CN1875397A - Electrophoretic display with compressed memory data - Google Patents

Electrophoretic display with compressed memory data Download PDF

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Publication number
CN1875397A
CN1875397A CNA2004800324325A CN200480032432A CN1875397A CN 1875397 A CN1875397 A CN 1875397A CN A2004800324325 A CNA2004800324325 A CN A2004800324325A CN 200480032432 A CN200480032432 A CN 200480032432A CN 1875397 A CN1875397 A CN 1875397A
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image information
look
epd
display device
frame
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Chinese (zh)
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M·J·J·亚克
G·周
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3433Control 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
    • G09G3/344Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0285Improving the quality of display appearance using tables for spatial correction of display data
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00Aspects of display data processing
    • G09G2340/02Handling of images in compressed format, e.g. JPEG, MPEG
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00Aspects of display data processing
    • G09G2340/16Determination of a pixel data signal depending on the signal applied in the previous frame

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

A display device (1) is provided for improving storage density. The display device (11) is comprised of compression means (3) for temporarily compressing incoming image information data and decompression means (5) for decompressing the temporarily compressed data, in a reverse operation. By compressing the incoming image data for some number of frames, improved storage density is achieved. In this manner, the number of frames of image information available to be used in generating waveform and time parameters to effect a change of the display elements (18) from a current optical state to a predetermined next optical state is increased thus providing more accurate gray scale reproduction.

Description

Electrophoretic display device (EPD) with memory data of compression
The present invention relates to bistable display, relate to the method and apparatus of the storage density that is used for improving the data of using at such display particularly.
The electrophoretic display device (EPD) that this display device is for example used in monitor, notebook computer, PDA(Personal Digital Assistant), mobile phone and e-book, newspaper, magazine or the like typically.
Electrophoretic display device (EPD) comprises: electrophoretic media (electric ink), and the latter is included in the charged particle in the fluid; Be aligned to a plurality of display units (pixel) of matrix; First and second electrodes related with each pixel; And voltage driver, be used to apply the electrode of potential difference (PD) to each pixel, make charged particle occupy a position between the electrode, so that display image or out of Memory according to the numerical value of the potential difference (PD) that adds and duration.
This display of mentioning in opening paragraph is for example from announcement on April 9th, 1999, E Ink Co. (electric ink company), Cambridge, Massachusetts, US, exercise question for " Full Color Reflective Display With Multichromatic Sub-Pixels " (panchromatic reflective display) with polychrome sub-pixel, International Patent Application WO 99/53373WO knows.This patented claim discloses the display that comprises two substrates, and one of them substrate is transparent.Another substrate is equipped with the electrode that is arranged in rows and columns.Point of crossing between column electrode and row electrode is related with display unit or pixel.Display unit is coupled to the row electrode via thin film transistor (TFT) (TFT), and transistorized grid is coupled to column electrode.Display unit, TFT transistor and row form active matrix with this arrangement of row electrode.And display unit comprises pixel electrode.Line driver is selected the row of display unit, and row driver is provided to data-signal via row electrode and TFT transistor the row of choosing of display unit.Data-signal is corresponding to the graph data that will be shown.
In addition, electric ink is provided between the transparent on-chip pixel electrode and public electrode.Electric ink comprises that diameter is about a plurality of microcapsules of 10 to 50 microns.Each annular seal space has white particles and the electronegative black particles that is suspended in the positively charged in the fluid.When negative electric field was added to public electrode, white particles moved to a side of the sensing transparent substrate of microcapsule, and display unit becomes that spectators can see.Simultaneously, black particles moves to the pixel electrode at an opposite side place of microcapsule, and like this, black particles is hidden for spectators.By negative electric field is added to pixel electrode, black particles moves to the public electrode at a side place of the sensing transparent substrate of microcapsule, and spectators' display unit is presented black.When electric field was removed, display device remained on the state that has obtained, therefore presented bistable characteristic.
Development nearest in the electrophoretic display technology is concentrating on to improve the storage density of the data of using, so that reach accurate gray-scale rendition in such display.Gray scale in display image can generate by the number of particles that control moves at the counter electrode at microcapsule top.For example, thus the energy ` of positive electric field or negative electric field is defined as the product of field intensity and application time--the optical states that the particle weight of controlling the top that moves to microcapsule makes display unit become to want.Yet, should see that these displays are influenced by horizontal heterogeneity of image history, dead time, temperature, humidity, electrophoretic film or the like consumingly, all these pull together to impel display unit to become certain state different with the optical states of wanting.Particularly, in order to compensate these and other factors and make display unit change to the optical states of wanting, need matrix look-up table (LUT) or transition matrix.This matrix respectively has one dimension for the final state of wanting and each other state (initial with any original state).Depend on the number (this number changes with driving method) of the previous state that will consider, employed look-up table (LUT) can become very big.Getting egregious cases is example, consider to use the algorithm of taking into account initial, last and two original states for 256 (2 8) processing procedure of individual gray level electrophoretic display.Required four-dimensional look-up table (LUT) has 2 32.If each needs 64 bit (8 byte), then total size of LUT approximately is the 32G byte.And, if LUT needs temperature compensation, then needing to generate and store look-up table (LUT) to different temperatures, these temperature are determined in advance, measure and be stored in the display controller neutralization usually and are stored in the external memory storage.
The purpose of this invention is to provide a kind of display that has overcome the storage limitations of prior art.
Another object of the present invention provides the display that has improved data storage density.
A further object of the present invention provides the display that the data storage density improved is reappeared with the accurate greyscale of one or more standing states of allowing consideration equipment.
Another object of the present invention provides the data storage density improved so that the display that allows accurate greyscale to reappear by compensation transformation temperature in the very big temperature range.
These and other objects are to comprise that by providing a kind of being used for the interim display that compresses the compression set of the image information that enters reaches by the present invention.This display also comprises decompressing device, is used for the data temporarily compressed with opposite operation decompress(ion), to generate necessary driving parameters.Display also comprises controller, (for example be used for according to the image information of the decompression of reception in image information that receives at current frame (N) and the frame before at least one (N-1), the embodiment that replaces can consider two or more frames in the past, N-2, N-3 or the like), and uses this waveform and time parameter is implemented display unit changes to predetermined next optical states from current optical states change from look-up table retrieval waveform and time parameter.
According to one aspect of the present invention, the compression set that the present invention uses can be any known harmless or lossy compression method algorithm.According to another aspect of the present invention, compression/decompression processes is carried out in a period of time, during this period of time with respect to for to be created on the needed time of driving parameters necessary in each frame be footy.
To understand above-mentioned characteristic of the present invention easilier with reference to the following detailed description of illustrative embodiment of the present invention in conjunction with the drawings, on the figure:
Fig. 1 shows the electrophoretic display device (EPD) 1 according to the first embodiment of the present invention; And
Fig. 2 shows the electrophoretic display device (EPD) 1 according to the second embodiment of the present invention.
In the following explanation of embodiments of the invention,, shown as an illustration wherein on the figure and can implement specific embodiment of the present invention with reference to the accompanying drawing that forms a part of the present invention.Should see, can utilize other embodiment, and can make the change of structure and do not deviate from the scope of the embodiment of description of the invention.
Definition
Term " gray states " or " gray scale " are used for the middle state of two extreme optical state of remarked pixel here with its traditional sense in imaging technique, might not be meant the black and white conversion between these two extremities.For example, electrophoretic display device (EPD) has been described in the application of several patents cited below and announcement, and wherein extremity is white and mazarine, and like this, middle gray states is actually light blue.In fact, as mentioned above, the conversion between two extremities can not be colored the variation fully.
Term " bistable state " and " bistability " are used to represent to comprise the display of the display unit with first and second show states here with its traditional sense in imaging technique, these two kinds of show states have a different optical characteristics at least, make and drive any given unit so that after it is presented in its first or second show state in addressing pulse by means of finite duration, this state will continue for some time after addressing pulse finishes, during this period of time at least several times (for example at least four times) in the minimum duration of the needed addressing pulse of state that is used for changing display unit., co-pending patent application serial number No.10/063 that submit on April 2nd, 2002, show in 236 (also can consult corresponding international application published No.WO02/079869), some that can display gray scale based on the electrophoretic display device (EPD) of particle not only under their extreme black and white state be stable, and also be stable under their Intermediate grey states, and the electrical-optical display of some other type also has same situation.This display correctly should be called " multistable " rather than bistable state, yet for convenience's sake, term " bistable state " can be used to cover bistable state and multistable display here.
Following discussion concentrates on one or more pixels of just carrying out gradation conversion of electrophoretic display device (EPD), promptly changes to another grey level from a grey level, changes to " at last " state from " initially " state.Obviously, original state and final state only are for the conversion of considering at specific time point place and like this appointments, and should see that pixel had been carried out conversion before " initially " state, and also will change later at " at last " state again.
Must distinguish under the situation of a plurality of original states, term " first original state " will be used to refer to there was one (non-zero) conversion in wherein relevant pixel before original state state, term " second original state " will be used to refer to there was one (non-zero) conversion in wherein relevant pixel before first original state state, or the like.
Summary
As mentioned above, bistable display approximate is worked by the pulse transducer down first, and like this, the final state of pixel does not singly depend on the time that electric field and electric field applied that is applied, and depends on and applying the state of electric field with preceding pixel.At the state that applies the pixel before the electric field now is the result of the image history of pixel, and it is defined as total energy (or stress) of being stood by each pixel, i.e. voltage * time in this time history.
Know as display technology personnel, image information is with series of frames, and promptly 1,2 ..., N-1, N, N+1, N+2 or the like is provided to electrophoretic display device (EPD).In each frame, for each display unit generation driving parameters (voltage * time) of display.Driving parameters partly is to be determined according to the image information that provides in current frame N (being current state) with for the image history of the original state of certain number of unit.In one embodiment, image information is considered according to a current state (frame N) and an original state (frame N-1), realizes the change of display unit from current optical states to predetermined next optical states so that generate necessary driving parameters.
Usually, well-known, bistable display has very strong image history, and therefore, accurate gray-scale rendition need be from the data of original state as much as possible.And, when display will compensate temperature, the requirement of data is increased in proportion.As an example,, need to surpass 200 temperature compensation look-up tables in-22 ℃ to+80 ℃ temperature range, adjusting display with 1/2 degree resolution.So, can see, the requirement of data is being reduced to propose great challenge aspect memory requirement and the display cost.
Knowledge is well-known as a setting, has many different data compression techniques in the prior art.Compress technique can be divided into two big classes: lossy coding and lossless coding.
Lossless compressiong packed data and do not have loss of data like this, can revert to original data to the data of compression, but the compressibility of lossless compression algorithm has a limit.Therefore, lossless compression algorithm is applied to condensed document file and program file (for example, Huffman coding, run length coding, LZW or the like) usually.
On the contrary, lossy compression is by the deletion data of pith relatively not too, reduces the scale of data thus and packed data.Therefore, the compressibility of lossy compression method algorithm is much bigger compared with the compressibility of lossless compression algorithm, but can not ideally revert to original data to the data of compression.Therefore, the lossy compression method algorithm is applied to compressed audio and video file (for example, JPEG, MPEG or the like) usually.
Except the compression scheme of knowing, the present invention also plans to use the scalable image compression algorithm based on the low-complexity of 8 * 8 discrete cosine transforms (DCT).Different with traditional DCT compression algorithm, the scalable image compression algorithm of low-complexity does not use additional quantization or entropy.Algorithm more comprehensively discusses hereto, can consult Rene J.van der Vleuten, Richard P.Kleihorst, " Low-Complexity Scalable Image Compression " (the scalable compression of images of low-complexity), this article is being hereby incorporated by reference.
First embodiment
Fig. 1 shows the electrophoretic display device (EPD) 1 according to the first embodiment of the present invention.The display 1 of Fig. 1 comprises frame memory 9, compression unit 3, decompression unit 5, display controller 7, the storer that is used for store look-up tables 12, temperature sensor 13 and comprises the display 18 of a plurality of Electronphoretic display units.Display 1 is carried out the real time data compression/de-compression when receiving image information (frame data), just as will be described.
By continuing with reference to figure 1, when operation, image information (data) is with a series of frames in succession, and promptly 1,2 ..., N-1, N, N+1, N+2... etc. are provided to electrophoretic display device (EPD) 1 in the time period in succession.For example, the frame data of N-1 frame are in time T -1Be received with processed; With in succession order, the frame data of N frame are in time T then 0Be received with processed; The frame data of N+1 frame are in time T + 1Be received with processed; Or the like.
For convenience of explanation, will be described in greater detail in time T 0The processing procedure of beginning, at this time point, the N frame data are received and are handled by electrophoretic display apparatus 1 at input node 2 places.
In time T 0, the frame data relevant with present frame (being called the N frame data here) are received at input node 2 places of display device 1.The N frame data are simultaneously processed in two ways basically.At first, the N frame data are provided to compression unit 5 under the control of display controller 7.Compression unit 5 is handled the N frame data, and exports the N frame data that will be stored in the compression in the frame memory 9 under the control of display controller 7.
Second, with the compression and store the N frame data basically side by side, display controller 7 also is arranged to use the N frame data, and the data corresponding at least one original state generate driving parameters 20, to realize the change of display unit from current optical states (first gray scale or value of color) to predetermined next optical states (second gray scale or value of color).
In one embodiment, according to current N frame data and previous state (be former frame--be time T -1) (N-1) frame data of receiving, obtain necessary driving parameters 20.Should be understood that, in order to utilize (N-1) frame data, at first must be from storer 9 these data of retrieval, these data are to be stored in the storer 9 with the form of compressing in the previous former time period, and are decompressed by decompression unit 5 under the control of display controller 7.
As mentioned above, in this exemplary embodiment, display controller 7 is arranged to according to the image information that receives in current frame, the N frame data, with frame data (image information) corresponding to the storage of former state, (N-1) frame data generate the driving parameters (waveform and time parameter) that is used for display unit 18.Each state is corresponding to the number of one 4 bit, and it is corresponding to 16 rank gray scales.These bits form 8 bit term among the LUT 12 together.Preferably, LUT 12 has the address entries corresponding to the current state of state before at least one of display unit and display unit.
It will be appreciated that, in the embodiment that replaces, can generate waveform and time parameter according to additional previous state.For example, can be according in time T 0N frame data and two previous states of receiving are promptly in time T -1And T -2(N-1) and (N-2) frame data of receiving generate driving parameters 20.Should be pointed out that in time T 0, (N-1) and (N-2) frame data are in corresponding time T -1And T -2Be stored in frame memory 9 with compress mode.Cun Chu frame data must be at first decompressed in the past, for use in determining necessary driving parameters 20 in time T 0.Except the frame data that decompress to need, the present invention also by according to last in, first out (LIFO) agreement in each frame place interpolation with delete some frames and save frame memory 9.For example, in time T 0, frame (N) data are stored in frame memory 9 with compressed format, and (the least) frame of adding recently at least, and frame (N-2) data then are eliminated from frame memory 9 in illustrative example.Though should also be noted that frame (N-1) data are decompressed for using this moment, it is at next time interval T + 1From frame memory 9, be not eliminated with the LIFO similar fashion before.
It will be apparent to those skilled in the art that for compression/decompression processes described herein might have near harmless compression and decompression.Yet, in a preferred embodiment, accept some in check loss, so that the further optimization of processing procedure (for example, avoiding increasing the accuracy that can not cause the sensitive better image displaying quality of user).
As shown in Figure 1, display 1 also comprises digital temperature sensor 13, is used for the working temperature of perception display and is used to provide temperature compensation, so that reduce the temperature dependency of the gray-scale rendition of display.For this reason, temperature sensor 13 generates 4 digital bits of the actual work temperature of for example representing display, and the address entries of LUT 12 will be by additional bit extension.Be shown as storer 11 separately though should be pointed out that LUT 12, it in certain embodiments can be with realizing with frame memory 9 the same memories.
Table I is provided to further show frame data that are used for each frame of compression/de-compression and the method for the present invention that generates required driving parameters from these data.
Second row of reference table I.In time T 0, the data that in current frame (N), receive, i.e. frame (N) data, 2 places are received at the input node.In this time, frame (N) data are stored in storer 11 (secondary series) with the form of compression, and also generate required driving parameters 20 to realize the change of display unit 18 by the form (that is, by unpressed form) that receives simultaneously basically from current optical states to predetermined next optical states.Should be pointed out that in illustrative embodiment driving parameters 20 is to be that frame (N-1) data (row 4) generate according to frame (N) data with corresponding to the data of at least one original state.With the operation described basically as one man according to the LIFO agreement, remove frame (N-2) data (row 3) from storer 9.
Table I
Time The data that receive The data (with compressed format) of storage The frame data of removing The frame data that the driving parameters that requires for generation needs
T -1 The N-1 frame data The N-1 frame data The N-3 frame data N-1 frame data N-2 frame data
T 0 The N frame data The N frame data The N-2 frame data N frame data frame N-1 frame data
T +1 The N+1 frame data The N+1 frame data The N-1 frame data N+1 frame data N frame data frame
The driving parameters 20 that generates can comprise: the fixedly pulse of the amplitude of duration and variation; The pulse of the duration that has fixing amplitude, the polarity that replaces and between two extremums, change; Pulse length and amplitude both combination drive signals that can change wherein.For pulse amplitude drive signal, this predetermined driving parameters represents to comprise the amplitude of the drive signal of signed.For the drive signal of burst length modulation, predetermined driving parameters represents to form the duration and the sign of the pulse of drive signal.For the drive signal of mixing generation or pulse shape, predetermined driving parameters represents to form the amplitude and the length of driving pulse various piece.Predetermined driving parameters can for example be 8 digital bits.For each of look-up table 12, driving parameters is to be determined by experiment with different predetermined work temperature according to the corresponding grey level transition of selected type of electronic ink.
Second embodiment
Fig. 2 shows another embodiment of the present invention.In the present embodiment, except compressed image information to improve the memory storage density, present embodiment also compresses look-up table data (LUT) 12 to reach further memory storage density.
As shown in Figure 2, display 1 comprises whole display units of the display of Fig. 1, and comprises second compression unit 15 and second decompression unit 17, and they are the compression and decompression look-up table data respectively.Should be understood that, because look-up table data has only constituted less percentage in total data demand of display, thus by the improved storage density that realizes of compression look-up table not as describe among the former embodiment, to compress a large amount of frame data (image information) important like that.
The embodiment that should also be noted that replacement can utilize a plurality of look-up tables, rather than shown single LUT 12, compensates the big temperature variation that display 1 may stand.For example, in-22 ℃ to+80 ℃ temperature range, adjusting display, need to surpass 200 temperature compensation look-up tables (LUT) with 1/2 degree resolution.A plurality of temperature compensation LUT preferably can be stored in the storer 11 with the form of compression.In use, after determining the temperature of display 1, be identified corresponding to the LUT 12 in the middle of the LUT of a plurality of storages of the temperature of the detection of display 1, decompressed and be used under the control of display controller 7 and generate driving parameters 20 in above-mentioned mode.
Should be pointed out that in each embodiment compression and decompression unit 3,5,15 and 17 can merge in the display controller 7.Just, the function of compression and decompression unit can be integrated into display controller, removes the needs that utilize autonomous device thus, as what describe among the former embodiment.
Conclusion
In a word, as what from above explanation, see, improve the data storage density of in such display, using according to the electrophoretic display device (EPD) of embodiments of the invention.And carrying out the needed time of compression/decompression processes is unessential with respect to the operation that generates driving parameters in each frame in succession.By the LUT data in compressed image information and/or the display, can reach accurate gray-scale rendition with rational cost.
At last, above discussion only plans to illustrate the present invention, and should not be looked at as and be used for claims are restricted to accordance with any particular embodiment or embodiment group.For example, controller 7 can be that the application specific processor that is used for carrying out according to the present invention maybe can be a general processor, has only one to be used for carrying out according to the present invention in wherein a plurality of functions.Processor can utilize the part of program, a plurality of program segmenting to operate, and maybe can be the hardware unit that utilizes special use or multi-usage integrated circuit.Each system that is utilized also can be utilized in conjunction with other system.Therefore, though the present invention describes in detail especially for its concrete exemplary embodiment, but should see, can make many modifications and change and do not deviate from as that set forth in the claim afterwards, broad sense of the present invention and predetermined spirit and scope.Therefore technical descriptioon and accompanying drawing are to provide in the mode that illustrates, do not plan to limit the scope of claims.
When understanding claims, should see:
A) verb " comprise " do not get rid of with given claim in other unit of listing or the existence of action.
B) do not get rid of the existence of a plurality of such unit at the article " " of front, unit.
C) label in the claim only is used for illustrative purposes, and does not limit their protection domain.
D) several " devices " can be represented with same element or hardware or by the structure or the function of software implementation; And
Each disclosed unit can be by hardware components (for example, discrete electronic circuit), and software section (for example, computer program) or their combination are formed.

Claims (25)

1. an electrophoretic display device (EPD) (1) comprising:
Display (15), it further comprises a plurality of display units (18);
Input media (2) is used for being received in the image information of frame in succession;
First compression set (3) is used for compressing the image information of described reception to improve the utilizability of electrophoretic display device (EPD) (1) storer;
First memory (11) is used for the look-up table (12) of store predetermined waveform and time parameter, is used to implement the change of display unit (18) from current optical states to predetermined next optical states;
Second memory (9) is used for according to the storage of last in, first out (LIFO) agreement and deletes the image information of the reception of described compression;
First decompressing device (5), the image information of the reception of the described compression that is used to decompress; And
Controller (7) is configured to receive the image information of described compression, stores the image information of described compression, deletes described information compressed;
This controller (7) also is configured to the image information according to image information that receives and the decompression of reception at least one previous frame (N-1) in present frame (N), come to retrieve described look-up table (12), use the described waveform and the time parameter that are included in the described look-up table (12) and realize the change of display unit (18) from current optical states to predetermined next optical states from described storer (11).
2. the electrophoretic display device (EPD) of claim 1 also comprises second compression set (15), is used for compressing described look-up table (12) before in that described look-up table (12) is stored into described first memory (11).
3. the electrophoretic display device (EPD) of claim 1 also comprises second decompressing device (17), is used for the described look-up table (12) that decompression is stored in described storer (11).
4. the electrophoretic display device (EPD) of claim 1, also comprise a plurality of look-up tables (12), each look-up table in described a plurality of look-up table uses temperature as index, each look-up table in described a plurality of look-up table is for specific temperature, come specified waveform and time parameter according to the described image information that in described present frame (N), receives with corresponding to the image information of at least one previous frame (N-1), so that make the change of display unit (18) realization from current optical states to predetermined next optical states.
5. the electrophoretic display device (EPD) of claim 1 also comprises second compression set (15), is used for described a plurality of look-up table stores are being compressed described a plurality of look-up table before to described first memory (11).
6. the electrophoretic display device (EPD) of claim 1 also comprises temperature sensor (13), and it is configured to measure the temperature of the temperature of representing electrophoretic display device (EPD) (1), and the temperature of described measurement is sent to controller (7).
7. the electrophoretic display device (EPD) of claim 6, wherein said controller (7) also are configured to receive from described temperature sensor (13) temperature of described measurement.
8. the electrophoretic display device (EPD) of claim 1, wherein Yu Ding next optical states is a gray scale.
9. the electrophoretic display device (EPD) of claim 1, wherein Yu Ding next optical states is colored.
10. the electrophoretic display device (EPD) of claim 1, wherein compression set is carried out compression with the lossless compress device.
11. the electrophoretic display device (EPD) of claim 10, wherein the lossless compress device is applied to lossless compression algorithm the described image information that receives from described frame in succession.
12. the electrophoretic display device (EPD) of claim 1, wherein compression set is carried out compression with the lossy compression method device.
13. the electrophoretic display device (EPD) of claim 12, wherein the lossy compression method device the lossy compression method algorithm application to the described image information that from described frame in succession, receives.
14. a method that is used for improving the data storage density of electrophoretic display device (EPD) (1) may further comprise the steps:
Adjoining land is received in the image information in succession the frame;
Be compressed in the described image information that receives in the described frame in succession;
Stored waveform and time parameter are used to make the change of display unit (18) realization from current optical states to predetermined next optical states;
Agreement stores the described image information that receives into second memory (9) in described frame in succession according to last in, first out (LIFO);
For the frame (N) of current reception, from least one previous frame (N-1) reception of decompressing, be stored in the described compressed image information in the described second memory (9);
Image information according to described image information that in described present frame (N), receives and the described decompression of reception in described at least one previous frame (N-1), from described storer (11) retrieval waveform and time parameter, so that realize the change of display unit (18) from current optical states to predetermined next optical states; And
Use the waveform and the time parameter of described recovery, so that realize the described change of display unit (18) from described current optical states to described predetermined next optical states.
15. the method for claim 14, wherein said waveform and time parameter are stored in the look-up table (12), described look-up table is stored in the storer (11).
16. the method for claim 15 also is included in described look-up table (12) is stored into the action that described first memory (11) compresses described look-up table (12) before.
17. the method for claim 14, it is in a plurality of look-up tables of index that wherein said waveform and time parameter are stored in the temperature, each look-up table of described a plurality of look-up tables is for specific temperature, image information according to described image information that in described present frame (N), receives and reception in described at least one previous frame (N-1), come specified waveform and time parameter, be used to realize the change of display unit (18) from described current optical states to described predetermined next optical states.
18. the method for claim 17 also comprises following action: the temperature that detects indication electrophoretic display device (EPD) (1) temperature; Wherein said searching step is to carry out as retrieval table in described a plurality of look-up tables of index from be stored in described first memory (11) by the temperature of using described detection.
19. the method for claim 17 also is included in the action of described a plurality of look-up table stores being compressed before described a plurality of look-up tables to described first memory (11).
20. the method for claim 19, also comprise following action: detect the temperature of indication electrophoretic display device (EPD) (1) temperature, wherein said searching step is to carry out as retrieval table in the middle of described a plurality of look-up tables of index from be stored in described first memory (11) by the temperature of using described detection; And the described look-up table that retrieves that decompresses.
21. the method for claim 12, wherein compression step is carried out by the lossless compress device.
22. the method for claim 21, wherein the lossless compress device is applied to lossless compression algorithm the described image information that receives in described frame in succession.
23. the method for claim 12, wherein compression step is carried out by the lossy compression method device.
24. the method for claim 12, wherein the lossy compression method device the lossy compression method algorithm application to the described image information that in described frame in succession, receives.
25. a computer program that is used for improving the data storage density of electrophoretic display device (EPD) (1), computer program comprises computer code devices, is configured to:
Adjoining land is received in the image information in succession the frame;
Compress the image information of described reception, to improve the utilizability of the storer in the electrophoretic display device (EPD) (1);
Store look-up tables (12), this table specified waveform and time parameter are to be used to realize the change of display unit (18) from current optical states to predetermined next optical states;
Agreement is stored the image information that receives according to last in, first out (LIFO);
The image information of reception of described compression decompresses; And
Image information according to image information that in described present frame (N), receives and the decompression of reception at least one previous frame (N-1), application is included in described waveform and the time parameter in the described look-up table (12), so that realize the change of display unit (18) from described current optical states to described predetermined next optical states.
CNA2004800324325A 2003-11-03 2004-10-29 Electrophoretic display with compressed memory data Pending CN1875397A (en)

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