CN107578754B - Overcurrent protection system and overcurrent protection method of liquid crystal display panel - Google Patents
Overcurrent protection system and overcurrent protection method of liquid crystal display panel Download PDFInfo
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Abstract
The invention provides an overcurrent protection system and an overcurrent protection method of a liquid crystal display panel. The system comprises: the time sequence controller and the power management chip are electrically connected with the time sequence controller; the timing controller includes: the current monitoring module and the I2C host module are electrically connected with the current monitoring module; the power management chip includes: the output module, the I2C slave module and the analog-to-digital conversion module; the I2C master module is electrically connected with the I2C slave module, and the analog-to-digital conversion module is electrically connected with the I2C slave module and the output module; the I2C host module and the I2C slave module are matched to control the analog-to-digital conversion module to finish current acquisition and analog-to-digital conversion in a blank display stage of a frame of picture of the liquid crystal display panel, so that the accuracy of overcurrent detection of the power management chip is improved, the internal circuit of the liquid crystal display panel is effectively protected, the liquid crystal display panel is prevented from being burnt out by overcurrent, and the production loss of enterprises is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to an overcurrent protection system and an overcurrent protection method of a liquid crystal display panel.
Background
With the development of Display technology, flat panel Display devices such as Liquid Crystal Displays (LCDs) have advantages of high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and become the mainstream of Display devices.
Most of the existing liquid crystal display devices in the market are backlight liquid crystal displays (lcds), which include a liquid crystal display panel and a backlight module (backlight module). The liquid crystal display panel has the working principle that liquid crystal molecules are placed in two parallel glass substrates, a plurality of vertical and horizontal fine wires are arranged between the two glass substrates, and the liquid crystal molecules are controlled to change directions by electrifying or not, so that light rays of the backlight module are refracted out to generate pictures.
The driving system of the liquid crystal display panel mainly includes a Timing Controller (TCON), a gate DRIVER (GATEDRIVER), and a SOURCE DRIVER (SOURCE DRIVER). The timing controller is mainly responsible for sending timing signals for driving the liquid crystal display panel to the gate driver and the source driver to drive the liquid crystal display panel, the gate driver mainly functions to provide scanning signals for the scanning lines, and the source driver mainly functions to provide data signals for the data lines.
The power management chip is a very important chip in the electronic device, and the power management chip plays roles of conversion, distribution, detection and other power management of power in the electronic device system, and the liquid crystal display panel has also started to use a dedicated power management chip (PMIC) to provide voltages such as a high Voltage (VGH), a low Voltage (VGL), a common Voltage (VCOM) and the like for driving and displaying. Due to the factors such as long service time, processing defects or improper component attachment, the short circuit of VGH, VGL or VCOM and the like can cause overcurrent, so that the liquid crystal display panel is overheated to burn out, and the liquid crystal display panel can only be scrapped after being burnt out, thereby causing certain loss for liquid crystal display panel enterprises. In the market, a scheme for directly performing hardware over-current protection (OCP) detection on VGH, VGL and VCOM through PMIC has appeared, but after detecting an over-current to a circuit in a short time, the method usually enables the over-current protection within a time of microsecond (us) level, and has a disadvantage of easy misdetection.
Disclosure of Invention
The invention aims to provide an overcurrent protection system of a liquid crystal display panel, which can improve the accuracy of overcurrent detection of a power management chip, effectively protect an internal circuit of the liquid crystal display panel, avoid the liquid crystal display panel from being burnt by overcurrent and reduce the production loss of an enterprise.
The invention also aims to provide an overcurrent protection method of the liquid crystal display panel, which can improve the accuracy of overcurrent detection of the power management chip, effectively protect the internal circuit of the liquid crystal display panel, avoid the overcurrent burning of the liquid crystal display panel and reduce the production loss of enterprises.
In order to achieve the above object, the present invention provides an overcurrent protection system for a liquid crystal display panel, comprising: the power management chip is electrically connected with the time schedule controller;
the timing controller includes: the current monitoring module and the I2C host module are electrically connected with the current monitoring module; the power management chip includes: the I2C slave module is electrically connected with the output module; the I2C master module is electrically connected with the I2C slave module, and the analog-to-digital conversion module is electrically connected with the I2C slave module and the output module;
the I2C master module for sending a first command and a second command to the I2C slave module;
the output module is used for outputting a driving current to the liquid crystal display panel, and the driving current is an analog signal;
the I2C slave module is used for receiving a first instruction and a second instruction from the I2C master module and sending the first instruction and the second instruction to the analog-to-digital conversion module;
the analog-to-digital conversion module is used for acquiring the driving current output by the output module according to a first instruction, performing analog-to-digital conversion on the acquired driving current to generate a digital signal, and sending the digital signal to the current monitoring module according to a second instruction;
the current monitoring module is used for determining whether the driving current is overcurrent or not according to the received digital signal, and sending an instruction for starting overcurrent protection to the output module of the power management chip through the I2C host module and the I2C slave module when the driving current is overcurrent;
the time when the I2C master module sends the first instruction to the I2C slave module is a first time, the time when the I2C slave module receives the first instruction from the I2C master module and the time when the analog-to-digital conversion module starts to collect the driving current and perform analog-to-digital conversion are both second times, the time when the analog-to-digital conversion module finishes collecting the driving current and performing analog-to-digital conversion is a third time, and the time when the I2C master module sends the second instruction to the I2C slave module is a fourth time;
the first time is located in an effective display stage of a frame of picture of the liquid crystal display panel, the second time and the third time are both located in a blank display stage of the frame of picture where the first time is located, and the fourth time is located in an effective display stage of a next frame of picture of the frame of picture where the first time is located.
The timing controller further includes: the clock signal counting module is electrically connected with the I2C host module, and the clock signal output module is electrically connected with the clock signal counting module;
the clock signal output module is used for outputting clock signals, and the clock signal counting module is used for recording the pulse number of the output clock signals;
the I2C host module determines a first time according to the number of pulses recorded by the clock signal counting module, wherein the first time is the time when the number of pulses recorded by the clock signal counting module is equal to a preset target number.
In a blank display stage of a frame of picture of the liquid crystal display panel, the clock signal output by the clock signal output module is always at a low potential.
The clock signal counting module determines the pulse number of the output clock signal according to the rising edge number of the clock signal.
The overcurrent protection system is applied to the liquid crystal display panel with the picture refreshing frequency of 50Hz or 60 Hz.
The output module includes: a plurality of output channels that output different drive currents, respectively.
The current monitoring module compares the digital signal with a preset overcurrent threshold value to obtain a comparison result, and judges whether the driving current is overcurrent or not according to the comparison.
The invention also provides an overcurrent protection method of the liquid crystal display panel, which is applied to the overcurrent protection system of the liquid crystal display panel and comprises the following steps:
step S1, the output module outputs a driving current to the liquid crystal display panel, wherein the driving current is an analog signal;
step S2, the I2C master module sends a first instruction to the I2C slave module, and the I2C slave module receives the first instruction from the I2C master module and sends the first instruction to the analog-to-digital conversion module; wherein, the time when the I2C master module sends the first command to the I2C slave module is the first time, and the time when the I2C slave module receives the first command from the I2C master module is the second time;
step S3, the analog-to-digital conversion module collects the driving current output by the output module according to a first instruction, and performs analog-to-digital conversion on the collected driving current to generate a digital signal; the time for the analog-to-digital conversion module to start the acquisition and analog-to-digital conversion of the driving current is a second time, and the time for the analog-to-digital conversion module to finish the acquisition and analog-to-digital conversion of the driving current is a third time;
step S4, the I2C master module sends a second command to the I2C slave module, and the I2C slave module receives the second command from the I2C master module and sends the second command to the analog-to-digital conversion module; wherein, the time when the I2C master module sends the second command to the I2C slave module is the fourth time;
step S5, the analog-to-digital conversion module sends the digital signal to a current monitoring module according to a second instruction;
step S6, the current monitoring module determines whether the driving current is over-current according to the received digital signal, and sends an over-current protection starting instruction to the output module of the power management chip through the I2C host module and the I2C slave module when the driving current is over-current;
the first time is located in an effective display stage of a frame of picture of the liquid crystal display panel, the second time and the third time are both located in a blank display stage of the frame of picture where the first time is located, and the fourth time is located in an effective display stage of a next frame of picture of the frame of picture where the first time is located.
The invention has the beneficial effects that: the invention provides an overcurrent protection system of a liquid crystal display panel, which comprises: the power management chip is electrically connected with the time schedule controller; the timing controller includes: the current monitoring module and the I2C host module are electrically connected with the current monitoring module; the power management chip includes: the I2C slave module is electrically connected with the output module; the I2C master module is electrically connected with the I2C slave module, and the analog-to-digital conversion module is electrically connected with the I2C slave module and the output module; the I2C host module and the I2C slave module are matched to control the analog-to-digital conversion module to finish current acquisition and analog-to-digital conversion in a blank display stage of a frame of picture of the liquid crystal display panel, so that the current acquisition accuracy is prevented from being influenced by a signal output by the time schedule controller, the overcurrent detection accuracy of the power management chip is improved, an internal circuit of the liquid crystal display panel is effectively protected, the liquid crystal display panel is prevented from being burnt by overcurrent, and the production loss of enterprises is reduced. The invention also provides an overcurrent protection method of the liquid crystal display panel, which can improve the accuracy of overcurrent detection of the power management chip, effectively protect the internal circuit of the liquid crystal display panel, avoid the overcurrent burning of the liquid crystal display panel and reduce the production loss of enterprises.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of an over-current protection system of a liquid crystal display panel according to the present invention;
FIG. 2 is a flow chart of the over-current protection method of the LCD panel according to the present invention;
FIG. 3 is a timing diagram illustrating the operation of the over-current protection system of the LCD panel according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 1, the present invention provides an over-current protection system for a liquid crystal display panel, including: the system comprises a time schedule controller 1 and a power management chip 2 electrically connected with the time schedule controller 1;
the timing controller 1 includes: a current monitoring module 11, and an Inter-Integrated Circuit bus (I2C) host (Master) module 12 electrically connected to the current monitoring module 11; the power management chip 2 includes: an output module 21, a slave I2C (Salve) module 22 electrically connected to the output module 21, and an analog-to-digital conversion module 23; the I2C master module 12 is electrically connected to the I2C slave module 22, the analog-to-digital conversion module 23 is electrically connected to the I2C slave module 22 and the output module 21;
the I2C master module 12 for sending a first command and a second command to the I2C slave module 21; the output module 21 is configured to output a driving current to the liquid crystal display panel, where the driving current is an analog signal; the I2C slave module 22 is used for receiving the first instruction and the second instruction from the I2C master module 12 and sending the first instruction and the second instruction to the analog-to-digital conversion module 23; the analog-to-digital conversion module 23 is configured to acquire the driving current output by the output module 21 according to a first instruction, perform analog-to-digital conversion on the acquired driving current, generate a digital signal, and send the digital signal to the current monitoring module 11 via the I2C slave module 22 and the I2C host module 12 according to a second instruction; the current monitoring module 11 is configured to determine whether the driving current is overcurrent according to the received digital signal, and send an instruction for starting overcurrent protection to the output module 21 of the power management chip 2 from the slave module 22 via the I2C host module 12 and the I2C when the driving current is overcurrent.
It should be noted that, referring to fig. 3, in the driving process of the lcd, in order to ensure the correct display of the image, a frame of image is divided into an Active display stage (Active) and a Blank display stage (Blank), the data signal of the lcd panel is only written into the sub-pixel in the Active display stage (Active), and there is no input of the data signal in the Blank display stage, the control signal such as the clock signal output by the timing controller 1 is a pulse signal that changes periodically in the Active display stage, if the analog-to-digital conversion module 23 is started to collect the driving current in the Active display stage, the current peak value generated by the coupling of the clock signal and other signals is easily collected by mistake, and the clock signal and other signals output by the timing controller 1 are usually constantly low potential or constantly high potential in the Blank display stage, so that the driving current collected in the Blank display stage does not generate the current peak value caused by the signal coupling compared with the Active display stage, in view of the fact that the acquired data is more accurate, the analog-to-digital conversion module 23 is configured to collect the driving current output by the output module 21, perform analog-to-digital conversion on the collected driving current, and complete the process of generating the digital signal in the blank display stage of one frame of picture of the liquid crystal display panel.
Specifically, in order to ensure that the analog-to-digital conversion module 23 collects the driving current output by the output module 21, performs analog-to-digital conversion on the collected driving current, and completes the process of generating a digital signal in a blank display stage of a frame of a picture of the liquid crystal display panel, the present invention sets the time when the I2C host module 12 sends a first instruction to the I2C slave module 22 as a first time, sets the time when the I2C slave module 22 receives the first instruction from the I2C host module 12 and the time when the analog-to-digital conversion module 23 starts collecting the driving current and performing analog-to-digital conversion as second times, sets the time when the analog-to-digital conversion module 23 finishes collecting the driving current and performs analog-to-digital conversion as a third time, and sets the time when the I2C host module 12 sends a second instruction to the I2C slave module 22 as a fourth time.
Wherein, because the analog-to-digital conversion module 23 needs to receive the complete first command to start the acquisition and the analog-to-digital conversion of the driving current, and the I2C slave module 22 needs to receive the complete first command from the I2C master module 12 and also needs time, in order to ensure that the process of the analog-to-digital conversion module 23 for the acquisition and the analog-to-digital conversion can be completed in the blank display stage of a frame, before entering the blank display stage of a frame, the I2C master module 12 needs to start the transmission of the first command, so that the time when the I2C receives the first command from the slave module 22 is in the blank display stage of the frame, and thus the start and the completion time of the acquisition and the analog-to-digital conversion of the analog-to-digital conversion module 23 are both in the blank display stage of the same frame, that is, the first time is in the effective display stage of the frame of the liquid crystal display panel, and the second time and the third time are both in a blank display stage of a frame of picture where the first time is.
Specifically, the fourth time is located at an effective display stage of a next frame of the picture at the first time, and preferably, the fourth time is located at an initial time of the effective display stage of the next frame of the picture at the first time, that is, immediately starting to send the second instruction as soon as the effective display stage of the next frame of the picture is entered.
It is worth mentioning that the timing controller 1 further includes: a clock signal output module 14, the clock signal output module 14 being configured to output a clock signal, the clock signal being used to control the implementation of the progressive scanning of the gate driver on the liquid crystal display panel, and to control the time when the I2C master module 12 starts sending the first instruction to the I2C slave module 22, the timing controller 1 further includes: the clock signal counting module 13 is electrically connected to the I2C master module 12 and the clock signal output module 14, the clock signal counting module 13 is configured to record a pulse number of an output clock signal, further, the clock signal counting module 13 determines and records the pulse number of the clock signal according to a rising edge number of the clock signal, and the I2C master module 12 determines a first time according to the pulse number recorded by the clock signal counting module 13, where the first time is a time when the pulse number recorded by the clock signal counting module 13 is equal to a preset target number, that is, when the clock signal counting module 13 counts a target number of pulses, the I2C master module 12 starts sending a first command to the I2C slave module 22.
Preferably, the clock signal output by the clock signal output module 14 is always at a low potential in a blank display stage of one frame of the lcd panel, so as to prevent a current peak caused by signal coupling in the blank display stage.
Preferably, the overcurrent protection system is applied to a liquid crystal display panel with a picture refreshing frequency of 50Hz or 60Hz, and the time that can be remedied after the liquid crystal display panel is subjected to overcurrent is often more than 200ms, so that in the liquid crystal display panel with the picture refreshing frequency of 50Hz or 60Hz, the overcurrent protection system can detect the time of more than 3 to 4 frames, and has enough time for the overcurrent protection system to perform overcurrent detection and judgment.
Specifically, the output module 21 includes: the liquid crystal display device comprises a plurality of output channels, wherein the output channels respectively output different driving currents, furthermore, the output channels respectively provide different voltage signals such as VGH, VGL, Vcom and the like for the liquid crystal display panel, and the driving currents are currents generated in the output channels when the output channels provide corresponding voltage signals.
Further, the current monitoring module 11 obtains a comparison result by comparing the digital signal with a preset overcurrent threshold, and determines whether the driving current is overcurrent according to the comparison result, wherein when the comparison result is that the digital signal of the current monitoring module 11 is greater than or equal to the overcurrent threshold, it is determined that the driving current is overcurrent, and when the comparison result is that the digital signal of the current monitoring module 11 is less than the overcurrent threshold, it is determined that the driving current is normal current.
Preferably, the output module 21 stops outputting the overcurrent protection command when receiving the overcurrent protection command, so as to perform overcurrent protection and avoid the overcurrent burning of the liquid crystal display panel.
Referring to fig. 2, the present invention further provides an overcurrent protection method for a liquid crystal display panel, which is applied to the overcurrent protection system for a liquid crystal display panel, and the method includes the following steps:
step S1, the output module 21 outputs a driving current to the liquid crystal display panel, where the driving current is an analog signal;
step S2, the I2C master module 12 sends a first command to the I2C slave module 22, and the I2C slave module 22 receives the first command from the I2C master module 12 and sends the first command to the analog-to-digital conversion module 23; wherein, the time when the I2C master module 12 sends the first command to the I2C slave module 22 is the first time, and the time when the I2C slave module 22 receives the first command from the I2C master module 12 is the second time;
step S3, the analog-to-digital conversion module 23 acquires the driving current output by the output module 21 according to the first instruction, and performs analog-to-digital conversion on the acquired driving current to generate a digital signal; the time when the analog-to-digital conversion module 23 starts to collect the driving current and perform analog-to-digital conversion is a second time, and the time when the analog-to-digital conversion module 23 finishes collecting the driving current and performing analog-to-digital conversion is a third time;
step S4, the I2C master module 12 sends a second command to the I2C slave module 22, and the I2C slave module 22 receives the second command from the I2C master module 12 and sends the second command to the analog-to-digital conversion module 23; wherein the time when the I2C master module 12 sends the second command to the I2C slave module 22 is the fourth time;
step S5, the analog-to-digital conversion module 23 sends the digital signal to the current monitoring module 11 according to a second instruction;
step S6, the current monitoring module 11 determines whether the driving current is over-current according to the received digital signal, and sends an instruction for starting over-current protection to the output module 21 of the power management chip 2 from the slave module 22 via the I2C host module 12 and the I2C when the driving current is over-current;
the first time is located in an effective display stage of a frame of picture of the liquid crystal display panel, the second time and the third time are both located in a blank display stage of the frame of picture where the first time is located, and the fourth time is located in an effective display stage of a next frame of picture of the frame of picture where the first time is located.
In summary, the present invention provides an over-current protection system for a liquid crystal display panel, including: the power management chip is electrically connected with the time schedule controller; the timing controller includes: the current monitoring module and the I2C host module are electrically connected with the current monitoring module; the power management chip includes: the output module, the I2C slave module and the analog-to-digital conversion module; the I2C master module is electrically connected with the I2C slave module, and the analog-to-digital conversion module is electrically connected with the I2C slave module and the output module; the I2C host module and the I2C slave module are matched to control the analog-to-digital conversion module to finish current acquisition and analog-to-digital conversion in a blank display stage of a frame of picture of the liquid crystal display panel, so that the current acquisition accuracy is prevented from being influenced by a signal output by the time schedule controller, the overcurrent detection accuracy of the power management chip is improved, an internal circuit of the liquid crystal display panel is effectively protected, the liquid crystal display panel is prevented from being burnt by overcurrent, and the production loss of enterprises is reduced. The invention also provides an overcurrent protection method of the liquid crystal display panel, which can improve the accuracy of overcurrent detection of the power management chip, effectively protect the internal circuit of the liquid crystal display panel, avoid the overcurrent burning of the liquid crystal display panel and reduce the production loss of enterprises.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (8)
1. An overcurrent protection system for a liquid crystal display panel, comprising: the power supply management system comprises a time sequence controller (1) and a power supply management chip (2) electrically connected with the time sequence controller (1);
the timing controller (1) includes: the current monitoring device comprises a current monitoring module (11) and an I2C host module (12) electrically connected with the current monitoring module (11); the power management chip (2) comprises: the device comprises an output module (21), an I2C slave module (22) and an analog-digital conversion module (23), wherein the I2C slave module is electrically connected with the output module (21); the I2C master module (12) is electrically connected with the I2C slave module (22), the analog-to-digital conversion module (23) is electrically connected with the I2C slave module (22) and the output module (21);
the I2C master module (12) to send first and second commands to the I2C slave module (22);
the I2C slave module (22) is used for receiving a first instruction and a second instruction from the I2C master module (12) and sending the first instruction and the second instruction to the analog-to-digital conversion module (23);
the output module (21) is used for outputting a driving current to the liquid crystal display panel, and the driving current is an analog signal;
the analog-to-digital conversion module (23) is used for acquiring the driving current output by the output module (21) according to a first instruction, performing analog-to-digital conversion on the acquired driving current to generate a digital signal, and sending the digital signal to the current monitoring module (11) according to a second instruction;
the current monitoring module (11) is used for determining whether the driving current is overcurrent or not according to the received digital signal, and sending an instruction for starting overcurrent protection to the output module (21) of the power management chip (2) from the slave module (22) through the I2C host module (12) and the I2C when the driving current is overcurrent;
the time when the I2C master module (12) sends a first instruction to the I2C slave module (22) is a first time, the time when the I2C slave module (22) receives the first instruction from the I2C master module (12) and the time when the analog-to-digital conversion module (23) starts to collect and convert the driving current are second times, the time when the analog-to-digital conversion module (23) finishes collecting and converting the driving current and converting the analog-to-digital is a third time, and the time when the I2C master module (12) sends a second instruction to the I2C slave module (22) is a fourth time;
the first time is located in an effective display stage of a frame of picture of the liquid crystal display panel, the second time and the third time are both located in a blank display stage of the frame of picture where the first time is located, and the fourth time is located in an effective display stage of a next frame of picture of the frame of picture where the first time is located.
2. The overcurrent protection system of a liquid crystal display panel according to claim 1, wherein the timing controller (1) further comprises: a clock signal counting module (13) electrically connected with the I2C host module (12), and a clock signal output module (14) electrically connected with the clock signal counting module (13);
the clock signal output module (14) is used for outputting clock signals, and the clock signal counting module (13) is used for recording the pulse number of the output clock signals;
the I2C host module (12) determines a first time according to the pulse number recorded by the clock signal counting module (13), wherein the first time is the time when the pulse number recorded by the clock signal counting module (13) is equal to a preset target number.
3. The over-current protection system of the liquid crystal display panel according to claim 2, wherein the clock signal output by the clock signal output module (14) is always at a low potential during the blank display period of one frame of the liquid crystal display panel.
4. The overcurrent protection system for liquid crystal display panels according to claim 2, wherein the clock signal counting block (13) determines the number of pulses of the output clock signal in accordance with the number of rising edges of the clock signal.
5. The overcurrent protection system for lcd panel as claimed in claim 1, wherein the overcurrent protection system for lcd panel is applied to lcd panel with a screen refresh frequency of 50Hz or 60 Hz.
6. The overcurrent protection system for a liquid crystal display panel according to claim 1, wherein the output module (21) comprises: a plurality of output channels that output different drive currents, respectively.
7. The over-current protection system of the liquid crystal display panel according to claim 1, wherein the current monitoring module (11) obtains a comparison result by comparing the digital signal with a preset over-current threshold, and determines whether the driving current is over-current according to the comparison.
8. An overcurrent protection method of a liquid crystal display panel, which is applied to the overcurrent protection system of the liquid crystal display panel according to any one of claims 1 to 7, is characterized by comprising the following steps:
step S1, the output module (21) outputs a driving current to the liquid crystal display panel, wherein the driving current is an analog signal;
step S2, the I2C master module (12) sends a first instruction to the I2C slave module (22), and the I2C slave module (22) receives the first instruction from the I2C master module (12) and sends the first instruction to the analog-to-digital conversion module (23); wherein the time when the I2C master module (12) sends the first command to the I2C slave module (22) is a first time, and the time when the I2C slave module (22) receives the first command from the I2C master module (12) is a second time;
step S3, the analog-to-digital conversion module (23) collects the driving current output by the output module (21) according to a first instruction, and performs analog-to-digital conversion on the collected driving current to generate a digital signal; the time for the analog-to-digital conversion module (23) to start the acquisition of the driving current and the analog-to-digital conversion is a second time, and the time for the analog-to-digital conversion module (23) to finish the acquisition of the driving current and the analog-to-digital conversion is a third time;
step S4, the I2C master module (12) sends a second instruction to the I2C slave module (22), and the I2C slave module (22) receives the second instruction from the I2C master module (12) and sends the second instruction to the analog-to-digital conversion module (23); wherein the time that the I2C master module (12) sends the second command to the I2C slave module (22) is a fourth time;
step S5, the analog-to-digital conversion module (23) sends the digital signal to the current monitoring module (11) according to a second instruction;
step S6, the current monitoring module (11) determines whether the driving current is overcurrent according to the received digital signal, and sends an instruction for starting overcurrent protection to an output module (21) of the power management chip (2) from a slave module (22) via an I2C host module (12) and an I2C when the driving current is overcurrent;
the first time is located in an effective display stage of a frame of picture of the liquid crystal display panel, the second time and the third time are both located in a blank display stage of the frame of picture where the first time is located, and the fourth time is located in an effective display stage of a next frame of picture of the frame of picture where the first time is located.
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| CN108550350B (en) * | 2018-04-18 | 2020-09-01 | 深圳市华星光电技术有限公司 | Overcurrent protection system and overcurrent protection method of liquid crystal display panel |
| CN108922489B (en) * | 2018-08-31 | 2020-09-11 | 重庆惠科金渝光电科技有限公司 | Drive circuit and correction method of internal overcurrent set value thereof |
| CN109859671B (en) * | 2019-04-01 | 2022-04-05 | 深圳市华星光电半导体显示技术有限公司 | Clock signal overcurrent protection method and array substrate row driving circuit |
| CN110060644B (en) * | 2019-04-10 | 2021-01-01 | 深圳市华星光电技术有限公司 | Liquid crystal display device and overcurrent protection method thereof |
| CN109920388B (en) * | 2019-04-11 | 2021-01-15 | 深圳市华星光电技术有限公司 | Display panel driving system |
| CN110890052B (en) * | 2019-11-29 | 2021-02-02 | Tcl华星光电技术有限公司 | Driving circuit, driving method and display device |
| CN114333721A (en) * | 2021-12-16 | 2022-04-12 | 苏州华星光电技术有限公司 | Thin film transistor and display device |
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| CN1820295A (en) * | 2003-05-07 | 2006-08-16 | 东芝松下显示技术有限公司 | El display and its driving method |
| KR101127865B1 (en) * | 2005-06-27 | 2012-03-21 | 엘지디스플레이 주식회사 | LCD with current protection circuit |
| CN101510406B (en) * | 2009-03-17 | 2011-02-09 | 上海广电光电子有限公司 | Drive method for main voltage of liquid crystal display |
| JP2012060744A (en) * | 2010-09-07 | 2012-03-22 | Rohm Co Ltd | Drive circuit of light emitting element, light emitting device using the same, and electronic apparatus |
| KR101350592B1 (en) * | 2011-12-12 | 2014-01-16 | 엘지디스플레이 주식회사 | Organic light-emitting display device |
| US8970577B2 (en) * | 2013-03-13 | 2015-03-03 | Synaptics Incorporated | Reducing display artifacts after non-display update periods |
| CN106707590A (en) * | 2017-02-27 | 2017-05-24 | 深圳市华星光电技术有限公司 | Display panel over-temperature protection system and display panel over-temperature protection method |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL Huaxing Photoelectric Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |