Thomas A. Knotts

XGA resolution full-video microdisplay using light-emitting polymers on a silicon active matrix circuit

Capable self-emissive polymers are being developed for use as emitting materials for a variety of display applications. This paper describes the use of standard CMOS integrated circuit silicon wafer technology along with a spin-cast polyfluorene-base polymer emissive layer, to demonstrate an XGA resolution, full video microdisplay. The silicon chip drive circuitry (Analog Pixel-APIX) is described along with results from our efforts to optimize the reflective anode, the semitransparent cathode process, and emissive cell construction. The 1024 X 768 pixel display achieves 200 Cd/m2 brightness at low power (<50 mW) with fast 1 usec response times. In addition, we summarize future directions to achieve color and the need to incorporate a production- worthy seal layer on microdisplays manufactured on silicon wafers.

8-bit/color 1024/spl times/768 microdisplay with analog in-pixel pulse width modulation and retinal averaging offset correction

A liquid-crystal-on-silicon microdisplay based on a 1024/spl times/768 2-D pixel array fabricated in a digital 0.35 /spl mu/m CMOS process displays images with a color depth of 8-bits/color. The pixel pitch is 22 /spl mu/m and the total chip area is 214 mm/sup 2/. Pixel brightness is controlled by modulating the pulse width of the pixel voltage drive signal with an in-pixel analog pulse width modulation (PWM) circuit which utilizes human optic nerve spatio-temporal averaging to eliminate comparator offset. The 16 million transistor chip displays images at a maximum rate of 85 Hz and has a power dissipation of 200 mW from a single 3.3 V supply.