DE2220591B1 - Shielding for a display device with reflection cells - Google Patents
Shielding for a display device with reflection cellsInfo
- Publication number
- DE2220591B1 DE2220591B1 DE19722220591D DE2220591DA DE2220591B1 DE 2220591 B1 DE2220591 B1 DE 2220591B1 DE 19722220591 D DE19722220591 D DE 19722220591D DE 2220591D A DE2220591D A DE 2220591DA DE 2220591 B1 DE2220591 B1 DE 2220591B1
- Authority
- DE
- Germany
- Prior art keywords
- light
- cells
- reflection
- reflection cells
- shield
- 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.)
- Pending
Links
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
- G09F9/35—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 liquid crystals
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
-
- 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
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/16—Signs formed of or incorporating reflecting elements or surfaces, e.g. warning signs having triangular or other geometrical shape
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nonlinear Science (AREA)
- Geometry (AREA)
- Mathematical Physics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
Eine solche lichtstreuende Reflexionszelle 2 kann ihre Funktion als Anzeigeelement nur erfüllen, wenn genügend Licht auf die Reflexionszelle einfällt. Durch die starke Lichtstreuung nimmt dabei der Kontrast zwischen den angesteuerten und den spannungslosen Reflexionszellen 2 mit wachsender Beleuchtung zu, d. h., die Anzeige kann um so besser erkannt werden, je größer der Lichteinfall ist. Die Anwendung einer im Gerät untergebrachten eigenen Beleuchtungsquelle würde jedoch die elektrische Gesamtleistunesbil anz erheblich erhöhen und scheidet daher. insbesondere für batteriebetriebene Geräte. aus. Andererseits wird das vorhandene Licht auch von den mit der spiegelnden Oberfläche versehenen. unteren Elektroden 4 der spannungslosen Reflexionszellen 2 reflektiert, wodurch die Anzeige beeinträchtigt wird. Such a light-scattering reflection cell 2 can function as a Only fulfill the display element if enough light is incident on the reflection cell. Due to the strong light scattering, the contrast between the activated ones increases and the de-energized reflection cells 2 with increasing illumination, d. H., the greater the incidence of light, the better the display can be recognized. the Use of a dedicated lighting source housed in the device would however, the electrical overall power balance increase considerably and is therefore eliminated. especially for battery-operated devices. the end. On the other hand, the existing Light also from those provided with the reflective surface. lower electrodes 4 of the de-energized reflection cells 2 are reflected, thereby impairing the display will.
Es ist daher eine Abschirmung 6 vorgesehen, die vom Betrachter aus gesehen. dessen Blickrichtung durch Pfeil 7 angedeutet ist, hinter und oberhalb der im wesentlichen horizontal liegenden Reflexionszellein 2 angeordnet ist. Die Abschirmung 6 verhindert. There is therefore a shield 6 is provided from the viewer seen. whose viewing direction is indicated by arrow 7, behind and above of the essentially horizontally lying reflection cell in FIG. the Shield 6 prevented.
daß an den spannungslosen Reflexionszellen 2 reflektiertes Licht aus der Umgebung direkt in das Auge des Betrachters fällt. dieser also geblendet wird. Um störende Reflexe auszuschalten. ist die Abschirmung 6 auf der Innenfläche blendungsfrei beschichtet. z.B. geschwärzt. Das Licht aus der Umgebung kann zunächst von rechts auf die veränderbaren Reflexionszellen 2 fallen. Die angesteuerten Reflexionszellen 2 werden dabei durch »rückgestreutes« Licht sichtbar.that at the de-energized reflection cells 2 reflected light of the surroundings falls directly into the eye of the beholder. so this is blinded. To switch off annoying reflexes. the shield 6 is glare-free on the inner surface coated. e.g. blackened. The light from the surroundings can initially come from the right fall on the changeable reflection cells 2. The controlled reflection cells 2 become visible through "backscattered" light.
Zur Erhöhung der Leuchtstärke der die Lichtstreuung verursachenden Reflexionszellen 2 weist der obere Teil der Abschirmung 6 ein Lamellenraster 8 auf, dessen senkrecht stehende. parallel angeordnete Lamellen 9 zweckmäßig ebenfalls beidseitig blendungsfrei beschichtet sind. Dadurch werden die im wesentlichen horizontal liegenden Reflexionszellen 2 zusätzlich von oben beleuchtet, die Lichtausbeute sowie der Kontrast zwischen den angesteuerten und spannungslosen Reflexionszellen erhöht und damit die Erkennbarkeit der Anzeige verbessert. To increase the luminosity of the light scattering causing Reflection cells 2, the upper part of the shield 6 has a lamellar grid 8, its vertical standing. slats 9 arranged in parallel also expediently are coated on both sides without glare. This makes them essentially horizontal lying reflection cells 2 additionally illuminated from above, the light output as well the contrast between the activated and de-energized reflection cells increases and thus the readability of the display is improved.
Wie der gestrichelt dargestellte Strahlengang 10 in Fig. 2 zeigt, ist das Lamellenraster 8 geometrisch so dimensioniert. daß schräg von oben einfallendes und an den spannungslosen Reflexionszellen 2 reflektiertes Licht aus der Umgebung zwar auf die Innenfläche des oberen Teils der Abschirmung6. aber nicht in den Betraehtungsbereich fällt. der auch beidseitig des Pfeils 7 liegen kann. As the beam path 10 shown in dashed lines in FIG. 2 shows, the louvre grid 8 is geometrically dimensioned so. that obliquely falling from above and light from the surroundings reflected at the de-energized reflection cells 2 on the inner surface of the upper part of the shield6. but not in the observation area falls. which can also lie on both sides of the arrow 7.
Das Licht wird durch das Lamellenraster 8 um so senkrechter gerichtet. je länger und enger die einzelnen Lamellen 9 des Lamellenrasters 8 angeordnet sind. In F i g. , ist ein Lamellenraster 11 dargestellt. The light is directed more perpendicularly through the louvre 8. the longer and narrower the individual slats 9 of the slat grid 8 are arranged. In Fig. , a louvre grid 11 is shown.
dessen parallel verlaufende Lamellen 12 relativ lang und eng zueinander angeordnet sind. Es ist daher möglich, wie durch den Strahlengang 13 angedeutet ist. daß die Reflexionszellen 2 zum Betrachter hin geneigt angeordnet sind. ohne eine Reflexion in den Betrachtungsbereich stattfinden zu lassen. Selbstverständlich müssen auch die Lamellen des Lamellenrasters nicht genau senkrecht stehen. Sie können z. B.whose parallel slats 12 are relatively long and close to one another are arranged. It is therefore possible, as indicated by the beam path 13 is. that the reflection cells 2 are arranged inclined towards the viewer. without to allow a reflection to take place in the viewing area. Of course the slats of the slat grid do not have to be exactly vertical either. You can z. B.
nach einer geringen Drehung im Uhrzeigersinn schräg angeordnet sein, wie die Lamellen 14 eines Lamellenrasters 15 in F i g. 4 zeigen. um die Reflexionszellen 2 noch weiter zum Betrachter hin neigen zu können, wodurch ggf. die Ablesung verbessert wird.be arranged at an angle after a slight clockwise rotation, like the slats 14 of a slat grid 15 in FIG. 4 show. around the reflection cells 2 to be able to incline even further towards the viewer, which may improve the reading will.
Mit der erfindungsgemäßen Abschirmung ist eine Anzeigevorrichtung geschaffen worden. bei der alle vorgenannten Nachteile, insbesondere eine Blendung des Betrachters beim Ablesen der Anzeigevorrichtung, vermieden werden, ohne den Einfall von Licht aus der Umgebung merklich herabzusetzen, wodurch die Erkennbarkeit der Anzeigevorrichtung erhöht wird. With the shield according to the invention is a display device created. with all of the aforementioned disadvantages, especially glare of the viewer when reading the display device, can be avoided without the Reduce the incidence of light from the environment noticeably, thereby increasing the perceptibility the display device is increased.
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2220591 | 1972-04-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2220591B1 true DE2220591B1 (en) | 1972-11-02 |
Family
ID=5843394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19722220591D Pending DE2220591B1 (en) | 1972-04-27 | 1972-04-27 | Shielding for a display device with reflection cells |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2220591B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2355134A1 (en) * | 1973-11-05 | 1975-05-07 | Vdo Schindling | DISPLAY DEVICE |
-
1972
- 1972-04-27 DE DE19722220591D patent/DE2220591B1/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2355134A1 (en) * | 1973-11-05 | 1975-05-07 | Vdo Schindling | DISPLAY DEVICE |
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