JP2008542811A - Crosstalk mitigation for active matrix displays - Google Patents

Abstract

To drive each pixel (21) coupled to the data line (23) to the desired optical state during the image update period, including crosstalk between the pixel (21) and the data line (23). In addition, the image driven data system (40) adds crosstalk compensated image driven data (CIDD) to the data line (23). To mitigate crosstalk, the image driven data system (40) does not include crosstalk between image driven data (IDD) pixels (21) and data lines (23) that are not crosstalk compensated. Non-crosstalk compensated image drive data (IDD) for driving the pixel to each desired image is determined, and non-crosstalk compensated image drive data (IDD), pixel (21) and data line (23). ) To determine the time averaged pixel data shift, and to determine the crosstalk compensated drive data (CIDD) based on the time averaged pixel data shift.

Description

  The present invention generally relates to crosstalk between pixels and data lines of an active matrix display. The present invention relates specifically to techniques for reducing such crosstalk to facilitate optimal image quality of pixels for active matrix displays.

  Polymer Vision is currently developing a rollable display based on a polymer electronics active matrix with an electrophoretic display effect. However, in such an active matrix display, there is a certain amount of cross-talk between all pixels and data lines during the image update of the active matrix display, which unfortunately is the active matrix display.・ Deteriorate the image quality of the display.

For example, FIG. 1 shows four exemplary pixels 21 having address elements 22 operably coupled to data lines 23 and individual select lines 24. During an image update period in which image driven data is applied to data line 23 by image driven data system 30, pixel 21 is addressed via address element 22 while pixel 21 is selected via individual select line 24. A particular segment of image driven data that is directly coupled to the data line 23 and applied to the data line 23 is received and stored as pixel data. Conversely, pixel 21 is capacitively coupled to data line 23 via a parasitic capacitor C _PAR while pixel 21 is not selected via its individual select line 24. Thereby, the pixel data of a pixel 21 is unexpectedly shifted by a segment of image drive data that is intended to be addressed by designating another pixel 21.

The exemplary addressing scheme used by the image driven data system 30 for the pixels 21 is based on the exemplary data look-up-table (“DLUT”) 100 shown in FIG. In addition, conversion of image update data into image drive data is included. As shown in FIG. 2, the optical state of pixel 21 is black (“P _PIUP = 0”) in the previous image update period (“P _PIUP = 0”), for the current image update period. If the desired optical state of the pixel 21 is black according to the image update data (“P _CIUP = 0”), the pixel 21 is pulsed low for one drive frame. The optical state of a pixel 21 is black in the previous image update period (“P _PIUP = 0”) and the desired optical state of that pixel 21 for the current image update period is white according to the image update data ( If “P _CIUP = 1”), the pixel 21 is pulsed high for nine drive frames. The optical state of a pixel 21 is white in the previous image update period (“P _PIUP = 1”) and the desired optical state of that pixel 21 for the current image update period is black according to the image update data ( If “P _CIUP = 0”), the pixel 21 is pulsed low for 6 drive frames. The optical state of a pixel 21 is white in the previous image update period (“P _PIUP = 1”) and the desired optical state of that pixel 21 for the current image update period is white according to the image update data ( If “P _CIUP = 1”), the pixel 21 is pulsed high for one drive frame.

  FIG. 3 shows conversion of the current image update data “0111” into image drive data composed of 10 drive frames. The transformation is derived from the DLUT based on the previous image update data “0011” in the previous image update period. Referring to FIGS. 1 and 3, during the image update period, the drive frame DF1 is pulsed low at pixel 21 (1) and pulsed high at pixels 21 (2) -21 (4). Related to being done. Drive frames DF2 to DF9 are involved in pixel 21 (2) being pulsed high, and drive frame DF10 is not involved in pulsing any of pixels 21.

  The effect of crosstalk between pixel 21 and data line 23 on the pixel drive data shown in FIG. 3 applied to pixel 21 is best understood by comparing FIG. 4 and FIG. In particular, FIG. 4 shows the desired pixel data (desired pixel data) for each pixel 21 for the drive frame 1 shown in FIG. 3, excluding crosstalk between the pixel 21 and the data line 23. DPD). The desired pixel data DPD for each pixel 21 is also achieved for the remaining drive frames DF2-DF10. Thereby, each pixel 21 is properly driven to the correct desired optical state, so that the result over the entire image update period is the optimal image quality of the pixel 21.

  In contrast, FIG. 5 shows the effective pixel data for each pixel 21 including the cross-talk CT between the pixel 21 and the data line 23 for the drive frame 1 shown in FIG. (Effective pixel data) (EPD). Here, any difference between the desired pixel data DPD (FIG. 4) and the effective pixel data EPD is a pixel data shift of pixel 21 due to crosstalk CT in the unselected row address period. A shift difference between the desired pixel data DPD (FIG. 4) and the effective pixel data EPD due to crosstalk CT in the unselected row address period can also occur for the remaining drive frames DF2-DF9. Thereby, the result over the entire image update period is a sub-optimal image quality of the pixel 21 because each pixel 21 is erroneously driven to its desired optical state. More specifically, in the context of electrophoretic-based active matrix displays, those skilled in the art will recognize that the shift difference between desired pixel data DPD and effective pixel data EPD for all drive frames is the electrophoretic material. It will be recognized that the particles in it will move at different speeds, and thus once the drive is complete, it will lead to a difference in particle distribution and thus a difference in gray levels (ie optical crosstalk).

  Crosstalk is not just an electrophoretic-based active matrix display developed by Polymer Vision, but a problem with virtually any type of active matrix display, especially field-shielded displays It is. Accordingly, the present invention provides an active matrix display and an image driven data system that implements a novel and unique technique for reducing crosstalk between pixels and data lines of the active matrix display. Provide a system to use.

  In one form of the invention, an active matrix display includes a data line and a plurality of pixels operatively coupled to the data line, each of which can be driven between a plurality of optical states. . An image driven data system is operatively coupled to the data lines, thereby driving each pixel to the desired optical state during the image update period, including crosstalk between the pixels and the data line. In order to achieve this, image drive data compensated for crosstalk is added to the data line. To mitigate crosstalk, the image driven data system uses non-crosstalk compensated image driven data to drive each pixel to its desired image without including crosstalk between the pixel and the data line. Determine the time-averaged pixel data shift based on the non-crosstalk-compensated image driven data and the crosstalk coupling constant between the pixel and the data line. Based on this, crosstalk compensated drive data is determined.

  The above forms and other features and advantages of the present invention will become more apparent from the following detailed description of various embodiments of the present invention read in conjunction with the accompanying drawings. The detailed description and drawings are merely illustrative of the invention rather than limiting the scope of the invention, which is defined by the appended claims and equivalents thereof.

A schematic representation of the pixel 21 (FIG. 1) shown in FIG. 6 includes a front plane capacitor C _FP connected to a pixel node PN and a common reference CREF; The pixel 21 using the storage capacitor C _STORE connected to the pixel node PN and the selection line 24 of the preceding pixel 21 is shown. An addressing element in the form of a thin film transistor OTFT is connected to the data line 23, the individual selection line 24 and the pixel node PN, so that during the selection of the pixel 21 via the individual selection line 24, the data line 23 is Image drive data coupled directly to the pixel node PN and then applied to the data line 23 is received and stored in the pixel 21. The parasitic capacitance C _PAR is between the data line 23 and the pixel node PN when image drive data is applied to the data line 23 and the pixel 21 is not selected via the select line 24 (Y). Established.

  The image driven data system 40 of the present invention implements the inventive principles of applying crosstalk compensated image driven data to the data line 23 according to one or more addressing schemes. Specifically, the inventors of the present invention theoretically calculated the effective time averaged voltage VEPAVG on each pixel 21 for each drive frame based on the following equations [1] to [3]. I found that I can decide on:

ここで、V_DD(i)はある駆動フレームの間にピクセルに書き込まれる駆動データ（drive data）、cはピクセル２１とデータ・ライン２３との間の結合定数、(1−c)は漏話スケーリング因子、Nはピクセルの総行数に解析される駆動フレーム数を乗算したもの、V_TAPDSは各ピクセルの時間平均されたピクセル・データ・シフト（time-averaged pixel data shift）である。たとえば、次の式[4]〜[8]は、図５に示された駆動フレーム１の間の各ピクセル２１上の実効的な時間平均された電圧V_EPAVGを示す：
V_EPAVG(i)＝V_PL*(1−c)＋V_TAPDS [4]
V_EPAVG(2)＝V_PH*(1−c)＋V_TAPDS [5]
V_EPAVG(3)＝V_PH*(1−c)＋V_TAPDS [6]
V_EPAVG(4)＝V_PH*(1−c)＋V_TAPDS [7]
V_TAPDS＝(c/4)*(V_PL＋3V_PH) [8]
本発明の発明者らによって、ピクセル２１とデータ・ライン２３との間の漏話の効果は、漏話スケーリング因子(1−c)および時間平均されたピクセル・データ・シフトV_TAPDSを補償／打ち消しすることによって、完全にはなくせないまでも、最小化できることが発見された。この目的に向けて、本発明者らが、イメージ駆動データ・システム４０が漏話スケーリング因子(1−c)および時間平均されたピクセル・データ・シフトV_TAPDSを補償／打ち消しし、ピクセル２１とデータ・ライン２３との間の漏話の効果を完全にはなくせないまでも、最小化できることを発見したのは、ここでの式[1]〜[3]からであった。しかしながら、そのような諸方法の以下の記述はここでの式[1]〜[3]から特に考案されたものの、本発明のイメージ駆動データ・システムによって漏話スケーリング因子および時間平均されたピクセル・データ・シフトを補償／打ち消しすることは、本発明の発明的原理に基づいて、他の式および／またはパラメータから考案することができる。

Where V _{DD (i)} is the drive data written to the pixel during a drive frame, c is the coupling constant between pixel 21 and data line 23, and (1-c) is the crosstalk scaling. The factor N is the total number of rows of pixels multiplied by the number of drive frames analyzed, and V _TAPDS is the time-averaged pixel data shift for each pixel. For example, the following equations [4]-[8] show the effective time averaged voltage V _EPAVG on each pixel 21 during the drive frame 1 shown in FIG.
V _{EPAVG (i)} = V _PL * (1−c) + V _TAPDS [4]
V _{EPAVG (2)} = V _PH * (1−c) + V _TAPDS [5]
V _{EPAVG (3)} = V _PH * (1−c) + V _TAPDS [6]
V _{EPAVG (4)} = V _PH * (1−c) + V _TAPDS [7]
V _TAPDS = (c / 4) * (V _PL + 3V _PH ) [8]
By the inventors of the present invention, the effect of crosstalk between pixel 21 and data line 23 compensates / cancels the crosstalk scaling factor (1-c) and the time averaged pixel data shift V _TAPDS. Was found to be able to minimize if not completely eliminated. To this end, we have compensated / canceled the crosstalk scaling factor (1-c) and the time-averaged pixel data shift V _{TAPDS so} that the image driven data system 40 can _detect pixel 21 and data It was from the equations [1] to [3] here that the crosstalk effect with the line 23 was found to be able to be minimized if not completely eliminated. However, although the following description of such methods was specifically devised from equations [1]-[3] herein, the crosstalk scaling factor and time-averaged pixel data by the image-driven data system of the present invention. Compensating / cancelling the shift can be devised from other equations and / or parameters based on the inventive principles of the present invention.

The flowchart 50 shown in FIG. 7 represents the crosstalk scaling factor mitigation method of the present invention. Step S52 of the flowchart 50 includes the determination of the crosstalk scaling factor based on the crosstalk coupling constant between the pixel 21 and the data line 23 (eg, c according to equation [2] here), and step S54 of the flowchart 50. Includes adjusting the pixel data voltage level based on the crosstalk scaling factor determined in step S52 (eg, V _PH and V _PL shown in FIGS. 4 and 5).

  In fact, in view of the fact that the crosstalk scaling factor is independent of the image update data, the adjustment of the pixel data voltage level is for a suitable driver of the image driven data system 40 as one skilled in the art will recognize. The waveform for the image drive data can be stretched by a factor 1 / (1-c). Furthermore, the image driven data system of the present invention can be designed to work with various types of active matrix displays having different crosstalk coupling constants between each data line and its respective pixel. In such a case, the image-driven data system of the present invention has an appropriate crosstalk coupling constant between each data line and its respective pixel depending on the type of active matrix display driven by the system. Should be programmed to calculate and / or store.

The flowchart 60 shown in FIG. 8 represents the method of mitigating time-averaged pixel data shifts of the present invention. This is mainly due to the time averaged pixel data shift caused by crosstalk between the pixel 21 and the data line 23 (eg, the time averaged pixel data shift V _TAPDS in equation [3] here). Is intended to compensate / cancel. Nevertheless, the need to compensate / cancel the crosstalk scaling factor can be addressed individually (eg, flowchart 50 shown in FIG. 7), or along with time averaged pixel data shifts. Can also be addressed (eg, flowchart 80 shown in FIG. 12).

  Referring to FIG. 8, to facilitate understanding of the time-averaged pixel data shift mitigation method of the present invention, flowchart 60 is described in the context of four pixels 21 as shown in FIG. . From this exemplary description of flowchart 60, those skilled in the art will understand how to apply the time-averaged pixel data shift mitigation method of the present invention to a matrix of pixels for each data line. I will.

  With reference to FIGS. 6 and 8, the flowchart 60 is initiated by the image driven data system 40 whenever the image projected by the pixel 21 needs to be updated. Step S62 of the flow chart 60 excludes crosstalk between the pixel 21 and the data line 23 and the image driven data system 40 is not crosstalk compensated for driving the pixel 21 to the desired optical state. Includes determining image driven data. In an embodiment of step S62, image update data for the pixel 21 is used for image drive data that is not crosstalk compensated (eg, as shown in FIG. 3) using an image driven data lookup table (eg, DLUT 100 as shown in FIG. 2). Image drive data IDD).

Step S64 of the flowchart 60 includes the image-driven data system 40 determining a time-averaged pixel data shift based on the non-crosstalk compensated image-driven data and the crosstalk coupling constant. One embodiment of step S64 is described herein to determine a time-averaged pixel data shift V _TAPDS based on the non-crosstalk compensated image driven data IDD (FIG. 3) and the crosstalk coupling constant c. Equations [2] and [3] are implemented.

  Step S66 of the flowchart 60 includes the image driven data system 40 determining crosstalk compensated image driven data based on the time averaged pixel data shift, and step S68 of the flowchart 60 includes image S68. The drive data system 40 includes applying crosstalk compensated image drive data to the data line 23 according to one or more addressing schemes of the image drive data system 40.

  In practice, the present invention does not impose any restrictions or constraints on how the flowchart 60 is implemented. Thus, the following description of the embodiment of steps S66 and S68 shown in FIGS. 9-19 does not limit the scope of steps S66 and S68.

One embodiment of steps S66 and S68 is based on the introduction of a “blank addressing period” (ie, a period in which no row addressing) within one or more of the drive frames. This embodiment may require increasing the time period of each drive frame and / or shortening each row addressing period of each drive frame. This embodiment can be implemented in driver hardware having a selected number of rows greater than the number of pixel rows, as will be appreciated by those skilled in the art. Furthermore, this embodiment provides direct compensation for time averaged pixel data shifts (eg, V _{TAPDS in} equation [3] here).

  FIG. 9 shows a flowchart 70 representing a method according to the present invention for introducing a “blank addressing period” within one or more drive frames of an image update period.

  Step S72 of the flowchart 70 determines the image driven data system 40 as a function of reducing crosstalk compensated non-driven data as a function of reducing the time averaged pixel data shift per drive frame or per set of drive frames. To include. In an embodiment of step S72, the crosstalk compensated non-driven data is constructed over a blank addressing period of the drive frame, so that the difference between the time average pixel data shift and the average voltage of the crosstalk compensated non-driven data is It is made to be 0 or almost 0.

  Step S74 of flowchart 70 includes image drive data system 40 adding to the data line 23 image drive data that has not been crosstalk compensated during a row addressing period of a drive frame. This is illustrated in FIG. 10 for row address periods 1-4 of drive frame 1 '.

  Step S76 of flowchart 70 includes image drive data system 40 adding crosstalk compensated non-drive data to data line 23 during the blank addressing period of the drive frame. This is illustrated in FIG. 10 for the blank address period of the drive frame 1 '.

  In the background of FIG. 10, cross-talk compensated image drive data CIDD is not cross-talk compensated during row addressing periods 1-4 (eg, IDD of DF1 shown in FIG. 3). Image drive data is added to data line 23, including cross-talk compensation non-drive data CNDD being added to data line 23 during the blank addressing period.

  Referring also to FIG. 8, those skilled in the art will recognize that flowchart 70 perfectly compensates / cancels the time-averaged pixel data shift for static images, but for images that are changing from drive frame to drive time. It will be appreciated that such compensation / cancellation of the averaged pixel data shift is not perfect. Thus, in practice, the actual implementation of the blank addressing period will depend on many factors. Such factors include, but are not limited to, the structural configuration of each pixel and the individual addressing elements and the addressing scheme used. In addition, a weighted average of time averaged pixel data shifts per drive frame may be implemented.

Another exemplary embodiment of steps S66 and S68 (FIG. 7) corrects the mapping between the desired pixel voltage V _DPD and the required data line voltage V _RIDD as shown in FIG. Based on. The dotted line excludes any crosstalk between the pixel 21 and the data line 23, and is between 1 and 1 of the desired pixel voltage V _DPD and the required data line voltage V _RIDD (ie, slope S1 = 1) represents the mapping. The solid line represents the mapping between the desired pixel voltage V _DPD and the required data line voltage V _RIDD , including any crosstalk between the pixel 21 and the data line 23, where the straight line is Has slope S2 and intercept OS according to [10] and [11]:
S2 = 1 / (1−c) [10]
OS = −V _TAPDS / (1−c) [11]
Again, c is the coupling constant between pixel 21 and data line 23, (1-c) is the crosstalk scaling factor, and V _TAPDS is the time averaged pixel data shift for each pixel 21. is there.

FIG. 12 is a flowchart 80 illustrating a map correction method according to the present invention. Step S82 of the flowchart 80 encompasses image data driving system 40 calculates the map correction voltage V _MC. In one embodiment of step S82, the map correction voltage _VMC is calculated according to the following equation [12]:
V _MC = (V _DPD −V _TAPDS ) / (1−c) [12]
Step S84 of the flowchart 80 encompasses image drive data system 40 determines the image drive data crosstalk compensation based on the map correction voltage V _MC. In certain embodiments, the image drive data that is not crosstalk compensation (e.g., IDD of DF1 shown in FIG. 2) is amplitude modulated by the map correction voltage V _MC, give it the cross-talk compensated image drive data CIDD. This is exemplarily shown by the dashed arrows in FIG.

  In step S86 of the flowchart 80, the image drive data system 40 exemplarily shows the crosstalk compensated image drive data as shown in FIG. 13, and the row addressing period 1 of the crosstalk compensated image drive data CIDD and the drive frame 1 is shown in FIG. Including adding to data line 23 according to an addressing scheme having .about.4.

Another exemplary embodiment of steps S66 and S68 (FIG. 8) is based on creating a compensation lookup table for determining crosstalk compensation drive data. The look-up table is by correlating the time averaged pixel data shift with image compensation data to reduce the time averaged pixel data shift as much as possible. For example, the correlation divides the time-averaged pixel data shift into two or more numerical ranges and relates this numerical range to each optical state of pixel 23 (eg, two optical states for black and white). Including that. Those skilled in the art will increase the number of time averaged pixel data shift numerical ranges and / or the number of optical states of the pixel 23 correlated in the compensation lookup table of the present invention. It will be recognized that the accuracy of data shift compensation / cancellation is increased.

FIG. 14 shows a flowchart 90 representing the compensation search table method of the present invention. Step S92 of flowchart 90 includes image drive data system 40 determining crosstalk compensation drive data from a compensation lookup table (“CLUT”) (eg, CLUT 101 shown in FIG. 15). The positive range and negative range V _TAPDS are correlated to the black optical state “0” and the white optical state “1” of the pixel 23. In step S94 of the flowchart 90, the image driving data system 40 addresses the image driving data that is not crosstalk compensated (for example, the IDD of DF1 shown in FIG. 3) during the image update phase shown in FIG. Including adding to the data line 23 according to (one or more). In step S96 of the flowchart 90, the image drive data system 40 sends the crosstalk compensation drive data to the address scheme (single) during the compensation drive phase ("CDP") of the image update period shown in FIG. Or adding to the data line 23 according to the plurality.

  An optional step S98 of the flowchart 90 is that the image driven data system 40 generates blank image driven data based on a reset look-up-table (“RLUT”) (eg, RLUT 102 shown in FIG. 17). , Including applying to data line 23 according to the addressing scheme (s) during the reset drive phase (“RDP”) of the image update period shown in FIG. RLUT 102 as shown in FIG. 17 is a blank version of DLUT 100 (FIG. 2), according to which various types of images require internal hardware to reflect the current image state of the active matrix display. Image update data for resetting internal hardware for the drive data system 40 is added to the RLUT 102.

  In the context of FIG. 2, FIG. 16 and FIG. 18, crosstalk compensated image driven data is the non-crosstalk compensated image driven data IDD, image update applied to data line 23 during the image update phase of the image update period. The crosstalk compensation drive data CDD applied to the data line 23 during the compensation drive phase of the period and the reset drive data RDD applied to the data line 23 during the reset drive phase of the image update period.

  In practice, the present invention constrains any limitations on the structural configuration of the image-driven data system of the present invention and the types of active matrix displays that can be operated by the image-driven data system of the present invention. I will not impose it. Thus, the following description of exemplary image driven data systems and active matrix displays does not limit the scope of image driven data systems and active matrix displays for the purposes of the present invention.

Referring to FIG. 19, the image data driver system 40 includes a memory 41, a central processing unit (“CPU”) 42, one or more peripheral devices 43, a display driver 44, one or more column drivers. 45 and one or more row drivers 46 are used. An active matrix display 20 (eg, an electrophoretic-based display, a liquid crystal display or a light emitting diode display) includes an M × N matrix of pixels 21 with respective column lines (ie, data lines) and row lines. (Ie select lines) are operatively coupled to driver 45 and driver 46, respectively. In accordance with the inventive principles of the present invention exemplarily described in FIGS. 6-18 and the corresponding description, the CPU 42 and the display driver 44 operate cooperatively to each select line 24 of the display 20. Along with a row driver (s) 36 that selectively applies a row selection signal, a column driver (s) 45 is controlled in applying crosstalk compensated drive data to each data line of the display 20; This drives each pixel 21 to the desired optical state during each image update period.

  Referring to FIGS. 7-18, the term “decision” refers to an active decision by the driver system (ie, the driver system dynamically determines all the algorithms necessary to make the required decision). Or passive determination by the driver system (ie, the driver system reads the results of the predetermined execution of all algorithms needed to make the required decisions).

  The embodiments of the present invention have been described above by way of example only, and modifications and changes may be made to the described embodiments without departing from the scope of the present invention as defined by the appended claims. Will be apparent to those skilled in the art. Further, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The verb “comprising” does not exclude the presence of elements or steps other than those listed in a claim. The singular form does not exclude the plural. The present invention may be implemented by hardware having several different elements and by a suitably programmed computer. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The fact that measures are mentioned in different independent claims does not indicate that a combination of these measures cannot be used to advantage.

1 is a block diagram of pixels known in the art driven by an image driven data system known in the art. FIG. FIG. 3 is an exemplary image driven data lookup table (“DLUT”) known in the art for converting image update data to image driven data. FIG. 3 illustrates exemplary image drive data based on the DLUT shown in FIG. 2 as known in the art. Exemplary desired pixel data associated with adding the image drive data shown in FIG. 3 to the data line shown in FIG. 1, excluding the crosstalk between the data line and pixels shown in FIG. FIG. Exemplary effective pixel data associated with applying the image drive data shown in FIG. 3 to the data line shown in FIG. 1, including crosstalk between the data line and pixels shown in FIG. FIG. FIG. 2 shows a schematic representation of a pixel known in the art driven by an image driven data system according to an embodiment of the present invention. 6 is a flowchart illustrating a crosstalk scaling factor mitigation method according to the present invention. 4 is a flowchart representing a method of mitigating time-averaged pixel data shift according to the present invention. 9 is a flowchart illustrating a first embodiment of the time-averaged pixel data shift mitigation method shown in FIG. 8 according to the present invention. It is a figure which shows execution of the flowchart shown in FIG. FIG. 4 shows a mapping of a desired pixel data voltage level to a required image drive data voltage level. FIG. 9 is a flow chart representing a second embodiment of the time averaged pixel data shift mitigation method shown in FIG. 8 in accordance with the present invention. FIG. 13 illustrates an exemplary execution of the flowchart shown in FIG. FIG. 9 is a flowchart illustrating a third embodiment of the time-averaged pixel data shift mitigation method shown in FIG. 8 according to the present invention. FIG. 5 is a diagram illustrating an exemplary compensation lookup table (“CLUT”) for converting image compensation data to compensation drive data in accordance with the present invention. FIG. 14 illustrates an exemplary execution of the flowchart shown in FIG. 13. FIG. 6 illustrates an exemplary image reset lookup table (“RLUT”) for resetting image drive data according to the present invention. FIG. 14 illustrates an exemplary execution of the flowchart shown in FIG. 13. 1 illustrates an embodiment of an image driven data system according to the present invention. FIG.

Claims (20)

An active matrix display including data lines operatively coupled to a plurality of pixels operable to be driven between the plurality of images;
Crosstalk compensation to the data line to drive each pixel to the desired optical state during the image update period, including operably coupled to the data line and including crosstalk between the pixel and the data line. A system having an image driven data system adapted to add rendered image driven data,
The image drive system is operable to determine non-crosstalk compensated image drive data for driving each pixel to its respective desired image without including crosstalk between the pixel and the data line. Yes,
The image driving system is further operable to determine a time averaged pixel data shift based on non-crosstalk compensated image driving data and a crosstalk coupling constant between the pixel and the data line;
The image drive system is further operable to determine crosstalk compensated drive data based on the time averaged pixel data shift of pixels.   The system of claim 1, wherein the crosstalk compensated image driven data is further based on a crosstalk scaling factor that depends on a crosstalk coupling constant between the pixel and the data line. The crosstalk compensated image drive data includes non-crosstalk compensated image drive data derived from image update data;
The crosstalk compensated image driven data further includes crosstalk compensated non-driven data derived as a function to reduce the time averaged pixel data shift.
The system of claim 1. Adding the crosstalk compensated image drive data to a data line:
Adding the non-crosstalk compensated image driving data to the data line during at least one row address period of an image update period;
Adding the crosstalk compensated non-driven data to the data line during at least one blank address period of the image update period;
The system of claim 3.   The non-crosstalk compensated image drive data based on at least one of the time averaged pixel data shift and the crosstalk coupling constant between a pixel and a data line. The system of claim 1, comprising amplitude modulation of Adding the crosstalk compensated image drive data to a data line:
Applying the amplitude modulation of the non-crosstalk compensated image drive data to a data line during at least one row address period of an image update period;
The system of claim 5. The crosstalk compensated image drive data comprises non-crosstalk compensated image drive data derived from image update data;
The crosstalk compensated image drive data further includes crosstalk compensation drive data derived from the correlation of the image compensation data and the time averaged pixel data shift, the image compensation data being the time averaged pixel.・ It is a function to reduce data shift.
The system of claim 1. Adding the crosstalk compensated image drive data to a data line:
Adding the non-crosstalk compensated image driven data to the data line during the image update phase of the image update period;
Including adding crosstalk compensated non-driven data to the data line during the compensated drive phase of the image update period,
The system of claim 7. The crosstalk compensated image drive data further includes reset image drive data derived from image update data,
Adding the crosstalk compensated image drive data to the data line further comprises adding the reset image drive data to the data line during an image reset phase of an image update period;
The system of claim 8.   The system of claim 1, wherein the active matrix display is selected from a group of displays including electrophoretic based displays, liquid crystal displays, and light emitting diode displays. An active matrix display including data lines operatively coupled to a plurality of pixels operable to be driven between the plurality of images;
An image driven data system, the image driven data system comprising:
Means for applying crosstalk compensated image drive data to the data line to drive each pixel to a desired optical state during the image update period, including crosstalk between the pixel and the data line;
Means for determining non-crosstalk compensated image drive data for driving each pixel to a respective desired image without including crosstalk between the pixel and the data line;
Means for determining a time averaged pixel data shift based on the non-crosstalk compensated image driven data and a crosstalk coupling constant between the pixel and the data line;
Means for determining crosstalk compensated drive data based on said time averaged pixel data shift of pixels.   12. The system of claim 11, wherein the crosstalk compensated image driven data is further based on a crosstalk scaling factor that depends on the crosstalk coupling constant between a pixel and a data line. The crosstalk compensated image drive data includes non-crosstalk compensated image drive data derived from image update data;
The crosstalk compensated image driven data further includes crosstalk compensated non-driven data derived as a function to reduce the time averaged pixel data shift.
The system of claim 11. Means for adding the crosstalk compensated image drive data to a data line:
Adding the non-crosstalk compensated image driving data to the data line during at least one row address period of an image update period;
Adding the crosstalk compensated non-driven data to the data line during at least one blank address period of the image update period;
The system of claim 13.   The non-crosstalk compensated image drive data based on at least one of the time averaged pixel data shift and the crosstalk coupling constant between a pixel and a data line. The system of claim 11, comprising amplitude modulation of: Adding the crosstalk compensated image drive data to a data line:
Applying the amplitude modulation of the non-crosstalk compensated image drive data to a data line during at least one row address period of an image update period;
The system of claim 15. The crosstalk compensated image drive data comprises non-crosstalk compensated image drive data derived from image update data;
The crosstalk compensated image drive data further includes crosstalk compensation drive data derived from the correlation of the image compensation data and the time averaged pixel data shift, the image compensation data being the time averaged pixel.・ It is a function to reduce data shift.
The system of claim 11. Means for adding the crosstalk compensated image drive data to a data line:
Adding the non-crosstalk compensated image driven data to the data line during the image update phase of the image update period;
Including adding crosstalk compensated non-driven data to the data line during the compensated drive phase of the image update period,
The system of claim 17. The crosstalk compensated image drive data further includes reset image drive data derived from image update data,
Adding the crosstalk compensated image drive data to the data line further comprises adding the reset image drive data to the data line during an image reset phase of an image update period;
The system of claim 18.   The system of claim 11, wherein the active matrix display is selected from a group of displays including an electrophoretic based display, a liquid crystal display, and a light emitting diode display.

Images