WO2006016300A1 - Color display device - Google Patents
Color display device Download PDFInfo
- Publication number
- WO2006016300A1 WO2006016300A1 PCT/IB2005/052486 IB2005052486W WO2006016300A1 WO 2006016300 A1 WO2006016300 A1 WO 2006016300A1 IB 2005052486 W IB2005052486 W IB 2005052486W WO 2006016300 A1 WO2006016300 A1 WO 2006016300A1
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- WO
- WIPO (PCT)
- Prior art keywords
- writing
- display device
- display
- electrode
- programmable
- Prior art date
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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
- G02F1/0126—Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass
Definitions
- a color display device of the type mentioned is described in SID 03 Digest 03, page 851 -A, "Photon-Mode Full-Color Rewritable Image Using Photochromic Compounds".
- Said document describes how images are obtained by irradiation of a sample element containing photochromic fulgides and polystyrene with visible light.
- a full color image is obtained in a sample by using a positive photographic color film as a photo-mask and then successively irradiating the sample with three fluorescent lamps (corresponding to blue, green and red). So the selectively applying of the three colors is of the spatially selective kind. To apply another color (or a completely new image) another positive photographic color image is needed, which is time consuming.
- a method of displaying an image according to the invention method comprises the steps of
- control element analyses the image content of the image for radiation of at least two different wavelength bands.
- Figure 1 schematically shows a part of a device in which the invention is used
- the photochromic materials of the photochromic layer 10 may be solved in toluene, deposited on film layer 9 and dried thereon. Instead of mixing fulgides three (or more) sublayers may be used, each having its own fulgide.
- the thickness of the photochromic layer 10 may vary and is in this example e.g. about 2 micrometer.
- FIG. 5 A very suitable writing device 5, which is based on a so-called “roll-blind” principle, is shown in Figures 5,6.
- Figures 5 and 6 schematically show a part of a writing device 5.
- a transparent substrate 32 is covered with transparent first electrodes 33 e.g. ITO - electrodes.
- the electrodes 33 are covered with a thin dielectric layer 34.
- a foil 36 which is covered with a conductive electrode part 35, forms together with said conductive electrode part 35 a second, reliable electrode.
- the thin dielectric layer 34 electrically isolates the electrodes 33 (e.g. parts of column electrodes) from the reliable electrode parts 35 (e.g. parts of column electrodes).
- Figure 5 shows three shutter elements 30, two of which are in an open, transparent state (reliable electrode 35, 36 rolled up to a first position), the other one being in a closed, opaque (black) state (reliable electrode 35, 36 unrolled to a second position).
- the elastic force is the force present in the reliable electrode 35, 36 and is the result of e.g. shrinkage during manufacturing and this force is directed at rolling up the reliable electrode 35,36 of a shutter element.
- the electrostatic force is the attractive force between the conductive electrode part 35 and the (ITO) on the substrate by applying a voltage.
- the "van der Waals” force is the force between the foil 36 and the substrate 32. This force depends on the distance between the two media, the roughness of the media and the material properties. The smaller the distance is, the larger the "van der Waals” force is.
- Figure 6 shows a cross-section schematic of a billboard or advertising screen 1, using such a "roll-blind” principle.
- the display surface 2 is provided on an endless belt 3 again.
- the programmable writing member 6 is provided with an array of programmable shutter elements 30, which are programmed to de open or closed, dependent on the information to be displayed on billboard 1.
- the shutter elements 30 are first programmed to pass the radiation necessary to activate the red-coloring fungides of the photochromic layer 10, after which one or more red lamps 41 supply a red radiation.
- the shutter elements 30 are programmed to pass the radiation necessary to activate the green-coloring fungides of the photocliromic layer 10, after which one or more green lamps 42 supply a green radiation, after which the shutter elements 30 are programmed to pass the radiation necessary to activate the blue-coloring fungides of the photochromic layer 10, after which one or more blue lamps 42 supply a blue radiation.
Abstract
A display device (1) comprises a display member having a display area with a photochromic layer (10), for displaying information and a writing member (5) for selectively applying radiation to the display member and an erasing member (12) for clearing information. The writing member is able to provide radiation of wavelength bands to the same part of the display area via programming (an area of) LEDs (8) or via shutter elements (30) based on the roll-blind principle .
Description
Color display device
The invention relates to a color display device comprising a display member having a display area, comprising at least one photochromic layer, for displaying information and a writing member for selectively applying radiation to the display member and an erasing member for clearing information. Such a color display device is used especially, bur not exclusively in large screen applications such as billboards and advertising screens, but the invention is also applicable to smaller screens.
The invention further relates to a method of displaying an image.
A color display device of the type mentioned is described in SID 03 Digest 03, page 851 -A, "Photon-Mode Full-Color Rewritable Image Using Photochromic Compounds". Said document describes how images are obtained by irradiation of a sample element containing photochromic fulgides and polystyrene with visible light. A full color image is obtained in a sample by using a positive photographic color film as a photo-mask and then successively irradiating the sample with three fluorescent lamps (corresponding to blue, green and red). So the selectively applying of the three colors is of the spatially selective kind. To apply another color (or a completely new image) another positive photographic color image is needed, which is time consuming. The present invention has as its objective to overcome said disadvantage. To this end a display device according to the invention has a writing member being able to provide radiation of at least two different wavelength bands to the same part of the display area. Preferably the writing members are programmable e.g. by providing them with an array of programmable LEDs or an array of programmable shutters and at least one radiation source.
By making the writing member programmable there is no need for exchanging positive photographic color images to rewrite a picture element. After erasing and programming the writing members radiation related to a certain picture is directed to a picture element. Color images are obtained in one embodiment by making the writing
member and the display member movable with respect to each other. A display element based on the use of a photochromic sheet having programmable LEDs and the display member movable with respect to the writing member is known per se from USP 4,857,908. However in said document the image in a photochromic sheet is obtained by radiation with one single kind of radiation (UV) and a color image is obtained by using a color filter on the photochromic sheet. So here again to obtain three colors spatially selective radiation (be it now with one kind of radiation) is used, leading to lower resolution and possible color smearing of neighboring (sub) picture elements.
In one embodiment the writing member has at least one writing line and the display member is movable in a direction making an angle with the writing line of programmable elements. Preferably this direction is substantially orthogonal to the writing line of programmable elements. Writing may be done continuously or sequentially depending on the speed of moving and the writing time of the photochromic material. In another, preferred embodiment the writing member comprises an array of programmable shutters and at least one radiation source (or an array of programmable LEDs). This offers the possibility to write a complete color picture either by providing colored picture (in the writing member) or by sequentially providing e.g. red green and blue sub- pictures. The contents of the image to be displayed can be offered externally via a wireless technique or may be generated internally by means of a control element for analyzing an image to be displayed, which control element analyses the image content of the image for radiation of the at least two different wavelengths.
A method of displaying an image according to the invention method comprises the steps of
1) clearing, if necessary, information of the display member
2) analyzing an image to be displayed, which control element analyses the image content of the image for radiation of at least two different wavelength bands.
3) writing information to the display area by selectively applying radiation of a first wavelength band based on information with respect to said first wavelength band
4) writing information to the display area by selectively applying radiation of at least one further wavelength band based on information with respect to said further wavelength band.
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
In the drawings: Figure 1 schematically shows a part of a device in which the invention is used,
Figure 2 shows a cross-section along the line II - II in Figure 1, Figure 3 shows a cross-section along the line II - II in Figure 1 of a device according to the invention,
Figure 4 shows a programmable writing member, provided with an array of programmable light sources, while
Figures 5 and 6 schematically show a part of a device according to the invention and
Figure 7 shows a part of a device in which the invention is used.
The Figures are diagrammatic and not to scale; corresponding components are generally denoted by the same reference numerals.
Figures 1, 2 show a schematic embodiment of a billboard or advertising screen 1, in which the invention is used. It includes a housing (not shown for a display surface 2, in this example provide on an endless belt 3, having driving roller 4. and a writing device 5 for writing information, which is to be discussed later. The moving direction of the endless belt 3 is indicated by arrow 6, but may be reversed if necessary.
Figure 3 shows a cross-section schematic of a billboard or advertising screen 1 according to the invention. The display surface 2 is provided on an endless belt 3 again and comprises a support or film layer 9, such as for example a white polyethylene terephtalate film (PET) or any other suitable substrate layer, provides with a photochromic layer 10.
Photochromic layer 10 may preferably be a layer of one or more photochromic layer having a mixture of colorants. For example it may consist of various photochromic fulgides, including for example a PyOF (providing a hue of yellow), a TF( providing a hue of magenta) and a PPF( providing a hue of cyan) and polystyrene, as mentioned in SID 03 Digest 03, page 851 -4, "Photon-Mode Full-Color Rewritable Image Using Photochromic Compounds" in which images are obtained by irradiation of a sample element containing photochromic fulgides and polystyrene with visible light. Preferably at least three different
fulgides are used. As indicated by reference numerals 3' the display surface 2 need not be provided on the endless belt 3 over its complete surface.
The photochromic materials of the photochromic layer 10 may be solved in toluene, deposited on film layer 9 and dried thereon. Instead of mixing fulgides three (or more) sublayers may be used, each having its own fulgide. The thickness of the photochromic layer 10 may vary and is in this example e.g. about 2 micrometer.
In this example a protective layer 11 is deposited over the photochromic layer 10, such as for instance poly(vinyl). In this example a programmable writing mcnibci 5 is provided with an array 16 of programmable LEDs 8. Alternatively an array of programmable shutters and at least one radiation source is used as the programmable writing member 5.
By making the writing member programmable there is no need for exchanging positive photographic color images to rewrite a picture element. Before rewriting information is erased by an erasing member 12, such as an UV- radiation source. Erasing member 12 in this example is part of the programmable writing member 5. The programmable writing member 5 is provided with an array of programmable light sources (LEDs 8 in Figure 3), which are e.g. organized as one or more writing lines of any of a variety of colors (e.g. blue, red , green etcetera). For example as shown in Figure 4 writing lines 22 may comprise one or more light emitting diode arrays. Writing lines 22 can each have one or more (sub) pixels of the same, or at least substantially the same color, arranged to form a line of a particular color. Thus, each writing line 22 preferably may provide a different color effect from directly adjacent writing lines 22. Writing lines 22 and/or (sub) pixels 24 may be of any shape, size and configuration appropriate to effectively write information into display member 10. The erasing member 12 may cooperate with writing lines 22 to modify, refresh and/or otherwise change information provide by the display surface 2.
The display member and erasing member 12 are preferably movable with respect to each other so that image information may be written to the photochromic layer 10 and/or erased as desired. Preferably one or more writing lines 22 are oriented orthogonal with respect to a moving direction as indicated by arrow 6 in Figure 1. In another embodiment the writing device 5 has substantially the same area as the display area and these areas coincide for instance at a back side of the endless belt 3.
A very suitable writing device 5, which is based on a so-called "roll-blind" principle, is shown in Figures 5,6. Figures 5 and 6 schematically show a part of a writing device 5. A transparent substrate 32 is covered with transparent first electrodes 33 e.g. ITO -
electrodes. The electrodes 33 are covered with a thin dielectric layer 34. A foil 36, which is covered with a conductive electrode part 35, forms together with said conductive electrode part 35 a second, reliable electrode. The thin dielectric layer 34 electrically isolates the electrodes 33 (e.g. parts of column electrodes) from the reliable electrode parts 35 (e.g. parts of column electrodes). Figure 5 shows three shutter elements 30, two of which are in an open, transparent state (reliable electrode 35, 36 rolled up to a first position), the other one being in a closed, opaque (black) state (reliable electrode 35, 36 unrolled to a second position).
In this example the foil 36 is glued to the dielectric layer 34 on one edge part 37 of every shutter element. The reliable electrodes 35, 36 are switchable between a transrnissive (open) state and an opaque (closed) state, e.g. by choosing aluminum for the electrode parts 35. The device 5 further comprises e.g. driving means and for example a backlighting system.
It is assumed that in the device 5 three (or four) forces determine the switching behavior, an elastic force, an electrostatic force, and the "van der Waals" force and to a minor extend the gravitational force. The elastic force is the force present in the reliable electrode 35, 36 and is the result of e.g. shrinkage during manufacturing and this force is directed at rolling up the reliable electrode 35,36 of a shutter element. The electrostatic force is the attractive force between the conductive electrode part 35 and the (ITO) on the substrate by applying a voltage. The "van der Waals" force is the force between the foil 36 and the substrate 32. This force depends on the distance between the two media, the roughness of the media and the material properties. The smaller the distance is, the larger the "van der Waals" force is. The electrostatic force depends strongly on the distance, the surface area, dielectric constant of the materials and the voltage difference between the foil and the substrate. The gravitational force acts upon the rolled up electrode 35, 36 which also depends on the orientation of this foil. It is very thin and has therefore a very low mass, so it is probably negligible.
The elastic force is directed at rolling up the reliable electrode 35, 36 , while the electrostatic force and the "van der Waals" force are directed at keeping the reliable electrode 35, 36 closed. To keep a shutter element open (the left two elements in Figures 5,6) the elastic force must be larger than the "van der Waals" force, since the shutter element in the device 1 is open if no or little electrostatic force is present. When a shutter element is closed, the "van der Waals" force and the electrostatic force keep it closed, whereas the elastic force wants to open it.
If no voltage is applied the Tollable electrode 35, 36 is in a rolled up state, giving an open element. When applying a certain voltage, in matrix devices between the column voltages and the row voltages, the electrostatic forces rolls down the reliable electrode 35, 36 on to the substrate 32, covering the shutter area and creating a closed shutter element.
Figure 6 shows a cross-section schematic of a billboard or advertising screen 1, using such a "roll-blind" principle. The display surface 2 is provided on an endless belt 3 again. The programmable writing member 6 is provided with an array of programmable shutter elements 30, which are programmed to de open or closed, dependent on the information to be displayed on billboard 1. In this particular embodiment the shutter elements 30 are first programmed to pass the radiation necessary to activate the red-coloring fungides of the photochromic layer 10, after which one or more red lamps 41 supply a red radiation. Then the shutter elements 30 are programmed to pass the radiation necessary to activate the green-coloring fungides of the photocliromic layer 10, after which one or more green lamps 42 supply a green radiation, after which the shutter elements 30 are programmed to pass the radiation necessary to activate the blue-coloring fungides of the photochromic layer 10, after which one or more blue lamps 42 supply a blue radiation.
The invention is not restricted to the embodiments shown. For instance in Figure 7 one or more lines of shutter elements 30 suffice, whereas more than three color- components may be used to enhance color-quality.
The invention resides in each and every novel characteristic feature and each and every combination of features. Reference numerals in the claims do not limit the protective scope of these claims. The use of the verb "to comprise" and its conjugations does not exclude the presence of elements other than those stated in the claims. The use of the article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
Claims
1. A display device (1) comprising a display member having a display area, comprising at least one photochromic layer (10), for displaying information and a writing member (5) for selectively applying radiation to the display member and an erasing member (12) for clearing information, the writing member being able to provide radiation of at least two different wavelength bands to the same part of the display area.
2. A display device according to Claim 1 in which the writing member and the display member are movable with respect to each other.
3. A display device according to Claim 1 or Claim 2 in which the display member has photochromic layers overlying each other.
4. A display device according to Claim 1 or Claim 2 in which the display member comprises a mixture of photochromic materials.
5. A display device according to Claim 1 or Claim 2 in which the writing member comprises at least one writing line of programmable elements (8,30).
6. A display device according to Claim 1 or Claim 2 in which the writing member comprises at least one line of programmable LEDs (8).
7. A display device according to Claim 1 or Claim 2 in which the writing member comprises at least one line of programmable shutter elements (30) and at least one radiation source (41,42,43).
8. A display device according to Claim 7 in which a programmable shutter element (30) comprises on a substrate (32), a first electrode (33), a dielectric layer (34) between said first electrode and a second electrode (35,36), the second electrode being movable in response to an electric field between a first position corresponding to an edge region (37) of the shutter element and a second position in which the second electrode at least partly covers the further surface region of the shutter element.
9. A display device according to Claim 7 in which the writing member (5) comprises at least two sequential radiation sources (41,42,43).
10. A display device according to Claim 5 in which the writing member and the display member are movable in a direction making an angle with the writing line of programmable elements.
11. A display device according to Claim 5 in which the writing member and the display member are movable in a direction substantially orthogonal to the writing line of programmable elements.
12. A display device according to Claim 5 in which the display member is writable while moving the writing member and the display member with respect to each other.
13. A display device according to Claim 1 or Claim 2 in which the writing member comprises an array of programmable elements (8,30).
14. A display device according to Claim 1 or Claim 2 in which the writing member comprises an array of programmable LEDs (8).
15. A display device according to Claim 1 or Claim 2 in which the writing member comprises an array of programmable shutter elements (30) and at least one radiation source (41,42,43).
16. A display device according to Claim 15 in which a programmable shutter element (30) comprises on a substrate (32), a first electrode (33), a dielectric layer (34) between said first electrode and a second electrode (35,36), the second electrode being movable in response to an electric field between a first position corresponding to an edge region (37) of the shutter element and a second position in which the second electrode at least partly covers the further surface region of the shutter.
17. A display device according to Claim 15 in which the writing member comprises at least two sequential radiation sources (41,42,43).
18. A display device according to Claim 1 or Claim 2, the device further comprising a control element for analyzing an image to be displayed, which control element analyses the image content of the image for radiation of the at least two different wavelengths.
19. A method for displaying information on a display member having a display area and comprising at least one photochromic layer (10), the method comprising the steps of
1) clearing, if necessary, information of the display member
2) analyzing an image to be displayed, which control element analyses the image content of the image for radiation of at least two different wavelength bands. 3) writing information to the display area by selectively applying radiation of a first wavelength band based on information with respect to said first wavelength band
4) writing information to the display area by selectively applying radiation of at least one further wavelength band based on information with respect to said further wavelength band.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04103845 | 2004-08-10 | ||
| EP04103845.6 | 2004-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006016300A1 true WO2006016300A1 (en) | 2006-02-16 |
Family
ID=35058304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2005/052486 WO2006016300A1 (en) | 2004-08-10 | 2005-07-25 | Color display device |
Country Status (2)
| Country | Link |
|---|---|
| TW (1) | TW200617870A (en) |
| WO (1) | WO2006016300A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4148711A1 (en) * | 2021-09-14 | 2023-03-15 | Freshape SA | Photon and/or photoelectron driven full-colour reflective passive screen |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4857908A (en) * | 1986-01-31 | 1989-08-15 | Ricoh Company, Ltd. | Wide screen display device using an endless belt |
| US5075796A (en) * | 1990-05-31 | 1991-12-24 | Eastman Kodak Company | Optical article for multicolor imaging |
| JP2000071518A (en) * | 1998-09-01 | 2000-03-07 | Minolta Co Ltd | Optical recording apparatus |
| JP2000313142A (en) * | 1999-04-28 | 2000-11-14 | Fuji Photo Film Co Ltd | Reflection liquid crystal printer |
| JP2003222971A (en) * | 2001-11-20 | 2003-08-08 | Ricoh Co Ltd | Method for displaying multicolor image, and multicolor image display |
| JP2003233153A (en) * | 2002-02-08 | 2003-08-22 | Ricoh Co Ltd | Multicolor image forming apparatus |
-
2005
- 2005-07-25 WO PCT/IB2005/052486 patent/WO2006016300A1/en active Application Filing
- 2005-08-08 TW TW094126852A patent/TW200617870A/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4857908A (en) * | 1986-01-31 | 1989-08-15 | Ricoh Company, Ltd. | Wide screen display device using an endless belt |
| US5075796A (en) * | 1990-05-31 | 1991-12-24 | Eastman Kodak Company | Optical article for multicolor imaging |
| JP2000071518A (en) * | 1998-09-01 | 2000-03-07 | Minolta Co Ltd | Optical recording apparatus |
| JP2000313142A (en) * | 1999-04-28 | 2000-11-14 | Fuji Photo Film Co Ltd | Reflection liquid crystal printer |
| JP2003222971A (en) * | 2001-11-20 | 2003-08-08 | Ricoh Co Ltd | Method for displaying multicolor image, and multicolor image display |
| JP2003233153A (en) * | 2002-02-08 | 2003-08-22 | Ricoh Co Ltd | Multicolor image forming apparatus |
Non-Patent Citations (4)
| Title |
|---|
| KAWASHIMA I ET AL: "20.4: Photon-Mode Full-Color Rewritable Image Using Photochromic Compounds", SID INTERNATIONAL SYMPOSIUM DIGEST OF TECHNICAL PAPERS, vol. XXXIV, 2003 - 2003, pages 851 - 853, XP007008255 * |
| PATENT ABSTRACTS OF JAPAN vol. 2000, no. 06 22 September 2000 (2000-09-22) * |
| PATENT ABSTRACTS OF JAPAN vol. 2000, no. 14 5 March 2001 (2001-03-05) * |
| PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4148711A1 (en) * | 2021-09-14 | 2023-03-15 | Freshape SA | Photon and/or photoelectron driven full-colour reflective passive screen |
| WO2023041496A1 (en) * | 2021-09-14 | 2023-03-23 | Freshape Sa | Photon and/or photoelectron driven full-colour reflective passive screen |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200617870A (en) | 2006-06-01 |
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