KR20000047550A - Display device - Google Patents

Abstract

PURPOSE: A display device is provided which is able to adjust the volume and remember the adjusted volume and previously prevent the output of an unexpected and excessive volume generated when a power supply is injected. CONSTITUTION: In the display device which remembers the adjusted volume when the power supply is cut off, a control circuit which controls to perform an output of voice in a fixed initial volume after the power supply being injected and perform an output of voice in a remembered volume after a fixed period of time being passed is equipped with the display device.

Description

Display device {DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a display device such as a liquid crystal display device capable of adjusting the volume and storing the adjusted volume, and more particularly, to a display device that prevents unexpected excessive sound from being output when the power is turned on.

A display device such as a liquid crystal display device receives a video signal and an audio signal from a tuner, a VTR, or the like, displays the video on a liquid crystal panel or the like, and outputs the audio from a speaker.

In recent years, display devices such as TVs and projectors are equipped with a microcomputer or a memory device, and display values such as display image quality and volume are displayed on an image and displayed. The adjustment value is stored in the memory element.

When the power supply of the display device is turned on, the microcomputer reads out adjustment values stored in the storage element and sets display quality, volume, and the like as the adjustment values. This eliminates the need for the user to readjust such adjustments at power-on, allowing the user to use the display immediately with the desired picture quality or volume.

However, a display device used for a large screen television, a projector, or the like at the time of presentation often has a different user every time. If the audio is output as it is when the power is cut, the following inconveniences may occur.

In other words, when the display device is used at a large volume at the time of the previous presentation and the power supply is cut off in that state, the adjustment value of the large volume is stored in the storage element. Therefore, when another user turns on the display device in this presentation, an unexpected loud volume is output, causing discomfort not only to the user but also to viewers in the presentation.

In addition, even when the same user uses the display device and knows that the volume has been increased at the time of the last power cut, there is almost no time from turning on the power to outputting the sound. Can not reduce the discomfort to viewers too.

Accordingly, an object of the present invention is to provide a display device that prevents unexpected excessive audio from being output when the power is turned on.

1 is a block diagram of a liquid crystal display device of the present invention;

2 is a flowchart of a liquid crystal display device according to the first embodiment of the present invention;

3 is a volume display screen of the liquid crystal display device of the present invention;

4 is a flowchart of a liquid crystal display device according to the second embodiment of the present invention;

Fig. 5 is a flowchart of the liquid crystal display device of the third embodiment of the present invention;

6 is an explanatory diagram of an on-screen message at the initial volume of the present invention;

Fig. 7 is a flowchart of the liquid crystal display device of the fourth embodiment of the present invention;

8 is a flowchart of a liquid crystal display device according to a fifth embodiment of the present invention;

Fig. 9 is a flowchart of the liquid crystal display device of the sixth embodiment of the present invention.

[Description of the code]

20 liquid crystal drive circuit

21 liquid crystal display panel

22 remote controller

23 CPU

31 memory elements

32 voice input circuit

33 volume control circuit

34 voice amplification circuit

35 speakers

The above-described object is a display device having a voice output function, wherein after the power of the display device is turned on, the voice output is stopped at a volume such that the sound output is stopped or the sound is not displeased to the viewer. Is achieved by initiating audio output.

According to the present invention, the user can easily adjust the volume for a predetermined period of time, so that the loud volume is output at the same time as the power is turned on, thereby preventing the viewer from being uncomfortable.

In addition, the display device of the present invention is the volume of the on-screen display to the user in the period from when the power is turned on until the user starts to adjust the volume, or from the power is turned on to start the sound output at the volume of the previous use It is characterized by prompting for adjustment.

According to the present invention, the user is urged to adjust the volume on the on-screen display, and the user can easily adjust the volume since there is sufficient time for the voice output to be started at the volume of the previous use. As a result, an unexpected excessive voice is output when the power is turned on, thereby preventing annoyance to viewers.

In addition, the display device of the present invention is characterized in that the volume of the previous use is not immediately output when the power is turned on, but is gradually increased to finally reach the volume of the previous use.

According to the present invention, the volume is gradually increased, so that the user can easily adjust the volume before the volume becomes unpleasantly loud. Moreover, even if the user does not adjust the volume, the loud volume is not suddenly output, thereby reducing the discomfort to the viewer.

[Example]

EMBODIMENT OF THE INVENTION Below, embodiment of this invention is described according to drawing. However, such embodiments do not limit the technical scope of the present invention.

1 is a configuration diagram of a liquid crystal display device of the present invention. In FIG. 1, a case where a video signal, an audio signal, and the like are input to a liquid crystal display device such as a projector or a large-screen monitor from a tuner, a VTR, or the like not illustrated. Since the TV receiver has a built-in tuner circuit, it is possible to extract a video signal, an audio signal, and the like from the TV signal input from the antenna input terminal. The liquid crystal display 100 includes a red signal processing circuit 12 into which a red image signal S3 is input, a green signal processing circuit 13 into which green and blue image signals (not shown) are input, and a blue signal processing circuit ( 14, a clock regeneration circuit 11 for generating a clock signal S2 from the synchronization signal S1, a reference voltage generator 24 for generating a reference voltage of the A / D converter 18, and an on-screen An on-screen controller 25 for generating a display signal S15, a liquid crystal drive circuit 20 for generating a liquid crystal drive signal S9, and a liquid crystal display panel 21 for displaying an image.

The red signal processing circuit 12 supplies a direct current component to the input circuit 15 to which the red video signal S3 is input, the programmable amplifier circuit 16 to amplify the video signal S4, and the video signal S5. On-screen synthesis that combines an additional DC reproduction circuit 17, an A / D converter 18 for converting the video signal S6 into a digital signal, and a digital video signal S7 and an on-screen display signal S15. Has a circuit 19. The green signal processing circuit 13 and the blue signal processing circuit 14 have the same configuration as the red signal processing circuit 12.

In addition, the liquid crystal display device 100 is output from a CPU 23 for storing a control program in a storage medium such as a built-in ROM, an audio input circuit 32 to which an audio signal S23 is input, and a CPU 23. A volume adjusting circuit 33 whose volume is adjusted by the control signal S22, a memory element 31 storing a volume adjusting value of the volume adjusting circuit 33 at the time of power supply cutoff, and a volume adjusting circuit 33 And a speaker 35 driven by the output of the voice amplifying circuit 34, and amplifying the voice signal S25 output from the voice signal S25. The remote controller 22 outputs the remote control signal S10 to cause the CPU 23 to perform various controls.

Next, the operation of the liquid crystal display device 100 will be described. The red video signal S3 input from the outside is input to the red, green, and blue signal processing circuits 12, 13, and 14 together with the green and blue video signals. The CPU 23 sends control signals S11 to the programmable amplifier circuits 16 of the respective red, green, and blue processing circuits 12, 13, and 14 in response to the remote control signal S10 from the remote controller 22. ) To adjust its amplification factor. The video signal S5 having the prescribed voltage amplitude by the programmable amplifier circuit 16 is added with a direct current in the direct current reproduction circuit 17 and converted into a digital video signal S7 in the A / D converter 18.

The digital image signal S7 is synthesized with the on-screen display signal S15 input from the on-screen controller 25 in the on-screen synthesis circuit 19. The synthesized digital image signal S8 is input to the liquid crystal driving circuit 20, converted into a liquid crystal driving signal S9, and output to the liquid crystal display panel 21. The synchronization signal S1 input from the outside is input to the clock regeneration circuit 11 and the liquid crystal drive circuit 20, and the clock regeneration circuit 11 receives the clock signal S2 in phase synchronization with the synchronization signal S1. It generates and outputs to the A / D converter 18 or the like.

On the other hand, the voice signal S23 input from the outside is removed from noise and the like by the voice input circuit 32 constituted by the termination resistor and the filter, and is input to the volume control circuit 33 as the voice signal S24. The volume adjustment circuit 33 adjusts the gain to the programmable in response to the control signal S22 from the CPU 23, and outputs the audio signal S25 adjusted to the predetermined voltage amplitude to the audio amplifier circuit 34. do. The voice amplification circuit 34 power-amplifies the voice signal S25 and outputs it to the speaker 35 to generate voice from the speaker 35.

The CPU 23 is connected to a rewritable nonvolatile memory element 31 such as an EEPROM. When the power supply of the liquid crystal display device 100 is cut | disconnected, the memory | storage element 31 memorize | stores the volume adjustment value of the volume adjustment circuit 33 at that time, and maintains the value during power supply cutting | disconnection. Then, after a predetermined time after the power supply of the liquid crystal display device 100 is turned on, the CPU 23 reads the volume adjustment value from the storage element 31, sets it in the volume adjustment circuit 33, and generates a sound at the same volume as the power supply is cut off. To do output.

Since the liquid crystal display device 100 according to the present embodiment has enough time to output the volume as when the power is cut off, the loud volume during the previous use is output without adjusting the volume at the time of presentation and the user is uncomfortable. Can be prevented in advance. In addition, if a predetermined time elapses, the sound is output at the same volume as in the previous use. If the use state is the same as in the previous use, the user does not need to reset the volume and can improve the operability at the time of presentation.

2 is an operation flowchart of the liquid crystal display device 100 of the first embodiment of the present invention. The program shown in this operation flowchart is stored in a storage medium such as a ROM built in the CPU 23, and the CPU 23 monitors the timer in response to the remote control signal S10 output from the remote controller 22. FIG. The volume adjustment circuit 33 is set. In the following flowchart, the control other than the volume adjustment, for example, the control of the voltage amplitude of the video signal, is omitted.

In FIG. 2, when the power supply of the liquid crystal display device 100 is turned on (step S31), the CPU 23 sets the setting of the volume adjustment circuit 33 to an initial volume, here volume zero, or silent (step S32). Next, the CPU 23 resets the timer (step S33), and starts counting for a predetermined time. As an example, it is assumed to count for 10 seconds. If there is no volume adjustment request during counting, the liquid crystal display 100 displays the image for 10 seconds, but the volume remains the initial volume.

That is, if the CPU 23 does not have a volume adjustment request from the user (No in step S34) and the timer is not 10 seconds (No in step S36), the operation of the remote controller 22 or the liquid crystal display device 100 is performed for 10 seconds. Wait for the volume adjustment request by a switch or the like. If there is a volume adjustment request from the user (Yes in step S34), the CPU 23 sets the volume adjustment circuit 33 to be the volume according to the user's request (step S35). In this case, for example, as shown in FIG. 3, the volume adjustment value is displayed on-screen as "Voice: 12" on the liquid crystal display panel 21, and the liquid crystal display 100 displays an image and simultaneously controls the volume control circuit ( A sound corresponding to the volume adjustment value in 33) is output.

On the other hand, if there is no volume adjustment request after the power is turned on (No in step S34) and the timer counts for 10 seconds (Yes in step S36), the CPU 23 reads the volume adjustment value at the time of power cut from the memory element 31. Then, the volume adjustment value is set in the volume adjustment circuit 33 (step S37), and the audio corresponding thereto is output.

Thereafter, the CPU 23 judges whether there is a volume adjustment request (step S38), and if there is a request (Yes), adjusts the volume (step S38). On the other hand, when there is no volume adjustment request (No), the on / off of the power switch of the liquid crystal display device 100 is judged (step S40), and when the power switch is on (No), it returns to step S38 and adjusts a volume. Wait for the request When the power supply of the liquid crystal display device 100 is cut off (Yes in step S40), the memory element 31 stores the volume adjustment value set in the volume adjustment circuit 33 at that time. This volume adjustment value is set in the volume adjustment circuit 33 when there is no volume adjustment request for 10 seconds from the next power supply (step S37).

As described above, the liquid crystal display device 100 of the present embodiment has an initial volume, ie, a volume zero when the power is turned on, and has enough time to output the same volume as when the power is cut. It is possible to prevent the loud volume during use, so there is no fear of discomfort to the viewer. In addition, if 10 seconds of the initial volume elapses, the same volume is output as in the previous use, and if the use state is the same as in the previous use, the user does not need to reset the volume, thereby improving operability in presentation and the like.

4 is an operation flowchart of the liquid crystal display device of the second embodiment of the present invention. The program shown in this operation flowchart is stored in a storage medium such as a ROM built in the CPU 23 as in the first embodiment, and the CPU 23 outputs the remote control signal S10 output from the remote controller 22. In response to this, the timer is monitored and the volume adjustment circuit 33 is set.

In the operation flowchart of the first embodiment shown in Fig. 2, since the CPU 23 sets the initial volume of the volume adjustment circuit 33 to zero (silent) when the power is turned on, the audio signal is transmitted to the liquid crystal display device 100. Whether or not S23 is input correctly is unknown. Therefore, in the second embodiment, the volume adjusting circuit 33 is set so as to output a noise level such that no predetermined discomfort is given as the initial volume immediately after the power is turned on (step S46). Accordingly, when the voice signal S23 is input, the voice of the noise level is output, so that anxiety of the user can be solved. The operation flowchart after step S33 is the same as that of the first embodiment.

Fig. 5 is an operation flowchart of the liquid crystal display device of the third embodiment of the present invention. The program shown in this operation flowchart is stored in a storage medium such as a ROM built in the CPU 23 as in the above-described embodiment, and the CPU 23 outputs the remote control signal S10 output from the remote controller 22. In response to this, the timer monitoring and the volume adjustment circuit 33 are set.

The third embodiment is characterized in that the user is informed in the on-screen display when outputting at an initial volume different from the volume at the time of last use in a predetermined period after the power is turned on.

That is, after the power is turned on, the volume adjustment value of the volume adjustment circuit 33 is set to an initial value (noise or noise level that does not give a sense of discomfort) (step S59), and on-screen display of outputting at the initial volume (step S60). . Next, the timer is reset (step S61), and it is determined whether or not there is a volume adjustment request (step S62). If there is no volume adjustment request from the user (No in step S62), and the timer is not 10 seconds (No in step S64), the initial volume is output for 10 seconds and the volume of the previous use in the on-screen display is output. Tells the user that it is outputting at a different initial volume.

In this case, the on-screen display displays a message indicating that the initial volume is output as shown in Fig. 6 (1), or outputs the volume adjustment value stored in the memory element 31 as shown in Fig. 6 (2). Display the character that counts down for 10 seconds. As a result, since the volume is not adjusted for 10 seconds after the power is turned on, even if the loud volume stored at the end of the period is output, the discomfort to the viewer can be reduced. If the volume is adjusted within 10 seconds after the power is turned on, the volume adjusted at that time is output and the volume adjustment value is displayed on-screen. In addition, the operation flowchart after step S38 is the same as that of embodiment mentioned above.

7 is an operation flowchart of the liquid crystal display device 100 of the fourth embodiment of the present invention. The program shown in this operation flowchart is stored in a storage medium such as a ROM built in the CPU 23 as in the above-described embodiment, and the CPU 23 outputs the remote control signal S10 output from the remote controller 22. In response to this, the timer is monitored and the volume adjustment circuit 33 is set.

This embodiment outputs the initial volume at the time of power supply, and after that, it is characterized by gradually increasing the volume until it becomes the volume at the time of power supply cutting | disconnection. That is, the CPU 23 sets the volume after the power is turned on to the initial value (step S72). This initial value is the amount of noise which does not give a silence or an unpleasant feeling like the case of 3rd Embodiment.

Next, the CPU 23 reads the volume adjustment value at the time of disconnection of the power stored in the storage element 31 (step S73). Then, it is judged whether or not there is a volume adjustment request from the user (step S74). If there is no volume adjustment request (No), a small volume is added to the initial volume (step S75), and the volume is slightly higher than the initial volume. Output

Next, it is judged whether or not the added volume value is equal to the volume adjustment value stored in the memory element 31 (step S76), and if not equal (No), the process returns to step S74. That is, if there is no volume adjustment request, the volume gradually approaches the volume adjustment value stored in the memory element 31 in the loop from step S74 to step S76, and when both become equal (Yes in step S76), Similarly, the routine proceeds to the routine for volume adjustment after step S38.

In this case, the time until the volume reaches the volume adjustment value stored in the storage element 31 is set long enough that the user can start the volume adjustment operation before the loud volume is reached, and gradually increases the volume. If there is a volume adjustment request from the user while the volume is gradually increased (Yes in step S74), the flow advances to step S39 at that point and enters the normal routine.

As described above, the liquid crystal display device 100 according to the present embodiment gradually increases until the volume becomes the volume at the time of cutting the power from the initial volume when there is no user's volume adjustment request for a predetermined period when the power is turned on. Therefore, the user can easily adjust the volume before the loud volume is output, so that there is a sufficient time margin before the volume becomes unpleasantly loud. In addition, since the volume gradually increases, it has the effect of prompting the user to adjust the volume. In this embodiment, on-screen display as in the third embodiment can be performed while the volume is gradually increased.

8 is an operation flowchart of the liquid crystal display device of the fifth embodiment of the present invention. The program shown in this operation flowchart is stored in a storage medium such as a ROM built in the CPU 23 as in the above-described embodiment, and the CPU 23 outputs the remote control signal S10 output from the remote controller 22. In response to this, the timer is monitored and the volume adjustment circuit 33 is set.

The liquid crystal display device 100 of the fifth embodiment has a function of outputting an initial volume when there is no volume adjustment request for 10 seconds after the power is turned on, as in the first or second embodiment, and whether the function is valid or invalid. It is characterized in that the user can select whether or not.

That is, when the function is enabled (Yes in step S84), the volume is set to an initial value as in the first or second embodiment (step S85), the timer is reset (step S86), and the volume adjustment from the user is adjusted. Waiting for a request (step S87). On the other hand, when the function is disabled (No in step S84), the flow advances to step S90 to set the volume adjustment value stored in the memory element 31 to the volume adjustment circuit 33 and output the volume. The operation flowchart after step S38 is the same as that of embodiment mentioned above.

Thus, in this embodiment, since whether the function which outputs the initial volume separate from the adjusted volume after the power supply is enabled can be selected, the use state at the time of presentation is the same as the last time, and it is necessary to adjust the volume. The operability in the absence can be improved. This function can be set by the operation switch of the remote controller 22 or the liquid crystal display device 100 or the like. In this embodiment, an on-screen display function as in the third embodiment or a function for gradually increasing the volume as in the fourth embodiment is set so that the user can select whether to enable or disable such a function. It may be.

Fig. 9 is an operation flowchart of the liquid crystal display device of the sixth embodiment of the present invention. The program shown in this operation flowchart is stored in a storage medium such as a ROM built in the CPU 23 as in the above-described embodiment, and the CPU 23 outputs the remote control signal S10 output from the remote controller 22. In response to this, the timer monitoring and the volume adjusting circuit 33 are set.

The sixth embodiment has a function of determining whether or not the volume adjustment value stored in the memory element 31 is a volume such that it does not cause discomfort to the viewer even if it is output as it is when power is turned on.

In the present embodiment, after the power is turned on, the CPU 23 reads the volume adjustment value stored in the storage element 31 (step S99). Next, it is judged whether or not this volume adjustment value is larger than a predetermined reference volume value (step S100), and when it is large, operation | movement similar to 1st Embodiment is performed after step S32.

On the other hand, when the volume adjustment value stored in the memory element 31 in step S100 is smaller than the reference volume value, the flow advances to step S37 to output the volume at the volume adjustment value stored in the memory element 31. Accordingly, if the stored volume adjustment value is not enough to cause discomfort to the viewer, it is output as it is after the power is turned on, and the operability at the time of presentation is improved, and if there is a risk of discomfort, the volume is zero for 10 seconds after the power is turned on. You can give the user some time to adjust the volume. The volume discrimination function of the present embodiment can also be applied to the second to fourth embodiments.

As described above, the display device of the present invention outputs sound at an initial value of a noise level separate from the adjustment value used last time when the power is turned on, and the user can easily adjust the volume for a predetermined period of time. At the same time as the input, the loud volume is output, thereby preventing the viewer from being offended.

Claims (6)

In the display device for storing the adjusted volume when the power supply is cut off, And a control circuit for controlling audio output at a predetermined initial volume after the power is turned on and outputting the audio at the stored volume after a predetermined period of time after the power is turned on. The method of claim 1, And the initial volume is zero volume. The method of claim 1, An on-screen display for displaying that no audio output is performed at said stored volume in said predetermined period. The method of claim 1, And outputting the voice by gradually increasing the volume from the initial volume to the stored volume in the predetermined period. The method of claim 1, And an operator can select whether to enable or disable the function of outputting audio at a predetermined initial volume after power-on and outputting audio at the stored volume after a predetermined period of time after power-on. The method of claim 1, If the stored volume is equal to or greater than a predetermined volume, audio is output at the initial volume for a predetermined period after the power is turned on. And when the stored volume is less than the predetermined volume, audio output is performed at the stored volume immediately after the power is turned on.