CN208833940U - Backlight, peep-proof display device and the device shown for realizing naked eye three-dimensional image - Google Patents

Abstract

The utility model relates to display technologies, in particular to backlight, the peep-proof display device comprising the backlight and the device shown for realizing naked eye three-dimensional image comprising the backlight.Backlight according to the utility model one aspect includes: light guide plate, it includes the first micro-structures for being located at light guide plate upper surface, lower surface or inside, first micro-structure has the first unit of periodic distribution, and the light beam that the light source issues is through first microstructures scatters to the outside of light guide plate；And optical film, it is set on the direction of propagation through the light beam outside the first microstructures scatters to light guide plate and the second micro-structure comprising being located at optics film surface, second micro-structure has the second unit of periodic distribution, and the light beam of the outside through first microstructures scatters to light guide plate is collimated light beam or convergent beam through the second microstructure manipulation.

Description

It backlight, peep-proof display device and shows for realizing naked eye three-dimensional image Device

Technical field

The present invention relates to display technologies, in particular to backlight, the peep-proof display device comprising the backlight and packet The device shown for realizing naked eye three-dimensional image containing the backlight.

Background technique

Backlight is the light supply apparatus for illuminating passive luminous display unit (such as liquid crystal display).Backlight has light The advantages that utilization efficiency is high, the uniformity is high and power consumption is small.In some application fields, for the purpose of privacy protection, it is desirable to will The visual angle of display device is limited in a narrow range, thus directive property backlight technology comes into being.Directive property backlight skill Art can be realized the illumination of single or several special angles, i.e., brightness is with angle significant change.

Entitled " directive property backing structure and method of the LED based without auxiliary stereoscopic display " Chinese patent application is (public The number of opening CN104597608A) a kind of directive property backing structure is disclosed, the directive property optical module includes cylindrical lens, light guide plate It including thin light guide plate and thick light guiding plate and is that parallel light guide plate, the refractive power reflecting prism of thin light guide plate end installation and imaging are saturating Mirror；The diverging light that LED light source unit issues is compressed into directional light in a plane and is transmitted by light guide plate by cylindrical lens, and Keep transmission characteristic constant；The effect of light guide plate is to make light that total reflection be kept to transmit wherein and increase light path, saturating with imaging Mirror imaging；And the light beam that this is then compressed into directional light by imaging len in a plane carries out compression biography in orthogonal direction It is defeated, form second, third convergence watch window.By above three component, the convergence emergent pupil with directional property is formed, and is protected Witness's eye can see entire screen at exit pupil position.In above-mentioned directive property backing structure and method, in order to realize directive property Back lighting is needed using greater number of module, and which increase the complexity of design, are also unfavorable for the collection with other devices At.

Chinese patent application (the publication number of entitled " double vision film and the Dual-view display equipment using double vision film " CN105745925 a kind of double vision film and the double vision display technology using double vision film, the double vision using double vision film) are disclosed Show that equipment includes: light guide plate, the light guide plate is configured to the path of guidance output light；Left light source and right light source, the left side Light source and the right light source are configured to adjacent with the light guide of two edges of the light guide to guide the output light Path and according to continuous left timing and right the timing output light in left direction or right direction；Reflecting surface, the reflection table Face is configured on the bottom positioned at the light guide to reflect back the light from the light guide and by the output Light reflects back；Double vision film, the double vision film include prism input layer and lens output layer, more in the prism input layer A prism is that continuously, in the lens output layer, multiple lens are described double on the entire lower surface of the double vision film Depending on being that continuously, the double vision film is configured to come from two positioned at the top of the light guide to be oriented on the entire upper surface of film The light of light source simultaneously reflects the light inputted in the left side or right side of the prism input layer from the light guide plate, and By the reflection anaclasis at the left direction by the lens output layer towards the normal direction axis for deviateing the double-vision display Or the observer in right direction；And display panel, the display panel are configured to top and benefit positioned at the double vision film With the refraction light, the observer in the left direction or the right direction shows different images.It is shown in above-mentioned double vision In equipment, in order to realize single direction or both direction special angle illumination, need the prism vertex angle using different angle, This causes design to complicate；In addition, double vision film should realize directional lighting, guarantee light guide plate light-emitting uniformity again, therefore make It is larger to make difficulty；Furthermore multiple optical properties are restricted by common structural parameters, further increase the complexity of design.

Summary of the invention

It is low with manufacturing cost, design is easy and compact-sized it is an object of the present invention to provide a kind of backlight The advantages that.

Include according to the backlight of one aspect of the invention:

Light guide plate, it includes the first micro-structure for being located at light guide plate upper surface, lower surface or inside, first micro-structure tools There is the first unit of periodic distribution, the light beam that the light source issues is through first microstructures scatters to the outside of light guide plate； And

Optical film is set on the direction of propagation through the light beam outside the first microstructures scatters to light guide plate and includes Positioned at the second micro-structure of optics film surface, which has the second unit of periodic distribution, micro- through described first Structural scattering to the outside of light guide plate light beam through the second microstructure manipulation be collimated light beam or convergent beam.

Preferably, in above-mentioned backlight, the light guide plate is stacked with optical film stack.

Preferably, in above-mentioned backlight, the light guide plate and optical film are separated by with the air gap.

Preferably, in above-mentioned backlight, low-index layer is set between the light guide plate and optical film.

Preferably, in above-mentioned backlight, the first unit is microprism, lenticule, free-form surface lens or pit One of.

Preferably, in above-mentioned backlight, the second unit is one in lenticule, Fresnel lens or thin film lens Kind.

Preferably, in above-mentioned backlight, the backlight further comprises between the light guide plate and optical film Barn door, it includes light-shielding structures corresponding with first micro-structure and the matching of the second micro-structure to filter out from described second The stray light of micro-structure outgoing.

Preferably, in above-mentioned backlight, the backlight further comprises the barn door inside the light guide plate, It includes light-shielding structures corresponding with first micro-structure and the matching of the second micro-structure to filter out from second micro-structure The stray light penetrated.

Preferably, in above-mentioned backlight, the backlight further comprises the barn door inside the optical film, It includes light-shielding structures corresponding with first micro-structure and the matching of the second micro-structure to filter out from second micro-structure The stray light penetrated.

Preferably, in above-mentioned backlight, the backlight further comprises light source, is set to the side of the light guide plate Portion.

Preferably, in above-mentioned backlight, the light source is LED line array light source.

It is also an object of the present invention to provide a kind of peep-proof display device, design letter low with manufacturing cost Just with it is compact-sized the advantages that.

Include according to the peep-proof display device of one aspect of the invention:

Backlight as described above；And

Liquid crystal display panel before the backlight.

It is also an object of the present invention to provide a kind of devices shown for realizing naked eye three-dimensional image, have system Make the advantages that at low cost, design is easy and compact-sized.

Include according to the device shown for realizing naked eye three-dimensional image of one aspect of the invention:

Backlight as described above；

Spatial light modulator is located at from the direction of propagation for the collimated light beam that the backlight projects and is configured to lead to It crosses amplitude modulation system multi-angle of view mixed image information is loaded on the collimated light beam to be formed comprising multi-angle of view combination chart As the collimated light beam of information；And

Phase board on the collimated light beam direction of propagation comprising multi-angle of view mixed image information, be configured to by The image of different perspectives in the carried image of collimated light beam comprising multi-angle of view mixed image information is projected to respectively right The observation position answered.The device shown for realizing naked eye three-dimensional image includes:

Detailed description of the invention

Fig. 1 is the schematic diagram according to the backlight of one embodiment of the invention.

Fig. 2 a-2k is the schematic diagram that can be used for a variety of light guide plates of backlight shown in Fig. 1.

Fig. 3 a-3c is the schematic diagram that can be used for a variety of optical films of backlight shown in Fig. 1.

Fig. 4 is the schematic diagram according to the backlight of another embodiment of the present invention.

Fig. 5 a-5d is the schematic diagram according to the backlight of another embodiment of the present invention.

Fig. 6 a-6c is the schematic diagram according to the backlight of another embodiment of the present invention.

Fig. 7 is the schematic diagram according to the peep-proof display device of another embodiment of the present invention.

Fig. 8 is the schematic diagram according to the device of another embodiment of the present invention shown for realizing naked eye three-dimensional image.

Specific embodiment

Backlight of the invention is described in more detail below in conjunction with attached drawing.

Fig. 1 is the schematic diagram according to the backlight of one embodiment of the invention.

Backlight 10 shown in FIG. 1 includes light guide plate 110 and optical film 120.Optionally but not necessarily, light source 130 can be used as the component units of backlight shown in Fig. 1.Preferably, light source 130 can be LED line array light source.

In the embodiment shown in fig. 1, light guide plate 110 and optical film 120 are respectively provided with the first micro-structure and second micro- knot Structure.First micro-structure may be provided at the upper surface, lower surface or inside of light guide plate, the first unit with periodic distribution, After the light beam that light source 130 issues enters light guide plate, the outside through the first microstructures scatters to light guide plate.Second micro-structure has The second unit of periodic distribution, the light beam of the outside through the first microstructures scatters to light guide plate through the second microstructure manipulation subject to Collimated optical beam or convergent beam.

It should be pointed out that in the present specification, collimated light beam, the directional light, direction beam propagated in one direction Emergent ray of the angle of divergence halfwidth within 20 ° is referred to converging beam.Preferably, the angle of divergence halfwidth of emergent ray Within the scope of 1 ° -10 °.

Fig. 2 a-2k is the schematic diagram that can be used for a variety of light guide plates of backlight shown in Fig. 1.

A-2k referring to fig. 2, the first micro-structure 111a-111k on light guide plate 110 include the first unit equidistantly arranged, It is corresponding with the second micro-structure matching on optical film which will be described.Preferably, the ruler of the first micro-structure 111a-111k It is very little between 100nm-1mm.

Light guide plate 110 will be converted to area array light source from LED line light source with uniform irradiation optical film 120.Light guide plate 110 mentions The area source of confession is seen as the point light emitting source of separation arrangement, and each luminous point is seen as lambert's illuminator.Light guide plate On the first micro-structure set up the total reflection propagation conditions of ducting light no longer, therefore light is from light guide plate 110 Evolution.

In the present embodiment, light guide plate 110 can be made of a kind of material, or by a variety of material structures with different refractivity At.

In the present embodiment, the first micro-structure can be formed in the upper surface (such as shown in Fig. 2 a-2i) of light guide plate 110, Inside (such as shown in Fig. 2 j) or lower surface (such as shown in Fig. 2 k) of light guide plate 110 can also be formed in.

In the present embodiment, first unit can be various forms of optical elements, for example including but be not limited to microprism It is (such as shown in Figure 2 a), pit (such as shown in Fig. 2 b-2c), free-form surface lens (such as shown in Fig. 2 d-2f), micro- Lens (such as shown in Figure 2 g) etc..

Fig. 3 a-3c is the schematic diagram that can be used for a variety of optical films of backlight shown in Fig. 1.

As shown in figs 3 a-3 c, show to be formed with the second micro-structure 120a-120c in optical film 120, second micro- knot Structure matches in structure with the first micro-structure.Specifically, the second micro-nano structure 120a-120c has the second of equidistantly distributed Unit, the regularity of distribution is corresponding with the regularity of distribution of the first unit in light guide plate or matches.In the present embodiment, second is micro- Scattering light from light guide plate 110 can be transformed to the collimated light being emitted along one or more directions by micro-nano structure 120a-120c Beam is transformed to converge to the convergent beam of one or more positions.Preferably, the micro-nano structure be microlens array (such as As shown in Figure 3a), array of Fresnel lenses (such as shown in Figure 3b), thin film lens array (such as shown in Figure 3c), binary Structure light etc..The lens unit of microlens array, array of Fresnel lenses or thin film lens array can according to it is micro- in light guide plate Make optimization design to obtain preferable collimation or convergence effect in the relative position of structure.Such as it can will be every in optical film 120 The diameter design of a unit or lenticule is bigger than the size of the unit of light guide plate 110.

Fig. 4 is the schematic diagram according to the backlight of another embodiment of the present invention.

Backlight 40 shown in Fig. 4 includes light guide plate 410, optical film 420 and optional light source 430.

Referring to fig. 4, in the present embodiment, optical film 430 is by the one-dimensional grating array or two-dimensional grating battle array that selectively pass through Column are constituted.The light along specific direction can be only allowed to be emitted using barn door, to obtain collimated ray.

Fig. 5 a-5d is the schematic diagram according to the backlight of another embodiment of the present invention.

Backlight 50 shown in Fig. 5 a-5d includes light guide plate 510, optical film 520 and optional light source 530.

Referring to Fig. 5 a-5d, in the present embodiment, the first micro-structure of light guide plate 510 is pit array, and optical film 520 The second micro-structure be microlens array.Pit on light guide plate 510 is in periodic arrangement, is emitted from light guide plate bowl configurations Area source be seen as lambert's luminous point of equidistant array arrangement.Bowl configurations set up total reflection propagation conditions no longer, Light is caused to escape from light guide plate.Although the first micro-structure or bowl configurations shown in Fig. 5 a-5d are located at table on light guide plate Face, but it may be alternatively located inside the lower surface or light guide plate of light guide plate.Preferably, the bowl configurations size is in 100nm-1mm Between.When the refractive index of optical film is close to or higher than the refractive index of light guide plate, need to keep certain between light guide plate and optical film The air gap, or between light guide plate and optical film be inserted into one layer of low-index layer.In the present embodiment, light guide plate and optics Relative position between film is set as making the focus of lenticule to be located near light guide plate, to make to dissipate from the bowl configurations of light guide plate The light shot out becomes collimated light beam or convergent beam by micro lens.

In the present embodiment, by adjusting the relative position of light guide plate and optical film can make to have the light of different angle from Optical film projects.Such as when as being set as the relative position of light guide plate and optical film as shown in figure 5a and 5b, it can obtain To the collimated light beam for the outgoing that forms an angle with backlight normal direction, wherein the range at inclination angle is -90 ° to+90 °, especially It is the normal direction (or angle of divergence very little) that can make emergent ray perpendicular to backlight.For another example, when by light guide plate and optical film Relative position be set as shown in Figure 5 c as when, the directive property illumination lights of one or more convergence viewpoints can be obtained.Again When such as, as being set as the relative position of light guide plate and optical film as fig 5d, it can obtain with more than one spy Determine the collimated light beam of angle.

Fig. 6 a-6c is the schematic diagram according to the backlight of another embodiment of the present invention.

The present embodiment and it is aforementioned by Fig. 1, Fig. 2 a-2k, Fig. 3 a-3c, Fig. 4 and Fig. 5 a-5d described embodiment master Want the difference is that, the backlight of the present embodiment also includes barn door.

Referring to Fig. 6 a-6c, backlight 60 includes light guide plate 610, optical film 620, light source 630 and barn door 640a- 640c.In the present embodiment, barn door can be such that light selectively projects from backlight, to filter off spurious rays to obtain The better light of collimation.Can be as shown in Figure 6 a, barn door 640a is set between light guide plate 610 and optical film 620；Or Person can be as shown in Figure 6 b, and barn door 640b is arranged in light guide plate 610；Or it can also as fig. 6 c, in optical film 620 Interior setting barn door.Above-mentioned barn door is corresponding with the first micro-structure of light guide plate and the matching of the second micro-structure of optical film, thus The stray light being emitted from the second micro-structure can be filtered out.Barn door can be single-layer or multi-layer absolute construction, and can be with light guide plate The optical device of function and service is integrated to form with any one or two of optical film.

In each embodiment above by attached drawing description, plastics or glass can be chosen as light guide plate or lenticule Material, refractive index is between 1-2.5.Plastics preferably can be used so that product is lighter and reduce cost.Light guide plate It for example can use the production such as grayscale lithography technique, laser etching process with optical film, and realized and criticized using nano-imprint process Amount duplication.

Fig. 7 is the schematic diagram according to the peep-proof display device of another embodiment of the present invention.

Display device 70 shown in Fig. 7 includes backlight 710 and the liquid crystal display panel 720 before backlight, The collimated light beam that middle backlight 710 projects illuminates liquid crystal display panel.In the present embodiment, it can be used according to described above each The backlight of embodiment is planted to obtain the collimated light beam along specific direction or the outgoing of special angle range, thus by display device Visual angle is limited in a narrow range.

Fig. 8 is the schematic diagram according to the device of another embodiment of the present invention shown for realizing naked eye three-dimensional image.

Device 80 shown in Fig. 8 includes backlight 810, spatial light modulator 820 and phase board 830, wherein backlight 810 The collimated light beam of injection illuminates spatial light modulator 820.In the present embodiment, it can be used according to various embodiments described above Backlight come obtain along specific direction or special angle range outgoing collimated light beam.Spatial light modulator 820 for example can be with It is liquid crystal display panel, is located at from the direction of propagation for the collimated light beam that backlight 810 projects and is configured to pass through amplitude Multi-angle of view mixed image information is loaded on collimated light beam to form the standard for including multi-angle of view mixed image information by modulation system Collimated optical beam.Phase board 830 is located on the direction of propagation of the collimated light beam comprising multi-angle of view mixed image information, is configured to wrap The image of different perspectives in the carried image of collimated light beam of the information of mixed image containing multi-angle of view is projected to corresponding sight Examine position.The micro-nano structure unit of pixel type distribution is formed on phase board 830.By means of on phase board structure gradual change it is micro- Micro-nano structure unit can be modulated light field, to form two or more visual angles in outgoing space, realize two or more Multi-view image separation.

Compared with prior art, backlight of the invention has many advantages, such as.For example, backlight (comprising LED light source, is led Tabula rasa and optical film) using existing nanometer embossing industrialized production, manufacture craft is mature, and homogeneity of product is easy Guarantee and advantageously reduces cost.For another example, each unit of backlight can modularized design, each module is realized relatively only Vertical optical characteristics (such as illumination uniformity, emergent light angle of divergence etc.), this makes each Decoupled, simplifies design process simultaneously And keep the adjustment of optical parameter more easy.Furthermore backlight of the invention is made of multiple film light device stacks, and existing LCD screen framework good compatibility, application field is wide.

Described above is the principle of the present invention and preferred embodiment.However, the present invention should not be construed as limited to be discussed Specific embodiment.Above-mentioned preferred embodiment be considered as it is illustrative and not restrictive, and should understand that When, those skilled in the art, can be under the premise of without departing from the following scope of the claims of the invention as defined Variation is made in these embodiments.

Claims (13)

1. a kind of backlight, characterized by comprising:

Light guide plate, it includes the first micro-structure for being located at light guide plate upper surface, lower surface or inside, which has week The first unit of phase property distribution, the light beam that light source issues is through first microstructures scatters to the outside of light guide plate；And

Optical film is set on the direction of propagation through the light beam outside the first microstructures scatters to light guide plate and includes to be located at Second micro-structure of optics film surface, which has the second unit of periodic distribution, through first micro-structure It is collimated light beam or convergent beam that the light beam of the outside of light guide plate, which is scattered to, through the second microstructure manipulation.

2. backlight as described in claim 1, wherein the light guide plate is stacked with optical film stack.

3. backlight as described in claim 1, wherein the light guide plate and optical film are separated by with the air gap.

4. backlight as described in claim 1, wherein low-index layer is arranged between the light guide plate and optical film.

5. backlight as described in claim 1, wherein the first unit be microprism, lenticule, free-form surface lens or One of pit.

6. backlight as described in claim 1, wherein the second unit is lenticule, Fresnel lens or thin film lens One of.

7. backlight as described in claim 1, wherein the backlight further comprises being located at the light guide plate and optical film Between barn door, it includes light-shielding structures corresponding with first micro-structure and the matching of the second micro-structure to filter out from described The stray light of second micro-structure outgoing.

8. backlight as described in claim 1, wherein the backlight further comprises the screening inside the light guide plate Tabula rasa, it includes light-shielding structures corresponding with first micro-structure and the matching of the second micro-structure to filter out from described second micro- knot The stray light of structure outgoing.

9. backlight as described in claim 1, wherein the backlight further comprises the screening inside the optical film Tabula rasa, it includes light-shielding structures corresponding with first micro-structure and the matching of the second micro-structure to filter out from described second micro- knot The stray light of structure outgoing.

10. backlight as described in claim 1, wherein the light source is included in the backlight, is set to described lead The side of tabula rasa.

11. backlight as claimed in claim 10, wherein the light source is LED line array light source.

12. a kind of peep-proof display device, characterized by comprising:

Backlight as described in any one of claim 1-11；And

Liquid crystal display panel before the backlight.

13. a kind of device shown for realizing naked eye three-dimensional image, characterized by comprising:

Backlight as described in any one of claim 1-11；

Spatial light modulator is located at from the direction of propagation for the collimated light beam that the backlight projects and is configured to pass through vibration Multi-angle of view mixed image information is loaded on the collimated light beam to be formed and be believed comprising multi-angle of view mixed image by width modulation system The collimated light beam of breath；And

Phase board on the collimated light beam direction of propagation comprising multi-angle of view mixed image information, being configured to will be described The image of different perspectives in the carried image of collimated light beam comprising multi-angle of view mixed image information is projected to corresponding Observe position.