JPH11119688A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable even a soft engineer in charge of a video to easily operate a voice signal and to enable the voice signal to be controlled by a video reproducing device by using the voice signal for a signal controlling the display state of the video. SOLUTION: The voice signals of two channels supplied by a personal computer 10 are respectively used as the control signals for changing the display brightness and the distance of the video. Besides, the control contents of the voice signals are decided according to the frequencies thereof. Then, the voice signals are respectively converted into the digital signals of values corresponding to the frequencies by F/D converters 7c and 7d and transmitted to a CPU 7e. Then, the control content corresponding to the frequency shown by the digital signal is decided. By controlling an inverter 4a according to the control content, the brightness of the illumination of a back light 4 is changed. By rotating a motor 5 by controlling a motor driver 7f, an LCD panel 3 is moved up and down together with the light 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device such as a head-up display which can control the brightness and volume of an image.

[0002]

2. Description of the Related Art In recent museums, automatic guidance systems using a head-up display have been widely used. This head-up display is for explaining an exhibit by reproducing and displaying a video signal sent from a personal computer or the like installed outside. At this time, in addition to the video signal, a control signal is sent from a personal computer or the like using digital communication such as the RS-232C standard to fade in / out the video or move the display focal length of the video. In some cases, the display form is controlled by changing the perspective, for example, to enhance the expressive power of the video.

The source of the video to be reproduced and displayed on the head-up display is created by a video-related artist on a computer using a development tool (application software) for operating digitized video and audio. General.

[0004]

However, since artists related to video are often experts in video and audio, but not in computers, they are usually in communication control according to the RS-232C standard or the like. It is difficult to create a program that performs For this reason, conventionally, in order to enhance the expressive power by controlling the display mode of the video, in addition to the software engineer in charge of the video, a software There is a problem that an engineer is required, and it takes a long time to create a video source and the cost is high.

Conventionally, since a communication function is required to control the display mode of an image, a video reproducing apparatus (such as a laser disk apparatus) that outputs only an image signal and an audio signal is used. There is also a problem that the head-up display cannot be controlled for communication.

The present invention has been made in view of the above circumstances, and can be easily operated by a software engineer in charge of video by using an audio signal as a control signal of a video display form, and can be controlled by a video reproducing apparatus. It is an object of the present invention to provide a display device that can perform the display.

[0007]

According to a first aspect of the present invention, a display device includes:
Since the audio signal is used as the control signal and the display mode of the video can be changed according to the attribute of the audio signal, the display mode can be changed simply by arranging the audio signal of the appropriate attribute at an appropriate timing in the video source. Can be controlled. Therefore, the display form can be easily controlled even by a software engineer in charge of video who does not have knowledge of communication control, so that the expressive power of the display device can be easily increased.

Further, since an audio signal is used as a control signal, even a video reproducing apparatus which can output only a video signal and an audio signal occupies one or more audio tracks or multiplexes the original audio signal. Thus, this control signal can be sent. Therefore, it is possible to control the display mode of the video and increase the expressive power of the display device by using an inexpensive video playback device without using an expensive personal computer or the like.

According to the display device of the present invention, the original sound reproduction mode can be controlled by the audio signal used as the control signal, so that the expression power of the display device can be further enhanced.

[0010]

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

1 and 2 show an embodiment of the present invention. FIG. 1 is a partially sectional perspective view showing a structure of a head-up display, and FIG. 2 is a circuit diagram of the head-up display. FIG.

In this embodiment, a head-up display that can display an image over a background by reflecting an image displayed on an LCD panel by a combiner will be described. In addition, this head-up display can change the perspective by moving the display focal length of the image displayed as a virtual image by changing the distance between the LCD panel and the optical system.

As shown in FIG. 2, the head-up display 1 has an LCD panel 3 and a backlight 4 in a central portion of a housing 2. The backlight 4 is L
This is an illumination device that is integrally attached to the back surface of the CD panel 3 and uniformly irradiates the LCD panel 3 with light from a fluorescent tube from the back side. The LCD panel 3 is a liquid crystal display device of a dot matrix system, and performs display by controlling the voltage applied to the liquid crystal layer of each pixel to change the transmittance of light from the backlight 4. The LCD panel 3 and the backlight 4 are screwed into a screw rod 6 rotated by a motor 5 and move up and down in accordance with the rotation of the screw rod 6. The display, illumination, and rotation of the LCD panel 3, the backlight 4, and the motor 5 are controlled by a CPU board 7 disposed below the housing 2. The CPU board 7 of the head-up display 1 includes a personal computer 1 installed outside.
Connected to 0.

A lens group 8 is arranged above the LCD panel 3 in the housing 2, and a combiner 9 is mounted on the housing 2. The combiner 9 is a half mirror formed by coating a transparent resin plate or the like.
The display image on the CD panel 3 is reflected and these are superimposed and displayed. The lens group 8 includes the LC
This is an optical system for reflecting the display image of the D panel 3 as a distant virtual image by the combiner 9. Therefore, combiner 9
The image displayed on the LCD panel 3 reflected by the image appears as if it is at a distance as well as the background. LCD panel 3
Is moved up and down, the distance between the lens group 8 and the lens group 8 moves, so that the apparent display focal length of the image displayed on the LCD panel 3 can be moved to change the perspective.

Head-up display 1 having the above structure
1 is shown in FIG. Personal computer 1
Numeral 0 supplies a two-channel audio signal to the CPU board 7 of the head-up display 1 together with the video signal. Here, the case where the video signal is transmitted as a component signal in which the RGB signal and the synchronization signal are separated is shown. However, the video signal may be collectively transmitted as a composite signal and separated on the head-up display 1 side. In the CPU board 7, the RGB signals of the video signals are converted into digital signals by the A / D converter 7a, and the synchronizing signals are converted into timing signals by the timing circuit 7b and sent to the LCD panel 3. The LCD panel 3 captures the RGB signals for each pixel by a shift register based on the timing signal.
A horizontal synchronizing signal and a vertical synchronizing signal are generated by a frequency dividing circuit, and an image is displayed by a dot matrix method. This image is reflected by the combiner 9 via the lens group 8 by the illumination of the backlight 4, and is projected on the background.
The backlight 4 emits light from the fluorescent tube using a high-frequency power source supplied from the inverter 4a. Although the video signal is described here as a video signal of a moving image, a signal of a still image can also be used.

The two-channel audio signals supplied by the personal computer 10 are used as control signals for changing the display brightness and perspective of the video. In addition, since the control content of these audio signals is determined according to their frequencies, they become tone signals of any given frequency. These audio signals are respectively F
The signals are converted into digital signals having values corresponding to the frequencies by the / D converters 7c and 7d and sent to the CPU 7e. CP
In U7e, the control content corresponding to the frequency indicated by these digital signals is determined, and the inverter 4a and the motor driver 7f are controlled according to the control content.
That is, assuming that the audio signal (1) of the first channel is a control signal for changing the display brightness of the video, the control content is determined from the frequency of the audio signal (1), and the inverter 4a is operated in accordance with the control content. Is controlled, the brightness of the illumination of the backlight 4 is changed. If the audio signal (2) of the second channel is a control signal for changing the perspective of the video, the control content is determined from the frequency of the audio signal (2), and the motor driver is selected according to the control content. By controlling the motor 7fa to rotate the motor 5, the LCD panel 3 is moved up and down along with the backlight 4 along the screw rod 6 according to the rotation direction and the number of rotations of the motor 5.

The video signal and the two-channel audio signal output from the personal computer 10 are created on a computer by a video artist using a development tool. At this time, the video signal can be created by a conventional method by digitizing a video serving as a material, appropriately processing and combining the video. If you want to control the display brightness and perspective of this video, use the same method as when creating the original audio signal,
Select the tone signal of the frequency corresponding to the control content,
What is necessary is just to arrange | position at an appropriate timing in any channel. A tone signal having a frequency corresponding to each control content is prepared in advance as a digital sound file.

Head-up display 1 having the above structure
According to the above, since the audio signal which can be easily handled by the artist related to video is used as the control signal, it is possible to easily change the display brightness and the perspective of the video, so that the software engineer who is in charge of the communication control can use the control signal. You can create richly expressive images without borrowing.

Although the personal computer 10 is used in the above embodiment, the present invention only needs to send a video signal and an audio signal to the head-up display 1. They can also be used to supply these. In other words, by using an inexpensive laser disk device or the like, it is possible to display an image with abundant expressive power on the head-up display 1 without using an expensive personal computer 10.

In the above-described embodiment, the case has been described in which the audio signals of two channels are both occupied as control signals. However, only one channel is used as the control signal, and the remaining one channel is used as the control signal.
Head-up display 1 for audio signal of channel
To play back as audio and add sound to the video. Further, the audio signal used as the control signal is
It can be multiplexed with the original audio signal and supplied. For example, if a tone signal is encoded instead of sound field information by using a surround method in which stereo sound and sound field information are encoded to generate a two-channel audio signal, this is decoded on the head-up display 1 side. Thus, an audio signal of a control signal can be obtained in addition to the two-channel stereo audio. However, if three or more audio signals can be supplied, a channel other than stereo audio may be used exclusively for the audio signal of the control signal.
Further, here, the description has been made assuming that the audio signal of the control signal is supplied together with the video signal and the original audio signal. However, for example, the video signal and the original audio signal are built in the head-up display 1 and the control signal is supplied. It is also possible to supply only the audio signal from the outside.

Further, in the above-described embodiment, the case where the display brightness and the perspective of the image are controlled has been described. However, the present invention is not limited to this. Can be applied to all controls. As other control of the display mode, there are, for example, enlargement / reduction of a display image, fade-in / out, control of color tone, and the like. The enlargement and reduction of the displayed image can be easily performed by controlling the timing circuit 7b by the CPU 7e.
In addition, fade-in / out and color control are controlled by RGB.
If the signal can be output through a filter circuit or the like controlled by the CPU 7e, this can be easily achieved. However, some of the display forms of these images can be changed by processing the image itself as a material. However, according to the present invention, not only the effect of making the processing of the video itself unnecessary, but also the display focal length is changed by moving the LCD panel 3 up and down as shown in the present embodiment. Thus, it is possible to obtain an effect that it is possible to change a display mode that cannot be expressed by processing the video itself.

Further, in the above embodiment, the case where only the display mode of the video is controlled has been described. However, when the head-up display 1 also reproduces the original voice, the control signal of the voice signal controls this voice signal. The playback mode can also be controlled. The control of the reproduction mode of the audio may be anything as long as the same audio signal is used to reproduce the sound in different ways, and for example, the volume and frequency characteristics can be changed.

Further, in the above embodiment, tone signals having different frequencies for each control content are used as the audio signal of the control signal. However, the head-up display 1 can easily identify and interpret the control content. The attribute is not necessarily limited to this. As the attribute of such an audio signal, in addition to the frequency, for example, a difference in amplitude of the audio signal, a sound length, an interval or number of pulse sounds, or a combination thereof can be used.

Further, in the above-described embodiment, the head-up display 1 has been described. However, the present invention is not limited to this, and the present invention can be similarly applied to display devices in general.

[0025]

As is clear from the above description, according to the display device of the present invention, the display mode of the video can be easily controlled even by the software engineer in charge of the video having no knowledge of the communication control. Expression can be easily enhanced. In addition, by controlling the display mode of a video using an inexpensive video playback device, the expressiveness of the display device can be enhanced. Further, the mode of reproducing the original sound by the display device can be similarly controlled.

[Brief description of the drawings]

FIG. 1, showing one embodiment of the present invention, is a partial cross-sectional perspective view illustrating a structure of a head-up display.

FIG. 2, showing an embodiment of the present invention, is a block diagram illustrating a circuit configuration of a head-up display.

[Explanation of symbols]

 1 Head Up Display 3 LCD Panel 4 Backlight 4a Inverter 5 Motor 6 Screw Rod 7 CPU Board 7c F / D Converter 7d F / D Converter 7e CPU 7f Motor Driver

Claims (2)

[Claims] 1. A display device capable of changing a display mode of an image, receiving an audio signal as a control signal, detecting whether the attribute of the audio signal corresponds to a predetermined attribute, and controlling the control signal. A display device comprising: an audio signal interpreting means for interpreting a video signal; and a display mode control means for changing a display mode of a video image in accordance with the control content of a control signal interpreted by the audio signal interpreting module. 2. A display device that reproduces sound together with video and that can also change the reproduction form of the sound, wherein the display form control means responds to control contents of a control signal interpreted by the audio signal interpretation means. 2. The display device according to claim 1, wherein the reproduction mode of the audio can be changed.