CN113433686A - Display device based on electrowetting - Google Patents
Display device based on electrowetting Download PDFInfo
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- CN113433686A CN113433686A CN202110784301.8A CN202110784301A CN113433686A CN 113433686 A CN113433686 A CN 113433686A CN 202110784301 A CN202110784301 A CN 202110784301A CN 113433686 A CN113433686 A CN 113433686A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/004—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid
- G02B26/005—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid based on electrowetting
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133331—Cover glasses
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Abstract
The application provides a display device based on electrowetting, which comprises an FOG module, a glass cover plate and an electrowetting layer positioned between the FOG module and the glass cover plate, wherein the electrowetting layer comprises a first transparent electrode, a second transparent electrode, a dielectric layer paved on the second transparent electrode and a retaining wall arranged between the first transparent electrode and the second transparent electrode, a plurality of spaces are formed among the first transparent electrode, the second transparent electrode and the retaining wall, a plurality of electrowetting units which are arranged in an array manner are formed, and nonpolar liquid and polar liquid which are mutually contacted but are not miscible are filled in each electrowetting unit; under the power-on state, the contact angle of the nonpolar liquid on the surface of the dielectric layer changes, so that the phase of incident light is changed, a display picture can be finely adjusted to any position from the surface of one side, facing the electrowetting layer, of the glass cover plate to the space of one side, far away from the electrowetting layer, of the glass cover plate, the picture can float upwards in regions to display, the display effect is enriched, the paper-like effect is achieved when human eyes watch the picture, and the picture is comfortable and natural.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to a display device based on electrowetting.
Background
The LCD (Liquid Crystal Display) Display module comprises a backlight module, an FOG module (FPC on glass), and a glass cover plate, wherein the backlight module provides a uniform surface light source for LCD Display, and the FOG mainly comprises an upper polarizer, an upper glass plate, a color filter layer, a Liquid Crystal layer, a TFT (Thin Film Transistor) layer, a lower glass plate, and a lower polarizer from top to bottom. In order to realize image display, unpolarized light emitted by the backlight module is changed into polarized light after passing through the lower polarizer, liquid crystal molecules in the liquid crystal layer can change the polarization angle of the polarized light, and the size of the polarization angle can be accurately controlled through the array substrate control circuit of the TFT layer. The included angle between the polarization direction of the upper polarizer and the polarization direction of the lower polarizer is 90 degrees, the upper polarizer plays a role in polarization detection, the larger the deflection angle of liquid crystal molecules is, the larger the rotation angle of the polarization direction of the liquid crystal molecules is, and the stronger the light penetrating through the upper polarizer is, so that the deflection of the liquid crystal molecules can be controlled through the array substrate control circuit, and the brightness of a single pixel can be controlled; the gray scale display is performed after the light beam passes through the upper polarizer. The color filter layer is composed of a black matrix and RGB (red, green and blue) color layers, and the RGB color layers only allow light of red, green and blue colors to penetrate through respectively so as to control color display; the light beam can be displayed with color after passing through the color filter layer. When the human eyes watch the LCD display screen, the plane which can display the complete picture is arranged on the upper surface of the upper polaroid.
The uppermost layer of the LCD display panel is a glass cover plate, the thickness of the glass cover plate is 0.6-0.7mm, and the glass cover plate is adhered to the upper polaroid through OCA optical cement. The human eyes can see the picture displayed by the LCD panel on the surface of the upper polaroid through a layer of glass cover plate, and can obviously feel that the displayed picture is in the LCD module. In the traditional paper printing product, the picture display is on the surface of the product, and people feel more comfortable when watching the product. And LCD display panel because the imaging surface is inside the module, the comfort level when people's eye watches is lower.
Disclosure of Invention
An object of the embodiment of the application is to provide a display device based on electrowetting to solve the LCD display panel among the prior art because the imaging surface is inside the module, the not good technical problem of comfort level when people's eye watches.
In order to achieve the purpose, the technical scheme adopted by the application is as follows: the display device based on electrowetting comprises an FOG module, a glass cover plate and an electrowetting layer, wherein the electrowetting layer is positioned between the FOG module and the glass cover plate and comprises a first transparent electrode, a second transparent electrode, a dielectric layer and a retaining wall, the dielectric layer is laid on the second transparent electrode, the retaining wall is arranged between the first transparent electrode and the second transparent electrode, a plurality of spaces are formed among the first transparent electrode, the second transparent electrode and the retaining wall and form a plurality of electrowetting units which are arranged in an array, and non-polar liquid and polar liquid which are mutually contacted but not miscible are filled in each electrowetting unit; when the first transparent electrode and the second transparent electrode are in an electrified state, the contact angle of the nonpolar liquid on the surface of the dielectric layer is changed, so that the phase of incident light is changed, and a display picture is imaged on the surface of one side of the glass cover plate facing the electrowetting layer to any position in the space of one side of the glass cover plate far away from the electrowetting layer.
Optionally, the dielectric layer is a hydrophobic insulating layer, a hydrophobic coating is disposed on the surface of the dielectric layer, and the hydrophobic coating is a non-polar transparent insulating layer.
Optionally, the hydrophobic coating is tilted at the edge part close to the retaining wall; or the hydrophobic coating extends and fits to the inner side wall of the retaining wall.
Optionally, the surface of the hydrophobic coating is planar.
Optionally, the hydrophobic coating is a polytetrafluoroethylene or parylene film.
Optionally, the interfacial tension between the non-polar liquid and the polar liquid is 20-30 mN/m.
Optionally, the glass cover plate and the electrowetting layer and the FOG module and the electrowetting layer are bonded through the OCA optical cement.
Optionally, the surface of the glass cover plate is a matte diffuse reflection surface with a pit or convex structure; or the surface of the glass cover plate is adhered with the anti-glare film.
Optionally, the FOG module includes a first polarizer, a first glass plate, a TFT layer, a liquid crystal layer, a color filter layer, a second glass plate, and a second polarizer, which are stacked in sequence.
Optionally, each electrowetting cell is controlled separately.
Optionally, the position and size of each electrowetting cell corresponds to one pixel;
alternatively, each electrowetting cell corresponds to one sub-pixel in position and size.
Optionally, the display device based on electrowetting includes a backlight module, and the backlight module is coupled to a side of the FOG module away from the electrowetting layer.
The application provides a display device based on electrowetting's beneficial effect lies in: compared with the prior art, the display device based on electrowetting of this application is through setting up the electrowetting layer between second polaroid and glass apron, make the display screen image on one side surface of glass apron towards the electrowetting layer to any position in the one side space that the electrowetting layer was kept away from to the glass apron, not only can make when people's eye watches, there is the effect of watching similar paper class printing product, can feel more comfortable, nature, and the electrowetting layer is as the microlens film of controllable regulation, can realize the specific aspect that the meticulous regulation imaging screen shows through the regulation and control to the electrowetting layer, can also only float the imaging position of a part of picture near one side surface that the electrowetting layer is kept away from to the glass apron as required, or the cooperation content needs to carry out the dynamic display, the display effect is more lively abundant, diversification.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an electrowetting-based display device according to an embodiment of the present application;
fig. 2 is a schematic diagram of a structure of an electrowetting layer of the electrowetting-based display device shown in fig. 1;
FIG. 3 is a schematic structural view of an electrowetting cell of the electrowetting layer of FIG. 2 in a non-energized state, illustrating the change in the shape and contact angle of the non-polar liquid in the non-energized state;
FIG. 4 is a schematic structural view of an electrowetting cell of the electrowetting layer of FIG. 2 in an energized state, illustrating the change in the shape and contact angle of the non-polar liquid in the energized state;
fig. 5 is a schematic structural diagram of an electrowetting-based display device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electrowetting-based display device according to an embodiment of the present application;
fig. 7 is a schematic diagram of a structure of an electrowetting layer of the electrowetting-based display device of fig. 6;
fig. 8 is a schematic structural diagram of an electrowetting-based display device according to an embodiment of the present application.
Wherein, in the figures, the respective reference numerals:
1-a first polarizer; 2-a first glass plate; 3-a TFT layer; 4-a liquid crystal layer; 5-a color filter layer; 6-a second glass plate; 7-a second polarizer; 8-an electrowetting layer; 81-electrowetting cell; 811-a first transparent electrode; 812-a second transparent electrode; 813-dielectric layer; 8131-hydrophobic coating; 814-retaining wall; 815-a non-polar liquid; 816-polar liquids; 9-a glass cover plate; 10-backlight module.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 to 4 together, a display device based on electrowetting according to a first embodiment of the present application will now be described. The electrowetting-based display device comprises a FOG module, an electrowetting layer 8 and a glass cover plate 9. Illustratively, the FOG module includes a first polarizer 1, a first glass plate 2, a TFT (Thin Film Transistor) layer 3, a liquid crystal layer 4, a color filter layer 5, a second glass plate 6, and a second polarizer 7, which are sequentially stacked.
As shown in fig. 2, an electrowetting layer 8 is located between the second polarizer 7 and the glass cover plate 9, and the electrowetting layer 8 includes a first transparent electrode 811, a second transparent electrode 812, a dielectric layer 813, and a blocking wall 814. The first transparent electrode 811 and the second transparent electrode 812 are arranged in parallel and at intervals, the dielectric layer 813 is laid on one side surface of the second transparent electrode 812 facing the first transparent electrode 811, the retaining wall 814 is vertically arranged between the first transparent electrode 811 and the second transparent electrode 812, and a plurality of spaces are formed among the first transparent electrode 811, the second transparent electrode 812 and the retaining wall 814 to form a plurality of electrowetting cells 81 arranged in an array. Each electrowetting cell 81 is filled with a non-polar liquid 815 and a polar liquid 816 in contact but immiscible with each other. For example, the non-polar liquid 815 is an oil phase liquid and the polar liquid 816 is water. The polar liquid 816 is located above the non-polar liquid 815, and the non-polar liquid 815 has a light transmitting function and is equivalent to a micro lens.
Wherein the dam 814 may be a long plate and may be a plurality of dams 814, and the plurality of dams 814 are arranged between the first transparent electrode 811 and the second transparent electrode 812, so as to divide and form a plurality of space regions between the first transparent electrode 811 and the second transparent electrode 812 to correspondingly form a plurality of electrowetting cells 81. Of course, in another embodiment, the retaining wall 814 may be a frame having a plurality of grids, and the retaining wall 814 with such a structure may also divide between the first transparent electrode 811 and the second transparent electrode 812 to form a plurality of space regions to correspondingly form a plurality of electrowetting cells 81.
When the first transparent electrode 811 and the second transparent electrode 812 are in the non-energized state, i.e., when the voltage between the first transparent electrode 811 and the second transparent electrode 812 is zero, the non-polar liquid 815 forms a concave liquid surface on the surface of the dielectric layer 813, and the contact angle θ of the non-polar liquid 815 on the surface of the dielectric layer 813 is shown in the position a in fig. 2 and fig. 31Is relatively small.
As shown in a B position in fig. 2 and fig. 4, when the first transparent electrode 811 and the second transparent electrode 812 are in an energized state, electric charges are accumulated at the dielectric layer 813. The following formula is a calculation formula of the contact angle between the polar liquid 816 and the surface of the dielectric layer 813:
wherein in the formula, theta0Is the initial contact angle between the polar liquid 816 and the surface of the dielectric layer 813; θ is the contact angle between the polar liquid 816 and the surface of the dielectric layer 813 after applying a voltage across the first transparent electrode 811 and the second transparent electrode 812; u is a voltage value applied between the first transparent electrode 811 and the second transparent electrode 812; sigmaglIs the surface tension between the gas and liquid phases, constant; xi0A dielectric constant of vacuum; xirOf dielectric layer 813An effective dielectric constant; d is the effective thickness of the hydrophobic medium of the dielectric layer 813.
According to the above formula, the cosine value of the contact angle of the polar liquid 816 on the surface of the dielectric layer 813 increases with the increase of the voltage U, the contact angle decreases, the wettability increases, that is, the surface hydrophobicity decreases and the hydrophilicity increases, so that the generated electrowetting effect drives the fluid to move, and finally the contact angle θ of the non-polar liquid 815 on the surface of the dielectric layer 813 at this time is enabled to be increased2The larger, non-polar liquid 815 forms an arc-shaped meniscus on the surface of the dielectric layer 813, as shown at position B in fig. 2. The non-polar liquid 815 thus forms a microlens with a curvature, the specific radius of curvature depending on the focal plane of the desired image, typically about 50-150 μm. The contact angle of the non-polar liquid 815 on the surface of the dielectric layer 813 changes, so that light emitted by each pixel or sub-pixel is focused by the micro-lens formed by the non-polar liquid 815, thereby changing the phase of incident light, so that a display image is formed on the surface of one side of the glass cover plate 9 facing the electrowetting layer 8 to any position in space on the side of the glass cover plate 9 far away from the electrowetting layer 8.
The curvature of the non-polar liquid 815 of the electrowetting layer 8 can be controlled by controlling the magnitude of the voltage applied between the first transparent electrode 811 and the second transparent electrode 812, and in particular can be varied between the states as shown in fig. 3 and 4, to more finely adjust the position of the picture displayed, according to the focal plane position to be imaged. For example, by controlling the voltage between the first transparent electrode 811 and the second transparent electrode 812, most light rays can be focused on the surface of the glass cover plate 9 on the side far from the electrowetting layer 8, so that the display floats from the surface of the conventional polarizer to the surface of the glass cover plate 9, thereby realizing a more comfortable and paper-like eye-feeling. In addition, the position of the picture displayed on any layer between the surface of one side of the glass cover plate 9 facing the electrowetting layer 8 and the surface of one side of the glass cover plate 9 far away from the electrowetting layer 8 can be adjusted; or the position of the picture displayed in any layer of the nearby space beyond the surface of one side of the glass cover plate 9 far away from the electrowetting layer 8 can be adjusted to meet the richer display requirements.
The application provides a display device based on electrowetting, compared with the prior art, through set up electrowetting layer 8 between second polaroid 7 and glass apron 9, make display screen image formation in glass apron 9 towards electrowetting layer 8 one side surface to glass apron 9 arbitrary position in the one side space of electrowetting layer 8 is kept away from to glass apron 9, not only can make people's eye watch the time, there is the effect of watching similar paper class printed product, can feel more comfortable, it is natural, and can realize the specific aspect that the fine tuning picture shows through the regulation and control to electrowetting layer 8, richen display effect.
In another embodiment of the present application, in order to achieve a better display effect, the glass cover plate 9 is AG anti-glare glass, and the surface of the glass cover plate 9 is a matte diffuse reflection surface with a pit or protrusion structure. AG (Anti-Glare) Anti-dazzle glass is prepared by special chemical process treatment, so that the light reflecting surface of the original glass is changed into a matte diffuse reflecting surface with a plurality of concave pit or convex structures. The light is focused near the surface of the glass cover plate 9 and then is scattered by the concave pits or the convex structures on the surface of the glass cover plate 9 and then is emitted out to human eyes, and the human eyes have the impression that the image layer is positioned on the surface of one side of the glass cover plate 9 far away from the electrowetting layer 8, so that the paper is comfortable in appearance. In other embodiments, the glass cover plate 9 may be made of ordinary smooth glass, but an anti-glare film is attached to the surface of the glass cover plate 9.
In another embodiment of the present application, referring to fig. 3 and fig. 4, the dielectric layer 813 is a hydrophobic insulating layer, and a hydrophobic coating 8131 is disposed on a surface of the dielectric layer 813. The non-polar liquid 815 contacts the hydrophobic coating 8131 and, in the unpowered state, the contact angle θ of the non-polar liquid 815 on the surface of the hydrophobic coating 81311Is small; in the energized state, the contact angle θ of the non-polar liquid 815 on the surface of the hydrophobic coating 81312Becomes larger.
Optionally, the hydrophobic coating 8131 is a non-polar transparent insulating layer, and a transparent insulating material with strong hydrophobicity, low hysteresis and non-polarity is selected, for example, the hydrophobic coating 8131 is a teflon or parylene film. The hydrophobic insulating film can be obtained by coating or evaporating a glass surface with a material such as polytetrafluoroethylene (also called teflon) or poly-p-dichlorotoluene (also called parylene C).
In another embodiment of the present application, referring to fig. 3 and 4, the hydrophobic coating 8131 is tilted at the edge portion near the retaining wall 814. Therefore, a tilted slope structure is arranged at the edge of the hydrophobic coating 8131, the whole hydrophobic coating 8131 is bowl-shaped, which is beneficial to forming an arc convex liquid surface of the nonpolar liquid 815 under an electrified state and enables a contact angle theta of the nonpolar liquid 815 on the surface of the hydrophobic coating 81312And is larger. In other embodiments, the hydrophobic coating 8131 extends to fit the inner sidewall of the retaining wall 814, which also facilitates the non-polar liquid 815 to form an arc-shaped convex liquid surface in the power-on state, and enables the contact angle θ of the non-polar liquid 815 on the surface of the hydrophobic coating 81312Is larger; the portion of the hydrophobic coating 8131 attached to the dielectric layer 813 and the portion attached to the inner sidewall of the retaining wall 814 may or may not be an integral structure.
In another embodiment of the present application, the non-polar liquid 815 is a non-polar transparent organic solvent. The non-polar liquid 815 is selected from non-polar transparent organic solvents with low surface energy, for example, the non-polar liquid 815 is one or more of fluorine-containing alkane, silane, n-decane, and n-dodecane. The polar liquid 816 is an electrolyte solution, and for example, the polar liquid 816 is a NaCl solution or a KCl solution. The interfacial tension between the non-polar liquid 815 and the polar liquid 816 is 20-30 mN/m. The two liquids are immiscible and have densities as close as possible.
In another embodiment of the present application, the glass cover plate 9 and the electrowetting layer 8, and the second polarizer 7 and the electrowetting layer 8 of the FOG module are bonded by OCA optical adhesive. The bonding with the oca (optical Clear adhesive) optical glue does not affect the penetration of light between the second polarizer 7, the electrowetting layer 8 and the glass cover plate 9, and thus does not affect the final display effect.
In another embodiment of the present application, referring to fig. 1, each electrowetting cell 81 is located and sized corresponding to a sub-pixel. The color filter layer 5 is composed of a black matrix and RGB color layers, and the positions and sizes of the individual electrowetting cells 81 correspond to the positions and sizes of the individual RGB sub-pixels one by one, so that light emitted by each sub-pixel can be focused by the corresponding micro-lens formed by the non-polar liquid 815 of the electrowetting cell 81.
In another embodiment of the present application, referring to fig. 5, each electrowetting cell 81 corresponds to a pixel in position and size. That is, the position and size of a single electrowetting cell 81 correspond to the position and size of a single pixel formed by three RGB sub-pixels, so that light emitted by each pixel can be focused by the micro-lens formed by the non-polar liquid 815 of the corresponding electrowetting cell 81.
In another embodiment of the present application, each electrowetting cell 81 is controlled individually. In this way, in addition to floating and displaying the whole image on the glass cover plate 9, the electrowetting cells 81 can be controlled individually to realize the display in different regions, that is, only a part of the electrowetting layer 8 or the electrowetting cells 81 of the content can be opened, so as to form the electrowetting microlens, and the corresponding image can be displayed on the glass cover plate 9, for example, the contents of the part of the display image which needs to be highlighted, answer analysis, and the like can be floated and displayed near the surface of the glass cover plate 9 on the side far away from the electrowetting layer 8, and the images corresponding to the remaining non-opened electrowetting cells 81 are displayed on the surface of the second polarizer 7 like a conventional display, so as to achieve the layered display effect. In addition, each area picture can be dynamically displayed according to the requirement of display content, and the display effect is enriched.
In another embodiment of the present application, referring to fig. 6 and 7, unlike the slope-shaped structure of the hydrophobic coating 8131 shown in fig. 3 and 4, the surface of the hydrophobic coating 8131 in fig. 6 and 7 is a plane. Thus, when no voltage is applied between the first transparent electrode 811 and the second transparent electrode 812, the non-polar liquid 815 will automatically spread out on the hydrophobic coating 8131 to form an arc convex liquid surface meeting the requirements of focal plane position and curvature, thereby focusing light as a micro lens to achieve the effect of floating the picture on the glass cover plate 9. When a voltage is applied between the first transparent electrode 811 and the second transparent electrode 812, charges are accumulated in the dielectric layer 813, the free energy of the solid-liquid interface is reduced, and the polar liquid 816 is present in the dielectric layerThe cosine value of the contact angle on the surface 813 is increased along with the increase of the voltage U, the contact angle is reduced, the wettability is enhanced, namely the surface hydrophobicity is reduced, the hydrophilicity is enhanced, the electrowetting effect is generated, the fluid is driven to move, the polar liquid 816 pushes the non-polar liquid 815 to a corner position, close to the retaining wall 814, of one side surface of the electrowetting unit 81, the non-polar liquid 815 forms a sphere shape, and the contact angle theta of the non-polar liquid 815 on the surface of the dielectric layer 8132Larger and the width occupied by the non-polar liquid 815 in the light transmission direction is reduced, so that light can normally transmit, that is, in contrast to the previous embodiment, when the non-polar liquid 815 of the electrowetting layer 8 in the energized state has no focusing effect on light, the picture cannot float up to the position of the glass cover plate 9, but the picture is displayed on the surface of the second polarizer 7 as in the conventional display device.
Further, in the structure shown in fig. 6 and 7, the position and size of each electrowetting cell 81 correspond to the position and size of an RGB single sub-pixel one by one, so that light emitted by each sub-pixel can be focused by the micro-lens formed by the non-polar liquid 815 of the corresponding electrowetting cell 81.
In another embodiment of the present application, as shown in fig. 8, the surface of the hydrophobic coating 8131 of the dielectric layer 813 is also a plane, so that when no voltage is applied between the first transparent electrode 811 and the second transparent electrode 812, the non-polar liquid 815 will automatically spread on the hydrophobic coating 8131 to form an arc convex liquid surface meeting the requirements of focal plane position and curvature, thereby serving as a micro lens to focus light and achieving the effect of floating the picture on the glass cover plate 9; when a voltage is applied between the first transparent electrode 811 and the second transparent electrode 812, the free energy of the solid-liquid interface is reduced, so that the generated electrowetting effect drives the fluid to move, the polar liquid 816 pushes the non-polar liquid 815 to a corner of one side of the electrowetting cell 81 close to the retaining wall 814, at this time, the non-polar liquid 815 forms a sphere shape, light can normally transmit, and a picture is displayed on the surface of the second polarizer 7. Each electrowetting cell 81 corresponds to a pixel in position and size. That is, the position and size of a single electrowetting cell 81 correspond to the position and size of a single pixel formed by three RGB sub-pixels, so that light emitted by each pixel can be focused by the micro-lens formed by the non-polar liquid 815 of the corresponding electrowetting cell 81.
In another embodiment of the present application, the electrowetting-based display device includes a backlight module 10, and the backlight module 10 is attached to a side of the FOG module away from the electrowetting layer 8. Specifically, the backlight module 10 is bonded to a side of the first polarizer 1 of the FOG module, which is far away from the first glass plate 2. The backlight module 10 is suitable for all the embodiments described above.
The electrowetting-based display device provided by the application has the following advantages: firstly, by arranging the electrowetting layer 8, the micro lenses formed by the electrowetting layer 8 correspond to the sub-pixels or pixels one by one, light emitted by the sub-pixels is focused on the glass cover plate 9, an imaging picture of the LCD panel is horizontally floated on the glass cover plate 9 instead of being displayed on the surface of the second polarizer 7 below the glass cover plate 9, and therefore, when a human eye watches the LCD display picture, the human eye has the effect of watching paper-like printed products and feels more comfortable and natural. Secondly, compared with a fixed micro-lens array structure, the floating display in different areas can be realized by independently regulating and controlling each electrowetting unit 81 of the electrowetting layer 8, that is, only a part of pictures can be floating displayed on the glass cover plate 9, and the rest pictures are still displayed on the surface of the second polarizer 7 like a traditional display device, and in addition, dynamic display can be performed according to the requirement of display content. Thirdly, compared with the fixed microlens array structure, the contact angle of the non-polar liquid 815 can be finely adjusted by adjusting the voltage between the first transparent electrode 811 and the second transparent electrode 812, so as to adjust the curvature of the non-polar liquid 815 when focusing as a microlens, and finally the position of the display screen can be finely adjusted from the surface of one side of the glass cover plate 9 facing the electrowetting layer 8 to any position in the space of one side of the glass cover plate 9 far away from the electrowetting layer 8, thereby enriching the display effect.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (12)
1. The display device based on electrowetting is characterized by further comprising an electrowetting layer, wherein the electrowetting layer is positioned between the FOG module and the glass cover plate and comprises a first transparent electrode, a second transparent electrode, a dielectric layer and retaining walls, the dielectric layer is laid on the second transparent electrode, the retaining walls are arranged between the first transparent electrode and the second transparent electrode, a plurality of spaces are formed among the first transparent electrode, the second transparent electrode and the retaining walls, a plurality of electrowetting units which are arranged in an array are formed, and each electrowetting unit is filled with polar liquid and non-polar liquid which are mutually contacted but are immiscible; when the first transparent electrode and the second transparent electrode are in an electrified state, the contact angle of the nonpolar liquid on the surface of the dielectric layer changes, so that the phase of incident light is changed, and a display image is formed on any position in a space from the surface of one side, facing the electrowetting layer, of the glass cover plate to the side, far away from the electrowetting layer, of the glass cover plate.
2. The electrowetting-based display device of claim 1, wherein the dielectric layer is a hydrophobic insulating layer, a surface of the dielectric layer being provided with a hydrophobic coating, the hydrophobic coating being a non-polar transparent insulating layer.
3. The electrowetting-based display device of claim 2, wherein the hydrophobic coating layer is tilted at an edge portion near the dam;
or, the hydrophobic coating extends and fits to the inner side wall of the retaining wall.
4. The electrowetting-based display device of claim 2, wherein a surface of said hydrophobic coating is planar.
5. The electrowetting-based display device of claim 2, wherein said hydrophobic coating is a polytetrafluoroethylene or parylene film.
6. Electrowetting-based display device according to claim 1, wherein the interfacial tension between the non-polar liquid and the polar liquid is 20-30 mN/m.
7. The electrowetting-based display device of claim 1, wherein the glass cover plate and the electrowetting layer, and the FOG module and the electrowetting layer are bonded by OCA optical cement.
8. The electrowetting-based display device of claim 1, wherein a surface of the glass cover plate is a matte diffuse reflective surface having a pit or protrusion structure;
or the surface of the glass cover plate is attached with an anti-glare film.
9. The electrowetting-based display device of claim 1, wherein the FOG module comprises a first polarizer, a first glass plate, a TFT layer, a liquid crystal layer, a color filter layer, a second glass plate, and a second polarizer, which are sequentially stacked.
10. An electrowetting-based display device according to any of claims 1-9, wherein each of said electrowetting cells is individually controllable.
11. An electrowetting-based display device according to any of claims 1-9, wherein each of said electrowetting cells corresponds to a pixel in position and size;
alternatively, each electrowetting cell corresponds to one sub-pixel in position and size.
12. The electrowetting-based display device according to any of claims 1-9, wherein said electrowetting-based display device comprises a backlight module, said backlight module being attached to a side of said FOG module facing away from said electrowetting layer.
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Application publication date: 20210924 |