Noritaka Okuda

48‐2: A new LCD‐Controller for Improvement of Response Time by Compression FFD

We have developed a new LCD controller incorporating a Compression Feedforward Driving, which will be second generation Feedforward Driving. In spite of having only one SDRAM, this LCD controller can offer nearly ideal performance, improving the response time through utilizing image compression technology to reduce the frame memory requirement.

Motion adaptive CODEC Feedforward Driving for LCD overdrive

— The authors have been developing a Feedforward Driving scheme as an overdrive technique to improve LCD response time. Focusing on the reduction of frame memory in overdrive in particular, they are now studying a memory-reduction method by applying an image-compression technique. An LSI has already been developed that incorporates a Compression Feedforward Driving unit, which successfully reduced image data to 1/3 by means of the image-compression technique. This paper reports a study of Motion Adaptive CODEC Feedforward Driving in which a motion adaptation process is added to the CODEC section of the Compression Feedforward Driving unit. This motion adaptation process reduces the amount of errors in overdrive that are caused by memory reduction by using a circuit of the same scale as that for Compression Feedforward Driving.

33.2: Development of Single Chip Overdrive LSI with Embedded Frame Memory

Methods of reducing overdrive memory using fixed block truncation coding (FBTC) have been studied since 2002, and the effects have been described from time to time. To date, our study has developed a timing controller for liquid crystal panels (TCON), and located in this panel, are a compression feedforward driving (cFFD) unit, which constitutes the basic structure, and a motion adaptive CODEC feedforward driving (macFFD) unit, which switches the structure according to the motion. Both driving units are available for the overdrive of 1/3 compressed images. Further in 2006, we proposed a high compression feedforward driving (hcFFD) algorithm for 1/6 compressed image overdrive. This paper reports the technology of hcFFD integrated into a single LSI, in which the performance has been improved and the circuit has been simplified through a review of the algorithm.

7.4L: Late-News Paper: Reduction of Memory Capacity in Feedforward Driving by Image Compression

The algorithm to reduce the memory capacity in FFD (Feedforward Driving) is discussed. FFD improves the motion video on LCD. The application of image compression technology achieves approximately one tenth-order reduction of memory capacity.

60.2: Dynamic Bit‐Rate Allocation of High‐Compression Feedforward Driving

We have developed High Compression Feedforward Driving (hcFFD) that can compress the image data stored in the frame memory of overdrive down to 1/6. Together with the optimization of the encoding parameters of macFFD, which belongs to the previous generation, this hcFFD technique corrects the response time of liquid crystal with smaller and less memory by means of a system that dynamically controls the bit rate allocated to the luminance signal and the color signal. This 1/6 reduction of image data allows us to structure a memory interface with a 16-bit data bus even on high-definition LCD panels, ensuring both low cost and secured performance.

LP-13: Late-News Poster: A Study of Motion Adaptive CODEC Feedforward Driving without SDRAM

Authors have been engaged in the development of a feed forward driving technique, as part of the overdrive technique to improve the response time of liquid crystal displays. They have developed, in particular, a compression feed forward driving system in which an image compression technique was applied, focusing on a method of reducing the frame memory necessary for the signal processing of overdrives. Further, they are now studying motion adaptive CODEC feed forward driving that reduces the amount of overdrive errors by adding a motion-adaptive process to the image decoding section in cFFD. This paper discusses macFFD that does not use SDRAM as the overdrive for entry model LCD TVs. Setting the image compression ratio to 1/10 or so will enable the fabrication of frame memory for overdrive for SDTV using SRAM.