We have developed a super-fast response OCB (Optically self-Compensated Birefringence) mode TFT-LCD by using capacitively coupled driving method (CC driving method). Response time with this driving method has been improved by the twice or more compared with that of a conventionally driven TFT-LCD. Even at a low temperature, 0 degree, this panel can response within one field time, 16.7 ms, between every gray scale levels. We developed a prototype OCB mode LCD with newly designed compensation films, that achieved a wide viewing angle characteristic of 160 degrees horizontally and 140 degrees vertically under the condition of that the contrast ratio exceeds 10:1.

We have manufactured a trial 'Digital Packet Video (PV) Link' system for super high-resolution display. 'Digital PV Link' is a new data transmission protocol where the host transfers video data with attributes for only a selected area such as a motion picture window. This protocol handles the video data with an ID, which can be used for handling between plural hosts and plural displays such as multi display. This ID also makes the display to handle plural windows in accordance with different parameter such as scaling factor, color-adjust, and so on. In this protocol, error handling is a key because the video data is transferred only when the host wants to change display data. So, we have examined transmission errors and capability for motion pictures by using this trial system. In this report, we will introduce the concept and the characteristics of 'Digital PV Link,' and the result of examination.

The optical structure of a conventional backlight illumination system used for transmissive LCD of a mobile terminal is investigated. A structured LGP based on the total internal reflection is designed and fabricated. The LGP is characterized by optical micro-deflectors (MD) and micro-reflectors (MR). The guided light inside the LGP is reflected on the MR elements and directed toward the MD elements. The coming light ray is refracted on the MD element and as a result the ray is deflected on the LGP. The emergent light on the LGP has a wide zenith angle due to the LGP surface normal. A prism sheet whose function is based on the total internal reflection is set on the LGP. The emanated light from the LGP is reflected on the surface of the prism structure and redirected toward the surface normal. The illumination cone of the novel backlight is limited to horizontal range of 17 degrees and vertical range of 11 degrees. The illumination cone on the novel structure can be shaped by optical designs of the MD and MR elements. The peak brightness on the novel backlight structure is 1.44 times that of the conventional one. In this backlight structure, only one TIR prism sheet is used and a thickness reduction of about 250 µm is achieved.

The design of an electron gun was examined from the viewpoints of pre-focus lens, main lens, corner focus and cathode current. Accordingly, multi-beam electron gun has been developed to catch up with the remarkable progress of resolution in computer peripheral devices such as digital still cameras and video boards. Multi-beam electron gun has two slot beam apertures of G1 for one cathode, and a key point of its design is to realize two-beam simultaneous convergence and focusing. To satisfy this condition, the divergence angles of electron beam bundles were designed. With this multi-beam electron gun that is superior in both of beam spot size and drive voltage, the 5 million pixels CRT could be realized.

A new ramped-square sustain waveform is proposed to improve both the luminance and the luminous efficiency of an alternate current plasma display panel (ac PDP). The luminous characteristics such as the luminance and luminous efficiency have been measured with a square-voltage and a ramp-voltage (or voltage slope) of the proposed sustain pulse. With an increase in the square-voltage of a ramped-square sustain waveform, the luminance increases but the luminous efficiency decreases. On the other hand, with an increase in the ramp-voltage of a ramped-square sustain waveform, both the luminance and the luminous efficiency increase. When compared with the conventional square sustain waveform, an improved luminance of 22% and luminous efficiency of 36% are simultaneously obtained based on the proper adjustment of the square-voltage and ramp-voltage of the ramped-square sustain waveform in a 4-inch ac PDP test panel at a frequency of 62 kHz.

A plasma display panel (PDP) represents gray levels by the pulse number modulation technique that results in undesirable dynamic false contours on moving images. Among the various techniques proposed for the reduction of dynamic false contours, the optimization of the subfield pattern can be most easily implemented without the need for any additional dedicated hardware or software. In this paper, a systematic method for selecting the optimum subfield pattern is presented. In the proposed method, a subfield pattern that minimizes the quantitative measure of the dynamic false contour on the predefined test image is selected as the optimum pattern. The selection is made by repetitive calculations based on a genetic algorithm. Quantitative measure of the dynamic false contour calculated by simulation on the test image serves as a criterion for minimization by the genetic algorithm. In order to utilize the genetic algorithm, a structure of a string is proposed to satisfy the requirements for the subfield pattern. Also, three genetic operators for optimization, reproduction, crossover, and mutation, are specially designed for the selection of the optimum subfield pattern.

Reactive sputtering of a metallic target in DC planar magnetron discharge shows a drastic mode transition between metallic and oxide modes. To describe the experimental results quantitatively, a new reactive sputtering model including the secondary electron emission coefficient of a target has been developed. The model is based on a simple reactive gas balance model proposed by Berg et al., and can quantitatively describe experimental results such as the oxygen flow rate dependence of deposition rate and discharge, observed for MgO sputter-deposition.

A priming effect is studied for a three-electrode, surface-discharge AC-PDP, which has stripe barrier ribs of 0.22 mm pitch. It was found that by keeping the interval between the reset and address pulses within 24 µs, the data pulse voltage can be reduced while the data pulse width can be narrowed due to the priming effect. By adopting the primed addressing technique to the PDP, the data pulse voltage was reduced to 20 V when the data and scan pulse widths were 1 µs. Alternatively, the data pulse width could be narrowed to 0.33 µs when the data pulse voltage was 56 V. 69% of the TV field time could be assigned for the display periods with 12 sub-fields, assuring high luminance display.

In this work, using 0.2 µm GaAs modulation doped FET (MODFET), a high performance downconverter MMIC was developed for direct broadcasting satellite (DBS) applications. The downconverter MMIC showed a noise figure of 4.3 dB which is lower by 5 dB than conventional ones, and required only a low LO power of -10 dBm for normal DBS operation. At a low LO power of -10 dBm, the power consumption was 175 mW, which is lower than 50 percent of conventional ones. The frequency response of conversion gain exhibited a low gain ripple of 0.9 dB, and the LO leakage power was suppressed to a lower value than -30 dBm under a LO input power of -10 dBm. The fabricated chip exhibited a small size of 0.840.9 mm². The objectives of this work are to improve the traditional direct broadcasting satellite (DBS) downconverters by an efficient circuit design and to describe the techniques employed in the design.

Turbo coding is widely known as one of effective error control coding techniques in various digital communication systems since this coding method has proposed by C. Berrou, etc in 1993. In digital magnetic recording, it has been cleared that the error correcting capability of turbo coding is superior to most of conventional recording codes as a matter of course. But, the performance of a partial response maximum-likelihood (PRML) system combined with any recording code is degraded by many undesirable factors or effects. To improve the performance of the PRML system in high areal density recording, it is useful to adopt a higher order PRML system or high rate code in a general case. In this paper, the rate 32/34 turbo code combined with an enhanced extended class-4 partial response (E²PR4) is proposed. We call this trellis coded partial response (TCPR) system the rate 32/34 turbo-coded E²PR4 (32/34 TC-E²PR4). Our proposed TCPR system can be expected to get large coding gain and improve the performance of PRML system. As a result, the proposed coding system provides a good performance compared with the conventional systems. In especial, our system can achieve a BER of 10^-5 with SNR of approximately 1.5 dB less than the conventional 8/9 maximum transition run (MTR) coded E²PR4ML system at a normalized linear density of 3.

A multiport representation of the step junction of two circular dielectric waveguides of different size is given. Continuous spectral modes of the circular dielectric waveguide are discretized at a terminal plane by means of expressing their mode amplitudes in the form of infinite series of orthonormal Gaussian Laguerre function. Applying the mode matching technique, a multiport representation of the step junction is derived. Numerical examples are given where the results are tested for the conservation of power. Also the numerical results are compared with those from Marcuse's approximate methods.