Control and display system

• US 4,847,606 A
• Filed: 08/25/1987
• Issued: 07/11/1989
• Est. Priority Date: 08/25/1987
• Status: Expired due to Fees

• Current Assignee: Technomarket Opportunity Fund, L.P.
• Original Assignee: Oak Industries, Inc. (Corning Incorporated)
• Inventors: Beiswenger, John L.
• Primary Examiner(s): Moore, David K.
• Assistant Examiner(s): Brier, Jeffrey A.
• Application Number:
  US07/089,138
• Time in Patent Office: 686 Days
• Field of Search: 340/712, 340/784, 340/365 P, 350/330, 350/331 R, 350/332, 350/345, 250/221, 341/31
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0238 Programmable keyboards key guide holders G06F3/0224
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

A control system comprises a liquid crystal display panel; a light source; and a light detector. Light from the source is directed through at least a portion of the liquid crystal display panel to the light detector. A control circuit is provided for holding the liquid crystal display in generally opaque condition while preferably sequentially momentarily clarifying segments of the portion, whereby momentary, sequential, transversely spaced light beams are generated between the light source and the light detector. A timer and logic circuit is provided for correlating signals received from the light detector with generated, individual, spaced light beams that create the signals. Accordingly, occlusion of at least one of the individual light beams with an opaque member causes a specific characteristic response by the timer and logic circuit. In other words, when one of the individual light beams is occluded, the timer and logic circuit emits a characteristic signal which might activate a relay, send an instruction to a microprocessor, or cause some other action.

Claims

1. A control system which comprises:

a liquid crystal panel;

light source;

light detector means, means for directing light through at least a portion of said liquid crystal panel to said light detector means;

control means connected to said detector means and for transiently forming at least one transparent window in said liquid crystal panel at a position to permit said light to pass from said light source, through said panel, and to said light detector means, the occlusion of light passing through said panel window causing said control means to provide a control signal.

2. The control system of claim 1 in which said control means is capable of transiently forming transparent windows in said panel having differing positions on said panel to permit passage of spaced portions of said light beam.

3. A control system which comprises:

a liquid crystal panel;

a light source;

light detector means;

means for directing light through at least a portion of said liquid crystal panel to said light detector means;

control means for holding said liquid crystal panel portion in generally opaque condition while sequentially momentarily clarifying segments of said portion, whereby momentary, sequential, transversely spaced light beams are generated between said light source and light detector means;

timer and logic means for correlating a signal received from said light detector means with the individual light beam that creates said signal, whereby occlusion of at least one of said individual light beams with an opaque member causes a specific, characteristic response by said timer and logic means.

4. The control system of claim 3 in which said light source and light detector means are positioned within a housing, the beams of light between said light source and said light detector means leaving said housing add reentering said housing again to pass across an external, exposed area, to permit selective occlusion of said beams by an opaque member in said external exposed area.

5. The control system of claim 3 in which said timer and logic means causes display of indicia on a liquid crystal panel section that correlates with the light beams to provide a visual display control system.

6. The control system of claim 5 in which the same liquid crystal panel serves to display said indicia and to sequentially momentarily clarify said segments.

7. The control system of claim 3 in which said light detector means is monolithic.

8. The control system of claim 3 in which said light source is monolithic.

9. The control system of claim 3 in which a second liquid crystal panel is provided and positioned whereby the same light can pass through clarified portions of both liquid crystal panels, said control means also holding said second liquid crystal panel in generally opaque condition while sequentially momentarily clarifying segments of said second panel, whereby said individual, spaced, light beams pass through clarified portions of both said panels for less spreading of said beams at said light detector means.

10. The control system of claim 9 in which a space is provided between said liquid crystal panels for insertion of an opaque member to occlude at least one of each of said intersecting individual light beams.

11. The control system of claim 3 in which an added liquid crystal panel is positioned to intersect added beams of light which travel in a different direction from and intersect said spaced light beams;

means for producing said added beams of light on one side of said added liquid crystal panel;

means for detecting said added light beams on the other side of the added liquid crystal panel;

said control means also being capable of holding at least a portion of said added liquid crystal panel in generally opaque condition while sequentially momentarily clarifying segments of said added liquid crystal panel portion in a manner that correlates with the pattern of momentarily clarified segments of the other liquid crystal panel portion, said means for detecting said added light beams being in electronic communication with said timer and logic means, whereby the position of at least one opaque object that occludes said intersecting light beams may be located by said control system in a 2-dimensional field and varying electronic responses may be initiated depending on said position.

12. A control system which comprises:

a liquid crystal panel;

a light source;

light detector means;

means for directing light through at least a portion of said liquid crystal panel to said light detector means;

control means for holding the liquid crystal panel portion in generally opaque conditions while sequentially momentarily clarifying segments, of said portion, whereby momentary, sequential, transversely spaced light beams are generated between said light source and light detector means;

timer and logic means for correlating a signal received from said light detector means with the individual light beam that creates said signal, whereby occlusion of at least one of said individual light beams with an opaque member causes a specific, characteristic response by said timer and logic means, said light source and light detector means being positioned within a housing, the beams of light between said light source and said light detector means leaving said housing and reentering said housing again to pass across an external, exposed area, to permit selective occlusion of said beams by the opaque member in said external exposed area, said timer and logic means causing a display of indicia on a liquid crystal panel section that correlates with the light beams to provide a visual display control system.

13. The control system of claim 12 in which a second liquid crystal panel is provided and positioned whereby the same light can pass through clarified. portions of both liquid crystal panels, said control means also holding said second liquid crystal panel in generally opaque condition while sequentially momentarily clarifying segments of said second panel, whereby said individual, spaced, light beams pass through clarified portions of both said panels for less spreading of said beams at said light detector means.

14. The control panel of claim 12 in which an added liquid crystal panel is positioned to intersect added beams of light which travel in a different direction from and intersect said spaced light beams;

means for producing said added beams of light on one side of said added liquid crystal panel;

means for detecting said added light beams on the other side of the added liquid crystal panel;

said control means also being capable of holding at least a portion of said added liquid crystal panel in generally opaque condition while sequentially momentarily clarifying segments of said added liquid crystal panel portion in a manner that correlates with the pattern of momentarily clarified segments of the other liquid crystal panel portion, said means for detecting said added light beams being in electronic communication with said timer and logic means, whereby the position of at least one opaque object that occludes said intersecting light beams may be located by said control system in a 2-dimensional field and varying electronic responses may be initiated depending on said position.

15. The control system of claim 14 in which said light detector means and said light source are monolithic.

16. The control system of claim 14 in which at least one liquid crystal panel serves to display indicia and also to sequentially momentarily clarify said segments.

17. The control system of claim 14 in which a space is provided between said liquid crystal panels for insertion of an opaque member to occlude at least one of each of said intersecting individual light beams.

18. A control system which comprises:

a liquid crystal panel;

a light source;

light detector means;

means for directing light through at least a portion of said liquid crystal panel to said light detector means;

control means for holding said liquid crystal panel portion in generally opaque condition while sequentially momentarily clarifying segments of said portion, whereby momentary, sequential, transversely spaced light beams are generated between said light source and light detector means;

timer and logic means for correlating a signal received from said light detector means with the individual light beam that creates said signal;

in which a second liquid crystal panel is provided and positioned whereby the same light can pass through clarified portions of both liquid crystal panels, said control means also holding said second liquid crystal panel in generally opaque condition while sequentially momentarily clarifying segments of said second panel, whereby said individual, spaced light beams pass through clarified portions of both said panels for less spreading of said beams at said light detector means, the occlusion of at least one of said individual light beams with an opaque member causes a specific, characteristic response by said timer and logic means; and

further in which an added liquid crystal panel is positioned to intersect added beams of light which travel in a different direction from and intersect said spaced light beams, means for producing said added beams of light on one side of said added liquid crystal panel;

means for detecting said added light beams on the other side of the added liquid crystal panel;

said control means also being capable of holding at least a portion of said added liquid crystal panel in generally opaque condition while sequentially momentarily clarifying segments of said added liquid crystal panel portion in a manner that correlates with the pattern of momentarily clarified segments of the other liquid crystal panel portion, said means for detecting said added light beams being in electronic communication with said timer and logic means, whereby the position of at least one opaque object that occludes said intersecting light beams may be located by said control system in a 2-dimensional field and varying electronic response may be initiated depending on said position.

19. The control system of claim 18 in which a space is provided between said liquid crystal panels for insertion of an opaque member to occlude at least one of each of said intersecting, individual light beams.

20. A method of producing a series of transversely spaced, sequential beams of light by gating light through a liquid crystal panel, and sequentially momentarily clarifying spaced segments of at least a portion of said liquid panel while holding adjacent portions of said panel in generally opaque condition, and thereafter sensing said momentary, sequential, transversely spaced light beams with light detector means;

correlating a signal received by said light detector means with the individual light beam that created said signal by the time which they are sensed by the light detector means.

21. The method of claim 20 including the step of occluding at least one of said individual light beams with an opaque member to cause a specific, characteristic response by said timer and logic means.

22. The method of claim 21 in which the sequentially momentarily clarifying segments of said liquid crystal panel is rapidly cycled with a frequency of more than one cycle per second.

23. An apparatus for providing a control signal including a liquid crystal panel and means for transiently forming transparent windows therein, a light source positioned to direct light through a transiently open window, a detector positioned to detect light passing through a transiently open window, timing and logic means connected to said detector and correlating the opening of said windows, whereby the occlusion of light passing through a window will cause said timing and logic means to provide a control signal representative thereof.

24. The apparatus of claim 23 further characterized by and including a second liquid crystal panel and means for transiently forming transparent windows therein, a second light source arranged on an axis intersecting the axis of said first light source and positioned to direct light through a transiently open window in said second liquid crystal panel, a second detector positioned to detect light from said second light source passing through a transiently open window in said second liquid crystal panel, said timing and logic means being connected to both of said detectors whereby the occlusion of light passing through a window in each panel will cause said timing and logic means to provide a control signal representative of the position of said occluding object along the axes of said light sources.