CN113658556B - Voltage control circuit, control method and display device - Google Patents
Voltage control circuit, control method and display device Download PDFInfo
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- CN113658556B CN113658556B CN202110951094.0A CN202110951094A CN113658556B CN 113658556 B CN113658556 B CN 113658556B CN 202110951094 A CN202110951094 A CN 202110951094A CN 113658556 B CN113658556 B CN 113658556B
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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]
- G09G3/3225—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] using an active matrix
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0289—Details of voltage level shifters arranged for use in a driving circuit
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- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a voltage control circuit, a control method and a display device. The voltage of the set level can be output through the voltage adjusting circuit according to the current working time of the display panel and a pre-stored relation table between a plurality of different working times and the grid adjusting voltage. And outputting a driving clock signal having the voltage of the set level by the voltage conversion circuit according to the voltage of the set level. Therefore, the voltage of the set level in the driving clock signal can be adjusted according to the working time of the display panel, and when the threshold voltage Vth of the pixel transistor drifts along with the service time of the display panel, the pixel transistor can be started under the control of the scanning signal generated according to the voltage of the set level in the driving clock signal, so that the display stability is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a voltage control circuit, a control method, and a display device.
Background
The display panel has a scan driving circuit and sub-pixels having transistors therein. The scanning driving circuit is used for providing scanning signals for the pixel transistors in each row of sub-pixels to control the pixel transistors to be started, so that the display panel carries out line-by-line scanning under the action of the scanning signals. At the beginning of the pixel transistor, a data signal can be written into the corresponding sub-pixel to realize the picture display function. However, as the operation time of the display panel is prolonged, the threshold voltage Vth of the pixel transistor may drift, and the pixel transistor cannot be normally controlled to be turned on by the scanning signal, thereby causing abnormal image display.
Disclosure of Invention
The embodiment of the invention provides a voltage control circuit, which comprises:
the voltage adjusting circuit is configured to output a voltage of a set level according to the current working time of the display panel and a pre-stored relation table between a plurality of different working times and a grid electrode adjusting voltage;
a voltage conversion circuit configured to output a driving clock signal having the voltage of the set level according to the voltage of the set level; wherein the driving clock signal is configured to generate a scan signal.
In some examples, the voltage adjustment circuit is specifically configured to:
acquiring the current working time of the display panel in real time;
outputting grid electrode adjusting voltage corresponding to the current working duration according to the current working duration and a prestored relation table between a plurality of different working durations and the grid electrode adjusting voltage;
and outputting the voltage of the set level according to the grid adjustment voltage corresponding to the current working duration.
In some examples, a voltage feedback circuit is also included; the voltage feedback circuit is electrically connected with at least one driving output end of a scanning driving circuit in the display panel;
the voltage feedback circuit is configured to output a feedback voltage when the driving output terminal is at the voltage of the set level;
the voltage adjusting circuit is specifically configured to output the voltage of the set level according to the feedback voltage and the gate adjusting voltage corresponding to the current operating duration.
In some examples, the voltage feedback circuit includes: the feedback diode, the first feedback transistor, the second feedback transistor, the feedback capacitor, the first feedback resistor and the second feedback resistor;
the anode of the feedback diode is electrically connected with the driving output end, and the cathode of the feedback diode is electrically connected with the second pole of the first feedback transistor;
the first electrode of the first feedback transistor is electrically connected with a reset signal end, and the grid electrode of the first feedback transistor is electrically connected with a frame starting signal end;
the gate of the second feedback transistor is configured to receive the driving clock signal output by the voltage conversion circuit, the first pole of the second feedback transistor is electrically connected with the second pole of the first feedback transistor, and the second pole of the second feedback transistor is electrically connected with the first end of the first feedback resistor;
the second end of the first feedback resistor is electrically connected with the first end of the second feedback resistor;
the second end of the second feedback resistor is electrically connected with a grounding end;
the first end of the feedback capacitor is electrically connected with the first end of the first feedback resistor, and the second end of the feedback capacitor is electrically connected with the grounding end.
In some examples, the voltage adjustment circuit includes: the device comprises a time schedule controller, a digital-to-analog converter and a booster circuit;
the time schedule controller is configured to store a relation table between a plurality of different working durations and grid adjustment voltage and acquire the current working duration of the display panel in real time; outputting a digital signal of grid adjustment voltage corresponding to the current working duration according to the current working duration and a stored relation table between a plurality of different working durations and the grid adjustment voltage;
the digital-to-analog converter is configured to convert the digital signal of the gate adjustment voltage output by the timing controller into an analog signal and output the analog signal to the boost circuit;
the boost circuit is configured to output the voltage of the set level according to the feedback voltage and a gate adjustment voltage of an analog signal output by the digital-to-analog converter.
In some examples, the voltage conversion circuit is specifically configured to output the driving clock signal having the voltage of the set level according to the signal of the frame start signal terminal and the voltage of the set level.
The control method of the voltage control circuit provided by the embodiment of the invention comprises the following steps:
outputting a voltage of a set level according to the current working time of the display panel and a prestored relation table between a plurality of different working times and grid adjustment voltage;
outputting a driving clock signal with the voltage of the set level according to the voltage of the set level; wherein the driving clock signal is configured to generate a scan signal.
In some examples, the outputting a voltage of a set level according to the current operating time of the display panel and a pre-stored relationship table between a plurality of different operating times and a gate adjustment voltage specifically includes:
acquiring the current working time of the display panel in real time;
outputting grid electrode adjusting voltage corresponding to the current working duration according to the current working duration and a prestored relation table between a plurality of different working durations and the grid electrode adjusting voltage;
and outputting the voltage of the set level according to the grid adjustment voltage corresponding to the current working duration.
In some examples, further comprising: when the driving output end is the voltage of the set level, outputting a feedback voltage;
the outputting the voltage of the set level according to the gate adjustment voltage corresponding to the current working duration specifically includes: and outputting the voltage of the set level according to the feedback voltage and the grid adjustment voltage corresponding to the current working time.
The display device provided by the embodiment of the invention comprises a display panel and the voltage control circuit.
The voltage control circuit, the control method and the display device provided by the embodiment of the invention comprise a voltage adjusting circuit and a voltage converting circuit. The voltage of the set level can be output through the voltage adjusting circuit according to the current working time of the display panel and a pre-stored relationship table between a plurality of different working times and the grid adjusting voltage. And outputting a driving clock signal having the voltage of the set level by the voltage conversion circuit according to the voltage of the set level. Therefore, the voltage of the set level in the driving clock signal can be adjusted according to the working time of the display panel, and when the threshold voltage Vth of the pixel transistor drifts along with the service time of the display panel, the pixel transistor can be started under the control of the scanning signal generated according to the voltage of the set level in the driving clock signal, so that the display stability is improved.
Drawings
FIG. 1 is a schematic diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating some structures of a voltage control circuit according to an embodiment of the present invention;
FIG. 3 is another schematic diagram of a voltage control circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another exemplary embodiment of a voltage control circuit;
fig. 5 is a flowchart of a control method of the voltage control circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and the like, herein does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
an a-si TFT LCD (amorphous silicon Thin Film Transistor liquid crystal display panel 400), a p-si TFT LCD (low temperature polysilicon Thin Film Transistor liquid crystal display panel 400), and an AMOLED (active matrix organic light emitting diode panel) integrate a TFT (Thin Film Transistor) scan Driver circuit GA on an Array substrate of the display panel 400 by using a Gate Driver on Array (GOA) technology to form a scan Driver for the display panel 400.
In an embodiment of the present invention, as shown in fig. 1, the display panel 400 may include a display region and a non-display region. The display region may include a plurality of pixel units arranged in an array, a plurality of gate lines GT and a plurality of data lines DT, and the pixel unit may include a plurality of sub-pixels SPX. Illustratively, the pixel unit may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, so that color mixing may be performed by red, green, and blue to realize a color display. Alternatively, the pixel unit may also include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, so that color display may be realized by performing color mixing of red, green, blue, and white. Of course, in practical applications, the light emitting color of the sub-pixels in the pixel unit may be determined according to practical application environments, and is not limited herein.
In an embodiment of the present invention, as shown in fig. 1, each sub-pixel SPX may include a pixel transistor and a pixel electrode. One row of sub-pixels corresponds to one gate line GT, and one column of sub-pixels corresponds to one data line DT. In each sub-pixel, the gate electrode of the pixel transistor is electrically connected to the corresponding gate line GT, the source electrode of the pixel transistor is electrically connected to the corresponding data line, and the drain electrode of the pixel transistor is electrically connected to the corresponding pixel electrode.
In practical applications, if the pixel transistor is an N-type transistor, when the scan signal applied to the gate line GT is at a high level, the pixel transistor can be controlled to be turned on, so as to input the data signal transmitted on the data line to the pixel electrode. When the scanning signal applied to the gate line GT is at a low level, the pixel transistor may be controlled to be turned off, so that the pixel electrode keeps storing the signal.
In practical applications, if the pixel transistor is a P-type transistor, when the scan signal applied to the gate line GT is at a low level, the pixel transistor can be controlled to be turned on, so as to input the data signal transmitted on the data line to the pixel electrode. When the scanning signal applied to the gate line GT is at a high level, the pixel transistor may be controlled to be turned off, so that the pixel electrode keeps storing the signal.
In the embodiment of the present invention, as shown in fig. 1, the non-display area may include a plurality of circuits with different functions, for example, may have a scan driving circuit GA. The scan driving circuit GA may be electrically connected to the plurality of gate lines GT to input a scan signal to each gate line GT. Illustratively, the scan driving circuit GA may include a plurality of shift register cells arranged in cascade. Each shift register cell has a drive output terminal, and the drive output terminal of one shift register cell is electrically connected to one gate line GT to input a scan signal to the electrically connected gate line GT through the shift register cell. It should be noted that the working process of the shift register unit in the scan driving circuit GA may be substantially the same as that in the prior art, and is not described herein again.
In practical applications, a driving clock signal may be input to the scan driving circuit GA, and the output transistor in each shift register may provide the driving clock signal to the driving output terminal under the control of the gate signal thereof to output the scan signal. The voltage control circuit in the embodiment of the invention is used for outputting the driving clock signal.
As shown in fig. 2, the voltage control circuit provided in the embodiment of the present invention may include:
a voltage adjusting circuit 100 configured to output a voltage of a set level according to a current operating time of the display panel 400 and a pre-stored relationship table between a plurality of different operating times and a gate adjustment voltage;
a voltage conversion circuit 200 configured to output a driving clock signal having a voltage of a set level according to the voltage of the set level; wherein the driving clock signal is configured to generate the scan signal.
The voltage control circuit provided by the embodiment of the invention can comprise a voltage adjusting circuit and a voltage converting circuit. The voltage of the set level can be output through the voltage adjusting circuit according to the current working time of the display panel and a pre-stored relationship table between a plurality of different working times and the grid adjusting voltage. And outputting a driving clock signal having the voltage of the set level by the voltage conversion circuit according to the voltage of the set level. Therefore, the voltage of the set level in the driving clock signal can be adjusted according to the working time of the display panel, and the pixel transistor can be started under the control of the scanning signal generated according to the voltage of the set level in the driving clock signal when the threshold voltage Vth of the pixel transistor drifts along with the service time of the display panel, so that the situation that the display panel has horizontal stripes is reduced, and the display stability is improved.
In practical applications, the scan driving circuit GA may be formed by a scan transistor and a capacitor. As the operation time of the display panel is extended, the threshold voltage Vth of the scan transistor also drifts, resulting in insufficient driving capability of the scan transistor. Especially, when the scan transistor is an oxide transistor, the driving capability of the scan transistor is insufficient due to Vth drift, which may cause the scan driving circuit to fail, and thus, may cause the display panel to have a horizontal stripe problem. In the embodiment of the invention, the voltage of the set level in the driving clock signal can be adjusted according to the working time of the display panel, so that when the threshold voltage Vth of the scanning transistor drifts along with the service time of the display panel, the voltage of the set level in the driving clock signal can be provided for the driving output end, so that the scanning signal with the voltage of the set level is input to the grid line, the situation that the display panel has horizontal stripes is reduced, and the display stability is improved.
It should be noted that the driving clock signal may be a clock signal that alternately switches between a high level and a low level. When the pixel transistor is an N-type transistor, the set level in the driving clock signal may be a high level. When the pixel transistor is a P-type transistor, the set level in the driving clock signal may be a low level.
In the embodiment of the present invention, the pre-stored relationship table between a plurality of different operating durations and the gate adjustment voltage may include a plurality of gate adjustment voltages corresponding to the different operating durations and each operating duration. In some examples, the plurality of different operation time periods may be a total time period since the display panel 400 starts operating. Illustratively, the plurality of different operation periods may be made to be operation periods that occur sequentially according to time. For example, the plurality of different operating periods may include M operating periods: the working time length A _1, the working time length A _2 and the working time length A _3 \8230, the working time length A _ M (M is more than or equal to 1 and less than or equal to M, M and M are integers, and M is more than 0) \8230, the working time length A _ M8230and the working time length A _ M. For example, M =4 may be provided, and the operating time length a _1, the operating time length a _2, the operating time length a _3, and the operating time length a _4 may be provided. Moreover, the working time length A4 is greater than the working time length A3, the working time length A3 is greater than the working time length A2, and the working time length A2 is greater than the working time length A1. The working duration A1 appears first, the working duration A2 appears after the working duration A1, the working duration A3 appears after the working duration A2, and the working duration A4 appears after the working duration A3.
In the embodiment of the present invention, in the sequentially occurring operating time periods, the interval time between every two adjacent operating time periods is the same. For example, a _1=100h, a _2=500h, a _3=1000h, a _4=1500h.
In the embodiment of the present invention, the gate adjustment voltage B _ m corresponding to the operating time length a _ m in the relationship table may be VGH0+ Vth _ m. VGH0 represents the voltage in the scan signal when the threshold voltage Vth of the pixel transistor is not shifted, so that the pixel transistor is turned on under the control of the VGH0 voltage when the threshold voltage Vth of the pixel transistor is not shifted. Vth _ m represents a voltage after the threshold voltage Vth of the pixel transistor shifts when the corresponding operation time is long. For example, the gate adjustment voltage B _1 corresponding to the operating duration a _1 may be VGH0+ Vth _1, the gate adjustment voltage B _2 corresponding to the operating duration a _2 may be VGH0+ Vth _2, the gate adjustment voltage B _3 corresponding to the operating duration a _3 may be VGH0+ Vth _3, and the gate adjustment voltage B _4 corresponding to the operating duration a _4 may be VGH0+ Vth _4.
In an embodiment of the present invention, the voltage regulation circuit 100 is specifically configured to: acquiring the current working time of the display panel 400 in real time; outputting grid electrode adjusting voltage corresponding to the current working time length according to the current working time length and a prestored relation table between a plurality of different working time lengths and the grid electrode adjusting voltage; and outputting the voltage of the set level according to the grid adjustment voltage corresponding to the current working time. By obtaining the current operating time of the display panel 400, the relationship table between the grid adjustment voltages and a plurality of different operating times stored in advance can be queried according to the current operating time to find the grid adjustment voltage corresponding to the current operating time, and then the output voltage of the set level can be adjusted according to the grid adjustment voltage, so that the voltage of the set level required by the current operating time can be output. And then the scanning signal is generated according to the adjusted voltage of the set level, so that the pixel transistor can be controlled to be normally started, and the display stability is improved.
In the embodiment of the present invention, as shown in fig. 3, the voltage control circuit further includes a voltage feedback circuit 300; the voltage feedback circuit 300 is electrically connected to a driving output terminal of the scan driving circuit GA in the display panel 400. That is, the voltage feedback circuit 300 is electrically connected to the driving output terminal of one shift register unit in the scan driving circuit GA. Also, the voltage feedback circuit 300 is configured to output a feedback voltage when the driving output terminal is a voltage of a set level. And, the voltage adjusting circuit 100 is specifically configured to output a voltage of a set level according to the feedback voltage and the gate adjusting voltage corresponding to the current operating time.
Alternatively, in the embodiment of the present invention, the voltage feedback circuits 300 corresponding to each other may be provided for two driving output terminals in the scan driving circuit GA. That is, the voltage feedback circuit 300 may be provided in two. One voltage feedback circuit 300 of the two voltage feedback circuits 300 is electrically connected to one driving output terminal, and the other voltage feedback circuit 300 is electrically connected to the other driving output terminal.
Alternatively, in the embodiment of the present invention, the voltage feedback circuits 300 corresponding to each other may be respectively disposed for each driving output terminal in the scan driving circuit GA. That is, the number of the voltage feedback circuits 300 is the same as the number of the shift registers. And electrically connects each of the voltage feedback circuits 300 with its corresponding driving output terminal.
In the embodiment of the present invention, the number of the voltage feedback circuits 300 may be determined according to the requirements of the practical application, and is not limited herein.
In the embodiment of the present invention, as shown in fig. 4, the voltage adjustment circuit 100 includes: timing controller 110, digital-to-analog converter 120, and boost circuit 130. The timing controller 110 is configured to store a relationship table between a plurality of different operating durations and the gate adjustment voltage, and obtain a current operating duration of the display panel 400 in real time; and outputting a digital signal of the grid electrode adjusting voltage corresponding to the current working time length according to the current working time length and a stored relation table between a plurality of different working time lengths and the grid electrode adjusting voltage. The digital-to-analog converter 120 is configured to convert a digital signal of the gate adjustment voltage output from the timing controller 110 into an analog signal and output the analog signal to the voltage boost circuit 130. And the boosting circuit 130 is configured to output a voltage of a set level according to the feedback voltage and the gate adjustment voltage of the analog signal output by the digital-to-analog converter 120. Illustratively, the voltage Boost circuit 130 may be, for example, a Boost circuit.
In the embodiment of the present invention, as shown in fig. 4, the voltage converting circuit 200 is further electrically connected to the frame start signal terminal STV. Also, the voltage conversion circuit 200 is specifically configured to output a driving clock signal having a voltage of a set level according to a signal of the frame start signal terminal STV and the voltage of the set level.
In an embodiment of the present invention, as shown in fig. 4, the voltage feedback circuit 300 may include: the feedback circuit comprises a feedback diode D1, a first feedback transistor M1, a second feedback transistor M2, a feedback capacitor C1, a first feedback resistor R1 and a second feedback resistor R2. The anode of the feedback diode D1 is electrically connected to the driving output terminal, and the cathode of the feedback diode D1 is electrically connected to the second pole of the first feedback transistor M1. A first pole of the first feedback transistor M1 is electrically connected to the reset signal terminal RS, and a gate of the first feedback transistor M1 is electrically connected to the frame start signal terminal STV. The gate of the second feedback transistor M2 is configured to receive the driving clock signal output by the voltage conversion circuit 200, the first pole of the second feedback transistor M2 is electrically connected to the second pole of the first feedback transistor M1, and the second pole of the second feedback transistor M2 is electrically connected to the first end of the first feedback resistor R1. The second end of the first feedback resistor R1 is electrically connected with the first end of the second feedback resistor R2. The second end of the second feedback resistor R2 is electrically connected to the ground. The first end of the feedback capacitor C1 is electrically connected to the first end of the first feedback resistor R1, and the second end of the feedback capacitor C1 is electrically connected to the ground terminal.
For example, the voltage drop of the feedback diode D1, the resistance value of the first feedback resistor R1, and the resistance value of the second feedback resistor R2 may be designed and determined according to the requirement of practical application, and are not limited herein.
As shown in fig. 5, the method for controlling a voltage control circuit according to an embodiment of the present invention may include the following steps:
s10, outputting a voltage of a set level according to the current working time of the display panel and a pre-stored relation table between a plurality of different working times and grid adjustment voltage;
s20, outputting a driving clock signal with the voltage of the set level according to the voltage of the set level; wherein the driving clock signal is configured to generate the scan signal.
In a specific implementation, in the embodiment of the present invention, outputting the voltage of the set level according to the current operating time of the display panel 400 and a pre-stored relationship table between a plurality of different operating times and the gate adjustment voltage may specifically include: the current operating time of the display panel 400 is acquired in real time. And outputting the grid electrode adjusting voltage corresponding to the current working time according to the current working time and a prestored relation table between a plurality of different working times and the grid electrode adjusting voltage. And outputting the voltage of the set level according to the grid adjusting voltage corresponding to the current working time.
In specific implementation, in the embodiment of the present invention, the control method may further include: and when the driving output end is the voltage of the set level, outputting the feedback voltage. And, according to the grid adjustment voltage corresponding to the present working duration, output the voltage of the set level, include specifically: and outputting the voltage of the set level according to the feedback voltage and the grid adjusting voltage corresponding to the current working time.
The voltage control circuit shown in fig. 4 and the setting level is high for example, and the present invention will be described in detail with reference to the specific embodiments. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
The embodiment of the invention provides a control method of a voltage control circuit, which comprises the following steps:
when the display panel 400 is running, the Timing Controller 110 may perform Timing processing, so as to record the working time of the display panel 400 from the beginning of running to the present, so that the Timing Controller 110 (Timing Controller) may obtain the current working time of the display panel 400 in real time. For example, the acquired current operation time length is a _2.
The timing controller 110 may find out, according to the current operating time length a _2, a gate adjustment voltage B _2 corresponding to the current operating time length a _2 from a stored relationship table between a plurality of different operating time lengths and gate adjustment voltages. And outputs the gate adjustment voltage B _2 to the digital-to-analog converter 120 in the form of a digital signal.
The digital-to-analog converter 120 may receive the gate adjustment voltage B _2 in the form of a digital signal output from the timing controller 110, perform digital-to-analog conversion on the gate adjustment voltage B _2 in the form of a digital signal to form the gate adjustment voltage B _2 in the form of an analog signal, and output the gate adjustment voltage B _2 in the form of an analog signal to the voltage boost circuit 130.
The boost circuit 130 may boost the voltage of the voltage input terminal VIN according to the gate adjustment voltage B _2 in the form of an analog signal output by the digital-to-analog converter 120, and then output a high-level voltage VH _2 corresponding to the gate adjustment voltage B _2. The high-level voltage VH _2 controls the second feedback transistor M2 to turn on, and the high-level voltage VH _2 is input to the scan driving circuit GA of the display panel 400, so that the scan driving circuit GA can output a scan signal. When the scan signal is the high-level voltage VH _2', the feedback capacitor C1 may be charged by the high-level voltage VH _2' of the scan signal through the feedback diode D1 and the second feedback transistor M2, so that the voltage across the feedback capacitor C1 is the high-level voltage VH _2' of the scan signal. Due to the voltage division of the first feedback resistor R1 and the second feedback resistor R2, the voltage at the node N0 may be R2 × VH _ 2'/(R1 + R2). The voltage r2 × VH _2 '/(r 1+ r 2) is input to the negative feedback port FB of the booster circuit 130, and the booster circuit 130 can finely adjust the high-level voltage VH _2 output from the gate adjustment voltage B _2 based on the voltage r2 × VH _2 '/(r 1+ r 2) until the voltage r2 × VH _2 '/(r 1+ r 2) is equal to VH _2 within the error tolerance range, whereby the voltage output from the booster circuit 130 can be stabilized to the high-level voltage VH _2. Wherein R1 represents the resistance of the first feedback resistor R1, and R2 represents the resistance of the second feedback resistor R2. The node N0 is located at the junction between the first feedback resistor R1 and the second feedback resistor R2.
The frame start signal terminal STV may be a control signal for the display panel 400 to start scanning one frame of picture. When the frame start signal terminal STV is high, it represents that one frame scanning starts. After the frame start signal terminal STV is converted from the high level to the low level, the scan driving circuit GA sequentially outputs the scan signals, so that the display panel 400 performs the progressive scanning under the action of the scan signals.
When the frame start signal terminal STV is at a high Level, the first feedback transistor M1 may be controlled to be turned on, and at this time, the voltage conversion circuit 200 (Level Shift) also outputs a voltage at a high Level, and the second feedback transistor M2 may be controlled to be turned on. The voltage of the reset signal terminal RS is input to the feedback capacitor C1 through the turned-on first feedback transistor M1 and second feedback transistor M2, and the feedback capacitor C1 is initialized. And, the voltage of the reset signal terminal RS is not input to the display panel 400 due to the feedback diode D1.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises the voltage control circuit and the display panel provided by the embodiment of the invention. The principle of the display device to solve the problem is similar to the voltage control circuit, so the implementation of the display device can refer to the implementation of the voltage control circuit, and repeated parts are not described herein again.
In specific implementation, in the embodiment of the present invention, the display device may be: any product or component with a 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. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
The voltage control circuit, the control method and the display device provided by the embodiment of the invention comprise a voltage adjusting circuit and a voltage converting circuit. The voltage of the set level can be output through the voltage adjusting circuit according to the current working time of the display panel and a pre-stored relation table between a plurality of different working times and the grid adjusting voltage. And outputting a driving clock signal having the voltage of the set level by the voltage conversion circuit according to the voltage of the set level. Therefore, the voltage of the set level in the driving clock signal can be adjusted according to the working time of the display panel, and when the threshold voltage Vth of the pixel transistor drifts along with the service time of the display panel, the pixel transistor can be started under the control of the scanning signal generated according to the voltage of the set level in the driving clock signal, so that the display stability is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A voltage control circuit, comprising:
the voltage adjusting circuit is configured to output a voltage of a set level according to the current working time of the display panel and a pre-stored relation table between a plurality of different working times and the grid electrode adjusting voltage;
a voltage conversion circuit configured to output a driving clock signal having the voltage of the set level according to the voltage of the set level; wherein the driving clock signal is configured to generate a scan signal;
wherein the voltage adjustment circuit is specifically configured to:
acquiring the current working time of the display panel in real time;
outputting grid electrode adjusting voltage corresponding to the current working duration according to the current working duration and a prestored relation table between a plurality of different working durations and the grid electrode adjusting voltage;
outputting the voltage of the set level according to the grid adjustment voltage corresponding to the current working duration;
the device also comprises a voltage feedback circuit; the voltage feedback circuit is respectively and electrically connected with at least one driving output end, a reset signal end and a frame starting signal end of a scanning driving circuit in the display panel;
the voltage feedback circuit is configured to output a feedback voltage when the driving output end is the voltage of the set level, and reset according to a frame start signal, the driving clock signal and a reset signal;
the voltage adjusting circuit is specifically configured to output the voltage of the set level according to the feedback voltage and the gate adjusting voltage corresponding to the current operating time.
2. The voltage control circuit of claim 1, wherein the voltage feedback circuit comprises: the feedback diode, the first feedback transistor, the second feedback transistor, the feedback capacitor, the first feedback resistor and the second feedback resistor;
the positive electrode of the feedback diode is electrically connected with the driving output end, and the negative electrode of the feedback diode is electrically connected with the second electrode of the first feedback transistor;
a first electrode of the first feedback transistor is electrically connected with the reset signal end, and a grid electrode of the first feedback transistor is electrically connected with the frame starting signal end;
the grid electrode of the second feedback transistor is configured to receive the driving clock signal output by the voltage conversion circuit, the first pole of the second feedback transistor is electrically connected with the second pole of the first feedback transistor, and the second pole of the second feedback transistor is electrically connected with the first end of the first feedback resistor;
the second end of the first feedback resistor is electrically connected with the first end of the second feedback resistor;
the second end of the second feedback resistor is electrically connected with a grounding end;
the first end of the feedback capacitor is electrically connected with the first end of the first feedback resistor, and the second end of the feedback capacitor is electrically connected with the grounding end.
3. The voltage control circuit of claim 2, wherein the voltage adjustment circuit comprises: the device comprises a time schedule controller, a digital-to-analog converter and a booster circuit;
the time schedule controller is configured to store a relation table between a plurality of different working durations and grid adjustment voltage, and obtain the current working duration of the display panel in real time; outputting a digital signal of grid adjustment voltage corresponding to the current working duration according to the current working duration and a stored relation table between a plurality of different working durations and the grid adjustment voltage;
the digital-to-analog converter is configured to convert the digital signal of the gate adjustment voltage output by the timing controller into an analog signal and output the analog signal to the boost circuit;
the boost circuit is configured to output the voltage of the set level according to the feedback voltage and a gate adjustment voltage of an analog signal output by the digital-to-analog converter.
4. The voltage control circuit according to any of claims 1-3, wherein the voltage conversion circuit is specifically configured to output the driving clock signal having the voltage of the set level according to the signal of the frame start signal terminal and the voltage of the set level.
5. A control method of a voltage control circuit according to any one of claims 1 to 4, comprising:
outputting a voltage of a set level according to the current working time of the display panel and a prestored relation table between a plurality of different working times and grid adjustment voltage;
outputting a driving clock signal having the voltage of the set level according to the voltage of the set level; wherein the driving clock signal is configured to generate a scan signal.
6. The method according to claim 5, wherein the outputting the voltage of the set level according to the current operating time of the display panel and a pre-stored relationship table between a plurality of different operating time lengths and the gate adjustment voltage comprises:
acquiring the current working time of the display panel in real time;
outputting grid electrode adjusting voltage corresponding to the current working duration according to the current working duration and a prestored relation table between a plurality of different working durations and the grid electrode adjusting voltage;
and outputting the voltage of the set level according to the grid adjustment voltage corresponding to the current working duration.
7. The control method according to claim 6, further comprising: when the driving output end is the voltage of the set level, outputting a feedback voltage;
the outputting the voltage of the set level according to the gate adjustment voltage corresponding to the current working duration specifically includes: and outputting the voltage of the set level according to the feedback voltage and the grid electrode adjusting voltage corresponding to the current working time.
8. A display device comprising a display panel and the voltage control circuit according to any one of claims 1 to 4.
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| US8253721B2 (en) * | 2006-11-28 | 2012-08-28 | Lg Display Co., Ltd. | Liquid crystal display device including source voltage generator and method of driving liquid crystal display device |
| KR101327491B1 (en) * | 2006-11-28 | 2013-11-08 | 엘지디스플레이 주식회사 | Power generation unit for liquid crystal display device |
| JP4277055B2 (en) * | 2007-05-29 | 2009-06-10 | シャープ株式会社 | Drive circuit, display device, and television system |
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| CN104318903B (en) * | 2014-11-19 | 2018-05-18 | 京东方科技集团股份有限公司 | Driving power, pixel unit drive circuit and organic light emitting display |
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| CN105243990B (en) * | 2015-10-12 | 2018-07-31 | 中航华东光电有限公司 | Driving circuit for OLED display screen and method with an automatic light meter |
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| CN109599069B (en) * | 2017-09-30 | 2022-05-17 | 北京小米移动软件有限公司 | Image display method and device |
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