JP2013101258A - Display device and display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device for enhancing the display quality.SOLUTION: A display device includes a display unit that is controlled so that display light is emitted from a display screen intermittently, and a control unit for controlling display light timing when the display light is emitted on the basis of movement quantity of an image to be displayed on the display unit. In the display device, the display light is emitted from the display screen of the display unit intermittently for performing display, and at that time, display light timing is controlled on the basis of movement quantity of an image to be displayed on the display unit.

Description

  The present disclosure relates to a display device that displays video and a display method thereof.

  A display device such as a television receiver sequentially displays the continuous still images based on a video signal composed of the continuous still images. Thus, in the display device, for example, when the continuous still image is obtained by sampling a smoothly moving object (moving object), the moving image of the moving object is displayed by sequentially displaying the continuous still image. Is reproduced in a pseudo manner.

  By the way, in general, when observing (following vision) while following a moving object in the natural world, a person moves the head or eyeball etc. smoothly and observes it. As a result, the moving body forms an image at the center of the retina of the eyeball. When the display device displays a moving object, the moving object on the screen moves discontinuously by the continuous still images that are sequentially displayed. However, even in this case, the person moves the moving object continuously and smoothly. It is known to observe while following smoothly.

  2. Description of the Related Art In recent years, a liquid crystal display device that has been a mainstay of display devices is a so-called hold type display device. That is, in such a display device, the same image continues to be displayed in one frame period from displaying a still image to displaying the next still image. Therefore, when an observer observes a moving object displayed on such a display device, he / she tries to observe the object while smoothly following it. Therefore, the image on the retina shows the center of the retina in the one frame period. It will move across. Thus, when a moving image is observed on such a display device, so-called hold blur occurs, and the observer feels that the image quality has deteriorated.

  Several studies have been made on methods for improving the hold blur. For example, Patent Document 1 discloses a liquid crystal display device that reduces the hold blur by shortening the slip length of the retina image by shortening the time during which the backlight is blinked and the image is held and displayed. Has been.

JP 2008-268436 A

  By the way, in the display device, further improvement in display image quality is desired. However, Patent Document 1 does not specifically describe the further improvement in display image quality.

  The present disclosure has been made in view of such a problem, and an object thereof is to provide a display device and a display method capable of improving display image quality.

  The display device of the present disclosure includes a display unit and a control unit. The display unit is controlled so that display light is intermittently emitted from the display screen. The control unit controls a display light timing at which the display light is emitted based on a motion amount of the video to be displayed on the display unit.

  The display method of the present disclosure detects the amount of motion of the video to be displayed on the display unit, controls the timing of display light emitted intermittently from the display screen based on the amount of motion, and performs video display It is.

  In the display device and the display method of the present disclosure, display is performed by intermittently emitting display light from the display screen of the display unit. At that time, the display light timing is controlled based on the amount of motion of the video to be displayed on the display unit.

  According to the display device and the display method of the present disclosure, the display light timing is controlled based on the amount of motion of the video to be displayed on the display unit, so that the display image quality can be improved.

FIG. 11 is a block diagram illustrating a configuration example of a display device according to an embodiment of the present disclosure. FIG. 2 is a block diagram illustrating a configuration example of a display driving unit and a liquid crystal display unit illustrated in FIG. 1. FIG. 3 is a circuit diagram illustrating a configuration example of a pixel illustrated in FIG. 2. It is a schematic diagram showing an operation example of the backlight drive unit according to the first embodiment. FIG. 5 is a timing waveform diagram illustrating an operation example of the display device illustrated in FIG. 4. FIG. 5 is a timing waveform diagram illustrating another operation example of the display device illustrated in FIG. 4. FIG. 10 is a timing waveform chart illustrating another operation example of the display device illustrated in FIG. 1. It is a schematic diagram showing the other operation example of the backlight drive part which concerns on 1st Embodiment. FIG. 9 is a timing waveform diagram illustrating an operation example of the display device in the example illustrated in FIG. 8. It is a schematic diagram showing the other operation example of the backlight drive part which concerns on 1st Embodiment. FIG. 11 is a timing waveform diagram illustrating an operation example of the display device in the example illustrated in FIG. 10. It is a schematic diagram showing the other operation example of the backlight drive part which concerns on 1st Embodiment. FIG. 13 is a timing waveform diagram illustrating an operation example of the display device in the example illustrated in FIG. 12. It is a schematic diagram showing the operation example of the backlight drive part which concerns on the modification of 1st Embodiment. It is a block diagram showing the example of 1 structure of the display apparatus which concerns on the other modification of 1st Embodiment. FIG. 16 is a timing waveform diagram illustrating an operation example of the display device illustrated in FIG. 15. It is a block diagram showing the example of 1 structure of the display apparatus which concerns on the other modification of 1st Embodiment. FIG. 18 is a schematic diagram illustrating an operation example of the backlight driving unit illustrated in FIG. 17. FIG. 18 is a timing waveform diagram illustrating an operation example of the display device illustrated in FIG. 17. It is a schematic diagram showing the operation example of the backlight drive part which concerns on 2nd Embodiment. It is a block diagram showing the example of 1 structure of the display apparatus which concerns on the modification of 2nd Embodiment. FIG. 23 is a schematic diagram illustrating an operation example of the backlight driving unit illustrated in FIG. 22. FIG. 12 is a timing chart illustrating an operation example of a display device according to a modification. It is a block diagram showing the example of 1 structure of the display apparatus which concerns on a modification.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be given in the following order.
1. First Embodiment 2. FIG. Second embodiment

<1. First Embodiment>
[Configuration example]
FIG. 1 illustrates a configuration example of a display device according to the first embodiment. The display device 1 is a transmissive liquid crystal display device having a backlight. The display method according to the embodiment of the present disclosure is embodied by the present embodiment, and will be described together.

  The display device 1 includes a control unit 11, a display drive unit 20, a liquid crystal display unit 30, a motion vector detection unit 12, a backlight drive unit 13, and a backlight 40.

  The control unit 11 is a circuit that controls the display drive unit 20, the motion vector detection unit 12, and the backlight drive unit 13 to operate in synchronization with each other based on the video signal Sdisp. Specifically, as will be described later, the control unit 11 supplies the video signal Sdisp and the display control signal to the display driving unit 20, and the video signal Sdisp and the motion vector detection control signal to the motion vector detection unit 12. And a backlight control signal is supplied to the backlight drive unit 13.

  The display driving unit 20 drives the liquid crystal display unit 30 based on the video signal Sdisp supplied from the control unit 11. The liquid crystal display unit 30 is a display unit configured by a liquid crystal display element, and performs display by modulating light emitted from the backlight 40.

  FIG. 2 illustrates an example of a block diagram of the display driving unit 20 and the liquid crystal display unit 30. The display driving unit 20 includes a timing control unit 21, a gate driver 22, and a data driver 23. The timing control unit 21 controls the driving timing of the gate driver 22 and the data driver 23 and supplies the video signal Sdisp supplied from the control unit 11 to the data driver 23 as the video signal Sdisp2. The gate driver 22 performs line-sequential scanning by sequentially selecting the pixels Pix in the liquid crystal display unit 30 for each row according to timing control by the timing control unit 21. The data driver 23 supplies a pixel signal based on the video signal Sdisp2 to each pixel Pix of the liquid crystal display unit 30. Specifically, the data driver 23 performs a D / A (digital / analog) conversion based on the video signal Sdisp2, thereby generating a pixel signal that is an analog signal and supplying the pixel signal to each pixel Pix. Yes.

  The liquid crystal display unit 30 is obtained by enclosing a liquid crystal material between two transparent substrates made of, for example, glass. A transparent electrode made of, for example, ITO (Indium Tin Oxide) or the like is formed on a portion of the transparent substrate facing the liquid crystal material, and constitutes a pixel Pix together with the liquid crystal material. As shown in FIG. 2, the liquid crystal display unit 30 has pixels Pix arranged in a matrix.

  FIG. 3 illustrates an example of a circuit diagram of the pixel Pix. The pixel Pix includes a TFT (Thin Film Transistor) element Tr, a liquid crystal element LC, and a storage capacitor element Cs. The TFT element Tr is configured by, for example, a MOS-FET (Metal Oxide Semiconductor-Field Effect Transistor), the gate is connected to the gate line GCL, the source is connected to the data line SGL, and the drain is the liquid crystal element LC. One end and one end of the storage capacitor element Cs are connected. The liquid crystal element LC has one end connected to the drain of the TFT element Tr and the other end grounded. The storage capacitor element Cs has one end connected to the drain of the TFT element Tr and the other end connected to the storage capacitor line CSL. The gate line GCL is connected to the gate driver 22, and the data line SGL is connected to the data driver 23.

  The liquid crystal display unit 30 is divided into three regions Z1 to Z3 as shown in FIG. As will be described later, the backlight drive unit 13 obtains a motion amount N indicating an image change for each of the regions Z1 to Z3.

  The motion vector detection unit 12 detects a motion vector indicating a change in an image based on a series of frame images supplied by the video signal Sdisp. Specifically, the motion vector detection unit 12 performs horizontal and vertical display contents in units of pixels, for example, based on image information of two temporally adjacent frame images in the supplied series of frame images. Directional motion is detected to determine a motion vector. The motion vector detection unit 12 outputs a series of motion vectors obtained for each pixel as a motion vector signal Sv. In this example, the motion vector is obtained in units of pixels. However, the present invention is not limited to this. For example, the motion vector is detected by detecting the motion of the display content in units of pixel blocks composed of a plurality of pixels. May be requested.

  The backlight drive unit 13 synchronizes the backlight 40 with the display on the liquid crystal display unit 30 based on the backlight control signal supplied from the control unit 11 and the motion vector signal Sv supplied from the motion vector detection unit 12. Thus, the backlight 40 is driven so as to emit light intermittently. Specifically, as will be described later, the backlight drive unit 13 integrates the magnitudes of the motion vectors of the respective pixels in each of the areas Z1 to Z3 based on the motion vector signal Sv. After obtaining the motion amount N of the video in each of Z3, the center of gravity position CG of the motion amount N in the line sequential scanning direction is obtained using them. And the backlight drive part 13 drives the backlight 40 so that the backlight 40 may light-emit at the timing according to the gravity center position CG.

  The backlight 40 emits light (blinks) intermittently based on a drive signal supplied from the backlight drive unit 13 and emits the light to the liquid crystal display unit 30. The backlight 40 can be configured using, for example, an LED (Light Emitting Diode). However, the present invention is not limited to this. For example, a CCFL (Cold Cathode Fluorescent Lamp) may be used.

  Here, the liquid crystal display unit 30 and the backlight 40 correspond to a specific example of “display unit” in the present disclosure. The backlight drive unit 13 corresponds to a specific example of “a control unit” in the present disclosure.

[Operation and Action]
Subsequently, the operation and action of the display device 1 of the present embodiment will be described.

(Overview of overall operation)
First, an overall operation overview of the display device 1 will be described with reference to FIG. The control unit 11 controls the display drive unit 20, the motion vector detection unit 12, and the backlight drive unit 13 to operate in synchronization with each other based on the video signal Sdisp. The display driving unit 20 drives the liquid crystal display unit 30. The liquid crystal display unit 30 performs display by modulating the light emitted from the backlight 40.

  The motion vector detection unit 12 detects a motion vector indicating a change in the image based on a series of frame images supplied by the video signal Sdisp, and generates a motion vector signal Sv. The backlight drive unit 13 drives the backlight 40 so that the backlight 40 emits light intermittently. At that time, the backlight drive unit 13 obtains the motion amount N of the video for each of the regions Z1 to Z3 based on the motion vector signal Sv, and then obtains the center of gravity position CG of the motion amount N in the line sequential scanning direction. And the backlight drive part 13 drives the backlight 40 so that the backlight 40 light-emits at the timing according to the gravity center position CG. The backlight 40 emits light based on the drive signal supplied from the backlight drive unit 13 and emits the light to the liquid crystal display unit 30.

(Detailed operation)
First, the operation of the backlight drive unit 13 will be described.

  FIG. 4 shows the operation of acquiring the center of gravity position CG in the backlight drive unit 13. Here, a case where the ball 9 moves in the display screen S will be described as an example. 4A to 4C show cases where the ball 9 moves in the areas Z1 to Z3 of the display screen S (cases C1 to C3), respectively.

  The motion vector detection unit 12 detects a motion vector Sv indicating a change in the image based on a series of frame images supplied by the video signal Sdisp. The backlight drive unit 13 first obtains the motion amount N of the video in each of the regions Z1 to Z3 based on the motion vector signal Sv.

  As shown in FIG. 4A, when the ball 9 moves in the area Z1 of the display screen S (case C1), the movement amount N is a large value in the area Z1 because there is movement only in the area Z1. (Right view of FIG. 4A). The backlight drive unit 13 obtains the center of gravity position CG1 based on the distribution of the movement amount N. That is, the gravity center position CG1 is the center position in the line sequential scanning direction of the region Z1.

  Similarly, when the ball 9 moves in the area Z2 of the display screen S (case C2), the amount of movement N becomes a large value in the area Z2 (FIG. 4B), and the area Z3 of the display screen S When the ball 9 moves (case C3), the amount of motion N is a large value in the region Z3 (FIG. 4C). The backlight drive unit 13 obtains the center-of-gravity positions CG2 and CG3 based on the distribution of the motion amount N, respectively.

  The backlight drive unit 13 drives the backlight 40 based on the center of gravity position CG (CG1 to CG3) acquired in this way.

  5A and 5B are timing charts of the display operation of the display device 1 in case C1, where FIG. 5A shows the operation of the liquid crystal display unit 30, and FIG. 5B shows the light transmission in the pixel Pix of the liquid crystal display unit 30. (C) shows the operation of the backlight 40.

  5A indicates the scanning position of the liquid crystal display unit 30 in the line sequential scanning direction. In FIG. 5A, for example, “F (n)” indicates that the liquid crystal display unit 30 displays the nth frame image F (n), and “F (n + 1)”. Indicates that the liquid crystal display unit 30 displays the (n + 1) -th frame image F (n + 1). In FIG. 5C, “ON” indicates that the backlight 40 is emitting light (light emission period PL), and “OFF” indicates that the backlight 40 is turned off.

  In the display device 1, line sequential scanning is performed at the period T 0, and the frame image F is displayed. Here, the period T0 can be set to 16.7 [msec] (= 1/60 [Hz]), for example. The period T0 is not limited to this. For example, the period T0 is 20 [msec] (= 1/50 [Hz]), 20.8 [msec] (= 1/48 [Hz]), or the like. Is possible.

  In the liquid crystal display unit 30, line sequential scanning is performed from the top to the bottom based on the drive signal supplied from the display drive unit 20 during the period of timing t0 to t1, and the frame image F (n) is displayed. Is performed (FIG. 5A). Thereby, the pixel Pix related to each horizontal line of the liquid crystal display unit 30 responds to the pixel signal during a period from when the pixel signal is written to when it is written next (display period Pdisp), and the display period Pdisp. The response is almost completed within the period.

  In case C1, as shown in FIG. 4A, the ball 9 is moving in the region Z1. This means that the pixel signal changes greatly for each frame period in the region Z1, while hardly changes in the regions Z2 and Z3. Therefore, in the horizontal line corresponding to the gravity center position CG1 located in the region Z1, as shown in FIG. 5B, the pixel signal is written in the pixel Pix at the timing t11, and the period (display) of the timing t11 to t12 is displayed. In the period Pdisp), the light transmittance changes in response to the pixel signal. On the other hand, in the regions Z2 and Z3, the light transmittance of the pixel Pix hardly changes.

  The backlight drive unit 13 drives the backlight 40 based on the gravity center position CG. Specifically, in case C1, the backlight drive unit 13 drives the backlight 40 so as to provide the light emission period PL at the end of the display period Pdisp related to the horizontal line corresponding to the center of gravity position CG1 (FIG. 5). (C)). That is, the backlight 40 emits light at the timing when the pixel Pix related to the center of gravity position CG1 has almost completed the response to the pixel signal, and thus it is possible to reduce the possibility that the observer observes the transient response of the pixel Pix. . As described above, the display device 1 emits the backlight 40 at a timing suitable for display in the moving region Z1, so that the image quality can be improved.

  In this example, the light emission period PL is provided at the last part of the display period Pdisp related to the horizontal line corresponding to the center of gravity position CG1, but the present invention is not limited to this, and the range in which the observer does not feel a decrease in image quality. Thus, it may be slightly shifted from the last part of the display period Pdisp.

  6A and 6B are timing charts of the display operation of the display device 1 in case C2. FIG. 6A shows the operation of the liquid crystal display unit 30, and FIG. 6B shows the light transmission in the pixel Pix of the liquid crystal display unit 30. (C) shows the operation of the backlight 40. 7A and 7B are timing charts of the display operation of the display device 1 in case C3. FIG. 7A shows the operation of the liquid crystal display unit 30, and FIG. 7B shows the light transmission in the pixel Pix of the liquid crystal display unit 30. (C) shows the operation of the backlight 40.

  In case C2, as shown in FIG. 4B, the ball 9 is moving in the region Z2. Therefore, in the horizontal line corresponding to the center-of-gravity position CG2 located in the region Z2, as shown in FIG. 6B, the pixel signal is written in the pixel Pix at the timing t13, and the period (display) of the timing t13 to t14 is displayed. In the period Pdisp), the light transmittance changes in response to the pixel signal. On the other hand, in the regions Z1 and Z3, the light transmittance of the pixel Pix hardly changes. The backlight drive unit 13 drives the backlight 40 so as to provide the light emission period PL at the end of the display period Pdisp related to the horizontal line corresponding to the barycentric position CG2 (FIG. 6C). As described above, in the case C2, the display device 1 causes the backlight 40 to emit light at a timing suitable for display in the moving region Z2, so that the image quality can be improved as in the case C1.

  The same applies to case C3. That is, in the case C3, as shown in FIG. 4C, the ball 9 is moving in the region Z3. Therefore, in the horizontal line corresponding to the center-of-gravity position CG3 located in the region Z3, as shown in FIG. 7B, the pixel signal is written in the pixel Pix at the timing t15, and the period (display) of the timing t15 to t16 is displayed. In the period Pdisp), the light transmittance changes in response to the pixel signal. On the other hand, in the areas Z1 and Z2, the light transmittance of the pixel Pix hardly changes. The backlight drive unit 13 drives the backlight 40 so as to provide the light emission period PL at the end of the display period Pdisp related to the horizontal line corresponding to the barycentric position CG3 (FIG. 7C). As described above, the display device 1 causes the backlight 40 to emit light at a timing suitable for display in the moving region Z3 in the case C3, so that the image quality can be improved as in the case C1.

  In the display device 1, the backlight 40 emits light at a timing suitable for display in a moving region. That is, as shown in FIG. 5B, FIG. 6B, and FIG. 7B, the light transmittance of the pixel Pix is almost constant regardless of the time in a region where there is no movement. No. 1, in these areas, almost the same image can be displayed no matter what timing the backlight 40 is caused to emit light. On the other hand, as described above, in a region where there is movement, it is necessary for the observer 40 to emit the backlight 40 at a timing when the response to the pixel signal is almost completed in order not to observe the transient response of the pixel Pix. is there. In the display device 1, the image quality when displaying a moving image can be improved by causing the backlight 40 to emit light at a timing suitable for display in the region where the motion is present.

  The case where there is a movement only in one of the areas Z1 to Z3 of the display screen S has been described above. Next, a case where there is a movement in a plurality of areas among the areas Z1 to Z3 of the display screen S will be described.

  FIG. 8 shows the operation of the backlight drive unit 13 when the balls 9A and 9B are moving at the same speed in the regions Z1 and Z2, respectively (case C4). FIG. 9 is a timing chart of the display operation of the display device 1 in this case. (A) shows the operation of the liquid crystal display unit 30 and (B) shows the operation of the backlight 40.

  In the case C4, the motion amount N becomes the same value in the regions Z1 and Z2 as shown in FIG. Therefore, the center of gravity position CG4 is a boundary position between the region Z1 and the region Z2. The backlight drive unit 13 drives the backlight 40 so as to provide the light emission period PL at the end of the display period Pdisp related to the horizontal line corresponding to the barycentric position CG4 (FIG. 9B).

  FIG. 10 illustrates the operation of the backlight drive unit 13 when the balls 9A and 9B are moving at different speeds in the regions Z1 and Z2, respectively (case C5). FIG. 11 is a timing chart of the display operation of the display device 1 in this case. (A) shows the operation of the liquid crystal display unit 30 and (B) shows the operation of the backlight 40.

  In the case C5, since the ball 9A is moving at a faster speed than the ball 9B, as shown in FIG. 10, the motion amount N in the region Z1 is larger than the motion amount N in the region Z2. Therefore, the center-of-gravity position CG5 is slightly closer to the area Z1 than the boundary between the area Z1 and the area Z2. The backlight drive unit 13 drives the backlight 40 so as to provide the light emission period PL at the end of the display period Pdisp related to the horizontal line corresponding to the center of gravity position CG5 (FIG. 11B).

  FIG. 12 illustrates the operation of the backlight drive unit 13 when the balls 9A to 9C are moving at the same speed in the regions Z1 to Z3 (case C6), respectively. FIG. 13 is a timing chart of the display operation of the display device 1 in this case. (A) shows the operation of the liquid crystal display unit 30 and (B) shows the operation of the backlight 40.

  In case C6, the motion amount N has the same value in the regions Z1 to Z3 as shown in FIG. Therefore, the center-of-gravity position CG6 is the center position in the line sequential scanning direction of the region Z2. The backlight drive unit 13 drives the backlight 40 so as to provide the light emission period PL at the last part of the display period Pdisp related to the horizontal line corresponding to the barycentric position CG6 (FIG. 13B).

  As described above, the display device 1 causes the backlight 40 to emit light at a timing suitable for display in a region having movement even when there is movement in a plurality of regions among the regions Z1 to Z3 of the display screen S. , Can improve the image quality.

[effect]
As described above, in the present embodiment, since the backlight emission timing is controlled based on the amount of motion of the video to be displayed on the liquid crystal display unit, the backlight is always emitted at a fixed timing. Compared to the above, it is possible to improve the image quality when displaying a moving image.

  In the present embodiment, the liquid crystal display unit is divided into a plurality of areas, and the light emission timing of the backlight is controlled based on the position of the center of gravity of the movement amount. However, since the backlight can be emitted at a timing suitable for display in those areas where there is movement, the image quality can be improved.

[Modification 1-1]
In the above embodiment, the liquid crystal display unit 30 is divided into the three regions Z1 to Z3. However, the present invention is not limited to this. Instead, the liquid crystal display unit 30 may be divided into two regions, or four or more regions. It may be divided into areas. For example, the liquid crystal display unit 30 may be divided into the same number as the number of pixels in the line sequential scanning direction. In this case, each area corresponds to a horizontal line. FIG. 14 illustrates the operation of the backlight drive unit 13B when each region is configured by a horizontal line. First, the backlight drive unit 13B obtains the motion amount N of the video in each horizontal line based on the motion vector signal Sv supplied from the motion vector detection unit 12, and obtains the distribution of the motion amount N (FIG. 14). (Right figure). Then, the backlight drive unit 13B obtains the center of gravity position CG of the motion amount N in the line sequential scanning direction based on the distribution of the motion amount N. And the backlight drive part 13B drives the backlight 40 so that the backlight 40 light-emits at the timing according to the gravity center position CG.

[Modification 1-2]
In the above embodiment, the display is performed at the frame rate (cycle T0) based on the video signal Sdisp. However, the present invention is not limited to this. For example, frame rate conversion may be performed. This example will be described in detail below.

  FIG. 15 illustrates a configuration example of the display device 1C according to the present modification. The display device 1 includes a frame rate conversion unit 19 and a liquid crystal display unit 30C. The frame rate conversion unit 19 generates an interpolated frame image Fi based on two frame images F adjacent to each other in time series, and alternately outputs the frame image F and the interpolated frame image Fi to thereby obtain a frame rate. Is a circuit that converts 2 times. The frame rate conversion unit 19 includes a motion vector detection unit 12C. The motion vector detection unit 12C has the same function as the motion vector detection unit 12 according to the above embodiment. The frame rate conversion unit 19 generates an interpolated frame image Fi from the two frame images F based on the motion vector generated by the motion vector detection unit 12C. The liquid crystal display unit 30C is a liquid crystal display panel that supports so-called double speed driving.

  FIG. 16 shows a timing chart of the display operation in the display device 1 </ b> C. FIG. 16A shows the operation of the liquid crystal display unit 30 </ b> C, and FIG. 16B shows the operation of the backlight 40. This example shows a case where the ball 9 is moving in the area Z1 (case C1, FIG. 4A). In FIG. 16A, for example, “Fi (n)” indicates that the liquid crystal display unit 30 displays the nth interpolation frame image Fi (n).

  In the display device 1C, in the period T0, line sequential scanning related to the frame image F and line sequential scanning related to the interpolated frame image Fi are performed. The cycle T1 of each line sequential scanning is, for example, 8.3 [msec] (= T0 / 2).

  In the liquid crystal display unit 30C, line-sequential scanning is performed in the period from timing t3 to t4, and the frame image F (n) is displayed (FIG. 16A). Thereby, the pixel Pix related to each horizontal line responds to the pixel signal during the display period PdispA from when the pixel signal is written to when it is written next. The backlight drive unit 13 drives the backlight 40 so as to provide the light emission period PL at the end of the display period PdispA related to the horizontal line corresponding to the center of gravity position CG1 related to the case C1 (FIG. 16B).

  Next, in the liquid crystal display unit 30C, line sequential scanning is performed in the period of timing t4 to t5, and the interpolation frame image Fi (n) is displayed (FIG. 16A). The pixel Pix associated with each horizontal line responds to the pixel signal during the display period PdispB from when the pixel signal is written to when it is written next. The backlight drive unit 13 drives the backlight 40 so as to provide the light emission period PL at the end of the display period PdispB related to the horizontal line corresponding to the center of gravity position CG1 related to the case C1 (FIG. 16B).

[Modification 1-3]
In the above embodiment, the backlight 40 emits light on the entire surface of the backlight at the same timing, but is not limited to this, and is configured to have a plurality of partial light emitting units instead. You may comprise so that a partial light emission part may light-emit independently. This will be described in detail below.

  FIG. 17 illustrates a configuration example of the display device 1D according to the present modification. The display device 1D includes a backlight 50 and a backlight driving unit 13D.

  In this example, the backlight 50 includes two partial light emitting units 50A and 50B arranged in parallel in the line sequential scanning direction. These partial light emitting units 50A and 50B are configured to emit light independently. In this example, the liquid crystal display unit 30 is divided into six regions ZA1 to ZA3 and ZB1 to ZB3. The light emitted from the partial light emitting unit 50A enters the corresponding regions ZA1 to ZA3 in the liquid crystal display unit 30, and the light emitted from the partial light emitting unit 50B corresponds to the corresponding region in the liquid crystal display unit 30. It is made incident on ZB1 to ZB3.

  Based on the motion vector signal Sv, the backlight driving unit 13D integrates the magnitude of the motion vector of each pixel in each of the regions ZA1 to ZA3 and ZB1 to ZB3, thereby calculating the motion amount N of the video in each region. After that, the center of gravity CGA of the motion amount N in this region is obtained based on the distribution of the motion amount N in the regions ZA1 to ZA3, and the motion in this region based on the distribution of the motion amount N in the regions ZB1 to ZB3. The center-of-gravity position CGB of the amount N is obtained. Then, the backlight driving unit 13D drives the backlight 50 so that the partial light emitting unit 50A emits light at a timing corresponding to the center of gravity position CGA and the partial light emitting unit 50B emits light at a timing corresponding to the center of gravity position CGB. .

  FIG. 18 shows the operation of the backlight drive unit 13D when the balls 9A and 9B are moving in the areas ZA1 and ZB2, respectively. In this case, the motion amount N is a large value in the areas ZA1 and ZB2. Based on the distribution of the movement amount N, the backlight driving unit 13D obtains the gravity center position CGA of the movement amount N in the areas ZA1 to ZA3 and the gravity center position CGB of the movement amount N in the areas ZB1 to ZB3.

  FIG. 19 shows a timing chart of the display operation of the display device 1D in the case shown in FIG. 18, (A) shows the operation of the liquid crystal display unit 30, and (B), (C) show the backlight. The operations of the 50 partial light emitting units 50A and 50B are respectively shown. For the partial light emitting unit 50A, the backlight driving unit 13D provides a light emission period PL at the end of the display period Pdisp related to the horizontal line corresponding to the gravity center position CGA (FIG. 19B), and the partial light emitting unit 50B. In contrast, the backlight 50 is driven so that the light emission period PL is provided at the end of the display period Pdisp related to the horizontal line corresponding to the gravity center position CGB (FIG. 19C).

  In this example, the backlight 50 is configured to include the two partial light emitting units 50A and 50B. However, the configuration is not limited thereto, and instead, the backlight 50 includes three or more partial light emitting units. You may comprise as follows.

[Modification 1-4]
In the above embodiment, the backlight drive unit 13 controls the light emission timing of the backlight 40 based on the center of gravity position CG of the movement amount N of each of the regions Z1 to Z3. However, the present invention is not limited to this. Instead of this, for example, the light emission timing of the backlight 40 may be controlled based on the region of the regions Z1 to Z3 where the motion amount N is maximum. Specifically, for example, when the amount of motion N in the region Z1 is maximized, the light emission timing can be controlled in the same manner as in the above embodiment based on the center position of the region Z1 in the line sequential scanning direction. it can. Further, if the amount of motion N is maximized in a plurality of areas, the light emission timing may be controlled in the same manner as in the above embodiment based on the barycentric positions of the plurality of areas.

<2. Second Embodiment>
Next, the display device 2 according to the second embodiment will be described. In the present embodiment, correction is performed so as to increase the amount of motion N in a region of the regions Z1 to Z3 that is likely to be noticed by the observer. In addition, the same code | symbol is attached | subjected to the component substantially the same as the display apparatus 1 which concerns on the said 1st Embodiment, and description is abbreviate | omitted suitably.

  As shown in FIG. 1, the display device 2 includes a backlight driving unit 63. Similarly to the backlight drive unit 13 according to the first embodiment, the backlight drive unit 63 obtains the motion amount N of the video in each of the regions Z1 to Z3 based on the motion vector signal Sv, and then Based on the distribution of the motion amount N in the areas Z1 to Z3, the center of gravity position CG of the motion amount N is obtained, and the backlight 40 is driven so that the backlight 40 emits light at a timing according to the center of gravity position CG. At that time, the backlight driving unit 63 corrects the movement amount N in the region Z2 located in the center of the display screen S among the regions Z1 to Z3 so as to increase.

  FIG. 20 illustrates an operation example of the backlight drive unit 63. In this example, the image displayed on the display screen S is a photograph of a landscape from a moving train. In this example, distant mountains move slowly in the areas Z1 and Z2, and nearby trees move quickly in the area Z3.

  The backlight drive unit 63 corrects the motion amount N in the region Z2 to a larger value (10 times in this example) among the motion amounts N in the regions Z1 to Z3 (right diagram in FIG. 20). Then, the backlight drive unit 63 obtains the center of gravity position CG based on the corrected distribution of the motion amount N. Then, similarly to the case of the first embodiment, the backlight driving unit 63 provides the light emission period PL at the last part of the display period Pdisp related to the horizontal line corresponding to the center of gravity position CG. Drive. That is, the display device 2 causes the backlight 40 to emit light at a timing suitable for display at the center of gravity position CG (region Z2).

  In general, it is considered that the observer is more likely to pay attention to the central portion of the display screen S than the edge of the display screen S. Therefore, in the display device 2, the backlight drive unit 63 corrects the amount of motion N in the region Z2 located in the center of the display screen S to a large value. Thereby, the gravity center position CG can be brought close to the center of the display screen S where the observer is likely to pay attention.

  In the example of FIG. 20, if such correction is not performed, the gravity center position CGR is located in the region Z3. In other words, in this example, the trees move fast in the region Z3, so that the center-of-gravity position CGR is located in the region Z3 where the trees are displayed. Therefore, in this case, the display device causes the backlight 40 to emit light at a timing suitable for display at the gravity center position CGR (region Z3). However, in this example, since it is considered that the observer is likely to pay attention to the mountain displayed in the central portion of the display screen S, the display device displays in the areas Z1 to Z2 where the mountain is displayed. It is desirable to emit the backlight 40 at an appropriate timing.

  In the display device 2, the backlight drive unit 63 corrects the amount of motion N in the region Z <b> 2 located at the center of the display screen S, which is likely to be noticed by the observer, to a large value as illustrated in FIG. 20. To do. Thereby, in the display apparatus 2, the gravity center position CG can be brought close to the center of the display screen S where the observer is likely to pay attention, and the image quality when displaying a moving image can be improved.

  As described above, in the present embodiment, the motion amount in the region Z2 is corrected to a large value, so that the image quality when displaying a moving image can be improved. Other effects are the same as in the case of the first embodiment.

[Modification 2-1]
In the above embodiment, the motion amount N in the region Z2 located in the center of the display screen S is corrected to a large value, but the present invention is not limited to this, and instead, for example, other regions Z1, The motion amount N in Z3 may be corrected to a small value.

[Modification 2-2]
In the above embodiment, the region for correcting the motion amount N is fixed to the region Z2, but the present invention is not limited to this, and the region for correcting the motion amount N may be dynamically changed. Hereinafter, an example of this case will be described in detail.

  FIG. 21 illustrates a configuration example of the display device 2B according to the present modification. The display device 2B includes a control unit 61, a face detection unit 64, and a backlight drive unit 63B. The control unit 61 is a circuit that controls the display drive unit 20, the motion vector detection unit 12, the face detection unit 64, and the backlight drive unit 63 to operate in synchronization with each other based on the video signal Sdisp. Specifically, the control unit 61 supplies the video signal Sdisp and the face detection control signal to the face detection unit 64. The face detection unit 64 detects the face of a person to be displayed on the display screen S based on the video signal Sdisp, obtains the position and size of the face on the display screen S, and the like (face detection information IF). ) Is supplied to the backlight drive unit 63B. In addition to the function of the backlight drive unit 63, the backlight drive unit 63B further has a function of selecting a region for correcting the motion amount N from the regions Z1 to Z3 based on the face detection information IF. Yes.

  FIG. 22 illustrates an operation example of the backlight driving unit 63B. In this example, the video displayed on the display screen S is taken while changing the shooting direction of the video camera. In this example, a cloud, a tree, and a person (face) are moving in the areas Z1 to Z3, respectively. That is, in this example, the moving speeds of clouds, trees, and people (faces) in the display screen S are substantially the same.

  The face detection unit 64 detects a face to be displayed on the display screen S, and supplies the face detection information IF to the backlight drive unit 63B. Based on the face detection information IF, the backlight drive unit 63B specifies a region where a face is displayed (region Z1 in this example). Then, the backlight drive unit 63B corrects the motion amount N of the region (region Z1) where the face is displayed to a larger value (10 times in this example) (right diagram in FIG. 22), and the corrected motion amount Based on the distribution of N, the center of gravity position CG is obtained.

  In general, when a person (face) is displayed on the display screen S, the observer is likely to pay attention to the face. Therefore, in the display device 2B, the backlight drive unit 63B corrects the amount of motion N in the region where the face is to be displayed (the region Z3 in this example) to a large value. Thereby, the center of gravity position CG can be brought closer to the area Z3 where the face is to be displayed than the center of gravity position CGR in the case where such correction is not performed, and the backlight 40 is turned on at a timing more suitable for display in the area Z3. By emitting light, image quality can be improved.

  In this example, the face of a person is detected. However, the present invention is not limited to this, and any object may be detected as long as there is a high possibility that the observer will pay attention. .

[Modification 2-3]
Modifications 1-1 to 1-4 of the first embodiment may be applied to the display device 1 according to the embodiment.

  The present technology has been described above with some embodiments and modifications. However, the present technology is not limited to these embodiments and the like, and various modifications are possible.

  For example, in each of the above-described embodiments, the backlight driving units 13 and 63 obtain the gravity center position CG of the motion amount N in the line sequential scanning direction, and the backlight 40 emits light at a timing according to the gravity center position CG. As described above, the backlight 40 is driven. However, the present invention is not limited to this. For example, the backlight 40 may be driven so that the timing at which the backlight 40 emits light gradually changes. . Specifically, for example, an IIR (Infinite impulse response) filter is provided, and the obtained center-of-gravity position CG is input to the IIR filter, and the backlight 40 emits light at a timing according to the output (center-of-gravity position CGF). can do. FIG. 23 shows the movement of the center-of-gravity position CGF in the display device 1F according to this modification. In this example, the movement of the gravity center position CGF when the position of the ball 9 on the display screen S changes from the case C1 (FIG. 4A) to the case C2 (FIG. 4B) at the timing t9. Show. As shown in FIG. 23, the gravity center position CGF gradually changes from the gravity center position CG1 in the case C1 to the gravity center position CG2 in the case C2 with a time constant τ. As a result, the light emission timing of the backlight 40 is gradually changed with the time constant τ without changing rapidly at the timing t9. Thereby, in the display apparatus 1F, since the light emission timing of the backlight 40 does not change abruptly, it is possible to reduce the possibility that the observer feels the display image unnaturally.

  For example, in each of the above-described embodiments, the liquid crystal display unit 30 and the backlight 40 are used. However, the present invention is not limited to this, and instead, for example, a CRT (Cathode Ray Tube) display device, EL (Electro Luminescence) A display device or an LED display device using an LED as a display element may be used. As an example, a case where an EL display unit is used in place of the liquid crystal display unit 30 and the backlight 40 in the first embodiment will be described below.

  FIG. 24 illustrates a configuration example of the display device 1G according to the present modification. The display device 1G includes a display control unit 13G, a display driving unit 20G, and an EL display unit 30G. The display control unit 13G obtains the motion amount N in the regions Z1 to Z3 based on the motion vector signal Sv, obtains the center of gravity position CG of the motion amount N in the line sequential scanning direction, and displays the center of gravity according to the center of gravity position CG. The drive unit 20G is controlled. The display drive unit 20G drives the EL display unit 30G based on the video signal Sdisp supplied from the control unit 11 and the control signal supplied from the display control unit 13G. Specifically, the display drive unit 20G drives the EL display unit 30G so that the EL display unit 30G emits light at an optimal timing for display on the horizontal line related to the barycentric position CG. The EL display unit 30G is configured by an EL display element, and for example, an organic EL element is applicable.

  In addition, this technique can be set as the following structures.

(1) a display unit that is controlled so that display light is intermittently emitted from the display screen;
And a control unit that controls a display light timing at which the display light is emitted based on a motion amount of an image to be displayed on the display unit.

(2) The display section is divided into a plurality of partial display areas in the line sequential scanning direction,
The display device according to (1), wherein the control unit controls the display light timing based on a motion amount of a video in each partial display region.

(3) The control unit obtains the barycentric position of the motion amount in the line-sequential scanning direction based on the video motion amount of each partial display area, and controls the display light timing based on the barycentric position. ) Display device.

(4) The display device according to (3), wherein the control unit sets the display light timing at or near the end of a display period in which a horizontal line corresponding to the barycentric position is displayed.

(5) The control unit specifies a partial display region having the largest motion amount of the video among the plurality of partial display regions, and controls the display light timing based on the specified partial display region. The display device according to (2).

(6) The display device according to (5), wherein the control unit sets the display light timing at or near the end of a display period in which a horizontal line corresponding to the specified partial display area is displayed. .

(7) The display device according to any one of (2) to (6), wherein the control unit corrects the movement amount in a predetermined partial display area among the plurality of partial display areas.

(8) The display device according to (7), wherein the predetermined partial display region is located near a center of a display screen.

(9) An image identification unit for identifying a predetermined image in an image to be displayed is provided,
The display device according to (7), wherein the predetermined partial display area is a partial display area in which the predetermined image is identified.

(10) The display device according to (9), wherein the predetermined image is a face image.

(11) The display device according to any one of (2) to (10), wherein the partial display region is a region including a plurality of horizontal lines.

(12) The display device according to any one of (2) to (10), wherein the partial display region is a region including a single horizontal line.

(13) The display device according to any one of (1) to (12), wherein the control unit controls the display light timing to gradually change over a plurality of frame periods.

(14) The display device according to any one of (1) to (13), wherein the display unit includes a liquid crystal display unit and a backlight.

(15) The backlight has a plurality of partial light emitting units,
The liquid crystal display unit is divided into a plurality of partial display regions in a region corresponding to each partial light emitting unit,
The display device according to (14), wherein the control unit controls the light emission timing for each partial light emitting unit based on a motion amount of a video in each of a plurality of corresponding partial display areas.

(16) The display device according to any one of (1) to (13), wherein the display unit is an electroluminescence display unit.

(17) A display method in which the amount of motion of a video to be displayed on the display unit is detected, and based on the amount of motion, the timing of display light intermittently emitted from the display screen is controlled to perform video display.

  DESCRIPTION OF SYMBOLS 1,1C, 1D, 1F, 1G, 2,2B ... Display apparatus, 9, 9A-9C ... Ball, 11 ... Control part, 12, 12C ... Motion vector detection part, 13, 13D, 63, 63B ... Backlight drive , 13G ... display control unit, 64 ... face detection unit, 19 ... frame rate conversion unit, 20, 20G ... display drive unit, 21 ... timing control unit, 22 ... gate driver, 23 ... data driver, 30, 30C ... liquid crystal Display unit, 30G ... EL display unit, 40, 50 ... Backlight, 50A, 50B ... Partial light emitting unit, CG, CG1 to CG6, CGA, CGB ... Center of gravity position, Cs ... Retention capacitance element, CSL ... Retention capacitance line, GCL ... Gate line, IF ... Face detection information, LC ... Liquid crystal element, N ... Motion amount, Pdisp ... Display period, Pix ... Pixel, PL ... Light emission period, S ... Display screen, Sdisp, Sdisp2 ... Video signal, SGL Data lines, Sv ... motion vector signal, Tr ... TFT element, T0, T1 ... period, Z1~Z3, ZA1~ZA3, ZB1~ZB3 ... area.

Claims (17)

A display unit that is controlled so that display light is intermittently emitted from the display screen;
And a control unit that controls a display light timing at which the display light is emitted based on a motion amount of an image to be displayed on the display unit. The display section is divided into a plurality of partial display areas in the line sequential scanning direction,
The display device according to claim 1, wherein the control unit controls the display light timing based on a motion amount of a video in each partial display region. The control unit according to claim 2, wherein the control unit obtains a center of gravity position of the motion amount in the line-sequential scanning direction based on the motion amount of the video in each partial display area, and controls the display light timing based on the center of gravity position. Display device. The display device according to claim 3, wherein the control unit sets the display light timing at or near the end of a display period in which a horizontal line corresponding to the barycentric position is displayed. The control unit identifies a partial display region having the largest motion amount of the video among the plurality of partial display regions, and controls the display light timing based on the identified partial display region. The display device described in 1. The display device according to claim 5, wherein the control unit sets the display light timing at or near the end of a display period in which a horizontal line corresponding to the specified partial display region is displayed. The display device according to claim 2, wherein the control unit corrects the movement amount in a predetermined partial display area among the plurality of partial display areas to be increased. The display device according to claim 7, wherein the predetermined partial display area is located near a center of a display screen. An image identification unit for identifying a predetermined image in an image to be displayed;
The display device according to claim 7, wherein the predetermined partial display area is a partial display area in which the predetermined image is identified. The display device according to claim 9, wherein the predetermined image is a face image. The display device according to claim 2, wherein the partial display region is a region including a plurality of horizontal lines. The display device according to claim 2, wherein the partial display region is a region formed of one horizontal line. The display device according to claim 1, wherein the control unit controls the display light timing to gradually change over a plurality of frame periods. The display device according to claim 1, wherein the display unit includes a liquid crystal display unit and a backlight. The backlight has a plurality of partial light emitting portions,
The liquid crystal display unit is divided into a plurality of partial display regions in a region corresponding to each partial light emitting unit,
The display device according to claim 14, wherein the control unit controls a light emission timing for each of the partial light emitting units based on a motion amount of a video in each of a plurality of corresponding partial display areas. The display device according to claim 1, wherein the display unit is an electroluminescence display unit. A display method in which an amount of motion of a video to be displayed on a display unit is detected, and based on the amount of motion, the timing of display light emitted intermittently from a display screen is controlled to display a video.

Images