WO2009040698A1 - A display device comprising a background screen - Google Patents
A display device comprising a background screen Download PDFInfo
- Publication number
- WO2009040698A1 WO2009040698A1 PCT/IB2008/053724 IB2008053724W WO2009040698A1 WO 2009040698 A1 WO2009040698 A1 WO 2009040698A1 IB 2008053724 W IB2008053724 W IB 2008053724W WO 2009040698 A1 WO2009040698 A1 WO 2009040698A1
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- WO
- WIPO (PCT)
- Prior art keywords
- display device
- background screen
- region
- viewer
- image display
- Prior art date
Links
- 238000005286 illumination Methods 0.000 claims abstract description 12
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- -1 acryl Chemical group 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 239000004984 smart glass Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 5
- 230000001795 light effect Effects 0.000 description 4
- 150000004678 hydrides Chemical class 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
Definitions
- the present invention relates to a display device comprising a background screen, and to a display device assembly.
- WO 2005/062608 discloses a supplementary visual display system for use in conjunction with a display device.
- a visual display system is today often referred to as ambilight system.
- Such ambilight systems have entered the market in the recent year in flat screen TVs, where two or more light sources are arranged at the sides/tops of the display device and are used for emitting light on the wall behind the TV that matches the video being shown. The effect is larger virtual screen and a more immersive viewing experience.
- the object of the present invention is to enhance the variety of where to place TV's and other display devices being associated with such light sources without loosing the effect produced by the light sources.
- the present invention relates to display device comprising an image display region for presenting images to a viewer and one or more light sources disposed in a pre-fixed arrangement in relation to the periphery of the image display region adapted to project illumination radiated therefrom so as to illuminate a region visually appearing to the viewer to at least partially peripherally surround the image display region, wherein the display device further comprises a background screen adapted to be switched between at least an opaque state and a transparent state, the opaque state being adapted to be used for providing a reflective background for the illumination radiated therefrom.
- the background screen can be selected as reflective when desired, e.g. when it is not located in front of a wall, or when the device is not in use, or when the ambilight effect produced by the light sources is not desired.
- the background screen is made of a material selected from: - an electronic smart glass where the light transmission properties of the glass are changed by applying a voltage over the glass or by changing the temperature of the glass, an electrically switchable plastic where the light transmission properties of the plastic are changed by applying a voltage over the plastic, acryl, - polycarbonate, polymer dispersed liquid crystals (PDLCs) where the light transmission properties are changed by applying voltage over the PDLCs, hydrides by injecting hydrogen into a metal from a gas or solid state, and liquid crystals.
- the background screen is adapted to be coupled to a voltage source for electrically switching the background screen between the opaque state and the transparent state.
- the voltage source is activated or deactivated via a remote control. Therefore, a very user friendly way is provided for allowing the user to switch between the opaque state and a transparent state.
- the present invention relates to a display device comprising an image display region for presenting images to a viewer and one or more light sources disposed in a pre-fixed arrangement in relation to the periphery of the image display region, wherein the display device comprises said background screen.
- the display device is selected from:
- Plasma display TVs or monitors surface-conduction electron-emitter display TVs or monitors (SED), - laser TVs or monitors, organic light-emitting diode TVs or monitors (OLED), film projectors, and digital projectors.
- the operation mode of the display device is coupled to the operation mode of the background screen.
- the switch off mode of the display device corresponds to a transparent state mode of the background screen. It follows that when the display device is not in use the background screen is automatically switched to a transparent state mode. Thus, the display device appears as less space demanding and less visible when not in use.
- the device further comprises a distance detector for detecting the distance between the display device and the region visually appearing to the viewer where in case the distance is above a pre-defined threshold value the background screen is automatically switched to an opaque state.
- the present invention relates to a display device assembly comprising: display device comprising an image display region for presenting images to a viewer and one or more light sources disposed in a pre-f ⁇ xed arrangement in relation to the periphery of the image display region adapted to project illumination radiated therefrom so as to illuminate a region visually appearing to the viewer to at least partially peripherally surround the image display region, and a background screen adapted to be switched between at least an opaque state and a transparent state, the opaque state being adapted to be used for providing a reflective background for the illumination radiated therefrom.
- the aspects of the present invention may each be combined with any of the other aspects.
- Fig. 1 shows a display device comprising an image display region for presenting images to a viewer and one or more light sources disposed in a pre-fixed arrangement in relation to the periphery of the image display region
- Fig. 2 shows the display device shown in Fig. 1 with a background screen according to the present invention
- Figs. 3 and 4 show a side view of the display device shown in Figs. 1 and 2, where the background screen is shown in an opaque state and a transparent state.
- Fig. 5 shows an embodiment of a display device with a distance detector.
- Fig. 1 shows a display device 101 comprising an image display region 102 for presenting images to a viewer 104 and one or more light sources 103 disposed in a pre-f ⁇ xed arrangement in relation to the periphery of the image display region 102.
- the light sources 103 are adapted to project illumination radiated 105 so as to illuminate a region visually appearing to the viewer 104 so as to at least partially peripherally surround the image display region.
- the image display device 101 may be Liquid crystal TVs or monitors (LCT), Plasma display TVs or monitors, surface-conduction electron-emitter display TVs or monitors (SED), laser TVs or monitors, organic light-emitting diode TVs or monitors (OLED), film projectors, and digital projectors, and the like.
- LCD Liquid crystal TVs or monitors
- SED surface-conduction electron-emitter display TVs or monitors
- laser TVs or monitors laser TVs or monitors
- OLED organic light-emitting diode TVs or monitors
- film projectors and digital projectors, and the like.
- TVs having such one or more light sources 103 disposed in a pre-f ⁇ xed arrangement in relation to the periphery of the image display region are often referred as ambilight or ambilight TV's.
- the aim of implementing these light sources for irradiating the surroundings of the TVs (display devices) is to generate light effects around the TVs that match the video contents. The effect is a virtual larger screen and a more immersive viewing experience.
- An example of such a display device using such extra light sources for emitting ambience light is disclosed in WO2005/062608, hereby incorporated as whole by reference.
- a background or a wall is needed to reflect the light emitted by the light sources 103.
- the display device 101 is either attached to a wall, or located close to a wall (background) such that the wall acts as a scattering background.
- the display device controller (not shown) is also the controller for the background screen 100 controlling the different states of the screen.
- the switch off mode of the display device 101 acts as a switch to "transparent state mode" for the background screen 100. This may work such that when switching the display device 101 to a switch off mode (e.g. via a remote control) a command is issued instructing the operation means (not shown), e.g. a processing unit, that operates the background screen to switch the background screen to transparent state mode. This may be done e.g. via changing the voltage over the screen, or changing the screen temperature or adding/removing hydrogen into/from the screen etc.. Therefore, when the viewer 104 switches off the TV as an example, the background screen 100 is automatically switched to a transparent state. Therefore, the background screen 100 is no longer visible to the viewer 104 when the display device is not in use.
- Fig. 2 shows the display device 101 shown in Fig. 1 with a background screen 100 according to the present invention.
- the background screen 100 is adapted to be switched between at least an opaque state and a transparent state and even one or more intermediate states.
- the opaque state as shown in Fig. 2 is adapted to be used for providing a reflective background for the light 105 emitted by the light sources 103 in scenarios where the display device is placed in such a distance away from a reflective surface that it can no longer act as a reflective surface. Un such situations, e.g. if an ambilight TV is located to far away from a wall, the opaque state of the background screen 100 acts as a reflective surface.
- the display device 101 can be placed anywhere without jeopardizing loosing the ambience light effects produced by the light sources, and also the viewer 105 can choose when the ambience light effects is desired or not by simply switching off the opaque state.
- the switching off the opaque state can also be done when the display device 101 is not in use. This results among other things in that the display device appears as if it is less space demanding and less visible.
- Other intermediate, e.g. semi transparent/opaque state states may just as well be possible, depending on the type of material used in the screen 100.
- the background screen may as an example be made of a material selected from: an electronic smart glass where the light transmission properties of the glass are changed from opaque state to transparent state or vice verse by applying a voltage over the glass or by changing the temperature of the glass, an electrically switchable plastic where the light transmission properties of the plastic are changed by applying a voltage over the plastic, acryl, polycarbonate, polymer dispersed liquid crystals (PDLCs) where the light transmission properties are changed by applying voltage over the PDLCs, hydrides by injecting hydrogen into a metal from a gas or solid state, and liquid crystals.
- the screen may be adapted to be coupled to a voltage source for electrically switching the background screen between the opaque state and the transparent state.
- the voltage source is activated or deactivated via a remote control.
- Fig. 1 might as an example illustrate a scenario where the user of the display device 101 has mounted the display device to a wall and switched the background screen 100 (not visible) to a transparent state.
- Figs. 3 and 4 show a side view of the display devices shown in Figs. 1 and 2.
- the background screen 100 is shown in an opaque state (the scenario in Fig. 2)
- the background screen 100 is shown in a transparent state (the scenario in Fig. 1).
- Fig. 5 shows an embodiment of a display device 101 shown Figs. 1-4, where the display device 101 further comprises a distance detector 106 for detecting the distance 108 between the display device 101 and the region visually appearing to the viewer 104, e.g. a wall 107.
- the distance is above a pre-defined threshold value, e.g. more than 25cm, the background screen 100 is automatically switched to an opaque state.
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Abstract
This invention relates to a display device having an image display region for presenting images to a viewer and one or more light sources disposed in a pre-fixed arrangement in relation to the periphery of the image display region. The light sources are adapted to project illumination radiated therefrom to illuminate a region visually appearing to the viewer to at least partially peripherally surround the image display region. The display device further contains a background screen that is adapted to be switched between at least an opaque state and a transparent state. The opaque state is adapted to be used for providing a reflective background for the illumination radiated.
Description
A display device comprising a background screen
FIELD OF THE INVENTION
The present invention relates to a display device comprising a background screen, and to a display device assembly.
BACKGROUND OF THE INVENTION
WO 2005/062608 discloses a supplementary visual display system for use in conjunction with a display device. Such a visual display system is today often referred to as ambilight system. Such ambilight systems have entered the market in the recent year in flat screen TVs, where two or more light sources are arranged at the sides/tops of the display device and are used for emitting light on the wall behind the TV that matches the video being shown. The effect is larger virtual screen and a more immersive viewing experience.
However, this requires that the TV's are either hanging on the wall, or are placed close to a reflective background such as walls.
BRIEF DESCRIPTION OF THE INVENTION
The object of the present invention is to enhance the variety of where to place TV's and other display devices being associated with such light sources without loosing the effect produced by the light sources.
According to one aspect the present invention relates to display device comprising an image display region for presenting images to a viewer and one or more light sources disposed in a pre-fixed arrangement in relation to the periphery of the image display region adapted to project illumination radiated therefrom so as to illuminate a region visually appearing to the viewer to at least partially peripherally surround the image display region, wherein the display device further comprises a background screen adapted to be switched between at least an opaque state and a transparent state, the opaque state being adapted to be used for providing a reflective background for the illumination radiated therefrom.
Accordingly, since such a reflective background is provided it is now possible to place the display device anywhere without loosing the effect produced by the light sources. Additionally, the background screen can be selected as reflective when desired, e.g. when it
is not located in front of a wall, or when the device is not in use, or when the ambilight effect produced by the light sources is not desired.
In one embodiment, the background screen is made of a material selected from: - an electronic smart glass where the light transmission properties of the glass are changed by applying a voltage over the glass or by changing the temperature of the glass, an electrically switchable plastic where the light transmission properties of the plastic are changed by applying a voltage over the plastic, acryl, - polycarbonate, polymer dispersed liquid crystals (PDLCs) where the light transmission properties are changed by applying voltage over the PDLCs, hydrides by injecting hydrogen into a metal from a gas or solid state, and liquid crystals. In one embodiment, the background screen is adapted to be coupled to a voltage source for electrically switching the background screen between the opaque state and the transparent state.
In one embodiment, the voltage source is activated or deactivated via a remote control. Therefore, a very user friendly way is provided for allowing the user to switch between the opaque state and a transparent state.
According to another aspect, the present invention relates to a display device comprising an image display region for presenting images to a viewer and one or more light sources disposed in a pre-fixed arrangement in relation to the periphery of the image display region, wherein the display device comprises said background screen.
In one embodiment, the display device is selected from:
Liquid crystal TVs or monitors (LCT),
Plasma display TVs or monitors, surface-conduction electron-emitter display TVs or monitors (SED), - laser TVs or monitors, organic light-emitting diode TVs or monitors (OLED), film projectors, and digital projectors.
In one embodiment, the operation mode of the display device is coupled to the operation mode of the background screen.
In one embodiment, the switch off mode of the display device corresponds to a transparent state mode of the background screen. It follows that when the display device is not in use the background screen is automatically switched to a transparent state mode. Thus, the display device appears as less space demanding and less visible when not in use.
In one embodiment, the device further comprises a distance detector for detecting the distance between the display device and the region visually appearing to the viewer where in case the distance is above a pre-defined threshold value the background screen is automatically switched to an opaque state.
In that way, the display device detects automatically when the opaque state is preferred and when not. Thus, the viewer does no longer have to manually check whether switching on to the opaque state is preferred or not. According to another aspect, the present invention relates to a display device assembly comprising: display device comprising an image display region for presenting images to a viewer and one or more light sources disposed in a pre-fϊxed arrangement in relation to the periphery of the image display region adapted to project illumination radiated therefrom so as to illuminate a region visually appearing to the viewer to at least partially peripherally surround the image display region, and a background screen adapted to be switched between at least an opaque state and a transparent state, the opaque state being adapted to be used for providing a reflective background for the illumination radiated therefrom. The aspects of the present invention may each be combined with any of the other aspects. These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS Embodiments of the invention will be described, by way of example only, with reference to the drawings, in which
Fig. 1 shows a display device comprising an image display region for presenting images to a viewer and one or more light sources disposed in a pre-fixed arrangement in relation to the periphery of the image display region,
Fig. 2 shows the display device shown in Fig. 1 with a background screen according to the present invention,
Figs. 3 and 4 show a side view of the display device shown in Figs. 1 and 2, where the background screen is shown in an opaque state and a transparent state. Fig. 5 shows an embodiment of a display device with a distance detector.
DESCRIPTION OF EMBODIMENTS
Fig. 1 shows a display device 101 comprising an image display region 102 for presenting images to a viewer 104 and one or more light sources 103 disposed in a pre-fϊxed arrangement in relation to the periphery of the image display region 102. As depicted here, the light sources 103 are adapted to project illumination radiated 105 so as to illuminate a region visually appearing to the viewer 104 so as to at least partially peripherally surround the image display region.
The image display device 101 may be Liquid crystal TVs or monitors (LCT), Plasma display TVs or monitors, surface-conduction electron-emitter display TVs or monitors (SED), laser TVs or monitors, organic light-emitting diode TVs or monitors (OLED), film projectors, and digital projectors, and the like.
TVs having such one or more light sources 103 disposed in a pre-fϊxed arrangement in relation to the periphery of the image display region are often referred as ambilight or ambilight TV's. The aim of implementing these light sources for irradiating the surroundings of the TVs (display devices) is to generate light effects around the TVs that match the video contents. The effect is a virtual larger screen and a more immersive viewing experience. An example of such a display device using such extra light sources for emitting ambience light is disclosed in WO2005/062608, hereby incorporated as whole by reference. In order to bring out this light effect produced by the illumination radiated 105, a background or a wall is needed to reflect the light emitted by the light sources 103. In the scenario shown in Fig. 1, the display device 101 is either attached to a wall, or located close to a wall (background) such that the wall acts as a scattering background.
In one embodiment, the display device controller (not shown) is also the controller for the background screen 100 controlling the different states of the screen. In one embodiment, the switch off mode of the display device 101 acts as a switch to "transparent state mode" for the background screen 100. This may work such that when switching the display device 101 to a switch off mode (e.g. via a remote control) a command is issued instructing the operation means (not shown), e.g. a processing unit, that operates the
background screen to switch the background screen to transparent state mode. This may be done e.g. via changing the voltage over the screen, or changing the screen temperature or adding/removing hydrogen into/from the screen etc.. Therefore, when the viewer 104 switches off the TV as an example, the background screen 100 is automatically switched to a transparent state. Therefore, the background screen 100 is no longer visible to the viewer 104 when the display device is not in use.
Fig. 2 shows the display device 101 shown in Fig. 1 with a background screen 100 according to the present invention. The background screen 100 is adapted to be switched between at least an opaque state and a transparent state and even one or more intermediate states. The opaque state as shown in Fig. 2 is adapted to be used for providing a reflective background for the light 105 emitted by the light sources 103 in scenarios where the display device is placed in such a distance away from a reflective surface that it can no longer act as a reflective surface. Un such situations, e.g. if an ambilight TV is located to far away from a wall, the opaque state of the background screen 100 acts as a reflective surface. Thus, the display device 101 can be placed anywhere without jeopardizing loosing the ambience light effects produced by the light sources, and also the viewer 105 can choose when the ambience light effects is desired or not by simply switching off the opaque state. The switching off the opaque state can also be done when the display device 101 is not in use. This results among other things in that the display device appears as if it is less space demanding and less visible. Other intermediate, e.g. semi transparent/opaque state states may just as well be possible, depending on the type of material used in the screen 100.
The background screen may as an example be made of a material selected from: an electronic smart glass where the light transmission properties of the glass are changed from opaque state to transparent state or vice verse by applying a voltage over the glass or by changing the temperature of the glass, an electrically switchable plastic where the light transmission properties of the plastic are changed by applying a voltage over the plastic, acryl, polycarbonate, polymer dispersed liquid crystals (PDLCs) where the light transmission properties are changed by applying voltage over the PDLCs, hydrides by injecting hydrogen into a metal from a gas or solid state, and liquid crystals. The screen may be adapted to be coupled to a voltage source for electrically switching the background screen between the opaque state and the transparent state. In one embodiment, the voltage source is activated or deactivated via a remote control. In that way, the user or viewer 104 of the display device 101 can remotely select between the two or more states. Fig. 1 might as an example illustrate a scenario where the user of the display device
101 has mounted the display device to a wall and switched the background screen 100 (not visible) to a transparent state.
Figs. 3 and 4 show a side view of the display devices shown in Figs. 1 and 2. In Fig. 3 the background screen 100 is shown in an opaque state (the scenario in Fig. 2), and in Fig. 4 the background screen 100 is shown in a transparent state (the scenario in Fig. 1). Fig. 5 shows an embodiment of a display device 101 shown Figs. 1-4, where the display device 101 further comprises a distance detector 106 for detecting the distance 108 between the display device 101 and the region visually appearing to the viewer 104, e.g. a wall 107. In case the distance is above a pre-defined threshold value, e.g. more than 25cm, the background screen 100 is automatically switched to an opaque state.
Certain specific details of the disclosed embodiment are set forth for purposes of explanation rather than limitation, so as to provide a clear and thorough understanding of the present invention. However, it should be understood by those skilled in this art, that the present invention might be practiced in other embodiments that do not conform exactly to the details set forth herein, without departing significantly from the spirit and scope of this disclosure. Further, in this context, and for the purposes of brevity and clarity, detailed descriptions of well-known apparatuses, circuits and methodologies have been omitted so as to avoid unnecessary detail and possible confusion.
Reference signs are included in the claims, however the inclusion of the reference signs is only for clarity reasons and should not be construed as limiting the scope of the claims.
Claims
1. A display device (101) comprising an image display region (102) for presenting images to a viewer (104) and one or more light sources disposed in a pre-fϊxed arrangement in relation to the periphery of the image display region adapted to project illumination radiated (105) therefrom so as to illuminate a region visually appearing to the viewer (104) to at least partially peripherally surround the image display region, wherein the display device further comprises a background screen adapted to be switched between at least an opaque state and a transparent state, the opaque state being adapted to be used for providing a reflective background for the illumination radiated therefrom (104).
2. A display device according to claim 1, wherein the background screen (100) is made of a material selected from: an electronic smart glass where the light transmission properties of the glass are changed by applying a voltage over the glass or by changing the temperature of the glass, an electrically switchable plastic where the light transmission properties of the plastic are changed by applying a voltage over the plastic, acryl, polycarbonate, polymer dispersed liquid crystals (PDLCs) where the light transmission properties are changed by applying voltage over the PDLCs, - hydrides by injecting hydrogen into a metal from a gas or solid state, and liquid crystals.
3. A display device according to claim 1, wherein the background screen is adapted to be coupled to a voltage source for electrically switching the background screen between the opaque state and the transparent state.
4. A display device according to claim 3, wherein the voltage source is activated or deactivated via a remote control.
5. A display device according to claim 1, wherein the display device is selected from:
Liquid crystal TVs or monitors (LCT), Plasma display TVs or monitors, - surface-conduction electron-emitter display TVs or monitors (SED), laser TVs or monitors, organic light-emitting diode TVs or monitors (OLED), film projectors, and digital projectors.
6. A display device according to claim 1, wherein the operation mode of the display device (101) is coupled to the operation mode of the background screen (101).
7. A display device according to claim 6, wherein the switch off mode of the display device (101) corresponds to a transparent state mode of the background screen.
8. A display device according to claim 1, further comprising a distance detector (106) for detecting the distance between the display device and the region (107) visually appearing to the viewer (104) where in case the distance (108) is above a pre-defined threshold value the background screen (100) is automatically switched to an opaque state.
9. A display device assembly comprising: display device (101) comprising an image display region (102) for presenting images to a viewer (104) and one or more light sources disposed in a pre-fixed arrangement in relation to the periphery of the image display region adapted to project illumination radiated (105) therefrom so as to illuminate a region visually appearing to the viewer (104) to at least partially peripherally surround the image display region, and a background screen adapted to be switched between at least an opaque state and a transparent state, the opaque state being adapted to be used for providing a reflective background for the illumination radiated therefrom (104).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP07117016.1 | 2007-09-24 | ||
EP07117016 | 2007-09-24 |
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WO2009040698A1 true WO2009040698A1 (en) | 2009-04-02 |
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PCT/IB2008/053724 WO2009040698A1 (en) | 2007-09-24 | 2008-09-15 | A display device comprising a background screen |
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US9726968B2 (en) | 2014-10-27 | 2017-08-08 | Barco, Inc. | Display systems and methods employing screens with an array of micro-lenses or micro-mirrors |
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WO2022227226A1 (en) * | 2021-04-29 | 2022-11-03 | 太仓隆昇光电技术有限公司 | Dimmable backlight module and backlight display apparatus |
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