CN102298905B - Driving method of electrophoretic display - Google Patents
Driving method of electrophoretic display Download PDFInfo
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- CN102298905B CN102298905B CN201010217921.5A CN201010217921A CN102298905B CN 102298905 B CN102298905 B CN 102298905B CN 201010217921 A CN201010217921 A CN 201010217921A CN 102298905 B CN102298905 B CN 102298905B
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- Prior art keywords
- electrophoretic display
- epd
- display device
- pixel
- pixel voltage
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Classifications
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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
- G09G3/3433—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 light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—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 light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/30—Gray scale
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
-
- 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
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/065—Waveforms comprising zero voltage phase or pause
Abstract
The invention provides a driving method of an electrophoretic display. The driving method comprises the step of stopping providing pixel voltage for the electrophoretic display and maintaining a first time between the steps of providing pixel voltages for two rows of pixel units, wherein the first time can be adjusted. By using the driving method provided by the invention, the electrophoretic display has adjustable frame rate and then has richer gray scale display.
Description
Technical field
The present invention relates to display technique, particularly a kind of driving method of electrophoretic display device (EPD).
Background technology
Electrophoretic display technology relies on leaching electron ion in a liquid to move pixel is brightened or dimmed, is one of the most potential flexible electronic display technique at present.Application number be 200910128148.2 Chinese patent application just a kind of electrophoretic display technology is disclosed.
Along with the development of electrophoretic display technology, electrophoretic display device (EPD) is widely used in the products such as flexible electronic reader, electronic paper and digital signature.
With reference to figure 1, show the schematic diagram of pixel cell in prior art electrophoretic display device (EPD).Wherein, pixel cell includes public electrode 10, pixel electrode 20 and the electrophoresis liquid between public electrode 10 and pixel electrode 20 30.Wherein, described electrophoresis liquid 30 comprises multiple charged particle, and described charged particle comprises the black particle 31 of electronegative white particle 32 and positively charged.Can be positioned at different positions under the effect of charged particle electric field between public electrode 10 and pixel electrode 20, the black particle 32 and the white particle 31 that are positioned at diverse location can make pixel cell demonstrate different colours.Such as, for the first pixel cell 1, under electric field action, black particle 31 is positioned at above white particle 32, because black particle is comparatively strong to the receptivity of light, and electrophoretic display device (EPD) display black; For the second pixel cell 2, under electric field action, white particle 32 is positioned at above black particle, because white particle has stronger reflection potential to light, and electrophoretic display device (EPD) display white.
With reference to figure 2, show the schematic diagram of prior art electrophoretic display device (EPD), described electrophoretic display device (EPD) 11 comprises: the multi-strip scanning line 12 of arranging by row, by row arrangement a plurality of data lines 13, be positioned at sweep trace 12 and data line point of intersection switch 14, with the pixel cell 16 that switch 14 one end is connected and the memory capacitance 15 in parallel with described pixel cell 16.
In the procedure for displaying of electrophoretic display device (EPD) 11, drive unit is by the sweep trace 12 every a line switch 14 of conducting successively, data line 13 is connected with memory capacitance 15 with pixel cell 16, drive unit is charged to memory capacitance 15 by data line 13, until the voltage of memory capacitance 15 reaches the pixel voltage of pixel cell 16, because memory capacitance 15 is in parallel with described pixel cell 16, pixel voltage in memory capacitance 15 loads on the pixel electrode of pixel cell 16, described pixel cell 16 is under different pixels Control of Voltage, black particle can be changed, the relative position relation of white particle, and then demonstrate the image of different GTG.
But inventor finds, in prior art, the GTG display of electrophoretic display device (EPD) is comparatively dull.
Summary of the invention
The invention provides a kind of electrophoretic display device (EPD), with the problem that the GTG display improving electrophoretic display device (EPD) is comparatively dull.
In order to solve the problem, a kind of driving method of electrophoretic display device (EPD), comprising: provide between the step of pixel voltage two row pixel cells, and stop providing pixel voltage to electrophoretic display device (EPD) and keeping the very first time, the described very first time is adjustable.
After the pixel cell that last column pixel to present frame is corresponding provides pixel voltage, export one or more sweep signal to electrophoretic display device (EPD), during this period, stop providing pixel voltage to electrophoretic display device (EPD).
Before the pixel cell that the first row pixel to present frame is corresponding provides pixel voltage, export one or more sweep signal to electrophoretic display device (EPD), during this period, stop providing pixel voltage to electrophoretic display device (EPD); Then pixel voltage is provided to the pixel cell that each row pixel of present frame is corresponding successively.
Also comprise: after the pixel cell that last column pixel to present frame is corresponding provides pixel voltage, export one or more sweep signal to electrophoretic display device (EPD), during this period, stop providing pixel voltage to electrophoretic display device (EPD).
After the pixel cell that the first row pixel to present frame is corresponding provides pixel voltage, provide one or more sweep signal to electrophoretic display device (EPD), during this period, stop providing pixel voltage to electrophoretic display device (EPD); The pixel cell corresponding to ensuing each row pixel, repeats above-mentioned steps.
Also comprise: the initial time presetting the very first time, and the range of adjustment of the very first time.
Compared with prior art, the driving method of electrophoretic display device (EPD) provided by the invention, by regulating the very first time provided between pixel voltage at every turn, make the frame per second of electrophoretic display device (EPD) have certain adjustable extent, described adjustable frame per second makes electrophoretic display device (EPD) have abundant GTG display.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of pixel cell in prior art electrophoretic display device (EPD);
Fig. 2 is the schematic diagram of prior art electrophoretic display device (EPD);
Fig. 3 is the GTG display schematic diagram of electrophoretic display device (EPD) shown in Fig. 2;
Fig. 4 is the schematic diagram of electrophoretic display driving method one embodiment of the present invention;
The schematic diagram of Fig. 5 electrophoretic display driving method one of the present invention embodiment;
The schematic diagram of the sweep signal of Fig. 6 electrophoretic display driving method of the present invention;
The schematic diagram of Fig. 7 another embodiment of electrophoretic display driving method of the present invention;
The schematic diagram of Fig. 8 another embodiment of electrophoretic display driving method of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Described by background technology, inventor finds, in prior art, the GTG display of electrophoretic display device (EPD) is comparatively dull.Inventor, by the image displaying principle of analytical electrophoresis display, attempts to improve the problem that the GTG display of electrophoretic display device (EPD) is comparatively dull.
As shown in Figure 3, when electrophoretic display device (EPD) is in original state, black particle is positioned at public electrode place, white particle is positioned at pixel electrode place, pixel cell display black black; Apply pixel voltage on the pixel electrode, black particle moves down the first distance a under the effect of pixel voltage, white particle moves up the first distance a under the effect of pixel voltage, because the position of now charged particle is different from original state, pixel cell, compared with original state, demonstrates the grey Gray1 of different GTG.Similarly, under the effect of pixel voltage, pixel cell also can show other color, such as, and Gray2, Gray3, White.Wherein, the first distance a is directly proportional to recurrence interval T, the pulse voltage V of pixel voltage, and pulse voltage V is higher, recurrence interval T is longer, then the distance of black, white particle moving can be greater than described first distance a, thus demonstrates different GTGs.
Due in the process of display one two field picture, memory capacitance loads pixel voltage to pixel electrode always, until just terminate, so the time of described display one two field picture equals the recurrence interval during display of next frame image.In prior art, the frame per second of electrophoretic display device (EPD) is fixing (such as frame per second is 50HZ), namely electrophoretic display device (EPD) shows the time of a two field picture is fixing, therefore the described recurrence interval is also fixing, under the condition that pulse voltage is identical, described first distance a is also fixing, and so the displayable GTG of pixel cell is fixing.
Inventor considers that the frame per second by changing electrophoretic display device (EPD) changes the recurrence interval, and under making identical pulse voltage, the distance of black, white particle moving changes, and then makes electrophoretic display device (EPD) can demonstrate different GTGs.
According to the design of foregoing invention people, the invention provides a kind of driving method of electrophoretic display device (EPD), described driving method is providing between the step of pixel voltage to two row pixel cells, stop providing pixel voltage to the arbitrary row pixel cell of electrophoretic display device (EPD) and keeping the very first time, the described very first time is adjustable.
With reference to figure 4, show the schematic diagram of described electrophoretic display driving method one embodiment, said method comprising the steps of:
Step s1, the memory capacitance charging corresponding to the first sweep trace, stops charging when the voltage of memory capacitance reaches pixel voltage, completes the process that the pixel cell be connected to described first sweep trace provides pixel voltage;
Step s2, within the very first time, stop providing pixel voltage to electrophoretic display device (EPD), the described very first time is adjustable;
Step s3, the pixel cell be connected to the second sweep trace provides pixel voltage.
Described driving method, when providing pixel voltage to electrophoretic display device (EPD), arranges an adjustable very first time providing between pixel voltage, within the described very first time, does not provide pixel voltage to electrophoretic display device (EPD).Within the described very first time, although do not provide pixel voltage to electrophoretic display device (EPD), but, memory capacitance is also loading pixel voltage to pixel cell, so within the described very first time, charged particle is still moving, because the described very first time is adjustable, so the distance of charged particle movement is not identical yet, therefore electrophoretic display device (EPD) can demonstrate different GTGs.
Below in conjunction with the specific embodiment of the driving method of electrophoretic display device (EPD), further describe technical scheme of the present invention.
With reference to figure 5, show the schematic flow sheet of driving method one embodiment of electrophoretic display device (EPD) of the present invention, described driving method comprises the following steps:
Step s11, provides sweep signal to electrophoretic display device (EPD) the first row sweep trace, the switch that conducting is connected with the first row sweep trace;
Step s12, provides pixel voltage by data line to the first row pixel cell;
Step s13, repeats step s11 and step s12, walks to last column pixel cell successively provide pixel voltage to electrophoretic display device (EPD) second;
Step s14, exports one or more sweep signal to electrophoretic display device (EPD), during this period, stops providing pixel voltage to electrophoretic display device (EPD).
The present embodiment in step s11 in step s13, the first row to electrophoretic display device (EPD) provides pixel voltage to last column, thus complete the display of a two field picture, after the pixel cell that last column pixel to a two field picture is corresponding provides pixel voltage, before the pixel cell that the first row pixel to next two field picture is corresponding provides pixel voltage, the very first time being set, namely exporting the time of one or more sweep signal, regulating the described very first time by regulating the number of sweep signal.
With reference to figure 6, show the schematic diagram of sweep signal in electrophoretic display driving method shown in Fig. 5.In step s11 in step s13, to the output sweep signal 200,201,202,203 of electrophoretic display device (EPD) 11, the each horizontal scanning line 12 of electric conduction phoretic display successively, and provide pixel voltage by data line 13 to each row pixel cell, thus complete the display of a two field picture.Before providing the pixel voltage of the second two field picture to electrophoretic display device (EPD) the first row sweep trace, in step s14, one or more sweep signal 300,301 is exported to electrophoretic display device (EPD), but stop providing pixel voltage to electrophoretic display device (EPD), in the time of one or more sweep signals of electrophoretic display device (EPD) output, the memory capacitance of pixel cell still loads pixel voltage on pixel cell, and charged particle still moves in the process, and the GTG that electrophoretic display device (EPD) can be made to show changes.Memory capacitance can be regulated to load the time of pixel voltage to pixel cell by the number changing described sweep signal, make the distance of band particle moving different, thus make electrophoretic display device (EPD) demonstrate abundanter GTG.
Driving method above-described embodiment of electrophoretic display device (EPD) can also have other distortion, and with reference to figure 7, show the schematic flow sheet of another embodiment of electrophoretic display driving method of the present invention, described driving method comprises the following steps:
Step s21, exports one or more sweep signal to electrophoretic display device (EPD), during this period, stops providing pixel voltage to electrophoretic display device (EPD);
Step s22, provides sweep signal to electrophoretic display device (EPD) the first row sweep trace, the switch that conducting is connected with the first row sweep trace;
Step s23, provides pixel voltage by data line to the first row pixel cell;
Step s24, repeats step s22 and step s23, walks to last column pixel cell successively provide pixel voltage to electrophoretic display device (EPD) second.
Differently to be from embodiment illustrated in fig. 5, when display one two field picture, pixel voltage is provided at the first row sweep trace to electrophoretic display device (EPD), before the first row pixel showing described frame, one or more sweep signal (sweep signal 100 as shown in Figure 6) is exported to electrophoretic display device (EPD), export in the time of one or more sweep signal at electrophoretic display device (EPD), the memory capacitance of each pixel cell still loads pixel voltage on pixel cell, charged particle still moves in the process, by changing the number of described sweep signal, the distance of band particle moving can be made different, thus make electrophoretic display device (EPD) demonstrate abundanter GTG.
In addition, the driving method of electrophoretic display device (EPD) of the present invention, can also provide to the sweep trace of electrophoretic display device (EPD) pixel voltage realize image display before and after, all export one or more sweep signal to electrophoretic display device (EPD), during this period, pixel voltage is not provided to electrophoretic display device (EPD).
In the above-described embodiments, the driving method of electrophoretic display device (EPD) of the present invention by arranging adjustable very first time between a two field picture and next frame image, to change the frame per second of electrophoretic display device (EPD), the driving method of electrophoretic display device (EPD) of the present invention can also arrange adjustable very first time, to change the frequency of electrophoretic display device (EPD) between the display of a line image and the display of next line image.
With reference to figure 8, show the schematic flow sheet of another embodiment of electrophoretic display driving method of the present invention, comprising:
Step s31, provides sweep signal to electrophoretic display device (EPD) the first row sweep trace, conducting and the switch that the first row sweep trace is connected;
Step s32, by data line to the first row pixel cell input pixel voltage;
Step s33, provides one or more sweep signal to electrophoretic display device (EPD), during this period, stops providing pixel voltage to electrophoretic display device (EPD);
Step s34, repeats step s31 to step s33, walks to last column pixel cell successively provide pixel voltage to electrophoretic display device (EPD) second.
In the present embodiment, when display one two field picture, there is provided between pixel voltage to every row pixel cell, one or more sweep signal is provided, within the time that one or more sweep signal is provided, stops providing pixel voltage to electrophoretic display device (EPD), the time of display a line image can be regulated by the number changing described sweep signal, and then the time of display one two field picture can be regulated, thus make electrophoretic display device (EPD) frame per second be adjustable, the GTG display of electrophoretic display device (EPD) can be increased.
Before electrophoretic display device (EPD) drives, the initial time of the very first time can be pre-set, particularly, be set between the sweep trace of different rows the very first time, or between the image display of different frame.Before electrophoretic display device (EPD) drives, the different very first times can also be pre-set, and the number of the sweep signal corresponding with each very first time.
It should be noted that, in the above-described embodiments, adjustable very first time is set by exporting one or more sweep signal, but the present invention is not restricted to this, those skilled in the art can modify according to above-described embodiment, substitute or distortion.
To sum up, electrophoretic display driving method provided by the invention, by regulating the very first time provided between pixel voltage at every turn, the frame per second of electrophoretic display device (EPD) is made to have certain adjustable extent, particularly, described frame rate adjustment scope is: 40 ~ 100 frames/second, and described adjustable frame per second makes electrophoretic display device (EPD) have abundant GTG display.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection domain of technical solution of the present invention.
Claims (3)
1. a driving method for electrophoretic display device (EPD), is characterized in that, comprising: provide between the step of pixel voltage two row pixel cells, and stop providing pixel voltage to electrophoretic display device (EPD) and keeping the very first time, the described very first time is adjustable, comprising:
After the pixel cell that last column pixel to present frame is corresponding provides pixel voltage, export one or more sweep signal to electrophoretic display device (EPD), during this period, stop providing pixel voltage to electrophoretic display device (EPD);
Or, before the pixel cell that the first row pixel to present frame is corresponding provides pixel voltage, export one or more sweep signal to electrophoretic display device (EPD), during this period, stop providing pixel voltage to electrophoretic display device (EPD); Then pixel voltage is provided to the pixel cell that each row pixel of present frame is corresponding successively;
Or, after the pixel cell that the first row pixel to present frame is corresponding provides pixel voltage, provide one or more sweep signal to electrophoretic display device (EPD), during this period, stop providing pixel voltage to electrophoretic display device (EPD); The pixel cell corresponding to ensuing each row pixel, repeats above-mentioned steps.
2. the driving method of electrophoretic display device (EPD) as claimed in claim 1, it is characterized in that, before providing pixel voltage for the pixel cell corresponding in the first row pixel to present frame, one or more sweep signal is exported to electrophoretic display device (EPD), during this period, stop providing pixel voltage to electrophoretic display device (EPD); Then the situation of pixel voltage is provided to the pixel cell that each row pixel of present frame is corresponding successively,
Described driving method also comprises: after the pixel cell that last column pixel to present frame is corresponding provides pixel voltage, exports one or more sweep signal to electrophoretic display device (EPD), during this period, stops providing pixel voltage to electrophoretic display device (EPD).
3. the driving method of electrophoretic display device (EPD) as claimed in claim 1, is characterized in that, also comprise: the initial time presetting the very first time, and the range of adjustment of the very first time.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010217921.5A CN102298905B (en) | 2010-06-22 | 2010-06-22 | Driving method of electrophoretic display |
| PCT/CN2011/075704 WO2011160554A1 (en) | 2010-06-22 | 2011-06-14 | Drive method for electrophoretic display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010217921.5A CN102298905B (en) | 2010-06-22 | 2010-06-22 | Driving method of electrophoretic display |
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| Publication Number | Publication Date |
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| CN102298905A CN102298905A (en) | 2011-12-28 |
| CN102298905B true CN102298905B (en) | 2015-04-15 |
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| CN201010217921.5A Expired - Fee Related CN102298905B (en) | 2010-06-22 | 2010-06-22 | Driving method of electrophoretic display |
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| Country | Link |
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| CN (1) | CN102298905B (en) |
| WO (1) | WO2011160554A1 (en) |
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| KR102556084B1 (en) | 2016-10-07 | 2023-07-17 | 삼성디스플레이 주식회사 | Display device capable of changing frame rate and operating method thereof |
| CN109427304B (en) * | 2017-09-01 | 2020-07-07 | 晶宏半导体股份有限公司 | Processor for setting frame rate and frame rate setting method |
| CN116453478B (en) * | 2023-06-16 | 2023-10-20 | 惠科股份有限公司 | Display module and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008165145A (en) * | 2007-01-05 | 2008-07-17 | Seiko Epson Corp | Driving method and driving device for electrophoresis display panel, electrophoretic display device, and electronic equipment |
| CN101373581A (en) * | 2002-06-13 | 2009-02-25 | 伊英克公司 | Methods for driving electro-optic displays |
| CN101499239A (en) * | 2008-02-01 | 2009-08-05 | 精工爱普生株式会社 | Method of driving electrophoretic display device, electrophoretic display device, and electronic apparatus |
| CN101533198A (en) * | 2008-03-14 | 2009-09-16 | 精工爱普生株式会社 | Driving method of electrophoretic display device, electrophoretic display device, and electronic apparatus |
| CN101587684A (en) * | 2005-02-28 | 2009-11-25 | 精工爱普生株式会社 | Method of driving electrophoretic display |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101341059B1 (en) * | 2007-08-14 | 2013-12-13 | 삼성디스플레이 주식회사 | Electrophoretic display device and driving method thereof |
-
2010
- 2010-06-22 CN CN201010217921.5A patent/CN102298905B/en not_active Expired - Fee Related
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- 2011-06-14 WO PCT/CN2011/075704 patent/WO2011160554A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101373581A (en) * | 2002-06-13 | 2009-02-25 | 伊英克公司 | Methods for driving electro-optic displays |
| CN101587684A (en) * | 2005-02-28 | 2009-11-25 | 精工爱普生株式会社 | Method of driving electrophoretic display |
| JP2008165145A (en) * | 2007-01-05 | 2008-07-17 | Seiko Epson Corp | Driving method and driving device for electrophoresis display panel, electrophoretic display device, and electronic equipment |
| CN101499239A (en) * | 2008-02-01 | 2009-08-05 | 精工爱普生株式会社 | Method of driving electrophoretic display device, electrophoretic display device, and electronic apparatus |
| CN101533198A (en) * | 2008-03-14 | 2009-09-16 | 精工爱普生株式会社 | Driving method of electrophoretic display device, electrophoretic display device, and electronic apparatus |
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| WO2011160554A1 (en) | 2011-12-29 |
| CN102298905A (en) | 2011-12-28 |
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