Disclosure of Invention
The invention provides an electronic paper display device and a driving method of a panel thereof, which can reduce the capacitive coupling effect between pixels.
The electronic paper display device of the present invention includes an electronic paper display panel and a display driver. The electronic paper display panel is used for displaying an image (image). The image includes a first frame (frame) and a second frame. The display driver is coupled to the electronic paper display panel. The display driver is used for driving the electronic paper display panel to display images. The display driver drives a first pixel group of the electronic paper display panel with a first polarity during a first frame, and drives a second pixel group of the electronic paper display panel with a second polarity to display the first frame. The first pixel group and the second pixel group are arranged in a staggered mode. The display driver drives a second pixel group of the electronic paper display panel with a first polarity during a second frame to display the second frame.
In an embodiment of the invention, the display driver does not drive the first pixel group of the electronic paper display panel during the second frame period to display the second frame.
In an embodiment of the invention, the display driver drives the electronic paper display panel to display the first frame according to the first polarity array during the first frame. The pixels of the first polarity array comprise a first polarity and a second polarity. The display driver drives the electronic paper display panel to display a second frame according to the second polarity array during the second frame. The pixels of the second polarity array include a first polarity and a zero polarity. The zero polarity indicates that the display driver does not drive the first pixel group of the electronic paper display panel during the second frame.
In an embodiment of the invention, the first pixel group is an odd pixel line (line) of the electronic paper display panel, and the second pixel group is an even pixel line of the electronic paper display panel.
In an embodiment of the invention, the first pixel group is an odd pixel row (column) of the e-paper display panel, and the second pixel group is an even pixel row of the e-paper display panel.
In an embodiment of the invention, the first pixel group includes a plurality of first pixels, and the second pixel group includes a plurality of second pixels. The upper, lower, left and right of each first pixel are second pixels, and the upper, lower, left and right of each second pixel are first pixels.
The driving method of the electronic paper display panel is used for driving the electronic paper display panel to display images. The image comprises a first picture frame and a second picture frame, and the driving method comprises the following steps: driving a first pixel group of the electronic paper display panel with a first polarity and a second pixel group of the electronic paper display panel with a second polarity during a first frame to display the first frame; and driving a second pixel group of the electronic paper display panel with the first polarity during a second frame to display the second frame. The first pixel group and the second pixel group are arranged in a staggered mode.
In an embodiment of the present invention, the driving the first pixel group of the e-paper display panel with the first polarity and the driving the second pixel group of the e-paper display panel with the second polarity during the first frame to display the first frame includes: the electronic paper display panel is driven to display a first frame according to the first polarity array during the first frame. The pixels of the first polarity array comprise a first polarity and a second polarity.
In an embodiment of the invention, the step of driving the second pixel group of the electronic paper display panel with the first polarity during the second frame to display the second frame includes: and driving the electronic paper display panel to display a second frame according to the second polarity array during the second frame. The pixels of the second polarity array comprise a first polarity.
In an embodiment of the invention, the driving method of the electronic paper display panel further includes not driving the first pixel group of the electronic paper display panel during the second frame period to display the second frame.
In an embodiment of the invention, the step of not driving the first pixel group of the electronic paper display panel during the second frame period to display the second frame includes: and driving the electronic paper display panel to display a second frame according to the second polarity array during the second frame. The pixels of the second polarity array also include a zero polarity. The zero polarity indicates that the display driver does not drive the first pixel group of the electronic paper display panel during the second frame.
In an embodiment of the invention, the first pixel group is an odd pixel row of the electronic paper display panel, and the second pixel group is an even pixel row of the electronic paper display panel.
In an embodiment of the invention, the first pixel group is an odd pixel row of the electronic paper display panel, and the second pixel group is an even pixel row of the electronic paper display panel.
In an embodiment of the invention, the first pixel group includes a plurality of first pixels, the second pixel group includes a plurality of second pixels, the upper, lower, left and right of each first pixel are second pixels, and the upper, lower, left and right of each second pixel are first pixels.
Based on the above, in the embodiment of the invention, the adjacent pixels are driven with different polarities to reduce the capacitive coupling effect between the pixels.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
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 shows a schematic view of an electronic paper display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an example of updating a display image of the electronic paper display panel of the embodiment of FIG. 1;
FIG. 3 is a schematic view illustrating a process of updating a display image of an electronic paper display panel according to an embodiment of the present invention;
FIG. 4 is a waveform diagram of signals for driving an electronic paper display panel according to an embodiment of the invention;
FIG. 5 is a schematic view illustrating a process of updating a display image of an electronic paper display panel according to another embodiment of the present invention;
FIG. 6 is a waveform diagram of signals for driving an electronic paper display panel according to another embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating a process of updating a display image of an electronic paper display panel according to another embodiment of the present invention;
fig. 8 is a flowchart illustrating a method for driving an electronic paper display panel according to an embodiment of the invention.
Description of the reference numerals
100 electronic paper display device
110 electronic paper display panel
112. 501, 502 pixels
114 image
114_1, 314_1, 514_1 first frame
114_2, 314_2, 514_2 second frame
116 initial display content
118_1, 318_1, 518_1 first polarity array
118_2, 318_2, 518_2 second polarity array
119_1, 119_2, 319_1, 319_2, 519_1, 519_2 array pixels
120 display driver
201 odd pixel rows
202 even pixel rows
401 odd pixel column
402 even pixel column
S1, S2, S3 drive signals
S100, S110 method step
T is frame period
T1 first frame period
T2 second frame period
VP positive voltage
VN negative voltage
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Fig. 1 is a schematic diagram of an electronic paper display device according to an embodiment of the present invention. Referring to fig. 1, the electronic paper display apparatus 100 of the present embodiment includes an electronic paper display panel 110 and a display driver 120. The electronic paper display panel 110 includes a plurality of pixels 112. The e-paper display panel 110 is used for displaying an image 114. The display driver 120 is coupled to the e-paper display panel 110. The display driver 120 is used for driving the electronic paper display panel 110 to display the image 114. The number of pixels and the image content illustrated in fig. 1 are not intended to limit the present invention.
Fig. 2 is a schematic diagram illustrating an example of updating a display image of the electronic paper display panel according to the embodiment of fig. 1. Fig. 3 is a schematic flow chart illustrating an updating process of a display image of an electronic paper display panel according to an embodiment of the invention. Referring to fig. 1 to fig. 3, the display driver 120 drives the electronic paper display panel 110 to update the display content thereof from the initial display content 116 to the image 114, i.e., the target image. The initial display content 116 of the embodiment is, for example, blank, but is not limited to the invention.
Specifically, in the present embodiment, the image 114 includes a first frame 114_1 and a second frame 114_ 2. The display driver 120 divides the frame periods T1 and T2 into two frame periods to drive the e-paper display panel 110 to display the first frame 114_1 and the second frame 114_2 respectively to update the image 114. The display driver 120 drives the e-paper display panel 110 to display the first frame 114_1 according to the first polarity array 118_1 during the first frame period T1. Then, the display driver 120 drives the e-paper display panel 110 to display a second frame 114_2 according to the second polarity array 118_2 during a second frame period T2, where the second frame 114_2 is a target frame, i.e., an image frame to be displayed on the e-paper display panel 110.
In the present embodiment, the pixel 119_1 of the first polarity array 118_1 includes a first polarity and a second polarity, which are denoted as "+" and "-" in FIG. 3. The first polarity, labeled "+" indicates that the display driver 120 drives the corresponding pixels of the e-paper display panel 110 with the same voltage polarity as the target frame, i.e., in the same direction. The second polarity, denoted as "-", indicates that the display driver 120 drives the corresponding pixels on the e-paper display panel 110 with a different voltage polarity from the target frame, i.e., in a reverse driving or in a different driving direction. Pixel 119_2 of second polarity array 118_2 includes a first polarity and a zero polarity, which is labeled "0" in FIG. 3. A polarity of zero, labeled "0", indicates that the display driver 120 does not drive the corresponding pixel on the e-paper display panel 110.
For example, during the first frame period T1, the display driver 120 drives the odd pixel rows 201 (the first pixel group) of the e-paper display panel 110 with the first polarity and drives the even pixel rows 202 (the second pixel group) of the e-paper display panel 110 with the second polarity according to the first polarity array 118_1 to display the first frame 114_ 1. During the first frame period T1, since the display driver 120 drives the odd pixel rows 201 of the e-paper display panel 110 with the first polarity, the odd pixel rows 201 of the first frame 114_1 and the odd pixel rows 201 of the target image 114 display the same image content, for example: the same color. On the contrary, during the first frame period T1, since the display driver 120 drives the even pixel rows 202 of the e-paper display panel 110 with the second polarity, the even pixel rows 202 of the first frame 114_1 and the even pixel rows 202 of the target image 114 display opposite image contents, such as: the opposite color.
Then, during the second frame period T2, the display driver 120 does not drive the odd pixel rows 201 of the e-paper display panel 110 according to the second polarity array 118_2, but drives the even pixel rows 202 of the e-paper display panel 110 with the first polarity to display the second frame 114_ 2. In the second frame period T2, since the display driver 120 does not drive the odd pixel rows 201 of the electronic paper display panel 110, the image content displayed on the odd pixel rows 201 of the second frame 114_2 remains unchanged, and the same image content is displayed on the target image 114 and the odd pixel rows 201 of the first frame 114_ 1. During the second frame period T2, since the display driver 120 drives the even pixel rows 202 of the e-paper display panel 110 with the first polarity, the even pixel rows 202 of the second frame 114_2 and the even pixel rows 202 of the first frame 114_1 display opposite image contents, but display the same image contents as the even pixel rows 202 of the target image 114.
In the present embodiment, the first pixel group is an odd pixel row 201 of the e-paper display panel 110, and the second pixel group is an even pixel row 202 of the e-paper display panel 110, which are staggered in the vertical direction. For the e-paper display panel 110, the display driver 120 drives the e-paper display panel 110 to display the image 114 by using a vertical interlace (interlace) image driving method, which is divided into two frame periods T1 and T2. When the display driver 120 drives the e-paper display panel 110 to display the first frame 114_1, the odd pixel rows 201 are driven in the forward direction, and the even pixel rows 202 are driven in the reverse direction, as shown in the first polarity array 118_ 1. Then, when the display driver 120 drives the e-paper display panel 110 to display the second frame 114_2, the even pixel rows 202 are driven in the forward direction, and the odd pixel rows 201 are not driven, as shown in the second polarity array 118_ 2. By using the above driving method, that is, the adjacent pixels are driven with different polarities, the capacitive coupling effect between the pixels on the e-paper display panel 110 can be reduced.
Fig. 4 is a waveform diagram of signals for driving an electronic paper display panel according to an embodiment of the invention, and please refer to fig. 4, in which a horizontal axis represents time and a vertical axis represents voltage. The driving signals S1 and S2 are waveforms for driving the odd pixel rows 201 and the even pixel rows 202 during consecutive frame periods T, respectively. During the consecutive frame period T, the odd pixel rows 201 are driven with the positive voltage VP, and the even pixel rows 202 are driven with the negative voltage VN, as shown in the first polarity array 118_ 1. Since the adjacent pixel rows are driven by voltages with different polarities, the capacitive coupling effect between the pixel rows on the e-paper display panel 110 may be reduced.
Fig. 5 is a schematic flow chart illustrating an updating of a display image of an electronic paper display panel according to another embodiment of the present invention. Referring to fig. 5, the display driver 120 of the present embodiment drives the e-paper display panel 110, and drives the e-paper display panel 110 to display the image 114 by using a horizontal interlaced image driving method, which is divided into two frame periods T1 and T2, so that the display content of the image 114 is updated from the initial display content 116 to the image 114, as shown in fig. 2.
Specifically, in the present embodiment, the image 114 includes a first frame 314_1 and a second frame 314_ 2. The display driver 120 divides the two frame periods T1 and T2 to drive the electronic paper display panel 110 to display the first frame 314_1 and the second frame 314_2 respectively to update the image 114. The display driver 120 drives the e-paper display panel 110 to display the first frame 314_1 according to the first polarity array 318_1 during the first frame period T1. Then, the display driver 120 drives the e-paper display panel 110 to display the second frame 314_2 according to the second polarity array 318_2 during the second frame period T2.
In the present embodiment, the pixel 319_1 of the first polarity array 318_1 comprises a first polarity and a second polarity, which are denoted as "+" and "-" in FIG. 5, respectively. Pixel 319_2 of second polarity array 318_2 includes a first polarity and a zero polarity, which is labeled "0" in FIG. 5.
For example, during the first frame period T1, the display driver 120 drives the odd pixel rows 401 (the first pixel group) of the e-paper display panel 110 with the first polarity and drives the even pixel rows 402 (the second pixel group) of the e-paper display panel 110 with the second polarity according to the first polarity array 318_1 to display the first frame 314_ 1. During the first frame period T1, since the display driver 120 drives the odd pixel rows 401 of the e-paper display panel 110 with the first polarity, the odd pixel rows 401 of the first frame 314_1 and the odd pixel rows 401 of the target image 114 display the same image content. In contrast, during the first frame period T1, since the display driver 120 drives the even pixel rows 402 of the e-paper display panel 110 with the second polarity, the even pixel rows 402 of the first frame 314_1 and the even pixel rows 402 of the target image 114 display opposite image contents.
Then, during the second frame period T2, the display driver 120 does not drive the odd pixel rows 401 of the e-paper display panel 110 according to the second polarity array 318_2, but drives the even pixel rows 402 of the e-paper display panel 110 with the first polarity to display the second frame 314_ 2. In the second frame period T2, since the display driver 120 does not drive the odd pixel rows 401 of the electronic paper display panel 110, the image content displayed by the odd pixel rows 401 of the second frame 314_2 remains unchanged, and the same image content is displayed by the target image 114 and the odd pixel rows 401 of the first frame 314_ 1. In the second frame period T2, since the display driver 120 drives the even pixel rows 402 of the e-paper display panel 110 with the first polarity, the even pixel rows 402 of the second frame 314_2 and the even pixel rows 402 of the first frame 314_1 display opposite image contents, but display the same image contents as the even pixel rows 402 of the target image 114.
In the present embodiment, the first pixel group is an odd pixel row 401 of the electronic paper display panel 110, and the second pixel group is an even pixel row 402 of the electronic paper display panel 110, which are alternately arranged in the horizontal direction. For the e-paper display panel 110, the display driver 120 drives the e-paper display panel 110 to display the image 114 by dividing the horizontal interlaced image driving method into two frame periods T1 and T2. When the display driver 120 drives the e-paper display panel 110 to display the first frame 314_1, the odd pixel row 401 is driven in the forward direction, and the even pixel row 402 is driven in the reverse direction, as shown in the first polarity array 318_ 1. Then, when the display driver 120 drives the e-paper display panel 110 to display the second frame 314_2, the even pixel row 402 is driven in the forward direction, and the odd pixel row 401 is not driven, as shown in the second polarity array 318_ 2. By using the driving method, the capacitive coupling effect between the pixels on the e-paper display panel 110 can be reduced.
Fig. 6 is a schematic diagram showing waveforms of signals for driving an electronic paper display panel according to another embodiment of the present invention, referring to fig. 6, wherein the horizontal axis represents pixels and the vertical axis represents voltages. The driving signal S3 is, for example, a signal waveform for driving adjacent pixels on the same pixel column during the same frame. During the same frame, the odd pixel row 401 is driven by the positive voltage VP, and the even pixel row 402 is driven by the negative voltage VN, as shown in the first polarity array 318_ 1. Since the adjacent pixel columns are driven by voltages with different polarities, the capacitive coupling effect between the pixel columns on the e-paper display panel 110 can be reduced.
Fig. 7 is a schematic flow chart illustrating an updating of a display image of an electronic paper display panel according to another embodiment of the present invention. Referring to fig. 7, the display driver 120 of the present embodiment drives the e-paper display panel 110, and drives the e-paper display panel 110 to display the image 114 by using a dot-interleaved image driving method, which is divided into two frame periods T1 and T2, so that the display content of the image 114 is updated from the initial display content 116 to the image 114, as shown in fig. 2.
Specifically, in the present embodiment, the image 114 includes a first frame 514_1 and a second frame 514_ 2. The display driver 120 divides the frame periods T1 and T2 into two frame periods to drive the e-paper display panel 110 to display the first frame 514_1 and the second frame 514_2 respectively to update the image 114. The display driver 120 drives the e-paper display panel 110 to display the first frame 514_1 according to the first polarity array 518_1 during the first frame period T1. Then, the display driver 120 drives the e-paper display panel 110 to display the second frame 514_2 according to the second polarity array 518_2 during the second frame period T2.
In the present embodiment, the pixel 519_1 of the first polarity array 518_1 includes a first polarity and a second polarity, which are denoted as "+" and "-" in FIG. 7, respectively. The pixels 519_1 labeled "+" and the pixels 519_1 labeled "-" are staggered in a checkerboard fashion across the first polarity array 518_ 1. That is, the pixel 519_1 denoted by "+" has a pixel 519_1 denoted by "-" at the top, bottom, left, and right, and the pixel 519_1 denoted by "-" has a pixel 519_1 denoted by "+" at the top, bottom, left, and right.
The pixels 519_1 labeled "+" in the first polarity array 518_1 are used to drive a first group of pixels, and the pixels 519_1 labeled "-" in the first polarity array 518_1 are used to drive a second group of pixels. The first pixel group includes a plurality of first pixels 501, and the second pixel group includes a plurality of second pixels 502. The upper, lower, left, and right of the first pixel 501 are the second pixels 502, and the upper, lower, left, and right of the second pixels 502 are the first pixels 501. That is, the first pixel group and the second pixel group are staggered on the electronic paper display panel 110 in a checkerboard manner.
The pixel 519_2 of the second polarity array 518_2 includes a first polarity and a zero polarity, which is labeled "0" in FIG. 7. The pixels 519_2 labeled "0" are interleaved with the pixels 519_2 labeled "+" on the second polarity array 518_2 in a checkerboard fashion. The pixel 519_2 labeled "0" in the second polarity array 518_2 is used to drive a first group of pixels, and the pixel 519_2 labeled "+" in the second polarity array 518_2 is used to drive a second group of pixels.
For example, during the first frame period T1, the display driver 120 drives a first pixel group of the e-paper display panel 110 with a first polarity and drives a second pixel group of the e-paper display panel 110 with a second polarity according to the first polarity array 518_1 to display the first frame 514_ 1. During the first frame period T1, since the display driver 120 drives the first pixel group of the e-paper display panel 110 with the first polarity, the first pixel group of the first frame 514_1 and the first pixel group of the target image 114 display the same image content. In contrast, during the first frame period T1, since the display driver 120 drives the second pixel group of the e-paper display panel 110 with the second polarity, the second pixel group of the first frame 514_1 and the second pixel group of the target image 114 display opposite image contents.
Then, during the second frame period T2, the display driver 120 does not drive the first pixel group of the e-paper display panel 110 according to the second polarity array 518_2, but drives the second pixel group of the e-paper display panel 110 with the first polarity to display the second frame 514_ 2. In the second frame period T2, since the display driver 120 does not drive the first pixel group of the e-paper display panel 110, the content of the image displayed by the first pixel group of the second frame 514_2 remains unchanged, and the same content of the image is displayed by the target image 114 and the first pixel group of the first frame 514_ 1. During the second frame period T2, since the display driver 120 drives the second pixel group of the electronic paper display panel 110 with the first polarity, the second pixel group of the second frame 514_2 and the second pixel group of the first frame 514_1 display opposite image contents, but display the same image contents as the second pixel group of the target image 114.
In the present embodiment, the first pixel group and the second pixel group are staggered on the electronic paper display panel 110 in a checkerboard manner. For the e-paper display panel 110, the display driver 120 drives the e-paper display panel 110 to display the image 114 by dividing the image into two frame periods T1 and T2 by using a dot-interleaved image driving method. When the display driver 120 drives the e-paper display panel 110 to display the first frame 514_1, the first pixel group is driven in the forward direction, and the second pixel group is driven in the reverse direction, as shown in the first polarity array 518_ 1. Then, when the display driver 120 drives the e-paper display panel 110 to display the second frame 514_2, the second pixel group is driven in the forward direction, and the first pixel group is not driven, as shown by the second polarity array 518_ 2. By using the driving method, the capacitive coupling effect between the pixels on the e-paper display panel 110 can be reduced.
Fig. 8 is a flowchart illustrating a method for driving an electronic paper display panel according to an embodiment of the invention. Referring to fig. 1 and fig. 8, the driving method of the present embodiment is at least applicable to the electronic paper display apparatus 100 of fig. 1, but the present invention is not limited thereto. Taking the e-paper display apparatus 100 of fig. 1 as an example, in step S100, the display driver 120 drives a first pixel group of the e-paper display panel 110 with a first polarity and drives a second pixel group of the e-paper display panel 110 with a second polarity during a first frame period T1 to display the first frame. In step S110, the display driver 120 drives the second pixel group of the electronic paper display panel 110 with the first polarity during the second frame to display the second frame. In addition, the driving method of the electronic paper display panel according to the embodiment of the invention can be obtained from the description of the embodiments of fig. 1 to 7 to obtain sufficient teaching, suggestion and implementation description.
In summary, in the embodiments of the invention, the display driver may use a vertical-interleaving, horizontal-interleaving or dot-interleaving image driving method to drive the electronic paper display panel to display the target image in two frame periods. Therefore, the adjacent pixels driven with different polarities can reduce the capacitive coupling effect between the pixels.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.