35results about How to "High brightness gain" patented technology

A method for bleaching pulp includes introducing a bleaching liquor in at least one refiner to contact lignocellulosic particulates processed therein in the formation of pulp, wherein the bleaching liquor includes at least one peroxide, magnesium sulfate, caustic hydroxide, at least one chelating agent, and less than 0.1%, or less than 0.01%, or less than 0.001% by weight silicate based on dry weight of the lignocellulosic particulates. Magnesium perhydroxide is generated in situ in the refining system with bleaching of the particulates during refining and reduced scale occurs by use of the silicate or essentially silicate free conditions. A free or essentially silicate-free bleaching liquor which can provide highly brightened pulps also is described.

The invention relates to the field of optical thin film, in particular to optical thin film and a preparation method thereof. In order to solve the problem that the luminance of existing peep-proof film is prone to decline, the invention provides the optical thin film and the preparation method thereof. The optical thin film comprises a light path alignment structural layer, a base film layer, a dodging diffusion layer, a light screening structural layer and a surface protection layer from bottom to top in sequence. The optical thin film has high luminance gaining and peep proofing effects atthe same time.

The invention discloses a miniaturized high-gain low-illuminance night-vision imaging device for similar night vision products for the military helmet night-vision device and related industry. The main technical scheme is as follows: a tube shell input end is hermetically sealed with an input window, a tube shell tail end is hermetically welded with an output end of a CMOS image sensor, a photoelectric cathode is plated in a surface effective area in the input window; a micro-channel plate is mounted between a second metal ring and a third metal ring of the tube shell; the CMOS image sensor iswelded with a ceramic substrate, and the output end of the CMOS image sensor is connected with a readout circuit board. A test result shows that the phenomenon that the original device is low in gainis overcome thoroughly, and the demands of effectively improving the device gain, realizing the miniaturization and being suitable for the military helmet night-vision device and like night-vision product for single use are reached.

The invention provides a projection screen and a projection system, which relate to the technical field of projection. Wherein the projection screen comprises a substrate layer; An imaging layer formed on one side of the substrate layer; A light-reflecting film lay is formed on a side of that image layer remote from the substrate layer. The reflective film layer includes a first film layer and a second film layer having a different refractive index from the first film layer so that the reflective film layer is capable of reflecting light of red, green, and blue colors and absorbing light of other colors than red, green, and blue colors. With the above-mentioned setting, the problem that the imaging effect of the existing projection screen is poor can be overcome.

The invention relates to an optical diffusion film, in particular to a high-luminance optical diffusion film. The problem of low brightness gain of an existing diffusion film is solved. The high-luminance optical diffusion film is simple in structure and convenient to manufacture. The high-luminance optical diffusion film comprises a base material, an optical diffusion layer and an anti-adhesion layer. The anti-adhesion layer contains air bubbles. The high-luminance optical diffusion film has high brightness gain and high brightness.

The invention provides a brightening film and a preparation method thereof. The brightening film comprises a base material, a light condensing layer and a refraction layer. The light condensing layer is arranged on the upper surface of the base material and composed of a plurality of light condensing structures. Each light condensing structure comprises a bottom face making contact with the upper surface of the base material. The upper surface of the light condensing layer is of a concave-convex structure. The refraction layer is arranged on the upper surface of the light condensing layer. A concave-convex structure matched with the concave-convex structure of the upper surface of the light condensing layer is arranged on the upper surface of the refraction layer. The refraction layer is prepared from an inorganic nanometer particle composition and volatile solvent. The inorganic nanometer particle composition is prepared from inorganic nanometer particles, first attenuation monomer, first photoinitiator and first surface auxiliaries. In the brightening film, an inorganic nanometer particle layer is attached to the upper surface of the light condensing layer independently to be used as the refraction layer, the phenomenon that because inorganic nanometer particles are added to a light-cured resin composition, components are incompatible can be avoided, and the brightening film can have a high refractive index and brightness gain.

A high efficiency bleaching method for cellulosic pulp includes: (a) providing a charge of aqueous cellulosic pulp to a bleaching vessel at a consistency of from 10% to 30% along with a peroxy bleaching agent and an alkaline agent effective to adjust pH of the charge to 9.5 to 12.5; and (b) bleaching the aqueous cellulosic pulp in the bleaching vessel while maintaining a bleaching temperature of from 110° F. (43° C.) to 135° F. (57° C.) and a pH of the charge from 9.5 to 12.5 for an extended bleaching retention time. The bleaching method is advantageously used to bleach low brightness recycle pulp, and/or as part of a multistage process with bleaching stages of lesser duration, and/or as a high peroxy efficiency, low dose bleaching process or in connection with concurrently storing and bleaching pulp.

The invention provides a brightness enhancement film, a preparation method therefor, and an optical composite film. The brightness enhancement film sequentially comprises a base material, a condensation layer and a refraction layer from the bottom to the top, wherein the condensation layer consists of a plurality of condensation structures. The condensation structures are respectively provided with a bottom surface which contacts with the upper surface of the base material. The refractive index of the refraction layer is greater than the refractive index of the condensation layer, and the upper surface of the refraction layer is provided with a concave-convex structure which is matched with a concave-convex structure on the upper surface of the condensation layer. In the above brightness enhancement film, the upper surface of the condensation layer is provided with a refraction layer with relatively high refractive index in an attaching manner. The upper surface of the refraction layer is enabled to be provided with the concave-convex structure matched with the concave-convex structure on the upper surface of the condensation layer, thereby equivalently enabling the surface of the brightness enhancement film to maintaining the geometrical shapes of the condensation structures. The refraction layer with the high refractive index can remarkably improve the condensation degree of light on the brightness enhancement film, thereby improving the brightness gain of the brightness enhancement film. Meanwhile, the geometrical shapes of the condensation structures are maintained, thereby preventing the arrangement of the refraction layer from causing the change of the geometrical optical effect.

The invention discloses a high luminance gain metal curtain preparation method. The high luminance gain metal curtain preparation method comprises dosing, mixing, film manufacturing and baking processes sequentially. According to the dosing process, raw materials comprise, by weight, 100 parts of polyvinyl chloride (PVC) pastes, 3-10 parts of metal powder, 10-15 parts of anatase titanium dioxide, 70-85 parts of dioctyl phthalate or/and dioctyl adipate plasticizers, 3-8 parts of chlorination aliphatic ester surface treating agents, and 6-10 parts of epoxidized soybean oil heat stabilizers. The mixing process comprises the following steps: premixing all the raw materials in the dosing process S1, grinding sizing agents through a three-roll grinder, standing and dissolving, and dispersing through a dispersion machine. According to the film manufacturing process, a scraper coating machine coats the sizing agents obtained through the mixing process on a curtain blank in a scraping mode. According to the baking process, a subsection baking process with temperature increased successively is adopted for baking the curtain blank coated with the sizing agents in the scraping mode. Compared with the prior art, luminance gain of a metal curtain obtained through the method is high and can reach 3.0-3.5.

The invention discloses a projection screen, the projection screen at least comprises a diffusion layer, a reflection layer and a microstructure layer, the reflection layer is arranged between the diffusion layer and the microstructure layer, the microstructure layer comprises a plurality of Fresnel structures, each Fresnel structure comprises a first surface and a second surface, the reflection layer is partially formed on the first surfaces of the Fresnel structures, the diffusion layer is used for inputting an incident projection beam to the reflection layer, and the reflection layer reflects the projection beam to a field of view area. In this way, the brightness gain and the anti-ambient light contrast consistency of the projection screen can be improved.

The invention discloses a projection curtain with an optical structure. The projection curtain comprises a base material layer and an optical structure layer, wherein the optical structure layer of the projection curtain with the optical structure comprises a plurality of long-strip-shaped concave mirror structures arranged on a base material layer, the optical structure layer comprises a plurality of reflection structures and a plurality of light-transmitting structures, the reflection structures and the light-transmitting structures are arranged alternately and are all arranged on the base material layer, when light emitted by the projection equipment irradiates the projection curtain with the optical structure, the reflection structure reflects the light to converge the light, and the refraction structure can transmit ambient light, so that the ambient light is absorbed by the base material layer. The projection curtain with the optical structure is low in cost, can absorb ambient light, improves the brightness gain of the screen, maintains the original visual angle, and improves the image brightness of the curtain.

The invention discloses slurry for making a high-brightness metal screen. The invention is characterized in that the slurry is composed of, by weight, 100 parts of PVC paste resin, 3-10 parts of metal powder with a glassy thin layer on the surface, 10-15 parts of anatase titanium dioxide, 70-85 parts of dicapryl phthalate or/and dioctyl adipate plasticizer, 3-8 parts of a chlorinated fatty acid ester surface conditioning agent and 6-10 parts of an epoxidized soybean oil heat stabilizer, wherein the weight ratio of the glassy material to the metal powder without the glassy thin layer is 0.1-10%. From the perspective of formula, high-brightness gain of the metal screen is realized. As the glassy thin layer is arranged on the surface of the metal powder, the metal powder can be prevented from being oxidized during the roasting process, and the glassy thin layer on the surface can increase brightness gain of the screen. The metal screen with high-brightness gain which is obtained by the above method can be used as a 3D projection screen.

The invention discloses a composite optical membrane, a backlight module and a liquid crystal display device. The composite optical membrane comprises at least two prism type membranes which are arranged in an intersecting way; diffusion sheets with high positive penetration rates are attached to the prism type membranes; and the positive penetration rates of the lower diffusion sheets with high positive penetration rates are higher than 85 percent and lower than 95 percent. In a framework formed by the lower diffusion sheets and the intersecting prism type membranes in the invention, the relation between the positive penetration rates of the lower diffusion sheets and the luminance gain of the entire optical membrane is integrally reached, and an appropriate range of the positive penetration rates of the lower diffusion sheets with high positive penetration rates is determined, so that the optical functions of the lower diffusion sheets can be ensured, the luminance gain of the composite optical membrane is increased remarkably, and appropriate luminance is achieved for the backlight module.

The invention discloses a reflection type lateral projection screen and a projection system, the projection screen comprises a reflection function layer with the same size as the projection surface ofthe projection screen, and the reflection function layer comprises a concentric circle microstructure layer and a reflection material layer which are sequentially arranged from outside to inside along the thickness direction of the projection screen; wherein the concentric circle microstructure layer is obtained by intercepting a part of rectangular area from a complete concentric circle microstructure array, and the circle center of a microstructure unit in the concentric circle microstructure layer deviates from the perpendicular bisector of the projection screen. The invention aims to provide a reflective lateral projection screen and a projection system, and solves the problems of low brightness gain, brightness uniformity offset, horizontal view angle bilateral asymmetry and low image contrast of the existing projection screen and projection system.

The invention discloses a projection screen coating. The coating comprises components in parts by weight as follows: 100 parts of polyvinyl chloride paste resin, 1-8 parts of metal powder, 10-15 parts of anatase titanium dioxide, 0.5-2 parts of hollow glass powder,1-3 parts of common glass powder,70-85 parts of a plasticizer and 6-10 parts of a heat stabilizer. According to the coating, two types of glass powder and the metal powder are used together, so that the hygroscopicity of the screen is reduced; the glass powder is prevented from falling off; the hollow glass powder has the characteristic of light weight and is not liableto fall off; the two types of glass powder and the metal powder are used together, so that the production cost of the screen is reduced; and the obtained screen has high luminance gain.

The invention discloses a multi-point touch light-resistant hard glass rear-projection ink crystal screen, which relates to the technical field of screen equipment. The screen comprises an ink crystallayer, an optical structure base layer, an imaging layer and a hard base layer which are sequentially attached from front to back; the hard base layer is transparent, a light-transmitting circuit board is arranged in the hard base layer, and the light-transmitting circuit board is used for detecting the action that a user presses the ink crystal layer; the imaging layer is used for enabling projection equipment to project light to the imaging layer for imaging; the optical structure base layer comprises a linear grating base layer and a structure layer, the rear side surface of the linear grating base layer is attached to the imaging layer, and the structure layer comprises a plurality of convex structures horizontally arranged on the front side surface of the linear grating base layer; and a plurality of horizontal light absorption layers are sequentially arranged in the optical structure base layer at intervals from top to bottom. The multi-point touch light-resistant hard glass rear-projection ink crystal screen has the advantages of maximized light absorption area, good user experience and good imaging effect.