CN107346651B - Display driving system and driving method thereof - Google Patents
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- CN107346651B CN107346651B CN201710831299.9A CN201710831299A CN107346651B CN 107346651 B CN107346651 B CN 107346651B CN 201710831299 A CN201710831299 A CN 201710831299A CN 107346651 B CN107346651 B CN 107346651B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- 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
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract
The invention discloses a display driving system and a driving method thereof, wherein the display driving system comprises: the driving circuit comprises a driving controller, a driving circuit and a line scanning signal monitoring circuit positioned between the driving controller and the driving circuit; the line scanning signal monitoring circuit is used for monitoring whether the line scanning signals provided by the driving controller to the driving circuit are normal or not in real time and feeding back a real-time monitoring result to the driving controller; and when receiving the real-time monitoring result of the abnormity of the line scanning signal, the driving controller provides the normal line scanning signal again. The line scanning signal monitoring circuit can monitor the line scanning signal provided by the driving controller in real time and feed back the real-time monitoring result to the driving controller; when the drive controller receives the real-time monitoring result of the abnormity of the line scanning signal, the normal line scanning signal is provided again, so that the fault signal is repaired in time, and the problem of abnormity of a display picture caused by the fault of the drive controller is solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display driving system and a driving method thereof.
Background
The existing display product includes a display driving system 101 and a display screen 102, and the display driving system 101 is mainly composed of two parts, namely a driving controller and a driving circuit, as shown in fig. 1. The driving controller is responsible for converting contents to be displayed into a format meeting the timing requirement of the driving circuit; the driving circuit selectively controls the brightness of each pixel point according to the driving signal provided by the driving controller, and realizes the display of a specific picture on the display screen 102.
Once some fault occurs in the driving controller, the driving circuit realizes image display according to the received fault signal, and display fault is caused. Taking the most common 1/8 scan panel as an example, the driving controller will output a 3-bit line scan signal H, which is decoded by the driving circuit to control the gating of 8 lines of pixels. If the resolution of the display screen is 240 × 320, when H is 3' b000, the 1 st, 9 th, … … th and 313 th lines are gated; row 2, row 10, … …, row 314 strobe when H is 3' b 001; row 3, row 11, … …, row 315 are strobed when H is 3' b 010; row 4, row 12, … …, row 316 are strobed when H is 3' b 011; row 5, row 13, … …, row 317, when H is 3' b 100; row 6, row 14, … …, row 318 strobe when H is 3' b 101; row 7, row 15, … …, row 319 are strobed when H is 3' b 110; row 8, row 16, … …, row 320 are strobed when H is 3' b 111. If the driving controller fails and the line scanning signal H is always 3' b000, the strobes of the 1 st, 9 th, … … th and 313 th lines are always in the strobing state, and if the failure cannot be eliminated in time, the display screen always only presents the contents of the 1 st, 9 th, … … th and 313 th lines of the displayed picture, and the contents of other lines cannot be displayed.
When the display screen is used for live broadcast of a large-scale sports event or outdoor advertising, the requirement on the real-time performance of picture display is high, and therefore once a display fault occurs, the display fault is required to be eliminated at the fastest speed. However, the driving circuit only passively receives various driving signals sent by the driving controller, such as clock signals, data signals, latch signals, and row scan control signals, and the driving circuit itself has no function of fault feedback, and it is not worth mentioning that active repair is performed after a fault is generated.
Disclosure of Invention
In view of this, embodiments of the present invention provide a display driving system and a driving method thereof, so as to solve the problem of abnormal display screen caused by a failure of a driving controller.
Therefore, an embodiment of the present invention provides a display driving system, including: the driving circuit comprises a driving controller and a driving circuit, and a line scanning signal monitoring circuit is positioned between the driving controller and the driving circuit;
the line scanning signal monitoring circuit is used for monitoring whether the line scanning signals provided by the driving controller to the driving circuit are normal or not in real time and feeding back a real-time monitoring result to the driving controller;
and when receiving the real-time monitoring result of the abnormity of the line scanning signal, the driving controller provides the normal line scanning signal again.
In a possible implementation manner, in the display driving system provided in an embodiment of the present invention, the line scanning signal monitoring circuit includes: 555 timer, resistance, first capacitor and second capacitor; wherein,
the 555 timer comprises a grounding pin, a trigger input pin, an output pin, a reset pin, a voltage control pin, a threshold value input pin, a discharging pin and a power supply pin;
two ends of the resistor are respectively connected with a first node and a second node, and the first node is connected with the anode of an external power supply through the third node;
one end of the first capacitor is connected with the second node, and the other end of the first capacitor is grounded through a fourth node;
one end of the second capacitor is connected with the voltage control pin, and the other end of the second capacitor is grounded;
the output pin and the threshold input pin are respectively connected with the driving controller, the threshold input pin is used for receiving a line scanning signal provided by the driving controller, and the output pin is used for feeding back a real-time monitoring result to the driving controller;
the grounding pin is grounded, the trigger input pin is grounded through the fourth node, the reset pin is connected with the first node, the discharge pin is connected with the second node, and the power supply pin is connected with the third node.
In a possible implementation manner, in the display driving system provided in an embodiment of the present invention, the line scanning signal monitoring circuit includes: 555 timer, resistance, first capacitor and second capacitor; wherein,
the 555 timer comprises a grounding pin, a trigger input pin, an output pin, a reset pin, a voltage control pin, a threshold value input pin, a discharging pin and a power supply pin;
two ends of the resistor are respectively connected with a first node and a second node, and the first node is connected with the anode of an external power supply through the third node;
one end of the first capacitor is connected with the second node, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with the voltage control pin, and the other end of the second capacitor is grounded;
the output pin and the trigger input pin are respectively connected with the driving controller, the trigger input pin is used for receiving a line scanning signal provided by the driving controller, and the output pin is used for feeding back a real-time monitoring result to the driving controller;
the grounding pin is grounded, the threshold input pin and the discharging pin are respectively connected with the second node through a fourth node, the reset pin is connected with the first node, and the power supply pin is connected with the third node.
The embodiment of the present invention further provides a driving method of the display driving system, including:
the line scanning signal monitoring circuit monitors whether line scanning signals provided by the driving circuit by the driving controller are normal in real time and feeds back a real-time monitoring result to the driving controller;
and when receiving the real-time monitoring result of the abnormity of the line scanning signal, the driving controller provides the normal line scanning signal again.
In a possible implementation manner, in the driving method provided in an embodiment of the present invention, the monitoring circuit of the line scanning signal monitors whether the line scanning signal provided by the driving controller to the driving circuit is normal in real time, and feeds back a real-time monitoring result to the driving controller, which specifically includes:
a threshold input pin of the 555 timer receives a line scanning signal provided by the driving controller to the driving circuit in real time;
and an output pin of the 555 timer feeds back a high level signal or a low level signal to the driving controller according to the line scanning signal received by the threshold input pin.
In a possible implementation manner, in the driving method provided in an embodiment of the present invention, the feeding back, by an output pin of the 555 timer according to the line scanning signal received by the threshold input pin, a high level signal or a low level signal to the driving controller specifically includes:
the output pin feeds back a high level signal to the driving controller when the threshold input pin receives a positive pulse line scanning signal; or,
and the output pin feeds back a low level signal to the driving controller when the time for receiving the low level or high level line scanning signal by the threshold input pin is more than half a pulse period.
In a possible implementation manner, in the foregoing driving method provided in an embodiment of the present invention, when receiving a real-time monitoring result of an abnormality of the line scanning signal, the driving controller resupplies a normal line scanning signal, which specifically includes:
and when the driving controller receives the low level signal fed back by the output pin, the driving controller provides the normal positive pulse line scanning signal again.
In a possible implementation manner, in the driving method provided in an embodiment of the present invention, the line scanning signal monitoring circuit monitors whether a line scanning signal provided by the driving controller to the driving circuit is abnormal in real time, and feeds back a real-time monitoring result to the driving controller, and specifically includes:
a trigger input pin of the 555 timer receives a line scanning signal provided by the driving controller to the driving circuit in real time;
and an output pin of the 555 timer feeds back a high level signal or a low level signal to the driving controller according to the row scanning signal received by the trigger input pin.
In a possible implementation manner, in the driving method provided in an embodiment of the present invention, the feeding back, by an output pin of the 555 timer, a high level signal or a low level signal to the driving controller according to the line scanning signal received by the trigger input pin specifically includes:
the output pin feeds back a high level signal to the driving controller when the trigger input pin receives a negative pulse line scanning signal; or,
and the output pin feeds back a low level signal to the driving controller when the time for receiving the low level or high level line scanning signal by the trigger input pin is more than a half pulse period.
In a possible implementation manner, in the foregoing driving method provided in an embodiment of the present invention, when receiving a real-time monitoring result of an abnormality of the line scanning signal, the driving controller resupplies a normal line scanning signal, which specifically includes:
and when the driving controller receives the low level signal fed back by the output pin, the driving controller provides the normal negative pulse line scanning signal again.
The invention has the following beneficial effects:
the display driving system and the driving method thereof provided by the embodiment of the invention comprise the following steps: the driving circuit comprises a driving controller, a driving circuit and a line scanning signal monitoring circuit positioned between the driving controller and the driving circuit; the line scanning signal monitoring circuit is used for monitoring whether the line scanning signals provided by the driving controller to the driving circuit are normal or not in real time and feeding back a real-time monitoring result to the driving controller; and when receiving the real-time monitoring result of the abnormity of the line scanning signal, the driving controller provides the normal line scanning signal again. The line scanning signal monitoring circuit can monitor the line scanning signal provided by the driving controller in real time and feed back the real-time monitoring result to the driving controller; when the drive controller receives the real-time monitoring result of the abnormity of the line scanning signal, the normal line scanning signal is provided again, so that the fault signal is repaired in time, and the problem of abnormity of a display picture caused by the fault of the drive controller is solved.
Drawings
FIG. 1 is a schematic diagram of a prior art display product;
fig. 2 is a schematic structural diagram of a display driving system according to an embodiment of the present invention;
FIG. 3 is a diagram of a 555 timer in the prior art;
fig. 4a and fig. 4b are schematic structural diagrams of a line scanning signal monitoring circuit according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a driving method of the display driving system shown in FIG. 2 according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a normal positive pulse line scan signal monitored in real time by the line scan signal monitoring circuit shown in FIG. 4a according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a normal negative pulse line scan signal monitored in real time by the line scan signal monitoring circuit shown in FIG. 4b according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a voltage signal at the first node a during a process of the line scanning signal monitoring circuit shown in fig. 4a and 4b monitoring a normal line scanning signal in real time according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a monitoring result fed back by the line scan signal monitoring circuit shown in fig. 4a and 4b in the process of monitoring a normal line scan signal in real time according to an embodiment of the present invention;
fig. 10 and fig. 11 are schematic diagrams of abnormal positive pulse line scanning signals monitored in real time by the line scanning signal monitoring circuit shown in fig. 4a according to an embodiment of the present invention;
fig. 12 and fig. 13 are schematic diagrams of abnormal negative pulse line scanning signals monitored in real time by the line scanning signal monitoring circuit shown in fig. 4b according to an embodiment of the present invention;
fig. 14 is a schematic diagram of a voltage signal at the first node a during a process of the line scanning signal monitoring circuit shown in fig. 4a and 4b monitoring an abnormal line scanning signal in real time according to an embodiment of the present invention;
fig. 15 is a schematic diagram of a monitoring result fed back by the line scan signal monitoring circuit shown in fig. 4a and 4b in the process of monitoring an abnormal line scan signal in real time according to an embodiment of the present invention.
Detailed Description
The following describes in detail a specific embodiment of a display driving system and a driving method thereof according to an embodiment of the present invention with reference to the accompanying drawings. It should be noted that the embodiments described herein are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The shapes and sizes of the various elements in the drawings are not intended to reflect the true scale of the display drive system, but are merely illustrative of the principles of the invention.
As shown in fig. 2, a display driving system according to an embodiment of the present invention includes: a drive controller 201 and a drive circuit 202, a row scanning signal monitoring circuit 203 located between the drive controller 201 and the drive circuit 202;
a line scanning signal monitoring circuit 203 for monitoring whether the line scanning signal provided by the driving circuit 202 by the driving controller 201 is normal in real time and feeding back the real-time monitoring result to the driving controller 201;
the driving controller 201 re-supplies the normal line scanning signal when receiving the real-time monitoring result of the line scanning signal abnormality.
In the display driving system provided in the embodiment of the present invention, the line scanning signal monitoring circuit 203 may monitor the line scanning signal provided by the driving controller 201 in real time, and may feed back a real-time monitoring result to the driving controller 201; when receiving the real-time monitoring result of the line scanning signal abnormality, the driving controller 201 will provide the normal line scanning signal again, so as to timely repair the fault signal, and solve the problem of the display image abnormality caused by the fault of the driving controller 201.
It should be noted that, in the display driving system provided in the embodiment of the present invention, the frequency of the real-time monitoring result fed back by the line scanning signal monitoring circuit 203 is determined by the refresh frequency of the display screen, and in specific implementation, the frequency of the real-time monitoring result fed back by the line scanning signal monitoring circuit 203 may be an integral multiple of the refresh frequency of the display screen.
The 555 timer is a medium-scale integrated device combining analog and digital functions, has the advantages of low cost, reliable performance and the like, and can realize pulse generation and conversion circuits of multivibrator, monostable trigger, Schmitt trigger and the like only by externally connecting a resistor and a capacitor.
As shown in fig. 3, the internal circuit of the 555 timer includes the following parts: a voltage divider composed of three resistors R with equal resistance, two voltage comparators C1 and C2, a synchronous RS trigger, an inverter and a discharge tube T. The function of which is mainly determined by two voltage comparators. The output voltages of the two voltage comparators control the state of the synchronous RS flip-flop and the discharge tube T. A voltage is applied between the power supply and the ground, and when the voltage control pin 5 is suspended, the voltage at the non-inverting input terminal of the voltage comparator C1 is 2Vcc/3, and the voltage at the inverting input terminal of the voltage comparator C2 is Vcc/3. If the voltage at the trigger input pin 2 is less than Vcc/3, the output of the voltage comparator C2 is 0, which sets the synchronous RS flip-flop to 1 and outputs 1 at the output pin 3. If the voltage on the threshold input pin 6 is greater than 2Vcc/3 and the voltage on the trigger input pin 2 is greater than Vcc/3, the output of the voltage comparator C1 is 0 and the output of the voltage comparator C2 is 1, which causes the synchronous RS flip-flop to be set to 0 and the output pin 3 to output 0.
In view of this, in a specific implementation, in the display driving system provided in the embodiment of the present invention, a line scanning signal detection circuit may be built based on a 555 timer; specifically, as shown in fig. 4a, the line scanning signal monitoring circuit 203 may include: 555 timer, resistor R, first capacitor C1 and second capacitor C2; wherein,
the 555 timer comprises a grounding pin 1, a trigger input pin 2, an output pin 3, a reset pin 4, a voltage control pin 5, a threshold value input pin 6, a discharging pin 7 and a power supply pin 8;
two ends of the resistor R are respectively connected with a first node a and a second node b, and the first node a is connected with the anode of an external power supply Vcc through a third node c;
one end of the first capacitor C1 is connected to the second node b, and the other end is grounded through the fourth node d;
one end of the second capacitor C2 is connected to the voltage control pin 5, and the other end is grounded, i.e. the voltage control pin 5 is idle, and interference is prevented from being introduced by connecting the second capacitor C2; typically, the capacitance of the second capacitor C2 is 0.01 μ F;
the output pin 3 and the threshold input pin 6 are respectively connected to the driving controller 201 (not shown in fig. 4 a), the threshold input pin 6 is used for receiving a line scanning signal provided by the driving controller 201, and the output pin 3 is used for feeding back a real-time monitoring result to the driving controller 201;
the grounding pin 1 is grounded, the trigger input pin 2 is grounded through a fourth node d, the reset pin 4 is connected with the first node a, the discharge pin 7 is connected with the second node b, and the power supply pin 8 is connected with the third node c.
Alternatively, as shown in fig. 4b, the line scanning signal monitoring circuit 203 includes: 555 timer, resistor R, first capacitor C1 and second capacitor C2; wherein,
the 555 timer comprises a grounding pin 1, a trigger input pin 2, an output pin 3, a reset pin 4, a voltage control pin 5, a threshold value input pin 6, a discharging pin 7 and a power supply pin 8;
two ends of the resistor R are respectively connected with a first node a and a second node b, and the first node a is connected with the anode of an external power supply Vcc through a third node c;
one end of the first capacitor C1 is connected to the second node b, and the other end is grounded;
one end of the second capacitor C2 is connected to the voltage control pin 5, and the other end is grounded, i.e. the voltage control pin 5 is idle, and interference is prevented from being introduced by connecting the second capacitor C2; typically, the capacitance of the second capacitor C2 is 0.01 μ F;
the output pin 3 and the trigger input pin 2 are respectively connected to the driving controller 201 (not shown in fig. 4 b), the trigger input pin 2 is configured to receive a line scanning signal provided by the driving controller 201, and the output pin 3 is configured to feed back a real-time monitoring result to the driving controller 201;
the ground pin 1 is grounded, the threshold input pin 6 and the discharge pin 7 are respectively connected with the second node b through a fourth node d, the reset pin 4 is connected with the first node a, and the power supply pin 8 is connected with the third node c.
Based on the same inventive concept, embodiments of the present invention further provide a driving method of the display driving system, and since a principle of the driving method for solving the problem is similar to a principle of the driving method for solving the problem, the implementation of the driving method provided by the embodiments of the present invention may refer to the implementation of the display driving system provided by the embodiments of the present invention, and repeated details are not repeated.
Specifically, as shown in fig. 5, the driving method of the display driving system according to the embodiment of the present invention may specifically include the following steps:
s501, the line scanning signal monitoring circuit monitors whether line scanning signals provided by the driving circuit by the driving controller are normal in real time and feeds back a real-time monitoring result to the driving controller;
s502, when the driving controller receives the real-time monitoring result of the line scanning signal abnormity, the driving controller provides the normal line scanning signal again.
In a specific implementation, in the driving method provided in the embodiment of the present invention, the step S501 is that the line scanning signal monitoring circuit monitors whether the line scanning signal provided by the driving controller to the driving circuit is normal in real time, and feeds back a real-time monitoring result to the driving controller, which may specifically be implemented through the following steps:
a threshold input pin of the 555 timer receives a line scanning signal provided by the driving controller to the driving circuit in real time;
an output pin of the 555 timer feeds back a high level signal or a low level signal to the driving controller according to the row scanning signal received by the threshold input pin.
Further, in the above driving method provided in the embodiment of the present invention, in a specific implementation manner of step S501, the feeding back, to the driving controller, a high level signal or a low level signal by an output pin of the 555 timer according to the line scanning signal received by the threshold input pin specifically includes:
the output pin feeds back a high level signal to the driving controller when the threshold input pin receives a positive pulse line scanning signal; or,
the output pin feeds back a low level signal to the driving controller when the time that the threshold input pin receives the low level or high level line scanning signal is more than half a pulse period.
In a specific implementation, in the driving method provided in the embodiment of the present invention, when the driving controller in step S502 receives a real-time monitoring result of the line scanning signal abnormality, the driving controller re-provides a normal line scanning signal, which may specifically be implemented by the following steps:
and when the driving controller receives the low level signal fed back by the output pin, the driving controller provides the normal positive pulse line scanning signal again.
In a specific implementation, in the driving method provided in the embodiment of the present invention, the line scanning signal monitoring circuit in step S501 monitors whether the line scanning signal provided by the driving controller to the driving circuit is abnormal in real time, and feeds back a real-time monitoring result to the driving controller, which may be implemented in the following manner:
a trigger input pin of the 555 timer receives a line scanning signal provided by the driving controller to the driving circuit in real time;
an output pin of the 555 timer feeds back a high level signal or a low level signal to the driving controller according to the row scanning signal received by the trigger input pin.
Further, in the above driving method provided in the embodiment of the present invention, in a specific implementation manner of step S501, the feeding back, by an output pin of the 555 timer, a high level signal or a low level signal to the driving controller according to the row scanning signal received by the trigger input pin specifically includes:
when the output pin triggers the input pin to receive the negative pulse line scanning signal, a high level signal is fed back to the driving controller; or,
and the output pin feeds back the low-level signal to the driving controller when the time for triggering the input pin to receive the low-level or high-level row scanning signal is more than half a pulse period.
In a specific implementation, in the driving method provided in the embodiment of the present invention, when the driving controller in step S502 receives a real-time monitoring result of the line scanning signal abnormality, the driving controller re-provides a normal line scanning signal, which may be specifically implemented in the following manner:
and when the driving controller receives the low level signal fed back by the output pin, the driving controller provides the normal negative pulse line scanning signal again.
In order to better understand the technical solution of the present invention, the above display driving system and the driving method thereof provided by the embodiments of the present invention are described in detail with two specific embodiments.
Example one
Fig. 4a shows a line scanning signal monitoring circuit according to an embodiment of the present invention, and in practical application, the threshold input pin 6 of the 555 timer receives a positive pulse line scanning signal provided by the driving controller, and the output pin 3 feeds back a real-time monitoring result to the driving controller.
Specifically, as shown in fig. 8 and 9, after the external power is turned on and before the normal positive pulse line scan signal as shown in fig. 6 is not applied, the capacitor C1 is charged, and the voltage V at the first node aaRises when VaWhen the voltage is 2Vcc/3, the synchronous RS trigger of the 555 timer outputs low level, the discharge tube T is conducted, the capacitor C1 discharges rapidly, and the voltage output by the output pin 3 of the 555 timer is VoAt this time, the 555 timer circuit is in a steady state. At t ═ t0At the moment, a threshold input pin 6 of the 555 timer receives a jumping positive pulse line scanning signal, and the voltage V of the positive pulse line scanning signalinJumps to greater than 2Vcc/3, i.e., the voltage at the threshold input pin 6 is greater than 2Vcc/3, and the voltage Va at the first node a is equal to Vcc, so the voltage V output by the output pin 3oTurning to high level, cutting off the discharge tube T, charging the capacitor C1, and increasing the voltage Va at the first node a according to an exponential law; at t ═ t1At the moment, the positive pulse line scanning signal disappears, and the voltage Va at the first node a drops; t-t before Va drops below Vcc/32At the moment, the voltage V of the positive pulse line scanning signalinPositive jump again, the voltage V output by the output pin 3oRemains at a high level. Wherein the value of the product R C1 of the resistance R and the first capacitance C1 is determined by t1 and t2, specifically R C1<(t2-t1)。
When the positive pulse line scanning signal is abnormalFor example, as shown in FIG. 10, the voltage V of the positive pulse line scanning signalinThe low level is always kept, and no jump occurs; or as shown in FIG. 11, the voltage V of the positive pulse line scanning signalinThe high level is always kept, and no jump occurs; the voltage Va at the first node a gradually decreases as shown in fig. 14 such that a delay time t elapseswThen, the voltage V output by the output pin 3oAutomatically turned to low level as shown in FIG. 15, and delayed by time twIs determined by the resistor R and the first capacitor C1.
As can be seen from the above description, in the process of outputting the positive pulse line scanning signal by the driving controller, when the low level output by the output pin 3 is received, it means that the positive pulse line scanning signal is abnormal, and the driving controller can solve the display fault in time only by providing the normal positive pulse line scanning signal again.
Example two
Fig. 4b shows a line scanning signal monitoring circuit according to the second embodiment of the present invention, and in practical application, the trigger input pin 2 of the 555 timer receives a positive pulse line scanning signal provided by the driving controller, and the output pin 3 feeds back a real-time monitoring result to the driving controller.
Specifically, as shown in fig. 8 and 9, after the external power is turned on and before the normal negative pulse line scan signal as shown in fig. 7 is not applied, the capacitor C1 is charged, and the voltage V at the first node aaRises when VaWhen the voltage is 2Vcc/3, the synchronous RS trigger of the 555 timer outputs low level, the discharge tube T is conducted, the capacitor C1 discharges rapidly, and the voltage output by the output pin 3 of the 555 timer is VoAt this time, the 555 timer circuit is in a steady state. At t ═ t0At the moment, a trigger input pin 2 of the 555 timer receives a jumping negative pulse line scanning signal, and the voltage V of the negative pulse line scanning signalinJump to less than Vcc/3, i.e. the voltage at the trigger input pin 2 is less than Vcc/3, the voltage Va at the first node a is 0, the voltage at the threshold input pin 6 is less than 2Vcc/3, so the voltage V output by the output pin 3 isoTurning to high level, the discharge tube T is cut off, the capacitor C1 is charged, the secondThe voltage Va at a node a rises exponentially; at t ═ t1At the moment, the negative pulse line scanning signal disappears, and the voltage Va at the first node a rises; t-t before Va rises above Vcc/32At the moment, the voltage V of the negative pulse line scanning signalinThe voltage V output by the output pin 3 is subjected to negative jump againoRemains at a high level. Wherein the value of the product R C1 of the resistance R and the first capacitance C1 is determined by t1 and t2, specifically R C1<(t2-t1)。
When an abnormality occurs in the negative pulse line scanning signal, for example, as shown in fig. 12, the voltage V of the negative pulse line scanning signalinThe high level is always kept, and no jump occurs; or as shown in FIG. 13, the voltage V of the negative pulse line scanning signalinThe low level is always kept, and no jump occurs; the voltage Va at the first node a gradually decreases as shown in fig. 14 such that a delay time t elapseswThen, the voltage V output by the output pin 3oAutomatically turned to low level as shown in FIG. 15, and delayed by time twIs determined by the resistor R and the first capacitor C1.
As can be seen from the above description, in the process of outputting the negative pulse line scanning signal by the driving controller, when the low level output by the output pin 3 is received, it means that the negative pulse line scanning signal is abnormal, and the driving controller can solve the display fault in time only by providing the normal negative pulse line scanning signal again.
The display driving system and the driving method thereof provided by the embodiment of the invention comprise the following steps: the driving circuit comprises a driving controller, a driving circuit and a line scanning signal monitoring circuit positioned between the driving controller and the driving circuit; the line scanning signal monitoring circuit is used for monitoring whether the line scanning signals provided by the driving controller to the driving circuit are normal or not in real time and feeding back a real-time monitoring result to the driving controller; and when receiving the real-time monitoring result of the abnormity of the line scanning signal, the driving controller provides the normal line scanning signal again. The line scanning signal monitoring circuit can monitor the line scanning signal provided by the driving controller in real time and feed back the real-time monitoring result to the driving controller; when the drive controller receives the real-time monitoring result of the abnormity of the line scanning signal, the normal line scanning signal is provided again, so that the fault signal is repaired in time, and the problem of abnormity of a display picture caused by the fault of the drive controller is solved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A display driving system comprising: drive controller and drive circuit, characterized by still includes: a line scanning signal monitoring circuit between the drive controller and the drive circuit;
the line scanning signal monitoring circuit is used for monitoring whether the line scanning signals provided by the driving controller to the driving circuit are normal or not in real time and feeding back a real-time monitoring result to the driving controller;
when receiving the real-time monitoring result of the abnormity of the line scanning signal, the driving controller provides the normal line scanning signal again;
the line scanning signal monitoring circuit includes: 555 timer, resistance, first capacitor and second capacitor;
the 555 timer comprises a grounding pin, a trigger input pin, an output pin, a reset pin, a voltage control pin, a threshold value input pin, a discharging pin and a power supply pin;
the two ends of the resistor are respectively connected with a first node and a second node, and the first node is connected with the anode of an external power supply through a third node;
one end of the first capacitor is connected with the second node, and the other end of the first capacitor is grounded through a fourth node;
one end of the second capacitor is connected with the voltage control pin, and the other end of the second capacitor is grounded;
the output pin and the threshold input pin are respectively connected with the driving controller, the threshold input pin is used for receiving a line scanning signal provided by the driving controller, and the output pin is used for feeding back a real-time monitoring result to the driving controller;
the grounding pin is grounded, the trigger input pin is grounded through the fourth node, the reset pin is connected with the first node, the discharge pin is connected with the second node, and the power supply pin is connected with the third node;
or two ends of the resistor are respectively connected with a first node and a second node, and the first node is connected with the anode of an external power supply through a third node;
one end of the first capacitor is connected with the second node, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with the voltage control pin, and the other end of the second capacitor is grounded;
the output pin and the trigger input pin are respectively connected with the driving controller, the trigger input pin is used for receiving a line scanning signal provided by the driving controller, and the output pin is used for feeding back a real-time monitoring result to the driving controller;
the grounding pin is grounded, the threshold input pin and the discharging pin are respectively connected with the second node through a fourth node, the reset pin is connected with the first node, and the power supply pin is connected with the third node.
2. A driving method of a display driving system according to claim 1, comprising:
the line scanning signal monitoring circuit monitors whether line scanning signals provided by the driving circuit by the driving controller are normal in real time and feeds back a real-time monitoring result to the driving controller;
when receiving the real-time monitoring result of the abnormity of the line scanning signal, the driving controller provides the normal line scanning signal again;
the line scanning signal monitoring circuit monitors whether the line scanning signal provided by the driving controller to the driving circuit is normal in real time and feeds back a real-time monitoring result to the driving controller, and the line scanning signal monitoring circuit specifically comprises:
a threshold input pin of the 555 timer receives a line scanning signal provided by the driving controller to the driving circuit in real time; an output pin of the 555 timer feeds back a high level signal or a low level signal to the driving controller according to the line scanning signal received by the threshold input pin; or, a trigger input pin of the 555 timer receives a line scanning signal provided by the driving controller to the driving circuit in real time; and an output pin of the 555 timer feeds back a high level signal or a low level signal to the driving controller according to the row scanning signal received by the trigger input pin.
3. The driving method according to claim 2, wherein the feeding back of the high level signal or the low level signal to the driving controller by the output pin of the 555 timer according to the row scanning signal received by the threshold input pin specifically comprises:
the output pin feeds back a high level signal to the driving controller when the threshold input pin receives a positive pulse line scanning signal; or,
and the output pin feeds back a low level signal to the driving controller when the time for receiving the low level or high level line scanning signal by the threshold input pin is more than half a pulse period.
4. The driving method according to claim 3, wherein the driving controller re-provides the normal line scan signal when receiving the real-time monitoring result of the line scan signal abnormality, specifically comprising:
and when the driving controller receives the low level signal fed back by the output pin, the driving controller provides the normal positive pulse line scanning signal again.
5. The driving method according to claim 2, wherein the feeding back a high level signal or a low level signal to the driving controller by the output pin of the 555 timer according to the row scanning signal received by the trigger input pin specifically comprises:
the output pin feeds back a high level signal to the driving controller when the trigger input pin receives a negative pulse line scanning signal; or,
and the output pin feeds back a low level signal to the driving controller when the time for receiving the low level or high level line scanning signal by the trigger input pin is more than a half pulse period.
6. The driving method according to claim 5, wherein the driving controller re-provides the normal line scan signal when receiving the real-time monitoring result of the line scan signal abnormality, specifically comprising:
and when the driving controller receives the low level signal fed back by the output pin, the driving controller provides the normal negative pulse line scanning signal again.
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| JPH10228261A (en) * | 1997-02-14 | 1998-08-25 | Sharp Corp | Led display unit driving circuit |
| KR101281667B1 (en) * | 2006-05-11 | 2013-07-03 | 엘지디스플레이 주식회사 | Soft fail processing circuit and method for liquid crystal display device |
| CN102708815B (en) * | 2011-12-14 | 2014-08-06 | 京东方科技集团股份有限公司 | Gate driving circuit and liquid crystal display device |
| CN105185346A (en) * | 2015-10-23 | 2015-12-23 | 京东方科技集团股份有限公司 | Display device |
| CN106971686A (en) * | 2017-05-25 | 2017-07-21 | 上海中航光电子有限公司 | Display device and its driving method |
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