Self-adhesive colour changing universal sleeve cover for mobile devices

Abstract

The present disclosure relates to a universally adaptable phone agnostic self-adhesive, electronically colour-changing sleeve (100) for mobile devices (150). The sleeve comprises a flexible back panel (102) with a bi-stable display (108) and a reusable adhesive layer (104) for attachment, together with a flexible side band (112) housing electronic components (120) including a control circuit (122) and a power source (128). The back panel and side band are joined by a hidden connector (118) to provide a thin, integrated second-skin appearance. The sleeve is universally adaptable, with guide markings (146) for trimming to different phone models and creating openings for cameras (152), fingerprint sensors (154), and other features. The display (108) retains images without power, while energy is supplied via battery (128), wireless charging (130), or solar cells (110). Optional NFC / BLE modules (124, 126), sensors (132–144), and a mobile application (160) enable smart, automated, and group-based customization.

Description

[0001] SELF-ADHESIVE COLOUR CHANGING UNIVERSAL SLEEVE COVER

[0002] FOR MOBILE DEVICES

[0003] FIELD OF THE EMBODIMENTS

[0004] The present disclosure relates to the field of mobile device accessories and display technology. More particularly, it pertains to a self-adhesive colour-changing sleeve / cover, which provides a dynamic, customizable outer surface for the mobile devices. The sleeve incorporates a thin electronic display (such as e-paper) along with its associated electronics in a form factor that adheres to the phone like a second skin, enabling appearance of the phone to change colour or pattern on demand while preserving a sleek, integrated look.

[0005] BACKGROUND OF THE EMBODIMENTS

[0006] Everybody uses a mobile phone these days. It is a basic item that one carries around at all times. People use it to connect with others, conduct business, capture memories, for entertainment, and much more. Mobile phones have become an integral part of people’s lives, and people take utmost care to protect them and keep them safe. Once damaged, they are expensive to replace and might even become damaged beyond repair, which often results in the loss of important data stored on the device.

[0007] To protect a mobile phone, many people use a phone cover. Phone covers are usually made from shock-absorbent materials such as leather, silicone, and plastics. The cover helps protect the phone from bumps, impacts, and drops. Mobile phone covers also come with additional attachments that make a user’s life more convenient, such as a card-holder cover, in which a person can keep their cards and avoid carrying a separate card holder, or a lanyard cover, which allows the phone to be hung around the neck so that the user does not have to worry about losing it. Phone covers are also widely used as a means of self-expression and personalization. Many individuals own multiple covers and frequently change them to suit different moods, outfits, or occasions. For example, some covers have a mirror-like finish to quickly check one’s reflection, while others display the colours of a favourite sports team during a tournament. In this way, accessories reflect a user’s identity and personality. However, changing mobile covers frequently is a hassle. Putting them on and off not only damages the integrity of the cover itself, but can also wear down the phone’s buttons. Maintaining multiple covers also consumes space. Furthermore, when a person upgrades to a different phone model, previously collected covers become useless, which is both wasteful and inconvenient.

[0008] Various prior solutions have attempted to address these issues but remain inadequate. One common approach is the use of thin adhesive skins or wraps, which provide a factory -fit look and preserve the slim profile of the device. However, such skins are static and cannot be altered once applied, requiring physical removal and replacement each time the user wants a different appearance.

[0009] Another approach is the use of decorative hard-shell cases, which provide protection and a variety of designs but are bulky, model-specific, and often become obsolete when the user switches to a new phone. Frequent attachment and removal can also cause wear and tear to both the case and the phone.

[0010] Some accessories incorporate electronic displays such as e-paper or e-ink to allow limited customization of colours or images. While these cases provide a degree of dynamic personalization, they are generally rigid hard-shell designs tailored to specific phone models, thereby restricting compatibility. They also add noticeable bulk and weight to the phone and typically cover only the back panel without addressing the sides or edges, resulting in a less integrated appearance.

[0011] Other approaches rely on electrochromic or thin-film technologies that can change colour when voltage is applied. While these demonstrate the possibility of a dynamic appearance, they are usually implemented as fixed rear covers or panels that are not universally adaptable. They also suffer from durability concerns, as repeated cycling often leads to material degradation and limited lifespan.

[0012] Certain cases have been developed using LEDs, OLED strips, or micro-displays to create lighting effects or icons on the phone’s exterior. However, these are powerintensive, tend to be bulky, and do not provide the sleek, second-skin look desired for everyday use. Other products rely on magnetic or modular covers, where external shells can be swapped or snapped into place. While this provides some variety, the approach is still static, limited to the number of panels owned, and adds weight and complexity. Some covers use thermochromic or photochromic materials that change colour based on temperature, touch, or light exposure. While visually interesting, these effects are passive, limited in colour range, cannot be controlled by the user, and tend to fade or wear out over time.

[0013] Experimental concepts also include projection-based accessories, in which miniature projectors cast images or colours onto the case surface. However, these require bulky hardware, consume high power, and are not practical for regular consumer use.

[0014] Therefore, while prior attempts illustrate various ways to customize the appearance of mobile devices, they remain limited by one or more drawbacks, including bulkiness, static nature, model-specific construction, high power consumption, lack of reusability, and insufficient integration of smart or sustainable features. Accordingly, there exists a need for an improved mobile phone accessory that involves the slim profile of skins, the dynamic customization capability of electronic display covers, universal adaptability across models, reusability, and advanced power-efficient operation, while overcoming the disadvantages of prior approaches.

[0015] OBJECTIVE OF THE EMBODIMENTS

[0016] An object of the present disclosure is to provide a colour-changing mobile phone sleeve that may change its colour, pattern, or design on demand as per the user’s preference, thereby eliminating the monotony of static phone cases and skins. A single sleeve may offer virtually infinite aesthetic variations, allowing users to match their phone to any outfit, mood, or occasion effortlessly.

[0017] Another object of the present disclosure is to achieve a second-skin form factor that adheres flush to the phone’s surface, including both the back and sides, without adding significant bulk or altering the phone’s silhouette, so that the sleeve maintains the slim and sleek feel of the device for a premium and integrated look, rather than the chunky appearance of conventional add-on cases.

[0018] A further object of the present disclosure is to design the sleeve as a universally adaptable accessory that may fit essentially all standard smartphone shapes and sizes, including by providing cut guides or modular components to accommodate different camera placements, button layouts, and phone dimensions, so that a single product may be customized for any model and thereby reduce waste and the need for multiple model-specific products.

[0019] Another object of the present disclosure is to provide ease of application and reusability through a self-adhesive backing that may allow the sleeve to be easily applied and removed from the phone’s surface without damage, the adhesive being durable and reusable such that the sleeve may be repositioned or transferred to another device multiple times without significant loss of adhesion, thus offering practicality for real-world use while avoiding the disposability associated with onetime stickers.

[0020] An additional object of the present disclosure is to implement bi-stable display technology, such as e-ink or electrochromic films, which may require little to no power to maintain a given image or colour state and consume energy only when actively changing appearance, thereby enabling operation for extended periods on a small battery without burdening the user with frequent charging.

[0021] A related object of the present disclosure is to integrate a compact, efficient power source, such as a micro rechargeable battery, capable of supporting many updates per charge, together with convenient charging methods including wireless charging compatibility, NFC-based power harvesting, or thin solar cells, so that recharging may occur without compromising the slim design or requiring significant user intervention.

[0022] Another object of the present disclosure is to provide smart sensing and automation, whereby optional sensors such as heart rate, skin temperature, or motion detectors may detect physiological or environmental context and cause the sleeve’s controller to automatically adjust the displayed colour or pattern, and wherein the sleeve may further interact with external triggers, such as NFC tags embedded in clothing or smartphone data, to match the phone’s look to the user’s outfit or activity.

[0023] A further object of the present disclosure is to provide connectivity and interactive features by including wireless communication modules such as NFC and Bluetooth Low Energy, so that the sleeve may communicate with the smartphone and with other sleeves, thereby enabling app-based control, outfit synchronization, and group synchronization of colours or patterns, adding social and functional value beyond mere appearance change.

[0024] Another object of the present disclosure is to ensure that the sleeve is durable, flexible, and reliable, through the use of robust materials capable of withstanding daily handling, minor drops, and environmental factors, while maintaining performance in terms of colour clarity, adhesion, and electronics over a long lifespan of usage cycles, and to ensure a fail-safe operation such that, even when power is depleted, the sleeve may retain the last displayed colour or pattern.

[0025] A further object of the present disclosure is to provide a solution that is sustainable and eco-friendly, thereby reducing plastic consumption and electronic waste by replacing the need for multiple cases with a single universal sleeve.

[0026] Another object of the present disclosure is to deliver cost-effectiveness, such that a user may achieve varied personalization through one reusable sleeve rather than purchasing multiple covers.

[0027] Yet another object of the present disclosure is to allow the sleeve to display not only colours and patterns but also custom text, icons, or notifications, thereby extending its use beyond aesthetics to practical functions.

[0028] An additional object is to enhance the premium appeal of the product by offering various surface finishes, including matte, glossy, leather-like, or metallic veneers, for a luxury feel.

[0029] Another object of the present disclosure is to employ a modular construction, wherein side bands or panels may be trimmed, replaced, or swapped to maintain universal adaptability. A further object is to ensure user safety and ergonomics by employing skin-safe, non-toxic, and heat-resistant materials that remain comfortable to hold during prolonged use.

[0030] Still another object is to provide fail-safe communication and operation, ensuring that in case of signal loss, the sleeve retains the last transmitted state or reverts to a default display, thereby maintaining a consistent and reliable user experience.

[0031] By achieving the foregoing objects, the present disclosure provides a universal, reusable, sustainable, and smart mobile phone sleeve that delivers enhanced personalization, functional efficiency, premium aesthetics, durability, and user experience, while overcoming the shortcomings of prior approaches.

[0032] SUMMARY OF THE EMBODIMENTS

[0033] In one aspect, the present disclosure provides a self-adhesive, electronically colourchanging sleeve (100) for mobile devices (150). The sleeve comprises a flexible back panel (102) having a bi-stable display (108) and a reusable adhesive layer (104) for attaching to the phone, together with a flexible side band (112) that houses electronic components (120) such as a control circuit (122) and a power source (128). The back panel and side band are operatively joined by a hidden connector (118) to form a thin, second-skin structure. The sleeve is universally adaptable, incorporating guide markings (146) for trimming to suit different phone models, with apertures for cameras (152), fingerprint sensors (154), and other hardware features. The bi-stable display (108) retains its state without continuous power, with energy supplied via battery (128), wireless charging (130), or optional solar cells (HO).

[0034] In another aspect, the disclosure provides a mobile device system (100) comprising a mobile phone (150) and the sleeve (100) of the foregoing aspect, together with a mobile application (160). The application provides a user interface (162) for selecting colours or patterns, transmitting instructions to the sleeve via NFC (124) or BLE (126), and monitoring the status of the sleeve including battery and sensor activity. The system may further support features such as automatic outfit matching by detecting NFC tags (164) embedded in clothing or accessories, or group synchronization wherein multiple sleeves update appearances simultaneously through a communication channel (166).

[0035] In a further aspect, the disclosure provides a method (100) of customizing the appearance of a mobile phone (150) using the sleeve (100). The method includes attaching the sleeve to the phone, selecting a desired colour or pattern through the application (160), wirelessly transmitting display instructions via NFC (124) or BLE (126), and updating the bi-stable display (108) accordingly. The method may also include trimming the sleeve along guide markings (146) to suit different phone models, and enabling automatic appearance changes triggered by sensor inputs (132-144), NFC tags (164), schedules, or locations. The method further supports synchronizing multiple phones fitted with the sleeve to achieve coordinated updates.

[0036] In yet another aspect, the disclosure provides a universal, reusable, and low-power sleeve (100) that integrates a bi-stable display (108), adhesive attachment (104), and modular adaptability (146) into a single unit. This combination replaces the need for multiple decorative cases by offering countless reconfigurable appearances while maintaining the sleek profile of the device, thereby delivering a practical and sustainable solution for mobile phone personalization.

[0037] BRIEF DESCRIPTION OF THE DRAWINGS OF THE EMBODIMENTS

[0038] Other objects, features, and advantages of the embodiment will be apparent from the following description when read with reference to the accompanying drawings. In the drawings, wherein like reference numerals denote corresponding parts throughout the several views:

[0039] Figure 1 illustrates a perspective view of the self-adhesive colour-changing sleeve (100) applied to a mobile phone (150), showing the flexible back panel (102) and flexible side band (112).

[0040] Figure 2(A) and 2(B) illustrates an exploded view of the sleeve (100) showing the back panel (102) with the bi-stable display (108), the adhesive layer (104), and the side band (112) housing the electronic components (120) including the control circuit (122) and power source (128). Figure 3 illustrates a sectional view of the sleeve (100) showing the laminated structure of the bi-stable display (108), the protective coating (106), and optional solar cells (110).

[0041] Figure 4 illustrates the sleeve (100) with guide markings (146) and perforations for trimming to match different phone models, and the resulting openings for a camera (152), fingerprint sensor (154), and flash (156).

[0042] Figure 5 illustrates the block diagram of the sleeve (100) showing the main components of the system.

[0043] Figure 6 illustrates a system view showing the mobile phone (150) running the application (160) with user interface (162) communicating with the sleeve (100) via NFC or BLE.

[0044] Figure 7 illustrates an embodiment of outfit matching, where the sleeve (100) updates its display based on data received from an NFC tag (164) embedded in clothing.

[0045] Figure 8 illustrates an embodiment of group synchronization, wherein multiple mobile phones (150) each fitted with a sleeve (100) update appearances simultaneously through a communication channel (166).

[0046] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0047] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

[0048] The present disclosure relates to a self-adhesive, electronically colour-changing sleeve for mobile devices. The sleeve provides a thin, flexible, second-skin that enables dynamic alteration of a device’s external appearance by means of a bi-stable electronic display while preserving a slim, integrated form factor. The disclosure addresses the need for universal compatibility, reusability, low-power operation, and smart connectivity by combining a flexible display back panel with a modular side band that houses electronics and power. The resulting accessory permits users to change colour, pattern or simple images on demand, to automate appearance changes based on context or sensors, and to synchronize looks across multiple devices, all without requiring a plurality of static cases or bulky add-ons.

[0049] Referencing Figure 1, the smart sleeve (100) comprises two primary physical components: a flexible back panel (102) and a flexible side band (104). As shown in Figure 2, the back panel (102) is shaped generally like a phone skin or back cover and is adapted to adhere to the flat rear surface of a smartphone (150); the back panel (102) incorporates a colour-changing display module formed from a thin laminated e-ink film (112) and associated layers. In some embodiments, as an alternative to the e-ink display (112), the sleeve may employ electrochromic polymer layers or liquid crystal films integrated into the back panel (102) (Figure 3) to achieve faster switching or shading effects, or a hybrid arrangement of e-ink with electrochromic overlays for richer animation. The side band (104) is a long, thin strip that attaches along the edge of the back panel (102) and wraps around the sides of the smartphone (150) to form a continuous frame, the side band (104) carrying the bulk of the electronic circuitry so that when installed the back panel (102) and side band (104) together encircle the phone’s external surfaces (excluding the screen) to present a unified, customizable exterior (Figure 1).

[0050] The back panel (102) is a multi-layer assembly optimized for durability, display performance and tactile quality; from the outer surface inward it includes an outer protective layer (110), which is a thin transparent or translucent film (for example tempered polyurethane or polycarbonate) that shields the e-ink display (112) from scratches, moisture and abrasion and which may carry anti -fingerprint or anti-glare treatments to preserve clarity and to define the user-feel (glossy, matte or textured) as illustrated in the sectional view of Figure 3. In certain variants, this protective layer (110) may itself be transparent or semi-transparent, permitting the underlying branding of the smartphone (150) to remain visible while overlaying dynamic patterns or designs from the display (112). Beneath the protective layer (110) lies the multi-colour electronic ink display layer (112) formed on a flexible plastic substrate so as to remain bendable while permitting pixel-addressable or segmented graphics; in preferred embodiments the display (112) employs multi -pigment e- paper to support a palette well beyond monochrome, enabling solid colours, patterns and simple images while maintaining a matte, paper-like finish. Depending on display architecture, a conductive matrix or thin-film transistor layer (114) may be present to drive pixel or segment addressing and is connected by a flexible ribbon to the control electronics housed in the side band (104); a flexible substrate (116) (for example PET) provides structural integrity and supports the display layers, and an innermost adhesive layer (118) on the inner face secures the panel to the smartphone (150) while permitting residue-free removal, the adhesive (118) being protected by a peel-off liner until installation (Figure 3 for the layered structure).

[0051] The back panel (102) is produced initially as a generic rectangular sheet larger than most phone backs, without pre-cut openings, to permit later customization; printed guides, templates or laser-etched outlines on the protective liner indicate cutting positions for common phone models so that camera modules (152), fingerprint sensors (154), flash modules (156) and other features may be opened without damaging embedded circuitry, and in some product variants pre-die-cut or perforated punch-out sections are supplied for popular models to ensure neat openings while critical circuitry is routed with safe margins outside anticipated cut zones (Figure 4 for guide markings and cut-out examples).

[0052] The side band (104) functions as a modular frame and carrier for electronics and is provided with an integrated connector (106) at one end that aligns and electrically mates with a corresponding connector (108) on the edge of the back panel (102); the connector pair (106 / 108) may be pogo pins, a snap-fit or overlapping flex contacts, and is positioned discretely so as to be concealed when the sleeve (100) is assembled (illustrated in the exploded view of Figure 2). The side band (104) comprises an inner flex-PCB assembly (120) and an outer elastomeric casing (122) formed of a soft polymer (for example silicone or TPU) that affords grip, minor impact absorption and conformity to devices with slight edge curvature; the band is dimensioned to cover the phone’s sides (typically about 5-7 mm wide) and remains minimal in thickness (approximately 1 mm or less) except where components reside. In certain modular embodiments, the side band (104) and back panel (102) may be detachable and magnetically connected at the connectors (106 / 108), permitting the user to upgrade or swap different bands (e.g., NFC-only, BLE- enabled, or sensor-rich versions) while reusing the same back panel (102).

[0053] Embedded within the side band (104) are the miniaturized electronics that drive the sleeve’s functionality, including a low-power microcontroller (124) for orchestrating display updates, sensor readings and communications; optional nonvolatile memory (126) for storing images and firmware; an NFC transceiver (128) connected to an antenna coil (130) for short-range data exchange and potential energy harvesting from the phone’s NFC field; an optional Bluetooth Low Energy module (132) for longer-range and background communications; a power management circuit (134) including charging control and voltage regulation; and a rechargeable micro-battery (136) (for example a thin, curved lithium -polymer or distributed film battery) positioned to minimize thickness and balance the assembly. Optional sensors (138) such as accelerometers, gyroscopes, temperature sensors, galvanic skin response electrodes and optical heart-rate sensors may be integrated either in the band (104) or at selective regions of the back panel (102) to enable context-aware features. In extended embodiments, the side band (104) may further include ultra-thin piezoelectric actuators to provide haptic feedback cues (for example vibration when notifications arrive or when the sleeve appearance changes), or integrate projection modules such as micro-LED or laser picoprojectors to cast patterns or notifications onto external surfaces, synchronized with the displayed content. The electronics are implemented using rigid-flex PCB techniques so that rigid islands host chips while flexible interconnects maintain overall flexibility; the assembly is encapsulated and protected within the outer casing (122), and a block diagram of these electronics is shown in Figure 5.

[0054] Installation and customization are straightforward: the user aligns the back panel (102) to the smartphone (150), uses the provided guide markings to cut apertures for cameras (152), fingerprint sensors (154), flash (156) and other modules, peels the protective liner and adheres the back panel via adhesive (118), attaches the side band (104) by engaging connectors (106 / 108) at one end, wraps the band around the perimeter, trims any excess length, and joins the trimmed end to the opposite end so that the seam is substantially invisible and mechanically secure; for high- volume or popular models, pre-cut swap-in modules or perforated punch-outs may be supplied instead of manual cutting to ensure clean openings, and the sleeve material is chosen to be readily cut with scissors or a craft knife without tearing or damaging nearby electronics (Figure 4 and Figure 2).

[0055] Operationally, a companion mobile application on the smartphone (150) (Figure 6) provides a user interface (162) for selecting colours, patterns or images and for configuring automation; the user selects a design in the app and initiates an update by bringing the phone into proximity of the sleeve (100) to establish NFC communication via transceiver (128) and coil (130), or by sending instructions over BLE via module (132) in embodiments that support longer-range control. The data payload need only be compact (for example a colour code or pattern identifier) and may employ standardized formats (such as NDEF) or a lightweight custom schema; upon receipt the microcontroller (124) drives the e-ink display (112) to render the selected appearance, the update completing in seconds and the bi-stable display (112) retaining the image without further energy draw until a subsequent update. In alternative embodiments, the back panel (102) may also incorporate touch-sensitive capacitive layers that allow the user to change colours or patterns by swiping or tapping directly on the sleeve surface (Figure 2). This update workflow is deliberately intentional (NFC’s short range requires user action) and therefore limits accidental or unauthorized changes; BLE, where used, permits remote control, status reporting (battery level, sensor data) and group coordination features as shown in Figure 6 and Figure 8.

[0056] The sleeve’s power strategy is optimized for minimal user maintenance: the microbattery (136) supports many e-ink refresh cycles due to the low energy per update of the bi-stable display (112) and the device’s deep-sleep architecture controlled by power circuit (134); the sleeve supports wireless recharging via an inductive coil or NFC wireless charging, opportunistic charging from the phone’s wireless charging field, and optional supplemental trickle charging via thin-film solar cells (140) positioned in non-display areas. In further embodiments, the side band (104) may additionally integrate triboelectric nanogenerators or piezoelectric films to harvest mechanical energy from finger swipes, taps, or device motion to supplement charging. In certain low-power configurations the sleeve may even perform brief updates by harvesting energy from the phone’s NFC field alone, though battery- backed designs are preferred to support sensors, BLE and more frequent updates. The disclosure further contemplates automated and sensor-driven behaviour: sensor data from modules (138) may be used by the microcontroller (124) or by the companion app to trigger autonomous appearance changes, for example, adopting dynamic or pulsing patterns during elevated heart rate or switching to subdued palettes during meetings, thereby providing a mood-ring-like personalization. Outfit coordination may be achieved by reading passive NFC tags (164) embedded in clothing or accessories (illustrated in Figure 7); the tag’s code may be mapped to a stored or cloud-hosted pattern and applied automatically to the sleeve (100), or the app may analyse a camera image of the outfit to extract dominant colours and suggest matching designs. Social and event features are enabled through BLE -based group synchronization (Figure 8), whereby one sleeve or an app / cloud service broadcasts a change and participating sleeves within range update in unison for team identification, concerts or coordinated visual effects; pairing and permission protocols ensure authorized group membership.

[0057] Materials and finishes are selected to balance aesthetics, tactile feel and protection: the outer protective film (110) and coatings define finishes such as matte, glossy or leather-like textures, transparent protective coatings preserve display clarity while resisting abrasion, and the outer casing (122) may provide a pleasant grip; the sleeve also affords minor scratch protection and edge-bumper effects, and in applications requiring heavier protection a transparent over-shell may be provided to fit over the sleeve. Durability considerations include flexible, plastic-based e-ink film (112) that resists fracture, robust adhesives (118) that tolerate multiple application cycles (with cleaning or replacement options), and encapsulation of electronics to withstand routine handling; importantly, the bi-stable display (112) ensures the last shown state is maintained in the event of battery depletion so the device does not appear blank.

[0058] Alternative embodiments and variants are within the scope of the disclosure: for example, electrochromic films, LED micro-displays or OLED strips may be used instead of e-ink at the trade-off of increased power consumption or reduced flexibility; the side band (104) may adopt different battery architectures or component distributions; bio-monitoring sensors such as hydration sensors or UV exposure detectors may be added to supplement health-linked feedback displayed on the back panel (102); BLE connectivity may synchronize not only with smartphones but also with smartwatches, rings or AR glasses to coordinate personal digital ecosystems; and the sleeve may optionally display advertising content, QR codes or sponsored imagery controlled through the mobile application. Furthermore, the same concept may be scaled to larger devices such as tablets, laptop lids, handheld gaming devices or smart hubs, using self-adhesive flexible display skins for dynamic exterior customization. The disclosure combines flexible multi-colour display technology, miniaturized flexible electronics, reusable adhesive attachment and modular mechanical design to provide a universal, reusable and low-power colour-changing sleeve (100) that enables rich, on-demand personalization of mobile devices while preserving a slim, integrated form factor. In another embodiment, the disclosure provides a method of customizing the appearance of a mobile phone (150) using the sleeve (100). The method includes attaching the sleeve (100) to the mobile phone (150) by applying the reusable adhesive layer (104) of the flexible back panel (102), trimming the sleeve (100) and side band (112) along pre-marked guide lines (146) to accommodate the phone’s hardware features, and establishing operative connection of the back panel (102) with the side band (112) through the hidden connector (118). Once installed, the user selects a desired colour, pattern or image through the companion mobile application (160), which communicates wirelessly with the control circuit (122) of the sleeve (100) via NFC (124) or BLE (126). The control circuit (122) then drives the bi-stable display (108) to update and render the selected appearance, which remains visible without continuous power. In enhanced embodiments, the method further comprises triggering automatic display updates based on sensor inputs (132-144), NFC tags (164), or contextual conditions, as well as synchronizing multiple sleeves (100) across different phones (150) through a group communication channel (166).

[0059] Advantages of the Present Disclosure

[0060] The present disclosure provides several distinct advantages over conventional mobile phone cases, skins, and decorative accessories. One major advantage is dynamic aesthetic customization, as a single sleeve (100) may electronically alter its colour, pattern, or imagery on demand through its back panel display (112), thereby eliminating the need for multiple static cases. This feature allows the user to instantly personalize the device (150) to match different outfits, moods, or occasions, offering an enhanced sense of self-expression. Another advantage lies in the ultra-thin, integrated design that functions as a second-skin with minimal bulk, preserving the original form factor of the smartphone (150). Unlike traditional protective covers, the sleeve (100) integrates seamlessly with the device surface to provide a premium and bespoke appearance.

[0061] The sleeve (100) is also designed for universal compatibility, with the modular cut- to-fit back panel (102) and adjustable side band (104) enabling one product to adapt to various smartphone models and sizes. Pre-marked templates (160), perforated punch-outs (162), or swap-in modules simplify customization, reducing the need for model-specific production. In addition, the product emphasizes reusability and practical application, employing a residue-free adhesive (118) that permits multiple reapplications without losing adhesion strength. Users may remove, clean, and reapply the sleeve (100) or transfer it to another compatible device (150), thereby extending product lifespan and reducing electronic and plastic waste.

[0062] A further advantage is low power consumption, achieved through the use of the bistable display (112) or optional electrochromic layers, which require energy only during appearance updates. This ensures that the chosen image or pattern remains visible without draining the power source, enabling long operational cycles. Extended battery life is supported through the rechargeable micro-battery (136) embedded in the side band (104), while charging convenience is offered through wireless charging coils (142), NFC-based energy harvesting via transceiver (128) and coil (130), and optional thin-film solar cells (140). In enhanced embodiments, additional mechanical energy harvesting means such as triboelectric or piezoelectric films (144) may also be incorporated to supplement charging, further improving efficiency.

[0063] Smart sensing and automation further add to the novelty of the disclosure. Integrated sensors (138), such as accelerometers, gyroscopes, temperature sensors, galvanic skin response electrodes, and optical heart-rate sensors, allow the sleeve (100) to adapt its display autonomously according to physiological or environmental inputs, effectively functioning as a digital mood-ring. Connectivity features offer another important advantage, with the NFC module (128) enabling quick and secure updates by tapping the smartphone (150) and the BLE module (132) supporting background updates, device status reporting, and group synchronization across multiple sleeves (100). In advanced embodiments, the sleeve (100) may also communicate with companion devices such as smartwatches (170) or AR glasses (172), creating a coordinated digital ecosystem.

[0064] The disclosure also introduces novel social and event capabilities. Group synchronization modes enabled by BLE (132) allow multiple sleeves (100) to update simultaneously, supporting team identification, concerts, or coordinated visual effects (Figure 8). Interactive features, such as proximity-triggered colour changes detected via BLE signal strength, provide unique social interactions. Beyond aesthetics, the sleeve (100) offers durability and reliability through the use of flexible plastic-based display films (112) resistant to cracking, encapsulated electronics (120, 124, 126, 134) capable of withstanding daily handling, and adhesives (118) that maintain performance over repeated applications. Even in the event of battery depletion, the bi-stable display (112) ensures that the last shown image remains visible, avoiding unattractive blank surfaces.

[0065] Finally, the sleeve (100) provides extended utility beyond personalization. It offers minor protection against scratches and scuffs while maintaining a tactile, grippy outer casing (122) for comfortable handling. In certain embodiments, the sleeve (100) may display dynamic notifications, QR codes (174), advertisements, or promotional content directly on its surface, creating commercial or enterprise applications. The same concept may also be scaled to larger devices such as tablets (176), laptops (178), or wearable accessories (180), further extending the applicability of the present disclosure.

[0066] The foregoing descriptions of exemplary embodiments of the present disclosure have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the disclosure to the precise forms disclosed, and obviously many modifications and variations are possible in the light of the above teachings. The exemplary embodiments were chosen and described in order to best explain the principles of the disclosure and its practical application, to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated.

Claims

We claim1. A self-adhesive colour-changing sleeve (100) for a mobile phone (150), comprising: a flexible back panel (102) adhesively attachable to a backside of the phone, the back panel including an electronically controllable bi-stable display (108) capable of displaying different colours or patterns; and a flexible side band (112) removably attachable around a perimeter of the phone, the side band housing electronic components (120) including a control circuit (122) and a power source (128); wherein the back panel (102) and side band (112) are joined via a hidden connector (118) such that the control circuit (122) drives the bi-stable display (108) to change the appearance of the sleeve as per user selection, providing a thin, integrated second-skin that is customizable in situ on the phone; and wherein the back panel (102) and side band (112) include guidelines, templates, or stencils (146) for creating openings corresponding to hardware features of the phone (150) including a camera (152), fingerprint sensor (154), and flash module (156).

2. The sleeve (100) as claimed in claim 1, wherein the back panel’s display (108) comprises a multi-color electrophoretic film laminated between protective layers, such that once a color or pattern is set it is retained without power consumption.

3. The sleeve (100) as claimed in claim 1, wherein the back panel (102) further comprises a reusable adhesive layer (104) on its inner surface, the adhesive being adapted to allow the sleeve to be applied, removed, and reattached multiple times without leaving residue.

4. The sleeve (100) as claimed in claim 1, wherein the side band (112) includes a modular length adjustment feature (114), the side band being provided in excess length and arranged to be trimmed and joined at a seam (116) to fit the perimeter of the phone (150) , enabling the sleeve to be universally fit to different phone models without bespoke manufacturing for each model.

5. The sleeve (100) as claimed in claim 1, wherein the side band (112) and back panel (102) are connected by a concealed overlapping and mirrored opposite connector (118) through which power and data are transferred, the connector being positioned and designed to maintain a uniform external appearance of the sleeve.

6. The sleeve (100) as claimed in claim 1, wherein the control circuit (122) comprises a microcontroller, an NFC transceiver (124), and optionally a Bluetooth Low Energy module (126), adapted so that the sleeve (100) receives wireless instructions from the phone (150) or a companion application (160) to update the display (108).

7. The sleeve (100) as claimed in claim 6, wherein the NFC transceiver (124) is further arranged to harvest energy from the phone’s NFC field, and the bi-stable display (108) consumes power only during updates, thereby enabling the sleeve to operate even with a low or absent internal battery.

8. The sleeve (100) as claimed in claim 1, wherein the electronic components (120) further comprise one or more sensors (132) selected from: a heart rate sensor (134), a galvanic skin response sensor (136), a temperature sensor (138), a motion sensor (140), an ambient light sensor (142), and a touch sensor (144), the control circuit (122) being adapted to adjust the display (108) in response to sensor inputs.

9. The sleeve (100) as claimed in claim 1, wherein the power source comprises a rechargeable micro-battery (128) and a wireless charging receiver (130) adapted to allow recharging without direct electrical contacts.

10. The sleeve (100) as claimed in claim 1, wherein the back panel (102) and side band (112) comprise guide markings or perforations (146) arranged to be cut to accommodate features of the phone (150), including the camera (152), fingerprint sensor (154), flash module (156), and speaker / mi crophone openings (158).

11. The sleeve (100) as claimed in claim 1, wherein an outer surface of the sleeve comprises a protective and aesthetic coating (106) selected from: a transparent hard coat, a matte anti-glare coat, a tactile rubberized layer, or a thin leather / fabric veneer.

12. The sleeve (100) as claimed in claim 1, wherein the combination of universal adaptability, a bi-stable display (108), and an adhesive thin construction provides a customizable accessory that replaces multiple decorative cases.

13. The sleeve (100) as claimed in claim 1, wherein pre-cut modules or perforated punch-out sections (146) are provided for selected phone models, the sleeve material being arranged to be cut cleanly without damaging the electronic functionality.

14. The sleeve (100) as claimed in claim 1, further comprising the mobile phone (150) and a mobile application (160) running on the phone, the application (160) being adapted to communicate with the sleeve via NFC (124) and / or BLE (126) and providing a user interface (162) for selecting appearances, transmitting commands, and monitoring sleeve status.

15. The sleeve (100) as claimed in claim 9, further comprising thin-film solar cells (110) disposed on an outward surface of the sleeve (100) and connected to the power source (128) for trickle charging from ambient light.

16. The sleeve (100) as claimed in claim 13, wherein the sleeve and application are adapted to support outfit matching by reading data from an NFC tag (164) associated with clothing or accessories, and updating the display (108) to a matching or complementary output.

17. The sleeve (100) as claimed in claim 13, wherein multiple phones (150) each fitted with the sleeve (100) are communicatively linked via the application (160) or via BLE (126), enabling a group synchronization mode wherein changes in one sleeve are propagated to others through a communication channel (166).

18. A method of customizing the appearance of a mobile phone (150), the method comprising: providing a self-adhesive colour-changing sleeve (100) comprising a flexible back panel (102) having an electronically controllable bi-stable display (108) and a flexible side band (112) housing electronic components (120);attaching the sleeve (100) to the mobile phone (150) by adhering the back panel (102) to a backside of the mobile phone using a reusable adhesive layer (104); selecting a colour, pattern or image via a mobile application (160) running on the mobile phone (150); transmitting display instructions from the mobile phone (150) to the sleeve (100) via a wireless link selected from near-field communication (NFC) (124) and Bluetooth Low Energy (BLE) (126); and updating the bi-stable display (108) to render the selected colour, pattern or image, wherein the bi-stable display (108) retains the rendered appearance without requiring continuous power.

19. The method as claimed in claim 18, further comprising trimming the sleeve (100) along guide markings (146) to create openings for features of the phone (150), and trimming the side band (112) before joining at a seam (116) to conform to the perimeter.

20. The method as claimed in claim 18, wherein the sleeve (100) automatically updating its display (108) in response to a trigger condition selected from: NFC tag detection (164), sensor input (132), a schedule, or a location-based event.

21. The method as claimed in claim 18, wherein the method comprising synchronizing multiple phones (150) each thereof fitted with the sleeve (100) such that changes in one sleeve are propagated to others via the communication channel (166) for coordinated updates.Date: Oct 03, 2025Neha GoyalIN / PA-4398(Agent of the Applicant)

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