CN111290160A - Display structure and display device - Google Patents
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- CN111290160A CN111290160A CN202010244230.8A CN202010244230A CN111290160A CN 111290160 A CN111290160 A CN 111290160A CN 202010244230 A CN202010244230 A CN 202010244230A CN 111290160 A CN111290160 A CN 111290160A
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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
- G02F1/133377—Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
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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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
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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
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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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
- G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
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Abstract
The present invention provides a display structure and a display device, including: the liquid crystal display device includes a first substrate, a second substrate, and a plurality of electrode devices between the first substrate and the second substrate, each electrode device configured to generate an electric field in a specific direction, and a mixed solution of quantum rods and liquid crystal molecules sealed in each electrode device, the quantum rods in the mixed solution being deflected in response to the electric field generated by the electrode device. Therefore, the quantum rods can be aligned and arranged in different degrees by applying electric fields with different frequencies and intensities, so that light sources with different polarization degrees are obtained, and the quantum rod light source device is simple in structure, high in energy utilization rate and high in light emitting efficiency.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display structure and a display device.
Background
In the field of display technology, liquid crystal display panels are widely used in modern digital information equipment due to their advantages of small size, low power consumption, no radiation, high resolution, and the like.
The existing liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer positioned between the array substrate and the color film substrate, wherein an upper polarizer is arranged above the color film substrate, and a lower polarizer is arranged below the array substrate, so that polarized light is prepared, and the energy utilization rate is low. The display device includes a display panel and a backlight unit including a light source, a light guide plate, a reflective plate and a plurality of optical films, and the liquid crystal does not emit light and thus has low luminous efficiency.
Disclosure of Invention
The invention aims to provide a display structure and a display device, which can be used for preparing polarized light sources with different polarization degrees by applying voltage to a quantum rod and liquid crystal mixed solution through an electrode device to drive the directional arrangement of the quantum rod and liquid crystal molecules, and have the advantages of simple structure, high energy utilization rate and high luminous efficiency.
In one aspect, the present invention provides a display structure comprising:
a first substrate;
a second substrate positioned above the first substrate and parallel to the first substrate;
a plurality of electrode devices positioned between the first and second substrates and adjacently arranged in a first lateral direction parallel to the first substrate, each of the electrode devices configured to generate an electric field in a specific direction;
and a mixed solution of quantum rods and liquid crystal molecules sealed in each of the electrode devices, the quantum rods in the mixed solution being deflected in response to an electric field generated by the electrode devices.
It is further preferred that each of the electrode devices includes first and second electrodes arranged at intervals along the first transverse direction, the first and second electrodes being arranged between the first and second substrates along a first longitudinal direction perpendicular to the first substrate, the electrode devices being configured to generate an electric field parallel to the first transverse direction.
Further preferably, the display device further comprises a polarizer located on the second substrate, and a transmission axis direction of the polarizer is consistent with a second transverse direction parallel to the first substrate and perpendicular to the first transverse direction.
Further preferably, the light emitting wavelengths of the quantum rods in the same electrode device are the same, each electrode device corresponds to one pixel region, and the light emitting wavelengths of the quantum rods in the electrode devices corresponding to the pixel regions with different colors are different, where the light emitting wavelength of the quantum rod corresponding to the red pixel region is a red light wavelength, the light emitting wavelength of the quantum rod corresponding to the green pixel region is a green light wavelength, and the light emitting wavelength of the quantum rod corresponding to the blue pixel region is a blue light wavelength.
Further preferably, the liquid crystal display device further comprises a light source cut-off film located between the second substrate and the polarizer.
Further preferably, the materials of the quantum rod include a luminescent core, an inorganic protective shell, a high-stability composite quantum rod, and a perovskite quantum rod.
Further preferably, the liquid crystal display device further comprises an alignment film on the first substrate, wherein the alignment direction of the alignment film is the second transverse direction.
Further preferably, the distance between the first electrode and the second electrode is between 3 and 100 μm, and the aspect ratio of the quantum rod is between 3: 1 to 15: 1, the radial diameter of the quantum rod is between 2 and 10 nm.
Further preferably, the liquid crystal display device further comprises a controller, wherein the controller is controlled whether to apply voltage to the electrode device, when the controller applies voltage to the electrode device and the polarization degree of the quantum rod is the maximum, the required electric field frequency is 1 to 30KHz, the electric field intensity is 20 to 30V/mum, and the quantum rod and the liquid crystal molecules are aligned along the first transverse direction; when the controller does not apply a voltage to the electrode device and the polarization degree of the quantum rod is 0, the quantum rod and the liquid crystal molecules are randomly oriented.
In another aspect, the present invention provides a display device, including the display structure as described in any one of the above and a backlight unit located below the display structure, the backlight unit being configured to provide backlight to the display structure.
The invention has the beneficial effects that: provided are a display structure and a display device including: the liquid crystal display device comprises a first substrate, a second substrate and a plurality of electrode devices which are located between the first substrate and the second substrate and are adjacently arranged along a first transverse direction parallel to the first substrate, wherein each electrode device is configured to generate an electric field with a specific direction, and a mixed solution of quantum rods and liquid crystal molecules is sealed in each electrode device, and the quantum rods in the mixed solution are deflected in response to the electric fields generated by the electrode devices. Therefore, the quantum rods can be aligned and arranged in different degrees by applying electric fields with different frequencies and intensities, so that light sources with different polarization degrees can be obtained, polarized light does not need to be prepared through a lower polarizer, and the quantum rod light source device is simple in structure, high in energy utilization rate and high in luminous efficiency.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic cross-sectional view of a display structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the alignment of quantum rods under different electric field application conditions provided by an embodiment of the present invention;
FIG. 3 is a schematic top view of a display structure in the darkest state according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view illustrating a display structure in a brightest state according to another embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any 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 invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
The Quantum Dots (QDs) have the characteristics of small size, high brightness, high luminous efficiency, pure luminous color spectrum, adjustable luminous color and the like, so that the Quantum Dots are very consistent with the development trend of ultrathin, high-brightness and high-color gamut in the technical field of display, and the QD display technology shows a larger color gamut interval and better color saturation; QD also has the advantages of solution-processable and stable properties, and thus has become the most potential new display technology material in recent years.
Referring to fig. 1, fig. 1 is a schematic cross-sectional view of a display structure 100 according to an embodiment of the present invention, where the display structure includes a first substrate 101, a second substrate 102 located above the first substrate 101 and parallel to the first substrate 101, a plurality of electrode devices 103 located between the first substrate 101 and the second substrate 102 and adjacently arranged along a first lateral direction parallel to the first substrate 101, each electrode device 103 is configured to generate an electric field in a specific direction, a mixed solution of a quantum rod 106 and liquid crystal molecules 107 sealed in each electrode device 103, and the quantum rod 106 in the mixed solution deflects in response to the electric field generated by the electrode device 103.
The first substrate 101 may be a thin film transistor array substrate, and the second substrate 102 may be a glass substrate.
In the present embodiment, three electrode devices 103 are listed, the number of the electrode devices 103 may be determined according to the requirement of the actual display structure, each electrode device 103 includes a first electrode 104 and a second electrode 105 arranged at intervals along the first transverse direction, the first electrode 104 and the second electrode 105 are arranged between the first substrate 101 and the second substrate 102 along the first longitudinal direction perpendicular to the first substrate 101, that is, two adjacent electrode devices 103 share one first electrode 104 or one second electrode 105, and the first electrode 104 and the second electrode 105 can generate an electric field parallel to the first transverse direction.
In other embodiments, the first electrode 104 and the second electrode 105 may be respectively located on the first substrate 101 and under the second substrate 102, and both are parallel to the first transverse direction, in which case the first electrode 104 and the second electrode 105 may generate an electric field component parallel to the first transverse direction and an electric field component perpendicular to the first substrate 101, and the quantum rod 106 and the liquid crystal molecule 107 are driven to deflect, in which case the power consumption is relatively large, and both sides of the electrode device 103 need to be encapsulated with other materials.
In this embodiment, the distance between the first electrode 104 and the second electrode 105 is 3-100 μm, and the aspect ratio of the quantum rod 106 is 3: 1-15: 1, the radial diameter of the quantum rod is between 2 and 10 nm. The liquid crystal molecules 107 only need to have sensitive electric field responsiveness and strong anchoring force with the quantum rods 106, so as to assist the quantum rods 106 to move.
The quantum rod 106 may be of a core-shell structure, primarily with rod-in-rod (dot)And rod-in-rod (rod). Among them, dot-in-rod has a maximum degree of polarization of 0.75, and rod-in-rod has a larger anisotropy, so that it can achieve a higher degree of polarization (0.83), and thus polarized light by the quantum rod 106 can achieve a higher degree of polarization, and thus can be used as a light source for display. Wherein the material of the quantum rod 106 comprises a luminescent core and an inorganic protective shell, the luminescent core comprises ZnCdSe2,InP,Cd2Sse,CdSe,Cd2SeTe and InAs, and the inorganic protective shell layer comprises CdS, ZnSe, ZnCdS2One or more of ZnS, ZnO and the like.
The quantum rod 106 may also include a high stability composite quantum rod (hydrogel loaded QD structure, CdSe-SiO)2Etc.), and perovskite quantum rods.
In the mixed solution of the quantum rod 106 and the liquid crystal molecules 107, the related quantum rod dispersion medium comprises a colorless and transparent high-boiling-point and non-volatile organic or inorganic reagent, and the related quantum rod surface ligands comprise common QD organic ligands (amine, acid, thiol, organic phosphorus, and the like).
The quantum rod 106 as a preferred material for preparing polarized light depends on its structure and characteristics, and on one hand, the quantum rod 106 has optical anisotropy, i.e. polarized light emission characteristics along the long axis direction of the quantum rod 106, due to its structure and dielectric anisotropy, so the quantum rod 106 is a good material choice for preparing polarized light source. The polarization of the quantum rod 106 is closely related to its aspect ratio, which is measured from 1: 1 to 2: 1, the degree of polarization is rapidly changed from 0 to 0.75, and then the aspect ratio is continuously increased, but the degree of polarization is not obviously changed, but the dielectric anisotropy is increased, so that the aspect ratio of the embodiment of the invention is selected to be 3: 1-15: 1.
On the other hand, since the quantum rod 106 has a non-centrosymmetric lattice structure, the quantum rod 106 obtains a large permanent dipole moment along the wurtzite c-axis. Furthermore, the large dielectric constant of the quantum rod 106 generates a dipole moment proportional to the magnitude of the applied electric field. Meanwhile, under the action of an external electric field, the quantum rod can generate torsion force induced by the electric field, so that the long axis of the quantum rod is directionally arranged along the electric field lines.
In the present embodiment, the display structure further includes a controller (not shown in the figure) that controls whether or not to apply a voltage to the electrode device 103. The embodiment of the invention utilizes the alternating current electric field to drive the oriented arrangement of the quantum rod 106 in the mixed solution of the quantum rod 106 and the liquid crystal molecules 107, and simultaneously utilizes the sensitive electric field responsiveness of the liquid crystal molecules 107 and the strong anchoring force between the liquid crystal molecules 107 and the quantum rod 106 to further improve the alignment degree of the quantum rod under the alternating current electric field.
The alignment degree in the embodiment of the present invention refers to the alignment degree of the quantum rod 106 with the direction of the electric field lines (the first transverse direction), that is, the included angle between the long axis of the quantum rod 106 and the first transverse direction is smaller, and the alignment degree is larger.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating the alignment degree of the quantum rod under different electric field application conditions according to an embodiment of the present invention, wherein the mixed solution of the quantum rod 106 and the liquid crystal molecules 107 is between the first electrode 104 and the second electrode 105. When the electrodes are not energized, the quantum rods 106 are randomly oriented, so the polarization degree of the solution is zero at this time; when a weaker electric field with a specific frequency (1-30KHz) is applied to the electrodes, the electric field starts to drive the liquid crystal molecules and the quantum rods to be arranged along the electric field direction (first transverse direction), and the alignment degree of the quantum rods is continuously increased along with the increase of the electric field intensity, so that the polarization degree of the solution is continuously improved until the electric field intensity reaches the maximum value (20-30V/mum), and then the polarization degree is not further increased along with the electric field intensity, and at the moment, the polarization direction of light emitted by the quantum rods is the first transverse direction.
The number and the distribution position of the quantum rods 106 and the liquid crystal molecules 107 are not limited by the embodiment, the present embodiment mainly focuses on the distribution direction, and the present embodiment shows that the quantum rods 106 and the liquid crystal molecules 107 are alternately distributed in the first longitudinal direction.
In this embodiment, the display structure 100 may further include a polarizer 110 disposed on the second substrate 102, referring to fig. 3, fig. 3 is a schematic top view of the display structure in the darkest state according to the embodiment of the present invention, in which an absorption axis direction P1 of the polarizer 110 is consistent with a first transverse direction, and a transmission axis direction P2 of the polarizer 110 is consistent with a second transverse direction parallel to the first substrate 101 and perpendicular to the first transverse direction. As shown in fig. 3, when the applied electric field frequency is 1 to 30KHz, the electric field intensity is 20 to 30V/μm, the alignment degree of the quantum rod 106 is maximum, and the long axes of the quantum rod 106 and the liquid crystal molecule 107 are arranged along the electric field line direction (the first transverse direction), so that the polarization direction of the polarized light emitted by the quantum rod 106 is parallel to the absorption axis direction P1 of the polarizer 110 (or perpendicular to the transmission axis direction P2 of the polarizer 110), the light cannot transmit the polarizer 110, and the display structure 100 is in the darkest state. In this embodiment, in order to make the brightness of the entire display structure 100 uniform, it is necessary to control the electric field intensities in the plurality of electrode devices 103 to be the same.
Here, the number and distribution positions of the quantum rods 106 and the liquid crystal molecules 107 are not limited by the present embodiment, which is intended to show the distribution direction thereof, so that different distribution positions of the quantum rods 106 and the liquid crystal molecules 107 are respectively illustrated in the three electrode devices 103.
As shown in fig. 1, when the electric field strength is 0, the quantum rods 106 and the liquid crystal molecules 107 are randomly distributed in the electrode device 103, and at this time, more light passes through the polarizer 110, and the display structure 100 is in the brightest state. Thus, continuous adjustment of brightness can be achieved by varying the strength of the electric field, since the quantum rods 106 are driven by the electric field with different degrees of polarization, i.e., different degrees of alignment, the greater the degree of polarization, the darker the display structure 100.
In addition, the display structure 100 can be used not only as a light source with adjustable brightness, but also as a display pixel. Specifically, each electrode device 103 may correspond to one pixel region, and the size of the quantum rod 106 in one electrode device 103 is the same so that the emission wavelength thereof is the same. Full-color display is realized by injecting quantum rods 106 of different light emission wavelengths into the electrode device 103 to obtain three colors of red, green and blue. For example, in a red (R) pixel region, the corresponding quantum rod 106 below it may emit light of a red wavelength; in a green (G) pixel region, the corresponding quantum rod 106 below it can emit light of a green wavelength; in the blue pixel region, the corresponding quantum rod 106 below it may emit light of a blue wavelength.
It is to be noted that the wavelength of the fluorescence emitted from the quantum rod 106 varies depending on the size of the quantum rod 106. Specifically, as the size of the quantum rod 106 increases, fluorescence having a longer wavelength is emitted, so that the size of the quantum rod 106 emitting red light is the largest, the size of the quantum rod 106 emitting green light is medium, and the size of the quantum rod 106 emitting blue light is the smallest.
In this embodiment, as shown in fig. 1, the display structure 100 may further include a light source stopping film 111 located between the second substrate 102 and the polarizer 110, which can filter the excitation light to avoid the influence of the excitation light. For example, if the bottom light source provides blue light, the light source cut-off film 111 may be a filter capable of filtering out the blue light, so that the colors of the R and G pixel regions are not affected by the blue light, and the color saturation is better. Meanwhile, the light source is cut to the film 111, which does not affect the color of the B pixel region, because the quantum rod 106 of the B pixel region can emit blue light.
Referring to fig. 4, fig. 4 is a schematic cross-sectional view illustrating a display structure in a brightest state according to another embodiment of the present invention, where the display structure 100 further includes an alignment film 112 disposed on the first substrate 101, an alignment direction of the alignment film 112 is a second transverse direction, i.e., parallel to a transmission axis direction P2 of the polarizer 110, when no voltage is applied, the quantum rods 106 are aligned along the alignment direction (the second transverse direction), i.e., perpendicular to a plane, and a polarization direction of polarized light emitted by the quantum rods 106 is parallel to the transmission axis direction P2 of the polarizer 110, so that light passes through the polarizer 110, and brightness of the display structure 100 in the absence of voltage can be improved.
The display structure provided by the embodiment of the invention comprises: the liquid crystal display device comprises a first substrate 101, a second substrate 102 located above the first substrate 101 and parallel to the first substrate 101, a plurality of electrode devices 103 located between the first substrate 101 and the second substrate 102 and adjacently arranged along a first transverse direction parallel to the first substrate 101, wherein each electrode device 103 is configured to generate an electric field with a specific direction, a mixed solution of quantum rods 106 and liquid crystal molecules 107 sealed in each electrode device 103, the quantum rods 106 in the mixed solution are deflected in response to the electric fields generated by the electrode devices 103, and the polarization degree of the quantum rods 106 is different under different electric field strengths. By controlling the magnitude of the electric field intensity in the electrode device 103, polarized light with different degrees of polarization can be prepared through the quantum rod 106 without a lower polarizer in the conventional technology, and the quantum rod device is simple in structure, high in energy utilization rate and high in luminous efficiency.
An embodiment of the present invention further provides a display device including the display structure 100, and the display device further includes a backlight unit for providing backlight to the display structure 100. It can be understood that the display device can have the same technical effects as the display structure, and the description is omitted here.
The above description of the embodiments is only for helping understanding the technical solution of the present invention and its core idea; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A display structure, comprising:
a first substrate;
a second substrate positioned above the first substrate and parallel to the first substrate;
a plurality of electrode devices positioned between the first and second substrates and adjacently arranged in a first lateral direction parallel to the first substrate, each of the electrode devices configured to generate an electric field in a specific direction;
and a mixed solution of quantum rods and liquid crystal molecules sealed in each of the electrode devices, the quantum rods in the mixed solution being deflected in response to an electric field generated by the electrode devices.
2. The display structure according to claim 1, wherein each of the electrode devices comprises first and second electrodes arranged at intervals along the first lateral direction, the first and second electrodes being arranged between the first and second substrates along a first longitudinal direction perpendicular to the first substrate, the electrode devices being configured to generate an electric field parallel to the first lateral direction.
3. The display structure of claim 1, further comprising a polarizer on the second substrate, wherein a transmission axis direction of the polarizer is aligned with a second transverse direction parallel to the first substrate and perpendicular to the first transverse direction.
4. The display structure according to claim 3, wherein the emission wavelengths of the quantum rods in the same electrode device are the same, each electrode device corresponds to one pixel region, and the emission wavelengths of the quantum rods in the electrode devices corresponding to pixel regions of different colors are different, wherein the emission wavelength of the quantum rod corresponding to a red pixel region is a red wavelength, the emission wavelength of the quantum rod corresponding to a green pixel region is a green wavelength, and the emission wavelength of the quantum rod corresponding to a blue pixel region is a blue wavelength.
5. The display structure of claim 3, further comprising a light source cut-off film between the second substrate and the polarizer.
6. The display structure of claim 1, wherein the materials of the quantum rod comprise a luminescent core and an inorganic protective shell, a high stability composite quantum rod, and a perovskite quantum rod.
7. The display structure of claim 1, further comprising an alignment film on the first substrate, wherein the alignment direction of the alignment film is the second lateral direction.
8. The display structure of claim 2, wherein the first and second electrodes are spaced between 3 and 100 μm apart, and wherein the quantum rod has an aspect ratio of 3: 1 to 15: 1, the radial diameter of the quantum rod is between 2 and 10 nm.
9. The display structure according to claim 8, further comprising a controller which controls whether or not to apply a voltage to the electrode device, wherein when the controller applies a voltage to the electrode device and the degree of polarization of the quantum rod is maximized, a desired electric field frequency is 1 to 30KHz, an electric field intensity is 20 to 30V/μm, and the quantum rod and the liquid crystal molecules are aligned in the first transverse direction; when the controller does not apply a voltage to the electrode device and the polarization degree of the quantum rod is 0, the quantum rod and the liquid crystal molecules are randomly oriented.
10. A display device comprising the display structure of any one of claims 1 to 9 and a backlight unit located below the display structure for providing backlight to the display structure.
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| CN111290160B (en) | 2023-05-30 |
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