JP2000187465A - Head mounted video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive device enabled to display RGB signals with NTSC signals with a simplified adjusting mechanism. SOLUTION: A NTSC signal is sent to an input signal switching means 23, and analog RGB signals are converted into NTSC signals by a video signal converting circuit 22, and sent to the input signal switching means 23. An input signal selected by the input signal switching means 23, and an image data of n adjusting screen such as notice/warning and brightness/color to an observer from a character generator 26 according to an instruction sent from a control means 25 are mix-processed by a signal processing part 24 into an NTSC signal and sent to a decoder processing part 28. the control means 25 transmits the brightness and color information to the decoder processing part 28 according to the adjusted value set by an observer according to an adjusted value input means 27. The converted RGB signals are outputted from a relay box 12, and transmitted to a display drive circuit 41 of a display part main body 11 via a cable 13, and the video is displayed on a display element 43L for left eye and a display element 43R for right eye.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-mounted video display device which is mounted on a predetermined location of a user, for example, a head or a face to view a display image.

[0002]

2. Description of the Related Art FIG. 7 shows a configuration diagram of a conventional head-mounted video display device using a small and lightweight liquid crystal panel as a display element. An output of a decoder processing unit 1 for inputting video signals and a power switch 2 are shown. Is connected to the display driver 4. Display optical systems 5L and 5R are formed for the left and right eyes, respectively.
Are connected to backlights 7L and 7R for illumination via drivers 6L and 6R, respectively, and the output of the display driver 4 is connected to left and right eye display elements 8L and 8R each composed of a liquid crystal panel that does not emit light. ing. Display element 8
L and 8R each have an optical element 9 composed of a prism.
L, 9R are attached, and the optical elements 9L, 9R are formed with incident surfaces 9La, 9Ra, reflecting surfaces 9Lb, 9Rb, and half mirror surfaces 9Lc, 9Rc, respectively.

When a power switch 2 is input, a power circuit 3
Starts supply of necessary power to the entire image display device. NT which is a video signal from a TV tuner or a video reproducer
The SC signal is sent to the decoder processing unit 1 and is converted to an RGB signal, and then sent to the display driver 4, where the image is displayed on the left and right display elements 8L and 8R. Display element 8 for left and right eyes
Since L and 8R are not self-luminous elements, they are illuminated by backlights 7L and 7R for illumination, respectively, and the image luminous flux on the display elements 8L and 8R enters the incident surfaces 9La and 9Ra of the optical elements 9L and 9R. And the reflection surfaces 9Lb and 9Rb
At an incident angle equal to or greater than the critical angle, is totally reflected, is further reflected by the half mirror surfaces 9Lc and 9Rc, and is again reflected by the reflecting surface 9L.
b, 9Rb at a critical angle or less, and the observer's pupil eL,
Image on eR. As a result, the display element 8L is provided to the observer.
The image displayed on the 8R is magnified and observed.

[0004]

However, in the above-mentioned conventional example, since the decoder processing unit 1 and the display driver 4 are arranged in the display unit main body worn by the user, the circuit scale becomes large. It is difficult to reduce the size and weight. Also, when displaying a character over a video, if a character generator or microcomputer to be used is arranged at the rear of the decoder processing unit 1,
Further, the circuit scale is increased. Further, since the input signal source is compatible with only ordinary television signals, it cannot be connected to a personal computer, a small information equipment terminal, or the like.

An object of the present invention is to solve the above-mentioned problems,
RGB from outside together with video signal such as NTSC signal
An object of the present invention is to provide a head-mounted video display device capable of displaying a signal and simplifying a main body side.

[0006]

According to the present invention, there is provided a head-mounted image display device, comprising: an image display unit; and an optical system for guiding an image displayed on the image display unit to an observer's pupil. Means for converting a RGB signal into a TV signal in a relay box provided separately from the main body and for inputting a video signal; A decoder processing means for converting into a signal is disposed, and the signal is transmitted between the relay box and the video display unit by the RGB signal.

Further, a head mounted video display apparatus according to the present invention has a head mounted video display having, in its main body, an image display means and an optical system means for guiding an image displayed on the image display means to an observer's pupil. In the display device, in a relay box provided apart from the main body and inputting a video signal,
Video signal converting means for converting an RGB signal into a television signal; decoder processing means for converting a television signal into the RGB signal; character display means; and control means. It is characterized by transmission by RGB signals.

[0008] A head mounted video display apparatus according to the present invention comprises: an image display means; an illuminating means for illuminating the image display means; and an optical system means for guiding an image displayed on the image display means to an observer's pupil. , A decoder processing means for converting a television signal into an RGB signal, a signal processing means, and a character display means in a relay box provided separately from the main body and for inputting a video signal. And a control means, and transmitting between the relay box and the video display unit by the RGB signal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a perspective view of a head mounted video display device according to a first embodiment. A display unit main body 11 is connected to a relay box 12 via a cable 13, and a video RGB signal, a video NTSC signal, an audio signal,
Power and the like are transmitted. Relay box 1
2 is a power jack 14, a video input jack 1 for inputting an NTSC signal from a TV tuner or a video reproducer.
5. An input jack 16 for inputting analog RGB signals from a personal computer or a small information equipment terminal, and an audio input jack 17 for inputting audio are provided. Note that the input jacks 15, 16 and the audio input jack 17 may be integrated into one jack.

FIG. 2 shows the display body 11 and the relay box 1.
2, a power supply circuit 21 having a power switch 20 and a video signal conversion circuit 22 to which RGB signals are input are arranged in the relay box 12. The relay box 12 is provided with a connector for connecting to an input signal source, and the connector is provided with a sensor for identifying whether the input signal source is an NTSC signal or an RGB signal. The output of the video signal conversion circuit 22 is NTS
The output of the input signal switching means 25 is connected to a signal processing unit 24 and a control means 25 including a microcomputer and the like, respectively.

The output of the control means 25 is the character generator 2
6, the output of the adjustment value input means 27 is connected to the control means 25. Outputs of the signal processing unit 24 are connected to a control unit 25 via a decoder processing unit 28 and a D / A conversion circuit 29, respectively. The adjustment value input means 27 can be set by a button, a switch, or the like. For example, the input jacks 15, 16, 17 arranged on the relay box 12, or a remote controller capable of communicating with the relay box 12 as shown in FIG. Control part 3
The selection button 32 arranged at 1 allows the observer to set brightness, color tone, volume, etc. according to his / her preference.

The display unit main body 11 includes left and right image display optical systems 40L and 40R and a display drive circuit 41. The output of the decoder processing unit 28 of the relay box 12 is connected to the display drive circuit 41, The output of the circuit 21 is connected to the display drive circuit 41 and the left and right drivers 42L and 42R, respectively.

Image display optical systems 40L, 40R for left and right eyes
In, the output of the display drive circuit 41 is connected to display elements 43L and 43R for left and right eyes composed of a liquid crystal panel that does not emit light, and the outputs of the drivers 42L and 42R are backlights 44L that illuminate the display elements 43L and 43R, respectively.
44R. The display elements 43L, 4L
3R has optical elements 45L, 4 each comprising a prism.
5R is mounted, and the optical elements 45L and 45R are formed with incident surfaces 45La and 45Ra, reflecting surfaces 45Lb and 45Rb, and half mirror surfaces 45Lc and 45Rc, respectively. The backlight is a left-eye backlight 44L.
And the right-eye backlight 44R are separately arranged, and a single left and right backlight is arranged.

In such a configuration, the power switch 2
When 0 is input, the power supply circuit 21 starts supplying power required for the entire image display device. An NTSC signal, which is a TV video signal from a TV tuner or a video reproducer, or an analog RGB signal from a personal computer, a small information equipment terminal, or the like is input to the relay box 12. N
The TSC signal is sent to the input signal switching means 23, and the analog RGB signal is converted into an NTSC signal by the video signal conversion circuit 22 and sent to the input signal switching means 23. The control means 25 sets the input signal switching means 23 to N according to a signal sent from a sensor of a connector connected to the input signal source.
Switch to either the TSC signal side or the RGB signal side.

The input signal selected by the input signal switching means 23 is sent to the signal processing unit 24, while the character generator 26 follows the instructions sent from the control means 25 to pay attention to the observer, warn, and brightness. The image data of the adjustment screen such as color and color is sent to the signal processing unit 24. These force video signals and the image data from the character generator 26 are mixed and processed by the signal processing unit 24 into NTSC signals, which are sent to the decoder processing unit 28. Control means 2
Reference numeral 5 indicates that the D / A conversion circuit 29 performs D / A conversion of luminance and color information in accordance with the adjustment value set by the observer using the adjustment value input means 27, and transmits the information to the decoder processing unit 28. Here, since the control unit 25 and the decoder processing unit 28 are mounted on the same substrate, the electronic adjustment by the control unit 25 can be easily performed.

The NTSC signal is converted into an RGB signal in a decoder processing section 28 in accordance with the luminance and color information received from the D / A conversion circuit 29. Converted RGB
The signal is output from the relay box 12 and the cable 13
Is transmitted to the display drive circuit 41 of the display unit main body 11 via. Then, the display driving circuit 41 displays an image on the left-eye display element 43L and the right-eye display element 43R. Here, since the left and right display elements 43L and 43R are not self-luminous display elements, the backlights 44L and 44 for illumination are used.
R is illuminated.

The images of the display elements 43L and 43R illuminated by the backlights 44L and 44R are incident on the incident surface 35La of the optical element 35L, are incident on the reflecting surface 35Lb at an incident angle greater than the critical angle, and are totally reflected. The totally reflected light is reflected by the half mirror 35Lc, enters the reflection surface 35Lb at a critical angle or less, and forms an image on the pupil eL of the observer. As a result, an observer observes the image displayed on the display element 43L in an enlarged manner.

At this time, R from the decoder processing means 28
The GB signal is directly sent to the display unit 1 via the cable 13.
However, it is also possible to adopt a configuration in which the amplitude of the RGB signal is amplified by an amplifier and then transmitted to the display unit main body 11 as a measure against noise.

The brightness, hue and volume of an image can be adjusted by the adjustment input means 27. When the observer presses, for example, the selection button 31, the control means 25 sends an instruction to display an adjustment screen to the character generator 26. The character generator 26 that has received the instruction sends an image signal for displaying the adjustment screen to the signal processing unit 24, and the display screen displays FIG.
Is displayed. The observer operates the selection button 32 while looking at the adjustment screen to set values such as brightness, hue, and volume.

As described above, the relay box 1 is not mounted on the display unit main body 11 on which the observer wears the decoder processing unit 28.
By arranging them in 2, the circuit scale of the display unit main body 11 can be reduced, and the size and weight can be reduced. As the circuit scale of the display unit body 11 is reduced, the current transmitted to the display unit body 11 can be reduced, and the cable 13 such as a power supply line connecting the relay box 12 and the display unit body 11 is made thinner. It becomes possible. Further, by mounting the decoder processing unit 28 and the control means 25 on the same substrate, electronic control of brightness, color, and volume under microcomputer control becomes easy. As a result, the adjustment mechanism can be simplified, and parts such as a volume can be reduced.

An amplifier is provided in the relay box 12 to
By amplifying the signal, the influence of noise can be reduced. Therefore, not only the NTSC signal for TV video from a TV tuner or a video reproducer but also the analog RGB from a personal computer or a small information equipment terminal can be used.
An image display device having a general-purpose function capable of displaying a signal can be provided.

FIG. 5 shows a configuration diagram of the second embodiment, and the display unit main body 11 is the same as that of the first embodiment, so that the illustration is omitted. The output of the video signal conversion circuit 50 to which the RGB signals are input is connected to input signal switching means 51 for switching to an NTSC signal. The output of the input signal switching unit 51 is connected to a signal processing unit 53 via a decoder processing unit 52 and to a control unit 54. Control means 5
4 is connected to the output of the adjustment value input means 55, the output of the control means 54 is connected to the decoder processing section 52 via the D / A conversion circuit 56, and to the signal processing section 53 via the character generator 57. It is connected.

When the power switch 20 is turned on, the power circuit 21 starts to supply necessary power to the entire image display device. An NTSC signal, which is a TV video signal from a TV tuner or a video reproducer, or an analog RGB signal from a personal computer, a small information equipment terminal, or the like is input to the relay box 12, as in the first embodiment. .

The NTSC signal is sent to input signal switching means 51, and the analog RGB signal is converted into an NTSC signal by video signal conversion means 40 and sent to input signal switching means 51. A sensor provided at a connector for connecting to an input signal source identifies whether the input signal source is an NTSC signal or an RGB signal, and the control means 16 determines an input signal switching means 51 according to a signal sent from the sensor. Is switched to either the NTSC signal side or the RGB signal side, and the selected input signal is sent to the decoder processing unit 52. The control means 54 converts the luminance and color information into a D / A conversion circuit 56 according to the adjustment value set by the observer through the adjustment value input means 55.
, And transmits it to the decoder processing unit 52.

In the decoder processing section 52, the NTSC signal is converted into an RGB signal in accordance with the luminance and color information received from the D / A conversion circuit 56 and sent to the signal processing section 53. On the other hand, the character generator 57 follows the instruction sent from the control means 54 to pay attention and warning to the observer,
The image data of the adjustment screen such as brightness and color is converted to a signal processing unit 5.
Send to 3. In the signal processing unit 53, the input video signal and the image data from the character generator 57 are mixed and converted into RGB signals.
And transmitted via the cable 13 to the display drive circuit 41 arranged in the display unit main body 11.

As described above, the character generator 57 for displaying the warning screen for the observer and the adjustment screen such as the brightness and the color is provided at the rear of the decoder processing unit 52, and the RGB output of the character generator 57 is used. With NT
Compared with the case of using the SC output, there are fewer restrictions on colors, and it is possible to easily and inexpensively display a warning screen and an adjustment screen which are easier for the observer to see, and a general-purpose character generator 57 is provided. Your choices for use will expand.

FIG. 6 is a block diagram of the third embodiment. The output of the input signal switching means 61 for switching between an RGB signal input directly and an NTSC signal input via the decoder processing section 60 is a signal. The processing unit 62 is connected to the control unit 63. The control unit 63 is connected to the output of the adjustment value input unit 64, and the output of the control unit 63 is connected to the D / A conversion circuit 6.
5. Connected to the signal processing unit 62 via the character generator 66. The output of the signal processing unit 62 is connected to the display drive circuit 41 of the display unit main body 11, and the other components are the same as those of the first embodiment.

An NTSC signal, which is a TV video signal from a TV tuner or a video reproducer, or an analog RGB signal from a personal computer, a small information equipment terminal, or the like is input to the relay box 12. The analog RGB signal is sent to the input signal switching means 61, and the NTSC signal is converted into an RGB signal by the decoder processing section 60 and sent to the input signal switching means 61.

A connector for connecting to an input signal source arranged in the relay box 12 is provided with a sensor for identifying whether the input signal source is an NTSC signal or an RGB signal. The control means 63 switches the input signal switching means 61 to either the NTSC signal side or the RGB signal side in accordance with the signal sent from this sensor, and the selected input signal is sent to the signal processing unit 62. On the other hand, the character generator 66 sends to the signal processing unit 62 image data of an adjustment screen such as a notice / warning for an observer and brightness and color in accordance with an instruction sent from the control unit 63. In the signal processing section 62, the input video signal and the character generator 66
Are subjected to a mixing process to become RGB signals.

The control means 63 allows the observer to input the adjustment value input means 6
In accordance with the adjustment value set in step 4, the D / A conversion circuit 65 performs D / A conversion of the information of the luminance and color, and the signal processing unit 6
Send to 2. Here, the signal processing unit 62 and the control unit 63
Are mounted on the same substrate, the electronic adjustment by the control means 63 can be easily performed. RGB signal is D
The signal value is converted in accordance with the luminance and color information received from the / A conversion circuit 65 and transmitted from the relay box 12 to the display drive circuit 41 disposed on the display unit main body 11 worn by the subject via the cable 13. Is done. Here, the RGB signals from the signal processing unit 62 are transmitted to the display unit main body 11 through the cable 13 as they are, but after the amplitude of the RGB signals is amplified by an amplifier as a measure against noise,
It is also possible to adopt a configuration for transmission to the display unit main body 11.

In this way, not only an NTSC signal, which is a television image from a television tuner or a video reproducer, but also an analog RGB signal from a personal computer, a small information equipment terminal, or the like can be displayed. Furthermore,
Since it is not necessary to convert the RGB input signal into the NTSC signal by the video signal conversion means, the circuit scale can be reduced, the size and weight can be reduced, and an inexpensive device can be realized.

Also, by mounting the signal processing means 62 and the control means 63 on the same substrate, electronic control of brightness, color and volume under microcomputer control becomes easy. As a result, the adjustment mechanism can be simplified, and parts such as a volume can be reduced. Also, by providing an amplifier in the relay box 12, R
The influence of noise on the GB signal can be reduced.

[0033]

As described above, the head-mounted video display device according to the present invention comprises a video signal conversion means and a decoder processing means or a character display means and a control means or a decoder processing means in a relay box. By arranging the signal processing means and the control means, and performing transmission between the relay box and the video display unit using RGB signals, a video signal from a TV tuner or a video reproducer, for example, NTSC
An apparatus in which a main body having a general-purpose function capable of displaying not only signals but also analog RGB signals from a personal computer, a small information device terminal, or the like can be provided as a miniaturized device.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a configuration diagram of a display unit main body and a relay box.

FIG. 3 is a perspective view of a remote control unit.

FIG. 4 is an explanatory diagram of a display screen.

FIG. 5 is a configuration diagram of a second embodiment.

FIG. 6 is a configuration diagram of a third embodiment.

FIG. 7 is a configuration diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Display main body 12 Relay box 13 Cable 21 Power supply circuit 22, 50 Video signal conversion circuit 23, 51, 61 Input signal switching means 24, 53, 62 Signal processing unit 25, 54, 63 Control means 26, 57, 66 Character generation Units 27, 55, 64 Adjustment value input means 28, 52, 60 Decoder processing unit 31 Remote control unit 32 Selection button 40L, 40R Image display optical system 41 Display drive circuit 43L, 43R Display element 44L, 44R Backlight 45L, 45R Optics element

Claims (11)

[Claims] 1. A head-mounted image display device having, in a main body thereof, an image display means and an optical system means for guiding an image displayed on the image display means to an observer's pupil, wherein a video signal is provided separately from the main body In the relay box where you enter
Video signal conversion means for converting an RGB signal into a television signal, and decoder processing means for converting a television signal into the RGB signal are arranged, and the RGB signal is transmitted between the relay box and the video display unit. Head mounted video display device. 2. The head-mounted type according to claim 1, wherein a sensor for identifying an input signal source and switching means for switching between using an RGB signal or a television signal as an input signal are arranged in the relay box. Video display device. 3. The head mounted image display device according to claim 1, further comprising an amplifier for amplifying and transmitting the amplitude of the RGB signal. 4. A head-mounted image display device having, in a main body thereof, an image display means and an optical system means for guiding an image displayed on the image display means to an observer's pupil. In a relay box for inputting a signal, video signal conversion means for converting an RGB signal into a television signal, decoder processing means for converting a television signal into the RGB signal, character display means, and control means are arranged, A head-mounted video display device, wherein the RGB signal is transmitted between a relay box and a video display unit. 5. The decoder processing means, the character display means, and the control means are mounted on the same substrate,
5. The head mounted video display device according to claim 4, wherein said control means electronically adjusts a video parameter. 6. The circuit according to claim 6, wherein the character display means is configured as follows:
5. The head mounted video display device according to claim 4, wherein said head mounted video display device is provided at a front part of said decoder processing means. 7. The method according to claim 7, wherein the character display means is configured as follows:
5. The head mounted video display device according to claim 4, wherein said head mounted video display device is provided at a rear portion of said decoder processing means. 8. A head-mounted image display device having, in a main body thereof, image display means, illumination means for illuminating the image display means, and optical system means for guiding an image displayed on the image display means to an observer's pupil. In a relay box provided apart from the main body and for inputting a video signal, a decoder processing means for converting a television signal into an RGB signal, a signal processing means, a character display means, and a control means are arranged, A head-mounted video display device, wherein the RGB signal is transmitted between a relay box and a video display unit. 9. The head mount according to claim 8, wherein a sensor for identifying an input signal source and switching means for switching between using the RGB signal or the television signal as an input signal are arranged in the relay box. Type image display device. 10. The head mounted image according to claim 8, wherein said decoder processing means, said character display means, and said control means are mounted on a same substrate, and said control means performs electronic adjustment of image parameters. Display device. 11. The head-mounted image display device according to claim 8, further comprising an amplifier for amplifying and transmitting the amplitude of the RGB signal.