FR2598012A3 - Liquid crystal display - Google Patents
Liquid crystal display Download PDFInfo
- Publication number
- FR2598012A3 FR2598012A3 FR8606370A FR8606370A FR2598012A3 FR 2598012 A3 FR2598012 A3 FR 2598012A3 FR 8606370 A FR8606370 A FR 8606370A FR 8606370 A FR8606370 A FR 8606370A FR 2598012 A3 FR2598012 A3 FR 2598012A3
- Authority
- FR
- France
- Prior art keywords
- liquid crystal
- display device
- creating
- crystal display
- contrast effect
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 19
- 239000011521 glass Substances 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000003973 paint Substances 0.000 claims description 3
- 239000005101 luminescent paint Substances 0.000 claims 2
- 239000013078 crystal Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
Abstract
Description
La présente invention concerne les dispositifs d'affichage du type à cristaux liquides.The present invention relates to liquid crystal type display devices.
Les dispositifs de ce genre comprennent, de façon connue, un film de cristaux liquides disposé entre deux plaques de verre soudées. Sur l'une de ces plaques sont disposés des éléments conducteurs, en forme de digits, reliés à une électronique de commande. Ces digits sont destinés, par passage d'un courant électrique dans certaines d'entre elles et selon diverses combinaisons, à faire apparaître des informations.Devices of this kind comprise, in a known manner, a film of liquid crystals disposed between two welded glass plates. On one of these plates are arranged conductive elements, in the form of digits, connected to control electronics. These digits are intended, by the passage of an electric current in some of them and in various combinations, to reveal information.
En effet, le champ électrique, dû au courant passant par les digits sélectionnés, provoque des différences d'orientation du cristal liquide qui sont lisibles par réflexion de la lumière incidente. Mais, dans certaines conditions d'éclairement cette lecture devient difficile voire impossible sous un trop faible éclairage.Indeed, the electric field, due to the current passing through the selected digits, causes differences in orientation of the liquid crystal which are readable by reflection of the incident light. However, under certain lighting conditions, this reading becomes difficult or even impossible under too low lighting.
Le dispositif selon l'invention permet d'éviter cet inconvénient. I1 comprend en effet des moyens, visibles au travers de l'afficheur transparent ou translucide, capables de créer un effet de contraste permanent entre les éléments excités et non excités du cristal liquide.The device according to the invention avoids this drawback. I1 indeed comprises means, visible through the transparent or translucent display, capable of creating a permanent contrast effect between the excited and non-excited elements of the liquid crystal.
Pour ce faire, l'élément afficheur, comprénant le cristal liquide entre deux plaques de verre, est combiné avec des moyens, visibles au travers dudit élément afficheur et capables d'émettre de la lumière par restitution d'énergie lumineuse.To do this, the display element, comprising the liquid crystal between two glass plates, is combined with means, visible through said display element and capable of emitting light by restitution of light energy.
Ces moyens consistent en une couche de peinture photoluminescente capable de restituer la lumière, reçue pendant de courtes périodes d'éclairement, lorsque les conditions de lumière ambiante sont mauvaises.These means consist of a layer of photoluminescent paint capable of restoring the light, received during short periods of illumination, when the ambient light conditions are poor.
En variante le matériau luminescent, à base de produits phosphorescents et fluorescents, peut être incorporé dans l'une des plaques de verre ou de plastique du cristal liquide, par exemple la plaque située derrière le cristal liquide par rapport à un observateur. Ce matériau se recharge en énergie et se sature suite une expositionà la lumière relativement courte, de l'ordre de vingt secondes et peut ensuite restituer de l'energie lumineuse pendant plus d'une heure.As a variant, the luminescent material, based on phosphorescent and fluorescent products, can be incorporated into one of the glass or plastic plates of the liquid crystal, for example the plate situated behind the liquid crystal with respect to an observer. This material recharges in energy and saturates following a relatively short exposure to light, of the order of twenty seconds and can then restore light energy for more than an hour.
Le dessin annexé illustre, à titre d'exemple, un mode de réalisation du dispositif conforme à la présente invention.The appended drawing illustrates, by way of example, an embodiment of the device according to the present invention.
Tel qu'il est représenté, le dispositif consiste en un afficheur à cristaux liquides comprenant, de façon connue, un film de cristal entre deux lames de verre soudées 1,2 des métallisations 22 déposées sur la lame arrière 2 et reliées, au travers d'un élément connecteur 3, à un circuit imprimé 4 servant de support à une électronique de commande 5. Un cadre rigide 6 fixé sur le circuit imprimé maintient la cohésion de l'ensemble. Les deux lames de verre sont transparentes ou translucides et la couche de peinturephotoluminescente 31 est, par exemple, déposée sur le circuit imprimé 4 sur sa face en regard du cristal liquide ou directement déposée sur la face 21 de la lame de verre 2.As shown, the device consists of a liquid crystal display comprising, in a known manner, a crystal film between two welded glass blades 1,2 of the metallizations 22 deposited on the rear blade 2 and connected, through 'a connector element 3, to a printed circuit 4 serving as a support for control electronics 5. A rigid frame 6 fixed on the printed circuit maintains the cohesion of the assembly. The two glass slides are transparent or translucent and the photoluminescent paint layer 31 is, for example, deposited on the printed circuit 4 on its face opposite the liquid crystal or directly deposited on the face 21 of the glass slide 2.
En variante, le produit photo luminescent peut avoir été incorporé directement dans la lame de verre 2, au cours de sa fabrication.Alternatively, the photo luminescent product may have been incorporated directly into the glass slide 2, during its manufacture.
L'affichage à cristaux liquides selon l'invention permet de créer un effet de contraste permanent quelles que soient les conditions d'éclairement. Pour de longues périodes d'obscurité, il suffit de prévoir dans le temps de courtes périodes d'éclairement, au moyen d'une source lumineuse extérieure, pour recharger le dispositif.The liquid crystal display according to the invention makes it possible to create a permanent contrast effect whatever the lighting conditions. For long periods of darkness, it is sufficient to provide short periods of lighting over time, by means of an external light source, to recharge the device.
Une application particulièrement intéressante peut être l'affichage d'informations sur les publiphones pour lesquels l'énergie disponible sur la ligne téléphonique est trop faible pour alimenter des moyens d'éclairage classique. Dans ce cas un éclairage extérieur déclenché par intermittence serait suffisant pour assurer une lisibilité constante de l'affichage è cristaux liquides. Une autre utilisation peut être l'éclairage des tableaux de bord. A particularly interesting application can be the display of information on payphones for which the energy available on the telephone line is too low to supply conventional lighting means. In this case an external lighting triggered intermittently would be sufficient to ensure a constant readability of the liquid crystal display. Another use can be for lighting dashboards.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8606370A FR2598012B3 (en) | 1986-04-29 | 1986-04-29 | LIQUID CRYSTAL DISPLAY |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8606370A FR2598012B3 (en) | 1986-04-29 | 1986-04-29 | LIQUID CRYSTAL DISPLAY |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2598012A3 true FR2598012A3 (en) | 1987-10-30 |
| FR2598012B3 FR2598012B3 (en) | 1988-04-15 |
Family
ID=9334858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8606370A Expired FR2598012B3 (en) | 1986-04-29 | 1986-04-29 | LIQUID CRYSTAL DISPLAY |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2598012B3 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001039629A1 (en) * | 1999-12-02 | 2001-06-07 | Victorinox Ag | Support for functional elements, especially a set of tools or a pocket knife |
| GB2374564A (en) * | 1999-12-02 | 2002-10-23 | Victorinox Ag | Support for functional elements especially a set of tools or a pocket knife |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2190307A5 (en) * | 1972-06-16 | 1974-01-25 | Thomson Csf | |
| GB1386714A (en) * | 1972-02-07 | 1975-03-12 | Suwa Seikosha Kk | Liquid crystal display device |
| DE2436658B1 (en) * | 1974-07-30 | 1976-02-05 | Siemens Ag | LIQUID CRYSTAL DISPLAY SCREEN |
| DE2719808A1 (en) * | 1976-04-29 | 1977-11-10 | Ebauches Sa | Passive electro-optical indicator - has opaque inorganic particles distributed in photoconductor to produce scattering effect |
| DE2813007A1 (en) * | 1977-03-22 | 1978-09-28 | Ebauches Sa | Two colour passive electro-optical display cell - has scattering rear plate to increase display contrast |
| US4518225A (en) * | 1983-04-11 | 1985-05-21 | Rockwell International Corporation | Multicolored liquid crystal displays utilizing photoluminescent transflectors and mask |
-
1986
- 1986-04-29 FR FR8606370A patent/FR2598012B3/en not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1386714A (en) * | 1972-02-07 | 1975-03-12 | Suwa Seikosha Kk | Liquid crystal display device |
| FR2190307A5 (en) * | 1972-06-16 | 1974-01-25 | Thomson Csf | |
| DE2436658B1 (en) * | 1974-07-30 | 1976-02-05 | Siemens Ag | LIQUID CRYSTAL DISPLAY SCREEN |
| DE2719808A1 (en) * | 1976-04-29 | 1977-11-10 | Ebauches Sa | Passive electro-optical indicator - has opaque inorganic particles distributed in photoconductor to produce scattering effect |
| DE2813007A1 (en) * | 1977-03-22 | 1978-09-28 | Ebauches Sa | Two colour passive electro-optical display cell - has scattering rear plate to increase display contrast |
| US4518225A (en) * | 1983-04-11 | 1985-05-21 | Rockwell International Corporation | Multicolored liquid crystal displays utilizing photoluminescent transflectors and mask |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001039629A1 (en) * | 1999-12-02 | 2001-06-07 | Victorinox Ag | Support for functional elements, especially a set of tools or a pocket knife |
| GB2374564A (en) * | 1999-12-02 | 2002-10-23 | Victorinox Ag | Support for functional elements especially a set of tools or a pocket knife |
| GB2374564B (en) * | 1999-12-02 | 2004-01-21 | Victorinox Ag | Support for functional elements especially a set of tools or a pocket knife |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2598012B3 (en) | 1988-04-15 |
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