GB2214342A - Liquid crystal display apparatus - Google Patents

Liquid crystal display apparatus Download PDF

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Publication number
GB2214342A
GB2214342A GB8901175A GB8901175A GB2214342A GB 2214342 A GB2214342 A GB 2214342A GB 8901175 A GB8901175 A GB 8901175A GB 8901175 A GB8901175 A GB 8901175A GB 2214342 A GB2214342 A GB 2214342A
Authority
GB
United Kingdom
Prior art keywords
liquid crystal
crystal display
drive
drive circuit
electrode pattern
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.)
Withdrawn
Application number
GB8901175A
Other versions
GB8901175D0 (en
Inventor
Yasukaza Kawamura
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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
Priority claimed from JP864888A external-priority patent/JPH01185526A/en
Priority claimed from JP864788A external-priority patent/JPH01185525A/en
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of GB8901175D0 publication Critical patent/GB8901175D0/en
Publication of GB2214342A publication Critical patent/GB2214342A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134336—Matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0232—Special driving of display border areas

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Theoretical Computer Science (AREA)
  • Geometry (AREA)
  • Computer Hardware Design (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Description

LIQUID CRYSTAL DISPLAY APPARATUS 2214342 The present invention relates to
a dot matrix type liquid crystal display apparatus to be used as a display for such business machines as computers, word processors and the like.
Fig. 1 is a front view of a liquid crystal display panel according to a prior art,
Fig. 2 illustrates dispositions of electrodes for the display panel, Fig. 3 is a sectional view of the panel shown in Fig. 1, and Fig. 4 is an enlarged view-of the portion A shown in Fi g. 3.
In these drawings, numeral 1 designates a liquid crystal display panel, numeral 2 an upper substrate made of glass disposed on the upper surface of the panel, numeral 3 a lower substrate made of glass disposed on the lower surface of the panel, numeral 4 a.liquid crystal provided between the opposing glass substrates, numeral 5 scanning electrodes disposed transversely on the lower glass substrate on the side facing the liquid crystal 4, numeral 6 signal electrodes disposed longitudinally on the upper glass substrate 2 on the side facing the liquid crystal 4, numeral 7 picture elements formed at the points where electrodes 5 and 6 cross each other and numeral 8 an effective display range defined by the display picture elements. Numeral 9 disignates a drive circuit for the scanning electrodes while -2numeral 10 designates a drive circuit for the signal electrodes, both of which are mounted on a substrate 11 on which the drive circuits are mounted. Numeral 12 designates a cable connecting the liquid crystal panel 1 to the drive circuit substrate 11 and numeral 13 designates a sealing material.
In the liquid crystal display apparatus according to prior art, the signal electrodes 6 and the scanning electrodes 5 are constituted in a matrix configuration by means of transparent electrode membranes respectively provided on the upper glass substrate 2 and the lower glass substrate 3 of the liquid crystal display panel 1. The points where the scanning electrodes 5 and the signal electrodes 6 cross define the picture elements 7.
In the constitution explained above, when scanning signals are transmitted from the drive circuit 9 for the scanning electrode to the scanning electrodes 5 and the signals are sent to the signal electrodes 6 from the drive circuit 10 for the signal electrodes, the liquid crystal 4 corresponding to the picture elements 7, at the crossing of the electrodes 5 and 6 to which the signals have been transmitted is operative for display. The area where these picture elements 7 are concentrated can provide an effective display range 8. When the liquid crystal panel 1 is operative for display, the color hue of the background beyond the effective display range is different from that of the background in the effective display range 8.
Since the liquid crystal display apparatus according to prior art has the above-explained constituted, when characters and pictures are composed by using picture elements 7 at the extreme end of the effective display range 8, the color hue of the background of the effective display range 8 is different from that of the background around the effective display range 14 and the quality will therefore be poor. It is particularly noticeable that when the color of the background around the effective display range 14 is the same as the color of the display of characters and pictures, it will be difficult to distinguish the characters and 10 pictures from the background.
The aim of the present invention is to reduce the problems mentioned above.
According to the present invention there is provided a liquid crystal display apparatus having a liquid crystal display panel with an effective display range and wherein, when the display panel is operative for display, the background around said effective display range has substantially the same color as the background within the effective display range.
The present invention can thus provide a liquid crystal display apparatus adapted to display characters and pictures wherein electrode patterns are provided outside the effective display range of a liquid crystal display panel in such a manner as to surround the effective display range, and a drive circuit for the electrode patterns is provided to drive the electrode patterns so that the color of the background around the effective display range may become the same as that of the background in the effective display range.
In other words, the present invention allows the provision of a liquid crystal display apparatus wherein electrode patterns are provided around the effective display range of a liquid crystal display panel in such a manner as to surround the effective display range and a drive circuit exclusively provided for such electrode patterns is disposed separately from the drive circuits provided for the scanning electrodes and the signal electrodes.
The present invention can also provide a liquid crystal display apparatus adapted to display characters and pictures wherein electrode patterns corresponding to the scanning electrodes and the signal electrodes are provided around the effective display range of a liquid crystal display panel and a drive circuit for the scanning electrodes and a drive circuit for the signal electrodes are provided to drive the electrode patterns, so that the colour of the background around the effective display range is the same as that of the background in the effective display range when the liquid crystal display panel is operative for display.
The present invention can also provide a liquid crystal display apparatus wherein electrode patterns equivalent to the scanning electrodes and the signal electrodes are provided outside the effective display range of the liquid crystal display panel, so that the same voltage as that which is applied when the liquid crystal display panel is operative for display and the picture elements are not displayed on the electrodes can be applied from the drive circuits for the scanning electrodes and the signal electrodes.
Preferably according to the present invention, the color of the background of the entire surface of the liquid crystal display panel can be the same and thus an excellent display quality can be obtained even if the characters and picture images are constituted by utilizing the picture elemen ts at the extreme outer portion in the effective display range.
Preferably in the liquid crystal display apparatus according to the present invention, electrode patterns that are able to surround the effective display range and the drive circuit provided exclusively for the electrode patterns are provided around the effective display range of the liquid crystal panel and, when the liquid crystal display panel is operative for display, a voltage that will not cause the picture elements to display is applied to the electrode patterns from the exclusive drive circuit so that the color of the background both within and around the effective display range can be made the same, and even if the display picture elements at the extreme outer portion of the effective display range are used to constitute characters and pictures, characters and pictures having an excellent display quality can be obtained.
According to the present invention, since the electrode patterns can be provided around the effective display range of a liquid crystal display panel and a voltage signal can be applied from the exclusive drive circuit to the electrode patterns, a liquid crystal display apparatus can be provided at a reasonable cost that is capable of offering excellent display quality by virtue of the color of the background around the effective display range of a liquid crystal display panel being the same as that of the background within the effective display range.
According to the inventive liquid crystal display apparatus, electrode patterns corresponding to the scanning electrodes and the signal electrodes can be provided around the effective display range of the liquid crystal panel, so that when the liquid crystal display panel is operative for display, a voltage which is similar to that which is applied to the electrode patterns within the effective display range can also be applied to the electrode patterns outside the effective-range from the drive circuits for the scanning electrodes and the signal electrodes, thus generating the same color background not only within but also outside the effective display range. Consequently, even if the characters-and pictures are constituted by utilizing picture elements at the extreme outer portion of the effective display range, such characters and pictures will possess an excellent display quality.
The drawings and the following description are exeTrplary only.
Fig. 1 is front view of the liquid crystal display panel of a liquid crystal display apparatus according to a prior art;
Fig. 2 illustrates the disposition of the electrodes in the liquid crystal display panel shown in Fig. 1; Fig. 3 is a sectional view of the liquid crystal display panel shown in Fig. 1; Fig. 4 is an enlarged view of the portion designated by A in Fig. 3; Fig. 5 is a front view of the liquid crystal display panel of the liquid crystal display apparatus according to the present invention; Fig. 6 illustrates the disposition of the electrodes in a liquid crystal display panel according to the fir-st embodiment of the present invention; Fig. 7 is a sectional view of the liquid crystal display panel shown in Fig. 6; Fig. 8 is an enlarged view of the portion designated by B in Fig. 7; Fig. 9 illustrates in detail the drive circuit for the signal electrodes and the drive circuit for the scanning electrodes shown in Fig. 6, both of the drive circuits being connected to the liquid crystal display panel; Fig. 10 illustrates one of the drive LSI's 1 through 8 in the drive circuit for signal electrodes shown in Fig. 9, such as the drive LSI 1 which is adapted to generate drive signals 4), - 4)80; Fig. 11A through Fig. 11C illustrate signal wave forms to assist in explaining the operation of the drive circuit for the signal electrodes shown in Fig. 10; Fig. 12 illustrates one of the drives LSI 9 through LSI 11 in the drive circuit 10 for scanning electrodes shown in Fig. 9, for example, the drive LSI 9 adapted to generate drive signals l - 8o; Fig. 13A and Fig. 13B illustrate signal wave forms for the purpose of explaining the operation of the drive circuit for scanning electrodes shown in Fig. 12; Fig. 14 illustrates the disposition of the electrodes in a liquid crystal display panel according to the second embodiment of the present invention; Fig. 15 is a sectional view of the liquid crystal display panel shown in Fig. 14; and Fig. 16 is an enlarged view of the portion designated10 by C in Fig. 15.
The first embodiment of the present invention will now be explained by referring to the accompanying drawings.
Fig. 5 is a front view of the liquid crystal display panel according to the first embodiment of the present invention. Fig. 6 illustrates the disposition of the electrodes for the liquid crystal display panel. Fig. 7 is a sectional view of the panel shown in Fig. 5. Fig. 8 is an enlarged view of the portion designated by B in Fig. 7.
Throughout the drawings, numerals 1 to 14 designate the same or equivalent portions. Numeral 15 designates electrode patterns defined in the form of a frame around the effective display range 14 of the upper and lower glass substrates 2 and 3. Numeral 16 designates conductor members adapted to connect the electrode patterns 15 of the upper and lower glass substrates 2 and 3. Numeral 17 designates a drive circuit for the electrode patterns around the effective display range 14 and mounted on the substrate 11 together with the drive circuits 9 and 10.
In the liquid crystal display apparatus constituted in the abovedescribed manner, the same voltage as that which is applied to the picture elements 7 when they are not in the display mode is applied to the electrode patterns 15 provided around the effective display range 14 of the liquid crystal display panel 1 from the exclusive drive circuit for the electrode patterns. As a result, the color hue of the background around the effective display range 14 becomes the same as that of the background in the effective display range 8, so the boundary between the effective display range and the portion surrounding it disappears.
If any boundary exists between the effective display range and the portion surrounding it, particularly when the color of the background around the effective display range is the same as that of the picture elements, it will be difficult to distinguish those characters and pictures that are constituted by elements at the extreme outer portion of the effective display range. If there is no such boundary, however, the above-mentioned problems can be eliminated, and the display quality can thus be improved.
It should be understood that while electrode patterns 15 that form a rectangular frame have been described in connection with the abovementioned embodiment, the electrode patterns 15 may in fact be divided into electrode patterns that are respectively equivalent to the scanning electrodes 5 and the signal electrodes 6. In this case, exclusive drive circuits may be provided for the respective electrodes, so that the same effect as that of the embodiment described above can be attained.
Fig. 9 illustrates in greater detail the drive circuit 9 for the signal electrodes and the drive circuit 10 for the scanning electrodes, both of these drive circuits being connected to the liquid crystal display panel 1. The drive circuits 9 and 10 are respectively comprised of a plurality of LSI's for drive. As can be seen from the drawing, with a liquid crystal display comprising 640 dots by 200 dots, the drive circuit 9 for the signal electrodes is made up of 8 LSI's. LSI1 through LS18, while the drive circuit 10 for the scanning electrodes is made up of 3 LSI's, LSI9 through LSI11. LS11 through LSI11 are respectively designed for 80 bits, 1/200 duty and 1/15 bias.
Fig. 10 illustrates one of the drive LSI's 1 through 8 in the drive circuit 9 for the signal electrodes, such as the drive LSI1 which is adapted to generate drive signals 451 - ho. This LSI is comprised of 80 bit shift register 101, 80 bit latch 102, 80 bit level shifter 103 and 80 dot-4 level driver 104. Figs. 11A through 11C illustrate signal wave forms to assist in explaining operation of the drive circuit 9 for the signal electrodes shown in Fig. 10. When the clock pulse CP is input to the 80 bit shift register 101, load pulse signal (Fig. 11A) is input to the 80 bit latch 102 and voltage level signals V,. V3, V4 and V EE, are applied to the 80 dot-4 level driver 104, then the driver 104 outputs the signal electrode drive signals 4), - so (Fig. 11C). Fig. 11B illustrates the latch data which is output from the 80 bit latch 102.
Fig. 12 illustrates one of the drive LSI's 9 through 11 in the drive circuit 10 for the scanning electrodes, for A -11example the drive LS19 adapted to generate drive signals 4), - 08o. This LSI is composed of 80 bit shift register 121, 80 bit level shifter 122 and 80 dot-4 level driver 123. Figs. 13A and 13B illustrate signal wave forms for the purpose of explaining operation of the drive circuit 10 for the scanning electrodes. When the clock pulse CP (Fig. 13A) is input to the 80 bit shift register 121 and voltage level signals V,, V2, Vs and V EE' are applied to the 80 dot-4 level driver 123, the scanning electrode drive signals 01, 45so (Fig. 13B) are then output from the driver 123.
The second embodiment of the present invention will next be explained by referring to the accompanying drawings. Fig. 14 illustrates disposition of the electrodes of the liquid crystal display panel shown in Fig. 5. Fig. 15 is a sectional view of the display panel shown in Fig. 14. Fig. 16 is an enlarged view of the portion designated by C in Fig. 15. In these drawings, numerals 1 through 14 show members which are the same or equivalent to those illustrated in Figs. 1 through 4. Numeral 18 designates an upper electrode which is outside the effective display range. Numeral 19 designates a lower electrode which is outside the effective display range. These electrodes are provided in the same manner as the scanning electrodes 5 which are outside the effective display range and are driven by the drive circuit 9 for the scanning electrodes. Numeral 20 designates a leftside electrode which is outside the effective display range and numeral 21 designates a right side electrode, also outside the effective display range, these electrodes being provided outside the effective -12display range to the left and right in the same manner as the signal electrodes 6 and being adapted to be driven by the drive circuit 10 for the signal electrodes.
In the liquid crystal display apparatus constituted as above, the upper electrodes 18 and the lower electrodes 19, both of which are outside the effective display range and which are equivalent in function to the scanning electrodes 5, as well as the left electrode 20 and the right electrode 21 which are also outside the effective display range and are equivalent in function to the signal electrodes 6, are provided outside the effective display range 14 in such a manner as to surround the effective display range 8. Thus, when the liquid crystal display panel 1 is operative for display, the same voltage as that which is applied to the display picture elements 7 inside the effective display range 8 when they are not in the display mode is applied to these electrodes 18 to 21 from the drive circuit 9 for the scanning electrodes and the drive circuit 10 for the signal electrodes, so that the color of the background 14 around the effective display range can be made the same as that of the back ground 8 within the effective display range, so that no boundary appears between the effective display range and the portion around it. In this way, if the picture elements 7 at the extreme outer portion of the effective display range 8 are used for constituting characters and pictures, the display quality of these characters and pictures can be improved.
It is to be noted that, while in the above-explained embodiment each one of the upper electrode (18), the lower 1 -13electrode (19), the left electrode (20) and the right electrode (21) are provided outside the effective display range (14), a similar effect may be attained if a plurality of such electrodes are disposed at the respective locations.
The drive circuits for the upper and lower electrodes 18, 19 and the left and right electrodes 20, 21 which are outside the effective display range are provided in a number corresponding to that of the patterns of the scanning and signal electrodes and are comprised of drive LSI's which are respectively the same as the LSI's shown in Fig. 10 and Fig. 12. These drive LSI's are adapted to be energized when the liquid crystal display panel is operative for display. A voltage at the same level as that which is available when there are no display data is applied from the respective drive LSI's for the left and right electrodes 20, 21 for the signal electrodes to the corresponding electrodes.

Claims (1)

  1. Claims: 1. A liquid crystal display apparatus comprising a liquid crystal
    display panel having signal electrode means and scanning electrode means which are arranged in a matrix configuration, the signal and scanning electrode means being comprised of transparent electrode membranes between an upper glass substrate and a lower glass substrate, a first drive circuit means adapted to drive said signal electrode means and a second drive circuit means adapted to drive said scanning electrode means, wherein when said signal electrode means and said scanning electrode means are driven, characters or pictures are displayed on said liquid crystal display panel, said liquid crystal display apparatus being characterized by; electrode pattern means provided around the effective display range of said liquid crystal display panel, and drive means adapted to drive said electrode pattern means so that when said liquid crystal display panel is operative for display, the color hue of the background around said effective display range becomes the same as that of the background within said effective display range. 2. A liquid crystal display apparatus as claimed in claim I further characterized in that said electrode pattern means is divided into a first and a second electrode pattern means equivalent respectively to said signal electrode means and said scanning electrode means. 3. A liquid crystal display apparatus as claimed in claim 2 further characterized in that said drive means is comprised of a first electrode pattern drive circuit adapted
    7 to drive said first electrode pattern means and a second electrode pattern drive circuit adapted to drive said second electrode pattern means.
    4. A liquid crystal display apparatus as claimed in Claim I further characterized in that said electrode pattern means is divided into a first and a second electrode pattern means respectively equivalent to said signal electrode means and said scanning electrode means, said drive means is comprised of a first electrode pattern drive circuit adapted to drive said first electrode pattern means and a second electrode pattern drive circuit adapted to drive said second electrode pattern means, and said first drive circuit means includes said first electrode pattern drive circuit and said second drive circuit means includes said second electrode pattern drive circuit.
    5. A liquid crystal display apparatus having a liquid crystal display panel with an effective display range and wherein, when the display panel is operative for display, the background around said effective display range has substantially the same color as the background within the effective display range.
    6. A display apparatus according to claim 5 wherein a separate drive circuit is provided for electrodes associated with the background around the effective display range.
    7. - A liquid crystal display apparatus constructed and arranged substantially as hereinbefore described with reference to and as illustrated in Figures 5 to 16 of the accompanying drawings.
    Published 1989 at The Patent Office, State House, 86171 High Holborn. London WC1R 4TP. Further copies maybe obtained from The Patent or&A.
    Suleo 2rar-en, StlltuEX5.7M2). IllrintedbyMultiplex techniques ltd, St Mary Cray, Kent, Con. 1187 -- -. -- -- -- ---- --- --- ----,y --j- -, ---j V CV, Cub, Lice
GB8901175A 1988-01-19 1989-01-19 Liquid crystal display apparatus Withdrawn GB2214342A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP864888A JPH01185526A (en) 1988-01-19 1988-01-19 Liquid crystal display device
JP864788A JPH01185525A (en) 1988-01-19 1988-01-19 Liquid crystal display device

Publications (2)

Publication Number Publication Date
GB8901175D0 GB8901175D0 (en) 1989-03-15
GB2214342A true GB2214342A (en) 1989-08-31

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Application Number Title Priority Date Filing Date
GB8901175A Withdrawn GB2214342A (en) 1988-01-19 1989-01-19 Liquid crystal display apparatus

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KR (1) KR890012184A (en)
DE (1) DE3901761A1 (en)
GB (1) GB2214342A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394814A1 (en) * 1989-04-24 1990-10-31 Asulab S.A. Improved electro-optical display cell
EP0414988A2 (en) * 1989-09-01 1991-03-06 Canon Kabushiki Kaisha Display system
US6831662B1 (en) 2000-11-08 2004-12-14 Palmone, Inc. Apparatus and methods to achieve a variable color pixel border on a negative mode screen with a passive matrix drive
US6961029B1 (en) 2000-11-08 2005-11-01 Palm, Inc. Pixel border for improved viewability of a display device
GB2454030A (en) * 2007-10-24 2009-04-29 Plastic Logic Ltd Edgeless display device
US7724270B1 (en) 2000-11-08 2010-05-25 Palm, Inc. Apparatus and methods to achieve a variable color pixel border on a negative mode screen with a passive matrix drive
US7920320B2 (en) 2007-02-07 2011-04-05 Plastic Logic Limited Electronic reading devices
WO2011080517A2 (en) 2010-01-04 2011-07-07 Plastic Logic Limited Electronic document reading devices
US8203546B2 (en) 2007-02-07 2012-06-19 Plastic Logic Limited Electronic document reading devices
US8207947B2 (en) 2007-02-07 2012-06-26 Plastic Logic Limited Electronic document readers and reading devices
US8228323B2 (en) 2008-03-03 2012-07-24 Plastic Logic Limited Electronic document reader system
US9001024B2 (en) 2008-09-05 2015-04-07 Plastic Logic Limited Electronic document reader

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223309A1 (en) * 1985-11-19 1987-05-27 Koninklijke Philips Electronics N.V. Display device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223309A1 (en) * 1985-11-19 1987-05-27 Koninklijke Philips Electronics N.V. Display device

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394814A1 (en) * 1989-04-24 1990-10-31 Asulab S.A. Improved electro-optical display cell
EP0414988A2 (en) * 1989-09-01 1991-03-06 Canon Kabushiki Kaisha Display system
EP0414988A3 (en) * 1989-09-01 1992-09-09 Canon Kabushiki Kaisha Display system
US5784037A (en) * 1989-09-01 1998-07-21 Canon Kabushiki Kaisha Display system
US7724270B1 (en) 2000-11-08 2010-05-25 Palm, Inc. Apparatus and methods to achieve a variable color pixel border on a negative mode screen with a passive matrix drive
US6831662B1 (en) 2000-11-08 2004-12-14 Palmone, Inc. Apparatus and methods to achieve a variable color pixel border on a negative mode screen with a passive matrix drive
US6961029B1 (en) 2000-11-08 2005-11-01 Palm, Inc. Pixel border for improved viewability of a display device
US7324072B1 (en) 2000-11-08 2008-01-29 Palm, Inc. Pixel border for improved viewability of a display device
US7362338B1 (en) 2000-11-08 2008-04-22 Palm, Inc. Controllable pixel border for improved viewability of a display device
US8207947B2 (en) 2007-02-07 2012-06-26 Plastic Logic Limited Electronic document readers and reading devices
US8203546B2 (en) 2007-02-07 2012-06-19 Plastic Logic Limited Electronic document reading devices
US7920320B2 (en) 2007-02-07 2011-04-05 Plastic Logic Limited Electronic reading devices
GB2454033A (en) * 2007-10-24 2009-04-29 Plastic Logic Ltd Portable paperless electronic printer
WO2009053743A1 (en) 2007-10-24 2009-04-30 Plastic Logic Limited Electronic document reader
US20090113291A1 (en) * 2007-10-24 2009-04-30 Plastic Logic Limited Electronic Document Reader
GB2454032A (en) * 2007-10-24 2009-04-29 Plastic Logic Ltd Edgeless document viewer
GB2454030A (en) * 2007-10-24 2009-04-29 Plastic Logic Ltd Edgeless display device
US8539341B2 (en) 2007-10-24 2013-09-17 Plastic Logic Limited Electronic document reader
US8711395B2 (en) 2007-10-24 2014-04-29 Plastic Logic Limited Electronic document reading devices
US8836970B2 (en) 2007-10-24 2014-09-16 Plastic Logic Limited Document printing techniques
US8228323B2 (en) 2008-03-03 2012-07-24 Plastic Logic Limited Electronic document reader system
US9001024B2 (en) 2008-09-05 2015-04-07 Plastic Logic Limited Electronic document reader
WO2011080517A2 (en) 2010-01-04 2011-07-07 Plastic Logic Limited Electronic document reading devices

Also Published As

Publication number Publication date
DE3901761C2 (en) 1992-04-30
DE3901761A1 (en) 1989-08-03
KR890012184A (en) 1989-08-24
GB8901175D0 (en) 1989-03-15

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