Methods and systems for detecting selections on a touch screen display

1. A system for a touch screen display system, comprising:

light beam focusing components operable to direct light from a top surface of a touch screen display to imagers operable to capture images using the directed light;

a processing unit operable to receive the one or more captured images and determine positional information for an input device positioned on or near the top surface of the touch screen display using at least one captured images; and

one or more light sources operable to emit light towards the top surface of the touch screen display;

wherein the imagers comprise a fist imager and a second imager and the light beam focusing components comprise a first collimating lens positioned in a first optical path between a first light source and the first imager and a second collimating lens positioned in a second optical path between a second light source and the second imager; and

wherein the first and second imagers and the first and second collimating lenses are constructed below the touch screen display and the light beam focusing components further comprise a first reflector assembly positioned between the first light source and the first collimating lens and a second reflector assembly positioned between the second light source and the second collimating lens.

2. The system of claim 1 , wherein the light beam focusing components further comprise a first straight mirror positioned between the first collimating lens and the first imager and a second straight mirror positioned between the second collimating lens and the second imager.

3. The system of claim 1 , wherein the first light source propagates light at a first wavelength and the second light source propagates light at a second wavelength.

4. A system for a touch screen display system, comprising:

light beam focusing components operable to direct light from a top surface of a touch screen display to one or more imagers operable to capture images using the directed light;

a processing unit operable to receive the one or more captured images and determine positional information for an input device positioned on or near the top surface of the touch screen display using at least one captured images; and

one or more light sources operable to emit light towards the top surface of the touch screen display;

wherein the one or more light sources comprise a first light source propagating light at a first wavelength and a second light source propagating light at a second wavelength;

wherein the one or more imagers comprise a first imager and the light beam focusing components comprise:

a first reflector assembly and a first collimating lens positioned in a first direction, wherein the first collimating lens is constructed below the touch screen display and the first reflector assembly is operable to direct light to the first collimating lens; and

a second reflector assembly and a second collimating lens positioned in a second direction relative to the first direction, wherein the second collimating lens is constructed below the touch screen display and the second reflector assembly is operable to direct light to the second collimating lens.

5. The system of claim 4 , further comprising a beam combiner operable to receive light from the first and second collimating lenses and direct the light to the first imager.

6. The system of claim 5 , wherein the first imager comprises a patterned filter layer operable to discriminate between the light propagating at the first wavelength and the light propagating at the second wavelength.

7. A system for a touch screen display system, comprising:

light beam focusing components operable to direct light from a top surface of a touch screen display to imagers operable to capture images using the directed light;

a processing unit operable to receive the one or more captured images and determine positional information for an input device positioned on or near the top surface of the touch screen display using at least one captured images; and

one or more light sources operable to emit light towards the top surface of the touch screen display;

wherein the imagers comprise a fist imager and a second imager and the light beam focusing components comprise a first Fresnel lens positioned in a first optical path between a first light source and the first imager and a second Fresnel lens positioned in a second optical path between a second light source and the second imager.

8. The system of claim 7 , wherein the first Fresnel lens comprises a first TIR Fresnel lens and the second Fresnel lens comprises a second TIR Fresnel lens.

9. The system of claim 7 , wherein the light beam focusing components further comprise a first curved mirror positioned between the first Fresnel lens and the first imager and a second curved mirror positioned between the second Fresnel lens and the second imager.

10. A system for a touch screen display system, comprising:

light beam focusing components operable to direct light from a top surface of a touch screen display to imagers operable to capture images using the directed light; and

a processing unit operable to receive the one or more captured images and determine positional information for an input device positioned on or near the top surface of the touch screen display using at least one captured images;

wherein the imagers comprise a fist imager and a second imager and the light beam focusing components comprise a first microlens array and a first plurality of guides operable to receive light from a first light source and direct the light to the first imager and a second microlens array and a second plurality of guides operable to receive light from a second light source and direct the light to the second imager.