CN101471041B - LCD driving method and apparatus and LCD equipment - Google Patents
LCD driving method and apparatus and LCD equipment Download PDFInfo
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Abstract
The invention is suitable for the field of liquid crystal display and provides a method for driving liquid crystal display, a device and a liquid crystal display device, wherein the driving method comprises the following steps: receiving scanning mode signals, judging whether ICON exists in a current application system, when no ICON exists in the current application system, carrying out scanning to pixels of a liquid crystal panel, carrying out the display, when the ICON exists in the current application system, scanning the pixels in a liquid crystal panel matrix area and then scanning the pixels in the ICON area, and carrying out the displaying. The method judges whether the fixed current system icons (ICON) exist in the current application system according to the scanning mode signals, then plays the driving voltage to the liquid crystal display panel with a corresponding scanning mode, realizes the compatibility of various functions under the two application fields, thereby improving the applicability of the liquid crystal display driving device.
Description
Technical field
The invention belongs to field of liquid crystal display, relate in particular to a kind of method for driving liquid crystal display, Apparatus and liquid crystal display equipment.
Background technology
Lcd technology occupies more and more important position in current information shows.And the liquid crystal display drive unit is as the control center of liquid crystal display device, and its function and performance are directly connected to the overall applicability of display device.In current lattice lcd display spare was used, the branch that should be used for from anchor icon (ICON) can be divided into two classes, ICON is promptly arranged and do not have ICON.The liquid crystal display device that does not have ICON is meant that all pixels all are to represent with the rectangle of same size, and what show on whole screen is a complete image.And the liquid crystal display device of ICON is arranged, being meant that most pixel remains with the rectangle of same size represents, and the sub-fraction pixel is arranged, then made anchor icon form with some regular shape, in the matrix pixel zone, what show is a common image information, and in ICON anchor icon zone, some information that can display system, as current electric quantity, mode of operation etc., a is the synoptic diagram that does not have the viewing area of ICON among Fig. 1, and b is the synoptic diagram that the viewing area of ICON is arranged.
ICON is being arranged and do not having under the application mode of ICON, the definition of some function of liquid crystal display drive unit is different, and present liquid crystal display drive unit generally can only be applicable to and a kind of in above two kinds of application has been subjected to certain restriction in application.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of method for driving liquid crystal display, is intended to solve the problem that present type of drive can not be applicable to ICON simultaneously and not have the application mode of ICON.
The embodiment of the invention is achieved in that a kind of method for driving liquid crystal display, said method comprising the steps of:
Receive the scan pattern signal, judge in the current application system to have or not ICON;
In the current application system, during no ICON, the pixel of liquid crystal panel matrix area is lined by line scan, show;
When in the current application system, ICON being arranged, successively, show the pixel of liquid crystal panel matrix area and the picture element scan in ICON zone.
Another purpose of the embodiment of the invention is to provide a kind of liquid crystal display drive unit, and described device comprises:
The column electrode control circuit is used to receive scan pattern signal and column electrode scanning sequency signal, produces first scan control signal, and described scan control signal comprises the scan control information that has or not ICON;
The column electrode driving circuit is used for according to described first scan control signal column electrode being scanned, and when described first scan control signal comprises the scan control information of no ICON, the pixel of liquid crystal panel matrix area is lined by line scan; When described first scan control signal includes the scan control information of ICON, successively the pixel of liquid crystal panel matrix area and the pixel in ICON zone are scanned, show;
The image data ram control circuit is used to receive the scan pattern signal, produces second scan control signal, and described second scan control signal comprises the scan control information that has or not ICON;
The image data random access memory, be used for scanning according to the video data of described second scan control signal to its storage inside, and data are read, when described second scan control signal comprises the scan control information of no ICON, each storage unit of its inside is lined by line scan; When described second scan control signal includes the scan control information of ICON, successively scan to the storage unit corresponding with the regional corresponding storage unit of ICON with the liquid crystal panel matrix area; And
Column electrode drive circuit, the data conversion that is used for reading from described image data random access memory is a corresponding driving voltage, and exports driving voltage to the row electrode.
Another purpose of the embodiment of the invention is to provide a kind of liquid crystal display, and described equipment comprises liquid crystal panel and liquid crystal display drive unit, and described liquid crystal display drive unit comprises:
The column electrode control circuit is used to receive scan pattern signal and column electrode scanning sequency signal, produces first scan control signal, and described first scan control signal comprises the scan control information that has or not ICON;
The column electrode driving circuit is used for according to affiliated first scan control signal column electrode being scanned, and when described first scan control signal comprises the scan control information of no ICON, the pixel of described liquid crystal panel matrix area is lined by line scan; When described first scan control signal includes the scan control information of ICON, successively the pixel of described liquid crystal panel matrix area and the pixel in ICON zone are scanned, show;
The image data ram control circuit is used to receive the scan pattern signal, produces second scan control signal, and described second scan control signal comprises the scan control information that has or not ICON;
The image data random access memory, be used for scanning according to the video data of described second scan control signal to its storage inside, and data are read, when described second scan control signal comprises the scan control information of no ICON, each storage unit of its inside is lined by line scan; When described second scan control signal includes the scan control information of ICON, successively scan to the storage unit corresponding with the regional corresponding storage unit of ICON with described liquid crystal panel matrix area; And
Column electrode drive circuit, the data conversion that is used for reading from described image data random access memory is a corresponding driving voltage, and exports driving voltage to the row electrode.
In the embodiment of the invention, column electrode control circuit in the liquid crystal display drive unit and image data ram control circuit are judged in the current application system according to the scan pattern signal and are had or not ICON, again display panels is applied driving voltage with corresponding scan mode, various functions under two kinds of application scenarios are realized compatibility, thereby improved the applicability of liquid crystal display drive unit.
Description of drawings
Fig. 1 does not have the viewing area of ICON and the synoptic diagram of the display panels of the viewing area that ICON is arranged;
Fig. 2 is the realization flow figure of the method for driving liquid crystal display that provides of the embodiment of the invention;
Fig. 3 a is the scanning sequency deterministic process synoptic diagram of the column electrode in the display panels that provides of the embodiment of the invention;
Fig. 3 b is the scanning sequency deterministic process synoptic diagram of the storage unit in the image data random access memory that provides of the embodiment of the invention;
Fig. 4 is the structure principle chart of the liquid crystal display drive unit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the embodiment of the invention, the liquid crystal display drive unit applies driving voltage to display panels with corresponding scan pattern according to the scan control signal that has or not ICON information in the current application system that comprises that receives, and realizes that image shows.
Fig. 2 shows the realization flow of the method for driving liquid crystal display that the embodiment of the invention provides, and details are as follows:
In step S201, receive the scan pattern signal;
The method for driving liquid crystal display that the embodiment of the invention provides is applicable to two kinds of application systems of ICON and no ICON, to the scan pattern difference of each column electrode in the display panels, need determine concrete scan pattern in two kinds of systems according to concrete application scenario.
In step S202, judge in the current application system to have or not ICON;
In the embodiment of the invention, the scan pattern signal is a digital signal, represent to have or not ICON in the current application system with high level and low level respectively, the scan pattern signal can be by microprocessor (the Micro Processor Unit of liquid crystal display drive unit outside, MPU) produce output, also can realize by external fixing high level or low level signal.For example when the scan pattern signal was low level, being judged as did not have ICON, goes to step S203; When the scan pattern signal is high level, be judged as ICON, go to step S204, criterion will adapt with the situation that specifically is provided with of scan pattern signal certainly.
In step S203, the pixel of liquid crystal panel matrix area is lined by line scan, show;
In the embodiment of the invention, image data random access memory in the liquid crystal display drive unit (Graphic Display Data Random Access Memory, GDDRAM) comprise a plurality of storage unit, and each pixel on the display panels all has corresponding storage unit in GDDRAM, stores the required video data of the pixel corresponding with this unit in each storage unit.During concrete the demonstration, at first the control module by liquid crystal display drive unit inside produces row address signal to determine the initial row address of scanning, storage unit to initial row correspondence among the GDDRAM scans, the video data of initial row is read, column electrode to the initial row correspondence of liquid crystal panel scans then, video data according to each pixel in this row charges to the row electrode, carries out the demonstration of current line; Next line to initial row among the GDDRAM scans again, the reading displayed data, and then the column electrode of the next line correspondence of the initial row of liquid crystal panel scanned, video data according to each pixel in this row charges to the row electrode, show that the scanning of a frame is finished in circulation successively.
Display panels with the capable m row of n pixel is an example, if the initial behavior x of supposition scanning is capable (x≤n), the line number of representing the storage unit among the GDDRAM with PAGE, the line number of representing the column electrode in the liquid crystal panel with COM, then the scanning sequency in GDDRAM is PAGE (x)～PAGE (n), PAGE (0)～PAGE (x-1), at this moment, consider on the liquid crystal panel in the column electrode address and GDDRAM the corresponding relation between the row address of storage unit have positive and negative two kinds may, then the scanning sequency to the column electrode in the liquid crystal panel also has positive and negative two kinds, and forward scan is COM (0)～COM (n) in proper order; Reverse scan is COM (n)～COM (0) in proper order.
In step S204, successively the pixel of liquid crystal panel matrix area and the pixel in ICON zone are scanned, show.
For the situation that ICON is arranged in the application system, must guarantee the scanning in ICON zone is carried out after matrix area is finished a frame scan, still the display panels with the capable m row of n pixel is an example, suppose capable at n with the corresponding video data in liquid crystal panel ICON zone, if the x of initial behavior liquid crystal panel matrix area of scanning is capable (x＜n), then the scanning sequency in GDDRAM is PAGE (x)～PAGE (n-1), PAGE (0)～PAGE (x-1), PAGE (n).Consider on the liquid crystal panel in the column electrode address and GDDRAM the corresponding relation between the row address of storage unit have positive and negative two kinds may, forward scan to the column electrode in the liquid crystal panel is COM (0)～COM (n-1) in proper order, COM (n), reverse scan is COM (n-1)～COM (0) in proper order, COM (n).
Certainly,, then require the scanning in ICON zone was carried out before to matrix area scanning, repeat no more if the initial behavior ICON of scanning is capable.
The scanning sequency deterministic process of the storage unit in column electrode in the display panels and the image data random access memory is respectively shown in Fig. 3 a and Fig. 3 b, for the situation that does not have ICON, in order to control the scanning sequency of column electrode more neatly, adopt the pattern of column electrode scanning sequency external control signal TMY and the dual control of column electrode scanning sequency internal control signal MY, wherein, column electrode scanning sequency external control signal TMY, can be by the outer MPU output of liquid crystal display drive unit, can realize that also column electrode scanning sequency internal control signal MY can then write the programmable register of LCD drive g device inside by outside MPU by external fixing high level or low level signal.Shown in Fig. 3 a, according to the level of TMY and MY height state, when TMY and MY are low level (L) or are high level (H), i.e. TMY=MY=L or TMY=MY=H, the scanning sequency of column electrode is forward scan COM (0)～COM (n); When the level state of TMY and MY is inconsistent, i.e. TMY=L, MY=H or TMY=H, MY=L, the scanning sequency of column electrode is reverse scan COM (n)～COM (0).For the situation that ICON is arranged, MY is inoperative for column electrode scanning sequency internal control signal, when TMY is low level (L), the scanning sequency of column electrode is forward scan COM (0)～COM (n-1), COM (n), when TMY was high level (H), the scanning sequency of column electrode was reverse scan COM (n-1)～COM (0), COM (n).Among Fig. 3 b, in application system, there is not ICON, when being MODE=L, (x≤n), the scanning sequency of storage unit is PAGE (x)～PAGE (n) among the GDDRAM to suppose that the initial behavior x of scanning is capable, PAGE (0)～PAGE (x-1), ICON is arranged in application system, and promptly during MODE=H, the scanning sequency of storage unit is PAGE (x)～PAGE (n-1) in GDDRAM, PAGE (0)～PAGE (x-1), PAGE (n).
Fig. 4 shows the structural principle of the liquid crystal display drive unit that the embodiment of the invention provides, and for convenience of description, only shows the part relevant with the embodiment of the invention.
Column electrode control circuit 41 is according to scan pattern signal MODE, the column electrode scanning sequency external control signal TMY and the column electrode scanning sequency internal control signal MY that receive, produce a series of column electrode address signals, scan clock signal and first scan control signal, export to next stage column electrode driving circuit 42, wherein, adopt column electrode scanning sequency external control signal TMY and column electrode scanning sequency internal control signal MY common mode control in the embodiment of the invention in order to control the scanning sequency of column electrode more neatly.Column electrode driving circuit 42 is under the control of clock and control signal, address signal is deciphered, and carry out the selection of voltage, export several column electrode signals, on the final man-to-man column electrode that is connected to LCDs of these column electrode signals, first scan control signal that produces according to column electrode control circuit 41 scans column electrode.Consider on the liquid crystal panel in the column electrode address and GDDRAM the corresponding relation between the row address of storage unit have positive and negative two kinds may, scanning sequency to the column electrode in the liquid crystal panel also has positive and negative two kinds, and for ICON being arranged and not having the occasion scan mode of ICON also inequality, concrete scanning sequency by column electrode control circuit 41 according to scan pattern signal MODE, column electrode scanning sequency external control signal TMY and column electrode scanning sequency internal control signal MY control column electrode driving circuit 42 and scan, to the judgement of the scan pattern of column electrode and scanning sequency as mentioned above, repeat no more during driving herein.
GDDRAM control circuit 43 produces scan clock signal, GDDRAM address signal and second scan control signal according to the scan pattern signal MODE that receives by built-in function, exports to GDDRAM 44.GDDRAM 44 is under the control of the clock and second scan control signal, address signal is deciphered and corresponding storage unit is scanned, data are read, deliver to column electrode drive circuit 45, wherein, for ICON being arranged and not having the occasion of ICON also inequality to the scan mode of storage unit among the GDDRAM 44, concrete scan mode is controlled according to scan pattern signal MODE by GDDRAM control circuit 43, repeats no more.
Column electrode drive circuit 45 will be converted into corresponding driving voltage from the view data that GDDRAM 44 reads, and with the man-to-man row electrode that exports LCDs to of these voltage signals, realize the demonstration of image.Wherein GDDRAM 44 is used to store the image data of needs.These data can be passed through outside MPU, externally write GDDRAM 44 under clock and the control signal, and GDDRAM control circuit 43 and column electrode control circuit 41 synchronous workings, mutual coordinate synchronization between the address signal that is produced, clock signal and the control signal.
In the embodiment of the invention, column electrode control circuit in the liquid crystal display drive unit and GDDRAM control circuit are judged in the current application system according to the scan pattern signal and are had or not ICON, again display panels is applied driving voltage with corresponding scan mode, various functions under two kinds of application scenarios are realized compatibility, thereby improved the applicability of liquid crystal display drive unit.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method for driving liquid crystal display is characterized in that, said method comprising the steps of:
Receive the scan pattern signal, judge in the current application system to have or not ICON;
In the current application system, during no ICON, the pixel of liquid crystal panel matrix area is lined by line scan, show;
When in the current application system, ICON being arranged, successively, show the pixel of liquid crystal panel matrix area and the picture element scan in ICON zone.
2. the method for claim 1, it is characterized in that, line by line scan or successively the pixel of liquid crystal panel matrix area and the pixel in ICON zone are scanned in described pixel to the liquid crystal panel matrix area, before the step that shows, described method further comprises:
Direction of scanning according to column electrode scanning sequency internal control signal and column electrode scanning sequency external control signal judgement column electrode.
3. the method for claim 1 is characterized in that, describedly during no ICON, the pixel of liquid crystal panel matrix area is lined by line scan in the current application system, and the step that shows is specially:
Determine the initial row that scans in the image data random access memory to begin the storage unit in the image data random access memory is scanned the reading displayed data with this initial row;
According to the described video data that reads the pixel of liquid crystal panel matrix area is carried out forward scan line by line or reverse scan,, show the charging of row electrode.
4. the method for claim 1 is characterized in that, described when in the current application system ICON being arranged, successively to the pixel of liquid crystal panel matrix area and the picture element scan in ICON zone, the step that shows is specially:
Determine to begin the initial row that scans in the image data random access memory storage unit corresponding with the liquid crystal panel matrix area to be scanned the reading displayed data with this initial row;
According to the video data of the liquid crystal panel matrix area that reads, the pixel of liquid crystal panel matrix area is carried out forward scan line by line or reverse scan, to the charging of row electrode, show;
Storage unit corresponding with liquid crystal panel ICON zone in the image data random access memory is scanned the reading displayed data;
According to the video data in the liquid crystal panel ICON zone of reading, the pixel in liquid crystal panel ICON zone is scanned, to the charging of row electrode, show.
5. a liquid crystal display drive unit is characterized in that, described device comprises:
The column electrode control circuit is used to receive scan pattern signal and column electrode scanning sequency signal, produces first scan control signal, and described first scan control signal comprises the scan control information that has or not ICON;
The column electrode driving circuit is used for according to described first scan control signal column electrode being scanned, and when described first scan control signal comprises the scan control information of no ICON, the pixel of liquid crystal panel matrix area is lined by line scan; When described first scan control signal includes the scan control information of ICON, successively the pixel of liquid crystal panel matrix area and the pixel in ICON zone are scanned, show;
The image data ram control circuit is used to receive the scan pattern signal, produces second scan control signal, and described second scan control signal comprises the scan control information that has or not ICON;
The image data random access memory, be used for scanning according to the video data of described second scan control signal to its storage inside, and data are read, when described second scan control signal comprises the scan control information of no ICON, each storage unit of its inside is lined by line scan; When described second scan control signal includes the scan control information of ICON, successively scan to the storage unit corresponding with the regional corresponding storage unit of ICON with the liquid crystal panel matrix area; And
Column electrode drive circuit, the data conversion that is used for reading from described image data random access memory is a corresponding driving voltage, and exports driving voltage to the row electrode.
6. device as claimed in claim 5 is characterized in that, described column electrode scanning sequency signal comprises column electrode scanning sequency internal control signal and column electrode scanning sequency external control signal.
7. as claim 5 or 6 described devices, it is characterized in that, when described second scan control signal comprises the scan control information of no ICON, described image data random access memory begins the storage unit the image data random access memory is scanned from initial row, the reading displayed data; Described column electrode driving circuit carries out forward scan line by line or reverse scan to the pixel of liquid crystal panel matrix area; Described column electrode drive circuit to the charging of row electrode, shows when described column electrode driving circuit scans the pixel of liquid crystal panel matrix area.
8. as claim 5 or 6 described devices, it is characterized in that, when described second scan control signal includes the scan control information of ICON, described image data random access memory successively scans the reading displayed data to the storage unit corresponding with the liquid crystal panel matrix area with the corresponding storage unit in ICON zone; Described column electrode driving circuit carries out forward scan line by line or reverse scan to the pixel of liquid crystal panel matrix area, and the pixel to the ICON zone scans again; Described column electrode drive circuit to the charging of row electrode, shows when described column electrode driving circuit scans the pixel in the pixel of liquid crystal panel matrix area and ICON zone.
9. a liquid crystal display comprises liquid crystal panel and liquid crystal display drive unit, it is characterized in that, described liquid crystal display drive unit comprises:
The column electrode control circuit is used to receive scan pattern signal and column electrode scanning sequency signal, produces first scan control signal, and described first scan control signal comprises the scan control information that has or not ICON;
The column electrode driving circuit is used for according to described first scan control signal column electrode being scanned, and when described first scan control signal comprises the scan control information of no ICON, the pixel of described liquid crystal panel matrix area is lined by line scan; When described first scan control signal includes the scan control information of ICON, successively the pixel of described liquid crystal panel matrix area and the pixel in ICON zone are scanned, show;
The image data ram control circuit is used to receive the scan pattern signal, produces second scan control signal, and described second scan control signal comprises the scan control information that has or not ICON;
The image data random access memory, be used for scanning according to the video data of described second scan control signal to its storage inside, and data are read, when described second scan control signal comprises the scan control information of no ICON, each storage unit of its inside is lined by line scan; When described second scan control signal includes the scan control information of ICON, successively scan to the storage unit corresponding with the corresponding storage unit in ICON zone with described liquid crystal panel matrix area; And
Column electrode drive circuit, the data conversion that is used for reading from described image data random access memory is a corresponding driving voltage, and exports driving voltage to the row electrode.
10. liquid crystal display as claimed in claim 9 is characterized in that, described column electrode scanning sequency signal comprises column electrode scanning sequency internal control signal and column electrode scanning sequency external control signal.
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| CN2007101256068A CN101471041B (en) | 2007-12-28 | 2007-12-28 | LCD driving method and apparatus and LCD equipment |
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| CN2007101256068A CN101471041B (en) | 2007-12-28 | 2007-12-28 | LCD driving method and apparatus and LCD equipment |
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| CN101471041A CN101471041A (en) | 2009-07-01 |
| CN101471041B true CN101471041B (en) | 2011-07-27 |
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| JP5649558B2 (en) * | 2011-12-13 | 2015-01-07 | 株式会社ジャパンディスプレイ | Liquid crystal display device, driving method thereof, and electronic apparatus |
| CN110827778B (en) * | 2019-10-25 | 2021-10-08 | 深圳市华星光电半导体显示技术有限公司 | Grid scanning driving circuit and display panel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1170186A (en) * | 1996-05-15 | 1998-01-14 | 摩托罗拉公司 | Liquid crystal display driver system and method therefor |
| US6104396A (en) * | 1992-04-17 | 2000-08-15 | Matsushita Graphic Communication Systems Inc. | Information processing system |
| CN1856048A (en) * | 2005-04-20 | 2006-11-01 | 三星电子株式会社 | Apparatus and method for displaying icons and controlling direct link menus in portable terminal |
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2007
- 2007-12-28 CN CN2007101256068A patent/CN101471041B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6104396A (en) * | 1992-04-17 | 2000-08-15 | Matsushita Graphic Communication Systems Inc. | Information processing system |
| CN1170186A (en) * | 1996-05-15 | 1998-01-14 | 摩托罗拉公司 | Liquid crystal display driver system and method therefor |
| CN1856048A (en) * | 2005-04-20 | 2006-11-01 | 三星电子株式会社 | Apparatus and method for displaying icons and controlling direct link menus in portable terminal |
Non-Patent Citations (2)
| Title |
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| JP特开平11-160683A 1999.06.18 |
| JP特开平9-54300A 1997.02.25 |
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Assignee: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. Assignor: BYD Co.,Ltd. Contract fulfillment period: 2008.4.25 to 2015.8.16 Contract record no.: 2008440000068 Denomination of invention: LCD driving method and apparatus and LCD equipment License type: General permission Record date: 20080504 |
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Effective date of registration: 20191230 Address after: 518119 1 Yanan Road, Kwai Chung street, Dapeng New District, Shenzhen, Guangdong Patentee after: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. Address before: 518119 BYD Industrial Park, Yanan Road, Kwai Chung Town, Longgang District, Guangdong, Shenzhen Patentee before: BYD Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: BYD Semiconductor Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110727 |