Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-12-23
1993-12-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
35821319, H01J 4014
Patent
active
052705315
ABSTRACT:
The present invention is directed to a solid state image sensing device which can reduce a consumed amount of an electric power.
During a horizontal blanking period, a vertical scanning pulse of 5 V is supplied to a vertical selection line (2A) from a vertical scanning circuit (3). In synchronism therewith, a voltage (.phi.I) is changed from 5 V to 0 V and a voltage (.phi.VGG) is changed from 0 V to 5 V. Thus, a source switch transistor (6) is turned off and a load transistor (9) is turned on, whereby a source follower circuit formed by a pixel transistor (12) and the load transistor (9) of a unit pixel (1) is set in the operable state to read an electrical signal accumulated in the unit pixel (1). According to the present invention, the load transistor (9) is turned on by the application of the voltage (.phi.VGG) only during the electrical signal read-out period and the dark signal read-out period of the unit pixel within the horizontal blanking period. Since a current is flowed to the pixel transistor (12) by a power supply (7) only during this period, a consumed electric power can be reduced considerably as compared with the prior art.
REFERENCES:
patent: 5023443 (1991-06-01), Komatsu et al.
patent: 5128735 (1992-07-01), Ohmi et al.
Nelms David C.
Shami K.
Sony Corporation
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