CN114974150B - Discharge circuit, discharge method and display device - Google Patents
Discharge circuit, discharge method and display device Download PDFInfo
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- CN114974150B CN114974150B CN202110209388.6A CN202110209388A CN114974150B CN 114974150 B CN114974150 B CN 114974150B CN 202110209388 A CN202110209388 A CN 202110209388A CN 114974150 B CN114974150 B CN 114974150B
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- 238000000034 method Methods 0.000 title claims abstract description 59
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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
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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Abstract
A discharge circuit, a discharge method and a display device are provided. The discharge circuit includes: the display device comprises a control sub-circuit, a first discharging sub-circuit and a second discharging sub-circuit, wherein when the control sub-circuit detects that the display device is in a first state in the shutdown process, a first control signal is output to the first discharging sub-circuit, and the first discharging sub-circuit provides a signal of a first power supply end to a first node so as to enable pixels of the display panel to discharge; when the display device is detected to be in a second state in the shutdown process, outputting a second control signal to a second discharging sub-circuit; the second discharging sub-circuit provides a signal of the ground terminal to the first node. According to the scheme provided by the embodiment, in the shutdown process, a signal of the grounding end is provided for the first node, so that the output voltage of the grid driving circuit is stabilized at or close to the grounding voltage, the interference of the direct current coupling electric field on the optimal Vcom setting is reduced, and the problem of afterimage of a display system is improved.
Description
Technical Field
Embodiments of the present application relate to, but are not limited to, display technologies, and in particular, to a discharge circuit, a discharge method, and a display device.
Background
In terms of displaying the afterimage representation of the product, the narrow afterimage refers to the picture residue caused by the Aging black and white block (Mosaic) picture. The main cause of this residue is imbalance in the black and white picture driving, and the difference is generated by long-term accumulation. This difference will leave a black and white frame to the next frame, causing a visual afterimage problem. The residual image in the broad sense includes the problem of picture residual caused by random pictures, such as station marks for watching a certain television station for a long time, news program owners, etc.
As is clear from the estimation of the mechanism of the afterimage, when the gate voltage is fixed, the current level changes with the change of the source voltage, as is known from the output characteristics of the thin film transistor (Thin Film Transistor, TFT). Therefore, the leakage of the pixel at the positive and negative frame voltages is different. And the difference of the pixel voltage of the positive frame and the negative frame is different, direct current offset (DC) can be generated, so that ions are gathered into an internal electric field to form an afterimage.
Fluctuation of the common Voltage (VCOM) itself, or unstable factors such as an electric field in liquid crystal, a coupling electric field, etc., for example, changes in power up and power down or illumination conditions, etc., all cause changes in the integrated electric field. If the product common Voltage (VCOM) is set under varying electric field conditions, a DC offset (DC) is generated. The larger the set common Voltage (VCOM) bias, the higher the Flicker (Flicker) value of the product after reaching the relatively stable electric field, and the more serious the afterimage.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the application provides a discharge circuit, a discharge method and a display device, and residual images are improved.
In one aspect, an embodiment of the present application provides a discharge circuit applied to a display device including a display substrate and a gate driving circuit, the discharge circuit including: the control sub-circuit, first discharging sub-circuit and second discharging sub-circuit, first discharging sub-circuit is connected respectively control sub-circuit, first power end and first node, the second discharging sub-circuit is connected respectively control sub-circuit first node and ground connection, first node is connected to grid drive circuit, wherein:
The control sub-circuit is configured to output a first control signal to the first discharge sub-circuit when detecting that the display device is in a first state in a shutdown process; when the display device is detected to be in a second state in the shutdown process, outputting a second control signal to the second discharging sub-circuit;
The first discharging sub-circuit is configured to provide a signal of the first power supply terminal to the first node when receiving the first control signal, so that the gate driving circuit controls the pixels of the display panel to discharge;
The second discharging sub-circuit is configured to provide the signal of the ground terminal to the first node upon receiving the second control signal.
In an exemplary embodiment, the detecting that the display device is in a first state during shutdown includes: detecting that a logic input voltage of the display device is powered down to a first voltage threshold;
the detecting that the display device is in the second state in the shutdown process comprises: a power down of a logic input voltage of the display device to a second voltage threshold is detected, the second voltage threshold being less than the first voltage threshold.
In an exemplary embodiment, the first discharging sub-circuit is further configured to turn off between the first power supply terminal and the first node when a logic input voltage of the display device is powered down to a second voltage threshold.
In an exemplary embodiment, the first discharging sub-circuit includes: and a control electrode of the first transistor is connected with the control sub-circuit, a first electrode of the first transistor is connected with the first power supply end, and a second electrode of the first transistor is connected with the first node.
In an exemplary embodiment, the second discharging sub-circuit includes: and the control electrode of the second transistor is connected with the control sub-circuit, the first electrode is connected with the first node, and the second electrode is connected with the grounding end.
In an exemplary embodiment, the discharging circuit further comprises a third discharging sub-circuit, the third discharging sub-circuit connecting the control sub-circuit, the second power supply terminal and the first node, wherein:
The control sub-circuit is further configured to output a third control signal to the third discharge sub-circuit when detecting that the display device is in a first state in a shutdown process; when the display device is detected to be started, outputting a fourth control signal to the third discharging sub-circuit;
The third discharging sub-circuit is configured to turn off the second power supply terminal and the first node when receiving the third control signal; and when the fourth control signal is received, the signal of the second power supply terminal is provided for the first node.
In an exemplary embodiment, the third discharging sub-circuit includes: and a third transistor, wherein a control electrode of the third transistor is connected with the control sub-circuit, a first electrode of the third transistor is connected with the first node, and a second electrode of the third transistor is connected with the second power supply end.
In yet another aspect, an embodiment of the present disclosure provides a display device including the above discharge circuit.
In still another aspect, an embodiment of the present disclosure provides a discharging method, which is applied to the above discharging circuit, including:
When the display device is detected to be in a first state in the shutdown process, outputting a first control signal to the first discharging sub-circuit; the first discharging sub-circuit provides a signal of the first power supply terminal to the first node, so that the gate driving circuit controls the display panel to discharge;
when the display device is detected to be in a second state in the shutdown process, outputting a second control signal to the second discharging sub-circuit; and when the second discharging electronic circuit receives the second control signal, the signal of the grounding end is provided to the first node.
In an exemplary embodiment, the detecting that the display device is in a first state during shutdown includes: detecting that a logic input voltage of the display device is powered down to a first voltage threshold;
the detecting that the display device is in the second state in the shutdown process comprises: a power down of a logic input voltage of the display device to a second voltage threshold is detected, the second voltage threshold being less than the first voltage threshold.
In an exemplary embodiment, applied to the above discharge circuit, the discharge method further includes,
When the display device is detected to be started, outputting a fourth control signal to the third discharging sub-circuit; when the third discharging sub-circuit receives the fourth control signal, the signal of the second power supply end is provided for the first node;
When the display device is detected to be in a first state in the shutdown process, outputting a third control signal to the third discharging sub-circuit; and when the third discharging sub-circuit receives the third control signal, the second power supply end and the first node are turned off.
The embodiment of the application comprises a discharge circuit, a discharge method and a display device, wherein the discharge circuit is applied to the display device comprising a display substrate and a grid driving circuit, and comprises the following components: the control sub-circuit, first discharging sub-circuit and second discharging sub-circuit, first discharging sub-circuit is connected respectively control sub-circuit, first power end and first node, the second discharging sub-circuit is connected respectively control sub-circuit first node and ground connection, first node is connected to grid drive circuit, wherein: the control sub-circuit is configured to output a first control signal to the first discharge sub-circuit when detecting that the display device is in a first state in a shutdown process; when the display device is detected to be in a second state in the shutdown process, outputting a second control signal to the second discharging sub-circuit; the first discharging sub-circuit is configured to provide a signal of the first power supply terminal to the first node when receiving the first control signal, so that the gate driving circuit controls the pixels of the display panel to discharge; the second discharging sub-circuit is configured to provide the signal of the ground terminal to the first node upon receiving the second control signal. According to the scheme provided by the embodiment, in the shutdown process, a signal of the grounding end is provided for the first node, so that the output voltage of the grid driving circuit is stabilized at or close to the grounding voltage, the weak direct current electric field of the display device is enabled to be smaller, the interference of the direct current coupling electric field on the optimal Vcom setting is reduced, and the problem of afterimage of the display system is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
FIG. 1 is a schematic diagram of electrical coupling waveforms under BM;
FIG. 2 is a schematic diagram of a discharge circuit provided in an exemplary embodiment;
FIG. 3 is a schematic diagram of a first discharge sub-circuit provided in an exemplary embodiment;
FIG. 4 is a schematic diagram of a second discharge sub-circuit provided by an exemplary embodiment;
FIG. 5 is a schematic diagram of a discharge circuit provided in an exemplary embodiment;
FIG. 6 is a schematic diagram of a third discharge sub-circuit provided by an exemplary embodiment;
FIG. 7 is a schematic diagram of a discharge circuit provided in an exemplary embodiment;
Fig. 8 is a flow chart of a discharge method according to an exemplary embodiment.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. Embodiments of the application and features of the embodiments may be combined with one another arbitrarily without conflict.
The steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, while a logical order is depicted in the flowchart, in some cases, the steps depicted or described may be performed in a different order than presented herein.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The ordinal numbers of "first", "second", "third", etc. in the present disclosure are provided to avoid intermixing of constituent elements, and do not denote any order, quantity, or importance.
In this disclosure, a transistor refers to an element including at least three terminals of a gate electrode, a drain electrode, and a source electrode. The transistor has a channel region between a drain electrode (a drain electrode terminal, a drain region, or a drain electrode) and a source electrode (a source electrode terminal, a source region, or a source electrode), and a current can flow through the drain electrode, the channel region, and the source electrode. In the present disclosure, a channel region refers to a region through which current mainly flows.
In the present disclosure, the first electrode may be a drain electrode, and the second electrode may be a source electrode, or the first electrode may be a source electrode, and the second electrode may be a drain electrode. In the case of using a transistor having opposite polarity, or in the case of a change in the direction of current during circuit operation, the functions of the "source electrode" and the "drain electrode" may be interchanged. Thus, in this disclosure, the "source electrode" and the "drain electrode" may be interchanged.
In this disclosure, "connected" includes a case where constituent elements are connected together by an element having some electric action. The "element having a certain electric action" is not particularly limited as long as it can transmit and receive an electric signal between the constituent elements connected. Examples of the "element having some electric action" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, other elements having various functions, and the like.
Currently, aiming at the problem of afterimage of a display system, the main process influencing factor is set to the optimal common voltage (Vcom) value. Under the optimal Vcom of a certain product in an ideal state, the Flicker can reach a lower degree, so that the problem of afterimage caused by a built-in electric field due to unbalanced alternating current driving is avoided.
The setting of the optimal Vcom value is mainly affected by the Flicker drift. Under the condition of rapid change of multiple switching on and switching off electric fields, a Flicker is required to be stabilized, and under the influence of DC and other conditions, the stabilization process can be accompanied with the establishment of an electric field, so that the optimal Vcom is directly influenced, and the problem of afterimage is caused.
Current research into electric fields is largely divided into two main categories: a strong alternating current electric field generated by alternating current driving and a weak direct current electric field generated by coupling. Wherein the strong alternating current electric field can be guided by setting the driving signal; weak direct current electric fields are limited in research, and have a large number of influencing factors, which are usually important influencing points of the afterimage problem.
From the two kinds of electric field effects, the two kinds of electric field effects are interacted in a period of power-on and power-off of the display system. The weak dc electric field has a relatively complex influence time and degree after power-up, which results in difficulty in setting an optimal Vcom. From the aspect of the comprehensive electric field influence of the display system, the stable state after the interactive influence is mainly influenced by a strong alternating current electric field; similarly, the interaction effect after power-down is mainly affected by a weak direct current electric field. Because the strength of the weak dc electric field is related to the material, the state of the down-coupling, and the down-time, this electric field is always in variation.
The weak dc electric field may be present in the Panel (Panel) layers, such as a Black Matrix (BM) or the like. The main source of the weak dc electric field is the coupling of the drive signal after power down, and the most dominant effect is the Gate (Gate) signal. Fig. 1 is a voltage waveform diagram after the BM layer is powered down under the signal coupling condition. As shown in fig. 1, BM power-down mainly goes through 3 processes:
Before power down: the signal coupling is mainly carried out by the Gate on (the output end signal Gout of the grid driving circuit or the clock signal GOA-CLK of the grid driving circuit), so that the signal coupling is relatively balanced;
Discharge (Discharge): the Discharge power Lu Ladi is a power source VGH, and the BM signal is pulled up by the falling VGH voltage;
After Discharge: the Discharge power Lu Ladi has two power supply terminals VGL, and the BM signal is pulled down by the restored VGL voltage.
Because the weak direct current electric field is coupled by VGH and VGL after the current product is powered down, the voltage is uncertain in both high and low voltage and positive and negative. The combination of the influence of the power-down time results in uncertainty of the interaction influence after power-up, and finally influences the optimal Vcom setting. For example, for detection of BM at power-down time of 2 hours in an actual display system, the absolute value of the charged voltage is greater than 3V, and the weak dc electric field has a great influence on the power-up optimal Vcom setting.
In the embodiment of the disclosure, the voltage of the output end of the gate driver is stabilized at the ground voltage by changing the working mode of the existing display system, so that the weak direct current electric field is relatively stable, the aim of improving the shutdown weak direct current electric field is fulfilled, the interference of the direct current coupling electric field on the optimal Vcom setting is greatly reduced, and the problem of afterimage of the display system is solved.
Fig. 2 is a schematic diagram of a discharge circuit according to an embodiment of the disclosure. As shown in fig. 2, the discharge circuit is applied to a display device including a display substrate and a gate driving circuit, and may include: the control sub-circuit, first discharging sub-circuit and second discharging sub-circuit, first discharging sub-circuit is connected respectively control sub-circuit, first power supply end VGH and first node A, the second discharging sub-circuit is connected respectively control sub-circuit first node A and ground connection GND, first node A is connected to grid drive circuit, wherein:
The control sub-circuit is configured to output a first control signal to the first discharge sub-circuit when detecting that the display device is in a first state in a shutdown process; when the display device is detected to be in a second state in the shutdown process, outputting a second control signal to the second discharging sub-circuit;
the first discharging sub-circuit is configured to provide a signal of the first power supply terminal VGH to the first node a when receiving the first control signal, so that the gate driving circuit controls the pixels of the display panel to discharge;
the second discharging sub-circuit is configured to supply the signal of the ground GND to the first node when receiving the second control signal.
According to the scheme provided by the embodiment, in the shutdown process, a signal of the grounding end is provided for the first node, so that the output voltage of the grid driving circuit is stabilized at or close to the grounding voltage, the weak direct current electric field of the display device is enabled to be smaller, the interference of the direct current coupling electric field on the optimal Vcom setting is reduced, and the problem of afterimage of the display system is improved.
In an exemplary embodiment, the detecting that the display device is in a first state during shutdown includes: detecting that a logic input voltage of the display device is powered down to a first voltage threshold; the detecting that the display device is in the second state in the shutdown process comprises: a power down of a logic input voltage of the display device to a second voltage threshold is detected, the second voltage threshold being less than the first voltage threshold. The magnitudes of the first voltage threshold and the second voltage threshold can be set according to the needs. The detection modes of the first state and the second state are merely examples, and other modes may be set as needed to perform detection. The second state is a state after the first state in the power-down process.
The logic input voltage of the display device is, for example, an input voltage VIN of a driving Integrated Circuit (IC) of the display device or a voltage obtained by dividing VIN. The first state of the display device in the shutdown process can be detected by using an XON function of the display device, that is, when the logic input voltage drops to a certain value, the XON function is turned on, that is, an XON signal is generated, and the XON signal can be used as a first control signal. The XON signal may be generated using a first voltage comparator. The second control signal may be generated using a second voltage comparator.
In an exemplary embodiment, the first power terminal may be a high level signal, and the first node a may be connected to a low level terminal of the gate driving circuit. The gate driving circuit may include a plurality of shift registers, and an output terminal of each of the shift registers is connected to one gate line. When the display panel works normally, one output end of the plurality of output ends of the grid driving circuit outputs high level, and the other output ends output low level, so that the pixels connected with the corresponding grid lines are started, and when the display panel is shut down, the output end of the grid driving circuit outputs signals of the low level end of the grid driving circuit. When the display panel is powered off, the logic input voltage starts to be powered off, when the logic input voltage is powered off to a first voltage threshold value, a signal of a first power supply end VGH is provided to the first node A, and the voltage of a low-level end of the grid driving circuit is pulled up to a voltage signal (high-level signal) of the first voltage end VGH, so that all output ends of the grid driving circuit output the voltage signal (high-level signal) of the voltage end VGH, all grid line connected pixels are started, pixel discharging is achieved, and shutdown afterimages can be eliminated. When the logic input voltage is powered down to the second voltage threshold, the signal of the ground terminal GND is provided to the first node a, that is, the signal of GND is provided to the low-level terminal of the gate driving circuit, so that all the output terminals of the gate driving circuit output the voltage of the ground terminal (zero voltage or near zero voltage), and the change along with the extension of the power-down time is smaller, the weak current electric field is smaller and more stable, the interference of the dc coupling electric field on the optimal Vcom setting is greatly reduced, and the improvement of the afterimage problem of the display system is realized.
In an exemplary embodiment, the first discharging sub-circuit is further configured to turn off the first power supply terminal VGH and the first node a when the logic input voltage of the display device is powered down to a second voltage threshold. For example, a suitable second voltage threshold may be selected, so that when the logic input voltage of the display device is powered down to the second voltage threshold, the first power supply terminal VGH and the first node a are turned off; or when the logic input voltage is powered down to the second voltage threshold, the control sub-circuit outputs a control signal to the control electrode of the first transistor T1 to turn off the first transistor T1, thereby turning off the first power supply terminal VGH and the first node a.
In an exemplary embodiment, the control sub-circuit may include a first control unit controlling the first discharge sub-circuit and a subsequent third discharge sub-circuit, and a second control unit controlling the second discharge sub-circuit, the first control unit, the second control unit may share a power supply with the driving IC of the display panel, or the first control unit may share a power supply with the driving IC of the display panel, and the second control unit may be controlled using an independent power supply. When the second control unit and the driving IC of the display panel share the power supply, the chip cannot work normally due to power failure to a certain extent, so that the second threshold voltage is larger than the lowest voltage of the chip to work normally, at this time, the duration from the power failure of the first threshold voltage to the second threshold voltage may be shorter, and the discharge of the display panel is insufficient, but the scheme is low in cost and economical. When the second control unit uses an independent power supply (independent from the power supply of the display panel) to control, a lower second voltage threshold can be set, the time from the power failure of the first voltage threshold to the second voltage threshold is longer, the display panel is convenient to fully discharge, and the effect of ghost elimination is better.
In an exemplary embodiment, the control sub-circuit may be provided externally of the display device or may be integrated in an integrated circuit chip of the display device.
In an exemplary implementation, the voltage signal of the first power supply terminal VGH may be an on voltage signal of the thin film transistor.
Fig. 3 is a schematic diagram of a first discharge sub-circuit according to an exemplary embodiment. As shown in fig. 3, the first discharging sub-circuit may include a first transistor T1, a control electrode of the first transistor T1 is connected to the control sub-circuit, a first electrode is connected to the first power supply terminal VGH, and a second electrode is connected to the first node a.
In an exemplary embodiment, the first transistor T1 is, for example, a P-type transistor, and when the logic input voltage is powered down to the first voltage threshold during the power-down process of the display device, the control sub-circuit outputs a low level signal to the control electrode of the first transistor T1, the first transistor T1 is turned on, and the voltage signal of the first power supply terminal VGH is applied to the first node a.
Fig. 4 is a schematic diagram of a second discharge sub-circuit provided in an exemplary embodiment. As shown in fig. 4, the second discharging sub-circuit may include: and a control electrode of the second transistor T2 is connected with the control sub-circuit, a first electrode of the second transistor T2 is connected with the first node A, and a second electrode of the second transistor T2 is connected with the ground end GND.
In an exemplary embodiment, the second transistor T2 is an N-type transistor, and when the logic input voltage is powered down to the second voltage threshold during the power-down process of the display device, the control sub-circuit outputs a high level signal to the control electrode of the second transistor T2, the second transistor T2 is turned on, and the voltage signal of the ground terminal GND is applied to the first node a.
Fig. 5 is a schematic diagram of a discharge circuit according to an exemplary embodiment. As shown in fig. 5, the discharging circuit may further include: a third discharging sub-circuit, which connects the control sub-circuit, the second power supply terminal VGL, and the first node a, wherein:
The control sub-circuit is further configured to output a third control signal to the third discharge sub-circuit when detecting that the display device is in a first state in a shutdown process; when the display device is detected to be started, outputting a fourth control signal to the third discharging sub-circuit;
the third discharging sub-circuit is configured to turn off the second power supply terminal VGL and the first node a when receiving the third control signal; and when the fourth control signal is received, the signal of the second power supply terminal VGL is provided to the first node A.
In an exemplary embodiment, the second power supply terminal VGL is, for example, a low level signal, and the third discharging sub-circuit provides the low level signal to the low level terminal of the display panel when the display device is powered up. When the display device is turned off, the second power supply terminal VGL and the first node a are turned off, so that the display panel is convenient to discharge.
Fig. 6 is a schematic diagram of a third discharge sub-circuit provided in an exemplary embodiment. The third discharging sub-circuit may include: and a third transistor T3, wherein a control electrode of the third transistor T3 is connected to the control sub-circuit, a first electrode is connected to the first node a, and a second electrode is connected to the second power supply terminal VGL.
In an exemplary embodiment, the second power supply terminal VGL is, for example, a low level signal, the third transistor is, for example, an N-type transistor, the control sub-circuit outputs a high level signal to the third transistor T3 when the display device is powered on, the third transistor T3 is turned on, the voltage of the second power supply terminal VGL is provided to the first node a, and the control sub-circuit outputs a low level signal to the control electrode of the third transistor T3 when the logic input voltage drops to the first voltage threshold during the power-down process of the display device, the third transistor T3 is turned off, and the second power supply terminal VGL is turned off between the second power supply terminal VGL and the first node a.
Exemplary structures of the first, second, and third discharge sub-circuits are given in the above embodiments. It is easily understood by those skilled in the art that the implementation of the first, second and third discharge sub-circuits is not limited thereto as long as the functions thereof can be implemented.
Fig. 7 is a schematic diagram of a discharge circuit according to an embodiment of the disclosure. As shown in fig. 7, the discharging circuit may include a control sub-circuit, a first discharging sub-circuit, a second discharging sub-circuit and a third discharging sub-circuit, where the first discharging sub-circuit includes a first transistor T1, a control electrode of the first transistor T1 is connected to the control sub-circuit, a first electrode is connected to the first power supply terminal VGH, a second electrode is connected to the first node a, the second discharging sub-circuit includes a second transistor T2, a control electrode of the second transistor T2 is connected to the control sub-circuit, a first electrode is connected to the first node a, a second electrode is connected to the ground terminal GND, the third discharging sub-circuit includes a third transistor T3, a control electrode of the third transistor T3 is connected to the control sub-circuit, a first electrode is connected to the first node a, a second electrode is connected to the second power supply terminal VGL, the first node a is connected to the equivalent unit 10, and the equivalent unit 10 is a circuit of a gate equivalent driving circuit and a display panel.
The following describes the technical scheme of the embodiment of the present application by taking the discharge circuit shown in fig. 7 as an example. In this embodiment, the first transistor T1 may be a P-type transistor, and the second transistor T2 and the third transistor T3 may be N-type transistors. The first power supply terminal VGH may be connected to a high level signal, and the second power supply terminal VGL may be connected to a low level signal.
In the shutdown process of the display device, when the logic input voltage of the display device is powered down to a first voltage threshold value, the control sub-circuit outputs a low-level signal to the first transistor T1, the first transistor T1 is started, the voltage of the first power supply end VGH is loaded to the first node A, and all output ends of the grid driving circuit output voltage signals (high level) of the first power supply end VGH, so that all pixels connected with grid lines are started, pixel discharge is realized, and shutdown afterimages can be eliminated. The control sub-circuit outputs a low-level signal to the third transistor T3, and turns off the third transistor T3; the control sub-circuit outputs a low-level signal to the second transistor T2, and the second transistor T2 is turned off;
When the logic input voltage is powered down to the second voltage threshold, the voltage of the first power supply terminal VGH cannot turn on the first transistor T1, the first transistor T1 is turned off, the third transistor T3 is kept turned off, the control sub-circuit outputs a high-level signal to the second transistor T2, the second transistor T2 is turned on, and the voltage of the ground terminal GND is loaded to the first node a, so that all the output terminals of the gate driving circuit output the voltage (zero voltage or near zero voltage) of the ground terminal GND, and the change along with the extension of the power-down time is smaller, so that the weak current electric field is smaller and more stable, the interference of the dc coupling electric field on the optimal Vcom setting is greatly reduced, and the improvement of the afterimage problem of the display system is realized.
When the second discharging sub-circuit is not arranged in the discharging circuit, the first transistor T1 is conducted after the power-down trigger XON (shutdown ghost elimination) is started when the display device is turned off, and the voltage of the first power supply end VGH is loaded to the first node A, so that the display panel discharges. In the power-down process, as the logic input voltage decreases, after the first transistor T1 is turned off, if the on condition of the third transistor T3 is satisfied, the third transistor T3 is turned on, and if the on condition of the third transistor T3 is not satisfied, the third transistor T3 is turned on, and at this time, the voltage of the first node a is not constant (floating), and after the third transistor T3 is turned on after the display device is powered on, the voltage of the second power supply terminal VGL is loaded to the first node a. In this scheme, after power-down, the voltage of the first node a may be the voltage of the second power supply terminal VGL, or may be unstable, and even if the voltage of the first node a is the voltage of the second power supply terminal VGL, the voltage of the second power supply terminal VGL is changed during power-down, so that the voltage of the first node a is finally unstable, resulting in an unstable weak current electric field, which is unfavorable for setting the optimal Vcom to improve the afterimage. In the scheme provided by the embodiment, after power-down, the voltage of the first node A is the voltage of the ground end GND, the voltage value is stable, and the weak direct current electric field after power-down of the display system is stabilized, so that the influence of the weak direct current electric field on the comprehensive electric field during power-up is greatly improved, and finally, the accurate and controllable setting of the optimal Vcom is realized, so that the purpose of improving the afterimage is achieved.
The embodiment of the disclosure also provides a display device, which comprises the discharge circuit provided by the embodiment. The display device may be: any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. The display device may further include a gate driving circuit and a display panel. The gate driving circuit may include a plurality of shift registers. The display device may be an Organic Light Emitting Diode (OLED) display device, a liquid crystal display device, or the like.
Fig. 8 is a flowchart of a discharging method according to an embodiment of the present disclosure, which is applied to the discharging circuit in the foregoing embodiment, and includes:
step 801, when detecting that the display device is in a first state in a shutdown process, outputting a first control signal to the first discharging sub-circuit; the first discharging sub-circuit provides a signal of the first power supply terminal to the first node, so that the gate driving circuit controls the display panel to discharge;
Step 802, outputting a second control signal to the second discharging sub-circuit when the display device is detected to be in a second state in the shutdown process; and when the second discharging electronic circuit receives the second control signal, the signal of the grounding end is provided to the first node.
According to the discharging method provided by the embodiment, after the power-off, a signal of the grounding end is provided for the first node, so that the output end of the grid driving circuit is stabilized at the voltage of the grounding end, the weak direct current electric field after the power-down of the display system is stabilized, the influence on the comprehensive electric field during the power-on process is greatly improved, and finally, the accurate and controllable setting of the optimal Vcom is realized, so that the aim of improving the afterimage is fulfilled.
In an exemplary embodiment, the first control signal is a low level signal, for example, and the second control signal is a high level signal, for example.
In an exemplary embodiment, the detecting that the display device is in a first state during shutdown includes: detecting that a logic input voltage of the display device is powered down to a first voltage threshold;
the detecting that the display device is in the second state in the shutdown process comprises: a power down of a logic input voltage of the display device to a second voltage threshold is detected, the second voltage threshold being less than the first voltage threshold.
In an exemplary embodiment, the discharging circuit may include a third discharging sub-circuit, and the discharging method further includes,
When the display device is detected to be started, outputting a fourth control signal to the third discharging sub-circuit; when the third discharging sub-circuit receives the fourth control signal, the signal of the second power supply end is provided for the first node;
When the display device is detected to be in a first state in the shutdown process, outputting a third control signal to the third discharging sub-circuit; and when the third discharging sub-circuit receives the third control signal, the second power supply end and the first node are turned off.
In an exemplary embodiment, the fourth control signal is, for example, a high level signal, and the third control signal is, for example, a low level signal.
Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.
Claims (11)
1. A discharge circuit for use in a display device including a display substrate and a gate driving circuit, the discharge circuit comprising: the control sub-circuit, first discharging sub-circuit and second discharging sub-circuit, first discharging sub-circuit is connected respectively control sub-circuit, first power end and first node, the second discharging sub-circuit is connected respectively control sub-circuit first node and ground connection, first node is connected to grid drive circuit, wherein:
The control sub-circuit is configured to output a first control signal to the first discharge sub-circuit when detecting that the display device is in a first state in a shutdown process; when the display device is detected to be in a second state in the shutdown process, outputting a second control signal to the second discharging sub-circuit;
the first discharging sub-circuit is configured to provide a signal of the first power supply terminal to the first node when receiving the first control signal, so that the gate driving circuit controls the pixels of the display substrate to discharge;
The second discharging sub-circuit is configured to provide the signal of the ground terminal to the first node upon receiving the second control signal.
2. The discharge circuit of claim 1, wherein the discharge circuit comprises a discharge circuit,
The detecting that the display device is in the first state in the shutdown process comprises: detecting that a logic input voltage of the display device is powered down to a first voltage threshold;
the detecting that the display device is in the second state in the shutdown process comprises: a power down of a logic input voltage of the display device to a second voltage threshold is detected, the second voltage threshold being less than the first voltage threshold.
3. The discharge circuit of claim 1, wherein the first discharge sub-circuit is further configured to turn off the first power supply terminal and the first node when a logic input voltage of the display device is powered down to a second voltage threshold.
4. The discharge circuit of claim 1, wherein the first discharge sub-circuit comprises: and a control electrode of the first transistor is connected with the control sub-circuit, a first electrode of the first transistor is connected with the first power supply end, and a second electrode of the first transistor is connected with the first node.
5. The discharge circuit of claim 1, wherein the second discharge sub-circuit comprises: and the control electrode of the second transistor is connected with the control sub-circuit, the first electrode is connected with the first node, and the second electrode is connected with the grounding end.
6. The discharge circuit of any one of claims 1 to 5, further comprising a third discharge sub-circuit, the third discharge sub-circuit connecting the control sub-circuit, the second power supply terminal, and the first node, wherein:
The control sub-circuit is further configured to output a third control signal to the third discharge sub-circuit when detecting that the display device is in a first state in a shutdown process; when the display device is detected to be started, outputting a fourth control signal to the third discharging sub-circuit;
The third discharging sub-circuit is configured to turn off the second power supply terminal and the first node when receiving the third control signal; and when the fourth control signal is received, the signal of the second power supply terminal is provided for the first node.
7. The discharge circuit of claim 6, wherein the third discharge sub-circuit comprises: and a third transistor, wherein a control electrode of the third transistor is connected with the control sub-circuit, a first electrode of the third transistor is connected with the first node, and a second electrode of the third transistor is connected with the second power supply end.
8. A display device comprising the discharge circuit according to any one of claims 1 to 7.
9. A discharge method applied to the discharge circuit as claimed in any one of claims 1 to 7, comprising:
When the display device is detected to be in a first state in the shutdown process, outputting a first control signal to the first discharging sub-circuit; the first discharging sub-circuit provides a signal of the first power supply end to the first node so that the gate driving circuit controls the display substrate to discharge;
when the display device is detected to be in a second state in the shutdown process, outputting a second control signal to the second discharging sub-circuit; and when the second discharging electronic circuit receives the second control signal, the signal of the grounding end is provided to the first node.
10. The discharge method according to claim 9, wherein,
The detecting that the display device is in the first state in the shutdown process comprises: detecting that a logic input voltage of the display device is powered down to a first voltage threshold;
the detecting that the display device is in the second state in the shutdown process comprises: a power down of a logic input voltage of the display device to a second voltage threshold is detected, the second voltage threshold being less than the first voltage threshold.
11. The discharge method according to claim 9, which is applied to the discharge circuit according to claim 6, further comprises,
When the display device is detected to be started, outputting a fourth control signal to the third discharging sub-circuit; when the third discharging sub-circuit receives the fourth control signal, the signal of the second power supply end is provided for the first node;
When the display device is detected to be in a first state in the shutdown process, outputting a third control signal to the third discharging sub-circuit; and when the third discharging sub-circuit receives the third control signal, the second power supply end and the first node are turned off.
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