CN102998791A - Electro-wetting display device - Google Patents
Electro-wetting display device Download PDFInfo
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- CN102998791A CN102998791A CN2012105112396A CN201210511239A CN102998791A CN 102998791 A CN102998791 A CN 102998791A CN 2012105112396 A CN2012105112396 A CN 2012105112396A CN 201210511239 A CN201210511239 A CN 201210511239A CN 102998791 A CN102998791 A CN 102998791A
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Abstract
The invention discloses an electro-wetting display device, adopts the electro-wetting technology and aims at solving the problem that the single-layer electro-wetting display device is complex in structure. The electro-wetting display device comprises a first base plate and a second base plate, a space arranged between the first base plate and the second base plate comprises a plurality of pixel regions, and a first transparent electrode, a hydrophobic dielectric layer, a first fluid layer, a second fluid layer and a second transparent electrode are arranged in each pixel region sequentially from the first base plate to the second base plate. The electro-wetting display device is characterized in that the first fluid layer is a white reflection layer. The electro-wetting display device achieves transmission-type electro-wetting display by being directly provided with the white reflection layer and a colored film, and achieves reflection-type electro-wetting display by being directly provided with the reflexible white reflection layer, the colored film and a black absorption layer. The electro-wetting display device solves the problem that the existing single-layer electro-wetting display device is complex in structure.
Description
Technical field
The present invention relates to the display technique field, relate in particular to a kind of electric moisten display device.
Background technology
At present, many photoelectric technologies develop fast and are applied on the flat-panel monitor of future generation.Under this environment, a kind of electric moisten display device based on the wetting principle of electricity is because it possesses fast response time, the visual angle is wide, power consumption is little, the frivolous advantage such as portable is paid close attention to widely.
The wetting principle of electricity refers to be applied to electromotive force between the liquid-solid electrode by adjustment, changes the surface tension between liquid and the solid, thereby changes contact angle between the two.The electric moisten display device of the wetting principle of electricity can by coloured oil film the contraction under the Control of Voltage and expansion control gray scale with realize multicolor displaying or by the black oil film the contraction under the Control of Voltage and gray scale is controlled in expansion and cooperates with color film realize showing or by the black oil film under Control of Voltage contraction and expand and control gray scale realization white and black displays.
At present the electric moisten display device of common electric wetting principle substantially comprise the first substrate that is oppositely arranged, second substrate and between the first transparency electrode, the second transparency electrode, hydrophilic isolation structure, hydrophobic medium layer, first fluid layer and second fluid layer; Wherein, described second substrate lower surface forms described the second transparency electrode; Described first substrate upper surface forms described the first transparency electrode and described hydrophobic medium layer; Hydrophilic isolation structure is formed between described hydrophobic medium layer and described the second transparency electrode.Hydrophilic isolation structure mostly is and is the cofferdam that trellis arranges, the hydrophobic medium layer is become a plurality of rectangular areas with spatial separation between the second transparency electrode, to form the cavity corresponding to sub-pixel between described first substrate and described second substrate, above-mentioned each rectangular area namely is a pixel region of electric wetting principle electric moisten display device.In addition, described hydrophobic medium layer can also be drain insulating layer, also is provided with insulation course between hydrophobic medium layer and described the first transparency electrode.
Be provided with first fluid layer and second fluid layer in each pixel region, described first fluid layer is opaque non-polar solution, and described second fluid layer is transparent polar fluid.Wherein, described first fluid layer is filled in the upper surface of described hydrophobic medium layer, and described second fluid layer is arranged between described first fluid layer and described the second transparency electrode.The material of described first fluid layer is generally the alkane of black ink, opaque color oil or similar hexadecane.Described second fluid layer normally with the immiscible electrically conducting transparent liquid of described first fluid layer, can be water or salt solusion.Described electric moistening display utilizes surround lighting to show more, in order to improve display effect, can also be provided be used to the backlight that incident ray is provided at the lower surface of first substrate.
Comprise that take electric moisten display device first fluid layer black ink, second fluid layer comprise that polar water solution, first substrate comprise that reflective, second substrate lower surface are provided with color film and the reflective electrowetting display device are described as example now.
Wherein, black ink opens the light as optical gate and controls the amount of penetrating of incident light.When not applying voltage on the first transparency electrode and the second transparency electrode, black ink meeting uniform fold is on hydrophobic medium layer surface, and be light tight state this moment, and pixel region shows dark attitude; When on the first transparency electrode and the second transparency electrode, applying voltage respectively, form electric potential difference between the first transparency electrode and the second transparency electrode, produce electric field between the first transparency electrode and the second transparency electrode, because the effect of electric field, can produce polarization charge on the hydrophobic medium layer, the generation of polarization charge can strengthen the hydrophobic medium layer to the affinity of polar water solution, polar water solution is spread out on the hydrophobic medium layer, and ordered about black ink to the pixel corner.
Simultaneously, because the voltage of the first transparency electrode changes, so polar water solution is not identical to the degree of ordering about of black ink, so the light quantity of incident light is not identical yet, and the brightness of the colorama that reflects through reflective also changes.
Electrowetting technology has two kinds of possible display modes at present, is respectively individual layer and sandwich construction; The individual layer electric moisten display device adopts black ink collocation colored filter to make, manufacturing process is fairly simple, but such complicated structure uses white oil film then can possess simultaneously the originally effect of black oil film and reflective, while simplification device structure.
Summary of the invention
The embodiment of the invention provides a kind of electric moisten display device, in order to solve the low problem of light utilization efficiency in the individual layer electric moisten display device.
A kind of electric moisten display device that the embodiment of the invention provides, this device comprises first substrate and second substrate, space between described first substrate and the described second substrate comprises a plurality of pixel regions, be disposed with the first transparency electrode, hydrophobic medium layer, first fluid layer, second fluid layer, the second transparency electrode from first substrate to second substrate in the described pixel region, described first fluid layer is white reflecting layer.
The electric moisten display device that the embodiment of the invention provides, change prior art and utilize the design of the common reflective electrowetting display device that realizes of black ink, reflective and color film, directly adopt the white reflecting layer with strong reflection to realize the wetting demonstration of transmission-type electricity in conjunction with color film; Simultaneously, also utilize white oil reservoir to realize the reflective electrowetting demonstration in conjunction with the black absorption layer.The electric moisten display device that the embodiment of the invention provides uses the white oil reservoir of the effect that possesses simultaneously script black oil film and reflective, has overcome the problem of individual layer electric moisten display device complicated structure in the prior art.
Description of drawings
The synoptic diagram of the transmission-type electric moisten display device that Fig. 1 provides for the embodiment of the invention one;
The synoptic diagram of the reflective electrowetting display device that Fig. 2 provides for the embodiment of the invention two.
Embodiment
The embodiment of the invention provides a kind of electric moisten display device simple in structure in order to overcome the problem of individual layer electric moisten display device complicated structure in the prior art.
Aforementioned and other technology contents of the present invention, Characteristic in the detailed description of following cooperation embodiment with reference to the accompanying drawings, will clearly present.The direction term of mentioning in following examples, for example, front, rear, left and right etc. only are the directions with reference to attached drawings.Therefore, the direction term of use only is explanation and unrestricted the present invention.
The electric moisten display device of the employing electrowetting technology that the embodiment of the invention one provides is the transmission-type electric moisten display device, and its structure as shown in Figure 1.As can be seen from Figure 1, in the described transmissive display, the transparent first substrate 11 and the second substrate 12 that arrange toward each other, it makes material such as glass, resin etc.; And have between first substrate 11 and the second substrate 12 and have second fluid layer 13 and first fluid layer 14.Be provided with color film 15 on the relative side of second substrate 12 and first substrate 11, be provided with the second transparency electrode 17 on the color film 15; Hydrophilic isolation structure 16 is formed between described hydrophobic medium layer and described the second transparency electrode 17.Hydrophilic isolation structure 16 mostly is and is the cofferdam that trellis arranges, the hydrophobic medium layer is become a plurality of rectangular areas with spatial separation between the second transparency electrode 17, to form the cavity corresponding to sub-pixel between described first substrate 11 and described second substrate 12, above-mentioned each rectangular area namely is a pixel region of electric moisten display device.Each pixel region comprises from top to bottom: second substrate 12, color film 15, the second transparency electrode 17, second fluid layer 13, first fluid layer 14, hydrophobic medium layer 18, insulation course 19, the first transparency electrode 110 and first substrate 11.
In the electric moisten display device that the embodiment of the invention provides, the second transparency electrode 17 is positioned at color film 15 belows, is the transparent plate electrode, and this second transparency electrode is without the need for specific shape, and it makes material is transparent conductive material, such as tin indium oxide (ITO) etc.
The first transparency electrode 110 is between insulation course 19 and first substrate 11, and this first transparency electrode 110 utilizes mask to make certain shape, such as bar shaped etc.; And whether each first transparency electrode 110 is powered up by the control of Thin Film Transistor (TFT) TFT independently, and then the distribution of control first fluid layer 14 on hydrophobic medium layer 18.
Described first fluid layer 14 for having added the macromolecule alkane with strong reflection particle, because particle can reflect visible light make the first fluid layer present white, is referred to as white reflecting layer between second fluid layer 13 and hydrophobic medium layer 18; Wherein, the macromolecule alkane in the described white reflecting layer is the alkane such as decane, dodecane, and described to have reflexive particle be Titanium dioxide nanoparticle, Pt nanoparticle or silver nano-grain.Simultaneously, described have reflexive particle and macromolecule alkane does not react to each other, and because the relative surface area of this particulate is larger, the buoyancy of the oil that is subject to accordingly is larger, so this particle can be suspended in the macromolecule alkane layer, and macromolecule alkane layer forms suspension jointly.
Described second fluid layer 13 normally with the immiscible electrically conducting transparent liquid of described first fluid layer, can be water or salt solusion between the second transparency electrode 17 and first fluid layer 14.
Hydrophobic medium layer 18 is arranged on the first substrate 11, between first fluid layer 14 and insulation course 19, when not powering up, hydrophobic medium layer 18 and first fluid layer 14 have preferably affinity, first fluid layer 14 can be tiled on the hydrophobic medium layer 18, and the making material of this hydrophobic medium layer 18 comprises teflon, fluororesin or the material that has the performance of little, the antiacid alkali resistant of surface tension, anti-various organic solvents according to P-xylene etc.
Described electric moistening display also is provided be used to the backlight that incident ray is provided at the lower surface of first substrate.
When not applying voltage on the first transparency electrode 110, because the affinity of 18 pairs of first fluid layer 14 of hydrophobic medium layer is greater than the affinity to second fluid layer 13, and make the first fluid layer be tiled in hydrophobic medium layer surface, the light that this moment, backlight sent is fallen by 14 reflection of first fluid layer or scattering, can not see through pixel region, this pixel region shows dark attitude; When applying voltage respectively on the first transparency electrode 110 and the second transparency electrode 17, produce polarization charge on the hydrophobic medium layer 18, the generation of polarization charge can increase the affinity of 18 pairs of second fluid layer 13 of hydrophobic medium layer, second fluid layer 13 can present the state of spreading out makes its free energy be tending towards minimum energy, simultaneously, first fluid layer 14 is expressed to the corner of pixel by second fluid layer 13, and the light that this moment, backlight sent can see through pixel region, forms different coloured light through color film.
Simultaneously, because the voltage of the first transparency electrode changes, so the second fluid layer is not identical to the degree of ordering about of first fluid layer, the reflective surface area of first fluid layer changes, therefore the light quantity of incident light is not identical yet, changes through the brightness of the light of white reflecting layer reflection yet.
Need to prove that the light source of surround lighting was compared and can be ignored with the light source that backlight module provides this moment.
A kind of electric moisten display device that adopts electrowetting technology that the embodiment of the invention two provides, this electric moisten display device is the reflective electrowetting display device, its structure is as shown in Figure 2.As can be seen from Figure 2, the structure of reflective electrowetting display device and transmission-type electric moisten display device is basic identical, in this reflective electrowetting display device, have equally the transparent first substrate 11 and the transparent second substrate 12 that arrange toward each other, it makes material such as glass, resin etc.; And have between two plates and have transparent second fluid layer 13 and first fluid layer 14; Hydrophilic isolation structure 16 becomes a plurality of rectangular areas with the hydrophobic medium layer with spatial separation between the second transparency electrode 17, to form the cavity corresponding to sub-pixel between described first substrate 11 and described second substrate 12, above-mentioned each rectangular area namely is a pixel region of electric wetting principle electric moisten display device.Each pixel cell comprises from top to bottom: second substrate 12, color film 15, the second transparency electrode 17, second fluid layer 13, first fluid layer 14, hydrophobic medium layer 18, insulation course 19, the first transparency electrode 110 and first substrate 11.
Different from the transmission-type electric moisten display device is to also have the light-absorption layer 111 of one deck between insulation course 19 and first substrate 11 in this reflective electrowetting display device.This light-absorption layer 111 is black, by visible light there being the material of strong receptivity make, such as: the carbon nano-tube rete of hollow and many walls etc.
In the reflective electrowetting display device that the embodiment of the invention two provides, when the first transparency electrode 110 does not apply voltage, first fluid layer 14 is tiled on the hydrophobic medium layer 18, the light a that the surround lighting light source sends sees through color film, form different coloured light, then through 14 reflection of first fluid layer, reflection ray a ' sees through the pixel region outgoing again, and this moment, pixel region was bright attitude; Simultaneously, because the voltage that is applied on the first transparency electrode 110 changes, so polar water solution is not identical to the degree of ordering about of first fluid layer 14, the reflecting surface of first fluid layer 14 changes, therefore catoptrical light quantity is not identical yet, changes through the brightness of the light of first fluid layer 14 reflection yet.
When applying voltage respectively on the first transparency electrode 110 and the second transparency electrode 17, can produce polarization charge on the hydrophobic medium layer 18, the generation of this polarization charge can increase the hydrophobic medium layer to the affinity of second fluid layer 13, be extruded to the pixel corner and order about first fluid layer 14, this moment, surround lighting b saw through from second substrate 12, become different coloured light through color film, different coloured light is absorbed by the light-absorption layer 111 on the first substrate 11 after first fluid layer 14 sees through, and this moment, pixel region was dark attitude.
Need to prove, among two embodiment of the present invention color film is set all, this moment, the second fluid layer comprised water or salt solusion, can utilize color film to realize colored the demonstration, certainly color film can also be set, this moment, described second fluid layer comprised water or the salt solusion that contains dyestuff, utilize the color of described dyestuff to realize colored the demonstration, described dyestuff can be disperse blue, because the material of dyestuff all belongs to prior art, therefore not to repeat here.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. electric moisten display device, comprise first substrate and second substrate, space between described first substrate and the described second substrate comprises a plurality of pixel regions, be disposed with the first transparency electrode, hydrophobic medium layer, first fluid layer, second fluid layer, the second transparency electrode from first substrate to second substrate in the described pixel region, it is characterized in that described first fluid layer is white reflecting layer.
2. electric moisten display device as claimed in claim 1 is characterized in that, described white reflecting layer is: the potpourri that comprises macromolecule alkane and reflection grain.
3. electric moisten display device as claimed in claim 2 is characterized in that, described potpourri is suspension.
4. electric moisten display device as claimed in claim 2 is characterized in that, described reflection grain is titania nanoparticles, Pt nanoparticle or silver nano-grain.
5. electric moisten display device as claimed in claim 2 is characterized in that, the macromolecule alkane in the described white reflecting layer is decane or dodecane.
6. electric moisten display device as claimed in claim 1 is characterized in that, also is provided with light-absorption layer between described first substrate and the first transparency electrode.
7. electric moisten display device as claimed in claim 6 is characterized in that, described light-absorption layer is black, and its material comprises the carbon nano-tube rete of hollow and many walls.
8. such as the arbitrary described electric moisten display device of claim 1-7, it is characterized in that, also comprise the color film that is arranged between described second substrate and described the second transparency electrode.
9. electric moisten display device as claimed in claim 8 is characterized in that, described second fluid layer comprises water or salt solusion.
10. such as the arbitrary described electric moisten display device of claim 1-7, it is characterized in that described second fluid layer comprises water or the salt solusion that contains dyestuff.
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| CN201210511239.6A CN102998791B (en) | 2012-12-03 | 2012-12-03 | Electrowetting display device |
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| CN201210511239.6A CN102998791B (en) | 2012-12-03 | 2012-12-03 | Electrowetting display device |
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| US11703675B2 (en) | 2020-04-13 | 2023-07-18 | Tcl China Star Optoelectronics Technology Co., Ltd. | Display panel and manufacturing method thereof |
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| WO2021208210A1 (en) * | 2020-04-13 | 2021-10-21 | Tcl华星光电技术有限公司 | Display panel and manufacturing method therefor |
| US11703675B2 (en) | 2020-04-13 | 2023-07-18 | Tcl China Star Optoelectronics Technology Co., Ltd. | Display panel and manufacturing method thereof |
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