Flexible electronic paper display panel, preparation method and display device

Abstract

The invention discloses a flexible electronic paper display panel, a preparation method and a display device, and mainly relates to the technical field of display, the flexible electronic paper display panel comprises a first flexible substrate, a pixel unit layer, an electronic paper reflecting layer, a transparent electrode layer and a second flexible substrate; the pixel unit layer, the electronic paper reflecting layer, the transparent electrode layer and the second flexible substrate are sequentially arranged on the first flexible substrate; the flexible electronic paper display panel further comprises a bending area and a plurality of metal wires, and the metal wires are arranged on the portion, in the bending area, of the second flexible substrate and located on the side, close to the transparent electrode layer, of the second flexible substrate. Through the design, the situation that the brightness of the bending area of the flexible electronic paper display panel becomes low after the transparent electrode layer is broken is avoided.

Description

Technical Field

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

[0002] With the development of digital technology, more and more display devices have entered people's lives, such as electronic paper (EP) display panels. Since electronic paper display panels can maintain display for a long time in the case of power failure, and have the advantages of lightness, thinness, low power consumption, and simple process, they are becoming more and more popular.

[0003] The current flexible electronic paper display panels can be rolled up and folded at will by using a flexible substrate made of polyimide film. However, due to repeated bending during use, the brightness of the display screen at the bending area is lower than normal. Summary of the invention

[0004] The purpose of the present application is to provide a flexible electronic paper display panel and a preparation method and a display device to avoid the situation in which the brightness of the bending area of ​​the flexible electronic paper display panel becomes low due to the breakage of the transparent electrode layer.

[0005] The present application discloses a flexible electronic paper display panel, which comprises a first flexible substrate, a pixel unit layer, an electronic paper reflective layer, a transparent electrode layer and a second flexible substrate; the pixel unit layer, the electronic paper reflective layer, the transparent electrode layer and the second flexible substrate are sequentially arranged on the first flexible substrate; The flexible electronic paper display panel also includes a bending area, and the flexible electronic paper display panel also includes a plurality of metal wires, which are arranged on the second flexible substrate in the bending area and located on a side of the second flexible substrate close to the transparent electrode layer.

[0006] Optionally, a plurality of optical path adjustment channels are provided on the second flexible substrate; the opening of the optical path adjustment channel faces the first flexible substrate, the cross-sectional shape of the optical path adjustment channel in the width direction is a triangle, the optical path adjustment channel includes a first side wall and a second side wall, and the first side wall is connected to the second side wall; The metal wire is filled in the optical path adjustment channel to reflect the light irradiated on the metal wire from the outside to the electronic paper reflection layer.

[0007] Optionally, the optical path adjustment channel includes a plurality of transverse channels and a plurality of longitudinal channels, and the plurality of transverse channels and the plurality of longitudinal channels are arranged in a transverse and vertical arrangement.

[0008] Optionally, the optical path adjustment channel only includes a plurality of longitudinal channels.

[0009] Optionally, the flexible electronic paper display panel also includes a flat area, which is arranged on both sides of the bending area; the optical path adjustment channel is arranged only on the second flexible substrate within the bending area, and the length direction of the bending area is defined as a first direction, and the length direction of the longitudinal channel is the same as the first direction.

[0010] Optionally, a width direction of the bending area is defined as a second direction, and along the second direction, a distance between two adjacent longitudinal grooves of the plurality of longitudinal grooves gradually increases.

[0011] Optionally, along the second direction, the slopes of the first side wall and the second side wall of the longitudinal channel gradually decrease, and along the second direction, the depth of the longitudinal channel gradually decreases.

[0012] The present application also discloses a method for preparing a flexible electronic paper display panel, which is used to prepare a flexible electronic paper display panel. The steps of the method for preparing a flexible electronic paper display panel include: Disposing a pixel unit layer on a first flexible substrate to form a first substrate; Disposing a metal line on the second flexible substrate; Disposing a transparent electrode layer on the metal wire to form a second substrate; The first substrate, the electronic paper reflective layer and the second substrate are laminated together, and the electronic paper reflective layer is located between the transparent electrode layer and the first substrate.

[0013] Optionally, the step of providing a metal wire on the second flexible substrate includes: forming a second flexible substrate on the front surface of the first mold; The second flexible substrate is peeled off from the first mold to form a second flexible substrate having an optical path adjustment channel, wherein the front surface of the first mold has a convex structure, and the shape of the convex structure matches the shape of the optical path adjustment channel; Disposing a metal layer on the second flexible substrate, and the metal layer fills the optical path adjustment channel; The metal layer is photolithographically formed into a metal line, and the orthographic projection of the metal line on the second flexible substrate covers the optical path adjustment channel.

[0014] The present application also discloses a display device, which includes a driving circuit and a flexible electronic paper display panel. The driving circuit is connected to the flexible electronic paper display panel to drive the flexible electronic paper display panel to display a picture.

[0015] Compared with the existing flexible electronic paper display panel solutions, the present application sets a metal wire between the second flexible substrate and the transparent electrode layer. When the flexible electronic paper display panel is repeatedly bent, the transparent electrode layer will not be broken due to the reinforcing effect of the metal wire, thereby avoiding the situation where the brightness of the bending area of ​​the flexible electronic paper display panel becomes low after the transparent electrode layer is broken. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 is a schematic diagram of a display device according to an embodiment of the present application; Figure 2 is a schematic diagram of a flexible electronic paper display panel according to the first embodiment of the present application; Figure 3 is a schematic diagram of a second flexible substrate according to the first embodiment of the present application; Figure 4 is a schematic diagram of a flexible electronic paper display panel provided with an optical path adjustment channel according to the first embodiment of the present application; Figure 5 is a plan view schematic diagram of an optical path adjustment channel of the first embodiment of the present application; Figure 6 is a schematic diagram of the intersection of a transverse channel and a longitudinal channel of the first embodiment of the present application; Figure 7 is a schematic plan view of the intersection of a transverse channel and a longitudinal channel of the first embodiment of the present application; Figure 8 is a schematic diagram of a folding type flexible electronic paper display panel of the first embodiment of the present application; Fig. 9 is a schematic diagram of a longitudinal channel of the first embodiment of the present application; Fig.10 is a schematic diagram of a flexible electronic paper display panel according to a second embodiment of the present application; Fig.11 is a schematic diagram of a flexible electronic paper display panel according to a third embodiment of the present application; Fig.12 A schematic diagram of a process for preparing a flexible electronic paper display panel according to an embodiment of the present application; Fig.13A schematic diagram of a process for preparing a flexible electronic paper display panel according to an embodiment of the present application; Fig.14 A schematic diagram of a process for preparing a method for disposing a metal wire on a second flexible substrate according to an embodiment of the present application; Fig.15 A schematic diagram of a process for preparing a method for disposing a metal wire on a second flexible substrate according to an embodiment of the present application.

[0017] Among them, 10, display device; 20, driving circuit; 30, flexible electronic paper display panel; 31, flat area; 32, bending area; 100, first flexible substrate; 110, pixel unit layer; 111, active switch layer; 111a, active switch; 112, pixel electrode layer; 112a, pixel electrode; 120, electronic paper reflective layer; 130, transparent electrode layer; 140, metal wire; 150, second flexible substrate; 200, optical path Adjustment channel; 211, first side wall; 212, second side wall; 220, transverse channel; 221, first sub-transverse channel; 222, second sub-transverse channel; 230, longitudinal channel; 231, first sub-longitudinal channel; 232, second sub-longitudinal channel; 240, intersection; 250, chamfered surface; 261, A area; 262, a small area; 310, first mold; 320, protruding structure; 330, metal layer; 400, second direction. DETAILED DESCRIPTION

[0018] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative, but the present application can be implemented in many alternative forms and should not be construed as being limited to only the embodiments described herein.

[0019] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, features defined as "first" and "second" may explicitly or implicitly include one or more of the features; "plurality" means two or more. The term "including" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof may exist or be added.

[0020] In addition, terms indicating orientation or positional relationships, such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside,” are described based on the orientation or relative positional relationships shown in the accompanying drawings and are merely simplified descriptions for the convenience of describing the present application. They do not indicate that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limitations on the present application.

[0021] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internally connected between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0023] Figure 1 is a schematic diagram of a display device according to an embodiment of the present application. Figure 1 As shown, the present application discloses a display device 10, which includes a driving circuit 20 and a flexible electronic paper display panel 30, wherein the driving circuit 20 is connected to the flexible electronic paper display panel 30, and the driving circuit 20 is used to drive the flexible electronic paper display panel 30 to display an image.

[0024] The present application also discloses a flexible electronic paper display panel 30, which can be used in the display device 10 described above. For the flexible electronic paper display panel 30, the present application provides the following design, which is specifically introduced through several embodiments: Embodiment 1: Figure 2 is a schematic diagram of a flexible electronic paper display panel according to the first embodiment of the present application, such as Figure 2 As shown, the present application discloses a flexible electronic paper display panel 30, which includes a first flexible substrate 100, a pixel unit layer 110, an electronic paper reflective layer 120, a transparent electrode layer 130 and a second flexible substrate 150; the pixel unit layer 110, the electronic paper reflective layer 120, the transparent electrode layer 130 and the second flexible substrate 150 are sequentially arranged on the first flexible substrate 100.

[0025] The flexible electronic paper display panel 30 also includes a bending area 32 , and the flexible electronic paper display panel 30 also includes a plurality of metal wires 140 , which are arranged on the second flexible substrate 150 in the bending area 32 and are located on a side of the second flexible substrate 150 close to the transparent electrode layer 130 .

[0026] The flexible electronic paper display panel 30 of the present application can be used in a curved screen as well as a folding screen.

[0027] Exemplarily, when the flexible electronic paper display panel 30 is used for a curved screen, the entire flexible electronic paper display panel 30 is defined as a bending area 32 ; when the flexible electronic paper display panel 30 is used for a folding screen, the folding position of the flexible electronic paper display panel 30 is defined as a bending area 32 .

[0028] The pixel unit layer 110 includes an active switch layer 111 and a pixel electrode layer 112 . The active switch layer 111 is disposed on the first flexible substrate 100 , and the pixel electrode layer 112 is disposed on the active switch layer 111 .

[0029] The active switch layer 111 includes a plurality of active switches 111a, and the pixel electrode layer 112 includes a plurality of pixel electrodes 112a. The plurality of pixel electrodes 112a are connected to the plurality of active switches 111a in a one-to-one correspondence. An electric field is formed between the pixel electrodes 112a and the common electrode to drive the electronic paper reflective layer 120 to reflect light.

[0030] Among them, the electronic paper reflective layer 120 may include a microcapsule structure or a microcup structure. The microcapsules in the electronic paper reflective layer 120 with the microcapsule structure are filled with electrophoretic particles, and the microcups in the microcup structure may be filled with electrophoretic particles or electrophoretic ink; the electrophoretic particles may include only black and white particles, or may include colored particles such as red particles, green particles, blue particles, etc.

[0031] Exemplarily, the first flexible substrate 100 and the second flexible substrate 150 are made of polyimide film.

[0032] The applicant has found that after repeated bending, the existing flexible electronic paper display panel will have a reduced brightness in the bending area 32. This is mainly because the transparent electrode layer 130 in the bending area 32 is prone to breakage. After the transparent electrode layer 130 breaks, the impedance will be large, resulting in a smaller voltage difference between the transparent electrode layer 130 and the opposite pixel electrode 112a, thereby causing the image at this location to be lower than normal brightness.

[0033] Compared with the existing flexible electronic paper display panel solutions, the present application sets a metal wire 140 between the second flexible substrate 150 and the transparent electrode layer 130. When the flexible electronic paper display panel 30 is repeatedly bent, the transparent electrode layer 130 will not be broken due to the reinforcing effect of the metal wire 140, thereby avoiding the situation where the brightness of the bending area of ​​the flexible electronic paper display panel 30 becomes low after the transparent electrode layer 130 is broken.

[0034] Furthermore, the metal wire 140 is directly connected to the transparent electrode layer 130 , which can effectively reduce the impedance of the entire transparent electrode layer 130 , and the transparent electrode layer 130 can reach the required voltage more quickly, thereby enabling the movement of electrophoretic particles in the electronic paper reflective layer 120 to be quickly realized and effectively reducing the power consumption of the flexible electronic paper display panel 30 .

[0035] After the metal wire 140 is set, even if the transparent electrode layer 130 in the bending area 32 is broken, the metal wire 140 closest to the break will connect the transparent electrode layers 130 on both sides of the break, so that the impedance of the transparent electrode layers 130 on both sides of the break remains close, thereby ensuring that the voltage of the transparent electrode layer 130 at the break is maintained within the same level range as the voltage of the transparent electrode layer 130 at other positions.

[0036] Figure 3 is a schematic diagram of a second flexible substrate of the first embodiment of the present application, Figure 4 is a schematic diagram of a flexible electronic paper display panel provided with an optical path adjustment channel according to the first embodiment of the present application, such as Figure 3-Figure 4 As shown, Figure 4 The direction indicated by the middle arrow represents the path of emission after part of the light is irradiated to the metal wire 140. Since the flexible electronic paper display panel 30 displays the picture by irradiating the light to the electronic paper reflective layer 120 and then reflecting it, the metal wire 140 is arranged between the second flexible substrate 150 and the transparent electrode layer 130, which will make the user see the existence of bright lines, especially when watching at a wide viewing angle, the bright lines are more obvious.

[0037] Therefore, the present application has been further improved, and a plurality of optical path adjustment channels 200 are provided on the second flexible substrate 150; the opening of the optical path adjustment channel 200 faces the first flexible substrate 100, and the cross-sectional shape of the optical path adjustment channel 200 in the width direction is a triangle, and the optical path adjustment channel 200 includes a first side wall 211 and a second side wall 212, and the first side wall 211 is connected to the second side wall 212.

[0038] The metal wire 140 is filled in the optical path adjustment channel 200 to reflect the light irradiated from the outside onto the metal wire 140 onto the electronic paper reflection layer 120.

[0039] Simply put, by providing a triangular optical path adjustment channel 200 on the second flexible substrate 150 and disposing the metal wire 140 on the optical path adjustment channel 200, when the external light irradiates onto the metal wire 140, it will not be directly reflected, but will be reflected to the underlying electronic paper reflection layer 120 through the reflection of the first sidewall 211 and the second sidewall 212, and then the electronic paper reflection layer 120 determines whether to reflect or absorb it for light utilization.

[0040] In this way, it is possible to prevent the light irradiated from the outside onto the metal wire 140 from being directly reflected, so that the amount of light entering the electronic paper reflection layer 120 on the flexible electronic paper display panel 30 will not be reduced, and it is also not necessary to make the metal wire 140 very thin, that is, the width of the metal wire 140 can be greater than the gap between two adjacent pixel electrodes 112a, and the gap between two adjacent pixel electrodes 112a is less than or equal to 14 μm.

[0041] Second, it is not necessary to completely dispose the metal wire 140 at the position corresponding to the gap between two adjacent pixel electrodes 112a below, that is, the orthographic projection of the metal wire 140 on the first flexible substrate 100 does not completely cover the gap between two adjacent pixel electrodes 112a, or the orthographic projection of the optical path adjustment channel 200 on the first flexible substrate 100 does not completely cover the gap between two adjacent pixel electrodes 112a. Even if the metal wire 140 is provided directly above the pixel electrode 112a, it is also possible.

[0042] Moreover, it is also possible to prevent the phenomenon that the white bright line can be directly seen on the flexible electronic paper display panel 30 when viewing the flexible electronic paper display panel 30 at a large viewing angle.

[0043] And one end of the metal wire 140 close to the first flexible substrate 100 protrudes from the opening plane of the optical path adjustment channel 200 and is connected to the transparent electrode layer 130, that is, the height of the metal wire 140 is greater than the depth of the optical path adjustment channel 200.

[0044] Exemplarily, define the height of the second flexible substrate 150 as d1; define the depth of the optical path adjustment channel 200 as d2; define the height of the electronic paper reflection layer 120 as d3; define the opening width of the optical path adjustment channel 200 as d4, 0 < d2 ≤ 1 / 3d1, 0 < d4 ≤ d3, define the included angle between the first sidewall 211 and the second sidewall 212 as a, and the range of the angle a is 30° - 150°, 0.05 mm ≥ d1 ≥ 0.5 mm.

[0045] Thereby, the light irradiated on the metal wire 140 in the optical path adjustment channel 200 can be directly reflected on the electronic paper reflective layer 120 below the area close to the optical path adjustment channel 200, but will not be reflected on the electronic paper reflective layer 120 in other areas, and the metal wire 140 can be prevented from blocking too much light.

[0046] Figure 5 is a plan view of an optical path adjustment channel of the first embodiment of the present application, such as Figure 5 As shown, in order to further prevent the transparent electrode layer 130 from breaking, the optical path adjustment channel 200 includes a plurality of transverse channels 220 and a plurality of longitudinal channels 230, and the plurality of transverse channels 220 and the plurality of longitudinal channels 230 are arranged horizontally and vertically.

[0047] Exemplarily, multiple transverse channels 220 may be parallel, multiple longitudinal channels 230 may be parallel, and the transverse channels 220 and the longitudinal channels 230 are vertically arranged, so as to further prevent the transparent electrode layer 130 from breaking. When the flexible electronic paper display panel 30 is a folding screen, the length direction of the transverse channel 220 is perpendicular to the length direction of the bending area 32, and the length direction of the longitudinal channel 230 is consistent with the length direction of the bending area 32.

[0048] Figure 6 is a schematic diagram of the intersection of a transverse channel and a longitudinal channel in the first embodiment of the present application, Figure 7 is a schematic plan view of the intersection of a transverse channel and a longitudinal channel of the first embodiment of the present application, such as Figure 6-Figure 7 As shown, further, the intersection 240 is formed at the intersection of the transverse channel 220 and the longitudinal channel 230, and the transverse channels 220 on both sides of the intersection 240 are defined as the first sub-transverse channel 221 and the second sub-transverse channel 222, and the longitudinal channels 230 on both sides of the intersection 240 are defined as the first sub-longitudinal channel 231 and the second sub-longitudinal channel 232.

[0049] A chamfered surface 250 is provided between the first side wall 211 of the first sub-transverse channel 221 and the second side wall 212 of the first sub-longitudinal channel 231 , and a chamfered surface 250 is provided between the second side wall 212 of the first sub-transverse channel 221 and the second side wall 212 of the second sub-longitudinal channel 232 .

[0050] A chamfered surface 250 is provided between the first side wall 211 of the second sub-transverse channel 222 and the first side wall 211 of the first sub-longitudinal channel 231 , and a chamfered surface 250 is provided between the second side wall 212 of the second sub-transverse channel 222 and the first side wall 211 of the second sub-longitudinal channel 232 .

[0051] The slope of the chamfered surface 250 , the slope of the first side wall 211 , and the slope of the second side wall 212 are all equal.

[0052] When light hits the chamfered surface 250 , it will be reflected to the electronic paper reflective layer 120 below the corresponding chamfered surface 250 , thereby avoiding the appearance of white spots when displaying at the intersection 240 where the horizontal channel 220 and the vertical channel 230 meet.

[0053] Specific, combined Figure 5-Figure 7 As shown, when the chamfered surface 250 is not provided, the light is irradiated to Figure 5 Light in any of the eight a-small areas 262 in the A area 261 will be reflected toward other a-small areas 262 in the A area 261, and thus directly reflected to the outside of the flexible electronic paper display panel 30, and will not be reflected to the electronic paper reflective layer 120 below. Therefore, the A area 261 formed by the eight a-small areas 262 converging together will form a white spot. The further design of the present application is equivalent to dispersing the eight small A areas 261, so that the original eight a-small areas 262 no longer converge at the intersection 240, thereby avoiding the occurrence of white spots when the flexible electronic paper display panel 30 is displayed.

[0054] Figure 8 is a schematic diagram of a folding type flexible electronic paper display panel of the first embodiment of the present application, Fig. 9 is a schematic diagram of a longitudinal channel of the first embodiment of the present application, such as Figure 8-Figure 9 As shown, Fig. 9 The direction indicated by the middle arrow represents the direction in which part of the light is reflected when it is irradiated to the first side wall 211 or the second side wall 212 of the metal wire 140. The flexible electronic paper display panel 30 also includes a flat area 31, and the flat area 31 is arranged on both sides of the bending area 32; the optical path adjustment channel 200 is only arranged on the second flexible substrate 150 within the bending area 32, and the length direction of the bending area 32 is defined as the first direction, and the length direction of the longitudinal channel 230 is the same as the first direction.

[0055] When the flexible electronic paper display panel 30 is used in the flexible electronic paper display panel 30 of the folding screen, the present application only provides the optical path adjustment channel 200 on the second flexible substrate 150 in the bending area 32, that is, it can also be considered that the metal wire 140 is provided only on the second flexible substrate 150 in the bending area 32, so as not to affect the light on the flat area 31, and the optical path adjustment channel 200 is provided in the bending area 32, which is equivalent to reducing the film thickness of the second flexible substrate 150 in the bending area 32 in disguised form, thereby avoiding excessive stress in the bending area 32 when bending, and the strength of the bending area 32 is further enhanced by providing the metal wire 140.

[0056] Furthermore, when the flexible electronic paper display panel 30 is bent, the closer to the middle of the bending area 32, the greater the bending degree of the transparent electrode layer 130, and therefore the greater the stress it is subjected to, making it more prone to breakage. Therefore, the present application also performs special treatment on the middle of the bending area 32.

[0057] The width direction of the bending area 32 is defined as a second direction 400 . Along the second direction 400 , the distance between two adjacent longitudinal channels 230 in the plurality of longitudinal channels 230 gradually increases.

[0058] Simply put, the longitudinal grooves 230 in the middle of the bending area 32 are denser, and the longitudinal grooves 230 in the bending area 32 close to the flat area 31 are sparser. Therefore, the metal wires 140 arranged in the longitudinal grooves 230 will also appear denser, thereby coping with the problem of greater gravity in the middle of the bending area 32.

[0059] However, since there are more longitudinal grooves 230 arranged in the middle of the bending area 32, there are also more metal wires 140, resulting in a greater loss of external light in the middle of the bending area 32. Therefore, the present application also deepens the longitudinal grooves 230 in the middle of the bending area 32.

[0060] That is, along the second direction 400 , the slopes of the first side wall 211 and the second side wall 212 of the longitudinal channel 230 gradually decrease. In other words, the angle between the first side wall 211 and the second side wall 212 gradually increases, and the depth of the longitudinal channel 230 along the second direction 400 gradually decreases.

[0061] Thereby, when the external light is irradiated to the middle of the bending area 32 , the reflection angle of the light is larger, so that the light irradiated to the middle of the bending area 32 can be directly reflected to the electronic paper reflection layer 120 below the middle of the bending area 32 .

[0062] When the external light hits the edge of the bending area 32 close to the flat area 31, the reflection angle of the light is smaller, so that the light hitting the edge of the bending area 32 close to the flat area 31 can be directly reflected to the electronic paper reflective layer 120 below the middle of the bending area 32, thereby compensating for the problem of uneven brightness of the bending area 32 under the same reflection conditions due to the more dense longitudinal channels 230 and metal wires 140 in the middle of the bending area 32. The same conditions refer to, for example, displaying the same grayscale simultaneously in the entire bending area 32.

[0063] Embodiment 2: Fig.10 is a schematic diagram of a flexible electronic paper display panel according to the second embodiment of the present application, such as Fig.10 As shown, different from the first embodiment, this embodiment only has a longitudinal channel 230, and the optical path adjustment channel 200 only includes a plurality of longitudinal channels 230. Exemplarily, the plurality of longitudinal channels 230 may be arranged in parallel, and a metal line 140 is arranged in each longitudinal channel 230.

[0064] In this embodiment, only the longitudinal channel 230 is provided to prevent the transparent electrode layer 130 from breaking during the bending process, thereby achieving the normal display function of the flexible electronic paper display panel 30; and also reducing the blocking of external light by the metal wire 140.

[0065] Embodiment 3: Fig.11 is a schematic diagram of a flexible electronic paper display panel 30 according to the third embodiment of the present application, such as Fig.11 As shown, different from the first embodiment, this embodiment only has a transverse channel 220, and the optical path adjustment channel 200 only includes a plurality of transverse channels 220. Exemplarily, the plurality of transverse channels 220 may be arranged in parallel, and a metal line 140 is arranged in each transverse channel 220.

[0066] In this embodiment, only the transverse channel 220 is provided to prevent the transparent electrode layer 130 from breaking during the bending process, thereby achieving the normal display function of the flexible electronic paper display panel 30; and also reducing the blocking of external light by the metal wire 140.

[0067] Fig.12 A schematic diagram of a process for preparing a flexible electronic paper display panel according to an embodiment of the present application, Fig.13 A schematic diagram of a process for preparing a flexible electronic paper display panel according to an embodiment of the present application, combined with Figure 12-13 As shown, the present application also discloses a method for preparing a flexible electronic paper display panel 30, which is used to prepare the flexible electronic paper display panel 30. The steps of the method for preparing the flexible electronic paper display panel 30 include: S1: Disposing a pixel unit layer on a first flexible substrate to form a first substrate; S2: Disposing a metal wire on the second flexible substrate; S3: Disposing a transparent electrode layer on the metal wire to form a second substrate; S4: Laminating the first substrate, the electronic paper reflective layer and the second substrate together, with the electronic paper reflective layer being located between the transparent electrode layer and the first substrate.

[0068] Among them, the step S1 can be performed first: a pixel unit layer is arranged on a first flexible substrate to form a first substrate; and then the step S2: a metal line is arranged on a second flexible substrate and the step S3: a transparent electrode layer is arranged on the metal line to form a second substrate. Of course, it is also possible to first perform the step S2: a metal line is arranged on a second flexible substrate and the step S3: a transparent electrode layer is arranged on the metal line to form a second substrate, and then perform the step S1: a pixel unit layer is arranged on a first flexible substrate to form a first substrate; this is not limited here.

[0069] Compared with the existing flexible electronic paper display panel 30 solution, the present application sets a metal wire 140 between the second flexible substrate 150 and the transparent electrode layer 130. When the flexible electronic paper display panel 30 is repeatedly bent, the transparent electrode layer 130 will not be broken due to the reinforcement effect of the metal wire 140, thereby avoiding the situation where some areas of the flexible electronic paper display panel 30 cannot display normally due to the breakage of the transparent electrode layer 130.

[0070] Exemplarily, the material of the metal wire 140 may be Al, Cu, Ag, etc.; it may also be a metal oxide; a Mo layer may be formed on the outer surface of the metal wire 140; or after the metal wire 140 is prepared, Al2O3 is sputtered to protect the metal wire 140.

[0071] For example, the transparent electrode layer 130 may be etched with oxalic acid, and the metal line may be etched with phosphoric acid or a strong acid.

[0072] In addition, the transparent electrode layer 130 of the present application is laid on the entire surface, and the voltage is also on the entire surface, so the voltage value of the transparent electrode layer 130 is relatively stable. In addition, the metal wire 140 is directly connected to the entire transparent electrode layer 130. During use, static electricity is generated on a certain metal wire 140, and the static electricity can be dispersed over a large area between the metal connected to it and the entire transparent electrode layer 130, and the static electricity is released faster.

[0073] Fig.14 A schematic diagram of a process for preparing a method for disposing a metal wire on a second flexible substrate according to an embodiment of the present application, Fig.15 A schematic diagram of a process for preparing a method for setting a metal line on a second flexible substrate according to an embodiment of the present application, combined with Figure 14-15 As shown, the step S2: the step of disposing the metal line 140 on the second flexible substrate 150 includes: S21: forming a second flexible substrate on the front surface of the first mold; S22: peeling the second flexible substrate from the first mold to form a second flexible substrate having an optical path adjustment channel, wherein the front surface of the first mold has a convex structure, and the shape of the convex structure matches the shape of the optical path adjustment channel; S23: disposing a metal layer on the second flexible substrate, wherein the metal layer fills the optical path adjustment channel; S24: Photolithography a metal layer to form a metal line, wherein the orthographic projection of the metal line on the second flexible substrate covers the optical path adjustment channel.

[0074] In short, the present application forms a second flexible substrate 150 having an optical path adjustment channel 200 by depositing a layer of polyimide film on a first mold 310 having a protruding structure 320, and then peeling the polyimide film off the first mold 310. This makes the method of preparing the second flexible substrate 150 having an optical path adjustment channel 200 simpler.

[0075] A metal layer 330 is then provided on one side of the second flexible substrate 150 where the optical path adjustment channel 200 is provided, and a metal wire 140 is formed by photolithography. By providing the metal wire 140 in the optical path adjustment channel 200 of the second flexible substrate 150, the light reflecting effect of the metal wire 140 is utilized to reflect the light that originally could not reach the electronic paper reflective layer 120 due to being irradiated on the metal wire 140 to the electronic paper reflective layer 120 below, thereby reducing the display problem caused by providing the metal wire 140 on the second flexible substrate 150.

[0076] It should be noted that the limitations on the various steps involved in this solution, without affecting the implementation of the specific solution, are not deemed to limit the order of the steps. The steps written in front can be executed first, or later, or even simultaneously. As long as this solution can be implemented, it should be deemed to fall within the scope of protection of this application.

[0077] It should be noted that the inventive concept of the present application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effects will be enhanced.

[0078] The above content is a further detailed description of the present application in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. A flexible electronic paper display panel, characterized in that: The flexible electronic paper display panel comprises a first flexible substrate, a pixel unit layer, an electronic paper reflective layer, a transparent electrode layer and a second flexible substrate; the pixel unit layer, the electronic paper reflective layer, the transparent electrode layer and the second flexible substrate are sequentially arranged on the first flexible substrate; The flexible electronic paper display panel also includes a bending area, and the flexible electronic paper display panel also includes a plurality of metal wires, which are arranged on the second flexible substrate in the bending area and located on a side of the second flexible substrate close to the transparent electrode layer.

2. The flexible electronic paper display panel according to claim 1, characterized in that: A plurality of optical path adjustment channels are provided on the second flexible substrate; the opening of the optical path adjustment channel faces the first flexible substrate, the cross-sectional shape of the optical path adjustment channel in the width direction is a triangle, the optical path adjustment channel includes a first side wall and a second side wall, and the first side wall is connected to the second side wall; The metal wire is filled in the optical path adjustment channel to reflect the light irradiated on the metal wire from the outside to the electronic paper reflection layer.

3. The flexible electronic paper display panel according to claim 2, characterized in that: The optical path adjustment channel includes a plurality of transverse channels and a plurality of longitudinal channels, and the plurality of transverse channels and the plurality of longitudinal channels are arranged in a transverse and vertical arrangement.

4. The flexible electronic paper display panel according to claim 2, characterized in that: The optical path adjustment channel only includes a plurality of longitudinal channels.

5. The flexible electronic paper display panel according to claim 3 or 4, characterized in that: The flexible electronic paper display panel also includes a flat area, which is arranged on both sides of the bending area; the optical path adjustment channel is arranged only on the second flexible substrate within the bending area, and the length direction of the bending area is defined as a first direction, and the length direction of the longitudinal channel is the same as the first direction.

6. The flexible electronic paper display panel according to claim 5, characterized in that: The width direction of the bending area is defined as a second direction, and along the second direction, the spacing between two adjacent longitudinal grooves in the plurality of longitudinal grooves gradually increases.

7. The flexible electronic paper display panel according to claim 6, characterized in that: Along the second direction, the slopes of the first sidewall and the second sidewall of the longitudinal channel gradually decrease, and the depth of the longitudinal channel gradually decreases along the second direction.

8. A method for preparing a flexible electronic paper display panel, characterized in that: For preparing the flexible electronic paper display panel according to any one of claims 1 to 7, the method for preparing the flexible electronic paper display panel comprises: Disposing a pixel unit layer on a first flexible substrate to form a first substrate; Disposing a metal line on the second flexible substrate; Disposing a transparent electrode layer on the metal wire to form a second substrate; The first substrate, the electronic paper reflective layer and the second substrate are laminated together, and the electronic paper reflective layer is located between the transparent electrode layer and the first substrate.

9. The method for preparing a flexible electronic paper display panel according to claim 8, characterized in that: The step of providing a metal line on the second flexible substrate comprises: forming a second flexible substrate on the front surface of the first mold; The second flexible substrate is peeled off from the first mold to form a second flexible substrate having an optical path adjustment channel, wherein the front surface of the first mold has a convex structure, and the shape of the convex structure matches the shape of the optical path adjustment channel; Disposing a metal layer on the second flexible substrate, and the metal layer fills the optical path adjustment channel; The metal layer is photolithographically formed into a metal line, and the orthographic projection of the metal line on the second flexible substrate covers the optical path adjustment channel.

10. A display device, characterized in that: The display device comprises a driving circuit and the flexible electronic paper display panel according to any one of claims 1 to 7, wherein the driving circuit is connected to the flexible electronic paper display panel to drive the flexible electronic paper display panel to display an image.

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