Patent ID: 7646362
Filing Date: 2010-01-12
Classification: G09G

Abstract:
1. A display device, comprising: an active-matrix OLED display panel for receiving image data, the panel having a plurality of pixels, each pixel having an OLED element; means for supplying setting values for contrast and brightness, wherein such setting values are separate from the image data to the OLED display panel; the active-matrix OLED display panel including display setting circuitry including a multiplier and an adder for setting a relationship between image data and current values for current flowing in all OLED elements in response to the supplied contrast and brightness setting values and the supplied image data; estimation circuitry for estimating total panel current flowing in all of the plurality of pixels when carrying out display for the display panel based on the image data; and current control circuitry for controlling actual panel current by correcting the supplied contrast or brightness setting values based on the panel current estimated by the estimation circuitry, so that the actual panel current does not exceed a selected maximum value; and wherein the current control circuitry controls contrast based on the following equation: where C is contrast setting value, B is brightness setting value Lw0 is maximum luminance at initial setting time (C=1, B=0), a is luminance at the time panel current becomes IMax, when displaying a totally white surface, divided by Lwo, Ical is panel current when subjecting original image data values to linear conversion, Imax is maximum current flowing in the panel, Icalx is the Ical value (can be arbitrarily set) for the point at which maximum luminance beams to lower, and k is gamma correction input data divided by luminance.