Knob display screen and household appliance

Abstract

The embodiment of the invention discloses a knob display screen and a household appliance, and relates to the technical field of knob display screens. The knob display screen comprises a knob assembly, a display screen and a conductive structure. The knob assembly comprises a fixing base, a driving circuit board and a knob shell. The display screen is installed on the side, away from the driving circuit board, of the fixing base. The display screen comprises a metal backboard, a lamp panel, a liquid crystal panel and a driving chip. The liquid crystal panel is arranged on the side, away from the metal backboard, of the lamp panel and comprises an array substrate and a liquid crystal layer, the array substrate and the liquid crystal layer are arranged in a stacked mode, and the array substrate is close to the metal backboard relative to the liquid crystal layer. The driving chip is arranged on the array substrate and located in the non-display area, and the driving chip is used for driving the array substrate. One end of the conductive structure is electrically connected with the grounding end, and the other end of the conductive structure passes through the fixed seat and is connected with the electric metal backboard. According to the embodiment of the invention, the risk that static electricity conducted to the display screen breaks down the driving chip can be reduced, and the reliability of the knob display screen can be improved.

Description

Technical Field

[0001] Embodiments of this application relate to the technical field of knob displays, and more particularly to a knob display and a home appliance. Background Technology

[0002] Home appliances may include a knob display screen, which may include a knob housing and a display screen, the knob housing surrounding the display screen, and the display screen including a driver chip.

[0003] The gap between the display screen and the knob housing is usually small, making it easy for static electricity to break down this gap and conduct to the display screen. The static electricity conducted to the display screen is released through the ground pin of the driver chip, increasing the risk of the driver chip being damaged by electrostatic discharge, leading to screen flickering or blackouts, and affecting the reliability of the knob display screen. Summary of the Invention

[0004] Embodiments of this application provide a rotary display screen and a home appliance that can reduce the risk of electrostatic discharge to the driver chip, thereby improving the reliability of the rotary display screen.

[0005] One embodiment of this application provides a rotary display screen. The rotary display screen includes a rotary assembly, a display screen, and a conductive structure. The rotary assembly includes a mounting base, a driving circuit board, and a rotary housing. The driving circuit board is disposed on one side of the mounting base along its thickness direction, and a ground terminal is provided on the driving circuit board. The rotary housing surrounds the driving circuit board and the mounting base, and is rotatable relative to the driving circuit board and the mounting base. The display screen is mounted on the side of the mounting base away from the driving circuit board, and the display screen is divided into a display area and a non-display area, with the non-display area surrounding the display area. The display screen includes a metal backplate, a lamp board, a liquid crystal panel, and a driving chip. The lamp board is disposed on one side of the metal backplate along its thickness direction. The liquid crystal panel is disposed on the side of the lamp board away from the metal backplate, and the liquid crystal panel includes an array substrate and a liquid crystal layer, which are stacked, with the array substrate closer to the metal backplate than the liquid crystal layer. The array substrate is used to drive the liquid crystal molecules in the liquid crystal layer to deflect. The driving chip is disposed on the array substrate and located in the non-display area, and the driving chip is used to drive the array substrate. One end of the conductive structure is electrically connected to the grounding terminal, and the other end of the conductive structure passes through the mounting base and is electrically connected to the metal back plate.

[0006] In the embodiments of this application, the conductive structure can ground the metal backplate. In this way, when static electricity is conducted to the display screen, it is conducted through the metal backplate to the ground terminal of the drive circuit board and released through the ground terminal of the drive circuit board. That is, the metal backplate of the display screen not only serves to support other components of the display screen but also acts as part of the static electricity discharge path.

[0007] Compared to static electricity being conducted through the grounding pin of the driver chip to the grounding terminal of the driver circuit board, the embodiments of this application use a metal backplate and conductive structure to release static electricity, which shortens the static electricity release path and eliminates the need for static electricity to be released through the driver chip. This protects the driver chip, reduces the risk of electrostatic discharge damaging the driver chip and causing the display screen to distort or go black, and improves the reliability of the rotary display screen.

[0008] Furthermore, the above-mentioned method of releasing static electricity eliminates the need for complex components or mechanical structures, thus reducing the cost of the knob display screen.

[0009] In some possible implementations, the conductive structure includes at least one of conductive foam and wire.

[0010] This design improves the flexibility of the conductive structure and meets different needs.

[0011] In some possible implementations, the ground terminal of the drive circuit board includes a ground pad, which is disposed on the surface of the drive circuit board near the metal backplate. When the conductive structure includes conductive foam, the length of the conductive foam in its natural state along the thickness direction of the metal backplate is greater than the distance between the ground pad and the metal backplate.

[0012] This configuration allows for an interference fit between the conductive foam and the drive circuit board and the metal backplate, thereby improving the reliability of the connection between the conductive foam and the grounding pad and the metal backplate.

[0013] In some possible implementations, the difference between the length of the conductive foam in its natural state and the distance between the grounding pad and the metal backplate along the thickness direction of the metal backplate is greater than or equal to 2 mm.

[0014] This configuration avoids the difference between the length of the conductive foam in its natural state and the distance between the grounding pad and the metal backplate being too small, which helps to improve the connection reliability between the conductive foam and the grounding pad and the metal backplate.

[0015] In some possible implementations, the conductive foam is cylindrical, with its cross-section perpendicular to the thickness direction of the metal backing plate, and the diameter of the conductive foam's cross-section ranging from 5 mm to 10 mm.

[0016] Setting the diameter of the conductive foam's cross-section within the range of 5mm to 10mm avoids making the diameter too large (e.g., greater than 10mm), thus reducing the space occupied by the conductive foam. Furthermore, setting the diameter within this range also prevents the diameter from being too small (e.g., less than 5mm), ensuring the conductive effect of the foam and allowing static electricity to be quickly released, thereby improving the reliability of the rotary display screen.

[0017] In some possible implementations, the mounting base includes a support plate disposed between a metal backplate and a drive circuit board. The support plate has a clearance through-hole extending through it along its thickness. One end of the conductive structure, away from the drive circuit board, is embedded in the clearance through-hole and electrically connected to the metal backplate. At least a portion of the grounding pad is positioned opposite the clearance through-hole.

[0018] Understandably, through holes are made in the support plate to allow the conductive structure to pass through the mounting base and connect to the metal back plate.

[0019] At least a portion of the grounding pad is positioned opposite to the clearance through hole, so that the conductive structure can be connected to the grounding pad and the metal back plate by extending along the thickness direction of the metal back plate (i.e., the extension direction of the rotating shaft). This helps to reduce the length of the conductive structure, shorten the static discharge path, and improve the reliability of the knob display.

[0020] In some possible implementations, the knob assembly further includes a rotating connector, a bracket, an encoder circuit board, and a rotary encoder. A portion of the rotating connector is located on the inner circumference of the knob housing and connected to the knob housing. The bracket is connected to the side of the mounting base away from the display screen; the rotating connector surrounds the bracket and is rotatable relative to the bracket. The encoder circuit board is located on the side of the drive circuit board away from the mounting base and is electrically connected to the drive circuit board. The rotary encoder is electrically connected to the encoder circuit board; the rotary encoder includes a fixed ring and a rotating ring. The fixed ring is connected to the bracket. The rotating ring is connected to the rotating connector, and the rotating ring and fixed ring are rotatably connected. When the rotating ring rotates relative to the fixed ring, the rotary encoder sends a rotation signal to the encoder circuit board.

[0021] Understandably, the fixed ring and the bracket are connected, and the rotating ring, the rotating connector, and the knob housing are connected, so that when the user rotates the knob housing, the knob housing can drive the rotating connector and the rotating ring to rotate, thereby allowing the rotating ring to rotate relative to the fixed ring. This enables the rotary encoder to send a rotation signal to the encoder circuit board, and the drive signal can be transmitted to the drive circuit board via the encoder circuit board.

[0022] The electronic components of the drive circuit board may include a controller, a rotary encoder, and an electrical connection to the drive circuit board, enabling users to control home appliances by turning the knob housing.

[0023] In some possible implementations, the display screen also includes a flexible circuit board, one end of which is electrically connected to the array substrate, and the other end of which is electrically connected to the drive circuit board.

[0024] One end of the flexible circuit board is electrically connected to the glass backplane of the array substrate, enabling the flexible circuit board to be electrically connected to thin-film transistors and driver chips. The other end of the flexible circuit board is electrically connected to the driver circuit board, enabling the flexible circuit board to be electrically connected to the electronic components of the driver circuit board. Understandably, the electronic components can drive the driver chip, allowing the driver chip to drive the thin-film transistors.

[0025] In some possible implementations, the display screen is circular in shape.

[0026] Understandably, compared to square displays, round displays have a larger display interface and display more content, which can improve the display effect of knob displays.

[0027] On the other hand, embodiments of this application provide a home appliance. The home appliance includes a housing and a knob display screen as described above, the knob display screen being disposed on the housing.

[0028] The home appliances provided in the embodiments of this application include the knob display screen as described above, and therefore have all the above-described beneficial effects, which will not be repeated here. Attached Figure Description

[0029] Figure 1 This application provides schematic diagrams of the structure of household appliances according to some embodiments; Figure 2 This is a schematic diagram of the structure of a knob display screen provided in some embodiments of this application; Figure 3 An exploded view of the knob display screen in some embodiments; Figure 4 for Figure 2 An exploded view of the knob display screen in some other embodiments; Figure 5 This is a schematic diagram of the structure of a knob assembly provided in some embodiments of this application; Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of the knob assembly along the A1-A1 direction; Figure 7 This is a schematic diagram of the structure of the fixing base provided in some embodiments of this application; Figure 8This is a schematic diagram illustrating the positional relationship between the display area and the non-display area provided in some embodiments of this application; Figure 9 Schematic block diagrams of the display screen provided in some embodiments of this application; Figure 10 This application provides schematic diagrams of the structure of a display screen for some embodiments. Figure 11 This is a schematic diagram of the structure of a driver circuit board provided in some embodiments of this application; Figure 12 This is a schematic diagram of the structure of a rotary encoder provided in some embodiments of this application.

[0030] Explanation of icon numbers: 300-Knob display screen, 100-Knob assembly, 110-Mounting base, 111-Support plate, 112-Side wall, 113-Mounting ring, 120-Drive circuit board, 121-Drive circuit board body, 122-Grounding pad, 123-Electronic component, 130-Knob housing, 140-Rotating connector, 150-Bracket, 151-Bracket body, 152-Connecting claw, 160-Rotary encoder, 161-Fixing ring, 1611-First fixing ring, 1612-Second fixing ring, 162-Rotating ring 170 - Encoder circuit board, 200 - Display screen, 210 - Metal backplate, 220 - Lamp board, 230 - LCD panel, 231 - Array substrate, 232 - LCD layer, 2321 - Liquid crystal molecule, 240 - Driver chip, 250 - Color filter, 260 - Glass cover, 270 - Black glue, 310 - Conductive structure, 311 - Conductive foam, 320 - Flexible circuit board, 400 - Home appliance, 410 - Housing, Q - Shaft, P - Clearance through hole, C - Mounting surface, M1 - Display area, M2 - Non-display area. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all possible embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0033] As used herein, terms such as “equal,” “parallel,” and “perpendicular” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “equal” includes absolute equality and approximate equality, where an acceptable range of deviation for approximate equality may be, for example, a difference between the two equal items less than or equal to 5% of either one.

[0034] In the embodiments of this application, the directional indications used to explain the structure and movement of different components, such as up, down, left, right, front, and back, are relative. These indications are appropriate when the components are in the positions shown in the figures. However, if the description of the component positions changes, these directional indications will also change accordingly.

[0035] Figure 1 The diagram shows the structure of a household appliance provided in some embodiments of this application. Figure 1 As shown, an embodiment of this application provides a home appliance 400. The home appliance 400 can be a washing machine, microwave oven, refrigerator, etc., and the embodiments of this application do not further limit the specific form of the home appliance 400.

[0036] In some examples, such as Figure 1 As shown, the home appliance 400 may include a housing 410 and a knob display screen 200, which is disposed on the housing 410.

[0037] For example, the knob display screen 200 can be mounted on the housing 410 by snap-fit ​​or by adhesive. The embodiments of this application do not further limit the specific manner in which the knob display screen 200 is mounted on the housing 410.

[0038] Figure 2 This is a schematic diagram of the structure of a rotary display screen provided in some embodiments of this application. Figure 3 The rotary display screen in some embodiments is shown in an exploded structural diagram. Figure 4 for Figure 2 The rotary display screen is shown in an exploded structural diagram in some other embodiments.

[0039] In some examples, such as Figure 2 , Figure 3 and Figure 4 As shown, the knob display screen 200 includes a knob assembly 100 and a display screen 200.

[0040] For example, a user can control a home appliance 400 by rotating a knob assembly 100. The display screen 200 can display the execution program, running time, and running status of the home appliance 400 after the knob assembly 100 is rotated. The embodiments of this application do not further limit the image information displayed on the display screen 200.

[0041] Figure 5 This is a schematic diagram of the structure of a knob assembly provided in some embodiments of this application. Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of the knob assembly along the A1-A1 direction.

[0042] In some examples, such as Figure 4 , Figure 5 and Figure 6 As shown, the knob assembly 100 may include a mounting base 110, a drive circuit board 120, and a knob housing 130. The drive circuit board 120 is disposed on one side of the mounting base 110 along the thickness direction of the mounting base 110.

[0043] like Figure 4 As shown, the drive circuit board 120 may include a drive circuit board body 121 and an electronic component 123, with the electronic component 123 disposed on the drive circuit board body 121. For example, the electronic component 123 may be disposed on the side of the drive circuit board body 121 near the mounting base 110.

[0044] The driving circuit board body 121 can be at least one of a printed circuit board (PCB) and a flexible printed circuit (FPC). The embodiments of this application do not further limit the specific form of the driving circuit board body 121.

[0045] In some examples, such as Figure 4 and Figure 6 As shown, the knob housing 130 surrounds the drive circuit board 120 and the mounting base 110, and is rotatable relative to the drive circuit board 120 and the mounting base 110.

[0046] Understandably, the knob housing 130 is an external component, and the user can operate the home appliance 400 by rotating the main knob housing 130. When the knob housing 130 is rotated, the mounting base 110 can remain stationary.

[0047] For example, the knob housing 130 can rotate about the pivot Q relative to the drive circuit board 120 and the mounting base 110.

[0048] The shape of the drive circuit board body 121 in the XY plane can be circular or approximately circular to reduce the risk of the knob housing 130 rubbing against the drive circuit board body 121 when rotating, and to increase the area of ​​the drive circuit board body 121.

[0049] Alternatively, the shape of the drive circuit board body 121 in the XY plane can also be other shapes. The embodiments of this application do not further limit the shape of the drive circuit board body 121 in the XY plane.

[0050] Understandably, the extension direction of the rotating shaft Q and the thickness direction of the fixed base 110 are in the same direction. The XY plane is perpendicular or approximately perpendicular to the extension direction of the rotating shaft Q. That is, the angle between the XY plane and the extension direction of the rotating shaft Q can be 90°, 88°, or 89°, etc.

[0051] In some examples, the display 200 is mounted on the side of the mounting base 110 away from the drive circuit board 120.

[0052] For example, the display screen 200 can be installed on the side of the mounting base 110 away from the driving circuit board 120 by snap-fit, or the display screen 200 can also be installed on the side of the mounting base 110 away from the driving circuit board 120 by adhesive. The embodiments of this application do not further limit the installation method between the display screen 200 and the mounting base 110.

[0053] Figure 7 This is a schematic diagram of the structure of the fixing base provided in some embodiments of this application.

[0054] In some examples, such as Figure 7 As shown, the mounting base 110 may include a support plate 111, a side wall 112, and a mounting ring 113. The side wall 112 surrounds and is connected to the support plate 111. The mounting ring 113 is located on one side of the support plate 111 along the thickness direction of the support plate 111 and is connected to the edge of the side wall 112.

[0055] The surface of the mounting ring 113 away from the side wall 112 is the mounting surface C, which is parallel to the XY plane. The display screen 200 can be bonded to the mounting surface C.

[0056] Figure 8 This is a schematic diagram illustrating the positional relationship between the display area and the non-display area provided in some embodiments of this application.

[0057] In some examples, such as Figure 8As shown, the display screen 200 is divided into a display area M1 and a non-display area M2, with the non-display area M2 surrounding the display area M1. It is understood that the display area M1 can display image information, while the non-display area M2 cannot display image information; the non-display area M2 is the edge area of ​​the display screen 200.

[0058] Figure 9 This is a schematic block diagram illustrating the structure of a display screen provided in some embodiments of this application. In some examples, such as... Figure 9 As shown, the display screen 200 includes a metal backplate 210, a backlight panel 220, a liquid crystal panel 230, and a driver chip 240.

[0059] The lamp panel 220 is disposed on one side of the metal back plate 210 along the thickness direction of the metal back plate 210. The LCD panel 230 is disposed on the side of the lamp panel 220 away from the metal back plate 210.

[0060] Understandably, the thickness direction of the metal backplate 210 and the extension direction of the pivot Q are in the same direction. The metal backplate 210 can support other components of the display screen 200, which helps to improve the mechanical strength of the display screen 200.

[0061] The material of the metal backplate 210 may include at least one of copper, gold, silver and aluminum. The embodiments of this application do not further limit the material of the metal backplate 210.

[0062] For example, the light panel 220 may include a light emitting diode (LED). The light panel 220 may be a direct-lit light panel, or it may be a side-lit light panel.

[0063] Understandably, when the lamp panel 220 is a direct-lit lamp panel, the liquid crystal panel 230 is disposed on the side of the lamp panel 220 away from the metal back plate 210. When the lamp panel 220 is a side-lit lamp panel, the display screen 200 may further include a light guide plate, which may be disposed on one side of the lamp panel 220 along a first direction, which is any direction in the XY plane. The liquid crystal panel 230 is disposed on the side of the lamp panel 220 and the light guide plate away from the metal back plate 210, and the light guide plate can guide the light emitted from the lamp panel 220 to the liquid crystal panel 230.

[0064] Continue to refer to Figure 9 In some examples, the liquid crystal panel 230 includes an array substrate 231 and a liquid crystal layer 232, which are stacked together. The array substrate 231 is close to the metal backplate 210 relative to the liquid crystal layer 232. The array substrate 231 is used to drive the liquid crystal molecules 2321 in the liquid crystal layer 232 to deflect.

[0065] For example, the array substrate 231 may include a glass backplane and a thin film transistor (TFT), with the TFT disposed on the glass backplane. The TFT can apply a deflection voltage to the liquid crystal molecules 2321 in the liquid crystal layer 232, causing the liquid crystal molecules 2321 to deflect under the influence of the deflection voltage, thereby adjusting the brightness of light passing through the liquid crystal layer 232.

[0066] The driver chip 240 is disposed on the array substrate 231 and located in the non-display area M2. The driver chip 240 is used to drive the array substrate 231.

[0067] For example, the driver chip 240 can be bonded to the glass backplane, enabling the driver chip 240 to drive the driving thin-film transistors of the array substrate 231.

[0068] The driver chip 240 can be bonded to the glass backplane using chip-on-film (COF) or chip-on-glass (COG) processes. Alternatively, the driver chip 240 can be bonded to the glass backplane using other processes. The embodiments of this application do not further limit the specific method of bonding the driver chip 240 to the glass backplane.

[0069] Understandably, the driver chip 240 is located in the non-display area M2, which can reduce the impact of the driver chip 240 on the display screen 200 for image display.

[0070] For example, a display screen including a TFT and a liquid crystal layer 232 can be referred to as a TFT display screen. Compared to light-emitting diode (LED) displays, TFT displays offer better display performance.

[0071] Continue to refer to Figure 9 The display screen 200 may also include a color filter 250, on which multiple red pixels, multiple green pixels and multiple blue pixels are arranged in an array. Understandably, the red pixels are used to transmit red light, the green pixels are used to transmit green light, and the blue pixels are used to transmit blue light. In this way, red light, green light and blue light can pass through the color filter 250 respectively, thereby enabling the display screen 200 to achieve full-color display.

[0072] The display screen 200 may also include a black adhesive 270, which surrounds the liquid crystal layer 232 and adheres the color filter 250 and the array substrate 231. Understandably, the black adhesive 270 is disposed in the non-display area M2.

[0073] The display screen 200 may also include a glass cover 260, which is disposed on the side of the color filter 250 away from the liquid crystal panel 230, and serves to protect components such as the color filter 250, the liquid crystal panel 230, and the backlight panel 220. The glass cover 260 may be a transparent glass piece to reduce the obstruction of light caused by the glass cover 260.

[0074] The display screen 200 may also include an optical film layer and a polarizer. The optical film layer may include diffusers, prisms, and light-diffusing sheets, etc., and may be disposed between the lamp panel 220 and the liquid crystal panel 230 to achieve functions such as uniform light distribution and improved brightness. The polarizer may include a first polarizer and a second polarizer, which are respectively disposed on both sides of the liquid crystal layer 232.

[0075] It is understood that the display screen 200 may also include other components besides those described above, and the embodiments of this application do not further limit the specific structure of the display screen 200.

[0076] Figure 10 This is a schematic diagram of the structure of a display screen provided for some embodiments of this application. In some examples, such as... Figure 10 As shown, the display screen 200 also includes a flexible circuit board 320, one end of which is electrically connected to the array substrate 231, and the other end of which is electrically connected to the drive circuit board 120.

[0077] One end of the flexible circuit board 320 is electrically connected to the array substrate 231, enabling the flexible circuit board 320 to be electrically connected to the thin film transistor and the driver chip 240.

[0078] For example, the flexible circuit board 320 can be bonded to the glass backplane of the array substrate 231. For instance, the flexible circuit board 320 can be bonded to the glass backplane using a film-on-glass (FOG) process, or the flexible circuit board 320 can be bonded to the glass backplane using other processes. The embodiments of this application do not further limit the process of bonding the flexible circuit board 320 to the glass backplane.

[0079] The other end of the flexible circuit board 320 is electrically connected to the drive circuit board 120, enabling the flexible circuit board 320 to be electrically connected to the electronic component 123. Understandably, the electronic component 123 can drive the drive chip 240, enabling the drive chip 240 to drive the thin-film transistor.

[0080] For example, such as Figure 10As shown, the flexible circuit board 320 can be bent and extended to the side of the metal backplate 210 away from the lamp board 220, so that the flexible circuit board 320 can be electrically connected to the drive circuit board 120. For example, a plug can be provided on the side of the flexible circuit board 320 away from the array substrate 231, and a socket can be provided on the drive circuit board body 121, so that the plug can be inserted into the socket, thereby enabling the flexible circuit board 320 to be electrically connected to the drive circuit board 120.

[0081] Alternatively, the flexible circuit board 320 and the driving circuit board 120 can be electrically connected in other ways. The embodiments of this application do not further limit the electrical connection method between the flexible circuit board 320 and the driving circuit board 120.

[0082] For example, electronic component 123 may include chips, controllers, capacitors and resistors, etc. The embodiments of this application do not further limit the specific form of electronic component 123.

[0083] In some examples, the driver circuit board 120 is provided with a ground terminal and a power supply terminal. The driver chip 240 can be electrically connected to the ground terminal and the power supply terminal through the flexible circuit board 320, so that the power supply terminal can supply power to the driver chip 240 and the driver chip 240 can be grounded through the ground terminal.

[0084] In some examples, such as Figure 8 and Figure 10 As shown, the display screen 200 is circular in shape.

[0085] Understandably, compared to the square display screen 200, the circular display screen 200 has a larger display interface and richer display content, which can improve the display effect of the knob display screen 200.

[0086] Understandably, such as Figure 8 As shown, the gap between the display screen 200 and the knob housing 130 is small. When the user touches the knob housing 130 and conducts static electricity to the knob housing 130, the static electricity can easily break through the gap between the display screen 200 and the knob housing 130 and be conducted to the display screen 200.

[0087] The driver chip 240 is located in the non-display area M2, that is, near the edge of the display screen 200. Static electricity conducted to the display screen 200 will be released through the ground pin of the driver chip 240, which increases the risk of the driver chip 240 being damaged by electrostatic discharge, causing the display screen 200 to display a distorted or black screen, thus affecting the reliability of the knob display screen 200.

[0088] Based on this, in the embodiments of this application, such as Figure 3 and Figure 4As shown, the rotary display screen 200 also includes a conductive structure 310. One end of the conductive structure 310 is electrically connected to the ground terminal of the drive circuit board 120, and the other end of the conductive structure 310 passes through the mounting base 110 and is electrically connected to the metal back plate 210.

[0089] In the embodiments of this application, the conductive structure 310 can ground the metal backplate 210. In this way, when static electricity is conducted to the display screen 200, the static electricity will be conducted through the metal backplate 210 to the ground terminal of the drive circuit board 120, and then released through the ground terminal of the drive circuit board 120. That is to say, the metal backplate 210 of the display screen 200 not only serves to support other components of the display screen 200, but also serves as part of the static electricity discharge path.

[0090] Compared to static electricity being conducted to the ground terminal of the driver circuit board 120 via the ground pin of the driver chip 240 and the flexible circuit board 320, the embodiments of this application use a metal backplate 210 and a conductive structure 310 to release static electricity, which shortens the static electricity release path and eliminates the need for static electricity to be released via the driver chip 240. This protects the driver chip 240, reduces the risk of electrostatic discharge damaging the driver chip 240 and causing the display screen 200 to display a distorted or black screen, and improves the reliability of the knob display screen 200.

[0091] Furthermore, the above-mentioned method of releasing static electricity eliminates the need for complex components or mechanical structures, thus reducing the cost of the knob display screen 200.

[0092] In some examples, the conductive structure 310 includes at least one of a conductive foam 311 and a wire.

[0093] This design improves the flexibility of the conductive structure 310 and meets different needs.

[0094] Figure 11 This is a schematic diagram of the structure of a driver circuit board provided in some embodiments of this application.

[0095] In some examples, such as Figure 11 As shown, the ground terminal of the drive circuit board 120 includes a ground pad 122, which is disposed on the surface of the drive circuit board 120 near the metal backplate 210. For example, the ground pad 122 may be a copper foil.

[0096] When the conductive structure 310 includes conductive foam 311, the conductive foam 311 can be bonded to the grounding pad 122 and the metal backplate 210 with conductive adhesive to improve the ease of connection between the conductive foam 311 and the grounding pad 122 and the metal backplate 210.

[0097] When the conductive structure 310 includes a wire, the wire can be connected to the grounding pad 122 and the metal backplate 210 by soldering to improve the connection reliability between the wire and the grounding pad 122 and the metal backplate 210.

[0098] In some examples, when the conductive structure 310 includes conductive foam 311, the length of the conductive foam 311 in its natural state is greater than the distance between the ground pad 122 and the metal backplate 210 along the thickness direction of the metal backplate 210 (i.e., the extension direction of the shaft Q).

[0099] Understandably, along the thickness direction of the metal backplate 210, the length of the conductive foam 311 in its natural state is greater than the distance between the grounding pad 122 and the metal backplate 210, so that the conductive foam 311 can be interference-fitted with the drive circuit board 120 and the metal backplate 210, thereby improving the connection reliability between the conductive foam 311 and the grounding pad 122 and the metal backplate 210.

[0100] In some examples, the difference between the length of the conductive foam 311 in its natural state and the distance between the grounding pad 122 and the metal backplate 210 along the thickness direction of the metal backplate 210 is greater than or equal to 2 millimeters (mm).

[0101] Understandably, along the thickness direction of the metal backplate 210, the difference between the length of the conductive foam 311 in its natural state and the distance between the grounding pad 122 and the metal backplate 210 can be 3mm, 4mm, or 5mm, etc. The embodiments of this application do not further limit the value of the difference between the length of the conductive foam 311 in its natural state and the distance between the grounding pad 122 and the metal backplate 210.

[0102] Setting the difference between the length of the conductive foam 311 in its natural state and the distance between the grounding pad 122 and the metal backplate 210 to be greater than or equal to 2 mm can prevent the difference between the length of the conductive foam 311 in its natural state and the distance between the grounding pad 122 and the metal backplate 210 from being too small, which is beneficial to improving the connection reliability between the conductive foam 311 and the grounding pad 122 and the metal backplate 210.

[0103] In some examples, such as Figure 3 and Figure 4 As shown, the conductive foam 311 is cylindrical, and the cross-section of the conductive foam 311 is perpendicular to the thickness direction of the metal back plate 210 (i.e., the extension direction of the rotating shaft Q). The diameter of the cross-section of the conductive foam 311 ranges from 5 mm to 10 mm.

[0104] Understandably, the conductive foam 311 has a circular cross-section. Setting the diameter of the conductive foam 311's cross-section within the range of 5mm to 10mm avoids an excessively large diameter (e.g., greater than 10mm), thus reducing the space occupied by the conductive foam 311. Furthermore, setting the diameter of the conductive foam 311 within the range of 5mm to 10mm also avoids an excessively small diameter (e.g., less than 5mm), ensuring the conductive effect of the conductive foam 311 and allowing static electricity to be quickly released through it, thereby improving the reliability of the rotary display screen 200.

[0105] Understandably, the conductive foam 311 can also be in other shapes besides cylindrical, such as cuboid, frustum, etc. The embodiments of this application do not further limit the shape of the conductive foam 311.

[0106] Continue to refer to Figure 4 In some examples, a support plate 111 is disposed between a metal back plate 210 and a drive circuit board 120. The support plate 111 has a clearance through hole P that extends through the support plate 111 along its thickness direction. The end of the conductive structure 310 away from the drive circuit board 120 is embedded in the clearance through hole P and is electrically connected to the metal back plate 210.

[0107] When the conductive structure 310 includes conductive foam 311, the shape of the clearance through-hole P and the shape of the conductive foam 311 can be the same or different. Along the radial direction of the conductive foam 311, the conductive foam 311 can be completely embedded in the clearance through-hole P and connected to the metal back plate 210, or, along the radial direction of the conductive foam 311, the conductive foam 311 can also be partially embedded in the clearance through-hole P and connected to the metal back plate 210. The embodiments of this application do not further limit this.

[0108] When the conductive structure 310 includes a wire, one end of the wire can be soldered to the grounding pad 122, and the other end can pass through the clearance through hole P and be soldered to the metal back plate 210.

[0109] Understandably, a clearance through hole P is provided on the support plate 111 so that the conductive structure 310 can pass through the fixing base 110 and be electrically connected to the metal back plate 210.

[0110] In some examples, at least a portion of the grounding pad 122 is positioned opposite to the clearance via P.

[0111] Understandably, at least a portion of the grounding pad 122 is positioned opposite to the clearance through hole P, so that the conductive structure 310 can be extended along the thickness direction of the metal back plate 210 (i.e., the extension direction of the rotating shaft Q) to connect the grounding pad 122 and the metal back plate 210. This helps to reduce the length of the conductive structure 310, shorten the static discharge path, and improve the reliability of the knob display screen 200.

[0112] In some examples, such as Figure 4 As shown, the knob assembly 100 also includes a rotation connector 140, a bracket 150, an encoder circuit board 170, and a rotary encoder 160.

[0113] In some examples, a portion of the rotating connector 140 is located on the inner circumferential side of the knob housing 130 and is connected to the knob housing 130.

[0114] For example, the rotating connector 140 can be connected to the knob housing 130 by snap-fit, or the rotating connector 140 can be connected to the knob housing 130 by adhesive bonding. The embodiments of this application do not further limit the connection method between the rotating connector 140 and the knob housing 130.

[0115] Understandably, the rotating connector 140 is connected to the knob housing 130 so that when the user rotates the knob housing 130, the knob housing 130 can drive the rotating connector 140 to rotate synchronously.

[0116] In some examples, the bracket 150 is connected to the side of the mounting base 110 away from the display screen 200, and the rotating connector 140 surrounds the bracket 150 and is rotatable relative to the bracket 150.

[0117] Understandably, the bracket 150 serves as a support for the knob assembly 100 to enhance its mechanical strength. The bracket 150 may be connected to the side wall 112 of the mounting base 110, or it may be connected to other components of the mounting base 110, such as the support plate 111 or the mounting ring 113.

[0118] For example, the bracket 150 can be connected to the fixing base 110 by snap-fit, or the bracket 150 can be connected to the fixing base 110 by adhesive. The embodiments of this application do not further limit the connection method between the bracket 150 and the fixing base 110.

[0119] Understandably, the bracket 150 is connected to the side of the mounting base 110 away from the display screen 200, which can reduce the mutual influence between the bracket 150 and the display screen 200.

[0120] For example, such as Figure 4As shown, the bracket 150 may include a bracket body 151 and a connecting claw 152. The bracket body 151 is connected to the fixing seat 110, and the connecting claw 152 is connected to the side of the bracket body 151 away from the fixing seat 110. The connecting claw 152 is used to connect to the housing 410.

[0121] For example, the connecting claw 152 can be connected to the housing 410 by snap-fit, or the connecting claw 152 can be connected to the housing 410 by adhesive. The embodiments of this application do not further limit the connection method between the bracket 150 and the housing 410.

[0122] When the user rotates the knob housing 130, which in turn drives the rotating connector 140 to rotate, the bracket 150, the fixed base 110, and the display screen 200 can remain stationary. The knob housing 130 and the rotating connector 140 can rotate relative to the bracket 150, the fixed base 110, and the display screen 200.

[0123] In some examples, the encoder circuit board 170 is located on the side of the drive circuit board 120 away from the mounting base 110, and the encoder circuit board 170 and the drive circuit board 120 are electrically connected.

[0124] The encoder circuit board 170 can be circular or square in the XY plane. The embodiments of this application do not further limit the shape of the encoder circuit board 170 in the XY plane.

[0125] For example, the drive circuit board 120 and the encoder circuit board 170 can be spaced apart on the side of the bracket body 151 away from the fixing seat 110, and the connecting claw 152 can pass through the drive circuit board 120 and the encoder circuit board 170 and be connected to the housing 410.

[0126] For example, the knob assembly 100 may also include a connecting pin disposed between the encoder circuit board 170 and the drive circuit board 120, and electrically connecting the encoder circuit board 170 and the drive circuit board 120.

[0127] Understandably, the pins can support the encoder circuit board 170 and the drive circuit board 120, and also provide electrical connection between the encoder circuit board 170 and the drive circuit board 120.

[0128] Alternatively, the encoder circuit board 170 and the drive circuit board 120 can be electrically connected in other ways. The embodiments of this application do not further limit the way the encoder circuit board 170 and the drive circuit board 120 are electrically connected.

[0129] Understandably, the rotary encoder 160 can convert the displacement of the knob housing 130 into a rotation signal, which is an electrical signal. For example, the rotation signal can be a voltage signal or a current signal, and the embodiments of this application do not further limit the specific form of the rotation signal.

[0130] In some examples, the rotary encoder 160 and the encoder circuit board 170 are electrically connected. Understandably, the encoder circuit board 170 and the drive circuit board 120 are electrically connected, so that rotation signals can be transmitted from the encoder circuit board 170 to the drive circuit board 120.

[0131] The electronic components 123 of the drive circuit board 120 may include a controller, which electrically connects the rotary encoder 160 and the encoder circuit board 170, enabling the user to control the home appliance 400 by turning the knob housing 130.

[0132] For example, the rotary encoder 160 can be positioned between the encoder circuit board 170 and the drive circuit board 120, and fitted onto a pin. Alternatively, the rotary encoder 160 can be positioned in other locations. The structure of the rotary encoder 160 is illustrated below.

[0133] Figure 12 This is a schematic diagram of the structure of a rotary encoder provided in some embodiments of this application.

[0134] In some examples, such as Figure 12 As shown, the rotary encoder 160 includes a fixed ring 161 and a rotating ring 162.

[0135] The fixed ring 161 is connected to the bracket 150, and the rotating ring 162 is connected to the rotating connector 140, with the rotating ring 162 and the fixed ring 161 rotatably connected. When the rotating ring 162 rotates relative to the fixed ring 161, the rotary encoder 160 sends a rotation signal to the encoder circuit board 170.

[0136] Understandably, the fixed ring 161 is connected to the bracket 150, and the rotating ring 162 is connected to the rotating connector 140, so that when the knob housing 130 drives the rotating connector 140 to rotate, the rotating connector 140 can drive the rotating ring 162 to rotate, thereby enabling the rotating ring 162 to rotate relative to the fixed ring 161, so that the rotary encoder 160 can send a rotation signal to the encoder circuit board 170, and the rotation signal can be transmitted to the drive circuit board 120 via the encoder circuit board 170.

[0137] For example, such as Figure 12As shown, the fixing ring 161 may include a first fixing ring 1611 and a second fixing ring 1612, with the second fixing ring 1612 surrounding the first fixing ring 1611. The rotating ring 162 is disposed between the first fixing ring 1611 and the second fixing ring 1612, and is rotatably connected to the first fixing ring 1611 and the second fixing ring 1612.

[0138] Alternatively, the fixed ring 161 can also be a single-ring structure. The embodiments of this application do not further limit the specific structure of the fixed ring 161 and the rotating ring 162.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or as many of the technical features as possible; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A rotary display screen, characterized in that, The rotary display screen includes: The knob assembly includes: Fixed base; A drive circuit board is disposed on one side of the fixed base along the thickness direction of the fixed base, and a ground terminal is provided on the drive circuit board; The knob housing surrounds the drive circuit board and the mounting base, and is rotatable relative to the drive circuit board and the mounting base; A display screen is mounted on the side of the mounting base away from the drive circuit board. The display screen is divided into a display area and a non-display area, with the non-display area surrounding the display area. The display screen includes: Metal back panel; The lamp panel is disposed on one side of the metal back plate along the thickness direction of the metal back plate; A liquid crystal panel is disposed on the side of the lamp panel away from the metal back plate. The liquid crystal panel includes an array substrate and a liquid crystal layer. The array substrate and the liquid crystal layer are stacked together, and the array substrate is closer to the metal back plate relative to the liquid crystal layer. The array substrate is used to drive the liquid crystal molecules in the liquid crystal layer to deflect. A driver chip is disposed on the array substrate and located in the non-display area; the driver chip is used to drive the array substrate. A conductive structure, one end of which is electrically connected to the grounding terminal, and the other end of which passes through the fixing base and is electrically connected to the metal back plate.

2. The rotary display screen according to claim 1, characterized in that, The conductive structure includes at least one of conductive foam and a wire.

3. The rotary display screen according to claim 2, characterized in that, The grounding terminal of the drive circuit board includes a grounding pad, which is disposed on the surface of the drive circuit board near the metal backplate. When the conductive structure includes the conductive foam, the length of the conductive foam in its natural state is greater than the distance between the grounding pad and the metal backing plate along the thickness direction of the metal backing plate.

4. The rotary display screen according to claim 3, characterized in that, Along the thickness direction of the metal backplate, the difference between the length of the conductive foam in its natural state and the distance between the grounding pad and the metal backplate is greater than or equal to 2 mm.

5. The rotary display screen according to claim 3, characterized in that, The conductive foam is cylindrical, and the cross-section of the conductive foam is perpendicular to the thickness direction of the metal backing plate. The diameter of the cross-section of the conductive foam ranges from 5 mm to 10 mm.

6. The rotary display screen according to claim 3, characterized in that, The fixing base includes: A support plate is disposed between the metal back plate and the drive circuit board. The support plate has a clearance through hole that extends through the support plate along its thickness direction. The end of the conductive structure away from the drive circuit board is embedded in the clearance through hole and electrically connected to the metal back plate. At least a portion of the grounding pad is positioned opposite to the clearance through hole.

7. The rotary display screen according to claim 1, characterized in that, The knob assembly also includes: A rotating connector, a portion of which is disposed on the inner circumferential side of the knob housing and connected to the knob housing; A bracket is connected to the fixed base on the side away from the display screen, and the rotating connector surrounds the bracket and is rotatable relative to the bracket. An encoder circuit board is disposed on the side of the drive circuit board away from the mounting base and is electrically connected to the drive circuit board; A rotary encoder, electrically connected to the encoder circuit board, the rotary encoder comprising: The retaining ring is connected to the bracket; The rotating ring is connected to the rotating connector, and the rotating ring and the fixed ring are rotatably connected. When the rotating ring rotates relative to the fixed ring, the rotary encoder sends a rotation signal to the encoder circuit board.

8. The rotary display screen according to any one of claims 1 to 7, characterized in that, The display screen also includes: A flexible circuit board, one end of which is electrically connected to the array substrate, and the other end of which is electrically connected to the driving circuit board.

9. The rotary display screen according to any one of claims 1 to 7, characterized in that, The display screen is circular in shape.

10. A household appliance, characterized in that, include: shell; The knob display screen as described in any one of claims 1 to 9, wherein the knob display screen is disposed on the housing.

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