CN109346022B - Protection method of display panel, display panel and computer readable storage medium - Google Patents
Protection method of display panel, display panel and computer readable storage medium Download PDFInfo
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- CN109346022B CN109346022B CN201811514489.9A CN201811514489A CN109346022B CN 109346022 B CN109346022 B CN 109346022B CN 201811514489 A CN201811514489 A CN 201811514489A CN 109346022 B CN109346022 B CN 109346022B
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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
- G09G3/3696—Generation of voltages supplied to electrode drivers
Abstract
The invention discloses a protection method of a display panel, which comprises the following steps: when a signal closing enabling instruction sent by a system chip is monitored, black picture display data are obtained; and sending the black picture display data to a display driver so that the display driver controls a display panel to display the black picture. The invention also discloses a display panel and a computer readable storage medium. The invention realizes the purpose of reducing the voltage on the electrode of the display panel by controlling the display panel to display the black picture, solves the technical problem that the liquid crystal generates the polarization phenomenon after the display panel executes a plurality of shutdown actions, and prolongs the service life of the display panel.
Description
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to a protection method based on a display panel, and a computer-readable storage medium.
Background
Liquid Crystal displays are called "liquid Crystal displays" (lcds) for short, liquid Crystal displays (lcds) for which the arrangement of the liquid Crystal molecular structure is similar to that of a Firework rod and are called "liquid crystals", and liquid Crystal displays manufactured using such liquid crystals are called "lcds". In the liquid crystal television, a voltage is applied to a liquid crystal between two glasses to reproduce a picture by a change in molecular arrangement and a change in meandering, and the screen produces a picture by collision of an electron group and forms a picture by transmission and reflection of external light.
In the prior art, in order to prevent latch up of the chip, the lcd panel requires that the lcd panel first cuts off the data signal and then turns off the power supply when the lcd is turned off. Therefore, when the liquid crystal display performs a shutdown operation, the SOC (system on chip) will first cut off data signals such as LVDS (Low Voltage Differential Signaling) signals or VBO (V-by-OneHS) signals, and then turn off the power supply after a preset duration. Since the power supply is not turned off after the data signal is cut off, the voltage value at the time of cutting off the data signal is maintained at both sides of the liquid crystal. Therefore, the liquid crystal is always in the dc driving state from the time when the data signal is turned off to the time when the power is turned off, so that the liquid crystal is polarized after the liquid crystal display performs a plurality of turn-off operations.
Disclosure of Invention
The present invention provides a protection method based on a display panel, a display panel and a computer readable storage medium, and aims to solve the technical problem that liquid crystal generates a polarization phenomenon after the display panel performs a plurality of shutdown actions, so as to prolong the service life of the display panel.
In order to achieve the above object, the present invention provides a method for protecting a display panel, comprising the steps of:
when a signal closing enabling instruction sent by a system chip is monitored, black picture display data are obtained;
and sending the black picture display data to a display driver so that the display driver controls a display panel to display the black picture.
Optionally, before the step of acquiring the black picture display data when the signal shutdown enable instruction sent by the system chip is monitored, the method further includes:
monitoring a level signal of a signal closing enabling pin of the system chip in real time;
and when the level signal changes, judging that the system chip sends the signal closing enabling instruction at the current moment.
Optionally, after the step of sending the black picture display data to a display driver for the display driver to control a display panel to display the black picture, the method further includes:
acquiring electrode voltage, wherein the electrode voltage comprises the voltage of a display electrode and/or the voltage of a common electrode;
and enabling a signal to close the program when the electrode voltage is less than or equal to a preset threshold value, so as to control to cut off the data signal through the signal closing program.
Optionally, after the step of obtaining the electrode voltage, wherein the electrode voltage includes a voltage of the display electrode and/or a voltage of the common electrode, the method further includes:
and when the electrode voltage is greater than the preset threshold value, sending a shutdown termination instruction to the system chip, so that the system chip terminates the current shutdown action when receiving the shutdown termination instruction.
Optionally, when the electrode voltage is less than or equal to a preset threshold, the step of enabling the signal to turn off the program includes:
when the electrode voltage is smaller than or equal to the preset threshold value, outputting an enabling instruction;
enabling the signal to close the program according to the enabling instruction through the enabling instruction.
Optionally, the black frame display data includes electrode voltage control information, so that when the display driver receives the black frame display data, the display driver adjusts the electrode voltage according to the electrode voltage control information.
In order to achieve the above object, the present invention further provides a display panel, comprising: the protection method comprises the following steps of a memory, a processor and a liquid crystal protection program which is stored on the memory and can run on the processor, wherein the steps of the protection method for the display panel are realized when the liquid crystal protection program is executed by the processor.
In addition, to achieve the above object, the present invention further provides a computer readable storage medium, wherein a liquid crystal protection program is stored on the computer readable storage medium, and when the liquid crystal protection program is executed by a processor, the steps of the method for protecting a display panel as described above are implemented.
According to the protection method of the display panel, the display panel and the storage medium provided by the embodiment of the invention, when a signal closing enabling instruction sent by a system chip is monitored, black picture display data are obtained and then sent to the display driver, so that the display driver can control the display panel to display black pictures. According to the invention, when a signal closing enabling instruction sent by the system chip is monitored, namely the system chip is about to cut off a data signal of the display panel, the display panel is controlled to display a black picture first, and when the display panel displays the black picture, the electrode voltage is close to 0, so that when the display panel displays the black picture, the phenomenon that liquid crystal is driven by direct current cannot occur on the display panel due to the cutting off of the data signal, the damage to the liquid crystal caused by shutdown is effectively avoided, and the service life of the display panel is prolonged.
Drawings
Fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for protecting a display panel according to a first embodiment of the present invention;
FIG. 3 is a flowchart illustrating a second embodiment of a method for protecting a display panel according to the present invention;
FIG. 4 is a flowchart illustrating a method for protecting a display panel according to a third embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for protecting a display panel according to a fourth embodiment of the present invention;
fig. 6 is a flowchart illustrating a protection method for a display panel according to a fifth embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows:
when a signal closing enabling instruction sent by a system chip is monitored, black picture display data are obtained;
and sending the black picture display data to a display driver so that the display driver controls a display panel to display the black picture.
According to the protection method of the display panel, the display panel and the storage medium provided by the embodiment of the invention, when a signal closing enabling instruction sent by a system chip is monitored, black picture display data are obtained and then sent to the display driver, so that the display driver can control the display panel to display black pictures. According to the invention, when a signal closing enabling instruction sent by the system chip is monitored, namely the system chip is about to cut off a data signal of the display panel, the display panel is controlled to display a black picture first, and when the display panel displays the black picture, the electrode voltage is close to 0, so that when the display panel displays the black picture, the phenomenon that liquid crystal is driven by direct current cannot occur on the display panel due to the cutting off of the data signal, the damage to the liquid crystal caused by shutdown is effectively avoided, and the service life of the display panel is prolonged.
As shown in fig. 1, fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention.
The terminal of the embodiment of the invention can display a panel.
As shown in fig. 1, the terminal may include: a processor 1001, such as a CPU, a display driver 1004, a logic board 1003, a memory 1005, and a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the terminal structure shown in fig. 1 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein a liquid crystal protection program.
In the terminal shown in fig. 1, the processor 1001 may be configured to call the liquid crystal protection program stored in the memory 1005, and perform the following operations:
when a signal closing enabling instruction sent by a system chip is monitored, black picture display data are obtained;
and sending the black picture display data to a display driver so that the display driver controls a display panel to display the black picture.
Further, the processor 1001 may be configured to call the liquid crystal protection program stored in the memory 1005, and further perform the following operations:
monitoring a level signal of a signal closing enabling pin of the system chip in real time;
and when the level signal changes, judging that the system chip sends the signal closing enabling instruction at the current moment.
Further, the processor 1001 may be configured to call the liquid crystal protection program stored in the memory 1005, and further perform the following operations:
acquiring electrode voltage, wherein the electrode voltage comprises the voltage of a display electrode and/or the voltage of a common electrode;
and enabling a signal to close the program when the electrode voltage is less than or equal to a preset threshold value, so as to control to cut off the data signal through the signal closing program.
Further, the processor 1001 may be configured to call the liquid crystal protection program stored in the memory 1005, and further perform the following operations:
and when the electrode voltage is greater than the preset threshold value, sending a shutdown termination instruction to the system chip, so that the system chip terminates the current shutdown action when receiving the shutdown termination instruction.
Further, the processor 1001 may be configured to call the liquid crystal protection program stored in the memory 1005, and further perform the following operations:
when the electrode voltage is smaller than or equal to the preset threshold value, outputting an enabling instruction;
enabling the signal to close the program according to the enabling instruction through the enabling instruction.
Referring to fig. 2, a protection method of a display panel according to a first embodiment of the present invention includes:
step S10, when a signal closing enabling instruction sent by the system chip is monitored, black picture display data are obtained;
in this embodiment, the execution main body may be a logic board TCON of the display panel, where the TCON board is used to convert LVDS image data input signals (input signals include RGB data signals, clock signals, and control signals) sent from the digital board into LVDS signals capable of driving the liquid crystal panel after being processed by the logic board, and then directly send the LVDS signals to an LVDS receiving chip of the liquid crystal panel, i.e., a display driver, and further the display driver drives the liquid crystal panel to display an image according to the received LVDS.
When the TCON monitors a signal closing enabling instruction sent by the system chip, namely the SOC generates a signal off enable which is a high level, the TCON acquires black picture display data. The black picture display data comprises electrode voltage for controlling and driving the liquid crystal screen to display black picture images.
Specifically, when the TCON monitors that the signal off enable is at a high level, it is determined that the SOC system is about to perform an operation of cutting off the data signal, and at this time, the TCON acquires black screen display data. The black picture refers to a full black picture, and when the display panel displays the full black picture, the voltage on the display electrode and the voltage on the shared electrode are infinitely close to 0V, wherein the display panel is used for the liquid crystal display.
In the principle of liquid crystal display, different electric fields (i.e., different potential differences and voltages) are applied to different liquid crystal sites to control the liquid crystal twist and achieve the purpose of light transmission. When a black picture is displayed, the electric field of the corresponding point position is removed, namely, no potential difference exists at the two ends of the liquid crystal, so that the liquid crystal is not twisted, backlight is shielded, and the effect of displaying black is achieved.
Step S20, sending the black frame display data to a display driver for the display driver to control a display panel to display a black frame.
In this embodiment, when the TCON acquires the black screen display data, the black screen display data is processed and converted into an LVDS signal capable of driving the liquid crystal screen, and the LVDS signal capable of driving the liquid crystal screen is sent to the display driver, so that the display driver controls the liquid crystal screen to display the black screen when receiving the LVDS signal.
After the liquid crystal display displays the black screen, the SOC continues to execute the command of cutting off the data signal, when the SOC finishes the command of cutting off the data signal, but the POWER supply POWER is not cut off, namely the data signal is cut off, and when the POWER supply is cut off, the voltage on the common electrode and the display electrode of the display panel keeps the voltage when the black screen is displayed. Thereby making the voltage across the liquid crystal of the display panel close to 0V.
In this embodiment, when detecting the enable instruction of the SOC cut-off data signal, the liquid crystal display is controlled to display a black picture, so that no dc voltage exists at the two ends of the liquid crystal when the display panel cuts off the data signal, thereby preventing the liquid crystal from being driven by the dc to generate a polarization phenomenon when the display panel is turned off, and prolonging the service life of the display panel.
Further, referring to fig. 3, a second embodiment of the method for protecting a display panel according to the present invention, based on the first embodiment, before the step S10, further includes:
step S30, monitoring the level signal of the signal closing enable pin of the system chip in real time;
in this embodiment, the lcd panel is required to turn off the data signal and then turn off the power supply when the lcd panel is turned off to prevent the chip from latch-up. Therefore, when the liquid crystal display performs a shutdown operation, the SOC (system on chip) will first cut off the data signals such as the LVDS signal or the VBO signal, and then turn off the power supply after a preset time period.
When the front-end system executes the action of cutting off the data signal, a signal off enable signal is output through a pin of the system SOC chip, namely, a level value corresponding to the pin is changed. The TOCN chip may monitor the level signal of the pin in real time.
It should be noted that, in an operating state, the pin may be always in a low level state, and when the level value output by the pin jumps to a high level, the front-end system outputs a signal to close the enable instruction at the current time through the pin.
And step S40, when the level signal changes, judging that the system chip sends the signal closing enabling instruction at the current moment.
In this embodiment, when the level signal is checked to change, it is determined that the front-end system is outputting a signal turn-off enable command through the pin at the current time.
It should be noted that, in this embodiment, it is preferable that the pin level is a low level in a normal operating state, and when the pin level transitions to a high level, the trigger signal turns off the enable instruction. However, this embodiment is not limited to this, that is, the pin may also be at a high level in a normal operating state, and when the pin transitions to a low level, it is determined that the trigger signal turns off the enable instruction.
In this embodiment, the level signal of the system chip signal shutdown enable pin is monitored, and when the level signal jumps, it is determined that the signal shutdown enable instruction is triggered, so as to achieve the purpose of monitoring the timing of the front-end system executing the action of cutting off the data signal.
Further, referring to fig. 4, a third embodiment of the method for protecting a display panel according to the present invention, based on the first to second embodiments, further includes, after the step S20:
step S50, obtaining electrode voltage, wherein the electrode voltage comprises the voltage of a display electrode and/or the voltage of a common electrode;
and step S60, enabling a signal to close the program when the electrode voltage is less than or equal to a preset threshold value, so as to control the data signal to be cut off through the signal to close the program.
In this embodiment, the electrode voltage is obtained first, wherein the click voltage may include the voltage of the display electrode and/or the voltage of the common electrode. And when the electrode voltage only comprises the voltage of the display electrode or the voltage of the common electrode, judging whether the voltage of the display electrode or the voltage of the common electrode is smaller than a preset threshold value, and when the electrode voltage comprises the voltage of the display electrode and the voltage of the common electrode, judging whether the average voltage of the display electrode and the voltage of the common electrode is smaller than the preset threshold value.
And enabling a signal closing program when the electrode voltage is smaller than a preset threshold value, and achieving the purpose of cutting off the data signal of the display panel through the signal closing program.
It should be noted that, when the liquid crystal display is produced, the preset threshold is written into the bottom layer firmware by a manufacturer. The preset threshold is a voltage threshold and is a constant. For example, the preset threshold may be equal to 0.0001V.
In this embodiment, the electrode voltage is obtained first, and when the electrode voltage is determined to be less than the preset threshold, the data signal is cut off, so that it is ensured that the liquid crystal is not polarized by the dc signal generated by cutting off the data signal.
Further, referring to fig. 5, a fourth embodiment of the method for protecting a display panel according to the present invention, based on the first to third embodiments, further includes, after the step S50:
step S70, when the electrode voltage is greater than the preset threshold, sending a shutdown termination instruction to the system chip, so that the system chip terminates the current shutdown action when receiving the shutdown termination instruction.
In this embodiment, when the electrode voltage is greater than the predetermined threshold, if the data signal is cut off, a dc voltage greater than the safety voltage is generated at two ends of the liquid crystal, so that the liquid crystal is polarized. Therefore, in this embodiment, when the electrode voltage is greater than the preset threshold, a termination instruction is sent to the system chip, and when the system chip receives the termination instruction, the shutdown action currently being executed is terminated, that is, the action of currently cutting off the data signal is terminated.
Specifically, when the system chip receives a termination instruction, the current action of cutting off the data signal is terminated. After the action of cutting off the data signal is terminated, the system chip can control the signal off enable pin again to generate level jump, so that the TCON board is triggered again to control the action of displaying a black picture by the liquid crystal screen, and the electrode voltage is reduced. And when the electrode voltage is smaller than a preset threshold value, executing the action of cutting off the data signal, and cutting off the power supply after cutting off the data signal to finish the shutdown action.
It should be noted that, when the liquid crystal display is produced, the preset threshold is written into the bottom layer firmware by a manufacturer. The preset threshold is a voltage threshold and is a constant. For example, the preset threshold may be equal to 0.0001V.
In this embodiment, when the electrode voltage is greater than the preset threshold, a shutdown termination instruction is sent to the system chip, so that the system chip terminates the current shutdown action when receiving the shutdown termination instruction, thereby preventing the phenomenon that the liquid crystal is driven by the direct current to generate a polarization phenomenon due to the fact that the data signal is cut off when the electrode voltage of the display panel is greater than the preset threshold.
Further, referring to fig. 6, a fifth embodiment of the method for protecting a display panel according to the present invention, based on the first to third embodiments, the step S60 includes:
step S61, when the electrode voltage is less than or equal to the preset threshold value, outputting an enabling instruction;
and step S62, enabling the signal to close the program according to the enabling instruction through the enabling instruction.
In this embodiment, the signal shutdown procedure may be set to a dual enable trigger. Because the signal closing program is generally controlled by the front-end system, when the front-end system receives a shutdown instruction, an enable instruction is output to the signal closing program, and then the signal closing program controls to cut off the data signal.
The signal shutdown program described in this embodiment is provided with a dual-enable trigger, that is, the signal shutdown program does not execute the function of cutting off the data signal when receiving only the enable command sent by the front-end system, and executes the function of cutting off the data signal only when receiving the enable command sent by the front-end system and receiving the signal enable command sent by the TCON.
In this embodiment, when the electrode voltage is less than or equal to the preset threshold, an enable instruction is output, and the signal shutdown procedure is enabled according to the enable instruction through the enable instruction, so that the phenomenon of polarization caused by direct current driving after the data signal is cut off by the liquid crystal is prevented.
In addition, an embodiment of the present invention further provides a display panel, where the display panel includes: the protection method comprises a memory, a processor and a liquid crystal protection program which is stored on the memory and can run on the processor, wherein the steps of the protection method of the display panel according to the various embodiments are realized when the liquid crystal protection program is executed by the processor.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a liquid crystal protection program is stored on the computer-readable storage medium, and when the liquid crystal protection program is executed by a processor, the steps of the method for protecting a display panel according to the above embodiments are implemented.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., lcd tv, lcd display, etc.) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A protection method of a display panel is characterized by comprising the following steps:
when a signal closing enabling instruction sent by a system chip is monitored, judging that the system chip is about to execute an action of cutting off a data signal, and acquiring black picture display data;
sending the black picture display data to a display driver to control a display panel to display a black picture by the display driver, wherein when the display panel displays the black picture, the liquid crystal is not twisted; and after the display panel displays a black picture, continuously executing an instruction of cutting off the data signal by the system chip.
2. The method for protecting a display panel according to claim 1, wherein before the step of acquiring the black screen display data when the system chip is monitored to generate the signal shutdown enable command, the method further comprises:
monitoring a level signal of a signal closing enabling pin of the system chip in real time;
and when the level signal changes, judging that the system chip sends the signal closing enabling instruction at the current moment.
3. The method for protecting a display panel according to claim 1, wherein after the step of sending the black frame display data to a display driver for the display driver to control the display panel to display the black frame, the method further comprises:
acquiring electrode voltage, wherein the electrode voltage comprises the voltage of a display electrode and/or the voltage of a common electrode;
and enabling a signal to close the program when the electrode voltage is less than or equal to a preset threshold value, so as to control to cut off the data signal through the signal closing program.
4. The method for protecting a display panel according to claim 3, wherein the step of obtaining the electrode voltage, wherein the electrode voltage includes a voltage of a display electrode and/or a voltage of a common electrode, further comprises:
and when the electrode voltage is greater than the preset threshold value, sending a shutdown termination instruction to the system chip, so that the system chip terminates the current shutdown action when receiving the shutdown termination instruction.
5. The method for protecting a display panel according to claim 3, wherein the step of enabling the signal to turn off the program when the electrode voltage is less than or equal to a preset threshold comprises:
when the electrode voltage is smaller than or equal to the preset threshold value, outputting an enabling instruction;
enabling the signal to close the program according to the enabling instruction through the enabling instruction.
6. The method according to claim 3, wherein the black display data includes electrode voltage control information for the display driver to adjust the electrode voltage according to the electrode voltage control information when receiving the black display data.
7. A display panel, comprising: memory, a processor and a liquid crystal protection program stored on the memory and executable on the processor, the liquid crystal protection program when executed by the processor implementing the steps of the method of protecting a display panel according to any one of claims 1 to 6.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a liquid crystal protection program, which when executed by a processor implements the steps of the protection method of the display panel according to any one of claims 1 to 6.
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1588528A (en) * | 2004-08-09 | 2005-03-02 | 友达光电股份有限公司 | Liquid crystal display and method for improving picture flash and residual picture in turn off process |
| CN101727853A (en) * | 2008-10-31 | 2010-06-09 | 瀚宇彩晶股份有限公司 | Liquid crystal display and control method thereof |
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| CN109346022A (en) | 2019-02-15 |
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