JPH0747011Y2 - Eyepiece display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an eyepiece display device in which an image on the display device changes depending on the position of the display device mounted in front of the eye, and more particularly, to a position detecting means for the display device. It is a thing.

[Conventional technology]

At present, a technique called artificial reality is attracting attention for creating a realistic simulation world. The purpose of this technology is to replace the input / output of a computer with a realistic one in a vast virtual space with a high degree of freedom and to operate it freely. Here, one of the major characteristics is that an image full of feeling can be obtained by adopting an eyepiece type display device as the display device. This eyepiece type display device is shown in FIG. The display unit 51 is a goggle type display device having a liquid crystal display device incorporated therein. The user is on the display
You can see the liquid crystal display by looking into 51. The acceleration sensor 54 can detect the relative position according to the movement of the user's head. The display unit 51 is a video port of the computer unit 56.
52 and communication port 53. The relative position of the acceleration sensor 54 is transferred to the computer unit 56 via the communication port 53, and an image corresponding to the position is calculated by the arithmetic processing in the computer unit 56 and displayed on the display unit via the video port 52.
The video signal can be transferred to the 51. That is, when the user turns the right, the right image can be displayed, and when the left is turned, the left image can be displayed by the user's movement.

By converting this image into a stereoscopic image, it becomes a useful system in the fields of CAD, scientific simulation, and medical treatment. In fact, NASA is studying it as a remote system. In addition, it is more useful than other display devices in that it does not take up space, so it can be applied to personal computers.

[Problems to be solved by the device]

In the conventional method, since inertia is basically used to detect the position of the user wearing the display unit of the eyepiece display device,
An error occurs depending on the speed of movement of the user's neck. Further, this method has a problem that it lacks portability because the outer size is increased and the weight is increased.

It is an object of the present invention to provide an eyepiece type display device having a position detecting means for a display section which solves the above problems.

[Means for Solving the Problems]

In order to achieve the above object, the position detecting means of the display unit of the eyepiece display device according to the present invention comprises an ultrasonic oscillator provided in the display unit, an electromagnetic wave oscillator, and a plurality of ultrasonic units provided separately from the display unit. The ultrasonic wave oscillator comprises an acoustic wave microphone, an electromagnetic wave detection circuit, a time measuring means, and a receiving device having a computing means. The electromagnetic wave receiving circuit receives a reset signal from the electromagnetic wave oscillator, and after resetting the time measuring means by this signal, the ultrasonic oscillator. Is characterized in that the propagation time of the ultrasonic wave from the to the ultrasonic microphone is measured by the time measuring means, the position is calculated by the calculating means based on the measured value, and the position is detected.

[Embodiment 1] FIG. 1 is an external view of an eyepiece display device according to the present invention.
Reference numeral 1 is a display unit, 2 is a receiving unit, and 3 is a computer unit that generates image data. Microphones A, B, and C indicated by 6A, 6B, and 6C as ultrasonic wave receivers are provided at an upper portion of the receiving unit 2 at right angles to the microphone A as a center, and further infrared rays (hereinafter abbreviated as IR) 12 A receiving diode 8 is provided. Assuming that a certain distance was run at the ultrasonic velocity, and the required time was abbreviated as the count number, which was measured by counting the clock of a certain period by the couter 26 in the receiver (Fig. 2), the microphone A of 6A The microphone B of 6B and the microphone B of 6B are separated by a count of X0, and the microphone A of 6A and the microphone C of 6C are separated by a count of Y0. The receiving unit 2 is connected to the serial port 10 of the computer unit 3 and can communicate with the computer unit 3.
The display unit 1 is provided with an IR transmitter 5 and an ultrasonic transmitter 4 as an electromagnetic wave oscillator, and the display unit is worn by the band 13 in front of the user. The IR emitted from the IR transmitter 5 of the display unit 1 reaches the IR receiving diode 8 on the receiving unit 2, and the ultrasonic wave 11 generated simultaneously with the IR from the ultrasonic oscillator 4 is delayed by the IR 12 on the receiving unit. Mike A,
Reach B and C. Display unit 1 is computer unit 3
Connected to the video port 9 of.

FIG. 2 is a block diagram showing the configuration of each of the display unit 1, the receiving unit 2, and the computer unit 3. The display unit 1 includes a liquid crystal display 22 that displays an image, a driving IC 21 that drives the liquid crystal display, an ultrasonic oscillator 23, an IR oscillator 24, and a reset switch 7. The reception unit 2 has an IR including a microphone A, B, and C (indicated by 6A, 6B, and 6C, respectively) that receives an ultrasonic wave 11 and an IR detection diode 8 that receives an IR12.
A detection circuit 25, a time measuring means, is composed of a counter 26 for counting a clock of a constant cycle, an ultrasonic wave detecting circuit 27 for detecting signals of the microphones A, B and C, and a one-chip microcomputer 28 having a calculating means. . The computer section 3 is connected to the receiving section 2 via the serial port 10 and the display section 1 via the video port 9.

FIG. 3 is a flow chart showing the position detecting operation of the eyepiece display device having the configuration of FIG. When the user turns on the reset switch in step 31, IR and ultrasonic waves are simultaneously transmitted in step 32. Step 33
Then, the IR detection circuit 25 of the receiver 2 receives the IR signal, resets the counter 26, and simultaneously starts the counting operation. At step 34, the ultrasonic detection circuit sends the count numbers of the counter 26 (ma, mb, and mc, respectively) to the one-chip microcomputer 28 at the timing when the signals of the microphones A, B, and C are received. In step 35, ma, mb, mc in the one-chip microcomputer
The orthogonal coordinates of the display unit 1 are calculated from the. Cartesian coordinates can be obtained by finding x, y, and z from the following relational expressions.

ma ² ＝ x ² ＋ y ² ＋ z ² mb ² ＝ (x−X0) ² ＋ y ² ＋ z ² mc ² ＝ x ² ＋ (y−Y0) ² ＋ z ^{2 In} step 36, the computer unit 3 requests the orthogonal coordinate data. Data is transferred. In accordance with the position of the display unit 1 thus detected, the computer unit 3 transfers the reference image or the image corresponding to the movement of the display unit 1 to the display unit 1 in accordance with steps 37 to 40. Here, the image is updated at a cycle of about 20 Hz.

It should be noted that real time position detection can be performed by repeating the steps 32 to 34 at a constant cycle (about 100 Hz) through the loop 34A shown by the dotted line.

In this embodiment, IR is used as the reset signal for the counter 26 in the receiver, but it can be easily realized by using electric signals via radio waves or connection lines. Also, contrary to the present embodiment, it can be realized by using the display unit 1 side as the receiving side and the receiving unit 2 side as the transmitting side. The position of the eyepiece display device can be measured as long as the position of the receiving microphone does not have a positional relationship that forms a right triangle as in the present embodiment, as long as it is an arbitrary different position. Further, in order to improve the measurement reliability of the position of the eyepiece type display device and to detect the posture of the display unit, it is possible to use four or more microphones or a plurality of transmitting units on the display unit. .

[Embodiment 2] If the position detecting means of the display unit according to the present invention is applied to a system for wirelessly receiving an image from a computer unit, a completely free display terminal free from a connection line can be obtained.

FIG. 4 shows the structure of such an eyepiece type display device. Components common to FIG. 1 are designated by the same numbers. The computer section 3 is provided with a video signal transmitting antenna 42, and the display section 1 is provided with a liquid crystal television having the video signal receiving antenna 41, so that the display section 1 can be handled completely wirelessly.

[Effect of device]

Since the position detecting means of the eyepiece display device according to the present invention externally measures the moving position, accurate detection can be performed without causing an error depending on the speed of movement of the neck of the user wearing the display device. Since a large-scale system is unnecessary, the external size of the display part worn by the user can be made small and the weight can be reduced. Also, by making the display unit wireless, it is possible to handle a wide display space in a free posture. Furthermore, if the computer unit can be operated wirelessly from the keyboard, it can be used as a machine interface device with greater flexibility than ever before. Is possible.

[Brief description of drawings]

1 is a block diagram of an eyepiece display device according to the present invention, FIG. 2 is a block diagram of the device of FIG. 1, FIG. 3 is a flow chart showing the operation of the device of FIG. 1, and FIG. FIG. 5 is a configuration diagram showing another embodiment of the eyepiece display device, and FIG. 5 is a configuration diagram of a conventional eyepiece display device. 1 ... Display unit, 2 ... Reception unit, 3 ... Computer unit, 4 ... Ultrasonic transmitter, 5 ... IR (infrared) transmitter,
6A, 6B, 6C ... Ultrasonic microphone, 7 ... Reset switch, 25 ... IR detection circuit, 26 ... Counter, 27 ... Ultrasonic detection circuit, 28 ... 1-chip microcomputer.

Claims (1)

[Scope of utility model registration request] 1. An eyepiece display device which is mounted in front of the eye and has a goggle type display section for observing an image on a display device in front of the eye, wherein the image changes in accordance with information of a position detecting means of the display section. In the eyepiece display device, the position detecting means is an ultrasonic oscillator provided in the display unit, an electromagnetic wave oscillator, a plurality of ultrasonic microphones provided separately from the display unit, an electromagnetic wave detection circuit, It comprises a time measuring means and a receiving section having a computing means, receives a reset signal from the electromagnetic wave oscillator by the electromagnetic wave detecting circuit, resets the time measuring means, and then transmits the ultrasonic wave from the ultrasonic oscillator to the ultrasonic microphone. An eyepiece type display device, characterized in that the propagation time of a sound wave is measured by the time measuring means, the position is calculated by the calculating means based on the measured value, and the position of the display unit is detected.