CN114842796B

CN114842796B - Display driving circuit and display device

Info

Publication number: CN114842796B
Application number: CN202210332594.0A
Authority: CN
Inventors: 张强; 董殿正; 王光兴; 梁海涵; 倪秀伟; 张新宇; 李绚; 谢丹
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2023-11-24
Anticipated expiration: 2042-03-30
Also published as: CN114842796A

Abstract

A display driving circuit and a display device are provided, and belong to the technical field of display. In the display driving circuit, the power supply circuit can transmit various alternative power supply signals with different potentials to the switching circuit, the control circuit can transmit various target switching control signals with different potentials to the switching circuit, and the switching circuit can transmit one alternative power supply signal to the voltage conversion circuit in a period under the control of the various target switching control signals so as to adjust the driving signals to be transmitted to the grid driving circuit based on the alternative power supply signals, thereby controlling the grid driving circuit to drive the pixels to emit light. Therefore, the alternative power supply signal transmitted to the voltage conversion circuit can be flexibly adjusted according to the refresh rate, so that the driving signal transmitted to the gate driving circuit can be flexibly adjusted by the driving voltage conversion circuit, the gate driving circuit can reliably drive the pixels to emit light based on the adjusted driving signal, and the display effect of the display device is good.

Description

Display driving circuit and display device

Technical Field

The disclosure relates to the field of display technologies, and in particular, to a display driving circuit and a display device.

Background

The display device generally includes a display driving circuit, a gate driving circuit, and a plurality of rows of pixels. The display driving circuit is coupled with the grid driving circuit, and the grid driving circuit is coupled with a plurality of rows of pixels. The display driving circuit is used for transmitting driving signals to the gate driving circuit so that the gate driving circuit scans a plurality of rows of pixels line by line.

In the related art, a display driving circuit generally includes: a timing controller (timing controller, TCON), a voltage shift (L/S) circuit, and a Direct Current (DC) -DC power circuit. Both TCON and DCDC circuits are coupled to L/S circuitry, which is also coupled to gate drive circuitry. The TCON is used for transmitting an alternative signal to the L/S circuit based on the received image to be displayed, the DCDC circuit is used for transmitting a direct current power supply signal with a certain potential to the L/S circuit based on the received input power supply signal, and the L/S circuit is used for converting the alternative signal into a driving signal based on the direct current power supply signal and then transmitting the driving signal to the grid driving circuit. In order to meet the requirement of high refresh rate, the potential of the dc power signal is generally large.

However, once the display device operates at a low refresh rate, the driving signal converted based on the dc power signal with a larger potential may cause a larger leakage difference between different transistors in the gate driving circuit, thereby resulting in a poor display effect of the display device.

Disclosure of Invention

The embodiment of the disclosure provides a display driving circuit and a display device, which can solve the problem of poor display effect of the display device in the related art. The technical scheme is as follows:

in one aspect, there is provided a display driving circuit including: a power supply circuit, a control circuit, a switching circuit and a voltage conversion circuit;

the power supply circuit is respectively coupled with an input power supply end, the control circuit and the switch circuit, and is used for transmitting a power supply signal to the control circuit and transmitting at least two alternative power supply signals with different potentials to the switch circuit based on an input power supply signal provided by the input power supply end;

the control circuit is further coupled with the switching circuit and the voltage conversion circuit respectively, and is used for acquiring a picture to be displayed, transmitting alternative driving signals to the voltage conversion circuit based on the picture to be displayed, and transmitting at least two target switching control signals with different potentials to the switching circuit;

the switching circuit is further coupled to the voltage conversion circuit, and is configured to transmit one of the at least two alternative power supply signals to the voltage conversion circuit during a period of time in response to the at least two target switching control signals;

The voltage conversion circuit is used for being coupled with the grid driving circuit, the voltage conversion circuit is used for converting the alternative driving signal into a target driving signal based on the target alternative power supply signal and then transmitting the target driving signal to the grid driving circuit so that the grid driving circuit drives the coupled multiple rows of pixels to emit light based on the target driving signal, and the target driving signal is different from the potential amplitude of the alternative driving signal.

Optionally, the power supply circuit includes: a direct current, DCDC, converter and at least two charge pumps;

the direct current (DCDC) converter is respectively coupled with the input power supply end and the control circuit and is used for transmitting the power supply signal to the control circuit based on the input power supply signal;

each charge pump is respectively coupled with the input power supply end and the switch circuit, each charge pump is used for transmitting an alternative power supply signal to the switch circuit based on the input power supply signal, and the potential of the alternative power supply signal transmitted by each charge pump is different in the at least two charge pumps.

Optionally, the switching circuit includes: at least two switching transistors;

The gates of the at least two switching transistors are coupled to the control circuit, the first poles of the at least two switching transistors are coupled to the power supply circuit, and the second poles of the at least two switching transistors are coupled to the voltage conversion circuit.

Optionally, the display driving circuit further includes: and the isolation diode is connected in series between the second pole of each switching transistor and the voltage conversion circuit, and is used for isolating the second pole of the switching transistor from the voltage conversion circuit.

Optionally, the control circuit includes: a control sub-circuit and a voltage conversion sub-circuit;

the power supply circuit is coupled with the voltage conversion sub-circuit and is used for transmitting a power supply signal to the voltage conversion sub-circuit based on the input power supply signal;

the control sub-circuit is respectively coupled with the voltage conversion circuit and the voltage conversion sub-circuit, and is used for receiving the picture to be displayed, transmitting the alternative driving signal to the voltage conversion circuit and transmitting at least two alternative switch control signals with different potentials to the voltage conversion sub-circuit based on the picture to be displayed;

The voltage conversion sub-circuit is further coupled with the switch circuit, and the voltage conversion sub-circuit is used for converting the at least two alternative switch control signals into the at least two target switch control signals in a one-to-one correspondence mode and then transmitting the at least two target switch control signals to the switch circuit.

Optionally, the power supply circuit is configured to transmit a first alternative power supply signal and a second alternative power supply signal to the switching circuit; the control sub-circuit includes: a timing controller and an inverter;

the time schedule controller is respectively coupled with the voltage conversion circuit, the inverter and the voltage conversion sub-circuit, and is used for receiving a picture to be displayed, transmitting the alternative driving signal to the voltage conversion circuit and transmitting a first alternative switch control signal to the inverter and the voltage conversion sub-circuit based on the picture to be displayed;

the inverter is further coupled to the voltage conversion sub-circuit, and is configured to invert the first alternative switch control signal to obtain a second alternative switch control signal, and transmit the second alternative switch control signal to the voltage conversion sub-circuit;

the voltage conversion sub-circuit is used for converting the first alternative switch control signal into a first target switch control signal and then transmitting the first target switch control signal to the switch circuit, and converting the second alternative switch control signal into a second target switch control signal and then transmitting the second target switch control signal to the switch circuit;

The switching circuit is configured to transmit the first alternative power supply signal or the second alternative power supply signal to the voltage conversion circuit in response to the first target switching control signal and the second target switching control signal.

Optionally, the potential of the first alternative power supply signal is greater than the potential of the second alternative power supply signal;

the timing controller is configured to determine a refresh rate based on the picture to be displayed, and is further configured to:

when the refresh rate is greater than a refresh rate threshold, transmitting a first alternative switch control signal of a first potential to the voltage conversion sub-circuit, wherein the inverter is used for inverting the first alternative switch control signal of the first potential to obtain a second alternative switch control signal of a second potential, transmitting the second alternative switch control signal of the second potential to the voltage conversion sub-circuit, and the voltage conversion sub-circuit is used for converting the first alternative switch control signal of the first potential into a first target switch control signal of the first potential, transmitting the first alternative switch control signal to the switching circuit, converting the second alternative switch control signal of the second potential into a second target switch control signal of the second potential, and transmitting the first alternative power supply signal to the voltage conversion circuit in response to the first target switch control signal of the first potential and the second target switch control signal of the second potential;

When the refresh rate is smaller than the refresh rate threshold, a first alternative switch control signal of a second potential is transmitted to the voltage conversion sub-circuit, the inverter is used for inverting the first alternative switch control signal of the second potential to obtain the second alternative switch control signal of the first potential, the second alternative switch control signal of the first potential is transmitted to the voltage conversion sub-circuit, the voltage conversion sub-circuit is used for converting the first alternative switch control signal of the second potential into a first target switch control signal of the second potential and then transmitting the first alternative switch control signal of the first potential to the switch circuit, and the switch circuit is used for responding to the first target switch control signal of the second potential and the second target switch control signal of the first potential and then transmitting the second alternative power supply signal to the voltage conversion circuit.

Optionally, the power supply circuit includes: two charge pumps; the switching circuit includes: two switching transistors;

the two charge pumps are coupled with the input power supply end, the two charge pumps are also coupled with first poles of the two switching transistors in a one-to-one correspondence mode, grid electrodes of the two switching transistors are coupled with the voltage conversion subcircuit, and second poles of the two switching transistors are coupled with the voltage conversion circuit.

Optionally, the power supply circuit is further configured to transmit at least two common power supply signals of different potentials to the plurality of rows of pixels;

wherein the at least two common power signals are in one-to-one correspondence with the at least two alternative power signals.

In another aspect, there is provided a display device including: a plurality of rows of pixels, a gate driving circuit, and a display driving circuit as described in the above aspect;

the display driving circuit is coupled with the grid driving circuit and is used for transmitting driving signals to the grid driving circuit;

the gate driving circuit is further coupled to the plurality of rows of pixels, and is configured to transmit gate driving signals to the plurality of rows of pixels based on the driving signals, so as to drive the plurality of rows of pixels to emit light.

In summary, the beneficial effects brought by the technical solution provided by the embodiments of the present disclosure at least may include:

a display driving circuit and a display device are provided. In the display driving circuit, the power supply circuit can transmit various alternative power supply signals with different potentials to the switching circuit, the control circuit can transmit various target switching control signals with different potentials to the switching circuit, and the switching circuit can transmit one alternative power supply signal to the voltage conversion circuit in a period under the control of the various target switching control signals so as to adjust the driving signals to be transmitted to the grid driving circuit based on the alternative power supply signals, thereby controlling the grid driving circuit to drive the pixels to emit light. Therefore, the alternative power supply signal transmitted to the voltage conversion circuit can be flexibly adjusted according to the refresh rate, so that the driving signal transmitted to the gate driving circuit can be flexibly adjusted by the driving voltage conversion circuit, the gate driving circuit can reliably drive the pixels to emit light based on the adjusted driving signal, and the display effect of the display device is good.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of a horizontal black line problem provided by an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a display panel with a horizontal black line;

fig. 3 is a schematic structural diagram of a display driving circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of another display driving circuit according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a display driving circuit according to another embodiment of the present disclosure;

fig. 6 is a schematic diagram of a display driving circuit provided in an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a method for improving the horizontal black line problem provided by embodiments of the present disclosure;

FIG. 8 is a schematic diagram of a product for improving the horizontal black line problem provided by an embodiment of the present disclosure;

FIG. 9 is a switching waveform diagram of an alternative power supply signal provided by an embodiment of the present disclosure;

FIG. 10 is a graph of a relationship between a common power signal and an alternative power signal provided by an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in further detail below with reference to the accompanying drawings.

Currently, both conventional liquid crystal display (liquid crystal display, LCD) products and new organic light-emitting diode (OLED) display products use a gate driving circuit to scan and drive a plurality of rows of pixels (pixels) included in a display panel (panel) row by row, so that the display panel completes display. Since the gate driving circuit is currently disposed on the array substrate included in the display panel in multiple integration, it may also be called an array substrate row driving (gate driver on array, GOA) circuit. For example, the GOA circuit may be coupled to a display driving circuit disposed at the periphery of the display panel, and may be coupled to a plurality of rows of pixels through a plurality of gate lines. The GOA circuit may be configured to receive a plurality of driving signals transmitted by the display driving circuit, and sequentially apply an on voltage for controlling an operation or an off voltage for controlling an non-operation of a pixel circuit in a pixel to the plurality of gate lines under the driving of the plurality of driving signals, so that the pixel circuit may be turned on row by row, and the pixel circuit may further transmit a light emission driving voltage to the light emitting element in the pixel to drive the light emitting element to emit light, i.e., light the light emitting element. Wherein the on voltage and the off voltage may be referred to as gate driving signals. It can also be determined that the turning on or off of the pixel circuits in each row of pixels is mainly achieved by means of a turn-on voltage or turn-off voltage applied by the GOA circuit to the gate line to which it is coupled, which may also be referred to as a row turn-on voltage.

However, an etching process, abbreviated as SD or CD etching process, is inevitably employed in manufacturing the display product. Through tests, the process fluctuation of the etching process easily causes obvious leakage difference of each transistor in the GOA circuit, the leakage is generally reflected on the off current (Ioff) of the transistor, and the leakage difference is particularly obvious when the display product displays a pure-color picture at a low refresh rate. The leakage difference is finally reflected in each Pixel, the Pixel circuit is driven by the gate driving signal to generate deviation of the light-emitting driving voltage (Pixel voltage for short) transmitted to the light-emitting element, so that the display panel has uneven brightness, and the display panel is in a visible horizontal line when serious, and is particularly obvious in low gray scale.

For example, referring to fig. 1, when the process error of the SD or CD etching process is larger, the Ioff of each transistor in the GOA circuit is increased, further, the potential of the pull-up node PU in the GOA circuit is kept to be poor, and finally, the Pixel voltage transmitted to the light emitting element by the Pixel circuit driven by the gate driving signal transmitted by the GOA circuit is lower, so that the display panel appears as a horizontal black line as shown in fig. 2. The pull-up node PU refers to a node coupled to the gate of an output transistor in the GOA circuit that ultimately outputs a gate drive signal.

In order to ensure that the pixel circuit is sufficiently turned on, it is generally necessary to control the display driving circuit to transmit a driving signal having a high potential amplitude (which may be represented by VGH) to the GOA circuit. And, with display products with high refresh rates (e.g., game-like display products) increasingly occupying the mainstream share of the market, the higher the refresh rate, the shorter the actual charging time left for the pixel circuit. In order to increase the charging speed at the refresh rate, it is also common practice to increase the potential amplitude of the driving signal transmitted from the display driving circuit to the GOA circuit. However, once the display product is operating at a low frequency (i.e., low refresh rate), an excessively high VGH may further cause the leakage difference of the individual transistors in the GOA circuit to become large, thereby aggravating the severity of the horizontal line. And, this type of poor display problem can manifest itself as a persistent presence of periodic uncertainty, which is generally difficult to completely eliminate. It can also be seen that the GOA circuit requires different VGH at different refresh rates.

Based on this, the embodiments of the present disclosure provide a new display driving circuit, which can flexibly adjust the potential amplitude of the driving signal transmitted to the GOA circuit according to the picture to be displayed, so as to improve the above-mentioned display failure problem of the display device.

For example, the display driving circuit can turn down VGH when determining that the display product is in a low refresh rate working state according to the picture to be displayed; and when the display product is determined to be in the high refresh rate working state according to the picture to be displayed, the VGH is regulated up. Assuming that the VGH corresponding to the high refresh rate is the original VGH, it may be considered that the original VGH is maintained unchanged when it is determined that the display product is in the high refresh rate operation state, and the original VGH is turned down once it is detected that the display product is switched from the high refresh rate operation state to the low refresh rate operation state.

Fig. 3 is a schematic structural diagram of a display driving circuit according to an embodiment of the disclosure. As shown in fig. 3, the display driving circuit 00 includes: a power supply circuit 01, a control circuit 02, a switching circuit 03, and a voltage converting circuit (i.e., an L/S circuit) 04.

The power circuit 01 is coupled to the input power terminal VIN, the control circuit 02 and the switch circuit 03, respectively. The power supply circuit 01 is configured to transmit a power supply signal VGHC to the control circuit 02 and at least two alternative power supply signals VGH1 … VGHN of different potentials to the switch circuit 03 based on an input power supply signal provided from the input power supply terminal VIN. N may be an integer greater than 1.

For example, the power supply circuit 01 may have one input terminal and a plurality of output terminals. The control circuit 02 may have a power supply terminal. The switching circuit 03 may have a plurality of inputs. The input terminal of the power circuit 01 may be coupled to the input power terminal VIN, one of the output terminals of the power circuit 01 may be coupled to the power terminal of the control circuit 02, and the other output terminals may be coupled to the input terminals of the switch circuit 03 in a one-to-one correspondence. The power supply circuit 01 may boost the input power signal provided by the input power terminal VIN to a power supply signal VGHC, and transmit the power supply signal VGHC to the control circuit 02 via an output terminal coupled to a power terminal of the control circuit 02, so as to supply power to the control circuit 02 and drive the control circuit 02 to operate. And, the power circuit 01 may boost the input power signal into at least two alternative power signals VGH1 … VGHN, and then transmit the at least two alternative power signals to the switch circuit 03 through a plurality of output terminals coupled to a plurality of input terminals of the switch circuit 03 in a one-to-one correspondence manner. In other words, the switching circuit 03 may receive the at least two alternative power supply signals VGH1 … VGHN.

As is clear from the foregoing description of the embodiments, in the embodiments of the present disclosure, the potential of the power supply signal VGHC and the potential of each of the alternative power supply signals may be greater than the potential of the input power supply signal. Also, in some embodiments, the potential of the power supply signal VGHC may be less than the potential of the alternative power supply signal.

The control circuit 02 is also coupled to the switching circuit 03 and the voltage conversion circuit 04, respectively. The control circuit 02 is configured to acquire a picture to be displayed, and transmit an alternative driving signal GOAI to the voltage conversion circuit 04 based on the picture to be displayed, and transmit at least two target switch control signals VCH1 … VCHN with different potentials to the switch circuit 03.

For example, the control circuit 02 may also have an input and a plurality of outputs. The switching circuit 03 may also have a plurality of control terminals. The input of the control circuit 02 may be coupled to a communication interface, which may be generally considered as the input of the control circuit 02, i.e. the control circuit 02 has the communication interface. The control circuit 02 may receive a screen to be displayed from the communication interface, where the screen to be displayed may refer to one image or may refer to a video including a plurality of images.

One of the plurality of output terminals of the control circuit 02 may be coupled to the voltage converting circuit 04, and the remaining output terminals may be coupled to the plurality of control terminals of the switching circuit 03 in a one-to-one correspondence. The control circuit 02 may generate an alternative driving signal GOAI based on the picture to be displayed and transmit the alternative driving signal GOAI to the voltage converting circuit 04 via an output coupled to the voltage converting circuit 04. And, the control circuit 02 may generate at least two target switch control signals VCH1 … VCHN based on the frame to be displayed, and transmit the at least two target switch control signals VCH1 … VCHN to the switch circuit 03 through a plurality of output terminals coupled to a plurality of control terminals of the switch circuit 03 in a one-to-one correspondence manner, so as to control the working state of the switch circuit 03. In other words, the switching circuit 03 may receive the at least two target switching control signals VCH1 … VCHN. The voltage conversion circuit 04 may receive an alternative driving signal GOAI.

Alternatively, as shown in fig. 3, the communication interface described in the embodiment of the present disclosure may be an embedded display interface (embedded display port, eDP). And, the alternative drive signal may be a pulse signal, i.e., the alternative drive signal may have a pulse period and a pulse frequency, and may have a low level and a high level.

The switching circuit 03 is also coupled to the voltage conversion circuit 04. The switching circuit 03 is configured to transmit one target alternative power supply signal VGHn of the at least two alternative power supply signals to the voltage conversion circuit 04 within one period in response to at least two target switching control signals VCH1 … VCHN. Wherein N may be an integer of 1 or more and N or less.

For example, the switching circuit 03 may also have a plurality of outputs, and the plurality of outputs of the switching circuit 03 may be coupled to the voltage conversion circuit 04. The switching circuit 03 may transmit only one target alternative power supply signal VGHN among at least two alternative power supply signals VGH1 … VGHN, which are received by a plurality of input terminals thereof, to the voltage converting circuit 04 in response to potentials of at least two target switching control signals, which are received by the plurality of control terminals thereof, respectively. In other words, the voltage conversion circuit 04 may also receive the target alternative power supply signal VGHn.

As can be seen from the foregoing description of the embodiments, in the embodiments of the present disclosure, at least two target switch control signals VCH1 … VCHN may correspond to at least two alternative power supply signals VGH1 … VGHN one by one. That is, in a period (e.g., one frame), only the potential of one target switch control signal may be the first potential, the potentials of the remaining target switch control signals may be the second potential, and the switching circuit 03 may transmit the candidate power supply signal corresponding to the target switch control signal of the first potential as the target candidate power supply signal VGHn to the voltage conversion circuit 04 under the driving of the target switch control signal of the first potential.

Alternatively, the first potential may be an active potential, the second potential may be an inactive potential, and the first potential may be a high potential with respect to the second potential.

The voltage conversion circuit 04 is also used to couple with a gate drive circuit (i.e., GOA circuit). The voltage conversion circuit 04 is configured to convert the candidate driving signal GOAI into a target driving signal GOAO based on the target candidate power signal VGHn, and transmit the target driving signal GOAO to the GOA circuit, so that the GOA circuit drives the coupled rows of pixels to emit light based on the target driving signal GOAO.

The potential amplitude of the target driving signal GOAO after conversion is different from the potential amplitude of the candidate driving signal GOAI before conversion, and other parameters (such as type, period and frequency) except the potential amplitude are the same. The potential amplitude of the general target drive signal GOAO is greater than the potential amplitude of the alternative drive signal GOAI. For example, the alternative drive signal voltage conversion circuit 04 may boost the potential amplitude of the alternative drive signal GOAI to the potential of the target alternative power signal VGHn based on the target alternative power signal VGHn.

Alternatively, as known based on the working principle of the GOA circuit, the target driving signal GOAO may include: clock signal CLK, on signal STV and other control signals. As described in the above embodiments, the alternative driving signal GOAI also includes these signals as well. The GOA circuit can reliably work based on the target driving signal GOAO, and the gate driving signal is transmitted to the pixels in a plurality of rows through a plurality of gate lines, so that the pixels in the plurality of rows are lighted row by row, and row scanning is achieved.

In summary, the embodiments of the present disclosure provide a display driving circuit, in which a power supply circuit may transmit multiple alternative power supply signals with different potentials to a switching circuit, a control circuit may transmit multiple target switch control signals with different potentials to the switching circuit, and the switching circuit may transmit an alternative power supply signal to a voltage conversion circuit in a period under the control of the multiple target switch control signals, so that the voltage conversion circuit adjusts a driving signal to be transmitted to a gate driving circuit based on the alternative power supply signal, thereby controlling the gate driving circuit to drive a plurality of rows of pixels to emit light. Therefore, the alternative power supply signal transmitted to the voltage conversion circuit can be flexibly adjusted according to the refresh rate, so that the driving signal transmitted to the gate driving circuit can be flexibly adjusted by the driving voltage conversion circuit, the gate driving circuit can reliably drive the pixels to emit light based on the adjusted driving signal, and the display effect of the display device is good.

Optionally, fig. 4 is a schematic structural diagram of another display driving circuit according to an embodiment of the disclosure. As can be seen with reference to fig. 4, the power supply circuit 01 described in the embodiment of the present disclosure may include: a dc-dc converter 011 and at least two charge pumps 012.

The dc-dc converter 011 may be coupled to the input power terminal VIN and the control circuit 02, respectively. The dc-dc converter 011 can be used to transmit the power supply signal VGHC to the control circuit 02 based on the input power supply signal.

For example, referring to fig. 4, the direct current DCDC converter 011 may have one input and one output. An input of the dc-dc converter 011 may be coupled to the input power supply VIN, and an output of the dc-dc converter 011 may be coupled to a power supply of the control circuit 02. The dc-dc converter 011 may boost the input power signal into the power supply signal VGHC, and transmit the power supply signal VGHC to the power supply terminal of the control circuit 02 to supply power to the control circuit 02. That is, the dc-dc converter 011 may convert the input power supply signal to generate the power supply signal VGHC to supply power to the control circuit 02.

Each charge pump 012 may be coupled to the input power supply terminal VIN and the switching circuit 03, respectively. Each charge pump 012 may be configured to transmit one of the alternative power supply signals to the switching circuit 03 based on the input power supply signal, and the potential of the alternative power supply signal transmitted by each charge pump 012 is different among the at least two charge pumps 012. Thereby, at least two kinds of alternative power supply signals VGH1 … VGHN of different potentials can be transmitted to the switching circuit 03.

For example, each charge pump 012 may have one input and one output. An input terminal of each charge pump 012 may be coupled to the input power supply terminal VIN, an output terminal of each charge pump 012 may be coupled to one input terminal of the switch circuit 03, and an output terminal of each charge pump 012 may be coupled to a different input terminal of the switch circuit 03, i.e., the output terminals of a plurality of charge pumps 012 may be coupled to a plurality of input terminals of the switch circuit 03 in a one-to-one correspondence. Each charge pump 012 may be used to boost the input power signal to an alternative power signal and then transmit the alternative power signal to one input terminal of the switching circuit 03. That is, the input power signal may be converted by the charge pump 012 to generate an alternative power signal.

Of course, in some other embodiments, the direct current DCDC converter 011 and the charge pump 012 may be replaced with each other. That is, the input power supply signal may be converted by the dc-dc converter to generate an alternative power supply signal, and the input power supply signal may be converted by the charge pump 012 to generate a power supply signal VGHC to supply power to the control circuit 02. Alternatively, the dc-dc converter 011 and the charge pump 012 may be replaced by other power supply circuits. The embodiments of the present disclosure are not limited in this regard.

Optionally, as can be seen with continued reference to fig. 4, the control circuit 02 described in the embodiments of the present disclosure may include: a control sub-circuit 021 and a voltage conversion sub-circuit 022.

On this basis, the power supply circuit 01 may be coupled with the voltage conversion sub-circuit 022. The power supply circuit 01 may be configured to transmit the power supply signal VGHC to the voltage conversion sub-circuit 022 based on the input power supply signal.

For example, as described in connection with the above embodiments, the voltage conversion sub-circuit 022 in the control circuit 02 may have a power source terminal. An input terminal of the power circuit 01 (i.e., the direct current DCDC converter 011) may be coupled to the input power terminal VIN, and one output terminal of the power circuit 01 may be coupled to a power terminal of the voltage conversion sub-circuit 022 and transmit the power supply signal VGHC to the voltage conversion sub-circuit 022 based on the input power supply signal.

The control sub-circuit 021 may be coupled to the voltage conversion circuit 04 and the voltage conversion sub-circuit 022, respectively. The control sub-circuit 021 may be used to receive a picture to be displayed and, based on the picture to be displayed, transmit an alternative driving signal GOAI to the voltage conversion circuit 04 and at least two alternative switching control signals VC1 … VCN of different potentials to the voltage conversion sub-circuit 022.

For example, as described in connection with the above embodiments, the control sub-circuit 021 may have an input terminal and a plurality of output terminals. The voltage conversion sub-circuit 022 may also have a plurality of input terminals. The input terminal of the control sub-circuit 021 may be coupled to the communication interface eDP, one of the output terminals of the control sub-circuit 021 may be coupled to the voltage conversion circuit 04, and the other output terminals may be coupled to the input terminals of the voltage conversion sub-circuit 022 in a one-to-one correspondence. The control sub-circuit 021 may generate an alternative driving signal GOAI based on the to-be-displayed screen from the communication interface eDP, and transmit the alternative driving signal GOAI to the voltage converting circuit 04 via an output terminal coupled to the voltage converting circuit 04. And, the control sub-circuit 021 may generate at least two alternative switch control signals VC1 … VCN based on the frame to be displayed, and transmit the at least two alternative switch control signals VC1 … VCN to the voltage conversion sub-circuit 022 through a plurality of output terminals coupled to a plurality of input terminals of the voltage conversion sub-circuit 022 in a one-to-one correspondence. In other words, the voltage conversion sub-circuit 022 may receive the at least two alternative switch control signals VC1 … VCN.

The voltage conversion sub-circuit 022 may also be coupled with the switching circuit 03. The voltage conversion sub-circuit 022 may be configured to convert at least two alternative switch control signals VC1 … VCN into at least two target switch control signals VCH1 … VCHN in a one-to-one correspondence manner, and then transmit the converted signals to the switch circuit 03.

For example, as in the above embodiments, the voltage conversion sub-circuit 022 may also have a plurality of output terminals. The plurality of output terminals of the voltage conversion sub-circuit 022 may be coupled to the plurality of control terminals of the switch circuit 03 in a one-to-one correspondence. The voltage conversion sub-circuit 022 may boost the at least two alternative switch control signals VC1 … VCN into at least two target switch control signals VCH1 … VCHN, and transmit the at least two target switch control signals VCH1 … VCHN to the switch circuit 03 through a plurality of output terminals coupled to a plurality of control terminals of the switch circuit 03 in a one-to-one correspondence manner, so as to control the working state of the switch circuit 03. That is, each target switch control signal has the same potential type (e.g., both are the first potential or both are the second potential) as the corresponding one of the alternative switch control signals, but the potentials are different in magnitude, i.e., the magnitudes of the potentials are different. And the potential of the general target switch control signal is greater than the potential of the corresponding alternative switch control signal, thereby enhancing the ability to drive the switch circuit 03.

Optionally, the voltage conversion sub-circuit 022 included in the control circuit 02 may be integrated with the voltage conversion circuit 04, that is, multiplexed into the same voltage conversion circuit, so as to simplify the structure and save the cost.

Optionally, as can be seen with continued reference to fig. 4, the switching circuit 03 according to the embodiment of the present disclosure may include: at least two switching transistors K1.

The gates of the at least two switching transistors K1 may be coupled as control terminals to the control circuit 02, the first poles of the at least two switching transistors K1 may be coupled as input terminals to the power supply circuit 01, and the second poles of the at least two switching transistors K1 may be coupled as output terminals to the voltage converting circuit 04.

For example, as described in connection with the above embodiments, the gates of the at least two switching transistors K1 may be coupled to the plurality of output terminals of the voltage conversion sub-circuit 022 in a one-to-one correspondence manner, so as to respectively receive the at least two target switching control signals VCH1 … VCHN. The first poles of the at least two switching transistors K1 may be coupled to the output terminals of the at least two charge pumps 012 in a one-to-one correspondence to receive at least two alternative power supply signals VGH1 … VGHN, respectively. In the at least two target switch control signals VCH1 … VCHN, when the potential of one target switch control signal (e.g., VCH 1) is a first potential and the potential of the other target switch control signals (e.g., VCH2 … VCHN) is a second potential, one target switch transistor K1 of the at least two switch transistors K1 for receiving the target switch control signal VCH1 may be turned on, and each of the other switch transistors K1 except the target switch transistor K1 may be turned off. Accordingly, the first pole and the second pole of the target switching transistor K1 are turned on. Of the at least two charge pumps 012, a target charge pump 012 coupled to a first pole of the target switching transistor K1 is in conduction with the voltage conversion circuit 04, and an alternative power supply signal (e.g., VGH 1) generated by the target charge pump 012 may be transmitted to the voltage conversion circuit 04 via the turned-on target switching transistor K1.

Alternatively, in the embodiment of the present disclosure, the switching transistor K1 may be an N-type transistor shown in fig. 4. At this time, the first potential (i.e., the effective potential) may be a high potential with respect to the second potential (i.e., the ineffective potential). Of course, in some other embodiments, the switching transistor K1 may be a P-type transistor or a combination of an N-type transistor and a P-type transistor. For a P-type transistor, the first potential may be low relative to the second potential. In addition, the transistor described in the embodiments of the present disclosure may be: metal-oxide-semiconductor (MOS) transistors, such as NMOS transistors, are all used.

Alternatively, one of the first and second poles of the switching transistor K1 may be a source(s) and the other pole may be a drain (d). As shown in fig. 4, in the switching transistor K1, a gate (gate) is denoted by g, a first electrode is denoted by drain d, and a second electrode is denoted by source s.

Optionally, as can be seen with continued reference to fig. 4, the display driving circuit according to the embodiment of the disclosure may further include: an isolation diode D1 connected in series between the second pole of each switching transistor K1 and the voltage conversion circuit 04. The isolation diode D1 may be used to isolate the second pole of the switching transistor K1 from the voltage conversion circuit 04, so as to avoid that a plurality of switching transistors K1 are turned on at the same time, and transmit a plurality of alternative power signals with different potentials to the voltage conversion circuit 04, thereby ensuring transmission reliability of the alternative power signals.

Of course, in some other embodiments, the isolation diode D1 may be replaced by an isolation device having the same functions as those described in the above embodiments.

Alternatively, in the embodiment of the present disclosure, the power supply circuit 01 may be configured to transmit the first alternative power supply signal VGH1 and the second alternative power supply signal VGH2 with different potentials to the switching circuit 03, that is, the power supply circuit 01 generates two alternative power supply signals with different potentials in total.

On this basis, referring to another display driving circuit shown in fig. 5, the control sub-circuit 021 according to the embodiment of the present disclosure may include: a timing controller 0211 and an Inverter (INV) 0212.

The timing controller 0211 may be coupled to the voltage converting circuit 04, the inverter 0212 and the voltage converting subcircuit 022, respectively. The timing controller 0211 may be used to receive a picture to be displayed, and may transmit an alternative driving signal GOAI to the voltage conversion circuit 04 and a first alternative switching control signal VC1 to the inverter 0212 and the voltage conversion sub-circuit 022 based on the picture to be displayed.

Inverter 0212 may also be coupled to voltage conversion subcircuit 022. The inverter 0212 may be used to invert the first alternative switch control signal VC1 to obtain a second alternative switch control signal VC2, and transmit the second alternative switch control signal VC2 to the voltage conversion subcircuit 022.

For example, as described in connection with the above embodiments, the timing controller 0211 may have one input terminal and two output terminals (the embodiments described below are referred to as a first output terminal and a second output terminal). Inverter 0212 may have one input and one output. The voltage conversion sub-circuit 022 may have two input terminals (hereinafter, the embodiment is referred to as a first input terminal and a second input terminal). An input terminal of the timing controller 0211 may be coupled to the communication interface eDP, a first output terminal of the timing controller 0211 may be coupled to the voltage conversion circuit 04, and a second output terminal of the timing controller 0211 may be coupled to an input terminal of the inverter 0212 and a first input terminal of the voltage conversion subcircuit 022, respectively. An output of the inverter 0212 may be coupled to a second input of the voltage conversion subcircuit 022. The timing controller 0211 may generate an alternative driving signal GOAI based on a picture to be displayed from the communication interface, and transmit the alternative driving signal GOAI to the voltage conversion circuit 04 via a first output terminal thereof. And, the timing controller 0211 may generate a first alternative switch control signal VC1 based on a picture to be displayed from the communication interface, and transmit the first alternative switch control signal VC1 to the input terminal of the inverter 0212 and the first input terminal of the voltage conversion sub-circuit 022 via the second output terminal thereof. The inverter 0212 can invert the first alternative switch control signal VC1 to a second alternative switch control signal VC2, and then the menstrual output is transmitted to the second input of the voltage conversion subcircuit 022.

Wherein the potential of the first alternative switch control signal VC1 is exactly opposite to the potential of the second alternative switch control signal VC 2. For example, one may be at a first potential and the other may be at a second potential.

The voltage conversion sub-circuit 022 may be configured to convert the first alternative switch control signal VC1 into the first target switch control signal VCH1 and transmit the first target switch control signal VCH1 to the switch circuit 03, and convert the second alternative switch control signal VC2 into the second target switch control signal VCH2 and transmit the second target switch control signal VCH2 to the switch circuit 03.

For example, as described in connection with the above-described embodiments, the voltage conversion sub-circuit 022 may also have two output terminals (hereinafter, referred to as a first output terminal and a second output terminal in the embodiments), and the switch circuit 03 may have two control terminals (hereinafter, referred to as a first control terminal and a second control terminal in the embodiments). A first output of the voltage conversion sub-circuit 022 may be coupled to a first control terminal of the switching circuit 03, and a second output of the voltage conversion sub-circuit 022 may be coupled to a second control terminal of the switching circuit 03. The voltage conversion sub-circuit 022 is configured to boost-convert the first switch control signal VC1 received by the first input terminal thereof into a first target switch control signal VCH1, and transmit the first target switch control signal VCH1 to the first control terminal of the switch circuit 03 via the first output terminal thereof. And, the voltage conversion sub-circuit 022 is configured to boost-convert the second alternative switch control signal VC2 received by the second input terminal thereof into the second target switch control signal VCH2, and transmit the second target switch control signal VCH2 to the second control terminal of the switch circuit 03 via the second output terminal thereof. As described in the above embodiment, the first target switch control signal VCH1 is different from the first alternative switch control signal VC1 only in potential amplitude, but is the same in potential type, for example, the first potential or the second potential. The second target switch control signal VCH2 and the second alternative switch control signal VC2 are the same.

The switching circuit 03 may be configured to transmit the first alternative power supply signal VGH1 or the second alternative power supply signal VGH2 to the voltage conversion circuit 04 in response to the first target switching control signal VCH1 and the second target switching control signal VCH 2.

For example, as described in connection with the above embodiments, referring to fig. 5, the power supply circuit 01 may include: two charge pumps 012, which can generate the first alternative power supply signal VGH1 or the second alternative power supply signal VGH2, respectively. The switching circuit 03 may have two input terminals (hereinafter, referred to as a first input terminal and a second input terminal) and two output terminals (hereinafter, referred to as a first output terminal and a second output terminal). In the figure, two charge pumps 012 are distinguished, one of which 012 is identified as 012-1, and the other 012 is identified as 012-2. A first input of the switching circuit 03 may be coupled to an output of one of the charge pumps 012-1 to receive a first alternative power supply signal VGH1 transmitted by the charge pump 012-1. A second input of the switching circuit 03 may be coupled to an output of another charge pump 012-2 to receive a second alternative power supply signal VGH2 transmitted by the charge pump 012-2. Both outputs of the switching circuit 03 may be coupled to the voltage converting circuit 04.

On the basis of the above coupling, the switching circuit 03 may be configured to transmit one of the first alternative power supply signal VGH1 and the second alternative power supply signal VGH2 (e.g., VGH 1) to the voltage conversion circuit 04 when the potential of the first target switch control signal VCH1 received by the first control terminal thereof is the first potential and the potential of the second target switch control signal VCH2 received by the second control terminal thereof is the second potential. And, the switching circuit 03 may transmit the other one of the first and second alternative power supply signals VGH1 and VGH2 (e.g., VGH 2) to the voltage conversion circuit 04 when the potential of the first target switch control signal VCH1 is the second potential and the potential of the second target switch control signal VCH2 is the first potential.

Alternatively, as described in connection with the above embodiments, and as can be seen with reference to fig. 5, the switching circuit 03 may comprise: two switching transistors K1. For distinction in fig. 5, one of the two switching transistors K1 is denoted as K11, and the other switching transistor K1 is denoted as K12.

The gate of one switching transistor K11 may be coupled to the first output terminal of the voltage conversion sub-circuit 022 as the first control terminal of the switching circuit 03, and the first pole of one switching transistor K11 may be coupled to the output terminal of one charge pump 012-1 as the first input terminal of the switching circuit 03. The gate of the further switching transistor K12 may be coupled as a second control terminal of the switching circuit 03 to the second output terminal of the voltage converting sub-circuit 022, and the first pole of the further switching transistor K12 may be coupled as a second input terminal of the switching circuit 03 to the output terminal of the further charge pump 012-2. And the second poles of the one switching transistor K11 and the other switching transistor K12 may be coupled to the voltage converting circuit 04 as two output terminals of the switching circuit 03. That is, both charge pumps 012 are coupled to the input power source terminal VIN and also coupled to the first poles of the two switching transistors K1 in a one-to-one correspondence. The gates of the two switching transistors K1 are coupled to the voltage converting sub-circuit 022, and the second poles of the two switching transistors K1 are coupled to the voltage converting circuit 04.

On the basis of the coupling described above, in connection with fig. 5, the charge pump 012-1 may generate a first alternative power supply signal VCH1 and the charge pump 012-2 may generate a second alternative power supply signal VCH2. When the potential of the first target switch control signal VCH1 is the first potential and the potential of the second target switch control signal VCH2 is the second potential, one switching transistor K11 may be turned on and the other switching transistor K12 may be turned off. The charge pump 012-1 is turned on to the voltage conversion circuit 04, and the first alternative power supply signal VGH1 generated by the charge pump 012-1 may be transmitted to the voltage conversion circuit 04 via the on switching transistor K11. When the potential of the first target switch control signal VCH1 is the second potential and the potential of the second target switch control signal VCH2 is the first potential, one switching transistor K11 may be turned off and the other switching transistor K12 may be turned on. The charge pump 012-2 is turned on with the voltage conversion circuit 04, and the second alternative power supply signal VGH2 generated by the charge pump 012-2 may be transmitted to the voltage conversion circuit 04 via the on switching transistor K12. This achieves the following: the switching circuit 03 transmits only one alternative power supply signal to the voltage converting circuit 04 for one period.

Further, as can be seen with reference to fig. 5, the display driving circuit may include: two isolation diodes D1, one of which is denoted D11 and the other isolation diode D1 is denoted D12, are shown as a distinction. Wherein, an isolation diode D11 may be connected in series between the second pole of a switching transistor K11 and the voltage converting circuit 04. Another isolation diode D12 may be connected in series between the second pole of the other switching transistor K12 and the voltage conversion circuit 04.

Alternatively, the potential of the first alternative power supply signal VGH1 may be greater than the potential of the second alternative power supply signal VGH 2. And on this basis, the timing controller 0211 may be used to determine a refresh rate based on the picture to be displayed. That is, the timing controller 0211 may add a frequency identification function. The timing controller 0211 may also be used to:

when the refresh rate is greater than the refresh rate threshold, a first alternative switch control signal VC1 of the first potential is transmitted to the voltage conversion sub-circuit 022. The inverter 0212 is used for inverting the first alternative switch control signal VC1 of the first potential to obtain a second alternative switch control signal VC2 of the second potential. And transmits a second alternative switch control signal VC2 of the second potential to the voltage conversion sub-circuit 022. The voltage conversion sub-circuit 022 is configured to convert the first alternative switch control signal VC1 of the first potential into a first target switch control signal VCH1 of the first potential and transmit the first target switch control signal VCH1 to the switch circuit 03, and convert the second alternative switch control signal VC2 of the second potential into a second target switch control signal VCH2 of the second potential and transmit the second target switch control signal VCH2 to the switch circuit 03. The switching circuit 03 transmits the first alternative power supply signal VGH1 to the voltage conversion circuit 04 in response to the first target switching control signal VCH1 of the first potential and the second target switching control signal VCH2 of the second potential.

When the refresh rate is smaller than the refresh rate threshold, the first alternative switch control signal VC1 of the second potential is transmitted to the voltage conversion sub-circuit 022. The inverter 0212 is used for inverting the first alternative switch control signal VC1 of the second potential to obtain the second alternative switch control signal VC2 of the first potential, and transmitting the second alternative switch control signal VC2 of the first potential to the voltage conversion sub-circuit 022. The voltage conversion sub-circuit 022 is configured to convert the first alternative switch control signal VC1 of the second potential into a first target switch control signal VCH1 of the second potential and then transmit the first target switch control signal VCH1 to the switch circuit 03, and convert the second alternative switch control signal VC2 of the first potential into a second target switch control signal VCH2 of the first potential and then transmit the second target switch control signal VCH2 of the first potential to the switch circuit 03. The switching circuit 03 transmits the second alternative power supply signal VGH2 to the voltage conversion circuit 04 in response to the first target switching control signal VCH1 of the second potential and the second target switching control signal VCH2 of the first potential.

That is, in the embodiments of the present disclosure, the refresh rate threshold may be pre-stored in the timing controller 0211, and a refresh rate greater than the refresh rate threshold may be considered to be at a high refresh rate, whereas a refresh rate less than the refresh rate threshold may be considered to be at a low refresh rate. And, upon detecting that the display product is at a low refresh rate, the timing controller 0211 controls the switching circuit 03 to transmit the second alternative power supply signal VGH2 of a smaller potential as the target alternative power supply signal VGHn to the voltage conversion circuit 04. And, upon detecting that the display product is at a high refresh rate, the timing controller 0211 controls the switch circuit 03 to transmit the first alternative power supply signal VGH1 of a larger potential as the target alternative power supply signal VGHn to the voltage conversion circuit 04.

That is, referring to the schematic diagram of the display driving circuit shown in fig. 6 and the schematic diagram of the solution to the problem shown in fig. 7, it is possible to (1) add a frequency recognition function to the timing controller TCON so that the timing controller TCON can perform recognition of the refresh rate and output a switching control signal in a level signal VC (i.e., TTL level) according to the determined refresh rate. The output terminal of the timing controller TCON may be a general-purpose input/output (GPIO) interface. (2) A2-way VGH switching circuit is added between the DC-DC converter and the voltage conversion circuit L/S. Specifically, two charge pumps 012-1 and 012-2 as shown in fig. 6 are added to generate VGH1 and VGH2, and two switching transistors K11 and K12 are added to realize synchronous switching of VGH1 and VGH2 and refresh rate under the driving of a switching control signal. At low refresh rates, VGH is reduced, i.e., a signal at a lower potential of VGH1 and VGH2 is used as the target alternative power supply signal. At high refresh rates, the higher potential signal of VGH1 and VGH2 is used as the target alternative power supply signal, and if the original VGH is VGH2, it can be considered to keep the original VGH unchanged.

Through testing, under the high refresh rate, VGH with high potential is adopted, so that no horizontal black line in the display panel can be ensured, and the GOA circuit can be reliably charged. Under the condition of low refresh rate, by reducing VGH, the leakage difference between transistors in GOA circuit can be reduced, thereby achieving the purpose of improving the horizontal black line of the display panel. Fig. 8 shows effect diagrams before and after improvement, and as can be seen from fig. 8, by flexibly switching the alternative power supply signals according to the refresh rate to drive the GOA circuit to generate the gate driving signal, it is ensured that a plurality of rows of pixels in the display panel normally emit light under the driving of the gate driving signal, and the horizontal black line of the display panel disappears. The left Bian Futu in fig. 8 is a schematic diagram of a display panel with a low refresh rate in the related art. The right drawing in fig. 8 is a schematic diagram of a display panel at a low refresh rate in a display driving circuit employing an embodiment of the present disclosure.

It was found in the test that the above-mentioned horizontal black line problem could be slightly improved by decreasing the original VGH (e.g., VGH1 described in the above-mentioned embodiment by 2V-6V) at a low refresh rate. In other words, the second power supply signal VGH2 of the smaller potential described in the above embodiment may be different from the first power supply signal VGH1 of the larger potential by about 2V to 6V. The operation of the two charge pumps 012-1 and 012-2 may be set based on the potential difference.

It should be noted that, the dual VGH synchronous switching circuit according to the above embodiment can implement the level switching function of any voltage under the condition of determining the timing logic of the timing controller TCON, and its function is not limited to the countermeasure against the horizontal line problem. For example, the display gray level can be determined according to the picture to be displayed, and VGH can be flexibly switched according to the determined display gray level, so that the display effect of the display panel is better. Of course, the switching of the pull-down power supply signal such as VGL is not limited to the switching of VGH.

Alternatively, referring to fig. 9, it can be seen that the VGH switching and the switching of the on signal provided by the on signal terminal STV may be synchronized, i.e. simultaneously. Here, the on signal provided by the on signal terminal STV may refer to a signal output to the GOA circuit to drive the GOA circuit to start progressive scanning. The on signal is typically toggled once per frame, so VGH may also set the select toggle once per frame. Further, as can be seen from fig. 9, the lower potential VGH (i.e., the second alternative power supply signal VGH 2) may be 29V, the higher potential VGH (i.e., the first alternative power supply signal VGH 1) may be 34V, and the switching of the on signal provided by the on signal terminal STV is synchronized by 29V to 34V, which is different by 5V. Also shown in fig. 9 is the gate drive signal Gout output from the GOA circuit, which has the same potential amplitude as the target alternative power supply signal.

Alternatively, in the embodiment of the present disclosure, the power supply circuit 01 may also be used to transmit at least two common power supply signals Vcom of different electric potentials to a plurality of rows of pixels, i.e., multiple Vcom switches may be set.

Wherein the at least two common power supply signals and the at least two alternative power supply signals may be in one-to-one correspondence. As can be seen in connection with one of the timing diagrams shown in fig. 10, the one-to-one correspondence of at least two common power signals to at least two alternative power signals may refer to: with the alternative power supply signal of lower potential, the setting power supply circuit outputs the common power supply signal Vcom of lower potential, and the two are matched with each other. Under the alternative power supply signal with higher potential, the power supply circuit is set to output the common power supply signal Vcom with higher potential, and the two signals are matched with each other. In fig. 10, the abscissa indicates VGH, the ordinate indicates Vcom, and the units are V.

For example, taking two alternative power supply signals including the first alternative power supply signal VGH1 and the second alternative power supply signal VGH2 as an example, the power supply circuit 01 may correspondingly generate the common power supply signal Vcom of two different potentials. Referring to fig. 10, if the potential of the first alternative power signal VGH1 is 34V, the potential of the common power signal Vcom corresponding thereto may be about 5.64V. If the potential of the second alternative power supply signal VGH2 is 29V, the potential of the common power supply signal Vcom corresponding thereto may be synchronously switched to about 5.74V.

Through testing, if only VGH is switched, that is, the alternative power signal output to the voltage conversion circuit 04 is changed, and the unique common power signal Vcom is adopted, the optimum flicker (i.e., the minimum flicker degree) of the display product will be affected, and further display abnormal performance such as residual image of the display product will be caused. On the other hand, on the premise of switching VGH, the power supply circuit 01 is provided to output the preferred common power signal Vcom corresponding to VGH to the pixels, so that flicker can be improved, the problem of residual image existing as described above can be solved, and a good display effect can be ensured. Also, it should be noted that the voltage difference Vgs of the gate-source voltage difference Vgs of the switching circuit 03 needs to be higher as the voltage of the VGH to be switched (i.e., the larger the difference in the potentials of the two VGHs to be switched) is, so as to ensure reliable switching.

As can be seen from the description of the above embodiments, the embodiments of the present disclosure provide a novel display driving circuit capable of synchronously switching VGH voltages according to a refresh rate. The circuit fully utilizes some logic and functions of the original device (such as the time sequence controller TCON), and can recognize the refresh rate of an input video signal (namely, a picture to be displayed) and synchronously switch the on voltage/off voltage by utilizing the time sequence controller TCON on the premise of not changing the line width of the signal, thereby improving the display quality problems of horizontal lines and the like of the display panel.

Alternatively, as can be seen with reference to fig. 6, the various circuits included in the display driver circuit may be integrally provided on a printed circuit board assembly (printed circuit board assembly, PCBA).

Fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present disclosure. As shown in fig. 11, the display device may include: a plurality of rows of pixels P1, a gate driving circuit (i.e., GOA circuit) 10, and a display driving circuit 00 as described in the above embodiment.

Wherein the display driving circuit 00 is coupled with the gate driving circuit 10. The display driving circuit 00 is used for transmitting a driving signal GOAO to the gate driving circuit 10.

The gate driving circuit 10 may also be coupled to the plurality of rows of pixels P1. The gate driving circuit 10 may be used to transmit gate driving signals to the plurality of rows of pixels P1 based on the driving signals to drive the plurality of rows of pixels P1 to emit light.

Alternatively, the display device may include a display panel, and the plurality of rows of pixels P1 and the gate driving circuit 10 may be integrated on the display panel and include a plurality of columns of pixels P1. The display driving circuit 00 may be disposed at the periphery of the display panel (generally disposed in the bonding area) and coupled with the gate driving circuit 10 in a bonding manner.

Alternatively, the display device may be: OLED display devices, active-matrix organic light-emitting diode (AMOLED) display devices, LCD display devices, cell phones, tablet computers, televisions, and displays, and the like.

The terminology used in the description of the embodiments of the disclosure is for the purpose of describing the embodiments of the disclosure only and is not intended to be limiting of the disclosure. Unless defined otherwise, technical or scientific terms used in the embodiments of the present disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present disclosure belongs.

As used in the specification and claims of this application, the terms "first," "second," or "third," and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items.

"upper", "lower", "left" or "right" etc. are only used to indicate relative positional relationships, which may also be changed accordingly when the absolute position of the object to be described is changed. "connected" or "coupled" refers to electrical connections.

"and/or" means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working processes of the gate driving circuit, the shift register unit, each circuit and the sub-circuit described above may refer to corresponding processes in the method embodiments, and are not repeated herein.

The foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.

Claims

1. A display driving circuit, characterized in that the display driving circuit comprises: a power supply circuit, a control circuit, a switching circuit and a voltage conversion circuit;

The control circuit is further coupled with the switching circuit and the voltage conversion circuit respectively, and is used for acquiring a picture to be displayed, determining a refresh rate based on the picture to be displayed, transmitting an alternative driving signal to the voltage conversion circuit based on the picture to be displayed, and transmitting at least two target switching control signals with different potentials to the switching circuit based on the refresh rate;

the voltage conversion circuit is used for being coupled with the grid driving circuit, the voltage conversion circuit is used for converting the alternative driving signal into a target driving signal based on the target alternative power supply signal and then transmitting the target driving signal to the grid driving circuit so that the grid driving circuit drives the coupled multiple rows of pixels to emit light based on the target driving signal, and the potential amplitude of the target driving signal is different from that of the alternative driving signal;

The power supply circuit is used for transmitting a first alternative power supply signal and a second alternative power supply signal to the switch circuit, wherein the potential of the first alternative power supply signal is larger than that of the second alternative power supply signal; the control circuit is used for transmitting two target switch control signals with different potentials to the switch circuit based on the refresh rate; the switching circuit is configured to transmit the first alternative power supply signal as a target alternative power supply signal to the voltage conversion circuit in response to two target switching control signals transmitted by the control circuit when the refresh rate is greater than a refresh rate threshold, and transmit the second alternative power supply signal as a target alternative power supply signal to the voltage conversion circuit in response to two target switching control signals transmitted by the control circuit when the refresh rate is less than a refresh rate threshold.

2. The display driver circuit according to claim 1, wherein the power supply circuit includes: a Direct Current (DC) DC converter and two charge pumps;

Each of the charge pumps is coupled to the input power supply terminal and the switching circuit, respectively, and each of the charge pumps is configured to transmit an alternative power supply signal to the switching circuit based on the input power supply signal.

3. The display driver circuit according to claim 1, wherein the switching circuit includes: two switching transistors;

the gates of the two switching transistors are coupled with the control circuit, the first poles of the two switching transistors are coupled with the power supply circuit, and the second poles of the two switching transistors are coupled with the voltage conversion circuit.

4. A display driver circuit according to claim 3, wherein the display driver circuit further comprises: and the isolation diode is connected in series between the second pole of each switching transistor and the voltage conversion circuit, and is used for isolating the second pole of the switching transistor from the voltage conversion circuit.

5. The display drive circuit according to any one of claims 1 to 4, wherein the control circuit includes: a control sub-circuit and a voltage conversion sub-circuit;

The control sub-circuit is respectively coupled with the voltage conversion circuit and the voltage conversion sub-circuit, and is used for receiving the picture to be displayed, determining a refresh rate based on the picture to be displayed, transmitting the alternative driving signal to the voltage conversion circuit based on the picture to be displayed, and transmitting two alternative switch control signals with different potentials to the voltage conversion sub-circuit based on the refresh rate;

the voltage conversion sub-circuit is further coupled with the switch circuit, and is used for converting the two alternative switch control signals into the two target switch control signals in a one-to-one correspondence mode and transmitting the two target switch control signals to the switch circuit.

6. The display driver circuit of claim 5, wherein the control sub-circuit comprises: a timing controller and an inverter;

the time schedule controller is respectively coupled with the voltage conversion circuit, the inverter and the voltage conversion sub-circuit, and is used for receiving a picture to be displayed, determining a refresh rate based on the picture to be displayed, transmitting the alternative driving signal to the voltage conversion circuit based on the picture to be displayed, and transmitting a first alternative switch control signal to the inverter and the voltage conversion sub-circuit based on the refresh rate;

the voltage conversion sub-circuit is used for converting the first alternative switch control signal into a first target switch control signal and then transmitting the first target switch control signal to the switch circuit, and converting the second alternative switch control signal into a second target switch control signal and then transmitting the second target switch control signal to the switch circuit.

7. The display driver circuit of claim 6, wherein the timing controller is further configured to:

8. The display drive circuit according to claim 6 or 7, wherein the power supply circuit includes: two charge pumps; the switching circuit includes: two switching transistors;

9. The display drive circuit according to any one of claims 1 to 4, wherein the power supply circuit is further configured to transmit two common power supply signals of different potentials to the plurality of rows of pixels;

wherein the two common power signals are in one-to-one correspondence with the two alternative power signals.

10. A display device, characterized in that the display device comprises: a plurality of rows of pixels, a gate driving circuit, and a display driving circuit as claimed in any one of claims 1 to 9;