Ayako Takagi

30.3: Autostereoscopic Partial 2-D/3-D Switchable Display Using Liquid-Crystal Gradient Index Lens

We developed 12-inch 9-view autostereoscopic partial 2-D/3-D switchable display using liquid crystal gradient index (GRIN) lens. We simulated optically by the stacked refraction-index distribution model and optimized liquid crystal (LC) material and electrode structure. The prototype achieved wide viewing angle and good 3-D image quality with mosaic color filter and vertical lens.

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.

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-40: EMI Reduction Technique by Differential Data Transmission through Lossless Modulo Coding

We developed EMI (Electromagnetic Interference) reducing techniques which is based on vertically differential EMI suppression method by applying modulo reduction (MVDE) for lossless encoding to low voltage differential signal lines (LVDS). The frequency at peak field strength can be forecasted because the duty ratio of the MVDE signal and transition probability tends to become small. The quality of transmitted signal in MVDE is clarified by measuring the eye pattern of signal transmission. The novel technique reduces EMI by 12 dB for 32-inch high-definition TV monitor in displaying the H-character image.

50.2 Vertically Differential Encoding Method for Low-Power LCD Interface

Based on our original LCD interface technology, the Vertically Differential Encoding (VDE) method for LCD panel interface that reduced the EMI by −15dB [1], we have developed a Color Differential VDE (CD-VDE) with fixed length coding as a low-power LCD interface that can reduce the clock frequency to half without noticeable image degradation. We have reduced the power consumption by 14% for a 14-in LCD with SXGA+ resolution by developing an FPGA with the CD-VDE algorithm.