Reflective display panel

Abstract

This invention provides a reflective display panel comprising a pixel structure, a filter pattern, a chromaticity compensation pattern, and a liquid crystal layer. The pixel structure has a first reflective pattern and a second reflective pattern. The filter pattern overlaps with the second reflective pattern but not with the first reflective pattern. The chromaticity compensation pattern does not overlap with the second reflective pattern. The reflective display panel is adapted to reflect a first light beam and a second light beam from the outside. The first reflective pattern is located on the transmission path of the first light beam. The chromaticity compensation pattern and the filter pattern are not on the transmission path of the first light beam. The liquid crystal layer and the chromaticity compensation pattern are located on the transmission path of the second light beam. The filter pattern is not on the transmission path of the second light beam. The color of the first light beam emanating from the reflective display panel is different from the color of the second light beam and the color of the filter pattern. The color of the mixture of the first and second light beams has chromaticity coordinates (x, y) in the CIE1931 color space within the range of (0.300±0.05, 0.330±0.05).

Description

Technical Field

[0001] This invention relates to a display panel, and more particularly to a reflective display panel. Background Technology

[0002] Thin-film transistor liquid crystal display (TFT-LCD) panels can generally be divided into three main categories: transmissive, reflective, and transflective-reflective. This classification is based on the light source used and the differences in the thin-film transistor array substrate (TFT array). Reflective TFT-LCD panels primarily utilize natural or ambient light as their light source. Because they do not require backlighting, they possess excellent energy-saving characteristics. Therefore, they are commonly used outdoors or in well-lit environments, such as advertising billboards, electronic tags, and sports watches. These display applications often use light-colored backgrounds (such as white) to highlight the advertising or promotional information. However, the rendering of such backgrounds is prone to color distortion due to the structural design of reflective LCD panels. Summary of the Invention

[0003] This invention relates to a reflective display panel with better white balance for displaying colors.

[0004] According to an embodiment of the present invention, a reflective display panel includes a pixel array substrate, a light-transmitting substrate, a light-filtering pattern, a chromaticity compensation pattern, and a liquid crystal layer. The pixel array substrate has pixel structures. Each pixel structure has a first reflective pattern and a second reflective pattern. The light-transmitting substrate and the pixel array substrate are disposed opposite each other. The light-filtering pattern overlaps with the second reflective pattern but does not overlap with the first reflective pattern. The chromaticity compensation pattern does not overlap with the second reflective pattern. The projected area of ​​the chromaticity compensation pattern on the light-transmitting substrate is smaller than the projected area of ​​the first reflective pattern on the light-transmitting substrate. The liquid crystal layer is disposed between the pixel array substrate and the light-transmitting substrate. The reflective display panel is adapted to reflect a first light beam and a second light beam from the outside. The liquid crystal layer and the first reflective pattern are located on the transmission path of the first light beam. The chromaticity compensation pattern and the light-filtering pattern are not on the transmission path of the first light beam. The liquid crystal layer and the chromaticity compensation pattern are located on the transmission path of the second light beam. The light-filtering pattern is not on the transmission path of the second light beam. The color of the first light beam emanating from the reflective display panel is different from the color of the second light beam emanating from the reflective display panel and the color of the light-filtering pattern. The color resulting from the mixing of the first and second beams has chromaticity coordinates (x, y) in the CIE 1931 color space within the range of (0.300±0.05, 0.330±0.05).

[0005] In a reflective display panel according to an embodiment of the present invention, the orthogonal projection area of ​​the first reflective pattern on the light-transmitting substrate is greater than the orthogonal projection area of ​​the second reflective pattern on the light-transmitting substrate.

[0006] In a reflective display panel according to an embodiment of the present invention, the ratio of the positive projection area of ​​the first reflective pattern on the light-transmitting substrate to the positive projection area of ​​the second reflective pattern on the light-transmitting substrate is between 1.3 and 1.8.

[0007] In a reflective display panel according to an embodiment of the present invention, the orthogonal projection area of ​​the chromaticity compensation pattern on the light-transmitting substrate is smaller than the orthogonal projection area of ​​the second reflective pattern on the light-transmitting substrate.

[0008] In a reflective display panel according to an embodiment of the present invention, the chromaticity compensation pattern completely overlaps with the first reflective pattern, and the first reflective pattern is located on the transmission path of the second light beam.

[0009] In a reflective display panel according to an embodiment of the present invention, the percentage of the orthographic projection area of ​​the chromaticity compensation pattern on the first reflective pattern to the reflective area of ​​the first reflective pattern is between 10% and 50%.

[0010] In the reflective display panel according to an embodiment of the present invention, the pixel structure further has a third reflective pattern disposed on the transmission path of the second light beam. The chromaticity compensation pattern overlaps the third reflective pattern but does not overlap the first reflective pattern and the second reflective pattern.

[0011] In a reflective display panel according to an embodiment of the present invention, the pixel structure further includes a first active element electrically connected to a first reflective pattern, a second active element electrically connected to a second reflective pattern, and a third active element electrically connected to a third reflective pattern, wherein the first reflective pattern, the second reflective pattern, and the third reflective pattern are reflective pixel electrodes.

[0012] In the reflective display panel according to an embodiment of the present invention, the filter pattern is a red color resist, and the chromaticity compensation pattern is a blue color resist.

[0013] In a reflective display panel according to an embodiment of the present invention, the pixel structure further includes a first active element electrically connected to a first reflective pattern and a second active element electrically connected to a second reflective pattern, wherein the first reflective pattern and the second reflective pattern are reflective pixel electrodes.

[0014] Based on the above, in a reflective display panel according to an embodiment of the present invention, a chromaticity compensation pattern is used to adjust the color of a portion of the external light beams reflected by the first reflective pattern, so that the color after mixing all the external light beams that have not passed through the filter pattern and are reflected by the first reflective pattern can have a white-balanced chromaticity. Attached Figure Description

[0015] The accompanying drawings are included to further illustrate the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0016] Figure 1 This is a top view schematic diagram of a reflective display panel according to an embodiment of the present invention;

[0017] Figure 2 yes Figure 1 A cross-sectional schematic diagram of a reflective display panel;

[0018] Figure 3 This is a top view schematic diagram of a reflective display panel according to another embodiment of the present invention;

[0019] Figure 4 yes Figure 3 A cross-sectional view of the reflective display panel.

[0020] Explanation of reference numerals in the attached figures

[0021] 10, 20: Reflective display panels;

[0022] 100, 100A: Pixel array substrate;

[0023] 105: Substrate;

[0024] 110: Insulation layer;

[0025] 120: Passivation layer;

[0026] 140, 210: Overlying layer;

[0027] 182, 182A: First reflection pattern;

[0028] 184: Second reflection pattern;

[0029] 186: Third reflection pattern;

[0030] 205: Transparent substrate;

[0031] 250: Filter pattern;

[0032] 255, 255A: Color compensation patterns;

[0033] CL1: First conductive layer;

[0034] CL2: Second conductive layer;

[0035] CL3: Third conductive layer;

[0036] DL1: First data line;

[0037] DL2: Second data line;

[0038] DL3: Third data line;

[0039] GL: Scan line;

[0040] LB1: First beam;

[0041] LB2: Second beam;

[0042] PA: Pixel area;

[0043] PX, PX-A: Pixel structure;

[0044] T1: First active element;

[0045] T2: Second active element;

[0046] T3: Third active element;

[0047] X, Y, Z: Direction. Detailed Implementation

[0048] In the accompanying drawings, the thicknesses of layers, films, panels, regions, etc., are enlarged for clarity. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected" to another element, it may be directly on or connected to the other element, or intermediate elements may also be present. Conversely, when an element is referred to as being "directly on" or "directly connected" to another element, no intermediate elements are present. As used herein, "connection" can refer to a physical and / or electrical connection. Furthermore, an "electrical connection" may mean the presence of other elements between two elements.

[0049] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same element references are used in the drawings and description to denote the same or similar parts.

[0050] Figure 1 This is a top view schematic diagram of a reflective display panel according to an embodiment of the present invention. Figure 2 yes Figure 1 A cross-sectional view of the reflective display panel. It should be noted that, for clarity, Figure 1 Only show Figure 2 The pixel array substrate 100 includes a portion of the film layer, the filter pattern 250, and the color compensation pattern 255. Please refer to... Figure 1 and Figure 2The reflective display panel 10 includes a pixel array substrate 100, a light-transmitting substrate 205, and a liquid crystal layer 300. The light-transmitting substrate 205 is disposed opposite to the pixel array substrate 100. The liquid crystal layer 300 is disposed between the pixel array substrate 100 and the light-transmitting substrate 205. The material of the light-transmitting substrate 205 is, for example, glass, quartz, a polymer (e.g., polyimide, polycarbonate, polyethylene terephthalate, or polymethyl methacrylate), or other suitable light-transmitting materials.

[0051] The pixel array substrate 100 includes, for example, a substrate 105 and a driving array layer. The driving array layer is disposed between the substrate 105 and the liquid crystal layer 300, and is provided with various signal lines and active elements. For example, in this embodiment, the driving array layer may include multiple first data lines DL1, multiple second data lines DL2, and multiple scan lines GL. These first data lines DL1 and second data lines DL2 are arranged alternately along direction X, for example, while these scan lines GL are arranged along direction Y, for example, where direction X may be perpendicular to direction Y, but is not limited thereto.

[0052] In this embodiment, multiple first data lines DL1 and multiple scan lines GL can generally define multiple pixel regions PA, and each pixel region PA is provided with multiple pixel structures PX. Pixel structure PX includes, for example, a first reflective pattern 182, a second reflective pattern 184, a first active element T1, and a second active element T2. The first active element T1 is electrically connected to a first data line DL1, a scan line GL, and the first reflective pattern 182. The second active element T2 is electrically connected to a second data line DL2, a scan line GL, and the second reflective pattern 184.

[0053] For example, the scan line GL can be made of the first conductive layer CL1, while the first data line DL1 and the second data line DL2 can be made of the second conductive layer CL2, wherein an insulating layer 110 is provided between the first conductive layer CL1 and the second conductive layer CL2. On the other hand, these conductive layers can also be used to form the gate (not shown), source (not shown), and drain (not shown) of the aforementioned active elements. For example, the gates of the first active element T1 and the second active element T2 can each be made of the first conductive layer CL1, while their sources and drains can be made of the second conductive layer CL2, but this is not a limitation. For conductivity considerations, the first conductive layer CL1 and the second conductive layer CL2 are generally made of metallic materials (e.g., molybdenum, aluminum, copper, nickel, chromium, the aforementioned alloys, or the aforementioned stacked structures). The material of the insulating layer 110 includes silicon nitride (SiNx), silicon oxide (SiOx), or other suitable dielectric materials.

[0054] To increase the design margin or process considerations of the driving array layer, a third conductive layer CL3 may optionally be provided on the second conductive layer CL2, wherein a passivation layer 120 is provided between the third conductive layer CL3 and the second conductive layer CL2, and a coating layer 140 is provided between the third conductive layer CL3 and the first reflective pattern 182 and the second reflective pattern 184. For example, the third conductive layer CL3 can be used to form the capacitor electrode of the storage capacitor of the pixel circuit, or the interposer layer of other circuit elements. However, the present invention is not limited thereto. In other embodiments, the pixel array substrate may not have a third conductive layer CL3.

[0055] The material of the third conductive layer CL3 may include metal oxides (e.g., indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, or other suitable oxides, or a stacked structure of at least two of the above) or metals (e.g., molybdenum, aluminum, copper, nickel, chromium, alloys of the above, or stacked structures of the above). The material of the passivation layer 120 may include amorphous silicon, silicon oxide, silicon nitride, aluminum oxide (Al2O3), or titanium dioxide (TiO2). The material of the coating layer 140 may include inorganic materials (e.g., silicon oxide, silicon nitride, silicon oxynitride, other suitable materials, or a stacked layer of at least two of the above materials), organic materials (e.g., polyesters, polyolefins, polyacrylonitriles, polycarbonates, polyoxyalkylene compounds, polystyrene, polyethers, polyketides, polyols, polyaldehydes, or other suitable materials, or combinations thereof), or other suitable materials, or combinations thereof.

[0056] The first reflective pattern 182 and the second reflective pattern 184 are disposed on the cladding layer 140 and are used to reflect ambient light beams or illumination beams from a front light source, for example... Figure 2 The first beam LB1 and the second beam LB2 are in the image. Therefore, the first reflection pattern 182 and the second reflection pattern 184 are made of, for example, a metallic material with high reflectivity (e.g., aluminum, silver, or copper).

[0057] On the other hand, the first reflective pattern 182 and the second reflective pattern 184 can also simultaneously serve as reflective pixel electrodes driving the liquid crystal layer 300. Since each reflective pattern is electrically connected to a corresponding active element (e.g., the first active element T1 or the second active element T2), the driving potential of these reflective patterns can be individually controlled to generate an electric field that drives the corresponding plurality of liquid crystal molecules (not shown) to rotate. These liquid crystal molecules can form different alignment states under the action of electric fields of different magnitudes, thereby modulating the polarization state of the light beam after passing through the liquid crystal layer 300. After the light beam with this changed polarization state passes through a polarizer (not shown) disposed on the light-transmitting substrate 205, its light intensity will exhibit a corresponding change, such as enhancement or weakening. For example, in order to generate an electric field distribution that is substantially perpendicular to the light-transmitting substrate 205, a light-transmitting electrode (not shown) may also be optionally disposed on the light-transmitting substrate 205, and the electric field driving the liquid crystal molecules is generated by the potential difference between the light-transmitting electrode and the reflective pattern, but this is not a limitation. In other embodiments, the aforementioned light-transmitting electrode may be replaced by another reflective pattern, and disposed on the same side of the liquid crystal layer 300 as the aforementioned reflective pattern.

[0058] Furthermore, the reflective display panel 10 also includes a light-filtering pattern 250 and a color-compensation pattern 255. In this embodiment, the light-filtering pattern 250 and the color-compensation pattern 255 may be disposed on the light-transmitting substrate 205 and covered with a cladding layer 210. However, the present invention is not limited thereto. In other embodiments, the cladding layer 210 may not be provided. In a direction perpendicular to the substrate 105 (e.g., direction Z), the light-filtering pattern 250 overlaps with the second reflective pattern 184 but does not overlap with the first reflective pattern 182. That is, the light-filtering pattern 250 is disposed only corresponding to the second reflective pattern 184. For example, in this embodiment, the light-filtering pattern 250 is, for example, a red color resist, and the color-compensation pattern 255 is, for example, a blue color resist, but this is not a limitation.

[0059] More specifically, the first reflective pattern 182 is used to reflect external light beams (e.g., natural light or white light) that have not passed through any filter pattern 250, and the color of the filter pattern 250 is different from the color of the external light beam. When only the first reflective pattern 182 can reflect the external light beam, its corresponding pixel area PA can be used to display the background color of the image (e.g., white). When only the second reflective pattern 184 can reflect the external light beam, the pixel area PA can be used to display a predetermined color other than the background color (e.g., red). When both reflective patterns can reflect the external light beam, the display area PA can display the predetermined color at different shades. Whether the reflective pattern can reflect the external light beam is achieved, for example, through the polarization state modulation of the external light beam by the liquid crystal layer 300 and the setting of the absorption axis of the aforementioned polarizer, but the present invention is not limited thereto.

[0060] In this embodiment, the orthographic projection area of ​​the first reflective pattern 182 on the light-transmitting substrate 205 can be larger than the orthographic projection area of ​​the second reflective pattern 184 on the light-transmitting substrate 205, and the ratio between the two can be between 1.3 and 1.8. That is, there is a larger area used to display the background color within each pixel area PA, and through the above-mentioned ratio setting, the reflective display panel 10 can achieve the best visual effect. In addition, the orthographic projection area of ​​the chromaticity compensation pattern 255 on the light-transmitting substrate 205 is smaller than the orthographic projection area of ​​the second reflective pattern 184 on the light-transmitting substrate 205.

[0061] In this embodiment, the chromaticity compensation pattern 255 may optionally completely overlap the first reflection pattern 182 in the Z direction, but not overlap the second reflection pattern 184. Preferably, the percentage of the orthographic projection area of ​​the chromaticity compensation pattern 255 on the first reflection pattern 182 to the reflective area of ​​the first reflection pattern 182 may be between 10% and 50%.

[0062] Please refer to Figure 2 Both the first light beam LB1 and the second light beam LB2, originating from the external environment or a front light source, are adapted to be reflected by the first reflective pattern 182. More specifically, the liquid crystal layer 300 and the first reflective pattern 182 are located in the transmission path of the first light beam LB1, while the filter pattern 250 and the chromaticity compensation pattern 255 are not in the transmission path of the first light beam LB1. The chromaticity compensation pattern 255, the liquid crystal layer 300, and the first reflective pattern 182 are located in the transmission path of the second light beam LB2, while the filter pattern 250 is not in the transmission path of the second light beam LB2.

[0063] It should be noted that the color of the first light beam LB1 emitted from the reflective display panel 10 is different from the color of the second light beam LB2 emitted from the reflective display panel 10 and the color of the filter pattern 250. For example, the first light beam LB1 has a yellowish-white color after exiting the reflective display panel 10 via the aforementioned transmission path, and the second light beam LB2 has a different shade of blue after exiting the reflective display panel 10 via the aforementioned transmission path. Therefore, the mixed color of the first light beam LB1 and the second light beam LB2 emitted from the reflective display panel 10 can be a white with high color purity, for example, a white whose chromaticity coordinates (x, y) in the CIE 1931 color space are in the range of (0.300±0.05, 0.330±0.05).

[0064] More specifically, the present invention utilizes a chromaticity compensation pattern 255 to give the passing second light beam LB2 a color that compensates for the color shift of the first light beam LB1. In another embodiment, the color of the first light beam LB1, reflected by the first reflection pattern 182 and emitted from the reflective display panel, can also be a white with a greenish tint, a white with a bluish tint, or a color shift of other colors. Accordingly, the chromaticity compensation pattern 255 can be used to give the passing second light beam LB2 different shades of red, yellow, or complementary colors that compensate for other color shifts, thereby achieving a white balance effect in the mixed color of all external light beams reflected by the first reflection pattern 182.

[0065] Figure 3 This is a top view schematic diagram of a reflective display panel according to another embodiment of the present invention. Figure 4 yes Figure 3 A cross-sectional view of the reflective display panel. Please refer to... Figure 3 and Figure 4 The reflective display panel 20 in this embodiment and Figure 1 The main difference between the reflective display panel 10 and the other one is that the color compensation pattern is set differently. Specifically, in this embodiment, the number of reflective patterns and active elements in the pixel structure PX-A are both three, for example: first reflective pattern 182A, second reflective pattern 184, third reflective pattern 186, first active element T1, second active element T2 and third active element T3.

[0066] Accordingly, the pixel array substrate 100A of this embodiment may also include multiple third data lines DL3, wherein the first active element T1 is electrically connected to a first data line DL1, a scan line GL and a first reflection pattern 182A, the second active element T2 is electrically connected to a second data line DL2, a scan line GL and a second reflection pattern 184, and the third active element T3 is electrically connected to a third data line DL3, a scan line GL and a third reflection pattern 186.

[0067] Compared to Figure 1 The pixel structure PX in this embodiment further includes a third reflection pattern 186 between the first reflection pattern 182A and the second reflection pattern 184. Notably, in this embodiment, the chromaticity compensation pattern 255A overlaps with the third reflection pattern 186 in the Z direction, but does not overlap with the first reflection pattern 182A or the second reflection pattern 184. The chromaticity compensation pattern 255A and the third reflection pattern 186 are positioned along the transmission path of the second beam LB2.

[0068] For example, when only the first reflective pattern 182A and the third reflective pattern 186 can reflect external light beams, their corresponding pixel areas PA can be used to display the background color of the image (e.g., white). When only the second reflective pattern 184 can reflect external light beams, the pixel area PA can be used to display a predetermined color other than the background color (e.g., red). When all three reflective patterns can reflect external light beams, the display area PA can display the predetermined color at different shades.

[0069] It is particularly noteworthy that when only the third reflective pattern 186 can reflect the external light beam, its corresponding pixel area PA can be used to display colors other than the background color (e.g., white) and the color of the filter pattern 250 (e.g., red) (e.g., blue). That is to say, in this embodiment, the chromaticity compensation pattern 255A can not only be used to compensate for the color shift of the first light beam LB1 after exiting the reflective display panel 20, but can also be used independently for displaying specific colors, which helps to improve the color performance of the reflective display panel 20.

[0070] Since the other components and their functions in this embodiment are similar to Figure 1 The reflective display panel 10 is described in detail in the relevant paragraphs of the foregoing embodiments, and will not be repeated here.

[0071] In summary, in a reflective display panel according to an embodiment of the present invention, the chromaticity compensation pattern is used to adjust the color of a portion of the external light beams reflected by the first reflective pattern, so that the color of all external light beams mixed by the first reflective pattern but not through the filter pattern can have a white-balanced chromaticity.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reflective display panel, characterized in that, include: A pixel array substrate is provided with a pixel structure, wherein the pixel structure has a first reflective pattern and a second reflective pattern; A light-transmitting substrate is disposed opposite to the pixel array substrate, wherein the orthographic projection area of ​​the first reflective pattern on the light-transmitting substrate is greater than the orthographic projection area of ​​the second reflective pattern on the light-transmitting substrate, and the ratio of the orthographic projection area of ​​the first reflective pattern on the light-transmitting substrate to the orthographic projection area of ​​the second reflective pattern on the light-transmitting substrate is between 1.3 and 1.

8. The filter pattern overlaps the second reflective pattern but does not overlap the first reflective pattern; A chromaticity compensation pattern, wherein the chromaticity compensation pattern completely overlaps the first reflective pattern and does not overlap the second reflective pattern, wherein the orthographic projection area of ​​the chromaticity compensation pattern on the light-transmitting substrate is smaller than the orthographic projection area of ​​the first reflective pattern on the light-transmitting substrate, and the percentage value of the orthographic projection area of ​​the chromaticity compensation pattern on the first reflective pattern to the reflective area of ​​the first reflective pattern is between 10% and 50%. as well as A liquid crystal layer is disposed between the pixel array substrate and the light-transmitting substrate. The reflective display panel is adapted to reflect a first beam and a second beam from the outside. The liquid crystal layer and the first reflective pattern are located on the transmission path of the first beam, while the chromaticity compensation pattern and the filter pattern are not on the transmission path of the first beam. The liquid crystal layer, the first reflective pattern, and the chromaticity compensation pattern are located on the transmission path of the second beam, while the filter pattern is not on the transmission path of the second beam. The color of the first beam emanating from the reflective display panel is different from the color of the second beam emanating from the reflective display panel and the color of the filter pattern. The color of the first beam and the second beam after mixing is white and the chromaticity coordinates (x, y) in the CIE1931 color space are within the range of (0.300±0.05, 0.330±0.05).

2. The reflective display panel according to claim 1, characterized in that, The projected area of ​​the chromaticity compensation pattern on the light-transmitting substrate is smaller than the projected area of ​​the second reflective pattern on the light-transmitting substrate.

3. The reflective display panel according to claim 1, characterized in that, The filter pattern is a red color resist, and the chromaticity compensation pattern is a blue color resist.

4. The reflective display panel according to claim 1, characterized in that, The pixel structure also has a first active element electrically connected to the first reflective pattern and a second active element electrically connected to the second reflective pattern, wherein the first reflective pattern and the second reflective pattern are reflective pixel electrodes.

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