EP1577875A1 - Commande de dispositif d'affichage electrochromique - Google Patents

Commande de dispositif d'affichage electrochromique Download PDF

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Publication number
EP1577875A1
EP1577875A1 EP04015547A EP04015547A EP1577875A1 EP 1577875 A1 EP1577875 A1 EP 1577875A1 EP 04015547 A EP04015547 A EP 04015547A EP 04015547 A EP04015547 A EP 04015547A EP 1577875 A1 EP1577875 A1 EP 1577875A1
Authority
EP
European Patent Office
Prior art keywords
voltage
pixels
pixel
electrochromic
activation
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.)
Withdrawn
Application number
EP04015547A
Other languages
German (de)
English (en)
Inventor
Ralf Carle
Marco Werner
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.)
Siemens AG
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP04015547A priority Critical patent/EP1577875A1/fr
Priority to PCT/EP2004/053353 priority patent/WO2005098812A1/fr
Publication of EP1577875A1 publication Critical patent/EP1577875A1/fr
Withdrawn legal-status Critical Current

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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
    • G09G3/38—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 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • 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
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0254—Control of polarity reversal in general, other than for liquid crystal 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 method for pixel-individual Dyeing and / or discoloring in one of electrochromic pixels constructed display device.
  • Such electrochromic pixels or cells are based on the chemical oxidation or reduction of electrochromic materials, depending on their chemical state change their color.
  • the oxidation or reduction can be controlled by a current flow through the cell, the color change being similar to loading or unloading a capacitor takes place.
  • the control of the pixels in the display device takes place for example, by a passive matrix drive, wherein the electrochromic material is between two electrodes.
  • the (passive matrix) control loses the electrochromic Material in the times when the pixels are not be controlled, something in the previously achieved discoloration and it thus lengthens the time until a desired Degree of discoloration is achieved.
  • FIG. 1 is for explanation a discoloration charge diagram electrochromic cells or pixels.
  • the self-explanatory diagram shows a k-line K for the Dependence of a color F of the pixel on the stored Charge Q.
  • the electrochromic material is in one Passive matrix between a viewing electrode SE and a return electrode RE arranged, wherein the electrodes SE RE the of the polarity of the stored charge Q dependent color F exhibit.
  • Currently used color combinations are yellow-blue, yellow-red or blue to white.
  • electrochromic cells are metastable, i. the last one reached state is maintained over a longer period.
  • Within the charge range of a cell is only one certain area NB usable by the zero line and a maximum value Qmax is determined for the charge Q.
  • the invention is based on the object described above To eliminate problems.
  • the inventive method allows a considerable faster image rendering because the pixels are not from scratch to be loaded.
  • the charge state of each pixel or Image pixels are no longer monitored. from that result in lower processing power and a lower one Memory requirements. Next, there is no zero drift anymore instead of.
  • a discoloration / voltage characteristic typical of electrochromic cells is shown in FIG.
  • a high Contrast range can be used as a limitation of the working characteristic or a workspace practically the zero point on one side and a voltage Umax on the other Page to be selected. By the charge quantity differences between these two values becomes a high metastability reached.
  • this is analogous to the voltage range be understood on the working characteristic, the between a state of the pixel with displayed content, respectively Color and a condition without content lies.
  • Voltage Ue is just below an activation voltage Uf, by the materials used and chemical potentials Uchem (see FIG. 3) of an electrochromic Cell is dependent.
  • the usable contrast range it reduces slightly and the necessary amount of charge Switching significantly reduces.
  • FIG. 3 is a simplified electrical Equivalent circuit diagram indicated. It is assumed that the pixel is approximated by two antiparallel diodes be described with a downstream capacitor Cchem can. At the unspecified diodes falls the Activation voltage Uf (see also Figure 2) from, and on the Capacitor Cchem a charging voltage Uchem.
  • Pixel may be a display or a display device being constructed.
  • the drive voltage must be or driving time for a new image the current Consider image information.
  • the control writes per Pixel thereby the difference of contents to be displayed and straight displayed content or stored cargo.
  • the pixels or cells with a bias voltage Ue corresponds to the voltage value Ue in FIG 2) with a value just below the activation voltage Uf permanently driven.
  • the bias voltage Ue has a negative sign relative to the charge contained in the cell.
  • the decolorization or deletion of a pixel happens by deprivation of charge. This is one in the cell stored charge Q opposite voltage applied. Again, this must be stored in the pixel before discoloring Charge Q be known.
  • a crosstalk between the pixels, the temperature, the materials used and their aging has a dynamic influence on the amount of charge.
  • the determination of the amount of charge per pixel is very complex. Inaccuracies are expressed in a long-term Shifting the discoloration area per pixel (cell) and in inhomogeneities.
  • a DC or erase voltage Ue used a DC or erase voltage Ue.
  • the value of the erase voltage Ue is just below the activation voltage Uf (see Figures 2 and 3) whereby approximately compensates the forward voltage of the diodes becomes.
  • An uncharged pixel will not be affected by this d. H. no electricity is flowing.
  • the activation voltage Uf is exceeded and a Current for erasing the pixel flows.
  • the effective discharge voltage is due to the voltage range between -Ue and - Given Ue + Uf. This range is shown in FIG. 4 (and also in FIG Figures 5 and 6) hatched.
  • the erase voltage periodically reversed as in Figure 5 using a Discharge curve for over-erased pixels shown. hereby can also be called over-erased image pixels in a defined, discharged state.
  • the speed The polarity reversal can vary depending on the material Have values.
  • Umpolungsvorgang can also be a low-frequency AC voltage can be used, as in Figure 6 based on a Discharge curve with AC voltage shown. In this case you can delete all pixels of a display with the same signal, regardless of their original state of charge.
  • the active erase pulse with a voltage greater than the activation voltage Uf causes a very fast, but inaccurate Clear. After that, all discharged pixels can go over one longer period of time with the periodically reversed DC voltage Ue (with a value just below the activation voltage Uf) - continue to be deleted. This can be, for example during subsequent refresh cycles.

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  • 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)
EP04015547A 2004-03-17 2004-07-01 Commande de dispositif d'affichage electrochromique Withdrawn EP1577875A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04015547A EP1577875A1 (fr) 2004-03-17 2004-07-01 Commande de dispositif d'affichage electrochromique
PCT/EP2004/053353 WO2005098812A1 (fr) 2004-03-17 2004-12-08 Commande d'affichages electrochromes

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04006434 2004-03-17
EP04006434 2004-03-17
EP04015547A EP1577875A1 (fr) 2004-03-17 2004-07-01 Commande de dispositif d'affichage electrochromique

Publications (1)

Publication Number Publication Date
EP1577875A1 true EP1577875A1 (fr) 2005-09-21

Family

ID=34839789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04015547A Withdrawn EP1577875A1 (fr) 2004-03-17 2004-07-01 Commande de dispositif d'affichage electrochromique

Country Status (2)

Country Link
EP (1) EP1577875A1 (fr)
WO (1) WO2005098812A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006017579B3 (de) * 2006-04-13 2007-05-24 Infineon Technologies Ag Ansteuerschaltung für ein Zündelement eines Sicherheitssystems

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4175836A (en) * 1976-08-31 1979-11-27 Xerox Corporation Method and apparatus for forming visible images

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4175836A (en) * 1976-08-31 1979-11-27 Xerox Corporation Method and apparatus for forming visible images

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006017579B3 (de) * 2006-04-13 2007-05-24 Infineon Technologies Ag Ansteuerschaltung für ein Zündelement eines Sicherheitssystems

Also Published As

Publication number Publication date
WO2005098812A1 (fr) 2005-10-20

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