JPS5834486A - Electrochromic display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrochromic (hereinafter referred to as I
It's called IQ. ) Regarding display devices.

The electrochemically colored substance used in the present invention is a substance that changes color when applied indoors or the like, and exhibits a phenomenon in which optical properties depend on electrical polarity, and is generally called a FiO substance.

The display principle of the EC display device is shown in FIGS. 1 and 2.

Perform 1 pleasure based on Figure 3. First, the structure of the EC display device will be explained with reference to FIG. The upper transparent substrate 1 is patterned with a transparent conductive film 3 having an arbitrary shape necessary for display. Furthermore, the space, poles 5 and 6 of the Mo3 film, which is an EOji material,
is being formed. 5 is a WO3 film for displaying in 7 segments, and 6 is an auxiliary electrode for transferring charge between electrodes. 7 is a propylene carbonate n solution of lithium perchlorate (Ltcio4), which is commonly used as a municipal solution. 8) A porous white background plate with a certain porosity, which is installed in a manner that makes the colored color clear when the WO3 film is colored. 9II't is a sawing agent which holds the substrate 2 between the opposing substrates 2, and is a sawing agent which seals the hole after injecting 1° of electrolyte into 4. 10 is a parting plate that covers the auxiliary electrode, electrode WO3 membrane, etc.
The display device is beautifully (2〈provided for display C).

From Figures 2 and 3, the driving method fzr is explained. Figure 2 is a flat (#) diagram with 7-segment numerical display, and the display method diagram is shown in Figure 2. , is a schematic diagram of the driving circuit of this experiment, and is the basic circuit of 'heavy transfer method q). 5a, 5b, 5c, 5a on the display surface.

There are 7 segment electrodes and poles of 5e, 5f, and 5g.
Auxiliary vehicles, @1.6, 6
L.

6M is placed below the parting board. The surface type of each of the seven segments of WO3 films 5a to 5g is 1, and the WO3 film 6 of the auxiliary electrode has 1.6L and 6M has 2.

The table below shows a numerical display program using 6L and 6MVC on the 7-segment electrodes 5a to 5g and 5 auxiliary electrodes 6, which are WO3 films. The 0 mark is blue. × Discoloration.

From the numerically displayed program table, it can be seen that the colored area is always 7. In addition, auxiliary Iy匪6x.

It can also be understood from this table that 6L and 6M compensate for the variation in colored area with only 7 segments.

The coloring principle will be explained based on FIG.

The colored side display electrode, which is an EC (WOa) substance, is colored by placing it in a negative position with respect to the decolored side display electrode, and the polarity of the applied voltage is reversed. However, it becomes a colorless and transparent state.The applied voltage is generally about 1 to 2 cm.

The coloring is achieved by injecting ions such as L1+ and protons from the electrolytic solution into the EC material from the conductive film to form tungsten bronze, which turns blue. Also, decolorization +d:%Li
+, This is due to the extraction of ions such as protons and electrons.

XM + WO3 + By switching the switch based on a numerical display program, ten kinds of numbers 1 to 0 can be displayed. By continuously changing this switch, the colorless state gradually changes to a blue color.

The above is the display principle of the GC display device. A major problem with UCC coating equipment is that it is difficult to maintain a constant color density and obtain a long life.

5- Conventionally, as a method to solve the problems of such EC display devices, there have been two methods: one is to always inject a certain amount of EC material into the EC substance to maintain the displayed concentration, and the other is to maintain the displayed concentration. A method has been considered in which the entire display concentration is maintained constant by applying the full voltage to the electrode and the auxiliary electrode, performing transfer, and changing the applied T voltage.

However, in order to obtain the desired coloring density in these methods, it is necessary to apply the full voltage according to the density.
For example, commercially available 1.5V [Pond (if used, air, pond 1
If the Tlf pressure applied to the electrode is different from the Tlf pressure applied to the electrode, a circuit for creating and controlling the voltage applied to the electrode is required, which makes the drive circuit complicated. Furthermore, when the voltage is increased to obtain a higher concentration, the '+n' river of the chemical reaction becomes higher, resulting in problems such as a shorter life.

The present invention has been made in order to eliminate the above-mentioned drawbacks.
By controlling between KA and KA, even if the GC display device is operated once at a constant battery voltage, the EC display device can easily stabilize the display concentration as required over a long period of time. This is what we provide.

The WO3 film thickness and coloring density 1)f of the present invention will be explained.

1 and 2, the 7-segment l-electrodes 5a to 5g, which are WOa membranes, and the auxiliary chamber, 4φi,
6K.

6L, 6M wo 3 film thickness is taken as a factor (C,
We conducted an experiment. Explain the structure to the old wholesaler 1. The transparent conductive film 3 is an rn203 film formed by vacuum evaporation.
The turning grooves are arranged so that the area of each conductive film is equal. In this experiment, the area of the conductive film in one segment was about 3-3. Then, the city and pole of the WO3 film were formed thereon by deuteron beam evaporation so that the display area was about 065-.

As a result of changing the numbers on this EC display device at 1.5V like turning a clock, data as shown in Fig. 4 ψ) was obtained. Let me explain the meaning of the coloring density in this experiment. Using an optical method, the reflectance of the white back JW 4M was set to 100, and the reflectance of the colored capital was measured against it, and the reflectance was taken as the density. In general, in colored preparations, if the density is higher than about 40%, a clear display cannot be obtained. When the brightness of the white background plate used in this experiment was measured with a colorimetric colorimeter, data was obtained that X was 77 and Y was 80.2 and 95. .4,5,7゜10
, +2KA, the numbers were switched every 2 seconds, and the density when the number of switching was 200 and the density when the switching was 6.5 x 106 times were plotted. From the results of this experiment, the film of the WO3 film;
By changing ((), a more arbitrary display concentration can be obtained, and long-term concentration stability can also be obtained: f''1-).

′! J7v, the response time (Sθc) after 2oo times was checked and plotted in FIG.

The results are summarized from the data in Figures 4 and 5.

(]) Clear display cannot be obtained with a WO3 film of 4KA or less.

(2) A WO3 film of 10 KA or more has a very slow response time, which is a major drawback as a display device.

(3) A WO3 film of 4 to 10 KA provides excellent display as a display device.

Regarding the above results, in a WO3 film of 4KA or less, an amount of charge sufficient to obtain a concentration higher than 40% cannot be injected into the WO3 film.

To give a simple explanation, IKA's thin WO in a colored state.
3.If you do not stack 4 or more films, you will not get a clear blue color)1
There will be no. Further, by overlaying the WOa film on top of it, the density becomes higher. As a result, Won
The amount of charge within the film will also increase. Therefore, the movement of the load gradually slows down, and when the film thickness exceeds 10 KA, the response time becomes extremely slow.

%, 4-7KA is the coloring density, response (/I W Oa
There is little dependence on film thickness, and it is easy to obtain stable characteristics in manufacturing the display device.

The reason why the graphs in Figures 4 and 5 do not deviate from the straight line is that the relationship between the ability to hold charges and the leakage of electric charges into circuits, etc.
We believe this phenomenon is caused by slight differences depending on the WO3 film thickness.

91 Since the present invention is constructed as described above, a wonderful EC display device is completed because the drive circuit is simple and stable display intensity can be obtained over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of an electrochromic display device, and FIG. 2 is a plan view thereof, showing an example of numerical display using a seven-segment system. Figure 3 is a schematic diagram of the drive circuit that switches the display between each market.
This is a graph showing the result data when an experiment was conducted using 12KA, and FIG. 5 is a graph of the result data plotting the response time at that time. 1... Upper transparent substrate 2... Counter substrate 3... Transparent conductive film 4... Hole sealing agent ""r br c+ d+ e+ frg" ””
On the segment Won film 6, L, M......auxiliary electrode WO3 film 7°°°°
”° Electrolyte 8...White background board-10
-9...Nuring agent 10...Parting board 2 Applicant Daini Kozue Tamasha Co., Ltd. Agent Patent attorney -11- Fig. 1 Fig. 20 1 C No. 3 A certain Ml in Tushan - Well o o
H~ to +
(0 one scoop

Claims (1)

[Claims] A pair of substrates, at least one of which is transparent, is sandwiched between N and M materials, and a plurality of boles of an electrochemically colored substance are formed on a conductive film provided on at least one of the substrates. , at least some of the plurality of electrodes constitute a display pixel, and when the display is completely changed, at least some of the electrodes that hold charges are replaced by electrodes that do not hold charges. An electrochromic display device in which a display is changed by transferring charge to at least some electrodes of an electrochromic display device, the electrochromic display device being formed with an electrochemical coloring material having a film thickness in the range of f4 to 10 KA.