Display panel, preparation method thereof and display device

Abstract

The application discloses a display panel and a preparation method thereof, and a display device. The display panel comprises a first substrate and a second substrate arranged oppositely; a pixel electrode layer located on one side of the first substrate; a common electrode layer located on a side of the second substrate facing the first substrate; a pixel isolation column located between the first substrate and the second substrate and defining a plurality of sub-pixel areas between the first and second substrates, the sub-pixel areas having black charged microspheres; and a light control component located in the sub-pixel area and configured to reflect light to the light-emitting side of the display panel. Thus, a display panel with higher display brightness and contrast can be obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular, to a display panel, a preparation method thereof and a display device. BACKGROUND

[0002] The reflective display device is a device structure for displaying by using ambient light, which can clearly display by using ambient light in strong light or weak light, and has the advantages of low driving voltage, energy saving and small damage to eyes. At present, the reflective display device can be divided into capsule type and ink type according to the material system. The capsule type reflective display device realizes black and white display through particles in the capsule. The ink type reflective display device realizes black and white display through particles in the ink. Since the ink has fluidity, the reflective micro-cup is needed in the structure of the ink type reflective display device to ensure that the sub-pixel region has a certain number of particles, so as to ensure the display effect. The reflective display device in the related art has the problems of low brightness and poor contrast ratio during display.

[0003] Therefore, the display panel, the preparation method thereof and the electronic device still need to be improved. SUMMARY

[0004] The present application aims to at least partly alleviate or solve at least one of the above mentioned problems.

[0005] In one aspect of the present application, a display panel is provided, comprising: a first substrate and a second substrate arranged oppositely; a pixel electrode layer, which is located on one side of the first substrate; a common electrode layer, which is located on the side of the second substrate facing the first substrate; a pixel isolation column, which is located between the first substrate and the second substrate and defines a plurality of sub-pixel regions between the first and second substrates, the sub-pixel region having black charged microspheres therein; a light control component, which is located in the sub-pixel region and is configured to reflect light to the light-out side of the display panel. Thus, a display panel with high display brightness and contrast ratio can be obtained.

[0006] According to an embodiment of the present application, the side of the second substrate is the light-out side, the light control component is located on the side of the first substrate facing the second substrate, the light control component comprises a reflective structure, the reflective structure comprises an insulating protrusion located on the side of the first substrate facing the second substrate, and the cross-sectional area of the insulating protrusion gradually decreases in the direction from the first substrate to the second substrate, and the side of the insulating protrusion away from the first substrate has a reflective metal. Thus, the display effect of the display panel can be further improved.

[0007] According to an embodiment of the present application, the reflective structure is at least one of a pyramid, a cone, a platform and a hemisphere. In this way, the display effect of the display panel can be further improved.

[0008] According to an embodiment of the present application, the number of edges of the pyramid and the platform is 3-8, and the angle between the edges and the bottom surface is 10-45°. In this way, the display effect of the display panel can be further improved.

[0009] According to an embodiment of the present application, the sidewall of the pixel isolation column has the reflective metal. In this way, the display effect of the display panel can be further improved.

[0010] According to an embodiment of the present application, the light control component includes an electrochromic layer, the electrochromic layer is located on the surface of the light-emitting side substrate towards the sub-pixel area side, the electrochromic layer has a transparent state and a light-absorbing state, and the orthographic projection of the electrochromic layer on the first substrate is located in the sub-pixel area. In this way, the display contrast of the display panel can be further improved.

[0011] According to an embodiment of the present application, further comprising a color resistance layer, the color resistance layer includes a plurality of color resistance blocks, the color resistance layer is located between the common electrode layer and the second substrate, the orthographic projection of the pixel isolation column on the first substrate does not coincide with the orthographic projection of the color resistance layer on the first substrate, there is a black matrix layer between adjacent color resistance blocks, and the height difference between the color resistance layer and the black matrix layer in the direction from the first substrate to the second substrate is 3-15 μm. In this way, the display effect of the display panel can be further improved.

[0012] According to an embodiment of the present application, further comprising at least one of the following structures: a first insulating layer, the first insulating layer is located on the side of the pixel electrode layer away from the first substrate, and the first insulating layer covers the pixel electrode layer; a second insulating layer, the second insulating layer is located on the side of the common electrode layer away from the second substrate, and the second insulating layer covers the common electrode layer; a first connecting electrode and a second connecting electrode, the first connecting electrode is located on the side of the first substrate and is arranged around the edge area of the first substrate; the second connecting electrode is located on the side of the second substrate and is arranged around the edge area of the second substrate, and the first connecting electrode and the second connecting electrode are electrically connected through conductive sealing frame glue. In this way, the power supply control of the display panel can be facilitated.

[0013] According to an embodiment of the present application, the orthographic projection of the pixel electrode layer on the first substrate at least partially surrounds the orthographic projection of the reflective structure on the first substrate. In this way, the display effect of the display panel can be further improved.

[0014] According to an embodiment of the present application, the orthogonal projection of the pixel electrode layer on the first substrate is a plurality of mutually connected closed figures, and the closed figures include at least one of a triangle, a circle, a rectangle, and a regular polygon. In this way, the display effect of the display panel can be further improved.

[0015] According to an embodiment of the present application, the height of the pixel isolation column is 3-15 μm, and the width of the pixel isolation column is 1-10 μm, in the direction from the first substrate to the second substrate. In this way, the display effect of the display panel can be further improved.

[0016] According to an embodiment of the present application, the sub-pixel region further includes white charged microspheres. In this way, the display contrast of the display panel can be further improved.

[0017] In another aspect of the present application, a method for manufacturing the aforementioned display panel is provided, which includes: forming a pixel electrode layer on a first substrate; forming a common electrode layer on a second substrate; forming a pixel isolation column on the first substrate and / or the second substrate to define a plurality of sub-pixel regions; disposing a light control component in the sub-pixel region; joining the first substrate and the second substrate to form a sub-pixel closed space; injecting ink into the sub-pixel closed space and performing a sealing process to obtain the display panel. The aforementioned display panel can be manufactured by the above method, and thus the method has all the features and advantages of the aforementioned display panel, which will not be described herein again.

[0018] According to an embodiment of the present application, the light control component is formed by: forming an insulating protrusion and forming a reflective metal on a side surface of the insulating protrusion facing the second substrate, wherein the pixel isolation column and the insulating protrusion are formed synchronously, and after the pixel isolation column and the insulating protrusion are formed, the reflective metal is further formed on the side wall of the pixel isolation column and the side surface of the insulating protrusion facing the second substrate. In this way, the pixel isolation column structure with the reflective metal on the surface can be obtained.

[0019] In yet another aspect of the present application, a display device is provided, which has the aforementioned display panel. In this way, the display device has all the features and advantages of the aforementioned display panel, which will not be described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0021] Figure 1 A structural schematic diagram of a display panel according to an embodiment of the present application is shown;

[0022] Figure 2 Fig. 4 shows a structural schematic diagram of a display panel according to another embodiment of the present application;

[0023] Figure 3 Fig. 5 shows a principle diagram of bright state display of a display panel according to an embodiment of the present application;

[0024] Figure 4 Fig. 6 shows a principle diagram of dark state display of a display panel according to an embodiment of the present application;

[0025] Figure 5 Fig. 7 shows a principle diagram of bright state display of a display panel according to another embodiment of the present application;

[0026] Figure 6 Fig. 8 shows a principle diagram of dark state display of a display panel according to another embodiment of the present application;

[0027] Figure 7 Fig. 9 shows a structural schematic diagram of a first substrate according to an embodiment of the present application;

[0028] Figure 8 Fig. 10 shows a structural schematic diagram of a second substrate according to an embodiment of the present application;

[0029] Figure 9 Fig. 11 shows a schematic diagram of arrangement of a sub-electrode and a reflecting structure in a sub-pixel region according to an embodiment of the present application;

[0030] Figure 10 Fig. 12 shows a schematic diagram of arrangement of a sub-electrode and a reflecting structure in a sub-pixel region according to another embodiment of the present application;

[0031] Figure 11 Fig. 13 shows a schematic diagram of arrangement of a sub-electrode and a reflecting structure in a sub-pixel region according to another embodiment of the present application;

[0032] Figure 12 Fig. 14 shows a schematic diagram of arrangement of a sub-electrode and a reflecting structure in a sub-pixel region according to another embodiment of the present application;

[0033] Figure 13 Fig. 15 shows a schematic diagram of arrangement of a sub-electrode and a reflecting structure in a sub-pixel region according to another embodiment of the present application;

[0034] Figure 14 Fig. 16 shows a schematic diagram of arrangement of a sub-electrode and a reflecting structure in a sub-pixel region according to another embodiment of the present application;

[0035] Figure 15 Fig. 17 shows a schematic diagram of arrangement of a sub-electrode and a reflecting structure in a sub-pixel region according to another embodiment of the present application;

[0036] Figure 16A scanning electron microscope image showing the arrangement of reflective structures in a sub-pixel region according to an embodiment of the present application;

[0037] Figure 17 A schematic diagram showing the principle of bright state display of a display panel according to another embodiment of the present application;

[0038] Figure 18 A schematic diagram showing the principle of dark state display of a display panel according to another embodiment of the present application;

[0039] Figure 19 A schematic diagram showing the principle of color display of a display panel according to an embodiment of the present application;

[0040] Figure 20 A schematic diagram showing the principle of bright state display of a display panel according to another embodiment of the present application;

[0041] Figure 21 A schematic diagram showing the principle of dark state display of a display panel according to another embodiment of the present application;

[0042] Figure 22 A schematic diagram showing part of a method of manufacturing a display panel according to an embodiment of the present application;

[0043] Figure 23 A schematic diagram showing part of a method of manufacturing a display panel according to another embodiment of the present application; Figure 22 A schematic diagram showing part of a method of manufacturing a display panel according to another embodiment of the present application;

[0044] Figure 24 A schematic diagram showing part of a method of manufacturing a display panel according to another embodiment of the present application;

[0045] Figure 25 A schematic diagram showing part of a method of manufacturing a display panel according to another embodiment of the present application;

[0046] Figure 26 A schematic diagram showing part of a method of manufacturing a display panel according to another embodiment of the present application; Figure 25 A schematic diagram showing part of a method of manufacturing a display panel according to another embodiment of the present application;

[0047] BRIEF DESCRIPTION OF DRAWINGS

[0048] 10: black charged microspheres; 20: white charged microspheres; 100: first substrate; 110: pixel electrode layer; 101: first connecting electrode; 200: second substrate; 210: common electrode layer; 201: second connecting electrode; 212: electrochromic layer; 213: color resist layer; 214: black matrix layer; 300: pixel isolation column; 400: light control component; 410: insulating protrusion; 420: reflective metal. DETAILED DESCRIPTION

[0049] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters throughout the figures denote the same or like elements or elements having the same or similar functions. The embodiments described below are exemplary and are not intended to be limiting of the present application.

[0050] In one aspect of the present application, with reference to Figure 1 , the present application proposes a display panel, comprising: a first substrate 100 and a second substrate 200 arranged oppositely; a pixel electrode layer 110, the pixel electrode layer 110 being located on one side of the first substrate 100; a common electrode layer 210, the common electrode layer 210 being located on the side of the second substrate 200 facing the first substrate 100; a pixel isolation column 300, the pixel isolation column 300 being located between the first substrate 100 and the second substrate 200 and defining a plurality of sub-pixel regions between the first substrate 100 and the second substrate 200, the sub-pixel region having a black charged microsphere 10 therein; a light control component 400, the light control component 400 being located in the sub-pixel region, and the light control component 400 being configured to reflect light rays toward the light-emitting side of the display panel, so that a display panel with higher display brightness and contrast can be obtained.

[0051] According to some embodiments of the present application, the structure of the light control component is not particularly limited, for example, with reference to Figure 2 , taking the side of the second substrate 200 as the light-emitting side, the light control component is located on the side of the first substrate 100 facing the second substrate 200, the light control component comprises a reflective structure, the reflective structure comprises an insulating protrusion 410 located on the side of the first substrate 100 facing the second substrate 200, and the cross-sectional area of the insulating protrusion 410 gradually decreases from the direction of the first substrate 100 to the second substrate 200, and the side of the insulating protrusion 410 away from the first substrate 100 has a reflective metal 420, so that a reflective display device with higher display brightness and contrast can be obtained.

[0052] For ease of understanding, the principle of the display panel in the present application having the above beneficial effects is described below:

[0053] With reference to Figure 3 , when a voltage attracting the black charged microspheres is applied to the pixel electrode layer 110 and a common voltage is applied to the common electrode layer 210, the black charged microspheres move and are adsorbed in the gap between the adjacent reflective structures on the side close to the first substrate 100, so that the incident ambient light (such as Figure 3 indicated by the solid arrows in the figure) is reflected between the reflective metals 420 on the adjacent reflective structures (such as Figure 3 indicated by the dashed arrows in the figure), and finally escapes from the light-emitting side, the display panel presents a bright state; with reference to Figure 4When a voltage that repels and attracts the black charged microspheres is applied to the pixel electrode layer 110, and a common voltage is applied to the common electrode layer 210, the black charged microspheres 10 move to the surface of the sub-pixel region near the second substrate 200, and are exposed to ambient light (such as...). Figure 4 (As indicated by the solid arrow) is absorbed by the black charged microspheres 10, with no reflected light escaping, resulting in a dark display panel. By controlling the voltage applied to the pixel electrode layer 110 and the common electrode layer, the position of the black charged microspheres 10 within the sub-pixel region can be controlled, thereby controlling the bright and dark states of the sub-pixels, and ultimately achieving bright and dark display states for the display panel.

[0054] According to some embodiments of the present invention, the material forming the reflective metal is not particularly limited. For example, when the reflectivity of the material forming the reflective metal is not less than 80%, the reflective metal has a good reflective effect. Specifically, the material of the reflective metal may include high reflectivity metals such as Ag, Al and Cu.

[0055] According to some embodiments of the present invention, the shape of the reflective structure is not particularly limited, for example, referring to Figures 9-16 The reflective structure may include at least one of a pyramid, a cone, a frustum, and a hemisphere. Furthermore, when the reflective structure is a pyramid or a frustum, the number of edges of the pyramid or frustum can be 3-8, and the angle between the edges and the base can be 10-45°. This reduces the number of reflections of the incident light between the reflective metals, allowing it to escape from the light-emitting side after fewer reflections, thereby reducing energy loss and improving the display brightness of the display panel.

[0056] According to some embodiments of the present invention, the placement of the reflective metal is not particularly limited, for example, referring to Figure 5 and Figure 6 The sidewalls of the pixel isolation pillar 300 may have reflective metal 420. Specifically, refer to... Figure 5 When a voltage is applied to the pixel electrode layer 110 to attract the black charged microspheres, and a common voltage is applied to the common electrode layer 210, the black charged microspheres 10 move and adhere to the gap between adjacent reflective structures near the first substrate 100, so that incident ambient light (such as...) Figure 5 (As shown by the solid arrow) Reflection occurs between the reflective metal 420 on adjacent reflective structures, and between the reflective metal 420 of the reflective structure and the reflective metal 420 on the sidewall of the pixel isolation pillar 300 (e.g.) Figure 5 (As indicated by the dashed arrow in the middle), the light eventually escapes from the emitting side, and the display panel becomes bright; Reference Figure 6 When a voltage is applied to the pixel electrode layer 110 to repel and attract the black charged microspheres, and a common voltage is applied to the common electrode layer 210, the black charged microspheres 10 move and adhere to the surface near the second substrate 200 in the sub-pixel region, where ambient light (such as...) is incident.Figure 6 When the black charged microspheres 10 are attracted to the pixel electrode layer 110, the display panel presents a dark state. By controlling the voltage applied to the pixel electrode layer 110 and the common electrode layer, the position of the black charged microspheres 10 in the sub-pixel region can be controlled, thereby controlling the bright state and the dark state of the sub-pixel, and further realizing the bright state display and the dark state display of the display panel.

[0057] According to some embodiments of the present application, the structure of the light control assembly is not particularly limited, for example, the light control assembly can further include an electrochromic layer 212 located on the surface of the light-emitting side substrate facing the sub-pixel region, the electrochromic layer 212 has a transparent state and an absorbing state, and the orthographic projection of the electrochromic layer 212 on the first substrate is located in the sub-pixel region, so that the contrast of the display panel can be further improved by the setting of the electrochromic layer. Specifically, referring to Figure 17 When the voltage attracting the black charged microspheres is applied to the pixel electrode layer 110, and the common voltage is applied to the common electrode layer 210, at this time the electrochromic layer 212 is in the transparent state, the black charged microspheres 10 move and are adsorbed in the gap between the adjacent reflective structures close to the first substrate 100 side, so that the incident ambient light (such as Figure 17 The middle solid arrow indicates that the reflection of the ambient light (such as Figure 17 The middle dotted arrow indicates that the ambient light is finally emitted from the light-emitting side, and the display panel presents a bright state; referring to Figure 18 When the voltage repelling the black charged microspheres is applied to the pixel electrode layer 110, and the common voltage is applied to the common electrode layer 210, at this time the electrochromic layer is in the absorbing state, the black charged microspheres 10 move and are adsorbed on the surface close to the second substrate 200 side in the sub-pixel region, the incident ambient light (such as Figure 18 The middle solid arrow indicates that the ambient light is absorbed by the electrochromic layer 212, and the ambient light that is not completely absorbed is secondarily absorbed by the black charged microspheres 10, no reflected light escapes, and the display panel presents a dark state, so that the dark state brightness of the display panel can be further reduced, and the display contrast of the display panel can be effectively improved. By setting the electrochromic layer, the dark state brightness of the display panel can be significantly reduced, achieving the effect of contrast improvement.

[0058] According to some embodiments of the present application, the structure of the display panel is not particularly limited, for example, referring to Figure 19 and Figure 25In (b) of the above, the display panel can further include a color resist layer 213, the color resist layer 213 can include a plurality of color resist blocks, the color resist layer 213 is located between the common electrode layer 210 and the second substrate 200, the orthographic projection of the pixel isolation column 300 on the first substrate 100 does not coincide with the orthographic projection of the color resist layer 213 on the first substrate 100, there is a black matrix layer 214 between adjacent color resist blocks, the height difference between the color resist layer 213 and the black matrix layer 214 in the direction from the first substrate 100 to the second substrate 200 can be 3-15 μm, that is, a groove structure is formed at the black matrix layer 214, which can be used as a positioning groove to complete the alignment and compression of the pixel isolation column in the bonding process of the first substrate and the second substrate. Specifically, when the display panel includes the color resist layer 213, referring to Figure 19 When a voltage attracting the black charged microspheres is applied to the pixel electrode layer 110 and a common voltage is applied to the common electrode layer 210, the black charged microspheres 10 move and are adsorbed in the gap between the adjacent reflection structures close to the side of the first substrate 100, so that the incident ambient light (such as Figure 19 indicated by the solid arrows in (b)) is reflected between the reflection metals 420 on the adjacent reflection structures and between the reflection metal 420 of the reflection structure and the reflection metal 420 on the side wall of the pixel isolation column 300 (such as Figure 19 indicated by the dashed arrows in (b)), and finally escapes from the light-emitting side, and the display panel presents a bright state; at this time, since the ambient light passes through the color resist block in the optical path of the light incident into the display panel and the light emitted from the display panel, for example, when the incident light passes through the red color resist block, it is filtered into red light, so after being emitted from the sub-pixel region, it also presents red light, that is, the sub-pixel presents the color of the color resist block it has. It can be understood that when the color resist blocks with different colors are provided in the plurality of sub-pixel regions, the sub-pixel can present different colors, and through the cooperation of color resist blocks with multiple colors, sub-pixels with multiple colors can be realized, so as to realize the color display of the display panel.

[0059] According to some embodiments of the present application, the structure of the display panel is not particularly limited, for example, referring to Figure 7 and Figure 8The display panel can further include: a first connecting electrode 101 and a second connecting electrode 201, the first connecting electrode 101 is located on the side of the first substrate 100 and is arranged around the edge region of the first substrate 100; the second connecting electrode 201 is located on the side of the second substrate 200 and is arranged around the edge region of the second substrate 200, the first connecting electrode 101 and the second connecting electrode 201 are electrically connected through the conductive sealing frame glue, so that the pixel electrode layer 110 and the common electrode layer 210 of the display panel can be conveniently controlled to be powered. Specifically, the sealing frame glue with conductive gold balls can be used to electrically connect the first connecting electrode 101 on the first substrate 100 and the second connecting electrode 201 on the second substrate 200, and then the pixel electrode layer 110 and the common electrode layer 210 can be controlled to be powered through the preset driving circuit structure on the first substrate 100.

[0060] According to some embodiments of the present application, the structure of the display panel is not particularly limited, for example, referring to Figures 5-6 , and Figures 17-21 The display panel can include a first insulating layer 111, the first insulating layer 111 is located on the side of the pixel electrode layer 110 away from the first substrate 110, and the first insulating layer 111 covers the pixel electrode layer 110. The first insulating layer can be used to prevent the electrodes of the pixel electrode layer from directly contacting the polarized black charged microspheres in the ink, thereby avoiding the failure of the polarized black charged microspheres.

[0061] It can be understood that the pixel electrode layer 110 can be in direct contact with the first substrate 100 to achieve electrical connection; there can also be other film layers between the pixel electrode layer 110 and the first substrate 100, at this time the pixel electrode layer can be electrically connected with the first substrate by forming a through hole on the other film layer and filling a conductive material in the through hole.

[0062] According to some embodiments of the present application, the structure of the display panel is not particularly limited, for example, the common electrode layer can further have a second insulating layer on the side away from the second substrate, the second insulating layer can be used to prevent the electrodes of the common electrode layer from directly contacting the polarized black charged microspheres in the ink, thereby avoiding the failure of the polarized black charged microspheres.

[0063] According to some embodiments of the present application, the material forming the first insulating layer is not particularly limited, for example, the material forming the first insulating layer can include at least one of SiO, SiN and polyacrylate adhesive. The material forming the second insulating layer can be consistent with the material forming the first insulating layer, which will not be repeated here.

[0064] According to some embodiments of the present application, the shape of the pixel electrode layer is not particularly limited, for example, referring to Figure 1 and Figure 2For example, the pixel electrode layer 110 can be an integral layer structure, and thus the aforementioned display panel can be obtained. For another example, referring to Figures 5-6 , Figures 9-16 , and Figures 17-21 , when the pixel electrode layer 110 is arranged in a patterned manner, the induced capacitance between the pixel electrode layer 110 and the reflective metal 420 of the reflective structure can be reduced, and thus the sensitivity of the pixel electrode layer to the charged microspheres and the response speed of the display panel can be improved. Specifically, the orthogonal projection of the pixel electrode layer 110 on the first substrate 100 can at least partially surround the orthogonal projection of the reflective structure on the first substrate 100.

[0065] According to some embodiments of the present application, the shape of the pixel electrode layer is not particularly limited. For example, the orthogonal projection of the pixel electrode layer 110 on the first substrate 100 can be a plurality of mutually connected closed patterns, such as at least one of a triangle (see Figure 21 ), a circle (see and

[0068] ), a rectangle (see and

[0069] ), and a regular polygon (see and

[0070] ). Figure 22 According to some embodiments of the present application, referring to

[0071] , the size of the pixel isolation column 300 is not particularly limited, as long as it can define a sub-pixel region on the first substrate 100 and the second substrate 200, and form a closed sub-pixel space between the first substrate 100 and the second substrate 200. For example, the height of the pixel isolation column 300 can be 3-15 μm, and the width of the pixel isolation column 300 can be 1-10 μm, in a direction from the first substrate 100 to the second substrate 200.

[0072] According to some embodiments of the present application, referring to and

[0073] , the type of the charged microspheres in the ink is not particularly limited. For example, the sub-pixel region further includes white charged microspheres 20, and in this case, the sub-pixel region includes black charged microspheres 10 and white charged microspheres 20. Specifically, referring to Figure 22 , when a voltage attracting the black charged microspheres is applied to the pixel electrode layer 110, and a common voltage is applied to the common electrode layer 210, the white charged microspheres 20 move and are adsorbed on the surface of the sub-pixel region close to the second substrate 200 side, and the black charged microspheres move and are adsorbed in the gap between the adjacent reflective structures close to the first substrate 100 side, so that the incident ambient light (such as the solid arrow shown in is first reflected in the top region where the white charged microspheres 20 are located (such as

[0074] (As shown by the dashed arrow in the middle), the light rays passing through the white charged microsphere 20 (such as...) Figure 20 (As shown by the solid arrow) Reflection occurs between the reflective metal 420 on adjacent reflective structures (such as...) Figure 20 (As shown by the dashed arrow), the light ultimately escapes from the emitting side, and the display panel becomes bright. The brightness of the display panel can be significantly improved through the reflection of the white charged microspheres and the secondary reflection of the reflective structure; Reference Figure 21 When a voltage is applied to the pixel electrode layer 110 to repel and attract the black charged microspheres, and a common voltage is applied to the common electrode layer 210, the black charged microspheres 10 move and adhere to the surface of the sub-pixel region near the second substrate 200, while the white charged microspheres 20 move to the gap between adjacent reflective structures near the first substrate 100, where ambient light (such as...) is incident. Figure 21 (As indicated by the solid arrow) The black charged microspheres 10 absorb the light, resulting in no reflected light escaping and a dark display panel. By controlling the voltage applied to the pixel electrode layer 110 and the common electrode layer, the positions of the black charged microspheres 10 and white charged microspheres 20 within the sub-pixel region can be controlled, thereby controlling the bright and dark states of the sub-pixels and achieving bright and dark display states for the display panel. Related reflective display structures suffer from low contrast. The above-described display panel structure significantly improves white brightness and achieves contrast enhancement by combining primary reflection from the white charged microspheres during bright display with secondary reflection from the reflective structure.

[0068] In another aspect of the invention, a method for preparing the aforementioned display panel is provided, comprising:

[0069] To facilitate understanding, the following is a brief explanation of the fabrication method for a display panel where the reflective metal is located only on the surface of the insulating protrusion:

[0070] According to some embodiments of the present invention, reference Figure 22 In step (a), a common electrode layer 210 is formed on the second substrate 200. Specifically, the material forming the common electrode layer can be a transparent metal, which can include at least one of ITO and IZO.

[0071] According to some embodiments of the present invention, after forming the common electrode layer, the process may further include forming a second insulating layer on the side of the common electrode layer away from the second substrate. The second insulating layer can be used to prevent the electrodes of the common electrode layer from directly contacting the polarized black charged microspheres in the ink, thereby preventing the polarized black charged microspheres from failing. The material used to form the second insulating layer can be the same as the material used to form the first insulating layer, and will not be described further here.

[0072] According to some embodiments of the present application, after the second insulating layer is formed, the second insulating layer of the second substrate edge region can be removed to expose the second connecting electrode, for subsequent electrical connection of the second connecting electrode and the first connecting electrode by the conductive gold balls in the frame sealing glue during frame sealing.

[0073] According to some embodiments of the present application, referring to (b) of Figure 22 , in this step, pixel isolation columns 300 are formed on the first substrate and / or the second substrate 200 to define a plurality of sub-pixel regions. Specifically, the pixel isolation columns can be prepared by using black organic glue.

[0074] According to some embodiments of the present application, referring to (c) of Figure 23 , in this step, a pixel electrode layer 110 is formed on the first substrate 100, and after the preparation of the pixel electrode layer 110 is completed, a first insulating layer 111 is deposited on the pixel electrode layer 110. The first insulating layer 111 can prevent the pixel electrode layer from directly contacting the polarized black charged microspheres in the ink, thereby avoiding the failure of the polarized black charged microspheres.

[0075] According to some embodiments of the present application, after the first insulating layer is formed, the first insulating layer of the first substrate edge region can be removed to expose the first connecting electrode, for subsequent electrical connection of the second connecting electrode and the first connecting electrode by the conductive gold balls in the frame sealing glue during frame sealing.

[0076] According to some embodiments of the present application, referring to (d) and (e) of Figure 23 , in this step, light control components are arranged in the sub-pixel regions. Specifically, insulating protrusions 410 (see Figure 24 ) can be imprinted on the first substrate 100 by a nano-imprinting process, and then reflective metal 420 is deposited on the first substrate 100 and patterned to leave only the reflective metal on the insulating protrusions 410.

[0077] According to some embodiments of the present application, in this step, the first substrate and the second substrate are coupled to form a sub-pixel closed space; ink is injected into the sub-pixel closed space and sealed to obtain a display panel. The type of ink is not particularly limited, for example, the ink can only include black charged microspheres, or can include black charged microspheres and white charged microspheres.

[0078] For ease of understanding, the preparation method of the display panel with the reflective metal located on the surface of the insulating protrusions and on the side wall of the pixel isolation column is briefly described as follows:

[0079] According to some embodiments of the present application, referring to Figure 25In (a) of FIG. 1, color resist layers 213 are formed on the second substrate 200, and black matrix layers 214 are formed between adjacent color resist layers 213. There is a step difference between the color resist blocks and the black matrix layers 214, i.e., the black matrix layers are in a groove structure, which can be used as a positioning groove during the bonding of the first substrate and the second substrate.

[0080] According to some embodiments of the present application, referring to Figure 25 In (b) of FIG. 1, the common electrode layer 210 is formed after the color resist layers 213 are formed. Specifically, the material of the common electrode layer can be a transparent metal, and specifically, the transparent metal can include at least one of ITO and IZO.

[0081] According to some embodiments of the present application, after the common electrode layer is formed, a second insulating layer can be further formed on the side of the common electrode layer away from the second substrate. The second insulating layer can be used to prevent the electrode of the common electrode layer from directly contacting the polarized black charged microspheres in the ink, thereby avoiding the failure of the polarized black charged microspheres. The material of the second insulating layer can be consistent with the material of the first insulating layer, which will not be described here again.

[0082] According to some embodiments of the present application, after the second insulating layer is formed, the second insulating layer in the edge region of the second substrate can be removed to expose the second connecting electrode, which is used to electrically connect the second connecting electrode and the first connecting electrode by using the conductive gold balls in the frame sealing glue during the subsequent frame sealing.

[0083] According to some embodiments of the present application, referring to Figure 26 In (c) of FIG. 1, the pixel electrode layer 110 is formed on the first substrate 100. After the preparation of the pixel electrode layer 110 is completed, the first insulating layer 111 is deposited on the pixel electrode layer 110. The first insulating layer 111 can prevent the pixel electrode layer from directly contacting the polarized black charged microspheres in the ink, thereby avoiding the failure of the polarized black charged microspheres.

[0084] According to some embodiments of the present application, after the first insulating layer is formed, the first insulating layer in the edge region of the first substrate can be removed to expose the first connecting electrode, which is used to electrically connect the second connecting electrode and the first connecting electrode by using the conductive gold balls in the frame sealing glue during the subsequent frame sealing.

[0085] According to some embodiments of the present application, referring to Figure 26In the step of forming the light control assembly, the insulating protrusions 410 are formed, and the reflective metal 420 is formed on the side surface of the insulating protrusions 410 facing the second substrate 200. The pixel isolation column 300 and the insulating protrusions 410 are formed synchronously, and after the pixel isolation column 300 and the insulating protrusions 410 are formed, the reflective metal 420 is further formed on the side wall of the pixel isolation column 300 and the side surface of the insulating protrusions 410 facing the second substrate 200, so that the pixel isolation column structure with the reflective metal on the surface can be obtained.

[0086] According to some embodiments of the present application, in this step, the first substrate and the second substrate are coupled to form a sub-pixel sealed space; ink is injected into the sub-pixel sealed space and a sealing process is performed to obtain a display panel. The type of ink is not particularly limited, for example, the ink can only include black charged microspheres, or can include black charged microspheres and white charged microspheres.

[0087] In another aspect of the present application, the present application provides a display device having the aforementioned display panel. Therefore, the display device has all the features and advantages of the aforementioned display panel, which will not be described here.

[0088] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. All patents and publications referred to in this application are incorporated by reference in their entirety. The terms "comprising" or "including" are open-ended terms, i.e., include the stated elements but not to the exclusion of other elements. In the present application, all numbers disclosed herein are approximate values, unless otherwise specified. Each numerical value has a tolerance of ± 10% or other tolerance recognized by those skilled in the art, such as ± 1%, ± 2%, ± 3%, ± 4%, or ± 5%.

[0089] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0090] In the description of the present application, "first feature" and "second feature" can include one or more features.

[0091] In the description of the present application, "a plurality of" means two or more.

[0092] In the description of the application, the first feature is "on" or "under" the second feature can include the first and second features are in direct contact, but also can include the first and second features are not in direct contact but through the additional features between them are in contact.

[0093] In the description of the application, the first feature is "on", "above" and "over" the second feature includes the first feature is directly above and obliquely above the second feature, or just means that the first feature is higher than the second feature in height.

[0094] In the description of the application, "A and / or B" can include the case of A alone, the case of B alone, any one of the case of A and B, wherein A, B are only used for example, which can be any technical features connected by "and / or" in the application.

[0095] In the description of the application, the description of the reference terms "one embodiment", "another embodiment" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the application. In the description of the application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the features of different embodiments or examples described in the specification and different embodiments or examples without contradiction. In addition, it should be noted that in the specification, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0096] Although the embodiments of the application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. A display panel, characterized by, The display panel comprises: a first substrate and a second substrate arranged oppositely; a pixel electrode layer on one side of the first substrate; a common electrode layer on the side of the second substrate facing the first substrate; a pixel isolation column between the first substrate and the second substrate, defining a plurality of sub-pixel regions in the first substrate and the second substrate, and having black charged microspheres in the sub-pixel regions, a light control component in the sub-pixel region, and the light control component is configured to reflect light to the light-emitting side of the display panel; the side of the second substrate is the light-emitting side, the light control component is on the side of the first substrate facing the second substrate, the light control component comprises a reflective structure, the reflective structure comprises an insulating protrusion on the side of the first substrate facing the second substrate, and the cross-sectional area of the insulating protrusion gradually decreases from the direction of the first substrate to the second substrate, and the side of the insulating protrusion away from the first substrate has a reflective metal; the light control component comprises an electrochromic layer on the surface of the side of the light-emitting side substrate facing the sub-pixel region, the electrochromic layer has a transparent state and an absorbing state, and the orthographic projection of the electrochromic layer on the first substrate is located in the sub-pixel region.

2. The display panel of claim 1, wherein, The reflective structure is at least one of a pyramid, a cone, a platform, and a hemisphere.

3. The display panel of claim 2, wherein, The number of edges of the pyramid and the platform is 3-8, and the angle between the edge and the bottom surface is 10-45°.

4. The display panel of claim 1, wherein, The side wall of the pixel isolation column has the reflective metal.

5. The display panel of claim 1, wherein, Further comprising a color resistance layer, the color resistance layer comprises a plurality of color resistance blocks, the color resistance layer is between the common electrode layer and the second substrate, the orthographic projection of the pixel isolation column on the first substrate does not coincide with the orthographic projection of the color resistance layer on the first substrate, there is a black matrix layer between adjacent color resistance blocks, and the height difference between the color resistance layer and the black matrix layer is 3-15 μm from the direction of the first substrate to the second substrate.

6. The display panel of claim 1, wherein, Further comprising at least one of the following structures: a first insulating layer on the side of the pixel electrode layer away from the first substrate, the first insulating layer covering the pixel electrode layer; a second insulating layer on the side of the common electrode layer away from the second substrate, the second insulating layer covering the common electrode layer; a first connecting electrode on the side of the first substrate and surrounding the edge region of the first substrate, and a second connecting electrode on the side of the second substrate and surrounding the edge region of the second substrate, the first connecting electrode and the second connecting electrode being electrically connected by conductive sealant.

7. The display panel of claim 1, wherein, The orthographic projection of the pixel electrode layer on the first substrate at least partially surrounds the orthographic projection of the reflective structure on the first substrate.

8. The display panel of claim 7, wherein, The orthographic projection of the pixel electrode layer on the first substrate is a plurality of interconnected closed figures, and the closed figures comprise at least one of a triangle, a circle, a rectangle, and a regular polygon.

9. The display panel of claim 1, wherein, The height of the pixel isolation column is 3-15 μm and the width of the pixel isolation column is 1-10 μm in the direction from the first substrate to the second substrate.

10. The display panel of claim 1, wherein, The sub-pixel region further comprises white charged microspheres.

11. A method for preparing the display panel according to any one of claims 1-10, characterized in that, forming a pixel electrode layer on the first substrate; forming a common electrode layer on the second substrate; forming a pixel isolation column on the first substrate and / or the second substrate to define a plurality of sub-pixel regions; arranging a light control component in the sub-pixel region; adjoining the first substrate and the second substrate to form a sub-pixel closed space; injecting ink into the sub-pixel closed space and performing a sealing process to obtain the display panel.

12. The method of claim 11, wherein, forming the light control component comprises forming an insulating protrusion and forming a reflective metal on a side surface of the insulating protrusion facing the second substrate, wherein the pixel isolation column and the insulating protrusion are formed synchronously, and further comprising forming the reflective metal on a side wall of the pixel isolation column and a side surface of the insulating protrusion facing the second substrate after forming the pixel isolation column and the insulating protrusion.

13. A display device comprising: The display device has the display panel according to any one of claims 1-10.

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