CN202189535U - Display and control circuit and display and control device with signal monitoring function - Google Patents
Display and control circuit and display and control device with signal monitoring function Download PDFInfo
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Abstract
The embodiment of the utility model provides a display and control circuit with a signal monitoring function, which comprises a signal detection module and a display driving module, wherein the signal detection module is used for receiving input data signals and detecting output enable signals of the input data signals, and the enable signals are connected with the output end of the display driving module. The display driving module is connected with external light-emitting diode (LED) devices and used for receiving input data signals and outputting signals to control the LED devices, and the enable signals close or open the output end of the display driving module. The embodiment of the utility model further discloses a display and control system with the signal monitoring function. By means of the scheme of the display and control circuit and the display and control system with the signal monitoring function, the signal monitoring function is integrated in an LED display driving chip so that reliability of the LED display driving chip is improved, shortening of service life of the driving chip and an LED lamp caused by signal interference is avoided, and possibility of device burning is reduced.
Description
Technical Field
The utility model relates to a digital communication field, particularly, the utility model relates to a display control circuit and equipment with signal monitoring function.
Background
Because the LED display application products have the advantages of low price, flexible configuration, high reaction speed and the like, the LED display application products play an increasingly important role in our daily life. For example, LED display products are used for bus route display, large time telling screens, bank interest rate display screens, commercial advertising screens, and the like.
LED display products are very popular in practical applications, and such products focus on the control of changes in real graphics and the precision control of rich colors. Therefore, display data transmission and display precision control are basic requirements for realizing functions of the LED display system. But at the same time, because of the special application environment requirements of the products, the reliability is generally more strict. The higher the reliability, the more stable the LED display is, and the longer the service life is.
In the existing system technology, in the process of powering on or turning off an LED screen, because some uncertain factors inside the system, such as residual charges on a capacitor, damage to a data line, etc., easily cause the LED lamp to be turned on by mistake, when the LED is in an uncontrolled condition, the LED may be always in a large current conducting state, which may cause the service lives of a driving chip and the LED lamp to be reduced, or even possibly burnt out.
Therefore, it is necessary to provide a corresponding and effective technical solution to improve the performance of the driving circuit, increase the service life of the LED device, and optimize the performance of the display system.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an aim at solving one of above-mentioned technical defect at least, through increasing signal detection function in drive circuit very much, improved LED and showed drive chip's reliability, avoid causing drive chip and LED product life to reduce because signal interference.
In order to achieve the above object, an embodiment of the present invention provides a display driving circuit, which includes a signal detection module and a display driving module,
the signal detection module is used for receiving an input data signal and detecting an input data signal output enable signal, and the enable signal is connected with the output of the display driving module;
the display driving module is connected with an external LED device and used for receiving the input data signal and outputting a signal to control the LED device, wherein the enabling signal turns off or on the output of the display driving module.
On the other hand, the embodiment of the present invention further provides a display control system, which comprises a main control device, a decoding driving unit and a display driving circuit,
the main control device is used for controlling the decoding driving unit, selecting corresponding LED equipment for display, and transmitting an input data signal to the display driving circuit;
the decoding driving unit is used for selecting corresponding LED equipment according to the control signal of the main control device;
the display driving circuit is used for controlling the display output of the LED equipment selected by the decoding driving unit according to an input data signal and comprises a signal detection module and a display driving module,
the signal detection module is used for receiving an input data signal and detecting an input data signal output enable signal, and the enable signal is connected with the output of the display driving module;
the display driving module is connected with an external LED device and used for receiving the input data signal and outputting a signal to control the LED device, wherein the enabling signal turns off or on the output of the display driving module.
The utility model provides an above-mentioned scheme is integrated to the LED with the signal detection function and is shown driver chip to improve LED and shown driver chip's reliability, avoided signal interference to lead to driver chip and LED lamp life to reduce, reduced the device phenomenon of burning out. In addition, in practical application, under the condition that the system of designing according to current scheme does not do any change, can directly use the technical scheme of the utility model, it is compatible with ordinary LED display driver chip, like this under the compatible prerequisite of assurance system, the reliability obtains bigger promotion. The utility model provides an above-mentioned scheme, the realization scheme is simple, high-efficient.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a prior art LED display system;
fig. 2 is a functional schematic diagram of a display driving circuit according to an embodiment of the present invention;
FIG. 3 is a functional diagram of another display driver circuit according to an embodiment of the present invention;
fig. 4 is a functional schematic diagram of a signal detection module according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an LED driving port enabling module according to an embodiment of the present invention;
fig. 6 is a circuit diagram of the embodiment of the present invention;
FIG. 7 is a circuit diagram of a frequency detection module;
fig. 8 is a schematic view of a display control system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
To facilitate understanding of the present invention, a structure diagram of a conventional LED display system in the prior art is first introduced, as shown in fig. 1. The system controls the opening and closing of the corresponding row of the LED screen through the decoding driving unit, and opens and closes the controlled column through the LED driving chip. Each intersection of rows and columns controls one display unit, namely an LED lamp, so that display driving of the LED screen is realized.
The LED display driver chip stores data by the clock signal CLK so that when the driver chip turns on the corresponding column, if the parallel clock CLK suddenly stops transmitting, the on state is maintained. At this time, if the row control signal sent by the decoding driving unit has interference, the interference signal may open the corresponding row, so that the corresponding LED lamp is turned on. When the LED is in a large current conducting state all the time under an uncontrolled condition, the service life of the row scan driving chip and the LED lamp is reduced, and even the LED lamp may be burned out.
The utility model provides a, with signal detection function integrated to LED display driver chip in to improved LED display driver chip's reliability, avoided signal interference to cause driver chip and LED lamp life to reduce, burn out the phenomenon even. In using, the utility model provides a system does not do under the condition of any change to current system, can show driver chip with ordinary LED and be compatible, like this under the compatible prerequisite of assurance system, the reliability obtains bigger promotion.
In order to realize the utility model discloses its purpose, the embodiment of the utility model provides a display drive circuit is proposed, including signal detection module and display drive module.
Specifically, the signal detection module is used for receiving an input data signal, detecting an input data signal output enable signal, and connecting the enable signal with the output of the display driving module; the display driving module is connected with the external LED equipment and used for receiving input data signals and outputting signals to control the LED equipment, wherein the enabling signals close or open the output of the display driving module.
The signal detection module is used for detecting the frequency or the duration level time width of an input data signal and outputting an enable signal according to the frequency or the duration level time width.
As an embodiment of the above driving circuit, a specific schematic diagram is shown in fig. 2, and a signal detection module, an LED driving port enabling module and a display driving module are integrated.
Specifically, the signal detection module is used for detecting the frequency or the duration time width of the data signal input by the driving chip; namely: when the frequency or the duration time width of the continuous level exceeds a preset threshold value, the enabling signal closes the output of the display driving module, otherwise, the output of the display driving module is opened.
In the present invention, the predetermined threshold value may be a fixed threshold a, b or an interval [ a, b ], since the signal frequency and the flat level time are in an inverse relationship, for example:
when the frequency is less than a or the duration time width of the continuous level is more than 1/a, the enabling signal closes the output of the display driving module, otherwise, the output of the display driving module is opened;
when the frequency is greater than b or the duration time width of the continuous level is less than 1/b, the enabling signal closes the output of the display driving module, otherwise, the output of the display driving module is opened; in the alternative to this, either,
when the frequency is between a and b or the duration of the level is between 1/b and 1/a, the enable signal turns on the output of the display driving module, and when the frequency exceeds the threshold, the output of the display driving module is turned off.
The appropriate threshold value can be selected according to specific situations and the condition of opening or closing the display driving module can be judged.
Fig. 3 is a specific schematic diagram of another embodiment of the above-mentioned driving circuit, which is a functional schematic diagram of another driving circuit provided by an embodiment of the present invention, and the signal detection module and the display driving module are integrated.
For example, the frequency of the data signal is greater than or equal to a set value or the duration time width of the data signal is less than or equal to a set value, the enable signal retains information on a display data storage module in the display driving module, and the output of the display driving module is started. Otherwise, the enabling signal clears the information on the display data storage module in the display driving module and closes the output of the display driving module.
Further, the signal detection module comprises a signal sampling module, a reset circuit module, an oscillator, a timing circuit module and an output signal sampling module.
The signal sampling module is used for receiving an input data signal, and inputting the input data signal into the reset circuit module when an effective clock edge of the input data signal enters.
The reset circuit module is used for receiving the input of the signal sampling module and resetting the oscillator and the timing circuit module.
The oscillator and the timing circuit module are used for counting after resetting and judging the frequency or the duration of the input data signal.
The output signal sampling module is used for comparing the frequency or continuous level time width value obtained by the oscillator and the timing circuit module with a preset threshold value and outputting an enabling signal.
As an embodiment of the present invention, as shown in fig. 4, the signal detection module includes an input signal sampling module, a reset circuit module, an oscillator, a timing circuit module, an output signal sampling module, and the like. When a data signal effective edge arrives, the signal is sent to a signal sampling module for sampling, the sampled signal firstly resets an oscillator and a timing circuit module, then the oscillator and the timing circuit module start to work, so that whether the period of an input signal is greater than the timing of the timing circuit or not is judged, if so, the output of the timing module is maintained at a fixed level, and an output signal sampling module is maintained at logic '0' (or logic '1'); if the output of the timing module is less than or equal to the timing time, the output of the timing module is maintained as a pulse signal, and the output signal sampling module is maintained as logic 1 (or logic 0). The logic output of the output signal sampling module depends on the enabling requirement of the used enabling module, and the function matching between the two modules can be reasonably and practically realized.
The enabling module is used for receiving the enabling signal input by the signal detection module and closing or opening the output of the display driving module.
For example, when the frequency obtained by the oscillator and the timing circuit module is greater than or equal to a predetermined threshold value or the time width value obtained by the duration level module is less than or equal to the predetermined threshold value, the output signal sampling module controls the enabling module to start the output of the display driving module; otherwise, the output signal sampling module controls the enabling module to close the output of the display driving module.
As an embodiment of the present invention, as shown in fig. 5, for the schematic diagram of the LED driving port enabling module, corresponding to the embodiment of the frequency or duration time width detecting module, when the frequency of the detected signal is higher than or equal to the set value or the duration time width is less than or equal to the set value, the output is logic "1"; when the output value is lower than the set value, the output is logic '0', so the enabling module adopts an AND gate mode. If the enable signal is a logic "1", then the output is enabled; otherwise, the output is closed.
The display driving module is used for receiving input data signals, and the output signals control the LED equipment through the enabling module.
For further explanation of the present invention, the following description will be made with reference to specific circuits.
As shown in the circuit system of FIG. 6, the circuit includes an eight-bit shift register, an eight-bit memory, an output driving tri-state control circuit, and an input designed with SMIT buffer circuit. The shift register shifts bits when the shift clock rises and the memory stores when the store clock rises. The shift registers of the circuit are triggered to shift by adopting the rising edge, and the memories are triggered to store by adopting the rising edge. The shift register is reset to "0" when the reset signal is "0". The 3-state output is output forbidding when the control signal is in high level, and output permission when the control signal is in low level.
Fig. 7 is a circuit implementation of a frequency detection module. When the input signal has a rising edge, the output RS correspondingly generates a pulse of 60ns, the pulse is used for clearing the flip-flop ff1, and the CLK signal provides a trigger signal for the output sampling flip-flop ff2, so that the CLK signal and the RS signal have a delay of 20ns to avoid the risk competition of the output sampling circuit.
When the RS signal end receives an effective pulse signal, the counter starts working, the circuit starts timing, when a second RS pulse signal is not received in the timing process, the output Q1 end of the timing circuit outputs a negative pulse signal with the pulse width being the timing time width of the counter, the pulse width is equivalent to the time of one charge and discharge of the capacitor C, then the counter is closed, and the capacitor is cleared.
Negative pulse width: <math><mrow>
<msub>
<mi>T</mi>
<mi>c</mi>
</msub>
<mo>=</mo>
<mn>2</mn>
<mo>*</mo>
<mi>C</mi>
<mfrac>
<mi>ΔU</mi>
<mi>I</mi>
</mfrac>
</mrow></math>
wherein, Δ U is the difference between the highest and lowest voltages of the capacitor, and I is the output current of the constant current source.
If the time interval between two RS signal pulses at the input end is less than or equal to the timing time of the counter, the output negative pulses are overlapped, and the output level is continuously low. Otherwise, if the time interval of the two input RS pulse signals is greater than the timing time of the counter, the output is a series of negative pulses with the same frequency as the input signals and the pulse width of the negative pulses is the timing time of the counter.
The flip-flop ff2 samples the Q1 signal, and the flip-flop ff2 is set to "1" when the system is powered on, and the triggering time is controlled by the rising edge of the input signal, so when the Q1 is continuously low, the output Y is high level "1", and when the Q1 is negative pulse, the sampling flip-flop ff2 samples 20ns before the negative pulse, so the output Y is low level "0".
As can be seen from fig. 6, the output Y of the circuit is anded with the parallel output signal phase of the eight-bit memory, when the period of the input signal is equal to or less than the determined period Tc, the output Y is "1", the chip output is turned on, and when the period of the input signal is greater than the determined period Tc, the output Y is "0", and the chip output is turned off.
Therefore, on the basis of normal processing of the display signals, the interference signals are effectively shielded, the reliability is increased, and the system cost is reduced.
As shown in fig. 8, an embodiment of the present invention further provides a display control system. The display driving circuit comprises a main control device, a decoding driving unit and the display driving circuit.
Specifically, the display device comprises a main control device, a decoding driving unit and a display driving circuit,
the main control device is used for controlling the decoding driving unit, selecting the corresponding LED equipment for display, and transmitting the input data signal to the display driving circuit.
The decoding driving unit is used for selecting corresponding LED equipment according to the control signal of the main control device.
The display driving circuit is used for controlling the display output of the LED equipment selected by the decoding driving unit according to the input data signal and comprises a signal detection module and a display driving module.
The signal detection module is used for receiving input data signals, detecting input data signal output enable signals, and connecting the enable signals with the output of the display driving module.
The signal detection module comprises a signal sampling module, a reset circuit module, an oscillator and timing circuit module and an output signal sampling module,
the signal sampling module is connected with the reset circuit module and the oscillator and timing circuit module, receives an input data signal, and inputs the input data signal into the reset circuit module when an effective clock edge of the input data signal enters;
the reset circuit module is connected with the oscillator and the timing circuit module, receives the input of the signal sampling module and resets the oscillator and the timing circuit module;
the oscillator and the timing circuit module are reset and then count, and the frequency or the duration level time width of the input data signal is judged;
the output signal sampling module is connected with the oscillator and the timing circuit module, compares the frequency or the duration level time width obtained by the oscillator and the timing circuit module with a preset threshold value, and outputs an enabling signal.
The display driving module is connected with the external LED equipment and used for receiving input data signals and outputting signals to control the LED equipment, wherein the enabling signals close or open the output of the display driving module.
For example, when the frequency or duration time width obtained by the oscillator and the timing circuit module exceeds a predetermined threshold, the enable signal turns off the output of the display driving module, otherwise, the output of the display driving module is turned on.
In the present invention, the predetermined threshold value may be a fixed threshold a, b or an interval [ a, b ], since the signal frequency and the flat level time are in an inverse relationship, for example:
when the frequency is less than a or the duration time width of the continuous level is more than 1/a, the enabling signal closes the output of the display driving module, otherwise, the output of the display driving module is opened;
when the frequency is greater than b or the duration time width of the continuous level is less than 1/b, the enabling signal closes the output of the display driving module, otherwise, the output of the display driving module is opened; in the alternative to this, either,
when the frequency is between a and b or the duration of the level is between 1/b and 1/a, the enable signal turns on the output of the display driving module, and when the frequency exceeds the threshold, the output of the display driving module is turned off.
The appropriate threshold value can be selected according to specific situations and the condition of opening or closing the display driving module can be judged.
The display control system further comprises an enabling module, wherein the output of the display driving module passes through the enabling module and then outputs and controls the LED equipment, and the enabling signal controls the enabling module to close or open the output of the display driving module; or,
the enabling signal is connected with a display data storage module in the display driving module, and the enabling signal clears or retains information on the display data storage module to realize the closing or opening of the output of the display driving module.
According to the actual use environment, all input ports of the common LED display driving chip can be used as the input ends of the signal detection module.
As shown in fig. 8, the system controls the rows of the LED lamp arrays through the decoding driving unit, controls the columns of the LED lamp arrays through the LED display driving chip, and integrates the signal detection circuit inside the LED display driving chip on the premise that no peripheral component is added to the system, so that the LED lamp arrays can be effectively turned off in time under the condition that the control signal generated by the main control device is suddenly turned off, the system is protected, and the long-time large-current conduction of the LED lamp arrays is avoided, and the driving chip and the LED lamps are prevented from being burned down.
The utility model provides an above-mentioned equipment, with signal detection function integrated to LED show driver chip in to improved LED and shown driver chip's reliability, avoided signal interference to lead to driver chip and LED lamp life to reduce, reduced the device phenomenon of burning out. In addition, in practical application, under the condition that the system of designing according to current scheme does not do any change, can directly use the technical scheme of the utility model, it is compatible with ordinary LED display driver chip, like this under the compatible prerequisite of assurance system, the reliability obtains bigger promotion. The utility model provides an above-mentioned scheme, the realization scheme is simple, high-efficient.
It will be understood by those skilled in the art that all or part of the modules carried by the above embodiments may be implemented by hardware that is related to instructions of a program, which may be stored in a computer-readable storage medium, and when the program is executed, the program includes one or a combination of the modules of the embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
The foregoing is only an embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A display control circuit with signal monitoring function is characterized in that the display control circuit comprises a signal detection module and a display driving module,
the signal detection module is used for receiving an input data signal and detecting an input data signal output enable signal, and the enable signal is connected with the output of the display driving module;
the display driving module is connected with an external LED device and used for receiving the input data signal and outputting a signal to control the LED device, wherein the enabling signal turns off or on the output of the display driving module.
2. The display control circuit with signal monitoring function of claim 1, wherein the signal detection module comprises a signal sampling module, a reset circuit module, an oscillator and timing circuit module, and an output signal sampling module,
the signal sampling module is connected with the reset circuit module, the oscillator and the timing circuit module, receives the input data signal, and inputs the input data signal into the reset circuit module when an effective clock edge of the input data signal enters;
the reset circuit module is connected with the oscillator and the timing circuit module, receives the input of the signal sampling module and resets the oscillator and the timing circuit module;
the oscillator and the timing circuit module are reset and then count, and the frequency or the duration level time width of the input data signal is judged;
the output signal sampling module is connected with the oscillator and the timing circuit module, compares the frequency or the duration level time width obtained by the oscillator and the timing circuit module with a preset threshold value, and outputs an enabling signal.
3. The display control circuit with signal monitoring function according to claim 2, wherein the output signal sampling module controls the enabling module to turn off the output of the display driving module when the frequency or duration time width obtained by the oscillator and timing circuit module exceeds the predetermined threshold value, and otherwise to turn on the output of the display driving module.
4. The display control circuit with signal monitoring function according to claim 3,
the LED display device further comprises an enabling module, the output of the display driving module passes through the enabling module and then is output to control the LED equipment, and the enabling signal controls the enabling module to close or open the output of the display driving module; or,
the enabling signal is connected with a display data storage module in the display driving module, and the enabling signal clears or retains information on the display data storage module to realize closing or opening of the output of the display driving module.
5. A display control system with signal monitoring function is characterized in that the display control system comprises a main control device, a decoding driving unit and a display driving circuit,
the main control device is used for controlling the decoding driving unit, selecting corresponding LED equipment for display, and transmitting an input data signal to the display driving circuit;
the decoding driving unit is used for selecting corresponding LED equipment according to the control signal of the main control device;
the display driving circuit is used for controlling the display output of the LED equipment selected by the decoding driving unit according to an input data signal and comprises a signal detection module and a display driving module,
the signal detection module is used for receiving an input data signal and detecting an input data signal output enable signal, and the enable signal is connected with the output of the display driving module;
the display driving module is connected with an external LED device and used for receiving the input data signal and outputting a signal to control the LED device, wherein the enabling signal turns off or on the output of the display driving module.
6. The display control system with signal monitoring function of claim 5, wherein the signal detection module comprises a signal sampling module, a reset circuit module, an oscillator and timing circuit module, and an output signal sampling module,
the signal sampling module is connected with the reset circuit module, the oscillator and the timing circuit module, receives the input data signal, and inputs the input data signal into the reset circuit module when an effective clock edge of the input data signal enters;
the reset circuit module is connected with the oscillator and the timing circuit module, receives the input of the signal sampling module and resets the oscillator and the timing circuit module;
the oscillator and the timing circuit module are reset and then count, and the frequency or the duration level time width of the input data signal is judged;
the output signal sampling module is connected with the oscillator and the timing circuit module, compares the frequency or the duration level time width obtained by the oscillator and the timing circuit module with a preset threshold value, and outputs an enabling signal.
7. The display control system with signal monitoring function according to claim 6, wherein the output signal sampling module controls the enabling module to turn off the output of the display driving module when the duration or the frequency obtained by the oscillator and timing circuit module exceeds the predetermined threshold, and otherwise to turn on the output of the display driving module.
8. The display control system with signal monitoring function of claim 7,
the LED display device further comprises an enabling module, the output of the display driving module passes through the enabling module and then is output to control the LED equipment, and the enabling signal controls the enabling module to close or open the output of the display driving module; or,
the enabling signal is connected with a display data storage module in the display driving module, and the enabling signal clears or retains information on the display data storage module to realize closing or opening of the output of the display driving module.
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| CN2011201953410U CN202189535U (en) | 2011-06-10 | 2011-06-10 | Display and control circuit and display and control device with signal monitoring function |
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| CN2011201953410U CN202189535U (en) | 2011-06-10 | 2011-06-10 | Display and control circuit and display and control device with signal monitoring function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820002A (en) * | 2011-06-10 | 2012-12-12 | 深圳市明微电子股份有限公司 | Display drive method, display drive circuit and display control system |
| CN111261099A (en) * | 2020-03-31 | 2020-06-09 | 四川遂宁市利普芯微电子有限公司 | Communication protocol of binary decoding line driving chip of LED display screen |
| CN115862509A (en) * | 2022-11-29 | 2023-03-28 | 厦门天马微电子有限公司 | Display panel, driving method of display panel and display device |
-
2011
- 2011-06-10 CN CN2011201953410U patent/CN202189535U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820002A (en) * | 2011-06-10 | 2012-12-12 | 深圳市明微电子股份有限公司 | Display drive method, display drive circuit and display control system |
| CN102820002B (en) * | 2011-06-10 | 2015-10-14 | 深圳市明微电子股份有限公司 | Display drive method, display driver circuit and system thereof |
| CN111261099A (en) * | 2020-03-31 | 2020-06-09 | 四川遂宁市利普芯微电子有限公司 | Communication protocol of binary decoding line driving chip of LED display screen |
| CN115862509A (en) * | 2022-11-29 | 2023-03-28 | 厦门天马微电子有限公司 | Display panel, driving method of display panel and display device |
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Granted publication date: 20120411 |