45results about How to "Improve brightness distribution" patented technology

The present invention provides a projection screen capable of sharply displaying an image even under bright environmental light, of improving brightness distribution and viewing angle, and of providing high image visibility, and a projection system including such a projection screen. The projection screen includes: a polarized-light selective reflection layer that selectively reflects a specific polarized-light component; a substrate that supports the polarized-light selective reflection layer; and a circular Fresnel lens provided on the observation side of the polarized-light selective reflection layer. The circular Fresnel lens controls the optical axis of right-handed circularly polarized light projected on the projection screen so that the light enters the polarized-light selective reflection layer nearly vertically to it regardless of the point and angle at which the light is incident on this layer. The right-handed circularly polarized light incident on the polarized-light selective reflection layer is diffuse-reflected from this layer owing to the scattering properties (the property of diffusing light that is selectively reflected, owing to structural non-uniformity in a cholesteric liquid crystalline structure containing a plurality of helical structure parts whose helical axes extend in different directions) possessed by the polarized-light selective reflection layer, and the reflected light is returned, via the circular Fresnel lens, to a particular observation point at which a viewer makes observation.

A light-emitting device includes a light-emitting portion that emits fluorescence in response to excitation light incident on a surface of the light-emitting portion, and a reflector that defines a light-emitting region on the surface of the light-emitting portion, the fluorescence being emitted from the light-emitting region. The excitation light has a top-hat energy intensity distribution on the surface of the light-emitting portion.

An image processing apparatus comprises an extractor for extracting a brightness component from image data; a scale converter for obtaining a distribution of the brightness component on relatively large scale; a brightness component improver for improving the distribution of the brightness component of the image data by using the brightness component and an output of the converter; and an image reproducer for reproducing the image data by using an output of the improver as a distribution of a brightness component of a new image, wherein the apparatus further comprises a face detector for detecting a face area from the image data, and the improver adjusts a degree of improvement by using a distribution of a brightness component of the face area being an output of the detector. Thus, it is possible to automatically adjust the degree of improvement of the luminance distribution according to the image data to be processed.

A projection screen includes a polarized-light selective reflection layer having a cholesteric liquid crystalline structure, capable of selectively diffuse-reflecting a specific polarized-light component; a substrate for supporting the polarized-light selective reflection layer; and an optical member provided on the observation side of the polarized-light selective reflection layer. The optical member diffuses imaging light which the polarized-light selective reflection layer diffuse-reflects, while maintaining the state of polarization of the imaging light. The optical member diffuses right-handed circularly polarized light that is projected on the projection screen, when the light travels from the observation side to the polarized-light selective reflection layer. The diffused light (31a1) enters the polarized-light selective reflection layer and is diffuse-reflected owing to the scattering property of the polarized-light selective reflection layer (the property of diffusing light that is selectively reflected, owing to structural non-uniformity in the cholesteric liquid crystalline structure containing a plurality of helical structure parts, the helical axes of which extend in different directions). The optical member further diffuses this diffused light (31a2) when the light travels from the polarized-light selective reflection layer toward the observation side. The thus diffused light (31a3) finally emerges toward the observation side.

A MVA LCD device and a pixel circuit thereof are disclosed. Each pixel is divided into a first sub-pixel unit and a second sub-pixel unit. One terminal of the storage capacitance of the first sub-pixel unit is electrically connected to a coupling signal line, which is used for providing a coupling electrode voltage. One terminal of the storage capacitance of the second sub-pixel unit is electrically connected to the storage bus line which is used for providing a common voltage. Therefore, the pixel voltage of the first sub-pixel unit is different from the pixel voltage of the second sub-pixel unit through controlling the different coupling electrode voltage.

A MVA LCD device and a pixel circuit thereof are disclosed. Each pixel is divided into a first sub-pixel unit and a second sub-pixel unit. One terminal of the storage capacitance of the first sub-pixel unit is electrically connected to a coupling signal line, which is used for providing a coupling electrode voltage. One terminal of the storage capacitance of the second sub-pixel unit is electrically connected to the storage bus line which is used for providing a common voltage. Therefore, the pixel voltage of the first sub-pixel unit is different from the pixel voltage of the second sub-pixel unit through controlling the different coupling electrode voltage.

In a device according to the present invention, a first conductive electrode layer being patterned and light transmissive is formed on a light-transmissive substrate and a laminated layer containing a plurality of organic-compound layers is formed so as to cover at least a part of the first electrode layer. The laminated layer is partly removed so that the first electrode layer is partly exposed. At least one layer containing a second conductive electrode layer is formed on the laminated layer and the exposed part of the first electrode layer. A part of the laminated layer and a part of the second electrode layer are simultaneously removed by application of a laser beam from a side of the substrate, so that a plurality of light-emitting sections are electrically connected in series on the substrate.

The liquid crystal display unit consists of following parts: first base plate including multiple bulges and first electrode; second base plate of possessing multiple pixel electrodes, first slits, and second slits; a liquid crystal layer located between the first base plate and the second base plate. The first electrode is positioned on surface of the first base plate, and bulges are positioned on part of surface of the first electrode. Pixel electrodes are on surface of the second base plate. First slits are located between pixel electrodes. First slits and bulges are not interleaved with projection of second base plate. Second slit is located at edge of first slit. Extended directions of second slits and bulges are interleaved with projection of second base plate.

The invention provides an image display apparatus (1) comprising a lighting system (100); a LCD element (304); and an actuating means for varying the transmittance of the LCD element (304) according to image signals, wherein the LCD element (304) is designed such that when the angle of view with respect to a specified direction of a screen varies provided that the entire LCD element (304) is in a white display mode, transmittance varies such that it has peak values at viewing angles other than viewing angles in the vicinity of 0 degree, and wherein the lighting system (100) is designed such that the intensities of light beams emitted in the directions of the viewing angles in the vicinity of 0 degree are higher than the intensities of light beams emitted in the directions of the viewing angles at which the transmittance has a peak value.

The invention discloses a Gamma correction based image contrast enhancement method, and relates to the technical field of digital image processing. According to the method, wavelet decomposition is carried out on an input image to obtain a low-frequency image IA and three high-frequency images IH, IV and ID; adaptive Gamma correction is carried out on the low-frequency image IA to obtain a contrast enhanced low-frequency image; noises are removed from the high-frequency images IH, IV and ID respectively to obtain a noise removed high-frequency image; and wavelet inverse transformation is carried out on the contrast enhanced low-frequency image and the noise removed high-frequency image to obtain a reconstruction image. It is proved that the method can be used to overcome a subjective visual effect of the image effectively, inhibit the image noise effectively, improve brightness distribution of the image, and improve the integral contrast of the image.

The present invention provides a backlight module and a display apparatus. The display apparatus comprises a backlight module and a display panel. The backlight module comprises a light guide plate and a plurality of light sources. The light guide plate has a bottom surface. The bottom surface is formed with a middle trench. The middle trench comprises dimming cants. The light sources are positioned at two opposite sides of the light guide plate in accordance with the dimming cants. The present invention can adjust a light intensity distribution and promote the central brightness of the screen.

A backlight module comprises a light source, a photoluminescence layer and an optical film. The light source is used for providing light; the photoluminescence layer is used for generating excitated light through the radiation of the light provided by the light source; and the optical film and the photoluminescence layer are overlapped at the same vertical projection direction. The optical film comprises a substrate and a plurality of two-dimensional symmetrical micro-structures which are arranged on at least one surface of the substrate, and the excitated light is emitted through the two-dimensional symmetrical micro-structures.

The invention relates to a diffusing plate which is mainly formed by light-transmitting materials. The light reflecting surface of the diffusing plate is provided with a plurality of long strip-shaped patterns, the outline of each pattern is provided with a first arc shape and a second arc shape, the convex directions of the first arc shape and the second arc shape are mutually opposite, wherein the second arc shape is an arc, and the curvature radius of the second arc shape is from 0.05 mm to 0.3 mm.

A spread illuminating apparatus is provided which includes: a light conductor plate having a light inlet surface and two major surfaces; a light source unit disposed at the light inlet surface of the light conductor plate; and a light diffuser pattern disposed at the lower major surfaces of the two major surfaces of the light conductor plate, wherein the light source unit includes first and second white light sources which have respective different light emitting principles, are arranged in the width direction of the light conductor plate with their respective ends set close to one another, and which can be turned on and off independently of each other.

The invention relates to a tone mapping method and apparatus. The method comprises the steps of obtaining linear RGB data of a high dynamic range video; mapping the linear RGB data of the high dynamicrange video into RGB data of a nonlinear standard dynamic range according to a first tone mapping function; adjusting the RGB data of the non-linear standard dynamic range according to the brightnesscharacteristics of the display of the standard dynamic range to obtain final RGB data of the non-linear standard dynamic range, wherein the first tone mapping function is mapped on the basis of the encoding standard of the ACES, and the first tone mapping function is obtained by adjusting the tone mapping function of the encoding standard of the ACES on the basis of the video image exposure degree.

A method and system for indirectly illuminating an open interior space, such as an open office, includes using individual lighting fixture modules, each comprised of at least one, and preferably a pair of side-by-side parallel linear indirect fluorescent lighting fixture elements suspended at fixed grid pattern locations beneath the ceiling of the open interior space. Each of the linear indirect lighting fixture elements of the fixture module is preferably no greater than approximately six feet in length with a suitable length being somewhat greater than four feet where a four foot lamp is used. Where the fixture elements are provided in pairs, each is suspended below the ceiling at its fixed grid location by a suitable hanger structure that maintains a spacing between the fixture elements that establishes a preferred overall fixture module with of approximately four feet. The indirect fixture modules are especially well adapted to be suspended below a grid ceiling having square or rectangular ceiling grids for supporting square or rectangular ceiling tiles, however, they can be suspended below other ceiling structures as well.

Under management by a main microcomputer, an LED controller performs, along at least two directions within a plane of planar light formed by LEDs arranged in a matrix, brightness correction processing for adjusting the distribution of brightness of the planar light on light source color video signals to convert them into light source color video signals.

A backlight structural body of a liquid crystal display device includes, between a back plate and a frame-like mold frame, a plurality of external electrode fluorescent lamps which is arranged in parallel to each other and a pair of side frames which includes electricity supply terminals which electrically connect electrode portions of the plurality of external electrode fluorescent lamps in parallel to each other. The side frame is constituted of a lower side frame which fixes the electricity supply terminals and an upper side frame which is assembled to the lower side frame while covering the electrode portions of the external electrode fluorescent lamps which are connected to the electricity supply terminals. The upper side frame includes eaves which project in the longitudinal direction of the external electrode fluorescent lamps in a state that the eaves individually cover the respective electrode portions of the external electrode fluorescent lamps.

The invention relates to an image contrast enhancement method and an image acquisition medical device thereof, belonging to the technical field of digital image processing, aiming at solving the problem that the contrast of the existing Gamma corrected image is not high. The method includes four steps: image wavelet decomposition, contrast enhancement of low frequency image based on Gamma correction, high frequency image denoising and wavelet inverse transform. Through the above steps, the image noise can be effectively suppressed, the image brightness distribution can be improved, the image contrast can be improved, and the subjective visual effect of the image can be enhanced.

A low-pressure discharge lamp with a double spiral shaped discharge tube (2) including two spiral shaped tube portions (21,22). The tube portions (21,22) define a central axis (A) of the discharge tube (2). A cold chamber portion (3) connects the ends of the spiral shaped tube portions (21,22). The cold chamber portion (3) has a first transversal dimension (D1) substantially perpendicular to the central axis (A) which is larger than the diameter (d) of the tube portions (21,22). The cold chamber portion (3) further has a second transversal dimension (D2) substantially parallel to the central axis (A). The second transversal dimension (D2) of the cold chamber portion (3) substantially corresponds to the diameter (d) of the tube portions (21,22).