Patent Publication Number: US-8970473-B2

Title: Bistable display and method of driving a panel thereof

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Taiwan application serial no. 100111065, filed on Mar. 30, 2011. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of specification. 
     TECHNICAL FIELD 
     The disclosure relates to a flat panel display technology, more particularly, to a bistable display and a method of driving a panel thereof. 
     BACKGROUND 
     A bistable display uses a bistable medium to perform displaying. The techniques for achieving a bistable display includes the techniques of an electronic ink (E-Ink) display, a cholesteric liquid crystal display, (ChLCD), an electro-phoretic display (EPD), an elecdtrowetting display (EWD), or a quick response-liquid powder display (QR-LPD), etc. Moreover, with the increasing use of portable electronic devices, products that apply the bistable display technique, such as e-paper and e-book, have gradually captured the attention of the market. 
     In general, e-papers and the e-books adopt the EPD technique for displaying images. Taking a black-and-white e-book as an example, each of the pixels in the e-book is mainly composed of the black-color electrophoresis buffer and white charged particles doped in the black-color electrophoresis buffer. By providing voltages to the pixels, the white charged particles are driven to shift so that each of the pixels could display black, white, or different gray levels. Taking a colorful e-book for as an example, each of the pixels in the e-book is mainly composed of different micro-cups formed with red-color electrophoresis buffer, green-color electrophoresis buffer, and blue-color electrophoresis buffer, respectively doped with white charged particles. By providing voltages to the pixels, the white charged particles are driven to shift so that each of the pixels could display red, green, blue, or different color levels. 
     To lower the manufacturing cost of an e-paper or an e-book, a half source driving (HSD) panel structure is proposed as shown in  FIG. 1 . HSD adopts a switch thin film transistor to allow the data signal received by a same data line to be respectively sent to two pixels in a common pixel at different time points.  FIG. 2  is the driving waveform diagram of the panel structure in  FIG. 1 . Referring to both  FIGS. 1 and 2  and as clearly illustrated in  FIG. 2 , each of the scan lines G 1  to G 4  respectively receives a scan signal formed with three pulses PLS 1  to PLS 3 . The first pulse PLS 1  is used for controlling the operation of the switch thin film transistor (STFT), while the second and the third pulses PLS 2  and PLS 3  are respectively applied to enable the two pixels Px 1  and Px 2  in the corresponding common pixel Px (x being a positive integer). 
     Accordingly, the data signal received by the same data line can be respectively sent to the two pixels Px 1  and Px 2  in the corresponding common pixel Px during different time points. For example, the data signal received by the data line D 1  can be sent to pixel P 11  in the common pixel P 1  at time ( 1 ), while the data signal received by the data line D 1  can be sent to pixel P 12  in the common pixel P 1  at time ( 2 ). Further for example, the data signal received by the data line D 1  can be sent to the pixel P 21  in the common pixel P 2  at time ( 3 ), while the data signal received by the data line D 1  can be sent to pixel P 22  in the common pixel p 22  t time ( 4 ), and so on. 
     Since the current technique of driving an electrophoresis display with particles mainly adopt a single lookup table mechanism to respectively obtain the driving waveform of each pixel in the electrophoresis display panel with HSD. Additionally, there is a time difference between the second and the third pulses PLS 2  and PLS 3  in the scan signal respectively received by each of the scan lines G 1  to G 4 , and the display times of the two pixels Px 1  and Px 2  in the corresponding common pixel Px are thereby different. Hence, if five positions ( 1 ) to ( 5 ) of the pixel P 1  is to be measured (as shown in  FIG. 3 ), based on the results of the measurement shown in  FIG. 4 , the illumination (whiteness) of pixel P 11  is higher than that of pixel P 12  under the condition of the same pixel gray level  15 . Accordingly, the illumination (whiteness), gamma curve, and contrast of the pixels P 11  and P 12  are different. 
     SUMMARY 
     An exemplary embodiment of the disclosure provides a bistable display and a driving method of a bistable display panel, wherein at least some of the problems confronted by the prior art could be effectively mitigated. 
     An exemplary embodiment of the disclosures provides a bistable display device, which includes a bistable display panel and a driving device, wherein the bistable display panel includes at least a first pixel and a second pixel, and these two pixels commonly share a data line. The driving device is coupled with the bistable display panel, wherein under a same pixel gray level, the driving device provides different source driving waveforms to the first pixel and the second pixel. 
     An exemplary embodiment of the disclosure provides a driving method of a bistable display panel, wherein the bistable display panel includes at least a first pixel and a second pixel, and these two pixels commonly share a data line. The driving method includes at least providing different source driving waveforms to the first pixel and the second pixel under a same pixel gray level. 
     According to an exemplary embodiment of the disclosure, the different source driving waveforms are obtained from two different types of lookup table mechanisms. Further, the two different types of lookup table mechanisms include a first lookup table mechanism and a second lookup table mechanism. The first lookup table mechanism is formed with a first pixel voltage driving waveform and a first common voltage driving waveform of the first pixel, and the second lookup table mechanism is formed with a second pixel voltage driving waveform and the second common voltage driving waveform of the second pixel. 
     According to an exemplary embodiment of the disclosure, the first pixel is driven by the driving device earlier than the second pixel. 
     According to an exemplary embodiment of the disclosure, under the condition that the first pixel and the second pixel achieve the same pixel gray level, a time to drive the second pixel by using the second lookup table mechanism during a time period of displaying a frame is greater than a time to drive the first pixel by using the first lookup table mechanism during the time period of displaying the frame (i.e. a frame time period). In this case, the first pixel voltage driving waveform and the second pixel voltage driving waveform may have the same waveform phase, and the first common voltage driving waveform and the second common voltage driving waveform may have the same waveform phase. 
     According to another exemplary embodiment of the disclosure, under the condition that the first pixel and the second pixel achieve the same pixel gray level, a time to drive the second pixel by using the second lookup table mechanism during a time period of displaying a frame is equal to the time to drive the first pixel by using the first lookup table mechanism during the time period of displaying the frame (i.e. a frame time period). In this case, the first pixel voltage driving waveform and the second pixel voltage driving waveform may have different waveform phases, and the first common voltage driving waveform and the second common voltage driving waveform may have the same waveform phase. 
     According to another exemplary embodiment of the disclosure, a data signal and a common voltage respectively received by a pixel electrode and a common electrode of the first pixel and the second pixel are an AC form, wherein the data signal is related to the first pixel voltage driving waveform and the second pixel voltage driving waveform, and the common voltage is related to the first common voltage driving waveform and the second common voltage driving waveform. 
     According to another exemplary embodiment of the disclosure, the data signal and the common voltage respectively received by the pixel electrode and the common electrode of the first pixel and the second pixel are respectively an AC form and a DC form, wherein the data signal is related to the first pixel voltage driving waveform and the second pixel voltage driving waveform, and the common voltage is related to the first common voltage driving waveform and the second common voltage driving waveform. 
     According to the exemplary embodiments of the disclosure, two different types of lookup table mechanisms are applied to respectively obtain the driving waveform of each pixel in an HSD bistable display panel, which is different from the conventional approach of using a single lookup table mechanism, to compensate the latter driven pixel in the two pixels that commonly share a data line. Hence, when displaying a same pixel gray level, the driving waveforms of the two pixels that commonly share a data line would be different. Accordingly, under the condition of a same pixel gray level, the illumination (regardless it is the whiteness or the blackness), the gamma curve, and the contrast of the two pixels commonly sharing a data line will be more consistent to enhance the display quality of the bistable display device. 
     The invention and certain merits provided by the invention can be better understood by way of the following exemplary embodiments and the accompanying drawings, which are not to be construed as limiting the scope of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. 
         FIG. 1  is a schematic diagram of a conventional half source driving (HSD) panel structure. 
         FIG. 2  is diagram of a driving waveform of the panel structure in  FIG. 1 . 
         FIG. 3  is a schematic diagram for measuring the different positions on the pixel P 1  in  FIG. 1 . 
         FIG. 4  is a diagram showing the measurement results of  FIG. 3 . 
         FIG. 5  is a schematic diagram of a bistable display  50  of an exemplary embodiment of the disclosure. 
         FIG. 6A  to  FIG. 9D  are schematic diagrams of the driving waveform of the common pixel Px in the bistable display panel  501  according to an exemplary embodiment of the disclosure. 
         FIG. 10  is a flow chart of steps of the driving method of a bistable display according to an exemplary embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS 
     Reference now is made to the accompanying drawings to describe the specific embodiments and examples of the invention. Moreover, the drawings are strictly provided for an illustration purpose, and are not to be construed as limiting the scope of the invention. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. 
       FIG. 5  is a schematic diagram of a bistable display  50  of an exemplary embodiment of the disclosure Referring to  FIG. 5 , the bistable display  50  includes a bistable display panel  501  and a driving device  503 , wherein the bistable display panel may include a half source driving (HSD) panel structure, as shown in  FIG. 1 . Alternatively speaking, the bistable display panel  501  includes a plurality of common pixels Px (x being a whole number) arranged in an array (i*j, i and j being whole numbers), and each common pixel Px includes two pixels (for example, a first pixel Px 1  and a second pixel Px 2 ), wherein the first pixel Px 1  and the second pixel Px 2  of each common pixel Px commonly share/use a corresponding data line Dx (x being a whole number) through a switch thin film transistor (STFT). 
     According to an exemplary embodiment of the disclosure, the bistable display panel  50  may be a micro-cup electrophoresis display panel. Obviously, a micro-cup electrophoresis display panel is used as an exemplary example and should not be adopted for limiting the scope of the present invention. The bistable display panel  50  could be other types of bistable display panel, such as a cholesteric liquid crystal display. Since anyone with a general knowledge in this technical area is aware of the structure of a bistable display panel, a detail disclosure thereof will not be reiterated herein. 
     Moreover, the driving device  503  is coupled to the bistable display panel  501 , and the driving device  503 , under a same pixel gray level, provides different source driving waveforms to the first pixel Px 1  and the second pixel Px 2  in each common pixel Px. Further, the different source driving waveforms may be obtained via two different types of lookup table mechanisms, for example, the first lookup table mechanism  505   b  and the second lookup table mechanism  505   c . More specifically, the driving device  503  may include a timing controller (T-con)  505 , a gate driver  507 , a source driver  509 , and a common electrode driving unit  511 . The timing controller  505  may include a frame counter  505   a  and a first lookup table mechanism  505   b  and a second lookup table mechanism  505   c.    
     In this exemplary embodiment, the frame counter  505   a  is used in coordinating with the timing controller  505  for realizing the time of each frame of the bistable display  50 . Further, the first lookup table mechanism  505   b  and the second look-up table mechanism respectively correspond to a lookup table to be built in a memory at either the interior or the exterior of the timing controller  505 . Furthermore, the first lookup table mechanism  505   b  is formed with a first pixel voltage driving waveform and a first common voltage driving waveform of each first pixel Px 1 , while the second lookup table mechanism  505   c  is formed with a second pixel voltage driving waveform and a second common voltage driving waveform of each second pixel Px 2 . 
     On the other hand, the timing controller  505  controls the operations of the gate driver  507 , the source driver  509  and the common electrode driving unit  511  so as to drive the first pixel Px 1  and the second pixel Px 2  in each common-pixel Px in the bistable display panel  501 . More particularly, the timing controller  505  controls the gate driver  507  to generate a scan signal (SS) as shown in  FIG. 2  in order to control the operation of the switch thin film transistor (STFT) using the pulse PLS 1  and to respectively enable the first pixel Px 1  and the second pixel Px 2  in each common-pixel Px using the pulses PLS 2  and PLS 3 . 
     Moreover, the timing controller  505  uses the first lookup table mechanism  505   b  and the second lookup table mechanism  505   c  to control the source driver  509  and the common electrode driving unit  511  to respectively generate data signal (DS) and common voltage (Vcom), which are being respectively provided to the pixel electrode (not shown) and the common electrode (not shown) of each first pixel Px 1  and each second pixel Px 2 . Moreover, the data signal and the common voltage Vcom respectively received by the pixel electrode (not shown) and the common electrode (not shown) of each first pixel Px 1  and each second pixel Px 2  can both be the AC form, or can be respectively the AC form and the DC form; however, the actual design would depend on the practical demands and requirements. Accordingly, the data signal is related to the first and the second pixel voltage driving waveforms, while the common voltage Vcom is related to the first and the second common voltage driving waveforms. 
     According to the present exemplary embodiment, in response to the scan signal SS, as shown in  FIG. 2 , generated by the gate driver  507 , each first pixel Px 1  is driven earlier by the driving device  503  than each second pixel Px 2 . Moreover, under the condition that the two pixels Px 1  and Px 2  in each common pixel achieve the same pixel gray level, a time for the driving device  503  to drive each second pixel Px 2 , during a time period for displaying one frame (i.e. a frame time period), by using a second lookup table mechanism  505   c  is greater than a time for the driving device  503  to drive each first pixel Px 1 , during the time period for displaying one frame (i.e. a frame time period), by using a first lookup table mechanism  505   b . The so-called “the time period for displaying one frame” may refer to as the driving time/period of the bistable display  50 . Accordingly, the timing controller  505  uses a first lookup table mechanism  505   b  to obtain the pixel voltage driving waveform and the common voltage driving waveform of each first pixel Px 1  for controlling the source driver  509  and the common electrode driving unit  511  to drive each first pixel Px 1 . The timing controller  505  also uses the second lookup table mechanism  505   c  to obtain the pixel electrode driving waveform and the common voltage driving waveform of each second pixel Px 2  for controlling the source driver and the common electrode driving unit  511  to drive each second pixel Px 2 . 
     The data signal and the common voltage Vcom respectively received by each of the pixel electrode and the common electrode of each first pixel Px 1  and each second pixel Px 2  are assumed to be the AC form. Further, the pixel voltage driving waveform and the common voltage driving waveform of each first pixel Px 1  and each second pixel Px 2 , respectively obtained by the timing controller  505  using the first lookup table mechanism  505   b  and the second lookup table mechanism  505   c , have four phases, for example, a first phase for executing mechanical balance (which is the normalization of a driving waveform), a second phase and a third phase for executing reset (which is the elimination of a residual image), and a fourth phase of driving pixel (which is the displaying of an image). Each phase includes a plurality of frame times. 
     Under the above condition, when the timing controller  505  uses the first lookup table mechanism  505   b  to obtain the pixel voltage driving waveform and the common voltage driving waveform of each first pixel Px 1  to display, as shown in  FIG. 6A , white gray level (gray  15 ) (because the level of the common voltage Vcom is negative (V−), while the level of the data signal DS is positive (V+)), and each of the first phase and the fourth phase has, for example, 9 frames (the invention is not limited to 9 frames), wherein the frame times of the first phase and the fourth phase in the voltage driving waveform of the same common pixel could be the same or different, and the second phase and the third phase thereof respectively have, for example, 13 frames (the invention is not limited to 13 frames), the timing controller  505  then uses the second lookup table mechanism  505   c  to obtain the pixel voltage waveform and the common voltage driving waveform, as in  FIG. 6B , of each second pixel Px 2  obtained by the timing controller  505  to display the white gray level (gray  15 ), and each of the first to fourth phases has, for example, 13 frame times (the invention is not limited to 13 frames). Apparently, the first pixel voltage waveform and the second pixel voltage waveform have a same waveform phase, and the first common voltage driving waveform and the second common voltage driving waveform have a same waveform phase. Further, the time of the frame (i.e. the fourth phase) displayed by each second pixel Px 2  is greater than the time of the frame displayed by each first pixel Px 1  to compensate for the whiteness. Apparently, the driving device  503  may provide the different source driving waveforms to each first pixel Px 1  and each second pixel Px 2 , and the corresponding common electrode driving waveforms may also be different. Hence, the whiteness, the gamma curve, and the contrast of each second pixel Px 2  are consistent with those of each first pixel Px 1 . 
     In contrast, when the timing controller  505  uses the first lookup table mechanism  505   b  to obtain the pixel voltage driving waveform and the common voltage driving waveform of each first pixel Px 1 , as in  FIG. 6C , to display the black gray level (gray  0 ) (since the level of the common voltage Vcom is positive (V+), while the level of the data signal DS is negative (V−)), and the first phase and the fourth phase respectively have, for example, 9 frames (9 frames are provided for an illustration purpose which are not to be construed as limiting the scope of the invention, and the first phase and the fourth phase could have the same or different numbers of phase), and the second phase and the third phase respectively have, for example, 13 frames (13 frames are provided for an illustration purpose which are not to be construed as limiting the scope of the invention), the timing controller  505  uses the second lookup table mechanism  505   c  to obtain the pixel electrode driving waveform and the common electrode driving waveform of each second pixel Px 2 , as shown in  FIG. 6D , to display the black gray level (gray  0 ). Further, the first phase to the fourth phase respectively include, for example, 13 frames (13 frames are provided for an illustration purpose which are not to be construed as limiting the scope of the invention). It is apparent that the first pixel voltage driving waveform and the second pixel voltage driving waveform have a same waveform phase, and the first common voltage driving waveform and the second common voltage driving waveform also have a same waveform phase. Further, the time of the displayed frame (i.e. the fourth phase) of each second pixel Px 2  is still greater than the time of the displayed frame of each first pixel Px 1  to compensate for the blackness. Apparently, the driving device  503  provides different source driving waveforms to each first pixel Px 1  and each second pixel Px 2 , and the corresponding common electrode driving waveforms are also different. Accordingly, the blackness, the gamma curve, and the contrast of each second pixel Px 2  are consistent with those of each first pixel Px 1 . 
     Alternatively, assuming that the data signal and the common voltage Vcom respectively received by the pixel electrode and the common electrode of each first pixel Px 1  and each second pixel Px 2  are respectively the AC form and the DC form. Further, the pixel voltage driving waveform and the common voltage driving waveform of each first pixel Px 1  and each second pixel Px 2  respectively obtained by the timing controller  505  by using the first look-up table mechanism  505   b  and the second look-up table mechanism  505   c  include four phases, for example, a first phase for executing mechanical balance (which is the normalization of a driving waveform), a second phase and a third phase for executing reset (which is the elimination of a residual image), and a fourth phase of driving pixel (which is the displaying of an image). Each phase includes a plurality of frame times. The voltage driving waveform in this exemplary embodiment is not limited to four phases. For conserving the driving time, the first phase may be further omitted. Hence, the source driving waveform provided by the data line includes at least three phases. 
     Under such a condition, the timing controller  505  uses a first look-up table mechanism  505   b  to obtain the pixel voltage driving waveform and the common voltage driving voltage form of each first pixel Px 1 , as shown in  FIG. 7A , for displaying a white gray level (gray  15 ) (since the level of the data signal DS is positive (V+) and higher than the level of the common voltage Vcom), and the first phase and the fourth phase respectively have nine frames (9 frames are provided for an illustration purpose which are not to be construed as limiting the scope of the invention, and the first phase and the fourth phase could have a same or a different number of phases), and the second phase and the third phase respectively have, for example, 13 frames (13 frames are provided for an illustration purpose which are not to be construed as limiting the scope of the invention), the timing controller  505  uses the second lookup table mechanism  505   c  to obtain the pixel electrode driving waveform of each second pixel Px 2 , as shown in  FIG. 7B , for displaying the white gray level (gray  15 ). Further, the first to the fourth phases respectively include, for example, 13 frames (13 frames are provided for an illustration purpose which are not to be construed as limiting the scope of the invention). It is apparent that the first pixel voltage driving waveform and the second pixel voltage driving waveform have the same waveform phase, and the first common voltage driving waveform and the second common voltage driving waveform have the same waveform phase. Further, the time of the displayed frame of each second pixel Px 2  (the fourth phase) is greater than the time of the displayed frame of each first pixel Px 1  in order to compensate for the whiteness. Apparently, the driving device  530  provides different source driving waveforms to each first pixel Px 1  and each second pixel Px 2 . Moreover, the corresponding common electrode driving waveforms are also different. Accordingly, the whiteness, the gamma curve, and the contrast of each second pixel Px 2  are consistent with those of the first pixel Px 1 . 
     In contrast, when the timing controller  505  uses the first lookup table mechanism  505   b  to obtain the pixel voltage driving waveform and the common voltage driving waveform of each first pixel, as shown in  FIG. 7C  for displaying the black gray level (gray  0 ) (since the level of the data signal DS is negative (V−) and is lower than the level of the common voltage Vcom), and the first phase and the fourth phase respectively include nine frames (9 frames are provided for an illustration purpose which are not to be construed as limiting the scope of the invention, and the first phase and the fourth phase could have a same or a different number of phases), while the second phase and the third phase respectively have, for example, 13 frames (the invention is not limited to 13 frames), the timing controller  505  then uses the second lookup table mechanism  505   c  to obtain the driving waveform of each second pixel Px 2 , as shown in  FIG. 7D , for displaying the black gray level (gray  0 ), and the first phase to the fourth phase respectively have, for example, 13 frames (13 frames are provided for an illustration purpose which are not to be construed as limiting the scope of the invention). Apparently, the first pixel voltage driving waveform and the second pixel voltage driving waveform still have the same waveform phase, and the first common voltage driving waveform and the second common voltage driving waveform have the same waveform phase. Further, the time of the displayed frame of each second pixel Px 2  (the fourth phase) is greater than the time of the displayed image of each first pixel (the fourth phase) to compensate for the blackness. Evidently, the driving device  503  provides different source driving waveforms to each first pixel Px 1  and each second pixel Px 2 . Moreover, the corresponding common electrode driving waveforms are also different. Accordingly, the blackness, the gamma curve, and the contrast of each second pixel Px 2  are consistent with those of the first pixel Px 1 . 
     However, in other exemplary embodiments of the invention, the time for the driving device  503  to drive each second pixel Px 2  during the driving time by using the second lookup table mechanism  505   c  may be equal to the time for the driving device  503  to drive each first pixel Px 1  by using the first lookup table mechanism  505   b . In this case, the driving waveform of each first second pixel Px 2  driven by the display device  503  during time of displaying one frame by using the second lookup table mechanism  505   c  would be different from the driving waveform of each first pixel Px 1  driven by the driving device  503  during the time of displaying one frame by using the first lookup table mechanism  505   b . In other words, the first pixel voltage driving waveform and the second pixel voltage driving waveform have different waveform phases, while the first common voltage driving waveform and the second voltage driving waveform have the same waveform phase. 
     Similarly, the timing controller  505  still uses the first lookup table mechanism  505   b  to obtain the pixel voltage driving waveform and the common voltage driving waveform of each first pixel Px 1  for controlling the source driver  509  and the common electrode driving unit  511  to drive each first pixel Px 1 . The timing controller  505  also uses the second lookup table mechanism  505   c  to obtain the pixel voltage driving waveform and the common voltage driving waveform of each second pixel Px 2  for controlling the source driver  509  and the common electrode driving unit  511  to drive each second pixel Px 2 . 
     Assuming the data signal DS and the common voltage Vcom respectively received by the pixel electrode and the common electrode of each first pixel Px 1  and each second pixel Px 2  are the AC form. Moreover, the pixel voltage driving waveform and the common voltage driving waveform of each first pixel Px 1  and each second pixel Px 2 , respectively obtained by the timing controller  505  by using the first lookup table mechanism  505   b  and the second lookup table mechanism  505   c , have four phases, for example, a first phase for executing mechanical balance (which is the normalization of a driving waveform), a second phase and a third phase for executing reset (which is the elimination of a residual image), and a fourth phase of driving pixel (which is the displaying of an image). Each phase includes a plurality of frame times. 
     Under such a condition, when the timing controller  505  uses a first lookup table mechanism  505   b  to obtain the pixel voltage driving waveform and the common voltage driving voltage waveform of each first pixel Px 1 , as in  FIG. 8A , from a white gray level to white gray level (gray  15 →gray  15 , which is a do-nothing), the timing controller uses the second lookup table mechanism  505   c  to obtain the pixel voltage driving waveform and the common voltage driving waveform of each second pixel Px 2 , as in  FIG. 8B , to change the voltage difference between the data signal DS and the common voltage Vcom at the first phase and the fourth phase in order to enhance the driving of the white at the fourth phase. Accordingly, the first pixel voltage driving waveform and the second pixel voltage driving waveform have different waveform phases, and the first common voltage driving waveform and the second common voltage driving waveform have the same waveform phase. Further, although the time of the driving period of each second pixel Px 2  is equal to the time of the driving period of each first pixel Px 1 , the driving waveform of the driving period of each second pixel Px 2  is different from the driving waveform of the driving period of each first pixel Px 1  to compensate for the whiteness. Apparently, the driving device  503  provides different source driving waveforms to each first pixel Px 1  and each second pixel Px 2 . Moreover, the corresponding common electrode driving waveforms are also different. Accordingly, the whiteness, the gamma curve, and the contrast of each second pixel Px 2  are consistent with those of the first pixel Px 1 . 
     In contrast, when the timing controller  505  uses a first lookup table mechanism  505   b  to obtain the pixel voltage driving waveform and the common voltage driving voltage waveform of each first pixel Px 1 , as in  FIG. 8C , from a black gray level to black gray level (gray  0 →gray  0 , which is a do-nothing), the timing controller  505  uses the second lookup table mechanism  505   c  to obtain the pixel voltage driving waveform and the common voltage driving waveform of each second pixel Px 2 , as in  FIG. 8D , to change the voltage difference between the data signal DS and the common voltage Vcom at the first phase and the fourth phase in order to enhance the driving of the black at the fourth phase. Accordingly, the first pixel voltage driving waveform and the second pixel voltage driving waveform still have different waveform phases, and the first common voltage driving waveform and the second common voltage driving waveform also have different waveform phases. Further, although the time of the driving period of each second pixel Px 2  is equal to the time of the driving period of each first pixel Px 1 , the driving waveform of the driving period of each second pixel Px 2  is different from the driving waveform of the driving period of each first pixel Px 1  to compensate for the blackness. Apparently, the driving device  503  provides different source driving waveforms to each first pixel Px 1  and each second pixel Px 2 , and the corresponding common electrode driving waveforms are also different. Accordingly, the blackness, the gamma curve, and the contrast of each second pixel Px 2  are consistent with those of the first pixel Px 1 . 
     Assuming the data signal D 2  and the common voltage Vcom respectively received by the pixel electrode of each first pixel Px 1  and each second pixel Px 2  are respectively the AC form and the DC form. Moreover, the pixel voltage driving waveform and the common voltage driving waveform of each first pixel Px 1  and each second pixel Px 2 , respectively obtained by the timing controller  505  using the first lookup table mechanism  505   b  and the second lookup table mechanism  505   c , have four phases, for example, a first phase for executing mechanical balance (which is the normalization of a driving waveform), a second phase and a third phase for executing reset (which is the elimination of a residual image), and a fourth phase of driving pixel (which is the displaying of an image). Each phase includes a plurality of frame times. The voltage driving waveform in this exemplary embodiment is not limited to four phases. To conserve the driving time, the first phase may be further omitted. Hence, the source driving waveform provided by the data line includes at least three phases. 
     Under such a condition, when the timing controller  505  uses a first lookup table mechanism  505   b  to obtain the pixel voltage driving waveform and the common voltage driving voltage waveform of each first pixel Px 1 , as in  FIG. 9A , from a white gray level to white gray level (gray  15 →gray  15 , which is a do-nothing), the timing controller  505  uses the second lookup table mechanism  505   c  to obtain the pixel voltage driving waveform and the common voltage driving waveform of each second pixel Px 2 , as in  FIG. 9B , to change the voltage difference between the data signal DS and the common voltage Vcom at the first phase and the fourth phase in order to enhance the driving of the white at the fourth phase. Accordingly, the first pixel voltage driving waveform and the second pixel voltage driving waveform have different waveform phases, and the first common voltage driving waveform and the second common voltage driving waveform have the same waveform phase. Further, although the time of the driving period of each second pixel Px 2  is equal to the time of the driving period of each first pixel Px 1 , the driving waveform of the driving period of each second pixel Px 2  is different from the driving waveform of the driving period of each first pixel Px 1  to compensate for the whiteness. Apparently, the driving device  503  provides different source driving waveforms to each first pixel Px 1  and each second pixel Px 2 . Accordingly, the whiteness, the gamma curve, and the contrast of each second pixel Px 2  are consistent with those of the first pixel Px 1 . 
     In contrast, when the timing controller  505  uses a first lookup table mechanism  505   b  to obtain the pixel voltage driving waveform and the common voltage driving voltage waveform of each first pixel Px 1 , as in  FIG. 9C , from a black gray level to black gray level (gray  0 →gray  0 , which is a do-nothing), the timing controller  505  uses the second lookup table mechanism  505   c  to obtain the pixel voltage driving waveform and the common voltage driving waveform of each second pixel Px 2 , as in  FIG. 9D , to change the voltage difference between the data signal DS and the common voltage Vcom at the first phase and the fourth phase in order to enhance the driving of the black at the fourth phase. Accordingly, the first pixel voltage driving waveform and the second pixel voltage driving waveform have different waveform phases, and the first common voltage driving waveform and the second common voltage driving waveform have the same waveform phase. Further, although the time of the driving period of each second pixel Px 2  is equal to the time of the driving period of each first pixel Px 1 , the driving waveform of the driving period of each second pixel Px 2  is different from the driving waveform of the driving period of each first pixel Px 1  to compensate for the blackness. Apparently, the driving device  503  provides different source driving waveforms to each first pixel Px 1  and each second pixel Px 2 . Accordingly, the blackness, the gamma curve, and the contrast of each second pixel Px 2  are consistent with those of the first pixel Px 1 . 
     According to the exemplary embodiments and the above disclosure,  FIG. 10  illustrates the process flow of the driving method of a bistable display panel according to an exemplary embodiment of the disclosure. Referring to  FIG. 10 , the driving method of this exemplary embodiment is suitable for a bistable display panel applying a half source driving (HSD) panel structure. Alternatively speaking, the bistable display panel includes a plurality of common pixels arranged in an array, and each common pixel includes a first pixel and a second pixel. Further, these two pixels commonly share a data line. Accordingly, the driving method of this exemplary embodiment includes providing at least two different types of lookup table mechanisms (step S 1001 ) to obtain different source driving waveforms, and using the different source driving waveforms obtained from these two different types of lookup table mechanisms to respectively drive the two pixels in each common pixel (S 1003 ). 
     In this exemplary embodiment the two different types of lookup table mechanisms in step S 1001  may include a first lookup table mechanism and a second lookup table mechanism, wherein the first lookup table mechanism is formed with the first pixel voltage driving waveform and the first common voltage driving waveform of the first pixel, and the second lookup table mechanism is formed with the second pixel voltage driving waveform and the second common voltage driving waveform of the second pixel. Moreover, each first pixel is driven earlier than each second pixel. 
     Similarly, under the condition that the first and the second pixels in each common pixel achieve the same pixel gray level, a time to drive each second pixel by using the second lookup table mechanism during a time period of displaying a frame is greater than a time to drive each first pixel by using the first lookup table mechanism during the time period of displaying the frame (i.e. a frame time period). Under such a condition, the first pixel voltage driving waveform and the second pixel voltage driving waveform may have the same waveform phase, and the first common voltage driving waveform and the second common voltage driving waveform may have the same waveform phase. 
     Alternatively, a time to drive the second pixel by using the second lookup table mechanism during a time period of displaying a frame is equal to a time to drive the first pixel by using the first lookup table mechanism during the time period of displaying the frame (i.e. a frame time period). Further, the first pixel voltage driving waveform and the second pixel voltage driving waveform may have different waveform phases, and the first common voltage driving waveform and the second common voltage driving waveform may have the same waveform phase (in other words, the driving waveform of each second pixel driven by using the second lookup table during the time period for displaying a frame (i.e. a frame time period) could be different from the driving waveform of each first pixel driven by the first lookup table during the time period for displaying a frame (i.e. a frame time period)). 
     Regardless of which approach is being used to drive each first pixel and each second pixel, under the condition that the first and the second pixel in each common pixel achieve the same pixel level, the whiteness/blackness, the gamma curve, and the contrast of each second pixel are substantially consistent with those of the first pixel. On the other hand, the data signal and the common voltage respectively received by the pixel electrode and the common electrode of each first pixel and each second pixel may be AC form or may be respectively AC form and DC form, depending on the actual design requirements. 
     According to the exemplary embodiments of the invention, two different types of lookup table mechanisms are applied to respectively obtain the driving waveform of each pixel in an HSD bistable display panel, which is different from the conventional approach of using a single lookup table mechanism, to compensate the latter driven pixel in the two pixels that commonly share a data line. Hence, the driving waveforms of the two pixels that commonly share a data line would be different when displaying a same pixel gray level. Accordingly, under the condition of a same pixel gray level, the illumination (regardless it is whiteness or blackness), the gamma curve, and the contrast of the two pixels commonly sharing a data line will be more consistent to enhance the display quality of the bistable display device. Furthermore, any design, fabrication methods, or any means of applying at least two different types of lookup table mechanisms to respectively drive the pixel in the driving panel (regardless it is for an HSD bistable display panel) fall within the principles of this invention. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.