90results about How to "Uneven brightness" patented technology

A planar lighting device is capable of keeping the light entrance plane of the light guide plate spaced a constant distance from the light source and the light guide plate spaced a constant distance from the liquid crystal display panel even when the light guide plate expands, contracts or warps. This prevents break of the light source, decrease of light admission efficiency, occurrence of uneven brightness, and break of the liquid crystal display panel and permits a thin, larger, and lightweight design. The planar lighting device includes a fixing member for keeping them spaced from each other, a housing for accommodating the light source and the light guide plate, a sliding mechanism to elastically hold the fixing means against the housing while keeping the light source spaced a constant distance from the light guide plate, and a reinforcing member for reinforcing the housing.

Light from light emitting element enters into a flux control member through a recess on an inner face of the light flux control member, being emitted from an emission control face (outer face). At least so far as light falls within a half-intensity-angular-range, the light satisfies Condition 1 (θ5/θ1)>1 except for light in the vicinity of a normal direction of the emission control face) and Condition 2 (Value of θ5/θ1>1 gets smaller gradually with increasing of θ1). It is noted that θ1, θ5 are angles made at being inner-incident to the emission control face and at being emitting from the same, respectively. The emission control face has a planar outline shape which is anisotropic around optical axis L, thereby causing value of θ5 /θ1 to have a change depending on direction angle φ around optical axis L, with the result that highly uniform light is supplied to a required anisotropic irradiation range.

A surface light source device comprises a light emitting section (11) made of a single spot light source, a light guide plate (12), a reflective surface (13) provided on the back side of the light guide plate, and a prism pattern (15). On the light emitting surface side of the light guide plate (12), there is provided a directional light scattering film (14) consisting of at least two phases having different refractive indexes and scattering light when transmitting it. One phase of a larger refractive index includes a plenty of areas having a columnar structure extending in the thickness direction of a film and arranged to be perpendicular to a normal to the film, and exhibiting a maximum scattering angle of 10-40°.

The planar lighting device includes a light guide plate including two symmetrical, inclined planes increasingly distanced from the light exit plane with the increasing distance from the light entrance planes toward the center, a curved portion joining the inclined planes, and scattering particles dispersed therein; light sources; a housing; a securing unit securing the light sources and light guide plate to keep their distance constant, and a sliding mechanism allowing the securing unit to slide. Distance between the light entrance planes, thicknesses at the light entrance planes and at the central curved portion, its radius of curvature and taper of the inclined planes are all held within respective given ranges as well as scattering particle diameter and density, light use efficiency and middle-high ratio of the brightness distribution. A thin planar lighting device yielding high light use efficiency with a minimized brightness unevenness and a high-in-the-middle brightness distribution.

In a lighting device, uneven brightness may be suppressed at low cost. A backlight unit 12 includes: an LED 17; a chassis 14 including a bottom plate 14a provided on a side opposite to a light exit side relative to the LED 17, the chassis 14 housing the LED 17; and a first reflection sheet 22 reflecting light. The first reflection sheet 22 includes a quadrangular bottom 24 extending along the bottom plate 14a, and two raised portions 25 and 26 each of which is raised from each of adjacent two sides of the bottom 24 toward the light exit side, a joint J provided between adjacent two side edges 25a and 26b of the raised portions 25 and 26. In the backlight unit 12, the side edge 25a of the first raised portion 25 of the raised portions 25 and 26 includes a facing portion 28 that faces the side edge 26a of the second raised portion 26 in a direction in which the first raised portion 25 is raised from the bottom 24 (outward in a Y-axis direction), and the first raised portion 25 and the facing portion 28 bulge toward the light exit side.

The light guide plate includes a light exit plane, two light entrance planes, two symmetrical inclined rear planes increasingly distanced from the light exit plane from the two light entrance planes toward a center of the light exit plane, a curved portion joining the two inclined rear planes and scattering particles for scattering light travelling inside the light guide plate. The light guide plate satisfies given ranges set for a length between the two light entrance planes, a thickness of each of the two light entrance planes, a thickness at the center of the curved portion, a radius of curvature thereof, tapers of the inclined rear planes, and a particle diameter and a density of the scattering particles, and conditions that a light use efficiency be 55% or greater and that a middle-high ratio represented by the brightness distribution at the light exit plane be greater than 0% and not greater than 25%.

Disclosed is a dark field illumination apparatus which is capable of performing a dark field illumination which exhibits a sufficient brightness and a sufficiently suppressed unevenness in brightness. The apparatus comprises a shaping system for shaping a light beam from a light source into approximately parallel beam having a ring- shaped section; a fly-eye optical device for forming a plurality of light source images in the vicinity of its exit plane based on the approximately parallel beam, the light source images being arranged circularly; and a light collection optical system for collecting light beams from the light source images and superposing them on an object plane.

The planar lighting device includes rod type light sources, a light guide plate having light guide plate blocks, each being formed of an integral assembly of at least two light guide plate units each having a rear surface with a groove formed to accommodate a rod type light source and a light exit surface that is away from the rear surface and which is for emitting the light from the light source and a transmittance adjuster unit that is provided on a side closer to the light exit surface, and which has a sheet type optical member capable of transmitting light and transmittance adjusters provided on at least one surface of the optical member. The transmittance adjusters at a position corresponding to a seam between adjacent light guide plate blocks are distributed at a different density than the transmittance adjusters at a position corresponding to a joint between adjacent light guide plate units.

Provided is an ink jet recording method including: discharging first ultraviolet curable ink of a radical polymerization reaction type which contains a radical photopolymerization initiator and a radical polymerization compound and in which transmittance at a wavelength of 395 nm is equal to or less than 1%, onto a recording medium; and curing the first ultraviolet curable ink which is landed on the recording medium by irradiating the ink with ultraviolet light, in which a light source which initially emits the ultraviolet light in the curing of the ink is an ultraviolet light emitting diode in which peak intensity of the irradiated ultraviolet light is equal to or more than 800 mW/cm².

Disclosed is a display device capable of compensating unevenness in brightness caused by physical restrictions of a display device or degradation in image quality caused by a partial reduction in contrast occurring in the local dimming technology using human visual characteristics. A liquid crystal panel (101) modulates illuminating light in accordance with the transmittance, and displays images on a screen. A backlight (102) emits the illuminating light to the liquid crystal panel (101) such that amounts of the illuminating light differ for each light emitting area of the screen. A backlight control unit (106) controls emission brightness of the backlight (102) for each light emitting area. A local gradation converting unit (104) performs gradation conversion on an image signal, and acquires a brightness value for each pixel after the conversion. A backlight driving unit (107) controls the transmittance for each pixel on the basis of the acquired brightness values after the conversion. The local gradation converting unit sets conversion characteristics for pixels to be processed in the image signal such that the brightness values of the pixels to be processed are low as the lightness of the periphery of the pixels to be processed is high, and performs gradation conversion using the set conversion characteristics.

An object of the invention is to provide a sidelight type backlighting apparatus having high brightness, which is yet reduced in uneven brightness, and to provide a reflector substrate having a surface profile necessary for obtaining such apparatus and a reflector having high brightness and long durability in which the reflector substrate is implemented. A buffer against strain is formed by providing space by protrusions or the like between a light guiding plate of a planar light source apparatus and a reflecting surface of a reflection sheet provided on one main surface of the light guiding plate. Further, a base layer, a metallic layer mainly containing silver, and a light transmitting oxide layer are laminated on the substrate in this order to form a reflection layer.

The present disclosure provides a method for calibrating brightness unevenness of an OLED display panel, the method includes: getting a brightness matrix of an OLED display panel in at least three gray scales, and determining a uniform brightness area and an uneven brightness area, and calculating a fitting Gamma value of each pixel corresponding to the at least three gray scales in the uneven brightness area, and fitting the fitting Gamma curve of the each pixel in the uneven brightness area, and calibrating the brightness of the uneven brightness area based on the fitting Gamma curve of the each pixel. The present disclosure can improve the accurate of the calibrating brightness and the efficiency of the calibration.

An LCD backlight (10) has a light source (12) that emits a laser light, a lens (21), a mirror (13), a rotary polygon mirror (14), a scanning lens (15) and a return mirror (16) constituting a transforming optical system that transforms the laser light from the light source (12) to a linear light, and a light guiding plate (17) that allows the linear light to enter and emits two-dimensional light in the horizontal direction. An emission end face (19) of the light source (12) is disposed in a rear face side of the light guiding plate (17) so that a surface normal line thereof is in the horizontal direction or is inclined downward from the horizontal direction, and the lens (21), mirror (13) and scanning lens (15) are disposed in the rear face side of the light guiding plate (17), so that surface normal lines of the light transmission surface and light reflection surface thereof are all in the horizontal direction or are inclined downward from the horizontal direction.

The invention discloses an LED-excited short wavelength infrared fluorescent microscopic imaging system. In the system, laser light emitted by a single-color LED passes through a collimating lens to be collimated firstly and is introduced into a light path of a microscope vertical illumination device, the exciting light is reflected with a dichroic beam combiner and converges onto a back focal plane of a microscopic objective, converging light forms parallel exciting light beams after passing through the objective and illuminates onto a sample, and a fluorescence probe in the sample is excitedto emit fluorescence; and a fluorescence signal passes through the objective, penetrates through the dichroic beam combiner and is finally received by a detection surface of an InGaAs camera to realize photoelectric conversion, and the signal is transmitted to a computer for data processing to obtain an imaged picture or a video. The LED-excited short wavelength infrared fluorescent microscopic imaging system has the remarkable advantages of high signal-to-noise ratio, high magnification, high resolution, capability of real-time imaging, capability of tomography, large penetration depth, small tissue damage and the like.

A display device includes lead lines that extend from a display area, and electrically connect video signal lines or scanning signal lines within a display area, and a driver circuit or a terminal portion that receives an output from the driver circuit; an insulating film that is formed in an upper layer of the lead lines and covers the lead lines; and a conductive film that is formed in an upper layer of the insulating film. The lead lines include a plurality of first lead lines that start from the driver circuit or the terminal portion, and arrive at the scanning signal lines or the video signal lines, and a plurality of second lead lines that are smaller in wiring resistance than the first lead lines. At least the first lead lines overlap with the conductive film through the insulating film.

A light source unit in which color reproduction range is widened and uneven brightness and color unevenness are less likely to occur is provided. The light source unit includes light source sets 21 each of which includes a first light source 22 and a second light source, and an LED board 27 on which the sets 21 are arranged. The first source 22 includes a first LED chip 23 configured to emit at least a color of light of red, green or blue and phosphors excited by the light to emit light, colors of which are different from the color of the light from the chip 23. The second source 26 is configured to emit at least a color of light of cyan, magenta or yellow. The first source 22A in one of the adjacent sets and the second source 26B in another one of the adjacent sets are arranged adjacent to each other in an arrangement direction in which the adjacent sets are arranged.

An illuminating device is mounted on top of or below a light steel frame and includes at least one one-piece elongated shade in which a bowl-shaped mirror reflector is mounted. A fluorescent tube is mounted in the shade and longer than one of a plurality of sections of the light steel frame. A wing extends horizontally from each of two lateral sides of the shade. An extrusion ridge is formed on a top side of the shade. Two shield boards are mounted in each section of the light steel frame extended across by the shade. An edge of each shield board rests on one of the wings. First and second snap fasteners are selectively engaged with the extrusion ridge. The first snap fastener can fix an electronic stabilizer on the extrusion ridge. The second snap fastener can fix the illuminating device to a longitudinal beam of the light steel frame.

The invention relates to a liquid crystal device, a manufacturing method of the liquid crystal device, and an electric device. The invention provides a liquid crystal device capable of inhibiting FFS mode of occurrence of friction disorder without increasing resistance of an electrode layer. On an element substrate (10) of the liquid crystal device (100), an upper layer side of a film transistor (30) is covered by an interlayer insulated film (6) made from an organic flattened film; on the upper layer of the interlayer insulated film (6), a common electrode (9a) is formed as an electrode layer of the whole surface. An inter-electrode insulated film (8) forms on the upper layer of the shared electrode (9a). A pixel electrode (7a) with a gap part (7b) with seam shaped forms on the inter-electrode insulated film (8). Compared to the common electrode (9a) on the whole surface, the pixel electrode (7a) with the gap part (7b) of seam shape has thin film thickness, so that the pixel electrode (7a) is capable of undergoing friction treatment appropriately.

A lighting device 10 according to this invention includes a light guide plate 16, a reflection sheet 21, and a light source unit LU. The light guide plate 16 is a plate-like member and includes a light entrance surface 16c through which light enters and a light exit surface 16a through which the light in the light guide plate 16 from the light entrance surface 16c exits. The reflection sheet 21 is arranged such that a front surface 21a thereof is on a rear plate surface 16b of the light guide plate 16 and such that an end portion 211 of the reflection sheet 21 is located more to an outer side than the light entrance surface 16c. The light source unit LU includes a light source board 18, a plurality of light sources 17, and a connector 19A configured to relay an electric power supply to the light sources 17. The light sources 17 and the connector 19A are mounted on the light source board 18 such that the light sources 17 are opposite the light entrance surface 16c and the connector 19A is located on a rear surface 21b side of the end portion 211 of the reflection sheet 21.