Electronic paper display panel and display device

Abstract

This application discloses an electronic paper display panel and a display device. The electronic paper display panel includes at least two sets of viewing angle electrodes, a hydrophobic layer, ink, a conductive solution, a reflective layer, and at least two control electrodes. The at least two sets of viewing angle electrodes are simultaneously disposed in each pixel. Different viewing angle electrodes are arranged side by side and are not connected, and the different viewing angle electrodes face different viewing angles of the electronic paper display panel. The hydrophobic layer is disposed on the viewing angle electrodes, the ink is disposed on the hydrophobic layer, the conductive solution is disposed on the ink, and the reflective layer is disposed on the side of the viewing angle electrode away from the hydrophobic layer for reflecting light. The at least two control electrodes are respectively connected to the at least two sets of viewing angle electrodes for controlling the voltage of the corresponding viewing angle electrodes. Through the above design, differentiated content display can be achieved at different viewing angles.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to an electronic paper display panel and display device. Background Technology

[0002] With the rapid development of display devices, their applications are becoming increasingly widespread. Electronic paper, as one type of display device, is widely favored by the public due to its significant advantages in saving ecological resources, as well as its outstanding advantages such as ultra-low power consumption, thinness and portability, and long service life.

[0003] However, current e-paper display panels offer limited display options and struggle to present differentiated content from various viewing angles, thus failing to meet the needs of a wide range of users. Summary of the Invention

[0004] The purpose of this application is to provide an electronic paper display panel and display device to achieve differentiated content display from different viewing angles.

[0005] This application discloses an electronic paper display panel, which includes at least two sets of viewing angle electrodes, a hydrophobic layer, ink, a conductive solution, a reflective layer, and at least two control electrodes. The at least two sets of viewing angle electrodes are simultaneously disposed in each pixel. Different viewing angle electrodes are arranged side by side and are not connected, and different viewing angle electrodes face different viewing angles of the electronic paper display panel. The hydrophobic layer is disposed on the side of the viewing angle electrode facing the light-emitting surface of the electronic paper display panel. The ink is disposed on the side of the hydrophobic layer away from the viewing angle electrode. The conductive solution is disposed on the ink. The reflective layer is disposed on the side of the viewing angle electrode away from the hydrophobic layer and is used to reflect light. The at least two control electrodes are respectively connected to the at least two sets of viewing angle electrodes and are used to control the voltage of the corresponding viewing angle electrode.

[0006] Optionally, the electronic paper display panel includes three sets of viewing angle electrodes, namely a first viewing angle electrode, a second viewing angle electrode, and a third viewing angle electrode. The first viewing angle electrode, the second viewing angle electrode, and the third viewing angle electrode are simultaneously disposed in each pixel. In each pixel, the second viewing angle electrode and the third viewing angle electrode are respectively located on both sides of the first viewing angle electrode. The first viewing angle electrode faces the frontal viewing angle of the electronic paper display panel, the second viewing angle electrode faces the left viewing angle of the electronic paper display panel, and the third viewing angle electrode faces the right viewing angle of the electronic paper display panel.

[0007] Optionally, the electronic paper display panel includes a first substrate, a first control electrode, a shaping layer, a second substrate, a second control electrode, and a third control electrode. The first control electrode is disposed on the first substrate, the shaping layer is disposed on the first control electrode, and the shaping layer has a plurality of inverted trapezoidal grooves that pass through the shaping layer. A first viewing angle electrode is disposed at the bottom of the inverted trapezoidal groove and connected to the first control electrode. A second viewing angle electrode is disposed on at least one sidewall of the inverted trapezoidal groove, and a third viewing angle electrode is disposed on at least the other sidewall of the inverted trapezoidal groove. The second substrate is disposed opposite to the first substrate, the second control electrode is disposed on the side of the second substrate facing the first substrate and connected to the second viewing angle electrode, and the second control electrode abuts against the top of the shaping layer. The third control electrode is disposed on the side of the second substrate facing the first substrate and connected to the third viewing angle electrode, and the third control electrode abuts against the top of the shaping layer.

[0008] Optionally, a portion of the second viewing angle electrode is disposed on the top of the shaping layer and is attached to and connected to the second control electrode; a portion of the third viewing angle electrode is disposed on the top of the shaping layer and is attached to and connected to the third control electrode.

[0009] Optionally, the ink is made of a black material, the shaping layer is made of a white material, and the shaping layer and the reflective layer are an integral structure.

[0010] Optionally, the electronic paper display panel further includes a black matrix layer disposed on the side of the second substrate facing the first substrate; the black matrix layer includes a plurality of spaced black matrix blocks, the orthographic projection of the black matrix blocks on the first substrate covers the orthographic projection of the gap between the second viewing angle electrode and the third viewing angle electrode on the first substrate, as well as the orthographic projection of the second viewing angle electrode and the third viewing angle electrode on the first substrate.

[0011] Optionally, a first gap exists between the second viewing angle electrode and the first viewing angle electrode, the first gap being located at the junction of the bottom of the inverted trapezoidal groove and one side wall; a second gap exists between the third viewing angle electrode and the first viewing angle electrode, the second gap being located at the junction of the bottom of the inverted trapezoidal groove and another side wall; the ink storage area is located above the first gap and the second gap.

[0012] Optionally, the electronic paper display panel further includes color resist, wherein in the same pixel, a color resist of the same color is disposed between the viewing angle electrode and the reflective layer, and the color resist colors in three adjacent pixels are different.

[0013] Optionally, the electronic paper display panel further includes a rotating component connected to the viewing angle electrode for adjusting the angle of the viewing angle electrode.

[0014] This application also discloses a display device, which includes a driving circuit and an electronic paper display panel as described above. The driving circuit is electrically connected to the electronic paper display panel and is used to drive the electronic paper display panel.

[0015] The beneficial effects of this application embodiment are as follows: Compared to electronic paper display panels that can only display a single image from each viewing angle, this application embodiment sets at least two viewing angle electrodes facing different viewing angles in each pixel. By disconnecting these viewing angle electrodes and independently controlling them through control electrodes, each viewing angle electrode can be individually applied with a different voltage, thereby achieving different image displays. Taking black ink as an example, when a certain viewing angle electrode is in a voltage-free state, the hydrophobic layer provides surface tension, and the conductive solution repels the hydrophobic layer. According to the principle of "like dissolves like," the ink above the viewing angle electrode is attracted to the hydrophobic layer and spreads into a continuous film on the surface of the hydrophobic layer, covering the reflective layer below the viewing angle electrode, so that the image at the viewing angle corresponding to the viewing angle electrode displays black. When a voltage is applied to a certain viewing angle electrode, the hydrophobic layer above it temporarily changes from a hydrophobic state to a hydrophilic state. The ink is repelled to a designed corner by the equally hydrophilic conductive solution. That is, the voltage changes the contact angle between the ink above the viewing angle electrode and the hydrophobic layer, causing the ink to shrink and leak out of the reflective layer below the viewing angle electrode, so that the image at the viewing angle electrode corresponding to the viewing angle electrode displays white. Therefore, this design enables the electronic paper display panel to display different content from different viewing angles, thus enabling the electronic paper display panel to achieve the function of displaying different content from multiple viewing angles. Attached Figure Description

[0016] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings: Figure 1 This is a schematic diagram of a three-view electronic paper display panel provided in the first embodiment of this application; Figure 2 This is a schematic diagram of a first type of two-view electronic paper display panel provided in the first embodiment of this application; Figure 3 This is a schematic diagram of a second type of two-view electronic paper display panel provided in the first embodiment of this application; Figure 4 This is a schematic diagram of a third type of two-view electronic paper display panel provided in the first embodiment of this application; Figure 5 This is a schematic diagram of a color electronic paper display panel provided in the first embodiment of this application; Figure 6 This is a schematic diagram of an electronic paper display panel provided in the first embodiment of this application; Figure 7 This is a schematic diagram showing the distribution of a second control electrode and a third control electrode according to the first embodiment of this application; Figure 8 This is a schematic diagram of an electronic paper display panel incorporating a black matrix, provided in the first embodiment of this application; Figure 9 This is a schematic diagram of a perspective provided in the first embodiment of this application; Figure 10 This is a schematic diagram of an ink temporary storage area design provided in the first embodiment of this application; Figure 11 This is a schematic diagram of an electronic paper display panel incorporating a rotating component, provided in the first embodiment of this application; Figure 12 This is a schematic diagram of a display device provided in the second embodiment of this application.

[0017] Among them, 10 is a display device; 20 is an electronic paper display panel; 21 is a red color resist; 22 is a green color resist; 23 is a blue color resist; 30 is a driving circuit; 100 is a first substrate; 110 is a molding layer; 111 is an inverted trapezoidal groove; 120 is a viewing angle electrode; 121 is a first viewing angle electrode; 122 is a second viewing angle electrode; 123 is a third viewing angle electrode; 124 is a first gap; 125 is a second gap; 130 is a hydrophobic layer; 140 is ink; 15 is... 0. Conductive solution; 160. Reflective layer; 200. Second substrate; 210. Control electrode; 211. First control electrode; 212. Second control electrode; 213. Third control electrode; 220. Black matrix layer; 221. Black matrix block; 300. Rotating assembly; 310. Controller; 320. First support plate; 330. Second support plate; 340. Third support plate; 350. First link; 360. Second link; 370. Third link. Detailed Implementation

[0018] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0019] Furthermore, unless otherwise explicitly specified and limited, "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0020] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0021] like Figures 1-5 As shown, an electronic paper display panel 20 provided in the first embodiment of this application is an electrowetting electronic paper, including at least two sets of viewing angle electrodes 120, a hydrophobic layer 130, ink 140, a conductive solution 150, a reflective layer 160, and at least two control electrodes 210. The at least two sets of viewing angle electrodes 120 are simultaneously disposed in each pixel. Different viewing angle electrodes 120 are arranged side by side and are not connected, and different viewing angle electrodes 120 face different viewing angles of the electronic paper display panel 20; the hydrophobic layer The viewing angle electrode 120 is disposed on the side facing the light-emitting surface of the electronic paper display panel 20. The ink 140 is disposed on the side of the hydrophobic layer 130 away from the viewing angle electrode 120. The conductive solution 150 is disposed on the ink 140. The reflective layer 160 is disposed on the side of the viewing angle electrode 120 away from the hydrophobic layer 130 and is used to reflect light. The at least two control electrodes 210 are respectively connected to the at least two sets of viewing angle electrodes 120 and are used to control the voltage of the corresponding viewing angle electrode 120.

[0022] Understandably, when a display panel displays an image, the content can be seen from both the front and sides of the panel. The viewing angle from the front of the panel is called the frontal viewing angle, and the viewing angle from the sides is called the side viewing angle (which can also be further called the left or right viewing angle). In this embodiment, the phrase "different viewing angles of the different viewing angle electrodes 120 toward the electronic paper display panel 20" refers to the different angles of the electrodes 120 and the different directions they face. For example, if a viewing angle electrode 120 faces the frontal viewing angle of the electronic paper display panel 20, then the plane containing that electrode 120 faces the frontal viewing angle; if a viewing angle electrode 120 faces the left viewing angle of the electronic paper display panel 20, then the plane containing that electrode 120 faces the left viewing angle.

[0023] Compared to the electronic paper display panel 20, which can only display a single image from each viewing angle, this embodiment of the application provides at least two viewing angle electrodes 120 facing different viewing angles in each pixel. By disconnecting these viewing angle electrodes 120 and independently controlling them through the control electrode 210, each viewing angle electrode 120 can be individually subjected to different voltages, thereby achieving different image displays. Taking black ink 140 as an example, when a certain viewing angle electrode 120 is in a voltage-free state, the hydrophobic layer 130 provides surface tension, and the conductive solution 150 repels the hydrophobic layer 130. According to the principle of "like dissolves like," the ink 140 above the viewing angle electrode 120 is attracted to the hydrophobic layer 130 and spreads into a continuous film on the surface of the hydrophobic layer 130, covering the reflective layer 160 below the viewing angle electrode 120, so that the image at the viewing angle corresponding to the viewing angle electrode 120 is displayed in black. When a voltage is applied to a viewing angle electrode 120, the hydrophobic layer 130 above it temporarily changes from a hydrophobic state to a hydrophilic state. The ink 140 is repelled to a pre-designed corner by the equally hydrophilic conductive solution 150. In other words, the voltage changes the contact angle between the ink 140 and the hydrophobic layer 130 above the viewing angle electrode 120, causing the ink 140 to shrink and exposing the reflective layer 160 below the viewing angle electrode 120. This results in the image displayed at the viewing angle corresponding to the viewing angle electrode 120 appearing white. Therefore, this design allows the electronic paper display panel 20 to display different content from different viewing angles, enabling it to achieve multi-viewpoint display of different content.

[0024] Furthermore, this embodiment of the application can also switch between anti-peeping mode and sharing mode, as well as between different anti-peeping modes. Specifically, when it is necessary to display content from only a specific viewing angle, voltage can be applied only to the viewing angle electrode 120 corresponding to that viewing angle by controlling electrode 210, causing the ink 140 above the viewing angle electrode 120 to shrink, thereby exposing the reflective layer 160 below, so that the area can appear white. Other viewing angles, because no voltage is applied to the viewing angle electrode 120, have ink 140 covering the reflective layer 160, making that area appear black. At this time, only the corresponding viewing angle can see the displayed content, while other viewing angles appear black, achieving the anti-peeping effect. When multiple viewing angles need to share the displayed content, voltage can be applied to multiple viewing angle electrodes 120 simultaneously, causing the ink 140 in these viewing angle electrode 120 areas to shrink, and the exposed reflective layer 160 to jointly present the display image, thus allowing users from different viewing angles to see the displayed content, meeting the sharing requirements. Based on the same principle, the electronic paper display panel 20 can be controlled to display the image only at a specific viewing angle according to different viewing angle requirements, and can also switch to other specific viewing angles as needed, thereby realizing the switching between different privacy modes. Therefore, the electronic paper display panel 20 using the embodiments of this application further improves the practicality and applicable scenarios of the electronic paper display panel 20.

[0025] As can be understood, the application of voltage to the viewing angle electrode 120 by the control electrode 210, which causes the area corresponding to the viewing angle electrode 120 to appear white and thus display content, does not mean that the area corresponding to the viewing angle electrode 120 in each pixel must be displayed white. Rather, it means that the area corresponding to each viewing angle electrode 120 in each pixel can be displayed as white or black under the action of the control electrode 210, and can be combined into a complete display image as needed.

[0026] In some embodiments, the electronic paper display panel 20 can display different images from three viewing angles: a center viewing angle, a left viewing angle, and a right viewing angle. Specifically, as shown below... Figure 1 As shown, the electronic paper display panel 20 includes three sets of viewing angle electrodes 120, namely a first viewing angle electrode 121, a second viewing angle electrode 122 and a third viewing angle electrode 123. The three viewing angle electrodes 120 are arrayed in each pixel.

[0027] In each pixel, the first viewing angle electrode 121 is parallel to the light-emitting surface of the electronic paper display panel 20. The second viewing angle electrode 122 and the third viewing angle electrode 123 are located on both sides of the first viewing angle electrode 121. The angle between the second viewing angle electrode 122 and the first viewing angle electrode 121 is an obtuse angle, and the angle between the third viewing angle electrode 123 and the first viewing angle electrode 121 is an obtuse angle. Any two viewing angle electrodes 120 among the first viewing angle electrode 121, the second viewing angle electrode 122, and the third viewing angle electrode 123 are not connected. The first viewing angle electrode 121 faces the frontal viewing angle of the electronic paper display panel 20, the second viewing angle electrode 122 faces the left viewing angle of the electronic paper display panel 20, and the third viewing angle electrode 123 faces the right viewing angle of the electronic paper display panel 20.

[0028] This embodiment of the application sets three sets of viewing angle electrodes 120, each of which can be controlled independently, thereby enabling the display of different images from three different viewing angles. This allows different display content to be seen when looking at the electronic paper display panel 20 from the front, left, and right sides. In electronic paper applications such as billboards, bus stop signs, and labels, multiple images can be seen without adding a display panel. This reduces the cost of the display panel while enriching the display content, and also avoids the problem of an excessively large display panel size that occupies too much space when displaying multiple contents.

[0029] In other embodiments, the electronic paper display panel 20 can display different images from two viewing angles: a central viewing angle and a left viewing angle. Specifically, such as... Figure 2 As shown, the electronic paper display panel 20 includes a first viewing angle electrode 121 and a second viewing angle electrode 122. Both the first and second viewing angle electrodes 121 and 122 are arrayed in each pixel. In each pixel, the second viewing angle electrode 122 is located to the right of the first viewing angle electrode 121, and the angle between the second and first viewing angle electrodes 121 is obtuse. The first and second viewing angle electrodes 121 are not connected. The first viewing angle electrode 121 faces the frontal viewing angle of the electronic paper display panel 20, and the second viewing angle electrode 122 faces the left viewing angle of the electronic paper display panel 20. The electronic paper display panel 20 in this embodiment can achieve different image displays from the left and center viewing angles, and can also enrich the display content while reducing the cost of the display panel, meeting the diverse needs of users.

[0030] In other embodiments, the electronic paper display panel 20 can display different images from two viewing angles: a central viewing angle and a right viewing angle. Specifically, such as... Figure 3 As shown, the electronic paper display panel 20 includes a first viewing angle electrode 121 and a third viewing angle electrode 123. Both the first and third viewing angle electrodes 121 and 123 are arrayed in each pixel. In each pixel, the third viewing angle electrode 123 is located to the left of the first viewing angle electrode 121, and the angle between the third viewing angle electrode 123 and the first viewing angle electrode 121 is obtuse, and the first and third viewing angle electrodes 121 are not connected. The first viewing angle electrode 121 faces the frontal viewing angle of the electronic paper display panel 20, and the third viewing angle electrode 123 faces the right viewing angle of the electronic paper display panel 20. The electronic paper display panel 20 in this embodiment can realize different image displays from the right and center viewing angles, and can also enrich the display content while reducing the cost of the display panel, meeting the diverse needs of users.

[0031] In other embodiments, the electronic paper display panel 20 can display different images from two different viewing angles, a left-side view and a right-side view. Specifically, such as... Figure 4As shown, the electronic paper display panel 20 includes a second viewing angle electrode 122 and a third viewing angle electrode 123. Both the second and third viewing angle electrodes 122 and 123 are arrayed in each pixel. Within each pixel, the second and third viewing angle electrodes 122 and 123 are arranged opposite each other, with an acute angle between them. The second and third viewing angle electrodes 122 and 123 are not connected. The second viewing angle electrode 122 faces the left-hand view of the electronic paper display panel 20, and the third viewing angle electrode 123 faces the right-hand view of the electronic paper display panel 20. The electronic paper display panel 20 in this embodiment can display different images from both the right and left-hand perspectives, thus reducing display panel costs while enriching display content and meeting diverse user needs.

[0032] In some embodiments, the electronic paper display panel 20 in this application displays a black and white image, which is achieved by combining ink 140 and reflective layer 160.

[0033] like Figure 5 As shown, in some other embodiments, the electronic paper display panel 20 in this application embodiment displays a color image to enrich the image content. In this case, the electronic paper display panel 20 also includes three different colored color resists: a red color resist 21, a green color resist 22, and a blue color resist 23. Within the same pixel, a color resist of the same color is disposed between the viewing angle electrode 120 and the reflective layer 160, and the color resist colors in three adjacent pixels are different.

[0034] As a specific example, three adjacent pixels are designated as first pixel A, second pixel B, and third pixel C. Each pixel contains three viewing electrodes: a first viewing electrode 121, a second viewing electrode 122, and a third viewing electrode 123. In first pixel A, a red color resist 21 is provided between the three viewing electrodes and the reflective layer 160; in second pixel B, a green color resist 22 is provided between the three electrodes and the reflective layer 160; and in third pixel C, a blue color resist 23 is provided between the three electrodes and the reflective layer 160.

[0035] Combination Figure 1 and Figure 6As shown, when the electronic paper display panel 20 adopts a three-viewpoint different image design, in addition to the first viewing angle electrode 121, the second viewing angle electrode 122, the third viewing angle electrode 123, the hydrophobic layer 130, the ink 140, the conductive solution 150, and the reflective layer 160, the electronic paper display panel 20 also includes a first substrate 100, a first control electrode 211, a shaping layer 110, a second substrate 200, a second control electrode 212, and a third control electrode 213. The first control electrode 211 is disposed on the first substrate 100, and the shaping layer 110 is disposed on the first control electrode 211. The shaping layer 110 is provided with a plurality of inverted trapezoidal grooves 111, which are specifically inverted isosceles trapezoidal grooves, and the inverted trapezoidal grooves 111 pass through the shaping layer 110.

[0036] The first viewing angle electrode 121 is disposed at the bottom of the inverted trapezoidal groove 111 and connected to the first control electrode 211, which is used to control the voltage of the first viewing angle electrode 121. The second viewing angle electrode 122 is disposed on at least one side wall of the inverted trapezoidal groove 111, and the third viewing angle electrode 123 is disposed on at least the other side wall of the inverted trapezoidal groove 111. It should be noted that the two side walls of the inverted trapezoidal groove 111 refer to the two inclined and opposite inner surfaces of the groove.

[0037] Combination Figure 7 As shown, the second substrate 200 is disposed opposite to the first substrate 100. The second control electrode 212 is disposed on the side of the second substrate 200 facing the first substrate 100 and is connected to the second viewing angle electrode 122 to control the voltage of the second viewing angle electrode 122. The third control electrode 213 is disposed on the side of the second substrate 200 facing the first substrate 100 and is connected to the third viewing angle electrode 123 to control the voltage of the third viewing angle electrode 123. The hydrophobic layer 130 is disposed on the first viewing angle electrode 121, the second viewing angle electrode 122, and the third viewing angle electrode 123. The ink 140 is disposed on the hydrophobic layer 130. The reflective layer 160 is disposed below the first viewing angle electrode 121, the second viewing angle electrode 122, and the third viewing angle electrode 123.

[0038] It should be noted that although both the second-view electrode 122 and the third-view electrode 123 have hydrophobic layers 130, the lower view electrode 120 can be exposed by making holes in the hydrophobic layer 130 to allow the second-view electrode 122 to be connected to the second control electrode 212, and the third-view electrode 123 to be connected to the third control electrode 213. The specific design can be made according to the actual situation, and will not be elaborated here.

[0039] This embodiment of the application adjusts the angles of the first viewing angle electrode 121, the second viewing angle electrode 122, and the third viewing angle electrode 123 by designing the shape of the shaping layer 110. This makes the first viewing angle electrode 121 face the frontal view of the electronic paper display panel 20, the second viewing angle electrode 122 face the left view of the electronic paper display panel 20, and the third viewing angle electrode 123 face the right view of the electronic paper display panel 20. This not only facilitates the manufacturing process of the electronic paper display panel 20, but also ensures the stability of the first viewing angle electrode 121, the second viewing angle electrode 122, and the third viewing angle electrode 123, thereby ensuring the stability of the display effect from the three different viewing angles.

[0040] Furthermore, the second control electrode 212 abuts against the top of the shaping layer 110, and the third control electrode 213 abuts against the top of the shaping layer 110. In this embodiment, in addition to adjusting the angles of the first viewing angle electrode 121, the second viewing angle electrode 122, and the third viewing angle electrode 123 to maintain the corresponding viewing angle display, the shaping layer 110 can also support the second substrate 200, maintain the cell thickness between the first substrate 100 and the second substrate 200, avoid the need for additional support pillars, and simplify the manufacturing process of the electronic paper display panel 20.

[0041] In some embodiments, a portion of the second viewing angle electrode 122 is disposed on the top of the molding layer 110 and is attached to the second control electrode 212. In this case, the majority of the second viewing angle electrode 122 is located on the sidewall of the inverted trapezoidal groove 111, with only a small portion extending to the top of the molding layer 110 for press-fit connection with the second control electrode 212 during assembly. This design ensures the connection area and effect between the second viewing angle electrode 122 and the second control electrode 212, guarantees signal stability between them, and reduces signal loss. The third viewing angle electrode 123 also adopts the same design, with the majority of the third viewing angle electrode 123 located on the sidewall of the inverted trapezoidal groove 111, and only a small portion disposed on the top of the molding layer 110 and attached to the third control electrode 213. In this embodiment, the portion of the second viewing angle electrode 122 and the third viewing angle electrode 123 located on the top of the molding layer 110 is not covered by the hydrophobic layer 130 and the ink 140.

[0042] In other embodiments, the second viewing angle electrodes 122 may also be entirely disposed on one sidewall of the inverted trapezoidal groove 111, with the top of the second viewing angle electrodes 122 flush with the top of the shaping layer 110, so that the top of the second viewing angle electrodes 122 contacts the second control electrode 212. Similarly, the third viewing angle electrodes 123 may also be entirely disposed on the other sidewall of the inverted trapezoidal groove 111, with the top of the third viewing angle electrodes 123 flush with the top of the shaping layer 110, so that the top of the third viewing angle electrodes 123 contacts the third control electrode 213.

[0043] In some embodiments, the ink 140 is made of a black material, the shaping layer 110 is made of a white material, and the shaping layer 110 and the reflective layer 160 are an integral structure. It is understood that the shaping layer 110 itself can reflect light, eliminating the need for an additional reflective layer 160. In this case, the reflective layer 160 can also be used as the shaping layer 110, thereby reducing the number of manufacturing steps in the electronic paper display panel 20.

[0044] In other embodiments, the shaping layer 110 may also be made of a transparent material, such as transparent resin, UV-curable adhesive, silicon oxide, or silicon nitride. In this case, the reflective layer 160 is disposed between the shaping layer 110 and the first substrate 100; or, the reflective layer 160 may be disposed on both sides and the bottom of the inverted trapezoidal groove 111, and then the viewing angle electrode 120 is disposed on the reflective layer 160.

[0045] In other embodiments, the ink 140 may be made of a white material, in which case the shaping layer 110 is made of a black material.

[0046] like Figure 8 and Figure 9As shown, in some embodiments, the electronic paper display panel 20 further includes a black matrix layer 220. The black matrix layer 220 is disposed on the side of the second substrate 200 facing the first substrate 100, and also on the side of the second control electrode 212 and the third control electrode 213 facing the first substrate 100. The black matrix layer 220 includes a plurality of spaced black matrix blocks 221. The orthographic projection of the black matrix blocks 221 on the first substrate 100 covers the orthographic projection of the gap between the second viewing angle electrode 122 and the third viewing angle electrode 123 on the first substrate 100, as well as the orthographic projection of the second viewing angle electrode 122 and the third viewing angle electrode 123 on the first substrate 100. This embodiment further adds a black matrix layer 220 to the electronic paper display panel 20. Since the gap between the second viewing angle electrode 122 and the third viewing angle electrode 123 is the boundary of adjacent pixels, by covering the orthographic projection of the black matrix layer 220 on the first substrate 100 with the orthographic projection of the gap between the second viewing angle electrode 122 and the third viewing angle electrode 123 on the first substrate 100, color crosstalk between pixels is prevented. Meanwhile, considering that in order to increase the connection area between the second-view electrode 122 and the third-view electrode 123 and the control electrode 210, the second-view electrode 122 and the third-view electrode 123 are placed on top of the shaping layer 110. This may cause the area corresponding to the second-view electrode 120 on top of the shaping layer 110 to display a different orthogonal view than that provided by the first-view electrode 121, resulting in an abnormal orthogonal view. By covering the orthogonal projection of the black matrix layer 220 on the first substrate 100 with the orthogonal projection of the second-view electrode 122 and the third-view electrode 123 themselves on the first substrate 100, this abnormal view is blocked, ensuring the integrity of the orthogonal view.

[0047] To ensure the connection between the second viewing angle electrode 122 and the second control electrode 212, as well as the connection between the third viewing angle electrode 123 and the third control electrode 213, an opening can be made in the black matrix layer 200, allowing the viewing angle electrode to pass through the opening and connect to the control electrode. Alternatively, the connection points of the second control electrode 212 and the third control electrode 213 corresponding to the viewing angle electrode can be thickened, and this thickened part can be exposed during subsequent exposure and development of the black matrix layer. Alternatively, a winding design can be used to avoid the second control electrode 212 and the third control electrode 213 from the black matrix layer 220. The specific design can be selected according to the actual situation and is not limited here.

[0048] Furthermore, such as Figure 9As shown, in this embodiment, the spacing L1 between adjacent black matrix blocks 221 in the black matrix layer 220 is designed to be half the width L2 of the first viewing angle electrode 121. Furthermore, the orthographic projection of the black matrix layer 220 onto the first substrate 100 covers both sides of the first viewing angle electrode 121. Specifically, the orthographic projection of the black matrix block 221 located to the left of the first viewing angle electrode 121 onto the first substrate 100 covers one-quarter of the width of the first viewing angle electrode 121, and the orthographic projection of the black matrix block 221 located to the right of the first viewing angle electrode 121 onto the first substrate 100 covers one-quarter of the width of the first viewing angle electrode 121. Simultaneously, the angle between the first viewing angle electrode 121 and the second viewing angle electrode 122 within the same pixel is designed to be 135°, and the angle between the first viewing angle electrode 121 and the third viewing angle electrode 123 is designed to be 135°. At this point, taking a plane parallel to the electronic paper display panel 20 as an example, the content displayed in the area corresponding to the third viewing angle electrode 123 can be seen in the 0-45° side viewing angle range, the content displayed in the area corresponding to the first viewing angle electrode 121 can be seen in the 45°-135° frontal viewing angle range, and the content displayed in the area corresponding to the second viewing angle electrode 122 can be seen in the 135°-180° side viewing angle range. Within this range, the center, left, and right viewing angles all have good viewing range, resulting in good visual effects.

[0049] like Figure 10 As shown, in some embodiments, in order to keep the first viewing angle electrode 121, the second viewing angle electrode 122, and the third viewing angle electrode 123 disconnected, the three viewing angle electrodes 120 are disconnected instead of being insulated by adding an additional insulating layer, thereby avoiding additional processing steps. In this case, a first gap 124 exists between the second viewing angle electrode 122 and the first viewing angle electrode 121, located at the junction of the bottom and one side wall of the inverted trapezoidal groove 111; a second gap 125 exists between the third viewing angle electrode 123 and the first viewing angle electrode 121, located at the junction of the bottom and another side wall of the inverted trapezoidal groove 111; the temporary storage area of ​​the ink 140 is located above the first gap 124 and the second gap 125.

[0050] The temporary storage area of ​​the ink 140 is understood as the corner position to which the ink 140 retracts when the viewing angle electrode 120 is energized. In this embodiment, the temporary storage area of ​​the ink 140 is located at the gap between adjacent viewing angle electrodes 120. When the viewing angle electrode 120 is energized, the ink 140 retracts from above the viewing angle electrode 120 to the temporary storage area; when the viewing angle electrode 120 is not energized, the ink 140 extends from the temporary storage area to above the viewing angle electrode 120.

[0051] Due to the presence of the first gap 124 and the second gap 125, the hydrophobic layer 130 laid on the first gap 124 and the second gap 125 will have pits. When the ink 140 passes through the pits during extension or contraction, the edge movement speed of the ink 140 will be uneven, resulting in uneven display effect of the electronic paper display panel 20. To address this problem, this embodiment sets the temporary storage area of ​​the ink 140 above the first gap 124 and the second gap 125, so that the ink 140 does not need to pass through the pits on the hydrophobic layer 130 during contraction and extension, thereby avoiding uneven movement speed and uneven display. Furthermore, this embodiment divides the ink 140 in each pixel into two parts, and sets the temporary storage areas of these two parts of ink 140 above the first gap 124 and the second gap 125 respectively, shortening the extension distance of a single ink 140 and accelerating the response speed of each pixel.

[0052] like Figure 11 As shown, in some embodiments, the electronic paper display panel 20 further includes a rotating component 300, which is connected to the viewing angle electrode 120 and used to adjust the angle of the viewing angle electrode 120. The rotating component 300 is simultaneously connected to the first viewing angle electrode 121, the second viewing angle electrode 122, and the third viewing angle electrode 123, and independently controls the angles between the first viewing angle electrode 121 and the light-emitting surface of the electronic paper display panel 20, the second viewing angle electrode 122 and the light-emitting surface of the electronic paper display panel 20, and the third viewing angle electrode 123 and the light-emitting surface of the electronic paper display panel 20, respectively. This achieves the purpose of adjusting the viewing angle range of the center view, the left view, and the right view to meet differentiated needs in special scenarios.

[0053] Specifically, the rotating assembly 300 includes a controller 310, a first support plate 320, a second support plate 330, a third support plate 340, a first connecting rod 350, a second connecting rod 360, and a third connecting rod 370. A first viewing angle electrode 121 is fixed on the first support plate 320, a second viewing angle electrode 122 is fixed on the second support plate 330, and a third viewing angle electrode 123 is fixed on the third support plate 340. One end of each of the first connecting rods 350, 360, and 370 is connected to the controller 310, and the other end is connected to the bottom of each of the first support plate 320, 330, and 340, respectively. Furthermore, the ends of each of the first connecting rods 350, 360, and 370 are rotatably connected to the first support plate 320, 330, and 340 via a motor (not shown in the figure). The first link 350, the second link 360, and the third link 370 are all equipped with wiring. One end of the wiring is connected to the controller 310, and the other end is connected to the motor. The controller 310 controls the motor at the first link 350, the second link 360, and / or the third link 370 according to the user's requirements, and controls the rotation of the first support plate 320, the second support plate 330, and / or the third support plate 340 to achieve the adjustment of the viewing angle.

[0054] This application embodiment also provides a method for manufacturing the above-mentioned electronic paper display panel 20. First, a first substrate 100 is provided, and a first control electrode 211 is developed on the first substrate 100. Then, an ultraviolet curable adhesive (UV adhesive) is coated on the first substrate 100, and an inverted trapezoidal groove 111 is imprinted on the UV adhesive using a precision mold and an imprinting process. Next, the UV adhesive is cured into a molding layer 110 by ultraviolet exposure on the back side of the first substrate 100. Afterward, a reflective layer 160 is deposited in the inverted trapezoidal groove 111, and electrodes are deposited on the reflective layer 160. The electrodes are etched into a first viewing angle electrode 121, a second viewing angle electrode 122, and a third viewing angle electrode 123 in parallel by an etching method. Then, an insulating hydrophobic layer 130 is deposited on the three viewing angle electrodes 120, and electrode ports are etched in the areas corresponding to the second viewing angle electrode 122 and the third viewing angle electrode 123.

[0055] Next, a second substrate 200 is provided, on which a second control electrode 212 and a third control electrode 213 are developed. During the process, the thickness of the connection points between the second control electrode 212 and the third control electrode 213 and the viewing angle electrode 120 can be controlled to improve the connection effect. Then, a black matrix layer 220 is exposed and developed.

[0056] Finally, the assembly process involves coating ink 140 onto the hydrophobic layer 130 of the first substrate 100, injecting conductive solution 150, coating frame adhesive onto the edge of the first substrate 100, and finally joining the first substrate 100 and the second substrate 200 together to complete the fabrication of the electronic paper display panel 20.

[0057] like Figure 12 As shown, a display device 10 provided as a second embodiment of this application includes a driving circuit 30 and an electronic paper display panel 20 as described above. The driving circuit 30 is electrically connected to the electronic paper display panel 20 and is used to drive the electronic paper display panel 20.

[0058] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. An electronic paper display panel, characterized in that, include: At least two sets of viewing angle electrodes are simultaneously disposed in each pixel, with different viewing angle electrodes arranged side by side and not connected, and the different viewing angle electrodes facing different viewing angles of the electronic paper display panel; A hydrophobic layer is disposed on the side of the viewing angle electrode facing the light-emitting surface of the electronic paper display panel; The ink is disposed on the side of the hydrophobic layer away from the viewing angle electrode; A conductive solution is disposed on the ink; A reflective layer is disposed on the side of the viewing electrode away from the hydrophobic layer for reflecting light; as well as At least two control electrodes are respectively connected to the at least two sets of viewing angle electrodes to control the voltage of the corresponding viewing angle electrodes.

2. The electronic paper display panel as described in claim 1, characterized in that, The electronic paper display panel includes three sets of viewing angle electrodes, namely a first viewing angle electrode, a second viewing angle electrode, and a third viewing angle electrode. The first viewing angle electrode, the second viewing angle electrode, and the third viewing angle electrode are simultaneously disposed in each pixel. In each pixel, the second viewing angle electrode and the third viewing angle electrode are respectively located on both sides of the first viewing angle electrode. The first viewing angle electrode faces the frontal viewing angle of the electronic paper display panel, the second viewing angle electrode faces the left viewing angle of the electronic paper display panel, and the third viewing angle electrode faces the right viewing angle of the electronic paper display panel.

3. The electronic paper display panel as described in claim 2, characterized in that, The electronic paper display panel includes: First substrate: A first control electrode is disposed on the first substrate; A shaping layer is disposed on the first control electrode, and the shaping layer has a plurality of inverted trapezoidal grooves, which pass through the shaping layer; the first viewing angle electrode is disposed at the bottom of the inverted trapezoidal groove and connected to the first control electrode; the second viewing angle electrode is disposed at least on one side wall of the inverted trapezoidal groove, and the third viewing angle electrode is disposed at least on the other side wall of the inverted trapezoidal groove; The second substrate is disposed opposite to the first substrate; A second control electrode is disposed on the side of the second substrate facing the first substrate, connected to the second viewing angle electrode, and abutting against the top of the shaping layer; and The third control electrode is disposed on the side of the second substrate facing the first substrate, connected to the third viewing angle electrode, and the third control electrode abuts against the top of the shaping layer.

4. The electronic paper display panel as described in claim 3, characterized in that, A portion of the second viewing angle electrode is disposed on the top of the shaping layer and is attached to and connected to the second control electrode; a portion of the third viewing angle electrode is disposed on the top of the shaping layer and is attached to and connected to the third control electrode.

5. The electronic paper display panel as described in claim 3, characterized in that, The ink is made of black material, the shaping layer is made of white material, and the shaping layer and the reflective layer are an integral structure.

6. The electronic paper display panel as described in claim 3, characterized in that, The electronic paper display panel further includes a black matrix layer, which is disposed on the side of the second substrate facing the first substrate; The black matrix layer includes a plurality of spaced black matrix blocks. The orthographic projection of the black matrix blocks on the first substrate covers the orthographic projection of the gap between the second view electrode and the third view electrode on the first substrate, as well as the orthographic projection of the second view electrode and the third view electrode on the first substrate.

7. The electronic paper display panel as described in claim 3, characterized in that, The second viewing angle electrode and the first viewing angle electrode have a first gap, which is located at the junction of the bottom of the inverted trapezoidal groove and one side wall; the third viewing angle electrode and the first viewing angle electrode have a second gap, which is located at the junction of the bottom of the inverted trapezoidal groove and the other side wall. The ink storage area is located above the first gap and the second gap.

8. The electronic paper display panel as described in claim 1, characterized in that, The electronic paper display panel also includes color resist. In the same pixel, color resist of the same color is disposed between the viewing angle electrode and the reflective layer, and the color resist colors in three adjacent pixels are different.

9. The electronic paper display panel as described in claim 1, characterized in that, The electronic paper display panel also includes a rotating component connected to the viewing angle electrode for adjusting the angle of the viewing angle electrode.

10. A display device, characterized in that, It includes a driving circuit and an electronic paper display panel as described in any one of claims 1-9, wherein the driving circuit is electrically connected to the electronic paper display panel and is used to drive the electronic paper display panel.

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