DISPLAY DEVICE

Provided is a display device, which relates to the technical field of electronic devices. The display device includes a fixed structure, a first display screen, an external display screen, and a movable support. The first display screen is disposed on the fixed structure, and the movable support is movably disposed on the fixed structure. The display device has at least a first state and a second state. In the first state, an orthographic projection of the movable support on a plane where the first display screen is located is within a range of the first display screen. In the second state, the orthographic projection of the movable support on the plane where the first display screen is located is at least partially outside the range of the first display screen to support the external display screen configured to be spliced with the first display screen.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese patent application No. 202311745793.5 filed with the CNIPA on Dec. 18, 2023, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the technical field of electronic devices and, in particular, to a display device.

BACKGROUND

In recent years, smart wearable products have developed rapidly. The smart wearable products include, for example, a smart watch. The smart watch is easy to carry and convenient to use and has a good application prospect. However, the current smart watch has a relatively small screen and has a relatively single function compared to common large-screen smart devices. The current smart watch has a single industrial design (ID) and a relatively single usage scenario, affecting user experience.

SUMMARY

Based on the preceding problems, the present disclosure aims to provide a display device, which has not only conventional display functions but also extended display functions and thus meets the needs of a user in diversified usage scenarios.

To achieve the preceding object, the present disclosure adopts the technical solutions below.

A display device includes a fixed structure, a first display screen disposed on the fixed structure, an external display screen, and a movable support movably disposed on the fixed structure.

The display device has at least a first state and a second state. In the first state, the orthographic projection of the movable support on the plane in which the first display screen is located is within the range of the first display screen. In the second state, the orthographic projection of the movable support on the plane where the first display screen is located is at least partially outside the range of the first display screen so that the movable support supports the external display screen configured to be spliced with the first display screen.

REFERENCE LIST

DETAILED DESCRIPTION

To make solved technical problems, adopted technical solutions, and achieved technical effects of the present disclosure clearer, the technical solutions in embodiments of the present disclosure are further described in detail below in conjunction with the drawings. Apparently, the embodiments described below are part, not all, of the embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art on the premise that no creative work is done are within the scope of the present disclosure.

In the description of the present disclosure, it is to be noted that orientations or position relations indicated by terms such as “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “in”, and “out” are based on the drawings. These orientations or position relations are intended only to facilitate and simplify the description of the present disclosure and not to indicate or imply that a device or element referred to must have such particular orientations or must be configured or operated in such particular orientations. Thus, these orientations or position relations are not to be construed as limiting the present disclosure. Moreover, terms such as “first” and “second” are used only for the purpose of description and are not to be construed as indicating or implying relative importance. Terms “first position” and “second position” indicate two different positions.

In the description of the present disclosure, it is to be noted that terms “mounted”, “joined”, and “connected” are to be understood in a broad sense unless otherwise expressly specified and limited. For example, the term “connected” may refer to “securely connected” or “detachably connected”, may refer to “mechanically connected” or “electrically connected”, or may refer to “connected directly”, “connected indirectly through an intermediary”, or “connected inside two components”. For those of ordinary skill in the art, specific meanings of the preceding terms in the present disclosure may be understood based on specific situations.

As shown inFIGS.1to31, the embodiment provides a display device, which may be a wearable device such as a sports bracelet. The display device includes a fixed structure1, a first display screen2, an external display screen3, and a movable support4. The first display screen2is disposed on the fixed structure1, and the movable support4is movably disposed on the fixed structure1. The fixed structure1may be understood as a housing-like structure of the display device, such as a body part11and a strap part of the sports bracelet. The first display screen2may be used as a main display screen of the display device to implement display functions of conventional applications, for example, display information of the sports bracelet such as time, a heart rate, and an incoming call reminder. The external display screen3may be used as a secondary display screen of the display device to implement extended display functions together with the main display screen, for example, a circular watch, a large audiovisual screen, foldable screen photographing, and other functions added on the basis of the sports bracelet. The display device has at least a first state and a second state. In the first state, an orthographic projection of the movable support4on a plane where the first display screen2is located is within a range of the first display screen2. In the second state, the orthographic projection of the movable support4on the plane where the first display screen2is located is at least partially outside the range of the first display screen2so that the movable support4supports the external display screen3configured to be spliced with the first display screen2. It is to be understood that the main difference between the first state and the second state of the display device is that in the first state, the display device can implement conventional display functions, and in the second state, the display device can implement extended display functions.

Since the movable support4is movably disposed on the fixed structure1, in the first state, the orthographic projection of the movable support4on the plane where the first display screen2is located is within the range of the first display screen2so that the movable support4can be hidden under the first display screen2and does not affect the conventional display functions of the display device, such as conventional display functions of the sports bracelet. In the second state, the orthographic projection of the movable support4on the plane where the first display screen2is located is at least partially outside the range of the first display screen2so that the movable support4supports the external display screen3configured to be spliced with the first display screen2. The extended display functions of the display device are implemented through the external display screen3, for example, the extended display functions such as a circular business watch, a rectangular audiovisual screen, and a foldable screen are added on the basis of the sports bracelet, thereby meeting needs of a user in different scenarios, improving user experience, and providing a new product easily recognizable and applicable to a wide range of users and rich scenarios.

Existing wearable devices cannot meet application needs in different scenarios, for example, the sports bracelet has a single appearance, is applicable to a sports scenario, and does not appear formal enough in a formal business activity. To solve this problem, in some embodiments, as shown inFIGS.3to6, the movable support4may include a first support plate41and a second support plate42, and the external display screen3includes a first external screen31and a second external screen32, where the first support plate41and the second support plate42are movably disposed on the fixed structure1separately, the first support plate41is movable to a first support position to support the first external screen31, the second support plate42is movable to a second support position to support the second external screen32, and the first display screen2, the first external screen31, and the second external screen32may be spliced into a first spliced screen. A structural form of the first support plate41and the second support plate42is adopted so that the structural design of the movable support4is simplified, thus reducing the manufacturing cost of the entire display device. Both the first support plate41and the second support plate42adopt a plate-like structure, which can reduce an occupied space and improve the wearing comfort of the user. Both the first support plate41and the second support plate42may be rotatably disposed on the fixed structure1. For example, the first support plate41and the second support plate42are rotatably connected to the fixed structure1through their respective spindles, or the first support plate41and the second support plate42share the same spindle6(as shown inFIGS.16and17). The first support plate41and the second support plate42may separately rotate by 90° from an initial position to a target position and then support the first external screen31and the second external screen32respectively. The first spliced screen may be a display screen in the shape of a circular dial and thus appears formal and classic in some formal business cooperation occasions. It is to be noted that the initial position refers to a position at which the first support plate41and the second support plate42are completely hidden under the body part11. In the rotation process of the first support plate41and the second support plate42, the first support plate41and the second support plate42are gradually exposed outside the body part11. The target position refers to a position at which the first support plate41and the second support plate42are exposed outside the body part11to the maximum. With this setting, in the first state, the display device can have convenient and dynamic attributes of the sports bracelet, and in the second state, the display device can be deformed and sliced into a traditional classic circular watch with business attributes, thus meeting the needs of the user in different scenarios and improving the user experience.

To prevent interference between the first support plate41and the second support plate42, in an embodiment, the first support plate41and the second support plate42are rotatably disposed on the fixed structure1separately. As shown inFIGS.5and6, the first support plate41is provided with a first avoidance surface411, the second support plate42is provided with a second avoidance surface421, and an avoidance gap is formed between the first avoidance surface411and the second avoidance surface421. In the first state, the included angle between the first avoidance surface411and the second avoidance surface421is greater than or equal to 90°. When one of the first support plate41and the second support plate42rotates and the other does not rotate, the design of the avoidance gap can effectively avoid the interference between the first support plate41and the second support plate42. Since the included angle between the first avoidance surface411and the second avoidance surface421is greater than or equal to 90°, even if the first support plate41and the second support plate42rotate by 90° from the initial position to the target position, there is still avoidance room between the first support plate41and the second support plate42. To prevent the user from being scratched, outer edges of the first support plate41and the second support plate42may be arc-shaped.

Existing sports bracelets have narrow screens which are not suitable for playing movies and television shows due to their dimensions and ratios and thus cannot provide timely entertainment and have a single function and application scenario. To solve this problem, in some embodiments, as shown inFIGS.7to10, the movable support4may include the first support plate41, where the first support plate41is movably disposed on the fixed structure1, the first support plate41is movable to a third support position to support the external display screen3, and the first display screen2and the external display screen3may be spliced into a second spliced screen. A structural form of the first support plate41is adopted so that the structural design of the movable support4is simplified, thus reducing the manufacturing cost of the entire display device. The first support plate41adopts a plate-like structure, which can reduce the occupied space and improve the wearing comfort of the user. The first support plate41is rotatably disposed on the fixed structure1, for example, rotatably connected to the fixed structure1through a spindle. The first support plate41may rotate by 90° from the initial position to the target position and then support the external display screen3. Since the first display screen2and the external display screen3are spliced into the second spliced screen, the display area can be increased and more display requirements of the user can be met. For example, movie watching has a relatively high requirement on the display area, and general sports bracelets cannot meet this requirement. The second spliced screen may be a square screen or a rectangular screen, which is determined according to the requirement of the user. It is to be understood that the movable support4may include only the first support plate41, which is sufficient to support the external display screen3, or the movable support4may include both the first support plate41and the second support plate42, where the first support plate41supports the external display screen3, and the second support plate42may be idle or spare.

As shown inFIG.10, to further increase the display area of the display device, in an embodiment, the fixed structure1includes the body part11, a first flexible part12, and a second flexible part13, where an end of the first flexible part12and an end of the second flexible part13are each connected to the body part11, the other end of the first flexible part12and the other end of the second flexible part13are detachably connected, the first flexible part12is provided with a first flexible screen, the second flexible part13is provided with a second flexible screen, and the first display screen2, the first flexible screen, the second flexible screen, and the external display screen3may be spliced into a third spliced screen. The body part11is configured to support the first display screen2, and the first flexible part12and the second flexible part13may be configured to fix the display device to a human body for easy carrying. The first flexible part12and the second flexible part13made of flexible materials also enhances the wearing comfort of the user. The setting of the first flexible screen and the second flexible screen can increase the display area of the display device and provide the user with more information display functions. Since the first display screen2, the first flexible screen, the second flexible screen, and the external display screen3are spliced into the third spliced screen, the display area can be increased and more display requirements of the user can be met. For example, movie watching has a relatively high requirement on the display area, and the third spliced screen may be a widescreen with an aspect ratio of 16:9, which can enhance the viewing experience of the user. The setting of the third spliced screen allows the user to enjoy moderate entertainment or watch instructional sports videos during breaks in exercises, facilitating the next steps in the exercise. For ease of understanding, when the display device is the sports bracelet, the body part11is a housing structure of the bracelet, and the first flexible part12and the second flexible part13are the strap structure of the bracelet.

Both the first flexible screen and the second flexible screen may be made of the following flexible materials: polyvinyl alcohol (PVA), polyethylene terephthalate (PET), polyimide (PI), polyethylene naphthalate (PEN), paper, and textile materials. The PI material has the advantages of high temperature resistance, low temperature resistance, chemical resistance, and good electrical properties, making it the most potential material for flexible electronics. In addition to the characteristic of high temperature resistance in the selection of flexible substrates, the light transmittance, surface roughness, and material costs of the flexible substrates are factors to be considered in the selection. Polydimethylsiloxane (PDMS) is also a widely recognized flexible material and has the advantages of easy access, stable chemical properties, transparency, and good thermal stability. In particular, an adhesive region and a non-adhesive region are distinct under ultraviolet light, and this characteristic makes the surface of PDMS easy to adsorb electronic materials. Although PET has a low conversion temperature of about 70° C. to 80° C., PET is cheap, has good light transmittance, and is a highly cost-effective material for transparent conductive films.

The first flexible screen and the second flexible screen are each a flexible display screen. The flexible display screen refers to a flexible organic light-emitting diode (OLED). The OLED is very thin and is able to be mounted on a flexible material such as plastics or a metal foil. The use of plastics instead of glass makes the display screen more durable and lighter. A flexible OLED panel is concave from top to bottom, with a bending radius of up to 700 millimeters. The OLED uses a plastic substrate instead of a common glass substrate. Thin-film encapsulation technology is adopted and a protective film is stuck to the back of the panel so that the panel is bendable and less prone to being broken.

An OLED device is composed of a substrate, a cathode, an anode, a hole injection layer (HIL), an electron injection layer (EIL), a hole transport layer (HTL), an electron transport layer (ETL), an electron blocking layer (EBL), a hole blocking layer (HBL), and an emissive layer (EML). The substrate serves as the foundation for the entire device, and all functional layers need to be deposited on the substrate of the device. Glass is commonly used as the substrate of the device. However, if a bendable flexible OLED device needs to be manufactured, other materials such as plastics need be used as the substrate of the device. The anode is connected to a positive electrode of the device to which a drive voltage is applied, and holes in the anode move towards the emissive layer of the device under the applied drive voltage. The cathode is transparent, allowing the light emitted from the interior of the device to be observed externally. The cathode is made of a MgAg alloy.

The hole injection layer is able to modify the anode of the device and allows the holes from the anode to be smoothly injected into the hole transport layer. The hole transport layer is responsible for transporting holes to the emissive layer. The electron blocking layer blocks electrons from the cathode at an interface of the emissive layer of the device, increasing the concentration of electrons at the interface of the emissive layer of the device. The emissive layer is a layer where electrons and holes of the device recombine into excitons, and the excitons are then de-excited to emit light. The hole blocking layer blocks the holes from the anode at an interface of the emissive layer of the device, thereby increasing the probability of recombination of electrons and holes at the interface of the emissive layer of the device and increasing the luminescence efficiency of the device. The electron transport layer is responsible for transporting the electrons from the cathode to the emissive layer of the device. The electron injection layer acts to modify the cathode and transport electrons to the electron transport layer. Electrons in the cathode move towards the emissive layer of the device under the applied drive voltage of the device and recombine with the holes from the anode in the emissive layer.

Compared to traditional screens, the flexible display screen has significant advantages. The flexible display screen is lighter and thinner in volume and has lower power consumption than original devices, improving the battery life of the device. Meanwhile, due to its bendability and good flexibility, the flexible display screen is much more durable than traditional screens, reducing the probability of accidental damage to the device. A foldable screen is required to remain good after being bent 200,000 times and is a flexible screen with a relatively high requirement on flexibility. The structure of the foldable screen needs to be designed separately.

In order that a screen of an existing sports bracelet worn on the wrist is viewed for a long time, an arm needs to be maintained at a fixed position for a relatively long time, which is tiring. To solve this problem, in some embodiments, as shown inFIGS.11to13, the external display screen3is a foldable screen. The use of the foldable screen can well resolve the problem where the use is prone to fatigue due to the fixed arm position. The angle of the foldable screen may be adjusted, and then the position of the arm is changed, allowing the user to relax the arm freely and improving the user experience. Moreover, the foldable screen has advantages in split-screen applications, enabling the user to perform multi-screen operations in multi-application scenarios.

When the existing sports bracelet is worn on the wrist, the sports bracelet needs to be taken off if photographing or a video call needs to be performed by using a camera at the top of the screen, which is inconvenient to operate. Otherwise, photographing with the sports bracelet worn requires an unnatural and non-ergonomic twisting motion of the arm. To solve this problem, in an embodiment, a front-facing camera5and/or a rear-facing camera are disposed on the foldable screen. The front-facing camera5on the foldable screen is used for the video call, or the rear-facing camera on the foldable screen is used for photographing, which can reduce the movement difficulty of the arm, alleviate the fatigue of the arm, and allow the user to quickly and timely complete the photographing or the video call without taking off the sports bracelet, making the operation convenient and natural. The number of front-facing cameras5and the number of rear-facing cameras may be determined according to requirements of the user, which are not limited here.

As shown inFIGS.11to13, in an embodiment, the foldable screen includes a first screen33and a second screen34arranged at an angle, where the first screen33and the first display screen2are disposed in the same plane. The first screen33is supported by the first support plate41. Since the first screen33and the first display screen2are disposed in the same plane, the combination and splicing of the first screen33and the first display screen2can effectively increase the display area of the display device, providing the user with more convenience in various application scenarios. The second screen34may be unfolded to be in the same plane as the first screen33. At this time, the first screen33, the second screen34, and the first display screen2are all in the same plane, further increasing the display area of the display device.

In an embodiment, the included angle between the folding seam between the first screen33and the second screen34and a side of the first display screen2ranges from 0° to 90°. The first screen33and the second screen34are folded by the folding seam. When the included angle between the folding seam and the side of the first display screen2is 0°, the folding seam is parallel to the side of the first display screen2. When the included angle between the folding seam and the side of the first display screen2is 90°, the folding seam is perpendicular to the side of the first display screen2. This design is applicable to different application scenarios. When the included angle between the folding seam and the side of the first display screen2is between 0° and 90°, such as 30°, 45°, or 60°, the movement difficulty of the arm can be reduced, making it convenient for the user to check information on the screen.

To adapt to external display screens3of different sizes, in an embodiment, when the movable support4moves relative to the fixed structure1, a region of the orthographic projection of the movable support4on the plane where the first display screen2is located outside the range of the first display screen2is a support region, and the support region is adjustable in area. Since the support region is adjustable in area, the external display screen3supported in the support region can have more size options so that costs are properly controlled according to conventional requirements of the user.

In some embodiments, as shown inFIGS.14to17, the movable support4is rotatably disposed on the fixed structure1, where in the first state, the movable support4has a first included angle with an edge of the first display screen2, and in the second state, the movable support4has a second included angle with the edge of the first display screen2, where the first included angle and the second included angle are different. That is to say, the angle between the movable support4and the edge of the first display screen2is adjustable. The angle is adjusted so that the support region is adjustable in area. The angle may be adjusted in various manners. For example, sliding protrusions46mate with arc-shaped grooves16so that the angle between the movable support4and the edge of the first display screen2is adjusted. The sliding protrusions46may be disposed on the movable support4, and the arc-shaped grooves16may be disposed on the fixed structure1. Since the first display screen2remains stationary relative to the fixed structure1, the sliding protrusions46move along an arcuate trajectory by sliding within the arc-shaped grooves16, and thus the rotational angle of the movable support4is adjusted so that the angle between the movable support4and the edge of the first display screen2can be adjusted.

In some embodiments, as shown inFIGS.14,15, and18, when the orthographic projection of the movable support4on the plane where the first display screen2is located is within the range of the first display screen2, the movable support4is locked to the fixed structure1through first locking structures43, and when the orthographic projection of the movable support4on the plane where the first display screen2is located is at least partially outside the range of the first display screen2, the movable support4is locked to the external display screen3through second locking structures37. The first locking structures43and the second locking structures37may be mechanical locking structures, such as mating of lock pins and pinholes. Under the action of the first locking structures43and the second locking structures37, the movable support4can be locked at a current position so that the display device is maintained in the first state or the second state, preventing the movable support4from shaking during the operation of the user and affecting the display effect.

In an embodiment, the first locking structures43and the second locking structures37are magnetic components. The first locking structures43and the second locking structures37use magnetic attraction for locking, achieving high safety, easy installation, and convenient operation. The magnetic components may be mounted on the movable support4and the fixed structure1by an adhesive.

In some embodiments, as shown inFIGS.19to22, the movable support4is movably disposed on the fixed structure1, where in the first state, the movable support4has a first distance from the edge of the first display screen2, and in the second state, the movable support4has a second distance from the edge of the first display screen2, where the first distance and the second distance are different. That is to say, the distance between the movable support4and the edge of the first display screen2is adjustable. The distance is adjusted so that the support region is adjustable in area. The distance may be adjusted in various manners. For example, sliders45mate with linear grooves15so that the distance between the movable support4and the edge of the first display screen2is adjusted. The sliders45may be disposed on the movable support4, and the linear grooves15may be disposed on the fixed structure1. Since the first display screen2remains stationary relative to the fixed structure1, the sliders45slide within the linear grooves15so that the distance between the movable support4and the edge of the first display screen2can be adjusted.

As shown inFIGS.23and24, in an embodiment, one of the movable support4and the fixed structure1is provided with a damping groove14, and the other is provided with a damping protrusion44that mates with the damping groove14. The damping protrusion44and the damping groove14are made of damping materials. When the damping protrusion44slides relative to the damping groove14, the damping protrusion44may stay at any position so that the relative position between the movable support4and the fixed structure1can be adjusted steplessly. It is to be noted that the damping protrusion44and the damping groove14may be structures independent of the sliders45and the linear grooves15or may be integrated with the sliders45and the linear grooves15. For example, the damping protrusion44is disposed on a slider45, and the slider45may be circular, while the damping groove14is disposed on an inner sidewall of a linear groove15and in a wavy pattern. Of course, a damper may be installed between the movable support4and the fixed structure1so that the relative position between the movable support4and the fixed structure1is adjusted steplessly.

The relative position between the movable support4and the fixed structure1may be adjusted step by step and divided into several gears. In an embodiment, at least one damping protrusion44is provided, multiple damping grooves14are provided, and the damping protrusion44is able to mate with any one of the damping grooves14; or at least one damping groove14is provided, multiple damping protrusions44are provided, and the damping groove14is able to mate with any one of the damping protrusions44. In this setting, the damping protrusion44does not always mate with the damping groove14so that movement resistance can be reduced. When the damping protrusion44mates with the damping groove14, the relative position between the movable support4and the fixed structure1is in a preset state. Since one damping protrusion44can mate with any one of the damping grooves14, or one damping groove14can mate with any one of the damping protrusions44, the relative position between the movable support4and the fixed structure1can achieve multi-gear adjustment.

In an embodiment, in the first state, the movable support4is connected to the fixed structure1through a first positioning structure; and in the second state, the movable support4is connected to the external display screen3through a second positioning structure. The first positioning structure and the second positioning structure may be mechanical positioning structures. Under the action of the first positioning structure and the second positioning structure, the user may relatively clearly perceive whether the movable support4moves in position by means of tactile perception. The first positioning structure and the second positioning structure may be sensor positioning structures, and the user may be reminded by a voice or text from a control system of whether the movable support4moves in position. The first positioning structure may be entirely disposed on the movable support4or the fixed structure1, or the first positioning structure may be partly disposed on the movable support4and partly disposed on the fixed structure1. The second positioning structure may be entirely disposed on the movable support4or the fixed structure1, or the second positioning structure may be partly disposed on the movable support4and partly disposed on the fixed structure1.

In some embodiments, as shown inFIGS.25to27, the movable support4is provided with a first positioning groove47, and the fixed structure1is provided with a first positioning protrusion17; where in the first state, the first positioning protrusion17may be snapped into the first positioning groove47, and the first positioning protrusion17and the first positioning groove47form the first positioning structure; and the external display screen3is provided with a second positioning protrusion35, where in the second state, the second positioning protrusion35can be snapped into the first positioning groove47, and the second positioning protrusion35and the first positioning groove47form the second positioning structure. The first positioning structure and the second positioning structure share the same first positioning groove47, which can reduce the manufacturing cost and properly use a limited installation space.

In some embodiments, as shown inFIGS.28to31, the movable support4is provided with a third positioning protrusion48, and the fixed structure1is provided with second positioning groove18, where in the first state, the third positioning protrusion48may be snapped into the second positioning groove18, and the third positioning protrusion48and the second positioning groove18form the first positioning structure; and the external display screen3is provided with a third positioning groove36, where in the second state, the third positioning protrusion48may be snapped into the third positioning groove36, and the third positioning protrusion48and the third positioning groove36form the second positioning structure. The first positioning structure and the second positioning structure share the same third positioning protrusion48, which can reduce the manufacturing cost and properly use the limited installation space.

As shown inFIGS.29and31, in an embodiment, the movable support4is provided

with a first connector49, and the external display screen3is provided with a second connector38, where in the second state, the second connector38may be electrically connected to the first connector49. When the movable support4moves relative to the fixed structure1until the display device is in the second state, the first connector49can be just exposed and is convenient for an electrical connection with the second connector38of the external display screen3. When the movable support4moves relative to the fixed structure1until the display device is in the first state, the first connector49is hidden under the fixed structure1, preventing impurities from falling into the first connector49.

Since the movement of the movable support4relative to the fixed structure1may affect signal transmission of a sensor of the display device, in an embodiment, the movable support4is provided with a sensor avoidance opening410. The sensor of the display device may be a heart rate sensor or a step counting sensor, which is not limited here.

After the external display screen3is spliced with the first display screen2in structure, display images need to be spliced or displayed independently. In an embodiment, the display device also includes a control mainboard disposed on the fixed structure1, where the first display screen2and the external display screen3are connected to the control mainboard, and the control mainboard is configured to receive and process a signal to be displayed and transmit the signal to be displayed to the first display screen2and the external display screen3.

The movable support4may move automatically relative to the fixed structure1through a driver. The driver may use a servo motor. The servo motor is able to control a speed, has very high position accuracy, and is able to convert voltage signals into torque and rotational speeds to drive a controlled object. Since the servo motor has a relatively high rotational speed, the servo motor may be connected to the movable support4through a reduction gearbox, thereby ensuring the smooth operation of the movable support4, high transmission accuracy, high transmission efficiency, and an accurate gear ratio. Of course, the servo motor may be connected to the movable support4through a rack and pinion transmission structure, which is simple in structure, occupies a small space, ensures accurate and reliable transmission, and avoids accumulation of transmission errors. The specific situation needs to be determined according to a corresponding application scenario.

As an example rather than a limitation, when the preceding display device is the wearable device, the wearable device may be a general term for wearable devices developed through an intelligent design of daily wear by using wearable technology, such as gloves and watches equipped with near-field communication modules. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessory of the user and that is attached to the user to perform operations such as payment and authentication through a pre-bound electronic card. The wearable device is more than a hardware device and can implement powerful functionality through software support, data interaction, and cloud interaction. The smart wearable device in a general sense includes full-featured and large-sized devices that can implement complete or partial functions without relying on smartphones, such as a smart watch or smart glasses, and devices that only focus on a certain type of application function and need to be used in combination with another device such as a smartphone, such as various types of smart watches or smart bracelets with display screens.

In terms of hardware, the wearable device has a central processor, a memory, an input component, and an output component, that is to say, the wearable device is often a microcomputer device with communication functions. Additionally, the wearable device may have multiple input manners, such as a keyboard, a mouse, a touch screen, a microphone, and a camera, and the input may be adjusted as needed. Meanwhile, the wearable device often has multiple output manners, such as a telephone receiver and a display screen, which may also be adjusted as needed.

In terms of software, the wearable device must have an operating system, such as Windows Mobile, Symbian, Palm, Android, and iOS. Moreover, these operating systems are increasingly open, and personalized application software developed based on the open operating system platforms is emerging, such as an address book, a schedule, a notebook, a calculator, and various games, which greatly satisfy the personalized needs of users.

In terms of communication capability, the wearable device has flexible access manners and high-bandwidth communication performance, and the selected communication manner can be automatically adjusted according to a selected service and an environment, which facilitates use by the user. The wearable device can support Global System for Mobile Communications (GSM), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access 2000 (CDMA2000), Time Division-Synchronous Code Division Multiple Access (TDSCDMA), wireless fidelity (Wi-Fi), and World Interoperability for Microwave Access (WiMAX) and thus adapts to various types of networks. The wearable device supports not only voice services but also various wireless data services.

In terms of functional use, the wearable device pays more attention to humanization, individualization, and multi-function. With the advancement of computer technology, the wearable device has shifted from a “device-centric” model to a “user-centric” model and has been integrated with embedded computing, control technology, artificial intelligence technology, and biometric authentication technology, fully embodying a user-centric philosophy. Due to the development of software technology, the wearable device may be customized based on individual requirements and become more individualized. Moreover, the wearable device is integrated with numerous software and hardware and has increasingly powerful functionality.

It is to be noted that the preceding are only preferred embodiments of the present disclosure and technical principles used therein. It is to be understood by those skilled in the art that the present disclosure is not limited to the particular embodiments described herein. Those skilled in the art can make various apparent modifications, adaptations, and substitutions without departing from the scope of the present disclosure. Therefore, while the present disclosure has been described in detail through the preceding embodiments, the present disclosure is not limited to the preceding embodiments and may include more other equivalent embodiments without departing from the concept of the present disclosure. The scope of the present disclosure is determined by the scope of the appended claims.