Polychromatic light regulation and control screen, polychromatic light regulation and control system and polychromatic light regulation and control method

Abstract

The invention relates to a polychromatic light regulation and control screen, a polychromatic light regulation and control system and a polychromatic light regulation and control method. The polychromatic light regulation and control screen comprises a plurality of liquid crystal films which are stacked; the liquid crystal film comprises a first conductive structure, a second conductive structure, a light response structure and a liquid crystal structure; and the liquid crystal structures of different liquid crystal films display different colors. The multi-color writing device has the advantages that multi-color writing can be achieved by means of the characteristics of the multi-layer liquid crystal structure and the light response structure, and the application range is wider; selective multi-color writing: the selection of specific colors can be realized by utilizing the cooperation of voltage and light irradiation signals; the whole system basically has no power consumption in a single-color writing mode, and physical extrusion induction and color development are carried out only by depending on the properties of liquid crystals; the multi-color light regulation and control screen mainly utilizes the physical property of cholesteric liquid crystal and the photoelectric property of a light response medium to carry out color development and erasing, no extra signal processing flow exists in a region, and the response is extremely fast.

Description

Technical Field

[0001] The present invention relates to the field of multi-color display technology, and in particular to a multi-color light control screen, a multi-color light control system and a multi-color light control method. Background Art

[0002] Blackboards and chalk are essential tools for teaching, making indelible contributions to education. However, traditional blackboards and chalk generate large amounts of dust during teaching, which can be harmful to the health of teachers and students. Therefore, a new technology is urgently needed to replace traditional blackboards and chalk.

[0003] Currently, there are two main types of technologies that can replace traditional blackboards. The first type uses a specific structure to sense the position of a specific stylus tip. Through its control system, the corresponding color is displayed, thereby generating handwriting information on the blackboard. These blackboard sensing methods can be categorized as resistive pressure sensing, electromagnetic pressure sensing, and capacitive touch sensing. Resistive pressure sensing consists of a deformable resistive film and a fixed resistive film. When pressure is applied to the blackboard surface, the deformable film contacts the fixed film at the pressure point, thereby sensing the position of the pen or finger. Electromagnetic pressure sensing utilizes the electromagnetic field generated by the blackboard's internal circuitry to detect the interaction between the stylus tip's inductive coil and the electromagnetic field to determine the tip's position. Capacitive touch sensing uses the body's capacitance to sense finger position. When a finger touches the tablet, capacitance is generated on the tablet surface. Using a sensor matrix and specialized chips, the blackboard continuously tracks the user's handwriting capacitance and accurately locates the finger's position. After determining the writing object's trajectory, this type of blackboard generates pattern information corresponding to the trajectory, achieving a writing experience similar to that of traditional paper. However, the accuracy of the handwriting traces generated on these blackboards depends on the accuracy of the sensors and the pixel density of the display. Furthermore, the process of sensing before displaying introduces a certain delay. High-speed and high-precision handwriting generation places higher demands on the tablet, which in turn increases its cost. Furthermore, at the same resolution, the larger the blackboard, the higher the cost.

[0004] The second type of blackboard technology integrates sensing and display, creating a writing experience more similar to that of traditional paper. Liquid crystal blackboards are a prime example of this type of blackboard. LCD blackboards have a simpler structure, eliminating the need for complex sensing and control circuitry. Their sensing and display capabilities rely solely on the physical properties of bistable liquid crystals, which can maintain two states: "transparent" and "opaque" in the absence of external influences. When the liquid crystals within the entire screen are in the "transparent" state, no handwriting is displayed. However, when a stylus is written on the screen, the physical compression changes the local state of the liquid crystals, revealing the handwriting. Applying a specific voltage signal to the liquid crystal surface causes the liquid crystals to return to the "transparent" state, erasing the handwriting. LCD blackboards rely on the intrinsic physical properties of liquid crystals for both sensing and display, resulting in a simple structure and low power consumption. Furthermore, the handwriting on an LCD blackboard is composed not of pixels as in the first type of blackboard technology, but rather of individual liquid crystal cells in an "opaque" state, making it easy to achieve ultra-high resolution.

[0005] LCD blackboards offer significant advantages over first-class tablets in terms of cost, power consumption, and resolution, but they also have certain drawbacks. First-class tablets separate sensing and display, relying more on program control and making partial erasure easier. LCD blackboards, however, rely on the physical properties of their materials, allowing for full-page refreshes through a single, integrated bias. However, they face challenges with multi-color writing. Currently, virtually all LCD tablets on the market are unable to support multiple colors in the same area.

[0006] Currently, no effective solution has been proposed for the problem that multiple-color writing cannot be achieved in related technologies. Summary of the Invention

[0007] The purpose of the present invention is to address the deficiencies in the prior art and provide a multi-color light control screen, a multi-color light control system for a multi-color light control screen, and a multi-color light control method, so as to solve the problems existing in the related art such as the inability to achieve multi-color writing.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] In a first aspect, a multi-color light control screen is provided, comprising:

[0010] A plurality of liquid crystal films, wherein the plurality of liquid crystal films are stacked;

[0011] Wherein, the liquid crystal film comprises:

[0012] a first conductive structure;

[0013] a second conductive structure, the second conductive structure being arranged opposite to the first conductive structure;

[0014] a light-responsive structure, the light-responsive structure being disposed between the first conductive structure and the second conductive structure, and configured to be in a non-conductive state when no light illumination signal is received and in a conductive state when a light illumination signal is received;

[0015] a liquid crystal structure, wherein the liquid crystal structure is disposed between the first conductive structure and the second conductive structure, the liquid crystal structure is located on a side of the light-responsive structure, the liquid crystal structure is located inside the light-responsive structure, or the liquid crystal structure and the light-responsive structure are integrally formed;

[0016] Wherein, the liquid crystal structures of different liquid crystal films display different colors;

[0017] Among them, when the multi-color light control screen is in multi-color writing mode, at least one of the liquid crystal films is not applied with voltage; when the multi-color light control screen receives a light irradiation signal or a pressure signal, one or several of the liquid crystal films that are not applied with voltage display color.

[0018] In some embodiments, the first conductive structure includes:

[0019] A first conductive layer, wherein the first conductive layer and the second conductive structure are arranged opposite to each other, and the light-responsive structure and the liquid crystal structure are arranged between the first conductive layer and the second conductive structure.

[0020] In some embodiments, the first conductive structure further includes:

[0021] The first base layer is arranged on a side of the first conductive layer away from the second conductive structure.

[0022] In some embodiments, the second conductive structure includes:

[0023] A second conductive layer is provided opposite to the first conductive structure, and the light-responsive structure and the liquid crystal structure are provided between the second conductive layer and the first conductive structure.

[0024] In some embodiments, the second conductive structure further includes:

[0025] The second base layer is arranged on a side of the second conductive layer away from the first conductive structure.

[0026] In some embodiments, the photoresponsive structure comprises:

[0027] A first photoresponsive layer is disposed between the first conductive structure and the liquid crystal structure.

[0028] In some embodiments, the photoresponsive structure comprises:

[0029] A second photoresponsive layer is disposed between the second conductive structure and the liquid crystal structure.

[0030] In a second aspect, a multi-color light control system is provided, comprising:

[0031] The multi-color light control screen as described in the first aspect.

[0032] In some embodiments, further comprising:

[0033] A control device is connected to the multi-color light regulating screen and is used to adjust the voltage applied to the multi-color light regulating screen.

[0034] In some embodiments, further comprising:

[0035] A writing device transmits a light irradiation signal and / or a pressure signal to the multi-color light regulating screen so as to perform a writing operation and an erasing operation on the multi-color light regulating screen.

[0036] In a third aspect, a multi-color light control method is provided, which is applied to the multi-color light control screen as described in the first aspect or the multi-color light control system as described in the second aspect, comprising:

[0037] Obtaining a first voltage regulation instruction;

[0038] adjusting the voltage applied to at least one of the liquid crystal films according to the first voltage adjustment instruction, so that the multi-color light control screen is in a multi-color writing mode;

[0039] When the multi-color light regulating screen is in the multi-color writing mode, determining whether the multi-color light regulating screen receives a light irradiation signal and a pressure signal;

[0040] When the multi-color light control screen receives the light irradiation signal and the pressure signal, the multi-color light control screen displays writing handwriting with a preset color corresponding to the light irradiation signal and the pressure signal.

[0041] In some embodiments, after determining whether the multi-color light control screen receives the light illumination signal and the pressure signal, the method further includes:

[0042] When the multi-color light control screen receives only the pressure signal, the multi-color light control screen displays writing with a preset color corresponding to the pressure signal, wherein the preset color is a superposition of the colors of all the liquid crystal films displayed.

[0043] In some embodiments, further comprising:

[0044] obtaining a second voltage regulation instruction;

[0045] adjusting the voltage applied to all the liquid crystal films according to the second voltage adjustment instruction so that the multi-color light control screen is in a partial erasing mode;

[0046] When the multi-color light regulating screen is in the partial erasing mode, determining whether the multi-color light regulating screen receives a light illumination signal;

[0047] When the multi-color light control screen receives the light illumination signal, determining an illumination range of the received light illumination signal;

[0048] Classifying the multi-color light control screen into erasable areas and non-erasable areas according to the irradiation range;

[0049] The handwriting in the erasable area is erased, and the handwriting in the non-erasable area is retained.

[0050] In some embodiments, further comprising:

[0051] obtaining a third voltage regulation instruction;

[0052] adjusting the voltage applied to all the liquid crystal films according to the third voltage adjustment instruction so that the multi-color light control screen is in a global erasing mode;

[0053] When the multi-color light control screen is in the global erasing mode, the handwriting on the multi-color light control screen is erased.

[0054] Compared with the prior art, the multi-color light control screen, the method for preparing the multi-color light control screen, the multi-color light control system and the square light control method of the present invention have the following technical effects:

[0055] 1) Multi-color writing: Multi-color writing can be achieved by relying on the characteristics of multi-layer liquid crystal structure and light-responsive structure, which has a wider range of applications;

[0056] 2) Selective multi-color writing: Specific colors can be selected by combining voltage and light irradiation signals;

[0057] 3) Low system power consumption: In monochrome writing mode, the entire system consumes almost no power, relying solely on the properties of the liquid crystal itself for physical squeezing sensing and color display;

[0058] 4) Fast response: The multi-color light control screen mainly utilizes the physical properties of cholesteric liquid crystal itself and the optoelectronic properties of the light-responsive medium for color display and erasure. There is no additional regional signal processing process, and the response is extremely fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 is a cross-sectional view of a multi-color light control screen according to an embodiment of the present invention (I);

[0060] Figure 2 is a cross-sectional view (2) of a multi-color light control screen according to an embodiment of the present invention;

[0061] Figure 3 is a framework diagram of a multi-color light control system according to an embodiment of the present invention;

[0062] Figure 4 is a flow chart (1) of a multi-color light control method according to an embodiment of the present invention;

[0063] Figure 5 is a flow chart (II) of the multi-color light control method according to an embodiment of the present invention;

[0064] Figure 6 Flowchart (3) of the multi-color light control method according to an embodiment of the present invention.

[0065] The accompanying drawings are numerals 100, liquid crystal film; 110, first conductive structure; 111, first base layer; 112, first conductive layer; 120, second conductive structure; 121, second base layer; 122, second conductive layer; 130, photoresponsive structure; 131, first photoresponsive layer; 132, second photoresponsive layer; 140, liquid crystal structure;

[0066] A. Multi-color light control screen; B. Control device; C. Writing device. DETAILED DESCRIPTION

[0067] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention, combined with the accompanying drawings. Obviously, the described embodiments represent only a portion of the embodiments of the present invention, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0068] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0069] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0070] Example 1

[0071] This embodiment relates to the multi-color light control screen of the present invention.

[0072] An exemplary embodiment of the present invention. Figures 1 and 2 As shown, a multi-color light-control screen includes a plurality of liquid crystal films 100. The plurality of liquid crystal films 100 are stacked and include a first conductive structure 110, a second conductive structure 120, a light-responsive structure 130, and a liquid crystal structure 140. The second conductive structure 120 is disposed opposite the first conductive structure 110; the light-responsive structure 130 is disposed between the first conductive structure 110 and the second conductive structure 120, and is configured to be non-conductive when not receiving a light illumination signal and conductive when receiving a light illumination signal; and the liquid crystal structure 140 is disposed between the first conductive structure 110 and the second conductive structure 120. The liquid crystal structure 140 may be located to the side of the light-responsive structure 130, or within the light-responsive structure 130, or the liquid crystal structure 140 and the light-responsive structure 130 may be integrally formed.

[0073] The liquid crystal structures 140 of different liquid crystal films 100 display different colors.

[0074] Among them, when the multi-color light control screen is in multi-color writing mode, at least one liquid crystal film 100 is not applied with voltage; when the multi-color light control screen receives light irradiation signals and pressure signals, one or more liquid crystal films 100 that are not applied with voltage display color.

[0075] In the present invention, the number of colors displayed by the multi-color light control screen is related to the number of liquid crystal films 100. If the number of liquid crystal films 100 is n, the combination formula is: The number of colors displayed on the multi-color light control screen is m, then m=C(n,1)+C(n,2)+C(n,3)+…+C(n,n-1)+C(n,n).

[0076] The wavelength of light is 200nm to 2000nm, which means that light includes ultraviolet light, visible light, and infrared light.

[0077] The working principle of the present invention is as follows:

[0078] The multi-color light control screen includes multi-color writing mode, local erase mode and global erase mode;

[0079] When the multi-color light control screen is in the multi-color writing mode, no voltage is applied to at least one liquid crystal film 100, and the color displayed by the multi-color light control screen is the superposition of the colors displayed by all the color-developing liquid crystal films 100;

[0080] When the multi-color light control screen is in the partial erasing mode, it has the following two states: when no light illumination signal is received, the light response structures 130 of all liquid crystal films 100 are in a non-conductive state. At this time, regardless of whether a voltage is applied to the liquid crystal film 100 or whether the direction of the voltage applied to the liquid crystal film 100 is adjusted, the electric field strength of the liquid crystal film 100 is limited; when a light illumination signal is received, the light response structures 130 of all liquid crystal films 100 are in a conductive state. At this time, the electric field strength of the liquid crystal film 100 is enhanced, and the liquid crystal film 100 can be operated;

[0081] When the multi-color light control screen is in the global erasing mode, voltage is applied to all liquid crystal films 100 .

[0082] More specifically, when the multi-color light-regulating screen is in multi-color writing mode, if the liquid crystal film 100 does not receive a light irradiation signal, regardless of whether a voltage is applied to the liquid crystal film 100, as long as the liquid crystal film 100 senses a pressure signal, all liquid crystal films 100 will display color. If the liquid crystal film 100 receives a light irradiation signal, the liquid crystal films 100 to which a voltage is applied will not display color, while the liquid crystal films 100 to which a voltage is not applied will display color. In other words, the multi-color light-regulating screen has the following implementations:

[0083] (1) Voltage is applied to the liquid crystal film 100:

[0084] 1) No light irradiation signal, no pressure signal: no color;

[0085] 2) With light signal but no pressure signal: no color display;

[0086] 3) With light signal and pressure signal: no color display;

[0087] 4) No light signal, pressure signal: color display;

[0088] (2) No voltage is applied to the liquid crystal film 100:

[0089] 1) No light irradiation signal, no pressure signal: no color;

[0090] 2) With light signal but no pressure signal: no color display;

[0091] 3) With light signal and pressure signal: color display;

[0092] 4) No light signal, with pressure signal: color display.

[0093] More specifically, when the multi-color light-regulating screen is in partial erasure mode, if the liquid crystal film 100 does not receive a light irradiation signal, all liquid crystal films 100 display color as long as they sense a pressure signal. If the liquid crystal film 100 receives a light irradiation signal, all liquid crystal films 100 do not display color. In other words, the multi-color light-regulating screen has the following implementations:

[0094] (1) Voltage is applied to the liquid crystal film 100:

[0095] 1) No light irradiation signal, no pressure signal: no color;

[0096] 2) With light signal but no pressure signal: no color display;

[0097] 3) With light signal and pressure signal: no color display;

[0098] 4) No light signal, pressure signal: color display;

[0099] (2) No voltage is applied to the liquid crystal film 100:

[0100] 1) No light irradiation signal, no pressure signal: no color;

[0101] 2) With light signal but no pressure signal: no color display;

[0102] 3) With light signal and pressure signal: no color display;

[0103] 4) No light signal, with pressure signal: color display.

[0104] In the present invention, there is no limit to the size of the multi-color light control screen. Specifically, the size of the multi-color light control screen is 5 inches to 200 inches, including but not limited to 5.4 inches, 7.9 inches, 8.3 inches, 9.7 inches, 10.2 inches, 10.5 inches, 10.9 inches, 11 inches, 12.9 inches, 14 inches, 16 inches, 21.5 inches, 24 inches, 27 inches, 32 inches, 43 inches, 48 inches, 50 inches, 55 inches, 65 inches, 75 inches, 85 inches, 100 inches, 148 inches, and 168 inches.

[0105] In the present invention, the multi-color light control screen can be used for a handwriting board, a display screen, and an electronic blackboard.

[0106] In this embodiment, there are four implementation methods as follows:

[0107] 1) The liquid crystal structure 140 is disposed between the second conductive structure 120 and the light-responsive structure 130;

[0108] 2) The liquid crystal structure 140 is disposed between the first conductive structure 110 and the light-responsive structure 130;

[0109] 3) If Figure 1 As shown, the liquid crystal structure 140 is disposed inside the light-responsive structure 130;

[0110] 4) If Figure 2 As shown, the liquid crystal structure 140 and the light-responsive structure 130 are integrally formed.

[0111] like Figures 1 and 2 As shown, the first conductive structure 110 includes a first base layer 111 and a first conductive layer 112 , wherein the first conductive layer 112 is disposed on a side of the first base layer 111 close to the second conductive structure 120 .

[0112] The first base layer 111 is made of a light-transmitting material, including but not limited to a flexible material and a non-flexible material, such as glass, plastic film, PET, etc.

[0113] In some embodiments, the first base layer 111 is a light-colored material or a dark-colored material.

[0114] When the first base layer 111 is made of a light-colored material, the light transmittance of the first base layer 111 is 15% to 90%.

[0115] Preferably, the light transmittance of the first base layer 111 is 30% to 90%. More preferably, the light transmittance of the first base layer 111 is 50% to 90%. More preferably, the light transmittance of the first base layer 111 is 75% to 90%.

[0116] When the first base layer 111 is made of a dark material, the light transmittance of the first base layer 111 is 0% to 80%.

[0117] Preferably, the light transmittance of the first base layer 111 is 0% to 60%. More preferably, the light transmittance of the first base layer 111 is 0% to 50%. More preferably, the light transmittance of the first base layer 111 is 0% to 35%.

[0118] The thickness of the first base layer 111 is not limited and is determined according to the requirements of the multi-color light control screen.

[0119] In some embodiments, the thickness of the first base layer 111 is 100 um to 1 cm.

[0120] The size of the first conductive layer 112 matches the size of the first base layer 111. Generally, the length of the first conductive layer 112 is equal to the length of the first base layer 111, and the width of the first conductive layer 112 is equal to the width of the first base layer 111.

[0121] The first conductive layer 112 is made of a conductive material, including but not limited to indium tin oxide (ITO), TCO conductive glass (FTO), polyethylene dioxythiophene (PEDOT), etc.

[0122] In some embodiments, the thickness of the first conductive layer 112 is 2 nm to 100 um.

[0123] In some embodiments, the preparation method of the first conductive structure 110 includes: forming a first conductive layer 112 on the surface of the first base layer 111 by any one or more combinations of magnetron sputtering, ion plating, electron beam evaporation, thermal evaporation, electrochemical deposition, coating and printing.

[0124] In some embodiments, a 125 μm PET film is used as the first base layer 111 , and a 200 nm ITO layer is sputtered on the surface of the first base layer 111 in an inert gas (argon) atmosphere using magnetron sputtering technology to form a first conductive layer 112 .

[0125] like Figures 1 and 2 As shown, the second conductive structure 120 includes a second base layer 121 and a second conductive layer 122 , wherein the second conductive layer 122 is disposed on a side of the second base layer 121 close to the first conductive structure 110 .

[0126] Specifically, the second conductive layer 122 is disposed on a side of the second base layer 121 close to the first conductive layer 112 .

[0127] The second base layer 121 may be made of materials including, but not limited to, flexible materials and non-flexible materials, such as glass, plastic film, PET, and the like.

[0128] In some embodiments, the second base layer 121 is a light-colored material or a dark-colored material.

[0129] When the second base layer 121 is made of a light-colored material, the light transmittance of the second base layer 121 is 15% to 90%.

[0130] Preferably, the light transmittance of the second base layer 121 is 30% to 90%. More preferably, the light transmittance of the second base layer 121 is 50% to 90%. More preferably, the light transmittance of the second base layer 121 is 75% to 90%.

[0131] When the second base layer 121 is made of a dark material, the light transmittance of the second base layer 121 is 0% to 80%.

[0132] Preferably, the light transmittance of the second base layer 121 is 0% to 60%. More preferably, the light transmittance of the second base layer 121 is 0% to 50%. More preferably, the light transmittance of the second base layer 121 is 0% to 35%.

[0133] Regarding the first base layer 111 and the second base layer 121 , at least one of the first base layer 111 and the second base layer 121 is made of a light-colored material.

[0134] The size of the second base layer 121 matches the size of the first base layer 111. Generally, the length of the second base layer 121 is equal to the length of the first base layer 111, and the width of the second base layer 121 is equal to the width of the first base layer 111.

[0135] The thickness of the second base layer 121 is not limited and is determined according to the requirements of the multi-color light control screen.

[0136] In some embodiments, the thickness of the second base layer 121 is 100 um to 1 cm.

[0137] The size of the second conductive layer 122 matches the size of the second base layer 121. Generally, the length of the second conductive layer 122 is equal to the length of the second base layer 121, and the width of the second conductive layer 122 is equal to the width of the second base layer 121.

[0138] The second conductive layer 122 is made of a transparent conductive material, including but not limited to indium tin oxide (ITO), TCO conductive glass (FTO), polyethylene dioxythiophene (PEDOT), etc.

[0139] In some embodiments, the thickness of the second conductive layer 122 is 2 nm to 100 um.

[0140] In some embodiments, the preparation method of the second conductive structure 120 includes: forming a second conductive layer 122 on the surface of the second base layer 121 by any one or more combinations of magnetron sputtering, ion plating, electron beam evaporation, thermal evaporation, electrochemical deposition, coating and printing.

[0141] In some embodiments, a 125 μm PET film is used as the second base layer 121 , and a 200 nm ITO layer is sputtered to form the second conductive layer 122 in the presence of an inert gas (argon) by using magnetron sputtering technology.

[0142] like Figure 1 As shown, the photoresponsive structure 130 includes a first photoresponsive layer 131 , wherein the first photoresponsive layer 131 is disposed between the first conductive structure 110 and the liquid crystal structure 140 .

[0143] Specifically, the first photoresponsive layer 131 is disposed between the first conductive layer 112 and the liquid crystal structure 140 .

[0144] The size of the first photoresponsive layer 131 matches the size of the first conductive layer 112. Generally, the length of the first photoresponsive layer 131 is equal to the length of the first conductive layer 112, and the width of the first photoresponsive layer 131 is equal to the width of the first conductive layer 112.

[0145] The first photoresponsive layer 131 is made of a photosensitive material, or a material that forms a rectifying structure with the first conductive layer 112, such as a PN junction or a Schottky junction, for example, titanium dioxide, gallium nitride, zinc oxide, perovskite, mercury cadmium telluride, etc.

[0146] The thickness of the first light response layer 131 is not limited and is determined according to the requirements of the multi-color light control screen.

[0147] In some embodiments, the thickness of the first photoresponsive layer 131 is 2 nm to 100 um.

[0148] like Figure 1 As shown, the photoresponsive structure 130 includes a second photoresponsive layer 132 , wherein the second photoresponsive layer 132 is disposed between the second conductive structure 120 and the liquid crystal structure 140 .

[0149] Specifically, the second photoresponsive layer 132 is disposed between the second conductive layer 122 and the liquid crystal structure 140 .

[0150] The size of the second photoresponsive layer 132 matches the size of the second conductive layer 122. Generally, the length of the second photoresponsive layer 132 is equal to the length of the second conductive layer 122, and the width of the second photoresponsive layer 132 is equal to the width of the second conductive layer 122.

[0151] The second photoresponsive layer 132 is made of a photosensitive material, or a material that forms a rectifying structure with the second conductive layer 122, such as a PN junction or a Schottky junction, for example, titanium dioxide, gallium nitride, zinc oxide, perovskite, mercury cadmium telluride, etc.

[0152] The thickness of the second light-responsive layer 132 is not limited and is determined according to the requirements of the multi-color light control screen.

[0153] In some embodiments, the thickness of the second photoresponsive layer 132 is 2 nm to 100 um.

[0154] In some embodiments, the preparation method of the photoresponsive structure 130 includes: forming a first photoresponsive layer 131 on the surface of the first conductive layer 112 by any one or more combinations of magnetron sputtering, ion plating, electron beam evaporation, thermal evaporation, electrochemical deposition, coating and printing; or forming a second photoresponsive layer 132 on the surface of the second conductive layer 122 by any one or more combinations of magnetron sputtering, ion plating, electron beam evaporation, thermal evaporation, electrochemical deposition, coating and printing.

[0155] In some of the embodiments, magnetron sputtering technology is used to form a 100 nm zinc oxide layer as the first photoresponse layer 131 by sputtering on the surface of the first conductive layer 112 in a mixed atmosphere of oxygen and argon (4:71), or a 100 nm zinc oxide layer as the second photoresponse layer 132 by sputtering on the surface of the second conductive layer 122.

[0156] like Figures 1 and 2 As shown, the liquid crystal structure 140 is arranged between the first conductive layer 112 and the second conductive layer 122, and is located on one side of the first photoresponsive layer 131, or on one side of the second photoresponsive layer 132, or between the first photoresponsive layer 131 and the second photoresponsive layer 132, or is integrally formed with the photoresponsive structure 130.

[0157] When the liquid crystal structure 140 is located on one side of the first photoresponsive layer 131 and / or one side of the second photoresponsive layer 132, the size of the liquid crystal structure 140 matches the size of the first photoresponsive layer 131 / the second photoresponsive layer 132. Generally, the length of the liquid crystal structure 140 is no greater than the length of the first photoresponsive layer 131 / the second photoresponsive layer 132, and the width of the liquid crystal structure 140 is no greater than the width of the first photoresponsive layer 131 / the second photoresponsive layer 132.

[0158] The liquid crystal structure 140 is made of liquid crystal material, such as cholesteric liquid crystal material.

[0159] The thickness of the liquid crystal structure 140 is not limited and is determined according to the requirements of the multi-color light control screen.

[0160] In some embodiments, the thickness of the liquid crystal structure 140 is 10 nm to 100 um.

[0161] In some embodiments, the liquid crystal paste is evenly distributed between the first light-responsive layer 131 and the second conductive layer 122, or between the first conductive layer 112 and the second light-responsive layer 132, by extrusion coating, pouring, or other common methods, and then cured (such as by UV curing) and sealed (such as by using UV curing glue or other adhesives).

[0162] In some embodiments, the liquid crystal paste includes liquid crystal (such as cholesteric liquid crystal), spacers, prepolymers, and photoinitiators.

[0163] In some embodiments, the liquid crystal paste is prepared as follows:

[0164] Liquid crystal (such as cholesteric liquid crystal), prepolymer, and photoinitiator are stirred and mixed at 40° C. in a mass ratio of 70:28:2 for 5 hours to obtain a mixed slurry;

[0165] 0.4% by mass of 500 nm spacers were mixed with the mixed paste to obtain a liquid crystal paste.

[0166] In some embodiments, the photoresponsive medium is mixed with a liquid crystal paste, so that the photoresponsive structure 130 and the liquid crystal structure 140 are integrally formed.

[0167] In some embodiments, the mass ratio of the photoresponsive medium to the liquid crystal paste is 0.4%.

[0168] In some of these embodiments,

[0169] The method of using the multi-color light control screen of the present invention is as follows:

[0170] 1) Monochrome writing mode

[0171] Without applying voltage to all the liquid crystal films 100, under physical squeezing, the liquid crystal structures 140 of all the liquid crystal films 100 of the multi-color light control screen display colors simultaneously, and the color of the handwriting is the superposition of the colors of all the liquid crystal films 100.

[0172] 2) Multi-color writing mode

[0173] A low-voltage pulse or a DC low voltage is applied to at least one liquid crystal film 100, and no voltage is applied to at least one liquid crystal film 100. Under the combined action of special wavelength light (i.e., light irradiation signal) and physical squeezing (i.e., pressure signal), the liquid crystal film 100 to which no voltage is applied displays color, while the liquid crystal film 100 to which voltage is applied does not display color. The color of the handwriting is the superposition of the colors of all the liquid crystal films 100 that have displayed color.

[0174] 3) Partial erase mode

[0175] A low-voltage pulse or a low DC voltage is applied to all the liquid crystal films 100. In the absence of light of the corresponding wavelength, the photoresponsive structures 130 of all the liquid crystal films 100 act as an insulator, and the written handwriting cannot be erased. In the presence of light of the corresponding wavelength, the irradiated area of the photoresponsive structure 130 is turned on, and the written handwriting is erased.

[0176] 4) Global Erase Mode

[0177] By applying a high voltage pulse or a DC high voltage to all the liquid crystal films 100, all the written handwriting is erased.

[0178] The technical effects of the present invention are as follows:

[0179] 1) Multi-color writing: Multi-color writing can be achieved by relying on the characteristics of multi-layer liquid crystal structure and light-responsive structure, which has a wider range of applications;

[0180] 2) Selective multi-color writing: Specific colors can be selected by combining voltage and light irradiation signals;

[0181] 3) Low system power consumption: In monochrome writing mode, the entire system consumes almost no power, relying solely on the properties of the liquid crystal itself for physical squeezing sensing and color display;

[0182] 4) Fast response: The multi-color light control screen mainly utilizes the physical properties of cholesteric liquid crystal itself and the optoelectronic properties of the light-responsive medium for color display and erasure. There is no additional regional signal processing process, and the response is extremely fast.

[0183] 3) Multi-color writing: Multi-color writing can be achieved by relying on the characteristics of multi-layer liquid crystal structure and light-responsive structure, which has a wider range of applications.

[0184] Example 2

[0185] This embodiment relates to the multi-color light control system of the present invention.

[0186] An exemplary embodiment of the present invention. Figure 3 As shown, a multi-color light control system includes the multi-color light control screen A as described in Example 1.

[0187] Furthermore, the multi-color light control system further includes a control device B. The control device B is connected to the multi-color light control screen A and is used to adjust the voltage applied to the multi-color light control screen A.

[0188] Specifically, the control device B is connected to at least the first conductive structure 110 and the second conductive structure 120 , and is used to adjust the voltage applied to the first conductive structure 110 and the second conductive structure 120 .

[0189] More specifically, the control device B is connected to at least the first conductive layer 112 and the second conductive layer 122 , and is configured to adjust the voltage applied to the first conductive layer 112 and the second conductive layer 122 .

[0190] Control device B has the following working modes:

[0191] 1) The control device B directly controls the multi-color light control screen A to put the multi-color light control screen A into a writing mode or an erasing mode, for example, by switching the control key;

[0192] 2) The control device B obtains a control signal from the outside to put the multi-color light control screen A into the writing mode or the erasing mode, for example, by obtaining the control signal through a wireless connection.

[0193] The control device B at least includes a control circuit, a power module, and a drive module. The power module is connected to the control circuit; the drive module is connected to the control circuit, the first conductive layer 112, and the second conductive layer 122 respectively.

[0194] In some embodiments, the control circuit includes but is not limited to a single chip microcomputer and a low power consumption circuit.

[0195] In some embodiments, the driving module includes but is not limited to logic gate circuits, chips, etc., such as STC and STM.

[0196] Furthermore, the control device B further includes a communication module, wherein the communication module is connected to the control circuit and is used to communicate with the outside world.

[0197] In some embodiments, the communication module includes but is not limited to a Bluetooth sensor, an antenna, etc., such as a SKYLAB Bluetooth module and a 2.4G wireless module.

[0198] Furthermore, the multi-color light control system further includes a writing device C. The writing device C transmits a light irradiation signal and / or a pressure signal to the multi-color light control screen A to perform writing and erasing operations on the multi-color light control screen A.

[0199] The wavelength of light is 200nm to 2000nm.

[0200] In some embodiments, the writing device C is further connected to the control device B for sending a control signal to the control device B so as to switch the operating mode of the multi-color light control screen A.

[0201] The writing device C at least includes a light emitting module, which emits a light irradiation signal to the multi-color light control screen A to change the state of the light response structure 130 of the multi-color light control screen A.

[0202] The technical effects of the present invention are basically the same as those of Example 1 and will not be described in detail here.

[0203] Example 3

[0204] This embodiment relates to the multi-color light control method of the present invention.

[0205] An exemplary embodiment of the present invention is as follows Figure 4 As shown, a multi-color light control method includes:

[0206] Step S402: obtaining a first voltage regulation instruction;

[0207] Step S404: adjusting the voltage applied to at least one liquid crystal film according to the first voltage adjustment instruction, so that the multi-color light control screen is in a multi-color writing mode;

[0208] Step S406: When the multi-color light control screen is in the multi-color writing mode, determining whether the multi-color light control screen receives a light irradiation signal and a pressure signal;

[0209] Step S408: When the multi-color light control screen receives the light illumination signal and the pressure signal, the multi-color light control screen displays the writing handwriting with the preset color corresponding to the light illumination signal and the pressure signal.

[0210] In step S402, the first voltage adjustment instruction includes applying a low-voltage pulse or a DC low voltage to at least one liquid crystal film, or not applying a low-voltage pulse or a DC low voltage to at least one liquid crystal film. Specifically, it includes the following forms:

[0211] 1) No low voltage pulse or DC low voltage is applied to the entire liquid crystal film;

[0212] 2) At least one liquid crystal film is not applied with a low-voltage pulse or a DC low voltage, and at least one liquid crystal film is applied with a low-voltage pulse or a DC low voltage.

[0213] In step S404, when the multi-color light control screen is in the multi-color writing mode, the liquid crystal film to which voltage is applied has the following conditions:

[0214] 1) No light irradiation signal, no pressure signal: no color;

[0215] 2) With light signal but no pressure signal: no color display;

[0216] 3) With light signal and pressure signal: no color display;

[0217] 4) No light signal, with pressure signal: color display.

[0218] In step S404, when the multi-color light control screen is in the multi-color writing mode, the liquid crystal film to which no voltage is applied has the following conditions:

[0219] 1) No light irradiation signal, no pressure signal: no color;

[0220] 2) With light signal but no pressure signal: no color;

[0221] 3) With light signal and pressure signal: color display;

[0222] 4) No light signal, pressure signal: color display.

[0223] In step S408 , the color displayed by the multi-color light control screen is the superposition of the colors of all liquid crystal films to which no voltage is applied.

[0224] Furthermore, after step S406, the method further includes:

[0225] Step S410: When the multi-color light control screen receives only a pressure signal, the multi-color light control screen displays a writing with a preset color corresponding to the pressure signal, wherein the preset color is a superposition of the colors of all liquid crystal films that display the color.

[0226] Among them, step S410 and step S408 are parallel steps.

[0227] In step S410 , no matter whether voltage is applied to the liquid crystal films, all the liquid crystal films participate in color development.

[0228] Furthermore, if Figure 5 As shown, the multi-color light control method further includes:

[0229] Step S502: obtaining a second voltage adjustment instruction;

[0230] Step S504: adjusting the voltage applied to all liquid crystal films according to the second voltage adjustment instruction, so that the multi-color light control screen is in a partial erasing mode;

[0231] Step S506: When the multi-color light control screen is in the partial erasing mode, determining whether the multi-color light control screen receives a light illumination signal;

[0232] Step S508: When the multi-color light control screen receives a light illumination signal, determining an illumination range of the received light illumination signal;

[0233] Step S510: Classify the multi-color light control screen into erasable areas and non-erasable areas according to the irradiation range;

[0234] Step S512: Erasing the handwriting in the erasable area and retaining the handwriting in the non-erasable area.

[0235] In step S502 , the second voltage adjustment instruction is to apply a low voltage pulse or a DC low voltage to all liquid crystal films.

[0236] In step S504, when the multi-color light control screen is in the partial erasure mode, all liquid crystal films have the following conditions:

[0237] 1) No light irradiation signal, no pressure signal: no color;

[0238] 2) With light signal but no pressure signal: no color display;

[0239] 3) With light signal and pressure signal: no color display;

[0240] 4) No light signal, with pressure signal: color display.

[0241] Among them, steps S502 to S512 and steps S402 to S410 are parallel steps.

[0242] Furthermore, if Figure 6 As shown, the multi-color light control method further includes:

[0243] Step S602: obtaining a third voltage adjustment instruction;

[0244] Step S604: adjusting the voltage applied to all liquid crystal films according to the third voltage adjustment instruction, so that the multi-color light control screen is in a global erasing mode;

[0245] Step S606: When the multi-color light control screen is in the global erasing mode, erase the handwriting on the multi-color light control screen.

[0246] In step S602 , the third voltage adjustment instruction is to apply a high voltage pulse or a DC high voltage to all liquid crystal films.

[0247] Among them, steps S602 to S606 are parallel steps with steps S402 to S410 and steps S502 to S512.

[0248] The technical effects of the present invention are the same as those of Examples 1 and 2, and will not be described in detail here.

[0249] Example 4

[0250] This embodiment is a specific implementation of the present invention. In this embodiment, a multi-color light control screen including three liquid crystal films is used as an example for description.

[0251] A multi-color light control screen includes a first liquid crystal film, a second liquid crystal film, and a third liquid crystal film. The first liquid crystal film is used to display red; the second liquid crystal film is arranged below the first liquid crystal film and is used to display green; and the third liquid crystal film is arranged below the second liquid crystal film and is used to display blue.

[0252] The method of using this embodiment is as follows:

[0253] Multi-color light control screen is in multi-color writing mode:

[0254] 1) Voltage is applied to both the first and second liquid crystal films, while no voltage is applied to the third liquid crystal film. When the multi-color light control screen receives a light irradiation signal and a pressure signal, the first and second liquid crystal films do not display color, while the third liquid crystal film displays color, and the multi-color light control screen displays blue.

[0255] 2) Voltage is applied to both the first and third liquid crystal films, while no voltage is applied to the second liquid crystal film. When the multi-color light control screen receives a light irradiation signal and a pressure signal, the first and third liquid crystal films do not display color, while the second liquid crystal film displays color, and the multi-color light control screen displays green.

[0256] 3) Voltage is applied to both the second and third liquid crystal films, while no voltage is applied to the first liquid crystal film. When the multi-color light control screen receives the light irradiation signal and the pressure signal, the second and third liquid crystal films do not display color, while the first liquid crystal film displays color, and the multi-color light control screen displays red.

[0257] 4) A voltage is applied to the first liquid crystal film, while no voltage is applied to the second and third liquid crystal films. When the multi-color light control screen receives a light irradiation signal and a pressure signal, the first liquid crystal film does not display color, while the second and third liquid crystal films display color, and the multi-color light control screen displays a composite color of green and blue.

[0258] 5) A voltage is applied to the second liquid crystal film, while no voltage is applied to the first and third liquid crystal films. When the multi-color light control screen receives the light irradiation signal and the pressure signal, the second liquid crystal film does not display color, while the first and third liquid crystal films display color, and the multi-color light control screen displays a composite color of red and blue;

[0259] 6) A voltage is applied to the third liquid crystal film, while no voltage is applied to the first and second liquid crystal films. When the multi-color light control screen receives the light irradiation signal and the pressure signal, the third liquid crystal film does not display color, while the first and second liquid crystal films display color, and the multi-color light control screen displays a composite color of red and green.

[0260] 7) No voltage is applied to the first liquid crystal film, the second liquid crystal film, and the third liquid crystal film. When the multi-color light control screen receives light irradiation signals and pressure signals, the first liquid crystal film, the second liquid crystal film, and the third liquid crystal film display colors, and the multi-color light control screen displays a composite color of red, green, and blue.

[0261] The above description is only a preferred embodiment of the present invention and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-color light control screen, characterized in that: include: A plurality of liquid crystal films, wherein the plurality of liquid crystal films are stacked; Wherein, the liquid crystal film comprises: a first conductive structure; a second conductive structure, the second conductive structure being arranged opposite to the first conductive structure; a light-responsive structure, the light-responsive structure being disposed between the first conductive structure and the second conductive structure, and configured to be in a non-conductive state when no light illumination signal is received and in a conductive state when a light illumination signal is received; a liquid crystal structure, wherein the liquid crystal structure is disposed between the first conductive structure and the second conductive structure, the liquid crystal structure is located on a side of the light-responsive structure, the liquid crystal structure is located inside the light-responsive structure, or the liquid crystal structure and the light-responsive structure are integrally formed; Wherein, the liquid crystal structures of different liquid crystal films display different colors; Among them, when the multi-color light control screen is in multi-color writing mode, at least one of the liquid crystal films is not applied with voltage; when the multi-color light control screen receives a light irradiation signal or a pressure signal, one or several of the liquid crystal films that are not applied with voltage display color.

2. The multi-color light control screen according to claim 1, characterized in that: The first conductive structure includes: a first conductive layer, wherein the first conductive layer and the second conductive structure are arranged opposite to each other, and the light-responsive structure and the liquid crystal structure are arranged between the first conductive layer and the second conductive structure; and / or The second conductive structure includes: A second conductive layer is provided opposite to the first conductive structure, and the light-responsive structure and the liquid crystal structure are provided between the second conductive layer and the first conductive structure.

3. The multi-color light control screen according to claim 2, characterized in that: The first conductive structure further includes: a first base layer, the first base layer being arranged on a side of the first conductive layer away from the second conductive structure; and / or The second conductive structure further includes: The second base layer is arranged on a side of the second conductive layer away from the first conductive structure.

4. The multi-color light control screen according to claim 1, characterized in that: The photoresponsive structure comprises: A first photoresponsive layer, the first photoresponsive layer being disposed between the first conductive structure and the liquid crystal structure; and / or A second photoresponsive layer is disposed between the second conductive structure and the liquid crystal structure.

5. A multi-color light control system, characterized in that: include The multi-color light control screen according to any one of claims 1 to 4.

6. The multi-color light control system according to claim 5, characterized in that: Also includes: A control device is connected to the multi-color light regulating screen and is used to adjust the voltage applied to the multi-color light regulating screen.

7. The multi-color light control system according to claim 5 or 6, characterized in that: Also includes: A writing device transmits a light irradiation signal and / or a pressure signal to the multi-color light regulating screen so as to perform a writing operation and an erasing operation on the multi-color light regulating screen.

8. A multi-color light control method, applied to the multi-color light control screen according to any one of claims 1 to 4 or the multi-color light control system according to any one of claims 5 to 7, characterized in that: include: Obtaining a first voltage regulation instruction; adjusting the voltage applied to at least one of the liquid crystal films according to the first voltage adjustment instruction, so that the multi-color light control screen is in a multi-color writing mode; When the multi-color light regulating screen is in the multi-color writing mode, determining whether the multi-color light regulating screen receives a light irradiation signal and a pressure signal; When the multi-color light control screen receives the light irradiation signal and the pressure signal, the multi-color light control screen displays writing handwriting with a preset color corresponding to the light irradiation signal and the pressure signal.

9. The multi-color light control method according to claim 8, characterized in that: After determining whether the multi-color light control screen receives the light irradiation signal and the pressure signal, the method further includes: When the multi-color light control screen receives only the pressure signal, the multi-color light control screen displays writing with a preset color corresponding to the pressure signal, wherein the preset color is a superposition of the colors of all the liquid crystal films displayed.

10. The multi-color light control method according to claim 8 or 9, characterized in that: Also includes: obtaining a second voltage regulation instruction; adjusting the voltage applied to all the liquid crystal films according to the second voltage adjustment instruction so that the multi-color light control screen is in a partial erasing mode; When the multi-color light regulating screen is in the partial erasing mode, determining whether the multi-color light regulating screen receives a light illumination signal; When the multi-color light control screen receives the light illumination signal, determining an illumination range of the received light illumination signal; Classifying the multi-color light control screen into erasable areas and non-erasable areas according to the irradiation range; Erasing the handwriting in the erasable area and retaining the handwriting in the non-erasable area; or obtaining a third voltage regulation instruction; adjusting the voltage applied to all the liquid crystal films according to the third voltage adjustment instruction so that the multi-color light control screen is in a global erasing mode; When the multi-color light control screen is in the global erasing mode, the handwriting on the multi-color light control screen is erased.

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