JPH0519939A - Coordinate input device - Google Patents

Abstract

(57) [Summary] [Object] To provide a coordinate input device capable of performing an input operation from a distance only by a light beam generator without the operator coming to the coordinate detector side in coordinate input. A light beam generator 19, a screen 11 with a built-in coordinate detector capable of projecting an image, and outputting coordinate information of coordinates of a light beam projected from the light beam generator 19, and a built-in coordinate detector. A memory 20 for inputting the output of the screen 11 is provided. On the screen 11, light or heat detection sensors are two-dimensionally arranged in a mesh. The voltage from the detection sensor enters the memory 20 after being binarized. This makes it possible to input coordinates from a distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate input device using a projection type screen.

[0002]

2. Description of the Related Art In recent years, it has become popular to project the screen of a personal computer on a projection screen to give a presentation to an audience.

A conventional coordinate input device will be described below with reference to FIG. 12 is a projector, 13 is a CRT, 14
Is an image memory, 15 is a CRTC, 16 is an MPU, 17 is a bus, 18 is a keyboard, 20 is a memory, 21 is a screen, and 22 is a coordinate input device. The usage of this device will be described below. As the coordinate input device 22, there is an absolute position input device such as a tablet or a digitizer. These include, for example, a pen-shaped coordinate indicator and a pressure-sensitive coordinate detector. A signal that has entered the bus 17 from the coordinate input device 22 enters the memory 20 under the control of the MPU 16, which is a microprocessor. On the other hand, the image control signal enters the CRTC 15 which is the CRT controller from the MPU 16, the image signal stored in the image memory 14 is visualized by the CRT 13 and enters the projector 12. Here, the amount of light is amplified, enlarged by a lens, and projected on the screen 21. The input signal from the coordinate input device 22 is displayed as, for example, a cursor.

[0004]

However, in the above-mentioned conventional configuration, since it is necessary to bring the coordinate indicator of the coordinate input device into contact with the coordinate detector, when a person other than the presenter moves the cursor in a lecture or the like. Had to be troublesome because it had to walk to the side of the coordinate detector for operation.

The present invention solves the above-mentioned conventional problems. The operator does not come to the side of the coordinate detector of the coordinate input device to perform coordinate input operation from a distance using only the light beam generator. You can

[0006]

In order to achieve this object, a coordinate input device of the present invention comprises a screen with a built-in coordinate detector in which light or heat detection sensors are two-dimensionally arranged in a mesh.
And a light beam generator that generates a light beam.

[0007]

According to the present invention, when the light beam irradiates the coordinate detector built-in screen, a voltage is generated from the light or heat detector arranged on the screen, which is binarized and then stored in the memory. to go into.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a coordinate input device. 11 is a screen with a built-in coordinate detector, 12 is a projector,
13 is a CRT, 14 is an image memory, 15 is a CRTC, 1
6 is an MPU, 17 is a bus, 18 is a keyboard, and 19 is a light beam generator. The light beam generator 19 is, for example, a portable laser beam generator that generates a light beam. This light beam is applied to an arbitrary position on the screen 11 with a built-in coordinate detector. This coordinate signal is input to the bus 17 from the screen 11 with a built-in coordinate detector. In addition, this signal is sent to the CRTC 15, the image memory 14, and the CRT to confirm the coordinates.
13, screen 1 with built-in coordinate detector via projector 12
1 can be displayed as a cursor symbol.

A first embodiment of the screen 11 with a built-in coordinate detector is shown in FIG. Reference numeral 31 is a light-transmittable screen made of cloth or synthetic resin, 32 is an optical filter for transmitting only the vicinity of the frequency of light by the light beam generator 19, and 33 is coordinate detection for detecting coordinates designated by the light. It is a vessel. These are spatially superposed in this order. CRT on screen 11 with built-in coordinate detector
13. An image created on a computer is displayed via the projector 12. Here, the output light of the light beam generator 19 is assumed to be red light close to infrared light. If the projected light does not have a frequency component close to this red light, the coordinate detector 33 is irradiated with only the light beam. The coordinate detector 33 is a device in which photodiodes are two-dimensionally arranged in a mesh shape so as to detect where light is applied. Here, an embodiment of the coordinate detector 33 is shown in FIG. Four
1 is a photodiode, 42 is a switching control signal generator, 43 is a level detector, 44 is a first switch, 45 is a second switch, and 46 is a bus interface. Signals coming from the bus 17 enter via the bus interface 46 a switching control signal generator 42 which generates switching control signals for the photodiodes at each coordinate. Here, the first and second switching signals are output, and the first switch 44,
The second switch 45 is controlled. As an example, it is assumed that the first switch 44 is set to the first position and the second switch 45 is set to the Mth position. At this time, the positive voltage is the photodiode 4
Reverse biased to 1. Here, for example, it is assumed that the photodiode 41 is exposed to light. A current flows through the diode 41, and the voltage generated across the resistor enters the level detector 34 as a detection signal via the second switch 45,
Here, it is converted into a binary value, becomes a high level, and enters the bus interface 36. When there is no light, almost no current flows, and the detection signal is close to 0V and is at low level. By switching between the first switch 44 and the second switch 45, it is possible to detect whether or not all the photodiodes are exposed to light.

Next, a second embodiment of the coordinate detector built-in screen 11 is shown in FIG. Reference numeral 31 is a screen through which light can be transmitted, which is made of, for example, a white cloth, a synthetic resin, or a film made of paint, and 34 is a coordinate detector which detects coordinates indicated by the heat generated by the light beam. These are spatially superposed in this order. The screen 11 with built-in coordinate detector has a CRT 13 and a projector 12
The image created on the computer is displayed via. Here, the output light of the light beam generator 19 is assumed to be red light close to infrared light. Make sure that the projected light does not have a frequency component close to this infrared ray. The coordinate detector 34 is a device in which heat detection sensors such as thermistors are two-dimensionally arranged in a mesh shape so as to detect a place where light is applied. An embodiment of the coordinate detector 34 is shown in FIG. 51
Is a thermistor, 52 is a current source, 53 is a switch, 54 is a level detector, 55 is a switching control signal generator, and 56 is a bus interface. The signal coming from the bus 17 enters via the bus interface 56 a switching control signal generator 55 which generates a switching control signal for the thermistor at each coordinate. Here, a switching signal is output and the switch 53 is controlled. As an example, it is assumed that the switch 53 is set to the first position. At this time, the current source 52 is connected to the thermistor 51. Here, for example, the thermistor 51
Suppose only the light is shining on. Heat is generated when exposed to light with a frequency close to that of infrared rays. The resistance value of the thermistor decreases as the temperature rises. Therefore, the voltage of the detection signal decreases. In other words, the voltage level of the detection signal decreases when it is exposed to light. The detection signal enters the level detector 54, where it is converted to binary and enters the bus interface 56. When the light hits, it becomes low level, when it does not hit, it becomes high level and is output to the bus 17. By switching the switch 53, it is possible to detect whether or not all the thermistors are exposed to light.

As described above, according to this embodiment, a screen with a built-in coordinate detector is provided, which is connected to the bus of the computer, and when the light beam from the light beam generator is applied to the screen, the coordinate information is stored in the memory. Is entered. With this, without coming to the side of the coordinate detector like a tablet,
The coordinate input operation can be performed from a distance using only the light beam generator.

[0013]

As described above, the coordinate input device of the present invention is
By providing a screen with a built-in coordinate detector in which sensors for detecting light or heat are arranged in a mesh and a light beam generator, a light beam can be generated from a distance without anyone other than the person explaining the subject coming to the coordinate detector side. It is possible to perform coordinate input operation using only the device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a coordinate input device according to an embodiment of the present invention.

FIG. 2A is an exploded plan view showing a configuration example of the coordinate detector built-in screen in the same embodiment, and FIG. 2B is an exploded plan view showing another configuration example of the coordinate detector built-in screen in the same embodiment.

FIG. 3 is a block diagram showing a configuration of a coordinate detector in FIG.

FIG. 4 is a block diagram showing a configuration of a coordinate detector in FIG. 2 (B).

FIG. 5 is a block diagram showing a configuration of a conventional coordinate input device.

[Explanation of symbols]

11 Screen with built-in coordinate detector 12 Projector 13 CRT 14 image memory 15 CRTC 16 MPU 17 bus 18 keyboard 19 Light beam generator 31 screen 32 Optical filter 33,34 coordinate detector 41 Photodiode 42 Thermistor

Claims (4)

[Claims] 1. A light beam generator for generating a light beam, and a built-in coordinate detector capable of projecting an image and outputting coordinate information of coordinates of a light beam projected from the light beam generator. A coordinate input device comprising a screen and a memory for inputting the output of the screen with the built-in coordinate detector. 2. The coordinate input device according to claim 1, wherein the screen with the built-in coordinate detector has a structure in which the screen and the coordinate detector are spatially overlapped. 3. The coordinate input device according to claim 2, wherein the coordinate detector has a plurality of light detection sensors arranged two-dimensionally. 4. The coordinate input device according to claim 2, wherein the coordinate detector has a plurality of heat detection sensors arranged two-dimensionally.