Apparatus and method thereof

An apparatus for mode detection for a display device includes a front-end circuit, adapted to fetch an image signal according to a determined mode to generate a fetched image signal, and to adjust the determined mode according to a control signal, and a back-end circuit, connected to the front-end circuit, adapted to process the fetched image signal according to the determined mode. The back-end circuit is adapted to generate an indication signal according to an abnormal status, wherein the back-end circuit comprises a buffer adapted to temporarily store the fetched image signal, and wherein the abnormal status comprises an underflow or overflow state of the buffer. The back-end circuit further includes a determining unit, connected to the front-end circuit and the back-end circuit, adapted to generate the control signal according to the indication signal indicating the determined mode needs to adjust.