Provided is a light emitting diode (LED) manufactured by using a wafer bonding method and a method of manufacturing a LED by using a wafer bonding method. The wafer bonding method may include interposing a stress relaxation layer (33) formed of a metal between a semiconductor layer (20) and a bonding substrate (31). When the stress relaxation layer is used, stress between the bonding substrate and a growth substrate may be offset due to the flexibility of metal, and accordingly, bending or warpage of the bonding substrate may be reduced or prevented.

Light-emitting device and method of manufacturing the same

A coordinated wireless lighting system and an associated wireless lighting module. The wireless lighting system having a first wireless lighting module including a battery, a first light emitting diode, a wireless transceiver, a processor, and a housing. The wireless lighting system also having a second wireless lighting module separate from the first wireless lighting module. The second wireless lighting module includes a second light emitting diode, a sensor configured to detect a predetermined condition, a processor device in communication with the sensor and configured to generate an input signal in response to detection of the predetermined condition; and a transmitter configured to transmit the input signal to the first wireless lighting module. The processor device of the second wireless lighting module is configured to cause a change in illumination of the second light emitting diode of the second wireless lighting module in response to the detection of the predetermined condition. The wireless transceiver of the first wireless lighting module is configured to receive the input signal. The processor of the first wireless lighting module is configured to control illumination of the first light emitting diode of the first wireless lighting module based on the input signal received from the second wireless lighting module.

Wireless lighting devices and applications

An organic light emitting display capable of displaying an image with uniform luminance regardless of deterioration of an organic light emitting diode and threshold voltage and/or mobility of a drive transistor is disclosed. The organic light emitting display senses deterioration of the organic light emitting diode and threshold voltage and/or mobility of a drive transistor and modifies the data supplied to the pixel according to the sensed parameters.

Organic light emitting display and driving method thereof

An organic light emitting diode (OLED) display includes an array of OLEDs, each OLED having two terminals; a voltage sensing circuit for each OLED including a transistor in each circuit connected to one of the terminals of a corresponding OLED for sensing the voltage across the OLED to produce feedback signals representing the voltage across the OLEDs; and a controller responsive to the feedback signals for calculating a correction signal for each OLED and applying the correction signal to data used to drive each OLED to compensate for the changes in the output of each OLED.

OLED display with aging compensation

Modular lighting systems

A method of optimizing lifetime of an OLED display element and an OLED display element with optimized lifetime for possible use in a tiled display, while maintaining light output are described. It compensates an OLED operating parameter such as supply voltage and/or on-time of the operating current based on at least one environmental factor which affects aging and on at least one operating factor which is indicative of aging, e.g. by determining the brightness of an OLED display element. To optimize the light output, pre-charge of the aged OLED display elements can be optimized. The knowledge of the working temperature of OLED tiles may be used to regulate the cooling and thus the working temperature, thus improving the lifetime of the display. Furthermore the intensity and contrast of the display illumination may be set within predefined limits to reduce the aging.

Method and system for measuring and controlling an OLED display element for improved lifetime and light output

The present invention relates to a configurable emissive display tile, e.g. an organic light-emitting diode (OLED) display tile and associated methods for use in a tiled large-screen display application. The OLED tile assembly of the present invention is capable of operating either as an autonomous display or, alternatively, may operate within a set of OLED display tiles forming a larger tiled display. An embodiment of an OLED tile assembly (100) according to an embodiment of the present invention is shown in Fig. 1C, including a power supply (158), a cooling system with cooling fans (160) and cooling blocks (146) and a control system, comprising a control board (154) with processor, an OLED board (142) and a substrate (140). It furthermore includes a digital video interface and an automatic addressing system The present invention further includes a method of initial assembly, automatic configuration, and calibration of the tiled OLED display and a method of replacing, adding, or removing one or more OLED tile assemblies in a larger tiled display.

Configurable tiled emissive display

Method for displaying images on a large-screen organic light-emitting diode display, characterized in that use is made of an organic light-emitting diode (OLED) display (100) comprising an array of OLED display tiles (140) that are each formed of an array of smaller OLED display modules (130), each OLED display module (130) comprising a number of OLED pixels, wherein each OLED display module (130) includes an intelligent OLED module processing system (210), whereby, in order to display the images, data concerning the image to be displayed, provided by a general processing unit, in other words a system controller, are transmitted to tile processing systems (220) and from each tile processing system (220) towards the respective modules (130), characterized in that the OLEDs are driven by means of current sources, and in that in each OLED module processing system (210) the voltage across the current source (430) of the worst OLED (420) is compared to a pre-stored minimum threshold voltage value, and if said voltage is lower than the threshold voltage value, an adjustment of the power supply voltage is carried out.

Method for displaying images on a large-screen organic light-emitting diode display, and display used therefore

The present invention relates to a method of controlling a modular, tiled, large-screen emissive display application, e.g. an OLED display application. The method of controlling e.g. includes a first control level (214) for controlling the emissive devices, a second control level (212) for controlling the emissive display modules and a third control level for controlling the emissive display tiles (210). The number of control levels can be larger or it can be restricted to two levels. The method of controlling according to the present invention allows for similar control and calibration algorithms to be run at all levels, and allows for distributed processing in order to reduce bandwidth requirements and processing complexity. Furthermore, the control method of the present invention includes a method of operating and a method of monitoring a modular, tiled, large-screen emissive display.

Control system for a tiled large-screen emissive display

The present invention provides arrangements for electroluminescent displays 10 comprising a packaged semiconductor light emitting element 12 that has a light emitting display side 16 A heat sink 22 is disposed in the region of a rear side of the light-emitting element 12 opposite to the display side Electrical connections 28 from the light emitting element 12 pass through said heat sink 22 Drive circuitry 30 for the light emitting element 12 is connected thereto by the electrical connections 28 and spaced apart from the heat sink 22 in such a manner that at least one cooling channel 34 is defined between the heat sink 22 and the drive circuitry 30 for the passage in use of a cooling fluid

Robbie Thielemans

Papers

Method and system for measuring and controlling an OLED display element for improved lifetime and light output

Configurable tiled emissive display

Method for displaying images on a large-screen organic light-emitting diode display, and display used therefore

Control system for a tiled large-screen emissive display

Light emission display arrangements