CN114360456A - Drive circuit, light emitting diode drive chip, display panel and electronic equipment - Google Patents
Drive circuit, light emitting diode drive chip, display panel and electronic equipment Download PDFInfo
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- CN114360456A CN114360456A CN202210067122.7A CN202210067122A CN114360456A CN 114360456 A CN114360456 A CN 114360456A CN 202210067122 A CN202210067122 A CN 202210067122A CN 114360456 A CN114360456 A CN 114360456A
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- 239000004973 liquid crystal related substance Substances 0.000 claims description 2
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- 238000010586 diagram Methods 0.000 description 12
- 238000007599 discharging Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 2
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- 230000005669 field effect Effects 0.000 description 2
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
The present disclosure relates to a driving circuit, a light emitting diode driving chip, a display panel and an electronic device, wherein the driving circuit is used for driving at least one pixel unit, the driving circuit comprises a voltage reference unit and at least one voltage conversion unit, and the voltage reference unit is used for providing the same first reference voltage for each voltage conversion unit; the at least one voltage conversion unit is used for obtaining second reference voltages according to the first reference voltages and respectively supplying the second reference voltages to the at least one pixel unit so as to drive the at least one pixel unit. According to the driving circuit of the embodiment of the disclosure, at least one pixel unit can be driven simultaneously by providing the reference voltage with the same size, so that the current precision of each pixel unit in the at least one pixel unit is ensured, and when the light emitting device is arranged in the pixel unit, the display effect of the light emitting device can be ensured.
Description
Technical Field
The present disclosure relates to the field of display, and in particular, to a driving circuit, a light emitting diode driving chip, a display panel, and an electronic device.
Background
With the continuous development of science and technology, the living standard of people is continuously improved, and the display capability of electronic equipment is also improved accordingly. Some light emitting devices with display function, such as light emitting diodes, etc., are sensitive in their characteristics, so that if the current flowing through the light emitting devices is unstable during the application process, the operating state of the light emitting devices will change, which affects the display effect; when the current is too large, the circuit is also susceptible to irreversible damage. Accordingly, the electronic device is generally provided with a driving circuit to drive the light emitting device, so that a relatively stable current can flow in the light emitting device, and the light emitting device can be in a relatively stable operating state and is not damaged as much as possible.
However, when the driving circuit of the prior art drives the light emitting devices with multiple channels at the same time, the accuracy of the channel currents of different channels may be reduced, so that the display effect is not good.
Disclosure of Invention
In view of the above, the present disclosure provides a driving circuit, a light emitting diode driving chip, a display panel and an electronic device, in which the driving circuit according to the embodiments of the present disclosure can simultaneously drive at least one pixel unit by providing reference voltages of the same magnitude to ensure current accuracy of each pixel unit in the at least one pixel unit, and when a light emitting device is disposed in a pixel unit, a display effect of the light emitting device can be ensured.
According to an aspect of the present disclosure, there is provided a driving circuit for driving at least one pixel unit, the driving circuit including a voltage reference unit for providing a same first reference voltage for each voltage conversion unit, at least one voltage conversion unit; the at least one voltage conversion unit is used for obtaining second reference voltages according to the first reference voltages and respectively supplying the second reference voltages to at least one pixel unit so as to drive the at least one pixel unit; the power ground wire of the at least one pixel unit and the power ground wire of the voltage reference unit are respectively connected with the same power ground wire outside the driving circuit through connecting wires.
In a possible implementation manner, for any voltage conversion unit in the at least one voltage conversion unit, the voltage conversion unit includes a first charge storage unit, a second charge storage unit, a first switch group and a second switch group, and the first charge storage unit is connected to the voltage reference unit through the first switch group; the second charge storage unit is connected with the first charge storage unit through the second switch group, and the second charge storage unit is connected with one pixel unit.
In a possible implementation manner, the voltage conversion unit is further configured to receive a control signal, where the control signal causes the switch in the second switch group to be turned off or turned on when the switch in the first switch group is turned on or turned off.
In a possible implementation manner, the first switch group includes a first switch and a second switch, the second switch group includes a third switch and a fourth switch, a first end of the first switch is connected to the output end of the voltage reference unit, a second end of the first switch is connected to the first end of the first charge storage unit, a second end of the first charge storage unit is connected to the second end of the second switch, and a first end of the second switch is connected to the power ground of the voltage reference unit; a first terminal of the third switch is connected to a first terminal of the first charge storage unit, a second terminal of the third switch is connected to a first terminal of the second charge storage unit, a second terminal of the second charge storage unit is connected to a second terminal of the fourth switch, and a first terminal of the fourth switch is connected to a second terminal of the first charge storage unit; the first end of the second charge storage unit is also connected with the pixel unit, and the second end of the second charge storage unit is also connected with the power ground wire of the pixel unit.
In one possible implementation, one duty cycle of the driving circuit includes a first phase in which the first charge storage unit is charged by the first reference voltage, and a second phase; in the second phase, the first charge storage unit discharges to the second charge storage unit; wherein the control signal is different in level in the first phase and the second phase.
In a possible implementation manner, in a first phase of one working cycle of the driving circuit, under the control of the control signal, the first switch and the second switch are turned on, the third switch and the fourth switch are turned off, and the first reference voltage is output to the first charge storage unit to charge the first charge storage unit; in a second phase of one working cycle of the driving circuit, under the control of the control signal, the first switch and the second switch are turned off, the third switch and the fourth switch are turned on, the first charge storage unit discharges to the second charge storage unit, and the second charge storage unit outputs the second reference voltage at the first end.
In one possible implementation manner, the driving circuit is applied to a light emitting diode driving chip.
According to another aspect of the present disclosure, there is provided a light emitting diode driving chip, including the driving circuit described above, and a control circuit, the control circuit being connected to the voltage converting unit through a signal line, the control circuit being configured to output a control signal.
According to another aspect of the present disclosure, there is provided a display panel including the light emitting diode driving chip described above.
In a possible implementation manner, the display panel is one of a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, and an organic light emitting diode display panel.
According to another aspect of the present disclosure, there is provided an electronic apparatus including the display panel described above.
In one possible implementation, the electronic device includes a display, a smartphone, or a portable device.
According to the driving circuit of the embodiment of the disclosure, by arranging the voltage conversion unit between the voltage reference unit and each pixel unit, the first reference voltage output by the voltage reference unit is not directly output to the pixel unit, but is converted into the second reference voltage by the voltage conversion unit and then output to the pixel unit, so that the voltage drop generated when current flows on the connecting line of the pixel unit does not affect the voltage value of the second reference voltage, that is, the driving circuit can provide the reference voltages with the same size for driving at least one pixel unit at the same time. In this way, the current accuracy of each pixel unit in the at least one pixel unit can be ensured, and when the light emitting device is arranged in the pixel unit, the display effect of the light emitting device can be ensured.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 shows a schematic structure of a prior art driving circuit.
FIG. 2 illustrates an exemplary application scenario according to an embodiment of the present disclosure.
Fig. 3 illustrates an exemplary structural schematic diagram of a driving circuit according to an embodiment of the present disclosure.
Fig. 4 illustrates an exemplary structural diagram of the voltage converting unit 30 according to an embodiment of the present disclosure.
Fig. 5 illustrates an exemplary structural diagram of the voltage converting unit 30 according to an embodiment of the present disclosure.
Fig. 6 illustrates an equivalent circuit structure diagram of the voltage converting unit in the first stage according to an embodiment of the disclosure.
Fig. 7 illustrates an equivalent circuit structure diagram of the voltage converting unit in the second stage according to an embodiment of the disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Fig. 1 shows a schematic structure of a prior art driving circuit.
As shown in fig. 1, the related art driving circuit includes a voltage reference unit capable of generating a reference voltage having a voltage value Vref. The voltage reference unit is connected to a plurality of pixel units, and each pixel unit is provided with a light emitting device such as a Light Emitting Diode (LED), and the plurality of pixel units can be regarded as a plurality of display channels (CH1, CH2 … … CHX). When the prior art driving circuit is applied to a light emitting diode driving chip, several tens of channels are generally integrated. The anodes of the voltage reference units are respectively connected with the input ends (a1-ax) of the display channels, namely, the reference voltage Vref is shared by a plurality of display channels (CH1, CH2 … … CHX). The output ends (b1-bx) of the display channels are connected with corresponding power ground wires (pgnd1-pgndx), wherein each or a plurality of display channels are connected with the same power ground wire GND through independent wire bonding (bondwire). And the power ground wire is connected with the power ground wire of the cathode of the voltage reference unit through a routing.
The power ground wire is used as a common reference ground wire of zero potential of the driving circuit, and the power ground wire is used as a common reference ground wire of zero potential of the power supply. The driving circuit itself has a high voltage, and if the ground line resistance to ground is relatively high, a significant voltage drop occurs to generate large interference. Therefore, a power ground is generally provided for the drive circuit, separately from the power ground.
When the driving circuit structure is as shown in fig. 1, the voltage difference between the input end and the output end of each display channel enables current to flow through the display channel, and the current flows out of the display channel and then flows to the power ground through the routing. Since the wire bonding has a certain resistance, a voltage drop will occur on the wire bonding. Since the channels do not use the same wire bond, the voltage drop on each wire bond may be different, resulting in different power ground voltages (pgnd1-pgndx) for each display channel. Further, since each display channel is directly connected to the voltage reference unit, the voltage value of the actual reference voltage at the input terminal of each display channel will be different, thereby reducing the precision of the reference voltage and the precision of the current of each channel.
In view of the above, the present disclosure provides a driving circuit, a light emitting diode driving chip, a display panel and an electronic device, in which the driving circuit according to the embodiments of the present disclosure can simultaneously drive at least one pixel unit by providing reference voltages of the same magnitude to ensure current accuracy of each pixel unit in the at least one pixel unit, and when a light emitting device is disposed in a pixel unit, a display effect of the light emitting device can be ensured.
FIG. 2 illustrates an exemplary application scenario according to an embodiment of the present disclosure.
As shown in fig. 2, in an application scenario, the driving circuit in the embodiment of the disclosure may be used to drive at least one pixel unit 10 on the OLED display panel, where the at least one pixel unit 10 is respectively connected to the driving circuit, and the driving circuit generates a reference voltage and provides the reference voltage to the at least one pixel unit 10, so that a current flows through the at least one pixel unit 10 to drive the light emitting device in the pixel unit 10 to emit light.
Each pixel unit can be used as a display channel, and at least one display channel is provided with a reference voltage by one voltage reference unit and at least one voltage conversion unit in the driving circuit. The power ground (PGND1-PGNDx) of each channel or each of several channels is connected to the power ground GND by a separate connecting wire (e.g., a wire bond). When current flows through the display channel, the current also flows into the connecting line, and voltage drop is caused on the connecting line.
Fig. 3 illustrates an exemplary structural schematic diagram of a driving circuit according to an embodiment of the present disclosure. As shown in fig. 3, the present disclosure proposes a driving circuit for driving at least one pixel cell 10, the driving circuit comprising a voltage reference unit 20, at least one voltage conversion unit 30,
the voltage reference unit 20 is used for providing the same first reference voltage V1 for each voltage transformation unit 30;
the at least one voltage conversion unit 30 is configured to obtain second reference voltages V2 according to the first reference voltage V1 and provide the second reference voltages V2 to at least one pixel unit 10 respectively so as to drive the at least one pixel unit 10;
the power ground line PGND (PGND1-PGNDx) of the at least one pixel cell 10 and the power ground line GND of the voltage reference cell 20 are respectively connected to the same power ground line GND outside the driving circuit through a connection line.
According to the driving circuit of the embodiment of the disclosure, by arranging the voltage conversion unit between the voltage reference unit and each pixel unit, the first reference voltage output by the voltage reference unit is not directly output to the pixel unit, but is converted into the second reference voltage by the voltage conversion unit and then output to the pixel unit, so that the voltage drop generated when current flows on the connecting line of the pixel unit does not affect the voltage value of the second reference voltage, that is, the driving circuit can provide the reference voltages with the same size for driving at least one pixel unit at the same time. In this way, the current accuracy of each pixel unit in the at least one pixel unit can be ensured, and when the light emitting device is arranged in the pixel unit, the display effect of the light emitting device can be ensured.
Wherein the voltage reference unit 20 may be implemented based on the prior art, for example, reference may be made to the examples of the voltage reference unit in the above and related description of fig. 1. An exemplary structure of the voltage converting unit 30 in the embodiment of the present disclosure and its function are described below.
Fig. 4 illustrates an exemplary structural diagram of the voltage converting unit 30 according to an embodiment of the present disclosure.
As shown in fig. 4, in one possible implementation, for any voltage converting unit of the at least one voltage converting unit 30, the voltage converting unit includes a first charge storing unit 301, a second charge storing unit 302, a first switch group 303 and a second switch group 304,
the first charge storage unit 301 is connected with the voltage reference unit 20 through a first switch group 303;
the second charge storage unit 302 is connected to the first charge storage unit 301 through a second switch group 304, and the second charge storage unit 302 is connected to one pixel unit 10.
The first charge storage unit 301 and the second charge storage unit 302 may respectively include at least one capacitor, or other devices capable of storing charges when charging and releasing charges when discharging, and fig. 4 exemplifies that the first charge storage unit 301 and the second charge storage unit 302 respectively include one capacitor. The present disclosure does not limit the specific structure of the first charge storage unit and the second charge storage unit.
In the driving circuit of the embodiment of the present disclosure, all the voltage converting units 30 may be connected to the same one voltage reference unit 20, and each voltage converting unit 30 may be connected to one pixel unit 10. Referring to fig. 4, GND to which the first switch group 303 is connected may be a power ground of the voltage reference unit 20, and PGND to which the second switch group 304 is connected may be a power ground of the pixel unit 10 shown in fig. 4.
Fig. 5 illustrates an exemplary structural diagram of the voltage converting unit 30 according to an embodiment of the present disclosure.
In one possible implementation, the first switch set 303 includes a first switch S1 and a second switch S2, the second switch set 304 includes a third switch S3 and a fourth switch S4,
a first terminal S11 of the first switch S1 is connected to the output terminal of the voltage reference unit 20, a second terminal S12 of the first switch S1 is connected to the first terminal c11 of the first charge storage unit 301, a second terminal c12 of the first charge storage unit 301 is connected to the second terminal S22 of the second switch S2, and a first terminal S21 of the second switch S2 is connected to the power ground GND of the voltage reference unit 20;
the first end S31 of the third switch S3 is connected to the first end c11 of the first charge storage unit 301, the second end S32 of the third switch S3 is connected to the first end c21 of the second charge storage unit 302, the second end c22 of the second charge storage unit 302 is connected to the second end S42 of the fourth switch S4, and the first end S41 of the fourth switch S4 is connected to the second end c12 of the first charge storage unit 301;
the first terminal c21 of the second charge storage unit 302 is further connected to the one pixel cell 10, and the second terminal c22 of the second charge storage unit 302 is further connected to the power ground PGND of the one pixel cell 10.
The above shows an exemplary structure of a drive circuit according to an embodiment of the present disclosure. An exemplary operation of the driving circuit according to the embodiment of the present disclosure is described below with reference to fig. 4 and 5.
In a possible implementation manner, the voltage converting unit 30 is further configured to receive a control signal, where the control signal causes the switches in the second switch group to be turned off or turned on when the switches in the first switch group are turned on or turned off.
For example, the switches in the first switch group 303 and the second switch group 304 may be switches in the form of field effect transistors, and the voltage conversion unit 30 may achieve the effect of turning off or turning on the switches in the second switch group 304 when controlling the switches in the first switch group 303 to turn on or off according to the control signal by setting the types of the field effect transistors in the first switch group 303 and the second switch group 304 and setting the level of the control signal in a matching manner. Those skilled in the art will appreciate that the switches in the first switch group 303 and the second switch group 304 may be configured as other switches, and the disclosure is not limited thereto.
The switch group is controlled by the control signal to realize the on-off of the switch in the first switch group and the on-off of the switch in the second switch group, so that the realization mode is flexible, the current precision of each pixel unit is ensured, and the use complexity of the driving circuit can be reduced.
In one possible implementation, one working cycle of the driving circuit comprises a first phase and a second phase,
in the first phase, the first charge storage unit 301 is charged by the first reference voltage V1;
in the second phase, the first charge storage unit 301 discharges to the second charge storage unit 302;
wherein the control signal is different in level in the first phase and the second phase.
For example, it may be arranged that the voltage converting unit 30 receives only one kind of control signal, e.g. the first control signal, so that the first control signal has two levels, e.g. a first level and a second level. And the switches in the first switch group 303 may be set to be turned on when receiving the first control signal of the first level and turned off when receiving the first control signal of the second level, and the switches in the second switch group 304 may be set to be turned off when receiving the first control signal of the first level and turned on when receiving the first control signal of the second level. In this case, by setting the levels of the control signals to be different between the first stage and the second stage, for example, setting the first control signal to be the first level in the first stage and the first control signal to be the second level in the second stage, the effect that the switches in the first switch group 303 are turned on and the switches in the second switch group 304 are turned off, and the switches in the first switch group 303 are turned off and the switches in the second switch group 304 are turned on can be achieved.
It should be understood by those skilled in the art that the control signal may have a plurality of setting manners, for example, the voltage converting unit 30 may be configured to receive two control signals with different voltages for controlling the first switch group 303 and the second switch group 304, respectively, or the voltage converting unit 30 may be configured to receive four control signals, each of which controls one switch. The present disclosure is not limited to the setting manner of the control signal as long as the driving circuit can complete the charging and discharging of the first reference voltage V1 according to the control signal, and the charging and discharging are not performed simultaneously.
The charging and the discharging are completed in stages, so that the charging and the discharging cannot be carried out simultaneously, namely the voltage reference unit is not directly conducted to the pixel unit but indirectly conducted through the first switch group and the second switch group, and therefore the situation that when current flows through the connecting line, different voltage drops are generated by different connecting lines, so that the voltage values of the power ground wires of the pixel units are different, and the voltage values of the second reference voltage received by the pixel units are influenced is avoided.
Exemplary operation of each element in the driving circuit of the embodiment of the present disclosure in the first stage and the second stage is described below. Fig. 6 and 7 illustrate equivalent circuit structure diagrams of the voltage conversion unit in the first stage and the second stage, respectively, according to an embodiment of the present disclosure.
As shown in fig. 6 and 7, in a possible implementation manner, in a first phase of one duty cycle of the driving circuit, under the control of the control signal, the first switch S1 and the second switch S2 are turned on, the third switch S3 and the fourth switch S4 are turned off, and the first reference voltage V1 is output to the first charge storage unit 301 to charge the first charge storage unit 301;
in a second phase of one duty cycle of the driving circuit, under the control of the control signal, the first switch S1 and the second switch S2 are turned off, the third switch S3 and the fourth switch S4 are turned on, the first charge storage unit 301 discharges to the second charge storage unit 302, and the second charge storage unit 302 outputs the second reference voltage V2 at the first terminal c 21.
For example, in the first stage, the first switch S1 and the second switch S2 are turned on, the third switch S3 and the fourth switch S4 are turned off, and the driving circuit is equivalent to the circuit diagram shown in fig. 6. In this case, the voltage difference across the first charge storage unit 301 is equal to the first reference voltage V1, and the first reference voltage V1 can be regarded as being stored in the first charge storage unit 301 in the form of a charge, i.e. the voltage reference unit 20 outputs the first reference voltage V1 to charge the first charge storage unit 301. The voltage difference across the second charge storing unit 302 is equal to the original output voltage at the first terminal of the second charge storing unit 302 before entering the first stage, and the original output voltage can also be regarded as being stored in the second charge storing unit 302 in the form of charge, i.e. the second charge storing unit 302 stores the original output voltage at the first terminal of the second charge storing unit 302 before entering the first stage.
In the second stage, the first switch S1 and the second switch S2 are turned off, the third switch S3 and the fourth switch S4 are turned on, and the driving circuit is equivalent to the circuit diagram shown in fig. 7. In this case, the voltage difference across the first charge storage unit 301 in the first phase is superimposed with the voltage difference across the second charge storage unit 302 in the first phase, which can be seen as the first charge storage unit 301 releasing the first reference voltage V1 stored in the form of charge to the second charge storage unit 302, i.e. the first charge storage unit 301 discharging to the second charge storage unit 302.
As can be seen from the equivalent circuit diagrams of the first stage and the second stage, the voltage reference unit 20 does not form a path with the pixel unit 10 in the first stage and the second stage, and therefore, the accuracy of the voltage value of the first reference voltage V1 output by the voltage reference unit is not affected no matter how much voltage drop exists on the connection line of the power ground line and the power ground line of the pixel unit, and further, the accuracy of the voltage value of the second reference voltage V2 output by the voltage conversion unit is not affected. In this way, the accuracy of the second reference voltage is improved, and therefore when the second reference voltage is output to the pixel unit, the accuracy of the current flowing in the pixel unit is also improved.
It should be understood by those skilled in the art that the structure of each voltage converting unit in at least one voltage converting unit 30 may be the example of fig. 3, and may also include more devices, as long as each voltage converting unit can achieve the above-mentioned effects that the voltage reference unit and the pixel unit do not directly form a path and the voltage output by the voltage reference unit can be stably output to the pixel unit through the voltage converting unit when the same voltage reference unit is connected and the power supply and the ground are connected through independent connecting lines, and the specific structure of the voltage converting unit is not limited in the embodiments of the present disclosure.
It should be noted that each unit in the embodiments of the present disclosure may be implemented by a hardware circuit.
In one possible implementation manner, the driving circuit is applied to a light emitting diode driving chip.
The light emitting diode driving chip may include a constant current type LED driving chip. When the driving circuit of the embodiment of the disclosure is applied to the constant current type LED driving chip, at least one pixel unit is used as at least one display channel supported by the constant current type LED driving chip, so that the current precision of each display channel is basically not influenced by the voltage drop of the connecting line.
The embodiment of the present disclosure further provides a light emitting diode driving chip, which includes the driving circuit described above, and a control circuit, where the control circuit is connected to the voltage conversion unit through a signal line, and the control circuit is configured to output a control signal.
When the voltage conversion unit is arranged to receive only one control signal, the driving circuit and the control circuit are connected through only one signal line, and wiring complexity of the light-emitting diode driving chip can be reduced.
The embodiment of the present disclosure further provides a display panel, which includes the above light emitting diode driving chip.
The display panel may also be a large-screen display panel, for example, a large-sized LED display screen disposed indoors or outdoors, or a combined display screen with a larger display capability obtained by combining a plurality of display panels.
In one possible implementation, the display panel may include any one or more of an LED (Light Emitting Diode) display panel, a MiniLED (Mini Light Emitting Diode) display panel, a Micro LED (Micro Light Emitting Diode) display panel, and an OLED (Organic Light-Emitting Diode) display panel.
An embodiment of the present disclosure further provides an electronic device including the display panel described above.
In one possible implementation, the electronic device comprises a display, a smartphone, or a portable device.
The circuit of the embodiment of the present disclosure may be various electronic devices with a display function, which are also referred to as User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), and the like, and is a device that provides voice and/or data connectivity to a user, for example, a handheld device with a wireless connection function, a vehicle-mounted device, and the like. Currently, some examples of terminals are: a mobile phone (mobile phone), a tablet computer, a notebook computer, a palm top computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self-driving (self-driving), a wireless terminal in remote operation (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (smart security), a wireless terminal in city (smart city), a wireless terminal in home (smart home), a wireless terminal in car networking, and the like.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (12)
1. A driving circuit for driving at least one pixel cell, the driving circuit comprising a voltage reference unit, at least one voltage conversion unit,
the voltage reference unit is used for providing the same first reference voltage for each voltage conversion unit;
the at least one voltage conversion unit is used for obtaining second reference voltages according to the first reference voltages and respectively supplying the second reference voltages to at least one pixel unit so as to drive the at least one pixel unit;
the power ground wire of the at least one pixel unit and the power ground wire of the voltage reference unit are respectively connected with the same power ground wire outside the driving circuit through connecting wires.
2. The circuit of claim 1, wherein for any of the at least one voltage conversion unit, the voltage conversion unit comprises a first charge storage unit, a second charge storage unit, a first switch set, and a second switch set,
the first charge storage unit is connected with the voltage reference unit through the first switch group;
the second charge storage unit is connected with the first charge storage unit through the second switch group, and the second charge storage unit is connected with one pixel unit.
3. The circuit of claim 2, wherein the voltage conversion unit is further configured to receive a control signal, and the control signal causes the switches in the second switch group to be turned off or on when the switches in the first switch group are turned on or off.
4. The circuit of claim 2 or 3, wherein the first switch set comprises a first switch and a second switch, wherein the second switch set comprises a third switch and a fourth switch,
the first end of the first switch is connected with the output end of the voltage reference unit, the second end of the first switch is connected with the first end of the first charge storage unit, the second end of the first charge storage unit is connected with the second end of the second switch, and the first end of the second switch is connected with the power supply ground wire of the voltage reference unit;
a first terminal of the third switch is connected to a first terminal of the first charge storage unit, a second terminal of the third switch is connected to a first terminal of the second charge storage unit, a second terminal of the second charge storage unit is connected to a second terminal of the fourth switch, and a first terminal of the fourth switch is connected to a second terminal of the first charge storage unit;
the first end of the second charge storage unit is also connected with the pixel unit, and the second end of the second charge storage unit is also connected with the power ground wire of the pixel unit.
5. A circuit according to any of claims 1-4, wherein one duty cycle of the driver circuit comprises a first phase, a second phase,
in the first phase, the first charge storage unit is charged by the first reference voltage;
in the second phase, the first charge storage unit discharges to the second charge storage unit;
wherein the control signal is different in level in the first phase and the second phase.
6. The circuit of claim 5, wherein in a first phase of one duty cycle of the driving circuit, under the control of the control signal, the first switch and the second switch are turned on, the third switch and the fourth switch are turned off, and the first reference voltage is output to the first charge storage unit to charge the first charge storage unit;
in a second phase of one working cycle of the driving circuit, under the control of the control signal, the first switch and the second switch are turned off, the third switch and the fourth switch are turned on, the first charge storage unit discharges to the second charge storage unit, and the second charge storage unit outputs the second reference voltage at the first end.
7. The circuit according to any one of claims 1-6, wherein the driving circuit is applied to a light emitting diode driving chip.
8. A light emitting diode driving chip, comprising the driving circuit of claims 1 to 7, and a control circuit, wherein the control circuit is connected to the voltage converting unit through a signal line, and the control circuit is configured to output a control signal.
9. A display panel characterized by comprising the light emitting diode driving chip according to claim 8.
10. The display panel of claim 9, wherein the display panel is one of a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, and an organic light emitting diode display panel.
11. An electronic device characterized in that it comprises a display panel as claimed in claim 9 or 10.
12. The electronic device of claim 11, wherein the electronic device comprises a display, a smartphone, or a portable device.
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| CN202210067122.7A CN114360456A (en) | 2022-01-20 | 2022-01-20 | Drive circuit, light emitting diode drive chip, display panel and electronic equipment |
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| CN202210067122.7A CN114360456A (en) | 2022-01-20 | 2022-01-20 | Drive circuit, light emitting diode drive chip, display panel and electronic equipment |
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