[go: up one dir, main page]

WO2006006121A1 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

Info

Publication number
WO2006006121A1
WO2006006121A1 PCT/IB2005/052220 IB2005052220W WO2006006121A1 WO 2006006121 A1 WO2006006121 A1 WO 2006006121A1 IB 2005052220 W IB2005052220 W IB 2005052220W WO 2006006121 A1 WO2006006121 A1 WO 2006006121A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
driver
electrode
common point
voltages
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2005/052220
Other languages
English (en)
Inventor
Theodorus J. P. Van Den Biggelaar
Roy Van Dijk
Hubertus W. J. J. Van De Laar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of WO2006006121A1 publication Critical patent/WO2006006121A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0469—Details of the physics of pixel operation
    • G09G2300/0473—Use of light emitting or modulating elements having two or more stable states when no power is applied
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/06—Passive matrix structure, i.e. with direct application of both column and row voltages to the light emitting or modulating elements, other than LCD or OLED
    • 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
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0267—Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
    • 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
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking

Definitions

  • the invention relates to a display device having picture elements, each of the picture elements comprising on a substrate, a first electrode, a dielectric layer between said first electrode and a second electrode, the second electrode being movable in response to an electric field between a first position corresponding to an edge region of the picture element and a second position in which the second electrode at least partly covers the further surface region of the picture element.
  • a picture element it may either be a full picture element or a sub-pixel such as the red, green or blue sub-pixel in a picture element.
  • a dielectric layer a layer is meant having such a high resistance that the mobility of the second electrode to move between the two positions, which positions, in the case of a display device, are related to electro-optical states of the display device (fully transmissive, fully reflecting or fully opaque (back)) is not influenced.
  • the invention also relates to a display driver for driving such a display device.
  • the display device can be used, dependent on the pixel size in micro-projector applications, large screen applications such as wallpaper but also in window applications.
  • a display device of the kind mentioned above is known from e.g. USP
  • the second electrode here is rollable in response to an electric field between a first position in which the rolled electrode is present at the edge region of the picture element and a second position in which the second electrode is unrolled and covers the further surface region of the picture element.
  • bistability the difference between the voltages for switching on and off respectively
  • display pixels that are switched on will stay on and all pixel that are switched off stay switched off unless addressed a second time.
  • display drivers providing voltages in the order of 10 V to 200 V, this can only be obtained with high voltage drivers leading to high driver costs.
  • a display device has a display driver for selecting a set of picture elements by supplying patterns of selection voltages which display driver comprises two switches in series between a first voltage and a second voltage at the common point of which a part of the voltages of the patterns of selection voltages is supplied by the driver, a third voltage being applicable to said common point for providing a further selection voltage.
  • a high- ohmic current path or even an open path is introduced during non-selection, leading to substantially no dissipation.
  • the row is connected to the hold voltage through a resistor. Since the display element is capacitive there is no power dissipation. The hold voltage keeps the pixel elements in its bistable area and the pixels will remain in their states.
  • the further switch is provided between the common point for providing a further selection voltage and the third voltage.
  • the driver now does not need external resistors.
  • a further device according to the invention has a resistor provided between the common point for providing a further selection voltage and the third voltage, the driver comprising means to bring the two switches in series simultaneously in an open state.
  • This device can easily be realized by modifying existing, commercially available, two-level drivers such as PDP - drivers into three-level drivers.
  • a driver according to the invention can also be used in other (high-) voltage displays such as foil-displays and other mainly capacitive display elements.
  • Figure 1 schematically shows a part of a device according to the invention
  • Figure 2 shows a plan view of the part of the device of Figure 1
  • Figure 3 shows transmission voltage characteristics of the device of Figure 1
  • Figure 4 schematically shows a matrix of display elements
  • Figure 5 show driving forms for the device of Figure 4
  • Figure 6 shows an embodiment of a device according to the invention
  • Figure 7 shows driving forms for the device of Figure 6
  • Figure 8 shows a further embodiment of a device according to the invention
  • Figure 9 shows driving forms for the device of Figure 8 and Figure 10 shows a possible realization of a driver according to the invention.
  • the Figures are diagrammatic and not to scale; corresponding components are generally denoted by the same reference numerals.
  • Figures 1 and 2 schematically show a part of a device 1 according to the invention, in this particular embodiment a transparent display device.
  • a transparent substrate 2 is covered with transparent first electrodes 3 e.g. ITO -electrodes.
  • the electrodes 3 are covered with a thin dielectric layer 4.
  • the thin dielectric layer 4 electrically isolates the electrodes 3 (e.g. parts of column electrodes) from the reliable electrode parts 5 (e.g. parts of column electrodes).
  • Figure 1 shows three (sub) picture elements, two of which are in an open, transparent state (reliable electrode 5, 6 rolled up to a first position), the other one being in a closed, opaque (black) state (reliable electrode 5, 6 unrolled to a second position).
  • the foil 6 is glued to the dielectric layer 4 on one side part 7 of every picture element.
  • the reliable electrode 5, 6 are switchable between a transmissive (open) state and an opaque (closed) state, e.g. by choosing aluminum for the electrode parts 5.
  • the device 1 further comprises e.g. driving means and for example a backlighting system.
  • the foil 6 or the Tollable electrode 5, 6 may be covered with a white layer to reflect the ambient light, while the substrate now is opaque by covering it with an opaque layer at one of its sides.
  • a further possibility is making the substrate 2 reflective and the reliable electrode 5, 6 black.
  • the elastic force is the force present in the Tollable electrode 5, 6 and is the result of e.g. shrinkage during manufacturing and this force is directed at rolling up the rollable electrode 5, 6 of a (sub) picture element or (sub) pixel.
  • the electrostatic force is the attractive force between the conductive electrode part 5 and the (ITO) on the substrate by applying a voltage.
  • the "van der Waals” force is the force between the (sub) pixel foil 6 and the substrate 2.
  • This force depends on the distance between the two media, the roughness of the media and the material properties. The smaller the distance is, the larger the “van der Waals" force is.
  • the electrostatic force depends strongly on the distance, the surface area, dielectric constant of the materials and the voltage difference between the foil and the substrate. The gravitational force acts upon the rolled up electrode 5, 6 which also depends on the orientation of this foil. It is very thin and has therefore a very low mass, so it is probably negligible.
  • the elastic force is directed at rolling up the rollable electrode 5, 6 , while the electrostatic force and the "van der Waals” force are directed at keeping the rollable electrode 5, 6 closed.
  • the elastic force must be larger than the "van der Waals” force, since the picture element (pixel) in the device 1 is open if no or little electrostatic force is present.
  • the "van der Waals” force and the electrostatic force keep it closed, whereas the elastic force wants to open it.
  • the rollable electrode 5, 6 If no voltage is applied the rollable electrode 5, 6 is in a rolled up state, giving a transparent picture element in transmissive mode or a dark pixel in reflective mode.
  • V 2 in matrix-display devices the difference between the column voltages and the row voltages, the electrostatic forces rolls down the rollable electrode 5, 6 on to the substrate 2, covering the pixel area and creating a dark pixel in transmissive mode or a white pixel in reflective mode.
  • FIG. 3 shows the transmission T of the device of Figure 1 as a function of the voltage V.
  • a first threshold voltage Vi (which may be presented as a voltage difference between a row 11 and column 12 in a matrix display 1, see Figure 4) a picture element is opened (the rollable electrode 5, 6 rolls up), if it was not open already.
  • V 2 At the second threshold voltage, V 2 a pixel is closed (the rollable electrode 5, 6 becomes flattened), if it was not already closed.
  • the polarity of the voltages is not important, only the absolute value is important. In between these values a pixel that was open, will remain open and a pixel that was closed will remain closed.
  • the threshold voltages are determined by the material parameters, i.e.
  • the (matrix) display 1 of Figure 4 having n rows and m columns is driven by a (schematically shown) row driver 13 and column driver 14, having picture element at the crossings of rows and columns.
  • Figure 5 schematically shows driving forms for the device of Figure 4 during four successive row times selecting rows j, j+1, j+2 and j+3.
  • the voltage of such a row is for example OV, indicated in Figure 5 for row j+3 as Level 3.
  • the column voltages must be between
  • a row that is being addressed is first brought to a low voltage (for instance a negative voltage, indicated in Figure 5 for row j+3 as Level 1), so that the voltage difference between the columns and the selected row is larger than
  • the rows of the unselected rows are at OV (Level 3). This means that the column voltages must be larger than
  • the row is brought at a higher voltage, indicated in Figure 5 for row j+3 as Level 2.
  • the column voltages are switched; to a(n absolute) voltage above I Vl I for pixels that must be opened, and to a(n absolute) voltage below
  • Vl the voltage difference between the selected row and column voltage
  • the voltage difference between the selected row and column voltage
  • is larger than
  • the column voltages are switched to a(n absolute) voltage above
  • is larger than
  • is larger than
  • the choice either to close all pixels first of an addressed row or first open all pixels in the selected row can depend on whether a panel is driven in reflective or transmissive mode.
  • all the voltages can also be driven to their opposite values at regular or irregular intervals, for instance every second frame.
  • Levels 1,2,3 can be obtained by the embodiment of Figure 6, using three switches 15
  • Switches 1, 2 and 3 The output is switched between VCCl, VCC2 and VCC3 as shown in the timing diagram of Figure 7. Every time only one switch is turned on. When all three the switches are turned off the output is placed in a high-impedance state, see Figure 7.
  • FIG 8 shows another embodiment in which an external resistor 16 is added to a configuration of two switches (Switch circuit) and is applied with an external power signal (VCC3).
  • VCC3 external power signal
  • the switches 1 and 2 offer the possibility of switching the output between VCCl and VCC2; when both switches are turned off the output is equal to VCC3 .
  • a possible timing diagram to realize this is shown in Figure 9. Only one switch is turned on at one time. The resistor only dissipates during the time that one of the switches is activated. This is only done for one row at a time (during row selection).
  • FIG. 10 shows a schematical realization a part of a driver using this principle.
  • Information 20 to be displayed is stored into a latch 22 via a shift register 21.
  • the switches of Figure 8 have been realized as FETs 26 and 27, which are enabled by logical NAND - circuits 24 and 25 respectively. For selecting a row first FET circuit 26 is activated to switch the row to VCCl during a first phase. Then the second FET circuit 27 is activated to switch the row to VCC2 during the next phase. Then the FET circuits are deactivated via signal HZ and the high ohmic external resistor 16 pulls the row to VDD3.
  • the invention is not restricted to the embodiments shown.
  • the reliable electrodes 5, 6 have two sides.
  • the top side is reflective (white, red, green or blue).
  • the bottom side is black.
  • a driver according to the invention can also be used in other high-voltage displays such as foil-displays.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

Cette invention concerne un dispositif d'affichage reposant sur le principe de l'enroulement, qui comporte un circuit d'attaque pour la sélection d'un jeu d'éléments d'image au moyens de modes de tensions de sélection, lequel circuit d'attaque comprend deux commutateurs (15, 26, 27) en série entre une première tension (VCC1) et une seconde tension (VCC2) au point commun desquels une partie des tensions de sélection est fournie par le circuit pilote, une troisième tension (VCC3) étant applicable audit point commun via un commutateur supplémentaire (15) ou d'une résistance (16) pour la fourniture d'une autre tension de sélection.
PCT/IB2005/052220 2004-07-08 2005-07-04 Dispositif d'affichage Ceased WO2006006121A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04103250.9 2004-07-08
EP04103250 2004-07-08

Publications (1)

Publication Number Publication Date
WO2006006121A1 true WO2006006121A1 (fr) 2006-01-19

Family

ID=35414574

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/052220 Ceased WO2006006121A1 (fr) 2004-07-08 2005-07-04 Dispositif d'affichage

Country Status (1)

Country Link
WO (1) WO2006006121A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004007399A1 (de) 2004-02-16 2005-09-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Polymersystem mit definiert einstellbarer Ladungsträgerbeweglichkeit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6317108B1 (en) * 1992-05-22 2001-11-13 Display Science, Inc. Electrostatic video display drive circuitry and displays incorporating same
US20020054424A1 (en) * 1994-05-05 2002-05-09 Etalon, Inc. Photonic mems and structures

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6317108B1 (en) * 1992-05-22 2001-11-13 Display Science, Inc. Electrostatic video display drive circuitry and displays incorporating same
US20020054424A1 (en) * 1994-05-05 2002-05-09 Etalon, Inc. Photonic mems and structures

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004007399A1 (de) 2004-02-16 2005-09-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Polymersystem mit definiert einstellbarer Ladungsträgerbeweglichkeit

Similar Documents

Publication Publication Date Title
KR100641920B1 (ko) 쌍안정 페이퍼 화이트(ｐａｐｅｒ ｗｈｉｔｅ) 디렉트-뷰디스플레이
US8139050B2 (en) Addressing schemes for electronic displays
US8878769B2 (en) Electrophoretic display apparatus and method of driving the same
KR101534191B1 (ko) 디스플레이 장치 및 그 구동 방법
EP1340216A2 (fr) Schemas d'adressage destines a des ecrans electroniques
JPWO2000008625A1 (ja) 電気光学装置及び電子機器
KR20130045258A (ko) 전기광학 디스플레이의 구동 방법
KR20060032631A (ko) 향상된 그레이스케일 정확성을 가진 쌍안정 디스플레이구동방법
US20060291122A1 (en) Method of compensating temperature dependence of driving schemes for electrophoretic displays
US11450286B2 (en) Apparatus and methods for driving displays
US11990101B2 (en) Methods and circuits for diode-based display backplanes and electronic displays
WO2008001288A1 (fr) Dispositifs d'affichage à électrophorèse
WO2007135594A1 (fr) Dispositifs électrophorétiques de visualisation
US9007298B2 (en) Display control mode
WO2017049020A1 (fr) Appareil et procédés pour piloter des dispositifs d'affichage
US20060267890A1 (en) Display device, display method, liquid crytal drive circuit, and liquid crystal drive method
WO2006006121A1 (fr) Dispositif d'affichage
CN102456314A (zh) 显示装置及具有显示装置的电子设备
KR101508089B1 (ko) 액정표시장치 및 그 구동방법
US5032829A (en) Thin film el display device
JP2009104050A (ja) 液晶表示装置
WO2006008687A1 (fr) Dispositif d'affichage
JP5478395B2 (ja) 電気泳動表示装置及びその駆動方法
KR100319960B1 (ko) 서브전극구조를가지는강유전체액정디스플레이에서아날로그회색색표어드레싱
US20080158123A1 (en) Active Matrix for a Liquid Crystal Display Device

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

122 Ep: pct application non-entry in european phase