Texas Instruments Corporation

Donald B Doherty

Robert J Gove

Gregory James Hewlett

Stephen Wesley Marshall

Daniel Jay Morgan

Vishal Markandey

Gregory Scott Pettitt

Paul M Urbanus

Richard C Meyer

Scott D Heimbuch

Jeffrey Brian Sampsell

Mark L Burton

Carl W Davis

Joseph G Egan

William J Sexton

John R Reder

Keiichiroh Abe

Sohichiroh Kamei

Henry C Chu

James D Huffman

Venkat V Easwar

Rajeev Ramanath

Rodney Dean Miller

Alan Scott Hearn

Larry D Dickinson

Gary L Sextro

Stephen G Kalthoff

Roman J Pacheco

Roger P Perry

Jefferey B Sampsell

An apparatus for, and method of, increasing compensation sequence storage density in a projection visual display system and a projection visual display system incorporating the apparatus or the method. In one embodiment, the apparatus includes: (1) a memory containing a first compensation sequence portion that is common to a plurality of effective transmission factors and a plurality of second compensation sequence portions that are unique to a corresponding plurality of effective transmission factors and (2) a compensation sequence generator coupled to the memory and configured to construct a compensation sequence for use in the projection visual display system using the first compensation sequence portion and one of the plurality of second compensation sequence portions selected as a function of a particular effective transmission factor.

Apparatus and method for increasing compensation sequence storage density in a projection visual display system

An image compression and decompression method compresses data based upon the data states, and decompresses the compressed data based upon the codes generated during the compression.

Circuit and method for adaptive, lossless compression of successive digital data

A display systemincludes a light sourceand a color wheel. An optical sectionis arranged to receive light from the light sourceand to direct the light toward a color wheel. A digital micromirror deviceis arranged to receive the light from the color wheeland to direct image data toward a display. The image data includes an array of pixels arranged in rows and columns. The array of pixels is arranged as curved color bands during a first time period and rectangular color bands during a second time period. The second time period being concurrent with but of a shorter duration than the first time period.

Constant-weight bit-slice PWM method and system for scrolling color display systems

A method for increasing intensity resolution (bit-depth) using LED illumination. A preferred embodiment comprises determining a display time for a bit to be displayed on a display system, with the display time being based upon a weighting of the bit. If the display time is less than a minimum display time of the display system, then a light modulator and light source modulation are to be used to display the bit. If the display time is equal to or greater than the minimum display time, then a light modulator is to be used to display the bit. The use of a light source that can switch at a faster rate than the light modulator can change states and/or a light source that can produce light at multiple intensities can permit the display of less light and thereby increase the bit-depth of the display system.

Increased intensity resolution for pulse-width modulation-based displays with light emitting diode illumination

A spatial light modulator clocking method, called fast-clear, which employs embedded clear hardware in the SLM to enable the fast-clear bit to generate least-significant short-bit periods and without any bit ordering restrictions. In this method, fast data clearsare inserted between block data loadswithin a frame refresh period. This method virtually eliminates the artifacts associated with the earlier reset-release timing method without the bit-ordering restriction of the jog-clear method.

Control timing for spatial light modulator

An improved color processing method for use in imaging systems transforms the input color image components into an output set of color image components, at least one of which is transformed using a non-linear transformation function.

Sequential color reproduction method

A display system includes a light sourceand a spatial light modulatorlocated to receive light from the light source. The spatial light modulator (e.g., a DMD) includes a number of independently controllable elements that are activated for a period of time to display light of a desired brightness. A light sensoris located to determine a characteristic of light from the light source. A control circuitis coupled to the spatial light modulatorand controls the period of time that the independently controllable elements are activated. This period of time is based at least in part by an input received from the light sensor

Display system timing control method

Display system with clock dropping

Methods and apparatus for use with a discrete bit display system such as a DLP&#xae; display system for increasing brightness by using secondary light bits (such as spoke bits that are otherwise wasted). The light available from the secondary bits is distributed over the entire input/output dynamic range by determining the maximum possible output and then defining the dynamic output range from zero to that maximum range in response to the full range of the input signals.

Discrete light color processor

A display system includes a light sourceand a spatial light modulatorlocated to receive light from the light source. The spatial light modulator (e.g., a DMD) includes a number of independently controllable elements that are activated for a period of time to display light of a desired brightness. A light sensoris located to determine a characteristic of light from the light sourceA control circuitis coupled to the spatial light modulatorand controls the period of time that the independently controllable elements are activated. This period of time is based at least in part by an input received from the light sensor

A system and method for addressing and synchronizing a spatial light modulator (SLM) device and a scrolling color recovery (SCR) illumination system. This method applies all the colors to a single SLM simultaneously and recaptures light rejected by the color filters. The recaptured light is reapplied to the color filters and, if passed by the color filter, directed to the SLM The SCR concept requires multiple colors to be imaged on to an SLM array simultaneously. As the color bands scroll across the SLM, the data applied to elements of the SLM changes to remain appropriate for the color being received by that element. The data a lied to the SLM elements ma be loaded into the SLM by reset group with each reset group load delayed by a skew time relative to the previous group.

Pulse width modulation sequence generation

A system and method for addressing and synchronizing a spatial light modulator (SLM) device and a scrolling color recovery (SCR) illumination system. This method applies all the colors to a single SLM simultaneously and recaptures light rejected by the color filters. The recaptured light is reapplied to the color filters and, if passed by the color filter, directed to the SLM. The SCR concept requires multiple colors to be imaged on to an SLM array simultaneously. As the color bands scroll across the SLM, the data applied to elements of the SLM changes to remain appropriate for the color being received by that element. The data applied to the SLM elements may be loaded into the SLM by reset ground with each reset group load delayed by a skew time relative to the previous group.

An electronic method for addressing and synchronizing a spatial light modulator (SLM) device when used with color scrolling recovery (SCR) illumination. This method applies all the colors to a single SLM simultaneously and recaptures secondary light, redirecting it along the primary color paths to significantly improve the brightness in single-chip display applications. The SCR concept requires multiple colors to be imaged on to an SLM array simultaneously. This requires that the SLM be divided into reset groups so that separate groups of pixels can project bits from the different colors at the same time. As these color bandsscroll across the array, the various reset groups tracks these regions and change content to match. The method requires that the device be divided and controlled at an independent reset group level, with each group being delayed by a group_skew timefrom the previous group. This method assures that all colors are exactly on the SLM at the same time, so that the color mix is the same at all times to assure good color intensities. Finally, the light during the transition time between colors bands, called spokes, is added together as white light that further increases the brightness of the system.

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Richardson, TX, United States of America

Donald B Doherty