FRONT LIGHT BASED OPTICAL TOUCH SCREEN
First Claim
Patent Images
1. A display device comprising:
- a light guide having a forward and a rearward surface, the light guide further comprising a plurality of edges between the forward and the rearward surfaces;
at least one light source configured to inject light into the light guide such that light propagates through the light guide;
a plurality of turning features configured to direct light propagating through the light guide towards the rearward surface of the light guide;
at least one array of sensors disposed forward of the light guide; and
at least a first reflector configured to receive a portion of the light propagating within the light guide that exits the light guide through one of the edges and to direct said portion of the light towards the array of sensors.
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Abstract
Systems and methods, to integrate an optical touch screen with a display device comprising a front illumination system, are disclosed. Disclosed embodiments comprise a front illumination system, a display device further comprising a plurality of light-modulating elements (e.g. interferometric modulators), a plurality of reflectors and a plurality of sensor arrays. Light from the front illumination system not directed towards the display device is reflected by the reflectors towards the sensor arrays.
156 Citations
60 Claims
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1. A display device comprising:
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a light guide having a forward and a rearward surface, the light guide further comprising a plurality of edges between the forward and the rearward surfaces; at least one light source configured to inject light into the light guide such that light propagates through the light guide; a plurality of turning features configured to direct light propagating through the light guide towards the rearward surface of the light guide; at least one array of sensors disposed forward of the light guide; and at least a first reflector configured to receive a portion of the light propagating within the light guide that exits the light guide through one of the edges and to direct said portion of the light towards the array of sensors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A display device comprising:
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a means for guiding light having a forward and a rearward surface, the light guiding means further comprising a plurality of edges between the forward and the rearward surfaces; at least one light emitting means configured to inject light into the light guiding means such that light propagates within the light guiding means; a plurality of means for turning light configured to direct light propagating within the light guiding means towards the rearward surface of the light guiding means; means for sensing light disposed forward of the light guiding means; and at least one means for reflecting light configured to receive a portion of the propagating light that exits the light guiding means through one of the edges and to direct said portion of the light towards the array of sensing means. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52)
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53. A method of manufacturing a display device, the method comprising:
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providing a light guide comprising a forward and a rearward surface and a plurality of edges between said forward and rearward surfaces; providing at least one light source configured to inject light into the light guide such that light propagates through the light guide; including a plurality of turning features on the light guide, said turning features configured to direct light propagating through the light guide towards the rearward surface of the light guide; providing at least one array of sensors disposed forward of the light guide; and providing at least one reflector configured to receive a portion of the light propagating within the light guide that exits the light guide through one of the edges and to direct said portion of the light towards the array of sensors. - View Dependent Claims (54, 55)
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56. A method of using a display device comprising an optical touch screen, the method comprising:
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injecting light from a light source into a light guide comprising a forward and a rearward surface and including a plurality of edges between said forward and rearward surfaces; propagating the injected light through the light guide; redirecting a portion of the propagated light that exits the light guide towards at least one array of sensors using at least one reflector, said at least one array of sensors comprising a plurality of sensors configured to sense the redirected light; forming a sheet of light forward of the light guide, said sheet of light comprising the redirected light; and determining a position of an object obstructing said sheet of light by detecting a change of state in one or more sensors. - View Dependent Claims (57, 58, 59, 60)
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Specification