WO2003041040A2 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

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Publication number
WO2003041040A2
WO2003041040A2 PCT/IB2002/004702 IB0204702W WO03041040A2 WO 2003041040 A2 WO2003041040 A2 WO 2003041040A2 IB 0204702 W IB0204702 W IB 0204702W WO 03041040 A2 WO03041040 A2 WO 03041040A2
Authority
WO
WIPO (PCT)
Prior art keywords
display device
coating
wavelength
screen
selective
Prior art date
Application number
PCT/IB2002/004702
Other languages
English (en)
Other versions
WO2003041040A3 (fr
Inventor
Johannes M. A. A. Compen
Gosse C. De Vries
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to AU2002339692A priority Critical patent/AU2002339692A1/en
Publication of WO2003041040A2 publication Critical patent/WO2003041040A2/fr
Publication of WO2003041040A3 publication Critical patent/WO2003041040A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/16—Optical or photographic arrangements structurally combined with the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H01J29/898—Spectral filters
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J2211/44—Optical arrangements or shielding arrangements, e.g. filters or lenses

Definitions

  • This invention relates to a display device comprising a display screen, said display screen being provided with a selective light-absorbing outer coating on an outer side of said screen.
  • anti- reflection (AR) films are very effective in reducing the specularly reflected ambient light.
  • the present invention primarily relates to the problem of diffusely reflected ambient light, which originates from daylight, which is reflected, for example, at the phosphor layer of a CRT.
  • the application of spectrally selective coating structures attached to the outer surface of the display screen will firstly reduce the amount of ambient light reaching the phosphor layer, .and will secondly reduce the amount of this light after it has been diffusely reflected at the phosphor layer.
  • the spectrally selective coating will reduce reflected ambient light twice, whereas the luminance L of the light generated by the phosphor layer under electron bombardment (i.e.
  • LCP luminance contrast performance
  • a display screen is provided with an outer filtering layer, comprising a black dye which contains a metal oxide.
  • a black or grey screen appearance is achieved thereby.
  • the inclusion of a black dye in the outer filtering layer results in a deterioration of the amount of light exiting the display without any improvement of the LCP.
  • an object of the present invention is to provide a display device which has a non-colored appearance and which exhibits an improved luminance contrast performance (LCP), at the same time overcoming the drawbacks of the prior art.
  • LCP luminance contrast performance
  • a display device as described in the opening paragraph, said display device being characterized in that said display screen is further provided with a wavelength-selective absorbing inner layer on an inner side of said screen. Light within a first wavelength interval will thus be absorbed by said absorbing inner layer, and light within a second wavelength interval will be absorbed by the selective light- absorbing outer coating. This renders it possible to neutralize the color reflected from said display device.
  • said wavelength-selective absorbing inner layer is suitably arranged so as to absorb wavelengths outside a wavelength interval of about 500 to 560 nm, i.e. essentially green light is transmitted. The violet appearance of prior art absorbing coatings on the outside of the display may be neutralized thereby.
  • said wavelength-selective absorbing inner layer is provided as a color filter, such as a green color filter.
  • a color filter such as a green color filter.
  • said display device comprises a fluorescent phosphor pattern, and while said wavelength- selective absorbing inner layer is arranged between said fluorescent phosphor pattern and the inner side of said screen.
  • said display device comprises a fluorescent phosphor pattern comprising separated fluorescent areas for the colors red, green, and blue, respectively, .and said wavelength-selective absorbing inner layer is arranged between the green fluorescent phosphor areas and the inner side of said screen.
  • said display device comprises a fluorescent phosphor pattern, and said wavelength-selective absorbing inner layer is arranged as a pigment coating around phosphor particles of said phosphor pattern.
  • the invention may then be realized in a CRT or the like, without adding extra components, apart from the pigments.
  • said display device comprises a fluorescent phosphor pattern comprising separated fluorescent areas for the colors red, green, and blue, respectively, while said wavelength-selective absorbing inner layer is arranged as a pigment coating around the green fluorescent phosphor particles and the inner side of said screen.
  • a construction is achieved thereby, that may be used with prior art devices having a common spectrally selective outer coating with a violet appearance.
  • said display device further comprises a coating which is one from among the following: an anti-reflection coating, an .anti-static coating, and an electrostatically shielding coating, or any combination thereof, on an outer side of said selective light-absorbing outer coating. It is possible thereby to combine good anti-reflection properties of the display with an improved LCP.
  • said selective light-absorbing outer coating is integrally formed with said second outer coating in order to minimize the number of coatings that is to be applied.
  • Fig. 1 is a schematic drawing showing a cross-section of a cathode ray tube in which the present invention is applied.
  • Fig. 2 is a schematic drawing showing a detail of a display screen of a cathode ray tube, as shown in Fig. 1.
  • Fig. 3 is a graph showing the reflection relative to that of bare glass as a function of the wavelength of incident light, using a modified IRIS coating, i.e. an AR coating with a spectrally selective absorbing dye.
  • a selective light-absorbing outer coating 2 such as an absorbing dye transmission coating, on the outer side of a display screen 1, should absorb light (daylight) in between the green and red peaks of the radiation spectrum. This is approximately 560 nm (orange), which results in the use of a dye having a purple color. For the reasons stated above, this purple appearance is undesired for most applications. Consequently, there is a need to reduce such a purple appearance of a display screen, and it is to such a reduction that this invention relates.
  • the color appearance of the selective light-absorbing coating may be influenced by adding a color to the inside of the screen.
  • a compensation material is at least partly provided on the inside of the display screen, so that external light reflected at, for example, a phosphor layer, is given a color complementary to purple, i.e. green light. The light reflected in said display screen will appear to be less purple to a viewer as a result.
  • a cross-section of a cathode ray tube display (CRT), to which the invention may be applied, is shown.
  • the display comprises a display screen 1 having an inner side and an outer side.
  • the central part of the display screen 1 is manufactured from a transparent material such as glass, and is not of major importance to this invention.
  • a selective light-absorbing outer coating 2 is arranged on the outer side of the display screen, facing a potential viewer.
  • said selective light-absorbing outer coating is a chrominance coating comprising a transparent matrix with a dye or pigment incorporated therein.
  • a wavelength-selective absorbing inner layer 3 is arranged, said layer partly covering said inner surface of the display screen 1.
  • a screen as shown in Fig. 1 may be used for generating a full-color CRT display.
  • the inner surface of the display is provided with a layer of luminescent material, such as phosphor, and an electron beam is arranged to hit the phosphor, thereby generating light.
  • a full-color display such as an RGB display
  • separate phosphor pixels or stripes are arranged for generating the colors red, green, and blue, respectively.
  • the invention may be realized in two ways, as will be described below.
  • a first embodiment of this invention is shown in greater detail in Fig. 2, showing a portion of the display screen, for example for a CRT, in cross-section.
  • a patterned fluorescent layer 4 is arranged, here shown as stripes 4R, 4G, 4B, for generating red, green, and blue light, respectively.
  • a filtering layer 3' for absorbing the complementary color of green is arranged for every third stripe 4G generating the color green, between said fluorescent phosphor layer 4G and said inner surface of the display screen 1.
  • Fig. 2 shows a patterned fluorescent layer 4
  • stripes 4R, 4G, 4B for generating red, green, and blue light, respectively.
  • a filtering layer 3' for absorbing the complementary color of green is arranged for every third stripe 4G generating the color green, between said fluorescent phosphor layer 4G and said inner surface of the display screen 1.
  • the external light reflected by the phosphor of the phosphor stripe 4G will only comprise green light, thereby neutralizing the violet light transmitted by the outer coating, which will result in a more neutral color appearance of the display screen while retaining the LCP improvement generated by the outer coating, as described above.
  • Light will be reflected as in prior art displays from the remaining phosphor stripes 4R,4B.
  • pigmented green phosphor may be used, for example through the use of greenish pigments.
  • a patterned fluorescent layer 4 is arranged on the inner side of the display screen, shown as stripes 4R, 4G, 4B for generating red, green, and blue light, respectively. Every third stripe 4G generating the color green is constituted by a heavily pigmented green phosphor.
  • An example of such a phosphor pigmentation is given, for example, in the patent document EP-0 836 215 and will therefore not be described in more detail herein.
  • the green pigment layer will function as a filter (3) for each covered phosphor particle as a result of this. Otherwise, the function of this embodiment is as described above with reference to the color filter application.
  • LCP and Rditr measurements on a CRT with a green filter only said filter being placed between the green light emitting phosphor stripe and the inner screen surface.
  • a first display screen provided on its inner surface with a green color filter was treated with a first dye solution during the coating process, said dye solution having a first die concentration of 0.5%.
  • a second display screen, provided on its inner surface with a green color filter was treated with a second dye solution during the coating process, said dye solution having a second die concentration of 1.0%.
  • the resulting body color impression was as follows.
  • the uncoated display screen (before the application of the coating as above) had a green appearance.
  • the display screen coated with the 0.5 % solution had a neutral appearance.
  • the display screen coated with the 1.0% solution had a clear violet appearance.
  • the resulting body color impression was as follows.
  • the uncoated display screen (before the application of the coating as above) had a greenish appearance.
  • the display screen coated with the 0.5 % solution had a light violet appearance.
  • the display screen coated with the 1.0% solution had a violet appearance.
  • a first indication is that a violet dye in combination with a greenish screen appearance, i.e. provided with a green color filter or strong green pigmented phosphor, can give an LCP gain of approximately 5%.
  • this may further be provided at no extra cost or only a low extra cost, since these display screens are already being provided with a coating.
  • a higher LCP gain can be obtained for applications for which a violet appearance may be accepted. Consequently, a display screen having a less purple or even neutral color appearance is achieved, and furthermore, since the chrominance layer also absorbs orange light, as discussed above, the inventive display screen will display a more saturated red color.
  • the LCP improvement is about 5 to 10% and the screen has a more neutral color. It may also be concluded from the above and from experiment 1 with only green color filters that a neutral display appearance is achieved.
  • the inventive inner layer and outer coating may be used together with an additional outer coating, such as an AR coating, an antistatic coating or an electrostatically shielding coating, or a combination thereof.
  • an additional coating may be formed integrally with said outer coating, thus limiting the number of separate coatings for manufacturing purposes.
  • An example of the above is shown in Fig. 3, showing the AR behavior of a modified AR coating (a LCP enhancing purple dye had been added to a standard AR coating.)
  • the use of such an AR outer coating on the outside of the display screen in combination with the inner layer and outer coating of the present invention is advantageous, for example for the picture quality.
  • the AR coating used in Fig. 3 is an IRIS coating.
  • the IRIS coating is a 2- or 3-layer AR coating that is commercially available on, for example, monitor tubes, manufactured by the applicant of the present invention, and that in fact incorporates a CAS coating, as described above, in one or two of its constituting layers.
  • the graph of Fig. 3 shows that even with the dye, the AR properties of the IRIS coating remain intact (more or less the same performance as for the standard IRIS coating), and moreover the dye will increase the LCP. In other words, it is both theoretically and practically possible to combine the present invention with the benefits of AR coatings.
  • the invention was described above with reference to a cathode ray tube, the invention is equally applicable to other types of displays having separated emission areas for different colors of a displayed picture, such as PDPs and LCDs. Furthermore, it is also possible to use the invention in displays with more or fewer colors, such as a monochrome display. Furthermore, the invention may be used in combination with other coating structures, such as an AR coating, as described above, or an ES (electrostatically in shielding) coating.
  • an AR coating as described above
  • ES electrostatically in shielding

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Optical Filters (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

L'invention porte sur un dispositif d'affichage consistant en un écran (1) muni sur un de ses côtés extérieurs d'un revêtement extérieur (2) à absorption sélective de la lumière, et sur un de ses côtés intérieurs d'une couche intérieure (3) à absorption sélective de certaines longueurs d'onde.
PCT/IB2002/004702 2001-11-08 2002-11-05 Dispositif d'affichage WO2003041040A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002339692A AU2002339692A1 (en) 2001-11-08 2002-11-05 Display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP01204259.4 2001-11-08
EP01204259 2001-11-08

Publications (2)

Publication Number Publication Date
WO2003041040A2 true WO2003041040A2 (fr) 2003-05-15
WO2003041040A3 WO2003041040A3 (fr) 2004-05-27

Family

ID=8181196

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2002/004702 WO2003041040A2 (fr) 2001-11-08 2002-11-05 Dispositif d'affichage

Country Status (3)

Country Link
AU (1) AU2002339692A1 (fr)
TW (1) TW200407930A (fr)
WO (1) WO2003041040A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018230453A1 (fr) * 2017-06-14 2018-12-20 日東電工株式会社 Stratifié optique

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0742575A2 (fr) * 1995-05-10 1996-11-13 Kabushiki Kaisha Toshiba Tube à rayons cathodiques couleur
EP0764966A2 (fr) * 1995-09-20 1997-03-26 Hitachi, Ltd. Panneau afficheur à plasma
US5838105A (en) * 1996-05-09 1998-11-17 Pioneer Electronic Corporation Plasma display panel including color filters
EP0999458A2 (fr) * 1998-10-07 2000-05-10 Hitachi, Ltd. Appareil d'affichage muni d'un film laminé antiréflechissant et antistatique
EP1058285A2 (fr) * 1999-05-31 2000-12-06 Samsung SDI Co. Ltd. Tube à rayons cathodiques
US6200182B1 (en) * 1995-08-25 2001-03-13 Fujitsu Limited Method for manufacturing a surface discharge plasma display panel
JP2001290003A (ja) * 2000-04-05 2001-10-19 Sony Corp 表示装置用フィルターとその製造方法及び表示装置

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
JPS61116738A (ja) * 1984-11-12 1986-06-04 Futaba Corp カラ−蛍光表示装置
JP2667068B2 (ja) * 1991-05-24 1997-10-22 三菱電機株式会社 光選択吸収層付カラー陰極線管

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0742575A2 (fr) * 1995-05-10 1996-11-13 Kabushiki Kaisha Toshiba Tube à rayons cathodiques couleur
US6200182B1 (en) * 1995-08-25 2001-03-13 Fujitsu Limited Method for manufacturing a surface discharge plasma display panel
EP0764966A2 (fr) * 1995-09-20 1997-03-26 Hitachi, Ltd. Panneau afficheur à plasma
US5838105A (en) * 1996-05-09 1998-11-17 Pioneer Electronic Corporation Plasma display panel including color filters
EP0999458A2 (fr) * 1998-10-07 2000-05-10 Hitachi, Ltd. Appareil d'affichage muni d'un film laminé antiréflechissant et antistatique
EP1058285A2 (fr) * 1999-05-31 2000-12-06 Samsung SDI Co. Ltd. Tube à rayons cathodiques
JP2001290003A (ja) * 2000-04-05 2001-10-19 Sony Corp 表示装置用フィルターとその製造方法及び表示装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CARL K ET AL: "on the limits of the filter concept for color tv screens" , JOURNAL OF THE ELECTROCHEMICAL SOCIETY, ELECTROCHEMICAL SOCIETY. MANCHESTER, NEW HAMPSHIRE, US, VOL. 128, NR. 11, PAGE(S) 2395-2401 XP002079324 ISSN: 0013-4651 page 2395, right-hand column, line 9-11 page 2396, right-hand column, line 1,2; figure 1 *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 302 (E-445), 15 October 1986 (1986-10-15) -& JP 61 116738 A (FUTABA CORP), 4 June 1986 (1986-06-04) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 203 (E-1354), 21 April 1993 (1993-04-21) -& JP 04 345737 A (MITSUBISHI ELECTRIC CORP), 1 December 1992 (1992-12-01) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018230453A1 (fr) * 2017-06-14 2018-12-20 日東電工株式会社 Stratifié optique
JPWO2018230453A1 (ja) * 2017-06-14 2020-01-16 日東電工株式会社 光学積層体

Also Published As

Publication number Publication date
TW200407930A (en) 2004-05-16
AU2002339692A1 (en) 2003-05-19
WO2003041040A3 (fr) 2004-05-27

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