Reflective display panel, preparation method and display device

Abstract

The invention discloses a reflective display panel, a preparation method and a display device, relates to the technical field of display, and can improve the contrast ratio of the reflective display panel. The reflective display panel comprises a first substrate which comprises a first optical structure and a first electrode, and the first optical structure is used for gathering light; the second substrate is arranged opposite to the first substrate, and the second substrate comprises a second optical structure; the plurality of accommodating cavities and the plurality of second electrodes are arranged between the first electrode and the second optical structure; the orthographic projection of the second electrode on the second substrate at least partially surrounds the orthographic projection of the accommodating cavity on the second substrate, and the first electrode and the second electrode are insulated from each other; optical particles are accommodated in the accommodating cavity, are used for absorbing light or reflecting light, and are driven by the first electrode and the second electrode to move; the second optical structure is used for reflecting light to be matched with the light-absorbing optical particles, or the second optical structure is used for absorbing light to be matched with the light-reflecting optical particles.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a reflective display panel, a preparation method and a display device. Background Art

[0002] At present, the mechanism of reflective E-ink (Electronic ink) technology is to use electrophoresis technology to control the up and down of black and white particles in microcapsules to achieve the brightness and darkness of the reflective state; in the improved E-ink technology, when external light enters the display, the microlens under the display has a higher refractive index and can achieve total reflection, that is, it appears in a bright state; when an external voltage is applied, the black particles adhere to the surface of the microlens, and at this time the external light enters the microlens and is completely absorbed, presenting a dark state.

[0003] However, in the dark mode, light needs to pass through the total reflection interface before being absorbed by the black particles, which results in insufficient absorption of dark light and easily causes dark light leakage, resulting in a low contrast ratio of existing reflective display panels. Summary of the invention

[0004] Embodiments of the present application provide a reflective display panel, a preparation method, and a display device, which can improve the contrast of the reflective display panel.

[0005] According to a first aspect of an embodiment of the present application, a reflective display panel is provided, comprising:

[0006] A first substrate, comprising a first optical structure and a first electrode which are stacked;

[0007] a second substrate, arranged opposite to the first substrate, the second substrate comprising a second optical structure, the second optical structure being arranged on a side of the second substrate close to the first substrate, the first optical structure being used to gather external light incident from a side of the first optical structure away from the second substrate, and to gather light emitted from a side of the first optical structure away from the second substrate;

[0008] A plurality of accommodating cavities, disposed between the first electrode and the second optical structure;

[0009] A plurality of second electrodes are disposed between the first electrode and the second optical structure, the orthographic projections of the second electrodes on the second substrate at least partially surround the orthographic projections of the accommodating cavity on the second substrate, and the first electrodes and the second electrodes are insulated from each other;

[0010] The containing cavity contains optical particles, the optical particles are used for absorbing or reflecting light, and the optical particles are used for moving under the driving of the first electrode and the second electrode;

[0011] The second optical structure is used to reflect light to match the optical particles that absorb light, or the second optical structure is used to absorb light to match the optical particles that reflect light.

[0012] In some embodiments, the first optical structure includes a convex lens array, the convexities of the convex lens array are oriented toward a side away from the second substrate, and the convex curved surface of the convex lens array is used to receive external light and emit display light.

[0013] In some embodiments, the convex lens array includes a plurality of convex lenses, and the convex lenses are arranged in a one-to-one correspondence with the accommodating cavities or the convex lenses are arranged in a many-to-one correspondence with the accommodating cavities.

[0014] In some embodiments, the focal length and curvature radius of the convex lens satisfy the following relationship:

[0015] f=r / (n-1),

[0016] Wherein, f is the focal length of the convex lens, r is the radius of curvature of the convex lens, and n is the refractive index of the convex lens;

[0017] and / or,

[0018] The thickness of the first optical structure and the curvature radius of the convex lens satisfy the following relationship:

[0019] h=r-(r 2 -d 2 / 4) 1 / 2 ,

[0020] Wherein, h is the thickness of the first optical structure, r is the radius of curvature of the convex lens, and d is the maximum outer diameter of one end of the convex lens close to the first electrode;

[0021] and / or,

[0022] The maximum outer diameter of one end of the convex lens close to the first electrode ranges from 1 μm to 10 mm.

[0023] In some embodiments, the convex lens array is disposed on a side of the first electrode close to the second substrate, and the convex vertices of the convex lens array are disposed close to the first electrode;

[0024] The refractive index of a medium between the convex lens array and the first electrode is smaller than the refractive index of the convex lens array.

[0025] In some embodiments, the convex lens array is disposed on a side of the first electrode away from the second substrate, and a convex vertex of the convex lens array is disposed away from the first electrode.

[0026] In some embodiments, the second electrode is disposed on a side wall of the accommodating cavity in a thickness direction of the reflective display panel; or,

[0027] The second electrode is disposed at one end of the accommodating cavity close to the second optical structure.

[0028] In some embodiments, the reflective display panel further includes:

[0029] A retaining wall structure, the retaining wall structure is arranged between adjacent accommodating cavities, and the retaining wall structure is used to separate the accommodating cavities;

[0030] The second electrode is disposed on a side surface of the retaining wall structure in a thickness direction of the reflective display panel.

[0031] In some embodiments, the first substrate includes a first substrate, the first substrate is disposed between the first electrode and the first optical structure, and the refractive index of the first substrate is less than the refractive index of the first optical structure;

[0032] The second substrate includes a second substrate, and the second substrate is arranged on a side of the second optical structure away from the first substrate.

[0033] In some embodiments, a first dielectric layer is disposed on a side of the first electrode away from the first substrate; and / or,

[0034] In the case where the second optical structure includes a conductive material, a second dielectric layer is disposed between the second optical structure and the second electrode.

[0035] In some embodiments, when the second optical structure is used for reflecting light, the second optical structure comprises metal or a coating containing reflective particles;

[0036] In the case where the second optical structure comprises metal, the thickness of the second optical structure ranges from 10 nm to 2 μm;

[0037] In case the second optical structure comprises a coating layer containing reflective particles, the thickness of the second optical structure is in the range of 10 nm to 50 μm.

[0038] In some embodiments, the reflective display panel further includes:

[0039] a plurality of driving devices, wherein the driving devices are electrically connected to the second electrode;

[0040] The first electrode is used to access a common voltage, and the second electrode is used to access a driving voltage;

[0041] The second electrodes on the same inner wall of the accommodating cavity are used to access the same driving voltage.

[0042] In some embodiments, the reflective display panel further includes:

[0043] A cover plate, wherein air or optical glue is disposed between the first optical structure and the cover plate, and the refractive indexes of the air and the optical glue are both smaller than the refractive index of the first optical structure.

[0044] In some embodiments, the reflective display panel further includes:

[0045] A filter layer is arranged on a side of the first optical structure away from the second substrate, the filter layer comprises a plurality of filter structures, and the filter structures comprise color filter materials;

[0046] The orthographic projection of the filter structure on the second substrate covers the orthographic projection of the accommodating cavity on the second substrate.

[0047] A second aspect of the embodiments of the present application provides a method for preparing a reflective display panel, which is used to prepare the reflective display panel as described in the first aspect, and the preparation method includes:

[0048] A first substrate and a second substrate are provided respectively, wherein the first substrate comprises a first optical structure and a first electrode which are stacked, and the second substrate comprises a second optical structure;

[0049] Disposing a plurality of second electrodes on the first substrate or the second substrate, and disposing a plurality of accommodating cavities on the first substrate or the second substrate, wherein the orthographic projections of the second electrodes on the second substrate at least partially surround the orthographic projections of the accommodating cavities on the second substrate;

[0050] injecting optical particles into the containing cavity;

[0051] The first substrate and the second substrate are arranged opposite to each other, so that the second electrode and the accommodation cavity are arranged between the first substrate and the second substrate.

[0052] In some embodiments, providing the first substrate includes:

[0053] Disposing a first electrode on one side of the first substrate;

[0054] Disposing a first dielectric layer on a side of the first electrode away from the first substrate;

[0055] Arranging a first optical structure on a side of the first substrate away from the first electrode to obtain the first substrate;

[0056] The second substrate is provided, comprising:

[0057] Disposing a second optical structure on one side of the second substrate;

[0058] Disposing a plurality of driving devices on a side of the second optical structure facing away from the second substrate;

[0059] The step of providing a plurality of the second electrodes on the second substrate comprises:

[0060] A plurality of second electrodes are arranged on a side of the second substrate having the second optical structure, so as to form a plurality of accommodating cavities with openings in a thickness direction of the second substrate, wherein the openings are located at an end of the second electrode away from the second optical structure, and an end of the second electrode close to the second optical structure is electrically connected to the driving device;

[0061] The step of injecting optical particles into the containing cavity comprises:

[0062] Ink is injected into the containing cavity, wherein the ink includes a solvent and optical particles.

[0063] According to a third aspect of the embodiments of the present application, a display device is provided, including:

[0064] A reflective display panel as described in the first aspect.

[0065] The reflective display panel provided by the embodiment of the present application, by setting the second electrode in the thickness direction of the reflective display panel, by setting the first optical structure and the second optical structure at both ends of the accommodating cavity, under the drive of the first electrode and the second electrode, the optical particles can be distributed close to the second electrode, distributed close to the first electrode or free, and the second optical structure is matched with the state of the optical particles to realize the display of dark state, bright state and gray scale. Therefore, the reflective display panel provided by the embodiment of the present application can replace the total reflection interface structure of the existing electrophoretic reflective display panel, without setting the total reflection interface, and can directly absorb light by using the light-absorbing optical particles, or directly absorb light by using the light-absorbing second optical structure, so that the dark state light leakage caused by the total reflection interface can be eliminated. In addition, the first optical structure is set on the side of the first electrode away from the accommodating cavity, so that after the incident light passes through the first optical structure for one convergence, all the outgoing light passes through the first optical structure for the second convergence of the light, which can significantly improve the brightness of the bright state display. The reflective display panel provided by the present application, combined with a better dark state effect and a brighter bright state effect, can improve the contrast of the reflective display panel and also improve the response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A schematic partial structural diagram of a reflective display panel provided in an embodiment of the present application;

[0067] Figure 2 A schematic partial structural diagram of a reflective display panel provided in an embodiment of the present application;

[0068] Figure 3 A schematic partial structural diagram of an electrophoretic reflective display panel provided in an embodiment of the present application;

[0069] Figure 4 A schematic partial structural diagram of another electrophoretic reflective display panel provided in an embodiment of the present application;

[0070] Figure 5 A schematic partial structural diagram of another reflective display panel provided in an embodiment of the present application;

[0071] Figure 6 A schematic partial structural diagram of another reflective display panel provided in an embodiment of the present application;

[0072] Figure 7 A schematic diagram of a first test structure provided in an embodiment of the present application;

[0073] Figure 8 Another test structure schematic diagram provided for an embodiment of the present application;

[0074] Fig. 9 A schematic partial structural diagram of a reflective display panel provided in an embodiment of the present application;

[0075] Fig.10 A schematic partial structural diagram of another reflective display panel provided in an embodiment of the present application;

[0076] Fig.11 A schematic partial structural diagram of a reflective display panel provided in an embodiment of the present application;

[0077] Fig.12 A schematic partial structural diagram of another reflective display panel provided in an embodiment of the present application;

[0078] Fig.13 A schematic partial structural diagram of another reflective display panel according to an embodiment of the present application;

[0079] Fig.14 A schematic flow chart of a method for preparing a reflective display panel provided in an embodiment of the present application

[0080] Fig.15 A schematic structural diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0081] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0082] In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0083] At present, the mechanism of reflective E-ink technology is to use electrophoresis technology to control the up and down of black and white particles in microcapsules to achieve the brightness and darkness of the reflective state; in the improved E-ink technology, when external light enters the display, the microlens below the display has a higher refractive index, which can achieve total reflection, that is, present a bright state; when an external voltage is applied, the black particles are attached to the surface of the microlens, and the external light enters the microlens and is completely absorbed, presenting a dark state. However, in the dark state mode, the light needs to pass through the total reflection interface before being absorbed by the black particles, and there is a problem of insufficient absorption of dark state light, which is easy to cause dark state light leakage, so the contrast of the existing reflective display panel is low.

[0084] In view of this, embodiments of the present application provide a reflective display panel, a preparation method and a display device, which can improve the contrast of the reflective display panel.

[0085] In a first aspect of an embodiment of the present application, a reflective display panel is provided. Figure 1 This is a schematic partial structural diagram of a reflective display panel provided in an embodiment of the present application. Figure 1As shown, the reflective display panel includes: a first substrate 100, a second substrate 200, a plurality of accommodating cavities 300 and a plurality of second electrodes 400. The first substrate 100 includes a first optical structure 110 and a first electrode 120, and the first optical structure 110 and the first electrode 120 are stacked; the second substrate 200 is arranged opposite to the first substrate 100, and the second substrate 200 includes a second optical structure 210, and the second optical structure 210 is arranged on a side of the second substrate 200 close to the first substrate 100, and the first optical structure is used to gather external light incident from the side of the first optical structure away from the second substrate, and to gather light emitted from the side of the first optical structure away from the second substrate; the accommodating cavity 300 is arranged between the first electrode 120 and the second optical structure 210; The second electrode 400 is arranged between the first electrode 120 and the second optical structure 210. The orthographic projection of the second electrode 400 of the reflective display panel on the second substrate at least partially surrounds the orthographic projection of the accommodating cavity on the second substrate. The first electrode 120 and the second electrode 400 are insulated from each other. The accommodating cavity 300 contains optical particles 301, and the optical particles 301 are used to absorb or reflect light. The optical particles 301 are used to move under the drive of the first electrode 120 and the second electrode 400. The second optical structure 210 is used to reflect light to match the optical particles 301 that absorb light, or the second optical structure 210 is used to absorb light to match the optical particles 301 that reflect light.

[0086] It should be noted that the optical particles provided in the embodiments of the present application have light reflecting properties or light absorbing properties, and the second optical structure can be used for light reflecting or light absorbing. Figure 1 The optical particles 301 shown have light absorbing properties, and the second optical structure 210 is used for reflecting light. Figure 1 The performance matching between the optical particles and the second optical structure is only shown for illustration purposes. The optical particles can also reflect light and absorb light in combination with the second optical structure.

[0087] It should be noted that Figure 1 In the reflective display panel shown, the second electrode 400 serves as a side wall of the accommodating cavity 300 and is disposed between the first substrate 100 and the second substrate 200 .

[0088] Exemplary, reference Figure 1 When a voltage is applied to the first electrode 120 and the second electrode 400, an electric field may be formed. Figure 1 The electric field direction shown is that the first electrode 120 points to the second electrode 400, and the electric field strength is the first electric field strength E1. In other embodiments, the electric field direction can also be that the second electrode 400 points to the first electrode 120, and both the electric field strength and the electric field direction can be determined according to the applied voltage difference.

[0089] refer to Figure 1, under the action of the first electric field intensity, the optical particles 301 move to the surface of the second electrode 400, and the ambient light L outside the reflective display panel passes through the first optical structure 110 and the first electrode 120 in sequence to enter the accommodating cavity 300, and the ambient light L reaches the second optical structure 210 and is reflected, and then passes through the first electrode 120 and the first optical structure 110 again to emit out of the reflective display panel, so that the picture display can be realized. Since the optical particles 301 are distributed on the surface of the second electrode 400, there is no light shielding in the accommodating cavity 300, and the reflective performance of the second optical structure 210 can be used to realize the bright state display of the reflective display panel.

[0090] For example, Figure 2 This is a schematic partial structural diagram of a reflective display panel provided in an embodiment of the present application. Figure 2 As shown, the accommodating cavity 300 includes a first accommodating cavity 310 and a second accommodating cavity 320. The first electrode 120 and the second electrode 400 in the first accommodating cavity 310 apply corresponding voltages to form an electric field in which the second electrode 400 points to the direction of the first electrode 120. The electric field strength is the second electric field strength E2. Under the action of the second electric field strength E2, the optical particles 301 in the first accommodating cavity 310 are distributed on the side wall of the accommodating cavity 300 close to the first electrode 120. Then, the external ambient light L will be absorbed by the light-absorbing optical particles 301, and no light will be emitted from the first accommodating cavity 310. The first electrode 120 and the second electrode 400 in the second accommodating cavity 320 apply corresponding voltages to form an electric field in which the first electrode 120 points to the direction of the second electrode 400, and the electric field strength is the third electric field strength E3. Under the action of the third electric field strength E3, part of the optical particles 301 in the second accommodating cavity 320 are distributed on the side wall of the accommodating cavity 300 close to the first electrode 120, part of the optical particles 301 are distributed on the surface of the second electrode 400, and part of the optical particles 301 are in a free state. Then, part of the ambient light L from the outside will be absorbed by the optical particles 301 that absorb light, and part of the ambient light L is reflected on the surface of the second optical structure 210 to obtain the first light L1. Then, part of the light is emitted from the second accommodating cavity 300, the first accommodating cavity 310 is in a dark state, and the second accommodating cavity 320 is in a grayscale display state, and the specific number of grayscales is determined by the third electric field strength E3. It should be noted that the second electric field strength E2 is greater than the third electric field strength E3. Exemplarily, each accommodating cavity 300 can be used as a sub-pixel for displaying a picture.

[0091] It should be noted that Figure 3 This is a schematic partial structural diagram of an electrophoretic reflective display panel provided in an embodiment of the present application. Figure 3As shown, ink 002 and lens 004 are arranged between the lower electrode 001 and the upper electrode 005. The ink 002 contains black particles 003 for absorbing light. The lower electrode 001 and the upper electrode 005 can form an electric field. Under the action of the electric field, the black particles 003 are distributed on the side close to the lower electrode 001. The ambient light L is totally reflected at the interface between the lens 004 and the ink 002, and a bright display can be achieved. Figure 4 This is a schematic partial structural diagram of another electrophoretic reflective display panel provided in an embodiment of the present application. Figure 4 As shown, under the electric field formed by the lower electrode 001 and the upper electrode 005, the black particles 003 are distributed on the interface between the lens 004 and the ink 002, and the ambient light L is incident on the black particles 003 at the interface between the lens 004 and the ink 002 and is absorbed to achieve dark display. Figure 4 In the electrophoretic reflective display panel shown, in the dark state display, light needs to pass through the total reflection interface and then be absorbed by the black particles 003. In the process of passing through the total reflection interface, a half-wavelength effect will occur, and the black particles 003 will not completely absorb the light, that is, there will be a dark state light leakage phenomenon. Since the contrast of the reflective display panel is the ratio of the brightness of the bright state to the brightness of the dark state, the existing electrophoretic reflective display panel will have a poor contrast due to the dark state light leakage problem.

[0092] The reflective display panel provided in the embodiment of the present application is provided with the second electrode 400 in the thickness direction of the reflective display panel, and with the first optical structure 110 and the second optical structure 210 at both ends of the accommodating cavity 300. Under the drive of the first electrode 120 and the second electrode 400, the optical particles 301 can be distributed close to the second electrode 400, distributed close to the first electrode 120 or free, and the second optical structure 210 can be used in combination with the state of the optical particles 301 to realize the display of dark state, bright state and gray scale. Therefore, the reflective display panel provided in the embodiment of the present application can replace the total reflection interface structure of the existing electrophoretic reflective display panel, and there is no need to set the total reflection interface. The light-absorbing optical particles 301 can be used to directly absorb light, or the light-absorbing second optical structure 210 can be used to directly absorb light, so that the dark state light leakage caused by the total reflection interface can be eliminated. In addition, the first optical structure 110 is arranged on the side of the first electrode 120 away from the accommodating cavity 300, so after the incident light is converged once by the first optical structure 110, all the outgoing light is converged twice by the first optical structure 110, which can significantly improve the brightness of the bright state display. The reflective display panel provided by the present application combines a better dark state effect and a brighter bright state effect, can improve the contrast of the reflective display panel, and can also improve the response speed.

[0093] For example, the optical particle 301 may be a charged particle, which may be positively charged or negatively charged, which is not specifically limited in the present embodiment. The optical particle 301 may be charged as a whole or on the surface, for example, the surface coating may be charged. Figure 1 and Figure 2 The light absorbing optical particles 301 shown may be black particles.

[0094] In some embodiments, Figure 5 This is a schematic partial structural diagram of another reflective display panel provided in an embodiment of the present application. Figure 5 As shown, the first optical structure 110 includes a convex lens array, the convex lens array is convex toward the side away from the second substrate, and the convex lens array is convex toward the display side, which can play a role in converging light. The convex curved surface of the convex lens array is used to receive external light and emit display light. The convex lens array includes a plurality of convex lenses 111, and the convex lenses 111 are arranged in a one-to-one correspondence with the accommodating cavities. That is, each convex lens 111 is arranged corresponding to an accommodating cavity 300, and each convex lens 111 can converge the display light of each sub-pixel, thereby improving the brightness and reducing the occurrence rate of color deviation.

[0095] In some embodiments, the convex lenses 111 and the accommodating cavities 300 are arranged in a multiple-to-one manner, that is, each sub-pixel of the accommodating cavity 300 corresponds to multiple convex lenses 111, which can be set according to the preparation process accuracy of the specific convex lens array, or according to the optical parameter requirements, and the embodiments of the present application do not make specific limitations.

[0096] For example, continue to refer to Figure 5 , the optical particles 301 are white particles and can be used for reflecting light; the second optical structure 210 is a light absorbing material and can be used for absorbing light. Under the action of the first electric field strength E1 formed by the first electrode 120 and the second electrode 400, the optical particles 301 are distributed on the surface of the second electrode 400. The ambient light L outside the reflective display panel passes through the first optical structure 110 and the first electrode 120 in sequence and enters the accommodating cavity 300. The ambient light L reaches the second optical structure 210 and is absorbed to achieve dark state display.

[0097] For example, Figure 6 This is a schematic partial structural diagram of another reflective display panel provided in an embodiment of the present application. Figure 6As shown, corresponding voltages are applied to the first electrode 120 and the second electrode 400 in the first accommodating cavity 310 to form an electric field in which the second electrode 400 points in the direction of the first electrode 120, and the electric field strength is the second electric field strength E2. Under the action of the second electric field strength E2, the optical particles 301 in the first accommodating cavity 310 are distributed on the side wall of the accommodating cavity 300 close to the first electrode 120, and then the external ambient light L will be reflected by the reflective optical particles 301, and a bright display can be achieved. Corresponding voltages are applied to the first electrode 120 and the second electrode 400 in the second accommodating cavity 320 to form an electric field in which the first electrode 120 points to the direction of the second electrode 400, and the electric field strength is the third electric field strength E3. Under the action of the third electric field strength E3, some optical particles 301 in the second accommodating cavity 320 are distributed on the side wall of the accommodating cavity 300 close to the first electrode 120, some optical particles 301 are distributed on the surface of the second electrode 400, and some optical particles 301 are in a free state. Then, part of the external ambient light L will be reflected by the reflective optical particles 301 to obtain the second light L2, and part of the ambient light L is absorbed by the second optical structure 210, then some light is emitted from the second accommodating cavity 300, the first accommodating cavity 310 is in a dark state, and the second accommodating cavity 320 is in a grayscale display state, and the specific number of grayscales is determined by the third electric field strength E3.

[0098] It should be noted that the reference Figure 1 , Figure 2 , Figure 5 and Figure 6 The side where the ambient light L is incident is the same as the side where the light is emitted, which is the display side of the reflective display panel.

[0099] In some embodiments, the focal length and curvature radius of the convex lens 111 satisfy the following relationship:

[0100] f=r / (n-1),

[0101] Wherein, f is the focal length of the convex lens 111 , r is the curvature radius of the convex lens 111 , and n is the refractive index of the convex lens 111 .

[0102] In some embodiments, reference Figure 6 , the thickness of the first optical structure 110 and the curvature radius of the convex lens 111 satisfy the following relationship:

[0103] h=r-(r 2 -d 2 / 4) 1 / 2 ,

[0104] Wherein, h is the thickness of the first optical structure 110, r is the radius of curvature of the convex lens 111, and d is the maximum outer diameter of one end of the convex lens 111 close to the first electrode.

[0105] Exemplarily, the maximum outer diameter of the end of the convex lens 111 close to the first electrode 120 ranges from 1 μm to 10 mm.

[0106] Exemplarily, when f is determined, r is determined immediately, and h can be calculated. If h needs to be lowered, a higher refractive index glue can be used, that is, h decreases as r increases. Parameter example: For a 254ppi product, the pixel spacing d = 100μm, assuming that the convex lens 111 corresponds to the sub-pixel one-to-one, then the diameter of the convex lens 111 is 100μm. Assuming that the design goal of the convex lens 111 is to converge the ambient light and approach the parallel light incident on the glass reflective layer, and assuming that the box thickness is 7μm and the glass thickness is 0.5mm, the box thickness can be ignored at this time, that is, f = 0.5mm, and r = 1mm is calculated, and the height of the spherical lens is 1.25μm.

[0107]

[0108] Table 1

[0109] For example, Figure 7 A schematic diagram of a first test structure provided in an embodiment of the present application; Figure 8 Another test structure diagram provided in the embodiment of the present application. Figure 7 As shown, the lens is arranged with the convex surface facing upward, and a substrate subs is arranged under the glass substrate glass, and the substrate subs comprises a metal mirror, white paper and air, simulating the embodiment of the present application. Figure 5 and Figure 6 The reflective display panel structure. Figure 8 As shown, the convex surface of the lens is set downward, and a substrate is set under the lens to simulate Figure 3 and Figure 4 The structure of the electrophoretic reflective display panel is shown. The test light is irradiated from top to bottom to test the specular reflectivity and diffuse reflectivity respectively.

[0110] For example, Table 1 is the image panel simulation contrast test data provided by the example of this application. Referring to Table 1, the mirror and white paper can be tested separately, and different positions can be changed to measure three times to eliminate disturbances. The results show that the mirror's specular reflection accounts for the majority, and the white paper's diffuse reflection accounts for the majority.

[0111] refer to Figure 7 , white paper and a metal mirror are placed under the glass respectively to represent the bright state of the reflective display panel. The results show that the reflectivity is about 71% when white paper is placed under the glass, and the reflectivity is about 53% when a metal mirror is placed under the glass. When the substrate is suspended in the air, that is, in the air, and the room is kept dark, it represents the dark state, and its brightness is about 29%; the contrast ratio of the white paper in the bright state is 2.44, and the contrast ratio of the mirror in the bright state is 1.82.

[0112] refer to Figure 8 , the lens facing downward is a traditional reflective display structure. When white paper and mirror are placed under the glass, their reflectivity is 82% and 75% respectively, and the dark state reflectivity is 64%. The calculated contrast ratio of white paper in bright state is 1.28, and the contrast ratio of mirror in bright state is 1.17.

[0113] Refer to Table 1, Figure 7 The structural brightness is relative to Figure 8 Although the bright state of the structure is reduced by 13.4%, the dark state brightness is only 45% of the traditional structure, so it has a contrast advantage.

[0114] In addition, in the reflective display panel provided in the embodiment of the present application, the convex lens 111 in the first optical structure 110 protrudes toward the display side, which can converge the outgoing light, further improve the brightness of the bright state, and further improve the contrast.

[0115] In some embodiments, Fig. 9 This is a schematic partial structural diagram of a reflective display panel provided in an embodiment of the present application. Fig. 9 As shown, the convex lens array is arranged on the side of the first electrode 120 close to the second substrate 200, and the protruding apex of the convex lens array is arranged close to the first electrode 120, that is, the first optical structure 110 is arranged between the first electrode 120 and the second substrate 200, which does not affect the convergence effect of the first optical structure 110; the refractive index of the medium between the convex lens array and the first electrode 120 is smaller than the refractive index of the convex lens array, that is, air or other media can be arranged in the gap between the convex lens 111 and the first electrode 120, and the refractive index of the air and other media needs to be smaller than the refractive index of the convex lens 111.

[0116] refer to Figure 5 and Figure 6 , the first electrode 120 is disposed between the convex lens array and the second substrate 200 . Figure 5 and Fig. 9 The convex vertices of the convex lenses 111 shown are all facing the side away from the second substrate 200 .

[0117] In some embodiments, Fig.10 This is a schematic partial structural diagram of another reflective display panel provided in an embodiment of the present application. Fig.10 As shown, the reflective display panel further includes a retaining wall structure 401, which is disposed between the first substrate 100 and the second substrate 200 to form a plurality of accommodating cavities 300, and the second electrode 400 is disposed on the periphery of the retaining wall structure 401, and the second electrode 400 is disposed at one end of the retaining wall structure 401 close to the second substrate 200, so as to form an electric field between the first electrode 120 and the second electrode 400. Fig.10An electric field with a third electric field strength E3 can be formed between the first electrode 120 and the second electrode 400 , and the electric field is directed from the first electrode 120 to the second electrode 400 .

[0118] In some embodiments, Fig.11 This is a schematic partial structural diagram of a reflective display panel provided in an embodiment of the present application. Fig.11 As shown, the reflective display panel further includes a retaining wall structure 401, which is disposed between adjacent accommodating cavities 300 and is used to separate the accommodating cavities 300; the second electrode 400 is disposed on the side surface of the retaining wall structure 401 in the thickness direction of the reflective display panel.

[0119] For example, Figure 1 , Figure 2 , Figure 5 and Figure 6 In the reflective display panel shown in FIG. 1 , the second electrode 400 may enclose a plurality of accommodating cavities 300 in the thickness direction of the reflective display panel. Fig.11 As shown, the retaining wall structure 401 can enclose a plurality of accommodating cavities 300, and the second electrode 400 is disposed on the side surface of the retaining wall structure 401. The retaining wall structure 401 can be made of a conductive material or an insulating material, which is not specifically limited in the present embodiment.

[0120] Exemplarily, the dimension of the retaining wall structure 401 in the thickness direction of the reflective display panel ranges from 2 μm to 30 μm, for example, 7 μm. The dimension of the second electrode 400 in the thickness direction of the reflective display panel ranges from 2 μm to 30 μm.

[0121] In some embodiments, Fig.12 This is a schematic partial structural diagram of another reflective display panel provided in an embodiment of the present application. Fig.12 As shown, the first substrate 100 includes a first substrate 130, which is disposed between the first electrode 120 and the first optical structure 110. The refractive index of the first substrate 130 is less than that of the first optical structure 110, and can further converge light. The first substrate 130 can be a glass substrate or other substrates. The second substrate 200 includes a second substrate 220, which is disposed on a side of the second optical structure 210 away from the first substrate 100.

[0122] refer to Fig.12 A first dielectric layer 140 is disposed on a side of the first electrode 120 away from the first substrate 130. The first dielectric layer 140 can insulate the first electrode 120 from the second electrode 400.

[0123] refer to Fig.12In the case where the second optical structure 210 includes a conductive material, such as a metal reflective layer, silver, copper or other reflective metals, a second dielectric layer 230 is disposed between the second optical structure 210 and the second electrode 400, and the thickness of the second dielectric layer 230 may range from 10 nm to 10 μm, and the thickness of the second optical structure 210 may range from 10 nm to 2 μm.

[0124] refer to Fig.12 The reflective display panel also includes a plurality of driving devices 500, which are electrically connected to the second electrode 400; the first electrode 120 is used to access the common voltage, and the second electrode 400 is used to access the driving voltage; the second electrode 400 on the inner wall of the same accommodating cavity 300 is used to access the same driving voltage, that is, the second electrode 400 of each accommodating cavity 300 is independently provided with a driving voltage by the driving device 500, so as to realize the independent light emission control of the sub-pixel. Then, Fig.12 Independent control of different display states of the first accommodating cavity 310 and the second accommodating cavity 320.

[0125] In the meal card Fig.12 The reflective display panel further includes a filter layer 600, which is disposed on a side of the first optical structure 110 away from the second substrate 200. The filter layer 600 includes a plurality of filter structures, and the filter structures include color filter materials. For example, the filter structures include a red filter structure R, a green filter structure G, and a blue filter structure B, which can realize color image display. The orthographic projection of the filter structure on the second substrate 200 covers the orthographic projection of the accommodating cavity 300 on the second substrate 200, and each filter structure and each accommodating cavity 300 form a sub-pixel.

[0126] In some embodiments, Fig.13 FIG. 1 is a schematic partial structural diagram of another reflective display panel according to an embodiment of the present application. Fig.13 As shown, the reflective display panel includes a cover plate 700, which is used to protect the reflective display panel. Air or optical glue can be provided in the gap 800 formed between the first optical structure 110 and the cover plate 700, and the refractive index of the air and the optical glue is smaller than the refractive index of the first optical structure to ensure the convergence effect of the outgoing light.

[0127] Exemplarily, when the second optical structure 210 is used for reflecting light, the second optical structure 210 includes metal or a coating containing reflective particles. When the second optical structure 210 includes metal, the thickness of the second optical structure 210 ranges from 10 nm to 2 μm; when the second optical structure 210 includes a coating containing reflective particles, the thickness of the second optical structure 210 ranges from 10 nm to 50 μm. The reflective coating may include TiO2, MgO or other coatings with diffuse reflective particles. The second dielectric layer may include SiO2, SiNx, etc.

[0128] For example, the first electrode 120 may be a transparent electrode, the thickness of the transparent electrode may be in the range of 5 nm to 1 μm, and the thickness of the first dielectric layer may be in the range of 5 nm to 3 μm. The second electrode 400 may be a metal electrode.

[0129] A second aspect of the embodiments of the present application provides a method for preparing a reflective display panel, which is used to prepare the reflective display panel as described in the first aspect. Fig.14 A schematic flow chart of a method for preparing a reflective display panel provided in an embodiment of the present application. Fig.14 As shown, the method for preparing the reflective display panel includes:

[0130] S901: Dispose a first substrate and a second substrate respectively, wherein the first substrate includes a first optical structure and a first electrode which are stacked, and the second substrate includes a second optical structure.

[0131] In some examples, combined Fig.12 , the providing of the first substrate may include:

[0132] The first electrode 120 is disposed on one side of the first substrate 130 .

[0133] A first dielectric layer 140 is disposed on a side of the first electrode 120 away from the first substrate 130 .

[0134] The first optical structure 110 is disposed on a side of the first substrate 130 facing away from the first electrode 120 to obtain the first base plate 100 .

[0135] Combination Fig.12 , the providing of the second substrate may include:

[0136] The second optical structure 210 is disposed on one side of the second substrate 220 .

[0137] A plurality of driving devices 500 are disposed on a side of the second optical structure 210 facing away from the second substrate 220 .

[0138] It should be noted that the first substrate 100 and the second substrate 200 can be synchronously manufactured in different production lines, which can improve the production cycle.

[0139] S902: Disposing a plurality of second electrodes on the first substrate or the second substrate, and disposing a plurality of receiving cavities on the first substrate or the second substrate, wherein the orthographic projections of the second electrodes on the second substrate at least partially surround the orthographic projections of the receiving cavities on the second substrate.

[0140] It should be noted that the second electrode 400 may be disposed on the first substrate 100 , and the second electrode 400 may also be disposed on the second substrate 200 .

[0141] The step of providing a plurality of the second electrodes on the second substrate comprises:

[0142] Combination Fig.12 A plurality of second electrodes 400 are arranged on one side of the second substrate 200 having the second optical structure 210 to form a plurality of accommodating cavities with openings in the thickness direction of the second substrate 200, wherein the openings are located at one end of the second electrode 400 away from the second optical structure 210, and one end of the second electrode 400 close to the second optical structure 210 is electrically connected to the driving device 500.

[0143] S903: Injecting optical particles into the containing cavity.

[0144] Step S903 may include:

[0145] Ink is injected into the receiving cavity, wherein the ink includes a solvent and optical particles.

[0146] S904: Arrange the first substrate and the second substrate opposite to each other, so that the second electrode and the receiving cavity are arranged between the first substrate and the second substrate.

[0147] According to a third aspect of the embodiments of the present application, a display device is provided. Fig.15 Schematic diagram of a display device provided in an embodiment of the present application. Fig.15 As shown, the display device includes: the reflective display panel 1000 provided in the first aspect.

[0148] It should be noted that the display device provided in the embodiments of the present application may include a smart phone, a tablet computer, a laptop computer, a television, a smart wearable device, etc. The smart wearable device may include a smart watch, VR (virtual reality) / AR (augmented reality) glasses, etc., and the embodiments of the present application do not make specific limitations.

[0149] The display device provided in the embodiment of the present application sets the second electrode 400 of the reflective display panel in the thickness direction of the reflective display panel, and sets the first optical structure 110 and the second optical structure 210 at both ends of the accommodating cavity 300. Under the drive of the first electrode 120 and the second electrode 400, the optical particles 301 can be distributed close to the second electrode 400, close to the first electrode 120, or free, and the state of the optical particles 301 is combined with the second optical structure 210 to realize the display of dark state, bright state and gray scale. Therefore, the reflective display panel provided in the embodiment of the present application can replace the total reflection interface structure of the existing electrophoretic reflective display panel, and there is no need to set the total reflection interface. The light-absorbing optical particles 301 can be used to directly absorb light, or the light-absorbing second optical structure 210 can be used to directly absorb light, so that the dark state light leakage caused by the total reflection interface can be eliminated. In addition, the first optical structure 110 is arranged on the side of the first electrode 120 away from the accommodating cavity 300, so after the incident light is converged once by the first optical structure 110, all the outgoing light is converged twice by the first optical structure 110, which can significantly improve the brightness of the bright state display. The reflective display panel provided by the present application combines a better dark state effect and a brighter bright state effect, can improve the contrast of the reflective display panel, and can also improve the response speed.

[0150] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0151] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0152] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0153] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended to include these modifications and variations.

Claims

1. A reflective display panel, characterized in that: include: A first substrate, comprising a first optical structure and a first electrode which are stacked; a second substrate, arranged opposite to the first substrate, the second substrate comprising a second optical structure, the second optical structure being arranged on a side of the second substrate close to the first substrate, the first optical structure being used to gather external light incident from a side of the first optical structure away from the second substrate, and to gather light emitted from a side of the first optical structure away from the second substrate; A plurality of accommodating cavities, disposed between the first electrode and the second optical structure; A plurality of second electrodes are disposed between the first electrode and the second optical structure, wherein the orthographic projection of the reflective display panel of the second electrode on the second substrate at least partially surrounds the orthographic projection of the accommodating cavity on the second substrate, and the first electrode and the second electrode are insulated from each other; The containing cavity contains optical particles, the optical particles are used for absorbing or reflecting light, and the optical particles are used for moving under the driving of the first electrode and the second electrode; The second optical structure is used to reflect light to match the optical particles that absorb light, or the second optical structure is used to absorb light to match the optical particles that reflect light.

2. The reflective display panel according to claim 1, characterized in that: The first optical structure includes a convex lens array, the convexity of the convex lens array is oriented toward a side away from the second substrate, and the convex curved surface of the convex lens array is used to receive external light and emit display light.

3. The reflective display panel according to claim 2, characterized in that: The convex lens array includes a plurality of convex lenses, and the convex lenses are arranged in a one-to-one correspondence with the accommodating cavities or the convex lenses are arranged in a many-to-one correspondence with the accommodating cavities.

4. The reflective display panel according to claim 3, characterized in that: The focal length and curvature radius of the convex lens satisfy the following relationship: f=r / (n-1), Wherein, f is the focal length of the convex lens, r is the radius of curvature of the convex lens, and n is the refractive index of the convex lens; and / or, The thickness of the first optical structure and the curvature radius of the convex lens satisfy the following relationship: h=r-(r 2 -d 2 / 4) 1 / 2 , Wherein, h is the thickness of the first optical structure, r is the radius of curvature of the convex lens, and d is the maximum outer diameter of one end of the convex lens close to the first electrode; and / or, The maximum outer diameter of one end of the convex lens close to the first electrode ranges from 1 μm to 10 mm.

5. The reflective display panel according to claim 2, wherein: The convex lens array is arranged on a side of the first electrode close to the second substrate, and the convex apex of the convex lens array is arranged close to the first electrode; The refractive index of a medium between the convex lens array and the first electrode is smaller than the refractive index of the convex lens array.

6. The reflective display panel according to claim 2, characterized in that: The convex lens array is arranged on a side of the first electrode away from the second substrate, and the convex vertices of the convex lens array are arranged away from the first electrode.

7. The reflective display panel according to any one of claims 1 to 6, characterized in that: The second electrode is disposed on a side wall of the accommodating cavity in a thickness direction of the reflective display panel; or, The second electrode is disposed at one end of the accommodating cavity close to the second optical structure.

8. The reflective display panel according to any one of claims 1 to 6, characterized in that: Also includes: A retaining wall structure, the retaining wall structure is arranged between adjacent accommodating cavities, and the retaining wall structure is used to separate the accommodating cavities; The second electrode is disposed on a side surface of the retaining wall structure in a thickness direction of the reflective display panel.

9. The reflective display panel according to claim 1, characterized in that: The first substrate comprises a first substrate, the first substrate is arranged between the first electrode and the first optical structure, and the refractive index of the first substrate is smaller than the refractive index of the first optical structure; The second substrate includes a second substrate, and the second substrate is arranged on a side of the second optical structure away from the first substrate.

10. The reflective display panel according to claim 9, characterized in that: A first dielectric layer is disposed on a side of the first electrode away from the first substrate; and / or, In the case where the second optical structure includes a conductive material, a second dielectric layer is disposed between the second optical structure and the second electrode.

11. The reflective display panel according to claim 1, wherein: In the case where the second optical structure is used for reflecting light, the second optical structure comprises metal or a coating containing reflective particles; In the case where the second optical structure comprises metal, the thickness of the second optical structure ranges from 10 nm to 2 μm; In case the second optical structure comprises a coating layer containing reflective particles, the thickness of the second optical structure is in the range of 10 nm to 50 μm.

12. The reflective display panel according to claim 1, wherein: Also includes: a plurality of driving devices, wherein the driving devices are electrically connected to the second electrode; The first electrode is used to access a common voltage, and the second electrode is used to access a driving voltage; The second electrodes on the same inner wall of the accommodating cavity are used to access the same driving voltage.

13. The reflective display panel according to claim 1, characterized in that: Also includes: A cover plate, wherein air or optical glue is disposed between the first optical structure and the cover plate, and the refractive indexes of the air and the optical glue are both smaller than the refractive index of the first optical structure.

14. The reflective display panel according to claim 1, wherein: Also includes: A filter layer is arranged on a side of the first optical structure away from the second substrate, the filter layer comprises a plurality of filter structures, and the filter structures comprise color filter materials; The orthographic projection of the filter structure on the second substrate covers the orthographic projection of the accommodating cavity on the second substrate.

15. A method for preparing a reflective display panel, characterized in that: Used to prepare a reflective display panel according to any one of claims 1 to 14, the preparation method comprising: A first substrate and a second substrate are provided respectively, wherein the first substrate comprises a first optical structure and a first electrode which are stacked, and the second substrate comprises a second optical structure; Disposing a plurality of second electrodes on the first substrate or the second substrate, and disposing a plurality of accommodating cavities on the first substrate or the second substrate, wherein the orthographic projections of the second electrodes on the second substrate at least partially surround the orthographic projections of the accommodating cavities on the second substrate; injecting optical particles into the containing cavity; The first substrate and the second substrate are arranged opposite to each other, so that the second electrode and the accommodation cavity are arranged between the first substrate and the second substrate.

16. The method for preparing a reflective display panel according to claim 15, characterized in that: The first substrate is provided, comprising: Disposing a first electrode on one side of the first substrate; Disposing a first dielectric layer on a side of the first electrode away from the first substrate; Arranging a first optical structure on a side of the first substrate away from the first electrode to obtain the first substrate; The second substrate is provided, comprising: Disposing a second optical structure on one side of the second substrate; Disposing a plurality of driving devices on a side of the second optical structure facing away from the second substrate; The step of providing a plurality of the second electrodes on the second substrate comprises: A plurality of second electrodes are arranged on a side of the second substrate having the second optical structure, so as to form a plurality of accommodating cavities with openings in a thickness direction of the second substrate, wherein the openings are located at an end of the second electrode away from the second optical structure, and an end of the second electrode close to the second optical structure is electrically connected to the driving device; The step of injecting optical particles into the containing cavity comprises: Ink is injected into the containing cavity, wherein the ink includes a solvent and optical particles.

17. A display device, characterized in that: include: A reflective display panel as claimed in any one of claims 1 to 14.

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