CN107728310B

CN107728310B - Electrowetting color display device based on three-primary-color time mixing method

Info

Publication number: CN107728310B
Application number: CN201710942610.7A
Authority: CN
Inventors: 王俊; 秦德东
Original assignee: Chongqing Bingwei Technology Co ltd
Current assignee: Chongqing Bingwei Technology Co ltd
Priority date: 2017-10-11
Filing date: 2017-10-11
Publication date: 2021-04-06
Anticipated expiration: 2037-10-11
Also published as: CN107728310A

Abstract

The invention provides an electrowetting color display device based on a three-primary-color time mixing method, which comprises three groups of electrowetting structures with different primary colors, wherein the electrowetting structures are arranged in parallel or in a stacked mode and sequentially comprise a first transparent electrode layer, a water layer, an oil film layer, a hydrophobic material layer and a second transparent electrode layer from bottom to top, the three groups of electrowetting structures share the same substrate above, each group of electrowetting structures are provided with capillary pipelines in the water layer and the oil film layer, the lower ends of the capillary pipelines extend into the oil film layer, the upper ends of the capillary pipelines penetrate through the second transparent electrode layer and the substrate, then a reticular or plane-paved display layer is formed above the substrate and extends into the water layer, and the display layers of the three groups of electrowetting structures are overlapped to form a color display surface. The invention controls the color display of the transparent pipeline at the outer side of the electrowetting by applying the capillary pipeline under the action of hydrophilic force, thereby changing the occupation duration of three primary colors in the continuous change of the control voltage of the control device and further changing the color.

Description

Electrowetting color display device based on three-primary-color time mixing method

Technical Field

The present invention relates to a display structure, and more particularly, to an electrowetting color display device based on a three primary color time mixing method.

Background

The EFD may also be called as Electrowetting display (Electrowetting), which is a phenomenon that a liquid drop is deformed and displaced by changing the wettability of the liquid drop on a substrate, i.e., changing a contact angle, by changing a voltage between the liquid drop and an insulating substrate, as shown in fig. 1. By wetting is meant the process of displacing one fluid from a solid surface by another. The liquid can spread on the solid surface, and the solid-liquid contact surface has a tendency of expansion, namely the adhesive force of the liquid to the solid surface is greater than the cohesive force of the liquid, namely wetting. The liquid can not spread on the solid surface, and the contact surface has the tendency of shrinking into a spherical shape, namely, the liquid is not wetted, or the liquid has smaller adhesive force to the solid surface than the cohesive force. The wetting effect of a water-resistant surface can be altered using a voltage (hence the name electrowetting) to make the surface more hydrophilic (wetting). Since the originally hydrophobic surface now becomes more water-absorbing, the inert liquid, such as an oil layer, which was originally in good contact with the hydrophobic surface, has to change its form. This interface property control is the basis for electrowetting applications.

By setting the inert liquid to be displayed as a pixel, it is in principle possible to give the pixel any desired color, thereby obtaining various display results. Electrowetting controls the surface layer of the enclosed liquid by means of a control voltage, resulting in a change of the pixel. When no voltage is applied, a layer of flat film is formed between the colored liquid and the outer layer of the non-hydrophilic and insulating electrode, and the flat film is a colored pixel point. When MOD (adopted by high-pass) is applied between the electrode and the liquid, the new computer glass substrate is separated from the reflective conductive diaphragm through an air gap, and when the thickness of the air gap is reduced to form a separation state, the visible light interference is weakened, and pixel points are blackened.

The three primary color principle is the most basic principle of colorimetry, the three primary colors are independent from each other, and any one primary color cannot be synthesized by other two colors. Red, green and blue are three primary colors, and the color range of the three colors is the most extensive.

The problem of contact angle saturation in electrowetting (wettability no longer increases with increasing voltage when voltage exceeds a certain value) is present, thus limiting the performance and industrial development of many devices.

Capillarity (capillarity) occurs in capillaries where the line is small enough to compare with the radius of curvature of the liquid meniscus. The entire liquid surface in the capillary tube will become curved and the liquid-solid intermolecular interactions may extend through the entire liquid. Common capillary phenomena in daily life, such as water rising in thin glass tubes due to its ability to wet the glass; on the other hand, mercury is reduced in the glass because it does not wet the glass. The reasons for this are all the functions of liquid surface tension and pressure difference between the inside and outside of the curved surface.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and displays colors from the perspective of a three-primary-color spatial mixing method, and the technical scheme is as follows:

the utility model provides an electrowetting color display device based on three primary colors time mixing method, display device includes the electrowetting structure of the different primary colors of three groups of parallels or range upon range of settings, and electrowetting structure from the bottom up includes first transparent electrode layer, water layer, oil film layer, hydrophobic material layer, second transparent electrode layer in proper order, and the same base of three group electrowetting structures in the top sharing, wherein, every electrowetting structure of group is provided with the capillary duct in water layer and oil film layer, the oil film layer is stretched into to the lower extreme of capillary duct, and the upper end passes second transparent electrode layer, base, then square formation netted or plane of spreading form display layer on the base, stretches into the water layer again, and the display layer of three group electrowetting structures overlaps and forms the color display face.

When the voltage of the group of the first transparent electrode layer and the second transparent electrode layer is changed, the lower end of the capillary pipeline is always positioned in the oil film layer material.

The display layers of the three groups of electrowetting structures are the same in shape from top to bottom except for connecting parts with the water layer and the oil film layer.

The capillary channel is positioned at one corner of the single-layer electrowetting structure, and a second transparent electrode layer is not arranged above the corner, so that the oil film layer is only influenced by other water layers.

The capillary pipeline is fixed on the hydrophobic material layer and is fixed through a connecting rod or a supporting groove.

The lower end of the capillary pipeline is provided with a hole which is always positioned in the oil film layer material.

The material of the capillary channel is a material wetted by the oil film layer material.

The three groups of electrowetting structures of different primary colors arranged in parallel or in a stack form a pixel base.

The invention has the beneficial effects that: according to the invention, the capillary tube is introduced, and when the potential is changed, the color display of the transparent tube at the outer side of the electrowetting is controlled under the action of hydrophilic force, so that the occupation duration of three primary colors is changed in the continuous change of the control voltage of the control device, and further the color is changed.

Drawings

Fig. 1 is a schematic diagram of electrowetting;

FIG. 2 is a schematic diagram of an electrowetting structure in accordance with the present invention;

FIG. 3 is a schematic representation of the capillary channel functioning of the electrowetting structure of the present invention;

fig. 4 is a schematic side view of the distribution of the electrowetting structure of the three primary colors of the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

As shown in fig. 2, the electrowetting color display device based on the three primary color time mixing method includes three sets of electrowetting structures of different primary colors arranged in parallel or in a stack.

Electrowetting structure from the bottom up includes first transparent electrode layer 1, water layer 2, oil film layer 3, hydrophobic material layer 4, second transparent electrode layer 5 in proper order, and the same basement 6 of three group electrowetting structures sharing in the top, wherein, every group electrowetting structure is provided with capillary 7 in water layer 2 and oil film layer 3, the lower extreme of capillary 7 stretches into oil film layer 3, and second transparent electrode layer 5, basement 6 are passed to the upper end, then form netted or the plane display layer 8 of spreading the form in basement 6 top, stretch into water layer 2 again, and the display layer of three group electrowetting structures overlaps and forms the color display face. When the voltage of the group of the first transparent electrode layer and the second transparent electrode layer is changed, the lower end of the capillary pipeline is always positioned in the oil film layer material. The display layers of the three groups of electrowetting structures are the same in shape from top to bottom except for connecting parts with the water layer and the oil film layer. The material of the capillary channel is a material wetted by the oil film layer material.

The capillary channels 7 can be located in a corner of the single layer electrowetting structure above which the second transparent electrode layer is not located anymore, so that the oil film layer is only affected by the other water layers. As shown in fig. 3, the first transparent electrode layer 1 and the second transparent electrode layer 5 are applied with voltage, the change of the electric potential makes the hydrophobic material layer 4 start to be hydrophilic, the hydrophilic force formed in this way controls the oil film layer 3 to change shape and become drop-shaped, and because of the problem of saturation by the contact angle, the capillary channel 7 is always made to meet the condition that the lower end is always positioned in the oil film layer material. The capillary pipeline is fixed on the hydrophobic material layer and is fixed through the connecting rod or the supporting groove. The material of the capillary channel is a material wetted by the oil film layer material.

The capillary pipeline is fixed on the hydrophobic material layer and is fixed through a connecting rod or a supporting groove. The lower end of the capillary pipeline is provided with a hole which is always positioned in the oil film layer material.

When the oil film layer 3 and the hydrophobic material layer 4 are restored, the hydrophobic material layer 4 is not hydrophilic any more.

As shown in fig. 4, the first group of electrowetting structures sequentially includes, from bottom to top, a first transparent electrode layer 11, a water layer 12, an oil film layer 13, a hydrophobic material layer 14, and a second transparent electrode layer 15, wherein each group of electrowetting structures is provided with a capillary 17 in the water layer 12 and the oil film layer 13, a lower end of the capillary 17 extends into the oil film layer 13, an upper end of the capillary 17 passes through the second transparent electrode layer 15, then a mesh-shaped or planar-spread-shaped display layer 18 is formed above a substrate 16, and then the display layer extends into the water layer 12.

The electrowetting structure of second group from the bottom up includes first transparent electrode layer 21, water layer 22, oil film layer 23, hydrophobic material layer 24, second transparent electrode layer 25 in proper order, and wherein, every electrowetting structure of group is provided with capillary 27 in water layer 22 and oil film layer 23, capillary 27's lower extreme stretches into oil film layer 23, and second transparent electrode layer 25 is passed to the upper end, then forms netted or the plane display layer 28 of spreading form in base 26 top, stretches into water layer 22 again.

Third group's electrowetting structure from the bottom up includes first transparent electrode layer 31, water layer 32, oil film layer 33, hydrophobic material layer 34, second transparent electrode layer 35 in proper order, and wherein, every electrowetting structure of group is provided with capillary 37 in water layer 32 and oil film layer 33, capillary 37's lower extreme stretches into oil film layer 13, and second transparent electrode layer 35 is passed to the upper end, then forms netted or the plane display layer 38 who spreads the form in base 36 top, stretches into water layer 32 again.

The three sets of electrowetting structures share the same substrate 16 above. The display layers of the three groups of electrowetting structures are the same in shape from top to bottom except for connecting parts with the water layer and the oil film layer.

By controlling the voltage variation, the three electrowetting structures of the color display surface can form visual color when changing the color.

The time mixing method of three primary colors is to project the three primary colors onto the same surface in turn, and the effect of additive color mixing can be achieved due to the inertia of human vision as long as the turning speed is fast enough.

The three groups of electrowetting structures of different primary colors arranged in parallel or in a stack form a pixel base. When the three electrowetting structures are arranged in parallel, they may be arranged in parallel as shown in fig. 4, or may be triangular in plan view.

According to the invention, the capillary tube is introduced, and when the potential is changed, the color display of the transparent tube at the outer side of the electrowetting is controlled under the action of hydrophilic force, so that the occupation duration of three primary colors is changed in the continuous change of the control voltage of the control device, and further the color is changed.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. An electrowetting color display device based on a three primary color time mixing method is characterized in that: the display device comprises three groups of electrowetting structures which are arranged in parallel or in a stacked mode and have different primary colors, the electrowetting structures sequentially comprise a first transparent electrode layer, a water layer, an oil film layer, a hydrophobic material layer and a second transparent electrode layer from bottom to top, the three groups of electrowetting structures share the same substrate on the top, capillary pipelines are arranged in the water layer and the oil film layer in each group of electrowetting structures, the lower ends of the capillary pipelines extend into the oil film layer, the upper ends of the capillary pipelines penetrate through the second transparent electrode layer and the substrate, then a net-shaped or plane-paved display layer is formed on the substrate, the capillary pipelines extend into the water layer, and the display layers of the three groups of electrowetting structures are overlapped to form a color display surface; the capillary channel is positioned at one corner of the single-layer electrowetting structure, the capillary channel is made of a material wetted by an oil film layer material, and when the voltage of the group of the first transparent electrode layer and the second transparent electrode layer is changed, the lower end of the capillary channel is always positioned in the oil film layer; when the electric potential is changed, the color display of the display layer on the outer side of the electrowetting is controlled under the action of hydrophilic force, so that the occupation duration of three primary colors is changed in the continuous change of the control voltage of the control device, and further, the color is changed.

2. An electrowetting color display device based on a three primary color time mixing method according to claim 1, characterized in that: the display layers of the three groups of electrowetting structures are the same in shape from top to bottom except for connecting parts with the water layer and the oil film layer.

3. An electrowetting color display device based on a three primary color time mixing method according to claim 1, characterized in that: and a second transparent electrode layer is not arranged above one corner, provided with the capillary channel, in the single-layer electrowetting structure, so that the oil film layer is only influenced by other water layers.

4. An electrowetting color display device based on a three primary color time mixing method according to claim 1, characterized in that: the capillary pipeline is fixed on the hydrophobic material layer and is fixed through a connecting rod or a supporting groove.

5. An electrowetting color display device based on a three primary color time mixing method according to claim 1, characterized in that: the lower end of the capillary pipeline is provided with a hole which is always positioned in the oil film layer material.

6. An electrowetting color display device based on a three primary color time mixing method according to claim 1, characterized in that: the three groups of electrowetting structures of different primary colors arranged in parallel or in a stack form a pixel base.