Energy-efficient encoding for HDCP protected digital LCD interfaces

LCD display consumes a significant chunk of energy in various portable devices, which are typically battery operated and support streaming video. Due to the risk of illegal copying of perfect digital uncompressed data travelling on DVI interface, the media industry is fast accepting authentication based content encryption scheme for information requiring protection. This encryption significantly reduces the correlation amongst the data, which has been used to devise low-power encoding to transmit these data over LCD bus. The authors proposed a new low-power encoding scheme to transmit protected digital content which is a trade-off between DC balance offset of a channel and transition count reduction. The authors were able to reduce the transitions on the LCD bus by 28% with insignificant penalty (0.037%) on DC balance of the channel.