479results about How to "Improve uniformity of light emission" patented technology

A light emitting device includes a carrier, a light emitting element electrically connected to the carrier, a transparent plate having at least one through hole formed therein and including a flat-portion and a lens-portion and a permeable membrane structure disposed on a surface of the transparent plate. The lens-portion covers the light emitting element and has a light incident surface, a light emitting surface, a first and a second side surfaces. A first partial beam of the light beam passes through the light incident surface and leaves from the light emitting surface. A second partial beam of the light beam passes through the light incident surface and is transmitted to the first or the second side surface. The first or the second side surface reflects at least a part of the second partial beam of the light beam to be passed through the light emitting surface.

The invention discloses a full-spectrum LED light source. The full-spectrum LED light source comprises a substrate, an LED chip packaged on the substrate and fluorescent glue used for packaging the LED chip, wherein the fluorescent glue is formed by silica gel and fluorescent powder in a mixed manner; the fluorescent powder consists of yellow powder with the emission peak wavelength of 550-565nm, blue-green powder with the mission peak wavelength of 485-495nm, green powder with the mission peak wavelength of 515-525nm, yellow-green powder with the mission peak wavelength of 530-540nm and red powder with the mission peak wavelength of 650-660nm; and the weight ratio of the yellow powder to blue-green powder to green powder to yellow-green powder to red power is 1 to (0.1-0.5) to (0.2-0.4) to (0.15-1.2) to (0.08-0.5). By adoption of the full-spectrum LED light source, the LED light source spectrum can be closer to the solar spectrum, so that the full-spectrum LED light source is high in color rendering, and the color temperature of the full-spectrum LED light source is within the ideal solar light range.

A nitride semiconductor light-emitting device includes at least one n-type semiconductor layer, an active layer and at least one p-type semiconductor layer within a rectangle nitride semiconductor region on a substrate. The n-type semiconductor layer has a partial exposed area, a p-side branch electrode integral with a p-side electrode pad formed on a current diffusion layer formed on the p-type semiconductor layer, an n-side branch electrode integral with an n-side electrode pad formed on the partial exposed area of the n-type semiconductor layer, the p-side and n-side branch electrodes extend parallel to each other along two opposite sides of the semiconductor region, and conditions of 0.3<M/L<1.1 and L<L_max are satisfied; L is the distance between centers of the p-side and n-side electrode pads, M is the distance between the p-side and n-side branch electrodes, and L_max represents a distance between the centers of the p-side and n-side electrode pads.

The invention discloses a pixel circuit as well as a driving method, a display panel and a display device thereof. The pixel circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a driving transistor, a first capacitor, a second capacitor and a light-emitting element, through the cooperating driving between all transistors and the two capacitors, the driving current is enabled to be unrelated to the threshold voltage of the driving transistor and the step voltage of the two ends of the light-emitting element finally. According to the pixel circuit as well as the driving method, the display panel and the display device thereof, the influence of undesirable factors is eliminated, the problem that the conventional display device is uneven in light emission is further improved effectively, and the uniformity of luminance and the display effect of the display device are improved.

The present invention discloses a quantum dot luminescent layer and device, and preparation methods thereof, a luminescence module and a display device. The preparation method of the quantum dot luminescent layer comprises the steps: the quantum dots having the surfaces coated with ligand are dissolved in solvent to obtain the quantum dot solution; the quantum dot solution is deposited on the substrate or a function layer by employing the solution method to obtain a quantum dot luminescent layer; the quantum dot luminescent layer is arranged in a vacuum cavity, and organic metal compounds are pumped in to process for 0.5-30 mins, wherein the pressure in the cavity is 0.01-1mbar, the partial pressure of the organic metal compounds after gasification is 0.001-0.1mbar, the temperature in the cavity is 10-25 DEG C; and the quantum dot luminescent layer is taken out to obtain the quantum dot crosslinking luminescent layer. The quantum dot film is not only uniform flat and has a stable film, so that the quantum dot film is difficult to be redissolved to take away or wash away by the solvent when the subsequent other function layers are deposited so as to effectively improve the luminescence uniformity and the stability of the QLED.

An inter-layer bridging connection is provided in an organic light emitting display and a method of manufacturing the same is provided. The organic light emitting display device is subdivided into a major interior, first region I, an auxiliary power coupling region II and a peripheral power line region III where the second region (II) extends at least partially around the first region, and the third region (III) extends at least partially around the second region. Additionally, the display device includes a substrate, a first electrode, a second electrode, an interposed light emitting structure, a power line, a conductive pattern and an auxiliary electrode. The first electrode and the light emitting structure are both disposed in the first region. The power line is disposed in the third region. The second electrode is at least partially transparent and is disposed in the first region and extends into the second region (II). The conductive pattern electrically connects the second electrode with the power line. The auxiliary electrode has reduced resistivity per unit area and directly contacts the second electrode. The auxiliary electrode is disposed in the second region.

The invention discloses a gray scale display driving method and device for an LED display. The gray scale display driving method comprises the steps that all the n data bits of a gray scale datum are divided into m subframes, wherein n is an integer larger than or equal to 2, and m is an integer larger than or equal to 1; the preset weight C of each subframe is calculated; the weights of all the n data bits are established so that the combination of the weights can represent all gray scales; all the n data bits are combined into m subframes to enable the weight of each subframe is approximately equal to the preset weight of the corresponding subframe; the corresponding data bit of each subframe is displayed. The gray scale display driving method and device for the LED display can ensure uniformity of luminance on the premise that the refresh rate of a display system is increased, and then the display effect is improved.

The invention discloses a preparation method of a luminescent polyamide composite material. The method comprises the following steps of (1) preparing a graphene/red-light phosphor/SiO2 composite material; (2) weighing the following materials in parts by weight: 60 to 70 parts of nylon resin, 30 to 40 parts of hybrid glass fiber reinforcement, 1 to 5 parts of nylon master batch, 1 to 5 parts of graphene/red-light phosphor composite material and 0.1 to 0.3 part of antioxygen; extruding the materials by a double-screw extruder and pelleting, wherein the hybrid glass fiber reinforcement is added through a side-feeder, the screw speed of the double-screw extruder is 120 to 150r/min, the temperature is 265 to 280 DEG C, and then the polyamide composite material is obtained. The preparation method of the luminescent polyamide composite material can enhance the dispersity and the luminance uniformity of phosphor in the luminescent polyamide composite material, and the high luminescent intensity is obtained.

The invention discloses a III-group nitride light-emitting diode (LED) and a manufacturing method thereof. The LED comprises a substrate and a semiconductor epitaxial laminate which is laminated on the substrate, wherein the semiconductor epitaxial laminate sequentially comprises an N type layer, a luminescent layer and a P type layer from top to bottom. The LED is characterized in that: an N type layer table face is formed in the N type layer by etching a part of the semiconductor epitaxial laminate; an N type electrode is arranged on the N type layer table face; a P type electrode is arranged on the upper surface of the un-etched part of the P type layer; the N type layer also comprises a uniformly doped layer of which the doping concentration is consistent and a modulation doped layer of which the doping concentration is changeable; and the modulation doped layer is arranged between the uniformly doped layer and the luminescent layer. A doped mode of the modulation doped layer is gradual transition doping which connects uniformly doped layer and the luminescent layer of which the doping concentration is consistent. The concentration change trend is decrease progressively change from the uniformly doped layer to the luminescent layer. By the LED and the manufacturing method, the crystal quality and the luminance uniformity can be obviously improved, and the lighting effect is improved.

The invention discloses a pixel circuit and a display device. The pixel circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a driving transistor, a first capacitor, and a second capacitor. According to the pixel circuit and the display device, the driving current and the driving transistor are finally prevented from being influenced by threshold voltage via cooperative driving of the transistors and the two capacitors, the influence of adverse factors is eliminated, the problem of non-uniform light emission of the display device is effectively improved, and the light-emitting uniformity and the display effect of the display device are improved.

An illumination device using white light as illumination source includes a semi-conducting chip, base and lens with cavum filled in photo-transmission material. The lens are fixed on the chip top and separated with the chip. By using lens it could effectively reduce excitation wavelength excursion, quanta efficiency decrease and aging raised by chip heat radiation. The illuminating rate, color temperature, chroma and coincidence of illumination device are improved.

The invention provides an OLED display device, and relates to the technical field of display. The OLED display device solves the problem that an existing OLED sub-pixel is uneven in light-emitting brightness. The OLED display device comprises an array substrate and a package substrate which are packaged together, the array substrate comprises a first electrode layer, a second electrode layer and a light-emitting function layer located between the first electrode layer and the second electrode layer. The first electrode layer comprises a plurality of pixel electrodes which do not make contact with one another. The OLED display device is characterized in that the second electrode layer comprises a plurality of second electrodes which do not make contact with one another, and each second electrode corresponds to at least one pixel electrode. The display device further comprises transmission leads, and each transmission lead corresponds to one second electrode so as to input electric signals into the corresponding second electrode.

The invention belongs to the technical field of photoelectron and particularly relates to an organic electroluminescence device for reducing patterning graphene electrodes based on laser and a manufacturing method for the organic electroluminescence device. The organic electroluminescence device consists of a substrate, a gold electrode, the micron-dimension patterning graphene electrodes, an organic function layer and a cathode in sequence, wherein the gold electrode serves as an extraction electrode and is in a channel structure, the micron-dimension patterning graphene electrodes are lapped on the gold electrode at the two sides of each channel, and the micron-dimension patterning graphene electrodes are prepared by a laser write-through machining system capable of realizing laser point-by-point scanning. The obtained graphene electrodes are lower in the surface roughness and smoother in the surface, and therefore, the bottom-emission organic electroluminescence device prepared by the electrodes are higher in the degree of light-emitting homogeneity. The organic electroluminescence device and the manufacturing method break through the conventional concept for manufacturing the original large-area devices, the areas of the electrodes are reduced to the micron dimension, and patterns are led into the electrodes, so that the light-emitting area of the device is in a miniaturized pattern structure, thereby combining the organic electroluminescence device and the laser micro-nanomachining skillfully.

The present invention provides a light emitting device with a beveled reflector and a manufacturing method of the same. The light emitting device includes an LED semiconductor die, a photoluminescent structure and a reflector. The photoluminescent structure is disposed on the LED semiconductor die, the side surface of the photoluminescent structure is beveled , and a lower surface of the photoluminescent structure adheres to an upper surface of the LED semiconductor die. The reflector wraps the side surface of the LED semiconductor die, and the side surface of the photoluminescent structure is beveled. A method to manufacture the above light emitting device is also disclosed. Advantages of this light emitting device with beveled reflector include increasing the light extraction efficiency, making the viewing angle tunable, improving spatial color uniformity and reducing the light source etendue realized in a compact form-factor size.

An electroluminescent device comprises a substrate, a pixel array, a plurality of lead groups, a plurality of driving devices and at least one power supply transmission pattern, wherein the substrate comprises a display area and a peripheral circuit area arranged on the periphery of the display area; the pixel array is arranged in the display area of the substrate and provided with a plurality of pixel structures, each pixel structure contains at least one active element and at least one light-emitting element which is electrically connected with the active element; the lead groups are arranged in the peripheral circuit area of the substrate and are electrically connected with the pixel array, wherein each lead group contains a plurality of leads; each driving device is electrically connected with one lead group; and the power supply transmission pattern is arranged in the peripheral circuit area of the substrate and positioned between adjacent two lead groups, wherein one end of the power supply transmission pattern is electrically connected with the light-emitting element of the pixel array and the other end of the power supply transmission pattern is electrically connected with the corresponding driving device.

The invention relates to a pixel circuit, a control method thereof, a display panel and a display device. The pixel circuit includes a transistor T1, a transistor T2, a transistor T3, a transistor T4,a transistor T5, a transistor T6, a transistor T7, a transistor T8, a transistor T9, a capacitor C1, and a light emitting diode D1. The pixel circuit uses a second reference voltage Vref2 to compensate a control terminal of the transistor T1 through the capacitor C1 so as to make a driving current flowing through the transistor T1 is related to the second reference voltage Vref2 and independent of first power supply VDD. Since the driving current flows through a power supply line, when the driving current is independent of first power supply VDD, current-resistance voltage drop on the power supply line has no effect on the driving current, thereby improving the illumination uniformity of a screen.