CN111865292A - Signal correction device, method and time sequence controller - Google Patents
Signal correction device, method and time sequence controller Download PDFInfo
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- CN111865292A CN111865292A CN202010740290.9A CN202010740290A CN111865292A CN 111865292 A CN111865292 A CN 111865292A CN 202010740290 A CN202010740290 A CN 202010740290A CN 111865292 A CN111865292 A CN 111865292A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 230000002159 abnormal effect Effects 0.000 claims abstract description 18
- 239000002699 waste material Substances 0.000 abstract description 9
- 230000005856 abnormality Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000011664 signaling Effects 0.000 description 6
- BXLICFUSUZPSHT-UHFFFAOYSA-N 1-(4-chlorophenyl)-3-fluoropropan-2-amine Chemical compound FCC(N)CC1=CC=C(Cl)C=C1 BXLICFUSUZPSHT-UHFFFAOYSA-N 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 229910052802 copper Inorganic materials 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 invention 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 used for detecting the peak-to-peak value of the converted analog signal; the comparison module is connected with the processing module and used for comparing the peak-to-peak value with a preset value and outputting a corresponding level signal; the switch module is connected with the comparison module and 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 used for setting corresponding resistance values to compensate the input signals. The application outputs correct signals through internal compensation, effectively solves the problem of abnormal signals caused by terminal resistance, saves time for reworking and cost waste, and improves customer satisfaction.
Description
Technical Field
The invention relates to the technical field of display, in particular to a signal correction device, a signal correction method and a time sequence controller.
Background
In a liquid crystal display, fig. 1 shows a schematic diagram of LVDS signaling in the prior art, and as shown in fig. 1, LVDS signaling generally consists of three parts: the differential signal transmitter, the differential signal interconnect, the differential signal receiver. The differential signal transmitter converts the unbalanced transmission TTL signals into balanced transmission LVDS signals. The differential signal receiver converts the LVDS signals transmitted in a balanced mode into TTL signals transmitted in an unbalanced mode. The differential signal interconnect includes a link (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 (typically 3.5mA) driving a pair of differential lines, and the LVDS receiver has a very high input impedance, so that most of the current output by the driver flows through a 100 Ω matched resistor and produces a voltage of about 350mV at the input of the receiver.
For the existing LVDS transmission module, the inventor of the application finds that the condition of lighting black screen often occurs when the vehicle-mounted type client combines the whole machine by utilizing the existing LVDS transmission module. The inventor of the present application finds that the reason for this is that the FPCA (short for Flexible Printed Circuit Assembly, meaning FPC component soldering or assembling) is knocked off when the client is assembled due to the terminal resistor in the differential signal interconnector, so that the LVDS signal is abnormally transmitted to cause a black screen, which further causes waste of heavy working time and cost, and the customer satisfaction is reduced.
Disclosure of Invention
In view of this, the present invention provides a signal correction device, method and timing controller, which can output correct signals through internal compensation, effectively solve the signal abnormality caused by abnormal terminal resistance, save rework time and cost waste, and improve customer satisfaction.
In order to achieve the above object, a first aspect of embodiments of the present invention provides a signal correction apparatus, which includes as an implementation manner: the device 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-to-peak value of the converted analog signal; the comparison module is connected with the processing module and used for comparing the peak-to-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 used for setting corresponding resistance values to compensate the input signals.
In one embodiment, the input signal is an LVDS signal.
As an embodiment, the resistance compensation module includes a register and a resistance module, and the register is connected to the resistance module and is used for setting a corresponding resistance value.
In one embodiment, the resistor module includes a plurality of resistors connected in parallel.
As one embodiment, the resistor module further includes a control unit, and the control unit is configured to control the resistor to be turned on or off according to a resistance value setting command of the register.
As one implementation, the processing module is an MCU.
In one embodiment, the input signal is a Mini-LVDS signal.
To achieve the above object, a second aspect of the embodiments of the present invention provides a timing controller, including the signal correction apparatus according to any one of the above embodiments.
As an implementation manner, the timing controller further includes an LVDS signal receiving module, an image processing module, and a Mini-LVDS signal transmitting module, the LVDS signal receiving module is connected to the signal correcting 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.
In order to achieve the above object, a third aspect of the embodiments of the present invention provides a signal correction method, which includes as one implementation:
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 when the input signal is judged to be abnormal according to the level signal, compensating the input signal.
In summary, the signal correction apparatus, the signal correction method and the timing controller according to 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 the transmission line and is configured to convert an input signal on the transmission line into an analog signal; the processing module is connected with the digital-to-analog conversion module and used for detecting the peak-to-peak value of the converted analog signal; the comparison module is connected with the processing module and used for comparing the peak-to-peak value with a preset value and outputting a corresponding level signal; the switch module is connected with the comparison module and 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 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 terminal resistance abnormality, saves reworking time and cost waste, and improves the customer satisfaction.
Drawings
FIG. 1 is a schematic diagram illustrating LVDS signaling in the prior art;
FIG. 2 shows a schematic representation of a scheme of an embodiment of the invention;
fig. 3 is a schematic structural diagram of a signal correction apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a timing controller according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a signal correction method according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer and more complete, the technical solutions of the present invention will be described below with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all, of the embodiments of the present invention, and are only used for explaining the present invention, and are not used to limit the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Reference throughout this patent specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention.
Fig. 2 shows a schematic diagram of an embodiment of the present invention, as shown in fig. 2, for the termination resistor, which is used to prevent signal reflection at the medium termination and reduce electromagnetic interference. To terminate the circulating current signal, it is desirable to place the termination resistor as close to the receiver input as possible. The terminal resistor may fall off due to FPCA (short for FPC component soldering or assembling) impact 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 terminal resistance abnormality, saves reworking time and cost waste, and improves the customer satisfaction. As shown in fig. 2, when the termination resistor is dropped or abnormal, the signal is compensated by the termination resistor built inside the termination (e.g., timing controller). Of course, the concept of the present invention may also be applied to the Mini-LVDS signals, for example, when the timing controller outputs the Mini-LVDS signals to the source driver, and when the terminal resistance of the output signal is abnormal, a corresponding terminal resistance may also be built in the source driver to compensate the Mini-LVDS signals.
The specific technical solutions are described in detail below with reference to the accompanying drawings. Fig. 3 is a schematic structural diagram of a signal correction apparatus according to an embodiment of the present invention, and as shown in fig. 3, the signal correction apparatus 10 includes: the digital-to-analog conversion circuit comprises a digital-to-analog conversion module 11, a processing module 12, a comparison module 13, a switch module 14 and a 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 to the digital-to-analog conversion module 11 and configured to detect a peak-to-peak value of the converted analog signal; the comparison module 13 is connected to the processing module 12, and is configured to compare the peak-to-peak value with a preset value and output 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 the input signal on the transmission line into an analog signal, that is, the digital-to-analog conversion module 11 collects the input signal transmitted to the terminal on the transmission line, and in order to detect the 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 a peak-to-peak value of the converted analog signal, i.e. a difference between a highest value and a lowest value in one period of the analog signal waveform, i.e. a range between the maximum value and the minimum value. After the peak value of the analog signal is obtained, the comparison module 13 compares the peak value with a standard value preset according to a circuit standard, and when the peak value is different from the set standard value, the switch module 14 turns on the resistance compensation module 15 to set a corresponding resistance value to compensate the input signal.
It should be noted that, in the embodiment of the present invention, the resistance adjustment is not performed on the terminal resistor itself, and the embodiment of the present invention does not calculate the terminal resistor resistance value required on the transmission line according to the peak-to-peak value, but only judges whether the signal is abnormal, so as to determine whether the terminal resistor of the terminal input signal interface falls off. After the terminal resistance is judged to drop by comparing the peak-to-peak value of the input signal with a preset standard value, the terminal resistance in the terminal is built through the resistance compensation module 15 to compensate the input signal, reworking of FPCA is not needed, reworking time and cost waste are saved, and customer satisfaction is improved.
In one embodiment, the input signal is an LVDS signal.
Specifically, an LVDS (Low-Voltage Differential Signaling) Low-Voltage Differential Signaling is a Differential Signaling technology with Low power consumption, Low bit error rate, Low crosstalk and Low radiation, the transmission technology can reach over 155Mbps, the core of the LVDS technology is to adopt an extremely Low Voltage swing high-speed Differential transmission data, and point-to-point or point-to-multipoint connection can be realized, and a transmission medium of the LVDS technology can be a copper PCB connection line or a balanced cable.
In another embodiment, the input signal is Mini-LVDS;
specifically, Mini-LVDS is a high-speed serial interface, which is unidirectional, and data can only be transmitted from the timing control chip to the column driver, so that the signal correction apparatus 10 provided in the embodiment of the present invention needs to be disposed in the column driver, i.e. the source driver, when the Mini-LVDS needs to be compensated compared to the LVDS signal. That is, the present invention can use the Mini-LVDS signal abnormality correction, the signal correction device 10 detects the output Mini-LVDS signal, and when the output signal terminal resistance is abnormal, the internal terminal 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, and 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 resistor value setting command, and it can be understood that the corresponding resistor value set by the resistor module is equal to the dropped terminal resistor value.
In one embodiment, the resistance module includes a plurality of resistors connected in parallel.
Specifically, the resistance values of the transmission lines of different models are different, the corresponding terminal matching resistors are also different, and for better meeting the requirement of setting the resistance values of different models, the resistor module in the embodiment is provided with a plurality of resistors connected in parallel, and the register can set the terminal resistors with different resistance values according to different resistance value setting commands, so that the compatibility of the device is improved.
In an embodiment, the resistor module further includes a control unit, and the control unit is configured to control on or off of each resistor in the resistor module according to the resistance 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 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 used for detecting the peak-to-peak value of the converted analog signal; the comparison module is connected with the processing module and used for comparing the peak-to-peak value with a preset value and outputting a corresponding level signal; the switch module is connected with the comparison module and 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 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 terminal resistance abnormality, saves reworking time and cost waste, and improves the customer satisfaction.
The embodiment of the invention also provides a time schedule controller which comprises the signal correction device in any one of the above embodiments.
Fig. 4 is a schematic structural diagram of the timing controller according to an embodiment of the present invention, as shown in fig. 4, in an implementation, the timing controller further includes an LVDS signal receiving module 16, an image processing module 17, and a Mini-LVDS signal transmitting module 18, the LVDS signal receiving module 16 is connected to the signal correction apparatus 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 the embodiment, the signal correction device integrated in the time schedule controller compensates the input signal through the built-in terminal resistor to output correct signals, so that the signal abnormality caused by the terminal resistor abnormality is effectively solved, the time and cost waste for reworking is saved, and the customer satisfaction is improved.
An embodiment of the present invention further provides a signal correction method, and in an implementation manner, the signal correction method includes the following steps:
step S1: an input signal on a transmission line is converted into an analog signal.
Step S2: and detecting the peak value of the converted analog signal.
Step S3: and comparing the peak-to-peak value with a preset value and outputting a corresponding level signal.
Step S4: and when the input signal is judged to be abnormal according to the level signal, compensating the input signal.
Specifically, when the method is applied to the TCON, the digital-to-analog conversion module is connected to the transmission line, and is configured to convert 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 used for detecting the peak-to-peak value of the converted analog signal; the comparison module is connected with the processing module and used for comparing the peak-to-peak value with a preset value and outputting a corresponding level signal; the switch module is connected with the comparison module and 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 used for setting corresponding resistance values to compensate the input signals.
It should be noted that, in the signal correction method and the signal correction apparatus provided in the embodiments of the present invention, working principles and beneficial effects of the two are in one-to-one correspondence, and thus, details are not described again.
Therefore, the signal correction method provided by the embodiment of the present invention converts the input signal on the transmission line into the analog signal, detects the peak-to-peak value of the converted analog signal, 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. The invention compensates the input signal through the built-in terminal resistor to output correct signal, effectively solves the signal abnormality caused by the terminal resistor abnormality, saves the reworking time and cost waste, and improves the customer satisfaction.
The preferred embodiments of the present invention have been described in detail 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 technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. The various features described in the foregoing detailed description may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (10)
1. A signal correction device, characterized in that the signal correction device 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 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 used for comparing the peak-to-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 used for setting corresponding resistance values to compensate the input signals.
2. The signal correction device of claim 1, wherein the input signal is an LVDS signal.
3. The signal correction device of claim 1, wherein the resistance compensation module comprises a register and a resistance module, and the register is connected to the resistance module and is used for setting a corresponding resistance value.
4. The signal correction device of claim 3, wherein the resistance module comprises a plurality of resistors connected in parallel.
5. The signal correction device of claim 4, wherein the resistor module further comprises a control unit, and the control unit is configured to control the resistor to be turned on or off according to a resistance value setting command of the register.
6. The signal correction device of claim 1, wherein the processing module is an MCU.
7. The signal correction device of claim 1, wherein the input signal is a Mini-LVDS signal.
8. A timing controller comprising the signal correction apparatus of any one of claims 1 to 7.
9. The timing controller according to claim 8, 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 correcting 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.
10. A method of signal correction, 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;
and when the input signal is judged to be abnormal according to the level signal, compensating the input signal.
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| CN202010740290.9A CN111865292A (en) | 2020-07-28 | 2020-07-28 | Signal correction device, method and time sequence controller |
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