JP2012022226A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device capable of partly refining an moving image in resolution.SOLUTION: An image display device includes: a display part that displays at least one of an original image based on an input image signal and an interpolation image based on an interpolation image signal on a display area including a plurality of small divided regions; and an interpolation image generating part that generates an interpolation image signal by determining an interpolation phase for each small divided region. The display part includes a first sectional area and a second sectional area each of which has a plurality of small divided regions; on the first sectional area, an image is displayed at a rate equal to or higher than the input frame rate of the input image signal; on the second sectional area, an image is displayed at a rate higher than that on the first sectional area. In at least a part of an interpolation image displayed on the second sectional area, a small divided region adjacent to the first sectional area has an interpolation phase closer to the phase of an original image than a small divided region apart from the first sectional area does.

Description

  The present invention relates to an image display apparatus that displays an image by writing scanning.

  An active liquid crystal display device that is a hold-type display method has an advantage of less flickering and less eye fatigue than an impulse-type display method such as a CRT (Cathode Ray Tube) display device.

  On the other hand, with regard to moving-image display in the hold-type display method, a moving image is perceived as an image integrated over the number of pixels moving between frames, and the integration caused by the movement of the image causes blurring of the image. Has been reported (see, for example, Patent Document 1 and Patent Document 2). The reason for this is that in human visual characteristics, light stimuli within a few tens of milliseconds are usually perceived as being almost completely integrated, and movements within 4-5 degrees / second can be tracked only by eye movements. There are some points.

  As a method for improving the unnaturalness of the image in the moving image display as described above, an interpolated image signal is generated adaptively from the preceding and following input image signals, and the generated interpolated image signals are used as the two input image signals. In addition, there has been reported an image interpolation method in which images are sequentially used and displayed (see, for example, Patent Document 1 and Patent Document 3).

  Here, a conventional image display method based on the image interpolation method will be described. In the following description of FIG. 12, it is assumed that images are displayed with sequential writing.

  FIG. 12A shows double-speed driving in an image display apparatus having 1080 scanning lines as a first example of a conventional image display method. Specifically, a double-speed line sequential drive in which the display frame rate is increased to twice the input frame rate is shown below, and for comparison, a line equal to the input frame rate without being increased in display frame rate. Sequential driving (hereinafter referred to as “constant speed sequential driving”) is shown in the upper part. In the following description, the input frame rate represents the rate of the input image signal input to the image processor of the image display device in units of frames, and the display frame rate is output from the display panel of the image display device. The rate of the image to be displayed is expressed in units of frames.

  In the constant-speed line sequential driving shown in the upper part of FIG. 12A, a plurality of frames (first frame and second frame) are sequentially displayed as an image based on an input image signal (hereinafter referred to as “original image”). On the other hand, in the double speed line sequential driving shown in the lower part of FIG. 12A, a plurality of frames (first frame and second frame) are displayed as an original image based on the input image signal. In addition to this, intermediate frames (first intermediate frame and second intermediate frame) are interpolated and displayed as an image based on the interpolated image signal obtained from the input image signal (hereinafter referred to as “interpolated image”). Is done.

  As described above, in the double-speed line sequential driving, since one frame of the interpolated image is additionally displayed with respect to one frame of the original image, the display frame rate becomes twice the input frame rate. Therefore, in the moving image displayed on the screen, the blur of the image can be reduced by interpolating the first intermediate frame between the first frame and the second frame.

  FIG. 12B shows quadruple speed driving in an image display apparatus having 1080 scanning lines as a second example of the conventional image display method. Specifically, quadruple-speed line sequential driving in which the display frame rate is increased to four times the input frame rate is shown in the lower part, and constant-speed line sequential driving is shown in the upper part for comparison.

In the constant speed sequential driving shown in the upper part of FIG. 12B, a plurality of frames (first frame and second frame) are sequentially displayed as an original image. On the other hand, in the quadruple speed line sequential driving shown in the lower part of FIG. 12B, a plurality of frames (first frame and second frame) are displayed as the original image. In addition, a plurality of intermediate frames (first _1st intermediate frame, 1st _2nd intermediate frame, 1st _3rd intermediate frame, 2nd _1st intermediate frame, 2nd _2nd intermediate frame, and 2nd _3rd intermediate frame) are interpolated as an interpolated image. Interpolated between frames.

  As described above, in the quadruple-speed line sequential driving, since three frames of the interpolated image are additionally displayed with respect to one frame of the original image, the display frame rate is four times the input frame rate. Therefore, the quadruple-speed line sequential driving can further reduce image blur than the double-speed line sequential driving.

Japanese Patent No. 3295437 JP-A-9-325715 Japanese Patent No. 388885

  However, in the above conventional image display method, it is necessary to increase the scanning speed in order to realize display at a frame rate higher than the input frame rate.

  For example, in the case of constant speed line sequential driving, scanning is performed at a vertical scanning frequency of 60 Hz, assuming that the input frame rate is 60 Hz. Therefore, in an image display device having 1080 scanning lines, the line scanning period, which is the scanning time per scanning line, is about 15.4 μs.

  On the other hand, in the case of double-speed line sequential driving, it is necessary to perform scanning at a vertical scanning frequency of 120 Hz under the same assumption conditions. Therefore, in an image display device having 1080 scanning lines, the line scanning period is about 7.7 μs.

  Similarly, in the case of quadruple-speed line sequential driving, it is necessary to perform scanning at a vertical scanning frequency of 240 Hz under the same assumption conditions. Therefore, in the image display device having 1080 scanning lines, the line scanning period is about 3.9 μs.

  As described above, in order to increase the display frame rate to 2 times, 4 times, or more, the line scanning period of all the scanning lines is reduced to 1/2 times, 1/4 times, or even less. It needs to be shortened. That is, a multiple of the frame rate and the line scanning cycle are in an inversely proportional relationship. However, the scanning speed of the scanning line has a limit value that depends on the response of the display panel, and it is difficult to scan at a high speed exceeding the limit value. Therefore, with the double-speed line sequential driving used in the conventional image display method, it is difficult to realize high frame rate driving, and there is a certain limit to high definition such as reduction of motion image blur.

  An object of the present invention is to provide an image display device that can partially increase the definition of a moving image while making the boundary inconspicuous.

In order to achieve the above object, an image display device according to the present invention provides:
An image signal processing unit for generating an interpolated image signal from the input image signal;
A display area including a plurality of divided small areas, and a display unit that sequentially displays an image including at least one of an original image based on an input image signal and an interpolated image based on an interpolated image signal,
The image signal processing unit determines the phase of the interpolated image for each of the divided small regions and generates the interpolated image signal;
The display unit includes a first segmented region and a second segmented region each including a plurality of the divided small regions, and the first segmented region has an image at a rate equal to or higher than an input frame rate of the input image signal. In the second segmented area, an image is displayed at a higher rate than in the first segmented area.
At least a portion of the interpolated images displayed in the second segmented region has a phase of the interpolated image displayed in the divided small region adjacent to the first segmented region separated from the first segmented region. It is closer to the phase of the original image than the phase of the interpolated image displayed in the divided small area.

  According to the present invention, there is provided an image display device capable of partially increasing the definition of a moving image while making the boundary inconspicuous.

Block diagram showing the configuration of the image display device Block diagram showing the configuration of the image signal processing unit The figure explaining the complementary phase in the case of interpolating one complementary image between two original images (A) The figure for demonstrating the structure of a display panel, (b) The elements on larger scale of an individual display area Explanatory drawing explaining the display state of the image display apparatus which concerns on Embodiment 1. FIG. The figure which shows the complementary phase of the 1st complementary image displayed on a division | segmentation small area | region. Explanatory drawing explaining another display state of the image display apparatus which concerns on Embodiment 1. FIG. The figure which shows the complementary phase of the 1st complementary image displayed on the division | segmentation small area | region in another display state. Explanatory drawing explaining the display state of the image display apparatus which concerns on Embodiment 2. FIG. The figure explaining the complementary phase in the case of interpolating three complementary images between two original images The figure which shows the complementary phase of the 1st _1st complementary image displayed on a division | segmentation small area | region, and a 1st _3rd complementary image The figure which shows the drive method in the conventional image display apparatus

    Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
<1. Configuration of Image Display Device>
FIG. 1 is a block diagram showing the configuration of the image display apparatus according to this embodiment. The image display apparatus 100 includes an image signal processing unit 110, a panel control circuit 120, a gate driver 130, a source driver 140, and a display panel 150.

  The image signal processing unit 110 generates a complementary image that is interpolated between two original images that are included in the input image signal and are temporally changed.

  FIG. 2 is a block diagram illustrating a configuration of the image signal processing unit. As illustrated in FIG. 2, the image signal processing unit 110 includes a motion vector detection circuit 111, an interpolation phase determination circuit 112, and an interpolation image generation circuit 113. The motion vector detection circuit 111 detects a motion vector between two original images moving back and forth in time for each block. Here, the block is a pixel area having a predetermined size such as 3 pixels × 3 pixels. Of course, the size of the block is not limited to 3 pixels × 3 pixels. For example, it may be a smaller block such as one pixel unit, or may be a larger block such as 8 pixels × 8 pixels.

  The complementary phase determination circuit 112 determines a complementary phase for each divided small region of the complementary image generated by the image signal processing unit 110. Although details of the divided small areas will be described later, the small areas are obtained by dividing the display area of the display panel 150 in the vertical direction.

Here, the complementary phase will be described with reference to FIG. The phase is a value indicating the temporal position of the image. The interpolation phase is a value indicating the temporal position of the interpolation image. FIG. 3 is a diagram illustrating a complementary phase when one complementary image is interpolated between two original images that are temporally continuous. 3 (a) is the original image 1 is displayed at time T _1, the original image 2 shows a state displayed on the time T _3. In the original image 1, an object indicated by P in the figure is located on the left side of the image. In the original image 2, the object P is located on the right side of the image. That is, in the original image 1 to the original image 2, the object P represents an object that moves from the left side to the right side. Here, the phase of the original image 1 is 0.0, and the phase of the original image 2 is 1.0. Figure 3 (b) ~ (f), the intermediate time T _2, the complementary image is the time T ₁ and time T ₃ indicates the manner in which displayed interpolated. In FIG. 3B, the object P is located at a position moved by 1/10 from the position of the original image 1 to the right side. That is, the complementary phase in FIG. 3B is 0.1. In FIG. 3C, the object P is located at a position moved by 2/10 to the right from the position of the original image 1. That is, the complementary phase in FIG. 3C is 0.2. In FIG. 3D, the object P is located at a position moved by 3/10 to the right from the position of the original image 1. That is, the complementary phase in FIG. 3D is 0.3. In FIG. 3E, the object P is located at a position moved by 4/10 to the right from the position of the original image 1. That is, the complementary phase in FIG. In FIG. 3 (f), the object P is located 5/10 from the position of the original image 1 to the right side, that is, at a position just moved by half. That is, the complementary phase in FIG. In FIG. 3, the complementary phase increases from the phase of the original image 1 as it goes from (b) to (f). That is, the complementary phase of the complementary image in FIG. 3B is closest to the phase of the original image, and the complementary phase of the complementary image in FIG. 3F is farthest from the phase of the original image. Although not shown, when the complementary phase is 0.6 or more and less than 1.0, it approaches the phase of the original image 2, and therefore the complementary phase of the complementary image in FIG. There is no change in being far away.

  The interpolation phase is a value used when generating the interpolation image, and may be different from the phase at which the interpolation image is displayed as shown in FIGS.

  In FIG. 3, the complementary phase in FIG. 3F is referred to as a normal phase. The normal phase is a phase that is logically calculated from the ratio between the frame rate of the original image only and the frame rate after interpolation of the complementary image, and the temporal position where the images after the frame rate conversion are continuous at equal intervals. It is a phase which shows. In other words, the normal phase is a complementary phase in the case where it matches the phase at which the interpolation image is displayed.

  Returning to FIG. The complementary image generation circuit 113 generates an interpolation image by performing a motion compensation process using at least one of the two original images using the interpolation phase and the motion vector.

  The interpolated image generation circuit 113 adjusts the motion vector of the block included in the divided small area according to the complementary phase for each divided small area determined by the interpolation phase determining circuit 112. Then, the interpolation image generation circuit 113 generates a complementary image in which the complementary phase is adjusted for each divided small region. Specifically, the interpolation image generation circuit 113 generates and outputs an interpolated image signal indicating a complementary image.

  The interpolated image generation circuit 113 performs an interpolated image signal generation process on sequentially input image signals. Here, an example of the interpolation image signal generation process performed by the interpolation image generation circuit 113 will be described.

  The interpolated image generation circuit 113 sequentially receives input image signals. The input image signal is temporarily stored in a memory (not shown) in the interpolation image generation circuit 113. The interpolated image generation circuit 113 receives one or more interpolated image signals from the previously input image signal, the input image signal input immediately after the input image signal, and the motion vector value and the complementary phase. Is generated. Each input image signal has an information amount that covers the entire display area of the display panel 150, and an interpolated image signal generated therefrom has an information amount that covers the entire display area. Alternatively, the information amount may cover only a part of the area.

  When generating an interpolated image signal having an information amount that covers only a partial region, a portion corresponding to the partial region of the display region is extracted from each input image signal, and the information contained in the extracted portion is obtained. Based on this, an interpolated image signal having an information amount covering only the partial area is generated. Alternatively, an interpolated image signal having an information amount covering the entire area is provisionally generated from each input image signal, and a portion corresponding to a partial area of the display area is cut out as a final interpolated image signal. .

  Note that a partial area of the display area covered by the interpolated image signal is selected adaptively based on the motion vector detected by the motion vector detection circuit 111. For example, a telop may be detected from the detected motion vector, and a partial region including the telop may be set.

  The interpolated image generation circuit 113 generates a phase signal based on the input image signal and the generated interpolated image signal. Here, the phase signal indicates the start position of sequential scanning that proceeds from the upper scanning line toward the lower scanning line. For example, it is indicated that the scan should be started from the first line, or that the scan should be started from the 217th line. The scanning line will be described later.

  Then, the interpolation image generation circuit 113 outputs the input image signal, the interpolation image signal, and the phase signal to the panel control circuit 120.

  In this way, the image signal processing unit 110 performs the interpolated image signal generation process. The interpolated image signal generation process is performed every time an input image signal is input.

  The panel control circuit 120 controls the driving of the gate driver 130 and the source driver 140 based on the input image signal (input image signal or interpolated image signal) and phase signal. Specifically, control signals such as control of image signal supply timing to the source line 157 of the display panel 150 and control of write timing to the scanning line 156 are generated and output to the gate driver 130 and the source driver 140. To do.

  Further, the panel control unit 120 displays the image at a rate equal to or higher than the input frame rate of the input image signal in the first divided area of the display area, and the second divided area different from the first divided area. , The driving of the gate driver 130 and the source driver 140 is controlled so as to display an image at a higher rate than the first segmented area.

  The gate driver 130 drives the scanning lines 156 included in the display panel 150 based on the control from the panel control unit 120. The source driver 140 drives the source line 156 included in the display panel 150 based on control from the panel control unit 120. The gate driver 130 is an example of a scanning unit.

  The display panel 150 is a liquid crystal panel. More specifically, the display panel 150 includes 1080 scanning lines 156-1 to 156-1080 and 1920 source lines 157-1 to 157-1920 which are arranged orthogonal to each other. The display panel 150 forms a pixel having a liquid crystal cell (not shown) at the intersection of each scanning line and each source line. An image signal is supplied to the source lines 157-1 to 157-1920. Then, the scanning lines 156-1 to 156-1080 sequentially scan the pixels of the same line, whereby an image corresponding to the image signal can be displayed in the display area. When the scanning line 156-n (n is an integer from 1 to N) is scanned by the gate driver 130, the display area of the display panel 150 includes a frame as an original image based on the input image signal and an interpolated image signal. An intermediate frame as an interpolated image is displayed.

  FIG. 4A is a configuration diagram for explaining the configuration of the display panel 150. The display panel 150 has a display area composed of five individual display areas 151 to 155 divided in the vertical direction. The individual display area 151 is an area corresponding to the scanning lines 156-1 to 156-216. The individual display area 152 is an area corresponding to the scanning lines 156-217 to 156-432. The individual display area 153 is an area corresponding to the scanning lines 156-433 to 156-648. The individual display area 154 is an area corresponding to the scanning lines 156-649 to 156-864. The individual display area 155 is an area corresponding to the scanning lines 156-865 to 156-1080. Each individual display area has 27 divided small areas. This will be described with reference to FIG.

  FIG. 4B is a partially enlarged view of the individual display area 155. The individual display area 155 has 27 divided small areas 155-1 to 155-27. Each of the divided small areas is an area corresponding to eight scanning lines. The divided small region 155-1 is a region corresponding to the scanning lines 156-865 to 156-872. The divided small area 155-2 is an area corresponding to the scanning lines 156-873 to 156-880. Similarly, the divided small areas 155-27 are areas corresponding to the scanning lines 156-1073-156-1080. That is, the display panel 150 has five individual display areas, and each individual display area has 27 divided small areas, and thus has a total of 135 divided small areas.

  In the display panel 150, the scanning timing of each scanning line 156 and the image signal supply timing of each source line 157 are controlled by the panel control circuit 120. In particular, the display panel 150 is controlled such that the timing of writing scanning can be changed for each individual display area.

  The configuration of the image display apparatus 100 according to the present embodiment has been described above.

<2. Operation of image display device>
Next, the operation of the image display apparatus 100 will be described. In this embodiment and the following embodiments, the input frame rate of 60 Hz is a precondition for the sake of simplification of explanation, but the present invention can also be applied to a scanning drive operation under other conditions. It is.

  FIG. 5 is an explanatory diagram for explaining the display state of the image display apparatus 100. In the following, a case will be described in which the motion amount of the individual display region 155 is larger than the motion amount of the other individual display regions (the motion is faster) and the frame rate of the individual display region 155 is increased. That is, the individual display areas 151 to 154 are an example of a first segment area that displays an image at a rate equal to or higher than the input frame rate of the input image signal, and the individual display area 155 has a higher rate than the first segment area. It is an example of the 2nd division field which displays a picture. In the present embodiment, images are displayed at 60 Hz, which is the same as the input frame rate, in the individual display areas 151 to 154 that are examples of the first segment area, and the individual display areas 155 that are examples of the second segment area are the first It is assumed that an image is displayed at 120 Hz, which is higher than one segment area.

  More specifically, FIG. 5 shows the timing of writing an image signal to the display panel 150. Here, it is necessary to display an image at a high rate for the second segment area. For this reason, the writing scan of the image signal to the display panel 150 is faster than the writing scan in the case where the entire display area displays an image at 60 Hz.

First, writing corresponding to the individual display area 151 of the first original image signal at time t ₁₀ begins. Here, scanning lines 156-1 to 156-216 are written. Subsequently, it begins writing corresponding to the individual display area 152 at time _{t 121.} Here, the scanning lines 156-217 to 156-432 are written (S 11). Then, at time _t122 , the individual display area 153 and the individual display area 154 are skipped, and writing corresponding to the individual display area 155 starts. Here, scanning lines 156-865 to 156-1080 are written (S12). After that, at time _t123 , the display returns to the individual display area 153 and corresponding writing starts. Here, scanning lines 156-433 to scanning lines 156-648 are written. Subsequently, it begins writing corresponding to the individual display area 154 at time _{t 124.} In this case, scanning lines 156-649 to 166-865 are written (S13). In this way, the writing scan of the first original image signal is completed.

Here, writing to the individual display area 155 starts again from time t ₁₂₅ . Here, scanning lines 156-865 to 156-1080 are written (S14). The image signal written at this time is the first complementary image signal. The first complementary image signal is a complementary image generated as an interpolated image between the first original image and the second original image. In this way, it is possible to double the number of write scans for only the individual display area 155 with a large amount of motion within one frame period of the input image signal. That is, the display rate of only the individual display area 155 can be increased.

Writing corresponding to the individual display area of the second original image signal at time t ₂₀ in the same manner starts. The following writing scan is the same as in the case of the first original image signal and the first complementary image signal. The write corresponding to the individual display area of the third original image signal at time t ₃₀ in the same manner starts. The following writing scan is the same as in the case of the first original image signal and the first complementary image signal.

  FIG. 6 is a diagram illustrating the complementary phase of the first complementary image displayed in the divided small areas 155-1 to 155-27, which are the divided small areas included in the individual display area 155. That is, the complementary phase of the complementary image displayed by the complementary image displayed by writing the first complementary image signal shown in S14 in FIG. 5 is shown. In FIG. 6, the horizontal axis indicates the complementary phase, and the vertical axis indicates the code of the divided small area. The divided small area 155-1 is a divided small area located at the uppermost end of the individual display area 155, and is a divided small area adjacent to the individual display area 154. The divided small area 155-27 is a divided small area located at the lowermost end of the individual display area 155. Note that the phase of the first original image displayed by the first original image signal in FIG. 5 is 0.0, and the phase of the second original image displayed by the second original image signal is 1.0.

  The complementary phase of the complementary image in the divided small area 155-1 is 0.1, which is closest to the phase of the original image compared to the other divided small areas. The complementary phase of the complementary image in the divided small region 155-2 is 0.2, which is farther from the phase of the original image than the divided small region 155-1. The complementary phase of the complementary image in the divided small region 155-3 is 0.3, which is farther from the phase of the original image than the divided small region 155-2. The complementary phase of the complementary image in the divided small region 155-4 is 0.4, which is farther from the phase of the original image than the divided small region 155-3. All the complementary phases of the complementary images in the divided small areas 155-5 to 155-27 are 0.5, which is a normal phase. In other words, the complementary phase of each divided small area in the individual display area 155 that is the second segment area is closer to the individual display area 154 in the vicinity of the boundary with the individual display area 154 that is a part of the first segment area. Close to the phase. In other words, the complementary phase of each divided small region in the individual display region 155 that is the second segmented region is closer to the individual display region 154 that is a part of the first segmented region and the boundary between the individual display region 154 and the original image. It is far from the phase. In this way, by adjusting the complementary phase for each divided small region of the second partitioned region, the boundary between the first partitioned region and the second partitioned region can be made inconspicuous.

  In the vicinity of the boundary with the individual display area 154, the change amount of the complementary phase for each divided small area of the individual display area 155 is set to 0.1, and the normal phase is obtained through the four divided small areas. However, it is not limited to this. For example, the change amount of the complementary phase for each divided small region may be set to a larger change amount, and the normal phase may be obtained through a smaller divided small region. Alternatively, the change amount of the complementary phase for each divided small region may be set to a smaller change amount so that the normal phase is obtained through more divided small regions.

  Thus, in the image display device 100 according to the present embodiment, an image is displayed at the same display rate as the frame rate of the input image signal in the first segment area of the display panel 150, and partially in the second segment area. Images can be displayed at a higher frame rate.

  In the above description, the individual display areas 151 to 154 are the first segment areas that display images at a rate equal to or higher than the input frame rate of the input image signal, and the individual display areas 155 are different from the first segment area. However, the first segmented area and the second segmented area can of course be combined with another individual display area. For example, FIG. 7 is an explanatory diagram illustrating another display example of the image display device 100. In FIG. 7, the individual display areas 151 to 152 and 154 to 155 are first segment areas, and the individual display area 153 is a second segment area. According to such an example, the individual display area 153 can be displayed at a display rate of 120 Hz, and the other individual display areas can be displayed at a display rate of 60 Hz.

  In the example of FIG. 7, the individual display area 153 that displays the complementary image is adjacent to the first segment area on the upper end side and the lower end side. FIG. 8 is a diagram illustrating a complementary phase of the first complementary image displayed in the divided small areas 153-1 to 153-27, which are the divided small areas included in the individual display area 153 in the example of FIG. The divided small area 153-1 is a divided small area located at the uppermost end of the individual display area 153 and is a divided small area adjacent to the individual display area 152. The divided small area 153-27 is a divided small area located at the lowermost end of the individual display area 155, and is a divided small area adjacent to the individual display area 154.

  The complementary phase of the complementary image in the divided small region 153-1 is 0.1, which is closer to the phase of the original image than other divided small regions. The complementary phase of the complementary image in the divided small region 153-2 is 0.2, which is farther from the phase of the original image than the divided small region 153-1. The complementary phase of the complementary image in the divided small region 153-3 is 0.3, which is farther from the phase of the original image than the divided small region 153-2. The complementary phase of the complementary image in the divided small region 153-4 is 0.4, which is farther from the phase of the original image than the divided small region 153-3. All of the complementary phases of the complementary images in the divided small areas 155-5 to 155-23 are 0.5, which is a normal phase. The complementary phase of the complementary image in the divided small region 153-24 is 0.4, which is closer to the phase of the original image than the divided small region 153-23. The complementary phase of the complementary image in the divided small region 153-25 is 0.3, which is closer to the phase of the original image than the divided small region 153-24. The complementary phase of the complementary image in the divided small region 153-26 is 0.2, which is closer to the phase of the original image than in the divided small region 153-25. The complementary phase of the complementary image in the divided small region 153-27 is 0.1, which is closer to the phase of the original image than the divided small region 153-26, and is in the phase of the original image compared to the other divided small regions. It ’s close.

  That is, the complementary phase for each divided small area in the individual display area 153 that is the second segment area is displayed in the individual display areas 152 and 154 in the vicinity of the boundary with the individual display areas 152 and 154 that are part of the first segment area. The closer it is, the closer to the phase of the original image. In other words, the complementary phase of each divided small area in the individual display area 153 that is the second segment area is different from the individual display areas 152 and 154 that are in the vicinity of the boundary with the individual display areas 152 and 154 that are part of the first segment area. The farther away, the farther from the phase of the original image. In this way, by adjusting the complementary phase for each divided small region of the second partitioned region, the boundary between the first partitioned region and the second partitioned region can be made inconspicuous.

  Note that it is preferable that the writing scan of the complementary image signal in the second segmented region is written at a timing such that the intervals of the writing scans in the second segmented region are as uniform as possible. In FIG. 5 and FIG. 7 described above, the intervals between the write scans in the second segmented region are uniform. That is, the image display device 100 displays the original image and the complementary image at equal intervals. As described above, since the interpolation positions of the complementary images are equalized, the moving image can be displayed more smoothly.

<3. Summary>
As described above, the image display apparatus 100 includes the image signal processing unit 110 that generates an interpolated image signal from the input image signal, and the original image and the inner image based on the input image signal in the display area including a plurality of divided small areas. And a display panel 150 that sequentially displays images including at least one of the interpolated images based on the inserted image signal. The image signal processing unit 110 determines the phase of the interpolation image for each divided small region and generates an interpolated image signal. The display panel 150 has a first segmented region and a second segmented region each including a plurality of divided small regions, and the first segmented region displays an image at a rate equal to or higher than the input frame rate of the input image signal. In the second segment area, images are displayed at a higher rate than in the first segment area. Then, at least a part of the interpolated images displayed in the second segmented region is divided so that the phase of the interpolated image displayed in the divided small region adjacent to the first segmented region is separated from the first segmented region. It is closer to the phase of the original image than the phase of the interpolated image displayed in the small area.

  Thus, by having the first segmented region and the second divided region, it is possible to partially increase the definition of the moving image. Further, the phase of the interpolated image displayed in the divided small area adjacent to the first divided area is closer to the phase of the original image than the phase of the interpolated image displayed in the divided small area separated from the first divided area. Thus, the boundary between the first segmented region and the second segmented region can be made inconspicuous.

  In addition, at least a part of the interpolated images displayed in the second segmented area is divided into small segments adjacent to the first segmented area among a plurality of segmented small areas located near the boundary with the first segmented area. The phase of the interpolated image displayed in the region is closest to the phase of the original image, and the farther from the phase of the original image, the farther from the first segmented region. Thereby, the boundary between the first segmented region and the second segmented region can be made less noticeable.

  In addition, at least some of the interpolated images displayed in the second segmented region are interpolated as the distance from the first segmented region increases in the plurality of divided small regions located near the boundary with the first segmented region. The phase of the interpolated image is the normal phase in the divided small regions that are farther from the phase of the original image and are further away from the first divided region than the plurality of divided small regions located near the boundary. Thereby, the improvement of the moving image performance in the second segmented region can be enhanced as much as possible while making the boundary between the first segmented region and the second segmented region less noticeable.

  In addition, the display panel 150 includes a plurality of scanning lines 156, and further includes a gate driver 130 that displays an image on the display area by scanning the plurality of scanning lines 156, and each of the divided small areas is at least one. The region corresponds to more than one scanning line 156.

  Further, a feature amount detection unit that detects a feature amount of the input image signal may be provided, and the second divided region may be selected based on the feature amount. In the present embodiment, the feature amount detection unit is the motion vector detection circuit 111, and detects the motion amount of the image for each individual display area as the feature amount. Then, the display panel 150 may display an image with an individual display area whose movement amount is greater than a predetermined amount as compared to other individual display areas as the second segment area. In this way, the second segment area can be set adaptively according to the feature of the image.

  The feature amount detection unit may detect the presence or absence of a telop for each individual display area as a feature amount. In this case, when there is an individual display area where a telop exists, the display panel 150 displays an image with the individual display area as the second segment area. In this way, it is possible to detect a telop area that requires more improvement in moving image performance and set it as the second segment area. The second segment area may be an area including a lower area of a display area where the occurrence frequency of telop is high.

(Embodiment 2)
Next, an image display apparatus according to Embodiment 2 will be described. The configuration of the image display apparatus according to the present embodiment is the same as that of the first embodiment shown in FIG. In the present embodiment, the display rate of the display panel 150 is different from that in the first embodiment.

  The display state of the image display apparatus 100 according to the present embodiment will be described with reference to FIG. FIG. 9 is an explanatory diagram illustrating a display state of the image display device 100. In the following description, the movement amount of the individual display area 155 is larger than the movement amount of the other individual display areas (the movement is faster), and the frame rate of the individual display area 155 is compared with that of the other individual display areas. The case where it raises is demonstrated. That is, the individual display areas 151 to 154 are an example of a first segment area that displays an image at a rate equal to or higher than the input frame rate of the input image signal, and the individual display area 155 has a higher rate than the first segment area. It is an example of the 2nd division field which displays a picture. In the present embodiment, images are displayed at 120 Hz, which is twice the input frame rate, in the individual display areas 151 to 154 as an example of the first segment area, and in the individual display area 155 as an example of the second segment area. Assume that an image is displayed at 240 Hz, which is higher than that of the first segment area.

  More specifically, FIG. 9 shows the timing of writing an image signal to the display panel 150. Here, it is necessary to display an image at a high rate for the second segment area. Therefore, the writing scan of the image signal to the display panel 150 is faster than the writing scan in the case where the entire display area displays an image at 120 Hz.

The basic operation of the image display apparatus 100 according to the present embodiment is the same as that of the first embodiment, except that the number of times of interpolating a complementary image is large. In the first embodiment shown in FIG. 5, the writing scanning of the write scan a first complementary image signal of the first original image signal is completed at time t _20. In contrast, in the present embodiment, the writing scanning similar first original image signal of the write scan the first ₁ complement image signal is completed at time t _123. Subsequently, by the same writing scan, the writing scan of the first and _second complementary image signals is performed on each individual display area, and the writing scan of the first and _third complementary image signals is performed on the individual display area 155. The first ₃ writing scanning is completed time of the complementary image signal at this time it is in the t _20.

Here, the complementary phase of the complementary image related to the present embodiment will be described with reference to FIG. FIG. 10 is a diagram illustrating a complementary phase when three complementary images are interpolated between two temporally continuous original images. 10 (a) is the original image 1 is displayed at time T _1, the original image 2 shows a state displayed on the time T _3. In the original image 1, an object indicated by P in the figure is located on the left side of the image. In the original image 2, the object P is located on the right side of the image. That is, in the original image 1 to the original image 2, the object P represents an object that moves from the left side to the right side. Here, the phase of the original image 1 is 0.0, and the phase of the original image 2 is 1.0. Figure 10 (b) ~ (f) are, together with the complementary image 2 regular phase is inserted into the time _{T 2,} which is an intermediate between the time _{T 1} and time _{T 3,} at the middle of the time _{T 1} and time _{T 2,} A state is shown in which the complementary image 1 and the complementary image 3 are interpolated and displayed at a certain time T ₁₅ and a time T ₂₅ that is intermediate between the time T ₂ and the time T ₃ . In FIG. 10B, the complementary image 1 is located at a position where the object P has moved to the right by 1/20 from the position of the original image 1. That is, the complementary phase of the complementary image 1 in FIG. In FIG. 10C, the complementary image 1 is located at a position where the object P has moved by 2/20 to the right from the position of the original image 1. That is, the complementary phase of the complementary image 1 in FIG. In FIG. 10D, the complementary image 1 is located at a position where the object P has moved by 3/20 to the right from the position of the original image 1. That is, the complementary phase of the complementary image 1 in FIG. In FIG. 10E, the complementary image 1 is located at a position where the object P has moved by 4/20 to the right from the position of the original image 1. That is, the complementary phase of the complementary image 1 in FIG. In FIG. 10F, the complementary image 1 is located at a position where the object P has moved 5/20 to the right from the position of the original image 1, that is, exactly ¼. That is, the complementary phase of the complementary image 1 in FIG. In FIG. 10, the complementary image 1 is further away from the phase of the original image 1 as it goes from (b) to (f). That is, the complementary phase of the complementary image 1 in FIG. 10B is closest to the phase of the original image 1, and the complementary phase of the complementary image 1 in FIG. 10F is farthest from the phase of the original image 1. The complementary phase of the complementary image 1 in FIG. 10F is a normal phase.

  In FIG. 10B, the complementary image 3 is located at a position where the object P has moved 19/20 to the right from the position of the original image 1. That is, the complementary phase of the complementary image 3 in FIG. 10B is 0.95. In FIG. 10C, the complementary image 3 is located at a position where the object P has moved 18/20 to the right from the position of the original image 1. That is, the complementary phase of the complementary image 3 in FIG. In FIG. 10D, the complementary image 3 is located at a position where the object P is moved to the right by 17/20 from the position of the original image 1. That is, the complementary phase of the complementary image 3 in FIG. 10D is 0.85. In FIG. 10E, the complementary image 3 is located at a position where the object P has moved 16/20 to the right from the position of the original image 1. That is, the complementary phase of the complementary image 3 in FIG. In FIG. 10F, the complementary image 3 is located at a position where the object P has moved 15/20 to the right from the position of the original image 1, that is, exactly 3/4. That is, the complementary phase of the complementary image 3 in FIG. In FIG. 10, the complementary image 3 is further away from the phase of the original image 2 as it goes from (b) to (f). That is, the complementary phase of the complementary image 3 in FIG. 10B is closest to the phase of the original image 2, and the complementary phase of the complementary image 3 in FIG. 10F is farthest from the phase of the original image 2. The complementary phase of the complementary image 3 in FIG. 10 (f) is a normal phase.

The complementary phase of the complementary image in the present embodiment will be described using the complementary phase described in FIG. FIG. 11A is a diagram illustrating the complementary phase of the _first complementary image displayed in the divided small areas 155-1 to 155-27, which are the divided small areas included in the individual display area 155. That is, the complementary phase of the complementary image displayed by the complementary image displayed by writing of the first _first complementary image signal shown in S14 in FIG. 9 is shown. The complementary image displayed by writing the first _first complementary image signal corresponds to the complementary image 1 in FIG. The divided small area 155-1 is a divided small area located at the uppermost end of the individual display area 155, and is a divided small area adjacent to the individual display area 154. The divided small area 155-27 is a divided small area located at the lowermost end of the individual display area 155. The phase of the first original image displayed by the first original image signal in FIG. 9 is 0.0, and the phase of the second original image displayed by the second original image signal is 1.0.

  The complementary phase of the complementary image in the divided small region 155-1 in FIG. 11A is 0.05, which is closest to the phase of the first original image compared to the other divided small regions. The complementary phase of the complementary image in the divided small region 155-2 is 0.1, which is farther from the phase of the first original image than the divided small region 155-1. The complementary phase of the complementary image in the divided small region 155-3 is 0.15, which is farther from the phase of the first original image than the divided small region 155-2. The complementary phase of the complementary image in the divided small region 155-4 is 0.2, which is farther from the phase of the first original image than the divided small region 155-3. All the complementary phases of the complementary images in the divided small regions 155-5 to 155-27 are 0.25 which is a normal phase.

11 (b) is a diagram showing the division is a small region, complementary phase of the _{first 3} complementary image displayed on the divided small regions 155-1～155-27 with the individual display area 155. That is, the complementary phase of the complementary image displayed by the complementary image displayed by writing the first _third complementary image signal shown in S24 in FIG. 9 is shown. The complementary image displayed by writing the first _third complementary image signal corresponds to the complementary image 3 in FIG. The divided small area 155-1 is a divided small area located at the uppermost end of the individual display area 155, and is a divided small area adjacent to the individual display area 154. The divided small area 155-27 is a divided small area located at the lowermost end of the individual display area 155. Note that the phase of the complementary image displayed by the writing of the ₁₂ complementary image signal in FIG. 9 is constant in all the divided small regions and is 0.5.

  The complementary phase of the complementary image in the divided small region 155-1 in FIG. 11B is 0.95, which is closest to the phase of the second original image compared to the other divided small regions. The complementary phase of the complementary image in the divided small region 155-2 is 0.9, which is farther from the phase of the second original image than the divided small region 155-1. The complementary phase of the complementary image in the divided small region 155-3 is 0.85, which is farther from the phase of the second original image than the divided small region 155-2. The complementary phase of the complementary image in the divided small region 155-4 is 0.8, which is farther from the phase of the second original image than the divided small region 155-3. The complementary phases of the complementary images in the divided small areas 155-5 to 155-27 are all 0.75 which is a normal phase.

  Thus, the complementary phase of each divided small area in the individual display area 155 that is the second segment area is closer to the individual display area 154 in the vicinity of the boundary with the individual display area 154 that is a part of the first segment area. Close to the phase of the original image. In other words, the complementary phase of each divided small region in the individual display region 155 that is the second segmented region is closer to the individual display region 154 that is a part of the first segmented region and the boundary between the individual display region 154 and the original image. It is far from the phase. In this way, by adjusting the complementary phase for each divided small region of the second partitioned region, the boundary between the first partitioned region and the second partitioned region can be made inconspicuous.

  Note that, in the vicinity of the boundary with the individual display area 154, the amount of change in the complementary phase for each divided small area of the individual display area 155 is set to 0.05, so that the normal phase passes through the four divided small areas. However, it is not limited to this. For example, the change amount of the complementary phase for each divided small region may be set to a larger change amount, and the normal phase may be obtained through a smaller divided small region. Alternatively, the change amount of the complementary phase for each divided small region may be set to a smaller change amount so that the normal phase is obtained through more divided small regions.

  In this way, the image display rate of the entire display area is doubled within one frame period of the input image signal, and the number of write scans for only the individual display area 155 having a particularly large amount of motion is further doubled. be able to. That is, the display rate of only the individual display area 155 can be increased four times.

  That is, in the image display device 100 of the present embodiment, an image is displayed at a display rate higher than the frame rate of the input image signal in the first segment area of the display panel 150, and partially in the second segment area. The present invention can also be applied to a case where an image is displayed at a higher frame rate.

  In the above description, the individual display areas 151 to 154 are the first segment areas that display images at a rate equal to or higher than the input frame rate of the input image signal, and the individual display areas 155 are different from the first segment area. However, the first segmented area and the second segmented area can of course be combined with another individual display area.

  In the above-described embodiment, the divided small area is an area corresponding to eight scanning lines, but is not limited thereto. For example, it may be an area corresponding to eight or more scanning lines, or an area corresponding to each scanning line.

  In the above-described embodiment, the display area included in the display panel includes five individual display areas, but is not limited thereto. For example, the number may be less than five or more than five.

  In the above-described embodiment, the second segment area corresponds to one individual display area, but may correspond to a plurality of individual display areas. According to such a configuration, it is possible to increase the definition of images at a plurality of locations in the display area.

  The embodiments of the present invention have been described above.

  The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. That is, the description of the configuration and operation of the above apparatus is an example, and it is apparent that various modifications and additions to these examples are possible within the scope of the present invention.

  For example, in each of the above embodiments, a liquid crystal display device using a liquid crystal panel has been described as an example of an image display device. However, the present invention is applicable to various active matrix display devices such as an organic EL display device using an organic EL panel. Is applicable.

  The present invention is suitable for increasing the definition of a moving image in an image display apparatus that displays the moving image.

DESCRIPTION OF SYMBOLS 100 Image display apparatus 110 Image signal processing part 111 Motion vector detection circuit 112 Complementary phase determination circuit 113 Complementary image generation circuit 120 Panel control circuit 130 Gate driver 140 Source driver 150 Display panel 151-155 Individual display area 156 Scan line 157 Source line

Claims (9)

An image signal processing unit for generating an interpolated image signal from the input image signal;
A display area including a plurality of divided small areas, and a display unit that sequentially displays an image including at least one of an original image based on an input image signal and an interpolated image based on an interpolated image signal,
The image signal processing unit determines the phase of the interpolated image for each of the divided small regions and generates the interpolated image signal;
The display unit includes a first segmented region and a second segmented region each including a plurality of the divided small regions, and the first segmented region has an image at a rate equal to or higher than an input frame rate of the input image signal. In the second segmented area, an image is displayed at a higher rate than in the first segmented area.
At least a portion of the interpolated images displayed in the second segmented region has a phase of the interpolated image displayed in the divided small region adjacent to the first segmented region separated from the first segmented region. Closer to the phase of the original image than the phase of the interpolated image displayed in the sub-region,
Image display device. At least a portion of the interpolated image displayed in the second segmented region is a segment adjacent to the first segmented region among a plurality of segmented small regions located in the vicinity of the boundary with the first segmented region. The phase of the interpolated image displayed in the small area is closest to the phase of the original image, and the farther from the phase of the original image, the farther from the first segmented area,
The image display device according to claim 1. At least some of the interpolated images displayed in the second segmented region are interpolated as the distance from the first segmented region increases in a plurality of divided small regions located near the boundary with the first segmented region. The phase of the interpolated image is the normal phase in the divided subregions that are farther from the phase of the original image and are separated from the first divided region than the plurality of divided subregions located near the boundary.
The image display device according to claim 1. The display unit has a plurality of scanning lines,
A scanning unit that displays an image on the display region by scanning the plurality of scanning lines;
The divided small regions are regions corresponding to at least one or more scanning lines,
The image display device according to claim 1. A feature amount detection unit for detecting a feature amount of the input image signal;
The second divided region is selected based on the feature amount.
The image display device according to claim 1. The feature amount detection unit detects a motion amount of the image for each individual display area as a feature amount,
The display unit displays an image with the individual display area having the amount of movement larger than the other individual display area by a predetermined amount or more as the second segment area.
The image display device according to claim 5. The feature amount detection unit detects the presence or absence of a telop for each individual display area as a feature amount,
The display unit displays an image using the individual display area as the second segment area when there is an individual display area in which a telop exists;
The image display device according to claim 5. The second segment area includes a lower area of the display area,
The image display device according to claim 1. The display unit is a liquid crystal panel.
The image display device according to claim 1.

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