CN108550350B - 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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention provides an overcurrent protection system and an overcurrent protection method of a liquid crystal display panel. The overcurrent protection system of the liquid crystal display panel comprises a time schedule controller and a power supply management chip, wherein the time schedule controller comprises an I2C host module, an overcurrent detection module and a time schedule control module, the power supply management chip comprises an I2C slave module, a plurality of output channels, an analog-to-digital conversion module and a clock signal counting module, the I2C host module is used for sending an output channel selection instruction, and a clock signal counting module is used for sending an acquisition instruction according to the initial signal and a plurality of clock signals output by the time sequence control module, after the analog-to-digital conversion module receives the acquisition instruction, the driving current output by the corresponding output channel is collected according to the output channel selection instruction to obtain a digital signal, and the overcurrent detection module determines whether the driving current is overcurrent or not through the digital signal, so that the accuracy of overcurrent detection can be effectively improved, and the internal circuit of the liquid crystal display panel is protected.
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.
Power Management chips (PMICs) are very important chips in electronic devices, and the Power Management chips are responsible for Power conversion, distribution, detection and other Power Management in the electronic devices, and currently, the liquid crystal display panel also starts to use a dedicated Power Management chip to provide voltages such as high Voltage (VGH), low Voltage (VGL), 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 very short time, the method usually starts 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, 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 enterprises.
Another objective of the present invention is to provide an over-current protection method for a liquid crystal display panel, which can improve accuracy of over-current detection, effectively protect internal circuits of the liquid crystal display panel, avoid over-current burning of the liquid crystal display panel, and reduce production loss of enterprises.
In order to achieve the above object, the present invention first provides an over-current protection system for a liquid crystal display panel, including a timing controller and a power management chip electrically connected to the timing controller;
the time sequence controller comprises an I2C host module, an overcurrent detection module and a time sequence control module, wherein the overcurrent detection module is electrically connected with the I2C host module; the power management chip comprises an I2C slave module electrically connected with an I2C host module of the time schedule controller, a plurality of output channels electrically connected with the I2C slave module, an analog-to-digital conversion module electrically connected with the I2C slave module and the output channels, and a clock signal counting module electrically connected with the analog-to-digital conversion module and a time schedule control module in the time schedule controller;
the output channels are used for outputting driving current to the liquid crystal display panel, and the driving current is an analog signal;
the time sequence control module is used for outputting a starting signal and a plurality of clock signals;
the I2C master module is used for sending an output channel selection instruction and a reading instruction to the I2C slave module;
the I2C slave module is used for receiving an output channel selection instruction and a reading instruction from the I2C host module and sending the output channel selection instruction and the reading instruction to the analog-to-digital conversion module;
the clock signal counting module is used for sending an acquisition instruction to the analog-to-digital conversion module according to the initial signal output by the time sequence control module and the plurality of clock signals;
the analog-to-digital conversion module is used for acquiring the driving current output by the corresponding output channel according to the output channel selection instruction after receiving the acquisition instruction, performing analog-to-digital conversion on the acquired driving current to generate and store a digital signal, and sending the stored digital signal to the over-current detection module after receiving the reading instruction;
the overcurrent detection 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 corresponding output channel when the driving current is overcurrent.
The clock signal counting module sends an acquisition instruction to the analog-to-digital conversion module in a blank display stage of a frame of picture of the liquid crystal display panel according to the initial signal and the plurality of clock signals output by the time sequence control module.
The I2C master module sends an output channel selection command to the I2C slave module in the effective display stage of one frame of picture of the liquid crystal display panel.
The analog-to-digital conversion module collects the driving current output by the corresponding output channel and completes the process of analog-to-digital conversion of the collected driving current in the blank display stage of one frame of picture of the liquid crystal display panel.
The clock signal counting module comprises a level conversion unit and a clock signal counting unit electrically connected with the level conversion unit; the level conversion unit is electrically connected with a time sequence control module in the time sequence controller; the clock signal counting unit is electrically connected with the analog-to-digital conversion module;
the clock signal counting unit comprises a processing unit, a trigger channel register electrically connected with the processing unit, a counting register electrically connected with the processing unit and a trigger threshold register electrically connected with the processing unit; the processing unit is electrically connected with the level conversion unit and the analog-to-digital conversion module;
the level conversion unit is used for receiving and converting the initial signal and the plurality of clock signals output by the time sequence control module and transmitting the converted initial signal and the plurality of clock signals to the processing unit;
the trigger channel register is used for storing a reference clock signal code, and the reference clock signal code corresponds to one of a plurality of clock signals output by the time sequence control unit;
the trigger threshold register is used for storing a trigger threshold;
the processing unit is used for receiving the converted initial signal and a plurality of clock signals, resetting the value in the counting register to be 0 at the rising edge moment of the initial signal, increasing the value in the counting register by 1 when each rising edge of the clock signal corresponding to the reference clock signal code arrives when the value in the counting register is smaller than the trigger threshold stored in the trigger threshold register, and sending an acquisition instruction to the analog-to-digital conversion module and resetting the value in the counting register to be 0 when the value in the counting register is equal to the trigger threshold stored in the trigger threshold register;
the clock signals send out a plurality of pulses corresponding to one frame of picture of the liquid crystal display panel, the number of the pulses is equal to the storage trigger threshold, and the rising edge of the last pulse of the plurality of pulses corresponding to one frame of picture of the clock signal corresponding to the reference clock signal code is positioned in the blank display stage of the one frame of display picture.
The trigger channel register, the counting register and the trigger threshold register are all electrically connected with the I2C slave module;
the I2C host module is also used for sending an initialization instruction;
the I2C slave module is also used for receiving an initialization instruction from the I2C master module and sending the initialization instruction to the trigger channel register, the counting register and the trigger threshold register;
and the trigger channel register, the counting register and the trigger threshold register are initialized according to the initialization instruction after receiving the initialization instruction.
The clock signal counting unit also comprises an OCP enabling control unit electrically connected with the processing unit;
the OCP enabling control unit is accessed to an enabling signal, and when the enabling signal accessed by the OCP enabling control unit is in a high level state, the processing unit sends a collecting instruction to the analog-to-digital conversion module when the value in the counting register is equal to the trigger threshold stored in the trigger threshold register; the processing unit does not send out a collection instruction in the state that an enabling signal accessed by the OCP enabling control unit is in a low level;
the OCP enable control unit is also electrically connected with the I2C slave module, and the I2C slave module further sends an initialization instruction to the OCP enable control unit after receiving the initialization instruction; and the OCP enabling control unit initializes according to the initialization instruction after receiving the initialization instruction.
The analog-to-digital conversion module is provided with a digital signal register, and the analog-to-digital conversion module stores the digital signal by using the digital signal register.
The overcurrent detection 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 result.
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 channels output driving current to the liquid crystal display panel, the driving current is an analog signal, and the time sequence control module outputs a starting signal and a plurality of clock signals;
step S2, the I2C master module sends an output channel selection instruction to the I2C slave module, and the I2C slave module receives the output channel selection instruction from the I2C master module and sends the output channel selection instruction to the analog-to-digital conversion module;
step S3, the clock signal counting module sends an acquisition instruction to the analog-to-digital conversion module according to the initial signal and the plurality of clock signals output by the time sequence control module;
step S4, after receiving the acquisition instruction, the analog-to-digital conversion module acquires the driving current output by the corresponding output channel according to the output channel selection instruction, and performs analog-to-digital conversion on the acquired driving current to generate and store a digital signal;
step S5, the I2C master module sends a read command to the I2C slave module, and the I2C slave module receives the read command from the I2C master module and sends the read command to the analog-to-digital conversion module;
step S6, the analog-to-digital conversion module reads the stored digital signal according to the reading instruction and sends the digital signal to the over-current detection module;
step S7, the over-current detection module determines whether the driving current is over-current according to the received digital signal, and sends an instruction to start over-current protection to the corresponding output channel when the driving current is over-current.
The invention has the beneficial effects that: the invention provides an overcurrent protection system of a liquid crystal display panel, which comprises a time schedule controller and a power supply management chip, wherein the time schedule controller comprises an I2C host module, an overcurrent detection module and a time schedule control module, the power supply management chip comprises an I2C slave module, a plurality of output channels, an analog-to-digital conversion module and a clock signal counting module, the I2C host module is used for sending an output channel selection instruction, and a clock signal counting module is used for sending an acquisition instruction according to the initial signal and a plurality of clock signals output by the time sequence control module, after the analog-to-digital conversion module receives the acquisition instruction, the driving current output by the corresponding output channel is collected according to the output channel selection instruction to obtain a digital signal, and the overcurrent detection module determines whether the driving current is overcurrent or not through the digital signal, so that the accuracy of overcurrent detection can be effectively improved, and the internal circuit of the liquid crystal display panel is protected. The overcurrent protection method of the liquid crystal display panel can improve the accuracy of overcurrent detection, effectively protect the 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 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 schematic diagram illustrating a connection relationship between a clock signal counting module, a timing control module, an analog-to-digital conversion module, and an I2C slave module in the over-current protection system of an LCD panel according to the present invention;
FIG. 3 is a schematic structural diagram of an analog-to-digital conversion module of the over-current protection system of the LCD panel according to the present invention;
FIG. 4 is a flow chart of the over-current protection method of the LCD panel according to the present invention;
FIG. 5 is a timing diagram illustrating an over-current protection method for a liquid crystal display 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 overcurrent protection system for a liquid crystal display panel, which includes a timing controller 1 and a power management chip 2 electrically connected to the timing controller 1.
The timing controller 1 includes an integrated circuit bus (I2C) host (Master) module 11, an over-current detection module 12 electrically connected to the I2C host module 11, and a timing control module 13. The power management chip 2 includes an I2C slave (Salve) module 21 electrically connected to the I2C host module 11 of the timing controller 1, a plurality of output channels 22 electrically connected to the I2C slave module 21, an analog-to-digital conversion module 23 electrically connected to both the I2C slave module 21 and the plurality of output channels 22, and a clock signal counting module 24 electrically connected to both the analog-to-digital conversion module 23 and the timing control module 13 in the timing controller 1.
The output channels 22 are used for outputting a driving current to the liquid crystal display panel, and the driving current is an analog signal. The timing control module 13 is configured to output a start signal and a plurality of clock signals. The I2C master module 11 is used to send output channel select commands and read commands to the I2C slave module 21. The I2C slave module 21 is used for receiving the output channel selection command and the read command from the I2C master module 11 and sending the output channel selection command and the read command to the analog-to-digital conversion module 23. The clock signal counting module 24 is configured to send an acquisition instruction to the analog-to-digital conversion module 23 according to the start signal and the plurality of clock signals output by the timing control module 13. The analog-to-digital conversion module 23 is configured to, after receiving the acquisition instruction, acquire the driving current output by the corresponding output channel 22 according to the output channel selection instruction, perform analog-to-digital conversion on the acquired driving current, generate and store a digital signal, and after receiving the reading instruction, send the stored digital signal to the over-current detection module 12. The over-current detection module 12 is configured to determine whether the driving current is over-current according to the received digital signal, and send an instruction to start over-current protection to the corresponding output channel 22 when the driving current is over-current.
Specifically, the clock signal counting module 24 sends an acquisition instruction to the analog-to-digital conversion module 23 in a blank display stage of a frame of picture of the liquid crystal display panel according to the start signal and the plurality of clock signals output by the timing control module 13.
Preferably, the I2C master module 11 sends an output channel selection command to the I2C slave module 21 during the active display phase of one frame of screen of the lcd panel.
Preferably, the analog-to-digital conversion module 23 collects the driving current output by the corresponding output channel 22 and performs analog-to-digital conversion on the collected driving current in a blank display stage of a frame of a picture of the liquid crystal display panel.
It should be noted that, please refer to fig. 5, in the driving process of the lcd panel, in order to ensure the correct display of the image, a frame of the image is divided into an Active display phase (Active) and a Blank display phase (Blank), the data signal of the lcd panel is only written into the sub-pixel in the Active display phase (Active), and there is no input of the data signal in the Blank display phase, 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 phase, if the analog-to-digital conversion module 23 is started in the Active display phase to collect the driving current, the current peak value generated by the coupling of the clock signal and other signals is easily collected by mistake, and the current peak value generated by the signal coupling does not occur in the Blank display phase compared with the Active display phase, and the obtained data is more accurate, in view of this, the analog-to-digital conversion module 23 is arranged to collect the driving current output by the output channel 22, and perform analog-to-digital conversion on the collected driving current to generate a digital signal, wherein the process of generating the digital signal is completed in a blank display stage of a frame of picture of the liquid crystal display panel.
Specifically, referring to fig. 2, the clock signal counting module 24 includes a level converting unit 241 and a clock signal counting unit 242 electrically connected to the level converting unit 241. The level shifter 241 is electrically connected to the timing control module 13 of the timing controller 1. The clock signal counting unit 242 is electrically connected to the analog-to-digital conversion module 23.
The clock signal counting unit 242 includes a processing unit 2421, a trigger channel register 2422 electrically connected to the processing unit 2421, a count register 2423 electrically connected to the processing unit 2421, and a trigger threshold register 2424 electrically connected to the processing unit 2421. The processing unit 2421 is electrically connected to the level converting unit 241 and the analog-to-digital converting module 23.
The level conversion unit 241 is configured to receive the start signal and the plurality of clock signals output by the timing control module 13, perform conversion, and transmit the converted start signal and the plurality of clock signals to the processing unit 2421.
The trigger channel register 2422 is used to store a reference clock signal code corresponding to one of the plurality of clock signals output from the timing control unit 13. For example, the plurality of clock signals may be a first clock signal CK1, a second clock signal CK2, a third clock signal CK3, a fourth clock signal CK4, a fifth clock signal CK5 and a sixth clock signal CK6, the first clock signal CK1, the second clock signal CK2, the third clock signal CK3, the fourth clock signal CK4, the fifth clock signal CK5 and the sixth clock signal CK6 all have a code of 0, 1, 2, 3, 4 and 5, respectively, the reference clock signal code stored in the trigger channel register 2422 is 1, and the reference clock signal code corresponds to the second clock signal CK 2.
The trigger threshold register 2424 is used to store a trigger threshold.
The processing unit 2421 is configured to receive the converted start signal and multiple clock signals, reset the value in the count register 2423 to 0 at the time of the rising edge of the start signal, increase the value in the count register 2423 by 1 when each rising edge of the clock signal corresponding to the reference clock signal code arrives when the value in the count register 2423 is smaller than the trigger threshold stored in the trigger threshold register 2424, and send a collection instruction to the analog-to-digital conversion module 23 and reset the value in the count register 2423 to 0 when the value in the count register 2423 is equal to the trigger threshold stored in the trigger threshold register 2424.
The clock signals send out a plurality of pulses corresponding to one frame of picture of the liquid crystal display panel, the number of the pulses is equal to the storage trigger threshold, and the rising edge of the last pulse of the plurality of pulses corresponding to one frame of picture of the clock signal corresponding to the reference clock signal code is positioned in the blank display stage of the one frame of display picture.
Further, the clock signal counting module 24 is electrically connected to the I2C slave module 21, specifically, the trigger channel register 2422, the count register 2423 and the trigger threshold register 2424 are all electrically connected to the I2C slave module 21.
The I2C host module 11 is also used to send initialization instructions. The I2C slave module 21 is also used to receive initialization instructions from the I2C master module 11 and send them to the trigger channel register 2422, the count register 2423, and the trigger threshold register 2424. The trigger channel register 2422, the count register 2423 and the trigger threshold register 2424 are initialized according to the initialization instruction after receiving the initialization instruction.
Specifically, the clock signal counting unit 242 further includes an OCP enable control unit 2425 electrically connected to the processing unit 2421.
The OCP enable control unit 2425 accesses the enable signal, and when the enable signal accessed by the OCP enable control unit 2425 is at a high level, the processing unit 2421 sends a collection instruction to the analog-to-digital conversion module 23 when the value in the count register 2423 is equal to the trigger threshold stored in the trigger threshold register 2424. In a state where the enable signal accessed by the OCP enable control unit 2425 is at a low level, the processing unit 2421 does not issue a collection instruction.
The OCP enable control unit 2425 is further electrically connected to the I2C slave module 21, and the I2C slave module 21 further sends an initialization command to the OCP enable control unit 2425 after receiving the initialization command. The OCP enable control unit 2425 initializes according to an initialization instruction after receiving the initialization instruction.
Specifically, referring to fig. 3, the analog-to-digital conversion module 23 has a digital signal register 231, and the analog-to-digital conversion module 23 stores the digital signal by using the digital signal register 231.
Specifically, the over-current detection module 12 compares the digital signal with a preset over-current threshold to obtain a comparison result, and determines whether the driving current is over-current according to the comparison result.
Referring to fig. 1 and fig. 2 in combination with fig. 5, the working process of the over-current protection system of the liquid crystal display panel of the present invention is as follows:
first, the output channels 22 output driving currents to the lcd panel, the driving currents are analog signals, and at the same time, the timing control module 13 outputs a start signal and a plurality of clock signals, for example, in fig. 5, the plurality of clock signals include a first clock signal CK1, a second clock signal CK2, a third clock signal CK3, a fourth clock signal CK4, a fifth clock signal CK5, and a sixth clock signal CK6, each clock signal corresponds to one frame to generate 361 pulses, a trigger threshold stored in a trigger threshold register 2424 of the clock signal counting module 24 is 361, a reference clock signal stored in a trigger channel register 2422 is encoded as 1 and corresponds to the second clock signal CK2, the level conversion unit 241 receives and processes the start signal and the plurality of clock signals and then transmits the processed signals to the processing unit 2421, the processing unit 2421 receives the converted start signal and the plurality of clock signals, the value in the count register 2423 is reset to 0 at the time of the rising edge of the start signal, and the value in the count register 2423 is increased by 1 every time the rising edge of the clock signal corresponding to the reference clock signal code, i.e., the second clock signal CK2, arrives when the value in the count register 2423 is smaller than the trigger threshold stored in the trigger threshold register 2424, i.e., is smaller than 361. Then, in the active display phase of one frame, the I2C master module 11 sends an output channel selection command to the I2C slave module 21, and the I2C slave module receives the channel selection command and sends the channel selection command to the analog-to-digital conversion module 23. Subsequently, in a blank display stage of a frame of picture, the second clock signal CK2 arrives corresponding to a rising edge of the last pulse of the frame of picture, the value in the count register 2423 is 361 equal to the trigger threshold stored in the trigger threshold register 2424, the processing unit 2421 sends a collection instruction to the analog-to-digital conversion module 23 at this time and resets the value in the count register 2423 to 0, the analog-to-digital conversion module 23 receives the collection instruction, collects the driving current output by the corresponding output channel 22 according to the output channel selection instruction, and performs analog-to-digital conversion on the collected driving current to generate and store a digital signal. Then, the I2C master module 11 sends a read instruction to the I2C slave module 21, the I2C slave module 21 receives the read instruction from the I2C master module 11 and sends the read instruction to the analog-to-digital conversion module 23, the analog-to-digital conversion module 23 reads the digital signal stored in the digital signal register 231 according to the read instruction and sends the read instruction to the overcurrent detection module 12 through the I2C slave module 21 and the I2C master module 11, and the overcurrent detection module 12 determines whether the driving current is overcurrent according to the received digital signal and sends an instruction for starting overcurrent protection to the corresponding output channel 22 through the I2C master module 11 and the I2C slave module 21 when the driving current is overcurrent.
It should be noted that, in the over-current protection system of the liquid crystal display panel of the present invention, the I2C host module 11 in the timing controller 1 is used to send an output channel selection instruction, the clock signal counting module 24 in the power management chip 2 is used to send an acquisition instruction at the blank display stage of a frame according to the start signal and the plurality of clock signals output by the timing control module 13, the analog-to-digital conversion module 23 acquires the driving current output by the corresponding output channel 22 according to the output channel selection instruction after receiving the acquisition instruction to obtain a digital signal, and the over-current detection module 12 determines whether the driving current is over-current through the digital signal, so as to avoid the influence of signal coupling on over-current detection, effectively improve the accuracy of over-current detection, and protect the internal circuit of the liquid crystal display panel.
Referring to fig. 4, and referring to fig. 1 to 3 and 5, based on the same inventive concept, the present invention further provides an overcurrent protection method for an lcd panel, applied to the overcurrent protection system of the lcd panel, including the following steps:
in step S1, the output channels 22 output driving currents to the lcd panel, where the driving currents are analog signals, and the timing control module 13 outputs a start signal and a plurality of clock signals.
Specifically, referring to fig. 5, in the preferred embodiment of the present invention, the plurality of clock signals include a first clock signal CK1, a second clock signal CK2, a third clock signal CK3, a fourth clock signal CK4, a fifth clock signal CK5 and a sixth clock signal CK 6.
Specifically, referring to fig. 2, in the preferred embodiment of the present invention, the clock signal counting module 24 includes a level shifting unit 241 and a clock signal counting unit 242 electrically connected to the level shifting unit 241. The clock signal counting unit 242 includes a processing unit 2421, a trigger channel register 2422 electrically connected to the processing unit 2421, a count register 2423 electrically connected to the processing unit 2421, and a trigger threshold register 2424 electrically connected to the processing unit 2421. The burst channel register 2422 stores a reference clock signal code corresponding to one of the plurality of clock signals output from the timing control unit 13. In the preferred embodiment of the present invention, the first clock signal CK1, the second clock signal CK2, the third clock signal CK3, the fourth clock signal CK4, the fifth clock signal CK5 and the sixth clock signal CK6 all have a code of 0, 1, 2, 3, 4 and 5 respectively, and the reference clock signal code stored in the trigger channel register 2422 is 1, and the reference clock signal code corresponds to the second clock signal CK 2. A trigger threshold register 2424 within the power management chip 2 stores a trigger threshold. The clock signals send out a plurality of pulses corresponding to one frame of picture of the liquid crystal display panel, the number of the pulses is equal to the storage trigger threshold, and the rising edge of the last pulse of the plurality of pulses corresponding to one frame of picture of the clock signal corresponding to the reference clock signal code is positioned in the blank display stage of the one frame of display picture. In the preferred embodiment of the present invention, the trigger threshold stored in the trigger threshold register 2424 of the power management chip 2 is 361, the number of the pulses sent by the plurality of clock signals corresponding to a frame of the lcd panel is 361, and the rising edge of the second clock signal CK2 corresponding to the last of the plurality of pulses of a frame of the lcd panel is located in the blank display period of the frame of the lcd panel.
In step S2, the I2C master module 11 sends an output channel selection command to the I2C slave module 21, and the I2C slave module 21 receives the output channel selection command from the I2C master module 11 and sends the output channel selection command to the analog-to-digital conversion module 23.
Preferably, the I2C master module 11 sends an output channel selection command to the I2C slave module 21 during the active display phase of one frame of screen of the lcd panel.
In step S3, the clock signal counting module 24 sends an acquisition instruction to the analog-to-digital conversion module 23 according to the start signal and the plurality of clock signals output by the timing control module 13.
Specifically, in step S3, the clock signal counting module 24 sends an acquisition instruction to the analog-to-digital conversion module 23 in a blank display stage of a frame of picture of the liquid crystal display panel according to the start signal and the plurality of clock signals output by the timing control module 13.
Further, in the preferred embodiment of the present invention, the level converting unit 241 receives the start signal and the plurality of data signals, converts the start signal and the plurality of data signals, and transmits the converted start signal and the plurality of clock signals to the processing unit 2421 of the clock signal counting unit 242, the processing unit 2421 receives the converted start signal and the plurality of clock signals, resets the value in the counting register 2423 to 0 at the time of the rising edge of the start signal, increases the value in the counting register 2423 by 1 when the value in the counting register 2423 is smaller than the trigger threshold stored in the trigger threshold register 2424, that is, is smaller than 361, when each rising edge of the clock signal corresponding to the reference clock signal code, that is, the second clock signal CK2, arrives, during the blank display period of one frame, the second clock signal CK2 corresponds to the last pulse of one frame, and the value in the counting register 2423 is 361 equal to the trigger threshold stored in the trigger threshold register 2424, the processing unit 2421 sends a collection instruction to the analog-to-digital conversion module 23 at this time and resets the value in the count register 2423 to 0, so that the clock signal counting module 24 sends the collection instruction to the analog-to-digital conversion module 23 in the blank display stage of one frame of picture of the liquid crystal display panel.
In step S4, after receiving the acquisition instruction, the analog-to-digital conversion module 23 acquires the driving current output by the corresponding output channel 22 according to the output channel selection instruction, and performs analog-to-digital conversion on the acquired driving current to generate a digital signal and store the digital signal.
Specifically, the analog-to-digital conversion module 23 has a digital signal register 231, and in step S4, the analog-to-digital conversion module 23 stores the digital signal by using the digital signal register 231.
In step S5, the I2C master module 11 sends a read command to the I2C slave module 21, and the I2C slave module 21 receives the read command from the I2C master module 11 and sends the read command to the analog-to-digital conversion module 23.
In step S6, the analog-to-digital conversion module 23 reads the stored digital signal according to the read command and sends the read digital signal to the over-current detection module 12 through the I2C slave module 21 and the I2C host module 11.
Specifically, in step S6, the analog-to-digital conversion module 23 reads the digital signal stored in the digital signal register 231 according to a read instruction.
In step S7, the over-current detection module 12 determines whether the driving current is over-current according to the received digital signal, and sends an instruction for starting over-current protection from the slave module 21 to the corresponding output channel 22 via the I2C host module 11 and the I2C when the driving current is over-current.
Specifically, in the step S7, the over-current detection module 12 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 result.
It should be noted that, in the over-current protection method for the liquid crystal display panel of the present invention, the I2C host module 11 in the timing controller 1 is used to send an output channel selection instruction, the clock signal counting module 24 in the power management chip 2 is used to send an acquisition instruction at the blank display stage of a frame according to the start signal and the plurality of clock signals output by the timing control module 13, the analog-to-digital conversion module 23 acquires the driving current output by the corresponding output channel 22 according to the output channel selection instruction after receiving the acquisition instruction to obtain a digital signal, and the over-current detection module 12 determines whether the driving current is over-current through the digital signal, so as to avoid the influence of signal coupling on over-current detection, effectively improve the accuracy of over-current detection, and protect the internal circuits of the liquid crystal display panel.
To sum up, the over-current protection system of the lcd panel of the present invention comprises a timing controller and a power management chip, wherein the timing controller comprises an I2C host module, an over-current detection module and a timing control module, the power management chip comprises an I2C slave module, a plurality of output channels, an analog-to-digital conversion module and a clock signal counting module, the I2C host module is utilized to send an output channel selection command, and a clock signal counting module is used for sending an acquisition instruction according to the initial signal and a plurality of clock signals output by the time sequence control module, after the analog-to-digital conversion module receives the acquisition instruction, the driving current output by the corresponding output channel is collected according to the output channel selection instruction to obtain a digital signal, and the overcurrent detection module determines whether the driving current is overcurrent or not through the digital signal, so that the accuracy of overcurrent detection can be effectively improved, and the internal circuit of the liquid crystal display panel is protected. The overcurrent protection method of the liquid crystal display panel can improve the accuracy of overcurrent detection, effectively protect the 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 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. The overcurrent protection system of the liquid crystal display panel is characterized by comprising a time schedule controller (1) and a power management chip (2) electrically connected with the time schedule controller (1);
the time sequence controller (1) comprises an I2C host module (11), an overcurrent detection module (12) and a time sequence control module (13), wherein the overcurrent detection module (12) is electrically connected with the I2C host module (11); the power management chip (2) comprises an I2C slave module (21) electrically connected with an I2C host module (11) of the time schedule controller (1), a plurality of output channels (22) electrically connected with the I2C slave module (21), an analog-to-digital conversion module (23) electrically connected with the I2C slave module (21) and the output channels (22), and a clock signal counting module (24) electrically connected with the analog-to-digital conversion module (23) and a time schedule control module (13) in the time schedule controller (1);
the output channels (22) are used for outputting driving current to the liquid crystal display panel, and the driving current is an analog signal;
the time sequence control module (13) is used for outputting a starting signal and a plurality of clock signals;
the I2C master module (11) is used for sending an output channel selection instruction and a reading instruction to the I2C slave module (21);
the I2C slave module (21) is used for receiving an output channel selection instruction and a reading instruction from the I2C master module (11) and sending the output channel selection instruction and the reading instruction to the analog-to-digital conversion module (23);
the clock signal counting module (24) is used for sending an acquisition instruction to the analog-to-digital conversion module (23) according to the initial signal and the plurality of clock signals output by the time sequence control module (13);
the analog-to-digital conversion module (23) is used for acquiring the driving current output by the corresponding output channel (22) according to the output channel selection instruction after receiving the acquisition instruction, performing analog-to-digital conversion on the acquired driving current to generate and store a digital signal, and sending the stored digital signal to the overcurrent detection module (12) after receiving the reading instruction;
the overcurrent detection module (12) 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 corresponding output channel (22) when the driving current is overcurrent;
the clock signal counting module (24) sends an acquisition instruction to the analog-to-digital conversion module (23) in a blank display stage of a frame of picture of the liquid crystal display panel according to the initial signal and the plurality of clock signals output by the time sequence control module (13);
the I2C master module (11) sends an output channel selection command to the I2C slave module (21) in the effective display stage of one frame of picture of the liquid crystal display panel.
2. The over-current protection system of the lcd panel according to claim 1, wherein the analog-to-digital conversion module (23) collects the driving current outputted from the corresponding output channel (22) and performs the analog-to-digital conversion on the collected driving current in a blank display stage of a frame of the lcd panel.
3. The over-current protection system of the LCD panel according to claim 1, wherein the clock signal counting module (24) comprises a level converting unit (241) and a clock signal counting unit (242) electrically connected to the level converting unit (241); the level conversion unit (241) is electrically connected with a time sequence control module (13) in the time sequence controller (1); the clock signal counting unit (242) is electrically connected with the analog-to-digital conversion module (23);
the clock signal counting unit (242) comprises a processing unit (2421), a trigger channel register (2422) electrically connected with the processing unit (2421), a counting register (2423) electrically connected with the processing unit (2421), and a trigger threshold register (2424) electrically connected with the processing unit (2421); the processing unit (2421) is electrically connected with the level conversion unit (241) and the analog-to-digital conversion module (23);
the level conversion unit (241) is used for receiving and converting the initial signal and the plurality of clock signals output by the time sequence control module (13), and transmitting the converted initial signal and the plurality of clock signals to the processing unit (2421);
the trigger channel register (2422) is used for storing a reference clock signal code, and the reference clock signal code corresponds to one of a plurality of clock signals output by the timing control unit (13);
a trigger threshold register (2424) for storing a trigger threshold;
the processing unit (2421) is used for receiving the converted initial signal and a plurality of clock signals, resetting the value in the counting register (2423) to 0 at the rising edge moment of the initial signal, increasing the value in the counting register (2423) by 1 when each rising edge of the clock signal corresponding to the reference clock signal code arrives when the value in the counting register (2423) is smaller than the trigger threshold value stored in the trigger threshold register (2424), and sending a collection instruction to the analog-to-digital conversion module (23) and resetting the value in the counting register (2423) to 0 when the value in the counting register (2423) is equal to the trigger threshold value stored in the trigger threshold register (2424);
the clock signals send out a plurality of pulses corresponding to one frame of picture of the liquid crystal display panel, the number of the pulses is equal to the storage trigger threshold, and the rising edge of the last pulse of the plurality of pulses corresponding to one frame of picture of the clock signal corresponding to the reference clock signal code is positioned in the blank display stage of the one frame of display picture.
4. The over-current protection system of the LCD panel according to claim 3, wherein the trigger channel register (2422), the count register (2423) and the trigger threshold register (2424) are electrically connected to the I2C slave module (21);
the I2C host module (11) is also used for sending an initialization instruction;
the I2C slave module (21) is also used for receiving an initialization instruction from the I2C master module (11) and sending the initialization instruction to a trigger channel register (2422), a count register (2423) and a trigger threshold register (2424);
the trigger channel register (2422), the count register (2423) and the trigger threshold register (2424) are initialized according to the initialization instruction after receiving the initialization instruction.
5. The over-current protection system of the LCD panel according to claim 4, wherein the clock signal counting unit (242) further comprises an OCP enable control unit (2425) electrically connected to the processing unit (2421);
the OCP enabling control unit (2425) accesses an enabling signal, and in the state that the enabling signal accessed by the OCP enabling control unit (2425) is high level, the processing unit (2421) sends a collecting instruction to the analog-to-digital conversion module (23) when the value in the counting register (2423) is equal to the trigger threshold value stored by the trigger threshold value register (2424); when the enabling signal accessed by the OCP enabling control unit (2425) is in a low level state, the processing unit (2421) does not send out a collecting instruction;
the OCP enable control unit (2425) is further electrically connected with the I2C slave module (21), and the I2C slave module (21) further sends an initialization instruction to the OCP enable control unit (2425) after receiving the initialization instruction; the OCP enabling control unit (2425) initializes according to an initialization instruction after receiving the initialization instruction.
6. The overcurrent protection system for a liquid crystal display panel according to claim 1, wherein the analog-to-digital conversion module (23) has a digital signal register (231), and the analog-to-digital conversion module (23) stores the digital signal using the digital signal register (231).
7. The over-current protection system of the lcd panel of claim 1, wherein the over-current detection module (12) 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 result.
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, characterized by comprising the following steps:
step S1, the output channels (22) output driving current to the liquid crystal display panel, the driving current is an analog signal, and the time sequence control module (13) outputs a starting signal and a plurality of clock signals;
step S2, the I2C master module (11) sends an output channel selection instruction to the I2C slave module (21), and the I2C slave module (21) receives the output channel selection instruction from the I2C master module (11) and sends the output channel selection instruction to the analog-to-digital conversion module (23);
step S3, the clock signal counting module (24) sends an acquisition instruction to the analog-to-digital conversion module (23) according to the initial signal and the plurality of clock signals output by the time sequence control module (13);
step S4, after receiving the acquisition instruction, the analog-to-digital conversion module (23) acquires the driving current output by the corresponding output channel (22) according to the output channel selection instruction, and performs analog-to-digital conversion on the acquired driving current to generate and store a digital signal;
step S5, the I2C master module (11) sends a reading instruction to the I2C slave module (21), and the I2C slave module (21) receives the reading instruction from the I2C master module (11) and sends the reading instruction to the analog-to-digital conversion module (23);
step S6, the analog-to-digital conversion module (23) reads the stored digital signal according to the reading instruction and sends the digital signal to the over-current detection module (12);
step S7, the over-current detection module (12) determines whether the driving current is over-current according to the received digital signal, and sends an instruction to start over-current protection to the corresponding output channel (22) when the driving current is over-current.
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| CN109449877B (en) * | 2018-12-03 | 2020-05-12 | 惠科股份有限公司 | Overcurrent protection method and display device |
| CN109617008B (en) | 2018-12-12 | 2021-02-02 | 惠科股份有限公司 | Overcurrent protection method, display panel and display device |
| CN109584829B (en) * | 2018-12-25 | 2020-10-30 | 惠科股份有限公司 | Overcurrent protection method, display panel and overcurrent protection device |
| 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 |
| CN110148380B (en) * | 2019-04-30 | 2020-11-24 | 深圳市华星光电半导体显示技术有限公司 | Display picture adjusting method and device and storage medium |
| CN110444162B (en) * | 2019-07-18 | 2020-10-16 | 武汉华星光电半导体显示技术有限公司 | Display device and power management chip for same |
| CN111192542B (en) * | 2020-02-27 | 2023-06-27 | Tcl华星光电技术有限公司 | Static electricity eliminating device and method for driving chip and display device |
| WO2023221101A1 (en) * | 2022-05-20 | 2023-11-23 | 京东方科技集团股份有限公司 | Power supply circuit and drive method therefor, printed circuit board, and display module and apparatus |
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