Patent ID: 7274346

Claim:
A detection system for the detection of brightness and uniformity variations in a pre-defined group of light-emitting elements in an OLED display, comprising: a) a two-dimensional OLED display having a pre-defined group of light-emitting elements distributed across the display comprising up to N W light-emitting elements in a first dimension and up to N H light-emitting element in a second dimension orthogonal to the first dimension, each light-emitting element having a light-emitting element width and a separation width from an adjacent light-emitting element in the pre-defined group in the first dimension and a light-emitting element height and a separation height from an adjacent light-emitting element in the pre-defined group in the second dimension, wherein the light emitting elements and separations in the first dimension have a characteristic element width P W and separation width S W , P W and S W being the element width and separation width from an adjacent element in the pre-defined group in the first dimension that provides the largest ratio, and the light emitting elements and separations in the second dimension have a characteristic element height P H and separation height S H , P H and S H being the element height and separation height from an adjacent element in the pre-defined group in the second dimension that provides the largest ratio; b) a two-dimensional imager with a plurality of light-sensitive sensor elements sensitive to the light emitted by the light-emitting elements, wherein the number of light-sensitive sensor elements in a first dimension of the imager is greater than 2(N W −1)[(P W +S W )/MIN(P W ,S W )], and the number of light sensitive sensor elements in a second dimension orthogonal to the first dimension of the imager is greater than 2(N H −1)[(P H +S H )/MIN(P H ,S H )]; c) optical elements arranged so that the imager is exposed to all of the light-emitting elements in the predefined group of light-emitting elements of the OLED display simultaneously and at a magnification such that each light-sensitive sensor element records the light output from no more than one light-emitting element; and d) a controller to control the OLED display and cause each of the light-emitting elements of the predefined group of light-emitting elements to illuminate and the imager to acquire images of the illuminated light-emitting elements in the OLED display.