Abstract: Systems and methods of generating a security key for an integrated circuit device include generating a plurality of key bits with a physically unclonable function (PUF) device. The PUF can include a random number generator that can create random bits. The random bits may be stored in a nonvolatile memory. The number of random bits stored in the nonvolatile memory allows for a plurality of challenge and response interactions to obtain a plurality of security keys from the PUF.

Abstract: An optical sensing device is disclosed. The optical sensing device includes a sensing pixel, a driving circuit and a first light shielding layer. The sensing pixel includes a sensing circuit and a sensing element electrically connected to the sensing circuit. The driving circuit is electrically connected to the sensing circuit. The first light shielding layer includes at least one first opening corresponding to the sensing element, and the first light shielding layer is overlapped with the driving circuit in a top-view direction of the optical sensing device.

Abstract: The improved structures of floorboard include a groove located in the underside of the floorboard, and a fixing block having a flange dimensioned to fit into the groove of the floorboard. The fixing block has a bottom portion intended to anchor in the cement foundation. The fixing block can be made to join with an elastic floor frame fastened to the cement floor. The floorboard can be conveniently and economically fastened to the cement foundation in various forms by means of the fixing block which is detachably fastened to the floorboard.