Patent ID: 6226384
Filing Date: 2001-05-01
Classification: H04N

Abstract:
A display device for decrypting and displaying encrypted video pixel data to thereby eliminate in-the-clear video signals, comprising:an array of p columns and l rows of pixel cells for displaying the decrypted video pixel data as a frame;a frame memory coupled to the array, the frame memory comprising an array of p columns and l rows of corresponding memory elements, each memory element being associated with a particular pixel cell and storing digital code of the decrypted video pixel data which represents the luminance of the particular pixel cell during a frame period;a register coupled to an input of the frame memory for receiving and storing at least a portion of a frame of the digital code of the encrypted video pixel data in an encrypted order rather than in a column and row sequential order and for providing the video pixel data to the array of memory elements;a write decoder coupled to the frame memory for activating the rows and columns of the memory elements for loading the frame memory with the stored digital code; anda decrypter coupled to the write decoder for supplying the decryption key to the write decoder such that the write decoder activates the rows and columns of the frame memory non-sequentially in accordance with the decryption key, wherein the decryption key ensures that the digital code of the encrypted video data stored in the register for each pixel cell is applied to the correct memory element thus decrypting the video pixel data without providing a frame of decrypted video pixel data before the memory elements are loaded.