Liquid crystal display touch screen having electronics on one side
First Claim
1. An apparatus for providing a control signal including a liquid crystal panel and means for transiently forming transparent windows therein, a source of electromagnetic radiation (EMR) adjacent said panel and positioned to pass EMR through transiently open windows, an EMR detector positioned adjacent said source, a defined EMR path between said source and detector, which path is formed in response to a transiently open window, said path including an area for positioning an object to occlude said EMR, and also including reflective means which directs EMR from said source back in the same general direction to said detector, and timing and logic means correlating the opening of said transient windows and the detection of EMR at said detector to provide a control signal.
4 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for providing a control signal utilizes a liquid crystal panel and means for transiently forming transparent windows therein. There is a source of electromagnetic radiation (EMR) adjacent the panel and positioned to pass EMR through transiently open windows. There is an EMR detector positioned adjacent the source and a defined EMR path between the source and detector which path is formed in response to a transiently open window and includes an area for the positioning of an object to occlude the EMR radiation passing between the source and detector. The path also includes a reflector which directs EMR from the source back in the same general direction to the detector. There is a timing and logic circuit correlating the opening of the transient windows and the detection of EMR at said detector to provide a control signal.
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Citations
18 Claims
- 1. An apparatus for providing a control signal including a liquid crystal panel and means for transiently forming transparent windows therein, a source of electromagnetic radiation (EMR) adjacent said panel and positioned to pass EMR through transiently open windows, an EMR detector positioned adjacent said source, a defined EMR path between said source and detector, which path is formed in response to a transiently open window, said path including an area for positioning an object to occlude said EMR, and also including reflective means which directs EMR from said source back in the same general direction to said detector, and timing and logic means correlating the opening of said transient windows and the detection of EMR at said detector to provide a control signal.
- 12. An apparatus for providing a control signal including a housing, a liquid crystal panel in said housing and means for transiently forming transparent windows therein, a light source in said housing, along one side of said panel and positioned adjacent said windows, a light detector adjacent and shielded from said light source, a light path between said source and detector, said path including a retroreflector along the side of said panel opposite said source, said path, in part, being outside of said housing to provide for the occlusion of light in said light path, and timing and logic means correlating the opening of said transient windows and detection of light at said detector to provide a control signal.
Specification