Display device

Abstract

A display device includes a first substrate, a color filter conductive structure, a display medium, a second substrate, and a common electrode. The second substrate is disposed opposite to the first substrate. The display medium is disposed on the first substrate. The common electrode is disposed on the second substrate. The color filter conductive structure is disposed between the display medium and the common electrode and is electrically connected to the common electrode.

Description

Technical Field

[0001] This invention relates to a display device, and more particularly to a display device comprising a color filter conductive structure. Prior Technology

[0002] Color display devices produce a full-color effect by passing light through a color filter pattern. However, the sheet resistance of a typical color filter pattern is relatively high. When placed between the pixel electrode and the common electrode, it causes a decrease in the electric field strength driving the display medium, resulting in poor optical performance, such as low contrast, which in turn affects the display quality of the color display device. Summary of the Invention

[0003] At least one embodiment of the present invention provides a display device comprising a color filter conductive structure electrically connected to a common electrode, which can maintain the electric field strength driving the display medium and avoid poor optical performance due to a decrease in electric field strength, such as low contrast, which would affect the display quality of the display device.

[0004] The display device provided in at least one embodiment of the present invention includes a first substrate, a color filter conductive structure, a display medium, a second substrate, and a common electrode. The second substrate is disposed opposite to the first substrate. The display medium is disposed on the first substrate. The common electrode is disposed on the second substrate. The color filter conductive structure is disposed between the display medium and the common electrode and is electrically connected to the common electrode.

[0005] In at least one embodiment of the present invention, the color filter conductive structure includes a conductive layer and a plurality of color filter patterns. The conductive layer is disposed on the display medium and electrically connected to the common electrode. The color filter patterns are formed on the conductive layer and located between the conductive layer and the common electrode.

[0006] In at least one embodiment of the present invention, the conductive layer comprises a transparent conductive layer.

[0007] In at least one embodiment of the present invention, the material of the transparent conductive layer comprises a conductive polymer, indium tin oxide, zinc oxide, indium zinc oxide, carbon nanotubes, silver nanotubes, or a combination of the foregoing materials.

[0008] In at least one embodiment of the present invention, the first substrate includes a plurality of pixel electrodes, which respectively correspond to the plurality of color filter patterns.

[0009] In at least one embodiment of the present invention, the sheet resistance of the conductive layer is less than 1 MΩ / □.

[0010] In at least one embodiment of the present invention, the sheet resistance of the plurality of color filter patterns is not less than 1 GΩ / □.

[0011] In at least one embodiment of the present invention, the conductive layer comprises a plurality of conductive patterns that are separated from each other.

[0012] In at least one embodiment of the present invention, the color filter conductive structure includes a plurality of color filter conductive patterns, which directly contact the common electrode to electrically connect the common electrode.

[0013] In at least one embodiment of the present invention, the sheet resistance of the plurality of color filter conductive patterns is less than 1 MΩ / □. Simple Explanation of the Diagram

[0014] Figure 1 is a top view schematic diagram of a display device according to at least one embodiment of the present invention. Figure 2 is a partial cross-sectional schematic diagram of the display area of ​​a display device according to at least one embodiment of the present invention. Figure 3 is a partial cross-sectional schematic diagram of the display area of ​​a display device according to at least another embodiment of the present invention. Figure 4 is a partial cross-sectional schematic diagram of the display area of ​​a display device according to at least another embodiment of the present invention. Implementation

[0015] The embodiments of the present invention are discussed in detail below. However, it will be understood that the embodiments provide many applicable concepts that can be implemented in a wide variety of specific contexts. The discussed and disclosed embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0016] To clearly illustrate the technical features of this invention, the dimensions of the components in the drawings are enlarged proportionally, and the number of some components is reduced. Therefore, the description and explanation of the embodiments of this invention are not limited to the number of components in the drawings or the dimensions and shapes presented by the components, but should cover dimensions, shapes, and deviations from both caused by actual manufacturing processes and / or tolerances. For example, a flat surface shown in the drawings may have rough and / or non-linear characteristics, and an acute angle shown in the drawings may be a rounded corner. Therefore, the components presented in the drawings are primarily for illustration and are not intended to precisely depict the actual shape of the components, nor are they intended to limit the scope of protection claimed by this invention.

[0017] Secondly, the terms "approximately," "approximately," or "substantially" used in this invention not only cover explicitly stated numerical values ​​and ranges, but also the permissible deviation range understandable to those skilled in the art. This deviation range can be determined by errors generated during measurement, which may be caused by limitations of the measurement system or process conditions. "Approximately" can mean within one or more standard deviations of the aforementioned numerical values, such as ±30%, ±20%, ±10%, or ±5%. The acceptable deviation range or standard deviation used in this invention can be selected based on optical properties, etching properties, mechanical properties, or other properties, and is not applied to all optical properties, etching properties, mechanical properties, and other properties using only one standard deviation.

[0018] The spatial relative terms used in this invention, such as "below," "under," "above," and "above," are for the convenience of describing the relative relationship between one element or feature and another, as illustrated in the figures. The true meaning of these spatial relative terms includes other orientations. For example, when the illustration is rotated 180 degrees vertically, the relationship between one element and another may change from "below" or "under" to "above" or "above." Furthermore, the spatial relative descriptions used in this invention should be interpreted in the same way.

[0019] It should be understood that although the present invention may use terms such as "first," "second," and "third" to describe various elements or features, these elements or features should not be limited by these terms. These terms are primarily used to distinguish one element from another, or one feature from another. Furthermore, the term "or" as used in the present invention may, as appropriate, include any combination of one or more of the associated listed items.

[0020] Furthermore, the present invention can be implemented or applied through other different specific embodiments, and the various details of the present invention can also be combined, modified and changed in various embodiments based on different viewpoints and applications without departing from the concept of the present invention.

[0021] Figure 1 is a top view of a display device 10 according to at least one embodiment of the present invention. Figure 2 is a partial cross-sectional view of the display area AA of the display device 10 according to at least one embodiment of the present invention. Referring to Figures 1 and 2, the display device 10 has a display area AA and a peripheral area PA adjacent to the display area AA, and the display device 10 includes a first substrate 100, a color filter conductive structure 200, a display medium 300, a second substrate 400 and a common electrode 500. The display medium 300, the color filter conductive structure 200, the common electrode 500 and the second substrate 400 are disposed along the normal (i.e., the first direction D1) of the first substrate 100.

[0022] In detail, a display medium 300 is disposed on top of a first substrate 100. A color filter conductive structure 200 is disposed on top of the display medium 300. A common electrode 500 is disposed on top of the color filter conductive structure 200. A second substrate 400 is disposed on top of the common electrode 500, and the common electrode 500 is electrically connected to the color filter conductive structure 200. The stacked structure of the display device 10 shown in Figure 2 can be formed in various combinations of embodiments depending on the actual situation. In one embodiment, the display medium 300 can be formed on the first substrate 100, the color filter conductive structure 200 can be formed on the display medium 300, the common electrode 500 can be formed on the second substrate 400, and the second substrate 400 and the first substrate 100 can be disposed opposite to each other and bonded together. In another embodiment, a display medium 300 may be formed on a first substrate 100, a common electrode 500 may be formed on a second substrate 400, a color filter conductive structure 200 may be formed on the common electrode 500, and finally the second substrate 400 and the first substrate 100 may be disposed opposite to each other and bonded together. The formation method is not limited to this. Since the color filter conductive structure 200 is electrically connected to the common electrode 500, the electric field strength driving the display medium 300 can be maintained, avoiding poor optical performance due to a decrease in electric field strength, such as excessively low contrast, which would affect the display quality of the display device 10.

[0023] For example, the contrast ratio of a color display device with a general color filter pattern having a high sheet resistance disposed between the pixel electrode and the common electrode is about 26% to 31% lower than that of a monochrome display device without the aforementioned general color filter pattern. The contrast ratio of the display device 10 in this embodiment of the invention is about 22% to 27% lower than that of the aforementioned monochrome display device. Therefore, by electrically connecting the common electrode 500 to the color filter conductive structure 200, the present invention can effectively reduce the contrast ratio drop, thereby improving display quality.

[0024] Please refer to Figure 2. The color filter conductive structure 200 includes a conductive layer 202 and multiple color filter patterns 204. The conductive layer 202 is disposed on the display medium 300 and electrically connected to the common electrode 500. These color filter patterns 204 may be formed on the conductive layer 202 or on the common electrode 500, and are located between the conductive layer 202 and the common electrode 500.

[0025] In some embodiments, the conductive layer 202 may include a transparent conductive layer, the material of which may include a transparent conductive material, such as a conductive polymer, indium tin oxide, zinc oxide, indium zinc oxide, carbon nanotubes, silver nanotubes, or a combination of the foregoing materials. The conductive layer 202 may directly contact the common electrode 500 to electrically connect the common electrode 500, or the conductive layer 202 and the common electrode 500 may be connected by a conductive adhesive (not shown) to electrically connect the conductive layer 202 to the common electrode 500.

[0026] It is worth noting that, for the sake of simplicity, Figure 2 only shows nine color filter patterns 204 as representative illustrations. However, it is understood that other color filter patterns 204 may be included in areas not shown in the figure. In some embodiments, the colors of these color filter patterns 204 may be red, green, and blue, respectively. The material of the color filter patterns 204 may include color resist.

[0027] In some embodiments, the first substrate 100 and the second substrate 400 are, for example, glass substrates, plastic substrates, silicon substrates, flexible substrates, or other suitable substrates. Alternatively, the first substrate 100 may be an array substrate, for example, comprising a plurality of pixel electrodes (not shown), a plurality of switching elements (not shown, such as transistors) or other electronic components (not shown, such as capacitors) electrically connected to these pixel electrodes, and these pixel electrodes may correspond to these color filter patterns 204 respectively. In detail, on the normal (i.e., the first direction D1) of the first substrate 100, these pixel electrodes overlap with these color filter patterns 204 respectively.

[0028] In some embodiments, the materials of the common electrode 500 and the pixel electrode may include opaque conductive materials, transparent conductive materials, or combinations thereof. The opaque conductive materials may be metals, such as molybdenum, or metal compounds, such as molybdenum nitride, molybdenum niobate, etc., while the transparent conductive materials may be, for example, indium tin oxide, indium zinc oxide, etc.

[0029] In some embodiments, the sheet resistance of the conductive layer 202 is approximately less than 1 MΩ / □, and the sheet resistance of the color filter pattern 204 is approximately not less than 1 GΩ / □. That is, the sheet resistance of the conductive layer 202 is on the order of approximately KΩ / □, while the sheet resistance of the color filter pattern 204 is on the order of approximately GΩ / □. Although the sheet resistance of the color filter pattern 204 is still relatively high, since the color filter pattern 204 is located between the conductive layer 202 with lower sheet resistance and the common electrode 500, and the conductive layer 202 is electrically connected to the common electrode 500, even if the sheet resistance of the color filter pattern 204 is high, it is not easy to cause a decrease in the electric field strength of the driving display medium 300. Therefore, it is possible to avoid a situation where poor optical performance, such as excessively low contrast, is caused by a decrease in electric field strength, which would affect the display quality of the display device 10.

[0030] In some embodiments, the display medium 300 may be an electrophoretic display layer, but the present invention is not limited thereto. In other embodiments, the display medium 300 may be a liquid crystal display layer, an electrowetting display layer, a liquid powder display layer, etc.

[0031] Figure 3 is a partial cross-sectional schematic diagram of the display area AA of the display device 10A according to at least one embodiment of the present invention. Referring to Figure 3, the embodiment in Figure 3 shares most of the same component structure, materials, and relative positional relationships with the embodiment in Figure 2. Furthermore, the top view of the display device 10A in Figure 3 is substantially the same as the top view of the display device 10A in Figure 2; therefore, the same technical features will not be described or illustrated here. The main difference between the two embodiments is that the conductive layer 202A of the display device 10A includes a plurality of mutually separated conductive patterns CP, with gaps d between these conductive patterns CP, and these gaps d separate the conductive patterns CP from each other. In some embodiments, these conductive patterns CP can serve as touch electrodes, but the present invention is not limited thereto.

[0032] Figure 4 is a partial cross-sectional schematic diagram of the display area AA of the display device 10B according to at least one embodiment of the present invention. Referring to Figure 4, the embodiment in Figure 4 shares most of the same component structure, materials, and relative positional relationships with the embodiment in Figure 2. Furthermore, the top view of the display device 10B in Figure 4 is substantially the same as the top view of the display device 10B in Figure 2; therefore, the same technical features will not be described or illustrated here. The main difference between the two embodiments is that the color filter conductive structure 200 of the display device 10B includes multiple color filter conductive patterns 204B.

[0033] In detail, these color-filtering conductive patterns 204B can be formed on the display medium 300 or on the common electrode 500, and directly contact the common electrode 500 for electrical connection. Similarly, a plurality of pixel electrodes of the first substrate 100 can respectively correspond to these color-filtering conductive patterns 204B. That is, on the normal (i.e., the first direction D1) of the first substrate 100, these pixel electrodes respectively overlap with these color-filtering conductive patterns 204B.

[0034] In some embodiments, the material of these color filter conductive patterns 204B may include dyes and conductive polymers, carbon nanotubes, nanosilver, or mixtures of the aforementioned materials. The sheet resistance of these color filter conductive patterns 204B is approximately less than 1 MΩ / □, that is, the sheet resistance of these color filter conductive patterns 204B is on the order of approximately KΩ / □. Because the sheet resistance of the color filter conductive patterns 204B is low and they are electrically connected to the common electrode 500, even if the color filter conductive patterns 204B are disposed between the pixel electrode and the common electrode 500, it is not easy to cause a decrease in the electric field strength of the driving display medium 300. Therefore, it is possible to avoid situations where poor optical performance, such as excessively low contrast, is caused by a decrease in electric field strength, thus affecting the display quality of the display device 10B.

[0035] In summary, the present invention uses a color filter conductive structure to electrically connect a common electrode, thereby maintaining the electric field strength of the driving display medium and avoiding poor optical performance, such as low contrast, caused by a decrease in electric field strength, which would affect the display quality of the display device.

[0036] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

[0037] 10, 10A, 10B: Display devices 100: First substrate 200: Color filter conductive structure 202, 202A: Conductive layer 204: Color Filter Pattern 204B: Color-filtered conductive pattern 300: Display medium 400: Second substrate 500: Common Electrode CP: Conductive pattern d: gap AA: Display area D1: First Direction PA: Surrounding Area

[0038] Domestic storage information (please note in order of storage institution, date, and number) none Overseas storage information (please note in the order of storage country, institution, date, and number) none

Claims

1. A display device, comprising: First substrate; A display medium is disposed on the first substrate; A second substrate is disposed opposite to the first substrate; A common electrode is disposed on the second substrate; and a color filter conductive structure is disposed between the display medium and the common electrode and is electrically connected to the common electrode.

2. The display device as claimed in claim 1, wherein the color filter conductive structure comprises: A conductive layer is disposed on the display medium and electrically connected to the common electrode; and a plurality of color filter patterns are formed on the conductive layer and located between the conductive layer and the common electrode.

3. The display device as claimed in claim 2, wherein the conductive layer includes a transparent conductive layer.

4. The display device as claimed in claim 3, wherein the material of the transparent conductive layer includes a conductive polymer, indium tin oxide, zinc oxide, indium zinc oxide, carbon nanotubes, silver nanotubes, or a combination of the foregoing materials.

5. The display device as claimed in claim 2, wherein the first substrate includes a plurality of pixel electrodes, each pixel electrode corresponding to a color filter pattern.

6. The display device as claimed in claim 2, wherein the sheet resistance of the conductive layer is less than 1 MΩ / □.

7. The display device as claimed in claim 2, wherein the sheet resistance of the color filter patterns is not less than 1 GΩ / □.

8. The display device as claimed in claim 2, wherein the conductive layer comprises a plurality of conductive patterns that are separated from each other.

9. The display device as claimed in claim 1, wherein the color filter conductive structure includes a plurality of color filter conductive patterns, the color filter conductive patterns being in direct contact with the common electrode to electrically connect the common electrode.

10. The display device as claimed in claim 9, wherein the sheet resistance of the color filter conductive patterns is less than 1 MΩ / □.

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