CN109509449B - Current regulating circuit, driving circuit and display device - Google Patents
Current regulating circuit, driving circuit and display device Download PDFInfo
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- CN109509449B CN109509449B CN201811561442.8A CN201811561442A CN109509449B CN 109509449 B CN109509449 B CN 109509449B CN 201811561442 A CN201811561442 A CN 201811561442A CN 109509449 B CN109509449 B CN 109509449B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Abstract
The invention discloses a current regulating circuit, a driving circuit and a display device. The current follower circuit carries out current following on the current output current of the driving chip and outputs a first voltage signal corresponding to the current, the comparison circuit compares the first voltage signal with a preset reference voltage signal, when the first voltage signal is greater than or equal to the preset reference voltage signal, the control output setting circuit sets the gear of the output current of the driving chip to be a first gear, and when the first voltage signal is smaller than the preset reference voltage signal, the control output setting circuit sets the gear of the output current of the driving chip to be a second gear, so that the technical problem that the output capacity of the driving chip in the prior art is single is solved.
Description
Technical Field
The present invention relates to the field of power supply circuits, and in particular, to a current regulator circuit, a driving circuit, and a display device.
Background
A TFT-LCD (Thin Film Transistor Liquid Crystal Display) is one of the major types of flat panel displays, and has become an important Display platform in modern IT and video products. The main driving principle of the TFT-LCD is that a system main board connects an R/G/B compression signal, a control signal, and a power supply with a connection port (connector) on a PCB through a wire, and data is processed by a TCON (Timing Controller) IC on the PCB and then connected with a display area through an S-COF (Source-Chip on Film) and a G-COF (Gate-Chip on Film) on the PCB, so that the LCD obtains a required power supply and signal.
The output capability of the S-COF can be set through an external functional pin. When the S-COF has high output capacity, the output current capacity is strong, but the power consumption of the S-COF is increased; when the S-COF is low in output capacity, the output current capacity is weak, but the power consumption of the S-COF is low. In the prior art, the output capability of the S-COF is directly set to be high or low, but the requirements on the output capability of the S-COF are different due to different display screens of the panel.
Disclosure of Invention
The invention mainly aims to provide a current regulating circuit, and aims to solve the problem that the output capacity of a driving chip in the prior art is single.
In order to achieve the above object, the present invention provides a current regulating circuit, which includes a driving chip, an output setting circuit, a current follower circuit and a comparison circuit,
the current follower circuit is provided with a signal input end, a signal output end and a following signal output end, the signal input end of the current follower circuit is connected with the output end of the driving chip, and the following signal output end of the current follower circuit is connected with the comparison input end of the comparison circuit; the output end of the comparison circuit is connected with the controlled end of the output setting circuit, and the output end of the output setting circuit is connected with the controlled end of the driving chip;
the output setting circuit is set to set the output current of the driving chip to be a first gear or a second gear; the first gear is larger than the second gear;
the current following circuit is used for carrying out current following on the current output current of the driving chip and outputting a first voltage signal corresponding to the current;
the comparison circuit is arranged to compare the first voltage signal with a preset reference voltage signal, when the first voltage signal is greater than or equal to the preset reference voltage signal, the output setting circuit is controlled to set the gear of the output current of the driving chip to be a first gear, and when the first voltage signal is less than the preset reference voltage signal, the output setting circuit is controlled to set the gear of the output current of the driving chip to be a second gear.
Optionally, the driving chip is a source thin film driving chip.
Optionally, the output setting circuit includes a first switch tube and a first resistor, a first end of the first switch tube is connected to a first end of the first resistor, a connection node of the first switch tube and the first resistor is an output end of the output setting circuit, a second end of the first switch tube is grounded, a controlled end of the first switch tube is a controlled end of the output setting circuit, and a second end of the first resistor is connected to the first power supply.
Optionally, the first switch tube is an N-MOS tube.
Optionally, the current follower circuit includes a second resistor, a third resistor, and a current follower, the current follower includes a first terminal, a second terminal, a third terminal, and a fourth terminal, the first terminal of the second resistor is connected to the second power supply, and the second terminal of the second resistor is connected to the third terminal of the current follower; the first end of the current follower is a signal input end of the current follower circuit, the second end of the current follower is a signal output end of the current follower circuit, the fourth end of the current follower is connected with the first end of the third resistor, and a connection node of the current follower and the third resistor is a following signal output end of the current follower circuit; and the second end of the third resistor is grounded.
Optionally, the comparison circuit includes a comparator, a positive input end of the comparator is a comparison input end of the comparison circuit, an output end of the comparator is an output end of the comparison circuit, and a negative input end of the comparator is connected to the reference voltage circuit.
Optionally, the reference voltage circuit includes a voltage divider circuit or a reference voltage chip.
In order to achieve the above object, the present invention further provides a driving circuit, which includes a driving chip, an output setting circuit, a current follower circuit and a comparison circuit,
the current follower circuit is provided with a signal input end, a signal output end and a following signal output end, the signal input end of the current follower circuit is connected with the output end of the driving chip, and the following signal output end of the current follower circuit is connected with the comparison input end of the comparison circuit; the output end of the comparison circuit is connected with the controlled end of the output setting circuit, and the output end of the output setting circuit is connected with the controlled end of the driving chip;
the output setting circuit is set to set the output current of the driving chip to be a first gear or a second gear; the first gear is larger than the second gear;
the current following circuit is used for carrying out current following on the current output current of the driving chip and outputting a first voltage signal corresponding to the current;
the comparison circuit is configured to compare the first voltage signal with a preset reference voltage signal, and when the first voltage signal is greater than or equal to the preset reference voltage signal, the comparison circuit controls the output setting circuit to set the gear of the output current of the driving chip to be a first gear;
the current follower circuit comprises a second resistor, a third resistor and a current follower, the current follower comprises a first end, a second end, a third end and a fourth end, the first end of the second resistor is connected with a second power supply, and the second end of the second resistor is connected with the third end of the current follower; the first end of the current follower is a signal input end of the current follower circuit, the second end of the current follower is a signal output end of the current follower circuit, the fourth end of the current follower is connected with the first end of the third resistor, and a connection node of the current follower and the third resistor is a following signal output end of the current follower circuit; and the second end of the third resistor is grounded.
Optionally, the driving circuit is integrated on a chip.
In order to achieve the above object, the present invention further provides a display device including a display panel and the current follower circuit or the driving circuit as described above.
The invention provides a current regulating circuit, wherein a driving chip, an output setting circuit, a current follower circuit and a comparison circuit are arranged in the current regulating circuit, firstly, the output setting circuit sets the output current of the driving chip to be a first gear or a second gear, wherein the first gear is larger than the second gear. And then carrying out current following on the current output current of the driving chip through the current following circuit, and outputting a first voltage signal corresponding to the current. And finally, the comparison circuit compares the first voltage signal with a preset reference voltage signal, when the first voltage signal is greater than or equal to the preset reference voltage signal, the output setting circuit is controlled to set the gear of the output current of the driving chip to be a first gear, and when the first voltage signal is less than the preset reference voltage signal, the output setting circuit is controlled to set the gear of the output current of the driving chip to be a second gear. Therefore, the automatic adjustment output of various output currents of the driving chip is realized, automatic adjustment can be performed according to the output state, the power consumption of the driving chip is reduced, and the problem of single output capacity of the existing driving chip is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a current regulation circuit according to the present invention;
FIG. 2 is a circuit schematic of the current regulation circuit of the present invention;
fig. 3 is a block diagram of a driving circuit according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments 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.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a current regulating circuit which is used for solving the technical problem that the output of an existing driving chip is single.
In an embodiment of the present invention, as shown in fig. 1, the current adjusting circuit includes a driving chip 102, an Output setting circuit 101, a current follower circuit 103 and a comparison circuit 104, the current follower circuit 103 has a signal input terminal, a signal Output terminal Output and a following signal Output terminal, the signal input terminal of the current follower circuit 103 is connected to the Output terminal of the driving chip 102, the following signal Output terminal of the current follower circuit 103 is connected to the comparison input terminal of the comparison circuit 104, and the signal Output terminal Output of the current follower circuit 103 is connected to the device to be driven. The output end of the comparison circuit 104 is connected to the controlled end of the output setting circuit 101, and the output end of the output setting circuit 101 is connected to the controlled end of the driver chip 102.
In the above embodiment, the output setting circuit 101 sets the output current of the driver chip 102 to be the first gear or the second gear, where the first gear is greater than the second gear, the first gear corresponds to the high power output capability of the driver chip 102, and the second gear corresponds to the low power output capability of the driver chip 102. The current follower circuit 103 follows the current of the current output current of the driver chip 102 and outputs a first voltage signal corresponding to the current, and the variation trend of the first voltage signal is consistent with the variation trend of the current output current. The comparison circuit 104 compares the first voltage signal with a preset reference voltage signal Vref, controls the output setting circuit 101 to set the shift of the output current of the driver chip 102 to be a first shift when the first voltage signal is greater than or equal to the preset reference voltage signal Vref, and controls the output setting circuit 101 to set the shift of the output current of the driver chip 102 to be a second shift when the first voltage signal is less than the preset reference voltage signal Vref. At this moment, the output current of the driving chip 102 is detected, the change of the output current is converted into the change of the voltage, the converted voltage is compared with the preset reference voltage, and then a comparison result is output, so that the driving chip 102 outputs the set current gear, the output capacity of the driving chip 102 is adjusted according to actual needs, under the condition that the normal output of the driving chip 102 is ensured, the power consumption of a product is reduced, energy is saved, the added circuit complexity is lower, the realization is easy, the automatic adjustment capacity of the driving chip 102 is increased to the greatest extent, and the possibility of increasing the production cost is further increased.
Optionally, the output setting circuit 101 may further set the output current of the driver chip 102 to be a plurality of steps, and correspondingly increase the number of the comparison circuit 104 and the preset reference voltage signal Vref to determine the range of the output current, at this time, the output current of the driver chip 102 corresponds to different reference voltage ranges, then the comparison circuit 104 outputs the comparison result to the output setting circuit 101, and the output setting circuit 101 controls the driver chip 102 to output the corresponding preset steps, so as to realize adjustment of the output current of the plurality of steps of the driver chip 102, thereby better reducing the power consumption of the driver chip 102.
Optionally, the driving chip 102 is a source thin film driving chip S-COF.
In an embodiment, when the driving chip 102 is a source thin film driving chip S-COF (data driving chip 102, S-COF), compared to the existing source thin film driving chip S-COF, after the source thin film driving chip S-COF is added with an automatic adjustment capability, output currents of two or more stages can be output, so that while reasonable output is achieved, power consumption of the driving chip 102 is reduced, and the effect of reducing power consumption is more prominent compared to that of the driving chip 102 because the driving chip S-COF is disposed on the source thin film driving chip S-COF.
Optionally, as shown in fig. 2, the output setting circuit 101 includes a first switch Q1 and a first resistor R1, a first end of the first switch Q1 is connected to a first end of the first resistor R1, a connection node between the first switch Q1 and the first resistor R1 is an output end of the output setting circuit 101, a second end of the first switch Q1 is grounded, a controlled end of the first switch Q1 is a controlled end of the output setting circuit 101, and a second end of the first resistor R1 is connected to the first power source V1.
When the first switch Q1 is turned on, the output setting circuit 101 outputs a low level to the driver chip 102, and the driver chip 102 outputs a current of the first gear, that is, the driver chip 102 is in a high power output capability state. When the first switching tube Q1 is turned off, the output setting circuit 101 outputs a high level to the driving chip 102, and the driving chip 102 outputs a current of the second stage at this time, that is, the driving chip 102 is in a low power output capability state at this time. At this time, the output stage of the driver chip 102 is switched by switching the on and off states of the first switching tube Q1, thereby reducing the power consumption of the driver chip 102. Further, the first resistor R1 can appropriately stabilize and reduce the voltage output from the first power source V1, keeping the high level output from the output setting circuit 101 fluctuating within a certain range.
Optionally, the first switching tube Q1 is an N-MOS tube.
The first switch tube Q1 is an N-MOS tube, and when the level of the controlled end of the N-MOS tube is high, the N-MOS tube is turned on to output a low level. And when the level of the controlled end of the N-MOS tube is low, the N-MOS tube is switched off, and high level is output. Therefore, the switching of the control signal output to the driving chip 102 can be realized quickly, and the driving chip 102 switches the output gear. Thereby speeding up the speed of switching the output gear of the driver chip 102.
Optionally, the current follower circuit 103 includes a second resistor R2, a third resistor R3 and a current follower U1, the current follower U1 includes a first terminal 1, a second terminal 2, a third terminal 3 and a fourth terminal 4, the first terminal of the second resistor R2 is connected to the second power source V2, and the second terminal of the second resistor R2 is connected to the third terminal 3 of the current follower U1; a first end 1 of the current follower U1 is a signal input end of the current follower circuit 103, a second end 2 of the current follower U1 is a signal output end of the current follower circuit 103, a fourth end 4 of the current follower U1 is connected with a first end of a third resistor R3, and a connection node of the current follower U1 and a third resistor R3 is a following signal output end of the current follower circuit 103; the second terminal of the third resistor R3 is connected to ground.
Wherein the output current I is generated due to the existence of the self-path between the second power source V2 and the third terminal 3 and the fourth terminal 4 of the current follower U112Via the first terminal 1 and the second terminal 2 of the current follower U1, a path between the third terminal 3 and the fourth terminal 4 of the current follower U1 generates a follow current I34Wherein when the output current I12When rising, follows the current I34Also rises, the output current I12And follow current I34The relationship between is I12＝a*I34Wherein a is a constant value. The variation trend of the follow current can reflect the variation of the output current of the driver chip 102, and the follow current generates a first voltage signal (follow voltage signal) at the follow signal output terminal of the current follow circuit 103 through the voltage drop effect of the third resistor R3. Therefore, under the condition that the output of the driving chip 102 is not influenced, the change of the output current of the driving chip 102 can be collected and the following voltage signal can be output, the subsequent processing is convenient, and the electric isolation device has a good electric isolation effect.
Optionally, the comparator circuit 104 includes a comparator D1, a positive input terminal of the comparator D1 is a comparison input terminal of the comparator circuit 104, an output terminal of the comparator D1 is an output terminal of the comparator circuit 104, and an inverted input terminal of the comparator D1 is connected to the reference voltage circuit.
The first voltage signal (follow voltage signal) input from the positive input terminal of the comparator D1 is compared with the reference voltage signal Vref input from the negative input terminal of the comparator D1, and if the first voltage signal is greater than the reference voltage signal Vref, the output terminal of the comparator D1 outputs a high level, and if the first voltage signal is less than or equal to the reference voltage signal Vref, the output terminal of the comparator D1 outputs a low level. And judging the range of the first voltage signal, and determining the range of the follow current.
Alternatively, the reference voltage circuit includes a voltage dividing circuit or a reference voltage chip.
In an embodiment, the reference voltage circuit may be a power output terminal of any circuit outputting power, or may be a voltage divider circuit or a reference voltage chip. The voltage dividing circuit may be formed by a voltage dividing resistor. The reference voltage chip may be a general reference voltage chip. Thereby, power consumption of the reference voltage circuit can be saved.
The principle of the present invention is described in detail below with reference to fig. 1 and 2:
the existence of the self-path between the second power supply V2 and the third terminal 3 and the fourth terminal 4 of the current follower U1 at the output current I12Via the first terminal 1 and the second terminal 2 of the current follower U1, a follow current I is generated in a path between the third terminal 3 and the fourth terminal 4 of the current follower U134Wherein when the output current I12When rising, follows the current I34Also rises, the output current I12And follow current I34The relationship between is I12＝a*I34Wherein a is a constant value. The variation trend of the follow current can reflect the variation of the output current of the driver chip 102, the follow current generates a first voltage signal (follow voltage signal) at the follow signal output terminal of the current follow circuit 103 through the voltage drop effect of the third resistor R3, the first voltage signal (follow voltage signal) input at the forward input terminal of the comparator D1 and the reverse input terminal of the comparator D1And comparing the reference voltage signal Vref input by the terminal, if the first voltage signal is greater than the reference voltage signal Vref, outputting a high level to the N-MOS transistor by the output terminal of the comparator D1, turning on the N-MOS transistor, outputting a low level to the driver chip 102 by the N-MOS transistor, and outputting a current of a first gear by the driver chip 102, namely, the driver chip 102 is in a high power consumption output capacity state at the moment.
If the first voltage signal is less than or equal to the reference voltage signal Vref, the output end of the comparator D1 outputs a low level to the N-MOS transistor, the N-MOS transistor is turned off, the output setting circuit 101 outputs a high level to the driver chip 102, and the driver chip 102 outputs a current of the second gear, that is, the driver chip 102 is in a low power consumption output capability state. At this time, the output stage of the driver chip 102 is switched by switching the on and off states of the first switching tube Q1, thereby reducing the power consumption of the driver chip 102.
In order to achieve the above object, the present invention further provides a driving circuit, which includes a driving chip 102, an output setting circuit 101, a current follower circuit 103 and a comparison circuit 104, wherein the current follower circuit 103 has a signal input terminal, a signal output terminal and a following signal output terminal, the signal input terminal of the current follower circuit 103 is connected to the output terminal of the driving chip 102, and the signal output terminal of the current follower circuit 103 is connected to the comparison input terminal of the comparison circuit 104; the output end of the comparison circuit 104 is connected to the controlled end of the output setting circuit 101, and the output end of the output setting circuit 101 is connected to the controlled end of the driver chip 102. The current follower circuit 103 comprises a second resistor R2, a third resistor R3 and a current follower U1, the current follower U1 comprises a first end 1, a second end 2, a third end 3 and a fourth end 4, the first end of the second resistor R2 is connected with a second power supply V2, and the second end of the second resistor R2 is connected with the third end 3 of the current follower U1; a first end 1 of the current follower U1 is a signal input end of the current follower circuit 103, a second end 2 of the current follower U1 is a signal output end of the current follower circuit 103, a fourth end 4 of the current follower U1 is connected with a first end of a third resistor R3, and a connection node of the current follower U1 and a third resistor R3 is a following signal output end of the current follower circuit 103; the second terminal of the third resistor R3 is connected to ground.
The output setting circuit 101 sets the output current of the driver chip 102 to be a first gear or a second gear; the first gear is greater than the second gear. The current follower circuit 103 follows the current of the current output of the driver chip 102 and outputs a first voltage signal corresponding to the current. The comparison circuit 104 compares the first voltage signal with a preset reference voltage signal Vref, controls the output setting circuit 101 to set the shift of the output current of the driver chip 102 to be a first shift when the first voltage signal is greater than or equal to the preset reference voltage signal Vref, and controls the output setting circuit 101 to set the shift of the output current of the driver chip 102 to be a second shift when the first voltage signal is less than the preset reference voltage signal Vref.
It should be noted that, since the driving circuit of the present invention includes all embodiments of the current adjusting circuit, the driving circuit of the present invention has all the advantages of the current adjusting circuit, and thus, the description thereof is omitted.
Alternatively, the driving circuit is integrated on one chip.
The driving circuit is integrated on one chip, so that the production is convenient, the volume is saved, and the production efficiency is greatly improved.
Alternatively, as shown in fig. 3, the driving circuit of the display panel further includes a power management integrated circuit, a common electrode circuit, the gamma circuit and the scanning driving integrated circuit comprise a power supply management integrated circuit, wherein the power supply management integrated circuit comprises a first end, a second end and a third end, the first end of the power supply management integrated circuit is connected with the input end of the gamma circuit, the second end of the power supply management integrated circuit is connected with the input end of the public electrode circuit, the third end of the power supply management integrated circuit is connected with the input end of the scanning driving integrated circuit, the output end of the gamma circuit is connected with the input end of the current regulating circuit, the output end of the public electrode circuit is connected with the reference input end of the liquid crystal display panel alternating current drive, the output end of the source electrode driving chip is connected with the pixel electrode of the liquid crystal display panel, and the scanning driving integrated circuit is connected with a TFT (Thin Film Transistor) array of the.
Wherein the common electrodeCircuit (V)COMCircuit) provides a reference voltage for ac driving of liquid crystal in the display panel, and the Gamma circuit generates the reference voltage. The scanning driving integrated circuit (G-IC) is used for driving the liquid crystal molecules to rotate, and the specific circuit is implemented with reference to a driving circuit of a general liquid crystal display panel, and is not described herein again.
In order to achieve the above object, the present invention further provides a display device including a display panel and the current follower circuit or the driving circuit as described above.
In the above embodiments, the display panel includes, but is not limited to, a liquid crystal display panel, an organic light emitting diode display panel, a field emission display panel, a plasma display panel, a curved panel, and the liquid crystal panel includes a thin film transistor liquid crystal display panel, a TN panel, a VA panel, an IPS panel, and the like.
It should be noted that, since the display device of the present invention includes all embodiments of the current adjusting circuit or the driving circuit, the display device of the present invention has all the advantages of the current adjusting circuit or the driving circuit, and the details are not repeated herein.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A current regulating circuit is characterized in that the current regulating circuit comprises a driving chip, an output setting circuit, a current following circuit and a comparison circuit,
the current follower circuit is provided with a signal input end, a signal output end and a following signal output end, the signal input end of the current follower circuit is connected with the output end of the driving chip, and the following signal output end of the current follower circuit is connected with the comparison input end of the comparison circuit; the output end of the comparison circuit is connected with the controlled end of the output setting circuit, and the output end of the output setting circuit is connected with the controlled end of the driving chip;
the output setting circuit is set to set the output current of the driving chip to be a first gear or a second gear; the first gear is larger than the second gear;
the current following circuit is used for carrying out current following on the current output current of the driving chip and outputting a first voltage signal corresponding to the current;
the comparison circuit is configured to compare the first voltage signal with a preset reference voltage signal, and when the first voltage signal is greater than or equal to the preset reference voltage signal, the comparison circuit controls the output setting circuit to set the gear of the output current of the driving chip to be a first gear;
the driving chip is a source electrode film driving chip.
2. The current regulating circuit according to claim 1, wherein the output setting circuit comprises a first switch tube and a first resistor, a first end of the first switch tube is connected to a first end of the first resistor, a connection node of the first switch tube and the first resistor is an output end of the output setting circuit, a second end of the first switch tube is grounded, a controlled end of the first switch tube is a controlled end of the output setting circuit, and a second end of the first resistor is connected to the first power supply.
3. The current regulating circuit of claim 2, wherein the first switching transistor is an N-MOS transistor.
4. The current regulating circuit according to claim 1, wherein the current follower circuit comprises a second resistor, a third resistor and a current follower, the current follower comprises a first terminal, a second terminal, a third terminal and a fourth terminal, the first terminal of the second resistor is connected to a second power source, and the second terminal of the second resistor is connected to the third terminal of the current follower; the first end of the current follower is a signal input end of the current follower circuit, the second end of the current follower is a signal output end of the current follower circuit, the fourth end of the current follower is connected with the first end of the third resistor, and a connection node of the current follower and the third resistor is a following signal output end of the current follower circuit; and the second end of the third resistor is grounded.
5. The current regulating circuit according to any one of claims 1 to 4, wherein the comparator circuit comprises a comparator, a positive input terminal of the comparator is a comparison input terminal of the comparator circuit, an output terminal of the comparator is an output terminal of the comparator circuit, and a negative input terminal of the comparator circuit is connected to a reference voltage circuit.
6. The current regulation circuit of claim 5 wherein the reference voltage circuit comprises a voltage divider circuit or a reference voltage chip.
7. A drive circuit is characterized in that the drive circuit comprises a drive chip, an output setting circuit, a current follower circuit and a comparison circuit,
the current follower circuit is provided with a signal input end, a signal output end and a following signal output end, the signal input end of the current follower circuit is connected with the output end of the driving chip, and the following signal output end of the current follower circuit is connected with the comparison input end of the comparison circuit; the output end of the comparison circuit is connected with the controlled end of the output setting circuit, and the output end of the output setting circuit is connected with the controlled end of the driving chip;
the output setting circuit is set to set the output current of the driving chip to be a first gear or a second gear; the first gear is larger than the second gear;
the current following circuit is used for carrying out current following on the current output current of the driving chip and outputting a first voltage signal corresponding to the current;
the comparison circuit is configured to compare the first voltage signal with a preset reference voltage signal, and when the first voltage signal is greater than or equal to the preset reference voltage signal, the comparison circuit controls the output setting circuit to set the gear of the output current of the driving chip to be a first gear;
the current follower circuit comprises a second resistor, a third resistor and a current follower, the current follower comprises a first end, a second end, a third end and a fourth end, the first end of the second resistor is connected with a second power supply, and the second end of the second resistor is connected with the third end of the current follower; the first end of the current follower is a signal input end of the current follower circuit, the second end of the current follower is a signal output end of the current follower circuit, the fourth end of the current follower is connected with the first end of the third resistor, and a connection node of the current follower and the third resistor is a following signal output end of the current follower circuit; the second end of the third resistor is grounded;
the driving chip is a source electrode film driving chip.
8. A display device comprising a display panel and a current regulating circuit according to any one of claims 1 to 6 or a driving circuit according to claim 7.
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| CN201811561442.8A CN109509449B (en) | 2018-12-19 | 2018-12-19 | Current regulating circuit, driving circuit and display device |
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| CN201811561442.8A CN109509449B (en) | 2018-12-19 | 2018-12-19 | Current regulating circuit, driving circuit and display device |
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| CN109509449A CN109509449A (en) | 2019-03-22 |
| CN109509449B true CN109509449B (en) | 2021-07-06 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110176206B (en) * | 2019-05-06 | 2021-06-18 | 重庆惠科金渝光电科技有限公司 | Drive circuit, drive circuit connection information determination method, and display device |
| CN112927662B (en) * | 2021-03-09 | 2022-08-05 | 重庆惠科金渝光电科技有限公司 | Driving method and driving circuit of display panel |
| CN115188330B (en) * | 2022-09-13 | 2022-12-23 | 惠科股份有限公司 | Drive current adjusting circuit, color shift correction method, device, and storage medium |
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