Patent ID: 7327379

Claim:
A pixel clock and pulse-modulation-signal generating device, comprising: a high-frequency-clock generating unit that generates a high-frequency clock; a modulation-data generating unit configured to receive and use pixel control data that assigns a pixel length and image data to generate phase data that indicates a transition timing of a pixel clock and modulation data that indicates a desired bit pattern that corresponds to the image data; a pixel-clock generating unit configured to receive and use the high-frequency clock, the phase data and a horizontal synchronization signal to generate the pixel clock with the transition timing indicated by the phase data; and a serial-modulation-signal generating unit configured to receive and use the modulation data, the high-frequency clock, and the pixel clock to output a pulse modulation signal in a serial pulse string based on the high-frequency clock, wherein the modulation-data generating unit adds data to or deletes data from the modulation data based on the pixel control data, and data is added to the modulation data at an arbitrary position when a length of a pixel is to be increased.