JP2006174047A - Television, video display device and video display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein it is not easy to grasp how effectively an energy saving processing is going on. <P>SOLUTION: A video display device is provided with: power saving settings in which power consumption at the time of displaying video images is suppressed compared to the case of normal setting and executes video display on the basis of prescribed video signals in the power saving setting. The device comprises: a power setting display means for displaying respective suppression degrees corresponding to the plurality of power saving settings in which the suppression degree of the power consumption is made different on an image display surface; a selection signal input means for inputting selection signals for selecting one of the power saving settings; and a power saving processing means for suppressing the power consumption so as to be the power consumption corresponding to the power saving setting selected by the inputted selection signals and executing the video display. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a television set, a video display device, and a video display method that have settings for suppressing power consumption more than usual.

  As a conventional technique, there is a method in which a display mode is selected from a first mode and a second mode that consumes less power than the first mode, and an image is displayed in one of the display modes according to a user's selection. (For example, refer to Patent Document 1).

As another conventional technique, there is known a display device that enables selection of a power saving mode for each resolution with respect to video input signals having different resolutions (see, for example, Patent Document 2).
JP 2004-46125 A JP-A-11-143443

  When the user sets the energy saving mode for suppressing power consumption when watching television, the user may want to know how much power consumption is suppressed as compared with the case where the energy saving mode is not set. However, in the prior art, although it is possible to set the energy saving mode, it is unclear to the user how much power consumption is actually suppressed by the setting, and it is difficult to understand the effect of the power saving setting. There was a problem. In addition, although the degree of power consumption and the image quality of the video are closely related, the energy saving mode may be set in consideration of the clear relationship between the video image quality and the electrical cost required for viewing the video. could not.

  The present invention has been made in view of the above problems, and a television, a video display device, and a video display method capable of selecting an optimum power saving setting for viewing in consideration of the balance between viewing comfort and power consumption. The purpose is to provide.

  In order to achieve the above object, the invention of claim 2 is provided with a power saving setting that suppresses power consumption when performing video display as compared with a normal setting, and based on a predetermined video signal in the power saving setting. In a video display apparatus capable of executing video display, a power setting display means for displaying each degree of suppression corresponding to a plurality of power saving settings with different levels of power consumption suppression on the image display surface; Selection signal input means for inputting a selection signal for selecting a power setting, and power saving for executing video display while suppressing power consumption so as to achieve power consumption according to the power saving setting selected by the input selection signal. And a processing means.

In the second aspect configured as described above, the power setting display means displays on the image display surface each suppression degree corresponding to a plurality of power saving settings with different power consumption suppression degrees. By viewing the display, the user can select one of the plurality of power saving settings that is considered to have the most optimal degree of power consumption suppression during viewing at that time. The selection signal input means inputs a selection signal for selecting one of the power saving settings based on a predetermined operation by the user. Then, the power saving processing means executes video display in a state where the power consumption is suppressed so that the power consumption according to the power saving setting selected by the input selection signal is obtained.
As described above, according to the present invention, the user can select a setting having a preferred degree of suppression of power consumption from a plurality of power saving settings. As a result, the video is displayed so that the power consumption according to the selected power saving setting is achieved, so that the user can clearly recognize how much power has been reduced and view the video. Can do.

According to a third aspect of the present invention, in the video display device according to the second aspect, the power setting display means displays an OSD screen that indicates each degree of suppression corresponding to a plurality of power saving settings in numerals.
In other words, the video display device has an OSD (On Screen Display) function, and displays the OSD screen that indicates each degree of suppression corresponding to a plurality of power saving settings on the image display surface by the function. The numbers indicating the degree of suppression here may be displayed as 80%, 60%, etc., assuming that the power consumption in a normal setting is 100%. In this way, by clearly indicating each degree of suppression by a number, the user can clearly recognize the energy saving effect rather than an ambiguous feeling such as high or low.

  According to a fourth aspect of the present invention, in the video display device according to the second or third aspect, the power saving processing unit suppresses the gain of the video signal so that the luminance of the video does not exceed a predetermined upper limit. Power corresponding to the power saving setting selected by the selection signal by executing either one of the processing to disable the image quality enhancement function for improving the image quality of the video, or combining both processing. This is a configuration for suppressing consumption.

  Examples of methods for suppressing power consumption include a process for suppressing the gain of the video signal so that the luminance of the video does not exceed a predetermined upper limit, and a process for disabling the image quality enhancement function for improving the image quality of the video. Conceivable. In other words, the power consumption can be reduced by suppressing the gain of the video signal so that the brightness of the video does not exceed the predetermined upper limit, and the same function can be executed if the image quality enhancement function that improves the image quality of the video is disabled. Power consumption can be reduced compared with the case. Therefore, the power saving processing unit executes either one of the two processes or suppresses power consumption according to the selected power saving setting by combining both processes. If both of the above processes are executed, the image quality is degraded. However, the user can select an optimum power saving setting in consideration of a balance between a desired power cost and an acceptable image quality.

  According to a fifth aspect of the present invention, in the video display device according to the fourth aspect, the power saving processing means acquires an ACL voltage value that changes in accordance with a change in luminance of the image display surface, and the ACL voltage value is a predetermined value. When the threshold value is exceeded, ACL control that suppresses the gain of the video signal so that the amplitude of the video signal falls within a predetermined range can be executed, and the value corresponding to the power saving setting with a high degree of power consumption suppression. By having a plurality of threshold values corresponding to each power saving setting specified to be low, and branching the execution or non-execution of ACL control using the threshold value corresponding to the power saving setting applied to the selection signal The power consumption is suppressed.

  The processing for suppressing the gain of the video signal so that the luminance of the video does not exceed a predetermined upper limit. In claim 5, the ACL voltage value that changes in accordance with the luminance change of the image display surface exceeds a predetermined threshold value. Is realized by ACL control that suppresses the gain of the video signal so that the amplitude of the video signal falls within a predetermined range. In this case, the power saving processing means has in advance a plurality of threshold values that are defined such that the value corresponding to the power saving setting with a high degree of power consumption suppression is lower. A threshold value corresponding to the power saving setting applied to the selection signal is read, and the read threshold value and the ACL voltage are compared to branch whether to execute the ACL control. As a result, as the power saving setting with a higher degree of power consumption suppression is selected, the gain of the video signal is suppressed from the stage where the brightness of the image display surface is low. Consumption can be suppressed.

  According to a sixth aspect of the present invention, in the video display device according to the fourth or fifth aspect, the power saving processing unit modulates the scanning speed of the electron beam irradiated on the image display surface to thereby display the video. If the selection signal selects a power saving setting in which the degree of suppression of power consumption is higher than a predetermined degree of suppression, the image quality enhancement function can be used. The power consumption is suppressed as impossible.

  As an image quality enhancement function for improving the image quality of an image, an image quality enhancement function for emphasizing the outline of the image by modulating the scanning speed of the electron beam irradiated on the image display surface can be considered as an example. Then, when the input selection signal selects a power saving setting in which the degree of suppression of power consumption is higher than the predetermined degree of suppression, the image quality enhancement function is disabled. As a result, although the image quality is lowered, the power consumption can be suppressed by the amount that the high image quality function is not functioned.

So far, the technical idea according to the present invention has been described as the invention of the apparatus, but the technical idea can also be grasped as a method for executing the technical idea. Therefore, the invention of claim 7 is provided with a power saving setting that suppresses the power consumption at the time of video display as compared with the normal setting, and the video is displayed based on a predetermined video signal in the power saving setting. In the display method, a power setting display step for displaying each suppression degree corresponding to a plurality of power saving settings with different power consumption suppression levels on the image display surface, and a selection signal for selecting one of the power saving settings One of the selection signal input process, the process of suppressing the gain of the video signal so that the luminance of the video does not exceed a predetermined upper limit, and the process of disabling the image quality enhancement function for improving the image quality of the video Or a combination of both processes, and a power saving process step of executing video display while suppressing power consumption so as to achieve power consumption according to the power saving setting selected by the selection signal. That it is constituted.
In other words, the invention of the method has the same effect as described above, and is established as a useful invention.

Based on the above configuration, the invention of claim 1 includes a power saving setting that suppresses power consumption when performing video display as compared to a case where the normal setting is set, and a predetermined video signal is set in the power saving setting. OSD display means for displaying, on the image display surface, an OSD screen indicating numerically each degree of suppression corresponding to a plurality of power saving settings with different degrees of suppression of power consumption in a television capable of executing video display based on And a selection signal input means for inputting a selection signal for selecting one of the power saving settings, and an ACL voltage value that changes in accordance with a change in luminance on the image display surface, and the ACL voltage value is a predetermined threshold value When the value exceeds the value, ACL control for suppressing the gain of the video signal can be executed so that the amplitude of the video signal falls within a predetermined range, and the value corresponding to the power saving setting with a high degree of power consumption suppression is lower. ACL control means for comparing with the ACL voltage using a threshold value corresponding to the power-saving setting applied to the input selection signal, and having a plurality of threshold values corresponding to each power-saving setting defined as described above The image quality can be enhanced by modulating the scanning speed of the electron beam applied to the image display surface, and the input selection signal has a predetermined degree of power consumption suppression. In the case of selecting a higher power saving setting, the image quality processing control means for stopping the image quality enhancement processing is provided.
Needless to say, in such a more specific configuration, the same effects as the inventions of claims 2 to 6 described above can be obtained.

  As described above, according to the present invention, by selecting the power saving setting of the degree of suppression of power consumption desired by the user, the power consumption corresponding to the selected power saving setting and the video display with the image quality are realized. . When viewing a predetermined video, the user can easily select a balance between the reduction in power cost desired by the user and the image quality level. Further, since the degree of suppression in each power saving setting is clearly shown on the screen, the user can clearly recognize how much electric cost reduction is achieved.

(1) Schematic Configuration of Television FIG. 1 is a schematic block diagram of a configuration of a television 100 according to an embodiment of the present invention. Note that an operation panel, a remote controller and the like used by the user are not shown.
In the figure, a television 100 generally includes a tuner IC 10, a chroma IC 20 connected to the tuner IC 10, and a microcomputer 30 connected to the tuner IC 10 and the chroma IC 20 as broadcast receivers. The tuner IC 10, chroma IC 20 and microcomputer 30 are connected to the IIC bus 90. In the microcomputer 30, the CPU 31 executes processing by a predetermined program stored in the ROM 32 using the RAM 33 as a work area, and controls the entire television 100 by serial data communication.

  The tuner IC 10 is a frequency synthesizer type tuner, receives a broadcast wave of television broadcasting under the control of the microcomputer 30, converts it into an intermediate frequency signal (IF), and outputs it. The tuner IC 10 includes an antenna 10 a, a high frequency amplifier circuit connected to the microcomputer 30, an intermediate frequency signal output circuit connected to the high frequency amplifier circuit and the microcomputer 30, and the like. The intermediate frequency signal output circuit includes a local oscillation circuit connected to the microcomputer 30 and a mixing circuit connected to the local oscillation circuit and the high frequency amplification circuit. Note that various types of circuits for television that have been conventionally used can be applied to these circuits.

  The high-frequency amplifier circuit has a band-pass filter. Based on the control of the microcomputer 30, the radio wave corresponding to the desired frequency is received from the antenna 10a via the band-pass filter and amplified to create a high-frequency signal. Then, the generated high-frequency signal is output to the mixing circuit. The local oscillation circuit is configured by a PLL (Phase Locked Loop) circuit, and a local oscillation signal having a local oscillation frequency corresponding to a desired frequency of the broadcast radio wave is generated by the PLL circuit with reference to a reference oscillation signal from the crystal oscillation circuit. Create and output to mixing circuit. The mixing circuit mixes the output from the high frequency amplifier circuit and the local oscillation signal from the local oscillation circuit, converts the mixed signal into an intermediate frequency signal, and outputs it to the chroma IC 20.

  The chroma IC 20 includes an intermediate frequency amplification (VIF) circuit connected to the tuner IC 10, a VCO (Voltage Controlled Oscillator) circuit connected to the microcomputer 30, a detection circuit connected to the VCO circuit and the VIF circuit, and a detection circuit. A connected AGC circuit, a synchronous circuit connected to the detection circuit, and the like are provided. Note that various circuits for television that have been conventionally used can be applied to each circuit.

  The VIF circuit amplifies the intermediate frequency signal input from the tuner IC 10 to an intermediate frequency, and outputs the intermediate frequency signal amplified by the intermediate frequency to the detection circuit. The VCO circuit can change the oscillation frequency of the oscillation signal that oscillates according to the voltage input from the microcomputer 30, and oscillates the oscillation signal at an oscillation frequency corresponding to the voltage. The detection circuit detects the intermediate frequency signal amplified by the VIF circuit based on the oscillation frequency of the oscillation signal, and outputs a video signal and an AUDIO signal. More specifically, the detection circuit separates the video signal by performing video detection in synchronization with the oscillation frequency of the oscillation signal from the intermediate frequency signal amplified by the intermediate frequency. Further, a luminance signal (Y signal), a carrier color signal (C signal), a horizontal / vertical synchronization signal (SYNC), and the like included in the video signal are separated. The separated color signal is subjected to a predetermined color demodulation process to separate the RGB signals and output to the outside. As for the audio signal, the audio component and the oscillation signal of the intermediate frequency amplified intermediate frequency signal are mixed to create a second audio intermediate frequency signal, and FM detection is performed to produce an AUDIO signal, which is output to the outside. To do.

  The RGB signals output from the detection circuit are output to the cathode amplifier 50, amplified by the cathode amplifier 50, and supplied to the picture tube (CRT) 80. Then, the picture tube 80 performs screen display based on the amplified RGB signals. On the other hand, the AUDIO signal is output to an audio amplifier (not shown), amplified by the audio amplifier, and supplied to a speaker (not shown). The speaker outputs sound based on the amplified AUDIO signal.

  The synchronization circuit creates a sawtooth horizontal / vertical drive signal (DRIVE) based on the input horizontal / vertical synchronization signal, and outputs it to the horizontal deflection circuit 60 and the vertical deflection circuit 70. The horizontal deflection circuit 60 and the vertical deflection circuit 70 generate a predetermined horizontal drive current and vertical drive current corresponding to the horizontal drive signal and the vertical drive signal, and a horizontal deflection coil 80a and a vertical deflection coil 80b attached to the picture tube 80. By supplying to each of these, the electron beam is driven in the horizontal and vertical directions. The high-frequency signal generated in the horizontal deflection circuit 60 is supplied to a flyback transformer (FBT) 62, and high voltage HV supplied to the anode electrode of the picture tube 80 is generated. As a result, the electron beam corresponding to the RGB signals is emitted from the picture tube 80 while being driven, and an image appears on the tube surface of the picture tube 80.

  In an ACL (Auto Contrast Limit) circuit 63, a change in voltage based on the luminance of the tube surface of the picture tube 80 is acquired from the FBT 62 as an ACL voltage, and the ACL voltage is input to the chroma IC 20. The chroma IC 20 suppresses the signal level of the RGB signal output to the cathode amplifier 50 based on the comparison result between the predetermined threshold Th and the ACL voltage so that the luminance of the tube surface of the picture tube 80 does not exceed the predetermined value. (Hereinafter also referred to as ACL control). As a result, the brightness of the tube surface is prevented from becoming excessive, and the consumed power is also suppressed.

The speed modulation (VM) circuit 40 corresponds to the image quality enhancement function described in the claims.
FIG. 2 shows a process flow in the VM circuit 40 by a block diagram or the like. The VM circuit 40 includes a differentiation circuit 41, a VM drive circuit 42, and a VM coil 43. First, in the differentiation circuit 41, the luminance signal Y included in the video signal is input from the chroma IC 20, and the luminance signal Y is first-order differentiated to generate a VM modulation signal. In the figure, the luminance signal Y is illustrated in (a), and the VM modulation signal is illustrated in (b). Next, the VM drive circuit 42 generates and outputs a VM drive current based on the VM modulation signal. In the figure, the VM drive current is illustrated in (c).

  The VM drive current generated as described above is supplied to a VM coil 43 provided at a predetermined position around the electron gun in the picture tube 80. As a result, the horizontal movement of the electron beam emitted from the electron gun is changed by the magnetic field generated by the VM drive current. That is, by supplying the VM drive current to the VM coil 43, the scanning speed of the electron beam in the horizontal direction is locally changed as shown in FIG. In the case of the figure, since the scanning speed increases in the first half of the process in which the luminance changes from Y1 to Y2, and the scanning speed decreases in the second half, the luminance change on the picture tube 80 becomes steep. As a result, the outline of the video is emphasized and the image quality is further improved. Even if the VM circuit 40 does not exist, the video display based on the broadcast signal is realized in the television 100, but the video quality is improved by using the circuit together.

  The microcomputer 30 also includes an OSD circuit 34 and a remote control I / F 35. The OSD circuit 34 can superimpose still images such as other characters and characters on the video based on the video signal. That is, the OSD circuit 34 can generate a predetermined OSD display signal for performing OSD display, and can output the OSD display signal to the chroma IC 20 after superimposing the OSD display signal on the video signal input from the chroma IC 20. The remote control I / F 35 can input an infrared blink signal output from a remote control transmitter as an external device. The infrared blinking signal is sent to the CPU 31, and the CPU 31 executes a corresponding control process.

(2) Description of Power Saving Processing With the above-described configuration, the television 100 performs video display based on the received broadcast radio waves, but the user desires to reduce power consumption (energy saving) during video display. There is a case. Therefore, in the present embodiment, a plurality of energy saving modes for realizing different levels of power consumption suppression are prepared, and the user can freely select one of the energy saving modes.

  FIG. 3 shows an example of a power consumption setting screen displayed when the energy saving mode is selected. The user sends a signal instructing to display the power consumption setting screen 110 on the picture tube 80 by a predetermined remote control operation, and the microcomputer 30 receives the signal via the remote control I / F 35. Then, the microcomputer 30 outputs a predetermined control signal to the OSD circuit 34. Based on the control signal, the OSD circuit 34 executes a process of displaying a power consumption setting screen 110 as shown in FIG. Image data for displaying the power consumption setting screen 110 is stored in advance in the ROM 32 or the like.

On the power consumption setting screen 110 displayed in this way, the degree of power consumed when displaying video is clearly indicated by a number for each mode. In this embodiment, the normal mode and the energy saving modes 1 to 3 exist, and as the energy saving modes 1, 2, and 3 are entered (as the level of the energy saving mode increases), the degree of suppression of power consumption increases. . Here, the normal mode is a setting state that consumes the most power when viewing images on the television 100, and the normal mode is an initial setting in the television 100. In the setting screen 110, when the electric power consumed in the normal mode is 100%, the electric energy consumed in each of the energy saving modes 1 to 3 is a number such as 80, 50, and 30%. It is specified in.
The user views the setting screen 110, selects a desired energy saving mode, and sends an energy saving mode selection signal for designating the selected energy saving mode by a predetermined remote control operation.

FIG. 4 shows a flowchart for executing the energy saving process corresponding to the selected energy saving mode.
In step S (hereinafter step description is omitted) 200, the microcomputer 30 determines whether or not the energy saving mode selection signal is input via the remote control I / F 35. If it is determined that the energy saving mode selection signal has been input, the process proceeds to S220 and thereafter.

  In S220, the microcomputer 30 acquires the threshold value Th used for comparison with the ACL voltage and corresponding to the energy saving mode specified by the input energy saving mode selection signal. The threshold values Th1 to Th3 corresponding to each of the energy saving modes 1 to 3 are set in advance so as to be smaller as the energy saving mode level is higher (Th1> Th2> Th3), and are stored in the ROM 32 or the like. A method for setting the threshold values Th1 to Th3 will be described later. The microcomputer 30 reads any threshold value Th from the ROM 32 or the like as appropriate based on the energy saving mode selection signal.

In S240, the read threshold value Th is compared with the ACL voltage (which may be an average value of the ACL voltage acquired within a predetermined period) input from the ACL circuit 63, and the ACL is determined based on the comparison result. Execute control. Here, the anode current flowing through the picture tube 80 changes in accordance with a change in luminance of the screen, and the ACL circuit 63 acquires the change in the anode current from the FBT 62, and the magnitude of the ACL voltage increases in accordance with the change. It is determined. In the present embodiment, the ACL voltage takes a large value when the screen at that time is bright, and takes a small value when the screen is dark.
On the other hand, in the chroma IC 20, when the ACL voltage is larger than the threshold value Th, the maximum luminance level in the video signal becomes a predetermined value by lowering the amplification factor at the intermediate amplification stage for the video signal (RGB signal). Control is performed so as not to exceed (contrast is within a predetermined range), and such control is not performed when the ACL voltage is smaller than the threshold value Th.

  Therefore, as the threshold value Th read in S220 is smaller, in other words, as the selected energy saving mode level is higher, processing for suppressing the gain of the video signal in a state where the screen brightness is not high is executed. The maximum luminance level of the screen is suppressed as compared with the normal mode, and the power consumption is suppressed. Since the power consumed when displaying the video is increased as the screen is brighter, the power consumption can be effectively suppressed by such processing.

FIG. 5 simply shows how the maximum luminance level of the video signal is suppressed for each mode.
In the figure, the horizontal axis indicates the magnitude of the ACL voltage, and the vertical axis indicates the maximum luminance level of the video signal that is input to the cathode amplifier 50 under the ACL control. In the figure, the line corresponding to the display of “0” corresponds to the case where the normal mode is selected, and the lines corresponding to the displays of 1 to 3 are respectively selected when the energy saving modes 1 to 3 are selected. It corresponds. In other words, while the ACL voltage does not exceed a certain threshold value, the processing for suppressing the maximum level of the video signal input to the cathode amplifier 50 is not executed, but when the ACL voltage exceeds a certain threshold value, the same processing is not performed. Processing is performed to suppress the gain of the video signal so that the maximum level does not exceed a predetermined value. As a result, the maximum luminance level of the video signal input to the cathode amplifier 50 rises to a certain value, but is prevented from exceeding a predetermined value (any one of V0 to V3).
And when the energy saving modes 1 to 3 are selected instead of the normal mode, the process of suppressing the gain of the video signal so that the maximum level does not exceed the predetermined value is executed from the stage where the ACL voltage is low. The higher the energy saving mode level, the lower the maximum level is maintained.

The energy saving process that can be executed in the present embodiment is not limited to the method based on the change of the ACL control execution condition.
In S260, the microcomputer 30 determines whether or not the level of the energy saving mode specified by the energy saving mode selection signal is equal to or higher than a predetermined level. If the level is equal to or higher than the predetermined level, “Yes” is determined and the process proceeds to S280.
In S280, the microcomputer 30 turns off the output of the luminance signal from the chroma IC 20 to the VM circuit 40, and does not perform the above-described image quality improvement process using the VM circuit 40. As a result, although the image quality is reduced as compared with the case where the VM circuit 40 is used (ON), the power consumption is reduced, so that the power consumption can be suppressed according to the level of the selected energy saving mode.

  On the other hand, if the level of the energy saving mode specified by the energy saving mode selection signal is less than the predetermined level in S260, the process of S280 is not performed. In this case, the energy saving process is only the process in S240, and the image quality improvement process using the VM circuit 40 is executed as usual. A switching circuit (not shown) may be provided between the chroma IC 20 and the VM circuit 40, and the microcomputer 30 may turn off the switching circuit based on the determination in S260.

  In step S200, when any energy saving mode selection signal is not input and a predetermined selection signal for designating the normal mode is input, the processing of S220 to S280 is not performed. In this case, during the video display process, the television 100 executes the image quality enhancement process by the VM circuit 40, and the determination of whether or not to execute the ACL control is a value larger than any of the threshold values Th1 to Th3. Is branched based on a comparison between Th0 and the ACL voltage.

Here, the threshold values Th1 to Th3 and the level of the energy saving mode for branching on / off of the image quality improvement processing can be determined as follows.
First, the television 100 is caused to execute video display based on a video signal for a predetermined test for a predetermined time in the normal mode (image quality enhancement processing is ON and threshold value Th0), and the power consumed during this time is measured. To do.
Next, the process of measuring the power by executing the video display based on the video signal for the test for a predetermined time by various combinations of the threshold value and the on / off of the image quality enhancement process is repeated. As a result, when the power consumed in the normal mode is 100%, the threshold values when the power consumption is 80, 50, and 30% (however, the selection of these numbers is arbitrary) are respectively used. And on / off combination of high image quality processing.

  FIG. 6 shows an example of a combination of the threshold value thus obtained and on / off of the image quality improvement processing. According to the figure, in the energy saving mode 1 in which the power consumption is 80%, the threshold value is Th1, and the image quality improvement process is executed. In the energy saving mode 2 in which the power consumption is 50%, the threshold value is Th2, and the image quality enhancement processing is not executed. In the energy saving mode 3 in which the power consumption is 30%, the threshold value is Th3, The image quality improvement process is not executed. However, depending on the degree of suppression of power consumption, a combination in which the threshold value remains Th0 and only the high image quality processing is turned off is also conceivable.

(3) Summary As described above, according to the present invention, by preparing a plurality of threshold values, which are ACL control conditions, and turning on / off the VM circuit 40, video can be displayed in accordance with various power-saving setting levels. It is possible to suppress the power consumed when viewing. Further, the user can clearly recognize the energy saving effect by each energy saving mode as a number by looking at the power consumption setting screen 110. Furthermore, the user can achieve both viewing comfort and power cost reduction by selecting an energy saving mode in which the balance between the energy saving effect and the desired image quality level during viewing is selected.

It is a schematic block diagram of the television concerning one Embodiment of this invention. It is the block diagram which showed the detail of VM circuit. It is the figure which showed the power consumption setting screen. It is the flowchart which showed the processing content of the energy saving process. It is the figure which showed the change aspect of the maximum luminance level of a video signal. It is the figure which showed the combination of the threshold value in each mode, and ON / OFF of the image quality improvement process.

Explanation of symbols

10 ... Tuner IC
20 ... Chroma IC
30 ... Microcomputer 31 ... CPU
32 ... ROM
33 ... RAM
34 ... OSD circuit 35 ... Remote control I / F
40 ... VM circuit 50 ... Cathode amplifier 62 ... FBT
63 ... ACL circuit 80 ... Picture tube 100 ... Television 110 ... Power consumption setting screen

Claims (7)

In a television that has a power saving setting that suppresses power consumption when performing video display compared to a normal setting, and that can perform video display based on a predetermined video signal in the power saving setting,
OSD display means for displaying, on the image display surface, an OSD screen that indicates each degree of suppression corresponding to a plurality of power saving settings with different levels of suppression of power consumption;
A selection signal input means for inputting a selection signal for selecting any one of the power saving settings;
An ACL voltage value that changes according to a change in luminance on the image display surface is acquired, and when the ACL voltage value exceeds a predetermined threshold value, the gain of the video signal is adjusted so that the amplitude of the video signal is within a predetermined range. It has a plurality of threshold values corresponding to each power saving setting that can be executed, and a value corresponding to a power saving setting with a high degree of power consumption suppression, and the above-described input ACL control means for comparing with the ACL voltage using a threshold value corresponding to the power saving setting applied to the selection signal;
The image quality can be enhanced by modulating the scanning speed of the electron beam applied to the image display surface, and the input selection signal has a predetermined degree of power consumption suppression. A television comprising: high image quality processing control means for stopping the image quality enhancement processing when a higher power saving setting is selected. In a video display device having a power saving setting that suppresses power consumption when performing video display compared to a normal setting, and capable of executing video display based on a predetermined video signal in the power saving setting,
Power setting display means for displaying on the image display surface each suppression degree corresponding to a plurality of power saving settings with different power consumption suppression degrees;
A selection signal input means for inputting a selection signal for selecting any one of the power saving settings;
A video display apparatus comprising: a power saving processing unit configured to execute video display while suppressing power consumption so that power consumption corresponding to a power saving setting selected by the input selection signal is obtained.   3. The video display apparatus according to claim 2, wherein the power setting display means displays an OSD screen that indicates each degree of suppression corresponding to a plurality of power saving settings by a number.   The power saving processing means performs either one of processing for suppressing the gain of the video signal so that the luminance of the video does not exceed a predetermined upper limit, and processing for disabling the image quality enhancement function for improving the video image quality. 4. The video display according to claim 2, wherein power consumption is suppressed according to a power saving setting selected by the selection signal by executing or combining both processes. 5. apparatus.   The power saving processing means acquires an ACL voltage value that changes in accordance with a change in luminance of the image display surface, and when the ACL voltage value exceeds a predetermined threshold, the amplitude of the video signal is within a predetermined range. As described above, a plurality of threshold values corresponding to each power saving setting are defined such that a value corresponding to a power saving setting with a high degree of power consumption suppression can be performed. 5. The video display according to claim 4, wherein power consumption is suppressed by branching between execution and non-execution of ACL control using a threshold value corresponding to a power saving setting applied to the selection signal. apparatus.   The power saving processing means can execute an image quality enhancement function that emphasizes an outline of an image by modulating a scanning speed of an electron beam irradiated on an image display surface, and the selection signal has a degree of suppression of power consumption. The power consumption is suppressed by disabling the image quality enhancement function when the power saving setting higher than a predetermined suppression degree is selected. Video display device. In a video display method for displaying video based on a predetermined video signal with a power saving setting that suppresses power consumption when performing video display compared to a normal setting,
A power setting display step for displaying each degree of suppression corresponding to a plurality of power saving settings with different levels of suppression of power consumption on the image display surface;
A selection signal input step of inputting a selection signal for selecting any one of the power saving settings;
Execute either one of the processing to suppress the gain of the video signal so that the luminance of the video does not exceed the predetermined upper limit, the processing to disable the image quality enhancement function to improve the image quality of the video, or both processing A video display method comprising: a power saving processing step of performing video display while suppressing power consumption so that power consumption is set according to a power saving setting selected by the selection signal by combining the selection signals.

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