CN111865292B - Signal correction device, method and time sequence controller - Google Patents
Signal correction device, method and time sequence controller Download PDFInfo
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- CN111865292B CN111865292B CN202010740290.9A CN202010740290A CN111865292B CN 111865292 B CN111865292 B CN 111865292B CN 202010740290 A CN202010740290 A CN 202010740290A CN 111865292 B CN111865292 B CN 111865292B
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- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000011664 signaling Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/003—Modifications for increasing the reliability for protection
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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
- G09G3/20—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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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Abstract
The application relates to a signal correction device, a signal correction method and a time sequence controller, which comprise a digital-to-analog conversion module, a processing module, a comparison module, a switch module and a resistance compensation module, wherein the digital-to-analog conversion module is connected with a transmission line and is used for converting an input signal on the transmission line into an analog signal; the processing module is connected with the digital-to-analog conversion module and is used for detecting the peak value of the converted analog signal; the comparison module is connected with the processing module and is used for comparing the peak value with a preset value and outputting a corresponding level signal; the switch module is connected with the comparison module and is used for switching on the resistance compensation module when the input signal is judged to be abnormal according to the level signal; the resistance compensation module is connected with the transmission line and is used for setting corresponding resistance values to compensate the input signals. The application outputs correct signals through internal compensation, effectively solves the signal abnormality caused by abnormal terminal resistance, saves reworking time and cost waste, and improves customer satisfaction.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a signal correction device, a signal correction method, and a timing controller.
Background
In a liquid crystal display, fig. 1 is a schematic diagram showing the composition of LVDS signaling in the prior art, and as shown in fig. 1, LVDS signaling generally consists of three parts: differential signal transmitter, differential signal interconnect, differential signal receiver. The differential signal transmitter converts the unbalanced transmitted TTL signal into a balanced transmitted LVDS signal. The differential signal receiver converts the balanced transmission LVDS signals into unbalanced transmission TTL signals. The differential signal interconnect includes a trace (cable or PCB trace) and a termination matching resistor. According to the IEEE specification, the resistance is 100 ohms. In practice, it is usually chosen to be 100 ohms or 120 ohms. The LVDS physical interface provides approximately 400mV swing using a 1.2V bias voltage as a reference. The LVDS driver consists of a current source driving a differential pair (typically 3.5 mA), and the LVDS receiver has a very high input impedance, so that most of the current output by the driver flows through a 100 q matching resistor and produces a voltage of about 350mV at the input of the receiver.
For the existing LVDS transmission module, the inventor finds that the condition of spot light blackout often occurs when the vehicle-mounted machine is assembled by the client of the vehicle-mounted machine by utilizing the existing LVDS transmission module. The inventor researches and discovers that the reason for the situation is that FPCA (Flexible Printed Circuit Assembly is short for meaning FPC element soldering tin or assembly) is impacted to drop when the client is assembled completely due to the terminal resistor in the differential signal interconnection device, so that abnormal transmission of LVDS signals is caused to cause a black screen, further, the waste of reworking time and cost is caused, and the problem of customer satisfaction is reduced.
Disclosure of Invention
In view of this, the invention provides a signal correction device, a signal correction method and a time sequence controller, which can output correct signals through internal compensation, effectively solve signal anomalies caused by terminal resistance anomalies, save reworking time and cost waste and improve customer satisfaction.
To achieve the above object, a first aspect of an embodiment of the present invention provides a signal correction device, as one embodiment, the signal correction device includes: the digital-to-analog conversion module is connected with the transmission line and is used for converting an input signal on the transmission line into an analog signal; the processing module is connected with the digital-to-analog conversion module and is used for detecting the peak-to-peak value of the converted analog signal; the comparison module is connected with the processing module and is used for comparing the peak value with a preset value and outputting a corresponding level signal; the switch module is connected with the comparison module and is used for switching on the resistance compensation module when the input signal is judged to be abnormal according to the level signal; the resistance compensation module is connected with the transmission line and is used for setting corresponding resistance values to compensate the input signals.
As one embodiment, the input signal is an LVDS signal.
As one implementation manner, the resistance compensation module comprises a register and a resistance module, wherein the register is connected with the resistance module and is used for setting corresponding resistance values.
As one embodiment, the resistor module includes a plurality of resistors connected in parallel.
As one implementation manner, the resistor module further comprises a control unit, and the control unit is used for controlling on or off of the resistor according to a resistance value setting command of the register.
As one implementation manner, the processing module is an MCU.
As one embodiment, the input signal is a Mini-LVDS signal.
In order to achieve the above object, a second aspect of the embodiment of the present invention provides a timing controller, which includes a signal correction device according to any one of the above embodiments.
As one implementation mode, the time schedule controller further comprises an LVDS signal receiving module, an image processing module and a Mini-LVDS signal transmitting module, wherein the LVDS signal receiving module is connected with the signal correction device, the image processing module is connected with the LVDS signal receiving module, and the Mini-LVDS signal transmitting module is connected with the image processing module.
To achieve the above object, a third aspect of the embodiment of the present invention provides a signal correction method, as one embodiment, the method including:
converting an input signal on a transmission line into an analog signal;
detecting the peak value of the converted analog signal;
Comparing the peak value with a preset value and outputting a corresponding level signal;
And compensating the input signal when the input signal is judged to be abnormal according to the level signal.
In summary, the signal correction device, the signal correction method and the timing controller provided by the embodiments of the present invention include a digital-to-analog conversion module, a processing module, a comparison module, a switch module and a resistance compensation module, where the digital-to-analog conversion module is connected to a transmission line and is used for converting an input signal on the transmission line into an analog signal; the processing module is connected with the digital-to-analog conversion module and is used for detecting the peak value of the converted analog signal; the comparison module is connected with the processing module and is used for comparing the peak value with a preset value and outputting a corresponding level signal; the switch module is connected with the comparison module and is used for switching on the resistance compensation module when the input signal is judged to be abnormal according to the level signal; the resistance compensation module is connected with the transmission line and is used for setting corresponding resistance values to compensate the input signals. The invention outputs correct signals through internal compensation, effectively solves the signal abnormality caused by abnormal terminal resistance, saves reworking time and cost waste, and improves customer satisfaction.
Drawings
FIG. 1 is a schematic diagram showing the composition of LVDS signaling in the prior art;
FIG. 2 shows a schematic representation of an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of a signal correction device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a timing controller according to an embodiment of the present invention;
fig. 5 is a flowchart of a signal correction method according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention, which are merely for explaining the present invention and are not limited thereto. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Reference in the specification to "one embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the example is included in at least one embodiment of the invention.
Fig. 2 shows a schematic diagram of an embodiment of the invention, as shown in fig. 2, for the termination resistor, which functions to prevent reflection of signals at the media termination while reducing electromagnetic interference. In order to terminate the loop signal, it is necessary to place the termination resistor as close as possible to the receiver input. And the terminal resistor may be dropped due to the impact of FPCA (Flexible Printed Circuit Assembly for short meaning solder or assembly of FPC elements) when the client is assembled, thereby causing abnormal transmission of LVDS signals and black screen. Therefore, the invention outputs correct signals through internal compensation, effectively solves the signal abnormality caused by abnormal terminal resistance, saves reworking time and cost waste, and improves customer satisfaction. As shown in fig. 2, when the termination resistor drops or is abnormal, the signal is compensated by the termination resistor built inside the termination (such as a timing controller). Of course, the concept of the invention can also be applied to Mini-LVDS signals, for example, when a timing controller outputs the Mini-LVDS signals to a source driver, when the output signal terminal resistance is abnormal, a corresponding terminal resistance can also be built in the source driver to compensate the Mini-LVDS signals.
The specific technical scheme is described in detail below with reference to the corresponding drawings. Fig. 3 is a schematic structural diagram of a signal correction device according to an embodiment of the present invention, and as shown in fig. 3, the signal correction device 10 includes: the digital-to-analog conversion module 11, the processing module 12, the comparison module 13, the switch module 14 and the resistance compensation module 15, wherein the digital-to-analog conversion module 11 is connected with a transmission line and is used for converting an input signal on the transmission line into an analog signal; the processing module 12 is connected with the digital-to-analog conversion module 11 and is used for detecting the peak value of the converted analog signal; the comparison module 13 is connected with the processing module 12 and is used for comparing the peak value with a preset value and outputting a corresponding level signal; the switch module 14 is connected with the comparison module 13 and is used for switching on the resistance compensation module 15 when the input signal is judged to be abnormal according to the level signal; the resistance compensation module 15 is connected to the transmission line, and is configured to set a corresponding resistance value to compensate the input signal.
Specifically, the digital-to-analog conversion module 11 is connected to the transmission line, and converts an input signal on the transmission line into an analog signal, that is, the digital-to-analog conversion module 11 collects an input signal transmitted to the terminal on the transmission line, so as to realize detection of characteristics of the input signal, the digital-to-analog conversion module 11 converts the input signal into the analog signal. The analog signal is then output to the processing module 12, and the processing module 12 detects the peak-to-peak value of the converted analog signal, i.e., the difference between the highest value and the lowest value, i.e., the range between the maximum and the minimum value, within one period of the waveform of the analog signal. After obtaining the peak-peak value of the analog signal, the comparison module 13 compares the peak-peak value with the standard value preset according to the circuit standard, and when there is a large difference between the peak-peak value and the set standard value, the resistance compensation module 15 is turned on by the switch module 14 to set a corresponding resistance value to compensate the input signal.
It is worth mentioning that, in the embodiment of the present invention, the resistance of the termination resistor is not adjusted, and the embodiment of the present invention does not calculate the resistance of the termination resistor required on the transmission line according to the peak-to-peak value, but only determines whether the signal is abnormal, so as to determine whether the termination resistor of the termination input signal interface drops. After judging that the terminal resistor falls off by comparing the peak-to-peak value of the input signal with a preset standard value, the terminal resistor in the terminal is built through the resistor compensation module 15 to compensate the input signal without reworking FPCA, so that reworking time and cost waste are saved, and customer satisfaction is improved.
In one embodiment, the input signal is an LVDS signal.
Specifically, the Low-Voltage differential signal (LVDS DIFFERENTIAL SIGNALING) is a differential signal technology with Low power consumption, low bit error rate, low crosstalk and Low radiation, the transmission technology can reach more than 155Mbps, the core of the LVDS technology is to adopt extremely Low Voltage swing high-speed differential transmission data, point-to-point or point-to-multipoint connection can be realized, and the transmission medium can be a copper PCB (printed circuit board) connection or a balanced cable.
In another embodiment, the input signal is Mini-LVDS;
Specifically, mini-LVDS is used as a high-speed serial interface, which is unidirectional, and data can only flow from the timing control chip to the column driver, so that the signal correction device 10 provided by the embodiment of the invention needs to be arranged in the column driver, namely the source driver, when the Mini-LVDS signal needs to be compensated compared with the LVDS signal. That is, the present invention can apply the Mini-LVDS signal anomaly correction, the signal correction device 10 detects the output Mini-LVDS signal, and when the output signal termination resistance is abnormal, the internal termination resistance setting of the source driver is started to compensate the signal.
In one embodiment, the resistance compensation module 15 includes a register and a resistance module, where the register is connected to the resistance module and is used for setting a corresponding resistance value.
Specifically, the register is configured to set the resistor module according to a preset terminal resistance value setting command, and it can be understood that the corresponding resistance value set by the resistor module is equal to the dropped terminal resistance value.
In one embodiment, the resistor module includes a plurality of resistors connected in parallel.
Specifically, the transmission line resistance values of different models are different, the corresponding terminal matching resistance values are different, and in order to better adapt to the resistance value setting requirements of different models, the resistor module in the embodiment can set the terminal resistances of different resistance values according to different resistance value setting commands by setting a plurality of resistors connected in parallel, so that the compatibility of the device is improved.
In an embodiment, the resistor module further includes a control unit, where the control unit is configured to control on or off of each resistor in the resistor module according to a resistor value setting command of the register.
In one embodiment, the processing module 12 is an MCU.
Therefore, the signal correction device provided by the embodiment of the invention comprises a digital-to-analog conversion module, a processing module, a comparison module, a switch module and a resistance compensation module, wherein the digital-to-analog conversion module is connected with a transmission line and is used for converting an input signal on the transmission line into an analog signal; the processing module is connected with the digital-to-analog conversion module and is used for detecting the peak value of the converted analog signal; the comparison module is connected with the processing module and is used for comparing the peak value with a preset value and outputting a corresponding level signal; the switch module is connected with the comparison module and is used for switching on the resistance compensation module when the input signal is judged to be abnormal according to the level signal; the resistance compensation module is connected with the transmission line and is used for setting corresponding resistance values to compensate the input signals. The invention outputs correct signals through internal compensation, effectively solves the signal abnormality caused by abnormal terminal resistance, saves reworking time and cost waste, and improves customer satisfaction.
The embodiment of the invention also provides a time sequence controller which comprises the signal correction device in any one of the embodiments.
Fig. 4 is a schematic structural diagram of a timing controller according to an embodiment of the present invention, as shown in fig. 4, in an embodiment, the timing controller further includes an LVDS signal receiving module 16, an image processing module 17, and a Mini-LVDS signal transmitting module 18, where the LVDS signal receiving module 16 is connected to the signal correction device 10, the image processing module 17 is connected to the LVDS signal receiving module 16, and the Mini-LVDS signal transmitting module 18 is connected to the image processing module 17.
Specifically, in this embodiment, the signal correction device integrated inside the timing controller compensates the input signal through the terminal resistor built inside to output a correct signal, so as to effectively solve the signal abnormality caused by the terminal resistor abnormality, save reworking time and cost waste, and improve customer satisfaction.
The embodiment of the invention also provides a signal correction method, in an implementation manner, the signal correction method comprises the following steps:
step S1: the input signal on the transmission line is converted into an analog signal.
Step S2: and detecting the peak-to-peak value of the converted analog signal.
Step S3: and comparing the peak value with a preset value and outputting a corresponding level signal.
Step S4: and compensating the input signal when the input signal is judged to be abnormal according to the level signal.
Specifically, when the method is applied to TCON, the digital-to-analog conversion module is connected with the transmission line and is used for converting the LVDS input signal on the transmission line into an analog signal; the processing module is connected with the digital-to-analog conversion module and is used for detecting the peak value of the converted analog signal; the comparison module is connected with the processing module and is used for comparing the peak value with a preset value and outputting a corresponding level signal; the switch module is connected with the comparison module and is used for switching on the resistance compensation module when the input signal is judged to be abnormal according to the level signal; the resistance compensation module is connected with the transmission line and is used for setting corresponding resistance values to compensate the input signals.
It should be noted that, the signal correction method provided by the embodiment of the present invention corresponds to the signal correction device, and the working principles and beneficial effects of the two correspond to each other one by one, so that no description is repeated.
Therefore, the signal correction method provided by the embodiment of the invention converts the input signal on the transmission line into the analog signal, then detects the peak-to-peak value of the converted analog signal, further compares the peak-to-peak value with the preset value and outputs the corresponding level signal, and finally compensates the input signal by building the internal terminal resistor when the input signal is judged to be abnormal according to the level signal. According to the invention, the input signal is compensated by the built-in terminal resistor to output a correct signal, so that signal abnormality caused by terminal resistor abnormality is effectively solved, reworking time and cost waste are saved, and customer satisfaction is improved.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention. The individual technical features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Claims (8)
1. A signal correction device, characterized in that the signal correction device comprises: the digital-to-analog conversion module, the processing module, the comparison module, the switch module and the resistance compensation module, wherein,
The digital-to-analog conversion module is connected with the transmission line and is used for converting an input signal on the transmission line into an analog signal; the input signal is an LVDS signal;
The processing module is connected with the digital-to-analog conversion module and is used for detecting the peak-to-peak value of the converted analog signal;
The comparison module is connected with the processing module and is used for comparing the peak value with a preset value and outputting a corresponding level signal;
The switch module is connected with the comparison module and is used for switching on the resistance compensation module when the input signal is judged to be abnormal according to the level signal;
The resistance compensation module is connected with the transmission line and is used for setting corresponding resistance values, constructing a terminal resistor in the terminal and compensating the input signal; the resistor compensation module comprises a register and a resistor module, wherein the register is used for setting the resistance value of the resistor module to be the falling terminal resistance value according to a preset terminal resistance value setting command.
2. The signal correction device of claim 1 wherein the resistor module comprises a plurality of resistors connected in parallel.
3. The signal correction device according to claim 2, wherein the resistor module further comprises a control unit for controlling on or off of the resistor according to a resistance value setting command of the register.
4. The signal correction device of claim 1, wherein the processing module is an MCU.
5. The signal correction device of claim 1, wherein the input signal is replaced with a Mini-LVDS signal.
6. A timing controller comprising the signal correction device of any one of claims 1-4.
7. The timing controller of claim 6, further comprising an LVDS signal receiving module, an image processing module, and a Mini-LVDS signal transmitting module, wherein the LVDS signal receiving module is connected to the signal correction device, the image processing module is connected to the LVDS signal receiving module, and the Mini-LVDS signal transmitting module is connected to the image processing module.
8. A signal correction method for a signal correction apparatus according to any one of claims 1 to 5, comprising:
converting an input signal on a transmission line into an analog signal;
detecting the peak value of the converted analog signal;
Comparing the peak value with a preset value and outputting a corresponding level signal;
when the input signal is judged to be abnormal according to the level signal, a terminal resistor in the terminal is built, and the input signal is compensated, wherein the resistance value is set to be the falling terminal resistance value according to a preset terminal resistance value setting command.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106228938A (en) * | 2016-06-28 | 2016-12-14 | 上海中航光电子有限公司 | Signal accesses circuit and the display device comprising it |
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| TW520518B (en) * | 2001-11-16 | 2003-02-11 | Via Tech Inc | Circuit having self-compensation terminal resistor |
| US6744275B2 (en) * | 2002-02-01 | 2004-06-01 | Intel Corporation | Termination pair for a differential driver-differential receiver input output circuit |
| US8008944B2 (en) * | 2008-11-25 | 2011-08-30 | Qualcomm Incorporated | Low voltage differential signaling driver with programmable on-chip resistor termination |
| JP2010212752A (en) * | 2009-03-06 | 2010-09-24 | Nec Corp | Lvds driver, lvds circuit, and resistance value adjusting method and current value adjusting method for lvds circuit |
| US8476922B2 (en) * | 2011-05-27 | 2013-07-02 | Analog Devices, Inc. | Balanced impedance method for differential signaling |
| CN202634377U (en) * | 2012-06-11 | 2012-12-26 | 北京京东方光电科技有限公司 | Device for setting terminal resistance value and time sequence controller |
| CN103983856B (en) * | 2014-05-09 | 2017-03-01 | 京东方科技集团股份有限公司 | A kind of Low Voltage Differential Signal Interface Matching resistance automatic checkout equipment and method |
| CN111402770B (en) * | 2020-04-21 | 2022-05-24 | 昆山龙腾光电股份有限公司 | Testing device for display device |
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| CN106228938A (en) * | 2016-06-28 | 2016-12-14 | 上海中航光电子有限公司 | Signal accesses circuit and the display device comprising it |
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