CN112684646A - Writable display device, writing device, and electronic device - Google Patents
Writable display device, writing device, and electronic device Download PDFInfo
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- CN112684646A CN112684646A CN202110055707.2A CN202110055707A CN112684646A CN 112684646 A CN112684646 A CN 112684646A CN 202110055707 A CN202110055707 A CN 202110055707A CN 112684646 A CN112684646 A CN 112684646A
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Abstract
The application provides an electronic device, including: a writable display device, comprising a first substrate; a second substrate; the liquid crystal layer is formed between the first substrate and the second substrate and is cholesteric liquid crystal; the pitch of the cholesteric liquid crystal changes with temperature, and the wavelength of the reflected light changes with temperature. The electronic device provided by the invention can display the writing traces with different colors on the writable display device, thereby further enriching the writing experience.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a writable display device, a writing device, and an electronic device.
Background
The unique spiral structure of the cholesteric liquid crystal material endows the cholesteric liquid crystal material with special optical characteristics, and different texture forms correspond to different optical properties. The cholesteric system in a planar texture state has selective reflection characteristics, and meanwhile, the pyramid texture of the cholesteric system has an unfixed direction corresponding to the spin direction and the spiral axis in the liquid crystal system, and the unfixed direction is disordered and arranged to enable the liquid crystal system to show a strong light scattering state. The transition of the two states can be controlled by external pressure, an electric field, a magnetic field and the like, and further a display function is realized. The display device designed by utilizing the characteristics of the cholesteric liquid crystal system has the advantages of low power consumption, high reflection and wide viewing angle, can realize the reading effect similar to paper, and is particularly suitable for the fields of electronic book readers, commercial advertisements and the like.
Cholesteric liquid crystal systems are the first discovered type of liquid crystal that contain chiral carbon atoms in the liquid crystal molecular structure or are formed by incorporating chiral compounds into a nematic liquid crystal. The latter application is more practical for real-time display, and the handwriting writable display device uses a cholesteric liquid crystal system formed of a nematic liquid crystal system to which a chiral agent is added. The liquid crystal system in the traditional cholesteric handwriting display device is mainly characterized in that a reactive polymer is added into a cholesteric liquid crystal system, and then the helical pitch of a helical structure of cholesteric liquid crystal in the liquid crystal system is in non-uniform distribution through photopolymerization and is fixed to realize the simultaneous reflection of various wave bands, so that the presented light is grey white mostly. The handwriting display device has single color and is not rich enough in writing experience.
Disclosure of Invention
The application provides a writable display device capable of displaying different colors according to the temperature setting of a writing device.
The present application further provides a writing instrument that cooperates with the writable display device.
The present application also provides an electronic device including the writable display device and the writing device.
In order to solve the above problems, the technical solution provided by the present application is as follows:
the application provides a writable display device, including:
a first substrate;
a second substrate; and
the liquid crystal layer is formed between the first substrate and the second substrate and is cholesteric liquid crystal; the pitch of the cholesteric liquid crystal changes with temperature, and the wavelength of the reflected light changes with temperature.
In an alternative embodiment of the application, the pitch of the cholesteric liquid crystal increases with increasing temperature, and the wavelength of the light reflected by the cholesteric liquid crystal increases with increasing temperature.
In an alternative embodiment of the present application, the cholesteric liquid crystal includes a nematic liquid crystal and a temperature-sensitive chiral compound doped in the nematic liquid crystal.
In an alternative embodiment of the present application, the molecular structural formula of the temperature-sensitive chiral compound is:
in an alternative embodiment of the present application, the wavelength range of the light reflected by the cholesteric liquid crystal is: 380 nm-780 nm.
A second aspect of the present application provides a writing device for leaving a writing trace on a writable display device; the writing device comprises a holding part, a writing part and a control part, the writing part is in contact with the writable display device during writing, the holding part is connected with the writing part, and the control part is used for controlling the temperature of the writing part.
In an alternative embodiment of the present application, the writing instrument includes a heating portion for heating the writing portion, and the heating portion is heated by an electrothermal type or an electromagnetic type.
In an optional embodiment of the present application, the writing apparatus further includes a temperature sensor for detecting a temperature of the writing part, and the control part controls whether the heating part operates or not according to the temperature sensor.
A third aspect of the present application provides an electronic apparatus comprising:
a writable display device as described above; and
a writing instrument as described above;
wherein, the part of the writable display device contacted with the writing part of the writing device can display writing traces with different colors along with the different temperatures of the writing part.
In an optional embodiment of the present application, the electronic device further includes a temperature colorimetric card, and the user sets the temperature of the writing portion of the writing device according to the temperature colorimetric card.
The beneficial effect of this application does: the writable display device, the writing device and the electronic device provided by the application are characterized in that a temperature-sensitive chiral compound is doped into nematic liquid crystal to form cholesteric liquid crystal. 1) The pitch of the temperature-sensitive chiral compound can be changed along with the change of the writing temperature, so that a liquid crystal system of the cholesteric liquid crystal layer can be converted between a plane texture and a pyramid texture, the conversion between the reflection state and the scattering state of light is realized, and the purpose of displaying is achieved. 2) The characteristic that temperature-sensitive chiral compounds can reflect light with different wavelengths is utilized, the temperature-controllable writing device is matched, when the writing device writes on the writable display device at different set temperatures, the screw pitch of the cholesteric liquid crystal changes along with the change of the temperature of the writing device and reflects the light with different wavelengths, so that writing traces with different colors are displayed on the writable display device, and the writing experience is further enriched.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an electronic device according to a preferred embodiment of the invention.
Fig. 2 is a schematic diagram of cholesteric liquid crystals of a liquid crystal layer of the writable display device in the electronic device shown in fig. 1 corresponding to different pitches at different temperatures.
Fig. 3 is a schematic view of cholesteric liquid crystal in a pyramidically structured state (scattering state) of the writable display device of fig. 1;
FIG. 4 is a schematic representation of cholesteric liquid crystal in a planar texture state (reflective state) of the writable display device of FIG. 1; and
fig. 5 is a schematic block diagram of the writing instrument of fig. 1.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "width," "upper," "lower," and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The present application may repeat reference numerals and/or letters in the various implementations, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various implementations and/or configurations discussed.
This application shows that the look grass is single to current display device can write, write and experience technical problem such as not abundant, dope temperature sensitive chiral compound in nematic liquid crystal, in order to constitute cholesteric liquid crystal layer, the pitch that utilizes temperature sensitive chiral compound can change and the characteristic that temperature sensitive chiral compound can reflect the light of different wavelength along with the change of writing the temperature, and the controllable writing device of a collocation temperature, make display device can write the writing trace that can show different colours when writing with different settlement temperatures, further richen write and experience.
The writable display device, the writing device, and the electronic device provided by the present application will be described in detail below with reference to specific embodiments.
Referring to fig. 1 to 5, an electronic device 100 is provided. The electronic device 100 includes a writable display device 10 and a writing device 20. The writable display device 10 may display written traces of different colors. The writing device 20 is used to leave a written trace on the writable display device 10.
In an alternative embodiment of the present application, one of the writing instruments 20 corresponds to one of the writable display instruments 10. That is, the electronic device 100 includes one of the writable display device 10 and one of the writing devices 20.
In another alternative embodiment of the present application, one of the writing devices 20 corresponds to a plurality of the writable display devices 10. That is, the electronic device 100 includes a plurality of the writable display devices 10 and one of the writing devices 20.
The writable display device 10 may be a display screen, a computer, a mobile phone, or the like. In an alternative embodiment of the present application, the writable display device 10 is a display screen.
Specifically, referring to fig. 1, the writable display device 10 includes a first substrate 11, a second substrate 12, and a liquid crystal layer 13 formed between the first substrate 11 and the second substrate 12.
The first substrate 11 is a transparent flexible substrate, and the flexible substrate enables the first substrate 11 to deform under the action of an external force (a force generated when the writing device 20 touches and presses the writable display device 10), so as to change the distance between the first writable display device 11 and the second writable display device 12, and thus, the cholesteric liquid crystal layer is changed from a pyramid texture to a planar texture.
Preferably, the first substrate 11 is an Indium Tin Oxide (ITO) substrate.
In an alternative embodiment of the present application, the second substrate 12 is a transparent flexible substrate or a transparent rigid substrate.
In an alternative embodiment of the present application, the second substrate 12 is an opaque flexible substrate or an opaque rigid substrate.
Preferably, the second substrate 12 is an Indium Tin Oxide (ITO) substrate.
In an alternative embodiment of the present application, the second substrate 12 is an array substrate. Specifically, the second substrate 12 includes a second substrate, an array layer disposed on the second substrate, a light emitting device layer disposed on the array layer, and an encapsulation layer covering the light emitting device layer.
Wherein the liquid crystal layer 13 is cholesteric liquid crystal. The cholesteric liquid crystal has temperature-sensitive characteristic, the pitch of the cholesteric liquid crystal changes along with temperature change, and the wavelength of reflected light changes along with temperature change.
In an alternative embodiment of the application, the higher the temperature, the longer the pitch P of the cholesteric liquid crystal. That is, the pitch P of the cholesteric liquid crystal increases with increasing temperature.
Specifically, referring to fig. 2, the distances between the first substrate 11 and the second substrate 12 are defined as P1, P2, P3 and P4 in sequence, and as shown in fig. 1, P1< P2< P3< P4. Specifically, P1, P2, P3, and P4 are pitches of the cholesteric liquid crystal layer 13. Defining the temperatures corresponding to P1, P2, P3 and P4 to be T1, T2, T3 and T4, respectively, then T1< T2< T3< T4.
In an alternative embodiment of the application, the wavelength of the light reflected by the cholesteric liquid crystal increases with increasing temperature.
In an alternative embodiment of the present application, the wavelength range of the light reflected by the cholesteric liquid crystal is: 380 nm-780 nm.
The cholesteric liquid crystal has memory characteristics, and can keep display contents for a long time under a zero electric field, so that the display power consumption can be greatly reduced. The cholesteric liquid crystal has a unique spiral structure, the spiral structure endows the cholesteric liquid crystal with special optical characteristics, and different texture forms correspond to different optical properties. Specifically, the pyramid texture corresponds to a dark state, the planar texture corresponds to a bright state, and the contrast between light and dark can be used to display a writing trace on the writable display device 10.
Cholesteric systems in planar texture states have selective reflection properties, which follow the Bragg formula for crystal diffraction:
λ ═ 2nPsin Φ, where λ — the wavelength of reflected light; p is the pitch of the cholesteric liquid crystal; n-average refractive index;
it can be seen that the reflection characteristic of the cholesteric system in the planar texture state is related to the pitch of the helical structure of the cholesteric system in the planar texture state, in particular the pitch of the cholesteric system in the planar texture state is directly proportional to the wavelength of the reflected light reflected by the cholesteric system in the planar texture state. The wavelength of the reflected light can be controlled by utilizing the characteristic so as to endow the display device with different color expressions. Meanwhile, the pyramid texture of the cholesteric system has an unstable orientation corresponding to the spin direction and the spiral axis in the liquid crystal system, and the liquid crystal system shows a strong light scattering state due to certain disordered arrangement of the pyramid texture. The transition of the two states can be controlled by external pressure, an electric field, a magnetic field and the like, and further a display function is realized. The device designed by utilizing the characteristics of the cholesteric liquid crystal system has the advantages of low power consumption, high reflection and wide viewing angle, can realize the reading effect similar to paper, and is particularly suitable for the fields of electronic book readers, commercial advertisements and the like.
Specifically, the cholesteric liquid crystal includes a nematic liquid crystal 131 and a temperature-sensitive chiral compound 132 doped in the nematic liquid crystal 131. The helical twisting force constant of the temperature-sensitive chiral compound 132 changes along with the change of temperature, the temperature-sensitive chiral compound 132 doped in the nematic liquid crystal 131 influences the pitch P of the cholesteric liquid crystal, and the pitch P of the cholesteric liquid crystal layer and the helical twisting force constant HTP of the temperature-sensitive chiral compound 132 doped in the nematic liquid crystal 131 satisfy the following formula:
P(μm)＝[(HTP)·Xc]-1；
wherein Xc is the molar concentration of the temperature-sensitive chiral compound doped in the cholesteric liquid crystal layer.
In an alternative embodiment of the present application, the molecular structural formula of the temperature-sensitive chiral compound 132 is:
specifically, in an alternative embodiment of the present application, the wavelength of the light reflected by the temperature-sensitive chiral compound 132 in the cholesteric liquid crystal increases with increasing temperature.
In an alternative embodiment of the present application, the wavelength range of the light reflected by the temperature-sensitive chiral compound 132 in the cholesteric liquid crystal is: 380 nm-780 nm.
Wherein the writable display device 10 further comprises an absorbent coating 14. The absorbing coating 14 is formed on the surface of the second substrate 12 remote from the liquid crystal layer 13.
Referring to fig. 3, when the cholesteric liquid crystal is in a pyramid texture and in a scattering state, the absorption coating 14 absorbs scattered light incident on the liquid crystal layer 13, and the pyramid texture is in a dark state.
Referring to fig. 1 and 4, when the writing device 20 writes on the writable display device 10, the distance between the first substrate 11 and the second substrate 12 is decreased, which causes the cholesteric liquid crystal to move, and further forms a certain alignment, the cholesteric liquid crystal changes from a pyramid texture to a planar texture, that is, the cholesteric liquid crystal changes from a scattering state to a reflecting state, and the temperature-sensitive chiral compound 132 of the cholesteric liquid crystal in the planar texture state reflects light to make it in a bright state. The plane texture in a bright state and the surrounding pyramid texture form bright-dark contrast, and the display function is realized.
When the writing device 20 is separated from the writable display device 10, a pressure is applied between the first substrate 11 and the second substrate 12 to form an electric field between the first substrate 11 and the second substrate 12, the electric field moves the cholesteric liquid crystal and aligns the cholesteric liquid crystal according to a certain orientation, the cholesteric liquid crystal gradually changes from an angular plane texture to a pyramidal texture, in the process, the light and shade contrast on the writable display device 10 gradually disappears until the colored writing marks are no longer displayed, at this time, the cholesteric liquid crystal completely changes from a reflective state to a scattering state, and the absorption coating 14 absorbs the scattered light incident on the cholesteric liquid crystal layer 13.
In an alternative embodiment of the present application, the voltage applied between the first substrate 11 and the second substrate 12 is 20V to 40V, the frequency of the applied voltage is 10Hz, the voltage application time is 1 to 10s, and the waveform of the applied voltage is a square wave.
Wherein the writing device 20 is a temperature-controllable writing device.
Specifically, referring to fig. 5, the writing device 20 includes a writing portion 21, a holding portion 22 and a control portion 23. The writing part 21 is used for contacting with the writable display device 10 during writing, and the temperature of the writing part 21 can be set according to actual conditions. The holding portion 22 is connected to the writing portion 21 and is used for a user to hold for writing. The control section 23 is configured to control the temperature of the writing section 21.
In an alternative embodiment of the present application, a temperature setting panel (not shown) is further set on the writing device 20, the user can set the temperature on the temperature setting panel according to actual conditions, and the control unit 23 controls the temperature of the writing unit 21 according to the set temperature.
In an alternative embodiment of the present application, the writing device 20 further includes a heating portion 24, and the heating portion 24 is used for heating the writing portion 21. The heating part is heated in an electric heating mode or an electromagnetic heating mode.
In an alternative embodiment of the present application, the writing device 20 further includes a temperature sensor (not shown) for detecting a temperature of the writing part 21, and the control part 23 controls whether the heating part 24 operates or not according to the temperature sensor.
In an optional embodiment of the present application, the set temperatures may be set according to different colors corresponding to different wavelengths of light reflected by the cholesteric liquid crystal, and each of the set temperatures corresponds to one color.
The electronic device 100 may further include a temperature colorimetric card (not shown), which may be disposed on the writing device 20 or disposed separately from the writable display device 10 and the writing device 20. The user can quickly set the temperature of the writing part 21 according to the color desired to be displayed.
When the writing device 20 writes on the writable display device 10 at different set temperatures, the pitch of the cholesteric liquid crystal changes with the change of the temperature of the writing device 20 and reflects light of different wavelengths, and the writable display device 10 displays writing traces of different colors.
The beneficial effect of this application does: the writable display device, the writing device and the electronic device provided by the application are characterized in that a temperature-sensitive chiral compound is doped into nematic liquid crystal to form cholesteric liquid crystal. 1) The pitch of the temperature-sensitive chiral compound can be changed along with the change of the writing temperature, so that a liquid crystal system of the cholesteric liquid crystal layer can be converted between a plane texture and a pyramid texture, the conversion between the reflection state and the scattering state of light is realized, and the purpose of displaying is achieved. 2) The characteristic that temperature-sensitive chiral compounds can reflect light with different wavelengths is utilized, the temperature-controllable writing device is matched, when the writing device writes on the writable display device at different set temperatures, the screw pitch of the cholesteric liquid crystal changes along with the change of the temperature of the writing device and reflects the light with different wavelengths, so that writing traces with different colors are displayed on the writable display device, and the writing experience is further enriched.
In summary, although the present application has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application shall be determined by the appended claims.
Claims (10)
1. A writable display device, comprising:
a first substrate;
a second substrate; and
the liquid crystal layer is formed between the first substrate and the second substrate, the liquid crystal layer is cholesteric liquid crystal, the pitch of the cholesteric liquid crystal changes along with the change of temperature, and the wavelength of light reflected by the cholesteric liquid crystal changes along with the change of temperature.
2. A writable display device according to claim 1, characterized in that the pitch of the cholesteric liquid crystal increases with increasing temperature and the wavelength of the light reflected by the cholesteric liquid crystal increases with increasing temperature.
3. The writable display device of claim 1, wherein the cholesteric liquid crystal comprises a nematic liquid crystal and a temperature-sensitive chiral compound doped in the nematic liquid crystal.
4. A writable display device according to claim 3, characterized in that the molecular structural formula of the temperature-sensitive chiral compound is:
5. a writable display device according to claim 1, characterized in that the wavelength range of the light reflected by the cholesteric liquid crystal layer is: 380 nm-780 nm.
6. A writing device for leaving a writing trace on a writable display device; the writing device is characterized by comprising a holding part, a writing part and a control part, wherein the writing part is in contact with the writable display device during writing, the holding part is connected with the writing part, and the control part is used for controlling the temperature of the writing part.
7. The writing instrument as recited in claim 6, further comprising a heating portion for heating said writing portion, said heating portion being heated by an electrothermal or electromagnetic heating.
8. The writing instrument as claimed in claim 7, further comprising a temperature sensor for detecting a temperature of the writing part, wherein the control part controls whether the heating part operates according to the temperature sensor.
9. An electronic device, comprising:
the writable display device of any one of claims 1-5; and
the writing instrument of any one of claims 6-8;
the part of the writable display device, which is in contact with the writing part of the writing device, can display writing traces with different colors according to the temperature of the writing part.
10. The electronic device according to claim 9, further comprising a temperature color chart, wherein the user sets the temperature of the writing part according to the temperature color chart.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110055707.2A CN112684646A (en) | 2021-01-15 | 2021-01-15 | Writable display device, writing device, and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110055707.2A CN112684646A (en) | 2021-01-15 | 2021-01-15 | Writable display device, writing device, and electronic device |
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| CN112684646A true CN112684646A (en) | 2021-04-20 |
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| CN113759623A (en) * | 2021-09-07 | 2021-12-07 | 京东方科技集团股份有限公司 | Liquid crystal writing board, display method thereof and writing device |
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