Abstract: The present disclosure provides a display substrate, a preparing method thereof, and a display device. The display substrate includes: a base substrate including a spacing region; a plurality of light-emitting device groups on the base substrate, any two adjacent light-emitting device groups of the plurality of light-emitting device groups being spaced apart from each other by the spacing region; and a light-shielding layer on the base substrate. The light-shielding layer covers the plurality of light-emitting device groups and fills the spacing region, a first portion of the light-shielding layer covering the plurality of light-emitting device groups has a first thickness, a second portion of the light-shielding layer filling the spacing region has a second thickness, the first thickness is less than the second thickness.

Abstract: The present invention provides a system, method and apparatus for secure computation on encrypted data that may include a server, a source(s) of encrypted data communicably coupled to the server and a key holder(s) communicably coupled to the server. The server is capable of receiving a request invoking a computation(s) using the encrypted data, requesting a pseudo key(s) for the encrypted data from the key holder(s), obtaining the encrypted data, performing the computation(s) on the encrypted data using the pseudo key(s) and providing the results of the computation(s). The key holder(s) are capable of receiving an encryption key(s) for the encrypted data, receiving the request for the pseudo key(s), computing the pseudo key(s) and providing the pseudo key(s) to the server.