Browse Prior Art Database

Display Device

IP.com Disclosure Number: IPCOM000097009D
Original Publication Date: 1962-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Thomas, FJ: AUTHOR

Abstract

In this display device, two polarizers 4 and 6 are oriented to ordinarily inhibit the passage of light from source 2 to screen 7. A group of photoelastic sonic delay lines 8, each having an input transducer 10 and an energy absorber 12, are adjacently located between the polarizers. Lines 8 rotate the polarization of the light impinging upon them in the areas of mechanical disturbance.

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Display Device

In this display device, two polarizers 4 and 6 are oriented to ordinarily inhibit the passage of light from source 2 to screen 7. A group of photoelastic sonic delay lines 8, each having an input transducer 10 and an energy absorber 12, are adjacently located between the polarizers. Lines 8 rotate the polarization of the light impinging upon them in the areas of mechanical disturbance.

Each line of the video signal from signal generator 1, which simulates television receiver circuits, is sequentially applied to the corresponding delay lines 8 through AND's 14. Each AND is conditioned by an output of ring timer 16. This is reset by the vertical sync signal and shifted by the horizontal sync signal.

The video signal causes mechanical disturbance to be propagated along the delay lines. These disturbances rotate the polarization of the applied light to generate a display on the screen. The horizontal sync signal is also delayed. It is used to strobe the light source 2 as each line of video reaches the correct position along its corresponding line 8.

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