Color Filter Array for Reflective Display Device

Abstract

A color filter array for a reflective display device, which includes a plurality of first filter arrays, a plurality of second filter arrays, and a plurality of third filter arrays. Each first filter array has a plurality of first filter patterns separated from each other. Each second filter array has a plurality of second filter patterns separated from each other. Each third filter array has a plurality of third filter patterns separated from each other. Each first filter array is adjacent to one of the second filter arrays and one of the third filter arrays. This color filter array can effectively reduce the graininess of the image displayed by a display device including this color filter array.

Description

Technical Field

[0001] The present invention relates to a color filter array for a reflective display device. Background Art

[0002] In the current market of various consumer electronic products, reflective electrophoretic display devices have been widely used as display screens. The display medium layer of a reflective electrophoretic display device is mainly composed of an electrophoretic solution and white particles and black particles doped in the electrophoretic solution. By applying a voltage to the display medium layer, the white particles and black particles can be driven to move, so that each pixel can display black, white or gray levels respectively. Since a reflective electrophoretic display device uses incident light to irradiate the display medium layer to form reflected light for display purposes, a backlight source is not required, thus power consumption can be saved. The incident light can be sunlight or indoor ambient light.

[0003] As for a reflective color electrophoretic display device, a color filter array (CFA) is attached to the display medium layer. However, the graininess of the images displayed by current reflective color electrophoretic display devices is relatively obvious. Therefore, how to reduce the graininess of images has become an urgent issue to be solved in this field. Summary of the Invention

[0004] To solve the above problems, the present invention provides a color filter array for a reflective display device, which includes: a filter array having a plurality of filter patterns separated from each other or a plurality of filter units arranged in a staggered manner, so as to effectively reduce the graininess of the images displayed by a display device including this color filter array.

[0005] The present invention provides a color filter array for a reflective display device, which includes a plurality of first filter arrays, a plurality of second filter arrays and a plurality of third filter arrays. Each first filter array has a plurality of first filter patterns separated from each other. Each second filter array has a plurality of second filter patterns separated from each other. Each third filter array has a plurality of third filter patterns separated from each other. Each first filter array is adjacent to one of the second filter arrays and one of the third filter arrays.

[0006] According to some embodiments of the present invention, each first filter array, each second filter array and each third filter array are rectangular in the top view angle.

[0007] According to some embodiments of the present invention, each first filter array is adjacent to and substantially aligned with that one of the second filter arrays and that one of the third filter arrays along its length direction, and each first filter array is adjacent to and substantially aligned with the other one of the second filter arrays and the other one of the third filter arrays along its width direction.

[0008] According to some embodiments of the present invention, each first filter array is arranged in a staggered manner with respect to the corresponding one of the second filter arrays and the corresponding one of the third filter arrays along its width direction or its length direction.

[0009] According to some embodiments of the present invention, the ratio of the length to the width of each first filter array is between 1.8:1 and 5:1.

[0010] According to some embodiments of the present invention, the ratio of the width of each first filter array to the width of each first filter pattern is between 2:1 and 5:1.

[0011] According to some embodiments of the present invention, the ratio of the width of each first filter pattern to the spacing between two adjacent ones of the first filter patterns is between 1:1 and 3:1.

[0012] The present invention further provides a color filter array for a reflective display device, which includes a plurality of first filter units, a plurality of second filter units, and a plurality of third filter units. Each first filter unit is adjacent to one of the second filter units and one of the third filter units along a first direction, and one of the first filter units is adjacent to and arranged in a staggered manner with respect to the other of the second filter units and the other of the third filter units along a second direction, and the first direction and the second direction are perpendicular to each other.

[0013] According to some embodiments of the present invention, each first filter unit, each second filter unit, and each third filter unit are rectangular in a top view angle.

[0014] According to some embodiments of the present invention, the first direction is the length direction of each first filter unit, and the second direction is the width direction of each first filter unit.

[0015] According to some embodiments of the present invention, the projection of the first filter unit along the second direction partially overlaps with the other of the second filter units.

[0016] According to some embodiments of the present invention, the edges of the first filter unit and the other of the third filter units are flush with each other along the second direction.

[0017] According to some embodiments of the present invention, the ratio of the width of each first filter unit to the length of each first filter unit is greater than or equal to 1 / 3. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To make the above and other objects, features, advantages, and embodiments of the present invention more obvious and understandable, please refer to the following detailed description and the corresponding drawings:

[0019] Figure 1 A top view schematic diagram of a color filter array according to an embodiment of the present invention is shown;

[0020] Figure 2 Images of a display device with a color filter array composed of multiple solid filter patterns;

[0021] Figure 3 For a color filter array using Figure 1 Images of a display device;

[0022] Figure 4 Show Figure 1 An enlarged schematic diagram of the first filter array;

[0023] Figure 5 A top view schematic diagram of a color filter array according to an embodiment of the present invention;

[0024] Figure 6 A top view schematic diagram of a color filter array according to an embodiment of the present invention;

[0025] Figure 7 A top view schematic diagram of a color filter array according to an embodiment of the present invention;

[0026] Figure 8 Images of a display device with a color filter array composed of multiple solid filter patterns;

[0027] Figure 9 For a color filter array using Figure 7 Images of a display device;

[0028] Figure 10 A top view schematic diagram of a color filter array according to an embodiment of the present invention.

[0029]

Symbol description

[0030] 10, 20: Color filter array

[0031] 110: First filter array

[0032] 110a: First filter pattern

[0033] 120, 1202, 1204: Second filter array

[0034] 120a: Second filter pattern

[0035] 130, 1302, 1304: Third filter array

[0036] 130a: Third filter pattern

[0037] 210: First filter unit

[0038] 220, 2202, 2204: Second filter unit

[0039] 230, 2302, 2304: Third filter unit

[0040] D1: First direction

[0041] D2: Second direction

[0042] L: Length direction

[0043] L1, L2: Length

[0044] OL: Overlap length

[0045] OW: Overlap width

[0046] S1, S2, S3: Spacing

[0047] W: Width direction

[0048] W1, w1, W2: Width Detailed implementation manners

[0049] The following provides various different embodiments or examples of the present invention to implement different technical features of the provided subject matter. The elements and designs of the following specific examples are used to simplify the present invention. Of course, these are only examples and are not used to limit the present invention. For example, the embodiments disclosed in the specification that form the first feature structure above the second feature structure include embodiments in which the first feature structure and the second feature structure are in direct contact, and also include embodiments in which there are other feature structures between the first feature structure and the second feature structure, that is, the first feature structure and the second feature structure are not in direct contact. In addition, the present invention may use repeated reference symbols and / or words in each example. These repeated symbols or words are for the purpose of simplification and clarity, and are not used to limit the relationship between each embodiment and / or the described structures.

[0050] In addition, relative spatial terms, such as "lower", "upper", etc., are used to facilitate the description of the relative relationship between one element or feature and other elements or features in the drawings. These relative spatial terms are intended to include different orientations of the device during use or operation in addition to the orientations shown in the drawings. The device can be positioned otherwise (for example, rotated 90 degrees or other orientations), and the relative spatial descriptions used herein can be correspondingly interpreted.

[0051] To solve the above problems, the present invention provides a color filter array for a reflective display device, which includes: a filter array having a plurality of filter patterns separated from each other or a plurality of filter units arranged in a staggered manner to effectively reduce the graininess of the image displayed by a display device including this color filter array. In some embodiments, the reflective display device includes the color filter array of the present invention (refer to Figure 1 , 5, 6, 7, and 10), an array substrate (not shown), and a display medium layer (not shown). The display medium layer is disposed between the color filter array and the array substrate. The display medium layer can reflect incident light, enabling a user to view the image displayed by the display device. In some embodiments, the display medium layer includes microcapsules or microcups. Various embodiments of the color filter array of the present invention will be described in detail below.

[0052] Figure 1 FIG. shows a top view schematic diagram of a color filter array 10 according to an embodiment of the present invention. As Figure 1 shown, the color filter array 10 includes a plurality of first filter arrays 110, a plurality of second filter arrays 120, and a plurality of third filter arrays 130. The first filter array 110, the second filter array 120, and the third filter array 130 are filter arrays of different colors. In some embodiments, the first filter array 110 is a red filter array, the second filter array 120 is a green filter array, and the third filter array 130 is a blue filter array, but it is not limited thereto.

[0053] Each first filter array 110 has a plurality of first filter patterns 110a separated from each other. Each second filter array 120 has a plurality of second filter patterns 120a separated from each other. Each third filter array 130 has a plurality of third filter patterns 130a separated from each other. In this way, the color reflectivity and brightness of the display device can be significantly improved, effectively reducing the graininess of the image.

[0054] Figure 2 is an image of a display device with a color filter array composed of a plurality of solid filter patterns. Specifically, Figure 2 is a color filter array composed of general solid filter patterns (not shown). Although it has the same size and color as the first filter array 110, the second filter array 120, and the third filter array 130 of the present invention, the white state reflectivity of the display device with the color filter array composed of these solid filter patterns is 18%. As Figure 1 shown, the graininess of the image is quite obvious. Figure 2 shown, the graininess of the image is quite obvious.

[0055] Figure 3 is an image of a display device with a color filter array adopted Figure 1 . The white state reflectivity of the display device with the first filter array 110, the second filter array 120, and the third filter array 130 adopted Figure 1 is 26%. As Figure 3 shown, the graininess of the image is lower. It can be seen that adopting the first, second, and third filter arrays 110, 120, 130 of the present invention helps to improve the graininess of the image of the display device.

[0056] Please continue to refer to Figure 1 , each first filter array 110 is adjacent to one of the second filter arrays 120, i.e., 1202, and one of the third filter arrays 130, i.e., 1302. In some embodiments, each of the first filter arrays 110, the second filter arrays 120, and the third filter arrays 130 is rectangular in the upward viewing angle. In some embodiments, as Figure 1 shown, each first filter array 110 is adjacent to and substantially aligned with the one 1202 of the second filter array 120 and the one 1302 of the third filter array 130 along its length direction L, and each first filter array 110 is adjacent to and substantially aligned with the other 1204 of the second filter array 120 and the other 1304 of the third filter arrays 130 along its width direction W. In this specification, the term "substantially aligned" means that the projections of two adjacent elements along a certain direction (such as the length direction L or the width direction W) are completely overlapped or nearly completely overlapped.

[0057] Figure 4 Shows Figure 1 an enlarged schematic diagram of the first filter array 110. The following disclosed dimensional relationships regarding the first filter array 110 are also applicable to Figure 1 the second filter array 120 and the third filter array 130 shown in Figure 4 shown. In some embodiments, as Figure 4 shown, the ratio of the length L1 to the width W1 of the first filter array 110 is between 1.8:1 and 5:1. In some embodiments, the length L1 is between 200 microns and 260 microns, and the width W1 is between 50 microns and 110 microns.

[0058] In some embodiments, as Figure 4 shown, the ratio of the width W1 of each first filter array 110 to the width w1 of each first filter pattern 110a is between 2:1 and 5:1. In some embodiments, the width w1 is between 15 microns and 40 microns, such as 20 microns, 25 microns, 30 microns, or 35 microns.

[0059] In some embodiments, as Figure 4 shown, the ratio of the width w1 of each first filter pattern 110a to the spacing S1 between two adjacent first filter patterns 110a is between 1:1 and 3:1. In some embodiments, the spacing S1 is between 5 microns and 30 microns.

[0060] In some embodiments, the first filter pattern 110a is oval, but in other embodiments, the first filter pattern may also be in other shapes, such as circular or polygonal, such as square or rectangular.

[0061] Figure 5A top view schematic diagram of a color filter array 10 according to an embodiment of the present invention is shown. Figure 5 The embodiment of Figure 1 differs from the embodiment of

[0062] Figure 6 A top view schematic diagram of a color filter array 10 according to an embodiment of the present invention is shown. Figure 6 The embodiment of Figure 1 differs from the embodiment of

[0063] In this specification, the term "offset arrangement" means that the projections of two adjacent elements along a certain direction (such as the width direction W or the length direction L) partially overlap, or the edges of the two elements are flush with each other along a certain direction.

[0064] Figure 7 A top view schematic diagram of a color filter array 20 according to an embodiment of the present invention is shown. As Figure 7 shown, the color filter array 20 includes a plurality of first filter units 210, a plurality of second filter units 220, and a plurality of third filter units 230.

[0065] Specifically, each first filter unit 210 is adjacent to one of the second filter units 220 (2202) and one of the third filter units 230 (2302) along the first direction D1, and one of the first filter units 210 is adjacent to another of the second filter units 220 (2204) and another of the third filter units 230 (2304) along the second direction D2 (the second direction D2 is perpendicular to the first direction D1) and is arranged in an offset manner. In this specification, the term "offset arrangement" means that the projections of two adjacent elements along a certain direction partially overlap, or the edges of the two elements are flush with each other along a certain direction. In this way, it helps horizontal light (i.e., light along the second direction D2) to pass through the gaps between the first, second, and third filter units 210, 220, and 230, so that the light can be prevented from being confined in a specific area, and thus the graininess of the image displayed by the display device can be effectively reduced.

[0066] Figure 8 An image of a display device with a color filter array composed of a plurality of solid filter patterns. Figure 8 is a color filter array (not shown) composed of a general plurality of solid filter patterns, although it is related to the present invention Figure 1The first filter array 110, the second filter array 120, and the third filter array 130 have the same size and color, but as Figure 8 shown, the graininess of the image displayed by the display device using the color filter array composed of these solid filter patterns is obvious.

[0067] Figure 9 For the image of the display device using the Figure 7 color filter array. As Figure 9 shown, the graininess of the image displayed by the display device using the Figure 7 shown first filter unit 210, second filter unit 220, and third filter unit 230 is significantly reduced. It can be seen from this that using the first, second, and third filter units 210, 220, 230 arranged in a staggered manner according to the present invention helps to improve the graininess of the image displayed by the display device.

[0068] Please continue to refer to Figure 7 , in some embodiments, each first filter unit 210 is adjacent to and substantially aligned with the second filter unit 2202 and the third filter unit 2302 along the first direction D1.

[0069] In some embodiments, each first filter unit 210, each second filter unit 220, and each third filter unit 230 are rectangular in the top view angle. In some embodiments, the above-mentioned first direction D1 is the length direction of each first filter unit 210, and the second direction D2 is the width direction of each first filter unit 210. In some embodiments, the length L2 of each first filter unit 110 is between 100 microns and 150 microns. In some embodiments, the width W2 of each first filter unit 210 is between 30 microns and 55 microns. In some embodiments, the ratio of the width W2 to the length L2 is greater than or equal to 1 / 3. The above and the following disclosed size relationships regarding the first filter unit 110 are also applicable to the Figure 7 shown second filter unit 220 and third filter unit 230. In some embodiments, after the reliability test, the filter units (such as the first filter unit 210, the second filter unit 220, or the third filter unit 230) with a W2 / L2 ratio greater than or equal to 1 / 3 will not break or generate bubbles.

[0070] In some embodiments, the edges of the first filter unit 210 and the edges of the third filter unit 2304 are flush with each other along the second direction D2 (i.e., the width direction).

[0071] In some embodiments, the projection of the first light filtering unit 210 along the second direction D2 (i.e., the width direction) partially overlaps with the second light filtering unit 2204, and there is an overlapping length OL therebetween, and the overlapping length OL is less than the length L2 of each first light filtering unit 110. In some embodiments, the overlapping length OL is between 5 microns and 80 microns, such as 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, 55 microns, 60 microns, 65 microns, 70 microns, or 75 microns. In some embodiments, the ratio of the length L2 to the overlapping length OL is between 1.3:1 and 30:1.

[0072] In some embodiments, the overlapping length OL is less than or equal to the spacing S2 between the first light filtering unit 210 and the adjacent second light filtering unit 2202. In some embodiments, the overlapping length OL is between 5 microns and 50 microns, and the spacing S2 is between 30 microns and 50 microns.

[0073] In some embodiments, the spacing S2 is greater than or equal to the spacing S3 between the first light filtering unit 210 and the adjacent second light filtering unit 2204. In some embodiments, the spacing S3 is between 25 microns and 45 microns.

[0074] Figure 10 The top view schematic diagram of the color filter array according to an embodiment of the present invention is shown. Figure 10 The embodiment of Figure 7 The difference between the embodiment of

[0075] In some embodiments, as Figure 10 shown, the projection of the first light filtering unit 210 along the second direction D2 (i.e., the length direction) partially overlaps with the second light filtering unit 2204, and there is an overlapping width OW therebetween. In some embodiments, the overlapping width OW is between 5 microns and 45 microns. In some embodiments, the ratio of the width W2 of the first light filtering unit 210 to the overlapping width OW is between 1.3:1 and 30:1.

[0076] The features of the various embodiments are briefly mentioned above, so that those skilled in the art can better understand various aspects of the present invention. Those skilled in the art should realize that, for the purpose of achieving the same object and / or attaining the same advantages as those of the embodiments presented herein, they can readily use the present invention as a basis for designing or modifying other processes and structures. It should also be understood by those skilled in the art that these equivalent structures do not depart from the spirit and scope of the present invention, and that they can make various changes, substitutions, and alternations herein without departing from the spirit and scope of the present invention.

Claims

1. A color filter array for a reflective display device, characterized in that, comprising: a plurality of first filter arrays, each of the first filter arrays having a plurality of first filter patterns separated from each other; a plurality of second filter arrays, each of the second filter arrays having a plurality of second filter patterns separated from each other; and a plurality of third filter arrays, each of the third filter arrays having a plurality of third filter patterns separated from each other, and each of the first filter arrays adjacent to one of the second filter arrays and one of the third filter arrays, wherein each of the first filter arrays is arranged in a staggered manner with respect to the one of the second filter arrays and the one of the third filter arrays in a width direction, such that the projection of each of the first filter arrays in the width direction only partially overlaps with the projection of the one of the second filter arrays and the one of the third filter arrays in the width direction, wherein the colors among the first filter arrays, the second filter arrays, and the third filter arrays are different, and the one of the second filter arrays arranged in a staggered manner with respect to each of the first filter arrays in the width direction and the one of the third filter arrays arranged in a staggered manner with respect to each of the first filter arrays in the width direction are completely overlapped in the width direction, wherein there is an overlapping length between the projection of each of the first filter arrays in the width direction and the one of the second filter arrays, and the overlapping length is less than or equal to the spacing between each of the first filter arrays and one of the second filter arrays adjacent to each of the first filter arrays in a length direction, and wherein the ratio of the length of each of the first filter arrays in the length direction to the overlapping length is between 1.3:1 and 30:

1.

2. The color filter array according to claim 1, characterized in that, each of the first filter arrays, each of the second filter arrays, and each of the third filter arrays are rectangular in a top view angle.

3. The color filter array according to claim 1, characterized in that, the ratio of the length to the width of each of the first filter arrays is between 1.8:1 and 5:

1.

4. The color filter array according to claim 1, characterized in that, the ratio of the width of each of the first filter arrays to the width of each of the first filter patterns is between 2:1 and 5:

1.

5. The color filter array according to claim 1, characterized in that, the ratio of the width of each of the first filter patterns to the spacing between two adjacent ones of the first filter patterns is between 1:1 and 3:

1.

6. A color filter array for a reflective display device, characterized in that, comprising: a plurality of first filter units; a plurality of second filter units; and a plurality of third filter units, each of the first filter units adjacent to one of the second filter units and one of the third filter units in a first direction, and one of the first filter units adjacent to and arranged in a staggered manner with another of the second filter units and another of the third filter units in a second direction, the first direction and the second direction being perpendicular to each other, An overlapping length exists between the projection of each of the first light filtering units along the second direction and another one of the second light filtering units, and the overlapping length is less than or equal to the distance between each of the first light filtering units and one of the second light filtering units adjacent to each of the first light filtering units along the first direction, and a ratio of a length of each of the first light filtering units along the first direction to the overlapping length ranges from 1.3:1 to 30:

1.

7. The color filter array according to claim 6, wherein, each of the first light filtering units, each of the second light filtering units, and each of the third light filtering units are rectangular in a top view angle.

8. The color filter array according to claim 7, wherein, the first direction is the length direction of each of the first light filtering units, and the second direction is the width direction of each of the first light filtering units.

9. The color filter array according to claim 6, wherein, edges of the first light filtering unit and edges of the other one of the third light filtering units are flush with each other along the second direction.

10. The color filter array according to claim 6, wherein, a ratio of the width of each of the first light filtering units to the length of each of the first light filtering units is greater than or equal to 1 / 3.

Images