Patent ID: 6738048
Filing Date: 2004-05-18
Classification: G06F

Abstract:
A touch screen controller for controlling a touch screen and for detecting a screen touch of the touch screen, the touch screen controller comprising:a comparator having a first input and a second input, wherein the comparator is configured to produce an output that is a function of a comparison of the first input and the second input; a digital multiplexer electrically connected to the comparator, wherein the digital multiplexer is configured to receive the output of the comparator and output a first digital signal representative of the output, wherein the first digital signal is indicative of whether the screen touch is occurring, wherein the first digital signal is a LOW digital signal when the screen touch is not occurring, and wherein the first digital signal is a HIGH digital signal when the screen touch is occurring; an analog-to-digital portion for converting a voltage produced by the touch screen into a second digital signal, wherein the second digital signal is indicative of an x,y position of the screen touch; a control logic component electrically connected to the digital multiplexer, wherein the control logic component is configured to receive the first digital signal of the digital multiplexer and the second digital signal of the analog-to-digital portion; and a plurality of pins electrically connected to the control logic component, wherein one of the plurality of pins comprises a data output pin, wherein the data output pin is configured to output both the first digital signal and the second digital signal received from the control logic component, wherein the first digital signal is output as the HIGH digital signal to indicate that the screen touch is occurring before the second digital signal is output.