PWM signal generation circuit and display driver

Details PWM signal generation circuit and display driver PWM signal generation circuit and display driver

2004-12-06

2008-12-02

Mengistu, Amare (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Intensity or color driving control

C345S097000

Reexamination Certificate

active

07460138

ABSTRACT:
A first grayscale clock pulse generation circuit compares a value stored in each timing register with a first count value and outputs a first grayscale pulse to a selector, a calculation circuit calculates the first count value and outputs a second count value, a second grayscale clock pulse generation circuit compares a value stored in each timing register with the second count value and outputs a second grayscale pulse to the selector, a grayscale counter updates a grayscale count value based on the first or second grayscale clock pulse selectively output from the selector in units of one horizontal scan period, and a grayscale coincidence detection circuit changes a voltage level of a PWM signal when the relationship between grayscale data input to the grayscale coincidence detection circuit and the grayscale count value satisfies a predetermined relationship.

REFERENCES:
patent: 4775891 (1988-10-01), Aoki et al.
patent: 5583530 (1996-12-01), Mano et al.
patent: 6377234 (2002-04-01), Nogawa
patent: 6597371 (2003-07-01), Mandl
patent: 2002/0012008 (2002-01-01), Takagi
patent: 2003/0090499 (2003-05-01), Kobayashi
patent: 2005/0134614 (2005-06-01), Tomohara
patent: 2003-150121 (2003-05-01), None

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