Image display
AssigneeHewlett-Packard Development Company, L.P.
InventorsDaryl Anderson, John M. da Cunha
Life of this patent
Estimating the term…
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.
Claims37
A display cell, comprising:
- a light sensor;
- a display element coupled to the light sensor;
- and
- a memory coupled to the light sensor.
A display, comprising a plurality of display cells, at least one of the display cells comprising:
- a light sensor;
- a display element coupled to the light sensor;
- and
- a memory coupled to the light sensor.
An optically addressable display system, comprising:
- 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 light beam;
- a display, comprising:
- a plurality of display cells, each comprising:
- light sensing means for responding to at least one raster light beam;
- and
- means for light display coupled to the light sensing means;
- and
- means for memory coupled to the light sensing means.
A display cell, comprising:
- means for light sensing;
- means for light emitting coupled to the means for light sensing;
- and
- means for memory coupled to the means for light sensing.
A method for displaying images, comprising:
- positioning a raster light beam to activate a light sensor;
- charging an energy storage element with the activated light sensor;
- activating a display element using the charged energy storage element;
- positioning the raster light beam to deactivate the light sensor;
- discharging the energy storage element;
- and
- keeping the display element active until the energy storage element is substantially discharged.
A method for displaying images using an array of display cells each having at least one display element, comprising:
- providing power to the display cells to turn each display element off;
- storing a previous state for each display cell as “off”;
- indexing a raster scanning source to a display cell;
- determining whether a desired light output state is “on” or “off” for the display cell;
- and
- activating a raster light beam of the raster scanning source if the 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”.
A display cell, comprising:
- a field effect transistor (FET) having a gate, a source, and a drain:
- a photo diode having a cathode and an anode, 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;
- and
- a resistor coupled between the FET gate and the FET source.
A display cell, comprising:
- a state machine having an input and an output;
- a photo diode having a cathode and an anode, wherein the photo diode cathode is coupled to the toggle flip-flop input;
- a field effect transistor (FET) having a gate, a drain, and a source, wherein the gate is coupled to the toggle flip-flop output;
- and
- 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.
Dependencies are inferred from the claim text.