CN111158195B - Display device and preparation method and driving method thereof - Google Patents
Display device and preparation method and driving method thereof Download PDFInfo
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- CN111158195B CN111158195B CN202010002443.XA CN202010002443A CN111158195B CN 111158195 B CN111158195 B CN 111158195B CN 202010002443 A CN202010002443 A CN 202010002443A CN 111158195 B CN111158195 B CN 111158195B
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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
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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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
Abstract
The invention discloses a display device, a manufacturing method thereof and a driving method thereof. The display device comprises inversion particles arranged between a first electrode and a second electrode, the inversion particles comprise a light emitter and an outer layer structure wrapping the light emitter, the outer layer structure comprises a liquid crystal modulation part, and the liquid crystal modulation part is configured to adjust the transmittance of light under the action of an electric field between the first electrode and the second electrode. The driving method comprises the steps of applying voltage to the first electrode and the second electrode, and driving the inversion particles to turn over so that the liquid crystal modulation part faces to a display side; and applying a voltage to the first electrode and the second electrode to adjust the light transmittance of the liquid crystal modulation part, wherein the light emitted by the light emitter is emitted to a display side through the liquid crystal modulation part. The display device and the driving method can realize the display of the display panel under the condition of no ambient light, and realize the day and night universality of the electronic paper.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device and a preparation method and a driving method thereof.
Background
Electronic Paper (E-Paper for short) is an ultrathin and ultralight display screen, which is a general name of a technology, the display effect of the Electronic Paper is close to the effect of natural Paper, the reading fatigue can be avoided, and the Electronic Paper has the characteristics of comfortable reading like Paper, ultrathin, light weight, flexibility and ultralow power consumption. At present, the approaches for implementing the electronic paper technology mainly include electrophoretic display (EPD), inverted ball (Gyricon) technology, cholesteric liquid crystal display (lcd) technology, and micro-cup technology. The electronic paper has the working principle that colored small particles with static electricity are placed in two layers of transparent films (usually films), the particles have two colors and respectively have different positive and negative charges, and the positive and negative electrodes are additionally arranged outside the films, so that the small particles move and are arranged into characters or patterns according to the principle of homopolar repulsion and heteropolar attraction.
The electronic paper has many advantages, for example, (1) the reading state is good, the eyes will not feel tired even if the user gazes for a long time, the light sensation can be adjusted on the surface, the processing contrast is high, and the reflectivity is 6 times of that of the liquid crystal; (2) the contrast is 2 times that of liquid crystal and 2 times that of newspaper. The electronic paper reflects ambient light to display, is more suitable for outdoor viewing compared with an LCD (liquid crystal display), has low power consumption, has a bistable characteristic, keeps pictures when power is off, and only consumes power when a screen is refreshed; (3) the electronic paper can realize flexible display, can be bent and folded, and has good flexibility; (4) the wide visual angle, because of the microsphere structure, the reflecting surface is wide, and the visual angle can reach 180 degrees; (5) high resolution, light weight, and no need for backlight. The electronic paper has the greatest advantage of good visual effect in sunlight. However, the conventional electronic paper display technology adopts reflective display, and the display cannot work in a state without ambient light, such as at night. The reason for this is that, in a state without ambient light, for example, at night, there is no ambient light, and the electronic paper display cannot reflect the ambient light for imaging.
Disclosure of Invention
An embodiment of the invention provides a display device, a manufacturing method thereof and a driving method thereof, and aims to solve the problem that an electronic paper display device cannot work at night.
In order to solve the above technical problem, an embodiment of the present invention provides a display device, including a first substrate and a second substrate that are oppositely disposed, and inversion particles disposed between the first substrate and the second substrate, wherein a first electrode is disposed on a side of the first substrate facing the inversion particles, a second electrode is disposed on a side of the second substrate facing the inversion particles, the inversion particles include a light emitter and an outer structure wrapping the light emitter, the outer structure includes a liquid crystal modulation portion, and the liquid crystal modulation portion is configured to adjust transmittance of light under an electric field between the first electrode and the second electrode.
Optionally, the outer layer structure further includes a colored portion, the colored portion is disposed opposite to the liquid crystal modulation portion, the liquid crystal modulation portion has a first electrical property, and the colored portion has a second electrical property opposite to the first electrical property.
Optionally, the liquid crystal modulator includes white dichroic dye liquid crystal particles having a first electrical property.
Optionally, the liquid crystal modulation part further includes a transparent colloid, and the dichroic dye liquid crystal particles are doped in the transparent colloid.
Optionally, the luminophor comprises a barrier film and luminescent particles wrapped by the barrier film.
Optionally, the luminescent particles comprise quantum dot luminescent particles.
Optionally, the light emitter further comprises a colloid wrapped by the barrier film, and the luminescent particles are doped in the colloid.
Optionally, the display device includes a plurality of pixel units, each pixel unit includes three inversion particles, and light emitters of the three inversion particles emit red light, green light, and blue light, respectively.
In order to solve the above technical problem, an embodiment of the present invention further provides a method for manufacturing a display device, where the method includes:
preparing a first substrate, a second substrate and reversal particles, wherein a first electrode is arranged on one side of the first substrate, a second electrode is arranged on one side of the second substrate, the reversal particles comprise a luminous body and an outer layer structure wrapping the luminous body, the outer layer structure comprises a liquid crystal modulation part and a colored part which are oppositely arranged, the liquid crystal modulation part has a first electrical property, and the colored part has a second electrical property opposite to the first electrical property;
the inversion particles are disposed between the first substrate and the second substrate, the first electrode faces the inversion particles, the second electrode faces the inversion particles, and the liquid crystal modulator is configured to adjust transmittance of light under an electric field between the first electrode and the second electrode.
Optionally, preparing the inverted particles comprises:
preparing a luminophor and an outer layer structure, wherein the luminophor comprises colloid, luminescent particles doped in the colloid and a barrier film wrapping the colloid, the outer layer structure comprises a liquid crystal modulation part and a colored part which are oppositely arranged, the liquid crystal modulation part has a first electric property, and the colored part has a second electric property opposite to the first electric property;
forming the outer layer structure on an outer surface of the light emitter.
Optionally, preparing an outer layer structure comprising:
doping a transparent colloid with colored particles and dichroic dye liquid crystal particles, wherein the dichroic dye liquid crystal particles have a first electric property, and the colored particles have a second electric property opposite to the first electric property;
and arranging the transparent colloid in the pipeline, applying an electric field to the pipeline, and distributing the colored particles and the dichroic dye liquid crystal particles on two opposite sides of the pipeline to form a colored part and a liquid crystal modulation part under the action of the electric field.
Optionally, forming the outer layer structure on an outer surface of the light emitter comprises:
passing the light through the conduit;
when the luminous body passes through the end part of the pipeline, the colored part and the liquid crystal modulation part are coated on the two opposite sides of the luminous body.
In order to solve the above technical problem, an embodiment of the present invention further provides a method for driving a display device, where the display device includes a first substrate and a second substrate that are disposed opposite to each other, and inversion particles disposed between the first substrate and the second substrate, a first electrode is disposed on a side of the first substrate facing the inversion particles, a second electrode is disposed on a side of the second substrate facing the inversion particles, the inversion particles include a light emitter and an outer structure that wraps the light emitter, the outer structure includes a liquid crystal modulation portion and a colored portion that are disposed opposite to each other, the liquid crystal modulation portion has a first electric property, the colored portion has a second electric property opposite to the first electric property, and the liquid crystal modulation portion is configured to adjust transmittance of light under an electric field between the first electrode and the second electrode, the driving method includes:
applying a voltage to the first electrode and the second electrode to drive the inversion particles to turn over so that the liquid crystal modulation part faces a display side;
and applying a voltage to the first electrode and the second electrode to adjust the light transmittance of the liquid crystal modulation part, wherein the light emitted by the light emitter is emitted to a display side through the liquid crystal modulation part.
According to the display device provided by the embodiment of the invention, the transmittance of the liquid crystal modulation part can be adjusted by applying corresponding voltages to the first electrode and the second electrode, so that light emitted by the luminous body can transmit through the liquid crystal modulation part to realize display of the display device, and different transmittances of the liquid crystal modulation part can be realized by controlling the voltage difference between the first electrode and the second electrode, so that different gray scale color display of the display device is realized. When the transmittance of the liquid crystal modulator is 0, the display device does not display any more. According to the display device provided by the embodiment of the invention, the light emitted by the luminous body penetrates through the liquid crystal modulation part to realize display, the display of the display device is not limited by ambient light any more, and the day and night universality of the display device is realized. When the display device is applied to the electronic paper, the electronic paper display technology which is universal day and night can be provided.
The driving method of the display device of the embodiment of the invention can realize black-and-white display in the ambient light state, such as daytime, does not need to drive liquid crystal particles to deflect and transmit light, and reduces the power consumption of the display device; under the condition of no ambient light, for example, at night, color display with different gray scales can be realized. When the technical scheme of the embodiment of the invention is applied to the electronic paper, the day and night universality of the electronic paper can be realized, and the color display of different gray scales of the electronic paper can be realized without being limited by ambient light.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic cross-sectional view of a display device in a dark state according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the display device shown in FIG. 1 in a bright state without ambient light;
FIG. 3 is a schematic diagram of a structure of an inverted particle;
FIG. 4a is a schematic diagram of a reflective state of liquid crystal particles;
FIG. 4b is a schematic diagram of the emissive state of the liquid crystal particles;
FIG. 5 is a schematic cross-sectional view of a display device in a bright state under ambient light according to an embodiment of the present invention;
FIG. 6 is a display state of the display device in an ambient light state;
FIG. 7 is a display state of the display device in a no ambient light state;
FIG. 8 is a simplified schematic illustration of a method of making a display device according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a process for producing inverted particles according to an embodiment;
fig. 10 is a schematic diagram of a driving method of a display device in an embodiment of the present invention.
Description of the reference numerals:
10 — a first substrate; 11 — a first electrode; 20 — a second substrate;
21 — a second electrode; 40-inverting the particle; 41-outer layer structure;
411 — colored portion; 412-liquid crystal modulation section; 414-liquid crystal particles;
42-a light emitter; 421-luminescent particles; 422-barrier film;
423-colloid.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The technical contents of the present invention will be described in detail through specific embodiments.
Fig. 1 is a schematic cross-sectional structure diagram of a display device in a dark state according to an embodiment of the present invention, fig. 2 is a schematic cross-sectional structure diagram of the display device in fig. 1 in a bright state without ambient light, and fig. 3 is a schematic structural diagram of an inverted particle. As shown in fig. 1, 2 and 3, the display device according to the embodiment of the present invention includes a first substrate 10 and a second substrate 20 disposed opposite to each other, and inversion particles 40 disposed between the first substrate 10 and the second substrate 20. The first substrate 10 is provided with a first electrode 11 on a side facing the inverse particles 40 and the second substrate 20 is provided with a second electrode 21 on a side facing the inverse particles 40. As shown in fig. 3, the inverse particle 40 includes a luminophore 42 and an outer structure 41 enclosing the luminophore 42. The outer layer structure 41 includes a liquid crystal modulation portion 412, and the liquid crystal modulation portion 412 is configured to adjust the transmittance of light under the action of an electric field between the first electrode 11 and the second electrode 21. Typically, the first electrode is a pixel electrode and the second electrode is a common electrode.
According to the display device of the embodiment of the invention, the transmittance of the liquid crystal modulation part 412 can be adjusted by applying corresponding voltages to the first electrode 11 and the second electrode 21, so that light emitted by the light emitter 42 can transmit through the liquid crystal modulation part 412 to realize display of the display device, and different transmittances of the liquid crystal modulation part 412 can be realized by controlling the voltage difference between the first electrode 11 and the second electrode 21, so that different gray scale color displays of the display device can be realized. When the transmittance of the liquid crystal modulator 412 is 0, the display device does not display any more. According to the display device provided by the embodiment of the invention, the light emitted by the luminous body penetrates through the liquid crystal modulation part to realize display, the display of the display device is not limited by ambient light any more, and the day and night universality of the display device is realized. When the display device is applied to the electronic paper, the electronic paper display technology which is universal day and night can be provided.
In an exemplary embodiment, as shown in fig. 3, the outer layer 41 further includes a colored portion 411, the colored portion 411 is disposed opposite to the liquid crystal modulation portion 412, the liquid crystal modulation portion 412 has a first electrical property, and the colored portion 411 has a second electrical property opposite to the first electrical property. When the display device displays, the inversion particles are inverted by applying corresponding voltages to the first electrode and the second electrode, so that the liquid crystal modulation part 412 can face the display side, and the colored part 411 can be separated from the display side, and the voltages of the first electrode and the second electrode can be controlled to realize the display of the display device; when the display device does not need to display, by applying corresponding voltages to the first electrode and the second electrode, the inversion particles are turned over, the colored portion 411 can be made to face the display side, the liquid crystal modulation portion 412 is made to depart from the display side, the display side of the display device presents the color of the colored portion 411, and when the colored portion 411 is set to be black, the dark state of the display device is realized. In one exemplary embodiment, the liquid crystal modulating part 412 includes liquid crystal particles 414, and the liquid crystal particles 414 may include dichroic dye liquid crystal particles having a first electrical property. To avoid the color of the liquid crystal particles from affecting the display, in one exemplary embodiment, the liquid crystal particles 414 may be white dichroic dye liquid crystal particles. The dichroic dye liquid crystal particles may be a mixture of dichroic dye molecules and liquid crystal molecules, and may be prepared by a doping or polymer method.
In one exemplary embodiment, the color of the colored part 411 may be black. Under the state of ambient light, corresponding voltages are applied to the first electrode and the second electrode, so that the voltage difference between the first electrode and the second electrode is in a first voltage difference range, the inversion particles are driven to invert, and the light rays incident from the display side can be reflected back to the display side by the inversion particles, so that black and white display of the display panel is realized. The voltage difference between the first electrode and the second electrode is an absolute value of a difference between the first electrode voltage and the second electrode voltage. The inversion particles may be driven to invert when the voltage difference between the first electrode and the second electrode is in a first voltage difference range. That is, the first voltage difference range is a voltage difference range in which inversion of the particles can be driven. In one exemplary embodiment, the first voltage difference range is 45V to 55V, and in one exemplary embodiment, the first voltage difference may be 50V.
FIG. 4a is a schematic diagram of a reflective state of the liquid crystal particles, and FIG. 4b is a schematic diagram of an emissive state of the liquid crystal particles. The liquid crystal particles 414 have two operational states, namely a reflective state and an emissive state. When the liquid crystal particles are in a reflective state, as shown in fig. 4a, the liquid crystal particles 414 are arranged in a lateral direction, that is, the long axis direction of the liquid crystal particles 414 is parallel to the direction of the second electrode 21, light rays emitted from the upper side to the liquid crystal particles 414 are reflected by the liquid crystal particles 414 and then emitted from the upper side, and the light rays cannot pass through the liquid crystal particles 414, so that the display device appears white.
When corresponding voltages are applied to the first electrode 11 and the second electrode 21, so that the voltage difference between the first electrode 11 and the second electrode 21 reaches the second voltage difference range, the liquid crystal particles 414 are deflected under the action of the electric field. In fig. 4b, the liquid crystal particles 414 are deflected to the vertical state (i.e. the direction of the long axis of the liquid crystal particles 414 is perpendicular to the direction of the second electrode 21). When the liquid crystal particles 414 are deflected, the lower light passes through the liquid crystal particles 414 and is emitted from the upper side, thereby realizing a bright state. By controlling the voltage difference between the first electrode 11 and the second electrode 21, the deflection angle of the liquid crystal particles 414 can be controlled, and gray scale display can be achieved. That is, when the liquid crystal particles 414 are in a reflective state, the liquid crystal particles 414 may reflect light, but light may not pass through the liquid crystal particles 414; when the liquid crystal particles 414 are in an emissive state, light may pass through the liquid crystal particles 414.
The voltage difference between the first electrode and the second electrode is the absolute value of the difference between the first electrode voltage and the second electrode voltage, and when the voltage difference between the first electrode and the second electrode is in the second voltage difference range, the liquid crystal particles 414 can be driven to deflect, but the inversion particles cannot be driven to turn. That is, the second voltage difference range is a voltage difference range in which the liquid crystal particles can be driven to deflect. In one exemplary embodiment, the second voltage difference ranges from 4V to 6V, and in one exemplary embodiment, the second voltage difference may be 5V.
In the display device of the embodiment of the invention, in the state without ambient light, by controlling the relative electrical property of the first electrode and the second electrode and controlling the voltage difference between the first electrode and the second electrode to be in the first voltage difference range, the inversion particles can be turned over, so that the liquid crystal modulation part 412 faces the display side, and the colored part 411 deviates from the display side. By controlling the voltages of the first electrode and the second electrode, the voltage difference between the first electrode and the second electrode is within the second voltage difference range, and the liquid crystal particles 414 can be driven to deflect to adjust the light transmittance of the liquid crystal modulation portion 412, so that the light emitted by the light emitter is transmitted through the liquid crystal modulation portion 412, thereby realizing the display of the display device. In the ambient light state, by controlling the relative electric properties of the first electrode and the second electrode and controlling the voltage difference between the first electrode and the second electrode to be within the first voltage difference range, the inversion particles can be inverted, the liquid crystal particles keep a reflective state, ambient light is reflected, light emitted by the light-emitting body cannot be emitted through the liquid crystal modulation part 412, and the display device realizes black-and-white display.
In one exemplary embodiment, the color of the colored portion 411 is black, the colored portion 411 is positively charged (i.e., the second electrical property is positive), and the liquid crystal particles 414 are negatively charged (i.e., the first electrical property is negative). The display device comprises a plurality of pixel cells, each pixel cell comprising three inversion particles 40, the emitters of the three inversion particles emitting red, green and blue light, respectively.
As shown in fig. 1, in a state without ambient light, for example, at night, by applying corresponding voltages to the first electrode 11 and the second electrode 21, the first electrode 11 is made to be positive, the second electrode 21 is made to be negative, and the voltage difference between the first electrode and the second electrode is controlled to be within the first voltage difference range, under the action of the electric field, the inverse particles 40 are inverted, the colored portion 411 faces the second substrate 20 (i.e., the display side), the liquid crystal modulation portion 412 faces the first substrate 10, and the display device is made to be in a dark state (black state). In an exemplary embodiment, the electronic paper display panel may control the inversion of the inversion particles 40 by applying a pulse voltage to the first electrode 11 and the second electrode 21. That is, after the inversion particles 40 are inverted, the voltages on the first electrode 11 and the second electrode 21 are removed, and the liquid crystal particles 414 remain in the reflective state. The light emitted from the light emitter 42 will not pass through the liquid crystal modulation part 412, and the light leakage of the display device is avoided.
As shown in fig. 2, in a state without ambient light, for example, at night, by applying corresponding voltages to the first electrode 11 and the second electrode 21, the first electrode 11 is made to exhibit negative polarity, the second electrode 21 is made to exhibit positive polarity, and the voltage difference between the first electrode and the second electrode is controlled to be within the first voltage difference range, so that the inverse particles 40 are inverted under the action of the electric field, the colored portion 411 faces the first substrate 10, and the liquid crystal modulation portion 412 faces the second substrate 20 (i.e., the display side). In an exemplary embodiment, the electronic paper display panel may control the inversion of the inversion particles 40 by applying a pulse voltage to the first electrode 11 and the second electrode 21. That is, when the inversion particles 40 are inverted, the voltages on the first electrode 11 and the second electrode 21 are removed. The voltages of the first electrode 11 and the second electrode 21 are controlled such that the voltage difference between the first electrode 11 and the second electrode 21 is in the second voltage difference range, and the liquid crystal particles 414 are deflected under the action of the second voltage difference, so that the light emitted by the light emitter 42 can be emitted to the display side through the liquid crystal modulation portion 412, thereby implementing the color display of the display device. By adjusting the voltage corresponding to the inverse particles within the first voltage difference range, the deflection angle of the liquid crystal particles 414 can be adjusted, thereby achieving color display of different gray scales of the display device.
In the ambient light state, for example, during the day, the dark state cross-sectional structure of the display device is shown in fig. 1. The colored portion 411 faces the second substrate 20 (i.e., the display side), and the colored portion 411 can absorb ambient light to make the display device take a dark state (black state).
FIG. 5 is a schematic cross-sectional view of a display device in a bright state under ambient light according to an embodiment of the present invention. By applying corresponding voltages to the first electrode 11 and the second electrode 21, respectively, the first electrode 11 is made to exhibit electronegativity, the second electrode 21 is made to exhibit electropositivity, and the voltage difference between the first electrode and the second electrode is controlled to be within the first voltage difference range, the inverse particles 40 are inverted under the action of the electric field, the colored portion 411 faces the first substrate 10, and the liquid crystal modulation portion 412 faces the second substrate 20 (i.e., the display side). When the inversion particles are inverted, the voltage on the first electrode and the second electrode is removed, the liquid crystal particles 414 remain in the reflective state, and the light emitted from the light emitter 42 does not pass through the liquid crystal modulation portion 412. The light of the external environment light is irradiated from the display side onto the liquid crystal modulation portion 421, is reflected or scattered by the liquid crystal particles 414, and is emitted to the display side, and the display device is in a bright state. In one embodiment, the liquid crystal particles 414 are white liquid crystal particles, such that, in the state shown in FIG. 5, the display device assumes a white state. By controlling the voltages of the first electrode 11 and the second electrode 21 corresponding to the inverted particles, black and white display of the display device can be realized.
In the electronic paper display device of the reverse particle mode, the voltage for driving the reverse particles to reverse is a pulse voltage, and after the reverse particles reverse, the voltage is removed, so that the display device can keep an image state. When the image needs to be changed, the inversion particles are driven to turn over by applying pulse voltage to the inversion particles again.
The display device of the embodiment of the invention realizes black-and-white display in the ambient light state, such as daytime, and realizes color display with different gray scales in the non-ambient light state, such as night. When the technical scheme of the embodiment of the invention is applied to the electronic paper, the day and night universality of the electronic paper can be realized, and the color display of different gray scales of the electronic paper can also be realized.
Fig. 6 shows a display state of the display device in an ambient light state, and fig. 7 shows a display state of the display device in a non-ambient light state. In the ambient light state, the display device displays black and white, as shown in fig. 6, and in the non-ambient light state, the display device displays color, as shown in fig. 7.
In the ambient light state, the colored portion may be set to black and the liquid crystal particles may be set to white in order to realize black-and-white display of the display device. It is to be understood that the colored portion may be provided in a color of red, blue, green, or the like, so that, in an ambient light state, red-white display, blue-white display, green-white display, or the like can be realized.
In one exemplary embodiment, the inverse particles 40 are spherical particles, such as spherical, ellipsoidal, or the like. The outer diameter of the spherical inverse particle 40 may be determined according to practice and is not particularly limited thereto. When the inverse particle 40 is a spherical particle, the colored portion 411 may be one hemisphere, and the liquid crystal modulation portion 412 may be the other hemisphere opposite to the one hemisphere. The inversion particles 40 are spherical particles, so that the friction and collision of the inversion particles 40 during the inversion can be reduced, and the response speed and the service life of the display device can be improved. In addition, the spherical inversion particles also form a spherical surface on the outer surface of the liquid crystal modulation part 412, and when the light emitted from the light emitter passes through the liquid crystal modulation part 412, the outgoing range of the light can be enlarged, thereby increasing the viewing angle of the display device. It is to be understood that the inverse particles may be cube-shaped particles or particles having other shapes, and the effects of the embodiments of the present invention can be achieved as long as the colored portion and the liquid crystal modulation portion are disposed opposite to each other.
In an exemplary embodiment, the colored portion 411 may include a transparent colloid and colored particles (e.g., black particles) with a second conductivity doped in the transparent colloid, and the transparent colloid forms the colored portion after being cured. The liquid crystal modulator 412 may include a transparent gel and first-conductivity white dichroic dye liquid crystal particles doped in the transparent gel, and the outer surface of the liquid crystal modulator 412 is cured to form a film, and the inside of the liquid crystal modulator 412 is still in a gel state, so that the liquid crystal particles may be deflected in the liquid crystal modulator 412.
It is readily understood that the first electrical property may be a positive electrical property and the second electrical property may be a negative electrical property; alternatively, the first electrical property is a negative electrical property, and the second electrical property is a positive electrical property, so that the technical effects of the embodiments of the present invention can be achieved.
In one exemplary embodiment, the luminophor 42 comprises a barrier film 422 and luminescent particles 421 surrounded by the barrier film 422.
In one exemplary embodiment, the luminescent particles may comprise quantum dot luminescent particles. The quantum dot light-emitting particles are self-luminous particles and can emit light rays by themselves. The quantum dot light-emitting particles have high light-emitting purity and can realize high-color gamut display.
In an exemplary embodiment, as shown in fig. 3, the light emitter 42 further includes a colloid 423 surrounded by the barrier film 422, and a plurality of light emitting particles are doped in the colloid 423. The colloid 423 can keep the stability of the luminescent particles 421, so that the light emitted by the luminescent body is more uniform, and the uniform display of the display device is ensured.
In order to keep the liquid crystal particles in a reflective state when the liquid crystal particles are not deflected to block the light of the light emitter, an alignment layer may be disposed on the outer surface of the liquid crystal modulator 412, so that the liquid crystal particles can keep a reflective state when the liquid crystal particles are not deflected to block the light of the light emitting particles and display the reflection of the light.
An embodiment of the present invention further provides a method for manufacturing a display device, as shown in fig. 8, where fig. 8 is a schematic diagram of a method for manufacturing a display device according to an embodiment of the present invention, the method includes:
preparing a first substrate, a second substrate and reversal particles, wherein a first electrode 11 is arranged on one side of the first substrate 10, a second electrode 21 is arranged on one side of the second substrate 20, and the reversal particles comprise a luminous body 42 and an outer layer structure 41 wrapping the luminous body 42. The outer layer structure 41 includes a colored portion 411 and a liquid crystal modulating portion 412 which are oppositely disposed. The liquid crystal modulation part 412 has a first electrical property, and the colored part 411 has a second electrical property opposite to the first electrical property;
the inversion particles 40 are disposed between the first substrate 10 and the second substrate 20, the first electrode 11 faces the inversion particles, the second electrode 21 faces the inversion particles 40, and the liquid crystal modulator 412 is configured to adjust transmittance of light by an electric field between the first electrode 11 and the second electrode 21.
FIG. 9 is a schematic diagram of a process for producing the reversal particles in one example. In one exemplary embodiment, preparing the inverse particles, as shown in fig. 9, may include:
preparing a luminophor and an outer layer structure, wherein the luminophor comprises colloid 423, luminescent particles 421 doped in the colloid 423 and a barrier film 422 wrapping the colloid 423 and the luminescent particles 421, the outer layer structure comprises a liquid crystal modulation part and a colored part which are oppositely arranged, the liquid crystal modulation part has a first electric property, and the colored part has a second electric property opposite to the first electric property;
an outer layer structure is formed on an outer surface of the luminous body.
In one exemplary embodiment, preparing the outer layer structure may include:
doping colored particles and liquid crystal particles in a transparent colloid, wherein the liquid crystal particles have a first electric property, and the colored particles have a second electric property opposite to the first electric property;
the transparent colloid is arranged in the pipeline, an electric field is applied to the pipeline, and under the action of the electric field, the colored particles and the liquid crystal particles are distributed on two opposite sides of the pipeline to form a colored part and a liquid crystal modulation part. In one exemplary embodiment, the colored particles and the liquid crystal particles are distributed along the inner sidewall of the duct on opposite sides of the duct.
In one exemplary embodiment, the liquid crystal particles may be white dichroic dye liquid crystal particles.
In one exemplary embodiment, forming the outer layer structure on an outer surface of the light emitter includes:
passing the light through the conduit;
when the luminous body passes through the end part of the pipeline, the colored part and the liquid crystal modulation part are coated on the two opposite sides of the luminous body.
When the luminous body passes through the pipeline, the pipe diameter of the pipeline is gradually reduced at the tiny end part of the pipeline, when the luminous body flows through the end part of the pipeline, the outer layer structure is coated on the surface of the luminous body, and the colored part and the liquid crystal modulation part are oppositely arranged on the outer surface of the luminous body.
In an exemplary embodiment, the outer layer structure is formed on an outer surface of the light emitter, further comprising:
and curing the colored part and the liquid crystal modulation part by adopting a heating method, wherein a cured film is formed on the outer surface of the liquid crystal modulation part, and the inside of the liquid crystal modulation part is of a colloid structure so that the dichroic dye liquid crystal particles can deflect under the action of an electric field.
The inversion particles are cured by adopting a heating mode, the colored part is cured into a solid state by controlling the heating process parameters, the outer surface of the liquid crystal modulation part is cured into a film, but the inside of the liquid crystal modulation part keeps a colloid state, so that the liquid crystal particles can be deflected in the liquid crystal modulation part. This method is conventional in the art and will not be described further herein.
In one exemplary embodiment, preparing the light emitter may include:
providing colloid 423, and doping luminescent particles 421 in the colloid 423;
a barrier film 422 is deposited on the outer surface of the colloid 423 doped with the luminescent particles 421. The technique of depositing a barrier film on the outer surface of the colloid is conventional in the art.
The colloid 423 may be a transparent colloid, and the colloid 423 may maintain stability of the light emitting particle 421.
An embodiment of the present invention further provides a driving method of the display device, as shown in fig. 10, where fig. 10 is a schematic diagram of the driving method of the display device in the embodiment of the present invention, the driving method includes:
applying 21 a voltage to the first electrode 11 and the second electrode to drive the inversion particles 40 to invert so that the liquid crystal modulation part faces the display side;
a voltage is applied to the first electrode 11 and the second electrode 21 to adjust the light transmittance of the liquid crystal modulator, and the light emitted from the light emitter is emitted to the display side through the liquid crystal modulator.
In one exemplary embodiment, when the inversion particles 40 are driven to flip, the voltage difference between the first electrode 11 and the second electrode 21 is in a first voltage difference range, and the first voltage difference range is 45V to 55V.
In one exemplary embodiment, the voltage that drives the inversion of the inversion particles 40 is a pulsed voltage.
In one exemplary embodiment, when the light transmittance of the liquid crystal modulation part is adjusted, the voltage difference between the first electrode 11 and the second electrode 21 is in a second voltage difference range, and the second voltage difference range is 4V to 6V.
The voltage difference between the first electrode and the second electrode is an absolute value of a difference between a voltage of the first electrode and a voltage of the second electrode.
In one exemplary embodiment, the driving method may further include:
in an ambient light state, a voltage is applied to the first electrode 11 and the second electrode 21, so that a voltage difference between the first electrode 11 and the second electrode 21 is in a first voltage difference range, the liquid crystal modulation portion 412 faces a display side or the colored portion faces the display side, and the display device displays a colored portion color or white to realize display.
The driving method of the display device of the embodiment of the invention can realize black and white display in the ambient light state, such as daytime, does not need to drive liquid crystal particles to deflect and transmit light, and reduces the power consumption of the display device; under the condition of no ambient light, for example, at night, color display with different gray scales can be realized. When the technical scheme of the embodiment of the invention is applied to the electronic paper, the electronic paper can be used in the day and night, and the color display of different gray scales of the electronic paper can be realized without being limited by ambient light.
It is easily understood that the display device according to the embodiment of the present invention may be an electronic paper display device, such as an electronic book, an electronic tag, a billboard, or any other product or component having a display function.
In the description of the embodiments of the present invention, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. A display device is characterized by comprising a first substrate, a second substrate and reversal particles, wherein the first substrate and the second substrate are oppositely arranged, the reversal particles are arranged between the first substrate and the second substrate, a first electrode is arranged on one side, facing the reversal particles, of the first substrate, a second electrode is arranged on one side, facing the reversal particles, of the second substrate, the reversal particles comprise a light emitter and an outer layer structure wrapping the light emitter, the outer layer structure comprises a liquid crystal modulation part, and the liquid crystal modulation part is configured to adjust the transmittance of light under the action of an electric field between the first electrode and the second electrode; the outer layer structure further comprises a colored part, the colored part and the liquid crystal modulation part are arranged oppositely, the liquid crystal modulation part has a first electric property, and the colored part has a second electric property opposite to the first electric property.
2. The display device according to claim 1, wherein the liquid crystal modulator portion includes dichroic dye liquid crystal particles of a white color, the dichroic dye liquid crystal particles having a first electric property.
3. The display device according to claim 2, wherein the liquid crystal modulator further comprises a transparent colloid, and the dichroic dye liquid crystal particles are doped in the transparent colloid.
4. The display device according to claim 1, wherein the light-emitting body comprises a barrier film and light-emitting particles wrapped by the barrier film.
5. A display device as claimed in claim 4, characterised in that the luminescent particles comprise quantum dot luminescent particles.
6. The display device according to claim 4, wherein the light-emitting body further comprises a colloid surrounded by the barrier film, and the light-emitting particles are doped in the colloid.
7. A display device as claimed in any one of claims 1 to 6, comprising a plurality of pixel cells, each pixel cell comprising three of said inverse particles, the emitters of the three inverse particles emitting red, green and blue light respectively.
8. A method of manufacturing a display device, the method comprising:
preparing a first substrate, a second substrate and reversal particles, wherein a first electrode is arranged on one side of the first substrate, a second electrode is arranged on one side of the second substrate, the reversal particles comprise a luminous body and an outer layer structure wrapping the luminous body, the outer layer structure comprises a liquid crystal modulation part and a colored part which are oppositely arranged, the liquid crystal modulation part has a first electrical property, and the colored part has a second electrical property opposite to the first electrical property;
the inversion particles are disposed between the first substrate and the second substrate, the first electrode faces the inversion particles, the second electrode faces the inversion particles, and the liquid crystal modulator is configured to adjust transmittance of light by an electric field between the first electrode and the second electrode.
9. The method of claim 8, wherein preparing the inverse particles comprises:
preparing a luminophor and an outer layer structure, wherein the luminophor comprises colloid, luminescent particles doped in the colloid and a barrier film wrapping the colloid;
forming the outer layer structure on an outer surface of the light emitter.
10. The method of claim 9, wherein preparing an outer layer structure comprises:
doping a transparent colloid with colored particles and dichroic dye liquid crystal particles, wherein the dichroic dye liquid crystal particles have a first electrical property, and the colored particles have a second electrical property opposite to the first electrical property;
and arranging the transparent colloid in the pipeline, applying an electric field to the pipeline, and distributing the colored particles and the dichroic dye liquid crystal particles on two opposite sides of the pipeline to form a colored part and a liquid crystal modulation part under the action of the electric field.
11. A manufacturing method according to claim 10, wherein forming the outer layer structure on an outer surface of the light-emitting body comprises:
passing the light through the conduit;
when the luminous body passes through the end part of the pipeline, the colored part and the liquid crystal modulation part are coated on the two opposite sides of the luminous body.
12. A driving method of a display device, the display device including a first substrate and a second substrate disposed opposite to each other, and inversion particles disposed between the first substrate and the second substrate, a first electrode disposed on a side of the first substrate facing the inversion particles, a second electrode disposed on a side of the second substrate facing the inversion particles, the inversion particles including a light emitter and an outer structure wrapping the light emitter, the outer structure including a liquid crystal modulation portion and a colored portion disposed opposite to each other, the liquid crystal modulation portion having a first electric property, the colored portion having a second electric property opposite to the first electric property, the liquid crystal modulation portion being configured to adjust transmittance of light under an electric field between the first electrode and the second electrode, the driving method comprising:
applying a voltage to the first electrode and the second electrode to drive the inversion particles to turn over so that the liquid crystal modulation part faces a display side;
and applying a voltage to the first electrode and the second electrode to adjust the light transmittance of the liquid crystal modulation part, wherein the light emitted by the light emitter is emitted to a display side through the liquid crystal modulation part.
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