WO2001016644A1 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

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Publication number
WO2001016644A1
WO2001016644A1 PCT/GB2000/003308 GB0003308W WO0116644A1 WO 2001016644 A1 WO2001016644 A1 WO 2001016644A1 GB 0003308 W GB0003308 W GB 0003308W WO 0116644 A1 WO0116644 A1 WO 0116644A1
Authority
WO
WIPO (PCT)
Prior art keywords
panel
display
modulating
output
display device
Prior art date
Application number
PCT/GB2000/003308
Other languages
English (en)
Inventor
Timothy Martin Coker
Original Assignee
Screen Technology Limited
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 Screen Technology Limited filed Critical Screen Technology Limited
Publication of WO2001016644A1 publication Critical patent/WO2001016644A1/fr

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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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
    • 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
    • G02F1/133374—Constructional arrangements; Manufacturing methods for displaying permanent signs or marks

Definitions

  • PL-LCDs photo-luminescent liquid-crystal displays
  • narrow-band activation light generally in the near-UV or sub-blue part of the spectrum
  • phosphors which emit visible light with lambertian characteristics.
  • Such displays have optimum viewing angles and are in principle more efficient than conventional displays because of the absence of absorbing colour filters.
  • the modulators themselves generally have improved performance over other types of display since they are not required to modulate wide-band visible light but can be optimised for the narrow-band activation light. See for instance WO 95/27920 (Crossland et al . ) or Crossland et al, SID International Symposium Digest of Technical Papers Vol. 28, pp 837-840 (1997) .
  • Flat-panel displays generally have an extended modulating substrate or panel, typically a liquid-crystal cell, in which substantially the entire active area is used for display; in the case of conventional LCDs the panel modulates input light which ten passes on to the viewer, while in PL-LCDs the cell modulates the activation light, the modulated light then illuminating a further substrate which carries active output elements, generally visible phosphors.
  • the active area of the panel is defined as that area through which activation light from the backlight passes prior to striking the phosphor elements . It is also understood that the term “modulating panel” or "substrate” of necessity includes the entire active area.
  • two types of information can be displayed: changing or dynamic information and static information.
  • a typical example would be airport annunciators, where the changing information would be flight times and details, and the non-changing information could the name of the airport, or perhaps the terminal in which the annunciator was situated.
  • These two types of information can be generated in several ways; for instance, the static information could just be painted onto the casing of the display.
  • US-A-4514920 Shafrir et al . ) as a variant example shows a silk-screened logo printed on a reflector behind a liquid-crystal display.
  • the static information uses up part of the display area that could otherwise be used for dynamic information. This is obviously wasteful.
  • a display comprising a modulating panel or substrate capable of modulating activation light input from the rear and an output panel receiving modulated light from the modulator panel and producing a corresponding visible output; in which the output panel includes two types of region of output element.
  • the first type of region is used to display dynamic information the other to display static (time-invariant) information.
  • Prior-art displays commonly use part of the modulatable display area to display only static information, but this is wasteful.
  • the invention advantageously has a portion of the area of the modulating substrate not modulating the activation light; this area is then used to illuminate a specific part of the output panel that contains the static information in the pattern of the output elements, generally phosphors, deposited thereon.
  • the spatial type can only generate static information (i.e. if it says "Heathrow Airport” it can only say "Heathrow Airport")
  • the other pattern referred to here as a temporal pattern
  • the temporal pattern can take various forms, most commonly a pixellated or regular array pattern, but others are also possible, for example 7-segment patterns for displaying numerals.
  • the new type of display described in this application will contain these two types of region: one in which the displayed pattern (and therefore the information) can be changed; and the other in which the displayed information cannot be changed.
  • these two types of pattern will be referred to as temporal (for the changing information) and spatial (for the static or non- changing information such as a logo) .
  • Temporal patterns are contained within the dynamic regions, spatial patterns within the static regions.
  • temporal pattern is chosen because of the nature in which such a pattern is made to display information. Generally the temporal pattern actually displays no information at all unless it is modulated (in the case of a PL-LCD display, of course, it is the activation light that is being modulated) . The modulation by its nature changes with time (i.e. the information being displayed is dynamic) and so the term “temporal” is used. Examples of the type of information displayed by the spatial patterns might be:
  • activation light will generally pass through the active area of the modulating substrate in the normal way.
  • this illumination the requirement for temporal modulation of this light is different. At the very simplest this light might not be modulated at all, and the spatial pattern (s) would be constantly illuminated as long as the display was powered up.
  • Other requirements might be:
  • a display comprising a modulating panel or substrate capable of modulating activation light input from the rear and an output panel receiving modulated light from the modulator panel and producing a corresponding visible output; in which the active area of the modulator includes an area which is not adapted to modulate the activation light but merely allows it to strike the output panel.
  • the active area need not consist wholly of physical components; for example, part of the active area may simply be empty allowing the activation light to strike the output panel directly.
  • any area that modulates light can also serve as a non-modulating area, simply by continually addressing that area with unchanging data.
  • references to non-modulating areas refer to portions of the modulating panel or substrate, or of the output panel, that are physically distinct or spatially separated from those portions that can modulate the light (whether or not they actually do so) .
  • the modulating substrate is adapted to illuminate the two types of region on the output panel in different ways.
  • the temporal patterns are illuminated through a pixellated area, or similar by subdivided area, of the modulator, in such a way that the temporal patterns can be used to represent arbitrary images in the normal manner of a display (images being understood to include images of text) ; while the spatial patterns or logos are illuminated through different parts of the modulating substrate.
  • the information in the spatial pattern is encoded in the spatial arrangement of the phosphor, there is no need for these latter areas of the modulating panel themselves to have any spatial variation (although for reasons of conformity with current designs of modulator they might) . In the simplest case, of course, such an area would be an empty part of the substrate (i.e. a hole) .
  • the areas of the modulator through which a logo is illuminated can be thought of as very large pixels, or 'macro-pixels'.
  • complex logos or other patterns can be created by the use of multiple spatial patterns each possibly illuminated by a separate macro-pixel.
  • modulate the backlight directly if it consists of suitably arranged sub-elements. For instance, parts of the backlight that illuminate a logo under the day/night scheme described above would be directly dimmed at night.
  • a display comprising a modulating panel or substrate capable of modulating activation light input from the rear and an output panel receiving modulated light from the modulator panel and producing a corresponding visible output, and a backlight for producing the activation light, in which sub-elements within the backlight can be individually and directly modulated, for example by dimming them at night, in order to vary the output of the output panel.
  • a spatial pattern on the output panel will be internally patterned, i.e. constructed of individual elements, or of one element of an unusual shape, in such a way that the pattern either carries information (the aforementioned company logo for example) or serves a purpose, perhaps by forming a luminous border or constituting a permanent sign.
  • the logo could reproduce a monochrome pattern by using, for example, appropriate regions of phosphor and between them a material for absorbing the activation light.
  • a colour pattern would be reproduced by including one or more phosphor regions within the spatial pattern.
  • the brightness of individual areas of phosphor within the overall pattern can be varied, for instance by varying the constitution of the material or by mixing it with a non-emitting material.
  • the patterned phosphor regions may be solid, or they may themselves be made up of individual phosphor dots. Such a constitution allows both colour and brightness variation over the plane by the use of appropriate sizes and densities of dots of a given colour.
  • the temporal pattern (s) on the output panel may or may not themselves be internally patterned; furthermore the patterning if present need not correspond directly to any patterning of the modulator.
  • both modulator and output panel may be pixellated, or both may be patterned in some other way such as a seven-segment numerical display.
  • the modulator may be patterned and the output panel not; this would be fine for a monochrome display, for instance .
  • Patterning of all areas of the output panel can consist of areas of different phosphors or areas of phosphors and an absorbing material; for example, a pixellated colour display would consist of sub-pixels of red, green and blue phosphors embedded within a 'black matrix' of an absorbing material.
  • the spatial pattern (s) on the output panel would normally have the same general make-up as the display region, the two being integrated on the same substrate.
  • a set of detachable spatially patterned portions to be fitted into a display so that different backgrounds or captions can be accommodated.
  • the same modulating panel could be designed to work with different output panels, which themselves may be detachable .
  • a display as described here may be designed for Railtrack; different output panels would reflect the actual name of the station or the platform number but would otherwise be identical.
  • Figure 1 shows an exploded sectional view of a PL-LCD display system embodying the invention
  • Figure 2 shows diagrammatically how spatial and temporal patterns might be arranged, in accordance with the invention
  • Figure 3 shows a numeric display with four numerals in the standard seven-segment form together with a spatial pattern in the form of a company logo based on the format of Fig . 2 ;
  • Figure 4 shows a more complex logo which includes both greyscale and colour variation.
  • Figure 1 shows a schematic diagram of a photo- luminescent display, comprising a backlight 1 emitting UV radiation at about 388 nm, a modulator 3 addressed by suitable electrodes, not shown, and an output panel 5.
  • the details of the modulator are not shown but by preference it will incorporate an electro-optic modulator such as a liquid-crystal cell.
  • the backlight may contain collimating elements.
  • the output panel 5 can be, for instance, a sheet coated with phosphor elements or a phosphor layer. It can usefully be made removable, so that the logo can be changed without replacing the entire display.
  • the modulator block 3 contains addressable elements (not shown) .
  • the right-hand part is static, at least as far as its information content is concerned.
  • This modulated light 30 emerges from the left-hand part and unmodulated light 32 from the right, to strike the phosphor.
  • Figure 2 schematically shows a simple arrangement of the output panel with a temporal pattern or dynamic region 52 and one spatial pattern or static region 54, in accordance with the invention.
  • the backlight and the phosphor sheet cover substantially the entire active area 56, but the liquid crystal that would otherwise be present under the spatial pattern 54 of the display is replaced by a simple glass sheet, or even an air gap, minimising absorption losses.
  • the spatial pattern 54 is lit all the time that the display is switched on.
  • the display of Figure 3 shows how this principle can be used to realise a simple digital clock with a monochrome company logo.
  • the clock numerals are located in the temporal pattern 52 and of course change with time, while the logo is located within the spatial pattern 54.
  • the central dots between the numerals may be modulated (i.e. another temporal pattern), in which case they could be arranged to flash to indicate seconds, or they may be a simple spatial pattern as shown by the dotted area 54a.
  • the areas outside the pattern are coated with absorbent material.
  • Figure 4 shows a logo representing an example of a spatial pattern 54. Here elements of the logo are of different brightness, as can be seen, and of different colours if desired.
  • These elements are made of phosphor regions 60 of different constitution, perhaps by screen printing phosphor dots of different density in a three-colour process or by application of ready- made mixtures including different proportions of emitting and absorbing materials.
  • the un-modulated, uniform backlighting then produces the variegated display.
  • modulation is used to mean that a time-varying image is possible, normally achieved of course by applying sets of voltages sequentially to electrodes covering the modulatable panel area.
  • output elements have generally been referred to as phosphors it should be understood that they could be any luminous material or indeed a mixture of materials. For example a purple-emitting element would be made by mixing red- and blue-emitting phosphors.
  • a liquid- crystal cell as the modulator, but it should be clear that other types are possible.
  • a plasma display panel can be used; here the macro-pixels would probably be made up of plasma cells that are permanently on.
  • the invention is conceivably applicable to display types other than PL- LCD, for example STN or TFT flat-panel displays. In these cases the activation radiation would be replaced by wideband visible light and the output elements would be absorbing colour filters rather than phosphors .

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

L'invention concerne un dispositif d'affichage qui comprend un assemblage de rétroéclairage (1) qui émet une lumière d'activation à bande étroite, de préférence dans les UV, un panneau de sortie (5) devant l'écran contenant des éléments qui, lorsqu'ils sont éclairés par la lumière d'activation, émettent une lumière visible correspondante; et un modulateur à cristaux liquides (3) pour la lumière d'activation, disposé entre le rétroéclairage et le panneau. Le panneau de sortie comprend une ou plusieurs zones (54) qui ne reçoivent qu'une lumière d'activation non-modulée en plus des zones (52) qui reçoivent la lumière d'activation modulée, les zones 'fantômes' peuvent être utilisées, afin d'afficher des informations permanentes, telles que des logos ou des bordures.
PCT/GB2000/003308 1999-08-27 2000-08-25 Dispositif d'affichage WO2001016644A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9920406.7 1999-08-27
GB9920406A GB2353890A (en) 1999-08-27 1999-08-27 Display arrangement

Publications (1)

Publication Number Publication Date
WO2001016644A1 true WO2001016644A1 (fr) 2001-03-08

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PCT/GB2000/003308 WO2001016644A1 (fr) 1999-08-27 2000-08-25 Dispositif d'affichage

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WO (1) WO2001016644A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2373620B (en) * 2001-03-21 2005-05-18 Univ Cambridge Tech Light source arrangement for displays
CN106289728B (zh) * 2016-08-19 2019-03-12 苏州茂立光电科技有限公司 裸视板光学测试治具及其使用方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231034A (en) * 1978-05-31 1980-10-28 Siemens Aktiengesellschaft Display device for illustrating variable and fixed information
JPS62170815A (ja) * 1986-01-23 1987-07-27 Koito Mfg Co Ltd 液晶表示装置
US5251393A (en) * 1991-03-22 1993-10-12 Cesare Gallone Luminous display device for electric equipments
WO1995027920A1 (fr) * 1994-04-06 1995-10-19 Screen Technology Limited Ecran d'affichage
EP0926469A2 (fr) * 1997-12-23 1999-06-30 Mannesmann VDO Aktiengesellschaft Unité d'affichage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3214988A1 (de) * 1982-04-22 1983-10-27 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur darstellung von festinformationen auf einer lcd-anzeige
US4514920A (en) * 1982-11-16 1985-05-07 Doron Shafrir Display module
DE8716706U1 (fr) * 1987-12-18 1989-04-13 Diehl Gmbh & Co, 8500 Nuernberg, De

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231034A (en) * 1978-05-31 1980-10-28 Siemens Aktiengesellschaft Display device for illustrating variable and fixed information
JPS62170815A (ja) * 1986-01-23 1987-07-27 Koito Mfg Co Ltd 液晶表示装置
US5251393A (en) * 1991-03-22 1993-10-12 Cesare Gallone Luminous display device for electric equipments
WO1995027920A1 (fr) * 1994-04-06 1995-10-19 Screen Technology Limited Ecran d'affichage
EP0926469A2 (fr) * 1997-12-23 1999-06-30 Mannesmann VDO Aktiengesellschaft Unité d'affichage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 012 (P - 655) 14 January 1988 (1988-01-14) *

Also Published As

Publication number Publication date
GB2353890A (en) 2001-03-07
GB9920406D0 (en) 1999-11-03

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