KR20060104485A - Electronic paper display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic paper display panel that can increase brightness by forming an opening in a color filter in an electronic paper display panel expressing color using a color filter. An opening and a lower electrode and a partition wall sequentially formed on the lower substrate; An upper electrode formed on the upper substrate; Black and white charged particles injected into the cell region formed by the partition wall; By configuring a color filter having an opening formed on the display surface of the cell region, the brightness of the display panel can be increased.

Description

Electronic paper display panel {ELECTRONIC PAPER DISPLAY PANEL}

1 is a cross-sectional view of an embodiment of a conventional collision charging type electronic paper display panel.

2A to 2F are cross-sectional views showing a manufacturing process of the electronic paper display panel shown in FIG.

3 is a cross-sectional view (a) and a plan view (b) of an embodiment of an electronic paper display panel using a conventional color filter.

4 is an exemplary diagram for describing an operation of a conventional color filter.

FIG. 5 is a sectional view of an embodiment of an electronic paper display panel according to the present invention and a plan view of a color filter thereof; FIG.

Figure 6 is an exemplary view for explaining the operation of the color filter according to the present invention.

7 is a plan view of a color filter with an opening of another form according to the invention;

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

10: lower substrate 20: lower electrode

30, 80: insulation layer 40: partition wall

50: charged particles 60: upper substrate

70: upper electrode 100: color filter with opening

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic paper display panel, and more particularly, to an electronic paper display panel capable of increasing luminance by forming an opening in a color filter in an electronic paper display panel expressing color using a color filter.

With the necessity of various display devices, electronic paper (E-paper) technology has been developed that can provide a clear picture quality for a long time with smaller driving power.

Electronic paper technology uses the rapid movement of microparticles by an electric field to electrostatically move charged particles floating in a certain space to display color. Even if removed, the image does not disappear because there is no change in the position of the particles, so that the effect is printed on paper. In other words, it does not emit light by itself, but the visual fatigue is very low, so it is possible to enjoy comfortable viewing like a real book, and the panel's flexibility is high enough to bend and the thickness can be formed very thin. Expecting. In addition, as mentioned above, since the displayed image is maintained for a long time unless the panel is reset, the power consumption is extremely low, and thus it is useful as a portable display device. In particular, low prices due to simple processes and low-cost materials are expected to contribute to the popularization of electronic paper display panels.

1 is a cross-sectional view of a conventional collision charging type electronic paper display panel, and upper and lower substrates 10 and 60 having transparent electrodes (ITOs) 20 and 70 coated with insulating layers 30 and 80 are formed. The partition wall 40 is formed therebetween, and the charged particles charged and the charged particles 50 are positively charged in the space secured by the partition wall 40.

The thickness of the lower substrate 10 and the upper substrate 60 is not limited, but since the charged particles 50 must be moved by the electrostatic force, the thickness of the actual partition wall 40 (tens of tens to hundreds [μm]) or the charged particles ( Note that the size of 50) is very small. In addition, the thicknesses of the upper and lower electrodes 20 and 70 that are transparent compared to the thicknesses of the upper and lower substrates 10 and 60 are much thinner than those represented, and the thicknesses of the electrodes 20 and 70 and the charged particles 50 are increased. Note that the thickness of the insulating layer 30 coated on the electrodes 20 and 70 is also thin so as to prevent electron movement by contact.

Referring to the principle of operation of the electronic paper display device having the above structure, it is assumed that the black charged particles are positively charged and the white charged particles are positively charged (which may be oppositely charged).

First, when a negative voltage is applied to the upper electrode 70 and a positive voltage is applied to the lower electrode 20, the white particles charged by the coulomb force move toward the upper substrate 60. The black particles move toward the lower substrate 10. Since the white charged particles are located on the upper substrate 60 side, the white charged particles appear white when viewed from the outside. On the contrary, when a positive voltage is applied to the upper electrode 70 and a negative voltage is applied to the lower electrode 20, the charged black particles move toward the upper substrate 60, and the positively charged white particles It moves toward the lower substrate 10 and is displayed in black. Therefore, after applying a voltage so that all the cells appear white at first, only the desired cell is applied with the opposite voltage so that the cells appear black.

FIG. 2 is a cross-sectional view illustrating a process of manufacturing a conventional collision charging type electronic paper display panel shown in FIG. 1.

First, as shown in FIG. 2A, a transparent lower electrode 20 and an insulating layer 30 are sequentially formed on the lower substrate 10. Since the basic electrode structure of the electronic paper display panel is a matrix structure, the lower electrode 20 has the same shape as the perspective view shown on the right side. Preferably, the transparent electrode is ITO, and there is no problem in driving even if the insulating layer 30 applied thereon is omitted. However, when the charged particles are in close contact with the electrode, electron movement occurs, thereby reducing the memory effect. It is preferable to apply the image since it may be difficult to preserve the image for a long time without powering on.

As shown in FIG. 2B, a partition wall 40 is formed on the substrate. Since the barrier 40 is simply used to distinguish cell units, the material may be a polymer, an inorganic material, or the like. In general, a method for configuring the barrier 40 includes photolithography using photoresist. A method, a method using a photosensitive polymer, a laminating method using a cut of a pre-made material, and the like may be used, and in the case of adhesion, it may be applied on a preformed lower plate by a method such as UV adhesive and UV irradiation. The general partition 40 has a lattice structure as shown in the right perspective view.

As shown in FIG. 2C, negatively charged charged particles 50 using a corona discharge lamp are injected into a nozzle and injected into a space (cell) divided by the partition wall 40. At this time, by applying a positive voltage to the lower electrode 20 or a means for applying a positive electric field to the lower portion of the substrate 10 so that the charged particles 50 are easily reached inside the partition 40. . The charged particles 50 have an additive material for controlling the charging characteristics internally, and when the charged particles 50 collide with each other, the charging characteristics appear. When you apply AC, you will be able to find your match characteristics.

As shown in FIG. 2D, the charged particles 50a disposed on the partition wall 40 are removed in various ways. The most common method is to adsorb and remove the charged particles (50a) in the upper portion of the partition 40 with a roller coated with an adhesive, and after completing the charge injection in a state in which a separate mask is disposed on the partition 40 The method of removing the mask can also be used.

As shown in FIG. 2E, the transparent upper electrode 70 and the upper insulating layer 80 are sequentially formed on the transparent upper substrate 60 in the same process as the lower plate for use as the upper plate. In this case, the upper electrode 70 may also have a structure as shown in FIG. 2A, but has a direction perpendicular to the lower electrode.

As shown in FIG. 2F, the formed upper plate structures 60, 70, and 80 are disposed on the lower plate structures 10, 20, 30, and the partition 40, and joined to each other. Then, if necessary, by repeatedly applying the opposite voltage to each electrode by moving the charged particles 50 to collide with each other to be negatively or positively charged, respectively.

3 is a cross-sectional view (a) and a plan view (b) of a conventional electronic paper display panel using a color filter to express colors, and the color is displayed on the electronic paper display panel in which the black-and-white charged particles 50 are injected. To express, R, G, and B color filters 90 are formed on the display surface of each cell region. In this case, it can be seen that the R, G, and B color filters formed on the display surface of the cell region are completely covered as shown in the plan view.

However, in the conventional electronic paper display panel, since the color filter is formed in the entire area of the cell, as shown in FIG. 4, the external light is transmitted through the color filter 90 and the light is reflected by the particles, and again the color filter ( 90). Therefore, since the light passes through the color filter twice, the reflected light decreases a lot, and thus, the white light having high luminance cannot be expressed, resulting in a low black-and-white contrast ratio.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and is formed on the display surface of the cell region and forms an opening in the color filter for expressing color, thereby improving the brightness of the display panel. The purpose is to provide a paper display panel.

The present invention for achieving the above object is characterized in that the opening is formed in the color filter formed on the display surface of the cell area.

In addition, the opening is in the form of a circle or a square, arranged at regular intervals, the size is characterized in that the number [μm].

The present invention for achieving the above object and the lower electrode and the partition formed sequentially on the upper substrate; An upper electrode formed on the upper substrate; Black and white charged particles injected into the cell region formed by the partition wall; And a color filter having an opening formed on the display surface of the cell region.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described.

First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as much as possible even if displayed on different drawings.

In addition, detailed description of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

In general, an electronic paper display panel expresses color by forming a color filter on a display surface above a cell region in a panel in which black charged particles are injected or by injecting color charged particles into a cell region without using a color filter. SUMMARY OF THE INVENTION The present invention aims to increase the luminance of a display panel by forming an opening in the color filter in an electronic paper display panel expressing color using the color filter.

At this time, the opening ratio by the opening of the color filter is suitable to 50% [%] or less, and by arranging the opening of the circular or square shape having a number [μm] in the color filter formed in the cell region at regular intervals, %] Or less. That is, the ratio of the closed portion and the open portion (opening) of the color filter is formed to be 1: 1 or less.

5 is a cross-sectional view of an embodiment of an electronic paper display panel and a plan view of a color filter according to the present invention, and it can be seen that the structure of the color filter 100 having an opening formed on the display surface of the cell area is formed. .

That is, the lower electrode 20, the insulating layer 30, and the partition wall 40 are sequentially formed on the lower substrate 10, and the upper electrode 70 and the insulating layer 80 are disposed on the upper substrate 60. Charged and positively charged particles 50 are formed in the space (cell region) formed sequentially and formed by the partition 40 formed between the upper and lower substrates 10 and 60. The color filter 100 having an opening is formed on the display surface of the cell region formed by the partition 40.

In this case, the openings formed in the color filter 100 are in a circular shape, the size of the openings are several [mu m], and the openings in the circular shape are arranged at regular intervals such that the opening ratio is 50 [%] or less.

As shown in FIG. 6, in the color filter according to the present invention having the opening, 50 [%] of the external light passes through the color filter 100, and the remaining 50 [%] passes through the opening. 50 [%] of the reflected light reflected from the light passes through the color filter 100 and the remaining 50 [%] passes through the opening. Thus, 50 [%] of light passes through the color filter once, 25 [%] passes through the color filter twice, and 25 [%] does not pass through the color filter.

That is, in the case of the existing color filter without the opening, 100 [%] of the light passes through the color filter twice, whereas in the present invention, 50 [%] of the light passes through the color filter once and 25 [%] of the light passes. Since the color filter passes twice, the saturation is slightly lower than the conventional one, but the reflected light is increased to increase the most important luminance in the display panel.

7 is a plan view showing another form of the opening formed in the color filter according to the present invention, wherein the openings of the color filter 100 are regularly arranged in a rectangular form, and the opening ratio is about 25 [%]. have. That is, it can be seen that the size of the opening of the color filter and the space between the openings are the same. Of course, it is obvious that the opening ratio of the color filter can be adjusted by adjusting the opening size and the space between the openings.

Therefore, the openings of the color filter according to the present invention may be formed by arranging the color filter in a pattern capable of patterning, for example, a rectangle, an ellipse, and the like in a vertical shape. In addition, the aperture ratio of the color filter may be determined by the size of the openings and the arrangement interval, and it is preferable that the openings are formed at a constant ratio in the entire area of the color filter.

As described above in detail, the present invention is formed on the display surface of the cell region, and the opening of the color filter for expressing the color can increase the luminance of the display panel.

Claims (6)

An electronic paper display panel, characterized in that an opening is formed in the color filter formed on the display surface of the cell region. The electronic paper display panel of claim 1, wherein the openings have a circular shape and are arranged at regular intervals. The electronic paper display panel of claim 1, wherein the openings have a rectangular shape and are arranged at regular intervals. The electronic paper display panel according to claim 2 or 3, wherein the size of the opening is several [mu] m. The electronic paper display panel of claim 1, wherein an aperture ratio of the color filter is 50 percent [%] or less. A lower electrode and a partition wall sequentially formed on the lower substrate; An upper electrode formed on the upper substrate; Black and white charged particles injected into the cell region formed by the partition wall; The electronic paper display panel comprising a color filter having an opening formed on the display surface of the cell area.

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