Liquid crystal handwriting device

Abstract

The present invention discloses a liquid crystal handwriting device, comprising a light source, a first base layer, a second base layer and a guest-host dyed liquid crystal layer arranged between the first base layer and the second base layer, wherein a first conductive layer is arranged on a side of the first base layer close to the second base layer, a second conductive layer is arranged on a side of the second base layer close to the first base layer, and the light source is arranged on a side of the second base layer away from the first base layer; the guest-host dyed liquid crystal layer comprises a cholesterol liquid crystal, a black dye and a chiral agent, the cholesterol liquid crystal has a first zero-field steady state, a second zero-field steady state and an electric field steady state, when the cholesterol liquid crystal is in the first zero-field steady state and the electric field steady state, the outgoing light of the light source diverges outward, and when the cholesterol liquid crystal is in the second zero-field steady state, the outgoing light of the light source and the ambient light are absorbed by the guest-host dyed liquid crystal layer. The liquid crystal handwriting device can be integrated with the installation environment, enhance the user experience, and is not limited by the brightness of the ambient light, thereby improving the display effect.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal handwriting devices, and in particular to a liquid crystal handwriting device. Background Art

[0002] Existing liquid crystal handwriting devices can only display through reflected light, which is largely limited by the brightness of the ambient light and has poor display effects. In addition, the background color of current liquid crystal handwriting devices is black, which will appear very abrupt when placed on a light-colored wall, affecting people's perception of the indoor environment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a liquid crystal handwriting device with good display effect.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a liquid crystal handwriting device, comprising a light source, a first substrate, a second substrate and a guest-host dyed liquid crystal layer arranged between the first substrate and the second substrate, wherein a first conductive layer is provided on a side of the first substrate close to the second substrate, and a second conductive layer is provided on a side of the second substrate close to the first substrate, the light source is arranged on a side of the second substrate away from the first substrate and a light emitting surface of the light source is arranged facing the second substrate; the guest-host dyed liquid crystal layer comprises a cholesterol liquid crystal, a black dye and a chiral agent, the cholesterol liquid crystal has a first zero-field steady state, a second zero-field steady state and an electric field steady state, when the cholesterol liquid crystal is in the first zero-field steady state and the electric field steady state, the outgoing light of the light source passes through the guest-host dyed liquid crystal layer and diverges outward, and when the cholesterol liquid crystal is in the second zero-field steady state after being compressed, the outgoing light of the light source and the ambient light are absorbed by the guest-host dyed liquid crystal layer.

[0005] The beneficial effects of the present invention are: when the cholesterol liquid crystal is in the first zero-field steady state and the electric field steady state, the outgoing light of the light source passes through the guest-host dyed liquid crystal layer and radiates outward, and the liquid crystal handwriting device as a whole presents the color of the light source, and the color of the light source can be set to a color that is adapted to the background color of the installation position of the liquid crystal handwriting device, so that the liquid crystal handwriting device can be well integrated with the installation environment without appearing abrupt, which is beneficial to improving the user's perception of the indoor environment and enhancing the user's experience; and when the cholesterol liquid crystal is compressed and is in the second zero-field steady state, the outgoing light of the light source and the ambient light are absorbed by the guest-host dyed liquid crystal layer, thereby presenting black image and text traces and character traces, which are not limited by the brightness of the ambient light, and effectively improve the display effect of the liquid crystal handwriting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a simplified schematic diagram of the structure of the liquid crystal handwriting device according to the first embodiment of the present invention (when the cholesterol liquid crystal is in the first zero-field steady state);

[0007] Figure 2 This is a simplified schematic diagram of the structure of the liquid crystal handwriting device according to the first embodiment of the present invention (when part of the cholesterol liquid crystal is in the second zero-field steady state after being compressed);

[0008] Figure 3 This is a simplified schematic diagram of the structure of the liquid crystal handwriting device according to the first embodiment of the present invention (when the cholesterol liquid crystal is in a steady state with an electric field applied);

[0009] Figure 4 This is a simplified schematic diagram of the structure of the liquid crystal handwriting device according to the first embodiment of the present invention (when all the cholesterol liquid crystals are in the second zero-field steady state).

[0010] Description of labels:

[0011] 1. Light source;

[0012] 2. The first grassroots level;

[0013] 3. Second base layer;

[0014] 4. Guest-host dyed liquid crystal layer;

[0015] 41. Cholesteric liquid crystal;

[0016] 5. A first conductive layer;

[0017] 6. Second conductive layer. DETAILED DESCRIPTION

[0018] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0019] Please refer to Figures 1 to 4 A liquid crystal handwriting device comprises a light source 1, a first substrate 2, a second substrate 3 and a guest-host dyed liquid crystal layer 4 arranged between the first substrate 2 and the second substrate 3, wherein a first conductive layer 5 is arranged on a side of the first substrate 2 close to the second substrate 3, and a second conductive layer 6 is arranged on a side of the second substrate 3 close to the first substrate 2, the light source 1 is arranged on a side of the second substrate 3 away from the first substrate 2, and a light emitting surface of the light source 1 is arranged opposite to the second substrate 3; the guest-host dyed liquid crystal layer 4 comprises a cholesterol liquid crystal 41, a black dye and a chiral agent, the cholesterol liquid crystal 41 has a first zero-field steady state, a second zero-field steady state and an electric field steady state, when the cholesterol liquid crystal 41 is in the first zero-field steady state and the electric field steady state, the outgoing light of the light source 1 passes through the guest-host dyed liquid crystal layer 4 and diverges outward, and when the cholesterol liquid crystal 41 is in the second zero-field steady state after being compressed, the outgoing light of the light source 1 and the ambient light are absorbed by the guest-host dyed liquid crystal layer 4.

[0020] From the above description, it can be seen that the beneficial effects of the present invention are: when the cholesterol liquid crystal 41 is in the first zero-field steady state and the electric field steady state, the outgoing light of the light source 1 passes through the guest-host dyed liquid crystal layer 4 and radiates outward. At this time, the liquid crystal handwriting device as a whole presents the color of the light source 1, and the color of the light source 1 can be set to a color that is adapted to the background color of the installation position of the liquid crystal handwriting device, so that the liquid crystal handwriting device can be well integrated with the installation environment without being abrupt, which is beneficial to improving the user's perception of the indoor environment and enhancing the user's experience; and when the cholesterol liquid crystal 41 is in the second zero-field steady state after being compressed, the outgoing light of the light source 1 and the ambient light are absorbed by the guest-host dyed liquid crystal layer 4, thereby presenting black image and text traces and character traces. Compared with relying on the reflection of the cholesterol liquid crystal 41 to display the image and text traces and character traces, the technical solution provides the background color through the light source 1 and absorbs the light through the guest-host dyed liquid crystal layer 4, so that the liquid crystal handwriting device is not limited by the brightness of the ambient light, and the display effect of the liquid crystal handwriting device is effectively improved.

[0021] Furthermore, the light emitted by the light source 1 is in a light color.

[0022] Furthermore, the color of the emitted light of the light source 1 is white, tin white, light yellow, light pink, fruit green, pink green, light blue, light purple or light blue.

[0023] From the above description, it can be seen that the light source 1 with light-colored outgoing light can form a sharp contrast with the guest-host dyed liquid crystal layer 4 showing black marks after being compressed, thereby further improving the display effect of the liquid crystal handwriting device.

[0024] Furthermore, the first base layer 2 is a glass or hard film layer; and / or the second base layer 3 is a PET film.

[0025] Furthermore, it also includes a shell, which is provided with a housing cavity for installing the first base layer 2, the guest-host dyed liquid crystal layer 4, the second base layer 3 and the light source 1, and the shell is provided with a power supply and a control component electrically connected to the first conductive layer 5 and the second conductive layer 6 respectively, and the control component is electrically connected to the power supply.

[0026] Further, the control component includes a control switch exposed to the shell, and the control switch includes a first switch for controlling the cholesterol liquid crystal 41 to transform into the electric field steady state and a second switch for controlling the cholesterol liquid crystal 41 to transform into the first zero-field steady state; or, the control switch includes a third switch that first controls the cholesterol liquid crystal 41 to transform into the electric field steady state and then controls the cholesterol liquid crystal 41 to transform into the first zero-field steady state.

[0027] From the above description, it can be seen that when erasing the display traces of the guest-host dyed liquid crystal layer 4, the electric field is first enhanced to transform each cholesterol liquid crystal 41 in the guest-host dyed liquid crystal layer 4 into an electric field applied steady state perpendicular to the first base layer 2 (i.e., Homeotropic state), and then the electric field is slowly weakened to transform each cholesterol liquid crystal 41 in the guest-host dyed liquid crystal layer 4 into the first zero-field steady state (i.e., Focal conic state).

[0028] Furthermore, it also includes an acquisition module and a storage module, wherein the acquisition module is used to acquire character information and graphic information written by the user on the first base layer 2, and store the acquired character information and graphic information in the storage module.

[0029] Furthermore, it also includes a network interface and a sending module, wherein the sending module is used to send the character information and graphic information stored in the storage module to a cloud server or an electronic device connected to the liquid crystal handwriting device through the network interface.

[0030] It can be seen from the above description that the content written by the user on the liquid crystal handwriting device can be saved and transmitted, which is conducive to further enhancing the user's experience.

[0031] Furthermore, the acquisition module includes multiple groups of infrared light transceiver components, and the multiple groups of infrared light transceiver components form an infrared light curtain on the side of the first base layer 2 away from the second base layer 3. The infrared light transceiver components include matching infrared light transmitters and infrared light receivers.

[0032] It can be seen from the above description that the infrared light curtain can accurately record the writing position of the user, thereby determining the graphic information and character information written by the user on the liquid crystal handwriting device.

[0033] Furthermore, the guest-host dyed liquid crystal layer 4 also includes a polymer structure, and the polymer structure is used to bond the first base layer 2 and the second base layer 3 .

[0034] Embodiment 1

[0035] Please refer to Figures 1 to 4 , Embodiment 1 of the present invention is: a liquid crystal handwriting device, which can be used as a handwriting board, a classroom blackboard, a conference room writing board, etc.

[0036] like Figure 1 and Figure 2As shown, the liquid crystal handwriting device includes a light source 1, a first base layer 2, a second base layer 3, and a guest-host dyed liquid crystal layer 4 arranged between the first base layer 2 and the second base layer 3, a first conductive layer 5 is arranged on the side of the first base layer 2 close to the second base layer 3, and a second conductive layer 6 is arranged on the side of the second base layer 3 close to the first base layer 2, the light source 1 is arranged on the side of the second base layer 3 away from the first base layer 2, and the light emitting surface of the light source 1 is arranged directly opposite to the second base layer 3; the guest-host dyed liquid crystal layer 4 includes a cholesterol liquid crystal 41, a black dye and a chiral agent, the cholesterol liquid crystal 41 has a first zero field steady state, a second zero field steady state and an electric field steady state, when the cholesterol liquid crystal 41 is in the first zero field steady state and the electric field steady state, the outgoing light of the light source 1 passes through the guest-host dyed liquid crystal layer 4 and diverges outward, when the cholesterol liquid crystal 41 is in the second zero field steady state after being compressed, the outgoing light of the light source 1 and the ambient light are absorbed by the guest-host dyed liquid crystal layer 4. It is easy to understand that the first base layer 2 is parallel to the second base layer 3. The black dye is prepared by mixing multiple color dyes.

[0037] The first zero field steady state of the cholesterol liquid crystal 41 is the focal conic state (eg Figure 1 As shown in FIG. 1 , at this time, the arrangement of the cholesterol liquid crystal 41 in the guest-host dyed liquid crystal layer 4 is relatively random, and the light emitted by the light source 1 can pass through the guest-host dyed liquid crystal layer 4 and radiate outward. The second zero-field steady state of the cholesterol liquid crystal 41 is the Planar state (as shown in FIG. Figure 4 As shown), at this time, the long axis direction of the cholesterol liquid crystal 41 in the guest-host dyed liquid crystal layer 4 is parallel to the first base layer 2. Due to the guest-host effect, the black dye near the cholesterol liquid crystal 41 in the compressed area will "follow the host" and be arranged in the same direction as the cholesterol liquid crystal 41, thereby absorbing the outgoing light from the light source 1 and the ambient light of the external environment, while the cholesterol liquid crystal 41 in the uncompressed area is still in the first zero-field steady state, and the outgoing light from the light source 1 continues to penetrate the uncompressed area to be emitted, so that the compressed area and the uncompressed area form a sharp contrast, achieving the purpose of displaying graphic information and character information. The electric field steady state of the cholesterol liquid crystal 41 is the Homeotropic state (such as Figure 3 As shown), at this time, the long axis direction of the cholesterol liquid crystal 41 in the guest-host dyed liquid crystal layer 4 is perpendicular to the first base layer 2. At this time, all the emitted light from the light source 1 penetrates the guest-host dyed liquid crystal layer 4.

[0038] From the description in the previous paragraph, it can be seen that the display principle of the liquid crystal handwriting device of this embodiment is essentially different from the display principle of the liquid crystal handwriting device in the prior art. In the prior art, the principle that the liquid crystal handwriting device can display graphic information and character information is that the cholesterol liquid crystal 41 reflects the ambient light of a specific frequency band; while the display principle of the present liquid crystal handwriting device is that the cholesterol liquid crystal 41 is transformed into the second zero-field steady state after being compressed, and the black dye is combined to absorb all the outgoing light from the light source 1 and the ambient light without reflection, thereby forming a black mark, which is in sharp contrast with the outgoing light from the light source 1 corresponding to the uncompressed area, and finally achieves the purpose of displaying graphic information and character information.

[0039] In order to improve the display effect, it is preferred that the outgoing light of the light source 1 presents a light color, and the light colors include but are not limited to white, tin white, goose yellow, light pink, fruit green, pink green, light blue, lavender and light blue. In this embodiment, the liquid crystal handwriting device is arranged on a white wall, so the outgoing light of the light source 1 is white, and the liquid crystal handwriting device can present a "black text on a white background" effect. In other embodiments, when the liquid crystal handwriting device is arranged on a light pink wall, the outgoing light of the light source 1 can be light pink. Similarly, when the liquid crystal handwriting device is arranged on a wall of other light colors, a light source 1 of the corresponding color can be selected.

[0040] Optionally, the light source 1 has lamp beads of various light colors. When the liquid crystal handwriting device is installed on a wall of different light colors, the user can directly control the corresponding light color lamp beads to work. That is to say, at this time, the same liquid crystal handwriting device can be adapted to walls of various different light colors, greatly improving the versatility of the liquid crystal handwriting device. It is easy to understand that for cost considerations, it is also feasible for the light source 1 to be a monochromatic light source 1 (i.e., lamp beads of only one color).

[0041] The liquid crystal handwriting device also includes a shell, which is provided with a housing cavity for installing the first base layer 2, the guest-host dyed liquid crystal layer 4, the second base layer 3 and the light source 1, and the shell is provided with a power supply and a control component electrically connected to the first conductive layer 5 and the second conductive layer 6 respectively, and the control component is electrically connected to the power supply.

[0042] The user can control the on and off of the light source 1 through the control component. In detail, the control component includes a control switch exposed to the housing, and the control switch includes a light switch for controlling the on and off of the light source 1.

[0043] The user can also control the erasure of writing marks on the liquid crystal handwriting device through the control component. Those skilled in the art should know that the relationship between the state of liquid crystal molecules and the electric field strength is as follows: after adding an electric field to the liquid crystal molecules in the Planar state, the liquid crystal molecules will transform into the Focal conic state or the Homeotropic state; after adding an electric field to the liquid crystal molecules in the Focal conic state, the liquid crystal molecules will transform into the Homeotropic state; after slowly reducing the electric field to the liquid crystal molecules in the Homeotropic state, the liquid crystal molecules will transform into the Focal conic state; after quickly reducing the electric field to the liquid crystal molecules in the Homeotropic state, the liquid crystal molecules will transform into the transient Planar state and then into the Planar state; after strengthening the electric field to the liquid crystal molecules in the transient Planar state, the liquid crystal molecules will transform into the Focal conic state or the Homeotropic state. It can be seen that when erasing writing marks on the liquid crystal handwriting device, it is necessary to first increase the electric field between the first conductive layer 5 and the second conductive layer 6 so that all the cholesterol liquid crystals 41 in the guest-host dyed liquid crystal layer 4 are transformed into the Homeotropic state, and then slowly reduce the electric field so that all the cholesterol liquid crystals 41 in the guest-host dyed liquid crystal layer 4 are transformed into the Focal conic state.

[0044] Therefore, optionally, the control switch also includes a first switch for controlling the cholesterol liquid crystal 41 to be transformed into the electric field steady state and a second switch for controlling the cholesterol liquid crystal 41 to be transformed into the first zero field steady state. However, when erasing writing marks, the user needs to operate the first switch first and then the second switch. The whole operation process may be a little troublesome. In order to facilitate the user to perform the erasing operation, only a third switch for controlling the voltage difference between the first conductive layer 5 and the second conductive layer 6 can be set. When the user operates the third switch, the third switch first controls the cholesterol liquid crystal 41 to be transformed into the electric field steady state and then controls the cholesterol liquid crystal 41 to be transformed into the first zero field steady state. In this way, the user only needs to operate the third switch once to erase the writing marks, and the operation is simpler. It should be noted that the technology of controlling the circuit to first increase the voltage and then reduce the voltage by a switch is a commonly used technical means in the field of electronic circuit technology, which will not be repeated here.

[0045] Optionally, the first base layer 2 is glass or a hard film layer, and the hard film layer includes but is not limited to a PET film or other polymer films; the first conductive layer 5 is a conductive film or an etched circuit etched on the first base layer 2. The second base layer 3 is glass or a hard film layer, and the hard film layer can be a transparent plastic film, a transparent plastic plate, a PET film, etc.

[0046] Optionally, the liquid crystal handwriting device also includes an acquisition module and a storage module. The acquisition module is used to acquire character information and graphic information (i.e., writing traces) written by the user on the first base layer 2, and store the acquired character information and graphic information in the storage module. The storage module can be a storage chip for storing the character information and graphic information acquired by the acquisition module.

[0047] In this embodiment, the acquisition module can be an image acquisition module. After the user finishes writing, the character information and graphic information input by the user can be analyzed by acquiring the current writing screen information; the character information and graphic information written by the user on the first base layer 2 can be acquired by setting the acquisition module, and a storage chip is used to store the acquired data, so as to effectively record the user's writing content and prevent the loss of important data after the writing notes are erased, especially the storage of meeting content. Specifically, the above-mentioned liquid crystal handwriting device can also be an electronic device with a touch screen.

[0048] It should be noted that there are many specific types of acquisition modules, which are not limited to image acquisition modules. For example, in other embodiments, the acquisition module includes multiple groups of infrared light transceiver components, and the multiple groups of infrared light transceiver components form an infrared light curtain on the side of the first base layer 2 away from the second base layer 3. The infrared light transceiver components include matching infrared light transmitters and infrared light receivers.

[0049] Furthermore, the liquid crystal handwriting device also includes a network interface and a sending module, and the sending module is used to send the character information and graphic information stored in the storage module to a cloud server or an electronic device connected to the liquid crystal handwriting device through the network interface. The sending module can be a driving circuit and a data processing chip for packaging data to match the transmission protocol. Specifically, the sending module can read the character information and graphic information stored in the storage chip at regular intervals or by receiving instructions input by the user, and package the read character information and graphic information to form a data packet matching the transmission protocol, and finally send the data packet to the server or the electronic device connected to the liquid crystal handwriting device through the network interface.

[0050] The guest-host dyed liquid crystal layer 4 further comprises a polymer structure, and the polymer structure is used to bond the first base layer 2 and the second base layer 3. The polymer structure is preferably a polymer material that is less than 50% UV-curable or heat-curable.

[0051] In summary, in the liquid crystal handwriting device provided by the present invention, when the cholesterol liquid crystal is in the first zero-field steady state and the electric field steady state, the outgoing light of the light source passes through the guest-host dyed liquid crystal layer and radiates outward, and at this time the liquid crystal handwriting device as a whole presents the color of the light source, and the color of the light source can be set to a color that is adapted to the background color of the installation position of the liquid crystal handwriting device, so that the liquid crystal handwriting device can be well integrated with the installation environment without appearing abrupt, which is beneficial to improving the user's perception of the indoor environment and enhancing the user's experience; and when the cholesterol liquid crystal is compressed and is in the second zero-field steady state, the outgoing light of the light source and the ambient light are absorbed by the guest-host dyed liquid crystal layer, thereby presenting black image and text traces and character traces, which are not limited by the brightness of the ambient light, and effectively improve the display effect of the liquid crystal handwriting device.

[0052] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A liquid crystal handwriting device, characterized in that: The invention comprises a light source, a first substrate, a second substrate and a guest-host dyed liquid crystal layer arranged between the first substrate and the second substrate, wherein a first conductive layer is arranged on a side of the first substrate close to the second substrate, and a second conductive layer is arranged on a side of the second substrate close to the first substrate, the light source is arranged on a side of the second substrate away from the first substrate, and a light emitting surface of the light source is arranged facing the second substrate; the guest-host dyed liquid crystal layer comprises a cholesterol liquid crystal, a black dye and a chiral agent, the cholesterol liquid crystal has a first zero-field steady state, a second zero-field steady state and an electric field applied steady state, and when the cholesterol liquid crystal is in the first zero-field steady state and the second zero-field steady state, the cholesterol liquid crystal is in the second zero-field steady state and the electric field applied steady state, and when the cholesterol liquid crystal is in the first zero-field steady state and the second zero-field steady state, the cholesterol liquid crystal is in the second zero-field steady state and the electric field applied steady state, and when the cholesterol liquid crystal is in the first zero-field steady state and the electric field applied ... the cholesterol liquid crystal is in the second zero-field steady state and the electric field applied steady state, and when the cholesterol liquid crystal is in the first zero-field steady state and the electric field When the electric field is applied in a steady state, the outgoing light of the light source passes through the guest-host dyed liquid crystal layer and radiates outward. When the cholesterol liquid crystal is in a second zero-field steady state after being compressed, the outgoing light of the light source and the ambient light are absorbed by the guest-host dyed liquid crystal layer. The device also includes an acquisition module and a storage module. The acquisition module is used to acquire the character information and graphic information written by the user on the first substrate, and store the acquired character information and graphic information in the storage module. The acquisition module includes multiple groups of infrared light transceiver components, and the multiple groups of infrared light transceiver components form an infrared light curtain on the side of the first substrate away from the second substrate. The infrared light transceiver assembly includes a matching infrared light transmitter and an infrared light receiver; it also includes a network interface and a sending module, the sending module is used to send the character information and graphic information stored in the storage module to a cloud server or an electronic device connected to the liquid crystal handwriting device through the network interface; the light emitted by the light source presents a light color; the color of the light emitted by the light source is white, tin white, goose yellow, light pink, fruit green, pink green, light blue, light purple or light blue; it also includes a shell, the shell is provided with a shell for installing the first base layer, the guest-host dyed liquid crystal layer, the second base layer and the light The shell is provided with a power supply and a control component electrically connected to the first conductive layer and the second conductive layer respectively, and the control component is electrically connected to the power supply; the control component includes a control switch exposed from the shell, and the control switch includes a first switch for controlling the cholesterol liquid crystal to be transformed into the electric field steady state and a second switch for controlling the cholesterol liquid crystal to be transformed into the first zero field steady state; or, the control switch includes a third switch for first controlling the cholesterol liquid crystal to be transformed into the electric field steady state and then controlling the cholesterol liquid crystal to be transformed into the first zero field steady state.

2. The liquid crystal handwriting device according to claim 1, characterized in that: The first base layer is glass or a hard film layer; and / or the second base layer is a PET film.

3. The liquid crystal handwriting device according to claim 1, characterized in that: The guest-host dyed liquid crystal layer further comprises a polymer structure, and the polymer structure is used for bonding the first base layer and the second base layer.

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