CN110176218B - Drive circuit and display device - Google Patents
Drive circuit and display device Download PDFInfo
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- CN110176218B CN110176218B CN201910371104.6A CN201910371104A CN110176218B CN 110176218 B CN110176218 B CN 110176218B CN 201910371104 A CN201910371104 A CN 201910371104A CN 110176218 B CN110176218 B CN 110176218B
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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Abstract
The present application relates to a driving circuit and a display device. The driving circuit comprises a power chip, a timing module and a control module. The power supply chip is used for outputting the grid voltage. The timing module is used for calculating the total working time of the driving circuit. The control module is electrically connected with the timing module. The control module controls the power supply chip to output corresponding grid voltage according to the total working time. The longer the total working time is, the larger the grid voltage output by the power supply chip is. The display device using the driving circuit effectively makes up the insufficient charging caused by the aging of the thin film transistor, and further effectively prevents the brightness of the display device from becoming dark after the display device is used for a long time.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a driving circuit and a display device.
Background
With the development of display technology, various display devices (e.g., liquid crystal televisions) are used in the production and life of people to provide convenience to people. Each imaging sub-pixel of the display device is typically driven by a Thin Film Transistor (TFT). The TFT display device has advantages such as high responsivity, high brightness, and high contrast, and thus is currently the mainstream display device.
However, thin film transistors inside the display device gradually deteriorate with long-term use. This may result in insufficient charging of the sub-pixels for displaying, which may cause a dark display problem, and may further affect the service life of the device.
Disclosure of Invention
In view of the above, it is desirable to provide a display device and a driving circuit thereof capable of preventing a display from becoming dark after long-term use.
A drive circuit, comprising:
the power supply chip is used for outputting grid voltage;
the timing module is used for calculating the total working time of the driving circuit;
the control module is electrically connected with the timing module;
the control module controls the power supply chip to output corresponding grid voltage according to the total working duration; the longer the total working time is, the larger the gate voltage output by the power supply chip is.
In one of the embodiments, the first and second electrodes are,
the driving circuit further comprises a grid voltage storage module, the grid voltage storage module comprises at least one voltage storage area which is electrically connected with the control module, and the voltage storage area is used for storing grid voltage codes;
the power supply chip comprises a digital-to-analog conversion module, and the digital-to-analog conversion module is used for converting the grid voltage code into grid voltage and outputting the grid voltage;
and the control module selectively conducts the corresponding voltage storage area and the digital-to-analog conversion module according to the total working duration so as to output the corresponding grid voltage.
In one of the embodiments, the first and second electrodes are,
and the control module is used for reading the grid voltage codes of the corresponding voltage storage area according to the total working duration and transmitting the corresponding grid voltage codes to the digital-to-analog conversion module.
In one of the embodiments, the first and second electrodes are,
the driving circuit further comprises a switch module, the switch module comprises switch units, the number of the switch units is the same as that of the voltage storage areas, and the switch units and the voltage storage areas are arranged in a one-to-one correspondence mode and are electrically connected to the corresponding voltage storage areas;
the control module controls to close the corresponding switch unit according to the total working time calculated by the timing module, and the corresponding switch unit conducts the corresponding voltage storage area and the digital-to-analog conversion module so as to output the corresponding grid voltage.
In one of the embodiments, the first and second electrodes are,
the timing module comprises a timing unit and a nonvolatile memory;
the timing unit and the nonvolatile memory are electrically connected to the control module, and the nonvolatile memory is used for storing the timing of the timing module;
when the driving circuit is started, the control module reads the timing stored in the nonvolatile memory and controls the timing unit to continue to accumulate the timing on the basis of the read timing, and when the driving circuit is closed, the control module stores the timing of the timing unit in the nonvolatile memory.
In one of the embodiments, the first and second electrodes are,
the power supply chip is also used for outputting timing power supply voltage;
the control module is also used for detecting the timing power supply voltage; when the voltage detected by the control module is equal to the timing power supply voltage, the control module reads the timing stored in the nonvolatile memory, controls the timing unit to continue to accumulate and time on the basis of the read timing, and when the voltage detected by the control module is smaller than the timing power supply voltage, the control module stores the timing of the timing unit in the nonvolatile memory.
In one embodiment, the driving circuit further includes a timing control chip, the control module is located in the timing control chip, and the timing power voltage is a power voltage of the timing control chip.
In one of the embodiments, the first and second electrodes are,
the timing unit comprises a sampling clock and a counter, the sampling clock and the counter are electrically connected to the control module, and the nonvolatile memory is used for storing the count of the counter;
the sampling clock is used for providing a detection frequency for the control module, and the control module detects the timing power supply voltage according to the detection frequency;
when the voltage detected by the control module is equal to the timing power supply voltage, the control module reads the count stored in the nonvolatile memory and controls the counter to continue accumulating the count on the basis of the read count, and when the voltage detected by the control module is equal to the timing power supply voltage, the control module stores the count in the counter into the nonvolatile memory.
A drive circuit, comprising:
the timing control chip comprises a control module, a sampling clock, a counter, a nonvolatile memory and at least one voltage storage area, wherein the voltage storage area is used for storing grid voltage codes, and the sampling clock, the counter, the nonvolatile memory and each voltage storage area are electrically connected with the control module;
the power supply chip comprises a digital-to-analog conversion module, the digital-to-analog conversion module is used for converting the grid voltage code into grid voltage to be output, and the power supply chip is also used for outputting the power supply voltage of the time sequence control chip;
the sampling clock is used for providing a detection frequency for the control module, and the control module detects the power supply voltage of the time sequence control chip according to the detection frequency;
when the voltage detected by the control module is equal to the power supply voltage of the time sequence control chip, the control module reads the count stored in the nonvolatile memory and controls the counter to continue accumulating the count on the basis of the read count, and when the voltage detected by the control module is smaller than the power supply voltage of the time sequence control chip, the control module stores the count in the counter into the nonvolatile memory;
the control module reads the grid voltage codes of the corresponding voltage storage area according to the total count value of the counter, and converts the corresponding grid voltage codes into corresponding grid voltage through the digital-to-analog conversion module for output; the larger the total count value is, the larger the gate voltage output by the power supply chip is.
A display device comprising a display panel and the driver circuit of any one of claims 1 to 9, the driver circuit being for driving the display panel.
According to the driving circuit, the timing module and the control module are additionally arranged, so that the control module can control the power supply chip to output the corresponding grid voltage according to the total working time calculated by the timing module. The longer the total working time is, the larger the grid voltage output by the power supply chip is. Therefore, the channel resistance of the display panel driven by the driving circuit is reduced along with the increase of the grid voltage when the thin film transistor works, and the impedance increase caused by the aging of the thin film transistor can be effectively compensated. Therefore, the display device using the driving circuit effectively makes up for insufficient charging caused by aging of the thin film transistor, and further effectively prevents the brightness of the display device from becoming dark after the display device is used for a long time.
Drawings
FIG. 1 is a schematic diagram of a display device in one embodiment;
FIG. 2 is a schematic diagram of a display panel in one embodiment;
FIG. 3 is a schematic diagram of a driving circuit in one embodiment;
FIG. 4 is a schematic diagram of a driving circuit in another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The display device provided by the application can be applied to liquid crystal televisions, computers and the like.
In one embodiment, referring to fig. 1, the display device includes a display panel 100 and a driving circuit 200 driving the display panel 100.
Referring to fig. 2, the display panel 100 includes a plurality of sub-pixels 110 of various colors, such as: red sub-pixel R, green sub-pixel G and blue sub-pixel B. Meanwhile, the display panel 100 further includes a plurality of thin film transistors 120 for driving the respective sub-pixels 110. Specifically, a pixel electrode (not shown) of each sub-pixel 110 is connected to a drain electrode of the corresponding thin film transistor 120. Meanwhile, the gate of each tft 120 receives a gate voltage, thereby turning on the corresponding sub-pixel 110. The source of each tft 120 receives a source voltage to charge the corresponding sub-pixel 110.
The driving circuit 200 drives the display panel 100 to display, and provides the display panel 100 with a gate voltage and a source voltage.
In one embodiment, referring to fig. 3, the driving circuit 200 includes a power chip 210. The power supply chip 210 is used to output a gate voltage and a power supply voltage of other parts of the driving circuit (e.g., a gamma chip (not shown), the timing control chip 220, etc.).
In addition, the driving circuit 200 of the present embodiment further includes a timing module 221 and a control module 222. The timing module 221 is used for calculating the total operating time of the driving circuit 200. The control module 222 is electrically connected to the timing module 221, and further can obtain the total working time of the driving circuit 200 calculated by the timing module. The control module 222 may control a voltage output mode of the power chip 210.
In the present embodiment, the control module 222 controls the power chip 210 to output the corresponding gate voltage according to the total operating time of the driving circuit 200. The longer the total operation time of the driving circuit 200 is, the larger the gate voltage output from the power supply chip 210 is.
Therefore, the channel resistance of the display panel driven by the driving circuit is reduced along with the increase of the grid voltage when the thin film transistor works, and the impedance increase caused by the aging of the thin film transistor can be effectively compensated. Therefore, the display device using the driving circuit effectively makes up for insufficient charging caused by aging of the thin film transistor, and further effectively prevents the brightness of the display device from becoming dark after the display device is used for a long time.
The conventional driving circuit 200 generally further includes a timing control chip 220 for controlling output timings of the gate voltage and the source voltage. The timing module 221 and the control module 222 of the embodiment of the present application may be both located in the timing control chip 220. At this time, the control module 222 may be modified by a Micro Control Unit (MCU) in the conventional timing control chip 220, so as to increase system compatibility. Of course, the timing module 221 and/or the control module 222 may not be disposed in the timing control chip 220 (for example, the timing module 221 and the control module 222 are both disposed in the power chip 210), and the disclosure is not limited thereto.
In one embodiment, the driving circuit 200 further includes a gate voltage storage module 223. The gate voltage storage module 223 includes at least one voltage storage area 2231, and the voltage storage area 2231 is used for storing a gate voltage code. The gate voltage storage module 223 may also be located within the timing control chip 220. Of course, the gate voltage storage module 223 may be located in other positions (e.g., within the power chip 210).
In order to cooperate with the gate voltage storage module 223, a digital-to-analog conversion module 211 is further disposed in the power chip 210 of this embodiment. The digital-to-analog conversion module 211 may convert the gate voltage code of each voltage storage area 2231 into a gate voltage and output the gate voltage.
Meanwhile, in the present embodiment, each voltage storage area 2231 of the gate voltage storage module 223 is electrically connected to the control module 222, and can be controlled by the control module 222. At this time, the control module 222 selectively turns on the corresponding voltage storage region 2231 and the digital-to-analog conversion module 211 according to the total operating time of the driving circuit 200, and further outputs the corresponding gate voltage, so that the control module 222 controls the power chip 210 to output the corresponding gate voltage according to the total operating time.
Specifically, when the timing module 221 calculates that the total operating time of the driving circuit 200 reaches the first standard, the control module 222 selects a first voltage storage area 2231 from the gate voltage storage module 223, and then turns on the voltage storage area 2231 and the digital-to-analog conversion module 211, so as to output the gate voltage corresponding to the gate voltage code in the voltage storage area 2231. When the timing module 221 calculates that the total operating time of the driving circuit 200 reaches the second standard, the control module 222 selects the second voltage storage area 2231 from the gate voltage storage module 223, and then turns on the voltage storage area 2231 and the digital-to-analog conversion module 211, so as to output the gate voltage corresponding to the gate voltage code in the voltage storage area 2231. The same reasoning is followed by analogy.
It should be noted that before the total operating time of the driving circuit 200 reaches the first standard, the initial gate voltage output by the power chip 210 may be directly output, or after the control module 222 selects one voltage storage region 2231 (the voltage storage region 2231 storing the gate code corresponding to the initial gate voltage) from the gate voltage storage module 223, the voltage storage region 2231 and the digital-to-analog conversion module 211 are turned on, and then the gate voltage corresponding to the gate code in the voltage storage region 2231 is output.
The gate voltage of the conventional driving circuit is directly output by the power chip 210, and the gate voltage directly output by the power chip 210 is not changed. Therefore, after the thin film transistors 120 on the display panel 100 driven by the conventional driving circuit are aged and the impedance is increased, the drain current (actual charging current) output by each thin film transistor 120 to the corresponding sub-pixel 110 is reduced under the same gate voltage, and thus the display of each sub-pixel becomes dark due to insufficient charging.
In this embodiment, the gate voltage storage module 223 and the digital-to-analog conversion module 211 including at least one voltage storage region 2231 are added, so that the gate voltage of the display device can be increased at least once after the display device is used for a period of time, and the phenomenon that the display device becomes dark due to aging of the thin film transistor 120 is effectively improved.
The addition of the gate voltage storage module 223 and the digital-to-analog conversion module 211 enables the power chip 210 to output a plurality of gate voltages without additionally providing an actual gate voltage output module. Of course, in other embodiments of the present application, an actual gate voltage output module may be added to the power chip 210. At this time, after the display device is used for a period of time, the control module 222 may control the power chip 210 to directly output the gate voltage with a larger voltage value through the additional gate voltage output module.
In one embodiment, the control module 222 reads the gate voltage code of the corresponding voltage storage area 2231 according to the working duration of the driving circuit 200, and then transmits the corresponding gate voltage code to the digital-to-analog conversion module 211, so that the control module 222 selectively turns on the corresponding voltage storage area 2231 and the digital-to-analog conversion module 211 according to the total working duration of the driving circuit 200. Then, the digital-to-analog conversion module 211 converts the corresponding gate voltage code into the corresponding gate voltage for output.
Specifically, in the present embodiment, the control module 222 may be located in the timing control chip 220. And the digital-to-analog conversion module 211 is located in the power chip 210. At this time, in order to transmit the gate voltage codes of the respective voltage storage areas 2231 to the digital-to-analog conversion module 211, the timing control chip 220 may be provided with the first communication module 224, and the power supply chip 210 may be provided with the second communication module 212. The gate voltage codes of the voltage storage areas 2231 are transmitted to the second communication module 212 through the first communication module 224, and then transmitted to the digital-to-analog conversion module 211 by the second communication module.
Alternatively, the control module 222 and the digital-to-analog conversion module 211 may be both located in the power chip 210, and at this time, the control module 222 may be directly electrically connected to the digital-to-analog conversion module 211 to transmit the gate voltage codes of the voltage storage areas 2231.
In this embodiment, the selection of each voltage storage area 2231 by the control module 222 is realized by reading a program, so that a desired function can be realized without adding other circuit designs.
Of course, in other embodiments of the present application, the selection of each voltage storage area 2231 by the control module 222 may also be implemented in other manners.
For example, in another embodiment, referring to fig. 4, the driving circuit 200 further includes a switching module 225. The switch module 225 includes the same number of switch cells 2251 as the voltage storage area 2231. The switch cells 2251 are provided in one-to-one correspondence with the voltage storage regions 2231. Each of the switch cells 2251 is electrically connected to a corresponding voltage storage area 2231, respectively.
The control module controls to close the corresponding switch unit 2231 according to the total operating time calculated by the timing module, and the corresponding switch unit 2251 conducts the corresponding voltage storage region 2231 and the digital-to-analog conversion module 211, so as to output the corresponding gate voltage.
In one embodiment, the timing module 221 includes a timing unit 2211 and a non-volatile memory 2212. The timing unit 2211 and the nonvolatile memory 2212 are electrically connected to the control module 222, and timing can be performed by the control module 222. The nonvolatile memory 2212 is used to store the timing of the timing module 221.
The initial timing value in the non-volatile memory storage 2212 may be set to zero. When the driving circuit 200 is turned on for the first time, the control block 222 reads the timing stored in the nonvolatile memory 2212 and controls the timing unit 2211 to continue the accumulated timing based on the read timing. When the driving circuit is turned off, the control module 222 stores the timing of the timing unit 2211 in the nonvolatile memory 2212. The nonvolatile memory 2212 does not lose stored data when the driving circuit 200 is turned off or when the driving circuit 200 is turned off suddenly or unexpectedly. Therefore, the current service time is convenient to be saved when a display device (such as a television) using the driving circuit 200 of the present application is turned off.
When the driving circuit 200 is turned on again, the driving circuit 200 repeats the above process, the control module 222 reads the timing stored in the nonvolatile memory 2212 again, and controls the timing unit 2211 to continue the accumulated timing based on the read timing. That is, when the display device (e.g., a television) using the driving circuit 200 of the present application is turned on again, the timing unit 2211 can continue to accumulate the timing based on the last power-on timing. When the driving circuit 200 is turned off again, the control module 222 stores the timing of the timing unit 2211 in the nonvolatile memory 2212 again. During the operation of the display device, the driving circuit 200 keeps the operation time according to the above process.
Since the display device (e.g., a television) of the user is not always in a watching state, the present embodiment performs timing when the display device is turned on, and does not perform timing when the display device is turned off, but stores the timing when the display device is turned on, so that the timing can be accumulated when the display device is turned on again. Therefore, the present embodiment can accurately and effectively time the operating time of the driving circuit 200, that is, accurately and effectively time the operating time of the display device, when the display device can be turned on or off at any time.
In one embodiment, the power supply chip 210 may be designed to also output a clocked supply voltage. The timing supply voltage may be a specially designed voltage for timing operations. Of course, it may also be a power supply voltage of a certain portion of the driving circuit (e.g., the timing control chip 220), so that the timing can be performed without modifying the conventional power supply chip 230, thereby improving system compatibility.
Meanwhile, in the present embodiment, the control module 222 is further configured to detect a timing power voltage, so as to effectively reflect whether the driving circuit 200 is turned on or off according to the detected voltage condition. When the control module 222 is located in the timing control chip 220, the timing power voltage is the power voltage of the timing control chip 220, which is also convenient for the control module 222 to detect.
Specifically, when the voltage detected by the control module 222 is equal to the timing power voltage, it indicates that the driving circuit 200 is normally turned on. At this time, the control module 222 reads the timing of the nonvolatile memory storage 2212, and controls the timing unit 2211 to continue the accumulation timing based on the read timing. When the voltage detected by the control module 222 is less than the timing power voltage, it indicates that the driving circuit 200 is being turned off. At this time, the control module 222 stores the time counted by the time counting unit 2211 in the nonvolatile memory 2212, and effectively saves the time count record.
In one embodiment, timing unit 2211 includes a sampling clock 2211a and a counter 2211 b. The sampling clock 2211a and the counter 2211b are electrically connected to the control module 222. The nonvolatile memory 2212 is used to store the count of the counter 2211 b. The initial count value in the non-volatile memory storage 2212 may be set to zero.
The sampling clock 2211a is used to provide the detection frequency to the control module 222. The control module 222 detects the timing power voltage according to the detection frequency.
When the voltage detected by the control module 222 is equal to the clocked power voltage, the control module 222 reads the count stored in the nonvolatile memory 2212 and controls the counter 2211b to continue accumulating the count on the basis of the read count. When the voltage detected by the control module 222 is less than the timing power voltage, the control module 222 stores the count in the counter 2211b in the non-volatile memory 2212.
The control module 222 of this embodiment detects the timing power voltage according to the detection frequency of the sampling clock 2211a, and when the voltage detected by the control module 222 is equal to the timing power voltage, the counter 2211b counts. Therefore, the total operating time of the driving circuit 200 can be obtained by multiplying the detection period of the sampling clock 2211a by the total count value of the counter 2211 b. Therefore, the total count value of the counter 2211b in this embodiment reflects the total operating time of the driving circuit 200.
At this time, the control module 222 controls the power chip 210 to output a corresponding gate voltage according to the total working duration, which is: the control module 222 controls the power chip 210 to output the corresponding gate voltage according to the total count value of the counter 2211 b.
In one embodiment, the driving circuit includes a power chip 210 and a timing control chip 220.
The timing control chip 220 includes a control module 222, a sampling clock 2211a, a counter 2211b, a non-volatile memory 2212, and at least one voltage storage area 2231. The voltage storage area 2231 is used to store a gate voltage code. The sampling clock 2211a, the counter 2211b, the nonvolatile memory 2212, and the voltage storage areas 2231 are all electrically connected to the control module 222.
The power supply chip 210 includes a digital-to-analog conversion module 211. The digital-to-analog conversion module 211 is used for converting the gate voltage code into the gate voltage and outputting the gate voltage. The power supply chip 210 is also used to output a power supply voltage of the timing control chip 220.
The sampling clock 2211a is used to provide the detection frequency to the control module 222. The control module 222 detects a power voltage of the timing control chip 220 according to the detection frequency.
When the voltage detected by the control module 222 is equal to the power voltage of the timing control chip 220, the control module 222 reads the count stored in the nonvolatile memory 2212 and controls the counter 2211b to continue accumulating the count based on the read count. When the voltage detected by the control module 222 is lower than the power voltage of the timing control chip 220, the control module 222 stores the count in the counter 2211b in the nonvolatile memory 2212.
The control module 222 reads the gate voltage code of the corresponding voltage storage area 2231 according to the total count value of the counter 2211b, and converts the corresponding gate voltage code into the corresponding gate voltage through the digital-to-analog conversion module 211 for output. The larger the total count value of the counter 2211b is, the larger the gate voltage output by the power supply chip 210 is.
In this embodiment, the control module 222 detects the power voltage of the timing control chip 220 according to the detection frequency of the sampling clock 2211 a. When the voltage detected by the control module 222 is equal to the power voltage of the timing control chip 220, the counter 2211b counts. Therefore, the total operating time of the driving circuit 200 can be obtained by multiplying the detection period of the sampling clock 2211a by the total count value of the counter 2211 b. Therefore, the total count value of the counter 2211b in this embodiment reflects the total operating time of the driving circuit 200.
Therefore, in the present embodiment, when the total operation time of the driving circuit 200 is gradually increased, the gate voltage output by the power chip 210 is also increased. Therefore, when the tft 120 driven by the driving circuit 200 of the present embodiment is aged after long-term use, the gate voltage can be increased to reduce the channel resistance of the conductive channel, so as to compensate for the decrease of the actual charging current caused by the increase of the impedance of the tft 120, thereby effectively preventing the luminance of the display device from being lowered after a long period of use.
The number of the voltage storage regions 2231 in this embodiment may be one, two, or more, and is not limited herein. Specifically, the number of the voltage storage regions 2231 may be three, for example. At this time, it may be set that: when the total count value of the counter 2211b is less than the first count standard, the driving chip 210 outputs an initial gate voltage to the display panel 100. When the total count value of the counter 2211b is greater than the first count standard and less than the second count standard, the control module 222 reads the gate voltage code of the first voltage storage area 2231 and converts the corresponding gate voltage code into the first gate voltage through the digital-to-analog conversion module 211 for outputting. When the total count value of the counter 2211b is greater than the second count standard and less than the third count standard, the control module 222 reads the gate voltage code of the second voltage storage area 2231 and converts the corresponding gate voltage code into a second gate voltage through the digital-to-analog conversion module 211 for outputting. When the total count value of the counter 2211b is greater than the third count standard, the control module 222 reads the gate voltage code of the third voltage storage area 2231 and converts the corresponding gate voltage code into the third gate voltage through the digital-to-analog conversion module 211 for output. The voltage values of the initial gate voltage, the first gate voltage, the second gate voltage, and the third gate voltage are sequentially increased.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A driver circuit, comprising:
the power supply chip is used for outputting grid voltage;
the timing module is used for calculating the total working time of the driving circuit;
the control module is electrically connected with the timing module;
the control module controls the power supply chip to output corresponding grid voltage according to the total working duration; the longer the total working time is, the larger the grid voltage output by the power supply chip is;
the driving circuit further comprises a grid voltage storage module, the grid voltage storage module comprises at least one voltage storage area which is electrically connected with the control module, and the voltage storage area is used for storing grid voltage codes;
the power supply chip comprises a digital-to-analog conversion module, and the digital-to-analog conversion module is used for converting the grid voltage code into grid voltage and outputting the grid voltage;
the control module selectively conducts the corresponding voltage storage area and the digital-to-analog conversion module according to the total working duration so as to output corresponding grid voltage;
the grid voltage storage module and the digital-to-analog conversion module are used for outputting a plurality of grid voltages.
2. The drive circuit according to claim 1,
the driving circuit further comprises a time sequence control chip, and the timing module, the control module and the grid voltage storage module are all located in the time sequence control chip.
3. The drive circuit according to claim 1,
and the control module is used for reading the grid voltage codes of the corresponding voltage storage area according to the total working duration and transmitting the corresponding grid voltage codes to the digital-to-analog conversion module.
4. The drive circuit according to claim 1,
the driving circuit further comprises a switch module, the switch module comprises switch units, the number of the switch units is the same as that of the voltage storage areas, and the switch units and the voltage storage areas are arranged in a one-to-one correspondence mode and are electrically connected to the corresponding voltage storage areas;
the control module controls to close the corresponding switch unit according to the total working time calculated by the timing module, and the corresponding switch unit conducts the corresponding voltage storage area and the digital-to-analog conversion module so as to output the corresponding grid voltage.
5. The drive circuit according to claim 1,
the timing module comprises a timing unit and a nonvolatile memory;
the timing unit and the nonvolatile memory are electrically connected to the control module, and the nonvolatile memory is used for storing the timing of the timing module;
when the driving circuit is started, the control module reads the timing stored in the nonvolatile memory and controls the timing unit to continue to accumulate the timing on the basis of the read timing, and when the driving circuit is closed, the control module stores the timing of the timing unit in the nonvolatile memory.
6. The drive circuit according to claim 5,
the power supply chip is also used for outputting timing power supply voltage;
the control module is also used for detecting the timing power supply voltage; when the voltage detected by the control module is equal to the timing power supply voltage, the control module reads the timing stored in the nonvolatile memory, controls the timing unit to continue to accumulate and time on the basis of the read timing, and when the voltage detected by the control module is smaller than the timing power supply voltage, the control module stores the timing of the timing unit in the nonvolatile memory.
7. The driving circuit of claim 6, further comprising a timing control chip, wherein the control module is located in the timing control chip, and the timing power voltage is a power voltage of the timing control chip.
8. The drive circuit according to claim 6,
the timing unit comprises a sampling clock and a counter, the sampling clock and the counter are electrically connected to the control module, and the nonvolatile memory is used for storing the count of the counter;
the sampling clock is used for providing a detection frequency for the control module, and the control module detects the timing power supply voltage according to the detection frequency;
when the voltage detected by the control module is equal to the timing power supply voltage, the control module reads the count stored in the nonvolatile memory and controls the counter to continue accumulating the count on the basis of the read count, and when the voltage detected by the control module is equal to the timing power supply voltage, the control module stores the count in the counter into the nonvolatile memory.
9. A driver circuit, comprising:
the timing sequence control chip comprises a control module, a sampling clock, a counter, a nonvolatile memory and a grid voltage storage module, wherein the grid voltage storage module comprises at least one voltage storage area, the voltage storage area is used for storing grid voltage codes, and the sampling clock, the counter, the nonvolatile memory and each voltage storage area are electrically connected with the control module;
the power supply chip comprises a digital-to-analog conversion module, the digital-to-analog conversion module is used for converting the grid voltage codes into grid voltages to be output, the grid voltage storage module and the digital-to-analog conversion module are used for outputting a plurality of grid voltages, and the power supply chip is also used for outputting the power supply voltage of the time sequence control chip;
the sampling clock is used for providing a detection frequency for the control module, and the control module detects the power supply voltage of the time sequence control chip according to the detection frequency;
when the voltage detected by the control module is equal to the power supply voltage of the time sequence control chip, the control module reads the count stored in the nonvolatile memory and controls the counter to continue accumulating the count on the basis of the read count, and when the voltage detected by the control module is smaller than the power supply voltage of the time sequence control chip, the control module stores the count in the counter into the nonvolatile memory;
the control module reads the grid voltage codes of the corresponding voltage storage area according to the total count value of the counter, and converts the corresponding grid voltage codes into corresponding grid voltage through the digital-to-analog conversion module for output; the larger the total count value is, the larger the gate voltage output by the power supply chip is.
10. A display device comprising a display panel and the driver circuit according to any one of claims 1 to 9, the driver circuit being configured to drive the display panel.
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