WO2011104979A1 - 画像表示装置 - Google Patents
画像表示装置 Download PDFInfo
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- WO2011104979A1 WO2011104979A1 PCT/JP2010/072577 JP2010072577W WO2011104979A1 WO 2011104979 A1 WO2011104979 A1 WO 2011104979A1 JP 2010072577 W JP2010072577 W JP 2010072577W WO 2011104979 A1 WO2011104979 A1 WO 2011104979A1
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- aperture ratio
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control 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
- G09G3/34—Control 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
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/08—Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control 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
- G09G3/34—Control 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
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control 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
- G09G3/34—Control 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
- G09G3/36—Control 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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
Definitions
- the present invention relates to an image display device capable of color display, and more particularly to an image display device that performs color display by a field sequential method.
- color displays such as television receivers and personal computer monitors as image display devices capable of color display use three primary colors of red, green, and blue, and express an image by a color mixing method called additive color mixing.
- the current general color display performs color display using color filters colored in R (red), G (green), and B (blue).
- a color display that performs color display without using a color filter has also been proposed.
- a field sequential type color display that sequentially emits red, green, and blue backlights.
- this field sequential type color display for example, there is a liquid crystal display device disclosed in Patent Document 1. In the liquid crystal display device, one frame is divided into three sub-frames corresponding to RGB, and color display is performed by sequentially emitting red, green, and blue backlights.
- one frame is simply divided into three sub-frames corresponding to the RGB color image signals. Therefore, depending on the image, appropriate RGB color mixing in one frame is not performed, and color breakup occurs. (Color braking: CB) occurs, resulting in a problem that display quality is deteriorated.
- Patent Document 2 does not simply divide into three subframes corresponding to RGB image signals, but instead divides one TV field period into three subfields as shown in FIG. All G image signals and R and B image signals in the displayable range are also displayed in one subframe, and R and B image signals that could not be displayed first are displayed in the remaining two subframes.
- a method for mitigating CB is disclosed.
- Japanese Patent Publication Japanese Patent Laid-Open No. 5-346570 (published on December 27, 1993)” Japanese Patent Publication “Japanese Unexamined Patent Application Publication No. 2009-134156 (published on June 18, 2009)”
- an LED backlight is usually used for area active control. For this reason, although the occurrence of CB can be suppressed by area active control, if the correction considering the luminance distribution of the LED is simply performed to display the original image faithfully, the luminance may be insufficient depending on the image.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide an image display device capable of performing color display correctly without a lack of luminance.
- the present invention provides a display unit including a plurality of pixels having a light-transmitting display area, and a plurality of lights that emit light of different colors from the back side of the display area of the display unit.
- An image display that performs color image display by controlling the aperture ratio indicating the transmittance of the pixels of the display means by the light emission of the backlight light source according to the input video signal
- a first subframe in which at least a first color light source emits light
- a second subframe in which at least a second color light source emits light
- a third color light source in one frame of a video signal.
- the aperture ratio corresponding to the pixel of the first color is corrected based on the video signal of the first color included in the first subframe, and the second frame included in the second subframe is corrected.
- Color picture The aperture ratio corresponding to the second color pixel is corrected based on the signal, and the aperture ratio corresponding to the third color pixel is determined based on the third color video signal included in the third subframe.
- the present invention provides a display unit including a plurality of pixels having a light-transmitting display area, and a backlight including a plurality of light sources that emit light of different colors from the back side of the display area of the display unit.
- a display unit including a plurality of pixels having a light-transmitting display area, and a backlight including a plurality of light sources that emit light of different colors from the back side of the display area of the display unit.
- a sub that divides the frame into a first sub-frame in which at least a light source of a first color emits light, a second sub-frame in which a light source of at least a second color emits light, and a third sub-frame in which a light source of third color emits light.
- a sub-frame generator that corrects an aperture ratio corresponding to the pixel of the first color based on a video signal of the first color included in the first sub-frame.
- a second aperture ratio correction unit that corrects an aperture ratio corresponding to the pixel of the second color based on the second color video signal included in the second subframe, and the third subframe.
- a third aperture ratio correction unit that corrects the aperture ratio corresponding to the third color pixel based on the third color video signal, and the first aperture ratio correction unit in the first subframe.
- the aperture ratio corrected by the second aperture ratio correction unit in the second subframe is corrected in accordance with the difference of the display signals calculated in the first subframe.
- the present invention provides a display unit having a plurality of pixels in which the display region has light transparency, and a backlight including a plurality of light sources that emit light of different colors from the back side of the display region of the display unit.
- a display method of an image display apparatus wherein an image ratio is displayed by controlling an aperture ratio indicating a transmittance of a pixel of the display means by light emission of a light source of the backlight according to an input video signal. Is divided into a first subframe in which at least the light source of the first color emits light, a second subframe in which the light source of at least the second color emits light, and a third subframe in which the light source of the third color emits light.
- the sub-frame generating step for generating the sub-frame and the sub-frame generating step are performed on the first color pixel based on the first color video signal included in the first sub-frame.
- the difference from the video signal of the second color included in the sub-frame is obtained, and the aperture ratio corrected in the second aperture ratio correction step in the second sub-frame is calculated from the display signal obtained in the first sub-frame. It is characterized in that corrected in accordance with the minutes.
- one frame of the video signal is divided into three subframes, and at least the first color light source emits light in the first subframe, and at least the second color light source emits light in the second subframe. Since the light source of the third color emits light in the third subframe, one frame of video signal can be displayed in color.
- color braking may occur. Therefore, in addition to the light source of the first color in the first subframe, the light source of the second color and the third color may be emitted. Good. That is, depending on the video signal, color braking may occur, so that in addition to the green (G) light source, the red (R) and blue (B) light sources are emitted in the first subframe. do it.
- the aperture ratio corresponding to the first color pixel is corrected based on the first color video signal included in the first subframe, the second color pixel,
- the aperture ratio corresponding to the third color pixel is the same as the corrected aperture ratio corresponding to the first color pixel. For this reason, when the corrected aperture ratio is smaller than the aperture ratios corresponding to the second color pixel and the third color pixel, there is a problem that the luminance is insufficient in the second subframe and the third subframe. .
- the aperture ratio corrected by the first aperture ratio correction unit in the first subframe, and the luminance distribution of the light source corresponding to the video signal of the second color included in the first subframe The difference between the display signal obtained from the second subframe and the second color video signal included in the first subframe is obtained, and the aperture ratio corrected by the second aperture ratio correction unit in the second subframe is calculated as described above.
- the aperture ratio of the second color in which all video signals are displayed can be appropriately corrected in the second subframe, but the corrected aperture ratio of the second color is the third aperture.
- the aperture ratio is smaller than that obtained based on the color video signal, there is a problem that the luminance is insufficient in the third subframe.
- the subframe generation unit further converts the aperture ratio corrected by the first aperture ratio correction unit in the first subframe and the video signal of the third color included in the first subframe.
- a difference between the display signal obtained from the luminance distribution of the corresponding light source and the video signal of the third color included in the first subframe is obtained and corrected by the second aperture ratio correction unit in the second subframe.
- the aperture ratio corrected by the third aperture ratio correction unit in the third subframe is obtained in the display signal difference obtained in the first subframe and in the second subframe. It may be to correct in accordance with the sum difference of the difference between the display signal.
- the corrected aperture ratio corrects the aperture ratio corrected in the third sub-frame according to the above-mentioned total difference.
- the video signal of the third color can be appropriately displayed.
- the light source of the backlight is preferably driven independently for each predetermined area.
- the first color, the second color, and the third color are not particularly limited as long as they are colors that perform color display.
- the first color is a green (G) color
- the second color is a red color.
- the third color is a blue (B) color
- the first color is a yellow (Y) color
- the second color is cyan (C).
- the third color is a magenta (M) color.
- the present invention has a display means in which a display area is composed of a plurality of light-transmitting pixels, and a backlight comprising a plurality of light sources that emit light of different colors from the back side of the display area of the display means.
- a display area is composed of a plurality of light-transmitting pixels
- a backlight comprising a plurality of light sources that emit light of different colors from the back side of the display area of the display means.
- Subframe generation divided into a first subframe in which at least a first color light source emits light, a second subframe in which at least a second color light source emits light, and a third subframe in which a third color light source emits light
- a first aperture ratio correction unit configured to correct an aperture ratio corresponding to the first color pixel based on a first color video signal included in the first subframe
- a second aperture ratio correction unit configured to correct an aperture ratio corresponding to the pixel of the second color based on a video signal of the second color included in the second subframe
- a third aperture included in the third subframe
- a third aperture ratio correction unit that corrects the aperture ratio corresponding to the pixel of the third color based on the color video signal, and is corrected by the first aperture ratio correction unit in the first subframe.
- the aperture ratio corrected by the second aperture ratio correction unit in the second subframe is corrected according to the difference between the display signals obtained in the first subframe.
- FIG. 1 is a schematic block diagram of a liquid crystal display device according to Embodiment 1 of the present invention.
- FIG. 2 is a schematic block diagram of a subframe generation unit provided in the liquid crystal display device shown in FIG. 1.
- FIG. 9 is a schematic block diagram of a sixth processing block and a seventh processing block in the subframe generation unit shown in FIG. 2.
- (A) (b) is a figure which shows the flow of a process until the sub-frame display of an image
- FIG. 2 is a diagram showing a relationship between backlight luminance and field period in the liquid crystal display device shown in FIG. 1 for each RGB.
- (A)-(d) is a figure which shows the flow of the display process of the sub-frame of this application.
- (A)-(c) is a figure which shows the flow of the display process of the conventional sub-frame. It is the figure which showed the relationship between the backlight brightness
- FIG. 1 is a schematic block diagram when the image display device of the present invention is applied to a liquid crystal display device.
- a liquid crystal display device 101 includes a liquid crystal panel (display means) 1 having a display area composed of a plurality of light-transmitting pixels, and different colors from the back side of the display area of the liquid crystal panel 1.
- Backlight device 2 composed of a plurality of light sources for irradiating light, source driver 3, gate driver 4, backlight data processing unit 5, video signal input unit 6, LUT 7 (Look-Up Table), RGB signal processing unit 8, color A signal correction unit 9, a subframe generation unit 10, a data delay processing unit 11, and a driver control unit 12 are included.
- the liquid crystal display device 101 performs color image display by a field sequential method, and performs area active drive control in which the light source of the backlight is driven independently for each predetermined area. Therefore, the liquid crystal used in the liquid crystal panel 1 is a ferroelectric liquid crystal having a high response speed suitable for a field sequential method, and the backlight device 2 includes a light emitting diode (LED: Light : Emitting) as a light emitting element. An LED backlight system using a diode is used. In the backlight device 2, a plurality of LEDs of R (red) as the first color, G (green) as the second color, and B (blue) as the third color are arranged in a plane. .
- LED light emitting diode
- the liquid crystal display device 101 includes a video signal input unit 6 that receives and processes an externally input video signal, an LUT 7 in which predetermined data is stored in advance, and an RGB connected to the video signal input unit 6.
- a backlight data processing unit 5 connected between the correction unit 9 and the data delay processing unit 11, and a source driver 3 and a gate driver 4 connected to the driver control unit 12 are provided.
- the driver control unit 12 outputs an instruction signal to the source driver 3 and the gate driver 4 in accordance with the video signal input to the video signal input unit 6, so that the liquid crystal panel 1 is driven in units of pixels, and
- the backlight data processing unit 5 outputs an instruction signal to the backlight device 2, each LED constituting the backlight device 2 is driven to turn on.
- the processing unit 5 constitutes a control unit that performs drive control of the liquid crystal panel 1 and the backlight device 2 using the input video signal.
- the video signal input unit 6 is input with a composite video signal including a color signal indicating a display color in a display image, a luminance signal of a pixel unit luminance signal, a synchronization signal, and the like from an antenna (not shown) as a video signal.
- a composite video signal including a color signal indicating a display color in a display image, a luminance signal of a pixel unit luminance signal, a synchronization signal, and the like from an antenna (not shown) as a video signal.
- the composite video signal input to the video signal input unit 6 is output only to the RGB signal processing unit 8.
- the RGB signal processing unit 8 converts the composite video signal from the video signal input unit 6 into an RGB separate signal by performing chroma processing, matrix conversion processing, and the like, and converts the converted RGB separate signal into a subsequent stage. Output to the color signal correction unit 9. That is, the RGB signal processing unit 8 obtains an RGB separate signal indicating each RGB display gradation value from the input composite video signal, and outputs the RGB separate signal to the color signal correcting unit 9 at the subsequent stage.
- the color signal correction unit 9 performs a predetermined correction process on the input RGB separate signal, which is determined based on the color reproduction range and display mode in the liquid crystal panel 1 mounted on the liquid crystal display device 101. And converted into a video signal (R′G′B ′ separate signal). More specifically, the color signal correction unit 9 receives an external light intensity (light quantity) measurement result from an optical sensor (not shown) provided in the liquid crystal display device 101. The color signal correction unit 9 calculates a change in the color reproduction range due to the influence of the external light on the liquid crystal panel 1 using the measurement result, and performs color conversion so that the optimum display color is obtained in the state of the external light. Process.
- the color signal correction unit 9 reads a color signal of a specific color such as human skin, corrects the signal value to a color that the user feels preferable, or inputs from a remote controller or the like attached to the liquid crystal display device 101.
- the brightness of the entire display surface is increased or decreased according to the displayed display mode.
- the color signal correction unit 9 outputs the converted video signal (R′G′B ′ separate signal) to the subframe generation unit 10 and the backlight data processing unit 5 at the subsequent stage.
- the subframe generation unit 10 divides one frame period into three from the signal value of the video signal (R′G′B ′ separate signal) from the color signal correction unit 9 to generate three subframes. .
- the data of these three subframes is output to the data delay processing unit 11 at the subsequent stage.
- the subframe is a frame period including data (luminance values of each color) to be displayed in one subfield when one TV field (for example, 60 Hz) is divided into three subfields (each 180 Hz).
- data luminance values of each color
- the above three sub-frames There are many methods for dividing the above three sub-frames. For example, in the first sub-frame, all of the G (green) display data and a part of the R (red) and B (blue) display data are included. So that the second subfield includes all of the remaining R (red) display data that could not be displayed in the first subfield and part of the B (blue) display data. In addition, one frame period is divided so that the third subframe includes all the display data of B (blue) that could not be displayed in the second subframe.
- the data delay processing unit 11 delays the data of the instruction signal output from the driver control unit 12 to the liquid crystal panel 1 side in order to match the operation timing of the liquid crystal panel 1 and the operation timing of the backlight device 2. It is.
- the data delay processing unit 11 generates the subframe based on the synchronization signal included in the composite video signal from the video signal input unit 6 and the backlight lighting timing signal from the backlight data processing unit 5. The timing for outputting the data of the three subframes sent from the generation unit 10 to the driver control unit 12 is adjusted.
- the driver control unit 12 outputs an instruction signal for driving the liquid crystal panel 1 to the source driver 3 and the gate driver 4 based on the data of the three subframes from the data delay processing unit 11.
- the backlight data processing unit 5 refers to the data stored in advance in the LUT 7 from the video signal (R′G′B ′ separate signal) from the color signal correction unit 9, and the backlight.
- An instruction signal for area active driving is output to the device 2.
- area active driving is performed on the backlight device 2 in accordance with the video signal displayed on the liquid crystal panel 1.
- subframe generation unit 10 will be described in detail.
- FIG. 2 is a schematic block diagram showing each processing block in the subframe generation unit shown in FIG.
- FIG. 3 is a schematic block diagram showing the sixth and seventh processing blocks shown in FIG.
- FIG. 4 is a diagram for explaining the flow of the display process of the subframe.
- (A) shows the flow of the display process of the first subframe, and (b) shows the flow of the display process of the second subframe. Show.
- the subframe generation unit 10 includes a first processing block B1 to a thirteenth processing block B13. By these processing blocks, data of three subframes (the aperture ratio of each subframe LCD) is displayed. ) Is generated and output.
- the image data (RGB values) read in the first processing block B1 is divided into three subframes according to a certain rule in the second processing block B1. This division method will be described later.
- the first subframe includes 100% of G (green) display data and a part (including 0%) of display data of R (red) and B (blue).
- the first subframe LED value is calculated and obtained. The LED value for the first subframe is output to the fifth processing block B5 and the sixth processing block B6.
- the first subframe LCD aperture ratio is calculated and determined in consideration of the first subframe LED value from the fourth processing block B4.
- the LCD aperture ratio for the first subframe is output to the sixth processing block B6.
- the first sub-frame LCD aperture ratio is output to the data delay processing unit 11.
- the RB luminance distribution of the first subframe is calculated from the first subframe LCD value and the R (red) and B (blue) LED values. Details of this calculation will be described later.
- the RB luminance distribution of the first subframe obtained in the sixth processing block B6 is subtracted from the (original) image data. Details of this calculation will be described later.
- the LCD aperture ratio indicates the transmittance of each pixel of the backlight.
- the display luminance in the LED backlight TV system by area control is a value obtained by multiplying the luminance of the backlight (0 to 100%) by the LCD aperture ratio (0 to 100%).
- the backlight (LED value) and the LCD aperture ratio are obtained based on the display data of G (green) of the input image, and display is performed.
- B (blue) backlight may be turned on.
- the LED of R or B is lit at the LCD aperture ratio of G, there may be a state where the display result by the LCD and the LED by correcting PSF (point spread function) is not correct for R and B. That is, the above result is caused by overcorrection of R and B.
- PSF point spread function
- the LED value for the second subframe is calculated and obtained.
- the LED value for the second subframe is output to the ninth processing block B9.
- the second subframe LCD aperture ratio is calculated and obtained in consideration of the second subframe LED value from the eighth processing block B8.
- the LCD aperture ratio for the second subframe is output to the tenth processing block B10.
- the second subframe LCD aperture ratio is output to the data delay processing unit 11.
- the RB luminance distribution of the second subframe is calculated from the second subframe LCD aperture ratio (hereinafter referred to as the LCD value) and the B (blue) LED value. This calculation is the same as in the sixth processing block B6.
- the B luminance distribution of the second subframe obtained in the tenth processing block B10 is subtracted from the (original) image data. This calculation is the same as that in the seventh processing block B7.
- the aperture ratio here is based on the R display data, but it is necessary to correct the overcorrection that occurred in the first subframe.
- the overcorrection amount is subtracted. It is obtained and reflected in the LCD aperture ratio of the second subframe described above to obtain the final LCD aperture ratio of the second subframe. Thereby, the overcorrection of R can be corrected.
- the LED value for the third subframe is calculated and obtained.
- the LED value for the third subframe is output to the thirteenth processing block B13.
- the third subframe LCD aperture ratio is calculated and determined in consideration of the third subframe LED value from the twelfth processing block B12.
- the third subframe LCD aperture ratio is output to the data delay processing unit 11.
- the third sub-frame displays all the remaining B that are not displayed in the first and second sub-frames. Also here, the LCD aperture ratio is subjected to the same processing as that performed in the second subframe in order to correct overcorrection.
- the sixth processing block B6 includes a normalizing unit 111 that normalizes the LCD aperture ratio (data to the LCD) of the first subframe, and an inverse ⁇ transform on the normalized data.
- a multiplication unit 114 that multiplies the data (2) obtained at 113.
- the seventh processing block B7 includes a normalization unit 121 that normalizes the image data from the color signal correction unit 9, and an inverse ⁇ that performs inverse ⁇ conversion on the normalized data.
- the LCD aperture ratio (data to the LCD) of the first sub-frame input to the sixth processing block B6 is an RGB gradation value (for example, 0 to 255 if it is 8 bits long). Value).
- the normalization unit 111 calculates this value as a value between 0 and 1. This calculated value is subjected to inverse ⁇ conversion (here, 1 / 2.2) in the inverse ⁇ conversion unit 112 to obtain a linear value as light. This is because the LED emits light linearly with respect to the signal value given thereto.
- the R / B LED value of the first sub-frame input to the sixth processing block B6 is also the RGB gradation value, and is normalized by the normalizing unit 113 within the processing block. deal with.
- the multiplication unit 114 multiplies the data (1) obtained from the input LCD aperture ratio and the data (2) obtained from the LED value and actually displays the result. Find the luminance distribution.
- RGB gradation values of the image data from the color signal correction unit 9 are input.
- normalization is performed by the normalization unit 121
- inverse ⁇ conversion is performed by the inverse ⁇ conversion unit 122
- the light is handled as a linear value.
- the subtraction unit 123 converts the data (3) indicating the luminance distribution obtained in the sixth processing block B6 from the data (4) indicating the value obtained in the present processing block. By subtracting, it is possible to obtain RGB gradations to be displayed in the second and subsequent subframes.
- the display process of the first subframe is performed as follows.
- the graph showing the relationship between the gradation value and the luminance value of the input image is a gamma curve.
- This graph is converted to linear in (1).
- the backlight LED value (brightness value) is obtained from the G pixel value (gradation value) of the graph linearly converted in (1).
- the G pixel in (1) The LCD aperture ratio is obtained from the value and the LED value of (2).
- PSF correction is performed.
- the graph showing the relationship between the gradation value and the luminance value is returned from the linear to the gamma curve from the LCD aperture ratio obtained in (3).
- the first subframe is displayed using the LED value obtained in (2) and the graph showing the relationship between the gradation value and luminance value of the gamma curve returned in (4).
- the display process of the second subframe is performed as follows.
- the overcorrection of RB occurring in the first subframe is the same as the LED value calculated in the first subframe (in the case of the second subframe) and the LCD. It can be obtained by calculating the luminance distribution based on the aperture ratio and using the difference of the luminance distribution data from the original image data as the original data of the second subframe. This is performed every subframe. (In the case of the second subframe) The luminance distribution of B is calculated based on the LED value calculated in the second subframe and the aperture ratio of the second subframe, and the first subframe and the second subframe are calculated from the original image data. Is the original image data of the third sub-frame.
- FIG. 5 is a diagram for explaining the control of the backlight provided in the liquid crystal display device shown in FIG.
- FIG. 6 is a diagram of processing performed in one area of the LED backlight.
- FIG. 7 is a diagram showing a flow of processing for correcting the aperture ratio of the liquid crystal display device when the processing shown in FIG. 6 is applied.
- the backlight device 2 has a plurality of light emitting areas 2a as shown in FIG.
- the light emitting area 2a is composed of a predetermined number of LEDs.
- the backlight that emits light in each subframe is driven and controlled for each LED light emitting area 2a.
- the phenomenon of color breakage which is a problem, occurs, it can be suppressed only in a small area of the light emitting area 2a of the LED, and the occurrence of color breakup can be suppressed as much as possible. It is possible to perform correction according to the above.
- FIG. 6 shows one TV field (for example, 60 Hz) divided into three subframes (each subfield is 180 Hz), and the displayed content (color) is shown for each of RGB.
- the content (color) displayed in one TV field is the sum of the colors displayed in each subframe.
- Division processing is performed for each area (light emission area 2a shown in FIG. 5) for which area control is performed.
- the division ratio is determined from the values of all the pixels (RGB) in one area.
- the backlight value is set such that the luminance of R becomes the minimum luminance in the pixels in one area. When there is no R data in the area, the R backlight is not turned on.
- the backlight value is set such that the luminance of B is the minimum luminance in the pixels in one area. When there is no B data in the area, the B backlight is not turned on.
- R of RB frame (second subframe) This is the value of the liquid crystal panel 1 and the backlight device 2 that can display all the R data that could not be displayed in the first subframe in one TV field.
- the LCD aperture ratio is determined by the value of G for one subframe (G main). Since the LCD aperture ratio is corrected by the LCD aperture ratio according to the luminance distribution (PSF) of one LED, the original data is corrected. This is performed based on the luminance of the G LED. Then, the G LED is turned on and the R and B are turned on in a possible range with the LCD aperture ratio. However, since the aperture ratio correction is performed for the G LED, the R or B data is not corrected correctly. In other subframes, processing for displaying R that was not displayed in the G main subframe is performed, but normally the aperture ratio closed in that subframe is corrected, so that correction is correctly performed in the G main subframe. R or B that has not been displayed will not be displayed correctly even if all subframes are displayed. In order to avoid this, it is necessary to correct the LCD aperture ratio overcorrection.
- PSF luminance distribution
- FIG. 8A shows the first correction process
- the aperture ratio is corrected based on the data (1) (Green).
- the LED LED corresponding to Green
- the light is turned on as in (3) when aperture ratio correction is not performed.
- aperture ratio correction is performed as shown in (4).
- FIG. 8B shows the second correction process
- red and blue LEDs may be turned on with an aperture ratio of (4), but may be displayed with lower luminance than green LEDs, and in this case, overcorrection (7 ) Is displayed.
- FIG. 8C shows the third correction process.
- the aperture ratio is corrected based on the data (Red) in (8).
- the R data in the second subframe is corrected and displayed correctly, but the overcorrection that occurred in the first subframe is not corrected.
- FIG. 7A shows the first correction process
- the aperture ratio is corrected based on the data (1) (Green).
- the LED LED corresponding to Green
- the light is turned on as in (3) when aperture ratio correction is not performed.
- aperture ratio correction is performed as shown in (4).
- FIG. 7B shows the second correction process
- red and blue LEDs may be turned on with an aperture ratio of (4), but may be displayed with lower luminance than green LEDs, and in this case, overcorrection (7 ) Is displayed.
- the result of (7) is obtained from the aperture ratio correction data of (4) and the luminance distribution of (6), and the overcorrected portion (hatched portion) is calculated.
- the aperture ratio ((4) in FIG. 7) corrected in the first subframe and the luminance distribution of the light source corresponding to the video signal of the second color included in the first subframe ((( 6)) and a difference ((7) in FIG. 7) between the display signal ((7) in FIG. 7) and the second color video signal ((5) in FIG. 7) included in the first subframe. )).
- FIG. 7C shows the third correction process.
- the aperture ratio corrected in the second subframe is corrected based on the data (Red) in (8).
- the R data in the second subframe is correctly corrected and displayed, but the overcorrection of the aperture ratio occurring in the first subframe is not corrected (11).
- the overcorrection generated in the first subframe is corrected again by adding the overcorrection (shaded area) obtained from the display result of (7) to the aperture ratio of this subframe (12).
- the aperture ratio corrected in the second subframe (FIG. 7 (11)) is determined according to the difference between the display signals obtained in the first subframe (the hatched portion in FIG. 7 (7)). (12 in FIG. 7).
- the display result is (10) as in (3) of (a) of FIG.
- the aperture ratio of the second color in which all video signals are displayed can be appropriately corrected in the second subframe, but the corrected aperture ratio of the second color is the third aperture.
- the aperture ratio is smaller than that obtained based on the color video signal, there is a problem that the luminance is insufficient in the third subframe.
- the subframe generation unit further converts the aperture ratio corrected by the first aperture ratio correction unit in the first subframe and the video signal of the third color included in the first subframe.
- a difference between the display signal obtained from the luminance distribution of the corresponding light source and the video signal of the third color included in the first subframe is obtained and corrected by the second aperture ratio correction unit in the second subframe.
- the aperture ratio corrected by the third aperture ratio correction unit in the third subframe is obtained in the display signal difference obtained in the first subframe and in the second subframe. It may be to correct in accordance with the sum difference of the difference between the display signal.
- the corrected aperture ratio corrects the aperture ratio corrected in the third sub-frame according to the above-mentioned total difference.
- the video signal of the third color can be appropriately displayed.
- the display method in the image display apparatus includes a display unit in which a display area is configured by a plurality of light-transmitting pixels and a plurality of light beams of different colors that are irradiated from the back side of the display area of the display unit.
- An image display apparatus that has a backlight composed of a light source and displays an image by controlling an aperture ratio indicating a transmittance of a pixel of the display means by light emission of the light source of the backlight according to an input video signal.
- At least one first sub-frame in which a light source of a first color emits light a second sub-frame in which a light source of at least a second color emits light, and a third light source in which a light source of a third color emits light.
- a subframe generating step of generating a subframe by dividing the subframe into three subframes, and the subframe generating step includes: Accordingly, based on the first aperture ratio correcting step for correcting the aperture ratio corresponding to the first color pixel and the second color video signal included in the second subframe, the second color pixel is corrected.
- the aperture ratio corrected by the second aperture ratio correction step in the second subframe is obtained by obtaining a difference between the display signal obtained from the second subframe and the second color video signal included in the first subframe. 1st And it has a configuration for correcting in accordance with the difference of the display signal obtained by frame.
- LCD aperture ratio correction based on the luminance distribution of LEDs is generally performed in the same frame.
- correction is performed in three subframes constituting one frame. There is a need.
- the R and B results LCD aperture ratio + luminance distribution
- the overcorrected portion is obtained, and the subsequent second and third subframes are obtained. If the overcorrection is corrected, the R and B data can be correctly displayed.
- the present invention is not limited to the three primary colors of RGB, and is a combination of colors for performing other color displays. Also good. For example, even when three colors of Y (yellow), C (cyan), and M (magenta) are used for color display, the same effect can be obtained by the same processing.
- the present invention can be used for a display device capable of color display, particularly a liquid crystal display device for performing color display by a field sequential method.
- Liquid crystal panel (display means) 2 Backlight Device 2a Light Emitting Area 3 Source Driver 4 Gate Driver 5 Backlight Data Processing Unit 6 Video Signal Input Unit 7 LUT 8 RGB signal processing unit 9 Color signal correction unit 10 Subframe generation unit 11 Data delay processing unit 12 Driver control unit 101 Liquid crystal display device (image display device)
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Abstract
Description
図1は、本発明の画像表示装置を液晶表示装置に適用した場合の概略ブロック図を示す。
図2は、図1に示すサブフレーム生成部における各処理ブロックを示した概略ブロック図である。
図5は、図1に示す液晶表示装置に備えられたバックライトの制御を説明するための図である。
本サブフレームで1TVフィールドにおける全てのGデータを表示する必要があるので、液晶パネル1及びバックライト装置2はGデータ全てを表示する値とする。
Gデータとなっている液晶データで、Rの輝度が1エリア内画素で最小の輝度となるようなバックライトの値とする。当該エリア内にRデータがない場合は、Rのバックライトは点灯しない。
Gデータとなっている液晶データで、Bの輝度が1エリア内画素で最小の輝度となるようなバックライトの値とする。当該エリア内にBデータがない場合は、Bのバックライトは点灯しない。
1TVフィールドのうち、第1サブフレームで表示し切れなかったRデータを全て表示できる液晶パネル1及びバックライト装置2の値となる。
上記で決まったRデータとなっている液晶データで、1エリア内における1TVフィールドのデータのうち、第1サブフレームで表示し切れなかった残りのBのなかで最小の輝度となるようなバックライトの値とする。
1TVフィールドのうち、第1サブフレームと第2サブフレームの両サブフレームで表示し切れなかったBデータが全て表示できる液晶パネル1及びバックライト装置2の値となる。
2 バックライト装置
2a 発光エリア
3 ソースドライバ
4 ゲートドライバ
5 バックライトデータ処理部
6 映像信号入力部
7 LUT
8 RGB信号処理部
9 色信号補正部
10 サブフレーム生成部
11 データ遅延処理部
12 ドライバ制御部
101 液晶表示装置(画像表示装置)
Claims (7)
- 表示領域が光透過性を有する複数の画素で構成された表示手段と、
上記表示手段の表示領域の背面側から異なる色の光を照射する複数の光源からなるバックライトと有し、
上記バックライトの光源の発光による上記表示手段の画素の透過率を示す開口率を、入力された映像信号に応じて制御してカラー画像表示を行う画像表示装置において、
映像信号の1フレームを、少なくとも第1色の光源が発光する第1サブフレームと、少なくとも第2色の光源が発光する第2サブフレームと、第3色の光源が発光する第3サブフレームとに分割し、
上記第1サブフレームに含まれる第1色の映像信号に基づいて、上記第1色の画素に対応する開口率を補正し、
上記第2サブフレームに含まれる第2色の映像信号に基づいて、上記第2色の画素に対応する開口率を補正し、
上記第3サブフレームに含まれる第3色の映像信号に基づいて、上記第3色の画素に対応する開口率を補正し、
上記第1サブフレームにおいて補正された開口率と、上記第1サブフレームに含まれる第2色の映像信号に対応する光源の輝度分布とから得られる表示信号と、
上記第1サブフレームに含まれる第2色の映像信号との差分を求めて、
上記第2サブフレームにおいて補正された開口率を、上記第1サブフレームで求めた表示信号の差分に応じて補正することを特徴とする画像表示装置。 - 表示領域が光透過性を有する複数の画素で構成された表示手段と、
上記表示手段の表示領域の背面側から異なる色の光を照射する複数の光源からなるバックライトと有し、
上記バックライトの光源の発光による上記表示手段の画素の透過率を示す開口率を、入力された映像信号に応じて制御してカラー画像表示を行う画像表示装置において、
映像信号の1フレームを、少なくとも第1色の光源が発光する第1サブフレームと、少なくとも第2色の光源が発光する第2サブフレームと、第3色の光源が発光する第3サブフレームとに分割するサブフレーム生成部を備え、
上記サブフレーム生成部は、
上記第1サブフレームに含まれる第1色の映像信号に基づいて、上記第1色の画素に対応する開口率を補正する第1開口率補正部と、
上記第2サブフレームに含まれる第2色の映像信号に基づいて、上記第2色の画素に対応する開口率を補正する第2開口率補正部と、
上記第3サブフレームに含まれる第3色の映像信号に基づいて、上記第3色の画素に対応する開口率を補正する第3開口率補正部とを有し、
上記第1サブフレームにおいて上記第1開口率補正部により補正された開口率と、上記第1サブフレームに含まれる第2色の映像信号に対応する光源の輝度分布とから得られる表示信号と、
上記第1サブフレームに含まれる第2色の映像信号との差分を求めて、
上記第2サブフレームにおいて上記第2開口率補正部により補正された開口率を、上記第1サブフレームで求めた表示信号の差分に応じて補正することを特徴とする画像表示装置。 - 上記サブフレーム生成部は、
上記第1サブフレームにおいて上記第1開口率補正部により補正された開口率と、上記第1サブフレームに含まれる第3色の映像信号に対応する光源の輝度分布とから得られる表示信号と、
上記第1サブフレームに含まれる第3色の映像信号との差分を求めて、
上記第2サブフレームにおいて上記第2開口率補正部により補正された開口率と、上記第2サブフレームに含まれる第3色の映像信号に対応する光源の輝度分布とから得られる表示信号と、
上記第2サブフレームに含まれる第3色の映像信号との差分を求めて、
上記第3サブフレームにおいて上記第3開口率補正部により補正された開口率を、上記第1サブフレームで求めた表示信号の差分及び上記第2サブフレームで求めた表示信号の差分の合計差分に応じて補正することを特徴とする請求項2に記載の画像表示装置。 - 上記第1色は、緑(G)色であり、上記第2色は、赤(R)色であり、上記第3色は、青(B)色であることを特徴とする請求項1~3の何れか1項に記載の画像表示装置。
- 上記第1色は、イエロー(Y)色であり、上記第2色は、シアン(C)色であり、上記第3色は、マゼンタ(M)色であることを特徴とする請求項1~3の何れか1項に記載の画像表示装置。
- 上記バックライトの光源は、所定のエリア毎に独立して駆動することを特徴を請求項1~5の何れか1項に記載の画像表示装置。
- 表示領域が光透過性を有する複数の画素で構成された表示手段と、上記表示手段の表示領域の背面側から異なる色の光を照射する複数の光源からなるバックライトと有し、上記バックライトの光源の発光による上記表示手段の画素の透過率を示す開口率を、入力された映像信号に応じて制御して画像表示を行う画像表示装置の表示方法において、
映像信号の1フレームを、少なくとも第1色の光源が発光する第1サブフレームと、少なくとも第2色の光源が発光する第2サブフレームと、第3色の光源が発光する第3サブフレームとに分割してサブフレームを生成するサブフレーム生成ステップと、
上記サブフレーム生成ステップは、
上記第1サブフレームに含まれる第1色の映像信号に基づいて、上記第1色の画素に対応する開口率を補正する第1開口率補正ステップと、
上記第2サブフレームに含まれる第2色の映像信号に基づいて、上記第2色の画素に対応する開口率を補正する第2開口率補正ステップと、
上記第3サブフレームに含まれる第3色の映像信号に基づいて、上記第3色の画素に対応する開口率を補正する第3開口率補正ステップとを含み、
上記第1サブフレームにおいて上記第1開口率補正ステップにより補正された開口率と、上記第1サブフレームに含まれる第2色の映像信号に対応する光源の輝度分布とから得られる表示信号と、
上記第1サブフレームに含まれる第2色の映像信号との差分を求めて、
上記第2サブフレームにおいて上記第2開口率補正ステップにより補正された開口率を、上記第1サブフレームで求めた表示信号の差分に応じて補正することを特徴とする画像表示装置の表示方法。
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WO2014087876A1 (ja) * | 2012-12-04 | 2014-06-12 | シャープ株式会社 | 画像表示装置およびその駆動方法 |
WO2015019636A1 (ja) * | 2013-08-08 | 2015-02-12 | シャープ株式会社 | 液晶表示装置およびその駆動方法 |
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JP2014209175A (ja) * | 2013-03-27 | 2014-11-06 | キヤノン株式会社 | 画像表示装置 |
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CN105976784B (zh) * | 2016-07-21 | 2018-10-16 | 武汉华星光电技术有限公司 | 显示亮度调整方法 |
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- 2010-12-15 CN CN2010800626621A patent/CN102741912A/zh active Pending
- 2010-12-15 WO PCT/JP2010/072577 patent/WO2011104979A1/ja active Application Filing
- 2010-12-15 EP EP10846642.6A patent/EP2541538A4/en not_active Withdrawn
- 2010-12-15 US US13/576,577 patent/US20120293571A1/en not_active Abandoned
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JPH05346570A (ja) | 1992-06-15 | 1993-12-27 | Seiko Instr Inc | 液晶表示装置 |
JP2002099250A (ja) * | 2000-09-21 | 2002-04-05 | Toshiba Corp | 表示装置 |
JP2009134156A (ja) | 2007-11-30 | 2009-06-18 | Univ Of Electro-Communications | 画像表示の信号処理方法及び画像表示装置 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI497185B (zh) * | 2012-09-12 | 2015-08-21 | Innocom Tech Shenzhen Co Ltd | 顯示裝置 |
WO2014087876A1 (ja) * | 2012-12-04 | 2014-06-12 | シャープ株式会社 | 画像表示装置およびその駆動方法 |
WO2015019636A1 (ja) * | 2013-08-08 | 2015-02-12 | シャープ株式会社 | 液晶表示装置およびその駆動方法 |
JPWO2015019636A1 (ja) * | 2013-08-08 | 2017-03-02 | シャープ株式会社 | 液晶表示装置およびその駆動方法 |
US9728148B2 (en) | 2013-08-08 | 2017-08-08 | Sharp Kabushiki Kaisha | Liquid crystal display apparatus and method of driving the liquid crystal display apparatus |
Also Published As
Publication number | Publication date |
---|---|
EP2541538A4 (en) | 2013-07-31 |
CN102741912A (zh) | 2012-10-17 |
US20120293571A1 (en) | 2012-11-22 |
EP2541538A1 (en) | 2013-01-02 |
JPWO2011104979A1 (ja) | 2013-06-17 |
JP5319836B2 (ja) | 2013-10-16 |
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