Sarnoff Corporation

Intel Corporation

Princeton University

Other

Zilan Shen

Roger Green Stewart

Dennis Lee Matthies

James Harold Atherton

Stephen R Forrest

Paul E Burrows

Heinz Hermann Busta

Bawa Singh

Alfred C Ipri

William Ronald Roach

Dennis John Bechis

Robin Mark Adrian Dawson

Satyam Choudary Cherukuri

Yongchi Tian

Pradyumna Kumar Swain

Michael Gillis Kane

William Chiang

Vipulkumar K Patel

Dennis J Hechis

Jia Ming Chen

Hyoun Park

Keith Graydon

Stephen John Connor

A tiled display device is formed from display tiles having picture element (pixel) positions defined up to the edge of the tiles. Each tile includes a memory which stores display data, and pixel driving circuitry which controls the scanning and illumination of the pixels on the tile. The tiles are formed in two parts, an electronics section and a display section. Each of these parts includes connecting pads which cover several pixel positions. Each connecting pad makes an electrical connection to only one row electrode or column electrode. The connecting pads on the display section are electrically connected and physically joined to corresponding connecting pads on the electronics section to form a complete tile.

Tiled electronic display structure

An organic light emitting device display may include transverse row and column lines. In a passively driven OLED display, a fuse may be positioned between the OLED material and the row electrode. When a short occurs, the single pixel may be separated from the circuit by the fuse, avoiding the possibility that an entire row of pixels may be adversely affected by the short associated with one single pixel along a row.

Fused passive organic light emitting displays

Provided is a solid phase array of electrical sensors, each comprising a channel and electrical leads for attaching to a voltage, current or resistivity meter for measuring the voltage, current or resistivity through the pore, wherein the channels are formed of a single substrate.

Solid phase sensors

A tiled display device is formed from display tiles having picture element (pixel) positions defined up to the edge of the tiles. Each pixel position has an organic light-emitting diode (OLED) active area which occupies approximately 25 percent of the pixel area. Each tile includes a memory which stores display data, and pixel driving circuitry which controls the scanning and illumination of the pixels on the tile. The pixel driving circuitry is located on the back side of the tile and connections to pixel electrodes on the front side of the tile are made by vias which pass through portions of selected ones of the pixel areas which are not occupied by the active pixel material. The tiles are to formed in two parts, an electronics section and a display section. Each of these parts includes connecting pads which cover several pixel positions. Each connecting pad makes an electrical connection to only one row electrode or column electrode. The connecting pads on the display section are electrically connected and physically joined to corresponding connecting pads on the electronics section to form a complete tile. Each tile has a glass substrate on the front of the tile. Black matrix lines are formed on the front of the glass substrate and the tiles are joined by mullions which have the same appearance as the black-matrix lines. Alternatively, the black matrix lines may be formed on the inside surface of an optical integrating plate and the tiles may be affixed to the integrating plate such that the edges of the joined tiles are covered by the black-matrix lines. A cathodoluminescent tile structure is formed from individual tiles that have multiple phosphor areas, a single emissive cathode and horizontal and vertical electrostatic deflecting grids which deflect the electron beam produced by the single cathode onto multiple ones of the phosphor areas.

A display may be formed of a plurality of abutted tiles, each tile contributing a portion of the overall displayed image. Optical elements may be selectively situated between pixels to improve the optical performance of the display. In some embodiments, these optical elements may facilitate the use of relatively thicker cover glasses over the display tiles.

Providing optical elements over emissive displays

An apparatus for measuring the velocity of a droplet of a liquid includes a laser to generating a beam of light and projecting the beam along a first path. A lens is along the first path for forming the beam into the shape of a thin sheet. A beam divider is along the first path for dividing the beam into two separate beams which extend along second and third paths. The second and third paths lie in a common plane. Along the second and third paths is means for projecting a droplet of liquid across the second and third paths so that the droplet passes through both of the divided beams. AT least one photodetector is along the second and third paths to receive the divided beams and provide an electrical signal corresponding to the beams. A beam divider which can be used to divide the beam into two beams includes a body of an optically transparent material having at least two flat front surfaces which are at an angle with respect to each other to form a V having a sharp corner, and at least two flat back surfaces each of which is spaced from and parallel to a separate front surface.

Apparatus for measurement of particle or droplet velocity

A display device having features which enhance the contrast of displayed images includes a pixel structure that defines an active pixel area and an inactive pixel area. The display device may be an emissive device such as an OLED or electroluminescent device, a transmissive device such as a liquid crystal light-valve device or a reflective device, such as a Bistable, Reflective Cholesteric (BRC) liquid crystal device. The ratio of the active pixel area to the total pixel area is less than 50 percent. The display device includes a transparent cover plate having a black matrix formed on the viewer side of the cover plate. The display device may be a tiled display in which case the black matrix is formed on an integrator plate to which the individual tiles are bound to form the complete display device. For reflective or emissive display materials, the display device includes an electronics section including a circuit board which provides driving signals for the pixels of the display device. The electronics section is bound to the display section by an adhesive. To provide a light-absorptive background for the active pixel elements, the circuit board or the adhesive are colored black. The individual pixel elements of the display device include four sub-pixel components separated by portions of the inactive pixel area, which four sub-pixel components together define the active area of the pixel. A lens system is provided on the viewer surface of the display to concentrate light emitted by the active area of the pixel elements into a smaller area, thus decreasing the aperture of the display. Areas between the lenses on the viewer surface of the display are coated with a black material to form a black matrix. A black material is selectively deposited on the front cover plate before applying the metal row electrodes to prevent the row electrodes from providing a reflective surface to the viewer.

Contrast enhancement for an electronic display device by using a black matrix and lens array on outer surface of display

A method and associated system that compensates for long-term variations in the light-emitting efficiency of individual organic light emitting diodes (OLEDs) in an OLED display device, calculates and predicts the decay in light output efficiency of each pixel based on the accumulated drive current applied to the pixel and derives a correction coefficient that is applied to the next drive current for each pixel. In one exemplary embodiment of the invention, the calculation is based the accumulated current that has been passed through the device. In another exemplary embodiment, the calculation is based on a difference in voltage across the pixel at two instants. The compensation system is best used after the display device has been calibrated to provide uniform light output. The present invention further provides a method for calibrating a display device comprising an array of individually adjustable discrete light emitting devices (pixels) using a camera having an array of radiation sensors or a single photodetector. According to this method, the camera captures respective images of substantially equal-sized first sub-areas and adjusts the driving current for each of said pixels within said first sub-areas to achieve a desired light output. Next, the camera captures images of a plurality of second sub-areas, each of the second sub-areas including multiple ones of the first sub-areas second-level sub-areas are adjusted such that each of the first-level sub areas provide substantially equal light output. In an alternative embodiment, each of the first level sub-areas overlaps and, after adjusting a first sub-area to a desired brightness level, the invention adjusts the pixels in each overlapping sub-area to have the same brightness as the overlapping pixels.

Method and apparatus for calibrating display devices and automatically compensating for loss in their efficiency over time

A plurality of sealing methods may be used either alone or in combination with each other to seal an electronic display structure. The display module includes a first substrate having a plurality of column electrodes. Each of a plurality of portions of a display material are coupled to one of the plurality of column electrodes and to one of a plurality of row electrodes. A pixel seal may be formed over the display material to encapsulate the display material. An area seal may be formed upon the first substrate to encapsulates the row electrodes, the column electrodes, and the portions of display material. A bead seal may be formed around the perimeter of the first substrate to couple it to a second substrate while sealing the internal display material. An edge seal may be formed by a banded structure spanning from the first substrate to the second substrate and extending around the perimeter of the substrates.

Sealing of large area display structures

A row-select circuit for an organic light emitting diode display propagates a gating pulse through a shift register. This gating pulse is synchronized with a system clock signal and is used to selectively apply a plurality of broadcast control signals to a selected row of pixels on the display. The line scanning circuitry is controlled to clear and autozero the pixels in the display either one line at a time or the entire image frame at a time. According to another aspect of the invention, the clearing of a row of pixels in the display is performed over several line intervals before the row is autozeroed and loaded with new values. According to yet another aspect of the invention, the broadcast control signals may be adapted to achieve the best performance for each display device.

Line scanning circuit for a dual-mode display

A circuit design technique polysilicon thin-film transistor (TFT) circuitry produces circuits that are relatively less sensitive to threshold variations among the TFT's than circuits designed using conventional techniques. The circuit is designed such that thin-film transistors that are sensitive to threshold variations are made larger than other thin-film transistors in the circuitry to minimize threshold variations among similar transistors implemented in the circuit. In one embodiment, a pixel structure for an active matrix display device implemented in polysilicon includes two transistors, a select transistor and a drive transistor. The drive transistor in the pixel structure is a thin film metal oxide silicon (MOS) transistor that includes a gate to source capacitance sufficient to hold an electrical potential which keeps the transistor in a conducting state for an image field interval. One embodiment of the pixel structure includes only the select transistor and the drive transistor. The pixel storage capacitance is entirely realized by the gate to source capacitance of the drive transistor. Another embodiment of the pixel structure includes a capacitor which is much smaller than the capacitor of a conventional active matrix pixel structure. This capacitor holds the pixel in a non-illuminated state when the drive transistor is turned off. This pixel structure may be used with any display technology that uses an active matrix and stores image data on a capacitance in the pixel, including without limitation, organic light emitting diodes, electroluminescent devices, and inorganic light emitting diodes.

Thin-film transistor circuitry with reduced sensitivity to variance in transistor threshold voltage

A display as for images and/or information comprises a plurality of light-emitting fibers disposed in side-by-side arrangement to define a viewing surface. Each light-emitting fiber includes a plurality of light-emitting elements disposed along its length, each having two electrodes between which are applied electrical signals to cause the light-emitting element to emit light to display a pixel or sub-pixel of the image and/or information. The light-emitting fiber includes an electrical conductor disposed along its length to serve as a first electrode, a layer of light-emissive material disposed thereon, and a plurality of electrical contacts disposed on the light-emissive material to serve as the second electrodes of the light-emitting elements. Preferably, the conductors, light-emissive layer and plurality of electrical contacts are formed in a continuous process wherein a transparent fiber passes through a plurality of processing chambers for receiving the electrical conductor, the light-emissive layer and the plurality of electrical contacts thereon.

Growing community of inventors

Lawrenceville, NJ, United States of America

Zilan Shen