KR20060112379A - Ycm color filter and electronic paper display panel - Google Patents

Abstract

YCM(yellow,cyan,magenta) color filters and an electronic paper display panel are provided to increase brightness of white and increase black and white contrast ratio by expressing using a Y color filter transmitting red and green colors, a C color filter transmitting green and blue, and a M color filter transmitting blue and red, and forming the YCM color filters on a display surface where black and white charged particles are injected, or forming YCM sub-pixels by injecting YCM color charged particles in a cell region. A Y color filter transmits R(red) and G(green) to express Y(yellow). A C color filter transmits G(green) and B(blue) to express C(cyan). An M color filter transmits B(blue) and R(red) to express M(magenta). Y, C and M color filters are formed on a display surface of a cell region.

Description

YCM color filter and electronic paper display panel {YCM COLOR FILTER AND 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 of an embodiment of an electronic paper display panel to represent a conventional color.

4A to 4B are exemplary views of the present invention YCM color filter function and color relationship for expressing each color.

FIG. 5 is a cross-sectional view of an embodiment of an electronic paper display panel to which the YCM color filter of FIG. 4 is applied. FIG.

6 is a cross-sectional view of an embodiment of an electronic paper display panel in which YCM color charged particles are injected.

** 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: black and white charged particles 60: upper substrate

70: upper electrode 110: YCM color filter

120: YCM color and black charged particles

The present invention relates to a YCM color filter and an electronic paper display panel, and more particularly, to a YCM color filter and an electronic paper display panel that can increase luminance and contrast ratio by increasing reflectivity in an electronic paper display panel capable of expressing color. .

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 excellent 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 thickness of the transparent upper and lower electrodes 20 and 70 is much thinner than that of the upper and lower substrates 10 and 20, and the thickness of the electrodes 20 and 70 and the charged particles 50 may be reduced. 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 operation principle 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 negatively 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 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.

Here, if the electronic paper display device to be manufactured needs to inject R, G and B color charged particles into each cell in order to express color, the mask is first placed on top of the G and B cells and then R color charged to the R cell. The particles and the black or white charged particles are sprayed together to inject, and then the G and B color charged particles are injected in the G cell and B cell order or vice versa.

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. Here, although not shown, it is apparent that the adhesive is applied to the upper part of the partition wall and bonded to the upper plate structure.

Figure 3 shows an example of a cross-sectional view of an electronic paper display panel in order to express a conventional color, the case of using the R, G, B color filters (a) and the case of using the R, G, B color charged particles ( b) is a cross-sectional view. As shown in FIG. 3, R, G, and B color filters 90 are formed on each cell region of the electronic paper display panel into which the black and white charged particles 50 are injected, and the color is transmitted through the light transmitted through the color filters. Or R, G, B color charged particles 100 are injected into each cell region instead of the R, G, B color filters 90 to express color through the color charged particles.

However, since the color filters and the color charged particles used in the conventional electronic paper display panels are R, G, and B, the reflectivity on white is absorbed by two-thirds when compared to the white reflectivity of a black and white element, and eventually is reflected to our eyes. The amount of incoming light drops to one third. That is, when the reflectivity is dropped by the R, G, B color filter or the R, G, B color charged particles, it is impossible to express white with high luminance, resulting in a low black and white contrast ratio.

Therefore, the present invention has been created to solve the above-mentioned conventional problems, the Y (Yellow) color filter transmitting the R, G color, and the C (Cyan) color filter and B, R color transmitting the G, B color It is an object of the present invention to provide a YCM color filter capable of expressing color by using an M (Magenta) color filter passing through and increasing white luminance.

In addition, the present invention forms a YCM color filter on the display surface into which black and white charged particles are injected or by injecting YCM color charged particles into a cell region to form Y, C, and M subpixels, thereby increasing the reflectivity to increase white luminance. It is an object of the present invention to provide an electronic paper display panel that can increase and increase the contrast ratio.

The YCM filter of the present invention for achieving the above object is a Y color filter for transmitting the R (Red), G (Green) color to represent the Y (Yellow) color; A C color filter that transmits G (Green) and B (Blue) colors to express C (Cyan) colors; Characterized by consisting of an M color filter that transmits B (Blue), R (Red) color to represent the M (Magenta) color.

The electronic paper display panel of the present invention for achieving the above object is characterized in that Y (Yellow), C (Cyan), M (Magenta) color filters are formed on the display surface of the cell region.

According to an aspect of the present invention, there is provided an electronic paper display panel including: a lower electrode and a partition wall sequentially formed on an upper portion of a lower substrate; An upper electrode formed on the upper substrate; Black and white charged particles injected into a cell region (YCM subpixel) formed by the partition wall; And a YCM (Yellow, Cyan, Magenta) color filter formed on the display surface of the cell region.

The electronic paper display panel of the present invention for achieving the above object is characterized in that Y (Yellow) or C (Cyan) or M (Magenta) color charged particles are respectively injected into the cell region separated by the partition wall.

According to an aspect of the present invention, there is provided an electronic paper display panel including: a lower electrode and a partition wall sequentially formed on an upper portion of a lower substrate; An upper electrode formed on the upper substrate; And Y (Yellow) or C (Cyan) or M (Magenta) colored charged particles and black charged particles injected into the cell region (YCM subpixel) formed by the barrier rib.

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.

SUMMARY OF THE INVENTION The present invention uses the YCM (Yellow, Cyan, Magenta) color filter or YCM color charged particles to express the color of an electronic paper display panel and to increase the white luminance to increase the black and white contrast ratio.

At this time, the Y color filter transmits the R (Red), G (Green) color to express the Y color, the C color filter transmits the G (Green), B (Blue) color to express the C color, M color The filter transmits B (Blue) and R (Red) colors to express M colors. That is, since the amount of light transmitted through each color filter doubles compared to the existing R, G, and B color filters, the white luminance increases by that amount, and thus the black-and-white contrast ratio increases.

Figure 4 shows an example of the color filter function and the color relationship for expressing each color according to the present invention, it can be seen that the amount of transmitted light is double compared to the conventional R, G, B filters.

That is, as shown in FIG. 4A, the conventional R, G, and B color filters 110 transmit only one color of the R, G, and B colors, whereas the Y, C, and M color filters according to the present invention are R, G, and B color filters. Since two of G and B colors are transmitted, the amount of light transmitted is doubled compared to existing R, G, and B color filters. Therefore, the brightness of white when expressed in white with Y, C, and M color filters Is doubling compared to the luminance of white represented by the existing R, G, B color filters.

Here, the Y color filter transmits the R and G colors among the R, G, and B colors, the C color filter transmits the G and B colors of the R, G, and B colors, and the M color filter transmits the R, G, and B colors. Transmitting the R, B colors in the middle to express the Y, C, M colors, respectively, such Y, C, M color filter is due to the complementary color between the R, G, B colors and Y, C, M colors shown in Figure 4b It is done by principle. That is, the white color may be expressed by mixing R, G, and B colors, and the R, G, B color filters may be Y, C, M color filters by using the principle of expressing white color by mixing Y, C, and M colors. It can be replaced with, and when using the Y, C, M color filters, there is an advantage that can increase the brightness compared to the existing R, G, B color filters.

An example of expressing a color using the Y, C, and M color filters according to this principle will be described in the electronic paper display panel to which the YCM color filter will be described later.

FIG. 5 is a cross-sectional view of an electronic paper display panel to which a YCM color filter according to the present invention is applied, showing that the YCM color filter 110 is formed on the display surface of a cell region into which black and white charged particles are injected. Can be.

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. The black and white charged particles 50 which are sequentially formed and charged or charged in the space (cell region) secured by the partition 40 formed between the upper and lower substrates 10 and 60 are present, and the partition wall ( The YCM color filter 110 is formed on the display surface of the cell region (YCM subpixel region) formed by 40.

Table 1 shows the colors represented in the cells by the operation of the Y, C, M sub-pixels forming one cell in the electronic paper display panel shown in FIG.

As shown in Table 1, the color displayed in the cell consisting of the YCM subpixels is the color of white, black, R, G, B, Y, C, M by the operation of the subpixel in which the YCM color filter 110 is formed. It can be expressed, and it is obvious that more colors can be expressed when gradation expression is possible.

Referring to Table 1, in order to express white (W) in a cell, Y, C, and M colors must be expressed in Y, C, and M subpixels. That is, when the white charged particles injected in the Y, C, and M subpixel regions are driven to move to the display surface (upper), the cells are expressed in white, whereas the black charged particles injected in the Y, C, and M subpixel regions are When driven to move to the display surface (upper), the cell expresses black.

In addition, when the cell is driven so that the white charged particles injected into the Y subpixel and the M subpixel and the black charged particles injected into the C subpixel are moved to the display surface, the cell expresses the R color. G, B, Y, C, and M colors may be expressed using the black and white charged particles 50 injected into the C, M subpixels. Of course, the color represented by the present invention is apparent that the brightness is increased compared to the color represented by the existing R, G, B color filters.

6 is a cross-sectional view of another embodiment of an electronic paper display panel according to the present invention, in which Y, C, and M color charged particles 120 for expressing color are separated by partition walls 40, respectively. It can be seen that it is injected into the subpixel area.

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. Y, C, M color charged particles and black charged particles 120 are formed in the space (YCM subpixel region) formed by the partition 40 formed between the upper and lower substrates 10 and 60 in order. do.

The present invention having such a configuration expresses colors in the same manner as shown in Table 1, but does not use only Y, C, M color filters, but expresses colors directly using Y, C, M charged particles. There is a difference.

For example, in order to express white in a cell, when the Y, C, and M color charged particles injected into the Y, C, and M subpixels are driven to move to the upper portion of the display surface, the white is expressed in the cell. That is, Y, C, M color charged particles are moved instead of the white charged particles shown in FIG. 5 to express colors.

As described above, the present invention can express colors in the electronic paper display panel using the YCM color filter or the YCM color charged particles, and when the YCM color filter is used, the white luminance can be increased as compared with the conventional RGB color filter. There is an advantage to increase the contrast ratio.

As described in detail above, the present invention provides a Y (Yellow) color filter that transmits R and G colors, a C (Cyan) color filter that transmits G and B colors, and an M (Magenta) color filter that transmits B and R colors. The color can be expressed by using and the reflectance is increased by forming the YCM color filter on the display surface into which the black and white charged particles are injected or by injecting the YCM color charged particles into the cell region to form the Y, C, and M subpixels. By increasing the brightness of white, there is an effect that can increase the contrast ratio.

Claims (8)

A Y color filter that transmits R (Red) and G (Green) colors to express Y (Yellow) colors; A C color filter that transmits G (Green) and B (Blue) colors to express C (Cyan) colors; A YCM color filter comprising a M color filter that transmits B (Blue) and R (Red) colors to express M (Magenta) color. An electronic paper display panel, wherein Y (Yellow), C (Cyan), and M (Magenta) color filters are formed on the display surface of the cell region. 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 a cell region (YCM subpixel) formed by the partition wall; And a YCM (Yellow, Cyan, Magenta) color filter formed on the display surface of the cell area. The method of claim 3, wherein the white (G) green color is expressed when the white charged particles injected into the Y subpixels and the C subpixels and the black charged particles injected into the M subpixels move to an upper portion (upper electrode) of the display surface. An electronic paper display panel characterized by the above-mentioned. The method of claim 3, wherein the white (B) color is expressed when the white charged particles injected into the C subpixels and the M subpixels and the black charged particles injected into the Y subpixels move to an upper portion of the display surface (upper electrode). An electronic paper display panel characterized by the above-mentioned. The method of claim 3, wherein the white (R) red color is expressed when the white charged particles injected into the Y subpixels and the M subpixels and the black charged particles injected into the C subpixels move to an upper portion (upper electrode) of the display surface. An electronic paper display panel characterized by the above-mentioned. An electronic paper display panel, wherein Y (Yellow), C (Cyan), or M (Magenta) color charged particles are injected into a cell region separated by a partition. A lower electrode and a partition wall sequentially formed on the lower substrate; An upper electrode formed on the upper substrate; An electronic paper display panel comprising Y (Yellow) or C (Cyan) or M (Magenta) color charged particles and black charged particles injected into a cell region (YCM subpixel) formed by the barrier rib.

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