Xerox Corporation

Victor M DaCosta

Alan G Lewis

Richard H Bruce

Russel A Martin

Louis D Silverstein

William D Turner

Thomas G Fiske

Malcolm J Thompson

Hugo L Steemers

Duane Siemens

A product such as a display includes a first substrate on which array circuitry and multiplexer circuitry are formed and also includes one or more integrated circuit (IC) structures attached to the first substrate. The array circuitry includes N data lines, each driven by multiplexed signals, where N is greater than 32. The multiplexer circuitry provides the multiplexed signals in response to analog drive signals from P analog input leads and multiplexer control signals from Q control leads, where P is less than N but not less than 32 and where Q is less than N but not less than N/P. Each of R IC structures can includes a single crystal substrate, each with digital-to-analog converting (DAC) circuitry, where R is greater than zero. Each substrate has at least S analog output leads, where S is not less than 32. Together, the R IC structures have T analog output leads, where T is greater than P, and each of the P analog input leads is paired with and connected to one of the T analog output leads. The array circuitry and multiplexer circuitry can include polysilicon thin-film transistors (TFTs) on a glass substrate. The IC structure can be attached to the glass substrate using tape-automated bonding (TAB) or chip-on-glass (COG) techniques. This architecture makes it possible to use commercially available DAC ICs and significantly reduces the number of external chips required to drive the array as the number of pixels in the array increases.

Display with array and multiplexer on substrate and with attached digital-to-analog converter integrated circuit having many outputs

An array of light control units has an area large enough to present images for direct viewing. The array also has light control units sufficiently dense that ordinary acuity artifacts are not noticeable in presented images when the array is directly viewed at usual viewing distances by a human with normal vision. Signal circuitry can provide signals to the light control units. The array can present an image that includes M colors, where M is more than three, even though each light control unit can only cause presentation of one of a segment with one of a set of N colors, where N is less than M. Data defining an input image with M colors are used to obtain data defining an output image that is a version of the input image but includes, for each light control unit, a color data item indicating one of its set of N colors. The signal circuitry provides signals to the light control units so that each light control unit presents a segment with the color indicated by its color data item. As a result, the array presents the output image so that its appearance to a human with normal vision viewing the array at usual viewing distances is substantially identical to the appearance the input image would have if presented.

Universal display that presents all image types with high image fidelity

An array includes redundant integrated scan drivers that can provide signals to each other through scan lines. Each scan driver can be a shift register, each stage of which includes a tri-state inverter to provide its output to one of the scan lines. To transfer signals from one shift register to the other, one shift register provides signals while the outputs of the other shift register are in a floating state. The other shift register receives the signals and can then shift them to its output. The signals can be test signals used to detect defects in the shift registers and in the array. Also, each stage in each shift register is connected to receive signals from the scan line that is driven by the preceding stage. Therefore, if the preceding stage is removed due to a defect, the following stage can receive signals through the scan line from the other shift register and continue to function even though its preceding stage is removed.

Array with redundant integrated self-testing scan drivers

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San Jose, CA, United States of America

Victor M DaCosta