61results about How to "Improve polarization efficiency" patented technology

A backlight unit and a liquid crystal display (LCD) apparatus employing the backlight unit. The backlight unit includes a plurality of light-emitting device units disposed on a base plate in an array, each light-emitting device unit including a collimator to collimate light emitted by a light-emitting device so that the light propagates in a principal propagation direction of light emitted from light-emitting device, a plurality of side reflectors disposed in an array above the array of corresponding light-emitting device units and to reflect lateral light incident from the corresponding light-emitting device units, a reflective diffusion plate to reflect and diffuse light incident from the side reflectors, and a transmissive diffusion plate that is disposed above the light-emitting device units, to transmit and diffuse the incident and reflected light.

A side light-emitting device, a backlight unit using the side light-emitting device as a light source, and a liquid crystal display (LCD) apparatus employing the backlight unit. The side light-emitting device includes a light-emitting device to generate light and a side emitter disposed adjacent to the light-emitting device to emit the light incident from the light-emitting device in a lateral direction. The side emitter includes a reflecting surface to reflect incident light, and a reflecting/refracting surface to totally internally reflect light incident directly from the light-emitting device to the reflecting surface and to refract the light incident from the reflecting surface so that the refracted light propagates in the lateral direction. Since the side light-emitting device emits most the light in the lateral direction, using the side light-emitting device as a light source in a backlight unit allows light to be mixed evenly.

A thermotropic optical shutter device incorporates coatable, thin-film polarizers with a thermotropic depolarizer. The coatable polarizers provide a mechanism for adjusting the polarizer properties (i.e., absorption, reflection, or diffusion) by changing the thickness of the coating. For example, a thicker film may have a higher relative polarizing efficiency while a thinner film may have a lower relative polarizing efficiency. Using the same base materials and manufacturing process, the contrast ratio and other properties of a thermotropic or thermochromic shutter device (e.g., a liquid crystal-based smart window film) may be adjusted in real time on the manufacturing line.

The invention relates to an organic second-order non-linear optical chromophore with a D-Pi-A structure and decorated by a tree-like group, and a synthesizing method and applications thereof. The chromophore of the invention introduces a thiophene ring conjugated Pi electronbridge having stronger electrical transmission capacity and containing branched chains and a tricyano pyrroline receptor having strong electron-withdrawing property; the receptor end is introduced into the tree-like decorative group, the one-order hyperpolarizability of chromophore molecules is greatly improved; the solubility and the film forming ability of the chromophore in polymer is improved, the interaction force among the molecules is reduced. The second-order non-linear optical chromophore with the following structure is doped with polymers, such as amorphous polycarbonate or polymethylmethacrylate and the like according to the mass ratio of 1:10; the electro-optical coefficient of the obtained polarized polymeric materials achieves 217pm/V; in addition, the donor and receptor of the chromophore can be introduced into a crosslinkable group, thus improving oriented stability of the chromophore in polymer, and satisfying the requirements of devices.

The invention relates to a piezoelectric ceramic material with high voltage electric response and a high Curie temperature and a preparation method thereof. A stoichiometric ratio accords with a chemical general formula (1-x)(K0.48Na0.52)(Nb1-ySby)O3-xBi0.5(Na0.8K0.2)0.5ZrO3; wherein x is more than or equal to 0.02 and less than or equal to 0.04, and y is more than or equal to 0.02 and less than or equal to 0.04. The preparation method comprises the following steps of: (1), preparing a base material according to the stoichiometric ratio and a sodium niobate (NaNbO3) sheet template for texturegrowth of crystal grains; (2), weighing the base material, the template and a MnO2 sintering aid according to the stoichiometric ratio, placing the weighed base material, template and MnO2 sintering aid in a nylon tank, adding a solvent, a dispersant and a binder, and uniformly stirring the mixture to obtain casting slurry with good fluidity; (3) casting the slurry to obtain a strip-shaped thick film, cutting the thick film after the thick film is dried, laminating and hot pressing the thick film into a ceramic blank body; (4) removing the blank body from the adhesive, and sintering the blankbody by using a two-step sintering process to obtain lead-free textured piezoelectric ceramic, wherein the lead-free textured piezoelectric ceramic has high piezoelectric performance and a high Curietemperature. The environment-friendly lead-free piezoelectric ceramic material has higher practical value in the fields of low and medium temperature sensors, transducers, drivers and the like.

A projector includes: a light source; a polarization conversion element array having an entrance surface on which an effective entrance area and an ineffective entrance area are disposed to form stripes; a modulation device adapted to modulate a linearly polarized light beam emitted from the polarization conversion element array in accordance with an image signal; a projection device adapted to project the modulated light beam; a first light shielding section, a part of the entrance surface being provided with the first light shielding section adapted to shield a part of the incident light beam to the effective entrance area; and a first opening section, the first opening section being another area of the entrance surface than the part provided with the first light shielding section, at least a part of the first opening section reaches an end of the entrance surface.

The invention discloses a method for monitoring the vehicle speed and load by piezoelectric arrays, which is characterized in that two columns of parallel piezoelectric arrays are embedded at intervals along the driving direction of automobiles on the road surface, the two columns of piezoelectric arrays are internally equipped with the same number of piezoelectric aggregate units, the piezoelectric aggregate units in the two columns of piezoelectric arrays are uniformly arranged at intervals and have the same spacing distance, all piezoelectric aggregate units in the piezoelectric arrays areconnected with a signal acquisition system in parallel, and the signal acquisition system is led to a processing system through a data line; the processing system obtains the driving speed of a vehicle according to time parameters; and the load of the vehicle is obtained according to the voltage generated when the vehicle runs over the piezoelectric arrays. The method is used for monitoring the pressure stress of the vehicle for the road surface and the vehicle speed. Compared with the existing piezoelectric sensor, the sensing performance is more sensitive and more stable.

Nonlinear optical chromophores having one or more diamondoid groups covalently attached to the chromophore, methods of making nonlinear optical chromophores, their use in thin films and electro-optical devices containing such nonlinear optical chromophores and thin films comprising the same.

The present invention relates to a high dielectric constant nano-filtration composite film, which comprises a porous base film and a polyester amine active layer attached onto the porous base film, wherein the porous base film contains a high dielectric constant modifier and a film material, a weight ratio of the high dielectric constant modifier to the film material is 1-25%, and the polyester amine active layer comprises a polyamine monomer. The preparation method of the high dielectric constant nano-filtration composite film comprises: 1) modifier preparation; 2) film casting liquid preparation; 3) film formation; 4) curing; and 5) nano-filtration composite film forming. According to the present invention, by adding the high dielectric constant modifier, the dielectric constant of the nano-filtration composite film can be well improved; by combining the high dielectric constant nano-filtration composite film and the unique DEP power supply of our company, the pollution resistance of the nano-filtration composite film can be significantly improved; and under the action of dielectric electrophoresis, the pollutants can be enriched around the electric field and cannot be adsorbed onto the surface of the nano-filtration composite film, such that the flux of the nano-filtration composite film, the quality of the produced water and the like can be substantially improved.

The invention provides a storage unit and a memory with the same. The storage unit comprises a first MTJ and a second MTJ; the first MTJ comprises a polarization layer; any cross section in a height direction of the first MTJ has a first surface area; the second MTJ comprises a reference layer; the first MTJ and the second MTJ share a free layer; any cross section in a height direction of the second MTJ has a second surface area; and the first surface area is greater than the second surface area. When a certain amount of current passes through the second MTJ, a magnetization direction of the free layer is turned over through a magnetic rotation transfer moment effect; when the magnetization directions of the reference layer and the free layer are parallel or anti-parallel, the resistance of the second MTJ is in a low or high-resistance state; and the polarization layer and the free layer are isolated through a first nonmagnetic layer, and the magnetization directions of the polarization layer and the free layer are perpendicular. Due to the adoption of a novel device structure, a writing current of the magnetic rotation memory can be effectively reduced, the writing speed of the magnetic rotation memory can be increased, and the like.

The invention relates to a nuclear magnetic resonance gyroscope with discrete working media, which adopts a form that three air chambers are closely connected in parallel, so that two processes of atomic polarization precession and atomic precession magnetic moment detection are independent, and high-precision precession magnetic moment detection in a specific direction is easy to achieve withoutbeing interfered by a driving magnetic field. The depolarization effect of detection linearly polarized light on atoms does not need to be considered, and the gas component filling of each atom gas chamber only needs to consider the single effect of the gas chamber, so that the gas component is easy to optimize; the types of filling gases are few, and the requirements on the atomic gas chamber filling process are reduced.

The invention discloses a nuclear magnetic resonance water detector transmitter based on dynamic compensation. The nuclear magnetic resonance water detector transmitter comprises a control module, a transmitter charging module, and a transmitter pulse transmitting module. The control module comprises a single-chip microcomputer module and a PC, which are connected with each other. The transmitter charging module comprises a lithium battery pack, a first relay, a boosting circuit, a constant current source, a power supply large capacitor, and a detection circuit. The transmitter pulse transmitting module comprises a second relay, a switching device control module, a Larmor frequency generator, an H bridge inverter module, a matching and tuning capacitor, and a transmission coil. The nuclear magnetic resonance water detector transmitter based on the dynamic compensation is advantageous in that during the discharging process of the capacitor, the capacitor voltage compensation is carried out, and the before the capacitor voltage decreases to a certain extent, the transmission time of the transmitter is prolonged by compensating the capacitor voltage, and the greatest pulse moment of the transmission pulses is 60000 A/ms, excitation times of polarization of an aquifer at an equal level are reduced, and the working efficiency of the transmitter is greatly improved.