CN111443543B - Liquid crystal display panel and brightness regulating and controlling method thereof - Google Patents
Liquid crystal display panel and brightness regulating and controlling method thereof Download PDFInfo
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- CN111443543B CN111443543B CN202010367864.2A CN202010367864A CN111443543B CN 111443543 B CN111443543 B CN 111443543B CN 202010367864 A CN202010367864 A CN 202010367864A CN 111443543 B CN111443543 B CN 111443543B
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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
- G02F1/137—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
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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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
- G02F1/1343—Electrodes
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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
- G02F1/137—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
- G02F1/139—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 orientation effects in which the liquid crystal remains transparent
- G02F1/1396—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 orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
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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
- G02F1/137—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
- G02F1/13712—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 the liquid crystal having negative dielectric anisotropy
Abstract
The invention provides a liquid crystal display panel and a brightness regulation method thereof, wherein the liquid crystal display panel is used for detecting external ultraviolet light and comprises an array substrate, a color film substrate and a cholesteric liquid crystal box; the cholesteric liquid crystal box comprises a plurality of cholesteric liquid crystals, wherein the cholesteric liquid crystals comprise negative nematic liquid crystals and chiral compounds, and the negative nematic liquid crystals and the chiral compounds have the same pitch rotation direction. The cholesteric liquid crystal box in the liquid crystal display panel comprises negative nematic liquid crystal and chiral compounds, and the brightness of the panel is regulated and controlled by utilizing the ultraviolet light induced chiral inversion characteristic of the chiral compounds and the chiral multi-domain vertical alignment (chiral VA) technology.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a liquid crystal display panel and a brightness control method thereof.
Background
Along with the popularization of the application of ultraviolet light in the fields of biological sterilization, disinfection, organic polymerization reaction and the like, the ultraviolet light leakage detection of equipment such as an ultraviolet disinfection cabinet, an ultraviolet polymerization machine and the like is very necessary in view of the great damage of the ultraviolet light to human bodies. The current mode of detecting ultraviolet light leakage generally uses an ultraviolet radiometer to measure the intensity of ultraviolet light. However, this method requires the operator to approach the machine at a short distance to measure, and cannot make an intuitive judgment at a long distance.
The age of information explosion, the display is the most efficient and intuitive carrier for people to read information. Among many flat panel displays, a liquid crystal display is one of the most developed display devices, which has been widely used in display scenes such as televisions, mobile phones, computers, billboards, monitors, education, etc., and has been gradually developed toward the smart display field. However, the conventional liquid crystal display can only control the deflection of the liquid crystal molecules by an electric field to regulate the intensity of light so as to achieve the purpose of display, and can not realize display by other stimulation.
Disclosure of Invention
The invention aims to provide a liquid crystal display panel and a brightness adjusting method thereof, which are used for solving the technical problems that the brightness of the display panel of the existing liquid crystal display is single in mode and the display cannot be realized by other modes.
In order to achieve the above object, the present invention provides a liquid crystal display panel for detecting external ultraviolet light, comprising an array substrate; the color film substrate is arranged opposite to the array substrate; the cholesteric liquid crystal box is arranged between the array substrate and the color film substrate; the cholesteric liquid crystal box comprises a plurality of cholesteric liquid crystals, wherein the cholesteric liquid crystals comprise negative nematic liquid crystals and chiral compounds, and the negative nematic liquid crystals and the chiral compounds have the same pitch rotation direction.
Further, the liquid crystal display panel further comprises a backlight source arranged below the array substrate for generating light; the lower polaroid is arranged below the array substrate and is positioned between the backlight source and the array substrate; the pixel electrode is arranged on the array substrate; and the upper polaroid is arranged on the color film substrate.
Further, the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees; or the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 degrees.
Further, when the pitch rotation direction of the cholesteric liquid crystal is left-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced; on the contrary, when the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the right-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased.
Further, when the pitch rotation direction of the cholesteric liquid crystal is left-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 degrees, the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased; on the contrary, when the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 degrees, the right-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced.
Further, the vibration transmission direction of the lower polarizer is orthogonal to the vibration transmission direction of the upper polarizer.
Further, the twist angle of the cholesteric liquid crystal in the cholesteric liquid crystal cell is in the range of 50 to 90 °.
In order to achieve the above object, the present invention further provides a method for adjusting brightness of a liquid crystal display panel, comprising the steps of: providing a liquid crystal display panel as described above; and applying an electric field to the liquid crystal display panel while irradiating the liquid crystal display panel with ultraviolet light, wherein the cholesteric liquid crystal in the cholesteric liquid crystal cell is subjected to pitch rotation.
Further, in the step of applying an electric field to the liquid crystal display panel while irradiating the liquid crystal display panel with ultraviolet light, when a pitch rotation direction of the cholesteric liquid crystal is left-handed and an angle between a light ray passing through the lower polarizer and the pixel electrode is 60-90 °, the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of the electric field and the ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced; on the contrary, when the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the right-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased.
Further, in the step of applying an electric field to the liquid crystal display panel while irradiating the liquid crystal display panel with ultraviolet light, when a pitch rotation direction of the cholesteric liquid crystal is left-handed and an angle between a light ray passing through the lower polarizer and the pixel electrode is 0-30 °, the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of the electric field and the ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased; on the contrary, when the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 degrees, the right-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced.
The invention has the technical effects that the invention provides the liquid crystal display panel and the brightness regulating method thereof, wherein a cholesteric liquid crystal box in the liquid crystal display panel comprises negative nematic liquid crystal and chiral compounds, and the brightness of the panel is regulated and controlled by the pitch and the rotation direction of the cholesteric liquid crystal in the ultraviolet light control panel by combining the ultraviolet light induced chiral inversion characteristic of the chiral compounds with the chiral multi-domain vertical alignment (chiral VA) technology.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
FIG. 1a is a schematic diagram of the structure of a left-handed cholesteric liquid crystal of example 1.
Fig. 1b is a schematic diagram showing the structure of the increase of the pitch of the left-handed cholesteric liquid crystal of example 1.
FIG. 1c is a schematic diagram of the structure of a nematic liquid crystal according to example 1.
Fig. 1d is a schematic diagram showing the structure of the embodiment 1 in which the pitch of the right-handed cholesteric liquid crystal is reduced.
FIG. 1e is a schematic diagram of the structure of a dextrorotatory cholesteric liquid crystal according to example 1.
Fig. 2 is a schematic diagram showing the brightness change structure of the left-handed cholesteric liquid crystal and the right-handed cholesteric liquid crystal of example 1.
Fig. 3 is a flowchart of a brightness control method of the lcd panel according to embodiment 1.
FIG. 4a is a schematic diagram of the structure of a dextrorotatory cholesteric liquid crystal according to example 3.
FIG. 4b is a schematic diagram of the structure of the embodiment 3 in which the pitch of the right-handed cholesteric liquid crystal is reduced.
FIG. 4c is a schematic diagram of the structure of a nematic liquid crystal according to example 3.
Fig. 4d is a schematic diagram showing the structure of the increase of the pitch of the left-handed cholesteric liquid crystal of example 3.
Fig. 4e is a schematic diagram of the structure of the left-handed cholesteric liquid crystal of example 3.
Fig. 5 is a flowchart of a brightness control method of the lcd panel according to embodiment 3.
The components of the drawings are identified as follows:
100 liquid crystal display panels;
1, a lower polaroid; 2, an array substrate;
a 3 pixel electrode; 4a first alignment film;
5 cholesteric liquid crystal cells; 6 a second alignment film;
7, a color film substrate; 8, a polaroid is arranged on the surface;
9, a backlight source;
51 negative nematic liquid crystal; 52 chiral compound.
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 will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Example 1
As shown in fig. 1a, the present embodiment provides a liquid crystal display panel 100, which is a chiral multi-domain vertical alignment (chiral VA) liquid crystal display panel for ultraviolet light detection. The liquid crystal display panel 100 includes a lower polarizer 1, an array substrate 2, a pixel electrode 3, a first alignment film 4, a cholesteric liquid crystal cell 5, a second alignment film 6, a color film substrate 7, an upper polarizer 8, a backlight module 9, and a backlight 10.
The array substrate 2, the pixel electrode 3, the first alignment film 4, the cholesteric liquid crystal box 5, the second alignment film 6, the color film substrate 7 and the upper polarizer 8 are sequentially arranged above the lower polarizer 1. The vibration transmission direction of the lower polarizer 1 is orthogonal to the vibration transmission direction of the upper polarizer 8, preferably, the vibration transmission direction of the lower polarizer 1 is a horizontal direction, and the vibration transmission direction of the upper polarizer 8 is a vertical direction.
The lower polarizer 1 may be used to modulate light directed to the cholesteric liquid crystal cell 5 into linearly polarized light.
The array substrate 2 is disposed above the lower polarizer, and the array substrate 2 may include a substrate layer, a thin film transistor, a common electrode, a planarization layer, and an anode layer. The thin film transistor may be a low temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor, a solid phase crystallized thin film transistor or other thin film transistors commonly used in display technology. In this embodiment, the array substrate 2 has good light emission uniformity.
The pixel electrode 3 is provided on the upper surface of the array substrate 2, and includes a plurality of display pixel electrodes respectively arranged in a plurality of display pixels. The angle between the light passing through the lower polarizer 1 and the pixel electrode 3 is 60-90 degrees or 0-30 degrees, so that the liquid crystal display panel obtains the maximum transmittance.
The first alignment film 4 is preferably polyimide, and is disposed on the upper surface of the pixel electrode 3.
The cholesteric liquid crystal cell 5 is provided on the upper surface of the first alignment film 4. The twist angle of the cholesteric liquid crystal in the cholesteric liquid crystal cell 5 is in the range of 50 to 90 °. In particular, the twist angle is related to the cell thickness, the nature of the nematic liquid crystal, and the nature and content of the chiral compound. The twist angle=360° d/p of the cholesteric liquid crystal, wherein d is the thickness of the liquid crystal box and p is the pitch of the cholesteric liquid crystal; pitch p=1/(htp×c), HTP is the helical twisting power of the chiral compound, and c is the content of the chiral compound. In this embodiment, the twist angle of the cholesteric liquid crystal is limited to 50-90 °, and d/p may be limited to 0.139-0.25, so that the cholesteric liquid crystal has optical properties such as optical rotation, selective light scattering, and circular polarization dichroism.
Further, the cholesteric liquid crystal cell 5 includes a plurality of cholesteric liquid crystals including a negative nematic liquid crystal 51 and a chiral compound 52, the negative nematic liquid crystal 51 and the chiral compound 52 having the same pitch rotation direction. Specifically, chiral compound 52 has photoisomerization, including at least one of chiral spiroalkene, chiral diarylethene, chiral azo, chiral dense ring structure. The chiral compound 52 has the advantages of remote non-direct contact, environmental change adaptation and other performance regulation and control, and thus has attracted extensive research interests in the fields of optical driving, optical communication, biosensing and the like. In this embodiment, a diarylethene compound is taken as an example, as shown in formula (1), and the left-handed open-loop chiral diarylethene has the characteristic of cyclizing under ultraviolet light and is converted into the right-handed closed-loop chiral diarylethene; conversely, a right-handed closed-loop chiral diarylethene can be reversibly converted to a left-handed open-loop chiral diarylethene under visible light.
The second alignment film 6 is preferably polyimide and is provided on the upper surface of the cholesteric liquid crystal cell 5.
The color film substrate 7 is disposed on the upper surface of the second alignment film 6, and includes a glass substrate, a black matrix, a color pixel layer, a common electrode layer, and the like.
The upper polarizer 8 is arranged on the upper surface of the color film substrate 7. When the liquid crystal display panel is electrified, an electric field is formed between the upper polarizer 8 and the common electrode of the array substrate 2, so that the liquid crystal is deflected to reduce the contrast ratio.
The backlight 9 is arranged below the lower polarizer. The light generated by the backlight 9 can pass through the liquid crystal display panel and be projected to the eyes of the user.
Before voltage is applied to the display panel, cholesteric liquid crystals in the cholesteric liquid crystal box are arranged perpendicular to the array substrate and the color film substrate, an electric field is formed between the array substrate and the color film substrate after the voltage is applied, the cholesteric liquid crystals in the cholesteric liquid crystal box are spirally poured, and the screw pitch rotation direction of the cholesteric liquid crystals can be left-handed or right-handed, that is, the liquid crystal display panel can be in a bright state or a dark state.
In actual operation, the liquid crystal display panel is electrified, that is, voltage is applied to the array substrate and the color film substrate, and the spiral direction of cholesteric liquid crystal in the cholesteric liquid crystal box is preset to be left-handed, so that the liquid crystal display panel is in a bright state. When the pitch rotation direction of the cholesteric liquid crystal is left-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced.
Specifically, as shown in fig. 1a to 1e, when the liquid crystal display panel 100 is powered on, the spiral direction of the cholesteric liquid crystal in the cholesteric liquid crystal cell 5 is left-handed, the ultraviolet light irradiates the upper polarizer 8, and under the driving of the electric field and the ultraviolet light, the pitch of the left-handed cholesteric liquid crystal is gradually increased in the process of gradually converting the left-handed cholesteric liquid crystal into nematic liquid crystal, and the pitch of the left-handed cholesteric liquid crystal is gradually converted into parallel liquid crystal molecules, namely nematic liquid crystal, and is infinite. Along with the duration of ultraviolet light radiation, the nematic liquid crystal is converted from parallel liquid crystal molecules into dextrorotatory cholesteric liquid crystal, and the pitch of the dextrorotatory cholesteric liquid crystal is smaller and smaller in the conversion process. Further, the negative nematic liquid crystal 51 rotates in the same pitch rotation direction as the chiral compound 52, and preferably, the negative nematic liquid crystal 51 rotates with the pitch of the chiral compound 52. When the liquid crystal display panel 100 is energized, light generated by the backlight 9 enters the cholesteric liquid crystal cell 5 through the array substrate 2 and the pixel electrode 3 from the lower polarizer 1. Specifically, when the pitch rotation direction of the cholesteric liquid crystal is left-handed, the light generated by the backlight 9 passes through the lower polarizer 1, and the angle between the light and the pixel electrode 3 is 60-90 °, so that more light passes through the pixel electrode 3 and acts on the cholesteric liquid crystal. When the left-handed cholesteric liquid crystal is slowly converted into the nematic liquid crystal, the light passing through the lower polarizer 1 is perpendicular to the upper polarizer. When the pitch rotation direction of the cholesteric liquid crystal is changed from left rotation to right rotation, the twist angle range of the cholesteric liquid crystal in the cholesteric liquid crystal box 5 is 50-90 degrees, namely, the twist angle range is changed from 0 degrees to 50-90 degrees, at the moment, the angle of light passing through the pixel electrode 3 is changed, namely, the angle of the light and the cholesteric liquid crystal is changed, so that less light and lower transmittance penetrate through the upper polaroid 8, and with the increase of the ultraviolet radiation time length, the display brightness of the liquid crystal display panel can be intuitively observed to be gradually reduced by human eyes, namely, the liquid crystal display panel is changed from a bright state to a dark state, and the brightness regulation of the liquid crystal display panel is realized. In other words, the person skilled in the art can control the pitch and the rotation direction of cholesteric liquid crystal molecules in the liquid crystal display panel by ultraviolet light to adjust the brightness of the panel. The liquid crystal display panel provided by the embodiment achieves the purpose of detecting ultraviolet light by regulating and controlling the brightness of the liquid crystal display panel.
The present embodiment provides a liquid crystal display panel, which is a chiral multi-domain vertical alignment type liquid crystal display panel (chiral VA), and the brightness of the liquid crystal display panel is related to not only the tilting degree of liquid crystal molecules, i.e. the voltage between the array substrate and the color film substrate, but also the spiral twist direction of cholesteric liquid crystal in the panel, i.e. the rotation direction of chiral compound. As shown in fig. 2, the brightness change of the left-handed cholesteric liquid crystal and the right-handed cholesteric liquid crystal is reversed. That is, the brightness of the chiral VA panel can be controlled by controlling the chiral direction of the cholesteric liquid crystal, i.e., the chiral compound.
The embodiment also provides a brightness control method of the liquid crystal display panel, and the method is applied to the liquid crystal display panel.
As shown in fig. 3, the brightness control method of the liquid crystal display panel includes the following steps S11 to S12. )
S11) providing a liquid crystal display panel. The liquid crystal display panel is the liquid crystal display panel, and comprises a lower polarizer, an array substrate, a pixel electrode, a first alignment film, a cholesteric liquid crystal box, a second alignment film, a color film substrate, an upper polarizer, a backlight module and a backlight source. The color film substrate and the array substrate are oppositely arranged; the cholesteric liquid crystal box is arranged between the array substrate and the color film substrate; the cholesteric liquid crystal box comprises a plurality of cholesteric liquid crystals, wherein the cholesteric liquid crystals comprise negative nematic liquid crystals and chiral compounds, and the negative nematic liquid crystals and the chiral compounds have the same pitch rotation direction.
S12) applying an electric field to the liquid crystal display panel while irradiating the liquid crystal display panel with ultraviolet light, the cholesteric liquid crystal in the cholesteric liquid crystal cell being pitch-rotated. When the pitch rotation direction of the cholesteric liquid crystal is left-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced.
As shown in fig. 1a to 1e, when the lcd panel 100 is powered on, the spiral direction of the cholesteric liquid crystal in the cholesteric liquid crystal cell 5 is left-handed, the ultraviolet light irradiates the upper polarizer 8, and the pitch of the left-handed cholesteric liquid crystal is gradually increased during the process of gradually converting the left-handed cholesteric liquid crystal into nematic liquid crystal under the driving of the electric field and the ultraviolet light, and the pitch of the left-handed cholesteric liquid crystal is slowly converted into parallel liquid crystal molecules, i.e., nematic liquid crystal, and is infinite. As the duration of uv radiation increases, the nematic liquid crystal changes from parallel liquid crystal molecules to dextrorotatory cholesteric liquid crystals, which have smaller pitches during the change to dextrorotatory cholesteric liquid crystals.
When the liquid crystal display panel 100 is energized, light generated by the backlight 9 enters the cholesteric liquid crystal cell 5 through the array substrate 2 and the pixel electrode 3 from the lower polarizer 1. Specifically, when the pitch rotation direction of the cholesteric liquid crystal is left-handed, the light generated by the backlight 9 passes through the lower polarizer 1, and the angle between the light and the pixel electrode 3 is 60-90 °, so that more light passes through the pixel electrode 3 and acts on the cholesteric liquid crystal. When the left-handed cholesteric liquid crystal is slowly converted into the nematic liquid crystal, the light passing through the lower polarizer 1 is perpendicular to the upper polarizer. When the pitch rotation direction of the cholesteric liquid crystal is changed from left rotation to right rotation, the twist angle range of the cholesteric liquid crystal in the cholesteric liquid crystal box 5 is 50-90 degrees, namely, the twist angle range is changed from 0 degrees to 50-90 degrees, at the moment, the angle of the light passing through the pixel electrode 3 is changed, so that less light passes through the upper polarizer 8, the penetration rate is lower, and along with the increase of the ultraviolet radiation time length, the display brightness of the liquid crystal display panel can be intuitively observed to be gradually reduced by human eyes, namely, the liquid crystal display panel is changed from a bright state to a dark state, and the brightness regulation of the liquid crystal display panel is realized. In other words, the person skilled in the art can control the pitch and the rotation direction of cholesteric liquid crystal molecules in the liquid crystal display panel by ultraviolet light to adjust the brightness of the panel. The liquid crystal display panel provided by the embodiment achieves the purpose of detecting ultraviolet light by regulating and controlling the brightness of the liquid crystal display panel.
The embodiment provides a liquid crystal display panel and a brightness control method thereof, wherein a cholesteric liquid crystal box in the liquid crystal display panel comprises negative nematic liquid crystal and chiral compounds, and the brightness of the panel is controlled from a bright state to a dark state by combining ultraviolet light induced chiral inversion characteristics of the chiral compounds with chiral multi-domain vertical alignment (chiral VA) technology.
Example 2
The present embodiment provides a liquid crystal display panel and a brightness adjusting method thereof, including most of the technical solutions of embodiment 1, wherein when the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 °, the right-handed cholesteric liquid crystal is gradually transformed into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced.
Specifically, when the pitch rotation direction of the cholesteric liquid crystal is right-handed, the light generated by the backlight source passes through the lower polarizer, and the angle between the light and the pixel electrode is 0-30 degrees, so that a part of the light passes through the pixel electrode and acts on the cholesteric liquid crystal. When the right-handed cholesteric liquid crystal is slowly converted into the nematic liquid crystal, the light passing through the lower polarizer is perpendicular to the upper polarizer. When the pitch rotation direction of the cholesteric liquid crystal is changed from right rotation to left rotation, the twist angle range of the cholesteric liquid crystal in the cholesteric liquid crystal box is 50-90 degrees, namely, the twist angle range is changed from 0 degrees to 50-90 degrees, at the moment, the angle of light passing through the pixel electrode is changed, namely, the angle of the light and the cholesteric liquid crystal is changed, so that less light and lower transmissivity penetrate through the upper polaroid, and along with the increase of the ultraviolet radiation duration, the human eye can intuitively observe that the display brightness of the liquid crystal display panel is gradually reduced, namely, the display brightness is changed from a bright state to a dark state, and the brightness regulation of the liquid crystal display panel is realized.
Example 3
The present embodiment provides a liquid crystal display panel and a brightness adjusting method thereof, including most of the technical solutions of embodiment 1, wherein when the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 °, the right-handed cholesteric liquid crystal is gradually transformed into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased.
In actual operation, the liquid crystal display panel is electrified, that is, voltage is applied to the array substrate and the color film substrate, and the spiral direction of cholesteric liquid crystal in the cholesteric liquid crystal box is preset to be right-handed, so that the liquid crystal display panel is in a dark state. When the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the right-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased.
Specifically, as shown in fig. 4a to 4e, when the liquid crystal display panel 100 is powered on, the spiral direction of the cholesteric liquid crystal in the cholesteric liquid crystal cell 5 is right-handed, the ultraviolet light irradiates the upper polarizer 8, and under the driving of the electric field and the ultraviolet light, the pitch of the right-handed cholesteric liquid crystal is gradually increased in the process of gradually converting the right-handed cholesteric liquid crystal into nematic liquid crystal, and the right-handed cholesteric liquid crystal is slowly converted into parallel liquid crystal molecules, namely nematic liquid crystal, and the pitch of the nematic liquid crystal is infinite. As the duration of uv radiation increases, the nematic liquid crystal is transformed from parallel liquid crystal molecules to a left-handed cholesteric liquid crystal, and during the transformation, the pitch of the left-handed cholesteric liquid crystal becomes smaller and smaller. Further, the negative nematic liquid crystal 51 rotates in the same pitch rotation direction as the chiral compound 52, and preferably, the negative nematic liquid crystal 51 rotates with the pitch of the chiral compound 52.
When the liquid crystal display panel 100 is energized, light generated by the backlight 9 enters the cholesteric liquid crystal cell 5 through the array substrate 2 and the pixel electrode 3 from the lower polarizer 1. When the pitch rotation direction of the cholesteric liquid crystal is right-handed, the light generated by the backlight 9 passes through the lower polarizer 1, and the angle between the light and the pixel electrode 3 is 60-90 degrees, so that more light passes through the pixel electrode 3 and acts on the cholesteric liquid crystal. When the right-handed cholesteric liquid crystal is slowly converted into the nematic liquid crystal, the light passing through the lower polarizer 1 is perpendicular to the upper polarizer. When the pitch rotation direction of the cholesteric liquid crystal is changed from right to left, the twist angle range of the cholesteric liquid crystal in the cholesteric liquid crystal box 5 is 50-90 degrees, namely, the twist angle range is changed from 0 degrees to 50-90 degrees, at this time, the angle of the light passing through the pixel electrode 3 is changed, so that more light passes through the upper polarizer 8, the transmittance is higher, and with the increase of the ultraviolet radiation time length, the display brightness of the liquid crystal display panel can be intuitively observed to gradually increase by human eyes, namely, the display brightness is changed from a dark state to a bright state, so that the brightness regulation of the liquid crystal display panel is realized. In other words, the person skilled in the art can control the pitch and the rotation direction of cholesteric liquid crystal molecules in the liquid crystal display panel by ultraviolet light to adjust the brightness of the panel. The liquid crystal display panel provided by the embodiment achieves the purpose of detecting ultraviolet light by regulating and controlling the brightness of the liquid crystal display panel.
The embodiment also provides a brightness control method of the liquid crystal display panel, and the method is applied to the liquid crystal display panel.
As shown in fig. 5, the brightness control method of the liquid crystal display panel includes the following steps S21 to S22).
S21) providing a liquid crystal display panel. The liquid crystal display panel is the liquid crystal display panel, and comprises a lower polarizer, an array substrate, a pixel electrode, a first alignment film, a cholesteric liquid crystal box, a second alignment film, a color film substrate, an upper polarizer, a backlight module and a backlight source. The color film substrate and the array substrate are oppositely arranged; the cholesteric liquid crystal box is arranged between the array substrate and the color film substrate; the cholesteric liquid crystal box comprises a plurality of cholesteric liquid crystals, wherein the cholesteric liquid crystals comprise negative nematic liquid crystals and chiral compounds, and the negative nematic liquid crystals and the chiral compounds have the same pitch rotation direction.
S22) applying an electric field to the liquid crystal display panel while irradiating the liquid crystal display panel with ultraviolet light, the cholesteric liquid crystal in the cholesteric liquid crystal cell being pitch-rotated. When the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the right-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased.
As shown in fig. 4a to 4e, when the lcd panel 100 is powered on, the spiral direction of the cholesteric liquid crystal in the cholesteric liquid crystal cell 5 is right-handed, the ultraviolet light irradiates the upper polarizer 8, and the pitch of the right-handed cholesteric liquid crystal is gradually increased and the right-handed cholesteric liquid crystal is slowly changed into parallel liquid crystal molecules, i.e. nematic liquid crystal, with infinite pitch in the process of gradually changing the right-handed cholesteric liquid crystal into nematic liquid crystal under the driving of the electric field and the ultraviolet light. As the duration of uv radiation increases, the nematic liquid crystal is transformed from parallel liquid crystal molecules to a left-handed cholesteric liquid crystal, and during the transformation, the pitch of the left-handed cholesteric liquid crystal becomes smaller and smaller. Further, the negative nematic liquid crystal 51 rotates in the same pitch rotation direction as the chiral compound 52, and preferably, the negative nematic liquid crystal 51 rotates with the pitch of the chiral compound 52.
When the liquid crystal display panel 100 is energized, light generated by the backlight 9 enters the cholesteric liquid crystal cell 5 through the array substrate 2 and the pixel electrode 3 from the lower polarizer 1. When the pitch rotation direction of the cholesteric liquid crystal is right-handed, the light generated by the backlight 9 passes through the lower polarizer 1, and the angle between the light and the pixel electrode 3 is 60-90 degrees, so that more light passes through the pixel electrode 3 and acts on the cholesteric liquid crystal. When the right-handed cholesteric liquid crystal is slowly converted into the nematic liquid crystal, the light passing through the lower polarizer 1 is perpendicular to the upper polarizer. When the pitch rotation direction of the cholesteric liquid crystal is changed from right to left, the twist angle range of the cholesteric liquid crystal in the cholesteric liquid crystal box 5 is 50-90 degrees, namely, the twist angle range is changed from 0 degrees to 50-90 degrees, at this time, the angle of the light passing through the pixel electrode 3 is changed, so that more light passes through the upper polarizer 8, the transmittance is higher, and with the increase of the ultraviolet radiation time length, the display brightness of the liquid crystal display panel can be intuitively observed to gradually increase by human eyes, namely, the display brightness is changed from a dark state to a bright state, so that the brightness regulation of the liquid crystal display panel is realized. In other words, the person skilled in the art can control the pitch and the rotation direction of cholesteric liquid crystal molecules in the liquid crystal display panel by ultraviolet light to adjust the brightness of the panel. The liquid crystal display panel provided by the embodiment achieves the purpose of detecting ultraviolet light by regulating and controlling the brightness of the liquid crystal display panel.
Example 4
The present embodiment provides a liquid crystal display panel and a brightness adjusting method thereof, including most of the technical solutions of embodiment 1, wherein when the pitch rotation direction of the cholesteric liquid crystal is left-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 °, the left-handed cholesteric liquid crystal is gradually transformed into nematic liquid crystal under the driving of the electric field and the ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased.
Specifically, when the pitch rotation direction of the cholesteric liquid crystal is left-handed, the light generated by the backlight source passes through the lower polarizer, and the angle between the light and the pixel electrode is 0-30 degrees, so that a part of the light passes through the pixel electrode and acts on the cholesteric liquid crystal. When the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal, the light passing through the lower polarizer is perpendicular to the upper polarizer. When the pitch rotation direction of the cholesteric liquid crystal is changed from left rotation to right rotation, the twist angle range of the cholesteric liquid crystal in the cholesteric liquid crystal box is 50-90 degrees, namely, the twist angle range is changed from 0 degrees to 50-90 degrees, at the moment, the angle of the light passing through the pixel electrode is changed, so that more light passes through the upper polaroid 8, the transmittance is higher, and along with the increase of the ultraviolet radiation time length, the display brightness of the liquid crystal display panel can be intuitively observed to be gradually reduced and increased by human eyes, namely, the liquid crystal display panel is changed from a dark state to a bright state, and the brightness regulation and control of the liquid crystal display panel are realized.
The invention has the technical effects that the invention provides the liquid crystal display panel and the brightness regulating method thereof, wherein a cholesteric liquid crystal box in the liquid crystal display panel comprises negative nematic liquid crystal and chiral compounds, and the brightness of the panel is regulated and controlled by the pitch and the rotation direction of the cholesteric liquid crystal in the ultraviolet light control panel by combining the ultraviolet light induced chiral inversion characteristic of the chiral compounds with the chiral multi-domain vertical alignment (chiral VA) technology.
The embodiment of the invention provides a liquid crystal display panel and a brightness regulation method thereof, wherein a cholesteric liquid crystal box in the liquid crystal display panel comprises negative nematic liquid crystal and chiral compounds, and the brightness of the panel is regulated from a dark state to a bright state by combining ultraviolet light induced chiral inversion characteristics of the chiral compounds with chiral multi-domain vertical alignment (chiral VA) technology.
The above describes a liquid crystal display panel and the brightness control method thereof provided in the embodiments of the present application in detail, and specific examples are applied to describe the principles and embodiments of the present application, and the description of the above embodiments is only used to help understand the technical solution and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (6)
1. A liquid crystal display panel for detecting external ultraviolet light, comprising:
an array substrate;
the color film substrate is arranged opposite to the array substrate; the cholesteric liquid crystal box is arranged between the array substrate and the color film substrate; the cholesteric liquid crystal box comprises a plurality of cholesteric liquid crystals, wherein the cholesteric liquid crystals comprise negative nematic liquid crystals and chiral compounds, and the pitch rotation directions of the negative nematic liquid crystals and the chiral compounds are the same;
the backlight source is arranged below the array substrate and used for generating light rays;
the lower polaroid is arranged below the array substrate and is positioned between the backlight source and the array substrate;
the pixel electrode is arranged on the array substrate; and
the upper polaroid is arranged on the color film substrate;
wherein, the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees;
when the pitch rotation direction of the cholesteric liquid crystal is left-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the drive of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced; on the contrary, when the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the right-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased.
2. A liquid crystal display panel for detecting external ultraviolet light, comprising:
an array substrate;
the color film substrate is arranged opposite to the array substrate; the cholesteric liquid crystal box is arranged between the array substrate and the color film substrate; the cholesteric liquid crystal box comprises a plurality of cholesteric liquid crystals, wherein the cholesteric liquid crystals comprise negative nematic liquid crystals and chiral compounds, and the pitch rotation directions of the negative nematic liquid crystals and the chiral compounds are the same;
the backlight source is arranged below the array substrate and used for generating light rays;
the lower polaroid is arranged below the array substrate and is positioned between the backlight source and the array substrate;
the pixel electrode is arranged on the array substrate; and
the upper polaroid is arranged on the color film substrate;
wherein, the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 degrees;
when the pitch rotation direction of the cholesteric liquid crystal is left-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 degrees, the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the drive of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased; on the contrary, when the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 degrees, the right-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced.
3. The liquid crystal display panel according to claim 1 or 2, wherein,
the vibration transmission direction of the lower polaroid is orthogonal to the vibration transmission direction of the upper polaroid.
4. The liquid crystal display panel according to claim 1, wherein,
the twist angle of the cholesteric liquid crystal in the cholesteric liquid crystal box is 50-90 degrees.
5. The brightness regulating method of the liquid crystal display panel is characterized by comprising the following steps of:
providing the liquid crystal display panel of claim 1; and
applying an electric field to the liquid crystal display panel, and simultaneously irradiating the liquid crystal display panel by using ultraviolet light, wherein cholesteric liquid crystal in the cholesteric liquid crystal box rotates in pitch;
when the pitch rotation direction of the cholesteric liquid crystal is left-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the drive of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced; on the contrary, when the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 60-90 degrees, the right-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased.
6. The brightness regulating method of the liquid crystal display panel is characterized by comprising the following steps of:
providing the liquid crystal display panel of claim 2; and
applying an electric field to the liquid crystal display panel, and simultaneously irradiating the liquid crystal display panel by using ultraviolet light, wherein cholesteric liquid crystal in the cholesteric liquid crystal box rotates in pitch;
when the pitch rotation direction of the cholesteric liquid crystal is left-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 degrees, the left-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the drive of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into right-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually increased; on the contrary, when the pitch rotation direction of the cholesteric liquid crystal is right-handed and the angle between the light passing through the lower polarizer and the pixel electrode is 0-30 degrees, the right-handed cholesteric liquid crystal is gradually converted into nematic liquid crystal under the driving of an electric field and ultraviolet light, the nematic liquid crystal is gradually inverted into left-handed cholesteric liquid crystal, and the brightness of the liquid crystal display panel is gradually reduced.
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