Systems and methods for adjusting display parameters of an active matrix organic light emitting diode panel

#1. Field of the Invention

#The present invention relates to active matrix organic light emitting diode (AMOLED) panels, and more particularly, to a method of adjusting display parameters for AMOLED panels for improving the yield of manufactured AMOLED displays.

#2. Description of the Prior Art

#FIG. 1 is a functional block diagram of an active matrix organic light emitting diode (AMOLED) display according to the present invention.

#FIGS. 2 and 3 illustrate methods of adjusting the luminance of pixels during a white-point adjustment.

#FIG. 4 is a detailed block diagram of the source driver circuit shown in FIG. 1.

#Systems and methods for adjusting display parameters of an active matrix organic light emitting diode panel will now be described here in greater detail. Some embodiments of the invention, such as the exemplary embodiments described, can potentially ensure that the AMOLED panel is always operated with the best color characteristics, and the optimum display parameters are retained even when the AMOLED display is powered off.

#Referring now to the drawings, FIG. 1 is a functional block diagram of an active matrix organic light emitting diode (AMOLED) display 10 according to the present invention. The AMOLED display 10 contains an AMOLED panel 20 comprising a plurality of pixels 22. As is well known in the art, each pixel 22 contains a plurality of subpixels 22A-22C or 22A-22D, depending on whether the pixel 22 contains three or four subpixels. The AMOLED display 10 also contains a scan/gate driver 30 for activating individual pixels 22 and subpixels 22A-22D for displaying images. A source driver circuit 40 is used to supply color information to the subpixels 22A-22D for controlling the pixels 22 to display the correct colors.

#When an AMOLED panel 20 is manufactured, the color coordinates of the different sample portions of the panel such as subpixels 22A-22D must be measured for correctly calibrating the color characteristics of the AMOLED panel 20. Depending on the exact color coordinates of the subpixels 22A-22D, the luminance of the respective subpixels 22A-22D must be adjusted to achieve an overall white-point for the whole pixel 22. The luminance values are calculated for the subpixels 22A-22D that allow the respective pixel 22 to display a true white color. After the white-point adjustment, the optimum display parameters are stored so that the AMOLED panel 20 is controlled using the optimum display parameters each time the AMOLED panel is used to display images.