Self-aware stretchable micro-led display device conformal to building curved surface

Abstract

This invention discloses a self-sensing stretchable Micro-LED display device conformally to architectural curved surfaces, comprising: a flexible substrate, multiple display nodes, and multiple elastic stress bridges. The display nodes are fixed to the flexible substrate in a two-dimensional array, and each node integrates a Micro-LED pixel unit and a driving circuit. The elastic stress bridges connect adjacent display nodes, forming a four-way interconnected network, and are made of a conductive material whose resistance monotonically changes with deformation. When the device deforms while conforming to the architectural curved surface, the elastic stress bridges absorb mechanical stress through their own extension or contraction, providing buffering for the nodes. For each node, the main controller acquires the resistance change data of the elastic stress bridges connected in its four directions, calculates the curvature of the surface in the area where the node is located, corrects the input image signal, and finally drives the Micro-LED pixel unit to display a distortion-free image adapted to the current architectural curved surface. This invention achieves adaptive fitting and intelligent display of the display device to complex architectural curved surfaces.

Description

Technical Field

[0001] This invention relates to the field of semiconductor optoelectronic technology, and in particular to a self-sensing stretchable Micro-LED display device that conforms to the curved surface of a building. Background Technology

[0002] With the advancement of display technology and the development of architectural aesthetics, integrating high dynamic range and high brightness displays with building facades and interior spaces has become an important trend in architectural design and digital media art. Micro-LED (micro light-emitting diode) technology, due to its superior characteristics such as self-illumination, high brightness, high contrast, long lifespan, and fast response speed, is regarded as an ideal solution for realizing next-generation integrated building displays.

[0003] However, applying traditional Micro-LED display devices to building structures with curved, irregular, or non-circular surfaces faces fundamental technical challenges, severely limiting their application scope and visual effects. Existing technical solutions mainly suffer from problems at the following two levels: First, there's the issue of physical bonding and structural reliability. Currently, mainstream Micro-LED displays are typically composed of numerous rigid display modules spliced ​​together. When covering curved building surfaces, this can only be achieved by splicing together a large number of small, rigid flat panels in a polygonal approximation manner. This results in permanent, visible physical gaps on the display surface, disrupting the visual continuity and overall aesthetics of the building. More importantly, forcibly installing rigid modules on curved surfaces generates continuous installation stress. Furthermore, the minute deformations of the building due to temperature changes and wind loads are directly transmitted to the brittle Micro-LED chips and circuits, potentially leading to connection failures, solder joint cracking, or chip damage over time, posing a serious challenge to reliability.

[0004] Secondly, there's the issue of visual display and image calibration. Even if the display screen can physically conform to a curved surface, the surface is no longer an ideal plane. From a fixed viewing point, this inevitably leads to severe image geometric distortion and uneven brightness. Existing calibration methods largely rely on pre-installed, offline camera calibration and software deformation, which are complex processes. Furthermore, calibration fails even with minor changes in the installation configuration (such as thermal expansion and contraction or structural settlement), failing to achieve "instant display" and long-term stable visual effects. In addition, to achieve deformation perception, an additional network of optical or mechanical sensors is typically deployed outside the display system, increasing system complexity, cost, and affecting the overall aesthetics.

[0005] Therefore, the question is how to provide a Micro-LED display device that can truly adapt to complex and varied architectural surfaces, ensuring long-term mechanical reliability while guaranteeing that the displayed image is free from visual distortion. Summary of the Invention

[0006] In view of the aforementioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a self-sensing stretchable Micro-LED display device that conforms to the curved surface of a building, which is designed to adaptively fit the curved surface of a building and correct the displayed image in real time.

[0007] To achieve the above objectives, the present invention discloses a self-sensing stretchable Micro-LED display device conforming to the curved surface of a building, the display device comprising: Flexible substrate; Multiple display nodes are fixed on the flexible substrate in a two-dimensional array, and each display node integrates a Micro-LED pixel unit and its pixel driving circuit. Multiple elastic stress bridges, each connecting two adjacent display nodes, form a four-way interconnected network among the display nodes; wherein, the elastic stress bridges are made of conductive materials whose resistance values ​​change monotonically with their deformation; when the display device deforms due to conforming to the curved surface of the building, the elastic stress bridges absorb mechanical stress by extending or contracting themselves, providing mechanical buffer for the display nodes and the components thereon. The display device further includes a main controller, which is configured to: For each display node, the resistance change data of the elastic stress bridges connected in its four directions are obtained; based on the resistance change data, the curvature data of the corresponding area where the display node is located is calculated; and based on the curvature data of all the display nodes, the input image signal is corrected to drive each Micro-LED pixel unit, thereby displaying an image adapted to the current building surface.

[0008] Optionally, the main controller is configured to calculate the surface curvature data of the area where the display node is located in the following manner: The resistance changes of the elastic stress bridges in the four directions of the display node are converted into axial strain values ​​in the corresponding directions, respectively. Based on the four axial strain values, one or more principal curvature parameters corresponding to the surface curvature data of the region where the display node is located are calculated.

[0009] Optionally, the configuration for the main controller to correct the input image signal includes: Based on the surface curvature data of all the display nodes, the three-dimensional shape of the display device is reconstructed; A mapping relationship is established from the two-dimensional coordinates of the input image to the physical display position on the three-dimensional shape; wherein, the mapping relationship is calculated by intersecting the three-dimensional shape with the light rays originating from the preset viewing point; For each physical display position after mapping, a brightness compensation coefficient is calculated based on the angle between the local orientation of the surface it is located on and the viewing direction, and the original pixel value is modulated. The modulated pixel value is converted into a driving signal and output to the corresponding pixel driving circuit.

[0010] Optionally, the elastic stress bridge is constructed as a metal wire with a periodic meandering structure, the meandering structure being composed of multiple repeating periodic units, and the cross-section of the metal wire is a flat rectangle with a width greater than its thickness, to provide flexibility in the perpendicular bonding direction and optimize its deformation behavior and resistance response characteristics in the in-plane tensile direction.

[0011] Optionally, the metal wire is made of an annealed metal alloy, which forms a preferred orientation of grains within the alloy and a reinforcing protective layer at the inflection points of the meandering structure to reduce the temperature sensitivity of the resistance and suppress the generation of fatigue cracks under cyclic deformation.

[0012] Optionally, the main controller is further configured to: distinguish between the static deformation of the elastic stress bridge caused by conforming to the building surface and the dynamic micro-deformation caused by environmental wind vibration or thermal expansion, and to adopt a filtering algorithm and response strategy corresponding to the deformation type for the correction of the input image signal.

[0013] Optionally, the display device further includes an ambient light sensor; the main controller is configured to dynamically adjust the display brightness and refresh rate of all or part of the Micro-LED pixel units based on the ambient light data collected by the ambient light sensor.

[0014] The beneficial effects of this invention are as follows: 1. This invention uses an elastic stress bridge to connect rigid display nodes to form a stretchable network, enabling the entire display device to adaptively conform to any complex architectural surface like a flexible skin, fundamentally eliminating the physical gaps caused by traditional rigid module splicing. The stress bridge actively absorbs mechanical stress during deformation, providing reliable mechanical buffering and protection for the brittle Micro-LED chips and circuits, significantly improving long-term structural reliability and service life in dynamic building environments. 2. This invention utilizes the resistance change of the elastic stress bridge itself as a sensing signal, allowing the display screen to perceive its own three-dimensional deformation in real time and with high precision without any external sensors. Based on this global deformation data, the main controller can perform real-time geometric and brightness correction of the displayed content through surface reconstruction and ray tracing algorithms. This ensures that regardless of how the screen is curved, a visually pleasing image with no optical distortion and uniform brightness can be obtained from the main viewing angle, achieving instant display and continuously stable high-quality display. 3. The modular stretchable design of this invention allows it to perfectly conform to various irregular architectural surfaces, simplifying installation. Meanwhile, targeted material processing techniques (such as alloy annealing and inflection point enhancement) significantly improve the sensor's fatigue resistance and temperature drift resistance in outdoor environments. Furthermore, the ability to intelligently distinguish between static deformation and dynamic interference further ensures the stability of the display output. These features collectively enable the device to be reliably applied in complex scenarios requiring high standards and long lifespans, such as building curtain walls and artistic domes, promoting the deep integration of architecture and display technology.

[0015] In summary, the invention, through collaborative innovation in hardware structure and control algorithm, adaptively fits the curved surface of a building and corrects the visual distortion caused by the curved surface in real time. Attached Figure Description

[0016] Figure 1 This is a front structural schematic diagram of a self-sensing stretchable Micro-LED display device conforming to the curved surface of a building, provided in a specific embodiment of the present invention. Figure 2 This is a control flowchart corresponding to a self-sensing stretchable Micro-LED display device conforming to the curved surface of a building, provided by a specific embodiment of the present invention. Detailed Implementation

[0017] This invention discloses a self-sensing stretchable Micro-LED display device conforming to architectural curved surfaces. Those skilled in the art can refer to the content of this document and appropriately modify the technical details to achieve the desired implementation. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The device and application of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the device and application described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0018] This invention provides a self-sensing stretchable Micro-LED display device that conforms to architectural surfaces, such as... Figure 1 As shown, the display device includes: Flexible substrate 1; Multiple display nodes 2 are fixed on the flexible substrate 1 in a two-dimensional array, and each display node 2 integrates a Micro-LED pixel unit and its pixel driving circuit. Multiple elastic stress bridges 3, each elastic stress bridge 3 connects two adjacent display nodes 2, so that the display nodes 2 form a four-way interconnected network; wherein, the elastic stress bridge 3 is made of a conductive material whose resistance value changes monotonically with its deformation. When the display device deforms due to conforming to the curved surface of the building, the elastic stress bridge 3 absorbs mechanical stress by extending or contracting itself, providing mechanical buffer for the display node 2 and the components on it. The display device also includes a main controller 4, which is configured to: For each display node 2, the resistance change data of the elastic stress bridges 3 connected in its four directions are obtained; based on the resistance change data, the surface curvature data of the corresponding display node 2 area is calculated; and based on the surface curvature data of all display nodes 2, the input image signal is corrected to drive each Micro-LED pixel unit, thereby displaying an image adapted to the current building surface.

[0019] The various modules of the display device corresponding to the embodiments of the present invention are described below: 1. Flexible substrate 1 The flexible substrate 1 is the main supporting structure of the display device. Its core function is to provide macroscopic mechanical support and enable the device as a whole to adapt to macroscopic curvature changes on the building surface. During implementation, the substrate should possess the following characteristics: First, it must have good stretchability and flexibility to allow for a large range of elastic deformation of itself and the node network fixed on it; second, it must have excellent optical transmittance to ensure that light emitted from the Micro-LED pixel units can be efficiently transmitted without affecting display brightness and image quality; finally, it should have a certain degree of environmental stability and encapsulation protection capabilities, able to withstand outdoor environmental factors such as temperature and humidity, and provide basic protection for internal components. Its material can be transparent polydimethylsiloxane (PDMS), thermoplastic polyurethane (TPU), or other similar polymer elastomers.

[0020] 2. Display node 2 Display node 2 is a functional unit that carries the core light-emitting and driving functions while maintaining local rigidity. Each display node 2 is essentially a miniature, highly integrated rigid functional island. Its rigidity ensures that the delicate and fragile Micro-LED chips and semiconductor driving circuits are protected from direct bending stress when the substrate deforms as a whole, thus guaranteeing the stability and reliability of their photoelectric performance. Specifically, a "Micro-LED pixel unit" refers to a basic pixel composed of red, green, and blue Micro-LED microchips, enabling full-color display. The "pixel driving circuit" is a miniature integrated circuit integrated on the same node, used to receive driving signals from the main controller 4 and precisely control the switching, grayscale, and color of the Micro-LED pixel units. The nodes are "fixed" to the flexible substrate 1 in a two-dimensional array, meaning that physical bonding is achieved through embedding, bonding, or microstructure anchoring, ensuring that there is no relative sliding or detachment between the nodes and the substrate when the substrate deforms.

[0021] 3. Elastic stress bridge 3 The elastic stress bridge 3 is the core innovative component that realizes the "self-sensing" and "stretchable" functions of this invention. It performs three functions: electrical interconnection, mechanical buffering, and deformation sensing.

[0022] Structural and electrical interconnection: Each stress bridge connects two adjacent display nodes 2, forming a path for transmitting power and data signals between nodes. It is itself a conductor.

[0023] Mechanical buffering principle: When the flexible substrate 1 is forced to deform due to conforming to the curved surface, the stress bridge of the connecting node will absorb and release most of the mechanical strain energy through its own extension (stretching) or contraction (compression). This process transforms the macroscopic deformation into the microscopic geometric change of the stress bridge itself, thereby isolating and protecting the rigid display node 2 and the internal chips and circuits, so that they are hardly subjected to stress.

[0024] Deformation sensing principle: Stress bridges are made of special conductive materials (such as metal alloys with high strain coefficients) whose resistance changes monotonically with their deformation. When they stretch or contract due to mechanical buffering, their geometry (length, cross-sectional area) changes, causing a synchronous, continuous, and reversible change in their resistance. Therefore, by monitoring the resistance value of each stress bridge in real time, the relative displacement or strain between the two nodes it connects can be accurately deduced, thereby obtaining the microscopic deformation distribution on the surface of the display device.

[0025] 4. Main Controller 4 The main controller 4 is the brain of the display device, responsible for coordinating data acquisition, information processing and display control. Its working logic forms a complete perception-control closed loop.

[0026] Data acquisition: The main controller 4 reads the resistance data of the elastic stress bridges 3 in four directions (up, down, left, and right) connected to each display node 2 in real time through the electrical connection network formed by the elastic stress bridges 3, either in a polling or parallel manner.

[0027] Data Processing and Curvature Calculation: The controller's built-in processor converts the acquired resistance change data, combined with preset material strain coefficients, into local strain values ​​in four directions. Based on the principles of continuum mechanics and differential geometry, the strain information of a point in multiple directions is sufficient to calculate the local bending characteristics (such as principal curvature and principal direction) of the surface at that point. By performing this calculation on all nodes, a dataset describing the degree of surface curvature of the entire display device in its current three-dimensional form can be obtained.

[0028] Image Correction and Driving: The controller receives the standard two-dimensional image signal to be displayed. Using the previously calculated global surface curvature data, it performs real-time pre-distortion compensation calculations on the position and brightness of each pixel in the original image through graphics algorithms (such as 3D surface reconstruction and viewpoint-based reverse ray casting), generating a corrected image customized for the specific surface shape. Finally, the corrected image signal is converted into driving commands and sent to the pixel driving circuits of each display node 2 via the same network, driving the Micro-LED pixel units to emit light, allowing the viewer to observe a geometrically correct, uniformly bright, distortion-free image from a preset viewing angle.

[0029] In this specific embodiment, the main controller 4 is configured to calculate the surface curvature data of the region where the display node 2 is located in the following manner: The resistance changes of the elastic stress bridge 3 in the four directions of node 2 will be displayed and converted into axial strain values ​​in the corresponding directions. Based on the four axial strain values, one or more principal curvature parameters are calculated to obtain the surface curvature data of the region where the corresponding display node 2 is located.

[0030] It should be noted that the core of the main controller 4's surface perception lies in converting resistance signals into geometric parameters. Specifically, the system first calculates the precise axial strain value in the corresponding direction based on the resistance changes of the stress bridges in the four directions of each display node 2, using a pre-calibrated resistance-strain relationship formula. Subsequently, the system treats this set of two-dimensional strain data as a representation of the differential geometric characteristics of the local surface at that node, and calculates one or two principal curvature parameters at that point using numerical methods (such as solving the Cauchy-Green strain tensor or fitting a quadratic surface). These principal curvature parameters quantify the degree and direction of the surface curvature at that point, providing the precise mathematical basis for subsequent 3D reconstruction and image correction.

[0031] In this specific embodiment, the configuration of the main controller 4 to correct the input image signal includes: Based on the surface curvature data of all display nodes 2, the three-dimensional shape of the display device is reconstructed; A mapping relationship is established from the two-dimensional coordinates of the input image to the physical display position on the three-dimensional shape; wherein, the mapping relationship is calculated by intersecting the light rays originating from the preset viewing point with the three-dimensional shape; For each physical display position after mapping, a brightness compensation coefficient is calculated based on the angle between the local orientation of the surface it is located on and the viewing direction, and the original pixel value is modulated. The modulated pixel value is converted into a driving signal and output to the corresponding pixel driving circuit.

[0032] It should be noted that, to achieve adaptive display, the system executes a real-time image processing pipeline. This process begins by using the curvature data of all nodes to reconstruct a continuous and smooth 3D digital model of the display surface through surface interpolation or physical constraint optimization algorithms. Next, for a preset viewing area, the system uses parallel computation to reverse-map each pixel of the input image onto the surface of this 3D model. The principle is to calculate the intersection of the line of sight from the viewing point and the model surface. For each mapped 3D display point, the system applies a light attenuation model for brightness compensation based on the angle between the surface normal and the line of sight, modulates the original pixel value, and finally generates a driving signal adapted to the current surface.

[0033] In this specific embodiment, the elastic stress bridge 3 is constructed as a metal wire with a periodic meandering structure, the meandering structure being composed of multiple repeating periodic units, and the cross-section of the metal wire being a flat rectangle with a width greater than its thickness, in order to provide flexibility in the vertical bonding direction and optimize its deformation behavior and resistance response characteristics in the in-plane tensile direction.

[0034] It should be noted that the stress bridge is specifically manufactured as a metal microstructure with a finely crafted, periodic, meandering pattern, such as a serpentine or zigzag layout. This meandering structure is composed of multiple identical periodic units connected in series. Its core design lies in the specially designed flat rectangular cross-section of the metal conductor, whose width is significantly greater than its thickness. This design allows the stress bridge to be easily bent to adapt to curved surfaces in the direction perpendicular to the mounting surface, while its deformation is more controllable and uniform when stretched in a plane. This ensures better linearity and repeatability between resistance changes and macroscopic deformation, thus improving the reliability of the sensing signal.

[0035] Furthermore, the metal wire is made of an annealed metal alloy, which forms a preferred grain morphology inside the alloy and forms an enhanced protective layer at the inflection points of the meandering structure to reduce the temperature sensitivity of the resistance and suppress the generation of fatigue cracks under cyclic deformation.

[0036] It should be noted that the metal wires used to manufacture the stress bridge are not ordinary conductors, but alloy materials treated with a specific annealing process. This treatment aims to induce a preferred orientation texture among the alloy's internal grains to stabilize its electromechanical properties. More importantly, at each corner or stress concentration point of the meandering stress bridge structure, an additional inorganic or polymer-reinforced protective layer is formed through micromachining. This protective layer serves a dual purpose: firstly, it suppresses resistance drift caused by ambient temperature fluctuations; secondly, it improves the metal's fatigue life, preventing cracks from forming at inflection points during repeated deformation, thus avoiding open circuits.

[0037] In this specific embodiment, the main controller 4 is further configured to: distinguish between the static deformation of the elastic stress bridge 3 caused by conforming to the building surface and the dynamic micro-deformation caused by environmental wind vibration or thermal expansion, and to adopt a filtering algorithm and response strategy corresponding to the deformation type for the correction of the input image signal.

[0038] It should be noted that the system's main controller 4 possesses advanced signal processing capabilities, enabling it to intelligently distinguish the source and nature of deformation. This is achieved through time-domain and frequency-domain analysis of resistance change data: static deformation caused by installation manifests as a stable DC offset signal, while dynamic micro-deformation caused by wind vibration or thermal expansion and contraction manifests as AC fluctuations in a specific frequency band superimposed on the DC signal. The system employs differentiated processing strategies for these two distinct deformation modes. For example, it uses high-precision correction mapping for static deformation and real-time filtering and smoothing algorithms for dynamic micro-deformation, thereby ensuring stable display content while preventing flickering or blurring caused by momentary jitter.

[0039] In this specific embodiment, the display device further includes an ambient light sensor; the main controller 4 is configured to dynamically adjust the display brightness and refresh rate of all or part of the Micro-LED pixel units based on the ambient light data collected by the ambient light sensor.

[0040] It should be noted that the display device integrates an ambient light sensor module. This module continuously monitors the light intensity of the environment in which the device is located. The main controller 4 receives this light data and, based on a preset or programmable luminance-illuminance response curve, automatically and dynamically adjusts the overall output brightness of the entire display screen or a specific zone. In extremely low ambient light conditions, the system may also simultaneously reduce the refresh rate of the entire or local area. This implementation not only optimizes viewing comfort and achieves harmony between the displayed content and the ambient brightness, but more importantly, it significantly reduces the overall energy consumption of the device at night or in indoor environments, reflecting the intelligent and energy-saving characteristics of the building.

[0041] In this specific embodiment, the control flow corresponding to the device of the present invention is as follows: Figure 2 As shown, it includes: S1. The main controller 4 uses the measurement circuit integrated on the display node 2 to synchronously or at high speed poll the real-time resistance values ​​of the elastic stress bridges 3 in the four directions of all display nodes 2, so as to continuously capture the overall shape changes of the display device.

[0042] S2, the main controller 4 converts the resistance change in the four directions of each display node 2 into local strain values ​​according to the pre-calibrated strain coefficient, and calculates the local surface curvature parameters of the node area through a geometric algorithm to quantify its bending state.

[0043] S3 and the main controller 4 collect the local curvature parameters and position coordinates of all display nodes 2, and use surface interpolation and smoothing algorithms to dynamically reconstruct a continuous and smooth three-dimensional digital surface model that describes the surface morphology of the entire display device.

[0044] S4 and the main controller 4 calculate the physical coordinates of each pixel of the input image by combining the three-dimensional surface model and the preset viewing point and performing reverse mapping calculations using a ray tracing algorithm.

[0045] S5 and the main controller 4 calculate the brightness compensation coefficient based on the angle between the surface normal vector and the line-of-sight vector at each physical display point, and perform edge optimization based on the local curvature to complete the real-time geometric and optical compensation modulation of the original pixel value.

[0046] S6, the main controller 4 distributes the corrected pixel driving signal to the driving circuit of the corresponding display node 2 through the communication network formed by the elastic stress bridge 3, driving the Micro-LED pixel unit to emit light, and finally presenting a complete picture with no geometric distortion and uniform brightness from the preset viewing angle.

[0047] This invention, through the elastic stress bridge 3 connecting the rigid display nodes 2 to form a stretchable network, enables the entire display device to adaptively conform to any complex architectural surface like a flexible skin, fundamentally eliminating the physical gaps caused by traditional rigid module splicing. The stress bridge actively absorbs mechanical stress during deformation, providing reliable mechanical buffering and protection for the brittle Micro-LED chips and circuits, significantly improving long-term structural reliability and service life in dynamic building environments.

[0048] This invention utilizes the resistance change of the elastic stress bridge 3 as a sensing signal, enabling the display screen to perceive its own three-dimensional deformation in real time and with high precision without any external sensors. Based on this global deformation data, the main controller 4 performs real-time geometric and brightness correction on the displayed content through surface reconstruction and ray tracing algorithms. This ensures that regardless of the screen's curvature, a visually pleasing image with no optical distortion and uniform brightness can be obtained from the primary viewing angle, achieving instant display and consistently stable high-quality display.

[0049] The modular, stretchable design of this invention allows it to perfectly fit various irregularly shaped building surfaces, simplifying installation. Simultaneously, targeted material processing (such as alloy annealing and inflection point reinforcement) significantly improves the sensor's fatigue resistance and temperature drift resistance in outdoor environments. Furthermore, the ability to intelligently distinguish between static deformation and dynamic interference further ensures the stability of the display output. These features collectively enable the device to be reliably applied in complex scenarios requiring high standards and long lifespans, such as building curtain walls and artistic domes, promoting the deep integration of architecture and display technology.

[0050] In summary, the invention, through collaborative innovation in hardware structure and control algorithm, adaptively fits the curved surface of a building and corrects the visual distortion caused by the curved surface in real time.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0052] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A self-sensing stretchable Micro-LED display device conforming to architectural curved surfaces, characterized in that, The display device includes: Flexible substrate; Multiple display nodes are fixed on the flexible substrate in a two-dimensional array, and each display node integrates a Micro-LED pixel unit and its pixel driving circuit. Multiple elastic stress bridges, each connecting two adjacent display nodes, form a four-way interconnected network among the display nodes; wherein, the elastic stress bridges are made of conductive materials whose resistance values ​​change monotonically with their deformation; when the display device deforms due to conforming to the curved surface of the building, the elastic stress bridges absorb mechanical stress by extending or contracting themselves, providing mechanical buffer for the display nodes and the components thereon. The display device further includes a main controller, which is configured to: For each display node, the resistance change data of the elastic stress bridges connected in its four directions are obtained; based on the resistance change data, the curvature data of the corresponding area where the display node is located is calculated; and based on the curvature data of all the display nodes, the input image signal is corrected to drive each Micro-LED pixel unit, thereby displaying an image adapted to the current building surface.

2. The self-sensing stretchable Micro-LED display device conforming to architectural surfaces according to claim 1, characterized in that, The main controller is configured to calculate the surface curvature data of the region where the display node is located in the following manner: The resistance changes of the elastic stress bridges in the four directions of the display node are converted into axial strain values ​​in the corresponding directions, respectively. Based on the four axial strain values, one or more principal curvature parameters corresponding to the surface curvature data of the region where the display node is located are calculated.

3. The self-sensing stretchable Micro-LED display device conforming to architectural surfaces according to claim 1, characterized in that, The configuration for the main controller to correct the input image signal includes: Based on the surface curvature data of all the display nodes, the three-dimensional shape of the display device is reconstructed; A mapping relationship is established from the two-dimensional coordinates of the input image to the physical display position on the three-dimensional shape; wherein, the mapping relationship is calculated by intersecting the three-dimensional shape with the light rays originating from the preset viewing point; For each physical display position after mapping, a brightness compensation coefficient is calculated based on the angle between the local orientation of the surface it is located on and the viewing direction, and the original pixel value is modulated. The modulated pixel value is converted into a driving signal and output to the corresponding pixel driving circuit.

4. The self-sensing stretchable Micro-LED display device conforming to architectural surfaces according to claim 1, characterized in that, The elastic stress bridge is constructed as a metal wire with a periodic meandering structure, which consists of multiple repeating periodic units, and the cross-section of the metal wire is a flat rectangle with a width greater than its thickness, in order to provide flexibility in the perpendicular bonding direction and optimize its deformation behavior and resistance response characteristics in the in-plane tensile direction.

5. The self-sensing stretchable Micro-LED display device conforming to architectural surfaces according to claim 4, characterized in that, The metal wire is made of an annealed metal alloy, which forms a grain morphology with preferred orientation inside the alloy and forms a reinforcing protective layer at the inflection point of the meandering structure to reduce the temperature sensitivity of the resistance and suppress the generation of fatigue cracks under cyclic deformation.

6. The self-sensing stretchable Micro-LED display device conforming to architectural surfaces according to claim 1, characterized in that, The main controller is further configured to: distinguish between the static deformation of the elastic stress bridge caused by conforming to the curved surface of the building and the dynamic micro-deformation caused by environmental wind vibration or thermal expansion, and to use a filtering algorithm and response strategy corresponding to the deformation type to correct the input image signal.

7. The self-sensing stretchable Micro-LED display device conforming to architectural surfaces according to claim 1, characterized in that, The display device further includes an ambient light sensor; the main controller is configured to dynamically adjust the display brightness and refresh rate of all or part of the Micro-LED pixel units based on the ambient light data collected by the ambient light sensor.

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