Masahiro Baba

7.3: Advanced Level Adaptive Overdrive (ALAO) Method Applicable to Full HD‐LCTVs

In this paper, we report on the development of an advanced level-adaptive overdrive (ALAO)method applicable to full HD-LCTVs, which not only reduced the gray level response time to less than one fourth, but also improved S/N for still pictures by 10 dB and reduced the circuit cost for the LAO method to almost half that of a conventional LAO circuit. We applied the ALAO method to a full-HDLC projector with 1.84 M pixels and obtained high full-HD motion picture qualities.

LC GRIN lens mode with wide viewing angle for rotatable 2D/3D tablet

To widen the vertical and horizontal angular ranges where the lens performs well, the off-axis performance of a liquid crystal gradient index (LC GRIN) lens is analyzed by the combined simulation system of an LC director simulator and a ray-tracing simulator. We found that the angular difference between an LC alignment direction and an electrode array direction of the LC GRIN lens is one of significant parameters, and detailed conditions of structure are established. The measurement result shows that the developed structure reduces the degradation ratio in a luminance profile from 61% to 3.2%. We have applied a user tracking system for the rotatable 3D display, equipped with a detection of a panel orientation and a face position. As a result, we have developed a rotatable 2D/3D tablet whose 3D viewing azimuth angle is over 30° in both landscape and portrait orientations.

Software-processed edge- and level-adaptive overdrive (SELAO) method for high-quality motion pictures

— In this paper, a software-processed edge- and level-adaptive overdrive (SELAO) method, which is a novel overdrive technique that utilizes not only a temporal change of gray levels but also a spatial edge intensity of motion pictures, is proposed. The SELAO method is a software video-processing technology to improve motion-picture quality rendered on LCDs more than is possible with a conventional SLAO method without edge-adaptive overdrive, and it works in real time on commonly used personal computers (PCs).

HD motion-picture evaluation method for overdrive technology in the frequency domain

— In this paper, the development of an advanced level-adaptive overdrive (A-LAO) method applicable to a full-HD LC projector with 1.84 Mpixels, which reduced the gray-level response time to less than 16 msec, is introduced. In addition, it is shown that a response of less than 8 msec can be achieved by combining the A-LAO method with a frame interpolation method (120-Hz refresh). A new motion-picture evaluation method using frequency-domain analysis, in other words, perceived bandwidth instead of the conventional time-domain-analysis response time evaluation, is reported.

46.3: Software‐Processed Edge‐ and Level‐Adaptive Overdrive (SELAO) Method for High‐Quality Motion Picture

We have developed the software-processed edge- and level-adaptive overdrive (SELAO) method. The SELAO method is a novel overdrive technique that utilizes not only the temporal change of the gray level but also the spatial edge intensity of the motion picture. The SELAO software can work in real time on PCs. Therefore, the SELAO method can improve the motion picture quality of an LCD more than the conventional SLAO method without edge-adaptive overdrive.

55.4: Image Processing‐based Crosstalk Reduction for Stereoscopic Displays with Shutter Glasses

We propose a crosstalk reduction method based on image processing for stereoscopic displays with shuttered glasses. The proposed method precisely evaluates crosstalk caused by not only LCD responses but also backlight leakage and glasses responses. Experimental results show that our method reduces crosstalk by 70% whereas that of a previous work which evaluates only the LCD responses was 65%.

Preserving perceived brightness of displayed image over different illumination conditions

In this paper, we propose an image correction method for preserving a brightness appearance of displayed images under several illumination conditions based on a novel human visual system (HVS) model named as a rod and cone response (RCR) model. The brightness appearance of displayed images changes according to an adaptation of human eyes caused by a surrounding illumination and characteristics of a display device, which is defined as a device model, such as a surface reflectance and a contrast ratio. The proposed method based on the RCR and the device model can predict the brightness appearance more precisely and faster than conventional HVS models such as CIECAM02. Our prototype display device with the proposed method reduces the prediction error by 81% with 12% of a computational cost compared to CIECAM02. The proposed method improves image quality on the display device under any surrounding illumination conditions.

P‐193: EMI Reducing Techniques for Low Voltage Differential Signaling by Applying a Vertically Differential Method and Data Arrangement Optimization

We developed EMI (Electromagnetic Interference) reducing techniques that utilize a Vertically Differential EMI suppression method (VDE) and data arrangement optimization for Low Voltage Differential Signaling (LVDS) transmission lines. This method utilizes the vertical correlation of two adjacent horizontal lines for image data. It enables data signal frequencies below half of clock signal frequency and makes reverse phase between neighboring differential pair lines. The novel technique reduced EMI by 8 dB for a 20.8-inch ultra-high resolution monitor.

P-57: Local Dimming Algorithm to Minimize Maximum Luminance Reproductive Error

In regard to local dimming LCD, we defined a new objective function to evaluate reproducibility both at higher and lower luminance based on human vision characteristics and optical characteristics of backlight and LCP. And we developed a local dimming algorithm that can combine higher luminance reproducibility and low power consumption.

64.1: High Contrast, Low MPRT OCB LCD with Dynamic Backlight Control Technology

We have developed a high performance OCB-III LCDs with dynamic backlight control technology having a high contrast ratio of 1,000,000:1 and a MPRT of 2.0ms with the 32 inch panel. with OCB-III driving, which is suitable for dynamic backlight control, we have realized a high contrast ratio without sacrificing its fast response time.