JP2005210706A - Display device, television receiver, image display control method and image display control processing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which can significantly enhance the battery service time, while ensuring a backlight which is bright and easily to see, and is suitable for a mobile purpose, and to provide a television receiver, an image display control method and an image display control processing program. <P>SOLUTION: The device is provided with a broadcast content detecting unit 165 for detecting an EPG contained in program adding information; an operating unit 166 for allowing the user to set a program to be viewed or backlight control mode; and a display control unit 167 for controlling at least any one of the backlight luminance, spatial resolution of liquid crystal drive, and temporal resolution, on the basis of a viewing reservation program which has been set. The unit 167 controls the luminance of the backlight 110 of a liquid crystal panel 100 or the liquid crystal drive of the liquid crystal panel 100, on the basis of viewing reservation program which has been set. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device, a television receiver, an image display control method, and an image display control program, and more particularly, to an energy saving effect (hereinafter referred to as energy saving) and display characteristic improvement of the display device.

  Hereinafter, in the description of the specification, display characteristics include at least one of display brightness, spatial resolution, and temporal resolution. The definition of the reference level is a default value, generally a display brightness that is acceptable to the user. The reservation status includes the reservation time of the viewing reservation program and the total time of the reserved programs.

  2. Description of the Related Art Conventionally, liquid crystal display devices are roughly classified into a transmission type that displays an image by controlling the transmitted light amount of light irradiated from the outside, and a reflective type that displays an image by controlling the reflected light amount. A transmissive liquid crystal display device generally uses an illumination device called a backlight on the back surface. The backlight is connected to a backlight drive circuit, and necessary drive power created based on a commercial power source or a power source such as a battery is supplied through the drive circuit. Reflective liquid crystal display devices can display using ambient light, but the display brightness is very dependent on the surrounding environment, and the display cannot be recognized at all in the dark, especially at night. There is also. For this reason, an illumination device called a front light that illuminates the reflective liquid crystal display element from the front is provided in the case where sufficient ambient light cannot be obtained, and there is also a device that is similarly turned on using a drive circuit.

  Such a drive circuit includes an inverter circuit, generates a pulse lighting signal having a cycle of about 100 to 400 Hz based on driving power supplied from a power source, and inverts the inverter during a period when the pulse signal is at a high level. The circuit is driven to generate a high frequency voltage having a period of 40 K to 200 KHz. Thereafter, the high-frequency voltage is applied to the backlight and driven.

  In addition, a portable display device typified by a portable television receiver is battery-powered when being portable. In the portable display device, the power consumed by the backlight unit is the largest, and the battery driving time varies greatly depending on whether the backlight is turned on or off and its brightness. Generally, the display screen is easy to see when the luminance of the backlight is high, and difficult to see when the luminance is low. Since the use of the backlight greatly affects the battery driving time, the backlight luminance is controlled to extend the battery driving time. For example, Patent Document 1 discloses a personal computer that calculates current consumption from a set battery driving time and the total battery capacity, and drives the backlight only during the time set by the user.

  Patent Document 2 discloses an apparatus that controls the lighting time of a device in accordance with the remaining battery capacity. Patent Document 3 discloses a portable viewing device that switches the backlight to low power driving when the remaining battery level is below a certain level, and turns off the video and switches to memory card recording when the battery level drops further.

Japanese Patent Laid-Open No. 4-192015 JP-A-7-327004 Japanese Patent Laid-Open No. 11-122937

  However, in such a conventional portable display device, the backlight brightness and the operation of the device are only partially limited according to the remaining battery level, and the backlight that is optimal for the time that the user wants to watch is used. The brightness of was not ensured.

  For example, in a portable television receiver, when the backlight is dimmed during the program time that the user really wants to watch or when the remaining battery level is sufficient, the time when the user does not watch with much interest or the backlight of the program Is high brightness. These are not effective use of the backlight. In the former case, the user's feeling of use is impaired, and in the latter case, the battery is consumed and the battery driving time is reduced.

  The present invention has been made in view of such problems, and a display device, a television receiver, an image display control method, and an image display control capable of ensuring backlight brightness that is bright and easy for a user to view a viewing program. An object is to provide a processing program.

  It is another object of the present invention to provide a display device, a television receiver, an image display control method, and an image display control processing program capable of reducing power consumption.

  A display device according to the present invention is a display device that includes a liquid crystal panel and an illumination light source unit that illuminates the liquid crystal panel, and includes electronic program guide acquisition means for acquiring an electronic program guide, and viewing based on the acquired electronic program guide. A viewing program reservation unit for reserving a program and an image display control unit for controlling display characteristics of the liquid crystal panel or the illumination light source unit based on a reservation status related to the reserved viewing reservation program are provided.

  A display device according to the present invention is a display device that includes a liquid crystal panel and an illumination light source unit that illuminates the liquid crystal panel, and includes electronic program guide acquisition means for acquiring an electronic program guide, and viewing based on the acquired electronic program guide. Viewing program reservation means for reserving a program, and based on at least one of display brightness of the liquid crystal panel, spatial resolution of the liquid crystal panel, or time resolution based on a reservation status regarding the reserved viewing reserved program An image display control means for controlling display characteristics is provided.

  As a specific aspect, the control of the brightness of the display on the liquid crystal panel includes a control for changing the luminance of the illumination light source unit according to the reservation status.

  As a specific aspect, the control of the spatial resolution includes control for changing the size of an image to be displayed on the liquid crystal panel according to the reservation status.

  As a specific aspect, the control of the temporal resolution includes control for changing the frame frequency of the liquid crystal panel according to the reservation status.

  The image display control means may perform partial lighting or extinguishing of the illumination light source unit according to the reservation status.

  The display device of the present invention further includes a battery for driving the display device, and a battery remaining amount detecting unit for detecting a remaining capacity of the battery, wherein the image display control unit is configured to detect the reservation status and the detected battery. The image display control is performed based on the remaining capacity.

  As a specific aspect, the reservation status includes a reservation time of a viewing reservation program or a total time of reserved programs.

  As a more preferred specific mode, the image display control means performs control for maintaining the display characteristics at a reference level within the broadcast time of the reserved viewing reservation program.

  As a more preferred specific aspect, the image display control means performs control for raising the display characteristic above a reference level within the broadcast time of the reserved viewing reservation program.

  As a more preferred specific aspect, the image display control means performs control for lowering the display characteristics below a reference level for programs other than the reserved reserved program for viewing.

  Furthermore, priority order setting means for setting a priority order for the reserved viewing reservation program may be provided, and the image display control means may perform image display control according to the set priority order.

  A television receiver according to the present invention includes any one of the display devices described above.

  A display device control method according to the present invention is a display device control method including a liquid crystal panel and an illumination light source unit that illuminates the liquid crystal panel, and includes a step of acquiring an electronic program guide, and the acquired electronic program guide. And a step of reserving a viewing program, and a step of controlling at least one of display brightness, display spatial resolution, and temporal resolution based on a reservation status related to the reserved viewing reservation program. It is said.

  From another viewpoint, the present invention is a program for causing a computer to execute the steps of the display device control method.

  As described above in detail, according to the present invention, when a portable display device equipped with a battery with a limited capacity is used, in a method of properly using a display device when a user really wants to see it or not, An efficient selection method can be proposed. In addition, it is possible to secure a bright and easy-to-see backlight for the user regarding the viewing program. Furthermore, when viewing a program that is not so important to the user, it is possible to reduce the power consumption by suppressing the extra power consumption and not using the extra power. As a result, a display device, a television receiver, and an image display control method that are excellent in energy saving effects can be realized.

  In addition, it is possible to greatly extend the battery driving time while securing a bright and easy-to-see backlight for the user in the time zone where the user originally wants to view. As a result, a necessary minimum number of batteries can be prepared, and a user-friendly display device driving method can be provided.

Hereinafter, preferred embodiments of a display device, a television receiver, and an image display control method of the present invention will be described in detail with reference to the accompanying drawings.
First, the basic concept of the present invention will be described.

[Basic configuration]
1A and 1B are block diagrams illustrating the basic concept of the present invention.
In FIG. 1A, the display device of the present invention is
Program information acquisition means for acquiring program information a. When,
Viewing reservation program setting means for setting a viewing reservation program based on the acquired program information b. When,
Image display control means for controlling at least one of backlight (illumination light source) brightness, liquid crystal drive spatial resolution, and temporal resolution based on the set viewing reservation program; c. When,
Image display control means c. Control object controlled by d. The basic configuration is that
In FIG. 1B, the display device of the present invention is
Further, a battery remaining amount detecting means for detecting the remaining capacity of the battery e. Image display control means c. Performs image display control based on the detected remaining battery capacity.

[Control target]
The image display control includes backlight control and liquid crystal drive control. The backlight control includes changing the backlight brightness, turning on / off the backlight, and controlling partial lighting of the backlight. The liquid crystal drive control is control of spatial resolution for changing the image size and temporal resolution for changing the frame rate. Both are performed from the viewpoint of low power consumption while ensuring the user's viewability of the reserved viewing program. It is also possible to combine backlight control and liquid crystal drive control.

  In a liquid crystal panel of a liquid crystal display device, for example, a TFT (Thin film transistor) liquid crystal panel, a plurality of vertical selection lines are sequentially driven by a vertical scanning circuit, whereby a liquid crystal display element connected to these vertical selection lines ( Hereinafter, the liquid crystal cell is functioned. By driving one vertical selection line, one row of pixels can be displayed by a plurality of liquid crystal cells connected to the vertical selection line. By sequentially driving each vertical selection line, an image of one frame on the display panel is displayed.

  In such a liquid crystal driving circuit, each vertical selection line is driven from the ground potential GND to the driving voltage Vp for each horizontal period. That is, since each vertical selection line is charged from the ground potential GND to the drive voltage Vp, power is consumed accordingly.

For example, when the number of vertical selection lines of the liquid crystal panel is k, the capacity per vertical scanning line is Cs, the drive voltage is Vp, and the frame frequency is fv, the power consumption Pc for driving the vertical selection line of the liquid crystal panel is Is obtained by the following equation (1).
Pc = k · Cs · Vp ² · fv (1)

  As the liquid crystal display device is increased in panel size and resolution, the capacity per line is increased by increasing the length of the vertical selection lines, and the number of vertical selection lines is further increased, so that the power consumption Pc is increased. Furthermore, in a liquid crystal display device in which measures for increasing the frame frequency are taken in order to reduce flicker (flickering of the display screen), the power consumption Pc increases due to the increase in the frame frequency.

  The power consumption Pc in the liquid crystal panel is obtained by the above formula (1). In the spatial resolution change, the number k of vertical selection lines is reduced to display a low resolution or a small screen. In changing the temporal resolution, the frame frequency fv is lowered. Thereby, the power consumption Pc can be reduced.

[Control contents]
Image display control means c. Performs image display control based on the set viewing reservation program. The viewing reservation program is selected by the user based on the EPG, for example. Further, the battery remaining amount detecting means e. It is preferable to detect the remaining battery level by reflecting the remaining battery level information in the image display control.

  Image display control means c. Keeps the brightness of the backlight, spatial resolution, or temporal resolution for the set viewing reservation program. For this reason, the brightness, spatial resolution, or temporal resolution of the backlight is lowered for programs other than the viewing program. If the backlight is turned off, leave a sound.

  Image display control will be described by taking backlight control as an example. [Pattern 1] In the broadcast time zone of the reserved viewing program, the backlight luminance is increased, and the backlight luminance of the program in the time zone other than the reserved viewing program is kept at the reference level. Further, when the commercial is inserted in the program (hereinafter also referred to as CM), the backlight brightness is lowered. [Pattern 2] The brightness of the backlight is secured for the broadcast time zone of the viewing reservation program, and the brightness of the backlight other than the viewing reservation program is lowered. Further, during the CM, the backlight brightness is further lowered or turned off. The above pattern is an example, and various combinations of patterns and pattern contents are possible. Furthermore, backlight partial lighting control and liquid crystal drive control may be used alone or in combination with backlight luminance control.

  When there are a plurality of reserved viewing programs, priority can be given (user setting, prior setting priority, series priority). The main purpose of assigning priorities is to make it possible to first view high priority items in relation to mobile (remaining battery power). By estimating the priority, it is possible to estimate that what you watch every week, such as a series program, must be viewed. In this case, the user may not select.

First Embodiment FIG. 2 is a block diagram schematically showing a configuration of a display device according to a first embodiment of the present invention based on the basic concept of FIG. The display device according to this embodiment is applied to a display device of an AC-driven digital television receiver.

  In FIG. 2, the display device of the television receiver includes a liquid crystal panel 100 (control target) and a cold cathode tube (CCFT) as a light source for a backlight (illumination light source unit) that irradiates the liquid crystal panel 100 with light. A microcomputer (microcomputer) that performs backlight luminance control in accordance with a display control signal from a display controller 167 (image display control means) using a backlight 110 (to be controlled) composed of a tube) and a supply power supply voltage as basic parameters. 120, an AC adapter 130 that converts an external commercial power source into an appropriate DC power source and supplies the DC power source to the device, and a regulator 131 that rectifies the power source voltage supplied from the AC adapter 130 and outputs a predetermined DC voltage to the microcomputer 120 And a plurality of inverters 151 to 154, and the DC voltage is from several tens of kilohertz to several hundreds of kilohertz. Inverter circuit 150 that converts the frequency voltage to drive backlight 110, external input 160 including CATV, tuner 162 that receives a broadcast signal from antenna 161, and program supplementary information that is multiplexed with the received broadcast signal The program information separating unit 163 for separating the data, the decoding unit 164 for decoding the stream data, and the broadcast content detecting unit 165 for detecting the EPG (Electrical Program Guide) included in the program supplementary information (program information acquisition) Means) and an operation unit 166 (one of viewing reservation program setting means) including a key input unit, a pointing device, a remote control device and the like for inputting user operation information such as setting of a viewing reservation program, scheduled viewing time and backlight control mode setting. Process the decoded video signal and output it to the LCD controller 168. A display control unit 167 for controlling at least one of backlight luminance, liquid crystal drive spatial resolution, and time resolution based on the set viewing reservation program, display data, and a display data transfer clock, The LCD controller 168 supplies a liquid crystal drive signal such as a scan start signal and a display data latch signal, and a liquid crystal drive circuit 169 that outputs a drive voltage to the liquid crystal panel 100 by the liquid crystal drive signal.

  The microcomputer 120, the AC adapter 130, the regulator 131, and the inverter circuit 150 constitute a backlight lighting device 155 that lights the backlight 110 as a whole.

First, the backlight lighting device 155 will be described.
The backlight 110 includes a plurality of discharge lamps 111 to 114 as light sources for irradiating the liquid crystal panel 100 with light. Although FIG. 2 illustrates a configuration including four discharge lamps 111 to 114, the number and arrangement of the discharge lamps and inverters can be arbitrarily determined according to the dimensions of the liquid crystal panel.

  The microcomputer 120 includes a control unit 121 that performs backlight luminance control on each internal component and a device external to the microcomputer 120, and a dimming pulse generation circuit that supplies a dimming pulse to the inverter circuit 150 (backlight driving unit). 122 and PWM (Pulse Width Modulation) units 123 to 126 that modulate the pulse width and period of the dimming pulse generated by the dimming pulse generation circuit 122 and input the modulated pulse width and period to the inverter circuit 150.

  The dimming pulse generation circuit 122 includes a reference oscillator (not shown) that generates a reference oscillation clock, and generates a dimming pulse based on this clock. In the present embodiment, a plurality of dimming pulses having different frequencies may be generated by one reference oscillator and output to the PWM units 123 to 126, or a plurality of reference oscillators may be provided, each having a different period. The dimming pulses may be output to the PWM units 123 to 126.

  Since the PWM units 123 to 126 correspond to the discharge lamps 111 to 114 of the backlight 110, the microcomputer 120 includes the same number of PWM units as the discharge lamps of the backlight 110.

  The inverter circuit 150 includes a plurality of inverters 151 to 154. Each of the inverters 151 to 154 receives a DC voltage supplied from the output of the AC adapter 130 as a trigger, converts it into a high frequency voltage of several tens of K to several hundreds KHz, and supplies it to the discharge lamps 111 to 114. In addition, dimming pulses generated by the dimming pulse generation circuit 122 and modulated by the PWM units 123 to 126 are input to the inverters 151 to 154. The dimming pulses cause the inverters 151 to 154 to input the discharge lamps 111 to 114, respectively. The high frequency voltage to be supplied is adjusted.

  Thereby, in the backlight lighting device 155 of the present embodiment, the operation of the dimming pulse generation circuit 122 and the PWM units 123 to 126 of the microcomputer 120 is controlled to supply the high frequency to be supplied to the discharge lamps 111 to 114. Arbitrary dimming can be performed on the voltage.

  Since the inverters 151 to 154 also correspond to the discharge lamps 111 to 114 of the backlight 110 as in the PWM units 123 to 126, the inverter circuit 150 includes the same number of inverters as the discharge lamps of the backlight 110. Shall be provided.

  In the backlight lighting device 155 of the present embodiment, the AC adapter 130 includes a switch circuit SW1. The operation of the switch circuit SW1 is controlled by the control means 121 of the microcomputer 120.

  In addition to the basic driving power control of the backlight lighting device 155, the control unit 121 receives a display control signal from the display control unit 167 and performs driving power control for changing the backlight luminance of the backlight lighting device 155. The drive power control performed in response to the display control signal from the display control unit 167 includes changing the backlight brightness, turning on / off the backlight, and partially turning off each of the discharge lamps 111 to 114.

  FIG. 3 is a diagram showing in detail a configuration example of each PWM unit, each inverter, and each discharge lamp of the present embodiment shown in FIG. The circuit shown in FIG. 3 is a generally known inverter circuit for a backlight, and shows a case where one discharge lamp is turned on.

  In FIG. 3, a power source 201 corresponds to the DC voltage supplied from the regulator 131 in FIG. 2, and this DC voltage is converted into a high frequency voltage by an inverter circuit, and the discharge lamp 111 is driven. The PWM dimming circuit unit 203 corresponds to the PWM units 123 to 126 in FIG. 2, and the other circuit portions correspond to the inverters 151 to 154 in FIG. 2.

  The dimming pulse generated by the dimming pulse generation circuit 122 of FIG. 2 is input to the terminal S1 of the PWM dimming circuit unit shown in FIG. 3, and is output to the inverter circuit portion through the transmission circuit. As a result, the drive voltage supplied from the power source 201 and output to the discharge lamp 111 as a high-frequency voltage can be turned on / off at a constant cycle.

  In the present embodiment, the backlight lighting device 155 using CCFT as the light source of the backlight 110 has been described. However, the present invention is not limited to this. For example, an EL (Electro Luminescence) or white LED (Light Emitting Diode) is used as the backlight 110 light source. Other types of light sources can be used. In addition to the backlight 110 method, the illumination light source unit that illuminates the liquid crystal panel 100 includes a front light method, and the backlight method includes an edge light method. Further, a combination of backlight type and edge light type LEDs is also included.

Next, the display control unit 167 of the digital television receiver will be described.
The program information separation unit 163 separates the program supplementary information multiplexed in the received digital broadcast signal (FIG. 4). The broadcast content detection unit 165 acquires the EPG / CM information included in the program supplementary information and outputs it to the display control unit 167. This example shows an example of acquiring EPG and CM information distributed by terrestrial digital broadcasting, but the type of EPG is not limited. For example, G guide, ADAMS-EPG, iEPG for acquiring program data from the Internet, It may be DEPG or ADAMS-EPG +.

  The display control unit 167 processes the video signal decoded by the decoding unit 164 and outputs the processed video signal to the LCD controller 168, and sets a viewing reservation program set by a user operation based on the EPG acquired by the broadcast content detection unit 165. The display control unit 167 has an OSD (On Screen Display) generation function unit therein, and displays information such as a channel, time, and volume on a screen of a television or the like. The OSD data is not an image, but is stored in a format called a bitmap. This bitmap is converted into YUV format pixel values represented by Y, Cb, and Cr, and the converted pixels are used for television broadcasting or the like. Is superimposed on the original image.

  The display control unit 167 performs image display control for controlling at least one of backlight luminance, liquid crystal drive spatial resolution, and temporal resolution based on the set viewing reservation program. As an example of image display control, image display control is performed so that a user-set viewing reservation program can be viewed without fail. Alternatively, image display control is performed so that the viewing reservation program is easier to view than other programs. Image display control is divided into backlight control and liquid crystal drive control depending on the control target. The backlight control is performed by a display control signal from the display control unit 167 to the microcomputer 120 of the backlight lighting device 155, and the microcomputer 120 that has received the display control signal changes the luminance of the backlight 110 and the entire backlight 110 or Turn part on / off. The liquid crystal drive control is performed by a control signal to the LCD controller 168 that supplies a liquid crystal drive signal. The LCD controller 168 that receives the control signal controls the liquid crystal drive signal supplied to the liquid crystal drive circuit 169, and the liquid crystal panel 100. The image display size or the frame frequency fv is changed. A combination of this backlight control and liquid crystal drive control is also possible. For example, when the image size of the liquid crystal panel 100 is reduced, it is preferable to control the lighting area of the backlight 110 to be reduced accordingly.

Hereinafter, the operation of the display device of the television receiver configured as described above will be described.
First, the operation of the backlight lighting device 155 will be described.

  In FIG. 2, the power supply voltage supplied from the AC adapter 130 is converted into a predetermined DC voltage by the regulator 131 and rectified, and then supplied to the microcomputer 120 and the inverter circuit 150.

  The control means 121 of the microcomputer 120 generates a dimming pulse having a predetermined frequency (100 to 400 Hz in the present embodiment) by the dimming pulse generation circuit 122 and outputs the dimming pulse to each PWM unit 123 to 126. Each PWM unit 123 to 126 modulates the input dimming pulse to a preset pulse width and frequency, and outputs the modulated light pulse to each inverter 151 to 154 of the inverter circuit 150.

The inverters 151 to 154 of the inverter circuit 150 convert the DC voltage from the regulator 131 into a predetermined high frequency voltage (40 K to 200 KHz) using the input dimming pulse as a trigger, and this high frequency voltage is converted to each of the backlights 110. It supplies to the discharge lamps 111-114.
Next, the image display control operation of the display device of the television receiver will be described.

[Backlight control]
As image display control, backlight control will be described as an example. This is because the display device consumes the largest amount of power in the backlight unit, and power consumption can be reduced when the backlight control is executed effectively. The backlight control includes changing the backlight luminance, turning on / off the backlight, and controlling partial lighting of the backlight.

  This television receiver receives digital television broadcast programs such as terrestrial waves, CATV, BS, and CS. The broadcast television broadcast program is received by the receiving device as a signal including the received broadcast program from the input terminal, and the received data is input to the present television receiver.

  The tuner 162 is a processing unit that receives a broadcast signal from the antenna 161, selects a specific one or a plurality of program broadcasts, and generates a broadcast stream that can be used in the next processing, and includes a descrambler that pre-processes the program. Consists of including. As shown in FIG. 4, the broadcast stream received by the tuner 162 is generally transmitted by multiplexing program supplementary information. FIG. 4 is a diagram showing the structure of a broadcast stream. As shown in FIG. 4, the broadcast stream has video, audio, and program supplementary information packets. The program supplementary information packet is composed of a header part and an information part. Become. The program supplementary information includes EPG, information for distinguishing whether the broadcast content is a program main part or commercial, and commercial broadcast time (hereinafter referred to as CM information).

  The program information separation unit 163 separates the program supplementary information multiplexed in the received broadcast signal, sends the separated program supplementary information to the broadcast content detection unit 165, and sends the broadcast stream to the decoding unit 164.

The broadcast content detection unit 165 detects an EPG included in the program supplementary information.
The display control unit 167 processes the decoded video signal and outputs the processed video signal to the LCD controller 168, and performs a viewing reservation program setting by a user operation based on the acquired EPG. For viewing reserved program setting, a program guide button installed in the operation unit 166 including a remote control device is pressed to display a list of EPG information on the screen of the liquid crystal panel 100, for example, and a desired program is selected from the displayed EPG ·decide.

  FIG. 5 is a diagram showing a viewing reservation program set based on the EPG. In FIG. 5, 175 is an electronic program guide by, for example, iEPG. In FIG. 5, the electronic program guide 175 displays a program for a time period of 3 hours for 5 channels on one screen. The display in FIG. 5 is an example, and more channels and time zones may be displayed, or display by genre, time order display, and keyword search display may be performed. The user displays the electronic program guide 175 with the EPG button installed in the remote control device, and sets the reserved viewing program 176 based on the electronic program guide 175 by the cross key operation and the enter button. Here, “CH4 19:00 broadcast start professional baseball” is reserved as a viewing reservation program 176.

  The display control unit 167 performs image display control (backlight control here) and image display control setting processing based on the set viewing reservation program. Detailed image display control processing will be described later with reference to FIGS.

  In addition, the display control unit 167 multiplexes a message related to backlight display into a broadcast signal by OSD display and outputs the multiplexed signal to the LCD controller 168, and the LCD controller 168 displays the message on the screen of the liquid crystal panel 100.

  FIG. 6 is a flowchart showing an image display control operation of the television receiver, and is executed by the display control unit 167 of FIG. In the figure, S indicates each step of the flow.

  First, in step S101, an EPG is acquired from the program supplementary information superimposed on the broadcast signal. Specifically, the program supplementary information is separated and acquired from the broadcast signal by the program information separation unit 163, and the EPG included in the program supplementary information is detected by the broadcast content detection unit 165.

  Next, in step S102, setting (selection) for program reservation by the user is performed, and a viewing reservation program is set. The setting of the viewing reservation program is performed by the user checking the program name and the viewing program while viewing the EPG screen display as in the program reservation operation performed by the program reservation device or the like (see FIG. 5). The display control unit 167 extracts the time slot of the viewing reserved program from the EPG reservation setting, and performs image display control of the time slot of the viewing reserved program extracted in the following steps.

  Next, in step S103, it is determined whether or not the image display control mode is set. In the image display control mode (described later with reference to FIG. 7), in step S104, it is determined whether or not the set viewing reservation program is being viewed. If the viewing reservation program is being viewed, the image display control of the viewing reservation program set in the image display control mode is executed in step S105, and this flow is ended. For example, since the image display control mode depends on the energy-saving pattern combination, in the case of corresponding to [Pattern 1] of the backlight control content in FIG. Raise the backlight brightness from the reference level (normal). This backlight control is performed by a display control signal from the display control unit 167 to the microcomputer 120 of the backlight lighting device. In this [Pattern 1] image display control, only backlight control is performed, and liquid crystal drive control is not performed. Accordingly, in the example of FIG. 5, the backlight brightness becomes brighter and easier to watch during viewing of “professional baseball” than before entering the image display control mode.

  On the other hand, when the program is not a viewing reservation program set in step S104, image display control other than the viewing reservation program set in the image display control mode is executed in step S106, and this flow is ended. For example, in the case of [Pattern 1], the backlight luminance is set to a reference level (normal time), and this flow is terminated. As a result, the backlight brightness becomes the reference level during the program viewing time zone other than the set viewing reservation program or during the CM broadcast. Similarly, when the image display control mode corresponds to [Pattern 2] described above, the backlight luminance is maintained at the reference level in step S105, and the backlight luminance is lowered from the reference level in step S106 to reduce power consumption. Electricity is achieved.

FIG. 7 is a flowchart showing the operation of setting the image display control mode.
First, in step S111, the image display control setting screen is OSD-displayed and a user setting input is waited. Next, in step S112, it is determined which one of the energy saving pattern setting and the customization setting is selected from the image display control setting screen displayed on the OSD. If it is energy saving pattern setting, image display control setting by energy saving pattern selection is performed in step S113, and the process proceeds to step S115. If energy saving pattern setting is customized, image display control setting is customized in step S114, and the process proceeds to step S115.

  In this image display control setting screen, a plurality of image display control combination patterns are prepared in advance from the viewpoint of easy viewing and low power consumption. In the present embodiment, each mode of “luminance priority”, “recommendation (normal)”, “energy saving 1”, “energy saving 2”, “energy saving 3”, and “energy saving 4”, and the user can set image display control parameters more finely. Customization ". The user can control the image display according to the user's preference simply by selecting an item such as “luminance priority”. “Luminance priority” is almost the same as [Pattern 1] described above, and “the brightness of the backlight is increased during viewing of a reserved viewing program, and the backlight brightness of a program other than the viewing reserved program or CM is maintained. “Drive control is not performed.” And “Recommendation” are added to the “luminance priority” control “decrease backlight luminance during CM”. “Energy saving 1” is almost the same as [Pattern 2] described above, and “the backlight brightness is secured while viewing reserved programs are watched, and the backlight brightness other than the viewing reserved programs is lowered. “Lower the brightness of the light. Liquid crystal drive control is not performed.” And “Energy saving 2” are added to “Energy saving 1” and “Reduce the frame rate of the liquid crystal drive control during CM”. "Energy saving 3" is added to the above "Energy saving 1", "At the time of CM, the spatial resolution is changed to a small screen display by liquid crystal drive control, and the backlight part is lit on this small screen." “Energy saving 4” is added with the “energy saving 1” control “turn off the backlight and switch to audio only during CM”.

  On the other hand, the “customization” is for the user to individually set each parameter described above. By this customization, the backlight control (brightness / off, partial lighting), the spatial resolution of the liquid crystal panel, or the temporal resolution can be individually set for each viewing reservation program, other program or CM. For example, it is possible to make a setting such that “brightness of the backlight is increased during viewing of a reserved viewing program, and only liquid crystal drive control is performed without performing backlight control for a program or CM other than the reserved viewing program”.

  In step S115, it is determined whether or not the user setting is completed. When the user setting is completed, the backlight control mode set by the user in step S116 is stored as table data, and this flow is terminated. This table data is stored in a nonvolatile memory area of a microcomputer constituting the display control unit 167, for example.

  FIG. 23 is a diagram illustrating an example of a temporal change in backlight luminance by backlight control. As shown in FIG. 23A, when the backlight luminance in a certain channel is observed over time, the backlight luminance changes with time when the backlight control is executed. In this figure, when the backlight luminance is higher than the reference level, it is a broadcast time zone of the viewing reservation program, and when it is the reference level, it is a broadcast time zone other than the viewing reservation program. Further, when the backlight luminance is lower than the reference level, it is a broadcast time zone other than the reserved viewing program in the CM broadcast and the energy saving mode.

  The example in which the backlight luminance is controlled for the set viewing reservation program has been described above, but a modification example in which the spatial resolution and the temporal resolution are controlled as image display control will be described.

[Spatial resolution control]
The backlight control is the most effective for reducing the power consumption, but the power consumption can also be reduced by controlling the spatial resolution and the temporal resolution. When only spatial resolution or temporal resolution is performed, spatial resolution or temporal resolution control is set for each viewing reservation program, other program, or CM in the customization. FIG. 8 is a diagram illustrating an example of a display image on the liquid crystal panel by spatial resolution control. FIG. 8A shows an example in which the original image is ¼ and displayed in the upper center by small screen display by spatial resolution control. Although this alone can hardly be expected to reduce power consumption, as shown in FIG. 8 (b), the combined use of backlight partial lighting in accordance with the small screen display increases the energy saving effect. Further, FIG. 8C shows a display example in which the original image is ¼ by the small screen display. When another light source such as an EL or white LED is used for the backlight 110, the backlight unit can be easily composed of a combination of a plurality of surface light sources. As shown in FIG. Partial lighting can correspond to one of these surface light sources. Although not shown, the spatial resolution control includes not only the small screen display but also a case where the number k of the vertical selection lines shown in the equation (1) is decreased to reduce the resolution.

[Time resolution control]
When only the time resolution is performed, the time resolution control is set for each viewing reservation program, other program or CM in the customization. FIG. 9 is a diagram illustrating an example of a display image on the liquid crystal panel by time resolution control. FIG. 9A shows a normal screen display example, and FIG. 9B shows a screen display example when the frame frequency fv is lowered by the time resolution. As shown in FIG. 9B, flicker (flickering of the display screen) may occur when the frame frequency fv is lowered. Although this time resolution control alone cannot be expected to reduce the power consumption, if the backlight control is used in combination, the reduction in power consumption increases. Further, when the backlight brightness is lowered, there is an effect that the flicker is not noticeable. Furthermore, spatial resolution control can be used together.

  As described above, the television receiver according to the present embodiment includes the broadcast content detection unit 165 that detects EPG included in the program-accompanying information, and the operation unit 166 that sets the program to be viewed, the backlight control mode, and the like. A display control unit 167 that controls at least one of backlight luminance, liquid crystal drive spatial resolution, and temporal resolution based on the set viewing reservation program, and the display control unit 167 includes the set viewing reservation program. Based on the above, the brightness of the backlight 110 of the liquid crystal panel 100 or the liquid crystal driving of the liquid crystal panel 100 is controlled. Specifically, if the user sets a program (program name) and viewing time that the user wants to view, the display control unit 167 raises the backlight brightness higher than the normal brightness or keeps the normal brightness during viewing of the reserved viewing program. At the same time, a program or CM other than the reserved viewing program is controlled to maintain or lower the backlight luminance. Similarly, the spatial resolution and / or temporal resolution are controlled during viewing of the reserved viewing program and during other times. As a result, when the user wants to watch viewing programs with improved viewing conditions during scheduled viewing programs and time zones, a bright and easy-to-read backlight can be ensured while lowering power consumption and achieving an energy saving effect. be able to.

  Further, since the EPG is used, the user can easily select a program, and the designated viewing reservation program can be viewed with a desired brightness.

  In this embodiment, an example in which EPG is detected from program supplementary information included in a digital broadcast signal has been described. However, EPG can be obtained from analog broadcast, and any program that can detect EPG can be used. For example, the EDS signal included in the EDS (Extended Data Service) signal in the vertical blanking interval of the television signal, or the time information and commercial information included in the TELETEXT signal may be used. Of course, the EPG may be information acquired from a network such as the Internet.

Second Embodiment FIG. 10 is a block diagram schematically showing a configuration of a display device according to a second embodiment of the present invention based on the basic concept of FIG. The display device of this embodiment is an example in which a battery-driven display unit is applied to a separation type wireless TV receiver.

  In FIG. 10, a wireless AV system 1 includes a wireless center unit (hereinafter referred to as a wireless center) 2 as a base device and a television (TV) main unit (hereinafter referred to as a TV main body) 3 as a portable terminal. The wireless center 2 (wireless communication device, center device) and the TV body 3 (wireless communication device, display device) are paired to form a wireless transmission network.

  The wireless center 2 includes a BS 1 antenna terminal 11, a U / VHF antenna terminal 12, a diversity terminal 13, a video 1 input terminal 14 with an S terminal for connecting devices such as a digital VTR and a DVD player, a decoder input / video. 2 input terminal 15, monitor / BS output / video 3 input terminal 16, AC power supply unit 17 and Car-DC power supply unit 18.

  The TV main body 3 includes a TV output / video 4 input terminal 21 for connecting devices such as a digital VTR and a DVD (Digital Versatile Disc) player, an AC power supply unit 22 and a Car-DC power supply unit 23.

  The TV main body 3 is a thin display device that is separable from the wireless center 2 and can be carried or carried with a built-in battery. For example, a liquid crystal television (hereinafter referred to as a liquid crystal television), an inorganic EL / organic EL display, a plasma display, a personal computer. This is a broad concept including various display devices such as a monitor for the display, and is not limited by the display mechanism. In this specification, the TV main body 3 mainly has a display function, an acoustic function, and the like, while the wireless center 2 mainly stores a control function for controlling the tuner unit and the TV main body 3. The TV main body 3 according to the present embodiment will be described using a liquid crystal television as an example of a thin display device.

  Data is transmitted and received between the wireless center 2 and the TV main body 3 by an SS (Spread Spectrum) wireless system compliant with the IEEE 802.11 standard. Recently, the 5 GHz band is released as a frequency band, and a mode using the 5 GHz band instead of the 2.4 GHz band may be used. Data transmission from the wireless center 2 to the TV main body 3 uses moving picture expert group (MPEG) 2 video compression format to transmit moving image transmission, DVD-Video, and digital broadcasting over a communication line exceeding 10 Mbps. Further, command transmission between the wireless center 2 and the TV main body 3 is performed by the SS wireless method.

  FIG. 11 is a block diagram showing a configuration of the wireless center 2 of the wireless AV system.

  In FIG. 11, a wireless center 2 is connected to a BS antenna terminal 11 to receive and select a BS broadcast by a channel selection signal, and a U / VHF broadcast is connected to a U / VHF antenna terminal 12 and a channel selection signal. Is a U / VHF tuner 32 that receives and selects a signal, and an EDS signal extracted from a video / audio (AV) signal received and selected by the BS tuner 31 or the U / VHF tuner 32, and sliced to capture data. A slicer processing unit 1000, a video / audio demodulation unit 33 that demodulates a video / audio (AV) signal received and selected by the BS tuner 31 or the U / VHF tuner 32, and audio and EPG received by the audio switching signal An audio switching unit 34 for switching between information relating to the program, video / audio information received by the source selection signal, information relating to the program, A first selector 35 for selecting external input information from the video 1 input terminal 14, the decoder input / video 2 input terminal 15, and the monitor / BS output / video 3 input terminal 16; The data selected by 35 is converted into an MPEG2 video compression format and transmitted to the TV main unit 3 by the SS wireless method, a channel selection signal 41, an audio switching signal 42, a source selection signal 43, and data slice control. A wireless center microcomputer (hereinafter referred to as a microcomputer) 37 that transmits signals and transmits / receives TV commands 44 to control the entire apparatus, a control program for the wireless center microcomputer 37, communication control data, and a communication channel change program Electrically rewritable to store various data such as Constructed and a EEPROM (electrically erasable programmable ROM) 38 is a nonvolatile memory.

  The wireless center 2 may include a plurality of (two in this case) broadcast receiving tuners, and at least one of the plurality of BS tuners 31 and U / VHF tuners may be a tuner capable of receiving terrestrial digital broadcasting.

  The data slicer processing unit 1000 receives the 21st horizontal field of the second field in the vertical blanking period from the video / audio (AV) signal received and selected by the tuners 31 and 32 according to the data slicer control signal from the microcomputer 37. A data slice process for extracting the EDS signal superimposed on the scanning line and slicing the data is performed. This data includes EDS data such as the start code and time data described above.

  The wireless center microcomputer 37 controls the entire wireless center apparatus and has a function as a data slicer control unit for controlling the data slicer processing unit 1000. The wireless center microcomputer 37 controls the data slicer processing unit 1000 to obtain a code by extracting EDS data. Execute. The EEPROM 38 stores information such as broadcast station names and broadcast station series names included in the EDS data.

  Further, the wireless center microcomputer 37 has functions as the program information separation unit 163, the decoding unit 164, and the broadcast content detection unit 165 of FIG.

  The SS transmission unit 36 includes an A / D conversion unit 51 that converts the data selected by the first selector 35 into a digital signal, an MPEG2 encoder 52 that converts the data into an MPEG2 video compression format, and transmission data according to the SS wireless system. An SS radio transmission engine 53 including an SS radio device and a radio control unit for transmission, and each part of the SS transmission unit are controlled, and a first SS-CPU 54 that detects a radio wave state is provided.

  The SS wireless transmission engine 53 has a transmission function for transmitting an MPEG2 stream, a command, and the like to an SS reception unit 61 (described later in FIG. 12) of the TV body 3 and a reception function for receiving a command and the like from the SS reception unit 61. Prepare.

  The data slicer processing unit 1000 has a function as program information acquisition means for detecting program supplementary information and time information included in the EDS.

  FIG. 12 is a block diagram showing a configuration of the TV main body 3 of the wireless AV system, which corresponds to a TV receiver including a battery-powered display device.

  In FIG. 12, the TV main body 3 receives and transmits a TV command and receives an MPEG2 stream and command transmission data transmitted from the SS transmission unit 36 of the wireless center 2, and decodes (restores) the received MPEG2 stream and the like into original data. ) SS receiving unit 61, a second selector 62 for selecting data restored by SS receiving unit 61 and an AV signal input from the outside via TV output / video 4 input terminal 21, and a video signal are displayed The TV microcomputer 63 (image) controls the entire apparatus and controls the image display by transmitting and receiving TV commands 71 to and from the TV display unit 63 comprising an LCD or the like for outputting audio signals, and transmitting the source selection signal 72, OSD 73, etc. Display control means, priority order setting means) and control program of the TV microcomputer 64 Control commands from an EEPROM 65, which is an electrically rewritable non-volatile memory for storing various data such as a program, communication control data, and a communication channel change program, and a remote control device not shown (hereinafter referred to as a remote control device). A remote control light receiving unit 66 that receives light, a battery 67, and a battery charger microcomputer 68 (battery remaining amount detecting means) that controls charging / discharging of the battery 67 and detects the remaining amount of the battery are configured.

  The remote control device has a function as an operation unit for inputting user operation information such as a viewing reservation program, scheduled viewing time setting, and backlight control mode setting.

  The SS reception unit 61 includes an SS radio reception engine 81 including an SS radio and a radio control unit that receives data transmitted by the SS radio system, an MPEG2 decoder 82 that decodes the received MPEG2 stream, and an analog signal for the decoded data. The D / A conversion unit 83 for converting the signal to the signal and the respective units of the SS receiving unit are controlled, and the second SS-CPU 84 for detecting the radio wave state is provided.

  The SS radio reception engine 81 has a reception function for receiving an MPEG2 stream, a command and the like from the SS transmission unit 36 of the wireless center 2 and a transmission function for transmitting a command and the like from the SS reception unit 61.

  The TV display unit 63 is a display device of a TV receiver, and similarly to FIG. 2, the liquid crystal panel, the backlight for irradiating the liquid crystal panel, the supply power voltage, and the battery remaining amount detection are the basic parameters. Further, a backlight lighting device that performs backlight luminance control according to a display control signal from the TV microcomputer 64, an LCD controller that supplies a liquid crystal drive signal, and a liquid crystal drive circuit that outputs a drive voltage to the liquid crystal panel by the liquid crystal drive signal are provided. Prepare inside.

  Here, the correspondence between the TV display unit 63 and the display device of the television receiver of FIG. 2 will be described. That is, in the display device of the television receiver of FIG. 2, the liquid crystal panel 100, the backlight 110, the microcomputer 120, the regulator 131, the inverter circuit 150, the operation unit 166, the display control unit 167, the LCD controller 168, and the liquid crystal drive circuit 169 are provided. As a whole, it corresponds to the TV display unit 63.

  The TV microcomputer 64 corresponds to the display control unit 167 in FIG. 2, processes the decoded video signal and outputs it to the LCD controller of the TV display unit 63, and backlight luminance based on the set viewing reservation program And controlling at least one of a spatial resolution of liquid crystal driving and a temporal resolution. The TV microcomputer 64 is assigned with a program execution time of a predetermined timing and executes the image display control process shown in FIGS. 6, 7, and 15. The details of the image display control process will be described later in detail.

  The battery 67 is made of a lithium ion storage battery or the like and supplies predetermined power to each part of the TV main body 3. When the battery 67 is in a chargeable state, the battery charger microcomputer 68 detects, for example, that the TV main body 3 is attached to the wireless center 2 or other cradle, and supplies a power supply terminal ( In either case, charging / discharging is controlled via a not shown). Specifically, the battery charger microcomputer 68 integrates the discharge current of the battery pack for each usage time, and starts charging when it is determined that the remaining capacity of the battery pack has become a predetermined value or less. When the battery pack determines that the battery pack is fully charged, the charging is stopped. The charged battery 67 becomes the main power source of the portable TV when the TV main body 3 is disconnected from the commercial power source, and supplies power to each part of the main body.

  The battery charger microcomputer 68 has a function as battery remaining amount detection means for detecting the voltage of the battery 67. The battery charger microcomputer 68 detects the voltage of the battery 67 and corrects the value based on various battery characteristics stored in the battery remaining amount setting table.

  21 and 22 are diagrams showing battery discharge characteristics that are the basis of the table data of the battery remaining amount setting table. FIG. 21 shows general battery discharge characteristics, and FIG. 22 shows discharge temperature characteristics. It is. The battery remaining amount setting table stores table data based on these battery discharge characteristics, and the battery charger microcomputer 68 controls the drive power supply with reference to this table data. As shown in FIG. 22, since the battery discharge capacity varies depending on the ambient temperature, a temperature sensor 68a is installed around the device or the battery, for example, in the vicinity of the battery 67, as shown in FIG. 12, and the installed temperature sensor 68a. To detect the battery temperature in use. Based on the discharge characteristic curve according to the detected temperature, the battery remaining time setting table is referred to determine the battery driving time.

Next, image display control of the TV microcomputer 64 of the TV receiver will be described.
10 to 12, the wireless center microcomputer 37 separates the program supplementary information multiplexed in the received digital broadcast signal (FIG. 4), and acquires the EPG included in the program supplementary information. This example shows an example of acquiring an EPG distributed by terrestrial digital broadcasting, but the type of EPG is not limited. This information is transmitted by the SS transmission unit 36 to the SS reception unit 61 of the TV body 3. Various information received by the SS receiving unit 61 is output to the TV microcomputer 64.

  The TV microcomputer 64 processes the decoded video signal and outputs the processed video signal to the LCD controller of the TV display unit 63, and performs a viewing reservation program setting by a user operation based on the acquired EPG.

  When the TV microcomputer 64 performs image display control processing, image display control for controlling at least one of backlight luminance, liquid crystal drive spatial resolution, and time resolution based on the set viewing reservation program is performed. Do.

  In particular, in the present embodiment, image display control is performed so that a user-set viewing reservation program can always be viewed as an example of image display control by detecting the remaining battery level. Alternatively, image display control is performed so that the viewing reservation program is easier to view than other programs. Image display control is divided into backlight control and liquid crystal drive control depending on the control target. The backlight control is performed by the TV microcomputer 64, and changes the brightness of the backlight of the TV display unit 63 and turns on or off all or part of the backlight. Further, the liquid crystal drive control is performed by a control signal to the LCD controller of the TV display unit 63 that supplies the liquid crystal drive signal. The LCD controller that receives the control signal controls the liquid crystal drive signal supplied to the liquid crystal drive circuit, Change the image display size or frame rate of the LCD panel. A combination of this backlight control and liquid crystal drive control is also possible.

  The TV microcomputer 64 also detects the remaining battery level detected by the battery charger microcomputer 68, the set viewing reservation program (when there are a plurality of viewing reservation programs), the broadcast time, and the viewing reservation program. Image display control is performed based on the time information. Taking backlight control as an example, if it is determined that the remaining battery level is more than a predetermined amount until the set viewing reservation program ends, and the user has set the backlight control mode, the set viewing program is being viewed. Controls to maintain or increase the backlight brightness. Further, the backlight luminance is lowered for the screen display other than the reserved viewing program so that the set viewing reserved program can be viewed without fail.

  FIG. 23 is a diagram illustrating an example of a time change in backlight luminance by backlight control. FIG. 23B illustrates a case where the remaining battery level is greater than or equal to a predetermined level, and FIG. The case where there are few is shown. As shown in FIG. 23 (b), when the remaining battery level is greater than or equal to a predetermined level, the remaining battery level is not detected, but the backlight luminance changes with time as in FIG. 23 (a). As shown in FIG. 23 (c), control is performed so as to lower the backlight luminance level while maintaining the temporal change in backlight luminance.

Hereinafter, the operation of the display device of the television receiver configured as described above will be described.
As the image display control, backlight control is taken as an example. The backlight control includes changing the backlight luminance, turning on / off the backlight, and controlling partial lighting of the backlight. Although backlight control is taken as an example, similar image display control is possible for liquid crystal display control that changes the image display size and the frame frequency fv of the liquid crystal panel 100 as in the modification of the first embodiment. It is.

  FIGS. 13 and 14 are flowcharts showing the backlight control operation of the television receiver, which is executed by the TV microcomputer 64 of FIG. The backlight control corresponds to [Pattern 1] of the backlight control content described above.

  First, in step S1, an EPG is acquired from the program supplementary information superimposed on the broadcast signal. Specifically, program supplementary information is separated and acquired from the broadcast signal by the wireless center microcomputer 37 of FIG. 11, EPG included in the program supplementary information is detected, and the TV is transmitted via the SS transmission unit 36 and the SS reception unit 61. The microcomputer 64 acquires. Note that iEPG, DEPG, and ADAMS-EPG + that fetch program data from the Internet may be used as in the first embodiment.

  Next, in step S2, a viewing reservation program by the user is set. For setting the viewing reservation program, the user checks the program name and viewing program with the remote control device while viewing the EPG screen display as in the program reservation operation performed by the program reservation device or the like. For example, in FIG. 5, it is assumed that “CH4 19:00 broadcast start professional baseball” of the viewing reservation program 176 is reserved for viewing based on the electronic program guide 175.

  In step S3, the current battery remaining amount is detected by the battery charger microcomputer 68. When viewing at normal brightness in step S4, viewing of all set viewing reserved programs is finished (if there are a plurality of viewing reserved programs, the last of them). It is determined whether or not the program can be viewed until the viewing reservation program ends). The normal brightness is a backlight brightness with a default value. As described below, it is possible to effectively perform backlight control such as controlling the backlight luminance so as to keep it longer than the viewing time, and maintaining the backlight luminance or controlling it brighter when a scheduled program is displayed.

  If all of the set viewing reservation programs can be viewed, it is determined whether or not the viewing reservation program start time set in step S5 is reached, and the process waits until the set viewing reservation program start time is reached. For example, if “CH4 19:00 broadcast start professional baseball” shown in FIG. 5 is reserved for viewing as the viewing reservation program 176, a predetermined time before the viewing reservation start time (19:00) of the viewing reservation program 176 ( For example, wait until 5 minutes).

  In step S6, the current battery remaining amount is detected by the battery charger microcomputer 68, and it is determined whether or not the backlight brightness during viewing of the viewing reservation program set from the remaining battery amount detected in step S7 can be increased. . In the example of FIG. 5, the current remaining battery level is detected 3 minutes before the viewing reservation start time (19:00), and the maximum broadcast time of the viewing reservation program 176 “Pro Baseball” set from the detected remaining battery level It is determined whether or not the backlight brightness can be increased during the scheduled broadcast time of 2 hours and 54 minutes from (19:00:00 to 21:54). In the description of this flow, it is described that the backlight luminance is increased from the normal time during viewing of the viewing reservation program, which means that the set viewing reservation program has a viewable luminance. In addition to increasing the backlight brightness to make it easier to see, this includes the case of maintaining the backlight brightness during viewing of a viewing reservation program.

  If the remaining battery level is greater than or equal to the predetermined level and the backlight luminance can be increased, it is determined in step S8 whether or not the backlight control mode is set. When in the backlight control mode (described later with reference to FIG. 15), the backlight brightness is increased from the normal time during viewing of the reserved viewing program set in step S9. This backlight control is performed by a display control signal from the display control unit 167 to the microcomputer 120 of the backlight lighting device. In the example of FIG. 5, the backlight brightness becomes brighter during viewing of “professional baseball”, making viewing easier.

  In step S10, it is determined whether or not the viewing time of the set viewing reservation program has elapsed. If the viewing time of the set viewing reservation program has not elapsed, the process returns to step S9 to return the set viewing program. The backlight brightness is increased from the normal state until the viewing time elapses. When the viewing time of the set viewing reservation program has elapsed, the process proceeds to step S11.

  If the backlight brightness cannot be increased from the remaining battery level detected in step S7, or if the backlight control mode is not set in step S8, the process proceeds to step S11, and the backlight brightness is returned to normal in step S11. This flow ends.

  On the other hand, when it is not possible to view until the end of viewing of the set viewing reserved program at the normal brightness in step S4, the viewable time until the end of the set viewing reserved program when the backlight luminance is lowered is calculated in step S12. The viewable time is preferably calculated for each case where the backlight luminance is lowered at each stage.

  In step S13, it is determined whether or not the set viewing reserved program can be viewed until the viewing end when the backlight luminance is minimized. If the backlight luminance is set to the lowest and if the set viewing reservation program can be viewed until the viewing end, it is determined in step S14 whether or not the backlight control mode is set. If it is in the backlight control mode, the backlight luminance is controlled so that the program can be viewed until the end of the reserved viewing program set in step S15, and this flow ends. In this backlight control mode, it is possible to control the backlight brightness as much as possible during viewing of the set viewing reservation program, while allowing viewing until the end of the set viewing reservation program. If it is not in the backlight control mode, this flow ends.

  When the backlight brightness is minimized in step S13, if the set viewing reserved program cannot be viewed until the viewing end, the message (see FIG. 16) indicating that the viewing cannot be completed until the viewing program set in step S16 is output. This flow ends.

  FIG. 16 is a diagram illustrating an example of a message 171 displayed on the broadcast screen 170 of the TV display unit 63 that cannot be viewed until the end of the reserved viewing program. As shown in FIG. 16, “Unable to watch until the set program ends. Can be watched for about XX in the energy saving mode” is displayed below the broadcast screen 170. In addition, a display position and a display form are not limited to FIG. For example, the OSD may display a gauge indicating the viewable time (a block display with one second as one block) and the viewable time value, or display the viewable time in a flashing manner. A mode of displaying in stages by identification may also be used. Further, a sound codec (a part of output means) for digitally processing the output signal from the TV microcomputer 64 may be installed as a sound generator. The audio codec is configured by a PCM (Pulse Code Modulation) sound source IC or the like, and converts a signal received from the TV microcomputer 64 into an audio signal and outputs it from a speaker. For example, “You cannot watch until the end of the set program. You can watch about ○○ if you set the energy saving mode. The setting method of the energy saving mode is △△”. Pronounces human voice data.

  In the present embodiment, the example of controlling the backlight luminance for the set viewing reservation program has been described. However, the present invention can be applied not only to the viewing reservation program but also to a set time arbitrarily set by the user. For example, when the user wants to change the backlight brightness when the user is in a garden or the like, the user can arbitrarily set an image display control time, and the control can be performed in the same manner as the viewing reservation program.

FIG. 15 is a flowchart showing the operation of setting the backlight control mode.
First, the backlight control setting screen is OSD-displayed in step S31, and a user setting input is waited for in step S32. When the user setting is completed, the backlight control mode set by the user in step S33 is stored as table data. This table data is stored in a nonvolatile memory area of a microcomputer constituting the TV microcomputer 64, for example. The backlight control mode includes, for example, backlight control on / off and normal mode / energy saving mode. The energy saving mode includes a CM backlight not changed (normal), low luminance, and OFF.

  The backlight control has been described above as an example of the image display control, but the image display size of the liquid crystal panel of the TV display unit 63 as in the modified example [spatial resolution / time resolution control] of the first embodiment. The same image display control is possible for the liquid crystal display control for changing the frame frequency fv. Specifically, the image display control setting flow of FIG. 7 is executed instead of the backlight control setting flow of FIG. 15, and the flow of FIG. 7 is performed in the backlight control step (step S9, step S11, step S15) of FIG. The image display control set in step 1 may be executed.

  As described above, the display device according to the present embodiment includes the TV main body 3 that is a portable display device of a display-separated wireless TV receiver, and includes the battery charger microcomputer 68 that detects the remaining battery level, and the TV microcomputer 64. Controls the brightness of the backlight of the liquid crystal panel of the TV display unit 63 or the liquid crystal drive of the liquid crystal panel based on the set viewing reservation program. Specifically, if the TV microcomputer 64 sets a program (program name) and viewing time that the user wants to view, the TV display unit 63 backlights the set viewing reservation program and viewing time so that the set viewing program and viewing time can be viewed without fail. Control brightness. Further, when the user has set the backlight control mode, the backlight brightness is controlled to be higher than the normal brightness during viewing of the set viewing program. As a result, it is possible to achieve low backlight power consumption and greatly extend the battery drive time while ensuring a bright backlight that is bright and easy for the user to view in the time zone that the user originally wants to view.

  In the present embodiment, the example of controlling the backlight luminance for the set viewing reservation program has been described. However, the present invention can be applied not only to the viewing reservation program but also to a set time arbitrarily set by the user. For example, when the user wants to change the backlight brightness when the user is in a garden or the like, the user can arbitrarily set an image display control time, and the control can be performed in the same manner as the viewing reservation program.

  In addition, since the user can easily set the time, when viewing only for a short time (for example, when viewing in a garden), the brightness can be increased.

  In addition, since EPG is used, it can be applied to a mobile TV that receives future mobile TV broadcasts, and can be suitably used for a battery-powered TV. The present invention is not limited to a device using an EPG or a television receiver, and can be applied to various backlight driving devices.

  As described above, since this backlight control is used for the TV main body 3 which is a portable display device of a display-separated wireless TV receiver, the same effects as those of the first and second embodiments can be obtained. The present invention can be applied to a portable television, and the battery driving time can be greatly extended while ensuring a bright and easy-to-read backlight for the user.

Accordingly, not only mobile TVs that receive mobile TV broadcasts, but also general portable viewing devices having a display device with a backlight, for example, a portable video playback device that incorporates a personal computer, HDD, etc., and plays recorded video, portable It can be applied to display devices such as telephone / PHS (Personal Handy-Phone System) and PDA (Personal Digital Assistants) to improve the visibility and battery life of these devices. become.
Third Embodiment In the first embodiment, image display control has been described, and in the second embodiment, backlight control has been described as an example of battery-driven display device image display control. In the present embodiment, more specific and detailed examples of backlight control and liquid crystal drive control will be described from the viewpoint of energy saving during battery driving.

  Since the hardware configuration of the display device of the television receiver according to the present embodiment is the same as that of the second embodiment, description thereof is omitted.

  18 and 19 are flowcharts showing an image display control operation of the display device according to the third embodiment of the present invention, which is executed by the TV microcomputer 64 of FIG. Steps for performing the same processing as in the flow of FIGS. 13 and 14 are given the same step numbers and description thereof is omitted.

  When viewing at normal brightness in step S4 is impossible until viewing of all set viewing reservation programs is completed (when there are a plurality of viewing reservation programs, the last viewing reservation program ends), the process returns to step S41. Calculates the viewable time until the set viewing reservation program ends when the light luminance is lowered at each stage and when the liquid crystal display control is performed to change the image display size or the frame frequency fv of the liquid crystal panel of the TV display unit 63. . The viewable time is preferably calculated for partial lighting of the backlight corresponding to a case where the image display size is reduced.

  In step S13, it is determined whether or not the set viewing reserved program can be viewed until the viewing end when the backlight luminance is minimized. If the backlight luminance is set to the lowest and if the set viewing reservation program can be viewed until the viewing end, it is determined in step S14 whether or not the backlight control mode is set. If it is in the backlight control mode, the backlight luminance is controlled so that the program can be viewed until the end of the reserved viewing program set in step S15, and this flow ends. In this backlight control mode, it is possible to control the backlight brightness as much as possible during viewing of the set viewing reservation program, while allowing viewing until the end of the set viewing reservation program. If it is not in the backlight control mode, this flow ends.

  When the backlight brightness is minimized in step S13 and viewing is not possible until the end of viewing of the set viewing reserved program, the setting of the viewing reserved program is set when the frame frequency fv indicated by the equation (1) is lowered in step S42. It is determined whether or not it can be viewed until the end of viewing. When the frame frequency fv is lowered, if the set viewing reservation program can be viewed until the end of viewing, the backlight luminance is minimized in step S43, and image display control is performed to lower the frame frequency fv, and this flow is finished.

  If it is not possible to view until the end of viewing of the set viewing reservation program even if the frame frequency fv is lowered in step S43, the image display size of the liquid crystal panel of the TV display unit 63 is reduced in step S44 (for example, FIG. 8C). If the corresponding backlight is partially lit, it is determined whether or not the set viewing reserved program can be viewed until the viewing ends. When the size of the image display is reduced and the corresponding backlight is partially lit, if the viewing of the set viewing reservation program can be completed, the size of the image display is reduced in step S45 and the corresponding backlight portion is displayed. The image display control for lighting is performed, and this flow ends.

  Even if the image display size is reduced in the above step S44 and the corresponding backlight is partially turned on, if it cannot be viewed until the end of the set viewing reservation program, it cannot be viewed until the end of the viewing program set in step S16. Message (see FIG. 16) is output and this flow is terminated.

  Thus, according to the present embodiment, as in the second embodiment, a bright and easy-to-view backlight is secured for the set viewing reservation program, and the main part other than the viewing reservation program is booked. Low power consumption can be achieved by image display control.

  In particular, in the present embodiment, since the liquid crystal drive control is performed in addition to the backlight control, the battery drive time can be further extended as compared with the case where only the backlight control is performed. In addition, since the number of options that can be viewed until the set viewing reservation program ends can be increased, there is an effect that the viewing reservation program set by combining the options can be viewed more reliably.

  In the present embodiment, the example in which the liquid crystal drive control and the backlight control are used together has been described. However, it is needless to say that the liquid crystal drive control may be performed without using the backlight control as the image display control.

  Further, the backlight control of the present embodiment corresponds to the above-described backlight control content [Pattern 1] as in the first and second embodiments, but instead of this, [Pattern 2]. As described above, the backlight brightness may be ensured while viewing reservation program is being viewed, the backlight brightness other than the reservation reservation program is lowered, and the backlight brightness may be lowered or turned off during CM. Such a display control combination is preferably set as an “energy-saving mode” in which a plurality of patterns are prepared in advance as described in FIG. 7 and selected by the user.

  In the present embodiment, liquid crystal drive control and backlight control are used in combination. As an example, in the above [Pattern 2], not only “decrease or turn off the backlight brightness during CM”, or instead, the image display size of the liquid crystal panel of the TV display unit 63 is reduced (for example, It is also possible to perform partial lighting of the backlight only for the corresponding small image display area.

Further, similarly to the second embodiment, the present invention can be applied not only to a viewing reservation program but also to a set time arbitrarily set by a user.
Fourth Embodiment The fourth embodiment is an example of image display control in which priority is set when there are a plurality of set viewing reservation programs.

  Since the hardware configuration of the display device of the television receiver according to the present embodiment is the same as that of the second embodiment, description thereof is omitted.

  19 and 20 are flowcharts showing the image display control operation of the display device according to the fourth embodiment of the present invention, which is executed by the TV microcomputer 64 of FIG. Steps for performing the same processing as in the flow of FIGS. 13 and 14 are given the same step numbers and description thereof is omitted. The backlight control corresponds to [Pattern 1] of the backlight control content described above.

  First, EPG is acquired from the program supplementary information superimposed on the broadcast signal in step S1, and a viewing reservation program by the user is set in step S2. In setting the viewing reservation program, the user checks the program name and viewing program while viewing the EPG screen display as shown in FIG.

  In step S51, the priority order of the set viewing reservation program is set. If there are a plurality of reserved viewing programs, priority is given in this step S51. The main purpose of assigning priorities is to make it possible to first view high priority items in relation to mobile (remaining battery power). It is preferable that the priority setting reflects the user's intention as much as possible and the setting procedure is simple. In this example, “viewing reservation order setting” that gives priority to the order of viewing reservation setting is used. This is based on the rule of thumb that the user reserves viewing in order from the program that he / she wants to view and the fact that no special setting procedure is required and the user is not burdened. Moreover, when setting a viewing reservation program, it is good also as "user setting" which a user inputs a priority. In this way, the user's intention can be reliably reflected in the image display control. In this case, if the “user setting” is performed only when the user particularly wants to give priority based on the “viewing reservation order setting”, the user burden is further reduced. Furthermore, “series program priority setting” that prioritizes the priority order of series programs may be used. This is performed using a series program extraction technique, and sets a higher viewing priority for a series program related to a series program that the user has viewed in the past. For example, it can be estimated that what is watched every week, such as a series program, can be reflected, and the user's intention can be more reflected without user input.

  In this example, since “viewing reservation order setting” is used, for example, “CH4 19 o'clock broadcast professional baseball” shown in FIG. 5 is reserved for viewing as the first viewing reservation program 176, and then “CH1 17 : 10 broadcast start Metropolitan area network ”is reserved as a viewing reservation program 177, the priority order is“ professional baseball ”and“ Metropolitan area network ”.

  In step S3, the battery charge microcomputer 68 detects the current remaining battery level, and in step S4, when viewing at normal brightness, viewing of all set viewing reservation programs is finished (if there are multiple viewing reservation programs, the last of them). It is determined whether or not the program can be viewed until the viewing reservation program ends.

  If all of the set viewing reservation programs can be viewed, it is determined whether or not the viewing reservation program start time set in step S5 is reached, and the process waits until the set viewing reservation program start time is reached. In the example of FIG. 5, “17:10 broadcast metropolitan area network” waits until a predetermined time (for example, 3 minutes before) the viewing reservation start time.

  Whether or not the current charge level of the battery is detected by the battery charge microcomputer 68 in step S6, and whether or not the backlight brightness during viewing of the reserved program set based on the remaining battery level and priority detected in step S52 can be increased. Is determined. In the example of FIG. 5, the current battery level is detected 3 minutes before the “Metropolitan area network” viewing reservation start time, and the broadcast time of the viewing reservation program 177 “Metropolitan area network” set from the detected remaining battery level It is determined whether or not the backlight brightness can be increased during the scheduled broadcast time from (50 minutes) to the end of the maximum broadcast time (19:00 to 21:54) of the viewing reservation program 176 “Professional baseball”. This determination is based on whether the viewing brightness of the viewing reservation program 176 “Pro Baseball” and the viewing reservation program 177 “Metropolitan area network” can be increased, or the backlight of the viewing reservation program 176 “Pro Baseball” with a high priority. A plurality of conditions are determined such as whether the backlight brightness of the reserved viewing program 177 “Metropolitan area network” is maintained and whether the backlight brightness is maintained for both of the viewing reserved programs 176 and 177.

  If the remaining battery level is greater than or equal to the predetermined level and the backlight luminance can be increased, it is determined in step S8 whether or not the backlight control mode is set. When in the backlight control mode, the backlight brightness is increased from the normal time during viewing of the viewing reservation program set based on the priority order in step S53. That is, based on the determination result of step S52, the backlight brightness of the reserved viewing program is increased in descending order of priority within the battery remaining amount range. If the remaining battery level is sufficient, both the viewing reservation program 176 “Pro Baseball” and the viewing reservation program 177 “Metropolitan area network” can increase the backlight brightness. Although the backlight brightness of the viewing reservation program 176 “professional baseball” with higher rank can be increased, the backlight brightness of the viewing reservation program 177 “Metropolitan area network” is maintained as it is. In this example, the remaining battery level is rechecked immediately before the above determination (step S6). Therefore, when multiple viewing reservation programs are set, the remaining battery level immediately before the start of the viewing reservation program is set. Whether or not the light luminance is increased dynamically changes.

  In step S10, it is determined whether or not the viewing time of the set viewing reservation program has elapsed. If the viewing time of the set viewing reservation program has not elapsed, the process returns to step S9 to return the set viewing program. The backlight brightness is increased from the normal state until the viewing time elapses. When the viewing time of the set viewing reservation program has elapsed, the process proceeds to step S11.

  If the backlight brightness cannot be increased from the remaining battery level detected in step S7, or if the backlight control mode is not set in step S8, the process proceeds to step S11, and the backlight brightness is returned to normal in step S11. This flow ends.

  Thus, in this embodiment, since the priority order is set for the viewing reservation program, even if the remaining battery level is limited, the viewing reservation program with a high priority has a bright and easy-to-read backlight luminance. Secured.

  Incidentally, since the first to fourth embodiments use CCFT as the light source of the backlight, the partial lighting of the backlight corresponding to the case where the size of the image display is reduced is only the upper part of the backlight 110, for example. It becomes a mode to light up. However, when another light source such as EL or white LED is used for the backlight, the backlight unit can be easily configured from a combination of a plurality of surface light sources. It can correspond to one. If a white LED is used as the light source of the backlight, the circuit scale is reduced because the inverter circuit and the like are not required because of the extremely low power consumption and long life. Further, since the white LED emits light by a constant current supplied from a constant current circuit, fine backlight brightness control can be performed by current control.

  As described above in detail, the first embodiment is an example applied to a display device not driven by a battery, and the second to fourth embodiments are applied to a display device driven by a battery. This invention is effective from the viewpoint of electric power. When viewing reservation program or set time that the user really wants to watch, increase the backlight brightness to make it easier to see, lower the backlight brightness during other times, or lower / off the backlight brightness during CM, etc. A user-friendly and easy-to-view device can be realized.

  Note that the display device and the television receiver of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the present invention can be applied to a television receiver as described above, but is not limited to this, and can be applied to all systems. It may be incorporated as a communication function of a recording / reproducing apparatus or a television receiver. Furthermore, it may be an apparatus integrated with information equipment functions represented by a personal computer.

  Also, any type of broadcast information, broadcast signal, and time information may be used. The EPG and time information are not limited to broadcast signals, but may be information acquired from a network such as the Internet.

  Moreover, although the names “display device” and “television receiver” are used in each of the above-described embodiments, this is for convenience of explanation, such as a fluorescent tube lighting control device, a backlight control device, a portable viewing device, a display control method, and the like. Of course, it may be.

  Moreover, although each said embodiment demonstrated the example which used the multi-lamp type backlight which consists of several fluorescent lamps etc. on the back of a display, it controls the brightness of the screen displayed using a display panel. Needless to say, the present invention can be similarly applied to a front light when a reflective liquid crystal display is used. Furthermore, the display device using a self-luminous display such as a self-luminous organic EL (Electro Luminescence) is also suitable for application from the viewpoint of brightness adjustment and energy saving that are easy for the user to see.

  Furthermore, it goes without saying that the display device, the control device of the system constituting the television receiver, the type of storage device, the type of data, the selection method, the screen display method, etc. are not limited to the above-described embodiments. Not limited to this, it may be realized by hardware.

  The display device and the television receiver described above are also realized by a program for causing the television receiver or the like to function. This program is stored in a computer-readable recording medium. In the present invention, as the recording medium, the main memory itself may be a program medium, or a program reading device is provided as an external storage device and can be read by inserting the recording medium therein. May be. In either case, the stored program may be configured to be accessed and executed by the CPU, or in any case, the program is read and the read program is not shown in a program storage area. The program may be downloaded and executed by the program. It is assumed that this download program is stored in the main device in advance.

It is a block diagram explaining the basic concept of this invention. It is a block diagram which shows roughly the structure of the television receiver of the 1st Embodiment of this invention. It is a figure which shows in detail the example of a structure of each PWM part, each inverter, and each discharge lamp of the television receiver of this Embodiment. It is a figure which shows a broadcast stream structure. It is a figure which shows the viewing-and-listening reservation program set based on EPG. It is a flowchart which shows the image display control operation of the television receiver of this Embodiment. It is a flowchart which shows the operation | movement of the image display control mode setting of the television receiver of this Embodiment. It is a figure which shows the example of a display image of the liquid crystal panel by the spatial resolution control of the television receiver of this Embodiment. It is a figure which shows the example of a display image of the liquid crystal panel by the time resolution control of the television receiver of this Embodiment. It is a figure which shows the structure of the television receiver of the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the wireless center of the television receiver of this Embodiment. It is a block diagram which shows the structure of TV main body of the television receiver of this Embodiment. It is a flowchart which shows the backlight control operation | movement of the television receiver of the 3rd Embodiment of this invention. It is a flowchart which shows the backlight control operation | movement of the television receiver of this Embodiment. It is a flowchart which shows the operation | movement of the backlight control mode setting of the television receiver of this Embodiment. It is a figure which shows an example of the message that it cannot watch until the viewing-and-listening program end displayed on the broadcast screen of the screen display part of the television receiver of this Embodiment. It is a flowchart which shows the image display control operation of the television receiver of the 3rd Embodiment of this invention. It is a flowchart which shows the image display control operation of the television receiver of this Embodiment. It is a flowchart which shows the image display control operation of the television receiver of the 4th Embodiment of this invention. It is a flowchart which shows the image display control operation of the television receiver of this Embodiment. It is a figure which shows the battery discharge characteristic used as the basis of the table data of the battery residual amount setting table of the television receiver of this Embodiment. It is a figure which shows the battery discharge characteristic used as the basis of the table data of the battery residual amount setting table of the television receiver of this Embodiment. It is a figure which shows an example of the time change of the backlight brightness | luminance by the backlight control of the television receiver of this Embodiment.

Explanation of symbols

1 Wireless AV System 2 Wireless Center Unit (Wireless Center) (Radio Communication Device, Center Device)
3. Television main unit (TV main unit) (wireless communication device, display device)
31 BS tuner 32 U / VHF tuner 33 Video / audio demodulation unit 34 Audio switching unit 35 First selector 36 SS transmission unit 37 Wireless center microcomputer 38, 65 EEPROM
51 A / D converter 52 MPEG2 encoder 53 SS wireless transmission engine 54 SS-CPU
61 SS receiving unit 62 2nd selector 63 TV display unit 64 TV microcomputer (image display control means, priority order setting means)
66 Remote control light receiving unit 67 Battery 68 Battery charger microcomputer (Battery remaining amount detecting means)
81 SS wireless reception engine 82 MPEG2 decoder 83 D / A converter 84 Second SS-CPU
DESCRIPTION OF SYMBOLS 100 Liquid crystal panel 110 Backlight 111,112,113,114 Discharge lamp 120 Microcomputer 121 Control means 122 Dimming pulse generation circuit 123,124,125,126 PWM part 130 AC adapter 131 Regulator 150 Inverter circuit 151,152,153,154 Inverter 155 Backlight lighting device 160 External input 161 Antenna 162 Tuner 163 Program information separation unit (part of program information acquisition means)
164 Decoding unit 165 Broadcast content detection unit (program information acquisition means)
166 operation unit (part of viewing reservation program setting means)
167 Display control unit (image display control means, priority order setting means)
168 LCD controller 169 Liquid crystal drive circuit 170 Broadcast screen 171 Message indicating that viewing cannot be made until the end of the reserved viewing program 175 Electronic program guide 176, 177 Reserved viewing program 1000 Data slicer processing section (program information acquisition means)

Claims (15)

A display device comprising a liquid crystal panel and an illumination light source unit that illuminates the liquid crystal panel,
An electronic program guide acquisition means for acquiring an electronic program guide;
Viewing program reservation means for reserving a viewing program based on the acquired electronic program guide;
A display device comprising: an image display control unit configured to control display characteristics of the liquid crystal panel or the illumination light source unit based on a reservation status relating to a reserved viewing reservation program. A display device comprising a liquid crystal panel and an illumination light source unit that illuminates the liquid crystal panel,
An electronic program guide acquisition means for acquiring an electronic program guide;
Viewing program reservation means for reserving a viewing program based on the acquired electronic program guide;
Image display control means for controlling display characteristics based on at least one of the brightness of the display of the liquid crystal panel, the spatial resolution of the liquid crystal panel, and the temporal resolution based on the reservation status of the reserved viewing reservation program. A display device comprising:   3. The display device according to claim 1, wherein the display brightness control of the liquid crystal panel includes a control for changing a luminance of the illumination light source unit according to the reservation status. 4.   4. The display device according to claim 1, wherein the control of the spatial resolution includes a control of changing a size of an image to be displayed on the liquid crystal panel according to the reservation status. 5.   5. The display device according to claim 1, wherein the control of the time resolution includes a control of changing a frame frequency of the liquid crystal panel according to the reservation status. 6.   The display device according to claim 1, wherein the image display control unit performs partial lighting or extinguishing of the illumination light source unit according to the reservation status. Furthermore, a battery for driving the display device, and a battery remaining amount detecting means for detecting the remaining capacity of the battery,
The display device according to claim 1, wherein the image display control unit performs image display control based on the reservation status and the detected remaining capacity of the battery.   The display device according to any one of claims 1 to 7, wherein the reservation status includes a reservation time of a viewing reservation program or a total time of reserved programs.   The said image display control means performs control which maintains the said display characteristic to a reference | standard level within the broadcast time of the said viewing-and-listening reservation program reserved. Display device.   The said image display control means performs control which raises the said display characteristic from a reference level within the broadcast time of the said reservation program for viewing reservations, The one of Claim 1-9 characterized by the above-mentioned. The display device described.   The said image display control means performs control which lowers | hangs the said display characteristic from a reference level about programs other than the said reserved viewing reservation program, The one of Claim 1-10 characterized by the above-mentioned. Display device. Furthermore, it comprises priority order setting means for setting priorities for the reserved viewing reservation program,
The display device according to claim 1, wherein the image display control unit performs image display control in accordance with the set priority order.   A television receiver comprising the display device according to any one of claims 1 to 12. A control method for a display device comprising a liquid crystal panel and an illumination light source unit for illuminating the liquid crystal panel,
Obtaining an electronic program guide;
Reserving a viewing program based on the acquired electronic program guide;
And a step of controlling at least one of display brightness, display spatial resolution, and temporal resolution based on a reservation status related to the reserved viewing reservation program.   The program for making a computer perform the step of Claim 14.

Images