Feedback based apparatus, systems and methods for controlling emissive pixels using pulse width modulation and voltage modulation techniques
First Claim
1. A method for displaying a frame of an image on a display using an emissive pixel comprising:
- determining the total time period for displaying the frame;
dividing the total time period into a series of time sub-divisions;
selecting some of the time sub-divisions from the series of time sub-divisions;
causing the emissive pixel to display the image on the display during the selected time sub-divisions; and
not causing the emissive pixel to display the image on the display during the other time sub-divisions;
wherein, causing the emissive pixel to display the image on the display by applying a voltage to the emissive pixel.
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Abstract
The present invention provides techniques for emissive pixels of flat panel displays. Specifically, pixel feedback and a combination of voltage modulation and pulse width modulation are used to improve the quality and consistency of aging pixels. Based on feedback, an image frame is divided into sub-frames of various time periods. Also based on feedback, a voltage, or voltages of different voltage levels, is (are) applied to the selected sub-frames to generate an image frame of a particular gray level. The human eye integrates the effects of the voltage and pulse width modulation techniques that are applied to the various sub-frames of the image frame, over the duration of the image frame.
158 Citations
25 Claims
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1. A method for displaying a frame of an image on a display using an emissive pixel comprising:
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determining the total time period for displaying the frame;
dividing the total time period into a series of time sub-divisions;
selecting some of the time sub-divisions from the series of time sub-divisions;
causing the emissive pixel to display the image on the display during the selected time sub-divisions; and
not causing the emissive pixel to display the image on the display during the other time sub-divisions;
wherein,causing the emissive pixel to display the image on the display by applying a voltage to the emissive pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A display system comprising:
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an emissive pixel;
a sensor embedded in the emissive pixel;
a feedback signal line coupled to the sensor;
a feedback circuit coupled to the feedback signal line for receiving a feedback signal from the sensor indicative of the light emitted by the pixel and comparing the feedback signal with a threshold;
an image frame;
a first circuit for dividing the image frame into a plurality of image sub-frames;
a voltage source coupled to the pixel;
a second circuit for selecting some of the plurality of the image sub-frames based on the result of the comparison; and
a third circuit for applying a voltage of the voltage source to the emissive pixel during the selected image sub-frames for displaying the image frame on the display. - View Dependent Claims (19, 20, 21, 22)
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23. A display system comprising:
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an emissive pixel;
a sensor embedded in the emissive pixel;
a feedback signal line coupled to the sensor;
a feedback circuit coupled to the feedback signal line for receiving a feedback signal from the sensor indicative of the light emitted by the pixel;
an image frame;
a first circuit for dividing the image frame into a plurality of image sub-frames;
a voltage source coupled to the pixel;
a second circuit for selecting some of the plurality of the image sub-frames; and
a third circuit for applying a voltage of the voltage source to the emissive pixel during the selected image sub-frames for displaying the image frame on the display;
an integration circuitry for integrating values of the feedback signal received by the feedback circuit during the displaying of the image frame on the display; and
a fourth circuit for comparing a result of the integration with a threshold;
whereinthe third circuit for adjusting a voltage applied to the emissive pixel based on the comparison. - View Dependent Claims (24, 25)
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Specification