Multi-domain vertical alignment
Multi-domain Vertical Alignment (MVA) and Patterned Vertical Alignment (PVA) are special versions of liquid crystal displays (corresponding substrates are called panels).
construction
MVA technology was developed in 1996 by the Fujitsu company. With this technique, the liquid crystal molecules are aligned vertically to the substrate surfaces in the resting state, which means that the screen appears dark between crossed polarizers. PVA technology is a display variant from Samsung that essentially corresponds to MVA technology. In MVA and PVA technology, the cells of each pixel consist of several sub-areas (domains).
MVA and PVA panels have a relatively long response time , which can lead to "streaking" or "washing out". With newer panel types such as S-PVA (Super-PVA from Samsung - further development of PVA technology) or P-MVA (Premium-MVA from AU Optronics - further development of MVA technology), these problems have been significantly reduced. In these variants, the individual cells no longer consist of four, but of eight sub-areas. The response time is around 5 ms and is comparable to that of TN panels. S-PVA and P-MVA panels offer higher color fidelity than MVA or PVA panels, but still lower than that of S-IPS panels.
application
In contrast to the TN panels , which are mostly preferred by players due to their shorter reaction times, monitors with MVA and PVA panels are mainly used in the professional sector.
Typical applications are CAD / CAM , DTP and medical technology . MVA panels are characterized by high contrast (1000: 1 to 5000: 1), a wide viewing direction range of at least 160 ° to a maximum of 178 °, high color fidelity and color stability .
Individual evidence
- ↑ ME Becker, U. Kuhlmann: Kristallmanufaktur - Steps on the way to the direction-independent LC screen. In: c't. No. 22, 2005, p. 222 (paid online access: [1] )