47results about How to "Variation in brightness" patented technology

A lens barrel and imaging device advantageous for making unnatural brightness variation in an image, due to a liquid-crystal light control element, less noticeable, while reducing the size of an optical system, are disclosed. A lens barrel comprises an optical system, a rectangular planar liquid-crystal light control element, and an imaging element. An object image captured by the optical system is guided to the imaging element through the control element comprising a liquid crystal layer sealed in between a pair of alignment layers and containing rod-shaped liquid crystal molecules. A sensor unit of the imaging element has a rectangular imaging area. Light rays guided from the optical system to the imaging element diverge away from an optical axis. An orientational direction of the control element is substantially parallel to the shorter sides of the imaging area.

A plurality of first refraction surfaces 121 and a plurality of second refraction surfaces 122 are alternately provided on an emission surface of a lens element 120 so as to form concentric circles each having an optical axis 113 at the center thereof, and having diameters different from each other, and a light reflected by a plurality of reflection surfaces 123 provided on an incident surface of the lens element so as to form concentric circuits each having the optical axis 113 at the center thereof and having diameters different from each other, is refracted and emitted by the plurality of second refraction surfaces 122 at desired angles. Therefore, it is possible to enhance efficiency and an emission intensity, and reduce variations in brightness of an emitted light without increasing the diameter of the lens element 120, thereby realizing a light emitting module 100 enabling advantageous performance.

A backlight device is divided into multiple regions, and has a configuration in which light emitted from a light source of each of the regions is allowed to leak to other regions. A maximum gradation detector detects a maximum gradation of a regional image signal displayed on each of the regions of the liquid crystal panel. An image gain calculator obtains a gain to be multiplied to each regional image signal. An emission luminance calculator obtains an emission luminance of light to be emitted by each light source, by using an operation expression according to the emission luminance of light to be emitted by the backlight device. At this time, if the emission luminance takes a negative value as a result of calculation, the emission luminance calculator makes a correction so that the emission luminance can take a value equal to or greater than 0.

A backlight device includes a light source (21) arranged in a casing (23) opened in a light radiating surface (20a), so that the light source faces the light radiating surface (20a) and radiates light towards the light radiating surface (20a), a light transmitting reflecting plate (25) arranged in the casing for delimiting a space inclusive of the light source (21) and adapted for transmitting a fraction of the incident light and for reflecting another fraction of the incident light, and a light transmitting diffusing plate (41) arranged on the light radiating surface (20a) of the casing (23) for diffusing the light transmitted through the light transmitting reflecting plate (25) and for causing surface light radiation. A light reflecting surface (24) is formed on the inner surface of the casing (23). A portion of light radiated by the light source (21) is internally reflected by the light transmitting reflecting plate (25) and by the light reflecting surface (24), in a space delimited in the casing (23) by the light transmitting reflecting plate (25), after which the light portion is transmitted through the light transmitting reflecting plate (25).

An electro-optical device includes a scan line, a data line, a pixel circuit provided at an intersection of the scan line and the data line, a first high potential line, a first low potential line, a second high potential line, and a second low potential line. The pixel circuit includes a light emitting device, a memory circuit disposed between the first high potential line and the first low potential line, a first transistor of N-type including a gate electrically connected to the memory circuit, and a second transistor disposed between the memory circuit and the data line. The light emitting device and the first transistor are disposed in series between the second high potential line and the second low potential line.

A passive-matrix display of the disclosure includes a first electrode disposed over a substrate, a second electrode disposed over the first electrode and three-dimensionally intersecting the first electrode, a first auxiliary electrode disposed between the substrate and the first electrode, three-dimensionally intersecting the first electrode and being parallel to the second electrode, and a second auxiliary electrode parallel to the first auxiliary electrode and to the second electrode, the first electrode and the first auxiliary electrode being electrically connected by a first connection portion, and the second electrode and the second auxiliary electrode being connected by a plurality of second connection portions each disposed with at least one of the first electrodes therebetween. The passive-matrix display enables voltage drop and variation in brightness to be reduced by lowering the wiring resistance of the second electrode.