CN105654912A - Screen backlight control circuit and display device - Google Patents

Screen backlight control circuit and display device Download PDF

Info

Publication number
CN105654912A
CN105654912A CN201610148951.2A CN201610148951A CN105654912A CN 105654912 A CN105654912 A CN 105654912A CN 201610148951 A CN201610148951 A CN 201610148951A CN 105654912 A CN105654912 A CN 105654912A
Authority
CN
China
Prior art keywords
screen
control circuit
display device
backlight
driving chip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201610148951.2A
Other languages
Chinese (zh)
Other versions
CN105654912B (en
Inventor
王智勇
王平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHONGQING HUIKE JINYANG TECHNOLOGY Co Ltd
Original Assignee
CHONGQING HUIKE JINYANG TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHONGQING HUIKE JINYANG TECHNOLOGY Co Ltd filed Critical CHONGQING HUIKE JINYANG TECHNOLOGY Co Ltd
Priority to CN201610148951.2A priority Critical patent/CN105654912B/en
Publication of CN105654912A publication Critical patent/CN105654912A/en
Application granted granted Critical
Publication of CN105654912B publication Critical patent/CN105654912B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406Control of illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/027Arrangements or methods related to powering off a display

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electronic Switches (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention discloses a screen backlight control circuit and a display device. The circuit comprises an infrared emitting end arranged on the front side of a screen of the display device and used for emitting infrared rays, an infrared receiving end arranged on the front side of the screen and used for receiving the infrared rays reflected back by an object in front of the screen and outputting a driving signal, and a control circuit used for receiving the driving signal and controlling a backlight line of the screen to work to lighten a light bar of the screen. Disconnection of the backlight circuit of a power supply in a complete set is controlled in an infrared ray induction mode, a load is automatically switched on by detecting the change of an infrared spectrum of the human body, the load is continuously switched on when a user does not leave an induction range, the backlight line is disconnected after the user leaves, and thus the problem that a screen of a display device can not be automatically switched off in an idle state, and consequently energy is wasted is solved.

Description

A kind of screen backlight control circuit and display device
Technical field
The present invention relates to field of display, particularly relate to a kind of screen backlight control circuit and display device.
Background technology
Current liquid crystal display or the main power consuming portions of LCD TV complete machine is exactly screen lamp bar, namely put the circuit of bright light bar be electrically in backlight drive circuit. When before user frames out, typically not actively closing screen, the backlight of screen is still lighted, and can produce bigger waste, not meet the requirement of environmental protection and energy saving.
Summary of the invention
Present invention aim at providing a kind of screen backlight control circuit, it is intended to the screen of solution display device will not actively be closed time idle, the problem causing energy waste.
The invention provides a kind of screen backlight control circuit, including:
Infrared emission end, is arranged at the front of the screen of display device, is used for launching infrared ray;
Infrared receiver end, is arranged at the front of described screen, for the described infrared ray that the object received before described screen is reflected back, and output drive signal;
Control circuit, receives described driving signal and controls the backlight line work of described screen, light the lamp bar of described screen.
Preferably, described infrared emission end is arranged at the frame in described screen front.
Preferably, described infrared receiver end is arranged at the frame in described screen front.
Preferably, described infrared receiver end included filter and CCD-detector, and described filter excessively is arranged at the surface of the frame in described screen front, and described CCD-detector is arranged in described frame and described mistake filter is relative, and is connected with described control circuit.
Preferably, described control circuit includes a photoelectrical coupler, a voltage regulation unit and a driving chip, wherein:
The luminous source input of described photoelectrical coupler and the outfan of described CCD-detector, receive described driving signal, the luminous source outfan of described photoelectrical coupler passes through the first resistance eutral grounding, the input of the light-receiving device of described photoelectrical coupler terminates a control level signal, the outfan of the light-receiving device of described photoelectrical coupler passes through the second resistance eutral grounding, and the first input end of described driving chip is connect by the 3rd resistance, second input termination pwm signal of described driving chip, described driving chip and described backlight connection;
The described first input end stating driving chip and the second input are by described voltage regulation unit ground connection.
Present invention also offers a kind of display device, including screen and screen backlight control circuit, described screen backlight control circuit includes:
Infrared emission end, is arranged at the front of the screen of display device, is used for launching infrared ray;
Infrared receiver end, is arranged at the front of described screen, for the described infrared ray that the object received before described screen is reflected back, and output drive signal;
Control circuit, receives described driving signal and controls the backlight line work of described screen, light the lamp bar of described screen.
Preferably, described infrared emission end is arranged at the frame in described screen front.
Preferably, described infrared receiver end is arranged at the frame in described screen front.
Preferably, described infrared receiver end included filter and CCD-detector, and described filter excessively is arranged at the surface of the frame in described screen front, and described CCD-detector is arranged in described frame and described mistake filter is relative, and is connected with described control circuit.
Preferably, described control circuit includes a photoelectrical coupler, a voltage regulation unit and a driving chip, wherein:
The luminous source input of described photoelectrical coupler and the outfan of described CCD-detector, receive described driving signal, the luminous source outfan of described photoelectrical coupler passes through the first resistance eutral grounding, the input of the light-receiving device of described photoelectrical coupler terminates a control level signal, the outfan of the light-receiving device of described photoelectrical coupler passes through the second resistance eutral grounding, and the first input end of described driving chip is connect by the 3rd resistance, second input termination pwm signal of described driving chip, described driving chip and described backlight connection;
The described first input end stating driving chip and the second input are by described voltage regulation unit ground connection.
Above-mentioned screen backlight control circuit and display device can by controlling the shutoff of the backlight circuit of power supply in complete machine by infrared induction mode, by detecting the change of the infrared spectrum of human body, turn on automatically load, user is without departing from induction range, to be continuously turned on, after people leaves, turn off backlight circuit, solve the screen of display device idle time will not actively close, the problem causing energy waste.
Accompanying drawing explanation
Fig. 1 is screen backlight control circuit module diagram in present pre-ferred embodiments;
Fig. 2 is the screen construction schematic diagram of display device in present pre-ferred embodiments;
Fig. 3 is that screen backlight control circuit middle infrared (Mid-IR) shown in Fig. 1 is launched and receives the structural representation of parts;
Fig. 4 is the circuit theory diagrams of control circuit in screen backlight control circuit shown in Fig. 1.
Detailed description of the invention
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, Fig. 2 and Fig. 3, in present pre-ferred embodiments, screen backlight control circuit includes infrared emission end 11, infrared receiver end 12 and control circuit 13.
Infrared emission end 11 is arranged at the front of the screen 20 of display device, is used for launching infrared ray 112; Infrared receiver end 12 is arranged at the front of described screen 20, for receiving the described infrared ray 112 that the object 30 before described screen 20 is reflected back, and output drive signal (with reference to Fig. 3); Control circuit 13 receives the backlight circuit 21 of the described driving signal described screen 20 of control and works, and lights the lamp bar of described screen 20.
Preferably, referring to Fig. 2 and Fig. 3, described infrared emission end 11 is arranged at the frame 22 in described screen 20 front. Described infrared receiver end 12 is arranged at the frame 22 in described screen 20 front. Specifically, infrared emission end 11 and infrared receiver end 12 towards with screen 20 towards identical.
Preferably, described infrared receiver end 12 included filter 122 and CCD-detector 124, described filter 122 excessively is arranged at the surface of the frame 22 in described screen 20 front, and described CCD-detector 124 is arranged in described frame 22 and described mistake filter 122 is relative, and is connected with described control circuit 13.
Preferably, referring to Fig. 4, described control circuit 13 includes photoelectrical coupler 131, voltage regulation unit 132 and a driving chip 133.
The outfan of the luminous source input of described photoelectrical coupler 131 and described CCD-detector 124, receive described driving signal, the luminous source outfan of described photoelectrical coupler 131 passes through the first resistance R1 ground connection, the input of the light-receiving device of described photoelectrical coupler 131 terminates a control level signal PSON, the outfan of the light-receiving device of described photoelectrical coupler 131 passes through the second resistance R2 ground connection, and the first input end of described driving chip 133 is connect by the 3rd resistance R3, second input termination pwm signal of described driving chip 133, described driving chip 133 is connected with described backlight circuit 21, the described first input end stating driving chip 133 and the second input are by described voltage regulation unit 132 ground connection.
When object is in region of ultra-red, the transmitting light of infrared emitting end 11 detects object, then reflection light is transmitted in CCD-detector 124 (integrated circuit processor) by filter 122, signal is after treatment, launch a signal to control circuit 13 receiving terminal, receiving terminal is received order and is given to a foot of optocoupler 131 by amplification treatment circuit one voltage of output, 1.2 foot induction of signal of optocoupler 131 are to optocoupler 3.4 foot, turn it on, optocoupler 3 foot is to connect control level signal PSON signal (high level), after conducting, high level voltage flows to optocoupler 4 foot first input end by the first resistance R1 to driving chip 133, because receiving pwm signal before the second input termination pwm signal of driving chip 133 always, also it is being high level plus present first input end, backlight circuit 21 is started working, point bright light bar, namely backlight is bright, otherwise backlight is extinguished.
In the present embodiment, driving chip 133 can be constant-current driven chip, and first input end can be trigger end, and when receiving the triggering signal of high level, driving chip 133 drives backlight circuit 21 to work.
Above-mentioned screen backlight control circuit can by controlling the shutoff of the backlight circuit of power supply in complete machine by infrared induction mode, by detecting the change of the infrared spectrum of human body, turn on automatically load, user is without departing from induction range, to be continuously turned on, after people leaves, turn off backlight circuit, solve the screen of display device idle time will not actively close, the problem causing energy waste.
Additionally, refer to Fig. 1-4, also disclosing a kind of display device and include screen 20 and screen 20 backlight control circuit 13, described screen 20 backlight control circuit 13 includes:
Infrared emission end 11, is arranged at the front of the screen 20 of display device, is used for launching infrared ray 112;
Infrared receiver end 12, is arranged at the front of described screen 20, for receiving the described infrared ray 112 that the object before described screen 20 is reflected back output drive signal;
Control circuit 13, the backlight circuit 21 receiving the described driving signal described screen 20 of control works, and lights the lamp bar of described screen 20.
Preferably, described infrared emission end 11 is arranged at the frame 22 in described screen 20 front.
Preferably, described infrared receiver end 12 is arranged at the frame 22 in described screen 20 front.
Preferably, described infrared receiver end 12 included filter 122 and CCD-detector 124, described filter 122 excessively is arranged at the surface of the frame 22 in described screen 20 front, and described CCD-detector 124 is arranged in described frame 22 and described mistake filter 122 is relative, and is connected with described control circuit 13.
Preferably, described control circuit 13 includes photoelectrical coupler 131, voltage regulation unit 132 and a driving chip 133.
The outfan of the luminous source input of described photoelectrical coupler 131 and described CCD-detector 124, receive described driving signal, the luminous source outfan of described photoelectrical coupler 131 passes through the first resistance R1 ground connection, the input of the light-receiving device of described photoelectrical coupler 131 terminates a control level signal PSON, the outfan of the light-receiving device of described photoelectrical coupler 131 passes through the second resistance R2 ground connection, and the first input end of described driving chip 133 is connect by the 3rd resistance R3, second input termination pwm signal of described driving chip 133, described driving chip 133 is connected with described backlight circuit 21, the described first input end stating driving chip 133 and the second input are by described voltage regulation unit 132 ground connection.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.

Claims (10)

1. a screen backlight control circuit, it is characterised in that including:
Infrared emission end, is arranged at the front of the screen of display device, is used for launching infrared ray;
Infrared receiver end, is arranged at the front of described screen, for the described infrared ray that the object received before described screen is reflected back, and output drive signal;
Control circuit, receives described driving signal and controls the backlight line work of described screen, light the lamp bar of described screen.
2. screen backlight control circuit as claimed in claim 1, it is characterised in that described infrared emission end is arranged at the frame in described screen front.
3. screen backlight control circuit as claimed in claim 1, it is characterised in that described infrared receiver end is arranged at the frame in described screen front.
4. screen backlight control circuit as claimed in claim 3, it is characterized in that, described infrared receiver end included filter and CCD-detector, described filter excessively is arranged at the surface of the frame in described screen front, described CCD-detector is arranged in described frame and described mistake filter is relative, and is connected with described control circuit.
5. screen backlight control circuit as claimed in claim 4, it is characterised in that described control circuit includes a photoelectrical coupler, a voltage regulation unit and a driving chip, wherein:
The luminous source input of described photoelectrical coupler and the outfan of described CCD-detector, receive described driving signal, the luminous source outfan of described photoelectrical coupler passes through the first resistance eutral grounding, the input of the light-receiving device of described photoelectrical coupler terminates a control level signal, the outfan of the light-receiving device of described photoelectrical coupler passes through the second resistance eutral grounding, and the first input end of described driving chip is connect by the 3rd resistance, second input termination pwm signal of described driving chip, described driving chip and described backlight connection;
The described first input end stating driving chip and the second input are by described voltage regulation unit ground connection.
6. a display device, including screen, it is characterised in that also including screen backlight control circuit, described screen backlight control circuit includes:
Infrared emission end, is arranged at the front of the screen of display device, is used for launching infrared ray;
Infrared receiver end, is arranged at the front of described screen, for the described infrared ray that the object received before described screen is reflected back, and output drive signal;
Control circuit, receives described driving signal and controls the backlight line work of described screen, light the lamp bar of described screen.
7. display device as claimed in claim 6, it is characterised in that described infrared emission end is arranged at the frame in described screen front.
8. display device as claimed in claim 6, it is characterised in that described infrared receiver end is arranged at the frame in described screen front.
9. display device as claimed in claim 8, it is characterized in that, described infrared receiver end included filter and CCD-detector, described filter excessively is arranged at the surface of the frame in described screen front, described CCD-detector is arranged in described frame and described mistake filter is relative, and is connected with described control circuit.
10. display device as claimed in claim 9, it is characterised in that described control circuit includes a photoelectrical coupler, a voltage regulation unit and a driving chip, wherein:
The luminous source input of described photoelectrical coupler and the outfan of described CCD-detector, receive described driving signal, the luminous source outfan of described photoelectrical coupler passes through the first resistance eutral grounding, the input of the light-receiving device of described photoelectrical coupler terminates a control level signal, the outfan of the light-receiving device of described photoelectrical coupler passes through the second resistance eutral grounding, and the first input end of described driving chip is connect by the 3rd resistance, second input termination pwm signal of described driving chip, described driving chip and described backlight connection;
The described first input end stating driving chip and the second input are by described voltage regulation unit ground connection.
CN201610148951.2A 2016-03-16 2016-03-16 A kind of screen backlight control circuit and display device Active CN105654912B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610148951.2A CN105654912B (en) 2016-03-16 2016-03-16 A kind of screen backlight control circuit and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610148951.2A CN105654912B (en) 2016-03-16 2016-03-16 A kind of screen backlight control circuit and display device

Publications (2)

Publication Number Publication Date
CN105654912A true CN105654912A (en) 2016-06-08
CN105654912B CN105654912B (en) 2019-02-26

Family

ID=56493796

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610148951.2A Active CN105654912B (en) 2016-03-16 2016-03-16 A kind of screen backlight control circuit and display device

Country Status (1)

Country Link
CN (1) CN105654912B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106371548A (en) * 2016-08-31 2017-02-01 深圳市创凯智能股份有限公司 Display screen energy saving control method and device
CN107507592A (en) * 2017-09-06 2017-12-22 京东方科技集团股份有限公司 Display device and its control method
CN107770466A (en) * 2017-11-06 2018-03-06 青岛海信激光显示股份有限公司 A kind of laser television
CN108766371A (en) * 2018-07-04 2018-11-06 惠州市德赛西威汽车电子股份有限公司 A kind of the intelligent backlight control system and its method of touch panel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101515195A (en) * 2009-03-09 2009-08-26 深圳华为通信技术有限公司 Method for controlling shutting of display device backlight and device thereof
CN102038470A (en) * 2009-10-09 2011-05-04 泰怡凯电器(苏州)有限公司 Automatic-moving ground treatment robot and ground-abutting treatment control method thereof
CN101930704B (en) * 2010-08-05 2012-07-04 宋四海 Information release terminal device with human body-sensing display
CN202549254U (en) * 2012-01-19 2012-11-21 苏州工业职业技术学院 Drive circuit for high-power LED (Light Emitting Diode) backlight source
CN205541826U (en) * 2016-03-16 2016-08-31 重庆惠科金扬科技有限公司 Screen back of body light controlling circuit and display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101515195A (en) * 2009-03-09 2009-08-26 深圳华为通信技术有限公司 Method for controlling shutting of display device backlight and device thereof
CN102038470A (en) * 2009-10-09 2011-05-04 泰怡凯电器(苏州)有限公司 Automatic-moving ground treatment robot and ground-abutting treatment control method thereof
CN101930704B (en) * 2010-08-05 2012-07-04 宋四海 Information release terminal device with human body-sensing display
CN202549254U (en) * 2012-01-19 2012-11-21 苏州工业职业技术学院 Drive circuit for high-power LED (Light Emitting Diode) backlight source
CN205541826U (en) * 2016-03-16 2016-08-31 重庆惠科金扬科技有限公司 Screen back of body light controlling circuit and display device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106371548A (en) * 2016-08-31 2017-02-01 深圳市创凯智能股份有限公司 Display screen energy saving control method and device
CN106371548B (en) * 2016-08-31 2019-03-05 深圳市创凯智能股份有限公司 Display screen energy-saving control method and device
CN107507592A (en) * 2017-09-06 2017-12-22 京东方科技集团股份有限公司 Display device and its control method
CN107507592B (en) * 2017-09-06 2020-01-07 京东方科技集团股份有限公司 Display device and control method thereof
CN107770466A (en) * 2017-11-06 2018-03-06 青岛海信激光显示股份有限公司 A kind of laser television
CN107770466B (en) * 2017-11-06 2019-12-17 青岛海信激光显示股份有限公司 Laser television
CN108766371A (en) * 2018-07-04 2018-11-06 惠州市德赛西威汽车电子股份有限公司 A kind of the intelligent backlight control system and its method of touch panel

Also Published As

Publication number Publication date
CN105654912B (en) 2019-02-26

Similar Documents

Publication Publication Date Title
CN105654912A (en) Screen backlight control circuit and display device
KR101494822B1 (en) Standby power cut-off apparatus
EP2547174A3 (en) Illumination light communication device, and illumination apparatus and system including same
NZ580402A (en) A power adaptor for a lighting unit having a solid-state light source and a controller for controlling power draw
CN104284115A (en) Quick starting method for liquid crystal television
CN205541826U (en) Screen back of body light controlling circuit and display device
TWM491315U (en) Moving object sensing lamp control system with multiple lighting functions
CN101770751A (en) System and method for regulating brightness of backlight module of liquid crystal display
CN104546287B (en) A kind of automatic shading electric welding mask mirror group
CN201926243U (en) Refrigerator illuminating system with adjustable light brightness
CN104168687A (en) Light emitting diode driving device and light emitting diode backlight system using same
CN103280192B (en) LED backlight drive circuit, liquid crystal indicator and a kind of driving method
TW201547325A (en) Controlling system and method of moving object detection light source to realize a variety of illuminations
CN205611001U (en) Linear constant current PWM optoelectronic isolation receiving terminal of high pressure
CN203223803U (en) Lamp for self adapting to environmental illumination
CN210202130U (en) Dimming mobile induction device compatible with LED driver
CN208691607U (en) A kind of energy saving indicating circuit of automatic vending machine
US10908435B2 (en) Automatically photosensitive sunglasses with low power consumption
CN105263243A (en) Lamp adaptive to environment illumination
CN202135370U (en) Circuit structure of anti-dazzle LED flash lamp
CN104930435A (en) Desk lamp with timing function
CN205751475U (en) A kind of brightness adjustable OLED drive circuit
CN206754870U (en) Medical electrical lighting equipment with an automatic light meter
CN216848514U (en) Powder leakage alarm control system
CN203724311U (en) Dual-outer-adjustment automatic darkening welding filter

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant