Anti-shake micro-display module and intelligent wearable device

Abstract

The utility model discloses an anti-shake micro-display module and an intelligent wearable device. The anti-shake micro-display module comprises an FPC circuit board which is processed into an inner movable part, an outer fixed part located on the periphery of the inner movable part, and an elastic piece which is connected with the inner movable part and the outer fixed part and has reciprocating force in the front, back, left and right directions in the plane where the FPC circuit board is located; the micro display screen is fixed on the inner movable part; the center of the mounting cover is provided with a through hole of which the area is greater than or equal to that of a display picture of the micro-display screen; and at least two groups of magnet coil pairs are orthogonally distributed, are arranged on the opposite surfaces of the inner movable part around the micro display screen and the mounting cover, and are used for driving the inner movable part to drive the micro display screen to move in the plane where the FPC circuit board is located. The micro display screen is compact in structure and small in size, and the anti-shake function of the micro display screen can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of micro display module, especially to a kind of anti-shake micro display module and the intelligent wearable equipment applied to the anti-shake micro display module. BACKGROUND

[0002] With the rapid development of virtual reality (VR), augmented reality (AR) and intelligent wearable devices, as the core optical component, the technology iteration and performance improvement of micro display screen have become the focus of the industry.Current mainstream VR / AR glasses adopt the optical architecture of "micro display screen + lens group", which generates images through micro display screen, and then enlarges and projects the images to the retina of human eye through optical lens.However, in dynamic use scenarios (such as walking, exercise), physical shaking of the device caused by human motion or external environmental interference will cause relative displacement of the micro display screen and the optical system, and further cause image blur, delay and visual dizziness.

[0003] The prior art with publication number CN117572647B provides a micro display to solve the problem of micro display shaking, which is provided with position driving units around the micro display, the position driving units are connected with the micro display through springs, and then the shaking of the micro display is detected through an acceleration sensor, and the corresponding position driving units are driven to prevent shaking.

[0004] Although the prior art can achieve anti-shaking to some extent, since power components are needed to be installed on four sides to push, it will cause the volume of the entire micro display module to be large, which is difficult to meet the needs of current miniaturized devices, for example, applying the technology to intelligent wearable devices will cause the volume of the intelligent wearable devices to be large and the weight to be heavy.

[0005] Therefore, how to provide a miniaturized micro display module is a technical problem to be solved. UTILITY MODEL CONTENT

[0006] The utility model discloses a kind of anti-shake micro display module, intelligent wearable equipment to solve the technical problem that the specific implementation structure of micro display anti-shaking technology in prior art is large in volume, heavy in weight.

[0007] The anti-shake micro display module provided by the utility model includes:

[0008] FPC circuit board is processed into inner movable part, outer fixed part located in the outer periphery of inner movable part, and elastic member with reciprocating force in each direction of front, back, left and right in the plane where FPC circuit board is located, connecting inner movable part and outer fixed part;

[0009] Micro display screen, fixed on the inner movable part;

[0010] a mounting cover, the center of which is provided with a through hole having an area greater than or equal to that of the display screen of the micro display screen;

[0011] a magnet coil pair, including at least two groups in orthogonal distribution, the magnet coil pair being arranged on opposite surfaces of the inner movable part and the mounting cover around the micro display screen, for driving the inner movable part to move the micro display screen in the plane of the FPC circuit board.

[0012] Further, a base is further included, which cooperates with the mounting cover to fix the outer fixed part of the FPC circuit board, and encapsulates the micro display screen and the magnet coil pair in an inner shell formed by the base and the mounting cover.

[0013] Further, an optical element group is further included, which is fixed at a certain distance in front of the micro display screen, and includes at least one optical element.

[0014] Further, an outer fixing member for fixing the optical element group is further included, the outer fixing member being provided with a groove or a mounting hole for clamping the base, so that the part of the FPC circuit board located outside the base is supported by the bottom surface of the outer fixing member, and is located in the same horizontal plane as the part of the FPC circuit board located on the base.

[0015] Further, the mounting cover is in the shape of a two-stage boss, the bottom of the lower-stage boss of the mounting cover is connected with the outer fixed part of the FPC circuit board, and the magnets or coils in the magnet coil pair are fixed on the inner side surface of the upper-stage boss of the mounting cover.

[0016] Further, the FPC circuit board is of a multi-layer structure, one layer of which is a metal layer, and the elastic member is formed by removing other layers through a processing technology while retaining the metal layer.

[0017] Further, the coils in the magnet coil pair are all mounted on the inner movable part, each magnet is arranged in one-to-one correspondence with each coil on the mounting cover, and the two parts of the coil wire in opposite directions correspond to different polarities.

[0018] Further, the magnet coil pair has four groups, the four coils of the four groups of magnet coil pairs are arranged at positions close to a corner on one side of the micro display screen, and the two coils located on the opposite two sides of the micro display screen are arranged in central symmetry based on the center of the micro display screen.

[0019] Further, the optical element group includes a mirror for reflecting the screen of the micro display screen at a corresponding angle, and / or the optical element group includes at least one lens, and the optical axis of the lens of the optical element group passes through the center of the micro display screen.

[0020] Further, an external or internal controller is further included, and a plurality of Hall sensors are arranged on the inner moving part of the FPC circuit board to sense magnetic field changes in different directions.

[0021] The intelligent wearable device adopts the anti-shake micro display module of the technical scheme.

[0022] The micro display screen is arranged on the mover of the FPC circuit board, the micro display screen is driven by the magnet coil pair to prevent shaking, the structure is compact, miniaturization can be realized, various intelligent devices can be adapted, the adaptability is high, various lens combinations can be matched, the structure is simple, mass production is suitable, and the intelligent wearable device is especially suitable for application in the currently popular VR / AR glasses, has a crucial influence on the intelligent glasses, the intelligent wearable device industry and the micro display screen related industry. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be combined with embodiment and drawing carries out detailed explanation, wherein:

[0024] Figure 1 It is a three-dimensional schematic view of an embodiment of the utility model.

[0025] Figure 2 It is Figure 1 The explosion map.

[0026] Figure 3 It is a partial sectional view of the anti-shake structure of the micro display of an embodiment of the utility model.

[0027] Figure 4 It is a magnetic circuit principle diagram of the anti-shake structure of the micro display of an embodiment of the utility model.

[0028] Figure 5 It is a principle schematic view of an application embodiment of the utility model.

[0029] Figure 6 It is a principle schematic view of another application embodiment of the utility model.

[0030] BRIEF DESCRIPTION OF DRAWINGS:

[0031] 1, installation cover, 2, coil, 3, magnet, 4, micro display screen, 5, FPC circuit board, 6, base, 7, optical element group, 8, outer fixed frame, 9, human eye, 10, optical axis, 11, mover part 11, 12, bent arm, 13, stator. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples.

[0033] Therefore, one feature indicated in the specification will be used to explain one feature of one embodiment of the utility model, and it is not implied that each embodiment of the utility model must have the explained feature. In addition, it should be noted that the specification describes many features. Although certain features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly explained. Therefore, unless otherwise stated, the explained combinations are not intended to be limiting.

[0034] In one basic embodiment, the anti-shake micro display module of the utility model comprises an FPC circuit board, a micro display screen, a mounting cover and a magnet coil pair.

[0035] The FPC circuit board comprises three parts, namely an inner movable part, an elastic member and an outer fixed part, which are located in the same plane and are obtained by processing the FPC circuit board and are part of the FPC circuit board. The utility model does not limit the specific shape of the inner movable part, the elastic member and the outer fixed part, wherein the inner movable part is inside the outer fixed part, the outer fixed part is outside the inner movable part, the inner movable part and the outer fixed part are connected through a plurality of elastic members, and the elastic members have reciprocating force in each direction of front, back, left and right in the plane of the FPC circuit board.

[0036] The micro display screen is fixed on the inner movable part, and the mounting cover is arranged above the micro display screen. The center of the mounting cover is provided with a through hole larger than or equal to the display picture of the micro display.

[0037] The magnet coil pair is arranged around the micro display screen and comprises at least two groups in orthogonal distribution, which respectively control the operation of the micro display screen in the x-axis or y-axis direction. The resultant force of the magnet coil pairs in the orthogonal direction can realize the translational motion of the micro display screen in other directions. All the magnet coil pairs are specifically arranged on the opposite surfaces of the inner movable part of the FPC circuit board and the mounting cover. By passing corresponding size and direction of current through the coils in the magnet coil pair, the inner movable part and the micro display screen are driven to move in the plane of the FPC circuit board under the action of corresponding magnetic lines, so as to realize anti-shake.

[0038] The above FPC circuit board can be used for jointly forming a micro display with the micro display screen, or can be an additional FPC circuit board based on the existing circuit board of the micro display, and the FPC circuit board can receive signals from the outside, so that the micro display screen plays corresponding pictures, and the FPC circuit board and the magnet coil pair are used to realize anti-shake control of the micro display screen, the control technology of the mature voice coil motor can be used, and the anti-shake structure of the micro display screen has the advantages of fewer components, smaller size and more compact structure.

[0039] In a further embodiment, the utility model also includes a base, the base cooperates with the mounting cover to fix the outer fixed part of FPC circuit board, and the micro display screen and magnet coil pair are encapsulated in the inner shell formed by the base and the mounting cover.

[0040] Specifically, the base can be provided with mounting protrusions, so that the elastic member and the inner movable member of the FPC circuit board are in a suspended state relative to the base, the outer fixed part of the FPC circuit board is provided with fixed holes corresponding to the mounting protrusions one by one, and the FPC circuit board can be fixed at the corresponding position of the frame-shaped base through the fixed holes and the mounting protrusions, thereby enhancing the rigidity of the outer fixed part. Through cooperation of the frame-shaped base and the mounting cover with the corresponding size, the anti-shake micro display part can be made into a module to be matched with any smart device. In addition to this fixing mode, other fixing modes such as adhesive fixing or screw fixing can also be adopted.

[0041] In an embodiment, the utility model also includes an optical element group, the optical element group is fixed at a certain distance in front of the micro display, and the optical element group includes at least one optical element.

[0042] The above micro display is made into a module, and is matched with a corresponding optical element group to realize picture projection required by various devices. The utility model does not limit whether the optical element group is the optical element group of the smart device or the optical element group provided by the micro display module, and can be one of the two or both.

[0043] In an embodiment, an outer fixing member is further included, and the outer fixing member is used to fix the optical element group. The outer fixing member is provided with a groove or a mounting hole for clamping the frame-shaped base, so that the part of the FPC circuit board located outside the frame-shaped base is supported by the bottom surface of the outer fixing member and is located at the same horizontal plane as the part of the FPC circuit board located on the frame-shaped base, that is, the FPC circuit board can not be bent and is kept in a plane state all the time, thereby reducing the risk of fracture or open circuit of the circuit caused by bending.

[0044] In other embodiments, the frame-shaped base can also be omitted, and only the outer fixing member is provided, and mounting protrusions can be arranged around the grooves or mounting holes of the outer fixing member, so that the FPC circuit board is directly fixed on the outer fixing member to form a module with the optical element group. In addition, the optical element group can be mounted on the mounting cover in addition to being mounted on the outer fixing member, and the side of the mounting cover away from the micro display screen can be provided with corresponding structures to mount the optical element group, so as to simplify the structure of the outer fixing member.

[0045] Figure 1 A perspective view of a preferred embodiment of the utility model is shown, in which the outer fixing member is made into a bracket shape, specifically composed of two intersecting U-shaped members, the bottom of the outer fixing member is used to fix the micro display part which has been packaged, and the top of the outer fixing member is used to fix the optical element group 7. The micro display part is fixed as a whole at the center position of the outer fixing frame 8, and the optical axis 10 of the lens of the optical element group 7 passes through the center of the micro display screen 4.

[0046] As shown in Figure 2 , 3 In a specific embodiment, the mounting cover 1 is in the shape of a two-stage boss, the bottom of the lower-stage boss of the mounting cover 1 is connected with the outer fixing part of the FPC circuit board 5, and the magnet 3 or the coil 2 in the pair of magnets 3 and coils 2 is fixed on the inner side surface of the upper-stage boss of the mounting cover 1, and the mounting cover 1 and the frame-shaped base 6 package the FPC circuit board 5 and the components thereon to form a modular structure.

[0047] The FPC circuit board 5 in each of the above embodiments is of a multilayer structure, one layer of which is a metal layer, which can be an alloy copper material or other conductive structure, so that the FPC circuit board 5 can have the characteristics of a metal spring, that is, has resilience and restoring force.

[0048] The inner movable part in the specific embodiment is square-shaped, the outer fixing part is frame-shaped, and the elastic member is of a 4-bend-arm 12 structure, but in other embodiments, the elastic member can also be of 8 or other numbers, which is determined according to the direction of control movement and the movable stability of the inner movable part, and the inner movable part and the outer fixing part can be prepared into other shapes as needed. The inner movable part and the outer fixing part are connected through the four bend arms 12 structures, so that the inner movable part of the FPC circuit board 5 can move relative to the outer fixing part, that is, the inner movable part is a mover, and the outer fixing part is a stator 13, and the flexible structure connection and electrical connection of the mover and the stator 13 are realized through the four bend arms 12 structures.

[0049] The elastic member is formed by removing other layers and retaining the metal layer at the corresponding position through a processing technology, which includes but is not limited to etching, laser processing, etc. The metal layer in the circuit board is processed to form the elastic member, which is more reliable in structure, and the structure of the FPC circuit board 5 in each embodiment can be obtained through the simplest method.

[0050] As Figure 2 , Figure 3 shown in one embodiment, the coil 2 of the magnet 3 coil 2 pair is mounted on the inner movable part, each magnet 3 is arranged opposite to each coil 2 on the mounting cover 1, and the two parts of the coil 2 winding in opposite directions correspond to different polarities. Taking the coil 2 wound in a clockwise direction as an example, the wire direction of the coil 2 from 0 to 6 o'clock is downward, and the wire direction of the coil 2 from 6 o'clock to 12 o'clock (0 o'clock) is upward, so the two parts correspond to different polarities, that is, fall within the range of magnetic lines of different directions, see Figure 4 shown. The coil 2 can be formed by processing the circuit board, and then mounted on the FPC circuit board 5 of the utility model, or the corresponding coil 2 can be directly formed on the FPC circuit board 5 by directly processing the FPC circuit board 5 of the utility model, which can make the structure more compact. The coil 2 is finally electrically connected to the outside through the FPC circuit board 5.

[0051] In other embodiments, the positions of the coil 2 and the magnet 3 can be interchanged.

[0052] In a more specific embodiment, the magnet 3 coil 2 pair has four groups, the micro display is mounted at the center of the inner movable part of the FPC circuit board 5, the four coils 2 of the four magnet 3 coil 2 pairs are arranged at the position close to one corner on one side of the micro display, and the two coils 2 on the opposite sides of the micro display are arranged in central symmetry based on the center of the micro display screen 4. In the embodiment in the figure, the central symmetry is realized by rotating 180° around the center of the micro display screen 4.

[0053] By controlling the energization of the four coils 2, the magnetic field force is formed with the corresponding four magnets 3, thereby driving the inner movable part of the FPC circuit board 5 to move, that is, driving the micro display screen 4 to move.

[0054] The magnetic circuit schematic diagram is shown in Figure 4 The right side of a single magnet 3 is N level, and the left side is S level. The magnetic induction line is represented by a dashed line, starting from N level and ending at S level. The current direction of a single coil 2 section is from the right side to the left side. According to the left-hand rule, it can be judged that the energized coil 2 will be subjected to a left force F1. Another coil in the section is also subjected to a left force F2 when the same direction current is passed, so that the whole micro display screen 4 will be subjected to a left force F1+F2. The driving principle of the other two groups of coils and magnets perpendicular to the direction is the same.

[0055] The four groups of coil magnets are not arranged around the central axis of the micro display screen in a symmetrical manner, but are arranged at positions close to a corner of the four side edges of the micro display screen 4 in sequence, so that the direction and size of the current of the four coils are controlled by an algorithm respectively, and different directions and sizes of the resultant force can be obtained, so that the micro display screen 4 can move arbitrarily in a plane parallel to the stator.

[0056] In further embodiments based on the above-mentioned embodiments, the utility model also includes an external or internal controller and a plurality of Hall sensors. The external controller can be a controller of a specific device, and the internal controller can be a controller specially configured for the micro display module. The Hall sensors are arranged on the inner movable part of the FPC circuit board, and each Hall sensor is used to sense the magnetic field change in different directions. The external or internal controller controls the current size and direction of the coil at the corresponding position based on the signal transmitted by the Hall sensor, so as to realize accurate anti-shake function. The Hall sensor can real-time feedback the position jitter condition of the micro display screen 4 (for example, the signal of position change, the direction of change, and the change amount), and the external or internal controller drives the micro display screen 4 to move in the opposite direction of the jitter direction by passing the coil with a current of corresponding size and direction through the existing algorithm, so as to realize position compensation and ensure that the center of the micro display screen is coaxial with the optical center of the lens of the optical element group to the center of the eyeball of a person in real time. Only in this way, a clear and stable image can be finally projected to the human eye through the optical element group, so as to realize real-time anti-shake of the display screen of the VR / AR glasses.

[0057] As shown in FIG. 1, Figure 5 In one embodiment, the stator 13 is fixed, the bending arm 12 can drive the mover to move, and the optical element group 7 includes a mirror that reflects the picture of the micro display screen 4 of the mover at a corresponding angle.

[0058] As shown in FIG. 1, Figure 6 In one embodiment, the stator 13 is fixed, the bending arm 12 can drive the mover to move, and the optical element group 7 includes at least one lens, Figure 6 The display is a schematic diagram of the application of the free-form surface lens group.

[0059] In other embodiments, the optical element group 7 can contain both mirrors and lenses. Those skilled in the art can select the optical elements in the optical element group 7 according to the needs.

[0060] Figure 5 、 Figure 6In the application scenario shown, when the person is moving, the smart wearable device shakes, causing the optical axis 10 to deviate from the center of the human eye 9 to form an alpha angle, the optical axis 10 cannot reach the center of the human eye 9 and shakes back and forth, causing the image seen by the human eye 9 to be blurred, the micro display screen 4 is moved in the opposite direction by the anti-shake algorithm, the alpha angle caused by the shaking is compensated, the optical axis 10 always falls on the center of the human eye 9, and the human eye 9 sees a clear and stable image.

[0061] The smart wearable device of the utility model adopts the anti-shake micro display module of each embodiment or the combination of the embodiments.

[0062] The smart wearable device of the utility model includes but is not limited to smart VR, AR glasses, and also includes other smart wearable devices that need to map the picture of the micro display to the human eye.

[0063] The utility model realizes the real-time anti-shake of the micro display screen, is modular, can be matched with different lens groups, prisms and the like, is installed on different smart wearable devices, and is applied to different scenes.

[0064] In the description of the utility model, it is understood that the orientation words such as '' front, back, up, down, left, right '', '' horizontal, vertical, perpendicular, horizontal '' and '' top, bottom '' and the like indicate the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and under the circumstances where no opposite description is made, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the protection scope of the utility model. The orientation words '' inside and outside '' refer to the inside and outside of the contour of each component itself.

[0065] In order to facilitate the description, spatial relative terms such as '' above '', '' above '', '' upper surface '', '' upper '' and the like can be used to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as '' above '' or '' above '' other devices or structures will be positioned '' below '' or '' below '' other devices or structures. Thus, the example term '' above '' can include both '' above '' and '' below '' orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0066] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A shake-reducing microdisplay module, comprising: The application relates to a micro-display module. The FPC circuit board is processed into an inner movable part, an outer fixed part located at the periphery of the inner movable part, and elastic members connecting the inner movable part and the outer fixed part and having reciprocating force in each direction of front, back, left and right in the plane of the FPC circuit board; A micro-display screen is fixed on the inner movable part; A mounting cover is provided with a through hole in the center, and the area of the through hole is greater than or equal to the display picture of the micro-display screen; A magnetic coil pair is arranged on the opposite surfaces of the inner movable part and the mounting cover around the micro-display screen, and is used for driving the inner movable part to move the micro-display screen in the plane of the FPC circuit board.

2. The anti-shake micro display module of claim 1, wherein, The application further comprises: A base is matched with the mounting cover to fix the outer fixed part of the FPC circuit board, and the micro-display screen and the magnetic coil pair are encapsulated in the inner shell formed by the base and the mounting cover.

3. The anti-shake micro display module of claim 2, wherein, The application further comprises: An optical element group is fixed at a certain distance in front of the micro-display screen, and comprises at least one optical element.

4. The anti-shake micro-display module of claim 3, wherein, The application further comprises: An outer fixing member is used for fixing the optical element group, and the outer fixing member is provided with a recess or a mounting hole for clamping the base, so that the part of the FPC circuit board located outside the base is supported by the bottom surface of the outer fixing member and is located in the same horizontal plane as the part of the FPC circuit board located on the base.

5. The anti-shake micro-display module according to any one of claims 1 to 4, characterized in that, The FPC circuit board is a multilayer structure, one layer of which is a metal layer, and the elastic members are formed by removing other layers through a processing technology and retaining the metal layer.

6. The anti-shake micro-display module according to any one of claims 1 to 4, wherein, The coils of the magnetic coil pair are mounted on the inner movable part, and the magnets are respectively arranged opposite to the coils on the mounting cover, and the two parts of the coils with opposite wire directions correspond to different polarities.

7. The anti-shake microdisplay module of claim 6, wherein the anti-shake microdisplay module is configured to: The magnetic coil pair has four groups, and the four coils of the four groups of magnetic coil pairs are arranged at positions close to corners on one side of the micro-display screen, and the two coils located on the opposite sides of the micro-display screen are arranged in central symmetry based on the center of the micro-display screen.

8. The anti-shake micro-display module according to any one of claims 3 or 4, wherein, The optical element group comprises a mirror for reflecting the picture of the micro-display screen at a corresponding angle, and / or the optical element group comprises at least one lens, and the optical axis of the lens of the optical element group passes through the center of the micro-display screen.

9. The anti-shake micro-display module according to any one of claims 1 to 4, wherein, An external or internal controller is further provided, and a plurality of Hall sensors are arranged on the inner movable part of the FPC circuit board and used for sensing the magnetic field changes in different directions, and the external or internal controller controls the current size and direction of the coils at the corresponding positions based on the signals transmitted by the Hall sensors.

10. A smart wearable device, characterized by, The application adopts the anti-shake micro-display module as claimed in any one of claims 1 to 9.

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