Abstract:
Disclosed herein is an information display apparatus for displaying an image received from an image supplying source on an image display section after carrying out a conversion process on the image in an image conversion section employed in the information display apparatus on demand. The information display apparatus may include a timing storage section, an image determination section, and an output-path switching section.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority from Japanese Patent Application No. JP 2006-062992, filed in the Japanese Patent Office on Mar. 8, 2006, the entire content of which is incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an image display apparatus and an image display method, which are used for displaying an image based on image data received typically from an image supplier. 
     2. Description of the Related Art 
     There has been provided a standard named a DDC (Display Data Channel) standard as a standard, which should be called a plug-and-play for an image display apparatus. In accordance with the DDC standard, information on attributes of the image display apparatus is supplied by the image display apparatus to a host, which is an apparatus supplying an image signal, and the host automatically does setting adjusted to the characteristics of the image display apparatus. An example of the attributes of the image display apparatus is an optimum resolution. 
     In accordance with the DDC standard, information on characteristics of the image display apparatus is supplied by the image display apparatus to a host in the form of data having a format called an EDID (Extended Display Identification Data) format. Even with the power supply of the image display apparatus turned off, the host supplies power to the image display apparatus so that the image display apparatus is capable of transmitting the EDID data to the host. It is thus necessary to store the EDID data in a nonvolatile memory such as an EEPROM in order to prevent the EDID data from being lost even if the power supply of the image display apparatus is turned off. 
     In the past, an image output apparatus conforming to the DDC standard was computers only. The types of resolution of an RGB signals output by the computer are VGA (640×480), SVGA (800×600), XGA (1280×768), SXGA (1280×1024) and QXGA (2048×1536). Thus, for example, the EDID data stored in the nonvolatile memory of the conventional image display apparatus conforming to the DDC standard as data related to the resolution is a recommendation saying that SVGA is the optimum type of resolution for the RGB signals. 
     In addition, there has been proposed a display system in which, when an image output by a personal computer is displayed on a display unit, a technique of transmitting the data of the received image and the attributes of the image such as the resolution and frame rate of the image are identified by carrying out a format conversion process, and the data of the image is processed in accordance with the technique and the characteristics. If the technique of transmitting the data of the image received and the attributes of the image are not appropriate, the personal computer is requested to retransmit the EDID data. For more information on the proposed display system, refer to information sources such as paragraph [0041] and FIG. 1, which are included in Japanese Patent Laid-open No. 2001-265313. This document is taken as Patent Document 1. 
     SUMMARY OF THE INVENTION 
     A frame conversion process described in Patent Document 1 cited above is carried out to convert image data received from the personal computer into an image with a refresh rate higher than a frame rate adopted in an image display apparatus as the normal frame rate of 60 Hz. By outputting the image obtained as a result of the frame conversion process to an LCD panel of the display unit, the degree of blurring peculiar to a moving picture can conceivably be lowered. 
     In order to implement a process to convert image data received from the personal computer into an image with a high refresh rate by carrying out the frame conversion process in the image display apparatus, however, it is necessary to provide the image display apparatus with a buffer memory and an interpolation circuit for generating an interpolation frame by making use of the data of the input image. 
     In addition, in the frame conversion process carried out in the image display apparatus, it is necessary to save image data of frames leading ahead of and lagging behind an input image, insert data of an interpolation frame between frames of the saved image data and compute data of an image to be displayed. The computation process carried out in the image display apparatus causes a delay of the output image from the input image. 
     Image data output by the personal computer obtained as a result of executing an application program such a game played by the user carrying out interactive operations has a problem caused by a delay of a movement of an image appearing on a display screen from an input operation carried out by the user on an image output by the personal computer. The problem causes inconvenience that the image cannot be well used in the game. 
     Addressing the problems described above, inventors of the present invention have innovated an information display apparatus and an information display method both capable of smoothly displaying a moving image without requiring a special buffer memory, an interpolation circuit and an interpolation process, which are necessary for image conversion processing carried out in the image display apparatus, and without raising a problem caused by a delay of a movement of an image appearing on a display screen from an image output by a personal computer serving as the host of the image display apparatus. 
     In order to solve the above problems, in accordance with an embodiment of the present invention, there is provided an information display apparatus which may have a timing storage section configured to store timing data which shows at least an image supplied by the image supplying source with a predetermined timing; an image determination section for producing a result of determination as to whether or not the image supplied by the image supplying source is based on the timing data; and an output-path switching section for changing an output path of the image received from the image supplying source in order to supply the image received from the image supplying source to an image display section as it is without driving an image conversion section to carry out a conversion process on the image received from the image supplying source to convert the image received from the image supplying source into an output image compatible with the image display section if the determination result produced by the image determination section indicates that the image received from the image supplying source is based on the timing data. 
     As described above, the timing storage section may be used for storing at least timing data showing a predetermined timing with which an image supplied by the image supplying source is to be displayed, and the image determination section may produce a result of determination as to whether or not the image supplied by the image supplying source is based on the timing data. 
     Then, if the determination result produced by the image determination section indicates that the image received from the image supplying source is based on the timing data, the output-path switching section may change the output path of the image received from the image supplying source in order to supply the image received from the image supplying source to the image display section as it is without driving the image conversion section to carry out a conversion process on the image received from the image supplying source in order to convert the image received from the image supplying source into an output image compatible with the image display section. 
     Thus, the timing data stored in the timing storage section is timing data having a highest refresh rate at which an image is to be displayed on the image display section. If the timing data stored in the timing storage section is timing data for a plug-and-play for outputting a timing for a high refresh rate, by electrically connecting the image display apparatus to the image supplying source by a cable, the timing data can be supplied in advance from the image display apparatus to the image supplying source. 
     Thus, if the image supplying source provides the image display apparatus with an image, which has a high refresh rate and can be displayed on the image display section as it is without driving the image conversion section to carry out a conversion process on the image in order to convert the image into an output image compatible with the image display section, the image display apparatus may be capable of displaying a blurring-free output image at the high refresh rate on the image display section without requiring a special buffer memory and an interpolation circuit. 
     In addition, in accordance with another embodiment of the present invention, there is provided an information display method which may include driving an image supplying source to recognize an image display unit; reading out timing data from a memory of the image display unit as data to be used as a basis for displaying an image received from the image supplying source as an image having a predetermined timing required by the image supplying source; outputting the image having the predetermined timing required by the image supplying source to the image display unit; producing a result of determination as to whether or not the image supplied by the image supplying source is based on the timing data; and changing an output path of the image received from the image supplying source in order to supply the image received from the image supplying source to the image display unit as it is without carrying out a conversion process on the image received from the image supplying source to convert the image received from the image supplying source into an output image compatible with the image display unit if the result of the determination indicates that the image received from the image supplying source is based on the timing data. 
     As described above, first of all, the image supplying source may recognize the image display unit. Then, timing data may be read out from a memory of the image display unit as data to be used as a basis for displaying an image received from the image supplying source as an image with a predetermined timing required by the image supplying source. Subsequently, the image may be output with the predetermined timing required by the image supplying source to the image display unit. 
     Then, the image supplied by the image supplying source may be examined in order to produce a result of determination as to whether or not the image supplied by the image supplying source is based on the timing data. Finally, if the result of the determination indicates that the image supplied by the image supplying source is based on the timing data, the output path of the image may be changed in order to supply the image supplied by the image supplying source to the image display unit as it is without carrying out a conversion process on the image supplied by the image supplying source in order to convert the image supplied by the image supplying source into an output image compatible with the image display unit. 
     Thus, if the timing data stored in the memory of the image display unit is timing data having a highest refresh rate for showing an image on the image display unit, the timing data can be supplied in advance from the image display unit to the image supplying source. 
     At that time, by outputting an image received from the image supplying source as an image with a high refresh rate to the image display unit as it is without carrying out a conversion process on the image, the image display unit may be capable of displaying the image received from the image supplying source at the high refresh rate without carrying out special computation processing so as to lower the degree of blurring peculiar to a moving picture. 
     In accordance with the present invention, the image display apparatus may not require a buffer memory and an interpolation circuit. Thus, the image display unit may be capable of displaying the image at the high refresh rate with a low degree of blurring caused by the high refresh rate as blurring peculiar to a moving picture. 
     In addition, the image display apparatus may not need to carryout computation processing of an interpolation process to interpolate data stored in a buffer memory. It is thus possible to shorten the time it takes to generate an output image. 
     On top of that, by transferring timing data of an image to be displayed from the image display apparatus to the image supplying source, the image supplying source may automatically output the image with a timing rate based on the timing data to the image display apparatus. Thus, the image display apparatus may not require a buffer memory and an interpolation circuit. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram showing a liquid crystal display unit according to an embodiment of the present invention and a personal computer connected to the liquid crystal display unit; 
         FIG. 2  is a block diagram showing a typical configuration of the liquid crystal display unit; 
         FIG. 3  is a block diagram showing another typical configuration of the liquid crystal display unit; 
         FIG. 4  shows a flowchart representing processing to mainly display recommended high refresh timing image data; 
         FIG. 5  shows the continuation of the flowchart shown in  FIG. 4 ; 
         FIG. 6  is a diagram showing a typical personal computer employing an LCD panel integrated therein to form a single body in accordance with another embodiment of the present invention; 
         FIG. 7  is a block diagram the configuration of a refresh-timing generation system of the typical personal computer employing an LCD panel integrated therein to form a single body; 
         FIG. 8  shows a flowchart representing processing to mainly display recommended high refresh timing image data; 
         FIG. 9  shows the continuation of the flowchart shown in  FIG. 8 ; and 
         FIG. 10  is a diagram showing a menu screen for selecting a high refresh timing. 
     
    
    
     DETAILED DESCRIPTION 
     By referring to diagrams, the following description concretely explains preferred embodiments each implementing a liquid-crystal display apparatus  2  provided by the present invention. 
       FIG. 1  is a block diagram showing the liquid-crystal display apparatus  2  according to an embodiment of the present invention and a personal computer  1  connected to the liquid-crystal display apparatus  2  as an image supplying source for supplying an image to the liquid-crystal display apparatus  2 . The liquid-crystal display apparatus  2  conforms to a DVI (Digital Visual Interface) standard, which is a standard for digital transmission of video signals. 
     The personal computer  1  also conforms to the DVI standard as well. The DVI connector of the liquid-crystal display apparatus  2  is connected to the DVI connector of the personal computer  1  by using a DVI cable  3  for connecting the personal computer  1  and the liquid-crystal display apparatus  2  to each other. It is to be noted that the DVI connector of the personal computer  1  is not shown in the figure. 
     The DVI standard requires that the DDC standard be adopted. Thus, a DVI connector has a DDC terminal for exchanging EDID data. 
       FIG. 2  is a diagram particularly showing a typical configuration of circuits employed in the liquid-crystal display apparatus  2  as circuits relevant to the embodiment of the present invention. As shown in the figure, the liquid-crystal display apparatus  2  employs a nonvolatile memory  4 , which is a nonvolatile memory conforming to the EDID format. Typically, the nonvolatile memory  4  is an EEPROM conforming to the EDID format. At the manufacturing process, timing data is stored in advance in the nonvolatile memory  4  as data representing a predetermined timing with which data received from the personal computer  1  is to be displayed on an LCD (Liquid-Crystal Display) panel  11  employed in the liquid-crystal display apparatus  2  as an image display unit. 
     The timing data stored in advance in the nonvolatile memory  4  typically represents a recommended timing. For example, the timing data is high refresh timing data  12  including a resolution of 1280×1024 and a refresh frequency of 100 Hz, which is higher than the normal refresh rate of 60 Hz. In addition, the timing data also includes timing data such as a synch width, a front porch and a back porch, representing positions on the display screen of an image based on a video signal in one horizontal period. 
     The personal computer  1  connected to the liquid-crystal display apparatus  2  as an image supplying source typically retrieves the high refresh timing data  12  including the resolution of 1280×1024 and the high refresh frequency of 100 Hz from the liquid-crystal display apparatus  2 , outputting high refresh timing image data  13  with a refresh timing specified in the high refresh timing data  12  as a timing corresponding to the resolution of 1280×1024 and the high refresh frequency of 100 Hz. 
     To be more specific, the personal computer  1  outputs the high refresh timing image data  13  to the scaler  5  employed in the liquid-crystal display apparatus  2 . The scaler  5  employs an image conversion unit  8  for converting the frequency and resolution of image data in the liquid-crystal display apparatus  2 . The scaler  5  also employs a discrimination switch  6  and an output switch  9 . A CPU  7  also employed in the scaler  5  executes control to connect a movable contact point a of the discrimination switch  6  to a fixed contact point b or c of the discrimination switch  6 . By the same token, the CPU  6  also executes control to connect a movable contact point a of the output switch  9  to a fixed contact point b or c of the output switch  9 . 
     When the CPU  7  employed in the liquid-crystal display apparatus  2  recognizes the resolution and refresh frequency of the received high refresh timing image data  13  to be the resolution of 1280×1024 and the high refresh frequency of 100 Hz respectively, the CPU  7  executes control to connect the movable contact point a of the discrimination switch  6  to the fixed contact point b of the discrimination switch  6  and control to connect the movable contact point a of the output switch  9  to the fixed contact point b of the output switch  9 . 
     Thus, the output switch  9  outputs the high refresh timing image data  13  to an LCD driver  10  employed in the liquid-crystal display apparatus  2  as it is without driving an image conversion unit  8  employed in the scaler  5  to scale the resolution and the high refresh frequency. That is to say, the output switch  9  outputs high refresh timing image data  14 , which also has the resolution of 1280×1024 and the high refresh frequency of 100 Hz to the LCD driver  10 . 
     The LCD driver  10  outputs a high refresh timing image driving signal  15  having the resolution of 1280×1024 and the high refresh frequency of 100 Hz to the LCD panel  11  employed in the liquid-crystal display apparatus  2 . The LCD panel  11  then displays an image with a high refresh timing adopted as it is. At that time, the refresh rate is higher than the normal one. Thus, it is possible to display the image at the high refresh rate with an extremely low degree of blurring peculiar to a moving picture without carrying out an interpolation process. 
     When the personal computer  1  provides the liquid-crystal display apparatus  2  with image data generated by the personal computer  1  as data not compatible with the high refresh timing data  12  retrieved by the personal computer  1  from the liquid-crystal display apparatus  2 , on the other hand, the image data supplied by the personal computer  1  to the liquid-crystal display apparatus  2  is regarded as data based on normal refresh timing data. In this case, the CPU  7  recognizes the resolution and refresh frequency of image data received from the personal computer  1  to be a resolution of 1024×768 and the normal refresh frequency of 60 Hz respectively, executing control to connect the movable contact point a of the discrimination switch  6  to the fixed contact point c of the discrimination switch  6  and control to connect the movable contact point a of the output switch  9  to the fixed contact point c of the output switch  9 . 
     Thus, the output switch  9  outputs refresh timing image data obtained as a result of a process carried out by the image conversion unit  8  to scale the frequency and resolution of the image data received from the personal computer  1  to the LCD driver  10 . The refresh timing image data output by the output switch  9  to the LCD driver  10  as image data proper for the liquid-crystal display apparatus  2  is image data having a resolution of 1280×1024 and the normal refresh frequency of 60 Hz. 
     Receiving the image data from the output switch  9 , the LCD driver  10  supplies a refresh timing image driving signal  15  having the resolution of 1280×1024 and the normal refresh frequency of 60 Hz to the LCD panel  11  in order to display an image on the LCD panel  11  with this refresh timing. 
       FIG. 3  is a block diagram showing another typical configuration of the liquid crystal display unit. 
     In the case of the liquid-crystal display apparatus  2  implemented by the embodiment shown in  FIG. 2 , the scaler  5  employs the discrimination switch  6  and the output switch  9 , which are used to change the output path of image data received from the personal computer  1 , in addition to the CPU  7  for controlling the output path. In the case of the other embodiment shown in  FIG. 3  as an embodiment implementing the liquid crystal display unit, on the other hand, an output switch  24  and a discrimination circuit  25  for controlling the output path of image data are provided outside a scaler  21 . Much like the embodiment shown in  FIG. 2 , also in the case of the other embodiment shown in  FIG. 3 , the liquid crystal display unit employs a nonvolatile memory  4  inside the unit and, as a premise, operates in the same way as the embodiment shown in  FIG. 2 . 
     In the case of other embodiment shown in  FIG. 3 , when the discrimination circuit  25  employed in the liquid crystal display unit recognizes the resolution and refresh frequency of the received recommended high refresh timing image data  13  to be the resolution of 1280×1024 and the high refresh frequency of 100 Hz respectively, the discrimination circuit  25  drives the output switch  24  to connect its movable contact point a to a fixed contact point c thereof. 
     Thus, without scaling the frequency and resolution of the high refresh timing image data in the scaler  21 , the output switch  24  passes on the image data received from an A/D converter  22  by way of an interface conversion unit  23  with the resolution of 1280×1024 and the high refresh frequency of 100 Hz kept as they are to the LCD driver  10 . The A/D converter  22  is a section only for converting the high refresh timing image data  13  received as an input analog signal into digital image data whereas the interface conversion unit  23  is a section only for converting the digital image data output by the A/D converter  22  into a parallel output suitable for the LCD driver  10  to be supplied to the fixed contact point c. 
     If the discrimination circuit  25  recognizes the resolution and refresh frequency of the refresh timing image data to be respectively the resolution of 1024×768 and the refresh frequency of 60 Hz, which are a resolution and frequency not recommended by the discrimination circuit  25 , on the other hand, the discrimination circuit  25  drives the output switch  24  to connect its movable contact point a to a fixed contact point b thereof. 
     Thus, the output switch  24  provides the LCD driver  10  with image data output by the scaler  21  for carrying out a scaling process to scale the resolution and frequency of input image data as refresh timing image data having the resolution of 1280×1024 suitable for the liquid-crystal display apparatus  2  and the normal refresh frequency of 60 Hz. 
       FIGS. 4 and 5  show a flowchart representing processing carried out by the CPU  7  to mainly make the recommended high refresh timing image data displayable on the LCD panel  11  as a result of transferring EDID data from the liquid-crystal display apparatus  2  to the personal computer  1 . As shown in the figures, the flowchart of the processing begins with a step S 1  at which the CPU  7  produces a result of determination as to whether or not the power supply of the personal computer  1  has been turned on. 
     If the determination result produced at the step S 1  indicates that the power supply of the personal computer  1  has been turned on, the flow of the processing goes on to a step S 2  at which the CPU  7  produces a result of determination as to whether or not the personal computer  1  has recognized the liquid-crystal display apparatus  2 . If the determination result produced at the step S 1  indicates that the power supply of the personal computer  1  has not been turned on and the determination result produced at the step S 2  indicates that the personal computer  1  has not recognized the liquid-crystal display apparatus  2 , the processing is ended. 
     If the determination result produced at the step S 2  indicates that the personal computer  1  has recognized the liquid-crystal display apparatus  2 , on the other hand, the flow of the processing goes on to a step S 3  at which the personal computer  1  retrieves information including a recommended high refresh timing from the nonvolatile memory  4  employed in the liquid-crystal display apparatus  2 . The CPU  7  recognizes the operation carried out by the personal computer  1  to read out the information including a recommended high refresh timing from the nonvolatile memory  4 . 
     Then, at the next step S 4 , the personal computer  1  provides the liquid-crystal display apparatus  2  with requested image data having the recommended high refresh timing. 
     Subsequently, at the next step S 5 , the CPU  7  produces a result of determination as to whether or not the liquid-crystal display apparatus  2  has received the image data from the personal computer  1 . If the determination result produced at the step S 5  indicates that the liquid-crystal display apparatus  2  has received the image data from the personal computer  1 , the flow of the processing goes on to a step S 6  at which the CPU  7  identifies the input timing of the image data. 
     Then, at the next step S 7 , the CPU  7  produces a result of determination as to whether or not the input timing of the image data is the recommended high refresh timing. If the determination result produced at the step S 7  indicates that the input timing of the image data is the recommended high refresh timing, the flow of the processing goes on to a step S 8  at which the CPU  7  drives the output switch  9  to output the high refresh timing image data  13  to the LCD driver  10  employed in the liquid-crystal display apparatus  2  as it is without driving the image conversion unit  8  employed in the scaler  5  to scale the resolution and the high refresh frequency. That is to say, the output switch  9  outputs high refresh timing image data  14 , which also has the resolution of 1280×1024 and the high refresh frequency of 100 Hz to the LCD driver  10 . 
     Then, at the next step S 9 , the LCD driver  10  outputs a high refresh timing image driving signal  15  having the resolution of 1280×1024 and the high refresh frequency of 100 Hz to the LCD panel  11  employed in the liquid-crystal display apparatus  2 , which then displays an image with the recommended high refresh timing adopted as it is at the following step S 10 . 
     If the determination result produced at the step S 7  indicates that the input timing of the image data is not the recommended high refresh timing, on the other hand, the flow of the processing goes on to a step S 11  at which the CPU  7  drives the output switch  9  to output refresh timing image data obtained as a result of a process carried out by the image conversion unit  8  to scale the frequency and resolution of the image data received from the personal computer  1  to the LCD driver  10 . The refresh timing image data output by the output switch  9  to the LCD driver  10  as image data proper for the liquid-crystal display apparatus  2  is image data having a resolution of 1280×1024 and the normal refresh frequency of 60 Hz. 
     Receiving the image data from the output switch  9  at the step S 10 , the LCD driver  10  supplies a refresh timing image driving signal  15  having the resolution of 1280×1024 and the normal refresh frequency of 60 Hz to the LCD panel  11  at the next step S 12 . 
     Then, at the next step S 13 , the LCD panel  11  displays an image with this refresh timing. 
     In the embodiments described above, the personal computer  1  and the liquid-crystal display apparatus  2  are connected to each other by using the DVI cable  3 . However, the scope of the present invention is by no means limited to these embodiments. For example, the present invention can be applied to a configuration in which an LCD panel  32  can be integrated with a personal computer  31  to form a single body as shown in  FIG. 6 . 
       FIG. 6  is a diagram showing a typical personal computer  31  employing an LCD panel integrated therein to form a single body in accordance with another embodiment of the present invention. Thus, the personal computer  31  shown in  FIG. 6  includes a main unit  33  serving as an image supplying source and an LCD panel  32 , which has a refresh timing storage memory  34  for storing a recommended refresh timing. 
       FIG. 7  is a block diagram showing the configuration of a refresh-timing generation system of the typical personal computer  31  employing the LCD panel  32  integrated therein to form a single body in accordance with an embodiment of the present invention. In the configuration of the refresh-timing generation system shown in  FIG. 7 , a process of selecting a high refresh timing is carried out by supplying the recommended refresh timing stored in the refresh timing storage memory  34  to a high refresh timing select display unit  41 . The refresh-timing generation system is typically included in the LCD panel  32 . 
     Then, the high refresh timing select display unit  41  supplies a high refresh timing select display signal to a high refresh timing image data generation unit  42  for generating high refresh timing image data on the basis of the high refresh timing select display signal. 
     The high refresh timing image data generation unit  42  supplies the high refresh timing image data to a LCD driver  43 . Receiving the high refresh timing image data from the high refresh timing image data generation unit  42 , the LCD driver  43  supplies a signal for driving high refresh timing image data to the LCD panel  32 , which then displays the high refresh timing image data. 
     In a process of selecting a normal refresh timing, on the other hand, a normal refresh timing stored in the refresh timing storage memory  34  is supplied to a normal refresh timing image data generation unit  44 . 
     Then, the normal refresh timing image data generation unit  44  supplies a normal refresh timing select display signal to a normal refresh timing image data generation unit  45  for generating normal refresh timing image data on the basis of the normal refresh timing select display signal. 
     The normal refresh timing image data generation unit  45  supplies the normal refresh timing image data to the LCD driver  43 . Receiving the normal refresh timing image data from the normal refresh timing image data generation unit  45 , the LCD driver  43  supplies a signal for driving normal refresh timing image data to the LCD panel  32 , which then displays the high refresh timing image data. 
       FIG. 10  is a diagram showing a menu screen  51  appearing on the LCD panel  32  as a screen for selecting a high refresh timing. As shown in  FIG. 10 , the menu screen  51  displays a refresh timing select message  52  as a query. The menu screen  51  also displays icons of a high refresh  53  and a normal refresh  54 , which are each provided as a selectable response to the query. Typically, one of the icons representing the high refresh  53  and the normal refresh  54  is selected by operating a mouse. If the icon of the high refresh  53  is selected, the process of selecting the high refresh timing as described above is carried out. If the icon of the normal refresh  54  is selected, on the other hand, the process of selecting the normal refresh timing as described above is carried out. 
       FIGS. 8 and 9  show a flowchart representing processing carried out mainly by a CPU employed in the refresh timing generation system in order to allow the LCD panel  32  and the main unit  33  to display the recommended high refresh timing image data. It is to be noted that this CPU is shown in none of the figures. As shown in  FIGS. 8 and 9 , the flowchart of the processing begins with a step S 21  at which the CPU employed in the refresh timing generation system produces a result of determination as to whether or not the power supply of the personal computer  31  has been turned on. 
     If the determination result produced at the step S 21  indicates that the power supply of the personal computer  31  has been turned on, the flow of the processing goes on to a step S 22  at which the CPU employed in the refresh timing generation system produces a result of determination as to whether or not the main unit  33  employed in the personal computer  31  has recognized the LCD panel  32 . If the determination result produced at the step S 21  indicates that the power supply of the personal computer  31  has not been turned on or if the determination result produced at the step S 22  indicates that the main unit  33  employed in the personal computer  31  has not recognized the LCD panel  32 , the processing is ended. 
     If the determination result produced at the step S 22  indicates that the main unit  33  employed in the personal computer  31  has recognized the LCD panel  32 , on the other hand, the flow of the processing goes on to a step S 23  at which the personal computer  31  displays the menu screen  51  on the LCD panel  32 . 
     Then, at the next step S 24 , the CPU employed in the refresh timing generation system produces a result of determination as to whether or not the user has selected the high refresh timing through the menu screen  51 . 
     If the determination result produced at the step S 24  indicates that the user has selected the high refresh timing, the flow of the processing goes on to a step S 25  at which the personal computer  31  reads out information including the recommended high refresh timing from the refresh timing storage memory  34  employed in the LCD panel  32 . 
     Then, at the next step S 26 , the personal computer  31  outputs requested image data with the recommended high refresh timing to the LCD panel  32 . 
     If the determination result produced at the step S 24  indicates that the user has selected the normal refresh timing, on the other hand, the flow of the processing goes on to a step S 27  at which the personal computer  31  reads out information including the normal refresh timing from the refresh timing storage memory  34  employed in the LCD panel  32 . 
     Then, at the next step S 28 , the personal computer  31  outputs image data with the normal refresh timing to the LCD panel  32 . 
     After the process carried out at the step S 26  or S 28  is completed, the flow of the processing goes on to a step S 29  at which the CPU employed in the refresh timing generation system produces a result of determination as to whether or not image data has been supplied to the LCD panel  32 . If the determination result produced at the step S 29  indicates that image data has been supplied to the LCD panel  32 , the flow of the processing goes on to a step S 30  at which the CPU employed in the refresh timing generation system carries out a process to identify a refresh timing selected through the menu screen. 
     Then, at the next step S 31 , the CPU employed in the refresh timing generation system produces a result of determination as to whether or not the refresh timing selected through the menu screen is the recommended high refresh timing. If the determination result produced at the step S 31  indicates that the refresh timing selected through the menu screen is the recommended high refresh timing, the flow of the processing goes on to a step S 32  at which the CPU employed in the refresh timing generation system outputs high refresh timing image data generated by the high refresh timing image data generation unit  42  to the LCD driver  43 . 
     Then, at the next step S 33 , the LCD driver  43  outputs a signal for driving high refresh timing image data to the LCD panel  32 , which then displays the high refresh timing image data at the next step S 34 . 
     If the determination result produced at the step S 31  indicates that the refresh timing selected through the menu screen is the normal high refresh timing, on the other hand, the flow of the processing goes on to a step S 35  at which the CPU employed in the refresh timing generation system outputs normal refresh timing image data generated by the normal refresh timing image data generation unit  45  to the LCD driver  43 . 
     Then, at the next step S 36 , the LCD driver  43  outputs a signal for driving normal refresh timing image data to the LCD panel  32 , which then displays the normal refresh timing image data at the next step S 37 . 
     In addition, the liquid crystal display units according to the embodiments described above may employ an overdrive circuit for reducing the rise time of the LCD panel. On top of that, the liquid crystal display units according to the embodiments described above may be provided with a function for lowering the degree of blurring typical to a moving picture. An example of the function is a blinking backlight function for erasing a backlight of the LCD panel in the course of a refresh operation. With such an overdrive circuit and such a function, the effects of the present invention can be further improved. 
     The scope of the present invention is by no means limited to the embodiments described above. That is to say, it is needless to say that a variety of configurations can be provided as configurations not deviating from the domain of essentials of the present invention.