CN213583057U - Display driving chip and LED display panel - Google Patents
Display driving chip and LED display panel Download PDFInfo
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- CN213583057U CN213583057U CN202022473829.7U CN202022473829U CN213583057U CN 213583057 U CN213583057 U CN 213583057U CN 202022473829 U CN202022473829 U CN 202022473829U CN 213583057 U CN213583057 U CN 213583057U
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Abstract
The embodiment of the utility model provides a display driver chip and LED display panel are related to, display driver chip includes: a control circuit; the driving circuit is used for driving the LED pixel array and comprises an output channel which is electrically connected with the control circuit; the monitoring circuit is electrically connected with the output channel of the driving circuit; the comparison circuit is electrically connected with the monitoring circuit and the control circuit; the utility model discloses still relate to a display panel. The embodiment of the utility model provides a through set up monitoring circuit and comparison circuit in showing driver chip, through monitoring circuit monitoring driver circuit's output, then obtain comparison result through comparison circuit, adjust drive circuit on sending control circuit again to realize LED operating condition's automatic monitoring and automatically regulated, reduce the LED screen and maintain the degree of difficulty and maintenance cost.
Description
Technical Field
The utility model relates to a display module rectifies technical field, especially relates to a display driver chip and a LED display panel.
Background
Along with the development of science and technology, the size of LED display screen is bigger and bigger, for the convenience of maintaining and managing the LED display screen, needs to increase the function of the operating condition monitoring of LED display screen on the LED display screen, so, just need to increase special monitoring chip and come to monitor the operating condition of LED display screen.
The monitoring chip is added on the LED display screen to monitor the working state of the LED display screen, and along with the increase of the state types to be monitored, a separate monitoring chip needs to be added for each monitoring type, so that the consumed hardware resources and the cost are increased.
SUMMERY OF THE UTILITY MODEL
Therefore, in order to overcome some of the defects and shortcomings of the prior art, embodiments of the present invention provide a display driving chip and an LED display panel.
On the one hand, the embodiment of the utility model provides a display driver chip who provides, include: a control circuit; the driving circuit is used for driving the LED pixel array and comprises an output channel which is electrically connected with the control circuit; the monitoring circuit is electrically connected with the output channel of the driving circuit; and the comparison circuit is electrically connected with the monitoring circuit and the control circuit.
In the prior art, because the operating condition of the LED display screen needs to be monitored, a monitoring chip needs to be added outside a display driving chip, the LED display screen is monitored in real time through the monitoring chip, and then the normal operating condition of the LED display screen is ensured through manual regulation according to the monitoring result. The embodiment of the utility model provides a through inside monitoring circuit, comparison circuit and the control circuit of being provided with of display driver chip, monitor the electric current, the voltage etc. of drive circuit output, then on sending to comparison circuit, then comparison circuit compares with the current-voltage of monitoring circuit output through the current-voltage threshold value that control circuit prestore, and exports the result extremely control circuit, then control circuit carries out automatically regulated to drive circuit according to the comparison result, guarantees the normal operating condition of LED display screen, realizes LED operating condition's automatic monitoring and automatically regulated, reduces the LED screen and maintains the degree of difficulty and maintenance cost.
In an embodiment of the present invention, the monitoring circuit includes: a plurality of monitoring sub-circuits electrically connected to the driving circuit, respectively; a monitoring selection circuit electrically connected to the plurality of monitoring sub-circuits, the comparison circuit and the control circuit; the display driving chip further comprises a monitoring threshold selection circuit, and the monitoring threshold selection circuit is electrically connected with the control circuit and the comparison circuit.
In an embodiment of the present invention, the number of the output channels is plural; the display driving chip further comprises a channel selection circuit, and the channel selection circuit is electrically connected with the plurality of output channels, the control circuit and the monitoring circuit.
In an embodiment of the present invention, the monitoring circuit includes: the first resistor is electrically connected with the output channel of the driving circuit; the second resistor is electrically connected with the first resistor; the first end of the first MOS tube is electrically connected between the first resistor and the second resistor; the comparison circuit comprises a comparator, wherein the comparator comprises a first input end, a second input end and an output end; the first input end is electrically connected with the second end of the first MOS tube, and the second input end and the output end are respectively and electrically connected with the control circuit.
In an embodiment of the present invention, the monitoring circuit further includes: and the third resistor is electrically connected between the second end of the first MOS tube and the first input end of the comparator.
In an embodiment of the present invention, the monitoring circuit includes a second MOS transistor, the second MOS transistor includes a drain and a source, the drain is electrically connected to the output channel of the driving circuit, and the source is electrically connected to the comparing circuit; the comparison circuit comprises a comparator, wherein the comparator comprises a first input end, a second input end and an output end; the first input end is electrically connected with the source electrode, and the second input end and the output end are respectively electrically connected with the control circuit.
In an embodiment of the present invention, the control circuit includes a register, and the register is electrically connected to the comparison circuit and the driving circuit.
In an embodiment of the present invention, the monitoring selection circuit includes a first multiplexer, an input terminal of the first multiplexer is electrically connected to the plurality of monitoring sub-circuits and the control circuit, respectively, and an output terminal of the first multiplexer is electrically connected to the comparison circuit.
On the other hand, the embodiment of the utility model provides a LED display panel, include: an array of LED pixels; and the display driving chip of any one of the preceding embodiments, wherein the output channel of the display driving chip is electrically connected to the LED pixel array.
In an embodiment of the present invention, the number of the display driving chips is plural; the LED display panel further comprises a master control circuit, and the master control circuit is electrically connected with the control circuit and the comparison circuit of each display driving chip in the plurality of display driving chips.
In view of the above, the above technical features of the present invention can have one or more of the following advantages:
1. the embodiment of the utility model provides a through be provided with monitoring circuit, comparison circuit and control circuit inside showing drive chip, monitor the current-voltage etc. of drive circuit output, then on sending to comparison circuit, then comparison circuit compares with the current-voltage of monitoring circuit output through the current-voltage threshold value that control circuit prestore, and export the result to control circuit, then control circuit carries out automatically regulated to drive circuit according to the comparison result, guarantees the normal operating condition of LED display screen, realizes LED operating condition's automatic monitoring and automatically regulated, reduces LED screen maintenance degree of difficulty and maintenance cost;
2. the utility model discloses a control circuit timesharing control channel selection circuit selects any output channel to monitor from a plurality of output channels, also can select the target monitoring subcircuit to monitor from a plurality of monitoring subcircuits through control circuit timesharing control monitoring selection circuit and reach the effect that a plurality of passageways timesharing were monitored to reduce system resource consumption;
3. the utility model discloses a monitoring threshold value selection circuit selects and corresponds the monitoring threshold value with the target monitoring sub-circuit to reach the effect that a plurality of monitoring circuit timesharing carried out the monitoring, select monitoring circuit to make the resource consumption that shows drive chip less through monitoring selection circuit, monitoring threshold value under multiple monitoring demand promptly.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a display driver chip according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of another display driver chip according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of another display driver chip according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of another display driver chip according to an embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of another display driver chip according to an embodiment of the present invention.
Fig. 6 is a schematic circuit diagram of a display driver chip according to an embodiment of the present invention.
Fig. 7 is a timing diagram illustrating a time-sharing operation of a plurality of monitoring sub-circuits of a plurality of channels according to an embodiment of the present invention.
Fig. 8 is a circuit connection diagram of a short circuit monitoring circuit according to an embodiment of the present invention.
Fig. 9 is a circuit connection diagram of an open circuit monitoring circuit according to an embodiment of the present invention.
Fig. 10 is a schematic diagram of a display panel according to an embodiment of the present invention.
Fig. 11 is a block diagram of a display panel according to an embodiment of the present invention.
Reference numerals:
10: a display driving circuit; 11: a control circuit; 12: a drive circuit; 13: a monitoring circuit; 14: a comparison circuit; 15: a monitoring threshold selection circuit; 16: a channel selection circuit; 111: a register; 121: a first output channel; 122: a second output channel; 123: a third output channel; 131: a first monitoring sub-circuit; 132: a second monitoring sub-circuit; 133: a third monitoring sub-circuit; 134: a monitor selection circuit; 141: a comparator; 1341: a first multiplexer; 151: a second multiplexer; 161: a third multiplexer; r1: a first resistor; r2: a second resistor; r3: a third resistor; m1: a first MOS transistor; m2: a second MOS transistor; d: a drain electrode; s: a source electrode; 30: an LED display panel; 31: an array of LED pixels; 32: a master control circuit; 321: a microcontroller.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 to fig. 3, an embodiment of the present invention provides a display driving chip 10, for example, including: a control circuit 11, a driving circuit 12 for driving the LED pixel array, a monitoring circuit 13, and a comparison circuit 14.
The driving circuit 12 includes an output channel, and the driving circuit 12 is electrically connected to the control circuit 11; the monitoring circuit 13 is electrically connected to the output channels of the driving circuit 12, and the output channels may include a plurality of, for example, a first output channel 121, a second output channel 122, and a third output channel 123, or even more, where the first output channel 121, the second output channel 122, and the third output channel 123 are used for outputting the current generated by the driving circuit 12 and outputting the generated current to the LED pixel array, so that the LED pixel array displays, thereby lighting the LED display screen. The monitoring circuit 13 is configured to monitor the current and the voltage output by the output channel of the driving circuit 12, and the monitoring circuit 13 may also be configured to monitor other output data according to actual needs, which is not limited herein.
The comparison circuit 14 is electrically connected to the monitoring circuit 13 and the control circuit 11, the comparison circuit 14 obtains threshold data stored in the control circuit 11, and then compares the threshold data with corresponding monitored output data of the monitoring circuit 13, for example, the monitoring circuit 13 monitors a current value output by the driving circuit 12, the comparison circuit 14 obtains a corresponding current threshold from the control circuit 11, and then compares the current threshold to obtain a comparison result, where the comparison result has multiple conditions, for example, the monitored data is greater than the obtained threshold data or the monitored data is equal to the obtained threshold data or the monitored data is less than the obtained threshold data.
The utility model provides a display driver chip 10's theory of operation for example is: the monitoring circuit 13 monitors a current value or a voltage value output by an output channel of the driving circuit 12, and inputs the monitored current value or the monitored voltage value into the comparison circuit 14, then the comparison circuit 14 obtains a current threshold value or a voltage threshold value stored in the control circuit 11 in advance, then the comparison circuit 14 compares the monitored current value or the monitored voltage value with the obtained current threshold value or the obtained voltage threshold value to obtain a comparison result, and sends the comparison result to the control circuit 11, and the control circuit 11 automatically adjusts the driving circuit 12 according to the received comparison result, for example, changes the current of the driving circuit 12 or changes the voltage of the driving circuit 12 or controls the on-off of the output channel of the driving circuit 12, and the like, so as to ensure the normal working state of the LED display screen.
In the prior art, because the operating condition of the LED display screen needs to be monitored, a monitoring chip needs to be added outside a display driving chip, the LED display screen is monitored in real time through the monitoring chip, and then the normal operating condition of the LED display screen is ensured through manual regulation according to the monitoring result. The embodiment of the utility model provides a through show that driver chip 10 is inside to be provided with monitoring circuit 13, comparison circuit 14 and control circuit 11, monitor current, voltage etc. of drive circuit 12 output, then send to comparison circuit 14 on, then comparison circuit 14 compares with the current-voltage of monitoring circuit 13 output through the current-voltage threshold value that control circuit 11 prestore, and with the result output extremely control circuit 11, then control circuit 11 carries out automatically regulated to drive circuit 12 according to the comparison result, guarantees the normal operating condition of LED display screen, realizes LED operating condition's automatic monitoring and automatically regulated, reduces the LED screen and maintains the degree of difficulty and maintenance cost.
As shown in fig. 2, the control circuit 11 includes: a register 111 and a circuit logic for responding to a command, the register 111 electrically connects the comparison circuit 14 and the driving circuit 12, and the register 111 is used for buffering data, such as a current threshold or a voltage threshold sent by upper computer software, or a configuration of some working states sent by a receiving card, and the like. For example, after receiving the comparison result sent by the comparison circuit 14, the control circuit 11 performs comparison and determination on the comparison result according to the configuration stored in the register 111, and when the comparison result does not conform to the stored configuration, the register 111 triggers a corresponding adjustment action, and then controls the current or voltage of the driving circuit 12 to change. The register 111 is, for example, a configuration register.
As shown in fig. 8, the utility model discloses a monitoring circuit 13 is short circuit monitoring circuit, include: the circuit comprises a first resistor R1, a second resistor R2 and a first MOS transistor; the comparison circuit 14 comprises a comparator 141 comprising a first input, a second input and an output.
Wherein the first resistor R1 is electrically connected to the output channel of the driving circuit 12; the second resistor R2 is electrically connected with the first resistor R2; a first end of the first MOS transistor M1 is electrically connected between the first resistor R1 and the second resistor R2, a second end of the first MOS transistor is electrically connected to the first input end, and the second input end and the output end are respectively electrically connected to the control circuit 11.
The first end and the second end of the first MOS tube can be any end of the first MOS tube, namely the source electrode and the drain electrode of the first MOS tube are not distinguished. An output channel in the driving circuit 12 is connected to the short-circuit monitoring circuit, and is divided by the first resistor R1 and the second resistor R2, and then is connected to a first input terminal of the comparator 141 through the first MOS transistor M1. The second input terminal of the comparator 141 is electrically connected to the control circuit 11 for obtaining a short circuit monitoring reference value (i.e. a threshold value) stored by the control circuit 11. Then the comparison result output by the comparator 141 through the output terminal is the short circuit monitoring result. The first MOS transistor M1 is, for example, a switching MOS transistor. The comparator 141 may be a current comparator or a voltage comparator, such as LM339, LM393, or the like.
Wherein, the short circuit monitoring circuit monitors the current value or voltage value of the driving circuit 12, the voltage output by the driving circuit 12 is output to the first resistor R1 and the second resistor R2 through the output channel, the voltage is divided by the first resistor R1 and the second resistor R2 to obtain the divided voltage, the divided voltage is output to the comparator 141, then the comparator 141 compares the divided voltage with the short circuit monitoring reference value stored in the control circuit 11 to obtain the short circuit monitoring result and output to the control circuit 11, if the short circuit monitoring result is that the monitored current value or voltage value is higher than the short circuit monitoring reference value, the control circuit 11 obtains the short circuit of the driving circuit according to the short circuit detection result and changes the current value or voltage value of the driving circuit 12, if the short circuit monitoring result is that the monitored current value or voltage value is lower than the short circuit monitoring reference value, the control circuit 11 obtains the normal operation of the driving circuit according to the short circuit detection result; in addition, in this embodiment, the first MOS transistor M1 is used to protect the comparator 141, and when the divided voltage is too high to damage the comparator, the first MOS transistor M1 is turned off, so as to open the path between the comparator 141 and the driving circuit 12, thereby protecting the comparator 141.
Further, as shown in fig. 8, the monitoring circuit 13 further includes a third resistor R3 electrically connected between the second terminal of the first MOS transistor M1 and the first input terminal of the comparator 141. A third resistor R3 is added to the short circuit monitoring circuit for adding electrostatic protection to the short circuit monitoring circuit.
As shown in fig. 9, the monitoring circuit 13 of the embodiment of the present invention is an open circuit monitoring circuit, including: a second MOS transistor M2, wherein the second MOS transistor M2 comprises a drain D and a source S; the comparison circuit 14 comprises a comparator 141 comprising a first input, a second input and an output.
The drain D is electrically connected to the output channel of the driving circuit 12, the source S is electrically connected to the first input terminal of the comparator 141, and the second input terminal and the output terminal are electrically connected to the control circuit, respectively.
The open circuit monitoring circuit does not need resistance voltage division, but needs to add a second MOS transistor M2, which can prevent the high voltage of the output channel of the driving circuit 12 from damaging the internal monitoring circuit, at this time, the output channel of the driving circuit 12 is electrically connected to the drain D of the second MOS transistor M2, and the source S of the second MOS transistor M2 is electrically connected to the first input end of the comparator 141; the second input terminal of the comparator is electrically connected to the control circuit 11 for obtaining the open circuit monitoring reference value (i.e. threshold value) stored by the control circuit 11. The comparator 141 outputs the comparison result, which is the open circuit monitoring result, to the control circuit 11 through the output terminal. The second MOS transistor M2 is, for example, a protection switch MOS transistor.
As shown in fig. 3, 5 and 6, an embodiment of the present invention further provides a monitoring circuit 13, for example, including: a plurality of monitor sub-circuits, and a monitor select circuit 134.
In this embodiment, the plurality of monitoring sub-circuits include a first monitoring sub-circuit 131, a second monitoring sub-circuit 132, and a third monitoring sub-circuit 133, in other embodiments, the plurality of monitoring sub-circuits may further include a fourth monitoring sub-circuit or a fifth monitoring sub-circuit, and a plurality of monitoring sub-circuits with different functions may be set according to actual requirements, which is not limited herein. The first monitoring sub-circuit 131, the second monitoring sub-circuit 132 and the third monitoring sub-circuit 133 are respectively electrically connected to the output channel of the driving circuit 12, and the first monitoring sub-circuit 131, the second monitoring sub-circuit 132 and the third monitoring sub-circuit 133 respectively monitor different states of the output channel of the driving circuit 12, for example, the first monitoring sub-circuit 131 monitors the output current of the driving circuit 12, the second monitoring sub-circuit 132 monitors the output voltage of the driving circuit 12, and the third monitoring sub-circuit monitors the channel output duration of the driving circuit 12; that is, the monitoring functions of the first monitoring sub-circuit 131, the second monitoring sub-circuit 132 and the third monitoring sub-circuit 133 are all different. The monitoring selection circuit 134 includes a first multiplexer 1341, an input end of the first multiplexer 1341 is electrically connected to the first monitoring sub-circuit 131, the second monitoring sub-circuit 132, the third monitoring sub-circuit 133 and the control circuit 11, respectively, and an output end of the first multiplexer 1341 is electrically connected to the comparison circuit 14.
The display driving chip 10 further includes a monitoring threshold selection circuit 15, and the monitoring threshold selection circuit 15 is electrically connected to the control circuit 11 and the comparison circuit 14. The monitoring threshold selection circuit 15 includes a second multiplexer 151, an input terminal of the second multiplexer 151 is electrically connected to the control circuit 11, and an output terminal of the second multiplexer 151 is electrically connected to the comparison circuit 14.
The control circuit 11 issues a control signal to the first multiplexer 1341 of the monitoring selection circuit 134, the first multiplexer 1341 of the monitoring selection circuit 134 selects a target monitoring sub-circuit from the first monitoring sub-circuit 131, the second monitoring sub-circuit 132, and the third monitoring sub-circuit 133 according to the control signal, and the second multiplexer 151 of the monitoring threshold selection circuit 15 selects a monitoring threshold corresponding to the target monitoring sub-circuit, for example, the first monitoring threshold, the second monitoring threshold, or the third monitoring threshold, according to the control signal and sends the selected monitoring threshold to the comparison circuit 14. For example, the control circuit 11 sends a signal to the monitoring selection circuit 134, then the first multiplexer 1341 of the monitoring selection circuit 134 selects the first monitoring sub-circuit 131, then the driving circuit 12 is monitored by the first monitoring sub-circuit 131, meanwhile, the second multiplexer 151 of the monitoring threshold selection circuit 15 selects a threshold corresponding to the first monitoring sub-circuit 131 from thresholds pre-stored in the control circuit 11, and then sends the threshold to the comparison circuit 14, and then the comparison circuit 14 compares data monitored by the first monitoring sub-circuit 131 with the threshold sent by the monitoring threshold selection circuit 15, obtains a comparison result, and sends the comparison result to the control circuit 11; then the control circuit 11 controls the first multiplexer 1341 of the monitoring selection circuit 134 to select the second monitoring sub-circuit 132, and repeats the above steps to sequentially monitor the plurality of monitoring sub-circuits in the monitoring circuit 13, and only one comparator is needed to complete the monitoring of different functions of the driving circuit, and simultaneously, the resources of the display driving chip are not occupied, so that the resource consumption of the display driving chip 10 is reduced.
As shown in fig. 4-6, the output channels include a first output channel 121, a second output channel 122, and a third output channel 123; the display driving chip 10 further includes a channel selection circuit 16, and the channel selection circuit 16 is electrically connected to the first output channel 121, the second output channel 122, the third output channel 123, the control circuit 11, and the monitoring circuit 13. The channel selection circuit 16 includes a third multiplexer 161, an input end of the third multiplexer 161 is electrically connected to the first output channel 121, the second output channel 122, the third output channel 123 and the control circuit 11, respectively, and an output end of the third multiplexer 161 is electrically connected to the monitoring circuit 14.
Further, as shown in fig. 6, the output terminal of the third multiplexer 161 is electrically connected to the first monitoring sub-circuit 131, the second monitoring sub-circuit 132 and the third monitoring sub-circuit 133, respectively.
The control circuit 11 controls the channel selection circuit 16 to select a target output channel from the first output channel 121, the second output channel 122 and the third output channel 123, and then the monitoring circuit 13 monitors the target output channel and sends the target output channel to the comparison circuit 14; for example, the control circuit 11 controls the third multiplexer 161 of the channel selection circuit 16 to select the first output channel 121, then the monitoring circuit 13 monitors the current value or the voltage value output by the first output channel 121, and the like, after the monitoring is completed, the control circuit controls the channel selection circuit 16 to select the second output channel 122, then the monitoring circuit 13 monitors the value output by the second output channel 122, and the control circuit 11 controls the third multiplexer 161 of the channel selection circuit 16 to sequentially monitor the first output channel 121, the second output channel 122, and the third output channel 123, so as to implement the time division multiplexing function of multiple output channels, and reduce the resource occupation of the display driving chip 10.
As shown in fig. 5-7, the embodiment of the present invention monitors a plurality of channels and a plurality of monitoring sub-circuits in a time-sharing manner, for example, as shown in fig. 6, the control circuit 11 first controls the third multiplexer 161 of the channel selection circuit 16 to select a target output channel, and then sequentially monitors different functions of the target output channel, for example, the first multiplexer 1341 sequentially selects the first monitoring sub-circuit 131, the second monitoring sub-circuit 132, and the third monitoring sub-circuit 133, and simultaneously the control circuit 11 also controls the second multiplexer 151 of the monitoring threshold selection circuit 15 to select the first monitoring sub-circuit 131, the second monitoring sub-circuit 132, and the third monitoring sub-circuit 133 corresponding first monitoring threshold, the second monitoring threshold, and the third monitoring threshold, and then sequentially compares the first monitoring threshold, the second monitoring threshold, and the third monitoring threshold in the comparator 141 of the comparison circuit 14, and then sends the comparison result to the control circuit 11, and the control circuit 11 automatically adjusts the driving circuit 12 according to the comparison result, so that the normal working state of the LED display screen is ensured. And the display driving chip 10 can be monitored by a plurality of monitoring sub-circuits and a plurality of channels in a time-sharing manner, so that the problem of large resource consumption of the display driving chip 10 of the driving circuit under the requirement of various monitoring is solved.
As shown in fig. 10, the embodiment of the present invention provides a display panel 30, including: an LED pixel array 31 and a display driver chip 10.
Wherein the LED pixel array 31 comprises 96 columns of pixels P, and each pixel P comprises a plurality of LEDs of different colors, such as R, G, B tricolor LED light points, so that the LED pixel array 31 has 96 columns of LED light points. The 96 rows of LED light points are electrically coupled to the 96 output channels DOUT 0-DOUT 95 of the display driver chip 10, respectively. The number of output channels of the display driver chip 10 of the present embodiment is not limited to 96, and may be other numbers, such as 64, and the specific number may be determined according to the actual application requirement.
In addition, the display driving chip 10 of the present embodiment receives the data clock signal DCLK, the serial data DIN, and the latch signal LE; the latch signal may also be other forms of signals, such as a chip select signal.
Further, as shown in fig. 11, the number of the display driving chips 10 is plural; the LED display panel 30 further includes a general control circuit 32, and the general control circuit 32 is electrically connected to the control circuit 11 and the comparison circuit 14 of each of the plurality of display driving chips.
The general control circuit 32 includes a microcontroller 321, and the microcontroller 321 is electrically connected to the control circuit 11 and the comparison circuit 14 of the display driving chip 10. The microcontroller 321 is, for example, GD32F 130.
The utility model provides a display panel 30's specific theory of operation for example is: the microcontroller 321 in the master control circuit 32 collects the comparison result of the comparison circuit 14 in each of the plurality of display driving chips connected to the microcontroller 321, and then sends an adjustment instruction to the control circuit 11 through the microcontroller, so that the control circuit 11 adjusts the output of the driving circuit 12 according to the adjustment instruction, for example, after the microcontroller 321 collects the display information of the whole LED pixel array 31, the whole display effect, the power switch, and the like of the LED pixel array 31 can be directly adjusted.
To sum up, the embodiment of the utility model provides a through inside monitoring circuit, comparison circuit and the control circuit of being provided with at display driver chip, monitor the current-voltage etc. of drive circuit output, then on sending to comparison circuit, then comparison circuit compares with the current-voltage of monitoring circuit output through the current-voltage threshold value that control circuit prestore, and with the result output extremely control circuit, then control circuit carries out automatically regulated to drive circuit according to the comparison result, guarantees the normal operating condition of LED display screen, realizes LED operating condition's automatic monitoring and automatically regulated, reduces the LED screen and maintains the degree of difficulty and maintenance cost. Meanwhile, the consumed hardware resources are greatly reduced through the time division multiplexing of the monitoring circuits by the output channels and the time division multiplexing of the comparison circuits by the monitoring circuits.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A display driver chip, comprising:
a control circuit;
the driving circuit is used for driving the LED pixel array, is electrically connected with the control circuit and comprises an output channel;
the monitoring circuit is electrically connected with the output channel of the driving circuit;
and the comparison circuit is electrically connected with the monitoring circuit and the control circuit.
2. The display driver chip of claim 1,
the monitoring circuit includes:
a plurality of monitoring sub-circuits electrically connected to the driving circuit, respectively;
a monitoring selection circuit electrically connected to the plurality of monitoring sub-circuits, the comparison circuit and the control circuit;
the display driving chip further comprises a monitoring threshold selection circuit, and the monitoring threshold selection circuit is electrically connected with the control circuit and the comparison circuit.
3. The display driver chip of claim 1, wherein the number of the output channels is plural; the display driving chip further comprises a channel selection circuit, and the channel selection circuit is electrically connected with the plurality of output channels, the control circuit and the monitoring circuit.
4. The display driver chip of claim 1,
the monitoring circuit includes:
the first resistor is electrically connected with the output channel of the driving circuit;
the second resistor is electrically connected with the first resistor; and
a first end of the first MOS tube is electrically connected between the first resistor and the second resistor;
the comparison circuit comprises a comparator, wherein the comparator comprises a first input end, a second input end and an output end; the first input end is electrically connected with the second end of the first MOS tube, and the second input end and the output end are respectively and electrically connected with the control circuit.
5. The display driver chip of claim 4, wherein the monitoring circuit further comprises:
and the third resistor is electrically connected between the second end of the first MOS tube and the first input end of the comparator.
6. The display driving chip according to claim 1, wherein the monitoring circuit comprises a second MOS transistor, the second MOS transistor comprises a drain and a source, the drain is electrically connected to the output channel of the driving circuit, and the source is electrically connected to the comparing circuit;
the comparison circuit comprises a comparator, wherein the comparator comprises a first input end, a second input end and an output end; the first input end is electrically connected with the source electrode, and the second input end and the output end are respectively electrically connected with the control circuit.
7. The display driver chip of claim 1, wherein the control circuit comprises a register, the register electrically connecting the comparison circuit and the driver circuit.
8. The display driver chip of claim 2, wherein the monitor selection circuit comprises a first multiplexer, an input terminal of the first multiplexer is electrically connected to the plurality of monitor sub-circuits and the control circuit, respectively, and an output terminal of the first multiplexer is electrically connected to the comparison circuit.
9. An LED display panel, comprising:
an array of LED pixels; and
the display driver chip of any of claims 1 to 7, the output channel of the display driver chip being electrically connected to the LED pixel array.
10. The LED display panel of claim 9, wherein the number of the display driving chips is plural; the LED display panel further comprises a master control circuit, and the master control circuit is electrically connected with the control circuit and the comparison circuit of each display driving chip in the plurality of display driving chips.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022473829.7U CN213583057U (en) | 2020-10-30 | 2020-10-30 | Display driving chip and LED display panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022473829.7U CN213583057U (en) | 2020-10-30 | 2020-10-30 | Display driving chip and LED display panel |
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| CN213583057U true CN213583057U (en) | 2021-06-29 |
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