WO2012165316A1 - Display device - Google Patents

Display device Download PDF

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Publication number
WO2012165316A1
WO2012165316A1 PCT/JP2012/063442 JP2012063442W WO2012165316A1 WO 2012165316 A1 WO2012165316 A1 WO 2012165316A1 JP 2012063442 W JP2012063442 W JP 2012063442W WO 2012165316 A1 WO2012165316 A1 WO 2012165316A1
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WO
WIPO (PCT)
Prior art keywords
pixels
display device
charge
display
storage unit
Prior art date
Application number
PCT/JP2012/063442
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French (fr)
Japanese (ja)
Inventor
眞子　隆志
裕希 百川
Original Assignee
日本電気株式会社
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Publication date
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Publication of WO2012165316A1 publication Critical patent/WO2012165316A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on an electrochromic effect
    • G02F1/163—Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor
    • 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
    • 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
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active 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
    • 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
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/023—Power management, e.g. power saving using energy recovery or conservation

Definitions

  • the present invention relates to a display device.
  • Patent Documents 1 and 2 disclose display devices using EC and electrodes thereof. These display devices are expected to be applied to electronic paper and the like because of the non-volatile display and gentleness to the eyes, which are difficult to realize with a liquid crystal display (LCD).
  • LCD liquid crystal display
  • Display devices using an electrochemical reaction such as EC or ED have “features that require less power to maintain the display” common to all non-volatile electronic papers. The drive with the lowest voltage is possible.
  • Patent Document 6 in a display device using EC, the transfer of electric charge is performed by opening and closing a switch that connects between a portion where the color disappears (cell) and a portion where the color is reached (cell) when rewriting the display. Techniques to do are disclosed.
  • Patent Document 6 it is possible to partially reduce the power for display rewriting.
  • an object of the present invention is to provide a display device that can greatly reduce power consumption.
  • the display device of the present invention comprises: A display unit including a plurality of pixels including a material through which charges come and go; A power storage unit that charges and discharges electric charges emitted from at least one of the pixels; First electrical wiring connecting the display unit and the power storage unit; A second electrical wiring connecting the display unit and the power storage unit via a booster circuit; And a switch unit for selecting one of the first electric wiring and the second electric wiring.
  • the display device of the present invention is A display unit including a plurality of pixels including a material through which charges come and go; A power storage unit that charges and discharges electric charges emitted from at least one of the pixels; Charge / discharge means for transferring charge between the display unit and the power storage unit, The charging / discharging means When reducing the charge of at least one of the pixels, the charge discharged from the at least one of the pixels is charged into the power storage unit, When the charge of at least one of the pixels is increased, the charge charged in the power storage unit is discharged.
  • a display device capable of significantly reducing power consumption can be provided.
  • FIG. 1 is a schematic diagram for explaining the principle of the display device of the present invention.
  • FIG. 2 is a diagram showing an example of an electric circuit in the display device of the present invention.
  • FIG. 3 is a schematic cross-sectional view showing an example of the overall configuration of the display device of the present invention (electrochromic (hereinafter, referred to as “EC” similarly to electrochromism) display device).
  • EC electrochromic
  • 4 is a cross-sectional view showing an example of an EC cell in the EC display device shown in FIG.
  • FIG. 5 is a diagram showing an example of a cell selection mechanism in the EC display device shown in FIG.
  • the charge accumulated in the pixel that is to be released in display rewriting is stored in the power storage unit and reused for drawing a pixel that is newly charged in display rewriting.
  • pixel is synonymous with cell, display cell, and pixel.
  • each pixel of a display device using an electrochemical reaction such as EC or ED can be regarded as a fine secondary battery.
  • portions (pixels) having different colors have different charge accumulation states, and each corresponds to a charged state or a discharged state of the secondary battery. Which of the colored part and the non-colored part corresponds to the charged state depends on the combination of the materials used.
  • charge state in order to distinguish pixels (cells) having different colors, they are simply referred to as “charged state” and “discharged state”.
  • charge injection power supply
  • the released charge can be stored in the power storage unit and reused for driving the display device such as redrawing, so that significant power saving can be realized.
  • FIG. 1 schematically shows the display device of the present invention.
  • the number of pixels 11 included in the display unit 10 is nine.
  • the display unit 10 is a display device. The number of pixels 11 according to the resolution is provided.
  • the pixel 11 may be an EC cell including an EC material as a material through which electric charges enter and exit.
  • the display device of the present invention may be an ED display device in which the display unit 10 is an ED system.
  • the EC material for example, tungsten oxide (WO 3 or the like), a complex compound containing hexacyano iron typified by Prussian blue, an organic electrochromic material such as viologen, or the like can be used.
  • FIG. 2 shows an example of an electric circuit in the display device of the present invention.
  • this electric circuit includes a power storage unit (secondary battery) 22, a booster circuit 23, a switch unit (switching switch) 24, and an external power supply 25 as main components.
  • the external power supply 25 is an optional component and may not be included, but is preferably included.
  • the input terminal of the booster circuit 23 is preferably connected to the cell array 20, and the output terminal of the booster circuit 23 is preferably connected to the secondary battery 22. Furthermore, the power supply to the cell array 20 by the external power supply 25 can be selected by setting the changeover switch 24 to the V terminal side.
  • the display device of the present invention may have a configuration in which the cell array 20 and the secondary battery 22 are connected by charging / discharging means.
  • the charging / discharging means may be a simple electric wiring, but preferably includes a switch unit that allows the charging and discharging of the secondary battery 22 to be selected, and includes the changeover switch 24, the first electric wiring, and the first electric wiring. It is more preferable that two electrical wirings are included.
  • a pixel (cell) in a charged state that should be discharged in display rewriting is connected to the secondary battery 22.
  • the changeover switch 24 is set to the D terminal side, and the charged pixel (cell) is passed through the booster circuit 23. 2 is connected to the secondary battery 22 by electrical wiring.
  • the changeover switch 24 is set to the C terminal side, and the pixel (cell) in the charged state is secondary by the first electric wiring. Connect to battery 22. In this manner, the charge discharged from the charged pixel (cell) is accumulated in the secondary battery 22.
  • a discharge state pixel (cell) to be newly charged in display rewriting is connected to the secondary battery 22.
  • the changeover switch 24 is set to the C terminal side, and the discharge state pixel (cell) is set to 2 by the first electric wiring.
  • the secondary battery 22 is connected.
  • the changeover switch 24 is set to the D terminal side, and the pixel (cell) in the discharged state is connected to the second through the booster circuit 23.
  • the secondary battery 22 is connected by electrical wiring. In this case, in FIG. 2, the input terminal of the booster circuit 23 is connected to the secondary battery 22, and the output terminal of the booster circuit 23 is connected to the cell array 20. In this way, the electric charge accumulated in the secondary battery 22 is supplied to the discharged pixel (cell).
  • connection of the pixel (cell) and the secondary battery 22 may be performed, for example, by connecting one line at a time and sequentially scanning the line if the cell array 20 is an active matrix system. It may be performed by preparing the electrical circuit shown in the number of lines.
  • the changeover switch 24 may be used as the V terminal to supply power to the pixels from the external power supply 25.
  • the secondary battery 22 is used as the power storage unit, but the power storage unit may be a capacitor having a large capacity.
  • the power storage unit may be a capacitor having a large capacity.
  • the secondary battery include a lithium ion battery, a nickel metal hydride battery, a nickel cadmium battery, and an organic radical battery.
  • the capacitor include an electric double layer capacitor and a lithium ion capacitor.
  • FIG. 3 is a cross-sectional view schematically showing the entire configuration of an EC display device as an example of the display device of the present invention.
  • 30 is a display unit (EC cell array)
  • 36 is a transparent surface substrate (EC).
  • 37) indicates a TFT (thin film transistor) array, operation electrodes and wiring
  • 38 indicates a back substrate (glass)
  • 39 indicates a reflector.
  • TFT thin film transistor
  • each EC cell (pixel) is divided.
  • FIG. 4 shows an example of an EC cell in the EC display device shown in FIG. 4, the same parts as those in FIG. 3 are denoted by the same reference numerals.
  • this EC cell has a structure in which an electrolyte 30b is filled between a working electrode 37a on which an EC material 30a is disposed and a transparent counter electrode 36b.
  • each EC cell is formed by being separated by partition walls 30c and 30d.
  • the members 30b to 30d may be the same as those used in conventionally known EC display devices.
  • display / non-display is switched by setting the potential of the working electrode 37a with respect to the transparent counter electrode 36b to a predetermined value.
  • each EC cell can be set to an arbitrary value by using a conventionally known active matrix driving method as it is.
  • the transparent counter electrode 36b of the EC cells 50a to 50d shown in FIG. 4 is set to the ground potential of the EC display device, and the operation electrode 37a is connected to the active matrix FET (field effect transistor) arrays 51a to 51d.
  • the EC display device shown in FIG. 3 is configured.
  • the EC display device further includes row selection signal lines 52a to 52c, one electric wiring 53, column selection switches 54a to 54c, and a display driver circuit (not shown).
  • the row selection signal lines 52a to 52c select a row having an EC cell to be rewritten.
  • the electric wiring 53 is connected to the electric circuit shown in FIG.
  • the column selection switches 54a to 54c select a column having EC cells to be rewritten.
  • the display driver circuit controls the row selection signal lines 52a to 52c and the column selection switches 54a to 54c.
  • FIG. 5 for convenience, three to four members other than the electrical wiring 53 and the display driver circuit are shown. However, in actuality, these members are in a number corresponding to the resolution of the EC display device. is there.
  • the display rewriting procedure of this EC display device is as follows.
  • the row selection signal is once cut off.
  • all the column selection switches corresponding to the pixels (EC cells) that are to be charged after rewriting the display in the current discharging state are turned ON.
  • the changeover switch 24 of the electric circuit shown in FIG. 2 is switched to the C terminal side, the row selection signal of the same row is inputted again, and the electric charge is discharged from the secondary battery 22 in the electric circuit shown in FIG. Electric charge is supplied to the discharged pixel (EC cell) to be charged.
  • the present invention can also be applied to the case where the pixel is expressed by a gradation of two or more levels. It is. In that case, measures such as adding a voltage regulator to the column selection switch or changing the power supply time according to the gray level when supplying electric charge to the discharged pixel to be charged are taken.
  • the display is rewritten simultaneously by the active matrix method. However, if the number of pixels is small, the display may be rewritten for each pixel.
  • the transfer of the charge from the charged pixel to discharge the charge to the secondary battery and the power supply to the discharged pixel to charge from the secondary battery are repeated for each row. Then, after transferring the charge from the charged pixel for discharging the entire display unit to the secondary battery, the power is supplied to the discharged pixel from the secondary battery for charging the entire display unit. May be performed. In this case, since the amount of charge transferred from the charged pixel to which the charge is to be discharged to the secondary battery is leveled over the entire display unit, even when the display / non-display pixel is biased in the display unit, 2 This is advantageous in that the charge transferred to the secondary battery can be effectively used.
  • the secondary battery in the transfer of the charge from the charged pixel to which the charge is to be discharged to the secondary battery, the secondary battery is connected by the second electric wiring via the booster circuit 23 in the electric circuit shown in FIG.
  • the charge is transferred to the battery 22, but when the voltage of the secondary battery is lower than the voltage of the charged pixel, the charge is transferred to the secondary battery 22 by the first electric wiring as described above.
  • a configuration in which electric charges are supplied to the discharged pixels to be charged from the secondary battery 22 by the second electric wiring via the booster circuit 23 is also possible.
  • the input terminal of the booster circuit 23 is connected to the secondary battery 22, and the output terminal of the booster circuit 23 is connected to the cell array 20.
  • the examples so far relate to EC display devices.
  • an ED display device which is a similar electrochemical device, the voltage between the terminals of the cell fluctuates in the display-non-display state, and the secondary battery
  • the present invention can be applied in exactly the same way as long as it can be considered.
  • the display device of the present invention can be used as, for example, electronic paper, an electronic blackboard, and an electronic signboard. However, these uses are only examples, and the present invention is not limited thereto.
  • the display device When the voltage of at least one pixel is lower than the voltage of the power storage unit and the charge of the at least one pixel is reduced, the display device operates according to the present invention. Is selected and the charge of at least one of the pixels is increased, and when the first electrical wiring is selected in the switch unit and the voltage of the at least one pixel is higher than the voltage of the power storage unit, at least one When the charge of one pixel is reduced, the first electrical wiring is selected in the switch unit, and when the charge of at least one of the pixels is increased, the second electrical wiring is selected in the switch unit. It is characterized by that.
  • the above description of the display device of the present invention can be cited.
  • a display unit including a plurality of pixels including a material through which charges come and go; A power storage unit that charges and discharges electric charges emitted from at least one of the pixels; First electrical wiring connecting the display unit and the power storage unit; A second electrical wiring connecting the display unit and the power storage unit via a booster circuit; A display device comprising: a switch unit that selects one of the first electric wiring and the second electric wiring.
  • a display unit including a plurality of pixels including a material through which charges come and go; A power storage unit that charges and discharges electric charges emitted from at least one of the pixels; Charge / discharge means for transferring charge between the display unit and the power storage unit, The charging / discharging means When reducing the charge of at least one of the pixels, the charge discharged from the at least one of the pixels is charged into the power storage unit, A display device, wherein when the charge of at least one of the pixels is increased, the charge charged in the power storage unit is discharged.
  • the charging / discharging means includes a switch part, The display device according to appendix 5, wherein charging and discharging in the power storage unit can be selected by the switch unit.
  • Appendix 7 In addition, including an external power supply, The display device according to any one of appendices 1 to 4, or 6, wherein power is supplied to at least one of the pixels by the external power source.
  • Appendix 10 The display device according to any one of appendices 1 to 9, wherein the pixel includes an electrochromic material.
  • Appendix 12 The display device according to any one of appendices 1 to 9, wherein the display unit is an electrodeposition system.
  • Appendix 14 An electronic blackboard using the display device according to any one of appendices 1 to 12.
  • An operation method of the display device comprising: When the voltage of at least one of the pixels is lower than the voltage of the power storage unit, When reducing the charge of at least one of the pixels, the second electrical wiring is selected in the switch unit, When increasing the charge of at least one of the pixels, the first electrical wiring is selected in the switch unit, When the voltage of at least one of the pixels is higher than the voltage of the power storage unit, When reducing the charge of at least one of the pixels, the first electrical wiring is selected in the switch unit, The method according to claim 1, wherein when the charge of at least one of the pixels is increased, the second electrical wiring is selected in the switch unit.
  • the display device of the present invention can be applied to a wide range of applications such as electronic paper, an electronic blackboard, and an electronic signboard.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

Provided is a display device with which it is possible to significantly reduce power consumption. This display device comprises: a cell array (20) further comprising a plurality of pixels provided with a material whereupon an electric charge enters and exits; a secondary battery (22) which charges and discharges the electric charge which is discharged from at least one pixel; a first electric wiring which connects the cell array (20) and the secondary battery (22); a second electric wiring which connects the cell array (20) and the secondary battery (22) via a boost circuit (23); and a changeover switch (24) which selects between the first electric wiring and the second electric wiring.

Description

表示デバイスDisplay device
　本発明は、表示デバイスに関する。 The present invention relates to a display device.
　従来から、電気化学的な酸化・還元によって電極の可視光域の吸収が変化するエレクトロクロミズム（ＥＣ）又はエレクトロデポジション（ＥＤ）は、表示デバイスに応用されている。例えば、特許文献１及び２には、ＥＣを用いた表示デバイス及びその電極が開示されている。これらの表示デバイスは、液晶ディスプレイ（ＬＣＤ）では実現が困難な表示の不揮発性及び目に対する優しさから、電子ペーパなどへの応用が期待されている。 Conventionally, electrochromism (EC) or electrodeposition (ED) in which the absorption in the visible light region of an electrode is changed by electrochemical oxidation / reduction has been applied to display devices. For example, Patent Documents 1 and 2 disclose display devices using EC and electrodes thereof. These display devices are expected to be applied to electronic paper and the like because of the non-volatile display and gentleness to the eyes, which are difficult to realize with a liquid crystal display (LCD).
　電子ペーパとしては、特許文献３に開示されているマイクロカプセル型、特許文献４に開示されている電子粉流体型、特許文献５に開示されているコレステリック液晶型などの方式が既に実用化されている。これらと比較した場合、ＥＣを用いた表示デバイスの利点は、高い反射率、高いコントラスト比、低い駆動電圧にある。特に、駆動電圧については、他の方式の電子ペーパが、１０Ｖ～９０Ｖといった高い電圧を表示書き換えに要するのに対し、ＥＣは、２Ｖ以下で書き換えが可能である点で優位である。 As the electronic paper, methods such as a microcapsule type disclosed in Patent Document 3, an electronic powder fluid type disclosed in Patent Document 4, and a cholesteric liquid crystal type disclosed in Patent Document 5 have already been put into practical use. Yes. Compared with these, the advantage of the display device using EC is high reflectance, high contrast ratio, and low driving voltage. In particular, with respect to the drive voltage, other types of electronic paper require a high voltage of 10V to 90V for display rewriting, whereas EC is advantageous in that it can be rewritten at 2V or less.
　ＥＣ又はＥＤなどの電気化学的反応を用いた表示デバイスは、不揮発性の電子ペーパ全般に共通する「表示の保持に要する電力が少ない特徴」を有するのに加えて、それらの電子ペーパの中で、最も低い電圧での駆動が可能である。 Display devices using an electrochemical reaction such as EC or ED have “features that require less power to maintain the display” common to all non-volatile electronic papers. The drive with the lowest voltage is possible.
　しかしながら、現状の電子ペーパすべてに言えることであるが、表示の一回分の書き換えに要する電力は、十分に小さいというわけではない。一定時間静止画を表示する用途では、電子ペーパは、ＬＣＤに比べて格段に低消費電力であるが、例えば、動画表示程度の速さで書き換えを行った場合には、必要な電力がＬＣＤよりも大きくなる。これは、ＥＣ又はＥＤなどの電気化学的反応を用いた表示デバイスにも当てはまり、電子ペーパの更なる用途拡大のために解決すべき大きな課題となっている。 However, as is the case with all current electronic papers, the power required to rewrite a single display is not sufficiently small. For applications that display still images for a certain period of time, electronic paper consumes much less power than LCDs. For example, when rewriting is performed at the speed of moving image display, the necessary power is less than that of LCDs. Also grows. This also applies to a display device using an electrochemical reaction such as EC or ED, and has become a big problem to be solved for further expanding the use of electronic paper.
　マイクロカプセル型及び電子粉流体型の電子ペーパの書き換えに要する電力が大きい理由は、印加電圧が大きいためであるが、低い電圧で駆動できるＥＣ又はＥＤにおいては、書き換え電流が比較的大きいことにある。これらの表示デバイスは、２次電池のアレイとみなすこともでき、個々の画素（セル）の充放電反応で表示・非表示を切り替えている。ＬＣＤの各画素がキャパシタとみなせることを踏まえると、ＥＣ又はＥＤの書き換え電力は、ＬＣＤに対して、「２次電池への充電」対「キャパシタへの充電」程度の比で大きくなると考えられる。電気化学的反応を用いた表示デバイスが本質的に持っている、２次電池及びキャパシタのエネルギー密度の比に相当する不利を解消するためには、動作方法、セル構造、材料の改良も含めて、少ない電荷移動量で大きな吸収スペクトル変化を実現する必要がある。 The reason why the power required for the rewriting of the microcapsule type and the electronic powder fluid type electronic paper is large is that the applied voltage is large, but in EC or ED that can be driven at a low voltage, the rewriting current is relatively large. . These display devices can be regarded as an array of secondary batteries, and display / non-display is switched by charge / discharge reactions of individual pixels (cells). Considering that each pixel of the LCD can be regarded as a capacitor, it is considered that the rewriting power of EC or ED increases with respect to the LCD at a ratio of “charging the secondary battery” to “charging the capacitor”. In order to eliminate the disadvantage corresponding to the ratio of energy density of secondary battery and capacitor inherent in display devices using electrochemical reaction, including improvements in operation method, cell structure and materials Therefore, it is necessary to realize a large change in absorption spectrum with a small amount of charge transfer.
　特許文献６には、ＥＣを用いた表示デバイスにおいて、表示を書き換える際に色が消える部分（セル）と色が着く部分（セル）との間をつなぐスイッチを開閉することにより、電荷の移送を行う技術が開示されている。 In Patent Document 6, in a display device using EC, the transfer of electric charge is performed by opening and closing a switch that connects between a portion where the color disappears (cell) and a portion where the color is reached (cell) when rewriting the display. Techniques to do are disclosed.
特公昭５９－２２９４２号公報Japanese Examined Patent Publication No. 59-22294 特開昭５８－１４９０８９号公報JP 58-149089 A 特表２００２－５２６８１２号公報JP-T-2002-526812 特開２００３－２５５４０１号公報JP 2003-255401 A 特許第３９４４６７８号公報Japanese Patent No. 3944678 特公平１－１７１３７号公報Japanese Patent Publication No. 1-17137
　特許文献６に開示されている技術によれば、表示書き換えのための電力を一部削減することができる。しかしながら、特許文献６に開示されている技術では、（１）直接セル間を接続するだけでは完全に電荷を移しきることができないこと、（２）着色されるセル数及び消色されるセル数が同程度でないと有効に電力の再利用ができないこと、などから、大幅な電力削減は望めない。 According to the technology disclosed in Patent Document 6, it is possible to partially reduce the power for display rewriting. However, in the technique disclosed in Patent Document 6, (1) it is impossible to completely transfer charges by simply connecting cells directly, (2) the number of cells to be colored and the number of cells to be decolored Since the power cannot be effectively reused if the power is not the same, a significant reduction in power cannot be expected.
　そこで、本発明は、消費電力を大幅に削減可能な表示デバイスを提供することを目的とする。 Therefore, an object of the present invention is to provide a display device that can greatly reduce power consumption.
　前記目的を達成するために、本発明の表示デバイスは、
電荷が出入りする材料を含む画素を複数備えた表示部と、
少なくとも一つの前記画素から放出される電荷を充放電する蓄電部と、
前記表示部及び前記蓄電部を接続する第１の電気配線と、
昇圧回路を介して前記表示部及び前記蓄電部を接続する第２の電気配線と、
前記第１の電気配線及び前記第２の電気配線のいずれかを選択するスイッチ部と
を含むことを特徴とする。 In order to achieve the above object, the display device of the present invention comprises:
A display unit including a plurality of pixels including a material through which charges come and go;
A power storage unit that charges and discharges electric charges emitted from at least one of the pixels;
First electrical wiring connecting the display unit and the power storage unit;
A second electrical wiring connecting the display unit and the power storage unit via a booster circuit;
And a switch unit for selecting one of the first electric wiring and the second electric wiring.
　また、本発明の表示デバイスは、
電荷が出入りする材料を含む画素を複数備えた表示部と、
少なくとも一つの前記画素から放出される電荷を充放電する蓄電部と、
前記表示部及び前記蓄電部の間で電荷を移送する充放電手段とを含み、
前記充放電手段が、
少なくとも一つの前記画素の電荷を減らすとき、少なくとも一つの前記画素から放出される電荷を前記蓄電部に充電し、
少なくとも一つの前記画素の電荷を増やすとき、前記蓄電部に充電された電荷を放電する
ことを特徴とする。 The display device of the present invention is
A display unit including a plurality of pixels including a material through which charges come and go;
A power storage unit that charges and discharges electric charges emitted from at least one of the pixels;
Charge / discharge means for transferring charge between the display unit and the power storage unit,
The charging / discharging means
When reducing the charge of at least one of the pixels, the charge discharged from the at least one of the pixels is charged into the power storage unit,
When the charge of at least one of the pixels is increased, the charge charged in the power storage unit is discharged.
　本発明によれば、消費電力を大幅に削減可能な表示デバイスを提供できる。 According to the present invention, a display device capable of significantly reducing power consumption can be provided.
図１は、本発明の表示デバイスの原理を説明するための模式図である。FIG. 1 is a schematic diagram for explaining the principle of the display device of the present invention. 図２は、本発明の表示デバイスにおける電気回路の一例を示す図である。FIG. 2 is a diagram showing an example of an electric circuit in the display device of the present invention. 図３は、本発明の表示デバイス（エレクトロクロミック（以下、エレクトロクロミズムと同様に「ＥＣ」とする。）表示デバイス）の全体構成の一例を示す模式断面図である。FIG. 3 is a schematic cross-sectional view showing an example of the overall configuration of the display device of the present invention (electrochromic (hereinafter, referred to as “EC” similarly to electrochromism) display device). 図４は、図３に示すＥＣ表示デバイスにおけるＥＣセルの一例を示す断面図である。4 is a cross-sectional view showing an example of an EC cell in the EC display device shown in FIG. 図５は、図３に示すＥＣ表示デバイスにおけるセル選択機構の一例を示す図である。FIG. 5 is a diagram showing an example of a cell selection mechanism in the EC display device shown in FIG.
　本発明の表示デバイスは、表示書き換えにおいて放出することになる画素に溜まっている電荷を、蓄電部に蓄積しておき、表示書き換えにおいて新たに充電が行われる画素の描画などに再利用することを特徴とする。本発明において、「画素」は、セル、表示セル、ピクセルと同義である。 In the display device of the present invention, the charge accumulated in the pixel that is to be released in display rewriting is stored in the power storage unit and reused for drawing a pixel that is newly charged in display rewriting. Features. In the present invention, “pixel” is synonymous with cell, display cell, and pixel.
　前述のように、ＥＣ又はＥＤなどの電気化学反応を用いた表示デバイスの各画素は、微細な２次電池とみなすことができる。表示部において、色の異なる部分（画素）は、電荷の蓄積状態が異なり、それぞれが２次電池の充電状態又は放電状態に相当する。着色部、非着色部のどちらが、充電状態に相当するかは、使用されている材料の組み合わせにより異なる。これ以降、色の異なる画素（セル）を区別するために、単に「充電状態」、「放電状態」と表記する。表示を書き換えるとセルの端子間電圧が下降することになる充電状態の画素には、実際に電荷が蓄積されているため書き換え時に電荷を放出し、表示書き換えでセルの端子間電圧が上昇する放電状態の画素は、書き換えに際して電荷の注入（給電）を必要とする。 As described above, each pixel of a display device using an electrochemical reaction such as EC or ED can be regarded as a fine secondary battery. In the display portion, portions (pixels) having different colors have different charge accumulation states, and each corresponds to a charged state or a discharged state of the secondary battery. Which of the colored part and the non-colored part corresponds to the charged state depends on the combination of the materials used. Hereinafter, in order to distinguish pixels (cells) having different colors, they are simply referred to as “charged state” and “discharged state”. When the display is rewritten, the voltage between the terminals of the cell will drop. The charged pixel actually discharges the charge when it is rewritten, and the discharge increases the voltage between the terminals of the cell when the display is rewritten. The pixel in the state requires charge injection (power supply) for rewriting.
　従来のＥＣ又はＥＤを用いた表示デバイスでは、放出される電荷はそのまま捨てられていたため、表示の書き換えには、新規に充電される画素分に相当する比較的大きな電力が必要であった。これに対し、本発明の表示デバイスによれば、放出される電荷を蓄電部に蓄積しておき、再描画などの表示デバイスの駆動に再利用できるため、大幅な省電力化を実現できる。 In the conventional display device using EC or ED, since the emitted charge is discarded as it is, rewriting of the display requires a relatively large electric power corresponding to a newly charged pixel. On the other hand, according to the display device of the present invention, the released charge can be stored in the power storage unit and reused for driving the display device such as redrawing, so that significant power saving can be realized.
　図１を用いて、本発明の原理を説明する。図１においては、黒塗りの四角形（■）が充電状態を、白抜きの四角形（□）が放電状態を示す。まず、図１（ａ）に示すように、表示書き換えにおいて充電状態の画素から放出される電荷を、蓄電部１２に移す。つぎに、図１（ｂ）及び（ｃ）に示すように、表示書き換えにおいて新たに充電が行われる画素の描画に蓄電部１２に蓄積しておいた電荷を再利用する。なお、図１は、本発明の表示デバイスを模式的に示したものであり、便宜上、表示部１０の備える画素１１の数を９つとしているが、実際には、表示部１０は、表示デバイスの解像度に応じた数の画素１１を備える。 The principle of the present invention will be described with reference to FIG. In FIG. 1, a black square (■) indicates a charged state, and a white square (□) indicates a discharged state. First, as shown in FIG. 1A, the charge released from the charged pixel in display rewriting is transferred to the power storage unit 12. Next, as shown in FIGS. 1B and 1C, the charge accumulated in the power storage unit 12 is reused for drawing a pixel that is newly charged in display rewriting. FIG. 1 schematically shows the display device of the present invention. For convenience, the number of pixels 11 included in the display unit 10 is nine. However, in actuality, the display unit 10 is a display device. The number of pixels 11 according to the resolution is provided.
　本発明の表示デバイスにおいて、例えば、画素１１は、電荷が出入りする材料としてＥＣ材料を含むＥＣセルであってもよい。また、後述のように、本発明の表示デバイスは、表示部１０がＥＤ方式であるＥＤ表示デバイスであってもよい。前記ＥＣ材料としては、例えば、酸化タングステン（ＷＯ３等）、プルシアンブルーに代表されるヘキサシアノ鉄を含む錯化合物、ビオロゲンなどの有機エレクトロクロミック材料などを使用できる。 In the display device of the present invention, for example, the pixel 11 may be an EC cell including an EC material as a material through which electric charges enter and exit. As will be described later, the display device of the present invention may be an ED display device in which the display unit 10 is an ED system. As the EC material, for example, tungsten oxide (WO 3 or the like), a complex compound containing hexacyano iron typified by Prussian blue, an organic electrochromic material such as viologen, or the like can be used.
　図２に、本発明の表示デバイスにおける電気回路の一例を示す。図示のとおり、この電気回路は、蓄電部（２次電池）２２と、昇圧回路２３と、スイッチ部（切り替えスイッチ）２４と、外部電源２５とを主要な構成要素として含む。前記電気回路において、外部電源２５は、任意の構成要素であり、含まれなくともよいが、含むことが好ましい。切り替えスイッチ２４をＣ端子側とすることで、表示部（セルアレイ）２０及び２次電池２２を接続する第１の電気配線が形成される。また、切り替えスイッチ２４をＤ端子側とすることで、昇圧回路２３を介してセルアレイ２０及び２次電池２２を接続する第２の電気配線が形成される。図２に示すように、昇圧回路２３の入力端子が、セルアレイ２０に接続され、昇圧回路２３の出力端子が、２次電池２２に接続されていることが好ましい。さらに、切り替えスイッチ２４をＶ端子側とすることで、外部電源２５によるセルアレイ２０への給電を選択可能である。なお、本発明の表示デバイスは、セルアレイ２０及び２次電池２２が充放電手段により接続された構成であってもよい。前記充放電手段は、単なる電気配線であってもよいが、２次電池２２における充電及び放電を選択可能とするスイッチ部を含むことが好ましく、切り替えスイッチ２４、前記第１の電気配線及び前記第２の電気配線を含むことがより好ましい。 FIG. 2 shows an example of an electric circuit in the display device of the present invention. As illustrated, this electric circuit includes a power storage unit (secondary battery) 22, a booster circuit 23, a switch unit (switching switch) 24, and an external power supply 25 as main components. In the electric circuit, the external power supply 25 is an optional component and may not be included, but is preferably included. By setting the changeover switch 24 to the C terminal side, a first electrical wiring for connecting the display unit (cell array) 20 and the secondary battery 22 is formed. Further, by setting the changeover switch 24 to the D terminal side, a second electrical wiring for connecting the cell array 20 and the secondary battery 22 via the booster circuit 23 is formed. As shown in FIG. 2, the input terminal of the booster circuit 23 is preferably connected to the cell array 20, and the output terminal of the booster circuit 23 is preferably connected to the secondary battery 22. Furthermore, the power supply to the cell array 20 by the external power supply 25 can be selected by setting the changeover switch 24 to the V terminal side. The display device of the present invention may have a configuration in which the cell array 20 and the secondary battery 22 are connected by charging / discharging means. The charging / discharging means may be a simple electric wiring, but preferably includes a switch unit that allows the charging and discharging of the secondary battery 22 to be selected, and includes the changeover switch 24, the first electric wiring, and the first electric wiring. It is more preferable that two electrical wirings are included.
　つぎに、図２に示す電気回路を含む本発明の表示デバイスの駆動方法について説明する。 Next, a method for driving the display device of the present invention including the electric circuit shown in FIG. 2 will be described.
　まず、表示書き換えにおいて電荷を放出すべき充電状態の画素（セル）を２次電池２２に接続する。このとき、充電状態の画素（セル）の電圧が２次電池２２の電圧より低い場合には、切り替えスイッチ２４をＤ端子側にして、充電状態の画素（セル）を昇圧回路２３を介した第２の電気配線により２次電池２２に接続する。一方、充電状態の画素（セル）の電圧が２次電池２２の電圧より高い場合には、切り替えスイッチ２４をＣ端子側にして、充電状態の画素（セル）を第１の電気配線により２次電池２２に接続する。このようにして、充電状態の画素（セル）から放出される電荷を、２次電池２２に蓄積する。 First, a pixel (cell) in a charged state that should be discharged in display rewriting is connected to the secondary battery 22. At this time, if the voltage of the charged pixel (cell) is lower than the voltage of the secondary battery 22, the changeover switch 24 is set to the D terminal side, and the charged pixel (cell) is passed through the booster circuit 23. 2 is connected to the secondary battery 22 by electrical wiring. On the other hand, when the voltage of the pixel (cell) in the charged state is higher than the voltage of the secondary battery 22, the changeover switch 24 is set to the C terminal side, and the pixel (cell) in the charged state is secondary by the first electric wiring. Connect to battery 22. In this manner, the charge discharged from the charged pixel (cell) is accumulated in the secondary battery 22.
　つぎに、表示書き換えにおいて新たに充電が行うべき放電状態の画素（セル）を２次電池２２に接続する。このとき、放電状態の画素（セル）の電圧が２次電池２２の電圧より低い場合には、切り替えスイッチ２４をＣ端子側にして、放電状態の画素（セル）を第１の電気配線により２次電池２２に接続する。一方、放電状態の画素（セル）の電圧が２次電池２２の電圧より高い場合には、切り替えスイッチ２４をＤ端子側にして、放電状態の画素（セル）を昇圧回路２３を介した第２の電気配線により２次電池２２に接続する。この場合には、図２において、昇圧回路２３の入力端子を、２次電池２２に接続し、昇圧回路２３の出力端子を、セルアレイ２０に接続する。このようにして、２次電池２２に蓄積された電荷を、放電状態の画素（セル）に給電する。 Next, a discharge state pixel (cell) to be newly charged in display rewriting is connected to the secondary battery 22. At this time, when the voltage of the discharge state pixel (cell) is lower than the voltage of the secondary battery 22, the changeover switch 24 is set to the C terminal side, and the discharge state pixel (cell) is set to 2 by the first electric wiring. The secondary battery 22 is connected. On the other hand, when the voltage of the pixel (cell) in the discharged state is higher than the voltage of the secondary battery 22, the changeover switch 24 is set to the D terminal side, and the pixel (cell) in the discharged state is connected to the second through the booster circuit 23. The secondary battery 22 is connected by electrical wiring. In this case, in FIG. 2, the input terminal of the booster circuit 23 is connected to the secondary battery 22, and the output terminal of the booster circuit 23 is connected to the cell array 20. In this way, the electric charge accumulated in the secondary battery 22 is supplied to the discharged pixel (cell).
　画素（セル）及び２次電池２２の接続は、例えば、セルアレイ２０がアクティブマトリクス方式であるならば、一ライン分を同時に接続し、順次ラインをスキャンすることで行われてもよいし、図２に示す電気回路をライン本数分準備することで行われてもよい。 The connection of the pixel (cell) and the secondary battery 22 may be performed, for example, by connecting one line at a time and sequentially scanning the line if the cell array 20 is an active matrix system. It may be performed by preparing the electrical circuit shown in the number of lines.
　セルアレイ２０中の画素（セル）に電荷が所定量に満たないものがあるときには、切り替えスイッチ２４をＶ端子側として、前記画素に外部電源２５から給電してもよい。 When some of the pixels (cells) in the cell array 20 have less than a predetermined amount of charge, the changeover switch 24 may be used as the V terminal to supply power to the pixels from the external power supply 25.
　図２に示す電気回路では、前記蓄電部として２次電池２２を用いているが、前記蓄電部は、容量の大きなキャパシタであってもよい。２次電池を用いる場合、画素（セル）を所望の速度で充電できるだけの起電力を持つものが好ましいが、適当な電圧変換回路を充電－放電の両方向に備えることで、起電力の小さい２次電池を用いることも可能である。前記２次電池としては、例えば、リチウムイオン電池、ニッケル水素電池、ニッカド電池、有機ラジカル電池などがあげられる。前記キャパシタとしては、例えば、電気２重層キャパシタ、リチウムイオンキャパシタなどがあげられる。 In the electric circuit shown in FIG. 2, the secondary battery 22 is used as the power storage unit, but the power storage unit may be a capacitor having a large capacity. In the case of using a secondary battery, it is preferable to have an electromotive force that can charge a pixel (cell) at a desired speed. However, by providing an appropriate voltage conversion circuit in both the charge and discharge directions, a secondary with a low electromotive force can be obtained. It is also possible to use a battery. Examples of the secondary battery include a lithium ion battery, a nickel metal hydride battery, a nickel cadmium battery, and an organic radical battery. Examples of the capacitor include an electric double layer capacitor and a lithium ion capacitor.
　本発明の表示デバイスにおいて、前記蓄電部の配置箇所は、任意である。例えば、図３に示すように、蓄電部３２を、表示デバイス裏側全体に配置することで、面積の増大を抑えながら、十分な蓄電容量を確保することができる。なお、図３は、本発明の表示デバイスの一例として、ＥＣ表示デバイスの全体構成を模式的に示した断面図であり、３０は、表示部（ＥＣセルアレイ）を、３６は、透明表面基板（ガラス）及び透明対向電極を、３７は、ＴＦＴ（薄膜トランジスタ）アレイ、動作電極及び配線を、３８は、背面基板（ガラス）を、３９は、反射板を示す。前記各部材としては、従来公知のＥＣ表示デバイスに用いられているものと同様のものを用いればよい。図３においては、前記透明表面基板及び背面基板３８にガラスを用いているが、従来公知のＥＣ表示デバイスに用いられているガラス以外の材料を用いてもよい。蓄電部３２、前記透明表面基板（ガラス）、背面基板（ガラス）３８及び反射板３９を除く各部材は、図３においては簡潔に一つにまとめて示しているが、実際には、図４及び図５を用いて後述するように、個々のＥＣセル（画素）毎に区切られている。 In the display device of the present invention, the location of the power storage unit is arbitrary. For example, as shown in FIG. 3, by disposing the power storage unit 32 on the entire back side of the display device, it is possible to ensure a sufficient power storage capacity while suppressing an increase in area. FIG. 3 is a cross-sectional view schematically showing the entire configuration of an EC display device as an example of the display device of the present invention. 30 is a display unit (EC cell array), and 36 is a transparent surface substrate (EC). 37) indicates a TFT (thin film transistor) array, operation electrodes and wiring, 38 indicates a back substrate (glass), and 39 indicates a reflector. As each member, the same members as those used in conventionally known EC display devices may be used. In FIG. 3, glass is used for the transparent surface substrate and the back substrate 38, but materials other than glass used in conventionally known EC display devices may be used. The members excluding the power storage unit 32, the transparent surface substrate (glass), the back substrate (glass) 38, and the reflection plate 39 are collectively shown in FIG. 3, but actually, FIG. As will be described later with reference to FIG. 5, each EC cell (pixel) is divided.
　図４に、図３に示すＥＣ表示デバイスにおけるＥＣセルの一例を示す。図４において、図３と同一部分には、同一符号を付している。図示のとおり、このＥＣセルは、ＥＣ材料３０ａが配置された動作電極３７ａと透明対向電極３６ｂとの間に電解質３０ｂが満たされた構造である。図３に示すＥＣ表示デバイスにおいて、個々のＥＣセルは、隔壁３０ｃ及び３０ｄで区切られることで形成されている。前記各部材３０ｂ～３０ｄとしては、従来公知のＥＣ表示デバイスに用いられているものと同様のものを用いればよい。このＥＣセルでは、透明対向電極３６ｂに対する動作電極３７ａの電位を所定の値に設定することによって、表示・非表示を切り替える。個々のＥＣセルの電位は、従来公知のアクティブマトリクス方式の駆動法をそのまま用いて任意の値に設定することができる。例えば、図５に示すように、図４に示すＥＣセル５０ａ～５０ｄの透明対向電極３６ｂをＥＣ表示デバイスの接地電位とし、動作電極３７ａをアクティブマトリクスＦＥＴ（電界効果トランジスタ）アレイ５１ａ～５１ｄに接続することで図３に示すＥＣ表示デバイスを構成する。このＥＣ表示デバイスは、さらに、行選択信号線５２ａ～５２ｃと、一本の電気配線５３と、列選択スイッチ５４ａ～５４ｃと、表示ドライバ回路（図示せず）とを含む。行選択信号線５２ａ～５２ｃは、表示書き換えの対象となるＥＣセルを有する行を選択する。電気配線５３は、図２に示す電気回路に接続する。列選択スイッチ５４ａ～５４ｃは、表示書き換えの対象となるＥＣセルを有する列を選択する。表示ドライバ回路は、行選択信号線５２ａ～５２ｃ及び列選択スイッチ５４ａ～５４ｃを制御する。なお、図５においては、便宜上、電気配線５３及び表示ドライバ回路以外の各部材を３つ乃至４つ示しているが、実際には、これらの部材は、ＥＣ表示デバイスの解像度に応じた数である。このＥＣ表示デバイスの表示書き換え手順は、つぎのとおりである。 FIG. 4 shows an example of an EC cell in the EC display device shown in FIG. 4, the same parts as those in FIG. 3 are denoted by the same reference numerals. As shown in the figure, this EC cell has a structure in which an electrolyte 30b is filled between a working electrode 37a on which an EC material 30a is disposed and a transparent counter electrode 36b. In the EC display device shown in FIG. 3, each EC cell is formed by being separated by partition walls 30c and 30d. The members 30b to 30d may be the same as those used in conventionally known EC display devices. In this EC cell, display / non-display is switched by setting the potential of the working electrode 37a with respect to the transparent counter electrode 36b to a predetermined value. The potential of each EC cell can be set to an arbitrary value by using a conventionally known active matrix driving method as it is. For example, as shown in FIG. 5, the transparent counter electrode 36b of the EC cells 50a to 50d shown in FIG. 4 is set to the ground potential of the EC display device, and the operation electrode 37a is connected to the active matrix FET (field effect transistor) arrays 51a to 51d. Thus, the EC display device shown in FIG. 3 is configured. The EC display device further includes row selection signal lines 52a to 52c, one electric wiring 53, column selection switches 54a to 54c, and a display driver circuit (not shown). The row selection signal lines 52a to 52c select a row having an EC cell to be rewritten. The electric wiring 53 is connected to the electric circuit shown in FIG. The column selection switches 54a to 54c select a column having EC cells to be rewritten. The display driver circuit controls the row selection signal lines 52a to 52c and the column selection switches 54a to 54c. In FIG. 5, for convenience, three to four members other than the electrical wiring 53 and the display driver circuit are shown. However, in actuality, these members are in a number corresponding to the resolution of the EC display device. is there. The display rewriting procedure of this EC display device is as follows.
　まず、図５の、ある一つの行に着目し、現在充電状態で、表示書き換え後に放電状態となるべき画素（ＥＣセル）に対応する列選択スイッチのみをすべてＯＮにする。つぎに、図２に示す電気回路の切り替えスイッチ２４をＤ端子側とした後、その行の行選択信号を入力する。これにより、電荷を放出すべき充電状態の画素（ＥＣセル）から、図２に示す電気回路内の２次電池２２に電荷を移送する。 First, paying attention to one row in FIG. 5, all the column selection switches corresponding to the pixels (EC cells) that are to be discharged after rewriting the display in the current charging state are turned ON. Next, after the changeover switch 24 of the electric circuit shown in FIG. 2 is set to the D terminal side, a row selection signal for that row is input. As a result, the charge is transferred from the charged pixel (EC cell) to be discharged to the secondary battery 22 in the electric circuit shown in FIG.
　その行内の電荷を放出すべき充電状態の画素（ＥＣセル）から電荷をすべて２次電池２２に移送した後、一度、行選択信号を切断する。ついで、現在放電状態で、表示書き換え後に充電状態となるべき画素（ＥＣセル）に対応する列選択スイッチのみをすべてＯＮにする。つぎに、図２に示す電気回路の切り替えスイッチ２４をＣ端子側に切り替えた後、再び同じ行の行選択信号を入力して、図２に示す電気回路内の２次電池２２から、電荷を充電すべき放電状態の画素（ＥＣセル）に電荷を給電する。 After transferring all charges from the charged pixel (EC cell) to discharge the charges in the row to the secondary battery 22, the row selection signal is once cut off. Next, all the column selection switches corresponding to the pixels (EC cells) that are to be charged after rewriting the display in the current discharging state are turned ON. Next, after the changeover switch 24 of the electric circuit shown in FIG. 2 is switched to the C terminal side, the row selection signal of the same row is inputted again, and the electric charge is discharged from the secondary battery 22 in the electric circuit shown in FIG. Electric charge is supplied to the discharged pixel (EC cell) to be charged.
　前記工程で、充電すべき放電状態の画素（ＥＣセル）に電荷を給電できなかった場合、すなわち、表示書き換えが完了する前に、図２に示す電気回路内の２次電池２２に蓄積された電荷が尽きてしまった場合には、図２に示す電気回路内の切り替えスイッチ２４をＶ端子側に切り替えて、図２に示す電気回路内の外部電源２５による給電を選択する。以上の手順をすべての行について繰り返すことにより、表示部全体の表示書き換えを行うことができる。 In the above process, when charge cannot be supplied to the discharged pixel (EC cell) to be charged, that is, before the display rewriting is completed, it is accumulated in the secondary battery 22 in the electric circuit shown in FIG. When the electric charge is exhausted, the selector switch 24 in the electric circuit shown in FIG. 2 is switched to the V terminal side, and the power supply by the external power source 25 in the electric circuit shown in FIG. 2 is selected. By repeating the above procedure for all rows, display rewriting of the entire display unit can be performed.
　上記の例では、各画素の状態として、電荷を持つか持たないかの２値のみを考えているが、画素が２値以上の階調で表現されている場合にも、本発明を適用可能である。その場合には、列選択スイッチに電圧調整機を付加する、充電すべき放電状態の画素への電荷の給電時に階調に応じて給電時間を変化させるなどの措置を講じることになる。 In the above example, only the binary state of whether or not there is a charge is considered as the state of each pixel. However, the present invention can also be applied to the case where the pixel is expressed by a gradation of two or more levels. It is. In that case, measures such as adding a voltage regulator to the column selection switch or changing the power supply time according to the gray level when supplying electric charge to the discharged pixel to be charged are taken.
　また、上記の例では、アクティブマトリクス方式により、一行同時に表示の書き換えを行っているが、画素数が少なければ、一画素毎に表示の書き換えを行ってもよい。 In the above example, the display is rewritten simultaneously by the active matrix method. However, if the number of pixels is small, the display may be rewritten for each pixel.
　そして、上記の例では、一行毎に電荷を放出すべき充電状態の画素から２次電池への電荷の移送及び２次電池から電荷を充電すべき放電状態の画素への給電を繰り返しているが、表示部全体についての電荷を放出すべき充電状態の画素から２次電池への電荷の移送を行った後、表示部全体についての２次電池から電荷を充電すべき放電状態の画素への給電を行ってもよい。この場合、電荷を放出すべき充電状態の画素から２次電池へ移送される電荷の量が表示部全体で均されるため、表示部内で表示・非表示の画素に偏りがある場合でも、２次電池に移送された電荷の有効利用が可能な点で有利である。 In the above example, the transfer of the charge from the charged pixel to discharge the charge to the secondary battery and the power supply to the discharged pixel to charge from the secondary battery are repeated for each row. Then, after transferring the charge from the charged pixel for discharging the entire display unit to the secondary battery, the power is supplied to the discharged pixel from the secondary battery for charging the entire display unit. May be performed. In this case, since the amount of charge transferred from the charged pixel to which the charge is to be discharged to the secondary battery is leveled over the entire display unit, even when the display / non-display pixel is biased in the display unit, 2 This is advantageous in that the charge transferred to the secondary battery can be effectively used.
　さらに、上記の例では、電荷を放出すべき充電状態の画素から２次電池への電荷の移送において、図２に示す電気回路中の昇圧回路２３を介した第２の電気配線により２次電池２２に電荷を移送する構成をとっているが、充電状態の画素の電圧より２次電池の電圧が低い場合には、前述のように、第１の電気配線により２次電池２２に電荷を移送し、昇圧回路２３を介した第２の電気配線により２次電池２２から充電すべき放電状態の画素に電荷を給電する構成も可能である。この場合には、図２において、昇圧回路２３の入力端子を、２次電池２２に接続し、昇圧回路２３の出力端子を、セルアレイ２０に接続する。 Furthermore, in the above example, in the transfer of the charge from the charged pixel to which the charge is to be discharged to the secondary battery, the secondary battery is connected by the second electric wiring via the booster circuit 23 in the electric circuit shown in FIG. The charge is transferred to the battery 22, but when the voltage of the secondary battery is lower than the voltage of the charged pixel, the charge is transferred to the secondary battery 22 by the first electric wiring as described above. In addition, a configuration in which electric charges are supplied to the discharged pixels to be charged from the secondary battery 22 by the second electric wiring via the booster circuit 23 is also possible. In this case, in FIG. 2, the input terminal of the booster circuit 23 is connected to the secondary battery 22, and the output terminal of the booster circuit 23 is connected to the cell array 20.
　２次電池の充放電と同様に、２次電池とみなしたときの画素の平衡電位と、表示書き換えの際に画素に与える電位の差が大きいほど、多くの電流を流すことができ、表示書き換え速度は向上する。しかし、前記電位差の分は電力としてのロスとなることから、表示書き換え速度の向上と消費電力の低減は相反する関係にある。どのように表示書き換えを行うかは、目的、表示デバイスの状態に応じて選択することができる。 Similar to the charging / discharging of the secondary battery, the larger the difference between the equilibrium potential of the pixel regarded as the secondary battery and the potential applied to the pixel at the time of display rewriting, the more current can flow. Speed increases. However, since the potential difference becomes a loss of power, there is a contradictory relationship between improvement in display rewriting speed and reduction in power consumption. How to rewrite the display can be selected according to the purpose and the state of the display device.
　また、これまでの例は、ＥＣ表示デバイスに関するものであるが、同様の電気化学デバイスであるＥＤ表示デバイスに関しても、その表示－非表示状態において、セルの端子間電圧が変動し、２次電池とみなせるものである限り、本発明を全く同じように適用することができる。 In addition, the examples so far relate to EC display devices. However, regarding an ED display device which is a similar electrochemical device, the voltage between the terminals of the cell fluctuates in the display-non-display state, and the secondary battery The present invention can be applied in exactly the same way as long as it can be considered.
　本発明の表示デバイスは、例えば、電子ペーパ、電子黒板、電子看板などとして用いることできる。ただし、これらの用途は例示に過ぎず、本発明はこれに限定されない。 The display device of the present invention can be used as, for example, electronic paper, an electronic blackboard, and an electronic signboard. However, these uses are only examples, and the present invention is not limited thereto.
　つぎに、本発明の表示デバイスの作動方法について説明する。本発明の表示デバイスの作動方法は、少なくとも一つの前記画素の電圧が前記蓄電部の電圧より低い場合において、少なくとも一つの前記画素の電荷を減らすとき、前記スイッチ部において、前記第２の電気配線が選択され、少なくとも一つの前記画素の電荷を増やすとき、前記スイッチ部において、前記第１の電気配線が選択され、少なくとも一つの前記画素の電圧が前記蓄電部の電圧より高い場合において、少なくとも一つの前記画素の電荷を減らすとき、前記スイッチ部において、前記第１の電気配線が選択され、少なくとも一つの前記画素の電荷を増やすとき、前記スイッチ部において、前記第２の電気配線が選択されることを特徴とする。本発明の作動方法には、前述の本発明の表示デバイスの説明を引用できる。 Next, an operation method of the display device of the present invention will be described. When the voltage of at least one pixel is lower than the voltage of the power storage unit and the charge of the at least one pixel is reduced, the display device operates according to the present invention. Is selected and the charge of at least one of the pixels is increased, and when the first electrical wiring is selected in the switch unit and the voltage of the at least one pixel is higher than the voltage of the power storage unit, at least one When the charge of one pixel is reduced, the first electrical wiring is selected in the switch unit, and when the charge of at least one of the pixels is increased, the second electrical wiring is selected in the switch unit. It is characterized by that. In the operation method of the present invention, the above description of the display device of the present invention can be cited.
　ＷＯ３をＥＣ材料として用いた５０×５０画素の図３～５に示すＥＣ表示デバイスについて、様々な表示条件で表示の書き換えを行い、消費電力を測定した。図２に示す電気回路を全く使わずに同一条件で表示の書き換えを行った場合と比較することで、消費電力の削減度合いを評価した。その結果を、表１に示す。表１に示すとおり、図２に示す電気回路を全く使わなかった場合と比較して、消費電力が３０～８１％削減された。 With respect to the EC display device shown in FIGS. 3 to 5 having 50 × 50 pixels using WO 3 as an EC material, the display was rewritten under various display conditions, and the power consumption was measured. The degree of reduction in power consumption was evaluated by comparing with the case where the display was rewritten under the same conditions without using the electrical circuit shown in FIG. The results are shown in Table 1. As shown in Table 1, the power consumption was reduced by 30 to 81% compared to the case where the electric circuit shown in FIG. 2 was not used at all.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　上記の実施形態及び実施例の一部又は全部は、以下の付記のようにも記載し得るが、以下には限定されない。 Some or all of the above embodiments and examples may be described as in the following supplementary notes, but are not limited to the following.
（付記１）
電荷が出入りする材料を含む画素を複数備えた表示部と、
少なくとも一つの前記画素から放出される電荷を充放電する蓄電部と、
前記表示部及び前記蓄電部を接続する第１の電気配線と、
昇圧回路を介して前記表示部及び前記蓄電部を接続する第２の電気配線と、
前記第１の電気配線及び前記第２の電気配線のいずれかを選択するスイッチ部と
を含むことを特徴する表示デバイス。 (Appendix 1)
A display unit including a plurality of pixels including a material through which charges come and go;
A power storage unit that charges and discharges electric charges emitted from at least one of the pixels;
First electrical wiring connecting the display unit and the power storage unit;
A second electrical wiring connecting the display unit and the power storage unit via a booster circuit;
A display device comprising: a switch unit that selects one of the first electric wiring and the second electric wiring.
（付記２）
前記昇圧回路の入力端子が、前記表示部に接続され、
前記昇圧回路の出力端子が、前記蓄電部に接続されている
ことを特徴とする付記１記載の表示デバイス。 (Appendix 2)
An input terminal of the booster circuit is connected to the display unit,
The display device according to appendix 1, wherein an output terminal of the booster circuit is connected to the power storage unit.
（付記３）
少なくとも一つの前記画素の電圧が前記蓄電部の電圧より低い場合において、
少なくとも一つの前記画素の電荷を減らすとき、前記スイッチ部において、前記第２の電気配線が選択され、
少なくとも一つの前記画素の電荷を増やすとき、前記スイッチ部において、前記第１の電気配線が選択される
ことを特徴とする付記１又は２記載の表示デバイス。 (Appendix 3)
When the voltage of at least one of the pixels is lower than the voltage of the power storage unit,
When reducing the charge of at least one of the pixels, the second electrical wiring is selected in the switch unit,
The display device according to appendix 1 or 2, wherein when the charge of at least one of the pixels is increased, the first electric wiring is selected in the switch unit.
（付記４）
少なくとも一つの前記画素の電圧が前記蓄電部の電圧より高い場合において、
少なくとも一つの前記画素の電荷を減らすとき、前記スイッチ部において、前記第１の電気配線が選択され、
少なくとも一つの前記画素の電荷を増やすとき、前記スイッチ部において、前記第２の電気配線が選択される
ことを特徴とする付記１記載の表示デバイス。 (Appendix 4)
When the voltage of at least one of the pixels is higher than the voltage of the power storage unit,
When reducing the charge of at least one of the pixels, the first electrical wiring is selected in the switch unit,
The display device according to claim 1, wherein when the charge of at least one of the pixels is increased, the second electrical wiring is selected in the switch unit.
（付記５）
電荷が出入りする材料を含む画素を複数備えた表示部と、
少なくとも一つの前記画素から放出される電荷を充放電する蓄電部と、
前記表示部及び前記蓄電部の間で電荷を移送する充放電手段とを含み、
前記充放電手段が、
少なくとも一つの前記画素の電荷を減らすとき、少なくとも一つの前記画素から放出される電荷を前記蓄電部に充電し、
少なくとも一つの前記画素の電荷を増やすとき、前記蓄電部に充電された電荷を放電する
ことを特徴とする表示デバイス。 (Appendix 5)
A display unit including a plurality of pixels including a material through which charges come and go;
A power storage unit that charges and discharges electric charges emitted from at least one of the pixels;
Charge / discharge means for transferring charge between the display unit and the power storage unit,
The charging / discharging means
When reducing the charge of at least one of the pixels, the charge discharged from the at least one of the pixels is charged into the power storage unit,
A display device, wherein when the charge of at least one of the pixels is increased, the charge charged in the power storage unit is discharged.
（付記６）
前記充放電手段が、スイッチ部を含み、
前記スイッチ部により、前記蓄電部における充電及び放電を選択可能である
ことを特徴とする付記５記載の表示デバイス。 (Appendix 6)
The charging / discharging means includes a switch part,
The display device according to appendix 5, wherein charging and discharging in the power storage unit can be selected by the switch unit.
（付記７）
さらに、外部電源を含み、
前記外部電源により、少なくとも一つの前記画素に給電される
ことを特徴とする付記１から４、又は６のいずれかに記載の表示デバイス。 (Appendix 7)
In addition, including an external power supply,
The display device according to any one of appendices 1 to 4, or 6, wherein power is supplied to at least one of the pixels by the external power source.
（付記８）
前記スイッチ部により、前記外部電源による給電を選択可能である
ことを特徴とする付記７記載の表示デバイス。 (Appendix 8)
The display device according to appendix 7, wherein power supply by the external power source can be selected by the switch unit.
（付記９）
前記スイッチ部において、
少なくとも一つの前記画素の電荷が所定量に満たないとき、前記外部電源による給電が選択される
ことを特徴とする付記８記載の表示デバイス。 (Appendix 9)
In the switch part,
The display device according to appendix 8, wherein power supply by the external power source is selected when the charge of at least one of the pixels is less than a predetermined amount.
（付記１０）
前記画素が、エレクトロクロミック材料を含む
ことを特徴とする付記１から９のいずれかに記載の表示デバイス。 (Appendix 10)
The display device according to any one of appendices 1 to 9, wherein the pixel includes an electrochromic material.
（付記１１）
前記画素が、エレクトロクロミックセルである
ことを特徴とする付記１から１０のいずれかに記載の表示デバイス。 (Appendix 11)
11. The display device according to any one of appendices 1 to 10, wherein the pixel is an electrochromic cell.
（付記１２）
前記表示部が、エレクトロデポジション方式である
ことを特徴とする付記１から９のいずれかに記載の表示デバイス。 (Appendix 12)
The display device according to any one of appendices 1 to 9, wherein the display unit is an electrodeposition system.
（付記１３）
付記１から１２のいずれかに記載の表示デバイスを用いた
ことを特徴とする電子ペーパ。 (Appendix 13)
Electronic paper using the display device according to any one of appendices 1 to 12.
（付記１４）
付記１から１２のいずれかに記載の表示デバイスを用いた
ことを特徴とする電子黒板。 (Appendix 14)
An electronic blackboard using the display device according to any one of appendices 1 to 12.
（付記１５）
付記１から１２のいずれかに記載の表示デバイスを用いた
ことを特徴とする電子看板。 (Appendix 15)
An electronic signboard using the display device according to any one of appendices 1 to 12.
（付記１６）
付記１記載の表示デバイスの作動方法であって、
少なくとも一つの前記画素の電圧が前記蓄電部の電圧より低い場合において、
少なくとも一つの前記画素の電荷を減らすとき、前記スイッチ部において、前記第２の電気配線が選択され、
少なくとも一つの前記画素の電荷を増やすとき、前記スイッチ部において、前記第１の電気配線が選択され、
少なくとも一つの前記画素の電圧が前記蓄電部の電圧より高い場合において、
少なくとも一つの前記画素の電荷を減らすとき、前記スイッチ部において、前記第１の電気配線が選択され、
少なくとも一つの前記画素の電荷を増やすとき、前記スイッチ部において、前記第２の電気配線が選択される
ことを特徴とする作動方法。 (Appendix 16)
An operation method of the display device according to attachment 1, comprising:
When the voltage of at least one of the pixels is lower than the voltage of the power storage unit,
When reducing the charge of at least one of the pixels, the second electrical wiring is selected in the switch unit,
When increasing the charge of at least one of the pixels, the first electrical wiring is selected in the switch unit,
When the voltage of at least one of the pixels is higher than the voltage of the power storage unit,
When reducing the charge of at least one of the pixels, the first electrical wiring is selected in the switch unit,
The method according to claim 1, wherein when the charge of at least one of the pixels is increased, the second electrical wiring is selected in the switch unit.
　以上、実施形態を参照して本願発明を説明したが、本願発明は、上記実施形態に限定されるものではない。本願発明の構成や詳細には、本願発明のスコープ内で当業者が理解しうる様々な変更をすることができる。 As mentioned above, although this invention was demonstrated with reference to embodiment, this invention is not limited to the said embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
　この出願は、２０１１年５月２７日に出願された日本出願特願２０１１－１１９５３４を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims priority based on Japanese Patent Application No. 2011-119534 filed on May 27, 2011, the entire disclosure of which is incorporated herein.
　以上のように、本発明の表示デバイスによれば、消費電力を大幅に削減可能である。本発明の表示デバイスは、例えば、電子ペーパ、電子黒板、電子看板など、幅広い用途に適用可能である。 As described above, according to the display device of the present invention, power consumption can be significantly reduced. The display device of the present invention can be applied to a wide range of applications such as electronic paper, an electronic blackboard, and an electronic signboard.
１０、２０、３０　表示部
１１　画素
１２、２２、３２　蓄電部
２３　昇圧回路
２４　スイッチ部（切り替えスイッチ）
２５　外部電源 10, 20, 30 Display unit 11 Pixel 12, 22, 32 Power storage unit 23 Booster circuit 24 Switch unit (changeover switch)
25 External power supply

Claims (10)

  1. 電荷が出入りする材料を含む画素を複数備えた表示部と、
    少なくとも一つの前記画素から放出される電荷を充放電する蓄電部と、
    前記表示部及び前記蓄電部を接続する第１の電気配線と、
    昇圧回路を介して前記表示部及び前記蓄電部を接続する第２の電気配線と、
    前記第１の電気配線及び前記第２の電気配線のいずれかを選択するスイッチ部と
    を含むことを特徴する表示デバイス。     A display unit including a plurality of pixels including a material through which charges come and go;
    A power storage unit that charges and discharges electric charges emitted from at least one of the pixels;
    First electrical wiring connecting the display unit and the power storage unit;
    A second electrical wiring connecting the display unit and the power storage unit via a booster circuit;
    A display device comprising: a switch unit that selects one of the first electric wiring and the second electric wiring.
  2. 前記昇圧回路の入力端子が、前記表示部に接続され、
    前記昇圧回路の出力端子が、前記蓄電部に接続されている
    ことを特徴とする請求項１記載の表示デバイス。     An input terminal of the booster circuit is connected to the display unit,
    The display device according to claim 1, wherein an output terminal of the booster circuit is connected to the power storage unit.
  3. 少なくとも一つの前記画素の電圧が前記蓄電部の電圧より低い場合において、
    少なくとも一つの前記画素の電荷を減らすとき、前記スイッチ部において、前記第２の電気配線が選択され、
    少なくとも一つの前記画素の電荷を増やすとき、前記スイッチ部において、前記第１の電気配線が選択される
    ことを特徴とする請求項１又は２記載の表示デバイス。     When the voltage of at least one of the pixels is lower than the voltage of the power storage unit,
    When reducing the charge of at least one of the pixels, the second electrical wiring is selected in the switch unit,
    3. The display device according to claim 1, wherein when the charge of at least one of the pixels is increased, the first electric wiring is selected in the switch unit. 4.
  4. 少なくとも一つの前記画素の電圧が前記蓄電部の電圧より高い場合において、
    少なくとも一つの前記画素の電荷を減らすとき、前記スイッチ部において、前記第１の電気配線が選択され、
    少なくとも一つの前記画素の電荷を増やすとき、前記スイッチ部において、前記第２の電気配線が選択される
    ことを特徴とする請求項１記載の表示デバイス。     When the voltage of at least one of the pixels is higher than the voltage of the power storage unit,
    When reducing the charge of at least one of the pixels, the first electrical wiring is selected in the switch unit,
    2. The display device according to claim 1, wherein when the charge of at least one of the pixels is increased, the second electrical wiring is selected in the switch unit.
  5. 電荷が出入りする材料を含む画素を複数備えた表示部と、
    少なくとも一つの前記画素から放出される電荷を充放電する蓄電部と、
    前記表示部及び前記蓄電部の間で電荷を移送する充放電手段とを含み、
    前記充放電手段が、
    少なくとも一つの前記画素の電荷を減らすとき、少なくとも一つの前記画素から放出される電荷を前記蓄電部に充電し、
    少なくとも一つの前記画素の電荷を増やすとき、前記蓄電部に充電された電荷を放電することを特徴とする表示デバイス。     A display unit including a plurality of pixels including a material through which charges come and go;
    A power storage unit that charges and discharges electric charges emitted from at least one of the pixels;
    Charge / discharge means for transferring charge between the display unit and the power storage unit,
    The charging / discharging means
    When reducing the charge of at least one of the pixels, the charge discharged from the at least one of the pixels is charged into the power storage unit,
    A display device, wherein when the charge of at least one of the pixels is increased, the charge charged in the power storage unit is discharged.
  6. 前記充放電手段が、スイッチ部を含み、
    前記スイッチ部により、前記蓄電部における充電及び放電を選択可能である
    ことを特徴とする請求項５記載の表示デバイス。     The charging / discharging means includes a switch part,
    The display device according to claim 5, wherein charging and discharging in the power storage unit can be selected by the switch unit.
  7. さらに、外部電源を含み、
    前記外部電源により、少なくとも一つの前記画素に給電される
    ことを特徴とする請求項１から４、又は６のいずれか一項に記載の表示デバイス。     In addition, including an external power supply,
    The display device according to claim 1, wherein power is supplied to at least one of the pixels by the external power source.
  8. 前記スイッチ部により、前記外部電源による給電を選択可能である
    ことを特徴とする請求項７記載の表示デバイス。     The display device according to claim 7, wherein power supply by the external power source can be selected by the switch unit.
  9. 前記スイッチ部において、
    少なくとも一つの前記画素の電荷が所定量に満たないとき、前記外部電源による給電が選択される
    ことを特徴とする請求項８記載の表示デバイス。     In the switch part,
    The display device according to claim 8, wherein power supply by the external power source is selected when a charge of at least one of the pixels is less than a predetermined amount.
  10. 前記画素が、エレクトロクロミック材料を含む
    ことを特徴とする請求項１から９のいずれか一項に記載の表示デバイス。     The display device according to claim 1, wherein the pixel includes an electrochromic material.
PCT/JP2012/063442 2011-05-27 2012-05-25 Display device WO2012165316A1 (en)

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