Reflective display device and method of manufacturing a reflective display device

Abstract

The application discloses a reflective display device and a preparation method thereof, and relates to the technical field of display, wherein the reflective display device comprises a first substrate and a second substrate arranged oppositely, and at least two pixel areas are defined between the first substrate and the second substrate; the reflective display device further comprises cholesteric liquid crystals and fluorescent powders; the cholesteric liquid crystals comprise at least two kinds, the at least two kinds of cholesteric liquid crystals are arranged in the same layer and are respectively arranged in the at least two pixel areas; the fluorescent powders comprise at least two kinds, the at least two kinds of fluorescent powders can emit light of different colors and are respectively scattered in the at least two kinds of cholesteric liquid crystals arranged in the same layer. The reflective display device provided by the application can monitor whether the coating positions of the cholesteric liquid crystals reflecting different colors are in the suitable areas in the processing process.

Description

Technical Field

[0001] This invention relates to the field of reflective display technology, and particularly to a reflective display device and a method for manufacturing the reflective display device. Background Technology

[0002] Cholesteric liquid crystals (CLCs) have become a core component of color electronic paper due to their bistable, high reflectivity, and low power consumption characteristics, and because they can reflect different wavelengths through different chiral agents. However, since the color of the light reflected by CLCs is usually determined by their pitch, it is difficult to distinguish between different CLCs reflecting different colors in electronic paper under natural power-off conditions. This makes it difficult to monitor whether the coating positions of the CLCs reflecting different colors are within the appropriate areas during the manufacturing process. Summary of the Invention

[0003] The main objective of this invention is to provide a reflective display device and a method for manufacturing the reflective display device, aiming to improve the problem that it is difficult to monitor whether the coating position of the cholesteric liquid crystals reflecting each color is within the appropriate area during the processing of traditional reflective display devices.

[0004] To achieve the above objectives, the present invention proposes a display device comprising a first substrate and a second substrate disposed opposite to each other, wherein at least two pixel regions are defined between the first substrate and the second substrate; the reflective display device further comprises cholesteric liquid crystal and phosphor, wherein the cholesteric liquid crystal comprises at least two types, wherein the at least two types of cholesteric liquid crystal are disposed in the same layer and respectively disposed in the at least two pixel regions; wherein the phosphor comprises at least two types, wherein the at least two types of phosphor can emit light of different colors and are respectively dispersed in the at least two types of cholesteric liquid crystal disposed in the same layer.

[0005] In one embodiment, the cholesteric liquid crystal includes a first cholesteric liquid crystal for reflecting red light, a second cholesteric liquid crystal for reflecting green light, and a third cholesteric liquid crystal for reflecting blue light; the phosphor includes red phosphor, green phosphor, and blue phosphor; the red phosphor is dispersed in the first cholesteric liquid crystal, the green phosphor is dispersed in the second cholesteric liquid crystal, and the blue phosphor is dispersed in the third cholesteric liquid crystal.

[0006] In one embodiment, the excitation wavelength of the phosphor does not overlap with the wavelength of the reflection spectrum of the cholesterol liquid crystal.

[0007] In one embodiment, the reflective display device further includes a support partition sandwiched between the first substrate and the second substrate, and separating at least two pixel regions.

[0008] In one embodiment, the projection of the support partition on the first substrate is a grid, and each grid on the support partition corresponds to a pixel area.

[0009] In one embodiment, the phosphor in the cholesterol liquid crystal has a weight percentage of not less than 0.1 wt% and not more than 0.5 wt%.

[0010] The present invention also proposes a method for fabricating the above-mentioned reflective display device, the method comprising:

[0011] The first substrate, at least two types of the cholesterol liquid crystals, and at least two types of phosphors are prepared; wherein the at least two types of phosphors are respectively dispersed into the at least two types of the cholesterol liquid crystals;

[0012] The cholesterol liquid crystal containing the phosphor is injected into the pixel region;

[0013] The phosphor is excited to emit light;

[0014] Obtain the actual coating area of ​​each of the aforementioned cholesterol liquid crystals;

[0015] The actual coating areas of the various cholesterol liquid crystals are compared with the preset coating areas of the various cholesterol liquid crystals, and comparison results are generated.

[0016] In one embodiment, the reflective display device further includes a support partition for separating at least two of the pixel regions;

[0017] The step of injecting the cholesteric liquid crystal mixed with the phosphor into the pixel region further includes:

[0018] The support partition is fabricated on the first substrate.

[0019] In one embodiment, the step of comparing the actual coating areas of various cholesterol liquid crystals with the preset coating areas of various cholesterol liquid crystals and generating comparison results includes:

[0020] The actual coating area of ​​the various cholesterol liquid crystals obtained is consistent with the preset coating area of ​​the various cholesterol liquid crystals.

[0021] The second substrate is prepared and disposed on the side of the cholesterol liquid crystal away from the first substrate.

[0022] In one embodiment, the cholesteric liquid crystal further contains a curing agent; prior to the step of preparing the second substrate and disposing of the second substrate on the side of the cholesteric liquid crystal opposite to the first substrate, the method further includes:

[0023] The cholesterol liquid crystal is cured.

[0024] The reflective display device of the present invention includes a first substrate and a second substrate disposed opposite to each other, with at least two pixel regions defined between the first substrate and the second substrate. At least two types of cholesteric liquid crystals are co-layered and respectively disposed within the at least two pixel regions, enabling the reflective display device to display at least two colors, thereby achieving a color effect. Furthermore, the co-layered arrangement of at least two types of cholesteric liquid crystals can shorten the distance between the first substrate and the second substrate, thereby reducing the thickness of the reflective display device and achieving a thinner and lighter design. By providing at least two types of phosphors, and dispersing them within the at least two types of cholesteric liquid crystals co-layered, the reflective display device, during manufacturing, can achieve a fluorescent marking effect by exciting the phosphors to emit light after coating the cholesteric liquid crystals with dispersed phosphors. This allows for the determination of the coating area of ​​the cholesteric liquid crystals, enabling monitoring during processing to ensure that the coating position of the cholesteric liquid crystals is within the appropriate area, thus guaranteeing high coating precision. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of a reflective display device according to Embodiment 1 of the present invention;

[0027] Figure 2 A top view of the support partition in the reflective display device according to Embodiment 1 of the present invention;

[0028] Figure 3 A schematic flowchart illustrating an example of a method for fabricating a reflective display device according to Embodiment 2 of the present invention;

[0029] Figure 4 A schematic flowchart illustrating another example of the fabrication method of the reflective display device according to Embodiment 2 of the present invention;

[0030] Figure 5 A schematic flowchart illustrating yet another example of the method for fabricating a reflective display device according to Embodiment 2 of the present invention;

[0031] Figure 6This is a schematic flowchart illustrating yet another example of the method for fabricating a reflective display device according to Embodiment 2 of the present invention.

[0032] Explanation of icon numbers:

[0033] 100. First substrate;

[0034] 200. Second substrate;

[0035] 300, Cholesterol Liquid Crystal; 301, First Cholesterol Liquid Crystal; 302, Second Cholesterol Liquid Crystal; 303, Third Cholesterol Liquid Crystal;

[0036] 400. Phosphor; 401. Red phosphor; 402. Green phosphor; 403. Blue phosphor;

[0037] 500, Supporting partition; 501, Grid.

[0038] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0041] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0042] Cholesteric liquid crystals (CLCs) have become a core component of color electronic paper due to their bistable nature, high reflectivity, and low power consumption, as well as their ability to reflect different wavelengths using different chiral agents. Traditional CLC color electronic paper uses three independent CLC cells to achieve color display. Each cell is responsible for a primary color (usually red, green, and blue). By adjusting the optical properties of these three cells, various colors can be mixed to achieve the desired color display effect. This approach requires six substrate layers, resulting in high costs and significantly limiting the adoption of CLC cells in reflective display devices. However, if CLCs reflecting red, green, and blue primary colors are printed onto different pixels on the same layer, full-color display can be achieved by utilizing the helical structure changes of CLC molecules under an electric field, greatly reducing production costs. However, in this process, all three CLCs are transparent or milky white when not charged, making it difficult to distinguish between them visually. This makes it challenging to monitor whether the coating positions of the CLCs reflecting each color are within the appropriate areas during processing.

[0043] Example 1:

[0044] To address the problem of traditional reflective display devices where it is difficult to monitor whether the coating position of each color of cholesteric liquid crystal is within the appropriate area during the manufacturing process, this invention proposes a display device.

[0045] like Figure 1As shown, in one embodiment of the present invention, the reflective display device includes a first substrate 100 and a second substrate 200 disposed opposite to each other, with at least two pixel regions defined between the first substrate 100 and the second substrate 200; the reflective display device also includes cholesteric liquid crystal 300 and phosphor 400, the cholesteric liquid crystal 300 includes at least two types, the at least two types of cholesteric liquid crystal 300 are disposed in the same layer and respectively disposed in at least two pixel regions; the phosphor 400 includes at least two types, the at least two types of phosphor 400 can emit light of different colors and are respectively dispersed in the at least two types of cholesteric liquid crystal 300 disposed in the same layer.

[0046] The first substrate 100 can be a thin-film transistor array glass substrate or a ceramic substrate, etc. Similarly, the second substrate 200 can be a thin-film transistor array glass substrate or a ceramic substrate, etc. The first substrate 100 and the second substrate 200 are positioned opposite each other, meaning that the first substrate 100 and the second substrate 200 are spaced apart, and a larger surface of the first substrate 100 faces a larger surface of the second substrate 200. The first substrate 100 defines at least two pixel areas, allowing different images to be displayed through these at least two pixel areas, such as displaying different colors or different pictures.

[0047] The reflective display device also includes cholesteric liquid crystal 300. Cholesteric liquid crystal 300 does not contain actual cholesterol, but its molecular structure is similar to cholesterol. The molecules of cholesteric liquid crystal 300 are arranged in a helical shape, and the period of the helical structure is called the pitch. By changing the pitch, the reflection of different wavelengths of light by cholesteric liquid crystal 300 can be controlled, thereby achieving color display. It should be noted that the reflective display device may also include a first alignment layer disposed between the first substrate 100 and the cholesteric liquid crystal 300, a first transparent electrode layer disposed between the first alignment layer and the first substrate 100, a second alignment layer disposed between the second substrate 200 and the cholesteric liquid crystal 300, a second transparent electrode layer disposed between the second alignment layer and the second substrate 200, and an absorption layer, etc. Since the structure and principle of traditional reflective display devices are common knowledge to those skilled in the art, they will not be described in detail here. Unlike traditional reflective display devices, the reflective display device of this invention includes at least two types of cholesteric liquid crystals 300, specifically, at least two types of cholesteric liquid crystals 300 with different pitches. This allows it to reflect light of different wavelengths. Therefore, when the at least two types of cholesteric liquid crystals 300 with different pitches reflect natural light, the reflective display device can display at least two different colors, thereby achieving the effect of displaying a color image. Specifically, "the reflective display device includes at least two types of cholesteric liquid crystals 300" can mean that the reflective display device includes two types of cholesteric liquid crystals 300, or it can mean that the reflective display device includes three types of cholesteric liquid crystals 300, or even more types of cholesteric liquid crystals 300. For example, when a reflective display device includes two types of cholesteric liquid crystals 300, these two types of cholesteric liquid crystals 300 can be cholesteric liquid crystals 300 that reflect red light and cholesteric liquid crystals 300 that reflect green light, respectively; when a reflective display device includes three types of cholesteric liquid crystals 300, these three types of cholesteric liquid crystals 300 can be cholesteric liquid crystals 300 that reflect red light, cholesteric liquid crystals 300 that reflect green light, and cholesteric liquid crystals 300 that reflect blue light, respectively; when a reflective display device includes four types of cholesteric liquid crystals 300, these four types of cholesteric liquid crystals 300 can be cholesteric liquid crystals 300 that reflect red light, cholesteric liquid crystals 300 that reflect green light, cholesteric liquid crystals 300 that reflect blue light, and cholesteric liquid crystals 300 that reflect yellow light, respectively. Cholesteric liquid crystals 300 have bistable display characteristics, meaning that the displayed image can remain stable in the absence of an external electric field. Therefore, the reflective display device of this application has good energy-saving effects.

[0048] By having at least two types of cholesteric liquid crystals 300 disposed in the same layer and respectively disposed in at least two pixel areas, the size of the reflective display device in the direction from the first substrate 100 to the second substrate 200 can be reduced, thereby reducing the distance between the first substrate 100 and the second substrate 200 and achieving the effect of reducing the thickness of the reflective display device.

[0049] The reflective display device also includes at least two types of phosphors 400, which are dispersed within at least two types of cholesteric liquid crystals 300. Different phosphors 400 emit different colors when excited. Therefore, the coating area of ​​the cholesteric liquid crystals 300 can be monitored by the colors displayed by the phosphors 400. The coating precision can then be readjusted based on the monitoring results, reducing the risk of overlap between different types of cholesteric liquid crystals 300 and thus reducing the risk of color bleeding in the displayed image. Specifically, the reflective display device includes two, three, or more types of phosphors 400. For example, when there are three types of cholesteric liquid crystals 300, two types of phosphors 400 can be used, dispersed within two different cholesteric liquid crystals 300 to display two colors when excited. This allows monitoring of the coating areas of the two cholesteric liquid crystals 300, improving the coating precision and reducing the risk of color bleeding in the displayed image. Of course, it is understandable that when there are two types of cholesteric liquid crystal 300, two types of phosphor 400 can be used to display two colors in the excited state; when there are three types of cholesteric liquid crystal 300, three types of phosphor 400 can be used to display three colors in the excited state; when there are four types of cholesteric liquid crystal 300, four types of phosphor 400 can be used to display three colors in the excited state, and so on. With this configuration, the coating areas of different types of cholesteric liquid crystal 300 can be monitored separately by using phosphor 400 of different colors, thereby ensuring that the coating area of ​​each type of cholesteric liquid crystal 300 is within the appropriate range. It should be noted that the color of the light reflected by the cholesteric liquid crystal 300 can be the same as or different from the color of the light emitted by the phosphor 400 after excitation. Since the cholesteric liquid crystal 300 is in a flowable state during the coating stage, when dispersing the phosphor 400 within the cholesteric liquid crystal 300, the process can be carried out by stirring with a stirring rod or by ultrasonic mixing. The process of dispersing phosphor 400 within cholesteric liquid crystal 300 can be performed before or after coating cholesteric liquid crystal 300. Phosphor 400 can be a conventional phosphor 400 or a quantum dot phosphor 400, etc. It should be noted that both conventional phosphor 400 and quantum dot phosphor 400 are well known to those skilled in the art, and therefore will not be described in detail.

[0050] In actual production, a first type of cholesteric liquid crystal 300 with phosphor 400 dispersed in it can be coated onto the corresponding pixel area. Then, a light source that can excite the phosphor 400 to emit light is turned on, so that the light emitted by the light source shines on the corresponding cholesteric liquid crystal 300, thereby causing the phosphor 400 dispersed in the cholesteric liquid crystal 300 to emit light. The area where the phosphor 400 emits light is used to determine the coating area of ​​this type of cholesteric liquid crystal 300. If the actual coating area matches the preset coating area, a second type of cholesteric liquid crystal 300 with phosphor 400 dispersed in it is coated. The above steps of turning on the light source that can excite the phosphor 400 to emit light and letting the light emitted by the light source shine on the corresponding cholesteric liquid crystal 300 are repeated. Then, the actual coating area of ​​the second type of cholesteric liquid crystal 300 matches the preset coating area is determined by the area where the phosphor 400 emits light. Alternatively, in actual production, all types of cholesteric liquid crystals 300 containing phosphor 400 can be coated into their respective pixel areas first. Then, a light source that excites the phosphor 400 to emit light is turned on, ensuring that the emitted light covers all types of cholesteric liquid crystals 300. The actual coating area of ​​each cholesteric liquid crystal 300 can then be determined by observing the areas where the phosphor 400 emits light, to see if it matches the preset coating area. This matching can be done manually or by using an image sensor to acquire images and send the image signals to an analysis unit for analysis.

[0051] The reflective display device of the present invention includes a first substrate 100 and a second substrate 200 disposed opposite to each other, with at least two pixel regions defined between the first substrate 100 and the second substrate 200. At least two types of cholesteric liquid crystals 300 are disposed on the same layer and respectively disposed in the at least two pixel regions, thereby enabling the reflective display device to display at least two colors, thus displaying a color effect. In addition, the co-layering of at least two types of cholesteric liquid crystals 300 can also shorten the distance between the first substrate 100 and the second substrate 200, thereby reducing the thickness of the reflective display device and achieving a thinner and lighter effect. By setting at least two types of phosphors 400, and distributing the at least two types of cholesteric liquid crystals 300 in the same layer, the reflective display device can achieve the effect of fluorescent marking by exciting the phosphors 400 to emit light after coating the cholesteric liquid crystals 300 with phosphors 400 during the manufacturing process. This allows for the determination of the coating area of ​​the cholesteric liquid crystals 300, enabling the monitoring of whether the coating position of the cholesteric liquid crystals 300 is within the appropriate area during the manufacturing process, and ensuring that the cholesteric liquid crystals 300 have high coating accuracy.

[0052] like Figure 1As shown, in one example of the present invention, the cholesteric liquid crystal 300 includes a first cholesteric liquid crystal 301 for reflecting red light, a second cholesteric liquid crystal 302 for reflecting green light, and a third cholesteric liquid crystal 303 for reflecting blue light; the phosphor 400 includes a red phosphor 401, a green phosphor 402, and a blue phosphor 403; the red phosphor 401 is dispersed in the first cholesteric liquid crystal 301, the green phosphor 402 is dispersed in the second cholesteric liquid crystal 302, and the blue phosphor 403 is dispersed in the third cholesteric liquid crystal 303.

[0053] By setting a first cholesterol liquid crystal 301 that reflects red light, a second cholesterol liquid crystal 302 that reflects green light, and a third cholesterol liquid crystal 303 that reflects blue light, the colors displayed by the reflective display device are richer, and the effect of displaying a full-color image can be achieved.

[0054] By using red phosphor 401, green phosphor 402, and blue phosphor 403, the three phosphors 400 can be dispersed in different cholesteric liquid crystals 300, allowing for monitoring of the coating areas of all three cholesteric liquid crystals 300. This enables real-time adjustment of the coating position and improves the coating accuracy of each cholesteric liquid crystal 300. Furthermore, by dispersing red phosphor 401 in the first cholesteric liquid crystal 301, green phosphor 402 in the second cholesteric liquid crystal 302, and blue phosphor 403 in the third cholesteric liquid crystal 303, the color of the light emitted by the phosphors 400 matches the color of the light reflected by the corresponding cholesteric liquid crystal 300. This facilitates monitoring the coating accuracy of cholesteric liquid crystals 300 reflecting the same color light. Additionally, this configuration prevents color bleeding during normal display even if the excitation wavelength of the phosphors 400 overlaps with the reflection spectrum of the cholesteric liquid crystal 300.

[0055] In one example of the present invention, the excitation wavelength of the phosphor 400 does not overlap with the wavelength of the reflection spectrum of the cholesterol liquid crystal 300.

[0056] Specifically, the reflected light of the cholesteric liquid crystal 300 comes from natural light, and the wavelength of its reflected spectrum is red light with a range of 620 nm to 750 nm, while the excitation wavelength of the phosphor 400 can be ultraviolet light at 365 nm or blue light at 465 nm, etc. Alternatively, the wavelength of the reflected spectrum of the cholesteric liquid crystal 300 is green light with a range of 492 nm to 455 nm, while the excitation wavelength of the phosphor 400 can be ultraviolet light at 365 nm, etc.

[0057] By setting the excitation wavelength of phosphor 400 to not overlap with the wavelength of the reflection spectrum of cholesteric liquid crystal, phosphor 400 will not emit light when the reflective display device is displaying the image normally. This ensures that the fluorescence signal when detecting the cholesteric liquid crystal 300 coated area can be independent of the liquid crystal display characteristics, thus reducing the risk of phosphor 400 interfering with the real image.

[0058] Please refer to the reference. Figure 1 and Figure 2 In one example of the present invention, the reflective display device further includes a support partition 500 for separating at least two pixel areas.

[0059] Specifically, there may be one, two, or more support partitions 500. When there is one support partition 500, it can be a flat plate, a grid 501, or a Z-shaped structure, etc. One support partition 500 can separate only two pixel areas, or it can separate more pixel areas. When there are two or more support partitions 500, they can also be flat plate, grid 501, or Z-shaped structures, thereby separating more pixel areas.

[0060] The support partition 500 can be formed when disposed between the first substrate 100 and the second substrate 200. For example, the support partition 500 can be made of photoresist, which is coated on the side of the first substrate 100 facing the second substrate 200, and various groove or hole structures are formed by exposure and development processes, thereby facilitating the injection of cholesteric liquid crystal 300 into the grooves or holes. Of course, the support partition 500 can also be pre-formed before being disposed between the first substrate 100 and the second substrate 200.

[0061] By providing a support partition 500 between the first substrate 100 and the second substrate 200, and by separating at least two pixel areas, the risk of crosstalk between the cholesteric liquid crystals 300 in the two pixel areas can be reduced, thereby improving the display quality of the reflective display device.

[0062] like Figure 2 As shown, in one example of the present invention, the projection of the support partition 500 on the first substrate 100 is a grid, and each grid 501 on the support partition 500 corresponds to a pixel area.

[0063] Specifically, the shape of the grid 501 of the supporting partition 500 on the first substrate 100 can be circular, rectangular or other shapes.

[0064] By setting the projection of the support partition 500 on the first substrate 100 into a grid pattern, with each grid 501 corresponding to a pixel area, when cholesteric liquid crystal 300 is injected into each grid 501, the edges of the grid 501 of the support partition 500 can form a blocking effect on the cholesteric liquid crystal 300. Furthermore, this configuration allows the support partition 500 to form multiple grids 501 at once using photolithography, resulting in a simple and efficient molding process.

[0065] In one example of the present invention, the phosphor 400 has a weight percentage of not less than 0.1 wt% and not more than 0.5 wt% in the cholesteric liquid crystal 300.

[0066] Specifically, the weight percentage of phosphor 400 in the cholesteric liquid crystal 300 refers to the weight of phosphor 400 divided by (weight of phosphor 400 + weight of cholesteric liquid crystal 300). This weight percentage can be 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, or 0.5wt%. If the weight percentage of phosphor 400 in the cholesteric liquid crystal 300 is less than 0.1wt%, the proportion of phosphor 400 in the cholesteric liquid crystal 300 is small, making it difficult to form a significant color display effect. If the weight percentage of phosphor 400 in the cholesteric liquid crystal 300 is greater than 0.5wt%, it can easily affect the pitch of the cholesteric liquid crystal 300, thus making it difficult to guarantee the stability of the reflected light from the cholesteric liquid crystal 300.

[0067] By setting the weight percentage of phosphor 400 in cholesteric liquid crystal 300 to be no less than 0.1 wt% and no more than 0.5 wt%, the luminous intensity of phosphor 400 is guaranteed without affecting the helical structure stability of cholesteric liquid crystal 300, thus enabling cholesteric liquid crystal 300 to maintain its bistable characteristics.

[0068] In one example of the present invention, a curing agent is also mixed into the cholesterol liquid crystal 300.

[0069] Specifically, the curing agent may include, but is not limited to, epoxy resin-acrylate composite systems, isocyanate-containing acrylates, etc.

[0070] By also mixing a curing agent into the cholesteric liquid crystal 300, after the cholesteric liquid crystal 300 is coated onto the corresponding pixel area, it can be cured by ultraviolet light irradiation or heating, thereby reducing the risk of cholesteric liquid crystal 300 flow and color mixing. Furthermore, this arrangement ensures that when the second substrate 200 is placed over the side of the cholesteric liquid crystal 300 facing away from the first substrate 100, the cholesteric liquid crystal 300 is not affected by pressure, thus making it less prone to changing the pitch of the cholesteric liquid crystal 300. This results in more stable color display of the image displayed by the reflective display device of the present invention.

[0071] Example 2:

[0072] This invention also proposes a method for manufacturing a reflective display device. The specific structure of this reflective display device is as described in the above embodiments. Since this reflective display device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. Figure 3 As shown, the method for manufacturing the reflective display device of the present invention includes:

[0073] S10: Prepare the first substrate 100, at least two types of cholesteric liquid crystals 300, and at least two types of phosphors 400; wherein, the at least two types of phosphors 400 are respectively dispersed into the at least two types of cholesteric liquid crystals 300;

[0074] S30: Inject the cholesteric liquid crystal 300 in which the phosphor 400 is dispersed into the pixel area;

[0075] S50: Excites the phosphor 400 to emit light;

[0076] S70: Obtain the actual coating area of ​​each of the cholesterol liquid crystals 300;

[0077] S90: Compare the actual coating areas of the various cholesterol liquid crystals 300 with the preset coating areas of the various cholesterol liquid crystals 300, and generate comparison results.

[0078] The first substrate 100 can be a thin-film transistor array glass substrate or a ceramic substrate, etc. At least two types of cholesteric liquid crystal 300 specifically refer to at least two types of cholesteric liquid crystal 300 with different pitches. These different pitches can be achieved by changing temperature, pressure, electric field, etc. At least two types of phosphors 400 mean that at least two phosphors 400 can emit different colors when excited. For example, when two phosphors 400 are used, these two phosphors 400 can display two of the following colors respectively in the excited state: red, green, blue, yellow, etc.; when three phosphors 400 are used, the three phosphors 400 can display three of the following colors respectively in the excited state: red, green, blue, yellow, etc. When the phosphors 400 are dispersed within the cholesteric liquid crystal 300, they can be stirred by a stirring rod or by ultrasound, etc. The process of mixing phosphors 400 into the cholesteric liquid crystal 300 can be performed before or after the process of injecting cholesteric liquid crystal 300 into the pixel area.

[0079] When the phosphor 400 is excited to emit light, it can be excited by a light source set on the monitoring equipment, or by a light source independent of the detection equipment. It is understood that once the phosphor 400 is excited to emit light, the area of ​​the cholesteric liquid crystal 300 can be determined based on the area of ​​light emitted by the phosphor 400. Therefore, the phosphor 400 effectively provides a fluorescent marker for determining the coating area of ​​the cholesteric liquid crystal 300, allowing monitoring personnel or equipment to obtain the actual coating area of ​​the cholesteric liquid crystal 300. Specifically, the actual coating area of ​​the cholesteric liquid crystal 300 can be obtained through photography or by sensing the fluorescence position using a photosensor, or other methods.

[0080] The steps of injecting the cholesteric liquid crystal 300 containing the phosphor 400 into the pixel area and stimulating the phosphor 400 to emit light, thereby obtaining the actual coating areas of various cholesteric liquid crystals 300, can be performed sequentially or alternately. For example, when the steps of injecting the cholesteric liquid crystal 300 containing the phosphor 400 into the pixel area and stimulating the phosphor 400 to emit light, thereby obtaining the actual coating areas of various cholesteric liquid crystals 300, are performed sequentially, all types of cholesteric liquid crystals 300 containing phosphor 400 can be coated into their respective pixel areas first. Then, the light source that can stimulate the phosphor 400 to emit light is turned on, so that the light emitted by the light source can cover all types of cholesteric liquid crystals 300. Then, the actual coating areas of various cholesteric liquid crystals 300 can be determined by the areas where the phosphor 400 emits light, to see if they meet the requirements of the preset coating areas. When the steps described above—injecting the phosphor 400 into the pixel area into the cholesteric liquid crystal 300 and exciting the phosphor 400 to emit light, thus obtaining the actual coating areas of various cholesteric liquid crystals 300—are alternately repeated, the first type of cholesteric liquid crystal 300 with phosphor 400 can be coated into the corresponding pixel area first. Then, by turning on a light source capable of exciting the phosphor 400 to emit light, the light emitted by the light source shines onto the corresponding cholesteric liquid crystal 300, thereby causing the phosphor 400 dispersed within the cholesteric liquid crystal 300 to emit light. The area emitting phosphor 400 is used to obtain the coating area of ​​the cholesteric liquid crystal 300. If the actual coating area matches the preset coating area, the second type of cholesteric liquid crystal 300 with phosphor 400 dispersed is coated. The above steps of turning on the light source that can excite the phosphor 400 to emit light and illuminating the corresponding cholesteric liquid crystal 300 to excite the phosphor 400 to emit light are repeated. Then, the actual coating area of ​​the second type of cholesteric liquid crystal 300 is obtained through the phosphor 400 emitting area, and it is determined whether the actual coating area of ​​the second type of cholesteric liquid crystal 300 matches the preset coating area. When coating different types of cholesteric liquid crystal 300, when monitoring the coating area of ​​each type of cholesteric liquid crystal 300, a corresponding filter can be set on the acquisition module for acquiring the actual coating area of ​​the cholesteric liquid crystal 300. For example, when acquiring the actual coating area of ​​a cholesteric liquid crystal 300 with dispersed red phosphor 401, a red light filter can be used; when acquiring the actual coating area of ​​a cholesteric liquid crystal 300 with dispersed green phosphor 402, a green light filter can be used; and when acquiring the actual coating area of ​​a cholesteric liquid crystal 300 with dispersed blue phosphor 403, a blue light filter can be used, etc. This setting can improve the accuracy of acquiring the actual coating area of ​​each type of cholesteric liquid crystal 300, thereby improving the detection accuracy.

[0081] In this invention, by injecting cholesteric liquid crystal 300 containing dispersed phosphor 400 into the pixel area, and then exciting the phosphor 400 to emit light, the cholesteric liquid crystal 300 is fluorescently marked. The area where the phosphor 400 emits light is the coating area of ​​the cholesteric liquid crystal 300 mixed with the phosphor 400. Therefore, the coating position of the cholesteric liquid crystal 300 can be monitored in real time during the fabrication of the reflective display device. By obtaining the actual coating areas of various cholesteric liquid crystals 300, and then comparing the obtained actual coating areas of various cholesteric liquid crystals 300 with the preset coating areas of various cholesteric liquid crystals 300, and generating comparison results, the coating position of the cholesteric liquid crystal 300 can be adjusted in real time according to the actual coating area. This achieves the effect of monitoring the coating accuracy of the cholesteric liquid crystal 300 during processing, thereby reducing the manufacturing defect rate.

[0082] like Figure 4 As shown, in one example of the present invention, the reflective display device further includes a support partition 500 for separating at least two pixel regions; before step S30: injecting the cholesteric liquid crystal 300 in which the phosphor 400 is dispersed into the pixel region, the method further includes:

[0083] S20: The support partition 500 is prepared on the first substrate 100.

[0084] There may be one, two, or more support partitions 500. When there is one support partition 500, it can be a flat plate, a grid 501, or a Z-shaped structure. One support partition 500 can separate only two pixel areas, or it can separate more pixel areas. When there are two or more support partitions 500, they can also be flat plate, grid 501, or Z-shaped structures, thereby separating more pixel areas. Furthermore, the projection of the support partition 500 onto the first substrate 100 is a grid 501, and each grid 501 on the support partition 500 corresponds to one pixel area, thereby achieving the effect of material blocking at the edges of more pixel areas.

[0085] By fabricating a support partition 500 on the first substrate 100, and by separating at least two pixel regions, the support partition 500 can effectively block the cholesteric liquid crystal 300 when it is subsequently injected into the pixel region, thereby reducing the flow of the cholesteric liquid crystal 300 outside its corresponding pixel region and improving the coating accuracy of the cholesteric liquid crystal 300.

[0086] like Figure 5 As shown, in one example of the present invention, step S90, which involves comparing the actual coating areas of various cholesterol liquid crystals 300 with the preset coating areas of various cholesterol liquid crystals 300 and generating a comparison result, includes the following:

[0087] S91: It is detected that the actual coating area of ​​the various cholesterol liquid crystals 300 is consistent with the preset coating area of ​​the various cholesterol liquid crystals 300.

[0088] S93: Prepare the second substrate 200 and place the second substrate 200 on the side of the cholesteric liquid crystal 300 away from the first substrate 100.

[0089] This configuration ensures that the area coated with cholesteric liquid crystal 300 is within a suitable preset range before the second substrate 200 is added, thereby guaranteeing the fabrication yield during the fabrication process of the reflective display device.

[0090] In one example of the present invention, after step S90: comparing the actual coating areas of various cholesterol liquid crystals 300 with the preset coating areas of various cholesterol liquid crystals 300 and generating comparison results, the method further includes:

[0091] The actual coating area of ​​the various cholesterol liquid crystals 300 obtained is consistent with the preset coating area of ​​the various cholesterol liquid crystals 300.

[0092] The coating area of ​​the cholesterol liquid crystal 300 was readjusted.

[0093] When readjusting the coating area of ​​the cholesteric liquid crystal 300, it can be achieved by touch-up coating or recoating. This setup allows for real-time adjustment of the cholesteric liquid crystal 300 coating position during processing, preventing high defect rates after product molding.

[0094] like Figure 6 As shown, in one example of the present invention, the cholesteric liquid crystal 300 is further mixed with a curing agent; before step S93: preparing the second substrate 200 and disposing the second substrate 200 on the side of the cholesteric liquid crystal 300 opposite to the first substrate 100, the method further includes:

[0095] S92: Curing the cholesterol liquid crystal 300.

[0096] Specifically, the curing agent may include, but is not limited to, epoxy resin-acrylate composite systems, isocyanate-containing acrylates, etc.

[0097] By mixing a curing agent into the cholesteric liquid crystal 300, when the comparison result shows that the actual coating area obtained after the cholesteric liquid crystal 300 is coated onto the corresponding pixel area matches the preset coating area, the cholesteric liquid crystal 300 mixed with the curing agent can be cured by ultraviolet light irradiation or heating, thereby reducing the risk of cholesteric liquid crystal 300 flow and color mixing. Furthermore, this arrangement ensures that after the second substrate 200 is placed on the side of the cholesteric liquid crystal 300 away from the first substrate 100, the cholesteric liquid crystal 300 is not affected by pressure, thus making it less prone to changing the pitch of the cholesteric liquid crystal 300. This results in more stable color display of the image displayed by the reflective display device of the present invention.

[0098] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A reflective display device, comprising a first substrate and a second substrate disposed opposite to each other, characterized in that, At least two pixel regions are defined between the first substrate and the second substrate; the reflective display device further includes: At least two types of cholesteric liquid crystals, wherein the at least two types of cholesteric liquid crystals are disposed in the same layer and respectively disposed in at least two pixel regions; and The phosphor is provided in at least two types, and the at least two types of phosphor can emit light of different colors and are respectively dispersed in the at least two types of cholesterol liquid crystals arranged in the same layer. The phosphors emitting different colors of light respectively monitor the coating areas of the two types of cholesterol liquid crystals. The excitation wavelength of the phosphor does not overlap with the wavelength of the reflection spectrum of the cholesterol liquid crystal, so that the phosphor does not emit light when the reflective display device is displaying the image normally. The cholesterol liquid crystal also contains a curing agent, which includes an epoxy resin-acrylate composite system, isocyanate or acrylate, so that the cholesterol liquid crystal is cured after being coated onto the corresponding pixel area.

2. The reflective display device as described in claim 1, characterized in that, The cholesterol liquid crystal includes a first cholesterol liquid crystal for reflecting red light, a second cholesterol liquid crystal for reflecting green light, and a third cholesterol liquid crystal for reflecting blue light. The phosphors include red phosphors, green phosphors, and blue phosphors; the red phosphors are dispersed in the first cholesterol liquid crystal, the green phosphors are dispersed in the second cholesterol liquid crystal, and the blue phosphors are dispersed in the third cholesterol liquid crystal.

3. The reflective display device as described in claim 1, characterized in that, The reflective display device further includes a support partition, which is sandwiched between the first substrate and the second substrate and separates at least two pixel areas.

4. The reflective display device as described in claim 3, characterized in that, The projection of the supporting partition on the first substrate is a grid, and each grid on the supporting partition corresponds to a pixel area.

5. The reflective display device according to any one of claims 1 to 4, characterized in that, The phosphor in the cholesterol liquid crystal has a weight percentage of not less than 0.1 wt% and not more than 0.5 wt%.

6. A method for manufacturing a reflective display device according to any one of claims 1 to 5, characterized in that, The method for manufacturing the reflective display device includes: The first substrate, at least two types of the cholesterol liquid crystals, and at least two types of phosphors are prepared; wherein the at least two types of phosphors are respectively dispersed into the at least two types of the cholesterol liquid crystals; The cholesterol liquid crystal containing the phosphor is injected into the pixel region; The phosphor is excited to emit light; Obtain the actual coating area of ​​each of the aforementioned cholesterol liquid crystals; The actual coating areas of various cholesterol liquid crystals are compared with the preset coating areas of various cholesterol liquid crystals, and comparison results are generated. The actual coating area of ​​the various cholesterol liquid crystals obtained is consistent with the preset coating area of ​​the various cholesterol liquid crystals. The cholesterol liquid crystal is cured; The second substrate is prepared and disposed on the side of the cholesterol liquid crystal away from the first substrate.

7. The method for manufacturing a reflective display device as described in claim 6, characterized in that, The reflective display device further includes a support partition for separating at least two of the pixel areas; The step of injecting the cholesteric liquid crystal mixed with the phosphor into the pixel region further includes: The support partition is fabricated on the first substrate.

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