CN114187875A - Voltage adjusting circuit and method and display device - Google Patents
Voltage adjusting circuit and method and display device Download PDFInfo
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- CN114187875A CN114187875A CN202111416586.6A CN202111416586A CN114187875A CN 114187875 A CN114187875 A CN 114187875A CN 202111416586 A CN202111416586 A CN 202111416586A CN 114187875 A CN114187875 A CN 114187875A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000010354 integration Effects 0.000 claims abstract description 58
- 239000003990 capacitor Substances 0.000 claims description 75
- 230000033228 biological regulation Effects 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 239000010409 thin film Substances 0.000 abstract description 23
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 19
- 230000002159 abnormal effect Effects 0.000 abstract description 8
- 230000000875 corresponding effect Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 12
- 239000013589 supplement Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
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- 230000006978 adaptation Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
Abstract
The application belongs to the technical field of display devices, and particularly relates to a voltage adjusting circuit, a voltage adjusting method and a display device. The voltage adjusting circuit comprises a charge pump unit, a voltage compensation unit and a power supply integration unit, wherein an initial reference voltage is generated by the power supply integration unit, an initial grid voltage is generated by the charge pump unit according to the initial reference voltage, the initial grid voltage is used as an input voltage of the voltage compensation unit, and the voltage compensation unit generates a compensation voltage through the initial grid voltage; then the power supply integration unit generates a target reference voltage according to the compensation voltage, and finally, a target grid voltage is generated according to the target reference voltage through the charge pump unit and is transmitted to the thin film transistor; the application utilizes the mutual matching of the charge pump unit, the voltage compensation unit and the power supply integration unit, and can generate different grid voltages to control the inversion of liquid crystal molecules, thereby avoiding the occurrence of abnormal pictures and influencing the use condition of users.
Description
Technical Field
The application belongs to the technical field of display devices, and particularly relates to a voltage adjusting circuit, a voltage adjusting method and a display device.
Background
The thin film transistor liquid crystal display screen means that each liquid crystal pixel point on the liquid crystal display screen is driven by a thin film transistor integrated behind the liquid crystal pixel point. When the thin film transistor liquid crystal display panel is driven, in each field period, the thin film transistor is required to be opened once so as to charge and discharge the capacitor once, the voltage for opening the thin film transistor is the VGH voltage, and the voltage for closing the thin film transistor is the VGL voltage.
However, in the conventional voltage adjusting circuit, the VGH voltage is output with a constant value, and the characteristics of the liquid crystal molecules are different under different environmental conditions, so that if a constant VGL voltage is used, it may be difficult to realize the inversion of the liquid crystal molecules, and the abnormal condition of the screen may occur, which affects the use of the user.
Disclosure of Invention
The present application is directed to a voltage adjustment circuit, a voltage adjustment method and a display device, which at least to some extent overcome the technical problems of difficulty in liquid crystal molecule inversion and abnormal picture caused by constant VGH voltage in the related art.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
According to a first aspect of embodiments of the present application, there is provided a voltage regulation circuit including a charge pump unit, a voltage compensation unit, and a power supply integration unit;
the output end of the power supply integration unit is connected with the input end of the charge pump unit, and the power supply integration unit is used for generating an initial reference voltage;
the charge pump unit is used for receiving an initial reference voltage sent by the power supply integration unit and generating an initial grid voltage by using the initial reference voltage;
the input end of the voltage compensation unit is connected with the output end of the charge pump unit, the voltage compensation unit is used for receiving the initial grid voltage and generating a compensation voltage according to the initial grid voltage, the output end of the voltage compensation unit is connected with the feedback end of the power supply integration unit, and the power supply integration unit is also used for generating a target reference voltage according to the compensation voltage;
the charge pump unit is used for receiving the target reference voltage and generating a target gate voltage by using the target reference voltage, and the output end of the charge pump unit is used for connecting the gate drive circuit and transmitting the target gate voltage to the gate drive circuit.
In some embodiments of the present application, based on the above technical solution, the charge pump unit includes a voltage input terminal and at least one charge component, the charge component includes a capacitor and a diode, the capacitor is connected to the output terminal of the power integration unit, a first end of the diode is connected to the voltage input terminal, a second end of the diode is used for connecting the gate driving circuit, and the capacitor and the diode are arranged in parallel.
In some embodiments of the present application, based on the above technical solution, the charge pump unit includes a voltage input terminal, a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, a third diode, and a fourth diode;
one end of the second capacitor and one end of the third capacitor are respectively connected with the power supply integration unit, the other end of the second capacitor is connected to a first node, the first node is connected with the second end of the first diode and the first end of the second diode, the other end of the third capacitor is connected to a second node, and the second node is connected with the second end of the third diode and the first end of the fourth diode;
the voltage input end is connected with a first end of the first diode, the second diode, the third diode and the fourth diode are sequentially connected, one end of the first capacitor is connected to a third node, the third node is connected with a second end of the second diode and a first end of the third diode, and the other end of the first capacitor is grounded; and the second end of the fourth diode is used for connecting the gate drive circuit.
In some embodiments of the present application, based on the above technical solution, the voltage compensation unit includes a temperature compensation unit, the temperature compensation unit is configured to receive the initial gate voltage and change the initial gate voltage according to a change in temperature, the temperature compensation unit includes a temperature sensitive resistor, a first end of the temperature sensitive resistor is connected to an output end of the charge pump unit, and a second end of the temperature sensitive resistor is connected to a feedback end of the power integration unit.
In some embodiments of the present application, based on the above technical solution, the temperature compensation unit includes a first resistor, a second resistor, and a third resistor, the first resistor is connected in parallel with the third resistor, the first resistor is connected with the first end of the third resistor the output end of the charge pump unit, the first resistor is connected with the second end of the third resistor to form a fourth node, the first end of the second resistor is connected with the fourth node, the other end of the second resistor is grounded, the fourth node is connected with the feedback end of the power supply integration unit, one of the first resistor or the third resistor is a temperature-sensitive resistor.
In some embodiments of the present application, based on the above technical solution, the voltage adjustment circuit further includes a voltage stabilization unit, where the voltage stabilization unit is connected to the output end of the charge pump unit and is configured to be connected to the gate driving circuit.
In some embodiments of the present application, based on the above technical solution, the voltage stabilizing unit includes a resistance-capacitance voltage reducing circuit, the resistance-capacitance voltage reducing circuit includes a zener diode, a fourth resistor, and a fourth capacitor, a first end of the zener diode is grounded, a second end of the zener diode is connected in series with a first end of the fourth resistor, a second end of the fourth resistor is connected to the output end of the charge pump unit, a first end of the fourth capacitor is grounded, and a second end of the fourth capacitor is connected to the output end of the charge pump unit.
According to a second aspect of the embodiments of the present application, there is also provided a voltage adjustment method, including:
generating an initial reference voltage by using a power supply integration unit;
generating an initial gate voltage based on the initial reference voltage with a charge pump unit;
generating a compensation voltage based on the initial gate voltage with a voltage compensation unit;
generating a target reference voltage according to the compensation voltage by using the power supply integration unit;
generating, with the charge pump unit, a target gate voltage based on the target reference voltage.
In some embodiments of the present application, based on the above technical solution, a method for receiving the initial gate voltage by using a voltage compensation unit and generating a compensation voltage according to the initial gate voltage includes:
changing the initial gate voltage according to a change in temperature with the voltage compensation unit to generate a compensation voltage.
According to a third aspect of the embodiments of the present application, there is also provided a display device, including a display panel, a gate driving circuit, and the voltage adjusting circuit as described above, wherein the voltage adjusting circuit is connected to the gate driving circuit, and the gate driving circuit is connected to the display panel or integrated on the display panel.
In the technical scheme provided by the embodiment of the application, the initial reference voltage is generated by the power supply integration unit, the initial grid voltage is generated by the charge pump unit according to the initial reference voltage, the initial grid voltage is used as the input voltage of the voltage compensation unit, and the voltage compensation unit generates the compensation voltage through the initial grid voltage; then the power supply integration unit generates a target reference voltage according to the compensation voltage, and finally, a target grid voltage is generated according to the target reference voltage through the charge pump unit and is transmitted to the grid driving circuit, and the target grid voltage is transmitted to the thin film transistor through the grid driving circuit; the application realizes the adjustment of the grid voltage on the thin film transistor by utilizing the mutual matching of the charge pump unit, the voltage compensation unit and the power supply integration unit. The input voltage of the voltage compensation unit is directly from the initial grid voltage converted by the charge pump unit, so that the circuit structure can be simplified; moreover, the voltage compensation unit can provide different compensation voltages for the thin film transistor, so that different grid voltages can be generated to control liquid crystal molecule inversion, and the condition that the use of a user is influenced due to abnormal pictures is avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 schematically shows a circuit diagram of a voltage regulation circuit according to a first embodiment of the present application.
Fig. 2 schematically shows a circuit diagram of a charge pump unit including a charge component according to a first embodiment of the present application.
Fig. 3 schematically shows a circuit diagram of a charge pump unit including three charge components according to the first embodiment of the present application.
Fig. 4 schematically shows a circuit structure diagram of a first scheme of the temperature compensation unit according to the first embodiment of the present application.
Fig. 5 schematically shows a circuit diagram of the voltage adjusting circuit for adjusting the voltage of VGL of the present application.
Fig. 6 schematically shows a circuit structure diagram of the temperature compensation unit according to the first embodiment of the present application after a fifth resistor is added.
Fig. 7 schematically shows a theoretical temperature compensation curve when the voltage adjustment circuit according to the first embodiment of the present application performs voltage adjustment.
Fig. 8 schematically shows an actual temperature compensation curve when the voltage adjusting circuit according to the first embodiment of the present application performs voltage adjustment.
Fig. 9 schematically shows a flowchart of a voltage adjustment method according to the second embodiment of the present application.
Fig. 10 schematically shows a schematic view of a display device according to a third embodiment of the present application.
In the figure: 100-a voltage regulation circuit; 110-a charge pump unit; 120-a voltage compensation unit; 130-a power supply integration unit; 131-the output of the power integration unit; 111-input of the charge pump unit; 210-voltage input; 220-capacitance; 230-a diode; 231-first end of diode; 232-second terminal of diode; 113-a first capacitance; 114-a second capacitance; 115-third capacitance; 116-a first diode; 117-second diode; 118-a third diode; 119-a fourth diode; p1-first node; p2-second node; p3-third node; 310-a fifth capacitance; 320-a sixth capacitance; 330-fifth diode; 340-a sixth diode; 121-input of voltage compensation unit; 112-an output of the charge pump unit; 122-the output of the voltage compensation unit; 410-temperature sensitive resistor; 123-a first resistance; 124-a second resistance; 125-third resistance; p4-fourth node; 132-feedback terminal of power supply integration unit; 140-a voltage stabilizing unit; 141-a zener diode; 142-a fourth resistance; 143-a fourth capacitance; 610-a fifth resistance; 1000-a display device; 1010-a display panel; 1020-gate drive circuit.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The voltage adjusting circuit 100, the voltage adjusting method and the display device provided by the present application will be described in detail with reference to the following embodiments.
Example one
According to a first aspect of the embodiments of the present application, a first embodiment of the present application provides a voltage regulation circuit 100, as shown in fig. 1, and fig. 1 schematically illustrates a circuit diagram of the voltage regulation circuit 100 according to the first embodiment of the present application.
The voltage adjustment circuit 100 of the present application includes a charge pump unit 110, a voltage compensation unit 120, and a power supply integration unit 130.
Wherein the output terminal 131 of the power integration unit is connected to the input terminal 111 of the charge pump unit, and the power integration unit 130 is used for generating an initial reference voltage. The Power supply integrated unit 130 is also called a Power integrated circuit (Power IC), and refers to a pulse width control integration of a switching Power supply, and the Power supply adjusts the stability of the output voltage and current through the Power supply integrated unit 130. Different elements may be integrated in the power integration unit 130 to realize different functions, for example, the power integration unit 130 may integrate battery charging and discharging management to realize charging and discharging.
The initial reference voltage of the present application may be a pulse width modulation square wave voltage (PWM square wave voltage), and the corresponding power integration unit 130 may integrate a pulse width modulation controller (PWM controller). PWM controllers are methods of digitally encoding the level of an analog signal by controlling the analog circuit with the digital output of a microprocessor. Therefore, the output of the PWM square wave voltage can be realized by the power supply integration unit 130 of the present application.
The charge pump unit 110 is configured to receive an initial reference voltage sent by the power supply integration unit 130, and generate an initial gate voltage using the initial reference voltage. The charge pump cell 110 of the present application may be a switched capacitor voltage converter, which is a dc-to-dc converter that utilizes "fast" or "pumped" capacitors (non-inductive or transformer) to store energy. The basic principle of a charge pump is that a high voltage is generated by the accumulation effect of a capacitor on charges, so that current flows from a low potential to a high potential. This is commonly referred to as charging a capacitor, removing the capacitor from the charging circuit to isolate the charge that was charged, and then connecting to another circuit to transfer the charge that was isolated.
In an alternative embodiment, the charge pump unit 110 of the present application includes a voltage input terminal 210 and at least one charge component, as shown in fig. 2, and fig. 2 schematically illustrates a circuit diagram of the charge pump unit 110 of the first embodiment of the present application including one charge component. The charge component of the present application includes a capacitor 220 and a diode 230, wherein the capacitor 220 is connected to the output terminal 131 of the power integrated unit, a first terminal 231 of the diode 230 is connected to the voltage input terminal 210, a second terminal 232 of the diode 230 is used for connecting to the gate driving circuit, and the capacitor 220 is connected in parallel with the diode 230.
The initial reference voltage can be converted into the initial gate voltage by a charge component, and the specific calculation formula is as follows:
V’first stage＝Vin+VFirst stage
Wherein, V'First stageIs the initial gate voltage, VFirst stageIs an initial reference voltage, VinIs the voltage at the voltage input 210. Therefore, the present application may convert the initial reference voltage into the initial gate voltage using the charge means, by which the voltage value of the initial reference voltage may be increased.
In order to further increase the voltage value of the initial gate voltage output by the present application, the present application may arrange the number of charge components as needed. For example, with continued reference to FIG. 1, in an alternative embodiment, the charge components of the present application may be two. In this case, the charge pump unit 110 of the present application includes a voltage input terminal 210, a first capacitor 113, a second capacitor 114, a third capacitor 115, a first diode 116, a second diode 117, a third diode 118, and a fourth diode 119; one end of the second capacitor 114 and one end of the third capacitor 115 are respectively connected to the power integration unit 130, and the second capacitor 114 and the third capacitor 115 are used for receiving an initial reference voltage sent by the power integration unit 130, but may also be used for receiving a target reference voltage. Meanwhile, the second capacitor 114 and the third capacitor 115 may also store an initial reference voltage transmitted by the power integrated unit 130, and then transmit the initial reference voltage and the input voltage of the voltage input terminal 210 to the gate driving circuit together to form an initial gate voltage or a target gate voltage. The other terminal of the second capacitor 114 is connected to a first node P1, a first node P1 is connected to the second terminal of the first diode 116 and the first terminal of the second diode 117, the other terminal of the third capacitor 115 is connected to a second node P2, and a second node P2 is connected to the second terminal of the third diode 118 and the first terminal of the fourth diode 119.
The voltage input end 210 is connected with a first end of the first diode 116, the second diode 117, the third diode 118 and the fourth diode 119 are sequentially connected, one end of the first capacitor 113 is connected to a third node, the third node is connected with a second end of the second diode 117 and a first end of the third diode 118, and the other end of the first capacitor 113 is grounded; a second terminal of the fourth diode 119 is used for connecting a gate driving circuit. The first capacitor 113 of the present application is used to store the voltage introduced by the second capacitor 114 and transmit the voltage introduced by the second capacitor 114 to the third diode 118. In the charge pump unit 110 of fig. 1, the voltage input terminal 210 first generates an input voltage VinV input by the second capacitor 114 is received through the first diode 116 and then to the first node P1First stageThe voltage transmitted at this time is VFirst stage+VinThen continues through the second diode 117 to the third node where V is stored by the first capacitor 113First stage+VinContinuing to transmit back to the third diode 118, receiving V from the third capacitor 115First stageThe voltage transmitted at this time is Vin+2×VFirst stageAnd then continues through the fourth diode 119 and finally is output through the gate driving circuit. Thus, with the two charge components of the charge pump cell 110 of the present application, the initial gate voltage or the target gate voltage can be further amplified. Wherein the specific meter is calculated by two charge unitsThe calculation formula is as follows:
V’first stage＝Vin+2×VFirst stage
Of course, the present application may further arrange the number of the charge components according to the gate voltage condition that needs to be amplified, for example, three charge components or more than three charge components may also be arranged. As shown in fig. 3, fig. 3 schematically shows a circuit diagram of the charge pump unit 110 according to the first embodiment of the present application, which includes three charge components. After three charge components are arranged, a fifth capacitor 310, a sixth capacitor 320, a fifth diode 330 and a sixth diode 340 are added, wherein the fifth capacitor 310 has a function similar to that of the second capacitor 114, and the sixth capacitor 320 has a function similar to that of the first capacitor 113. The corresponding specific calculation formula calculated by the three charge components is as follows:
V’first stage＝Vin+3×VFirst stage
The above discloses the details of the charge pump cell 110 of the present application, and the following continues to disclose the contents of other cells of the present application.
The input terminal 121 of the voltage compensation unit of the present application is connected to the output terminal 112 of the charge pump unit, and the voltage compensation unit 120 is configured to receive an initial gate voltage and generate a compensation voltage according to the initial gate voltage. The voltage compensation unit 120 of the present application may provide a compensation voltage for the initial gate voltage to further amplify the initial gate voltage. The input voltage of the voltage compensation unit 120 of the present application is not from a constant voltage terminal that is independently set and inputs a fixed value, but the input voltage of the voltage compensation unit 120 of the present application is directly input by the initial gate voltage, and the value of the initial gate voltage is not constant.
After the voltage compensation unit 120 of the present application generates the compensation voltage, the output terminal 122 of the voltage compensation unit is connected to the feedback terminal 132 of the power integration unit, and the power integration unit 130 is further configured to generate the target reference voltage according to the compensation voltage. Since the output terminal 122 of the voltage compensation unit of the present application is connected to the feedback terminal 132 of the power integration unit, when the target reference voltage is output from the output terminal 112 of the charge pump unit, the corresponding input voltage flowing into the voltage compensation unit again has changed. The variation is caused by the voltage compensation unit, and when the initial gate voltage reaches the voltage compensation unit 120, the initial gate voltage is further amplified to generate a compensation voltage, which affects the power integration unit 130 to output a target reference voltage different from the initial reference voltage, and finally controls to output a target gate voltage different from the initial gate voltage. Therefore, the structure of the circuit can be simplified by using the voltage compensation unit 120 of the present application.
In an alternative embodiment, the voltage compensation unit 120 of the present application includes a temperature compensation unit for receiving the initial gate voltage and changing the magnitude of the initial gate voltage according to a change in temperature. The temperature compensation unit of the present application may have various schemes, wherein, as shown in fig. 4, fig. 4 schematically shows a circuit structure diagram of a first scheme of the temperature compensation unit 120 according to a first embodiment of the present application. The first scheme of the temperature compensation unit includes a temperature-sensitive resistor 410, wherein a first end of the temperature-sensitive resistor 410 is connected to the output end 112 of the charge pump unit, and a second end of the temperature-sensitive resistor 410 is connected to the feedback end 132 of the power integration unit.
When the temperature compensation unit of the present application is the temperature sensitive resistor 410, the relationship between the corresponding initial gate voltage and the compensation voltage is as follows:
Vsupplement device＝V’First stage×(1+R)
Wherein, VSupplement deviceIs the voltage value of the compensation voltage, V'First stageIs the initial gate voltage and R is the resistance of the temperature sensitive resistor 410.
According to the above formula, when the resistance of the temperature sensitive resistor 410 becomes larger, the corresponding compensation voltage V is obtainedSupplement deviceAnd also becomes larger. The temperature-sensitive resistor 410 of the present application can be set as a temperature-sensitive resistor 410 with a negative temperature coefficient and a temperature-sensitive resistor 410 with a positive temperature coefficient according to requirements. For example, most liquid crystal molecules can be driven at low temperature by high voltage, and at this time, the temperature-sensitive resistor 410 can be set as the temperature-sensitive resistor 410 with a negative temperature coefficient, so that temperature reduction is realized, the resistance value of the temperature-sensitive resistor 410 is increased, and the corresponding compensation voltage is increasedSo that the gate voltage that finally drives the liquid crystal molecules also becomes large. For some special molecules, when high voltage is needed for driving at high temperature, the temperature-sensitive resistor 410 with positive temperature coefficient can be set, and the temperature and the resistance value are increased.
The contents of the first aspect of the temperature compensation unit of the present application are introduced above, and the contents of the second aspect of the temperature compensation unit of the present application are continued to be described next.
In an alternative embodiment, with continued reference to fig. 1, the temperature compensation unit 120 of the present application includes a first resistor 123, a second resistor 124, and a third resistor 125, the first resistor 123 is connected in parallel with the third resistor 125, a first end of the first resistor 123 and a first end of the third resistor 125 are connected to the output terminal 112 of the charge pump unit, the first resistor 123 and a second end of the third resistor 125 are connected to a fourth node P4, a first end of the second resistor 124 is connected to the fourth node P4, another end of the second resistor 124 is connected to ground, the fourth node P4 is connected to the feedback terminal 132 of the power supply integration unit, and one of the first resistor 123 and the third resistor 125 may be a temperature-sensitive resistor. The second scheme of the temperature compensation unit of the application introduces two resistors besides the temperature-sensitive resistor, wherein one resistor is connected with the temperature-sensitive resistor in parallel, and the two introduced resistors are used for finding the appropriate temperature-sensitive resistor more conveniently. For the first scheme of the temperature compensation unit, a proper temperature-sensitive resistor 410 just exists, and the temperature-sensitive resistor 410 can be stably controlled to form stable voltage change along with the change of temperature, but the very stable temperature-sensitive resistor is difficult to find in practical situations, so that the resistance value and the temperature change of the temperature-sensitive resistor are very stable, therefore, in order to solve the problem, two resistors are introduced for adjustment, so that more temperature-sensitive resistors can be selected, and the proper temperature-sensitive resistor can be found more easily.
When the first resistor 123 of the present application is a temperature sensitive resistor, in the second scheme of the temperature compensation unit, the relationship between the corresponding initial gate voltage and the compensation voltage is as follows:
Vsupplement device＝V’First stage×{1+[R1×R3/(R1+R3)]/R2}
Wherein, VSupplement deviceIs the voltage value of the compensation voltage, V'First stageIs the initial gate voltage, R1Is the resistance value, R, of the first resistor 1232Is the resistance value, R, of the second resistor 1243Is the resistance of the third resistor 125.
The compensation voltage V can be obtained by the formulaSupplement deviceWith the value of R1×R3/(R1+R3) Is increased correspondingly to the increase of the third resistance 125R3In the fixed condition, the first resistor 123R1The larger, the corresponding R1×R3/(R1+R3) The larger. However, since the present application introduces the third resistor 125R3And a second resistor R2So that the first resistor 123R1And a compensation voltage VSupplement deviceOr positively correlated, but the first resistance 123R1For compensation voltage VSupplement deviceThe effect of (a) is relatively reduced. For example, in the first embodiment of the temperature compensation unit of the present application, the temperature-sensitive resistor 410R is increased by 1 ohm, corresponding to VSupplement deviceThe improvement is doubled; in the second embodiment of the temperature compensation unit of the present application, when the first resistor 123R is used1At an increase of 1 ohm, e.g. R3Is 1. omega., R2Is 1 Ω, the initial first resistance 123 is 1 Ω, and the increased first resistance 123 is 2 Ω. Corresponding compensation voltage VSupplement deviceFrom 1/2 XVFirst stageIs improved to 2/3 XVFirst stageThe improvement value is small, so that the corresponding temperature-sensitive resistor 410 does not need to be very accurate, and therefore, a suitable temperature-sensitive resistor can be found more conveniently to realize the scheme of the temperature compensation unit.
After the voltage compensation unit 120 of the present application generates the compensation voltage, the power integration unit 130 generates a target reference voltage according to the compensation voltage, and inputs the target reference voltage into the charge pump unit 110, the charge pump unit 110 is further configured to receive the target reference voltage and generate a target gate voltage using the target reference voltage, and the output terminal 112 of the charge pump unit is configured to be connected to the gate driving circuit and configured to transmit the target gate voltage to the gate driving circuit. Therefore, the target gate voltage can be output to the gate of the thin film transistor through the gate driving circuit, and the thin film transistor can be turned on and off.
When the charge pump unit 110 of the present application adopts the scheme as shown in fig. 1, the charge pump unit 110 generates a target gate voltage using a target reference voltage, and the relationship between the target gate voltage and the target reference voltage is as follows:
V’eyes of a user＝Vin+2×VEyes of a user
Wherein, V'Eyes of a userIs the target gate voltage, VEyes of a userIs a target reference voltage, VinIs the voltage at the voltage input 210.
The above section describes the content of the voltage compensation unit 120 of the voltage adjustment circuit 100 of the present application, and the content of other units is continued to be described.
In an alternative embodiment, the voltage adjusting circuit 100 further includes a voltage stabilizing unit 140, and the voltage stabilizing unit 140 is connected to the output terminal 112 of the charge pump unit and is configured to be connected to the gate driving circuit. The voltage stabilizing unit 140 is used to protect the liquid crystal molecules and prevent the liquid crystal molecules from being damaged and being unable to be inverted due to an excessive voltage. Since the voltage compensation unit 120 of the present application can perform voltage compensation according to temperature variation, if the target gate voltage is continuously increased after the temperature is lower than a certain threshold, the liquid crystal molecules may be damaged. Therefore, the present application designs a voltage stabilizing unit 140, by which the maximum value of the target gate voltage outputted to the gate driving circuit can be controlled to maintain a threshold value, for example, 35V, and when the target gate voltage exceeds 35V, the voltage stabilizing unit 140 only maintains 35V to be supplied to the gate driving circuit. There are various schemes for designing the voltage regulation unit 140, for example, a flip-flop may be designed in the voltage regulation unit 140, and when the voltage exceeds 35V, the flip-flop is triggered to achieve a stable 35V output. The voltage stabilization unit 140 of the present application may also be the following scheme.
In an alternative embodiment, the voltage stabilizing unit 140 includes a resistor-capacitor voltage reducing circuit, the resistor-capacitor voltage reducing circuit includes a zener diode 141, a fourth resistor 142 and a fourth capacitor 143, a first end of the zener diode 141 is grounded, a second end of the zener diode 141 is connected in series with a first end of the fourth resistor 142, a second end of the fourth resistor 142 is connected to the output terminal 112 of the charge pump unit, a first end of the fourth capacitor 143 is grounded, and a second end of the fourth capacitor 143 is connected to the output terminal 112 of the charge pump unit.
The principle of the resistance-capacitance voltage reduction circuit is that capacitance reactance generated by a capacitor under a certain alternating current signal frequency is utilized to limit the maximum working current to reduce voltage through the capacitor. The fourth capacitor 143 of the present application is a step-down capacitor, the fourth resistor 142 is a discharge resistor of the fourth capacitor 143 when the power supply is disconnected, the zener diode 141 has a forward characteristic and a reverse characteristic, the reverse characteristic (i.e., the zener characteristic) stabilizes the voltage, and the forward characteristic is used to provide a discharge loop for the discharge resistor in the negative half cycle of the utility power. When the zener diode 141 of the present application selects the 35V zener diode 141, and the fourth capacitor 143 and the fourth resistor 142 select the rc value matching the rc step-down circuit, the purpose of voltage stabilization can be achieved.
It should be noted that the voltage adjustment circuit 100 of the present application can be used to adjust not only the voltage for turning on the thin film transistor, i.e., the VGH voltage, but also the voltage for turning off the thin film transistor, i.e., the VGL voltage. When the first terminal D1 of each diode of the present application is an anode and the second terminal D2 is a cathode (wherein the first terminal D1 and the second terminal D2 of each diode of the present application may be fixed sides in fig. 5 and fig. 1, specifically as shown in fig. 5), the corresponding voltage adjusting circuit 100 may adjust a voltage for turning on the thin film transistor, i.e., the VGH voltage. With continued reference to fig. 1, the first diode 116, the second diode 117, the third diode 118, and the fourth diode 119 in the charge pump unit 110 of the present application have a positive terminal and a negative terminal. At this time, the VGH voltage to turn on the thin film transistor is adjusted. When the thin film transistor is turned on, the first terminal of the zener diode 141 in the corresponding zener unit 140 is a positive terminal, and the second terminal is a negative terminal.
As shown in fig. 5, fig. 5 schematically shows a circuit diagram of the voltage adjusting circuit 100 for adjusting the VGL voltage according to the present application. Fig. 5 is the same as fig. 1 except for the orientation of the individual diodes. When the first terminal of each diode in the present application is a negative electrode and the second terminal is a positive electrode, the first terminals of the first diode 116, the second diode 117, the third diode 118, and the fourth diode 119 in the charge pump unit 110 in the present application are negative electrodes and the second terminals are positive electrodes. Due to the unidirectional nature of the diodes, the voltage at the output 112 of the charge pump unit is now a negative voltage. For example, the voltage is-5V. At this time, the VGL voltage for turning off the tft is adjusted, and the corresponding voltage adjusting circuit 100 can adjust the voltage for turning off the tft.
Therefore, the voltage adjusting circuit 100 of the present application can adjust the direction of the diode according to the use requirement, thereby implementing the turning on and off of the thin film transistor, and is convenient to adjust and flexible to use.
The first embodiment in the above section discloses a specific structure of the voltage regulation circuit 100 of the present application, and the present application verifies the voltage regulation effect of the present application through a specific experiment. The specific verification process is as follows:
in order to find out a matched temperature-sensitive resistor more conveniently, a fifth resistor 610 is further added above the first resistor 123 and the third resistor 125, and the fifth resistor 610 is connected in series with a circuit formed by connecting the first resistor 123 and the third resistor 125 in parallel, as shown in fig. 6, fig. 6 schematically shows a circuit structure diagram formed by adding the fifth resistor 610 to the temperature compensation unit according to the first embodiment of the present invention. Taking the temperature compensation unit corresponding to fig. 5 as an example, the following details are given in conjunction with fig. 1 of the present application.
Selecting a resistance value of the first resistor 123 to be 47K omega, wherein the first resistor 123 is a temperature-sensitive resistor with a negative temperature coefficient, the second resistor 124 is 10K omega, the third resistor 125 is 90K omega, the fourth resistor 142 is 212K omega, the resistor precision is 1%, the target temperature variation range is 10-20 ℃, the target gate voltage starts to climb along with the reduction of the temperature until the temperature is reduced to-20 ℃, and the target gate voltage V'Eyes of a user(V 'is represented by VGH in FIGS. 7 and 8'Eyes of a userOf) reaches a maximum value of 35V, and then the corresponding target gate voltage is maintained at 35V even if the temperature continues to decrease. As shown in fig. 7, fig. 7 schematically shows a theoretical temperature compensation curve when the voltage adjusting circuit 100 according to the first embodiment of the present application adjusts the voltage. By means of the present applicationAs shown in fig. 8, fig. 8 schematically shows an actual temperature compensation curve when the voltage adjusting circuit 100 according to the first embodiment of the present application adjusts the voltage. As can be seen from comparing fig. 7 and fig. 8, the actual temperature compensation curve of the voltage adjustment circuit 100 of the present application is substantially consistent with the theoretical curve, and therefore, the voltage adjustment circuit 100 of the present application can achieve a better voltage adjustment effect to control the inversion of liquid crystal molecules, thereby avoiding the occurrence of abnormal pictures and affecting the use of users.
According to the present disclosure, an initial reference voltage is generated by the power integration unit 130, an initial gate voltage is generated by using the initial reference voltage according to the charge pump unit 110, the initial gate voltage is used as an input voltage of the voltage compensation unit 120, and the voltage compensation unit 120 generates a compensation voltage by using the initial gate voltage; then, the power integration unit 130 generates a target reference voltage according to the compensation voltage, and finally, generates a target gate voltage according to the target reference voltage through the charge pump unit 110, and transmits the target gate voltage to the gate driving circuit, and transmits the target gate voltage to the thin film transistor through the gate driving circuit; the application realizes the adjustment of the gate voltage on the thin film transistor by the mutual cooperation of the charge pump unit 110, the voltage compensation unit 120 and the power supply integration unit 130. The voltage compensation unit 120 can provide different compensation voltages for the thin film transistor, so that different gate voltages can be generated to control the inversion of liquid crystal molecules, thereby avoiding the occurrence of abnormal pictures and influencing the use of users.
Example two:
in the above section, the content of the first embodiment of the present application is described, and then the content of the second embodiment of the present application is described continuously, according to the second aspect of the embodiment of the present application, the present application further provides a voltage adjusting method, as shown in fig. 9, and fig. 9 schematically illustrates a flowchart of the voltage adjusting method according to the second embodiment of the present application. The method includes steps S910 to S950.
Step S910: an initial reference voltage is generated using the power supply integration unit.
The power supply integration unit 130 of the present application may integrate a PWM controller, and generate an initial reference voltage by using the PWM controller, wherein the initial reference voltage may be a PWM square wave voltage.
Step S920: an initial gate voltage is generated based on an initial reference voltage with a charge pump unit.
The charge pump unit 110 amplifies an initial reference voltage by a plurality of charge parts and generates an initial gate voltage in combination with an input voltage.
Step S930: a compensation voltage is generated based on the initial gate voltage using a voltage compensation unit.
Step S940: and generating a target reference voltage according to the compensation voltage by using the power supply integration unit.
Step S950: a target gate voltage is generated based on a target reference voltage with a charge pump unit.
In an alternative embodiment, the method for generating the compensation voltage based on the initial gate voltage by using the voltage compensation unit 120 in step S930 includes: the initial gate voltage is changed according to a change in temperature by the voltage compensation unit 120 to generate a compensation voltage.
The content corresponding to the above steps may refer to the content of the voltage adjustment circuit 100, and is not described herein again.
By using the voltage adjusting method, the voltage of the thin film transistor can be adjusted to generate different grid voltages so as to control the inversion of liquid crystal molecules, and the condition that the use of a user is influenced due to abnormal pictures is avoided.
EXAMPLE III
As shown in fig. 10, fig. 10 schematically shows a schematic view of a display device according to a third embodiment of the present application. The present embodiment further provides a display apparatus 1000, which includes a display panel 1010, a gate driving circuit 1020, and a voltage adjusting circuit 100, wherein the voltage adjusting circuit 100 is connected to the gate driving circuit 1020, and can be connected to the gate driving circuit 1020 through an output terminal of a charge pump unit of the voltage adjusting circuit 100. The gate driving circuit 1020 is connected to the display panel 1010 or the gate driving circuit 1020 is integrated on the display panel 1010 (in fig. 10, the gate driving circuit 1020 is provided separately from the display panel 1010).
The display device can adjust the voltage of the thin film transistor to generate different grid voltages so as to control the inversion of liquid crystal molecules, and avoid the phenomenon that the use of a user is influenced due to abnormal pictures.
The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.
It should be noted that, although the terms "first", "second", etc. may be used herein to describe various elements, components, elements, regions, layers and/or sections, these elements, components, elements, regions, layers and/or sections should not be limited by these terms. Rather, these terms are used to distinguish one element, component, element, region, layer or section from another.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A voltage regulation circuit is characterized by comprising a charge pump unit, a voltage compensation unit and a power supply integration unit;
the output end of the power supply integration unit is connected with the input end of the charge pump unit, and the power supply integration unit is used for generating an initial reference voltage;
the charge pump unit is used for receiving an initial reference voltage sent by the power supply integration unit and generating an initial grid voltage by using the initial reference voltage;
the input end of the voltage compensation unit is connected with the output end of the charge pump unit, the voltage compensation unit is used for receiving the initial grid voltage and generating a compensation voltage according to the initial grid voltage, the output end of the voltage compensation unit is connected with the feedback end of the power supply integration unit, and the power supply integration unit is also used for generating a target reference voltage according to the compensation voltage;
the charge pump unit is used for receiving the target reference voltage and generating a target gate voltage by using the target reference voltage, and the output end of the charge pump unit is used for connecting the gate drive circuit and transmitting the target gate voltage to the gate drive circuit.
2. The voltage regulation circuit of claim 1, wherein the charge pump unit comprises a voltage input terminal and at least one charge component, the charge component comprises a capacitor and a diode, the capacitor is connected to the output terminal of the power integration unit, a first terminal of the diode is connected to the voltage input terminal, a second terminal of the diode is connected to the gate driving circuit, and the capacitor is connected in parallel with the diode.
3. The voltage regulation circuit of claim 1, wherein the charge pump unit comprises a voltage input terminal, a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, a third diode, and a fourth diode;
one end of the second capacitor and one end of the third capacitor are respectively connected with the power supply integration unit, the other end of the second capacitor is connected to a first node, the first node is connected with the second end of the first diode and the first end of the second diode, the other end of the third capacitor is connected to a second node, and the second node is connected with the second end of the third diode and the first end of the fourth diode;
the voltage input end is connected with a first end of the first diode, the second diode, the third diode and the fourth diode are sequentially connected, one end of the first capacitor is connected to a third node, the third node is connected with a second end of the second diode and a first end of the third diode, and the other end of the first capacitor is grounded;
and the second end of the fourth diode is used for connecting the gate drive circuit.
4. The voltage adjustment circuit according to claim 1, wherein the voltage compensation unit comprises a temperature compensation unit, the temperature compensation unit is configured to receive the initial gate voltage and change the initial gate voltage according to a change of temperature, the temperature compensation unit comprises a temperature-sensitive resistor, a first end of the temperature-sensitive resistor is connected to the output end of the charge pump unit, and a second end of the temperature-sensitive resistor is connected to the feedback end of the power integration unit.
5. The voltage adjustment circuit according to claim 4, wherein the temperature compensation unit includes a first resistor, a second resistor, and a third resistor, the first resistor is connected in parallel with the third resistor, a first end of the first resistor and a first end of the third resistor are connected to the output end of the charge pump unit, the first resistor and a second end of the third resistor are connected to a fourth node, a first end of the second resistor is connected to the fourth node, another end of the second resistor is grounded, the fourth node is connected to the feedback end of the power supply integration unit, and one of the first resistor and the third resistor is a temperature-sensitive resistor.
6. The voltage regulation circuit of claim 1, further comprising:
and the voltage stabilizing unit is connected with the output end of the charge pump unit and is used for being connected with the grid driving circuit.
7. The voltage regulation circuit of claim 6, wherein the voltage regulation unit comprises a RC step-down circuit, the RC step-down circuit comprises a Zener diode, a fourth resistor and a fourth capacitor, a first end of the Zener diode is grounded, a second end of the Zener diode is connected in series with a first end of the fourth resistor, a second end of the fourth resistor is connected to the output end of the charge pump unit, a first end of the fourth capacitor is grounded, and a second end of the fourth capacitor is connected to the output end of the charge pump unit.
8. A method of voltage regulation, the method comprising:
generating an initial reference voltage by using a power supply integration unit;
generating an initial gate voltage based on the initial reference voltage with a charge pump unit;
generating a compensation voltage according to the initial grid voltage by using a voltage compensation unit;
generating a target reference voltage according to the compensation voltage by using the power supply integration unit;
generating, with the charge pump unit, a target gate voltage based on the target reference voltage.
9. The voltage adjustment method of claim 8, wherein generating a compensation voltage based on the initial gate voltage with a voltage compensation unit comprises:
changing the initial gate voltage according to a change in temperature with the voltage compensation unit to generate a compensation voltage.
10. A display device comprising a display panel, a gate driving circuit and the voltage adjusting circuit as claimed in any one of claims 1 to 7, wherein the voltage adjusting circuit is connected to the gate driving circuit, and the gate driving circuit is connected to the display panel or integrated on the display panel.
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| CN202111416586.6A CN114187875A (en) | 2021-11-25 | 2021-11-25 | Voltage adjusting circuit and method and display device |
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| CN202111416586.6A CN114187875A (en) | 2021-11-25 | 2021-11-25 | Voltage adjusting circuit and method and display device |
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