Liquid crystal display module

• US 5,579,035 A
• Filed: 07/05/1991
• Issued: 11/26/1996
• Est. Priority Date: 07/05/1991
• Status: Expired due to Fees

• Current Assignee: Technomarket LP
• Original Assignee: Technomarket LP
• Inventors: Beiswenger, John L.
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): STOLL, KARA FARNANDEZ
• Application Number:
  US07/726,270
• Time in Patent Office: 1,971 Days
• Field of Search: 340/712, 340/718, 340/719, 340/765, 340/784, 359/48, 359/49, 359/64, 359/83, 341/31, 362/32, 361/399, 248/917, 345/169, 345/175, 345/206
• US Class Current: 345/169
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/1336 Illuminating devices
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

A liquid crystal display module comprises a liquid crystal display and a housing which carries the display, typically of C-shaped cross section with the liquid crystal display being attached to opposed ends of the C-shaped cross section of the housing. A conductor carried by the housing provides electronic communication between electronic circuitry and the liquid crystal display. A pair of light pipes are respectively positioned adjacent opposed edges of the housing, a first of the light pipes being connected to a source of light and the other of the light pipes being connected to a sensor for the light. The light pipes each define spaced branches positioned so that spaced light beams can be emitted from the branches of the first light pipe to pass through the liquid crystal display and to be received by the other light pipe through the branches thereof, to be sensed by the sensor. Control means are capable of sequentially and transiently forming transparent and opaque windows in the liquid crystal display at positions where the spaced light beams pass through the liquid crystal display. Timer and logic circuitry are provided for correlating a signal received from the sensor with an individual light beam that creates a signal. Thus, occlusion of at least one of the spaced light beams with a finger or the like causes a specific, characteristic response by the timer and logic circuitry to provide electronic choices by simple positioning of the finger in the manner of an electronic switch.

Claims

1. A liquid crystal display module which comprises:

a liquid crystal display;

a housing of essentially C-shaped cross section, said liquid crystal display being attached to opposed ends of the C-shaped cross section of said housing;

electronic control means positioned on said housing, a least some of said electronic control means being carried on the side of the said housing which is opposed to said liquid crystal display; and

conductor means carried by said housing and providing electronic communication between said electronic control means and said liquid crystal display, at least part of said conductor means extending about an outer, curved surface portion of said housing defined by said C-shaped cross section.

2. The display module of claim 1 in which said conductor means comprises at least in part conductive, printed circuit lines adhering to said housing.

3. The display module of claim 1 in which said housing carries, within said C-shaped cross section, a light source comprising at least one light bulb to provide back illumination of said liquid crystal display.

4. The liquid crystal display module of claim 1 in which said C-shaped housing is made of plastic extruded in said C-shaped cross-section.

5. The liquid crystal display module of claim 1 in which said housing is substantially rigid, to provide protection and support to said liquid crystal display.

6. The liquid crystal display module of claim 1 in which said conductor means and liquid crystal display are electrically connected with an electrically conductive adhesive.

7. The liquid crystal display module of claim 1 in which said C-shaped housing defines a projection on an edge of said housing that extends parallel to said C-shaped cross section, some of said conductor means being carried on said projection, to define an edge connector for connection of said conductor means and liquid crystal display to other circuitry.

8. A liquid crystal display module which comprises:

a liquid crystal display;

a housing;

conductor means carried by said housing and providing electronic communication between electronic control means and said liquid crystal display;

a pair of light pipes respectively positioned adjacent opposed edges of said housing, a first of said light pipes being connected to a source of light and the other of said light pipes being connected to a sensor for said light, said light pipes each defining a plurality of spaced branches positioned whereby a plurality of spaced light beams can be emitted from the branches of said first light pipe, and can pass through said liquid crystal display, and can be received by the other light pipe through the branches thereof to be sensed by said sensor;

said electronic control means being capable of sequentially and transiently forming transparent and opaque windows in said liquid crystal display at positions where said spaced light beams pass through said liquid crystal display; and

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

9. The module of claim 8 in which said light pipes are substantially covered with an internally reflective surface except at ends of said spaced branches.

10. The module of claim 8 in which said branches are positioned to direct light beams transversely of said liquid crystal display.

11. The module of claim 10 in which a transparent plate is carried on the side of said liquid crystal display opposite to that of said light pipes, said transparent plate carrying pairs of spaced 90°

reflector members positioned to direct each said spaced light beam from the first light pipe through two angled reflections along a light path that enters a respective branch of said other light pipe, said reflector members directing said spaced light beams along paths that extend outside of said plate to permit occlusion thereof.

12. The module of claim 8 in which said source of light emits infrared light.

13. The module of claim 8 including a second light source comprising at least one light bulb to provide back illumination of said liquid crystal display, said second light source providing a different type of light from the light provided to said light pipes, said sensor being insensitive to said different type of light, said different type of light being a visible light.

14. The module of claim 8 in which added light emitter and receptor means, connected to said timer and logic means, are provided to emit and receive at least one second light beam that crosses said spaced light beams in a position permitting simultaneous occlusion of both a spaced light beam and a second light beam with said opaque member, to provide two dimensional location of said opaque member.

15. The module of claim 8 in which said housing is of essentially C-shaped cross section, said liquid crystal display being attached to opposed ends of the C-shaped cross section of the housing.

16. A liquid crystal display module which comprises:

a liquid crystal display;

a housing of essentially C-shaped cross section, said liquid crystal display being attached to opposed ends of the C-shaped cross section of the housing;

conductor means carried by said housing and providing electronic communication between electronic control means and said liquid crystal display;

a pair of light pipes respectively positioned adjacent opposed edges of said housing, a first of said light pipes being connected to a first source of light and the other of said light pipes being connected to a sensor for said light, said light pipes each defining a plurality of spaced branches positioned whereby a plurality of spaced light beams can be emitted from the branches of said first light pipe and can pass through said liquid crystal display, and can be received by the other light pipe through the branches thereof to be sensed by said sensor;

said control means being capable of sequentially and transiently forming transparent and opaque windows in said liquid crystal display at positions where said spaced light beams pass through said liquid crystal display;

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

and a second light source comprising at least one light bulb to provide back illumination of said liquid crystal display, said second light source providing a different type of light from the light provided to the light pipes, said sensor being insensitive to said different type of light, said different type of light being a visible light.

17. The module of claim 16 in which said branches are positioned to direct light beams transversely of said liquid crystal display, and in which a transparent plate is carried on the side of said liquid crystal display opposite to that of said light pipes, said transparent plate carrying a pair of spaced 90 degree reflector members positioned to direct each of said spaced light beam from the first light pipe through two angled reflections along a light path that enters a respective branch of said other light pipe, said reflector members directing said spaced light beams along said paths outside of said plate to permit occlusion thereof.

18. The module of claim 17 in which said first source of light emits infrared light.

19. The module of claim 16 in which at least some of said electronic control means is carried on the side of said C-shaped housing which is opposed to said liquid crystal display, at least part of said conductor means extending about an outer, curved surface portion of said housing defined by said C-shaped cross section.

20. The display module of claim 19 in which said conductor means comprises at least in part conductive, printed circuit lines adhering to said housing, said conductor means and liquid crystal display being electrically connected with an electrically conductive adhesive.

21. A liquid crystal display module which comprises:

a liquid crystal display;

a housing of essentially C-shaped cross section, said liquid crystal display being attached to opposed ends of the C-shaped cross section of said housing;

electronic control means positioned on said housing;

conductor means carried by said housing and providing electronic communication between said electronic control means and said liquid crystal display, at least some of said electronic control means being carried on the side of said housing which is opposed to said liquid crystal display, at least part of said conductor means extending about an outer, curved surface portion of said housing defined by said C-shaped cross section;

and said housing carrying, within said C-shaped cross section, a light source comprising at least one light bulb to provide back illumination of said liquid crystal display.

22. The display module of claim 21 in which said conductor means comprises at least in part conductive, printed circuit lines adhering to said housing.

23. The liquid crystal display module of claim 22 in which said C-shaped housing is made of plastic extruded in said C-shaped cross section.

24. The liquid crystal display module of claim 23 in which said conductor means and liquid crystal display are electrically connected with an electrically conductive adhesive.