US6473065B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of improving display uniformity of organic light emitting displays by calibrating individual pixel
Assignee: Canon Inc
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Filing: 1999-11-14
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Granted: 2002-10-29
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Expires: 2019-11-14
Abstract
Abstract Methods of improving the display uniformity of an OLED are disclosed. In order to improve the display uniformity of an OLED, the display characteristics of all organic-light-emitting-elements are measured, and calibration parameters for each organic-light-emitting-element are obtained from the measured display characteristics of the corresponding organic-light-emitting-element. The calibration parameters of each organic-light-emitting-element are stored in a calibration memory. One method for creating the compensated video data-signal is by storing into the video memory the compensated video word that is calculated based on the calibration parameters in the calibration memory and by fetching from the video memory the compensated video word. An alternative method for creating the compensated video data-signal is by fetching from the video memory the uncompensated video word and by using the calibration parameters in the calibration memory to calculate the compensated video data-signal.
Inventors
- 👤 Nongqiang Fan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:18
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/36; G09G5/39; G09G5/393; G09G3/00; G09G3/20; G09G3/22; G09G3/30; G09G3/32; G09G3/3208; G09G3/3216; G09G2320/00; G09G2320/02; G09G2320/0233; G09G2320/0285; G09G2320/029; G09G2320/0295; G09G2320/04; G09G2320/043; G09G2320/045; G09G2320/06; G09G2320/0693; G09G2360/00; G09G2360/14; G09G2360/145; G09G2360/147
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
180 words
A method for creating a video data signal compensated for the non-uniformity of an OLED having a matrix of organic-light-emitting-elements, comprising the steps of: measuring the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements by measuring at least one data point on the emission curve; deriving a set of fitting parameters including at least one member for the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements from the measured data points on the emission curve of the corresponding organic-light-emitting-element; storing into a calibration memory the set of fitting parameters for the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements; obtaining the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements by using the set of fitting parameters for the emission curve of the corresponding organic-light-emitting-element fetched from the calibration memory; storing into a video memory having a matrix of memory-cells the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; and creating the compensated video data signal by fetching the compensated video word for each organic-light-emitting-element from the video memory.
Claim 2
Independent Claim
180 words
A method for creating a video data signal compensated for the non-uniformity of an OLED having a matrix of organic-light-emitting-elements, comprising the steps of: measuring the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements by measuring at least one data point on the emission curve; deriving a set of fitting parameters including at least one member for the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements from the measured data points on the emission curve of the corresponding organic-light-emitting-element; storing into a calibration memory the set of fitting parameters for the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements; obtaining the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements by using the set of fitting parameters for the emission curve of the corresponding organic-light-emitting-element fetched from the calibration memory; storing into a video memory having a matrix of memory-cells the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; and creating the compensated video data signal by fetching the compensated video word for each organic-light-emitting-element from the video memory.
Claim 3
Independent Claim
179 words
A method for creating a video data signal compensated for the non-uniformity of an OLED having a matrix of organic-light-emitting-elements, comprising the steps of: measuring the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements by measuring at least one data point on the emission curve; deriving a set of fitting parameters including at least one member for the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements from the measured data points on the emission curve of the corresponding organic-light-emitting-element; storing into a calibration memory the set of fitting parameters for the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements; storing into a video memory having a matrix of memory-cells the uncompensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; obtaining the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements by using the set of fitting parameters for the emission curve of the corresponding organic-light-emitting-element fetched from the calibration memory; and creating the compensated video data signal by using the compensated video word generated from the step of obtaining.
Claim 4
Independent Claim
179 words
A method for creating a video data signal compensated for the non-uniformity of an OLED having a matrix of organic-light-emitting-elements, comprising the steps of: measuring the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements by measuring at least one data point on the emission curve; deriving a set of fitting parameters including at least one member for the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements from the measured data points on the emission curve of the corresponding organic-light-emitting-element; storing into a calibration memory the set of fitting parameters for the emission curve of each organic-light-emitting-element in the matrix of organic-light-emitting-elements; storing into a video memory having a matrix of memory-cells the uncompensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; obtaining the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements by using the set of fitting parameters for the emission curve of the corresponding organic-light-emitting-element fetched from the calibration memory; and creating the compensated video data signal by using the compensated video word generated from the step of obtaining.
Claim 5
Dependent Claim
22 words
A method of claim 1 or 2 wherein the video data signal is in the form of a series of digital word.
Claim 6
Dependent Claim
28 words
A method of claim 1 or 2 wherein the video data signal is in an analog wave form that uses the amplitude representing the luminosity of each pixel.
Claim 7
Dependent Claim
57 words
A method of claim 1 or 2 wherein said step of deriving further comprises the step of storing the measured data points of the emission curve of each organic-light-emitting-element first into a nonvolatile memory; and the step of loading the measured data points of the emission curve of each organic-light-emitting-element into a RAM from the nonvolatile memory.
Claim 8
Dependent Claim
15 words
A method of claim 1 or 2 wherein the calibration memory is a nonvolatile memory.
Claim 9
Dependent Claim
73 words
A method of claim 1 or 2 wherein the calibration memory is a volatile memory and said step of storing the set of fitting parameters further comprises the step of storing the set of fitting parameters for the emission curve of each organic-light-emitting-element first into a nonvolatile memory; and the step of loading the set of fitting parameters for the emission curve of each organic-light-emitting-element into the calibration memory from the nonvolatile memory.
Claim 10
Dependent Claim
109 words
A method of claim 1 or 2 wherein said step of deriving further comprises the step of determining the correct driving parameters for selected gray levels of the organic-light-emitting-element by using the measured data points on emission curve of the corresponding organic-light-emitting-element as the row data; said step of storing into a calibration memory further comprises the step of storing the correct driving parameters for selected gray levels of the organic-light-emitting-element as a partial look-up table; and said step of obtaining further comprises the step of calculating the compensated video word by using the partial look-up table of the corresponding organic-light-emitting-element from the calibration memory as the raw data.
Claim 11
Dependent Claim
100 words
A method of claim 1 or 2 wherein said step of deriving further comprises the step of determining the set of fitting parameters for the emission curve of the organic-light-emitting-element based on a device model by using the measured data points on emission curve of the corresponding organic-light-emitting-element as the row data; and said step of obtaining further comprises the step of calculating the compensated video word by using the device model as the algorithm and by using the set of fitting parameters for the emission curve of the corresponding organic-light-emitting-element fetched from the calibration memory as the raw data.
Claim 12
Dependent Claim
138 words
A video interfacing electronics, for creating a video data signal compensated for the non-uniformity of an OLED having a matrix of organic-light-emitting-elements, having a video memory for storing the video pattern, comprising: a calibration memory having a set of fitting parameters including at least one member for the emission curve stored therein for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; electronic circuitry for obtaining the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements by using the set of fitting parameters for the emission curve of the corresponding organic-light-emitting-element from said calibration memory; electronic circuitry for storing into the video memory the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; and electronic circuitry for creating the compensated video data signal by fetching the compensated video word for each organic-light-emitting-element from the video memory.
Claim 13
Dependent Claim
138 words
A video interfacing electronics, for creating a video data signal compensated for the non-uniformity of an OLED having a matrix of organic-light-emitting-elements, having a video memory for storing the video pattern, comprising: a calibration memory having a set of fitting parameters including at least one member for the emission curve stored therein for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; electronic circuitry for obtaining the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements by using the set of fitting parameters for the emission curve of the corresponding organic-light-emitting-element from said calibration memory; electronic circuitry for storing into the video memory the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; and electronic circuitry for creating the compensated video data signal by fetching the compensated video word for each organic-light-emitting-element from the video memory.
Claim 14
Dependent Claim
144 words
A video interfacing electronics, for creating a video data signal compensated for the non-uniformity of an OLED having a matrix of organic-light-emitting-elements, having a video memory for storing the video pattern, comprising: a calibration memory having a set of fitting parameters including at least one member for the emission curve stored therein for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; electronic circuitry for storing into a video memory having a matrix of memory-cells the uncompensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; electronic circuitry for obtaining the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements by using the set of fitting parameters for the emission curve of the corresponding organic-light-emitting-element fetched from the calibration memory; and electronic circuitry for creating the compensated video data signal by using the compensated video word generated from the electronic circuitry for obtaining.
Claim 15
Dependent Claim
144 words
A video interfacing electronics, for creating a video data signal compensated for the non-uniformity of an OLED having a matrix of organic-light-emitting-elements, having a video memory for storing the video pattern, comprising: a calibration memory having a set of fitting parameters including at least one member for the emission curve stored therein for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; electronic circuitry for storing into a video memory having a matrix of memory-cells the uncompensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements; electronic circuitry for obtaining the compensated video word for each organic-light-emitting-element in the matrix of organic-light-emitting-elements by using the set of fitting parameters for the emission curve of the corresponding organic-light-emitting-element fetched from the calibration memory; and electronic circuitry for creating the compensated video data signal by using the compensated video word generated from the electronic circuitry for obtaining.
Claim 16
Dependent Claim
17 words
A video interfacing electronics of claim 10 or 11 wherein the calibration memory is a nonvolatile memory.
Claim 17
Dependent Claim
62 words
A video interfacing electronics of claim 10 or 11 wherein the calibration memory is a volatile memory, further comprising a nonvolatile memory having the set of fitting parameters for the emission curve of each organic-light-emitting-element stored thereinto; and electronic circuitry for loading the set of fitting parameters for the emission curve of each organic-light-emitting-element into said calibration memory from said nonvolatile memory.
Claim 18
Dependent Claim
34 words
A video interfacing electronics of claim 10 or 11 wherein said electronic circuitry for creating further comprising electronic circuitry for creating the video data signal in the form of a series of digital word.
Claim 19
Dependent Claim
39 words
A video interfacing electronics of claim 10 or 11 wherein said electronic circuitry for creating further comprising electronic circuitry for creating the video data in an analog wave form that uses the amplitude representing the luminosity of each pixel.
Claim 20
Dependent Claim
74 words
A video interfacing electronics of claim 10 or 11 wherein said calibration memory having the correct driving parameters for selected gray levels of each organic-light-emitting-element stored therein as the fitting parameters in the form of a partial look-up table; and said electronic circuitry for obtaining further comprises electronic circuitry for calculating the compensated video word by using the partial look-up table of the corresponding organic-light-emitting-element fetched from said calibration memory as the raw data.
Claim 21
Dependent Claim
85 words
A video interfacing electronics of claim 10 or 11 wherein the fitting parameter for the emission curve of said organic-light-emitting-element being the fitting parameters based on a device model for the emission curve of said organic-light-emitting-element, and said calibration memory having the fitting parameters stored therein; and said electronic circuitry for obtaining further comprises electronic circuitry for calculating the compensated video word by using the device model as the algorithm and by using the fitting parameters fetched from said calibration memory as the raw data.
Claim 22
Independent Claim
56 words
A method for driving an OLED having a matrix of organic-light-emitting-elements driven by a plurality of column drive stages, comprising the steps of: creating a video data signal compensated for the non-uniformity of the OLED; converting the video data signal into corrected driving signals; and applying the corrected driving signals through the relative column drive stages.
Claim 23
Independent Claim
56 words
A method for driving an OLED having a matrix of organic-light-emitting-elements driven by a plurality of column drive stages, comprising the steps of: creating a video data signal compensated for the non-uniformity of the OLED; converting the video data signal into corrected driving signals; and applying the corrected driving signals through the relative column drive stages.
Claim 24
Dependent Claim
27 words
The method of claim 18 for driving an OLED wherein the step of creating includes creating a video data signal with the method of claim 1 .
Claim 25
Dependent Claim
27 words
The method of claim 18 for driving an OLED wherein the step of creating includes creating a video data signal with the method of claim 2 .
Claim 26
Dependent Claim
29 words
The method of claim 18 for driving an OLED wherein the step of creating includes creating a video data signal with the video interfacing electronics of claim 10 .
Claim 27
Dependent Claim
29 words
The method of claim 18 for driving an OLED wherein the step of creating includes creating a video data signal with the video interfacing electronics of claim 11 .
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) | 2005-10-28 | 2006-04-29 | 2006-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-10-28 | 2010-04-29 | 2010-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-10-28 | 2014-04-29 | 2014-10-29 | $7700.00 | Window Closed / Lapsed |