Multicolor liquid crystal writing device
Through the combination of the two-layer liquid crystal layer structure and a green substrate, the problem that existing liquid crystal writing devices are difficult to display white handwriting is solved, and the display of white handwriting and the annotation of other color handwriting is realized, which reduces the cost and thickness, and meets the needs of education, teaching and office.
Patent Information
- Application Number
- CN202422149670.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-09-03
AI Technical Summary
It is difficult for existing LCD writing devices to directly display white handwriting, and the cost and thickness increase when realizing multi-color display, affecting the user experience.
By adopting a two-layer liquid crystal layer structure, combining a green substrate and a transparent conductive layer, the display of white text is realized, and local erasing and other color text is realized through the etching line design of the conductive layer.
It realizes the writing display of white handwriting, while reducing the production cost and thickness of the product, meeting the needs of education, teaching and office, and ensuring the accuracy of local erasing.
Smart Images
Figure CN222994807U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid crystal writing devices, in particular to a multicolor liquid crystal writing device. Background Art
[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.
[0003] Liquid crystal writing devices have been widely used in many fields such as education and office work, and have very good development prospects; their working principle is to utilize the bistable characteristics of liquid crystals, and record the writing pressure traces of the writing pen through the pressure acting on the liquid crystal writing device, and then display the corresponding writing content; by applying an electric field, the bistable liquid crystal structure changes, so that the writing traces on the liquid crystal writing device disappear to achieve erasure.
[0004] In the prior art, the structure of a liquid crystal writing device usually includes: a first base layer, a liquid crystal layer, a second base layer, and a substrate arranged in sequence from top to bottom; wherein, conductive layers are respectively arranged on the surfaces of the first base layer and the second base layer close to the liquid crystal layer; by dividing the upper and lower conductive layers into a plurality of mutually insulated conductive regions, local erasure can be realized.
[0005] Since a single layer of liquid crystal can only present one color, therefore, if there is only one layer of liquid crystal structure, only single-color writing can be achieved, and multicolor writing cannot be achieved. For this reason, the prior art discloses a structure with multiple liquid crystal layers. Each liquid crystal layer structure includes a liquid crystal layer and conductive layers respectively arranged on the upper and lower sides of the liquid crystal layer; each liquid crystal layer corresponds to displaying one color. By controlling the electric field applied to each liquid crystal layer, the color corresponding to the set liquid crystal layer structure can be controlled to be displayed, and thus multicolor display can be achieved.
[0006] In the field of education and teaching, it is often required that the blackboard can display white handwriting and can use handwriting of other different colors for annotation; however, in the prior art, there is often no liquid crystal that can directly display white handwriting, and even if there is, it cannot meet the requirements of other color annotations; therefore, according to the multicolor display solution in the prior art, at least three colors (red, green, and blue) need to be superimposed to achieve the display of white handwriting; that is, at least three layers of liquid crystal structures need to be superimposed to display white handwriting; this greatly increases the cost of the liquid crystal writing device, and at the same time, also increases the thickness of the liquid crystal writing device, affecting the installation and use experience of customers. Summary of the Utility Model
[0007] In order to solve the above problems, the utility model proposes a multicolor liquid crystal writing device, which can realize the writing and display of white handwriting through two liquid crystal layer structures.
[0008] In some embodiments, the following technical solutions are adopted:
[0009] A multicolor liquid crystal writing device includes: a first base layer, a first liquid crystal layer, a second base layer, a third base layer, a second liquid crystal layer, a fourth base layer, and a substrate, which are sequentially arranged from top to bottom; wherein, a first conductive layer is provided on one side of the first base layer close to the first liquid crystal layer, and a second conductive layer is provided on one side of the second base layer close to the first liquid crystal layer; a third conductive layer is provided on one side of the third base layer close to the second liquid crystal layer, and a fourth conductive layer is provided on one side of the fourth base layer close to the second liquid crystal layer;
[0010] One of the first liquid crystal layer and the second liquid crystal layer can reflect red, and the other can reflect blue, and the substrate is a green substrate.
[0011] Among them, the first base layer, the first conductive layer, the second conductive layer, the second base layer, the third base layer, the third conductive layer, the fourth conductive layer, and the fourth base layer are all made of transparent materials.
[0012] In some other embodiments, the following technical solutions are adopted:
[0013] A multicolor liquid crystal writing device includes: a first base layer, a first liquid crystal layer, a second base layer, a second liquid crystal layer, a third base layer, and a substrate, which are sequentially arranged from top to bottom; wherein, a first conductive layer is provided on one side of the first base layer close to the first liquid crystal layer, and a second conductive layer is provided on one side of the second base layer close to the first liquid crystal layer; a third conductive layer is provided on one side of the second base layer close to the second liquid crystal layer, and a fourth conductive layer is provided on one side of the third base layer close to the second liquid crystal layer;
[0014] One of the first liquid crystal layer and the second liquid crystal layer can reflect red, and the other can reflect blue, and the substrate is a green substrate.
[0015] Among them, the first base layer, the first conductive layer, the second conductive layer, the second base layer, the third conductive layer, the fourth conductive layer, and the third base layer are all made of transparent materials.
[0016] In the above two solutions, the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer are respectively divided into a plurality of mutually insulated strip-shaped conductive regions by etching lines;
[0017] Among them, the etching lines on the first conductive layer and the etching lines on the third conductive layer are completely coincident or the deviation is within [-10%W min , 10%W min , and the etching lines on the second conductive layer and the etching lines on the fourth conductive layer are completely coincident or the deviation is within [-10%W min , 10%W min ;
[0018] Alternatively, the etched lines on the first conductive layer and the etched lines on the fourth conductive layer completely coincide or the deviation is within [-10%W min , 10%W min , and the etched lines on the second conductive layer and the etched lines on the third conductive layer completely coincide or the deviation is within [-10%W min , 10%W min ;
[0019] Alternatively, the etched lines on the first conductive layer coincide with some of the etched lines on the third conductive layer or the deviation is within [-10%W min , 10%W min , and the etched lines on the second conductive layer coincide with some of the etched lines on the fourth conductive layer or the deviation is within [-10%W min , 10%W min ; and the width of the conductive region on the first conductive layer is an integer multiple of the width of the conductive region on the third conductive layer, and the width of the conductive region on the second conductive layer is an integer multiple of the width of the conductive region on the fourth conductive layer;
[0020] Alternatively, the etched lines on the first conductive layer coincide with some of the etched lines on the fourth conductive layer or the deviation is within [-10%W min , 10%W min , and the etched lines on the second conductive layer coincide with some of the etched lines on the third conductive layer or the deviation is within [-10%W min , 10%W min ; and the width of the conductive region on the first conductive layer is an integer multiple of the width of the conductive region on the fourth conductive layer, and the width of the conductive region on the second conductive layer is an integer multiple of the width of the conductive region on the third conductive layer;
[0021] Alternatively, the etched lines on the third conductive layer coincide with some of the etched lines on the first conductive layer or the deviation is within [-10%W min , 10%W min , and the etched lines on the fourth conductive layer coincide with some of the etched lines on the second conductive layer or the deviation is within [-10%W min , 10%W min ; and the width of the conductive region on the third conductive layer is an integer multiple of the width of the conductive region on the first conductive layer, and the width of the conductive region on the fourth conductive layer is an integer multiple of the width of the conductive region on the second conductive layer;
[0022] Alternatively, the etched lines on the third conductive layer coincide with some of the etched lines on the second conductive layer or the deviation is within [-10%W min , 10%W minWithin the range, the etching lines on the fourth conductive layer coincide with or deviate from the partial etching lines on the first conductive layer within [-10%W min , 10%W min . Moreover, the width of the conductive region on the third conductive layer is an integer multiple of the width of the conductive region on the second conductive layer, and the width of the conductive region on the fourth conductive layer is an integer multiple of the width of the conductive region on the first conductive layer;
[0023] W min is the minimum width of the conductive region.
[0024] Furthermore, the conductive regions on each conductive layer are parallel to each other; the conductive region on the first conductive layer and the conductive region on the second conductive layer are perpendicular to each other in space; the conductive region on the third conductive layer and the conductive region on the fourth conductive layer are perpendicular to each other in space.
[0025] In some embodiments, the following technical solution is adopted:
[0026] A multicolor liquid crystal writing device includes: a first base layer, a first liquid crystal layer, a second base layer, a third base layer, a second liquid crystal layer, a fourth base layer, and a substrate, which are sequentially arranged from top to bottom; wherein, a first conductive layer is provided on one side of the first base layer close to the first liquid crystal layer, and a second conductive layer is provided on one side of the second base layer close to the first liquid crystal layer; a third conductive layer is provided on one side of the third base layer close to the second liquid crystal layer, and a fourth conductive layer is provided on one side of the fourth base layer close to the second liquid crystal layer;
[0027] One of the first liquid crystal layer and the second liquid crystal layer can reflect blue, and the other can reflect yellow; the substrate is a black substrate, or the fourth base layer is a black film, or a black film is attached between the fourth base layer and the substrate.
[0028] In some other embodiments, the following technical solution is adopted:
[0029] A multicolor liquid crystal writing device includes: a first base layer, a first liquid crystal layer, a second base layer, a second liquid crystal layer, a third base layer, and a substrate, which are sequentially arranged from top to bottom; wherein, a first conductive layer is provided on one side of the first base layer close to the first liquid crystal layer, and a second conductive layer is provided on one side of the second base layer close to the first liquid crystal layer; a third conductive layer is provided on one side of the second base layer close to the second liquid crystal layer, and a fourth conductive layer is provided on one side of the third base layer close to the second liquid crystal layer;
[0030] One of the first liquid crystal layer and the second liquid crystal layer can reflect blue, and the other can reflect yellow; the substrate is a black substrate, or the third base layer is a black film, or a black film is attached between the third base layer and the substrate.
[0031] In the above two solutions, the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer are respectively divided into a plurality of mutually insulated strip-shaped conductive regions by etching lines;
[0032] Among them, the etching lines on the first conductive layer and the etching lines on the third conductive layer are completely coincident or the deviation is within [-10%W min , 10%W min , the etching lines on the second conductive layer and the etching lines on the fourth conductive layer are completely coincident or the deviation is within [-10%W min , 10%W min ;
[0033] Or, the etching lines on the first conductive layer and the etching lines on the fourth conductive layer are completely coincident or the deviation is within [-10%W min , 10%W min , the etching lines on the second conductive layer and the etching lines on the third conductive layer are completely coincident or the deviation is within [-10%W min , 10%W min ;
[0034] Or, the etching lines on the first conductive layer coincide with some of the etching lines on the third conductive layer or the deviation is within [-10%W min , 10%W min , the etching lines on the second conductive layer coincide with some of the etching lines on the fourth conductive layer or the deviation is within [-10%W min , 10%W min ; And, the width of the conductive region on the first conductive layer is an integer multiple of the width of the conductive region on the third conductive layer, and the width of the conductive region on the second conductive layer is an integer multiple of the width of the conductive region on the fourth conductive layer;
[0035] Or, the etching lines on the first conductive layer coincide with some of the etching lines on the fourth conductive layer or the deviation is within [-10%W min , 10%W min , the etching lines on the second conductive layer coincide with some of the etching lines on the third conductive layer or the deviation is within [-10%W min , 10%W min ; And, the width of the conductive region on the first conductive layer is an integer multiple of the width of the conductive region on the fourth conductive layer, and the width of the conductive region on the second conductive layer is an integer multiple of the width of the conductive region on the third conductive layer;
[0036] Or, the etching lines on the third conductive layer coincide with some of the etching lines on the first conductive layer or the deviation is within [-10%W min , 10%W minWithin the range, the etching lines on the fourth conductive layer coincide with or deviate from the partial etching lines on the second conductive layer within [-10%W min , 10%W min . And the width of the conductive region on the third conductive layer is an integer multiple of the width of the conductive region on the first conductive layer, and the width of the conductive region on the fourth conductive layer is an integer multiple of the width of the conductive region on the second conductive layer;
[0037] Or, the etching lines on the third conductive layer coincide with or deviate from the partial etching lines on the second conductive layer within [-10%W min , 10%W min . The etching lines on the fourth conductive layer coincide with or deviate from the partial etching lines on the first conductive layer within [-10%W min , 10%W min . And the width of the conductive region on the third conductive layer is an integer multiple of the width of the conductive region on the second conductive layer, and the width of the conductive region on the fourth conductive layer is an integer multiple of the width of the conductive region on the first conductive layer;
[0038] W min is the minimum width of the conductive region.
[0039] Furthermore, the conductive regions on each conductive layer are parallel to each other; the conductive regions on the first conductive layer and the conductive regions on the second conductive layer are perpendicular to each other in space; the conductive regions on the third conductive layer and the conductive regions on the fourth conductive layer are perpendicular to each other in space.
[0040] Compared with the prior art, the beneficial effects of the present utility model are:
[0041] (1) With the cooperation of the green substrate and the two-layer liquid crystal layer structure, a device structure of the present utility model can achieve a display effect similar to that of a traditional teaching board with green background and white characters. At the same time, it can separately display other color characters and can be used to add other color annotations; for example: yellow can be displayed by superimposing green and red, and cyan can be displayed by superimposing green and blue; the writing and display of white characters can be achieved through the two-layer liquid crystal layer structure, and other color annotations can be added at the same time, which conforms to the current habits and requirements of education, teaching or office work, and reduces the production cost and thickness of the product.
[0042] (2) Another device structure of the present utility model uses the two-layer liquid crystal structure and the black substrate to achieve the display effect of black background and silver-white characters; at the same time, it can separately display other color characters and can be used to add other color annotations, such as: separately display blue, or separately display yellow; compared with the traditional solution that requires a three-layer liquid crystal structure to display white characters, the production cost and thickness of the product are also reduced.
[0043] (3) The solution that the etching lines on different conductive layers of the present utility model are completely or partially overlapped can ensure the local erasing effect of the writing, avoiding the situation of incomplete erasing or only partial color erasing due to the misalignment of the etching lines; meanwhile, through local erasing, the local accurate display of other color annotations is also ensured.
[0044] Other features and advantages of the additional aspects of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of this aspect. BRIEF DESCRIPTION OF THE DRAWINGS
[0045] Figure 1 It is a schematic structural diagram of the multi-color liquid crystal writing device in Embodiment 1 of the present utility model;
[0046] Figure 2 It is a schematic diagram of the complete overlap of the etching lines of two conductive layers in Embodiment 1 of the present utility model;
[0047] Figure 3 It is a schematic diagram of the non-overlap of the etching lines of two conductive layers in Embodiment 1 of the present utility model;
[0048] Figure 4 It is a schematic diagram of the partial overlap of the etching lines of two conductive layers in Embodiment 1 of the present utility model;
[0049] Figure 5 It is a schematic diagram of the local erasing area corresponding to two liquid crystal layers in Embodiment 1 of the present utility model;
[0050] Figure 6 It is a schematic structural diagram of the multi-color liquid crystal writing device in Embodiment 2 of the present utility model;
[0051] Wherein, 1. The first base layer, 2. The first conductive layer, 3. The first liquid crystal layer, 4. The second conductive layer, 5. The second base layer, 6. The third base layer, 7. The third conductive layer, 8. The second liquid crystal layer, 9. The fourth conductive layer, 10. The fourth base layer, 11. The substrate. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0052] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.
[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0054] Embodiment 1
[0055] In one or more embodiments, a multicolor liquid crystal writing device is disclosed, which combines Figure 1 , specifically including: a first base layer 1, a first liquid crystal layer 3, a second base layer 5, a third base layer 6, a second liquid crystal layer 8, a fourth base layer 10, and a substrate 11 arranged in sequence from top to bottom; wherein, a first conductive layer 2 is provided on the surface of the first base layer close to the first liquid crystal layer, and a second conductive layer 4 is provided on the surface of the second base layer close to the first liquid crystal layer; a third conductive layer 7 is provided on the surface of the third base layer close to the second liquid crystal layer, and a fourth conductive layer 9 is provided on the surface of the fourth base layer close to the second liquid crystal layer.
[0056] In this embodiment, the first base layer, the first conductive layer, the first liquid crystal layer, the second conductive layer, the second base layer, the third base layer, the third conductive layer, the second liquid crystal layer, the fourth conductive layer, and the fourth base layer are all made of transparent materials; the first base layer, the second base layer, the third base layer, and the fourth base layer can all be made of PET film, and the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer can all be made of ITO film.
[0057] Both the first liquid crystal layer and the second liquid crystal layer are provided with bistable liquid crystals. Among the first liquid crystal layer and the second liquid crystal layer, the bistable liquid crystals of one of them can reflect red, and the bistable liquid crystals of the other can reflect blue; that is, the first liquid crystal layer can reflect red, and the second liquid crystal layer can reflect blue; or, the first liquid crystal layer can reflect blue, and the second liquid crystal layer can reflect red.
[0058] Each conductive layer is connected with a driving circuit, and the driving circuit can apply voltages to the corresponding conductive layers respectively. By controlling the voltages applied to the first conductive layer and the second conductive layer, a set electric field can be formed at both ends of the first liquid crystal layer, so that the bistable liquid crystals in the first liquid crystal layer are flipped into the focal conic state, and thus the color reflected by this layer is not displayed, realizing the erasure of the handwriting color of this layer. The same principle applies to the second liquid crystal layer, and an electric field is applied to the second liquid crystal layer through the third conductive layer and the fourth conductive layer.
[0059] Due to the insulating property of the PET film, the first and second conductive layers are insulated from the third and fourth conductive layers. Moreover, because the thickness of the second or third substrate is much greater than the thickness of the liquid crystal layer, the electric field formed between the first or second conductive layer and the third or fourth conductive layer can be neglected compared to the electric field between the first and second conductive layers or between the third and fourth conductive layers.
[0060] For the sake of convenience in description, in this embodiment, it is taken as an example that the first liquid crystal layer can reflect red and the second liquid crystal layer can reflect blue for illustration.
[0061] In this embodiment, the substrate is a green substrate, and the background color of the entire liquid crystal writing device is green. By applying pressure to produce writing traces, when no voltage is applied to each conductive layer, since the first liquid crystal layer reflects red, the second liquid crystal layer reflects blue, and the substrate reflects green, the color seen by the human eye is the superposition of the three colors, that is, it shows white writing traces. Thus, a writing display effect of green background with white characters is formed, meeting the usage requirements of education, teaching, and office work.
[0062] In this case, if it is desired to display writing traces of other colors, for example, when a teacher wants to add annotations with writing traces of other colors during writing, at this time, it is possible to choose to apply a set electric field to the writing trace position of the first liquid crystal layer. The applied electric field erases the formed red writing trace on the first liquid crystal layer, and what the human eye sees is the superposition of green and blue, that is, it shows cyan writing traces. Similarly, it is also possible to choose to apply a set electric field to the writing trace position of the second liquid crystal layer. The applied electric field erases the formed blue writing trace on the second liquid crystal layer, and what the human eye sees is the superposition of green and red, that is, it shows yellow writing traces. In this way, the effect of adding annotations with writing traces of other colors is achieved. Of course, if voltages are applied to both the first liquid crystal layer and the second liquid crystal layer, the writing traces of both layers are erased, and there are no writing traces on the liquid crystal writing device, showing a green background color.
[0063] In this embodiment, by means of the green substrate, the effect of displaying white writing traces and being able to display writing traces of other colors can be achieved through the superposition of two layers of liquid crystal; not only is the manufacturing cost saved, but also the thickness of the liquid crystal writing device is reduced to a certain extent.
[0064] In this embodiment, the liquid crystal writing device can achieve one-key full erasure or partial erasure.
[0065] When implementing local erasure, the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer are respectively divided into multiple strip-shaped conductive regions that are insulated from each other by etching lines; the conductive regions on each conductive layer are parallel to each other; and, the conductive regions on the first conductive layer and the conductive regions on the second conductive layer are perpendicular to each other in space; the conductive regions on the third conductive layer and the conductive regions on the fourth conductive layer are perpendicular to each other in space. The overlapping part of the conductive regions on the first conductive layer and the second conductive layer in space forms the local erasure region corresponding to the first liquid crystal layer; the overlapping part of the conductive regions on the third conductive layer and the fourth conductive layer in space forms the local erasure region corresponding to the second liquid crystal layer.
[0066] In order not to affect the overall erasure effect, the etching lines on each conductive layer need to meet any one of the following requirements ①②③:
[0067] ① The etching lines on the first conductive layer completely coincide with the etching lines on the third conductive layer, and the etching lines on the second conductive layer completely coincide with the etching lines on the fourth conductive layer;
[0068] Or, the etching lines on the first conductive layer completely coincide with the etching lines on the fourth conductive layer, and the etching lines on the second conductive layer completely coincide with the etching lines on the third conductive layer.
[0069] Of course, a certain error may occur during the manufacturing process. Therefore, it is allowed that the etching lines on the two conductive layers do not completely coincide. The deviation between the two can be in the range of [-10%W min , 10%W min , where W min is the minimum width of the conductive region. At this time, it is very difficult for the human eye to distinguish the influence brought by this subtle deviation, so it will not affect the erasure effect.
[0070] For the convenience of clearly explaining the solution of this embodiment, hereinafter, it is taken as an example that the first conductive layer is divided into multiple horizontally parallel and insulated strip-shaped conductive regions, the second conductive layer is divided into multiple vertically parallel and insulated strip-shaped conductive regions; the third conductive layer is divided into multiple horizontally parallel and insulated strip-shaped conductive regions, and the fourth conductive layer is divided into multiple vertically parallel and insulated strip-shaped conductive regions for illustration.
[0071] At this time, it is necessary to ensure that the etching lines on the first conductive layer completely coincide with the etching lines on the third conductive layer, and the etching lines on the second conductive layer completely coincide with the etching lines on the fourth conductive layer. Figure 2The schematic diagram shows that the etching lines on the first conductive layer and the third conductive layer completely overlap. The red represents the etching line of the first conductive layer, and the blue represents the etching line of the third conductive layer. Their positions on their respective conductive layers correspond one by one, and the superimposed effect in space is completely overlapping. The same principle applies to the second conductive layer and the fourth conductive layer.
[0072] If the deviation of the etching line is too large, it may cause the display handwriting corresponding to a certain liquid crystal layer to be incompletely erased. As a result, when erasing white handwriting, other color handwritings may appear. For example: Figure 3 The schematic diagram of non - overlapping etching lines of two conductive layers is given; for Figure 3 the two local erasure regions corresponding to the first liquid crystal layer and the second liquid crystal layer circled in it, since the target erasure regions of the two layers of liquid crystal do not completely overlap, when locally erasing, the blue handwriting in the set area of one layer of liquid crystal is erased while the red handwriting in the corresponding area of the other layer of liquid crystal is partially erased. The un - erased red part of the handwriting and the green substrate reflect yellow, and the other remaining notes appear white.
[0073] ② The etching line on the first conductive layer coincides with part of the etching line on the third conductive layer, and the etching line on the second conductive layer coincides with part of the etching line on the fourth conductive layer;
[0074] Or, the etching line on the first conductive layer coincides with part of the etching line on the fourth conductive layer, and the etching line on the second conductive layer coincides with part of the etching line on the third conductive layer.
[0075] Similarly, a deviation is allowed. The deviation is within the range of [- 10%W min , 10%W min , and it will not affect the visual effect; W min is the minimum width of the conductive region.
[0076] In this case, the widths of the conductive regions divided on the first conductive layer and the second conductive layer should be greater than the widths of the conductive regions on the third conductive layer and the fourth conductive layer. And the width of the conductive region on the first conductive layer is an integer multiple of the width of the conductive region on the third conductive layer or the fourth conductive layer; the width of the conductive region on the second conductive layer is an integer multiple of the width of the conductive region on the third conductive layer or the fourth conductive layer. This can perform more refined local erasure on the writing handwriting formed on a single - layer liquid crystal layer (the second liquid crystal layer) to meet the requirement of refined erasure of annotations.
[0077] Similarly, taking the example where the first conductive layer is divided into a plurality of horizontally parallel and insulated strip-shaped conductive regions, the second conductive layer is divided into a plurality of vertically parallel and insulated strip-shaped conductive regions; the third conductive layer is divided into a plurality of horizontally parallel and insulated strip-shaped conductive regions, and the fourth conductive layer is divided into a plurality of vertically parallel and insulated strip-shaped conductive regions for illustration. Figure 4 A schematic diagram showing the coincidence of the etching lines on the first conductive layer and some of the etching lines on the third conductive layer is given. The red represents the etching lines of the first conductive layer, and the blue represents the etching lines of the third conductive layer. The width of the etching lines of the first conductive layer is an integer multiple of the width of the etching lines of the third conductive layer. Figure 5 A schematic diagram showing the local erasure regions corresponding to the first liquid crystal layer and the local erasure regions corresponding to the second liquid crystal layer is given. Here, the width of the etching lines of the first conductive layer is twice the width of the etching lines of the third conductive layer.
[0078] ③ Some of the etching lines on the third conductive layer coincide with some of the etching lines on the first conductive layer, and some of the etching lines on the fourth conductive layer coincide with some of the etching lines on the second conductive layer;
[0079] Alternatively, some of the etching lines on the third conductive layer coincide with some of the etching lines on the second conductive layer, and some of the etching lines on the fourth conductive layer coincide with some of the etching lines on the first conductive layer.
[0080] Similarly, a deviation is allowed, and the deviation is within the range of [-10%W min , 10%W min , which will not affect the visual effect; W min is the minimum width of the conductive region.
[0081] In this case, the widths of the conductive regions divided on the third conductive layer and the fourth conductive layer should be greater than the widths of the conductive regions on the first conductive layer and the second conductive layer, and moreover, the width of the conductive region on the third conductive layer is an integer multiple of the width of the conductive region on the first conductive layer or the second conductive layer; the width of the conductive region on the fourth conductive layer is an integer multiple of the width of the conductive region on the first conductive layer or the second conductive layer. This can perform more refined local erasure of the written handwriting formed on a single liquid crystal layer (the first liquid crystal layer) to meet the requirement of refined erasure of annotations.
[0082] Through the scheme of complete or partial coincidence of the etching lines on different conductive layers in this embodiment, it can ensure the local erasure effect of the written handwriting, avoid the situation of incomplete erasure or only partial color erasure due to the misalignment of the etching lines, and at the same time, it can also meet the requirement of refined erasure of a certain color of handwriting.
[0083] Embodiment 2
[0084] In one or more embodiments, a multicolor liquid crystal writing device is disclosed, which incorporates Figure 6 , specifically including: a first base layer 1, a first liquid crystal layer 3, a second base layer 5, a second liquid crystal layer 8, a third base layer 6, and a substrate 11 arranged in sequence from top to bottom; wherein, a first conductive layer 2 is provided on the surface of the first base layer close to the first liquid crystal layer, and a second conductive layer 4 is provided on the surface of the second base layer close to the first liquid crystal layer 4; a third conductive layer 7 is provided on the surface of the second base layer close to the second liquid crystal layer 8, and a fourth conductive layer 9 is provided on the surface of the third base layer 6 close to the second liquid crystal layer 8; one of the first liquid crystal layer 3 and the second liquid crystal layer 8 can reflect red, and the other can reflect blue, and the substrate is a green substrate.
[0085] The difference between this embodiment and the first embodiment is that in this embodiment, the second conductive layer and the third conductive layer are directly provided on both sides of the second base layer, thus eliminating the setting of one base layer and still achieving the technical effects of the present utility model, saving the manufacturing cost.
[0086] The other structures of this embodiment are exactly the same as those of the first embodiment and will not be described in detail.
[0087] Embodiment Three
[0088] In one or more embodiments, a multicolor liquid crystal writing device is disclosed, and the specific structure refers to Figure 1 , including: a first base layer 1, a first liquid crystal layer 3, a second base layer 5, a third base layer 6, a second liquid crystal layer 8, a fourth base layer 10, and a substrate 11 arranged in sequence from top to bottom; wherein, a first conductive layer 2 is provided on the surface of the first base layer 1 close to the first liquid crystal layer 3, and a second conductive layer 4 is provided on the surface of the second base layer 5 close to the first liquid crystal layer 3; a third conductive layer 7 is provided on the surface of the third base layer 6 close to the second liquid crystal layer 8, and a fourth conductive layer 9 is provided on the surface of the fourth base layer 10 close to the second liquid crystal layer 8.
[0089] In this embodiment, the first base layer, the first conductive layer, the first liquid crystal layer, the second conductive layer, the second base layer, the third base layer, the third conductive layer, the second liquid crystal layer, and the fourth conductive layer are all made of transparent materials; the first base layer, the second base layer, the third base layer, and the fourth base layer can all be made of PET film, and the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer can all be made of ITO film.
[0090] The fourth base layer can be made of a transparent material or a black film.
[0091] The specific connection method and working principle of each conductive layer with the driving circuit are the same as those in the first embodiment.
[0092] Both the first liquid crystal layer and the second liquid crystal layer are provided with bistable liquid crystals. In the first liquid crystal layer and the second liquid crystal layer, one of them can reflect blue, and the other can reflect yellow; the substrate is a black substrate, or the fourth base layer is a black film, or the fourth base layer is a transparent film, and a black film is provided between the fourth base layer and the substrate; in this way, the entire liquid crystal writing device can present a black background color.
[0093] In this embodiment, the yellow color refers to an optical band with a central wavelength in the range of 560 nm to 580 nm and a bandwidth greater than 100 nm.
[0094] Taking the example that the bistable liquid crystal in the first liquid crystal layer can reflect blue and the bistable liquid crystal in the second liquid crystal layer can reflect yellow, when writing a handwriting by applying pressure, without applying voltage to each conductive layer, since the first liquid crystal layer reflects blue, the second liquid crystal layer reflects yellow, and the substrate does not reflect any color, therefore, the color seen by the human eye is the superposition of blue and yellow, that is, it shows a silver-white writing handwriting; thus, a writing display effect of black background and white characters is formed, meeting the usage requirements of education, teaching, and office work.
[0095] In this case, if you want to display handwriting of other colors, for example, when a teacher wants to add annotations with handwriting of other colors during writing, at this time, you can choose to apply a set electric field to the writing handwriting position of the first liquid crystal layer. The applied electric field erases the blue handwriting formed on the first liquid crystal layer, and what the human eye sees is the yellow handwriting; similarly, you can also choose to apply a set electric field to the writing handwriting position of the second liquid crystal layer. The applied electric field erases the yellow handwriting formed on the second liquid crystal layer, and what the human eye sees is the blue handwriting. In this way, the effect of adding annotations with handwriting of other colors is achieved. Of course, if voltage is applied to both the first liquid crystal layer and the second liquid crystal layer, the handwriting on both layers will be erased, and there is no writing handwriting on the liquid crystal writing device, showing a black background color.
[0096] In this embodiment, the liquid crystal writing device can also achieve one-key full erasure and local erasure. When local erasure is realized, the specific design scheme of the etching line is the same as that in the first embodiment and will not be elaborated here.
[0097] Embodiment Four
[0098] In one or more embodiments, a multicolor liquid crystal writing device is disclosed, which can be combined Figure 2, specifically including: a first base layer 1, a first liquid crystal layer 3, a second base layer 5, a second liquid crystal layer 8, a third base layer 6, and a substrate 11 arranged in sequence from top to bottom; wherein, a first conductive layer 2 is provided on the surface of the first base layer 1 close to the first liquid crystal layer 3, and a second conductive layer 4 is provided on the surface of the second base layer 5 close to the first liquid crystal layer 3; a third conductive layer 7 is provided on the surface of the second base layer 5 close to the second liquid crystal layer 8, and a fourth conductive layer 9 is provided on the surface of the third base layer 6 close to the second liquid crystal layer 8;
[0099] Both the first liquid crystal layer and the second liquid crystal layer are provided with bistable liquid crystals. In the first liquid crystal layer and the second liquid crystal layer, one can reflect blue and the other can reflect yellow; the substrate is a black substrate, or the third base layer is a black film, or the third base layer is a transparent film, and a black film is provided between the third base layer and the substrate; thus, the entire liquid crystal writing device can present a black background color.
[0100] The difference between this embodiment and Embodiment 3 is that in this embodiment, the second conductive layer and the third conductive layer are directly provided on both sides of the second base layer, thus eliminating the setting of one base layer and still achieving the technical effects of the present invention, saving the manufacturing cost.
[0101] The other structures of this embodiment are exactly the same as those of Embodiment 3 and will not be described in detail.
[0102] Although the specific implementation manners of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.
Claims
1. A multi-color liquid crystal writing device, characterized in that: include: A first base layer, a first liquid crystal layer, a second base layer, a third base layer, a second liquid crystal layer, a fourth base layer and a substrate are sequentially arranged from top to bottom; wherein a first conductive layer is arranged on a side of the first base layer close to the first liquid crystal layer, and a second conductive layer is arranged on a side of the second base layer close to the first liquid crystal layer; a third conductive layer is arranged on a side of the third base layer close to the second liquid crystal layer, and a fourth conductive layer is arranged on a side of the fourth base layer close to the second liquid crystal layer; One of the first liquid crystal layer and the second liquid crystal layer can reflect red, and the other can reflect blue, and the substrate is a green substrate.
2. A multi-color liquid crystal writing device as claimed in claim 1, characterized in that: The first base layer, the first conductive layer, the second conductive layer, the second base layer, the third base layer, the third conductive layer, the fourth conductive layer and the fourth base layer are all made of transparent materials.
3. A multi-color liquid crystal writing device, characterized in that: include: A first base layer, a first liquid crystal layer, a second base layer, a second liquid crystal layer, a third base layer and a substrate are sequentially arranged from top to bottom; wherein a first conductive layer is arranged on a side of the first base layer close to the first liquid crystal layer, and a second conductive layer is arranged on a side of the second base layer close to the first liquid crystal layer; a third conductive layer is arranged on a side of the second base layer close to the second liquid crystal layer, and a fourth conductive layer is arranged on a side of the third base layer close to the second liquid crystal layer; One of the first liquid crystal layer and the second liquid crystal layer can reflect red, and the other can reflect blue, and the substrate is a green substrate.
4. A multi-color liquid crystal writing device as claimed in claim 1, characterized in that: The first base layer, the first conductive layer, the second conductive layer, the second base layer, the third conductive layer, the fourth conductive layer and the third base layer are all made of transparent materials.
5. A multi-color liquid crystal writing device as claimed in any one of claims 1 to 4, characterized in that: The first conductive layer, the second conductive layer, the third conductive layer and the fourth conductive layer are respectively divided into a plurality of mutually insulated strip-shaped conductive regions by etching lines; The etching lines on the first conductive layer and the etching lines on the third conductive layer completely overlap or the deviation is within [-10%W min , 10%W min ], the etching line on the second conductive layer completely overlaps with the etching line on the fourth conductive layer or the deviation is within [-10%W min , 10%W min ] within the scope; Alternatively, the etching line on the first conductive layer completely overlaps with the etching line on the fourth conductive layer or the deviation is within [-10%W min , 10%W min ], the etching line on the second conductive layer completely overlaps with the etching line on the third conductive layer or the deviation is within [-10%W min , 10%W min ] within the scope; Alternatively, the etching line on the first conductive layer overlaps with a portion of the etching line on the third conductive layer or the deviation is within [-10%W min , 10%W min ], the etching line on the second conductive layer overlaps with part of the etching line on the fourth conductive layer or the deviation is within [-10%W min , 10%W min ]; and, the width of the conductive region on the first conductive layer is an integer multiple of the width of the conductive region on the third conductive layer, and the width of the conductive region on the second conductive layer is an integer multiple of the width of the conductive region on the fourth conductive layer; Alternatively, the etching line on the first conductive layer overlaps with a portion of the etching line on the fourth conductive layer or the deviation is within [-10%W min , 10%W min ], the etching line on the second conductive layer overlaps with part of the etching line on the third conductive layer or the deviation is within [-10%W min , 10%W min ] range, and the width of the conductive region on the first conductive layer is an integer multiple of the width of the conductive region on the fourth conductive layer, and the width of the conductive region on the second conductive layer is an integer multiple of the width of the conductive region on the third conductive layer; Alternatively, the etching line on the third conductive layer overlaps with part of the etching line on the first conductive layer or the deviation is within [-10%W min , 10%W min ], the etching line on the fourth conductive layer overlaps with part of the etching line on the second conductive layer or the deviation is within [-10%W min , 10%W min ] range, and the width of the conductive region on the third conductive layer is an integer multiple of the width of the conductive region on the first conductive layer, and the width of the conductive region on the fourth conductive layer is an integer multiple of the width of the conductive region on the second conductive layer; Alternatively, the etching line on the third conductive layer overlaps with part of the etching line on the second conductive layer or the deviation is within [-10%W min , 10%W min ], the etching line on the fourth conductive layer overlaps with part of the etching line on the first conductive layer or the deviation is within [-10%W min , 10%W min ] range, and the width of the conductive region on the third conductive layer is an integer multiple of the width of the conductive region on the second conductive layer, and the width of the conductive region on the fourth conductive layer is an integer multiple of the width of the conductive region on the first conductive layer; W min is the minimum width of the conductive area.
6. A multi-color liquid crystal writing device as claimed in claim 5, characterized in that: The conductive areas on each conductive layer are parallel to each other; the conductive areas on the first conductive layer and the conductive areas on the second conductive layer are vertical to each other in space; the conductive areas on the third conductive layer and the conductive areas on the fourth conductive layer are vertical to each other in space.
7. A multi-color liquid crystal writing device, characterized in that: include: A first base layer, a first liquid crystal layer, a second base layer, a third base layer, a second liquid crystal layer, a fourth base layer and a substrate are sequentially arranged from top to bottom; wherein a first conductive layer is arranged on a side of the first base layer close to the first liquid crystal layer, and a second conductive layer is arranged on a side of the second base layer close to the first liquid crystal layer; a third conductive layer is arranged on a side of the third base layer close to the second liquid crystal layer, and a fourth conductive layer is arranged on a side of the fourth base layer close to the second liquid crystal layer; One of the first liquid crystal layer and the second liquid crystal layer can reflect blue, and the other can reflect yellow; the substrate is a black substrate, or the fourth base layer is a black film, or a black film is attached between the fourth base layer and the substrate.
8. A multi-color liquid crystal writing device, characterized in that: include: A first base layer, a first liquid crystal layer, a second base layer, a second liquid crystal layer, a third base layer and a substrate are sequentially arranged from top to bottom; wherein a first conductive layer is arranged on a side of the first base layer close to the first liquid crystal layer, and a second conductive layer is arranged on a side of the second base layer close to the first liquid crystal layer; a third conductive layer is arranged on a side of the second base layer close to the second liquid crystal layer, and a fourth conductive layer is arranged on a side of the third base layer close to the second liquid crystal layer; One of the first liquid crystal layer and the second liquid crystal layer can reflect blue, and the other can reflect yellow; the substrate is a black substrate, or the third base layer is a black film, or a black film is attached between the third base layer and the substrate.
9. A multi-color liquid crystal writing device as claimed in claim 7 or 8, characterized in that: The first conductive layer, the second conductive layer, the third conductive layer and the fourth conductive layer are respectively divided into a plurality of mutually insulated strip-shaped conductive regions by etching lines; The etching lines on the first conductive layer and the etching lines on the third conductive layer completely overlap or the deviation is within [-10%W min , 10%W min ], the etching line on the second conductive layer completely overlaps with the etching line on the fourth conductive layer or the deviation is within [-10%W min , 10%W min ] within the scope; Alternatively, the etching line on the first conductive layer completely overlaps with the etching line on the fourth conductive layer or the deviation is within [-10%W min , 10%W min ], the etching line on the second conductive layer completely overlaps with the etching line on the third conductive layer or the deviation is within [-10%W min , 10%W min ] within the scope; Alternatively, the etching line on the first conductive layer overlaps with a portion of the etching line on the third conductive layer or the deviation is within [-10%W min , 10%W min ], the etching line on the second conductive layer overlaps with part of the etching line on the fourth conductive layer or the deviation is within [-10%W min , 10%W min ]; and, the width of the conductive region on the first conductive layer is an integer multiple of the width of the conductive region on the third conductive layer, and the width of the conductive region on the second conductive layer is an integer multiple of the width of the conductive region on the fourth conductive layer; Alternatively, the etching line on the first conductive layer overlaps with a portion of the etching line on the fourth conductive layer or the deviation is within [-10%W min , 10%W min ], the etching line on the second conductive layer overlaps with part of the etching line on the third conductive layer or the deviation is within [-10%W min , 10%W min ] range, and the width of the conductive region on the first conductive layer is an integer multiple of the width of the conductive region on the fourth conductive layer, and the width of the conductive region on the second conductive layer is an integer multiple of the width of the conductive region on the third conductive layer; Alternatively, the etching line on the third conductive layer overlaps with part of the etching line on the first conductive layer or the deviation is within [-10%W min , 10%W min ], the etching line on the fourth conductive layer overlaps with part of the etching line on the second conductive layer or the deviation is within [-10%W min , 10%W min ] range, and the width of the conductive region on the third conductive layer is an integer multiple of the width of the conductive region on the first conductive layer, and the width of the conductive region on the fourth conductive layer is an integer multiple of the width of the conductive region on the second conductive layer; Alternatively, the etching line on the third conductive layer overlaps with part of the etching line on the second conductive layer or the deviation is within [-10%W min , 10%W min ], the etching line on the fourth conductive layer overlaps with part of the etching line on the first conductive layer or the deviation is within [-10%W min , 10%W min ] range, and the width of the conductive region on the third conductive layer is an integer multiple of the width of the conductive region on the second conductive layer, and the width of the conductive region on the fourth conductive layer is an integer multiple of the width of the conductive region on the first conductive layer; W min is the minimum width of the conductive area.
10. A multi-color liquid crystal writing device as claimed in claim 9, characterized in that: The conductive areas on each conductive layer are parallel to each other; the conductive areas on the first conductive layer and the conductive areas on the second conductive layer are vertical to each other in space; the conductive areas on the third conductive layer and the conductive areas on the fourth conductive layer are vertical to each other in space.