CN110764325A - Structure for improving brightness of cholesteric liquid crystal handwriting board - Google Patents
Structure for improving brightness of cholesteric liquid crystal handwriting board Download PDFInfo
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- CN110764325A CN110764325A CN201911151202.5A CN201911151202A CN110764325A CN 110764325 A CN110764325 A CN 110764325A CN 201911151202 A CN201911151202 A CN 201911151202A CN 110764325 A CN110764325 A CN 110764325A
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- liquid crystal
- crystal layer
- lower liquid
- upper liquid
- film substrate
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
Abstract
The invention discloses a structure for improving the brightness of a cholesteric liquid crystal handwriting board, which is characterized in that an upper liquid crystal layer and a lower liquid crystal layer with two different attributes are arranged between an upper liquid crystal surface film substrate and a lower liquid crystal surface film substrate, and a middle liquid crystal surface film substrate is arranged between the two liquid crystal layers; setting the chirality of an upper liquid crystal layer and the chirality of a lower liquid crystal layer to be opposite, setting the thread pitches to be different, respectively setting transparent ITO electrode layers on the upper liquid crystal layer and the lower liquid crystal layer, and connecting the transparent ITO electrode layers to the same power supply in parallel; the power supply branches of the upper liquid crystal layer and the lower liquid crystal layer are respectively provided with a first circuit control switch and a second circuit control switch, and the common branch of the upper liquid crystal layer and the lower liquid crystal layer is provided with a third circuit control switch. The invention realizes the effect of reflecting double light intensity by arranging two liquid crystal layers with opposite chirality and reflecting light with two chiralities simultaneously, thereby greatly improving the handwriting brightness.
Description
Technical Field
The invention relates to the technical field of display, in particular to a structural design capable of improving the brightness of a cholesteric liquid crystal handwriting board.
Background
In the traditional technology, people generally record some instant information through instruments such as a blackboard and a whiteboard, the instruments need to be matched with instruments such as a chalk and an ink pen to finish writing when in use, corresponding handwriting can be erased by means of the blackboard eraser instrument when the handwriting is written on a board body and needs to be erased, and the instruments can achieve the effect of repeated writing but are very inconvenient to use.
Therefore, a liquid crystal handwriting board capable of being erased by one key is produced, but with the continuous development of scientific technology and the continuous improvement of living standard of people, people have more and more extensive use of liquid crystal display equipment, and the brightness requirement and the color requirement of the liquid crystal display equipment are also higher and higher. In the prior art, the liquid crystal handwriting board has been widely used because of its characteristics of light weight, portability, and convenient writing and erasing. However, the existing liquid crystal handwriting board has single color development control and insufficient note brightness, cannot fully meet the functional requirements of people on the liquid crystal handwriting board, and has great application limitation.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a structure for improving the brightness of a cholesteric liquid crystal handwriting board, so that the double-light-intensity effect is realized by arranging two liquid crystal layers and reflecting two kinds of chiral light at the same time, and the handwriting brightness is greatly improved.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention relates to a structure for improving the brightness of a cholesteric liquid crystal handwriting board, which is characterized in that an upper liquid crystal layer and a lower liquid crystal layer with different chirality are arranged between an upper liquid crystal surface film substrate and a lower liquid crystal surface film substrate, and a middle liquid crystal surface film substrate is arranged between the upper liquid crystal layer and the lower liquid crystal layer;
setting the chirality of the upper liquid crystal layer and the chirality of the lower liquid crystal layer to be opposite, so that the upper liquid crystal layer and the lower liquid crystal layer can reflect left-handed light and right-handed light simultaneously;
setting different screw pitches of the upper liquid crystal layer and the lower liquid crystal layer to enable the reflection colors of the upper liquid crystal layer and the lower liquid crystal layer to be different, and forming a mixed color of the handwriting board by the different reflection colors;
transparent ITO electrodes are respectively arranged on the upper liquid crystal layer and the lower liquid crystal layer and are connected to the same power supply in parallel; a first control switch is arranged on the power supply branch of the upper liquid crystal layer, a second circuit control switch is arranged on the power supply branch of the lower liquid crystal layer, and a third circuit control switch is arranged on the common branch of the upper liquid crystal layer and the lower liquid crystal layer;
when the first circuit control switch controls the power supply branch of the upper liquid crystal layer to be conducted, the color on the upper liquid crystal layer is erased, and the handwriting board only displays the color of the lower liquid crystal layer;
when the second circuit control switch controls the power supply branch of the lower liquid crystal layer to be conducted, the color on the lower liquid crystal layer is erased, and the handwriting board only displays the color of the upper liquid crystal layer;
and when the third circuit controls the switch to control the conduction of the common power supply branch of the upper liquid crystal layer and the lower liquid crystal layer, the colors on the upper liquid crystal layer and the lower liquid crystal layer are erased.
The structure for improving the brightness of the cholesteric liquid crystal handwriting board is also characterized in that:
the upper liquid crystal surface film substrate and the middle liquid crystal surface film substrate are made of flexible transparent base materials, and the lower liquid crystal surface film substrate is made of black base materials.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adds the chiral agents with different chiralities to ensure that the chirality of the two liquid crystal layers is opposite, when light irradiates, the upper liquid crystal layer can reflect light with one chirality, the light with the other chirality can transmit the light, when the light reaches the lower liquid crystal layer, the light with the other chirality can be reflected, thereby realizing the purpose of simultaneously reflecting the light with the two chiralities, and the two lights are superposed together to greatly improve the brightness of the handwriting.
2. In order to realize independent electrification of the liquid crystal layer, the invention designs a three-layer liquid crystal film substrate structure, and each layer of liquid crystal can be provided with an independent transparent ITO electrode layer, thereby realizing the effect of changing the color by completely erasing by one key or independently erasing a certain layer.
3. The color of the current liquid crystal handwriting board is fixed, and the color of handwriting cannot be changed. The invention can make the two layers of liquid crystal have different screw pitches by adjusting the concentration of the chiral agent to display the composite mixed color of two different colors, and then the designed power control circuit can independently electrify one layer of liquid crystal layer and restore the cholesteric liquid crystal from the P state to the transparent normal state, thereby only displaying the handwriting color of the other layer of liquid crystal layer, realizing the change of the handwriting color and achieving the purpose of adjusting the handwriting color.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a liquid crystal handwriting pad for improving brightness according to the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of a brightness enhancing liquid crystal writing pad according to the present invention;
FIG. 3 is a circuit diagram of a liquid crystal handwriting pad for improving brightness according to the present invention;
FIG. 4 is a schematic diagram of the light reflection of the liquid crystal handwriting board for improving brightness according to the invention:
reference numbers in the figures: 1, a shell; an upper conductive ITO layer on the liquid crystal layer 51; 52 a lower conductive ITO layer on the upper liquid crystal layer; 53 an upper conductive ITO layer on the lower liquid crystal layer; 54 lower liquid crystal layer lower conductive ITO layer; 21 a first control switch; 22 a second control switch; 23 a third control switch; 61, a liquid crystal layer is arranged; 62 lower liquid crystal layer; 3, a groove; 7, a power supply; 41 an upper liquid crystal surface film substrate; 42 liquid crystal surface film substrate; 43 lower liquid crystal surface film substrate.
Detailed Description
In the embodiment, as shown in fig. 2, a structure for improving the brightness of a cholesteric liquid crystal handwriting pad is that an upper liquid crystal layer 61 and a lower liquid crystal layer 62 with two different attributes are arranged between an upper liquid crystal surface film substrate 41 and a lower liquid crystal surface film substrate 43, and a middle liquid crystal surface film substrate 42 is arranged between the upper liquid crystal layer 61 and the lower liquid crystal layer 62;
the liquid crystal surface film substrate in this example is made of transparent PET material, which has good transparency and flexibility and good friction resistance, and the middle liquid crystal surface film substrate 42 is thinner than the upper and lower substrates. Spin-coating a transparent ITO electrode layer between the liquid crystal and the substrate, wherein the electrodes of the upper liquid crystal layer 61 are an upper conductive ITO layer 51 and a lower conductive ITO layer 52; the electrodes of the lower liquid crystal layer 62 are an upper conductive ITO layer 53 and a lower conductive ITO layer 54;
the chirality of the upper liquid crystal layer 61 and the chirality of the lower liquid crystal layer 62 are opposite, so that the upper liquid crystal layer 61 and the lower liquid crystal layer 62 can reflect left-handed light and right-handed light at the same time, and the effect of greatly improving the handwriting brightness is achieved;
setting the thread pitches of the upper liquid crystal layer 61 and the lower liquid crystal layer 62 to be different, so that the reflection colors of the upper liquid crystal layer 61 and the lower liquid crystal layer 62 are different, and forming the mixed color of the handwriting board by the different reflection colors;
fixing the three layers of substrates by using spacers, filling a liquid crystal mixture, adding chiral agents with different chiralities to enable the chirality of the liquid crystal layer to be different, and adjusting the concentration of the chiral agents to change the thread pitch to enable the handwriting colors of the two layers of liquid crystal layers to be different;
since the chirality of the liquid crystal layers of these tablets is the same, the pitch between different liquid crystal layers must be very different than that of other multi-layer liquid crystal display tablets, otherwise the reflection of light will be disturbed. In the invention, because the chiral agents are different, the two liquid crystal layers reflect light with different chirality as shown in fig. 4, so that the light does not interfere with each other, and the screw pitch can be adjusted at will.
After filling the liquid crystal polymer, sealing was performed, and then the light intensity was 4.7mw/cm2The electrode layer was then switched into the circuit after 1 hour of uv polymerization.
The circuit is shown in fig. 3, two liquid crystal layer electrodes are connected in parallel to the same power supply 7; a first control switch 21 is provided on the power supply branch of the upper liquid crystal layer 61, a second circuit control switch 22 is provided on the power supply branch of the lower liquid crystal layer 62, and a third circuit control switch 23 is provided on the common branch of the upper liquid crystal layer 61 and the lower liquid crystal layer 62;
when the first circuit control switch 21 controls the power supply branch of the upper liquid crystal layer 61 to be conducted, the color on the upper liquid crystal layer 61 is erased, and at this time, the handwriting board only displays the color of the lower liquid crystal layer 62;
when the second circuit control switch 22 controls the power supply branch of the lower liquid crystal layer 62 to be conducted, the color on the lower liquid crystal layer 62 is erased, and at this time, the handwriting board only displays the color of the upper liquid crystal layer 61;
when the third circuit control switch 23 controls the conduction of the common power supply branch of the upper liquid crystal layer 61 and the lower liquid crystal layer 62, the colors on the upper liquid crystal layer 61 and the lower liquid crystal layer 62 are erased, the same effect can be realized by simultaneously pressing the first circuit control switch 21 and the second circuit control switch 22, and the third circuit control switch control 23 is designed to facilitate the erasure of all handwriting by one key, so that the color adjustment and the three-color conversion are realized, and the interest of the handwriting board is increased.
In the circuit, one layer of the liquid crystal layer can be independently electrified, and the cholesteric liquid crystal is restored to a transparent normal state from a P state, so that only the handwriting color of the other layer of the liquid crystal layer is displayed, the change of the handwriting color is realized, and the purpose of adjusting the handwriting color is achieved.
In the structure of the brightness of the cholesteric liquid crystal handwriting board, the upper liquid crystal surface film substrate 41 and the middle liquid crystal surface film substrate 42 adopt flexible transparent base materials, and the lower liquid crystal surface film substrate 43 adopts a black base material 43.
As shown in fig. 1, the invention can be applied to a writing pad by only providing three control switches 21, 22, 23 and a pen slot 3 on the casing 1.
In summary, the present invention is a double liquid crystal layer structure, in which the chirality of two layers of liquid crystal are different, and can reflect the left-handed light and the right-handed light in the natural light simultaneously, so that the handwriting brightness is greatly improved. The two layers of liquid crystal electrodes are connected in parallel with the same power supply, one-key simultaneous erasing can be realized, and meanwhile, the handwriting color can be changed by independently electrifying. The liquid crystal handwriting board has the advantages of simple structure, simple and convenient control process, high handwriting brightness, variable color, higher diversity of working modes of the liquid crystal handwriting board and interestingness in the using process, stronger functionality, higher applicability and excellent application and popularization values.
Claims (2)
1. A structure for improving the brightness of a cholesteric liquid crystal handwriting board is characterized in that an upper liquid crystal layer (61) and a lower liquid crystal layer (62) with different chiralities are arranged between an upper liquid crystal surface film substrate (41) and a lower liquid crystal surface film substrate (43), and a middle liquid crystal surface film substrate (42) is arranged between the upper liquid crystal layer (61) and the lower liquid crystal layer (62);
setting the chirality of the upper liquid crystal layer (61) and the chirality of the lower liquid crystal layer (62) to be opposite, so that the upper liquid crystal layer (61) and the lower liquid crystal layer (62) can reflect left-handed light and right-handed light simultaneously;
setting the thread pitches of the upper liquid crystal layer (61) and the lower liquid crystal layer (62) to be different, so that the reflection colors of the upper liquid crystal layer (61) and the lower liquid crystal layer (62) are different, and forming the mixed color of the handwriting board by the different reflection colors;
transparent ITO electrodes are respectively arranged on the upper liquid crystal layer (61) and the lower liquid crystal layer (62) and are connected to the same power supply (7) in parallel; a first control switch (21) is arranged on a power supply branch of the upper liquid crystal layer (61), a second circuit control switch (22) is arranged on a power supply branch of the lower liquid crystal layer (62), and a third circuit control switch (23) is arranged on a common branch of the upper liquid crystal layer (61) and the lower liquid crystal layer (62);
when the first circuit control switch (21) controls the power supply branch of the upper liquid crystal layer (61) to be conducted, the color on the upper liquid crystal layer (61) is erased, and the handwriting board only displays the color of the lower liquid crystal layer (62);
when the second circuit control switch (22) controls the power supply branch of the lower liquid crystal layer (62) to be conducted, the color on the lower liquid crystal layer (62) is erased, and the handwriting board only displays the color of the upper liquid crystal layer (61);
when the third circuit controls the switch to control the conduction of the common power supply branch of the upper liquid crystal layer (61) and the lower liquid crystal layer (62), the colors on the upper liquid crystal layer (61) and the lower liquid crystal layer (62) are erased.
2. A structure for improving the brightness of a cholesteric liquid crystal tablet according to claim 1, wherein:
the upper liquid crystal surface film substrate (41) and the middle liquid crystal surface film substrate (42) adopt flexible transparent base materials, and the lower liquid crystal surface film substrate (43) adopts a black base material (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911151202.5A CN110764325A (en) | 2019-11-21 | 2019-11-21 | Structure for improving brightness of cholesteric liquid crystal handwriting board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911151202.5A CN110764325A (en) | 2019-11-21 | 2019-11-21 | Structure for improving brightness of cholesteric liquid crystal handwriting board |
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| Publication Number | Publication Date |
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| CN110764325A true CN110764325A (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911151202.5A Withdrawn CN110764325A (en) | 2019-11-21 | 2019-11-21 | Structure for improving brightness of cholesteric liquid crystal handwriting board |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115373169A (en) * | 2021-05-17 | 2022-11-22 | 肯特显示器公司 | Cholesteric liquid crystal device |
| WO2024051356A1 (en) * | 2022-09-05 | 2024-03-14 | 深圳市唯酷光电有限公司 | Handwriting liquid crystal film and handwriting apparatus |
-
2019
- 2019-11-21 CN CN201911151202.5A patent/CN110764325A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115373169A (en) * | 2021-05-17 | 2022-11-22 | 肯特显示器公司 | Cholesteric liquid crystal device |
| WO2024051356A1 (en) * | 2022-09-05 | 2024-03-14 | 深圳市唯酷光电有限公司 | Handwriting liquid crystal film and handwriting apparatus |
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Application publication date: 20200207 |