Martin J. Edwards

P‐198L: Late‐News Poster: Integrated Ambient Light Sensor in LTPS AMLCDs

Sensing ambient light in mobile applications allows reduced power consumption through backlight control. Integration of light sensors reduces module complexity and location of the sensors close to the pixel array simplifies integration in products. We describe an integrated ambient light sensor consisting of lateral pin diodes and digital read out circuit.

A highly integrated AMLCD with low‐voltage operation

A highly integrated low-temperature polysilicon AMLCD has been designed that operates from a 3-V power supply and has a low-voltage digital interface. This has been achieved by reducing the threshold voltage of the TFTs and integrating digital column drive circuits and charge-pump circuits onto the display substrate. In standby mode, the display is capable of retaining an image without the need for external signals through the integration of dynamic-memory circuits within the pixels of the display.

P-195L: Late-News Poster: A High Resolution LTPS AMLCD with Integrated 8-bit DAC

A 222 dpi LTPS AMLCD with integrated 8-bit DACs for reduced system cost is described. The architecture is based on a 2-stage resistor-capacitor DAC with a 2-way interleaved architecture that is well suited to high-resolution LTPS displays. We have confirmed images with high uniformity on a 1.8 inch QVGA display.

33.5L: Late News Paper: Dynamic Self-Refreshing Memory-in-Pixel Circuit for Low Power Standby Mode in Mobile LTPS TFT-LCD

A compact low power dynamic memory-in-pixel circuit has been integrated into a 1.9″ QCIF+ LTPS mobile AMLCD. The power consumed by the active matrix array and the row and column drive circuits can be reduced to a value of just ∼100μW. This low power consumption is possible because the refresh circuit is integrated within the pixel, which reduces the power to charge the columns and common electrode during each refresh cycle.