Liquid crystal display calculator construction

• US 4,104,727 A
• Filed: 09/23/1976
• Issued: 08/01/1978
• Est. Priority Date: 09/23/1975
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ishii, Mitsuo, Inoue, Yukihiro, Sato, Yuuichi, Fujisawa, Isao, Hashimoto, Shintaro, Washizuka, Isamu, Takeda, Yoshio, Kakumae, Masaru, Hashimoto, Sadakatsu, Kitanishi, Yoshitomo
• Primary Examiner(s): Smith, Jerry
• Application Number:
  US05/725,928
• Time in Patent Office: 677 Days
• Field of Search: 235/152, 235/156, 29/569 L, 29/571, 29/577, 29/589, 29/592, 200/5 A, 350/160 LC
• US Class Current: 361/679.09
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G06F 15/0216 Constructional details or arrangements
• CPC Class Codes: G06F 15/0225 User interface arrangements, e.g. keyboard, display; Interfaces to other computer systems
• CPC Class Codes: H01H 13/702 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
• CPC Class Codes: H01H 13/785 characterised by the material of the contacts, e.g. conductive polymers
• CPC Class Codes: H01H 2201/026 non precious
• CPC Class Codes: H01H 2201/03 Composite
• CPC Class Codes: H01H 2207/004 Printed circuit tail
• CPC Class Codes: H01H 2213/002 with external pressure
• CPC Class Codes: H01H 2219/01 Liquid crystal
• CPC Class Codes: H01H 2221/026 Guiding or lubricating nylon
• CPC Class Codes: H01H 2221/054 connected by flexible webs
• CPC Class Codes: H01H 2223/034 Bezel
• CPC Class Codes: H01H 2229/016 Selective etching
• CPC Class Codes: H01H 2229/038 Folding of flexible printed circuit
• CPC Class Codes: H01H 2231/002 Calculator, computer
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

In an electronic calculator essentially comprising a multidigit display, a keyboard and a data processor unit, a multidigit liquid crystal display is deposited together with integral key actuators of the keyboard on a flexible circuit film which carries electrical conductor leaves in a desired pattern. The conductor leaves to be in contact with terminals of the liquid crystal display are formed to extend in the direction of length of the liquid crystal display to thereby establish room for a battery compartment.

Claims

1. An electronic calculator comprising:

keyboard means having a plurality of integral key actuators for introducing data into said calculator on which computations are to be preformed;

a data processor unit implemented with an LSI semiconductor chip for performing computation functions on the data introduced by said keyboard means;

a multi-digit liquid crystal display means for displaying data introduced by said keyboard means and results of the computation functions performed by said data processor unit, said liquid crystal display means having a portion with electrical terminals thereon which extends from one end of said display means and supports said LSI semiconductor chip thereon;

a printed circuit flexible film having electrical leaf conductors formed thereon in a predetermined pattern, said electrical leaf conductors having portions which define electrical key contacts for cooperation with said key actuators and terminals for interconnection with said terminals of said liquid crystal display; and

means for holding said electrical key contacts of said printed circuit flexible film in juxtaposition to said respective key actuators and said terminals of said film into contact with said terminals of said liquid crystal display.

2. An electronic calculator of claim 1, wherein said liquid crystal display comprises a pair of glass sheets and a layer of liquid crystal composition sandwiched between said glass sheets, one of said glass sheets having a longitudinal extension beyond one end of the other glass sheet, said extension comprising the electrical terminal portion of said liquid crystal display means.

3. An electronic calculator as set forth in claim 2 wherein one or more batteries are provided within a cavity defined by the extension of the glass sheet of said multi-digit liquid crystal display and the integral key actuators of said keyboard.

4. An electronic calculator as set forth in claim 3 wherein electrical connection between said batteries and said printed circuit flexible film are provided on said extension of the glass sheet.

5. An electronic calculator as set forth in claim 4 wherein the connection means between said batteries and said printed circuit flexible film comprise a leaf spring secured directly on said extension of the glass sheet to contact the batteries.

6. An electronic calculator as set forth in claim 2 wherein said data processor LSI chip is mounted on said extension of the glass sheet.

7. An electronic calculator as set forth in claim 6 wherein the LSI chip is photobonded to said longitudinal extension of said glass sheet.

8. An electronic calculator as set forth in claim 1 wherein said keyboard is of the sealed type where the key contact carrying printed circuit flexible film is folded and attached together at the periphery by means of adhesive.

9. An electronic calculator of claim 1, wherein said key contacts of said flexible film are formed in spaced pairs disposed in opposed relationship, whereby the actuation of a corresponding key actuator causes engagement between the opposed contacts of the respective pairs.

10. An electronic calculator of claim 9, wherein said printed circuit flexible film is folded at an intermediate portion to provide two opposed substantially planar surfaces and said spaced pairs of key contacts are formed on said opposed surfaces.

11. The electronic calculator of claim 10, wherein there is further provided a spacer member between the opposed surfaces of said flexible film, said spacer member having apertures therethrough in the regions of said key contact pairs.

12. An electronic calculator as set forth in claim 10 wherein an insulator rod is secured about the folding region of said printed circuit flexible film.

13. An electronic calculator comprising:

a keyswitch unit for introducing data into said calculator;

a liquid crystal display unit including a liquid crystal material disposed between a pair of glass sheets for displaying said data and calculation results;

said keyswitch unit and said liquid crystal display unit being disposed in overlaying registry with a printed circuit flexible film;

one of said glass sheets of said liquid crystal display having a longitudinal extension from one end thereof beyond the opposed surface of the other glass sheet;

said printed circuit flexible film having a like extension in registry with the longitudinal extension of said one glass sheet;

an LSI semiconductor data processor chip disposed on said longitudinal extension in electrical communication with said keyswitch unit and said liquid crystal display unit;

battery means disposed in a cavity defined by one edge of said keyswitch unit and the respective extended portions of said liquid crystal display and said flexible film; and

terminal means on the respective extended portions of sad display unit and flexible film for providing electrical interconnections between said keyswitch unit, said display unit, and said LSI data processor chip.

14. An electronic calculator as set forth in claim 13 wherein said liquid crystal display is a field effect mode liquid crystal cell with a pair of polarizing filters spaced at a short distance from said cell on opposite sides thereof.

15. An electronic calculator as set forth in claim 14 wherein one of the polarizing filters is secured on a housing for said calculator.

16. An electronic calculator as set forth in claim 14 wherein the spacing between the polarizing filters and the liquid crystal cell is selected longer than the wavelength of light.

17. An electronic calculator comprising:

keyboard means having a plurality of integral key actuators for introducing data into said calculator on which computations are to be performed;

a data processor unit implemented with an LSI semiconductor chip for performing computation functions on the data introduced by said keyboard means;

a multi-digit liquid crystal display means for displaying data introduced by said keyboard means and results of the computation functions performed by said data processor unit, said liquid crystal display means having a portion with electrical terminals thereon which extends from one end of said display means;

a printed circuit flexible film having electrical leaf conductors formed thereon in a predetermined pattern, said electrical leaf conductors having portions which define electrical key contacts for cooperation with said key actuators and terminals for interconnection with said terminals of said liquid crystal display, said key contacts being formed on said printed circuit flexible film by a layer of aluminum with a carbon coating, said layer of aluminum being deposited over the entire area of said flexible film and said carbon coating being selectively deposited on said layer of aluminum in the areas of said key contacts by an etching process; and

means for holding said electrical key contacts of said printed circuit flexible film in juxtaposition to said respective key actuators and said terminals of said film into contact with said terminals of said liquid crystal display.

18. An electronic calculator comprising:

keyboard means having a plurality of integral key actuators for introducing data into said calculator on which computations are to be performed;

a data processor unit implemented with an LSI semiconductor chip for performing computation functions on the data introduced by said keyboard means;

a multi-digit liquid crystal display means for displaying data introduced by said keyboard means and results of the computation functions performed by said data processor unit, said liquid crystal display means having a portion with electrical terminals thereon which extends from one end of said display means;

a printed circuit flexible film having electrical leaf conductors formed thereon in a predetermined pattern, said electrical leaf conductors having portions which define electrical key contacts for cooperation with said key actuators and terminals for interconnection with said terminals of said liquid crystal display, said printed circuit flexible film being folded to form two opposed layers which are sealed together at the periphery of said opposed layers, said flexible film further including air escape holes therein to permit the escape of air from between said two opposed layers; and

means for holding said electrical key contacts of said printed circuit flexible film in juxtaposition to said respective key actuators and said terminals of said film into contact with said terminals of said liquid crystal display.

19. An electronic calculator comprising:

keyboard means having a plurality of integral key actuators for introducing data into said calculator on which computations are to be performed;

a data processor unit implemented with an LSI semiconductor chip for performing computation functions on the data introduced by said keyboard means;

a multi-digit liquid crystal display means for displaying data introduced by said keyboard means and results of the computation functions performed by said data processor unit, said liquid crystal display means having a portion with electrical terminals thereon which extends from one end of said display means;

a printed circuit flexible film having electrical leaf conductors formed thereon in a predetermined pattern, said electrical leaf conductors having portions which define electrical key contacts for cooperation with said key actuators and terminals for interconnection with said terminals of said liquid crystal display; and

means for holding said electrical key contacts of said printed circuit flexible film in juxtaposition to said respective key actuators and said terminals of said film into contact with said terminals of said liquid crystal display, said means for holding including separable cabinets at least one of which has a member extending therefrom for forcing said flexible film toward said longitudinal extension of said glass sheet to compress said terminals of said flexible film against said liquid crystal display terminals.

20. An electronic calculator as set forth in claim 19 wherein said member extending from at least one of said separable cabinets has an elastic member mounted thereon.

21. An electronic calculator comprising:

keyboard means having a plurality of integral key actuators for introducing data into said calculator on which computations are to be performed;

a data processor unit implemented with an LSI semiconductor chip for performing computation functions on the data introduced by said keyboard means;

a multi-digit liquid crystal display means for displaying data introduced by said keyboard means and results of the computation functions performed by said data processor unit, said liquid crystal display means having a portion with electrical terminals thereon which extends from one end of said display means;

a printed circuit flexible film having two substantially orthogonal leg portions and electrical leaf conductors formed thereon in a predetermined pattern, said electrical leaf conductors having portions which define electrical key contacts for cooperation with said key actuators on one of said leg portions and terminals for interconnection with said terminals of said liquid crystal display on the other of said leg portions, said key contacts being formed on two juxtaposed sections on a common surface of said flexible film separated by a portion of said film about which said two sections are folded to bring the respective key contacts on the respective juxtaposed sections into opposed alignment, a plurality of electrical lead wires extending from the contacts of said respective sections to said portions of said leaf conductors which define terminals for interconnection with said terminals of said liquid crystal display; and

means for holding said electrical key contacts of said printed circuit flexible film in juxtaposition to said respective key actuators and said terminals of said film into contact with said terminals of said liquid crystal display.

22. An electronic calculator as set forth in claim 21 wherein said other of said orthogonal leg portions is in registry with said extended portion of said display means.