DE102016003627A1 - Screen and procedure for a free and a restricted view mode - Google Patents

Screen and procedure for a free and a restricted view mode

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Publication number
DE102016003627A1
DE102016003627A1 DE102016003627.3A DE102016003627A DE102016003627A1 DE 102016003627 A1 DE102016003627 A1 DE 102016003627A1 DE 102016003627 A DE102016003627 A DE 102016003627A DE 102016003627 A1 DE102016003627 A1 DE 102016003627A1
Authority
DE
Germany
Prior art keywords
light
display unit
image display
backlight
restricted
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
Application number
DE102016003627.3A
Other languages
German (de)
Inventor
Uwe Schröter
Jürgen Schwarz
Ambrose Peter Nari
Markus Klippstein
Stepan Alkhimenko
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.)
SIOPTICA GmbH
Original Assignee
SIOPTICA GmbH
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.)
Filing date
Publication date
Application filed by SIOPTICA GmbH filed Critical SIOPTICA GmbH
Priority to DE102016003627.3A priority Critical patent/DE102016003627A1/en
Priority claimed from US15/778,105 external-priority patent/US10241355B2/en
Publication of DE102016003627A1 publication Critical patent/DE102016003627A1/en
Application status is Pending legal-status Critical

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Other optical systems; Other optical apparatus
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/1323Arrangements for providing a switchable viewing angle
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504Diffusing, scattering, diffracting elements
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30Indicating 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30Indicating 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
    • G09F9/35Indicating 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
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F2001/13356Particular location of the optical element
    • G02F2001/133562Particular location of the optical element on the viewer side
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F2001/133626Illuminating devices providing two modes of illumination, e.g. day-night
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00Function characteristic
    • G02F2203/62Switchable arrangements whereby the element being usually not switchable

Abstract

The invention relates to a screen (1), comprising a backlight (2) which, in the operating mode B1, emits light in a non-restricted angular range for a free viewing mode, and which emits light in a restricted angular range in the operating mode B2 for a restricted viewing mode, a transmissive image display unit (5) arranged in the viewing direction in front of the background lighting (2), illuminating means (4) which are arranged at a distance of at least 1 millimeter above the image display unit (5), the lighting means (4) being switched off in operating mode B1 in that the light emanating from the backlight (2) and passing through the transmissive image display unit (5) is unaffected by the light sources (4), and in the B2 mode the bulbs (4) are switched on, so that the backlight (2) radiated in a restricted angular range and is superimposed by the transmissive image display unit (5) penetrating light of light, which scatters the image display unit (5) due to the irradiation of light from the light sources (4) diffused and / or directed or -reflektiert, whereby the residual visibility of a on the transmissive Image reproduction unit (5) displayed image is reduced outside the said restricted angle range. In an extension, a light guide (3) located in the viewing direction in front of the image display unit (5) is present whose narrow sides are arranged laterally next to the said light sources (4). Furthermore, a corresponding method is described.

Description

  • Field of the invention
  • In recent years, great progress has been made in broadening the viewing angle of LCDs. However, there are often situations in which this very large viewing area of a screen can be disadvantageous. Increasingly, information is also becoming available on mobile devices such as notebooks and tablet PCs, such as bank details or other personal information, and sensitive data. Accordingly, people need control over who can see this sensitive data; you have to be able to choose between a wide viewing angle to share information on your display with others, eg. B. when viewing holiday photos or for promotional purposes. On the other hand, they need a small viewing angle if they want to treat the image information confidentially.
  • State of the art
  • Supplementary films based on micro-blades have already been used for mobile displays to achieve their optical data protection. However, these slides were not (re) switchable, they always had to be placed by hand and then removed again. Also you have to transport them separately to the display, if you do not need them right now. A major disadvantage of the use of such lamellar films is also associated with the accompanying loss of light.
  • The US 6,765,550 describes such a screen by micro-blades. The biggest disadvantage here is the mechanical removal or mechanical attachment of the filter as well as the loss of light in the protected mode.
  • In the US 5,993,940 the use of a film is described, which has evenly arranged on its surface, small prism strips to achieve a privacy mode. Development and production are quite expensive.
  • In the WO 2012/033583 the switching between free and limited vision is generated by means of the control of liquid crystals between so-called "chromonic" layers. This creates a loss of light and the effort is quite high.
  • The font US 2009/0067156 discloses a variety of ideas for designing a lighting system and a display device. The there in the 3A and 3B shown variant uses in particular two backlights, so-called backlights, consisting of wedge-shaped light guides, and an LCD panel, the rear backlight 40 Mandatory a wide angle of illumination and the front backlight 38 imperative to produce a narrow illumination angle. However, the functionality remains unclear, as the backlight 38 To create a narrow illumination angle without the light with a wide illumination angle, which from the backlight 40 when passing through the backlight 38 is essentially converted into light with a narrow illumination angle.
  • To the design after 5 of the US 2009/0067156 It should be noted that both light guides 46 and 48 each produce "narrow light", ie light with a narrow illumination angle. The light of the light guide 48 becomes only through a complex to be created with prismatic submirror 50 in "wide light", ie light with a wide illumination angle, converted. This conversion extremely curtails the light intensity, since the light, which is initially emitted into a narrow illumination angle and is available as the only light, is then fanned out into a large illumination angle, generally the half space. This has the consequence that, depending on the parameters, the brightness by a factor 5 or more (in terms of luminance). It is therefore a less relevant design.
  • In the embodiment according to 7 of the US 2009/0067156 A phosphor layer is absolutely necessary, this is to convert UV light into visible light. This effort is great and in the desire for sufficient light from the backlight to illuminate a LCD panel readable, very large intensities of UV light are needed. Thus, this is expensive, expensive and even from the shielding of the required UV radiation ago not practicable.
  • The US 2012/0235891 describes a very elaborate backlight in a screen. There according to 1 and 15 not only multiple optical fibers are used, but also other complex optical elements such as microlens elements 40 and prismatic structures 50 which transform the light from the rear lighting on the way to the front lighting. This is expensive and expensive to implement and also associated with loss of light. According to the variant 17 in the US 2012/0235891 produce both light sources 4R and 18 Light with a narrow illumination angle, with the light from the rear light source 18 only consuming in light with a large illumination angle, is converted. This complex transformation is - as already noted above - greatly brightness-reducing.
  • According to the JP 2007-155783 become special optical surfaces that are difficult to calculate and produce 19 used, which then divert light depending on the angle of light in different narrow or wide areas. These structures are similar to Fresnel lenses. There are also interfering edges which deflect light in undesired directions. Thus, it remains unclear whether really meaningful light distributions can be achieved.
  • After teaching the GB 2428128 A In order to obtain a limited view, additional light sources, which are clearly removed from the screen and which illuminate a hologram mounted on the screen, are used to superimpose side views with specific wavelengths. The disadvantage here is the required distance of the light sources from the screen and the effort to produce appropriate holograms.
  • In the US publication 2013/0308185 describes a special step-shaped optical fiber which emits light on a large area in different directions, depending on which direction it is illuminated from a narrow side. In interaction with a transmissive image display unit, z. As an IC display, thus a switchable between free and limited viewing mode screen can be generated. The disadvantage here is, inter alia, that the limited visual effect either only for left / right or up / down, but not for left / right / up / down can be generated simultaneously, as it is necessary for certain payment transactions. In addition, even in the restricted viewing mode from blocked viewing angles, a residual light is still visible.
  • Finally, that describes DE 10 2014 003 298 A1 Method and arrangement for optionally limiting the recognizability of images. For this purpose, a special optical element is necessary, which is at least 70% transparent to the light emanating from the screen, and which deflects laterally incident light from light sources into a restricted angular range in such a way that in directions alpha greater than gamma with gamma greater than 20 degrees to the surface normal of the screen, the light emanating from the screen is superimposed with the light deflected by the optical element, thereby substantially only the image displayed on the screen from angles beta less gamma to the surface normal of the Screen is fully visible.
  • The above-mentioned methods and arrangements generally have the disadvantage that they significantly reduce the brightness of the basic screen and / or require an active, but at least a special, optical element for mode switching and / or require costly and expensive manufacture and / or or reduce the resolution in freely viewable mode.
  • Description of the invention
  • It is therefore an object of the invention to describe a screen and a method by which a secure display of information can be realized by an optionally limited viewing angle, in a second mode, a free, if possible in the viewing angle unrestricted vision should be possible. The invention should be as inexpensive as possible to implement with simple means. In both modes, the highest possible resolution, particularly preferably the native resolution of the screen used, should be visible. Furthermore, only the least possible loss of light should be introduced through the solution.
  • This object is achieved according to the invention by a screen which can be operated in at least two operating modes B1 for a free viewing mode and B2 for a restricted viewing mode
    • An areally extended backlight, which in the operating mode B1 radiates light into a non-restricted angular range for a free viewing mode, and which emits light in a restricted angular range in the operating mode B2 for a restricted viewing mode,
    • A transmissive image display unit arranged in the viewing direction in front of the backlight, for example an LCD panel,
    • Illuminants which are arranged in the viewing direction outside the active image reproduction area of the image reproduction unit and at the same time at a distance of at least 1 millimeter above the image reproduction unit,
    • Wherein in the operating mode B1 the lighting means are switched off, so that the light emanating from the backlight and then penetrating through the transmissive image display unit remains unaffected by the lighting means, and
    • Wherein in the operating mode B2 the lighting means are switched on, so that the light emitted by the backlight in a restricted angular range and then penetrating through the transmissive image display unit light is superimposed by light which diffuses the image display unit due to the irradiation of light from the lighting means and / or reflected back into the viewing space, thereby reducing the residual visibility of an image displayed on the transmissive image display unit outside said restricted angle range.
  • In the operating mode B2, the image perceptible from oblique viewing directions blocked by the angle restriction is depending on the configuration of the lighting means 4 a gray or white surface, but usually not a black surface, since the light, which is the light guide 3 emits, even a black image content visibly outshines.
  • The lighting means may also be arranged at a distance of 2, 3, 4, 5, 6 millimeters or even higher above the image display unit. Other embodiments are possible.
  • In another advantageous embodiment of the screen, a plate-shaped optical waveguide located in the viewing direction in front of the image display unit, which consists of a transparent, thermoplastic or thermoelastic plastic and scattering particles distributed therein, is furthermore present. The said bulbs are arranged laterally on narrow sides of the light guide, wherein the light guide is located at a distance of at least 1 millimeter above the image display unit. As a result, in the operating mode B1 in which the lighting means are switched off, the light emanating from the backlight and then penetrating through the transmissive image display unit passes through the optical waveguide substantially uninfluenced. On the other hand, in the mode B2 in which the bulbs are switched on, the light radiated from the backlight into a restricted angular range and then transmitted through the transmissive image display unit is superimposed by light which diffuses the image display unit due to the irradiation of light from the light guide and / or or directionally reflected back into the viewing space and / or which is radiated by the light guide into the viewing space, so that the residual visibility of an image displayed on the transmissive image display unit is reduced outside the said restricted angle range.
  • The light guide can also be arranged at a distance greater than 1 mm above the image display unit, z. B. 2, 3, 4, 5 or 6 millimeters. Other embodiments are possible.
  • The areally extended backlight may be formed, for example, as in the scriptures WO 2015/121398 or even the US 2013/0308185 proposed. Other embodiments are of course possible. Although such areal-extended backlight radiates light into a limited angular range in most known B2 mode configurations for a limited viewing mode, this directional selection is far from complete, resulting in being on a transmissive image display unit prior to such backlighting even from an oblique view, the image content can still be completely or largely recognized, albeit with low brightness and / or with a weak light-dark contrast. This still possible oblique view is completely or almost completely eliminated on account of the invention: by the superposition of the light emitted by the background illumination in a restricted angular range and then penetrating through the transmissive image reproduction unit light with light, which now radiates the light guide over a large angular range, the residual visibility of an image displayed on the transmissive image display unit is massively reduced outside the said restricted angular range, often even completely turned off. Among other things, said residual visibility has to do with the fact that many LCD panels have a volume scattering and / or a scattering anti-glare surface which partially scatters the light arriving from behind and directed into restricted solid angle, whereby residual visibility is also provided at oblique angles ,
  • In advantageous embodiments, the backlight is off
    • A flat radiator, which is preferably designed as a light guide with laterally arranged light sources,
    • At least one light collimator integrated into the planar radiator and / or arranged in front of it (eg 2 crossed BEF foils, 2 crossed optical lighting films (OLF) type 2301 from 3M , and / or one or more privacy filters, e.g. B. Vikuiti of 3M ),
    • - A arranged in the viewing direction in front of the light collimator plate-shaped, transparent (front) light guide, which consists of a transparent, thermoplastic or thermoelastic plastic and dispersed therein scattering particles, as well as
    • - (front) bulbs, which are arranged laterally on narrow sides of the (front) light guide,
    • - Wherein in the operating mode B1 for a clear field of view, at least the (front) bulbs, and optionally also the flat radiator are turned on (ie if the flat radiator is designed as a light guide, of course, the bulbs of the flat radiator are turned on), and
    • - Wherein in the mode B2 for a limited field of view, the (front) bulbs off and the flat radiator are turned on (ie if the flat radiator is designed as a light guide, also its associated bulbs are turned on).
  • For the (front) light guide and optionally the light guide of the flat radiator, the above-mentioned design possibilities for the light guide above the image reproduction unit apply analogously.
  • Furthermore, a plate-shaped optical waveguide located in the viewing direction in front of the image display unit, which consists of a transparent, thermoplastic or thermoelastic plastic and scattering particles distributed therein, is furthermore particularly preferred, wherein said illuminants are arranged laterally on narrow sides of the optical waveguide, and wherein the optical waveguide in one At least one millimeter is located above the image display unit, whereby in the operating mode B1, in which the bulbs are switched off, the light emanating from the backlight and then penetrating through the transmissive image display unit passes through the light guide substantially unaffected by the light guide B2, in which the lighting means are turned on, the Li emitted by the backlight in a limited angular range and then penetrating through the transmissive image display unit Li Light which is superimposed on the image reproduction unit due to the irradiation of light from the light guide diffusely and / or directed back into the viewing space, so that the residual visibility of an image displayed on the transmissive image display unit is reduced outside the said restricted angle range ,
  • As a rule, the plate-shaped light guide has a haze <10%, preferably <4%, measured according to FIG ASTM D1003 on. Also suitable as scattering particles are, in particular, titanium dioxide particles. However, other embodiments are possible, for example with particles of barium sulfate, with silsesquioxane particles or with crosslinked polystyrene particles or other types of particles. The scattering particles are generally distributed homogeneously, whereby the optical element has no inhomogeneous optical structure. Furthermore, the plate-shaped light guide comprises at least two opposing large surfaces, which are arranged parallel or inclined to each other. A wedge-shaped structure is also possible, although parallel large areas are advantageous. Sensible thicknesses of the light guide are typically between 0.5 mm and 4 mm inclusive. Other thicknesses may also be appropriate case-related.
  • Advantageously used as scattering particles in the transparent light guides titanium dioxide particles having an average particle size of 150-500 nm in a concentration based on the weight of the respective optical fiber of 0.01-300 ppm by weight.
  • It is possible that the transparent light guides each consist of a matrix plastic A and scattering particles of a polymer B distributed therein, wherein the proportion of the scattering particles consisting of polymer B in each case 0.01 to 3 weight percent based on the matrix plastic A, and the refractive index nD (B) of the polymer B is at least 0.002 units above the refractive index nD (A) of the matrix plastic A.
  • Furthermore, it can bring advantages if on the upper side of the image display unit and / or on at least one of the large surfaces of the light guide in front of the image display unit means for reflection reduction, such as a Antiglare and / or an antireflective coating, are arranged. In particular, a Antiglarebeschichtung is in connection with the invention not only the reduction of direct reflections of external light spots, but also allows the scattered back reflection of the image display unit back from the light guide in front of the image display unit emitted light.
  • In all the aforementioned embodiments, the said light sources can be LEDs or LED rows or laser diodes. Other variants are conceivable and are within the scope of the invention.
  • Particularly advantageously, the screen according to the invention finds use for entering or displaying confidential data, for example PIN PIN numbers, e-mails, SMS or passwords, at ATMs, payment terminals or mobile devices.
  • The object of the invention is also achieved by a first method according to the invention for displaying image information in at least two operating modes B1 for a free viewing mode and B2 for a restricted viewing mode, comprising the following steps:
    • For the operating mode B1: flat emission of light into a non-restricted angular range for a free viewing mode, preferably from a planar-extended backlight, or alternatively
    • For the operating mode B2: flat emission of light into a restricted angular range for a restricted viewing mode, preferably from a planarly extended backlight,
    • Modulation of the surface radiated light by means of a transmissive image display unit to impose image information on this light,
    • Providing light sources which are in the viewing direction outside the active image reproduction area of the image display unit and at the same time at a distance of at least 1 Mm above the image display unit are arranged,
    • For the operating mode B1: switching off the lighting means, so that the light emanating from the backlight and then penetrating through the transmissive image display unit remains unaffected by the lighting means, and
    • For the operating mode B2: switching on of the lighting means, so that the light emitted by the backlight in a limited angular range and then penetrating through the transmissive image display unit light is superimposed by light, which diffuses the image display unit due to the irradiation of light from the lighting means and / or is reflected back into the viewing space, thereby reducing the residual visibility of the image information displayed on the transmissive image display unit outside of said restricted angle range.
  • The object of the invention is also achieved by a second method according to the invention for displaying image information in at least two operating modes B1 for a free viewing mode and B2 for a restricted viewing mode, comprising the following steps:
    • For the operating mode B1: flat emission of light into a non-restricted angular range for a free viewing mode, preferably from a planar-extended backlight, or alternatively
    • For the operating mode B2: flat emission of light into a restricted angular range for a restricted viewing mode, preferably from a planarly extended backlight,
    • Modulation of the surface radiated light by means of a transmissive image display unit to impose image information on this light,
    • Providing illuminating means arranged in the viewing direction outside the active image reproduction area of the image reproduction unit and at the same time at a distance of at least 1 millimeter above the image reproduction unit,
    • For the operating mode B1: switching off the lighting means, so that the light emanating from the backlight and then penetrating through the transmissive image display unit remains unaffected by the lighting means, and
    • For the operating mode B2: switching on of the lighting means, so that the light emitted by the backlight in a limited angular range and then penetrating through the transmissive image display unit light is superimposed by light, which diffuses the image display unit due to the irradiation of light from the lighting means and / or is reflected back into the viewing space, thereby reducing the residual visibility of the image information displayed on the transmissive image display unit outside of said restricted angle range.
  • Finally, the object of the invention is also achieved by a further method according to the invention for displaying image information in at least two operating modes B1 for a free viewing mode and B2 for a restricted viewing mode, comprising the following steps:
    • For the operating mode B1: flat emission of light into a non-restricted angular range for a free viewing mode, preferably from a planar-extended backlight, or alternatively
    • For the operating mode B2: flat emission of light into a restricted angular range for a restricted viewing mode, preferably from a planarly extended backlight,
    • Modulation of the surface radiated light by means of a transmissive image display unit to impose image information on this light,
    • - Passing of the thus modulated light through a plate-shaped light guide, which consists of a transparent, thermoplastic or thermoelastic plastic and scattered particles therein, wherein the light guide is disposed at a distance of at least 1 millimeter above the image display unit and arranged laterally on the narrow sides of the light guide bulbs are,
    • For the operating mode B1: switching off the lighting means, so that the light emanating from the backlight and then penetrating through the transmissive image display unit passes through the light guide substantially unaffected, and
    • For the operating mode B2: switching on of the lighting means, so that the light emitted by the backlight in a limited angular range and then penetrating through the transmissive image display unit light is superimposed by light, which diffuses the image display unit due to the irradiation of light from the light guide and / or directed back into the viewing space and / or reflected and / or which is irradiated by the light guide into the viewing space, so that the residual visibility of the image information displayed on the transmissive image display unit is reduced outside the said restricted angle range.
  • In the B2 mode, in both methods, the image perceptible from oblique viewing directions blocked by the angle restriction is a gray or white area, but usually not a black area, since the light that illuminates and, if necessary, the light source is The light guide emits, even a black image content visible outshines.
  • If the surface emission of light is carried out by an areally extended backlight, then this can be formed, for example, as in the scriptures WO 2015/121398 or even the US 2013/0308185 proposed. Other embodiments are of course possible. The plate-shaped light guide generally has a haze of less than 10%, preferably less than 4%, measured according to ASTM D1003 , on. Also suitable as scattering particles are, in particular, titanium dioxide particles. However, other embodiments are possible, for example with particles of barium sulfate, with silsesquioxane particles or with crosslinked polystyrene particles or other types of particles.
  • In an advantageous embodiment, a background illumination is used for the two-dimensional emission of light in both modes B1 and B2, which consists of
    • A flat radiator, preferably a light guide with laterally arranged light sources,
    • At least one light collimator integrated into the planar radiator and / or arranged in front of it (this light collimat consists, for example, of 2 crossed BEF foils, 2 crossed optical-lighting films from 3M and / or one or more privacy filters, eg Vikuiti from 3M TM , or a 4way Light Control Filter by Shin Etsu),
    • - A arranged in the viewing direction in front of the light collimator plate-shaped, transparent (front) light guide, which consists of a transparent, thermoplastic or thermoelastic plastic and dispersed therein scattering particles (for the design of this (front) light guide, the statements made above on the light guide apply before Image display unit analog) and
    • - (front) bulbs, which are arranged laterally on narrow sides of the (front) light guide,
    • - Wherein in the operating mode B1 for a clear field of view, at least the (front) bulbs, and optionally also the flat radiator are turned on (ie, when the planar radiator is designed as a light guide, of course, the bulbs of the flat radiator are turned on), and
    • - In the mode B2 for a limited field of view, the (front) bulbs off and the flat radiator are turned on (ie, when the flat radiator is designed as a light guide, of course, the bulbs of the flat radiator are turned on).
  • Titanium dioxide particles having an average particle size of 150-500 nm in a concentration based on the weight of the respective optical waveguide of 0.01-300 ppm by weight are preferably used as scattering particles in all transparent light guides present.
  • Furthermore, it can bring advantages if on the upper side of the image display unit and / or on at least one of the large surfaces of the light guide in front of the image display unit means for reflection reduction, such as a Antiglare and / or an anti-reflection coating, are arranged. In particular, an antiglare coating in connection with the invention not only serves to reduce the direct reflections of external light spots, but rather also permits the scattered back reflection of the light emitted by the light guide in front of the image display unit to the image display unit.
  • In all the aforementioned embodiments, the said light sources can be LEDs or LED rows or laser diodes. Other variants are conceivable and are within the scope of the invention.
  • For all embodiments, it holds true that each available optical waveguide has at least one light entry surface and at least one light exit surface, wherein the ratio of light exit surface to light entry surface is at least 4.
  • It is particularly preferred for the light guide (s) to use a concentration of scattering agents of titanium dioxide particles of 0.1-50 ppm by weight, preferably 0.1-10 ppm by weight. In this case, the titanium dioxide particles have an average particle size of 160 to 450 nm, more preferably from 170 to 400 nm. The haze of the optical fiber, measured according to ASTM D1003 , ranges from 0, 2 to 2%. Behind the rearmost light guide the backlight, if there is a light guide, for example, a white and / or reflective surface may be arranged.
  • Furthermore, the optical waveguides can contain at least 40% by weight, preferably at least 60% by weight, of polymethyl methacrylate, based on their weight.
  • The planar radiator can be configured, for example, as a side-light, edgelight, direct LED backlight, edge LED backlight, as dark-field illumination, as an OLED or as another surface radiator.
  • Furthermore, the comments and design variants, which have been described above for the screen according to the invention apply in analogous transmission for the inventive method.
  • Furthermore, the desired restricted angle ranges for the restricted view mode B2 can be independently defined and translated for the horizontal and vertical directions, respectively. For example, in the vertical direction, a larger angle (or perhaps no restriction at all) might be useful than in the horizontal direction, such as when ATMs are supposed to see something of different sizes while side-ins should be severely restricted. For POS payment terminals, on the other hand, due to security regulations, visibility restrictions in mode B2 are often necessary in both horizontal and vertical directions.
  • Basically, the performance of the invention is maintained when the parameters described above are varied within certain limits.
  • It is understood that the features mentioned above and those yet to be explained below can be used not only in the specified combinations but also in other combinations or alone, without departing from the scope of the present invention.
  • The invention will be explained in more detail below with reference to drawings, which also show features essential to the invention. It shows
  • 1 a schematic diagram for the extraction of light, which is laterally coupled into an optical waveguide, in a large solid angle,
  • 2 a schematic diagram for the passage of light, which results from a backlight, through a light guide,
  • 3 a schematic diagram of the screen according to the invention of the operating mode B2 for a limited viewing mode, in which the image display unit is illuminated with limited in solid angle light, wherein the modulated by the image display unit light of light from a light guide 3 is superimposed to enhance the privacy effect,
  • 4 a schematic diagram of the screen according to the invention in the mode B1 for a free viewing mode in which the image display unit is illuminated with unconstrained in solid angle light, wherein the modulated by the image display unit light is not from light from a light guide 3 is superimposed,
  • 5 a schematic diagram of an advantageous embodiment of a backlight 2 , shown here for operating mode B1 for a free viewing mode,
  • 6 a schematic diagram of an advantageous embodiment of a backlight 2 , shown here for the operating mode B2 for a restricted viewing mode, as well
  • 7 a schematic diagram of another embodiment of the screen according to the invention in the operating mode B2 for a limited viewing mode in which the image display unit is illuminated with limited in solid angle light, wherein the modulated by the image display unit light is superimposed by light, which originates from a spatially spaced light source and from the screen surface is reflected back into the viewing space to enhance the privacy effect.
  • The drawings are not true to scale and represent only schematic representations (usually sectional representations) again.
  • In 1 is a schematic diagram for the extraction of light, the side of bulbs 4 in a light guide 3 - shown here only as a small section in sectional view - coupled, is shown in a large solid angle. The small dots stylize scattering particles as scattering centers for the light, which laterally from the bulbs 4 is coupled. Due to total reflection, rays of the coupled-in light (bold lines) on the outer wall are returned to the light guide 3 thrown until they finally hit a scattering article to the desired coupling. The decoupling is stylized by a multitude of thin rays. The representation in 1 is highly stylized for better visibility; in reality there is a very large number of beam paths in the light guide 3 implemented.
  • 2 shows a schematic diagram for the passage of light from a (not graphically illustrated) backlight 2 due to a light guide 3 , The scattering particles play thereby a substantially negligible role, since the light from the backlight 2 derives, ie not laterally through a narrow side of bulbs 4 is coupled and therefore not or hardly by total reflection in the light guide 3 is directed back and forth.
  • 3 gives a schematic diagram of the screen according to the invention 1 in the operating mode B2 for a limited viewing mode again, in which the image display unit 5 is illuminated with limited in solid angle light, with the through the image display unit 5 modulated light from light (shown here with dashed arrows) from one at a distance of at least 1 mm from the image display unit 5 arranged light guide 3 is superimposed to enhance the privacy effect. In the operating mode B2 are in the screen 1 So the following components are active:
    • - an arealwide backlight 2 , which in the operating mode B1 radiates light into a non-limited angular range for a free viewing mode, and that in the operating mode 62 for a limited viewing mode, emits light in a restricted angular range,
    • - one in viewing direction in front of the backlight 2 arranged transmissive image display unit 5 for example, an LCD panel,
    • - Illuminants 4 in the viewing direction outside the active image reproduction area of the image display unit 5 and at the same time at a distance of at least 1 millimeter above the image display unit 5 are arranged
    • A viewing direction in front of the image display unit 5 located, plate-shaped light guide 3 , which is made of a transparent, thermoplastic or thermoelastic plastic and dispersed therein scattering particles, is present, said lighting means 4 laterally on narrow sides of the light guide 3 are arranged, and wherein the light guide 3 at a distance of at least 1 millimeter above the image display unit 5 is located,
    • - whereby in the operating mode B1, at which the bulbs 4 off, that of the backlight 2 outgoing and then through the transmissive image display unit 5 penetrating light substantially unaffected by the light guide 3 passes through, and
    • - Which, in the mode B2, in which the bulbs 4 are turned on, that of the backlight 2 radiated into a restricted angular range and then through the transmissive image display unit 5 penetrating (with bold arrows in 3 superimposed) light is superimposed by light, which is the image display unit 5 due to the irradiation of light from the light guide 3 diffused and / or directed back into the viewing space or reflected (shown here with small arrows on dashed lines) and / or which (shown here with longer dashed lines) from the light guide 3 is radiated into the viewing space, so that the residual visibility of one on the transmissive image display unit 5 is reduced outside the said restricted angle range.
  • In contrast, shows 4 a schematic diagram of the screen according to the invention in the mode B1 for a free viewing mode in which the image display unit is illuminated with unrestricted in solid angle light (see bold arrows), wherein the modulated by the image display unit light is not from light from a light guide 3 is superimposed because the bulbs 4 are turned off. In the operating mode B1 are in the screen 1 So the following components are available:
    • - an arealwide backlight 2 which, in the operating mode B1, emits light in a non-limited angular range for a free viewing mode,
    • - one in viewing direction in front of the backlight 2 arranged transmissive image display unit 5 for example, an LCD panel or other translucent light modulator,
    • A viewing direction in front of the image display unit 5 located (ie away from the transmissive image display unit 5 ), plate-shaped light guide 3 which consists of a transparent, thermoplastic or thermoelastic plastic and scattering particles distributed therein, and
    • - Illuminants 4 , the side of narrow sides of the light guide 3 disposed
    • - In B1 mode, the bulbs 4 are turned off, so that by the backlight 2 outgoing and then through the transmissive image display unit 5 penetrating light substantially unaffected by the light guide 3 passes.
  • As a rule, the plate-shaped light guide has a haze <10%, preferably <4%, measured according to FIG ASTM D1003 on. Also suitable as scattering particles are, in particular, titanium dioxide particles. However, other embodiments are possible, for example with particles of barium sulfate, with silsesquioxane particles or with crosslinked polystyrene particles or other types of particles. The scattering particles are usually distributed homogeneously, whereby the light guide 3 does not have an inhomogeneous optical structure. Furthermore, the plate-shaped light guide contains 3 at least two opposing large surfaces, which are arranged parallel or inclined to each other. A wedge-shaped structure is possible, although parallel large areas are advantageous.
  • The extensive backlighting 2 can be formed, for example, as in the WO 2015/121398 proposed.
  • In addition shows 5 a schematic diagram for an advantageous Design of a backlight 2 , shown here for mode B1 for a clear view mode. According to shows 6 a schematic diagram of an advantageous embodiment of a backlight 2 , shown here for the operating mode B2 for a limited viewing mode. Such a backlight 2 For example, it consists of
    • - a flat radiator 2a , preferably as a light guide with laterally arranged bulbs 2 B is trained,
    • - At least one in the flat radiator 2a integrated and / or arranged in front of light collimator 2c (eg 2 crossed BEF foils, 2 crossed optical lighting films (OLF) type 2301 from 3M , and / or one or more privacy filters, eg Vikuiti from 3M ),
    • A viewing direction in front of the light collimator 2c arranged plate-shaped, transparent light guide 2d which consists of a transparent, thermoplastic or thermoelastic plastic and scattering particles distributed therein, as well as
    • - Lamps 2e , the side of narrow sides of the light guide 2d are arranged
    • - where in the in 5 illustrated operating mode B1 for a free field of view, at least the bulbs 2e , and here in the example also the flat radiator 2a are turned on (ie when the areal radiator 2a is designed as a light guide, of course, the bulbs 2 B of the flat radiator 2a switched on), and
    • - where in the in 6 illustrated mode B2 for a limited field of view, the lighting means 2e off and the surface radiator 2a are turned on (ie when the areal radiator 2a is designed as a light guide, also the bulbs 2 B switched on).
  • For the light guide 2d apply the above-mentioned design options to the light guide 3 analogous.
  • The light collimator 2c can be configured in various ways. As a rule, he will confine the light to a solid angle which is approximately to the left / right and / or up / down symmetrically about the perpendicular bisector of the image display unit 5 is distributed. Alternatively, it is also possible to use about one or more privacy filters whose slats are inclined. Thus, in the B2 mode, for a limited viewing mode, the solid angle would be within which the image display unit 5 Illustrates image information visible, according inclined to the perpendicular bisector of the image display unit 5 be aligned. This may be of interest, for example, if on the image display unit 5 Display image information to be visible at a time for two viewers who are located to the left and right in front of the screen 1, while at another time only one of the two viewers should see the image information.
  • The thick arrows on the bulbs 2 B and 2e such as 4 in the 3 . 5 and 6 indicate that they are turned on. The bulbs are preferably (cold) white luminous LED lines. Be advantageous as scattering particles in the transparent light guides 2d . 3 (possibly also 2 B ) Titanium dioxide particles having an average particle size of 150-500 nm used in a concentration based on the weight of the respective optical fiber of 0.01-300 ppm by weight.
  • It is also possible that the transparent light guides 2d . 3 (possibly also 2 B ) each consist of a matrix plastic A and scattering particles of a polymer B distributed therein, wherein the proportion of the scattering particles consisting of polymer B in each case 0.01 to 3 weight percent based on the matrix plastic A, and the refractive index nD (B) of the polymer B to at least 0.002 units above the refractive index nD (A) of the matrix plastic A.
  • Furthermore, it can bring benefits when on the top of the image display unit 5 and / or on at least one of the large surfaces of the light guide 3 Reflective means, such as an anti-glare and / or an anti-reflective coating, are arranged. In particular, an antiglare coating in connection with the invention not only serves to reduce direct reflections of external light spots, but rather also permits the scattered back reflection of the image reproduction unit 5 out of the light guide 3 radiated light.
  • An above-described, areally extended backlight 2 While, in most known B2 mode configurations for a limited viewing mode, it does emit light into a limited angular range, this directional selection is far from complete, resulting in being on a transmissive image display unit 5 even from an oblique view, the image content can still be completely or largely recognizable before such a backlighting, albeit with low brightness and / or with a weak light-dark contrast. This still possible oblique view is completely or almost completely eliminated on the basis of the invention: because in the operating mode B2, the lighting means 4 are turned on, that of the backlight 2 radiated into a restricted angular range and then through the transmissive image display unit 5 light is superimposed by light which transmits the image display unit 5 due to the irradiation of light from the bulbs 4 diffused and / or directed back into the viewing space or -reflektiert, whereby the residual visibility of a on the transmissive image display unit 5 is reduced outside of said restricted angular range or in other embodiments will that of the backlight 2 radiated into a restricted angular range and then through the transmissive image display unit 5 penetrating light is superimposed by light, which is the image display unit 5 due to the irradiation of light from the light guide 3 diffused and / or directed back into the viewing space or - reflected and / or which of the light guide 3 is radiated into the viewing space, so that the residual visibility of one on the transmissive image display unit 5 is reduced outside the said restricted angle range.
  • Finally shows 7 the schematic diagram of another embodiment of the screen according to the invention 1 in the operating mode B2 for a limited viewing mode in which the image display unit 5 illuminated with solid angle limited light (see bold arrows), which is through the image display unit 5 modulated light is superimposed by light from a spatially-spaced light source 4 (see thick arrow on the bulbs 4 ) and is reflected back from the screen surface into the viewing space (indicated by dashed line arrows) to enhance the privacy effect.
  • A practically very helpful application of in 7 embodiment shown would be exemplary of this:
    In a passenger car, a screen is on the passenger side 1 arranged to display navigation, entertainment and other data. In important for the driver data, such as navigation, the inventively designed screen would 1 in the operating mode B1 for a clear view mode, so that driver and front passenger can see the data. However, if the screen is used as an entertainment medium for the passenger, the presentation could distract the driver. So here's the screen 1 preferably switched to the operating mode B2 for a limited viewing angle, so that the driver as possible, nothing on the screen 1 can recognize and thus is not distracted from driving. In accordance with the invention possible residual visibility of image information on the image display unit 5 to exclude, is now one or more bulbs 4 , preferably white LEDs, available. In the vehicle, these z. B. be installed in the passenger door. These bulbs 4 are turned on according to the invention for the mode B2 and then illuminate from some distance from the side of the image display unit 5 , As a result, the residual visibility on the image display unit becomes 5 completely or at least almost completely excluded for the driver, as described above by the image display unit 5 reflected light from the image display unit 5 still superimposed in the direction of the driver outgoing light and thus outshined. The bulbs preferably have 4 via means for focusing, such as simple lenses in front of the LEDs, and a corresponding Abdeckblende, so that none of the passengers driving directly illuminated and thus inconveniently irradiated. In the best case, this is from the bulbs 4 outgoing light almost exclusively on the image display unit 5 ,
  • The method according to the invention can be explained analogously with reference to the drawings. For redundancy reasons, therefore, the description is not repeated here.
  • Both the above-described screen according to the invention and the method according to the invention make it possible to implement solutions which can be implemented well in order to reliably display information through an optionally restricted viewing angle, while in a further operating mode a free, as far as possible unobstructed viewing angle is possible. The invention can be realized inexpensively by simple means. In both modes, the native resolution of the image display unit used can be used. In addition, only a small or depending on the embodiment even no loss of light will be introduced through the solution.
  • The invention described above can advantageously be applied everywhere where confidential data is displayed and / or input, such as PIN entry or data display at ATMs or payment terminals or for password entry or reading emails on mobile devices.
  • In contrast to designs in the prior art, in which usually still a residual visibility is also available from oblique angles, the invention allows, depending on the configuration, the complete extinction of the residual visibility from blocked viewing angles.
  • LIST OF REFERENCE NUMBERS
  • B1
    Operating mode for a free viewing mode
    B2
    Operating mode for a restricted viewing mode
    1
    screen
    2
    Backlight
    2a
    Flat radiator
    2 B
    Lamp
    2c
    light collimator
    2d
    plate-shaped light guide
    2e
    Lamp
    3
    plate-shaped light guide
    4
    Lamp
    5
    transmissive image display unit
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • US 6765550 [0003]
    • US 5993940 [0004]
    • WO 2012/033583 [0005]
    • US 2009/0067156 [0006, 0007, 0008]
    • US 2012/0235891 [0009, 0009]
    • JP 2007-155783 [0010]
    • GB 2428128 A [0011]
    • US 2013/0308185 [0012, 0021, 0035]
    • DE 102014003298 A1 [0013]
    • WO 2015/121398 [0021, 0035, 0062]
  • Cited non-patent literature
    • ASTM D1003 [0025]
    • ASTM D1003 [0035]
    • ASTM D1003 [0041]
    • ASTM D1003 [0061]

Claims (10)

  1. Screen ( 1 ), which can be operated in at least two operating modes B1 for a free viewing mode and B2 for a restricted viewing mode, comprising - an areally extended backlighting ( 2 ), which emits light in an unrestricted angle range in the operating mode B1 for a free viewing mode and which, in the operating mode B2, transmits light in a restricted angular range for a restricted viewing mode, one in the viewing direction in front of the backlight ( 2 ) arranged transmissive image display unit ( 5 ), for example an LCD panel, - illuminant ( 4 ) viewed in the viewing direction outside the active image reproduction area of the image display unit (FIG. 5 ) and at the same time at a distance of at least 1 millimeter above the image display unit ( 5 ) are arranged, - wherein in the operating mode B1, the lighting means ( 4 ) are turned off so that the backlight ( 2 ) and then through the transmissive image display unit ( 5 ) penetrating light from the bulbs ( 4 ) is unaffected, and - wherein in B2 mode the bulbs ( 4 ) are switched on, so that the of the backlight ( 2 ) radiated in a restricted angular range and then by the transmissive image display unit ( 5 is superimposed by light penetrating light, which the image display unit ( 5 ) due to the irradiation of light from the bulbs ( 4 ) is diffused and / or directed back into the viewing space or reflecting, whereby the residual visibility of a on the transmissive image display unit ( 5 ) is reduced outside the said restricted angular range.
  2. Screen ( 1 ) according to claim 1, characterized in that further in the viewing direction in front of the image display unit ( 5 ) located, plate-shaped light guide ( 3 ), which consists of a transparent, thermoplastic or thermoelastic plastic and dispersed therein scattering particles, is present, said light sources ( 4 ) laterally on narrow sides of the light guide ( 3 ) are arranged, and wherein the optical fiber ( 3 ) at a distance of at least 1 millimeter above the image display unit ( 5 ) is located, - whereby in the operating mode B1, in which the lighting means ( 4 ) are turned off by the backlight ( 2 ) and then through the transmissive image display unit ( 5 ) penetrating light substantially unaffected by the light guide ( 3 ), and - whereby in the operating mode B2, in which the lighting means ( 4 ) are turned on by the backlight ( 2 ) radiated in a restricted angular range and then by the transmissive image display unit ( 5 is superimposed by light penetrating light, which the image display unit ( 5 ) due to the irradiation of light from the light guide ( 3 ) diffused and / or directed back into the viewing space or reflected and / or which of the light guide ( 3 ) is radiated into the viewing space, so that the residual visibility of one on the transmissive image display unit ( 5 ) is reduced outside the said restricted angular range.
  3. Screen ( 1 ) according to one of the preceding claims, characterized in that the backlight ( 2 ) consists of - a flat radiator ( 2a ), preferably a light guide with laterally arranged light sources ( 2 B ), - at least one in the flat radiator ( 2a ) integrated and / or arranged in front of light collimator ( 2c ), - a viewing direction in front of the light collimator ( 2c ) arranged plate-shaped, transparent light guide ( 2d ), which consists of a transparent, thermoplastic or thermoelastic plastic and scattering particles distributed therein, and - illuminants ( 2e ), which laterally on narrow sides of the light guide ( 2d ) are arranged, - wherein in the operating mode B1 for a free field of view at least the lighting means ( 2e ), and optionally also the flat radiator ( 2a ) are turned on, and - wherein in the mode 82 for a limited field of view the bulbs ( 2e ) and the flat radiator ( 2a ) are turned on.
  4. Screen ( 1 ) according to one of the preceding claims, characterized in that as scattering particles in the transparent light guides ( 2d and or 3 ) Titanium dioxide particles having an average particle size of 150-500 nm in a concentration based on the weight of the respective optical fiber of 0.01-300 ppm by weight.
  5. Screen ( 1 ) according to one of claims 1, 2 or 3, characterized in that the transparent light guides ( 2d and or 3 ) each consist of a matrix plastic A and scattering particles of a polymer B distributed therein, wherein the proportion of the scattering particles consisting of polymer B in each case 0.01 to 3 weight percent based on the matrix plastic A, and the refractive index nD (B) of the polymer B to is at least 0.01 units above the refractive index nD (A) of the matrix plastic A.
  6. Screen ( 1 ) according to one of the preceding claims, characterized in that on the upper side of the image display unit ( 5 ) and / or on at least one of the large surfaces of the light guide ( 3 ) Means for reflection reduction, for example, an anti-glare and / or an anti-reflection coating, are arranged.
  7. Screen ( 1 ) according to one of the preceding claims, characterized in that at least the lighting means ( 2e and or 4 ) LEDs or laser diodes are.
  8. Using a screen ( 1 ) according to one of claims 1 to 6 for the input or display of confidential data, for example PIN PIN numbers, e-mails, SMS or passwords, ATMs, payment terminals or mobile devices.
  9. Method for displaying image information ( 6 ) in at least two operating modes B1 for a free viewing mode and B2 for a restricted viewing mode, comprising the following steps: - for the operating mode B1: areal radiation of light in a non-restricted angle range for a free viewing mode, preferably of a planar-extended backlight ( 2 ), or alternatively - for the operating mode B2: areal emission of light in a restricted angular range for a restricted viewing mode, preferably of a planarly extended backlight ( 2 ), - Modulation of the surface radiated light by means of a transmissive image display unit ( 5 ) to this light image information ( 6 ), - providing illuminants ( 4 ) viewed in the viewing direction outside the active image reproduction area of the image display unit (FIG. 5 ) and at the same time at a distance of at least 1 millimeter above the image display unit ( 5 ) are arranged, - for the operating mode B1: switching off the lighting means ( 4 ), so that from the backlight ( 2 ) and then through the transmissive image display unit ( 5 ) penetrating light from the bulbs ( 4 ) is unaffected, and - for mode B2: switching on the lamps ( 4 ), so that from the backlight ( 2 ) radiated in a restricted angular range and then by the transmissive image display unit ( 5 is superimposed by light penetrating light, which the image display unit ( 5 ) due to the irradiation of light from the bulbs ( 4 ) scattered and / or reflected back into the viewing space or reflecting, whereby the residual visibility of the on the transmissive image display unit ( 5 ) image information ( 6 ) is reduced outside said restricted angle range.
  10. Method for displaying image information ( 6 ) in at least two operating modes B1 for a free viewing mode and B2 for a restricted viewing mode, comprising the following steps: - for the operating mode B1: areal radiation of light in a non-restricted angle range for a free viewing mode, preferably of a planar-extended backlight ( 2 ), or alternatively - for the operating mode B2: areal emission of light in a restricted angular range for a restricted viewing mode, preferably of a planarly extended backlight ( 2 ), - Modulation of the surface radiated light by means of a transmissive image display unit ( 5 ) to this light image information ( 6 ), - passing the thus modulated light through a plate-shaped light guide ( 3 ), which consists of a transparent, thermoplastic or thermoelastic plastic and dispersed therein scattering particles, wherein the optical fiber ( 3 ) at a distance of at least 1 millimeter above the image display unit ( 5 ) is arranged and on the narrow sides of the light guide ( 3 ) Illuminants ( 4 ) are arranged laterally, - for the operating mode B1: switching off the lamps ( 4 ), so that from the backlight ( 2 ) and then through the transmissive image display unit ( 5 ) penetrating light substantially unaffected by the light guide ( 3 ), and - for the operating mode B2: switching on the lighting means ( 4 ), so that from the backlight ( 2 ) radiated in a restricted angular range and then by the transmissive image display unit ( 5 is superimposed by light penetrating light, which the image display unit ( 5 ) due to the irradiation of light from the light guide ( 3 ) diffused and / or directed back into the viewing space or reflected and / or which of the light guide ( 3 ) is radiated into the viewing space, so that the residual visibility of the on the transmissive image display unit ( 5 ) image information ( 6 ) is reduced outside said restricted angle range.
DE102016003627.3A 2016-03-22 2016-03-22 Screen and procedure for a free and a restricted view mode Pending DE102016003627A1 (en)

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Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
DE102016003627.3A DE102016003627A1 (en) 2016-03-22 2016-03-22 Screen and procedure for a free and a restricted view mode
US15/778,105 US10241355B2 (en) 2015-11-27 2016-11-24 Screen for a free and restricted operating mode
CN201910688435.2A CN110412781A (en) 2015-11-27 2016-11-24 Display screen for free running mode and the limited method of operation
CN201680069467.9A CN108292062A (en) 2015-11-27 2016-11-24 Display screen for free running mode and the limited method of operation
PCT/EP2016/078711 WO2017089482A1 (en) 2015-11-27 2016-11-24 Screen for a free and restricted operating mode
EP19178797.7A EP3570097A1 (en) 2015-11-27 2016-11-24 Display screen with operational modes for a free and a restriced view
KR1020187013893A KR101956522B1 (en) 2015-11-27 2016-11-24 Screen for free and limited operating mode
EP16804733.0A EP3347765B1 (en) 2015-11-27 2016-11-24 Display screen with operational modes for a free and a restricted view
JP2018527200A JP6487606B2 (en) 2015-11-27 2016-11-24 Screen for free and limited operation modes
JP2018238348A JP6553280B2 (en) 2015-11-27 2018-12-20 Screen for free and limited operation modes

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