US20110149377A1 - Electro-optical display systems - Google Patents
Electro-optical display systems Download PDFInfo
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- US20110149377A1 US20110149377A1 US12/643,756 US64375609A US2011149377A1 US 20110149377 A1 US20110149377 A1 US 20110149377A1 US 64375609 A US64375609 A US 64375609A US 2011149377 A1 US2011149377 A1 US 2011149377A1
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Images
Classifications
-
- G—PHYSICS
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Definitions
- FIG. 4 is a block diagram of an example of the display element of FIG. 2 , showing a dot structure in accordance with an embodiment of the invention.
- FIG. 9 is a block diagram of an example of a conductor layer of the display element of FIG. 6 or FIG. 7 in accordance with an embodiment of the invention.
- First and second electrodes 40 , 42 may be configured to selectively move the plurality of colorant particles 52 between a spread position S (as shown in FIG. 2 ) in which all or nearly all of the plurality of colorant particles may be out of the recessed regions and/or distributed or spread across display volume 48 to absorb and/or scatter incident light thereby creating a colored optical appearance (“colored state”), and a compacted position C (as shown in FIG. 3 ) in which all or nearly all of the plurality of colorant particles may be in the recessed regions thereby producing a clear optical appearance (“transparent state”).
- a spread position S as shown in FIG. 2
- a compacted position C as shown in FIG. 3
- Metallic layer 116 may include any suitable metals configured to be reflective.
- the metallic layer may include silver, aluminum, gold, copper, nickel, platinum and/or rhodium, alloys of those metals, multi-layer structures of those metals and/or their alloys, and/or any suitable combinations with dielectric layers to further enhance reflective properties.
- Metallic layer 116 may be formed on the base layer via any suitable techniques, such as physical vapor deposition, chemical vapor deposition, atomic layer deposition, electroplating, etc.
- FIG. 8 shows conductor layer 112 having base layer 114 with structured surfaces 118 and metallic layer 116 , the conductor layer may alternatively be a single metallic layer having those structured surfaces.
- Conductor layer 120 may include any suitable structure configured to make the layer reflective and/or absorptive.
- conductor layer 120 may include a base layer 122 and a transparent conductive layer 124 .
- Base layer 122 may be any suitable dielectric, semiconductive or conductive layer with one or more embedded particles 126 .
- Embedded particles 126 may include scattering particles and/or absorptive particles.
- base layer 122 may be a resin layer with the scattering or absorbing particles.
- Embedded particles 126 may be configured to reflect and/or absorb one or more wavelengths of light.
- embedded particles 126 may be configured to reflect or absorb white (or all colors) or any other suitable color(s).
- the display element may switch between a spot color and a white color by using colorant particles having the spot color and a layer configured to reflect the color white. Additionally, the display element may switch between first and second colors by using colorant particles with a third color (where the third color combined with the first color results in the second color) and one or more layers configured to reflect the first color. Moreover, the display element may provide full color with a plurality of layers that are configured to reflect the color red, green, blue, white, cyan, magenta, yellow, and/or spot color(s).
Abstract
Description
- Electro-optical or electrokinetic display systems are information displays that form visible images using one or more of electrophoresis, electro-convection, electrochemical interaction and/or other electrokinetic phenomena. Those display systems may have a plurality of states, including a transparent (or clear) state and a colored (or dark) state. For example, electro-optical display systems that use electrophoretic phenomena to translate or move colorant particles may collect those particles at least substantially out of the viewing area of the display system to create a transparent state. The colorant particles also may be spread across the viewing area of the display to create a colored state.
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FIG. 1 is a block diagram of a display element of an electro-optical display system in accordance with an embodiment of the invention. -
FIG. 2 is a block diagram of an example of the display element of the electro-optical display system ofFIG. 1 , shown in a colored state in accordance with an embodiment of the invention. -
FIG. 3 is a block diagram of the display element ofFIG. 2 , shown in a transparent state in accordance with an embodiment of the invention. -
FIG. 4 is a block diagram of an example of the display element ofFIG. 2 , showing a dot structure in accordance with an embodiment of the invention. -
FIG. 5 is a block diagram of an example of the display element ofFIG. 2 , showing a line structure in accordance with an embodiment of the invention. -
FIG. 6 is a block diagram of an example of the display element ofFIG. 2 in accordance with an embodiment of the invention. -
FIG. 7 is a block diagram of an example of the display element ofFIG. 2 in accordance with an embodiment of the invention. -
FIG. 8 is a block diagram of an example of a conductor layer of the display element ofFIG. 6 orFIG. 7 in accordance with an embodiment of the invention. -
FIG. 9 is a block diagram of an example of a conductor layer of the display element ofFIG. 6 orFIG. 7 in accordance with an embodiment of the invention. -
FIG. 10 is a block diagram of an example of the display element ofFIG. 2 in accordance with an embodiment of the invention. -
FIG. 11 is a flow chart showing an example of a method of manufacturing an electro-optical display system in accordance with an embodiment of the invention. -
FIG. 1 shows an example of an electro-optical display system 20 having one ormore display elements 22.Display element 22 may be a segment, a pixel, a sub-pixel, or a super-pixel having two or more pixels.Display element 22 may include adisplay volume 24, asource 26 and asink 28.Display volume 24,source 26 andsink 28 may be fluidly connected and may contain acarrier fluid 30 having a plurality ofcolorant particles 32.Source 26 may includecolorant particles 32 that may be selectively controlled to enterdisplay volume 24.Sink 28 may receivecolorant particles 32 fromdisplay volume 24. However, the roles ofsource 26 andsink 28 may be reversed during operation ofdisplay element 22. In other words,source 26 may becomesink 28, and vice-versa.Flow lines 34 may illustrate movement ofcolorant particles 32 fromsource 26 to sink 28 with convective movement ofcarrier fluid 30. -
Colorant particles 32 may have any suitable size, such as between several nanometers and several microns. Additionally,colorant particles 32 may have the property of changing the spectral composition of the incident light by absorbing and/or scattering certain portions of the spectrum. As a result,colorant particles 32 may appear colored which provides a desired optical effect.Carrier fluid 30 may havecolorant particles 32 with a single color or may have two or more sets of colorant particles with each set having a different color from the other sets. Althoughdisplay system 20 is shown to includecolorant particles 32, the display system may alternatively, or additionally, include one or more other suitable colorant technologies, such as dyed fluids, charged inks, oil films, etc. - The convective currents illustrated by
flow lines 34 ofdisplay element 22 may lead to any suitable movement ofcolorant particles 32, such as out-of-plane movement (substantially transverse to substrate) as well as in-plane movement (substantially parallel to substrate), to provide the desired optical appearance. Additionally, the convective currents may be generated in one or more suitable ways. For example, the convective currents may be generated by unbalanced volumetric forces inside the fluids that cause different parts of the fluid to move relative to each other. Additionally, the convective currents may occur under gravity if different parts of the fluid have different density caused, for example, by localized heating. - Moreover, convective currents may be generated by pressure or concentration gradients inside the fluid produced by localized chemical reactions, localized heating or other disturbances. Furthermore, convective currents may occur if there are ionic currents in the fluid caused by external electric fields (AC or DC) and there is charge injection into the fluid. The moving ions may then create the pressure gradient through viscous drag and excluded volume effects. Such convective currents may sometimes be referred to as “electro-convective currents.” Although particular examples of generating the convective currents are described above,
display system 20 may alternatively, or additionally, use any suitable physical principles to repel, attract, move, compress, concentrate or disperse colorants, such as electrokinetics, electrophoretics, electrowetting and electrofluidics. -
FIGS. 2-3 illustrate an example of adisplay element 38 for electro-optical display system 20. Unless specifically excluded,display element 38 may include one or more components and/or one or more functions of the other display elements in this disclosure.Display element 38 may be a segment, a pixel, a sub-pixel, or a super-pixel having two or more pixels of electro-optical display system 20. Additionally, the layers ofdisplay element 38 shown inFIGS. 2-3 are for illustration only and may not represent the relative size or thickness of each layer.Display element 38 may include a plurality ofelectrodes 39, which may be arranged in any suitable way. For example, two or more electrodes of the plurality ofelectrodes 39 may be coplanar and/or one or more of the plurality ofelectrodes 39 may be opposed electrodes. Plurality ofelectrodes 39 may include afirst electrode 40 and asecond electrode 42.First electrode 40 may be the conceptual “source” and may be made of transparent or opaque material(s), whilesecond electrode 42 may be the conceptual “sink” and may be made of transparent or opaque material(s). - A
dielectric layer 44 may be disposed, deposited or formed onsecond electrode 42.Dielectric layer 44 may be transparent and/or may include one ormore colorant particles 32, including colorant dyes and/or pigments.Dielectric layer 44 may includerecessed regions 46, which may be any suitable size(s) and/or shape(s). For example,recessed regions 46 may be configured to contain a plurality ofcolorant particles 32 ofdisplay element 38. Althoughdielectric layer 44 is shown to be formed onsecond electrode 42, the dielectric layer may alternatively, or additionally, be formed onfirst electrode 40. -
First electrode 40 may be fixed a distance apart fromdielectric layer 44 andsecond electrode 42 to define adisplay volume 48 that holds acarrier fluid 50 having a plurality ofcolorant particles 52. In other words, displayvolume 48 and/orcarrier fluid 50 having the plurality ofcolorant particles 52 may be disposed betweenfirst electrode 40 anddielectric layer 44 and/orsecond electrode 42.Carrier fluid 50 may include one or more polar fluids (e.g., water) and/or one or more non-polar fluids (e.g., dodecane). Additionally, or alternatively,carrier fluid 50 may include one or more anisotropic fluids, such as liquid crystal.Carrier fluid 50 also may include one or more surfactants (such as salts), charging agents, stabilizers, and dispersants. Additionally,carrier fluid 50 may include one or more dyed fluids, which may have a color different from the color ofcolorant particles 52. - First and
second electrodes colorant particles 52 between a spread position S (as shown inFIG. 2 ) in which all or nearly all of the plurality of colorant particles may be out of the recessed regions and/or distributed or spread acrossdisplay volume 48 to absorb and/or scatter incident light thereby creating a colored optical appearance (“colored state”), and a compacted position C (as shown inFIG. 3 ) in which all or nearly all of the plurality of colorant particles may be in the recessed regions thereby producing a clear optical appearance (“transparent state”). - For example, first and
second electrodes colorant particles 52 to the compacted position. Transverse solid lines of arrows inFIG. 3 may indicate electric field lines, while dashed lines of arrows leading into the recess regions may indicate the flow of plurality ofcolorant particles 52 following the electrostatic and convective flows. To switchdisplay element 38 from the clear state to the dark state, the polarity of the voltage may be reversed. That reversal may induce convective flow in the opposite direction andcolorant particles 52 may no longer be electrically contained in the recessed regions. As a result, plurality ofcolorant particles 52 may be mass transported to displayvolume 24 and then may spread relatively evenly throughout the display volume. - The convective flow may be induced by ionic mass transport in
carrier fluid 50 and charge transfer betweencarrier fluid 50 andelectrodes carrier fluid 50 is coupled toelectrodes - Alternatively, the convective flow may be a transient effect caused by the ionic mass transport in
carrier fluid 50, but without charge transfer between the carrier fluid and the electrode. In this case, the convective flow may proceed for a finite amount of time and may facilitate the compaction ofcolorant particles 52 in the recessed regions. After thatcolorant particles 52 may be contained in the recessed regions by electrostatic forces generated by a coupling with the electrodes. Convection withindisplay element 38 may also be induced by other means. For example, convective flow can be induced by an electrokinetic means, a mechanical means (e.g., mechanical pistons), temperature gradients (e.g., heating of the sources and sinks, focused radiation), chemical potential gradients, as well as other means. -
FIG. 4 shows an example of a display element, which is generally indicated at 54, having a dot structure for the recessed regions. Unless specifically excluded, display element 54 may include one or more components and/or one or more functions of the other display elements in this disclosure. Additionally, the layers of display element 54 shown inFIG. 4 are for illustration only and may not represent the relative size or thickness of each layer.FIG. 4 shows atop view 56 and a cross-sectional view 58 of display element 54. Display element 54 may be a segment, a pixel, a sub-pixel, or a super-pixel having two or more pixels of electro-optical display system 20. - Display element 54 may include a display volume 59 defined by a
first electrode 60, adielectric layer 62 having a plurality of recessedregions 64, a second electrode 66 and asubstrate 68. As shown inFIG. 4 , recessedregions 64 may be shaped as dots and may be periodically distributed. Each dot-shaped recess region patterned intodielectric layer 62 may connect display volume 59 to second electrode 66. Display element 54 also may include another substrate (not shown) on whichfirst electrode 60 is disposed. Although recessedregions 64 are shown to be periodically distributed, the recessed regions may alternatively, or additionally, be aperiodically or stochastically distributed. - Additionally, although recessed
regions 64 are shown to be in the form of dots, the recessed regions may alternatively, or additionally, include any suitable shape(s). For example,FIG. 5 shows atop view 70 and across-sectional view 72 of a display element 74 having a dielectric layer with recessed regions that are in the form of lines or linear channels, which may be periodically or aperiodically distributed. Unless specifically excluded, display element 74 may include one or more components and/or one or more functions of the other display elements in this disclosure. Additionally, the layers of display element 74 shown inFIG. 5 are for illustration only and may not represent the relative size or thickness of each layer. Display element 74 may include a first electrode 76, adielectric layer 78 having a plurality of recessedregions 80, asecond electrode 82 and a substrate 84. Additionally, display element 74 may include another substrate (not shown) on which first electrode 76 is disposed. -
FIG. 6 shows another example of a display element for an electro-optical display system, generally indicated at 86. Display element 86 may be a segment, a pixel, a sub-pixel, or a super-pixel having two or more pixels of an electro-optical display system. Unless specifically excluded, display element 86 may include one or more components and/or one or more functions of the other display elements in this disclosure. Additionally, the layers of display element 86 shown inFIG. 6 are for illustration only and may not represent the relative size or thickness of each layer. - Display element 86 may include a
display volume 87 defined by a first electrode orfirst conductor layer 88, a dielectric layer 90 having recessedregions 92, a second electrode or second conductor layer 94, and abottom substrate 96.First conductor layer 88 and dielectric layer 90 may be configured to be transparent. Second conductor layer 94 may be configured to be reflective (also may be referred to as a “reflective conductor layer). The reflective conductor layer may be configured to reflect one or more wavelengths of light in any suitable way(s), such as diffusely reflecting those wavelengths of light. The reflective conductor layer may include a single layer (that may include reflecting particles, surfaces and/or other characteristics), or may include two or more layers (with one or more of those layers including reflecting particles, surfaces and/or other characteristics), as further discussed below. - Display element 86 also may include a
top substrate 97 on whichfirst electrode 88 is disposed. Additionally, display element 86 may include apassivation layer 98, which may include any chemical or mechanical layer configured to improve robustness of second electrode 94. For example,passivation layer 98 may include an organic layer, such as parylene coating, and/or an inorganic layer, such as silicon dioxide, silicon nitride, aluminum oxide, and/or hafnium oxide, etc.Passivation layer 98 may be any suitable thickness, such as a few nanometers to a few micrometers, that may still allow for charge transfer when required by the particular electrokinetic technology used.Passivation layer 98 also may enhance reflection. For example,passivation layer 98 may include silicon dioxide or silicon nitride (e.g., enhanced aluminum reflector) configured to enhance reflectance, while protecting the reflective surface.Passivation layer 98 may need to have its thickness and/or index optimized to provide higher reflectivity. -
FIG. 7 shows another example of a display element for an electro-optical display system, generally indicated at 100.Display element 100 may be a segment, a pixel, a sub-pixel, or a super-pixel having two or more pixels of an electro-optical display system. Unless specifically excluded,display element 100 may include one or more components and/or one or more functions of the other display elements in this disclosure. Additionally, the layers ofdisplay element 100 shown inFIG. 7 are for illustration only and may not represent the relative size or thickness of each layer. -
Display element 100 may include adisplay volume 101 defined by a first electrode orfirst conductor layer 102, adielectric layer 104 having recessedregions 106, a second electrode orsecond conductor layer 108, and abottom substrate 110.First conductor layer 102 anddielectric layer 104 may be configured to be transparent.Second conductor layer 108 may be configured to be reflective, such as diffusely reflective.Display element 100 also may include atop substrate 111 on whichfirst conductor layer 102 is disposed. -
FIG. 8 shows an example of a conductor layer, generally indicated at 112, which may include structured surfaces configured to reflect and/or absorb at least one wavelength of light. Unless specifically excluded,conductor layer 112 may include one or more components and/or one or more functions of the other conductor layers in this disclosure. Additionally, the layers ofconductor 112 layer shown inFIG. 8 are for illustration only and may not represent the relative size or thickness of each layer. -
Conductor layer 112 may include abase layer 114 and ametallic layer 116.Base layer 114 may be any suitable dielectric, semiconductive or conductive layer with one or morestructured surfaces 118.Structured surfaces 118 may include structured scattering surfaces and/or structured absorptive surfaces. For example,base layer 114 may be a resin layer withstructured surfaces 118.Structured surfaces 118 may include a textured surface, a porous surface, and/or other surfaces structured to function as a reflector (such as a white or color reflector) or an absorber (such as a black absorber). The scattering surfaces may be structured with stochastic and/or periodic surfaces of average pitch (ranging from about a submicron to about a few tens of microns) and/or undulation (ranging from about a submicron to about a few tens of microns). - The pitch and/or undulation of those surfaces may be configured to reflect all visible wavelengths of light or specific wavelength(s) of light. For example, the pitch may determine an angle over which light is diffusely scattered (which may affect the viewing angle), while the amplitude of the undulation may control how much of the light is diffusely rather than specularly reflected. The pitch and/or undulation of the surface may, for example, be configured to reflect the color white, red, blue, green and/or other suitable color(s). Additionally, a black absorbing surface may be formed when the surface is structured to be absorptive or anti-reflective for visible wavelengths of light with an average pitch on the subwavelength scale (i.e., a nanometer to a few hundred nanometers). Those surfaces may be structured via any suitable method(s), such as photolithography (e.g., using a mask of random dots), embossing, laser holography, self-assembly, etching, etc.
-
Metallic layer 116 may include any suitable metals configured to be reflective. For example, the metallic layer may include silver, aluminum, gold, copper, nickel, platinum and/or rhodium, alloys of those metals, multi-layer structures of those metals and/or their alloys, and/or any suitable combinations with dielectric layers to further enhance reflective properties.Metallic layer 116 may be formed on the base layer via any suitable techniques, such as physical vapor deposition, chemical vapor deposition, atomic layer deposition, electroplating, etc. AlthoughFIG. 8 showsconductor layer 112 havingbase layer 114 with structuredsurfaces 118 andmetallic layer 116, the conductor layer may alternatively be a single metallic layer having those structured surfaces. -
FIG. 9 shows another example of a conductor layer, generally indicated at 120, which may include embedded particles configured to reflect and/or absorb at least one wavelength of light. Unless specifically excluded,conductor layer 120 may include one or more components and/or one or more functions of the other conductor layers in this disclosure. Additionally, the layers ofconductor layer 120 shown inFIG. 9 are for illustration only and may not represent the relative size or thickness of each layer. -
Conductor layer 120 may include any suitable structure configured to make the layer reflective and/or absorptive. For example,conductor layer 120 may include abase layer 122 and a transparentconductive layer 124.Base layer 122 may be any suitable dielectric, semiconductive or conductive layer with one or more embeddedparticles 126. Embeddedparticles 126 may include scattering particles and/or absorptive particles. For example,base layer 122 may be a resin layer with the scattering or absorbing particles. Embeddedparticles 126 may be configured to reflect and/or absorb one or more wavelengths of light. For example, embeddedparticles 126 may be configured to reflect or absorb white (or all colors) or any other suitable color(s). Examples of suitable transparent conducting materials may include (1) inorganic transparent conductors, such as indium tin oxide (ITO) (which can be used to dissipate charge in a hybrid electrode), indium zinc oxide (IZO), etc.; (2) organic transparent conductors, such as polyethylene dioxythiophene (PEDOT), polyacetylene (PAc), polyaniline (PAni), etc.; (3) a subwavelength structured metal layer; (4) a thin transparent metal layer (i.e., a metal layer having from 80% to 90% transparency); and/or (5) a network of nanostructures, such as carbon nanotubes, silver nanowires, etc. - Any suitable scattering particles may be used, including metal oxide particles (such as titanium oxide, aluminum oxide and silicon dioxide), polytetrafluoroethylene powders, polytetrafluoroethylene variant powders or particles, cesium oxide, organic polymer particles (such as silicone resin particles and polystyrene resin particles), sulfate particles (such as barium sulfate), carbonate particles (such as calcium carbonate) and/or other suitable particles. Additionally, or alternatively, any suitable absorptive particles may be used, including carbon black, bone black (carbon black+calcium phosphate), copper chromite black, synthetic iron oxide black, chromium iron oxide black, and organic black pigments, such as perylene black and their variants (including their combinations or encapsulated black particles).
- The particles above may be embedded via any suitable technique(s), including mixing, milling, ink-jetting, screen printing, spin coating, etc. For example, titanium oxide or carbon black may be mixed with ultraviolet or thermally curable resin and then cured with the resin. Although
FIG. 9 showsconductor layer 120 havingbase layer 122 with embeddedparticles 126 and transparentconductive layer 124, the conductor layer may alternatively be a single conductive resin layer having those embedded particles. -
FIG. 10 shows another example of a display element for an electro-optical display system, generally indicated at 128, which may include a dielectric layer configured to reflect and/or absorb at least one wavelength of light.Display element 128 may be a segment, a pixel, a sub-pixel, or a super-pixel having two or more pixels of an electro-optical display system. Unless specifically excluded,display element 128 may include one or more components and/or one or more functions of the other display elements in this disclosure. Additionally, the layers ofdisplay element 128 shown inFIG. 10 are for illustration only and may not represent the relative size or thickness of each layer. -
Display element 128 may include adisplay volume 129 defined by afirst conductor layer 130, areflective dielectric layer 132 having recessedregions 134, asecond conductor layer 136, and asubstrate 138.First conductor layer 130 may be configured to be transparent, whilesecond conductor layer 136 may be configured to be either opaque or transparent. -
Dielectric layer 132 may include one or more polytetrafluoroethylene variants, such as those variants that exhibit Lambertian reflective characteristics. Alternatively, or additionally,dielectric layer 132 may include one or more embeddedcolorant particles 140.Colorant particles 140 may include scattering particles and/or absorptive particles. The scattering particles may be configured to reflect any suitable wavelengths of light, such as the color white or any suitable color(s). When the colorant scattering particles are configured to reflect the color white, those particles may be referred to as “white scattering particles.” The colorant scattering particles may include metal oxide particles (such as titanium oxide, aluminum oxide and silicon dioxide), polytetrafluoroethylene powders, polytetrafluoroethylene variant powders or particles, cesium oxide, organic polymer particles (such as silicone resin particles and polystyrene resin particles), sulfate particles (such as barium sulfate), carbonate particles (such as calcium carbonate) and/or other suitable particles configured to reflect any suitable wavelengths of light. - The embedded absorptive particles may be configured to absorb any suitable wavelength(s) or all wavelengths of light. When the absorbing particles are configured to absorb all color, those particles may be referred to as “black absorbing particles.” The absorbing particles may include carbon black, bone black (carbon black+calcium phosphate), copper chromite black, synthetic iron oxide black, chromium iron oxide black, and organic black pigments, such as perylene black and their variants (including their combinations or encapsulated black particles).
- The particles may be embedded and/or patterned via any suitable technique(s), including mixing, ink-jetting, screen printing, gravure coating, spin coating, spray coating, etc. For example, titanium oxide may be mixed with ultraviolet curable resin and then cured with the resin. Examples of other types of suitable resins include embossing, photopolymerizable, photocurable, or thermally curable resins. Examples of such resins include epoxy-based negative photoresist, such as SU8, or a base resin, such as a low viscosity aliphatic urethane diacrylate.
Colorant particles 140 may additionally, or alternatively, include one or more colored dyes and/or pigments. For example,colorant particles 140 may include any suitable colored dye(s) and white scattering particles (or a white reflective conductor layer). Althoughdielectric layer 132 is shown to include particular structure configured to reflect one or more wavelengths of light, the dielectric layer may alternatively, or additionally, include any suitable structure. For example,dielectric layer 132 may include a multilayer stack of dielectric layers with alternating high and low refractive index layers to provide highly reflective properties for the specific wavelength(s) of interest.Dielectric layer 132 also may include any suitable structure having one or two dimensional surface grating structures configured to reflect the specific wavelength(s) of interest. -
Display element 128 also may include atop substrate 144 on whichfirst electrode 144 may be disposed on. Although the display elements described in this disclosure are shown to include a plurality of electrodes, the display elements may alternatively, or additionally, include electrokinetic elements, heating elements, microfluidic elements, micro-electromechanical elements, etc. Additionally, the structures and/or techniques shown for conductor or dielectric layers may be used on any suitable electrokinetic or electro-optical display system. - The layers discussed in this disclosure that are configured to reflect and/or absorb at least one wavelength of light may be used to create various color embodiments in the display elements described in this disclosure and/or other display elements of electro-optical display systems. For example, the display element may be configured with different transparent and colored states by using different colorant particles and/or different layers that are configured to reflect and/or absorb any suitable color(s), such as red, green, blue, cyan, magenta, yellow, white, spot color(s) [or color(s) matched to specific application(s)], a color different from the color of the colorant particles and/or fluid and/or other suitable color(s).
- For example, the display element may switch between a spot color and a white color by using colorant particles having the spot color and a layer configured to reflect the color white. Additionally, the display element may switch between first and second colors by using colorant particles with a third color (where the third color combined with the first color results in the second color) and one or more layers configured to reflect the first color. Moreover, the display element may provide full color with a plurality of layers that are configured to reflect the color red, green, blue, white, cyan, magenta, yellow, and/or spot color(s).
- Furthermore, the display element may switch between a spot color and a black color by using at least one layer configured to absorb a spot color and at least one layer configured to reflect the color white with black colorant particles. Additionally, the display element may switch between first and second colors by using at least one layer configured to absorb the first color, colorant particles with a third color (where the third color combined with the first color results in the second color), and at least one layer configured to reflect the color white. Additionally, the display element may provide full color with a plurality of layers that are configured to absorb various colors, such as red, green, blue and white, and layers configured to reflect the color white. Further variations of the above also are possible by using a transparent dielectric layer, a dyed dielectric layer or a dielectric layer with colorant particles.
-
FIG. 11 shows an example of a method, which is generally indicated at 200, of manufacturing an electro-optical display system. WhileFIG. 11 shows illustrative steps of a method according to one example, other examples may omit, add to and/or modify any of the steps shown in that figure. As illustrated inFIG. 11 ,method 200 may include establishing a base layer on a substrate at 202. Establishing that base layer may include structuring one or more surfaces of the base layer, and/or depositing a metallic layer on the base layer. Alternatively, or additionally, establishing the base layer may include embedding the base layer with a plurality of colorant particles, such as scattering and/or absorptive particles. - A passivation layer may be established or formed on the base layer at 204. A dielectric layer may be established or formed adjacent the passivation layer at 206. For example, the dielectric layer may be formed on the passivation layer. Alternatively, the dielectric layer may be formed on a different layer that is adjacent the passivation layer (such as a conductor layer opposed from the passivation layer and across from a display volume of the display system). Establishing the dielectric layer may include establishing a dielectric layer that includes a polytetrafluoroethylene variant and/or establishing a dielectric layer that includes resin having a plurality of colorant particles, such as scattering and/or absorptive particles. The dielectric layer may be transparent. The dielectric layer may be patterned with recessed regions sized to contain a colorant species at 208. The base and/or dielectric layers may be configured to reflect at least one wavelength of light when the colorant species is contained in the recessed regions.
- Electro-
optical display system 20 also may include computer-readable media comprising computer-executable instructions for manufacturing an electro-optical display system, the computer-executable instructions being configured to perform one or more steps ofmethod 200 discussed above.
Claims (20)
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