Embodiments of this application provide a data transmission method, a multi-function card, and an electronic device. The multi-function card may work as a SIM card or a memory card by using electrical contacts through time division multiplexing. Data is transmitted between the multi-function card and a processor in the electronic device, so that a function of subscriber identity identification can be implemented, and a storage capacity of the electronic device can be expanded. Storage space expanded in the electronic device may be used to store a picture, audio, a video, and an application program. The data transmission method and the multi-function card provided in embodiments of this application may be used to save physical space in the electronic device. This is conducive to lightening and thinning of the electronic device.

A method for reading an identification tag is provided that includes detecting a content of particles having a first feature amount as a specific feature amount, where the particles are included in the identification tag; and distinguishing a type of the identification tag by information on the content of the particles having the first feature amount.

An authentication method involves comparing a 2D description of an authentication device, referred to as a subsequent description, with an original 2D description by choosing, from several previously established original 2D descriptions, a 2D description established from a point of view similar to the one used to establish the subsequent 2D description. Advantageously, the optical characteristics of the authentication device vary so little when it is viewed from neighboring points of view that the device can be recognized from most of the points of view, and the original 2D descriptions have been established from neighboring points of view, which form a substantially continuous domain. In an improved version, a three-dimensional description of the authentication device, referred to as a 3D description, is reconstructed from several original 2D descriptions, which makes it possible to predict the appearance thereof from a plurality of different points of view.

The disclosed embodiments provide a payment card. The payment card may have a first face and a second face opposite the first. Additionally, the payment card may comprise a first smart chip, the first smart chip having contacts that are electronically accessible from the first face of the card. The payment card may further comprise a first antenna coupled to the first smart chip, the first antenna providing near-field contactless access to the first smart chip and a second smart chip, the second smart chip having contacts that are electronically accessible from the second face of the card. Additionally, the payment card may comprise a second antenna coupled to the second smart chip, the second antenna providing near-field contactless access to the second smart chip and an RF block that electronically isolates the first antenna and the second antenna from each other.

Example embodiments of information-shielding cards and systems and methods of fabricating the same are provided. An information-shielding card can comprising a substrate comprising a first layer, a second layer, a third layer, a chip embedded in the second layer, and a quick-response (QR) code formed on the second layer. The second layer can be disposed between the first layer and the third layer. The first layer can comprise a first material that is transparent when exposed to a non-visible light, the second layer can comprise a second material that is opaque when exposed to visible light and when exposed to non-visible light, and the third layer comprises a third material that is transparent when exposed to a non-visible light.

A non-transitory computer-readable medium stores instructions causing a processor to generate a menu displaying representations of a plurality of cards, the cards having associated card data; receive, from a user input device, a selection corresponding to a selected one of the cards; update the menu to display a representation of the selection; and authorize transmission of the card data associated with the selected card to complete a transaction.

A non-transitory computer-readable medium stores instructions causing a processor to generate a menu displaying representations of a plurality of cards, the cards having associated card data; receive, from a user input device, a selection corresponding to a selected one of the cards; update the menu to display a representation of the selection; and authorize transmission of the card data associated with the selected card to complete a transaction.

A mini smart card and a method of manufacturing the mini smart card are introduced. The method includes disposing bilayered print layers on a top side and a bottom side of a circuit layer, respectively; performing a heat-compression treatment and then a printing treatment on the circuit layer and the bilayered print layers; removing surface layers from the bilayered print layers; and disposing transparent protective layers on the bilayered print layers, respectively. The bilayered print layers are prevented from deforming under the heat generated during the printing treatment. Removal of the surface layers from the bilayered print layers effectively reduces the thickness of the mini smart card.

A structure of a multipurpose card having a semi-transparent or transparent stone is provided. The stone is a faceted precious stone, such as a diamond. The diamond is illuminated from only one side of the multipurpose card and light is passed through predetermined optical paths. An image of the diamond is acquired from the opposite side of the multipurpose card and compared to predetermined reference images of the diamond, to authenticate the multipurpose card.

A pill bottle for prescribed pills includes: a circular top portion having an aperture; a circular bottom portion; walls that form a cylinder and connect the circular top portion with the circular bottom portion; and a pattern of electrically conductive ink disposed on an exterior surface of the walls.