CA1097419A

CA1097419A - Calculator apparatus with electronically alterable key symbols

Info

Publication number: CA1097419A
Application number: CA284,084A
Authority: CA
Inventors: Alan S. Bagley
Original assignee: Hewlett Packard Co
Current assignee: HP Inc
Priority date: 1976-08-23
Filing date: 1977-08-04
Publication date: 1981-03-10
Also published as: DE2737697B2; DE2737697C3; HK34883A; GB1589099A; JPS5326548A; DE2737697A1; US4078257A

Abstract

Abstract of the Disclosure A calculator system having a transparent keyboard includes an apparatus for electronically labeling the keyboard by displaying alphanumeric symbols through the keyboard. The apparatus comprises a keyboard selection device and a liquid crystal keyboard display device having a predetermined number of display planes each containing preselected symbols. The keyboard selection device operates both as a selection device and as an annunciator-feedback device, for selecting the symbols or legends of a given plane to label or configure the keyboard, and for feeding back to a user of the system the status of the selection device when it is activated. An alternative embodiment of the invention utilizes light-emitting diodes (LED's) for labeling the keyboard.

Description

7~

Background of the Invention The present invention relates generally to keyboard apparatus and more particularly to calculator keyboard apparatus. The number of different functions performed by a calculator is limited by the number of keyboard con-figurations available to the user. Each configuration represents a combination of different keys of the keyboard.
A key may be used for as many different functions as there are labels or physical marks upon it or near it identifying the key. It is often difficult, however, to establish more than three such marks on or near a key to identify it for multiple use. To significantly increase the number of functions that may be performed by a key, therefore, it is desirable to be able to mark or identify the key with many labels.
Summary of the I~vention In accordance with one aspect of this invention there is provided in a data entry system having a keyboard with at least one labeled key and a plurality of unlabeled ~0 keys, an apparatus comprising:
display means having display elements energizeable for displaying different configurations of symbols; and selection means coupled to the display means and actuatable for selecting between a keyboard selection mode and a data entry mode of operation andfor selecting at least one configuration of symbols during the keyboard selection mode;
the display means being responsive to the selection means for electronically labeling selected ones of the unlabeled keys in accordance with the selected configuration during the keyboard selection mode by energizing selected ones B

:10974~
of the display elements to define the symbols of the selected configuration and displaying individual ones of the defined symbols at the selected ones of the unlabeled keys;
the electronically labeled keys and the labeled keys being actuatable during the data entry mode for entering data corresponding to their labels.
In accordance with another aspect of this invention there is provided a method of electronically labeling a keyboard with at least one configuration of alphanumeric symbols, the symbols being displayable from at least one plane of energizeable elements, the keyboard having at least one labeled key and a plurality of transparent unlabeled keys, one of said labeled keys being disposed for selecting one of first and second modes of operation, said method com-prising the steps of:
selecting a first mode of operation;
selecting a keyboard configuration of alphanumericsymbols during said first mode; and displaying the selected configuration of alpha- `
numeric symbols through the transparent unlabeled keys during said first mode to electronically label the unlabeled keys, by energizing selected portions of selected ones of the energizeable elements in accordance with the keyboard configuration selected, the electronically labeled keys and selected ones of the labeled keys being actuable during said second mode for entering information indicated ~`
by their labels.
In accordance with another aspect of this invention there is provided a keyboard having at least one configuration of alphanumeric symbols disposed as energizeable elements on at least one plane, said keyboard being responsive to means - la -~1~1974~9 for selecting at least two modes of operation, means for selecting a keyboard configuration by energizing selected ones of the elements, and means for displaying the selected configuration, said keyboard comprising:
a cover portion with at least one labeled key and a plurality of transparent unlabeled keys, the labeled key being disposed for initiating the selection of one of the two modes of operation and for initiating the selection of a configuration of alphanumeric symbols during a first mode, to electronically label the unlabeled keys;
a conductive portion disposed helow said cover portion and having a first transparent portion located below said transparent unlabeled keys; and a display portion disposed below said conductive portion and having a second transparent portion located below said first transparent portion, said second trans-parent portion havin~ at least one substantially trans-parent plane with the plurality of energizeable elements for producing and displaying through said transparent keys and portions at least one configuration of alphanumeric symbols to electronically label, during said first mode, the unlabeled keys in accordance with the selected con-figuration, the electronically labeled keys and the labeled keys being actuatable during a second mode for making : 25 keyboard entries indicated by their labels.

.~' . , , - lb -" j, , ~g74~9 Thus, in accordance with the illustrated prererred embodiment of the present invention, a calculator appaxatus is disclosed having a keyboard with a transparent portion, keyboard-selection keys comprising a keyboard function key and numeric keys that provide feedback of an activated state when activated, and a keyboard display having a plurality of keyboard configurations of alphanumeric sym~ols.
In selecting a keyboard configuration, a user s~r_C 'hc selection process by activating the keyboard function ~ey, after which he activates, for example, two numeric keys to specify the number of the desired configuration. The calculator selects a configuration by matching the configuration number with a con-figuration of the alphanumeric sym~ols, and labels the keyboard by displaying t~e selected configuration, having only the symbols of that configuration visible when viewed through the transparent portion of the keyboard. The inv~ntion thus provides a way of electronically labeling and relabeling a limited set of keys to access a large number of functions that may be programmed into the calculator.
Description of the Drawings ; Figure 1 is a front view of a conventional electronic ~ ;`^
calculator.
Figure 2 is a block diagram of the calculator of Figure 1.
Figure 3 is a front view of a keyboard with a transparent-Xey portion employed in the calculator of Figure 1 in accordance with the preferred embodiment of this invention.
Figu~~es 4(A) and (B) are cutaway si~e views of a Xey of the Xeyboard of Figure 3 showing the key in a non-activated state and in an activated state, respectively.
Figure 5 is an isometric view of transparent layers of ~1974~9 the keyboard of ~igure 3 having transparent conductive parts and liquid crystal alphanumeric symbols.
Figure 6 is a block diagram of a circuit of the calcu-lator of Figure 3 for decoding keyboard entries~
Figure 7 is a logic flow diagram of a keyboard selection and labeling routine stored in a ~DM of the calculator of Figure 3.
Figure 8 is a top view of a layer of the keyboard of Figure 5 showing a circuit with substantially transparent electrodes for applying an electric field in areas containing the liquid crystal s~ols.
Figure ~(~) is a top view of liquid crystals arranged in X-Y
matrix format for forming and displaying symbols when an electric current is applied to selected segments of the matrix.
Figure 9(B) ~ a top view of liquid crystals or light-emitting diodes (LED's) arranged in dot matrix format ~or forming and displaying symbols when an electric current is applied to selected segments of the matrix.
Description of the Preferred Embodiment _, Re~erring to Figure 1, there is represented a conventional electronic ~alculator 11 having an on-off switch 12, a keyboard 13 for entering instructions and data into the calculator 11, and an output display unit 21. As shown in Figure 2, calculator 11 also includes a control and timing circuit 15, an arithmetic and regis- ;
ter circuit 17, at least one read-only memory (ROM) 19, and a ; 25 power supply 23. Except for the construction of the keyboard 13 and a keyboard-labeling program stored in ROM 19, the calculator - and the aforementioned elements thereof may be constructed and operated in the same manner shown and described in detail in U.S.
Patent No. 3,863,060 entitled, "General Purpose Calculator With Capability For Performing Interdisciplinary Business Calculations~, issued January 28, 1975 to France Rode, et al., and incorporated by reference herein (~ee, for example, Figures 2 and 5, and the associated descriptions thereof in the referenced patent~.

974~9 Referring now to Figure 3, there is shown a key-stud-ded keyboard 13 employed in the calculator 11 of Figure 1 in accordance with the preferred embodiment of this invention. ;~
Keyboard 13 comprises an opaque portion 25 and a transparent-key portion 27. The opaque portion 25 which includes an on-off key 12 and numeric keys labeled 0-9 may be molded from any opaque plastic material such as Acrylonitrile Butadiene Styrene (ABS) material. The transparent-key portion 27 is molded as indicated in Figures 3 and 4(A) having an opaque portion 29 with a matrix of apertures or windows 31 and a layer of transparent plastic material 33 that fills the aper tures 31 to form transparent keys or domes 35.
Located beneath layers 29 and 33 are transparent plastic layers 37 and 41, and opaque plastic insulator layer 15 39. Layer 39 separates and insulates layer 37 from layer 41.
Layer 37 is flexible and "gives" when pressed; layer 41 is rigid and does not "give" when pressed. As shown in Figure 5, insulator layer 39 comprises a matrix of uniformly- ~;
spaced windows 49 and layers 37 and 41 comprise uniformly-20 spaced transparent conductive strips 51 and 53. Strips 51 and 53 may be thin films of metal or metal oxide with low electrical resistance, vacuum deposited on or embedded in layers 37 and 41 with sufficient thinness as to appear transparent. Strips 51 of layer 37 are othoyonally disposed 25 with respect to the strips 53 of layer 41; strips 51 run column-wise while strips 53 run row-wise. Figures 4(B) and 5 show that when a key 35 is pressed, it pushes down a portion of flexible layer 37 through a window 49 of insula-tor layer 39. This causes a column strip 51 of layer 37 to make contact with and intersect a row strip 53 of layer 41, thereby permitting current flow along the intersecting strips 51 and 53.

' 3lO~74~9 As shown in Figure 6, when a user activates a key, the control and timing circuit 15 scans the matrix of keys of the keyboard 13, row by row, in search of the activated key.
In the scannin~ operation, the contents or count of a 3-bit counter 42 of circuit 15 is applied to a row decoder 48 of the same circuit for indicating or specifying the rows to be scan-ned. As the counter 42 is incremented, the row decoder 48 con-secutively selects a next row to be scanned, and scans that row by applying a signal to a conductive strip 53 constitut-ing that row. This is done until all rows are selected,following which the count of 42 is restarted and the selection process is repeated. When a key is activated causing the intersection of a column strip 51 with a selected row strip 53, therefore, this results in the switching of the applied ~ 15 signal from a row strip 53 along an intersecting column strip ; 51 to column encoder 52 of circuit 15. The column encoder 52 encodes the applied signal into three bits identifying the column containing the activate~ key. These three bits and three bits of counter 42 together define the key code or location (column and row coordinated, respectively) o~ the '~( activated key. The contents of counter 42 and of encoder 52 are then saved in key code buffer 5~ of circuit 15. The contents of this buffer 56 are transferred to a ROM address register 58 of circuit 15 and become the starting address of a keyboard selection xoutine stored in ROM 19. A flow chart of this routine is shown in Figure 7.
- In utili~ing this routine to select a keyboard config-uration, the user first depresses or activates a keyboard selection (KBDI key 55, as shown in Figure 3, to place the calculator in keyboard selection mode, after which he acti~
vates one or more of the numeric keys to specify the particu-lar keyboard configuration desired. According to the preferred embodiment of the present invention, the lCD974~9 user enters a two-digit number to specify up to one hundred ~00-99) different keyboard configurations. Thus, as indicated in ~igures 6 and 7, when XBD key 55 (Figure 3) is activated, the Xey code of this key is saved in buffer 56 and becomes the starting address of ~he keyboard selection routine. ~s indicated in block 57 of the flow chart of this routine, a test is first made by arithme-tic and register circuit 17 (Figure 2) to determine if the key code is that of KBD key 55. If not, control is transferred to block 65.
If the key code is a KBD key code indicating that the KBD
key 55 has been activated, an intexnal flag is set as shown by block 59 placing the calculator in a "keyboard-selection mode"
and enabling a user to enter the nw~er of the keyboard config-uration he selects. A counter (K) is then set to 1 as indicatad by block 61, after which exit is made from the routine. Following the activating of the KBD key 55, the user then enters a first numeric digit by activating one of the numeric keys marked 0-9.
This causes the keyboard selection routine to be re-executed, with control beLng trans~erred from block 57 to block 63 of the routine. Thereafter, because the KBD mode flag was previously set at block 59 and because the variable K was previously set to 1 at block 61, control is transferred from block 63 to block 65 and then to block 67. At block 67 the key code is converted to a decimal dlgit tD) corresponding to the mark or physical label of the key. ~his c~nversion may be performed, for example, by "table look-up", utilizing Table 1 shown below.

- ~0974~9 T~BLE 1 _ _ _ Key Label Key Code Decimal Digit ¦ Row Column (D) S

10 ~ I ~

`''` 15 - -Blocks 69 and 71 show that aiter the key code is converted to a first decimal digit, the digit is stored as a lO's digit num-~;- ber (e.g., 1 is stored as 10) in a temporary location tl~P~ of ROM 19, after which the counter K is incremented to 2 and an exit is made from the routine. The ~outine is re-executed when the user enters a second decimal digit by activating a second numeric key. This causes control to be transferred from block 57 to block 63 of the routine. Thereafter, control is transferred to block 75 ` via blocks 63, 65 ànd 73. Control is transferred from block 63 to block 65 becausè the KBD mode flag that was previously sPt at block 59 is still set. Control is transferred from block 65 to block 73 and then to block 75 because the value of counter K is

- 2, having been set to that value previously at block 71.
At block 75 the key code of the second activated numeric key is converted to a decimal digit (D) and this decimal digit ` ~)974~1l9 is added, at block 77, to the number stored in location TEMP of ROM 19 to produce a two-digit decimal number ~. For example, if, after activating the KBD key 55 (Figure 3) the user activates numeric key "1" 85 ~Figure 3) and then numeric key "3" 87 (Figure 53), ~he number N formed at block 77 would be 13. This is accom-plished as follows. Activation of numeric key "1" causes the key code 2-1 shown in Table 1 to be converted by the keyboard selection ~-~
routine to the value 10. There~fter, activation of numeric key "3"
causes a key code 2-3 to be converted to the value 3 and added to r 10the yalue 10, thereby producing the value 13.
After the number ~ is calculated, the operation represented by block 79 is performed, causing a signal to be applied to the Nth plane o the liquid crystal planes (Figure 5), and to the individual liquid crystal symbols 91 (Figure 5) em~edded in that 15plane, thereby labeling each transparent key 35 above the symbols.
Subsequently, as blocks 81 and 83 show, the KBD mode flag and counter K are reset to permit regular use (i.e., non-labeling) of the keyboard until such time as the KBD key is again activated.
~- After the operation at block 83 is performed, exit is made from the routine~ Thereafter, whenever the user activates one of the labeled keys, the calculator transfers control to a "function routine" for performing the particular function or operation indicated by the label of the activated key. In transferring control to the function routine, the calculator first determines ~5the ROM address of the function routine and then transfers control to that address. In determining the ROM address, the calculator utilizes bo~h ~ and key code values, the key codes identifying the coordinates of the activated key and ~ identifying the plane containing the label of the activated key.
Blocks 78, 80 and 82 show that whenever the ~ee~ of a dif--- 8 ~

4~9 ferent keyboard configuration logically follows the use of a prior configuration, the calculator automatically seiects the subsequent configuration after the operations associated with the prior con-figuration are compl~ted. For example, if the operations associ-ated with the sixth Xeyboard configuration are completed and theoperations associated with the ninth Xeyboard configuration must logically be performed next, the calculator assigns the new value o~ nine to ~ and, as block 79 shows, displays the next keyboard configuration ~y applying an appropriate signal to plane nine.
In the illustrated embodiment of Figure ~, electric field zones 93 are shown within which are enclosed hollow areas filled with liquid crystal material such as cholesteric liquid crystals in the shape of different alphanumeric symbols 91. Electric field zones 93 are used to produce an opaque or otherwise dis-cernable image of the li~uid crystal material 91 when the mate-rial is viewed through transparent keys 35. Such a use of an electric field zone 93 is well documented in the literature (see, for example, Figure 2~d)~nd accompanying description of U~5. Patent 3,718,380, issued February 27, 1973 to J.J. Wysocki, et al.). In the referencedpatent, an electric field,which is created by the application of an electrical signal from a signal source alon~ txansnarent electrodes, is employed to produce an opaque image ~f-a symbol whenlightfrom alight source is transmitted through the liquid crystal material and through orthogonally-oriented polarizers.
An alternative construction, as depicted in Figure 2(b) or2(c) of the above-referenced patent, utilizes reflected ambient light and obviates the need for polarizers and for a light source.
Such an alternative construction is also employable in appliCant's invention, provided both electrodes 97 (Figure 5) are transparent and provided polarizers 101, 103 and light source 99 are omitted.

_ g _ ~ 1~979~9 Another embodiment of the present invention employs a single plane 89 of transparent plastic material having a plurality of electric field zones 93, each zone 93 comprising a matrix of individual segments of liquid crystals that can be individually addressed and displayed, such as the X-Y segments 105 shown in Figure 9(A) or dot segments 107 shown in Figure 9(B)- The dot segments 107 shown in Figure 9(B) may also he light-emitting diode (LED) elements geometrically arranged in matrix format. 5uch individually addressable matrix segments are described in the literature (see, for example, Edward L.Williams, Liquid Cr~stals For Electronic Devices, Noyes Data Corpora-tion, Park Ridge, New Jersey, 1975, page 79). To effable such matrix segments 105, 107 as shown in Figures 9(A) and 9(B) to be utilized in the keyboard of the present invention, the routine shown in Figure 7 may be changed so as not to select an Nth plane for display but to select an Nth series of ROM locations. Selection is made from several series of ~OM iocations, the contents of eàch series corresponding to the X-Y or dot matrix patterns of the symbols of one keyboard configuration. Symbol patterns are pre-determined and prestored in ROM 19.
Other embodiments of the present invention include a keyboard 13 having both sections 25 and 27 (Figure 3) transparent, or a keyboard with transparent keys that become actuated by induction, for example, a keyboard that enables transparent conductive strip 53 (Figure 5) of plane 41 to induce a current in transparent strip 51 of plane 37 when strip 51 is brought into close proximity to strip 53, or a keyboard with transparent keys that become actuated by virtue of the capacitanc.e, heat or other physical phenomenon between transparent strip 53 and a proximate transparent strip Sl or a proximate human ~inger.

-- 10 -- .

~9 ~ .9 A further embodiment of the present invention employs the keyboard-selection (I~BD) key 55 as the sole keyboard selection device. Successive keyboard configurations are displayed when the key is successively activated, or when the key is depressed and held down.
When activated, the keys 35 provlde a feedback to the user. This feedback may be in the form of a tactile sensation such as, ~or example, a vibration, a light electrical shock, or a mechanical or "flexible snap-back" action as from the key o Figure 4(B), or may be in the form of an audible, visual or other sensation.

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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. In a data entry system having a keyboard with at least one labeled key and a plurality of unlabeled keys, an apparatus comprising:
display means having display elements energizeable for displaying different configurations of symbols; and selection means coupled to the display means and actuatable for selecting between a keyboard selection mode and a data entry mode of operation and for selecting at least one configuration of symbols during the keyboard selection mode;
the display means being responsive to the selection means for electronically labeling selected ones of the unlabeled keys in accordance with the selected configuration during the keyboard selection mode by energizing selected ones of the display elements to define the symbols of the selected configuration and displaying individual ones of the defined symbols at the selected ones of the unlabeled keys;
the electronically labeled keys and the labeled keys being actuatable during the data entry mode for entering data corresponding to their labels.

2. The system as in claim 1 wherein at least one of the labeled keys are actuatable for initiating the selection of a particular configuration of symbols when the system is in the keyboard selection mode.

3. The apparatus of claim 1 wherein the selection means includes a single keyboard selection key disposed for selecting any of a plurality of keyboard configurations in response to actuation of said single key.

4. The apparatus of claim 1 wherein said keys are disposed for indicating on activated state when activated by a user.

5. The apparatus of claim 1 wherein the unlabeled keys are transparent and the display means includes a flexible transparent layer having a first set of substan-tially transparent conductive strips, a substantially non-flexible transparent layer having a second set of substantially transparent conductive strips orthogonally disposed with respect to said first set, and an insulator layer separating said flexible and non-flexible layers with windows disposed therein for enabling said first set of conductive strips to make contact with said second set of conductive strips through said windows when the transparent unlabeled keys are activated.

6. The apparatus of claim 1 wherein the unlabeled keys are transparent and the selection means includes a processor unit and a read-only memory unit having a keyboard selection routine stored therein for performing the keyboard selection operation indicated by the routine in response to actuation of the selection means.

7. The apparatus as in claim 6 wherein said read-only memory unit includes a routine stored therein for automatically displaying, in the absence of activation of the keyboard selection key, a preselected keyboard configuration whenever the operations corresponding to said preselected keyboard configuration must logically be performed following the completion of a current operation.

8. The apparatus of claim 6 wherein said energizeable elements are a plurality of liquid crystals from which alphanumeric symbols are selected for display by the processor unit under control of said routine, said symbols being viewable through the transparent unlabeled keys.

9. The apparatus of claim 6 wherein said energizeable elements are a plurality of substantially transparent matrices of light-emitting diodes, which, when selectively activated by the processor under control of said routine, form symbols that are viewable through the transparent unlabeled keys.

10. A method of electronically labeling a keyboard with at least one configuration of alphanumeric symbols, the symbols being displayable from at least one plane of energizeable elements, the keyboard having at least one labeled key and a plurality of transparent unlabeled keys, one of said labeled keys being disposed for selecting one of first and second modes of operation, said method com-prising the steps of:
selecting a first mode of operation;
selecting a keyboard configuration of alphanumeric symbols during said first mode; and displaying the selected configuration of alpha-numeric symbols through the transparent unlabeled keys during said first mode to electronically label the unlabeled keys, by energizing selected portions of selected ones of the energizeable elements in accordance with the keyboard con-figuration selected, the electronically labeled keys and selected ones of the labeled keys being actuable during said second mode for entering information indicated by their labels.

11. The method of claim 10, where the step of selecting a keyboard configuration includes the steps of:
activating at least one labeled key;
identifying the activated key; and selecting at least a first configuration of alpha-numeric symbols in accordance with the identified activated key.

12. The method of claim 11, where the step of selecting at least a first configuration includes the steps of determining any subsequent configuration which logically follows said first configuration and which is logically displayable following said first configuration, and auto-matically selecting said subsequent configuration for display.

13. The method of claim 10 where the steps of selecting a configuration and displaying the selected configuration are performed in response to individual actuations of a labeled key.

14. The method of claim 10 where the steps of selecting a configuration and displaying the selected configuration occur successively, producing different keyboard configura-tions during the interval that a labeled key is activated and held down in a depressed position.

15. A keyboard having at least one configuration of alphanumeric symbols disposed as energizeable elements on at least one plane, said keyboard being responsive to means for selecting at least two modes of operation, means for selecting a keyboard configuration by energizing selected ones of the elements, and means for displaying the selected configuration, said keyboard comprising:
a cover portion with at least one labeled key and a plurality of transparent unlabeled keys, the labeled key being disposed for initiating the selection of one of the two modes of operation and for initiating the selection of a configuration of alphanumeric symbols during a first mode, to electronically label the unlabeled keys;

a conductive portion disposed below said cover portion and having a first transparent portion located below said transparent unlabeled keys; and a display portion disposed below said conductive portion and having a second transparent portion located below said first transparent portion, said second trans-parent portion having at least one substantially trans-parent plane with the plurality of energizeable elements for producing and displaying through said transparent keys and portions at least one configuration of alphanumeric symbols to electronically label, during said first mode, the unlabeled keys in accordance with the selected con-figuration, the electronically labeled keys and the labeled keys being actuatable during a second mode for making keyboard entries indicated by their labels.

16. The keyboard as in claim 15 wherein said labeled key and unlabeled keys are disposed for indicating an activated state when activated by a user.

17. The keyboard as in claim 16 wherein said conductive portion includes a flexible transparent layer having a first set of substantially transparent conductive strips, a sub-stantially non-flexible transparent layer having a second set of substantially transparent conductive strips ortho-gonally disposed with respect to said first set, and an insulator layer separating said flexible and non-flexible layers with windows disposed therein for enabling said first set of conductive strips to make contact with said second set of conductive strips through said windows when the unlabeled keys are activated.

18. The keyboard as in claim 15 wherein the energize-able elements are liquid crystal elements.

19. The keyboard as in claim 15 wherein the energize-able elements are substantially transparent matrices of light-emitting diodes.