LCD touch screen
First Claim
1. A touch screen comprising:
- a liquid crystal display having a viewing surface through which light passes into and out of the display and a back surface comprising a transflector for reflecting some of the light back through the display and for transmitting some of the light; and
light detecting means for detecting a change in the light transmitted through the transflector caused by a touching of the viewing surface.
2 Assignments
0 Petitions
Accused Products
Abstract
A touch screen includes a liquid crystal display (LCD) having a viewing surface through which light passes into and out of the display and a back surface comprising a transflector such as transflective film. The transflector reflects some of the light back through the display and viewing surface and transmits some of the light. An array of light dependent resistors (LDRs) or equivalent light detecting devices underlie the transflector and detect a change in the transmitted light caused by a touching of the viewing surface. The light detecting array may be integrated into a keyboard interface. Keys are then displayed on the viewing surface opposite LDRs in the array to indicate where the viewing surface must be touched to actuate a key.
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Citations
15 Claims
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1. A touch screen comprising:
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a liquid crystal display having a viewing surface through which light passes into and out of the display and a back surface comprising a transflector for reflecting some of the light back through the display and for transmitting some of the light; and light detecting means for detecting a change in the light transmitted through the transflector caused by a touching of the viewing surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11)
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9. A touch screen comprising:
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a liquid crystal display having a viewing surface through which light passes into and out of the display and a back surface comprising a transflector for reflecting some of the light back through the display and for transmitting some of the light; light detecting means for detecting a change in the light transmitted through the transflector caused by a touching of the viewing surface; and a keyboard interface having a matrix of conductive lines coupled together at intersections by separate light detecting means, each light detecting means being a key that may be actuated by touching the viewing surface at a location that limits the light transmitted to the light detecting means.
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12. A touch screen comprising:
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a liquid crystal display having a viewing surface through which light passes into and out of the display and a back surface comprising a transflector for reflecting some of the light back through the display and for transmitting some of the light; a plurality of separate light detecting means adjacent to the transflector for detecting a change in the light transmitted through the transflector caused by a touching of the viewing surface; and a keyboard interface comprising a conductive line connected to each separate light detecting means, each such means being a key that may be actuated by touching the viewing surface at a location that limits the light transmitted to the light detecting means sufficiently for the means to change the logic state of a signal on the connected line. - View Dependent Claims (13, 14)
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15. A touch screen comprising:
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a liquid crystal display having a viewing surface through which light passes into and out of the display and a back surface comprising a transflector for reflecting some of the light back through the display and for transmitting some of the light; a plurality of separate light detecting means adjacent to the transflector for detecting a change in the light transmitted through the transflector caused by a touching of the viewing surface; signaling means coupled to the separate light detecting means for producing a signal in response to a detection of a change in transmitted light caused by a touching of the viewing surface, the signal produced indicating the location of the touch; and means for controlling the liquid crystal display to indicate where the viewing surface must be touched for a light detecting means to detect the touch.
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Specification