JP2009211006A - Tile type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce blurring in dynamic image display while suppressing a peak power consumption in a tile type display device adapting an active matrix drive system and using an organic EL element. <P>SOLUTION: A plurality of display parts 101 is grouped and controlled for each group without inserting black frames to the plurality of display parts 101 at the same time. For example, display parts of the 4×4 tile type display device 200 shown in Fig.2 are alternately classified into different groups, and controlled so that one group is the black frame in a certain frame, and the other group is the black frame in the following frame. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a tile type display device configured by a plurality of display units.

  Each display unit of a tile-type display device (hereinafter referred to as “tile-type display device”) configured by a plurality of conventional display units is configured by an LED or a CRT, and an image is displayed when a moving image is displayed. There was no blurring. However, the size of one pixel is limited to several inches for a CRT and several mm for an LED, and a high-definition display cannot be realized. Patent Document 1 discloses an example of a tiled display device.

  In order to achieve higher definition, a display unit composed of organic EL elements is used. There are an active matrix driving method and a passive matrix driving method as a driving method of a display unit using an organic EL element, but a tile display device is often realized as a large display of about several hundred inches, which is more than a passive matrix driving method. If an active matrix driving method with low power consumption is employed, low power consumption can be achieved.

  Patent Documents 2 and 3 disclose an example of an active matrix drive display device.

JP 2004-46186 A JP 2007-114286 A JP 2006-330140 A

  However, when an active matrix driving method is employed and a moving image is displayed on a tile type driving device configured with a display unit using an organic EL element, there is a problem that blurring occurs. In a display unit using an LED or CRT, an impulse-type display (one that is recognized as an image by the afterimage effect of the human eye with a short pixel lighting time) is displayed, and blur is felt when a moving image is displayed. It never happened. When the active matrix driving method is employed using an organic EL element, an image displayed in one frame constituting a moving image does not always emit light and disappear during that frame. Therefore, when the observer of the tile display device recognizes a moving image in the displayed image, the observer's line of sight moves continuously in the moving direction of the moving image portion, but the moving image itself is discrete for each frame. Therefore, there is a difference between the actual display and the observer's line of sight, which is perceived as blur (hereinafter referred to as “hold blur”).

  As a countermeasure against hold blur, a method of inserting a “black frame” that is a period during which nothing is displayed is known between frames. For example, in Patent Document 2, when driving a display panel having a configuration in which a plurality of display pixels are two-dimensionally arranged, a black frame is sequentially inserted for each line. In Patent Document 3, a plurality of lines are grouped into one group. It is described that black frames are sequentially inserted for each group. When a black frame is inserted, the operation is similar to that of the impulse type, and blur can be reduced.

  However, when a black frame is inserted, the time allotted to an image to be displayed is reduced. Therefore, in order to obtain the same luminance as when no insertion is performed, the voltage applied to the organic EL element is increased in a frame other than the black frame. It is necessary and power consumption increases. If the power consumption fluctuates greatly from frame to frame, a new problem arises that the display device needs a power supply system corresponding to the frame in which the power consumption peaks.

  The present invention has been made in view of such problems, and an object of the present invention is to display a moving image while suppressing peak power consumption in a tiled display device using an organic EL element by employing an active matrix driving method. It is to reduce the blur of time.

  In order to achieve such an object, the invention described in claim 1 is a tiled display device using an active matrix driving system, and includes a plurality of display units configured by organic EL elements, and the plurality of display units. The display unit is classified into a plurality of groups, and black frames are inserted in units of the plurality of groups.

  In addition, the invention according to claim 2 further includes a control unit according to claim 1, and information on classified groups is preset in each of the plurality of display units, and the insertion of the black frame is performed The timing is controlled by comparing a frame control signal input from the control unit to each of the plurality of display units and information on a group set in advance in each of the plurality of display units. Features.

  According to a third aspect of the present invention, in the second aspect, each of the plurality of display units includes a tile display unit on which an image is displayed and a display control unit, and the display control unit includes the frame. A comparator for comparing the control signal with the information of the preset group, and a first storage means for storing image data to be displayed and black data based on the output of the comparator. A selector that selects any one of the second storage means and outputs data to the tile display unit is provided.

  According to a fourth aspect of the present invention, in the first or second aspect, the control unit detects whether or not a moving image is included in an image displayed on each of the plurality of display units. A moving image mode signal is generated for each of the display units, and each of the plurality of display units inserts a black frame only when a moving image is included based on the moving image mode signal. To do.

  According to a fifth aspect of the present invention, in the fourth aspect, each of the plurality of display units includes a tile display unit on which an image is displayed and a display control unit, and the display control unit includes the frame. A comparator for comparing the control signal with the information of the preset group, and a first storage means for storing image data to be displayed and black data based on the output of the comparator. The moving image comprising: a selector that selects any one of the second storage means and outputs data to the tile display unit; and a multiplier disposed between the first storage means and the selector. The mode signal is input to the selector and the multiplier, and when the moving image is not included, the selector always selects the first storage unit, and when the moving image is included, the selector Comparator And selects either one of said first memory means and said second storage means based on the forces.

  According to the present invention, a plurality of display units constituting a tiled display device are classified into a plurality of groups, and black frames are inserted in units of these groups, thereby suppressing peak power consumption and displaying a moving image. The blur can be reduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 shows a tiled display device according to the first embodiment. The tiled display device 100 includes a plurality of display units 101 arranged in a tiled manner. A display control signal and a frame control signal are input to each display unit 101 from the control unit 102. FIG. 2 is a front view of a 4 × 4 tile display device.

  FIG. 3 shows the configuration of each display unit in detail. The display unit 101 includes a tile display unit 301 and a tile display control unit 310. The tile display control unit 310 includes an embedded control unit 320 to which a display control signal from the control unit 102 illustrated in FIG. 1 is input via the display control signal interface unit 321 and a frame control signal to which a frame control signal is input. The interface unit 311, the embedded control unit 320, the frame control signal interface unit 311 and the display control unit 312 connected to the tile display unit 301, and the display memory 313 connected to the display control unit 312 are provided. The embedded control unit 320 further includes a RAM 322, an MPU 323, a flash memory 324, and the like.

  The display control signal includes a selection signal for the tile display control unit 310, a control signal for controlling the tile display control unit 310, and image data displayed on the tile display unit 301, and this image data is sent to the display memory 313. The display control unit 312 sends the image data stored in the display memory 313 to the tile display unit 301 based on the frame control signal input via the frame control signal interface unit 311. The frame control signal includes a black frame insertion timing and a selection signal from the display control unit 312 in addition to the image data display timing, and black frames are inserted based on the frame control signal as necessary.

  In the present invention, instead of inserting black frames into the plurality of display units 101 at the same timing, the plurality of display units 101 are grouped and controlled for each group. For example, the display units of the 4 × 4 tile display device 200 shown in FIG. 2 are alternately classified into another group, one group being a black frame in one frame and the other group being a black frame in the next frame. Control in the form of This is shown in FIGS. 4 (a) and 4 (b). FIG. 4B shows the state of the next frame in FIG. The blur at the time of moving image display can be reduced by inserting a black frame, and the power consumption can be suppressed from fluctuating for each frame by grouping a plurality of display units and controlling each group. When a black frame is inserted at the same timing, the power consumption for each frame varies greatly, and the peak power consumption increases.

  Note that although a specific example of the configuration of the display unit 101 is illustrated in FIG. 3, it is not intended to be limited to the illustrated form as long as it has an equivalent function.

  Also, the two groups shown in FIG. 4 are examples, and can be grouped into three or more groups.

EXAMPLE Consider the case where a circle 501 is displayed on a 4 × 4 tile display 200 as shown in FIG. A circle 501 is a moving image and is assumed to move to the right side of the screen as shown in FIG. Here, t indicates the time of one frame. In this embodiment, the grouping described with reference to FIG. 4 is used, and the group into which the black frame is inserted is switched every t / 2 obtained by dividing one frame into two. FIG. 7 shows this process, and FIG. 8 shows the relationship between power consumption and time. Since the number of inserted black frames is always constant, the power consumption of the tiled display device 200 is averaged over time.

  In this embodiment, the power consumption is constant because the number of display units constituting each group is equal, but the black frame insertion timing is set in units of groups even in the grouping where the number of display units is different. Note that peak power consumption can be reduced by shifting.

  As a reference example, when a black frame is inserted at the same timing as shown in FIG. 9, the power consumption greatly varies from frame to frame as shown in FIG. In this reference example, the peak power consumption is twice that of the embodiment.

  Specifically, the grouping can be performed as follows. First, as shown in FIG. 11, an address is provided for each of the display units 101 constituting the tile display device 200. Then, for example, as shown in FIGS. 12A and 12B, addresses are allocated to two groups. Which group each display unit 101 belongs to is set in advance in the tile display control unit 310 of the display unit 101. As a setting method, for example, a setting method using a dedicated switch (not shown) provided in the built-in control unit 320, or group setting information is stored in the flash memory 324 via a display control signal from the control unit 102. A method of storing is conceivable.

  FIG. 13 shows the display control unit. The group setting information is read by the MPU 323 before the display starts and set in the comparison register 1301 in the display control unit 312. The comparator 1302 compares the frame control signal input via the frame control signal interface unit 311 with the group setting information set in the comparison register 1301, and the selector 1303 is controlled based on the comparison. The selector 1303 receives inputs of a display memory 313 and a memory 1304 that stores black data used in a black frame. The black data may be preset by the MPU 323 or may be created by hardware. When black data is set by the MPU 323, the MPU 323 sets black data before this operation starts. In addition, the case where it is created by hardware means that a circuit corresponding to black data is prepared in a circuit, and a procedure such as writing by the MPU 323 is unnecessary.

  When the output from the comparator 1302 indicates that the period corresponds to the black frame, black data is selected and the output from the memory 1304 is sent to the tile display unit 301. On the contrary, when it is indicated that the time corresponds to the display, the output from the display memory 313 is sent to the tile display unit 301.

(Embodiment 2)
FIG. 14 shows a tiled display device according to the second embodiment. The tiled display device 1400 includes a plurality of display units 1401 arranged in a tiled manner, and a display control signal and a frame control signal are input to each display unit 1401 from the control unit 1402. In addition, the display control unit 1402 inputs a separate moving image mode signal to each display unit 1401. Image data is input to the control unit 1402 from the hard disk drive 1403 or the network 1404.

  In this embodiment, the control unit 1402 detects a moving image for each display unit 1401 from the input image data, and the display unit 1401 including the moving image portion inserts a black frame, thereby displaying no moving image. In 1401, no insertion is performed. For example, when black frames are inserted into all the display units 1401 as in the example of the first embodiment, when grouped into two groups having the same length, the luminance is reduced by half, and the luminance of the display frame is set to 2 higher than usual. Need to double. When the instantaneous luminance is increased, the current flowing through the organic EL element is increased and the life is decreased (change in the device over time, specifically, luminance deterioration). For this reason, it is preferable to extend the lifetime so as not to use a black frame in a still image as much as possible.

  As a technique for detecting a moving image from image data, a number of techniques such as those used in the MPEG2 system are well known and commonly used, and any of them can be applied to the invention according to this embodiment. Good.

Embodiment FIG. 15 shows a process in which a moving image is detected by the control unit 1402 and display is controlled by the display unit 1401 based on a moving image mode signal. The hatched portion in the figure is a display portion where no moving image is displayed. Since this part is a still image, it is not a black frame. FIG. 16 shows an example of display control performed based on the moving image mode signal and the frame control signal. “0” and “1” represent frame control signals for the “0” group and “1” group shown in FIG. 12, respectively.

  FIG. 17 shows the display control unit. This is similar to the display control unit shown in FIG. 13 except that a multiplier is provided between the display memory 313 and the selector 1703, and the multiplier 1705 and the video mode signal interface 1710 are used. The difference is that a moving image mode signal is input to the selector 1703.

  When the moving image mode signal is L (still image), even when the output from the comparator 1702 to the selector 1703 indicates a period corresponding to the black frame, the output of the display memory 313 remains unchanged. It is sent to the tile display unit 301. When the moving image mode signal is H (moving image), black data is selected and tile display is performed from the memory 1704 when the output from the comparator 1702 to the selector 1703 indicates a period corresponding to the black frame. Data is sent to the unit 301. When it is shown that the time corresponds to the display, the output from the display memory 313 is doubled by the multiplier 1705 and sent to the tile display unit 301. Since the display time is halved by the insertion of the black frame, the same luminance as that of the still image portion can be obtained by doubling with a multiplier. In other words, the multiplier 1705 doubles the output of the display memory 313 so that the luminance of the moving image portion becomes equal to the luminance of the still image portion.

It is a figure which shows the tile type display apparatus which concerns on Embodiment 1. FIG. It is a front view of a 4x4 tile type display apparatus. It is a figure which shows the detail of a structure of the display part with which a tile type display apparatus is provided. It is a figure which shows an example of grouping of a display part. It is a figure for demonstrating the movement of the circle | round | yen of the Example of Embodiment 1. FIG. It is a figure for demonstrating the movement of the circle | round | yen of the Example of Embodiment 1. FIG. It is a figure for demonstrating insertion of the black frame in an Example. It is a figure which shows the relationship between the power consumption and time in an Example. It is a figure for demonstrating insertion of the black frame in a reference example. It is a figure which shows the relationship between the power consumption and time in a reference example. It is a figure for demonstrating a grouping concretely. It is a figure for demonstrating a grouping concretely. It is a figure which shows the Example of a display control part. It is a figure which shows the tile type display apparatus which concerns on Embodiment 2. FIG. FIG. 10 is a diagram for explaining insertion of a black frame in an example of the second embodiment. It is a figure for demonstrating the control of the display performed based on a moving image mode signal and a frame control signal. It is a figure which shows the Example of a display control part.

Explanation of symbols

100, 1400 Tile display device 101, 1401 Display unit 102, 1402 Control unit 301 Tile display unit 312 Display control unit 313 Display memory (corresponding to first storage means)
1301, 1701 Comparison register 1302, 1702 Comparator 1303, 1703 Selector 1304, 1704 Memory (corresponding to second storage means)
1705 multiplier

Claims (5)

A tiled display device using an active matrix driving method,
Provided with a plurality of display units composed of organic EL elements,
The plurality of display units are classified into a plurality of groups,
A tiled display device, wherein a black frame is inserted in units of each of the plurality of groups. A control unit;
In each of the plurality of display units, information of the classified group is preset,
The insertion of the black frame is performed at a timing by comparing a frame control signal input from the control unit to each of the plurality of display units and information on a group set in advance in each of the plurality of display units. The tiled display device according to claim 1, wherein the tiled display device is controlled. Each of the plurality of display units includes a tile display unit on which an image is displayed, and a display control unit, and the display control unit includes:
A comparator for comparing the frame control signal with the preset group information;
Based on the output of the comparator, the first display unit storing the image data to be displayed and the second storage unit storing the black data are selected, and the tile display unit receives the data. The tile-type display device according to claim 2, further comprising: a selector that outputs a signal. The control unit detects whether or not a moving image is included in an image displayed on each of the plurality of display units, and generates a moving image mode signal for each of the plurality of display units;
3. The tile display device according to claim 1, wherein each of the plurality of display units inserts a black frame only when a moving image is included based on the moving image mode signal. Each of the plurality of display units includes a tile display unit on which an image is displayed, and a display control unit, and the display control unit includes:
A comparator for comparing the frame control signal with the preset group information;
Based on the output of the comparator, the first display unit storing the image data to be displayed and the second storage unit storing the black data are selected, and the tile display unit receives the data. A selector that outputs
A multiplier disposed between the first storage means and the selector;
The moving image mode signal is input to the selector and the multiplier,
When no moving image is included, the selector always selects the first storage means,
The said selector selects either the said 1st memory | storage means and the said 2nd memory | storage means based on the output of the said comparator, when a moving image is contained. Tile display device.

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