TWI489136B - Pixel structure - Google Patents

Description

Pixel structure

The present invention relates to a pixel structure, and more particularly to a pixel structure for displaying a color picture.

In the current electrowetting display device, a dye or a pigment is often added to a non-polar liquid layer to form a color medium. However, there are not many dyes which are non-polar soluble in the market at present, and in order to make the color medium have a good absorption coefficient, the dye structure must contain a specific functional group, and the solubility of the dye in the non-polar liquid may also be lowered. Affect the performance of component colors.

In other words, the current color saturation of the electrowetting display device is not good. However, if it is chosen to increase the length of travel of the light in the color solution to improve color performance, it is necessary to increase the thickness of the non-polar liquid layer in the display device, which may affect the driving performance of the display device. Therefore, there are still many improvements in the development of color electrowetting display technology.

The invention provides a pixel structure, which can effectively improve electrowetting display technology The problem of poor color.

The pixel structure of the present invention has a plurality of sub-pixel regions. The pixel structure includes a first substrate, a second substrate, a plurality of first partition walls, a plurality of second partition walls, a plurality of first pixel electrodes, a plurality of second pixel electrodes, a color display medium, and a The black display medium, a light transmissive display medium, and a color filter layer. The second substrate and the first substrate are spaced apart from each other. The first partition wall is disposed on the first substrate and the first partition wall is located at a boundary of the sub-pixel area. The second partition wall is disposed on the second substrate, and the second partition wall is located at the boundary of the sub-pixel area. The first pixel electrodes are disposed on the first substrate and are respectively located in the sub-pixel regions. The second pixel electrodes are disposed on the second substrate and are respectively located in the sub-pixel regions. The color display medium is disposed on the first substrate, and the color display medium comprises a first color drop, a second color drop, and a third color drop. The first color drop, the second color drop, and the third color drop are separated by a first partition wall to be respectively disposed in different sub-pixel regions. The black display medium is disposed on the second substrate and located between the second partition walls. The light transmissive display medium is disposed between the color display medium and the black display medium. The color filter layer is disposed on one of the first substrate and the second substrate, and the color filter layer includes a first color pattern. The first color pattern is located in the same sub-pixel area as the first color drop and the first color pattern has the same color as the first color drop.

In an embodiment of the invention, the first color pattern is different from the color density of the first color drop.

In an embodiment of the invention, the colors of the first color drop, the second color drop, and the third color drop are red, blue, and green, respectively.

In an embodiment of the invention, the color of the first color drop is green.

In an embodiment of the invention, the color filter layer further includes a second color pattern. The second color pattern is located in the same sub-pixel area as the second color drop and the second color pattern has the same color as the second color drop.

In an embodiment of the invention, the color filter layer further includes a third color pattern. The third color pattern is located in the same sub-pixel area as the third color drop and the third color pattern has the same color as the third color drop.

In an embodiment of the invention, each of the sub-pixel regions further includes an electrodeless portion, the electrodeless portion is located between each of the first pixel electrodes and one of the first partition walls, and is located at each of the second pixel electrodes One of the second partition walls.

In an embodiment of the invention, the black display medium and the color display medium are composed of a non-polar substance, and the light-transmitting display medium and the partition wall are composed of a polar substance.

In an embodiment of the invention, the pixel structure further includes a plurality of first active components and a plurality of second active components. The first active component drives the first pixel electrode, and the second active component drives the second pixel electrode, respectively. When the color filter layer is disposed on the first substrate, the color filter layer is integrated with the first active component. In addition, when the color filter layer is disposed on the second substrate, the color filter layer is integrated with the second active device.

In an embodiment of the invention, the method further includes a reflective electrode disposed on an outer surface of the first substrate.

Another pixel structure of the present invention has a plurality of sub-pixel regions. The pixel structure includes a first substrate, a second substrate, a plurality of first partition walls, a plurality of second partition walls, a plurality of first pixel electrodes, a plurality of second pixel electrodes, and a color A display medium, a black display medium, a light transmissive display medium, and a color filter layer. The second substrate and the first substrate are spaced apart from each other. The first partition wall is disposed on the first substrate and the first partition wall is located at a boundary of the sub-pixel area. The second partition wall is disposed on the second substrate, and the second partition wall is located at the boundary of the sub-pixel area. The first pixel electrodes are disposed on the first substrate and are respectively located in the sub-pixel regions. The second pixel electrodes are disposed on the second substrate and are respectively located in the sub-pixel regions. The color display medium is disposed on the first substrate. The color display medium includes a first color drop disposed in one of the sub-pixel regions. The black display medium is disposed on the second substrate and located between the second partition walls. The light transmissive display medium is disposed between the color display medium and the black display medium. The color filter layer is disposed on one of the first substrate and the second substrate. The color filter layer includes a first color pattern, a second color pattern, and a third color pattern, which are respectively disposed in different sub-pixel regions. The first color pattern is located in the same sub-pixel area as the first color drop and the first color pattern has the same color as the first color drop.

In an embodiment of the invention, the first color pattern is different from the color density of the first color drop.

In an embodiment of the invention, the colors of the first color pattern, the second color pattern, and the third color pattern are red, blue, and green, respectively.

In an embodiment of the invention, the color of the first color pattern is green.

In an embodiment of the invention, the color display medium further includes a second color drop. The second color drop and the second color pattern are located in the same one of the sub-pixel regions and the second color pattern has the same color as the second color drop.

In an embodiment of the invention, the pixel structure further includes a reflective electrode It is disposed on the outer surface of the first substrate.

Based on the above, the color filter pattern in the color filter layer of the embodiment of the present invention has a plurality of convex patterns that have been protruded from one of the pixel regions into the adjacent pixel regions. Thus, when the color filter layer is applied to a display, the design of the color filter layer helps to improve the color shift of the display. In addition, the boundary between two adjacent color filter patterns can provide a black matrix and the configuration of the black matrix can be selectively omitted.

The above described features and advantages of the invention will be apparent from the following description.

100, 200, 300‧‧‧ pixel structure

101, 201‧‧‧ no electrode

102, 104, 106, 202, 204, 206, 302, 304, 306 ‧ ‧ sub-pixel regions

110, 210‧‧‧ first substrate

112‧‧‧ film layer

120, 220‧‧‧ second substrate

130‧‧‧ partition wall

140‧‧‧ pixel electrodes

150‧‧‧Common electrode

160‧‧‧Colored display medium

170, 270‧‧‧Light display medium

180, 280‧‧‧ color filter layer

182, 382‧‧‧ first color pattern

184, 384‧‧‧ second color pattern

186, 386‧‧‧ third color pattern

212‧‧‧First film

222‧‧‧ second film

232‧‧‧First partition

234‧‧‧Second partition

242‧‧‧ first pixel electrode

244‧‧‧Second pixel electrode

250‧‧‧Color display media

260‧‧‧Black display medium

290‧‧‧Black matrix

392‧‧‧First active component

394‧‧‧Second active components

396‧‧‧Reflective electrode

398‧‧‧Light source

B‧‧‧ blue droplets

b, b1, c, g, g1, m, r, r1, y‧‧‧ coordinate points

C‧‧‧Cyan pattern

G‧‧‧Green droplets

L‧‧‧Show light

M‧‧‧Magenta pattern

R‧‧‧ red droplets

R100, R200‧‧‧ range

Y‧‧‧ yellow pattern

1A is a cross-sectional view of a pixel structure 100 in accordance with an experimental example of the present invention.

FIG. 1B is a cross-sectional view showing the pixel structure 100 of FIG. 1A biased.

2A is a cross-sectional view of a pixel structure 200 in accordance with another experimental example of the present invention.

2B is a cross-sectional view of the pixel structure 200 of FIG. 2A when a bias voltage is applied.

FIG. 3 illustrates a chromaticity diagram of CIE 1931.

4 is a cross-sectional view showing a pixel structure according to an embodiment of the present invention.

1A is a cross-sectional view of a pixel structure 100 in accordance with an experimental example of the present invention, and FIG. 1B is a cross-sectional view of the pixel structure 100 of FIG. 1A when a bias voltage is applied. please Referring to FIGS. 1A and 1B , the pixel structure 100 includes a first substrate 110 , a second substrate 120 , a plurality of partition walls 130 , a plurality of pixel electrodes 140 , a common electrode 150 , and a plurality of colored display media 160 . The light display medium 170 and a color filter layer 180. Further, the pixel structure 100 may have a plurality of sub-pixel regions 102, 104, and 106.

The first substrate 110 and the second substrate 120 are spaced apart from each other. A film layer 112 is disposed on the first substrate 110, and the film layer 112 faces the second substrate 120. The partition wall 130 is disposed on the film layer 112, and the partition wall 130 is located between the film layer 112 and the second substrate 120. Specifically, the partition wall 130 is disposed at the boundary of the sub-pixel regions 102, 104, and 106 to divide the pixel structure 100 into a plurality of sub-pixel regions 102, 104, and 106.

The pixel electrode 140 is located between the first substrate 110 and the film layer 112 and is located in the sub-pixel regions 102, 104 and 106, respectively. In addition, the area of each of the pixel electrodes 140 does not fill the corresponding one of the sub-pixel regions 102, 104 or 106, so each of the sub-pixel regions 102, 104 or 106 further includes an electrodeless portion 101, wherein the electrodeless portion 101 is located between the pixel electrode 140 and the partition wall 130.

The colored display medium 160 is disposed between the film layer 112 and the second substrate 120 and is located in each of the sub-pixel regions 102, 104, and 106 separated by the partition wall 130. The colored display medium 160 is, for example, a colored or black oil droplet. The light-transmitting display medium 170 is disposed between the film layer 112 and the second substrate 120. The common electrode 150 is disposed between the light-transmitting display medium 170 and the second substrate 120. The first substrate 110 and the second substrate 120 may be a flexible substrate, a glass or an active device array substrate, respectively.

In the present experimental example, the color filter layer 180 is disposed on the first substrate 110, and the pixel electrode 140 is disposed between the color filter layer 180 and the film layer 112, but is not limited thereto. this. The pixel electrode 140 can also be disposed between the color filter layer 180 and the first substrate 110. In addition, the color filter layer 180 can also be disposed on the second substrate 120 or between the common electrode 150 and the second substrate 120. In addition, the color filter layer 180 includes a first color pattern 182, a second color pattern 184, and a third color pattern 186, and the first color pattern 182, the second color pattern 184, and the third color pattern 186 are respectively located in the sub-pixel. The area 102, the sub-pixel area 104 and the sub-pixel area 106 are included.

When the first color pattern 182, the second color pattern 184, and the third color pattern 186 When the colors are red, green, and blue, the sub-pixel area 102, the sub-pixel area 104, and the sub-pixel area 106 are respectively a red pixel area, a green pixel area, and a blue pixel area. However, the colors of the first color pattern 182, the second color pattern 184, and the third color pattern 186 may be other color combinations, such as cyan, magenta, and yellow, without being limited to the three primary colors.

The light-transmitting display medium 170 and the partition wall 130 are composed of a polar substance, and the film layer 112 and the colored display medium 160 are composed of a non-polar substance. When the pixel structure 100 is not biased, as shown in FIG. 1A, the colored display medium 160 is laid and spread over the film layer 112. In the case where the colored display medium 160 is a black oil droplet, the light incident on the pixel structure 100 will be absorbed to display a dark state picture. In the case where the colored display medium 160 is a colored oil droplet, the spectral ranges of the light that the colored display medium 160 and the color filter layer 180 can transmit do not overlap each other. Therefore, light that can pass through a specific spectral range of the colored display medium 160 is absorbed in the color filter layer 180 and cannot be penetrated. Alternatively, light that passes through a particular spectral range of the color filter layer 180 will also be absorbed in the colored display medium 160 and will not penetrate. Taking this picture The prime structure 100 can assume a black state, that is, display a dark state picture.

As shown in FIG. 1B, applying an electric voltage to the common electrode 150 and the pixel electrode 140 to form an electric field therebetween will cause the film layer 112 originally composed of a non-polar material to tend to be polarized. Meanwhile, the film layer 112 corresponding to the electrodeless portion 101 is less affected by the electric field of the pixel electrode 140, and the phenomenon that the film layer 112 corresponding to the electrodeless portion 101 tends to be polarized is less noticeable. At this time, the non-polar colored display medium 160 is less likely to adhere to the film layer 112 corresponding to the pixel electrode 140, and the polar light-transmitting display medium 170 will face the colored display medium 160 because of the increased adsorption with the film layer 112. The electrodeless portion 101 is pushed.

Therefore, when the pixel structure 100 is driven by a voltage application, at least a portion of the light passing through the pixel structure 100 can pass through the color filter layer 180 and the light-transmitting display medium 170 without passing through the colored display medium 160. As a result, the light passing through only the color filter layer 180 and the light-transmitting display medium 170 will exhibit the colors of the first color pattern 182, the second color pattern 184, and the third color pattern 186 of the color filter layer 180.

When it is desired to adjust the ratio of the light passing through only the color filter layer 180 and the light-transmitting display medium 170, it is possible to change the bias voltage of the common electrode 150 and the pixel electrode 140. For example, in FIG. 1B, when the driving is strong, the colored display medium 160 in the sub-pixel area 102 moves almost all toward the position of the electrodeless portion 101 and aggregates. In addition, by the adjustment of the bias voltage, the colored display medium 160 in the sub-pixel area 104 may have a portion moved to the position of the electrodeless portion 101 and aggregated, and the colored display medium 160 in the sub-pixel area 106 may have more a small portion to the electrodeless portion 101 The location moves and aggregates. The display effect of different gray scales can be achieved by the ratio of the colored display medium 160 to the position of the electrodeless portion 101.

2A is a cross-sectional view of a pixel structure 200 in accordance with another experimental example of the present invention. Referring to FIG. 2A , the pixel structure 200 includes a first substrate 210 , a second substrate 220 , a plurality of first partition walls 232 , a plurality of second partition walls 234 , a plurality of first pixel electrodes 242 , and a plurality of pixels. The two pixel electrodes 244, a color display medium 250, a black display medium 260, a light transmissive display medium 270, and a color filter layer 280.

The first substrate 210 and the second substrate 220 are spaced apart from each other. A first film layer 212 is disposed on the first substrate 210. A second film layer 222 is disposed on the second substrate 220. The first film layer 212 faces the second film layer 222. The first partition wall 232 and the second partition wall 234 are disposed between the first film layer 212 and the second film layer 222, wherein the first partition wall 232 is disposed on the first film layer 212, and the second partition wall 234 is disposed. On the second film layer 222. The first partition wall 232 and the first partition wall 234 are disposed to face each other. Specifically, the first partition wall 232 and the second partition wall 234 divide the pixel structure 200 into a plurality of sub-pixel regions 202, 204, and 206, that is, the first partition wall 232 and the second partition wall 234 are located in the sub-pixel. The junction of regions 202, 204 and 206.

The first pixel electrodes 242 are located between the first substrate 210 and the first film layer 212, and the second pixel electrodes 244 are located between the second substrate 220 and the second film layer 222. The three first pixel electrodes 242 are located within the sub-pixel regions 202, 204, and 206, respectively, and the three second pixel electrodes 244 are located within the sub-pixel regions 202, 204, and 206, respectively. Each of the sub-pixel regions 202, 204, and 206 further includes an electrodeless portion 201. The electrodeless portion 201 is located between the first pixel electrode 242 and the first partition wall 232 and is located The second pixel electrode 244 is between the second partition wall 234. The first pixel electrode 242 and the second pixel electrode 244 may be a single layer or a multilayer structure, and the material thereof comprises a transparent conductive material, such as: indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide. A material, an indium gallium zinc oxide, or a thin metal material having a thickness of less than 50 nm, or an organic material mixed with at least one of the above materials, or other suitable materials. The first film layer 212 and the second film layer 222 may be a single layer or a multilayer structure, and the material thereof comprises an inorganic or organic insulating material, such as: cerium oxide, cerium nitride, cerium oxynitride, metal oxide, metal nitride, Metal oxynitride, parylene, fluoropolymer, or other suitable material.

The color display medium 250 is disposed on the first film layer 212 and is located within the sub-pixel regions 202, 204 and 206 between the first partition walls 232. The color display medium 250 includes a red droplet R, a green droplet G, and a blue droplet B, for example, three primary colors, and the red droplet R, the green droplet G, and the blue droplet B are respectively disposed on the sub-pixel. Within regions 202, 204 and 206. The black display medium 260 is disposed on the second film layer 222, and the black liquid droplets of the black display medium 260 are respectively located in the sub-pixel regions 202, 204, and 206 between the second partition walls 234. The light-transmitting display medium 270 is disposed between the first film layer 212 and the second film layer 222 to separate the color display medium 250 from the black display medium 260, wherein the light-transmitting display medium 270 is, for example, transparent and colorless, but The invention is not limited to this. The first substrate 210 and the second substrate 220 may be a flexible substrate, a glass substrate, or an active device array substrate.

The color filter layer 280 is disposed on the first substrate 210, and the first pixel electrode 242 is disposed between the color filter layer 280 and the first film layer 212, but is not limited thereto. In its In the embodiment, the first pixel electrode 242 can also be disposed between the color filter layer 280 and the first substrate 210. In addition, the color filter layer 280 can also be disposed on the second substrate 220 or between the second pixel electrode 244 and the second substrate 220. The color filter layer 280 includes a magenta pattern M, a yellow pattern Y, and a Cyan pattern C. Here, in the color filter layer 280 and the color display medium 250 in the same sub-pixel regions 202, 204, and 206, the wavelength spectrum ranges through which light can pass are partially overlapped.

For example, magenta is a color that absorbs green and allows light of other colors to pass. Yellow is a color that absorbs blue and allows light of other colors to pass, so yellow can correspond to colors other than blue. Cyan is a color that absorbs red and allows light of other colors to pass, so cyan can correspond to colors other than red. In the present embodiment, the magenta pattern M of the color filter layer 280 corresponds to the red droplet R, the yellow pattern Y of the color filter layer 280 corresponds to the green droplet G, and the cyan pattern C of the color filter layer 280 corresponds to Blue drop B.

In the present experimental example, a black matrix 290 can be selectively disposed on the second film layer 222 of the second substrate 220 and located in the electrodeless portion 201. By the arrangement of the black matrix 290, it is ensured that the electrodeless portion 201 appears black without being affected by the color of the display medium. In other embodiments, the black matrix 290 may be omitted.

The light transmissive display medium 270, the first partition wall 232, and the second partition wall 234 are all composed of a polar substance. The first film layer 212, the second film layer 222, the black display medium 260, and the color display medium 250 are all composed of a non-polar substance. Therefore, the first film layer 212, the second film layer 222, the black display medium 260, and the color display medium 250 are all Now hydrophobic. When the pixel structure is not applied to the pixel structure 200, the first film layer 212 and the color display medium 250 are both hydrophobic, and the color display medium 250 is laid and spread on the first film layer 212. The second film layer 222 and the black display medium 260 are both hydrophobic in nature, and the black display medium 260 is laid and spread on the second film layer 222.

In the present experimental example, when the display state of the pixel structure 200 is to be controlled, it can be implemented in a manner similar to that of FIG. 1B. For example, a bias may be applied to the first pixel electrode 242 or the second pixel electrode 244 to adjust the distribution of the color display medium 250 and the black display medium 260. The black display medium 260 will absorb almost all of the visible light, so the distribution state of the black display medium 260 can be adjusted by applying a bias voltage to the second pixel electrode 244 to change the amount of light passing through the pixel structure 200. At this time, the gray scales displayed by the respective sub-pixel regions 202, 204, and 206 can be implemented separately.

In addition, when the color displayed by each of the sub-pixel regions 202, 204, and 206 is to be changed, the distribution state of the color display medium 250 can be adjusted by applying a bias voltage to the first pixel electrode 242. For example, FIG. 2B is a cross-sectional view of the pixel structure 200 of FIG. 2A when a bias voltage is applied. When the pixel structure 200 is to be magenta colored, as shown in FIG. 2B, the first pixel electrode 242 and the second pixel electrode 244 in the sub-pixel region 204 and the sub-pixel region 206 may not be applied with voltage, and A voltage is applied to both the first pixel electrode 242 and the second pixel electrode 244 in the sub-pixel region 202. Thus, the black display medium 260 and the red liquid droplet R in the sub-pixel area 202 are gathered at the position of the electrodeless portion 201. Therefore, the light can pass only through the color filter layer 280 The magenta pattern M causes the pixel structure 200 to appear magenta. If the pixel structure 200 is to be rendered yellow or cyan, the light can be passed through the yellow pattern Y or the cyan pattern C in the color filter layer 280 in the same manner.

In addition, when the pixel structure 200 is to be rendered red, the black display medium 260 in the sub-pixel regions 204 and 206 is spread over the second film layer 222 and the black display medium 260 in the sub-pixel region 202 is gathered in none. Electrode portion 201. Furthermore, the red droplet R in the sub-pixel region 202 is developed on the first film layer 212. As such, light can pass through the magenta pattern M of the color filter layer 280 and the red droplets R. Since the magenta pattern M can pass light other than green, the red droplet R can only pass the red light, so only the red light can pass through the magenta pattern M and the red droplet R, so that the pixel structure 200 presents a red image. Of course, when the color between magenta and red is to be adjusted, the voltage of the first pixel electrode 242 can be adjusted to change the expansion range of the red droplet R.

FIG. 3 illustrates a chromaticity diagram of CIE 1931. Referring to FIG. 3, the pixel structure 100 of the foregoing experimental example is based on the colors of the first color pattern 182, the second color pattern 184, and the third color pattern 186 in the color filter layer 180 to display a color image, wherein the first color The colors of the pattern 182, the second color pattern 184, and the third color pattern 186 fall, for example, at coordinate points r, g, and b, respectively, in the chromaticity diagram of the CIE 1931. Therefore, the color that the pixel structure 100 can display falls within the range R100. The pixel structure 200 can present colors through the color display medium 250 and the color filter layer 280, wherein the colors of the color drops R, G, B in the color display medium 250 fall, for example, at coordinate points r, g, and b, respectively, and color The colors of the color patterns C, M, and Y in the filter layer 280 fall, for example, at the coordinate point c, m and y. Therefore, the color that the pixel structure 200 can display falls within the range R200. In contrast, the range R200 has a larger coverage area, so the pixel structure 200 can display more colors. Therefore, the present invention can adopt the design of the above pixel structure 200 as a basic concept, and set the color pattern of the color filter layer with the color drop in the same sub-pixel area to achieve an ideal color display effect. The spirit of the present invention will be further clarified by the following examples, but the present invention is not limited to the specific contents of the following examples.

4 is a cross-sectional view showing a pixel structure according to an embodiment of the present invention. Referring to FIG. 4, the pixel structure 300 is substantially the same as the pixel structure 200 of the foregoing FIG. 2A. Therefore, the same components in the two figures will be denoted by similar symbols, and will not be further described. In particular, the first substrate 210, the second substrate 220, the plurality of first partition walls 232, the plurality of second partition walls 234, the plurality of first pixel electrodes 242, the plurality of second pixel electrodes 244, and the black display medium 260. The arrangement position and function of the light-transmitting display medium 270 and the black matrix 290 can be referred to the related description of FIG. 2A and FIG. 2B. The difference between the present embodiment and FIG. 2A is mainly that the color filter layer 380 of the embodiment includes a first color pattern 382, a second color pattern 384 and a third color pattern 386, and the first color pattern 382 and the second color. The color of the pattern 384 and the third color pattern 386 is, for example, the same color as the red droplet R, the green droplet G, and the blue droplet B.

According to the description of FIG. 2A above, the colors of the red droplet R, the green droplet G, and the blue droplet B are respectively red, green, and blue among the three primary colors. Therefore, the first color pattern 382, the second color pattern 384, and the third color pattern 386 may be red, green, and blue, for example, three primary colors.

In this embodiment, the first color pattern 382 and the red liquid drop R are both located in the sub-pixel area 302, and the second color pattern 384 and the green liquid drop G are both located in the sub-pixel area 304, and the third color pattern 386 Both the blue drop B and the blue drop B are located in the sub-pixel area 308. Meanwhile, the color density of the color density of the first color pattern 382 and the red liquid droplet R is substantially the same, the color density of the second color pattern 384 and the green liquid droplet G are substantially the same, and the third color pattern 386 and the blue liquid droplet The color density of B is substantially the same, resulting in a more pure/bright red, green or blue color. In other embodiments, the color density of the first color pattern 382 and the red liquid drop R are substantially different, the color density of the second color pattern 384 and the green liquid drop G are substantially different, and the third color pattern 386 and the blue liquid The color density of the drop B is substantially different, and a red, green or blue color of a larger color range can be obtained, and the color vividness can still be maintained as much as possible.

The technical development of the color filter layer 380 is more mature than the technical development of the color display medium 250. The color of the color filter layer 380 can be adjusted according to different needs. Therefore, the first color pattern 382, the second color pattern 384 and the third color pattern 386 in the color filter layer 380 can be combined with the red liquid drop R, the green liquid drop G and the blue liquid drop B to achieve a more vivid color image. .

For example, referring to FIG. 3, when the color of each color pattern in the color filter layer 380 of the embodiment is indicated by the chromaticity diagram of the CIE 1931, the color of the first color pattern 382 falls, for example, at the coordinate point r1, and second. The color of the color pattern 384 falls, for example, at the coordinate point g1 and the color of the third color pattern 384 falls, for example, at the coordinate point b1. The coordinate point r1 is represented by red and the color density is different from the coordinate point r, the coordinate point g1 is represented by green and the color density is different from the coordinate point g, and the coordinate point b1 is represented by blue and the color density is different. At the punctuation point b.

As can be seen from FIG. 3, the coordinate point r1 is closer to the red end point with respect to the coordinate point r, the coordinate point g1 is closer to the green end point with respect to the coordinate point g, and the coordinate point b1 is closer to the blue end with respect to the coordinate point b. point. Therefore, the use of such a color filter layer 380 and color display medium 250 to display a color image may have a more vivid color representation, such as a higher color density than the pixel structure 200 of FIG. 2A. In addition, the image displayed by the pixel structure 300 can also meet the requirements of different display color protocols.

It is worth mentioning that the present invention does not limit the color filter layer 380 to have a pattern of three different colors to match the color display medium 250. In other embodiments, the pixel structure 300 can match the color pattern of the color filter layer 380 for only one or two of the colors to achieve the desired display effect. That is, when the color display medium 250 has three colors, the first color pattern 382, the second color pattern 384, and the third color pattern 386 may have only one or only two of them disposed in the pixel structure 300. Alternatively, when the color filter layer 380 has three colors, the red drop R, the green drop G, and the blue drop B may have only one or only two of them disposed in the pixel structure 300. For example, when the color density of green is insufficient, the first color pattern 382, the second color pattern 384, and the third color pattern 386 may selectively have only the second color pattern 384 disposed in the pixel structure 300. Alternatively, the red droplet R, the green droplet G, and the blue droplet B may have only the green droplet G disposed in the pixel structure 300. Of course, the above color selections are for illustrative purposes only and are not intended to limit the invention.

As the operation mode of the pixel structure 200, the pixel structure 300 can control the black display by applying a voltage to the first pixel electrode 242 and the second pixel electrode 244. The distribution of the display medium 260 and the color display medium 250 in each of the sub-pixel regions 302, 304, and 306 is implemented to achieve different gray levels and different color effects. Here, the pixel structure 300 may further include a plurality of first active elements 392 and a plurality of second active elements 394, wherein the first active elements 392 are respectively connected to the first pixel electrodes 242, and the second active elements 394 are respectively Connected to the second pixel electrode 244. In this way, different driving voltages can be input to the first pixel electrode 242 and the second pixel electrode 244 by the operation of the first active device 392 and the second active device 394.

Since the first active component 392 and the color filter layer 380 are disposed on the first substrate 210 in this embodiment, the first active component 392 and the color filter layer 380 can be integrated with each other to form an active component on the color filter layer. The structure of the active device on color filter array (AOC) or the structure of the color filter on array (COA). In addition, the color filter layer 380 can also be selectively disposed on the second substrate 220. At this time, the second active component 394 and the color filter layer 380 may be integrated with each other to constitute a structure of the active component on the color filter layer or a structure of the color filter layer on the active component.

In addition, the pixel structure 300 may further include a reflective electrode 396 disposed on an outer surface of the first substrate 210. Therefore, the light incident on the pixel structure 300 by the second substrate 220 can be reflected by the reflective electrode 396 for display. Additionally, the actual display device design may further include a light source 398 that is configured to provide display light L toward the pixel structure 300. For example, the light source 398 is disposed on a side of the first substrate 210 such that the first substrate 210 functions as a light guiding element. In other embodiments, a light guiding component (not labeled) is further disposed on the first substrate 210 and the reflective electrode. Between 396, a light guiding effect is provided. Therefore, the display light L can be incident on the display medium (including the color display medium 250, the black display medium 260, and the light-transmitting display medium 270) via the reflection of the reflective electrode 396 for display. If the pixel structure 300 does not include the reflective electrode 396, the light may be incident from the first substrate 210 or the second substrate 220 as a transparent display.

The design of the light source 398 and the reflective electrode 396 described above can also be applied to the pixel structure 200 of FIG. 2A. Therefore, the pixel structure 200 of FIG. 2A and the pixel structure 300 of FIG. 4A can be applied to the transmissive display technology as well as to the reflective display technology.

In summary, the pixel structure of the embodiment of the present invention uses the color filter layer and the color liquid of the color display medium to have the same color but different concentrations to improve the pixel structure of the electrowetting display technology, which generally has the disadvantage of poor color performance. . In addition, the pixel structure of the embodiment of the present invention can select to simultaneously set a color pattern and a color drop to display a desired color for a specific color.

201‧‧‧No electrode

210‧‧‧First substrate

212‧‧‧First film

220‧‧‧second substrate

222‧‧‧ second film

232‧‧‧First partition

234‧‧‧Second partition

242‧‧‧ first pixel electrode

244‧‧‧Second pixel electrode

250‧‧‧Color display media

260‧‧‧Black display medium

270‧‧‧Light display medium

290‧‧‧Black matrix

300‧‧‧ pixel structure

302, 304, 306‧‧‧ sub-pixel area

380‧‧‧Color filter layer

382‧‧‧First color pattern

384‧‧‧Second color pattern

386‧‧‧ third color pattern

392‧‧‧First active component

394‧‧‧Second active components

396‧‧‧Reflective electrode

398‧‧‧Light source

B‧‧‧ blue droplets

G‧‧‧Green droplets

L‧‧‧Show light

R‧‧‧ red droplets

Claims (18)

A pixel structure having a plurality of sub-pixel regions, the pixel structure comprising: a first substrate; a second substrate spaced apart from the first substrate; and a plurality of first partition walls disposed on the first substrate And the first partition walls are located at the intersection of the sub-pixel regions; the plurality of second partition walls are disposed on the second substrate, and the second partition walls are located in the sub-pixel regions a plurality of first pixel electrodes disposed on the first substrate and located in the sub-pixel regions; a plurality of second pixel electrodes disposed on the second substrate and located in the sub-pixel regions a color display medium disposed on the first substrate, the color display medium comprising a first color drop, a second color drop, and a third color drop, separated by the first partition walls Separately disposed in the different sub-pixel regions; a black display medium disposed on the second substrate and located between the second partition walls; a light transmissive display medium disposed on the color display medium and the Black display medium; and a color filter layer, On the first substrate and the second substrate, the color filter layer includes a first color pattern, and the first color pattern is located in the same sub-pixel region as the first color drop and the First color pattern and the first color liquid The drops have the same color. The pixel structure of claim 1, wherein the first color pattern is different from the color density of the first color drop. The pixel structure of claim 1, wherein the colors of the first color drop, the second color drop, and the third color drop are red, blue, and green, respectively. The pixel structure of claim 1, wherein the color of the first color drop is green. The pixel structure of claim 1, wherein the color filter layer further comprises a second color pattern, wherein the second color pattern is located in the same sub-pixel region as the second color drop and The second color pattern has the same color as the second color drop. The pixel structure of claim 1, wherein the color filter layer further comprises a third color pattern, wherein the third color pattern is located in the same sub-pixel region as the third color drop and The third color pattern has the same color as the third color drop. The pixel structure of claim 1, wherein each of the sub-pixel regions further includes an electrodeless portion between each of the first pixel electrodes and one of the first partition walls, and each of The second pixel electrode is between the second partition wall and one of the second partition walls. The pixel structure of claim 1, wherein the black display medium and the color display medium are composed of a non-polar material, and the light-transmitting display medium and the partition walls are composed of a polar substance. The pixel structure of claim 1, further comprising a plurality of first active components and a plurality of second active components, wherein the first active components respectively drive the first pixel electrodes, and the The two active components respectively drive the second pixel electrodes. The pixel structure of claim 9, wherein the color filter layer is integrated with the first active components when the color filter layer is disposed on the first substrate. The pixel structure of claim 9, wherein the color filter layer is integrated with the second active components when the color filter layer is disposed on the second substrate. The pixel structure of claim 1, further comprising a reflective electrode disposed on an outer surface of the first substrate. A pixel structure having a plurality of sub-pixel regions, the pixel structure comprising: a first substrate; a second substrate spaced apart from the first substrate; and a plurality of first partition walls disposed on the first substrate And the first partition walls are located at the intersection of the sub-pixel regions; the plurality of second partition walls are disposed on the second substrate, and the second partition walls are located in the sub-pixel regions a plurality of first pixel electrodes disposed on the first substrate and located in the sub-pixel regions; a plurality of second pixel electrodes disposed on the second substrate and located in the plurality of pixels a color display medium disposed on the first substrate, the color display medium comprising a first color drop, the first color drop being disposed in one of the sub-pixel regions; a black display medium, The first substrate is disposed between the second partition walls; a light transmissive display medium is disposed between the color display medium and the black display medium; and a color filter layer is disposed on the first On the one of the substrate and the second substrate, the color filter layer includes a first color pattern, a second color pattern, and a third color pattern, respectively disposed in different sub-pixel regions, wherein the color pixel layer The first color pattern is located in the same sub-pixel area as the first color drop and the first color pattern has the same color as the first color drop. The pixel structure of claim 13, wherein the first color pattern is different from the color density of the first color drop. The pixel structure of claim 13, wherein the colors of the first color pattern, the second color pattern, and the third color pattern are red, blue, and green, respectively. The pixel structure of claim 13, wherein the color of the first color pattern is green. The pixel structure of claim 13, wherein the color display medium further comprises a second color drop, wherein the second color drop is located in the same sub-pixel area as the second color pattern and The second color pattern has a phase with the second color drop The same color. The pixel structure of claim 13, further comprising a reflective electrode disposed on an outer surface of the first substrate.