KR20110071308A - Electrophoretic display apparatus and method for driving the same - Google Patents

Electrophoretic display apparatus and method for driving the same Download PDF

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KR20110071308A
KR20110071308A KR1020090127836A KR20090127836A KR20110071308A KR 20110071308 A KR20110071308 A KR 20110071308A KR 1020090127836 A KR1020090127836 A KR 1020090127836A KR 20090127836 A KR20090127836 A KR 20090127836A KR 20110071308 A KR20110071308 A KR 20110071308A
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South Korea
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electrode
voltage
data voltage
data
common
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KR1020090127836A
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Korean (ko)
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이종권
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엘지디스플레이 주식회사
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Priority to KR1020090127836A priority Critical patent/KR20110071308A/en
Publication of KR20110071308A publication Critical patent/KR20110071308A/en

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    • 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
    • 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

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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)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

Disclosed are an electrophoretic display device having an excellent pixel voltage holding characteristic and in which a second electrode (storage electrode) of a storage capacitor and a second electrode (common electrode) of an electrophoretic capacitor can be driven independently of each other, and a driving method thereof. An electrophoretic display of the present invention includes a data line for supplying a data voltage; A common electrode to which a common voltage is applied; Storage electrodes; A pixel electrode positioned between the common electrode and the storage electrode and receiving the data voltage from the data line to generate an electric field for display with the common electrode; And a data voltage converter configured to receive the data voltage from the data line, convert the data voltage, and supply the converted data voltage to the storage electrode.

Electrophoresis, storage electrodes

Description

Electrophoretic Display Apparatus and Method for Driving The Same}

The present invention relates to an electrophoretic display device and a driving method thereof.

The electrophoretic display is one of flat panel displays used in the manufacture of e-books. In the case of an electrophoretic display, an electrophoretic dispersion is positioned between two opposing electrodes. The colored charge particles contained in the electrophoretic dispersion are moved to the electrodes of opposite polarity by electrophoresis by the voltage applied to the two electrodes, thereby displaying an image.

1 is a circuit diagram schematically illustrating a unit cell of a general electrophoretic display device.

As shown in FIG. 1, a conventional electrophoretic display device is turned on in response to a scan pulse supplied from a gate line GL to store a data voltage supplied from the data line DL and a storage capacitor Cst and It includes a thin film transistor (T) to each of the first electrodes of the electrophoretic capacitor (Cap). The common voltage Vcom is equally supplied to the second electrodes of the storage capacitor Cst and the electrophoretic capacitor Cap.

When the thin film transistor T is turned on, an electric field is generated between the first and second electrodes of the electrophoretic capacitor Cap, so that the colored charged particles move to the electrode having the opposite polarity. However, when the thin film transistor T is turned off, a kickback voltage (ΔVp), which is a voltage drop due to parasitic capacitance, and a current leakage to the thin film transistor are generated, so that the first and second capacitors of the electrophoretic capacitor Cap are generated. The electric field generated between the second electrodes cannot be maintained as it is.

The storage capacitor Cst is to minimize the degradation of the pixel voltage holding characteristic due to the kickback voltage and the leakage current. That is, even when the thin film transistor T is turned off, the electric field between the first and second electrodes of the electrophoretic capacitor Cap may be kept constant by the storage capacitor Cst.

However, since the driving voltage used in the electrophoretic display device is + 15V or -15V and its voltage level is high, the kickback voltage generated during the turn-off of the thin film transistor T has a storage capacitor Cst having the above structure. Too large for it.

Furthermore, in order to implement a high resolution electrophoretic display device, the electrodes of the storage capacitor Cst must be reduced in size, which causes the capacitance of the storage capacitor Cst to decrease, thereby further lowering the pixel voltage holding characteristic.

In addition, when the second electrodes of the storage capacitor Cst and the electrophoretic capacitor Cap are connected to each other to receive the same common voltage Vcom, a problem that occurs at the second electrode of the storage capacitor Cst ( For example, a short circuit with another electrode or line) also affects the second electrode of the electrophoretic capacitor Cst, resulting in a driving failure of the electrophoretic display device.

An aspect of the present invention provides an electrophoretic display device having excellent pixel voltage holding characteristics, and wherein a second electrode (storage electrode) of a storage capacitor and a second electrode (common electrode) of an electrophoretic capacitor can be driven independently of each other. To provide.

In another aspect of the present invention, an electrophoretic display device is configured to independently drive a second electrode (storage electrode) of a storage capacitor and a second electrode (common electrode) of an electrophoretic capacitor so that the electrophoretic display device exhibits excellent pixel voltage holding characteristics. It is to provide a method of driving a phorescent display device.

In addition to the above mentioned aspects of the present invention, other features and advantages of the present invention will be described below, or from such description and description, will be clearly understood by those skilled in the art.

In addition, other features and advantages of the present invention may be newly understood through practice of the present invention.

According to an aspect of the present invention as described above, a data line for supplying a data voltage; A common electrode to which a common voltage is applied; Storage electrodes; A pixel electrode positioned between the common electrode and the storage electrode and receiving the data voltage from the data line to generate an electric field for display with the common electrode; And a data voltage converter configured to receive the data voltage from the data line, convert the data voltage, and supply the converted data voltage to the storage electrode.

According to another aspect of the present invention, a method of driving an electrophoretic display device including a common electrode, a storage electrode, and a pixel electrode between the common electrode and the storage electrode, the method comprising: supplying a common voltage to the common electrode; Supplying a data voltage through the data line; Transferring the data voltage supplied through the data line to the pixel electrode; Converting the data voltage supplied from the data line; A method of driving an electrophoretic display device is provided comprising supplying the converted data voltage to the storage electrode.

General description of the present invention as described above is only for illustrating or illustrating the present invention, it does not limit the scope of the present invention.

The present invention maximizes the voltage difference between the electrodes of the storage capacitor so that the electrophoretic display device has an excellent pixel voltage holding characteristic, so that the electrode size of the storage capacitor is essential for implementing a high resolution electrophoretic display device. And excellent picture quality can be guaranteed.

Further, according to the present invention, since the second electrode (storage electrode) of the storage capacitor and the second electrode (common electrode) of the electrophoretic capacitor are driven independently of each other, that is, since they are not electrically connected to each other, the storage capacitor It is possible to prevent the driving failure caused by the problem occurring in the second electrode (storage electrode).

Hereinafter, embodiments of an electrophoretic display device and a driving method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

The technical idea of the present invention may be applied to all electrophoretic display devices regardless of color implementation. Hereinafter, the present invention will be described by taking a mono type electrophoretic display device that implements only black and white for convenience of description. . That is, the technical idea of the present invention disclosed below, as well as an electrophoretic display device further including a color filter, of the electrophoretic display device in which the charged particles in the electrophoretic dispersion are colored red, blue, green or white. The same may be applied to the case.

In addition, the technical idea of the present invention is a microcapsule method in which the electrophoretic medium is present inside the capsule, as well as a microcup method in which the electrophoretic medium is present in a cavity defined by the partition wall. The same may be applied to all of the electrophoretic display devices, but for the convenience of description, the present invention will be described with reference to the microcapsule type electrophoretic display device as an example.

The term "data voltage" used in describing the present invention means the voltage supplied to the data line.

The term "pixel voltage" as used herein refers to a voltage applied to the pixel electrode of a particular cell.

As used herein, the term "storage voltage" refers to the voltage applied to the storage electrode of a particular cell.

2 and 3 show an electrophoretic display device and a cell according to an embodiment of the present invention, respectively.

As shown in FIG. 2, an electrophoretic display device according to an exemplary embodiment of the present invention includes m × n cells formed by crossing data lines D1 to Dm and gate lines G1 to Gn with each other ( The electrophoretic display panel 100 arranged in a matrix type, the data driver 20 for supplying data voltages to the data lines D1 to Dm, and the scan pulses for supplying scan pulses to the gate lines G1 to Gn. A gate driver 30, a common voltage generator 40, and a controller 10 controlling the data / gator drivers 20 and 30 and the common voltage generator 40.

Each cell 101 has thin film transistors T in an intersection region of the data lines D1 to Dm and the gate lines G1 to Gn. The thin film transistors T gate electrodes are connected to the gate lines G1 to Gn, the source electrodes of the thin film transistors T are connected to the data lines D1 to Dm, and the drain electrodes of the thin film transistors T correspond to each other. Connected to the pixel electrode 110. The thin film transistor T is turned on in response to a scan pulse from the gate lines G1 to Gn to transfer the data voltage from the data lines D1 to Dm to the pixel electrode 110.

The electrophoretic display panel 100 has a transparent common electrode 120 on the pixel electrode 110 for simultaneously supplying a common voltage Vcom to all the cells 101. The pixel electrode 110 and the common electrode 120 constitute an electrophoretic capacitor Cap.

As shown in FIG. 3, the electrophoretic display panel 100 includes a plurality of microcapsules 130 interposed between the pixel electrode 110 and the common electrode 120. Microcapsules 130 have electrophoretic dispersions therein. The electrophoretic dispersion includes a dielectric solvent and positively and negatively charged particles 131 and 132 respectively dispersed in the dielectric solvent.

FIG. 3 illustrates an electrophoretic dispersion in which positively charged black particles 131 and negatively charged white particles 132 are dispersed in a colorless dielectric solvent, but the electrophoretic dispersion of the present invention is limited thereto. Electrophoretic dispersions in which positively charged white particles and negatively charged black particles are dispersed in a colorless dielectric solvent, electrophoretic dispersions in which charged white particles are dispersed in a dielectric solvent comprising black dye, and charging An electrophoretic dispersion in which the black particles are dispersed in a dielectric solvent including a white dye may be used.

When the data voltage and the common voltage are applied to the pixel electrode 110 and the common electrode 120, respectively, and an electric field is generated therebetween, the colored charged particles 131 and 132 in the electrophoretic dispersion are electrophoresis by electrophoresis. Black or white is displayed in the cell 101 by moving to the electrodes of opposite polarity, respectively.

Each cell 101 of the electrophoretic display panel 100 has a storage electrode 150 under the pixel electrode 110. That is, the pixel electrode 110 of each cell 101 is positioned between the common electrode 120 and the storage electrode 150. The pixel electrode 110 and the storage electrode 150 constitute a storage capacitor Cst.

Each cell 101 of the electrophoretic display panel 100 has a data voltage converter 140. The data voltage converter 140 receives a data voltage from the data lines D1 to Dm, converts the data voltage, and supplies the converted data voltage to the storage electrode 150.

According to an embodiment of the present invention, the data voltage converter 140 is an inverter for inverting the phase of the data voltage received from the data lines D1 to Dm.

According to the exemplary embodiment of the present invention, when the data voltage supplied through the data lines D1 to Dm is + 15V, the pixel voltage applied to the pixel electrode 110 is + 15V but is applied to the storage electrode 150. The storage voltage is -15V. That is, the difference between the pixel voltage and the storage voltage is 30V. Therefore, the charge amount Q accumulated in the storage capacitor Cst calculated by Equation 1 below is 30V · C.

Equation 1: Q = C

(Where Q is the amount of charge accumulated in the storage capacitor Cst, C is the capacitance of the storage capacitor Cst, and ΔV is the difference between the pixel voltage and the storage voltage)

In the above case, the data voltage supplied through the data lines D1 to Dm is + 15V, but the common voltage (Vcom = 0V) is always applied to the storage electrode 150 as in the conventional electrophoretic display device. If it is assumed, the difference between the pixel voltage and the storage voltage is 15V, and the charge Q accumulated in the storage capacitor Cst is only 15V · C.

As can be seen from the above, according to the present invention, the amount of charge Q accumulated in the storage capacitor Cst is twice that of the conventional electrophoretic display device, and the pixel voltage retention characteristics of the electrophoretic display device are thus increased. great. Accordingly, by applying the technical idea of the present invention to a high resolution electrophoretic display device which requires reduction of the size of the storage electrode 150 and the pixel electrode 110, that is, the reduction of the capacitance C of the storage capacitor Cst. The fall of the pixel voltage retention characteristic can be prevented as much as possible. That is, the decrease in capacitance C may be offset by the increase in voltage difference ΔV.

In addition, according to the present invention, since the storage electrode 150 and the common electrode 120 are driven independently of each other, that is, they are not electrically connected to each other, the common electrode 120 is generated in the storage electrode 150. It may not be affected by problems such as a short circuit. That is, when the storage electrode 150 and the common electrode 120 are commonly connected to the common voltage generator 40, the storage electrode 150 and other electrode wirings (for example, the gate line GL) that may occur in a process may occur. ) Or the data line DL] may be prevented from distorting the common voltage Vcom, and thus, the characteristics of the common voltage Vcom applied to the common electrode 120 may be maintained.

The data driver 20 of the present invention includes a plurality of data driver ICs each including a shift register, a latch, a multiplexer (MUX), an output buffer, and the like. The data driver 20 latches digital image data under the control of the controller 10 and generates a data voltage to be supplied to the data lines D1 to Dm using the digital image data.

The gate driver 30 of the present invention includes a shift register, a level shifter for converting a swing width of an output signal of the shift register into a swing width suitable for driving the thin film transistor T, and level shifters and gate lines G1 to Gn. A plurality of gate driver ICs each including an output buffer between the < RTI ID = 0.0 > The gate driver 30 sequentially outputs scan pulses synchronized with the data voltages supplied to the data lines D1 through Dm.

The common voltage generator 40 of the present invention generates a common voltage Vcom and supplies it to the common electrode 120.

The controller 10 of the present invention receives a vertical / horizontal synchronization signal (Vsync, Hsync) and a clock signal (CLK) from the outside to control the control signal for controlling the operation timing of the data driver 20 and the gate driver 30 Generate. In more detail, the controller 10 generates a data driving control signal DDC and a gate driving control signal GDC using the vertical / horizontal synchronization signals Vsync and Hsync and the clock signal CLK. 20 and the gate driver 30, respectively. The data driving control signal DDC includes a source shift clock SSC, a source start pulse SSP, and a source output enable signal SOE. The gate driving control signal GDC includes a gate start pulse GSP, a gate shift clock GSC, and a gate output enable signal GOE.

The control unit 10 of the present invention determines the waveform of the driving voltage for the grayscale change between images based on the image data provided from the outside, and based on the driving voltage waveform of each cell 101 thus determined the data driver 20 Generates digital image data to be supplied to.

4 is a circuit diagram schematically illustrating a unit cell 101 of an electrophoretic display device according to a first embodiment of the present invention.

According to the first embodiment of the present invention, the data voltage converter 140 includes a PMOS transistor 142, an NMOS transistor 141, a first node N1, and a second node N2.

The PMOS transistor 142 includes a first gate electrode, a first source electrode, and a first drain electrode. The NMOS transistor 141 includes a second gate electrode, a second source electrode, and a second drain electrode.

The first node N1 is connected to the first and second gate electrodes and the data line DL, respectively, and the second node N2 is connected to the first and second drain electrodes and the storage electrode 150. Respectively).

The first source electrode of the PMOS transistor 142 is connected to a first common power supply terminal to receive a first voltage Vdd, and the second source electrode of the NMOS transistor 141 is connected to a second common power supply terminal. The second voltage Vss is supplied. The first voltage Vdd is higher than the common voltage Vcom supplied to the common electrode 120, and the second voltage Vss is lower than the common voltage Vcom. According to the first embodiment of the present invention, the first voltage Vdd is + 15V, the common voltage Vcom is 0V, and the second voltage Vss is -15V.

When a data voltage of + 15V is supplied through the data line DL and a scan pulse is supplied through the gate line GL, the thin film transistor T is turned on in response to the scan pulse, thereby increasing the data voltage of + 15V. The pixel electrode 110 is transferred to the pixel electrode 110. That is, the pixel voltage is + 15V.

Meanwhile, the first node N1 also receives a data voltage of + 15V from the data line DL and transfers it to the first and second gate electrodes, respectively. Since the data voltage of + 15V only turns on the NMOS transistor 141, only the second voltage Vss of −15V is applied to the storage electrode 150 via the second node N2. That is, the storage voltage is -15V.

When the data voltage of -15V is supplied through the data line DL and the scan pulse is supplied through the gate line GL, only the thin film transistor T and the PMOS transistor 142 are turned on, so the pixel voltage is It is -15V and the storage voltage is + 15V.

FIG. 5 is a circuit diagram schematically illustrating a unit cell 101 of an electrophoretic display device according to a second exemplary embodiment of the present invention.

As shown in FIG. 5, the electrophoretic display device according to the second exemplary embodiment of the present invention is the same as the first exemplary embodiment of the present invention except that the selection transistor 160 is further included. The select transistor 160 may generate data only when the pixel electrode 110 of each cell 101 receives a data voltage from the data line DL, that is, only when a pixel voltage is applied to the pixel electrode 110. The data voltage supplied from the line DL is transferred to the data voltage converter 140.

The gate electrode of the select transistor 160 is connected to the gate line GL to which the gate electrode of the thin film transistor T of the corresponding cell 101 is connected. The source electrode of the select transistor 160 is connected to the data line GL to which the source electrode of the thin film transistor T of the corresponding cell 101 is connected. The drain electrode of the select transistor 160 is connected to the first node N1 of the corresponding cell 101.

Therefore, when the thin film transistor T of the corresponding cell 101 is turned on in response to a scan pulse supplied from the gate line GL, the selection transistor 160 is also turned on at the same time. As a result, only when the data voltage is transferred to the pixel electrode 110 of the corresponding cell 101 through the thin film transistor T, the data voltage supplied from the data line DL is applied to the selection transistor 160. It is transmitted to the first node (N1) through.

For example, when a data voltage of + 15V is supplied through the data line DL and a scan pulse is supplied through the gate line GL, the thin film transistor T is turned on in response to the scan pulse to thereby + 15V. The data voltage of is transferred to the pixel electrode 110. At the same time, since the selection transistor 160 is turned on in response to a scan pulse supplied through the gate line GL, a data voltage of + 15V is applied through the first node N1 to the first and second gate electrodes. Is passed to each. Since the data voltage of + 15V only turns on the NMOS transistor 141, only the second voltage Vss of −15V is applied to the storage electrode 150 via the second node N2. As a result, the pixel voltage is + 15V and the storage voltage is -15V.

When a data voltage of -15V is supplied through the data line DL and a scan pulse is supplied through the gate line GL, the thin film transistor T, the selection transistor 160, and the PMOS transistor 142 are turned on, respectively. Since it is on, the pixel voltage is -15V and the storage voltage is + 15V.

Since the thin film transistor T, the selection transistor 160, the NMOS transistor 141, and the PMOS transistor 142 are all turned off while the scan pulse is not supplied from the gate line GL, the pixel electrode. The voltage difference between the 110 and the storage electrode 150 may be kept constant.

Therefore, according to the second embodiment of the present invention as described above, the storage electrode 150 has a polarity opposite to that of the pixel voltage only when the pixel voltage is applied to the pixel electrode 110 of the unit cell 101. Since a storage voltage is applied, a large voltage difference between the pixel electrode 110 and the storage electrode 150 can be kept constant.

6 is a diagram illustrating waveforms of a pixel voltage Vp and a storage voltage Vst of a unit cell 101 of an electrophoretic display according to an exemplary embodiment of the present invention.

As illustrated in FIG. 6, according to an exemplary embodiment, the pixel voltage Vp applied to the pixel electrode 110 of the unit cell 101 and the storage electrode 150 of the cell 101 are applied. Since the storage voltages Vst have opposite phases or polarities, the amount of charge accumulated in the storage capacitor Cst may be increased, thereby improving the pixel voltage Vp holding characteristics of the electrophoretic display.

It is to be understood that the embodiments of the present invention described above are merely intended to illustrate or describe the present invention, and to provide a more detailed description of the invention of the claims. It will be apparent to those skilled in the art that various changes and modifications of the embodiments can be made without departing from the spirit and scope of the invention. Accordingly, the invention includes all changes and modifications within the scope of the invention as set forth in the claims and their equivalents.

The accompanying drawings are included to assist in understanding the present invention and to form a part of the specification, to illustrate embodiments of the present invention, and to explain the principles of the present invention together with the detailed description of the invention.

1 is a circuit diagram schematically illustrating a unit cell of a general electrophoretic display device,

2 and 3 are views for schematically illustrating an electrophoretic display device and a unit cell according to an embodiment of the present invention, respectively.

4 is a circuit diagram schematically illustrating a unit cell of an electrophoretic display device according to a first exemplary embodiment of the present invention.

FIG. 5 is a circuit diagram schematically illustrating a unit cell of an electrophoretic display device according to a second exemplary embodiment of the present invention.

6 is a diagram illustrating waveforms of a pixel voltage Vp and a storage voltage Vst of a unit cell of an electrophoretic display according to an exemplary embodiment of the present invention.

<Short description of drawing symbols>

10: control unit 20: data driver

30: gate driver 40: common voltage generator

100: electrophoresis panel 110: pixel electrode

120: common electrode 130: microcapsules

140: data voltage converter 141: NMOS transistor

142: PMOS transistor 150: storage electrode

160: selection transistor

Claims (10)

A data line for supplying a data voltage; A common electrode to which a common voltage is applied; Storage electrodes; A pixel electrode positioned between the common electrode and the storage electrode and receiving the data voltage from the data line to generate an electric field for display with the common electrode; And And a data voltage converter configured to receive the data voltage from the data line, convert the data voltage, and supply the converted data voltage to the storage electrode. The method of claim 1, And the data voltage converter converts the data voltage so that the potential difference between the common electrode and the pixel electrode is equal to or less than the potential difference between the pixel electrode and the storage electrode. The method of claim 1, And the data voltage converter is an inverter for inverting a phase of the data voltage. The data voltage converter of claim 1, A PMOS transistor including a first gate electrode, a first source electrode, and a first drain electrode; An NMOS transistor including a second gate electrode, a second source electrode, and a second drain electrode; A first node connected to the first and second gate electrodes and the data line, respectively; And A second node connected to the first and second drain electrodes and the storage electrode, respectively; The first source electrode is connected to a first common power supply terminal, And the second source electrode is connected to a second common power supply terminal. The method of claim 4, wherein The first common power supply terminal supplies a first voltage higher than the common voltage, And the second common power supply terminal supplies a second voltage lower than the common voltage. The method of claim 1, And a selection transistor configured to transfer the data voltage supplied from the data line to the data voltage converter only when the pixel electrode receives the data voltage. A method of driving an electrophoretic display device comprising a common electrode, a storage electrode, and a pixel electrode between the common electrode and the storage electrode, Supplying a common voltage to the common electrode; Supplying a data voltage through the data line; Transferring the data voltage supplied through the data line to the pixel electrode; Converting the data voltage supplied from the data line; And supplying the converted data voltage to the storage electrode. The method of claim 7, wherein The data voltage conversion step, And converting the data voltage so that the potential difference between the common electrode and the pixel electrode is equal to or less than the potential difference between the pixel electrode and the storage electrode. The method of claim 7, wherein The data voltage conversion step includes inverting the phase of the data voltage. The method of claim 7, wherein And the converted data voltage is supplied to the storage electrode only when the data voltage is transferred to the pixel electrode.
KR1020090127836A 2009-12-21 2009-12-21 Electrophoretic display apparatus and method for driving the same KR20110071308A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018048164A1 (en) * 2016-09-09 2018-03-15 주식회사 엘지화학 Transmittance-variable device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018048164A1 (en) * 2016-09-09 2018-03-15 주식회사 엘지화학 Transmittance-variable device
KR20180028750A (en) * 2016-09-09 2018-03-19 주식회사 엘지화학 A Device having changeable transparency
US10996459B2 (en) 2016-09-09 2021-05-04 Lg Chem, Ltd. Transmittance-variable element

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