinates, and these coordinate values are converted into a mouse signal or the like and input to a personal computer, which follows the cursor. Therefore, it is possible to realize a pointing device for a liquid crystal projector having an excellent machine interface, which can be operated just by irradiating and moving a laser pointer or the like toward the screen and can be operated in the same manner as when instructing a normal projected image. it can.

[0011]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows the structure of the
This liquid crystal projector includes a liquid crystal projector 11 driven by an output from a personal computer (not shown).
11 includes a light source 12. This light source is configured to have a reflecting mirror having a light source lamp installed at a focal position,
Emit parallel rays. The parallel rays from this light source 12
After passing through the liquid crystal panel 13, it is projected on the screen 15 via the lens 14 for projection. An image based on the image signal from the personal computer is reproduced on the liquid crystal panel 13, and this image is projected on the screen 15 as an optical image.

Between the liquid crystal panel 13 and the lens 14, a polarizing beam splitter 16 which transmits P polarized light and reflects S polarized light, which is set at 45 ° with respect to the optical path from the light source which has passed through the liquid crystal panel 13, is provided. Is set, and the light of the display image of the liquid crystal panel 13 that has passed through is set to the screen 15. Then, the optical image displayed on the screen 15 is reflected by the polarized beam splitter 16 via a lens 14 which also has an imaging function, and is focused on an image sensor 18 such as a CCD via a condenser lens 17.

A laser pointer 19 for emitting a laser beam toward the screen 15 is set, and a spot light image is formed on the screen 15 by the laser light from the laser pointer 19. Here, in the laser pointer 19, a laser beam having a wavelength of infrared light which is not visible to the eyes is emitted and imaged on the screen 15, and the spot light image on the screen 15 is a liquid crystal panel 13 Unlike a personal computer image that passed through, it is not visible to the audience. The spot light image projected by the laser pointer 19 is picked up by the image sensor 18, and the video signal thereof is input to the coordinate detector 20.

In this coordinate detector 20, the image sensor 18
The position of the spot light image on the screen 15 is detected on the basis of the video signal from the device, and this light image detection position is converted into coordinates X and Y on the screen 15 and output to a personal computer (not shown).

In the display device constructed as above,
The speaker holds the laser pointer 19 by hand and emits a laser beam toward the place where the mouse cursor should be moved. In such a situation, the projected image represented by the liquid crystal panel 13 is displayed on the screen 15, and at the same time, the spot light image from the laser pointer 19 is formed. Then, the reflected light of this spot light image is formed on the image sensor 18 via the lens 14 and the condenser lens 17.

The coordinate detector 20 detects the spot light image of the laser pointer 19 from the light image formed on the image sensor 18 by the CCD and converts it into the coordinates X and Y of the personal computer screen. Output a signal compliant with the above to a personal computer. On the personal computer side, it may be necessary to incorporate a driver for converting absolute coordinates to relative coordinates by an operating system, but the same processing as when a normal mouse is connected as application software on the personal computer side. The mouse cursor such as an arrow follows the position pointed by the laser pointer 19. Then move the mouse cursor to the laser pointer 19
By moving the mouse to the top of the specified menu button and operating the mouse button according to the specified procedure, you can operate the software freely and use it in the same way as you normally operate a mouse. .

Here, as means for detecting only the position of the laser pointer from the projected image displayed on the screen 15, for example, the image sensor 19 is a CC dedicated to infrared rays.
D is used, an optical filter for cutting wavelengths other than infrared rays is installed, and a light beam emitted by the laser pointer 19 is blinked at a specified cycle so that the flashing cycle can be identified. It is conceivable to subtract the video signal supplied to the liquid crystal panel 13 from the image pickup signal.

As means for matching the coordinates of the image sensor 18 with the coordinates of the image projected on the screen 15 from the liquid crystal panel 13, a white raster signal or a signal of a specific pattern is projected on the screen 15 and the projected pattern is projected. Performing calibration such as detecting four corners of the image from the screen or detecting a specific location on the screen 15 or performing initial setting operation manually or automatically before or during use.
The pixels of the image sensor 18 and the pixels of the CCD forming the image sensor 18 are optically aligned so that they can be used without any initial setting operation, and markers such as crosses are projected from the liquid crystal panel 13 on the four corners of the screen 15. Laser pointer 19 at the user
It is conceivable that the four points are designated and the coordinates are detected.

The laser pointer 19 is described as emitting infrared rays, but this is because it is easy to separate the visible image from the liquid crystal panel 13 on the screen 15, and other than that, the laser pointer 19 is used. If the spot light image is not directly visible to the human eye, only the mouse cursor that follows it will be visible on the screen 15, which creates a natural screen condition. In this case, it is possible to use a pointer using normal red light or the like without using infrared light.

A polarized beam splitter 16 is used to pass the light that has passed through the liquid crystal panel 13, reflects the light from the screen 15 and guides it to the image sensor 18. This is performed by a dichroic mirror or a half mirror. It is also possible to configure.

In addition to the lens 141 for projecting the image from the liquid crystal panel 13 on the screen 15 as shown in FIG. 2, an image pickup lens 142 for picking up the image projected on the screen 15 is provided. The image on the screen 15 may be formed on the image sensor 18 by the imaging lens 142. Further, as shown in FIG. 3, a video panel 13 formed by integrating a liquid crystal panel and an image sensor.
1 can also be used, and the elements constituting the image panel and the optical image position detecting means are planar elements having a uniform matrix electrode, and thin film transistors (corresponding to each pixel of the liquid crystal panel 13 are attached. Each of the TFTs) can be a sensor.

As a matter of course, the liquid crystal projector can be configured to have a structure other than the single plate type using only one liquid crystal panel 13 as shown in each example. For example, red (R), green (G), It may be configured by using three liquid crystal panels corresponding to each of the three primary colors of blue (B) light. In addition, a projector using a CRT, a projection display unit located on the back side of the screen with respect to the speaker. Further, the same can be realized in the rear projection type projector in which the optical image position detecting means is set. Further, in addition to the laser pointer 19 that emits a narrow light beam, the same can be realized by providing a light source that emits a specific wavelength, a specific blink, or the like at the tip of the pointing rod.

FIG. 4 shows a concrete example using such a liquid crystal projector 11, and an image from the liquid crystal projector 11 is projected on the screen 15, and the screen 15 is projected.
A speaker 30 standing in the vicinity of holds the laser pointer 19,
A laser spot light image 31 is projected on a predetermined position on the screen 15. The position detector set in the liquid crystal projector 11 detects the position of the spot light image 31 on the screen 15, and a signal indicating the detected position is input to the personal computer 32 as a mouse signal. The personal computer 32 creates a mouse cursor signal based on the detected mouse signal, creates a video signal in which the mouse cursor is displayed corresponding to the position of the spot light image 32, and the mouse cursor 33 is displayed on the screen 15. To be displayed.

That is, when the laser pointer 19 is moved to move the position of the spot light image 31 on the screen 15, the mouse cursor 33 also moves on the screen 15 and follows the movement of the spot light image 31. Then, the intention of the speaker 30 is expressed on the screen 15. here,
By operating the operation buttons provided on the laser pointer 19 as appropriate, the operation signals can be directly input to the personal computer, or transmitted to the personal computer by modulating the optical image on the screen, etc., and the personal computer program can be operated as appropriate. It is said that

[0025]

As described above, according to the projection type display device of the present invention, the lecturer can easily operate without any discomfort, and can give a lecture while pointing a specific position on the screen with the cursor. You can move the mouse cursor directly with the pointer or pointer,
In a presentation or the like by projecting a personal computer image using a liquid crystal project or the like, the operability is greatly improved and an excellent machine interface is provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining a projection display device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating a second embodiment of the present invention.

FIG. 3 is a configuration diagram illustrating a third embodiment of the present invention.

FIG. 4 is a diagram illustrating a situation of a presentation using the projection display device according to the present invention.

[Explanation of symbols]

11 ... Liquid crystal projector, 12 ... Light source, 13 ... Liquid crystal panel, 13
1 ... Image panel, 14, 141, 142 ... Lens, 15 ... Screen, 16 ... Polarized beam splitter, 17 ... Condenser lens,
18 ... Image sensor, 19 Laser pointer, 20 ... Coordinate detector, 30 ... Speaker, 31 ... Laser spot optical image, 32 ... PC, 33 ... Mouse cursor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiji Tsuzuki 3-3-9 Shimbashi, Minato-ku, Tokyo, Toshiba Abu E Co., Ltd. (72) Inventor Hisayuki Mihara 3-chome, Shimbashi, Minato-ku, Tokyo No. 3-9 Toshiba Abu E Co., Ltd. (72) Inventor Toshio Obayashi 1-9-2 Hararacho, Fukaya-shi, Saitama Inside Toshiba Fukaya Plant Co., Ltd.

Claims (11)

[Claims] 1. A computer terminal, projection type display means for projecting and displaying a video signal from the computer terminal on a screen, a specified position on the screen is designated, and an optical image is generated from the designated position. Position indicating means that functions to detect the position coordinates of the optical image displayed on the screen, and the coordinate value on the screen detected by the optical image position detecting means. Based on the coordinate conversion means for converting into the screen coordinate system of the computer terminal, and the coordinate value of the screen coordinate system converted by the coordinate conversion means,
Projection, characterized in that it comprises a data output means for giving to the computer terminal as coordinate input thereof, and a cursor is displayed at a position on the screen corresponding to the coordinate value obtained by the data output means. Type display device. 2. The light image position detecting means is constituted by an image pickup means for taking a light image on the screen by sharing a projection lens used in the projection display means as an image pickup lens. The projection display device according to claim 1. 3. The light image displayed on the screen by the position indicating means is composed of light having a specific wavelength different from the wavelength of the image light emitted from the projection display means, 2. The projection display device according to claim 1, wherein the image position detection means detects the optical image through an optical filter that selects only the light of the specific wavelength. 4. The optical image displayed on the screen by the position indicating means is displayed so as to blink at a predetermined cycle, and the optical image position detecting means captures an image of the image on the screen. 2. The projection display device according to claim 1, wherein only the point plane of the specific cycle is detected from the signal. 5. The projection display means emits polarized light aligned in a specific transmission axis direction, and the optical image position detection means has a polarization different from that of the emitted light of the projection display means. The projection display device according to claim 2, further comprising means for detecting 6. The projection display device according to claim 1, wherein the wavelength of the optical image showing the position displayed on the screen by the position indicating means is constituted by light other than visible light. 7. A means for obtaining a difference between a video signal supplied to the projection type display means and an image displayed on the screen, and the optical image position detecting means based on the difference obtained by this means. 2. The projection display device according to claim 1, wherein the coordinate value of the light image position on the screen is obtained. 8. The image display means of the projection type display means and the light image position detection means for detecting a specific light image on the screen are each composed of a planar element having the same matrix electrode. Item 1. The projection display device according to item 1. 9. A means for image-capturing a video signal from the projection type display means by means of an image pickup means, and correcting the coordinates so that the coordinates of the display system by the projection type display means and the coordinate system of the image pickup means coincide. Item 1. The projection display device according to item 1. 10. A full-screen projection type in which the projection type display means and the optical image position detection means are set in front of the screen for an observer and are integrally configured. 1. The projection display device according to 1. 11. A rear projection type in which the projection type display means and the optical image position detection means are set on the back side of the screen for an observer and are integrally configured. 1. The projection display device according to 1.