JP2005321424A - Image display device - Google Patents

Image display device Download PDF

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Publication number
JP2005321424A
JP2005321424A JP2004136965A JP2004136965A JP2005321424A JP 2005321424 A JP2005321424 A JP 2005321424A JP 2004136965 A JP2004136965 A JP 2004136965A JP 2004136965 A JP2004136965 A JP 2004136965A JP 2005321424 A JP2005321424 A JP 2005321424A
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JP
Japan
Prior art keywords
video signal
input video
light source
display
luminance
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Granted
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JP2004136965A
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Japanese (ja)
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JP5139623B2 (en
Inventor
Takashi Yoshii
隆司 吉井
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Sharp Corp
シャープ株式会社
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Priority to JP2004136965A priority Critical patent/JP5139623B2/en
Publication of JP2005321424A publication Critical patent/JP2005321424A/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406Control of illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • G09G2320/0653Controlling or limiting the speed of brightness adjustment of the illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/16Calculation or use of calculated indices related to luminance levels in display data

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device preventing degradation in a display grade due to a fluctuation in the luminance of an OSD display even when an improvement in sharpness and a reduction of electric power consumption are realized by dynamically optimizing screen luminance according to an input video signal. <P>SOLUTION: The image display device comprises: a liquid crystal panel 3 for displaying the input video signal by using a back light source 9; an APL detector 6 for detecting the average luminance level of the input video signal; a control microcomputer 18 for dynamically and variably controlling the light emission luminance of the back light source 9; and an OSD section 11 for superposing (compositing) a prescribed on-screen display image signal on the input video signal. The control microcomputer 18 maintains the light emission luminance of the back light source 9 approximately constant regardless of the average luminance level of the input video signal when displaying the prescribed on-screen display image signal in superposition thereof on the input video signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image display apparatus that displays an image by illuminating a light-receiving light modulation means with a backlight light source, and more specifically, an image that dynamically modulates the luminance of a backlight light source in accordance with an input video signal. The present invention relates to a display device.

  In recent years, instead of a cold cathode fluorescent lamp (CRT), a device that displays an image using a liquid crystal panel as a light receiving type light modulating means (hereinafter referred to as a liquid crystal display device) has been used for image display of a television receiver, a computer device or the like. It has come to be widely used. The liquid crystal display device controls the group and orientation of liquid crystal molecules by encapsulating liquid crystal between two transparent substrates provided with electrodes and controlling the voltage to drive electrode units arranged in a matrix. An image is displayed on the liquid crystal panel by changing the transmittance of the irradiation light from the backlight light source provided on the back surface of the transparent substrate.

  Basically, the luminance level of the light source is fixedly set to the content that the user manually adjusts (dimming), and has a constant luminance regardless of the input video signal. However, in recent years, there has been a method of dynamically adjusting the brightness of a light source in accordance with an input video signal that changes from time to time (in units of one field) in order to make a display image easier to see or reduce power consumption. Various proposals have been made.

  For example, in Japanese Patent Application Laid-Open No. 8-201812 (Patent Document 1) and WO 03/38799 (Patent Document 2), an average luminance level (APL) of an input video signal is detected, and the detected average luminance level is large. By reducing the brightness of the light source sometimes and increasing the light source brightness when it is low, even with the same image gradation display, the screen brightness can be made different to enable a sharp (enhanced dynamic contrast) video display Has been proposed.

  In general, in this type of image display device, various information such as a setting menu screen prepared in advance, a current time, a setting mode such as a channel selection channel, and character characters according to the operation mode are superimposed on the input video signal. By performing (synthesizing) and OSD (on-screen display) display, it is possible to realize a user interface function and to notify various information to the user.

  Here, a conventional liquid crystal display device capable of dynamically modulating the luminance of the backlight light source in accordance with the feature amount of the input video signal will be described with reference to FIGS. As shown in FIG. 3, the conventional liquid crystal display device reads out a predetermined on-screen display image signal from a character generator (memory) (not shown), superimposes (synthesizes) it on an input video signal, and outputs it, A liquid crystal that outputs a liquid crystal drive signal to the gate driver 4 and the source driver 5 of the liquid crystal panel (light receiving type light modulation means) 3 based on the display video signal on which the on-screen display image signal is superimposed (synthesized) by the OSD unit 1. And a controller 2.

  An APL detection unit 6 that detects an average luminance level (within one screen) of an input video signal; a remote control light receiving unit 7 that receives an instruction signal input by a user using a remote controller (remote controller) (not shown); The instruction signal received by the remote control light receiving unit 7 is detected and analyzed, and the OSD unit 1 is controlled to superimpose (synthesize) a predetermined on-screen display image signal on the input video signal, and the APL detection unit 6 performs the control. And a control microcomputer 8 for controlling the light source driving unit 10 such as an inverter circuit for driving the backlight light source 9 based on the detected average luminance level.

The control microcomputer 8 refers to a look-up table using a built-in ROM (not shown), or performs an operation using an approximate function, or the driving voltage value (or current) of the backlight light source 9 with respect to the average luminance level of the input video signal. By adaptively changing the value), the screen luminance (brightness) characteristics as shown in FIG. 4 can be realized.
JP-A-8-201812 WO03 / 38799 gazette

  The screen brightness (brightness) of the liquid crystal display device is determined by the product of the transmittance of the liquid crystal panel 3 and the light emission brightness (light quantity) of the backlight light source 9. That is, by dynamically changing the light emission luminance of the light source 9, that is, the screen luminance in accordance with the content of the video to be displayed, the result is that the quality of the moving image is sharpened, and high image quality can be realized. As shown in FIG. 5, when OSD display is performed, the brightness (brightness) of the OSD display that should be stable independently of the display video content also changes with the change of the input video signal, and the user There is a problem that the display quality is deteriorated as well as giving a sense of discomfort to the display. For example, the change in the brightness (brightness) of the setting menu screen is easily perceived by the user, and is a problem that is greatly related to display quality.

  The present invention has been made in view of the above problems, and even when the screen luminance is dynamically optimized in accordance with the input video signal to improve image quality and reduce power consumption, It is an object of the present invention to provide an image display device capable of preventing a deterioration in display quality due to fluctuations in OSD display luminance.

  The first invention of the present application is based on a light receiving type light modulation means for displaying an input video signal using a backlight light source, a means for detecting a feature quantity of the input video signal, and the detected feature quantity. Means for dynamically variably controlling the light emission luminance of the backlight light source, wherein when the predetermined on-screen display image signal is displayed superimposed on the input video signal, the input video signal There is provided a means for maintaining the light emission luminance of the backlight light source substantially constant regardless of the change in the feature amount.

  The second invention of the present application is based on the light receiving type light modulation means for displaying the input video signal using a backlight light source, the means for detecting the feature quantity of the input video signal, and the detected feature quantity. Means for dynamically variably controlling the light emission luminance of the backlight light source, wherein when the predetermined on-screen display image signal is displayed superimposed on the input video signal, the input video signal There is provided means for reducing the change rate of the light emission luminance of the backlight light source that follows the change in the feature amount of the backlight.

  In the third invention of the present application, the feature amount of the input video signal is obtained by any one or a combination of two or more of an average luminance level, a maximum luminance level, a minimum luminance level, and a luminance distribution state in one frame. It is characterized by being.

  According to the image display device of the present invention, the OSD display is performed even when the luminance of the backlight is dynamically changed according to the input video signal to improve the image quality and reduce the power consumption. In this case, regardless of changes in the feature amount of the input video signal, high-quality OSD display with constant luminance (brightness) can always be performed by maintaining the light emission luminance of the backlight light source substantially constant. It becomes possible.

  Further, according to the image display device of the present invention, even when the backlight emission luminance is dynamically changed according to the input video signal to improve the image quality and reduce the power consumption, the OSD display is performed. When reducing the luminance (brightness) of the OSD display, the user always cares about fluctuations in the luminance (brightness) of the OSD display by reducing the change rate of the light emission luminance of the backlight light source that follows the change in the feature amount of the input video signal. Thus, high-quality OSD display can be performed.

  Hereinafter, an embodiment of an image display device according to the present invention will be described in detail with reference to FIGS. 1 and 2 for a direct-view type liquid crystal display device. Description is omitted. Here, FIG. 1 is a block diagram showing a schematic configuration of the liquid crystal display device of the present embodiment, and FIG. 2 is a flowchart showing operation control in the liquid crystal display device of the present embodiment.

  As shown in FIG. 1, the liquid crystal display device according to the present embodiment is detected by an APL detection unit 6 that detects an average luminance level (APL) per screen as a feature amount of an input video signal, and the APL detection unit 6. And a control microcomputer 18 that drives and controls the light source driving unit 10 based on the average luminance level of the input video signal and modulates the light emission luminance of the backlight light source 9. The control microcomputer 18 detects and analyzes the instruction signal received by the remote control light receiving unit 7 and controls the OSD unit 1 to superimpose (synthesize) a predetermined on-screen display image signal on the input video signal. When the on-screen display image signal is displayed superimposed on (combined with) the input video signal, the brightness modulation function of the backlight light source 9 is controlled to be stopped.

  That is, during normal video display, the control microcomputer 18 drives the light source so as to decrease the light emission luminance of the light source 9 when the average luminance level (APL) of the input video signal is large and increase the light emission luminance of the light source 9 when the average luminance level is small. The driving of the light source driving unit 10 is controlled so as to keep the light emission luminance of the light source 9 constant regardless of the average luminance level (APL) of the input video signal during OSD display.

  In the liquid crystal display device of this embodiment, either a direct type backlight system or a side edge type backlight system may be used, and the light source 9 is a cold cathode tube (CCFL) that is generally used at present. In addition, a light emitting diode (LED) or the like can be used. Needless to say, the luminance control method of the light source 9 is not limited to voltage (or current) control, and may employ duty control.

  Next, the operation of the control microcomputer 18 in the liquid crystal display device of this embodiment will be described with reference to the flowchart of FIG. The average luminance level (APL (n)) in the current frame of the input video signal is input (step 1), it is determined whether OSD display is being performed (step 2), and if OSD display is present, the backlight is displayed. Return to step 1 without performing drive control of the light source 9.

  If there is no OSD display, the average luminance level (APL (n)) in the current frame is compared with the average luminance level (APL (n-1)) in the previous frame (step 3), and the average luminance level of the current frame is determined. When (APL (n)) increases, the drive voltage value (or current value) of the backlight light source 9 is decreased to decrease the light source luminance (step 4).

  Similarly, the average luminance level before and after one frame is compared (step 5). If the average luminance level (APL (n)) of the current frame decreases, the driving voltage value (or current value) of the backlight source 9 is reduced. To increase the light source luminance (step 6).

  In steps 4 and 6, the light source drive control corresponding to the average luminance level (APL (n)) of the current frame is actually performed by referring to a lookup table or by using an approximate function. The light emission luminance of the backlight light source 9 can be varied by obtaining the signal and outputting it to the light source driving unit 10.

  As described above, the liquid crystal display device of the present embodiment dynamically modulates the light emission luminance (light quantity) of the backlight light source 9 according to the average luminance level (APL) of the input video signal during normal display. At the time of OSD display, the light emission luminance of the backlight light source 9 is controlled to be constant, so that it is possible to prevent the luminance (brightness) of the OSD display from fluctuating with the change in the content of the input video signal.

  That is, during normal display, the emission luminance of the backlight light source is dynamically variably controlled according to the input video signal to improve image quality and reduce power consumption, while always during OSD display. It is possible to provide a high-quality OSD display with a constant luminance (brightness).

  Next, other embodiments of the image display device of the present invention will be described, but the description of the same parts as those of the above-described embodiment will be omitted. In the embodiment of the present invention, when OSD display is performed, the light emission luminance of the backlight light source 9 is kept substantially constant regardless of the change in the feature amount of the input video signal. In the liquid crystal display device, the luminance modulation function of the backlight light source is not completely stopped, but when OSD display is performed, the change rate of the light emission luminance of the backlight light source that follows the change in the feature amount of the input video signal. It is characterized by lowering.

  That is, the average luminance level detected by the APL detection unit 6 is converted for each unit field period according to a preset conversion function or conversion table (which may be a low-pass filter), and the light source drive control for controlling the light emission luminance of the light source 9 is performed. By changing the conversion function and conversion table depending on the presence or absence of OSD display, a change rate of the light source drive control signal that changes for each unit field following the change of the average luminance level of the input video signal ( Change amount).

  Therefore, in the present embodiment, when there is OSD display, the backlight source 9 is set at a rate of change that is slow enough not to be perceived by the user by setting a larger time constant than in normal display. It is possible to variably control the light emission luminance of the OSD and to prevent the OSD display luminance (brightness) from fluctuating rapidly and giving the user a sense of incongruity. That is, it is possible to always suppress the variation in the brightness (brightness) of the OSD display to the extent that the user does not care, and it is possible to perform high-quality OSD display.

  In the present embodiment, the time constant of the conversion function or conversion table is switched as means for reducing the change rate of the light emission luminance of the backlight source 9 that follows the change in the average luminance level of the input video signal. However, the present invention is not limited to this. For example, as a configuration for variably controlling the light emission luminance of the backlight light source 9 based on the average value of the average luminance level of the past N frames, when there is OSD display, N is greater than that during normal display. It is also possible to reduce the change rate of the light emission luminance of the backlight light source 9 by increasing the value of.

  In each of the above-described embodiments of the present invention, the description has been given of the case where the luminance of the backlight light source is variably controlled using the average luminance level (APL) in one frame as the feature amount of the input video signal. However, the present invention is not limited thereto, and the maximum luminance level and minimum luminance level in one frame, the luminance distribution state (histogram) are used as the feature amount of the input video signal, or the backlight is based on the feature amount obtained by combining them. The emission luminance of the light source may be variably controlled. Furthermore, not only the feature amount targeting all the pixels (pixels) for one screen, but also a feature amount targeting only pixels (pixels) of a specific partial area in one screen may be used.

  In each of the embodiments of the present invention described above, when the average luminance level (APL) of the input video signal is large, the emission luminance of the backlight light source is decreased, and the average luminance level (APL) of the input video signal is small. Has been described for increasing the light emission luminance of the backlight light source, but it is apparent that the present invention may be applied to a device that performs luminance modulation opposite to this. Further, in each of the embodiments of the present invention described above, only the light emission luminance of the backlight light source is variably controlled according to the feature amount of the input video signal. In conjunction with this, gradation correction of the input video signal is performed. It is good also as a structure which performs control.

  Furthermore, in the above-described embodiment of the present invention, a direct-view type liquid crystal display device has been described. However, the present invention may be applied to a projection type liquid crystal display device, and includes a light receiving type light modulation means and a backlight light source. Needless to say, any image display apparatus that displays an image by using it may be used.

  Any device that displays an image using a light receiving type light modulation means may be used, and is applicable not only to familiar devices such as a television receiver and a personal computer, but also to measuring devices, medical devices, general industrial devices, and the like. .

It is a block diagram which shows schematic structure in one Embodiment of this invention. It is a flowchart which shows the control action in one Embodiment of this invention. It is a block diagram which shows schematic structure in the conventional liquid crystal display device. It is explanatory drawing which shows the relationship between the average luminance level of the input video signal in a conventional liquid crystal display device, and screen luminance. It is explanatory drawing which shows the brightness | luminance of the image display in the conventional liquid crystal display device, and the brightness | luminance of OSD display.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 OSD part 2 Liquid crystal controller 3 Liquid crystal panel 4 Gate driver 5 Source driver 6 APL detection part 7 Remote control light-receiving part 9 Light source 10 Light source drive part 18 Control microcomputer

Claims (3)

  1. A light receiving type light modulating means for displaying an input video signal using a backlight light source;
    Means for detecting a feature quantity of the input video signal;
    Means for dynamically variably controlling the emission luminance of the backlight light source based on the detected feature amount,
    When a predetermined on-screen display image signal is displayed by being superimposed on the input video signal, there is provided means for holding the emission luminance of the backlight light source substantially constant regardless of the feature amount of the input video signal. A characteristic image display device.
  2. A light receiving type light modulating means for displaying an input video signal using a backlight light source;
    Means for detecting a feature quantity of the input video signal;
    Means for dynamically variably controlling the emission luminance of the backlight light source based on the detected feature amount,
    When a predetermined on-screen display image signal is displayed superimposed on the input video signal, there is provided means for reducing the change rate of the emission luminance of the backlight light source that follows the feature quantity of the input video signal. An image display device.
  3. In the image display device according to claim 1 or 2,
    The feature amount of the input video signal is obtained by one or a combination of two or more of an average luminance level, a maximum luminance level, a minimum luminance level, and a luminance distribution state in one frame. Image display device.


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Cited By (13)

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WO2007091508A1 (en) * 2006-02-08 2007-08-16 Sharp Kabushiki Kaisha Liquid crystal display device
JP2008052131A (en) * 2006-08-25 2008-03-06 Micro Space Kk Liquid crystal backlight driving device
JP2008129251A (en) * 2006-11-20 2008-06-05 Hitachi Ltd Liquid crystal display device, backlight dimming device, and method
JP2008225132A (en) * 2007-03-14 2008-09-25 Renesas Technology Corp Drive circuit for display
EP1983505A1 (en) * 2006-02-08 2008-10-22 Sharp Corporation Liquid crystal display device
JP2008299191A (en) * 2007-06-01 2008-12-11 Sharp Corp Image display device
JP2012073631A (en) * 2011-11-18 2012-04-12 Sony Corp Display device and driving method therefor
JP2012242672A (en) * 2011-05-20 2012-12-10 Canon Inc Liquid crystal display and control method thereof
US8432337B2 (en) 2010-01-22 2013-04-30 Samsung Display Co., Ltd. Method of controlling luminance of a light source and display apparatus for performing the method
WO2013094140A1 (en) 2011-12-19 2013-06-27 Canon Kabushiki Kaisha Image display apparatus and control method thereof
JP2013250341A (en) * 2012-05-30 2013-12-12 Canon Inc Display control device, and method of controlling display control device
JP2015022153A (en) * 2013-07-19 2015-02-02 セイコーエプソン株式会社 Image displaying apparatus, and image displaying method
TWI484820B (en) * 2008-05-08 2015-05-11 Univ Nat Chunghsing A image correction circuit, and a display device including the image correction circuit

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JP2000330542A (en) * 1999-05-21 2000-11-30 Mitsubishi Electric Corp Display device and its control method
JP2001027890A (en) * 1999-05-10 2001-01-30 Matsushita Electric Ind Co Ltd Picture display device and picture display method

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JP2001027890A (en) * 1999-05-10 2001-01-30 Matsushita Electric Ind Co Ltd Picture display device and picture display method
JP2000330542A (en) * 1999-05-21 2000-11-30 Mitsubishi Electric Corp Display device and its control method

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007091508A1 (en) * 2006-02-08 2007-08-16 Sharp Kabushiki Kaisha Liquid crystal display device
US8089449B2 (en) 2006-02-08 2012-01-03 Sharp Kabushiki Kaisha Liquid crystal display apparatus
EP1983505A1 (en) * 2006-02-08 2008-10-22 Sharp Corporation Liquid crystal display device
EP1983505A4 (en) * 2006-02-08 2009-10-28 Sharp Kk Liquid crystal display device
JP2008052131A (en) * 2006-08-25 2008-03-06 Micro Space Kk Liquid crystal backlight driving device
JP4643545B2 (en) * 2006-11-20 2011-03-02 株式会社日立製作所 Liquid crystal display device
JP2008129251A (en) * 2006-11-20 2008-06-05 Hitachi Ltd Liquid crystal display device, backlight dimming device, and method
JP2008225132A (en) * 2007-03-14 2008-09-25 Renesas Technology Corp Drive circuit for display
JP2008299191A (en) * 2007-06-01 2008-12-11 Sharp Corp Image display device
TWI484820B (en) * 2008-05-08 2015-05-11 Univ Nat Chunghsing A image correction circuit, and a display device including the image correction circuit
US8432337B2 (en) 2010-01-22 2013-04-30 Samsung Display Co., Ltd. Method of controlling luminance of a light source and display apparatus for performing the method
JP2012242672A (en) * 2011-05-20 2012-12-10 Canon Inc Liquid crystal display and control method thereof
US8970470B2 (en) 2011-05-20 2015-03-03 Canon Kabushiki Kaisha Display apparatus and control method thereof
JP2012073631A (en) * 2011-11-18 2012-04-12 Sony Corp Display device and driving method therefor
KR20140105010A (en) 2011-12-19 2014-08-29 캐논 가부시끼가이샤 Image display apparatus and control method thereof
WO2013094140A1 (en) 2011-12-19 2013-06-27 Canon Kabushiki Kaisha Image display apparatus and control method thereof
US9501979B2 (en) 2011-12-19 2016-11-22 Canon Kabushiki Kaisha Image display apparatus and control method thereof
JP2013250341A (en) * 2012-05-30 2013-12-12 Canon Inc Display control device, and method of controlling display control device
JP2015022153A (en) * 2013-07-19 2015-02-02 セイコーエプソン株式会社 Image displaying apparatus, and image displaying method

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