41results about How to "Avoid Brightness Variations" patented technology

The present invention provides a display device with reduced power consumption and that reduces changes in luminance, and perceptibility of flicker, and a driving method thereof. A display device according to an exemplary embodiment comprises: a display panel configured to display a still image and a motion picture; a signal controller configured to control signals for driving the display panel; and a graphics processing unit configured to transmit input image data to the signal controller, wherein the signal controller comprises a frame memory configured to store the input image data, and the display panel is driven at a first frequency when the motion picture is displayed and the display panel is driven at a second frequency that is lower than the first frequency when the still image is displayed.

A liquid crystal display device having includes a light guide plate having a surface thereof serving as an illuminating surface region opposite to a liquid crystal display panel, light sources mounted on a flexible printed-circuit board and provided on a side face of the light guide plate, an optical sheet member interposed between the liquid crystal display panel and the light guide plate. The side surfaces of the light guide plate with the light sources provided thereon have a ridge-like inclined surface formed thereon, when viewed from the illuminating surface, and the ridge-like inclined surfaces serve as a light-receiving surface with the light source arranged thereon.

A container receives lamps each having a lamp tube and a conductive member. The container includes a container body exposing the lamp tube and covering the conductive member, and a clip type power-supply unit holding the conductive member in a clip-coupling manner so that the container securely receives the lamps. The clip type power-supply unit supplies power to the conductive member. The clip type power-supply unit has a conductive base body coupled to the container body, a clip body protruded perpendicularly from the conductive base body, and a clip section protruded from the clip body to grip the conductive member. The container also has a shock absorbing member disposed between the container body and the clip type power-supply unit.

The invention provides a light-emitting device which is capable of applying light to a display panel with uniformity in brightness and can be made lower in profile. A light-emitting device (11) includes an LED chip (111a), a base support (111b) which supports the LED chip (111a), and a lens (112) disposed in contact with the LED chip (111a) so as to cover the LED chip (111a) and the base support (111b). The lens (112) has first curved sections (1122) which reflect light that has reached a top surface (112a) so that the reflected light is emitted from a side surface (112b), and second curved sections (1123) which refract light that has reached the top surface (112a) to outside so that the refracted light is emitted from the top surface (112a).

A first current mirror circuit including an input side transistor, an output transistor and passive elements respectively connected in series with said input side transistor and said output side transistor, temperature coefficients of said passive elements being opposite in characteristics and a second current mirror circuit provided as a load circuit of the first current mirror circuit, for feeding back an output current of the output side transistor to an input of the input side transistor are provided. A drive current is generated on a basis of a current corresponding to a current generated in the output side transistor as a reference current and an operating current ratio of the input side transistor and the output side transistor is selected such that luminance change of organic EL elements with respect to temperature change is restricted.

A display device capable of reducing power consumption and preventing luminance changes, and a driving method thereof are provided. The display device includes: a display panel displaying a still image and a motion picture; a signal controller controlling signals for driving the display panel; a graphic processing unit transmitting input image data to the signal controller; a light source unit irradiating the display panel with light; and a light source driver controlling signals for driving the light source unit, in which the signal controller includes a frame memory storing the input image data and controls the display panel so as to be driven at a first frequency or a second frequency, and the light source driver drives the light source unit at a first ratio when the display panel is driven at the first frequency and at a second ratio when the display panel is driven at the second frequency.

Disclosed is a method for manufacturing an organic EL display, which comprises: a step of preparing an organic EL panel that comprises a substrate and organic EL elements arranged as a matrix on the substrate, wherein each organic EL element has a pixel electrode arranged on the substrate, an organic layer arranged on the pixel electrode, a transparent counter electrode arranged on the organic layer, a protective layer arranged on the transparent counter electrode, and a color filter arranged on the protective layer, and a defect portion present in the organic layer in each organic EL element is detected; a step of destroying a region of the transparent counter electrode positioned above the defect portion by irradiating the region with laser light through the color filter; and a step wherein a region of the color filter positioned above the defect portion is removed.

Disclosed is a cold cathode lamp composed of discharge tube having a glass tube and an internal electrode, and a ballast capacitor integrally mounted to the discharge tube. The ballast capacitor is composed of a first electrode formed on the outer surface of the discharge tube, a dielectric layer covering the first electrode, and a second electrode formed on the dielectric layer. The internal electrode and the first electrode are electrically connected with each other. At least one of the internal electrode and the first electrode has a portion exposed to the outside. The capacitance of the ballast capacitor can be measured by connecting the exposed portion and the second electrode to a measuring device. Consequently, variations in capacitance of the ballast capacitor, which cause variations in luminance of the cold cathode lamp, can be easily examined.

An imaging apparatus that images a photographic subject using an imaging device includes: a signal processing means for performing signal processing on an image signal of the photographic subject imaged by the imaging device and generating an exposure control signal; a photoelectric conversion device that detects an amount of light indicating the brightness under an environment where the brightness changes periodically; and a timing generating means for receiving the exposure control signal from the signal processing means when the amount of light detected by the photoelectric conversion device reaches a predetermined value set beforehand and generating a timing signal for start of exposure and then supplying the timing signal to the imaging device.

The invention discloses a frequency compensation circuit-based current protection-type white LED step-up conversion system. The frequency compensation circuit-based current protection-type white LED step-up conversion system is characterized by mainly comprising a processing chip U, a diode D1, a field effect tube MOS, a frequency compensation circuit and a constant current output circuit, wherein the frequency compensation circuit is connected with an L pin of the processing chip U; and the constant current output circuit is connected with a VOUT pin of the processing chip U. A TPS61200 integrated chip is originally combined with a novel peripheral circuit, so that the condition that the frequency compensation circuit-based current protection-type white LED step-up conversion system can output constant current is ensured; constant current driving is provided for white LEDs; brightness changes of the white LEDs caused by a voltage change are avoided; a plurality of white LEDs are consistent in brightness; surge current generated at the power-on moment can be embedded within the permitted range; the constant current is output; and the white LEDs are prevented from being damaged by the surge current. Meanwhile, the oscillating phenomenon in the system can be eliminated; and the stability of the frequency compensation circuit-based current protection-type white LED step-up conversion system is greatly improved.

The invention discloses an overvoltage protection white light LED (Light-Emitting Diode) boost conversion system based on a frequency compensating circuit. The overvoltage protection white light LED boost conversion system is characterized by mainly consisting of a processing chip U, a diode D1, a field effect transistor MOS (Metal Oxide Semiconductor), a frequency compensating circuit and a constant-current output circuit, wherein the frequency compensating circuit is connected with an L pin of the processing chip U; and the constant-current output circuit is connected with a VOUT pin of the processing chip U. In the boost conversion system, a TPS61200 integrated chip is creatively combined with a novel peripheral circuit, so that constant current can be output; constant-current driving is provided for a white light LED; brightness change of the white light LED caused by voltage change is avoided; and the brightness of a plurality of white light LEDs is kept consistent. The overvoltage protection white light LED boost conversion system can be shut down automatically under overvoltage, so that the white light LED is protected from being damaged by the overvoltage. Meanwhile, the phenomenon of oscillation in the system can be avoided, and the stability of the overvoltage protection white light LED boost conversion system is enhanced greatly.

An image processing apparatus comprises a first acquisition unit configured to acquire an image shot by continuous shooting while emitting a flash; a second acquisition unit configured to acquire light emission information of the flash in the continuous shooting; a detection unit configured to detect a light emission variation of the flash based on the light emission information; a setting unit configured to set a parameter of a virtual light source for correcting a variation of brightness of the image shot by the continuous shooting due to the light emission variation based on a result of detecting the light emission variation; and a correction unit configured to correct the image shot by the continuous shooting based on the set parameter of the virtual light source.

A planar lighting device according to an embodiment includes: a light guide that has flexibility and receives light from a side surface and emits the light from a light-emitting surface; a light source disposed close to the side surface and emits light that enters the side surface; a first frame having a curved shape and having an aperture; a second frame having a curved surface for sandwiching the light guide between the first frame and the curved surface such that the light-emitting surface faces the aperture; and an optical sheet disposed close to the light-emitting surface with at least a part of an edge portion of the optical sheet being disposed in a space defined by the first frame and the light guide, the part being separated from the first frame.

(Object) To prevent the chromaticity from changing due to the gradation in a display system for improving the blurring in an animated image where one frame is formed of two fields having different brightness.

(Means for Achieving Object) According to a driving method for improving the properties of an animated image by dividing one frame into a bright field having high brightness and a dark field having low brightness where an image is displayed in the case where the gradation of the image is 190 or greater, a change in the chromaticity is great in the dark field. In order to solve this problem, the gradation properties for blue are corrected only in the dark field. The gradation properties of one color which is greatly effective on the chromaticity are changed only for the necessary gradation, and therefore, the chromaticity properties can be improved while preventing the gradation-brightness properties from being affected.