Abstract: In a rear projection microdisplay TV with dynamic iris control, sensed average picture level (APL) or other sensed brightness level is used to dynamically establish microdisplay driver offsets including white balance.

Abstract: A method for storing status information prior to shutdown of a video monitor due to a failure. An indication of an operational parameter is obtained. Based on the indication, it is determined if the failure occurs warranting shutdown. If the failure occurs, status information is stored in a non-volatile memory for later retrieval during repair. A shutdown sequence is generated to disable the video monitor.

Abstract: The present invention discloses a method and apparatus for generating a synchronizing signal during a frequency switch-over of an input signal from a first frequency to a second frequency in a video monitor system. The method comprises the steps of: (1) detecting the frequency switch-over; (2) maintaining the synchronizing signal at the first frequency; (3) generating the synchronizing signal at a third frequency; (4) determining if the second frequency is valid; and (5) if the second frequency is valid, generating the synchronizing signal at the second frequency.

Abstract: The present invention discloses a method and apparatus for providing error detection capability for initialization data stored in a non-volatile memory used in a video monitor. The method comprises the steps of: (1) storing N test values in N distinct locations in the non-volatile memory; (2) reading the N stored test values from the non-volatile memory, each test value being read for K times; (3) selecting N read test values representative of the N stored test values; (4) comparing the N read test values with N corresponding check values; and (5) if the N read test values are equal to the N corresponding check values, reading the initialization data from the non-volatile memory.