CN108597427B - Amplitude adjusting device and method for AUX output channel in DP interface - Google Patents
Amplitude adjusting device and method for AUX output channel in DP interface Download PDFInfo
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- CN108597427B CN108597427B CN201810251013.4A CN201810251013A CN108597427B CN 108597427 B CN108597427 B CN 108597427B CN 201810251013 A CN201810251013 A CN 201810251013A CN 108597427 B CN108597427 B CN 108597427B
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- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
Abstract
The invention discloses an AUX output channel amplitude adjusting device in a DP interface, which comprises an AUX positive input end voltage-dividing resistor connected between an AUX positive input end and an AUX positive output end, an AUX negative input end voltage-dividing resistor connected between an AUX negative input end and an AUX negative output end, an electronic switch chip and a plurality of switch chip voltage-dividing resistors, wherein the electronic switch chip is used for gating the corresponding switch chip voltage-dividing resistors to be connected between the AUX positive output end and the AUX negative output end under the control of various AUX amplitude parameter enabling signals. The invention realizes the adjustment of the amplitude of the AUX channel in the DP interface and improves the test efficiency of the display model.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to an amplitude adjusting device and method for an AUX output channel in a DP interface.
Background
The DP interface (DisplayPort) is an image display interface that can support not only full high-definition display resolution (1920 × 1080), but also 4k resolution (3840 × 2160), and the latest 8k resolution (7680 × 4320). The DP interface has high transmission rate, is reliable and stable, and the signals transmitted by the DP interface include data Channel signals for transmitting images, and auxiliary Channel signals for transmitting image-related status and control information, and specifically include a Main Channel (Main Link), an auxiliary Channel (AUX Channel) and a Link routing (Link routing) for DisplayPort data transmission.
The auxiliary Channel (AUX Channel) is used as an independent bidirectional transmission auxiliary Channel in the DP interface, adopts an alternating current coupling differential transmission mode, is a bidirectional half-duplex transmission Channel, has a single directional rate of only about 1Mbit/s, and is used for transmitting setting and control instructions.
Uses of aux (auxiliary) include reading Extended Display Identification Data (EDID) to ensure proper transmission of DP signals; reading information of a DP interface supported by a display, such as the number of main channels and the transmission rate of a DP signal; setting various display configuration registers; the display status register is read.
Therefore, the signals of the DP interface can be correctly transmitted only by ensuring that the signals of the AUX are correct, and the liquid crystal modules with different DP protocols have different requirements on the amplitude of the output signals of the AUX. At present, when the liquid crystal module detection equipment detects the liquid crystal module, various liquid crystal module testing devices with matched AUX output amplitudes need to be designed aiming at the liquid crystal modules with different DP protocols, and the testing cost of the liquid crystal module is obviously improved.
Disclosure of Invention
The invention aims to provide a device and a method for adjusting the amplitude of an AUX output channel in a DP interface, which can conveniently and quickly adjust the amplitude of the AUX output channel in the DP interface.
In order to achieve the purpose, the amplitude adjusting device for the AUX output channel in the DP interface comprises an AUX positive input end voltage-dividing resistor connected between an AUX positive input end and an AUX positive output end, an AUX negative input end voltage-dividing resistor connected between an AUX negative input end and an AUX negative output end, an electronic switch chip and a plurality of switch chip voltage-dividing resistors, wherein the electronic switch chip is used for gating the corresponding switch chip voltage-dividing resistors to be connected between the AUX positive output end and the AUX negative output end under the control of various AUX amplitude parameter enabling signals.
An amplitude adjusting method for an AUX output channel in a DP interface of the device comprises the following steps:
step 1: when the AUX sends data, the electronic switch chip receives an AUX amplitude parameter enabling signal;
step 2: the electronic switch chip gates a corresponding switch chip voltage dividing resistor to be connected between the AUX positive output end and the AUX negative output end under the control of the AUX amplitude parameter enabling signal;
and step 3: and the voltage dividing resistor of the AUX positive input end, the voltage dividing resistor of the AUX negative input end and the voltage dividing resistor of the switch chip between the AUX input end and the AUX output end form corresponding resistor voltage dividing values to adjust the amplitude of the AUX receiving signal.
The invention has the beneficial effects that:
according to the invention, the AUX positive input end divider resistor, the AUX negative input end divider resistor, the electronic switch chip and the plurality of switch chip divider resistors are arranged, so that the corresponding resistor divider value is formed between the AUX input end and the AUX output end under the control of various AUX amplitude parameter enabling signals to realize amplitude adjustment of an AUX output channel.
Drawings
FIG. 1 is a block diagram of the present invention.
FIG. 2 shows a liquid crystal module testing apparatus using the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
because the importance of AUX channel data to a DP point screen, different DP protocols and different requirements of liquid crystal modules on the amplitude of AUX are met, and the signal quality of the AUX channel is a precondition of the DP point screen, the AUX output channel amplitude adjusting device in the DP interface comprises an AUX positive input end voltage-dividing resistor R1 connected between an AUX positive input end AUX _ P and an AUX positive output end AUX _ SRCP, an AUX negative input end voltage-dividing resistor R2 connected between an AUX negative input end AUX _ N and an AUX negative output end AUX _ SRCN, an electronic switch chip U1 and a plurality of switch chip voltage-dividing resistors, wherein the electronic switch chip U1 is used for gating the corresponding switch chip resistor to be connected between the AUX positive output end AUX _ SRCP and the AUX negative output end AUX _ SRCN under the control of various AUX amplitude parameter enabling signals, so that the corresponding switch chip resistor voltage-dividing value is generated between the X input end and the AUX output end to realize the adjustment of the AUX output channel.
In the above technical scheme, the resistances of the voltage dividing resistor R1 at the AUX positive input end and the voltage dividing resistor R2 at the AUX negative input end are equal to each other, so as to ensure that the AUX positive input signal and the AUX negative input signal change synchronously, and the output AUX signal meets the requirement. In this example, R1 ═ R2 ═ 49.9 Ω.
In the above technical solution, the switch a1 interface of the electronic switch chip U1 is connected to the AUX positive output terminal AUX _ SRCP through the switch chip voltage-dividing resistor R3, the switch B1 interface is connected to the AUX negative output terminal AUX _ SRCN, and the AUX amplitude parameter enable signal SW1 received by the electronic switch chip U1 is used to control the switch a1 interface of the electronic switch chip U1 to be connected to the switch B1 interface.
The switch A2 interface of the electronic switch chip U1 is connected with the AUX positive electrode output end AUX _ SRCP through a switch chip voltage dividing resistor R4, the switch B2 interface is connected with the AUX negative electrode output end AUX _ SRCN, and the AUX amplitude parameter enabling signal SW2 received by the electronic switch chip U1 is used for controlling the switch A2 interface of the electronic switch chip U1 to be connected with the switch B2 interface.
The switch A3 interface of the electronic switch chip U1 is connected with the AUX positive electrode output end AUX _ SRCP through a switch chip voltage dividing resistor R5, the switch B3 interface is connected with the AUX negative electrode output end AUX _ SRCN, and the AUX amplitude parameter enabling signal SW3 received by the electronic switch chip U1 is used for controlling the switch A3 interface of the electronic switch chip U1 to be connected with the switch B3 interface.
The switch A4 interface of the electronic switch chip U1 is connected with the AUX positive electrode output end AUX _ SRCP through a switch chip voltage dividing resistor R6, the switch B4 interface is connected with the AUX negative electrode output end AUX _ SRCN, and the AUX amplitude parameter enabling signal SW4 received by the electronic switch chip U1 is used for controlling the switch A4 interface of the electronic switch chip U1 to be connected with the switch B4 interface.
In the above technical solution, each logic control input interface of the electronic switch chip U1, which is used for receiving various AUX amplitude parameter enable signals, is grounded through a corresponding pull-down resistor. The logic control input interface IN1 of the electronic switch chip U1 is configured to receive the AUX amplitude parameter enable signal SW1, the logic control input interface IN2 of the electronic switch chip U1 is configured to receive the AUX amplitude parameter enable signal SW2, the logic control input interface IN3 of the electronic switch chip U1 is configured to receive the AUX amplitude parameter enable signal SW3, the logic control input interface IN4 of the electronic switch chip U1 is configured to receive the AUX amplitude parameter enable signal SW4, the logic control input interface IN1 of the electronic switch chip U1 is grounded through a pull-down resistor R7, the logic control input interface IN2 of the electronic switch chip U1 is grounded through a pull-down resistor R8, the logic control input interface IN3 of the electronic switch chip U1 is grounded through a pull-down resistor R9, and the logic control input interface IN4 of the electronic switch chip U1 is grounded through a pull-down resistor R10. IN this embodiment, the pull-down resistor is 4.7K Ω, and the purpose of the pull-down resistor is to make the default IO level of the logic control input interfaces IN1 to IN4 of the electronic switch chip U1 be a low level, so that the corresponding switch interfaces of the electronic switch chip U1 are IN an off state IN the initial state. Therefore, the corresponding switch chip divider resistor is gated to be connected between the AUX positive output end AUX _ SRCP and the AUX negative output end AUX _ SRCN under the control of the AUX amplitude parameter enabling signal.
In the above technical solution, the power supply terminal VCC of the electronic switch chip U1 is connected to the power supply, and the ground terminal GND of the electronic switch chip U1 is grounded.
In the above technical solution, various AUX amplitude parameter enable signals are configured by an FPGA (Field-Programmable Gate Array).
In the above technical solution, the AUX received signal amplitude between the AUX positive output terminal AUX _ SRCP and the AUX negative output terminal AUX _ SRCN is the amplitude of the AUX transmission signal × gated switch chip voltage dividing resistor/(AUX positive input terminal voltage dividing resistor R1+ AUX negative input terminal voltage dividing resistor R2+ gated switch chip voltage dividing resistor).
In this embodiment, when the AUX positive input terminal voltage-dividing resistor R1 is equal to 49.9 Ω of the AUX negative input terminal voltage-dividing resistor R2, the switch chip voltage-dividing resistor R3 is equal to 20 Ω of the switch chip, the switch chip voltage-dividing resistor R4 is equal to 30 Ω of the switch chip, the switch chip voltage-dividing resistor R5 is equal to 40.2 Ω of the switch chip, and the switch chip voltage-dividing resistor R6 is equal to 49.9 Ω of the switch chip, the adjustment multiple of the AUX reception signal is equal to 20 Ω/(49.9 Ω +49.9 Ω +20 Ω) of the switch chip voltage-dividing resistor R3 is 0.167; when the switch chip divider resistor R4 is gated, the adjustment multiple of the AUX received signal is 30 Ω/(49.9 Ω +49.9 Ω +30 Ω) ═ 0.231; when the switch chip divider resistor R5 is gated, the adjustment multiple of the AUX received signal is 40.2 Ω/(49.9 Ω +49.9 Ω +40.2 Ω) ═ 0.287; when the switch chip divider resistor R6 is gated, the adjustment multiple of the AUX received signal is 49.9 Ω/(49.9 Ω +49.9 Ω +49.9 Ω) 0.333;
an amplitude adjusting method for an AUX output channel in a DP interface of the device comprises the following steps:
step 1: when the AUX sends data, the electronic switch chip U1 receives an AUX amplitude parameter enabling signal;
step 2: the electronic switch chip U1 gates the corresponding switch chip voltage dividing resistor to be connected between the AUX positive output end AUX _ SRCP and the AUX negative output end AUX _ SRCN under the control of the AUX amplitude parameter enabling signal;
and step 3: and an AUX positive input end voltage-dividing resistor R1, an AUX negative input end voltage-dividing resistor R2 and a switch chip voltage-dividing resistor between the AUX input end and the AUX output end form corresponding resistor voltage-dividing values to adjust the amplitude of the AUX receiving signal.
And 4, step 4: when the AUX receives data, the electronic switch chip U1 closes to receive the AUX amplitude parameter enabling signal, the electronic switch chip U1 disconnects the connection between the AUX positive output end AUX _ SRCP and the AUX negative output end AUX _ SRCN, and at the moment, the AUX receiving signal is directly reversely transmitted to the AUX input end from the AUX output end in the AUX output channel amplitude adjusting device.
The display module testing device comprises an FPGA chip, an amplitude adjusting device of an AUX output channel in a DP interface, a PC (computer), a DP driving chip, a protection interface circuit and the DP interface, wherein the FPGA chip is used for realizing the generation and control of DP signals and the interaction with the PC on the upper layer; the DP driving chip is used for realizing adjustment and driving of DP signals; the interface protection circuit protects against back-flow and against static electricity, thereby protecting the device from damage. The DP interface is used for connecting the display module to be tested. And the amplitude adjusting device of the AUX output channel in the DP interface is used for realizing amplitude adjustment of the AUX signal in the DP interface.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (9)
1. The utility model provides a AUX output channel amplitude adjusting device in DP interface which characterized in that: the electronic switch chip is used for gating the corresponding switch chip voltage dividing resistors to be connected between the AUX positive electrode output end and the AUX negative electrode output end under the control of various AUX amplitude parameter enabling signals;
the AUX receiving signal amplitude between the AUX positive output end and the AUX negative output end is the amplitude of the AUX sending signal and is the gated switch chip divider resistance/(AUX positive input end divider resistance + AUX negative input end divider resistance + gated switch chip divider resistance).
2. The apparatus of claim 1, wherein the apparatus for adjusting the amplitude of the AUX output channel in the DP interface comprises: and the resistance values of the voltage dividing resistor at the AUX positive input end and the voltage dividing resistor at the AUX negative input end are equal.
3. The apparatus of claim 1, wherein the apparatus for adjusting the amplitude of the AUX output channel in the DP interface comprises: the switch A1 interface of the electronic switch chip is connected with the AUX positive electrode output end through a switch chip voltage-dividing resistor R3, the switch B1 interface is connected with the AUX negative electrode output end, and the AUX amplitude parameter enabling signal SW1 received by the electronic switch chip is used for controlling the switch A1 interface of the electronic switch chip to be connected with the switch B1 interface.
4. The apparatus of claim 1, wherein the apparatus for adjusting the amplitude of the AUX output channel in the DP interface comprises: the switch A2 interface of the electronic switch chip is connected with the AUX positive electrode output end through a switch chip voltage-dividing resistor R4, the switch B2 interface is connected with the AUX negative electrode output end, and the AUX amplitude parameter enabling signal SW2 received by the electronic switch chip is used for controlling the switch A2 interface of the electronic switch chip to be connected with the switch B2 interface.
5. The apparatus of claim 1, wherein the apparatus for adjusting the amplitude of the AUX output channel in the DP interface comprises: the switch A3 interface of the electronic switch chip is connected with the AUX positive electrode output end through a switch chip voltage-dividing resistor R5, the switch B3 interface is connected with the AUX negative electrode output end, and the AUX amplitude parameter enabling signal SW3 received by the electronic switch chip is used for controlling the switch A3 interface of the electronic switch chip to be connected with the switch B3 interface.
6. The apparatus of claim 1, wherein the apparatus for adjusting the amplitude of the AUX output channel in the DP interface comprises: the switch A4 interface of the electronic switch chip is connected with the AUX positive electrode output end through a switch chip voltage-dividing resistor R6, the switch B4 interface is connected with the AUX negative electrode output end, and the AUX amplitude parameter enabling signal SW4 received by the electronic switch chip is used for controlling the switch A4 interface of the electronic switch chip to be connected with the switch B4 interface.
7. The apparatus of claim 1, wherein the apparatus for adjusting the amplitude of the AUX output channel in the DP interface comprises: and each logic control input interface of the electronic switch chip, which is used for receiving various AUX amplitude parameter enabling signals, is grounded through a corresponding pull-down resistor.
8. A method for adjusting amplitude of AUX output channel in DP interface of the device of claim 1, comprising the steps of:
step 1: when the AUX sends data, the electronic switch chip receives an AUX amplitude parameter enabling signal;
step 2: the electronic switch chip gates a corresponding switch chip voltage dividing resistor to be connected between the AUX positive output end and the AUX negative output end under the control of the AUX amplitude parameter enabling signal;
and step 3: and the voltage dividing resistor of the AUX positive input end, the voltage dividing resistor of the AUX negative input end and the voltage dividing resistor of the switch chip between the AUX input end and the AUX output end form corresponding resistor voltage dividing values to adjust the amplitude of the AUX receiving signal.
9. The method of claim 8, wherein the AUX output channel amplitude adjustment method comprises: and 4, step 4: when the AUX receives data, the electronic switch chip closes to receive the AUX amplitude parameter enabling signal, the electronic switch chip disconnects the connection between the AUX positive output end and the AUX negative output end, and at the moment, the AUX receiving signal is directly reversely transmitted to the AUX input end from the AUX output end in the AUX output channel amplitude adjusting device.
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| CN201810251013.4A CN108597427B (en) | 2018-03-26 | 2018-03-26 | Amplitude adjusting device and method for AUX output channel in DP interface |
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| US8570092B2 (en) * | 2011-12-26 | 2013-10-29 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Control circuit for connector |
| CN104821484A (en) * | 2015-04-30 | 2015-08-05 | 无锡亮源激光技术有限公司 | Pulse modulation drive circuit of miniature semiconductor laser |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004215469A (en) * | 2003-01-09 | 2004-07-29 | Renesas Technology Corp | Switching power supply and semiconductor integrated circuit for controlling power supply |
| TWI372335B (en) * | 2008-03-21 | 2012-09-11 | Mstar Semiconductor Inc | An electronic apparatus and an auto wake-up circuit |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2912099Y (en) * | 2006-06-19 | 2007-06-13 | 刘程宇 | Mobile power source circuit having CUK converter |
| CN101277395A (en) * | 2008-04-09 | 2008-10-01 | 深圳市创凯电子有限公司 | Method and apparatus for partitioning HDMI and Display Port image signal |
| US8570092B2 (en) * | 2011-12-26 | 2013-10-29 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Control circuit for connector |
| CN103050073A (en) * | 2012-12-26 | 2013-04-17 | 武汉精测电子技术有限公司 | DP (Digital Processing) decoding and automatic resolution adjusting liquid crystal display module testing method and device |
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