LCD handwriting tablet

Abstract

This application discloses a liquid crystal writing tablet, belonging to the field of display technology. The liquid crystal writing tablet includes a first substrate, a second substrate, and a liquid crystal layer located between the first and second substrates. Due to the raised structure in the first substrate, the liquid crystal writing tablet can mix external light into white light, and the second substrate has filter areas that allow different wavelengths of light from the mixed white light to pass through. Therefore, the types of colors displayed in different areas of the liquid crystal writing tablet can be set by different filter areas in the second substrate. In this way, the liquid crystal writing tablet can display a wider variety of colors, thereby effectively improving the display effect.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a liquid crystal handwriting tablet. Background Technology

[0002] A handwriting tablet is an electronic device used for writing and drawing. Among them, LCD handwriting tablets have the advantages of low power consumption and clear handwriting, and have gained a significant market share in recent years.

[0003] Typically, a liquid crystal writing tablet can include: a first substrate and a second substrate disposed opposite each other, and a liquid crystal layer located between the first substrate and the second substrate. When the liquid crystal molecules in the liquid crystal layer are subjected to external pressure, the liquid crystal molecules can change from a focal conical texture to a planar texture. This planar texture allows the liquid crystal molecules to reflect light of a certain wavelength (e.g., green light) from the incident ambient light, enabling the liquid crystal writing tablet to display green handwriting. Currently, to enrich the color range displayed by liquid crystal writing tablets, different areas of the tablet are usually filled with liquid crystal molecules that reflect different colors, thus allowing different areas of the tablet to display different colors.

[0004] However, the non-fixed arrangement of liquid crystal molecules in different areas of the LCD handwriting tablet results in a poor display effect. Summary of the Invention

[0005] This application provides a liquid crystal handwriting tablet. It solves the problem of poor display quality in existing liquid crystal handwriting tablets. The technical solution is as follows:

[0006] A liquid crystal writing tablet is provided, comprising: a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer located between the first substrate and the second substrate;

[0007] The liquid crystal layer comprises bistable liquid crystal molecules;

[0008] The first substrate includes: a first substrate, and a plurality of protrusion structures located on the side of the first substrate near the second substrate. The protrusion structures are used to adjust the arrangement direction of liquid crystal molecules in the liquid crystal layer so that liquid crystal molecules with different arrangement directions in the liquid crystal layer can reflect light of different wavelengths in the external light.

[0009] The second substrate includes: a flexible second substrate having at least one filtering region, wherein the orthographic projection of the filtering region on the first substrate overlaps with the orthographic projections of at least two of the protrusion structures on the first substrate.

[0010] Optionally, the second substrate further includes a color filter layer located on one side of the second substrate, the color filter layer including at least one color resist block corresponding to the at least one light filtering region, the area occupied by the color resist block on the second substrate being the corresponding light filtering region.

[0011] Optionally, the second substrate further includes: the second substrate having a plurality of the filter regions, and the second substrate further includes: a transparent filler layer located between any two adjacent color resist blocks.

[0012] Optionally, the second substrate has a plurality of the filtering regions, and the second substrate further includes an electrochromic layer located between any two adjacent color resist blocks, the electrochromic layer having a transparent state and a filtering state.

[0013] Optionally, the second substrate has a plurality of the filtering regions, and the second substrate further includes: an electrochromic layer located between any two adjacent color resist blocks, the electrochromic layer having a transparent state and a filtering state; the liquid crystal handwriting tablet further includes: a driving electrode layer and a common electrode layer located on both sides of the electrochromic layer.

[0014] The driving electrode layer includes a driving electrode located within the filtering region, and the portion of the electrochromic layer located within the filtering region is configured to perform a switching between the transparent state and the filtering state under the control of the driving electrode located within the filtering region and the common electrode layer.

[0015] Optionally, the electrochromic layer is located on the side of the second substrate closer to the first substrate, the driving electrode layer is located on the side of the electrochromic layer in the second substrate closer to the second substrate, and the common electrode layer is located on the side of the electrochromic layer in the second substrate away from the second substrate.

[0016] The first substrate further includes: a pixel electrode layer;

[0017] The common electrode layer, the liquid crystal layer, and the pixel electrode layer are used to form the erasure portion of the liquid crystal handwriting tablet; the common electrode layer, the electrochromic layer, and the driving electrode layer are used to form the color-changing portion of the liquid crystal handwriting tablet.

[0018] Optionally, the driving electrode layer is located on the side of the plurality of protrusions in the first substrate away from the first substrate, the electrochromic layer is located on the side of the second substrate close to the first substrate, and the common electrode layer is located on the side of the electrochromic layer in the second substrate close to the second substrate.

[0019] The common electrode layer, the liquid crystal layer, and the driving electrode layer are used to form the erasure portion of the liquid crystal handwriting tablet; the common electrode layer, the electrochromic layer, and the driving electrode layer are used to form the color-changing portion of the liquid crystal handwriting tablet.

[0020] Optionally, the second substrate has a plurality of the filter regions, the plurality of filter regions are arranged in an array, and the plurality of filter regions include filter regions of at least two colors;

[0021] In a row of filter regions, any two adjacent filter regions have different colors, and in a column of filter regions, any two adjacent filter regions have different colors.

[0022] Optionally, the second substrate has a plurality of the filtering regions, the plurality of filtering regions being divided into a plurality of strip-shaped filtering partitions, each of the filtering partitions including at least one of the filtering regions;

[0023] The plurality of filter regions include filter regions of at least two colors;

[0024] In this configuration, all filter regions within a filter partition have the same color, while any two adjacent filter partitions have different colors.

[0025] Optionally, in the plurality of strip-shaped filter zones, two adjacent filter zones or three adjacent filter zones are used to form a color mixing zone;

[0026] Specifically, for any two color mixing zones with different colors, the widths of at least one filter zone with the same color in the two color mixing zones are different.

[0027] Optionally, when two adjacent filter zones form a color mixing zone, the second substrate has: at least one color gradient zone composed of a plurality of color mixing zones, and filter zones of a first color and a second color located on both sides of the color gradient zone.

[0028] Wherein, the width of the filter partition of the first color is greater than the width of the filter partition of the same color as the first color in each of the color mixing partitions in the color gradient partition;

[0029] The width of the filter partition of the second color is greater than the width of the filter partition of the same color as the second color in each of the mixing partitions in the color gradient partition;

[0030] Along the direction from the filter partition of the first color to the filter partition of the second color, the width of the filter partition with the same color as the first color in each of the color gradient partitions gradually decreases, and the width of the filter partition with the same color as the second color in each of the color mixing partitions gradually increases.

[0031] Optionally, the first color and the second color are any two of red, green and blue.

[0032] Optionally, when three adjacent filter zones form a color mixing zone, the colors of the three filter zones within the color mixing zone are red, green, and blue, respectively.

[0033] Optionally, the shape of the filtering area is elongated or arc-shaped.

[0034] Optionally, the first substrate further includes: a plurality of pixel electrodes located on the side of the plurality of protrusions facing away from the first substrate, wherein the orthographic projection of the pixel electrodes on the first substrate overlaps with the orthographic projection of at least two of the protrusions on the first substrate.

[0035] Optionally, the maximum thickness of the protrusion structure ranges from 0.5 to 3 micrometers, the width of the protrusion structure ranges from 3 to 10 micrometers, and the maximum slope angle of the protrusion structure ranges from 5 degrees to 60 degrees.

[0036] Optionally, all of the plurality of protrusions are made of a transparent insulating material;

[0037] The first substrate further includes a light-absorbing layer located on the side of the first substrate opposite to the second substrate, the light-absorbing layer being used to absorb light of at least a portion of the wavelengths so that the liquid crystal writing tablet displays the background color.

[0038] The beneficial effects of the technical solutions provided in this application include at least the following:

[0039] A liquid crystal writing tablet includes a first substrate, a second substrate, and a liquid crystal layer located between the first and second substrates. Due to the raised structure in the first substrate, the liquid crystal writing tablet can mix ambient light into white light, and the second substrate has filter areas that allow different wavelengths of light from the mixed white light to pass through. Therefore, the types of colors displayed in different areas of the liquid crystal writing tablet can be set by different filter areas in the second substrate. In this way, the liquid crystal writing tablet can display a wider variety of colors, thereby effectively improving the display effect. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a structural diagram of a liquid crystal handwriting tablet provided by related technologies;

[0042] Figure 2 This is a schematic diagram of the structure of a liquid crystal handwriting tablet provided in an embodiment of this application;

[0043] Figure 3 This is a schematic diagram of the structure of a second substrate provided in an embodiment of this application;

[0044] Figure 4 This is a schematic diagram of another second substrate structure provided in an embodiment of this application;

[0045] Figure 5 This is a schematic diagram of the structure of another second substrate provided in the embodiments of this application;

[0046] Figure 6 This is a schematic diagram of another liquid crystal handwriting tablet provided in an embodiment of this application;

[0047] Figure 7 This is a top view of a driving electrode and a common electrode provided in an embodiment of this application;

[0048] Figure 8 This is a top view of another driving electrode and common electrode provided in an embodiment of this application;

[0049] Figure 9 This is a top view of another driving electrode and common electrode provided in the embodiments of this application;

[0050] Figure 10 This is a top view of another driving electrode and common electrode provided in the embodiments of this application;

[0051] Figure 11 This is a top view of a driving electrode provided in an embodiment of this application;

[0052] Figure 12 This is a schematic diagram of the structure of another liquid crystal handwriting tablet provided in the embodiments of this application;

[0053] Figure 13 This is a top view of a second substrate provided in an embodiment of this application;

[0054] Figure 14This is a top view of another second substrate provided in an embodiment of this application;

[0055] Figure 15 This is a top view of yet another second substrate provided in an embodiment of this application;

[0056] Figure 16 This is a top view of another second substrate provided in the embodiments of this application. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0058] Please refer to the relevant technologies. Figure 1 , Figure 1 This is a schematic diagram of a liquid crystal writing tablet provided by related technology. The liquid crystal writing tablet 00 may include: a first substrate 01 and a second substrate 02 disposed opposite to each other, and a liquid crystal layer 03 located between the two. The bistable liquid crystal molecules in the liquid crystal layer 03 are configured such that when the liquid crystal layer 03 in the liquid crystal writing tablet 00 is subjected to external pressure, the bistable liquid crystal molecules change from a focal conic texture to a planar texture. For example, when a user writes on the liquid crystal writing tablet 00 with a writing tool, the user can apply pressure to the liquid crystal writing tablet 00 with the writing tool, causing the bistable liquid crystal molecules in the pressure-affected area of ​​the liquid crystal writing tablet 00 to change from a focal conic texture to a planar texture. In this case, the planar textured bistable liquid crystal molecules can reflect light of a certain wavelength (e.g., green light) from the ambient light illuminating the liquid crystal writing tablet 00, so that the liquid crystal writing tablet 00 can display the corresponding handwriting.

[0059] To enrich the color range displayed on the LCD handwriting tablet, different areas of the LCD handwriting tablet 00 are filled with bistable liquid crystal molecules that reflect different wavelengths. Thus, when the LCD handwriting tablet 00 is subjected to external pressure, the planar bistable liquid crystal molecules in different areas of the LCD handwriting tablet 00 can reflect different wavelengths of light from the ambient light illuminating the LCD handwriting tablet 00, thereby enabling different areas of the LCD handwriting tablet 00 to display different colors.

[0060] However, because the arrangement of bistable liquid crystal molecules in different areas of the LCD handwriting tablet 00 is not fixed, the color distribution between different areas is not fixed, resulting in a poor color gradient effect of the LCD handwriting tablet 00, which in turn leads to a poor display effect of the LCD handwriting tablet 00.

[0061] Please refer to Figure 2 , Figure 2This is a schematic diagram of the structure of a liquid crystal handwriting tablet provided in an embodiment of this application. The liquid crystal handwriting tablet 000 may include: a first substrate 100 and a second substrate 200 disposed opposite to each other, and a liquid crystal layer 300 located between the first substrate 100 and the second substrate 200.

[0062] The liquid crystal layer 300 may include bistable liquid crystal molecules. Here, when the liquid crystal layer 300 in the liquid crystal writing tablet 000 is subjected to external pressure, the bistable liquid crystal molecules can transform into a planar textured state; when the liquid crystal layer 300 in the liquid crystal writing tablet 000 is subjected to an electric field, the planar texture transforms into a focal cone texture.

[0063] The first substrate 100 may include a first substrate 101 and a plurality of protrusions 102 located on the side of the first substrate 101 near the second substrate 200. The protrusions 102 are used to adjust the arrangement direction of the bistable liquid crystal molecules in the liquid crystal layer 300 so that the bistable liquid crystal molecules with different arrangement directions in the liquid crystal layer 300 can reflect light of different wavelengths in the external light. Here, when the liquid crystal layer 300 in the liquid crystal writing tablet 000 is subjected to external pressure, after the bistable liquid crystal molecules change to a planar textured state, the protrusions 102 change the helical axis direction of the bistable liquid crystal molecules in the region corresponding to the protrusions 102, thereby changing the arrangement direction of the bistable liquid crystal molecules in the region corresponding to the protrusions 102, and thus enabling the bistable liquid crystal molecules to reflect light of different wavelengths in the external light (e.g., red light, green light, and blue light). In this way, the liquid crystal writing tablet 000 can reflect light of different wavelengths from the outside world. That is, after the outside light passes through the raised structure 102, it can be mixed into white light, so that the liquid crystal writing tablet 000 can display white writing marks. For ease of description, the white light in the following embodiments refers to the white light reflected from the liquid crystal writing tablet 000 after passing through the raised structure 102 in the first substrate 100.

[0064] The second substrate 200 may include a flexible second substrate 201. For example, the material used to make the second substrate 201 may include polyethylene terephthalate (PET). The second substrate 200 has at least one light-filtering region 200a (not shown in the figure, but shown in Figure 2), whose orthographic projection on the first substrate 101 overlaps with the orthographic projections of at least two protrusions 102 on the first substrate 101. Thus, white light, formed by the mixing of external light after passing through the at least two protrusions 102, can pass through the corresponding light-filtering region 200a, enabling the liquid crystal writing tablet 000 to display multiple colors. Here, when the liquid crystal writing tablet 000 has one light-filtering region 200a, the light-filtering region 200a is provided across the entire surface, and the light-filtering region 200a corresponds to all the protrusions 102 in the first substrate 100. When the liquid crystal handwriting tablet 000 has multiple light-filtering areas 200a, each light-filtering area 200a corresponds to a portion of a plurality of protrusion structures 102 in the first substrate 100. In this way, the areas in the liquid crystal handwriting tablet 000 that correspond to the light-filtering areas 200a can display different colors.

[0065] In this configuration, the raised structure 102 in the first substrate 100 enables the liquid crystal writing tablet 000 to mix external light into white light, and a filter region 200a is provided in the second substrate 200. Therefore, the color displayed in different areas of the liquid crystal writing tablet 000 is determined by the filter region 200a in the second substrate 200. Thus, compared to the aforementioned related technologies, the liquid crystal writing tablet 000 in this application does not require filling with bistable liquid crystal molecules that reflect different wavelengths, and it avoids the problem of inconsistent color distribution between different areas of the liquid crystal writing tablet 000. Therefore, by using different filter regions 200a in the second substrate 200, this application allows the liquid crystal writing tablet 000 to display a wider variety of colors, thereby effectively improving the display effect of the liquid crystal writing tablet 000.

[0066] In summary, the liquid crystal writing tablet provided in this application includes: a first substrate, a second substrate, and a liquid crystal layer located between the first substrate and the second substrate. Due to the raised structure in the first substrate, the liquid crystal writing tablet can mix external light into white light, and the second substrate has a filter area that allows different wavelengths of light from the mixed white light to pass through. Therefore, the types of colors displayed in different areas of the liquid crystal writing tablet can be set by different filter areas in the second substrate. In this way, the liquid crystal writing tablet can display a wider variety of colors, thereby effectively improving the display effect of the liquid crystal writing tablet.

[0067] In this embodiment, the first substrate 100 of the liquid crystal handwriting tablet 000 may further include a pixel electrode layer 103. The pixel electrode layer 103 is located on the side of the plurality of protrusions 102 near the second substrate 200. The pixel electrode layer 103 has a plurality of pixel regions ( Figure 2 (Not shown in the image), a pixel electrode 1031 can be arranged in each pixel region. Here, the shape of the pixel electrode 1031 can be the same as the shape of the multiple protrusion structures 102. The second substrate 200 may also include: a common electrode ( Figure 2 (Not shown in the image). When it is necessary to erase the handwriting displayed on the liquid crystal writing pad 000, the liquid crystal writing pad 000 can apply a voltage to the pixel electrode 1031 in the area to be erased, so that a voltage difference can be formed between the pixel electrode 1031 and the common electrode in the area to be erased. This causes the bistable liquid crystal molecules in the area to be erased to rearrange under the action of the voltage difference, that is, the bistable liquid crystal molecules can change from a planar texture to a focal conical texture. In this way, the liquid crystal layer 300 in the focal conical texture state is approximately transparent, that is, the bistable liquid crystal molecules in the focal conical texture can transmit incoming external light, so that the liquid crystal writing pad 000 displays a background color with the same color as the first substrate 100, thereby realizing the erasure of the handwriting in the area to be erased.

[0068] It should be noted that, as Figure 2 As shown, a pixel electrode 1031 in the first substrate 100 corresponds to a plurality of protrusions 102, and the orthographic projection of the protrusion 102 on the first substrate 102 lies within the orthographic projection of the corresponding pixel electrode 1031 on the first substrate 100. Furthermore, the thickness of the protrusion 102 gradually decreases along the direction from the center region to the edge region. In this way, the protrusion 102 can change the helical axis direction of the bistable liquid crystal molecules in the region corresponding to the protrusion 102, changing the arrangement direction of the bistable liquid crystal molecules at that location. This allows the bistable liquid crystal molecules corresponding to the protrusion 102 to reflect light of different wavelengths from the external light source, thereby making the light reflected from the liquid crystal writing tablet 000 white light.

[0069] It should also be noted that the maximum thickness of the protrusion structure 102 in the first substrate 100 ranges from 0.5 to 3 micrometers, the width of the protrusion structure 102 ranges from 3 to 10 micrometers, and the maximum slope angle of the protrusion structure 102 ranges from 5 degrees to 60 degrees.

[0070] In the embodiments of this application, the structure of the second substrate 200 can be implemented in various ways. The embodiments of this application will illustrate the following two optional implementation methods:

[0071] For the first optional implementation method, please refer to... Figure 3 , Figure 3 This is a schematic diagram of the structure of a second substrate provided in an embodiment of this application. The second substrate 200 may further include a color filter layer 202 located on one side of the second substrate 201. For example, the color filter layer 202 may be located on one side of the second substrate 201 near the first substrate 100. The color filter layer 202 may include at least one color resist block 2021 corresponding to at least one light filtering region 200a, and the area occupied by the color resist block 2021 on the second substrate 200 is the corresponding light filtering region 200a. That is, the outer boundary of the orthographic projection of each color resist block 2021 on the second substrate 201 coincides with the outer boundary of the orthographic projection of the corresponding light filtering region 200a on the second substrate 201. Here, a color resist block 2021 of one color may be arranged in each light filtering region 200a. For example, the types of color resist blocks 2021 arranged in multiple light filtering regions 200a may include any one of the following colors: red color resist block 2021R, green color resist block 2021G, and blue color resist block 2021B. When the filter area 200a contains a red color resist block 2021R, the filter area 200a allows light of red wavelength to pass through. Thus, the handwriting on the LCD handwriting tablet 000 within the area corresponding to the filter area 200a will appear red.

[0072] It should be noted that when the handwriting in the area corresponding to the filter area 200a of the liquid crystal writing tablet 000 needs to display green, the portion of the first substrate 100 corresponding to the filter area 200a may not have the raised structure 102. In this case, the color displayed in the area corresponding to the filter area 200a of the liquid crystal writing tablet 000 is the color reflected by the bistable liquid crystal molecules in the liquid crystal writing tablet 000. Here, the bistable liquid crystal molecules filled in the liquid crystal layer 300 of the liquid crystal writing tablet 000 are capable of reflecting green wavelengths of light from the external light illuminating the liquid crystal writing tablet 000.

[0073] In this embodiment, the second substrate 200 has a plurality of filter regions 200a. The filter layer 202 also has a plurality of color resist blocks 2021 corresponding one-to-one with the plurality of filter regions 200a. In this case, there may or may not be a gap between any two adjacent color resist blocks 2021. When there is a gap between any two adjacent color resist blocks 2021, it is necessary to fill the gap with a structure of other materials. This embodiment will be illustrated with the following two aspects as examples.

[0074] Firstly, the second substrate 200 may further include a transparent filler layer 203 located between any two adjacent color resist blocks 201. Since some white light is filtered out by the color blocks 2021 after passing through them, the brightness of the light emitted from the display surface of the liquid crystal writing tablet 000 decreases. Here, the display surface of the liquid crystal writing tablet 000 refers to the side of the liquid crystal writing tablet 000 that displays different colored handwriting after being subjected to external pressure. When there is a gap between any two adjacent color resist blocks 201, and a transparent filler layer 203 is disposed in this gap, more light passes through the transparent filler layer 203, resulting in higher brightness of the light emitted from the display surface of the liquid crystal writing tablet 000. Thus, the liquid crystal writing tablet 000 can display a rich variety of colors while maintaining good display brightness. It should be noted that when the gap between any two adjacent color resist blocks 201 is small, more light passes through the color group block 2021, resulting in higher color saturation displayed by the LCD handwriting tablet 000. When the gap between any two adjacent color resist blocks 201 is large, more light passes through the transparent filling layer 203, resulting in higher brightness of the LCD handwriting tablet 000.

[0075] In this case, a transparent filler layer 203 can be formed on the second substrate 200 in a variety of ways. The embodiments of this application will be illustrated using the following two methods as examples.

[0076] The first method, such as Figure 3 As shown, after forming multiple color resist blocks 2021 on the second substrate 200 through a single patterning process, a transparent filler layer 203 is then formed between each color resist block 2021 through another patterning process. In this way, the thickness of the transparent filler layer 203 is the same as the thickness of the color resist block 2021.

[0077] For the second method, please refer to... Figure 4 , Figure 4 This is a schematic diagram of another second substrate structure provided in an embodiment of this application. After forming multiple color resist blocks 2021 on the second substrate 200 through a single patterning process, a full-length transparent filler layer 203 is formed on the second substrate 200 where the multiple color resist blocks 2021 have been formed. In this way, the thickness of the transparent filler layer 203 is greater than the thickness of the color resist blocks 2021, and the transparent filler layer 203 can perform planarization processing on the side of the color resist blocks 2021 facing away from the second substrate 201.

[0078] In both of the above methods, it is necessary to ensure good flatness on the side of the multiple color resist blocks 2021 on the second substrate 200 that faces away from the second substrate 201. This can improve the overall flatness of the second substrate 200, allowing the bistable liquid crystal molecules in the liquid crystal layer 300 that are in contact with the second substrate 200 to be evenly distributed.

[0079] Secondly, please refer to Figure 5 , Figure 5 This is a schematic diagram of another type of second substrate provided in an embodiment of this application. The second substrate 200 may further include an electrochromic layer 204 located between any two adjacent color resist blocks 2021, the electrochromic layer 204 having a transparent state and a filtering state. Here, when the electrochromic layer 204 is in the transparent state (transparent color), the electrochromic layer 204 allows light of all wavelengths to pass through; when the electrochromic layer 204 is in the filtering state, the electrochromic layer 204 can filter light of different wavelengths. For example, if the electrochromic layer 204 in the filtering state allows light of red wavelengths to pass through, then the electrochromic layer 204 presents a red filtering state, so that the handwriting in the area corresponding to the electrochromic layer 204 in the liquid crystal handwriting tablet 000 is displayed in red.

[0080] Since the electrochromic layer 204 requires an electric field to switch between its transparent and filtered states, the liquid crystal handwriting tablet 000 may further include a driving electrode layer 400 and a common electrode layer 500 located on either side of the electrochromic layer 205. Thus, when a driving voltage is applied to the driving electrode layer 400 and a common voltage is applied to the common electrode layer 500, an electric field is formed between them, allowing the electrochromic layer 204 to switch from its transparent to its filtered state. When no voltage is applied to either the driving electrode layer 400 or the common electrode layer 500, no electric field is formed between them, and the electrochromic layer 204 can switch from its filtered state to its transparent state.

[0081] In this scenario, when it is necessary to improve the color saturation of the LCD handwriting tablet 000 display, the electrochromic layer 204 between any two adjacent color resist blocks 2021 within the filter region 200a can be switched to a filter state via the driving electrode layer 400 and the common electrode layer 500. For example, under the control of the driving electrode layer 400 and the common electrode layer 500, the portion of the electrochromic layer 204 surrounding each color resist block 2021 can be in a filter state, and the color of the electrochromic layer 204 is the same as the color of that color resist block 2021. For instance, the portion of the electrochromic layer 204 surrounding the red color resist block 2021R can exhibit a red filter state; the portion of the electrochromic layer 204 surrounding the green color resist block 2021G can exhibit a green filter state; and the portion of the electrochromic layer 204 surrounding the blue color resist block 2021B can exhibit a blue filter state. Thus, since the portion of the electrochromic layer 204 that transforms into a filter state also functions as the color resist block 2021, the area of ​​the color resist block 2021 projected onto the second substrate 201 within the filter region 200a increases. This increases the area through which white light passes through the color resist block 2021 within the filter region 200a, thereby resulting in higher color saturation for the liquid crystal writing tablet 000. When it is necessary to increase the brightness of the liquid crystal writing tablet 000, the electrochromic layer 204 between any two adjacent color resist blocks 2021 within the filter region 200a can be transformed into a transparent state through the first transparent electrode layer 203 and the second transparent electrode layer 204. In this way, the electrochromic layer 204 transformed into a transparent state between any two adjacent color resist blocks 2021 allows white light to exit without passing through the color resist block 2021, resulting in higher brightness for the liquid crystal writing tablet 000. It should be noted that the structure and driving principle of the above-mentioned driving electrode layer 400 and common electrode layer 500 can be referred to the corresponding content in the second optional implementation method below, and will not be repeated here in the embodiments of this application.

[0082] For the second optional implementation method, please refer to... Figure 6 , Figure 6 This is a schematic diagram of another liquid crystal handwriting tablet provided in an embodiment of this application. The second substrate 200 may further include an electrochromic layer 205 located on one side of the second substrate 201, wherein the portion of the electrochromic layer 205 located within the light filtering region 200a has a light-transmitting state and a light-filtering state.

[0083] In this application, the liquid crystal handwriting tablet 000 may further include a driving electrode layer 400 and a common electrode layer 500 located on both sides of the electrochromic layer 205. The driving electrode layer 400 may include a driving electrode 401 located within the filter region 200a. The portion of the electrochromic layer 205 located within the filter region 200a is configured to switch between a transparent state and a filter state under the control of the driving electrode 401 and the common electrode layer 500 within the filter region 200a. Here, the common electrode layer 500 has a common electrode 501. When a driving voltage is applied to the driving electrode 401 and a common voltage is applied to the common electrode 501, an electric field is formed between the driving electrode 401 and the common electrode 501, allowing the electrochromic layer 205 located within the filter region 200a to switch from a transparent state to a filter state. Here, the electrochromic layer 205 in the filter state can filter light of different wavelengths. When no voltage is applied to either the driving electrode 401 or the common electrode 501, no electric field is formed between them, and the electrochromic layer 205 located in the filter region 200a can change from a filter state to a transparent state. Here, the transparent electrochromic layer 205 allows light of all wavelengths to pass through. It should be noted that the different electric field strengths between the driving electrode 401 and the common electrode 501 can cause the electrochromic layer 205 in the filter region 200a to filter different wavelengths of light; that is, the written handwriting on the liquid crystal writing tablet 000 displays a different color in the corresponding area of ​​the filter region 200a. It should also be noted that there is at least one driving electrode 401 in the driving electrode layer 400, and each driving electrode 401 corresponds one-to-one with at least one filter region 200a. The orthographic projection of each driving electrode 401 on the second substrate 201 lies within the orthographic projection of the corresponding filter region 200a on the second substrate 201.

[0084] In this application embodiment, the shape and structure of the driving electrode 401 and the common electrode 501 can vary. This application embodiment will illustrate the following four cases as examples:

[0085] For the first scenario, please refer to... Figure 7 , Figure 7This is a top view of a driving electrode and a common electrode provided in an embodiment of this application. Both the driving electrode 401 and the common electrode 501 within the filter region 200a are planar electrodes, and the outer boundary of the orthographic projection of the driving electrode 401 onto the second substrate 201 coincides with the outer boundary of the orthographic projection of the common electrode 501 onto the second substrate 201. Thus, under the action of the driving electrode 401 and the common electrode 501, the electrochromic layer 205 can be transformed into a filter state, allowing the region in the liquid crystal writing tablet 000 corresponding to the electrochromic layer 205 to display the same color. Here, the driving electrode 401 and the common electrode 501 can only form one filter region 200a. For example, when the size of the filter region 200a is equal to the size of the display surface of the liquid crystal writing tablet 000, under the action of the driving electrode 401 and the common electrode layer 500, the entire display surface of the liquid crystal writing tablet 000 can display the same color.

[0086] For the second scenario, please refer to [the relevant documentation / reference]. Figure 8 , Figure 8 This is a top view of another driving electrode and common electrode provided in an embodiment of this application. The driving electrode 401 can be strip-shaped, and there are multiple driving electrodes 401 in the driving electrode layer 400, with multiple strip-shaped driving electrodes 401 arranged in a row along one direction. The common electrode 501 is a planar electrode. The orthographic projection of the multiple strip-shaped driving electrodes 401 on the second substrate 201 lies within the orthographic projection of the common electrode 501 on the second substrate 201. In this way, the multiple strip-shaped driving electrodes 401 correspond one-to-one with multiple filter regions 200a. Thus, under the action of the driving electrode 401 and the common electrode 501, the electrochromic layer 205 corresponding to the strip-shaped driving electrode 401 can be transformed into a filter state, so that the region in the liquid crystal handwriting tablet 000 with the same shape as the strip-shaped driving electrode 401 can present the same color. Thus, the LCD handwriting tablet 000 has multiple light-filtering areas 200a, each of which is strip-shaped. The arrangement direction of the multiple light-filtering areas 200a is the same as the arrangement direction of the multiple driving electrodes 401. It should be noted that if the driving voltage applied to each strip-shaped driving electrode 401 is different, then each light-filtering area 200a in the LCD handwriting tablet 000 can display a different color.

[0087] In other possible implementations, the common electrode 501 can also be a strip electrode. Please refer to [reference needed]. Figure 9 , Figure 9This is a top view of another type of driving electrode and common electrode provided in this application embodiment. The common electrode layer 500 also contains multiple common electrodes 501, and the arrangement direction of the multiple strip-shaped common electrodes 501 is the same as the arrangement direction of the multiple strip-shaped driving electrodes 401. When the width h1 of the strip-shaped driving electrode 401 is less than the width h2 of the strip-shaped common electrode 501, there will be a strip-shaped overlapping area between the orthographic projection of the strip-shaped driving electrode 401 on the second substrate 201 and the orthographic projection of the strip-shaped common electrode 501 on the second substrate 201. Thus, under the action of the driving electrode 401 and the common electrode 501, the electrochromic layer 205 corresponding to the overlapping portion of the strip can be transformed into a filter state, so that the filter area 200a corresponding to the overlapping portion of the strip in the liquid crystal handwriting tablet 000 can present the same color. Therefore, the multiple filter areas 200a in the liquid crystal handwriting tablet 000 are the multiple overlapping areas of the strip.

[0088] For the third scenario, please refer to [the relevant documentation / reference]. Figure 10 , Figure 10 This is a top view of another driving electrode and common electrode provided in an embodiment of this application. Both the driving electrode 401 and the common electrode 501 can be strip-shaped. The arrangement direction of the plurality of strip-shaped driving electrodes 401 intersects with the arrangement direction of the plurality of strip-shaped common electrodes 501. For example, the arrangement direction of the plurality of strip-shaped driving electrodes 401 is perpendicular to the arrangement direction of the plurality of strip-shaped common electrodes 501. Here, the area where one strip-shaped driving electrode 401 intersects with one strip-shaped common electrode 501 is a filter region 200a. Thus, under the action of the driving electrode 401 and the common electrode 501, the electrochromic layer 205 corresponding to the intersecting area can be transformed into a filter state, so that the filter region 200a corresponding to the intersecting area in the liquid crystal handwriting tablet 000 can display the same color. Thus, the liquid crystal handwriting tablet 000 has multiple light-filtering regions 200a, each of which is block-shaped, and the multiple light-filtering regions 200a are arranged in multiple rows and columns. It should be noted that if different voltages are applied to each strip-shaped driving electrode 401 and each strip-shaped common electrode layer 500, then each light-filtering region 200a in the liquid crystal handwriting tablet 000 can display a different color.

[0089] For the fourth scenario, please refer to [the relevant documentation / reference]. Figure 11 , Figure 11 This is a top view of a driving electrode provided in an embodiment of this application. The driving electrode 401 can be block-shaped, with multiple driving electrodes 401 arranged in an array, and each driving electrode 401 has a corresponding thin-film transistor 4011. Here, as... Figure 7 As shown, the common electrode 501 can be a panel electrode.

[0090] The second substrate 200 may further include multiple first signal lines A1 and multiple second signal lines A2 for driving each driving electrode 401. The first signal lines A1 and the second signal lines A2 are vertically distributed. Here, a driving electrode 401 and a thin-film transistor 4011 can be distributed within the area enclosed by any two first signal lines A1 and any two second signal lines A2. In this way, multiple filtering regions 200a correspond one-to-one with multiple block-shaped driving electrodes 401. Thus, the liquid crystal handwriting tablet 000 can apply electrical signals to the thin-film transistor 4011 through the first signal lines A1 and the second signal lines A2 to control each driving electrode 401 within the filtering region 200a. In this way, under the action of the driving electrode 401 and the common electrode 501, the electrochromic layer 205 corresponding to each driving electrode 401 changes to a filtering state, so that the region in the liquid crystal handwriting tablet 000 corresponding to each driving electrode 401 can display the same color. Thus, the LCD handwriting tablet 000 has multiple light-filtering areas 200a, each of which is block-shaped, and the arrangement of the multiple light-filtering areas 200a is the same as the arrangement of the multiple block-shaped driving electrodes 401. It should be noted that, since each driving electrode 401 in the LCD handwriting tablet 000 can be controlled individually, different colors can be displayed in each light-filtering area 200a of the LCD handwriting tablet 000.

[0091] It should be noted that, in the above four cases, the positions of the driving electrode layer 400 and the common electrode layer 500 on both sides of the electrochromic layer 205 are not limited. For example, the common electrode layer 500 can be located on the side of the electrochromic layer 205 away from the first substrate 100, and the driving electrode layer 400 can also be located on the side of the electrochromic layer 205 away from the first substrate 100. Therefore, this application will illustrate with the following two possible implementation methods as examples:

[0092] The first possible approach is as follows: Figure 6 As shown, when the driving electrode layer 400 is located on the side of the electrochromic layer 205 away from the first substrate 100, the electrochromic layer 205 is located on the side of the second substrate 201 close to the first substrate 100, and the driving electrode layer 400 is located on the side of the electrochromic layer 205 in the second substrate 200 close to the second substrate 200. The common electrode layer 500 can be located on the side of the electrochromic layer 205 in the second substrate 200 away from the second substrate 200. The common electrode layer 500, the liquid crystal layer 300, and the pixel electrode layer 103 are used to form the erasing portion of the liquid crystal writing tablet 000. The common electrode layer 500, the electrochromic layer 205, and the driving electrode layer 400 are used to form the color-changing portion of the liquid crystal writing tablet 000. Here, the erasing portion and the color-changing portion of the liquid crystal writing tablet 000 can share a common electrode layer 500, effectively simplifying the manufacturing steps of the liquid crystal writing tablet 000.

[0093] For the second possible method, please refer to [link / reference]. Figure 12 , Figure 12 This is a schematic diagram of another liquid crystal writing tablet provided in this application embodiment. When the common electrode layer 500 is located on the side of the electrochromic layer 205 away from the first substrate 100, the driving electrode layer 400 is located on the side of the plurality of protrusions 102 in the first substrate 100 away from the first substrate 101, the electrochromic layer 205 is located on the side of the second substrate 201 close to the first substrate 100, and the common electrode layer 500 is located on the side of the electrochromic layer 205 in the second substrate 200 close to the second substrate 201. The common electrode layer 500, the liquid crystal layer 300, and the driving electrode layer 400 are used to form the erasing portion of the liquid crystal writing tablet 000. The common electrode layer 500, the electrochromic layer 205, and the driving electrode layer 400 are used to form the color-changing portion of the liquid crystal writing tablet 000.

[0094] In this configuration, the first substrate 100 has multiple pixel regions. When the second substrate 200 has multiple filter regions 200a corresponding one-to-one with the multiple pixel regions, and the area of ​​the filter region 200a is equal to the area of ​​the corresponding pixel region, the pixel electrode layer 103 and the driving electrode layer 400 are reused. Here, since the voltage required to enable the electrochromic layer 205 to switch between a transparent state and a light-blocking state is typically small, while the voltage required to drive the bistable liquid crystal molecules in the pixel region of the liquid crystal writing tablet 000 is typically large, when a small voltage is applied to the pixel electrode layer 103, this voltage will not affect the state of the bistable liquid crystal molecules in the liquid crystal writing tablet 000, that is, it will not affect the display and erasure of the liquid crystal writing tablet 000.

[0095] In this application, the multiple raised structures 102 in the liquid crystal writing tablet 000 are all made of a transparent insulating material. The first substrate 100 may further include a light-absorbing layer 104 located on the side of the first substrate 100 opposite to the second substrate 200. The light-absorbing layer 104 is used to absorb light of at least a portion of the wavelength range so that the liquid crystal writing tablet 000 displays a background color. For example, the light-absorbing layer 104 may be a light-absorbing structure such as a black aluminum honeycomb panel or black ink. In this way, when the bistable liquid crystal molecules change from a planar texture to a focal conic texture under the action of the voltage difference between the pixel electrode 1031 and the common electrode, the bistable liquid crystal molecules that have changed to a focal conic texture can transmit incident external light, so that the light-absorbing layer 104 in the first substrate 100 can absorb all light in the visible light band, thereby making the liquid crystal writing tablet 000 display a background color (e.g., black) that is the same as the color of the light-absorbing layer 104. That is, the liquid crystal writing tablet 000 realizes the erasure of written handwriting. In other possible implementations, the light-absorbing layer 104 can absorb light other than the green light band. In this way, when the bistable liquid crystal molecules change from a planar texture to a focal conic texture, the light-absorbing layer 104 in the first substrate 100 can absorb light other than the green light band, so that the liquid crystal writing tablet 000 displays a green background color.

[0096] In this embodiment, for the two optional implementation methods described above, the multiple filter areas 200a can be located at any position in the liquid crystal handwriting tablet 000, and each filter area 200a can be displayed using either of the two optional implementation methods. In this application, the color of the handwriting displayed by the liquid crystal handwriting tablet 000 can be a single color or a gradient color. This application will illustrate with the following two exemplary implementation methods:

[0097] In the first exemplary implementation, when the color of the handwriting displayed by the LCD handwriting tablet 000 can be a single color, please refer to... Figure 13 , Figure 13 This is a top view of a second substrate provided in an embodiment of this application. The second substrate 200 has a plurality of filter regions 200a, which are arranged in an array, and the plurality of filter regions 200a include filter regions 200a of at least two colors. Specifically, in a row of filter regions 200a, any two adjacent filter regions 200a have different colors, and in a column of filter regions 200a, any two adjacent filter regions 200a have different colors.

[0098] In this embodiment, multiple filter regions 200a arranged in an array can form a monochrome partition. In one case, when the area corresponding to a monochrome partition of the liquid crystal writing tablet 000 needs to display one of the colors red, green, and blue, all filter regions 200a within a monochrome partition in the second substrate 200 can be entirely composed of a red filter region R, a green filter region G, or a blue filter region B. In another case, when the area corresponding to a monochrome partition of the liquid crystal writing tablet 000 needs to display a color other than red, green, and blue, the filter regions 200a in the second substrate 200 can be obtained by combining at least two of the filter regions 200a of red, green, and blue. Thus, after white light passes through the monochrome partition, it mixes with the color displayed within the monochrome partition to form a color resulting from the mixture of at least two colors within the filter region 200a. For example, when the area corresponding to a monochrome zone on the liquid crystal writing tablet 000 needs to display yellow, in a row of filter areas 200a on the second substrate 200, red filter areas R and green filter areas G are alternately distributed, and in a column of filter areas 200a, red filter areas R and green filter areas G are alternately distributed. Furthermore, the area of ​​the red filter area R projected onto the second substrate 201 is equal to the area of ​​the green filter area projected onto the second substrate 201. In this way, the handwriting on the liquid crystal writing tablet 000 within the area corresponding to that monochrome zone will display yellow.

[0099] It should be noted that the areas of the multiple color resist blocks 2021 in the LCD handwriting tablet 000 projected onto the second substrate 201 are not all the same. That is, the areas of the color resist blocks 2021 arranged in some regions of the LCD handwriting tablet 000 projected onto the second substrate 201 are smaller, while the areas of the color resist blocks 2021 arranged in some regions of the LCD handwriting tablet 000 projected onto the second substrate 201 are larger. In this way, a sufficient amount of light can pass through the transparent filler layer 203 and be emitted from the LCD handwriting tablet 000, effectively improving the display brightness of the LCD handwriting tablet 000.

[0100] In the second exemplary implementation, when the color of the handwriting displayed by the LCD handwriting tablet 000 can be a gradient, please refer to... Figure 14 , Figure 14This is a top view of another second substrate provided in an embodiment of this application. The second substrate 200 has a plurality of filter regions 200a, which are divided into a plurality of strip-shaped filter partitions 200b. Each filter partition 200b includes at least one filter region 200a. The plurality of filter regions 200a include filter regions 200a of at least two colors. Within a filter partition 200b, all filter regions 200a have the same color, and any two adjacent filter partitions 200b have different colors. Here, when the filter region 200a is a strip-shaped filter region 200a, one filter partition 200b can correspond to one strip-shaped filter region 200a, and the color of the filter partition 200b is the same as the color of the strip-shaped filter region 200a. When multiple filter regions 200a are arranged in an array, the multiple filter regions 200a arranged in at least one column can form a filter partition 200b, and the colors of the multiple filter regions 200a are all the same. For example, when a filter partition 200b is a red filter partition R, each filter region 200a within that filter partition 200b is a red filter region 200a. This allows for higher color saturation in the display of the LCD handwriting tablet 000. It should be noted that when multiple filter regions 200a are arranged in an array, at least one column of filter regions 200a with the same color can be a transparent fill layer 203. This ensures that the LCD handwriting tablet 000 can display rich colors while also maintaining good display brightness.

[0101] In addition to the two exemplary implementations described above, the portion of the electrochromic layer 205 located within the filter region 200a can also be controlled via the driving electrode 401 and the common electrode 501, so that the brightness and color saturation of the liquid crystal handwriting tablet 000 can be adjusted. Here, the control method of the driving electrode 401 and the common electrode 501 over the electrochromic layer 205 can be referred to the corresponding content in the above embodiments, and will not be repeated here.

[0102] In this embodiment, among the plurality of strip-shaped filter zones 200b, two adjacent filter zones 200b or three adjacent filter zones 200b are used to form a color mixing zone 200c. For any two color mixing zones 200b with different colors, at least one of the two color mixing zones 200b with the same color has a different width. Here, the color displayed in the color mixing zone 200c of the liquid crystal handwriting tablet 000 is determined by the colors and widths of the two adjacent filter zones 200b. Similarly, the color displayed in the color mixing zone 200c of the liquid crystal handwriting tablet 000 can also be determined by the colors and widths of the three adjacent filter zones 200b.

[0103] In this application, as Figure 14 As shown, when two adjacent filter zones 200b form a color mixing zone 200c, the second substrate 200 has: at least one color gradient zone 200d composed of a plurality of color mixing zones 200c, and filter zones 200b of a first color and a second color located on both sides of the color gradient zone 200d. The width of the filter zone 200b of the first color is greater than the width of the filter zone 200b of the same first color within each color mixing zone 200c of the color gradient zone 200d. The width of the filter zone 200b of the second color is greater than the width of the filter zone 200b of the same second color within each color mixing zone 200c of the color gradient zone 200d. Along the direction from the first color filter partition 200b to the second color filter partition 200b, the width of the filter partition 200b with the same first color in each color mixing partition 200c in the color gradient partition 200d gradually decreases, and the width of the filter partition 200b with the same second color in each color mixing partition 200c gradually increases.

[0104] In this application, the first color and the second color are any two of red, green, and blue. Thus, in the direction from the filter partition 200b of the first color to the filter partition 200b of the second color, the second substrate 200 gradually transitions from the first color to the second color. For example, when the filter partition 200b of the first color is a red filter partition R and the filter partition 200b of the second color is a green filter partition G, the color in the color gradient partition 200d between these two filter partitions 200b can gradually transition from red, orange, yellow, yellowish-green to green. When the filter partition 200b of the first color is a blue filter partition B and the filter partition 200b of the second color is a red filter partition R, the color in the color gradient partition 200d between these two filter partitions 200b can gradually transition from blue, purple, pinkish-purple to red. When the first color filter zone 200b is a green filter zone G and the second color filter zone 200b is a blue filter zone B, the color in the color gradient zone 200d located between these two filter zones 200b can gradually change from green, cyan, and blue-green to blue.

[0105] In the embodiments of this application, please refer to Figure 15 , Figure 15This is a top view of another second substrate provided in an embodiment of this application. When three adjacent filter zones 200b form a color mixing zone 200c, the colors of the three filter zones 200b within the color mixing zone 200c are red, green, and blue, respectively. Here, a color mixing zone 200c contains filter zones 200b of three colors, which allows the color mixing zone 200c to mix more colors. This effectively improves the color richness displayed by the LCD handwriting tablet 000.

[0106] In this scenario, when the red, green, and blue filter zones 200b within a color mixing zone 200c vary in a certain proportion, the color displayed by color mixing zone 200c can be any color other than red, green, and blue. For example, when the width ratio of the red filter zone R, green filter zone G, and blue filter zone B within a color mixing zone 200c is 1.5:1:1, color mixing zone 200c can display an orange-pink color.

[0107] In the embodiments of this application, such as Figure 15 As shown, when adjacent three-color filter partitions 200b form multiple color mixing partitions 200c, the multiple color mixing partitions 200c can form at least one color gradient partition 200d. A color gradient partition 200d is formed by gradually decreasing the width of one or two colors along a certain direction in the multiple color mixing partitions 200c. For example, the color gradient partition 200d has color mixing partitions 200c1 and 200c2 on both sides. From color mixing partition 200c1 to color mixing partition 200c2, the width of the filter partition 200b of one color in color mixing partition 200c1 gradually decreases, while the widths of the filter partitions 200b of the other two colors in color mixing partition 200c1 remain unchanged, thus obtaining a color gradient partition 200d. Alternatively, from the direction of color mixing zone 200c1 to color mixing zone 200c2, the width of the filter zones 200b of the two colors in color mixing zone 200c1 gradually decreases, while the width of the filter zone 200b of the other color in color mixing zone 200c1 remains unchanged, thus obtaining a color gradient zone 200d.

[0108] Assuming four color mixing zones 200c are arranged horizontally, the width ratio of the red filter zone R, green filter zone G, and blue filter zone B in the first color mixing zone 200c is 1.5:1:1; the width ratio of the red filter zone R, green filter zone G, and blue filter zone B in the second color mixing zone 200c is 1:1:1; the width ratio of the red filter zone R, green filter zone G, and blue filter zone B in the third color mixing zone 200c is 0.75:1:1; and the width ratio of the red filter zone R, green filter zone G, and blue filter zone B in the fourth color mixing zone 200c is 0.5:1:1. Thus, a color gradient zone 200d can be formed from the first color mixing zone 200c to the fourth color mixing zone 200c. Here, as the width of the red filter zone R within the color mixing zone 200c gradually decreases, the red content in the color presented by the color mixing zone 200c decreases. At this time, the color of the color mixing zone 200c is more inclined to be a mixture of green and blue.

[0109] In the embodiments of this application, please refer to Figure 16 , Figure 16 This is a top view of another second substrate provided in an embodiment of this application. The shape of the filter region 200a in the second substrate 200 can be a long strip or an arc strip.

[0110] In this application, when the filter region 200a is elongated, its length direction is parallel to either the length or width direction of the liquid crystal writing tablet 000; or, its length direction intersects both the length and width directions of the liquid crystal writing tablet 000. When the filter region 200a in the second substrate 200 is arc-shaped, the area in the liquid crystal writing tablet 000 corresponding to the filter region 200a is also arc-shaped, and the color displayed within this arc-shaped area is determined by the color displayed by the filter region 200a. Here, as... Figure 16 The diagram shows the intersection of the length direction of the filter region 200a with the length and width directions of the LCD handwriting tablet 000.

[0111] It should be noted that the materials of the driving electrode layer 400, the common electrode layer 500 and the pixel electrode layer 103 in the LCD handwriting tablet 000 can all include transparent conductive materials such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0112] In summary, the liquid crystal writing tablet provided in this application includes: a first substrate, a second substrate, and a liquid crystal layer located between the first substrate and the second substrate. Due to the raised structure in the first substrate, the liquid crystal writing tablet can mix external light into white light, and the second substrate has a filter area that allows different wavelengths of light from the mixed white light to pass through. Therefore, the types of colors displayed in different areas of the liquid crystal writing tablet can be set by different filter areas in the second substrate. In this way, the liquid crystal writing tablet can display a wider variety of colors, thereby effectively improving the display effect of the liquid crystal writing tablet.

[0113] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0114] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0115] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A liquid crystal handwriting pad, characterized by, The liquid crystal hand-writing board comprises: a first substrate and a second substrate arranged oppositely, and a liquid crystal layer between the first substrate and the second substrate; the liquid crystal layer comprises bistable liquid crystal molecules; the first substrate comprises a first substrate and a plurality of protruding structures on the side of the first substrate close to the second substrate, the protruding structures are used to adjust the arrangement direction of the liquid crystal molecules in the liquid crystal layer, so that the liquid crystal molecules with different arrangement directions in the liquid crystal layer can reflect light with different wavelengths in external light; the second substrate comprises a flexible second substrate, and the second substrate has a plurality of light filtering areas, the orthographic projection of the light filtering areas on the first substrate overlaps with the orthographic projection of at least two protruding structures on the first substrate; the plurality of light filtering areas comprises light filtering areas of at least two colors; the plurality of light filtering areas is divided into a plurality of strip-shaped light filtering sub-regions, each of the light filtering sub-regions comprises at least one light filtering area; the light filtering areas in one light filtering sub-region are of the same color, and the colors of any two adjacent light filtering sub-regions are different; two or three adjacent light filtering sub-regions are used to form a mixed color sub-region; a plurality of adjacent mixed color sub-regions are used to form a color gradient sub-region; when two adjacent light filtering sub-regions form a mixed color sub-region, the width of the light filtering sub-regions with the same color in the plurality of mixed color sub-regions of the color gradient sub-region gradually decreases along the arrangement direction of the plurality of mixed color sub-regions; when three adjacent light filtering sub-regions form a mixed color sub-region, the width of the light filtering sub-regions with one or two same colors in the plurality of mixed color sub-regions of the color gradient sub-region gradually decreases along the arrangement direction of the plurality of mixed color sub-regions.

2. The liquid crystal handwriting pad of claim 1, wherein The second substrate further comprises a color filter layer on the side of the second substrate, the color filter layer comprises a plurality of color resistance blocks corresponding to the plurality of light filtering areas, and the area occupied by the color resistance block on the second substrate is the corresponding light filtering area.

3. The liquid crystal handwriting pad of claim 2, wherein, The second substrate further comprises a transparent filling layer between any two adjacent color resistance blocks.

4. The liquid crystal handwriting pad of claim 2, wherein, The second substrate further comprises an electrochromic layer between any two adjacent color resistance blocks, and the electrochromic layer has a light transmission state and a light filtering state.

5. The liquid crystal handwriting pad of claim 1, wherein, The second substrate further comprises an electrochromic layer on the side of the second substrate, and the part of the electrochromic layer in the light filtering area has the light transmission state and the light filtering state. The liquid crystal hand-writing board further comprises a driving electrode layer and a common electrode layer on both sides of the electrochromic layer. The driving electrode layer comprises a driving electrode in the light filtering area, and the part of the electrochromic layer in the light filtering area is configured to switch between the light transmission state and the light filtering state under the control of the driving electrode in the light filtering area and the common electrode layer.

6. The liquid crystal handwriting pad of claim 5, wherein, The electrochromic layer is on the side of the second substrate close to the first substrate, the driving electrode layer is on the side of the electrochromic layer in the second substrate close to the second substrate, and the common electrode layer is on the side of the electrochromic layer in the second substrate away from the second substrate; The first substrate further comprises a pixel electrode layer. The common electrode layer, the liquid crystal layer and the pixel electrode layer are used to form an erasing part of the liquid crystal handwriting board; and the common electrode layer, the electrochromic layer and the driving electrode layer are used to form a color-changing part of the liquid crystal handwriting board.

7. The liquid crystal handwriting pad of claim 5, wherein, The driving electrode layer is located on a side of the plurality of protruding structures in the first substrate away from the first substrate, the electrochromic layer is located on a side of the second substrate close to the first substrate, and the common electrode layer is located on a side of the electrochromic layer in the second substrate close to the second substrate. The common electrode layer, the liquid crystal layer and the driving electrode layer are used to form an erasing part of the liquid crystal handwriting board; and the common electrode layer, the electrochromic layer and the driving electrode layer are used to form a color-changing part of the liquid crystal handwriting board.

8. The liquid crystal handwriting pad of claim 1, wherein, For any two color-mixing partitions with different colors, the width of at least one filter partition with the same color in the two color-mixing partitions is different.

9. The liquid crystal handwriting pad of claim 8, wherein, When two adjacent filter partitions form a color-mixing partition, the second substrate has at least one color gradient partition composed of a plurality of color-mixing partitions, and a first-color filter partition and a second-color filter partition located on both sides of the color gradient partition. The width of the first-color filter partition is greater than the width of the filter partition with the same color as the first color in each color-mixing partition in the color gradient partition. The width of the second-color filter partition is greater than the width of the filter partition with the same color as the second color in each color-mixing partition in the color gradient partition. In the direction from the first-color filter partition to the second-color filter partition, the width of the filter partition with the same color as the first color in each color-mixing partition in the color gradient partition gradually decreases, and the width of the filter partition with the same color as the second color in each color-mixing partition gradually increases.

10. The liquid crystal handwriting pad of claim 9, wherein, The first color and the second color are any two of red, green and blue.

11. The liquid crystal handwriting pad according to any one of claims 8 to 10, wherein, The shape of the filter region is a long strip or an arc-shaped strip.

12. The liquid crystal handwriting pad according to any one of claims 1 to 7, wherein, The first substrate further comprises a plurality of pixel electrodes located on a side of the plurality of protruding structures away from the first substrate, and the orthogonal projection of the pixel electrodes on the first substrate overlaps with the orthogonal projection of at least two protruding structures on the first substrate.

13. The liquid crystal handwriting pad according to any one of claims 1 to 7, wherein The maximum thickness of the protruding structure ranges from 0.5 to 3 microns, the width of the protruding structure ranges from 3 to 10 microns, and the maximum slope angle of the protruding structure ranges from 5 degrees to 60 degrees.

14. The liquid crystal handwriting pad according to any one of claims 1 to 7, wherein, The plurality of protruding structures are all made of transparent insulating material. The first substrate further comprises a light-absorbing layer located on a side of the first substrate away from the second substrate, and the light-absorbing layer is used to absorb at least part of the wavelength of light so that the liquid crystal handwriting board presents a background color.

Images