GB2281542A - Automotive instrumentation display with deadfront colour filter - Google Patents
Automotive instrumentation display with deadfront colour filter Download PDFInfo
- Publication number
- GB2281542A GB2281542A GB9415761A GB9415761A GB2281542A GB 2281542 A GB2281542 A GB 2281542A GB 9415761 A GB9415761 A GB 9415761A GB 9415761 A GB9415761 A GB 9415761A GB 2281542 A GB2281542 A GB 2281542A
- Authority
- GB
- United Kingdom
- Prior art keywords
- deadfront
- light emissions
- colour filter
- wavelengths
- display
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/28—Structurally-combined illuminating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
- B60Q3/10—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards
- B60Q3/16—Circuits; Control arrangements
- B60Q3/18—Circuits; Control arrangements for varying the light intensity
Description
1 2281542 1 - WAVELENGTH TUNED COLOUR FILTER This invention relates to
automotive instrumentation displays- More particularly, this invention relates to so- called I'deadfront11 instrumentation displays which appear entirely dark when the instrumentation display is deactivated.
Typical deadfront instrumentation displays employ a smoke colour or neutral density colour filter disposed between an illuminated display area and the observer. Such smoke colour or neutral density colour filters have, as one characteristic, a significant attenuation of light flux, on the order of 8096 to 90%, at all visible light wavelengths. Because this light attenuation affects all visible wavelengths, it is necessary to use a relatively bright illumination source in order to produce a desired display image visible to the vehicle driver. It would be advantageous to provide a deadfront instrumentation display with a reduced illumination brightness requirement.
In addition, despite the high attenuation of the smoke colour or neutral density colour filter, some ambient light incident upon the filter is likely to pass through and fall upon the display, obliterating or reducing the contrast of the intended display image. It would, therefore, be advantageous to provide a deadfront instrumentation display that reduces the deleterious effect of ambient light flux upon the intended display.
It is known, for example as disclosed in United States Patent No. 4,582, 394, that holographic means disposed in the light path between a display and the observer may be used to reflect light emissions of one or more unwanted visible wavelengths away from the observer while permitting desired light emissions outside of such reflection wavelength peaks to pass through to the observer. However, such holographic means typically suffer from low off-axis visibility and relatively high cost.
2 Accordingly, a need has remained for a lower cost means of providing a deadfront instrumentation display capable of displaying a desired image without the need for a relatively bright display illumination source.
Automotive-instrumentation displays according to the present invention comprise an illuminated display area and a deadfront colour filter disposed between the illuminated display area and the observer.
In a principal aspect, the invention comprises a deadfront colour filter tuned to the wavelength of one or more selected narrow band light emissions. A deadfront colour filter of the present invention passes the selected narrow band light emissions with low attenuation, but significantly attenuates emissions of most other visible wavelengths incident upon the filter. The resulting effect is as though the tuned filter has attenuation "holes" at the emission wavelengths of the illumination source.
The display embodying, the present invention allows intended light to pass through a deadfront instrumentation display with low attenuation, while preventing significant 7lux f amounts of incident ambient light f Erom entering unintended regions of the display and thereby spoiling the desired deadfront appearance. Although some ambient light may pass through the deadfront instrumentation display, the reflection of most such ambient light is further attenuated as it passes back through the colour filter toward the observer, while the light emissions of the intended display pass through the colour filter with less attenuation.
Further the deadfront automotive instrumentation display embodying the present invention, due to the reduced attenuation of the component wavelengths of the display illumination source, requires less light from the illumination source to create a desired display effect than is required by a conventional deadfront display system.
In yet another aspect, the present invention provides a means of obtaining the foregoing advantages using readily commercially available components, permitting construction of preferred embodiments of the invention at a relatively low cost.
In one preferred embodiment, the present invention consists of a dyed colour filter comprising a flat or curved surface of plastic or glass typically 2 to 5 mm thick and typically extending over most of the instrumentation display surface. The filter material includes various colour dyes necessary to provide the desired optical properties. Such materials are commercially available.
A particularly preferred embodiment of the invention employs an instrument display illumination source having a number, most preferably three, of narrow band light emissions. The colours of the narrow band light emissions are selected to produce a desired visual effect. For example, selected narrow band light emissions in the red, green and blue regions can be combined to produce a desired illumination pattern of white light. A deadfront colour filter lens of the present invention may be adapted to provide reduced attenuation of light emissions within wave bands approximately equal to the narrow band light emissions of the instrument display illumination source.
An additional balancing filter may be necessary over some portion or all of the display in order to achieve the desired colour output. For example, when using a colour filter tuned to allow the emission of red light from gauge pointers with less attenuation than other light in the system, a blue balancing filter placed over graphics which are desired to appear white will transform their colour from amber to white.
The invention will now be described further, by way of example, with reference to the accompanying drawings, in which:
Fig. 1 illustrates the light flux attenuation characteristics of a preferred embodiment of a deadfront colour filter according to the present invention.
4 Fig. 2 is a spectral plot of a typical fluorescent lamp preferred in the practice of the present invention.
Fig. 3 illustrates the spectral transmission of a deadfront colour filter material preferred in the practice of the invention.
Preferred automotive instrumentation displays of the present invention are made by tuning a deadfront colour filter material to the light emission pattern of a selected display illumination source. Light emissions from a display illumination source comprising an intended display image pass through a deadfront colour filter to the observer. Unwanted light emissions, such as ambient sunlight, are highly attenuated by the deadfront colour filter.
is As depicted in Fig. 1, an advantageous feature of deadfront colour filters of the present invention is their selective transmission of visible light emissions at particular wavelengths and high attenuation of most other wavelengths of visible light. Fig. 1 illustrates a deadfront colour filter that selectively transmits light emissions within pass bands of approximately 410-450 nm, 520-560 nm and 590-630 nm. Light emissions of wavelengths outside these selected pass band ranges are highly attenuated.
Referring now to Fig. 2, a spectral plot of a typical commercially available fluorescent lamp (Harrison Electric Co., Type 9WE) reveals three main narrow band visible light emissions, each approximately 20 nanometres wide, at approximately 430 nanometres, 540 nanometres, and 605 nanometres in the visible region of the electromagnetic spectrum. The sum of these three narrow band emissions appears to the human eye as blue- white light.
Preferred deadfront colour filters of the present invent-ion comprise a flat or curved surface of plastic or glass typically 2 millimetres to 5 millimetres thick, and most preferably 2.1 millimetres to 2.6 millimetres thick, typically extending over most or all of the instrumentation display surface. Preferred materials for practising the invention include (but are not limited to) dyed plastics, such as plexiglas, acrylic, polycarbonate or Kamax (polyaliphatic imide copolymer, available from Rohm Haas Co., Philadelphia, PA). Such dyed plastics are commercially available and may be manufactured, using known techniques, to desired configurations as part of an automotive instrument panel and to particular spectral transmission specifications, such as those described herein. The filter may also be a multi-layer assembly, a multi section assembly, and/or may have surface coatings of metals or non metals.
To provide a desired deadfront appearance, the deadfront colour filter should most preferably appear black when viewed in ambient light, but because attainment of such a black appearance is difficult without some sacrifice of the desired optical properties and/or cost advantages of the disclosed embodiments, colour filters of dark brown and dark red colours may also be advantageously employed in the practice of the invention. The deadfront colour filter should attenuate visible light emissions of wavelengths outside the selected pass bands by at least 90 percent.
One especially preferred material for use in deadfront colour filters of the present invention is AtoHaas #71010 (dyed polymethylmethacrylate (pMMA), available commercially from Rohm & Haas). Referring now to Fig. 3, the spectral plot of light transmitted through a colour filter 'of AtoHaas #71010 reveals reduced attenuation of light within pass bands of approximately 400-415 nm, 570- 590 nm and 610-630 nm.
Preferably, the deadfront colour filter transmits at least 10 percent of the light emissions at wavelengths within the selected pass bands. Where it is desired that a display image, or part of a display image, appear red, the deadfront colour filter preferably further selectively transmits light emissions of wavelengths of approximately 630-660 nm.
A colour filter according to the present invention will be more effective if the selected pass bands are slightly narrower than the narrow band emissions of the display illumination source;.however, this also results in low off-axis light intensity, and is not feasible with low cost dyed filter lenses. Accordingly, pass bands of approximately the same width as the narrow band emissions of the illumination source are most preferred when dyed plastic filter lenses are used in practising the invention.
Although ambient light, such as sunlight, may include emissions having the same wavelengths as the selected narrow band light emissions, and thus will also have reduced attenuation at the selected pass bands, most of the ambient light flux, consisting of other wavelengths, will be highly attenuated. Accordingly, a desired deadfront appearance can be maintained.
1
Claims (14)
1. An automotive instrumentation display comprising:
(A) an illumination source having one or more narrow band visible light emissions; and, (B) a deadfront colour'filter having pass bands tuned to the wavelength of one or more of the narrow band visible light emissions of the said illumination source such that light emissions of wavelengths other than those of the said one or more narrow band light emissions of the said illumination source are more attenuated by the said deadfront colour filter than light emissions of wavelengths corresponding to the said narrow band visible is light emissions.
2. An automotive instrumentation display as claimed in Claim 1, wherein said illumination source comprises three narrow band light emissions.
3. An automotive instrumentation display as claimed in Claim 1, wherein said illumination source comprises narrow band visible light emissions at approximately 430 nm, 540 nm and 605 nm.
4. An automotive instrumentation display as claimed in Claim 1, wherein the said deadfront colour filter comprises acrylic, Kamax, polyearbonate, plexiglas or polymethylmethacrylate dyed (AToHaas #71010).
5. An automotive instrumentation display as claimed in Claim 1, wherein the said deadfront colour filter has a thickness of 2 millimetres to 5 millimetres.
6 An automotive instrumentation display as claimed in Claim 1, wherein the said deadfront colour filter has a thickness of 2. 1 millimetres to 2.6 millimetres.
7. An automotive instrumentation display as claimed in Claim 1, wherein the said deadfront colour filter is adapted to selectively transmit light emissions having wavelengths of approximately 410-450 nm, 520-560 nm and 590- 630 nm.
8. An automotive instrumentation display as claimed in Claim 1, wherein the said deadfront colour filter is adapted to selectively transmit light emissions having wavelengths of approximately 630-660 nm.
9. An automotive instrumentation display as claimed in Claim 1, wherein the said deadfront colour filter appears dark red or dark brown when the said illumination source is de-activated.
10. An automotive instrumentation display as claimed in Claim 1, wherein the attenuation by the said deadfront colour filter of visible light emissions of wavelengths other than those of the said one or more narrow band light - least 90 emissions of the said illumination source is at percent.
11. An automotive instrumentation display comprising:
(A) an illumination source; and, (B) a deadfront colour filter adapted to attenuate the passage of visible light emissions and tuned to the wavelengths of one or more selected light emission pass bands such that light emissions having wavelengths outside of the selected light emission pass bands are more highly attenuated than light emissions from the illumination source having wavelengths within the selected light emission pass bands.
12. A method for displaying an illuminated display image to an observer comprising disposing, between said illuminated display image and said observer, a deadfront v colour filter adapted to attenuate the passage of visible light emissions and having one or more selected light emission pass bands such that light emissions having wavelengths outside of the selected light emission pass bands are more highly attenuated than light emissions from the illumination source having wavelengths within the selected light emission pass bands.
13. An automotive transmission display substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
14. A method for displaying an illuminated display image substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11758693A | 1993-09-07 | 1993-09-07 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9415761D0 GB9415761D0 (en) | 1994-09-28 |
| GB2281542A true GB2281542A (en) | 1995-03-08 |
| GB2281542B GB2281542B (en) | 1997-04-30 |
Family
ID=22373721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9415761A Expired - Fee Related GB2281542B (en) | 1993-09-07 | 1994-08-04 | Wavelength tuned colour filter |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH07174590A (en) |
| DE (1) | DE4426344C2 (en) |
| GB (1) | GB2281542B (en) |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2743534A1 (en) * | 1996-01-12 | 1997-07-18 | Magneti Marelli France | Vehicle dashboard |
| FR2750935A1 (en) * | 1996-07-09 | 1998-01-16 | Magneti Marelli France | Motor vehicle dashboard with improved lighting and control of appearance |
| DE19732390A1 (en) * | 1997-07-25 | 1999-02-11 | Papst Motoren Gmbh & Co Kg | Lighting device for dashboard instruments, especially on motor vehicles |
| WO2019055581A1 (en) * | 2017-09-12 | 2019-03-21 | Corning Incorporated | Tactile elements for deadfronted glass and methods of making the same |
| WO2019241013A1 (en) * | 2018-06-12 | 2019-12-19 | Corning Incorporated | Deadfront for displays having a metal layer with a network of cracks formed throughout |
| WO2020014064A1 (en) * | 2018-07-12 | 2020-01-16 | Corning Incorporated | Deadfront configured for color matching |
| WO2020146185A1 (en) * | 2019-01-07 | 2020-07-16 | Corning Incorporated | Automotive interior comprising deadfront configured for color matching |
| US11292343B2 (en) | 2016-07-05 | 2022-04-05 | Corning Incorporated | Cold-formed glass article and assembly process thereof |
| US11332011B2 (en) | 2017-07-18 | 2022-05-17 | Corning Incorporated | Cold forming of complexly curved glass articles |
| US11331886B2 (en) | 2016-06-28 | 2022-05-17 | Corning Incorporated | Laminating thin strengthened glass to curved molded plastic surface for decorative and display cover application |
| US11384001B2 (en) | 2016-10-25 | 2022-07-12 | Corning Incorporated | Cold-form glass lamination to a display |
| US11518146B2 (en) | 2018-07-16 | 2022-12-06 | Corning Incorporated | Method of forming a vehicle interior system |
| US11550148B2 (en) | 2017-11-30 | 2023-01-10 | Corning Incorporated | Vacuum mold apparatus, systems, and methods for forming curved mirrors |
| US11586306B2 (en) | 2017-01-03 | 2023-02-21 | Corning Incorporated | Vehicle interior systems having a curved cover glass and display or touch panel and methods for forming the same |
| US11597672B2 (en) | 2016-03-09 | 2023-03-07 | Corning Incorporated | Cold forming of complexly curved glass articles |
| US11660963B2 (en) | 2017-09-13 | 2023-05-30 | Corning Incorporated | Curved vehicle displays |
| US11681173B2 (en) | 2020-04-03 | 2023-06-20 | Corning Incorporated | Image panel having composite image using color changing with backlight illumination |
| US11685685B2 (en) | 2019-07-31 | 2023-06-27 | Corning Incorporated | Method and system for cold-forming glass |
| US11685684B2 (en) | 2017-05-15 | 2023-06-27 | Corning Incorporated | Contoured glass articles and methods of making the same |
| US11718071B2 (en) | 2018-03-13 | 2023-08-08 | Corning Incorporated | Vehicle interior systems having a crack resistant curved cover glass and methods for forming the same |
| US11745588B2 (en) | 2017-10-10 | 2023-09-05 | Corning Incorporated | Vehicle interior systems having a curved cover glass with improved reliability and methods for forming the same |
| US11767250B2 (en) | 2017-11-30 | 2023-09-26 | Corning Incorporated | Systems and methods for vacuum-forming aspheric mirrors |
| US11768369B2 (en) | 2017-11-21 | 2023-09-26 | Corning Incorporated | Aspheric mirror for head-up display system and methods for forming the same |
| US11772491B2 (en) | 2017-09-13 | 2023-10-03 | Corning Incorporated | Light guide-based deadfront for display, related methods and vehicle interior systems |
| US11772361B2 (en) | 2020-04-02 | 2023-10-03 | Corning Incorporated | Curved glass constructions and methods for forming same |
| US11899865B2 (en) | 2017-01-03 | 2024-02-13 | Corning Incorporated | Vehicle interior systems having a curved cover glass and a display or touch panel and methods for forming the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2760414B1 (en) * | 1997-03-06 | 1999-10-22 | Magneti Marelli France | DASHBOARD FOR MOTOR VEHICLES INCLUDING AN EXTERNAL WINDOW WITH A DIAL |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4788629A (en) * | 1986-10-29 | 1988-11-29 | Loctite Luminescent Systems, Inc. | Instrument panel members |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB570791A (en) * | 1944-02-22 | 1945-07-23 | Electronic Lab Inc | Improvements in or relating to lamp structures |
| GB2203883B (en) * | 1987-04-16 | 1990-07-18 | Yazaki Corp | Display apparatus for automotive vehicle |
| US5128659A (en) * | 1988-02-16 | 1992-07-07 | K. W. Muth Company, Inc. | Instrument display apparatus |
| JPH03114433U (en) * | 1990-03-09 | 1991-11-25 | ||
| JP2543557Y2 (en) * | 1992-02-28 | 1997-08-06 | 矢崎総業株式会社 | Display device for vehicles |
-
1994
- 1994-07-25 DE DE4426344A patent/DE4426344C2/en not_active Expired - Fee Related
- 1994-08-04 GB GB9415761A patent/GB2281542B/en not_active Expired - Fee Related
- 1994-09-06 JP JP6212976A patent/JPH07174590A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4788629A (en) * | 1986-10-29 | 1988-11-29 | Loctite Luminescent Systems, Inc. | Instrument panel members |
Cited By (35)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2743534A1 (en) * | 1996-01-12 | 1997-07-18 | Magneti Marelli France | Vehicle dashboard |
| FR2750935A1 (en) * | 1996-07-09 | 1998-01-16 | Magneti Marelli France | Motor vehicle dashboard with improved lighting and control of appearance |
| DE19732390A1 (en) * | 1997-07-25 | 1999-02-11 | Papst Motoren Gmbh & Co Kg | Lighting device for dashboard instruments, especially on motor vehicles |
| US6213613B1 (en) | 1997-07-25 | 2001-04-10 | Papst Licensing Gmbh & Co. Kg | Illumination apparatus for instrument panels especially of motor vehicles |
| US11597672B2 (en) | 2016-03-09 | 2023-03-07 | Corning Incorporated | Cold forming of complexly curved glass articles |
| US11338556B2 (en) | 2016-06-28 | 2022-05-24 | Corning Incorporated | Laminating thin strengthened glass to curved molded plastic surface for decorative and display cover application |
| US11331886B2 (en) | 2016-06-28 | 2022-05-17 | Corning Incorporated | Laminating thin strengthened glass to curved molded plastic surface for decorative and display cover application |
| US11292343B2 (en) | 2016-07-05 | 2022-04-05 | Corning Incorporated | Cold-formed glass article and assembly process thereof |
| US11850942B2 (en) | 2016-07-05 | 2023-12-26 | Corning Incorporated | Cold-formed glass article and assembly process thereof |
| US11607958B2 (en) | 2016-07-05 | 2023-03-21 | Corning Incorporated | Cold-formed glass article and assembly process thereof |
| US11384001B2 (en) | 2016-10-25 | 2022-07-12 | Corning Incorporated | Cold-form glass lamination to a display |
| US11586306B2 (en) | 2017-01-03 | 2023-02-21 | Corning Incorporated | Vehicle interior systems having a curved cover glass and display or touch panel and methods for forming the same |
| US11899865B2 (en) | 2017-01-03 | 2024-02-13 | Corning Incorporated | Vehicle interior systems having a curved cover glass and a display or touch panel and methods for forming the same |
| US11685684B2 (en) | 2017-05-15 | 2023-06-27 | Corning Incorporated | Contoured glass articles and methods of making the same |
| US11332011B2 (en) | 2017-07-18 | 2022-05-17 | Corning Incorporated | Cold forming of complexly curved glass articles |
| WO2019055469A1 (en) * | 2017-09-12 | 2019-03-21 | Corning Incorporated | Deadfront for displays including a touch panel on decorative glass and related methods |
| US11459268B2 (en) | 2017-09-12 | 2022-10-04 | Corning Incorporated | Tactile elements for deadfronted glass and methods of making the same |
| TWI776952B (en) * | 2017-09-12 | 2022-09-11 | 美商康寧公司 | Deadfront for displays including a touch panel on decorative glass and related methods |
| US11713276B2 (en) | 2017-09-12 | 2023-08-01 | Corning Incorporated | Tactile elements for deadfronted glass and methods of making the same |
| WO2019055581A1 (en) * | 2017-09-12 | 2019-03-21 | Corning Incorporated | Tactile elements for deadfronted glass and methods of making the same |
| US11660963B2 (en) | 2017-09-13 | 2023-05-30 | Corning Incorporated | Curved vehicle displays |
| US11772491B2 (en) | 2017-09-13 | 2023-10-03 | Corning Incorporated | Light guide-based deadfront for display, related methods and vehicle interior systems |
| US11919396B2 (en) | 2017-09-13 | 2024-03-05 | Corning Incorporated | Curved vehicle displays |
| US11745588B2 (en) | 2017-10-10 | 2023-09-05 | Corning Incorporated | Vehicle interior systems having a curved cover glass with improved reliability and methods for forming the same |
| US11768369B2 (en) | 2017-11-21 | 2023-09-26 | Corning Incorporated | Aspheric mirror for head-up display system and methods for forming the same |
| US11550148B2 (en) | 2017-11-30 | 2023-01-10 | Corning Incorporated | Vacuum mold apparatus, systems, and methods for forming curved mirrors |
| US11767250B2 (en) | 2017-11-30 | 2023-09-26 | Corning Incorporated | Systems and methods for vacuum-forming aspheric mirrors |
| US11718071B2 (en) | 2018-03-13 | 2023-08-08 | Corning Incorporated | Vehicle interior systems having a crack resistant curved cover glass and methods for forming the same |
| WO2019241013A1 (en) * | 2018-06-12 | 2019-12-19 | Corning Incorporated | Deadfront for displays having a metal layer with a network of cracks formed throughout |
| WO2020014064A1 (en) * | 2018-07-12 | 2020-01-16 | Corning Incorporated | Deadfront configured for color matching |
| US11518146B2 (en) | 2018-07-16 | 2022-12-06 | Corning Incorporated | Method of forming a vehicle interior system |
| WO2020146185A1 (en) * | 2019-01-07 | 2020-07-16 | Corning Incorporated | Automotive interior comprising deadfront configured for color matching |
| US11685685B2 (en) | 2019-07-31 | 2023-06-27 | Corning Incorporated | Method and system for cold-forming glass |
| US11772361B2 (en) | 2020-04-02 | 2023-10-03 | Corning Incorporated | Curved glass constructions and methods for forming same |
| US11681173B2 (en) | 2020-04-03 | 2023-06-20 | Corning Incorporated | Image panel having composite image using color changing with backlight illumination |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2281542B (en) | 1997-04-30 |
| GB9415761D0 (en) | 1994-09-28 |
| DE4426344C2 (en) | 1998-02-26 |
| JPH07174590A (en) | 1995-07-14 |
| DE4426344A1 (en) | 1995-03-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20030804 |