CN108445580A - A kind of Quantum Dot Glass light guide plate assembly and its manufacturing method, backlight module, display - Google Patents
A kind of Quantum Dot Glass light guide plate assembly and its manufacturing method, backlight module, display Download PDFInfo
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- CN108445580A CN108445580A CN201810529224.XA CN201810529224A CN108445580A CN 108445580 A CN108445580 A CN 108445580A CN 201810529224 A CN201810529224 A CN 201810529224A CN 108445580 A CN108445580 A CN 108445580A
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- glass
- quantum dot
- guide plate
- light guide
- plate assembly
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- 239000002096 quantum dot Substances 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000011521 glass Substances 0.000 claims abstract description 68
- 239000005357 flat glass Substances 0.000 claims abstract description 24
- 238000013461 design Methods 0.000 claims abstract description 12
- 238000007738 vacuum evaporation Methods 0.000 claims abstract description 12
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 238000009792 diffusion process Methods 0.000 claims description 10
- 238000000889 atomisation Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000007800 oxidant agent Substances 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 claims description 4
- 238000007740 vapor deposition Methods 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 8
- 239000010408 film Substances 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000003085 diluting agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000003064 anti-oxidating effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007761 roller coating Methods 0.000 description 2
- 235000019795 sodium metasilicate Nutrition 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241001062009 Indigofera Species 0.000 description 1
- 241001025261 Neoraja caerulea Species 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Planar Illumination Modules (AREA)
Abstract
The present invention proposes a kind of Quantum Dot Glass light guide plate assembly, including upper and lower two sheet glass, and upper and lower two sheet glass is fitted tightly over together；Quantum dot is set by the way of vacuum evaporation to be coated uniformly on the lower surface of upper glass between two sheet glass, lower glass has optical light guiding plate characteristic, has the function that linear light source is converted to area source, and upper glass has the function of protection quantum dot.The Quantum Dot Glass leaded light component of the present invention, it can be widely applied in the sidelight type backlight module of blue LED lamp, instead of the quantum film of traditional PET compositions, the property of light guide plate is remained simultaneously, it can carry out optics net-pont design, the uniformity for optimizing picture makes TV modules to ultrathin, the development of superelevation colour gamut.
Description
Technical field
The present invention relates to TV back light model setting technologies field, more particularly to a kind of Quantum Dot Glass light guide plate assembly and its manufacture
Method, backlight module, display.
Background technology
Traditionally, LCD TV uses acrylic light guide plate, thickness to be generally 3-5mm, this so that designer is difficult
Television set thickness is reduced again.Newest structure is to use glass light guide plate in the prior art, with ultra-violet curing pressure sensitive adhesive glass
Light guide plate and reflector plate bond together, and just constitute light guide plate assembly.The optical property and mechanical performance of this component, are integrally wanted
Better than traditional acrylic light guide plate assembly.Due to the high-mechanical property of glass itself, the use of aluminium backboard can be cancelled, make liquid
Brilliant TV becomes thinner, most thin to be less than 5mm, reduces the thickness of television set 70% and 30% weight.
On available liquid crystal display, with it is in bright gay color degree require it is higher and higher, generally can use quantum film framework
Mode come improve chromaticity and improve efficiency.Current quantum film is upper and lower two PET films, the quantum dot that centre uniformly coats
It presses.
As shown in Figure 1, existing quantum dot module includes reflector plate 3, the light guide plate (LGP) 5 with optics site 4, by two
Quantum film 9, lower diffusion sheet 8 and other optical film materials made of PET film 6 and quantum dot 7 are opened, and each component is individually placed.
The shortcomings that existing quantum dot module, mainly has following：1, discrete item is more, as traditional final assembly, needs
A large amount of manpower；2, due to the presence of conventional aluminum backboard, module thickness can not reach the design of slimming；3, traditional quantum film is deposited
In edge fail area, edge indigo plant side phenomenon is presented on picture, additional cost need to be increased by eliminating this phenomenon.
Invention content
To solve above-mentioned deficiency of the prior art, the present invention provides a kind of novel Quantum Dot Glass leaded light board groups
Part achievees the effect that show color gamut value saturation to substitute quantum film.The present invention also provides a kind of novel Quantum Dot Glass
Light guide plate assembly manufacturing method, backlight assembly, display.
The technical proposal of the invention is realized in this way：
A kind of Quantum Dot Glass light guide plate assembly, including upper and lower two sheet glass, upper and lower two sheet glass are fitted tightly over together；
Quantum dot is set to be coated uniformly on the lower surface of upper glass by the way of vacuum evaporation between two sheet glass, lower glass is with optics
Light guide plate characteristic, has the function that linear light source is converted to area source, and upper glass has the function of protecting quantum dot.
Optionally, quantum dot is made to be coated uniformly on the lower surface of upper glass between two sheet glass by the way of vacuum evaporation
On, transient heating temperature is less than or equal to 200 degrees Celsius, and temperature constant state is less than or equal to 120 degrees Celsius.
The ratio of tri- color quantum dots of RGB is 0.8-1.2:1.8-2.2:2.8-3.5 vacuum degree 1*10-1-1*10-6Pa steams
Temperature is plated between 55 DEG C to 120 DEG C.
Optionally, optics net-pont design being carried out in the lower surface of lower glass, the local density close to LED is smaller, further away from
The local density of LED is bigger, and prints ink with this.
Optionally, the upper surface of the upper glass is coated with diffusion oxidant layer, has the function of light diffusion atomization.
Optionally, lower thickness of glass 0.5mm-2mm, upper thickness of glass 0.3mm-1mm.
The invention also provides a kind of Quantum Dot Glass light guide plate assembly manufacturing methods, including upper and lower two sheet glass, use
The mode of vacuum evaporation makes quantum dot be coated uniformly on the lower surface of glass；Optics site is carried out in the lower surface of lower glass
Design, makes it have optical light guiding plate characteristic, has the function that linear light source is converted to area source；Upper and lower two sheet glass is close
It fits together.
Optionally, diffusant is coated in the upper surface of upper glass, it is made to have the function of light diffusion atomization.
The invention also provides a kind of backlight modules, including the Quantum Dot Glass light guide plate assembly described in above-described embodiment.
The invention also provides a kind of displays, including the backlight module described in above-described embodiment.
The beneficial effects of the invention are as follows：
(1) complex effect increases the optical effect of monomer, reduces the use of discrete item；
(2) use glass as carrier, the alternative traditional aluminium backboard of intensity reduces the thickness of module.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram of existing quantum dot module；
Fig. 2 is the structural schematic diagram of the quantum dot light guide plate assembly of the present invention；
Fig. 3 is the structural schematic diagram of the backlight module of the present invention；
Fig. 4 is the flow chart of the quantum dot light guide plate assembly manufacturing method of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention proposes a kind of Quantum Dot Glass light guide plate assembly, including upper and lower two sheet glass, and upper and lower two sheet glass is tight
It is closely connected to be combined；Quantum dot is set by the way of vacuum evaporation to be coated uniformly on the lower surface of upper glass between two sheet glass,
Lower glass has optical light guiding plate characteristic, has the function that linear light source is converted to area source, and upper glass has protection quantum dot
Function.
Fig. 2 shows a specific embodiments of Quantum Dot Glass light guide plate assembly of the present invention, including upper and lower two sheet glass；
20 thickness 0.5mm-2mm of lower glass, lower surface design optics site 21 converts linear light source to area source, therefore lower glass has
There is optical light guiding plate characteristic.10 thickness 0.3mm-1mm of upper glass, lower surface are coated with quantum dot layer 30, and upper glass 10 is main
Play the role of protecting quantum dot layer.Can correspondingly certain surface treatment be carried out to the upper surface of upper glass, it is made to have expansion
Light is spread and is atomized, optimized optical frame, make for example, in the upper surface of upper glass coating diffusion oxidant layer by the effect of astigmatism line
It is evenly soft, such as select diffusant main component be acrylic resin, glass is coated uniformly on by the way of roller coating
On glass surface.Upper and lower two sheet glass is fitted tightly over together, and bonding position edge is bonded by glass cement 40, isolation air and
Water, if the area covering bonding position edge of glass cement, such as glued by glass cement within the scope of edge 3-4mm
It closes, the main component of glass cement is sodium metasilicate and organic silicone.
The lower surface of upper glass coats the process of quantum dot layer by the way of vacuum evaporation, and transient heating temperature is less than etc.
In 200 DEG C, temperature constant state is less than or equal to 120 DEG C.The ratio of tri- color quantum dots of RGB is 0.8-1.2:1.8-2.2:2.8-3.5, with
Diluent is reconciled.According to a preferred embodiment of the present invention, during vacuum evaporation, vacuum degree 1*10-1-1*
10-6Pa, vapor deposition temperature is between 55 DEG C to 120 DEG C.Ether solvent or epoxide resin reactive solvent generally can be used in diluent.
According to a preferred embodiment of the present invention, optics net-pont design is carried out in the lower surface of lower glass, close to LED's
Local density is smaller, and the local density further away from LED is bigger, and edge dot density is slightly larger than intermediate dot density, and is printed with this
Brush ink.
Glass after fitting has high mechanical properties, stress value, high durability and anti-scratch property, can replace quantum film,
Applied in blue-ray LED sidelight type backlight module.Fig. 3 shows that the Quantum Dot Glass light guide plate assembly by the present invention is applied and is carrying on the back
A specific embodiment in optical assembly, the backlight module 100 include：Liquid-crystalline glasses 70, diffusion sheet 80, brightening piece 90, quantum
Point glass light guide plate component 1, reflector plate 50, auxiliary stand 65 and blue led 60, glass under Quantum Dot Glass light guide plate assembly
The lower surface design of glass has site 21.
The Quantum Dot Glass light guide plate assembly of the present invention is widely used in the sidelight type backlight module of blue LED lamp, replaces
Cancel aluminium backboard instead of quantum film for traditional PMMA or MS material light guide plates, makes TV modules to ultrathin, superelevation Qinghua hair
Exhibition.
The invention also provides a kind of Quantum Dot Glass light guide plate assembly manufacturing method, the amount of making by the way of vacuum evaporation
Son point is coated uniformly on the lower surface of glass；Optics net-pont design is carried out in the lower surface of lower glass, makes it have optics
Light guide plate characteristic has the function that linear light source is converted to area source；Upper and lower two sheet glass is fitted tightly over together.
The lower surface of upper glass coats the process of quantum dot layer by the way of vacuum evaporation, and transient heating temperature is less than etc.
In 200 DEG C, temperature constant state is less than or equal to 120 DEG C.The ratio of tri- color quantum dots of RGB is 0.8-1.2:1.8-2.2:2.8-3.5, with
Diluent is reconciled.According to a preferred embodiment of the present invention, during vacuum evaporation, vacuum degree 1*10-1-1*
10-6Pa, vapor deposition temperature is between 55 DEG C to 120 DEG C.Ether solvent or epoxide resin reactive solvent generally can be used in diluent.
To lower glass surface treatment, optics net-pont design is carried out in the lower surface of lower glass, close to LED local density compared with
Small, the local density further away from LED is bigger, and prints ink with this.
Certain surface treatment is carried out to the upper surface of upper glass, it is made to have the effect of diffusing light, for example, in upper glass
The upper surface coating diffusion oxidant layer of glass, light is spread and is atomized, optimizes optical frame, is allowed to evenly soft, such as selects and expands
The main component of powder is acrylic resin, is coated uniformly on glass surface by the way of roller coating.
Upper and lower two sheet glass is fitted tightly over together, and bonding position edge is bonded by glass cement 40, isolation air and
Water, if the area covering bonding position edge of glass cement, such as glued by glass cement within the scope of edge 3-4mm
It closes, the main component of glass cement is sodium metasilicate and organic silicone.
Fig. 4 shows a specific embodiment of manufacturing method of the present invention, in the embodiment, first uses the side of vacuum evaporation
Formula makes quantum dot be coated uniformly on the lower surface of glass, upper and lower two sheet glass is then carried out anti-oxidation pressing, then carry out
The processing of glass surface.It is of course also possible to first carry out the processing of glass surface, then carry out the anti-oxidation pressing of two sheet glass.
The Quantum Dot Glass leaded light component of the present invention, can be widely applied in the sidelight type backlight module of blue LED lamp, replaces
For the quantum film of traditional PET compositions, while the property of light guide plate is remained, optics net-pont design can be carried out, optimize picture
Uniformity, make TV modules to ultrathin, the development of superelevation colour gamut.
The invention also provides a kind of backlight modules, including Quantum Dot Glass leaded light component described above.
The invention also provides a kind of displays, including backlight module described above.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (10)
1. a kind of Quantum Dot Glass light guide plate assembly, which is characterized in that including upper and lower two sheet glass, upper and lower two sheet glass closely pastes
It is combined；Quantum dot is set by the way of vacuum evaporation to be coated uniformly on the lower surface of upper glass, lower glass between two sheet glass
Glass has optical light guiding plate characteristic, has the function that linear light source is converted to area source, and upper glass has the work(of protection quantum dot
Energy.
2. a kind of Quantum Dot Glass light guide plate assembly as described in claim 1, which is characterized in that using true between two sheet glass
The mode of sky vapor deposition makes quantum dot be coated uniformly on the lower surface of glass, and transient heating temperature is less than or equal to 200 degrees Celsius,
Temperature constant state is less than or equal to 120 degrees Celsius.
3. a kind of Quantum Dot Glass light guide plate assembly as claimed in claim 2, which is characterized in that the ratio of tri- color quantum dots of RGB
Example is 0.8-1.2:1.8-2.2:2.8-3.5 vacuum degree 1*10-1-1*10-6Pa, vapor deposition temperature is between 55 DEG C to 120 DEG C.
4. a kind of Quantum Dot Glass light guide plate assembly as described in claim 1, which is characterized in that the lower surface of lower glass into
Row optics net-pont design, the local density close to LED is smaller, and the local density further away from LED is bigger, and prints ink with this.
5. a kind of Quantum Dot Glass light guide plate assembly as described in claim 1, which is characterized in that the upper surface of the upper glass
Coated with diffusion oxidant layer, have the function of light diffusion atomization.
6. a kind of Quantum Dot Glass light guide plate assembly as described in claim 1, which is characterized in that lower thickness of glass 0.5mm-
2mm, upper thickness of glass 0.3mm-1mm.
7. a kind of Quantum Dot Glass light guide plate assembly manufacturing method, including upper and lower two sheet glass, which is characterized in that steamed using vacuum
The mode of plating makes quantum dot be coated uniformly on the lower surface of glass；Optics net-pont design is carried out in the lower surface of lower glass,
Optical light guiding plate characteristic is made it have, has the function that linear light source is converted to area source；Upper and lower two sheet glass is fitted closely
Together.
8. a kind of Quantum Dot Glass light guide plate assembly manufacturing method as claimed in claim 7, which is characterized in that in upper glass
Upper surface coats diffusant, it is made to have the function of light diffusion atomization.
9. a kind of backlight module, which is characterized in that including claim 1 to 6 any one of them Quantum Dot Glass leaded light board group
Part.
10. a kind of display, which is characterized in that including the backlight module described in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810529224.XA CN108445580A (en) | 2018-05-29 | 2018-05-29 | A kind of Quantum Dot Glass light guide plate assembly and its manufacturing method, backlight module, display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810529224.XA CN108445580A (en) | 2018-05-29 | 2018-05-29 | A kind of Quantum Dot Glass light guide plate assembly and its manufacturing method, backlight module, display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108445580A true CN108445580A (en) | 2018-08-24 |
Family
ID=63204951
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|---|---|---|---|
| CN201810529224.XA Pending CN108445580A (en) | 2018-05-29 | 2018-05-29 | A kind of Quantum Dot Glass light guide plate assembly and its manufacturing method, backlight module, display |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261952A (en) * | 2019-08-02 | 2019-09-20 | 广州希恩朋克光电产品股份有限公司 | A kind of light guide plate and preparation method thereof |
| CN112180497A (en) * | 2020-10-28 | 2021-01-05 | 东莞市银泰丰光学科技有限公司 | Glass light guide plate and glass diffusion plate fuse structure in a poor light |
| CN114333561A (en) * | 2022-01-30 | 2022-04-12 | 深圳市瀚达美电子有限公司 | Quantum dot LED lamp strip suitable for high-color-gamut backlight module and backlight module |
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| CN208334699U (en) * | 2018-05-29 | 2019-01-04 | 青岛骐骥光电科技有限公司 | A kind of Quantum Dot Glass light guide plate assembly and backlight module, display |
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| CN103968306A (en) * | 2014-05-27 | 2014-08-06 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
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| CN110261952A (en) * | 2019-08-02 | 2019-09-20 | 广州希恩朋克光电产品股份有限公司 | A kind of light guide plate and preparation method thereof |
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| CN114333561A (en) * | 2022-01-30 | 2022-04-12 | 深圳市瀚达美电子有限公司 | Quantum dot LED lamp strip suitable for high-color-gamut backlight module and backlight module |
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Effective date of registration: 20200226 Address after: No.36, Yuyuan Third Road, Jihongtan street, Chengyang District, Qingdao, Shandong Province Applicant after: Qingdao Guoqi Photoelectric Technology Co., Ltd Address before: 266000 Shandong Province, Qingdao city Chengyang District Qing Xia Road No. 51 Applicant before: Qingdao Qiji Photoelectric Technology Co.,Ltd. |