CN112382248B - Drive circuit and display device - Google Patents
Drive circuit and display device Download PDFInfo
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- CN112382248B CN112382248B CN202011233478.0A CN202011233478A CN112382248B CN 112382248 B CN112382248 B CN 112382248B CN 202011233478 A CN202011233478 A CN 202011233478A CN 112382248 B CN112382248 B CN 112382248B
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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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
Abstract
The invention relates to a driving circuit and a display device, comprising a power output module for generating a direct current output voltage according to a direct current input voltage; the direct current common voltage module is used for outputting a direct current common voltage signal according to the direct current output voltage; the alternating current public voltage module is used for outputting an alternating current public voltage signal according to the direct current output voltage; the power output module comprises a control submodule and a plurality of peripheral elements, and the control submodule and the plurality of peripheral elements form a boost power conversion circuit so as to boost a direct current input voltage to obtain a direct current output voltage and perform stable output. The invention generates the DC common voltage and the AC common voltage by the same power supply, so that the time sequences of the power supply of the DC common voltage and the AC common voltage are consistent, the voltage difference between the DC common voltage and the AC common voltage is consistent when the driving circuit is electrified in a transient state, and the stability of the driving circuit is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a driving circuit and a display device.
Background
Liquid Crystal Display (LCD) devices have many advantages such as being light and thin, saving energy, and having no radiation, and thus have gradually replaced conventional Cathode Ray Tube (CRT) Display devices. Liquid crystal display devices are widely used in electronic devices such as high definition digital televisions, desktop computers, Personal Digital Assistants (PDAs), notebook computers, cellular phones, and digital cameras.
In the existing liquid crystal display device, corresponding common voltages are applied to the pixel electrodes and the common electrodes inside to generate corresponding electric fields to control liquid crystal molecules to deflect so as to adjust the transmittance of the liquid crystal layer, thereby realizing image display. In addition, due to the stricter requirements of people in the current society for the application scenarios of the liquid crystal display devices, the existing liquid crystal display devices gradually develop towards the viewing angle switching direction, such as a wide viewing angle mode and a narrow viewing angle mode, and then the viewing angle control electrode for switching the wide viewing angle and the narrow viewing angle also needs to apply a corresponding common voltage to complete the switching of the viewing angle of the display device.
Therefore, the stability of the common voltage driving circuit directly affects the display of the liquid crystal display device and the stability of the screen, such as flicker. The applicant of the present invention finds that in the existing display device with a double-layer liquid crystal cell structure, namely, a display cell and a dimming cell structure, when driving liquid crystal in the dimming cell to control the light transmission direction, a corresponding driving circuit outputs a positive rectangular wave by using a Digital VCOM, outputs a rectangular wave symmetrical in positive and negative voltages after passing through a bias and amplification circuit, and then a module is powered on.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a driving circuit and a display device, which can improve the stability of the driving circuit, and can be used to solve the problem of flicker of power-on transient state of the display device, so as to ensure the quality of image display.
To achieve the above object, a first aspect of embodiments of the present invention provides a driving circuit, which includes, as an implementation manner: the device comprises a power output module, a direct current public voltage module and an alternating current public voltage module. The power output module is used for generating direct current output voltage according to the direct current input voltage. The DC common voltage module is connected with the power output module and used for receiving the DC output voltage and outputting a DC common voltage signal according to the DC output voltage. The alternating current public voltage module is connected with the power output module and used for receiving the direct current output voltage and outputting an alternating current public voltage signal according to the direct current output voltage. The power output module comprises a control submodule and a plurality of peripheral elements, wherein the control submodule and the peripheral elements form a boost power conversion circuit so as to boost the direct current input voltage to obtain the direct current output voltage and perform stable output. The plurality of peripheral elements comprise a first inductor and a first diode which are connected between a power input end and a power output end of the power output module in series, the anode of the first diode is connected with the first inductor, and the middle node of the first inductor and the middle node of the first diode are connected to the control submodule to form a Boost topological structure; a first capacitor connected between the power input terminal and ground; a second capacitor connected between the power supply output terminal and ground; the intermediate node of the first resistor and the second resistor is connected with the control submodule so that the control submodule monitors the direct-current output voltage and performs voltage stabilization output.
As an implementation manner, the power output module further includes a wide and narrow viewing angle control sub-module, and the wide and narrow viewing angle control sub-module is configured to control the power output module to output different dc output voltages according to the wide and narrow viewing angle switching signal. The wide and narrow viewing angle control submodule comprises a third resistor and a first switch element, a first end of the third resistor is connected with a middle node of the first resistor and a middle node of the second resistor, a second end of the third resistor is connected with a first path end of the first switch element, a second path end of the first switch element is grounded, and a control end of the first switch element receives the wide and narrow viewing angle switching signal.
In one embodiment, the resistance of the second resistor is the same as the resistance of the third resistor.
In one embodiment, the first switching element is an NMOS transistor; when the wide and narrow visual angle switching signal is at a high level, the power output module outputs a direct current output voltage which generates a narrow visual angle public voltage; when the wide and narrow visual angle switching signal is at a low level, the power output module outputs a direct current output voltage which generates a wide visual angle public voltage.
As one embodiment, the dc common voltage module includes a fourth resistor, a fifth resistor, and a first voltage follower; the fourth resistor and the fifth resistor are connected in series between the power output end and the ground, the non-inverting input end of the first voltage follower is connected to the middle node of the fourth resistor and the fifth resistor, the inverting input end of the first voltage follower is connected with the output end of the first voltage follower, and the output end of the first voltage follower outputs the direct-current common voltage signal.
In one embodiment, the fourth resistor has the same resistance as the fifth resistor.
As one embodiment, the ac common voltage module includes a sixth resistor, a second switching element, a second voltage follower, and a signal processor; the first end of the sixth resistor is connected with the power output end, the second end of the sixth resistor is connected with the first path end of the second switch element, the second path end of the second switch element is grounded, the control end of the second switch element is connected with the signal processor to receive the square wave signal generated by the signal processor, the non-inverting input end of the second voltage follower is connected with the second end of the sixth resistor, the inverting input end of the second voltage follower is connected with the output end of the second voltage follower, and the output end of the second voltage follower outputs the alternating current public voltage signal.
In one embodiment, the second switching element is an NMOS transistor.
In order to achieve the above object, a second aspect of embodiments of the present invention provides a display device, which includes a display panel and the driving circuit described in any one of the embodiments. Wherein the display panel comprises a first substrate, a first liquid crystal layer, a second substrate, a second liquid crystal layer and a third substrate, the second substrate is positioned between the first substrate and the third substrate, the first liquid crystal layer is clamped between the first substrate and the second substrate to form a first liquid crystal box, the second liquid crystal layer is sandwiched between the second substrate and the third substrate to form a second liquid crystal cell, the first substrate is provided with a first electrode on the side facing the first liquid crystal layer, the second substrate is provided with a second electrode and a third electrode on the side facing the first liquid crystal layer, the second electrode is a pixel electrode, the third electrode is a common electrode, the second substrate faces one side of the second liquid crystal layer and is provided with a fourth electrode, and the third substrate faces one side of the second liquid crystal layer and is provided with a fifth electrode. The direct current public voltage module is used for providing direct current voltage for the fourth electrode, and the alternating current public voltage module is used for providing alternating current voltage for the fifth electrode so as to control deflection of liquid crystals in the second liquid crystal layer.
As one implementation manner, the display device further includes a display control module, and the display control module is configured to generate a wide-narrow viewing angle switching signal according to a user operation.
To sum up, the driving circuit and the display device provided by the embodiment of the present invention are provided with a power output module, a dc common voltage module and an ac common voltage module, wherein the power output module is configured to generate a dc output voltage according to a dc input voltage, the dc common voltage module is connected to the power output module and configured to receive the dc output voltage and output a dc common voltage signal according to the dc output voltage, the ac common voltage module is connected to the power output module and configured to receive the dc output voltage and output an ac common voltage signal according to the dc output voltage, so as to enable the same power supply to generate the dc common voltage and the ac common voltage, enable the time sequence of the power supplies of the dc common voltage module and the ac common voltage module to be consistent, and ensure that the voltage difference between the dc common voltage and the ac common voltage is consistent during the power-on transient state of the driving circuit, the stability of the driving circuit is improved, and the driving circuit can be used for solving the problem of flicker of the power-on transient state of the display device, so that the picture display quality is guaranteed.
Drawings
Fig. 1 is a block diagram showing a driving circuit according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating a specific structure of a driving circuit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram showing a specific structure of a driving circuit according to another embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating a specific structure of a display panel in a display device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer and more complete, the technical solutions of the present invention will be described below with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all, of the embodiments of the present invention, and are only used for explaining the present invention, and are not used to limit the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Reference throughout this patent specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, fig. 1 is a block diagram illustrating a driving circuit according to an embodiment of the invention. As shown in fig. 1, the driving circuit includes: a power output module 10, a dc common voltage module 11 and an ac common voltage module 12. The power output module 10 is configured to generate a dc output voltage according to a dc input voltage. The dc common voltage module 11 is connected to the power output module 10, and is configured to receive the dc output voltage and output a dc common voltage signal DCVCOM according to the dc output voltage. The ac common voltage module 12 is connected to the power output module 10, and is configured to receive the dc output voltage and output an ac common voltage signal ACVCOM according to the dc output voltage. The power output module 10 includes a control submodule U1 and a plurality of peripheral elements, and the control submodule U1 and the plurality of peripheral elements form a boost power conversion circuit to boost a dc input voltage to obtain a dc output voltage and perform stable output. The plurality of peripheral elements comprise a first inductor L1 and a first diode D1 which are connected between a power input end and a power output end of the power output module 10 in series, an anode of the first diode D1 is connected with the first inductor L1, and an intermediate node of the first inductor L1 and the first diode D1 is connected to the control submodule U1 to form a Boost topological structure; a first capacitor C1 connected between the power input terminal and ground; a second capacitor C2 connected between the power supply output terminal and ground; a first resistor R1 and a second resistor R2 connected between the power output terminal and the ground, and the middle node of the first resistor R1 and the second resistor R2 is connected with the control sub-module U1 so that the control sub-module U1 monitors the direct-current output voltage and performs voltage-stabilized output.
Specifically, the invention is based on the idea that the same power supply (power output module 10) is used for generating the dc common voltage and the ac common voltage, so that the time sequences of the power supplies of the dc common voltage module and the ac common voltage module are consistent, the voltage difference between the dc common voltage and the ac common voltage is consistent during the power-on transient state of the driving circuit, and the stability of the driving circuit is improved. In terms of specific structure, in this embodiment, the control sub-module U1 may be a single-chip high-voltage switching boost regulator chip, and the control sub-module U1 and a plurality of peripheral elements form a boost power conversion circuit, which is substantially a single voltage source. The middle node of the first inductor L1 and the first diode D1 is connected to a switch pin (SW) of the control submodule U1 to form a Boost topology, and the middle node of the first resistor R1 and the second resistor R2 is connected to a voltage feedback pin (FB) of the control submodule U1, so that the control submodule U1 monitors the dc output voltage and performs voltage stabilization output on the dc output voltage. It is worth mentioning that the first inductor L1 may be a thin inductor and the first capacitor C1 and the second capacitor C2 may be low value ceramic input and output capacitors, respectively.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a specific structure of a driving circuit according to an embodiment of the invention. As shown in fig. 2, in an embodiment, the dc common voltage module 11 includes a fourth resistor R4, a fifth resistor R5, and a first voltage follower U2. The fourth resistor R4 and the fifth resistor R5 are connected in series between the power output end and the ground, the non-inverting input end of the first voltage follower U2 is connected to the middle node of the fourth resistor R4 and the fifth resistor R5, the inverting input end of the first voltage follower U2 is connected to the output end of the first voltage follower U2, and the output end of the first voltage follower U2 outputs a DC common voltage signal DCVCOM.
Specifically, the voltage follower is a circuit with a gain equal to 1, and the output voltage of the voltage follower follows the input voltage, so that the output impedance of voltage output can be reduced, the driving current is increased, the driving capability is enhanced, and the anti-interference capability is increased, thereby further improving the reliability of voltage output. In this embodiment, the voltage output rear end is a capacitive load, and the current obtained by voltage division only by resistors is insufficient without using a voltage follower, so that the driving capability needs to be improved by the voltage follower.
In one embodiment, the resistance of the fourth resistor R4 is the same as the resistance of the fifth resistor R5.
Specifically, the dc output voltage output by the power output module 10 is divided by the fourth resistor R4 and the fifth resistor R5, and the output voltage is 1/2 of the dc output voltage output by the power output module 10 and is output by the voltage follower U2.
Referring to fig. 2, in an embodiment, the ac-common voltage module 12 includes a sixth resistor R6, a second switch element Q2, a second voltage follower U3, and a signal processor U4. A first end of the sixth resistor R6 is connected to the power output end, a second end of the sixth resistor R6 is connected to the first path end of the second switch element Q2, the second path end of the second switch element Q2 is grounded, a control end of the second switch element Q2 is connected to the signal processor U4 to receive the square wave signal generated by the signal processor U4, a non-inverting input end of the second voltage follower U3 is connected to the second end of the sixth resistor R6, an inverting input end of the second voltage follower U3 is connected to the output end of the second voltage follower U3, and an output end of the second voltage follower U3 outputs the ac common voltage signal ACVCOM.
Specifically, the square wave signal generated by the signal processor U4 periodically turns on the second switching element Q2, so that the non-inverting input terminal of the second voltage follower U3 periodically changes between high level and low level (ground GND), thereby outputting the ac common voltage ACVCOM. Preferably, the voltage value of the dc common voltage DCVCOM is 1/2 of the voltage value of the ac common voltage ACVCOM, so that the voltage difference applied to the liquid crystal is a voltage difference having positive and negative symmetry.
In one embodiment, the second switching element is an NMOS transistor.
Specifically, the second switching element is not limited to an NMOS transistor, and may also be a PMOS transistor or other switching elements, and those skilled in the art may select different switching elements according to the type of the control signal.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a specific structure of a driving circuit according to another embodiment of the invention. As shown in fig. 3, in an embodiment, the power output module 10 further includes a wide and narrow viewing angle control sub-module 110, and the wide and narrow viewing angle control sub-module 110 is configured to control the power output module 10 to output different dc output voltages according to the wide and narrow viewing angle switching signal HVA. The wide-narrow viewing angle control sub-module 110 includes a third resistor R3 and a first switch element Q1, a first end of the third resistor R3 is connected to a middle node of the first resistor R1 and the second resistor R2, a second end of the third resistor R3 is connected to a first path end of the first switch element Q1, a second path end of the first switch element Q1 is grounded, a control end of the first switch element Q1 receives a wide-narrow viewing angle switching signal HVA, and the first switch element Q1 is turned on or turned off according to the wide-narrow viewing angle switching signal HVA, so that output of two dc output voltages with different magnitudes is achieved.
In one embodiment, the resistance of the second resistor R2 is the same as the resistance of the third resistor R3.
Specifically, the resistance of the second resistor R2 is the same as that of the third resistor R3 only as a preferred embodiment as long as two voltage outputs can be realized.
In one embodiment, the first switching element is an NMOS transistor. When the wide-narrow viewing angle switching signal HVA is at a high level, the power output module 10 outputs a dc output voltage that generates a narrow viewing angle common voltage; when the wide-narrow viewing angle switching signal HVA is at a low level, the power output module 10 outputs a dc output voltage that generates a wide viewing angle common voltage.
Specifically, the first switch element is not limited to an NMOS transistor, and may also be another switch element such as a PMOS transistor and a triode, in this embodiment, when the wide and narrow viewing angle switching signal HVA is at a high level, the NMOS transistor is turned on, and the power output module 10 outputs a dc output voltage that generates the narrow viewing angle common voltage; when the wide-narrow viewing angle switching signal HVA is at a low level, the NMOS transistor is turned off, and the power output module 10 outputs a dc output voltage that generates a wide viewing angle common voltage.
To sum up, the driving circuit provided in the embodiment of the present invention is provided with a power output module, a dc common voltage module and an ac common voltage module, wherein the power output module is configured to generate a dc output voltage according to a dc input voltage, the dc common voltage module is connected to the power output module and configured to receive the dc output voltage and output a dc common voltage signal according to the dc output voltage, the ac common voltage module is connected to the power output module and configured to receive the dc output voltage and output an ac common voltage signal according to the dc output voltage, so as to enable the same power supply to generate the dc common voltage and the ac common voltage, enable the time sequence of the power supplies of the dc common voltage module and the ac common voltage module to be consistent, and ensure that the voltage difference between the dc common voltage and the ac common voltage is consistent during the power-on transient state of the driving circuit, the stability of the driving circuit is improved, and the driving circuit can be used for solving the problem of flicker of the power-on transient state of the display device, so that the picture display quality is guaranteed.
In an embodiment, the display device includes a display panel and the driving circuit of any of the foregoing embodiments. Referring to fig. 1 and fig. 4, fig. 4 is a schematic diagram illustrating a specific structure of a display panel in a display device according to an embodiment of the present invention. As shown in fig. 4, in one embodiment, the display panel includes a first substrate 40, a first liquid crystal layer 41, a second substrate 42, a second liquid crystal layer 43, and a third substrate 44, the second substrate 42 is located between the first substrate 40 and the third substrate 44, the first liquid crystal layer is sandwiched between the first substrate 40 and the second substrate 42 to form a first liquid crystal cell, the second liquid crystal layer is sandwiched between the second substrate 42 and the third substrate 44 to form a second liquid crystal cell, the first substrate 40 is provided with a first electrode 45 on a side facing the first liquid crystal layer, the second substrate 42 is provided with a second electrode 46 and a third electrode 47 on a side facing the first liquid crystal layer, the second electrode 46 is a pixel electrode, the third electrode 47 is a common electrode, the second substrate 42 is provided with a fourth electrode 48 on a side facing the second liquid crystal layer, and the third substrate 44 is provided with a fifth electrode 49 on a side facing the second liquid crystal layer. The dc common voltage module 11 is used for providing a dc voltage to the fourth electrode 48, and the ac common voltage module 12 is used for providing an ac voltage to the fifth electrode 49 to control the deflection of the liquid crystal in the second liquid crystal layer.
Specifically, the display panel in this embodiment is a display panel with switchable viewing angles, and has two liquid crystal cells, namely a first liquid crystal cell (display cell) and a second liquid crystal cell (dimming cell), in this embodiment, the driving circuit is configured to provide a driving voltage for the second liquid crystal cell, namely, the dc common voltage module 11 is configured to provide a dc voltage for the fourth electrode 48, and the ac common voltage module 12 is configured to provide an ac voltage for the fifth electrode 49, so as to control the deflection of the liquid crystal in the second liquid crystal layer, and achieve the purpose of controlling the light transmission direction, thereby achieving wide and narrow viewing angle display. For example, a first dc common voltage is applied to the third electrode 47, the same dc voltage as the first dc common voltage is applied to the first electrode 45, and the voltage difference between the first electrode 45 and the third electrode 47 is 0V, so that the negative liquid crystal in the first liquid crystal layer 41 maintains an initial small tilt angle, and the first liquid crystal cell displays a wide viewing angle. When a large voltage difference exists between the fourth electrode 48 and the fifth electrode 49, a vertical electric field E is generated in the second liquid crystal cell, and the negative liquid crystal in the second liquid crystal layer 43 is deflected to a small tilt angle by the vertical electric field E, and the second liquid crystal cell displays a wide viewing angle. At this time, the display device operates in a wide viewing angle mode. The fourth electrode 48 can apply the same dc common voltage DCVCOM as the first dc common voltage, the fifth electrode 49 preferably applies the periodic ac common voltage ACVCOM which fluctuates up and down around the dc common voltage DCVCOM (i.e. the potential symmetry center of the ac common voltage ACVCOM is the dc common voltage DCVCOM), and the voltage difference between the fourth electrode 48 and the fifth electrode 49 is positive-negative symmetric, so that the direction of the vertical electric field E generated in the second liquid crystal cell is varied back and forth, and the negative liquid crystal in the second liquid crystal layer 43 is prevented from being polarized by applying the same direction of electric field all the time. Accordingly, another set of ac common voltage ACVCOM and dc common voltage DCVCOM is provided when a narrow viewing angle is achieved, except for the voltage amplitude. The principle of switching between wide and narrow viewing angles is the prior art and is not described herein again.
It should be noted that, because the dc common voltage and the ac common voltage are generated by the same power supply, the time sequences of the power supplies of the dc common voltage module 11 and the ac common voltage module 12 are consistent, so that the voltage difference between the dc common voltage and the ac common voltage is consistent when the driving circuit is powered on, and the voltage applied to the liquid crystal in the second liquid crystal cell is always 0V in the power-on process, thereby preventing the flicker problem.
In an embodiment, the display apparatus further includes a display control module, and the display control module is configured to generate the wide and narrow viewing angle switching signal HVA according to a user operation.
It should be noted that the display panel of the double-layer liquid crystal cell also has various other varied structures, which do not affect the application of the driving circuit in the embodiment of the present invention, and the driving circuit in the present invention can be adapted to the display panel of the double-layer liquid crystal cell structure with each varied structure, so as to provide a driving voltage without abnormal fluctuation.
To sum up, the display device provided by the embodiment of the present invention is provided with a power output module, a dc common voltage module and an ac common voltage module, wherein the power output module is configured to generate a dc output voltage according to a dc input voltage, the dc common voltage module is connected to the power output module and configured to receive the dc output voltage and output a dc common voltage signal according to the dc output voltage, the ac common voltage module is connected to the power output module and configured to receive the dc output voltage and output an ac common voltage signal according to the dc output voltage, so as to enable the same power supply to generate the dc common voltage and the ac common voltage, enable the time sequence of the power supplies of the dc common voltage module and the ac common voltage module to be consistent, and ensure that the voltage difference between the dc common voltage and the ac common voltage is consistent during the power-on transient state of the driving circuit, the stability of the driving circuit is improved, and the driving circuit can be used for solving the problem of flicker of the power-on transient state of the display device, so that the picture display quality is guaranteed.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. The various features described in the foregoing detailed description may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (9)
1. A driver circuit, comprising:
the power output module is used for generating direct current output voltage according to the direct current input voltage;
the direct current common voltage module is connected with the power output module and used for receiving the direct current output voltage and outputting a direct current common voltage signal according to the direct current output voltage;
the alternating current public voltage module is connected with the power output module and used for receiving the direct current output voltage and outputting an alternating current public voltage signal according to the direct current output voltage;
the power output module comprises a control submodule and a plurality of peripheral elements, wherein the control submodule and the peripheral elements form a boost power conversion circuit so as to boost the direct-current input voltage to obtain the direct-current output voltage and perform stable output; wherein the content of the first and second substances,
the plurality of peripheral elements comprise a first inductor and a first diode which are connected between a power input end and a power output end of the power output module in series, the anode of the first diode is connected with the first inductor, and the middle node of the first inductor and the middle node of the first diode are connected to the control submodule to form a Boost topological structure; a first capacitor connected between the power input terminal and ground; a second capacitor connected between the power supply output terminal and ground; the intermediate node of the first resistor and the second resistor is connected with the control submodule so that the control submodule monitors the direct-current output voltage and performs voltage stabilization output;
the power output module also comprises a wide and narrow visual angle control sub-module, and the wide and narrow visual angle control sub-module is used for controlling the power output module to output different direct current output voltages according to the wide and narrow visual angle switching signal; the wide and narrow viewing angle control submodule comprises a third resistor and a first switch element, a first end of the third resistor is connected with a middle node of the first resistor and a middle node of the second resistor, a second end of the third resistor is connected with a first path end of the first switch element, a second path end of the first switch element is grounded, and a control end of the first switch element receives the wide and narrow viewing angle switching signal.
2. The driving circuit according to claim 1, wherein the second resistor has the same resistance as the third resistor.
3. The driving circuit according to claim 1, wherein the first switching element is an NMOS transistor; wherein the content of the first and second substances,
when the wide and narrow visual angle switching signal is at a high level, the power output module outputs a direct current output voltage which generates a narrow visual angle public voltage;
when the wide and narrow visual angle switching signal is at a low level, the power output module outputs a direct current output voltage which generates a wide visual angle public voltage.
4. The driving circuit according to claim 1, wherein the dc common voltage module comprises a fourth resistor, a fifth resistor, and a first voltage follower; wherein the content of the first and second substances,
the fourth resistor and the fifth resistor are connected in series between the power output end and the ground, the non-inverting input end of the first voltage follower is connected to the middle node of the fourth resistor and the fifth resistor, the inverting input end of the first voltage follower is connected with the output end of the first voltage follower, and the output end of the first voltage follower outputs the direct-current common voltage signal.
5. The driving circuit according to claim 4, wherein the fourth resistor has the same resistance as the fifth resistor.
6. The driving circuit according to claim 1, wherein the ac common voltage module includes a sixth resistor, a second switching element, a second voltage follower, and a signal processor; wherein the content of the first and second substances,
the first end of the sixth resistor is connected with the power output end, the second end of the sixth resistor is connected with the first path end of the second switch element, the second path end of the second switch element is grounded, the control end of the second switch element is connected with the signal processor to receive the square wave signal generated by the signal processor, the non-inverting input end of the second voltage follower is connected with the second end of the sixth resistor, the inverting input end of the second voltage follower is connected with the output end of the second voltage follower, and the output end of the second voltage follower outputs the alternating current public voltage signal.
7. The driving circuit according to claim 6, wherein the second switching element is an NMOS transistor.
8. A display device comprising a display panel and the driver circuit according to any one of claims 1 to 7, wherein the display panel comprises a first substrate, a first liquid crystal layer, a second substrate, a second liquid crystal layer, and a third substrate, the second substrate is located between the first substrate and the third substrate, the first liquid crystal layer is sandwiched between the first substrate and the second substrate to form a first liquid crystal cell, the second liquid crystal layer is sandwiched between the second substrate and the third substrate to form a second liquid crystal cell, the first substrate is provided with a first electrode on a side facing the first liquid crystal layer, the second substrate is provided with a second electrode and a third electrode on a side facing the first liquid crystal layer, the second electrode is a pixel electrode, the third electrode is a common electrode, the second substrate is provided with a fourth electrode on a side facing the second liquid crystal layer, a fifth electrode is arranged on one side, facing the second liquid crystal layer, of the third substrate; wherein the content of the first and second substances,
the DC common voltage module is used for providing DC voltage for the fourth electrode, and the AC common voltage module is used for providing AC voltage for the fifth electrode so as to control the deflection of the liquid crystal in the second liquid crystal layer.
9. The display device according to claim 8, further comprising a display control module configured to generate the wide-narrow viewing angle switching signal according to a user operation.
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