Brillian Corporation

Three-five Systems, Inc.

Russell J Flack

John Karl Waterman

Matthias Pfeiffer

Terence R Klein

Jerome A Frazee

Joseph T Smith

Terrence R Klein

Anna Prakash

Andreas Grubert

Terry Klein

A liquid crystal display (LCD) system, comprising a matrix of pixels, analyzes a video data stream for grayscale level jumps from extreme black to moderate gray levels. Transitions in grayscale levels are restricted between adjacent pixels so as to reduce image degradation due to fringe field effects. A memory, such as a plurality of shift registers, may be used to store grayscale levels of adjacent pixels which are compared and if a ratio between these grayscale levels exceeds a desire value then at least one of the grayscale levels is modified.

Image quality improvement for liquid crystal displays

A liquid crystal display (LCD) system, comprising a matrix of pixels, analyzes a video data stream for grayscale level jumps from extreme black to moderate gray levels. Transitions in grayscale levels are restricted between adjacent pixels so as to reduce image degradation due to fringe field effects. A memory, such as a shift register, may be used to store and then grayscale levels to be written to adjacent pixels are compared and if a difference between these grayscale levels exceed a certain value then at least one of the grayscale levels is modified.

An LCD pixel device is provided of the type deployed in a matrix of pixels selectively energized by a plurality of row lines and plurality of column lines and wherein a video voltage is stored on at least one pixel capacitor and coupled to an image-generating device. First and second source regions are formed near the surface of a semiconductor substrate. A drain region is likewise formed in the substrate between the first and second source regions forming the channels of first and second field-effect-transistors. An insulating layer is formed on the substrate, and first and second gate electrodes are provided in the insulating layer between the first source region and the drain region and the second source region and the drain region respectively. First and second mirrors are provided on the surface of the insulating layer. Conductive interconnects formed in the insulating layer provide electrical coupling between the first and second transistors, the first and second capacitors, and the first and second mirrors, respectively.

Pixel circuit with shared active regions

An LCD micro display for generating an image of a video signal includes a matrix of pixels arranged in a plurality of rows and a plurality of columns, which are selectively energized to create the image. The rows are connected to a row select circuit for energizing each of the rows in accordance with a first predetermined sequence. The columns are coupled to a column select circuit coupling the video signal to each of the columns in accordance with the second predetermined sequence. The column select circuit includes a plurality of video switches, each of which include a high speed current mirror level shifter for shifting the control signal from a first potential to a second higher potential. A transmission gate couples the video signal to one of the columns upon receipt of the higher potential control signal.

High contrast LCD microdisplay

A matrix of liquid crystal pixels ( ) is provided. A digital-to-analog converter (DAC) ( ) is coupled to the matrix and produces an output voltage that can be applied to one or more pixels in the matrix. The DAC ( ) receives a multi-bit digital input and generates its output voltage to correspond to the digital input. The conversion function of the DAC is adapted to have a higher resolution within a voltage range in which most grayshade changes of the LCD occur.

System and method for providing voltages for a liquid crystal display

Image quality improvement for liquid crystal display

The present invention includes methods and apparatus for driving a cholesteric display system using a dynamic drive scheme. The dynamic drive scheme is used to drive the electrodes of the cholesteric display in order to provide desired pixel states. Pixel states are controlled by the voltage applied across the pixel. The present invention uses pulse width modulation (PWM) during the dynamic drive scheme in order to control the voltage applied across the pixels. PWM modulation may be used during any phase (e.g., preparation phase, selection phase, evolution phase, and/or final phase) of the dynamic drive waveform depending on the needs of the cholesteric display system.

Growing community of inventors

Scottsdale, AZ, United States of America

Russell J Flack