Patent ID: 6556191
Filing Date: 2003-04-29
Classification: G09G

Abstract:
An image display apparatus for displaying an image on a dot-matrix type image display unit on the basis of an input image signal of an arbitrary standard, said apparatus comprising:input dot clock reproducing means for reproducing an input dot clock on the basis of an input horizontal synchronizing signal of the input image signal; A/D converting means for converting the input image signal into a digital signal in response to the reproduced input dot clock; image display means drive circuit for converting the digital signal into a display signal which is suitable for display by the image display unit and generating a drive timing signal for the display; a number of horizontal valid pixels detecting circuit for detecting the number of horizontal valid pixels of the display signal on the basis of the display signal and the drive timing signal; and an input dot clock control circuit for controlling a frequency of the input dot clock so that the number of horizontal valid pixels is equal to a desired value.