Abstract: A backlight control device adapted to control a plurality of backlight sources is provided. The backlight control device includes a timing control circuitry and a local-dimming control circuitry. The timing control circuitry is configured to generate a transmission packet according to a first customized content specification, where the transmission packet includes control information and brightness information. The timing control circuitry includes a differential circuit, where the differential circuit is configured to transmit the transmission packet according to a differential voltage level. The local-dimming control circuitry includes a receiving circuit electrically coupled to the differential circuit. The receiving circuit is configured to receive the transmission packet. The local-dimming control circuitry is configured to transmit a light source control signal according to the control information and the brightness information.

Abstract: A control signal transmission circuit and a control signal receiving circuit for an audio/video interface are provided. The control signal transmission circuit includes an audio/video interface encoder, a signal packaging circuit and a data allocator. The audio/video interface encoder is configured to receive an audio packet and supports a user-defined packet format. The signal packaging circuit is configured to receive a first control signal and package the first control signal into a control data packet according to the user-defined packet format. The data allocator is configured to receive a video data and a second control signal and to mix the second control signal and the video data to generate a mixed data packet. The audio/video interface encoder packages the control data packet, the mixed data packet and the audio packet according to an audio/video transmission protocol to generate an audio/video and control data.

Abstract: A control signal transmission circuit and a control signal receiving circuit for an audio/video interface are provided. The control signal transmission circuit includes an audio/video interface encoder, a signal packaging circuit and a data allocator. The audio/video interface encoder is configured to receive an audio packet and supports a user-defined packet format. The signal packaging circuit is configured to receive a first control signal and package the first control signal into a control data packet according to the user-defined packet format. The data allocator is configured to receive a video data and a second control signal and to mix the second control signal and the video data to generate a mixed data packet. The audio/video interface encoder packages the control data packet, the mixed data packet and the audio packet according to an audio/video transmission protocol to generate an audio/video and control data.