US4434441A
Expired / Lapsed
US
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Method for driving a charge injection device
Assignee: Fujitsu Ltd
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Filing: 1981-11-23
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Granted: 1984-02-28
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Expires: 2001-11-23
Abstract
Abstract A charge injection device sensing an optical radiation pattern is driven at an operation sequence where the charge holding mode is inserted between the charge storing/readout mode and the charge injection mode. The charge holding period is effective for picture elements influenced by charges injected into the substrate after the readout operation placed spacially far and timed. The problem of cross-talk at high speed operation is resolved.
Inventors
- 👤 Hiroyuki Ishizaki
- 👤 Yoshiki Tsujino
- 👤 Masaji Dohi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:30
CPC Classifications
H; H10; H10F; H10F39/00; H10F39/10; H10F39/12; H10F39/15; H10F39/154; H04; H04N; H04N25/00; H04N25/70; H04N25/76
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
A method for driving a charge injection device having picture elements, each consisting of a storing electrode and a detecting electrode, arranged in the form of a matrix on a semiconductor substrate, the storing electrodes of the picture elements being connected in common for each column or row and the detecting electrodes being connected in common for each row or column, said charge injection device having a basic operation sequence essentially containing each operation of charge storing, readout and injection, said method comprising the steps of sequentially applying the basic operation sequence for each picture element which is considered as the readout unit with a constant time delay; and inserting the specified charge holding period between the readout period and the injection period.
Claim 2
Independent Claim
123 words
A method for driving a charge injection device having picture elements, each consisting of a storing electrode and a detecting electrode, arranged in the form of a matrix on a semiconductor substrate, the storing electrodes of the picture elements being connected in common for each column or row and the detecting electrodes being connected in common for each row or column, said charge injection device having a basic operation sequence essentially containing each operation of charge storing, readout and injection, said method comprising the steps of sequentially applying the basic operation sequence for each picture element which is considered as the readout unit with a constant time delay; and inserting the specified charge holding period between the readout period and the injection period.
Claim 3
Dependent Claim
37 words
A method for driving a charge injection device as claimed in claim 1, wherein said charge holding period is longer than the period required for completing readout operation of at least one adjacent readout unit picture element.
Claim 4
Dependent Claim
29 words
A method for driving a charge injection device as claimed in claim 1, wherein said charge holding period is provided at a potential well just under said storing electrode.
Claim 5
Dependent Claim
37 words
A method for driving a charge injection device as claimed in claim 1, wherein the picture element group which is the unit of the readout operation includes picture elements connected in common in a row or column.
Claim 6
Dependent Claim
93 words
A method for driving a charge injection device as claimed in claim 4, further comprising the steps of providing a column bus connecting the storing electrodes of each column in common, a row bus connecting the detecting electrodes of each row in common, connecting charge sensitive amplifiers corresponding to said row bus, sequentially applying voltage waveforms consisting of the storing mode, readout mode, charge holding mode and charge injection mode repeatedly to said column bus, and reading out the signal charges in the unit of the column direction picture element array in parallel.
Claim 7
Dependent Claim
63 words
A method for driving a charge injection device as claimed in claim 5, further comprising the step of periodically changing the operation voltage applied to said detecting electrodes through said row bus to high and low levels to cause the potential well just under the pertinent electrode to disappear prior to the start of the charge injection mode for each said column bus.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |