JP2010010795A - Video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display device capable of simultaneously handling differences in setting values of volume and sound quality among persons when the plurality of persons view the display device (projector or flat panel display). <P>SOLUTION: The video display device has a plurality of output terminals for audio input and output and an adjusting means for voice and sound quality corresponding to each of the terminals. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to audio output of a display device (a projector or a flat panel display). The present invention proposes a technique for improving the usability of a display device having an audio terminal, particularly an earphone terminal.

  Some display devices have audio input / output terminals and speakers. In addition, there are products having earphone terminals, and there are also products that allow users to appreciate video and audio without hesitation even in situations where large audio output causes trouble for others, such as at night. In addition, there are products with two or more earphone terminals, and there are products that allow multiple people to view video and audio at the same time.

An example of such a product will be described with reference to FIG. 2 (circuit block configuration diagram).
The display device shown in FIG. 2 is an example of a flat panel display.

  First, the flow of the video signal will be described.

  Reference numeral 1 denotes a video input circuit which receives an input video signal and generates a video signal in a predetermined format. The obtained video signal is added to the next two video signal processing circuits, and further added to the next three display drive circuits. This drive signal output is applied to the display panel 4, and this display panel is illuminated by a backlight (light source) (not shown) to display an image.

  Both the video signal processing circuit 2 and the display driving circuit 3 are under the control of a controller composed of 7 microcomputers, and their operations and functions are controlled.

  Reference numeral 8 denotes an operation panel. By operating a plurality of buttons arranged on the operation panel, this operation is read by the controller 7 so that necessary functions can be performed.

  Next, the flow of the audio signal will be described.

An audio input circuit 9 receives the input audio signal and adds the audio signal to the next 10 audio amplifier circuits. The sound signal added to 10 is changed and set in volume and sound quality under the control of the controller 7, and is output to the outside from the next sound output terminal. In this conventional example, there are a plurality of audio output terminals (11a and 11b), and simultaneous viewing by earphone output of up to two persons is possible.
JP 2003-204491 A

  Now, with the display device shown in the background art, it is possible to view video and audio simultaneously by a plurality of people, but the following problems may occur.

  Since only one means for adjusting the volume is provided, each viewer listens to the sound with the same volume and sound quality. There is no problem if each viewer is not dissatisfied with the same volume. Not always.

  In view of the above problems, the present invention solves the above problems by providing a plurality of volume and sound quality adjusting means corresponding to a plurality of output terminals.

  In addition, several volume and sound quality setting methods have been proposed for each of them, and a more convenient display device can be provided.

According to claim 1,
In one display device having an audio output terminal, it is possible for a plurality of viewers to enjoy video and audio at an optimal volume and sound quality for each without causing trouble in the surrounding area.

According to claim 2,
By making a plurality of viewers operate independent sound control means (volume etc.), it becomes possible to set each favorite volume and sound quality.

According to claim 3,
By providing a common audio control means (volume or the like) and switching it to be used, a plurality of viewers can perform independent audio control with a small number of adjustment means.

  Next, details of the present invention will be described in accordance with the description of the embodiments. Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  An embodiment of the present invention will be described with reference to FIG. 1 (circuit block configuration diagram).

  The display device shown in FIG. 1 is an example of a liquid crystal projector.

  First, the flow of the video signal will be described.

  Reference numeral 1 denotes a video input circuit which receives an input video signal and generates a video signal in a predetermined format. The obtained video signal is added to the next two video signal processing circuits, and further added to the next three display drive circuits. Here, a driving signal for the four display panels is generated.

  Both the video signal processing circuit 2 and the display driving circuit 3 are under the control of a controller composed of 7 microcomputers, and their operations and functions are controlled.

  A light source lamp 5 and a projection lens unit 6 project an image formed on the display panel surface onto a screen (not shown) with the display panel 4 interposed therebetween.

  Reference numeral 8 denotes an operation panel. By operating a plurality of buttons arranged on the operation panel, this operation is read by the controller 7 so that necessary functions can be performed.

  Next, the flow of the audio signal will be described.

  An audio input circuit 9 receives the input audio signal and applies the audio signal to the next two systems of audio amplifier circuits (the first audio amplifier 10a and the second audio amplifier 10b). The audio signal applied to 10a and 10b is changed and set in volume and sound quality by individual control (first control and second control) from 7 controllers, and is output to the outside from the next audio output terminal. The

  There are a plurality of audio output terminals (first audio output terminal 11a and second audio output terminal 11b), and simultaneous viewing by earphone output of up to two persons is possible.

  Although not clearly shown in the figure, each output terminal may be monaural, stereo, or even a multi-channel (such as 5.1Ch) output.

  Next, the audio amplifier circuit 10 will be described in some detail with reference to FIG.

  The circuit diagram shown in FIG. 3A uses an electronic volume control circuit, and the volume and the like are controlled by digital control from the controller. An electronic volume amplifier 102 controls the volume by digital control 103. Reference numeral 104 denotes a power amplifier that performs sufficient power amplification to drive the earphone.

  FIG. 3B shows a volume circuit that can replace the electronic volume 102 shown in FIG. This is a circuit for controlling the volume by analog control, and by directly rotating the volume, the volume can be controlled without using a controller.

  Next, some operation means will be described with reference to FIG. 4 (partly using FIGS. 5 and 6).

FIG. 4 (A):
This indicates an operation button (part) of the display device main body or an operation button (part) of the infrared remote controller. The up / down / left / right arrow buttons, [OK] button, and [MENU] button are a group of buttons for general menu operations. The [VOL1] and [VOL2] buttons are arranged nearby, and these combinations The volume control function is achieved by operation.

  The flow of this process will be described with reference to the flowchart of FIG.

  First, the volume adjustment mode is entered by pressing the [VOL1] button or the [VOL2] button.

  This flowchart is a flow of processing after entering the volume adjustment mode.

First, the last selected adjustment volume (VOL1 or VOL2) is set. If it is exactly the first, the default value VOL1 is set. Then, the corresponding volume adjustment display appears on the screen. (Shown on the right side of FIG. 4A)
After that, [↑], [↓], [VOL1], [VOL2], and [OK] buttons are scanned. If [↑], the volume is increased (third volume adjustment means), [↓] If so, the volume is lowered (third volume adjusting means). If it is [VOL1], it is switched to VOL1 (volume display) (first setting means), and if it is [VOL2], it is switched to VOL2 (volume). (Display also) (second setting means) If [OK], the volume adjustment mode is terminated.

  If no button operation is performed for a predetermined time, a time-out occurs, and in this case also, the volume adjustment mode process is terminated.

  When the volume adjustment mode ends, the volume adjustment display disappears from the screen.

FIG. 4 (B):
This indicates an operation button (part) of the display device main body or an operation button (part) of the infrared remote controller. The up / down / left / right arrow buttons, [OK] button, and [MENU] button are a group of buttons for general menu operations. The [VOL] button is placed nearby, and the volume adjustment function is achieved by combining these buttons. Plays.

  The flow of this process will be described with reference to the flowchart of FIG.

  First, the volume adjustment mode is entered by pressing the [VOL] button.

  This flowchart is a flow of processing after entering the volume adjustment mode.

First, the last selected adjustment volume (VOL1 or VOL2) is set. If it is exactly the first, the default value VOL1 is set. The volume adjustment display (VOL1 and VOL2) appears on the screen. (Shown on the right side of FIG. 4B)
After that, the five buttons [↑], [↓], [←], [→], and [OK] are scanned. If [↑], the volume is increased (third volume adjusting means), [↓] If so, the volume is lowered (third volume adjusting means), if [←] is switched to VOL1 (also volume display) (first setting means), if [→] is switched to VOL2 (volume) (Display also) (second setting means) If [OK], the volume adjustment mode is terminated.

  If no button operation is performed for a predetermined time, a time-out occurs, and in this case also, the volume adjustment mode process is terminated.

  When the volume adjustment mode ends, the volume adjustment display disappears from the screen.

FIG. 4C:
This indicates an operation button (part) of the display device main body or an operation button (part) of the infrared remote controller. This is a group of buttons only for volume adjustment, [+] button and [-] button for VOL1 (first sound adjustment operation means), [+] button and [-] button for VOL2 (second sound) Adjustment operation means), and the above four.

  Since the process is very simple, it will be described without using a flowchart.

When one of the four buttons is pressed, the volume adjustment mode is entered, and volume adjustment displays (VOL1 and VOL2) appear on the screen. (Shown on the right side of FIG. 4C)
If no button operation is performed for a predetermined time, a time-out occurs and the volume adjustment mode processing is terminated.

  The above three embodiments correspond to the circuit configuration using the electronic volume shown in FIG.

  On the other hand, an example corresponding to the circuit configuration (using an analog volume) shown in FIG.

FIG. 4 (D):
Since this uses an analog circuit, it cannot be placed on the display device itself. Two volume rings are exposed on the side of the main body, and the left side is VOL1 (first voice adjustment operation means) and the right side is VOL2 (second voice adjustment operation means).

  In this example, there is no display on the screen.

Circuit block diagram of the present invention Circuit block diagram of conventional example The figure for demonstrating the audio | voice amplification circuit of this invention The figure for demonstrating some operation means of this invention Flowchart in the embodiment of the present invention Flowchart in the embodiment of the present invention

Claims (3)

Display means for performing display according to the input video signal;
Audio signal amplifying means for amplifying and outputting the input audio signal;
The audio signal amplification means includes
First audio amplification means for receiving the audio signal and outputting the audio signal to a first audio output terminal;
A second audio amplifying means for receiving the audio signal and outputting the audio signal to a second audio output terminal;
The first sound amplifying means is variable in sound amplification factor or sound quality by external first control,
The video display device according to claim 2, wherein the second audio amplifying means has a variable audio amplification factor or sound quality by a second control from the outside. First sound adjustment operation means for adjusting the sound of the first sound amplification means;
2. The video display device according to claim 1, further comprising second sound adjustment operation means for adjusting sound of the second sound amplification means. A third voice adjustment operation means;
First setting means for setting to adjust the sound of the first sound amplification means in response to the operation of the third sound adjustment operation means;
2. The video according to claim 1, further comprising: second setting means configured to adjust the sound of the second sound amplifying means in response to the operation of the third sound adjusting operation means. Display device.

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