EP0421517A1 - Alpha-numerical display device - Google Patents

Alpha-numerical display device Download PDF

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Publication number
EP0421517A1
EP0421517A1 EP90202542A EP90202542A EP0421517A1 EP 0421517 A1 EP0421517 A1 EP 0421517A1 EP 90202542 A EP90202542 A EP 90202542A EP 90202542 A EP90202542 A EP 90202542A EP 0421517 A1 EP0421517 A1 EP 0421517A1
Authority
EP
European Patent Office
Prior art keywords
segments
sub
electrode
display device
segment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90202542A
Other languages
German (de)
French (fr)
Other versions
EP0421517B1 (en
Inventor
Jacobus Johannes Van Almen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0421517A1 publication Critical patent/EP0421517A1/en
Application granted granted Critical
Publication of EP0421517B1 publication Critical patent/EP0421517B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/08—Fastening or securing by means not forming part of the material of the label itself
    • G09F3/18—Casings, frames or enclosures for labels

Definitions

  • the invention relates to a display device for displaying alpha-numerical characters, which device comprises an electro-optical material between a first supporting plate having at least one electrode and a second supporting plate having a plurality of electrode segments.
  • a display device of this type is known from United States Patent no. 3,781,864.
  • a liquid crystal display device is shown with a counterelectrode on the one supporting plate and 7 electrode segments for each character on the other supporting plate, and it describes the drive mode for such a display device.
  • Substantially only numerals are shown while using the so-called direct drive method.
  • a segment to be visualized is continuously driven, while the polarity of the drive voltage is periodically changed so as to prevent degradation of the liquid crystal. Therefore, a separate connection is required for each electrode segment.
  • a display device is characterized in that the electrode segments comprise sub-segments most of which are substantially square-shaped, rectangular or parallelogram-shaped and occupy at least a part of character elements arranged in the form of a matrix.
  • the second supporting plate preferably has at least twelve electrode segments and the square-shaped, rectangular or parallelogram-shaped sub-segments occupy the majority of the character elements.
  • Fig. 1 shows diagrammatically the division of the electrode segments 1, 2, 3, ...., 12 on one of the supporting plates of a display device.
  • the device also comprises a second supporting plate having one or more counterelectrodes (at most 4), while an electro-­optical material, for example, a liquid crystalline medium is present between the two supporting plates.
  • an electro-­optical material for example, a liquid crystalline medium is present between the two supporting plates.
  • the boundaries of the different electrode segments 1, 2, 3, ...., 12 are denoted by means of broken lines in Fig. 1.
  • the electrode segments are divided into sub-segments 21, 22, 23, which sub-segments are formed in such a way that they substantially entirely one of the character elements 30 on their own or together with other sub-segments in a matrix of character elements 30, occupy one of the character elements 30, as is shown in Fig. 2.
  • electrode segment 1 comprises three substantially square-shaped sub-segments 21 in this embodiment, which sub-segments correspond to the character elements 30 ab , 30 ac , 30 ad in Fig. 2.
  • Electrode segment 2 comprises four substantially square-­shaped sub-segments 21, which substantially entirely cover the character elements 30 bc , 30 cc , 30 ec and 30 fc , as well as a connection track 15 which connects the sub-segments 21 associated with the character elements 30 cc and 30 ec , and a triangular sub-segment 22 which together with a triangular sub-segment 22 associated with electrode segment 10 substantially entirely covers the character element 30 dc .
  • Electrode segment 3 comprises a triangular sub-segment 22 which together with a triangular sub-segment 22 associated with electrode segment 4 substantially entirely covers the character element 30 ae .
  • electrode segment 3 comprises two pentagonal sub-segments 23 at the location of the character elements 30 bd , 30 cd
  • electrode segment 4 further comprises two substantially square-shaped sub-segments 21 at the location of the character elements 30 be and 30 ce
  • electrode segment 5 comprises three substantially square-shaped sub-segments 21 and a triangular sub-­segment 22 which together with a triangular sub-segment 22 of electrode segment 6 again substantially entirely covers the character element 30 ge
  • electrode segment 6 further comprises two pentagonal sub-segments 23.
  • Electrode segment 7 comprises three substantially square-­shaped sub-segments 21.
  • the electrode segments 8 and 9 can be described similarly as the electrode segments 3 and 4.
  • the electrode segment 10 comprises two substantially square-shaped sub-segments 21.
  • the electrode segments 11 and 12 may be described similarly as the electrode segments 5 and 6.
  • the electrode segments have connection conductors 13 for external connections. If desired, the electrode segment 2 may be connected at two ends, which is shown diagrammatically by means of the dot-and-dash line 14.
  • the electrode segments can be driven directly or with a low multiplex degree (by means of a selection circuit which is not further described), a large viewing angle and a high contrast is obtained when using a liquid crystal display device.
  • a satisfactory display of alpha-numerical characters can be simultaneously obtained by means of the sub-division into sub-segments.
  • a plurality of characters has been shown in Fig. 3 for the purpose of illustration.
  • FIG. 4 Another division with fifteen electrode segments is shown in Fig. 4.
  • the electrode segments 1, 3, 4, 5, 6, 7, 8, 9, 11 and 12 are comparable to those in Fig. 1.
  • the device according to Fig. 4 now has electrode segments 16, 17, 18 each comprising one segment and occupying the character elements 30 db , 30 dc and 30 dd as well as the electrode segments 19 and 20.
  • Each electrode segment 19, 20 comprises two square-shaped sub-segments 21 at the location of the character elements 30 bc , 30 cc and 30 ec , 30 fc , respectively.
  • Fig. 5 shows a plurality of characters displayed by means of a sub-division of (sub-) segments according to Fig. 4.
  • the invention is of course not limited to the examples shown, but many other shapes, notably of the sub-segments 21, are possible, for example, rectangular or parallelogram shapes. Different distributions of the sub-segments over the electrode segments are alternatively possible.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

In an alpha-numerical display the segments are split up into (interconnected) sub-segments in such a way that characters can always be displayed in a manner analogous to that for a matrix display. This provides the advantages of a great freedom of choice of characters with a drive mode (1:n multiplexing, n ≦ 4) yielding a large viewing angle and a high contrast.

Description

  • The invention relates to a display device for displaying alpha-numerical characters, which device comprises an electro-optical material between a first supporting plate having at least one electrode and a second supporting plate having a plurality of electrode segments.
  • A display device of this type is known from United States Patent no. 3,781,864. In this Patent a liquid crystal display device is shown with a counterelectrode on the one supporting plate and 7 electrode segments for each character on the other supporting plate, and it describes the drive mode for such a display device. Substantially only numerals are shown while using the so-called direct drive method. In this drive method a segment to be visualized is continuously driven, while the polarity of the drive voltage is periodically changed so as to prevent degradation of the liquid crystal. Therefore, a separate connection is required for each electrode segment.
  • It has been possible to reduce the number of required connections in such display devices by splitting up the undivided electrode into two or more parts and by ensuring the drive mode by way of multiplex drive (1:2 multiplexing, 1:3 or 1:4 multiplexing). Notably at a higher multiplex degree (5 or more) this leads to a more complicated drive mode as well as to a lower effective drive voltage across the picture segments to be driven. Notably when using liquid crystalline material as an electro-optical medium, such a lower effective voltage leads to a decrease of the viewing angle. The contrast also deteriorates at a multiplex degree of more than 4.
  • Since the shape of the segment electrodes is fixed, the variation of characters to be displayed is also limited in this case.
  • The latter is much less the case if the characters are composed of elements arranged in accordance with a matrix, for example, n rows and m columns defining nxm character elements. As n and m increase, the characters can be fixed more accurately. However, this requires a complicated drive circuit (1 : n multiplexing), while the effective voltage may even further decrease due to the lower duty cycle (1/n) (n is generally high, for example, n ≧ 8).
  • It is one of the objects of the invention to provide a display device of the type described in the opening paragraph in which the advantages of a drive mode using a low multiplex degree (up to 1:4) and a display device based on the matrix principle are combined as much as possible.
  • To this end a display device according to the invention is characterized in that the electrode segments comprise sub-segments most of which are substantially square-shaped, rectangular or parallelogram-shaped and occupy at least a part of character elements arranged in the form of a matrix.
  • The second supporting plate preferably has at least twelve electrode segments and the square-shaped, rectangular or parallelogram-shaped sub-segments occupy the majority of the character elements.
  • The use of a low multiplex degree yields a large viewing angle and a high contrast, while the division into sub-segments gives the device a matrix structure which with a suitable division of the sub-­segments leads to a wide range of characters to be displayed.
  • The invention will now be described in greater detail by way of example with reference to the accompanying drawings in which
    • Fig. 1 shows diagrammatically the division according to the invention of a plurality of electrode segments,
    • Fig. 2 shows a matrix of character elements,
    • Fig. 3 shows the display of a plurality of alpha-­numerical characters by means of a display device according to the invention, while
    • Fig. 4 shows another division of a plurality of electrode segments, and
    • Fig. 5 shows the display of alpha-numerical characters associated with the division of Fig. 4.
  • Fig. 1 shows diagrammatically the division of the electrode segments 1, 2, 3, ...., 12 on one of the supporting plates of a display device. The device also comprises a second supporting plate having one or more counterelectrodes (at most 4), while an electro-­optical material, for example, a liquid crystalline medium is present between the two supporting plates. The boundaries of the different electrode segments 1, 2, 3, ...., 12 are denoted by means of broken lines in Fig. 1.
  • According to the invention the electrode segments are divided into sub-segments 21, 22, 23, which sub-segments are formed in such a way that they substantially entirely one of the character elements 30 on their own or together with other sub-segments in a matrix of character elements 30, occupy one of the character elements 30, as is shown in Fig. 2.
  • For example, electrode segment 1 comprises three substantially square-shaped sub-segments 21 in this embodiment, which sub-segments correspond to the character elements 30ab, 30ac, 30ad in Fig. 2.
  • Electrode segment 2 comprises four substantially square-­shaped sub-segments 21, which substantially entirely cover the character elements 30bc, 30cc, 30ec and 30fc, as well as a connection track 15 which connects the sub-segments 21 associated with the character elements 30cc and 30ec, and a triangular sub-segment 22 which together with a triangular sub-segment 22 associated with electrode segment 10 substantially entirely covers the character element 30dc. Electrode segment 3 comprises a triangular sub-segment 22 which together with a triangular sub-segment 22 associated with electrode segment 4 substantially entirely covers the character element 30ae. Furthermore, the electrode segment 3 comprises two pentagonal sub-segments 23 at the location of the character elements 30bd, 30cd, while electrode segment 4 further comprises two substantially square-shaped sub-segments 21 at the location of the character elements 30be and 30ce. Similarly, electrode segment 5 comprises three substantially square-shaped sub-segments 21 and a triangular sub-­segment 22 which together with a triangular sub-segment 22 of electrode segment 6 again substantially entirely covers the character element 30ge, while electrode segment 6 further comprises two pentagonal sub-segments 23.
  • Electrode segment 7 comprises three substantially square-­shaped sub-segments 21. The electrode segments 8 and 9 can be described similarly as the electrode segments 3 and 4. In addition to the mentioned triangular sub-segment 22, the electrode segment 10 comprises two substantially square-shaped sub-segments 21. The electrode segments 11 and 12 may be described similarly as the electrode segments 5 and 6.
  • In the above-described configuration with twelve electrode segments the substantially square-shaped sub-segments occupy the majority of the character elements 30 (22 out of 35 character elements).
  • The electrode segments have connection conductors 13 for external connections. If desired, the electrode segment 2 may be connected at two ends, which is shown diagrammatically by means of the dot-and-dash line 14.
  • Since the electrode segments can be driven directly or with a low multiplex degree (by means of a selection circuit which is not further described), a large viewing angle and a high contrast is obtained when using a liquid crystal display device. A satisfactory display of alpha-numerical characters can be simultaneously obtained by means of the sub-division into sub-segments. A plurality of characters has been shown in Fig. 3 for the purpose of illustration.
  • Another division with fifteen electrode segments is shown in Fig. 4. The electrode segments 1, 3, 4, 5, 6, 7, 8, 9, 11 and 12 are comparable to those in Fig. 1. Instead of the electrode segments 2, 10, the device according to Fig. 4 now has electrode segments 16, 17, 18 each comprising one segment and occupying the character elements 30db, 30dc and 30dd as well as the electrode segments 19 and 20. Each electrode segment 19, 20 comprises two square-shaped sub-segments 21 at the location of the character elements 30bc, 30cc and 30ec, 30fc, respectively. For the purpose of illustration, Fig. 5 shows a plurality of characters displayed by means of a sub-division of (sub-) segments according to Fig. 4.
  • The invention is of course not limited to the examples shown, but many other shapes, notably of the sub-segments 21, are possible, for example, rectangular or parallelogram shapes. Different distributions of the sub-segments over the electrode segments are alternatively possible.

Claims (5)

1. A display device for displaying alpha-numerical characters, which device comprises an electro-optical material between a first supporting plate having at least one electrode and a second supporting plate having a plurality of electrode segments,
characterized in that the electrode segments comprise sub-segments most of which are substantially square-shaped, rectangular or parallelogram-­shaped and occupy at least a part of character elements arranged in the form of a matrix.
2. A display device as claimed in Claim 1, characterized in that the second supporting plate has at least twelve electrode segments and the substantially square-shaped, rectangular or parallelogram-­shaped sub-segments occupy the majority of the character elements.
3. A display device as claimed in Claim 1 or 2,
characterized in that at least eight electrode segments comprise a plurality of substantially square-shaped, rectangular or parallelogram­shaped sub-segments.
4. A display device as claimed in Claim 3, characterized in that at least one of the eight electrode segments also comprises a triangular sub-segment which together with a triangular sub-segment of another electrode segment substantially entirely occupies a character element.
5. A display device as claimed in any one of the preceding Claims, characterized in that the electro-optical material is a liquid crystalline material.
EP90202542A 1989-09-28 1990-09-25 Alpha-numerical display device Expired - Lifetime EP0421517B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8902412A NL8902412A (en) 1989-09-28 1989-09-28 ALFA-NUMERIC DISPLAY.
NL8902412 1989-09-28

Publications (2)

Publication Number Publication Date
EP0421517A1 true EP0421517A1 (en) 1991-04-10
EP0421517B1 EP0421517B1 (en) 1995-08-23

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ID=19855366

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EP90202542A Expired - Lifetime EP0421517B1 (en) 1989-09-28 1990-09-25 Alpha-numerical display device

Country Status (5)

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EP (1) EP0421517B1 (en)
JP (1) JPH03138686A (en)
KR (1) KR910006898A (en)
DE (1) DE69021817T2 (en)
NL (1) NL8902412A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588329A2 (en) * 1992-09-18 1994-03-23 Pioneer Electronic Corporation Display with a plurality of pixels for displaying characters
EP2887161A1 (en) * 2013-12-23 2015-06-24 ETA SA Manufacture Horlogère Suisse Electrode arrangement for a digital display

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146285A2 (en) * 1983-12-16 1985-06-26 Vultron International Limited Electro optic flat panel display
DE3346630A1 (en) * 1983-12-23 1985-07-04 SWF Auto-Electric GmbH, 7120 Bietigheim-Bissingen Display device, in particular for motor vehicles
EP0164152A2 (en) * 1984-05-08 1985-12-11 Koninklijke Philips Electronics N.V. Electro-optical display device
EP0180685A1 (en) * 1984-09-11 1986-05-14 Ascom Autophon Ag Alphanumeric indicating arrangement with segments each controllable into a visible and an invisible state
EP0255158A2 (en) * 1986-07-07 1988-02-03 Koninklijke Philips Electronics N.V. Data display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146285A2 (en) * 1983-12-16 1985-06-26 Vultron International Limited Electro optic flat panel display
DE3346630A1 (en) * 1983-12-23 1985-07-04 SWF Auto-Electric GmbH, 7120 Bietigheim-Bissingen Display device, in particular for motor vehicles
EP0164152A2 (en) * 1984-05-08 1985-12-11 Koninklijke Philips Electronics N.V. Electro-optical display device
EP0180685A1 (en) * 1984-09-11 1986-05-14 Ascom Autophon Ag Alphanumeric indicating arrangement with segments each controllable into a visible and an invisible state
EP0255158A2 (en) * 1986-07-07 1988-02-03 Koninklijke Philips Electronics N.V. Data display device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588329A2 (en) * 1992-09-18 1994-03-23 Pioneer Electronic Corporation Display with a plurality of pixels for displaying characters
EP0588329A3 (en) * 1992-09-18 1994-09-07 Pioneer Electronic Corp Display with a plurality of pixels for displaying characters
US5475516A (en) * 1992-09-18 1995-12-12 Pioneer Electronic Corp. Alphanumeric symbol formed by a 3×5 matrix with two longitudinally bisected pixels
EP2887161A1 (en) * 2013-12-23 2015-06-24 ETA SA Manufacture Horlogère Suisse Electrode arrangement for a digital display
KR20150073843A (en) * 2013-12-23 2015-07-01 에타 쏘시에떼 아노님 마누팍투레 홀로게레 스위세 Arrangement of electrodes for a digital display
KR101648639B1 (en) 2013-12-23 2016-08-16 에타 쏘시에떼 아노님 마누팍투레 홀로게레 스위세 Arrangement of electrodes for a digital display
US9897977B2 (en) 2013-12-23 2018-02-20 Eta Sa Manufacture Horlogère Suisse Arrangement of electrodes for a digital display

Also Published As

Publication number Publication date
DE69021817T2 (en) 1996-04-04
EP0421517B1 (en) 1995-08-23
KR910006898A (en) 1991-04-30
DE69021817D1 (en) 1995-09-28
NL8902412A (en) 1991-04-16
JPH03138686A (en) 1991-06-13

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