WO2013104204A1 - 电子纸显示器件及驱动方法 - Google Patents

电子纸显示器件及驱动方法 Download PDF

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Publication number
WO2013104204A1
WO2013104204A1 PCT/CN2012/083453 CN2012083453W WO2013104204A1 WO 2013104204 A1 WO2013104204 A1 WO 2013104204A1 CN 2012083453 W CN2012083453 W CN 2012083453W WO 2013104204 A1 WO2013104204 A1 WO 2013104204A1
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WIPO (PCT)
Prior art keywords
pixel
thin film
electronic paper
display device
paper display
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Application number
PCT/CN2012/083453
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English (en)
French (fr)
Inventor
张卓
盖翠丽
Original Assignee
京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US13/876,651 priority Critical patent/US9311892B2/en
Publication of WO2013104204A1 publication Critical patent/WO2013104204A1/zh
Priority to US15/008,971 priority patent/US9886888B2/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/165Devices 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
    • G02F1/166Devices 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 characterised by the electro-optical or magneto-optical effect
    • G02F1/167Devices 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 characterised by the electro-optical or magneto-optical effect by electrophoresis
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2003Display of colours
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2007Display of intermediate tones
    • G09G3/2074Display of intermediate tones using sub-pixels
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2007Display of intermediate tones
    • G09G3/2077Display of intermediate tones by a combination of two or more gradation control methods
    • G09G3/2081Display of intermediate tones by a combination of two or more gradation control methods with combination of amplitude modulation and time modulation
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3433Control 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
    • G09G3/344Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10Intensity circuits
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/165Devices 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
    • G02F1/1675Constructional details
    • G02F1/1676Electrodes
    • G02F1/16766Electrodes for active matrices
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/04Structural and physical details of display devices
    • G09G2300/0421Structural details of the set of electrodes
    • G09G2300/0426Layout of electrodes and connections
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202Addressing of scan or signal lines
    • G09G2310/0205Simultaneous scanning of several lines in flat panels
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0224Details of interlacing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0252Improving the response speed

Definitions

  • Embodiments of the present invention relate to an electronic paper display device and a driving method. Background technique
  • Electronic paper display devices also known as electronic paper, digital paper
  • the thickness of the electronic paper display device can be made comparable to ordinary paper and can be reused; moreover, the electronic paper display device can display a dynamic picture. Therefore, the electronic segment.
  • Electrophoresis refers to the movement of charged particles in an applied electric field.
  • the electrophoretic display is a bistable display, and the particles in the electrophoresis fluid have two stable states. If there is no external force, this steady state does not change, so that the display pattern can be maintained for a long time. Therefore, the electrophoretic display has an extremely low power consumption level.
  • the microcup technology firstly creates an isolated lattice on the substrate, then injects the electrophoresis liquid into the lattice, and blocks the aggregation of the particles by the barrier wall between the lattices, thereby improving the stability and life of the electrophoretic display.
  • TFT Thin Film Transistor
  • the electrophoretic type electronic paper display device generally includes an upper substrate and a lower substrate disposed opposite to each other with a layer of electrophoretic particles interposed therebetween.
  • a common electrode is disposed on the upper substrate; a pixel electrode is disposed on the lower substrate, and the pixel electrodes are generally arranged in a matrix, and each pixel electrode corresponds to one pixel.
  • TFT active matrix For example, the pixel electrode and the drain electrode in the TFT are connected through the via, the source electrode in the TFT is connected to the signal line, and the gate electrode in the TFT is connected on the gate line. Based on the above structure, the gate of each pixel is controlled by the gate line.
  • the active layer becomes conductive to connect the drain electrode and the source electrode, and the pixel electrode connected to the TFT can be applied with a signal voltage by the signal line.
  • the signal voltage applied to the pixel electrode cooperates with a common voltage on the common electrode to form an electric field in the electrophoretic particle layer that moves the electrophoretic particles to form a desired pattern.
  • the electrophoretic electronic paper display device using the active matrix driving technology because the electrophoretic particles need to move in the liquid, the swimming speed itself is slow, resulting in a slow response speed of the electrophoretic electronic paper display device, and it is difficult to achieve gray Degree display.
  • the active backplane there are two reasons for this from the active backplane.
  • the leakage current of the electronic paper display device is large, in order to ensure good voltage stability, a large storage capacitor is required, but a large storage capacitor makes the charging and discharging time longer, which causes the refresh of the electronic paper display device.
  • the speed is slower; on the other hand, because the driving method of electronic paper is pulse width modulation (PWM), that is, a gray scale change must be achieved by dozens or even dozens of refreshes, which also leads to electronic paper. It is difficult to realize multi-gradation display of the display device, and the image refreshing speed is slow, and it is difficult to realize dynamic display. Moreover, the current driving method is to complete an image update by combining dozens or even dozens of screen refreshes. This ten or even dozens of refresh combinations is called a waveform. Different gray levels generally require dozens of pulse combinations.
  • PWM pulse width modulation
  • the frequency of the screen refresh is basically fixed (approximately 50 ⁇ )
  • the frequency at which each pixel voltage is refreshed is also fixed (ie, coincides with the screen refresh frequency), that is, the interval between pulses is fixed.
  • the pixel voltage for each refresh is also fixed (eg 0V, ⁇ 15V or ⁇ 30V). Therefore, there are fewer possible combinations and no more grayscale displays can be achieved. Summary of the invention
  • Embodiments of the present invention provide an electronic paper display device and a driving method which are fast in refreshing speed and capable of realizing multi-gradation display.
  • An aspect of the present invention provides an electronic paper display device including a plurality of pixels, a plurality of gate lines, and a plurality of data lines, each of the pixels including at least two thin film transistors, each of which is associated with a corresponding data line It is electrically connected to the corresponding gate line, and each thin film transistor is turned on once in one refresh period.
  • each pixel includes at least two sub-pixels, each sub-pixel includes at least two thin film transistors, each of which is electrically connected to a corresponding data line and a corresponding gate line, respectively, and Each thin film transistor is turned on once in a refresh cycle.
  • the electronic paper display device further includes: a resin protective insulating layer on the plurality of pixels.
  • the at least two thin film transistors are of a single gate structure or a double gate structure.
  • the at least two thin film transistors are polysilicon or oxide thin film transistors.
  • the at least two thin film transistors are organic thin film transistors.
  • Another aspect of the present invention provides a driving method of an electronic paper display device, including: the driving device acquires a gray level of each pixel in the electronic paper display device according to the input video data signal, according to the film included in the pixel a number N of transistors, and a gray level of the pixels, determining an opening order and a time interval of each thin film transistor in each pixel to form a gray scale display scheme; applying a gate voltage to a gate line corresponding to each thin film transistor of each pixel At the same time, a signal voltage is applied to the data lines corresponding to the respective thin film transistors of the respective pixels in accordance with the formed gray scale display scheme to respectively drive each pixel to exhibit its gray level, for example, N is a natural number, and ⁇ 2.
  • the applying a signal voltage to a data line corresponding to each thin film transistor of each pixel according to the formed gradation display scheme includes: each thin film transistor to each pixel according to the formed gradation display scheme
  • the corresponding data lines apply a plurality of sets of signal voltages of different set sizes to drive each pixel to exhibit its gray level.
  • the plurality of sets of signal voltages of different set sizes are 0V, soil 10V, ⁇ 15V or ⁇ 30V.
  • the opening time intervals of the respective thin film transistors are the same.
  • Embodiments of the present invention provide an electronic paper display device and a driving method thereof, wherein at least two independently controllable TFTs are included by one pixel, and the two TFTs are connected to respective corresponding gate lines and data lines, so that The e-paper display device can be refreshed at least twice during the refresh cycle. That is, in the electronic paper display device, at least two rows of TFTs are simultaneously turned on at each timing of scanning. Moreover, the above two refreshes can be matched with multiple sets of different voltages and different cycle intervals. This speeds up The refresh rate reduces the requirement for storage capacitors. And faster refresh rates allow for faster grayscale updates, and by setting different refresh cycle intervals, more pulse combination schemes are available for more and faster grayscale display. DRAWINGS
  • FIG. 1 is a schematic structural view of an electronic paper display device according to Embodiment 1 of the present invention.
  • FIG. 2 is a driving waveform diagram of a gate line in an electronic paper display device according to Embodiment 1 of the present invention
  • FIG. 3 is a waveform diagram of a pixel refresh signal of an electronic paper display device according to Embodiment 1 of the present invention
  • Fig. 4 is a view showing a waveform of a pixel refresh signal of different voltages which are not equally spaced in the electronic paper display device according to Embodiment 1 of the present invention. detailed description
  • Embodiments of the present invention provide an electronic paper display device including a plurality of pixels defined by a plurality of gate lines and a plurality of data lines, the plurality of pixels being arranged, for example, in a matrix array manner.
  • Each pixel includes at least two Thin Film Transistors (TFTs).
  • TFTs Thin Film Transistors
  • Each TFT is electrically connected to a corresponding data line and a gate line, respectively, and each TFT is opened once in one refresh period, so the electronic paper display device is refreshed at least twice in one refresh period, which improves the electronic paper Displays the refresh rate of the device.
  • Each of the pixels in the electronic paper display device of the embodiment of the present invention may further include at least two sub-pixels, each of the sub-pixels including at least two TFTs, each of which is electrically connected to a corresponding data line and a gate line, respectively, and is refreshed Each TFT is turned on once in the cycle, which further improves the refresh rate of the electronic paper display device.
  • the electronic paper display device of the embodiment of the present invention may further include a protective insulating layer (PVX) on the pixel, the material of which may be a resin for increasing the aperture ratio.
  • PVX protective insulating layer
  • At least two TFTs of each pixel or sub-pixel in the electronic paper display device of the embodiment of the present invention may be a single gate structure or a double gate structure.
  • a double-gate TFT has a small leakage current, which reduces the requirement for storage capacitors.
  • At least two TFTs of each pixel or sub-pixel in the electronic paper display device of the embodiment of the present invention may be used to charge and discharge a voltage to the same pixel, and the voltage may be 0V, ⁇ 10V, ⁇ 15V or ⁇ 30V.
  • grayscale combinations can be achieved.
  • high-voltage display such as ⁇ 30V
  • low voltage such as ⁇ 10V
  • At least two TFTs of each pixel or sub-pixel have the same opening period, but the period intervals may be different.
  • the at least two TFTs are driven using different open period intervals, more gray scale combinations can be realized, and in particular, when a different voltage is applied to the at least two TFTs as described above, a high voltage can be supplied to the pixels. After that, a low voltage is quickly applied, and finer grayscale control can be performed after a quick response.
  • the at least two TFTs of each pixel or sub-pixel in the electronic paper display device of the embodiment of the present invention may be a high mobility semiconductor active layer such as polysilicon (p-Si) or oxide thin film transistor (Oxide TFT) to achieve more Fast charging speed.
  • a high mobility semiconductor active layer such as polysilicon (p-Si) or oxide thin film transistor (Oxide TFT) to achieve more Fast charging speed.
  • At least two TFTs of each pixel or sub-pixel in the electronic paper display device of the embodiment of the present invention may be an organic thin film transistor (OTFT) in order to obtain flexibility.
  • OTFT organic thin film transistor
  • At least two TFTs of each pixel or sub-pixel in the electronic paper display device of the embodiment of the present invention may be a single gate structure or a double gate structure.
  • the electronic paper display device includes a plurality of gate lines (labeled as Gatel, Gate 2, etc., respectively) and a plurality of data lines (labeled as Datal, Data2, . . . Etc., these gate lines and data lines cross each other to define an array of pixels, including pixel 1, pixel 2, ... pixel 16, etc.
  • gate lines labeled as Gatel, Gate 2, etc.
  • Datal Data2, . . . Etc.
  • the pixel 1 includes a TFT 11 and a TFT 12 pixel 2 including a TFT 21 and a TFT 22;
  • the pixel 3 includes a TFT 31 and a TFT 32 pixel 4 including a TFT 41 and a TFT 42;
  • the pixel 5 includes a TFT 51 and a TFT 52 pixel 6 including a TFT 61 and a TFT 62;
  • the pixel 7 includes a TFT 71 and a TFT 72 pixel 8 including a TFT 81 and a TFT 82;
  • the pixel 9 includes a TFT 91 and a TFT 92.
  • the pixel 10 includes a TFT 101 and a TFT 102;
  • the pixel 11 includes a TFT 111 and a TFT 112.
  • the pixel 12 includes a TFT 121 and a TFT 122.
  • the pixel 13 includes a TFT 131 and a TFT 132.
  • the pixel 14 includes a TFT 141 and a TFT 142.
  • the pixel 15 includes a TFT 151 and a TFT 152.
  • the pixel 16 includes a TFT 161 and a TFT 162.
  • Pixels 1-16 are arranged in a 4*4 matrix. For each pixel, there are two gate lines and two data lines corresponding to two of the TFTs. Of course, embodiments of the present invention are not limited to the above-described 4*4 matrix arrangement, and may be any n*m matrix arrangement as needed. n, m can be a natural number greater than 1.
  • the data line Data1 is electrically connected to the TFT 11, the TFT 51, the TFT 91, and the TFT 131;
  • the data line Data2 is electrically connected to the TFT 12, the TFT 52, the TFT 92, and the TFT 132;
  • the data line Data3 is electrically connected to the TFT 21, the TFT 61, the TFT 101, and the TFT 141;
  • the data line Data4 is electrically connected to the TFT 22, the TFT 62, the TFT 102, and the TFT 142;
  • the data line Data5 is electrically connected to the TFT 31, the TFT 71, the TFT 111, and the TFT 151;
  • the data line Data6 is electrically connected to the TFT32, the TFT72, the TFT 112, and the TFT 152;
  • the data line Data7 is electrically connected to the TFT 41, the TFT 81, the TFT 121, and the TFT 161;
  • the data line Data8 is electrically connected to the TFT 42, TFT 82, TFT 122, and TFT 162.
  • the data line Datal-8 is, for example, connected to a data driver.
  • the gate line Gatel is electrically connected to the TFT 11, the TFT 21, the TFT 31, and the TFT 41;
  • the gate line Gate 2 is electrically connected to the TFT 12, the TFT 22, the TFT 32, and the TFT 42;
  • the gate line Gate3 is electrically connected to the TFT 51, the TFT 61, the TFT 71, and the TFT 81;
  • the gate line Gate4 is electrically connected to the TFT 52, the TFT 62, the TFT 72, and the TFT 82;
  • the gate line Gate5 is electrically connected to the TFT 91, the TFT 101, the TFT 111, and the TFT 121;
  • the gate line Gate6 is electrically connected to the TFT 92, the TFT 102, the TFT 112, and the TFT 122;
  • the gate line Gate7 is electrically connected to the TFT 131, the TFT 141, the TFT 151, and the TFT 161;
  • the gate line Gate8 is electrically connected to the TFT 132, the TFT 142, the TFT 152, and the TFT 162.
  • the gate line Gatel-8 is, for example, connected to a gate driver.
  • the driving waveform signal as shown in FIG. 2 is used to drive the gate line Gatel,
  • Gate2-Gate 8 so that the TFTs in the above pixels are respectively turned on once in one refresh period, so that two rows of TFTs are turned on at the same time, and each pixel is charged and discharged twice in one refresh period.
  • the signal of each gate line is at a high level, a row of pixel TFTs corresponding to the gate line will be in an on state, that is, the source and drain electrodes are electrically connected to each other, so that the pixels can be charged and discharged through the corresponding data lines.
  • the odd-numbered first gate lines Gate l, . . 2n+l gate lines Gate 2 ⁇ +1 , ..., 4 ⁇ -1 gate lines Gate 4n-l which are sequentially scanned from small to large; and evenly numbered 2n+2 grids
  • the line Gate 2n+2 to the 4nth gate line Gate 4n are then sequentially scanned from the second gate line Gate 2 to the 2nth gate line Gate 2n from small to large and then from large to small.
  • the first gate line Gate 1 and the 2n+2 gate lines Gate 2n+2 are scanned, and a turn-on voltage is applied, so that the first row and the n+1th row of pixels are turned on;
  • the third gate line Gate 3 and the second n+4 gate line Gate 2n+4 are scanned, and a turn-on voltage is applied, so that the second row and the n+th row of pixels are turned on;
  • the 2n-1th gate line Gate 2n-1 and the 4nth gate line Gate 4n are scanned, and a turn-on voltage is applied, so that the nth row and the 2nth row of pixels are turned on;
  • the 2n+1th gate line Gate 2n+1 and the second gate line Gate 2 are scanned, and a turn-on voltage is applied, so that the n+1th row and the 1st row of pixels are turned on;
  • the 4n-1th gate line Gate 4n-1 and the 2nth gate line Gate 2n are scanned, and an ON voltage is applied, so that the 2nth row and the nth row of pixels are turned on.
  • the scan of one refresh cycle ends.
  • each row of pixels is turned on twice, with the time required to scan n rows before and after.
  • the row of pixels can be charged separately by different sets of data lines. For example, for the first row of pixels, when first scanned, each pixel in the row of pixels is charged and discharged by the odd-numbered data lines (ie, data lines Data1, Data3, ...); At the time of scanning, each of the pixels in the row is charged and discharged by the even-numbered data lines (i.e., the data lines Data2, Data4, ).
  • the odd-numbered data lines are used for scanning to charge and discharge the pixels of the corresponding row;
  • even-numbered 2n+2 gate lines Gate 2n+2 to 4n gate lines Gate 4n and from the 2nd gate line Gate 2 to the 2nth gate line Gate 2n, even-numbered data lines are used for scanning.
  • Charge and discharge the pixels of the corresponding row The same pixel can be charged and discharged with the same voltage or a different voltage as shown in FIG. As shown in FIG.
  • the cycle of two charge and discharge is the same, but the cycle intervals may be the same or different as shown in FIG. This can be done by changing the scanning method. Different scanning methods can have different scanning cycles.
  • the pixels L1, 1 ⁇ 2, .11 indicate the first pixel of the pixels of the first, second, ..., n rows, respectively.
  • the time interval between each row of pixels being turned on and off twice is the time required to scan n rows, but is not limited thereto, and may be, for example, any natural number smaller than n.
  • the interval time is the time required to scan one line
  • the pixel in the first row is turned on
  • the pixel in the second row is also turned on
  • the pixel in the third row is also turned on
  • the 2nd-th row of pixels is turned on
  • the 2nth row of pixels is also turned on
  • the 1st row of pixels is also Was opened.
  • the two open time intervals for the first row of pixels are not the time required to scan one line, but do not affect the performance of the entire display device.
  • the present embodiment also provides a driving method of an electronic paper display device which can be used for driving the electronic paper display device of the present invention, for example, driving the electronic paper display device of the above-described Embodiment 1.
  • the driving method of this embodiment is as follows.
  • the driving device acquires a gray level of each pixel in the electronic paper display device according to the input video data signal, and determines each thin film transistor in each pixel according to the number N of thin film transistors included in the pixel and the gray level of the pixel.
  • the order and time interval are opened to form a gray scale display scheme. For example, only the on and off order and time of each thin film transistor can be determined.
  • the opening time intervals of the respective thin film transistors may be the same or different.
  • the driving device applies a gate voltage to the gate line corresponding to each thin film transistor of each pixel to gate the corresponding pixel, and at the same time, the driving device applies the data line corresponding to each thin film transistor of each pixel according to the gray scale display scheme.
  • the signal voltage is used to drive each pixel to exhibit its gray level, such as brightening or darkening.
  • N is a natural number, and ⁇ ⁇ 2.
  • the driving device can apply a plurality of sets of signal voltages of different set sizes to the data lines corresponding to the thin film transistors of the respective pixels according to the gray scale display scheme, respectively, and drive each pixel to display the gray level thereof, thereby obtaining more gray. Degree combination to achieve the set grayscale display scheme.
  • the same pixel can be charged and discharged.
  • the voltage can be 0V, ⁇ 10V, ⁇ 15V or ⁇ 30V;
  • grayscale combinations can be achieved, for example, high-voltage display can be used in high-definition display for high-speed display, even dynamic video, in fine grayscale control. , use low voltage to achieve finer and more grayscale.
  • the opening periods of the at least two TFTs are the same, that is, as long as the at least two TFTs are respectively turned on once in one refresh period, the opening period of each TFT is the same.
  • each pixel contains two independently controllable TFTs, and a total of 4*4 of 4 rows of pixels, and one refresh period includes four refreshing times as an example for description.
  • Each row of pixels has two gate lines, and there are eight Gate lines.
  • the gate lines Gatel and Gate2 respectively control two TFTs of the first row of pixels, and the gate lines Gate3 and Gate4 respectively control two TFTs of the second row of pixels, the gate lines.
  • Gate5 and Gate6 respectively control two TFTs of the third row of pixels, and gate lines Gate7 and Gate8 respectively control the fourth row of pixels The two TFTs.
  • the gate lines Gatel and Gate6 are turned on, and the pixels in the first row and the third row are respectively turned on, and the voltages can be written through the respective independent data lines;
  • the gate lines Gate3 and Gate8 are turned on, and the pixels in the second row and the fourth row are respectively turned on, and the voltage can be written through the independent data lines; in a refresh cycle.
  • each of the pixels in the 4th row and the 2nd row has a TFT turned on, and the voltage can be written through the respective independent data lines.
  • the opening period of each TFT is the same, and the TFTs of two rows of pixels are simultaneously turned on in the same refreshing time of one refresh period.
  • the at least two TFTs are driven using different open period intervals, more gray scale combinations can be realized, and in particular, when a different voltage is applied to the at least two TFTs as described above, a high voltage can be supplied to the pixels. After that, a low voltage is quickly applied, and finer grayscale control can be performed after a quick response.
  • each pixel shown in FIG. 1 includes two independently controllable TFTs, and has 4 rows of 4*4 pixels, and a refresh cycle includes four refreshing times as an example.
  • Each row of pixels has two gate lines, and there are eight Gate lines.
  • the gate lines Gatel and Gate2 respectively control two TFTs of the first row of pixels, and the gate lines Gate3 and Gate4 respectively control two TFTs of the second row of pixels, the gate lines.
  • Gate5 and Gate6 respectively control two TFTs of the third row of pixels, and gate lines Gate7 and Gate8 respectively control the two TFTs of the fourth row of pixels.
  • the gate lines Gatel and Gate4 are turned on, and the pixels in the first row and the second row are respectively turned on, and the voltages can be written through the respective independent data lines;
  • the gate lines Gate3 and Gate6 are turned on, and the pixels in the second row and the third row are respectively turned on, and the voltage can be written through the independent data lines;
  • the gate lines Gate5 and Gate8 are turned on, and the pixels of the third row and the fourth row are respectively turned on, and the voltage can be written through the independent data lines; the fourth moment in a refresh cycle When the gate lines Gate7 and Gate2 are turned on, the pixels in the fourth row and the first row are respectively turned on, and can be written by the respective independent data lines.
  • the opening period of each TFT is the same, but the time interval of opening the two TFTs of the same pixel may be different, that is, the period interval is different, and the same refresh time of one refresh period can be realized, and two rows are simultaneously opened.
  • Pixel TFT the time interval of opening the two TFTs of the same pixel may be different, that is, the period interval is different, and the same refresh time of one refresh period can be realized, and two rows are simultaneously opened.
  • the embodiments of the present invention disclose an electronic paper display device and a driving method thereof.
  • at least two independently controllable TFTs are included by one pixel, and the two TFTs have independent gate lines and data lines, so that at least two cycles can be refreshed during a refresh period of the conventional electronic paper display device.
  • at least two rows of TFTs are simultaneously turned on at each moment in the electronic paper display device.
  • the above two refreshes can be matched with multiple sets of different voltages and different cycle intervals. This speeds up the refresh rate and reduces the need for storage capacitors. And faster refresh rates allow for faster grayscale updates, with more pulse-combining schemes by setting different refresh cycle intervals for more and faster grayscale display.

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Abstract

一种电子纸显示器件及其驱动方法。该电子纸显示器件包括多个像素,其中每个像素包括至少两个薄膜晶体管,每个薄膜晶体管分别与相应的数据线和栅极线电连接,并且在一个刷新周期内每个薄膜晶体管分别打开一次。该电子纸显示器件可加快刷新速度,降低对存储电容的要求,实现更快的灰度更新。

Description

电子纸显示器件及驱动方法 技术领域
本发明的实施例涉及一种电子纸显示器件及驱动方法。 背景技术
电子纸显示器件(也称为电子纸、 数字纸)具有普通纸张显示信息的特 点与计算机显示屏的特点。 电子纸显示器件的厚度可以制备得与普通纸张相 当且能够重复利用; 而且, 电子纸显示器件能够显示动态画面。 因此, 电子 段。
目前人们研究较多的是基于电泳技术的电子纸显示器件。 电泳是指带电 粒子在施加的电场中运动。 电泳显示属于一种双稳态显示, 电泳液中的粒子 都有两个稳定状态。 如果没有外力作用, 这种稳态是不会改变的, 因而能够 长久的保持显示图案。 所以, 电泳显示具有极低的功耗水平。
电泳型电子纸显示器件的研究虽然早在 70年代就已经开始了。为解决其 稳定性差、 寿命短等问题, 美国麻省理工学院的研究者通过将电泳粒子进行 微胶嚢化处理,解决了粒子的自然凝聚问题, 大大提高了电泳显示的稳定性。 目前微胶嚢电子墨水已经由 "E-INK"公司成功实现了产业化。 一些公司推出 了基于微胶嚢电子墨水技术的电子书产品。 美国的 "Sipix"公司则提出了另外 一种提高电泳溶液稳定性的手段, 即微杯 (micro-cup)技术。 微杯技术通过首 先在基板上制作出有隔离的格子, 然后向格子中注入电泳液, 通过格子之间 的隔离壁阻隔电泳显示粒子的凝聚, 因此提高了电泳显示的稳定性和寿命。
无论微胶嚢技术还是微杯技术, 要想实现文本信息的显示, 都需要使用 有源矩阵驱动技术。 例如, 薄膜晶体管 (Thin Film Transistor , TFT )技术就是 实现有源矩阵的一种方式。
电泳型电子纸显示器件一般包括彼此相对设置的上衬底和下衬底, 二者 之间填充有一层电泳粒子。上衬底上设有公共电极; 下衬底上设有像素电极, 像素电极一般呈矩阵状布设, 每个像素电极对应一个像素。 以 TFT有源矩阵 为例 ,像素电极与 TFT中的漏电极通过过孔相连, TFT中的源电极与信号线 相连, TFT中的栅电极连接在栅线上。 基于上述结构, 以栅线控制各个像素 的选通。 在 TFT的栅电极通入选通电压时, 有源层变得导通将漏电极和源电 极联通, 则与该 TFT相连的像素电极可以被信号线施加以信号电压。 该施加 在像素电极上的信号电压配合公共电极上的公共电压在电泳粒子层中形成电 场, 该电场使电泳粒子移动以形成所需的图案。
但是, 釆用有源矩阵驱动技术的电泳型电子纸显示器件, 由于电泳粒子 需要在液体中泳动, 泳动速度本身较慢, 导致电泳型电子纸显示器件响应速 度比较慢, 难以实现多灰度显示。 除上述原因之外, 从有源背板上看, 还有 以下两方面原因。 一方面是因为电子纸显示器件的漏电流较大, 为保证良好 的电压稳定性,必须有大的存储电容,但大的存储电容使得充放电时间较长, 该因素使得电子纸显示器件的刷新速度较慢; 另一方面是因为电子纸的驱动 方式为脉冲宽度调制(PWM, Pulse Width Modulation )驱动, 即一个灰度变 化必须通过十几次甚至几十次刷新才能实现, 这也导致电子纸显示器件的多 灰度显示实现较为困难, 图像刷新速度慢, 难以实现动态显示。 而且, 目前 的驱动方式是通过十几次甚至几十次的屏幕刷新组合起来完成一次图像的更 新, 这种十几次甚至几十次的刷新组合被称为脉冲组合(waveform ) 。 不同 的灰度一般需要几十个脉冲组合。 因为屏幕刷新的频率基本是固定的 (大约 50Ηζ ) , 所以每个像素电压刷新一次的频率也是固定的(即与屏幕刷新频率 一致) , 即脉冲之间的间隔是固定的。 而且, 每次刷新的像素电压也是固定 的 (如 0V, ± 15V或 ± 30V ) 。 所以, 可能的组合也就较少, 无法实现更多 的灰度显示。 发明内容
本发明的实施例提供了一种刷新速度快且能够实现多灰度显示的电子纸 显示器件及驱动方法。
本发明的一个方面提供了一种电子纸显示器件, 包括多个像素、 多条栅 线和多条数据线, 每个像素包括至少两个薄膜晶体管, 每个薄膜晶体管分别 与相应的的数据线和相应的栅线电连接, 且在一个刷新周期内每个薄膜晶体 管分别打开一次。 在该电子纸显示器件之中, 例如, 每个像素包括至少两个子像素, 每个 子像素包括至少两个薄膜晶体管, 每个薄膜晶体管分别与相应的数据线和相 应的栅线电连接, 且在一个刷新周期内每个薄膜晶体管分别打开一次。
在该电子纸显示器件之中, 例如, 所述电子纸显示器件还包括: 位于所 述多个像素上的树脂保护绝缘层。
在该电子纸显示器件之中, 例如, 所述至少两个薄膜晶体管为单栅结构 或双栅结构。
在该电子纸显示器件之中, 例如, 所述至少两个薄膜晶体管为多晶硅或 氧化物薄膜晶体管。
在该电子纸显示器件之中, 例如, 所述至少两个薄膜晶体管为有机薄膜 晶体管。
本发明的另一个方面还提供了一种电子纸显示器件的驱动方法, 包括: 驱动装置根据输入的视频数据信号, 获取电子纸显示器件中各像素的灰度等 级, 根据像素中所包含的薄膜晶体管的个数 N, 以及像素的灰度等级, 确定 各像素中各薄膜晶体管的打开次序以及时间间隔以形成灰度显示方案; 向各 像素的各薄膜晶体管所对应的栅线施加选通电压的同时, 按照所形成的灰度 显示方案向各像素的各薄膜晶体管所对应的数据线施加信号电压以分别驱动 各像素呈现其灰度等级, 例如, N为自然数, 且^^≥2。
该驱动方法之中, 例如, 所述按照所形成的灰度显示方案向各像素的各 薄膜晶体管所对应的数据线施加信号电压包括: 按照所形成的灰度显示方案 向各像素的各薄膜晶体管所对应的数据线施加多组不同设定大小的信号电压 分别驱动各像素呈现其灰度等级。
该驱动方法之中,例如,所述多组不同设定大小的信号电压为 0V、土 10V、 ± 15V或 ± 30V。
该驱动方法之中, 例如, 所述各薄膜晶体管的打开时间间隔相同。
本发明的实施例提供了一种电子纸显示器件及其驱动方法, 其中通过一 个像素包括至少两个可独立控制的 TFT,这两个 TFT与各自相应的栅线和数 据线连接, 这样在传统电子纸显示器件刷新一次的周期内, 可以至少刷新两 次。即所述电子纸显示器件中,扫描的每个时刻同时至少有两行 TFT被打开。 而且上述的两次刷新可以配合多组不同电压及不同周期间隔。 这样既加快了 刷新速度, 又可以降低对存储电容的要求。 而且更快的刷新速度可以实现更 快的灰度更新,通过设置不同的刷新周期间隔,可提供更多的脉冲组合方案, 从而实现更多、 更快的灰度显示。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对实施例的附图作 简单地介绍,显而易见地,下面描述中的附图仅仅涉及本发明的一些实施例, 而非对本发明的限制。
图 1是本发明实施例 1所述的电子纸显示器件的结构示意图;
图 2是本发明实施例 1所述的电子纸显示器件中栅线的驱动波形图; 图 3是本发明实施例 1所述的电子纸显示器件中等间隔不同电压的像素 刷新信号波形图;
图 4是本发明实施例 1所述的电子纸显示器件中不等间隔不同电压的像 素刷新信号波形图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本发 明实施例的附图,对本发明实施例的技术方案进行清楚、 完整地描述。显然, 所描述的实施例是本发明的一部分实施例, 而不是全部的实施例。 基于所描 述的本发明的实施例, 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例, 都属于本发明保护的范围。
除非另作定义, 此处使用的技术术语或者科学术语应当为本发明所属领 域内具有一般技能的人士所理解的通常意义。 本发明专利申请说明书以及权 利要求书中使用的 "第一" 、 "第二" 以及类似的词语并不表示任何顺序、 数量或者重要性,而只是用来区分不同的组成部分。同样, "一个 "或者 "一" 等类似词语也不表示数量限制, 而是表示存在至少一个。 "连接" 或者 "相 连" 等类似的词语并非限定于物理的或者机械的连接, 而是可以包括电性的 连接, 不管是直接的还是间接的。 "上" 、 "下" 、 "左" 、 "右" 等仅用 于表示相对位置关系, 当被描述对象的绝对位置改变后, 则该相对位置关系 也相应地改变。 本发明实施例提供了一种电子纸显示器件, 其包括通过多条栅线和多条 数据线定义的多个像素, 该多个像素例如以矩阵阵列方式排列。 每个像素包 括至少两个薄膜晶体管 (Thin Film Transistor, TFT )。每个 TFT分别与相应的 数据线和栅线电连接, 且在一个刷新周期内每个 TFT分别打开一次, 因此一 个刷新周期内所述电子纸显示器件至少被刷新两次, 这提高了电子纸显示器 件的刷新速度。
本发明实施例的电子纸显示器件中的每个像素还可以包括至少两个子像 素,每个子像素包括至少两个 TFT, 每个 TFT分别与相应的数据线和栅线电 连接, 且在一个刷新周期内每个 TFT分别被打开一次, 这进一步提高了电子 纸显示器件的刷新速度。
本发明实施例的电子纸显示器件还可以包括位于所述像素上的保护绝缘 层(PVX ) , 其材料可以为树脂, 用于增加开口率。
本发明实施例的电子纸显示器件中每个像素或子像素的至少两个 TFT 可以为单栅结构或双栅结构。 双栅结构的 TFT具有较小的漏电流, 可以降低 对存储电容的要求。
本发明实施例的电子纸显示器件中每个像素或子像素的至少两个 TFT 可以用于对同一像素充放电压,所述电压可以为 0V、 ± 10V、 ± 15V或 ± 30V。
当对所述至少两个 TFT施加多组不同电压时, 可以实现更多的灰度组 合。 例如, 可以在黑白显示时用高电压 (如 ± 30V ) 以实现高速显示, 甚至 是动态视频; 而在精细灰度控制中, 使用低电压 (如 ± 10V ) , 以实现更精 细和更多的灰度。
本发明实施例的电子纸显示器件中每个像素或子像素的至少两个 TFT 的打开周期相同, 但周期间隔可以不同。
当使用不同的打开周期间隔驱动所述至少两个 TFT时,便可以实现更多 的灰度组合, 特别是结合上述对所述至少两个 TFT施加不同电压, 则可在对 像素提供一个高电压后, 很快再给一个低电压, 便可以在快速响应后进行更 精细地灰度控制。
本发明实施例的电子纸显示器件中每个像素或子像素的至少两个 TFT 可以为多晶硅(p-Si ) , 氧化物薄膜晶体管 (Oxide TFT )等高迁移率半导体 有源层, 以实现更快的充电速度。 本发明实施例的电子纸显示器件中每个像素或子像素的至少两个 TFT 可以为有机薄膜晶体管 (OTFT ) , 以便获得柔性。
本发明实施例的电子纸显示器件中每个像素或子像素的至少两个 TFT 可以为单栅结构或双栅结构。
实施例 1
如图 1所示, 所述的电子纸显示器件包括多条栅线(分别标注为 Gatel、 Gate2... ...等)、 多条数据线(分别标注为 Datal、 Data2... ...等), 这些栅线 和数据线彼此交叉从而定义了像素的阵列, 该像素阵列包括像素 1、 像素 2... ...像素 16... ...等。
像素 1包括 TFT11和 TFT12 像素 2包括 TFT21和 TFT22;
像素 3包括 TFT31和 TFT32 像素 4包括 TFT41和 TFT42;
像素 5包括 TFT51和 TFT52 像素 6包括 TFT61和 TFT62;
像素 7包括 TFT71和 TFT72 像素 8包括 TFT81和 TFT82;
像素 9包括 TFT91和 TFT92 像素 10包括 TFT101和 TFT102;
像素 11包括 TFT111和 TFT112 像素 12包括 TFT121和 TFT122; 像素 13包括 TFT131和 TFT132 像素 14包括 TFT141和 TFT142; 像素 15包括 TFT151和 TFT152 像素 16包括 TFT161和 TFT162。 像素 1-16以 4*4的矩阵排列。对于每个像素均有两条栅线和两条数据线 与其中的两个 TFT分别对应。 当然, 本发明的实施例不限于上述 4*4的矩阵 排列, 根据需要可以为任何的 n*m的矩阵排列。 n、 m可以为大于 1的自然 数。
数据线 Datal与 TFT11、 TFT51、 TFT91和 TFT131电连接;
数据线 Data2与 TFT12、 TFT52、 TFT92和 TFT 132电连接;
数据线 Data3与 TFT21、 TFT61、 TFT101和 TFT141电连接;
数据线 Data4与 TFT22, TFT62、 TFT 102和 TFT 142电连接;
数据线 Data5与 TFT31、 TFT71、 TFT 111和 TFT 151电连接;
数据线 Data6与 TFT32、 TFT72、 TFT 112和 TFT 152电连接;
数据线 Data7与 TFT41、 TFT81、 TFT121和 TFT161电连接;
数据线 Data8与 TFT42、 TFT82、 TFT 122和 TFT 162电连接。
数据线 Datal-8例如连接到一个数据驱动器。 栅线 Gatel与 TFT11、 TFT21、 TFT31和 TFT41电连接; 栅线 Gate2与 TFT12、 TFT22、 TFT32和 TFT42电连接;
栅线 Gate3与 TFT51、 TFT61、 TFT71和 TFT81电连接;
栅线 Gate4与 TFT52、 TFT62、 TFT72和 TFT82电连接;
栅线 Gate5与 TFT91、 TFT101、 TFT111和 TFT121电连接;
栅线 Gate6与 TFT92、 TFT 102、 TFT112和 TFT 122电连接;
栅线 Gate7与 TFT131 , TFT141、 TFT151和 TFT161电连接;
栅线 Gate8与 TFT132, TFT142, TFT152和 TFT162电连接。
栅线 Gatel-8例如连接到一个栅驱动器。
在一个实施例中, 利用如图 2所示的驱动波形信号来驱动栅线 Gatel、
Gate2- Gate8, 使得在一个刷新周期内上述像素中的 TFT分别打开一次, 这 样就在同一时刻有两行 TFT被打开,则每个像素在一个刷新周期内被充放电 两次。 当每条栅线的信号处于高电平时, 与该栅线对应的一行像素 TFT将处 于导通状态, 即源漏电极彼此电连接, 从而可以通过相应的数据线为像素充 放电。
如图 2所示, 对于具有 2n行像素(则相应地栅线具有 4n条 ) 的像素阵 歹 |J , 在一个刷新周期内, 奇数编号的第 1条栅线 Gate l , ... ... , 第 2n+l条栅 线 Gate 2η+1 , ...... , 第 4η-1条栅线 Gate 4n-l , 从小到大被依次扫描; 同时 偶数编号的第 2n+2条栅线 Gate 2n+2至第 4n条栅线 Gate 4n, 然后再从第 2 条栅线 Gate 2到第 2n条栅线 Gate 2n, 从小到大再从大到小被依次扫描。 具 体说明 ^下。
在第 1时刻, 第 1条栅线 Gate 1和第 2n+2条栅线 Gate 2n+2被扫描,被 施加导通电压, 从而第 1行和第 n+1行像素被打开;
在第 2时刻, 第 3条栅线 Gate 3和第 2n+4条栅线 Gate 2n+4被扫描,被 施加导通电压, 从而第 2行和第 n+2行像素被打开; 在第 n时刻, 第 2n-l条栅线 Gate 2n-l和第 4n条栅线 Gate 4n被扫描, 被施加导通电压, 从而第 n行和第 2n行像素被打开;
在第 n+1时刻, 第 2n+l条栅线 Gate 2n+l和第 2条栅线 Gate 2被扫描, 被施加导通电压, 从而第 n+1行和第 1行像素被打开; 在第 2n时刻, 第 4η-1条栅线 Gate 4n-l和第 2n条栅线 Gate 2n被扫描, 被施加导通电压,从而第 2n行和第 n行像素被打开。 至此, 一个刷新周期的 扫描结束。
由此, 在一个刷新周期之中, 每行像素都被打开两次, 前后间隔 n行扫 描所需的时间。
对于每行像素, 在前后两次被打开时, 可以通过不同数据线组分别对于 这一行像素进行充电。 例如, 对于第 1行像素, 当第一次被扫描时, 通过奇 数编号的数据线(即数据线 Datal、 Data3... )对于该行像素中的每个像素充 放电;当第二次被扫描时,通过偶数编号的数据线(即数据线 Data2、Data4... ) 对于该行像素中的每个像素充放电。
例如,对于图 2所示的情形,对于奇数编号的第 1条栅线 Gate 1至第 4n-l 条栅线 Gate 4n-l , 扫描时使用奇数编号的数据线对相应行的像素充放电; 对 于偶数编号的第 2n+2条栅线 Gate 2n+2至第 4n条栅线 Gate 4n, 再从第 2条 栅线 Gate 2到第 2n条栅线 Gate 2n, 扫描时使用偶数编号的数据线对相应行 的像素充放电。 可以对同一像素充放相同电压或如图 3所示的不同电压。 如 图 3所示, 在一个刷新周期之中, 当第一行像素在第 1时刻和第 n+1时刻分 别被打开时, 对于第一行中的某个像素(例如该行第一个像素 L1 )分别施加 低与高的信号电压; 同样, 当第 2行像素在第 2时刻和第 n时刻分别被打开 时, 对于第二行中的某个像素(例如该行的第一个像素 L2 )分别施加低与高 的信号电压 ......。
同时, 两次充放电的周期是相同的, 但周期间隔可以相同或如图 4所示 的不同。 这可以通过改变扫描方式来实现, 不同的扫描方式可以有不同的扫 描周期。
在图 3和图 4中, 像素 Ll、 1^2..丄11分别表示第 1、 2...n行像素中第一 个像素。
在上述实施例中, 每行像素被前后打开两次所间隔的时间为扫描 n行所 需的时间, 但不限于此, 例如可以是小于 n的任意自然数。 例如, 当间隔时 间为扫描 1行所需的时间时, 则当第 1行像素被打开时, 第 2行像素也被打 开; 当第 2行像素被打开时, 第 3行像素也被打开; ... ...; 当第 2n-l行像素 被打开时, 第 2n行像素也被打开; 当第 2n行像素被打开时, 第 1行像素也 被打开。 在该示例中, 对于第 1行像素前后两次打开时间间隔不为扫描 1行 所需的时间, 但并不影响整个显示装置的表现。
本实施例还提供了一种电子纸显示器件的驱动方法, 所述电子纸显示器 件的驱动方法可以用于驱动本发明的电子纸显示器件, 例如驱动上述实施例 1的电子纸显示器件。
该实施例的驱动方法如下所述。 驱动装置根据输入的视频数据信号, 获 取电子纸显示器件中各像素的灰度等级, 根据像素中所包含的薄膜晶体管的 个数 N, 以及像素的灰度等级, 确定各像素中各薄膜晶体管的打开次序以及 时间间隔以形成灰度显示方案。 例如, 可以仅确定各薄膜晶体管的通、 断次 序及时间。 所述各薄膜晶体管的打开时间间隔可以相同或不同。
驱动装置向各像素的各薄膜晶体管所对应的栅线施加选通电压, 以便选 通对应的像素, 与此同时, 驱动装置按照灰度显示方案向各像素的各薄膜晶 体管所对应的数据线施加信号电压, 以分别驱动各像素呈现其灰度等级, 例 如变亮或变暗。 N为自然数, 且^^≥2。
进一步地, 驱动装置可以按照灰度显示方案向各像素的各薄膜晶体管所 对应的数据线施加多组不同设定大小的信号电压分别驱动各像素呈现其灰度 等级, 则能够得到更多的灰度组合, 以实现设定的灰度显示方案。
在所述至少两个 TFT分别打开时, 可以对同一像素充放电压。 例如, 所 述电压可以为 0V、 ± 10V、 ± 15V或 ± 30V;
当对所述至少两个 TFT施加多组不同电压时,便可以实现更多的灰度组 合, 例如可以在黑白显示时用高电压以实现高速显示, 甚至是动态视频, 在 精细灰度控制中, 使用低电压, 以实现更精细和更多的灰度。
实施例 2
在本实施例中, 所述至少两个 TFT的打开周期相同, 即只要满足在一个 刷新周期内所述至少两个 TFT分别打开一次, 每个 TFT的打开周期相同。
以图 1所示每个像素含有两个可独立控制的 TFT, 且共有 4*4的 4行像 素, 一个刷新周期包括 4个刷新时间为例进行说明。 每行像素有 2条栅线, 则共有 8条 Gate线, 栅线 Gatel和 Gate2分别控制第一行像素的两个 TFT, 栅线 Gate3和 Gate4分别控制第二行像素的两个 TFT, 栅线 Gate5和 Gate6 分别控制第三行像素的两个 TFT, 栅线 Gate7和 Gate8分别控制第四行像素 的两个 TFT。
在一个刷新周期内的第一时刻, 栅线 Gatel和 Gate6打开, 则第 1行和 第 3行的像素都分别有一个 TFT被打开,且可通过各自独立的数据线写入电 压; 在一个刷新周期内的第二时刻, 栅线 Gate3和 Gate8打开, 则第 2行和 第 4行的像素都分别有一个 TFT被打开,且可通过各自独立的数据线写入电 压; 在一个刷新周期内的第三时刻, 栅线 Gate5和 Gate2打开, 则第 3行和 第 1行的像素都分别有一个 TFT被打开,且可通过各自独立的数据线写入电 压; 在一个刷新周期内的第四时刻, Gate7和 Gate4打开, 则第 4行和第 2 行的像素都分别有一个 TFT被打开, 且可通过各自独立的数据线写入电压。 由上可知, 每个 TFT的打开周期是相同的, 且在一个刷新周期的同一刷新时 间内, 同时打开两行像素的 TFT。
实施例 3
当使用不同的打开周期间隔驱动所述至少两个 TFT时,便可以实现更多 的灰度组合, 特别是结合上述对所述至少两个 TFT施加不同电压, 则可在对 像素提供一个高电压后, 很快再给一个低电压, 便可以在快速响应后进行更 精细地灰度控制。
同样以图 1所示每个像素含有两个可独立控制的 TFT, 且共有 4*4的 4 行像素, 一个刷新周期包括 4个刷新时刻为例进行说明。 每行像素有 2条栅 线, 则共有 8条 Gate线, 栅线 Gatel和 Gate2分别控制第一行像素的两个 TFT, 栅线 Gate3和 Gate4分别控制第二行像素的两个 TFT, 栅线 Gate5和 Gate6分别控制第三行像素的两个 TFT,栅线 Gate7和 Gate8分别控制第四行 像素的两个 TFT。
在一个刷新周期内的第一时刻, 栅线 Gatel和 Gate4打开, 则第 1行和 第 2行的像素都分别有一个 TFT被打开,且可通过各自独立的数据线写入电 压; 在一个刷新周期内的第二时刻, 栅线 Gate3和 Gate6打开, 则第 2行和 第 3行的像素都分别有一个 TFT被打开,且可通过各自独立的数据线写入电 压; 在一个刷新周期内的第三时刻, 栅线 Gate5和 Gate8打开, 则第 3行和 第 4行的像素都分别有一个 TFT被打开,且可通过各自独立的数据线写入电 压; 在一个刷新周期内的第四时刻, 栅线 Gate7和 Gate2打开, 则第 4行和 第 1行的像素都分别有一个 TFT被打开,且可通过各自独立的数据线写入电 压。 由上可知, 每个 TFT的打开周期是相同的, 但同一像素的两个 TFT打 开的时间间隔可以不同, 即周期间隔不同, 也可实现在一个刷新周期的同一 刷新时间内 , 同时打开两行像素的 TFT。
综上所述, 本发明的实施例公开了一种电子纸显示器件及其驱动方法。 根据本发明的实施例, 通过一个像素包括至少两个可独立控制的 TFT, 这两 个 TFT有独立的栅线和数据线,这样在传统电子纸显示器件刷新一次的周期 内, 可以至少刷新两次, 即所述电子纸显示器件中每个时刻同时至少有两行 TFT被打开。 而且上述的两次刷新可以配合多组不同电压及不同周期间隔。 这样既加快了刷新速度, 又可以降低对存储电容的要求。 而且更快的刷新速 度可以实现更快的灰度更新, 通过设置不同的刷新周期间隔, 提供更多的脉 冲组合方案, 从而实现更多、 更快的灰度显示。
以上所述仅是本发明的示范性实施方式, 而非用于限制本发明的保护范 围, 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1、 一种电子纸显示器件, 包括多个像素、 多条栅线和多条数据线, 每个 像素包括至少两个薄膜晶体管, 每个薄膜晶体管分别与相应的数据线和相应 的栅线电连接, 且在一个刷新周期内每个薄膜晶体管分别打开一次。
2、根据权利要求 1所述的电子纸显示器件, 其中,每个像素包括至少两 个子像素, 每个子像素包括至少两个薄膜晶体管, 每个薄膜晶体管分别与相 应的数据线和相应的栅线电连接, 且在一个刷新周期内每个薄膜晶体管分别 打开一次。
3、根据权利要求 1或 2所述的电子纸显示器件, 其中,还包括位于所述 多个像素上的树脂保护绝缘层。
4、 根据权利要求 1-3任一所述的电子纸显示器件, 其中, 所述至少两个 薄膜晶体管为单栅结构或双栅结构。
5、 根据权利要求 1-4任一所述的电子纸显示器件, 其中, 所述至少两个 薄膜晶体管为多晶硅或氧化物薄膜晶体管。
6、 根据权利要求 15任一所述的电子纸显示器件, 其中, 所述至少两个 薄膜晶体管为有机薄膜晶体管。
7、 一种电子纸显示器件的驱动方法, 包括:
驱动装置根据输入的视频数据信号, 获取电子纸显示器件中各像素的灰 度等级, 根据像素中所包含的薄膜晶体管的个数 N, 以及像素的灰度等级, 确定各像素中各薄膜晶体管的打开次序以及时间间隔以形成灰度显示方案; 向各像素的各薄膜晶体管所对应的栅线施加选通电压的同时, 按照所形 成的灰度显示方案向各像素的各薄膜晶体管所对应的数据线施加信号电压, 以分别驱动各像素呈现其灰度等级,
其中, N为自然数, 且^^≥2。
8、根据权利要求 7所述的电子纸显示器件, 其中, 所述按照所形成的灰 度显示方案向各像素的各薄膜晶体管所对应的数据线施加信号电压包括: 按照所形成的灰度显示方案向各像素的各薄膜晶体管所对应的数据线施 加多组不同设定大小的信号电压分别驱动各像素呈现其灰度等级。
9、根据权利要求 8所述的电子纸显示器件, 其中, 所述多组不同设定大 小的信号电压为 0V、 ±10V、 ±15V或 ±30V。
10、 根据权利要求 7-9任一所述的电子纸显示器件, 其中, 所述各薄膜 晶体管的打开时间间隔相同。
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US9311892B2 (en) 2016-04-12
US20160148555A1 (en) 2016-05-26

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