Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel, a preparation method thereof and a display device, and relates to the technical field of display, and the display panel comprises a driving substrate, a light-emitting layer, a color conversion layer, a driving circuit layer and a light control layer which are sequentially stacked, the light control layer comprises a plurality of electrophoresis cells which are mutually independent and are arranged corresponding to the sub-pixel areas, orthographic projections of the electrophoresis cells on the driving substrate cover the corresponding sub-pixel areas, and a plurality of charged particles are arranged in the electrophoresis cells; the plurality of charged particles can cover the corresponding sub-pixel regions after being sequentially paved in the horizontal direction and absorb external environment light, so that the corresponding sub-pixel regions are in dark states; and the charged particles can move to one side of the electrophoresis cell under the action of an electric field of the driving circuit layer, so that the corresponding sub-pixel region is in a bright state. According to the technical scheme, the contrast ratio of the display panel can be improved, and meanwhile the display brightness of the display panel is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] Micro-LEDs (Micro Light Emitting Diodes) are a highly promising future display technology due to their self-luminescence, high brightness, high color saturation, ease of assembly, and ability to be scaled up to ultra-large sizes. However, currently, limited by low mass transfer yields, the mainstream technology relies on blue Micro-LEDs combined with quantum dot color conversion to achieve color in Micro-LED display panels.

[0003] In existing technology, when ambient light strikes LED electrodes, it reflects off the light, significantly reducing the contrast of the display product and affecting the image quality. To address this issue, a commonly used method is to attach a quarter-wavelength circular polarizer to the outside of the product to absorb ambient light and improve contrast. However, this method also absorbs the light emitted by the product itself, significantly reducing its brightness. Summary of the Invention

[0004] The main purpose of the present invention is to provide a display panel and a method for manufacturing the same, and a display device, in order to improve the contrast of the display panel and simultaneously improve its display brightness.

[0005] To achieve the above-mentioned object, the present invention proposes a display panel comprising a driving substrate, a light-emitting layer, a color conversion layer, a driving circuit layer, and a light control layer stacked in sequence, wherein the driving substrate is provided with a plurality of sub-pixel areas arranged in an array;

[0006] The light control layer includes a plurality of independent electrochemical cells arranged corresponding to the sub-pixel areas, wherein the orthographic projections of the electrochemical cells on the driving substrate cover the corresponding sub-pixel areas, and a plurality of charged particles are arranged in the electrochemical cells;

[0007] The plurality of charged particles are laid out in sequence along the horizontal direction to cover the corresponding sub-pixel area and absorb the external ambient light, so that the corresponding sub-pixel area displays a dark state;

[0008] The charged particles can move to one side of the electrochemical pool under the action of the electric field of the driving circuit layer, so that the corresponding sub-pixel area displays a bright state.

[0009] In one embodiment, the light control layer includes a plurality of retaining walls and a light encapsulation layer, wherein the plurality of retaining walls are arranged at intervals on the surface of the driving circuit layer facing away from the color conversion layer, and the light encapsulation layer is arranged on the side of the retaining wall facing away from the driving circuit layer. The plurality of retaining walls, the light encapsulation layer, and the driving circuit layer together form a plurality of the electrochemical pools.

[0010] The driving circuit layer corresponding to the interval between two adjacent sub-pixel areas includes an electrically connected driving switch, a first electrode and a second electrode. The first electrode and the second electrode are relatively arranged on both sides of the bottom of the electrophoresis pool to form a horizontal electric field. Under the action of the horizontal electric field, the charged particles can move horizontally to one side of the electrophoresis pool.

[0011] The light-emitting layer includes a plurality of blue micro-light-emitting diodes and a plurality of packaging walls. The plurality of blue micro-light-emitting diodes are fixed at intervals on the surface of the driving substrate and are electrically connected to the driving substrate. Each of the blue micro-light-emitting diodes corresponds to a sub-pixel area, and each of the packaging walls is arranged between two adjacent blue micro-light-emitting diodes.

[0012] The color conversion layer includes multiple red quantum dots, multiple green quantum dots, multiple scattering particles, multiple quantum dot walls and a quantum dot encapsulation layer. The red quantum dots, green quantum dots and scattering particles are arranged in sequence and correspond to the three adjacent blue micro-light-emitting diodes respectively. The multiple quantum dot walls are arranged on the side of the multiple encapsulation walls facing away from the driving substrate. The quantum dot encapsulation layer is arranged on the side of the quantum dot wall facing away from the encapsulation wall and covers the red quantum dots, the green quantum dots and the scattering particles.

[0013] A plurality of red pigment particles are further provided in the electrophoresis pool corresponding to the red quantum dots; and / or a plurality of green pigment particles are further provided in the electrophoresis pool corresponding to the green quantum dots.

[0014] The present invention also provides a method for manufacturing a display panel, the method comprising the following steps:

[0015] Providing a driving substrate, wherein a plurality of sub-pixel areas distributed in an array are provided on the driving substrate;

[0016] preparing a light-emitting layer on the driving substrate;

[0017] preparing a color conversion layer on the light-emitting layer;

[0018] preparing a driving circuit layer on the color conversion layer;

[0019] A light control layer is prepared on the driving circuit layer, wherein the light control layer includes a plurality of independent electrochemical pools arranged corresponding to the sub-pixel areas of the driving substrate, the orthographic projection of the electrochemical pool on the driving substrate covers the corresponding sub-pixel areas, a plurality of charged particles are arranged in the electrochemical pool, and the plurality of charged particles can cover the corresponding sub-pixel areas after being flattened in sequence along the horizontal direction, and absorb external ambient light so that the corresponding sub-pixel areas display a dark state; the charged particles can move to one side of the electrochemical pool under the action of the electric field of the driving circuit layer, so that the corresponding sub-pixel areas display a bright state.

[0020] In one embodiment, the step of preparing a driving circuit layer on the color conversion layer includes:

[0021] preparing a thin film transistor, a first electrode and a second electrode on the color conversion layer;

[0022] The step of preparing a light control layer on the driving circuit layer comprises:

[0023] Preparing a barrier wall between the first electrode and the second electrode on the driving circuit layer, and filling a plurality of charged particles between two adjacent barrier walls;

[0024] A light encapsulation layer is prepared on the retaining wall, and the light encapsulation layer covers the charged particles.

[0025] The step of preparing a driving circuit layer on the color conversion layer comprises:

[0026] preparing a thin film transistor, a first electrode and a second electrode on the color conversion layer;

[0027] The step of preparing a light control layer on the driving circuit layer comprises:

[0028] Preparing a barrier wall between the first electrode and the second electrode on the driving circuit layer, and filling a plurality of charged particles between two adjacent barrier walls;

[0029] A light encapsulation layer is prepared on the retaining wall, and the light encapsulation layer covers the charged particles.

[0030] The present invention also provides a display device comprising the display panel described above. The display panel provided by the present invention comprises a driving substrate, a light-emitting layer, a color conversion layer, a driving circuit layer, and a light control layer, which are sequentially stacked. The driving substrate is provided with a plurality of sub-pixel regions arranged in an array. The light control layer comprises a plurality of independent electrophoretic cells corresponding to the sub-pixel regions. The orthographic projections of the electrophoretic cells on the driving substrate cover the corresponding sub-pixel regions. A plurality of charged particles are disposed within the electrophoretic cells. When the driving circuit layer is free of an electric field, the plurality of charged particles are horizontally flattened to cover the corresponding sub-pixel regions and absorb ambient light, causing the corresponding sub-pixel regions to display a dark state. When the driving circuit layer is subjected to an electric field, the charged particles are moved to one side of the electrophoretic cell under the action of the electric field, causing the corresponding sub-pixel region to display a bright state (i.e., normal display). When the display is bright, light emitted by the light-emitting layer is converted into corresponding colored light after passing through the color conversion layer and then passes through the light control layer, achieving the purpose of color display. Compared with the solution of laminating a 1 / 4 wavelength circular polarizer in the prior art, the technical solution provided by the present invention can improve the contrast of the display panel when displaying a dark state and improve the display brightness when displaying a bright state. At the same time, it can also reduce the overall thickness of the display panel to a certain extent, which is conducive to realizing the flexibility of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0032] Figure 1 A schematic cross-sectional view of a display panel according to an embodiment of the present invention in a dark state;

[0033] Figure 2 A schematic cross-sectional view of a display panel according to an embodiment of the present invention in a bright state;

[0034] Figure 3 for Figure 1 Schematic diagram of the local structure;

[0035] Figure 4 This is a schematic flow chart of an embodiment of a method for manufacturing a display panel provided by the present invention.

[0036] Description of Figure Numbers:

[0037] 1. Driving substrate; 2. Light-emitting layer; 21. Blue micro-light-emitting diode; 22. Encapsulation wall; 3. Color conversion layer; 31. Red quantum dots; 32. Green quantum dots; 33. Scattering particles; 34. Quantum dot wall; 35. Quantum dot encapsulation layer; 4. Driving circuit layer; 41. Thin film transistor; 411. Gate; 412. Source; 413. Drain; 414. Active device; 42. Insulating layer; 43. Flat layer; 44. First electrode; 45. Second electrode; 46. Common electrode; 47. First connecting electrode; 48. Second connecting electrode; 5. Light control layer; 51. Electrochemical pool; 52. Charged particles; 53. Red pigment particles; 54. Green pigment particles; 55. Retaining wall; 56. Light encapsulation layer.

[0038] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] In existing technology, when ambient light strikes the LED electrodes of a Micro-LED display panel, it reflects the ambient light, significantly reducing the contrast of the display product and affecting the image quality. To address this issue, a commonly used method is to attach a 1 / 4 wavelength circular polarizer to the outside of the product to absorb ambient light and improve the product's contrast. However, this method also absorbs the light emitted by the product itself, significantly reducing the product's brightness.

[0043] To solve the above problems, the present invention proposes a display panel that aims to improve the contrast and brightness of the display panel. The display panel provided by the present invention is a Micro-LED display panel.

[0044] See also Figure 1 and Figure 2 In one embodiment of the present invention, a display panel includes a driving substrate 1, a light-emitting layer 2, a color conversion layer 3, a driving circuit layer 4, and a light control layer 5, which are stacked in sequence. The driving substrate 1 is provided with a plurality of sub-pixel areas arranged in an array. The light control layer 5 includes a plurality of independent electrochemical pools 51 corresponding to the sub-pixel areas. The orthographic projections of the electrochemical pools 51 on the driving substrate 1 cover the corresponding sub-pixel areas. A plurality of charged particles 52 are provided in the electrochemical pools 51. The plurality of charged particles 52 are laid out in sequence in a horizontal direction to cover the corresponding sub-pixel areas and absorb ambient light to cause the corresponding sub-pixel areas to display a dark state. The charged particles 52 can move to one side of the electrochemical pool 51 under the action of the electric field of the driving circuit layer 4, causing the corresponding sub-pixel areas to display a bright state.

[0045] The driver substrate 1 is a core component of the display panel, integrated with a driver circuit (not shown) for driving the display panel. Specifically, the driver substrate 1 can be a CMOS (Complementary Metal Oxide Semiconductor) driver substrate 1 or a TFT (Thin Film Transistor) driver substrate 1. The driver substrate 1 is provided with a plurality of sub-pixel regions arranged in an array, with pixel walls separating adjacent sub-pixel regions.

[0046] The light-emitting layer 2 is mainly composed of a micro light-emitting diode (Micro-LED) chip. The specific structure and composition thereof can be referred to the prior art and will not be described in detail here.

[0047] The color conversion layer 3 is a functional layer that can convert light of a specific wavelength into light of other wavelengths. It is composed of materials that can absorb photons and re-emit photons of different wavelengths, such as quantum dot materials or phosphor materials based on blue light Micro-LEDs.

[0048] The function of the driving circuit layer 4 is to control whether the corresponding sub-pixel area in the light control layer 5 emits light. Optionally, the driving circuit layer 4 includes a TET for controlling the switch of the light control layer 5 and a pixel electrode and a common electrode 46 for providing a driving pixel voltage. The pixel electrode and the common electrode 46 are designed in the same layer in the horizontal direction. When there is a voltage difference between the pixel electrode and the common electrode 46, a horizontal electric field can be formed to drive the charged particles 52 in the light control layer 5 to move.

[0049] The light control layer 5 includes a plurality of electrophoretic pools 51 that are spaced apart and independent of each other. The electrophoretic pools 51 are arranged corresponding to the sub-pixel areas, and the orthographic projection of the electrophoretic pools 51 on the driving substrate 1 covers the corresponding sub-pixel areas. That is, in the horizontal direction, the size of the electrophoretic pools 51 is larger than the size of the corresponding sub-pixel areas. The number of charged particles 52 can be determined based on the horizontal size of the sub-pixel areas to ensure that the charged particles 52 can cover the corresponding sub-pixel areas after being flattened in the horizontal direction. In this way, when exposed to ambient light, the charged particles 52 can absorb the ambient light, causing the display panel to display a dark state. The charged particles 52 can be positively or negatively charged, which is not limited here. The charged particles 52 can be black charged particles 52 or other dark charged particles 52.

[0050] It should be noted that the horizontal size of the electrophoresis pool 51 depends on the number of charged particles 52. Specifically, it is necessary to ensure that when the charged particles 52 move to one side of the electrophoresis pool 51, the positive projection of the charged particles 52 on the driving substrate 1 is located outside the corresponding sub-pixel area.

[0051] In the dark state, the driving circuit layer 4 does not generate an electric field. At this time, the charged particles 52 are laid out in the horizontal direction and cover the corresponding sub-pixel area. The sub-pixel area is completely dark, that is, the sub-pixel area is in the off state, which can effectively absorb the external ambient light.

[0052] In the bright state, when the driving circuit layer 4 generates an electric field (optionally a horizontal electric field), the charged particles 52 are moved to one side of the electrophoretic pool 51 under the influence of this electric field. The orthographic projection of the charged particles 52 on the driving substrate 1 is outside the corresponding sub-pixel area. At this point, the sub-pixel area appears white, i.e., the sub-pixel area is in the on state. In this state, the light-emitting layer 2, driven by the driving substrate 1, emits light (optionally blue light). This light (optionally blue light) passes through the quantum dots (optionally red quantum dots 31 and / or green quantum dots 32) in the color conversion layer 3 and is converted into colored light (i.e., red light and / or green light) consistent with the color of the quantum dots. The light then passes through the light control layer 5, achieving the purpose of color display.

[0053] Compared with the solution of laminating a 1 / 4 wavelength circular polarizer in the prior art, the technical solution provided by the present invention can improve the contrast of the display panel when displaying a dark state and improve the display brightness when displaying a bright state by adding a driving circuit layer 4 and a light control layer 5 to the original structure of the display panel. At the same time, it can also reduce the overall thickness of the display panel to a certain extent, which is conducive to realizing the flexibility of the display panel.

[0054] It should be noted that the electrophoresis pool 51 is also filled with electrophoresis fluid, which is a buffer solution during the electrophoresis process. Its specific composition is not limited here and can be referred to the existing technology, so it will not be described in detail here.

[0055] Please refer again Figure 1 and Figure 2 In one embodiment of the present invention, the light control layer 5 includes a plurality of retaining walls 55 and a light encapsulation layer 56. The plurality of retaining walls 55 are arranged at intervals on the surface of the driving circuit layer 4 facing away from the color conversion layer 3. The light encapsulation layer 56 is arranged on the side of the retaining walls 55 facing away from the driving circuit layer 4. The plurality of retaining walls 55, the light encapsulation layer 56, and the driving circuit layer 4 together form a plurality of electrochemical pools 51.

[0056] The retaining wall 55 is arranged corresponding to the pixel wall, that is, the retaining wall 55 is arranged corresponding to the interval between two adjacent sub-pixel areas, and the horizontal dimension between the two adjacent retaining walls 55 is larger than the horizontal dimension of the corresponding sub-pixel area, that is, the area between the positive projections of the two adjacent retaining walls 55 on the driving substrate 1 covers the corresponding sub-pixel area.

[0057] The optical encapsulation layer 56 protects the internal structure and improves stability and reliability. The material of the optical encapsulation layer 56 can be organic, inorganic, or composite materials, and the specific material is not limited here. The optical encapsulation layer 56 is disposed on the side of the retaining wall 55 facing away from the driving circuit layer 4. The retaining walls 55, the optical encapsulation layer 56, and the driving circuit layer 4 together form a plurality of electrochemical cells 51.

[0058] In the embodiment of the present invention, the light control layer 5 has a simple structure and can realize dark and bright state display in the sub-pixel area. In the dark state, it can absorb external ambient light to improve contrast; in the bright state, it can increase display brightness. At the same time, the light control layer 5 itself is relatively thin, which can reduce the overall thickness of the display panel to a certain extent, facilitating the flexibility of the display panel.

[0059] See also Figures 1 to 3 In one embodiment of the present invention, the driving circuit layer 4 includes an electrically connected driving switch, a first electrode 44, and a second electrode 45 corresponding to the interval between two adjacent sub-pixel areas. The first electrode 44 and the second electrode 45 are relatively arranged on both sides of the bottom of the electrochemical pool 51 to form a horizontal electric field. Under the action of the horizontal electric field, the charged particles 52 can move horizontally to one side of the electrochemical pool 51.

[0060] Specifically, the driving circuit layer 4 includes a plurality of spaced driving switches, a plurality of spaced first electrodes 44 and a plurality of spaced second electrodes 45, wherein an adjacent driving switch, a first electrode 44 and a second electrode 45 form a group and are arranged corresponding to the pixel wall. The first electrode 44 and the second electrode 45 are relatively arranged on both sides of the bottom of the electrochemical pool 51. Since the bottom of the electrochemical pool 51 is horizontal, the first electrode 44 and the second electrode 45 are arranged in the same layer in the horizontal direction. When there is a voltage difference between the first electrode 44 and the second electrode 45, a horizontal electric field can be formed. The horizontal electric field can drive the charged particles 52 in the corresponding electrochemical pool 51 to move horizontally to one side of the electrochemical pool 51, so that the sub-pixel area displays a bright state.

[0061] The driving switch is a thin film transistor 41, and the first electrode 44 or the second electrode 45 is a pixel electrode. In this embodiment, the first electrode 44 is a pixel electrode, and the position of the first electrode 44 corresponds to the position of the thin film transistor 41. That is, the orthographic projection of one first electrode 44 on the driving substrate 1 at least partially overlaps with the orthographic projection of one thin film transistor 41 on the driving substrate 1. The driving circuit layer 4 also includes an insulating layer 42. The thin film transistor 41 includes a gate 411, a source 412, a drain 413, and an active device 414. The insulating layer 42 is disposed on the surface of the color conversion layer 3 facing away from the light-emitting layer 2 and covers the gate 411. The source 412, drain 413, and active device 414 are disposed on the surface of the insulating layer 42 facing away from the color conversion layer 3.

[0062] The driving circuit layer 4 also includes a plurality of common electrodes 46, which are spaced apart on the surface of the insulating layer 42 facing away from the color conversion layer 3. One common electrode 46 corresponds to the position of one second electrode 45, that is, the orthographic projection of the common electrode 46 on the driving substrate 1 at least partially overlaps with the orthographic projection of the corresponding second electrode 45 on the driving substrate 1.

[0063] The driving circuit layer 4 further includes a planar layer 43 . The planar layer 43 is disposed on a surface of the insulating layer 42 facing away from the color conversion layer 3 and covers the source 412 , the drain 413 , the active element 414 and the common electrode 46 .

[0064] A first via hole is opened in the flat layer 43 corresponding to the drain 413, and part of the drain 413 is exposed by the first via hole. A first connecting electrode 47 is arranged in the first via hole. Thus, the orthographic projection of the first electrode 44 on the driving substrate 1 and the orthographic projection of the corresponding first connecting electrode 47 on the driving substrate 1 at least partially overlap and are at least partially in contact, that is, the first electrode 44 is electrically connected to the drain 413 through the first connecting electrode 47.

[0065] A second via hole is provided in the flat layer 43 at a position corresponding to the common electrode 46 , and the position of the second via hole also corresponds one-to-one with the position of the second electrode 45 , that is, the orthographic projection of the second via hole on the driving substrate 1 at least partially overlaps with the orthographic projection of the second electrode 45 on the driving substrate 1 , and part of the common electrode 46 is exposed by the second via hole. A second connecting electrode 48 is provided in the second via hole, thereby, the second electrode 45 contacts and is electrically conductive with the second connecting electrode 48 , that is, the second electrode 45 is electrically connected to the common electrode 46 through the second connecting electrode 48 .

[0066] The driving circuit layer 4 provided in the embodiment of the present invention has a simple structure and can control whether the corresponding sub-pixel area in the light control layer 5 emits light. At the same time, the thickness of the driving circuit layer 4 and the light control layer 5 themselves is relatively small, which can reduce the overall thickness of the display panel to a certain extent, which is conducive to realizing the flexibility of the display panel.

[0067] Please refer again Figure 1 and Figure 2 In one embodiment of the present invention, the light-emitting layer 2 includes a plurality of blue micro-LEDs 21 and a plurality of packaging walls 22. The plurality of blue micro-LEDs 21 are fixed at intervals on the surface of the driving substrate 1 and are electrically connected to the driving substrate 1. Each blue micro-LED 21 is arranged corresponding to a sub-pixel area, and each packaging wall 22 is arranged between two adjacent blue micro-LEDs 21.

[0068] Specifically, the blue micro-light emitting diodes 21 (i.e., blue Micro LEDs) are distributed in an array and fixed on the surface of the driving substrate 1. For example, the two electrodes of the blue Micro LEDs are welded and fixed to two corresponding welding points on the surface of the driving substrate 1, thereby achieving electrical connection between the blue Micro LEDs and the driving substrate 1. The position of a blue Micro LED corresponds to a sub-pixel area, and the orthographic projection of the blue Micro LED on the driving substrate 1 coincides with the corresponding sub-pixel area. The encapsulation wall 22 is located between two adjacent blue Micro LEDs, that is, the encapsulation wall 22 is arranged corresponding to the pixel wall. In the embodiment of the present invention, the light-emitting layer 2 has a simple structure, wherein the blue Micro LED can emit blue light under the drive of the driving substrate 1.

[0069] Please refer again Figure 1 and Figure 2 In one embodiment of the present invention, the color conversion layer 3 includes a plurality of red quantum dots 31, a plurality of green quantum dots 32, a plurality of scattering particles 33, a plurality of quantum dot walls 34, and a quantum dot encapsulation layer 35. The red quantum dots 31, the green quantum dots 32, and the scattering particles 33 are arranged in sequence and correspond to three adjacent blue micro-light-emitting diodes 21, respectively. The plurality of quantum dot walls 34 are correspondingly arranged on the side of the plurality of encapsulation walls 22 facing away from the driving substrate 1. The quantum dot encapsulation layer 35 is arranged on the side of the quantum dot wall 34 facing away from the encapsulation wall 22, and covers the red quantum dots 31, the green quantum dots 32, and the scattering particles 33.

[0070] Specifically, the red quantum dots 31, the green quantum dots 32, and the scattering particles 33 are arranged in sequence and distributed corresponding to the three adjacent blue Micro LEDs. The orthographic projections of the red quantum dots 31, the green quantum dots 32, and the scattering particles 33 on the driving substrate 1 all coincide with the orthographic projections of the corresponding blue Micro LEDs on the driving substrate 1. The quantum dot wall 34 is located between two adjacent quantum dots, that is, the quantum dot wall 34 is arranged corresponding to the packaging wall 22, and the orthographic projection of the quantum dot wall 34 on the driving substrate 1 coincides with the orthographic projection of the packaging wall 22 on the driving substrate 1.

[0071] It should be noted that quantum dots are nanoscale semiconductor crystals with a unique quantum confinement effect. When blue light shines on the quantum dot material, the electrons within the quantum dots absorb the energy of the blue photons and transition from a low energy level to a high energy level. Due to the different sizes and compositions of the quantum dots, the energy released by the electrons when they fall back from a high energy level to a low energy level is also different, thereby emitting light of different wavelengths, such as red or green light. The red quantum dots 31 are relatively large in size and can emit red light, while the green quantum dots 32 are relatively small in size and can emit green light. The specific material composition of the red quantum dots 31 and the green quantum dots 32 is not limited, as long as they can emit light of the corresponding color. That is, blue light is absorbed and converted by the red quantum dots 31 to emit red light, and blue light is absorbed and converted by the green quantum dots 32 to emit green light. Scattering particles 33 can change the direction of light propagation, thereby expanding the light's angle of emission. Specifically, after passing through scattering particles 33, the blue light's direction of propagation changes and its angle of emission widens, resulting in a more uniform light distribution. This allows users to experience consistent brightness and color when viewing the display from different angles, effectively expanding the viewing angle of the display. Scattering particles 33 include, but are not limited to, titanium dioxide particles and silicon dioxide particles.

[0072] Of course, in some other embodiments, scattering particles 33 are further added to the red quantum dots 31 and / or the green quantum dots 32, and the amount of scattering particles 33 added can be selected to be 3wt%-5wt%. This can effectively expand the viewing angle of the corresponding sub-pixel area, that is, effectively expand the viewing angle of the display panel as a whole, and improve the overall brightness and color consistency.

[0073] The color conversion layer 3 provided in the embodiment of the present invention has a relatively simple structure and can convert the blue light emitted by the light-emitting layer 2 into corresponding red light / green light, or expand the emission angle of the blue light, thereby effectively expanding the viewing angle of the entire display panel, and the overall brightness and color consistency are good.

[0074] Please refer again Figure 1 and Figure 2 In one embodiment of the present invention, a plurality of red pigment particles 53 are further disposed in the electrophoretic pool 51 corresponding to the red quantum dots 31 .

[0075] The red pigment particles 53 can absorb the blue light that is not completely absorbed by the red quantum dots 31, thereby achieving better consistency of the red light emitted through the color conversion layer 3, avoiding the phenomenon of mixing of red and blue light, and ensuring better color consistency of the displayed image.

[0076] It should be noted that the number of red pigment particles 53 is determined by the size of the electrophoretic cell 51 to ensure that the red pigment particles 53 can cover the corresponding sub-pixel area after being flattened in the horizontal direction. That is, the orthographic projection of the red pigment particles 53 on the driving substrate 1 after being flattened in the horizontal direction completely covers the corresponding sub-pixel area, thereby ensuring that the blue light emitted by the blue Micro LED located in the sub-pixel area can be completely absorbed by the corresponding red quantum dots 31 and red pigment particles 53, avoiding color mixing and improving the color consistency of the display.

[0077] Please refer again Figure 1 and Figure 2 In one embodiment of the present invention, a plurality of green pigment particles 54 are further disposed in the electrophoretic pool 51 corresponding to the green quantum dots 32 .

[0078] The green pigment particles 54 can absorb the blue light that is not completely absorbed by the green quantum dots 32, thereby achieving better consistency of the green light emitted through the color conversion layer 3, avoiding the phenomenon of mixing of green light and blue light, and ensuring better color consistency of the displayed image.

[0079] It should be noted that the number of green pigment particles 54 is determined by the size of the electrophoretic cell 51 to ensure that the green pigment particles 54 can cover the corresponding sub-pixel area after being flattened in the horizontal direction. That is, the orthographic projection of the green pigment particles 54 on the driving substrate 1 after being flattened in the horizontal direction completely covers the corresponding sub-pixel area, thereby ensuring that the blue light emitted by the blue Micro LED located in the sub-pixel area can be completely absorbed by the corresponding green quantum dots 32 and green pigment particles 54, avoiding color mixing and improving the color consistency of the display image.

[0080] In the display panel provided by the present invention, the thickness of each layer is not specifically limited, and the specific material is not limited either, and all are within the protection scope of the present invention.

[0081] See also Figure 4 The present invention also provides a method for preparing a display panel, comprising the following steps:

[0082] Step S1 : providing a driving substrate 1 , wherein a plurality of sub-pixel areas distributed in an array are provided on the driving substrate 1 .

[0083] The driving substrate 1 may be a TFT driving substrate 1, and its specific preparation steps may refer to the prior art and will not be described in detail here. The prepared driving substrate 1 is provided with a plurality of sub-pixel areas distributed in an array, and two adjacent sub-pixel areas are separated by pixel walls.

[0084] Step S2 , preparing a light-emitting layer 2 on the driving substrate 1 .

[0085] Specifically, a blue Micro LED is fixed at the corresponding sub-pixel area on the driving substrate 1, and the two electrodes of the blue Micro LED are welded and fixed to the two corresponding welding points on the surface of the driving substrate 1; then, a packaging wall 22 is prepared between two adjacent blue Micro LEDs, and the height of the packaging wall 22 is flush with the height of the blue Micro LED, thereby completing the preparation of the light-emitting layer 2.

[0086] Step S3 , preparing a color conversion layer 3 on the light-emitting layer 2 .

[0087] Specifically, quantum dot walls 34 are formed on the light-emitting layer 2 corresponding to the encapsulation walls 22. The orthographic projection of the quantum dot walls 34 on the driver substrate 1 coincides with the orthographic projection of the encapsulation walls 22 on the driver substrate 1. Red quantum dots 31, green quantum dots 32, and scattering particles 33 are sequentially formed between two adjacent quantum dot walls 34. That is, the red quantum dots 31, green quantum dots 32, and scattering particles 33 are sequentially arranged corresponding to three adjacent Micro LEDs, and the orthographic projections of the red quantum dots 31, green quantum dots 32, and scattering particles 33 on the driver substrate 1 all coincide with the orthographic projections of the corresponding blue Micro LEDs on the driver substrate 1. The red quantum dots 31, green quantum dots 32, scattering particles 33, and quantum dot walls 34 are all formed to the same thickness. Next, a quantum dot encapsulation layer 35 is formed on the quantum dot walls 34, covering the quantum dot walls 34, red quantum dots 31, green quantum dots 32, and scattering particles 33. This completes the preparation of the color conversion layer 3.

[0088] It should be noted that in order to effectively expand the viewing angle of the display panel as a whole and achieve better overall brightness and color consistency, scattering particles 33 are also added to the red quantum dots 31 and / or the green quantum dots 32. The amount of scattering particles 33 added can refer to the above embodiments and will not be repeated here.

[0089] Step S4 , preparing a driving circuit layer 4 on the color conversion layer 3 .

[0090] Specifically, a thin film transistor 41 is prepared on the quantum dot encapsulation layer 35. First, a gate 411 is prepared on the quantum dot encapsulation layer 35. Then, an insulating layer 42 is prepared on the quantum dot encapsulation layer 35. The insulating layer 42 covers the gate 411. A source 412, a drain 413, an active element 414, and a common electrode 46 are prepared on the insulating layer 42 at positions corresponding to the quantum dot walls 34. Then, a flat layer 43 is prepared on the insulating layer 42. The flat layer 43 covers the source 412, the drain 413, the active element 414, and the common electrode 46. A first via hole is opened at the position corresponding to the drain electrode 413, partially exposing the drain electrode 413. A first connecting electrode 47 is then formed in the first via hole. A first electrode 44 is then formed on the planar layer 43 at a position corresponding to the first connecting electrode 47. A second via hole is opened on the planar layer 43 at a position corresponding to the common electrode 46, and a second connecting electrode 48 is formed in the second via hole. A second electrode 45 is then formed on the planar layer 43 at a position corresponding to the second connecting electrode 48. The second electrode 45 and the first electrode 44 are spaced apart and arranged on the same layer, forming a horizontal electric field between them. This completes the preparation of the drive circuit layer 4.

[0091] In step S5, a light control layer 5 is prepared on the driving circuit layer 4, wherein the light control layer 5 includes a plurality of independent electrochemical pools 51 arranged in corresponding sub-pixel areas. The orthographic projection of the electrochemical pool 51 on the driving substrate 1 covers the corresponding sub-pixel area. A plurality of charged particles 52 are arranged in the electrochemical pool 51. The plurality of charged particles 52 can cover the corresponding sub-pixel area after being flattened in sequence along the horizontal direction, and absorb external ambient light so that the corresponding sub-pixel area displays a dark state; the charged particles 52 can move to one side of the electrochemical pool 51 under the action of the electric field of the driving circuit layer 4, so that the corresponding sub-pixel area displays a bright state.

[0092] Specifically, a retaining wall 55 is prepared at the interval between the first electrode 44 and the second electrode 45 of the same thin film transistor 41 on the flat layer 43, and a plurality of charged particles 52 (optionally black charged particles 52) are filled between two adjacent retaining walls 55. The electrical properties and quantity of the charged particles 52 can be referred to the above embodiment and will not be described in detail here. Of course, an electrophoretic fluid is also filled between two adjacent retaining walls 55. The specific composition of the electrophoretic fluid can be referred to the above embodiment and will not be described in detail here. Afterwards, a light encapsulation layer 56 is prepared on the retaining wall 55. The light encapsulation layer 56, the plurality of retaining walls 55, and the flat layer 43 are enclosed together to form a plurality of electrophoretic pools 51. In this way, the preparation of the light control layer 5 can be achieved.

[0093] The display panel manufacturing method provided by the present invention simplifies the preparation of each layer, resulting in a lower overall thickness than conventional solutions using a quarter-wavelength circular polarizer, facilitating flexible display panels. Furthermore, the resulting display panel can improve contrast in dark display mode and brightness in bright display mode.

[0094] Furthermore, in some embodiments of the present invention, step S5, in the step of preparing the light control layer 5 on the driving circuit layer 4, further includes:

[0095] A plurality of red pigment particles 53 are filled between two adjacent retaining walls 55 corresponding to the red quantum dots 31 .

[0096] Specifically, after forming the retaining walls 55, a plurality of red pigment particles 53 are added between adjacent retaining walls 55 corresponding to the red quantum dots 31. The number of red pigment particles 53 can be found in the above-described embodiment and will not be detailed here. The added red pigment particles 53 absorb blue light that is not fully absorbed by the red quantum dots 31, thereby achieving a more consistent red light beam emitted from the color conversion layer 3, preventing mixing of red and blue light beams, and ensuring consistent color on the displayed image.

[0097] Furthermore, in some embodiments of the present invention, step S5, in the step of preparing the light control layer 5 on the driving circuit layer 4, further includes:

[0098] The green pigment particles 54 are filled between two adjacent retaining walls 55 corresponding to the green quantum dots 32 .

[0099] Specifically, after forming the retaining walls 55, a plurality of green pigment particles 54 are added between adjacent retaining walls 55 corresponding to the green quantum dots 32. The number of green pigment particles 54 can be referred to in the above embodiment and will not be detailed here. The added green pigment particles 54 absorb the blue light not fully absorbed by the green quantum dots 32, thereby achieving a more consistent red light beam emitted from the color conversion layer 3, preventing mixing of green and blue light beams, and ensuring a consistent color display.

[0100] The present invention further provides a display device comprising a display panel. The specific structure of the display panel is as described above. Since the present display device utilizes all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The display device provided by the present invention is a Micro-LED display device.

[0101] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A display panel, characterized in that: It includes a driving substrate, a light-emitting layer, a color conversion layer, a driving circuit layer and a light control layer stacked in sequence, wherein the driving substrate is provided with a plurality of sub-pixel areas arranged in an array; The light control layer includes a plurality of independent electrochemical cells arranged corresponding to the sub-pixel areas, wherein the orthographic projections of the electrochemical cells on the driving substrate cover the corresponding sub-pixel areas, and a plurality of charged particles are arranged in the electrochemical cells; The plurality of charged particles are laid out in sequence along the horizontal direction to cover the corresponding sub-pixel area and absorb the external ambient light, so that the corresponding sub-pixel area displays a dark state; The charged particles can move to one side of the electrochemical pool under the action of the electric field of the driving circuit layer, so that the corresponding sub-pixel area displays a bright state.

2. The display panel according to claim 1, wherein The light control layer includes a plurality of retaining walls and a light encapsulation layer. The plurality of retaining walls are arranged at intervals on the surface of the driving circuit layer facing away from the color conversion layer. The light encapsulation layer is arranged on the side of the retaining wall facing away from the driving circuit layer. The plurality of retaining walls, the light encapsulation layer and the driving circuit layer together form a plurality of the electrochemical pools.

3. The display panel according to claim 1, wherein The driving circuit layer corresponding to the interval between two adjacent sub-pixel areas includes an electrically connected driving switch, a first electrode and a second electrode. The first electrode and the second electrode are relatively arranged on both sides of the bottom of the electrophoresis pool to form a horizontal electric field. Under the action of the horizontal electric field, the charged particles can move horizontally to one side of the electrophoresis pool.

4. The display panel according to any one of claims 1 to 3, wherein: The light-emitting layer includes a plurality of blue micro-light-emitting diodes and a plurality of packaging walls. The plurality of blue micro-light-emitting diodes are fixed at intervals on the surface of the driving substrate and are electrically connected to the driving substrate. Each of the blue micro-light-emitting diodes corresponds to a sub-pixel area, and each of the packaging walls is arranged between two adjacent blue micro-light-emitting diodes.

5. The display panel according to claim 4, wherein: The color conversion layer includes multiple red quantum dots, multiple green quantum dots, multiple scattering particles, multiple quantum dot walls and a quantum dot encapsulation layer. The red quantum dots, green quantum dots and scattering particles are arranged in sequence and correspond to the three adjacent blue micro-light-emitting diodes respectively. The multiple quantum dot walls are arranged on the side of the multiple encapsulation walls facing away from the driving substrate. The quantum dot encapsulation layer is arranged on the side of the quantum dot wall facing away from the encapsulation wall and covers the red quantum dots, the green quantum dots and the scattering particles.

6. The display panel according to claim 5, wherein: A plurality of red pigment particles are further provided in the electrophoresis pool corresponding to the red quantum dots; and / or, A plurality of green pigment particles are also arranged in the electrophoresis pool corresponding to the green quantum dots.

7. A method for preparing a display panel, characterized in that: The preparation method comprises the following steps: Providing a driving substrate, wherein a plurality of sub-pixel areas distributed in an array are provided on the driving substrate; preparing a light-emitting layer on the driving substrate; preparing a color conversion layer on the light-emitting layer; preparing a driving circuit layer on the color conversion layer; A light control layer is prepared on the driving circuit layer, wherein the light control layer includes a plurality of independent electrochemical pools arranged corresponding to the sub-pixel areas of the driving substrate, the orthographic projection of the electrochemical pool on the driving substrate covers the corresponding sub-pixel areas, a plurality of charged particles are arranged in the electrochemical pool, and the plurality of charged particles can cover the corresponding sub-pixel areas after being flattened in sequence along the horizontal direction, and absorb external ambient light so that the corresponding sub-pixel areas display a dark state; the charged particles can move to one side of the electrochemical pool under the action of the electric field of the driving circuit layer, so that the corresponding sub-pixel areas display a bright state.

8. The method for manufacturing a display panel according to claim 7, wherein: The step of preparing a driving circuit layer on the color conversion layer comprises: preparing a thin film transistor, a first electrode and a second electrode on the color conversion layer; The step of preparing a light control layer on the driving circuit layer comprises: Preparing a barrier wall between the first electrode and the second electrode on the driving circuit layer, and filling a plurality of charged particles between two adjacent barrier walls; A light encapsulation layer is prepared on the retaining wall, and the light encapsulation layer covers the charged particles.

9. The method for manufacturing a display panel according to claim 7 or 8, wherein: The step of preparing a light-emitting layer on the driving substrate comprises: Fixing a blue micro light emitting diode at a corresponding sub-pixel area on the driving substrate; The step of preparing a color conversion layer on the light-emitting layer comprises: On the light-emitting layer, red quantum dots, green quantum dots and scattering particles are sequentially arranged corresponding to the three adjacent blue micro-light-emitting diodes; The step of preparing the light control layer on the driving circuit layer further includes: Filling a plurality of red pigment particles into an electrophoretic cell corresponding to the red quantum dots; and / or, A plurality of green pigment particles are filled in an electrophoresis pool corresponding to the green quantum dots.

10. A display device, characterized in that: The display device includes the display panel according to any one of claims 1 to 9.

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