2076results about How to "Uniform brightness" patented technology

An LED area illumination source/display (10) such as an electronic billboard is made up of a number of individual pixels with each pixel including a number of LEDs, e.g., a red (18), blue (19) and green LED (20), with each LED representing a primary color being arranged to be energized separately. At least one light sensor (22) is incorporated into the display for providing a measure of the light emitted from each LED representing a primary color in each pixel. The source/display (10) is susceptible of being self-calibrated by initially energizing the LEDs (18, 19, 20) at less than a maximum level and increasing the energization level as necessary during use to restore the original light output of degraded LEDs.

PCT No. PCT/EP96/05140 Sec. 371 Date Apr. 23, 1998 Sec. 102(e) Date Apr. 23, 1998 PCT Filed Nov. 21, 1996 PCT Pub. No. WO97/19206 PCT Pub. Date May 29, 1997The invention relates to a method for the electrolytic deposition of metal coatings, in particular of copper coatings with certain physical-mechanical and optical properties and uniform coating thickness. According to known methods using soluble anodes and applying direct current, only uneven metal distribution can be attained on complex shaped workpieces. By using a pulse current or pulse voltage method, the problem of the coatings being of varying thickness at various places on the workpiece surfaces can indeed be reduced. However, the further problem of the geometric ratios being changed continuously during the depositing process by dissolving of the anodes is not resolved thus. This can be avoided by using insoluble anodes. In order to guarantee sufficient stability of the anodes and a bright coating even at those points on the workpiece surfaces, onto which the metal is deposited with high current density, it is essential to add compounds of an electrochemically reversible redox system to the depositing solution.

An organic light emitting display including a scan signal line forwarding a scan signal, a data line sending a data signal and a pixel coupled to the scan signal line and the data line, the organic light emitting diode display, wherein the pixel includes a first switching transistor transmitting a data signal from the data line in response to the scan signal of the scan signal line, a driving transistor, coupled to the first switching transistor, controlling driving current from a first power source line, a storage capacitor coupled between the driving transistor and the first power source line, an organic light emitting diode, coupled between the driving transistor and a second power source line, displaying an image with the driving current controlled by the driving transistor, an initial switching transistor, coupled between the storage capacitor and an initial power source line, initializing the storage capacitor, and a switching transistor for applying a reverse bias, coupled between the second power source line and the initial power source line, applying a reverse bias voltage to the organic light emitting diode.

An Organic Light Emitting Display (OLED) that is capable of decreasing the number of output lines for a data driver using a demultiplexer, displaying an image with uniform brightness, and adjusting white balance includes: a plurality of red, green and blue sub-pixels, and each sub-pixel is provided with an auxiliary capacitor to compensate a decreased driving voltage. The respective auxiliary capacitors are different in capacitance according to emission efficiency of the red, green and blue sub-pixels. The auxiliary capacitor of the green sub-pixel has a larger capacitance than the auxiliary capacitor of the red sub-pixel, and the auxiliary capacitor of the red sub-pixel has a larger capacitance than the auxiliary capacitor of the blue sub-pixel. This enables the white balance to be adjusted with the same data voltage.

A mold part formed of a light transmitting material having a high refractive index is molded in a concave-shaped reflecting member, and a light emitting element such as an LED chip or the like is inserted in the center of the mold part. A circular direct emitting portion is provided at the center of a front face of the mold part, a ring-shaped total reflecting portion is provided around it, and a slanted total reflecting portion is provided between the direct emitting portion and total reflecting portion. Thereby, the uniformity of front face luminance with a simple structure in a light emitting device provided with a reflecting member on a back face of a mold part is improved.

An organic light emitting display (OLED) is provided. The OLED includes data line capacitors, which is disposed in a plurality of data lines included in a display panel. Each of the data line capacitors has a larger capacitance than a storage capacitor of each pixel. The data line capacitor includes the data line, an insulating layer, a metal, which are stacked. The metal is a cathode or a pixel electrode. The insulating layer of the data line capacitor is a passivation layer, a planarization layer, or a pixel defining layer. The capacitance of the data line capacitor is adjusted by controlling the thickness of the insulating layer or controlling the size of a via hole or a contact hole for controlling the thickness of the insulating layer.

The invention provides a light-emitting device, a manufacturing method thereof, and an electronic apparatus which can improve the emission efficiency of light, obtain uniform brightness within a display surface in high reliability, in particular, and which can suppress lowering of the emission efficiency of light due to various wiring line structures, even though a large screen is performed. In a light-emitting device having a light-emitting element in which a first electrode on a base substrate, a functional layer having a light-emitting layer, and a second electrode are sequentially deposited, the first electrode and the second electrode are reflective, and the second electrode has an opening through which light from the light-emitting layer passes.

A film formation source of a vacuum film formation apparatus for forming thin film on the film formation surface of a substrate comprises: a material accommodating unit containing a film formation material; heating means for heating the film formation material contained within the material accommodating unit; a film formation flow control unit provided at an emission outlet of the material accommodating unit for controlling the direction of the film formation flow. The film formation flow control unit provides a strong directivity to the film formation flow with respect to the moving direction of the film formation surface relative to the film formation source.

A planar light source comprises at least one point light source disposed on a supporting substrate, and a cylindrical lens that covers the light emitting observation side of the point light source, wherein the cylindrical lens has a concave lens function in the direction (y direction) perpendicular to the supporting substrate, and has a convex lens function in at least part of the horizontal direction (x direction).

An organic light emitting display includes a plurality of pixels, at least one of the pixels having: an organic light emitting diode; a driving transistor adapted to supply a driving current to the organic light emitting diode; a first switching transistor adapted to selectively supply a data signal to the driving transistor; a second switching transistor adapted to selectively supply an initialization signal; a third switching transistor adapted to selectively allow the driving transistor to be connected as a diode and to selectively supply the initialization sought; a storage capacitor adapted to store a first voltage corresponding to the initialization signal received from the third switching transistor and then to store a second voltage corresponding to the data signal applied at a gate electrode of the driving transistor; and an interrupter adapted to selectively supply a pixel power to the driving transistor and to selectively allow the driving current to flow into the organic light emitting diode. In this display, the amount of current leaking out through a switching transistor is decreased, and thus a voltage variance applied to a gate electrode of a driving transistor is decreased, thereby enhancing a contrast of an image.

A system and method distributes data and power in a robust manner for a large scale LED display. Master modules of the display are capable of receiving a data stream on any one of four data ports. The master modules extract the data for its module and an associated group of slave modules from a data stream received on one port and send the received data stream to three other master modules via the other three data ports. Unregulated D.C. power is distributed from one or more power hubs to the master modules which in turn distribute regulated D.C. power to their associated slave modules.

A liquid crystal display device includes a panel having pixel electrodes arranged at intersections of a plurality of signal lines via switching elements for transmitting display data and a plurality of scanning lines for transmitting control signals, and a control circuit for controlling the panel. The liquid crystal panel is divided into first pixel regions and second pixel regions adjacent to the first pixel regions. The control circuit carries out impulse driving in which the control signals transmitted to each of the scanning lines are activated two times in one frame period for displaying an image. The control circuit writes the display data in either one of the pixel regions and writes reset data in the other pixel regions when the control signals are activated once of the two times. By writing the reset data in the pixel regions, the display data written in an immediately preceding frame are reset. In consecutive frames, the display data written in the pixel regions are always reset in one frame period. Therefore, blurring in a moving image can be alleviated. Since writing the display data and the reset data is carried out separately in the first pixel regions and in the second pixel regions, flicker is prevented from occurring in a display screen.

A new and unique LED-based floodlight is provided having an LED light module and a control module. In operation, the LED light module responses to one or more control signals from the control module, and provides an LED array of light having a broad beam pattern from side-to-side with a selected lamp color, brightness, or some combination thereof; while the control module responds to one or more user inputs from a user, and provides the one or more control signals for operating the LED array module in order to provide the LED array of light having the broad beam pattern from side-to-side with the selected lamp color, brightness, or some combination thereof. The broad beam pattern of the LED array of light effectively has a lumen output of about 200 lumens that is equivalent to a 35 watt halogen floodlight output of the same angle. The selected lamp color may include white, warm white, nav red, nav blue and a “bug” light, as well as other suitable lamp colors, while the selected brightness may include different dimming levels for setting the overall brightness of the LED-based floodlight.

The present invention provides systems and apparatuses for dynamically controlling the operational modes of a single luminaire or a group of networked luminaires configured to deliver an illumination pattern having a decorative colored glow surrounding a central region of substantially uniform brightness. A control module for the luminaire is configured to drive three dimmable fluorescent ballasts, as well as a LED module. A variety of operational modes including different schemes for color mixing and color cycle control can be selected by a user and implemented by a microcontroller. A group of luminaires is connected in a standard communication protocol-based master-slave configuration, where the slave units respond to commands received from the master unit, and the last slave unit automatically engages terminating and biasing resistors for proper operation of the network.

Display systems are described that include an adaptable parallax barrier that filters light passed by a display panel in a manner that allows for the simultaneous viewing of two-dimensional images, three-dimensional images and multi-view three-dimensional content in different display regions. The display system also includes a backlight panel comprising an array of light sources that may be individually controlled to vary the backlighting luminosity provided to the display panel on a region-by-region basis. Since each of the display regions may be perceived as having a different number of pixels per unit area depending upon the type of content being presented, the backlight array enables the brightness of each region to be controlled such that a viewer perceives roughly uniform brightness across all regions. Alternative regional brightness control schemes are also described.