TAOS has announced the TCS3x71 and TCS3x72 digital color RGB sensors with an infrared blocking filter and a proximity sensor. The sensors provide color measurement and, when coupled with an IR LED, proximity detection within a wide range of lighting conditions and through a variety of attenuating materials. The IR blocking filter is integrated on-chip and localized only to the color sensor photodiodes. High-accuracy color sensing requires eliminating errors caused by the IR spectral component in light sources. The IR blocking filter minimizes these effects, eliminates requirements for external IR filtering, and enables the devices to perform ambient light sensing. Ambient light sensing instruments are used in display-based devices to enable automatic backlight brightness control based on lighting conditions. The sensors have applications in portable medical diagnostic systems.