METHOD AND APPARATUS FOR SENSING, MEASUREMENT OR CHARACTERIZATION OF DISPLAY ELEMENTS INTEGRATED WITH THE DISPLAY DRIVE SCHEME, AND SYSTEM AND APPLICATIONS USING THE SAME
First Claim
1. A method, comprising:
- applying a signal waveform between a first electrode and a second electrode of a display element, wherein the signal alters a state of the display element from a first state to a second state and back to the first state, wherein the transition from the first state to the second state and back to the first state is substantially undetectable to human vision;
measuring an electrical response of the display element in response to the applied signal; and
determining at least one operational characteristic of the display element based on the measured electrical response.
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Accused Products
Abstract
Methods and systems for electrical sensing, measurement and characterization of display elements are described. An embodiment includes integrating the electrical sensing, measurement and characterization with the display drive scheme. This embodiment allows for measurement of DC or operational hysteresis voltages and/or response times of interferometric modulator MEMS devices, for example, to be fully integrated with the display driver IC and/or the display drive scheme. Another embodiment allows these measurements to be performed and used without resulting in display artifacts visible to a human user. Another embodiment allows the measurement circuitry to be integrated with the display driver IC and/or the display drive scheme re-using several existing circuitry components and features, thus allowing for integration of the measurement method and its use relatively easily.
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Citations
27 Claims
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1. A method, comprising:
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applying a signal waveform between a first electrode and a second electrode of a display element, wherein the signal alters a state of the display element from a first state to a second state and back to the first state, wherein the transition from the first state to the second state and back to the first state is substantially undetectable to human vision; measuring an electrical response of the display element in response to the applied signal; and determining at least one operational characteristic of the display element based on the measured electrical response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus, comprising:
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drive circuitry configured to apply a signal between a first electrode and a second electrode of a display element, wherein the signal alters a state of the display element from a first state to a second state and back to the first state, wherein the transition from the first state to the second state and back to the first state is substantially undetectable to human vision; feedback circuitry configured to measure an electrical response of the display element in response to the applied voltage waveform; and a processor configured to control the drive circuitry, receive information indicative of the measured electrical response, and determine at least one operational characteristic of the display element based on the measured electrical response. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A display device, comprising:
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means for applying a signal between a first electrode and a second electrode of a display element, wherein the signal alters a state of the display element from a first state to a second state and back to the first state, wherein the transition from the first state to the second state and back to the first state is substantially undetectable to human vision; means for measuring an electrical response of the display element in response to the applied voltage waveform; and means for receiving information indicative of the measured electrical response and for determining at least one operational characteristic of the display element based on the measured electrical response.
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23. A display device comprising:
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an array of interferometric modulators; drive circuitry configured to apply a signal between a first electrode and a second electrode of at least one of the interferometric modulators, wherein the signal alters a state of the interferometric modulator from a first state to a second state and back to the first state, wherein the transition from the first state to the second state and back to the first state is substantially undetectable to human vision; feedback circuitry configured to measure an electrical response of the interferometric modulator in response to the applied voltage waveform; a processor configured control the drive circuitry, receive information indicative of the measured electrical response, and determine at least one operational characteristic of the interferometric modulator based on the measured electrical response; and a memory device configured to communicate with the processor. - View Dependent Claims (24, 25, 26, 27)
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Specification