Cirrus Logic Inc.

Modugu V Reddy

Dayakar C Reddy

Sriram Ramamurthy

Krishnan C Dharmarajan

An image displayed on a digital display such as a flat panel display is rotated while the same image is displayed on a cathode ray tube display in unrotated form. When image rotation is selected, the read address sequence into a frame buffer may be reversed and the bit read sequence may be reversed. Thus a frame of panel pixel data stored within the frame buffer of an external video memory may be scanned onto a flat panel to display a rotated image.

Image rotation for video displays

A display system in a computer or multimedia system maintains a predetermined image quality. The display system includes an intelligent display driver controller (IDDC), a serial PROM, display screen, and sensors. The IDDC controls display of input image data on the display screen based on a control set. The serial PROM stores a plurality of such control sets, each of which has a predetermined effect on the image quality. The sensor measures a parameter, a change in which may degrade the image quality on the display screen. In response to such a change, the IDDC retrieves a new control set from the serial PROM, and controls display of input image data based on the new control set retrieved. As a result, the IDDC maintains the predetermined image quality on the display system independent of change in the measured parameter.

Method and apparatus for automatically maintaining a predetermined image

A digital system provides command data to a display system during the display time period such that minimal image degradation occurs. The digital system includes a CPU coupled to a graphics controller coupled to a display system via a cable. The display system includes an intelligent display driver controller (IDDC), driver circuits, display screen, and possibly sensors. The IDDC operates on image data and instructs the driver circuits to display an image on the display screen. Operating condition changes measured by transducers may result in a degradation in image quality unless a response is made. The digital system may automatically respond to operating condition changes to maintain a predetermined image quality level. Alternatively a user's request may change the image quality. In either case the CPU is interrupted and it provides one or more control sets of command data interspersed within the image data transparently to the graphics controller. The IDDC receives one or more control sets from the graphics controller and may store a control set to adjust the control over the driver circuits thereby preserving the image quality. Changes to hardware and software are minimized to reduce the costs of adding these improvements.

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San Jose, CA, United States of America

Modugu V Reddy