KR20140096825A - System for driving Electrophoretic Display Device and Method for compensation of fade off according to waiting time Electrophoretic Display Device in the same - Google Patents

System for driving Electrophoretic Display Device and Method for compensation of fade off according to waiting time Electrophoretic Display Device in the same Download PDF

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Publication number
KR20140096825A
KR20140096825A KR1020130009909A KR20130009909A KR20140096825A KR 20140096825 A KR20140096825 A KR 20140096825A KR 1020130009909 A KR1020130009909 A KR 1020130009909A KR 20130009909 A KR20130009909 A KR 20130009909A KR 20140096825 A KR20140096825 A KR 20140096825A
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South Korea
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gray
waveform
time
display device
electrophoretic display
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KR1020130009909A
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Korean (ko)
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KR102042526B1 (en
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배형국
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엘지디스플레이 주식회사
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1685—Operation of cells; Circuit arrangements affecting the entire cell
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

The present invention relates to an electrophoretic display device drive system and an electrophoretic display device drive system for compensating for a phenomenon in which color fade-off occurs over time due to positional change of a particle representing a color after updating in an electrophoretic display device, and a fade- The method of claim 1, further comprising: storing a previous image and a next image, respectively; Storing gray-to-gray waveform information and time-compensation waveform information; Checking a waiting time; Comparing the stored previous image with the next image; Loading the stored gray-to-gray waveform and time-compensated waveform information; And combining the waveform corresponding to the comparison result of the previous image and the next image with the time-compensating waveform corresponding to the waiting time, and driving the electrophoretic display device with frame information corresponding to the merged waveform form .

Description

[0001] The present invention relates to an electrophoretic display device driving system and an electrophoretic display device, and more particularly, to an electrophoretic display device and a method of compensating fade-

The present invention relates to an electrophoretic display device, and more particularly, to an electrophoretic display device driving system and an electrophoretic display device which compensate for a phenomenon in which an electrophoretic display device exhibits fade- And a fade-off compensating method according to the waiting time of the display device.

An electrophoretic display device (EPD) is an apparatus that displays an image using an electrophoresis phenomenon in which colored charged particles move by an electric field applied from the outside. Such an electrophoretic display device has a bi-stable property, so that even if the applied voltage is removed, the original image can be preserved for a long time. That is, the electrophoretic display device is particularly suitable for an electronic book field in which fast switching of images is not required, because a constant image can be maintained for a long time without continuously applying a voltage. In addition, the electrophoretic display device has an advantage that it is not dependent on a viewing angle, unlike a liquid crystal display device, and can provide a comfortable image to the eye in a degree similar to paper.

FIG. 1 is a schematic cross-sectional view showing a general electrophoretic display device displaying a black image, and FIG. 2 is a schematic cross-sectional view showing a case where a conventional electrophoretic display device displays a white image.

1, an electrophoretic display 100 includes a first substrate 110 and a second substrate 120 facing each other, and a first substrate 110 and a second substrate 120 disposed between the first substrate 110 and the second substrate 120, And an electrophoretic film (130) disposed on the substrate.

On the first substrate 110, a plurality of gate lines, a plurality of data lines, and a plurality of pixels defined by crossing the gate lines and the data lines are formed. A thin film transistor (TFT) 111 and a pixel electrode 112 are formed in the pixel. The thin film transistor 111 is switched according to a scan signal applied through a gate line. As the thin film transistor 111 is switched, a data voltage supplied to the data line is supplied to the pixel electrode 112.

A common electrode 121 facing the pixel electrode 112 is formed on the second substrate 120. The electrophoretic film 130 is driven according to a difference between a voltage applied to the common electrode 121 and a voltage applied to the pixel electrode 112 to display an image.

The electrophoretic film 130 includes a plurality of microcapsules 131. The microcapsule 131 includes a dielectric solvent 1311, positive electrified first charged particles 1312 dispersed in the dielectric solvent 1311, and a negative electrode 1312 dispersed in the dielectric solvent 1311. [ And second charged particles 1313 charged with negative (-). The first charged particles 1312 and the second charged particles 1313 may be formed to have different colors. For example, if the first charged particles 1312 have a black color, the second charged particles 1313 may have a white color. The first charged particles 1312 and the second charged particles 1313 are formed by the Coulomb force generated according to the difference between the voltage applied to the common electrode 121 and the voltage applied to the pixel electrode 112, By moving in the dielectric solvent 1311, an image can be displayed.

1, when a voltage of 0 V is applied to the common electrode 121 and a voltage of +15 V is applied to the pixel electrode 112, the electrophoretic film 130 is formed as follows . Firstly, the positively charged first charged particles 1312 move toward the common electrode 121, thereby being located on the second substrate 120 side. Next, the negatively charged second charged particles 1313 move toward the pixel electrode 112, thereby being positioned on the first substrate 110 side. The electrophoretic display device 100 displays a black image because the second substrate 120 is a portion where an image is displayed.

2, when a voltage of 0V is applied to the common electrode 121 and a voltage of -15V is applied to the pixel electrode 112, the electrophoretic film 130 is driven as follows . The positively charged first charged particles 1312 move toward the pixel electrode 112, thereby being located on the first substrate 110 side. Next, the negatively charged second charged particles 1313 move toward the common electrode 121, thereby being located on the second substrate 120 side. Accordingly, the electrophoretic display device 100 displays a white image.

As described above, the electrophoretic display device 100 displays the image by adjusting the voltage supplied to the pixel electrode 112 to move the first charged particles 1312 and the second charged particles 1313 . The electrophoretic display device 100 has a first application time for applying a positive voltage to the pixel electrode 112 and a second application time for applying a negative voltage to the pixel electrode 112, So that an image composed of various colors existing between black and white can be displayed. To this end, the electrophoretic display device 100 prepares waveforms of all cases for the previous gray and the next gray, stores information in a lookup table, analyzes the images in the timing controller, And transmits the waveform to the display device.

3A to 3D show an example of a Gray to Gray Waveform for driving the electrophoretic display device.

3A to 3D show gray-to-gray waveforms in which the electrophoretic display device 100 can display colors corresponding to a total of sixteen grayscales. The grayscales indicated on the left side in the Y axis direction are related to the previous image and the grayscales indicated on the right side in the Y axis direction are related to the next image.

FIG. 3A shows a gray-to-gray waveform used to switch from the previous image corresponding to the entire 16 gradation ranges to the next image corresponding to the 16th gradation (white gradation), and FIG. 3B shows a gray- Gray level waveform used for switching from the previous image to the next image corresponding to the first gradation (black gradation), and FIG. 3C shows the gray-to-gray waveform used for switching from the previous image corresponding to the entire 16 gradation ranges to the seventh gradation And FIG. 3D shows gray-to-gray waveforms used for switching from the previous image corresponding to the entire 16 gray-scale ranges to the next image corresponding to the 15th gray-scale, Wave form.

The first gradation is a black gradation. The black gradation is set to the 0th gradation and the white gradation is set to the 15th gradation in the case of all the 16 gradation ranges, but in this specification, the black gradation is set to the first gradation and the white gradation to the 16th gradation Explain. 3A to 3D, the X axis direction indicates a switching time T for switching from the previous image to the next image. 3A to 3D denote the case where a positive voltage is applied to the pixel electrode 112 and the drive waveform of the white space denotes a negative voltage Is applied.

Thus, in order to express 16 gray, a total of 256 gray-gray waveform information should be stored in the look-up table in 16 gray-scale ranges of the previous image and 16 gray-scale ranges of the next image.

4 is a configuration diagram of a system for driving a conventional electrophoretic display device.

As shown in Fig. 4, a system for driving a conventional electrophoretic display includes a first frame memory 1 for storing a previous image, a second frame memory 2 for storing a next image, A gray memory 3 for storing a total of 256 gray-to-gray waveform information, such as a gray-scale gray-scale information, and a previous frame stored in the first frame memory 1 and a next image stored in the second frame memory 2 And a timing controller (not shown) for driving the electrophoretic display device by forming gray-to-gray waveform stored in the fresh memory 3 and forming frame information corresponding to the waveform according to the comparison result of the previous image and the next image 4).

The operation of the system for driving the electrophoretic display device according to the related art will now be described.

The previous image is stored in the first frame memory 1, the next image is stored in the second frame memory 2, and a total of 256 gray-to-gray waveform information as described above is stored in the fresh memory 3 do.

The timing controller 4 reads and compares the previous image stored in the first frame memory 1 and the next image stored in the second frame memory 2. Also, the gray-to-gray waveform stored in the fresh memory 3 is loaded, and frame information corresponding to the corresponding waveform is formed according to the comparison result between the previous image and the next image to drive the electrophoretic display device.

However, such conventional electrophoretic display devices have the following problems.

FIG. 5 is an explanatory diagram for explaining a fade-off occurring in a conventional electrophoretic display device. FIG. 6 illustrates a ghosting phenomenon according to a waiting time when a previous image is a mosaic image and a next image is a black image. Fig.

As described above, the electrophoretic display device is produced by forming the first charged particles (black) charged with the positive (+) and the second charged particles (white) charged with the negative (-) in the form of a capsule or a cup, (C) generated by the difference between the voltage applied to the pixel electrode (121) and the voltage applied to the pixel electrode (112).

However, as shown in FIG. 5, the particle position information at the time of updating and the particle position information at the time of waiting are changed due to influence of attraction force, repulsive force and gravity of particles after updating, and fade-off phenomenon Occurs.

Therefore, as shown in FIG. 6, there is no serious problem in about 2 seconds in the mosaic image. However, if waiting for about 300 seconds, the black and white areas are faded off in different directions and the next black image is updated. The ghosting phenomenon of the mosaic type occurs because the reflectance of the image does not reach the desired target.

In order to solve the problem of the conventional electrophoretic display device, the present invention uses a timer for checking a time to enter a sleep mode to check how much time has elapsed since the update, A method of compensating a fade-off phenomenon by merging a time-compensation waveform corresponding to a waiting time before transmitting a gray-gray waveform form by producing a look-up table and compensating for a fade-off phenomenon, and a fade-off compensation method of the electrophoretic display device The purpose is to provide.

According to an aspect of the present invention, there is provided an electrophoretic display device driving system including a first frame memory for storing previous images; A second frame memory for storing a next image; A first refresh memory for storing a plurality of gray-to-gray waveform information; A second fresh memory for storing time-compensated waveform information according to a waiting time; A gray-to-gray waveform stored in the first refresh memory, and a gray-to-gray waveform stored in the first refresh memory, Compensating wave form information stored in the second refresh memory, and merging a waveform corresponding to the comparison result between the previous image and the next image and a time-compensating waveform corresponding to the waiting time, And a timing controller which forms information and drives the electrophoretic display device.

According to another aspect of the present invention, there is provided a method of compensating for fade-off in an electrophoretic display device, comprising: storing a previous image and a next image; Storing gray-to-gray waveform information and time-compensation waveform information; Checking a waiting time; Comparing the stored previous image with the next image; Loading the stored gray-to-gray waveform and time-compensated waveform information; And combining the waveform corresponding to the result of the comparison between the previous image and the next image and the time-compensated waveform corresponding to the waiting time to drive the electrophoretic display device as frame information suitable for the merged waveform form There are features.

The fade-off compensation method according to the waiting time of the electrophoretic display device driving system and the electrophoretic display device according to the present invention having the above-described characteristics has the following effects.

That is, it checks how much time has elapsed since the update, compiles the time-compensated look-up table according to time, and compensates for the fade-off phenomenon by merging the time compensation waveforms corresponding to the waiting time before transmitting the waveform.

1 is a schematic cross-sectional view showing a case where a general electrophoretic display device displays a black image
2 is a schematic cross-sectional view showing a case where a general electrophoretic display device displays a white image
3A to 3D show an example of a gray-to-gray waveform for driving an electrophoretic display device
4 is a configuration diagram of a system for driving a conventional electrophoretic display device
FIG. 5 is an explanatory diagram for explaining a fade-off occurring in a conventional electrophoretic display device;
FIG. 6 is an explanatory view explaining a ghosting phenomenon according to waiting time when the previous image is a mosaic image and the next image is a black image.
7 is a configuration diagram of a system for driving the electrophoretic display device according to the present invention
8A to 8D are explanatory diagrams for explaining an example of a time-compensating waveform according to the waiting time of the present invention
FIG. 9 is a waveform diagram showing a combination of an existing waveform according to the present invention and a time-

The electrophoretic display device and the fade-off compensation method according to the present invention having the above-described features will now be described in more detail with reference to the accompanying drawings.

7 is a configuration diagram of a system for driving an electrophoretic display device according to the present invention.

As shown in FIG. 7, the system for driving the electrophoretic display according to the present invention includes a first frame memory 11 for storing a previous image, a second frame memory 12 for storing a next image, A first refresh memory 13 for storing 256 gray-to-gray waveform information in total, a second refresh memory 15 for storing time-compensated waveform information according to a waiting time, A timer is used to check the waiting time and the previous image stored in the first frame memory 11 and the next image stored in the second frame memory 12 are read and compared and are stored in the first fresh memory 13 The stored gray-to-gray waveform and the time-compensated waveform information stored in the second fresh memory 15 are loaded, and the corresponding gray- Forming the frame information for the form and merge with the merge time compensation waveform according to the waiting time waveform and is configured by a timing controller 14 for driving the electrophoretic display device.

8A to 8D are examples of time-compensated waveforms according to the present invention.

FIG. 8A is a configuration diagram of a time-compensating waveform when the waiting time is 30 seconds, FIG. 8B is a configuration diagram of a time-compensating waveform when the waiting time is 1 minute, FIG. 8C is a time- FIG. 8D is a configuration diagram of a time-compensating waveform when the waiting time is 5 minutes

Such time-compensated firmware is stored in the second fresh memory 15.

The fade-off compensation method in the electrophoretic display according to the present invention will now be described.

FIG. 9 is a waveform diagram showing a combination of an existing waveform according to the present invention and a time-compensation waveform according to waiting time.

The previous image is stored in the first frame memory 11, the next image is stored in the second frame memory 12, and a total of 256 gray-to-gray waveform information as described above is stored in the first refresh memory 13, And stores the time-compensated waveforms as shown in Figs. 8A to 8D in the second fresh memory 15.

The timing controller 14 checks the waiting time using the internal timer and reads and compares the previous image stored in the first frame memory 11 and the next image stored in the second frame memory 12 , Gray-to-gray waveform stored in the first fresh memory 13 and time-compensated waveform information stored in the second fresh memory 15 are loaded, and a waveform corresponding to the comparison result between the previous image and the next image And the time-compensating waveform according to the waiting time are combined as shown in FIG. 9 to form frame information corresponding to the merged waveform, thereby driving the electrophoretic display device.

The technical idea of the present invention has been specifically described according to the above preferred embodiments, but the above-mentioned embodiments are intended to be illustrative and not restrictive. In addition, it will be understood by those of ordinary skill in the art that various embodiments are possible within the scope of the technical idea of the present invention. Accordingly, the scope of the present invention should be determined by the claims rather than the examples described.

11, 12: Frame memory 13, 15: Fresh memory
14: Timing controller

Claims (3)

A first frame memory for storing previous images;
A second frame memory for storing a next image;
A first refresh memory for storing a plurality of gray-to-gray waveform information;
A second fresh memory for storing time-compensated waveform information according to a waiting time; And
A gray-to-gray waveform stored in the first refresh memory and a gray-to-gray waveform stored in the first refresh memory, Compensated waveform information stored in the second refresh memory, and merging the waveform corresponding to the comparison result between the previous image and the next image and the time-compensated waveform corresponding to the waiting time, And a timing controller for driving the electrophoretic display device by driving the electrophoretic display device. Storing a previous image and a next image, respectively;
Storing gray-to-gray waveform information and time-compensation waveform information;
Checking a waiting time;
Comparing the stored previous image with the next image;
Loading the stored gray-to-gray waveform and time-compensated waveform information; And
And combining the waveform corresponding to the comparison result between the previous image and the next image and the time-compensated waveform according to the waiting time to drive the electrophoretic display device as frame information corresponding to the merged waveform form Of the electrophoretic display device. 3. The method of claim 2,
Time-compensated waveforms include time-compensated waveforms with a 30-second wait time, time-compensated waveforms with a 1-minute wait time, time-compensated waveforms with a 3-minute latency, and time-compensated waveforms with a five- And compensating for the fade-off of the electrophoretic display device.
KR1020130009909A 2013-01-29 2013-01-29 System for driving Electrophoretic Display Device and Method for compensation of fade off according to waiting time Electrophoretic Display Device in the same KR102042526B1 (en)

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CN115359761A (en) * 2022-08-16 2022-11-18 广州文石信息科技有限公司 Ink screen display control method and device based on key frame
CN115359763A (en) * 2022-08-16 2022-11-18 广州文石信息科技有限公司 Ink screen display control method, device, equipment and storage medium

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CN115359761A (en) * 2022-08-16 2022-11-18 广州文石信息科技有限公司 Ink screen display control method and device based on key frame
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CN115359761B (en) * 2022-08-16 2023-07-18 广州文石信息科技有限公司 Ink screen display control method and device based on key frames

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