# US 4,399,456 A · Three-dimensional television picture display system and picture pick-up device and picture display device suitable therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,399,456 A - Document ID: US4399456A - Status: Granted - Kind: A - Application number: 06/304,540 - Filed: 1981-09-23 - Granted: 1983-08-16 - Earliest claimed: 1980-10-14 - Assignees: U.S. Philips Corporation - Inventors: Peter C. Zalm - Web page: https://patentgrep.com/patent/US4399456A ## CPC - H04N 13/239: using two two-dimensional [2D] image sensors having a relative position equal to or related to the interocular distance (H04N13/243 takes precedence) - H04N 13/161: Encoding, multiplexing or demultiplexing different image signal components (for multi-view video sequence encoding H04N19/597) - H04N 13/167: Synchronising or controlling image signals - H04N 13/189: Recording image signals; Reproducing recorded image signals - H04N 13/194: Transmission of image signals - H04N 13/296: Synchronisation thereof; Control thereof - H04N 13/305: using lenticular lenses, e.g. arrangements of cylindrical lenses - H04N 13/324: Colour aspects - H04N 13/337: using polarisation multiplexing - H04N 13/341: using temporal multiplexing - H04N 13/363: using image projection screens (volumetric display H04N13/388) - H04N 13/398: Synchronisation thereof; Control thereof - H04N 2013/0081: {Depth or disparity estimation from stereoscopic image signals} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A three-dimensional television picture display system in which information intended for the right and left eye, respectively, of an observer is generated on a display screen (11, 20) in respective first and second images (V1, V2) which are shifted into the direction of line scan. In order to prevent eye strain due to conflicting depth information and any resultant headache, irritation and discomfort, the periodic line blanking of the second image (V2) intended for the left eye is shifted into the direction of line scan at picture generation on the display screen (11, 20) relative to the periodic line blanking of the first image (V1) intended for the right eye. The three-dimensionally shifted line blanking can be realized either electronically (6, 7; 22) or by providing on either side of the display screen (20) of the picture display device (19) strips (HB1, HB2) which transmit/do not transmit information. ## Claims ### Claim 1 A three-dimensional television picture display system comprising a picture pick-up device and a picture display device having a picture display screen and scanning means for performing, in scanning periods and with blanking periods, a periodic scanning operation of the screen at line and field frequency for generating on the screen a picture corresponding to the original scene recorded with the pick-up device, information which is intended for the right and for the left-eye, respectively, of an observer being present in this picture in first and second images, respectively, the images being shifted in the direction of line scan, which, for an entire, image information-separated observation with two eyes, results in a three-dimensional picture, characterized in that said system further comprises means for shifting the periodic line blanking of the second image relative to the periodic line blanking of the first image in the direction of line scan. ### Claim 2 (depends on 1) A system as claimed in claim 1, wherein said picture pick-up device comprises a first and a second television camera which, on recording, represent the right and left eye, respectively, and a signal generator for producing line and field synchronizing and blanking signals, characterized in that said shifting means is incorporated in the picture pick-up device, and said shifting means comprises a first and a second line blanking circuit, each having a control input for receiving a line blanking signal and a signal input for connection to an output of the first and the second television camera, respectively, said camera outputs carrying signals representing the scene, a line blanking signal output of said signal generator being connected to the control input of the first line blanking circuit and, via a delay device, to the control input of the second line blanking circuit, the outputs of the said first and second line blanking circuits are connected to respective inputs of a change-over device, a control input thereof being connected to a field change-over output of the signal generator, and an output of said change-over device being coupled to an output terminal of the picture pick-up device. ### Claim 3 (depends on 1) A system as claimed in claim 1, wherein the picture pick-up device comprises a first and a second television camera which, on recording, represent the right and left eye, respectively, and a signal generator for producing line and field synchronizing and blanking signals, characterized in that outputs of the first and the second television camera carrying signals representing the scene are connected to inputs of a first change-over device which has a control input which is connected to an output of the generator for carrying a field-change-over signal, an output of said first change-over device being coupled to a signal input of a line blanking circuit which has a signal output for connection to an input of the picture display device, and a control signal input for receiving a line blanking signal, this control input being connected to an output of a second change-over device which has a first and a second signal input which are connected directly and via a delay device, respectively, to an output of the signal generator for carrying a line blanking signal, said second change-over device having a control input which is connected to an output of the signal generator for carrying a field change-over signal. ### Claim 4 (depends on 1) A system as claimed in claim 1, characterized in that said shifting means is incorporated in said picture display device, said shifting means comprising vertical strips being removably provided transversely of the direction of line scan on opposite sides of the display screen of the picture display device, the strips present on the display screen at the beginning and at the end of the line scan, respectively, not transmitting the information locally generated in the second and first image, respectively, intended for the left and right eye, respectively, of the observer. ### Claim 5 (depends on 4) A picture display device as claimed in claim 4, characterized in that the said vertical strips are movable in horizontal direction at the edge of the display screen. ### Claim 6 (depends on 4, 5) A picture display device as claimed in claim 4 or 5, characterized in that a removable neutral-density filter is provided on the display screen between said vertical strips. ### Claim 7 (depends on 4) A system as claimed in claim 4, characterized in that the picture display device is a projection picture display device wherein said vertical strips are removably provided on the remotely located display screen thereof.