CN113156732A - Reflective display panel, preparation method thereof and display device - Google Patents
Reflective display panel, preparation method thereof and display device Download PDFInfo
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- CN113156732A CN113156732A CN202110604842.8A CN202110604842A CN113156732A CN 113156732 A CN113156732 A CN 113156732A CN 202110604842 A CN202110604842 A CN 202110604842A CN 113156732 A CN113156732 A CN 113156732A
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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
- G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
- G02F1/1675—Constructional details
- G02F1/1677—Structural association of cells with optical devices, e.g. reflectors or illuminating devices
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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
- G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
Abstract
The embodiment of the disclosure provides a reflective display panel, a preparation method thereof and a display device. The reflective display panel includes: the ink-jet printing device comprises a first substrate, a second substrate and an ink structure layer, wherein the first substrate and the second substrate are oppositely arranged, and the ink structure layer is positioned between the first substrate and the second substrate; the ink structure layer includes: an ink including black microparticles; further comprising: the first reflecting structure is positioned on one side of the first substrate close to the second substrate and is configured to reflect a part of light rays incident to the first reflecting structure to a direction close to the first substrate; the second reflecting structure is positioned on one side of the second substrate close to the first substrate and is configured to reflect the other part of the light beam which exits from the first reflecting structure to the second reflecting structure to the direction close to the first substrate.
Description
Technical Field
The embodiment of the disclosure relates to but is not limited to the technical field of display, and in particular relates to a reflective display panel, a preparation method thereof and a display device.
Background
At present, display devices can be classified into three types, i.e., transmissive, reflective, and transflective, according to the type of light source (including backlight or ambient light) used in the display device. The reflective display device reflects ambient light incident into the reflective display device to realize display. Because the reflective display device does not need to be additionally provided with a backlight module to provide backlight for the display of the reflective display device, the reflective display device is widely concerned and applied. However, some reflective display devices in the art have problems of low reflectivity and poor display effect when displaying in a bright state.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
In a first aspect, an embodiment of the present disclosure provides a reflective display panel, including: the ink-jet printing device comprises a first substrate, a second substrate and an ink structure layer, wherein the first substrate and the second substrate are oppositely arranged, and the ink structure layer is positioned between the first substrate and the second substrate; the ink structure layer includes: an ink including black microparticles;
further comprising: the first reflecting structure is positioned on one side of the first substrate close to the second substrate and is configured to reflect a part of light rays incident to the first reflecting structure to a direction close to the first substrate; the second reflecting structure is positioned on one side of the second substrate close to the first substrate and is configured to reflect the other part of the light beam which exits from the first reflecting structure to the second reflecting structure to the direction close to the first substrate.
In a second aspect, an embodiment of the present disclosure provides a display device, including: the reflective display panel described in the above embodiments.
In a third aspect, an embodiment of the present disclosure provides a method for manufacturing a reflective display panel, where the reflective display panel is the reflective display panel described in the foregoing embodiment, and the method includes:
providing a first substrate and a second substrate;
forming a first reflective structure on the first substrate;
forming a second reflective structure on the second substrate;
and filling ink containing black particles between the first substrate and the second substrate to form an ink structure layer.
In a fourth aspect, an embodiment of the present disclosure provides a method for manufacturing a reflective display panel, where the reflective display panel is the reflective display panel described in the foregoing embodiment, and the method includes:
providing a first substrate and a second substrate;
forming a first reflection structure and the retaining wall structure on the first substrate, and forming a second reflection structure on the second substrate, or forming a first reflection structure on the first substrate, and forming a second reflection structure and the retaining wall structure on the second substrate;
and filling ink containing black particles between the first substrate and the second substrate to form an ink structure layer.
The reflective display panel, the manufacturing method thereof, and the display device provided in the embodiments of the present disclosure may include: the ink jet printing device comprises a first substrate, a second substrate, an ink structure layer, a first reflection structure and a second reflection structure, wherein the first substrate and the second substrate are arranged oppositely, the ink structure layer is positioned between the first substrate and the second substrate, and the first reflection structure and the second reflection structure are arranged oppositely; and the second reflecting structure is positioned on one side of the second substrate close to the first substrate and is configured to reflect the other part of light beams emitted from the first reflecting structure to the second reflecting structure to the direction close to the first substrate. Therefore, the reflective display panel provided by the exemplary embodiment of the present disclosure can reflect and utilize the light leak of the first reflective structure again by preparing the second reflective structure on the second substrate, so that the bright-state reflectivity of the reflective display panel can be improved, the contrast and the bright-state brightness of the reflective display panel can be improved, and the display quality of the reflective display panel can be improved.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the disclosure. Other advantages of the disclosure may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Other aspects will be apparent upon reading and understanding the attached drawings and detailed description.
Drawings
The accompanying drawings are included to provide an understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure. The shapes and sizes of the various elements in the drawings are not to be considered as true proportions, but are merely intended to illustrate the present disclosure.
FIG. 1A is a schematic diagram of a reflective display device in a bright state;
FIG. 1B is a schematic diagram of a reflective display device in a dark state;
FIG. 1C is a schematic diagram of another reflective display device;
FIG. 1D is a schematic diagram of another reflective display device in a bright state;
FIG. 1E is a schematic diagram of another reflective display device in a dark state;
FIG. 1F is a schematic view of a first light leakage of another reflective display device in a bright state;
FIG. 1G is a second light leakage diagram of another reflective display device in bright state display;
FIG. 2 is a schematic structural diagram of a reflective display panel in an exemplary embodiment of the disclosure;
FIG. 3 is a schematic structural diagram of a reflective display panel in an exemplary embodiment of the disclosure in a bright state;
FIG. 4 is a schematic view of a retaining wall structure in an exemplary embodiment of the present disclosure;
FIG. 5A is a schematic view of a second reflective structure in an exemplary embodiment of the present disclosure;
FIG. 5B is another schematic view of a second reflective structure in an exemplary embodiment of the present disclosure;
FIG. 5C is yet another schematic view of a second reflective structure in an exemplary embodiment of the present disclosure;
fig. 6 is a schematic diagram illustrating a first reflective structure and a dam structure formed on a first substrate in an exemplary embodiment of the disclosure;
fig. 7 is a schematic view after a second reflective structure is formed on a second substrate in an exemplary embodiment of the disclosure;
fig. 8 is a schematic view after a first reflective structure is formed on a first substrate in an exemplary embodiment of the present disclosure;
fig. 9 is a schematic diagram illustrating a second reflective structure and a dam structure formed on a second substrate in an exemplary embodiment of the disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the embodiments may be implemented in a plurality of different forms. Those skilled in the art can readily appreciate the fact that the forms and details may be varied into a variety of forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the contents described in the following embodiments. The embodiments and features of the embodiments in the present disclosure may be arbitrarily combined with each other without conflict.
In the drawings, the size of each component, the thickness of layers, or regions may be exaggerated for clarity. Therefore, one aspect of the present disclosure is not necessarily limited to the dimensions, and the shapes and sizes of the respective components in the drawings do not reflect a true scale. Further, the drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes, numerical values, and the like shown in the drawings.
The ordinal numbers such as "first", "second", "third", and the like in the present specification are provided for avoiding confusion among the constituent elements, and are not limited in number.
In this specification, for convenience, words such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating orientations or positional relationships are used to explain positional relationships of constituent elements with reference to the drawings, only for convenience of description and simplification of description, and 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 disclosure. The positional relationship of the components is changed as appropriate in accordance with the direction in which each component is described. Therefore, the words described in the specification are not limited to the words described in the specification, and may be replaced as appropriate.
In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited. For example, it may be a fixed connection, or a removable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.
The reflective display device is a device structure which utilizes natural environment light to display, can realize clear display by utilizing the environment light under strong light or weak light, and has the advantages of small driving voltage, energy conservation and small damage to eyes. Current reflective display devices may include: an electronic Ink (E-Ink) reflective display device and a Clear-Ink (cid) reflective display device.
The working principle of the E-Ink reflective display device is as follows: when voltage is applied to an electrode in the reflective display device, white particles in ink move to the surface of a dielectric layer on the display side, black particles in ink move to the side opposite to the display side, and light is reflected to realize bright-state display; when a voltage is applied to the electrodes in the reflective display, the white particles in the ink move to the side opposite to the display side, and the black particles in the ink move to the surface of the dielectric layer on the display side, so that the light is directly absorbed to realize dark state display.
Fig. 1A is a schematic structural view of a reflective display device in a bright state display, and fig. 1B is a schematic structural view of a reflective display device in a dark state display. As shown in fig. 1A and 1B, the reflective display device may include: a first substrate 111 and a second substrate 121 disposed opposite to each other, a first electrode 112 disposed on a side of the first substrate 111 close to the second substrate 121, a second electrode 122 disposed on a side of the second substrate 121 close to the first substrate 111, and a microcapsule 13 disposed between the first electrode 112 and the second electrode 122, the microcapsule 13 may include: ink 14 includes white microparticles 141 (also referred to as white ink particles or white microsphere particles) and black microparticles 142 (also referred to as black ink particles or black microsphere particles), wherein the black microparticles 142 and the white microparticles 141 carry different charges. For example, when the first electrode 112 and the second electrode 122 are not energized, the black particles 142 are negatively charged, the white particles 141 are positively charged, and the entire microcapsule 13 is electrically balanced. For example, as shown in fig. 1A, when a positive voltage is applied to the first electrode 112, the black particles 142 approach the first electrode 112, the white particles 141 are distributed above the microcapsule 13, and the ambient light incident from the second substrate 121 is reflected at the white particles 141 in the microcapsule 13, so that the display device can display a bright state. For example, as shown in fig. 1B, when the first electrode 112 is applied with a negative voltage, the white particles 141 approach the first electrode 112, the black particles 142 are distributed above the microcapsules 13, and the ambient light incident from the second substrate 121 is absorbed at the black particles 142 in the microcapsules 13, so that the display device can display a dark state.
The working principle of another CID reflective display device is as follows: when voltage is applied to an electrode in the reflective display device, black particles in the ink move to the side opposite to the display side, and bright state display is realized by utilizing total reflection realized by the high refractive index of the dielectric layer and the low refractive index of the electronic ink; when a voltage is applied to an electrode in a reflective display device, black particles in ink move to the surface of a dielectric layer on the display side, so that light is directly absorbed to realize dark state display.
Fig. 1C is a schematic structural diagram of another reflective display device, fig. 1D is a schematic structural diagram of another reflective display device in a bright state display, and fig. 1E is a schematic structural diagram of another reflective display device in a dark state display. In fig. 1D and 1E, one lens is illustrated as an example.
For example, as shown in fig. 1C, the reflective display may include: the liquid crystal display device includes a first substrate 21 and a second substrate 22 which are arranged oppositely, a filter layer 29 arranged on a side of the first substrate 21 close to the second substrate 22, a transparent lens 28 arranged on a side of the filter layer 29 close to the second substrate 22, a first electrode 23 arranged on a side of the lens 28 close to the second substrate 22, a first dielectric layer 24 arranged on a side of the first electrode 23 close to the second substrate 22, a second electrode 25 arranged on a side of the second substrate 22 close to the first substrate 21, a second dielectric layer 26 arranged on a side of the second electrode 25 close to the first substrate 21, ink 20 (including black particles) filled between the first substrate 21 and the second substrate 22, and a retaining wall structure 27 arranged between the first substrate 21 and the second substrate 22. The black particles in the ink 20 have two main characteristics: (1) sensitive to voltage or electric field, and can move rapidly under the electric field or voltage; (2) the black particles themselves have light absorbing ability. For example, as shown in fig. 1C and 1D, when the first electrode 23 applies a black particle repelling voltage and the second electrode 25 applies a black particle attracting voltage, the black particles migrate away from the first substrate 21, and since the refractive index of the first dielectric layer 24 is greater than the refractive index of the ink 20, at least the light incident from the first substrate 21 of the reflective display can be totally reflected at the interface between the first dielectric layer 24 and the ink 20, and the reflected light is absorbed and recognized by the eyes of the user, so that the bright state display of the reflective display can be realized. For example, as shown in fig. 1C and fig. 1E, when the first electrode 23 applies an attraction voltage of black particles and the second electrode 25 applies a repulsion voltage of black particles, the black particles in the ink 20 migrate toward the first substrate 21, the black particles in the ink 20 are adsorbed onto the surface of the first dielectric layer 24, and since the refractive index of the first dielectric layer 24 is smaller than that of the black particles, the total reflection condition on the surface of the first dielectric layer 24 is destroyed, so that at least the light incident from the first substrate 21 of the reflective display is directly absorbed by the black particles in the ink 20 after escaping from the first dielectric layer 24, although the light can pass through the first dielectric layer 24 at the interface between the first dielectric layer 24 and the ink 20, and at this time, no reflected light escapes, and a dark state display is presented.
The CID reflective display device has advantages of low driving voltage, low power consumption, and color display realization as compared to the E-ink reflective display device, but the inventors of the present disclosure have studied and found that: on the other hand, as shown in fig. 1F, when the arc top of the first dielectric layer 24 is vertically incident by external ambient light, since the incident light incidence angle is smaller than the total reflection angle of the interface between the first dielectric layer 24 and the ink 20, the light cannot be totally reflected at the interface between the first dielectric layer 24 and the ink 20, and the light "leaks" from the interface and enters the ink 20, and is absorbed by the black particles, so that the overall reflectivity of the external light is reduced, and the contrast and the brightness of the reflective display panel are reduced, resulting in the reduction of the display quality of the reflective display panel. On the other hand, as shown in fig. 1G, the first dielectric layer 24 is generally manufactured by a process method of imprinting and thermal reflow, due to process limitations, the top curvature of the first dielectric layer 24 is most difficult to control during the manufacturing process, and when the top curvature of the first dielectric layer 24 is smaller than a pre-designed value during the manufacturing process, the ratio of "light leakage" is further increased, which results in a further decrease in the bright-state reflectivity of the CID reflective display device. Therefore, when the CID reflective display device is in a bright state, there is a problem that a part of ambient incident light is not totally reflected at the interface between the first dielectric layer 24 and the ink 20, so that the CID reflective display device has a low reflectivity when the CID reflective display device is in a bright state, and the contrast and the bright state brightness of the reflective display panel are reduced, thereby reducing the display quality of the reflective display panel.
At least one exemplary embodiment of the present disclosure provides a reflective display panel. The reflective display panel may include: the ink structure layer comprises a first substrate, a second substrate and an ink structure layer, wherein the first substrate and the second substrate are oppositely arranged, and the ink structure layer is positioned between the first substrate and the second substrate; the ink structure layer includes: an ink including black microparticles; the reflective display panel may further include: the first reflecting structure is positioned on one side of the first substrate close to the second substrate and is configured to reflect a part of light rays incident to the first reflecting structure to a direction close to the first substrate; and the second reflecting structure is positioned on one side of the second substrate close to the first substrate and is configured to reflect the other part of light beams emitted from the first reflecting structure to the second reflecting structure to the direction close to the first substrate.
Therefore, the reflective display panel provided by the exemplary embodiment of the present disclosure can reflect and utilize the light leak of the first reflective structure prepared on the first substrate again through the second reflective structure prepared on the second substrate, so that the bright-state reflectivity of the reflective display panel can be improved, the contrast and the bright-state brightness of the reflective display panel can be improved, and the display quality of the reflective display panel can be improved.
For example, fig. 2 is a schematic structural diagram of a reflective display panel in an exemplary embodiment of the present disclosure, and fig. 3 is a schematic structural diagram of a reflective display panel in an exemplary embodiment of the present disclosure in a bright state. Here, in fig. 3, the first reflective structure includes: one lens is taken as an example and is illustrated by one reflective column in the second reflective structure. In fig. 3, the solid line with arrows indicates incident light and light leaking from the first reflecting structure, the dotted line with arrows indicates primary reflected light reflected by the first reflecting structure, and the dotted line with arrows indicates secondary reflected light reflected by the second reflecting structure.
As shown in fig. 2 and 3, the reflective display panel may include: the ink-jet printing device comprises a first substrate 21, a second substrate 22 and an ink structure layer, wherein the first substrate 21 and the second substrate 22 are arranged oppositely, and the ink structure layer is positioned between the first substrate 21 and the second substrate 22; the ink structure layer may include: an ink 20 containing black microparticles; the reflective display panel may further include: the first reflection structure 30 and the second reflection structure 31 are oppositely arranged, wherein the first reflection structure 30 is positioned on one side of the first substrate 21 close to the second substrate 22 and is configured to reflect a part of light rays incident to the first reflection structure 30 to a direction close to the first substrate 21; the second reflective structure 31 is located on a side of the second substrate 22 close to the first substrate 21, and configured to reflect another part of the light beams emitted from the first reflective structure 30 to the second reflective structure 31 toward the first substrate 21.
In an exemplary embodiment, as shown in fig. 2, the reflective display panel may further include: and a retaining wall structure 27 disposed between the first substrate 21 and the second substrate 22. As shown in fig. 4, the retaining wall structure 27 may include: a plurality of pixel opening regions 271, and opaque regions 272 disposed between adjacent pixel opening regions 271.
In one exemplary embodiment, the retaining wall structure may be prepared by nanoimprinting.
In an exemplary embodiment, as shown in fig. 2, the reflective display panel may further include: filter layer 29, filter layer 29 may include: a plurality of color filters 291 and a light-shielding layer 292 disposed between adjacent color filters 291, wherein the light-shielding layer 292 corresponds to the opaque region 272, and the plurality of color filters 291 may correspond to the plurality of pixel opening regions 271. Thus, when the reflective display panel displays, the color corresponding to the color of the color filter can be displayed at the position corresponding to the pixel opening regions, and the color display of the reflective display panel can be realized.
In an exemplary embodiment, the light shielding layer may be a Black Matrix (BM) layer configured to prevent crosstalk between adjacent pixels and to shield light irradiated on the thin film transistor. For example, as shown in fig. 3, regions other than the pixel opening region are covered with the black matrix.
In an exemplary embodiment, the height of the retaining wall structure and the height of the second reflective structure in a plane perpendicular to the reflective display panel satisfy the following relation:
wherein H represents the height of the dam structure, and H represents the height of the second reflective structure. Wherein, the height of the dam structure and the height of the second reflective structure may refer to a maximum height in a direction perpendicular to the first substrate. Here, when the h height is small, the path of the light emitted from the first reflective structure 30 to reach the second reflective structure 31 is long, the rate of absorption of the light emitted from the first reflective structure 30 by the black microspheres is increased, and the secondary reflection efficiency is low; when the height h is larger, the distance from the reflective pillar to the first reflective structure 30 is smaller, which affects the speed and effect of the black micro-particles attached to the first reflective structure 30. Therefore, the height of the retaining wall structure and the height of the second reflecting structure meet the relational expression, so that the reflecting efficiency can be better improved, and better adhesion speed and adhesion effect are ensured.
In an exemplary embodiment, in order to prevent the first electrode and the second electrode from being conducted, the material of the bank structure may be an insulating material, such as polyimide, resin (e.g., any one of acrylic resin and epoxy resin), or silicon dioxide. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, as shown in fig. 2, a surface of the first reflective structure 30 close to the second substrate 22 is a first curved surface protruding toward a direction close to the second substrate 22, and the first curved surface is a portion of a spherical surface. For example, the first curved surface may be a part of any one of a spherical surface and an ellipsoidal surface.
In an exemplary embodiment, a surface of the second reflective structure 31 adjacent to the first substrate 21 is any one of a flat surface and a second curved surface, and the second curved surface is any one of a portion of a spherical surface, a portion of a conical surface, and an uneven surface. For example, as shown in fig. 2, a surface of the second reflective structure 31 close to the first substrate 21 may be a concave arc surface; alternatively, as shown in fig. 5A, a surface of the second reflective structure 31 close to the first substrate 21 may be a flat reflective surface, or, as shown in fig. 5B, a surface of the second reflective structure 31 close to the first substrate 21 may be a sawtooth reflective surface, or, as shown in fig. 5C, a surface of the second reflective structure 31 close to the first substrate 21 may be a convex arc surface. Here, fig. 5A to 5B only illustrate the shape of the reflective columns in the second reflective structure, and do not illustrate the reflective film provided on the curved surfaces of the reflective columns.
In an exemplary embodiment, a cross-sectional shape of the first curved structure may be a portion of any one of a circle and an ellipse, and a cross-sectional shape of the curved structure of the second reflective structure is a portion of any one of a circle, an ellipse, and a triangle, in a plane perpendicular to the reflective display panel.
In one exemplary embodiment, the second reflective structure may be fabricated by nanoimprinting.
In an exemplary embodiment, the second reflective structure and the barrier structure may be prepared by a one-time patterning process.
In an exemplary embodiment, as shown in fig. 2, when the first curved surface of the first reflective structure 30 and the second curved surface of the second reflective structure 31 are both spherical surfacesWhen the first curved surface is located on the spherical surface, the diameter of the spherical surface where the first curved surface is located and the diameter of the spherical surface where the second curved surface is located can satisfy the following relational expression:
wherein D represents the diameter of the spherical surface where the first curved surface is located, and D represents the diameter of the spherical surface where the second curved surface is located. The existence of the reflective column can generate certain blocking influence on the diffusion of black particles in the ink to a certain extent, and the smaller the diameter of the reflective column is, the better the diameter of the reflective column is, and the maximum diameter of the reflective column is not more than the aperture 1/2 of the lens on the premise of ensuring that the secondary reflection is performed on the light leakage at the top of the arc of the first reflective structure 30. Thus, the diameter of the spherical surface on which the second curved surface of the second reflecting structure 31 is arranged is not more than 1/2 times of the diameter of the spherical surface on which the first curved surface of the first reflecting structure 30 is arranged, so that better secondary reflection can be ensured, and the diffusion barrier to the black particles can be ensured to be smaller.
In an exemplary embodiment, as shown in fig. 2, the first reflective structure 30 may include: the liquid crystal display device comprises a plurality of lenses 28 arranged in an array and a first dielectric layer 24 positioned on one side of the lenses 28 far away from a first substrate 21, wherein the refractive index of the first dielectric layer 24 is greater than that of the ink 20, and the refractive index of the first dielectric layer 24 is less than that of the black particles.
In an exemplary embodiment, as shown in fig. 2, the first reflective structure 30 may further include: a first electrode 23 located between the plurality of lenses 28 and the first dielectric layer 24.
In an exemplary embodiment, as shown in fig. 2, the second reflective structure 31 may include: at least one reflective post 311 corresponding to at least one of the plurality of lenses 28, and a reflective film 312 positioned at a side of the at least one reflective post 311 adjacent to the first substrate 21, wherein a refractive index of the reflective film 312 may be less than a refractive index of the ink 20.
In an exemplary embodiment, the material of the at least one reflective pillar may be any one of acrylic resin and epoxy resin. For example, when the material of at least one reflection column is acrylic resin, the nano-imprinting filling effect is better due to low viscosity, so that the completeness of the curved surface appearance of at least one reflection column is good. For example, when the material of the at least one reflective column is epoxy resin, the cured curved surface of the at least one reflective column can have high mechanical strength due to the high viscosity of the epoxy resin.
In one exemplary embodiment, the reflective film may have a single layer structure or a multi-layer structure, and for example, the reflective film may have a single layer structure of a material having high reflectivity, such as an Ag (silver) film, a white reflective material film, white oil, or the like. For example, the reflective film may be a multilayer structure of high-reflectivity materials such as ITO/Ag/ITO. Thus, the light incident on the reflecting film can be reflected, and a high-brightness light emitting effect can be obtained.
In an exemplary embodiment, the total number of the reflective columns may be less than the total number of the lenses in at least one pixel opening area.
In an exemplary embodiment, the number of the reflective columns in the pixel opening regions corresponding to the color filters of the same color in the plurality of color filters is the same, and/or the number of the reflective columns in the pixel opening regions corresponding to the color filters of at least two different colors in the plurality of color filters is different. Therefore, the number of the reflecting columns in the pixel opening area corresponding to each sub-pixel can be adjusted according to the display effect. For example, after the reflective display panel is manufactured, if the entire display color is green, the number of reflective columns in the pixel opening area corresponding to the green sub-pixel can be reduced to reduce the luminance of the green sub-pixel when the reflective columns are prepared, so as to optimally adjust the chromaticity of the image of the reflective display panel. Furthermore, according to the method, the number of the reflecting columns in the pixel opening area corresponding to the sub-pixels with different colors can be designed in a targeted manner according to the feedback display effect of the device, so that the adjustment and optimization of the display effect of the reflective display panel are realized.
In an exemplary embodiment, as shown in fig. 2, the lens 28 may be a transparent material, so that the light transmittance of the reflective display device is higher. For example, as shown in fig. 2, a transparent lens 28 may be disposed between the first electrode 23 and the first substrate 21, and a surface of the lens 28 adjacent to the second substrate 22 may be a curved surface. For example, the curved surface may be prepared by a nano-imprinting process or a photolithography process. For example, as shown in fig. 2, a surface of the lens 28 close to the second substrate 22 may be a curved surface convex toward the direction close to the second substrate 22. For example, the curved surface may be a portion of a spherical surface (e.g., a sphere or an ellipsoid). For example, the curved surface may be a hemispherical curved surface. Of course, the curved surface of the lens 28 may have other shapes, and may be set according to the thickness requirement of the reflective display device (e.g. the distance between the light incident surface of the first substrate 21 and the reflective surface of the first dielectric layer 24). Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, the material of the lens 28 may be a transparent inorganic material or organic material, and the refractive index of the inorganic material or organic material forming the transparent dielectric layer 204 is 1.5 to 2.0, for example, the refractive index of the lens 28 may be 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0. For example, the organic material forming the lens 28 may include at least one of polystyrene and acrylic, the inorganic material forming the lens 28 may include at least one of silicon dioxide, silicon oxynitride, and silicon nitride, and the lens 28 may be formed of a titanium dioxide material. Of course, other materials may be used as long as they have a refractive index of 1.5 to 2.0, a transparent characteristic, and a certain hardness, for example, a material having a refractive index equal to or substantially equal to that of the first dielectric layer 24. Here, the embodiment of the present disclosure does not limit this. As shown in fig. 3, the refractive index of the lens 28 and the refractive index of the first electrode 23 may be the same or substantially the same as the refractive index of the first dielectric layer 24, so that when light incident from the first substrate 21 side passes through the lens 28 and then passes through the first electrode 23 and the first dielectric layer 24, the propagation direction of the light is substantially unchanged, and since the refractive index of the first dielectric layer 24 may be greater than the refractive index of the ink 20, the incident light may be totally reflected at the interface of the first dielectric layer 24 and the ink 20.
In an exemplary embodiment, the thickness of the lens may be 10 μm (micrometers) to 20 μm, such as 10 μm, 15 μm, or 20 μm. Here, the thickness of the lens is a maximum thickness in a direction perpendicular to the first substrate.
In an exemplary embodiment, as shown in fig. 2, the reflective display panel may further include: the second electrode 25 on the side of the first substrate 21 close to the second substrate and the second dielectric layer 26 on the side of the second electrode 25 close to the second substrate are displaced.
In an exemplary embodiment, the first electrode 23 may be disposed on a side of the lens 28 close to the second substrate 22, or may be disposed on a side of the first substrate 21 far from the second substrate 22. For example, as shown in fig. 2, by disposing the first electrode 23 on the side of the lens 28 away from the first substrate 21, i.e., on the side close to the second electrode 25, power consumption when a voltage is applied to the first electrode 23 and the second electrode 25 to form an electric field can be reduced. In the following description, the first electrode 23 is disposed on the side of the lens 28 away from the first substrate 21.
In one exemplary embodiment, the first electrode may be one of a common electrode and a pixel electrode, and the second electrode may be the other one of the common electrode and the pixel electrode. The pixel electrode is connected to a driving circuit in the array substrate, and a data voltage is applied thereto. Different data voltages enable the voltage difference between the first electrode and the second electrode to be different, so that the migration speed of the black particles to the direction far away from the first substrate is different, and different display gray scales are achieved.
In one exemplary embodiment, the first electrode and the second electrode may include: one or more of a monolithic electrode and a plurality of bulk electrodes. For example, the first electrode and the second electrode may be both monolithic electrodes, and thus, when a voltage is applied to the first electrode and the second electrode, accurate control of light is achieved through accurate control of the black particles.
In one exemplary embodiment, the first electrode and the second electrode may be transparent electrodes made of the same material. For example, the transparent electrode may be made of a transparent conductive Oxide material such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and the like. For example, the first electrode and the second electrode may be formed using an ITO material, and thus, the light transmittance of the reflective display device may be made higher.
In one exemplary embodiment, the first substrate may be an opposite substrate, and the second substrate may be an array substrate. For example, the counter substrate may be a Color Filter (CF) substrate. For example, the array substrate may include pixel driving circuits arranged in an array, each pixel driving circuit for driving one pixel, for example, to control a voltage difference between the first electrode and the second electrode in the corresponding pixel, thereby implementing display. When light is incident from the first substrate of the reflective display device, the first substrate is a transparent substrate, such as a glass substrate, so that the light transmittance of the reflective display device can be higher. For example, the material of the second substrate may include resin. For example, the material of the second substrate may be one of Polydimethylsiloxane (PEMS), polyethylene terephthalate (PET), and Polyimide (PI).
In one exemplary embodiment, when the luminance of ambient light is large, the light incident from the first substrate side of the reflective display device may be ambient light, and at this time, the ambient light functions as a light source for display; when the brightness of the ambient light is low, a light emitting element may be additionally disposed on the first substrate, and the light incident from the front surface of the reflective display may be light emitted from the light emitting element.
The disclosed embodiment also provides a display device, which may include: the reflective display panel in one or more of the above embodiments.
In an exemplary embodiment, the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer or a navigator, etc. Here, the embodiment of the present disclosure does not limit the type of the display device. Other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present disclosure.
In addition, the display device in the embodiment of the present disclosure may include other necessary components and structures besides the above structure, for example, a pixel driving circuit, and the like, and those skilled in the art may design and supplement the display device accordingly according to the type of the display panel, and details thereof are not repeated herein.
The technical solution of the embodiment of the present disclosure is explained below by an example of a manufacturing process of a display panel. The "patterning process" in the embodiments of the present disclosure includes processes of depositing a film, coating a photoresist, mask exposure, developing, etching, and stripping a photoresist, and is a well-known and well-established manufacturing process. The deposition may be performed by known processes such as sputtering, evaporation, chemical vapor deposition, etc., the coating may be performed by known coating processes, and the etching may be performed by known methods, which are not limited herein. In the description of the embodiments of the present disclosure, a "thin film" refers to a layer of a material that is deposited or coated on a substrate. The "thin film" may also be referred to as a "layer" if it does not require a patterning process or a photolithography process throughout the fabrication process. If a patterning process or a photolithography process is required for the "thin film" in the entire manufacturing process, the "thin film" is referred to as a "thin film" before the patterning process, and the "layer" after the patterning process. The "layer" after the patterning process or the photolithography process includes at least one "pattern". The "a and B are disposed in the same layer" in the present disclosure means that a and B are simultaneously formed by the same patterning process.
At least one embodiment of the present disclosure further provides a method for manufacturing a reflective display panel. The preparation method comprises the following steps:
step 11: a first substrate and a second substrate are provided.
For example, the first substrate and the second substrate may be an opposite substrate and an array substrate, respectively, and the opposite substrate may be a color filter substrate, for example. When light is incident on the reflective display panel, the first substrate is a transparent substrate, such as a glass substrate.
Step 12: a first reflective structure is formed on a first substrate.
Step 13: a second reflective structure is formed on the second substrate.
In an exemplary embodiment, step 13 may include: step 131: and preparing the second reflecting structure by adopting a nano-imprinting method.
In an exemplary embodiment, step 131 may include: coating nanoimprint glue on the second substrate; adopting a nano-imprinting method to imprint and form a reflecting column with a reflecting groove; and preparing a reflecting film in the reflecting groove.
In one exemplary embodiment, the reflective film may have a single-layer structure or a multi-layer structure, and for example, the reflective film may have a single-layer structure of a material having high reflectivity such as an Ag (silver) film. For example, the reflective film may be a multilayer structure of high-reflectivity materials such as ITO/Ag/ITO. Thus, the light incident on the reflecting film can be reflected, and a high-brightness light emitting effect can be obtained.
In an exemplary embodiment, the shape of the top end of the embossed reflective pillar includes, but is not limited to, a concave arc surface, or may be a convex arc surface, a sawtooth reflective surface, a flat reflective surface, and the like.
In an exemplary embodiment, the nanoimprint glue may be selected from any one of an acrylic resin and an epoxy resin. For example, the acrylic resin with low viscosity has good nano-imprinting filling effect, and the micro-morphology completeness of the curved surface structure of the second reflecting structure is good. For example, epoxy resins have high viscosity and high mechanical strength after curing.
Step 14: and filling ink containing black particles between the first substrate and the second substrate to form an ink structural layer.
In an exemplary embodiment, taking the first reflective structure and the retaining wall structure as an example, the preparation method may include steps 21 to 24:
step 21: a first substrate and a second substrate are provided.
Step 22: as shown in fig. 6, a first reflective structure 30 and a bank structure 27 are formed on the first substrate.
Step 23: as shown in fig. 7, a second reflective structure 31 is formed on the second substrate.
Step 24: as shown in fig. 2, for the first substrate and the second substrate of the cartridge, ink including black microparticles is filled between the first substrate and the second substrate to form an ink structure layer.
In an exemplary embodiment, taking the second reflective structure and the retaining wall structure as an example, the preparation method may include steps 31 to 34:
step 31: a first substrate and a second substrate are provided.
Step 32: as shown in fig. 8, a first reflective structure 30 is formed on a first substrate.
Step 33: as shown in fig. 9, a second reflective structure 31 and a dam structure 27 are formed on the second substrate.
In an exemplary embodiment, step 33 may comprise: and preparing a second reflecting structure and a retaining wall structure by adopting a nano-imprinting method. Therefore, the secondary reflection structure and the retaining wall are simultaneously prepared in a nano-imprinting mode, so that the problems of low contrast ratio and low brightness of a CID device can be solved, and the process difficulty cannot be increased.
Step 34: as shown in fig. 2, for the first substrate and the second substrate of the cartridge, ink including black microparticles is filled between the first substrate and the second substrate to form an ink structure layer.
For technical details that are not disclosed in the embodiments of the preparation method of the present disclosure, those skilled in the art should refer to the description in the embodiments of the display panel of the present disclosure for understanding, and therefore, the description is omitted here.
Although the embodiments disclosed in the present disclosure are described above, the above description is only for the convenience of understanding the present disclosure, and is not intended to limit the present disclosure. It will be understood by those skilled in the art of the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure, and that the scope of the disclosure is to be limited only by the terms of the appended claims.
Claims (15)
1. A reflective display panel, comprising: the ink-jet printing device comprises a first substrate, a second substrate and an ink structure layer, wherein the first substrate and the second substrate are oppositely arranged, and the ink structure layer is positioned between the first substrate and the second substrate; the ink structure layer includes: an ink including black microparticles;
further comprising: the first reflecting structure is positioned on one side of the first substrate close to the second substrate and is configured to reflect a part of light rays incident to the first reflecting structure to a direction close to the first substrate; the second reflecting structure is positioned on one side of the second substrate close to the first substrate and is configured to reflect the other part of the light beam which exits from the first reflecting structure to the second reflecting structure to the direction close to the first substrate.
2. The reflective display panel of claim 1, wherein the first reflective structure comprises: the ink comprises a plurality of lenses arranged in an array and a first dielectric layer located on one side, far away from the first substrate, of the lenses, wherein the refractive index of the first dielectric layer is larger than that of the ink, and the refractive index of the first dielectric layer is smaller than that of the black particles.
3. The reflective display panel of claim 2, wherein the second reflective structure comprises: at least one reflective column corresponding to at least one of the plurality of lenses, and a reflective film on a side of the at least one reflective column near the first substrate, wherein a refractive index of the reflective film is less than a refractive index of the ink.
4. The reflective display panel according to any one of claims 1 to 3, wherein a surface of the first reflective structure adjacent to the second substrate is a first curved surface protruding toward a direction adjacent to the first substrate, and the first curved surface is a portion of a spherical surface.
5. The reflective display panel according to claim 4, wherein a surface of the second reflective structure adjacent to the first substrate is any one of a flat surface and a second curved surface, and the second curved surface is any one of a part of a spherical surface, a part of a tapered surface, and an uneven surface.
6. The reflective display panel of claim 5, wherein when the first curved surface and the second curved surface are both part of a spherical surface, the diameter of the spherical surface on which the first curved surface is located and the diameter of the spherical surface on which the second curved surface is located satisfy the following relation:
wherein D represents the diameter of the spherical surface where the first curved surface is located, and D represents the diameter of the spherical surface where the second curved surface is located.
7. The reflective display panel according to claim 3, further comprising: a retaining wall structure disposed between the first substrate and the second substrate, and a filter layer disposed between the first substrate and the first reflective structure,
the retaining wall structure includes: a plurality of pixel opening regions and a light-impermeable region disposed between adjacent pixel opening regions;
the filter layer includes: the light shielding layer corresponds to the light-tight region, and the color filters correspond to the pixel opening regions.
8. The reflective display panel according to claim 7, wherein the height of the dam structure and the height of the second reflective structure satisfy the following relation in a plane perpendicular to the reflective display panel:
wherein, H represents the height of the retaining wall structure, and H represents the height of the second reflecting structure.
9. The reflective display panel of claim 7, wherein the number of reflective columns in the pixel opening regions corresponding to color filters of the same color in the plurality of color filters is the same, and/or the number of reflective columns in the pixel opening regions corresponding to at least two color filters of different colors in the plurality of color filters is different.
10. The reflective display panel of claim 7, wherein the total number of reflective columns is less than the total number of lenses in at least one pixel opening area.
11. The reflective display panel according to claim 7, wherein the material of the at least one reflective pillar is any one of acrylic resin and epoxy resin.
12. A display device, comprising: the reflective display panel of any one of claims 1 to 11.
13. A method of manufacturing a reflective display panel according to any one of claims 1 to 6, the method comprising:
providing a first substrate and a second substrate;
forming a first reflective structure on the first substrate;
forming a second reflective structure on the second substrate;
and filling ink containing black particles between the first substrate and the second substrate to form an ink structure layer.
14. A method of manufacturing a reflective display panel according to any one of claims 7 to 11, the method comprising:
providing a first substrate and a second substrate;
forming a first reflection structure and the retaining wall structure on the first substrate, and forming a second reflection structure on the second substrate, or forming a first reflection structure on the first substrate, and forming a second reflection structure and the retaining wall structure on the second substrate;
and filling ink containing black particles between the first substrate and the second substrate to form an ink structure layer.
15. The method according to claim 14, wherein the second reflective structure and the dam structure are formed by a nano-imprinting method.
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