Electronic paper display panel, preparation method thereof and display device

Abstract

The application discloses an electronic paper display panel and a preparation method and a display device thereof, and relates to the technical field of display. The electronic paper display panel comprises a pixel unit region, and comprises a first substrate, an active switch layer, a light reflection layer, a light regulation unit and a second substrate, which are sequentially stacked. The light regulation unit comprises a unidirectional light transmission film and an electrophoretic film, and the unidirectional light transmission film is arranged at intervals from the electrophoretic film. Light can pass through the unidirectional light transmission film in the direction of the light regulation unit towards the active switch layer. The electrophoretic film comprises a control electrode layer and an ink layer, and the ink layer is arranged on the side of the control electrode layer away from the light reflection layer. The control electrode layer comprises a first control electrode and a second control electrode, and the first control electrode is arranged around the second control electrode. Through the above design, the thickness of the electronic paper display panel is reduced.

Description

TECHNICAL FIELD

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

[0002] The anti-peeping function can prevent others from peeping at the reading content or sensitive notifications. For example, when the electronic paper display panel is used in public places, the electronic paper display panel can switch to the anti-peeping mode through one key, limit the visual angle within ±30°, protect the user's privacy, and prevent third parties from peeping.

[0003] However, the existing electronic paper display panel capable of switching between the anti-peeping mode and the sharing mode needs two electrophoretic films to achieve the switching, thereby resulting in a large thickness of the electronic paper display panel capable of switching between the anti-peeping mode and the sharing mode. SUMMARY

[0004] The present application aims to provide an electronic paper display panel, a preparation method thereof and a display device, which reduce the thickness of the electronic paper display panel.

[0005] The present application discloses an electronic paper display panel, which comprises a pixel unit region, and comprises a first substrate, an active switch layer, a light reflection layer, a light regulation unit and a second substrate, which are sequentially stacked.

[0006] The light regulation unit comprises a unidirectional light transmission film and an electrophoretic film, and the unidirectional light transmission film is arranged in a spaced manner with the electrophoretic film. Light can pass through the unidirectional light transmission film in a direction towards the active switch layer of the light regulation unit.

[0007] The electrophoretic film comprises a control electrode layer and an ink layer, and the ink layer is arranged on a side of the control electrode layer away from the light reflection layer. The control electrode layer comprises a first control electrode and a second control electrode, and the first control electrode is arranged around the second control electrode.

[0008] Optionally, the electronic paper display panel further comprises a first light collimation layer, which is arranged on a side of the unidirectional light transmission film away from the light reflection layer. The light reflection layer comprises a plurality of reflection inclined surfaces, and the reflection inclined surfaces are directed towards the electrophoretic film.

[0009] Optionally, the electronic paper display panel further comprises a second light collimation layer and a protective layer, which are arranged in the same layer. The second light collimation layer and the protective layer are arranged on a side of the control electrode layer close to the light reflection layer.

[0010] The second light collimation layer covers the normal projection of the second control electrode on the active switch layer, and covers at least part of the normal projection of the first control electrode on the active switch layer.

[0011] Optionally, the light regulation unit further comprises a support barrier wall, which is arranged on the side of the first light collimation layer close to the electrophoretic film and on the side of the unidirectional light transmission film close to the electrophoretic film; the support barrier wall is made of a light-reflecting material.

[0012] Optionally, the active switch layer comprises a first active switch and a second active switch.

[0013] The first control electrode is in a strip shape, and a gap is arranged between the head end and the tail end of the first control electrode, and the electronic paper display panel further comprises an electrode protruding segment, which is connected with the second control electrode and located in the gap.

[0014] The electronic paper display panel further comprises a first electrode connecting segment and a second electrode connecting segment, both of which are located on the side wall of the second light collimation layer, and the two ends of the first electrode connecting segment are connected with the first active switch and the first control electrode in sequence; the two ends of the second control electrode are connected with the electrode protruding segment and the second active switch.

[0015] Optionally, the electronic paper display panel further comprises a color resistance layer, which is arranged on the side of the ink layer away from the light reflection layer.

[0016] The application further discloses a preparation method of an electronic paper display panel, and the preparation method comprises the following steps:

[0017] forming an active switch layer on a first substrate;

[0018] forming a light reflection layer on the active switch layer;

[0019] forming a first control electrode and a second control electrode on the light reflection layer to form a control electrode layer;

[0020] forming a unidirectional light transmission film and an electrophoretic film on a second substrate;

[0021] assembling the second substrate and the first substrate, and making the control electrode layer adhere to the electrophoretic film to form the electronic paper display panel.

[0022] Optionally, the step of forming the unidirectional light transmission film and the electrophoretic film on the second substrate further comprises:

[0023] forming a first light collimating layer on the second substrate;

[0024] forming the unidirectional light transmission film on the first light collimating layer, and forming the electrophoretic film on the second substrate.

[0025] Optionally, the step of forming the first control electrode and the second control electrode on the light reflection layer to form a control electrode layer further comprises:

[0026] forming a second light collimating layer and a protection layer on the light reflection layer;

[0027] forming the first control electrode and the second control electrode on the second light collimating layer and the protection layer to form a control electrode layer;

[0028] wherein the orthographic projection of the second light collimating layer on the active switch layer covers the orthographic projection of the second control electrode on the active switch layer; and the orthographic projection of the second light collimating layer on the active switch layer also covers at least part of the orthographic projection of the first control electrode on the active switch layer; and the orthographic projection of the first control electrode on the active switch layer covers the orthographic projection of the protection layer on the active switch layer.

[0029] The application also discloses a display device, which comprises a driving circuit and the electronic paper display panel as described above, and the driving circuit is used for driving the electronic paper display panel to display a picture.

[0030] Compared with the prior art, the electronic paper display panel provided by the application sets the light reflection layer on the active switch layer, and then sets the unidirectional light transmission film and the electrophoretic film on the light reflection layer in a spaced manner, and the light can pass through the unidirectional light transmission film in the direction of the light regulation unit towards the active switch layer, and then is reflected on the light reflection layer to the electrophoretic film; when switched to the anti-peeping state, the ink in the ink layer is driven to move above the first control electrode by charging the first control electrode, so that the light of a large angle is reduced, and the anti-peeping display effect is realized; when switched to the sharing state, the ink in the ink layer is driven to move above the second control electrode by charging the second control electrode, so that the light of a large angle is avoided to be blocked, and the sharing display effect is realized, so that the switching between the anti-peeping state and the sharing state is realized on the basis of only one ink layer, and the thickness of the electronic paper display panel is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is to be understood that the drawings are solely for purposes of illustration and that they are not limiting of the application. In the drawings:

[0032] Figure 1 is a schematic diagram of a display device according to an embodiment of the present application;

[0033] Figure 2 is a schematic diagram of an electronic paper display panel according to a first embodiment of the present application;

[0034] Figure 3 is a plan view of a first electronic paper display panel according to the first embodiment of the present application;

[0035] Figure 4 is a plan view of a second electronic paper display panel according to the first embodiment of the present application;

[0036] Figure 5 is a plan view of a third electronic paper display panel according to the first embodiment of the present application;

[0037] Figure 6 is a schematic diagram of an electronic paper display panel according to a second embodiment of the present application;

[0038] Figure 7 is a plan view of a first control electrode and a second control electrode according to the first embodiment of the second embodiment of the present application;

[0039] Figure 8 is a cross-sectional view of a first electrode connecting section and a second electrode connecting section according to the first embodiment of the second embodiment of the present application;

[0040] Figure 9 is a plan view of a first control electrode and a second control electrode according to the second embodiment of the second embodiment of the present application;

[0041] Figure 10 is a cross-sectional view of a first electrode connecting section and a second electrode connecting section according to the second embodiment of the second embodiment of the present application;

[0042] Figure 11 is a cross-sectional view of a first transparent electrode and a second transparent electrode according to the second embodiment of the present application;

[0043] Figure 12 is a schematic diagram of a method for manufacturing a first electronic paper display panel according to an embodiment of the present application;

[0044] Figure 13 is a schematic diagram of a preparation method of a second electronic paper display panel of an embodiment of the present application.

[0045] wherein 10, display device; 20, driving circuit; 30, electronic paper display panel; 40, pixel unit region; 41, first region; 42, second region; 100, first substrate; 110, active switch layer; 111, first active switch; 112, second active switch; 120, light reflection layer; 121, reflection inclined surface; 130, transparent electrode layer; 131, first transparent electrode; 132, second transparent electrode; 200, light regulation unit; 210, unidirectional light transmission film; 220, first light collimation layer; 221, first sub-light refraction layer; 222, second sub-light refraction layer; 223, third sub-light refraction layer; 300, electrophoretic film; 400, control electrode layer; 410, first control electrode; 411, first sub-control electrode; 415, avoidance gap; 420, second control electrode; 421, electrode protruding section; 431, first electrode connecting section; 432, second electrode connecting section; 441, first sub-electrode connecting section; 451, second sub-electrode connecting section; 460, ink layer; 461, lower film sheet; 462, hydrophobic layer; 463, ink; 464, upper film sheet; 470, second light collimation layer; 471, fourth sub-light refraction layer; 472, fifth sub-light refraction layer; 473, sixth sub-light refraction layer; 480, protective layer; 510, support barrier wall; 520, color resistance layer; 530, common electrode; 600, second substrate; 711, electrode section avoidance notch. DETAILED DESCRIPTION

[0046] It is to be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting, but is intended to be representative of many alternative forms of implementation of the present application.

[0047] In the description of the present application, the terms "first", "second", etc. are used only for the purpose of description, and should not be interpreted as indicating relative importance or implying the number of the technical features indicated. Therefore, unless otherwise specified, the features defined with "first", "second" can explicitly or implicitly include one or more of the features; the meaning of "multiple" is two or more. The term "comprise" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof can exist or be added.

[0048] In addition, the terms indicating the orientation or positional relationship of "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are described based on the orientation or relative position relationship shown in the drawings, which is only for the convenience of description of the simplified description of the present application, and does not indicate 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 a limitation on the present application.

[0049] In addition, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0050] The present application will be described in detail below with reference to the drawings and optional embodiments.

[0051] Figure 1 is a schematic diagram of a display device according to an embodiment of the present application, as shown in Figure 1 The present application discloses a display device 10, which comprises a driving circuit 20 and an electronic paper display panel 30, wherein the driving circuit 20 is used to drive the electronic paper display panel 30 to display a picture.

[0052] The present application further discloses an electronic paper display panel 30, which can be used in the display device 10 described above, and the present application provides the following design for the electronic paper display panel 30.

[0053] Embodiment 1

[0054] Figure 2 is a schematic diagram of an electronic paper display panel according to a first embodiment of the present application, as shown in Figure 2 The present application discloses an electronic paper display panel 30, which comprises a pixel unit region 40, and the electronic paper display panel 30 comprises a first substrate 100, an active switch layer 110, a light reflection layer 120, a light control unit 200 and a second substrate 600, wherein the first substrate 100, the active switch layer 110, the light reflection layer 120, the light control unit 200 and the second substrate 600 are sequentially stacked.

[0055] The light regulation unit 200 comprises a unidirectional light transmission film 210 and an electrophoretic film 300, the unidirectional light transmission film 210 is arranged in a spaced manner with the electrophoretic film 300, and light can pass through the unidirectional light transmission film 210 in the direction of the light regulation unit 200 towards the active switch layer 110.

[0056] The electrophoretic film 300 comprises a control electrode layer 400 and an ink layer 460, the ink layer 460 is arranged on the side of the control electrode layer 400 away from the light reflection layer 120, the control electrode layer 400 comprises a first control electrode 410 and a second control electrode 420, and the first control electrode 410 is arranged around the second control electrode 420.

[0057] The ink layer 460 comprises a lower diaphragm 461, a hydrophobic layer 462, ink 463 and an upper diaphragm 464, which are arranged in sequence, and the position of the ink 463 is controlled by the first control electrode 410 and the second control electrode 420. The electronic paper display panel 30 can further comprise a common electrode 530 arranged on the side of the ink layer 460 away from the active switch layer 110.

[0058] The active switch layer 110 is used to control the charging of the first control electrode 410 and the charging of the second control electrode 420; when switched to a privacy state, the ink 463 in the ink layer 460 is driven to move above the first control electrode 410 by charging the first control electrode 410, thereby reducing the shielding of light at a large angle and achieving the effect of privacy display.

[0059] When switched to a sharing state, the ink 463 in the ink layer 460 is driven to move above the second control electrode 420 by charging the second control electrode 420, thereby avoiding the shielding of light at a large angle and achieving the effect of sharing display.

[0060] The unidirectional light transmission film 210 and the electrophoretic film 300 can be understood as being arranged in the same layer, and in a single pixel unit area 40, the area ratio of the unidirectional light transmission film 210 to the electrophoretic film 300 is between 1:4 and 1:2, thereby ensuring that each pixel unit area 40 has sufficient effective display area.

[0061] Compared with the existing electronic paper display panel scheme, the electronic paper display panel 30 of the present application sets the light reflection layer 120 on the active switch layer 110, then sets the unidirectional light transmission film 210 and the electrophoretic film 300 on the light reflection layer 120 at intervals, and the light rays can pass through the unidirectional light transmission film 210 along the light ray control unit 200 towards the direction of the active switch layer 110, then reflect on the light reflection layer 120 and then on the electrophoretic film 300.

[0062] When switching to the privacy state, by charging the first control electrode 410, the ink 463 in the ink layer 460 is driven to move above the first control electrode 410, thereby reducing the shielding of light at a large angle, achieving the effect of privacy display.

[0063] When switching to the sharing state, by charging the second control electrode 420, the ink 463 in the ink layer 460 is driven to move above the second control electrode 420, thereby avoiding the shielding of light at a large angle, achieving the effect of sharing display, so that on the basis of only setting one ink layer 460, the switching between the privacy state and the sharing state is realized, thereby reducing the thickness of the electronic paper display panel 30.

[0064] In the present embodiment, the active switch layer 110 includes a first active switch 111 and a second active switch 112; the first active switch 111 is connected to the first control electrode 410 through a via hole, and the second active switch 112 is connected to the second control electrode 420 through a via hole. In the present embodiment, the via hole penetrates the light reflection layer 120.

[0065] Figure 3 is a plan view of a first electronic paper display panel of the first embodiment of the present application, as Figure 3 shown, defining the area where the unidirectional light transmission film 210 is located as the first area 41; defining the area where the electrophoretic film 300 is located as the second area 42, the unidirectional light transmission film 210 and the electrophoretic film 300 can be distributed left and right in the single pixel unit area 40, that is, the first area 41 and the second area 42 are distributed left and right.

[0066] In the single pixel unit area 40, the unidirectional light transmission film 210 and the electrophoretic film 300 are distributed on the left and right sides, in order to avoid the problem of black lines appearing in the area corresponding to the unidirectional light transmission film 210 of the electronic paper display panel 30, in the odd-numbered row pixel unit area 40, the unidirectional light transmission film 210 is located on the left side of the electrophoretic film 300, that is, the first area 41 is located on the left side of the second area 42; in the even-numbered row pixel unit area 40, the unidirectional light transmission film 210 is located on the right side of the electrophoretic film 300, that is, the first area 41 is located on the right side of the second area 42; thereby the area of the unidirectional light transmission film 210 is staggered, avoiding the phenomenon of black lines appearing in the area corresponding to the unidirectional light transmission film 210 of the electronic paper display panel 30.

[0067] Figure 4 is a plan view of a second electronic paper display panel of the first embodiment of the present application, as shown in Figure 4 In order to further avoid the phenomenon of dark lines appearing in the area of the unidirectional light transmission film 210, the area where the unidirectional light transmission film 210 is located is defined as the first area 41; the area where the electrophoretic film 300 is located is defined as the second area 42; and two adjacent rows of pixel unit areas 40 are defined as a group.

[0068] In the odd-numbered row pixel unit area 40 of the odd-numbered group, the unidirectional light transmission film 210 is located on the left side of the electrophoretic film 300, that is, the first area 41 is located on the left side of the second area 42; in the odd-numbered row pixel unit area 40 of the odd-numbered column of the odd-numbered group, the unidirectional light transmission film 210 is located on the upper side of the electrophoretic film 300, that is, the first area 41 is located on the upper side of the second area 42; in the even-numbered row pixel unit area 40 of the even-numbered column of the odd-numbered group, the unidirectional light transmission film 210 is located on the lower side of the electrophoretic film 300, that is, the first area 41 is located on the lower side of the second area 42.

[0069] In the even-numbered row pixel unit area 40 of the even-numbered group, the unidirectional light transmission film 210 is located on the right side of the electrophoretic film 300, that is, the first area 41 is located on the right side of the second area 42; in the even-numbered row pixel unit area 40 of the odd-numbered column of the even-numbered group, the unidirectional light transmission film 210 is located on the upper side of the electrophoretic film 300, that is, the first area 41 is located on the upper side of the second area 42; in the even-numbered row pixel unit area 40 of the even-numbered column of the even-numbered group, the unidirectional light transmission film 210 is located on the lower side of the electrophoretic film 300, that is, the first area 41 is located on the lower side of the second area 42.

[0070] Therefore, the area of the unidirectional light transmission film 210 of the entire electronic display panel is staggered, avoiding the phenomenon of dark lines appearing in the area corresponding to the unidirectional light transmission film 210 of the electronic paper display panel 30.

[0071] Figure 5is a planar schematic view of a third electronic paper display panel of the first embodiment of the present application, as shown in the figure, the present application is explained and described by taking the example that the unidirectional light transmission film 210 is distributed around the electrophoretic film 300 in the single pixel unit area 40, so as to ensure that the unidirectional light transmission film 210 is arranged between the electrophoretic films 300 of any two adjacent pixel unit areas 40, thereby avoiding the phenomenon of light mixing between the two adjacent pixel unit areas 40; and the width of the unidirectional light transmission film 210 can be made smaller and the distribution can be made more uniform. Figure 5 As shown in the figure, the present application is explained and described by taking the example that the unidirectional light transmission film 210 is distributed around the electrophoretic film 300 in the single pixel unit area 40, so as to ensure that the unidirectional light transmission film 210 is arranged between the electrophoretic films 300 of any two adjacent pixel unit areas 40, thereby avoiding the phenomenon of light mixing between the two adjacent pixel unit areas 40; and the width of the unidirectional light transmission film 210 can be made smaller and the distribution can be made more uniform.

[0072] Referring again to Figure 2 , the electronic paper display panel 30 further comprises a first light collimation layer 220, the first light collimation layer 220 is arranged on the side of the unidirectional light transmission film 210 away from the light reflection layer 120; the light reflection layer 120 comprises a plurality of reflection inclined surfaces 121, the reflection inclined surfaces 121 are directed towards the electrophoretic film 300.

[0073] By arranging the reflection inclined surfaces 121 on the light reflection layer 120 and directing the reflection inclined surfaces 121 towards the electrophoretic film 300, the light rays falling from the first light collimation layer 220 and the unidirectional light transmission film 210 can be converged on the electrophoretic film 300 through the reflection of the reflection inclined surfaces 121, thereby improving the display effect of the electronic paper display panel 30.

[0074] Illustratively, the reflection inclined surfaces 121 are hemispherical arc surfaces, and each of the hemispherical arc surfaces is located in a pixel unit area 40, and the electrophoretic film 300 in each pixel unit area 40 is located at the center position of the pixel unit area 40. Through the reflection of the hemispherical arc surfaces, the light rays can be converged on the electrophoretic film 300, thereby further improving the display brightness and improving the display effect of the electronic paper display panel 30.

[0075] Illustratively, the first light collimation layer 220 comprises a first sub-light refraction layer 221, a second sub-light refraction layer 222 and a third sub-light refraction layer 223, the first sub-light refraction layer 221, the second sub-light refraction layer 222 and the third sub-light refraction layer 223 are sequentially stacked on the second substrate 600, and the refractive indices of the first sub-light refraction layer 221, the second sub-light refraction layer 222 and the third sub-light refraction layer 223 are sequentially increased.

[0076] The light ray control unit 200 further comprises a support barrier wall 510, the support barrier wall 510 is arranged on the side of the first light collimation layer 220 close to the electrophoretic film 300 and the side of the unidirectional light transmission film 210 close to the electrophoretic film 300; the material of the support barrier wall 510 is prepared from a material capable of reflecting light.

[0077] Thus, the external light can be prevented from being emitted from the sidewall of the first light collimating layer 220 when passing through the first light collimating layer 220, and the light utilization rate is improved.

[0078] Further, the color display effect can also be realized by arranging the color resist layer 520, that is, the electronic paper display panel 30 further comprises a color resist layer 520, which is arranged on the side of the ink layer 460 away from the light reflecting layer 120. The color resist layer 520 comprises a plurality of red color resist, green color resist and blue color resist, each of which corresponds to each electrophoretic film 300. The red color resist, green color resist and blue color resist filter the light from the electrophoretic film 300, thereby realizing the color display effect of the electronic paper display panel 30.

[0079] Embodiment 2:

[0080] Figure 6 is a schematic diagram of an electronic paper display panel according to a second embodiment of the present application. As shown in Figure 6 The difference between the present embodiment and the first embodiment is that the present embodiment is provided with a second light collimating layer 470 below the ink layer 460, and the second light collimating layer 470 can collimate the light reflected by the light reflecting layer 120 and then guide the light into the ink layer 460. Specifically:

[0081] The electronic paper display panel 30 further comprises a second light collimating layer 470 and a protective layer 480, the second light collimating layer 470 and the protective layer 480 are arranged in the same layer, and the second light collimating layer 470 and the protective layer 480 are located on the side of the control electrode layer 400 close to the light reflecting layer 120.

[0082] The orthographic projection of the second light collimating layer 470 on the active switch layer 110 covers the orthographic projection of the second control electrode 420 on the active switch layer 110; and the orthographic projection of the second light collimating layer 470 on the active switch layer 110 also covers at least part of the orthographic projection of the first control electrode 410 on the active switch layer 110; and the orthographic projection of the first control electrode 410 on the active switch layer 110 covers the orthographic projection of the protective layer 480 on the active switch layer 110. In other words, the area of the second light collimating layer 470 is larger than the area of the second control electrode 420, and the part of the second control electrode 420 close to the first control electrode 410 overlaps with the orthographic projection of the second light collimating layer 470.

[0083] Compared with the scheme of the first embodiment, the second embodiment is characterized in that a second light collimating layer 470 is arranged below the ink layer 460, and the second light collimating layer 470 covers the second control electrode 420 in orthographic projection, and the second light collimating layer 470 covers the part of the first control electrode 410 close to the second control electrode 420 in orthographic projection.

[0084] When switching to the privacy state, the ink 463 in the ink layer 460 is driven to move above the first control electrode 410 by charging the first control electrode 410, and the inner circle of the ink 463 covers the outer circle of the second light collimating layer 470, so that the light rays of large angles are blocked, the privacy display effect is achieved, and the area of the inner circle of the ink 463 covering the outer circle of the second light collimating layer 470 can be adjusted by controlling the voltage of the first control electrode 410, so that the change of the privacy ability does not occur on the basis of the gray scale control.

[0085] In other words, when switching to the privacy state, the ink 463 in the ink layer 460 is driven to move above the first control electrode 410 by charging the first control electrode 410, and the inner circle of the ink 463 covers the outer circle of the second light collimating layer 470, so that the light rays from the light reflection layer 120 can only be emitted out through the second light collimating layer 470, and the amount of light emitted out of the second light collimating layer 470 can be adjusted by adjusting the area of the inner circle of the ink 463 covering the outer circle of the second light collimating layer 470, so that the gray scale adjustment is achieved, and the light rays of large angles do not occur when high gray scale display is needed, and the decline of the privacy effect is avoided when high gray scale display is needed.

[0086] For example, the second light collimating layer 470 includes a fourth sub-light refraction layer 471, a fifth sub-light refraction layer 472, and a sixth sub-light refraction layer 473, the fourth sub-light refraction layer 471, the fifth sub-light refraction layer 472, and the sixth sub-light refraction layer 473 are sequentially stacked on the light reflection layer 120, and the refractive indexes of the fourth sub-light refraction layer 471, the fifth sub-light refraction layer 472, and the sixth sub-light refraction layer 473 gradually increase.

[0087] The sum of the thickness of the second light collimating layer 470, the thickness of the control electrode layer 400, the thickness of the ink layer 460, and the thickness of the color resistance layer 520 is equal to the sum of the thickness of the first light collimating layer 220 and the thickness of the unidirectional light transmission film 210.

[0088] Figure 7 is a schematic view of the planes of the first control electrode and the second control electrode of the second embodiment of the present application, Figure 8is a schematic view of a cross section of the first electrode connecting section and the second electrode connecting section of the second embodiment of the present application, in combination with Figures 6-8 In the present embodiment, since the light reflection layer 120, the second light collimation layer 470 and the protective layer 480 are arranged between the control electrode layer 400 and the active switch layer 110, the first electrode connecting section 431 is further arranged on the second light collimation layer 470 to connect the first active switch 111 and the first control electrode 410, and the second electrode connecting section 432 is arranged to connect the second active switch 112 and the second control electrode 420.

[0089] The active switch layer 110 includes the first active switch 111 and the second active switch 112; the first control electrode 410 is in a strip shape, and a gap 415 is arranged between the head end and the tail end of the first control electrode 410; the electronic paper display panel 30 further includes an electrode protruding section 421, which is connected with the second control electrode 420 and located in the gap 415.

[0090] The electronic paper display panel 30 further includes the first electrode connecting section 431 and the second electrode connecting section 432, which are both arranged on the sidewall of the second light collimation layer 470; the two ends of the first electrode connecting section 431 are connected with the first active switch 111 and the first control electrode 410 in sequence; the two ends of the second control electrode 420 are connected with the electrode protruding section 421 and the second active switch 112.

[0091] In the present embodiment, the gap 415 is arranged between the head end and the tail end of the first control electrode 410, and the electrode protruding section 421 is used to lead out the second control electrode 420 surrounded by the first control electrode 410, so that the via hole is not arranged in the second light collimation layer 470 and the collimation function of the second light collimation layer 470 is not damaged.

[0092] The first electrode connecting section 431 and the second electrode connecting section 432 can be made of metal light reflection material; when the first electrode connecting section 431 and the second electrode connecting section 432 are made of metal light reflection material, the first electrode connecting section 431 semi-surrounds the sidewall of the second light collimation layer 470, and the gap 711 is arranged between the head end and the tail end of the first electrode connecting section 431; the second electrode connecting section 432 is located in the gap 711, so that the stability of the connection between the first electrode connecting section 431 and the first control electrode 410 is ensured, and the light in the second light collimation layer 470 cannot be emitted from the sidewall, so that the light utilization rate is improved.

[0093] Figure 9 is a schematic view of a second planar view of a first control electrode and a second control electrode of a second embodiment of the present application, Figure 10 is a schematic view of a second cross-sectional view of a first electrode connecting section and a second electrode connecting section of the second embodiment of the present application, Figure 11 is a schematic view of a second cross-sectional view of a first transparent electrode and a second transparent electrode of the second embodiment of the present application, in combination with Figure 6 , Figure 9 , Figure 10 , Figure 11 As shown in FIG. 5, in order to avoid the disconnection of the second active switch 112 and the second control electrode 420, the first control electrode 410 is provided in multiple sections, specifically:

[0094] The active switch layer 110 includes a first active switch 111 and a second active switch 112; the first control electrode 410 includes four first sub-control electrodes 411, and the four first sub-control electrodes 411 are located at the periphery of the second control electrode 420, and an avoidance gap 415 is provided between adjacent two first sub-control electrodes 411.

[0095] The electronic paper display panel 30 further includes four electrode protruding sections 421, and the four electrode protruding sections 421 are connected with the second control electrode 420, and each electrode protruding section 421 is located in each avoidance gap 415.

[0096] The electronic paper display panel 30 further includes four first sub-electrode connecting sections 441 and four second sub-electrode connecting sections 451, and the four first sub-electrode connecting sections 441 and the four second sub-electrode connecting sections 451 are arranged in intervals and surround the side wall of the second collimating layer.

[0097] The electronic paper display panel 30 further includes a transparent electrode layer 130, and the transparent electrode layer 130 includes a first transparent electrode 131 and a second transparent electrode 132, the first transparent electrode 131 and the second transparent electrode 132 are arranged on the light reflection layer 120, the first transparent electrode 131 is connected with the four first sub-electrode connecting sections 441; and the first transparent electrode 131 is connected with the first active switch 111 through a via hole.

[0098] The second transparent electrode 132 is connected with the four second sub-electrode connecting sections 451; and the second transparent electrode 132 is connected with the second active switch 112 through a via hole.

[0099] The first sub-electrode connecting section 441 and the second sub-electrode connecting section 451 are made of metal light-reflecting material, which can ensure the stability of the connection between the first active switch 111 and the first control electrode 410 and the stability of the connection between the second active switch 112 and the second control electrode 420, and can also ensure that the light in the second light collimation layer 470 will not be emitted from the side wall, thereby improving the light utilization rate.

[0100] The first control electrode 410 is divided into four first sub-control electrodes 411, which can make the width of the avoidance gap 415 smaller and the width of the electrode protruding section 421 smaller, so that the ink 463 will not be disconnected at the position corresponding to the avoidance gap 415 when moving to the top of the first control electrode 410, thereby improving the anti-peeping effect.

[0101] Figure 12 is a schematic diagram of a preparation method of a first electronic paper display panel of an embodiment of the present application, as Figure 12 The present application discloses a preparation method of an electronic paper display panel 30, which comprises the following steps:

[0102] S1: forming an active switch layer on a first substrate;

[0103] S2: forming a light reflection layer on the active switch layer;

[0104] S3: forming a first control electrode and a second control electrode on the light reflection layer to form a control electrode layer;

[0105] S4: forming a unidirectional light transmission film and an electrophoretic film on a second substrate;

[0106] S5: setting the second substrate and the first substrate in a lamination mode, and making the control electrode layer adhere to the electrophoretic film to form the electronic paper display panel.

[0107] Compared with the existing preparation method of the electronic paper display panel, the electronic paper display panel 30 prepared by the preparation method of the electronic paper display panel 30 of the present application is prepared by setting the light reflection layer 120 on the active switch layer 110, then setting the unidirectional light transmission film 210 and the electrophoretic film 300 on the light reflection layer 120 in a spaced mode, and the light can pass through the unidirectional light transmission film 210 in the direction of the light control unit 200 towards the active switch layer 110, and then be reflected on the light reflection layer 120 to the electrophoretic film 300.

[0108] When switching to the privacy state, by charging the first control electrode 410, the ink 463 in the ink layer 460 is driven to move above the first control electrode 410, thereby reducing the shielding of light at a large angle, achieving the effect of privacy display.

[0109] When switching to the sharing state, by charging the second control electrode 420, the ink 463 in the ink layer 460 is driven to move above the second control electrode 420, thereby avoiding the shielding of light at a large angle, achieving the effect of sharing display, so that on the basis of only one ink layer 460 being provided, the switching between the privacy state and the sharing state is achieved, thereby reducing the thickness of the electronic paper display panel 30.

[0110] The S2: the step of forming the light reflection layer on the active switching layer comprises:

[0111] S21: forming a first passivation layer on the active switching layer;

[0112] S22: forming a plurality of hemispherical inner grooves on the first passivation layer;

[0113] S23: disposing a light reflection material on the first passivation layer to form a hemispherical arc surface reflection slope;

[0114] S24: forming a second passivation layer on the first passivation layer to form a light reflection layer.

[0115] The S4: the step of forming the unidirectional light transmission film and the electrophoretic film on the second substrate further comprises:

[0116] S41: forming a first light collimation layer on the second substrate;

[0117] S42: forming a unidirectional light transmission film on the first light collimation layer, and forming an electrophoretic film on the second substrate.

[0118] The first light collimation layer 220 on the second substrate 600 and the unidirectional light transmission film 210 on the second substrate 600 are coincident in orthographic projection, the reflection slope 121 is a hemispherical arc surface, and each hemispherical arc surface is located in a pixel unit area 40, and the electrophoretic film 300 in each pixel unit area 40 is located at the center position of the pixel unit area 40, and the reflection of the hemispherical arc surface can converge light on the electrophoretic film 300, thereby further improving the display brightness, thereby improving the display effect of the electronic paper display panel 30.

[0119] Figure 13 is a schematic diagram of a second method for manufacturing an electronic paper display panel according to an embodiment of the present application, and Figure 13Different from the preparation method of the first electronic paper display panel 30, the step of forming the first control electrode and the second control electrode on the light reflection layer to form the control electrode layer further comprises:

[0120] S31: forming a second light collimating layer and a protective layer on the light reflection layer;

[0121] S32: forming a first control electrode and a second control electrode on the second light collimating layer and the protective layer to form a control electrode layer;

[0122] The orthographic projection of the second light collimating layer 470 on the active switch layer 110 covers the orthographic projection of the second control electrode 420 on the active switch layer 110; and the orthographic projection of the second light collimating layer 470 on the active switch layer 110 also covers at least part of the orthographic projection of the first control electrode 410 on the active switch layer 110; and the orthographic projection of the first control electrode 410 on the active switch layer 110 covers the orthographic projection of the protective layer 480 on the active switch layer 110.

[0123] By arranging the second light collimating layer 470 below the ink layer 460, and the orthographic projection of the second light collimating layer 470 covering the orthographic projection of the second control electrode 420, and the orthographic projection of the second light collimating layer 470 covering the orthographic projection of the part of the first control electrode 410 close to the second control electrode 420, when switched to the anti-peeping state, the ink 463 in the ink layer 460 is driven to move above the first control electrode 410 by charging the first control electrode 410, and the inner circle of the ink 463 covers the outer circle of the second light collimating layer 470, so that the light of a large angle is reduced, the effect of anti-peeping display is realized, and the area of the inner circle of the ink 463 covering the outer circle of the second light collimating layer 470 can be adjusted by controlling the voltage of the first control electrode 410, so that the change of the anti-peeping ability is not caused on the basis of realizing the gray scale control.

[0124] It should be noted that the steps involved in the present scheme are not limited to the order of execution, and the steps written in the front can be executed first, or executed later, or even executed simultaneously, as long as the present scheme can be implemented, which should be considered as belonging to the protection scope of the present application.

[0125] It should be noted that the inventive concept of the present application can form a very large number of embodiments, but the length of the application file is limited and cannot be listed one by one, therefore, on the premise of not conflicting, the above-described embodiments or technical features can be combined to form new embodiments, and the combination of the embodiments or technical features will enhance the original technical effect.

[0126] The above further describes the present application in detail with reference to specific optional embodiments. It is not to be understood that the present application is limited to these embodiments. Any person skilled in the art to which the present application pertains can make several simple deductions or replacements without departing from the concept of the present application, and all of these should be considered to fall within the scope of protection of the present application.

Claims

1. An electronic paper display panel, characterized in that, The electronic paper display panel includes a pixel unit area, and the electronic paper display panel includes a first substrate, an active switching layer, a light reflection layer, a light control unit, and a second substrate, wherein the first substrate, the active switching layer, the light reflection layer, the light control unit, and the second substrate are stacked sequentially. The light control unit includes a one-way light-transmitting membrane and an electrophoretic membrane. The one-way light-transmitting membrane and the electrophoretic membrane are spaced apart. Light can pass through the one-way light-transmitting membrane along the direction of the light control unit toward the active switching layer. The electrophoretic membrane includes a control electrode layer and an ink layer. The ink layer is disposed on the side of the control electrode layer opposite to the light-reflecting layer. The control electrode layer includes a first control electrode and a second control electrode, with the first control electrode surrounding the second control electrode.

2. The electronic paper display panel according to claim 1, characterized in that, The electronic paper display panel further includes a first light collimation layer, which is disposed on the side of the unidirectional light-transmitting film away from the light-reflecting layer; the light-reflecting layer includes a plurality of reflective slopes, which face the electrophoretic film.

3. The electronic paper display panel according to claim 2, characterized in that, The electronic paper display panel further includes a second light collimation layer and a protective layer, the second light collimation layer and the protective layer being disposed in the same layer, and the second light collimation layer and the protective layer being located on the side of the control electrode layer near the light reflection layer; The orthographic projection of the second optical collimating layer on the active switching layer covers the orthographic projection of the second control electrode on the active switching layer; and the orthographic projection of the second optical collimating layer on the active switching layer also covers at least a portion of the orthographic projection of the first control electrode on the active switching layer; The orthographic projection of the first control electrode on the active switching layer overlaps the orthographic projection of the protective layer on the active switching layer.

4. The electronic paper display panel according to claim 3, characterized in that, The light control unit further includes a support barrier wall, which is disposed on the side of the first light collimation layer near the electrophoretic membrane and on the side of the one-way light-transmitting membrane near the electrophoretic membrane; the support barrier wall is made of a light-reflective material.

5. The electronic paper display panel according to claim 3, characterized in that, The active switch layer includes a first active switch and a second active switch; The first control electrode is elongated and a clearance gap is provided between its first and last ends. The electronic paper display panel also includes an electrode protrusion section, which is connected to the second control electrode and is located within the clearance gap. The electronic paper display panel further includes a first electrode connection segment and a second electrode connection segment. Both the first electrode connection segment and the second electrode connection segment are located on the sidewall of the second optical collimation layer. The two ends of the first electrode connection segment are sequentially connected to the first active switch and the first control electrode, respectively. The two ends of the second electrode connection segment are connected to the electrode protrusion segment and the second active switch, respectively.

6. The electronic paper display panel according to claim 1, characterized in that, The electronic paper display panel also includes a color resist layer, which is disposed on the side of the ink layer opposite to the light reflective layer.

7. A method for preparing an electronic paper display panel as described in any one of claims 1-6, characterized in that, The method for preparing the electronic paper display panel includes the following steps: An active switching layer is formed on the first substrate; A light-reflecting layer is formed on the active switching layer; A first control electrode and a second control electrode are formed on the light-reflecting layer to form a control electrode layer; A one-way light-transmitting film and an ink layer are formed on a second substrate; The second substrate and the first substrate are aligned and the control electrode layer is attached to the ink layer to form the electronic paper display panel.

8. The method for preparing an electronic paper display panel according to claim 7, characterized in that, The step of forming the unidirectional light-transmitting film and ink layer on the second substrate further includes: A first optical collimation layer is formed on the second substrate; A unidirectional light-transmitting film is formed on the first light collimation layer, and an ink layer is formed on the second substrate.

9. The method for preparing an electronic paper display panel according to claim 7, characterized in that, The step of forming a first control electrode and a second control electrode on the light-reflecting layer to form a control electrode layer further includes: A second light collimation layer and a protective layer are formed on the light-reflecting layer; A first control electrode and a second control electrode are formed on the second optical collimation layer and the protective layer to form a control electrode layer; Wherein, the orthographic projection of the second optical collimating layer on the active switching layer covers the orthographic projection of the second control electrode on the active switching layer; and the orthographic projection of the second optical collimating layer on the active switching layer also covers at least a portion of the orthographic projection of the first control electrode on the active switching layer; and the orthographic projection of the first control electrode on the active switching layer covers the orthographic projection of the protective layer on the active switching layer.

10. A display device, characterized in that, The display device includes a driving circuit and an electronic paper display panel as described in any one of claims 1-6, wherein the driving circuit is used to drive the electronic paper display panel to display an image.

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