Single layer sensor pattern

摘要

A single ITO layer design for a touchscreen panel incorporates a matrix of sensor cells formed from a single ITO layer of capacitive sensor pads, sensor bars, force lines and sense lines. Columns of multiplexed force lines are connected to rows of sensor pads to form force trees such that the force line of the end pair of sensor pads has a wide track, with the force lines of each subsequent pair of sensor pads having a reduced track width. Disposed between the columns of force trees, the matrix of sensor cells also includes columns of sensor bars connected to control circuitry via sense lines. The control circuitry applies a signal to the force trees to generate capacitance between rows of sensor pads and adjacent sensor bars. The control circuitry senses changes in the capacitance and resolves the location of a user touch in the matrix of sensor cells.

主权项

1. A capacitive sensing structure, comprising:
a matrix of sensor cells, wherein each sensor cell comprises:
a pair of transmit electrodes separated by a channel, the pair of transmit electrodes including a first transmit electrode and a second transmit electrode,a set of force lines disposed within the channel and connecting the pair of transmit electrodes in parallel with other pairs of transmit electrodes in a row of sensor cells, andone or more sensing electrodes disposed on opposite sides of the sensor cell and adjacent respective ones of the first and second transmit electrodes; wherein respective columns of sensor cells are connected by sets of force lines disposed along the channels of respective sensor cells in the column, each of the sets of force lines terminating at respective pairs of transmit electrodes comprising the sensor cells in the column; and electrical connection of the sensing electrodes disposed in a column of sensor cells; and wherein the transmit electrodes, sensing electrodes and force lines are formed from a single indium tin oxide (ITO) layer.