JP4557739B2 - Video conversion device and video display device - Google Patents

Description

  The present invention relates to a video conversion device and a video display device. More specifically, the present invention relates to a video signal having an aspect ratio of 4: 3 (hereinafter referred to as 4: 3 video signal) on a display panel having a resolution of an aspect ratio of 16: 9. The present invention relates to a video conversion device for displaying a video and a video display device including the device.

  In order to display a video source, a video display device using a matrix type display panel such as a liquid crystal panel or a plasma panel is known. For such a video display device, a display panel according to the display standard of a personal computer is usually used. Examples of such a display panel include a 4: 3 type VGA (640 dots × 480 dots) display panel having an aspect ratio of 4: 3 pixels, and a 4: 3 type XGA (1024 dots × 768 dots) display panel.

  On the other hand, in the format of the video source, 525i (such as NTSC) including 525 scanning lines and 480 effective scanning lines, and 525p including 525 scanning lines and 480 progressive scanning lines are effective. 1125i, 1125p (1080p), 750p (720p), etc., which are composed of 1125 video signal scanning lines and 1080 effective scanning lines as HDTV (High Definition TeleVision). It is prescribed. As described above, the number of scanning lines of the video source is different from the number of rows of pixels of the matrix display panel.

  Therefore, in order to display the video source on the matrix type display panel, it is necessary to perform vertical scaling. The vertical scaling here is a process of creating a new horizontal scanning signal in order to convert the number of video scanning lines into the number of vertical pixels of the panel. In addition, in order to display the video source on the matrix type display panel, horizontal scaling is performed in combination with vertical scaling.

  However, display panels having an aspect ratio of 4: 3 such as the above-described VGA and XGA display panels can display an image signal having an effective pixel aspect ratio of 4: 3 without distortion. However, a video signal having an effective pixel count aspect ratio of 16: 9 (hereinafter referred to as a 16: 9 video signal) is displayed with the video aspect ratio unchanged or distorted.

  On the other hand, as a 16: 9 type display panel suitable for 16: 9 video signals (referred to as a high-definition panel), a 16: 9 type W-XGA display having horizontal resolution × vertical resolution of 1,366 × 768 is provided. Panels are also on the market. In addition, among high-definition panels, a full-spec high-definition panel with horizontal resolution x vertical resolution of 1,920 x 1,080 is also available so that the high-definition signal format (1080i) of digital broadcasting can be expressed as it is. I'm starting.

  FIG. 7 is a diagram for explaining a conventional method for displaying a video signal having an aspect ratio of 4: 3 on a 16: 9 type display panel. Conventionally, on a 16: 9 type display panel, as shown in FIG. 7A, the 4: 3 video signal 71 is scaled and displayed as a video 72 having the same aspect ratio, and further to the left and right of the video 72. There is a display method for adding black bands 72a and 72b. In addition, as illustrated in FIG. 7B, the 4: 3 video signal 73 is scaled so that it becomes a 16: 9 video 74 (the aspect ratio of the central portion is maintained, and the larger the closer to the both ends in the horizontal direction, the larger the size becomes. A display method of displaying the image with a variable magnification), as illustrated in FIG. 7C, black bands 75a and 75b are converted from letterbox type 4: 3 video signal 75 having black bands 75a and 75b at the upper and lower ends. A display method in which the removed portion is scaled as it is with an aspect ratio (16: 9) and displayed as a video 76, and, as illustrated in FIG. 7D, originally compressed from a 16: 9 video signal to 4: 3. For example, there is a display method suitable for returning the displayed video signal 77 to the 16: 9 video 78 for display.

  The conventional method of displaying the 4: 3 video illustrated in FIGS. 7A to 7D on the 16: 9 screen is in each of the screen modes called normal mode, wide mode, cinema mode, full mode, and the like. It corresponds. Video display in each screen mode on the display panel can be selected by a user using a remote controller or the like.

Note that a wide display system such as a 16: 9 type has been proposed that controls vertical zoom and pan (see, for example, Patent Document 1).
Japanese Patent Publication No. 5-507597

  As described above, when a 4: 3 video signal is displayed on a 16: 9 type display panel, in the normal mode, there are black bands on the left and right sides without an image, and the black bands are too conspicuous and cause a sense of incongruity. : 3 images are displayed in a small size and the display panel is not fully utilized. In the wide mode, the aspect ratio (vertical / horizontal ratio) near the center remains almost the same as the original video signal, but the magnification changes as it goes to the end, and the end aspect ratio becomes extremely long, which makes it strange. There is. In the cinema mode, the aspect ratio is correct as it is the original video signal, but in order to adjust the enlargement ratio in the horizontal direction, it is necessary to cut off the top and bottom significantly. Therefore, in the cinema mode, the upper and lower video information is lost, and the input video that allows the video information to be viewed as it is is limited. In the full mode, unless the video signal is originally compressed from the 16: 9 video signal to 4: 3, the video is clearly horizontally long, which causes a sense of incongruity.

  In this way, when a 4: 3 video signal is displayed on a 16: 9 type display panel, a display that cannot fully utilize the 16: 9 type display panel, a display that feels uncomfortable, a very limited input video signal In other words, it is necessary to display such that the disappearance of the upper and lower video information cannot be ignored.

  The present invention has been made in view of the above circumstances, and in the case where a video signal having an aspect ratio of 4: 3 is displayed on a 16: 9 type display panel, A video conversion device that converts a 4: 3 video signal so that it is displayed on the screen of the display panel as large as possible without losing necessary upper and lower video information and giving the user a sense of incongruity while maintaining the same ratio. An object of the present invention is to provide a video display device including the video conversion device.

  The present invention is constituted by the following technical means in order to solve the above-described problems.

  A first technical means is a video conversion device that converts an input video signal when the video signal is displayed on a display panel having an aspect ratio of 16: 9, and the video signal has an aspect ratio of 4: 3. Input means, a scaling means for scaling the inputted 4: 3 video signal with a magnification X in the horizontal direction and a magnification Y in the vertical direction, and a video signal scaled by the scaling means. Output means for outputting to the display panel side, and the ratio X / Y of the magnification X and the magnification Y has a constant value larger than 1 and smaller than 1.33.

  According to a second technical means, in the first technical means, the input means has signal cutout means for cutting out the input 4: 3 video signal in a predetermined cutout range, and the vertical cutout of the predetermined cutout range. The direction cutout range has a predetermined ratio between the number of scanning lines excluded on the upper side and the number of scanning lines excluded on the lower side, and the scaling means is the signal cutting means. This is characterized by scaling the cut-out video signal.

  According to a third technical means, in the first or second technical means, the ratio X / Y has a constant value greater than 1 and 1.1 or less.

  According to a fourth technical means, in the first or second technical means, the ratio X / Y has a constant value larger than 1.05 and not larger than 1.1.

  A fifth technical means is any one of the first to fourth technical means, wherein the input means includes means for inputting a 16: 9 video signal up-converted based on a video signal having an aspect ratio of 4: 3. And when the input means receives a 16: 9 video signal, the scaling means scales the 16: 9 video signal based on a ratio X / Y having another constant value. The constant value is a value set so as to be the same ratio as the output pixel ratio as a result of scaling based on the constant value when a video signal is input by the input means. is there.

  A sixth technical means is a video display device comprising the video conversion device according to any one of the first to fifth technical means and a display panel, wherein the video conversion device is used for the input video signal. The present invention is characterized by comprising means for presenting on the display panel a display mode for scaling and displaying on the display panel so that the user can select the display mode.

  According to the present invention, when a 4: 3 video signal is displayed on a 16: 9 type display panel, the vertical and horizontal ratios of the 4: 3 video signal are substantially the same and the necessary upper and lower video information is lost. It is possible to convert a 4: 3 video signal so that it is displayed as large as possible on the screen of the display panel without causing the user to feel uncomfortable.

  A video conversion apparatus according to the present invention is an apparatus for converting an input video signal when the video signal is displayed on a display panel having an aspect ratio of 16: 9. The input means, scaling means, And output means. This video conversion apparatus is incorporated in, for example, a television receiver, various recorders, various tuner devices, a personal computer (PC), and the like. The display panel applies not only to liquid crystal panels for digital video sources, but also to other matrix type display devices such as plasma panels, etc., and also applicable to analog video signals. Is possible.

  The input means is a means for inputting a video signal having an aspect ratio of 4: 3 (for example, a 525i signal or a 525p signal), and various means such as a tuner for receiving a digital broadcast or an analog broadcast, or a portable recording medium such as a DVD. A means for reading out a video signal in a format, a means including an input terminal for inputting a video signal from the outside in a device incorporating a video conversion circuit, a means combining them, and the like correspond thereto.

  The scaling means is a means for scaling the 4: 3 video signal input by the input means with a magnification X in the horizontal direction and a magnification Y in the vertical direction, and holds, for example, a vertical scale and a horizontal scaler and video signals. It consists of a frame memory, a line memory, etc. The output means is means for outputting the video signal scaled by the scaling means to the display panel side, and corresponds to an output line and an output terminal to the display panel. It goes without saying that a circuit or the like for executing some processing may be provided between the output means and the display panel.

  In the video conversion device according to the present invention, as a main feature, the ratio X / Y of the magnification X and the magnification Y in the scaling unit has a constant value larger than 1 and smaller than 1.33. That is, in this scaling means, when a video signal having an aspect ratio of 4: 3 is displayed on a 16: 9 type display panel, the aspect ratio 4: 3 of the input video signal and the aspect ratio 16 of the screen of the display panel are displayed. : Converts to an image having an aspect ratio intermediate to 9. Here, X / Y = 1.33 is a zoom ratio in the full mode illustrated in FIG.

  As a result, the 4: 3 video signal and the aspect ratio do not change much, and the display panel screen is as large as possible without losing the necessary upper and lower video information and making the user feel uncomfortable as in the cinema mode. As a result, a 4: 3 video signal can be converted. For example, in order to make the left and right black bands smaller, it is possible to make full use of the area of the display panel compared to the normal mode by enlarging it slightly in the horizontal direction. It can be made narrower (reducing the black belt part), and it does not give the user a sense of incongruity due to the feeling of being horizontally long like the full mode or the change of the scaling factor like the wide mode. . Furthermore, the necessary upper and lower video information is not lost as in the cinema mode. That is, in this embodiment, the input 4: 3 video signal is not displayed at a distorted ratio to the full screen of the 16: 9 type display panel, but the ratio of 4: 3 is not changed so much. The display without any is realized.

  Furthermore, as another form, it is preferable that the input means is provided with the following signal cutout means. The signal cutout means is a means for cutting out the input 4: 3 video signal in a predetermined cutout range, and can be mounted by controlling input / output of the video signal to the frame memory or line memory, for example. In the vertical cutout range of the predetermined cutout range, the ratio between the number of scanning lines excluded on the upper side and the number of scanning lines excluded on the lower side is set to a predetermined ratio that the upper side is smaller than the lower side. The scaling unit performs a scaling process on the video signal cut out by the signal cutting out unit.

  The reason why the upper and lower cut-out ratios are set as described above is that, in terms of statistics and experience, it is often the case that the position of a telop or the like is slightly up in a video such as a television broadcast. By making the cutout position in the vertical direction slightly above the center, a situation in which necessary video information such as a telop is lost can be substantially avoided. Further, by cutting out such a signal, even when the same left and right black band widths are assumed, the zoom ratio X / Y can be set smaller, so that it is possible to display an image that does not make the user feel more uncomfortable. That is, in this embodiment, the 4: 3 video signal is not displayed at a distorted ratio to the full screen of the 16: 9 type display panel, but the 4: 3 ratio is not changed so much. : The area near the more important center in the three images can be displayed in a large size, and further, the image is cut out in the upper and lower cutout range so that necessary information is not lost when viewed from the user. Even in the case of the zoom ratio X / Y = 1, by shifting the center in the vertical direction by this cutting, the black band width when displaying 4: 3 signals compared to the conventional mode can be reduced and the screen can be effectively used. Use and other effects can be obtained.

  Hereinafter, the video conversion apparatus according to the present invention will be described only with respect to a preferred embodiment accompanied by the clipping process as described above, but the present invention does not necessarily require such a clipping process, Any configuration may be used as long as appropriate setting of X / Y and a scaling process based thereon are performed.

  FIG. 1 is a diagram for explaining an example of a video conversion process in a video conversion apparatus according to an embodiment of the present invention. In the figure, 11 is a video signal input by input means, and 12 is a signal from the video signal 11. The cutout range to be cut out by the cutting means, 13 is a screen displayed on the display panel, 14a is the left end black band portion displayed on the screen 13, 14b is the right end black band portion displayed on the screen 13, and 14c is the screen. 13 is a video portion displayed on the screen.

  First, the 4: 3 video signal 11 is input to the frame memory by the input means. The example shown in FIG. 1 is a case where the 4: 3 video signal 11 is a 480p signal. The 480p signal is a signal having 480 effective scanning lines among 525 scanning lines. For example, in the case of FIG. 1, 720 pixels are sampled in the horizontal direction per scanning line. In this case, one pixel is slightly long in the vertical direction. In the case of an interlace signal (480i signal), IP conversion processing such as generating a frame from an odd field and an even field using a frame memory may be performed in advance or simultaneously.

  The input 4: 3 video signal 11 is cut out in the cutout range 12 by the signal cutout means. Usually, in screen modes including not only the screen mode according to the present invention (hereinafter referred to as smart zoom mode) but also other screen modes (normal, wide, cinema, full), the image tends to occur at the upper and lower ends and the left and right ends of the image. In order not to display image disturbance or the like, at least 95% of the effective scanning lines (480 lines in this example: the same applies hereinafter) and at least 95% of the horizontal resolution (720 pixels) are set as the cutout range. . Note that this minimum cutout range (overscan area in the excluded portion) can vary depending on the manufacturer setting.

  On the other hand, in the smart zoom mode, the horizontal cutout range may be about 95%, but the effect of the present invention can be further enhanced by reducing the vertical cutout range. Further, in order not to exclude telops such as time display “9:10”, copyright display “BS2”, earthquake information, stock price information, etc., and to make the vertical cutout range smaller, it is excluded on the upper side as described above. The ratio of the number of scanning lines to be performed (23 lines) and the number of scanning lines to be excluded on the lower side (30 lines) is a predetermined ratio (23: 30≈1: 1.30) in which the upper side is smaller than the lower side. The cutout range 12 may be determined statistically or empirically with respect to 4: 3 video signals of a number of transmission sources. In this example, more preferable values are 684 pixels with a horizontal cutout range of 95%, 18 pixels with a 2.5% cutout at the left and right edges, 427 pixels with a vertical cutout range of 89%, and an upper cutout portion. 5%, and the lower exclusion part is 6%.

  The scaling unit performs enlargement scaling with the ratio X / Y on the video signal thus cut out. In this example, the most preferable constant value X / Y = 1.07 is used. With this constant value, the video signal in the cutout range 12 (video composed of 684 pixels × 427 pixels) is enlarged and scaled to the video portion 14 c (1640 × 1080) displayed on the screen 13. Here, it can be seen that X / Y = (1640/684) / (1080/427) × (724/640) ≈1.07. In this example, the x (720/640) portion corrects one pixel before zooming because it has a slightly longer shape in the vertical direction. Then, the video signals of the left end black belt portion 14a and the right end black belt portion 14b are added to the left and right ends of the video portion 14c, and the video of the screen 13 can be displayed on the display panel.

  The ratio X / Y may be determined statistically or empirically to such an extent that a change in aspect ratio between the 4: 3 video signal 11 and the video 14c displayed on the screen 13 does not give the user a sense of incongruity. Preferably, a constant value greater than 1 and 1.1 or less may be taken. However, in order to obtain the effect of the present invention, it is more preferable that the ratio X / Y is a constant value larger than 1.05 and not larger than 1.1. More preferably, as mentioned in this example, the ratio X / Y may be around 1.07.

  FIG. 2 is a diagram for explaining the flow of the video conversion process of FIG. 1, in which 21 is a video signal input process to the frame memory, 22 is a line buffer cut-out process, 23 is a vertical scaling process, 24 Indicates horizontal scaling processing, and 25 indicates video signal output processing to the line memory.

  The video conversion process in the example described with reference to FIG. 1 is performed by the following processing procedure, for example. First, the 4: 3 video signal 11 is input to the frame memory 21 in the video input process. After the video input process, a horizontal cutout process 22 for cutting out 684 pixels from 720 pixels in the horizontal direction is performed using a line buffer. Next, in the vertical scaling process 23, after the 480 scanning lines are cut out to 427 scanning lines by the above-described vertical cutting process, the vertical scaling process is performed by the vertical interpolation process.

  In the horizontal scaling process 24, a horizontal interpolation process is performed to interpolate from the video signal for 684 pixels in the horizontal direction to 1640 pixels, and the video signal is sequentially output to the line memory in the video signal output process 25 for each scanning line. And output to the display panel side.

  FIG. 3 is a diagram showing an example of the configuration of the video processing circuit for executing the video conversion processing described in FIGS. 1 and 2, in which 30 is a video processing circuit made up of ICs, and 31 and 41 are lines. Memory controller, 32 and 42 are line memories, 33 and 37 are DMA (Direct Memory Access), 34 is an internal bus, 35 is an external memory controller, 36 is a frame buffer, 38 is a line buffer controller, 39 is a line buffer, 40 is A scaling circuit 43 is a sub processor.

  The video processing circuit 30 illustrated in FIG. 3 shows only a circuit configuration in which a necessary minimum part is extracted, but an input switching process for switching input of various video signals and an AD conversion process for converting an analog signal into a digital signal , IP conversion processing for converting i signal to p signal, image quality enhancement correction processing such as enhancement of video edge by digital filter, OSD (On Screen Display) control, OSD composition processing for superimposing OSD on screen , And means for executing other processes such as a gamma correction process for adjusting the video tone by changing the gamma characteristic of the video according to the gamma table, and a controller for controlling the gate driver and source driver of the display panel May also be provided. The IP conversion process may have a circuit configuration that is performed simultaneously with scaling in the present invention.

  Hereinafter, the operation of the video processing circuit 30 will be schematically described with reference to the video conversion process of FIG. 1 as a specific example.

  The line memory controller 31 extracts valid video data from the input video signal based on a synchronization signal or the like, and writes the valid data to the line memory 32 in synchronization with the video input clock. The line memory 32 is a synchronous memory having a FIFO structure or a double buffer structure, and can be accessed in synchronization with two clocks. Of the two clocks, writing synchronized with one clock and reading synchronized with the other clock are possible.

  The line memory controller 31 reads the video data in synchronism with the internal clock of the video processing circuit 30 and sends the video data to the DMA 33 when the amount of valid video data accumulated in the line memory 32 is accumulated.

  The DMA 33 issues a request to the external memory controller 35 when the video data is accumulated by the determined amount. Thereafter, in accordance with the arbitration of the external memory controller 35, the video data is transferred to a predetermined address of the frame buffer 36 which is an external memory via the internal bus 34. The internal bus 34 is connected to all circuits that use the external memory 36 in the video processing circuit 30. In FIG. 3, except for the DMAs 33 and 37 and the external memory controller 35 related to the present invention are omitted.

  The external memory controller 35 receives requests from various circuits connected to the internal bus 34 and performs arbitration, and then performs data transfer and control between the internal circuit and the external memory 36. The frame buffer 36 stores the video data transferred from the DMA 33. The video data stores the entire range of video input (720 × 480 in FIG. 1).

  The DMA 37 issues a request to the external memory controller 35 when it is necessary to read a new line of video for video output. Thereafter, in accordance with the arbitration of the external memory controller 35, the video data is read from a predetermined address of the frame buffer 36 via the internal bus 34 and transferred to the line buffer controller 38. During this transfer, the left and right unnecessary portions on the horizontal line of the video before scaling are not transferred. Referring to FIG. 1, only the central 684 pixels excluding the left and right 18 pixels among the 720 pixels (pixels) in the horizontal direction are transferred.

  The line buffer controller 38 writes the video data sent from the DMA 37 at a predetermined position in the line buffer 39. The line buffer 39 stores video data lines necessary for the scaling circuit 40 to perform vertical scaling. The number of lines to be stored is at least the same as the number of taps of the vertical scaling filter. The line buffer controller 38 sends video data from the line buffer 39 to the scaling circuit 40 in parallel or in time division with the transfer from the DMA 37. Since the scaling circuit 40 first performs vertical scaling, the same number of vertical pixels as the number of taps of the filter are paired and sent to the scaling circuit 40 sequentially.

  The scaling circuit 40 first performs vertical scaling. As a result, a plurality of pixels in the vertical direction are subjected to a filter operation, so that video data corresponding to one pixel in the vertical direction before scaling in the horizontal direction is calculated. The scaling circuit 40 then performs horizontal scaling. When the video data as a result of the vertical scaling is collected by the number of taps of the horizontal filter, the product sum operation of the horizontal filter is sequentially performed to obtain video data of one pixel after scaling. This horizontal scaling expands the 684 pixels of the original video to 1640 pixels as described in FIG.

  The resulting video data calculated by the scaling circuit 40 is sequentially sent to the line memory controller 41, and the line memory controller 41 writes the data in a predetermined position in the line memory 42. The line memory 42 is a memory having a double buffer configuration, and can be accessed in synchronization with two clocks, and can be written in synchronization with one clock and read in synchronization with the other clock. Further, it is assumed that one memory has a capacity capable of storing video data for at least horizontal pixels of the display device.

  The line memory controller 41 has a function of writing data of a portion of the output video where the video data is not displayed (in FIG. 1, the left and right black belt portions of the scaled video). Corresponding data is written to the entire memory. Thereafter, the line memory controller 41 writes the data sent from the scaling circuit 40 to the memory at an address corresponding to the position where the data is finally displayed. Referring to FIG. 1, the scaled video data is written from a position spaced by an address corresponding to 140 pixels from the beginning of the memory. This completes one line of the final output video with black bands on the left and right sides of the video.

  Since the line memory 42 has a double buffer configuration, the line memory controller 41 writes video data previously created from the other memory in parallel with writing new video data to one memory (at that time, writing is performed). The output video data corresponding to one line of the video data) is read out in accordance with an output synchronization signal or the like and output as a video output.

  The DMA 37, the line buffer controller 38, the line buffer 39, the scaling circuit 40, the line memory controller 41, and the line memory 42 take one operation period from an arbitrary horizontal synchronizing signal to the next horizontal synchronizing signal as one operating period. In addition, the operation is performed so as to create one line of video data to be output. Here, when the 427 lines in the vertical direction are expanded to 1080 lines as shown in FIG. 1, the DMA 37 may or may not transfer a new line based on one output operation period.

  The sub-processor 43 decides whether or not to transfer this new line in the DMA 37, or considers unused lines seen at the upper and lower parts of the enlarged original video, and the video data in the frame buffer 36 necessary for the DMA 37 transfer. Transfer source addresses, and other necessary register settings for the DMA 37, the line buffer controller 38, the scaling circuit 40, and the line memory controller 41, etc. Take control.

  FIG. 4 is a diagram for explaining a 16: 9 video signal up-converted based on a video signal having an aspect ratio of 4: 3. FIG. 5 is a diagram for explaining an example of a video conversion process in a video conversion apparatus according to another embodiment of the present invention, and a 16: 9 video signal as shown in FIG. 4 has been described with reference to FIGS. It is a figure for demonstrating the process converted by a video converter and displayed on a display panel.

  4 and 5, 50 indicates a 4: 3 video signal, and 51 indicates a 16: 9 video signal obtained by up-converting the video signal 50. The video up-converted on the broadcast station side does not display the video disturbance that tends to occur at the left and right ends, and the remaining cut-out range (51c) of approximately 97% in the horizontal direction is used as the video, and the remaining 3% (51d) Is assumed to be added to the video portion added during up-conversion. That is, 51a, 51b and 51d in FIG. 4 are video portions added on the broadcast station side (hereinafter referred to as attached video portions), and 51c is the original 4: 3 video portion in the 16: 9 video signal 50. . However, since it is assumed that the image is cut out at approximately 97% in the horizontal direction, the image range is considered as 1397 × 1080, in which the image is not distorted at the aspect ratio of 1: 1 and the aspect ratio is not 4: 3. In FIG. 5, 52 is a clipping range that is clipped from the 16: 9 video signal 50 by the signal clipping means, 53 is a screen displayed on the display panel, 54a, 54b and 54d are attached video portions displayed on the screen 53, 54c. Is a video portion displayed on the screen 53.

  The input means in the embodiment described with reference to FIGS. 4 and 5 is a 16: 9 video signal 51 (for example, 1125i signal, up-converted based on a standard video signal 50 having an aspect ratio of 4: 3 as illustrated in FIG. 1125p signal, 750p signal). Here, the input of the 4: 3 video signal and the input of the 16: 9 video signal 51 in each of the above-described embodiments is determined and switched according to the video signal.

  When the 16: 9 video signal 51 is input by the input unit, the scaling unit according to the present embodiment displays the video 51c indicated by the up-converting 4: 3 video signal in the 16: 9 video signal. Scale based on the ratio X / Y with values. Here, the other constant value is the same ratio as the output pixel ratio (1640: 1080 in the example of FIG. 1) as a result of scaling based on the constant value when a 4: 3 video signal is input by the input means. It is a value set to be The ratio X / Y values are stored in, for example, two types of memory (in this example, values 1.07 and 1.04), and the values are switched by discriminating the input signal. This idea can be applied to the cutout range.

  First, the 16: 9 video signal 51 is input to the frame memory by the input means. The example shown in FIG. 5 is for the case where the 16: 9 video signal 51 is a 1080i signal. The 1080i signal is a signal having 1080 effective scanning lines among 1125 scanning lines, and is a signal that enables sampling of 1920 pixels in the horizontal direction per scanning line. When displaying at 1080p, it is necessary to perform IP conversion processing in advance or simultaneously, such as generating a frame from an odd field and an even field using a frame memory.

  Since the 16: 9 video signal 51 does not need to be processed at both ends so as not to display image disturbance as shown in FIG. 1, it is cut out in the range indicated by the dotted line 52 together with the attached video portion, and is the same as FIG. Enlargement is performed so that a scaled display result (1640 × 1080) is obtained. Therefore, compared with FIG. 1, although the same scaled display result is obtained, the enlargement ratio is as small as 1.04: 1.00, resulting in a video with less distortion. In addition, since the attached video portion is cut out, if there is character information in the attached video portion, all the information is not lost, and even for regular 16: 9 video that is not up-converted, most telops are cut out. There is an advantage that it is possible to view with the smart zoom without changing the screen mode.

  In the smart zoom mode in this embodiment, the effect of the present invention can be further enhanced by reducing the vertical cutout range. Further, as described above, the number of scanning lines excluded on the upper side (59 lines) and the number of scanning lines excluded on the lower side (60 lines) as described above in order not to exclude the telop and to further reduce the vertical cutout range. Is a predetermined ratio (59: 60≈1: 1.02) where the upper side is smaller than the lower side. The cutout range 52 may be determined statistically or empirically for any number of 16: 9 video signals 51 of the transmission source. In this example, more preferable values include 961 with a vertical cutout range of 89%, an upper exclusion portion of 5%, and a lower exclusion portion of 6%.

  The scaling unit performs enlargement scaling with the ratio X / Y on the video signal thus cut out. In this example, other constant values X / Y = 1.04 are set so that the same scaling result (1640 × 1080) as the result of adopting the most preferable constant value X / Y = 1.07 illustrated in FIG. Used. With this value, the video signal in the cutout range 52 (video consisting of 1397 pixels × 961 pixels) is enlarged and scaled to the video portion 54 c (1640 × 1080) displayed on the screen 53. Here, it can be seen that X / Y = (1640/1397) / (1080/961) ≈1.04. Then, the attached video portions indicated by 54a, 54b, and 54d are cut out from the 16: 9 video signal 51 so as to be equal to the horizontal enlargement ratio from the cutout range 51c to the video portion 54c. In this example, (1397/1640) × 140≈119, and the horizontal cutout range is 1397 + 119 × 2 = 1635. In addition, the ratio X / Y in this case is selected as appropriate in consideration of the effect of the values calculated for the 16: 9 video signal according to the preferable range together with the values of the various preferable ranges described in FIG. Use it.

  FIG. 6 is a schematic diagram showing an example of a video display device according to the present invention, in which 60 is a television receiver as an example of the video display device, and 61 is a remote user communicating with the television receiver 60. 61a and 61c are select keys on the remote controller 61, 61b is a decision key on the remote controller 61, 61d is a function key on the remote controller 61, 62 is a screen size switching menu, 63 is a screen mode option, and 63a is “ “Smart zoom” option.

  The video display device according to the present invention includes at least the video conversion device and the display panel of each of the above-described embodiments, and is used in the television receiver 60 illustrated in FIG. 6 or a PC with a 16: 9 type monitor. Implementation is possible. The video display device according to the present invention further includes a display unit that presents on the display panel a display mode in which the input video signal is scaled by the video conversion device and displayed on the display panel. And Hereinafter, a video display device according to the present invention will be briefly described by taking a television receiver 60 as an example.

  First, it is assumed that the 4: 3 video signal illustrated in FIG. 1 is displayed in the normal mode on the screen of the television receiver 60. The user feels uncomfortable in the normal mode, and displays the screen size switching menu 62 on the screen by pressing the function key 61d of the remote controller 61 or the like. Then, the “smart zoom” option is selected by the up / down selection keys 61a and 61c from the screen mode options 63 on which the list of modes of normal, wide, cinema, full, and smart zoom is displayed. Determine the screen mode. By this determination, the video conversion (scaling) process described above is performed, and a video as shown on the screen 13 in FIG. 1 is displayed on the screen of the television receiver 60.

  It should be noted that other OSD displays including the display of the screen size switching menu 62 may be mixed with a video signal in order to superimpose fonts or graphics generated by built-in font data or bitmap data on the screen, for example. Here, the display panel will be briefly described by taking a liquid crystal panel as an example. The liquid crystal panel is controlled by the video controller converting the video data into a signal for driving the liquid crystal panel and outputting the signal to the gate driver and the source driver. The gate driver determines which line is written by controlling the gate signal of the active matrix of the liquid crystal panel. The source driver controls the source signal of the active matrix of the liquid crystal panel.

It is a figure for demonstrating an example of the video conversion process in the video converter which concerns on one Embodiment of this invention. It is a figure for demonstrating the flow of the video conversion process of FIG. FIG. 3 is a diagram illustrating a configuration example of a video processing circuit for executing the video conversion processing described with reference to FIGS. 1 and 2. It is a figure for demonstrating the 16: 9 video signal up-converted based on the video signal of aspect ratio 4: 3. It is a figure for demonstrating an example of the video conversion process in the video converter which concerns on other embodiment of this invention. It is the schematic which shows an example of the video display apparatus which concerns on this invention. It is a figure for demonstrating the conventional method at the time of displaying the video signal which has the effective pixel number of aspect ratio 4: 3 in a 16: 9 type | mold display panel.

Explanation of symbols

11 ... Input video signal (4: 3 video signal), 12, 52 ... Cut out range, 13, 53 ... Display screen, 14a, 51a, 54a ... Left end black belt portion, 14b, 51b, 54b ... Right end black belt portion, 14c , 51c, 54c ... display video portion, 21 ... video signal input processing, 22 ... clipping processing, 23 ... vertical scaling processing, 24 ... horizontal scaling processing, 25 ... video signal output processing, 30 ... video processing circuit, 31, 41 ... Line memory controller, 32, 42 ... Line memory, 33,37 ... DMA, 34 ... Internal bus, 35 ... External memory controller, 36 ... Frame buffer, 38 ... Line buffer controller, 39 ... Line buffer, 40 ... Scaling circuit, 43 ... sub processor, 50 ... 16: 9 video signal original signal, 51 ... 16: 9 video signal, 60 ... telephone Television receiver, 61 ... remote controller, 61a, 61c ... selection key, 61b ... enter key, 61d ... function keys, 62 ... Screen size selection menu, 63 ... screen mode option, 63a ... "Smart Zoom" option.

Claims (6)

  A video conversion device that converts an input video signal when the video signal is displayed on a display panel having a resolution of an aspect ratio of 16: 9. The video signal has an aspect ratio of 4: 3 (hereinafter referred to as 4: 3 video). Input means), a scaling means for scaling the input 4: 3 video signal with a magnification X in the horizontal direction and a magnification Y in the vertical direction, and an image scaled by the scaling means Output means for outputting a signal to the display panel, and the ratio X / Y between the magnification X and the magnification Y has a constant value larger than 1 and smaller than 1.33.   The input unit includes a signal cutout unit that cuts out the input 4: 3 video signal in a predetermined cutout range, and the vertical cutout range of the predetermined cutout range is the number of scanning lines excluded on the upper side. The ratio of the number of scanning lines excluded on the lower side is set to a predetermined ratio on the upper side which is smaller than the lower side, and the scaling unit scales the video signal cut out by the signal cutting unit. Item 2. The video conversion device according to Item 1.   The video conversion apparatus according to claim 1, wherein the ratio X / Y has a constant value greater than 1 and 1.1 or less.   The video conversion apparatus according to claim 1, wherein the ratio X / Y has a constant value greater than 1.05 and less than or equal to 1.1.   The input means has means for inputting a video signal with an aspect ratio of 16: 9 (hereinafter referred to as a 16: 9 video signal) up-converted based on a video signal with an aspect ratio of 4: 3, and the scaling means When a 16: 9 video signal is input by the input means, the 16: 9 video signal is scaled based on a ratio X / Y having another constant value, and the other constant value is 5. A value set to have the same ratio as an output pixel ratio as a result of scaling based on the constant value when a 4: 3 video signal is input by the means. The video conversion apparatus of any one of Claims.   6. A video display device comprising the video conversion device according to claim 1 and a display panel, wherein an input video signal is scaled by the video conversion device and the display is performed. A video display device comprising means for presenting a display mode to be displayed on the panel on the display panel so as to be selectable by a user.

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