JP5211513B2 - Digital image display device - Google Patents

Description

  The present invention relates to a digital image display device, and more particularly to a digital image display device including a display screen unit capable of displaying a video signal.

  Conventionally, a digital image display device including a display screen unit capable of displaying a video signal is known (see, for example, Patent Documents 1 and 2).

  Patent Document 1 discloses a video signal output device capable of displaying a video signal on a video display device (connection monitor). In the video signal output device described in Patent Document 1, when outputting a video signal to a video display device (connection monitor), the video format information included in the video signal and the video display device can be displayed using a communication function. The video format information is compared, and based on the comparison result, a video format candidate that can be displayed by the video display device is displayed on the video display device. A user can select a video format that is actually displayed on the video display device from among the displayable video format candidates.

  Patent Document 2 discloses a video display device (video signal output device) capable of displaying a video signal on a receiver (connection monitor). In the video display device (video signal output device) described in Patent Document 2, the control unit sequentially converts the video signal into a plurality of different video formats, outputs the video signal to the receiver (connection monitor), and converts the video signal. The video format suitable for the receiver is set by inquiring of the user whether or not the video signal is displayed on the receiver by the video format. A plurality of video formats suitable for the receiver can be set.

JP 2005-167895 A JP 2005-117306 A

  However, in the video signal output device described in Patent Document 1, selection (determination) of a video format to be actually displayed on the video display device from a plurality of displayable video format candidates is left to the user's judgment. Therefore, there is a problem that the video format selected by the user is not necessarily selected as the optimum video format to be displayed on the video display device. Further, in the video signal output device of Patent Document 1, the video signal output device that is the output source of the video signal is based on the communication function between the video display device (connection monitor) and the video signal output device. When a video display device that cannot communicate with the video signal output device is connected, the video format with the video display device is determined. There is a problem that the suitability above cannot be judged.

  In addition, the video display device (video signal output device) described in Patent Document 2 discloses a configuration in which a plurality of video formats suitable for the receiver are set by a user's operation. There is no disclosure or suggestion on how to determine the video format to be displayed. Therefore, when applying a method in which the determination of the video format to be actually displayed out of the settings of the video format suitable for the receiver is applied to the user's judgment, the video format determined by the user is not necessarily optimally displayed on the receiver. There is a problem in that it may not be selected as a proper video format.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to display on a display screen unit regardless of the presence or absence of a communication function with a video signal output device. By providing a digital image display device that can determine a video signal by itself and that can reliably determine an optimal video format to be displayed on a display screen without any user operation. is there.

Means for Solving the Problems and Effects of the Invention

  A digital image display device according to a first aspect of the present invention is a digital image display device having a display screen portion capable of displaying a video signal, and a memory portion capable of storing a video format of a video signal that can be displayed on the display screen portion. If the video format of the input video signal cannot be displayed, the video format group that can be displayed on the display screen unit is selected and displayed on the display screen unit. And a video format is composed of at least information on screen resolution and refresh rate including information on the number of pixels in the horizontal direction and the number of pixels in the vertical direction, and the control unit can display the display screen unit. Horizontal direction of the screen resolution of the video format of the input video signal in the video format group Based on the information on the number of pixels and the number of pixels in the vertical direction, the video format having the screen resolution most similar to the screen resolution of the video format of the input video signal among the video format groups that can be displayed on the display screen unit. And selecting the video format having the refresh rate that is most similar to the refresh rate of the video format of the input video signal and controlling the selected video format to be displayed on the display screen unit. The difference between the number of pixels in the horizontal direction of the video format of the video signal and the number of pixels in the horizontal direction of the video format group that can be displayed on the display screen, the number of pixels in the vertical direction of the video format of the input video signal, and the display screen The sum of the difference from the number of pixels in the vertical direction of the video format group that can be displayed is the smallest and the input The display screen that most closely resembles the video format of the input video signal when the difference between the refresh rate of the video format of the received video signal and the refresh rate of the video format group that can be displayed on the display screen is minimized The unit is configured to determine that the video format can be displayed.

  In the digital image display device according to the first aspect, as described above, when display is not possible due to the video format of the input video signal, the video format most similar to the video format of the video signal is selected and displayed on the display screen section. By configuring to include a control unit to display, the control unit selects a video format most similar to the video format of the video signal based on the video signal from the video signal output device connected to the outside of the device body. Since the display screen can be displayed on the display screen, even if a video signal output device that does not have a communication function is connected, the video signal that can be displayed on the display screen is determined by itself. Can do. In addition, the memory unit that can store the video format of the video signal that can be displayed on the display screen unit, and the video format group that can be displayed on the display screen unit when the video format of the input video signal cannot be displayed. A plurality of video formats that can be displayed on the display screen stored in the memory unit by including a control unit that selects and displays the video format most similar to the video format of the signal on the display screen unit Unlike the case where the determination of the video format to be actually displayed is left to the user's judgment, the optimal video format to be displayed on the display screen unit by the control unit can be reliably determined without any user operation. it can.

  In the digital image display device according to the first aspect, the video format is composed of information on the screen resolution and the refresh rate including information on at least the number of pixels in the horizontal direction and the number of pixels in the vertical direction, and a control unit is provided. Of the video format groups that can be displayed on the display screen, the video format having the screen resolution most similar to the screen resolution of the video format of the input video signal and the refresh rate of the video format of the input video signal are the most similar By selecting a video format having a refresh rate to be displayed and controlling it to be displayed on the display screen unit, the control unit has information on screen resolution and refresh rate in the video format of the input video signal. Based on the best video format Since-option, it is possible to display the video signal by the video format that reflects most strongly the properties of the video format of the input video signal. In addition, the control unit controls the screen of the video format of the input video signal from the video format group that can be displayed on the display screen unit based on the information about the number of pixels in the horizontal direction and the number of pixels in the vertical direction of the screen resolution. Optimum based on the number of pixels in the horizontal direction and the number of pixels in the vertical direction of the screen resolution of the video format of the input video signal by selecting the video format with the screen resolution that is most similar to the resolution Therefore, it is possible to easily select a video format that reflects the aspect ratio (the aspect ratio of the screen) of the video format of the input video signal.

  In the digital image display device according to the first aspect, the control unit is configured to determine the number of horizontal pixels in the video format of the input video signal and the number of horizontal pixels in the video format group that can be displayed on the display screen unit. The sum of the difference and the difference between the number of pixels in the vertical direction of the video format of the input video signal and the number of pixels in the vertical direction of the video format group that can be displayed on the display screen is minimum, and the input The display screen that most closely resembles the video format of the input video signal when the difference between the refresh rate of the video format of the video signal and the refresh rate of the video format group that can be displayed on the display screen is minimized Is determined to be a displayable video format, so that the control unit selects the most similar video format. In addition to the aspect ratio (the aspect ratio of the screen) of the video format of the input video signal, the characteristics of the refresh rate (vertical synchronization frequency) of the video format of the input video signal are added to the judgment criteria. Therefore, the optimum video format that reflects the characteristics of the video format of the input video signal can be selected more reliably.

A digital image display device according to a second aspect of the present invention includes a display screen unit capable of displaying a video signal, a memory unit capable of storing a video format of the video signal which can be displayed on the display screen unit, and an input video signal If the first can not be displayed by the video format, the display of the screen portion is displayable video format group controlled to be displayed on the display screen unit selects the second video format which is most similar to the first picture format of the video signal and a section, the video format includes information about the screen resolution and refresh rate consisting information between the number of pixels at least the number of pixels in the horizontal direction and the vertical direction, the control unit includes a first image format and Film image format group the sum of the difference between the number of pixels in the horizontal direction, the difference between the vertical number of pixels of the first video format and movies image format groups with It is small, and the video format in which the difference between the refresh rate of the first video format and video format group is minimized, and is configured to determine a second video format.

In the digital image display device according to the second aspect, as described above, when the first video format of the input video signal cannot be displayed, the second video format most similar to the first video format of the video signal is selected. The control unit is configured to include the control unit that displays on the display screen unit, so that the control unit converts the video signal into the first video format based on the video signal from the video signal output device connected to the outside of the device main body. Since the most similar second video format can be selected and displayed on the display screen unit, even if a video signal output device not having a communication function is connected, it is displayed on the display screen unit. It is possible to make a judgment of possible video signals. In addition, a memory unit that can store a video format of a video signal that can be displayed on the display screen unit, and a video format group that can be displayed on the display screen unit when the first video format of the input video signal cannot be displayed. It is possible to display on the display screen part stored in the memory part by comprising a control part that selects and displays the second video format most similar to the first video format of the video signal on the display screen part. Unlike the case where the user decides which video format to actually display among the multiple video format candidates, the optimal video format to be displayed on the display screen by the control unit is ensured without user operation. Can be determined. In addition, since the optimum video format is selected based on the number of pixels in the horizontal direction and the number of pixels in the vertical direction among the screen resolutions of the first video format of the input video signal, the first video of the input video signal is selected. The second video format reflecting the format aspect ratio (the aspect ratio of the screen) can be easily selected. In addition, in the process of selecting the most similar second video format by the control unit, in addition to the aspect ratio (the aspect ratio of the screen) of the first video format of the input video signal described above, Since the characteristics of the refresh rate (vertical synchronization frequency) of one video format are also added to the determination criteria, the optimum second video format reflecting the characteristics of the first video format of the input video signal is selected more reliably. be able to.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a circuit configuration of a liquid crystal display according to an embodiment of the present invention. FIG. 2 is a table showing the contents of the video format of the analog video signal input to the liquid crystal display according to the embodiment shown in FIG. 3 and 4 are diagrams showing the configuration of the liquid crystal display according to the embodiment shown in FIG. First, with reference to FIGS. 1-4, the structure of the liquid crystal display 10 by one Embodiment of this invention is demonstrated. In the present embodiment, a case where the present invention is applied to a liquid crystal display which is an example of a digital image display device will be described.

  As shown in FIG. 1, the liquid crystal display 10 according to the embodiment of the present invention includes a control circuit unit 20 provided in the apparatus main body connected to a personal computer 40 via a signal cable 30, and an apparatus main body. By connecting the control circuit unit 20 and the display screen unit 50 internally, the analog video signal 60 output from the video output unit (video board) 41 of the personal computer 40 can be displayed on the display screen unit 50. It is configured. The analog video signal 60 is an example of the “video signal” in the present invention.

  The analog video signal 60 output from the video output unit (video board) 41 of the personal computer 40 is obtained by dividing analog data of one frame of video (one still image) for each scanning line in the horizontal direction of the image. One frame is continuously transmitted as the data (analog voltage value) at the horizontal synchronization frequency, and one frame of video is continuously updated and displayed (refreshed) at the vertical synchronization frequency to reproduce as a viewable image. It is configured to be possible. Further, as shown in FIG. 2, the analog video signal 60 from the personal computer 40 is configured to include a video format 61 including the number of screen pixels, a refresh rate (vertical synchronization frequency), and the like. Various types of the video format 61 are defined by VESA (Video Electronics Standards Association).

  Here, in this embodiment, as shown in FIG. 1, the control circuit unit 20 of the liquid crystal display 10 includes an analog-digital conversion unit 21, a control unit 22 including a CPU, a memory unit 23, and an OSD (on-screen display). ) Part 24. Therefore, the control unit 22 controls the analog-digital conversion unit 21 to convert the analog video signal 60 from the personal computer 40 into the digital video signal 70 and display it on the display screen unit 50. Yes.

  Further, in this embodiment, as shown in FIG. 3, the control unit 22 (see FIG. 1) can be displayed on the display screen unit 50 (see FIG. 1) in the memory unit 23 (see FIG. 1) of the liquid crystal display 10. A plurality of video format groups 62 are stored in advance. Therefore, the control unit 22 (see FIG. 1) displays the video format 61a of the analog video signal 60 input by the analog-digital conversion unit 21 (see FIG. 1) and the display stored in the memory unit 23 (see FIG. 1). If the possible video format group 62 (see FIG. 3) is different, it is most similar to the video format 61 a of the analog video signal 60 being input from among the plurality of video format groups 62 stored in the memory unit 23. It is configured to be able to perform control for selecting one video format. Then, as shown in FIG. 4, the control unit 22 (see FIG. 1) displays the content of the selected one video format in the form of a message screen 51 through the OSD unit 24 (see FIG. 1). 50 can be controlled to be displayed. In the following description, the content of the video format 61a of the analog video signal 60 is indicated as “800 pixels × 600 pixels, refresh rate 70 Hz”.

  In the present embodiment, the control unit 22 (see FIG. 1), the video format of the analog video signal 60 from the video format group 62 (see FIG. 3) stored in the memory unit 23 (see FIG. 1). When one video format most similar to 61a is selected, among the plurality of displayable video format groups 62, the screen resolution N1 (N1 = 800 pixels × 600 pixels) of the video format 61a of the analog video signal 60 is most similar. The video format group 62a (see FIG. 3) having the screen resolution N2 to be selected is selected as the first, and the refresh rate VF1 (VF1 = 75 Hz) of the video format 61a of the analog video signal 60 is selected from the video format group 62a. Video format having the refresh rate VF2 most similar to 62b is configured to be able to apply the method of selecting (see FIG. 3) as the second.

  Furthermore, in this embodiment, the control unit 22 (see FIG. 1) selects a video format group 62a (see FIG. 3) having a screen resolution N2 that is most similar to the screen resolution N1 of the video format 61a of the analog video signal 60. At this time, the video format is based on the information of the horizontal pixel number X1 (X1 = 800 pixels) and the vertical pixel number Y1 (Y1 = 600 pixels) of the screen resolution N1 of the video format 61a of the analog video signal 60. Of the group 62 (see FIG. 3), a method of selecting a video format 62 group a having a screen resolution most similar to the screen resolution N1 of the video format 61a of the analog video signal 60 is applied.

  In the present embodiment, the control unit 22 (see FIG. 1), the video format of the analog video signal 60 from the video format group 62 (see FIG. 3) stored in the memory unit 23 (see FIG. 1). In the process of selecting the video format 62b most similar to 61a (see FIG. 3), the number X1 of pixels in the horizontal direction of the video format 61a of the analog video signal 60 and the video format that can be displayed on the display screen unit 50 (see FIG. 1). The absolute value of the difference A (A = X1-X2) from the horizontal pixel count X2 of the group 62, the vertical pixel count Y1 of the video format 61a of the analog video signal 60, and the video that can be displayed on the display screen unit 50 The sum C (C = A + B) of the absolute value of the difference B (B = Y1−Y2) from the number Y2 of pixels in the vertical direction of the format group 62 is the minimum, and the input analog The absolute value of the difference D (D = VF1-VF2) between the refresh rate VF1 (VF1 = 75 Hz) of the video format 61a of the image signal 60 and the refresh rate VF2 of the video format group 62 that can be displayed on the display screen unit 50 is minimum. The video format is determined as the video format 62b (see FIG. 3) that can be displayed on the display screen unit 50 most similar to the video format 61a of the analog video signal 60.

  As shown in FIG. 1, the control circuit unit 20 includes a program storage memory unit 25 in which a control program for the control unit 22 to select the video format described above is stored in addition to the above-described components. Yes. In addition, as shown in FIG. 1, each component of the control circuit unit 20 is connected to each other by a bus (transmission path) 26, so that a control signal, control calculation data, and the like can be passed to each other. It is configured as follows.

  Further, as shown in FIG. 1, in a state where the personal computer 40 and the liquid crystal display 10 are connected, the user operates the video format setting unit 42 of the personal computer 40 to thereby display the display screen unit 50 of the liquid crystal display 10. It is possible to change the setting to the video format recommended by the control unit 22 while viewing the video (image) that can be displayed on the screen.

  5 and 6 are flowcharts illustrating a process of selecting a video format that can be displayed on the liquid crystal display according to the embodiment of the present invention illustrated in FIG. Next, the control operation of the control unit 22 in the process of selecting a video format that can be displayed on the liquid crystal display 10 according to the present embodiment will be described with reference to FIGS. 1 and 3 to 6.

  As shown in FIG. 1, in a state where the liquid crystal display 10 is connected to the personal computer 40, an analog video signal 60 having a predetermined video format is sent from the video output unit (video board) 41 of the personal computer 40 to the liquid crystal display 10. The control unit 22 executes the control flow shown in FIG.

  First, in step S1, as shown in FIG. 4, the control unit 22 sends an analog video signal 60 (see FIG. 1) from the personal computer 40 (see FIG. 1) via the analog-digital conversion unit 21 (see FIG. 1). And if the analog video signal 60 from the personal computer 40 is not detected, this determination is repeated until the analog video signal 60 from the personal computer 40 is detected. If it is determined in step S1 that the analog video signal 60 from the personal computer 40 has been detected, in step S2, the control unit 22 specifies (recognizes the video format of the analog video signal 60 that is currently input. ) In the present embodiment, it is assumed that the video format 61a specified in step S2 is “800 pixels × 600 pixels, refresh rate 70 Hz”.

  In step S3, the control unit 22 displays a video format that the control unit 22 can display on the display screen unit 50 with respect to the video format 61a (800 pixels × 600 pixels, refresh rate 70 Hz) of the analog video signal 60 that is currently input. It is determined whether or not. This is performed by the controller 22 sequentially inquiring recording data of the displayable video format group 62 (see FIG. 3) stored in advance in the memory unit 23. Further, when it is determined in step S3 that the video format of the currently input analog video signal 60 matches one of the video format groups 62 that can be displayed on the display screen unit 50 by the control unit 22. In step S4, the control unit 22 converts the currently input analog video signal 60 into a digital video signal 70 by the analog-to-digital conversion unit 21 (see FIG. 1), and then displays it on the display screen unit 50. Control is performed and this control flow ends.

  In step S3, the video format group 62a (800 pixels × 600 pixels, refresh rate 70 Hz) of the currently input analog video signal 60 can be displayed on the display screen unit 50 by the control unit 22 (FIG. 3). In step S5, the control unit 22 selects a video format that can be displayed on the display screen unit 50. I do. In this embodiment, the control unit 22 can display the video format 61a (800 pixels × 600 pixels, refresh rate 70 Hz) of the currently input analog video signal 60 on the display screen unit 50 based on the determination result of step S3. The processing operation (processing after step S5) of the control unit 22 when it does not exist in the video format group 62 will be described.

  Here, in the present embodiment, the control unit 22 performs control to select a video format that can be displayed on the display screen unit 50 based on a control flow as shown in FIG.

  Specifically, first, in step S51, the number of pixels X1 (X1 = 800 pixels) in the horizontal direction, the number of pixels Y1 in the vertical direction (Y1 = 600 pixels), and the video format of the currently input analog video signal 60, and The refresh rate VF1 (VF1 = 75 Hz) is recognized. In step S52, the number of pixels X1 and the number of pixels X2 in the horizontal direction of the displayable video format group 62 (see FIG. 3) stored in advance in the memory unit 23 (X2 = 640, 640, 640, 800, and 5 types of 800 pixels) are sequentially compared, and the absolute value of the difference A (A = X1−X2) between the number of pixels X1 and the number of pixels X2 in the horizontal direction is sequentially obtained. In the next step S53, the number of pixels Y1 and the number of pixels Y2 in the vertical direction of the displayable video format group 62 (see FIG. 3) stored in advance in the memory unit 23 (Y2 = 480, 480, 600, (5 types of 600 and 600 pixels) are sequentially compared, and the absolute value of the difference B (B = Y1-Y2) between the number of pixels Y1 and Y2 in the vertical direction is sequentially obtained. In step S54, the sum C (C = A + B) of the absolute value of the difference A and the absolute value of the difference B is obtained, and the video format group 62a when the sum C has the minimum value (see FIG. 3). To extract.

  At the time when Steps S51 to S54 are executed, the control unit 22 calculates the minimum value of the sum C of the absolute value of the difference A and the absolute value of the difference B to “zero” (C = 0). Have gained. Therefore, as shown in FIG. 3, the candidate video format group 62a is limited to two types of “800 pixels × 600 pixels, refresh rate 60 Hz” and “800 pixels × 600 pixels, refresh rate 75 Hz”.

  In the present embodiment, in the next step S55, the refresh rate VF1 (VF1 = 70 Hz) of the currently input analog video signal 60 and the displayable video format stored in the memory unit 23 in advance. The refresh rates VF2 (VF2 = 60 Hz and 75 Hz) of the group (two types described above) are sequentially compared, and the absolute value of the difference D (D = VF1-VF2) between the refresh rate VF1 and the refresh rate VF2 is sequentially obtained. In step S56, one video format when the absolute value of the difference D has the minimum value is selected. In this case, the control unit 22 obtains a calculation result that the minimum absolute value of the difference D is “5” (D = 70−75 = −5). Therefore, as shown in FIG. 3, the selected video format is a video format 62b of “800 pixels × 600 pixels, refresh rate 75 Hz”.

  As described above, in the present embodiment, first, in the process in which the control unit 22 (see FIG. 1) selects one video format 62b (see FIG. 3) from the plurality of video format groups 62 (see FIG. 3). First, the number of pixels of the video format 61a (the number of pixels X1 in the horizontal direction and the number of pixels Y1 in the vertical direction) of the analog video signal 60 and the number of pixels of the video format group 62 (the number of pixels X2 in the horizontal direction and the pixels in the vertical direction). 2), and secondly, in the order of comparing the refresh rate VF1 of the video format 61a of the analog video signal 60 and the refresh rate VF2 of the video format group 62, the video format 61a of the analog video signal 60 is compared. The most similar video format 62b is selected.

  In step S57, the control unit 22 (see FIG. 1) determines the selected video format 62b (800 pixels × 600 pixels, refresh rate 75 Hz) as a recommended video format. Then, the control unit 22 ends the present control flow shown in FIG. 6 and proceeds to step S6 of the control flow shown in FIG.

  In the present embodiment, in the next step S6, the control unit 22 inputs, for example, “a video format that cannot be displayed on this display” by the OSD unit 24 (see FIG. 1) as shown in FIG. Depending on the connection source of the display (PC or the like), control is performed to display a message screen 51 saying “screen size: 800 pixels wide × 600 pixels vertical, refresh rate: 75 Hz”.

  In step S7, the control unit 22 determines whether or not a predetermined time (about 20 seconds) has elapsed from the time when the message screen shown in FIG. 4 is displayed, and makes this determination until the predetermined time elapses. repeat. When it is determined that a predetermined time (about 20 seconds) has elapsed from the time when the message screen 51 shown in FIG. 4 is displayed, the control unit 22 ends the present control flow shown in FIG.

  The user looks at the message screen 51 (see FIG. 4) displayed for a predetermined time (about 20 seconds), thereby viewing the video format 61a (800 pixels × 600 pixels, refresh rate) of the currently input analog video signal 60. 70 Hz), it is recognized that the screen cannot be displayed. Therefore, by operating the video format setting unit 42 of the personal computer 40 again, the video format of the analog video signal 60 output to the liquid crystal display 10 is changed. The setting is reset to “screen size: horizontal 800 pixels × vertical 600 pixels, refresh rate: 75 Hz”.

  Then, when the analog video signal 60 whose video format has been changed to “800 pixels × 600 pixels, refresh rate 75 Hz” is again input to the control circuit unit 20 of the liquid crystal display 10 by the user, the control unit 22 A control flow similar to that described above is executed. In this case, through steps S1 to S3, the video format 61b of the currently input analog video signal 60 is “800 pixels × 600 pixels, refresh rate 75 Hz”, and a video format group that can be displayed on the display screen unit 50. 62 (see FIG. 3), it is determined that it matches one of the video formats 62b (see FIG. 3). Therefore, in step S4 (see FIG. 5), the analog video signal 60 currently input is converted into the analog-to-digital converter 21. After converting into the digital video signal 70 by (refer FIG. 1), the display screen part 50 is controlled to display. As a result, the user can view the video in the recommended video format.

  Further, even when the user connects the newly purchased liquid crystal display 10 from the existing display connected to the personal computer 40, the control unit 22 of the newly purchased liquid crystal display 10 is the same as described above. Execute the control flow. When the control unit 22 determines that the video format of the analog video signal 60 input to the newly connected liquid crystal display 10 for the first time through step S1 to step S3 cannot be displayed on the display screen unit 50. First, the user recognizes that the screen cannot be displayed in the current video format by viewing the message screen 51 (see FIG. 4) displayed for a predetermined time (about 20 seconds). Then, the user once again returns the connection from the newly connected liquid crystal display 10 to the display before the replacement, and while viewing the analog video signal 60 displayed on the previous display, the user again By operating the video format setting unit 42, the setting is changed to the video format designated by the control unit 22 of the newly purchased liquid crystal display 10. Then, by connecting again the newly-replaced liquid crystal display 10, the user can view the video in the video format after the setting change.

  In the present embodiment, as described above, when the video format 61a of the input analog video signal 60 cannot be displayed, one video format most similar to the video format 61a of the analog video signal 60 is selected and selected. By configuring the control unit 22 to display the contents of the video format 62b on the display screen unit 50 together with the message screen 51, the control unit 22 can output analog video from the personal computer 40 connected to the outside of the apparatus main body. Since the video format most similar to the video format 61a of the analog video signal 60 can be selected based on the signal 60 and displayed on the display screen unit 50, a video signal output device having no communication function is connected. Display even on the display screen 50 The decision of a video signal can be carried out himself.

  Further, in the present embodiment, the memory unit 23 capable of storing the video format group 62 of the analog video signal 60 that can be displayed on the display screen unit 50, and the video format 61a (800 pixels × 600) of the input analog video signal 60. When the display cannot be performed due to the pixel and the refresh rate of 70 Hz, the video format group 62 that can be displayed on the display screen unit 50 is selected and selected from the video formats 61a that are most similar to the video format 61a of the analog video signal 60. The content stored in the display unit 50 is displayed on the display screen unit 50 together with the message screen 51 (800 pixels × 600 pixels, refresh rate 75 Hz). Display on screen 50 Unlike the case where the determination of the video format to be actually displayed is left to the user's judgment among a plurality of possible video format candidates (video format group 62), the optimal video format to be displayed on the display screen unit 50 by the control unit 22 (Video format 62b) can be determined reliably.

  In the present embodiment, the control unit 22 sets the screen resolution N2 that is most similar to the screen resolution N1 of the video format 61a of the input analog video signal 60 in the video format group 62 that can be displayed by the display screen unit 50. By selecting the video format having the refresh rate VF2 most similar to the refresh rate VF1 of the video format 61a of the input analog video signal 60 and the video format 61a of the input analog video signal 60, the display screen unit 50 is configured to perform control. The control unit 22 selects one optimal video format from the video format 61a of the input analog video signal 60 based on the information of the screen resolution and the refresh rate. The best characteristics of the video format 61a It is possible to display a video signal on the display screen unit 50 by the image format that reflects strongly.

  Further, in the present embodiment, the control unit 22 controls the video format group 62 (FIG. 3) that can be displayed on the display screen unit 50 based on the information about the horizontal pixel count X1 and the vertical pixel count Y1. The video format group 62a (see FIG. 3) having the screen resolution N2 that is most similar to the screen resolution N1 of the video format 61a of the input analog video signal 60 is selected. Since the optimum video format is selected based on the horizontal pixel count X1 and the vertical pixel count Y1 in the screen resolution of the video format 61a of the analog video signal 60, the video format of the input analog video signal 60 is A video format reflecting the 61a aspect ratio (the aspect ratio of the screen) can be easily selected.

  In the present embodiment, the control unit 22 controls the horizontal pixel number X1 of the video format 61a of the input analog video signal 60 and the horizontal pixel number X2 of the video format group 62 that can be displayed on the display screen unit 50. And the difference between the absolute value of the difference A and the number Y1 of pixels in the vertical direction of the video format 61a of the input analog video signal 60 and the number of pixels Y2 in the vertical direction of the video format group 62 that the display screen unit 50 can display. The refresh rate of the video format group 62 that can be displayed by the refresh rate VF1 of the video format 61a of the input analog video signal 60 and the display screen unit 50 is the sum C (C = A + B) of the absolute value of B is minimum. The video format when the absolute value of the difference D (D = VF1-VF2) from the rate VF2 is minimized is the analog video signal input. In the process in which the control unit 22 selects the most similar video format, the display screen unit 50 most similar to the 60 video formats 61a is determined as the displayable video format. In addition to the aspect ratio (the aspect ratio of the screen) of the video format 61a of the video signal 60, the characteristics of the refresh rate (vertical synchronization frequency) of the video format 61a of the input analog video signal 60 are also added to the determination criteria. The video format (video format 62b) reflecting the characteristics of the video format 61a of the input analog video signal 60 can be selected more reliably.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, an example in which the present invention is applied to a liquid crystal display as an example of a digital image display device has been described. However, the present invention is not limited to this, and control capable of detecting the video format of an input video signal. If it is a digital image display apparatus provided with a unit, it can also be applied to a digital image display apparatus other than a liquid crystal display such as an organic EL display.

  In the above embodiment, the control unit 22 is most similar to the video format 61a of the analog video signal 60 from the video format group 62 (see FIG. 3) stored in the memory unit 23 (see FIG. 1). When selecting one video format, among the plurality of video format groups 62 (see FIG. 3), the video format group 62a having the screen resolution N2 most similar to the screen resolution N1 of the video format 61a of the analog video signal 60 is selected. A method of selecting the first video format 62b having the refresh rate VF2 most similar to the refresh rate VF1 of the video format 61a of the analog video signal 60 from the video format group 62a. However, the present invention is not limited to this example. First, the refresh rate of the video format 61a of the analog video signal 60 is compared with the refresh rate of the displayable video format group 62, and the second is the number of pixels of the video format 61a of the analog video signal 60. The video format most similar to the video format 61a of the analog video signal 60 may be selected according to the order of comparison with the number of pixels of the video format group 62 that can be displayed.

  Moreover, in the said embodiment, the control part 22 is based on the information of the screen resolution and refresh rate of the video format 61a of the input analog video signal 60 among the video format groups 62 which the display screen part 50 can display. Although an example in which control is performed to select a video format most similar to the video format 61a of the input analog video signal 60 has been shown, the present invention is not limited to this, and the video of the input analog video signal 60 is shown. Control may be performed to select a video format most similar to the video format of the input analog video signal 60 based on information other than the format screen resolution and refresh rate information.

  In the above embodiment, the control unit 22 is configured to notify the user of the selection result of the most similar video format through the message screen 51. However, the present invention is not limited thereto, and together with the message screen, You may comprise so that a user may be notified by an audio | voice. Further, the message screen may not be displayed, and the user may be notified only by voice.

1 is a block diagram illustrating a circuit configuration of a liquid crystal display according to an embodiment of the present invention. 2 is a table showing the contents of a video format of an analog video signal input to the liquid crystal display according to the embodiment shown in FIG. 1. 3 is a table showing the contents of a displayable video format stored in advance in the liquid crystal display according to the embodiment shown in FIG. 1. It is the figure which showed the structure of the liquid crystal display by one Embodiment shown in FIG. It is the figure which showed the flowchart in the control flow of the liquid crystal display by one Embodiment shown in FIG. It is the figure which showed the flowchart in the control flow of the liquid crystal display by one Embodiment shown in FIG.

Explanation of symbols

22 Control Unit 23 Memory Unit 50 Display Screen Unit 60 Analog Video Signal (Video Signal)
61, 61a Video format 62, 62a Video format group 62b Video format N1, N2 Screen resolution VF1, VF2 Refresh rate X1, X2 Horizontal pixel count Y1, Y2 Vertical pixel count

Claims (2)

In a digital image display device having a display screen capable of displaying a video signal,
A memory unit capable of storing a video format of the video signal that can be displayed on the display screen unit;
When display is not possible due to the video format of the input video signal, a video format that is most similar to the video format of the video signal is selected from the video format group that can be displayed on the display screen unit and displayed on the display screen unit. And a control unit for displaying,
The video format is composed of information on at least a screen resolution and a refresh rate including information on the number of pixels in the horizontal direction and the number of pixels in the vertical direction,
The control unit is information on the number of pixels in the horizontal direction and the number of pixels in the vertical direction of the screen resolution of the video format of the input video signal in the video format group that can be displayed by the display screen unit. Based on the video format group that can be displayed by the display screen unit, the video format having the screen resolution most similar to the screen resolution of the video format of the input video signal is selected and input. The video signal having the refresh rate most similar to the refresh rate of the video format of the video signal is selected and controlled to be displayed on the display screen unit.
The control unit includes a difference between the number of pixels in the horizontal direction of the video format of the input video signal and the number of pixels in the horizontal direction of the video format group that can be displayed on the display screen unit, and the input The sum of the difference between the number of pixels in the vertical direction of the video format of the video signal and the number of pixels in the vertical direction of the video format group that can be displayed on the display screen unit is the minimum, and the input video The video format when the difference between the refresh rate of the video format of the signal and the refresh rate of the video format group that can be displayed on the display screen is the smallest is the video format of the input video signal. A digital image display device configured to determine as the video format that can be displayed by the similar display screen unit A display screen that can display video signals;
A memory unit capable of storing a video format of the video signal that can be displayed on the display screen unit;
If that can not be displayed by the first video format of the input video signal, among the display screen unit of the video format group that can be displayed, and select the second video format which is most similar to the first image format of said video signal And a control unit for displaying on the display screen unit,
The video format includes information on screen resolution and refresh rate, which includes at least information on the number of pixels in the horizontal direction and the number of pixels in the vertical direction,
Wherein the control unit, the vertical pixel before SL and the difference in the number of pixels in the horizontal direction between the first image format before SL video format group, a pre-Symbol first video format before SL video format group The video format when the sum of the number difference and the difference in the refresh rate between the first video format and the video format group is minimized is determined as the second video format. A digital image display device configured as described above.

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