US 8,693,087 B2 · Passive matrix quantum dot display

Abstract

A system and method for operating a light emitting device utilizing charged quantum dots is described. In one embodiment, charged quantum dots are suspended in a liquid between an excitation plate and a cover plate. The excitation plate carries short-wave excitation light. Charged quantum dots near the surface of the excitation plate may emit light in response to an evanescent field generated by the short-wave excitation light undergoing total internal reflection within the excitation plate. The excitation plate and the cover plate may be coated with one or more transparent electrodes. The movement of charged quantum dots within the liquid may be controlled by applying one or more bias voltages to the one or more transparent electrodes. Light emission from a particular region near the surface of the excitation plate may be controlled by moving charged quantum dots into or out of the particular region.

Claims14

Dependent claims

A light emitting device, comprising:

an excitation plate;
a first set of electrodes connected to the excitation plate, at least one electrode of the first set of electrodes is biased to a first voltage at a first point in time, the first set of electrodes is arranged in a first direction;
a second set of electrodes connected to the cover plate, at least one electrode of the second set of electrodes is biased to a second voltage at the first point in time, the second set of electrodes is arranged in a second direction, the second direction is perpendicular to the first direction;
a cover plate;
and
quantum dots, the quantum dots suspended within a liquid between the excitation plate and the cover plate, the quantum dots emit light in response to an evanescent field, the evanescent field is generated by one or more electromagnetic waves undergoing total internal reflection within the excitation plate, the quantum dots are attracted to the at least one electrode of the first set of electrodes at the first point in time.

3 more elements

One or more storage devices containing processor readable code for programming one or more processors to perform a method for operating a display device comprising the steps of:

performing a display refresh operation, the display refresh operation includes moving charged quantum dots into a predetermined region between an excitation plate and a cover plate, the charged quantum dots suspended within a liquid between the excitation plate and the cover plate;
generating a first electric field across a first region at a first point in time, the first region is abutted by the excitation plate on a first side and the cover plate on a second side, the first region includes at least a subset of the charged quantum dots, the generating of the first electric field causes the at least a subset of the charged quantum dots to be attracted to the excitation plate at the first point in time;
and
generating an evanescent field associated with the excitation plate at a second point in time, the second point in time is subsequent to the first point in time, the at least a subset of the charged quantum dots emit light in response to the evanescent field at the second point in time, the evanescent field is generated by one or more light waves undergoing total internal reflection within the excitation plate, the charged quantum dots include large quantum dots and small quantum dots, the large quantum dots emit light of a first color, the small quantum dots emit light of a second color, each of the large quantum dots are larger in size compared with each of the small quantum dots, the first region includes a first barrier, the large quantum dots and the small quantum dots are separated by the first barrier.

1 more element

Dependencies are inferred from the claim text.

Passive matrix quantum dot display

Life of this patent

Passive matrix quantum dot display

Life of this patent

Abstract

Claims14