GB1561623A – Device for displaying alphanumerical characters
– Google Patents
GB1561623A – Device for displaying alphanumerical characters
– Google Patents
Device for displaying alphanumerical characters
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Info
Publication number
GB1561623A
GB1561623A
GB1809/78A
GB180978A
GB1561623A
GB 1561623 A
GB1561623 A
GB 1561623A
GB 1809/78 A
GB1809/78 A
GB 1809/78A
GB 180978 A
GB180978 A
GB 180978A
GB 1561623 A
GB1561623 A
GB 1561623A
Authority
GB
United Kingdom
Prior art keywords
block
cavities
insulating material
thermoplastics material
epoxy resin
Prior art date
1977-01-20
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.)
Expired
Application number
GB1809/78A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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.)
1977-01-20
Filing date
1978-01-17
Publication date
1980-02-27
1978-01-17
Application filed by Philips Gloeilampenfabrieken NV
filed
Critical
Philips Gloeilampenfabrieken NV
1980-02-27
Publication of GB1561623A
publication
Critical
patent/GB1561623A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
G—PHYSICS
G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
G09F9/3023—Segmented electronic displays
H—ELECTRICITY
H01—ELECTRIC ELEMENTS
H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, «first-level» interconnects; Manufacturing methods related thereto
H01L2224/42—Wire connectors; Manufacturing methods related thereto
H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
H01L2224/4805—Shape
H01L2224/4809—Loop shape
H01L2224/48091—Arched
H—ELECTRICITY
H01—ELECTRIC ELEMENTS
H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
H01L33/58—Optical field-shaping elements
H01L33/60—Reflective elements
Description
PATENT SPECIFICATION
( 21) Application No 1809/78 ( 22) Filed 17 Jan 1978 ( 31) Convention Application No 7701566 ( 32) Filed 20 Jan 1977 in ( 33) France (FR) ( 44) Complete Specification published 27 Feb 1980 ( 51) INT CL 3 G 09 F 9/33 HOIL 33/00 ( 52) Index at acceptance G 5 C A 334 A 361 HH HIK IEA 5 H 2 N PG ( 54) DEVICE FOR DISPLAYING ALPHANUMERICAL CHARACTERS ( 71) We, N V PHILIPS’ GLOEILAMPENFABRIEKEN, a limited liability Company, organised and established under the laws of the Kingdom of the Netherlands, of Emmasingel 29, Eindhoven, the Netherlands, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the fol-
lowing statement: –
The invention relates to a display device for displaying for example, alphanumerical characters and comprising a block of insulating material which is provided with cavities, at least one semiconductor electroluminescent diode being provided at the bottom of each cavity.
For displaying information or digital and alphanumerical data, devices are used which display the characters in a form composed of rectilinear luminescent elements Electroluminescent elements are used which are formed by diodes having semiconductor junctions when the displayed characters are required to be observed from a distance and when several of the characters are required to be provided in the proximity of each other.
In the case when groups of diodes are used, each diode fixed on a suitable support forms a punctiform light source which is transformed into an image, for example a rectangular image, by known means.
In order to realize this transformation, one of the most conventional methods is described in United States Patent Specification No.
3,780,357.
According to the United States Patent Specification, each diode constituting the punctiform light source, is provided at the bottom of a cavity which is provided in a usually rectangular block of an insulating material which is usually manufactured from a synthetic resin which material for reasons of reliability, should be capable of withstanding temperatures above 1000 C This condition usually restricts the choice of insulating materials to polycarbonates, polyamides, polysulphones or to polyesters In addition, however, in order to give good or optimal reflection of radiations from the wall of each cavity, the material of the block should be white while each aperture, the shape optimally being approximately pyramidal, is filled with a diffusing epoxy resin which is usually coloured and which has the property of strongly adhering to the white synthetic material of the block.
When the aforesaid differing requirements are taken into account, the choice of the synthetic resin of the block is restricted to the use of a polycarbonate to which a quantity of white pigment, for example, Ti O,, has been added so as to give the polycarbonate a white colour.
The method described in said United States Patent Specification has several disadvantages.
In order to ensure a good legibility of the displayed characters of the display device a strong contrast should be realized between the surface of the device and the light sources.
The block comprising the cavities may thus be formed by a white polycarbonate having a large reflecting capacity which may even be reflected through a filter, if present This results in that the illuminated zones need to be truly delimited with respect to the dark zones, namely the illuminated zones and the dark zones of the major surface into which the cavities debouch and on which the displayed character is written For this purpose it is necessary to cover the external surface of the major surface and usually the outer surface of the laterial walls of the block with at least a layer of dull paint for example, preferably dull black paint.
This paint, however, the cost-price of which is high, only poorly withstands mechanical and thermal influences and weather conditions, and in addition can easily be scratched Moreover, the paint only poorly withstands the influence of chemical reagents and in particular has a poor resistance to solvents which are used in carrying out the method of manufacturing the display device In these circumstances it is established that after a few manipulations or after a few hours in operation of the display device, the paint used has lost its originally favourable characteristics and may have even disappeared entirely in certain places.
( 11) 1 561 623 1,561,623 Furthermore, it is clear that the provision of the black paint requires special measures to avoid the paint from penetrating into the cavities the walls of which must remain pure white S in order to facilitate reflection of the radiation.
Due to automation difficulties in the method of applying the paint it may be necessary to repeated the technique of applying the paint as many times as there are surfaces to be painted on each block.
Because of this it was established that if a layer of paint is required on a block the result is that the cost-price of the block is tripled.
One object of the present invention is to mitigate the aforesaid disadvantages.
For this purpose, the invention is concerned with the properties of chemical inertness of certain plastics materials with respect to the types of resin usually used in electronic devices for the transfer of radiation.
According to the present invention there is provided a display device which is suitable for displaying alphanumerical characters and comprising a block of insulating material which is provided with cavities, at least one semiconductor electroluminescent diode being provided at the bottom of each cavity, characterised in that each of the cavities provided in the block is filled wih a light transmissive resin, the light transmissive resin and the insulating material of the block being chosen from two groups of materials which do not adhere together.
Since the resin filling the cavities in the block does not adhere to the insulating material constituting the block, an intermediate layer is formed between the block and the resin of the cavities This layer performs the role of a mirror which reflects the light emitted by the electroluminescent diodes to the major surface of the display device.
The insulating material from which the block is formed advantageously may be impervious to light emitted by the electroluminescent diodes In this manner the function of light conductor of each cavity of the block is intensified and the path of the radiation is fully bounded by the walls of each cavity from the bottom of the light emitting cavity.
In these circumstances it is also unnecessary to provide a layer of black paint on the outer surfaces of the block The transparent resin filling the cavities of the block may be an epoxy resin, such as, a polymerisable liquid epoxy resin of the cycloaliphatic type or of the bisphenol A type The resin may be further selected for its properties of good transparency and good dielectricity In this case the material of the block is a thermoplastics material which is selected either from the group of polyolefin polymers, such as, polyethylene or polypropylene, or from the group of halo-hydrocarbon polymers which contain fluorine such as, polyfluoroethylenes for example, polytetrafluoroethylene, the substances of the two groups having the property of not adhering to the transparent resins, for example, the epoxy resins known so far to those skilled in the art.
Particularly suitable polyolefin polymers are on the one hand, polypropylene polymers of the low pressure polyethylenes having as its formula (-CH 2 CH-)n CH, and on the other hand, the polymer of methyl pentene of which the configuration of the elementary element is represented by the chain -CH-CH 2 CH 2 CH CH 3 CH 3 of which one of the most frequently used forms is commercially available as TPX.
As regards the group of the polyfluoroethylenes, polytetrafluoroethylene which is commerically known as Teflon (a registered Trade Mark) is particularly suitable.
The thermoplastic materials generally are selected for their exceptional optical qualities and also for their behaviour at high temperatures It has been established, for example, the aforesaid materials permit the display devices of the invention to operate at temperatures which are at least 200 higher than the operating temperatures which devices obtained from polycarbonate can withstand Moreover, the thermoplastics materials comprising the aforesaid polyolefins and/or polyfluoroethylenes are insensitive to solvents and also to other chemical reagents which are commonly used in the conventional methods of manufacturing display devices, while in addition these materials have a considerable hardness.
In order to improve the contrast, the thermoplastics material constituting the block may be coloured for example, by adding a quantity of carbon black to the thermoplastics material, so as to obtain a dark tint In addition, in order to protect the thermoplastics material against ultraviolet radiation and to avoid the slow degradation of the material, the thermoplastics material may be covered with an ultraviolet radiation impervious layer such as a layer of carbon black.
By making the block of an insulating mhaterial comprising a thermoplastics material belonging to the groups of polyolefins and polyfluoroethylenes it is possible to use in the cavities of the block a transparent resin of the epoxy type which instead of having an amine hardener has an anhydride hardener The use of an anhydride hardener was impossible when, prior to the present invention, the block was 1,561,623 obtained from a polycarbonate; for this material has the property of being attacked by anhydride hardeners.
It is known that it is possible by the use of an anhydride hardener instead of an amine hardener to avoid the progressive yellowing of the resin which occurs under the combined influence of the temperature and the ambient oxygen atmosphere.
An embodiment of the invention will now be described by way of example with reference to the accompanying drawing in which:
Figure 1 is a perspective view of a display device according to the invention, 1 S Figure 2 is a diagrammatic sectional view on an enlarged scale of a cavity of the display device according to the invention.
It is to be noted that, for clarity, the dimensions in the said Figures are considerably enlarged and are not drawn to the same scale.
The display device shown in Figure 1 comprises a block 1 of insulating material comprising a black thermoplastics material: the material chosen is, for example, a polymer of methyl pentene of the TPX-type to which carbon black was added Cavities 2 with a substantially pyramidal form, are provided in the block 1 In the most conventional form of the display devices, said devices comprise seven cavities 2 and said cavities are arranged in the block 1 so that two partially superimposed squares are formed at the surface of the block 1 to give a figure of eight shape.
The electroluminescent diodes 3 consisting of semiconductor crystals are provided in the lower part of the cavities 2 and are secured to a metal support or comb 4.
As shown in Figure 2, the cavities 2 are filled with a transparent resin comprising an epoxy resin 5 The resin used is, for example, a resin of the cycloaliphatic type to which a suitable hardener has been added, together with, if desired a filler powder which diffuses the light, and/or a dye.
The thermoplastics material constituting the block 1 and the epoxy resin 5 have the property of not adhering together In these circumstances, an interface 6 which reflects the light emitted by the diode 3 is formed between the walls of the cavity 2 and the epoxy resin 5.
It is the formation of such a «mirror» which permits of replacing the white walls of the cavities by black walls which are manufactured from a material the cost-price of which is much lower.
Claims (12)
WHAT WE CLAIM IS: –
1 A display device which is suitable for displaying alphanumerical characters and comprising a block of insulating material which is provided with cavities, at least one semiconductor electroluminescent diode being provided at the bottom of each cavity, characterized in that each of the cavities provided in the block is filled with a light transmissive resin, the light transmissive resin and the insulating material of the block being chosen from two groups of materials which do not adhere together.
2 A device as claimed in Claim 1, characterized in that the insulating material from which the block is formed is impervious to the light emitted by the electroluminescent diodes.
3 A device as claimed in Claim 1 or 2, characterized in that the cavities of the block are filled with an epoxy resin.
4 A device as claimed in Claim 3, characterized in that said epoxy resin is of the cycloaliphatic type.
A device as claimed in Claim 3, characterized in that said epoxy resin is of the bisphenol A type.
6 A device as claimed in any of the Claims 1 to 5, characterized in that said block is formed from a thermoplastics material belonging to the group of the polyolefins.
7 A device as claimed in Claim 6, characterized in that said thermoplastics material is polypropylene.
8 A device as claimed in Claim 6, characterized in that said thermoplastics material is a polymer of methyl pentene.
9 A device as claimed in any of the Claims 1 to 5, characterized in that said block is formed from a thermoplastics material belonging to the group of the polyfluoroethylenes.
A device as claimed in Claim 9, characterized in that said thermoplastics material is polytetrafluoroethylene.
11 A device as claimed in any of the Claims 1 to 10, characterized in that a quantity of carbon black is added to said insulating material from which said block is formed.
12 A display device substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying drawings.
R J BOXALL, Chartered Patent Agent, Berkshire House, 168-173 High Holborn, London, WC 1 V 7 AQ.
Agent for the Applicants.
Printed for Her Majesty’s Stationery Office, by the Courier Press, Leamington Spa, 1980 Published by The Patent Office, 25 Southampton Buildings, London WC 2 A l AY, from which copies may be obtained.
GB1809/78A
1977-01-20
1978-01-17
Device for displaying alphanumerical characters
Expired
GB1561623A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
FR7701566A
FR2378324A1
(en)
1977-01-20
1977-01-20
PERFECTION IN THE REALIZATION OF DISPLAY DEVICES
Publications (1)
Publication Number
Publication Date
GB1561623A
true
GB1561623A
(en)
1980-02-27
Family
ID=9185710
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1809/78A
Expired
GB1561623A
(en)
1977-01-20
1978-01-17
Device for displaying alphanumerical characters
Country Status (5)
Country
Link
US
(1)
US4267486A
(en)
JP
(1)
JPS5912172B2
(en)
DE
(1)
DE2800726C2
(en)
FR
(1)
FR2378324A1
(en)
GB
(1)
GB1561623A
(en)
Families Citing this family (12)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2471014A1
(en)
*
1979-11-28
1981-06-12
Radiotechnique Compelec
ELECTROLUMINESCENT DIODE DISPLAY DEVICE
US4467193A
(en)
*
1981-09-14
1984-08-21
Carroll Manufacturing Corporation
Parabolic light emitter and detector unit
DE3320953A1
(en)
*
1983-06-10
1984-12-13
Telefunken electronic GmbH, 7100 Heilbronn
Optoelectronic component
JPS63164259U
(en)
*
1987-04-14
1988-10-26
DE3737861A1
(en)
*
1987-11-07
1989-05-18
Mueller Werner Dipl Wirtsch In
ELECTRONIC LIGHTING ELEMENT WITH OPTIMIZED LIGHT OUTPUT, METHOD FOR THE PRODUCTION THEREOF
US5167556A
(en)
*
1990-07-03
1992-12-01
Siemens Aktiengesellschaft
Method for manufacturing a light emitting diode display means
KR100309623B1
(en)
*
1994-02-28
2002-04-24
사토 게니치로
Light emitting diode lamps and matrix indicators using them
US5982092A
(en)
*
1997-10-06
1999-11-09
Chen; Hsing
Light Emitting Diode planar light source with blue light or ultraviolet ray-emitting luminescent crystal with optional UV filter
JP4125848B2
(en)
*
1999-12-17
2008-07-30
ローム株式会社
Chip type light emitting device with case
DE10039433B4
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*
2000-08-11
2017-10-26
Osram Opto Semiconductors Gmbh
Semiconductor chip for optoelectronics
US20100032702A1
(en)
*
2008-08-11
2010-02-11
E. I. Du Pont De Nemours And Company
Light-Emitting Diode Housing Comprising Fluoropolymer
FR3069102A1
(en)
*
2017-07-13
2019-01-18
Stmicroelectronics (Tours) Sas
PROCESS FOR MANUFACTURING LATERALLY INSULATED CHIPS
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Priority date
Publication date
Assignee
Title
NL239397A
(en)
*
1960-03-30
US3174144A
(en)
*
1960-11-21
1965-03-16
Richard J O’neill
Digital read-out and display unit
US3516724A
(en)
*
1967-03-13
1970-06-23
Wagner Electric Corp
Colored readout assembly
DE1969536U
(en)
*
1967-05-05
1967-09-28
Kurt Brolde
FIBER OPTICAL LIGHT DISPLAY ELEMENT.
US3609475A
(en)
*
1970-05-04
1971-09-28
Hewlett Packard Co
Light-emitting diode package with dual-colored plastic encapsulation
GB1365874A
(en)
*
1970-10-05
1974-09-04
Ici Ltd
Filled polytetrafluoroethylene compositions
US3711733A
(en)
*
1971-11-12
1973-01-16
Ncr
Interconnected electrode display means
JPS5118320B2
(en)
*
1972-03-01
1976-06-09
JPS5223717B2
(en)
*
1972-05-02
1977-06-25
US3780357A
(en)
*
1973-02-16
1973-12-18
Hewlett Packard Co
Electroluminescent semiconductor display apparatus and method of fabricating the same
DE2542095A1
(en)
*
1975-09-20
1977-03-24
Licentia Gmbh
SEMI-CONDUCTOR ARRANGEMENT FOR THE NUMERAL DISPLAY
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(en)
*
1975-10-03
1977-03-22
Monsanto Company
Segmented light emitting diode deflector segment
1977
1977-01-20
FR
FR7701566A
patent/FR2378324A1/en
active
Granted
1978
1978-01-09
DE
DE2800726A
patent/DE2800726C2/en
not_active
Expired
1978-01-17
GB
GB1809/78A
patent/GB1561623A/en
not_active
Expired
1978-01-17
JP
JP53002863A
patent/JPS5912172B2/en
not_active
Expired
1979
1979-06-25
US
US06/051,489
patent/US4267486A/en
not_active
Expired – Lifetime
Also Published As
Publication number
Publication date
DE2800726A1
(en)
1978-07-27
US4267486A
(en)
1981-05-12
FR2378324B1
(en)
1979-05-11
JPS5390897A
(en)
1978-08-10
DE2800726C2
(en)
1986-05-07
FR2378324A1
(en)
1978-08-18
JPS5912172B2
(en)
1984-03-21
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Legal Events
Date
Code
Title
Description
1980-05-14
PS
Patent sealed [section 19, patents act 1949]
1992-09-16
PCNP
Patent ceased through non-payment of renewal fee
