A reflective display panel, manufacturing method and display device

Abstract

The application discloses a reflective display panel, a manufacturing method and a display device. The display panel of one embodiment comprises: a first substrate; a second substrate arranged opposite to the first substrate; a lens array on the side of the second substrate facing the first substrate, the lens array comprising an arc surface; a barrier structure between the first substrate and the second substrate; an adjusting structure between adjacent barrier structures on the first substrate; each adjusting structure is configured to adjust the distance between the surface on the side of the adjusting structure close to the lens array and the arc surface in response to an input voltage signal, so as to change the display state of the reflective display panel. The display panel of the embodiment of the application changes the distance between the surface on the side close to the lens array and the arc surface by using the adjusting structure, realizes the change of the display state of the reflective display panel, and effectively improves the refractive index and display brightness in the bright state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display. More particularly, it relates to a reflective display panel, a manufacturing method and a display device. BACKGROUND

[0002] At present, according to the type of light source (including: backlight or ambient light) used by the display device, the display device can be divided into three types: transmissive, reflective and semi-transmissive. Among them, the reflective display panel realizes display by reflecting the ambient light incident into the reflective display panel. Since the reflective display panel does not need to additionally set up a backlight module to provide backlight for its display, the reflective display panel has been widely concerned and applied. However, the reflective display panel in some technologies has the problem of low reflectivity in bright state display. SUMMARY

[0003] The present application aims to provide a display panel and a manufacturing method thereof, and a display device, to solve at least one of the problems in the prior art.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] The first aspect of the present application provides a reflective display panel, comprising:

[0006] a first substrate;

[0007] a second substrate disposed opposite to the first substrate;

[0008] a lens array located on the side of the second substrate facing the first substrate, the lens array comprising an arc surface;

[0009] a barrier structure located between the first substrate and the second substrate;

[0010] an adjusting structure located between adjacent barrier structures on the first substrate;

[0011] Each of the adjusting structures is configured to adjust the distance between the surface on the side of the adjusting structure close to the lens array and the arc surface in response to the voltage signal accessed, so as to change the display state of the reflective display panel.

[0012] Further, the surface on the side of the adjusting structure close to the lens array is a first surface;

[0013] The barrier structure, the first surface and the arc surface on the side of the lens array facing the first substrate form a plurality of vacuum chambers.

[0014] Furthermore, when the display panel is in the first display state, the adjustment structure is in the initial state, and the distance between the first surface and the arc surface is a first distance

[0015] When the display panel is in the second display state, the first surface and the arc-shaped surface are in contact with each other;

[0016] When the display panel is in a third display state, the distance between the lens array and the first surface is a second distance, and the second distance is smaller than the first distance.

[0017] Furthermore, a first electrode is located in an opening region formed by adjacent retaining wall structures on the first substrate;

[0018] an electrostrictive layer located on a surface of the first electrode on a side close to the second substrate;

[0019] a second electrode corresponding to the first electrode and located on a surface of the electrostrictive layer close to the second substrate;

[0020] a first color filter layer located on a surface of the second electrode on a side close to the second substrate;

[0021] The surface of the first color filter layer close to the lens array serves as the first surface;

[0022] In response to the voltage signals inputted to the first electrode and the second electrode, the thickness of the electrostrictive layer in the stacking direction of the display panel changes.

[0023] Furthermore, the refractive index of the lens array is greater than the refractive index of the first color filter layer;

[0024] The first color filter layer includes a first red color filter unit, a first green color filter unit, a first blue color filter unit and a black color filter unit respectively located in each of the opening areas;

[0025] or

[0026] The first color filter layer is made of elastic material.

[0027] Furthermore, the material of the electrostrictive layer is lead magnesium oxide or lead titanate solid solution.

[0028] Furthermore, when the display panel is in the fourth display state, each of the adjustment structures adjusts the distance between each of the first surfaces and the arc-shaped surface in response to a corresponding voltage signal.

[0029] Furthermore, the regulating structure is a MEMS structure, and the MEMS structure includes:

[0030] a third electrode located on the first substrate;

[0031] the fourth electrode located on the second substrate;

[0032] a supporting layer having an elastic cavity and located between the third electrode and the fourth electrode; and

[0033] a black elastic layer located on a surface of the supporting layer close to the lens array, wherein the surface of the black elastic layer close to the lens array is a second surface;

[0034] In response to the voltage signals of the third electrode and the fourth electrode, the thickness of the MEMS structure in the stacking direction of the display panel changes to adjust the distance between the second surface and the arc surface.

[0035] Furthermore, the retaining wall structure, the second surface and the arc-shaped surface form a plurality of vacuum chambers.

[0036] Furthermore, when the display panel is in the fifth display state, the adjustment structure is in the initial state, and the distance between the second surface and the arc-shaped surface is a third distance;

[0037] When the display panel is in the sixth display state, the second surface and the arc-shaped surface are in contact with each other;

[0038] When the display panel is in the seventh display state, the distance between the lens array and the second surface is a fourth distance, and the fourth distance is smaller than the third distance;

[0039] or

[0040] When the display panel is in the eighth display state, each of the adjustment structures adjusts the distance between each of the second surfaces and the arc-shaped surface in response to a corresponding voltage signal.

[0041] Furthermore, the display panel further includes:

[0042] a light filter layer located between the second substrate and the lens array, the light filter layer comprising a light shielding layer provided at a position corresponding to the retaining wall structure and a second color filter layer located between adjacent light shielding layers;

[0043] The second color filter layer includes a second red color filter unit, a second green color filter unit, and a second blue color filter unit, which are respectively located in opening areas formed by adjacent retaining wall structures.

[0044] A second aspect of the present invention provides a method for manufacturing the reflective display panel according to the first aspect of the present invention, the method comprising: forming a lens array on a second substrate;

[0045] forming the retaining wall structure on the first substrate;

[0046] forming the adjustment structure between adjacent retaining wall structures on the first substrate;

[0047] With respect to the first substrate and the second substrate, each of the adjustment structures is configured to adjust the distance between the surface of one side of the adjustment structure close to the lens array and the arc surface in response to an input voltage signal to change the display state of the reflective display panel.

[0048] Furthermore, forming the adjustment structure between adjacent retaining wall structures on the first substrate further includes:

[0049] forming a first electrode in an opening region between adjacent retaining wall structures on the first substrate;

[0050] forming an electrostrictive layer on a surface of the first electrode close to the second substrate;

[0051] A second electrode is formed on a surface of the electrostrictive layer close to the second substrate, corresponding to the first electrode;

[0052] A first color filter layer is formed on a surface of the second electrode close to the second substrate.

[0053] Furthermore, forming the adjustment structure between adjacent retaining wall structures on the first substrate further includes:

[0054] forming the fourth electrode on the second substrate;

[0055] forming a third electrode on the first substrate;

[0056] forming a supporting layer having an elastic cavity on the third electrode;

[0057] forming a black elastic layer on the supporting layer, wherein in response to voltage signals from the third electrode and the fourth electrode, the thickness of the MEMS structure in the stacking direction of the display panel changes to adjust the distance between the second surface and the arc-shaped surface;

[0058] or

[0059] Before forming the lens array on the second substrate, the method further includes:

[0060] A filter layer is formed on the second substrate, wherein the filter layer includes a light shielding layer arranged at a position corresponding to the retaining wall structure and a second color filter layer located between adjacent light shielding layers.

[0061] A third aspect of the present invention provides a display device, comprising the reflective display panel provided by the first aspect of the present invention.

[0062] The beneficial effects of the present invention are as follows:

[0063] The technical solution described in the embodiment of the present invention eliminates the structure of the ink material layer of the mainstream reflective display panel, and uses an adjustment structure to change the distance between the surface on the side close to the lens array and the curved surface, thereby changing the display state of the reflective display panel, realizing a steady-state display of the reflective display panel, effectively improving the refractive index and display brightness in the bright state, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0065] Figure 1a A schematic diagram showing the structure of a conventional E-Ink reflective display panel in a bright state display;

[0066] Figure 1b A schematic diagram showing the structure of a conventional E-Ink reflective display panel in a dark state;

[0067] Figure 2 A schematic structural diagram showing a reflective display panel in a first display state according to an embodiment of the present invention;

[0068] Figure 3 A schematic structural diagram showing a reflective display panel in a third display state according to an embodiment of the present invention;

[0069] Figure 4 A schematic structural diagram showing a reflective display panel in a fourth display state according to an embodiment of the present invention;

[0070] Figure 5 A schematic structural diagram showing a reflective display panel in a second display state according to an embodiment of the present invention;

[0071] Figure 6 A schematic diagram showing a process for manufacturing a reflective display panel according to another embodiment of the present invention;

[0072] Figure 7 A schematic diagram showing a process of manufacturing an adjustment structure for a reflective display panel according to an optional embodiment of the present invention;

[0073] Figure 8 A schematic structural diagram showing a reflective display panel in a fifth display state according to another embodiment of the present invention;

[0074] Figure 9A schematic structural diagram showing a reflective display panel in a seventh display state according to another embodiment of the present invention;

[0075] Figure 10 A schematic structural diagram showing a reflective display panel in a sixth display state according to another embodiment of the present invention;

[0076] Figure 11 A schematic structural diagram showing an adjustment structure of an optional embodiment of the present invention;

[0077] Figure 12 A schematic diagram showing a process flow of manufacturing an adjustment structure according to an optional embodiment of the present invention;

[0078] Figures 13a to 13f Showing an alternative embodiment of the production Figure 11 Schematic diagram of the process flow of the regulating structure shown. DETAILED DESCRIPTION

[0079] It should also be noted that, in the description of the present invention, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0080] Reflective display panels utilize ambient light to display images. They can achieve clear displays in both bright and dim light conditions, offering advantages such as low drive voltage, energy efficiency, and minimal damage to the eyes. Currently, reflective display panels include electronic ink (E-Ink) and clear ink (CID) reflective display devices.

[0081] The working principle of the E-Ink reflective display panel in the existing technology is: when a voltage is applied to the electrodes in the reflective display panel, the white particles in the ink will move to the surface of the dielectric layer on the display side, and the black particles in the ink will move to the side opposite to the display side. At this time, the light will be reflected to achieve a bright display; when a voltage is applied to the electrodes in the reflective display, the white particles in the ink will move to the side opposite to the display side, and the black particles in the ink will move to the surface of the dielectric layer on the display side. At this time, the light will be directly absorbed to achieve a dark display.

[0082] Prior art, Figure 1a Schematic diagram of the structure of the prior art E-Ink reflective display panel in bright state display. Figure 1b Schematic diagram of the structure of the E-Ink reflective display panel in dark state display.

[0083] like Figure 1a and Figure 1b As shown, the reflective display panel may include: a first substrate 111 and a second substrate 121 arranged opposite to each other, a first electrode 112 arranged on a side of the first substrate 111 close to the second substrate 121, a second electrode 122 arranged on a side of the second substrate 121 close to the first substrate 111, and a microcapsule 13 arranged between the first electrode 112 and the second electrode 122. The microcapsule 13 may include: ink 14 containing white particles 141 (also known as white ink particles or white microsphere particles) and black particles 142 (also known as black ink particles or black microsphere particles), wherein the black particles 142 and the white particles 141 carry different charges. For example, when the first electrode 112 and the second electrode 122 are not powered, the black particles 142 carry a negative charge and the white particles 141 carry a positive charge, and the entire microcapsule 13 is in an electrically balanced state. For example, as Figure 1a As shown in FIG. 1 , when a positive voltage is applied to the first electrode 112, the black particles 142 approach the first electrode 112, and the white particles 141 are distributed above the microcapsules 13. The ambient light incident from the second substrate 121 is reflected at the white particles 141 in the microcapsules 13. At this time, the display device can present a bright display. For example, Figure 1b As shown, when a negative voltage is applied to the first electrode 112, the white particles 141 approach the first electrode 112, and the black particles 142 are distributed above the microcapsule 13. The ambient light incident from the second substrate 121 is absorbed by the black particles 142 in the microcapsule 13. At this time, the display device can present a dark state display.

[0084] The working principle of another CID reflective display panel is: when a voltage is applied to the electrodes in the reflective display panel, the black ink particles in the sub-pixels will move to the side opposite to the display side. At this time, the high refractive index of the dielectric layer and the low refractive index of the electronic ink are used to achieve total reflection to realize bright display; when a voltage is applied to the electrodes in the reflective display panel, the black ink particles in the sub-pixels will move to the surface of the dielectric layer on the display side, so that the light will be directly absorbed to realize dark display.

[0085] Compared with E-ink reflective display panels, CID reflective display panels have the advantages of low driving voltage, low energy consumption and the ability to achieve color display. However, CID reflective display panels also have the disadvantages of low reflectivity and low display brightness. Low display brightness can easily cause visual fatigue, which directly affects people's acceptance of reflective displays.

[0086] Based on this problem, one embodiment of the present invention provides a reflective display panel to solve the above problem.

[0087] like Figures 2 to 4 As shown, the reflective display panel 3 of the embodiment of the present invention includes: a first substrate 31;

[0088] a second substrate 32 disposed opposite to the first substrate 31;

[0089] A lens array 33 is located on the side of the second substrate 32 facing the first substrate 31, and the lens array includes an arcuate surface 331. For example, the diameter of the lenses in the lens array may be 5-50 μm, and the arch height may be 5-30 μm;

[0090] a retaining wall structure 34 located between the first substrate 31 and the second substrate 32;

[0091] an adjustment structure 35 located between adjacent retaining wall structures 34 on the first substrate 31;

[0092] Each of the adjustment structures is configured to adjust the distance between the surface of the adjustment structure 35 close to the lens array 33 and the arc surface 331 in response to an input voltage signal, so as to change the display state of the reflective display panel.

[0093] The technical solution described in the embodiment of the present invention eliminates the structure of the ink material layer of the mainstream reflective display panel, and uses an adjustment structure to change the distance between the surface on the side close to the lens array and the curved surface, thereby changing the display state of the reflective display panel, realizing a steady-state display of the reflective display panel, and effectively improving the refractive index and display brightness in the bright state.

[0094] Now Figure 2 The reflective display panel shown is described as an embodiment. In an optional embodiment, as Figure 2 As shown, the surface of the adjustment structure 35 close to the lens array 33 is the first surface; the retaining wall structure 34, the first surface 351 and the arc surface 331 of the lens array 33 facing the first substrate 31 form a plurality of vacuum chambers.

[0095] In such Figure 2In the state shown, the display panel is in a first display state, i.e., a bright state. In this state, the adjustment structure 33 is in an initial state, i.e., no thickness change occurs, and the distance between the first surface 351 and the curved surface 331 is not adjusted. That is to say, in this state, the volume of the vacuum chamber formed by the retaining wall structure 34, the first surface 351, and the curved surface 331 of the lens array 33 facing the first substrate 31 is the largest, and the first distance between the first surface 351 and the curved surface 331 is the maximum value.

[0096] This embodiment applies the total reflection phenomenon to a reflective display panel. The total reflection phenomenon refers to the phenomenon that when light is emitted from a denser medium (n1) to a less dense medium (n2), the refracted light does not appear in the less dense medium due to a refraction angle greater than or equal to 90 degrees. In this embodiment, the difference in the refractive index of the two materials is used to form total reflection to achieve a white state, and the movement of black particles under an electric field destroys the total reflection to achieve a black state. Figure 2 In the first display state (bright state) shown, the surface contacted by the lens array is the vacuum area in the vacuum chamber. The lower the refractive index of the interface in contact with the lens array (LENs), the higher the reflectivity during total reflection. That is to say, assuming that the refractive index of the lens array is 1.6-2.3, the refractive index of the vacuum area in contact with the lens array (LENs) is 1.0, which is lower than the refractive index of the ink material layer in contact with the lens array in the prior art. Therefore, by utilizing the low refractive index of the vacuum, the reflectivity of the display panel of this embodiment in the bright state can be greatly improved, further improving the display brightness of the display panel and realizing steady-state display under bright state display.

[0097] In the display panel of this embodiment, when the adjustment structure changes the distance between the first surface and the lens surface, the display state of the display panel is also changed.

[0098] In an optional embodiment, if Figure 3 As shown, when the display panel is in the third display state, the distance between the arc surface 331 of the lens array 33 and the first surface 351 is a second distance, and the second distance is smaller than the first distance.

[0099] In this state, if Figure 3 As shown, under the action of the adjustment structure 35, the length of the vacuum chamber becomes shorter, and the distance between the first surface 351 and the curved surface 331 of the lens array becomes smaller. In other words, the first surface 351 shown in FIG1 moves toward the lens array 33, forming Figure 3 In the intermediate state shown in FIG. 1 , the third display state is an intermediate grayscale state of the display panel, which is lower than the bright state and higher than the dark state. Figure 3 and Figure 4During the corresponding display state adjustment process, the adjustment distance of each adjustment structure 35 located in the plurality of opening areas is the same, that is, the distance between the first surface 351 of each adjustment structure 35 and the arc surface 331 after adjustment is the same.

[0100] Considering this adjustment method, i.e., the adjustment distance of each adjustment structure is the same, during the adjustment process from the third display state (intermediate grayscale state) to the second display state (dark state), the red color filter unit 355R, the green color filter unit 355G, and the blue color filter unit 355B will all fit with the curved surface, and this fitting method will affect the display effect in the dark state. Therefore, in an optional embodiment, if Figure 4 As shown, when the display panel is in the fourth display state, each of the adjustment structures 35 adjusts the distance between each of the first surfaces 351 and the arc surface 331 in response to a corresponding voltage signal.

[0101] In this embodiment, the thickness changed by each adjustment structure is set to be different, that is, each adjustment structure can adjust a different distance. Figure 4 As shown, each adjustment structure is connected to a different voltage signal, and the thickness of the adjustment structure corresponding to the red color film unit 355R is changed differently from the thickness of the adjustment structure 35 corresponding to the black color film unit 355black. The adjustment method of this embodiment can also achieve an intermediate grayscale state, and can realize flexible adjustment of the distance between any color film unit and the curved surface.

[0102] Furthermore, in Figure 4 In the fourth display state and the corresponding adjustment mode shown, in an optional embodiment, as shown in FIG. Figure 5 As shown, when the display panel is in the second display state (dark state), part of the first surface 351 and the arc surface 331 are in contact with each other. Figure 4 In the state shown, the adjustment structure 35 further controls the first surface 351 to move toward the lens array 33. For example, each adjustment structure receives a different voltage signal. For example, the adjustment structure 35 corresponding to the black color film unit 355black increases in thickness according to the voltage signal until the first surface 351 of the black color film unit 355black is in contact with the arc surface 331, while the first surfaces of the color film units of other colors are not in contact with the arc surface, thereby forming Figure 5 The display state diagram shown in FIG. 1 is a third display state of a dark state.

[0103] To achieve the above-mentioned state adjustment, in an optional embodiment, as Figures 2 to 5 The regulating structure 35 includes a first electrode 352 , a second electrode 354 , an electrostrictive layer 353 , and a first color filter layer 355 .

[0104] In this embodiment, the first electrode 352 is located in an opening area formed by adjacent retaining wall structures 34 on the first substrate 31 , that is, one first electrode 352 corresponds to one opening area and one adjustment structure.

[0105] The electrostrictive layer 353 is located on the surface of the first electrode 352 on the side closest to the second substrate 32. The thickness of the electrostrictive layer 353 in this embodiment can be changed under different voltages. When a first voltage is applied, the thickness of the electrostrictive layer is a first thickness. When a second voltage is applied, the thickness of the electrostrictive layer can be changed to a second thickness. The second thickness of the electrostrictive layer at the second voltage can be increased or decreased compared to the first thickness at the first voltage. Those skilled in the art can change the thickness of the electrostrictive layer according to the applied voltage state, and this will not be further described here.

[0106] In an optional embodiment, the electrostrictive layer is made of a solid solution of lead magnesium oxide or lead titanate. This configuration allows the thickness of the electrostrictive layer to be varied. The present invention is not limited to the specific material of the electrostrictive layer, nor is it limited to using only lead magnesium oxide or lead titanate as a solid solution. Those skilled in the art can design the electrostrictive layer based on actual applications, and this will not be elaborated upon here.

[0107] For example, the thickness of the electrostrictive layer may be 1-20 μm, and those skilled in the art may also design it according to actual applications, which will not be described in detail here.

[0108] In this embodiment, Figures 2 to 5 As shown, a second electrode 354 corresponding to the first electrode 352 is located on the surface of the electrostrictive layer 353 on the side close to the second substrate 32. The second electrode 354 is arranged corresponding to the first electrode 352, that is, the second electrode 354 is also arranged in the opening area formed by the adjacent retaining wall structure 34. Under the voltage applied by the first electrode 352 and the second electrode 354, the electrostrictive layer 353 in the opening area deforms in response to the voltage signal, that is, the thickness in the layer structure direction changes.

[0109] Compared with existing technology Figure 1a As shown, in this embodiment, the structures of the electrodes originally designed on the curved surface of the lens array and the electrodes provided on the first substrate are changed. The first electrode 352 and the second electrode 354 are provided in the opening area, and the electrostrictive layer 353 is provided between the first electrode 352 and the second electrode 354. In this way, the distance between the first surface 351 and the curved surface 331 can be adjusted by the electrostrictive layer 353.

[0110] In this embodiment, Figures 2 to 5As shown, the display panel further comprises a first color filter layer 355 located on the side surface of the second electrode 354 close to the second substrate 32, and the surface of the first color filter layer 355 close to the side of the lens array 33 serves as the first surface 351. The first color filter layer 355 comprises a first red color filter unit 355R, a first green color filter unit 355G, a first blue color filter unit 355B, and a black color filter unit 355black. The structure of the first color filter layer in the embodiment is different from that in the prior art. The first color filter layer is not provided with a black matrix, and the first color filter layer 355 comprises the black color filter unit 355black. In the third display state (dark state), the black color filter unit 355black is attached to the arc-shaped surface, so as to realize dark state display. In order to realize the attachment of the color filter unit to the arc-shaped surface, in an optional embodiment, the color filter unit in the embodiment is elastic, and an acrylic resin material or the like can be selected.

[0111] Based on the structure, in order to further improve the display effect of the display panel, in an optional embodiment, the number of the black color filter unit 355black is greater than the number of the red color filter unit 355R, the green color filter unit 355G, and the blue color filter unit 355B, for example, a plurality of black color filter units are arranged between the color filter units of adjacent colors.

[0112] In an optional embodiment, the refractive index of the lens array is greater than the refractive index of the first color filter layer. In the embodiment, the refractive index of the lens array is still set to be greater than the refractive index of the first color filter layer, so as to apply the total reflection phenomenon to the reflective display panel, to realize a higher refractive index except for the first display state, and effectively improve the display brightness.

[0113] Further, the area of the color filter unit in the embodiment can be designed according to actual application. For example, the light emitting area of one red pixel can correspond to three red color filter units, for example, the light emitting area of one blue pixel can correspond to the area of four red color filter units, or for example, the light emitting area of one green pixel can correspond to the area of two green color filter units. Those skilled in the art should design the pixel and the color filter unit according to actual application, which will not be described here.

[0114] Now, the manufacturing process of the display panel will be described. Figure 2The manufacturing process of the method is described by taking the reflective display panel as an example. The "patterning process" in the embodiment of the present application includes deposition, coating photoresist, mask exposure, development, etching, stripping photoresist and other processes, which are mature preparation processes. The deposition can adopt known processes such as sputtering, evaporation, chemical vapor deposition, the coating can adopt known coating processes, and the etching can adopt known methods, which are not limited herein. In the description of the embodiment of the present application, "thin film" refers to a thin film of a certain material on a substrate prepared by deposition or coating process. If the "thin film" does not need patterning process or photolithography process during the entire manufacturing process, the "thin film" can also be referred to as "layer". If the "thin film" still needs patterning process or photolithography process during the entire manufacturing process, it is referred to as "thin film" before the patterning process and "layer" after the patterning process. The "layer" after the patterning process or photolithography process contains at least one "pattern".

[0115] In another embodiment of the present application, as shown in the figure, the method comprises: Figure 6

[0116] S1, forming a lens array 33 on a second substrate 32.

[0117] Exemplarily, the lens diameter of the lens array of the embodiment can be 5-50um, and the arch height can be 5-30um.

[0118] S2, forming the dam structure 34 on the first substrate 31.

[0119] Exemplarily, the dam structure can adopt a support material with good support, such as Figure 2 As shown, adjacent dam structures form an opening area.

[0120] Exemplarily, after forming the dam, a frame sealant is also formed in the boundary area of the first substrate.

[0121] S3, forming the adjusting structure 35 between the adjacent dam structures 34 on the first substrate 31.

[0122] Exemplarily, adjacent dam structures form an opening area, and an adjusting structure is formed in each opening area, as shown in the figure, that is, this step comprises: Figure 7

[0123] S31, forming a first electrode 352 in the opening area between the adjacent dam structures 34 on the first substrate 31.

[0124] S32, forming a piezoelectric layer 353 on the surface of the first electrode 352 close to the second substrate 32.

[0125] ​​S33 , forming a second electrode 354 on a surface of the electrostrictive layer 353 close to the second base 32 , corresponding to the first electrode 352 .

[0126] S34 , forming a first color filter layer 355 on the surface of the second electrode 354 on the side close to the second substrate 32 .

[0127] Furthermore, the first color filter layer 355 of this embodiment includes a first red color filter unit 355R, a first green color filter unit 355G, a first blue color filter unit 355B and a black color filter unit 355black. That is, in the process of forming the first color filter layer, it is necessary to form the first red color filter unit, the first green color filter unit, the first blue color filter unit and the black color filter unit in different opening areas respectively.

[0128] In a specific example, a driving thin film transistor (not shown) is further formed on the first substrate for outputting a driving signal. The regulating structure of this embodiment is then formed on the surface of the driving thin film transistor away from the first substrate.

[0129] S4. Align the first substrate 31 and the second substrate 32, and each of the adjustment structures is configured to adjust the distance between the first surface 331 and the arc surface 351 in response to an input voltage signal to change the display state of the reflective display panel.

[0130] For example, the box-aligning process of the first substrate and the second substrate can be completed in a vacuum chamber environment, so that the first surface 351 of the first color film layer 35, the retaining wall structure 34, and the curved surface 331 of the lens array 33 after box-aligning form a vacuum chamber, ensuring that the curved surface of the lens array is in contact with the vacuum area when the display panel is in the first display state.

[0131] The process of this embodiment does not add complex process steps and is simple to manufacture. The reflective display panel formed using this embodiment of the present invention eliminates the ink material layer structure of mainstream reflective display panels. By using an adjustment structure to change the distance between the surface near the lens array and the curved surface, the display state of the reflective display panel is changed, achieving a steady-state display of the reflective display panel and effectively improving the refractive index and display brightness in the bright state.

[0132] The display panels based on the prior art and the display panels of the above embodiments require power to maintain each grayscale during implementation, which has the disadvantage of poor battery life and cannot achieve the bistability effect of E-ink technology, affecting the application of electronic reader products.

[0133] like Figures 8 to 10As shown, the embodiment of the present invention provides another embodiment of a reflective display panel for adjusting the distance between the first surface and the curved surface, which can further achieve steady-state display.

[0134] In an optional embodiment, the regulating structure is a MEMS structure, such as Figure 8 As shown, the MEMS structure located in the opening area formed by the adjacent retaining wall structure 34 includes:

[0135] a third electrode 81 located on the first substrate 31;

[0136] The fourth electrode 82 is located on the second substrate 32;

[0137] a supporting layer 83 having an elastic cavity and located between the third electrode (not shown) and the fourth electrode 82; and

[0138] a black elastic layer 84 located on a surface of the support layer 83 close to the lens array 33 , wherein the surface of the black elastic layer 84 close to the lens array 33 is a second surface 841 ;

[0139] In response to the voltage signals of the third electrode and the fourth electrode 82 , the thickness of the MEMS structure in the stacking direction of the display panel changes to adjust the distance between the second surface 841 and the arc surface 331 .

[0140] The present invention mechanically controls the position change of the black elastic layer through the MEMS structure to achieve grayscale display in different states. By utilizing the hysteresis effect inherent in the electromechanical properties of the MEMS structure, it can also achieve steady-state display with high refractive index and high brightness characteristics, and has broad application prospects and competitiveness.

[0141] For example, the black elastic layer of this embodiment may be formed of carbon black and methyl vinyl silicone rubber, which has high elasticity and high tensile properties.

[0142] In an optional embodiment, the retaining wall structure 34 , the second surface 841 , and the arcuate surface 331 form a plurality of vacuum chambers.

[0143] In such Figure 8 In the state shown, the display panel is in the fifth display state, i.e., the bright state. In this state, the adjustment structure is in the initial state, i.e., no adjustment is performed. That is, in this state, the volume of the vacuum chamber formed by the retaining wall structure 34, the second surface 841 and the curved surface 331 is the largest, and the third distance between the second surface and the curved surface is the maximum value.

[0144] This embodiment applies the total reflection phenomenon to the reflective display panel. Figure 2In the first display state (bright state) shown, the surface contacted by the lens array is the vacuum area in the vacuum chamber. The lower the refractive index of the interface in contact with the lens array (LENs), the higher the reflectivity during total reflection. That is to say, assuming that the refractive index of the lens array is 1.6-2.3, the refractive index of the vacuum area in contact with the lens array (LENs) is 1.0, which is lower than the refractive index of the ink material layer in contact with the lens array in the prior art. Therefore, by utilizing the low refractive index of the vacuum, the reflectivity of the display panel of this embodiment in the bright state can be greatly improved, further improving the display brightness of the display panel and realizing steady-state display under bright state display.

[0145] In another optional embodiment, as Figure 9 As shown, when the display panel is in the seventh display state (intermediate state), the distance between the arc surface 331 of the lens array 33 and the second surface 841 is a fourth distance, and the fourth distance is smaller than the third distance.

[0146] In this state, if Figure 9 As shown, under the action of the adjustment structure, the length of the vacuum chamber becomes shorter, and the distance between the second surface 841 and the arc surface 331 of the lens array 33 becomes smaller. Figure 8 The second surface 841 shown moves toward the lens array 33 driven by the adjustment structure, forming Figure 9 In the intermediate state shown, in the seventh display state, the display panel is in an intermediate grayscale state which is lower than the bright state display and higher than the dark state display.

[0147] In another optional embodiment, as Figure 10 As shown, when the display panel is in the sixth display state (dark state), the second surface 841 and the arc surface 331 are in contact with each other. Figure 10 In the state shown, the adjustment structure further controls the second surface 841 to move toward the lens array 33 until the second surface 841 and the arc surface 331 are completely in contact with each other, thereby forming Figure 10 Schematic diagram of the display state shown in FIG. 1 , in this state, the third display state is a dark state.

[0148] In a specific example, under the adjustment of the adjustment structure, the distance between the second surface 841 of the black elastic layer 83 and the curved surface 331 of the lens array 33 is 10um, and the reflectivity of the display panel is 72%; when the second surface of the black elastic layer and the curved surface of the lens array are tangent, the reflectivity of the display panel is 50%; when the second surface 841 of the black elastic layer 83 and the curved surface 331 of the lens array 33 are completely fitted together, the reflectivity of the display panel is 4.2%, achieving dark state display, and the entire grayscale state process has good stability and good display effect.

[0149] In another optional embodiment, when the display panel is in the eighth display state, each of the adjustment structures adjusts the distance between each of the second surfaces and the arc-shaped surface in response to a corresponding voltage signal.

[0150] That is, in this embodiment, the thickness changed by each adjustment structure is set to be different. For example, each adjustment structure is connected to a different voltage signal, and the adjustment structure located in each opening area can change the position of the supporting layer respectively, so that different supporting layers have different positions in the opening area, thereby changing the distance between the second surface and the arc surface in different vacuum chambers to achieve different grayscale state displays.

[0151] To achieve the aforementioned adjustment, in an optional embodiment, the display panel further comprises a filter layer (not shown) positioned between the second substrate and the lens array. The filter layer comprises a light-shielding layer positioned corresponding to the retaining wall structure and a second color filter layer positioned between adjacent light-shielding layers. The second color filter layer comprises a second red color filter unit, a second green color filter unit, and a second blue color filter unit. The second color filter layer of this embodiment is positioned differently from the first color filter layer of the previous embodiment and is used to filter light to produce different colors.

[0152] In this embodiment, the fourth electrode is provided on the second substrate, illustratively, formed between the filter layer and the second substrate. Those skilled in the art can design it according to actual applications, which will not be described in detail here.

[0153] In a specific example, Figure 11 As shown, the MEMS structure of this embodiment can be:

[0154] The insulating layer 91 on the first substrate may include, for example, a first insulating layer 911, a second insulating layer 912, and a third insulating layer 913 stacked in sequence. In a specific example, the second insulating layer may be made of silicon dioxide, and the third insulating layer may be made of silicon nitride.

[0155] The third electrode 92 is located on the insulating layer 91.

[0156] a dielectric layer 93 covering the third electrode 92;

[0157] A supporting layer 83 with an elastic cavity located on the dielectric layer 93;

[0158] A black elastic layer 84 is located on the supporting layer 83 .

[0159] like Figure 11As shown, the support layer 83 includes a vertical support layer 831 and a horizontal support layer 832 arranged in a plane, in response to the third electrode 92 and the fourth electrode ( Figure 8 82) in the vertical support layer, the volume of the cavity formed by the vertical support layer 831 and the horizontal support layer 832 can change in the vertical direction, thereby driving the position of the black elastic layer 84 set on the horizontal support layer 831 to change, and further causing the distance and contact area between the second surface 841 of the black elastic layer 84 and the arc surface 331 to change, thereby realizing grayscale display in different states.

[0160] Now let’s take an example process to Figure 8 In another embodiment of the present invention, the method includes:

[0161] S1. Form a filter layer (not shown) on the second substrate 32.

[0162] Exemplarily, the filter layer includes a light-shielding layer disposed at a position corresponding to the retaining wall structure and a second color filter layer located between adjacent light-shielding layers.

[0163] S2. Form a lens array 33 on the second substrate 32.

[0164] The arch height and diameter of the lens array in this embodiment can be determined by those skilled in the art and will not be described in detail here.

[0165] S3 . Forming the retaining wall structure 34 on the first substrate 31 .

[0166] The above process can refer to the step flow of the aforementioned embodiment. Those skilled in the art can also select the process flow according to the adaptability of the actual application, which will not be described here in detail.

[0167] S4. Form the adjustment structure between adjacent retaining wall structures 34 on the first substrate 31 .

[0168] In another optional embodiment, the adjustment structure of this embodiment is as follows Figure 11 The MEMS structure shown in Figure 12 As shown, this step may include:

[0169] S41. Form the fourth electrode on the second substrate.

[0170] In this embodiment, the fourth electrode may be disposed between the filter layer and the second substrate.

[0171] S42, forming an insulating layer 91 on the first substrate (not shown in the figure), and forming a third electrode 92 on the insulating layer 91, thereby forming Figure 13aThe structure shown.

[0172] Exemplarily, when the insulating layer 91 of this embodiment is multi-layer, the step further includes: forming a first insulating layer 911 on a first substrate, then forming a second insulating layer 912 whose material is silicon dioxide on the first insulating layer 911, and forming a third insulating layer 913 whose material is silicon nitride on the second insulating layer 912.

[0173] Exemplarily, the third electrode is low temperature polysilicon.

[0174] S43 , forming a dielectric layer 93 on the third electrode 92 .

[0175] Exemplarily, before forming the dielectric layer, this step includes patterning the insulating layer 91 and the third electrode 92. Figure 13b As shown, the dielectric layer is formed between the patterned via holes and on the third electrode.

[0176] S44 , forming a supporting layer 83 having an elastic cavity on the dielectric layer 93 .

[0177] like Figure 11 As shown, the support layer 83 includes a vertical support layer 831 arranged vertically and a horizontal support layer 832 arranged in a plane. The vertical support layer and the horizontal support layer together form an elastic cavity with a variable volume.

[0178] Exemplarily, this step may further include:

[0179] A sacrificial layer 10 is formed on the dielectric layer using LPCVD process, thereby forming Figure 13c The structure shown in FIG. 1 is illustratively a sacrificial layer made of phosphosilicate glass. The sacrificial layer is patterned by photolithography and etching to form a via hole, thereby forming Figure 13d The structure shown in FIG5 is then formed by forming a vertical support layer at the via hole and a horizontal support layer on the vertical support layer and the sacrificial layer, thereby forming Figure 13e The structure shown.

[0180] S45, forming a black elastic layer on the supporting layer, thereby forming Figure 13f The layer structure shown.

[0181] S46, peeling off the sacrificial layer to form the elastic cavity of the supporting layer, and the formed MEMS adjustment structure is as follows Figure 11 shown.

[0182] The above process is simple and does not add complicated process steps.

[0183] It is worth noting that the above steps are a process of forming an adjustment structure, that is, forming an adjustment structure in an opening area located in an adjacent retaining wall structure. In the process, the adjustment structures located in other opening areas can be formed in the same layer in the same process. Those skilled in the art can adjust the layer structure of MEMS according to actual applications, which will not be repeated here.

[0184] S5. Align the first substrate and the second substrate, and each of the adjustment structures is configured to adjust the distance between the first surface and the arc-shaped surface in response to an input voltage signal to change the display state of the reflective display panel.

[0185] For example, the box-aligning process of the first substrate and the second substrate can be completed in a vacuum chamber environment, so that the surface of the black elastic layer, the retaining wall structure, and the curved surface of the lens array after box-aligning form a vacuum chamber, ensuring that the curved surface of the lens array is in contact with the vacuum area when the display panel is in bright display.

[0186] In response to the voltage signals of the third electrode and the fourth electrode, the volume of the elastic cavity can change in the vertical direction, thereby driving the position of the black elastic layer arranged on the horizontal support layer to change, and further causing the distance and contact area between the second surface and the curved surface of the black elastic layer to change, thereby realizing grayscale display in different states.

[0187] The process of this embodiment does not add complex process steps and is simple to manufacture. The reflective display panel formed using this embodiment of the present invention eliminates the ink material layer structure of mainstream reflective display panels. By using an adjustment structure to change the distance between the surface near the lens array and the curved surface, the display state of the reflective display panel is changed, achieving a steady-state display of the reflective display panel and effectively improving the refractive index and display brightness in the bright state.

[0188] It is worth noting that the present invention does not limit the display panel of the embodiment of the present invention to be manufactured by the above-mentioned method as the only method. That is, the display panel of the embodiment of the present invention manufactured by other methods is also within the protection scope of the embodiment of the present invention.

[0189] Since the display panel manufacturing method provided in the embodiment of the present invention corresponds to the display panels provided in the aforementioned embodiments, the aforementioned embodiments are also applicable to the display panel manufacturing method provided in this embodiment and will not be described in detail in this embodiment. It should be understood by those skilled in the art that the aforementioned embodiments and the resulting beneficial effects are also applicable to this embodiment, and therefore, the identical parts will not be described in detail.

[0190] Another embodiment of the present invention provides a display device comprising the display panel described in the above embodiment. For example, the display device can be any product or component requiring a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigation system, or vehicle-mounted central control gear lever, although the embodiments of the present disclosure are not limited thereto.

[0191] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in this field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A reflective display panel, characterized in that: include: a first substrate; a second substrate disposed opposite to the first substrate; a lens array located on a side of the second substrate facing the first substrate, the lens array comprising a curved surface; a retaining wall structure located between the first substrate and the second substrate; an adjustment structure located between adjacent retaining wall structures on the first substrate; Each of the adjustment structures is configured to adjust the distance between a surface of the adjustment structure on a side close to the lens array and the arc surface in response to an input voltage signal, so as to change a display state of the reflective display panel; The regulating structure comprises: a first electrode located in an opening region formed by adjacent retaining wall structures on the first substrate; an electrostrictive layer located on a surface of the first electrode on a side close to the second substrate; a second electrode corresponding to the first electrode and located on a surface of the electrostrictive layer close to the second substrate; a first color filter layer located on a surface of the second electrode on a side close to the second substrate; The surface of the first color filter layer close to the lens array serves as the first surface; In response to the voltage signals inputted to the first electrode and the second electrode, the thickness of the electrostrictive layer in the stacking direction of the display panel changes.

2. The display panel according to claim 1, wherein: The surface of the adjustment structure close to the lens array is a first surface; The retaining wall structure, the first surface, and the arc-shaped surface of the lens array facing the first substrate form a plurality of vacuum chambers.

3. The display panel according to claim 2, wherein: When the display panel is in a first display state, the adjustment structure is in an initial state, and the distance between the first surface and the arc-shaped surface is a first distance; When the display panel is in the second display state, a portion of the first surface is in contact with the arc-shaped surface; When the display panel is in a third display state, the distance between the lens array and the first surface is a second distance, and the second distance is smaller than the first distance.

4. The display panel according to claim 1, wherein: The refractive index of the lens array is greater than the refractive index of the first color filter layer; The first color filter layer includes a first red color filter unit, a first green color filter unit, a first blue color filter unit and a black color filter unit respectively located in each of the opening areas; or The first color filter layer is made of elastic material.

5. The display panel according to claim 1, wherein: The material of the electrostrictive layer is lead magnesium oxide or lead titanate solid solution.

6. The display panel according to any one of claims 1 to 5, wherein: When the display panel is in the fourth display state, each of the adjustment structures adjusts the distance between each of the first surfaces and the arc-shaped surface in response to a corresponding voltage signal.

7. A method for manufacturing a display panel according to any one of claims 1 to 6, characterized in that: The method comprises: forming a lens array on the second substrate; forming the retaining wall structure on the first substrate; forming the adjustment structure between adjacent retaining wall structures on the first substrate; The first substrate and the second substrate are aligned, and each of the adjustment structures is configured to adjust the distance between a surface of the adjustment structure close to the lens array and the arc surface in response to an input voltage signal, so as to change a display state of the reflective display panel; Wherein, forming the adjustment structure between adjacent retaining wall structures on the first substrate further comprises: forming a first electrode in an opening region between adjacent retaining wall structures on the first substrate; forming an electrostrictive layer on a surface of the first electrode close to the second substrate; A second electrode is formed on a surface of the electrostrictive layer close to the second substrate, corresponding to the first electrode; A first color filter layer is formed on a surface of the second electrode close to the second substrate.

8. A display device, characterized in that: include: The display panel according to any one of claims 1 to 6.

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