WO2000051156A1 - Color display device - Google Patents

Color display device Download PDF

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Publication number
WO2000051156A1
WO2000051156A1 PCT/EP2000/000213 EP0000213W WO0051156A1 WO 2000051156 A1 WO2000051156 A1 WO 2000051156A1 EP 0000213 W EP0000213 W EP 0000213W WO 0051156 A1 WO0051156 A1 WO 0051156A1
Authority
WO
WIPO (PCT)
Prior art keywords
display device
color
color display
phosphors
sub
Prior art date
Application number
PCT/EP2000/000213
Other languages
French (fr)
Inventor
Siebe T. De Zwart
Sybrandus Van Heusden
Gerrit Oversluizen
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 KR1020007011742A priority Critical patent/KR20010071169A/en
Priority to DE60015244T priority patent/DE60015244T2/en
Priority to JP2000601669A priority patent/JP4776078B2/en
Priority to EP20000904908 priority patent/EP1074036B1/en
Priority to KR1020077004712A priority patent/KR100898190B1/en
Publication of WO2000051156A1 publication Critical patent/WO2000051156A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J11/42—Fluorescent layers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/59—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing silicon
    • C09K11/592—Chalcogenides
    • C09K11/595—Chalcogenides with zinc or cadmium
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7777—Phosphates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/778—Borates
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/28—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 using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—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 using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—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 using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
    • H01J11/12—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided on both sides of the discharge space

Abstract

In a plasma display or a field emission display, sub-pixels having extra (non-saturating) phosphors are applied to enhance the efficacy. Depending on the luminance and color of a pixel to be displayed, driving of the most efficient combination of sub-pixels is performed.

Description

Color display device.
The invention relates to a color display device comprising a first substrate provided with a layer of fluorescent material, and a second, transparent substrate, said color display device comprising means for addressing pixels during use. The display device may be a plasma display device but also, for example, a display device of the field emission type. The address electrodes may be present on both the first and the second substrate in the case of a plasma display device. Dependent on the type of display device, the fluorescent material is patterned or not patterned.
A display device of this type is used, inter a a, in large-area, flat display screens, for example, for HDTV.
A color display device (plasma display panel or PDP) of the type mentioned above is described in EP-A-0 488 891. This application describes measures for obtaining grey values or color gradations. To this end, the frame time is divided into a plurality of sub-frames having a weighted duration (for example in the ratio 1:2:4:. „:128). When a color, for example green, is fully driven, a frequently used phosphor such as Zn2SiO4:Mn (willemite) exhibits saturation phenomena. The efficiency of the phosphor (number of emitted photons/number of incoming photons) deteriorates, so that the brightness decreases.
It is, inter aha, an object of the present invention to provide a display device of the type described, which has an optimum brightness or luminance, also when a given color is fully driven.
To this end, a color display device according to the invention is characterized m that the layer of fluorescent mateπal compπses at least two different phosphors of substantially the same color at the location of a pixel.
Substantially the same color is herein understood to mean that the difference in spectral color of the emission peaks of the phosphors, measured as the distance in C.I.E coordinates (λ, y co-ordinates) is at most 0.35 (and preferably at most 0.25) The invention is based on the recognition that the decrease of the efficiency for different phosphors depends in different manners on the number of incoming photons. By using two phosphors with a difference in a variation of the efficiency, it will be possible to mix colors of phosphors which, as regards color are (slightly) different but exhibit a different behavior as regards loss of efficiency in the case of full drive (maximum brightness), or to choose between the two phosphors.
An optimum effect is achieved when one of the two phosphors is a non- saturating phosphor. A non-saturating phosphor is herein understood to mean a phosphor in which the number of emitted photons per unit of surface and time has decreased at most 15% in the case of a drive yielding a brightness (or luminance) of 500 Cd/m2 as compared with a drive yielding a brightness of 10 Cd m2. Upon excitation by means of an UN plasma which is maintained with alternating voltages, this means that, for example, at higher frequencies (at least up to 10 kHz and preferably up to 100 kHz or more) the efficiency (number of emitted photons/number of incoming photons) decreases by at most 15%. A frequently used phosphor such as Zn SiO4:Mn (willemite) has already saturation phenomena from approximately 1 kHz in this application. The efficiency (number of emitted photons/number of incoming photons) has already dropped to approximately 90% and decreases rapidly at higher frequencies (to approximately 50% at 100 kHz).
However, for non-saturating phosphors, the efficiency remains substantially constant through a large frequency range.
Suitable non-saturating phosphors are, for example:
1) (Ce,Gd)MgB5O10:Tb, or CBT
2) (Ce,La,Gd)PO4:Tb or LAP
3) (Y,Gd)BO3:Tb. A preferred embodiment of a display device according to the invention is characterized in that the layer of fluorescent material at the location of a pixel, viewed in a direction transverse to the first substrate, comprises at least two sub-pixels having different phosphors of substantially the same color for different sub-pixels. An incoming (video) signal can now be split up, for example, into two or more sub-signals each supplying one of the sub- pixels with a separate drive signal. By means of the sub-signals, the extent of mixing of the colors is then adjusted, or a choice is made between the sub-pixels.
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiment(s) described hereinafter. In the drawings:
Fig. 1 is a diagrammatic cross-section of a part of a plasma display device; Fig. 2 shows diagrammatically a part of a plasma display device; Fig. 3 shows diagrammatically a distribution of phosphors across a pixel; while Fig. 4 shows the associated C.I.E. color triangle; and Figs. 5 to 8 show variations of Fig. 3.
The Figures are diagrammatic and not drawn to scale. Corresponding components generally have the same reference numerals.
Fig. 1 shows a plasma display device 10, in this case an AC display panel (AC PDP or AC Plasma Display Panel), having a first substrate 1 provided with two display electrodes 2 which are coated with a dielectric layer 3 (for example, glass), and a second, transparent substrate 5 provided with fluorescent material 8. In this embodiment, the second substrate 5 is provided with address electrodes 6. In the relevant embodiment, a sub-pixel as defined by the address electrode 6 and the display electrodes 2 is bounded by partition walls 7 which bound a discharge space. The partition walls 7 are not absolutely necessary, while display electrodes and address electrodes may be alternatively present on one substrate. A gas discharge mixture 9 consisting, in this embodiment, of a helium-xenon mixture, is present in the discharge space between the substrates 1, 5. Other mixtures are alternatively possible, such as neon-xenon, argon-xenon, krypton-xenon, argon-neon-xenon, argon-helium-xenon, krypton-neon-xenon, krypton-helium-xenon or mixtures thereof, the quantity of xenon being in a range between 5 and less than 100%. As is known, UV radiation is generated in plasma display devices (plasma display panels or PDPs) in the discharge space at the area of a (sub-)pixel, which UV radiation causes the fluorescent material 8 (phosphors) to luminesce. To this end, the display electrodes 2 are driven, for example, from X and Y drivers 20, 21 and the address electrodes are driven from an A driver 22 (Fig. 2). To this end, an incoming signal 11 is stored in a frame memory 12 and in a sub-frame generator 13. The required pulses are generated in the processing unit 14 for the reset pulses, the ignition pulses and the sustain pulses which energize the display electrodes 2 via the X and Y drivers 20, 21, while addressing takes place via the A driver 22 controlled by an address generator 16. Mutual synchronization takes place via a timing control circuit 15. After a sub-pixel has been excited, the ignition is maintained by the sustain pulses across the display electrodes within a pixel. Dependent on the grey tint to be displayed, these are offered more frequently or less frequently per pixel. The sustain frequency therefore determines, together with the grey tint, the number of times a UN photon impinges upon a phosphor.
Fig. 3 is a diagrammatic front-elevational view of a display device, particularly the location of a number of phosphors 8, 8', 8", 8'" with the colors red (R), green (GO, blue (B) and a second color green (G2). The broken line 25 diagrammatically represents a pixel.
The C.I.E. color triangle of Fig. 4 shows the luminances associated with these phosphors as B(Y0, R(Y2), G](Y3) and G2(Y4) (Y: luminance) in this color triangle.
Generally, it holds for display of a pixel x0, y0 with luminance Y0 by means of three phosphors
Y0= ∑ yi ι=l
in which
∑(x< -xo)(Yl/y,) = 0 ∑(χl - xo)(Y,/ y,) = 0 ι=l ι=l
In the embodiment of Fig. 4, the point Yo can be realized by weighted excitation of the phosphors B, R and Gi or by weighted excitation of the phosphors B, R and G2. At an equal efficiency of all phosphors, such a weighting is not necessary (and an extra phosphor G2 is in fact redundant). Since the efficiency of the green phosphor willemite (with color co-ordinates x = 0.25, y = 0.67) denoted by Gj in Fig. 4, rapidly deteriorates at higher frequencies, the presence of a second phosphor G2 provides the possibility of such a choice, notably when a non-saturating phosphor is chosen for G , for example, said CBT (with color co-ordinates x = 0.36, y = 0.54). The co-ordinates (x0, y0) are now found by means of the equations
ι=4 ,=4
T (x, - χ0) γ, i y.) = o Σ (y - y° (γ' ! y>) = °
, ι=l in which now in which simultaneously the efficiency
Yo ηo
1= f?< may be maximal. The choice between the combinations Y1; Y2, Y3 and Y], Y2, Y4 is now made by determining the maximal efficiency η0 by means of Y4 = 0, or η0 (Yi, y2, Y3), and by Y3 = 0, or η0 (Yi, Y2, Y ). The group of phosphors yielding the highest efficiency is then driven.
Similar calculations can be performed for points in the triangles, Y2, Y3, Y4 and
The choice between Y3 (GO and Y4 (G2) is made in the device of Fig. 2 by processing information about the color to be displayed, stored in the frame memory 12, in the processing unit 14. To this end, this unit comprises, for example, a microprocessor or a lookup table in which the behavior (notably the efficiency of the phosphors as a function of the frequency (grey scale to be displayed) is stored. Dependent on the above consideration, that phosphor is driven with which the desired color is obtained at the highest efficiency. To this end, the X and Y drivers are supplied with drive signals for the relevant sub-pixels. Figs. 5 to 7 show a number of variants in which the phosphors are distributed across sub-pixels in different ways.
In Fig. 7, a pixel 25 comprises three sub-pixels, the green sub-pixel comprising a phosphor layer Gm which consists of a mixture of willemite and CBT.
Although the above-described discrimination between two different phosphors cannot be made with drive signals, it appears that the mixture is less rapidly saturated so that a higher efficiency is achieved through a large part of the color triangle.
In Fig. 8, extra blue and red phosphors (B2, R2) are added, which are preferably non-saturating so that a good color adjustment goes together with a maximum efficiency. A completely different possibility is the use of a so-called white phosphor instead of G2 in Figs. 3, 5, 6.
The invention is of course not limited to the embodiments described hereinbefore. For example, the sub-pixels may have, for example, different surface areas, which may be incorporated in the data in the processing unit 14. The invention is also applicable to field emission display devices in which the efficiency of given phosphors is also dependent on the luminance to be adjusted. In summary, the invention relates to a luminescence-based color display device having at least one extra phosphor per pixel, in which, dependent on the color to be displayed and the luminance (brightness), the combination of sub-pixels to be driven is determined.
The invention relates to each and every novel characteristic feature and each and every combination of characteristic features.

Claims

CLAIMS:
1. A color display device comprising a first substrate provided with a layer of fluorescent material, and a second, transparent substrate, said color display device comprising means for addressing pixels during use, characterized in that the layer of fluorescent material comprises at least two different phosphors of substantially the same color at the location of a pixel.
2. A color display device as claimed in claim 1, characterized in that one of the two phosphors is a non-saturating phosphor.
3. A color display device as claimed in claim 1 or 2, characterized in that the layer of fluorescent material at the location of a pixel, viewed in a direction transverse to the first substrate, comprises at least two sub-pixels having different phosphors of substantially the same color for different sub-pixels.
4. A color display device as claimed in claim 3, characterized in that the display device comprises drive means for converting an incoming signal into at least two drive signals for separate sub-pixels.
5. A color display device as claimed in claim 4, characterized in that, dependent on the color to be displayed and the luminance of the pixel, the drive means determine the drive of the sub-pixels.
6. A color display device as claimed in claim 1 or 2, characterized in that the layer of fluorescent material comprises at least two different green phosphors.
7. A color display device as claimed in claim 1, characterized in that the layer of fluorescent material comprises a white phosphor.
8. A color display device as claimed in claim 1, characterized in that the first substrate is provided with address electrodes, and the second, transparent substrate is provided with at least two display electrodes having a gas discharge mixture between the two substrates.
PCT/EP2000/000213 1999-02-24 2000-01-10 Color display device WO2000051156A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1020007011742A KR20010071169A (en) 1999-02-24 2000-01-10 Color display device
DE60015244T DE60015244T2 (en) 1999-02-24 2000-01-10 COLOR DISPLAY DEVICE
JP2000601669A JP4776078B2 (en) 1999-02-24 2000-01-10 Color display device
EP20000904908 EP1074036B1 (en) 1999-02-24 2000-01-10 Color display device
KR1020077004712A KR100898190B1 (en) 1999-02-24 2000-01-10 Color display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP99200520 1999-02-24
EP99200520.7 1999-02-24

Publications (1)

Publication Number Publication Date
WO2000051156A1 true WO2000051156A1 (en) 2000-08-31

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Country Status (7)

Country Link
US (1) US6388644B1 (en)
EP (1) EP1074036B1 (en)
JP (1) JP4776078B2 (en)
KR (3) KR100898190B1 (en)
DE (1) DE60015244T2 (en)
TW (1) TW434628B (en)
WO (1) WO2000051156A1 (en)

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KR20070033480A (en) 2007-03-26
TW434628B (en) 2001-05-16
EP1074036A1 (en) 2001-02-07
EP1074036B1 (en) 2004-10-27
DE60015244D1 (en) 2004-12-02
JP2002538582A (en) 2002-11-12
KR20010071169A (en) 2001-07-28
JP4776078B2 (en) 2011-09-21
KR100898190B1 (en) 2009-05-18
US6388644B1 (en) 2002-05-14
KR20080021164A (en) 2008-03-06
KR100919959B1 (en) 2009-10-01

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