KR20060082695A - Electronic paper display device using collision electrification and driving method thereof - Google Patents

Abstract

The present invention charges color charged particles for expressing color color in one cell and non-charged particles which are not influenced by driving voltage, and thus does not adjust the charging characteristics of the colored charged particles R, G, and B equally. The present invention relates to a collision charging type electronic paper display device capable of expressing color, wherein the cells formed between the partition wall and the partition wall are filled with color charged particles for expressing color and non-charged particles not affected by the driving voltage. In the method of driving a collision-charged electronic paper display device in which one kind of charged particles and one kind of non-charged particles are injected, a driving voltage is applied to one of two electrodes (upper electrode and lower electrode) to which a driving voltage is applied. When the ground voltage is applied to the other electrode, the color color is not realized even though the charging characteristics of the R, G, and B color charged particles charged in the cell are not equally adjusted. Not only can it be possible, but there is no limitation on the material used to adjust the charging characteristics of the colored charged particles, and this has the effect of easily adjusting the charging characteristics of the colored charged particles. In addition, since one of the two electrodes to which the driving voltage is applied is grounded and a negative driving voltage or a positive driving voltage is applied to the remaining electrodes, the color of the cell is displayed to reduce the components of the device for driving the display device. It is possible to reduce the manufacturing cost.

Description

Collision charging type electronic paper display device and driving method thereof {ELECTRONIC PAPER DISPLAY DEVICE USING COLLISION ELECTRIFICATION AND DRIVING METHOD THEREOF}

1 is a cross-sectional view showing a cell structure of a conventional collision charging type electronic paper display element.

FIG. 2 is an exemplary diagram of colors expressed in the cell shown in FIG. 1; FIG.

Fig. 3 is a cross-sectional view showing a cell structure of the present invention, the collision charging type electronic paper display element.

4A to 4B are cross-sectional views for explaining the color representation according to the present invention.

5 is a conventional drive waveform diagram (a) and a drive waveform diagram (b) of one embodiment of the present invention;

Figure 6 is a drive waveform diagram of yet another embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

1: lower substrate 2: lower electrode

3,9: insulating film 4: partition wall

5: Color positive (+) charged particle 7: Upper substrate

8: top electrode 10: non-charged particles

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision charging type electronic paper display device and a driving method thereof. In particular, the present invention relates to a color charged particle by charging color charged particles for expressing color color in one cell and non-charged particles not affected by driving voltage. The present invention relates to a collision charging type electronic paper display device and a driving method thereof capable of expressing color hues without adjusting the charging characteristics of R, G, and B).

Digital paper displays are being developed as next-generation display devices, followed by liquid crystal displays, plasma display panels, and organic luminescence devices. In particular, electronic paper is a flexible substrate such as a thin plastic with millions of beads scattered in an oil hole, and a display element that can display characters or images. It can be reproduced and used millions of times. It is expected to be a material to replace existing print media such as newspapers and magazines.

Electronic paper displays are the core of flexible (or paper) display implementations, and are based on electrophoresis, which applies electromagnetic fields to conductive materials to make them moveable. After the conductive fine particles are distributed, the data is represented by a change in the arrangement of the fine particles (or charged particles) due to the change in the polarity of the electromagnetic field.

1 is a cross-sectional view showing a cell structure of a conventional collision charging type electronic paper display element. As shown, the upper and lower substrates 7 and 1 formed of any one of plastic or glass, and the driving voltage of the device are applied on the upper and lower substrates 7 and 1, and the upper and lower substrates are formed of transparent electrodes. Between the electrodes 8 and 2, the partition wall 4 separating the cells from the cells and keeping the gap between the upper and lower substrates 7 and 1 constant, and between the two electrodes 8 and 2; The black negatively charged particles 6 formed therein and the color positive (+) charged particles 5 for expressing color, and formed on the upper electrode 8 and the lower electrode 2 to maintain a memory effect It consists of insulating films 3 and 9 for this purpose.

Here, the colored positively charged particles are red (R) positively charged particles 5a, blue (B) positively charged particles 5b, and green (G) positively charged particles (not shown) are black negatively charged particles. Each cell is charged with (6) and the cell expresses black or color (R, G, B) by the applied driving voltage.

In the collision charging type electronic paper display device having such a configuration, when sufficient driving voltage is applied to the upper electrode 8 and the lower electrode 2, the charged particles charged according to the voltage polarity applied to the electrodes 8 and 2 are each electrode. Is drawn to. For example, the black charged particles 6 have (-), the red (R) charged particles 5a, and the blue (B) charged particles 5b exhibit positive characteristics, and a positive voltage is applied to the upper electrode 8. When a negative voltage is applied to the lower electrode 2, the black charged particles 6 are moved to the upper electrode 8, and the colored (R, B) charged particles 5 are moved to the lower electrode 2 to form a cell. Will express black. On the contrary, when a negative voltage is applied to the upper electrode 8 and a positive voltage is applied to the lower electrode 2, the black charged particles 6 move to the lower electrode 2, and the colored charged particles 5 are moved upward. As shown in FIG. 2, the color of each cell, that is, the left cell is red (R) and the right cell is blue (B).                         

However, the conventional collision charging type electronic paper display element expresses color color by filling each cell with one kind of color (R, G, B) charged particles and charged particles forming a background such as black or white. There was a problem in that the charging characteristics for the colored charged particles were controlled to be the same. That is, since the charging characteristics for each of the colored charged particles are different from each other, even if the same driving voltage is applied, the number of each of the colored charged particles moved may be different, and thus, the characteristics of the color colors represented may be different.

Therefore, the conventional collision charging type electronic paper display device uses an external additive, a charge control agent (CCA), a resin, a dye, or the like in each of the colored charged particles charged in each cell to eliminate the above problems. The charging characteristics of the B color charged particles were adjusted (controlled).

However, such a prior art has a limited number of materials used to equally control the charging characteristics due to the black or white charged particles filled with the colored charged particles. That is, due to the charging characteristics of the black or white charged particles, there is a problem in that the material used for equalizing the charging characteristics of the colored charged particles is limited.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and is filled with the color charged particles for displaying color in the cell and the non-charged particles not affected by the driving voltage, the movement of the color charged particles By the color charged particles to express the color or the color of the non-charged particles, the collision charged electronic paper display device capable of realizing color color without adjusting the charging characteristics of the R, G, B color charged particles charged in the cell And a driving method thereof.

In addition, the present invention is not limited to the material used to adjust the charging characteristics of the colored charged particles charged together because the non-charged particles are charged in the cell, and thus the collision charging type that is easy to adjust the charging characteristics of the colored charged particles An object of the present invention is to provide an electronic paper display device and a driving method thereof.

In order to achieve the above object, the present invention provides a collision charging type electronic paper display device in which color charged particles for expressing color in a cell formed between the partition wall and the partition wall and non-charged particles are not affected by the driving voltage. It is done.

In order to achieve the above object, the present invention provides a method for driving a collision charged electronic paper display device in which a charged charged electronic paper display device in which one type of charged particles and one type of non-charged particles are injected into a cell is driven. The driving voltage is applied to one of the two electrodes (upper electrode and the lower electrode) to which the voltage is applied, and the ground voltage is applied to the other electrode.

With reference to the accompanying drawings, preferred embodiments of the present invention, the collision charging type electronic paper display device having the above characteristics and a driving method thereof will be described in detail.

3 is a cross-sectional view showing a cell structure of the present invention for a collision charging type electronic paper display device. As shown, the upper and lower substrates (7, 1) formed of any one of plastic or glass, and the driving voltage of the device is applied on the upper and lower substrates (7, 1), and the upper and Between the lower electrodes 8 and 2, the partition wall 4 for keeping the upper and lower substrates 7 and 1 constant, and separating the cell from the cell, and between the two electrodes 8 and 2; An insulating film formed on the red (5a) or blue (5b) colored charged particles 5 and non-charged particles 10 formed on the upper electrode 8 and the lower electrode 2 to maintain a memory effect It consists of (3, 9).

The colored charged particles 5 are positive (+) or negative (-) charged particles having R, G, and B colors. Since the particles charged together in the cell are non-charged particles 10, the existing black or white charged particles In addition to the limited materials (external additives, charge control agents, resins, etc.) used to adjust the charging characteristics of the colored charged particles during particle charging, various materials may be used, and the materials used for the colored charged particles of the present invention may be prepared. It can be decided by the vendor.

The non-charged particles 10 are formed of a polymer, an inorganic material, or the like, and even if a driving voltage is applied to the upper electrode 8 and the lower electrode 2, the non-charged particles 10 are not affected by the applied driving voltage. Use small particles. That is, the color of the color charged particles 5 is displayed or the color of the non-charged particles 10 is displayed by the movement of the color charged particles 5 filled in the cell.

Then, the operation of the present invention will be described with reference to FIG.

First, FIG. 4A shows the colored charged particles 5 and the non-charged particles charged in the cell when a negative voltage is applied to the upper electrode 8 of the cell and a positive voltage is applied to the lower electrode 2. As shown in FIG. 10, as shown, since the upper electrode 8 is subjected to a negative voltage, the colored (R, G, B) (+) charged particles 5 charged in the respective cells are on the upper side. As shown in FIG. 2, each cell moves to the electrode 8 to represent the color color of the colored charged particles 5 filled with red (R) and the right cell with blue (B). In addition, the non-charged particles 10 are moved toward the lower electrode 2 by being pushed by the colored charged particles 5 because the colored charged particles 5 move toward the upper electrode 8.

On the other hand, FIG. 4B shows the colored charged particles 5 and the non-charged particles charged in the cell when a positive voltage is applied to the upper electrode 8 of the cell and a negative voltage is applied to the lower electrode 2. As shown in FIG. 10, as shown, since the lower electrode 2 is charged with a negative voltage, the color (R, G, B) (+) charged particles 5 charged in each cell are lowered. Movement to the electrode 2 causes the non-charged particles 10 to move toward the upper electrode 8 so that each cell represents the color (black or white) of the non-charged particles 10.

As described above, since the present invention is filled with colored charged particles and non-charged particles which are not affected by the driving voltage, the material used to control the charging characteristics of the colored charged particles charged in each cell can be variously used. There is this. In other words, it is possible to eliminate the inconvenience of adjusting the charging characteristics by the limited material.

In addition, since only the colored charged particles exhibit charging characteristics, there is an advantage in that colors can be realized even without adjusting the charging characteristics in the same manner.

FIG. 5 shows a driving waveform diagram (b) and a conventional driving waveform diagram (a) of an embodiment for driving the collision charging type electronic paper display element of the present invention. As shown, the conventional driving waveform (a) is a scan electrode to which a driving voltage is applied to display the color of a cell because two charged particles having different charging polarities are used in a cell of a conventional collision charging type electronic paper display device. Although voltages (waveforms) having different polarities were applied to both the (upper electrode) and the data electrode (lower electrode), the driving waveform (b) of the present invention is a kind of charged particles having polarity and non-polarity in the display cell. Since the whole particles are used, it can be seen that a positive driving voltage V _D (or a negative driving voltage) is applied to only one of the scan electrodes and the data electrodes to display the color of the cell.

That is, the present invention applies the driving voltage to only one of the scan electrode and the data electrode to display the color of the color charged particles or the color of the non-charged particles injected into the cell. For example, as shown in Fig. 5B, when a positive driving voltage V _D is applied only to the scan electrode (upper electrode), the positive color charged particles charged in the cell move toward the data electrode, and the positive color charge The particles cause the non-charged particles to move toward the scan electrode. Thus, the cell displays the color of the non-charged particles (black or white). On the other hand, if no voltage is applied to the scan electrode, i.e., 0 [V], and a positive driving voltage V _D is applied only to the data electrode, the positive color charged particles move toward the scan electrode and the cell has a positive color. The color of the charged particles is displayed. Through the above process, the color of the collision charging type electronic paper display device of the present invention is displayed. The color of the cell may be displayed by applying a negative driving voltage instead of a positive driving voltage to the scan electrode or the data electrode.

FIG. 6 illustrates a driving waveform of another embodiment of the present invention, in which the data electrode is grounded (0 [V]) and a positive driving voltage (V _D ) or a negative driving voltage (-V) is applied to the scan electrode. _D ) is applied to display the color of the colored charged particles or non-charged particles injected into the cell. Thus, the color displayed in the cell is determined by the polarity of the driving voltage applied to the scan electrode. That is, when a positive driving voltage V _D is applied to the scan electrode, the positive color charged particles move to the data electrode, the non-charged particles move toward the scan electrode, and the cell displays the color of the non-charged particles and vice versa. When a negative driving voltage (-V _D ) is applied to the electrode, the positive color charged particles move toward the scan electrode, and the non-charged particles move toward the data electrode, so that the cell displays a positive color charged particle color. In addition, the electrode to which the driving voltage is applied may be changed. That is, the scan electrode is grounded and the color of the cell can be displayed by applying a positive driving voltage or a negative driving voltage to the data electrode. As described above, the driving method shown in FIG. 6 grounds one of the data electrodes and the scan electrodes, and displays the color of the cell by applying a positive driving voltage or a negative driving voltage to the other electrodes. The device is reduced and simplified compared to the existing. That is, since the constituent devices previously required for both electrodes need only be configured on only one electrode, the constituent devices for driving the display elements can be simplified, and the manufacturing cost can be reduced.

As described in detail above, the present invention is filled with the color charged particles for displaying color in the cell and the non-charged particles are not affected by the driving voltage, and the color charged particles are colored or non-charged by the movement of the color charged particles By expressing the color of the particles, even if the charging characteristics of the R, G, B color charged particles charged in the cell are not adjusted equally, color color can be realized.

In addition, the present invention is not limited to the material used to adjust the charging characteristics of the colored charged particles charged together because the non-charged particles are filled in the cell, thereby having the effect of easily adjusting the charging characteristics of the colored charged particles. .

In addition, according to the present invention, since one of two electrodes to which a driving voltage is applied is grounded and a negative driving voltage or a positive driving voltage is applied to the other electrode to display the color of the cell, the device for driving the display element is constructed. The element can be reduced, and the manufacturing cost can be lowered.

Claims (7)

A collision charged electronic paper display device, characterized in that charged cells for expressing color and non-charged particles which are not affected by a driving voltage are charged in cells formed between the partition walls and the partition walls. The collision charging type electronic paper display device according to claim 1, wherein the size of the non-charged particles is smaller than that of the colored charged particles. The collision charging type electronic paper display device according to claim 1, wherein the non-charged particles are formed of a polymer or an inorganic material. In the collision charging type electronic paper display device driving method in which one type of charged particles and one type of non-charged particles are injected into a cell, A driving voltage is applied to one of two electrodes (upper electrode and lower electrode) to which a driving voltage is applied, and a ground voltage is applied to the other electrode. The collision charging type according to claim 4, wherein a ground voltage is applied to the other electrode when the driving voltage is applied to the one electrode, and a driving voltage is applied to the other electrode when the ground voltage is applied to the one electrode. Electronic paper display device driving method. The method of claim 5, wherein a driving voltage having the same polarity is applied to the one electrode and the other electrode. The method of claim 4, wherein only a ground voltage is applied to one of the two electrodes, and a positive or negative driving voltage is applied to the other electrode.

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