KR101392583B1 - Reflective color display device - Google Patents

Abstract

The present invention relates to a reflective color display device. An embodiment of the reflective color display device comprises at least one pixel. The pixel includes: a first substrate; a first signal line which is located on the first substrate and is extended along a first direction; a second signal line which is extended along the first direction by being separated from the first signal line on the first substrate; a second substrate located on the opposite to the first substrate; a third signal line which is located on the second substrate, and is extended along a second direction crossing with the first direction; a first electrophoretic particle having a first color and a first conduction state; a second electrophoretic particle having a second color different from the first color and having a second conduction state different from the first conduction state; and a dielectric fluid which has a third color different from the first color and the second color, and is filled between the first substrate and the second substrate. Thus, each pixel can display desired three primary colors independently and also can perform gray scaling of each of the three primary colors without comprising a color filter. Therefore, it is possible to express a number of pixels in a single color at the same time, and the reflective color display device has more excellent color gamut than the conventional color implementation method.

Description

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

The present invention relates to a reflection type color display device.

Electrophoretic display (EPD) is being actively studied as a flat panel display device in addition to a liquid crystal display, an organic light emitting display, and the like.

Electrophoretic display devices, which are widely used in electronic paper and the like, are inexpensive to manufacture compared to other flat panel display devices, and power consumption is reduced because power consumption for maintaining illumination devices and images is almost unnecessary like a liquid crystal display device.

In addition, the electrophoretic display device has a wider viewing angle than other self-emission type flat panel display devices and has a memory effect that the display image does not disappear even when the power supply is interrupted.

The electrophoretic display device electrostatically moves charged particles suspended in a predetermined space by using movement of micro particles by an electric field to display a desired image. After the image is displayed, Even if the power supply is interrupted, the position of the particles does not change, so the display image is maintained.

Since the electrophoretic display device is a reflection type display device that reproduces colors by reflecting external light unlike a display device having self-luminescence or an internal light source device, the electrophoretic display device uses a color filter When the pixilation method is applied as it is, in an example of a color display device using a single color (pure color), for example, three primary colors, when only one third of all pixels are red And the remaining pixels, 2/3 pixels, are filled with black. Thus, there is a problem that a single color is limited in displaying a single color and the displayed image is dark in principle.

In order to solve such a problem, in the example of the implementation method in which pixels displaying white are added, the reflectance is improved but the color reproducibility is reduced and the chroma is lowered.

Korean Patent Application No. 10-2007-00039104 (Name: Addressing method of particle for color electronic paper implementation, filed April 23, 2007)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems.

Another technical problem to be solved by the present invention is to realize a cell structure for greatly improving existing color reproducibility.

According to an aspect of the present invention, there is provided a reflective color display device including at least one pixel, wherein the at least one pixel includes a first substrate, a first signal line positioned on the first substrate and extending in a first direction, A second signal line extending in the first direction on the first substrate and spaced apart from the first signal line, a second substrate located on the opposite side of the first substrate, a second substrate located on the second substrate, A first electrophoretic particle having a first color and a first electrophoretic state and a second electrophoretic particle having a second color different from the first color and having a second charged state different from the first charged state, A second electrophoretic particle, and a dielectric fluid having a third color different from the first and second colors and being filled between the first substrate and the second substrate.

The first color to the third color may be one of magenta, cyan, and yellow, respectively.

The first signal line and the second signal line may be made of a transparent conductive material or an opaque metal.

The third signal line may be made of a transparent conductive material.

The first and second substrates may be made of a transparent material, and the first and second substrates may be made of a flexible material.

The reflective color display device according to the above feature may further include a first driver for outputting a first driving signal to the first signal line, a second driver for outputting a second driving signal to the second signal line, And a third driver for outputting a third drive signal.

Each of the first to third driving signals may have at least one of a negative charging voltage, a positive charging voltage, and a floating state, and each of the first to third driving signals may receive a floating voltage or an intermediate voltage, Lt; / RTI >

Wherein each of the first signal line, the second signal line and the third signal line may have one of a positive charging state, a negative charging state and a floating state, and the first signal line, the second signal line and the third signal line May have the floating state by receiving a floating voltage or an intermediate voltage.

According to this aspect of the present invention, since the desired single color is displayed for each pixel without the color filter, the structure of the display device is simplified, and the manufacturing time and manufacturing cost are reduced.

In addition, by controlling the arrangement of the first and second electrophoretic particles according to the polarity states of the first to third signal lines, it is possible to realize a single color for each of the pixels, and to realize one of each of magenta, cyan, It is possible to realize pixels of various colors according to the gradation of each pixel to be displayed, and color reproducibility is improved.

1 is a block diagram of a reflective color display device according to an embodiment of the present invention.
2 is a partial cross-sectional view of a panel assembly of a reflective color display device according to an embodiment of the present invention, which is a cross-sectional view of a panel assembly illustrating a plurality of pixels positioned adjacent in a column direction.
3A to 3C are diagrams illustrating the principle of displaying a single color of magenta, cyan, and yellow on one pixel of a reflective color display device according to an embodiment of the present invention.
FIGS. 4A to 4C are views illustrating an example of controlling the polarities of the first to third electrodes so that the pixels displaying magenta in the reflective color display device according to the exemplary embodiment of the present invention display a yellow color.
FIGS. 5A to 5C are diagrams illustrating an example of controlling the polarities of the first to third electrodes so that a pixel that displays yellow in a reflective color display device according to an exemplary embodiment of the present invention displays cyan. FIG.
6A to 6C are views illustrating an example of controlling the polarities of the first to third electrodes so that the pixels displaying cyan are displayed in magenta in the reflective color display device according to an embodiment of the present invention.
7A to 7D are examples of operational waveforms of a reflective color display device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Hereinafter, a reflective color display device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1, a reflective color display device according to an exemplary embodiment of the present invention includes a display panel assembly 300, first through third driving units 10-A connected to the display panel assembly 300, 30).

The display panel assembly 300 includes a plurality of first and second signal lines L1-Ln, R1-Rn spaced apart from each other and extending in a first direction (row direction in FIG. 1) in the same direction and a plurality of first and second signal lines And a third signal line T1-Tm extending in a second direction (column direction in FIG. 1) intersecting the signal lines L1-Ln, R1-Rn.

2, the display panel assembly 300 includes a lower substrate (first substrate) 100 and an upper substrate (second substrate 200) facing each other and facing each other, And an electrophoretic layer (3) formed thereon.

In this example, the lower substrate 100 and the upper substrate 200 are respectively an insulating substrate made of a transparent material such as transparent glass or plastic or a transparent flexible material.

The electrophoretic layer 3 includes a plurality of first electrophoretic particles (or magenta electrophoretic particles) 31 having a first color (for example, magenta), a second color (for example, cyan a plurality of second electrophoretic particles (or cyan electrophoretic particles) 32 having a first color (cyan) and a third color (e.g., yellow) different from the first and second colors, (Or yellow dielectric fluid) 33 in which the two electrophoretic particles 31, 32 are floating.

For example, the first color is magenta, the second color is cyan, and the third color is yellow. However, the present invention is not limited to this, and the first to third colors may be cyan, magenta, Lt; / RTI >

At this time, since the first and second electrophoretic particles 31 and 32 are charged with opposite charges and have opposite charging states, the first and second electrophoretic particles 31 and 32 have opposite polarities I have. In the present embodiment, the first electrophoretic particle 31 is charged with a negative charge (first charge state) and the second electrophoretic particle 32 is charged with a positive charge (+) 2 charge state), but is not limited thereto.

1, one first signal line L 1 -Ln and one second signal line R 1 -Rn are alternately spaced apart from each other to form one first signal line L 1 -Ln and one first signal line L 1 -Ln, The two signal lines R1-Rn are paired with each other and are located in the display panel assembly 300. [

At this time, a pair of first and second signal lines L1-Ln and R1-Rn, one third signal line T1-Tm crossing the pair of first and second signal lines, and an electrophoretic layer 3 ) Constitute one pixel (PX).

2, one pixel PX includes a first electrode 21 which is located on the lower substrate 100 and constitutes a first signal line L1-Ln, a first electrode 21 which is formed on the lower substrate 100, A second electrode 22 which is positioned to be spaced apart from the first and second electrodes 21 and 22 and forms a second signal line R1 to Rn and a third electrode 22 which faces the first and second electrodes 21 and 22 on the upper substrate 200, (23), and an electrophoretic layer (3) located between these electrodes (21-23).

The plurality of first and second electrodes 21 and 22 (or the plurality of first and second signal lines L 1 through Ln and R 1 through Rn) may be transparent (e.g., indium tin oxide (ITO) or indium zinc oxide And a plurality of third electrodes 23 (or a plurality of third signal lines T 1 to Tm) are made of a transparent conductive material.

Accordingly, the display panel assembly 300 is provided with a plurality of pixels PX arranged in a matrix form as shown in Fig.

As shown in FIG. 1, a plurality of pixels PX located in the same row are connected to the same second signal line (R 1 -Rn) as the first signal line (L 1 -Ln), and a plurality of pixels (PX) are connected to the same third signal line (T1-Tm).

2, the first and second signal lines L1-Ln and R1n-Rn are located on the lower substrate 100 and the plurality of third signal lines T1-Tm are positioned on the upper substrate 200, .

As shown in FIG. 2, the barrier ribs 900 are located between adjacent pixels PX, and have openings (not shown) for isolating the adjacent pixels PX and exposing the third electrodes 23. As shown in FIG. 2, in one pixel, the third electrode 23 is located on the entire surface of the upper substrate 200, which is located between adjacent barrier ribs 900 and is exposed by the opening.

Therefore, since the one pixel PX is surrounded by the partition 900, the dielectric fluid 33 injected into the different pixel PX is isolated without being mixed with each other.

The barrier rib 900 may include a resin such as polyacrylates or polyimides and an inorganic material such as silica.

The first driver 10 applies a plurality of first driving signals dl1-dln to the plurality of first signal lines L1-Ln (or the plurality of first electrodes 21) (Dr1-drn) to the plurality of second signal lines R1-Rn (or the plurality of second electrodes 21), and the third driver 30 applies a plurality of third signal lines T1 -Tm) (or the plurality of third electrodes 23) in response to the third driving signals dt1-dtm.

At this time, each of the first to third driving signals dl1-dln, dr1-drn, and dt1-dtm has a first color which is currently arranged when displaying a single color of magenta, cyan, And has a voltage value for changing the charged state of the first to third electrodes 21-23 to a desired final state according to the arrangement state of the electrophoretic particles 31 and the second electrophoretic particles 32. [

Therefore, each of the first to third driving signals dl1-dln, dr1-drn, and dt1-dtm has a voltage for changing the charging state of the first electrode 21-23 to a negative polarity (hereinafter, A negative charging voltage), a voltage for changing the positive polarity (positive charging voltage), and a floating state for a memory effect.

At this time, for the floating state for obtaining the memory effect, each of the first to third driving signals dl1-dln, dr1-drn, dt1-dtm is a floating voltage or negative charging voltage It is possible to apply a voltage having a value between the charging voltage (i.e., the intermediate voltage) to the corresponding one of the driving signal lines L1-Ln, R1-Rn, and T1-Tm. Thus, each of the first to third driving signals dl1-dln, dr1-drn, dt1-dtm has a floating voltage or a middle voltage for a floating state for a memory effect.

Each of the first to third electrodes 21 to 23 present in one pixel PX by the first to third driving signals dl1 to dln, dr1 to drn and dt1 to dtm is a negative State, a positive charging state, and a floating state.

Next, with reference to FIG. 3A to FIG. 3C, an operation principle of displaying a single color in each pixel PX of the reflective color display device according to the present embodiment will be described.

As described above, in this example, the magenta electrophoretic particles 31 are negative electrophoretic particles, the cyan electrophoretic particles 32 are positive electrophoretic particles, and each pixel PX is a Is filled with a yellow dielectric fluid (33). Therefore, when the charged state of the magenta electrophoretic particles 31 and the cyan electrophoretic particles 32 is opposite to that of the present example, the operation state is also reversed.

3A, in order for the pixel PX to display magenta, the magenta electrophoretic particles 31 are arranged on the upper substrate 200 adjacent to the outside and the cyan electrophoretic particles 31 are arranged on the lower substrate 100 side. (32) must be arranged.

The third electrode 23 in contact with the upper substrate 200 has a positive polarity and the first and second electrodes 21 and 22 in contact with the lower substrate 100 are negative- ).

Therefore, the cyan electrophoretic particle 32, which is positive electrophoretic particles, does not move away from the upper substrate 200 due to repulsive force with the second electrode 22, but has a polarity opposite to that of the cyan electrophoretic particle 32 The first and second electrodes 21 and 22 move toward the first and second electrodes 21 and 22 having negative polarity and move to the first and second electrodes 21 and 22, And are arranged adjacent to the first and second electrodes 21 and 22 above.

Similarly, the repulsive force of the third electrode 23 is opposite to that of the cyan electrophoretic particles 32 having the same polarity, and the repulsive force acts on the magenta electrophoretic particles 31 having the opposite polarity. Therefore, the third electrode 23 And the magenta electrophoretic particles 31 are arranged adjacently on the third electrode 23. In this case,

Because the magenta electrophoretic particles 31 having magenta are arranged on the upper substrate 200 side, the pixel PX displays magenta.

The yellow color of the dielectric fluid 33 existing between the lower substrate 100 and the upper substrate 200 is obscured by the color of the magenta electrophoretic particles 31 located on the upper substrate 200, It is not displayed outside.

Similarly, in order for one pixel PX to display cyan, cyan electrophoretic particles 32 are arranged adjacent to the third electrode 23, and adjacent to the first and second electrodes 21 and 22 The magenta electrophoretic particles 31 must be arranged.

Therefore, for this purpose, the first and second electrodes 21 and 22 have a positive polarity opposite to that of the magenta electrophoretic particles 31 and the third electrode 23 has a polarity opposite to that of the cyan electrophoretic particles 32 The magenta electrophoretic particles 31 are arranged adjacent to each other on the first and second electrodes 21 and 22 as shown in FIG. 3B, Cyan electrophoretic particles 32 are arranged adjacent to each other.

In order for one pixel PX to display the yellow color of the dielectric fluid 33, both the magenta electrophoretic particles 31 and the cyan electrophoretic particles 32 are spaced apart from the third electrode 23, And the second electrodes 21 and 22, respectively.

Therefore, one of the first electrode 21 and the second electrode 22 must have a polarity that attracts the magenta electrophoretic particles 31, and the other one of the first electrode 21 and the second electrode 22 Must have a polarity that attracts the cyanophore particles 32.

3C, the first electrode 21 and the second electrode 22 have polarities opposite to each other. When the third electrode 23 is kept in a floating state, the first and second electrodes 21, The magenta electrophoretic particles 31 and the cyan electrophoretic particles 32 are positioned adjacent to each other and the electrophoretic particles located at the third electrode 23 are not present in the first and second electrodes 21 and 22, respectively.

The dielectric fluid 33 existing between the upper substrate 200 and the lower substrate 100 does not exist because there is no magenta or cyan electrophoretic particles 31 and 32 adjacent to the upper substrate 200. Therefore, A yellow color, which is the color of the second electrode 23, is displayed to the outside through the third electrode 23 and the upper substrate 200 which are transparent.

 3C, the first electrode 21 has a positive polarity and the second electrode 22 has a negative polarity. On the contrary, the first electrode 21 has a positive polarity, The second electrode 22 may have a positive polarity and the second electrode 22 may have a positive electrode. In this case, the cyan electrophoretic particles 32 are positioned adjacent to the first electrode 21 and the magenta electrophoretic particles 31 are positioned adjacent to the second electrode 22. Particles and fluids in this state remain in their current state due to memory effects even when power is removed.

Next, referring to FIGS. 4A to 4C, 5A to 5C, and 6A to 6C, when the pixel PX is displaying any color, the color of the first to third electrodes 21 to 23 A driving method of changing the color of the pixel PX in a desired color by changing the polarity will be described as a few examples. The color display method for each pixel PX can be implemented in various ways other than the examples shown in Figs. 4A to 4C, 5A to 5C, and 6A to 6C.

First, referring to FIGS. 4A to 4C, in a state in which the pixel PX displays magenta, the voltages applied to the first to third electrodes 21 to 23 are used to drive the first to third electrodes 21 -23) is changed to display a yellow color.

When the pixel PX displays magenta, as shown in FIG. 4A, the first and second electrodes 21 and 22 maintain or maintain a negative polarity, The cyan electrophoretic particles 32 are arranged adjacently to the first and second electrodes 21 and 22 and the third electrode 23 maintains the positive polarity And the magenta electrophoretic particles 31 are arranged adjacent to the third electrode 23.

4B, the polarity of the first electrode 21 is changed to positive by using the first driving signal applied to the first electrode 21, and the polarity of the voltage applied to the third electrode 23 is changed The polarity of the third electrode 23 is changed to negative by using the third driving signal and the second driving signal applied to the second electrode 22 is maintained in the previous state to change the polarity of the polarity of the second electrode 22 Is maintained in a negative (-) state.

The magenta electrophoretic particles 31 arranged on the third electrode 23 move over the first electrode 21 due to the change in polarity of the first electrode 21 and the third electrode 22, The cyan electrophoretic particles 32 arranged on the first electrode 21 move toward the third electrode 23 and are arranged adjacent to the third electrode 23 on the contrary.

4C, since the positional movement of the electrophoretic particles 31 to the first electrode 21 has been completed, the first driving unit 10 applies the first driving signal to the first electrode 21, Thereby causing the first electrode 21 to be in the floating state (FS). As a result, the first electrode 21 exhibits a memory effect that maintains the current state regardless of the polarity change of the second and third electrodes 22 and 23.

However, in order to move the cyanophore electrophoretic particles 32 arranged on the third electrode 23 toward the second electrode 22, the polarity of the third drive signal applied to the third electrode 23 is positive (+ ), And the polarity state of the second electrode 22 maintains a negative (-) state.

A positive voltage may be applied to the first electrode 21 to more completely block the movement of the magenta electrophoretic particles 31 on the first electrode 21. [

4C, the cyan electrophoretic particles 32 located on the third electrode 23 are moved toward the second electrode 22, so that the cyan electrophoretic particles 32 adjacent to the second electrode 22, (32) are arranged.

4C, the magenta electrophoretic particles 31 and the cyan electrophoretic particles 32 are not present on the third electrode 23, so that yellow, which is the color of the dielectric fluid 33, Is displayed externally through the upper substrate (23) and the upper substrate (200). At this time, the magenta electrophoretic particles 31 and the cyan electrophoretic particles 32 located on the lower substrate 100 are maintained in the current state due to the memory effect with the first and second electrodes 21 and 22 even when the power source is removed .

Next, with reference to FIGS. 5A to 5C, an example of a process of displaying cyan by using the polarity change of the first to third electrodes 21 to 23 in a state in which the pixel PX displays yellow color will be described.

One example of the case where the pixel PX displays a yellow color is that one of the first and second electrodes 21 and 22 maintains a positive polarity and the first and second electrodes 21 and 22, (-) polarity is maintained in the other of the first and second electrodes 21 and 22. [ At this time, the third electrode 23 can maintain the floating state (FS), and the electrophoretic particles 31 and 32 located on the first and second electrodes 21 and 22 are fixed by the memory effect, It is possible to maintain a floating state that may be removed.

5A, the first electrode 21 maintains a positive polarity so that the magenta electrophoretic particles 31 are positioned adjacent to the first electrode 21 and the second electrode 21 is positioned adjacent to the negative (- ) And the cyanophore 32 is positioned adjacent to the second electrode 22.

In this state, as shown in FIG. 5B, the polarity of the first electrode 21 is controlled by controlling the first and third driving signals applied to the first electrode 21 and the third electrode 23, respectively, ), The polarity of the third electrode 23 is changed to positive (+), and the polarity of the second electrode 22 is maintained in the negative (-) state.

5B, the magenta electrophoretic particles 31 arranged on the first electrode 21 move toward the third electrode 23, and the magenta electrophoretic particles 31, which are adjacent to the third electrode 23, (31) are arranged.

5C, the polarities of the first and second electrodes 21 and 22 are changed to the positive (+) state and the polarity of the third electrode 23 is changed to the negative (-) state .

5C, the magenta electrophoretic particles 31 arranged on the third electrode 23 are arranged dispersed adjacent to the first and second electrodes 21 and 22, respectively, and the second The cyan electrophoretic particles 32 having positive polarity arranged on the electrode 23 move toward the third electrode 23 and are arranged adjacent to the third electrode 23. [

Therefore, since the magenta electrophoretic particles 31 are arranged adjacent to the first and second electrodes 21 and 22 and the cyan electrophoretic particles 32 are arranged adjacent to the third electrode 23, The pixel PX displays cyan.

6A to 6C, an example of a process in which a pixel PX displaying cyan represents magenta will be described.

An example of the case where the pixel PX displays cyan is that the magenta electrophoretic particles 31 are positioned adjacent to the first and second electrodes 21 and 22 and the third electrode 23) adjacent to the cyan electrophoretic particles 32 are located.

Therefore, the polarity of the first and second electrodes 21 and 22 is maintained in the positive (+) state, the polarity of the third electrode 23 is maintained in the negative (-) state, And the current state is maintained by the memory effect.

6B, the polarity of the first electrode 21 is controlled by controlling the first and third driving signals applied to the first electrode 21 and the third electrode 23, respectively, ), The polarity of the third electrode 23 is changed to positive (+), and the polarity of the second electrode 22 is maintained in the positive (+) state.

6B, the magenta electrophoretic particles 31 arranged on the first electrode 21 move toward the third electrode 23 and are arranged adjacent to the third electrode 23 The cyan electrophoretic particles 32 are arranged adjacent to the first electrode 21. At this time, since the second electrode 22 has no change in polarity, the magenta electrophoretic particles 31 are still located on the second electrode 22. In this case, a positive voltage may be applied to the second electrode 22 to block the movement of the cyanophore particles 32 on the first electrode 21.

Next, as shown in FIG. 6C, the state of the first electrode 21 is changed to the floating state FS, the polarity state of the second electrode 22 is changed to the negative state, The polarity of the second electrode 23 still maintains a positive polarity.

As a result, the magent electrophoretic particles 31 arranged on the second electrode 22 move toward the third electrode 23 and are arranged adjacent to the third electrode 23, as shown in FIG. 6C.

Thus, the cyan electrophoretic particles 32 are located on the first electrode 21, the magenta electrophoretic particles 31 are located on the third electrode 23, and no electrophoretic particles are present on the second electrode 22 In this case, magenta is displayed in the pixel PX.

As described above, since the first and second electrophoretic particles have magenta and cyan, respectively, and the dielectric fluid 33 is yellow, the first to third electrodes 21 to 23, It is possible to display the color of the pixel PX in a desired single color by changing the polarity of the first to third electrodes 21-23 by controlling the voltage state of the driving signal.

Thus, since the desired color is displayed without requiring a separate color filter for each pixel PX, the structure of the display panel assembly 300 is simplified, The cost is reduced.

In addition, since the three primary colors of the color PX for each of the pixels PX can be independently formed, the various colors can be realized by forming the three pixels PX in combination, and the pixelation color scheme (pixelation method, it is possible to make a single color image which was in principle impossible.

Next, an example of an operation of driving the reflective color display device according to an embodiment of the present invention will be described with reference to FIG.

In FIG. 7, reference numeral 'FS' denotes a floating state. As described above, the floating state FS effectively shields the electrophoretic particle from movement due to the memory effect. , A middle voltage between the voltage of the floating voltage or the negative voltage and the positive voltage can be applied to the corresponding electrode 21-22.

 In FIG. 7, when controlling the operation of the pixel PX located in the first row and the second row in the plurality of pixels PX arranged in the matrix structure in FIG. 1, the first to third electrodes 21-23 ) Of the first to third driving signals.

First, referring to FIGS. 7A and 7B, the operation of displaying the color of each pixel PX located in the first pixel row in a desired single color will be described.

As shown in FIG. 7A, the first and second driving units 10 and 20 first control the operation of the pixel PX located in the first column, The first and second driving signals dl1 and dr1 having voltages Vd1 and Vd2 corresponding to the second signal line R1 are applied.

The third driving unit 30 applies the third driving signal dt1 having the voltage Vd3 in the corresponding state to the first third signal line T1.

At this time, as described with reference to FIGS. 4A to 6D, the first to third driving signals dl1, dr1, and dt1 change the states of the voltages Vd1, Vd2, and Vd3 during the driving time t1, (I.e., the polarity state and the floating state) of the first, second, and third signal lines L1, R1, and T1.

As a result, the pixel PX located in the first column of the first row displays one of cyan, magenta, and yellow.

At this time, the states of the remaining first signal line L2-Ln and the remaining second signal line R2-Rn become the floating state FS as shown in FIG. 7A, Effect is exerted. Therefore, the remaining first signal line (L2-Ln) and the remaining second signal line (R2) are kept in a state of a voltage Vd2 applied to the third signal line (T1) commonly belonging to the pixel The display state of the pixel PX connected to the scan line -Rn remains in the previous state.

As described above, according to the voltages Vd1-Vd3 of the first through third driving signals dl1, dr1, dt1 applied to the first through third signal lines L1, R1, and T1, When the color display of the pixel PX is completed, the first third signal line T1 maintains the floating state FS so as not to be influenced by the pixels PX in the second column adjacent in the row direction.

Thereafter, the voltages Vd1 and Vd2 applied to the first and second signal lines L1 and R1 and the voltage Vd3 applied to the second third signal line T2 are controlled to be positioned in the second column The color of the pixel PX is controlled, and then the second third signal line T2 is controlled to the floating state (FS), so that the memory effect is exerted.

As shown in FIG. 7 (b), when the hue of each pixel PX sequentially positioned in the row direction is displayed, the third signal line T1 -Tm) are sequentially changed to the floating state so as not to be influenced by the display operation of the adjacent pixel PX.

As described above, when the operation of the pixel PX located on the first pixel line is controlled, the first and second signal lines L2-Ln and R2-Rn located on the remaining pixel lines are in the floating state FS .

When the display operation of all the pixels PX existing on the first pixel row is completed through this operation, as shown in (c) and (d) of FIG. 7, all the pixels PX Is controlled.

That is, as shown in FIGS. 7C and 7D, the first and second signal lines (L1, L3-Ln, R1, and R3) excluding the second first and second signal lines (L2 and R2) And the state of the first and second driving signals dl2 and dr2 applied to the floating gates -Rn are set as the floating state FS.

Therefore, for the operation of the second pixel row, the remaining first and second signal lines T 1 to Tm due to the state change of the third signal line T 1 to T m, which are located in the corresponding column and to which the voltage Vd 3 of the third driving signal dt 2 is applied, The display state of the pixel PX connected to the two signal lines L1, L3-Ln, R1, and R3-Rn is not changed.

Therefore, the voltages (Vd1, Vd2) of the first and second driving signals (dl2, dr2) applied to the second pixel row and having the corresponding states are applied for each pixel unit positioned in the row direction, And controls the voltage Vd3 of the third driving signal dt2.

When the driving of the pixel PX in each column is completed, the state of the third signal line T1-Tm is converted into the floating state FS as in the case of the first pixel row, as shown in FIG. 7 (d).

In this manner, the states of the first to third driving signals dl1-dln, dr1-drn, and dt1-dtm are changed during each fixed time t1-tm, The first and second electrophoretic particles 31 and 32 and the dielectric fluid 33 are changed to the final state by changing the states of the first to third signal lines L1 to Ln, R1 to Rn, So that each pixel PX displays a desired single color.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

10-30: driving part 21: first electrode
22: second electrode 23: third electrode
100: lower substrate 200: upper substrate
900: partition wall 31: first electrophoretic particle
32: second electrophoretic particle 33: dielectric fluid
L1-Ln: first signal line R1-Rn: second signal line
T1-Tm: third signal line dl1-dln: first driving signal
dr1-drn: second drive signal dt1-dtm: third drive signal
Vd1-Vd3: Voltage FS: Floating state

Claims (11)

The first substrate,
A first signal line located on the first substrate and extending in a first direction,
A second signal line extending in the first direction on the first substrate and spaced apart from the first signal line,
A second substrate positioned opposite the first substrate,
A third signal line located on the second substrate and extending in a second direction intersecting with the first direction,
A first electrophoretic particle having a first color and being in a first charged state, the first electrophoretic particle being one of magenta, cyan and yellow,
Second electrophoretic particles having a second color different from the first color and being one of magenta, cyan, and yellow and having a second charged state opposite to the first charged state,
And a dielectric fluid having a third color different from the first and second colors and being one of magenta, cyan, and yellow and being filled between the first and second substrates,
Lt; / RTI >
Wherein each of the first signal line, the second signal line and the third signal line has one of a positive charging state, a negative charging state and a floating state to display a color of one of the magenta, cyan, and yellow
Reflective color display. delete The method of claim 1,
Wherein the first signal line and the second signal line are made of a transparent conductive material or an opaque metal. The method of claim 1,
And the third signal line is made of a transparent conductive material. The method of claim 1,
Wherein the first and second substrates are made of a transparent material. The method of claim 5,
Wherein the first and second substrates are made of a flexible material. The method of claim 1,
A first driver for outputting a first driving signal to the first signal line,
A second driver for outputting a second driving signal to the second signal line,
A third driver for outputting a third driving signal to the second signal line,
And a reflective color display device. 8. The method of claim 7,
Wherein each of the first to third driving signals has one of a negative charging voltage, a positive charging voltage and a floating state. 9. The method of claim 8,
Wherein each of the first to third driving signals has a floating or intermediate voltage applied thereto. delete The method of claim 1,
Wherein each of the first signal line, the second signal line, and the third signal line has a floating or intermediate voltage applied thereto.

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