CN205405002U - Changeable peep -proof display device and backlight - Google Patents
Changeable peep -proof display device and backlight Download PDFInfo
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- CN205405002U CN205405002U CN201620157686.XU CN201620157686U CN205405002U CN 205405002 U CN205405002 U CN 205405002U CN 201620157686 U CN201620157686 U CN 201620157686U CN 205405002 U CN205405002 U CN 205405002U
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- 244000144985 peep Species 0.000 title abstract description 4
- 238000009792 diffusion process Methods 0.000 claims abstract description 54
- 230000000694 effects Effects 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims description 17
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 claims description 7
- 239000004973 liquid crystal related substance Substances 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 abstract description 14
- 239000010408 film Substances 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000011521 glass Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012788 optical film Substances 0.000 description 2
- 239000011449 brick Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a changeable peep -proof display device and backlight relates to the demonstration field, can realize narrow visual angle and wide viewing angle's switching, and with low costs. The utility model discloses a changeable peep -proof display device, include: the backlight that sets gradually, the optics spare that has collimation or centering focus effect, changeable diffusion piece and display panel, the backlight is used for doing display panel provides in a poor light, changeable diffusion piece can switch between transparent attitude and scattering attitude, when being in transparent attitude, changeable diffusion piece does not change the direction of propagation who is shaded, when being in the scattering attitude, changeable diffusion piece is right be shaded and carry out the scattering, obtain wide viewing angle and be shaded.
Description
Technical Field
The utility model relates to a show the field, especially relate to a changeable peep-proof display device and backlight.
Background
The existing peep-proof technology includes a glasses type technology and a naked eye type technology, the glasses type technology performs separation protection of confidential information through an external auxiliary device (such as auxiliary glasses), and the naked eye type technology realizes peep-proof through control of incident light angles. Meanwhile, technologies for switching between peep prevention and normal display are relatively few, and switching between wide and narrow viewing angles can be realized by using a director backlight technology, but the technology has extremely high requirements on manufacturing of a light guide plate and light bars (LEDlightingBar), and common backlight manufacturers are difficult to meet design requirements.
In addition, the 3M privacy film alone can only realize privacy display, and the 3M privacy film in combination with other auxiliary devices can realize switching between privacy display and normal display, but the 3M privacy film has high cost and great difficulty in mass production. Specifically, as shown in fig. 1, a light alignment film 12 and a switchable diffuser 13 are provided between the backlight unit 11 and the display panel 3, the switchable diffuser 13 is a PDLC (polymer dispersed liquid crystal) diffuser film, and the light alignment film 12 is a 3M privacy film. When the narrow viewing angle (peep-proof display) is achieved, the switchable diffusion sheet 13 is in a transparent state, the incident angle of the light passing through the light orientation film 12 is limited, and when the light passes through the switchable diffusion sheet 13, the switchable diffusion sheet 13 is in the transparent state, so that the incident direction of the limited incident light is still limited after the limited incident light passes through the switchable diffusion sheet 13, and the narrow viewing angle display can be achieved; when the switchable diffuser 13 is switched to the scattering state, the incident light is limited in incident angle after passing through the light-directing film 12, but the directed light is uniformly scattered after passing through the switchable diffuser 13, so that the incident light becomes uniform non-directed light, and the display screen becomes a non-narrow viewing angle screen (normal display). The disadvantage of this solution is that it is difficult to achieve mass production of the product because the 3M privacy film is too costly.
SUMMERY OF THE UTILITY MODEL
The utility model provides a changeable peep-proof display device and backlight can realize the switching of narrow visual angle and wide visual angle to it is with low costs.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:
the embodiment of the utility model provides a changeable peep-proof display device, include: the backlight source, the optical piece with collimation or focus effect to the center, the switchable diffusion sheet and the display panel are arranged in sequence; the backlight source is used for providing backlight for the display panel; the switchable diffusion sheet can be switched between a transparent state and a scattering state, and the transmission direction of the backlight is not changed by the switchable diffusion sheet when the switchable diffusion sheet is in the transparent state; and when the backlight module is in a scattering state, the switchable diffusion sheet scatters the backlight to obtain the wide-viewing-angle backlight.
Preferably, the optical element with collimation or focus towards the center is a fresnel lens.
Optionally, a smooth surface of the fresnel lens is opposite to a light exit surface of the backlight source, and the backlight source includes a light source, a light guide plate, and a diffusion sheet; or one surface of the Fresnel lens, on which the concentric circles are inscribed, is opposite to the light emergent surface of the backlight source, and the backlight source comprises a light source and a reflecting sheet, but does not comprise a light guide plate and a diffusion sheet.
Optionally, the switchable diffuser comprises: polymer dispersed liquid crystals or multistable liquid crystals.
Optionally, the optical member having a collimating or a focusing effect covers at least a display area of the display panel.
The embodiment of the utility model also provides a backlight source, which is suitable for a switchable peep-proof display device and comprises a backlight component, an optical component with collimation or focus towards the center and a switchable diffusion sheet which are arranged in sequence; the backlight assembly includes at least a light source for providing a backlight; the switchable diffusion sheet can be switched between a transparent state and a scattering state, and the transmission direction of the backlight is not changed by the switchable diffusion sheet when the switchable diffusion sheet is in the transparent state; and when the backlight module is in a scattering state, the switchable diffusion sheet scatters the backlight to obtain the wide-viewing-angle backlight.
Preferably, the optical element with collimation or focus towards the center is a fresnel lens.
Optionally, a smooth surface of the fresnel lens is opposite to a light exit surface of the backlight component, and the backlight component includes a light source, a light guide plate and a diffusion sheet; or one surface of the Fresnel lens, on which the concentric circles are inscribed, is opposite to the light-emitting surface of the backlight component, and the backlight component comprises a light source and a reflecting sheet and does not comprise a light guide plate and a diffusion sheet.
Optionally, the switchable diffuser comprises: polymer dispersed liquid crystals or multistable liquid crystals.
The utility model provides a changeable peep-proof display device and backlight through the optics and the changeable diffusion piece that have the collimation or focus the effect to the center, realizes the switching between narrow visual angle demonstration (peep-proof demonstration) and the non-narrow visual angle picture (normal demonstration). Specifically, the backlight realizes collimation orientation through an optical element with collimation or focusing effect towards the center, and is a narrow viewing angle, when the switching diffusion sheet is in a transparent state, the direction of the backlight is still limited when the backlight is emitted from the transparent state switching diffusion sheet, and narrow viewing angle display can be realized; when the switchable diffusion sheet is switched to a scattering state, after narrow-view-angle incident light passes through the scattering state switchable diffusion sheet, directional light is uniformly scattered, and emergent light is changed into uniform non-directional light, so that a display picture is changed into a non-narrow-view-angle picture, namely, peep-proof normal display is not provided, real-time requirements of people in different occasions are met, and when information sharing is needed, a wide-view-angle mode can be adopted; when personal use or close use is required, a narrow viewing angle mode may be employed. Compared with the prior art, the optical element with the collimation or focus-on-center effect has lower cost than the 3M peep-proof film, and the mass production of products is easy to realize.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a display device capable of switching between peep-proof and normal display according to the prior art;
fig. 2 is a schematic view of a switchable privacy display device according to a first embodiment of the present invention, illustrating a narrow viewing angle display principle;
fig. 3 is a schematic view of a wide viewing angle display principle of a switchable privacy display device according to a first embodiment of the present invention;
fig. 4 is a schematic view of a narrow viewing angle display of another switchable privacy display device according to an embodiment of the present invention;
fig. 5 is a schematic view of a wide viewing angle display of another switchable privacy display device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a first backlight source according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second backlight provided in the second embodiment of the present invention.
Reference numerals
11-backlight unit, 12-light directing film, 13-switchable diffuser, 3-display panel,
14-backlight source, 15-Fresnel lens, 141-light source, 142-point light source.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Example one
The embodiment of the utility model provides a changeable peep-proof display device, it is shown with reference to fig. 2-4, this display device includes: a backlight source 14, an optical member (such as a fresnel lens 15 in the figure) with a collimating or focusing effect, a switchable diffuser 13 and a display panel 3; the backlight 14 is used to provide backlight for the display panel 3; the switchable diffusion sheet 13 can be switched between a transparent state and a scattering state, and when the switchable diffusion sheet 13 is in the transparent state, the propagation direction of the backlight is not changed; in the scattering state, the switchable diffuser 13 scatters the backlight to obtain a wide viewing angle exiting backlight.
In this embodiment, the backlight source 14, the optical member with the collimating or focusing effect, the switchable diffuser 13, and the display panel 3 are sequentially disposed, the backlight source 14 provides backlight, the optical member with the collimating or focusing effect at least covers a display area of the display panel for realizing the collimating and directing of the backlight, and the switchable diffuser 13 realizes switching between narrow viewing angle display (anti-peep display) and non-narrow viewing angle display (normal display). Specifically, the collimated and oriented backlight is emitted to the switching diffusion sheet 13, when the switching diffusion sheet 13 is in a transparent state, the switching diffusion sheet 13 is equivalent to a parallel glass brick, the emergent light is parallel to the incident light, namely, the backlight is still limited during emission, and the display panel 3 is in a narrow viewing angle display mode and is peep-proof; when the switchable diffusion sheet is switched to a scattering state, the collimated and directional backlight is uniformly scattered at the position of the switching diffusion sheet 13, emergent light is changed into uniform non-directional light, a picture can be observed in a wide visual angle area, the display panel 3 is changed into a wide visual angle display mode, normal display with a peep-proof function is avoided, and real-time requirements of people in different occasions can be met. Compared with the prior art, the optical element with the collimation or focus-on-center effect has lower cost than the 3M peep-proof film, and the mass production of products is easy to realize.
The display panel 3 is a liquid crystal display screen or other non-active light-emitting display screens; the switching diffuser 13 may be a scattering film made of polymer dispersed liquid crystal or multistable liquid crystal, or other devices that can switch between a transparent state and a scattering state, or any implementation that can switch between a transparent state and a scattering state as is well known to those skilled in the art.
The optics have a collimating or focusing effect towards the center, preferably a fresnel lens (fresnel lens). The Fresnel lens, also known as a screw lens, is mostly a sheet formed by injection molding of polyolefin material and is also made of glass, one surface of the lens is a smooth surface, the other surface is inscribed with concentric circles from small to large, and the texture of the Fresnel lens is designed according to the requirements of light interference and interference, relative sensitivity and receiving angle.
As shown in fig. 2 and fig. 3, in an embodiment, a smooth surface of the fresnel lens 15 is opposite to a light-emitting surface of the backlight 14, and the backlight 14 includes a light source 141, a light guide plate, and a diffusion sheet (not shown in detail), and may further include other optical films. The display panel 3 may be slightly smaller than the area of the fresnel lens 15. The backlight is collimated and oriented by the fresnel lens 15, when the switching diffuser 13 is in a transparent state, the propagation direction of the backlight is almost unchanged when the backlight passes through the switching diffuser 13 in the transparent state, and the display panel 3 is in a narrow viewing angle display mode, as shown in fig. 2 specifically; when the switchable diffusion sheet 13 is switched to a scattering state, the collimated and directional backlight is uniformly scattered at the position of the switchable diffusion sheet 13, emergent light is changed into uniform non-directional light, pictures can be observed in a wide visual angle area, the display panel 3 is changed into a wide visual angle display mode, and real-time requirements of people in different occasions are met. The switchable privacy display device of the embodiment can directly utilize the existing backlight source and display panel, and the display device can be switched between the privacy display narrow viewing angle mode and the normal display wide viewing angle mode only by adding the fresnel lens 15 and the switchable diffusion sheet 13 between the backlight source and the display panel. Moreover, compared with the prior art, the optical member with the collimation or focus-on-center effect has lower cost than the 3M peep-proof film, and the mass production of products is easy to realize.
As shown in fig. 4 and fig. 5, in another embodiment, a surface of the fresnel lens 15 inscribed with a concentric circle is opposite to a light emitting surface of the backlight 14 (i.e. the fresnel lens 15 is inverted), and the backlight 14 includes the light source 141 and the reflective sheet, and does not include the light guide plate and the diffusion sheet. The display device can realize the switching between the wide visual angles of the peep-proof display and the normal display, and simultaneously saves components and reduces the cost.
In this embodiment, the face of the fresnel lens 15 with the concentric circles is placed facing to the backlight, the backlight source 14 can be realized by the point light source 142, the converged light emitted by the point light source 142 becomes collimated parallel light after passing through the fresnel lens 15, when the switchable diffuser 13 is in a transparent state, the emergent light is still collimated parallel light, and the display panel 3 is in a narrow viewing angle state, as shown in fig. 4: when the switchable diffuser 13 is in a scattering state, the collimated parallel light is uniformly scattered by the switchable diffuser 13, and the emergent light becomes uniform non-directional light, so that the display panel 3 is in a wide viewing angle state, as shown in fig. 5. In this embodiment, the original light guide plate and diffuser can be removed from the backlight 14, and the reflector needs to be kept and placed below the point light sources.
The utility model provides a changeable peep-proof display device can realize the switching of narrow visual angle and wide visual angle to it is with low costs.
Example two
The embodiment of the present invention further provides a backlight source suitable for the switchable privacy display device, as shown in fig. 6 and 7, the backlight source includes a backlight component 11, an optical component (such as a fresnel lens 15 in the figure) having a collimating or focusing effect toward the center, and a switchable diffuser 13, which are sequentially disposed; the backlight unit is a unit constituting a backlight source such as a light source, a light guide plate, an optical film, and the like, and the backlight unit 11 herein should at least include a light source capable of providing a backlight; the switchable diffuser 13 can be switched between a transparent state and a scattering state, and when in the transparent state, the switchable diffuser does not change the propagation direction of the backlight; when the backlight is in the scattering state, the switchable diffusion sheet 13 scatters the backlight to obtain a wide viewing angle backlight, and switching between a narrow viewing angle and a wide viewing angle can be realized.
Preferably, the optical element with collimation or focus towards the center is a fresnel lens.
As shown in fig. 6, the smooth surface of the fresnel lens 15 may be opposite to the light-emitting surface of the backlight unit 11, where the backlight unit 11 includes a light source 141, a light guide plate and a diffusion sheet; alternatively, as shown in fig. 7, the surface of the fresnel lens 15 on which the concentric circles are inscribed is opposite to the light-emitting surface of the backlight component 11, and the backlight component includes the point light source 142 and the reflective sheet, but does not include the light guide plate and the diffusion sheet.
The backlight source of the embodiment is matched with the display panel, can realize the switching between the narrow visual angle and the wide visual angle, is low in cost and is easy to realize mass production.
The embodiment of the utility model provides a still provide a display device, it includes display panel and above-mentioned arbitrary backlight. The display device can be switched between peep-proof display and normal display, and is low in cost. The display device may be: the display device comprises any product or component with a display function, such as a liquid crystal panel, electronic paper, a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A switchable privacy display device, comprising: the backlight source, the optical piece with collimation or focus effect to the center, the switchable diffusion sheet and the display panel are arranged in sequence;
the backlight source is used for providing backlight for the display panel;
the switchable diffusion sheet can be switched between a transparent state and a scattering state, and the transmission direction of the backlight is not changed by the switchable diffusion sheet when the switchable diffusion sheet is in the transparent state; and when the backlight module is in a scattering state, the switchable diffusion sheet scatters the backlight to obtain the wide-viewing-angle backlight.
2. The switchable privacy display device of claim 1, wherein the optic having collimating or focusing toward the center is a fresnel lens.
3. The switchable privacy display of claim 2, wherein the smooth surface of the fresnel lens is opposite to the light exit surface of the backlight, the backlight comprising a light source, a light guide plate, and a diffuser; or,
one surface of the Fresnel lens, on which the concentric circles are inscribed, is opposite to the light emergent surface of the backlight source, and the backlight source comprises a light source and a reflecting sheet, but does not comprise a light guide plate and a diffusion sheet.
4. A switchable privacy display device as claimed in claim 1,
the switchable diffuser includes: polymer dispersed liquid crystals or multistable liquid crystals.
5. A switchable privacy display device as claimed in claim 1,
the optical member having a collimating or focusing effect covers at least a display area of the display panel.
6. A backlight source is suitable for a switchable peep-proof display device and is characterized by comprising a backlight component, an optical piece with collimation or focus-to-center effect and a switchable diffusion sheet which are arranged in sequence;
the backlight assembly includes at least a light source for providing a backlight;
the switchable diffusion sheet can be switched between a transparent state and a scattering state, and the transmission direction of the backlight is not changed by the switchable diffusion sheet when the switchable diffusion sheet is in the transparent state; and when the backlight module is in a scattering state, the switchable diffusion sheet scatters the backlight to obtain the wide-viewing-angle backlight.
7. The backlight of claim 6, wherein the collimating or center focusing optic is a Fresnel lens.
8. The backlight of claim 7, wherein a smooth surface of the Fresnel lens is opposite to a light exit surface of the backlight assembly, the backlight assembly comprising a light source, a light guide plate, and a diffuser; or,
one surface of the Fresnel lens, on which the concentric circles are inscribed, is opposite to the light-emitting surface of the backlight component, and the backlight component comprises a light source and a reflecting sheet and does not comprise a light guide plate and a diffusion sheet.
9. The backlight of claim 6,
the switchable diffuser includes: polymer dispersed liquid crystals or multistable liquid crystals.
10. A switchable privacy display device comprising a display panel and the backlight of any one of claims 6-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620157686.XU CN205405002U (en) | 2016-03-01 | 2016-03-01 | Changeable peep -proof display device and backlight |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620157686.XU CN205405002U (en) | 2016-03-01 | 2016-03-01 | Changeable peep -proof display device and backlight |
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| CN205405002U true CN205405002U (en) | 2016-07-27 |
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| CN201620157686.XU Active CN205405002U (en) | 2016-03-01 | 2016-03-01 | Changeable peep -proof display device and backlight |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549238A (en) * | 2016-03-01 | 2016-05-04 | 京东方科技集团股份有限公司 | Switchable peep-proof display device and backlight |
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2016
- 2016-03-01 CN CN201620157686.XU patent/CN205405002U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549238A (en) * | 2016-03-01 | 2016-05-04 | 京东方科技集团股份有限公司 | Switchable peep-proof display device and backlight |
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