WO2010038870A1 - 情報表示用パネルの駆動方法 - Google Patents
情報表示用パネルの駆動方法 Download PDFInfo
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- WO2010038870A1 WO2010038870A1 PCT/JP2009/067256 JP2009067256W WO2010038870A1 WO 2010038870 A1 WO2010038870 A1 WO 2010038870A1 JP 2009067256 W JP2009067256 W JP 2009067256W WO 2010038870 A1 WO2010038870 A1 WO 2010038870A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
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- 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
- G09G2310/0202—Addressing of scan or signal lines
- G09G2310/0218—Addressing of scan or signal lines with collection of electrodes in groups for n-dimensional addressing
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- 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
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- 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
- G09G2330/025—Reduction of instantaneous peaks of current
Definitions
- the present invention relates to an information display panel that encloses a display medium configured as a particle group including a chargeable particle between two substrates, at least one of which is transparent, and moves the display medium to display information such as an image. More particularly, the present invention relates to an efficient driving method for an information display panel.
- a liquid crystal display is widely used as an information display device.
- liquid crystal display devices have drawbacks such as large power consumption and narrow viewing angle. Therefore, as an alternative to a liquid crystal display device, a plurality of cells formed by partition walls are formed between two substrates (for example, glass substrates) at least one of which is transparent, and a particle group including charged particles in the cells.
- a display medium configured as described above is enclosed and an electric field is applied to the display medium to display information such as an image.
- an electrode pair that generates an electric field according to information such as an image is provided in the space between the substrates, and the image group is moved by moving the particle group according to the electric field.
- Display information The displayed information can be viewed through a transparent panel substrate on the display surface side. Then, when erasing the displayed information, predetermined energization is performed on the electrode to generate an electric field in the same direction on the entire screen, and the same type of particle group is moved to the same substrate side.
- Patent Document 1 discloses an information display panel that employs the above technique.
- paragraph [0020] of this document an image displayed using an electrode pair formed by line electrodes facing each other at right angles. It is described that the erasure of the information such as the line erasure may be performed for each line electrode, or the entire screen displaying the information may be erased all at once.
- the erasure of the information such as the line erasure may be performed for each line electrode, or the entire screen displaying the information may be erased all at once.
- the required time becomes long. Therefore, it is desirable to employ batch erasure from the viewpoint of shortening the required time.
- the information display panel is provided with, for example, about 100 to 200 row electrodes (scanning electrodes) as line electrodes on one substrate, and about 300 to 400 column electrodes as line electrodes on the other substrate.
- Data electrode is provided. Then, a voltage is applied between these many line electrodes to generate a predetermined electric field, and information writing or erasing is executed.
- the collective erasure as described above, it is necessary to generate an erasing electric field by applying a voltage of a certain level or more to the entire electrode. Therefore, in an information display panel that employs batch erasure, the peak power at the time of batch erasure becomes high power, but a large power supply device (power supply module) that secures this high power is required.
- the information display panel becomes large and expensive.
- the object of the present invention is to solve the above-mentioned problems in erasing information such as displayed images and the problem in collective erasure, and driving the information display panel efficiently to display information or display the displayed information. It is to propose a method for erasing data, and further to propose a method for driving an information display panel in consideration of display quality.
- the object is to enclose a display medium configured as a particle group including a chargeable particle between two opposing substrates at least one of which is transparent, and to apply an electric field based on electrodes disposed on each of the substrates.
- a method for driving an information display panel that displays information by moving the display medium between the substrates, and when erasing the display, the entire screen for displaying the information is divided into a plurality of sections. This can be achieved by a method for driving an information display panel in which areas are set and batch erasure is executed sequentially for each of the plurality of divided areas.
- the divided areas set by dividing the entire screen may be set so as to include the same number of the electrodes.
- the two substrates include a plurality of row electrodes as the electrodes arranged on the first substrate, and a plurality of column electrodes as the electrodes arranged on the second substrate.
- An electric field is generated every predetermined number of column electrodes to set a first segmented region that is subdivided, and the erasing is performed. Thereafter, an electric field is generated in the remaining column electrodes to subdivide the second segmented region It is more desirable to perform the erasure.
- the first and second divided areas may be set by dividing the entire screen into two equal parts.
- the entire screen (the entire area of information display) is divided into a plurality of divided areas, and a method of collectively erasing each divided area in order is adopted, thereby reducing the power consumption. It is possible to erase the entire screen in a short time compared to the case of erasing line by line while keeping the peak value of the image low compared to the case of batch erasing that has been performed for the entire screen so far. Became. As a result, the information display panel that implements the driving method according to the present invention can reduce the size and cost of the information display panel while executing erasing in a relatively short time.
- (A), (b) is the figure shown in order to demonstrate the fundamental structure of the information display panel used as the object of this invention.
- (A), (b) is the figure shown in order to demonstrate the other fundamental structure of the information display panel used as the object of this invention.
- (A), (b) is the figure shown in order to demonstrate the other fundamental structure of the information display panel used as the object of this invention.
- an electric field is applied to a display medium configured as a particle group including charged particles sealed in a space between two opposing substrates.
- the display medium is attracted by an electric field force or a Coulomb force, and the display medium is moved by a change in the electric field direction, whereby information such as an image is displayed. Therefore, it is necessary to design an information display panel so that the display medium can be moved uniformly and stability can be maintained when the display information is rewritten repeatedly or when the display information is continuously displayed.
- the force applied to the particles constituting the display medium in addition to the force attracting each other by the Coulomb force between the particles, an electric mirror image force between the electrode and the substrate, an intermolecular force, a liquid cross-linking force, gravity and the like can be considered.
- FIGS. 1A and 1B show at least two types of display media having different optical reflectance and charging characteristics, which are configured as a particle group including particles having at least optical reflectance and charging properties.
- a white display medium 3W configured as a particle group including negatively charged white particles 3Wa
- a black display medium 3B configured as a particle group including positively charged black particles 3Ba.
- each cell an electric field generated by applying a voltage between a pair of electrodes formed by an electrode 5 (line electrode) provided on the substrate 1 and an electrode 6 (line electrode) provided on the substrate 2 at an opposite orthogonal intersection. Accordingly, the substrate is moved perpendicularly to the substrates 1 and 2. Then, the white display medium 3W is visually recognized by the observer as shown in FIG. 1A, or the black display medium 3B is visually recognized by the observer as shown in FIG. 1B. In this way, a black and white dot matrix display can be performed.
- the partition in front is abbreviate
- the electrodes 5 and 6 may be provided outside the substrates 1 and 2, inside the substrate, or embedded in the substrate.
- the display medium (here, the white display medium 3W configured as a particle group including the negatively charged white particles 3Wa and the black display medium 3B configured as a particle group including the positively charged black particles 3Ba) is shown by the partition walls 4.
- the white display medium 3W is visually recognized by the observer as shown in FIG. 2A, or the black display medium 3B is visually recognized by the observer as shown in FIG. 2B.
- a black and white dot matrix display can be performed.
- the partition in front is abbreviate
- the electrodes 5 and 6 may be provided outside the substrates 1 and 2, inside the substrate, or embedded in the substrate.
- FIGS. 3A and 3B an example of color display in which a display unit (1 dot) is configured by three cells is shown.
- all the cells 21-1 to 21-3 are filled with the negatively charged white display medium 3W and the positively charged black display medium 3B as display media.
- a red color filter 22R is provided on the observer side of the first cell 21-1
- a green color filter 22G is provided on the observer side of the second cell 21-2
- an observer side of the third cell 21-3 is provided.
- a blue color filter 22B is provided.
- the three cells of the first cell 21-1, the second cell 21-2, and the third cell 21-3 constitute a display unit (1 dot).
- the white display medium when performing color display, the white display medium is moved to the observation side in any one of the first cell 21-1 to the third cell 21-3, and the black display medium is displayed on the observation side. To display red, green, and blue. Then, as shown in FIG. 3A, by moving the white display medium 3W in all of the first cell 21-1 to the third cell 21-3 to the viewer side, white dots are displayed to the viewer. Display. Further, as shown in FIG. 3B, by moving the black display medium 3B in all of the first cell 21-1 to the third cell 21-3 to the viewer side, Display is in progress. In the configuration illustrated in FIGS. 3A and 3B, the front partition is omitted. Multicolor display can be performed by appropriately moving the display medium in each cell.
- a common electrode 6 provided on the observation-side substrate is disposed between the panel substrates 1 and 2 as a display medium with a group of charged white particles and a group of black particles sealed together with an insulating liquid in a microcapsule. Then, black and white dot display is performed by applying an electric field from an electrode pair composed of the pixel electrode 5 with TFT provided on the back side substrate that does not need to be transparent.
- the microcapsule MC is disposed between the substrates, and the pixel electrode 5 with TFT formed on the substrate 1 (back side) and the transparent common electrode (transparent conductive film) 5 formed on the substrate 2 (observation side) are provided.
- the resin that is the main component of the chargeable particles examples include urethane resin, urea resin, acrylic resin, polyester resin, acrylic urethane resin, acrylic urethane silicone resin, acrylic urethane fluororesin, acrylic fluororesin, silicone resin, acrylic silicone resin , Epoxy resin, polystyrene resin, styrene acrylic resin, polyolefin resin, butyral resin, vinylidene chloride resin, melamine resin, phenol resin, fluororesin, polycarbonate resin, polysulfone resin, polyether resin, polyamide resin, etc.
- the above can also be mixed.
- acrylic urethane resin, acrylic silicone resin, acrylic fluororesin, acrylic urethane silicone resin, acrylic urethane fluororesin, fluororesin, and silicone resin are suitable from the viewpoint of controlling the adhesive force with the substrate.
- the charge control agent is not particularly limited.
- the negative charge control agent include salicylic acid metal complexes, metal-containing azo dyes, metal-containing oil-soluble dyes (including metal ions and metal atoms), and quaternary ammonium salt systems. Examples thereof include compounds, calixarene compounds, boron-containing compounds (benzyl acid boron complexes), and nitroimidazole derivatives.
- the positive charge control agent include nigrosine dyes, triphenylmethane compounds, quaternary ammonium salt compounds, polyamine resins, imidazole derivatives, and the like.
- metal oxides such as ultrafine silica, ultrafine titanium oxide, ultrafine alumina, nitrogen-containing cyclic compounds such as pyridine and derivatives and salts thereof, various organic pigments, resins containing fluorine, chlorine, nitrogen, etc. are also charged. It can also be used as a control agent.
- colorant various organic or inorganic pigments and dyes as exemplified below can be used.
- black colorant include carbon black, copper oxide, manganese dioxide, aniline black, activated carbon and the like.
- blue colorants include C.I. I. Pigment blue 15: 3, C.I. I. Pigment Blue 15, Bituminous Blue, Cobalt Blue, Alkaline Blue Lake, Victoria Blue Lake, Phthalocyanine Blue, Metal-free Phthalocyanine Blue, Phthalocyanine Blue Partial Chlorides, Fast Sky Blue, Indanthrene Blue BC, and the like.
- red colorants include bengara, cadmium red, red lead, mercury sulfide, cadmium, permanent red 4R, resol red, pyrazolone red, watching red, calcium salt, lake red D, brilliant carmine 6B, eosin lake, rhodamine lake B, Alizarin Lake, Brilliant Carmine 3B, C.I. I. Pigment Red 2 etc.
- Yellow colorants include yellow lead, zinc yellow, cadmium yellow, yellow iron oxide, mineral first yellow, nickel titanium yellow, navel yellow, naphthol yellow S, Hansa yellow G, Hansa yellow 10G, benzidine yellow G, and benzidine yellow.
- GR Quinoline Yellow Lake, Permanent Yellow NCG, Tartrazine Lake, C.I. I. Pigment Yellow 12 etc.
- green colorants include chrome green, chromium oxide, pigment green B, C.I. I. Pigment Green 7, Malachite Green Lake, Final Yellow Green G, etc.
- orange colorant examples include red chrome yellow, molybdenum orange, permanent orange GTR, pyrazolone orange, Vulcan orange, indanthrene brilliant orange RK, benzidine orange G, indanthrene brilliant orange GK, C.I. I. Pigment Orange 31 etc.
- purple colorants include manganese purple, first violet B, and methyl violet lake.
- white colorants include zinc white, titanium oxide, antimony white, and zinc sulfide.
- extender pigments examples include barite powder, barium carbonate, clay, silica, white carbon, talc, and alumina white.
- various dyes such as basic, acidic, disperse, and direct dyes include nigrosine, methylene blue, rose bengal, quinoline yellow, and ultramarine blue.
- inorganic additives include titanium oxide, zinc white, zinc sulfide, antimony oxide, calcium carbonate, lead white, talc, silica, calcium silicate, alumina white, cadmium yellow, cadmium red, cadmium orange, titanium yellow, Examples include bitumen, ultramarine blue, cobalt blue, cobalt green, cobalt violet, iron oxide, carbon black, manganese ferrite black, cobalt ferrite black, copper powder, and aluminum powder. These pigments and inorganic additives can be used alone or in combination. Of these, carbon black is particularly preferable as the black pigment, and titanium oxide is preferable as the white pigment. The above colorant can be blended to produce chargeable particles of a desired color.
- the chargeable particles have a mean particle diameter d (0.5) in the range of 1 to 20 ⁇ m and are uniform and uniform. If the average particle diameter d (0.5) is larger than this range, the display is not clear. If the average particle diameter d (0.5) is smaller than this range, the cohesive force between the particles becomes too large, which hinders movement as a display medium.
- the particle size distribution of each chargeable particle it is desirable that the particle size distribution Span (span) represented by the following formula is less than 5, preferably less than 3.
- Span (d (0.9) ⁇ d (0.1)) / d (0.5) (However, d (0.5) is a numerical value expressing the particle diameter in ⁇ m that 50% of the particles are larger than this and 50% is smaller than this, and d (0.1) is a particle in which the ratio of the smaller particles is 10%.
- the ratio of the average particle diameter d (0.5) of the particle group having the minimum average particle diameter to the average particle diameter d (0.5) of the particle group having the maximum average particle diameter among the plurality of particle groups is 10 or less. Is important. Even if the particle size distribution span is reduced, display media with different charging characteristics move in opposite directions, so the particle sizes constituting each other display media are made the same size, and the display media can be easily moved in opposite directions. It is preferable to be able to move, and this is the range.
- the particle size distribution and the particle size can be obtained from a laser diffraction / scattering method or the like.
- a light intensity distribution pattern of diffracted / scattered light is spatially generated, and since this light intensity pattern has a corresponding relationship with the particle diameter, the particle diameter and particle diameter distribution can be measured.
- the particle size and particle size distribution in the present invention are obtained from a volume-based distribution. For example, using a Mastersizer2000 (Malvern Instruments Ltd.) measuring instrument, put particles into a nitrogen stream and use the attached analysis software (software based on volume-based distribution using Mie theory) to measure the particle size and particle size. A diameter distribution can be measured.
- the relative humidity at 25 ° C. is 60% RH or less, preferably 50% RH or less with respect to the humidity of the gas in the void portion.
- This gap portion refers to the electrodes 5 and 6 (when the electrodes are provided inside the substrate) from the portion sandwiched between the opposing substrate 1 and substrate 2 in FIGS. 1 (a) and (b) to FIG.
- a gas portion in contact with a so-called display medium excluding an occupied portion of the display medium, an occupied portion of the partition wall 4 and a seal portion of the information display panel is meant.
- the gas in the gap is not limited as long as it is in the humidity region described above, but dry air, dry nitrogen, dry argon, dry helium, dry carbon dioxide, dry methane, and the like are preferable.
- This gas needs to be sealed in an information display panel so that the humidity is maintained, for example, filling a display medium, assembling an information display panel, etc. in a predetermined humidity environment, It is important to apply a sealing material and a sealing method that prevent moisture from entering from the outside.
- the distance between the substrates in the information display panel to which the present invention is applied is only required to be able to move the display medium and maintain the contrast, but is usually adjusted to 10 to 500 ⁇ m, preferably 10 to 200 ⁇ m.
- the thickness is adjusted to 10 to 100 ⁇ m, preferably 10 to 50 ⁇ m.
- the volume occupation ratio of the display medium in the gas space between the opposing substrates is preferably 5 to 70%, more preferably 5 to 60%. Note that if it exceeds 70%, the movement of the display medium is hindered, and if it is less than 5%, the contrast tends to be unclear.
- An information display panel adopting the driving method according to the present invention includes a notebook computer, an electronic notebook, a portable information device called PDA (Personal Digital Assistants), a display unit of a mobile device such as a mobile phone and a handy terminal, an electronic book, Electronic paper such as electronic newspapers, electronic manuals (electronic instruction manuals), signboards, posters, bulletin boards such as blackboards and whiteboards, electronic desk calculators, display units for home appliances, automotive supplies, etc.
- PDA Personal Digital Assistants
- Cards such as point cards and IC cards Display unit, electronic advertisement, information board, electronic POP (Point Of Presence, Point Of Purchase advertising), electronic price tag, electronic shelf label, electronic score, display unit of RF-ID equipment, POS terminal, car navigation device, watch It is used suitably for the display part of various electronic devices. In addition, it is also suitably used as a rewritable paper that is connected to an external display rewriting means and performs display rewriting.
- a driving method for the information display panel a passive driving method in which no switching element is used in the panel itself or an active driving method in which TFTs are used as switching elements can be applied.
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Abstract
Description
ここで、上記したような一括消去を実行しよとする場合には、電極全体に一定以上の電圧を印加して、消去用の電界を発生させることが必要となる。よって、一括消去を採用する情報表示用パネルでは、一括消去時のピーク電力は大電力となるが、この大電力を確保した大型の電力供給装置(電力供給モジュール)が必要となる。そのために、情報表示用パネルが大型化してしまい高コストなものになってしまう。
また、当然のこととして、上記の消去処理は不要な画像などが残存することがないよう確実に実行することが望まれる。消去操作が不適切であると、その後の表示品位に影響を与えることになる。
図1(a)、(b)に示す例は、少なくとも光学的反射率および帯電性を有する粒子を含んだ粒子群として構成される互いに光学的反射率および帯電特性が異なる少なくとも2種類の表示媒体(ここでは負帯電性白色粒子3Waを含んだ粒子群として構成した白色表示媒体3Wと正帯電性黒色粒子3Baを含んだ粒子群として構成した黒色表示媒体3Bを示す)を、隔壁4で形成された各セルにおいて、基板1に設けた電極5(ライン電極)と基板2に設けた電極6(ライン電極)とが対向直交交差に形成する電極対の間に電圧を印加することにより発生する電界に応じて、基板1、2と垂直に移動させる。そして、図1(a)に示すように白色表示媒体3Wを観察者に視認させて白色表示したり、あるいは、図1(b)に示すように黒色表示媒体3Bを観察者に視認させて黒色表示したりするようにして、白黒のドットマトリックス表示を行うことができる。
なお、図1(a)、(b)においては、手前にある隔壁は省略している。各電極5、6は、基板1、2の外側に設けても、基板の内側に設けても、基板内部に埋め込むように設けてもよい。
なお、図2(a)、(b)において、手前にある隔壁は省略している。各電極5、6は、基板1、2の外側に設けても、基板の内側に設けても、基板内部に埋め込むように設けてもよい。
本例では、カラー表示を行う際には、第1セル21-1~第3のセル21-3のいずれかで、観察側に白色表示媒体を移動させると共に他で、観察側に黒色表示媒体を移動させて赤色、緑色、青色の表示を行う。そして、図3(a)に示すように、観察者側に、第1セル21-1~第3のセル21-3の全てにおいて白色表示媒体3Wを移動することで、観察者に対し白色ドット表示を行う。さらに、図3(b)に示すように、観察者側に、第1セル21-1~第3のセル21-3の全てにおいて黒色表示媒体3Bを移動することで、観察者に対し黒色ドット表示を行っている。なお、この図3(a)、(b)に例示の構成でも、手前にある隔壁は省略している。各セル内での表示媒体の移動を適宜に行って多色カラー表示を行うことができる。
情報を表示させる際には、列電極6-1~6-8と行電極5-1~5-6との間に表示させる情報に応じた電圧を印加することにより電界を発生させて対応する画素(ドット)にある表示媒体を移動させて白黒ドットによって情報を表示する。
なお、図6では全画面ALを2つの区分領域とする2分割の場合を例示しているが、更には3分割以上としてもよい。この場合、分割数を増加させて区分領域DAの数を増やす程、消去時に必要な電力ピークを低く抑えることができ、これにより必要とする電力供給モジュールの小型化を図ることができる。ただし、この場合には消去のための所要時間が増加するので、この点についての総合的に判断することが必要となる。
また、コントラストとは情報表示用パネル上での白と黒の対比であり、ここでは画像の反射濃度をGretagmacbeth社製の濃度計RD-19を用いてコントラストを測定した。ここでいうコントラストはコントラスト比のことであり、濃度計で測定した黒反射濃度B、白反射濃度Wによりコントラスト比=10(B-W)で求められる値である。
視認側(表示面側)基板の情報表示画面領域に設ける電極は透明である必要があるが、背面側基板に設ける電極は透明である必要がない。いずれの場合もパターン形成可能である導電性である上記材料を好適に用いることができる。なお、電極厚みは、導電性が確保でき光透過性に支障がなければ良く、0.01~10μm、好ましくは0.05~5μmが好適である。背面側基板に設ける電極の材質や厚みなどは上述した表示面側基板に設ける電極と同様であるが、透明である必要はない。
これらのリブからなる隔壁により形成されるセルは、図8に示すごとく、基板平面方向からみて四角状、三角状、ライン状、円形状、六角状が例示され、配置としては格子状やハニカム状や網目状が例示される。表示面側から見える隔壁断面部分に相当する部分(セルの枠部の面積)はできるだけ小さくした方がよく、表示状態の鮮明さを増すことができる。
ここで、隔壁の形成方法を例示すると、金型転写法、スクリーン印刷法、サンドブラスト法、フォトリソ法、アディティブ法が挙げられる。いずれの方法もこの発明の情報表示装置に搭載する情報表示用パネルに好適に用いることができるが、これらのうち、レジストフィルムを用いるフォトリソ法や金型転写法を好適に用いられる。
これらの顔料および無機系添加剤は、単独であるいは複数組み合わせて用いることができる。このうち特に黒色顔料としてカーボンブラックが、白色顔料として酸化チタンが好ましい。上記着色剤を配合して所望の色の帯電性粒子を作製できる。
Span=(d(0.9)-d(0.1))/d(0.5)
(但し、d(0.5)は粒子の50%がこれより大きく、50%がこれより小さいという粒子径をμmで表した数値、d(0.1)はこれ以下の粒子の比率が10%である粒子径をμmで表した数値、d(0.9)はこれ以下の粒子が90%である粒子径をμmで表した数値である。)
Spanを5以下の範囲に納めることにより、各粒子のサイズが揃い、均一な表示媒体としての移動が可能となる。
ここで、本発明における粒子径および粒子径分布は、体積基準分布から得られたものである。例えば、Mastersizer2000(Malvern Instruments Ltd.)測定機を用いて、窒素気流中に粒子を投入し、付属の解析ソフト(Mie理論を用いた体積基準分布を基本としたソフト)にて、粒子径および粒子径分布の測定を行うことができる。
この空隙部分とは、上記図1(a)、(b)~図3において、対向する基板1、基板2に挟まれる部分から、電極5、6(電極を基板の内側に設けた場合)、表示媒体の占有部分、隔壁4の占有部分、情報表示用パネルのシール部分を除いた、いわゆる表示媒体が接する気体部分を指すものとする。空隙部分の気体は、先に述べた湿度領域であれば、その種類は問わないが、乾燥空気、乾燥窒素、乾燥アルゴン、乾燥ヘリウム、乾燥二酸化炭素、乾燥メタンなどが好適である。この気体は、その湿度が保持されるように情報表示用パネルに封入することが必要であり、例えば、表示媒体の充填、情報表示用パネルの組み立てなどを所定湿度環境下にて行い、さらに、外からの湿分進入を防ぐシール材、シール方法を施すことが肝要である。
対向する基板間の気体中空間における表示媒体の体積占有率は5~70%が好ましく、さらに好ましくは5~60%である。なお、70%を超える場合には表示媒体の移動に支障をきたし、5%未満の場合にはコントラストが不明確となり易い。
なお、情報表示用パネルの駆動方式については、パネル自体にスイッチング素子を用いないパッシブ駆動方式やTFTをスイッチング素子としたアクティブ駆動方式が適用できる。
Claims (4)
- 少なくとも一方が透明な対向する2枚の基板間に、帯電性粒子を含んだ粒子群として構成した表示媒体を封入し、前記基板のそれぞれに配置した電極に基づいて付与する電界に応じて前記表示媒体を前記基板間で移動させて情報を表示する情報表示用パネルの駆動方法であって、
表示の消去をするときに、前記情報を表示する全画面を分割して複数の区分領域を設定し、当該複数の区分領域毎に順に一括消去を実行する、ことを特徴とする情報表示用パネルの駆動方法。 - 前記全画面を分割して設定する前記区分領域は、前記電極を同数含むように設定してある、ことを特徴とする請求項1に記載の情報表示用パネルの駆動方法。
- 前記2枚の基板は、第1の基板に配置した前記電極として複数の行電極を含むと共に、第2の基板に配置した前記電極として複数の列電極を含んで形成されており、
前記列電極の所定本数おきに電界を発生させ細分化した第1の区分領域を設定して前記消去を実行し、その後に残りの列電極に電界を発生させ細分化した第2の区分領域で前記消去を実行する、ことを特徴とする請求項1または2に記載の情報表示用パネルの駆動方法。 - 前記全画面を2等分にして、第1、第2の区分領域を設定してある、ことを特徴とする請求項3に記載の情報表示用パネルの駆動方法。
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CN2009801485914A CN102239515A (zh) | 2008-10-02 | 2009-10-02 | 信息显示用面板的驱动方法 |
JP2010531929A JPWO2010038870A1 (ja) | 2008-10-02 | 2009-10-02 | 情報表示用パネルの駆動方法 |
EP09817902A EP2341496A4 (en) | 2008-10-02 | 2009-10-02 | METHOD FOR CONTROLLING AN INFORMATION DISPLAY SCREEN |
US13/122,234 US20110181564A1 (en) | 2008-10-02 | 2009-10-02 | Method of driving information display panel |
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JP2003329997A (ja) * | 2002-05-15 | 2003-11-19 | Hitachi Displays Ltd | 液晶表示装置 |
JP2005266163A (ja) * | 2004-03-17 | 2005-09-29 | Seiko Epson Corp | 液晶表示装置 |
JP2005331904A (ja) | 2004-04-21 | 2005-12-02 | Bridgestone Corp | 画像表示装置の駆動方法 |
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CN100487781C (zh) * | 2004-04-21 | 2009-05-13 | 株式会社普利司通 | 信息显示装置的驱动方法 |
US7973740B2 (en) * | 2004-04-21 | 2011-07-05 | Bridgestone Corporation | Method of driving information display device |
JP2006047848A (ja) * | 2004-08-06 | 2006-02-16 | Toshiba Matsushita Display Technology Co Ltd | ゲート線駆動回路 |
EP1865366A4 (en) * | 2005-03-28 | 2011-05-18 | Fujitsu Ltd | METHOD FOR EXCITATION OF A LIQUID CRYSTAL DISPLAY ELEMENT |
JP2007328329A (ja) * | 2006-05-10 | 2007-12-20 | Bridgestone Corp | 表示媒体用粒子およびそれを用いた情報表示用パネル |
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