CN103208258B - Electrophoresis showed control method and device thereof - Google Patents
Electrophoresis showed control method and device thereof Download PDFInfo
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- CN103208258B CN103208258B CN201210183947.1A CN201210183947A CN103208258B CN 103208258 B CN103208258 B CN 103208258B CN 201210183947 A CN201210183947 A CN 201210183947A CN 103208258 B CN103208258 B CN 103208258B
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Abstract
The present invention relates to electrophoresis showed control method and device thereof, belong to electric light display technique field.Electrophoresis showed control method of the present invention comprises: according to the pixel data of the pixel data of current pixel point and the current pixel point of rear piece image that get front piece image and the frame number of this refresh operation determined, determine the magnitude of voltage that the current pixel point of image to be displayed is corresponding in this refresh operation; According to the magnitude of voltage determined, produce and output interface sequential.Electrophoresis showed control device of the present invention comprises: the first direct memory access dma controller, the second direct memory access dma controller, search module and timing sequencer.The invention solves electrophoresis showed control device in prior art needs larger RAM as the storage space of view data, and after getting all pixel datas of image, just need inquire about voltage table, then determine the technical matters of the magnitude of voltage that each pixel is corresponding.
Description
Technical field
The present invention relates to electric light display technique field, particularly electrophoresis showed control method and device thereof.
Background technology
Electrophoretic display technology (EPD), is also called " electrophoretic display device (EPD) ", is the display technique of class master mode display comparatively early development.EPD screen is made up of a lot of tiny capsules, and each capsule comprises positively charged white particles and electronegative black particles, and black particles and white particles are all suspended in clear liquid.When arranging negative pole electric field, white particle moves to microcapsules top, reader visible white particle, herein surf zone display white.Meanwhile, when arranging positive electric field, black particles moves to microcapsules top, and reader's visible black color particle, makes surf zone be shown as black.
Fig. 1 is the control device system architecture diagram of prior art EPD.As shown in Figure 1, EPD control chip 12 is independent of multimedia application processor (MultimediaApplicationProcessor, be called for short MAP) 11, connect EPD screen 13, need supporting random access memory (RandomAccessMemory, RAM) 15 and flash memory (Flash) 14.Its course of work is as follows: MAP11 starts image data transmission, respectively the pixel data of the pixel data of front piece image and rear piece image is sent to EPD control chip 12 respectively, EPD control chip 12 is written to the pixel number of this two width image certificate in RAM15 respectively, then from Flash14, read in corresponding voltage table (V-form).EPD control chip 12 reads the pixel number certificate of two width images from RAM15, and inquires about voltage table, thus obtains magnitude of voltage corresponding to each pixel, and sends to EPD screen 13 to refresh.
The shortcoming of prior art is, electrophoresis showed control device needs larger RAM as the storage space of view data, and the view data that will show only have by complete be written to RAM after, just start to read view data in RAM to refresh EPD screen.
Summary of the invention
The object of the invention is to solve RAM that in prior art, electrophoresis showed control device needs the are larger storage space as view data, and after getting all pixel datas of image, just need inquire about voltage table, then determine the technical matters of the magnitude of voltage that each pixel is corresponding.
For achieving the above object, on the one hand, the invention provides a kind of electrophoresis showed control method, the method comprises the following steps: the frame number determining this refresh operation; According to pixel data and the described frame number of the pixel data of current pixel point and the current pixel point of rear piece image that get front piece image, determine the magnitude of voltage that the current pixel point of image to be displayed is corresponding in this refresh operation; According to the magnitude of voltage determined, produce and output interface sequential.
On the other hand, the invention provides a kind of electrophoresis showed and control, this device comprises: the first direct memory access dma controller, for obtaining the pixel data of the current pixel point of front piece image; Second direct memory access dma controller, for obtaining the pixel data of the current pixel point of rear piece image; Frame number control module, for determining the frame number of this refresh operation; Searching module, for according to getting the pixel data of current pixel point of front piece image and the pixel data of the current pixel point of rear piece image and described frame number, determining the magnitude of voltage that each pixel of described image to be displayed is corresponding; Timing sequencer, for according to searching the magnitude of voltage that module determines, produces and output interface sequential.
The embodiment of the present invention is by the pixel data of the current pixel point of two width images before and after obtaining respectively and the frame number of this refresh operation determined, the magnitude of voltage that the current pixel point of image to be displayed is corresponding in this refresh operation can be determined, the scheme that visible this method provides just need not inquire about voltage table after getting all pixel datas of image, then the magnitude of voltage that each pixel is corresponding is determined, therefore the scheme that the embodiment of the present invention provides does not need larger RAM as the storage space of view data, just voltage table is inquired about after not needing all pixels of front and back two width image all to read.The scheme that the embodiment of the present invention provides solves electrophoresis showed control device in prior art needs larger RAM as the storage space of view data, and after all pixel datas getting front and back two width image, just need inquire about voltage table, then the technical matters of the magnitude of voltage that each pixel is corresponding is determined, achieve the Real-time Obtaining of image to be displayed pixel corresponding voltage value, thus improve the refresh rate of EPD screen.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of electrophoresis showed control device in prior art;
The electrophoresis showed control device structural drawing that Fig. 2 provides for the embodiment of the present invention;
The electrophoresis showed control method process flow diagram that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 is the electrophoresis showed control method process flow diagram of the embodiment of the present invention for particular display area;
The schematic diagram divided for particular display area that Fig. 5 provides for the embodiment of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Fig. 2 is embodiment of the present invention electrophoresis showed control device structural drawing.As shown in Figure 2, electrophoresis showed control device 20 connects system bus 10 and the EPD screen 30 of main frame.
Electrophoresis showed control device 20 comprises the DMA (DirectMemoryAccess connecting host system bus 10, direct memory access) moderator 21, the the first dma controller 22A be connected with DMA moderator 21 and the second dma controller 22B, the first data buffer 24 be connected with the first dma controller 22A, the second data buffer 25 be connected with the second dma controller 22B, what be connected with the first data buffer 24 and the second data buffer 25 searches module 23, with the frame number control module 26 of searching module 23 and being connected, with the display look-up table means 27 of searching module 23 and being connected, the 3rd data buffer 28 be connected with display look-up table means 27, and the timing sequencer 29 to be connected with the 3rd data buffer 28, timing sequencer 29 connects EPD screen 30.
DMA moderator 21 according to the request of the first dma controller 22A and the second dma controller 22B for it provides the access right of system bus 10.DMA moderator 21 provides the access right of system bus 10 with polling mode according to the request of the first dma controller 22A and the second dma controller 22B.It should be noted that, DMA moderator 21 can also adopt other modes beyond polling mode to provide the access right of system bus 10 for the first dma controller 22A and the second dma controller 22B, and this is appreciated that to those skilled in the art and realizes.
First dma controller 22A for obtaining the pixel data of the current pixel point of front piece image, and is stored in the first data buffer 24; Second dma controller 22B for obtaining the pixel data of the current pixel point of rear piece image, and is stored in the second data buffer 25.
Frame number control module 26 is for determining the frame number of this refresh operation.EPD screen 30 could show image to be displayed completely in order to show once after complete image to be displayed needs refresh each pixel of multiframe image to be displayed continuously, and need the number of the frame refreshed to pre-determine, and the refresh operation that available corresponding frame number is corresponding each.When this refresh operation is first time refresh operation, this frame number is the start frame sequence number pre-set, and start frame sequence number is the first frame in frame number; When this refresh operation is not first time refresh operation, on completing once after refresh operation, the value of the frame number of last refresh operation is added 1, and will the frame number of the frame number after adding 1 operation as this refresh operation be completed.
In one example in which, one width image to be displayed just can by its complete showing after needing to be refreshed 16 frames, then its frame number comprises frame 0 to frame 15, initial frame number during first time refresh operation is 0, the value of the frame number of last refresh operation is needed to add 1 after often carrying out a refresh operation, therefore, when carrying out second time refresh operation, frame number then becomes 1.
The pixel data searching the current pixel point of the rear piece image that module 23 gets for the pixel data and the second dma controller 22B getting the current pixel point of front piece image according to the first dma controller 22A and the frame number of this refresh operation determined, determine the magnitude of voltage that each pixel of image to be displayed is corresponding.
Particularly, search module 23 and first form an index value according to the current pixel point data of front piece image and the current pixel point data of rear piece image, by the display look-up table (LookUpTable that this index value determination image to be displayed is corresponding, be called for short LUT), LUT is the mapping table of a grey scale pixel value, be can show the actual temperature value of image pixel according to EPD screen and refresh mode is determined, this LUT is loaded previously in display look-up table means 27; The frame number searching this refresh operation that module 23 is determined according to frame number control module 26 again searches LUT, obtain the magnitude of voltage that image to be displayed current pixel point is corresponding in this refresh operation, and magnitude of voltage corresponding for the image to be displayed current pixel point of acquisition is stored in the 3rd data buffer 28.
Search module 23 after the magnitude of voltage of current pixel point having obtained image to be displayed, using the current pixel point of the next pixel of front piece image as front piece image; Using the current pixel point of the next pixel of rear piece image as rear piece image, and the magnitude of voltage obtaining the new current pixel point of image to be displayed is stored in the 3rd data buffer 28.
Timing sequencer 29, for reading by the magnitude of voltage searched module 23 and determine from the 3rd data buffer 28, produces interface sequence, and this interface sequence is outputted to EPD screen 30 and carry out image refreshing.Timing sequencer 29 can support the output of multiple control signal, according to the demand of different model EPD screen, can carry out corresponding voltage configuration to control signal, so that EPD screen 30 can normally receive the interface sequence produced by this timing sequencer 29.
Embodiment of the present invention electrophoresis showed control device also comprises judge module (not shown), this judge module, for judging whether the current pixel point of front piece image and rear piece image is positioned at particular display area, namely needs the one piece of viewing area be refreshed in image to be displayed.When before judge module judges, the current pixel point of piece image is positioned at particular display area, then the pixel data of the current pixel point of piece image before being obtained by the first dma controller 22A, be stored in the first data buffer 24; When after judge module judges, the current pixel point of piece image is positioned at particular display area, then the pixel data of the current pixel point of piece image after being obtained by the second dma controller 22B, be stored in the second data buffer 25.Search the frame number of module 23 according to this refresh operation determined when pixel and frame number control module 26 of the front piece image got and rear piece image, determine the magnitude of voltage that current pixel point in the particular display area of image to be displayed is corresponding.Timing sequencer 29, according to the magnitude of voltage searched module 23 and determine, produces interface sequence, and this interface sequence is outputted to EPD screen 30 and carry out image refreshing.
The first data buffer 24, second data buffer 25 in the embodiment of the present invention and the 3rd data buffer 28 can adopt first-in first-out (FirstInputFirstOutput, FIFO) data buffer, data fifo buffer can write view data in order, and sense data in order, to guarantee when carrying out read operation to data buffer, the data be first written in data buffer storage can first be read out.It should be noted that, according to the embodiment of the present invention, the data buffer of other types can also be adopted also can to reach same effect, this is be appreciated that and realize to those skilled in the art.
The pixel data of the current pixel point of piece image and the pixel data of the current pixel point of piece image and the frame number of this refresh operation determined after being obtained by the second dma controller 22B before the electrophoresis showed control device that the embodiment of the present invention provides is obtained by the first dma controller 22A, the magnitude of voltage that image to be displayed current pixel point is corresponding can be determined, solving electrophoresis showed control device in prior art needs larger RAM as the storage space of view data, and after the pixel data of all pixels getting front and back two width image, just need inquire about voltage table, then the technical matters of the magnitude of voltage that each pixel is corresponding is determined, achieve the Real-time Obtaining of image to be displayed pixel corresponding voltage value, thus improve the refresh rate of EPD screen.
Fig. 3 is embodiment of the present invention electrophoresis showed control method process flow diagram.Existing composition graphs 2 and Fig. 3 describe the control method of electrophoresis showed, the method comprising the steps of 301-303.
In step 301, obtain the pixel data of the pixel data of the current pixel point of front piece image and the current pixel point of rear piece image.
Particularly, the pixel data of the current pixel point of piece image before electrophoresis showed control device is obtained by the first dma controller, the pixel data of the current pixel point of piece image after being obtained by the second dma controller.The pixel data of the current pixel point of piece image and the pixel data by the current pixel point of piece image after the first dma controller acquisition before equally also can being obtained by the second dma controller.
In step 302, according to the pixel data of the pixel data of current pixel point and the current pixel point of rear piece image that get front piece image and the frame number of this refresh operation determined, determine the magnitude of voltage that the current pixel point of image to be displayed is corresponding in this operation.
Particularly, electrophoresis showed control device forms an index value according to the current pixel point data of front piece image and the current pixel point data of rear piece image, by the LUT that this index value determination image to be displayed is corresponding, then the magnitude of voltage corresponding in this refresh operation according to the frame number determination image to be displayed current pixel point of this refresh operation.It should be noted that, the refresh operation that frame number is corresponding each, when this refresh operation is first time refresh operation, this frame number is the start frame sequence number pre-set, and start frame sequence number is the first frame in frame number; When this refresh operation is not first time refresh operation, on completing once after refresh operation, the value of the frame number of last refresh operation is added 1, and will the frame number of the frame number after adding 1 operation as this refresh operation be completed.
In one example in which, as shown in table 1 (display look-up table LUT example), when the frame number of this refresh operation is frame 0, the magnitude of voltage that then image to be displayed current pixel point is corresponding is 0V, when the frame number of this refresh operation is frame 1, then the magnitude of voltage that image to be displayed current pixel point is corresponding becomes+15V.
Table 1
| Frame number | Magnitude of voltage |
| Frame 0 | 0V |
| Frame 1 | +15v |
| Frame 2 | +15v |
| Frame 3 | +15v |
| Frame 4 | +15v |
| Frame 5 | +15v |
| Frame 6 | 0V |
| Frame 7 | -15v |
| Frame 8 | +15v |
| Frame 9 | +15v |
| Frame 10 | +15v |
| Frame 11 | +15v |
| Frame 12 | +15v |
| Frame 13 | +15v |
| Frame 14 | +15v |
| Frame 15 | 0V |
Electrophoresis showed control device after the magnitude of voltage of current pixel point having obtained image to be displayed, using the current pixel point of the next pixel of front piece image as front piece image; Using the current pixel point of the next pixel of rear piece image as rear piece image, and obtain the magnitude of voltage of new current pixel point.
In step 303, according to the magnitude of voltage determined, produce and output interface sequential.
Particularly, the magnitude of voltage that electrophoresis showed control device is corresponding in this refresh operation according to the current pixel point of the image to be displayed determined in step 302, produces interface sequence, and this interface sequence is outputted to external EPD screen and carry out image refreshing.
The electrophoresis showed control method that the embodiment of the present invention provides is by the pixel data that gets the current pixel point of front piece image and the pixel data of the current pixel point of rear piece image got and the frame number of this refresh operation determined, the magnitude of voltage that image to be displayed current pixel point is corresponding can be determined, solve after electrophoresis showed control device in prior art needs to get the pixel data of all pixels of front and back two width image and just inquire about voltage table, then the technical matters of the magnitude of voltage that each pixel is corresponding is determined, achieve the Real-time Obtaining of the pixel corresponding voltage value of image to be displayed, thus improve the refresh rate of EPD screen.
Fig. 4 is the electrophoresis showed control method process flow diagram of the embodiment of the present invention for particular display area.As shown in Figure 4, the method comprising the steps of 401-403.
In step 401, obtain the pixel data of the current pixel point of two width images before and after in particular display area.
Particularly, electrophoresis showed control device, before the current pixel point pixel data of the front piece image of acquisition and rear piece image, first judges whether the current pixel point of front piece image and rear piece image is positioned at particular display area.When the current pixel point of current piece image is positioned at particular display area, the pixel data of the current pixel point of piece image before obtaining; When the current pixel point of rear piece image is positioned at particular display area, the pixel data of the current pixel point of piece image after obtaining.
Electrophoresis showed control device, after the pixel data of current pixel point having obtained front piece image and rear piece image in particular display area, judges whether the next pixel of front piece image and rear piece image is positioned at particular display area further.When the next pixel of current piece image is positioned at particular display area, the pixel data of the next pixel of piece image before obtaining; When the current pixel point of rear piece image is positioned at particular display area, the pixel data of the next pixel of piece image after obtaining.
In step 402, determine the magnitude of voltage that current pixel point in the particular display area of image to be displayed is corresponding.
Particularly, electrophoresis showed control device forms an index value according to the current pixel point data of piece image front in the particular display area got and rear piece image, by the LUT that this index value determination image to be displayed is corresponding, search LUT according to the frame number of this refresh operation again, determine the magnitude of voltage of the current pixel point correspondence in this refresh operation in the particular display area of image to be displayed.
After the magnitude of voltage of the current pixel point of electrophoresis showed control device in the particular display area having obtained image to be displayed, the current pixel point of next pixel as front piece image of piece image before particular display area will be positioned at, to the current pixel point of next pixel as rear piece image of the rear piece image of particular display area be positioned at, and obtain the magnitude of voltage of current pixel point new in the particular display area of image to be displayed.
In step 403, according to the magnitude of voltage determined, produce and output interface sequential.
Particularly, the magnitude of voltage that electrophoresis showed control device is corresponding according to the current pixel point in the particular display area of the image to be displayed determined in step 402, produces interface sequence, and this interface sequence is outputted to external EPD screen and carry out image refreshing.
In one example in which, the viewing area of EPD screen is divided into N block by electrophoresis showed control device in advance, and as shown in Figure 5, size and the initial position in N block region can pre-set.Such as N=8, region 7 is content display region, and other regions are menu function viewing area.Electrophoresis showed control device allows only to refresh the particular display area of specifying, i.e. content display region or menu function viewing area.For certain particular display area of EPD screen, electrophoresis showed control device only needs the pixel data obtaining the front piece image in particular display area and the pixel in rear piece image particular display area, does not need the pixel data of the pixel obtained in other nonspecific viewing areas.Such as, when carrying out page turning, the content of content display region 7 is only had to convert, the magnitude of voltage that the pixel data that electrophoresis showed control device then only need obtain the current pixel point in the particular display area (i.e. content display region 7) of front piece image and rear piece image is corresponding with the current pixel point of the frame number determination particular display area of this refresh operation determined, after the magnitude of voltage of the current pixel point in particular display area is acquired, produce interface sequence, and this interface sequence is outputted to external EPD screen and carry out image refreshing.
In sum, the electrophoresis showed control method that the embodiment of the present invention provides and device thereof are by the pixel data of the current pixel point of two width images before and after obtaining respectively and the frame number of this refresh operation determined, the magnitude of voltage that the current pixel point of image to be displayed is corresponding in this refresh operation can be determined, therefore the scheme that the embodiment of the present invention provides does not need larger RAM as the storage space of view data, just inquires about voltage table after not needing all pixels of front and back two width image all to read.Solving electrophoresis showed control device in prior art needs larger RAM as the storage space of view data, and after all pixel datas getting front and back two width image, just need inquire about voltage table, then the technical matters of the magnitude of voltage that each pixel is corresponding is determined, achieve the Real-time Obtaining of magnitude of voltage corresponding to image to be displayed pixel, thus improve the refresh rate of EPD screen.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. an electrophoresis showed control method, is characterized in that, described method comprises:
Determine the frame number of this refresh operation;
According to pixel data and the described frame number of the pixel data of current pixel point and the current pixel point of rear piece image that get front piece image, determine the magnitude of voltage that the current pixel point of image to be displayed is corresponding in this refresh operation;
Describedly determine that the magnitude of voltage corresponding in this refresh operation of the current pixel point of image to be displayed comprises: after the magnitude of voltage of current pixel point having obtained described image to be displayed, using the current pixel point of the next pixel of front piece image as front piece image; Using the current pixel point of the next pixel of rear piece image as rear piece image, and obtain the magnitude of voltage of new current pixel point;
According to the magnitude of voltage determined, produce and output interface sequential.
2. the method for claim 1, is characterized in that, describedly determines that the frame number of this refresh operation comprises:
If when this refresh operation is first time refresh operation, described frame number is the start frame sequence number pre-set;
If when this refresh operation is not first time refresh operation, on completing once after refresh operation, the value of the frame number of last refresh operation is added 1, and will the frame number of the frame number after adding 1 operation as this refresh operation be completed.
3. the method for claim 1, is characterized in that, describedly determines that the operation of magnitude of voltage comprises:
Pixel data according to the pixel data of front piece image current pixel point and the current pixel point of rear piece image determines the display look-up table LUT corresponding with described image to be displayed;
The magnitude of voltage corresponding in this refresh operation according to the current pixel point of described LUT and described frame number determination image to be displayed.
4. the method for claim 1, is characterized in that, before acquisition pixel data, comprises further:
Judge whether the current pixel point of front piece image and rear piece image is positioned at particular display area;
The pixel data of the pixel data of the current pixel point of the front piece image of described acquisition and the current pixel point of rear piece image comprises:
When the current pixel point of current piece image is positioned at particular display area, the pixel data of the current pixel point of piece image before obtaining; When the current pixel point of rear piece image is positioned at particular display area, the pixel data of the current pixel point of piece image after obtaining;
Describedly determine that the magnitude of voltage corresponding in this refresh operation of the current pixel point of image to be displayed comprises:
Determine the magnitude of voltage of the current pixel point correspondence in this refresh operation in the particular display area of image to be displayed.
5. an electrophoresis showed control device, is characterized in that comprising:
First direct memory access dma controller, for obtaining the pixel data of the current pixel point of front piece image;
Second direct memory access dma controller, for obtaining the pixel data of the current pixel point of rear piece image;
Frame number control module, for determining the frame number of this refresh operation;
Searching module, for according to getting the pixel data of current pixel point of front piece image and the pixel data of the current pixel point of rear piece image and described frame number, determining the magnitude of voltage that image to be displayed current pixel point is corresponding;
Described search module specifically for: after the magnitude of voltage of current pixel point having obtained described image to be displayed, using the current pixel point of the next pixel of front piece image as front piece image; Using the current pixel point of the next pixel of rear piece image as rear piece image, and obtain the magnitude of voltage of new current pixel point;
Timing sequencer, for searching the magnitude of voltage that module is determined described in basis, produces and output interface sequential.
6. device as claimed in claim 5, is characterized in that, described frame number control module specifically for:
If when this refresh operation is first time refresh operation, described frame number is the start frame sequence number pre-set;
If when this refresh operation is not first time refresh operation, on completing once after refresh operation, the value of the frame number of last refresh operation is added 1, and will the frame number of the frame number after adding 1 operation as this refresh operation be completed.
7. device as claimed in claim 5, is characterized in that, described in search module specifically for:
Pixel data according to the pixel data of front piece image current pixel point and the current pixel point of rear piece image determines the display look-up table LUT corresponding with described image to be displayed;
The magnitude of voltage corresponding in this refresh operation according to the current pixel point of described LUT and described frame number determination image to be displayed.
8. device as claimed in claim 5, is characterized in that, also comprise:
Judge module, for judging whether the current pixel point of front piece image and rear piece image is positioned at particular display area;
Described first direct memory access dma controller specifically for, when described judge module determines that the current pixel point of front piece image is positioned at particular display area, the pixel data of current pixel point of piece image before obtaining;
Described second direct memory access dma controller specifically for, when described judge module determines that the current pixel point of front piece image is positioned at particular display area, the pixel data of current pixel point of piece image after obtaining;
Describedly search module, also for determining the magnitude of voltage that current pixel point in the particular display area of image to be displayed is corresponding in this refresh operation.
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