Image display
First Claim
Patent Images
1. A display cell, comprising:
- a light sensor optically addressable within the display cell directly, without intermediary transmission, by an external raster scanning light beam;
a display element coupled to the light sensor, where the light sensor within the display cell controls the display element in response to the external raster scanning light beam; and
a memory coupled to the light sensor, wherein the memory provides an “
on-time”
to the display element which matches a length of time between scans of the external raster scanning light beam, whereby the display element remains on until a next scan of the external raster scanning light beam.
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Abstract
A display cell includes a light sensor, a display element coupled to light sensor; and a memory coupled to the light sensor. A display and an optically addressable display system using a display cell are provided. Methods for using a display cell are also provided.
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Citations
37 Claims
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1. A display cell, comprising:
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a light sensor optically addressable within the display cell directly, without intermediary transmission, by an external raster scanning light beam; a display element coupled to the light sensor, where the light sensor within the display cell controls the display element in response to the external raster scanning light beam; and a memory coupled to the light sensor, wherein the memory provides an “
on-time”
to the display element which matches a length of time between scans of the external raster scanning light beam, whereby the display element remains on until a next scan of the external raster scanning light beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A display, comprising a plurality of display cells, at least one of the display cells comprising:
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a light sensor optically addressable within the display cell directly, without intermediary transmission, by an external raster scanning light beam; a display element coupled to the light sensor, where the light sensor within the display cell controls the display element in response to the external raster scanning light beam; and a memory coupled to the light sensor, wherein the memory provides an “
on-time”
to the display element which matches a length of time between scans of the external raster light beam, whereby the display element remains on until a next scan of the external raster scanning light beam. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. An optically addressable display system, comprising:
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a controller configured to receive image data; a raster scanning source coupled to the controller, wherein the raster scanning source can generate at least one raster scanning light beam; a display, comprising;
a plurality of display cells, each comprising;light sensing optically addressable means within each of the plurality of display cells for responding directly, without intermediary transmission, to at least one raster scanning light beam positioned externally to the display; and means for light display coupled to the light sensing means where the light sensing optically addressable means controls the means for light display in response to the at least one raster scanning light beam; and means for memory coupled to the light sensing means, wherein the means for memory provides an “
on-time”
to the display element which matches a length of time between scans of the at least one raster scanning light beam, whereby the display element remains on until a next scan of the external raster scanning light beam.
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30. A display cell, comprising:
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means for light sensing being optically addressable within the display cell directly, without intermediary transmission, by an external scanning light means; means for light emitting coupled to the means for light sensing where the means for light sensing within the display cell controls the means for light emitting in response to the external scanning light means; and means for memory coupled to the means for light sensing, wherein the means for memory provides an “
on-time”
to the display element which matches a length of time between scans of the external scanning light means, whereby the display element remains on until a next scan of the external raster scanning light means.
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31. A method for displaying images on an optically addressable display, comprising:
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positioning a raster scanning light beam external to the optically addressable display to directly, without intermediary transmission, activate a light sensor; charging an energy storage element upon the light sensor of the optically addressable display being activated with the raster scanning light beam; activating a display element using the charged energy storage element; positioning the raster scanning light beam external to the optically addressable display to directly, without intermediary transmission, deactivate the light sensor; discharging the energy storage element; and keeping the display element on until a next scan of the raster scanning light beam. - View Dependent Claims (32, 33)
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34. A method for displaying images using an array of optically addressable display cells each having at least one display element, comprising:
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providing power to the display cells to turn each display element off; storing a previous state for each display cell as “
off”
;optically indexing an external raster scanning source to a display cell; determining whether a desired light output state is “
on”
or “
off”
for the display cell;activating a raster light beam of the external raster scanning source to directly address, without intermediary transmission, the display cell if a logical exclusive-or (XOR) of the previous state for the display cell and the desired light output state for the display cell computes as “
on”
; andmaintaining the display cell on until a next scan of the raster light beam. - View Dependent Claims (35)
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36. A display cell, comprising:
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a field effect transistor (FET) having a gate, a source, and a drain; a photo diode having a cathode and an anode, the photo diode responsive to an external raster scanning light beam addressed directly, without intermediary transmission, to the display cell and wherein the photo diode cathode is coupled to the FET gate; a light emitting diode (LED) having a cathode and an anode, wherein the LED anode is coupled to the FET source or wherein the LED cathode is coupled to the FET drain; an energy storage element coupled between the FET gate and the FET source; a resistor coupled between the FET gate and the FET source; and maintaining the LED on until a next scan of the external raster scanning light beam.
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37. A display cell, comprising:
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a state machine having an input and an output; a photo diode having a cathode and an anode, the photo diode responsive to an external raster light beam addressed directly, without intermediary transmission, to the display cell and wherein the photo diode cathode is coupled to a toggle flip-flop input; a field effect transistor (FET) having a gate, a drain, and a source, wherein the gate is coupled to a toggle flip-flop output; a light emitting diode (LED) having an anode and a cathode, wherein the LED anode is coupled to the FET source or wherein the LED cathode is coupled to the FET drain; and maintaining the LED on until a next scan of the external raster light beam.
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Specification