65results about How to "Uniform color temperature" patented technology

There is provided a display device including a display unit having pixels, each of which includes a luminescence element for individually emitting light depending on a current amount and a pixel circuit for controlling a current applied to the luminescence element according to a picture signal, scan lines which supply a selection signal for selecting the pixels to emit light to the pixels in a predetermined scanning cycle, and data lines which supply the picture signal to the pixels, the pixels, the scan lines, and the data lines arranged in a matrix pattern, the display device including: a luminescence amount detector for inputting a picture signal with a linear characteristic to detect a luminescence amount from the picture signal; a luminescence time calculator for calculating a luminescence time for the luminescence element based on the luminescence amount detected by the luminescence amount detector; a luminescence time recorder for recording the calculated luminescence time; a luminance acquirer for acquiring luminance information of the luminescence element by use of the luminescence time recorded in the luminescence time recorder; a coefficient calculator for calculating a coefficient by which the picture signal is multiplied, based on the luminance information acquired by the luminance acquirer; and a coefficient multiplier for multiplying the picture signal by the coefficient calculated by the coefficient calculator.

A light-emitting-diode backlight device includes a light source substrate to which many light-emitting diodes are mounted, and a bottom chassis having the light source substrate mounted to a principal surface side of the bottom chassis. Illumination light from the light-emitting diodes is supplied to a display panel unit. A back-surface side of the bottom chassis is provided with a heat-dissipating unit making uniform a temperature distribution over the entire bottom chassis. The heat-dissipating unit includes a mounting plate, a heat pipe, and a radiating fin. The mounting plate is mounted to at least a high-temperature area of the bottom chassis. The heat pipe is disposed on both the high-temperature area and a low-temperature area, and is mounted to the mounting plate. The radiating fin is mounted to the low-temperature area, and connected to an end of the heat pipe.

The invention discloses a backlight adjustable light display device, which comprises a box body, wherein a plurality of light sources connected to an electric control device are distributed on a backlight board at the back of the box body; a light-transmitting panel is arranged in the front of the box body; the light sources include multiple groups of branches which are distributed orderly; each branch is formed by connecting at least two light sources and an adjusting module in series; and the various groups of the branches are mutually connected in parallel and are connected to the electric control device, wherein the adjusting modules are adjustable resistors or capable of adjusting current or PWM (pulse width modulation) of the branches by virtue of chips; and the light sources are LED light sources. Compared with the prior art, the light display device disclosed by the invention can improve the service life of a backlight, and can synchronize luminance attenuation of the various light sources by virtue of the adjusting modules added in the branches, so that the problem of the prior art which is asynchronous in luminance attenuation is solved; by regulating the current, voltage or WPM of light-emitting elements in the branches, brightness and color temperature are uniform and change in darkness is avoided after newly installing and changing the light sources. The light display device is applicable to all light box advertising and soft membrane ceiling box bodies.

The invention discloses a white LED device of uniform illuminant color temperature at the spatial solid angle and a packaging method of the LED device. The white LED device comprises an LED support with a reflector lamp cup, the reflector lamp cup is internally provided with an LED chip, and a rotary table structure is arranged on the LED support; and the rotary table structure is formed by fitting a lower layer planar concave lens layer and an upper layer planar convex lens layer. The invention also provides a packaging method of the white LED device. The planar concave lens layer is conducive to increasing the light emitting divergence angle of the LED, and the inverted planar convex lens is also conducive to increasing the light emitting divergence angle of the LED, so that white light which is highly uniform in the divergence angle range of a stereo space can be obtained; and the lower-layer planar concave lens layer and the upper-layer planar convex lens layer can be packaged by high-refraction silica gel and low-reflectivity silica gel respectively, and the gradient index structure from the chip to the external air layer is conducive to improving the extraction rate of emitted light of the white LED device.

The present invention is directed to the provision of an LED light source that can easily adjust its chromaticity and a chromaticity adjustment method for such an LED light source. More specifically, the invention provides a chromaticity adjustment method for an LED light source having an LED device, a phosphor which absorbs a portion of light emitted from the LED device and emits light by wavelength conversion, and a resin material containing the phosphor and disposed so as to enclose the LED device, wherein an ink coating layer is disposed on a surface of the resin material in order to adjust chromaticity; the invention also provides an LED light source adjusted in such a manner.

The invention discloses a white light source based on a laser, an optical fiber and a light-emitting component, and a light-emitting component manufacturing method, and relates to a white light source and the manufacturing method of a light-emitting component thereof. The manufacturing method of the light-emitting component comprises the following steps of: firstly, etching or engraving the optical fiber, and then solidifying and coating fluorescent powder on the surface of the etched or engraved optical fiber. The white light source based on the laser, the optical fiber and the light-emitting component comprises the laser, the transmission optical fiber and the light-emitting component; the laser is connected with the light-emitting component via the transmission optical fiber. The white light source reduces the loss of light beams during the transmission from the transmission optical fiber to the light-emitting component, facilitates the realization of a linear light source, can separately allocate the laser and the light-emitting component, can install the light source flexibly, ensures that the light-emitting efficiency of the light-emitting component will not be affected by the heat dissipated by the laser, solves the problem that heat dissipation affects light-emitting efficiency, and improves the light-emitting efficiency of the light source, thus the light beams emitted by the light source have uniform color temperature and a high color development index.