Abstract: An display device may include a substrate including an active area and an inactive area surrounding the active area, a plurality of thin film transistors disposed in the active area, each of the thin film transistor including a semiconductor layer and a first electrode, a light emitting elements disposed in the active area, each of the light emitting element including an anode electrode and an organic light emitting layer, a connection area and a peripheral area disposed in the inactive area, and a first reflective electrode disposed in the connection area.

Abstract: A method for storing transaction history data is provided. The method includes steps of: (a) a business processing server creating or supporting to create index data regarding a start of a transaction if the transaction starts; (b) the business processing server creating or supporting to create trace data related to processing individual services of the transaction; and (c) the business processing server creating or supporting to create index data regarding an end of the transaction if the transaction ends; wherein the business processing server stores or supports to store the index data regarding the start of the transaction and the index data regarding the end of the transaction in a database and the trace data related to processing the individual services of the transaction in a separate file system.