in december 1999, ibm japan and olympus optical demonstrated the pc eye-trek, a wearable pc that comprises the ibm-developed small pc unit and a monocular, eyewear display developed by olympus (in replacement of ibm's monochrome eyewear display). olympus's eyewear display used a free-shaped prism and a high-performance optical filter to allow it to be lightweight and an optical see-through. it featured a 0.47-inch reflective-field sequential lcd display with 800×600 full-color resolution supplied by colorado micro display and gave the impression of looking at a 10-inch screen from a distance of 20 inches. by using reflective-type lcd, the power consumption was kept to a minimal 1.6 watts. independently. olympus showed a prototype finger-set input device. in a demonstration, the index finger movement was assigned as slow cursor movement, an index and middle finger together were assigned as quick cursor movement. when a finger bends quickly, the movement is interpreted as a "click". combined with the pc eye-trek, a user can select an icon by just moving and tapping a finger in the air. in 2000, ibm launched the "park bench" tv commercial, which featured its vision for voice-activated wearable pcs.