Wireless active display contact lens with privacy and confidentiality and preparation method thereof

Abstract

The present invention discloses a wireless active display contact lens with privacy and confidentiality and a preparation method thereof. The contact lens includes a privacy optical layer, a wireless transmission circuit and a light-emitting layer, and a focusing optical layer, and is finally wrapped and packaged with contact lens raw materials. The privacy optical layer is inspired by the pinhole imaging principle, and a hole structure is made on an opaque film by laser ablation. According to the pinhole imaging principle, the external image can be imaged onto the retina through the pinhole, but the display content inside the contact lens cannot be completely transmitted to the outside through the pinhole, thereby achieving the goal of displaying content only to the wearer without blocking the line of sight. The focusing light-emitting layer is a photolithographic Fresnel lens that assists in focusing the light emitted by the LED onto the retina to enhance the display effect. The wireless active display contact lens with privacy and confidentiality of the present invention meets the characteristics of high resolution, privacy and confidentiality, and high comfort, and has applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of contact lenses, and in particular to a wireless active display contact lens with privacy and confidentiality and a special orientation method thereof. Background Art

[0002] Smart devices typically have a variety of sensors and primary display devices. Existing display devices have evolved from simple 7-segment monochrome LEDs in early mobile circuits to current color, high-resolution displays that can display complex flat graphics. Among them, smart contact lenses, which can display information without requiring hand-held contact lenses, are the most promising future mainstream personal wearable display devices. In response to the needs of augmented reality (AR), virtual reality (VR), and mixed reality (MR), smart contact lenses (SCLs) provide a new way to manage information and interact with the world, and have become an important platform for the future consumer market. At the same time, relying on the compactness and lightness of contact lenses, overlaying computer-generated visual information on the real world and providing instant access to information also poses a challenge to researchers.

[0003] As contact lens-based biosensors develop, some contact lenses even combine glucose sensors with individual LED display pixels to provide an instant display of glucose concentration levels. With more colors and higher resolution, contact lenses can display text for use with gaming devices or to provide prompts from navigation systems.

[0004] Among them, wireless power transmission and the use of wireless methods to control LED display arrays to display specific information and graphics have attracted much attention. However, this technology involves transparent information transmission. For the fields of visual encryption and data encryption, there is an urgent need for wearable wireless active display contact lenses with high resolution, privacy, confidentiality, and high comfort. Summary of the Invention

[0005] Purpose of the invention: In view of the fact that current active display devices cannot meet the urgent need for privacy and confidentiality transmission, the present invention is inspired by the principle of pinhole imaging to provide a wireless active display contact lens with privacy and confidentiality and a preparation method thereof.

[0006] Technical solution: The present invention provides a wireless active display contact lens with privacy and confidentiality. The contact lens adopts a layered structure, including a privacy optical layer, a wireless transmission circuit and a light-emitting layer, and a focusing optical layer arranged in sequence;

[0007] The privacy optical layer is provided with a hole; when the contact lens is worn, the position of the hole corresponds to the position of the pupil;

[0008] The wireless transmission circuit and the light-emitting layer include an antenna, a control chip, an LED array and a conductive link; the antenna is connected to the control chip, and the LED array is connected to the control chip through a conductive link; the area where the LED array is located corresponds to the area where the hole is located.

[0009] The antenna is used to receive external radio frequency energy and signals, power the control chip and LED array, and transmit external signals to the control chip, thereby controlling the LED display array through the control chip. The antenna is annular, with a diameter larger than the pupil diameter, and the material used for the antenna is metal, such as gold.

[0010] The focusing optical layer is used to focus the light emitted by the LED.

[0011] In order to simultaneously meet the goals of wearing comfort, biocompatibility, wireless energy transmission and adjustable display function, the overall thickness of the contact lens of the present invention does not exceed 200um, and the thickness of the LED array is less than 30um.

[0012] Furthermore, the control chip includes a radio frequency module, a power management module and an LED control module;

[0013] The RF module is connected to the antenna and is used to collect RF signals from the antenna and send the decoded RF data to the LED control module;

[0014] The power supply module includes a rectifier, which is used to convert the radio frequency energy collected by the antenna into a voltage signal that can be used by the radio frequency module and the LED control module.

[0015] The LED control module is connected to the LED array. The LED array is a Micro-LED array;

[0016] Furthermore, the focusing optical layer includes a photolithographic Fresnel lens, and the region where the photolithographic Fresnel lens is located corresponds to the LED array, and is used to focus the light emitted by the LED array.

[0017] Based on the wireless active display contact lens with privacy and confidentiality of the present invention, a method for preparing the contact lens is proposed, comprising the following steps:

[0018] Step 1: preparing a wireless transmission circuit and a light-emitting layer;

[0019] Step 1.1, preparing an LED array;

[0020] Step 1.2, prepare the antenna and conductive link; connect the control chip to the antenna, and connect the control chip conductive link to the LED array;

[0021] Step 2, preparing a focused light-emitting layer;

[0022] A Fresnel lens is prepared on a transparent PET to form a pattern of a metal ring array, wherein each metal ring in the metal ring array is a Fresnel lens;

[0023] Step 3: Fix the Fresnel lens on the back of the LED. Each Fresnel lens is positioned corresponding to one LED.

[0024] Step 4: Place the wireless transmission circuit, the light-emitting layer, and the focusing light-emitting layer into a contact lens concave mold, add contact lens raw materials, and form an intermediate component;

[0025] Step 5: Prepare a privacy optical layer and place the privacy optical layer on the outer surface of the intermediate component.

[0026] Furthermore, in step 1.1, an LED array is prepared as follows: the LED array is a micro-LED array, and the LED wafer is directly cut into a micron-level micro-LED 5×3 array using miniaturization process technology; the metal ring array in step 2 is also a 5×3 array.

[0027] Furthermore, in step 1.2, the antenna and conductive link are prepared, the control chip is connected to the antenna, and the conductive link of the control chip is connected to the LED array. The specific steps are as follows:

[0028] Prepare a SiO2 / metal substrate, spin-coat copper as a sacrificial layer, deposit parylene as the base structure and insulating layer, the thickness of parylene is about 4 μm, and coat gold as a conductive layer. Perform the first photolithography to photolithography the conductive layer to form a conductive link and antenna.

[0029] Depositing parylene again as a deposition layer to cover the conductive links, performing a second photolithography process to etch the deposition layer, placing the LED array in place, connecting the LED array to the conductive links, and forming a display substrate;

[0030] Laser heating technology is used to plate the LED array on the conductive link, and parylene is deposited again to cover the LED;

[0031] The third photolithography step exposes the contact window for the control chip and uses a copper etchant to etch the copper sacrificial layer; this connects the control chip to the conductive link and antenna of the display substrate.

[0032] Furthermore, in step 5, a privacy optical layer is prepared, which is an opaque flexible film and is non-conductive to avoid affecting wireless transmission; and the privacy optical layer is set on the outer surface of the intermediate component, and the steps are as follows: a hole structure is made at the center of the opaque flexible film, and the hole area corresponds to the area where the LED array is located and can cover the area where the LED array is located, and then the privacy optical layer is embedded in the outer layer of the contact lens.

[0033] Beneficial effects: Compared with the prior art, the present invention has the following significant features:

[0034] 1. A contact lens with an opaque film with a laser-ablated hole structure has been designed to protect display content and increase data reliability. It has great development potential in the future fields of visual encryption and game display.

[0035] 2. Designed a circuit-driven LED display system that uses antennas for wireless power and data transmission. Two frequency antennas were designed to improve efficiency. Wireless commands can be sent to display specific information or graphics, enabling real-time control of the Micro-LED array. The flexible hybrid system board used is lightweight, highly transparent, and wearable.

[0036] 3. A Fresnel lens is designed to enhance the display effect. Since the minimum focal length of the human eye is a few centimeters and it is impossible to distinguish objects on the contact lens, an auxiliary lens is designed to focus the light emitted by the LED to enhance the display effect.

[0037] 4. The present invention proposes a method for preparing the smart contact lens. The method takes into account the packaging needs of the circuit system, packages the circuit system, protects the circuit system, and improves the service life of the smart contact lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 1 is a schematic structural diagram of a contact lens of the present invention;

[0039] Figure 2 It is a component of the wireless transmission line and light-emitting layer of the present invention;

[0040] Figure 3 is a schematic diagram of a Fresnel lens of the present invention;

[0041] 1. Antenna; 2. Control chip; 3. Conductive link; 4. LED array. DETAILED DESCRIPTION

[0042] The present invention provides a wireless active display contact lens with privacy and confidentiality. The contact lens adopts a layered structure design, which comprises a privacy optical layer, a wireless transmission circuit and a light-emitting layer, and a focusing optical layer from the outside to the inside; the inside refers to the pupil side after the contact lens is worn.

[0043] The privacy optical layer is inspired by the pinhole imaging principle and uses electrochemical methods or laser ablation to produce a hole structure on an opaque film. According to the pinhole imaging principle, the external image can be imaged onto the retina through the pinhole, but the display content inside the contact lens cannot be completely transmitted to the outside through the pinhole, thereby achieving the goal of not blocking the line of sight while only displaying content to the wearer.

[0044] The wireless transmission circuit and light-emitting layer include an antenna 1, a control chip 2, an LED array 4 and a conductive link 3;

[0045] The antenna 1 is connected to the control chip 2, and the LED array 4 is connected to the control chip 2 via a conductive link 3;

[0046] Antenna 1 uses 920MHz RFID technology as the energy source for wireless power supply and data transmission, and transmits display commands to control chip 2 via the RFID protocol. The control chip 2 can instantly control the micro-LED display array to display different contents.

[0047] The control chip 2 includes a radio frequency module, a power management module and an LED control module;

[0048] The RF module is connected to antenna 1 and is used to collect RF signals from antenna 1, convert them into baseband signals and demodulate the data information. The data information after RF decoding is sent to the LED control module, which controls the lighting of the LED.

[0049] The power module includes a rectifier, which converts the radio frequency energy collected by the antenna 1 into a voltage signal that can be used by the radio frequency module and the LED control module.

[0050] The LED control module includes a microprocessor and a driver circuit. The microprocessor processes the digital signal decoded from the RF module, and the output of the microcontroller is connected to the LED driver circuit to control each LED to light up.

[0051] LED array 4 is a Micro-LED array. The array is 5×3, with individual Micro-LEDs measuring 100µm (W) × 150µm (L) × 30µm (H). Conductive link 3 connects control chip 2 and LED array 4. Designing antenna 1 and LEDs on the same layer reduces the thickness of the circuit layer, further enhancing wearer comfort.

[0052] The focusing optical layer uses a photolithographic Fresnel lens to assist in focusing the light emitted by the LED onto the retina, thereby enhancing the display effect.

[0053] The method for preparing a wireless active display contact lens with privacy and confidentiality of the present invention comprises the following steps:

[0054] Step 1: Prepare wireless transmission circuit and light-emitting layer.

[0055] Step 1.1, prepare LED array

[0056] The LED array 4 is a micro-LED array. Using miniaturization process technology, the LED wafer is directly cut into a micron-level micro-LED 5×3 array with a size of 100um (W)×150um (L)×30um (H).

[0057] Step 1.2: Prepare antenna 1 and conductive link 3

[0058] Prepare a SiO2 / metal substrate, spin-coat copper as a sacrificial layer, deposit parylene as a base structure and insulating layer, coat gold as a conductive layer, perform the first photolithography, photolithography the conductive layer, and form a conductive link 3 and antenna 1;

[0059] Deposit parylene again as a deposition layer to cover the conductive links 3, perform a second photolithography process to etch the deposition layer, place the LED array 4, and connect the LED array 4 to the conductive links 3 to form a display substrate;

[0060] Laser heating technology is used to plate the LED array 4 on the conductive link 3. In order to strengthen the structure and prevent the LED from falling off, parylene is deposited again to cover the LED;

[0061] The third photolithography step exposes the contact window of the control chip 2 and uses a copper etchant to etch the copper sacrificial layer. The control chip 2 is connected to the conductive link 3 of the display substrate and the antenna 1 using a flip-chip bonding method.

[0062] Step 2: Prepare a focused light-emitting layer. Electron beam lithography (EBL) is used to prepare a Fresnel lens on a transparent PET substrate to form a pattern of an opaque 5×3 array of metal rings. Each metal ring pattern is a Fresnel lens, and the position of each Fresnel lens corresponds to an LED.

[0063] Step 3: Using microelectronics, a Fresnel lens is attached to the back of the LED. The light emitted by the LED is re-imaged through the Fresnel lens, enhancing the display effect.

[0064] Step 4: Place the entire wireless transmission circuit, the light-emitting layer, and the focused light-emitting layer into a contact lens concave mold, add contact lens raw materials, cover with a convex mold, and heat and solidify.

[0065] Step 5: Prepare a privacy optical layer, which is an opaque flexible film. A hole structure is made in the center of the opaque flexible film by laser etching. The hole area corresponds to the area where the LED array 4 is located and can cover the area where the LED array 4 is located. Then, use microelectronic technology to embed the privacy optical layer in the outer layer of the contact lens.

Claims

1. Wireless active display contact lenses with privacy protection, characterized in that: The contact lens adopts a layered structure, including a privacy optical layer, a wireless transmission circuit and a light-emitting layer, and a focusing optical layer arranged in sequence; The privacy optical layer is provided with holes. According to the pinhole imaging principle, the external image is imaged onto the retina through the holes, but the display content inside the contact lens cannot be fully transmitted to the outside world through the pinholes. The wireless transmission circuit and the light-emitting layer include an antenna, a control chip, an LED array, and a conductive link; the antenna is connected to the control chip, and the LED array is connected to the control chip via a conductive link; the area where the LED array is located corresponds to the area where the hole is located; The focusing optical layer is used to focus the light emitted by the LED.

2. The wireless active display contact lens with privacy protection according to claim 1, characterized in that: The control chip includes a radio frequency module, a power management module and an LED control module; The RF module is connected to the antenna and is used to collect RF signals from the antenna and send the decoded RF data to the LED control module; The power module includes a rectifier, which is used to convert the radio frequency energy collected by the antenna into a voltage signal for the radio frequency module and the LED control module to operate. The LED control module is connected to the LED array.

3. The wireless active display contact lens with privacy protection according to claim 1, characterized in that: The LED array is a Micro-LED array.

4. The wireless active display contact lens with privacy protection according to claim 1, characterized in that: The focusing optical layer includes a photolithography Fresnel lens. The area where the photolithography Fresnel lens is located corresponds to the LED array and is used to focus the light emitted by the LED array.

5. A method for preparing a contact lens as claimed in claim 1, characterized in that: The steps include: Step 1: preparing a wireless transmission circuit and a light-emitting layer; Step 1.1, preparing an LED array; Step 1.2, prepare the antenna and conductive link; connect the control chip to the antenna, and connect the control chip conductive link to the LED array; Step 2, preparing a focused light-emitting layer; A Fresnel lens is prepared on a transparent PET to form a pattern of a metal ring array, wherein each metal ring in the metal ring array is a Fresnel lens; Step 3: Fix the Fresnel lens on the back of the LED. Each Fresnel lens is positioned corresponding to one LED. Step 4: Place the wireless transmission circuit, the light-emitting layer, and the focusing light-emitting layer into a contact lens concave mold, add contact lens raw materials, and form an intermediate component; Step 5: Prepare a privacy optical layer and place the privacy optical layer on the outer surface of the intermediate component.

6. The method for preparing contact lenses according to claim 5, wherein: Prepare the LED array in step 1.1 as follows: The LED array is a micro-led array, which uses miniaturization process technology to directly cut the LED wafer into a micron-level micro-led 5×3 array.

7. The method for preparing contact lenses according to claim 5, wherein: Prepare the antenna and conductive link in step 1.2, connect the control chip to the antenna, and connect the control chip conductive link to the LED array. The specific steps are as follows: Prepare a SiO2 / metal substrate, spin-coat copper as a sacrificial layer, deposit parylene as a base structure and insulating layer, apply gold as a conductive layer, perform the first photolithography, photolithography the conductive layer, and form conductive links and antennas; Depositing parylene again as a deposition layer to cover the conductive links, performing a second photolithography process to etch the deposition layer, placing the LED array in place, connecting the LED array to the conductive links, and forming a display substrate; Laser heating technology is used to plate the LED array on the conductive link, and parylene is deposited again to cover the LED; The third photolithography step exposes the contact window for the control chip and uses a copper etchant to etch the copper sacrificial layer; this connects the control chip to the conductive link and antenna of the display substrate.

8. The method for preparing contact lenses according to claim 6, wherein: In step 2, the metal ring array is a 5×3 array.

9. The method for preparing contact lenses according to claim 5, wherein: In step 5, a privacy optical layer is prepared and disposed on the outer surface of the intermediate member, as follows: The privacy optical layer is an opaque flexible film, and a hole structure is made at the center of the opaque flexible film. The hole area corresponds to the area where the LED array is located and can cover the area where the LED array is located. Then the privacy optical layer is embedded in the outer layer of the contact lens.

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