CN204190885U - Splice displaying system, LED liquid crystal display and television set - Google Patents
Splice displaying system, LED liquid crystal display and television set Download PDFInfo
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Abstract
The utility model discloses a kind of splice displaying system, LED liquid crystal display and television set.Wherein, comprise: display screen according to splice displaying system of the present utility model, display screen is at least connected in series mutually by two display units, each display unit all to having master controller, for showing the image information from this master controller; Master controller, the display unit corresponding with it connects, for obtaining the relative position of the quantity of the display unit of mutually series connection, resolution parameter and display unit and other display units, and according to the display unit quantity of the display unit corresponding with it, the resolution parameter of display unit and relative position, cutting is carried out to the image information of input and obtains partial picture information.The utility model solves transport that prior art uses single panel to cause on large scale TV, installs difficulty, and resolution is fixed can not according to the technical problem of customization.
Description
Technical field
The utility model relates to display field, in particular to a kind of splice displaying system, LED liquid crystal display and television set.
Background technology
High definition is the main flow of current autonomous emitting led Display Technique from the LED television of main light emission, Ultra fine pitch is realized from the LED display panel of main light emission, the functions such as high definition physical resolution, and color representation ability is strong, GTG and contrast advantages obvious, be suitable for the signal and the image that show various video interface form completely, current 100 inches and the display screen of high definition or full HD physical resolution can be realized above, and compared to the TV of other large-sizes, as liquid crystal, plasma shows, be made up of monolithic panel often, physical resolution is fixed, for the transport of TV, assembling etc. brings difficulty, in the middle of use, flexibility is also poor.
In current existing display TV, the display TV of large-size, be made up of monolithic display floater often, this display floater be generally the physical resolution of standard as 1920x1080,1366x768 etc., the length and width size of TV is fixed, first this TV is at large-size, have larger difficulty when transporting and install, and flexibility is poor, the TV that can not carry out user flexibility customization physical resolution uses.Such as require to realize 4Kx1K, the TV of 8Kx4K physical resolution user, and even require the TV realizing high clear physical resolution, there is very large difficulty, this brings larger restriction to use.In addition, general LCD, PDP etc. adopt the customization TV that elementary cell splicing realizes, often can not realize seamless spliced, and during these display devices employing tiled display, leave obvious black surround splicing seams in stitching portion, this brings obvious uncomfortable part to viewing visual perception.
The shortcoming of existing technology have at least following some:
1, large scale TV can only transport as entire panel, installs.Can not dismantle as elementary cell carries out installation and transportation, at 100 inches and transport above, assembling difficulty.
2, the physical resolution of TV is fixed, and the tv product difference of different physical resolution is very large, can not realize the high definition of various standard flexibly, the physical resolution TV of high clear and user flexibility customization.
3, adopt the TV of spliced realization, can not realize the television-viewing of seamless spliced globality, splicing black surround brings discomfort to visual sense feeling.
4, the TV display of high clear more than 4Kx2K physical resolution cannot also be realized at present.
Can only integral replacing if 5 have bad point to keep in repair.
The transport caused for using single panel in prior art on large scale TV, installation difficulty, resolution is fixed and according to the problem of customization, can not yet be proposed effective solution at present.
Utility model content
Main purpose of the present utility model is to provide a kind of splice displaying system, LED liquid crystal display and television set, with solve on large scale TV, use single panel to cause transport, install difficulty, resolution is fixed can not according to the problem of customization.
To achieve these goals, according to an aspect of the utility model embodiment, a kind of splice displaying system is provided.Comprise according to splice displaying system of the present utility model: display screen, display screen is at least connected in series mutually by two display units, each display unit all to having master controller, for showing the image information from this master controller; Master controller, the display unit corresponding with it connects, for obtaining the relative position of the quantity of the display unit of mutually series connection, resolution parameter and display unit and other display units, and according to the display unit quantity of the display unit corresponding with it, the resolution parameter of display unit and relative position, cutting is carried out to the image information of input and obtains partial picture information.
To achieve these goals, according to another aspect of the utility model embodiment, provide a kind of LED liquid crystal display.Comprise according to LED liquid crystal display of the present utility model: display screen, display screen is at least connected in series mutually by two display units, each display unit all to having master controller, for showing the image information from this master controller; Master controller, the display unit corresponding with it connects, for obtaining the relative position of the quantity of the display unit of mutually series connection, resolution parameter and display unit and other display units, and according to the display unit quantity of the display unit corresponding with it, the resolution parameter of display unit and relative position, cutting is carried out to the image information of input and obtains partial picture information.
To achieve these goals, according to another aspect of the utility model embodiment, a kind of television set is provided.Comprise according to television set of the present utility model: display screen, display screen is at least connected in series mutually by two display units, each display unit all to having master controller, for showing the image information from this master controller; Master controller, the display unit corresponding with it connects, for obtaining the relative position of the quantity of the display unit of mutually series connection, resolution parameter and display unit and other display units, and according to the display unit quantity of the display unit corresponding with it, the resolution parameter of display unit and relative position, cutting is carried out to the image information of input and obtains partial picture information.
By the utility model, display screen, display screen is at least connected in series mutually by two display units, each display unit all to having master controller, for showing the image information from this master controller; Master controller, the display unit corresponding with it connects, for obtaining the relative position of the quantity of the display unit of mutually series connection, resolution parameter and display unit and other display units, and according to the display unit quantity of the display unit corresponding with it, the resolution parameter of display unit and relative position, cutting is carried out to the image information of input and obtains partial picture information, solve in prior art on large scale TV, use single panel to cause transport, install difficulty, resolution is fixed can not according to the problem of customization.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the splice displaying system according to the utility model embodiment;
Fig. 2 is the screen connection diagram according to the utility model embodiment;
Fig. 3 is the structural representation of a kind of preferred splice displaying system according to the utility model embodiment;
Fig. 4 is the image processor handling principle schematic diagram according to the utility model embodiment; And
Fig. 5 is according to the utility model embodiment display controller handling principle schematic diagram.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
The utility model scheme is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the embodiment of the utility model part, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the utility model protection.
It should be noted that, term " first ", " second " etc. in specification of the present utility model and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case so that embodiment of the present utility model described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
In the configuration that it is the most basic, Fig. 1 is the structural representation of the splice displaying system according to the utility model embodiment.For purposes of illustration, the architecture of painting is only an example of proper environment, not proposes any limitation to the scope of application of the application or function.This computing system should be interpreted as, to the arbitrary assembly shown in Fig. 1 or its combination, there is any dependence or demand yet.
As shown in Figure 1, the splice displaying system that the application provides comprises: display screen 10, master controller 12.
Wherein, display screen 10, display screen is at least connected in series mutually by two display units, each display unit all to having master controller, for showing the image information from this master controller; Master controller 12, the display unit corresponding with it connects, for obtaining the relative position of the quantity of the display unit of mutually series connection, resolution parameter and display unit and other display units, and according to the display unit quantity of the display unit corresponding with it, the resolution parameter of display unit and relative position, cutting is carried out to the image information of input and obtains partial picture information.
Analyze known, in each display unit, contain a master controller.When display unit and other display units are connected in series mutually, current display unit respectively by corresponding with it the first master controller obtain the display unit of series connection mutually total quantity, with the resolution parameter of its display unit of mutually connecting and the relative position of this display unit and other display units.
The first master controller corresponding to current display unit is according to the resolution parameter of other display units of mutually connecting with current display unit got and current display unit and the relative position residing for other display units are in the connection of mutually connect, the image information of input is sheared, shear out applicable current display unit resolution, and the partial picture information corresponding with the relative position residing for current display unit, for the current display unit display corresponding to the first master controller.
The step that the above embodiments of the present application provide can be used on master controller 12, for each display unit configures a master controller.When two or more display unit is connected mutually, and when an image information is shown, first master controller of present displays by get with the relative position residing for the quantity of its display of mutually connecting, resolution parameter and this display unit, the image information of entirety is sheared, shear out the partial picture information of total painting surface information corresponding to this display unit present position, and it is shown.
In actual applications, as shown in Figure 2, for the picture of the display unit tiled display 1920*1080 that is 960*540 by 4 resolution, when above-mentioned 4 display units carry out series connection splicing mutually with the method for 2*2, assuming that relative position residing for current display unit is upper right side, then the master controller of this display unit can read, read the resolution of other display units and reading to the relative position residing for this display the quantity of series connection display unit, calculates the image-region shown by current display unit.The display image region of the local message that this current display unit should show is original picture information x-axis the 961st pixel to the 1920th pixel, y-axis the 0th pixel to the partial picture information of the 540th pixel region.
Preferably, in the scheme that the above embodiments of the present application provide, master controller 12 comprises: first processor 121.
Wherein, first processor 121, distributes screen coding for the order of connection according to display unit successively to current display unit.
By first processor, the order of connection of master controller to the display unit of series connection mutually reads, and distributes corresponding screen coding to each display unit successively according to the order of connection.
In the middle of practical application, or for the picture of the display unit tiled display 1920*1080 that is 960*540 by 4 resolution, the order of connection of 4 display units is obtained, and successively to these display unit allocated code, by these codings, can arrange the position of these 4 display units more easily.
Preferably, in the above embodiments of the present application, master controller 12 comprises: video input interface 123, video output interface 125.
Wherein, video input interface 123, video output interface 125, the video input interface of current display unit be connected in series in the video output interface of a upper display unit be connected.For transmitting the image information for display unit display.
Preferably, in the above embodiments of the present application, video input interface 123 and the video output interface 125 of master controller 12 comprise:
First sub-video input interface 1231, second sub-video input interface 1233; First sub-video output interface 1251, second sub-video output interface 1253.A video input interface and video output interface are the spare interface of another video input interface and video output interface.
Above-mentioned two video input interfaces and two video output interfaces, by two video input interfaces and two video output interfaces of master controller corresponding to each display unit, when one of them video input interface fault, when normally cannot receive image information, master controller can automatically switch to and obtain image information from another video input interface.By the method that two circuits back up mutually, tiled display can be made to have better stability.
Further, display unit can also by judging according to the position relationship of the connected mode of mutually connecting to two display units in front and back of mutually connecting with the master controller corresponding to it.When the first sub-video output interface of last display unit is connected with the first sub-video input interface of second display unit, then First display unit and second display unit according to the sequencing of encoding carry out transversely arranged; When the first sub-video output interface of last display unit is connected with the second sub-video input interface of second display unit, then the longitudinal arrangement that carries out according to the sequencing of encoding of First display unit and second display unit.By said method, directly by the order of connection of cable, the position relationship of screen can be set.
Preferably, in the above embodiments of the present application, master controller comprises 12 and comprises: network interface 127.
Wherein, network interface 127, comprises a network input interface 1271 and a networking output interface 1273, and network input interface and networking output interface are used for the information transmission between display unit.
When the connected mode mode of series connection is mutually wire connection, the master controller that each display unit is corresponding includes: a network input interface and a networking output interface, and network input interface and networking output interface are used for the information transmission between display unit.Wherein, information at least comprises: network configuration information, position of display unit information, display unit type information, display unit resolution information.
In the middle of practical application, staff can directly by the network input interface on master controller corresponding to each display unit and networking output interface, every platform display unit is configured or is managed, thus the unified management achieved multiple stage display unit and unified configuration.Each display unit by the network input port on the master controller corresponding with it and network output mouth, can also read the information of other display units, thus realizes the data interaction between each display unit.
Preferably, in the above embodiments of the present application, each display unit is connected mutually, and wherein connected mode is that wire connects and/or wireless connections.
In the middle of practical application, the mode that wire connects can comprise: the connected modes such as HDMI wire connection, the connection of DP line, VGA line connection.Wireless connections can comprise: the connected modes such as wifi connection, bluetooth connection.
Preferably, in the above embodiments of the present application, splice displaying system also comprises: memory 14.
Wherein, memory 14 is connected with master controller 12, for storing the model of existing display unit and the type information corresponding with the model of affiliated display unit and resolution information.
In memory 14, the parameter of the display unit such as type information, resolution parameter of display unit can be stored in the middle of master controller, when multiple display unit is connected mutually, the first master controller corresponding to current display unit directly can read the storage in other master controllers by network input interface, obtain display unit information and resolution information.
Further, when display unit dispatches from the factory, the every terms of information of existing all display units can be deposited in master controller.When multiple display unit is connected mutually, the first master controller corresponding to current display unit only needs the type information of the master controller directly being read other display units by network input interface, and master controller directly can be stored in resolution information corresponding with this model in master controller by inquiry.
Preferentially, in the above embodiments of the present application, if Fig. 3 is the structural representation of a kind of preferred splice displaying system according to the utility model embodiment, as shown in Figure 3, master controller 12 comprises: image processor 129, display controller 131.
Wherein, image processor 129, is connected with master controller, processes for the image shown current display unit figure; Display controller 131, is connected with master controller, controls for the image quality shown current display unit.
In the middle of practical application, image processor 129, as shown in Figure 4, image processor comprises the decoding deciphering control to HDMI, image de interlacing and zoom function, the coding of HDMI and distribution, the functions such as the intercepting of image, be M*N for display unit module physical resolution, when input video resolution is greater than M*N, intend taking to intercept the mode carrying out showing in video area, such as display unit module is 960*540, when input resolution is 1920*1080, if display image area is X (0-959), time Y (0-479), be (0 with the most upper left corner of effective image, 0) point, then can be configured by the intercepting coordinate of network interface to image with the viewing area of cut-away view picture at unit display module.When realizing display unit module and carrying out being spliced into TV, the image-region that corresponding real unit module display is corresponding, thus the overall input video in region of composition TV through digital visual interface as after HDMI carries out system, decode through HDMI, and after can the deciphering of HDCP being carried out, by reading the relevant information of decoded video, the frame per second of such as video, resolution, whether interlace signal, de interlacing process is carried out to interlaced video signal, by carrying out corresponding convergent-divergent by image scaling function after de interlacing, such as video is enlarged into 1920x1080 by other resolution, or being scaled resolution is 1280x720, image synchronization intercepting is carried out after carrying out corresponding convergent-divergent, the intercepting of image needs frame memory, the coordinate of synchronous intercepting is configured by user.In this series of module, carry out video parameter reading by network interface, the switch of de-interlacing function, the switch of image scaling and the target resolution of convergent-divergent, the block coordinate etc. of configuration image.In addition, HDMI decodes and after deciphering, directly exports HDMI coding and the rear output of HDCP encryption to via programmable logic device.
In the middle of practical application, as shown in Figure 5, the display controller that the utility model proposes be mainly used in about LED television panel Data Control and drive process.The video data of Part II is exported by image processor, this video data is the Zone Full image that actual displayed unit module needs display, after carrying out sync buffering via data buffer, be input to Data Control core to process, and carry out Frame storage, memory address stores according to predetermined queueing discipline, load the parameter of pixel single point correction when each system electrification to frame memory simultaneously, due to pixel carry out single point correction time, the corresponding one group of corresponding correction data of each pixel, therefore Data Control nucleus module often reads a pixel data in frame memory, all to read its corresponding correction data follow-uply to do the process of pixel single point correction, such as, reads pixel data is RGB, so will read its correction data is DLr, DLg, DLb.Due to the pixel of fixed physical position on correction data only corresponding LED television, and video pixel is synchronously real-time, therefore the same whole correction datas of two frame memories are write in the disposable loading that powers on, follow-up the correction data that need read correspondence position along with video data, but video data constantly writes and reads, adopt the mode of ping-pong operation in units of the field duration, carry out the switching of frame memory.After video data deposits reading from frame, first carry out gamma correction.Formula is as follows:
In above-mentioned formula, the wherein tonal gradation of x representative input pixel, y is the pixel grey scale grade exported, K is the peak of input pixel class, and such as during 0-255 level gray scale, K is 255, during 0-1023 level gray scale, K is 1023 etc., and N is the peak of output pixel grade.As inputted pixel RGB, when monochrome is 10bit, i.e. 0-1023 level gray scale, when exporting RGB sub-pix monochrome 16bit, i.e. 0-65535 level gray scale, so K is 1023, N is 65535.After gamma transformation, then carry out the process of pixel single point correction, the Matrix Formula of calculating is as follows:
R
out＝R
in*D
RL
R+G
in*D
GL
R+B
in*D
BL
R
G
out＝R
in*D
RL
G+G
in*D
GL
G+B
in*D
BL
G
B
out＝R
in*D
RL
B+G
in*D
GL
B+B
in*D
BL
B
Wherein D
rl
r, D
gl
r, D
bl
rfor the correction coefficient of sub-pix redness, the like, have green, blue sub-pix correction data, the redness of each output pixel all has the redness of input, green, carries out colour mixture and form after blueness carries out correction coefficient weighting.After carrying out single point correction, carry out brightness adjustment:
R
out＝R
in*R
coe
G
out＝G
in*G
coe
B
out＝B
in*B
coe
In above-mentioned formula, wherein B
coe, G
coe, R
coefor brightness adjustment coefficient, correspond to blue, green, red brightness adjustment coefficient.The brightness of full screen is adjusted by adjusting corresponding coefficient.Finally enter into the lighting driving that LED particle carries out LED.The display unit module that relates to that the utility model proposes builds the crucial major part of LED television, the mode that the resolution of LED television can adopt basic display unit to splice, and realizes the LED television device of its integral multiple physical resolution.If display unit module is 960*540, the LED display of 1920x1080 physical resolution so can be realized by the mode of 2*2.
Preferably, in the above embodiments of the present application, said system can be applied in the middle of light-emitting diode display.
Preferably, in the above embodiments of the present application, said system can be applied in the middle of television set.
For the splice displaying system that the utility model proposes, the television equipment of any one resolution of its horizontal and vertical resolution integral multiple can be realized flexibly, greatly user-friendly, and realize the cost of various Definition TV device.
After multiple standard television splicing (display unit) is become large scale TV or video wall, software systems can realize:
1, automatic address distributes: master controller can automatically and each display unit shake hands, and be that each unit distributes unique ID and encodes.
2, guide software that operating personnel can be made to complete the segmentation of picture coordinate and the splicing of each display unit fast.
3, integrated embedded system and memory device, records all dispatching from the factory and reorganizes and outfit parameter.At the scene after assembling, without the need to addressing and picture segmentation, just can come into operation at once.
Key point of the present utility model is to realize splice displaying system, basic display unit is adopted to realize the television equipment method of the various resolution of seamless spliced type, high definition can be realized, the LED television method of high clear 4K*2K and above resolution thereof, the system schema of basic display unit is also the epochmaking key point of the utility model simultaneously.
It should be noted that, for aforesaid each embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the utility model is not by the restriction of described sequence of movement, because according to the utility model, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action and module might not be that the utility model is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
In several embodiments that the application provides, should be understood that, disclosed device, the mode by other realizes.Such as, device embodiment described above is only schematic, the such as division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the utility model can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that the technical solution of the utility model contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprises all or part of step of some instructions in order to make a computer equipment (can be personal computer, mobile terminal, server or the network equipment etc.) perform method described in each embodiment of the utility model.And aforesaid storage medium comprises: USB flash disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), portable hard drive, magnetic disc or CD etc. various can be program code stored medium.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (10)
1. a splice displaying system, is characterized in that, comprising:
Display screen, described display screen is at least connected in series mutually by two display units, each described display unit all to having master controller, for showing the image information from this master controller;
Master controller, the described display unit corresponding with it connects, for obtaining the relative position of the quantity of the described display unit of described mutual series connection, resolution parameter and described display unit and display unit described in other, and according to the resolution parameter of the described display unit quantity of the described display unit corresponding with it, described display unit and described relative position, cutting is carried out to the image information of input and obtains partial picture information.
2. system according to claim 1, it is characterized in that, described master control comprises:
First processor, distributes screen coding for the order of connection according to described display unit successively to current described display unit.
3. system according to claim 1, it is characterized in that, described master control comprises:
Video input interface, video output interface, wherein, the described video input interface of current described display unit be connected in series in the video output interface of a upper described display unit be connected, for transmitting the image information shown for described display unit.
4. system according to claim 3, it is characterized in that, described video input interface and described video output interface comprise:
First sub-video input interface, the second sub-video input interface, the first sub-video output interface, the second sub-video output interface; Wherein, a described video input interface and described video output interface are the spare interface of another video input interface and video output interface.
5. system according to claim 1, it is characterized in that, described master controller comprises:
Network interface, wherein, described network interface comprises a network input interface and a networking output interface, and described network input interface and described networking output interface are used for the information transmission between described display unit.
6. system according to claim 1, it is characterized in that, described in each, display unit is connected mutually, and wherein connected mode is that wire connects and/or wireless connections.
7. system according to claim 1, it is characterized in that, described splice displaying system comprises:
Memory, described memory is connected with described master controller, for storing the model of existing described display unit and the type information corresponding with the model of affiliated display unit and resolution information.
8. system according to claim 1, it is characterized in that, described master controller comprises:
Image processor, is connected with master controller, processes for the image shown current display unit figure;
Display controller, is connected with master controller, for controlling the image quality of current described display unit display.
9. a LED liquid crystal display, comprises the splice displaying system in above-mentioned 1 to 8 described in any one.
10. a television set, comprises the splice displaying system in above-mentioned 1 to 8 described in any one.
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| CN201420628258.1U Active CN204190885U (en) | 2014-09-19 | 2014-10-27 | Splice displaying system, LED liquid crystal display and television set |
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| CN104301645A (en) | 2015-01-21 |
| CN104301645B (en) | 2018-12-28 |
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Effective date of registration: 20161118 Address after: 100176 Beijing City, Daxing District branch of Beijing economic and Technological Development Zone, fourteen Street No. 99 building 33 D two storey building No. 2136 (central office) Patentee after: LEYARD TV TECHNOLOGY CO., LTD. Address before: 100091 Beijing, the Summer Palace, north of the north is red flag No. 9 West Street, Haidian District Patentee before: Leyard Photoelectric Co., Ltd. |