Abstract:
A display device includes: a display module; a storage module storing state setting information indicating whether setting of a power consumption state of the display module has been completed; an information readout module reading out the state setting information from the storage module at startup of the display module; a decision module deciding to set the power consumption state of the display module when the readout state setting information indicates non-setting; a display instruction module causing the display module to display a screen for setting the power consumption state in response to the decision to set the power consumption state; an input module inputting information for setting the power consumption state based on the screen displayed in the display module; and a state setting module setting the power consumption state based on the information inputted by the input module.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2008-211048, filed on Aug. 19, 2008; the entire contents of which are incorporated herein by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a display device and a display method. 
         [0004]    2. Description of the Related Art 
         [0005]    Conventionally, a technique of detecting the brightness of a room by a sensor, adjusts the luminance of the display device, and suppresses its power consumption is disclosed (see, for example, JP-B 3816667) 
         [0006]    Incidentally, lineup of various products is set for a display device displaying an image and so on in view of function and price to address needs of more consumers (users). In order to respond to the requests from the consumers wanting products at low prices, it is important to suppress the cost by providing no sensor and the like. 
       BRIEF SUMMARY OF THE INVENTION 
       [0007]    In the case of a display device including no sensor and the like, the consumer has continuously used the device without knowing the display device in a state of consuming much power. 
         [0008]    Hence, an object of the present invention is to provide a display device and a display method capable of urging use of the display device in a power-saving state 
         [0009]    A display device according to an aspect of the present invention includes: a display module configured to display an image; a storage module configured to store a state setting information indicating whether setting of a power consumption state of the display module has been completed or not; an information readout module configured to read out the state setting information from the storage module at startup of the display module; a decision module configured to decide to set the power consumption state of the display module when the readout state setting information indicates non-setting; a display instruction module configured to cause the display module to display a screen for setting the power consumption state of the display module in response to that the decision module has decided to set the power consumption state of the display module; an input module configured to input information for setting the power consumption state of the display module based on the screen displayed in the display module; and a state setting module configured to set the power consumption state of the display module based on the information inputted by the input module. 
         [0010]    A display method according to an aspect of the present invention is a display method in a display device including a display module which displays an image, the method including: reading out an state setting information indicating whether setting of a power consumption state of the display module has been completed or not from a storage module at startup of the display module; deciding to set the power consumption state of the display module when the readout state setting information indicates non-setting; causing the display module to display a screen for setting the power consumption state of the display module in response to the decision to set the power consumption state of the display module; inputting information for setting the power consumption state of the display module based on the displayed screen; and setting the power consumption state of the display module based on the inputted information. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]      FIG. 1  is a block showing a configuration of a liquid crystal display device  1  according to a first embodiment. 
           [0012]      FIG. 2  is a conceptual chart showing a table T 1  to be stored in a memory module  62  included in the liquid crystal display device  1 . 
           [0013]      FIG. 3  is a conceptual view showing a power-saving setting menu M 1  displayed on a liquid crystal panel  21 . 
           [0014]      FIG. 4  is a flowchart showing the operation of the liquid crystal display device  1 . 
           [0015]      FIG. 5  is a conceptual chart showing a table T 2  stored in the memory module  62 . 
           [0016]      FIG. 6  is a conceptual view showing a power-saving setting menu M 2  displayed on the liquid crystal panel  21 . 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     First Embodiment  
       [0017]    Hereinafter, a liquid crystal display device  1  according to a first embodiment of the present invention will be described in detail with reference to the drawings.  FIG. 1  is a block diagram showing a configuration of the liquid crystal display device  1 .  FIG. 2  is a conceptual chart showing a table T 1  to be stored in a memory module  62  included in the liquid crystal display device  1 . 
         [0018]    The liquid crystal display device  1  includes a power supply module  10 , a display module  20 , a light source unit  30 , a video signal receiving module  40 , an input module  50 , a video control module  60 , and an audio reproduction module  70 . 
         [0019]    The power supply module  10  includes a power supply line  11  via which power is supplied to the parts in the liquid crystal display device  1 . The power supply line  11  is connected to a not-shown commercial power supply. 
         [0020]    The display module  20  is mainly composed of a liquid crystal panel  21 , a gate driver  22 , and a source driver  23 . 
         [0021]    The liquid crystal panel  21  is constituted to have a liquid crystal material sandwiched between two sheets of glass, though not shown in particular, on which scan lines and data lines are arranged, respectively. The scan lines and data lines intersect to each other and are driven by the gate driver  22  and the source driver  23 . Locations where the scan lines and the data lines intersect correspond to pixels. Application of a voltage to the scans line and the data lines causes the pixels to emit colors R, G and B respectively to thereby display a color image on the liquid crystal panel  21 . Controlling the magnitude of the voltage applied to the scan lines and the data lines can control the color tone and the like of R, G and B in each of the pixels. 
         [0022]    The gate driver  22  sequentially outputs a voltage waveform in a pulse form to the scan lines. The source driver  23  outputs a voltage waveform in a pulse form to the signal lines in response to the output of the voltage waveform in a pulse form from the gate driver  22 . 
         [0023]    The light source unit  30  has a light source  31  and a light adjustment module  32 , and supplies light to the display module  20 . The light source unit  30  is disposed behind the display module  20 , in particular, the later-described liquid crystal panel  21 . Between the light source unit  30  and the liquid crystal panel  21 , a pair of diffuser plates and a prism sheet sandwiched between the diffuser plates are provided though not shown. The diffuser plates scatter and diffuse the light from the light source unit  30  to prevent occurrence of unevenness in brightness of the light supplied to the display module  20 . The prism sheet is for improving the luminance of the light supplied from the light source unit  30 . 
         [0024]    One example of the light source  31  is a plurality of cold cathode fluorescent lamps (CCFL) which are fluorescent tubes having a long product life and a low power consumption. Other examples of the light source  31  include light emitting elements such as a light emitting diode (LED), an organic electro luminescence (EL), an inorganic EL, a laser diode. 
         [0025]    The light adjustment module  32  is controlled by the video control module  60 , to adjust the light of the light source  31 . For example, when the light source  31  is a cold cathode fluorescent lamp, the light adjustment module  32  individually control turning on and turning off of the plurality of cold cathode fluorescent lamps. Further, the light adjustment module  32  can supply a voltage or a current in a pulse form to the cold cathode fluorescent lamp to periodically turn on or turn off the illumination by the cold cathode fluorescent lamp, and to adjust the light while controlling the allocation of the turn-on period and the turn-off period of the cold cathode fluorescent lamp. By changing the duty ratio of the pulse waveform, the allocation of the turn-on period and the turn-off period is changed. For example, the light adjustment module  32  adjusts the brightness of the cold cathode fluorescent lamp to maximum by continuously turning on the cold cathode fluorescent lamp. The light adjustment module  32  adjusts the cold cathode fluorescent lamp to a medium brightness by setting the duty ratio of the pulse waveform relatively large, and adjusts the cold cathode fluorescent lamp to a lower brightness by setting the duty ratio relatively small. 
         [0026]    For example, when the light source  31  is a light emitting element such as an LED or the like, the light adjustment module  32  adjusts the voltage to be applied to the light emitting element to directly vary the luminance of the light emitting element. 
         [0027]    The adjustment by the light adjustment module  32  increases or decreases the power consumption of the entire light source unit  30 . The power consumption increases when the light is adjusted to increase the luminance of the light to be supplied to the display module  20 . Conversely, the power consumption decreases when the light is adjusted to decrease the luminance of the light to be supplied to the display module  20 . Note that the image to be displayed on the liquid crystal panel  21  becomes brighter with an increase in luminance of the light supplied to the display module  20 . 
         [0028]    The video signal receiving module  40  receives various video signals (signals containing image data and audio data) from the outside of the liquid crystal display device  1  and outputs the received video signals to the video control module  60 . 
         [0029]    “Image data” contained in the video signal is composed of pixel data for R, G, and B. The pixel data for R, G, and B correspond to the pixels of the liquid crystal panel  21 , respectively. The image data has a luminance value as information indicating the brightness of each of the pixels. 
         [0030]    The video signal receiving module  40  includes an image receiving interface  41  and a tuner unit  42 . 
         [0031]    The image receiving interface  41  includes an HDMI (High-Definition Multimedia Interface) terminal, a component terminal, a composite terminal and so on, and to which the liquid crystal display device  1  and the external connection device (for example, a DVD player, a DVD recorder, a PC) and so on are connected. 
         [0032]    The tuner unit  42  is connected a not-shown antenna or the like to receive various video signals on a terrestrial analog wave, a terrestrial digital wave, a wave for satellite broadcasting and so on. 
         [0033]    The input module  50  is operated by a user to output, to the video control module  60 , information indicating On/Off of the power supply of the liquid crystal display device  1  and information for selecting a button displayed as an image on the liquid crystal panel  21 . 
         [0034]    The input module  50  includes a control panel  51  and an infrared receiving module  52 . The control panel  51  is, for example, a touch panel, a press-type button group, a keyboard or the like. The infrared receiving module  52  receives a command from a not-shown remote controller on which buttons conforming to the control panel  51  are mounted. 
         [0035]    The video control module  60  controls the display module  20 , the light source unit  30 , the audio reproduction module  70  and so on. Concretely, the video control module  60  causes the display module  20  to display an image. The light source unit  30  varies the luminance of the light to be supplied to the display module  20 . The video control module  60  causes the display module  20  to display a power-saving setting menu M 1  for varying the luminance of the light to be supplied to the display module  20 . The video control module  60  causes the audio reproduction module  70  to emit audio. 
         [0036]    The video control module  60  includes a menu creation module  61 , a memory module  62 , a control module  63 , a light source control module  64 , a video control module  65  and an audio control module  66 . 
         [0037]    The menu creation module  61  creates the power-saving setting menu M 1 . The “power-saving setting menu M 1 ” is for the user to adjust the hue and the tone of the image to be displayed in the display module  20  and the luminance of the light to be supplied to the display module  20  by the light source unit  30  in accordance with the use environment of the liquid crystal display device  1 . 
         [0038]    In the memory module  62 , program, table T 1 , state setting information, set video mode information and so on are stored. 
         [0039]    The “program” is information to be read into the control module  63  at the system startup of the liquid crystal display device  1 . In the program, control information for the entire liquid crystal display device  1  is described. 
         [0040]    In the “table  1 ,” a video mode and parameters of image quality including contrast, backlight, brightness, color, and hue which are set for each video mode are shown corresponding to each other (see  FIG. 2 ). 
         [0041]    The “video mode” is classified into two modes of “Sports” and “Standard.” The parameters of image quality are previously allocated to each of these classifications. The “Sports” mode is optimized for display at appliance dealers and the like, and is to supply the light with the highest luminance to the display module  20 . In the “Sports” mode, the light source  31  is turned on while consuming the highest power. The “Standard” mode is optimized, for example, for use in a typical house and is to supply the light with a luminance lower than that of the “Sports” mode to the display module  20 . The light source  31  is turned on while consuming the power consumption lower in the “Standard” mode than in the “Sports” mode. 
         [0042]    The parameters of image quality define the hue and the tone of the image to be displayed on the liquid crystal panel  21  and the luminance of the light to be supplied from the light source unit  30  to the display module  20 . 
         [0043]    The larger the parameter corresponding to “contrast” is, the larger the difference between the luminance value for the brightest image and the luminance value for the darkest image becomes, resulting in a sharp image displayed on the liquid crystal panel  21 . 
         [0044]    The parameter corresponding to “backlight” (1 to 100) indicates the percentage (%) of the luminance of the light to be supplied to the display module  20  to the maximum luminance of the light source unit  30  which can be supplied to the display module  20 . In the “Standard” mode, the light with a luminance about half that in the “Sports” mode is supplied to the display module  20 . 
         [0045]    The larger the parameter corresponding to “brightness” is, the brighter the color of the image to be displayed on the liquid crystal panel  21  becomes. 
         [0046]    The larger the parameter corresponding to “color” is, the stronger and thicker the tone (the strength of color and the appearance of shading) of the image displayed on the liquid crystal panel  21  becomes. 
         [0047]    The larger the parameter corresponding to “hue” is, the more reddish the tint (color balance) of the image displayed on the liquid crystal panel  21  becomes, whereas the smaller the parameter is, the more bluish the tint becomes. 
         [0048]    The “state setting information” indicates whether or not the power consumption state is set. 
         [0049]    The “set video mode information” indicates a set video mode when the power consumption state is set. 
         [0050]    The control module  63  functions as an information readout module, a decision module, a display instruction module, and a state setting module. 
         [0051]    The control module  63  controls the modules such as the light source control module  64 . Into the control module  63 , the video signal outputted from the video signal receiving module  40  is inputted. The control module  63  takes image data and audio data out from the inputted video data, and outputs the data to the video control module  65  and the audio control module  66 , respectively. 
         [0052]    The control module  63  controls the light source control module  64  to perform instruction of turning on and light adjustment of the light source  31 . The control module  63  is monitoring the presence or absence of supply of power from the power supply module  10 . When receiving supply of power from the power supply module  10 , the control module  63  refers to the state setting information stored in the memory module  62 . 
         [0053]    The control module  63  decides whether to execute the setting of the power consumption state of the display module  20  (the setting and change of the video mode) based on the referred state setting information. 
         [0054]    When the referred state setting information is non-setting indicating that the power consumption state has not been set yet, the control module  63  causes the menu creation module  61  to create the power-saving setting menu M 1 . The control module  63  outputs the created power-saving setting menu M 1  as image data to the video control module  65 . 
         [0055]    The control module  63  is monitoring the input from the input module  50  at all times. The control module  63  reads the parameters of image quality corresponding to the video mode selected by the input module  50  based on the power-saving setting menu M 1  displayed on the liquid crystal panel  21 , and outputs the parameters to the video control module  65  and the light source control module  64 . Concretely, the control module  63  outputs the parameter of “backlight” to the light source control module  64 , and outputs the parameters other than that of “backlight” to the video control module  65 . 
         [0056]    The light source control module  64  calculates the luminance of the light to be supplied to the display module  20  based on the parameters of image quality outputted from the control module  63 , outputs the luminance to the light adjustment module  32  to control turning-on/off of the light source  31  and the light adjustment. For example, when a parameter (100) of “backlight” in the “Sports” is outputted, the light source control module  64  calculates a luminance value so that the light with the highest luminance is supplied to the display module  20  from the light source unit  30 , and outputs the luminance value to the light adjustment module  32 . For example, when the light source  31  is turned on using a parameter (50) in the “Standard,” the light with a luminance about half the whole is emitted from the light source unit  30  as a result. In this event, the power consumed in the light source unit  30  is reduced. 
         [0057]    The video control module  65  controls the gate driver  22  and the source driver  23  to cause them to display the image corresponding to the image data outputted from the control module  63 , on the liquid crystal panel  21 . 
         [0058]    The video control module  65  has an image memory (not shown) which temporarily stores image data. The image data written into the image memory is displayed as an image on the liquid crystal panel  21 . 
         [0059]    The video control module  65  controls the gate driver  22  and the source driver  23  to cause them to set the transmittance through the pixels of the liquid crystal panel  21  to realize the luminance value of the pixels constituting the image data outputted from the control module  63 . 
         [0060]    The video control module  65  changes the luminance value of the pixels constituting the image data by calculation based on the parameters of image quality outputted from the control module  63 . The gate driver  22  and the source driver  23  are controlled to realize the changed luminance value, with the result that an image with a higher contrast or a whitish image (with a higher brightness) than that of the image corresponding to the original image data outputted from the control module  63  is displayed on the liquid crystal panel  21 . 
         [0061]    The audio control module  66  outputs audio taken out of the video signal to the audio reproduction module  70 . 
         [0062]    The audio reproduction module  70  includes an amplifier module  71  and a speaker  72 , and generates audio based on the audio data outputted from the audio control module  66 . 
         [0063]    Next, the power-saving setting menu M 1  displayed on the liquid crystal panel  21  will be described with reference to  FIG. 3 .  FIG. 3  is a conceptual view showing the power-saving setting menu M 1  displayed on the liquid crystal panel  21 . 
         [0064]    The liquid crystal panel  21  includes selection button screens  101  and  102 , a pointer  103  (a thick frame on the selection button screen  101 ), and an explanation window  104 , as the power-saving setting menu M 1 . 
         [0065]    In the selection button screens  101  and  102 , “Retail” and “Home” are displayed respectively, which are selected by the pointer  103 . “Retail” and “Home” are associated with “Sports” and “Standard” in the table T 1 , respectively. 
         [0066]    In the explanation window  104 , information for explaining to the user to select which of the selection button screens  101  and  102  is displayed. More specifically, a text is displayed to prompt the user to select “Retail” (the selection button screen  101 ) for use as a monitor at shops, whereas a text is displayed to recommend the user to select “Home” (the selection button screen  102 ) for use at home. In this event, when “Home” is selected, a text is also displayed that the liquid crystal display device  1  conforms to ENERGY STAR (registered trademark). Note that ENERGY STAR is a power-saving program for n electric devices promoted by US Environmental Protection Agency (EPA). Though a text in English is displayed here in the explanation window  104 , the text is not limited to this but can be displayed in a language corresponding to a nation where the liquid crystal display device  1  is used. 
         [0067]    The pointer  103  moves over items in conjunction with the button operation of the input module  50 . A viewer can press a not-shown “decision button” of the input module  50  when the pointer  103  overlaps an arbitrary item to thereby select the item. 
         [0068]    Next, the operation of the liquid crystal display device  1  configured as described above will be described using  FIG. 4 .  FIG. 4  is a flowchart showing the operation of the liquid crystal display device  1 . 
       (1) Power Supply On (Step S 101 ) 
       [0069]    The user presses the power supply button of the input module  50 , whereby power is supplied to the modules. 
       (2) Check State Setting Information (Step  102 ) 
       [0070]    When receiving supply of power, the control module  63  refers to the memory module  62  and reads the program for processing in Step S 102  and thereafter. 
         [0071]    The control module  63  then refers to the state setting information stored in the memory module  62  following the read program. 
       (3) Set Video Mode (Step S 103 ) 
       [0072]    When the state setting information is non-setting in Step S 102 , the control module  63  causes the menu creation module  61  to create the power-saving setting menu M 1 . The control module  63  controls the video control module  65  to display the created power-saving setting menu M 1  on the display module  20 . 
       (4) Set Video Mode (Steps S 104  to S 108 ) 
       [0073]    The control module  63  receives information indicating the button selected by the user from the input module  50  based on the power-saving setting menu M 1  displayed in the display module  20  (Steps S 104  and S 105 ). 
         [0074]    The control module  63  refers to the table T 1  in the memory module  62  for a video mode corresponding to the information indicating the button selected by the user contained in the received information, and sets the video mode as a video mode thereafter (Steps S 106  and S 107 . 
         [0075]    The control module  63  causes the memory module  62  to store the state setting information indicating “completion” and the set video mode information indicating the set video mode (Step S 108 ). 
       (5) Set Previous Video Mode (Step S 109 ) 
       [0076]    When the state setting information indicates “completion” in Step S 102 , the control module  63  refers to the memory module  62  and retrieves the set video mode information. 
         [0077]    More specifically, the case where the state setting information indicates “completion” means that the operation mode has been already set, and therefore the control module  63  refers to the set video mode information stored in the memory module  62 , and keeps the previously set video mode as the video mode continuously thereafter. 
       (6) Read Out Parameters (Step S 110 ) 
       [0078]    The control module  63  then refers to the table T 1  in the memory module  62 , and reads out parameters of image quality corresponding to a newly set or the previously set video mode. 
       (7) Light Adjustment Processing (Step S 111 ) 
       [0079]    The control module  63  outputs the parameters of image quality corresponding to the backlight read out in Step S 110  to the light source control module  64 . The light source control module  64  calculates the luminance value of the light to be supplied to the display module  20  based on the received parameters of image quality corresponding to the backlight, and controls the light adjustment module  32  so that the light with the calculated luminance is supplied to the display module  20 . 
       (8) Video Display Processing (Step S 112 ) 
       [0080]    The control module  63  outputs the image data contained in the video signal outputted from the video signal receiving module  40  and the parameters of image quality read out in Step S 110  to the video control module  65 . 
         [0081]    The video control module  65  calculates the luminance value of the image to be displayed on the display panel  21  based on the image data and the parameters of image quality outputted from the control module  63 , and generates image data having the calculated luminance value. 
         [0082]    The video control module  65  controls the gate driver  22  and the source deriver  23  to cause them to display an image corresponding to the generated image data on the liquid crystal panel  21 . In this event, the brightness of the image displayed on the liquid crystal panel  21  is different depending on the brightness of the light source  32  which has been subjected to light adjustment in Step S 111 . 
         [0083]    A conventional liquid crystal display device has often automatically operated in the “Sports” mode when the state setting information is non-setting (for example, when the power is turned on for the first time after factory shipment). 
         [0084]    The liquid crystal display device  1  according to this embodiment can urge the user to use the video mode in which the liquid crystal display device  1  operates with reduced power, by displaying the power-saving setting menu M 1  when the state setting information is non-setting at the startup of the system, and thereby prevent the liquid crystal display device  1  from being continuously used in a state using much power to reduce the power consumption. 
         [0085]    Further, the liquid crystal display device  1  can urge the user to make the setting to create a bright and vivid video for use at shops, whereas can urge the user to make the setting to create a video with an appropriate brightness for use in a typical house. 
       Other Embodiments  
       [0086]    Though the liquid crystal display device  1  according to one embodiment of the present invention has been described above, the present invention is not limited only to the above-described embodiment, but can be variously modified without departing from the spirit of the present invention. For example, the input module  50  may include a button to clear the state setting information indicating “completion” stored in the memory module  62  (namely, into the state of “non-setting”). In the case where the state setting information indicating “completion” is cleared, when the power supply of the liquid crystal display device  1  is turned on, the power-saving setting menu M 1  is displayed on the liquid crystal panel  21 , so that the processing of setting the video mode is performed again. 
         [0087]    Further, though the video mode is classified into two modes such as the “Sports” mode and the “Standard” mode in the above-described embodiment, the video mode can also be classified into a plurality of modes. 
         [0088]    An example in which the video mode is classified into a plurality of modes will be described using  FIG. 5 .  FIG. 5  is a conceptual chart showing a table T 2  stored in the memory module  62 . Note that in the following description, description of the same portion as in the first embodiment will be omitted. 
         [0089]    In the table T 2 , the video modes are shown associated with parameters of image quality including contrast, backlight, brightness, color, and hue which are set for each of the video modes as in the table T 1 . The table T 2  is stored in the memory module  62  in place of the table T 1 . 
         [0090]    The “video mode” is classified into “Sports,” “Standard,” “Movie,” and “Preference.” The “Sports” and “Standard” are the same as those in the table T 1  and therefore description thereof will be omitted. 
         [0091]    The “Movie” mode is optimized, for example, for use in a typical house similarly to the “Standard” mode. Further, the “Movie” mode is optimized for viewing movies in which light with a luminance lower than that in the “Standard” mode is supplied to the display module  20 . In the “Movie” mode, the light source  31  is turned on with a power consumption lower than that in the “Standard” mode. 
         [0092]    As the parameters in the “Preference” mode, values appropriately set by the user using the input module  50  are applied. For example, the user can press a not-shown button for adjusting the video mode of the input module  50  to set the parameters. In this event, the control module  63  stores the set parameters into the table T 2  as the setting of the “Preference” mode. Note that as initial values of the parameters of the “Preference” mode, numeric values as those in the “Standard” are applied. 
         [0093]    The menu creation module  61  creates a power-saving setting menu M 2  corresponding to the modes of “Sports,” “Standard,” “Movie,” and “Preference” in the table T 2 . 
         [0094]    Next, the power-saving setting menu M 2  displayed on the liquid crystal panel  21  will be described with reference to  FIG. 6 .  FIG. 6  is a conceptual view showing the power-saving setting menu M 2  displayed on the liquid crystal panel  21 . 
         [0095]    The liquid crystal panel  21  includes selection button screens  201  to  204 , a pointer  103  (a thick frame on the selection button screen  201 ), and an explanation window  205  as the power-saving setting menu M 2 . 
         [0096]    The selection button screens  201  to  204  are displayed as “Sports (high power consumption),” “Standard (low power consumption),” “Movie (minimum power consumption),” and “Preference (arbitrary setting)” respectively, and selected by the pointer  103 . 
         [0097]    The selection button screens  201  to  204  are associated with “Sports,” “Standard,” “Movie,” and “Preference” in the table T 2 , respectively. 
         [0098]    In the explanation window  205 , information for explaining to the user to select which of the selection button screens  201  to  204 . 
         [0099]    More specifically, a text is displayed to prompt the user to select “Sports” (the selection button screen  201 ) for use as a monitor at shops, a text is displayed to select “Standard” (the selection button screen  202 ) or “Movie” (the selection button screen  203 ) for use in a typical house, where as a text is displayed to recommend the user to select “Preference” (the selection button screen  204 ) for other cases. 
         [0100]    In this event, when “Standard” or “Movie” is selected, a text is also displayed that the liquid crystal display device  1  conforms to ENERGY STAR. 
         [0101]    Note that the operation of the liquid crystal display device  1  when the table T 2  is stored in the memory module  62  is substantially the same as that in the first embodiment, and therefore the detailed description thereof will be omitted here. 
         [0102]    As described above, the power-saving setting menu M 2  is displayed on the liquid crystal panel  21 , whereby the user can select an arbitrary video mode. 
       Other Embodiments  
       [0103]    Embodiments of the present invention are not limited to the above-describe embodiments, but can be extended or changed, and the extended and changed embodiments are also included in the technical scope of the present invention.