A novel pixel memory using integrated voltage‐loss‐compensation (VLC) circuit for ultra‐low‐power TFT‐LCDs |
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Authors: | Yoshimitsu Yamauchi Naoki Ueda Yasuyuki Ogawa Kohei Tanaka Keiichi Yamamoto |
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Affiliation: | Sharp Corp., Corporate Research and Development Center, Display Device Laboratories, Research Dept. 2, 2613‐1, Ichinomot‐cho, Tenri, Nara 632‐8567, Japan |
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Abstract: | Abstract— A novel pixel memory using an integrated voltage‐loss‐compensation (VLC) circuit has been proposed for ultra‐low‐power TFT‐LCDs, which can increase the number of gray‐scale levels for a single subpixel using an analog voltage gray‐scale technique. The new pixel with a VLC circuit is integrated under a small reflective electrode in a high‐transmissive aperture‐ratio (39%) 3.17‐in. HVGA transflective panel by using a standard low‐temperature‐polysilicon process based on 1.5‐μm rules. No additional process steps are required. The VLC circuit in each pixel enables simultaneous refresh with a very small change in voltage, resulting in a two‐orders‐of‐magnitude reduction in circuit power for a 64‐color image display. The advanced transflective TFT‐LCD using the newly proposed pixel can display high‐quality multi‐color images anytime and anywhere, due to its low power consumption and good outdoor readability. |
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Keywords: | Low power pixel memory VLC (voltage loss compensation) analog voltage gray scale advanced transflective TFT‐LCD |
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