Patent ID: 9544535
Date: 2017-01-10
CPC Classifications: G09G,H04N

Claim:
1. A transmission method for transmitting 24 bit pixel data of an uncompressed image for one screen in one direction to a receiving apparatus by using a differential signal transmitted via a plurality of transition minimized differential signaling (TMDS) channels, the TMDS channels being operable to transmit data of a fixed number of bits per clock transition of a pixel clock in a valid image period, the valid image period being a period between sequential vertical synchronization signals and not including a horizontal blanking period and a vertical blanking period, the transmission method comprising: receiving, via a display data channel (DDC) line, high resolution image data related information which indicates whether or not the receiving apparatus supports a high resolution image having pixel data of 30 bit, 36 bit or 48 bit, the high resolution image data related information is described in High Definition Multimedia Interface (HDMI) Vender Specific Data Bit (VSDB) of Enhanced Extended Display Identification Data (E-EDID) stored in the receiving apparatus; determining whether or not the receiving apparatus supports a high resolution image based on the high resolution image data related information; and based on the determining, transmitting high resolution image data in one direction to the receiving apparatus by using a differential signal transmitted via the plurality of TMDS channels in the valid image period, raising a frequency of the pixel clock, and inserting a color depth (CD) bit, which is related to a bit number of the high resolution image data, into a general control packet, the general control packet including a general control packet header and general control subpacket including CD values, being transmitted during a data island period of the high resolution image data, in one direction, to the receiving apparatus, in which the CD values of CD wherein during the transmitting step, after raising the frequency of the pixel clock, one pixel data of the high resolution image data of 30 bit is transmitted in 1.25 pixel clock transitions, one pixel data of the high resolution image data of 36 bit is transmitted in 1.5 pixel clock transitions, or one pixel data of the high resolution image data of 48 bit is transmitted in two pixel clock transitions, in which the high resolution image data is encrypted in accordance with High-Bandwidth Digital Content Protection (HDCP).