CN102402410A - Display device and control method thereof - Google Patents
Display device and control method thereof Download PDFInfo
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- CN102402410A CN102402410A CN2010102798785A CN201010279878A CN102402410A CN 102402410 A CN102402410 A CN 102402410A CN 2010102798785 A CN2010102798785 A CN 2010102798785A CN 201010279878 A CN201010279878 A CN 201010279878A CN 102402410 A CN102402410 A CN 102402410A
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Abstract
The invention relates to a display device. The display device comprises a host, a control unit and a display unit, wherein the control unit receives host data generated by the host to generate input data and comprises a first memory, a second memory, a third memory and an arbiter; the first memory stores the input data as first stored data; the second memory stores second stored data and outputs the second stored data to generate output data; the third memory stores third stored data; when the data quantity of the first stored data is greater than a first critical value, the arbiter performs write operation to write the first stored data in the third memory; when the data quantity of the second stored data is smaller than a second critical value, the arbiter performs read operation to read the third stored data and writes the third stored data in the second memory to obtain the second stored data; and the display unit displays an image according to the output data.
Description
Technical field
The present invention relates to a kind of display device, particularly relate to a kind of control method for controlling display device.
Background technology
(electro-phoretic display EPD) in the device, accomplishes at main frame and to transmit host data to control module, and said control module then transmits corresponding image data to display panel in the electrophoresis showed of prior art.Only after display panel is accomplished display operation according to the image data that transmits, main frame just can begin to transmit next host data about next image to control module.Therefore, when show image, the EPD device has lower operating efficiency.
Therefore, expectation provides control module to the EPD device, and when the display panel of EPD device during just at show image, said control device can receive host data from the main frame of EPD device.
Summary of the invention
The present invention provides a kind of display device, and it comprises main frame, control module and display unit.Main frame is in order to produce host data.Control module receives host data and produces the input data according to host data.Control module comprises first memory, second memory, the 3rd storer and moderator.First memory receives and stores the input data with as first storage data.Second memory stores second storage data and exports second storage data to produce output data.The 3rd memory storage the 3rd storage data.Moderator comes the 3rd storer is carried out write operation according to the data volume of first storage data in the first memory, perhaps comes the 3rd storer is carried out read operation according to the data volume of second storage data in the second memory.When the data volume of first storage data in the first memory during greater than first critical value, moderator is carried out write operation so that first storage data in the first memory is write to the 3rd storer, with as the 3rd storage data.When the data volume of second storage data in the second memory during less than second critical value, moderator is carried out read operation reading the 3rd storage data from the 3rd storer, and the 3rd storage data writes to second memory with as second storage data.Display unit then receives the output data from control module, and according to the output data show image.
The present invention also provides a kind of control method, in order to the control first memory.First memory stores first storage data with show image.This control method may further comprise the steps: judge whether first memory is carried out write operation or read operation; When first memory is carried out read operation, second storage data in the second memory is write to first memory with as first storage data; And when first memory is carried out read operation, read first storage data with show image from first memory.
Description of drawings
Fig. 1 representes the display device according to the embodiment of the invention;
The embodiment of control module in Fig. 2 presentation graphs 1; And
Fig. 3 representes according to the embodiment of the invention, is used for the control method of SDRAM in the control chart 1.
[main element symbol description]
Fig. 1:
1～display device; 10～main frame;
11～control module; 12～display unit;
DH～host data; DOUT～output data;
Fig. 2:
20～interface processor; 21,22～storer (SRAM);
23～storer (SDRAM);
24,25～controller; 26～moderator;
27～signal processor; 270～look-up table;
DIN～input data;
Fig. 3:
S30...S39～method step.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and conjunction with figs., elaborates as follows.
Fig. 1 representes the display device according to the embodiment of the invention.Consult Fig. 1, display device 1 comprises main frame 10, control module 11 and display unit 12.In one embodiment, display device 1 can be an electrophoretic display apparatus.Main frame 10 transmits host data DH to control module 11.Control module 11 produces output data DOUT according to host data DH, and said output data DOUT is sent to display unit 12 with show image.According to this embodiment, when control module 11 was just transmitting output data DOUT to display unit 12, main frame 10 can transmit host data DH simultaneously to control module 11.For instance, when control module 11 just transmitting the output data DOUT that joins with the current correction of image to display unit 12 when showing, main frame 10 can transmit host data DH with next correction of image simultaneously to control module 11.Therefore, main frame 10 can transmit the host data with next correction of image in time, and must not wait for that display unit 12 completion show current image.
Fig. 2 representes the control module 11 according to the embodiment of the invention.As shown in Figure 2, control module 11 comprises interface processor 20, storer 21,22, with 23, controller 24 and 25, moderator 26 and signal processor 27.In this embodiment; Storer 21 and 22 is with static RAM (Static Random Access Memory; SRAM) realize that (Synchronous Dynamic Random Access Memory SDRAM) realizes and storer 23 is with Synchronous Dynamic Random Access Memory.Controller 24 and 25 is used for controlling respectively SRAM 21 and 22.Moderator 26 is used for controlling SDRAM 23, and judges whether SDRAM 23 is carried out write operation or read operation.The input data DIN that SRAM 21 stores from interface processor 20.The data that SDRAM 23 stores from SRAM 21.22 storages of SRAM are from the data of SDRAM 23.The host data DH that interface processor 20 receives from main frame 10, and the clock zone (clock domain) of change host data DH.After the clock zone that changes host data DH was with synchronization, interface processor 20 produced input data DIN to controller 24.Controller 24 will write to SRAM 21 from the input data DIN of interface processor 20.
In this embodiment, controller 24 is also judged the data volume that is stored in SRAM 21.Judge when controller 24 be stored in SRAM 21 data volume greater than first critical value, controller 24 writes to moderator 26 from the SRAM21 reading of data and with the data of reading.Simultaneously, moderator 26 decisions are carried out write operation to SDRAM 23.Therefore, 26 couples of SDRAM of moderator 23 carry out the said write operation and write to SDRAM 23 with the data that will read from SRAM 21.
In this embodiment, controller 25 is also judged the data volume that is stored in SRAM 22.Controller 25 reads the data that are stored in SRAM 22 and exports it to signal processor 27.Signal processor 27 produces output data DOUT to display unit 12 according to the data from SRAM 22.The display panel of display unit 12 then comes show image according to this output data DOUT.In this embodiment, signal processor 27 comprises look-up table 270.Signal processor 27 is according to coming look-up table 270 is inquired about from the data of SRAM 22, to find out the represented corresponding GTG value of output signal DOUT.Judge the data volume that is stored in SRAM 22 during less than second critical value when controller 25, moderator 26 decisions are carried out read operations to SDRAM 23.Therefore, 26 couples of SDRAM of moderator 23 carry out said read operation, with from SDRAM 23 reading of data.At this moment, controller 25 receives the data of SDRAM 23 from moderator 26, and data are write to SRAM 22.
According to this embodiment, have two SRAM21 and 22.Therefore, when control module 11 will be sent to display unit 12 with the output data DOUT of the current correction of image when showing, main frame 10 can be sent to control module 11 with the host data DH with next correction of image, and this has increased the operating efficiency that shows the shadow item.
In this embodiment, storer 23 is realized with SDRAM.Therefore, moderator 26 also judges whether SDRAM 23 is carried out the renewal operation.When moderator 26 judged that operation is upgraded in 23 execution to SDRAM, 26 couples of SDRAM of moderator 23 carried out precharge (pre-charge) to upgrade SDRAM23, make the data of the former SDRAM of being stored in 23 be maintained.In certain embodiments, if storer 23 realize with other storage arrangement, can omit and judge whether to carry out the decision operation of upgrading operation and upgrade operation.
In addition, in certain embodiments, when moderator 23 was judged not to SDRAM 23 execution write operations, read operation and upgraded operation, moderator 23 control SDRAM 23 got into power-off (power-down) patterns with saving electric power.
Fig. 3 representes according to the embodiment of the invention, the control method of control SDRAM 23.At first, moderator 26 control SDRAM 23 enter to electric power starting (power-on) program (step S30).Behind the electric power starting of SDRAM 23, moderator 26 judges whether SDRAM 23 is carried out write operation, read operation or upgrades operation (step S31).Judge not can carry out write operation, read operation and upgrade operation SDRAM23 the time when moderator 26, moderator 26 control SDRAM 26 enter to the power-off pattern to save electric power (step S32).When SDRAM 23 wanted recovery operation, the method was then returned step S30, made SDRAM 23 get into electric power starting program (step S30) once more.
Consult Fig. 2 and Fig. 3; When moderator 26 is judged SDRAM 23 execution write operations in step S31; 26 couples of SDRAM of moderator 23 carry out precharge with renewal SDRAM 23 (step S33), and the column of memory cells (step S34) among the moderator 26 activation SDRAM 23.Then, moderator 26 reads the data that are stored in SRAM 21 through controller 24, and said data are write to SDRAM 23 (step S35).If need write to another column of memory cells of SDRAM23 from the data of SRAM 21, the method then is back to step S33, make next column of memory cells of the column of memory cells that moderator 26 activations have been enabled.When write operation was accomplished, the method then was back to step S32, and SDRAM 23 then enters to the power-off pattern.
Consult ground 2 and 3 figure; When moderator 26 is judged SDRAM 23 execution read operations in step S31; 26 couples of SDRAM of moderator 23 carry out precharge with renewal SDRAM 23 (step S36), and the column of memory cells (step S37) of moderator 26 activation SDRAM 23.Then, moderator is read 26 data (step S38) of getting on the column of memory cells that is enabled, and through controller 25 said data is write to SRAM 22.If the data on next column of memory cells of the column of memory cells that has been enabled also will write to SRAM 22, the method is back to step S36, makes next column of memory cells of the column of memory cells that moderator 26 activations have been enabled.When read operation was accomplished, the method was back to step S32, and SDRAM 23 then enters to the power-off pattern.
When moderator 26 was judged SDRAM 23 execution renewal operations in step S31,26 pairs of SDRAM 23 precharge of moderator made the data that are stored in SDRAM 23 be maintained to upgrade SDRAM 23 (step S39).When upgrading the operation completion, the method is then got back to step S32.
In this embodiment, the storer 23 of Fig. 2 is realized with SDRAM.Therefore need precharge step S33, S36 and S39.In certain embodiments, if storer 23 realize with other storage arrangement, then can omit precharge step S33, S36 and S39.In addition, in step S31, moderator 26 only need judge whether SDRAM 23 is carried out write operation or read operation, and does not comprise the renewal operation.
Though the present invention discloses as above with preferred embodiment; So it is not in order to limit scope of the present invention; Any those of ordinary skills; Do not breaking away from the spirit and scope of the present invention, when can making various modifications and modification, so protection scope of the present invention should be as the criterion with the scope of accompanying claims.
Claims (18)
1. display device comprises:
Main frame produces host data;
Control module receives said host data and produces the input data according to said host data, and wherein, said control module comprises:
First memory receives and stores said input data with as first storage data;
Second memory stores second storage data and exports said second storage data to produce output data;
The 3rd storer stores the 3rd storage data; And
Moderator; Come said the 3rd storer is carried out write operation according to the data volume of said first storage data in the said first memory, perhaps come said the 3rd storer is carried out read operation according to the data volume of said second storage data in the said second memory;
Wherein, When the data volume of said first storage data in the said first memory during greater than first critical value; Said moderator is carried out the said write operation so that said first storage data in the said first memory is write to said the 3rd storer, with as said the 3rd storage data; And
Wherein, When the data volume of said second storage data in the said second memory during less than second critical value; Said moderator is carried out said read operation reading said the 3rd storage data from said the 3rd storer, and said the 3rd storage data writes to said second memory with as said second storage data; And
Display unit receives the said output data from said control module, and according to said output data show image.
2. display device as claimed in claim 1, wherein, said control module also comprises:
First controller is controlled said first memory, and judges the data volume of said first storage data in the said first memory;
Wherein, said first controller receives said input data and said input data is write to said first memory with as said first storage data; And
Wherein, The data volume of judging said first storage data in the said first memory when said first controller is during greater than said first critical value, and said first controller reads said first storage data and exports said first storage data to said moderator from said first memory.
3. display device as claimed in claim 2, wherein, said control module also comprises:
Second controller is controlled said second memory, and judges the data volume of said second storage data in the said second memory;
Wherein, said second controller is exported said second storage data and is come show image for said display unit to produce said output data; And
Wherein, The data volume of judging said second storage data in the said second memory when said second controller is during less than said second critical value, and said second controller receives from said the 3rd storage data of said moderator and with said the 3rd storage data and writes to said second memory with as said second storage data.
4. display device as claimed in claim 1, wherein, said first memory is realized with static RAM.
5. display device as claimed in claim 1, wherein, said second memory is realized with static RAM.
6. display device as claimed in claim 1, wherein, said the 3rd storer is realized with Synchronous Dynamic Random Access Memory.
7. display device as claimed in claim 6, wherein, said moderator is also carried out said the 3rd storer and is upgraded operation.
8. display device as claimed in claim 6, wherein, when said moderator was not carried out said write operation, said read operation and said renewal operation, said moderator got into the power-off pattern.
9. display device as claimed in claim 1, wherein, when said moderator was not carried out said write operation and said read operation, said moderator got into the power-off pattern.
10. display device as claimed in claim 1, wherein, said control module also comprises:
Interface processor, the clock zone that receives said host data and change said host data is to produce said input data; And
Signal processor receives said second storage data from said second memory, and produces said output data according to said second storage data.
11. display device as claimed in claim 1, wherein, said display device is an electrophoretic display apparatus.
12. a control method, in order to the control first memory, said first memory stores first storage data with show image, and said control method comprises:
Judge whether said first memory is carried out write operation or read operation;
When said first memory is carried out said read operation, second storage data in the second memory is write to said first memory with as said first storage data; And
When said first memory is carried out said read operation, read said first storage data with show image from said first memory.
13. control method as claimed in claim 12; Wherein, Read said first storage data from said first memory and write to the 3rd storer with as the 3rd storage data, and said the 3rd storage data exports display unit to show image from said the 3rd storer.
14. control method as claimed in claim 12; Wherein, judge whether the step that said first memory is carried out said write operation or said read operation comprised and judge whether said first memory is carried out said write operation, said read operation or upgraded operation.
15. control method as claimed in claim 14 also comprises: when first memory not being carried out said write operation, said read operation and said renewal operation, control said first memory and get into the power-off pattern.
16. control method as claimed in claim 12 also comprises: when first memory not being carried out said write operation and said read operation, control said first memory and get into the power-off pattern.
17. control method as claimed in claim 12 wherein, writes to said first memory with said second storage data in the said second memory and comprises with the step as said first storage data:
The said first memory of precharge;
The column of memory cells of the said first memory of activation; And
Said second storage data is write to the said column of memory cells that is enabled of said first memory.
18. control method as claimed in claim 12; Wherein, Reading from said first memory in the step of said first storage data with show image; Said first memory is by precharge, and the column of memory cells of said first memory is enabled, and then first storage data on the said said column of memory cells that is enabled is read.
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| CN2010102798785A CN102402410A (en) | 2010-09-09 | 2010-09-09 | Display device and control method thereof |
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| CN2010102798785A CN102402410A (en) | 2010-09-09 | 2010-09-09 | Display device and control method thereof |
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- 2010-09-09 CN CN2010102798785A patent/CN102402410A/en active Pending
Patent Citations (8)
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| CN1099887A (en) * | 1993-05-13 | 1995-03-08 | 卡西欧计算机公司 | Display driving device |
| EP0935199A2 (en) * | 1998-02-04 | 1999-08-11 | Matsushita Electric Industrial Co., Ltd. | Memory control unit and memory control method and medium containing program for realizing the same |
| US20020057265A1 (en) * | 2000-10-26 | 2002-05-16 | Seiko Epson Corporation | Display driver, and display unit and electronic instrument using the same |
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Application publication date: 20120404 |