Systems and methods of pixel calibration based on improved reference values
First Claim
Patent Images
1. A method for compensating an image produced by an emissive display system having pixels, each pixel having a light-emitting device, the method comprising:
- integrating a pixel current output from the pixel for a pixel integration time generating an integrated pixel current value;
comparing the integrated pixel current value with a reference current including integrating the reference current for a reference integration time generating an integrated reference current value and comparing the integrated reference current value with the integrated pixel current value, generating at least one comparison value; and
adjusting an input for the pixel with use of the at least one comparison value.
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Abstract
What is disclosed are systems and methods of compensation of images produced by active matrix light emitting diode device (AMOLED) and other emissive displays. The electrical output of a pixel is compared with a reference value to adjust an input for the pixel. In some embodiments an integrator is used to integrate a pixel current and a reference current using controlled integration times to generate values for comparison.
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Citations
18 Claims
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1. A method for compensating an image produced by an emissive display system having pixels, each pixel having a light-emitting device, the method comprising:
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integrating a pixel current output from the pixel for a pixel integration time generating an integrated pixel current value; comparing the integrated pixel current value with a reference current including integrating the reference current for a reference integration time generating an integrated reference current value and comparing the integrated reference current value with the integrated pixel current value, generating at least one comparison value; and adjusting an input for the pixel with use of the at least one comparison value. - View Dependent Claims (2, 3, 4)
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5. A method for compensating an image produced by an emissive display system having pixels, each pixel having a light-emitting device, the method comprising:
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integrating a pixel current output from the pixel for a pixel integration time generating an integrated pixel current value; comparing the integrated pixel current value with an analog reference value including storing the stored analog reference value in a capacitor of at least one integrator and comparing the stored analog reference value with the integrated pixel current value, generating at least one comparison value; and adjusting an input for the pixel with use of the at least one comparison value. - View Dependent Claims (6, 7)
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8. A method for compensating an image produced by an emissive display system having pixels, each pixel having alight-emitting device, the method comprising:
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sampling a pixel output from the pixel generating a sampled pixel value; integrating a reference current for a reference integration time generating an integrated reference current value; comparing the sampled pixel value with the integrated reference current value, generating at least one comparison value; and adjusting an input for the pixel with use of the comparison value. - View Dependent Claims (9)
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10. A system for compensating an image produced by an emissive display system having pixels, each pixel having a light-emitting device, the system comprising:
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at least one integrator coupled via a pixel switch to a pixel of said emissive display system for measuring an electrical output of the pixel; a reference current source coupled via a reference switch to the at least one integrator; a comparator digitizer coupled to the at least one integrator for comparing the electrical output of the pixel with a reference signal, generating at least one comparison value; and a data processing unit for adjusting an input for the pixel with use of the at least one comparison value, wherein the reference signal is a reference current produced by the reference current source, wherein the at least one integrator measures the electrical output of the pixel by integrating a pixel current output from the pixel for a pixel integration time generating an integrated pixel current value, the at least one integrator for integrating the reference current for a reference integration time generating an integrated reference current value, and wherein the comparator digitizer compares the electrical output of the pixel with the reference signal by comparing the integrated reference current value with the integrated pixel current value, generating the at least one comparison value. - View Dependent Claims (11, 12, 13)
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14. A system for compensating an image produced by an emissive display system having pixels, each pixel having a light-emitting device, the system comprising:
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at least one integrator coupled via a pixel switch to a pixel of said emissive display system for measuring an electrical output of the pixel; a reference current source coupled via a reference switch to the at least one integrator; a comparator digitizer coupled to the at least one integrator for comparing the electrical output of the pixel with a reference signal, generating at least one comparison value; and a data processing unit for adjusting an input for the pixel with use of the comparison value, wherein the reference signal is a reference current produced by the reference current source, wherein the at least one integrator measures the electrical output of the pixel by sampling a pixel output from the pixel generating a sampled pixel value, the at least one integrator for integrating the reference current for a reference integration time generating an integrated reference current value, and wherein the comparator digitizer compares the electrical output of the pixel with a reference signal by comparing the integrated reference current value with the sampled pixel value, generating the at least one comparison value. - View Dependent Claims (15)
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16. A system for compensating an image produced by an emissive display system having pixels, each pixel having a light-emitting device, the system comprising:
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at least one integrator coupled via a pixel switch to a pixel of said emissive display system for measuring an electrical output of the pixel; a comparator digitizer coupled to the at least one integrator for comparing the electrical output of the pixel with a reference signal, generating at least one comparison value; and a data processing unit for adjusting an input for the pixel with use of the comparison value, wherein the reference signal is an analog reference value, wherein the at least one integrator comprises a capacitor, the at least one integrator for storing the analog reference value in said capacitor, wherein the at least one integrator measures the electrical output of the pixel by integrating a pixel current output from the pixel for a pixel integration time generating an integrated pixel current value, and wherein the comparator digitizer compares the electrical output of the pixel with the reference signal by comparing the stored analog reference value with the integrated pixel current value, generating the at least one comparison value. - View Dependent Claims (17, 18)
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Specification