Dual row control signal circuit for reduced image sensor shading

An imaging sensor comprising:

• an array having a plurality of pixel sensor cells arranged in a plurality of horizontal rows and vertical columns, pixel data being read out on column lines of the array through the action of first and second row control signal circuits;
• the first and second row control signal circuits each comprising a row select circuit, a row driver circuit and a column bias circuit;
• the first row control signal circuit being coupled to the left terminus of each of the row of pixels;
• the second row control signal circuit being coupled to the right terminus of each of the row of pixels;
• wherein the employment of the two row control signal circuits reduces a variation of the row select and row driver signals along the rows of pixels which reduces a left to right or horizontal shading of an image captured and read out from the imaging array;
• wherein the row driver circuits are supplied by a variable positive voltage (VH) supply and a variable negative voltage (VN) supply both of which comprise external low drop-out voltage regulating power supplies;
• wherein the output signal of the row driver circuits is the voltage level between a voltage VH and VN which is taken from a drain to a source single row stack of four transistors comprising two N-channel transistors M1 and M2, and two P-channel transistors M3 and M4, at a point between transistors M2 and M3;
• and
• wherein the variable positive voltage (VH) supply is connected to a gate terminal of P-channel transistor M4 and the variable negative voltage (VN) supply is connected to a gate terminal of the N-channel transistor M1 and gate electrodes of transistors M4 and M3 are not connected and gate electrodes of transistors M2 and M1 are not connected.