This application claims the priority benefit of Taiwan application serial no. 102102686, filed on Jan. 24, 2013. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
Technical Field
The invention relates to a planar display technique. Particularly, the invention relates to an electrophoretic display and a method for driving a panel thereof.
Related Art
Generally, an electrophoretic display applies an electrophoretic display technique to achieve an image display effect. Taking a color e-book as an example, each pixel therein is mainly composed of a red electrophoresis solution, a green electrophoresis solution and a blue electrophoresis solution doped with white charged particles and formed in different micro-cups, and a voltage is applied to drive the white charged particles to move, such that each pixel can display a color between the darkest black to the brightest white.
However, the conventional panel driving technique generally has a cross talk phenomenon caused by a capacitive coupling effect. An example is provided below to schematically describe the cross talk phenomenon and an influence thereof.
Therefore, it is an important issue to decrease or avoid the cross talk phenomenon of the display panel generated during the display process.
Accordingly, the invention is directed to a driving method of an electrophoretic display, by which a cross talk problem of the electrophoretic display is mitigated.
The invention provides an electrophoretic display including a display panel and a driving circuit. The display panel includes a plurality of column data lines and a plurality of row scan lines. The driving circuit is coupled to the display panel, and respectively provides a plurality of data driving signals to the column data lines, and respectively provides a plurality of scan signals to the row scan lines. Each of the scan signals has a plurality of scan enable periods, and each of the scan enable periods includes a plurality of scan interval periods. The driving circuit makes each of the scan signals to be floating or grounding during the scan interval periods. Each of the data driving signals includes a plurality of data driving periods, and each of the data driving periods includes a plurality of driving interval periods. The driving circuit makes each of the data driving signals to be floating or grounding during the driving interval periods.
The invention provides a method for driving an electrophoretic display, the electrophoretic display has a display panel, and the display panel includes a plurality of column data lines and a plurality of row scan lines. The method includes following steps. A plurality of data driving signals are respectively provided to the column data lines, and a plurality of scan signals are respectively provided to the row scan lines. Each of the scan signals has a plurality of scan enable periods, and each of the scan enable periods includes a plurality of scan interval periods. Each of the data driving signals includes a plurality of data driving periods, and each of the data driving periods includes a plurality of driving interval periods. Each of the scan signals is floating or grounding during the scan interval periods, and each of the data driving signals is floating or grounding during the driving interval periods.
According to the above descriptions, the invention provides an electrophoretic display and a method for driving a panel thereof, by which the specially designed data driving signals and scan signals are used to drive a plurality of pixels, so as to mitigate the cross talk problem of the display panel and the influence on quality of the display image.
In order to make the aforementioned and other features and advantages of the invention comprehensible, several exemplary embodiments accompanied with figures are described in detail below.
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.
Referring to
In the present embodiment, each of the scan signals SS provided by the driving circuit 230 includes a plurality of scan enable periods, and each of the scan enable periods includes a plurality of scan interval periods. Referring to
It should be noticed that in the scan interval periods TSI of the scan enable periods TA1, TA2 and TA3, the scan signal SS is maintained to be floating. Namely, in the scan interval periods TSI of the scan enable periods TA1, TA2 and TA3, the scan signal SS provided by the driving circuit 230 does not have a driving capability and is in a high impedance state.
Moreover, each of the data driving signals DD includes a plurality of data driving periods, and each of the data driving periods includes a plurality of driving interval periods. Referring to
Referring to
The driving circuit 230 is coupled to the display panel 210, and respectively provides a plurality of data driving signals DD1-DD3 to the column data lines DL1-DL3, and provides a plurality of scan signals SS1-SS3 to the row scan lines SL1-SL3. The data driving signals DD1-DD3 and the scan signals SS1-SS3 can be determined by the display image to be displayed by the display panel 210. For example, when the image to be displayed by the display panel 210 is a black and white interlaced quincunx-type display image as that shown in
In the present embodiment, taking the scan signal SS1 as an example, the scan signal SS1 includes a plurality of scan enable periods TA11-TA13, and the scan enable periods TA11-TA13 of the scan signal SS1 respectively correspond to data driving periods TD11-TD13 of the data driving signals DD1-DD3. The scan signal SS1 is used to control the pixels P411-P413 on the display panel 210, and in the scan enable period TAU, by calculating a negative voltage difference between the scan signal SS1 in the scan enable period TA11 and the corresponding data driving signal DD1 in the data driving period TD11 (which is equivalent to the display reference voltage V1−the display reference V2), it is known that the pixel P411 displays a black pattern.
Referring to
Similarly, by calculating a positive voltage difference and a negative voltage difference between the scan signal SS2 in the scan enable periods TA21-TA23 and the data driving signals DD1-DD3 in the corresponding data driving periods TD21-TD23, the display pattern (black or white) of the pixels P421-P423 is known. Moreover, by calculating a positive voltage difference and a negative voltage difference between the scan signal SS3 in the scan enable periods TA31-TA33 and the data driving signals DD1-DD3 in the corresponding data driving periods TD31-TD33, the display pattern of the pixels P431-P433 is known. It should be noticed that as the operation method of the present embodiment has been described in detail in the aforementioned paragraph, details thereof are not repeated.
It should be noticed that one of the data driving periods TD11-TD13, TD21-TD23 and TD31-TD33 of the data driving signals DD1-DD3 corresponds to one of the scan enable periods TA11-TA13, TA21-TA23 and TA31-TA33 of the scan signals SS1-SS3, and in the corresponding data driving periods TD11-TD13, TD21-TD23 and TD31-TD33 and the scan enable periods TA11-TA13, TA21-TA23 and TA31-TA33, each of the scan interval periods TSI corresponds to each of the driving interval periods TDI.
However, the invention is not limited thereto, in another embodiment of the invention, the driving circuit makes each of the scan signals to be floating or grounding during the scan interval periods.
Referring to
Similar to
In detail, a difference between the present embodiment and the embodiment of
In detail, referring to
Similarly, in periods other than the data driving periods TD11′-TD13′, TD21′-TD23′ and TD31′-TD33′ of the data driving signals DD1′-DD3′, the data driving signals DD1′-DD3′ are all floating. In this way, according to its own signal waveform of each of the data driving signals DD1′-DD3′, patterns of the pixels P411-P413, P421-P423 and P431-P433 can be directly obtained (for example, the pixels P411 and P413 display black, and the pixel P412 displays white, etc.), and meanwhile the cross talk phenomenon of the display panel can be effectively mitigated through potential floating.
It should be noticed that enough instructions and recommendations of the aforementioned embodiments can be learned for the above method, and details thereof are not repeated.
In summary, the invention provides an electrophoretic display and a driving method thereof, by which when the driving circuit drives a plurality of pixels in the display panel, by adding the driving interval periods to the data driving periods of the data driving signal, and adding the scan interval periods to the scan enable periods in the scan signal, the cross talk phenomenon of the display panel is mitigated and display quality is improved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
Number | Date | Country | Kind |
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102102686 A | Jan 2013 | TW | national |
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Number | Date | Country | |
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20140204012 A1 | Jul 2014 | US |