43results 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).

An anisotropic scattering sheet comprising at least an anisotropic light scattering layer, wherein the anisotropic light scattering layer comprises a continuous phase and a dispersed phase which are different in refraction index from each other, the mean aspect ratio of the dispersed phase is more than 1, and the major axis directions of each dispersed phase are oriented to a given direction, and wherein the sheet is a heat-treated sheet. In the treatment, the heat-treating temperature may be not less than 70° C., and in the typical treatment, heat-treatment is conducted after the sheet is oriented by a monoaxial stretching through roll calendaring. The present invention ensures to provide an anisotropic scattering sheet stably usable for a long period of time without causing luminance unevenness.

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.

A backlight assembly including a lamp having a lamp tube and first and second conductive members, a container body exposing the lamp tube while covering the first and second conductive members, a power-supplying means receiving the first and second conductive members and providing them with power, and a light uniformity improving means. A liquid crystal display panel assembly is coupled to the backlight assembly so as to display a picture by controlling a transmittance of the light passing through the light uniformity improving means.

A light-emitting device includes: a plurality of light-emitting elements whose luminous energy is controlled according to a current value and a pulse width of a driving signal; a storage unit that stores first and second coefficients for every light-emitting element; a pulse width determining unit that determines the pulse width of the driving signal supplied to each light-emitting element on the basis of the first coefficient for the corresponding light-emitting element stored in the storage unit and a grayscale value designated for the corresponding light-emitting element by grayscale data; a current value determining unit that determines a current value of the driving signal supplied to each light-emitting element on the basis of the second coefficient for the corresponding light-emitting element stored in the storage unit; and a driving unit that supplies the driving signal having the current value determined by the current value determining unit within the pulse width determined by the pulse width determining unit to the corresponding light-emitting element. In the light-emitting device, a variation in the light emission characteristic of each light-emitting element when the pulse width is changed and the current value of the driving signal is fixed is different from a variation in the light emission characteristic thereof when the current value is changed and the pulse width of the driving signal is fixed, and the first and second coefficients stored in the storage unit are selected so that the peak light amount of the individual light-emitting elements when the same grayscale value is designated by the grayscale data are almost equal to one another and variations in the light emission characteristics of the plurality of light-emitting elements driven by the driving signals from the driving unit are substantially equal to one another.

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.

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.

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.

The invention relates to an OLED (Organic Light Emitting Diode) pixel compensation circuit and an OLED pixel compensation method, seven thin film transistors, one compensation capacitor and one organic light emitting diode are adopted to form a 7T1C framework, and the driving time sequence of pixels is sequentially divided into four stages of resetting, compensation, data storage and light emitting. As the seventh thin film transistor is in a closed state in the reset, compensation and data storage stages, the organic light emitting diode does not emit light, and the seventh thin film transistor is in an open state in the light emitting stage, the current flowing through the organic light emitting diode is irrelevant to the threshold voltage and the driving voltage of the organic light emitting diode. By adopting the technical scheme, not only can threshold voltage drift of the driving thin film transistor be effectively compensated, but also brightness change caused by electrical deterioration of the organic light-emitting diode can be compensated, and the display quality of the organic light-emitting diode is improved.

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.

The invention discloses an aurora motion characterization method for an unsupervised deep optical flow network, and the method comprises the implementation steps: 1, taking two adjacent preprocessed all-sky aurora images as input, and calculating a bidirectional optical flow through an optical flow network; 2, calculating a bidirectional warping image by using the all-sky aurora image and the bidirectional light flow; 3, reasoning a bidirectional deformation graph by using the bidirectional optical flow; 4, constructing a loss function by using the all-sky aurora image, the warping image and the bidirectional deformation image so as to optimize and train the optical flow network; and 5, after the training is completed, extracting a pixel-level aurora optical flow field of the aurora observation video by using the optical flow network as an aurora motion representation. The method solves the problem that the aurora data does not meet the brightness consistency assumption of the optical flow and lacks training data, has the advantages of high precision and strong robustness, and can be used for performing aurora event identification and detection from a complex aurora observation video.

The invention discloses a white LED step-up conversion system. The white LED step-up conversion system is characterized by mainly comprising a processing chip U, a diode D1, a field effect tube MOS, a constant current output circuit, an inductor L1 and the like, wherein the constant current output circuit is connected with a VOUT pin of the processing chip U; and one end of the inductor L1 is connected with an N electrode of the diode D1 and the other end passes through a resistor R5 and then is connected with a drain of the field effect tube MOS. A TPS61200 integrated chip is originally combined with a novel peripheral circuit, so that the condition that the 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; and different white LEDs are consistent in brightness.

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.