Patent US6204610B1 successfully refreshed from Google Patents.
US6204610B1
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Electroluminescence display device
Assignee: Sanyo Electric Co Ltd
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Filing: 2000-03-17
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Granted: 2001-03-20
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Expires: 2020-03-17
Abstract
Abstract A drive circuit is provided in an active type electroluminescence (EL) display device including a plurality of EL elements ( 20 ). Each EL element is composed of a plurality of anodes ( 201 ) separately formed corresponding to each pixel, a cathode ( 202 ) commonly formed for the plurality of anodes, and an emissive layer ( 45 ) interposed between the anodes and the cathode. The EL elements are driven by TFTs 24 connected between the plurality of anodes provided for each pixel and a power source voltage (Vdd). The drive circuit comprises a current detector circuit ( 2 ) for detecting the current flowing from the cathode and for generating an output voltage corresponding to the detected current, a voltage inverting amplifier circuit ( 3 ) for inverting and amplifying the output voltage, and a current amplifier circuit ( 4 ) for performing current amplification of the output from the voltage inverting amplifier circuit. The drive circuit operates to increase or decrease the power source voltage (Vdd) in accordance with the current flowing from the cathode. With this arrangement, images having optimal contrast according to the number of light-emitting pixels can be displayed while power consumption is reduced.
Inventors
- 👤 Naoaki Komiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:35
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/30; G09G3/32; G09G3/3208; G09G3/3225; G09G3/3233; H; H05; H05B; H05B33/00; G09G2300/00; G09G2300/08; G09G2300/0809; G09G2300/0842; G09G2310/00; G09G2310/04; G09G2320/00; G09G2320/02; G09G2320/029; G09G2320/04; G09G2320/043; G09G2320/06; G09G2320/066; G09G2330/00; G09G2330/02; G09G2330/021; G09G2330/028
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
An electroluminescence display device having a plurality of pixels, wherein: each pixel comprises an electroluminescence element including at least an emissive layer between an anode separately provided for each pixel and a cathode commonly provided for the plurality of pixels, and at least a switch element for controlling a current supply from a power source commonly provided for the plurality of pixels to the anodes of said electroluminescence elements; and a current flowing from said common cathode provided for the plurality of pixels is detected, and emissive luminance of said electroluminescence elements is controlled according to the detected current.
Claim 2
Dependent Claim
99 words
An electroluminescence display device having a plurality of pixels, wherein: each pixel comprises an electroluminescence element including at least an emissive layer between an anode separately provided for each pixel and a cathode commonly provided for the plurality of pixels, and at least a switch element for controlling a current supply from a power source commonly provided for the plurality of pixels to the anodes of said electroluminescence elements; and a current flowing from said common cathode provided for the plurality of pixels is detected, and emissive luminance of said electroluminescence elements is controlled according to the detected current.
Claim 3
Dependent Claim
45 words
The device defined in claim 1 , further comprising: a current detector circuit for detecting current flowing from said common cathode provided for the plurality of pixels; and a control circuit for controlling the emissive luminance of said electroluminescence elements according to the detected current.
Claim 4
Dependent Claim
34 words
The device defined in claim 2 , wherein said control circuit lowers the voltage of said power source when said detected current increases, and increases said power source voltage when said detected current decreases.
Claim 5
Dependent Claim
60 words
The device defined in claim 2 , wherein said current detector circuit generates a voltage corresponding to said detected current; and said control circuit includes: a voltage inverting amplifier circuit for inverting and amplifying a voltage output from said current detector circuit; and a current amplifier circuit for performing current amplification of an output from said voltage inverting amplifier circuit.
Claim 6
Dependent Claim
113 words
A drive circuit for an electroluminescence display device, each of a plurality of pixels in said device having an electroluminescence element including at least an emissive layer between an anode separately provided for each pixel and a cathode commonly provided for the plurality of pixels, and at least a switch element for controlling a current supply from a power source commonly provided for the plurality of pixels to the anodes of said electroluminescence elements, said drive circuit comprising: a current detector circuit for detecting current flowing from said common cathode provided for the plurality of pixels; and a control circuit for controlling emissive luminance of said electroluminescence elements according to said detected current.
Claim 7
Dependent Claim
113 words
A drive circuit for an electroluminescence display device, each of a plurality of pixels in said device having an electroluminescence element including at least an emissive layer between an anode separately provided for each pixel and a cathode commonly provided for the plurality of pixels, and at least a switch element for controlling a current supply from a power source commonly provided for the plurality of pixels to the anodes of said electroluminescence elements, said drive circuit comprising: a current detector circuit for detecting current flowing from said common cathode provided for the plurality of pixels; and a control circuit for controlling emissive luminance of said electroluminescence elements according to said detected current.
Claim 8
Dependent Claim
35 words
The drive circuit defined in claim 5 , wherein said control circuit lowers the voltage of said power source when said detected current increases, and increases said power source voltage when said detected current decreases.
Claim 9
Dependent Claim
61 words
The drive circuit defined in claim 5 , wherein said current detector circuit generates a voltage corresponding to said detected current; and said control circuit includes: a voltage inverting amplifier circuit for inverting and amplifying a voltage output from said current detector circuit; and a current amplifier circuit for performing current amplification of an output from said voltage inverting amplifier circuit.
Claim 10
Independent Claim
106 words
A method for driving an electroluminescence display device having a plurality of pixels, each pixel having an electroluminescence element including at least an emissive layer between an anode separately provided for each pixel and a cathode commonly provided for the plurality of pixels, and at least a switch element for controlling a current supply from a power source commonly provided for the plurality of pixels to the anodes of said electroluminescence elements, said driving method comprising the steps of: detecting a current flowing from said common cathode provided for the plurality of pixels, and controlling emissive luminance of said electroluminescence elements according to said detected current.
Claim 11
Independent Claim
106 words
A method for driving an electroluminescence display device having a plurality of pixels, each pixel having an electroluminescence element including at least an emissive layer between an anode separately provided for each pixel and a cathode commonly provided for the plurality of pixels, and at least a switch element for controlling a current supply from a power source commonly provided for the plurality of pixels to the anodes of said electroluminescence elements, said driving method comprising the steps of: detecting a current flowing from said common cathode provided for the plurality of pixels, and controlling emissive luminance of said electroluminescence elements according to said detected current.
Claim 12
Dependent Claim
36 words
The driving method defined in claim 8 , further comprising the steps of: lowering the voltage of said power source when said detected current increases; and increasing said power source voltage when said detected current decreases.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-03-19 | 2004-09-18 | 2005-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-03-19 | 2008-09-18 | 2009-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-03-19 | 2012-09-18 | 2013-03-20 | $7700.00 | Window Closed / Lapsed |