Exploiting Cross-Channel Correlation for Energy-Efficient LCD Bus Encoding

LCD displays consume a significant portion of the system energy which is a tight constraint for various battery operated portable devices supporting streaming video. With the advent of new LCD technology like Organic-LEDs, and shrinking feature size of I/O controllers, the LCD bus is going to be the major contributor to this power budget for future devices. The data traveling over LCD buses (the images) have high spectral and temporal correlation which can be exploited for reducing the switching activity on the bus. However, there is lack of enough work for exploiting the cross-channel correlation (CCC) for low energy encodings. In this work, we prove the effectiveness of CCC and propose three new algorithms and associated encoding schemes to save as much as 23% switching activity (average 15.5%) and increase the Covering Potential on average by 20% for the LCD bus.