Yoshitami Sakaguchi

Sequential-color LCD based on OCB with an LED backlight

We have fabricated a 13.3-in. XGA (1024 × 768) TFT sequential-color liquid-crystal display using optically compensated birefringency (OCB), illuminated by an LED backlight. We fabricated the sequential-color display feasible process technology, and examined the performance and potential of a field-sequential-color scheme. The display was connected to a laptop computer and examined for flicker.

52.2: Invited Paper: Color Sequential LCD Based on OCB with an LED Backlight

We have fabricated a 13.3″ XGA (1024 by 768) TFT color sequential liquid crystal display using Optically Compensated Birefringency (OCB), illuminated by an LED backlight. We fabricated the color sequential display using mostly feasible process technology, and examined the performance and potential of a color field sequential scheme. The display was connected to a laptop computer and examined for flicker perception.

320‐dpi 4‐inch Reflective Stacked Crossed Guest‐Host Display

We describe a 320-dpi, 4-inch diagonal a-Si:H TFT-driven monochrome reflective display panel, in which two guest-host nematic liquid crystal layers separated by a thin polymer film are orthogonally aligned to realize high reflectivity and high contrast ratio simultaneously. The TFT manufacturer used a four mask process with a high aperture ratio. The structure and characteristics of the panel are presented.

17.5: Rapid‐Response Fluorescent Lamps for Field‐Sequential Full‐Color LCDs

Field-sequential illumination is one of the candidate methods for realizing color-filterless full-color LCDs. The transient characteristics of red, green, and blue fluorescent lamps are investigated, including those of lamps newly developed for this purpose, using several specifically selected phosphors. Conventional red and green phosphor are not fast enough, but blue phosphor and the proposed red ((Sr, Mg)3(PO4)2:Sn2+) and green (Y3(Al, Ga)5O12:Ce3+) phosphors are fast enough.

Structure of a 320-dpi 4-inch a-Si:H TFT Reflective Stacked Crossed Guest-Host Display

We have developed a 320-dpi a-Si:H TFT reflective stacked crossed guest-host display, in which a thin polymer film is used to separate two orthogonally aligned nematic guest-host liquid crystal layers, avoiding parallax and the need to drive the two layers independently. A newly designed pattern of photolithographically defined spacers that hold the thin film in a precise position and the assembly process for the stacked structure are described.

Digital Link: High Functional Digital Monitor Interface

We discuss a high-functional digital monitor interface, called Digital Link, which can support very high resolution monitors, high-level control of monitor functions, and flexible monitor connections. This interface is essentially an upper layer protocol and takes advantages of the physical layer of existing digital interfaces. This paper also describes a prototype system that we have developed to evaluate various aspects of the protocol.

A 320-dpi 4-in. reflective stacked crossed guest-host display

— We describe a 320-dpi, 4-in. diagonal a-Si:H TFT-driven monochrome reflective display panel, in which two guest-host nematic liquid-crystal layers separated by a thin polymer film are orthogonally aligned to realize high reflectivity and high contrast ratio simultaneously. The TFT manufacturer used a four-mask process with a high aperture ratio. The structure and characteristics of the panel are presented.

FULL-COLOR ANALOG TFT-LCD DRIVER

We developed a full-color analog active-matrix LCD (AMLCD) driver (analog source driver) for SVGA and XGA panels. To provide full-color (16.7M-color) display, we designed a new sample/hold circuit that can handle high-speed video signals (up to 25 MHz). To reduce the power consumption, we designed a new control circuit that makes it possible to reuse the charges on the TFT-LCD. The output voltage of the analog source driver is up to 12 volts and, therefore, horizontal/vertical (H/V) inversion driving is supported. We also propose analog current differential signaling that eliminates the problem of electromagnetic interference (EMI) at the video bus between a PC and an AMLCD module.