Recent mobile displays have encountered a turning point in market trends as well as in technology requirements. Mobile displays are rapidly shifting to larger sizes, higher resolution (>300ppi), wider viewing angles, higher contrast, and integration with touch functionality. All of this has caused a generation change in mobile display architecture and technologies. This paper will address those revolutions and Chimei Innolux (CMI)'s approach.
Abstract— A high‐performance reflective‐type TFT‐LCD with full‐color and video‐rate capabilities has been developed. This display utilizes a single‐polarizer geometry associated with a mixed‐mode twisted‐nematic (MTN) effect. The twist angle of the liquid‐crystal cell is optimized by evaluating the light efficiency, contrast ratio, chromaticity, and gray‐shading reproducibility with respect to the variation of cell‐gap uniformity. Attractive features of this display such as low driving voltage, fast response, wide viewing angle, rich gray scales with superior color reproducibility, and clear image with no parallax are demonstrated.
In this paper, we describe a new MVA technology for wider viewing angle. The MVA mode has a color-wash-out issue when the panel is seen from a large viewing angle. In order to solve this, we have optimized a halftone-grayscale method for MVA mode. We have also developed a new pixel structure with an ITO etched pattern on the CF side for transmissive panels. As a result, we have obtained a better viewing angle performance with less color-wash-out.
A reflective TFT-LCD with an internal diffusive micro slant reflector (DMSR) is developed to improve the previous MSR structure [1,2]. The DMSR structure is optimized to obtain a desired light scattering disbribution cone while still preserving the asymmetry characteristics. A 6.4" VGA full-color reflective TFT-LCD with a DMSR is realized. In this paper, we will discuss the optical perperties of the panel. The measurement results show that the reflectance is 42% compared with a Lambertian white standard and the contrast ratio is larger than 20:1.
A high brightness and high contrast reflective LCD with an internal micro slant reflector (MSR) is developed. The internal MSR is used in a single‐polarizer configuration using mixed‐mode twisted nematic (MTN) effect. MSR is effective in boosting the brightness of reflective LCD. The results show contrast ratio more than 30 and response time less than 20ms. In the configuration of a full‐color TFT‐LCD with 60% aperture ratio, reflectivity of 35% is demonstrated.
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