VOLTAGE FEEDBACK CIRCUIT FOR ACTIVE MATRIX REFLECTIVE DISPLAY DEVICES
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Abstract
The present invention is a driving circuit for use with reflective display devices. In a preferred embodiment, the display device is a pixilated, active matrix electrochromic device. The inventive circuit includes a sampling capacitor and a plurality of inverters. The sampling circuit quickly stores a data voltage. Addressing of a plurality of electrochromic pixels in an active matrix is thereby accelerated. The inverters are coupled to a relatively high and low power source for quickly driving the electrochromic pixel to the stored data voltage. The circuit of the present invention permits rapid refreshing of electrochromic pixels in an active matrix and achieves color gradients without bleaching and recharging the electrochromic pixel.
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Citations
29 Claims
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1-22. -22. (canceled)
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23. A method of charging a reflective display pixel, the method comprising:
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electrically isolating the reflective display pixel from a data line in response to commencement of an addressing phase; storing a data signal received from the data line; coupling the reflective display pixel to the stored data signal in response to completion of the addressing phase; amplifying the data signal to produce a driving signal; and applying the driving signal to the reflective display pixel; feeding back an electrical potential of the reflective display pixel such that the electrical potential of the reflective display pixel becomes equal to the stored data signal.
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29. A circuit for charging a reflective display pixel, the circuit comprising:
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means for selectively isolating the reflective display pixel from a data signal in response to commencement of an addressing phase; means for sampling the data signal; means for coupling the reflective display pixel to the means for sampling the data signal in response to completion of the addressing phase; means for amplifying the data signal to produce a driving potential; means for applying the driving potential to the reflective display pixel; and means for feedback of an electrical potential of the reflective display pixel such that the electrical potential of the reflective display becomes equal to the sampled data signal.
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Specification