3results about How to "Small phase difference" patented technology

Examples relate to thin films, transparent laminates, applications as cover films, and multilayer electronic devices incorporating the thin film, which possess excellent optical properties such as refractive index, haze, and yellowness, as well as excellent mechanical properties. The thin film includes an elastic layer with a refractive index of 1.48 to 1.58 and a low-temperature damage index (the difference between tensile modulus and tensile strength at a specific temperature), wherein the low-temperature damage index of the elastic layer at -40°C is below 1300 MPa.

This invention relates to a method for manufacturing an optical film, an optical film, a polarizer, and a liquid crystal display device. The objective is to provide a method for manufacturing a wide-width optical film with low retardation values ​​in both the in-plane and thickness directions, and to suppress display unevenness caused by environmental variations in the display device, using a plant-derived resin. The method for manufacturing the optical film of this invention is characterized by comprising: a step of forming a strip film from a cellulose ester resin containing a total acetyl substitution degree of 2.30 to 2.60 and a sugar ester having a furanose or pyranose structure; and a step of stretching said strip film, wherein the retardation value R... o The range is 0–10 nm, R t The process of stretching the long strip film, with a wavelength of -10 to 10 nm, includes the following steps: a first step to obtain a first stretched film; and a second step to further stretch the first stretched film to obtain a second stretched film, wherein the stretching temperature of the second step is in the range of 190 to 220°C.

This application discloses a phase synchronization method for an energy storage inverter based on half-angle characteristics, comprising: acquiring the input voltage signal from the power grid; locking the phase angle of the input voltage signal using a rotating coordinate method; obtaining the sine and cosine values ​​of the rotation angle of the input voltage signal based on the phase angle of the input voltage signal; converting the sine and cosine values ​​of the input and output voltage signals into half-angle forms according to the half-angle characteristic formula; converting the half-angle forms into the sine and cosine values ​​of the phase angle difference between the input and output voltage signals according to the two-angle sum formula; and using PI control to adjust the phase of the output voltage signal by using the sine value of the phase angle difference as an input quantity. This application achieves phase synchronization of the inverter with the power grid before grid connection, reduces the phase difference between the inverter synchronization signal and the power grid signal, reduces the current generated by the voltage difference during grid connection, and improves the stability of the inverter.