CN109061942B - Side-in backlight module and display device - Google Patents
Side-in backlight module and display device Download PDFInfo
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- CN109061942B CN109061942B CN201810928655.3A CN201810928655A CN109061942B CN 109061942 B CN109061942 B CN 109061942B CN 201810928655 A CN201810928655 A CN 201810928655A CN 109061942 B CN109061942 B CN 109061942B
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- 239000003086 colorant Substances 0.000 description 2
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- GBUCDGDROYMOAN-UHFFFAOYSA-N 1,2,5-trichloro-3-phenylbenzene Chemical compound ClC1=CC(Cl)=C(Cl)C(C=2C=CC=CC=2)=C1 GBUCDGDROYMOAN-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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Abstract
The invention provides a side-in type backlight module and a display device, which comprise a light source assembly, a reflecting back plate and a double-sided prism diffusion plate, wherein the double-sided prism diffusion plate is arranged at the front end of a diffuse reflection surface of the reflecting back plate; the light source assembly is arranged between the reflecting back plate and the double-sided prism diffusion plate and is positioned on one side or two sides of the front end of the diffuse reflection surface of the reflecting back plate; the light source assembly comprises a PCB circuit board, a light source arranged on the PCB circuit board and a light condensing unit arranged in the light emitting direction of the light source. According to the invention, the light source assembly, the light reflecting back plate and the double-sided prism diffusion plate are combined, so that the light of a surface light source without a light guide plate is emitted.
Description
Technical Field
The invention relates to a display technology, and in particular relates to a side-in type backlight module and a display device.
Background
Present LCD adopts LED spotlight module more in order to obtain better display color, and traditional LED spotlight module divide into straight following formula LED spotlight module and side income formula LED spotlight module according to the position of light source, and the side income formula spotlight module is owing to adopted this kind of optical element of light guide plate so can make very thin, does benefit to the thin development of LCD display, and the introduction of light guide plate has following problem: firstly, the light efficiency is greatly reduced, and because the LED generates a large amount of heat in the lighting process, the temperature is too high in a narrow cavity of the lateral light-gathering module, so that the warping problem of the light guide plate is caused, and the light efficiency is further reduced; secondly, as the light guide plate material ages, it will produce extinction to specific light emission wavelength, which will further affect the display color. And the production cost is increased due to the complicated optical structure.
Based on the above problem, the application discloses side income formula LED backlight unit of no light guide plate to solve above-mentioned technical problem.
Disclosure of Invention
The embodiment of the invention provides a side-in type backlight module without a light guide plate and a display device; the technical problem that the existing side-entry backlight module and the display device have poor lighting effect due to the light guide plate and further influence on color display is solved.
The embodiment of the invention provides a side-in type backlight module, which comprises:
the light reflecting back plate comprises a diffuse reflection surface and is used for performing diffuse reflection treatment on part of light rays emitted by the light source assembly and radiating the light rays to the double-sided prism diffusion plate;
the double-sided prism diffusion plate is used for scattering light rays reflected by the reflecting back plate and part of light rays emitted by the light source assembly and emitting light, and is arranged at the front end of the diffuse reflection surface of the reflecting back plate; and
the light source assembly is used for providing a light source for the backlight module and emitting light to the reflecting back plate and the double-sided prism diffusion plate, is arranged between the reflecting back plate and the double-sided prism diffusion plate and is positioned on one side of the front end of the diffuse reflection surface of the reflecting back plate, or is positioned on two sides of the front end of the diffuse reflection surface of the reflecting back plate;
the light source assembly comprises a light source and a light condensing unit arranged in the light outlet direction of the light source, the light condensing unit comprises a light condensing assembly used for reducing the light emitting angle of the light source, the light condensing assembly is a combination of a light condensing cup and a light condensing lens, the light condensing cup is covered on the light source, and the light condensing lens is arranged at the light outlet of the light condensing cup.
In a first technical solution of the side-in type backlight module of the present invention, the light source is a white light emitting component.
In a first technical solution of the side-in type backlight module of the present invention, the white light emitting part is an LED lamp, and the light collecting cup is covered on the LED lamp.
In a second technical solution of the side-in type backlight module of the present invention, the light source is a light emitting device emitting red/green/blue light, the light condensing unit includes a light mixing cover covering the light emitting device, and the light condensing cup covers an outer peripheral side of the light mixing cover.
In the second technical scheme of the side-in type backlight module, the light-emitting component is a combination of a red light LED lamp, a green light LED lamp and a blue light LED lamp;
the red light LED lamp, the green light LED lamp and the blue light LED lamp are distributed in a triangular shape.
In the side-in backlight module, the condensing lens comprises a light inlet side and a light outlet side, the light inlet side is provided with a plurality of semi-cylindrical first strip-shaped bodies, the plurality of first strip-shaped bodies are arranged side by side, and the adjacent first strip-shaped bodies are mutually contacted; a plurality of semi-cylindrical second strip-shaped bodies are arranged on the light emergent side, the plurality of second strip-shaped bodies are arranged side by side, and the adjacent second strip-shaped bodies are mutually contacted;
the width of the first strip is greater than the width of the second strip.
In the lateral backlight module, at least part of the second strip bodies are arranged at the junctions between the first strip bodies.
In the lateral backlight module, the diffuse reflection surface of the light reflection back plate is provided with a microstructure for diffuse reflection.
The side-in type backlight module comprises a brightness enhancement film arranged on the light emitting side of the double-sided prism diffusion plate and a frame arranged on the periphery of the light reflecting back plate, wherein the light source assembly is arranged on one side of the frame facing the light reflecting back plate.
The invention also relates to a display device which comprises a display panel and the lateral entrance type backlight module.
Compared with the backlight module in the prior art, the side-in backlight module and the display device provided by the invention have the advantages that the light reflected by the light reflecting back plate and part of the light emitted by the light source assembly are subjected to scattering treatment and form surface light source light emission through the combined arrangement of the light source assembly, the light reflecting back plate and the double-sided prism diffusion plate; the technical problem of current side income formula backlight unit and display device have the light efficiency not good because of the light guide plate, and then influence the display color is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments are briefly described below. The drawings in the following description are only some embodiments of the invention, and it will be clear to a person skilled in the art that other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural diagram of a side-entry backlight module according to a first preferred embodiment of the invention;
FIG. 2 is an enlarged view of A in FIG. 1;
FIG. 3 is a schematic structural diagram of a condensing lens of a first preferred embodiment of a side-entry backlight module according to the invention;
FIG. 4 is a schematic structural diagram of a side-entry backlight module according to a second preferred embodiment of the present invention;
FIG. 5 is an enlarged view of C in FIG. 4;
fig. 6 is a schematic structural view of a light source and a PCB circuit board of a second preferred embodiment of a side-entry backlight module of the invention.
Detailed Description
Refer to the drawings wherein like reference numbers refer to like elements throughout. The following description is based on illustrated embodiments of the invention and should not be taken as limiting the invention with regard to other embodiments that are not detailed herein.
Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a side-entry backlight module according to a first preferred embodiment of the present invention; FIG. 2 is an enlarged view of A in FIG. 1; fig. 3 is a schematic structural diagram of a condensing lens of a first preferred embodiment of a side-entry backlight module according to the invention.
The side-in type backlight module of the first preferred embodiment includes a light reflecting back plate 11, a double-sided prism diffuser plate 12, a light source module, a brightness enhancement film 17, and a frame 18.
Specifically, the reflective back plate 11 includes a diffuse reflection surface for performing diffuse reflection processing on part of the light emitted by the light source assembly and radiating the light to the double-sided prism diffusion plate 12; the double-sided prism diffusion plate 12 is used for scattering light reflected by the light reflection back plate 11 and part of light emitted by the light source assembly and emitting light, and is arranged at the front end of the diffuse reflection surface of the light reflection back plate 11; the light source assembly is used for providing a light source for the backlight module, emitting light to the reflecting back plate 11 and the double-sided prism diffusion plate 12, is arranged between the reflecting back plate 11 and the double-sided prism diffusion plate 12 and is positioned on one side of the front end of the diffuse reflection surface of the reflecting back plate 11, or is positioned on two sides of the front end of the diffuse reflection surface of the reflecting back plate 11. The brightness enhancement film 17 is arranged on the light emitting side of the double-sided prism diffusion plate 12; the frame 18 is disposed around the reflective backsheet 11.
The light source assembly comprises a PCB circuit board 13, a light source 14 arranged on the PCB circuit board 13 and a light condensing unit arranged in the light emitting direction of the light source 14. The PCB circuit board 13 is disposed on a side of the bezel 18 facing the reflective backplane 11.
The light reflecting back plate 11 is used for performing diffuse reflection processing on part of light emitted by the light source assembly, so that uniform light spots can be obtained on the double-sided prism diffusion plate 12, and a diffuse reflection surface of the light reflecting back plate 11 is provided with microstructures for diffuse reflection, such as convex points or concave points of a mesh structure, or V-shaped grooves arranged side by side, and the like. The double-sided prism diffuser plate 12 is used for collecting light rays with large-angle glancing so as to avoid serious Fresnel reflection phenomenon caused by the large-angle glancing.
The side income formula backlight unit of this embodiment passes through the combination setting of light source subassembly, 11 and the two-sided prism diffuser plate 12 of reflection of light backplate, carries out the scattering processing and forms the area source light-emitting with the light that 11 reflects of reflection of light backplate and the partial light that the light source subassembly launches to the realization forms the area source under the condition of no light guide plate.
In the first preferred embodiment, two light source assemblies are provided, and two light source assemblies are provided on two sides of the front end of the diffuse reflection surface of the reflective back plate 11. The arrangement of the two groups of light source components improves the uniformity of light emission of the whole embodiment, and avoids the problems that light on one side is strong and light on the other side is weak. Of course, if the width of the backlight module is smaller, a set of light source modules may be disposed on one side of the front end of the diffuse reflection surface of the reflective backplane.
In the side-in backlight module of the first preferred embodiment, the light source 14 is a light emitting component emitting white light, and the light condensing unit includes a light condensing assembly for reducing the light divergence angle of the light emitting component.
Optionally, the light emitting component 14 is an LED lamp, and the light collecting component is a light collecting lens, a light collecting cup, or a combination of the light collecting cup and the light collecting lens. The LED lamp emits light at 180 degrees.
Preferably, when the light condensing assembly is a combination of the light condensing cup 15 and the light condensing lens 16, the light condensing cup 15 covers the LED lamp, and the light condensing lens 16 is disposed at the light outlet of the light condensing cup 15. The first light condensation of the light-condensing cup 15 is used for reducing the light divergence angle of the LED lamp, and the light condensing lens 16 is used for carrying out second light condensation on the light converged by the light-condensing cup 15 so as to further reduce the light divergence angle and enlarge the grazing area.
Specifically, the condenser lens 16 includes an incident light side and an emergent light side, the incident light side is provided with a plurality of semi-cylindrical first strip-shaped bodies 161, the plurality of first strip-shaped bodies 161 are arranged side by side, and the adjacent first strip-shaped bodies 161 are in contact with each other; the light emitting side is provided with a plurality of semi-cylindrical second strip-shaped bodies 162, the plurality of second strip-shaped bodies 162 are arranged side by side, and the adjacent second strip-shaped bodies 162 are mutually contacted; the width of the first stripe 161 is greater than that of the second stripe 162.
The curved surface of the first strip 161 is a light incident surface, and the curved surface of the second strip 162 is a light emergent surface, so that light enters from a large curved surface and exits from a small curved surface, thereby collecting light and reducing the emission angle of the light.
Further, at least part 162 of the second strip is arranged 161 at the interface between the first strips. The light collection effect is improved.
The working principle of the first preferred implementation is as follows:
firstly, a light source (a light emitting part 14) in the light source component emits light, the light is subjected to primary condensation through a condensation cup 15 to reduce the divergence angle of the light, and then the light subjected to the primary condensation is subjected to secondary condensation through a condensation lens 16 to further reduce the emission angle of the light;
then, a part of the light emitted from the light source assembly is directly radiated to the double-sided prism diffusion plate 12, the other part of the light emitted from the light source assembly is radiated to the reflective back plate 11, and then the diffuse reflection processing is carried out on the reflective back plate 11, and the light is radiated to the double-sided prism diffusion plate 12;
finally, the light radiated to the double-sided prism diffusion plate 12 forms a surface light source and emits light through the scattering effect of the double-sided prism diffusion plate 12.
This completes the operation of the first preferred embodiment.
Referring to fig. 3 to 5, in the second preferred embodiment, the reflective back plate 21 includes a diffusing surface for diffusing part of the light emitted from the light source module and radiating the light to the double-sided prism diffuser plate 22; the double-sided prism diffusion plate 22 is used for scattering light reflected by the reflective back plate 21 and part of light emitted by the light source assembly and emitting light, and is arranged at the front end of the diffuse reflection surface of the reflective back plate 21; the light source assembly is used for providing a light source for the backlight module, emitting light to the reflecting back plate 21 and the double-sided prism diffusion plate 22, is arranged between the reflecting back plate 21 and the double-sided prism diffusion plate 22 and is positioned on one side of the front end of the diffuse reflection surface of the reflecting back plate 21, or is positioned on two sides of the front end of the diffuse reflection surface of the reflecting back plate 11; the brightness enhancement film 28 is arranged on the light-emitting side of the double-sided prism diffusion plate 22; the frame 29 is disposed on the periphery of the reflective back plate 21.
The light source assembly comprises a PCB (printed circuit board) 23, a light source 24 arranged on the PCB 23 and a light condensing unit arranged in the light emitting direction of the light source 24. The PCB circuit board 23 is disposed on a side of the bezel 29 facing the reflective backplane 21.
The difference from the first preferred embodiment is that: the light source 24 is a light emitting element 24 emitting light of three colors of red/green/blue, and the light condensing unit includes a light mixing shade 25 covering the light emitting element 24 and a light condensing element covering the outer peripheral side of the light mixing shade 25 for reducing the light divergence angle of the light emitting element 24.
The light emitting component 24 is a combination of a red LED lamp 241, a green LED lamp 242 and a blue LED lamp 243, and the light condensing component is a combination of a light condensing cup 26 and a light condensing lens 27.
The red LED lamp 241, the green LED lamp 242, and the blue LED lamp 243 are distributed in a triangular shape, the condensing cup 26 covers the outer peripheral side of the light mixing shade 25, and the condensing lens 27 is disposed at the light exit of the condensing cup 26.
This second preferred embodiment adopts the three-colour color light source, can produce diversified color output to three-colour LED lamp adopts the color sequence method to calculate, utilizes the characteristic that human vision persists, reaches full-color effect. Thereby improving the color of the display.
The light mixing shade 25 is used for uniformly mixing three colors of light, thereby obtaining uniformly mixed white light. Wherein the surface of the light-mixing shade 25 is provided with a large number of microstructures for mixing light.
The structure of the condenser lens 27 in the present second preferred embodiment corresponds to the structure of the condenser lens of the first preferred embodiment.
The working process of the second preferred embodiment is as follows:
firstly, a light source (a light emitting part 24) in the light source component emits three-color light, the three-color light is mixed by a light mixing cover 25 and then emits uniform white light, the light is subjected to primary condensation by a light condensation cup 26 to reduce the divergence angle of the light, and then the light subjected to the primary condensation is subjected to secondary condensation by a light condensation lens 27 to further reduce the emission angle of the light;
then, a part of the light emitted from the light source assembly is directly radiated to the double-sided prism diffusion plate 22, the other part of the light emitted from the light source assembly is radiated to the reflective back plate 21, and then the light enters the reflective back plate 21 for diffuse reflection processing, and the light is radiated to the double-sided prism diffusion plate 22;
finally, the light radiated to the double-sided prism diffusion plate 22 forms a surface light source and emits light by the scattering effect of the double-sided prism diffusion plate 22.
This completes the operation of the second preferred embodiment.
The invention also relates to a display device which comprises a display panel and the lateral entrance type backlight module.
Compared with the backlight module in the prior art, the side-in backlight module and the display device provided by the invention have the advantages that the light reflected by the light reflecting back plate and part of the light emitted by the light source assembly are subjected to scattering treatment and form surface light source light emission through the combined arrangement of the light source assembly, the light reflecting back plate and the double-sided prism diffusion plate; the technical problem of current side income formula backlight unit and display device have the light efficiency not good because of the light guide plate, and then influence the display color is solved.
Although the disclosure has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. The present disclosure includes all such modifications and alterations, and is limited only by the scope of the appended claims. In addition, while a particular feature of the disclosure may have been disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of the other implementations as may be desired and advantageous for a given or particular application. Furthermore, to the extent that the terms "includes," has, "" contains, "or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term" comprising.
In summary, although the present invention has been disclosed in the foregoing embodiments, the serial numbers before the embodiments, such as "first" and "second", are used for convenience of description only, and do not limit the sequence of the embodiments of the present invention. Furthermore, the above embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be limited by the appended claims.
Claims (10)
1. A side-in backlight module, comprising:
the light reflecting back plate comprises a diffuse reflection surface and is used for performing diffuse reflection treatment on part of light rays emitted by the light source assembly and radiating the light rays to the double-sided prism diffusion plate;
the double-sided prism diffusion plate is used for scattering light rays reflected by the reflecting back plate and part of light rays emitted by the light source assembly and emitting light, and is arranged at the front end of the diffuse reflection surface of the reflecting back plate; and
the light source assembly is used for providing a light source for the backlight module and emitting light to the reflecting back plate and the double-sided prism diffusion plate, is arranged between the reflecting back plate and the double-sided prism diffusion plate and is positioned on one side of the front end of the diffuse reflection surface of the reflecting back plate, or is positioned on two sides of the front end of the diffuse reflection surface of the reflecting back plate;
the light source assembly comprises a light source and a light condensing unit arranged in the light outlet direction of the light source, the light condensing unit comprises a light condensing assembly used for reducing the light emitting angle of the light source, the light condensing assembly is a combination of a light condensing cup and a light condensing lens, the light condensing cup is covered on the light source, and the light condensing lens is arranged at the light outlet of the light condensing cup.
2. The edge-type backlight module of claim 1, wherein the light source is a white light emitting component.
3. The edge-lit backlight module of claim 2, wherein the white light emitting component is an LED lamp and the light collection cup is disposed over the LED lamp.
4. The edge-type backlight module as claimed in claim 1, wherein the light source is a light-emitting device emitting red/green/blue light, the light-collecting unit includes a light-mixing cover covering the light-emitting device, and the light-collecting cup covers an outer periphery of the light-mixing cover.
5. The edge-lit backlight module of claim 4, wherein the light emitting elements are a combination of red, green and blue LED lamps;
the red light LED lamp, the green light LED lamp and the blue light LED lamp are distributed in a triangular shape.
6. The edge-type backlight module as claimed in claim 3 or 5, wherein the condensing lens comprises an incident side and an emergent side, the incident side is provided with a plurality of first semi-cylindrical strips, the plurality of first strips are arranged side by side, and adjacent first strips are in contact with each other; a plurality of semi-cylindrical second strip-shaped bodies are arranged on the light emergent side, the plurality of second strip-shaped bodies are arranged side by side, and the adjacent second strip-shaped bodies are mutually contacted;
the width of the first strip is greater than the width of the second strip.
7. The edge-type backlight module of claim 6, wherein at least a portion of the second bars are disposed at the intersection between the first bars.
8. The edge-type backlight module of claim 1, wherein the diffuse reflection surface of the light-reflecting back plate is provided with a micro-structure for diffuse reflection.
9. The edge-type backlight module of claim 1, wherein the edge-type backlight module comprises a brightness enhancement film disposed on a light-emitting side of the double-sided prism diffuser plate and a frame disposed on a peripheral side of the reflective back plate, and the light source assembly is disposed on a side of the frame facing the reflective back plate.
10. A display device comprising a display panel, wherein the display device further comprises the lateral backlight module of any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810928655.3A CN109061942B (en) | 2018-08-15 | 2018-08-15 | Side-in backlight module and display device |
| PCT/CN2018/104258 WO2020034275A1 (en) | 2018-08-15 | 2018-09-06 | Edge-type backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810928655.3A CN109061942B (en) | 2018-08-15 | 2018-08-15 | Side-in backlight module and display device |
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| CN109061942A CN109061942A (en) | 2018-12-21 |
| CN109061942B true CN109061942B (en) | 2021-03-23 |
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| CN201810928655.3A Active CN109061942B (en) | 2018-08-15 | 2018-08-15 | Side-in backlight module and display device |
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| CN (1) | CN109061942B (en) |
| WO (1) | WO2020034275A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109976037B (en) * | 2019-04-04 | 2021-12-03 | Tcl华星光电技术有限公司 | Lateral backlight source and display device thereof |
| CN110432024A (en) * | 2019-07-22 | 2019-11-12 | 华南理工大学 | It is a kind of with condenser without light guide plate side entering type RGB COB light source device |
| CN110515236A (en) * | 2019-08-20 | 2019-11-29 | 深圳市华星光电技术有限公司 | Backlight module and display device |
| CN110822325A (en) * | 2019-11-25 | 2020-02-21 | 华南理工大学 | High-uniformity lateral-entering type LED plant illumination light source without light guide plate |
| CN113219730A (en) * | 2021-05-17 | 2021-08-06 | 嘉兴追光智能科技有限公司 | White light LED lighting lamp |
| CN115327818A (en) * | 2022-08-31 | 2022-11-11 | 义乌清越光电技术研究院有限公司 | Backlight module, preparation method of backlight module and display device |
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| CN106842701A (en) * | 2017-01-11 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of backlight module and liquid crystal display |
| CN108361603A (en) * | 2018-05-11 | 2018-08-03 | 北京创格致通科技有限公司 | A kind of optically focused searchlight and its means of illumination |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109061942A (en) | 2018-12-21 |
| WO2020034275A1 (en) | 2020-02-20 |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Applicant after: TCL China Star Optoelectronics Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Applicant before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |
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