Abstract: A projection-type video display device which is easily radio-connected to a portable terminal and can freely switchably display video images sent from a plurality of portable terminals is provided. The projection-type video display device is directly connected to a portable terminal (2) by a radio transmission scheme without a relay station. The projection-type video display device (1) has a proximity communication unit (10) which transmits/receives device information of the projection-type display device (1) to/from the portable terminal, and the portable terminal (2) is put over or touched on the proximity communication unit (10) to transmit/receive the device information. The projection-type video display device has a radio signal input unit 20 which selects a desired portable terminal from the plurality of portable terminals and connects the selected portable terminal.

Abstract: A phase shifter is provided to adjust the phase of the pixel clock generated by a PLL to the data of the digital image signal regenerated by a digital interface receiver circuit. The pixel clock which is output from the phase shifter is used as a pixel clock in a digital interface transmitter circuit.