A new low‐power driving method for high‐resolution mobile IPS LCDs |
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| Authors: | Naoki Takada Norio Mamba Takuya Eriguchi Yasuyuki Kudo Yoshihiro Kotani Masahiro Maki Hideo Satou Shouji Nagao Shinichi Iwasaki Shinya Hashimoto Kenichi Akiyama Tsutomu Furuhashi |
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| Affiliation: | 1. Hitachi, Ltd., Central Research Laboratories, 1‐280 Higashi‐koigakubo, Kokubunji‐shi, Tokyo, 185‐8601 Japan;2. Hitachi Displays, Mobara, Japan. |
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| Abstract: | Abstract— High‐resolution displays are now needed for mobile equipment, not only for cell phones but for other devices such as ultra‐mobile PCs (UMPCs) and mobile Internet protocol televisions (IPTVs). A new low‐cost and low‐power driving method for high‐resolution in‐plane‐switching (IPS) liquid‐crystal displays (LCDs) on a low‐temperature polycrystalline‐silicon (LTPS) thin‐film‐transistor (TFT) platform has been developed. Because this method drives common electrodes separated by each line, it can reduce inversion frequency, unlike “dot‐inversion” or “column‐inversion” methods. On the other hand, it was found that horizontal smear is an obstacle to achieve this method. To solve this problem, techniques to optimize the timing of RGB time‐sharing are proposed. A 5‐in. WXGA (1366 × 768) prototype using the new driving method was fabricated, and it was found that the horizontal smear is less than ±1% of the luminance and that the power consumption of the display discharge and charge is 0.245 W. |
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| Keywords: | UMPC IPTV WXGA IPS LTPS RGB time‐sharing driving method horizontal smear |
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