In order to meet the big screen display's requirements on touchpad and overcome the disadvantages of interactive touchpad on property and cost

a new type of touchpad technology was invented which was an application of optical system imaging principle as well as optical sensing device of PSD. The infrared spotlight source of contact point of touch pen and touch board imaging on the optical sensor through simple optical system consisted of optical lens and the location of the touch point will be determined by data processing such as coordinates correction. The low cost

easy integration

high sensitivity

high speed of data processing and simple system structure of the new touchpad can be applied to the big size and proportion of the touchpad.