JP2013117609A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly display an image having high quality with low power consumption.SOLUTION: In a display device, a control unit 600 performs such control that potential V1 (V1>V2 and V1>V3) is outputted from a selective display potential output circuit 410 in a first period P1 out of two periods into which a period of power supply for display between a counter electrode 20 forming a selected pixel 60a and a display electrode 40 forming the selected pixel 60a is divided, and potential V5 (V5<V3) is outputted from the selective display potential output circuit 410 is outputted in a second period P2, and lengths of the first period P1 and the second periods P2 and the potential V1, V3 and V5 are set to such values that charges stored between the display electrode 40 forming the selected pixel 60a and the counter electrode 20 forming a non-selected pixel 60b in the first period P1 are substantially removed in the second period P2. The non-selected counter potential output circuit 220 is connected to the counter electrode 20 via a resistor 220a.

Description

  The present invention relates to a display device.

  With the spread of electronic information networks, publishing in the form of electronic books, that is, electronic publishing, has been actively performed in place of books by conventional printing technology. For example, a CRT (Cathode Ray Tube) display or a backlight type liquid crystal display is used as a device for displaying electronic information distributed through such a network. However, the display using these displays has a limited reading place and is inferior in terms of handling, weight, size, shape, and portability as compared with a conventional display printed on paper. In addition, since these displays consume a large amount of power, the display time is limited if driven by a battery. Further, these displays are all light-emitting displays, and there is a problem that high-level fatigue may be caused when staring for a long time.

  Therefore, a display device that can solve the above-described problems and a rewritable display device are desired. As such a display device, a so-called paper-like display or electronic paper has been proposed. Specifically, for example, reflective liquid crystal display devices, electrophoretic display devices, display devices that rotate dichroic particles with an electric field, and electrochromic display devices have been proposed. ing.

  By the way, in an electrochromic display device (electrochromic display device), an image is displayed by energization for developing a selected pixel (selected pixel) (specifically, a line electrode that forms the selected pixel (opposing) Electrode) is applied with a negative voltage, and a positive voltage is applied to the data electrode (display electrode) forming the selected pixel), and the displayed image is erased in the direction opposite to the energization for coloring the selected pixel. This is performed by energization (specifically, applying a positive voltage to the counter electrode and a negative voltage to the display electrode).

  However, since the space between the electrodes is filled with the electrolyte solution, the electrodes for forming the selected pixel are polarized by the energization for coloring the selected pixel, resulting in a state like an electrolytic capacitor or a battery. That is, after energization for causing the selected pixel to develop color, electric charge remains between the electrodes forming the selected pixel. This electric charge moves to the periphery via the electrolyte solution and also moves between the electrodes forming the non-selected pixels. Therefore, for example, when one image is repeatedly displayed by performing a high-speed scan, the next energization is performed before the remaining charge disappears, so that charge is accumulated between the electrodes forming the non-selected pixels, There is a problem that a non-selected pixel is colored and an unclear image in which the selected pixel is blurred is displayed. Therefore, in order to prevent the movement of the remaining charge, it is conceivable to form a partition for separating the pixels between the pixels. For the formation of the partition, the accuracy and precision of alignment and the like are considered. Is required, and the burden on production is large.

Therefore, for example, as shown in FIG. 13A, the counter electrode forming the selected pixel is a negative electrode, the display electrode forming the selected pixel is a positive electrode, and a voltage of a first potential difference is applied between the electrodes. Immediately thereafter, a method has been proposed in which the counter electrode is a positive electrode and the display electrode is a negative electrode, and an application process is performed to apply a voltage of a second potential difference equal to or greater than the first potential difference between the electrodes (for example, , See Patent Document 1).
That is, immediately after the energization for coloring the selected pixel, the energization is performed in the opposite direction to the energization, and the charge generated between the electrodes forming the selected pixel is eliminated (removed), so that no charge remains. I am doing so. Therefore, the non-selected pixels are not colored due to the remaining charge, and a high-quality image can be displayed even when a high-speed scan of about 8 msec / line is performed.

JP 2010-261983 A

However, in Patent Document 1, since the potentials of the counter electrode and the display electrode that form the non-selected pixel are not controlled, the potentials of the counter electrode and the display electrode that form the non-selected pixel change according to the image to be displayed. To do. A voltage is applied between the electrode forming the selected pixel and the electrode forming the non-selected pixel in accordance with the voltage application of the first potential difference between the counter electrode forming the selected pixel and the display electrode ( 13B shows the voltage applied between the display electrode forming the selected pixel and the counter electrode forming the non-selected pixel.), The counter electrode forming the non-selected pixel If the potential of the display electrode changes depending on the displayed image or the like, the charge generated between the electrode forming the selected pixel and the electrode forming the non-selected pixel may not be sufficiently removed.
In particular, since the counter electrode is selected in the order of the first row → second row → third row →..., The same counter electrode is not continuously selected. On the other hand, for example, when the counter electrode in the first row is selected, the display electrode that forms the pixel to be colored in the first row is selected and the counter electrode in the second row is selected. Since the display electrodes that form the pixels to be colored in the second row are selected, the same display electrodes may be selected continuously. For this reason, charges are likely to remain between the display electrode forming the selected pixel and the counter electrode forming the non-selected pixel, and a high-speed scan of about 1 msec / line can be performed even using the method described in Patent Document 1. When it did, it turned out that the low quality image with which the linear blur along a display electrode is conspicuous may be displayed.

  An object of the present invention is to display a high-quality image at high speed and with low power consumption in a display device including an electrochromic display device driven by a passive matrix.

In order to solve the above-mentioned problem, the invention described in claim 1
A first substrate, a counter electrode provided on an upper surface of the first substrate, a second substrate formed above the first substrate and facing the first substrate, and formed of a transparent material; A display electrode provided on the lower surface of the second substrate, at least a part of which is formed of a transparent electrode material, and an electrochromic composition layer provided between the first substrate and the second substrate. The display is performed by energization between the counter electrode and the display electrode, and the display is erased by energization in a direction opposite to the energization for the display between the counter electrode and the display electrode. In a display device comprising a passive matrix driven electrochromic display device,
The counter electrode is a plurality of electrodes extending in parallel,
The display electrode is a plurality of electrodes extending in parallel in a direction orthogonal to the counter electrode,
A pixel is formed in a region where the counter electrode and the display electrode intersect three-dimensionally,
A non-selection display potential output means connected to the display electrode forming the non-selection pixel and outputting a potential V2,
A non-selective counter potential output means connected to the counter electrode forming a non-selected pixel and outputting a potential V3;
Selection display potential output means connected to the display electrode forming the selection pixel and outputting a predetermined potential;
A selective counter potential output means connected to the counter electrode forming the selected pixel and outputting a potential V4 (V4 <V3);
Display control means for displaying a predetermined image on the electrochromic display device,
The display control means includes
A period in which energization for the display is performed between the counter electrode forming the selected pixel and the display electrode forming the selected pixel is divided into two periods, and the selection display is performed in the first first period. The potential V1 (V1> V2, V1> V3) is controlled to be output from the potential output means, and the potential V5 (V5 <V3) is output from the selection display potential output means in the next second period. Control and
The length of the first period and the length of the second period, and the potential V1, the potential V3, and the potential V5 form the display electrode and the non-selected pixel that form the selected pixel in the first period. The charge accumulated between the counter electrode is set to a value that is substantially eliminated in the second period,
The non-selective counter potential output means is connected to the counter electrode through a resistor.

The invention described in claim 2
The display device according to claim 1,
The non-selection display potential output means is connected to the display electrode through a resistor.

The invention according to claim 3
The display device according to claim 1 or 2,
The length of the second period is set to be substantially the same as the length of the first period,
The difference | V5-V3 | between the potential V5 and the potential V3 is set larger than the difference | V1-V3 | between the potential V1 and the potential V3.

The invention according to claim 4
The display device according to any one of claims 1 to 3,
The potential V5 is set to satisfy V5 ≧ V4.

The invention described in claim 5
In the display device according to any one of claims 1 to 4,
The potential V2 is set to satisfy V2 <0,
The potential V3 is set to satisfy V3> 0.

According to the present invention, the charge accumulated in the first period between the display electrode forming the selected pixel and the counter electrode forming the non-selected pixel can be almost removed by energization in the second period. Therefore, it is possible to prevent the charge from remaining. As a result, it is possible to suppress bleeding of the image, and a high-quality image can be displayed.
In addition, since the non-selective counter potential output means is connected to the counter electrode that forms the non-selected pixel via a resistor, the display electrode that forms the selected pixel and the counter electrode that forms the non-selected pixel with respect to the color of the selected pixel It is possible to suppress the influence of decoloring energization in non-selected pixels formed by the above. As a result, the color development speed can be improved, and an image (image having a color density desired by the user) can be displayed at a high speed. Furthermore, since the current is limited by adding a resistor, the power consumption of the electrochromic display device can be reduced.

It is a block diagram which shows the functional structure of the display apparatus of one Embodiment to which this invention is applied. It is a figure which shows typically an example of the electrochromic display device with which the display apparatus of FIG. 1 is provided, (a) is a top view, (b) is sectional drawing. It is sectional drawing which shows typically another example of the electrochromic display device with which the display apparatus of FIG. 1 is provided. It is a figure which shows an example of the circuit structure of the 1st voltage switching part with which the display apparatus of FIG. 1 is provided. It is a figure which shows an example of the circuit structure of the 2nd voltage switching part with which the display apparatus of FIG. 1 is provided. It is a figure for demonstrating a selection pixel and a non-selection pixel. It is a figure which shows an example of the electric potential distribution of the display electrode which forms a selection pixel, and the counter electrode which forms a selection pixel, and the electric potential difference between these electrodes. It is a figure which shows an example of the potential distribution of the display electrode which forms a selection pixel, and the counter electrode which forms a non-selection pixel, and the potential difference between these electrodes. It is a figure which shows an example of the electrical potential distribution of the display electrode which forms a non-selection pixel, and the counter electrode which forms a selection pixel, and the electrical potential difference between these electrodes. It is a figure which shows an example of the potential distribution of the display electrode which forms a non-selection pixel, and the counter electrode which forms a non-selection pixel, and the potential difference between these electrodes. (A) is a figure which shows the result of an Example, (b) is a figure which shows the result of a comparative example. It is a figure which shows the result of an Example and a comparative example. It is a figure for demonstrating the method of the voltage application with respect to the conventional electrochromic display device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

(Display device)
The display apparatus 1000 includes the electrochromic display device 100 and performs a given display process according to image data input from the outside.
Specifically, for example, as shown in FIG. 1, the display device 1000 includes an electrochromic display device 100, a first voltage switching unit 200, a counter electrode selection unit 300, a second voltage switching unit 400, and the like. The display electrode selection unit 500 and the control unit 600 are provided.

(Electrochromic display device)
The electrochromic display device 100 includes, for example, as shown in FIGS. 2A and 2B, a first substrate 10, counter electrodes 20 provided on the upper surface of the first substrate 10, and the first substrate 10. Provided between the first substrate 10 and the second substrate 30, the second substrate 30 provided above the first substrate 10, the display electrodes 40 provided on the lower surface of the second substrate 30, and the second substrate 30. In addition, the display device is driven by a passive matrix and includes the electrochromic composition layer 50.
The electrochromic display device 100 performs display by energization between the counter electrodes 20 and the display electrodes 40 and is opposite to the energization for the display between the counter electrodes 20 and the display electrodes 40. The display is erased by energizing the direction.
The counter electrodes 20 are, for example, a plurality of electrodes extending in parallel with each other. The display electrodes 40 are, for example, transparent display electrodes made up of a plurality of transparent electrodes extending in parallel with each other in a direction orthogonal to the counter electrodes 20. Pixels 60 are formed in a region where the counter electrodes 20 and the display electrodes 40 intersect three-dimensionally.

  The first substrate 10 is formed in a planar shape, for example, and has a function as a base of the electrochromic display device 100.

  The material of the first substrate 10 is not particularly limited as long as it is electrically insulating, and for example, glass or plastic can be used. Examples of the glass include soda lime glass, low alkali / borosilicate glass, alkali-free / borosilicate glass, alkali-free / aluminosilicate glass, and quartz glass. Examples of the plastic include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyamides, polycarbonates, fluoropolymers such as polyvinylidene fluoride, polyethers, polyolefins such as polystyrene and polyethylene, and polyimides. Can be mentioned.

  The first substrate 10 preferably appears white. Therefore, when the material of the first substrate 10 is glass or plastic, for example, the first substrate 10 that looks white can be formed by blending a white pigment such as titanium dioxide, barium sulfate, or kaolin. Moreover, the 1st board | substrate 10 which looks white can be formed by apply | coating the said white pigment on the lower surface of a transparent substrate, or arrange | positioning white sheets, such as white paper and a white PET sheet.

The counter electrodes 20 are formed in, for example, a line shape having a width, and are provided in stripes at equal intervals parallel to each other.
The counter electrodes 20 are provided on the upper surface of the first substrate 10 so as to be in contact with the electrochromic composition layer 50 and to sandwich the electrochromic composition layer 50 so as to face the display electrodes 40.
The counter electrodes 20 are paired with the display electrodes 40 and have a function of energizing the electrochromic composition layer 50.
The counter electrodes 20 ... are three-dimensionally crossed with the display electrodes 40, i.e., have an interval, and form a pixel 60 in the area of the intersection.

The counter electrode 20 may be a transparent electrode or an opaque electrode as long as the surface is oxidized, or a conductor and is electrochemically stable such as corrosion resistance. There is no particular limitation. Specifically, as the counter electrode 20, for example, an ITO thin film, a thin film coated with an oxide film such as SnO ₂ or InO ₂ , an ITO thin film doped with Sn or Sb, an oxide film such as SnO ₂ or InO ₂ Examples of the thin film coated with Sn or Sb, zinc oxide thin film, magnesium oxide thin film, aluminum oxide thin film, chromium oxide thin film, nickel oxide thin film, titanium oxide thin film, gold thin film, platinum thin film, carbon thin film, etc. it can. Further, a surface oxide thin film and the corrosion-resistant conductor may be used in combination, such as coating an ITO thin film on an electrochemically stable conductive thin film such as a gold thin film.

  The second substrate 30 is a transparent substrate formed in a planar shape, for example, and has a function as a support for the display electrodes 40.

  The material of the second substrate 30 is not particularly limited as long as it is an electrically insulating transparent substrate. For example, glass or plastic can be used. Examples of the glass include soda lime glass, low alkali / borosilicate glass, alkali-free / borosilicate glass, alkali-free / aluminosilicate glass, and quartz glass. Examples of the plastic include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyamides, polycarbonates, fluoropolymers such as polyvinylidene fluoride, polyethers, polyolefins such as polystyrene and polyethylene, and polyimides. Can be mentioned.

The display electrodes 40 are, for example, transparent electrodes formed in a line shape having a width, and are provided in stripes at equal intervals parallel to each other.
The display electrodes 40 are provided on the lower surface of the second substrate 30 so as to be in contact with the electrochromic composition layer 50 and so as to sandwich the electrochromic composition layer 50 facing the counter electrode 20.
The display electrodes 40 are paired with the counter electrodes 20 and have a function of energizing the electrochromic composition layer 50.
The display electrodes 40 intersect with the counter electrodes 20 three-dimensionally, that is, with an interval, and form a pixel 60 in the area of the intersection.

The display electrode 40 is not particularly limited as long as it is a transparent electrode having at least a surface oxidized. Specifically, as the display electrode 40, for example, an ITO thin film, a thin film coated with an oxide film such as SnO ₂ or InO ₂ , an ITO thin film doped with Sn or Sb, an oxide film such as SnO ₂ or InO ₂ Examples thereof include a thin film coated with Sn and Sb, a zinc oxide thin film, and a magnesium oxide thin film. Further, it may be a thin film coated with an oxide film such as ITO, zinc oxide, magnesium oxide, aluminum oxide, chromium oxide, nickel oxide, and titanium oxide.

The electrochromic composition layer 50 includes, for example, a spacer 51, an electrochromic composition 52 held by the spacer 51, and the like.
The thickness of the electrochromic composition layer 50 is not particularly limited, but the display function of the electrochromic composition 52 is effectively expressed by setting the thickness to preferably 10 μm to 500 μm, more preferably 30 μm to 200 μm. Can be made.

  The spacer 51 has a role of holding the electrochromic composition 52 with a constant volume between the first substrate 10 and the second substrate 30. That is, the spacer 51 includes the electrochromic composition 52 to support the electrochromic composition 52 between the first substrate 10 and the second substrate 30, and the electrochromic composition 52 has a thickness depending on the thickness of the spacer 51. It has a role to control the amount uniformly.

  The spacer 51 is arbitrary as long as it plays the above-described role, and for example, a porous plate-like body, a sheet-like body, a granular body (which may be porous or non-porous), etc. Is mentioned.

When the spacer 51 is a porous plate-like body or sheet-like body, for example, the electrochromic composition layer 50 is formed by introducing the electrochromic composition 52 into the pores of the spacer 51. In this case, after the spacer 51 is sandwiched between the counter electrode 20 (the first substrate 10 on which the counter electrode 20 is disposed) and the display electrode 40 (the second substrate 30 on which the display electrode 40 is disposed), The electrochromic composition 52 may be formed by introducing the electrochromic composition 52 into the pores of the spacer 51, or the electrochromic composition 52 may be introduced into the pores of the spacer 51. After the layer 50 is formed, the electrochromic composition layer 50 may be sandwiched between the counter electrodes 20 and the display electrodes 40.
Here, as a porous plate-like body or sheet-like body, pores penetrating in a substantially vertical direction with respect to the first substrate 10 and the second substrate 30 from the viewpoint of improving the display performance of the electrochromic display device 100 and the like. Specifically, for example, anodized alumina, a mesh (net) -like sheet material, and the like are exemplified, but the invention is not limited thereto.

  Further, when the spacer 51 is a granular body, for example, the paste obtained by mixing the spacer 51 and the electrochromic composition 52 is sandwiched between the counter electrode 20 and the display electrode 40, thereby forming an electrochromic composition. The physical layer 50 is formed.

The electrochromic composition 52 includes a supporting electrolyte, a polar solvent, and a leuco dye.
The electrochromic composition 52 includes a display quality degradation inhibitor (hydroquinone derivative and / or catechol derivative, ferrocene derivative and compound having a carbonyl group) for suppressing degradation of display quality of the electrochromic display device 100, and An adsorbent 53 that adsorbs a leuco dye when energized for erasing between the counter electrodes 20 and the display electrodes 40 is added.
Moreover, as a component which can be added to the electrochromic composition 52, the polymer compound etc. for adjusting the physical property (for example, thickening etc.) of the electrochromic composition 52 are mentioned, for example.

The electrochromic composition 52 has a function of coloring and decoloring related to the display of the electrochromic display device 100.
Specifically, the electrochromic composition 52 is colored by energization between the counter electrode 20 and the display electrode 40, and is energized in the direction opposite to the energization for color development or energization for color development. Decoloring by blocking.
The electrochromic composition 52 only needs to have fluidity, and may be, for example, a low-viscosity liquid, a high-viscosity paste, or a gel with a low fluidity. good.

The supporting electrolyte which is a constituent component of the electrochromic composition 52 has a function for facilitating the flow of current through the electrochromic composition 52. The supporting electrolyte generally contains a compound called a molten salt or ionic liquid. As the supporting electrolyte, each compound may be used alone, or a plurality thereof may be mixed and used.
The supporting electrolyte is preferably added in an amount of 0.01 to 20% by weight with respect to the total weight of the electrochromic composition 52, and 0.1 to 20% by weight for sufficient expression of the function. It is more preferable to add so that it may become%.

Specifically, the supporting electrolyte is not particularly limited as long as it is a compound having the above function. For example, the supporting electrolyte is represented by the following general formula (1) and the following general formula (2). And at least one of the compound represented by the following general formula (3).
(In the formula, M ₁ represents Li, Na, K, Rb, Cs, or NH _{4. In the} formula, X ₁ represents ClO ₄ , BF ₄ , CF ₃ SO _3, or PF _6. )
(In the formula, R 1 represents an alkyl group or an aryl group. In the formula, R 2 represents an alkyl group. In the formula, N represents a nitrogen atom. In the formula, X ₂ represents Cl, Br, I, ClO ₄ , BF. ₄ represents CF ₃ SO ₃ or PF _{6. In the} formula, n represents 0, 1 or 2, and m represents 4-n.
(In the formula, R3 represents a linear or branched alkyl group having 1 to 16 carbon atoms and a halogen atom. In the formula, R4, R5 and R6 are a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkylcarbonyl group, Represents an alkoxy group, a carbonylalkoxy group or a dialkylamino group, wherein X represents a halogen atom, a BF ₄ group, a PF ₆ group, a CH ₃ SO ₃ group, a CF ₃ SO ₃ group or a p-toluenesulfonic acid group; However, in the formula, R3 and X are not simultaneously halogen atoms.)

Examples of the compound represented by the general formula (1) include NaClO ₄ , LiClO ₄ , KClO ₄ , RbClO ₄ , CsClO ₄ , NH ₄ ClO ₄ , LiBF ₄ , and LiPF _6. However, it is not limited to these. In addition, as for the compound in which a general formula is represented by said formula (1), various types may be used independently and may be used in combination of 2 or more types suitably.

Examples of the compound represented by the general formula (2) include (CH ₃ ) ₄ NClO ₄ , (C ₂ H ₅ ) ₄ NClO ₄ , (n-C ₄ H ₉ ) ₄ NClO. ₄ , (CH ₃ ) ₄ NBF ₄ , (C ₂ H ₅ ) ₄ NBF ₄ , (n-C ₄ H ₉ ) ₄ NBF ₄ , (CH ₃ ) ₄ NCl, (C ₂ H ₅ ) ₄ NCl, (CH ₃ ) ₄ NBr, (C ₂ H ₅ ) ₄ NBr, (n-C ₄ H ₉ ) ₄ NBr, (n-C ₄ H ₉ ) ₄ NI, C ₆ H ₅ (CH ₃ ) ₃ NClO ₄ , C ₆ H ₅ (C ₂ H ₅ ) ₃ NClO ₄ , C ₈ H ₁₇ (CH ₃ ) ₃ NClO ₄ , (C ₂ H ₅ ) ₄ NPF ₆ , (nC ₄ H ₉ ) ₄ NPF ₆ , (CH ₃ ) _{4 NCF 3 SO 3, (C} 2 H 5) 4 NCF 3 SO 3 or the like can be mentioned, et al That, without being limited thereto. In addition, the compound in which the general formula is represented by the above formula (2) may be used alone or in combination of two or more.

In addition, examples of the compound represented by the general formula (3) include the following formulas (4) to (29), but are not limited thereto. In addition, as for the compound in which a general formula is represented by said formula (3), various types may be used independently and may be used in combination of 2 or more types suitably.

  The polar solvent, which is a constituent component of the electrochromic composition 52, is at least one organic solvent that exhibits electrical conductivity using a supporting electrolyte, and has a function of promoting decolorization of the leuco dye by blocking voltage and / or current. . The polar solvent also serves as a solvent for the polymer compound when the polymer compound is added to the electrochromic composition 52. Various polar solvents may be used alone, or two or more polar solvents may be appropriately used in combination.

Although the example of a suitable polar solvent is shown below, these are illustrations and do not limit a polar solvent.
Specific examples of the polar solvent include N-methylpyrrolidone, dimethylformamide, diethylformamide, N, N-dimethylacetamide, propylene carbonate, dimethyl sulfoxide, γ-butyrolactone, acetonitrile, propionitrile, butyronitrile and the like. It is done. Any of the exemplified polar solvents is preferable as a polar solvent used as a component of the electrochromic composition 52, and particularly preferable examples include N, N-dimethylacetamide, propylene carbonate, and dimethyl sulfoxide.

The leuco dye that is a constituent component of the electrochromic composition 52 is a colorless or light-colored electron-donating dye precursor, and is a compound that develops color by a developer such as a phenolic compound, an acidic substance, or an electron-accepting substance.
Examples of leuco dyes include compounds that have a lactone, lactam, sultone, spiropyran, ester, or amide structure in the partial skeleton and can be practically colorless. Specific examples include triallylmethane compounds, bisphenylmethane compounds, xanthene compounds, fluorane compounds, thiazine compounds, spiropyran compounds and the like, but are not limited thereto.

  The leuco dye can be colored in various colors by appropriately selecting from the above compounds. Therefore, the display color of the electrochromic display device 100 using a leuco dye can be appropriately selected depending on the leuco dye. Specifically, for example, when a leuco dye that develops black is used, black and white and gray display are possible.

  Since the blending amount of the leuco dye depends on the solubility of the leuco dye, it is difficult to express it generally. However, the leuco dye needs to be blended in a sufficient amount for color development. In the case of a leuco dye having a low solubility, the volume of the electrochromic composition layer 50 (the thickness of the spacer 51) corresponding to each pixel 60 is increased, for example, so as to include a necessary amount. It is good to adjust the amount.

The display quality degradation inhibitor added to the electrochromic composition 52 is a compound having a function of suppressing degradation of display quality of the electrochromic display device 100 due to repeated operations of coloring and decoloring of the leuco dye.
The addition amount of the display quality deterioration inhibitor is preferably 1 to 20% by weight based on the content of the leuco dye, and 5 to 20% by weight for sufficient expression of the function. It is preferable to add so that it becomes.

  The display quality degradation inhibitor includes a first display quality degradation inhibiting compound (hydroquinone derivative and / or catechol derivative), a second display quality degradation inhibiting compound (ferrocene derivative), and a third display quality degradation inhibiting compound (carbonyl). And a compound having a group (acetophenone derivative and / or dibenzoyl derivative)).

The adsorbent 53 added to the electrochromic composition 52 is, for example, aluminum oxide and / or aluminum hydroxide.
The mode of addition of the adsorbent 53 (aluminum oxide and / or aluminum hydroxide) is not particularly limited, but it is added as a powder to the electrochromic composition 52, and a homogenizer such as an ultrasonic wave, a ball mill, or a homomixer. Is preferably dispersed as a dispersion of the electrochromic composition 52 solution. Moreover, the said dispersion liquid is apply | coated on counter electrode 20 ..., for example, as shown in FIG. 3, it can also be used as a layer (adsorption layer) of the adsorption agent 53. FIG.

The amount of adsorbent 53 added varies depending on the activity, particle size, etc. of the aluminum oxide and / or aluminum hydroxide used.
Aluminum oxide with a small surface area such as α-alumina, large aluminum oxide with a particle size of 10 μm or more, aluminum hydroxide with a small surface area, and aluminum hydroxide with a particle size of 10 μm or more have a small leuco dye adsorption effect and are sufficient In order to develop a proper adsorption action, 0.5 gram to 5 grams, preferably 1 gram to 3 grams, is preferably added to 1 gram of leuco dye.
In addition, aluminum oxide having a large surface area, such as γ-alumina, small aluminum oxide having a particle size of 1 μm or less, aluminum hydroxide having a large surface area, and small aluminum oxide having a particle size of 1 μm or less have a large leuco dye adsorption effect. Therefore, a sufficient adsorption operation is exhibited with addition of 0.1 gram to 0.5 gram per gram of leuco dye.
In addition, activated alumina used for thin layer chromatography and the like can be added in an amount of 0.1 to 0.5 gram per gram of leuco dye, even if it is a large particle having a particle size of several tens of micrometers. , Express sufficient adsorption operation.

The adsorbent 53 that adsorbs the leuco dye can be easily obtained as a chemical product.
Although the example of the suitable commercially available adsorption agent 53 is shown below, these are illustrations and do not limit adsorbent 53.
Specific examples of the commercially available adsorbent 53 include, for example, aluminum oxide 60GN neutral for thin layer chromatography (particle size: 4 μm to 50 μm) manufactured by Merck & Co., Ltd., Nippon Light Metal's low soda alumina LS235 (particle size: 0.47 μm), activated alumina C200 ( Particle diameter 4.4 μm), aluminum hydroxide B1403 (particle diameter 1.5 μm), γ-alumina KC501 (particle diameter 1 μm) manufactured by Sumitomo Chemical, alumina sol-A2 manufactured by Kawaken Fine Chemical Co., Ltd., and the like.

The polymer compound added to the electrochromic composition 52 has a function of increasing the viscosity of the electrochromic composition 52 and facilitating the handling thereof. Various polymer compounds may be used alone, or two or more polymer compounds may be appropriately used in combination.
The polymer compound is used to increase the viscosity of the electrochromic composition 52. In this case, the properties of the electrochromic composition 52 include a low-viscosity liquid, a high-viscosity paste, and a low fluidity gel. can do.
It is preferable that the compounding quantity of a polymer compound shall be 0.1 to 80 weight% with respect to the weight of the electrochromic composition 52 whole.

Although the example of a suitable polymer compound is shown below, these are illustrations and do not limit a polymer compound.
Specific examples of the polymer compound include, for example, a polyalkylene oxide such as polyvinylidene fluoride, polyvinylidene chloride, and polyethylene oxide, or a polymer having a repeating unit of polyalkyleneimine and polyalkylene sulfide, polymethyl methacrylate, polyacrylonitrile, Examples thereof include polyvinyl formal such as polycarbonate and polyvinyl butyral. Particularly preferred are polyvinyl butyral and polyvinylidene fluoride.

  The electrochromic composition 52 described above is an example. If the composition is capable of electrochemical color development, the electrochromic composition layer 50 that is held by the spacer 51 is used. Is possible.

(First voltage switching unit)
For example, as shown in FIG. 1, the display device 1000 includes a plurality of (for example, the same number of counter electrodes 20 included in the electrochromic display device 100) first voltage switching units 200.
For example, the first voltage switching unit 200 switches the voltage applied to the counter electrode 20 connected to the first voltage switching unit 200.
Specifically, as shown in FIG. 4, for example, the first voltage switching unit 200 is connected to the counter electrode 20 that forms the selected pixel, and is used as a selective counter potential output unit that outputs a potential V4. A non-selective counter potential output circuit 220 as a non-selective counter-potential output means that is connected to the potential output circuit 210 and the counter electrode 20 that forms a non-selected pixel and outputs a potential V3 (V3> V4), and a counter electrode And a circuit change-over switch 230 that switches a potential output circuit to be connected to 20 between a selective opposing potential output circuit 210 and a non-selective opposing potential output circuit 220.

  The selective counter potential output circuit 210 functions as a first positive voltage power supply 201 that outputs a positive voltage, a first P-channel transistor 202 that functions as a switch, a first negative voltage power supply 203 that outputs a negative voltage, and a switch. And a first N-channel transistor 204.

The first positive voltage power supply 201 is configured to be turned ON / OFF by the counter electrode selection unit 300, for example. When the first positive voltage power supply 201 is turned on, a positive voltage is applied to one end (source) of the first P-channel transistor 202.
The first P-channel transistor 202 has, for example, a gate connected to the gate terminal 200a, one end (source) connected to the first positive voltage power source 201, and the other end (drain) connected to the counter electrode 20 of the electrochromic display device 100 and a circuit. It is connected to the output terminal 200b connected via the changeover switch 230.

The first negative voltage power supply 203 is configured to be turned on / off by the counter electrode selection unit 300, for example. When the first negative voltage power supply 203 is turned on, a negative voltage at one end (source) of the first N-channel transistor 204 is applied.
The first N-channel transistor 204 has, for example, a gate connected to the gate terminal 200a, one end (source) connected to the first negative voltage power supply 203, and the other end (drain) connected to the counter electrode 20 of the electrochromic display device 100 and a circuit. It is connected to the output terminal 200b connected via the changeover switch 230.

The non-selective counter potential output circuit 220 functions as a first positive voltage power supply 201 that outputs a positive voltage, a first P-channel transistor 202 that functions as a switch, a first negative voltage power supply 203 that outputs a negative voltage, and a switch. The first N-channel transistor 204 is connected to the circuit change-over switch 230 via the resistor 220a.
That is, the non-selective opposing potential output circuit 220 is not directly connected to the circuit changeover switch 230 but is different from the selective opposing potential output circuit 210 only in that it is connected via the resistor 220a.

The circuit changeover switch 230 is configured to be changed by the counter electrode selection unit 300, for example.
Specifically, if the counter electrode 20 connected to the circuit switch 230 is the counter electrode 20 forming the selected pixel, the circuit switch 230 is switched to the selection counter potential output circuit 210 side, and the circuit If the counter electrode 20 connected to the change-over switch 230 is the counter electrode 20 forming a non-selected pixel, it is switched to the non-selection counter potential output circuit 220 side.

(Counter electrode selection part)
The counter electrode selection unit 300 applies a positive voltage or a negative voltage to the counter electrode 20 (line electrode) by controlling the first voltage switching unit 200 according to a control signal from the control unit 600, for example.

  Specifically, the counter electrode selection unit 300 applies a predetermined positive voltage to the gate terminal 200a of the first voltage switching unit 200 and the first positive voltage power supply 201 in the non-selection counter potential output circuit 220, for example. Turn on. As a result, the predetermined positive voltage is applied to the gate of the first P-channel transistor 202, and the positive voltage from the first positive voltage power supply 201 is applied to one end (source) of the first P-channel transistor 202. The 1P channel transistor 202 is turned on, and a predetermined plus potential (in this embodiment, the potential V3 in this embodiment) is output from the output terminal 200b of the non-selection opposing potential output circuit 220.

  On the other hand, the counter electrode selection unit 300 applies a predetermined negative voltage to the gate terminal 200a of the first voltage switching unit 200 and turns on the first negative voltage power supply 203, for example, in the selection counter potential output circuit 210. As a result, the predetermined negative voltage is applied to the gate of the first N-channel transistor 204, and the negative voltage from the first negative-voltage power supply 203 is applied to one end (source) of the first N-channel transistor 204. The 1N channel transistor 204 is turned ON, and a predetermined negative potential (in the present embodiment, the potential V4) is output from the output terminal 200b of the selective counter potential output circuit 210.

Further, the counter electrode selection unit 300 switches, for example, the circuit selector switch 230 connected to the counter electrode 20 that forms the selected pixel to the selection counter potential output circuit 210 side, and also forms the non-selected pixel. Is switched to the non-selection opposing potential output circuit 220 side.
Thereby, the selective counter potential output circuit 210 is connected to the counter electrode 20 forming the selected pixel, and the non-selective counter potential output circuit 220 is connected to the counter electrode 20 forming the non-selected pixel via the resistor 220a. Is done.

(Second voltage switching unit)
For example, as shown in FIG. 1, the display device 1000 includes a plurality (for example, the same number as the number of display electrodes 40 included in the electrochromic display device 100) of second voltage switching units 400.
For example, the second voltage switching unit 400 switches a voltage applied to the display electrode 40 connected to the second voltage switching unit 400.
Specifically, for example, as shown in FIG. 5, the second voltage switching unit 400 is connected to the display electrode 40 forming the selected pixel, and outputs a predetermined potential (potential V1 or potential V5). A selection display potential output circuit 410 as a potential output means; a non-selection display potential output circuit 420 as a non-selection display potential output means connected to the display electrode 40 forming a non-selected pixel and outputting a potential V 2; The circuit selector switch 430 is configured to switch the potential output circuit to be connected to the display electrode 40 between the selection display potential output circuit 410 and the non-selection display potential output circuit 420.

  The selection display potential output circuit 410 functions as a second positive voltage power supply 401 that outputs a positive voltage, a second P-channel transistor 402 that functions as a switch, a second negative voltage power supply 403 that outputs a negative voltage, and a switch. And a second N-channel transistor 404.

The second positive voltage power supply 401 is configured to be turned ON / OFF by the display electrode selection unit 500, for example. When the second positive voltage power supply 401 is turned on, a positive voltage is applied to one end (source) of the second P-channel transistor 402.
For example, the second P-channel transistor 402 has a gate connected to the gate terminal 400a, one end (source) connected to the second positive voltage power supply 401, and the other end (drain) connected to the display electrode 40 of the electrochromic display device 100 and a circuit. It is connected to the output terminal 400b connected through the changeover switch 430.

The second negative voltage power supply 403 is configured to be turned on / off by the display electrode selection unit 500, for example. When the second negative voltage power supply 403 is turned on, a negative voltage at one end (source) of the second N-channel transistor 404 is applied.
For example, the second N-channel transistor 404 has a gate connected to the gate terminal 400a, one end (source) connected to the second negative voltage power supply 403, and the other end (drain) connected to the display electrode 40 of the electrochromic display device 100 and a circuit. It is connected to the output terminal 400b connected through the changeover switch 430.

The non-selection display potential output circuit 420 functions as a second positive voltage power supply 401 that outputs a positive voltage, a second P-channel transistor 402 that functions as a switch, a second negative voltage power supply 403 that outputs a negative voltage, and a switch. The second N-channel transistor 404 is connected to the circuit change-over switch 430 via the resistor 420a.
That is, the non-selection display potential output circuit 420 is different from the selection display potential output circuit 410 only in that the non-selection display potential output circuit 420 is not directly connected to the circuit changeover switch 430 but via the resistor 420a.

The circuit changeover switch 430 is configured to be changed by the display electrode selection unit 500, for example.
Specifically, the circuit changeover switch 430 is switched to the selection display potential output circuit 410 side if the display electrode 40 connected to the circuit changeover switch 430 is the display electrode 40 forming the selected pixel. If the display electrode 40 connected to the changeover switch 430 is the display electrode 40 that forms a non-selected pixel, the display electrode 40 is switched to the non-selection display potential output circuit 420 side.

(Display electrode selection part)
The display electrode selection unit 500 applies a positive voltage or a negative voltage to the display electrode 40 (data electrode) by controlling the second voltage switching unit 400 according to a control signal from the control unit 600, for example.

Specifically, the display electrode selection unit 500 applies, for example, a predetermined positive voltage to the gate terminal 400a of the second voltage switching unit 400 and the second positive voltage power supply 401 in the selection display potential output circuit 410. Turn on. As a result, the predetermined positive voltage is applied to the gate of the second P channel transistor 402, and the positive voltage from the second positive voltage power supply 401 is applied to one end (source) of the second P channel transistor 402. The 2P channel transistor 402 is turned on, and a predetermined positive potential (in the present embodiment, the potential V1) is output from the output terminal 400b of the selection display potential output circuit 410.
For example, in the selection display potential output circuit 410, the display electrode selection unit 500 applies a predetermined negative voltage to the gate terminal 400a of the second voltage switching unit 400 and turns on the second negative voltage power supply 403. As a result, the predetermined negative voltage is applied to the gate of the second N-channel transistor 404 and the negative voltage from the second negative voltage power supply 403 is applied to one end (source) of the second N-channel transistor 404. The 2N channel transistor 404 is turned on, and a predetermined negative potential (potential V5 in this embodiment) is output from the output terminal 400b of the selection display potential output circuit 410.

  On the other hand, the display electrode selection unit 500 applies a predetermined negative voltage to the gate terminal 400a of the second voltage switching unit 400 and turns on the second negative voltage power supply 403, for example, in the non-selection display potential output circuit 420. . As a result, the predetermined negative voltage is applied to the gate of the second N-channel transistor 404 and the negative voltage from the second negative voltage power supply 403 is applied to one end (source) of the second N-channel transistor 404. The 2N channel transistor 404 is turned on, and a predetermined negative potential (potential V2 in the present embodiment) is output from the output terminal 400b of the non-selection display potential output circuit 420.

Further, the display electrode selection unit 500 switches, for example, the circuit changeover switch 430 connected to the display electrode 40 that forms the selected pixel to the selection display potential output circuit 410 side, and also displays the non-selected pixel. Is switched to the non-selection display potential output circuit 420 side.
Accordingly, the selection display potential output circuit 410 is connected to the display electrode 40 that forms the selected pixel, and the non-selection display potential output circuit 420 is connected to the display electrode 40 that forms the non-selection pixel via the resistor 420a. Is done.

(Control part)
The control unit 600 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and centrally controls the operation of each unit constituting the display device 1000.
The control unit 600 functions as a display control unit that causes the electrochromic display device 100 to display a predetermined image.

(Display operation)
For example, the control unit 600 controls the counter electrode selection unit 300 and the display electrode selection unit 500 on the basis of image data input from the outside, via the first voltage switching unit 200 and the second voltage switching unit 400. Then, an image based on the image data is displayed on the electrochromic display device 100 by passive matrix driving.
A method of applying a voltage to the electrochromic display device 100 by the control unit 600 of the present embodiment will be described with reference to FIG. Here, for convenience, the circuit selector switch 430 is directly connected to the non-selection display potential output circuit 420 without passing through the resistor 420a, and the circuit selector switch 230 is not connected through the resistor 220a. An example of a direct connection to is described.

  First, the control unit 600 switches each circuit selector switch 430 to the non-selection display potential output circuit 420 side to connect each display electrode 40 to the non-selection display potential output circuit 420, and sets each circuit switch 230 to each other. Switching to the non-selective counter potential output circuit 220 side connects each counter electrode 20 to the non-selective counter potential output circuit 220. Thereby, the potential of each display electrode 40 becomes the potential V2, and the potential of each counter electrode 20 becomes the potential V3. Actually, since the display electrode 40 is connected to the non-selection display potential output circuit 420 via the resistor 420a, the potential of each display electrode 40 is not the potential V2, but is divided by the counter electrode potential and the resistor 420a. Since the counter electrode 20 is connected to the non-selective counter potential output circuit 220 via the resistor 220a, the potential of each counter electrode 20 is not the potential V3 but the divided potential by the display electrode potential and the resistor 220a. .

Next, when performing display, the control unit 600 selects the pixel 60 to be colored, and between the counter electrode 20 that forms the selected pixel 60, that is, the selected pixel 60a, and the display electrode 40 that forms the selected pixel 60a. A voltage is applied to the display to energize for display (energization for coloring the pixel 60). Specifically, the control unit 600 switches the circuit change-over switch 430 connected to the display electrode 40 forming the selection pixel 60a to the selection display potential output circuit 410 side, and the display electrode 40 is switched to the selection display potential output circuit. 410 and the circuit selector switch 230 connected to the counter electrode 20 forming the selected pixel 60 a is switched to the selected counter potential output circuit 210 side to connect the counter electrode 20 to the selected counter potential output circuit 210. .
At this time, for example, as shown in FIG. 7, the control unit 600 divides the period for energization for the display into two periods, and in the first first period P1, the potential output circuit for selective display 410 is controlled to output the potential V1 (V1> V2, V1> V3), and the potential V5 (V5 <V3) is output from the selection display potential output circuit 410 in the next second period P2. Control. Thus, in the first first period P1, the potential of the display electrode 40 that forms the selection pixel 60a becomes the potential V1, and the potential of the counter electrode 20 that forms the selection pixel 60a becomes the potential V4. In the second period P2, the potential of the display electrode 40 becomes the potential V5, and the potential of the counter electrode 20 is maintained at the potential V4.

An example of a display operation for displaying an image on the electrochromic display device 100 will be described more specifically.
First, the control unit 600 controls the counter electrode selection unit 300 to select the counter electrode 20 in the first row (for example, the top counter electrode 20 in FIG. 2). In the first first period P1, The potential supplied to the selected counter electrode 20 is switched from the potential V3 (actually, the display electrode potential and the divided potential by the resistor 220a) to the potential V4, and in the next second period P2, the state in the first period P1 To maintain. When the second period P2 ends, the potential supplied to the selected counter electrode 20 is switched from the potential V4 to the potential V3 (actually, the display electrode potential and the divided potential by the resistor 220a). The counter electrode 20 is selected. The controller 600 is configured not to select a plurality of counter electrodes 20 at the same time.

  In addition, the control unit 600 controls the display electrode selection unit 500 to form the display electrodes that form the pixels 60 to be colored in the first row, for example, at substantially the same timing as the timing of selecting the counter electrode 20 in the first row. In the first first period P1, the potential supplied to the selected display electrode 40 is switched from the potential V2 (actually the counter electrode potential and the divided potential by the resistor 420a) to the potential V1. In the second period P2, the potential supplied to the selected display electrode 40 is switched from the potential V1 to the potential V5. When the second period P2 ends, the potential supplied to the selected display electrode 40 is switched from the potential V5 to the potential V2 (actually, the counter electrode potential and the divided potential by the resistor 420a), and the second row The display electrode 40 that forms the pixel 60 to be colored in the second row is selected at substantially the same timing as the timing of selecting the counter electrode 20.

And the control part 600 performs the process similar to the above about the counter electrode 20 of 2nd row, the counter electrode 20 of 3rd row, the counter electrode 20 of 4th row, the counter electrode 20 of 5th row, ... An image for one frame (one page) is displayed on the electrochromic display device 100.
Note that when one image is repeatedly displayed on the electrochromic display device 100, the color density of the one image displayed on the electrochromic display device 100 increases as the number of repetitions increases. Therefore, the control unit 600 causes the electrochromic display device 100 to display an image having a color density desired by the user by repeatedly executing a process of displaying an image for one frame a predetermined number of times.

Here, the numerical values (potentials supplied to the display electrode 40 (potentials V1, V2, V5) and potentials supplied to the counter electrode 20 (potentials V3, V4) are characteristic of the electrochromic display device 100 of the present embodiment. ), The definition of the length of the first period P1 and the second period P2, and the addition of the resistors 220a and 420a will be described.
First, numerical values (potentials supplied to the display electrode 40 (potentials V1, V2, V5), potentials supplied to the counter electrode 20 (potentials V3, V4), and lengths of the first period P1 and the second period P2) The case where the circuit selector switch 430 is directly connected to the non-selection display potential output circuit 420 and the circuit selector switch 230 is directly connected to the non-selection counter potential output circuit 220 will be described as an example.

For example, when the selected pixel 60a shown in FIG. 6A (pixel [1] in FIG. 6B) is colored, the potential of the display electrode 40 forming the selected pixel 60a is as shown in the upper part of FIG. In the first first period P1, the potential is V1, and in the second period P2, the potential is V5. Further, the potential of the counter electrode 20 forming the selected pixel 60a becomes the potential V4 over the first period P1 and the second period P2, as shown in the middle part of FIG. Therefore, between the display electrode 40 that forms the selected pixel 60a and the counter electrode 20 that forms the selected pixel 60a, as shown in the lower part of FIG. 7, the potential difference “V1−V4” in the first first period P1. (> 0) is applied, and the voltage of the potential difference “V5−V4” is applied in the next second period P2.
When the voltage of the potential difference “V1−V4” is applied to the selected pixel 60a, in the selected pixel 60a, a current flows from the display electrode 40 to the counter electrode 20 via the electrochromic composition 52, and the electrochromic composition layer The electrochromic composition 52 undergoes an electrochemical change at the interface between the electrode 50 and the display electrode 40 (the surface of the display electrode 40). As a result, the selected pixel 60a is colored.

  When the selected pixel 60a (pixel [1]) shown in FIG. 6A is colored, among the non-selected pixels 60b, the display electrode 40 that forms the non-selected pixel 60b and the counter electrode 20 that forms the selected pixel 60a. In the non-selected pixel 60b2 formed by (pixel [3] in FIG. 6B), the potential of the display electrode 40 forming the non-selected pixel 60b2 is the first period as shown in the upper part of FIG. The potential is V2 over P1 and the second period P2. Further, since the counter electrode 20 that forms the non-selected pixel 60b2 is the counter electrode 20 that forms the selected pixel 60a, the potential of the counter electrode 20 that forms the non-selected pixel 60b2 is as shown in the middle of FIG. The potential is V4 over the first period P1 and the second period P2. Accordingly, between the display electrode 40 that forms the non-selected pixel 60b2 and the counter electrode 20 that forms the non-selected pixel 60b2, as shown in the lower part of FIG. 9, the first period P1 and the second period P2 The voltage of the potential difference “V2−V4” is applied over the period.

  When the selected pixel 60a (pixel [1]) shown in FIG. 6A is colored, among the non-selected pixels 60b, the display electrode 40 that forms the non-selected pixel 60b and the counter electrode that forms the non-selected pixel 60b. 20, the potential of the display electrode 40 that forms the non-selected pixel 60b is the first value as shown in the upper part of FIG. 10, in the non-selected pixel 60b (pixel [4] in FIG. 6B). It becomes the potential V2 over the period P1 and the second period P2. Further, the potential of the counter electrode 20 forming the non-selected pixel 60b becomes the potential V3 over the first period P1 and the second period P2, as shown in the middle part of FIG. Therefore, between the display electrode 40 that forms the non-selected pixel 60b and the counter electrode 20 that forms the non-selected pixel 60b, as shown in the lower part of FIG. 10, the first period P1 and the second period P2 The voltage of potential difference “V2−V3” is applied over the period.

When the selected pixel 60a (pixel [1]) shown in FIG. 6A is colored, among the non-selected pixels 60b, the display electrode 40 that forms the selected pixel 60a and the counter electrode 20 that forms the non-selected pixel 60b. In the non-selected pixel 60b1 formed by (pixel [2] in FIG. 6B), the display electrode 40 that forms the non-selected pixel 60b1 is the display electrode 40 that forms the selected pixel 60a. As shown in the upper part of FIG. 8, the potential of the display electrode 40 forming the selection pixel 60b1 becomes the potential V1 in the first first period P1, and becomes the potential V5 in the next second period P2. Further, the potential of the counter electrode 20 forming the non-selected pixel 60b1 becomes the potential V3 over the first period P1 and the second period P2, as indicated by the solid line in the middle stage of FIG. Therefore, there is a potential difference between the display electrode 40 forming the non-selected pixel 60b1 and the counter electrode 20 forming the non-selected pixel 60b1 in the first first period P1, as indicated by the solid line in the lower part of FIG. A voltage of “V1−V3” (> 0) is applied, and a voltage of a potential difference “V5−V3” (<0) is applied in the next second period P2.
That is, the non-selected pixel 60b1 (pixel [2]) is energized (the display electrode 40 that forms the selected pixel 60a and the counter electrode 20 that forms the selected pixel 60a) for coloring the pixel 60 in the first period P1. (The selected pixel 60a (pixel [1])) is applied with a voltage in the same direction as the energization in the first period P1, hereinafter referred to as “coloring energization”. Therefore, the charge accumulated in the first period P1 between the display electrode 40 forming the selected pixel 60a and the counter electrode 20 forming the non-selected pixel 60b (non-selected pixel 60b1 (pixel [2])) is removed. Otherwise, the electric charge remains and causes image blurring (particularly, linear blurring along the display electrode 40).

Therefore, in the present embodiment, the length of the first period P1 and the length of the second period P2, and the potential V1, the potential V3, and the potential V5 are different from those of the display electrode 40 that forms the selection pixel 60a in the first period P1. The charge accumulated between the counter electrode 20 forming the selected pixel 60b (non-selected pixel 60b1 (pixel [2])) is set to a value that is substantially eliminated in the second period P2.
Specifically, for example, the length of the second period P2 is set to be substantially the same as the length of the first period P1, and the difference between the potential V5 and the potential V3 (specifically, between the potential V5 and the potential V3) (The absolute value of the difference) | V5−V3 | is set larger than the difference between the potential V1 and the potential V3 (specifically, the absolute value of the difference between the potential V1 and the potential V3) | V1−V3 |. .
Thereby, the charge accumulated in the first period P1 between the display electrode 40 forming the selected pixel 60a and the counter electrode 20 forming the non-selected pixel 60b (non-selected pixel 60b1 (pixel [2])) Since it can be removed by energization in the second period P2 (energization in the direction opposite to that for energizing the pixel 60; hereinafter referred to as “decoloring energization”), it is possible to suppress blurring of the image. Become.
In particular, by controlling the potential of the counter electrode 20 that forms the non-selected pixel 60b and the like, between the display electrode 40 that forms the selected pixel 60a and the counter electrode 20 that forms the non-selected pixel 60b in the first period P1 (non- A display electrode that forms the selection pixel 60a so that the charge accumulated between these electrodes is reliably removed by reliably grasping the amount of charge accumulated in the selection pixel 60b1 (pixel [2])). It is possible to control the potential of 40, the length of the first period P1, the length of the second period P2, and the like. Therefore, it is possible to surely prevent electric charge from remaining between these electrodes as compared with the case where the potential of the counter electrode 20 forming the non-selected pixel 60b is not controlled. As a result, blurring of the image can be accurately suppressed, and a high-quality image can be displayed.

In the present embodiment, the potential V5 is set so that V5 ≧ V4.
Thereby, the potential difference “V5−V4” in the second period P2 between the display electrode 40 forming the selected pixel 60a and the counter electrode 20 forming the selected pixel 60a (selected pixel 60a (pixel [1])). Becomes “V5-V4” ≧ 0. That is, since the voltage in the same direction as the decoloring energization is not applied to the selected pixel 60a (pixel [1]) in the second period P2, the voltage in the same direction as the decoloring energization is applied in the second period P2. In contrast, the contrast ratio is maintained, and a higher quality image can be displayed.
Note that the potential V5 can be arbitrarily changed as long as V5 ≧ V4. When the first period P1 and the second period P2 are substantially the same, preferably −V1 ≦ V5 <0 (where V1> 0). It is.
In the lower part of FIG. 7, the potential difference “V5−V4” is set to “V5−V4” = 0, but the illustrated potential and the potential difference are only examples, and the potential difference “V5−V4” is “V5−V4”> 0. It may be.

In the present embodiment, the potential V2 is set to satisfy V2 <0, and the potential V3 is set to satisfy V3> 0.
As a result, the potential difference “V2−V3” between the display electrode 40 that forms the non-selected pixel 60b and the counter electrode 20 that forms the non-selected pixel 60b becomes “V2−V3” <0. That is, since the voltage in the same direction as the decoloring current is applied between the display electrode 40 that forms the non-selected pixel 60b and the counter electrode 20 that forms the non-selected pixel 60b, the remaining charge is surely removed. can do. Therefore, bleeding of the image can be suppressed more accurately, and a higher quality image can be displayed. In the present embodiment, the potential difference “V2−V3” is set in a range in which no current flows in the current-voltage characteristics of the electrochromic display device 100.

Thus, each numerical value (potentials supplied to the display electrode 40 (potentials V1, V2, V5), potentials supplied to the counter electrode 20 (potentials V3, V4), the length of the first period P1 and the second period P2). It is possible to display a high-quality image with little blur.
However, each numerical value (potentials supplied to the display electrode 40 (potentials V1, V2, V5), potentials supplied to the counter electrode 20 (potentials V3, V4), lengths of the first period P1 and the second period P2) In some cases, it is not possible to display an image having a color density desired by the user at high speed only by defining the above.

  As described above, in the present embodiment, in order to suppress linear bleeding along the display electrode 40, for example, the length of the second period P2 is set to be substantially the same as the length of the first period P1, The difference | V5−V3 | between the potential V5 and the potential V3 is set larger than the difference | V1−V3 | between the potential V1 and the potential V3. That is, as indicated by the solid line in the lower part of FIG. 8, the non-selected pixel 60b1 (pixel [2]) formed by the display electrode 40 that forms the selected pixel 60a and the counter electrode 20 that forms the non-selected pixel 60b. The energization amount in the second period P2 is made larger than the energization amount in the first period P1, and the charge generated by the energization (coloring energization) in the first period P1 is energized (turned off) in the second period P2. It is to be removed by color energization). On the other hand, the influence of decoloring energization in the second period P2 in the non-selected pixel 60b1 (pixel [2]) reaches the selected pixel 60a (pixel [1]), and the selected pixel 60a (pixel [1]). The color density may not increase. In addition, the color of the selected pixel 60a (pixel [1]) is cut by the influence of decoloring current in the non-selected pixel 60b1 (pixel [2]) on both sides, and the width of the color pixel (particularly in the direction of the display electrode 40). (Width) may be narrowed. If the width of the color pixels is narrowed, the size of the color pixels is reduced, or a non-color-gap gap is formed between the color pixels, and the color density appears to be low.

  In the non-selected pixel 60b2 (pixel [3]) formed by the display electrode 40 that forms the non-selected pixel 60b and the counter electrode 20 that forms the selected pixel 60a, the first period P1 and the second period P2 As shown in the lower part of FIG. 9, the potential difference “V2−V4” is “V2−V4”> 0. That is, since the voltage in the same direction as the color development energization is applied to the non-selected pixel 60b2 (pixel [3]) and the voltage in the same direction as the decoloration energization is not applied, the color development of the selected pixel 60a (pixel [1]) is performed. Will not be adversely affected. By the way, in the present embodiment, the potential difference “V2−V4” is set in a range where current flows but does not develop color. Therefore, in this embodiment, the non-selected pixel 60b2 (pixel [3]) does not cause a color reaction but is in a state close to a state where a color reaction occurs, and easily develops a color on the selected pixel 60a (pixel [1]). Providing the situation.

  In the non-selected pixel 60b (pixel [4]) formed by the display electrode 40 that forms the non-selected pixel 60b and the counter electrode 20 that forms the non-selected pixel 60b, as shown in the lower part of FIG. A voltage having a potential difference “V2−V3” (a voltage in the same direction as the decoloring energization) is applied over the first period P1 and the second period P2. As described above, in this embodiment, the potential difference “V2” is applied. “−V3” is set in a range in which no current flows in the current-voltage characteristics of the electrochromic display device 100. Therefore, in this embodiment, the non-selected pixel 60b (pixel [4]) has no influence on the color of the selected pixel 60a (pixel [1]).

  As described above, when the circuit selector switch 430 is directly connected to the non-selection display potential output circuit 420 and the circuit selector switch 230 is directly connected to the non-selection counter potential output circuit 220, a high-quality image is displayed. Although it is possible, the color density of the selected pixel 60a (pixel [1]) does not increase easily due to the effect of decoloring energization in the non-selected pixel 60b1 (pixel [2]) (that is, an image for one frame is displayed). In some cases, the color density of the selected pixel 60a (pixel [1]) per process is low), and an image having a color density desired by the user cannot be displayed at high speed.

Therefore, in order to suppress the influence of decoloring energization in the non-selected pixel 60b1 (pixel [2]) on the color development of the selected pixel 60a (pixel [1]), in this embodiment, the circuit changeover switch 230 and the non-selective facing are used. A resistor 220 a is added between the potential output circuit 220.
Even when the resistor 220a is added, similarly to the case where the resistor 220a is not added (that is, when the circuit changeover switch 230 and the non-selection opposing potential output circuit 220 are directly connected), the non-selected pixel 60b1 (pixel [2] ]) Is applied with a voltage in the same direction as the color developing current and a voltage in the same direction as the decoloring current. However, by adding the resistor 220a, the voltage applied to the non-selected pixel 60b1 (pixel [2]) is the resistance. Smaller with partial pressure. That is, even if the output from the non-selection counter potential output circuit 220 is not changed and remains at the potential V3, the counter electrode 20 and the non-selection counter potential output circuit 220 that form the non-select pixel 60b via the resistor 220a As a result, the voltage is divided, and the potential supplied to the counter electrode 20 is not the potential V3 but the voltage divided by the resistor 220a. Specifically, as indicated by a one-dot chain line in the middle of FIG. 8, the potential of the counter electrode 20 is a divided potential V31 (V3 <V31 <V1) between the potential V1 and the potential V3 in the first period P1. Thus, the divided potential V32 (V5 <V32 <V3) between the potential V5 and the potential V3 in the second period P2.

Therefore, as indicated by a one-dot chain line in the lower part of FIG. 8, the non-selected pixel 60b1 (pixel [2]) has a potential difference “V1-V31” that is closer to zero than the potential difference “V1-V3” in the first period P1. Since the voltage is applied, the energization amount in the first period P1 in the non-selected pixel 60b1 (pixel [2]) is reduced, and it is possible to suppress the spread spreading linearly along the display electrode 40.
In addition, since the voltage of the potential difference “V5-V32” that is closer to zero than the potential difference “V5-V3” is applied to the non-selected pixel 60b1 (pixel [2]) in the second period P2, the non-selected pixel 60b1 (pixel [2]) is applied. The energization amount in the second period P2 in the pixel [2]) is reduced, and the influence of the decoloring energization in the non-selected pixel 60b1 (pixel [2]) on the color development of the selected pixel 60a (pixel [1]) is suppressed. Is possible. Therefore, the degree of increase in the color density is increased, and the color development speed can be improved.

Further, by adding a resistor 420a between the circuit changeover switch 430 and the non-selection display potential output circuit 420, the output from the non-selection display potential output circuit 420 is not changed, and the potential V2 remains unchanged. The potential supplied to the display electrode 40 is not a potential V2 but a divided potential by the resistor 420a (a divided potential between the potential V2 and the potential V4). Therefore, a voltage having a potential difference closer to zero than the potential difference “V2−V4” (see the lower part of FIG. 9) is applied to the non-selected pixel 60b2 (pixel [3]). ]) (That is, a current that causes a reaction unnecessary for image display) can be reduced. As described above, the current flowing through the intermediate potentials V2 and V3 causes an unnecessary chemical reaction that is not necessary for image display. However, the additional chemical reaction can be suppressed by adding the resistors 220a and 420a. The life of the electrochromic display device 100 can be extended.
In addition, since the current is limited by adding the resistors 220a and 420a, the power consumption of the electrochromic display device 100 can be reduced.

<Example>
Hereinafter, the present invention will be described in more detail with reference to specific examples, but the present invention is not limited thereto.

(Production of electrochromic display devices)
A 0.7 mm thick rectangular non-alkali glass substrate was used as the second substrate 30, and ITO was sputtered on one surface (lower surface). The sputtered ITO had a film thickness of 200 nm and a surface resistance of 10Ω / □. The sputter-formed ITO was formed into a stripe pattern with a stripe width of 0.42 mm and a pitch of 0.45 mm using a photolithography method, and display electrodes 40 were produced.
Similarly, a rectangular non-alkali glass substrate is used as the first substrate 10, and gold having a film thickness of 300 nm is formed on one surface (upper surface) by sputtering, and a stripe width of 0.40 mm using a photolithography method, A pattern was formed in a stripe shape with a pitch of 0.45 mm. Subsequently, an ITO film having a thickness of 200 nm was formed by sputtering on the gold stripe pattern. Thereafter, an ITO stripe pattern having a width of 0.42 mm and a pitch of 0.45 mm is formed on the gold stripe pattern by photolithography so that the ITO space portion overlaps the gold pattern space portion, and the counter electrode 20 ... were produced.

Next, Dispersion A having the following composition was adjusted by ball mill dispersion, and an adsorbent 53 layer (adsorption layer) was formed on the counter electrode 20 to have a film thickness of 10 μm.
The composition of Dispersion A is
Adsorbent 53 (aluminum oxide; Nippon Light Metal, activated alumina C200) 2 g,
2g of titanium dioxide (Ishihara Sangyo, titanium dioxide CR-93),
0.2 g of partially saponified polyvinyl alcohol (reagent, manufactured by Kanto Chemical)
20 g of distilled water
It is.

Next, an electrochromic composition 52 (hereinafter, referred to as a granule (Sekisui Chemical Co., Ltd. micropearl (particle size 50 μm))) and a predetermined additive (display quality degradation inhibitor, polymer compound, etc.) are added. The first substrate 10 having the adsorption layer formed on the counter electrodes 20 and the second substrate on which the display electrodes 40 are formed are prepared by mixing and dissolving the "electrochromic composition A"). 30. Then, the electrochromic display device 100 (hereinafter referred to as “display device A”) was manufactured by adjusting so that the counter electrodes 20 and the display electrodes 40 were orthogonal to each other and the orthogonal portions thereof were the pixels 60.
The composition of the electrochromic composition A is: Support electrolyte: 1-butylpyridinium hexafluorophosphate (the above formula (9)) 145 mg,
Polar solvent: propylene carbonate 1.0 g, dimethyl sulfoxide 1.0 g,
Leuco dye: 200 mg of leuco dye that develops black color as shown in the following formula (30),
Hydroquinone derivative: 2,5-ditertiary butyl hydroquinone 167 mg,
Compound having a carbonyl group: 122 mg of benzoylacetone, 35 mg of 2,6-ditertiarybutylbenzoquinone,
Polymer compound: Polyvinyl butyral (Sekisui Chemical's ESREC BH-3) 50 mg,
Gelling agent: 60 mg of an organic solvent gelling agent represented by the following formula (31).

(Display operation)
The first voltage switching unit 200 and the second voltage switching unit 400 are connected to the line electrode (counter electrode 20) and the data electrode (display electrode 40) included in the display device A, respectively, and the display device is displayed as the electrochromic display device 100. A display device 1000 having A was manufactured. The resistance values of the resistors 220a and 420a are both 50Ω.

Next, energization for display was performed using a passive matrix driving method.
Specifically, V1 = + 1.7V, V5 = -1.7V, V2 = -0.2V, V3 = + 0.2V, V4 = -1.7V, P1 = 0 at a speed of 1 ms per line. The process of displaying an image for one frame was repeated a predetermined number of times with .5 milliseconds and P2 = 0.5 milliseconds.

  Further, as a comparative example, a display device B in which the circuit changeover switch 430 is directly connected to the non-selection display potential output circuit 420 and the circuit changeover switch 230 is directly connected to the nonselection counter potential output circuit 220 is manufactured. As in the case of the display device A, the process of displaying an image for one frame was repeated a predetermined number of times. That is, the comparative example is different from the embodiment only in that the circuit selector switch 430 is directly connected to the non-selection display potential output circuit 420 and the circuit selector switch 230 is directly connected to the non-selection counter potential output circuit 220. .

(result)
Part of the image obtained in the example is shown in FIG. 11A, and part of the image obtained in the comparative example is shown in FIG. Of course, in FIG. 11A and FIG. 11B, the number of repetitions of processing for displaying an image for one frame is uniform.
As shown in FIG. 11B, the image obtained in the comparative example can be said to be a high-quality image without blurring of the image.
In contrast, as shown in FIG. 11A, the image obtained in the example is not only a high-quality image without blurring, but also has a color density higher than that of the image obtained in the comparative example. It turned out to be high and clear.

FIG. 12 shows changes with time in the color density of the image obtained in the example (color density of the selected pixel 60a) and the color density of the image obtained in the comparative example (color density of the selected pixel 60a).
In both the example and the comparative example, the color density increases with the passage of time (that is, with the increase in the number of repetitions of the process of displaying an image for one frame). It was found that the degree of increase in color density was greater than that of the comparative example, and the color development rate was faster. In other words, it was found that the image of the color density desired by the user can be displayed on the electrochromic display device 100 with a smaller number of processes (the number of repetitions of the process of displaying an image for one frame) in the embodiment.

  Further, it was also found that the degree of increase in the color density varies depending on the display image in the examples. Specifically, the larger the number of colored pixels and the colored area, such as a checkered pattern or all black, the smaller the potential difference generated in the non-selected pixel 60b1 (pixel [2]), and the higher the color density increase rate. I understood.

From the above results, the electric potential accumulated in the non-selected pixel 60b1 (pixel [2]) in the first period P1 is controlled in the second period P2 by controlling the potential of the counter electrode 20 forming the non-selected pixel 60b. It was found that, by removing almost all, even if a high-speed scan of 1 ms / line is performed, it is possible to suppress blurring of the image and display a high-quality image.
Further, by connecting the counter electrode 20 forming the non-selection pixel 60b and the non-selection counter potential output circuit 220 via the resistor 220a, the non-selection pixel 60b1 (for the color of the selection pixel 60a (pixel [1]) ( It has been found that the influence of decoloring energization in the pixel [2]) can be suppressed and the color development speed can be improved, and an image (image having a color density desired by the user) can be displayed at high speed.

  In the embodiment, the potentials (potentials V1, V2, V5) supplied to the display electrode 40, the potentials (potentials V3, V4) supplied to the counter electrode 20, and the lengths of the first period P1 and the second period P2. The resistance values of the resistors 220a and 420a are an example, and are arbitrarily determined depending on the configuration of the electrochromic display device 100 (specifically, the composition of the electrochromic composition 52, the material of the counter electrode 20 and the display electrode 40, etc.). It can be changed.

  According to the display device 1000 of the present invention described above, the first substrate 10, the counter electrode 20 provided on the upper surface of the first substrate 10, and the first substrate 10 facing the first substrate 10. A second substrate 30 formed of a transparent material, a display electrode 40 provided on the lower surface of the second substrate 30 and formed at least partly of a transparent electrode material, the first substrate 10 and the second substrate. An electrochromic composition layer 50 provided between the counter electrode 20 and the display electrode 40. The electrochromic composition layer 50 is provided between the counter electrode 20 and the display electrode 40. In the display device 1000 including the passive matrix drive electrochromic display device 100 that erases the display by energization in the direction opposite to the energization for the display, the counter electrode 20 The display electrode 40 is a plurality of electrodes extending in parallel in a direction orthogonal to the counter electrode 20, and the pixel 60 is formed in a region where the counter electrode 20 and the display electrode 40 intersect three-dimensionally. Is formed, and is connected to the display electrode 40 that forms the non-selected pixel 60b, and forms a non-selected display potential output circuit 420 (non-selected display potential output means) that outputs the potential V2, and a non-selected pixel 60b. Connected to the counter electrode 20 that is connected to the non-selective counter potential output circuit 220 (non-selective counter potential output means) that outputs the potential V3 and the display electrode 40 that forms the selected pixel 60a, and outputs a predetermined potential. The selective display potential output circuit 410 (selective display potential output means) to be connected to the counter electrode 20 forming the selection pixel 60a, and outputs the potential V4 (V4 <V3). And a control unit 600 (display control unit) that displays a predetermined image on the electrochromic display device 100. The control unit 600 is a counter unit that forms a selection pixel 60a. The period for conducting energization for display between the electrode 20 and the display electrode 40 that forms the selected pixel 60a is divided into two periods, and the first first period P1 is selected in the first first period. Control is performed so that the potential V1 (V1> V2, V1> V3) is output from the display potential output circuit 410, and the potential V5 (V5 <V3) is output from the selected display potential output circuit 410 in the next second period. Control is performed so that the length of the first period P1 and the length of the second period P2, and the potential V1, the potential V3, and the potential V5 are the display electrodes 40 that form the selection pixel 60a in the first period P1. And the counter electrode 20 forming the non-selected pixel 60b are set so that the charge accumulated in the second period P2 is substantially eliminated, and the non-selective counter potential output circuit 220 is connected via the resistor 220a. Are connected to the counter electrode 20.

Therefore, the electric charge accumulated in the first period P1 between the display electrode 40 forming the selected pixel 60a and the counter electrode 20 forming the non-selected pixel 60b can be substantially removed by energization in the second period P2. Therefore, it is possible to prevent the charge from remaining. As a result, it is possible to suppress bleeding of the image, and a high-quality image can be displayed.
Further, since the non-selection counter potential output circuit 220 is connected to the counter electrode 20 that forms the non-selection pixel 60b via the resistor 220a, the non-selection counter potential output circuit 220 is not connected to the display electrode 40 that forms the selection pixel 60a with respect to the color of the selection pixel 60a. It is possible to suppress the influence of decoloring energization in the non-selected pixel 60b1 formed by the counter electrode 20 that forms the selected pixel 60b. As a result, the color development speed can be improved, and an image (image having a color density desired by the user) can be displayed at a high speed. Furthermore, since the current is limited by adding the resistor 220a, the power consumption of the electrochromic display device 100 can be reduced.

  Further, according to the display device 1000 of the present invention described above, the non-selection display potential output circuit 420 is configured to be connected to the display electrode 40 through the resistor 420a.

  Therefore, by adding not only the resistor 220a but also the resistor 420a, the current is further limited, so that the power consumption of the electrochromic display device 100 can be further reduced.

  Further, according to the display device 1000 of the present invention described above, the length of the second period P2 is set to be substantially the same as the length of the first period P1, and the difference | V5-V3 | between the potential V5 and the potential V3 | Is set larger than the difference | V1−V3 | between the potential V1 and the potential V3.

  Therefore, the charge accumulated in the first period P1 between the display electrode 40 forming the selected pixel 60a and the counter electrode 20 forming the non-selected pixel 60b is reliably removed by energization in the second period P2. Can do.

  Further, according to the display device 1000 of the present invention described above, the potential V5 is set so that V5 ≧ V4.

  Therefore, a voltage in the opposite direction to the energization for coloring the pixel 60 in the second period P2 is not applied between the display electrode 40 forming the selected pixel 60a and the counter electrode 20 forming the selected pixel 60a. Therefore, the contrast ratio is maintained and a higher quality image can be displayed as compared with the case where a voltage in the direction opposite to the energization for coloring the pixel 60 in the second period P2 is applied. .

  Further, according to the display device 1000 of the present invention described above, the potential V2 is set to satisfy V2 <0, and the potential V3 is set to satisfy V3> 0.

  Accordingly, a voltage in the direction opposite to the energization for coloring the pixel 60 is applied between the display electrode 40 forming the non-selected pixel 60b and the counter electrode 20 forming the non-selected pixel 60b. It is possible to reliably remove the electric charge. Therefore, bleeding of the image can be suppressed more accurately, and a higher quality image can be displayed.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist thereof.

In the above embodiment, the length of the second period P2 is set to be substantially the same as the length of the first period P1, and the difference | V5-V3 | between the potential V5 and the potential V3 is set to the difference between the potential V1 and the potential V3. Although set larger than | V1-V3 |, the present invention is not limited to this. The length of the first period P1 and the length of the second period P2, and the potential V1, the potential V3, and the potential V5 are the counter electrode that forms the display electrode 40 that forms the selection pixel 60a and the non-selection pixel 60b in the first period P1. As long as the charge accumulated between 20 and 20 has a value that is substantially eliminated in the second period P2, it can be arbitrarily changed as appropriate.
In the above embodiment, the non-selective counter potential output circuit 220 is connected to the counter electrode 20 forming the non-selected pixel 60b via the resistor 220a, and the non-selective display potential output circuit 420 is connected to the resistor 420a. However, the present invention is not limited to this, and at least the non-selection counter potential output circuit 220 connects the non-selection pixel 60b via the resistor 220a. If connected to the counter electrode 20 to be formed, the non-selection display potential output circuit 420 may not be connected to the display electrode 40 forming the non-selection pixel 60b via the resistor 420a.

DESCRIPTION OF SYMBOLS 10 1st board | substrate 20 Counter electrode 30 2nd board | substrate 40 Display electrode 50 Electrochromic composition layer 60 Pixel 60a Selection pixel 60b Non-selection pixel 100 Electrochromic display device 210 Selection opposing potential output circuit (selection opposing potential output means)
220 Non-selective opposing potential output circuit (non-selective opposing potential output means)
220a Resistor 410 Selection display potential output circuit (selection display potential output means)
420 Non-selection display potential output circuit (non-selection display potential output means)
420a Resistor 600 Control unit (display control means)
1000 Display device P1 First period P2 Second period

Claims (5)

A first substrate, a counter electrode provided on an upper surface of the first substrate, a second substrate formed above the first substrate and facing the first substrate, and formed of a transparent material; A display electrode provided on the lower surface of the second substrate, at least a part of which is formed of a transparent electrode material, and an electrochromic composition layer provided between the first substrate and the second substrate. The display is performed by energization between the counter electrode and the display electrode, and the display is erased by energization in a direction opposite to the energization for the display between the counter electrode and the display electrode. In a display device comprising a passive matrix driven electrochromic display device,
The counter electrode is a plurality of electrodes extending in parallel,
The display electrode is a plurality of electrodes extending in parallel in a direction orthogonal to the counter electrode,
A pixel is formed in a region where the counter electrode and the display electrode intersect three-dimensionally,
A non-selection display potential output means connected to the display electrode forming the non-selection pixel and outputting a potential V2,
A non-selective counter potential output means connected to the counter electrode forming a non-selected pixel and outputting a potential V3;
Selection display potential output means connected to the display electrode forming the selection pixel and outputting a predetermined potential;
A selective counter potential output means connected to the counter electrode forming the selected pixel and outputting a potential V4 (V4 <V3);
Display control means for displaying a predetermined image on the electrochromic display device,
The display control means includes
A period in which energization for the display is performed between the counter electrode forming the selected pixel and the display electrode forming the selected pixel is divided into two periods, and the selection display is performed in the first first period. The potential V1 (V1> V2, V1> V3) is controlled to be output from the potential output means, and the potential V5 (V5 <V3) is output from the selection display potential output means in the next second period. Control and
The length of the first period and the length of the second period, and the potential V1, the potential V3, and the potential V5 form the display electrode and the non-selected pixel that form the selected pixel in the first period. The charge accumulated between the counter electrode is set to a value that is substantially eliminated in the second period,
The non-selective counter potential output means is connected to the counter electrode through a resistor. The display device according to claim 1,
The non-selection display potential output means is connected to the display electrode through a resistor. The display device according to claim 1 or 2,
The length of the second period is set to be substantially the same as the length of the first period,
A display device characterized in that a difference | V5-V3 | between the potential V5 and the potential V3 is set larger than a difference | V1-V3 | between the potential V1 and the potential V3. The display device according to any one of claims 1 to 3,
The display device characterized in that the potential V5 is set to satisfy V5 ≧ V4. In the display device according to any one of claims 1 to 4,
The potential V2 is set to satisfy V2 <0,
The display device, wherein the potential V3 is set to satisfy V3> 0.