CN110890047A - Display device - Google Patents

Display device Download PDF

Info

Publication number
CN110890047A
CN110890047A CN201911116515.7A CN201911116515A CN110890047A CN 110890047 A CN110890047 A CN 110890047A CN 201911116515 A CN201911116515 A CN 201911116515A CN 110890047 A CN110890047 A CN 110890047A
Authority
CN
China
Prior art keywords
resistor
module
display device
electrically connected
board
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
CN201911116515.7A
Other languages
Chinese (zh)
Other versions
CN110890047B (en
Inventor
李继龙
王月
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.)
TCL Huaxing Photoelectric Technology Co Ltd
Original Assignee
TCL Huaxing Photoelectric 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 TCL Huaxing Photoelectric Technology Co Ltd filed Critical TCL Huaxing Photoelectric Technology Co Ltd
Priority to CN201911116515.7A priority Critical patent/CN110890047B/en
Publication of CN110890047A publication Critical patent/CN110890047A/en
Application granted granted Critical
Publication of CN110890047B publication Critical patent/CN110890047B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control 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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0067—Devices for protecting against damage from electrostatic discharge

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides a display device, which comprises a core plate, a control plate and a signal transmission module, wherein the core plate is provided with a plurality of through holes; the core board is used for transmitting a clock signal and a data signal to the control board; the control board is used for receiving a clock signal and a data signal from the core board; the signal transmission module is used for connecting the core board and the control board to realize signal transmission between the core board and the control board; the signal transmission module comprises a connecting circuit electrically connected with the core board and the control board, and an electrostatic protection module connected in series on the connecting circuit, wherein the electrostatic protection module is used for performing electrostatic protection on the connecting circuit. When signal transmission is carried out between the core board and the control board through the signal transmission module, the electrostatic protection module is utilized to carry out electrostatic protection on the connecting circuit, the antistatic capacity of the connecting circuit is enhanced, and therefore the core board and the control board are prevented from generating abnormity due to large electrostatic current.

Description

Display device
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
In recent years, as the demand for display of high-quality pictures by display devices increases, the demand for signal transmission interfaces of display devices has also become higher. Therefore, v-by-one (vbo) becomes a signal transmission interface standard suitable for flat panel displays, and has the advantages of high transmission quality, high transmission speed, cost saving, installation space saving and the like.
In a display device, a core board is a main board on which a main chip for processing a video signal such as video signal decoding, image scaling, color processing, output format conversion, and the like, and other chips for audio signal processing and the like are generally disposed. The core board of the display device is electrically connected to a control board (e.g., a TCON board), the control board is electrically connected to a data driving circuit (e.g., a COF), and the data driving circuit is connected to a display region of the display panel. The core board transmits the video signal to the control board, and the control board converts the input video signal into a data signal for the digital driving circuit and transmits the data signal to the data driving circuit.
A VBO signal transmission mechanism is adopted in signal transmission of the core board and the control board, 2 control pins, namely HTPDN and LOCKN, are used in the VBO signal transmission, when the machine core board is powered on the control board, the HTPDN pin is in a high level when the control board is initialized, the HTPDN is changed from the high level to a low level by the control board after initialization is completed, then the LOCKN pin is in the high level until CDR tracing (clock data recovery) is completed, and the control board pulls down the level signal of the LOCKN pin; after the byte alignment is sent by the core board, the data transmission is started.
The connecting circuit between the control panel and the mechanical panel in the existing design has poor antistatic capability, and if the electrostatic current is large, the core panel and the control panel in the display device are easy to be abnormal.
Disclosure of Invention
The invention provides a display device, which aims to solve the technical problems that a connecting circuit for connecting a screen body and a core board is poor in antistatic capability, and if the electrostatic current is large, the core board and the screen body TCON in the display device are easy to generate abnormity.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
a display device, comprising:
the chip board is provided with a hot plug pin and a clock locking pin and is used for transmitting a clock signal and a data signal to the control board;
a control board having a first control pin and a second control pin for receiving a clock signal and a data signal from the core board;
and the electrostatic protection module is used for performing electrostatic protection on a connecting circuit between the core board and the control board.
Furthermore, the connecting circuit comprises a first connecting line and a second connecting line, one end of the first connecting line is electrically connected with the first control pin, and the other end of the first connecting line is electrically connected with the hot-plug pin; one end of the second connecting wire is electrically connected with the second control pin, and the other end of the second connecting wire is electrically connected with the clock locking pin.
Furthermore, the electrostatic protection module comprises a first electrostatic protection module and a second electrostatic protection module, the first electrostatic protection module is connected with the first connecting line in series, and the second electrostatic protection module is connected with the second connecting line in series.
Further, the first electrostatic protection module comprises a first resistor, and the first resistor is connected in series with the first connection line.
Further, the second esd protection module includes a second resistor, and the second resistor is connected in series to the second connection line.
Furthermore, the resistance values of the first resistor and the second resistor are both 750-1200 ohms.
Furthermore, the display device further comprises a voltage pull-up module, the voltage pull-up module is connected with the power supply, the voltage pull-up module is connected with the first connecting line at a first node, and the voltage pull-up module is connected with the second connecting line at a second node and used for adjusting the potentials of the first node and the second node according to the communication state between the core board and the control board.
Further, the first control pin is connected to the first node, and the second control pin is connected to the second node.
Further, the voltage pull-up module comprises a third resistor and a fourth resistor; one end of the third resistor is electrically connected with the power supply, and the other end of the third resistor is electrically connected with the first node; one end of the fourth resistor is electrically connected with the power supply, and the other end of the fourth resistor is electrically connected with the second node.
Furthermore, the resistance values of the third resistor and the fourth resistor are both 8000-12000 ohms.
The invention has the beneficial effects that: the first resistor and the second resistor with proper resistance values are selected to be connected in series on the connecting circuit, the second resistor is arranged between the second node and the clock locking pin, the first resistor and the second resistor can play a good electrostatic protection effect, the phenomenon that the core board and the control board are abnormal due to overlarge electrostatic current is prevented, and meanwhile, when the potential of the clock locking pin is pulled down by the control board, the current generated by power voltage and passing through the clock locking pin is reduced by utilizing the voltage drop of the second resistor, so that the potential of the clock locking pin is reduced, the phenomenon that the core board mistakenly detects whether the potential of the clock locking pin is in a high potential state or not to cause signal unlocking can be prevented, and the compatibility of the connecting circuit is enhanced.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a functional block diagram of a display device according to the present invention;
fig. 2 is a schematic circuit diagram of a signal transmission module and a voltage pull-up module according to the present invention.
10. A core board; 20. a control panel; 30. a signal transmission module; 31. a connection circuit; 311. a first connecting line; 312. a second connecting line; 32. an electrostatic protection module; 40. a voltage pull-up module.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals.
The invention aims at the technical problems that in the existing display device, the antistatic capability of a connecting circuit for connecting a screen body and a core board is poor, and if the electrostatic current is large, the core board and the screen body TCON in the display device are easy to generate abnormity. The present invention can solve the above problems.
A display device, as shown in FIG. 1, includes a core board 10, a control board 20, a signal transmission module 30 and a voltage pull-up module 40.
The core board 10 has a hot-plug pin HTPDN and a clock lock pin LOCKN for transmitting a clock signal and a data signal to the control board 20.
Wherein the control board 20 has a first control pin T1 and a second control pin T2 for receiving a clock signal and a data signal from the core board 10.
The signal transmission module 30 is configured to connect the core board 10 and the control board 20, so as to realize signal transmission between the core board 10 and the control board 20.
The voltage pull-up module 40 is configured to adjust a voltage input to the signal transmission module 30 according to a communication state between the core board 10 and the control board 20.
Specifically, the signal transmission module 30 includes a connection circuit 31 electrically connected to the core board 10 and the control board 20, and an electrostatic protection module 32 connected in series to the connection circuit 31, where the electrostatic protection module 32 is configured to perform electrostatic protection on the connection circuit 31.
When the signal transmission module 30 transmits signals between the core board 10 and the control board 20, the electrostatic protection module 32 is used to perform electrostatic protection on the connection circuit 31, so as to enhance the antistatic capability of the connection circuit 31, thereby preventing the core board 10 and the control board 20 from generating abnormity due to large electrostatic current.
Specifically, as shown in fig. 2, the connection circuit 31 includes a first connection line 311 and a second connection line 312, one end of the first connection line 311 is electrically connected to the first control pin T1, and the other end is electrically connected to the hot-plug pin HTPDN; one end of the second connection line 312 is electrically connected to the second control pin T2, and the other end is electrically connected to the clock lock pin LOCKN.
Specifically, the esd protection module 32 includes a first esd protection module and a second esd protection module, the first esd protection module is connected in series with the first connection line 311, and the second esd protection module is connected in series with the second connection line 312.
Further, the first esd protection module includes a first resistor R1, and the first resistor R1 is connected in series to the first connection line 311.
Further, the second esd protection module comprises a second resistor R2, and the second resistor R2 is connected in series to the second connection line 312.
Specifically, the voltage pull-up module 40 is connected to a power supply, and the power supply provides a power supply voltage VDD for the voltage pull-up module 40; the voltage pull-up module 40 and the first connection line 311 are connected to a first node K1, and the voltage pull-up module 40 and the second connection line 312 are connected to a second node K2.
The voltage pull-up module 40 is configured to adjust the potentials of the first node K1 and the second node K2 according to the communication state between the core board 10 and the control board 20, so as to pull up the potential of the signal transmitted between the core board 10 and the control board 20, enhance the signal anti-interference capability, and improve the signal response time.
Specifically, the voltage pull-up module 40 includes a third resistor R3 and a fourth resistor R4; one end of the third resistor R3 is electrically connected to the power supply, and the other end is electrically connected to the first node K1; one end of the fourth resistor R4 is electrically connected to the power source, and the other end is electrically connected to the second node K2.
Further, the first control pin T1 is electrically connected to the first node K1, and the second control pin T2 is electrically connected to the second node K2; one end of the first resistor R1 is electrically connected to a first node K1, and the other end is electrically connected to the hot-plug pin HTPDN; one end of the second resistor R2 is electrically connected to the second node K2, and the other end is electrically connected to and electrically connected to the clock lock pin LOCKN.
It should be noted that, after the core board 10 is powered on, when the control board 20 in the display device is initialized, the potentials of the hot-plug pin HTPDN and the clock lock pin LOCKN are both high, after the initialization of the control board 20 is completed, the control board 20 pulls down the potential of the hot-plug pin HTPDN to a low potential, the core board 10 may transmit a clock signal to the control board 20 according to a fixed frequency, the control board 20 receives the clock signal and locks the transmission frequency of the data transmitted by the core board 10 based on the clock signal, then, after the control board 20 locks the transmission frequency of the data transmitted by the core board 10, the control board 20 may send a lock signal to the core board 10 to inform that the transmission frequency of the data is locked, the control board 20 pulls down the potential of the clock lock pin LOCKN, and the core board 10 may transmit the data signal to the control board 20 according to the fixed frequency.
Through setting up second resistance R2 between second node K2 and clock lock pin LOCKN, when clock lock pin LOCKN's electric potential was pulled low by control panel 20, utilize the voltage drop of second resistance R2, the electric current that passes through clock lock pin LOCKN that reduces mains voltage VDD and produce, thereby reduce clock lock pin LOCKN's electric potential, first resistance R1 and second resistance R2 play the electrostatic protection effect, can prevent that the machine core board 10 from missense clock lock pin LOCKN's electric potential or high potential state from leading to the signal to lose the lock simultaneously, strengthen connecting circuit 31's compatibility.
Furthermore, the resistance values of the first resistor R1 and the second resistor R2 are both 750-1200 ohms.
In one embodiment, the first resistor R1 and the second resistor R2 each have a resistance of 1000 ohms.
It should be noted that, in practical implementation, a detection instrument is used to perform an electrostatic protection capability test on the connection circuit 31 under the condition of serially connecting resistors with different resistance values, and it is known that when the resistance value of the resistor is 22 ohms or 100 ohms, the electrostatic protection capability fails when the voltage at two ends of the resistor reaches 7 kilovolts; when the resistance value of the resistor is 750 ohms, the electrostatic protection capability fails when the voltage at the two ends of the resistor reaches 10 kilovolts; when the resistance value of the resistor is 1000 ohms, the electrostatic protection capability fails when the voltage at the two ends of the resistor reaches 11 kilovolts.
As can be seen from the above detection data, the resistor with an appropriate resistance value can satisfy the electrostatic protection capability of the connection circuit 31, prevent the core board 10 and the control board 20 from generating an abnormality due to an excessive electrostatic current passing through the connection circuit 31, and prevent signal distortion.
Specifically, the voltage pull-up module 40 includes a third resistor R3 and a fourth resistor R4; one end of the third resistor R3 is electrically connected to the power supply, and the other end is electrically connected to the first node K1; one end of the fourth resistor R4 is electrically connected to the power source, and the other end is electrically connected to the second node K2.
The third resistor R3 and the fourth resistor R4 are both 8000-12000 ohms.
In one embodiment, the resistances of the third resistor R3 and the fourth resistor R4 are both 10000 ohms.
The invention has the beneficial effects that: the first resistor R1 and the second resistor R2 with proper resistance values are selected to be connected in series on the connecting circuit 31, meanwhile, the second resistor R2 is arranged between the second node K2 and the clock locking pin LOCKN, the first resistor R1 and the second resistor R2 can play a good electrostatic protection role, the phenomenon that the chip board 10 and the control board 20 are abnormal due to overlarge electrostatic current is prevented, meanwhile, when the potential of the clock locking pin LOCKN is pulled down by the control board 20, the current generated by the power voltage VDD and passing through the clock locking pin KN is reduced by means of the voltage drop of the second resistor R2, the potential of the clock locking pin LOCKN is reduced, the situation that the chip board 10 mistakenly detects whether the potential of the clock locking pin LOCKN is in a high potential state or a signal unlocking state is prevented, and the compatibility of the connecting circuit 31 is enhanced.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims (10)

1. A display device, characterized in that the display device comprises: the system comprises a machine core plate, a control plate and an electrostatic protection module which is electrically connected with the machine core plate and the control plate;
the chip board is provided with a hot plug pin and a clock locking pin and is used for transmitting a clock signal and a data signal to the control board;
a control board having a first control pin and a second control pin for receiving a clock signal and a data signal from the core board;
and the electrostatic protection module is used for performing electrostatic protection on a connecting circuit between the core board and the control board.
2. The display device according to claim 1, wherein the connection circuit comprises a first connection line and a second connection line, one end of the first connection line is electrically connected to the first control pin, and the other end of the first connection line is electrically connected to the hot-plug pin; one end of the second connecting wire is electrically connected with the second control pin, and the other end of the second connecting wire is electrically connected with the clock locking pin.
3. The display device according to claim 2, wherein the ESD protection module comprises a first ESD protection module and a second ESD protection module, the first ESD protection module is connected in series with the first connection line, and the second ESD protection module is connected in series with the second connection line.
4. The display device according to claim 3, wherein the first ESD module comprises a first resistor connected in series to the first connection line.
5. The display device according to claim 4, wherein the second ESD module comprises a second resistor connected in series to the second connection line.
6. The display device according to claim 5, wherein the first resistor and the second resistor each have a resistance of 750 to 1200 ohms.
7. The display device according to claim 1, further comprising a voltage pull-up module, wherein the voltage pull-up module is connected to a power supply, the voltage pull-up module is connected to a first node along with the first connection line, and the voltage pull-up module is connected to a second node along with the second connection line, and is configured to adjust potentials of the first node and the second node according to a communication state between the core board and the control board.
8. The display device according to claim 7, wherein the first control pin is connected to the first node, and the second control pin is connected to the second node.
9. The display device according to claim 7, wherein the voltage pull-up module comprises a third resistor and a fourth resistor; one end of the third resistor is electrically connected with the power supply, and the other end of the third resistor is electrically connected with the first node; one end of the fourth resistor is electrically connected with the power supply, and the other end of the fourth resistor is electrically connected with the second node.
10. The display device according to claim 9, wherein the third resistor and the fourth resistor each have a resistance of 8000 to 12000 ohms.
CN201911116515.7A 2019-11-15 2019-11-15 Display device Active CN110890047B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911116515.7A CN110890047B (en) 2019-11-15 2019-11-15 Display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911116515.7A CN110890047B (en) 2019-11-15 2019-11-15 Display device

Publications (2)

Publication Number Publication Date
CN110890047A true CN110890047A (en) 2020-03-17
CN110890047B CN110890047B (en) 2022-09-27

Family

ID=69747581

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911116515.7A Active CN110890047B (en) 2019-11-15 2019-11-15 Display device

Country Status (1)

Country Link
CN (1) CN110890047B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201594206U (en) * 2010-01-08 2010-09-29 研祥智能科技股份有限公司 Industrial control main board and expansion board and industrial computer thereof
CN204721475U (en) * 2015-06-24 2015-10-21 广州视源电子科技股份有限公司 A kind of control circuit
CN105118412A (en) * 2015-09-29 2015-12-02 京东方科技集团股份有限公司 DVI (digital visual interface) signal conversion apparatus and DVI signal input test board
CN106454184A (en) * 2016-12-08 2017-02-22 合肥惠科金扬科技有限公司 DVI (Digital Visual Interface) interface circuit and television
CN206596112U (en) * 2016-12-08 2017-10-27 合肥惠科金扬科技有限公司 A kind of DVI interface circuit and television set

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201594206U (en) * 2010-01-08 2010-09-29 研祥智能科技股份有限公司 Industrial control main board and expansion board and industrial computer thereof
CN204721475U (en) * 2015-06-24 2015-10-21 广州视源电子科技股份有限公司 A kind of control circuit
CN105118412A (en) * 2015-09-29 2015-12-02 京东方科技集团股份有限公司 DVI (digital visual interface) signal conversion apparatus and DVI signal input test board
CN106454184A (en) * 2016-12-08 2017-02-22 合肥惠科金扬科技有限公司 DVI (Digital Visual Interface) interface circuit and television
CN206596112U (en) * 2016-12-08 2017-10-27 合肥惠科金扬科技有限公司 A kind of DVI interface circuit and television set

Also Published As

Publication number Publication date
CN110890047B (en) 2022-09-27

Similar Documents

Publication Publication Date Title
CN202797544U (en) Active cable, cable assembly and electronic device
US9936154B2 (en) Digital video and data transmission
US8151018B2 (en) Dual-mode data transfer of uncompressed multimedia contents or data communications
TW469669B (en) Transmitting system having a connector
CN102204156A (en) Independent link(s) over differential pairs using common-mode signaling
US20240040188A1 (en) Cable, method of controlling cable, connection device, electronic device, and method of controlling electronic device
CN103700319A (en) Spliced display device
US9083175B2 (en) Protection circuit
CN110890047B (en) Display device
CN107045861A (en) Differential signaling circuit and display device
JP6995557B2 (en) Relay device, receiver device, and transmission system using them
US8456456B2 (en) Dongle
CN108024129A (en) Display device and its mainboard
CN104636096A (en) Graphic card and electronic device
CN214315441U (en) LVDS-CML level conversion circuit and equipment
US11792361B2 (en) Redriver capable of switching between linear and limited modes
CN111565272B (en) Device and method for long-distance transmission of camera data through parallel bus
WO2021223460A1 (en) Machine core main board and display device
US11176074B2 (en) Chip and interface conversion device
CN111277769B (en) Switching device and image switching system and method thereof
JP4957302B2 (en) Differential transmission circuit
JP2007306267A (en) Semiconductor transmitting and receiving device system, memory card, and memory card host equipment
JP2001134241A (en) Liquid crystal display device
TWI450263B (en) Circuitry for active cable
US11275126B2 (en) Test system, transmitting device, and receiving device capable of performing multiple tests in AC coupling mode

Legal Events

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