Input/output pixel circuit and array of such circuits

Details Input/output pixel circuit and array of such circuits Input/output pixel circuit and array of such circuits

1990-12-13

1993-04-20

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340707, G09G 300

Patent

active

052046613

ABSTRACT:
A light sensing and display driving apparatus is operable independent of polling cycle providing a more accurate sensing of the patterns of illumination incident on an array of such apparatus, with a minimum of required interconnections per pixel. Each address line may simultaneously initialize one row of apparatus while enabling the subsequent row of apparatus. The apparatus is also compatible with elements capable of providing gain in the sensing mode, given that the photosensitive element is separate from the path across which voltage or current is measured. The display driving portion is compatible with standard active-matrix LCDs. The apparatus allows a minimum physical isolation between the sensing and display portions while maintaining sufficient electrical isolation to prevent the deleterious effects resulting from application of a display driving potential to sensing circuitry, and allows employing a timing scheme for both sensing and display driving within a short time period. The apparatus may be fabricated of amorphous silicon. The apparatus includes, inter alia, a conductive element interconnecting input and output terminals, a multiple-state sensing device whose state changes in response to the incidence of electromagnetic or ionizing radiation thereupon, apparatus connected to the conductive element and to the sensing device for modifying the conductance of the conductive element as a function of the state of the sensing device, and a display driving element connected also to the input and output terminals. A filter may be interposed between a light source and the circuit or the array of circuits to provide color or similar source differentiation.

REFERENCES:
patent: 4345248 (1982-08-01), Togashi et al.
patent: 4395736 (1983-07-01), Fraleux
patent: 4614966 (1986-09-01), Yunoki et al.
patent: 4655552 (1987-04-01), Togashi et al.
patent: 4698686 (1987-10-01), Endo et al.
patent: 4876585 (1989-10-01), Ozawa
Matsumura et al., Amorphous-Silicon Image Sensor IC, IEEE Electron Device Letters, vol. EDL-1, No. 9, Sep., 1980 pp. 182-184.
Manufacturing Hurdles Challenge Large-LCD Developers, IEEE Spectrum, Sep. 1989, pp. 36-40.

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