Supertwist Displays for Personal Computers

As described above (Chapter 4), due to the birefringence effect, the first versions of supertwisted displays operated in two-color modes, i.e., yellow and blue. It was not very impressive and strongly limited their applications. Since 1987 several black-white variants of supertwist displays were proposed. Three of them are shown in Table 8.2. 

Further improvement, based on optimization of the display configuration and liquid crystal parameters, leads to the realization of N = 400 addressed rows (multiplex ratio 400 1) with a high contrast ratio. By incorporating color filters to the black-white supertwisted display a multicolor module has been manufactured. 

TABLE 8.2. Characteristics of black and white supertwisted displays. 

Mechanism of black and white image Optimization of An d (And 0.5 /i) Compensation of color by dichroic dye Phase compensation of color 

Viewing angle range Moderate Wide Moderate 

---