Reflective liquid crystal color display technologies

✍ Scribed by Kinya Kato; Keiji Tanaka; Munekazu Date

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 169 KB
• Volume: 81
• Category: Article
• ISSN: 8756-663X
• DOI: 10.1002/(sici)1520-6432(199808)81:8<32::aid-ecjb5>3.0.co;2-3

✦ Synopsis

The reflective liquid crystal color display technologies studied recently have placed an emphasis on colorization techniques in order to achieve color displays. The techniques may be classified into selective absorption and selective reflection types. Examples of techniques based on the selective absorption are provided by the color filter method and the guest host method with dichroic dyes. The wavelength selectivity of refractive-index periodicity offers an example of selective reflection. In this regard, the method using a cholesteric liquid crystal, in which the liquid crystal itself forms a refractive-index periodicity, and that using a holographic polymer dispersed liquid crystal (HPDLC) are presented. In the latter, the holographic method is applied to the polymer dispersed liquid crystal (PDLC) to form the periodic structure. Unlike the conventional holograms, in HPDLC holograms the characteristics are controlled by an applied electric field.