141results about How to "Suppress color unevenness" patented technology

A chip-type light-emitting semiconductor device includes: a substrate 4; a blue LED 1 mounted on the substrate 4; and a luminescent layer 3 made of a mixture of yellow / yellowish phosphor particles 2 and a base material 13 (translucent resin). The yellow / yellowish phosphor particles 2 is a silicate phosphor which absorbs blue light emitted by the blue LED 1 to emit a fluorescence having a main emission peak in the wavelength range from 550 nm to 600 nm, inclusive, and which contains, as a main component, a compound expressed by the chemical formula: (Sr1-a1-b1-xBaa1Cab1Eux)2SiO4 (0≦a1≦0.3, 0≦b1≦0.8 and 0<x<1). The silicate phosphor particles disperse substantially evenly in the resin easily. As a result, excellent white light is obtained.

An acrylic resin composition comprising the following acrylic resins (1) and (2): acrylic resin (1): an acrylic resin containing a structural unit derived from a monomer (a) (structural unit (a)), a structural unit derived from a monomer (b) (structural unit (b)) and a structural unit derived from a monomer (c) (structural unit (c)) and containing the structural unit (c) in an amount of 0.05 to 5 parts by weight based on 100 parts by weight of the acrylic resin (1); acrylic resin (2): a straight chain acrylic resin containing the structural unit (a) as the main component; (a): a (meth)acrylate of the formula (A) (wherein, R1 represents a hydrogen atom or methyl group, R2 represents an alkyl group having 1 to 14 carbon atoms or an aralkyl group having 1 to 14 carbon atoms, and a hydrogen atom in the alkyl group R2 or a hydrogen atom in the aralkyl group R2 may be substituted with an alkoxy group having 1 to 10 carbon atoms.), (b): a monomer containing an olefinic double bond in the molecule and at least one 5- or more-membered heterocyclic group in the molecule, (c): a monomer containing at least two olefinic double bonds in the molecule.

The invention provides an adhesive composition, an adhesive and an adhesive sheet which are suitable for optical components, such as polarization light panel, etc., and have light diffusivity, good stress relaxation rate, uneveness follow-up property and durability. The composition contains first (methyl) acrylic ester polymers (A) having a Mw of 500-3000 thousands, second (methyl) acrylic ester polymers (B) having a Mw of 80000-300 thousands, a cross-linking agent (C) and light diffusion micro-particles(D). The ratio of the polymers (B) with respect to 100 parts by mass of the polymers (A) is 5 to 50 parts by mass. The polymers (B) contain monomers having functional groups (b1) reacting with the cross-linking agent (C), and the ratio of the monomers in the polymers (B) is more than 1 mass% and less than 50 mass%. The polymers (A) do not contain monomers having functional groups reacting with the cross-linking agent (C) or contain monomers having functional groups (a1) having reactiveness with the cross-linking agent (C) lower than that of the functional groups (b1). The ratio of the light diffusion micro-particles(D) with respect to 100 parts by mass of the polymers (A) and the polymers (B) is 5.0 to 50.0 parts by mass.

Provided are: a composite wavelength conversion powder which has high utilization efficiency of light and high utilization efficiency of a constituent material, and which is capable of achieving a good balance between highly efficient light emission and high reliability; and a resin composition which contains this composite wavelength conversion powder. This composite wavelength conversion powder is obtained by dispersing phosphor particles having a refractive index of 1.6 or more in a matrix particle which contains fine magnesium fluoride particles or fine calcium fluoride particles. Also provided is a light emitting device which is capable of improving the utilization efficiency of light produced by phosphor particles that are excited by primary irradiation light irradiated from a light emitting element, and which is capable of improving the optical output of light emission by increasing the amount of secondary irradiation light produced by the phosphor particles, while suppressing the occurrence of color unevenness or color variation of the light discharged to the outside of the device. A light emitting device (1) of the present invention is provided with a substrate (2), a light emitting element (3) that is mounted on the surface of the substrate (2), and a light transmitting member (4) that covers the light emitting element (3). This light transmitting member (4) contains composite wavelength conversion particles (12) which are composed of phosphor particles that have an average particle diameter of 500 nm or less and inorganic particles that are transparent to visible light and have an average particle diameter of 500 nm or less.

A light emitting device is provided with a semiconductor light emitting element and a wavelength conversion portion. The wavelength conversion portion includes an outer peripheral portion between an input surface and an output surface. The outer peripheral portion includes a first inclined part at a side of the input surface and a second inclined part at a side of the output surface. The first inclined part and the second inclined part define a projecting portion that is projected on the outer peripheral portion.

An image display device is capable of displaying an image, in which occurrence of color unevenness is suppressed. A method of driving the image display device is also disclosed. In an area above the dotted line, red light is transmitted in a first sub-frame period. In second and third sub-frame periods, light blocking data are respectively supplied as green data and blue data. Therefore, green light and blue light cannot be transmitted through the area. Hence, a red image with no color unevenness is displayed in the area. In contrast, in an area under the dotted line, the red light is transmitted in the first sub-frame period, and the green light is transmitted in the second sub-frame period. As a result, in a viewed image of the area, there is color unevenness where green is mixed to red.

The invention provides a light source module, surface area light-emitting unit, and surface area light-emitting device that have versatility, where installation work is simplified and production costs are reduced, and where irregularity of light emission and color is sufficiently suppressed. The light source module has a light direction-converting optical element (29) and an LED (28). The light direction-converting optical element (29) has a recess (290) with a light incident surface (29A) into which light enters, a light reflecting surface (29B) for reflecting light entered from the light incident surface (29A), and a light emitting surface (29C) for emitting to a side the light reflected by the light reflecting surface (29B). The LED (28) is placed in a recess (290) of the light direction-converting optical element (29) with a gap provided in between them and applies light to the light incident surface (29A).

The present invention is intended to provide an image processor that can reduce color unevenness occurring in a composite color image formed by overlapping different types of inks due to a variation in printing characteristic among a plurality of nozzles while suppressing a reduction in processing speed in generation of printing data. The image processor converts a color signal indicating the image represented by a plurality of elements to a color signal corresponding to the plurality of inks with use of a conversion table determined on the basis of ejection characteristics of nozzle groups corresponding to the plurality of inks so as to suppress color unevenness occurring in a composite color image due to a variation in ejection characteristic among the plurality of nozzles.