Patent ID: 8259095

Claim:
A display, comprising: (a) a display substrate having a display area, and a plurality of chiplets having a substrate independent of the display substrate located over the display substrate in the display area, each chiplet having at least one connection pad, at least one pixel control circuit, and at least one pixel test circuit; (b) a plurality of pixels located in the display area, each pixel including a control electrode, a second electrode, and at least one layer of light-emitting material located between the control electrode and second electrode, wherein the pixel control circuit is connected to the control electrode for driving the control electrode causing the light-emitting material to emit light; (c) a controller connected to one or more chiplets for providing external control signals to the chiplet; and (d) wherein the pixel test circuit includes one or more test light emitters responsive to the external control signals, the test light emitters emitting light independently of the layer of light-emitting material.