Jun Someya

Evaluation of liquid-crystal-display motion blur with moving-picture response time and human perception

— The moving-picture response time (MPRT) for measuring liquid-crystal-display (LCD) motion blur was studied by several organizations in 2001. To determine the LCD motion blur that humans perceive, subjective evaluation experiments using the method of adjustment was conducted to find a strong correlation between perceived motion blur and extended blurred edge time (EBET) of the MPRT measurements. MPRT thus clearly indicates the degree of which humans perceive motion blur.

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.

A 65-in. slim (255-mm depth) laser TV with wide-angle projection optical system

— A high-definition laser TV that employs a newly developed laser light source and a super-wide-angle projection optical system has been developed. This adoption of a laser light source with three primary colors helped to achieve an extremely wide color gamut, and, in addition, a compact optical engine, which has been optimized to the laser light source and contributed to the achievement of the stylish design of a large screen of 65 in., with the depth being only 255 mm.

19.3: Correlation between Perceived Motion Blur and MPRT Measurement

The MPRT has been studied as the method of measuring motion blur on LCD. Subjective evaluation was conducted using the method of adjustment for investigating perceived motion blur. As a result, a strong correlativity was found between the perceived motion blur and the measurements by MPRT. So the MPRT can indicate very well the degree of motion blur perceived by humans.

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.

56.3: 65-inch, Super Slim, Laser TV with Newly Developed Laser Light Sources

A new light source for laser TVs has been developed along with a 65-inch super slim laser TV that employs the light source. In this stylish laser TV set, a depth of 255 mm has been realized owing to the new laser light source, a compact optical engine and a small laser drive power supply which are optimized to the light source.

19.3: Laser TV: Ultra‐Wide Gamut for a New Extended Color‐Space Standard, xvYCC

We have developed an HDTV that adopts semiconductor lasers involving three primary colors, red, green and blue for the light source. The adoption of a laser light source helped us realize a HDTV with a dramatically wide color gamut, namely 190% the color gamut of ITR-U BT.709. In addition, we have also developed an LSI that can deal with an extended color space xvYCC, which is a new international standard, and mounted the LSI in the HDTV. The display of colorful and natural video pictures has been achieved through the effective use of the wide color gamut involved in the laser light source supported by a video signal processing circuit that complies with the xvYCC standard and Natural Color Matrix, a color management technique.

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.