Patent US4642262A successfully refreshed from Google Patents.
Patent US2682280A successfully refreshed from Google Patents.
Patent US3602642A successfully refreshed from Google Patents.
US3602642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beam current stabilization device for a television picture display device
Assignee: US Philips Corp
•
Filing: 1970-02-26
•
Granted: 1971-08-31
•
Expires: 1990-02-26
Abstract
Abstract A television picture display device including a cathode current stabilization circuit of the picture display tube wherein the difference between the cathode current corresponding to a given reference signal and the cathode current corresponding to a blacker-than-black signal in the video signal to be displayed by the picture display tube is stabilized to obtain a perturbation current compensation.
Inventors
- 👤 Pieter Marinus Van Den Avoort
- 👤 Lieuwe Terpstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:24
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/141; H04N9/00; H04N9/12; H04N9/16; H04N9/22; H04N9/24
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
226 words
A television picture display device including a picture display tube having a cathode and a control electrode between which a beam current stabilization device is connected which beam current stabilization device comprises: a first combination device including a video signal input, a cathode output, an output coupled to said control electrode, a control signal input and a gate input; an operation signal generator providing control signals at both a scanning frequency and at one-half that scanning frequency by way of a divider; a first electronic switch coupled intermediate said cathode and said cathode output and controlled by the scanning frequency control signal applied thereto; an electronic commutator switch having an input and two outputs, the commutator switch input being coupled to one of said two outputs under the control of the one-half scanning frequency control signal applied thereto; means for coupling said cathode to the input of said commutator switch input; a second combination circuit having two inputs connected to the respective outputs of said commutator switch, and an output coupled to said control signal input of said first combination device; and means coupled intermediate a one-half scanning frequency control signal output of said operation signal generator and said gate input of said first combination device for obtaining a periodically occurring reference level and a beam current suppression level in the video signal to be displayed.
Claim 2
Dependent Claim
226 words
A television picture display device including a picture display tube having a cathode and a control electrode between which a beam current stabilization device is connected which beam current stabilization device comprises: a first combination device including a video signal input, a cathode output, an output coupled to said control electrode, a control signal input and a gate input; an operation signal generator providing control signals at both a scanning frequency and at one-half that scanning frequency by way of a divider; a first electronic switch coupled intermediate said cathode and said cathode output and controlled by the scanning frequency control signal applied thereto; an electronic commutator switch having an input and two outputs, the commutator switch input being coupled to one of said two outputs under the control of the one-half scanning frequency control signal applied thereto; means for coupling said cathode to the input of said commutator switch input; a second combination circuit having two inputs connected to the respective outputs of said commutator switch, and an output coupled to said control signal input of said first combination device; and means coupled intermediate a one-half scanning frequency control signal output of said operation signal generator and said gate input of said first combination device for obtaining a periodically occurring reference level and a beam current suppression level in the video signal to be displayed.
Claim 3
Dependent Claim
33 words
A television picture display device as claimed in claim 1, characterized in that a current amplifier circuit is included in said means for coupling said cathode to the input of said commutator switch.
Claim 4
Dependent Claim
32 words
A television picture display device as claimed in claim 2, characterized in that the current amplifier circuit includes a second electronic switch being controlled by a scanning frequency control signal applied thereto.
Claim 5
Dependent Claim
113 words
A television picture display device as claimed in claim 1, wherein the first combination device includes an active element an output electrode of which is connected to the control electrode of the picture display tube, a control electrode of said active element being connected to the video signal input of the first combination device, characterized in that an impedance is incorporated in a supply of a further control electrode which supply conveys at least part of the output current of the active element, a further electronic switch incorporated in the first combination device connected in parallel with at least part of said further impedance, said electronic switch being coupled to said gate input.
Claim 6
Dependent Claim
55 words
A television picture display device as claimed in claim 4, characterized in that the first combination device includes a transistor arranged as an emitter follower the base of which is connected to the output of the second combination device and the emitter of which is connected to a connection of the said further electronic switch.
Claim 7
Dependent Claim
65 words
A television picture display device as claimed in claim 5, characterized in that the first combination device includes a series arrangement of two floating supply sources to the junction of which an input of the first combination device is connected, and wherein said first electronic switch comprises two electronic switches connected to said cathode, and connected in series across the series arranged floating supply sources.
Claim 8
Dependent Claim
47 words
A television picture display device as claimed in claim 6 wherein said means for coupling said cathode to the input of said commutator switch comprises a current amplifier with a supply voltage input which is connected between the ends of the series arrangement of floating supply source.
Claim 9
Dependent Claim
52 words
A television picture display device as claimed in claim 6 wherein the first combination device includes a transistor connected as an emitter follower whose base is connected to the output of the second combination device, characterized in that the emitter is connected to the junction of the two series-arranged floating supply sources.
Claim 10
Dependent Claim
32 words
A television picture display device as claimed in claim 5, characterized in that a capacitor is connected between the base and the collector of the said transistor arranged as an emitter follower.
Claim 11
Dependent Claim
94 words
A television picture display device as claimed in claim 1, characterized in that the second combination device includes a phase inverter stage having two inputs which are each connected to a different output of the commutator switch, and an output connected to the output of the second combination device, a phase inversion of a signal applied to one of the inputs of the phaseinverter stage taking place from this input to the output, the signal being passed on in the same phase from the other input of the phase inverter stage to the output.
Claim 12
Dependent Claim
98 words
A television picture display device as claimed in claim 10, characterized in that the commutator switch includes a circuit having two emitter-coupled transistors to the common emitters of which a current source circuit is connected, the cathode of the picture display tube being connected to an input of said current source circuit, while the collectors of the emitter-coupled transistors are each connected to a different input of the said phase inverter stage and the bases of the emitter-coupled transistors are each connected to a different output of the divider, the latter outputs supplying switching voltages in phase opposition.
Claim 13
Dependent Claim
48 words
A television picture display device as claimed in claim 10, wherein the first combination device includes a series arrangement of two floating supply sources, characterized in that the commutator switch and the phase inverter stage are connected to the ends of the series arrangement of floating supply sources.
Claim 14
Dependent Claim
42 words
A television picture display device as claimed in claim 1, wherein the first combination device includes a series arrangement of two floating supply sources, characterized in that the divider is connected to the ends of the series arrangement of floating supply sources.
Claim 15
Dependent Claim
31 words
A television picture display device as claimed in claim 1, characterized in that the cathode of the picture tube is connected through an inductor to the rest of the circuit arrangement.
Claim 16
Dependent Claim
42 words
A television picture display device as claimed in claim 1, characterized in that the television picture display device includes a delay circuit for delaying the beginning of the control signals relative to the end of one writing period of the time base.
Claim 17
Dependent Claim
52 words
A television picture display device as claimed in claim 15 wherein the operation signal generator provides signals of the line frequency and the divider provides signals of half the line frequency, characterized in that the delay period of the delay circuit is longer than half a microsecond and shorter than one microsecond.
Claim 18
Dependent Claim
54 words
A television picture display device as claimed in claim 1, characterized in that said means coupled intermediate a one-half scanning frequency control signal output of said operation signal generator and said gate input of said first combination device comprises a gating circuit including a field flyback signal input and a line flyback signal input.
Claim 19
Dependent Claim
100 words
A television picture display device as claimed in claim 6, characterized in that the electronic switches connected to the cathode of the picture display tube are formed by a series arrangement of two complimentary transistors whose emitters are connected to the cathode of the picture display tube, the collector of one transistor being connected to one end of one of the floating supply sources and the collector of the other transistor being connected through a resistor to one end of the other floating supply source, while the bases of the complementary transistors are connected to balanced outputs of the divider.
Claim 20
Dependent Claim
30 words
A television picture display device as claimed in claim 18, characterized in that the divider consists of a bistable multivibrator connected in parallel with the series arranged floating supply sources.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |