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Head Up Display Using Dot Matrix LCD (II)
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English
Abstract
Methods of color change (ie /greenired) in the dot-matrix LC Head UP Display, using the Double-Layered Super Twisted Nematic (D-STN) LCD. are discussed.
Since LCD is a non-emissive device, the display color depends not only on the transmission spectrum of LCD but also on the backlight color.
To achieve a color change by altering the transmission spectrum of an LCD, an additional LC cell, such as an ECB(Electrically Controlled Birefringence) cell or a TN cell with a color polarizer, can be stacked on the D-STN cell. In the case of the ECB cell, display color can be controlled electrically, but disadvantage of this technique are that the color purity for red is poor and the birefringence of the cell is temperature dependant. Therefore, a temperature compensation technique for the operating voltage is required. On the other hand the TN cell can also give color switching between two colors, but the operation is much easier than that of the ECB. However the color purity and ON-transmission of a TN color switch are lower than backlighting color change technique.
Another method available for creating color change involves using a backlight technique. A change in color is achieved by using two kinds of fluorescent lamps which have different luminous substances (green & red). The color can be changed between the two colors arbitrarily, using a dimming technique.
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Authors
- Hiroshi Hasebe - Asahi Glass Electronic Products R&D Center Co., Ltd.
- Tetsuro Ohta - Asahi Glass Electronic Products R&D Center Co., Ltd.
- Yutaka Nakagawa - Asahi Glass Electronic Products R&D Center Co., Ltd.
- Kenji Matsuhiro - Asahi Glass Electronic Products R&D Center Co., Ltd.
- Kazutoshi Sawada - Optrex Corp.
- Shigeru Matsushita - Asahi Glass EMP Corp.
Topic
Citation
Hasebe, H., Ohta, T., Nakagawa, Y., Matsuhiro, K. et al., "Head Up Display Using Dot Matrix LCD (II)," SAE Technical Paper 900667, 1990, https://doi.org/10.4271/900667.Also In
New Technologies in Automotive Electronic Displays and Information Systems
Number: SP-0809; Published: 1990-02-01
Number: SP-0809; Published: 1990-02-01
References
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- Iino T. Ohtsuka T. Suzuki Y. SAE paper sp-734, 88021
- Patterson S. Farrer J. Sargent R. Proc. SPIE. 958 1988 114
- Katayaroa M. Yano K. Ohtsuka I. Chan C. SAE paper sp-734, 880559 1989
- Okabayashi S. Sakata M. Fukano J. Daidoji S. Hashimoto C. Ishikawa T. SAE paper sp-770, 890559 1989
- Nakanawa. T. Ohta. H. Hasebe. M. Matsuhiro Akatsukam. K. Sawada K. SAE paper sp-770, 890289 1989