KR20150015037A - Reflective display device and method for controlling the same - Google Patents

Abstract

A reflective display device according to the present invention includes a first unit cell which includes a first fluid where charged first particles are distributed, a second unit cell which includes a second fluid where charged second particles are distributed, an electric field applying part which applies an electric field to the first unit cell and the second unit cell, and a control part which controls color displayed from the first unit cell and the second unit cell by controlling the intensity of the applied electric field. The first particles and the second particles are not moved if an electric field having the intensity of less than a threshold value is applied and are moved if an electric field having the intensity of a threshold value or more. The first particles and the second particles are differently set.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a reflective display device,

The present invention relates to a reflective display device and a control method thereof. More particularly, the present invention relates to a method of driving a plurality of unit cells by applying electric fields of various patterns to all of a plurality of unit cells having different minimum intensity (i.e., threshold value) or minimum application time (i.e., response time) The present invention relates to a reflective display apparatus and a control method thereof that can display various colors without having complicated driving means for independently driving unit cells of a display panel.

Reflective display devices are widely used in various fields such as electronic books, mobile displays, outdoor displays and the like because they have advantages of excellent visibility in the open air and excellent low power characteristics.

One typical technique of the reflective display device is an electrophoretic display (EPD) technique in which information is displayed by adjusting the position of charged particles using the principle of electrophoresis in a state where charged particles are dispersed in a dielectric material For example.

However, existing electrophoretic displays have a linear increase in the degree of movement of particles as the intensity of the applied electric field increases. Therefore, it is difficult to drive a conventional electrophoretic display in a passive array manner, TFTs are applied or driven by a segment type in which each of the electrodes is driven separately.

On the other hand, the electrophoretic display can be divided into a dry type moving in the air in which the particles move in accordance with the medium used for moving the particles and a wet type moving in the fluid in which the particles move. Examples of techniques for implementing color in an electrophoretic display include a method using a color filter, a method using color particles or a color fluid, and the like. There is a problem that the color reproducibility is low and the manufacturing cost is increased in the case of using a dual color filter. In the case of using color particles or color fluid, a precise color addressing technique capable of selectively injecting color particles or color fluid is required There is a problem.

Fig. 1 is a diagram exemplarily showing a configuration of a reflective display device (i.e., electrophoretic display) according to the related art. Referring to FIG. 1, a reflective display device 100 that implements color using color fluids 170, 180, 190, and 195 as a reflective type display device 100 driven in a wet manner is shown. In the conventional reflective display device 100 shown in FIG. 1, an electric field is applied to particles 160 having a negative charge or a positive charge dispersed in color fluids 170, 180, 190, and 195 of the capsule 150, The color of the color fluid 170, 180, 190, 195 or the particle 160 may be displayed by causing the color filter 160 to move in the direction of the transparent upper substrate 110 and the upper electrode 120. According to such a conventional reflective display device 100, the lower electrode 140, which can be independently driven for each capsule 150, must be provided in order to independently drive the particles 160 in each capsule 150, The process for manufacturing the reflective display device 100 may be complicated because the capsules 150 and the lower electrodes 140 corresponding to each other must be correctly addressed.

The present invention is applicable to a plurality of unit cells by applying electric fields of various patterns to all of a plurality of unit cells having different minimum intensity (i.e., threshold value) or minimum application time (i.e., response time) It is an object of the present invention to provide a reflective display device and a control method thereof that can display various colors without complicated manufacturing steps or with complicated driving means for independently driving.

A reflective display device according to the present invention includes a first unit cell including a first fluid in which first particles having a charge are dispersed, a second unit cell including a second fluid in which second particles having charge are dispersed, An electric field applying unit for applying an electric field to the first unit cell and the second unit cell and a control unit for controlling the colors displayed from the first unit cell and the second unit cell by adjusting the intensity of the applied electric field, Wherein the first particle and the second particle move when an electric field of less than a respective threshold value is applied and move when an electric field of an intensity not less than a respective threshold value is applied, And the threshold value of the second particle are set to be different from each other.

A reflective display device according to the present invention includes a first unit cell including a first fluid in which first particles having a charge are dispersed, a second unit including a second fluid in which second particles having charge are dispersed, An electric field applying unit for applying an electric field to the first unit cell and the second unit cell by adjusting an application time of the applied electric field, Wherein the first particle and the second particle move when an electric field is applied for a time less than a respective response time and move when an electric field is applied for a time greater than or equal to each response time without moving, And the response time of the first particle and the response time of the second particle are set to be different from each other.

A reflective display device according to the present invention includes a first unit cell including a first fluid in which first particles having a charge are dispersed, a second unit cell including a second fluid in which second particles having charge are dispersed, An electric field applying unit for applying an electric field to the first unit cell and the second unit cell, and at least one of an intensity and an application time of the applied electric field to control the display from the first unit cell and the second unit cell, Wherein the first particle and the second particle do not move when an electric field of less than a respective threshold is applied or an electric field is applied for less than a respective response time, The threshold of the first particle and the threshold of the second particle are different from each other, To set and the response time of the first response time of the first particle and the second particle is characterized in that differently set.

The threshold value of the first particle or the second particle may be determined based on the surface charge, zeta potential, dielectric constant, specific gravity, density, size, shape and structure of the first particle or the second particle, A dielectric constant, a viscosity and a specific gravity of the fluid in which the two particles are dispersed, an additive added in the fluid in which the first particle or the second particle is dispersed, an electrode pattern of the electric field applying portion, Or by adjusting at least one of the first particle or an electric field substantially applied to the second particle by the application unit.

The response time of the first particle or the second particle is determined by the surface charge, zeta potential, dielectric constant, specific gravity, density, size, shape and structure of the first particle or the second particle, A dielectric constant, a viscosity and a specific gravity of the fluid in which the two particles are dispersed, an additive added in the fluid in which the first particle or the second particle is dispersed, an electrode pattern of the electric field applying portion, Or by adjusting at least one of the first particle or an electric field substantially applied to the second particle by the application unit.

When the threshold value of the second particle is set to be larger than the threshold value of the first particle, if an electric field having an intensity lower than the threshold value of the first particle is applied, the first particle and the second particle do not move The first particle is moved by an electric force due to the electric field when an electric field having an intensity lower than a threshold value of the second particle by a threshold value of the first particle is applied, When the electric field is applied, both the first particle and the second particle can move by the electric force due to the electric field.

When the response time of the second particle is set to be larger than the response time of the first particle, if the electric field is applied for less than the response time of the first particle, the first particle and the second particle do not move , When the electric field is applied for a time period shorter than the response time of the first particle and less than the response time of the second particle, the first particle is moved by the electric force due to the electric field, When the electric field is applied, both the first particle and the second particle can move by the electric force due to the electric field.

When the threshold value of the second particle is set to be larger than the threshold value of the first particle and the response time of the first particle is set to be larger than the response time of the second particle, Wherein when an electric field of an intensity is applied for a time less than the response time of the second particle, the first particle and the second particle are both not moving, and an electric field of intensity above the threshold of the second particle is & The second particle is moved by an electric force due to the electric field, and the second particle is moved by an electric force due to the electric field, and the second particle has a strength lower than a threshold of the second particle When the electric field is applied for a time equal to or longer than the response time of the first particle, the first particle is moved by the electric force due to the electric field, Is applied for a time equal to or greater than the response time of the first particle, both the first particle and the second particle can be moved by an electric force due to the electric field.

Wherein the first particle has a first color and the second particle has a second color wherein the first fluid has a third color and the second fluid has a fourth color, Wherein either one of the first to fourth colors is displayed or at least two of the first to fourth colors are displayed according to the movement of either the first particle or the second particle.

A first color layer and a second color layer respectively corresponding to the first unit cell and the second unit cell and arranged in parallel with each other in a direction parallel to the display surface, Wherein the first particle has a first color, the second particle has a second color, the first color layer has a third color, and the second color layer has a third color, Wherein the color of one of the first to fourth colors is displayed according to the movement of either the first particle or the second particle by the applied electric field, At least two of the colors may be mixed and displayed.

The electric field applying unit may include an electrode formed locally only on a partial area on the display surface along a boundary line between the first unit cell and the second unit cell.

The first unit cell and the second unit cell may be defined by a capsule made of a light-transmitting material.

The first unit cell and the second unit cell may be defined by barrier ribs formed in a direction perpendicular to the display surface.

By adjusting at least one of the intensity, direction, application time, number of application, and application period of the applied electric field within a range that does not cross the threshold value of the first particle or the threshold value of the second particle, The intensity can be adjusted.

By adjusting at least one of the intensity, direction, application time, number of application, and application period of the applied electric field within a range that does not cross the response time of the first particle or the response time of the second particle, The intensity can be adjusted.

Wherein the control unit is configured to acquire an input signal relating to information sensed by the at least one sensing unit and to sense the first unit cell and the second unit cell with reference to the obtained input signal, A control signal for the color displayed from the unit cell can be generated.

The at least one sensing unit may include at least one sensor selected from the group consisting of a gyro sensor, a temperature sensor, a humidity sensor, a pressure sensor, an acoustic sensor, an optical sensor, a current sensor, a voltage sensor, a charge sensor, an acidity sensor, And a timer.

A method for controlling a reflection type display device according to the present invention is a method for controlling a reflection type display device including a first unit cell including a first fluid having first particles dispersed therein and a second fluid having second particles dispersed therein, And controlling the color displayed from the first unit cell and the second unit cell by adjusting the intensity of the applied electric field, wherein the color of the first unit cell is controlled by controlling the intensity of the applied electric field, The particle and the second particle move when an electric field having an intensity lower than a respective threshold value is applied and move when an electric field having an intensity equal to or greater than the threshold value is applied and the threshold value of the first particle and the second And the threshold values of the particles are set to be different from each other.

A method for controlling a reflection type display device according to the present invention is a method for controlling a reflection type display device including a first unit cell including a first fluid having first particles dispersed therein and a second fluid having second particles dispersed therein, And controlling a color displayed from the first unit cell and the second unit cell by adjusting an application time of the applied electric field, The first particle and the second particle move when the electric field is applied for a time less than the respective response time and move when the electric field is applied for a time longer than the respective response time without moving, And the response times of the two particles are set to be different from each other.

A method for controlling a reflection type display device according to the present invention is a method for controlling a reflection type display device including a first unit cell including a first fluid having first particles dispersed therein and a second fluid having second particles dispersed therein, And controlling the color displayed from the first unit cell and the second unit cell by adjusting at least one of the intensity of the applied electric field and the application time of the electric field, Wherein the first particle and the second particle do not move when an electric field of less than a respective threshold is applied or an electric field is applied for less than a respective response time, Is applied for a time greater than or equal to the respective response time, the threshold of the first particle and the threshold of the second particle are set differently, The response time of the first particles and the second particles of the response time is characterized in that differently set.

According to the present invention, there is no need to provide a driving means such as a thin film transistor (TFT) necessary for selectively applying a specific electric field, or to form a complex electrode pattern for selectively displaying a plurality of colors, It is possible to display various colors by controlling the intensity or time of the electric field applied to at least one type of unit cell having a different response time.

In addition, according to the present invention, since the unit cells (for example, capsules, banks, barrier ribs, etc.) capable of exhibiting different colors can be arranged precisely according to a specific pattern, A reflective display device capable of displaying various colors can be realized with only a very simple manufacturing process in which only the mixing ratio is adjusted so as to be injected at a time between the driving electrodes.

In addition, according to the present invention, there is no need to use a color filter in order to realize various colors, so that the manufacturing cost can be reduced and the color reproducibility can be enhanced.

According to the present invention, since adjacent unit cells can serve as sub-cells to each other, a separate black matrix (black matrix) for preventing color mixing in the unit cells or between different unit cells It is not necessary to provide the first embodiment.

Fig. 1 is a view showing an exemplary structure of a reflective display device according to the related art.
Fig. 2 is a diagram exemplifying the configuration of a reflective display device according to an embodiment of the present invention.
3 is a diagram illustrating a threshold value of an electric field intensity for moving particles included in each capsule of a reflective display device according to an embodiment of the present invention.
4A to 4P are views illustrating a configuration of applying an electric field of various patterns to a reflective display device according to an embodiment of the present invention.
5 is a diagram exemplarily showing a minimum application time (i.e., response time of particles) of an electric field for moving particles included in each capsule of a reflective display device according to an embodiment of the present invention.
FIGS. 6 to 6P are views illustrating a configuration of applying an electric field of various patterns to a reflective display device according to an embodiment of the present invention.
7 is a diagram exemplarily showing a threshold value of an electric field intensity for moving particles included in each capsule of a reflective display device and a minimum application time (i.e., response time) of an electric field according to an embodiment of the present invention; to be.
8A to 8P are views illustrating a configuration of applying an electric field of various patterns to a reflective display device according to an embodiment of the present invention.
FIG. 9 is a view illustrating an exemplary configuration for adjusting the intensity of a reflective display device by adjusting an application pattern of an electric field according to an embodiment of the present invention. Referring to FIG.
10 is an exemplary illustration of a color combination that may be applied to a capsule of a reflective display device according to an embodiment of the present invention.
11 is a view exemplarily showing a configuration relating to arrangement of capsules in a reflective display device according to an embodiment of the present invention.
Figure 12 is an exemplary illustration of a color combination that may be applied to particles and fluids within a capsule of a reflective display device in accordance with an embodiment of the present invention.
13 is a diagram illustrating an exemplary configuration of a reflective display device having a barrier rib structure according to an embodiment of the present invention.
FIGS. 14A and 14B are views illustrating a configuration of a reflective display device in which two kinds of particles are included in one unit cell according to an embodiment of the present invention. FIG.
FIG. 15 is a view exemplarily showing the configuration of a reflective display device in which rotatable particles are included as a unit cell according to an embodiment of the present invention.
FIG. 16 is a diagram exemplifying a configuration of a dry type reflective display device having a barrier rib structure according to an embodiment of the present invention.
Fig. 17 is a diagram exemplarily showing a configuration of an electro-wet reflective type display device according to an embodiment of the present invention. Fig.
FIG. 18 is a view exemplarily showing a configuration of a reflective display device according to another embodiment of the present invention. FIG.
Figs. 19 to 21 are views showing a configuration of a reflective display device according to another embodiment of the present invention. Fig.
22 is a diagram illustrating a threshold value of an electric field intensity for moving particles contained in each unit cell of a reflective display device according to another embodiment of the present invention.
23A to 23P are views illustrating a configuration of applying an electric field of various patterns to a reflective display device according to another embodiment of the present invention.
24 is a diagram exemplarily showing a minimum application time (i.e., response time) of an electric field for moving particles contained in each unit cell of a reflective display device according to another embodiment of the present invention.
25A to 25P are views showing a configuration of applying an electric field of various patterns to a reflection type display device according to another embodiment of the present invention.
26 is a diagram exemplarily showing threshold values and minimum application times (i.e., response times) of electric field strength for moving particles included in each unit cell of a reflective display device according to another embodiment of the present invention .
27A to 27P are views illustrating a configuration of applying an electric field of various patterns to a reflective display device according to another embodiment of the present invention.
28 is a view exemplarily showing a configuration of a barrier rib of a reflection type display device according to another embodiment of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention.

1. A reflective display device according to an embodiment of the present invention

[Configuration of Reflective Display Device]

Fig. 2 is a diagram exemplifying the configuration of a reflective display device according to an embodiment of the present invention.

2, a reflective display device 200 according to an exemplary embodiment of the present invention may include an upper substrate 210, a lower substrate 220, an upper electrode 230, and a lower electrode 240 . The reflective display device 200 according to an exemplary embodiment of the present invention includes different kinds of particles 261 to 264 and fluids 271 to 274 between the upper electrode 230 and the lower electrode 240 (I. E., Unit cells) 251 to 254, which may be formed of at least one capsule.

It is to be noted that the unit cell referred to in the present specification does not mean a unit pixel referred to in a conventional display device. That is, an upper electrode or a lower electrode independently driven for each unit pixel may be provided, and such unit pixels may be composed of a plurality of unit cells capable of displaying different colors.

According to one embodiment of the present invention, particles 261 through 264 and fluids 271 through 274 contained in at least one capsule 251 through 254 are used to drive (i.e., move or electrophore) The minimum intensity (i.e., threshold) or minimum application time (i.e., response time) of the required electric field can be configured differently.

Specifically, according to one embodiment of the present invention, the first particle 261, the second particle 262, the third particle 263, and the fourth particle 264 are arranged such that the intensity of the applied electric field is smaller than the threshold value The first particles 261, the second particles 262, the third particles 263, and the fourth particles 262. In this case, the first particles 261, the second particles 262, the third particles 263, and the fourth particles 263 can be moved only when the intensity of the applied electric field is equal to or greater than the respective threshold values. 264 may be implemented differently.

In addition, according to one embodiment of the present invention, the first particles 261, the second particles 262, the third particles 263, and the fourth particles 264 are excited for a period of time less than the respective response time The second particles 262, the third particles 263, and the fourth particles 262. In this case, the first particles 261, the second particles 262, the third particles 263, 264 may be implemented differently.

According to one embodiment of the present invention, there is provided a method for controlling a threshold value or a response time of particles contained in a capsule, comprising the steps of: measuring surface charge, zeta potential, dielectric constant, specific gravity, density, The dielectric constant, viscosity and specific gravity of the dispersed fluid, the additive to be added to the particle-dispersed fluid, the electrode pattern of the electrode to apply an electric field to the particles and fluid, the electrode spacing, the electrode size and the electrode material, The electric field applied can be adjusted.

As another example, the particles or the fluid in which the particles are dispersed can be made of a ferroelectric or antiferroelectric material with a steeply increasing or decreasing dielectric constant depending on the electric field. In this case, there is a threshold value of the electric field intensity in which the permittivity of the particle or the fluid suddenly changes, so that there is a threshold value of the electric field intensity which has a decisive influence on the movement or motion of the particle, The particle can move abruptly from the value.

[Operation of Reflective Display Device: Threshold Adjustment]

3 is a diagram illustrating a threshold value of an electric field intensity for moving particles included in each capsule of a reflective display device according to an embodiment of the present invention.

3, the intensity of electric field required to move the first particle 261, the second particle 262, the third particle 263 and the fourth particle 264 of the reflective display device 200 The threshold values are V _T1 , V _T2 , V _T3, and V _T4 (V _T1 < V _T2 < V _T3 < V _T4 ). The first particles 261, the second particles 262, the third particles 263 and the fourth particles 264 may represent white, and the first particles 261, the second particles 262, The first fluid 271, the second fluid 272, the third fluid 273 and the fourth fluid 274 in which the third particle 263 and the fourth particle 264 are dispersed are respectively red, green , Blue and black. According to an embodiment of the present invention, by varying the patterns (i.e., direction and intensity) of the electric field applied to the first to fourth capsules 251 to 254 of the reflective display device 200, At least one color of red, green, blue, and black may be displayed in various ways.

4A to 4P are views illustrating a configuration of applying an electric field of various patterns to a reflective display device according to an embodiment of the present invention.

Referring to FIG. 4A, by applying an electric field having an intensity of V _T4 or more to the first to fourth capsules 251 to 254, the first to fourth particles 261 to 264 are all electrophoretically moved And may be concentrated on the upper electrode 230. Thus, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the first to fourth particles 261 to 264 may be displayed.

Here's how to display one of the four colors except white:

Next, referring to FIG. 4B, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, Only the first particle 261 is moved by electrophoresis by applying an electric field opposite to the electric field applied in Fig. 4A to the V _T1 intensity (i.e., the threshold value of the first particle 261) In the present invention. Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the white color of the second to fourth particles 262 to 264 and the red color of the first fluid 271 are mixed and displayed .

Next, referring to FIG. 4C, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to the V _T2 intensity (i.e., the second particles (262) the threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T1 to the intensity ( (I.e., the threshold value of the first particle 261), only the second particle 262 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the color of the first particles 261, the third particles 263, and the fourth particles 264, And green can be displayed in a mixed manner.

Next, referring to FIG. 4D, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to V _T3 intensity (i.e., the third particle 263, a threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T2 of the century ( (I.e., the threshold value of the second particle 262), only the third particle 263 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the color of the first particles 261, the second particles 262, and the fourth particles 264, And blue of the color of the second color can be displayed mixed.

Next, referring to FIG. 4E, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to V _T4 strength (that is, the fourth particles (264) the threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T3 of the century ( (That is, the threshold value of the third particle 263), only the fourth particles 264 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the color of the first particles 261, the second particles 262, and the third particles 263 and the fourth fluid 274, And black can be displayed mixed.

Here's how to mix two of the four colors except white.

Next, referring to FIG. 4F, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The first particle 261 and the second particle 262 are applied to the electrophoresis by applying an electric field opposite to the electric field applied in Fig. 4A to the V _T2 intensity (i.e., the threshold of the second particle 262) So that it can be concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the color of the third particles 263 and the fourth particles 264, the red color of the first fluid 271, The green color of the color of the fluid 272 can be mixed and displayed.

Next, referring to FIG. 4G, the first to fourth capsules 251 to 254 are formed in the state where the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to V _T3 intensity (i.e., the third particle 263, a threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T1 to the intensity ( (The threshold value of the first particle 261), the second particles 262 and the third particles 263 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the first particles 261 and the fourth particles 264, the green color of the second fluid 272, The color blue of the fluid 273 can be mixed and displayed.

Next, referring to FIG. 4H, the first to fourth capsules 251 to 254 are formed in a state where the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to V _T3 intensity (i.e., the third particle 263, a threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T2 of the century ( (I.e., the threshold of the second particle 262), and then applying an electric field in the opposite direction to the electric field applied in FIG. 4A to the V _T1 intensity (i.e., the threshold of the first particle 261) The particles 261 and the third particles 263 may be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the color of the first particles 261 and the third particles 263, the green color of the second fluid 272, Black which is the color of the fluid 274 can be mixed and displayed.

Next, referring to FIG. 4I, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to V _T4 strength (that is, the fourth particles (264) the threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T2 of the century ( The third particles 263 and the fourth particles 264 can be moved by electrophoresis and concentrated on the lower electrode 240 by applying the second particles 263 and the third particles 263 (i.e., the threshold value of the second particles 262). Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the color of the first particles 261 and the second particles 262, the color of the third fluid 273, Black which is the color of the fluid 274 can be mixed and displayed.

Next, referring to FIG. 4J, the first to fourth capsules 251 to 254 are formed in a state where the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to V _T4 strength (that is, the fourth particles (264) the threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T3 of the century ( (I.e., the threshold value of the third particle 263), and then applying an electric field opposite to the electric field applied in FIG. 4A to the V _T1 intensity (i.e., the threshold value of the first particle 261) The particles 262 and the third particles 263 may be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the color of the second particles 262 and the third particles 263, the red color of the first fluid 271, Black which is the color of the fluid 274 can be mixed and displayed.

Next, referring to FIG. 4K, the first to fourth capsules 251 to 254 are formed in a state where the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to V _T4 strength (that is, the fourth particles (264) the threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T3 of the century ( (I.e., the threshold of the third particle 263), and then applying an electric field in the opposite direction to the electric field applied in FIG. 4A to the V _T2 intensity (i.e., the threshold of the second particle 262) The first particle 261 and the third particle 263 are applied by electrophoresis by applying an electric field in the same direction as the electric field applied in Fig. 4A to the V _T1 intensity (i.e., the threshold of the first particle 261) And may be concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the color of the first particles 261 and the third particles 263, the green color of the second fluid 271, Black which is the color of the fluid 274 can be mixed and displayed.

Here's how to mix three of the four colors except white.

Next, referring to FIG. 4L, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The second particles 262, and the third particles 262 by applying an electric field opposite to the electric field applied in Fig. 4A to the V _T3 intensity (i.e., the threshold of the third particle 263) (263) may be moved by electrophoresis and concentrated on the lower electrode (240). Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the fourth particles 264, the red color of the first fluid 271, and the color of the second fluid 272 The green color and the blue color of the third fluid 273 may be mixed and displayed.

Next, referring to FIG. 4M, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to V _T4 strength (that is, the fourth particles (264) the threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T1 to the intensity ( The third particles 263 and the fourth particles 264 are moved by electrophoresis and concentrated on the lower electrode 240 by applying the second particles 262, the third particles 263 and the fourth particles 264 by electrophoresis . Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the first particles 261, the green color of the second fluid 272, and the color of the third fluid 273 And black, which is the color of the fourth fluid 274, may be mixed and displayed.

Referring to FIG. 4N, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to V _T4 strength (that is, the fourth particles (264) the threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T2 of the century ( (I.e., the threshold of the second particle 262), and then applying an electric field in the opposite direction to the electric field applied in FIG. 4A to the V _T1 intensity (i.e., the threshold of the first particle 261) The particles 261, the third particles 263 and the fourth particles 264 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the color of the second particles 262, the color of the first fluid 271, and the color of the third fluid 273 And black, which is the color of the fourth fluid 274, may be mixed and displayed.

Next, referring to FIG. 4O, the first to fourth capsules 251 to 254 are formed in a state where the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, the electric field and the electric field in the opposite direction, that was applied in Figure 4a with respect to V _T4 strength (that is, the fourth particles (264) the threshold value of) the electric field in the same direction as the applied electric field was in Figure 4a after applying V _T3 of the century ( (I.e., the threshold of the third particle 263) and then applying an electric field in the opposite direction to the electric field applied in FIG. 4A to the V _T2 intensity (i.e., the threshold of the second particle 262) The particles 261, the second particles 262 and the fourth particles 264 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the third particles 263, the red color of the first fluid 271, and the color of the second fluid 272 And the black color of the fourth fluid 274 may be mixed and displayed.

Here's how to mix all four colors except white.

Next, referring to FIG. 4P, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The first to fourth particles 261 to 264 are all subjected to electrophoresis by applying an electric field opposite to the electric field applied in Fig. 4A to the V _T4 intensity (i.e., the threshold value of the fourth particle 264) So that it can be concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the red color of the first fluid 271, the green color of the second fluid 272, and the color of the third fluid 273 Blue and the black color of the fourth fluid 274 may all be mixed and displayed.

[Operation of Reflective Display Device: Response Time Control]

5 is a diagram exemplarily showing a minimum application time (i.e., response time of particles) of an electric field for moving particles included in each capsule of a reflective display device according to an embodiment of the present invention.

5, a minimum amount of electric field required to move the first particles 261, the second particles 262, the third particles 263, and the fourth particles 264 of the reflective display device 200 The time (i.e., response time) is t1, t2, t3 and t4 (T1 < t2 < t3 < t4). The first particles 261, the second particles 262, the third particles 263 and the fourth particles 264 may represent white, and the first particles 261, the second particles 262, The first fluid 271, the second fluid 272, the third fluid 273 and the fourth fluid 274 in which the third particle 263 and the fourth particle 264 are dispersed are respectively red, green , Blue and black. According to an embodiment of the present invention, various patterns of the electric field applied to the first to fourth capsules 251 to 254 of the reflective display device 200 (i.e., the direction and the application time) , And at least one color of red, green, blue, and black may be displayed in various forms.

6A to 6P are views illustrating a configuration of applying an electric field of various patterns to a reflective display device according to an embodiment of the present invention.

Referring to FIG. 6A, the first to fourth particles 261 to 264 are all moved by electrophoresis by applying an electric field to the first capsule through the fourth capsule 251 to 254 for a time equal to or longer than t4. So that it can be concentrated on the upper electrode 230. Thus, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the first to fourth particles 261 to 264 may be displayed.

Here's how to display one of the four colors except white:

Next, referring to FIG. 6B, the first to fourth capsules 251 to 254 are formed in a state where the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, Only the first particles 261 are moved by electrophoresis by applying the electric field opposite to the electric field applied in Fig. 6A for the time t1 (i.e., the response time of the first particle 261) In the present invention. Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the white color of the second to fourth particles 262 to 264 and the red color of the first fluid 271 are mixed and displayed .

Next, referring to FIG. 6C, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The electric field in the same direction as the electric field applied in Fig. 6 (a) is applied to the time of t1 after the application of the electric field in the direction opposite to the electric field applied in Fig. 6A for the time t2 (i.e., the response time of the second particle 262) (I.e., the response time of the first particles 261), only the second particles 262 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the color of the first particles 261, the third particles 263, and the fourth particles 264, And green can be displayed in a mixed manner.

Next, referring to FIG. 6D, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The electric field in the same direction as the electric field applied in Fig. 6A is applied to the time (t2) of t2 after the electric field in the direction opposite to the electric field applied in Fig. 6A is applied for the time t3 (i.e., the response time of the third particle 263) (I.e., the response time of the second particles 262), only the third particles 263 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the color of the first particles 261, the second particles 262, and the fourth particles 264, And blue of the color of the second color can be displayed mixed.

Next, referring to FIG. 6E, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The electric field in the same direction as the electric field applied in Fig. 6A after applying the electric field opposite to the electric field applied in Fig. 6A for the time t4 (i.e., the response time of the fourth particle 264) (I.e., the response time of the third particles 263), only the fourth particles 264 move by electrophoresis and are concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the color of the first particles 261, the second particles 262, and the third particles 263 and the fourth fluid 274, And black can be displayed mixed.

Here's how to mix two of the four colors except white.

Next, referring to FIG. 6F, the first to fourth capsules 251 to 254 are formed in a state where the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The first particle 261 and the second particle 262 are subjected to electrophoresis by applying an electric field in the direction opposite to the electric field applied in Fig. 6A for the time t2 (i.e., the response time of the second particle 262) So that it can be concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the color of the third particles 263 and the fourth particles 264, the red color of the first fluid 271, The green color of the color of the fluid 272 can be mixed and displayed.

Next, referring to FIG. 6G, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The electric field in the same direction as the electric field applied in Fig. 6A after the electric field in the direction opposite to the electric field applied in Fig. 6A is applied for the time t3 (i.e., the response time of the third particle 263) (I.e., the response time of the first particles 261), the second particles 262 and the third particles 263 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the first particles 261 and the fourth particles 264, the green color of the second fluid 272, The color blue of the fluid 273 can be mixed and displayed.

Next, referring to FIG. 6H, the first to fourth capsules 251 to 254 are formed in a state where the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The electric field in the same direction as the electric field applied in Fig. 6A is applied to the time (t2) of t2 after the electric field in the direction opposite to the electric field applied in Fig. 6A is applied for the time t3 (i.e., the response time of the third particle 263) (I.e., the response time of the second particle 262), and then applying the electric field in the opposite direction to the electric field applied in Fig. 6A again for the time t1 (i.e., the response time of the first particle 261) The particles 261 and the third particles 263 may be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the color of the first particles 261 and the third particles 263, the green color of the second fluid 272, Black which is the color of the fluid 274 can be mixed and displayed.

Next, referring to FIG. 6I, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, Figure 6a is the electric field in the opposite direction of the electric field the V _T4 strength of which was in respect to (that is, the fourth particles (264) the threshold value) is applied one after Figure 6a applied electric field direction strength of the electric field V _T2 as was in a ( The third particles 263 and the fourth particles 264 can be moved by electrophoresis and concentrated on the lower electrode 240 by applying the second particles 263 and the third particles 263 (i.e., the threshold value of the second particles 262). Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the color of the first particles 261 and the second particles 262, the color of the third fluid 273, Black which is the color of the fluid 274 can be mixed and displayed.

Next, referring to FIG. 6J, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The electric field in the same direction as the electric field applied in Fig. 6A after applying the electric field opposite to the electric field applied in Fig. 6A for the time t4 (i.e., the response time of the fourth particle 264) (I.e., the response time of the third particle 263), and then applying the electric field in the opposite direction to the electric field applied in Fig. 6A again for the time t1 (i.e., the response time of the first particle 261) The particles 262 and the third particles 263 may be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the color of the second particles 262 and the third particles 263, the red color of the first fluid 271, Black which is the color of the fluid 274 can be mixed and displayed.

Next, referring to FIG. 6K, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The electric field in the same direction as the electric field applied in Fig. 6A after applying the electric field opposite to the electric field applied in Fig. 6A for the time t4 (i.e., the response time of the fourth particle 264) (I.e., the response time of the third particle 263), and then the electric field in the opposite direction to the electric field applied in Fig. 6A is applied for the time t2 (i.e., the response time of the second particle 262) The first particles 261 and the third particles 263 are applied by electrophoresis by applying an electric field in the same direction as the electric field applied in Fig. 6A for a time of t1 (i.e., a response time of the first particles 261) And may be concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an embodiment of the present invention, the color of the first particles 261 and the third particles 263, the green color of the second fluid 271, Black which is the color of the fluid 274 can be mixed and displayed.

Here's how to mix three of the four colors except white.

Next, referring to FIG. 61, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The second particles 262 and the third particles 262 by applying the electric field in the direction opposite to the electric field applied in Fig. 6A to the time t3 (i.e., the response time of the third particles 263) (263) may be moved by electrophoresis and concentrated on the lower electrode (240). Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the fourth particles 264, the red color of the first fluid 271, and the color of the second fluid 272 The green color and the blue color of the third fluid 273 may be mixed and displayed.

Next, referring to FIG. 6M, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, (I.e., the response time of the fourth particles 264), the electric field in the same direction as that of the electric field applied in Fig. 6A is applied to the time of t1 The second particles 262, the third particles 263 and the fourth particles 264 are moved by electrophoresis and concentrated on the lower electrode 240 by applying the first particles 262, . Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the first particles 261, the green color of the second fluid 272, and the color of the third fluid 273 And black, which is the color of the fourth fluid 274, may be mixed and displayed.

Referring to FIG. 6N, the first to fourth capsules 251 to 254 are formed in a state where the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, (I.e., the response time of the fourth particle 264), the electric field in the same direction as the electric field applied in Fig. 6A is applied to the time t2 (i.e., the electric field in the direction opposite to the electric field applied in Fig. (I.e., the response time of the second particle 262), and then applying the electric field in the opposite direction to the electric field applied in Fig. 6A again for the time t1 (i.e., the response time of the first particle 261) The particles 261, the third particles 263 and the fourth particles 264 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the color of the second particles 262, the color of the first fluid 271, and the color of the third fluid 273 And black, which is the color of the fourth fluid 274, may be mixed and displayed.

Next, referring to FIG. 6O, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The electric field in the same direction as the electric field applied in Fig. 6A after applying the electric field opposite to the electric field applied in Fig. 6A for the time t4 (i.e., the response time of the fourth particle 264) (That is, the response time of the third particles 263), and then the electric field in the direction opposite to the electric field applied again in Fig. 6A is applied for the time t2 (i.e., the response time of the second particles 262) The particles 261, the second particles 262 and the fourth particles 264 can be moved by electrophoresis and concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the third particles 263, the red color of the first fluid 271, and the color of the second fluid 272 And the black color of the fourth fluid 274 may be mixed and displayed.

Here's how to mix all four colors except white.

Next, referring to FIG. 6P, the first to fourth capsules 251 to 254 are formed in a state in which the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230, The first to fourth particles 261 to 264 are all subjected to electrophoresis by applying an electric field in the direction opposite to the electric field applied in Fig. 6A to the time t4 (i.e., the response time of the fourth particle 264) So that it can be concentrated on the lower electrode 240. Accordingly, in the reflective display device 200 according to an exemplary embodiment of the present invention, the red color of the first fluid 271, the green color of the second fluid 272, and the color of the third fluid 273 Blue and the black color of the fourth fluid 274 may all be mixed and displayed.

[Operation of Reflective Display Device: Threshold Value and Response Time]

7 is a diagram exemplarily showing a threshold value of an electric field intensity for moving particles included in each capsule of a reflective display device and a minimum application time (i.e., response time) of an electric field according to an embodiment of the present invention; to be.

7, the intensity of electric field required to move the first particle 261, the second particle 262, the third particle 263 and the fourth particle 264 of the reflective display device 200 The thresholds are V _T1 , V _T1 , V _T2 and V _T2 (V _T1 < V _T2 ). The minimum application time of the electric field necessary for moving the first particles 261, the second particles 262, the third particles 263 and the fourth particles 264 of the reflective display device 200 (i.e., Response time) are respectively t1, t2, t1 and t2 (T1 < t2). The first particles 261, the second particles 262, the third particles 263 and the fourth particles 264 may represent white, and the first particles 261, the second particles 262, The first fluid 271, the second fluid 272, the third fluid 273 and the fourth fluid 274 in which the third particle 263 and the fourth particle 264 are dispersed are respectively red, green , Blue and black. According to an embodiment of the present invention, by variously adjusting the patterns (i.e., direction, intensity, and application time) of the electric field applied to the first to fourth capsules 251 to 254 of the reflective display device 200 , At least one of white, red, green, blue, and black may be displayed in various colors.

8A to 8P are views illustrating a configuration of applying an electric field of various patterns to a reflective display device according to an embodiment of the present invention.

Referring to FIG. 8A, an electric field of an intensity of V _T2 or more (i.e., a threshold value of the third particle 263 and the fourth particle 264) with respect to the first to fourth capsules 251 to 254 is t2 (I.e., the response time of the second particle 264 and the fourth particle 264), the first particle 261 through the fourth particle 264 are all moved by electrophoresis to form the upper electrode 230 In the present invention. Thus, in the reflective display device 200 according to an exemplary embodiment of the present invention, the white color of the first to fourth particles 261 to 264 may be displayed.

Next, Figs. 8B to 8E show an embodiment for displaying one of the remaining four colors except white. 8F to 8K show an embodiment in which two of the remaining four colors except for white are mixed and displayed. 8L to 8O show an embodiment in which three of the remaining four colors except for white are mixed and displayed. Fig. 8 (p) shows an embodiment in which white is displayed by mixing all four remaining colors.

8A to 8P correspond to a combination of the embodiments of FIGS. 4A to 4P and the embodiments of FIGS. 6A to 6P, and therefore, a detailed description of the embodiment of FIGS. 8A to 8P is given in FIGS. The explanation of the embodiment of Fig. 4P and the description of the embodiment of Figs. 6A to 6P will be given instead.

On the other hand, in the above embodiment, only when the colors of the first to fourth particles 261 to 264 are all white and the colors of the first to fourth fluids 271 to 272 are red, green, blue and black, respectively The colors of the first to fourth particles 261 to 264 are red, green, blue, and black, respectively, and the colors of the first to fourth fluids 271 to 272 are, respectively, The color of all of the colors may be assumed to be wholly white.

Further, in the above embodiment, only when the first to fourth particles 261 to 264 are all concentrated on the upper electrode 230 by applying an electric field, then an additional electric field is applied to realize various colors However, the present invention is not limited to this. Conversely, by applying an electric field in the opposite direction so that all of the first to fourth particles 261 to 264 are concentrated on the lower electrode 230, an additional electric field is applied It is possible to assume that various colors may be implemented.

[Operation of Reflective Display Device: Brightness Control]

According to an embodiment of the present invention, by adjusting the pattern of the electric field applied to each capsule of the reflective display device 200, the gray scale of the color displayed on the reflective display device 200 can be adjusted .

FIG. 9 is a view illustrating an exemplary configuration for adjusting the intensity of a reflective display device by adjusting an application pattern of an electric field according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 9, an electric field may be applied at an intensity of a predetermined threshold value (V _T ) to realize a specific color. At this time, the intensity of a specific color can be adjusted by adjusting the pulse width, frequency, period or waveform indicating the direction and intensity of the applied electric field (FIG. 9A, FIG. 9B or FIG. 9C) The intensity of a specific color can be adjusted by applying an electric field with an intensity lower than a threshold value (FIG. 9 (d)) after application of an electric field with an intensity of a predetermined color (FIG. 9 (e)). By combining the above-described electric field application methods, the intensities of specific colors can be adjusted (FIG. 9 (f)).

[Operation of reflective display device: color combination]

According to an embodiment of the present invention, various combinations of colors may be applied to the capsules constituting the reflective display device.

10 is an exemplary illustration of a color combination that may be applied to a capsule of a reflective display device according to an embodiment of the present invention.

Referring to FIG. 10, the reflective display device may include two types of capsules each containing two different colored fluids. The reflective display device may include two kinds of capsules in a ratio of 1: 1 (Fig. 10 (a)). [0100] As shown in Fig. Similarly, a reflective display device according to an embodiment of the present invention may include three or four kinds of capsules each containing three or four different color fluids, (B) or FIG. 10 (b) or FIG. 10 (b) or FIG. 10 (c)), or by mixing four types of capsules at a ratio of 1: 1: 1 or 1: (c).

11 is a view exemplarily showing a configuration relating to arrangement of capsules in a reflective display device according to an embodiment of the present invention.

Referring to FIG. 11, a plurality of capsules corresponding to red (R), green (G), blue (B), and black (K, blacK) (FIG. 11A), can be arranged in a square shape and mosaic manner (FIG. 11B), can be repeatedly arranged in a triangle (triangle or delta) (Fig. 11 (c)), and can be repeatedly arranged in a rhombic shape (Fig. 11 (d)).

According to an embodiment of the present invention, various combinations of colors may be applied to particles and fluids included in each capsule constituting the reflective display device.

Figure 12 is an exemplary illustration of a color combination that may be applied to particles and fluids within a capsule of a reflective display device in accordance with an embodiment of the present invention.

Referring to FIGS. 12A and 12B, the red (R), green (G), blue (B), black (K, blacK), and white At least one color may be applied to the particles or fluids.

Referring to FIGS. 12 (c) and 12 (d), cyan (C), magenta (M), yellow (Y), black (K, blacK) At least one color may be applied to the particles or fluids.

Further, in the color combination shown in Fig. 12, the fluid may be made transparent when the particle has a predetermined color.

[Application of Reflective Display Device]

According to an embodiment of the present invention, the reflective display device is not limited to the above-mentioned capsule structure, but can be applied to various structures.

13 is a diagram illustrating a configuration of a reflective display device having a barrier rib structure according to an embodiment of the present invention.

13, particles 1361 to 1364 having specific colors are dispersed in fluids 1371 to 1374 having specific colors for each unit cell 1351 to 1354 divided by the partition 1380 May be included.

Next, FIGS. 14A to 14B are views showing a configuration of a reflective display device in which two kinds of particles are contained in one unit cell according to an embodiment of the present invention.

14, two particles 1461 to 1465 having different colors may be contained in the transparent fluid 1470 in a dispersed state (FIG. 14 (a)) for each of the capsules 1451 to 1454, Two particles 1461 to 1465 having different colors may be dispersed in the transparent fluid 1470 for each of the unit cells 1451 to 1454 divided by the barrier ribs 1480 b)). Here, two particles of different colors may have the same electrophoretic characteristics (i.e., threshold and response time) when an electric field is applied.

FIG. 15 is a view exemplarily showing the configuration of a reflective display device in which rotatable particles are included as a unit cell according to an embodiment of the present invention.

Referring to FIG. 15, particles (so-called twist balls) 1551 to 1554, which are rotated by an applied electric field to exhibit a specific color, are rotated between the upper electrode 1530 and the lower electrode 1540 As shown in FIG.

FIG. 16 is a diagram exemplifying a configuration of a dry type reflective display device having a barrier rib structure according to an embodiment of the present invention.

16, two particles 1661 to 1665 having different colors may be enclosed with transparent air 1670 instead of a fluid for each of the unit cells 1651 to 1654 divided by the partition 1680. Here, two particles of different colors may have the same electrophoretic characteristics (i.e., threshold and response time) when an electric field is applied.

Fig. 17 is a diagram exemplarily showing a configuration of an electro-wet reflective type display device according to an embodiment of the present invention. Fig.

Referring to FIG. 17, oils 1761 to 1764 having a specific color and having different electrowetting characteristics for each of the unit cells 1751 to 1754 separated by the partition 1780 are formed of a transparent fluid (for example, water ) 1770 in a distributed state. Here, oils 1761-1764 having different colors may have different electrophoretic characteristics (i.e., threshold and response times) when an electric field is applied.

Although not shown in the drawing, the characteristic configuration of the reflective display device according to the present invention can also be applied to a liquid crystal display device. That is, according to an embodiment of the present invention, nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal, etc. may be used. These liquid crystals may be an external electric field, an external magnetic field, The arrangement state thereof may be changed and the permittivity may be changed depending on the temperature or the like. Therefore, according to one embodiment of the present invention, by using a liquid crystal in which the arrangement state is changed suddenly when an electric field of a certain intensity or more is applied or an electric field is continuously applied for a specific time, , Resulting in a threshold of the electric field or a response time.

According to an embodiment of the present invention, the characteristic configuration of the reflection type display device according to the present invention can be applied to a display device including a material whose magnetic susceptibility and magnetic polarization amount vary according to a magnetic field.

According to an embodiment of the present invention, the characteristic configuration of the reflective display device according to the present invention can be applied to a photoreaction display device including a material whose optical characteristics change according to light intensity or wavelength.

According to an embodiment of the present invention, the characteristic configuration of the reflective display device according to the present invention can also be applied to a thermal response display device including a material whose optical characteristics change with temperature or heat.

Meanwhile, according to the embodiment of the present invention, the reflective display device may further include a sensing unit (not shown) for acquiring various sensing information. Here, the sensing unit may include at least one of a magnetic field sensor, a gyro sensor, a temperature sensor, a humidity sensor, a pressure sensor, an acoustic sensor, a photosensor, a current sensor, a voltage sensor, a charge sensor, an acidity sensor, And a timer. According to another aspect of the present invention, there is provided a color display device, comprising: an input unit for acquiring an input signal relating to information sensed by a sensing unit; Lt; / RTI &gt; Accordingly, the colors, images, or images displayed on the reflective display device according to the present invention can be adaptively controlled according to the external environment such as magnetic field, temperature, humidity, pressure, light amount, and noise.

2. A reflective display device according to another embodiment of the present invention

[Configuration of Reflective Display Device]

FIG. 18 is a view exemplarily showing a configuration of a reflective display device according to another embodiment of the present invention. FIG.

18, a reflective display device 1800 according to another embodiment of the present invention may include an upper substrate 1810, a lower substrate 1820, an upper electrode 1830, and a lower electrode 1840 . The reflection type display device 1800 according to another embodiment of the present invention is divided into at least one partition 1880 between the upper electrode 1830 and the lower electrode 1840 and different kinds of particles 1861 to 1864 And at least one unit cell 1851 through 1854 including fluids 1871 through 1874. [ In addition, according to another embodiment of the present invention, the particles 1861 to 1864 included in each of the unit cells 1851 to 1854 are all white, and the lower substrate 1820 has different colors for each region corresponding to each unit cell The particles 1861 to 1864 included in each of the unit cells 1851 to 1854 may have different colors and the lower substrate 1820 may include a color layer having each unit (see FIG. 18A) And a color layer having white for all regions corresponding to the cells (Fig. 18 (b)).

18, the lower electrode 1840 of the reflective display device 1800 may be locally formed only on a partial area on the display surface of the reflective display device 1800. [ Specifically, the lower electrode 1840 of the reflective display device 1800 may be locally formed only at a position where the barrier rib 1880 is formed or at a specific position defined for each unit cell, May have a relatively small area as compared with the electrode 1830 and may have an asymmetrical shape with the upper electrode 1830. This allows the color layers 1891 to 1894 formed on the upper substrate 1810 and the lower substrate 1820 to be exposed when the particles 1861 to 1864 are concentrated in the vicinity of the lower electrode 1840. Accordingly, when a predetermined electric field is applied through the lower electrode 1840, the particles 1861 to 1864 in the unit cells 1851 to 1854 move toward the lower electrode 1840 and are concentrated on the lower electrode 1840 In this case, in the reflective display device 1800, the colors of the particles 1861 to 1864 are hardly displayed, and the color of the particles 1861 to 1864 is not displayed. At least one color is mainly displayed (see Figs. 18 (a) and 18 (b)).

Figs. 19 to 21 are views showing a configuration of a reflective display device according to another embodiment of the present invention. Fig.

Referring to FIG. 19, an upper substrate 1910 of a reflective display device 1900 according to another embodiment of the present invention may include a predetermined color layer. Specifically, the particles 1961 to 1964 included in each of the unit cells 1951 to 1954 are all white, and the upper substrate 1910 may include a color layer having a different color for each region corresponding to each unit cell The particles 1961 to 1964 included in each of the unit cells 1951 to 1954 have different colors and the upper substrate 1910 has the same color for all the regions corresponding to each unit cell And a color layer having a white color (Fig. 19 (b)).

20 and 21, the unit cell of the reflective display device 2000 according to another embodiment of the present invention may be composed of capsules 2051 to 2054, and the lower electrode 2040 may include a plurality of The capsule may be locally formed at a position where the capsules meet each other or at a specific position defined for each unit cell. In addition, according to another embodiment of the present invention, the particles 2061 to 2064 included in each of the capsules 2051 to 2054 are all white, and the lower substrate 2020 has a color having a different color for each region corresponding to each capsule (See FIG. 20), the particles 2061 to 2064 included in each of the capsules 2051 to 2054 may have different colors, and the lower substrate 2020 may include all the regions corresponding to the respective unit cells (See Fig. 21)

Meanwhile, according to another embodiment of the present invention, the particles and the fluids contained in at least one unit cell have a minimum intensity (i.e., a threshold value) of the electric field necessary for driving them (i.e., moving or electrophoresis) And the minimum application time (i.e., response time) may be different from each other.

18, the first particles 1861, the second particles 1862, the third particles 1863, and the fourth particles 1864 are arranged such that the intensity of an applied electric field is less than a respective threshold value The first particle 1861, the second particle 1862, the third particle 1863, and the fourth particle 1864 can be moved only when the intensity of the electric field applied is not less than the threshold value. May be implemented differently.

In addition, according to another embodiment of the present invention, the first particle 1861, the second particle 1862, the third particle 1863 and the fourth particle 1864 are arranged such that the electric field is applied for a time less than the respective response time The first particles 1861, the second particles 1862, the third particles 1863, and the fourth particles 1863. In this case, the first particles 1861, the second particles 1862, the third particles 1863, 1864 may be implemented differently.

According to another embodiment of the present invention, there is provided a method for controlling a threshold value or a response time of particles contained in a capsule, comprising the steps of: measuring surface charge, zeta potential, dielectric constant, specific gravity, density, The dielectric constant, viscosity and specific gravity of the dispersed fluid, the additive to be added to the particle-dispersed fluid, the electrode pattern of the electrode to apply an electric field to the particles and fluid, the electrode spacing, the electrode size and the electrode material, The electric field applied can be adjusted.

[Operation of reflective display device: threshold value]

22 is a diagram illustrating a threshold value of an electric field intensity for moving particles contained in each unit cell of a reflective display device according to another embodiment of the present invention.

22, the magnitude of the electric field required to move the first particle 1861, the second particle 1862, the third particle 1863 and the fourth particle 1864 of the reflective display device 1800 The intensity values of the thresholds are V _T1 , V _T2 , V _T3, and V _T4 (V _T1 < V _T2 < V _T3 < V _T4 ). Also, the first particles 1861, the second particles 1862, the third particles 1863 and the fourth particles 1864 may represent white, and the first particles 1861, the second particles 1862, The first color layer 1891, the second color layer 1892, the third color layer 1893, and the fourth color 1893 corresponding respectively to the unit cells including the third particles 1863 and the fourth particles 1864, Layer 1894 may represent red, green, blue, and black, respectively. According to another embodiment of the present invention, by variously adjusting the patterns (i.e., directions and intensities) of the electric field applied to the first to fourth unit cells 1851 to 1854 of the reflective display device 1800, At least one of white, red, green, blue and black colors can be displayed in various ways.

23A to 23P are views illustrating a configuration of applying an electric field of various patterns to a reflective display device according to another embodiment of the present invention.

Referring to FIG. 23A, the first to fourth particles 1861 to 1864 are subjected to electrophoresis by applying an electric field having an intensity of V _T4 or more to the first to fourth unit cells 1851 to 1854, And may be concentrated away from the lower electrode 1830 and near the upper electrode 1830 or may be irregularly dispersed within the unit cells 1851 to 1854. Thus, in the reflective display device 1800 according to another embodiment of the present invention, the color of the first particles 1861 to the fourth particles 1864 can be displayed.

Here's how to display one of the four colors except white:

Next, referring to FIG. 23B, all of the first to fourth particles 1861 to 1864 are located away from the lower electrode 1830 and concentrated around the upper electrode 1830, The electric field in the direction opposite to the electric field applied in Fig. 23A to the first to fourth unit cells 1851 to 1854 is V _T1 intensity (i.e., the first particle 1861) So that only the first particles 1861 move by electrophoresis and can be concentrated on the lower electrode 1840 and positioned there. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white of the second to fourth particles 1862 to 1864 and the red of the first color layer 1891 are mixed Can be displayed.

Next, referring to FIG. 23C, the first to fourth particles 1861 to 1864 are all located away from the lower electrode 1830, concentrated around the upper electrode 1830, or located in each unit cell 1851 to 1854, The electric field in the direction opposite to the electric field applied in Fig. 23A to the first unit cell to the fourth unit cell 1851 to 1854 is V _T2 intensity (i.e., the second particle 1862) By applying an electric field in the same direction as the electric field applied in Fig. 23A to the V _T1 intensity (i.e., the threshold value of the first particle 1861) after the second particle 1862 is applied And may be concentrated on the lower electrode 1840. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white color of the first particles 1861, the third particles 1863, and the fourth particles 1864 and the color of the second color layer 1892 ) Can be mixed and displayed.

Next, referring to FIG. 23D, the first to fourth particles 1861 to 1864 are all located away from the lower electrode 1830 and concentrated around the upper electrode 1830, or are located in the unit cells 1851 to 1854, The electric field in the direction opposite to the electric field applied in Fig. 23A to the first to fourth unit cells 1851 to 1854 is V _T3 intensity (i.e., the third particle 1863) By applying an electric field in the same direction as the electric field applied in Fig. 23A to the V _T2 intensity (i.e., the threshold of the second particle 1862) after the application of the third particle 1863 And may be concentrated on the lower electrode 1840. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white color of the first particles 1861, the second particles 1862 and the fourth particles 1864 and the color of the third color layer 1893 ) May be mixed and displayed.

Next, referring to FIG. 23E, the first to fourth particles 1861 to 1864 are all located away from the lower electrode 1830 and concentrated near the upper electrode 1830, or are located in the unit cells 1851 to 1854, The electric field in the direction opposite to the electric field applied in FIG. 23A to the first to fourth unit cells 1851 to 1854 is V _T4 intensity (i.e., the fourth particle 1864) (I.e., the threshold value of the third particle 1863), the electric field in the same direction as the electric field applied in Fig. 23A is applied to the V _T3 intensity (i.e., the threshold value of the third particle 1863) And may be concentrated on the lower electrode 1840. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white color of the first particles 1861, the second particles 1862, and the third particles 1863 and the white color of the fourth color layer 1894 ) May be mixed and displayed.

Here's how to mix two of the four colors except white.

Next, referring to FIG. 23F, all of the first to fourth particles 1861 to 1864 are located away from the lower electrode 1830 and concentrated near the upper electrode 1830, or are located in the unit cells 1851 to 1854, The electric field in the direction opposite to the electric field applied in Fig. 23A to the first unit cell to the fourth unit cell 1851 to 1854 is V _T2 intensity (i.e., the second particle 1862) The first particles 1861 and the second particles 1862 can be moved by electrophoresis and concentrated on the lower electrode 1840. [ Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white color of the third particles 1863 and the fourth particles 1864 and the red color of the first color layer 1891 And the green color of the color of the two-color layer 1892 can be mixed and displayed.

23G, the first to fourth particles 1861 to 1864 are all located away from the lower electrode 1830 and concentrated around the upper electrode 1830, or are located in the unit cells 1851 to 1854, The electric field in the direction opposite to the electric field applied in Fig. 23A to the first to fourth unit cells 1851 to 1854 is V _T3 intensity (i.e., the third particle 1863) By applying an electric field in the same direction as the electric field applied in Figure 23A to the V _T1 intensity (i. E., The threshold of the first particle 1861) after the application of the second particle 1862 and the third particle 1863 may be moved by electrophoresis and concentrated on the lower electrode 1840. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white color of the first particles 1861 and the fourth particles 1864, the green color of the second color layer 1892, And the color blue of the three-color layer 1893 may be mixed and displayed.

Next, referring to FIG. 23H, the first to fourth particles 1861 to 1864 are all located away from the lower electrode 1830 and concentrated near the upper electrode 1830, The electric field in the direction opposite to the electric field applied in Fig. 23A to the first to fourth unit cells 1851 to 1854 is V _T3 intensity (i.e., the third particle 1863) After the application of the electric field in the same direction as the electric field applied in Fig. 23A to the V _T2 intensity (i.e., the threshold of the second particle 1862) after the application of the electric field in the direction opposite to the electric field applied in Fig. The first particle 1861 and the third particle 1863 are moved by electrophoresis to concentrate on the lower electrode 1840 by applying the electric field of the first particle 1861 to the V _T1 intensity (i.e., the threshold value of the first particle 1861) . Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white color of the first particles 1861 and the third particles 1863, the green color of the second color layer 1892, The black color, which is the color of the four-color layer 1894, may be mixed and displayed.

Next, referring to FIG. 23 (i), the first to fourth particles 1861 to 1864 are all located away from the lower electrode 1830 and concentrated to the vicinity of the upper electrode 1830, The electric field in the direction opposite to the electric field applied in FIG. 23A to the first to fourth unit cells 1851 to 1854 is V _T4 intensity (i.e., the fourth particle 1864) By applying the electric field in the same direction as the electric field applied in Figure 23A to the V _T2 intensity (i.e., the threshold of the second particle 1862) after the application of the third particle 1863 and the fourth particle 1864 may be moved by electrophoresis and concentrated on the lower electrode 1840. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white of the first particles 1861 and the second particles 1862 and the blue of the third color layer 1893, The black color, which is the color of the four-color layer 1894, may be mixed and displayed.

Next, referring to FIG. 23J, all of the first particles 1861 to the fourth particles 1864 are located away from the lower electrode 1830 and concentrated to the vicinity of the upper electrode 1830, or are located in the unit cells 1851 to 1854, The electric field in the direction opposite to the electric field applied in FIG. 23A to the first to fourth unit cells 1851 to 1854 is V _T4 intensity (i.e., the fourth particle 1864) After applying the electric field in the same direction as the electric field applied in Fig. 23A to the V _T3 intensity (i.e., the threshold value of the third particle 1863) after the application of the electric field in the direction opposite to the electric field applied in Fig. The second particles 1862 and the third particles 1863 are moved by electrophoresis and concentrated on the portion of the lower electrode 1840 by applying the electric field of the first particle 1862 to the V _T1 intensity (i.e., the threshold value of the first particle 1861) . Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the color of the second particles 1862 and the third particles 1863 and the color of the first color layer 1891, The black color, which is the color of the four-color layer 1894, may be mixed and displayed.

Next, referring to FIG. 23K, all of the first to fourth particles 1861 to 1864 are located away from the lower electrode 1830 and concentrated near the upper electrode 1830, or are located in the unit cells 1851 to 1854, The electric field in the direction opposite to the electric field applied in FIG. 23A to the first to fourth unit cells 1851 to 1854 is V _T4 intensity (i.e., the fourth particle 1864) After applying the electric field in the same direction as the electric field applied in Fig. 23A to the V _T3 intensity (i.e., the threshold value of the third particle 1863) after the application of the electric field in the direction opposite to the electric field applied in Fig. intensity of electric field V _T2 (i.e., the second particles (1862) a threshold value) by again Figure 23a is an electric field direction strength of the electric field V _T1 as was in after the application (that is, the first particles (1861) Threshold value), the first particles 1861 and the third particles 1863 are electrically Is moved by the copper concentration in the lower electrode 1840 portion may be positioned. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white color of the first particles 1861 and the third particles 1863, the green color of the second color layer 1892, The black color, which is the color of the four-color layer 1894, may be mixed and displayed.

Here's how to mix three of the four colors except white.

231, all of the first to fourth particles 1861 to 1864 are located away from the lower electrode 1830 and are concentrated near the upper electrode 1830 or are located in the unit cells 1851 to 1854, The electric field in the direction opposite to the electric field applied in Fig. 23A to the first to fourth unit cells 1851 to 1854 is V _T3 intensity (i.e., the third particle 1863) The first particles 1861, the second particles 1862 and the third particles 1863 can be moved by electrophoresis and concentrated on the lower electrode 1840 by being applied to the lower electrode 1840 as shown in FIG. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white color of the fourth particles 1864 and the red color of the first color layer 1891 and the red color of the second color layer 1892 The color of green and the color of the third color layer 1893 may be mixed and displayed.

Next, referring to FIG. 23M, all of the first to fourth particles 1861 to 1864 are located away from the lower electrode 1830 and concentrated near the upper electrode 1830, or are located in the unit cells 1851 to 1854, The electric field in the direction opposite to the electric field applied in FIG. 23A to the first to fourth unit cells 1851 to 1854 is V _T4 intensity (i.e., the fourth particle 1864) By applying an electric field in the same direction as the electric field applied in Figure 23A to the V _T1 intensity (i.e., the threshold of the first particle 1861) after application of the second particle 1862, the third particle 1860, 1863 and the fourth particles 1864 may be moved by electrophoresis and concentrated on the lower electrode 1840. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white color of the first particles 1861, the green color of the second color layer 1892, and the green color of the third color layer 1893 And a black color, which is the color of the fourth color layer 1894, may be mixed and displayed.

Next, referring to FIG. 23N, all of the first particles 1861 to the fourth particles 1864 are located away from the lower electrode 1830, concentrated near the upper electrode 1830, or located in each unit cell 1851 to 1854, The electric field in the direction opposite to the electric field applied in FIG. 23A to the first to fourth unit cells 1851 to 1854 is V _T4 intensity (i.e., the fourth particle 1864) After the application of the electric field in the same direction as the electric field applied in Fig. 23A to the V _T2 intensity (i.e., the threshold of the second particle 1862) after the application of the electric field in the direction opposite to the electric field applied in Fig. The first particles 1861, the third particles 1863 and the fourth particles 1864 are moved by electrophoresis by applying the electric field of the first particle 1861 to the V _T1 intensity (i.e., the threshold value of the first particle 1861) The electrode 1840 can be concentrated. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white of the second particle 1862, the red of the first color layer 1891 and the red of the third color layer 1893 And a black color, which is the color of the fourth color layer 1894, may be mixed and displayed.

Next, referring to FIG. 23O, all of the first particles 1861 to the fourth particles 1864 are located away from the lower electrode 1830 and concentrated around the upper electrode 1830, or are located in the unit cells 1851 to 1854, The electric field in the direction opposite to the electric field applied in FIG. 23A to the first to fourth unit cells 1851 to 1854 is V _T4 intensity (i.e., the fourth particle 1864) After applying the electric field in the same direction as the electric field applied in Fig. 23A to the V _T3 intensity (i.e., the threshold value of the third particle 1863) after the application of the electric field in the direction opposite to the electric field applied in Fig. The first particles 1861, the second particles 1862 and the fourth particles 1864 are moved by electrophoresis by applying the electric field of the first particle 1861 to the V _T2 intensity (that is, the threshold value of the second particle 1862) The electrode 1840 can be concentrated. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the white color of the third particles 1863 and the red color of the first color layer 1891 and the red color of the second color layer 1892 And the black color, which is the color of the fourth color layer 1894, can be mixed and displayed.

Here's how to mix all four colors except white.

Next, referring to FIG. 23P, all of the first particles 1861 to the fourth particles 1864 are located away from the lower electrode 1830 and concentrated around the upper electrode 1830, or are located in the unit cells 1851 to 1854, The electric field in the direction opposite to the electric field applied in FIG. 23A to the first to fourth unit cells 1851 to 1854 is V _T4 intensity (i.e., the fourth particle 1864) The first to fourth particles 1861 to 1864 are all moved by electrophoresis to be concentrated on the lower electrode 1840 and positioned. Accordingly, in the reflective display device 1800 according to another embodiment of the present invention, the color red of the first color layer 1891, the green color of the second color layer 1892 and the color of the third color layer 1893, And the black color of the fourth color layer 1894 may all be mixed and displayed.

[Operation of Reflective Display Device: Response Time]

24 is a diagram exemplarily showing a minimum application time (i.e., response time) of an electric field for moving particles contained in each unit cell of a reflective display device according to another embodiment of the present invention.

24, a minimum amount of electric field required to move the first particles 1861, the second particles 1862, the third particles 1863, and the fourth particles 1864 of the reflective display device 1800 The time (i.e., response time) is t1, t2, t3 and t4 (T1 < t2 < t3 < t4). Also, the first particles 1861, the second particles 1862, the third particles 1863 and the fourth particles 1864 may represent white, and the first particles 1861, the second particles 1862, The first color layer 1891, the second color layer 1892, the third color layer 1893, and the fourth color 1893 corresponding respectively to the unit cells including the third particles 1863 and the fourth particles 1864, Layer 1894 may represent red, green, blue, and black, respectively. According to another embodiment of the present invention, by variously adjusting the pattern (i.e., the direction and the application time) of the electric field applied to the first to fourth unit cells 1851 to 1854 of the reflective display device 1800 , At least one of white, red, green, blue, and black may be displayed in various colors.

25A to 25P are views showing a configuration of applying an electric field of various patterns to a reflection type display device according to another embodiment of the present invention.

First, referring to FIG. 25A, by applying an electric field for a time t4 (i.e., the response time of the fourth particle 1864) to the first to fourth unit cells 1851 to 1854, ) To the fourth particles 1864 are all moved by electrophoresis to be concentrated from the lower electrode 1830 to the vicinity of the upper electrode 1830 or dispersed irregularly within each unit cell 1851 to 1854 have. Thus, in the reflective display device 1800 according to another embodiment of the present invention, the color of the first particles 1861 to the fourth particles 1864 can be displayed.

Next, Figs. 25B to 25E show an embodiment for displaying one of the remaining four colors except white. In addition, Figs. 25F to 25K show an embodiment in which two of the remaining four colors except for white are mixed and displayed. 251 to 25o show an embodiment in which three of the remaining four colors except for white are mixed and displayed. In addition, Fig. 25P shows an example in which white is displayed by mixing all four remaining colors.

25A to 25P can be easily understood by referring to the embodiments of FIGS. 6A to 6P and the embodiments of FIGS. 23A to 23P, which have been described above. Therefore, a detailed description of the embodiment of FIGS. 25A to 25P The description of the embodiment of Figs. 6A to 6P and the description of the embodiment of Figs. 23A to 23P will be omitted.

[Operation of Reflective Display Device: Threshold Value and Response Time]

26 is a diagram exemplarily showing threshold values and minimum application times (i.e., response times) of electric field strength for moving particles included in each unit cell of a reflective display device according to another embodiment of the present invention .

Referring to Fig. 26, the intensity of the electric field required to move the first particle 1861, the second particle 1862, the third particle 1863 and the fourth particle 1864 of the reflective display device 1800 The thresholds are V _T1 , V _T1 , V _T2 and V _T2 (V _T1 < V _T2 ). The minimum application time of the electric field necessary for moving the first particles 1861, the second particles 1862, the third particles 1863 and the fourth particles 1864 of the reflective display device 1800 (i.e., Response time) are respectively t1, t2, t1 and t2 (T1 < t2). Also, the first particles 1861, the second particles 1862, the third particles 1863 and the fourth particles 1864 may represent white, and the first particles 1861, the second particles 1862, The first color layer 1891, the second color layer 1892, the third color layer 1893, and the fourth color 1893 corresponding respectively to the unit cells including the third particles 1863 and the fourth particles 1864, Layer 1894 may represent red, green, blue, and black, respectively. According to another embodiment of the present invention, by variously adjusting the pattern (i.e., the direction and the application time) of the electric field applied to the first to fourth unit cells 1851 to 1854 of the reflective display device 1800 , At least one of white, red, green, blue, and black may be displayed in various colors.

27A to 27P are views illustrating a configuration of applying an electric field of various patterns to a reflective display device according to another embodiment of the present invention.

Referring to FIG. 27A, an electric field of an intensity of V _T2 or more (i.e., a threshold value of the third particle 1863 and the fourth particle 1864) is applied to the first to fourth unit cells 1851 to 1854, The first particles 1861 to the fourth particles 1864 are all moved by electrophoresis by applying the time t2 (i.e., the response time of the second particle 1864 and the fourth particle 1864) (1830 to 1854) and may be irregularly dispersed in the unit cells (1851 to 1854). Thus, in the reflective display device 1800 according to another embodiment of the present invention, the color of the first particles 1861 to the fourth particles 1864 can be displayed.

Next, Figs. 27B to 27E show an embodiment for displaying one of the remaining four colors except white. In addition, Figs. 27F to 27K show an embodiment in which two of the remaining four colors except for white are mixed and displayed. Also, Figs. 271 to 27o show an embodiment in which three of the remaining four colors except for white are mixed and displayed. Also, Fig. 27 (p) shows an embodiment in which white is displayed by mixing all four remaining colors.

27A to 27P correspond to a combination of the embodiment of FIGS. 23A to 23P and the embodiment of FIGS. 25A to 25P. Therefore, a detailed description of the embodiment of FIGS. 27A to 27P is given in FIGS. The description of the embodiment of Fig. 23P and the description of the embodiment of Figs. 25A to 25P will be given instead.

[Operation of Reflective Display Device: Brightness Control]

According to another embodiment of the present invention, by adjusting the pattern of the electric field applied to each capsule of the reflective display device 1800, the gray scale of the color displayed on the reflective display device 1800 can be adjusted .

FIG. 9 is a view illustrating a configuration for adjusting the intensity of light of a reflective display device by adjusting an application pattern of an electric field according to another embodiment of the present invention. Referring to FIG.

Referring to FIG. 9, an electric field may be applied at an intensity of a predetermined threshold value (V _T ) to realize a specific color. At this time, the intensity of a specific color can be adjusted by adjusting the pulse width, frequency, period or waveform indicating the direction and intensity of the applied electric field (FIG. 9A, FIG. 9B or FIG. 9C) The intensity of a specific color can be adjusted by applying an electric field with an intensity lower than a threshold value (FIG. 9 (d)) after application of an electric field with an intensity of a predetermined color (FIG. 9 (e)). By combining the above-described electric field application methods, the intensities of specific colors can be adjusted (FIG. 9 (f)).

[Operation of reflective display device: color combination]

Meanwhile, according to another embodiment of the present invention, various combinations of colors may be applied to the capsules constituting the reflective display device.

10 is an exemplary illustration of a color combination that can be applied to a capsule of a reflective display device according to another embodiment of the present invention.

Referring to FIG. 10, the reflective display device may include two types of capsules each containing two different colored fluids. The reflective display device may include two kinds of capsules in a ratio of 1: 1 (Fig. 10 (a)). [0100] As shown in Fig. Likewise, a reflective display device according to another embodiment of the present invention may include three or four kinds of capsules each containing three or four different color fluids, (B) or FIG. 10 (b) or FIG. 10 (b) or FIG. 10 (c)), or by mixing four types of capsules at a ratio of 1: 1: 1 or 1: (c).

Fig. 11 is a view exemplarily showing a configuration relating to arrangement of capsules of a reflective display device according to another embodiment of the present invention. Fig.

Referring to FIG. 11, a plurality of capsules corresponding to red (R), green (G), blue (B), and black (K, blacK) (FIG. 11A), can be arranged in a square shape and mosaic manner (FIG. 11B), can be repeatedly arranged in a triangle (triangle or delta) (Fig. 11 (c)), and can be repeatedly arranged in a rhombic shape (Fig. 11 (d)).

According to another embodiment of the present invention, various combinations of colors may be applied to particles and fluids included in each capsule constituting the reflective display device.

12 is an exemplary illustration of a color combination that may be applied to particles and fluids within a capsule of a reflective display device according to another embodiment of the present invention.

Referring to FIGS. 12A and 12B, the red (R), green (G), blue (B), black (K, blacK), and white At least one color may be applied to the particles or fluids.

Referring to FIGS. 12 (c) and 12 (d), cyan (C), magenta (M), yellow (Y), black (K, blacK) At least one color may be applied to the particles or fluids.

Further, in the color combination shown in Fig. 12, the fluid may be made transparent when the particle has a predetermined color.

[Fabrication of reflective display device]

According to another embodiment of the present invention, capsules of different colors mixed at a predetermined ratio can be stacked at a time between the upper substrate and the lower substrate of the reflective display device. According to another embodiment of the present invention, a barrier rib structure is formed between an upper substrate and a lower substrate of a reflective display device, and then particles and a fluid are injected between the barrier ribs using an inkjet injection method and then sealed . According to another embodiment of the present invention, a barrier rib structure is formed between an upper substrate and a lower substrate of a reflective display device, and then a barrier rib structure is formed between the upper substrate and the lower substrate by using a vacuum injection method or an injection method using capillary phenomenon, Particles and fluids can be injected.

28 is a view exemplarily showing a configuration of a barrier rib of a reflection type display device according to another embodiment of the present invention.

28 (a)), a stripe pattern (FIG. 28 (b)), a lattice pattern (see FIG. 28 c) or the like may be formed.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

100: Reflective display device according to the related art
200, 1800: reflection type display device according to the present invention
210, 1810: upper substrate
220, 1820: Lower substrate
230, 1830: upper electrode
240, 1840: Lower electrode
251 to 254, 1851 to 1854:
261 to 264, 1861 to 1864: particles
271 to 274, 1870: fluid

Claims (19)

A first unit cell including a first fluid in which first particles having a charge are dispersed,
A second unit cell including a second fluid in which a second particle having a charge is dispersed,
An electric field applying unit for applying an electric field to the first unit cell and the second unit cell,
And controlling the color displayed from the first unit cell and the second unit cell by adjusting the intensity of the applied electric field,
, &Lt; / RTI &
Wherein the first particle and the second particle move when an electric field having an intensity lower than a threshold value is applied,
Wherein a threshold value of the first particle and a threshold value of the second particle are set differently from each other. A first unit cell including a first fluid in which first particles having a charge are dispersed,
A second unit cell including a second fluid in which a second particle having a charge is dispersed,
An electric field applying unit for applying an electric field to the first unit cell and the second unit cell,
A control unit for controlling a color displayed from the first unit cell and the second unit cell by adjusting an application time of the applied electric field,
, &Lt; / RTI &
Wherein the first particle and the second particle move when an electric field is applied for a time less than the respective response time and move when an electric field is applied for a time longer than the respective response time without moving,
Wherein the response time of the first particle and the response time of the second particle are set differently from each other. A first unit cell including a first fluid in which first particles having a charge are dispersed,
A second unit cell including a second fluid in which a second particle having a charge is dispersed,
An electric field applying unit for applying an electric field to the first unit cell and the second unit cell,
And controlling the color displayed from the first unit cell and the second unit cell by adjusting at least one of the intensity of the applied electric field and the application time,
, &Lt; / RTI &
Wherein the first particle and the second particle do not move when an electric field of less than a respective threshold is applied or an electric field is applied for less than a respective response time, If it is applied for more than the response time,
Wherein a threshold value of the first particle and a threshold value of the second particle are set different from each other, and the response time of the first particle and the response time of the second particle are set to be different from each other. 4. The method according to any one of claims 1 to 3,
The threshold value of the first particle or the second particle may be determined based on the surface charge, zeta potential, dielectric constant, specific gravity, density, size, shape and structure of the first particle or the second particle, A dielectric constant, a viscosity and a specific gravity of the fluid in which the two particles are dispersed, an additive added in the fluid in which the first particle or the second particle is dispersed, an electrode pattern of the electric field applying portion, And an electric field substantially applied to the first particle or the second particle by an application unit. 4. The method according to any one of claims 2 and 3,
The response time of the first particle or the second particle is determined by the surface charge, zeta potential, dielectric constant, specific gravity, density, size, shape and structure of the first particle or the second particle, A dielectric constant, a viscosity and a specific gravity of the fluid in which the two particles are dispersed, an additive added in the fluid in which the first particle or the second particle is dispersed, an electrode pattern of the electric field applying portion, And an electric field substantially applied to the first particle or the second particle by an application unit. The method according to claim 1,
When the threshold value of the second particle is set to be larger than the threshold value of the first particle,
Wherein when an electric field having an intensity lower than a threshold value of the first particle is applied, both the first particle and the second particle do not move,
The first particle is moved by an electric force due to the electric field when an electric field having an intensity lower than a threshold value of the second particle by a threshold value of the first particle is applied,
Wherein when an electric field having an intensity equal to or higher than a threshold value of the second particle is applied, both the first particle and the second particle move due to the electric force due to the electric field. 3. The method of claim 2,
When the response time of the second particle is set larger than the response time of the first particle,
Wherein when the electric field is applied for less than the response time of the first particle, the first particle and the second particle do not move,
When the electric field is applied for a time period shorter than the response time of the first particle and less than the response time of the second particle, the first particle moves by the electric force due to the electric field,
Wherein when the electric field is applied for a time equal to or longer than the response time of the second particle, both the first particle and the second particle move by the electric force due to the electric field. The method of claim 3,
When the threshold value of the second particle is set to be larger than the threshold value of the first particle and the response time of the first particle is set larger than the response time of the second particle,
If the electric field having an intensity lower than the threshold of the first particle is applied for a time less than the response time of the second particle, the first particle and the second particle do not move,
The second particle is moved by an electric force due to the electric field when an electric field having an intensity higher than a threshold value of the second particle is applied for a time period shorter than a response time of the second particle,
The first particle is moved by an electric force due to the electric field when an electric field having an intensity lower than a threshold value of the first particle and lower than a threshold value of the first particle is applied for a time longer than a response time of the first particle,
Characterized in that both the first particle and the second particle are moved by an electric force due to the electric field when an electric field having an intensity not less than a threshold value of the second particle is applied for a time equal to or longer than the response time of the first particle. Type display device. 4. The method according to any one of claims 1 to 3,
Wherein the first particle has a first color, the second particle has a second color, the first fluid has a third color, the second fluid has a fourth color,
Wherein either one of the first to fourth colors is displayed according to the movement of either the first particle or the second particle by the applied electric field or at least two colors of the first to fourth colors Is displayed on the display unit. 4. The method according to any one of claims 1 to 3,
A first color layer and a second color layer respectively corresponding to the first unit cell and the second unit cell and arranged in parallel with each other in a direction parallel to the display surface,
Wherein the electric field applying unit includes an electrode formed locally only in a partial area on the display surface,
Wherein the first particle has a first color, the second particle has a second color, the first color layer has a third color, the second color layer has a fourth color,
Wherein either one of the first to fourth colors is displayed according to the movement of either the first particle or the second particle by the applied electric field or at least two colors of the first to fourth colors Are displayed in a mixed manner. 4. The method according to any one of claims 1 to 3,
Wherein the first unit cell and the second unit cell are defined by a capsule made of a light-transmitting material. 4. The method according to any one of claims 1 to 3,
Wherein the first unit cell and the second unit cell are defined by barrier ribs formed in a direction perpendicular to the display surface. 4. The method according to any one of claims 1 to 3,
By adjusting at least one of the intensity, direction, application time, number of application, and application period of the applied electric field within a range that does not cross the threshold value of the first particle or the threshold value of the second particle, And the intensity of light is adjusted. 4. The method according to any one of claims 2 and 3,
By adjusting at least one of the intensity, direction, application time, number of application, and application period of the applied electric field within a range that does not cross the response time of the first particle or the response time of the second particle, And the intensity of light is adjusted. 4. The method according to any one of claims 1 to 3,
Further comprising at least one sensing portion,
The control unit obtains an input signal relating to information sensed by the at least one sensing unit and controls the color displayed from the first unit cell and the second unit cell with reference to the obtained input signal And a signal is generated. 16. The method of claim 15,
The at least one sensing unit may include at least one sensor selected from the group consisting of a gyro sensor, a temperature sensor, a humidity sensor, a pressure sensor, an acoustic sensor, an optical sensor, a current sensor, a voltage sensor, a charge sensor, an acidity sensor, And a timer. Applying an electric field to a second unit cell comprising a first unit cell comprising a first fluid in which first particles having a charge are dispersed and a second fluid in which a second particle having a charge is dispersed,
Controlling the color displayed from the first unit cell and the second unit cell by adjusting the intensity of the applied electric field
, &Lt; / RTI &
Wherein the first particle and the second particle move when an electric field having an intensity lower than a threshold value is applied,
Wherein the threshold value of the first particle and the threshold value of the second particle are set differently from each other. Applying an electric field to a second unit cell comprising a first unit cell comprising a first fluid in which first particles having a charge are dispersed and a second fluid in which a second particle having a charge is dispersed,
Controlling the color displayed from the first unit cell and the second unit cell by adjusting the application time of the applied electric field
, &Lt; / RTI &
Wherein the first particle and the second particle move when an electric field is applied for a time less than the respective response time and move when an electric field is applied for a time longer than the respective response time without moving,
Wherein the response time of the first particle and the response time of the second particle are set differently from each other. Applying an electric field to a second unit cell comprising a first unit cell comprising a first fluid in which first particles having a charge are dispersed and a second fluid in which a second particle having a charge is dispersed,
Controlling the color displayed from the first unit cell and the second unit cell by adjusting at least one of the intensity and the application time of the applied electric field
, &Lt; / RTI &
Wherein the first particle and the second particle do not move when an electric field of less than a respective threshold is applied or an electric field is applied for less than a respective response time, If it is applied for more than the response time,
Wherein a threshold value of the first particle and a threshold value of the second particle are set to be different from each other and a response time of the first particle and a response time of the second particle are set to be different from each other. / RTI &gt;

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