Abstract: A method for the correction of average brightness or brightness uniformity variations in electroluminescent (EL) displays comprising: a) providing an EL display having one or more light-emitting elements responsive to a multi-valued input signal for causing the light-emitting elements to emit light at a plurality of brightness levels; b) measuring the brightness of each light-emitting element at two or more, but fewer than all possible, different input signal values; c) employing the measured brightness values to estimate a maximum input signal value at which the light-emitting element will not emit more than a predefined minimum brightness and the rate at which the brightness of the light-emitting element increases above the predefined minimum brightness in response to increases in the value of the input signal; and d) using the estimated maximum input signal value at which the light-emitting element will not emit light more than the predefined minimum brightness and the rate at which the brightness of the l

Abstract: An intelligent power management system is particularly applicable to accessory devices that can be coupled to a basic device to provide the basic device with an enhanced feature. The accessory device includes a control processor and a power supply unit, wherein the power supply unit supplies electrical energy to the control processor in response to a control signal received from the basic device. The power supply unit includes a power management circuit that maintains the electrical energy supplied to the control processor during fluctuations of the control signal.

Abstract: A method for the correction of average brightness or brightness uniformity variations in OLED displays comprising: a) providing an OLED display having one or more light-emitting elements responsive to a multi-valued input signal for causing the light-emitting elements to emit light at a plurality of brightness levels; b) measuring the brightness of each light-emitting element at two or more, but fewer than all possible, different input signal values; c) employing the measured brightness values to estimate a maximum input signal value at which the light-emitting element will not emit more than a predefined minimum brightness and the rate at which the brightness of the light-emitting element increases above the predefined minimum brightness in response to increases in the value of the input signal; and d) using the estimated maximum input signal value at which the light-emitting element will not emit light more than the predefined minimum brightness and the rate at which the brightness of the light-emitting ele

Abstract: A detection system for the detection of brightness and uniformity variations in an OLED display, comprising: a two-dimensional OLED display having a pre-defined group of light-emitting elements distributed across the display; a two-dimensional imager; optical elements arranged so that the imager is exposed to all of the light-emitting elements in the predefined group of light-emitting elements of the OLED display simultaneously and at a magnification such that each light-sensitive sensor element records the light output from no more than one light-emitting element; and a controller to control the OLED display and cause each of the light-emitting elements of the predefined group of light-emitting elements to illuminate and the imager to acquire images of the illuminated light-emitting elements in the OLED display. The invention is further directed towards a method for the measurement of brightness and uniformity variations in light-emitting elements of an OLED display.

Abstract: A method for manufacturing and grading OLED devices is described, comprising the steps of: a) manufacturing OLED devices having a plurality of pixels; b) measuring pixel brightness and uniformity variation of each of the OLED devices prior to burning-in the OLED devices; c) correcting the pixel brightness and uniformity variation of each of the OLED devices prior to burning-in the OLED devices; d) grading each of the corrected OLED devices prior to burning-in the OLED devices; e) burning-in OLED devices graded as acceptable prior to burning-in the OLED devices; f) measuring burned-in pixel brightness and uniformity variation of each of the burned-in OLED devices; g) re-correcting the pixel brightness and uniformity variation of each of the burned-in OLED devices; and h) grading each of the re-corrected, burned-in OLED devices.

Abstract: A method for the correction of brightness and uniformity variations in OLED displays, comprising: a) providing an OLED display having a plurality of light-emitting elements with a common power signal and local control signals; b) providing a digital input signal for displaying information on each light-emitting element, the signal having a first bit depth; c) transforming the digital input signal into a transformed digital signal having a second bit depth greater than the first bit depth; and d) correcting the transformed signal for one or more light-emitting elements of the display by applying a local correction factor to produce a corrected digital signal.

Abstract: The present invention relates to a ring seal for between a floating roof and a side wall in a liquid and vapor storage tank. The ring seal includes a number of overlapping shoe plates hung from the floating roof by pantagraph hanger assemblies. The pantagraph hanger assemblies urge the shoe plates against the side wall and a gap seal prevents tank vapor loss along a lap joint between adjoining shoe plates.

Abstract: A cable supporting structure includes a longitudinally extending channel-shaped support structure having a pair of spaced side walls with free end portions turned inwardly to form opposed longitudinally extending flanges. A locking strap has opposite end portions and an intermediate portion therebetween. A support member is positioned within the support structure to extend between the side walls with opposite ends thereof respectively supported by the flanges. The support member includes a pair of slots for receiving the locking strap to cause the intermediate portion to extend around a central body portion of the support member in overlapping relation therewith. The support member includes resiliently deflectable extensions at the ends thereof for producing frictional contact between the support member and the side walls tending to resist movement of the support member within the support structure.