58results about How to "Improve electro-optic performance" patented technology

Polymer network liquid crystal materials have improved mechanical properties such as rigidity and hardness and substantially improved electro-optical performance. The PNLC material can be manufactured with an emulsion process so as to simplify substantially the manufacturing process. Each LC droplet can be configured with the polymer network extending substantially across the LC droplet, and the polymer network may comprise a material to lower substantially the switching voltage, such as a fluorinated acrylate that may interact with the liquid crystal so as to lower the surface tension of the LC droplet. The PNLC material may comprise an interfacial layer combined with the polymer network so as to decrease substantially the driving voltage.

The performance of an electro-optic display, for example, a bistable electro-optic display, can be improved by modifying the frame rate of a base waveform used to drive a transition between gray states. Such modifications permit fine control of gray levels with reduced artifacts. The described methods additionally require less memory to store all of the waveforms needed to achieve good performance of an electro-optic display over a range of temperatures.

The invention provides a preparation method of a polymer dispersed liquid crystal film, is applied to preparation of electronic control intelligent glass and belongs to the field of liquid crystal material application. The method comprises the steps of: uniformly mixing thermal polymerizable monomers, curing agents, nematic liquid crystal and glass microbeads in certain mass ratio; subsequently clamping the mixture between two conductive films plated with indium tin oxide at the temperature 0.5-20.0 DEG C higher than the clearing temperature of the liquid crystal phase of the thermal polymerizable monomers / curing agents / liquid crystal composite materials; compressing with a roll shaft uniformly so as to form a film layer of 10.0-15.0 microns in thickness; heating for 5.0-7.0 hours at 70.0-90.0 DEG C; and finally curing so as to form the polymer dispersed liquid crystal film. The preparation method provided by the invention has the advantages that the thermal stability of a polymer network is enhanced; the flexibility of a PDLC (Polymer Dispersed Liquid Crystal) film is improved; and the mesh size of a macromolecule network is regulated by selecting the optimal ratio of two monomers, so that the purpose of improving the thermal stability and contrast ratio of polymer dispersed liquid crystal film materials and the binding force between the macromolecule network and an ITO (Indium-Tin Oxide) film is reached.

The invention discloses an inverted-structure OLED device based on a strong electron injection layer and a preparation method thereof. The inverted-structure OLED device comprises an ITO transparent cathode, a strong electron injection layer, a BPhen electron transport layer, a TAZ light-emitting layer, a CBP hole transport layer, a molybdenum trioxide hole injection layer and an Al anode from left to right. The strong electron injection layer comprises one or two of a zinc oxide layer and a cesium carbonate layer or a zinc oxide-cesium carbonate layer. The preparation method comprises the steps of preparation of a cesium carbonate-ethanol solution and a zinc oxide-methanol solution, preparation of a mixed solution, treatment of the ITO transparent cathode and preparation of the inverted-structure OLED device. According to the invention, the cesium carbonate and zinc oxide are compounded as the strong electron injection layer; based on the TAZ light-emitting layer, the OLED device shows excellent short wavelength emission, has the maximum radiance of 2.42 mW / cm<2> and EQE of 0.85%, and improves the working durability; and XPS analysis shows that the zinc oxide-cesium carbonate layer shows excellent electronic performance and is beneficial to electron injection, so that the electro-optical performance of the inverted-structure OLED device is improved.

The invention discloses a method for preparing a nano-doped intelligent light-adjusting film. The method comprises the steps of preparing nano metal-oxide particle crystal gel by using a hydrothermal-method or solvothermal-method synthesis method, mixing the gel nanoparticles with relatively high dispersion activity with a prepolymer, adding a small amount of coupling agent into the mixture, mixing the nanoparticles and the prepolymer, dispersing the nanoparticles by using stirring and ultrasonic waves so as to form prepolymer nano sol, mixing the prepolymer nano sol with acrylate and nematic liquid crystals, adding a spacer into the mixture, coating the surface of a PET (Polyethyleneglycol Terephthalate) conductive film with the spacer added mixture by a roll coating process, and initiating photopolymerization under the condition of ultraviolet light, thereby preparing the intelligent light-adjusting film with excellent electro-optic characteristics. According to the method, parameters such as dielectric constant and refractive index of a polymeric matrix are changed through carrying out nano modification on the polymeric matrix, the electro-optic properties of the intelligent light-adjusting film are improved, the operating voltage is 30V, and the light transmittance of the intelligent light-adjusting film is about 70%; and meanwhile, the nano metal oxide particles synthesized by using the hydrothermal or solvent method are dispersed in the polymeric matrix, and the nanoparticles are good in dispersion activity and are not prone to agglomeration, so that the homogeneous dispersion of the nanoparticles in the polymeric matrix is guaranteed.