Patent ID: 7595596
Filing Date: 2009-09-29
Classification: H05B,Y02B

Abstract:
1. A control circuit for an OLED panel, comprising: a plurality of OLEDs respectively located in a corresponding plurality of paths; a current amount determination circuit determining current amounts on said plurality of paths; a voltage supply circuit under control by a control signal, for providing an output voltage to said current amount determination circuit; and a matching feedback adjustment circuit for generating said control signal according to a difference among said current amounts of said plurality of paths, wherein said matching feedback adjustment circuit includes: wherein: (a) said matching feedback adjustment circuit further includes a voltage source between said comparator or said operational amplifier and said minimum signal selector circuit, or (b) said minimum signal selector circuit has an internal voltage difference between its inputs, whereby said voltage source, or said internal voltage difference, or a sum of said voltage source and said internal voltage difference, determines a value such that when said difference among said current amounts of said plurality of paths is larger than said value, said voltage supply circuit increases its output voltage; when said difference among said current amounts of said plurality of paths is smaller than said value, said voltage supply circuit decreases or keeps its output voltage.