CN106935169B - Electronic paper display device and driving method thereof - Google Patents

Abstract

The present invention provides an electronic paper display device and a driving method thereof, wherein the electronic paper display device comprises an electronic paper display panel, a display driver and a data processor. The electronic paper display panel is used to display an image page. The display driver is coupled to the electronic paper display panel. The display driver is used to drive the electronic paper display panel to display multiple image frames according to image data to display the image page. The data processor is coupled to the display driver. The data processor is used to convert a first lookup table into a second lookup table, and to merge a current frame and a previous frame into an integrated frame. The data processor generates image data according to the integrated frame and the second lookup table, and outputs the image data to the display driver. The image frame includes a current frame and a previous frame. Therefore, the data processing performance can be improved.

Description

Electronic paper display device and driving method thereof

technical field

The present invention relates to a display apparatus and a driving method thereof, in particular to an electro-phoretic display apparatus and a driving method thereof.

Background technique

The electronic paper display device is a new type of display device with high color contrast, high resolution, low power consumption and low manufacturing cost. In recent years, as the display device gradually begins to develop in the direction of lightness and thinness, the electronic paper display device has become a display device that meets the needs of the public. Electronic paper display devices have been widely used in e-readers (eg, e-books, e-newspapers) or other electronic components (eg, electronic tags) due to their advantages of being light, thin, durable, and energy-saving, environmentally friendly, and low in power consumption.

Generally speaking, driving an electronic paper display device to display an image frame usually requires obtaining the relationship between the grayscale changes of each pixel in the current frame and the previous frame, so as to select corresponding digital data to drive the electronic paper display panel. However, in the prior art, the data processor can usually only obtain the relationship between the grayscale changes of a single pixel in the current picture and the previous picture at a time. In addition, the data processor obtains the digital data by corresponding to the gray level of a single pixel in the previous picture corresponding to the gray level of a single pixel in the current picture, so as to obtain the gray level change. The data processor selects the corresponding digital data according to the gray scale change. Therefore, the data processing performance of such a driving method of an electronic paper display device is low and lacks competitiveness.

SUMMARY OF THE INVENTION

The present invention provides an electronic paper display device and a driving method thereof, which can improve data processing efficiency.

The electronic paper display device of the present invention includes an electronic paper display panel, a display driver and a data processor. The electronic paper display panel is used to display image pages. 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 a plurality of image frames according to the image data to display image pages. The data processor is coupled to the display driver. The data processor is used for converting the first lookup table into the second lookup table, and merging the current picture and the previous picture into an integrated picture. The data processor generates image data according to the integrated frame and the second lookup table, and outputs the image data to the display driver. The image picture includes the current picture and the previous picture.

In an embodiment of the present invention, the above-mentioned electronic paper display device further includes a storage device. The storage device is coupled to the data processor. The storage device is used for storing the first look-up table, the second look-up table, the current picture, the previous picture and the integrated picture.

In an embodiment of the present invention, the above-mentioned first look-up table includes a correspondence between the first gray-scale digital code combination of a plurality of pixels in the previous picture and the second gray-scale digital code combination of the pixels in the current picture. The second lookup table includes the correspondence between a plurality of addresses and the third gray-scale digital code combination of the pixels in the integrated picture. The third gray-scale digital code combination includes the first gray-scale digital code combination and the second gray-scale digital code combination.

In an embodiment of the present invention, the above-mentioned data processor searches for the third gray-scale digital code combination of the pixels in the integrated frame according to the address, so as to generate image data. The image data includes a third grayscale digital code combination.

In an embodiment of the present invention, the above-mentioned current picture includes a plurality of current pixel rows, and the previous picture includes a plurality of previous pixel rows. In the integrated picture, the current pixel row and the previous pixel row are staggered.

In an embodiment of the present invention, the above-mentioned integrated picture includes a plurality of integrated pixel rows, and the previous pixel row is arranged in an odd-numbered integrated pixel row among the integrated pixel rows. The current pixel row is arranged in the even-numbered integrated pixel row among the integrated pixel rows.

In an embodiment of the present invention, the above-mentioned integrated picture includes a plurality of integrated pixel rows, and the current pixel row is arranged in an odd-numbered integrated pixel row among the integrated pixel rows. The previous pixel row is arranged in the even-numbered integrated pixel row among the integrated pixel rows.

The driving method of the electronic paper display device of the present invention includes: converting the first look-up table into a second look-up table, and merging the current picture and the previous picture into an integrated picture; generating image data according to the integrated picture and the second look-up table; and The electronic paper display panel is driven to display a plurality of image frames according to the image data, so as to display image pages. The image picture includes the current picture and the previous picture. The electronic paper display device includes an electronic paper display panel.

In an embodiment of the present invention, the above-mentioned driving method of an electronic paper display device further includes: storing the first lookup table, the second lookup table, the current picture, the previous picture and the integrated picture in the storage device. The electronic paper display device includes a storage device.

In an embodiment of the present invention, the above-mentioned first look-up table includes a correspondence between the first gray-scale digital code combination of a plurality of pixels in the previous picture and the second gray-scale digital code combination of the pixels in the current picture. The second lookup table includes the correspondence between a plurality of addresses and the third gray-scale digital code combination of the pixels in the integrated picture. The third gray-scale digital code combination includes the first gray-scale digital code combination and the second gray-scale digital code combination.

In an embodiment of the present invention, in the step of generating image data according to the integrated picture and the second lookup table, the third grayscale digital code combination of pixels in the integrated picture is searched according to the address to generate the image data. The image data includes a third grayscale digital code combination.

In an embodiment of the present invention, the above-mentioned current picture includes a plurality of current pixel rows, and the previous picture includes a plurality of previous pixel rows. In the integrated picture, the current pixel row and the previous pixel row are staggered.

In an embodiment of the present invention, the above-mentioned integrated picture includes a plurality of integrated pixel rows, and the previous pixel row is arranged in an odd-numbered integrated pixel row among the integrated pixel rows. The current pixel row is arranged in the even-numbered integrated pixel row among the integrated pixel rows.

In an embodiment of the present invention, the above-mentioned integrated picture includes a plurality of integrated pixel rows, and the current pixel row is arranged in an odd-numbered integrated pixel row among the integrated pixel rows. The previous pixel row is arranged in the even-numbered integrated pixel row among the integrated pixel rows.

Based on the above, in the exemplary embodiment of the present invention, the data processor of the electronic paper display device generates image data according to the integrated screen and the second lookup table, which can improve data processing performance.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

Description of drawings

FIG. 1 is a schematic block diagram of an electronic paper display device according to an embodiment of the present invention;

FIG. 2 is a schematic schematic diagram of merging different image frames according to an embodiment of the present invention;

3 is a schematic diagram of a first lookup table according to an embodiment of the present invention;

4 is a schematic diagram of a second lookup table according to an embodiment of the present invention;

FIG. 5 is a schematic schematic diagram of merging different image frames according to another embodiment of the present invention;

FIG. 6 is a flowchart of steps of a driving method of an electronic paper display device according to an embodiment of the present invention.

Description of reference numbers:

100: electronic paper display device;

110: electronic paper display panel;

120: Display driver;

130: data processor;

140: storage device;

200: integrated screen;

500A: The first integrated screen;

500B: the second integrated screen;

202, 502A, 502B: Integrate pixel rows;

210: previous screen;

212, 512, 522: previous pixel row;

220: the current screen;

222, 522, 532: the current pixel row;

300: the first lookup table;

400: the second lookup table;

510: the first image frame;

520: the second image frame;

530: the third image screen;

DD: Image data.

Detailed ways

A number of embodiments are presented below to illustrate the present invention, however, the present invention is not limited to the exemplified embodiments. Appropriate combinations are also permitted between embodiments. As used throughout this specification (including the claims), the term "coupled" may refer to any direct or indirect means of connection. For example, if it is described in the text that a first device is coupled to a second device, it should be interpreted that the first device can be directly connected to the second device, or the first device can be connected to the second device through other devices or some connection means. Indirectly connected to the second device. Furthermore, the term "signal" may refer to at least one current, voltage, charge, temperature, data, electromagnetic wave, or any other signal or signals.

FIG. 1 is a schematic block diagram of an electronic paper display device according to an embodiment of the present invention. Referring to FIG. 1 , the electronic paper display device 100 of this embodiment includes an electronic paper display panel 110 , a display driver 120 , a data processor 130 and a storage device 140 . In this embodiment, the storage device 140 is coupled to the data processor 130 , the data processor 130 is coupled to the display driver 120 , and the display driver 120 is coupled to the electronic paper display panel 110 . The display driver 120 is used to drive the electronic paper display panel 110 to display an image page. Specifically, in this embodiment, the storage device 140 is used for storing the image data DD and various data related to the image data DD, such as the same or similar data such as look-up tables. Next, the data processor 130 is used for accessing the image data DD from the storage device 140 to perform data processing operations on the accessed image data DD to output the image data DD to the display driver 120 . The display driver 120 is used to drive the electronic paper display panel 110 to display a plurality of image frames according to the image data DD, so as to display image pages. In this embodiment, the image frame is a frame of one driving voltage, and the frame to be displayed by the electronic paper display panel 110 each time is an image page, and the image page is formed by a plurality of image frames.

In this embodiment, the data processor 130 includes, for example, a central processing unit (Central Processing Unit, CPU), a microprocessor (Microprocessor), and a digital signal processor (Digital Signal Processor).

Processor, DSP), programmable controller, programmable logic device (Programmable Logic Device, PLD) or other similar devices or combinations of these devices, the present invention is not limited. In this embodiment, the storage device 140 includes, for example, a register circuit, which may be provided inside or outside the data processor 130 . In one embodiment, the storage device 140 includes, for example, a flash drive, a memory card, a mechanical hard drive, a solid state drive (SSD), a cloud server, an SD card, an MMC card, a memory stick, a CF card, or a Embedded storage devices or other similar devices or combinations of these devices are not limited by the present invention.

FIG. 2 is a schematic schematic diagram of combining different image frames according to an embodiment of the present invention. Referring to FIG. 1 and FIG. 2 , in this embodiment, when the display driver 120 wants to drive the electronic paper display panel 110 to display an image frame, usually the data processor 130 first obtains the image data DD of the current frame 220 and the previous frame 210 to It is analyzed whether the display gray scale of the pixels in the current screen 220 and the previous screen 210 has changed. Taking the display of an image picture including two gray scales as an example, a specific pixel may display white in the previous picture 210, and its image data DD is, for example, the corresponding digital code "1". The same pixel may display black in the current picture 220, and its image data DD is, for example, the corresponding digital code "0". The change of the digital code "1" of the image data DD indicates that the display gray scale of this pixel is changed from white to black. Conversely, the pixel may display black in the previous frame 210 and may display white in the current frame 220 . In this embodiment, the display gray scale of the pixels may not be changed. For example, the pixels in the previous frame 210 and the current frame 220 are displayed in black or white. In the present embodiment, the data processor 130 searches for the change of the display gray scales of a plurality of pixels in the current picture 220 and the previous picture 210 by, for example, an address collocation look-up table.

FIG. 3 is a schematic diagram of a first lookup table according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a second lookup table according to an embodiment of the present invention. In FIG. 4 , N is 256, for example. Please refer to FIG. 1 , FIG. 3 and FIG. 4 . In this embodiment, the left column of the first lookup table 300 lists the first gray-scale digital code combinations of four pixels in the previous screen 210 , and the right column lists the current The second grayscale digital code combination of 4 pixels in the picture 220 . The first look-up table 300 includes the correspondence between the first gray-scale digital code combination and the second gray-scale digital code combination.

In this embodiment, the left column of the second lookup table 400 lists a plurality of addresses, and the right column lists the third grayscale digital code combinations of 8 pixels in the previous picture 210 and the current picture 220 . The third gray-scale digital code combination has 8 digital codes, including the first gray-scale digital code combination and the second gray-scale digital code combination. In Figures 3 and 4, the digital code "1" indicates that the pixel is driven by this digital code and displays white in the image screen, and the digital code "0" means that the pixel is driven by this digital code and displays black in the image screen, but the corresponding The relationship is for illustration only, and the invention is not limiting. In addition, in this embodiment, the number of pixels included in the look-up table is not used to limit the present invention.

In this embodiment, the data processor 130 is used to convert the first lookup table 300 into the second lookup table 400 to obtain the correspondence between the plurality of addresses and the third gray-scale digital code combinations of the plurality of pixels. In one embodiment, the first lookup table 300 may be pre-stored in the storage device 140 for the data processor 130 to access, or directly input to the data processor 130 from an external data source. Alternatively, in one embodiment, the data processor 130 can also generate the first look-up table 300 according to the relationship between the pixels and the display gray level, and then store the first look-up table 300 in the storage device 140 . In this embodiment, after the data processor 130 converts the first lookup table 300 into the second lookup table 400, the data processor 130 stores the second lookup table 400 in the storage device 140 for outputting the image data DD for display drive 120 is searched. In this embodiment, the image data DD output by the data processor 130 includes the third grayscale digital code combination. Therefore, in this embodiment, the data processor 130 directly uses the address of the second lookup table 400 to find out the image data DD to be output, which can improve the data processing efficiency. In addition, in this embodiment, the third gray-scale digital code combination includes the first gray-scale digital code combination of 4 pixels and the second gray-scale digital code combination of 4 pixels. Therefore, the data processor 130 according to the second gray-scale digital code combination The address of the lookup table 400 can be used to look up the grayscale changes of 4 pixels in the image frame at a time.

In this embodiment, before the data processor 130 uses the address of the second lookup table 400 to find out the image data DD to be output, the data processor 130 merges the current frame 220 and the previous frame 210 into an integrated frame 200. It should be noted that the order of the operations of converting the lookup table and the operations of merging image frames is not intended to limit the present invention. Referring to FIG. 2 , in this embodiment, the data processor 130 merges the current screen 220 and the previous screen 210 into an integrated screen 200 . The current picture 220 includes a plurality of current pixel rows 222 , and the previous picture 210 includes a plurality of previous pixel rows 212 . In the integrated frame 200, the current frame 220 and the previous frame 210 are merged, and the current pixel row 222 and the previous pixel row 212 are alternately arranged. In this embodiment, the integrated screen 200 includes a plurality of integrated pixel rows 202 . The previous pixel row 212 is arranged in the odd-numbered integrated pixel row among the integrated pixel rows 202 . The pixel row 222 is currently arranged in the even-numbered integrated pixel row among the integrated pixel rows 202 . In other words, in the integrated screen 200 of FIG. 2 , from left to right, the current pixel row 222 is staggered and arranged before the previous pixel row 212 , but the arrangement order is not intended to limit the present invention. In one embodiment, the previous pixel row 212 may also be arranged in an even-numbered integrated pixel row among the integrated pixel rows 202 . The current pixel row 222 may also be arranged in an odd-numbered integrated pixel row among the integrated pixel rows 202 .

Therefore, in this embodiment, the data processor 130 is used to convert the first lookup table 300 into the second lookup table 400 , and combine the current picture 220 and the previous picture 210 into the integrated picture 200 . The data processor 130 generates image data DD according to the integrated frame 200 and the second lookup table 400 , and outputs the image data DD to the display driver 120 . Next, the display driver 120 drives the electronic paper display panel 110 to display a plurality of image frames according to the image data DD, thereby displaying image pages.

FIG. 5 is a schematic schematic diagram of merging different image frames according to another embodiment of the present invention. Referring to FIG. 1 and FIG. 5 , in this embodiment, the electronic paper display panel 110 displays, for example, a first image frame 510 , a second image frame 520 and a third image frame 530 in sequence. When the second image frame 520 is the current frame, the first image frame 510 is the previous frame. Similarly, when the third image frame 530 is the current frame, the second image frame 520 is the previous frame.

Specifically, at the first time sequence, for example, the electronic paper display panel 110 wants to display the second image frame 520, and at this time, the data processor 130 combines the first image frame 510 and the second image frame 520 into the first integrated frame 500A . In the first integrated picture 500A, the previous pixel row 512 is arranged in an odd-numbered integrated pixel row among the integrated pixel row 502A. The pixel row 522 is currently arranged in the even-numbered integrated pixel row among the integrated pixel rows 502A. Next, at the second time sequence, the electronic paper display panel 110, for example, wants to display the third image frame 530. At this time, the data processor 130 combines the second image frame 520 and the third image frame 530 into the second integrated frame 500B. In the second integrated picture 500B, the current pixel row 532 is arranged in the odd-numbered integrated pixel row among the integrated pixel rows 502B. The previous pixel row 522 is arranged in the even-numbered integrated pixel row among the integrated pixel row 502B.

Therefore, compared to the first integrated screen 500A, when the data processor 130 combines the second image frame 520 and the third image frame 530 into the second integrated frame 500B, the pixel row of the second image frame 520 can be maintained in the first image frame 500B. The arrangement position in the integrated frame 500A remains unchanged, and the pixel row of the third image frame 530 is used to replace the arrangement position of the pixel row of the first image frame 510 in the first integrated frame 500A, thereby generating the second integrated frame 500B. Therefore, the method of generating the integrated picture can improve the data processing performance of the data processor 130 when the second image picture 520 and the third image picture 530 are combined into the second integrated picture 500B.

FIG. 6 is a flowchart of steps of a driving method of an electronic paper display device according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 6 , the driving method of this embodiment is at least applicable to the electronic paper display device 100 of FIG. 1 . In step S600 , the electronic paper display device 100 converts the first lookup table 300 into the second lookup table 400 , and merges the current screen 220 and the previous screen 210 into an integrated screen 200 . Next, in step S610 , the electronic paper display device 100 generates image data DD according to the integrated screen 200 and the second lookup table 400 . In step S620, the electronic paper display device 100 drives its electronic paper display panel 110 to display a plurality of image frames according to the image data DD to display image pages. In addition, the driving method of the electronic paper display device of the present embodiment can be sufficiently taught, suggested and implemented from the description of the embodiments in FIGS. 1 to 5 , and thus will not be repeated.

In the exemplary embodiments of FIG. 1 to FIG. 6 , although an image frame including two grayscales is displayed as an example, the present invention is not limited thereto. In one embodiment, each pixel in the image frame can also display three or more grayscales. Taking the display of an image screen including four grayscales as an example, the pixels are driven by digital codes "00", "01", "10" and "11" to display the first grayscale, the second grayscale, and the third grayscale respectively. and the fourth grayscale. In this embodiment, the third gray-scale digital code combination of the second look-up table 400 includes 16 digital codes, and the driving method of the electronic paper display device can be sufficiently taught from the description of the embodiments in FIG. 1 to FIG. 6 , Recommendations and implementation instructions are not repeated here.

To sum up, in the exemplary embodiment of the present invention, the data processor of the electronic paper display device can query the address of the digital code that drives the grayscale changes of multiple pixels at one time from the address of the second lookup table according to the data content of the integrated screen. The combination can improve data processing performance. In addition, the driving method of the exemplary embodiment of the present invention can also be used to drive an electronic paper display device to display an image frame including two or more grayscales.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (10)

1. An electronic paper display device, characterized in that, comprising: Electronic paper display panel for displaying image pages; a display driver, coupled to the electronic paper display panel, for driving the electronic paper display panel to display a plurality of image frames according to image data, so as to display the image pages; and a data processor, coupled to the display driver, for converting the first lookup table into a second lookup table and merging the current picture and the previous picture into an integrated picture, wherein the data processor is based on the integrated picture and the second lookup table to generate the image data and output the image data to the display driver, and the plurality of image frames include the current frame and the previous frame, The first look-up table includes a correspondence between a first gray-scale digital code combination of a plurality of pixels in the previous picture and a second gray-scale digital code combination of the plurality of pixels in the current picture, and the The second lookup table includes a correspondence between a plurality of addresses and a third gray-scale digital code combination of the plurality of pixels in the integrated picture, wherein the third gray-scale digital code combination includes the first gray-scale digital code combined with the second grayscale digital code, The current picture includes a plurality of current pixel lines, the previous picture includes a plurality of previous pixel lines, and in the integrated picture, the plurality of current pixel lines and the plurality of previous pixel lines are arranged alternately. 2. The electronic paper display device according to claim 1, further comprising: A storage device, coupled to the data processor, is used for storing the first lookup table, the second lookup table, the current picture, the previous picture and the integrated picture. 3 . The electronic paper display device according to claim 1 , wherein the data processor searches for a third grayscale digital code combination of the plurality of pixels in the integrated screen according to the plurality of addresses, 3 . to generate the image data, wherein the image data includes the third grayscale digital code combination. 4 . The electronic paper display device according to claim 1 , wherein the integrated picture comprises a plurality of integrated pixel rows, and the plurality of previous pixel rows are arranged in an odd-numbered integrated pixel row among the integrated pixel rows, 5 . and the plurality of current pixel rows are arranged in an even-numbered integrated pixel row among the integrated pixel rows. 5 . The electronic paper display device according to claim 1 , wherein the integrated screen comprises a plurality of integrated pixel rows, and the multiple current pixel rows are arranged in an odd-numbered integrated pixel row among the integrated pixel rows, 6 . and the plurality of previous pixel rows are arranged in an even-numbered integrated pixel row among the integrated pixel rows. 6. A driving method of an electronic paper display device, wherein the electronic paper display device comprises an electronic paper display panel, and the driving method of the electronic paper display device comprises: converting the first lookup table into a second lookup table, and merging the current picture and the previous picture into an integrated picture, The first look-up table includes a correspondence between a first gray-scale digital code combination of a plurality of pixels in the previous picture and a second gray-scale digital code combination of the plurality of pixels in the current picture, and the The second lookup table includes a correspondence between a plurality of addresses and a third gray-scale digital code combination of the plurality of pixels in the integrated picture, wherein the third gray-scale digital code combination includes the first gray-scale digital code combined with the second grayscale digital code, wherein the current frame includes a plurality of current pixel rows, the previous frame includes a plurality of previous pixel rows, and in the integrated frame, the plurality of current pixel rows and the plurality of previous pixel rows are alternately arranged; generating image data according to the integrated picture and the second lookup table; and The electronic paper display panel is driven to display a plurality of image frames according to the image data to display an image page, wherein the plurality of image frames include the current frame and the previous frame. 7 . The driving method of an electronic paper display device according to claim 6 , wherein the electronic paper display device comprises a storage device, and the driving method of the electronic paper display device further comprises: 8 . storing the first lookup table, the second lookup table, the current picture, the previous picture and the integrated picture to the storage device. 8 . The driving method of an electronic paper display device according to claim 6 , wherein in the step of generating the image data according to the integrated screen and the second lookup table, the image data is generated according to the plurality of addresses. 9 . Finding a third gray-scale digital code combination of the plurality of pixels in the integrated picture to generate the image data, wherein the image data includes the third gray-scale digital code combination. 9 . The driving method of an electronic paper display device according to claim 6 , wherein the integrated picture comprises a plurality of integrated pixel rows, and the plurality of previous pixel rows are arranged in an odd-numbered integrated pixel row among the integrated pixel rows. 10 . The pixel row, and the plurality of current pixel rows are arranged in an even-numbered integrated pixel row among the integrated pixel rows. 10 . The driving method of an electronic paper display device according to claim 6 , wherein the integrated screen comprises a plurality of integrated pixel rows, and the plurality of current pixel rows are arranged in an odd-numbered integrated pixel row among the integrated pixel rows. 11 . The pixel row, and the plurality of previous pixel rows are arranged in an even-numbered integrated pixel row among the integrated pixel rows.

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