CN206893223U - Led display screen system - Google Patents
Led display screen system Download PDFInfo
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- CN206893223U CN206893223U CN201720475301.9U CN201720475301U CN206893223U CN 206893223 U CN206893223 U CN 206893223U CN 201720475301 U CN201720475301 U CN 201720475301U CN 206893223 U CN206893223 U CN 206893223U
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Abstract
The utility model discloses a kind of LED display screen system; belong to display screen technology field; the system includes host computer, sends control card and LED screen main body; LED screen main body includes the LED box of some matrix arrangements; each LED box includes some LED modules for receiving card and some matrix arrangements; each LED module includes current-limiting protection module, and some reception cards of the host computer through transmission control card and each LED box realize the electric connection with each LED module.LED display screen system of the present utility model can realize module level current-limiting protection, the hidden danger such as heating, on fire caused by dramatically reducing high current.
Description
Technical field
Display screen technology field is the utility model is related to, more particularly to a kind of LED display screen system.
Background technology
LED display screen system, important role is served as in information age today, however, existing LED display screen system,
During permanent use, it sometimes appear that various anomalies, for example computer blue screen is played, single casing interim card,
There are the states such as chip is dull in cell board, and these anomalies can allow display screen to recover just by the action of electrification reset
Often, now, the design based on existing LED display screen system, common practices is can only be by sending staff to be closed to scene
Disconnected power input is restarted to solve this problem firmly, so, can not only spend substantial amounts of manpower and materials, and
Easily there is large area blank screen, cause the influence of larger display output.In addition, existing LED display screen system, has due to lacking
The current-limiting protection mechanism of effect, during the permanent use of display screen, display screen is caused to generate heat it sometimes appear that electric current is excessive, very
To display screen fire is triggered, great manpower, financial losses are brought.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of LED display screen system, and it can realize module level current limliting
Protection, the hidden danger such as heating, on fire caused by dramatically reducing high current.
In order to solve the above-mentioned technical problem, specifically, the technical solution of the utility model is as follows：
A kind of LED display screen system, including host computer, transmission control card and LED screen main body, the LED screen main body bag
The LED box of some matrix arrangements is included, each LED box includes some LED modules for receiving card and some matrix arrangements,
Each LED module includes current-limiting protection module, and the host computer is through the transmission control card and each LED box
It is some to receive card realization and the electric connection of each LED module.
Preferably, the current-limiting protection module includes：Sampled voltage generation unit, after detecting operating current Ix, lead to
Resistance sampling is crossed to produce sampled voltage Vx；Reference voltage setup unit, for carrying out reference voltage Vs setting；Compare output
Unit, for the sampled voltage Vx and the reference voltage Vs to be compared into amplification, and exceed setting in the operating current Ix
Cut-off signals are exported during electric current I；Current limited Control unit, for controlling the grid of metal-oxide-semiconductor by the cut-off signals, so as to control
Break-make between the drain electrode of the source electrode and metal-oxide-semiconductor of metal-oxide-semiconductor processed, to reach current-limiting protection purpose.
A kind of LED display screen system, including the host computer with reset operational module, transmission control card and LED screen main body,
The LED screen main body includes the LED box of some matrix arrangements, and each LED box includes some reception cards and some squares
The LED module of battle array arrangement, each LED module include power management module and current-limiting protection module, and the host computer is through institute
State the realization of some reception cards and the electric connection of each LED module for sending control card and each LED box so that
The power management module of each LED module is under the remote control of the reset operational module to the corresponding LED moulds
Group carries out electrification reset action.
Preferably, the current-limiting protection module includes：Sampled voltage generation unit, after detecting operating current Ix, lead to
Resistance sampling is crossed to produce sampled voltage Vx；Reference voltage setup unit, for carrying out reference voltage Vs setting；Compare output
Unit, for the sampled voltage Vx and the reference voltage Vs to be compared into amplification, and exceed setting in the operating current Ix
Cut-off signals are exported during electric current I；Current limited Control unit, for controlling the grid of metal-oxide-semiconductor by the cut-off signals, so as to control
Break-make between the drain electrode of the source electrode and metal-oxide-semiconductor of metal-oxide-semiconductor processed, to reach current-limiting protection purpose.
Preferably, the reference voltage setup unit be based on chip LM431 form voltage regulator circuit, the comparison
Output unit is the discharge circuit formed based on chip LM2904, and the Current limited Control unit is to be formed based on chip MT8103
Metal-oxide-semiconductor on-off circuit.
Preferably, the power management module includes：Reset signal inputs amplifying unit, for described reset to be manipulated into mould
The power-on reset signal that block sends over carries out isolation amplification；Resetting voltage output unit, for by isolating after amplifying
The triggering of reset signal makes the resetting voltage of the LED module progress electrification reset to acquire.
Preferably, the reset signal input amplifying unit is the two-stage amplifying circuit formed based on two triodes.
Preferably, the resetting voltage output unit is the DC-DC change-over circuits formed based on chip AOZ1016, described
Chip AOZ1016 EN pins are electrically connected with reset signal input amplifying unit.
Preferably, the resetting voltage output unit is metal-oxide-semiconductor on-off circuit.
Preferably, remote network communication connection or medium or short range data are carried out between the host computer and the transmission control card
Communication connection.
LED display screen system provided by the utility model, its every LED mould in each LED box of LED screen main body
Current-limiting protection module is additionally arranged respectively in group so that each LED module can individually be interrupted corresponding when its electric current is excessive
The electric current supply of LED module, to realize module level current-limiting protection, dramatically reduce heating caused by high current, on fire
Etc. hidden danger.Meanwhile it is additionally arranged reset operational module in host computer again, is additionally arranged respectively in each LED module independent
Power management module, so, when a certain LED module of ipc monitor to LED screen main body occurs abnormal, it can pass through
The power management module for resetting the corresponding LED module of operational module remote control of host computer, to carry out replying by cable to the LED module
Position action (carries out soft reboot) to the LED box, and then is allowed to recover normal.It can be seen that this LED display screen system, it both may be used
Module level current-limiting protection is realized, the hidden danger such as heating, on fire caused by dramatically reducing high current；Again can be anti-according to monitoring
The information of feedback, for target abnormal area, target abnormal area can quickly, accurately be realized by host computer remote control
Soft reboot acts, and allows LED display to recover normal, without sending staff to scene, so as to save human and material resources, and pole
The earth reduces blank screen region, reduces the influence to display output.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structured flowchart of the LED display screen system of the utility model first embodiment.
Fig. 2 is the circuit theory diagrams of the current-limiting protection module of LED display screen system shown in Fig. 1.
Fig. 3 is the structured flowchart of the LED display screen system of the utility model second embodiment.
Fig. 4 is the circuit theory diagrams of the power management module of LED display screen system shown in Fig. 3.
Fig. 5 is the circuit theory diagrams of the current-limiting protection module of LED display screen system shown in Fig. 4.
Embodiment
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings.Herein it should be noted that
It is used to help understand the utility model for the explanation of these embodiments, but does not form to restriction of the present utility model.This
Outside, as long as technical characteristic involved in each embodiment of the utility model disclosed below does not form conflict each other
Can is mutually combined.
As shown in figure 1, the utility model first embodiment provides a kind of LED display screen system 1000, the LED display system
System 1000, which includes host computer 1100, transmission control card 1200 and LED screen main body 1300, LED screen main body 1300, includes some squares
The LED box 1310 of battle array arrangement, each LED box 1310 include some LED modules for receiving and blocking 1311 and some matrix arrangements
1312, each LED module 1312 includes current-limiting protection module 13121, and host computer 1100 is through sending control card 1200 and every LED
Some reception cards 1311 of casing 1310 realize the electric connection with each LED module 1312.
In the present embodiment, as shown in Figures 1 and 2, the LED screen main body 1300 in the present embodiment includes 3X3 matrix row
The LED box 1310 of row, each LED box 1310 include 1 and receive the LED module 1312 for blocking 1311 and 2X2 matrix arrangement,
The current-limiting protection module 13121 of each LED module 1312 includes sampled voltage generation unit 131211, reference voltage setup unit
131212nd, output unit 131213 and Current limited Control unit 131214 are compared, wherein, sampled voltage generation unit 131211 is led
It is used for after detecting operating current Ix, by resistance sampling to produce sampled voltage Vx；Reference voltage setup unit 131212 is led
It is used for the setting for carrying out reference voltage Vs；Compare output unit 131213 to be mainly used in sampled voltage Vx and reference electricity
Pressure Vs compares amplification, and exports cut-off signals when operating current Ix exceedes setting electric current I；Current limited Control unit 131214 is led
It is used for the grid that metal-oxide-semiconductor is controlled by the cut-off signals, so as to control between the source electrode of metal-oxide-semiconductor and the drain electrode of metal-oxide-semiconductor
Break-make, to reach current-limiting protection purpose.
Specifically, as shown in Fig. 2 VDD1 is the cell board supply input line of LED module 1312, sealed in this input line
Sampling resistor RS, is input to chip LM2904 the 2nd and the 3rd pin, and amplification forms sampled voltage Vx.Reference voltage setup unit
131212 be the voltage regulator circuit formed based on chip LM431, and chip LM431 is an adjustable shunt regulator in three ends, its
Reference voltage Vs setting is carried out by resistance R2, R3, is input to chip LM2904 the 5th and the 6th pin.It is single to compare output
Member 131213 is the discharge circuit formed based on chip LM2904, a universal operational amplifiers of chip LM2904, passes through core
Sampled voltage Vx and reference voltage Vs are compared amplification by piece LM2904, after operating current Ix exceedes setting electric current I, by pin 7
Cut-off signals will be exported.Current limited Control unit 131214 be based on chip MT8103 form metal-oxide-semiconductor on-off circuit, chip
MT8103 is high-power MOS tube, and during default conditions, U3 (i.e. chip MT8103) is in opening state, when operating current Ix exceedes
After setting electric current I, the cut-off signals can control U3 grid (G), to cause between U3 source electrode (S) and U3 drain electrode (D)
Disconnect, so as to realize the current-limiting protection of corresponding LED module.
In addition, in the present embodiment, remote network communication can be both carried out between host computer 1100 and transmission control card 1200
Connection, can also carry out medium or short range data communication connection, wherein, remote network communication connection includes cable network communication connection and nothing
Gauze network communication connection (such as GPRS network communication, 3G network communication, 4G network services and WiFi network communication), medium or short range
Data communication connection includes serial communication connection etc..
To those skilled in the art, the number of the reception card 1311 in same LED box 1310 is without with LED
The number of module 1312 corresponds, i.e., when being provided with 2x2 matrix arrangement in a LED box 1310 in the present embodiment
Both can only have been set as shown in Figure 1 after LED module 1312, in the LED box 1,310 one receive card 1311, also can be set two or
It is more than two to receive card 1311.
As shown in figure 3, the utility model second embodiment provides a kind of LED display screen system 2000, LED display screen system
2100 are included with host computer 2100, transmission control card 2200 and the LED screen main body 2300 for resetting operational module 2110, LED screen
Main body 2300 includes the LED box 2310 of some matrix arrangements, and each LED box 2310 includes some receive and blocks 2311 and some
The LED module 2312 of matrix arrangement, each LED module 2312 include power management module 23122 and current-limiting protection module
23121, host computer 2100 through send some reception cards 2311 of control card 2200 and each LED box 2310 realize with it is each
The electric connection of LED module 2312 so that the power management module 23122 of each LED module 2312 is resetting operational module
Electrification reset action is carried out to corresponding LED module 2312 under 2110 remote control.
In the present embodiment, as shown in Figures 3 and 4, the LED screen main body 2300 in the present embodiment includes 3X3 matrix row
The LED box 2310 of row, each LED box 2310 include 1 and receive the LED module 2312 for blocking 2311 and 2X2 matrix arrangement,
The power management module 23122 of each LED module 2312 includes reset signal input amplifying unit 231221 and resetting voltage is defeated
Go out unit 231222, wherein, reset signal input amplifying unit 231221 is used to reset what operational module 2110 sended over
Power-on reset signal carries out isolation amplification, and resetting voltage output unit 231222 is then replied by cable on after being amplified by isolation
Position signal triggering makes the resetting voltage of the progress electrification reset of LED module 2312 to acquire.
As shown in figure 4, Reset refers to the power-on reset signal of input in figure, VDD refers to the resetting voltage of output.Reset
Signal input amplifying unit 231221 is the two-stage amplifying circuit formed based on two triodes, specifically can be by triode Q1, Q2
And resistance R1, R2 composition.Resetting voltage output unit 231222 be based on chip AOZ1016 form DC-DC change-over circuits, core
Piece AOZ1016 EN pins are electrically connected with reset signal input amplifying unit 231221.Specifically, the DC-DC change-over circuits
In addition to including chip AOZ1016, include electric capacity C1, C2, C4 of filter action, for compensating parameter, adjustment output voltage
The electric capacity C5 and resistance R5 of dutycycle, form feedback circuit, resistance R3, R4 for adjusting output voltage values and shaping filter effect
Inductance L1.
As depicted in figs. 3 and 5, the current-limiting protection module 23121 of each LED module 2312 includes sampled voltage generation unit
231211st, reference voltage setup unit 231212, compare output unit 231213 and Current limited Control unit 231214, wherein,
After sampled voltage generation unit 231211 is mainly for detection of operating current Ix, by resistance sampling to produce sampled voltage Vx；
Reference voltage setup unit 231212 is used for the setting for carrying out reference voltage Vs；Compare output unit 231213 to be mainly used in this
Sampled voltage Vx and reference voltage Vs compare amplification, and export cut-off signals when operating current Ix exceedes setting electric current I；
Current limited Control unit 231214 is mainly used in controlling the grid of metal-oxide-semiconductor by the cut-off signals, so as to control the source electrode of metal-oxide-semiconductor
Break-make between the drain electrode of metal-oxide-semiconductor, to reach current-limiting protection purpose.
As shown in figure 5, VDD1 is the cell board supply input line of LED module 2312, sampling electricity is sealed in this input line
RS is hindered, is input to chip LM2904 the 2nd and the 3rd pin, amplification forms sampled voltage Vx.Reference voltage setup unit 231212
For the voltage regulator circuit formed based on chip LM431, chip LM431 is an adjustable shunt regulator in three ends, and it passes through electricity
R2, R3 are hindered to carry out reference voltage Vs setting, are input to chip LM2904 the 5th and the 6th pin.Compare output unit
231213 be the discharge circuit formed based on chip LM2904, a universal operational amplifiers of chip LM2904, passes through chip
Sampled voltage Vx and reference voltage Vs are compared amplification by LM2904, will by pin 7 after operating current Ix exceedes setting electric current I
Export cut-off signals.Current limited Control unit 231214 be based on chip MT8103 form metal-oxide-semiconductor on-off circuit, chip
MT8103 is high-power MOS tube, and during default conditions, U3 (i.e. chip MT8103) is in opening state, when operating current Ix exceedes
After setting electric current I, the cut-off signals can control U3 grid (G), to cause between U3 source electrode (S) and U3 drain electrode (D)
Disconnect, so as to realize the current-limiting protection of corresponding LED module.
In addition, in the present embodiment, remote network communication can be both carried out between host computer 2100 and transmission control card 2200
Connection, can also carry out medium or short range data communication connection, wherein, remote network communication connection includes cable network communication connection and nothing
Gauze network communication connection (such as GPRS network communication, 3G network communication, 4G network services and WiFi network communication), medium or short range
Data communication connection includes serial communication connection etc..
During work, as shown in figure 3, when a certain LED module 2312 occurs showing abnormal, you can pass through host computer 2100
Operational module 2110 is resetted to carry out remote control, with for occurring showing that the abnormal LED module 2312 sends electrification reset
Signal, after the power management module 23122 of the LED module 2312 receives the power-on reset signal, the input of its reset signal
The power-on reset signal is carried out isolation amplification by amplifying unit 231221 first, and then, resetting voltage output unit 231222
Then triggered by isolating the power-on reset signal after amplifying to acquire the reset for making the LED module 2312 carry out electrification reset
Voltage, and then make the purpose of the LED module 2312 progress soft reboot, whole reseting procedure can be grasped on host computer 2100
Control is completed, without sending staff to live, so as to save human and material resources, meanwhile, whole reseting procedure is only for showing
Show abnormal LED module 2312, do not interfere with other and show normal LED module 2312, thus blank screen area can be greatly reduced
Domain, reduce the influence to display output.
To those skilled in the art, the number of the reception card 2311 in same LED box 2310 is without with LED
The number of module 2312 corresponds, i.e., when being provided with 2x2 matrix arrangement in a LED box 2310 in the present embodiment
Both can only have been set as shown in Figure 3 after LED module 2312, in the LED box 2,310 one receive card 2311, also can be set two or
It is more than two to receive card 2311.In addition, this resetting voltage output unit 231222 can also use what is formed based on other chips
DC-DC change-over circuits replace, or using metal-oxide-semiconductor on-off circuit (using metal-oxide-semiconductor grid (g) control metal-oxide-semiconductor source electrode (s) and
The circuit of the principle construction of drain electrode (d) break-make) replace, to trigger metal-oxide-semiconductor by isolating the power-on reset signal after amplifying
Switch control, and then obtain making LED box 2310 to carry out the resetting voltage of electrification reset.
LED display screen system provided by the utility model, its every LED mould in each LED box of LED screen main body
Current-limiting protection module is additionally arranged respectively in group so that each LED module can individually be interrupted corresponding when its electric current is excessive
The electric current supply of LED module, to realize module level current-limiting protection, dramatically reduce heating caused by high current, on fire
Etc. hidden danger.Meanwhile it is additionally arranged reset operational module in host computer again, is additionally arranged respectively in each LED module independent
Power management module, so, when a certain LED module of ipc monitor to LED screen main body occurs abnormal, it can pass through
The power management module for resetting the corresponding LED module of operational module remote control of host computer, to carry out replying by cable to the LED module
Position action (carries out soft reboot) to the LED box, and then is allowed to recover normal.It can be seen that this LED display screen system, it both may be used
Module level current-limiting protection is realized, the hidden danger such as heating, on fire caused by dramatically reducing high current；Again can be anti-according to monitoring
The information of feedback, for target abnormal area, target abnormal area can quickly, accurately be realized by host computer remote control
Soft reboot acts, and allows LED display to recover normal, without sending staff to scene, so as to save human and material resources, and pole
The earth reduces blank screen region, reduces the influence to display output.
Embodiment of the present utility model is explained in detail above in association with accompanying drawing, but the utility model is not limited to be retouched
The embodiment stated.For a person skilled in the art, it is right in the case where not departing from the utility model principle and spirit
These embodiments carry out a variety of change, modification, replacement and modification, still fall within the scope of protection of the utility model.
Claims (10)
1. a kind of LED display screen system, it is characterised in that including host computer, send control card and LED screen main body, the LED
Screen main body includes the LED boxes of some matrix arrangements, and each LED box includes some receive and blocked and some matrix arrangements
LED module, each LED module include current-limiting protection module, and the host computer is through the transmission control card and each described
Some reception cards of LED box realize the electric connection with each LED module.
2. a kind of LED display screen system according to claim 1, it is characterised in that the current-limiting protection module includes：
Sampled voltage generation unit, after detecting operating current Ix, by resistance sampling to produce sampled voltage Vx；
Reference voltage setup unit, for carrying out reference voltage Vs setting；
Compare output unit, for the sampled voltage Vx and the reference voltage Vs to be compared into amplification, and in work electricity
Stream Ix exports cut-off signals when exceeding setting electric current I；
Current limited Control unit, for controlling the grid of metal-oxide-semiconductor by the cut-off signals, so as to control the source electrode of metal-oxide-semiconductor with
Break-make between the drain electrode of metal-oxide-semiconductor, to reach current-limiting protection purpose.
A kind of 3. LED display screen system, it is characterised in that including with reset operational module host computer, send control card and
LED screen main body, the LED screen main body include the LED box of some matrix arrangements, and each LED box includes some receptions
The LED module of card and some matrix arrangements, each LED module includes power management module and current-limiting protection module, described
Some reception cards of the host computer through the transmission control card and each LED box realize the electricity with each LED module
Property connection so that the power management module of each LED module it is described reset operational module remote control under to corresponding
The LED module carry out electrification reset action.
4. a kind of LED display screen system according to claim 3, it is characterised in that the current-limiting protection module includes：
Sampled voltage generation unit, after detecting operating current Ix, by resistance sampling to produce sampled voltage Vx；
Reference voltage setup unit, for carrying out reference voltage Vs setting；
Compare output unit, for the sampled voltage Vx and the reference voltage Vs to be compared into amplification, and in work electricity
Stream Ix exports cut-off signals when exceeding setting electric current I；
Current limited Control unit, for controlling the grid of metal-oxide-semiconductor by the cut-off signals, so as to control the source electrode of metal-oxide-semiconductor with
Break-make between the drain electrode of metal-oxide-semiconductor, to reach current-limiting protection purpose.
5. a kind of LED display screen system according to claim 4, it is characterised in that the reference voltage setup unit is
The voltage regulator circuit formed based on chip LM431, the relatively output unit are the amplifier electricity formed based on chip LM2904
Road, the Current limited Control unit are the metal-oxide-semiconductor on-off circuit formed based on chip MT8103.
6. a kind of LED display screen system according to claim 3, it is characterised in that the power management module includes：
Reset signal inputs amplifying unit, and the power-on reset signal for the reset operational module to be sended over is isolated
Amplification；
Resetting voltage output unit, for making the LED by isolating the power-on reset signal triggering after amplifying to acquire
Module carries out the resetting voltage of electrification reset.
7. a kind of LED display screen system according to claim 6, it is characterised in that the reset signal input amplification is single
Member is the two-stage amplifying circuit formed based on two triodes.
8. a kind of LED display screen system according to claim 6, it is characterised in that the resetting voltage output unit is
The DC-DC change-over circuits formed based on chip AOZ1016, EN pins and the reset signal of the chip AOZ1016 are inputted
Amplifying unit is electrically connected with.
9. a kind of LED display screen system according to claim 6, it is characterised in that the resetting voltage output unit is
Metal-oxide-semiconductor on-off circuit.
10. according to a kind of any described LED display screen systems of claim 3-9, it is characterised in that the host computer with it is described
Remote network communication connection or the communication connection of medium or short range data are carried out between transmission control card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720475301.9U CN206893223U (en) | 2017-05-02 | 2017-05-02 | Led display screen system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720475301.9U CN206893223U (en) | 2017-05-02 | 2017-05-02 | Led display screen system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206893223U true CN206893223U (en) | 2018-01-16 |
Family
ID=61341367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720475301.9U Expired - Fee Related CN206893223U (en) | 2017-05-02 | 2017-05-02 | Led display screen system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206893223U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106952585A (en) * | 2017-05-02 | 2017-07-14 | 深圳市洲明科技股份有限公司 | Led display screen system |
| CN110599949A (en) * | 2019-09-20 | 2019-12-20 | 深圳市洲明科技股份有限公司 | LED box body and system card and display module thereof |
-
2017
- 2017-05-02 CN CN201720475301.9U patent/CN206893223U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106952585A (en) * | 2017-05-02 | 2017-07-14 | 深圳市洲明科技股份有限公司 | Led display screen system |
| CN106952585B (en) * | 2017-05-02 | 2023-08-22 | 深圳市洲明科技股份有限公司 | LED display screen system |
| CN110599949A (en) * | 2019-09-20 | 2019-12-20 | 深圳市洲明科技股份有限公司 | LED box body and system card and display module thereof |
| CN110599949B (en) * | 2019-09-20 | 2021-11-26 | 深圳市洲明科技股份有限公司 | LED box body and system card and display module thereof |
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