Current drive circuit and display device

Details Current drive circuit and display device Current drive circuit and display device

2011-08-30

2011-08-30

Liang, Regina (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S077000

Reexamination Certificate

active

08009126

ABSTRACT:
In a current drive circuit, variation in output current is reduced. A current adjustment section and a current output section generate a grayscale according to a target grayscale. The current adjustment section generates an intermediate current lint, which is a reference current Iref multiplied by a first coefficient, and the current output section generates an output current Iout, which is the intermediate current Iint multiplied by a second coefficient. The minimum value of the first coefficient is set in advance such that when the first coefficient is at a minimum value the voltage at a node (for the minimum grayscale) is greater than or equal to a predetermined first value which is larger than the operation threshold voltage of PMOS transistors in the current output section.

REFERENCES:
patent: 2005/0174307 (2005-08-01), Nishitoba et al.
patent: 2007/0040773 (2007-02-01), Lee et al.
patent: 2003-288051 (2003-10-01), None

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