Printing drum and printing apparatus

Abstract

The application discloses a printing drum and a printing device, and the printing drum comprises a drum body, a pixel structure is distributed on the surface of the drum body, the pixel structure comprises a substrate and a charge transport layer, the substrate is arranged on the drum body, and the charge transport layer is arranged on the side of the substrate away from the drum body; a micro-electro-mechanical structure comprises a first electrode, a second electrode and a conductive suspension arm, the first electrode is electrically connected with the charge transport layer, and the conductive suspension arm can conduct or disconnect the first electrode and the second electrode. In the printing process, the first electrode and the second electrode are conducted or disconnected through the conductive suspension arm, so that the electric charge on the charge transport layer can be conducted and lost through the conductive suspension arm and the second electrode, the distribution of the surface electric charge of the charge transport layer can be controlled, the electrostatic adsorption amount of carbon powder in the printing process can be controlled, printing can be realized, the optical effect can be avoided, the service life of the printing drum can be prolonged, and the printing life can be prolonged.

Description

Technical Field

[0001] This invention belongs to the field of printing technology, specifically relating to a printing drum and printing equipment. Background Technology

[0002] A laser printer's drum unit is a cylindrical container coated with organic or inorganic photosensitive materials. Currently, the drum unit, or photosensitive sensor, is the main component of a laser printer. It utilizes the principle of photoconductivity; the light-receiving area (pixel) becomes photoconductive, allowing the charge accumulated on the film surface to dissipate, thus controlling the distribution of surface charge. This surface charge distribution determines the amount of toner electrostatically adsorbed, thereby controlling the formation of the printed pattern. During laser printing, the adsorption of toner by the pixels within the drum unit is controlled by light. This process involves light absorption, photoelectric effects, light attenuation, and more, making it quite complex. The photoelectric process limits the drum unit's lifespan, hindering the extension of printing life. Summary of the Invention

[0003] The purpose of this invention is to provide a printing drum and printing equipment to solve the problem that the photoelectric process during laser printing limits the lifespan of the drum, which is not conducive to extending the printing life.

[0004] In a first aspect, embodiments of the present invention provide a printing drum, comprising:

[0005] A drum body, the surface of which is distributed with pixel structures, the pixel structures including a substrate and a charge transport layer, the substrate being disposed on the drum body, and the charge transport layer being disposed on the side of the substrate away from the drum body;

[0006] A microelectromechanical structure (MEMS) includes a first electrode, a second electrode, and a conductive cantilever. The first electrode is electrically connected to the charge transport layer, and the conductive cantilever can connect or disconnect the first electrode from the second electrode.

[0007] One end of the conductive cantilever is electrically connected to the first electrode, and the other end of the conductive cantilever can be abutted against or moved away from the second electrode.

[0008] The microelectromechanical structure further includes:

[0009] The third electrode is insulated from the conductive cantilever. When the third electrode and the conductive cantilever are charged, the third electrode drives the conductive cantilever to connect or disconnect the first electrode and the second electrode.

[0010] The microelectromechanical structure further includes:

[0011] An insulating layer is provided on the substrate, comprising a first conductive layer, a second conductive layer, and a third conductive layer, wherein the insulating layer covers the first conductive layer, the second conductive layer, and the third conductive layer;

[0012] The first electrode, the second electrode, and the third electrode are disposed on the side of the insulating layer away from the substrate. The first electrode is electrically connected to the first conductive layer, the second electrode is electrically connected to the second conductive layer, and the third electrode is electrically connected to the third conductive layer.

[0013] The insulating layer has a first contact layer and a second contact layer on the side away from the substrate. The first contact layer is electrically connected to the first electrode, and the second contact layer is electrically connected to the second electrode.

[0014] One end of the conductive cantilever is electrically connected to the second contact layer, and the other end of the conductive cantilever can abut against or move away from the first contact layer; or, one end of the conductive cantilever is electrically connected to the first contact layer, and the other end of the conductive cantilever can abut against or move away from the second contact layer.

[0015] The microelectromechanical structure further includes:

[0016] A shielding body is disposed on the insulating layer. The shielding body has a cavity, and a conductive cantilever is disposed in the cavity. The conductive cantilever is spaced apart from the shielding body.

[0017] The third electrode, the first contact layer, and the second contact layer are located inside the cavity, while the first electrode and the second electrode are located outside the cavity.

[0018] An insulating spacer layer is provided between adjacent elements of the first electrode, the second electrode, the third electrode, the first contact layer, and the second contact layer; and / or

[0019] The first electrode, the second electrode, the third electrode, the first contact layer, and the second contact layer are disposed in the same layer.

[0020] The first electrode, the second electrode, and the third electrode are disposed in the same layer on the substrate.

[0021] The microelectromechanical structure further includes:

[0022] The bottom electrode is disposed between the substrate and the charge transport layer, and the first electrode is disposed between the charge transport layer and the first electrode. The bottom electrode is electrically connected to the first electrode.

[0023] The microelectromechanical structure further includes:

[0024] An insulating layer is disposed between the bottom electrode and the first electrode, and the insulating layer has a via, through which the bottom electrode and the first electrode are electrically connected.

[0025] The microelectromechanical structure further includes:

[0026] A shielding body is disposed on the substrate, the shielding body has a cavity, a conductive cantilever is disposed in the cavity, and the conductive cantilever is spaced apart from the shielding body.

[0027] Secondly, embodiments of the present invention provide a printing device, including the printing drum described in the above embodiments.

[0028] In the printing drum of this invention, the surface of the drum body is distributed with pixel structures. Each pixel structure includes a substrate and a charge transport layer. The substrate is disposed on the drum body, and the charge transport layer is disposed on the side of the substrate away from the drum body. A microelectromechanical system (MEMS) is also included, comprising a first electrode, a second electrode, and a conductive cantilever. The first electrode is electrically connected to the charge transport layer, and the conductive cantilever can connect or disconnect the first electrode and the second electrode. During printing, the charge transport layer carries a charge. Because the first electrode is electrically connected to the charge transport layer, the charge on the charge transport layer can be dissipated through the conductive cantilever and the second electrode, controlling the distribution of charge on the surface of the charge transport layer. By controlling the distribution of charge on the surface of the charge transport layer, the amount of electrostatic adsorption of toner during printing can be controlled, thereby controlling the formation of the printed pattern. During printing, the entire process does not involve photoelectric conversion, avoiding optical effects and extending the lifespan of the printing drum and the printing cycle. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the interaction between the charge transport layer and the microelectromechanical structure according to an embodiment of the present invention;

[0030] Figure 2 This is another schematic diagram illustrating the interaction between the charge transport layer and the microelectromechanical structure according to an embodiment of the present invention;

[0031] Figure 3 This is a partial schematic diagram of the microelectromechanical structure on the drum body according to an embodiment of the present invention;

[0032] Figure 4 This is a top view of the charge transport layer and the microelectromechanical structure in an embodiment of the present invention;

[0033] Figure 5 This is an equivalent circuit diagram showing the connection between the charge transport layer and the microelectromechanical structure.

[0034] Figure 6 This is another schematic diagram of the charge transport layer and the microelectromechanical structure in an embodiment of the present invention.

[0035] Figure Labels

[0036] Drum body 10;

[0037] Substrate 20;

[0038] First conductive layer 21; Second conductive layer 22; Third conductive layer 23;

[0039] Charge transport layer 30;

[0040] Conductive cantilever 40;

[0041] First electrode 41; Second electrode 42; Third electrode 43;

[0042] Bottom electrode 44; Insulating layer 45; Contact structure 46; Conductive material layer 47; Conductor 48;

[0043] Insulation layer 50;

[0044] First contact layer 51; Second contact layer 52;

[0045] Shielding body 60;

[0046] Chamber 61; Insulating spacer layer 62;

[0047] Charge transport line 70; MEMS switch 71;

[0048] Control circuit 80; first control line 81; second control line 82. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] The terms "first," "second," etc., used in the specification and claims of this invention are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention can be implemented in orders other than those illustrated or described herein. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0051] The following is in conjunction with the appendix Figures 1 to 6 As shown, the printing drum provided in the embodiments of the present invention will be described in detail through specific examples and application scenarios.

[0052] like Figures 1 to 3 As shown, the printing drum of this embodiment includes a drum body 10 and a microelectromechanical system (MEMS). The surface of the drum body 10 is distributed with pixel structures. The drum body 10 can be cylindrical, and the pixel structures distributed on the surface of the drum body 10 can be uniformly spaced. Each pixel structure may include a substrate 20 and a charge transport layer 30. The substrate 20 is disposed on the drum body 10, and the charge transport layer 30 can be disposed on the side of the substrate 20 away from the drum body 10. The substrate 20 can be a flexible substrate to facilitate mating with the surface of the drum body 10. The side length of the orthographic projection of the pixel structure onto the substrate 20 can be 21-168 μm. For example, the orthographic projection of the pixel structure onto the substrate 20 can be square, with a side length of 80 μm. The specific dimensions of the pixel structure can be selected according to actual needs. The charge transport layer 30 can be rectangular, and its orthographic projection onto the substrate 20 can be square, with a side length of 50 μm. The specific dimensions of the charge transport layer 30 can be selected according to actual needs.

[0053] The microelectromechanical system (MEMS) may include a first electrode 41, a second electrode 42, and a conductive cantilever 40. The first electrode 41 is electrically connected to the charge transport layer 30, and the conductive cantilever 40 can connect or disconnect the first electrode 41 and the second electrode 42. The conductive cantilever 40 is movable, and its position or state can be changed by its movement, allowing it to connect or disconnect the first electrode 41 and the second electrode 42. For example, in the disconnected state, the conductive cantilever 40 is spaced apart from the first electrode 41 and the second electrode 42, disconnecting them. The charge on the surface of the charge transport layer 30 cannot flow to the second electrode, and the charge is not discharged. In the connected state, the conductive cantilever 40 is in contact with both the first electrode 41 and the second electrode 42, allowing it to connect them. The charge on the surface of the charge transport layer 30 can flow to the second electrode through the conductive cantilever 40, and the charge can be discharged. By connecting or disconnecting the first electrode 41 and the second electrode 42 via the conductive cantilever 40, the charge distribution on the surface of the charge transport layer 30 can be controlled, thereby controlling the amount of toner electrostatically adsorbed during the printing process. Each pixel structure's charge transport layer 30 can correspond to a microelectromechanical structure (MEMS). By controlling the charge distribution on the surface of the charge transport layer 30 in the pixel structure through the MEMS, the amount of toner electrostatically adsorbed during the printing process can be controlled.

[0054] The charge transport layer 30 may include one or more of the following: poly(p-phenylenevinyl chloride) (PPV), polythiophene, polysilane, triphenylmethane, triarylamine, hydrazone, pyrazoline, chezolium, carbazole, and butadiene. The specific materials selected can be chosen from existing materials based on the actual situation. Alternatively, the charge transport layer 30 may include one or more of the following electron-transporting materials: fused rings, aromatic heterocyclic compounds, and fluorinated aromatic hydrocarbons. The specific materials selected can be chosen from existing materials based on the actual situation.

[0055] In the printing drum of this embodiment of the invention, the first electrode 41 is electrically connected to the charge transport layer 30, and the conductive cantilever 40 can connect or disconnect the first electrode 41 and the second electrode 42. During the printing process, the charge transport layer 30 carries a charge. Since the first electrode 41 is electrically connected to the charge transport layer 30, the charge on the charge transport layer 30 can be dissipated through the conductive cantilever 40 and the second electrode 42 by connecting or disconnecting the first electrode 41 and the second electrode 42, thereby controlling the distribution of charge on the surface of the charge transport layer 30. By controlling the distribution of charge on the surface of the charge transport layer 30, the amount of electrostatic adsorption of toner during the printing process can be controlled, thereby controlling the formation of the printed pattern. During the printing process, no laser is required, and the entire process does not involve photoelectric conversion, avoiding optical effects, which helps extend the service life of the printing drum, prolongs the printing life, and reduces costs.

[0056] In some embodiments, such as Figure 1 As shown, one end of the conductive cantilever 40 is electrically connected to the first electrode 41, and the other end of the conductive cantilever 40 can be abutted against or moved away from the second electrode 42. When the other end of the conductive cantilever 40 abuts against the second electrode 42, the conductive cantilever 40 can conduct electricity between the first electrode 41 and the second electrode 42; when the other end of the conductive cantilever 40 is moved away from the second electrode 42, the conductive cantilever 40 can disconnect the first electrode 41 and the second electrode 42, and the charge on the surface of the charge transport layer 30 cannot flow to the second electrode 42, and the charge on the surface of the charge transport layer 30 will not be discharged. A contact structure 46 is provided in the area near the second electrode 42 at the other end of the conductive cantilever 40. The contact structure 46 can be made of conductive material and can be elastic, providing a buffering effect to reduce collision damage between the other end of the conductive cantilever 40 and the second electrode 42.

[0057] like Figure 1As shown, the microelectromechanical system (MEMS) may further include a third electrode 43, which is insulated from the conductive cantilever 40. During application, in the initial working state, the second electrode 42 can be connected to a voltage of 600–800V. A certain voltage is applied to the third electrode 43, preventing the conductive cantilever 40 from contacting the second electrode 42, thus keeping the MEMS switch in the off state. The charging roller charges the surface of the charge transport layer 30, covering it with a certain amount of charge. In the pixel structure where toner needs to be adsorbed, a voltage is applied to make the conductive cantilever 40 contact the second electrode 42, turning on the MEMS switch and causing the charge on the surface of the charge transport layer 30 to be conducted away. The remaining pixel area with static charge can then adsorb toner.

[0058] In embodiments of the present invention, such as Figures 1 to 3 As shown, the microelectromechanical system (MEMS) further includes a third electrode 43, which is insulated from the conductive cantilever 40. When the third electrode 43 and the conductive cantilever 40 are charged, the third electrode 43 drives the conductive cantilever 40 to connect or disconnect the first electrode 41 and the second electrode 42. When the third electrode 43 and the conductive cantilever 40 carry the same charge, they repel each other, and the third electrode 43 can drive the conductive cantilever 40 to move away from the third electrode 43. When the third electrode 43 and the conductive cantilever 40 carry opposite charges, they attract each other, and the third electrode 43 can drive the conductive cantilever 40 to move closer to the third electrode 43. The force generated by the charges on the third electrode 43 and the conductive cantilever 40 can cause the conductive cantilever 40 to move, allowing the third electrode 43 to drive the conductive cantilever 40 closer to or away from the first electrode 41 and the second electrode 42, thereby enabling the third electrode 43 to drive the conductive cantilever 40 to connect or disconnect the first electrode 41 and the second electrode 42. During the printing process, different third electrodes 43 can be controlled to drive the conductive cantilever 40 to turn on or off the first electrode 41 and the second electrode 42 as needed, thereby controlling the distribution of surface charge on the charge transport layer 30 in different pixel structures. This can control the amount of electrostatic adsorption of toner during the printing process to achieve printing.

[0059] In some embodiments, such as Figure 2As shown, the microelectromechanical structure further includes: an insulating layer 50; a first conductive layer 21, a second conductive layer 22, and a third conductive layer 23 are disposed on the substrate 20, with the first conductive layer 21, the second conductive layer 22, and the third conductive layer 23 spaced apart and insulated from each other; the insulating layer 50 covers the first conductive layer 21, the second conductive layer 22, and the third conductive layer 23, reducing contact between the first conductive layer 21, the second conductive layer 22, and the third conductive layer 23 and the surrounding structure, preventing open circuits. A first electrode 41, a second electrode 42, and a third electrode 43 are disposed on the side of the insulating layer 50 away from the substrate 20; the first electrode 41 is electrically connected to the first conductive layer 21, the second electrode 42 is electrically connected to the second conductive layer 22, and the third electrode 43 is electrically connected to the third conductive layer 23. Through-holes can be provided in the insulating layer 50, allowing the electrodes to be electrically connected to the corresponding conductive layers through the through-holes.

[0060] On the side of the insulating layer 50 away from the substrate 20, a first contact layer 51 and a second contact layer 52 may be provided. The first contact layer 51 is electrically connected to the first electrode 41, and the second contact layer 52 is electrically connected to the second electrode 42. One end of the conductive cantilever 40 is electrically connected to the second contact layer 52, and one end of the conductive cantilever 40 may be fixedly connected to the second contact layer 52. The other end of the conductive cantilever 40 may abut against or move away from the first contact layer 51. When the other end of the conductive cantilever 40 abuts against the first contact layer 51, the conductive cantilever 40 can conduct electricity between the first electrode 41 and the second electrode 42, and the charge on the surface of the charge transport layer 30 can flow to the second electrode 42. When the other end of the conductive cantilever 40 moves away from the first contact layer 51, the conductive cantilever 40 can disconnect the first electrode 41 and the second electrode 42, and the charge on the surface of the charge transport layer 30 cannot flow to the second electrode 42, and the charge on the surface of the charge transport layer 30 will not be discharged. The other end of the conductive cantilever 40 is provided with a contact structure 46 near the first contact layer 51. The contact structure 46 can be made of conductive material and can be elastic to provide a buffering effect, thereby reducing collision damage between the other end of the conductive cantilever 40 and the first contact layer 51.

[0061] In some embodiments, such as Figure 2As shown, the insulating layer 50, on the side away from the substrate 20, may have a first contact layer 51 and a second contact layer 52. The first contact layer 51 is electrically connected to the first electrode 41, and the second contact layer 52 is electrically connected to the second electrode 42. One end of the conductive cantilever 40 is electrically connected to the first contact layer 51, and one end of the conductive cantilever 40 may be fixedly connected to the first contact layer 51. The other end of the conductive cantilever 40 may abut against or move away from the second contact layer 52. When the other end of the conductive cantilever 40 abuts against the second contact layer 52, the conductive cantilever 40 can conduct electricity between the first electrode 41 and the second electrode 42, and the charge on the surface of the charge transport layer 30 can flow to the second electrode 42. When the other end of the conductive cantilever 40 moves away from the second contact layer 52, the conductive cantilever 40 can disconnect the first electrode 41 and the second electrode 42, and the charge on the surface of the charge transport layer 30 cannot flow to the second electrode 42, and the charge on the surface of the charge transport layer 30 will not be discharged.

[0062] Optionally, such as Figure 2 As shown, the microelectromechanical structure also includes: a shield 60, which is disposed on the insulating layer 50. The shield 60 has a cavity 61, and a conductive cantilever 40 is disposed in the cavity 61. The conductive cantilever 40 is spaced apart from the shield 60. The shield 60 can prevent electromagnetic interference from the external environment from affecting the conductive cantilever 40, and prevent the conductive cantilever 40 from conducting or disconnecting the first electrode 41 and the second electrode 42 due to electromagnetic interference from the external environment. The spaced-apart arrangement of the conductive cantilever 40 and the shield 60 makes it less likely to come into contact with the conductive cantilever 40 when the shield 60 is deformed by external forces, thus reducing damage to the conductive cantilever 40 when the shield 60 is deformed by external forces.

[0063] Optionally, the third electrode 43, the first contact layer 51, and the second contact layer 52 are located inside the chamber 61, while the first electrode 41 and the second electrode 42 are located outside the chamber 61. The shield 60 prevents electromagnetic interference from the external environment from affecting the third electrode 43, the first contact layer 51, and the second contact layer 52, enhancing the reliability of the conductive cantilever 40 in connecting or disconnecting the first electrode 41 and the second electrode 42. The insulating layer 50 seals the chamber 61, making it airtight. The shield 60 protects the conductive cantilever 40, the third electrode 43, the first contact layer 51, and the second contact layer 52, reducing the impact of gases, dust, etc., from the external environment on these components.

[0064] Optionally, an insulating spacer layer 62 may be provided between adjacent electrodes 41, 42, 43, 51, and 52. The insulating spacer layer 62 can reduce surface leakage and reduce the risk of short circuit between adjacent electrodes.

[0065] Optionally, the first electrode 41, the second electrode 42, the third electrode 43, the first contact layer 51, and the second contact layer 52 are disposed in the same layer, which facilitates processing and manufacturing and simplifies the process. The thickness of the first electrode 41, the second electrode 42, the third electrode 43, the first contact layer 51, and the second contact layer 52 can be the same, and the materials of the first electrode 41, the second electrode 42, the third electrode 43, the first contact layer 51, and the second contact layer 52 can be the same, which simplifies the preparation process.

[0066] Optionally, the first electrode 41, the second electrode 42, and the third electrode 43 are disposed on the substrate 20 in the same layer, which facilitates manufacturing and simplifies the process. An insulating spacer layer can be provided between adjacent first electrodes 41, second electrodes 42, and third electrodes 43 to reduce the risk of short circuits between adjacent electrodes. The third electrode 43 can be disposed between the first electrode 41 and the second electrode 42, and a conductive cantilever 40 can be disposed above the third electrode 43 to facilitate the cooperation between the conductive cantilever 40 and the first electrode 41 and the second electrode 42, so that the conductive cantilever 40 can conduct or disconnect the first electrode 41 and the second electrode 42.

[0067] Optionally, the microelectromechanical structure further includes a bottom electrode 44, which can be made of a metallic material, such as aluminum alloy or copper. The first electrode 41 is disposed between the substrate 20 and the charge transport layer 30, and the bottom electrode 44 is disposed between the charge transport layer 30 and the first electrode 41. The bottom electrode 44 and the first electrode 41 are electrically connected so that the charge on the charge transport layer 30 can be quickly transferred to the first electrode 41 through the bottom electrode 44, thereby improving the charge transport efficiency.

[0068] Optionally, such as Figure 1 and Figure 2 As shown, the microelectromechanical structure also includes an insulating layer 45, which is disposed between the bottom electrode 44 and the first electrode 41. The insulating layer 45 has vias, and the bottom electrode 44 and the first electrode 41 are electrically connected through the vias, which facilitates an effective connection between the bottom electrode 44 and the first electrode 41. The spacing between the vias can be less than 5 μm, and the radial dimension of the vias can be less than 3 μm.

[0069] A conductive material layer 47 may be disposed between the insulating layer 45 and the first electrode 41. The conductive material layer 47 and the first electrode 41 may be made of the same or different materials. The conductive material layer 47 facilitates the rapid transfer of charge to the first electrode 41, thereby improving the charge transfer efficiency. A conductor 48 may be connected to the second electrode 42. The conductor 48 may be connected to an external grounding terminal to facilitate the transfer of charge. The insulating layer 45 may be an insulating material, which may include at least one of SiNx, Al2O3, and HfO2.

[0070] In some embodiments, such as Figure 2As shown, the microelectromechanical structure also includes: a shield 60, which is disposed on the substrate 20. The shield 60 has a chamber 61, and a conductive cantilever 40 is disposed in the chamber 61, with the conductive cantilever 40 spaced apart from the shield 60. The shield 60 prevents electromagnetic interference from the external environment from affecting the conductive cantilever 40, preventing the conductive cantilever 40 from conducting or disconnecting the first electrode 41 and the second electrode 42 due to electromagnetic interference from the external environment. The spaced arrangement between the conductive cantilever 40 and the shield 60 reduces the likelihood of contact with the conductive cantilever 40 when the shield 60 is deformed by external forces, thus reducing damage to the conductive cantilever 40 when the shield 60 is deformed by external forces. The substrate 20 can seal the chamber 61, making the chamber 61 airtight, and the shield 60 can protect the conductive cantilever 40, reducing the impact of gases, dust, etc., from the external environment on the conductive cantilever 40.

[0071] In embodiments of the present invention, each charge transport layer 30 may be connected to one microelectromechanical structure (MEMS) or multiple MEMS structures connected in series. The MEMS structure can function as a MEMS switch 71, and the first electrode 41 and the second electrode 42 in the MEMS structure can be switched on or off via a conductive cantilever 40. For example... Figure 5 As shown, two MEMS switches 71 can be connected in series on each charge transport layer 30. When the two MEMS switches 71 are turned on at the same time, the charge on the charge transport layer 30 can be transferred out through the charge transport line 70. When one or both of the two MEMS switches 71 are turned off, the charge transport layer 30 is disconnected from the charge transport line 70, and the charge on the charge transport layer 30 cannot be transferred out through the charge transport line 70.

[0072] In some embodiments, such as Figures 4 to 6 As shown, the printed drum also includes a control circuit 80, which controls the MEMS switch 71 to be turned on or off. The control circuit 80 can be connected to the gate of the MEMS switch 71. The control circuit 80 controls the MEMS switch 71 to be turned on or off through the gate of the MEMS switch 71, so that the charge transport layer 30 and the charge transport line 70 are connected or disconnected. The control circuit 80 may include a first control line 81 and a second control line 82. The first control line 81 can control the MEMS switches 71 arranged in a column, and the second control line 82 can control the MEMS switches 71 arranged in a row. By controlling two MEMS switches 71 connected in series on the same charge transport layer 30 to be turned on simultaneously through the first control line 81 and the second control line 82, the charge on the charge transport layer 30 can be transferred out through the charge transport line 70.

[0073] The first control line 81 and the second control line 82 can be disposed on the substrate 20. An insulating layer 24 can be disposed on the substrate 20, and the insulating layer 24 can cover the second control line 82. The insulating layer 24 can be located between the second control line 82 and the third conductive layer 23 to achieve insulation. The insulating layer 24 can also cover the first control line 81 to achieve insulation.

[0074] This invention provides a printing device including the printing drum described in the above embodiments. The printing device having the printing drum described in the above embodiments has a long printing lifespan.

[0075] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A printing drum, characterized in that, include: A drum body, the surface of which is distributed with pixel structures, the pixel structures including a substrate and a charge transport layer, the substrate being disposed on the drum body, and the charge transport layer being disposed on the side of the substrate away from the drum body; A microelectromechanical structure (MEMS) includes a first electrode, a second electrode, and a conductive cantilever. The first electrode is electrically connected to the charge transport layer, and the conductive cantilever can connect or disconnect the first electrode from the second electrode.

2. The printing drum according to claim 1, characterized in that, One end of the conductive cantilever is electrically connected to the first electrode, and the other end of the conductive cantilever can be abutted against or moved away from the second electrode.

3. The printing drum according to claim 1, characterized in that, The microelectromechanical structure also includes: The third electrode is insulated from the conductive cantilever. When the third electrode and the conductive cantilever are charged, the third electrode drives the conductive cantilever to connect or disconnect the first electrode and the second electrode.

4. The printing drum according to claim 3, characterized in that, The microelectromechanical structure also includes: An insulating layer is provided on the substrate, comprising a first conductive layer, a second conductive layer, and a third conductive layer, wherein the insulating layer covers the first conductive layer, the second conductive layer, and the third conductive layer; The first electrode, the second electrode, and the third electrode are disposed on the side of the insulating layer away from the substrate. The first electrode is electrically connected to the first conductive layer, the second electrode is electrically connected to the second conductive layer, and the third electrode is electrically connected to the third conductive layer. The insulating layer has a first contact layer and a second contact layer on the side away from the substrate. The first contact layer is electrically connected to the first electrode, and the second contact layer is electrically connected to the second electrode. One end of the conductive cantilever is electrically connected to the second contact layer, and the other end of the conductive cantilever can abut against or move away from the first contact layer; or, one end of the conductive cantilever is electrically connected to the first contact layer, and the other end of the conductive cantilever can abut against or move away from the second contact layer.

5. The printing drum according to claim 4, characterized in that, The microelectromechanical structure also includes: A shielding body is disposed on the insulating layer. The shielding body has a cavity, and a conductive cantilever is disposed in the cavity. The conductive cantilever is spaced apart from the shielding body.

6. The printing drum according to claim 5, characterized in that, The third electrode, the first contact layer, and the second contact layer are located in the cavity, while the first electrode and the second electrode are located outside the cavity.

7. The printing drum according to claim 4, characterized in that, An insulating spacer layer is provided between adjacent electrodes of the first electrode, the second electrode, the third electrode, the first contact layer, and the second contact layer; and / or The first electrode, the second electrode, the third electrode, the first contact layer, and the second contact layer are disposed in the same layer.

8. The printing drum according to claim 3, characterized in that, The first electrode, the second electrode, and the third electrode are disposed in the same layer on the substrate.

9. The printing drum according to claim 1, characterized in that, The microelectromechanical structure also includes: The bottom electrode is disposed between the substrate and the charge transport layer, and the first electrode is disposed between the charge transport layer and the first electrode. The bottom electrode is electrically connected to the first electrode.

10. The printing drum according to claim 9, characterized in that, The microelectromechanical structure also includes: An insulating layer is disposed between the bottom electrode and the first electrode, and the insulating layer has a via, through which the bottom electrode and the first electrode are electrically connected.

11. The printing drum according to claim 1, characterized in that, The microelectromechanical structure also includes: A shielding body is disposed on the substrate, the shielding body has a cavity, a conductive cantilever is disposed in the cavity, and the conductive cantilever is spaced apart from the shielding body.

12. A printing device, characterized in that, Includes the printing drum according to any one of claims 1-11.

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