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

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.

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 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.

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.

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.

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).