JP2020201410A - Video display device - Google Patents

Abstract

To provide a video display device with which it is possible to perform a frame interpolating operation or an overdrive image generating operation with few noise and flickers in the boundary portion of a plurality of display areas.SOLUTION: A signal source 301 delivers the display data of display areas 100a-115a to respective display modules 100-115. The respective display modules 100-115 include a data processing unit for extracting, for multiple frames in order of time series, the display data of a computation area that includes display areas 100a-115a allocated to the display modules 100-115 and display module-side areas, out of the display areas allocated to the display modules adjacent to said display module, executing frame interpolation computation using the display data of the multiple frames, and extracting the display data of interpolated frames that correspond to the display areas 100a-115a allocated to the display modules 100-115 from the display data of interpolated frames obtained by frame interpolation computation.SELECTED DRAWING: Figure 6

Description

The present invention relates to a video display device in which a plurality of display modules such as a liquid crystal display are arranged to form one display screen.

In a video display device in which a plurality of display modules are arranged to form one display screen, there is a problem that the image quality is deteriorated due to the response speed of the liquid crystal panel or the operation blur peculiar to the hold type display device. It has become. As a countermeasure for this problem, a drawing frame frequency multiplication technique and an overdrive technique accompanied by frame interpolation are known (see, for example, Patent Document 1).

International Publication No. 2011/0275993

When the drawing frame frequency multiplication technique with frame interpolation described in Patent Document 1 is adopted in a video display device including one display module, it is expected that the frame interpolation operation is performed.

On the other hand, when the above-mentioned multiplication technology is adopted for an image display device that forms one display screen by arranging a plurality of display modules, and divided images are supplied for enlarged display and frame interpolation operation is performed, the image is divided. It may be difficult to perform accurate frame interpolation operation from the displayed image. Therefore, there is a problem that noise or flicker is generated at the boundary portion of each display area.

Similarly to this, even when an overdrive image generation operation for improving the response speed of a liquid crystal panel or the like is performed using images of a plurality of frames, there is a problem that noise or flicker is generated at the boundary portion of each display area. There is.

Therefore, an object of the present invention is to provide a video display device capable of performing a frame interpolation operation or an overdrive image generation operation with less noise and flicker at the boundary portion of a plurality of display areas.

The video display device according to the present invention is a video display device connected to a signal source of a video signal and arranging a plurality of display modules to form one display screen, wherein the signal source is the display screen. The display data of all the display areas of the above is distributed to each of the display modules, and each of the display modules is the display module side of the display area allocated to the display module and the display area allocated to the display module adjacent thereto. A plurality of frames of the display data of the calculation area including the area are extracted in chronological order, a frame interpolation calculation is performed using the display data of the plurality of frames, and the display data of the interpolation frame obtained by the frame interpolation calculation is used. It is provided with a data processing unit that extracts display data of an interpolation frame corresponding to the display area assigned to the display module.

According to the present invention, it is possible to perform a frame interpolation operation with less noise and flicker at the boundary portion of a plurality of display areas.

It is a block diagram of the image display device and the external device which concerns on Embodiment 1. FIG. FIG. 5 is a block diagram of a display module included in the video display device according to the first embodiment. It is a schematic diagram which shows the image of the image enlarged display on the image display device which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the arithmetic area which performs frame interpolation formed in a plurality of display areas. It is a figure which shows the table of the coordinate example of a calculation area. It is a schematic diagram which shows the frame interpolation operation in the image display device which concerns on Embodiment 1. FIG. It is a flowchart which shows the operation of a microcontroller. It is a block diagram of the image display device and the external device which concerns on Embodiment 2. FIG. It is a schematic diagram which shows the frame interpolation operation in the single screen video display device which concerns on a related technique. It is a schematic diagram which shows the frame interpolation operation in the multi-screen video display device which concerns on a related technique.

<Embodiment 1>
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a video display device 1000 and an external device according to the first embodiment.

As shown in FIG. 1, the image display device 1000 is composed of 16 display modules 100 to 115, and 16 display modules 100 to 115 are arranged to form one display screen. Each display module 100 to 115 includes an LCD panel 5 (see FIG. 2), an input terminal 1 (see FIG. 2), and an output terminal 2 (see FIG. 2), which are single display devices, and is beaded by a video signal cable 10. It is connected by a connection (daisy chain connection).

The video signal cable 10 includes a side channel (AUX channel). The display module 100 operates as a master device in communication and control functions via side channels, and the display modules 101 to 115 operate as slave devices. Individual identification numbers (IDs) are assigned to the display modules 100 to 115.

The video display device 1000 is connected to a signal source 301 of a video signal as an external device. The signal source 301 is a computer or the like connected to the display module 100, and includes an output terminal. The signal source 301 and the display module 100 are connected by a video signal cable 10, so that side channels are connected, and all display modules 100 to 115 connected by a string of beads are controlled.

Next, the circuit configuration of the display module 100 will be described with reference to FIG. FIG. 2 is a block diagram of a display module 100 included in the video display device 1000. The display modules 101 to 115 have the same circuit configuration as the display module 100, and thus the description thereof will be omitted.

As shown in FIG. 2, the display module 100 includes an input terminal 1, an output terminal 2, a scaler IC 3, a microcontroller 4, an LCD (Liquid Crystal Display) panel 5, a non-volatile memory 6, an infrared remote control light receiving unit 7, and communication control. It has a terminal 8.

A video signal is input to the scaler IC 3 from the input terminal 1. Further, the input terminal 1 is a terminal for a bidirectional control signal, and the control signal is input to the scaler IC 3 from the input terminal 1. Alternatively, a control signal is output from the scaler IC 3 to the input terminal 1.

A video signal is output from the scaler IC 3 to the output terminal 2. Further, the output terminal 2 is a terminal for a bidirectional control signal, and the control signal is input to the scaler IC from the output terminal 2. Alternatively, a control signal is output from the scaler IC 3 to the output terminal 2.

The scaler IC3 basically has a function of processing the input video signal and driving the LCD panel 5 to display the video. However, in the first embodiment, in addition to this, the frame interpolation calculation and the LCD panel 5 are performed. It has a function to adjust the overdrive calculation and backlight brightness to increase the drive speed of the LCD.

The LCD panel 5 displays an image based on the image signal, and further displays an OSD operation screen. The scaler IC 3 and the microcontroller 4 are connected by a communication bus. The communication bus is connected to the side channels of the input terminal 1 and the output terminal 2 by the internal bridge circuit 3a of the scaler IC3.

The microcontroller 4 controls the scaler IC3. The details of the control of the scaler IC3 by the microcontroller 4 will be described later. An infrared remote controller light receiving unit 7 is connected to the microcontroller 4 to receive an OSD (On Screen Display) operation command from an external infrared remote controller (not shown). Further, a non-volatile memory 6 and a communication control terminal 8 are connected to the microcontroller 4. The non-volatile memory 6 is a memory for storing each parameter according to the result of the OSD operation.

Next, the frame interpolation operation will be described. First, the frame interpolation operation in the case of a single screen will be described with reference to FIG. FIG. 9 is a schematic diagram showing a frame interpolation operation in a single-screen video display device according to a related technique.

As shown in FIG. 9, the original image before the frame interpolation operation is an image displayed in the order of frames F1, F2, F3, and F4. Then, the interpolation frame F12 is interpolated between the frames F1 and F2, the interpolation frame F23 is interpolated between the frames F2 and F3, and the interpolation frame F34 is interpolated between the frames F3 and F4. In reality, in a single-screen video display device, the display area is not divided into 16, but a broken line is shown to make it easier to understand the position of the image of the arrow.

Next, the frame interpolation operation and its problems in the case of a multi-screen will be described. First, an image of an image enlarged display on the video display device 1000 will be described. FIG. 3 is a schematic view showing an image of an enlarged image display on the image display device 1000.

In FIG. 3, an enlarged display image by the multi-screen video display device 1000 is shown on the right side, and an original image by the single-screen video display device is shown on the left side for comparison. As shown in FIG. 3, the display screen of the video display device 1000 corresponds to the display area 1000a before division. The display areas 100a to 115a are assigned to the display modules 100 to 115, respectively, and the display screens of the display modules 100 to 115 correspond to the divided display areas 100a to 115a, respectively.

Next, the frame interpolation operation for the image displayed in the display area 105a of the multi-screen video display device according to the related technique will be described with reference to FIG. FIG. 10 is a schematic diagram showing a frame interpolation operation in a multi-screen video display device according to a related technique.

As shown in FIG. 10, in the interpolated frames F12, F23, and F34 displayed in the display area 105a, the discontinuity of the frame F1 and the frame F2, the discontinuity of the frame F2 and the frame F3, and the discontinuity of the frame F3 and the frame F4. It is difficult to interpolate the image because the following problems occur due to the discontinuity.

In the interpolation frame F12, the image of the frame F1 is used as it is, and in the interpolation frame F23, the image of the frame F2 is used as it is. Further, in the interpolation frame F34, the image of the frame F3 is used as it is. In this case, the display is irregular in time in the display area 105a, and is recognized as noise by the viewer at the boundary portion of the display area 105a. The portion surrounded by the circles A, B, and C in FIG. 10 is a portion recognized as noise.

Next, the frame interpolation operation of the first embodiment for solving such a problem will be described. FIG. 4 is a schematic view showing a calculation area 700 for performing frame interpolation formed in a plurality of display areas 100a, 101a, 102a, 104a, 105a, 106a, 108a, 109a, 110a. FIG. 5 is a diagram showing a table of coordinate examples of the calculation area 700. FIG. 6 is a schematic diagram showing a frame interpolation operation in the video display device 1000.

As shown in FIG. 4, the upper left coordinate of the display area 1000a is the origin (0,0), and the lower right coordinate is (3389,2159). That is, the display area 1000a includes an area of 3840 × 2160 dots as a whole. Hereinafter, the calculation area 700 including the display area 105a and its peripheral area will be described.

The calculation area 700 is an area that is a target of frame interpolation calculation and overdrive calculation for the display area 105a, and is a display area 105a and display areas 100a, 101a, 102a, 104a, 106a, 108a, 108a, This is an area including the area on the display area 105a side (display module 105 side) of the 109a and 110a.

The display areas 100a, 101a, 102a, 104a, 105a, 106a, 108a, 109a, 110a are 3 × 3 areas centered on the display area 105a. As shown in FIGS. 4 and 5, the vertical length of the calculation area 700 is twice the vertical length of the display area 105a, and the horizontal length of the calculation area 700 is the horizontal length of the display area 105a. It is twice the length in the direction. As a result, the area of the calculation area 700 is four times the area of the display area 105a, and is one-fourth of the area of the display area 1000a.

As shown in FIG. 6, the calculation area 700 is used when performing the frame interpolation calculation of the display area 105a. That is, even when the image of the arrow is not in the display area 105a in the front and rear frames and is in the area on the display area 105a side of the adjacent display areas 100a, 101a, 102a, 104a, 106a, 108a, 109a, 110a. The display data of the calculation area 700 is used. Hereinafter, "the area on the display area 105a side of the display areas 100a, 101a, 102a, 104a, 106a, 108a, 109a, 110a adjacent thereto" is also simply referred to as "peripheral area".

When the interpolation frame F12 is obtained, the frame F1 and the frame F2 including the display data of the calculation area 700 are used, and when the interpolation frame F23 is obtained, the frames F2 and the frame F3 including the display data of the calculation area 700 are used. .. Further, when obtaining the interpolation frame F34, the frame F3 and the frame F4 including the display data of the calculation area 700 are used. The display data of the interpolation frames F12, F23, F34 corresponding to the display area 105a is extracted from the display data of the interpolation frames F12, F23, and F34 obtained by the frame interpolation calculation, and is output to the LCD panel 5.

In the above, the case of the frame interpolation calculation has been described, but the calculation area 700 is also used in the case of the overdrive image calculation.

As shown in FIG. 4, the frame interpolation calculation or the overdrive image calculation is performed not only in the calculation area 700 including the display area 105a and its peripheral area, but also in the display areas 100a to 104a, 106a to 115a other than the display area 105a and their surroundings. It is also performed for the calculation area including the area. For example, in the case of the calculation area including the display area 100a and its peripheral area, the calculation area is an area including the display area 100a and the area on the display area 100a side of the display areas 101a, 104a, 105a adjacent thereto. ..

Here, the calculation area for each of the display modules 100 to 115 is set by the microcontroller 4 for the scaler IC 3 when the infrared remote controller light receiving unit 7 receives the OSD operation command from the infrared remote controller. The infrared remote control light receiving unit 7 corresponds to a reception unit that accepts the setting of the size of the calculation area.

In the video display device 1000 according to the first embodiment, the frame interpolation calculation or the overdrive image calculation is performed in the area including each display area 100a to 115a and its peripheral area, so that the vicinity of the boundary of each display area 100a to 115a is performed. Noise is reduced. As shown in FIG. 6, noise is reduced in the portion surrounded by the circles A, B, and C.

Next, the operation of the microcontroller 4 included in the display module 100 will be described with reference to FIG. 7. FIG. 7 is a flowchart showing the operation of the microcontroller 4. The microcontroller 4 included in the display modules 101 to 115 has the same operation as that of the display module 100, and thus the description thereof will be omitted.

As shown in FIG. 7, the microcontroller 4 after startup initializes the memory, IO port, and peripheral ICs such as the scaler IC3 in the microcontroller 4 (step S1). Next, the microcontroller 4 performs communication processing such as communication control with other display modules 101 to 115 or a signal source 301 which is an external control device, and command processing (step S2). Next, the microcontroller 4 processes the OSD and the remote control operation (step S3).

Next, the microcontroller 4 causes the scaler IC3 to perform a calculation area setting process related to the frame interpolation calculation or the overdrive image calculation (step S4). Next, the microcontroller 4 causes the scaler IC3 to perform a frame rate setting switching process, which is a frame rate conversion frequency setting process (step S5). Next, the microcontroller 4 causes the scaler IC3 to perform an image enlargement display setting process, which is a setting process at the time of scaling (cutting out or enlarging) display (step S6). Here, steps S2 to S6 form a main loop and are repeatedly executed.

Next, the operation of the microcontroller 4 included in the display modules 100 to 115 in the main loop of steps S2 to S6 will be described in detail.

As shown in FIG. 7, in step S2, the microcontroller 4 of the display module 100 operating as the master device calculates with respect to the display modules 101 to 115 operating as all the other slave devices according to the preset information. The area and display area setting information is distributed via the side channel of the video signal cable 10. At the same time, the display modules 101 to 115 operating as the slave device receive the setting information of the calculation area and the display area distributed from the display module 100 operating as the master device.

In step S3, the master and slave operations for the display modules 100 to 115 are set by operating the OSD and the remote controller. In addition, in step S3, the setting information of the calculation area and the display area of the display modules 100 to 115 is updated by operating the OSD and the remote controller.

Here, when expanding the calculation area, it means that a large amount of movement is dealt with, but at the same time, it means that the change speed of the image is large. When the image change speed is large, display blurring occurs due to the response speed of the LCD panel 5 which is a display device. Therefore, even if the calculation area is unnecessarily expanded, noise may not be noticeable due to display blurring by the LCD panel 5. Therefore, the calculation area is set in consideration of the displayed video content and the response speed of the LCD panel 5.

In step S4, the microcontrollers 4 of the display modules 100 to 115 frame interpolate into the scaler IC3 of the display modules 100 to 115 to which they belong, based on the setting information of the calculation area set in step S2 or step S3. Set the calculation area for calculation or overdrive image calculation.

In step S5, the microcontroller 4 of each display module 100 to 115 converts a frame to the scaler IC3 of each display module 100 to 115 to which the microcontroller IC 3 belongs, depending on whether or not the size of the range of the calculation area exceeds a certain threshold value. To switch the speed of. For example, the input signal to the scaler IC3 is multiplied by 4 until the size of the calculation area 700 is 4 times that of the display area 105a, and when it exceeds 4 times, it is multiplied by 2.

In step S6, the microcontroller 4 of each display module 100 to 115 displays a frame interpolation image of the calculation area set in step S2 or step S3 on the scaler IC3 of each display module 100 to 115 to which the microcontroller 4 belongs. The image enlargement display setting process for displaying on 100a to 115a is performed.

In the image enlargement display setting process, the microcontroller 4 of each display module 100 to 115 has the scaler IC3 of each display module 100 to 115 to which it belongs, and the display areas 100a to 115a allocated to the display modules 100 to 115. Of the display areas allocated to the display modules adjacent to the display module, the display data of the calculation area including the display module side area is extracted in a plurality of frames (before and after frames) in chronological order. Next, the microcontrollers 4 of the display modules 100 to 115 perform frame interpolation calculation on the scaler IC3 of the display modules 100 to 115 to which the display modules 100 to 115 belong, using the display data of a plurality of frames (before and after frames), and frame interpolation operations are performed. The display data of the interpolation frame corresponding to the display area allocated to the display modules 100 to 115 is extracted from the display data of the interpolation frame obtained by the interpolation calculation.

Next, the microcontrollers 4 of each display module 100 to 115 correspond to the scaler IC3 of each display module 100 to 115 to which the microcontroller IC3 belongs, and the display areas 100a to 115a assigned to the display modules 100 to 115 to which the scaler IC3 belongs. Using the display data of the interpolation frame, a frame interpolation operation of multiplying the frame rate of the display data of the display areas 100a to 115a allocated to the display modules 100 to 115 and drawing is performed. Here, the scaler IC3 provided in each display module 100 to 115 corresponds to the data processing unit. In addition, instead of the frame interpolation operation, the overdrive image generation operation is also performed at the time of the image enlargement display setting process.

As described above, in the image display device 1000 according to the first embodiment, the signal source 301 distributes the display data of all the display areas 100a to 115a of the display screen to the display modules 100 to 115, and the display modules 100. ~ 115 is a time-series display data of a calculation area including the display areas 100a to 115a allocated to the display modules 100 to 115 and the display module side area among the display areas allocated to the display modules adjacent thereto. Multiple frames are extracted in order, frame interpolation calculation is performed using the display data of multiple frames, and the display data of the interpolation frames obtained by the frame interpolation calculation corresponds to the display areas 100a to 115a allocated to the display modules 100 to 115. The scaler IC3 is provided as a data processing unit for extracting the display data of the interpolated frame.

Alternatively, the signal source 301 distributes the display data of all the display areas of the display screen to the display modules 100 to 115, and each display module 100 to 115 includes the display area allocated to the display modules 100 to 115 and this. Of the display areas allocated to the display modules adjacent to, the display data of the calculation area including the display module side area is extracted in multiple frames in chronological order, and overdrive image calculation is performed using the display data of multiple frames. The scaler IC3 is provided as a data processing unit that extracts display data corresponding to the display area allocated to the display module from the display data obtained by the overdrive image calculation.

Therefore, since the frame interpolation calculation or the overdrive image calculation in consideration of the display areas 100a to 115a and the peripheral area thereof can be performed, the frame interpolation operation or the overdrive image with less noise and flicker at the boundary portion of the plurality of display areas can be performed. The generation operation can be performed.

Further, in order to perform a frame interpolation calculation or an overdrive image calculation in consideration of the display areas 100a to 115a assigned to each display module 100 to 115 and their peripheral areas without performing the calculation for the display area 1000a of the entire display screen. The processing time is reduced as compared with the case where the calculation is performed for the display area 1000a of the entire display screen, and the scale of the memory and the calculation circuit required for the calculation can be reduced to a smaller scale, and the cost can be reduced. ..

The scaler IC3 multiplies the frame rate of the display data of the display area allocated to the display module by using the display data of the interpolated frame corresponding to the display areas 100a to 115a allocated to the display modules 100 to 115 included in the scaler IC3. Performs frame interpolation operation to draw. Therefore, the quality of the image quality is improved by improving the motion blur.

Each display module 100 to 115 further includes an infrared remote control light receiving unit 7 as a reception unit that receives the setting of the size of the calculation area, and the scaler IC3 corresponds to the size of the calculation area received by the infrared remote control light receiving unit 7. To switch the operating frequency of the frame interpolation operation.

Therefore, the noise reduction effect or the priority of the calculation resource to be used can be changed according to the response speed of the LCD panel 5 and the change speed of the display content.

Further, even when performing overdrive image calculation, each display module 100 to 115 further includes an infrared remote control light receiving unit 7 that accepts a setting of the size of the calculation area, so that the response speed of the LCD panel 5 and the change in the display content are changed. Depending on the speed, the noise reduction effect or the priority of the computing resources used can be changed.

<Embodiment 2>
Next, the video display device 1000 according to the second embodiment will be described. FIG. 8 is a configuration diagram of the image display device 1000 and the external device according to the second embodiment. In the second embodiment, the same components as those described in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 8, in the second embodiment, the configuration of the external device connected to the video display device 1000 is different from that of the first embodiment. The external devices connected to the video display device 1000 are a signal source 301, a signal distributor 401, a control device 501, and a switching hub 601.

The signal distributor 401 is a video signal distributor having a function of distributing video signals, and a signal source 301 is connected to the video input terminal via a video signal cable 311. In the video display device 1000, the video output terminals of the signal distributor 401 are connected to the video input terminals of the display modules 100 to 115 via the video signal cable group 321.

The LAN communication control output terminal of the control device 501 is connected to one of the input / output terminals of the switching hub 601 via a cable 511, and the other input / output terminals communicate with each display module 100 to 115 via the cable group 521. It is connected to the control terminal 8.

The operation of the microcontroller 4 included in the display module 100 is the same as the operation described in the first embodiment. The display modules 100 to 115 operate as slave devices, and the communication control in step S2 is performed between the control device 501 and each display module 100 to 115 via the cable 511, the switching hub 601 and the cable group 521.

As described above, since the video display device 1000 according to the second embodiment is configured as described above, the same effect as that of the first embodiment can be obtained.

In the present invention, each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted within the scope of the invention.

3 scaler IC, 7 infrared remote control receiver, 100-115 display module, 301 signal source, 1000 video display device.

Claims (5)

A video display device connected to a signal source of a video signal and arranging a plurality of display modules to form one display screen.
The signal source distributes display data of all display areas of the display screen to each display module.
Each display module extracts a plurality of frames of display data of a calculation area including a display area allocated to the display module and a display area allocated to a display module adjacent to the display module on the display module side in chronological order. Then, a frame interpolation calculation is performed using the display data of the plurality of frames, and the display data of the interpolation frame corresponding to the display area assigned to the display module is obtained from the display data of the interpolation frame obtained by the frame interpolation calculation. A video display device equipped with a data processing unit for extraction. The data processing unit uses the display data of the interpolation frame corresponding to the display area assigned to the display module included in the data processing unit, and uses the display data of the display data of the display area assigned to the display module. The image display device according to claim 1, wherein the frame interpolation operation of multiplying the rate and drawing is performed. A video display device connected to a signal source of a video signal and arranging a plurality of display modules to form one display screen.
The signal source distributes display data of all display areas of the display screen to each display module.
Each display module extracts a plurality of frames of display data of a calculation area including a display area allocated to the display module and a display area allocated to a display module adjacent to the display module on the display module side in chronological order. Then, an overdrive image calculation is performed using the display data of the plurality of frames, and the display data corresponding to the display area allocated to the display module is extracted from the display data obtained by the overdrive image calculation. An image display device equipped with a unit. Each display module further includes a reception unit that receives a setting of the size of the calculation area.
The video display device according to claim 2, wherein the data processing unit switches the operating frequency of the frame interpolation operation according to the size of the calculation area received by the reception unit. The video display device according to claim 3, wherein each display module further includes a reception unit that receives a setting of the size of the calculation area.

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