CN116420004A

CN116420004A - Insulating glass unit, method for producing such an insulating glass unit, and method for operating a dynamic shade in such an insulating glass unit, substrate

Info

Publication number: CN116420004A
Application number: CN202180075689.2A
Authority: CN
Inventors: 杰弗里·科斯库利奇; 乔舒亚·芬奇; 戴维·劳伦斯
Original assignee: Guardian Glass LLC
Current assignee: Guardian Glass LLC
Priority date: 2020-12-30
Filing date: 2021-12-22
Publication date: 2023-07-11
Also published as: EP4271907A1; JP2024506776A; WO2022144705A1; CA3195996A1; KR20230124892A; AU2021412383A1

Abstract

The present invention provides potential driven shades that can be used with Insulating Glass (IG) units, IG units including such shades, and/or associated methods. In such units, a dynamic shade is positioned between the substrates (102, 104) defining the IG unit and is movable between a retracted position and an extended position. The dynamic shade includes a glass upper layer including transparent conductors and insulator or dielectric films, and a shutter (312). The shutter includes an elastomeric polymer based layer and a conductive layer. A first voltage is applied to the transparent conductor to extend the shutter to a closed position and a second voltage is applied to a stopper (504) to electrostatically hold the shutter (312) in the closed position. Once the shutter (312) is extended to the closed position, the first voltage level and the second voltage level may decrease, the decrease in the first voltage level being greater than the decrease in the second voltage level.

Description

Insulating glass unit, method for producing such an insulating glass unit, and method for operating a dynamic shade in such an insulating glass unit, substrate

Related patent application

The present application claims priority from U.S. patent application Ser. No. 17/138,528, filed on 30 months 12 and 2020, which is a continuation-in-part application of U.S. patent application Ser. No. 16/947,014, filed on 15

months

7 and 2020, 3 months 2 and 927, each of which is incorporated herein by reference in its entirety.

Technical Field

Certain exemplary embodiments of the present invention relate to a shade that may be used with an insulated glass unit (IG unit or IGU), an IG unit including such a shade, and/or a method of making the same. More particularly, certain exemplary embodiments of the present invention relate to potential driven shades that may be used with an IG unit, IG units including such shades, and/or methods of making the same.

Background of the inventiondescription of the invention

The building sector is distinguished by its high energy consumption, which has been shown to account for 30% -40% of the world's major energy consumption. Operating costs such as heating, cooling, ventilation and lighting are the major contributors to this consumption, especially in older structures built with less stringent energy efficiency construction standards.

For example, the window provides natural light, fresh air, an inlet, and a connection to the outside. However, they sometimes also represent a significant source of wasted energy. As the trend toward increased use of architectural windows progresses, the conflicting benefits of balancing energy efficiency and human comfort become increasingly important. In addition, concerns over global warming and carbon footprint have increased the impetus for new energy-efficient glazing systems.

In this regard, because windows are typically "weak links" in building insulation, and considering modern architectural designs that typically include entire glass curtain walls, it is apparent that having better insulated windows would be advantageous in terms of controlling and reducing energy waste. Thus, the development of highly isolated windows has significant advantages both environmentally and economically.

An insulating glass unit (IG unit or IGU) has been developed and provides improved insulation to buildings and other structures, and fig. 1 is a schematic cross-sectional view of an exemplary IG unit. In the exemplary IG unit of fig. 1, the first substrate 102 and the second substrate 104 are substantially parallel to and spaced apart from each other. A spacer system 106 is disposed at the perimeter of the first and

second substrates

102, 104 to help maintain them in a substantially parallel spaced-apart relationship with each other and to help define a gap or space 108 therebetween. In some cases, the gap 108 may be at least partially filled with an inert gas (such as Ar, kr, xe, etc.), for example, to improve the isolation characteristics of the overall IG unit. In some cases, an optional outer seal may be provided in addition to the spacer system 106.

In most buildings, windows are unique elements in that they can "supply" energy to the building in the form of winter solar energy harvesting and annual sunlight. However, current window technology typically results in excessive heating costs in winter, excessive cooling costs in summer, and often fails to capture the benefits of sunlight, which causes lamps in commercial inventory in most countries to dim or shut down.

Thin film technology is a promising approach to improve window performance. The film may be applied, for example, directly to the glass during production, applied to a polymeric web that may be retrofitted to an existing window at a correspondingly lower cost, etc. And progress has been made over the past two decades, principally in reducing the U value of the window through the use of static or "passive" low emissivity (low E) coatings, and through the reduction of the solar thermal gain coefficient (SHGC) through the use of spectrally selective low E coatings. The low E coating may be used, for example, in conjunction with an IG unit, such as those shown and described in conjunction with FIG. 1. However, further enhancements are still possible.

For example, it should be appreciated that it would be desirable to provide a more dynamic IG unit option that takes advantage of the ability of the sun to "supply" energy to the interior of a building or the like, and also provides privacy in a more "on demand" manner, in view of the desire to provide improved insulation to the building or the like. It should be appreciated that such products are also expected to have a pleasing aesthetic appearance.

Certain example embodiments address these and/or other issues. For example, certain exemplary embodiments of the present invention relate to potential driven shades that may be used with an IG unit, IG units including such shades, and/or methods of making the same.

In certain exemplary embodiments, an Insulating Glass (IG) unit is provided. The first substrate and the second substrate each have an inner major surface and an outer major surface, the inner major surface of the first substrate facing the inner major surface of the second substrate. The spacer system helps to maintain the first and second substrates in a substantially parallel spaced apart relationship with each other and define a gap between the first and second substrates. An anchor and a stop are provided, wherein at least a portion of the stop is electrically conductive. A dynamically controllable shade is interposed between the first substrate and the second substrate. The shade includes a first conductive layer disposed directly or indirectly on the inner major surface of the first substrate; a first dielectric layer disposed directly or indirectly on a side of the first conductive layer opposite the first substrate; and a shutter including a flexible substrate supporting a second conductive layer, the shutter being extendable from the anchor toward the stopper to a shutter closed position and retractable from the stopper toward the anchor to a shutter open position. A second dielectric layer is disposed directly or indirectly on the anchor-facing surface of the stop. The control circuit is configured to: providing a first voltage to the first conductive layer and the second conductive layer to generate a first electrostatic force to drive the flexible substrate to the shutter closed position; and providing a second voltage to the conductive portion of the stopper to generate a second electrostatic force to help electrostatically lock the flexible substrate to the stopper.

In certain exemplary embodiments, a substrate is provided that includes an anchor and a stop, at least a portion of which is electrically conductive. A dynamically controllable shade is provided on the substrate, the shade comprising: a first conductive layer disposed directly or indirectly on the substrate; a first dielectric layer disposed directly or indirectly on a side of the first conductive layer opposite the substrate; and a shutter including a flexible substrate supporting a second conductive layer, the shutter being extendable from the anchor toward the stopper to a shutter closed position and retractable from the stopper toward the anchor to a shutter open position. A second dielectric layer is disposed directly or indirectly on the anchor-facing surface of the stop. The first and second conductive layers and the conductive portion of the stopper are each connectable to a control circuit configured to: providing a first voltage to the first conductive layer and the second conductive layer to generate a first electrostatic force to drive the flexible substrate to the shutter closed position; and providing a second voltage to the conductive portion of the stopper to generate a second electrostatic force to help electrostatically lock the flexible substrate to the stopper.

In certain exemplary embodiments, a method of making an Insulating Glass (IG) unit is provided. The method comprises the following steps: having a first substrate and a second substrate, each having an inner major surface and an outer major surface, the inner major surface of the first substrate facing the inner major surface of the second substrate. An anchor and a stop are provided. At least a portion of the stop is electrically conductive. A second dielectric layer is disposed directly or indirectly on the anchor-facing surface of the stop. Providing a dynamically controllable shade directly or indirectly on the first substrate and/or the second substrate, the shade comprising: a first conductive layer disposed directly or indirectly on an interior major surface of the first substrate; a first layer of the dielectric material is formed, the first dielectric layer is directly or indirectly disposed on a side of the first conductive layer opposite the first substrate; and a shutter including a flexible substrate supporting a second conductive layer, the shutter being extendable from the anchor toward the stopper to a shutter closed position and retractable from the stopper toward the anchor to a shutter open position. Connecting the first and second conductive layers and the conductive portion of the stopper to a control circuit configured to: (a) Providing a first voltage to the first conductive layer and the second conductive layer to generate a first electrostatic force to drive the flexible substrate to the shutter closed position; and (b) providing a second voltage to the conductive portion of the stopper to generate a second electrostatic force to help electrostatically lock the flexible substrate to the stopper. The first and second substrates are connected in a substantially parallel spaced apart relationship to each other such that a gap is defined between the first and second substrates and such that the dynamically controllable shade is located in the gap.

In certain exemplary embodiments, a method of operating a dynamic shade in an Insulating Glass (IG) unit is provided. The method includes having an IG unit prepared according to the techniques disclosed herein; and selectively activating the power source to move the polymeric substrate between the shutter open position and the shutter closed position.

The features, aspects, advantages, and exemplary embodiments described herein may be combined to realize another embodiment.

Drawings

These and other features and advantages may be better and more completely understood by reference to the following detailed description of exemplary illustrative embodiments in connection with the accompanying drawings, in which:

FIG. 1 is a schematic cross-sectional view of an exemplary insulating glass unit (IG unit or IGU);

FIG. 2 is a schematic cross-sectional view of an exemplary IGU incorporating potential driven shades that may be used in connection with certain exemplary embodiments;

FIG. 3 is a cross-sectional view illustrating an exemplary "on-glass" component of the exemplary IGU from FIG. 2 that enables shutter actuation, according to certain exemplary embodiments;

FIG. 4 is a cross-sectional view of an exemplary shutter from the exemplary IGU of FIG. 2, according to certain exemplary embodiments;

FIG. 5 is a plan view of a substrate incorporating the components on glass from the example of FIG. 3 and the shutter components from the example of FIG. 4, according to certain example embodiments;

FIG. 6 is a schematic diagram of a first exemplary shade with electrostatic retraction features implemented using two independent voltage sources according to certain exemplary embodiments;

FIG. 7 is a schematic diagram of a second exemplary shade with electrostatic retraction features implemented using a voltage source according to certain exemplary embodiments;

FIG. 8 is a cross-sectional view of a first shutter that may be used in conjunction with electrostatic retraction, according to certain example embodiments;

FIG. 9 is a cross-sectional view of a second shutter that may be used in conjunction with electrostatic retraction, according to certain example embodiments;

FIG. 10 is a cross-sectional view of a third shutter that may be used in conjunction with electrostatic retraction, according to certain example embodiments;

FIG. 11 is a schematic diagram of a portion of a dynamic shade system incorporating electrostatic latch stop bars according to certain example embodiments;

FIG. 12 is a flow chart detailing the manner in which the shade system of FIG. 11 is operable in certain exemplary embodiments;

FIG. 13 is a schematic diagram of an exemplary system for controlling shutter operation including a latch stop lever according to certain exemplary embodiments; and is also provided with

FIG. 14 illustrates an exemplary control circuit for a portion of a controller that can be used in connection with FIG. 13, according to certain exemplary embodiments.

Detailed Description

Certain exemplary embodiments of the present invention relate to potential driven shades that may be used with an IG unit, IG units including such shades, and/or methods of making the same. Referring now more particularly to the drawings, FIG. 2 is a schematic cross-sectional view of an exemplary insulating glass unit (IG unit or IGU) incorporating potential driven shades that may be used in connection with certain exemplary embodiments. More specifically, fig. 2 is similar to fig. 1 in that a spacer system 106 is used to separate the first and second substantially parallel spaced apart

glass substrates

102, 104 from one another and define a gap 108 therebetween. The first and second

potential driving shutters

202a and 202b are disposed in the gap 108 proximate to the inner major surfaces of the first and

second substrates

102 and 104, respectively. As will become more apparent from the description provided below, the

shades

202a and 202b are controlled by creating a potential difference between the

shades

202a and 202b and the conductive coatings formed on the inner surfaces of the

substrates

102 and 104, respectively. As will also become more apparent from the description provided below, each of the

shades

202a and 202b can be created using a polymer film coated with a conductive coating (e.g., a coating comprising a layer comprising Al, cr, ITO, etc.). Aluminum coated shades can provide partial to complete reflection of visible light and up to a significant amount of total solar energy.

The

shades

202a and 202b are typically retracted (e.g., rolled up), but they rapidly extend (e.g., unroll) upon application of an appropriate voltage so as to cover at least a portion of the

substrates

102 and 104 much like, for example, a "conventional" window shade. The rolled shade may have a very small diameter and will typically be much smaller than the width of the gap 108 between the first substrate 102 and the second substrate 104 so that it can function between them and be substantially hidden from view when rolled. The unrolled shades 202a and 202b are strongly attached to their respective

adjacent substrates

102 and 104.

The

shades

202a and 202b extend along all or a portion of the vertical length of the visible or "framed" area of the

substrates

102 and 104 from a retracted configuration to an extended configuration. In the retracted configuration, the

shades

202a and 202b have a first surface area that substantially allows transmission of radiation through the framed area. In the extended configuration, the

shades

202a and 202b have a second surface area that substantially controls the transmission of radiation through the framed area. The

shades

202a and 202b can have a width that extends across all or a portion of the horizontal width of the framed areas of the

substrates

102 and 104 to which they are attached.

Each of the

shades

202a and 202b is disposed between the first substrate 102 and the second substrate 104, and each is preferably attached at one end to its inner surface (or a dielectric or other layer disposed thereon) near its top. In this regard, an adhesive layer may be used. The

shades

202a and 202b are shown partially unfolded (partially extended) in fig. 2. The

shades

202a and 202b, as well as any adhesive layers or other mounting structures, are preferably hidden from view such that the

shades

202a and 202b are only visible when at least partially unfolded.

The fully rolled shade is preferably about 1mm to 5mm in diameter, but may be greater than 5mm in certain exemplary embodiments. Preferably, the rolled shade has a diameter no greater than the width of the gap 108, which is typically about 10mm-25mm (sometimes 10mm-15 mm) to help facilitate quick and repeated unrolling and rolling operations. Although two

shades

202a and 202b are shown in the example of fig. 2, it should be understood that only one shade may be provided in certain exemplary embodiments, and it should also be understood that the one shade may be provided on an inner surface of the inner substrate 102 or the outer substrate 104. In exemplary embodiments where two shades are present, the combined diameter is preferably no greater than the width of the gap 108, for example, to facilitate the spreading and rolling operations of the two shades.

An electronic controller may be provided to assist in driving the

shades

202a and 202b. The electronic controller may be electrically connected to the

shades

202a and 202b and the

substrates

102 and 104, for example, via suitable leads or the like. With the assembled IG unit, the leads may be obscured from view. The electronic controller is configured to provide an output voltage to the

shades

202a and 202b relative to the conductive layers in the

substrates

102 and 104, respectively. In certain exemplary embodiments, an output voltage in the range of about 100V-600V DC may be used to drive the

shades

202a and 202b. In this regard, an external AC or DC power source, a DC battery, or the like may be used. It should be appreciated that higher or lower output voltages may be provided, for example, depending on manufacturing parameters and materials comprising the layers on the

shields

202a and 202b,

substrates

102 and 104, and the like.

The controller may be coupled to a manual switch, a remote (e.g., wireless) control, or other input device, for example, to indicate whether

shades

202a and 202b should be retracted or extended. In certain exemplary embodiments, the electronic controller can include a processor operably coupled to a memory that stores instructions for receiving and decoding control signals that, in turn, cause selective application of voltages to control extension and/or retraction of

shades

202a and 202b. Additional instructions may be provided so that other functions may be implemented. For example, a timer may be provided such that

shades

202a and 202b may be programmed to extend and retract at a user-specified time or other time, a temperature sensor may be provided such that

shades

202a and 202b may be programmed to extend and retract upon reaching a user-specified indoor temperature and/or outdoor temperature, a light sensor may be provided such that

shades

202a and 202b may be programmed to extend and retract based on an amount of light outside of the structure, and so forth.

Although two

shades

202a and 202b are shown in fig. 2, as described above, certain exemplary embodiments may incorporate only a single shade. Further, as described above, such shades may be designed to extend vertically and horizontally along and across substantially the entire IG unit, and various exemplary embodiments may relate to shades that cover only the portion of the IG unit in which they are disposed. In such cases, multiple shades may be provided to provide more selectable coverage, to account for internal or external structures (such as muntin bars), simulated plantations shutters, and the like. As another example, a first shade may cover a first portion (e.g., top or left/right portion) of a window and a second shade may cover a second portion (e.g., bottom or right/left) of the window. As another example, the first shade, the second shade, and the third shade may be provided to cover different approximately one third portions of a given window.

In certain exemplary embodiments, a locking constraint may be provided at the bottom of the IGU, for example, along part or all of its width, to help prevent the shade from spreading out over its entire length. The locking constraint may be made of a conductive material, such as metal. The locking constraint may also be coated with a low dissipation factor polymer such as polypropylene, fluorinated Ethylene Propylene (FEP), polytetrafluoroethylene (PTFE), or the like.

Exemplary details of the operation of the

shades

202a and 202b will now be provided in connection with fig. 3-4. More specifically, FIG. 3 is a cross-sectional view illustrating an exemplary "on-glass" component of the exemplary IGU from FIG. 2 that enables shutter actuation in accordance with certain exemplary embodiments; and FIG. 4 is a cross-sectional view of an exemplary shutter from the exemplary IGU of FIG. 2, according to certain exemplary embodiments. Fig. 3 shows a glass substrate 302 that may be used for either or both of the

substrates

102 and 104 in fig. 2. The glass substrate 302 supports the upper glass member 304 and the shutter 312. In certain exemplary embodiments, when deployed, the conductor 404 may be closer to the substrate 302 than the ink layer 406. In other exemplary embodiments, this arrangement may be reversed such that, for example, when deployed, conductor 404 may be farther from substrate 302 than ink layer 406.

The upper glass component 304 includes a transparent conductor 306 and a dielectric material 308, which may be attached to the substrate 302 via a transparent, low haze adhesive 310, or the like. These materials are preferably substantially transparent. In certain exemplary embodiments, the transparent conductor 306 is electrically connected to leads to the controller via terminals. In certain exemplary embodiments, transparent conductor 306 serves as a fixed electrode of the capacitor and dielectric material 308 serves as a dielectric of the capacitor. In such cases, a dielectric film or insulator film is disposed directly or indirectly on the first conductive layer, wherein the dielectric film or insulator film is separate from the shutter.

It should be appreciated that in certain exemplary embodiments, all of these dielectric layers may be placed on the shade, exposing a bare conductive (flat) substrate, such as a glass substrate supporting a conductive coating. For example, in certain exemplary embodiments, the polymer film insulator 308 may be disposed on/integrated as part of the shutter 312, rather than on/integrated as part of the substrate 302. That is, the shutter 312 may further support a dielectric or insulator film 308 thereon such that when the at least one polymeric substrate is in the shutter closed position and the shutter is extended, the dielectric or insulator film is in direct physical contact with the first conductive layer without other layers therebetween.

Transparent conductor 306 can be formed of any suitable material, such as ITO, tin oxide (e.g., snO ₂ Or other suitable stoichiometry), etc. In certain exemplary embodiments, the transparent conductor 306 may have a thickness of 10nm to 500nm. In certain exemplary embodiments, the dielectric material 308 may be a low dissipation factor polymer. Suitable materials include, for example, polypropylene, FEP, PTFE, polyethylene terephthalate (PET), polyimide (PI), polyethylene naphthalate (PEN), and the like. In certain exemplary embodiments, the dielectric material 308 may have a thickness of 1 micron to 30 microns (e.g., 4 microns to 25 microns). The thickness of the dielectric material 308 may be selected so as to balance the reliability of the shade with the amount of voltage (e.g., because thinner dielectric layers generally reduce reliability, while thicker dielectric layers generally require higher applied voltages for operational purposes).

It is well known that many low emissivity (low E) coatings are electrically conductive. Thus, in certain exemplary embodiments, a low E coating may be used in place of the transparent conductor 306 in certain exemplary embodiments. The low-E coating may be a silver-based low-E coating, for example, wherein one, two, three, or more layers comprising Ag may be sandwiched between dielectric layers. In such cases, the need for adhesive 310 may be reduced or eliminated entirely.

Shutter 312 may include an elastic layer 402. In certain exemplary embodiments, conductors 404 may be used on one side of the elastic layer 402, and optionally decorative ink 406 may be applied to the other side. In certain exemplary embodiments, the conductor 404 may be transparent and, as indicated, the decorative ink 406 is optional. In certain exemplary embodiments, the conductors 404 and/or the decorative ink 406 may be translucent or otherwise impart a colored or aesthetic characteristic to the shutter 312. In certain exemplary embodiments, the elastic layer 402 may be formed of a shrinkable polymer, such as PEN, PET, polyphenylene sulfide (PPS), polyetheretherketone (PEEK), and the like. In certain exemplary embodiments, the elastic layer 402 may have a thickness of 1 micron to 25 microns. In various exemplary embodiments, conductor 404 may be formed of the same or a different material than that used for conductor 306. For example, a metal or metal oxide material may be used. In certain exemplary embodiments, 10nm-50nm thick materials may be used that include layers including, for example, ITO, al, ni, niCr, tin oxide, and the like. In certain exemplary embodiments, the sheet resistance of the conductor 404 may be in the range of 40 ohms/square to 200 ohms/square. It should be appreciated that different conductivity values and/or thicknesses (e.g., the exemplary thicknesses listed in the following table) may be used in different exemplary embodiments.

Decorative ink 406 may include pigments, particles, and/or other materials that selectively reflect and/or absorb desired visible colors and/or infrared radiation. In certain example implementations, additional decorative ink may be applied to the shutter 312 on the opposite side of the conductor 404 from the elastic layer 402.

As shown in fig. 2, the

shades

202a and 202b are typically wound into a spiral roll, with the outer ends of the spirals attached to the substrates 102 and 104 (e.g., or dielectrics thereon) by an adhesive. The conductor 404 may be electrically connected to a lead wire or the like via a terminal, and may serve as a variable electrode of a capacitor having the conductor 306 as its fixed electrode and the dielectric 308 as its dielectric.

When an electrical drive is provided between the variable and fixed electrodes, such as when an electrical drive of voltage or charge or current is applied between conductor 404 of shutter 312 and conductor 306 on substrate 302, the electrostatic force created via the potential difference between the two electrodes pulls shutter 312 toward substrate 302. Pulling on the variable electrode causes the coiled shade to unroll. Electrostatic forces on the variable electrodes cause the shutter 312 to be held firmly against the fixed electrode of the substrate 302. Thus, the ink coating 406 of the shade, by being interposed in the optical path through the IG unit, helps to selectively reflect or absorb certain visible colors and/or infrared radiation. In this manner, the unrolled shade helps control radiation transmission by selectively blocking and/or reflecting some light or other radiation from passing through the IG unit, and thereby changing the overall function of the IG unit from transmitting to partially transmitting or selectively transmitting, or in some cases even opaque.

When the electrical drive between the variable electrode and the fixed electrode is removed, the electrostatic force on the variable electrode is also removed. The spring constants present in the elastic layer 402 and the conductor 404 cause the shade to roll back to its original tightly wound position. Because the movement of the shade is controlled by the primary capacitive circuit, current flows substantially only when the shade is unrolled or rolled up. Therefore, the average power consumption of the shade is extremely low. In this way, at least in some cases, standard AA batteries may be used to operate the shade for years.

In one example, substrate 302 may be a 3mm thick transparent glass commercially available from the assignee. An acrylic adhesive having low haze may be used for the adhesive layer 310. Sputtered ITO having a resistance of 100-300 ohms/square may be used for conductor 306. The polymer film may be a low haze (e.g., < 1% haze) PET material that is 12 microns thick. PVC-based inks commercially available from Sun Chemical Co (Sun Chemical Inc.) applied to a thickness of 3 microns to 8 microns can be used as decorative ink 406. PEN materials commercially available from DuPont (DuPont) that are 6 microns, 12 microns, or 25 microns thick may be used as the resilient layer 402. For opaque conductors, evaporated Al with a nominal thickness of 375nm may be used. For the transparent option, sputtered ITO may be used. In both cases, the sheet resistance may be 100 ohms/square to 400 ohms/square. (if aluminum is used, the sheet resistance may be less than 100 ohms/square; in certain exemplary embodiments, the sheet resistance may even be less than 1 ohm/square.) in certain exemplary embodiments, ITO or other conductive material may be sputtered or otherwise formed on its corresponding polymer carrier layer. Of course, these exemplary materials, thicknesses, electrical characteristics, and various combinations and sub-combinations thereof, etc. should not be considered limiting unless specifically claimed.

It will be appreciated from the above description that the dynamic shade mechanism uses a coiled polymer with a conductive layer. In certain exemplary embodiments, the conductor may be formed integral with the polymer 402, or it may be an external coating applied, deposited, or otherwise formed on the polymer 402. As also described above, the decorative ink 406 may be used with a transparent conductor material (e.g., ITO-based) and/or a conductive layer that is only partially transparent or opaque. In certain exemplary embodiments, an opaque or only partially transparent conductive layer may eliminate the need for ink. In this regard, a metal or substantially metal material may be used in certain exemplary embodiments. Aluminum is one exemplary material that may or may not be used with decorative ink.

One or more overcoat layers are provided over the conductors to help reduce visible light reflection and/or change the color of the shade to provide a more aesthetically pleasing product, and/or by "splitting" the conductors such that a phase shifter layer is present therebetween. An outer cover may be included to improve the aesthetic appearance of the overall shade. Thus, shutter 312 may include an anti-reflective overcoat, a dielectric mirror overcoat, and the like. Such antireflective overcoats and dielectric mirror overcoats may be disposed over the conductor 404 and on a major surface of the shade polymer 402 including, for example, PEN opposite the decorative ink 406. However, it should be understood that ink 406 need not be provided, for example, if conductor 404 is not transparent. A specular coating such as Al may eliminate the need for decorative ink 406. It should also be appreciated that in certain exemplary embodiments, an antireflective overcoat and a dielectric mirror overcoat may be disposed on a major surface of the light barrier polymer 402 comprising PEN, for example, opposite the conductors 404.

In addition to or instead of using optical interference techniques to reduce reflection, textured surfaces may be added to the matrix polymer to chemically or physically modify the conductive layer, and/or to add ink layers, e.g., to achieve the same or similar results, to achieve further reduction of unwanted reflection, etc.

In view of the fact that the film and/or other materials comprising the shutter should undergo multiple rolling and unrolling operations depending on the function of the unitary shade, it should be appreciated that the materials may be selected and formed into a unitary layer stack to have mechanical and/or other properties that facilitate it. For example, excessive stress in the film layer stack is generally considered to be detrimental. However, in some cases, excessive stress may cause cracking, "delamination"/removal, and/or other damage to the conductor 404 and/or one or more of the overcoat layers formed thereon. Thus, in certain exemplary embodiments, low stress (and in particular low tensile stress) may be particularly desirable in combination with layers formed on the polymer base of the shutter.

In this regard, the adhesion of the sputtered film depends, among other things, on the stress in the deposited film. One way in which the stress may be adjusted is by using deposition pressure. The stress does not follow a monotonic curve for the sputtering pressure, but rather changes at a transition pressure that is substantially unique for each material and is a function of the ratio of the evaporation temperature (or melting temperature) of the material to the substrate temperature. Stress engineering can be achieved via gas pressure optimization, bearing in mind these leads.

Other physical and mechanical properties of the shade that may be considered include the modulus of elasticity of the polymer and the layer formed thereon, the density ratio of the layers (which may have an effect on stress/strain), and the like. These characteristics may be balanced with their effect on internal reflection, conductivity, etc.

It is well known that the temperature inside an IG unit can become quite high. For example, it has been observed that an IG unit according to the example of fig. 2 and comprising black pigment may reach a temperature of 87 ℃, e.g., if the black portion of the shade faces the sun in high temperature, high solar radiation climates (e.g., in regions of the united states southwest such as arizona). The use of PEN materials for rollable/non-rollable polymers may be advantageous because PEN has a higher glass transition temperature (-120 ℃) compared to other common polymers such as PET (tg=67 ℃ -81 ℃), polypropylene or PP (tg= -32 ℃). However, if PEN is exposed to temperatures near the glass transition temperature, other advantageous mechanical properties of the material (including its elastic modulus, yield strength, tensile strength, stress relaxation modulus, etc.) may deteriorate over time, especially if exposed to high temperatures. If these mechanical properties degrade significantly, the shade may no longer function (e.g., the shade will not retract).

To help the shade better withstand high temperature environments, it may be advantageous to replace PEN with a polymer having better high temperature resistance. Two possible polymers include PEEK and polyimide (PI or Kapton). The Tg of PEEK is-142℃and the Tg of Kapton HN is-380 ℃. These two materials have better mechanical properties in high temperature environments than PEN. This is especially true at temperatures above 100 ℃. This is illustrated in the following chart, which refers to the mechanical properties of PEN (Teonex), PEEK and PI (Kapton HN). UTS stands for ultimate tensile strength in the graph.

		PEN	PEEK	PI
					25℃	UTS(psi)	39,000	16,000	33,500
	Modulus (psi)	880,000	520,000	370,000
						Yield (psi)	17,500		10,000
200℃	UTS(psi)	13,000	8,000	20,000
						Modulus (psi)			290,000
	Yield (psi)	＜1,000		6,000
					Tg		About 121 DEG C	About 143 DEG C	About 380 DEG C

It will be appreciated that modification of the shade matrix material from its current material (PEN) to an alternative polymer with increased high temperature mechanical properties (e.g., PEEK or Pl/Kapton) may be advantageous because it may enable the shade to better withstand internal IG temperatures, especially if the shade is installed in higher temperature climates. It should be appreciated that in certain exemplary embodiments, the use of alternative polymers may be used in conjunction with the shutter and/or upper glass layer.

Additionally or alternatively, certain exemplary embodiments may use dyed polymeric materials. For example, dyed PEN, PEEK, PI/Kapton or other polymers may be used to create shades having various colors and/or aesthetics. For example, dyed polymers may be advantageous for embodiments in transparent/translucent applications, e.g., where the shade conductive layer is a transparent conductive coating or the like.

Alternative conductive materials may be used which advantageously modify the spring force of the coiled shade to make it available for use in various lengths. In this regard, the characteristics of the conductive layer that increase the strength of the coil include an increase in the modulus of elasticity, an increase in the Coefficient of Thermal Expansion (CTE) difference between the polymer substrate and the conductive layer, and an increase in the ratio of modulus of elasticity to density. Some of the pure metals that may be used to increase coil strength compared to Al or Cr include Ni, W, mo, ti and Ta. The elastic modulus of the metal layer studied was in the range of 70GPa for Al to 330GPa for Mo. The CTE of the metal layer studied was 23.5X10 of Al ^-6 4.8X10 of/k to Mo ^-6 In the range of/k. Generally, the higher the modulus of elasticity, the greater the CTE mismatch between PEN or other polymer and metal, the lower the density, etc., the better the choice of material in terms of coil formation. It has been found that incorporating Mo and Ti based conductive layers into the shade has resulted in a coil with a spring force that is significantly higher than achievable with Al. For example, PEN, PEEK, PI based polymers and the likeThe substrate may support (in order of moving away from the substrate) a layer comprising Al followed by a layer comprising Mo. A thin film layer in a conductive coating having a greater modulus and lower CTE than Al and/or the conductive coating itself may be provided.

PEN, PI or other polymer substrates used as shutters may support a thin layer comprising Al on which a conductive layer comprising Mo, ti, etc. is present, either directly or indirectly, for stress engineering purposes. The conductive layer may support a corrosion resistant layer comprising Al, ti, stainless steel, or the like. The side of the substrate opposite the layers optionally may support decorative ink or the like.

Fig. 5 is a plan view of a substrate 102 incorporating an on-glass component 304 from the example of fig. 3 and a shutter component 312 from the example of fig. 4, according to some example embodiments. When moved to the shutter closed position, the shutter 312 extends from the anchor rod 502 toward the stop 504. When moved to the shutter open position, the shutter retracts from the stop 504 toward the anchor rod 502.

Certain exemplary embodiments can include microscopic perforations or through-holes that allow light to pass through the shade and provide a gradual amount of solar transmission based on the angle of the sun.

Further details and alternatives may be implemented. See, for example, U.S. patent 8,982,441;8,736,938;8,134,112;8,035,075;7,705,826 and 7,645,977, and U.S. application Ser. No. 16/028,546 filed on 7/6/2018, the entire contents of each of which are hereby incorporated by reference. Among other things, perforation configurations, polymeric materials, conductive coating designs, stress engineering concepts, building Integrated Photovoltaic (BIPV), and other details are disclosed therein, and at least those teachings may be incorporated into certain exemplary embodiments.

As will be appreciated from the above description, one problem associated with dynamic shutter designs relates to the formation of retractable shutters. In particular, care may be taken to select and implement a material having a spring force sufficient to enable automatic retraction over time. It will often be important to tightly control the manufacturing parameters to ensure that the shutter is properly generated so as to have a spring force sufficient for retraction, and to ensure that the spring force remains sufficient to cause retraction over the service life of the window or other product in which the shutter is integrated. If the spring constant is insufficient, or if the spring constant decreases over time, the shutter may become "stuck" in the extended or partially extended position. This may be the case even if no voltage is applied, simply because the spring constant will be insufficient to cause re-rolling. Furthermore, even if the spring constant is properly formed and remains high enough to provide retraction over time, at least theoretically, static charge can build up after repeated use. Such charge accumulation may cause the shutter to become "stuck" in an extended position or partially extended position in a similar manner as above, even when power is not provided. In this context it is meant that "pole-changing" which may hinder the operation of the shutter and which may be considered a natural phenomenon related to surface charge (on the dielectric surface) or semi-permanent electrostatic polarization (in the dielectric volume) may also hinder the operation of the shutter. And due to the closed system it may be difficult and sometimes even impossible to repair and/or replace a malfunctioning shutter and/or a shutter that has "worn out" over time, a system in which excess charge has accumulated and/or has been extremely switched, etc.

In certain exemplary embodiments, one potential may be used to help extend the shutter in one direction and another potential may be used to retract the shutter in another direction opposite the first direction. For example, the shutter may be designed with a layer stack such that the circuitry connected thereto may be able to selectively switch between providing a downward force and providing an upward force. As will be described in more detail below, an electric field may be provided to facilitate retraction. In certain exemplary embodiments, an electric field may be established to simply cause retraction (e.g., in the case of a shutter being stuck). In certain exemplary embodiments, the electric field may be established for the entire retraction operation.

In this way, certain example embodiments may help address pole changing and charge accumulation issues while also providing a way to combat aging and degradation of springs over time (e.g., thereby promoting durability and enhancing longevity). In addition or in the alternative, certain exemplary embodiments enable the use of materials with lower spring constants, as these techniques may be used to simply "force" a small amount of wrap at the beginning of retraction and/or wrap one or more times at the end of retraction. This may also be advantageous because manufacturing tolerances may be relaxed and ease of manufacturing may be facilitated.

Certain exemplary embodiments provide a dynamic shade having alternating conductive and dielectric layers. For example, in certain exemplary embodiments, at least four layers alternating between a conductive layer and a dielectric layer may be provided. When the shade is partially curled (e.g., a portion of the shade remains flat), the conductive layers are separated from each other by the dielectric layer. A voltage applied between the conductive layers generates an electric field that attracts the curled portion to the flat portion, thereby retracting the shade.

Fig. 6 is a schematic diagram of a first exemplary shade 602 having electrostatic retraction features implemented using two independent voltage sources 604a-604b according to certain exemplary embodiments. In fig. 6, the shade polymer is omitted for clarity. The two voltage sources 604a-604b are independently controllable. The first voltage source provides a common function as a standard shade. In fig. 6, the first voltage source 604a is shown as a lower voltage sign with its negative terminal connected to a back plate conductor, which may be the conductor 306 located below the dielectric 308 in the upper glass part 304 (e.g., described in connection with fig. 3). In normal operation, this is a variable source whose polarity and voltage can be reversed.

The second voltage source actuates a reverse roll-up force. In fig. 6, the second voltage source 604b is shown as an upper voltage sign. Increasing the potential difference of the second voltage source 604b creates an electric field E between the first conductive layer 606a and the second conductive layer 606b on the rollable shutter. The first conductive layer 606a and the second conductive layer 606b are separated by a first dielectric layer 608a and a second dielectric layer 608b, as will be appreciated from the above. The resulting torque T acts counter-clockwise to produce a force F acting to the left (in this schematic and in this exemplary orientation). It will be appreciated that in operation, the resulting torque acts in a roll-up direction opposite the extension (typically counterclockwise for vertical and substantially vertical installations), which generates a force that acts toward the retracted position (typically top for vertical and substantially vertical installations). Of course, it should be appreciated that the torque will depend in part on the viewing angle. For example, if the shade extends to the left, or if the same shade is viewed from the opposite edge, torque occurs clockwise.

Fig. 7 is a schematic diagram of a second exemplary shade 702 having an electrostatic retraction feature implemented using a voltage source according to certain exemplary embodiments. In fig. 7, the light-shielding polymer is omitted for clarity. The shade 702 of fig. 7 is similar to the shade 602 of fig. 6. As described above, increasing the potential difference generates an electric field E between the first conductive layer 606a and the second conductive layer 606b on the rollable shutter. The first conductive layer 606a and the second conductive layer 606b are separated by a first dielectric layer 608a and a second dielectric layer 608 b. The resulting torque T produces a force F that acts to urge the shutter to retract as a whole. Fig. 7 differs from fig. 6 in the control circuit 704 used. For example, in certain exemplary embodiments, a two-phase H-bridge having series connected inductors may be extended and generalized to include a third electrode, thereby forming a three-phase bridge. The three-phase bridge circuit may be implemented using low cost gate driver technology commonly used in high voltage motor controllers, such as used in the hybrid automotive industry. The circuit 704 includes three individually connected inductors in series with each bridge output terminal to achieve high efficiency energy recovery.

As noted above, 100V-600V DC is suitable for extension in most applications, and the same or similar ranges may be used for retraction. In certain exemplary embodiments, the voltage output of the bridge output terminals may be maintained anywhere between the + -supply voltages by appropriate constraints on the current. In certain exemplary embodiments, an appropriate Pulse Width Modulation (PWM) waveform may be used. In this regard, PWM typically requires voltage and/or current measurements to provide a feedback signal in the control loop. It should be appreciated that one skilled in the art can determine the exact duty cycle and duration. In certain exemplary embodiments, a two-phase "H-bridge" or a three-phase bridge may be considered advantageous over, for example, the circuit of fig. 6, because only a single voltage source is required.

As described above, shutter 312 may include a biaxially oriented polymer-based layer (e.g., of PEN or the like or containing PEN or the like). The polymer-based layer may be coated with a metallic conductor on one side followed by an ink coating on one or both sides. In this configuration, both the ink layer and the polymer-based layer act as dielectrics.

Fig. 8 is a cross-sectional view of a first shutter 312' that may be used in conjunction with electrostatic retraction, according to certain example embodiments. The shutter 312' for use with electrostatic retraction may have alternating conductive and dielectric layers, as described above. For example, as shown in fig. 6 and 7, in certain exemplary embodiments, four layers may be provided as minimal (in addition to the opacifying polymer layer).

The shutter 312' for use with electrostatic retraction according to fig. 8 may be constructed by adjusting or changing the example of fig. 4. For example, in certain exemplary embodiments, both sides of the polymer-based layer 402 (e.g., PEN or PEN-containing) may be coated with a metal or other conductive coating, followed by an ink coating disposed on one or both sides. In certain exemplary embodiments, providing ink on both sides may help to create a more desirable aesthetic appearance, as the shade will not have a glossy metallic appearance when viewed from either side of the shade. Thus, in fig. 8, a first conductive (e.g., metal) layer 606a and a second conductive (e.g., metal) layer 606b sandwich the polymer-based layer 402, and a first dielectric (e.g., ink) layer 608a and a second dielectric (e.g., ink) layer 608b sandwich the polymer-based layer 402. As shown in fig. 8, the first dielectric layer 608a and the second dielectric layer 608b are disposed on surfaces opposite surfaces of the first conductive layer 606a and the second conductive layer 606b adjacent to the polymer-based layer 402.

Exemplary thicknesses of the layers are provided in the following table:

layer/material	Preferred thickness of	More preferred thickness	Exemplary thickness
				Printing ink (608 a)	1μm-10μm	2μm-5μm	2μm
Aluminum (606 a)	100nm-600nm	200nm-450nm	300nm
				PEN(402)	5μm-100μm	5μm-25μm	12μm
Aluminum (606 b)	5nm-100nm	20nm-75nm	50nm
				Printing ink (608 b)	1μm-10μm	2μm-5μm	2μm

Typically, when aluminum is used for layer 606b, it is desirable to use a thickness of at least 30nm to achieve good electrical contact. It should be appreciated that in certain exemplary embodiments, the ink itself may be formulated for conductivity. In some of such cases, one conductive layer (e.g., layer 606b comprising aluminum) may be replaced with a conductive ink, e.g., essentially combining

layers

606b and 608b into a single layer.

In certain exemplary embodiments, the ink layers have the same thickness (e.g., 2 μm). Although different inks and/or colors vary in opacity, a 2 μm thickness is typically about the minimum necessary to produce an opaque coating. The opacifying polymer (e.g., PEN) layer and the aluminum or aluminum-containing first conductive layer may be standard thicknesses of the shutter lacking an electrostatic retraction function. The aluminum or aluminum-containing "added" second conductive layer may be provided at a thickness less than the thickness of the aluminum or aluminum-containing first conductive layer. This may be desirable in certain exemplary embodiments to help reduce variations in mechanical properties relative to the shade. For example, good shades that are less prone to cracking or delamination and have good spring constants can be achieved. In certain exemplary embodiments, such a thickness arrangement has been found to be advantageous in helping to maintain compatibility with the thermal process used to form the shade, including, for example, processing flat materials to create curls.

Fig. 9 is a cross-sectional view of a second shutter 312 "that may be used in conjunction with electrostatic retraction, according to certain example embodiments. In certain exemplary embodiments, the exemplary embodiment of fig. 9 may be produced by differential tension lamination. For example, two (or more) main components may be manufactured. The first component may include a first polymer-based layer 902a (of or including PET, PEN, etc.). The first polymer-based layer 902a supports a first dielectric (e.g., ink) layer 608a and a first conductive (e.g., metal) layer 606a on opposite major surfaces thereof. In a similar manner, the second component may include a second polymer-based layer 902b (of or including PET, PEN, etc.). The second polymer-based layer 902b supports a second dielectric (e.g., ink) layer 608b and a second conductive (e.g., metal) layer 606b on opposite major surfaces thereof.

A mechanical spring force is generated under differential tension between the first conductive layer 902a and the second conductive layer 902b (which may have or include metal, as described above). A layer 904 of Pressure Sensitive Adhesive (PSA) or "glue" connects the two components together. In addition, glue 904 acts as a dielectric to separate first conductive layer 902a from second conductive layer 902b. In addition or in the alternative, thermal bonding may be used in certain exemplary embodiments. In this regard, polyethylene (e.g., LDPE) may be bonded without the addition of an adhesive at an appropriate temperature compatible with other processing operations. In this example, the electrostatic retraction is caused by an electric field acting through the two ink layers 608a-608b and the two PET layers 902a-902 b.

Exemplary thicknesses of the layers are provided in the following table:

layer/material	Preferred thickness of	More preferred thickness	Exemplary thickness
				Printing ink (608 a)	1μm-10μm	2μm-5μm	2μm
PEN(902a)	1μm-50μm	2μm-25μm	5μm
				Aluminum (606 a)	100nm-600nm	200nm-450nm	300nm
PSA glue (904)	5μm-100μm	5μm-25μm	12μm
				Aluminum (606 b)	100nm-600nm	200nm-450nm	300nm
PET(902b)	1μm-50μm	2μm-25μm	5μm
				Printing ink (608 b)	1μm-10μm	2μm-5μm	2μm

In certain exemplary embodiments, different materials may be used for the conductive (e.g., metal)

layers including layers

606a and 606b including aluminum in the above tables, and/or different materials may be used for the polymer (e.g., PET)

layers including layers

902a and 902b including PET in the above tables. For example, PET, PEN, or the like may be used. In certain exemplary embodiments, the order of the conductive layer and the polymer layer may be reversed. For example, the following layer order may be used in certain exemplary embodiments: ink/conductive (e.g., metal) layer/polymer/(optional) gum/polymer conductive (e.g., metal) layer/ink. Such an arrangement is illustrated in fig. 10, and fig. 10 is a cross-sectional view of a third shutter 312' "that may be used in connection with electrostatic retraction in accordance with certain exemplary embodiments. In certain exemplary embodiments, this arrangement may be advantageous because it helps to increase the effective thickness of the dielectric separating the two conductive layers. This will reduce the fixed value capacitance that will not contribute to retractive force, but requires energy to charge. The same or similar thickness may be used in such an arrangement.

The total effective dielectric thickness includes the ink layer as well as the PET layer, plus any entrained air thickness. In certain exemplary embodiments, the thickness may be 4 μm to 120 μm, more preferably 8 μm to 60 μm, exemplified by 14 μm. In certain exemplary embodiments, the thicknesses of the first ink layer and the second ink layer may be the same or substantially the same. In certain exemplary embodiments, the thicknesses of the first and second PET layers may be the same or substantially the same. In certain exemplary embodiments, the thicknesses of the first conductive (e.g., metallic aluminum or other material) layer and the second conductive (e.g., metallic aluminum or other material) layer may be the same or substantially the same. In this case, "substantially the same" means a thickness variation of not more than 15%, more preferably not more than 10%. At least in some cases, having a common thickness is useful herein. For heat treated shades having equal aluminum thicknesses, the stresses in the aluminum layers will cancel each other out to result in, for example, a very weak shade. Typically, the compressive forces in a single aluminum layer will be offset by the tensile forces in a polymer (e.g., PEN) layer. )

Although the examples discussed in connection with fig. 8-9 list several candidate materials for the conductive layer and the polymer-based layer, it should be understood that any of the materials described herein (and/or other suitable materials) may be used in place of or in addition to those materials. For example, in certain exemplary embodiments, the conductive layer may have or comprise Al, cu, mo, ti, niCr, or the like. Copper has been found to be advantageous because copper includes the high elasticity (elastic energy storage at yield stress) of the available metal coatings, and the maximum shade length has been found to be directly related to elasticity. For high performance, for example, an interleaved structure of aluminum and 60nm copper can be achieved, and a high level of elasticity can be provided. In certain exemplary embodiments, the polymer-based layer can have or comprise PEN, PET, PI, or the like. Although a pressure sensitive adhesive has been described, it should be understood that other materials may be used to join polymer-based materials and/or other materials together. For example, laminates and other adhesives may be used.

An advantage of the electrostatic retraction concepts described herein is that the electric field increases the pressure between the shade windings. This pressure increases the normal force between the layers and increases the inter-winding friction. If the static friction between the windings is high enough, the windings cannot slide over each other. Without sliding, the shade will follow a straight line direction and will prevent telescoping and deflection. Thus, certain example embodiments are advantageous in that they reduce the likelihood of (and sometimes prevent) deflection and/or telescoping.

In certain exemplary embodiments, the on-voltage may be applied and maintained until the shade is fully retracted. In certain exemplary embodiments, a voltage can be provided to generate an electrostatic force for retraction at one or more predefined times and/or according to a timed pattern. For example, when retraction is triggered, a voltage can be provided to generate an electrostatic force for retraction immediately and at predefined time intervals (e.g., every 2-5 milliseconds). In certain exemplary embodiments, the voltage for retraction may be cycled on and off according to a predefined pattern until the shade is determined to be in its fully retracted position. The determination of full retraction may be made using optical means (e.g., scanning to determine whether the shade is rolled up at the top of the article or other desired location in which the shade is disposed), by triggering a manual actuator (e.g., by a roller achieving its full thickness induction), by electrical sensing (e.g., based on contact of a conductive layer with a bus bar or the like disposed at the top of the article or other desired location in which the shade is disposed), etc.

In certain exemplary embodiments, cycling can occur over a period of time (e.g., based on testing, etc.) in which shade retraction is expected. For example, if the shade is known or expected to fully retract within 10ms, 5 pulses may be provided at 2ms intervals to "force" full retraction.

Additionally or alternatively to providing fixed timing to the pulses to cause retraction, optics, mechanical actuators, electrical means, etc. may be used in a similar manner to that described above to determine whether to provide an "on demand" voltage to cause retraction. That is, these means may be provided to assist in determining whether the shutter is "stuck" in the extended or only partially retracted position. If it is determined that the shutter is stuck, a voltage may be generated to help facilitate torque associated with retracting the roll-up, whether or not a fixed timing is used.

As another option that may be used with the above, manual operation may trigger a voltage to cause retraction. This manual action may be prompted when a human user notices that the shutter is stuck, extended, etc.

Step-up transformers (e.g., flyback transformers), etc., may additionally or alternatively be incorporated into certain exemplary embodiments, e.g., to help further reduce the effects of pole changing. In this regard, the techniques set forth in U.S. application Ser. No. 16/947,014, filed 7/15/2020, may be used. The entire contents of the' 014 application is hereby incorporated by reference.

To help further reduce (and possibly even eliminate) the voltage required to hold the shade in the extended position, certain exemplary embodiments may utilize an improved latch stop lever, for example, in lieu of the locking constraint described above. The improved latch stop bar of certain exemplary embodiments in some cases enables the extended shade to retain very little stored energy. Further, the latch stop lever may help reduce or eliminate shock hazards, reduce power consumption, and increase battery life.

FIG. 11 is a schematic view of a portion of a dynamic shade system incorporating an electrostatic latch stop lever according to certain example embodiments. In fig. 11, the second substrate and spacer system are removed for ease of understanding. The elements of fig. 11 are similar to those shown and described above in connection with fig. 3. For example, the substrate 1102 supports an upper glass component 1104 that includes a first conductive coating 1106 supported by a first dielectric 1108. These on-glass components 1104 are coupled to the substrate 1102 via a transparent, low haze adhesive 1110. The same or similar materials as those described above may be used in conjunction with the upper glass member 1104. For example, the first conductive coating 1106 may include a layer comprising ITO, and the first dielectric 1108 may be a polymer film insulator, such as PET, or the like.

Shutter 1112 extends from anchor rod 1122 toward electrostatic latch stop rod 1124. In the schematic of fig. 11, shutter roller 1112a is shown as being nearly fully extended. Similar to fig. 4 and the related discussion, shutter 1112 includes layers including, in order of movement away from substrate 1102, an optional decorative ink layer, a second conductive coating supported by an opacifying polymer, and another optional decorative ink layer. The same or similar materials as those described above may be used in conjunction with shutter 1112. For example, the opacifying polymer may comprise PEN; the second conductive coating may comprise ITO, al, mo or another metal; etc.

While the designs shown and described in connection with fig. 3 and 4 may be used in certain exemplary embodiments, it should be understood that the designs shown and described in connection with fig. 8-10 may be used in connection with different exemplary embodiments. This may be useful where it is desired to achieve both a latch stop lever and a motorized retraction shutter.

Latch stop rod 1124 supports a dielectric material 1126 on a surface facing anchor rod 1122. The latch stop rod 1124 itself may include a relatively large conductive structure such as an aluminum extrusion, brass shims, or other conductors. The face of latch stop rod 1124 facing anchor rod 1122 may have a profile that helps to accommodate the shutter roller 1112a as it extends. As schematically shown in fig. 11, the profile is curved and generally complements the shape of the shutter roller 1112 a. In other words, shutter roller 1112a is generally circular when viewed in side cross-section and is received by a generally semicircular cross-section in the profile of latch stop rod 1124.

Dielectric material 1126 may include polymer-based materials, such as PI, PEN, PET, PMMA, and the like. In certain exemplary embodiments, PI tape (e.g., kapton tape) may be easily applied to the face of latch stop rod 1124 facing anchor rod 1122.

In certain exemplary embodiments, the latch stop rod 1124 is electrically isolated from the shade (including the upper glass member 1104, shutter 1112) and the anchor rod 1122. Unlike some current designs, the anchor rod 1122 and the latch stop rod 1124 are not electrically connected to each other. This design allows the latch stop lever 1124 to be energized individually.

In this sense, three separate electrodes are provided in the exemplary shade system of fig. 11. The first electrode is defined in conjunction with the upper glass member 1104. A second electrode is defined in combination with anchor 1122 and shutter 1112. The third electrode is defined to be coupled to the latch stop rod 1124. As alluded to above, in certain exemplary embodiments, each electrode may be activated individually.

It should be appreciated that it may be desirable to control anchor rod 1122 and shutter 1112 in common, for example, where a single voltage is provided to a single electrode. This is because anchor rod 1122 provides a large amount of "real estate" and makes it easier to make electrical connections, for example, the shutter may be very small, rolled up, and not have too much surface area for making electrical connections, as compared to shutter 1112. However, in certain exemplary embodiments, a separate fourth electrode is defined in conjunction with anchor rod 1122. In such cases, voltages may be applied to anchor rod 1122 and shutter 1112 independently of each other.

Fig. 12 is a flow chart detailing the manner in which the shade system of fig. 11 is operable in certain exemplary embodiments. In step S1202, a voltage is applied to the anchor rod and the on-glass component. In this regard, the voltage ranges discussed above may be used. For most applications a voltage of 600V is suitable. The shutter is extended with the aid of electrostatic forces, as shown in step S1204. A first electrode and a second electrode are used in this respect.

If an electrostatic latch stop lever is not used, it is possible to at least slightly reduce the voltage once the shutter is fully extended and the on-glass dielectric (e.g., first dielectric 1108 in FIG. 11) is fully charged. For example, depending on the size of the window and shade, the temperature at which the entire system operates, etc., 20V-50V may be retracted if an electrostatic latch stop lever is not used.

In contrast, in certain exemplary embodiments, in step S1206, the dielectric on the latch stop lever is charged. Such charging may occur before, during and/or after the shutter extension referenced in step S1204. Charging continues until at least the dielectric on the latch stop lever is charged, as shown in step S1208. Preferably, both the dielectric on the latch stop lever and the dielectric on the glass are fully charged. In certain exemplary embodiments, the charging may be controlled such that the dielectric on the glass is fully charged before the dielectric on the latch stop lever is fully charged. In certain exemplary embodiments, the charging may be controlled such that the on-glass dielectric is fully charged before charging on the latch stop lever begins.

Once fully charged and the shutter fully extended, at least the voltage supplied to the on-glass component is reduced, e.g., in conjunction with the first electrode. In certain exemplary embodiments, the voltage supplied to the anchor rod may also be reduced, for example, in conjunction with the second electrode.

In certain exemplary embodiments, the voltage supplied to the upper glass part and the voltage supplied to the anchor rod are reduced simultaneously. In certain exemplary embodiments, the voltage supplied to the on-glass component is reduced before the voltage supplied to the anchor rod is reduced.

The voltage supplied to the electrostatic latch stop lever is reduced, although the extent of the reduction may not be as great as the reduction made with respect to the component on the glass. In some cases, the voltage level provided to the latch stop lever may be maintained or substantially maintained. Maintaining or substantially maintaining the voltage supplied to the electrostatic latch stop lever may be accomplished by providing a continuous voltage, or by only temporarily reducing the voltage applied thereto (e.g., slightly reducing the voltage and increasing the voltage again). Similarly, a partial reduction of the voltage supplied to the electrostatic latch stop lever may be performed by reducing the voltage applied thereto to a desired level independent of the voltage applied to other components, or by reducing the voltage of all components and then increasing the reverse voltage of the latch stop lever. In certain exemplary embodiments, the voltage provided to the on-glass component and/or the anchor rod is reduced and transferred to the latch stop rod.

The latter option is shown in the exemplary flow chart of fig. 12. That is, as shown in fig. 12, in step S1210, the voltages applied to the anchor rod, the glass upper member, and the stopper rod are reduced. Then, in step S1212, the voltage is applied back to the latch stop lever.

By way of example, in step S1210, the voltage applied to the entire circuit including the anchor rod, the on-glass component, and the latch rod stop may be reduced by 200V-300V. Then, as shown in step S1212, depending on factors such as the size of the window, the weight of the shutter, the operating temperature, etc., a voltage of 100V-150V may be added to the stopper via a separate circuit. The result in this example may involve providing 300V-400V on the window and 400V-450V to the stop.

Factors such as those described above may be used to determine the appropriate voltage levels and voltage level reductions for the various components. Generally, the voltage on the glass and the voltage on the anchor rod can be reduced by at least about 20% -25%, more preferably at least about 30%, and sometimes at most about 33.33% -50%. Generally, the latch stop lever voltage may be reduced by at least about 10%, more preferably at least about 20%, and sometimes about 25% -33%.

In some examples, a portion of the voltage applied to the anchor rod and/or the upper glass component may be redirected from the anchor rod and/or the upper glass component to the latch rod (e.g., in steps S1210 and S1212).

This may result in at least some minimal savings in operating costs and battery usage. However, because "pole changing" and charge accumulation may occur as discussed above, these seemingly minimal savings may become substantial because less energy is required to mitigate switching and accumulation (especially when no step-up transformer, such as a flyback transformer, etc., is implemented).

FIG. 13 is a schematic diagram of an exemplary system for controlling operation of shutter 1112 including latch stop lever 1124 according to certain exemplary embodiments. The exemplary system shown in fig. 13 includes a controller 1310 that includes circuitry configured to apply a voltage to an on-glass component of the shade 112, the anchor rod 1122, and/or the latch stop rod 1124. In certain exemplary embodiments, the control circuit 1310 may be configured to provide a voltage to the on-glass component of the shade 112, the anchor rod 1122, and/or the latch stop rod 1124 according to one or more operations discussed with reference to the flowchart shown in fig. 12.

The controller 1310 is coupled to the on-glass component of the shade 112, the anchor rod 1122, and/or the latch stop rod 1124. The controller may include a power supply 1320 and/or may be coupled to an external power supply. The power source 1320 may include AC and/or DC power (e.g., a DC battery and/or AC power for charging the DC battery). The controller 1310 is configured to independently apply voltages to the on-glass components of the shade 112, anchor rod 1122, and/or latch stop rod 1124 powered by a power source 1320, and to independently control the discharge of voltages applied to the on-glass components of the shutter 1112, anchor rod 1122, and/or latch stop rod 1124.

Fig. 14 illustrates an exemplary control circuit 1350 that may be part of the controller 1310 and used in connection with fig. 13 in accordance with certain exemplary embodiments. As shown in fig. 14, voltages from the power source 1320 are provided to different electrodes by controlling a pair of switches coupled between the respective electrodes and the power source 1320. An inductor may be connected in series between the switch and the electrode to achieve energy recovery during discharge.

As shown in fig. 14, a first pair of switches S1 and S2 are controlled to provide voltage to a first conductive layer of shutter 1112, a second pair of switches S3 and S4 are controlled to provide voltage to a second conductive layer of shutter 1112, a third pair of switches S5 and S6 are controlled to provide voltage to a conductor of upper glass component 1104, and a fourth pair of switches S7 and S8 are controlled to provide voltage to latch stop lever 1124. In certain exemplary embodiments, a multi-phase bridge circuit including low cost gate driver technology may be used to provide voltages to different electrodes.

In certain exemplary embodiments, the first pair of switches SI and S2 and the second pair of switches S3 and S4 may be controlled to provide voltages to the conductive layer in shutter 1112 and the conductive layer in upper glass component 1104. Providing a voltage to the conductive layer may create an electrostatic force to drive the flexible substrate of shutter 1112 toward the closed position. Switches S7 and S8 are controlled to provide a voltage to the conductive portion of latch stop lever 1124. Providing a voltage to the conductive portion of latch stop rod 1124 may create an electrostatic force to help electrostatically lock the flexible substrate of shutter 1112 to latch stop rod 1124.

Although not shown in fig. 14, in certain exemplary embodiments, an additional pair of switches and inductors may be included in control circuit 1350 to individually provide voltage to anchor 1122.

The control circuit 1350 allows for independent control of the charging and discharging of the different electrodes provided to the dynamic shade. The switch may be controlled to reduce the voltage applied to the anchor rod, window, and stopper rod and reapply the voltage to the latch stopper rod or other component of the dynamic shade.

As discussed above with reference to the flowchart in fig. 12, in certain exemplary embodiments, the voltages output to the different electrodes may be reduced and added back (see, e.g., steps S1210 and S1212). The control circuit 1350 allows for independent control of the charging and discharging of the different electrodes provided to the dynamic shade. The switch may be controlled to reduce the voltage applied to the anchor rod, window and stopper rod and reapply the voltage to the latch stopper rod or other component of the dynamic shade.

In certain exemplary embodiments, the voltage output to the electrodes may be reduced by appropriately constraining the current. In certain exemplary embodiments, an appropriate Pulse Width Modulation (PWM) waveform may be used. In this regard, PWM typically requires voltage and/or current measurements to provide a feedback signal in the control loop. It should be appreciated that one skilled in the art can determine the exact duty cycle and duration. The lowering and reapplying of the voltage is not limited thereto and may be performed by other techniques known to those skilled in the art, for example, by controlling the voltage provided by the power supply 1320.

While the description provided above implies a separate and independently controllable electrode design, any suitable circuit design may be used in connection with the different exemplary embodiments. For example, certain exemplary embodiments may use the same or similar circuit designs as used in connection with the techniques described above in connection with motorized retraction of the shutter. For example, an additional half-bridge output driving the latch stop lever electrode may be provided. The circuit may be a multi-phase (e.g., three-phase) push-pull circuit. If the latch stop lever and power retract were to be implemented in the same design, the circuit could be modified to include an additional half-bridge output stage (e.g., a fourth half-bridge output stage). In certain exemplary embodiments, the controller may include a pair of H-bridge circuits for controlling charging and discharging.

While certain exemplary embodiments are described in connection with an electrostatic latch stop lever, the use of the term "lever" should not be construed to represent any particular structure. In certain exemplary embodiments, the shape of the "stop" may be generally elongated. However, in various exemplary embodiments, the stop may include a plurality of stop segments. In certain exemplary embodiments, the shape of the stop as a whole may be generally rectangular; however, different shapes may be used in different exemplary embodiments. For example, as will be appreciated from the above description, the receiving portion may be defined on a surface of the stopper facing the anchor rod from which the shutter extends, and may be flat, substantially semi-circular, etc. Similar to that discussed above, although the term "rod" is used in conjunction with the term "anchor rod," it should be understood that "rod" as used herein does not generally refer to any particular shape of anchor rod.

The IG units described herein can incorporate a low E coating on any one or more of

surfaces

1, 2, 3, and 4. As described above, for example, such low E coatings may be used as conductive layers for opacifiers. In other exemplary embodiments, a low E coating may be provided on another interior surface in addition to the conductive layer that acts as a shade. For example, a low E coating may be provided on surface 2 and a shade may be provided with respect to surface 3. In another example, the positions of the shade and low E coating may be reversed. In either case, a separate low E coating may or may not be used to assist in handling the shade provided with respect to surface three. In certain exemplary embodiments, the low E coating disposed on

surfaces

2 and 3 may be a silver-based low E coating. Exemplary low E coatings are described in U.S. patent nos. 9,802,860; 8,557, 391;7,998, 320;7,771, 830;7,198, 851;7,189, 458;7,056, 588 and 6, 887, 575, the entire contents of each of which are hereby incorporated by reference. Low E coatings based on ITO or the like may be used for the interior and/or exterior surfaces. See, for example, U.S. Pat. nos. 9,695,085 and 9,670,092, the entire contents of each of which are hereby incorporated by reference. These low E coatings may be used in conjunction with certain exemplary embodiments.

An anti-reflective coating may also be provided on a major surface of the IG unit. In certain exemplary embodiments, an AR coating may be disposed on each major surface without the low E coating and opacifying disposed thereon. Exemplary AR coatings are described, for example, in U.S. patent nos. 9,796, 619 and 8,668,990 and U.S. publication No. 2014/0272314, the entire contents of each of which are hereby incorporated by reference. See also 9, 556, 066, the entire contents of which are hereby incorporated by reference. These AR coatings may be used in conjunction with certain exemplary embodiments.

The exemplary embodiments described herein may be incorporated into a variety of applications including, for example, interior and exterior windows for commercial and/or residential applications, skylights, doors, commercial devices such as refrigerators/freezers (e.g., for doors and/or "walls" thereof), vehicle applications, and the like.

While certain exemplary embodiments have been described in connection with an IG unit comprising two substrates, it should be understood that the techniques described herein may be applied with respect to so-called triple IG units. In such cells, the first, second, and third substantially parallel spaced apart substrates are separated by the first and second spacer systems, and the shade may be disposed adjacent to any one or more of the interior surfaces of the innermost and outermost substrates, and/or adjacent to one or both of the surfaces of the intermediate substrates.

While certain exemplary embodiments have been described as incorporating glass substrates (e.g., inner and outer panes for an IG unit described herein), it should be understood that other exemplary embodiments may incorporate non-glass substrates for one or both of such panes. For example, plastics, composite materials, etc. may be used. When glass substrates are used, such substrates may be heat treated (e.g., thermally strengthened and/or thermally tempered), chemically tempered, kept annealed, etc. In certain exemplary embodiments, the inner substrate or the outer substrate may be laminated to another substrate of the same or different material.

As used herein, unless explicitly stated otherwise, the terms "on," "supported by," and the like should not be construed as meaning that two elements are directly adjacent to each other. In other words, a first layer is said to be "on" or "supported by" a second layer even though there are one or more layers between them.

In addition to the features described in the previous paragraph, in certain exemplary embodiments, the stop may be an aluminum extrusion, a brass shim, or the like.

In addition to the features described in either of the two preceding paragraphs, in certain exemplary embodiments, the second dielectric layer may comprise polyimide.

In addition to the features described in any of the three preceding paragraphs, in certain exemplary embodiments, the first conductive layer may form part of a first electrode, the second conductive layer may form part of a second electrode, and the conductive portion of the stopper may form part of a third electrode, e.g., wherein the third electrode is electrically isolated from and controllable independently of the first and second conductive layers.

In addition to the features described in any of the four preceding paragraphs, in certain exemplary embodiments, the anchor-facing surface of the stop may be shaped to receive an end portion of the shutter when the shutter is extended to the shutter closed position.

In addition to the features described in the preceding paragraphs, in certain exemplary embodiments, the end portion of the shutter may be roller-shaped when the shutter is extended to the shutter closed position, and the anchor-facing surface of the stopper may include a bend for receiving the roller-shaped end portion of the shutter.

In addition to the features described in any of the first six paragraphs, in certain example embodiments, the control circuit may be further configured to provide a third voltage to the first conductive layer when the shutter is held in the shutter closed position, e.g., wherein the third voltage is lower than the first voltage.

In addition to the features described in the preceding paragraphs, in certain example embodiments, wherein the control circuit may be further configured to provide a fourth voltage to the conductive portion of the stopper when the shutter is held in the shutter closed position, e.g., wherein the fourth voltage is lower than the second voltage.

In addition to the features described in the previous paragraph, in certain exemplary embodiments, the fourth voltage may be higher than the third voltage.

In addition to the features described in any of the nine preceding paragraphs, in certain exemplary embodiments, the first voltage and the second voltage may be the same.

In addition to the features of any of the first 10 paragraphs, in certain example embodiments, the control circuit may include a first half-bridge circuit coupled between the first conductive layer and a power source, a second half-bridge circuit coupled between the second conductive layer and the power source, and a third half-bridge circuit coupled between the conductive portion of the stopper and the power source.

In addition to the features described in the previous paragraph, in certain exemplary embodiments, the first half-bridge circuit and the second half-bridge circuit may be controlled to provide the first voltage, and the third half-bridge circuit may be controlled to provide the second voltage.

In addition to the features of any of the first 12 paragraphs, in certain example embodiments, the control circuit may be configured to provide the second voltage to the conductive portion of the stopper after generating the first electrostatic force to drive the flexible substrate to the shutter closed position based on the first voltage.

In certain exemplary embodiments, a method of operating a dynamic shade in an Insulating Glass (IG) unit according to any one of the preceding 13 paragraphs is provided. The first voltage is provided to the first conductive layer and the second conductive layer to drive the flexible substrate to the shutter closed position. The second voltage is provided to the conductive portion of the stopper to thereby help electrostatically lock the flexible substrate to the stopper. Causing the flexible substrate to return to the shutter open position.

In addition to the features described in the preceding paragraph, in certain exemplary embodiments, a third voltage may be provided to the first conductive layer when the shutter is held in the shutter closed position, for example, wherein the third voltage is lower than the first voltage.

In addition to the features described in the preceding paragraphs, in certain exemplary embodiments, a fourth voltage may be provided to the conductive portion of the stopper when the shutter is held in the shutter closed position, for example, wherein the fourth voltage is lower than the second voltage.

In addition to the features described in either of the two preceding paragraphs, in certain exemplary embodiments, the first voltage and the second voltage may be the same.

In addition to the features described in any of the preceding five paragraphs, in certain exemplary embodiments, the stop may be an aluminum extrusion or a brass shim.

In addition to the features described in any of the first six paragraphs, in certain example embodiments, the first conductive layer may form part of a first electrode, the second conductive layer may form part of a second electrode, and the conductive portion of the stopper may form part of a third electrode, e.g., wherein the third electrode is electrically isolated from and controllable independently of the first and second conductive layers.

In addition to the features described in any of the preceding seven paragraphs, in certain exemplary embodiments, the anchor-facing surface of the stop may be shaped to receive an end portion of the shutter when the shutter is extended to the shutter closed position.

In addition to the features described in the preceding paragraphs, in certain exemplary embodiments, the anchor-facing surface of the stop may be shaped to receive an end portion of the shutter when the shutter is extended to the shutter closed position.

In addition to the features described in any of the preceding three paragraphs, in certain exemplary embodiments, a third voltage may be provided to the first conductive layer when the shutter is held in the shutter closed position, e.g., wherein the third voltage is lower than the first voltage; and when the shutter is held in the shutter closed position, a fourth voltage may be provided to the conductive portion of the stopper, for example, wherein the fourth voltage is lower than the second voltage and higher than the third voltage.

In addition to the features of any of the four preceding paragraphs, in certain example embodiments, the control circuit may include a first half-bridge circuit coupled between the first conductive layer and a power supply, a second half-bridge circuit coupled between the second conductive layer and the power supply, and a third half-bridge circuit coupled between the conductive portion of the stopper and the power supply, wherein the first half-bridge circuit and the second half-bridge circuit may be controlled to provide the first voltage, and the third half-bridge circuit may be controlled to provide the second voltage.

In certain exemplary embodiments, a method of making an Insulating Glass (IG) unit is provided. The method comprises the following steps: having a first substrate and a second substrate, each having an inner major surface and an outer major surface, the inner major surface of the first substrate facing the inner major surface of the second substrate. An anchor and a stop are provided. At least a portion of the stop is electrically conductive. A second dielectric layer is disposed directly or indirectly on the anchor-facing surface of the stop. Providing a dynamically controllable shade directly or indirectly on the first substrate and/or the second substrate, the shade comprising: a first conductive layer disposed directly or indirectly on an interior major surface of the first substrate; a first dielectric layer disposed directly or indirectly on a side of the first conductive layer opposite the first substrate; and a shutter including a flexible substrate supporting a second conductive layer, the shutter being extendable from the anchor toward the stopper to a shutter closed position and retractable from the stopper toward the anchor to a shutter open position. Connecting the first and second conductive layers and the conductive portion of the stopper to a control circuit configured to: (a) Providing a first voltage to the first conductive layer and the second conductive layer to generate a first electrostatic force to drive the flexible substrate to the shutter closed position; and (b) providing a second voltage to the conductive portion of the stopper to generate a second electrostatic force to help electrostatically lock the flexible substrate to the stopper. The first and second substrates are connected in a substantially parallel spaced apart relationship to each other such that a gap is defined between the first and second substrates and such that the dynamically controllable shade is located in the gap.

In addition to the features described in either of the two preceding paragraphs, in certain exemplary embodiments, the end portion of the shutter may be roller-shaped when the shutter is extended to the shutter closed position, and the anchor-facing surface of the stopper may include a bend for receiving the roller-shaped end portion of the shutter.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment and/or deposition technique, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. An insulated glass IG unit comprising:

a first substrate and a second substrate, each having an inner major surface and an outer major surface, the inner major surface of the first substrate facing the inner major surface of the second substrate;

a spacer system configured to assist the first and second substrates in maintaining a substantially parallel spaced apart relationship to each other and defining a gap therebetween;

an anchor and a stopper, at least a portion of the stopper being electrically conductive;

a dynamically controllable shade interposed between at least the first substrate and the second substrate, the shade comprising:

a first conductive layer disposed directly or indirectly on the interior major surface of the first substrate;

a first dielectric layer disposed directly or indirectly on a side of the first conductive layer opposite the first substrate; and

a shutter comprising a flexible substrate supporting a second conductive layer, the shutter being extendable from the anchor toward the stop to a shutter closed position and retractable from the stop toward the anchor to a shutter open position;

A second dielectric layer disposed directly or indirectly on an anchor-facing surface of the stop; and

a control circuit configured to:

providing a first voltage to the first conductive layer and the second conductive layer to generate a first electrostatic force to drive the flexible substrate to the shutter closed position; and

a second voltage is provided to the conductive portion of the stopper to generate a second electrostatic force to help electrostatically lock the flexible substrate to the stopper.

2. The IG unit of claim 1, wherein the stop comprises an aluminum extrusion.

3. The IG unit of claim 1, wherein the stop comprises a brass shim.

4. The IG unit of any preceding claim, wherein the second dielectric layer comprises polyimide.

5. The IG unit of any preceding claim, wherein the first electrically conductive layer forms part of a first electrode, the second electrically conductive layer forms part of a second electrode, and the electrically conductive portion of the stopper forms part of a third electrode that is electrically isolated from and controllable independently of the first and second electrically conductive layers.

6. The IG unit of any preceding claim, wherein the anchor-facing surface of the stopper is shaped to receive an end portion of the shade when the shade is extended to the shutter closed position.

7. The IG unit of any preceding claim, wherein an end portion of the light shield is roller-shaped when the light shield is extended to the shutter closed position, and wherein the anchor-facing surface of the stopper comprises a bend for receiving the roller-shaped end portion of the light shield.

8. The IG unit of any preceding claim, wherein the control circuit is further configured to provide a third voltage to the first conductive layer when the shutter is held in the shutter closed position, the third voltage being lower than the first voltage.

9. The IG unit of any preceding claim, wherein the control circuit is further configured to provide a fourth voltage to the conductive portion of the stopper when the shutter is held in the shutter closed position, the fourth voltage being lower than the second voltage.

10. The IG unit of claim 9, wherein the fourth voltage is higher than the third voltage.

11. The IG unit of any preceding claim, wherein the first voltage and the second voltage are the same.

12. The IG unit of any preceding claim, wherein the control circuit comprises a first half-bridge circuit coupled between the first conductive layer and an electrical power source, a second half-bridge circuit coupled between the second conductive layer and the electrical power source, and a third half-bridge circuit coupled between the conductive portion of the stopper and the electrical power source.

13. The IG unit of claim 12, wherein the first half-bridge circuit and the second half-bridge circuit are controlled to provide the first voltage and the third half-bridge circuit is controlled to provide the second voltage.

14. The IG unit of any preceding claim, wherein the control circuit is configured to provide the second voltage to the conductive portion of the stopper after generating the first electrostatic force driving the flexible substrate to the shutter closed position based on the first voltage.

15. A substrate, comprising:

an anchor and a stopper, at least a portion of the stopper being electrically conductive; and

a dynamically controllable shade disposed on the substrate, the shade comprising:

A first conductive layer disposed directly or indirectly on the substrate;

a first dielectric layer disposed directly or indirectly on a side of the first conductive layer opposite the substrate; and

a shutter comprising a flexible substrate supporting a second conductive layer, the shutter being extendable from the anchor toward the stop to a shutter closed position and retractable from the stop toward the anchor to a shutter open position; and

a second dielectric layer disposed directly or indirectly on an anchor-facing surface of the stop; and is also provided with

Wherein the first and second conductive layers and the conductive portion of the stopper are each connectable to a control circuit configured to:

16. The substrate of claim 15, wherein the anchor-facing surface of the stopper is shaped to receive an end portion of the shutter when the shutter is extended to the shutter closed position.

17. The substrate of claim 16, wherein the end portion of the shutter is roller-shaped when the shutter extends to the shutter closed position, and wherein the anchor-facing surface of the stopper includes a bend for receiving the roller-shaped end portion of the shutter.

18. The substrate of any one of claims 15 to 17, wherein:

when the shutter is held in the shutter closed position, a third voltage can be supplied to the first conductive layer, the third voltage being lower than the first voltage; and is also provided with

A fourth voltage can be provided to the conductive portion of the stopper when the shutter is held in the shutter closed position, the fourth voltage being lower than the second voltage and higher than the third voltage.

19. The substrate of any one of claims 15 to 18, wherein the control circuit comprises a first half-bridge circuit coupled between the first conductive layer and a power supply, a second half-bridge circuit coupled between the second conductive layer and the power supply, and a third half-bridge circuit coupled between the conductive portion of the stopper and the power supply, wherein the first half-bridge circuit and the second half-bridge circuit are controlled to provide the first voltage, and the third half-bridge circuit is controlled to provide the second voltage.

20. A method of making an insulated glass IG unit, the method comprising:

having first and second substrates each having an inner major surface and an outer major surface, the inner major surface of the first substrate facing the inner major surface of the second substrate;

providing an anchor and a stop, at least a portion of the stop being electrically conductive, and a second dielectric layer being provided directly or indirectly on an anchor-facing surface of the stop;

a shade capable of being dynamically controlled is arranged on the first substrate and/or the second substrate, and the shade comprises:

Connecting the first and second conductive layers and the conductive portion of the stopper to a control circuit configured to: (a) Providing a first voltage to the first conductive layer and the second conductive layer to generate a first electrostatic force to drive the flexible substrate to the shutter closed position; and (b) providing a second voltage to the conductive portion of the stopper to generate a second electrostatic force to help electrostatically lock the flexible substrate to the stopper; and

the first and second substrates are connected to one another in a substantially parallel spaced apart relationship such that a gap is defined between the first and second substrates and such that the dynamically controllable shade is located in the gap.

21. The method of claim 20, wherein the anchor-facing surface of the stopper is shaped to receive an end portion of the shutter when the shutter is extended to the shutter closed position.

22. The method of claim 21, wherein the end portion of the shutter is roller-shaped when the shutter extends to the shutter closed position, and wherein the anchor-facing surface of the stopper includes a bend for receiving the roller-shaped end portion of the shutter.

23. The method of any one of claims 20 to 22, wherein:

when the shutter is held in the shutter closed position, a third voltage can be supplied to the first conductive layer, the third voltage being lower than the first voltage;

24. A method of operating a dynamic shade in an insulated glass IG unit, the method comprising:

having an IG unit according to any one of claims 1 to 14;

providing the first voltage to the first conductive layer and the second conductive layer to drive the flexible substrate to the shutter closed position;

providing the second voltage to the conductive portion of the stopper to help electrostatically lock the flexible substrate to the stopper; and

causing the flexible substrate to return to the shutter open position.

25. The method of claim 24, further comprising: a third voltage is provided to the first conductive layer when the shutter is held in the shutter closed position, the third voltage being lower than the first voltage.

26. The method of claim 25, further comprising: a fourth voltage is provided to the conductive portion of the stopper when the shutter is held in the shutter closed position, the fourth voltage being lower than the second voltage.

27. The method of claim 26, wherein the fourth voltage is higher than the third voltage.

28. The method of claim 26, wherein the first voltage and the second voltage are the same.

29. The method of claim 24, wherein the stop is an aluminum extrusion or a brass shim.

30. The method of claim 24, wherein the first conductive layer forms part of a first electrode, the second conductive layer forms part of a second electrode, and the conductive portion of the stopper forms part of a third electrode that is electrically isolated from and controllable independently of the first and second conductive layers.

31. The method of claim 24, wherein the anchor-facing surface of the stopper is shaped to receive an end portion of the shutter when the shutter is extended to the shutter closed position.