US5581159A
Expired / Lapsed
US
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Back-to-back diode current regulator for field emission display
Assignee: Micron Technology Inc
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Filing: 1995-11-07
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Granted: 1996-12-03
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Expires: 2015-11-07
Abstract
Abstract A circuit for regulating the pixel current in a field emission display so as to enhance pixel-to-pixel uniformity of pixel current. The pixel current flows through a pair of diodes connected back-to-back. A transistor circuit controls the voltage across the back-to-back diode pair, so that the voltage/current transfer characteristic of the diode pair determines the pixel current.
Inventors
- 👤 John K. Lee
- 👤 Eugene H. Cloud
- 👤 David A. Cathey, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:00
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/006; G09G3/20; G09G3/22; H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/125; H01J31/127; G09G2300/00; G09G2300/08; G09G2300/0809; G09G2310/00; G09G2310/02; G09G2310/0243; G09G2310/0248; G09G3/2007; G09G3/2011; G09G3/2014; H01J2201/00; H01J2201/30; H01J2201/319; Y; Y10; Y10S; Y10S315/00; Y10S315/07
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
167 words
A field emission display having improved brightness uniformity, comprising: a plurality of emitter groups, each emitter group including a number of emitter tips; an electrical power source; a back-to-back diode pair having two diodes connected back-to-back between first and second terminals, the diode pair having a voltage-current transfer characteristic, the first terminal of the diode pair being connected to the electrical power source, and the second terminal of the diode pair being connected to the emitter tips so that substantially all electrical current flow from the emitter tips flows through the diode pair to the power source; and an amplifier circuit having an input connected to receive a luminance signal and having an output connected to the diode pair, wherein the amplifier produces across the diode pair a voltage proportional to the luminance signal; whereby the current flow between the power source and the emitter tips is a function of the luminance signal, said function being determined by the voltage-current transfer characteristic of the back-to-back diode pair.
Claim 2
Dependent Claim
167 words
A field emission display having improved brightness uniformity, comprising: a plurality of emitter groups, each emitter group including a number of emitter tips; an electrical power source; a back-to-back diode pair having two diodes connected back-to-back between first and second terminals, the diode pair having a voltage-current transfer characteristic, the first terminal of the diode pair being connected to the electrical power source, and the second terminal of the diode pair being connected to the emitter tips so that substantially all electrical current flow from the emitter tips flows through the diode pair to the power source; and an amplifier circuit having an input connected to receive a luminance signal and having an output connected to the diode pair, wherein the amplifier produces across the diode pair a voltage proportional to the luminance signal; whereby the current flow between the power source and the emitter tips is a function of the luminance signal, said function being determined by the voltage-current transfer characteristic of the back-to-back diode pair.
Claim 3
Dependent Claim
93 words
A display according to claim 1, wherein the amplifier circuit of each emitter group comprises a unity-gain voltage amplifier having an output, an uninverted input, and an inverted input, the amplifier output being connected to the first terminal of the diode pair, the uninverted input being connected to the second terminal of the diode pair, and the inverted input being connected to receive the luminance signal; and the electrical power source connected to the first terminal of the diode pair of each emitter group is the amplifier output connected to said first terminal.
Claim 4
Dependent Claim
69 words
A display according to claim 1, wherein the amplifier circuit of each emitter group comprises a field-effect transistor having a source terminal connected to the second terminal of the diode pair, a drain terminal connected to the emitter tips, and a gate terminal; and the luminance signal of each emitter group is a voltage connected between the gate of the transistor and the first terminal of the diode pair.
Claim 5
Dependent Claim
46 words
A display according to claim 3, wherein the power source connected to the first terminal of the diode pair of each emitter group is a reference voltage source; and the luminance signal of each emitter group is a voltage connected to the gate of the transistor.
Claim 6
Dependent Claim
27 words
A display according to claim 4, wherein the reference voltage source of each emitter group provides a fixed voltage to the first terminal of the diode pair.
Claim 7
Dependent Claim
94 words
A display according to claim 4, wherein the reference voltage source of each emitter group provides to the first terminal of the diode pair a voltage whose value is selectable between a first reference voltage and a second reference voltage, wherein the first reference voltage biases the transistor of the emitter group so that the transistor does not conduct current between the emitter tips and the reference voltage source, and wherein the second reference voltage biases the transistor of the emitter group so that the transistor conducts current in proportion to the luminance signal.
Claim 8
Dependent Claim
109 words
A display according to claim 3, wherein, within each emitter group, a reference voltage source is connected to the gate of the transistor; and the power source connected to the first terminal of the diode pair includes a circuit for outputting to said first terminal a voltage proportional to the luminance signal inverted; whereby the power source and the reference voltage source function cooperate so as to apply the luminance signal between the gate of the transistor and the first terminal of the diode pair, whereby the power source functions as a pan of the amplifier which produces across the diode pair a voltage proportional to the luminance signal.
Claim 9
Dependent Claim
25 words
A display according to claim 7, wherein the reference voltage source of each emitter group provides a fixed voltage to the gate of the transistor.
Claim 10
Dependent Claim
91 words
A display according to claim 7, wherein the reference voltage source of each emitter group provides to the gate of the transistor a voltage whose value is selectable between a first reference voltage and a second reference voltage, wherein the first reference voltage biases the transistor of the emitter group so that the transistor does not conduct current between the emitter tips and the diode pair, and wherein the second reference voltage biases the transistor of the emitter group so that the transistor conducts current in proportion to the luminance signal.
Claim 11
Dependent Claim
98 words
A field emission display having improved brightness uniformity, comprising: a plurality of emitter groups, each emitter group including a number of emitter tips; a reference voltage source; a transistor having a source terminal, a drain terminal connected to the emitter tips, and a gate terminal connected to receive a luminance voltage signal; and a back-to-back diode pair having two diodes connected back-to-back between first and second terminals, the first terminal of the diode pair being connected to the source terminal of the transistor, and the second terminal of the diode pair being connected to the reference voltage source.
Claim 12
Dependent Claim
98 words
A field emission display having improved brightness uniformity, comprising: a plurality of emitter groups, each emitter group including a number of emitter tips; a reference voltage source; a transistor having a source terminal, a drain terminal connected to the emitter tips, and a gate terminal connected to receive a luminance voltage signal; and a back-to-back diode pair having two diodes connected back-to-back between first and second terminals, the first terminal of the diode pair being connected to the source terminal of the transistor, and the second terminal of the diode pair being connected to the reference voltage source.
Claim 13
Dependent Claim
27 words
A display according to claim 10, wherein the reference voltage source of each emitter group provides a fixed voltage to the second terminal of the diode pair.
Claim 14
Dependent Claim
94 words
A display according to claim 10, wherein the reference voltage source of each emitter group provides to the second terminal of the diode pair a voltage whose value is selectable between a first reference voltage and a second reference voltage, wherein the first reference voltage biases the transistor of the emitter group so that the transistor does not conduct current between the emitter tips and the reference voltage source, and wherein the second reference voltage biases the transistor of the emitter group so that the transistor conducts current in proportion to the luminance signal.
Claim 15
Dependent Claim
99 words
A field emission display having improved brightness uniformity, comprising: a plurality of emitter groups, each emitter group including a number of emitter tips; a reference voltage source; a transistor having a source terminal, a drain terminal connected to the emitter tips, and a gate terminal connected to the reference voltage source; and a back-to-back diode pair having two diodes connected back-to-back between first and second terminals, the first terminal of the diode pair being connected to the source terminal of the transistor, and the second terminal of the diode pair being connected to received an inverted luminance voltage signal.
Claim 16
Dependent Claim
99 words
A field emission display having improved brightness uniformity, comprising: a plurality of emitter groups, each emitter group including a number of emitter tips; a reference voltage source; a transistor having a source terminal, a drain terminal connected to the emitter tips, and a gate terminal connected to the reference voltage source; and a back-to-back diode pair having two diodes connected back-to-back between first and second terminals, the first terminal of the diode pair being connected to the source terminal of the transistor, and the second terminal of the diode pair being connected to received an inverted luminance voltage signal.
Claim 17
Dependent Claim
27 words
A display according to claim 13, wherein the reference voltage source of each emitter group provides a fixed voltage to the second terminal of the diode pair.
Claim 18
Dependent Claim
94 words
A display according to claim 13, wherein the reference voltage source of each emitter group provides to the second terminal of the diode pair a voltage whose value is selectable between a first reference voltage and a second reference voltage, wherein the first reference voltage biases the transistor of the emitter group so that the transistor does not conduct current between the emitter tips and the reference voltage source, and wherein the second reference voltage biases the transistor of the emitter group so that the transistor conducts current in proportion to the luminance signal.
References Cited (Backward Citations)
US4658378A
Cited
US4560419A
Cited
US4679170A
Cited
US4908539A
Cited
US4940916A
Cited
US4940916B1
Cited
US5157309A
Cited
US5103144A
Cited
US5162704A
Cited
US5210472A
Cited
US5357172A
Cited
US5283500A
Cited
US5387844A
Cited
US5410218A
Cited
US5396150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-03 | 2000-06-03 | 2000-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-03 | 2004-06-03 | 2004-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-03 | 2008-06-03 | 2008-12-03 | $7700.00 | Window Closed / Lapsed |