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WO2006000476A1 - Controlling electrochromic displays - Google Patents

Controlling electrochromic displays Download PDF

Info

Publication number
WO2006000476A1
WO2006000476A1 PCT/EP2005/051459 EP2005051459W WO2006000476A1 WO 2006000476 A1 WO2006000476 A1 WO 2006000476A1 EP 2005051459 W EP2005051459 W EP 2005051459W WO 2006000476 A1 WO2006000476 A1 WO 2006000476A1
Authority
WO
WIPO (PCT)
Prior art keywords
pixels
electrochromic
charge
display
electrochromic displays
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/EP2005/051459
Other languages
German (de)
French (fr)
Inventor
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
Siemens Corp
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
Publication of WO2006000476A1 publication Critical patent/WO2006000476A1/en
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
    • G09G3/38—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
    • G09G2310/04—Partial updating of the display screen

Definitions

  • the invention relates to a method for pixel-individual dyeing and / or decolorization in a display device constructed from pixels, in particular electrochromic pixels.
  • Electrochromic pixels are based on the chemical oxidation or reduction of electrochromic materials, which change their color depending on the chemical state.
  • the oxidation or reduction can be controlled by a current flow through the cell, wherein the color change is similar to the up relieving or discharging a capacitor.
  • the pixels are arranged in the form of a matrix.
  • the control of the pixels in the display device takes place, for example, by a passive matrix control, wherein the electrochromic material is located between two electrodes.
  • the individual pixels are driven in a so-called scan sequence in rows and columns.
  • a discoloration charge diagram of electrochromic cells or pixels is shown by way of illustration.
  • the self-explanatory diagram shows a curve K for the dependence of a color F of the pixel on the stored charge Q.
  • the electrochromic material is arranged in a passive matrix between a viewing electrode SE and a back electrode RE, the electrodes SE RE being the polarity the stored charge Q dependent color F have.
  • Currently used color combinations are yellow-blue, yellow-red or blue to white.
  • electrochromic cells are metastable, i. The state last reached is maintained over a relatively long period of time. Within the charge range of a cell, only a certain region NB can be used, which is determined by the zero line and a maximum value Qmax for the charge Q.
  • the invention has for its object to eliminate the above be ⁇ described problems.
  • a comparatively short reaction time is achieved by determining the control sequence of a display from the image content and thereby optimizing display subregions.
  • the scan order is determined individually for each image content.
  • certain sub-areas are controlled more frequently and thus the necessary apply faster charge amount.
  • the display reaction time for example in the region around an input cursor, is significantly shorter while the remainder of the display reacts more slowly. However, this can be neglected in bistable displays anyway, if the content of the rest of the display area does not change.
  • the "saved" time per line can be used to control any display area.

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

The invention relates to a method for coloring and/or decoloring individual pixels in a display device constituted of pixels, particularly of electrochromic pixels, during which the pixels to be modified are repeatedly controlled while deviating from a predetermined controlling sequence for the pixels.

Description

Beschreibungdescription

Ansteuerung elektrochromer DisplaysControl of electrochromic displays

Die Erfindung betrifft ein Verfahren zum pixelindividuellen Färben und / oder Entfärben bei einer aus Pixeln, insbesonde¬ re elektrochromen Pixeln aufgebauten Anzeigeeinrichtung.The invention relates to a method for pixel-individual dyeing and / or decolorization in a display device constructed from pixels, in particular electrochromic pixels.

Solche Pixel sind insbesondere durch sogenannte elektrochrome Pixel beziehungsweise Zellen realisiert. Elektrochrome Pixel basieren auf der chemischen Oxidation beziehungsweise Reduk¬ tion von elektrochromen Materialien, die je nach chemischem Zustand ihre Farbe ändern. Die Oxidation beziehungsweise Re¬ duktion kann durch einen Stromfluss durch die Zelle gesteuert werden, wobei die Farbänderung ähnlich dem Auf- beziehungs¬ weise Entladen eines Kondensators erfolgt.Such pixels are realized in particular by so-called electrochromic pixels or cells. Electrochromic pixels are based on the chemical oxidation or reduction of electrochromic materials, which change their color depending on the chemical state. The oxidation or reduction can be controlled by a current flow through the cell, wherein the color change is similar to the up relieving or discharging a capacitor.

Zur Realisierung einer Anzeigeeinrichtung sind die Pixel mat- rixförmig angeordnet. Die Ansteuerung der Pixel in der Anzei- geeinrichtung erfolgt beispielsweise durch eine Passivmatrix- Ansteuerung, wobei sich das elektrochrome Material zwischen zwei Elektroden befindet. Bei der (Passivmatrix-) Ansteuerung wird in einer sogenannten Scan-Reihenfolge zeilen- und spal¬ tenweise die einzelnen Pixel angesteuert.To realize a display device, the pixels are arranged in the form of a matrix. The control of the pixels in the display device takes place, for example, by a passive matrix control, wherein the electrochromic material is located between two electrodes. In the (passive matrix) control, the individual pixels are driven in a so-called scan sequence in rows and columns.

Zum Umschalten wird auf die einzelnen Pixel Ladung aufge¬ bracht, wobei sich aufgrund von Materialeigenschaften, wie beispielsweise Kapazität, die Pixel nicht beliebig schnell umschalten lassen. Oft wird die notwendige Ladungsmenge auch durch mehrere schnelle Ansteuerzyklen aufgebracht, die nach¬ einander alle Zeilen des Displays einzeln ansteuert. Damit sind Teile des Bildinhaltes schon früher sichtbar, allerdings mit eingeschränktem Kontrast. Dennoch ist die Reaktionszeit eines solchen Displays viel zu groß, um interaktive Benutzer— Oberflächen abzubilden und um auf Benutzereingaben angemessen schnell zu reagieren. Eine Ansteuerung mit einer Aktivmatrix hat Kostennachteile.For switching, charge is applied to the individual pixels, wherein due to material properties, such as capacitance, the pixels can not be switched over at any desired speed. Often, the required amount of charge is also applied by a plurality of fast drive cycles, which nach¬ each actuates all lines of the display individually. Thus, parts of the image content are visible earlier, but with limited contrast. However, the response time of such a display is far too large to map interactive user interfaces and to react reasonably quickly to user input. Activation with an active matrix has cost disadvantages.

In der einzigen Figur ist zur Erläuterung ein Verfärbungs- Ladungsdiagramm elektrochromer Zellen oder Pixel dargestellt. Das selbsterklärende Diagramm zeigt eine Kenlinie K für die Abhängigkeit einer Farbe F des Pixels von der gespeicherten Ladung Q. Hierbei ist das elektrochrome Material in einer Passivmatrix zwischen einer Sichtelektrode SE und einer Rück¬ elektrode RE angeordnet, wobei die Elektroden SE RE die von der Polarität der gespeicherten Ladung Q abhängige Farbe F aufweisen. Momentan gebräuchliche Farbkombinationen sind gelb—blau, gelb-rot oder blau zu weiss.In the single figure, a discoloration charge diagram of electrochromic cells or pixels is shown by way of illustration. The self-explanatory diagram shows a curve K for the dependence of a color F of the pixel on the stored charge Q. In this case, the electrochromic material is arranged in a passive matrix between a viewing electrode SE and a back electrode RE, the electrodes SE RE being the polarity the stored charge Q dependent color F have. Currently used color combinations are yellow-blue, yellow-red or blue to white.

Diese elektrochromen Zellen sind metastabil d.h. der zuletzt erreichte Zustand wird über einen längeren Zeitraum beibehal¬ ten. Innerhalb des Ladungsbereiches einer Zelle ist nur ein bestimmter Bereich NB nutzbar, der durch die Nulllinie und einen Maximalwert Qmax für die Ladung Q bestimmt ist.These electrochromic cells are metastable, i. The state last reached is maintained over a relatively long period of time. Within the charge range of a cell, only a certain region NB can be used, which is determined by the zero line and a maximum value Qmax for the charge Q.

Der Erfindung liegt die Aufgabe zugrunde die vorstehend be¬ schriebenen Probleme zu beseitigen.The invention has for its object to eliminate the above be¬ described problems.

Diese Aufgabe wird erfindungsgemäss durch die im Patentan¬ spruch 1 angegebenen Merkmale gelöst.This object is achieved according to the invention by the features specified in patent claim 1.

Bei dem erfindungsgemäßen Verfahren wird durch die Bestimmung der Ansteuerungsabfolge eines Displays aus dem Bildinhalt und dadurch einer Optimierung von Display-Teilbereichen eine ver¬ gleichsweise kurze Reaktionszeit erreicht.In the method according to the invention, a comparatively short reaction time is achieved by determining the control sequence of a display from the image content and thereby optimizing display subregions.

Im folgenden wird die Erfindung anhand eines Ausführungsbei— Spieles näher beschrieben.In the following the invention will be described with reference to a Ausführungsbei- game.

Erfindungsgemäß wird von einer festgelegten Scan—Reihenfolge abgewichen. Dazu wird die Scan-Reihenfolge individuell für jeden Bildinhalt festgelegt. Hierzu werden bestimmte Teilbe¬ reiche häufiger angesteuert und somit lässt sich die notwen- dige Ladungsmenge schneller aufbringen. Bei dem erfindungsge¬ mäßen Verfahren ist die Display-Reaktionszeit, beispielsweise im Bereich um einen Eingabecursor, deutlich kürzer während der Rest des Displays langsamer reagiert. Dies kann jedoch bei bistabilen Displays ohnehin vernachlässigt werden, wenn sich der Inhalt des übrigen Display-Bereiches nicht ändert.According to the invention, deviations from a defined scan order. For this purpose, the scan order is determined individually for each image content. For this purpose, certain sub-areas are controlled more frequently and thus the necessary apply faster charge amount. In the method according to the invention, the display reaction time, for example in the region around an input cursor, is significantly shorter while the remainder of the display reacts more slowly. However, this can be neglected in bistable displays anyway, if the content of the rest of the display area does not change.

Nachdem die einzelnen Pixel geladen beziehungsweise entladen sind, ist zum Erhalten des Ladungszustandes eine deutlich kürzere aktive Ansteuerzeit notwendig. Zweckmäßig ist es auch dann ein festes zeitliches Raster über die einzelnen Zeilen beizubehalten und die aktive Ansteuerzeit innerhalb der Zei¬ lenzeit zu verkürzen. Die "ersparte" Zeit pro Zeile kann für die Ansteuerung beliebiger Displaybereiche genutzt werden. After the individual pixels are charged or discharged, a much shorter active drive time is required to obtain the charge state. It is also expedient to maintain a fixed time grid over the individual lines and to shorten the active activation time within the time zone. The "saved" time per line can be used to control any display area.

Claims

Patentansprüche claims 1. Verfahren zum pixelindividuellen Färben und / oder Entfär¬ ben bei einer aus Pixeln, insbesondere elektrochromen Pixeln aufgebauten Anzeigeeinrichtung, bei dem abweichend von einer fest vorgegebenen Ansteuer- Abfolge für die Pixel die zu ändernden Pixel öfters angesteu¬ ert werden.1. A method for pixel-individual dyeing and / or decolorizing ben in a built-up of pixels, in particular electrochromic pixels display device in which deviating from a fixed drive sequence for the pixels to be changed pixels are often angesteu¬ ert. 2 Verfahren gemäss Anspruch 1, bei dem insbesondere der zu ändernde Bildinhalt die Ansteuer- Abfolge bestimmt. 2 Method according to claim 1, wherein in particular the image content to be changed determines the drive sequence.
PCT/EP2005/051459 2004-06-23 2005-03-31 Controlling electrochromic displays Ceased WO2006000476A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04014758.9 2004-06-23
EP04014758 2004-06-23

Publications (1)

Publication Number Publication Date
WO2006000476A1 true WO2006000476A1 (en) 2006-01-05

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644344A (en) * 1983-12-29 1987-02-17 International Business Machines Corporation Electrochromic matrix display
US5408247A (en) * 1989-12-19 1995-04-18 Canon Kabushiki Kaisha Information processing apparatus and display system with simultaneous partial rewriting scanning capability
US20030122773A1 (en) * 2001-12-18 2003-07-03 Hajime Washio Display device and driving method thereof
US20030156083A1 (en) * 2002-02-19 2003-08-21 Willis Thomas E. Sparse refresh double-buffering

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644344A (en) * 1983-12-29 1987-02-17 International Business Machines Corporation Electrochromic matrix display
US5408247A (en) * 1989-12-19 1995-04-18 Canon Kabushiki Kaisha Information processing apparatus and display system with simultaneous partial rewriting scanning capability
US20030122773A1 (en) * 2001-12-18 2003-07-03 Hajime Washio Display device and driving method thereof
US20030156083A1 (en) * 2002-02-19 2003-08-21 Willis Thomas E. Sparse refresh double-buffering

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MŸRTEN O M EDWARDS ET AL: "P-92: Electrochromic Passive-Matrix Displays", SID DIGEST, vol. XXXIV, 1 May 2003 (2003-05-01), pages 570 - 571, XP007008530 *

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