CN113096611B - Electrostatic protection method and device and display device - Google Patents
Electrostatic protection method and device and display device Download PDFInfo
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- CN113096611B CN113096611B CN202110357758.0A CN202110357758A CN113096611B CN 113096611 B CN113096611 B CN 113096611B CN 202110357758 A CN202110357758 A CN 202110357758A CN 113096611 B CN113096611 B CN 113096611B
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- 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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Abstract
An electrostatic protection method, an electrostatic protection device and a display device are disclosed. The electrostatic protection method comprises the following steps: a pixel driving module of the display panel receives and caches a first signal output by the time sequence control module; the pixel driving module extracts a first signal in a preset detection time period from a cache, compares the extracted first signal with a first signal expected to be received, and determines whether electrostatic interference is detected according to a comparison result; and if the pixel driving module detects the electrostatic interference, the expected received first signal is used for replacing the actually received first signal to drive the pixel unit of the display panel. The technical scheme can avoid the abnormal phenomena of black screen and screen flashing of the picture during electrostatic interference.
Description
Technical Field
The present disclosure relates to but not limited to the field of display technologies, and in particular, to a method and an apparatus for electrostatic protection and a display apparatus.
Background
A TCON (Timing Controller) chip is a logic control core of the display circuit and is responsible for outputting control signals and data signals to a display driving chip (Source IC).
After the display driver chip loads the picture data, if the control signal output by the TCON chip to the display driver chip is lost or varied due to the electrostatic interference, the display driver chip may not receive the control signal or receive an erroneous control signal, thereby causing an abnormal output picture or a black screen.
Disclosure of Invention
In a first aspect, an embodiment of the present disclosure provides an electrostatic protection method, including the following steps:
a pixel driving module of the display panel receives and caches a first signal output by the time sequence control module;
the pixel driving module extracts a first signal in a preset detection period from a cache, compares the extracted first signal with a first signal expected to be received, and determines whether electrostatic interference is detected according to a comparison result;
if the pixel driving module detects the electrostatic interference, the expected received first signal is used to replace the actually received first signal to drive the pixel units of the display panel:
in a second aspect, an embodiment of the present disclosure provides an electrostatic protection apparatus, including a pixel driving module of a display panel, where the pixel driving module is configured to receive a first signal output by a timing control module and perform buffering; extracting a first signal in a preset detection time period from a cache, comparing the extracted first signal with a first signal expected to be received, and determining whether electrostatic interference is detected according to a comparison result; and if the pixel driving module detects the electrostatic interference, using the expected received first signal to replace the actually received first signal to drive the pixel unit of the display panel.
In a third aspect, embodiments of the present disclosure provide a display device, including the above electrostatic protection device.
According to the electrostatic protection method, the electrostatic protection device and the display device, the pixel driving module of the display panel receives and caches the first signal output by the time sequence control module, then the first signal is detected in real time, and whether electrostatic interference is detected or not can be determined by comparing the actually received signal with the expected received signal. If the pixel driving module detects the electrostatic interference, the expected received first signal is used for replacing the actually received first signal to drive the pixel unit of the display panel, so that the pixel driving module can use the correct signal to drive the pixel unit, and the abnormal phenomena of black screen and flashing screen of the picture are avoided.
Drawings
The accompanying drawings are included to provide an understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a flowchart of an electrostatic discharge protection method according to an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of an electrostatic protection device according to an embodiment of the disclosure;
fig. 3 is a schematic structural diagram of a pixel driving module according to an embodiment of the disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the embodiments may be implemented in a plurality of different forms. Those skilled in the art can readily appreciate the fact that the forms and details may be varied into a variety of forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the contents described in the following embodiments. The embodiments and features of the embodiments in the present disclosure may be arbitrarily combined with each other without conflict.
In the drawings, the size of each component, the thickness of layers, or regions may be exaggerated for clarity. Therefore, one aspect of the present disclosure is not necessarily limited to the dimensions, and the shapes and sizes of the components in the drawings do not reflect a true scale. Further, the drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes, numerical values, and the like shown in the drawings.
The ordinal numbers such as "first", "second", "third", and the like in the present specification are provided for avoiding confusion among the constituent elements, and are not limited in number.
In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited. For example, it may be a fixed connection, or a removable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.
In this specification, "electrically connected" includes a case where constituent elements are connected together by an element having some kind of electrical action. The "element having a certain electric function" is not particularly limited as long as it can transmit and receive an electric signal between connected components. Examples of the "element having some kind of electric function" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, other elements having various functions, and the like.
"about" in this disclosure means that the limits are not strictly defined, and that the numerical values are within the tolerances allowed for the process and measurement.
When static electricity occurs, the control signal output by the TCON chip to the display driving chip may be disturbed, for example, the control signal of positive and negative frame polarity is incorrect and keeps high level or low level continuously. Because a real-time synchronous state does not exist between the display driving chip and the TCON chip, data transmission between the display driving chip and the TCON chip may not be interrupted before and after static electricity occurs, if the display driving chip outputs according to wrong positive and negative frame polarity control signals, a positive frame or a negative frame may be continuously output, and after the same-polarity frame is accumulated and output, charge accumulation may be caused, so that liquid crystal polarization imbalance is caused, and abnormal phenomena such as a Flicker (Flicker) are caused. When static electricity occurs, the TCON chip may also detect that static electricity occurs and stop outputting the related control signal, for example, stop outputting the data output control signal, thereby causing the screen to be blank.
As shown in fig. 1, an embodiment of the present disclosure provides an electrostatic protection method, including the following steps:
step S10, a pixel driving module of the display panel receives and caches a first signal output by a time sequence control module;
step S20, the pixel driving module extracts a first signal in a preset detection time period from a cache, compares the extracted first signal with a first signal expected to be received, and determines whether electrostatic interference is detected according to a comparison result;
in step S30, if the pixel driving module detects the electrostatic interference, the expected received first signal is used to drive the pixel unit of the display panel instead of the actually received first signal.
In the electrostatic protection method in the above embodiment, the pixel driving module of the display panel receives and buffers the first signal output by the timing control module, and then detects the first signal in real time, so as to determine whether electrostatic interference is detected by comparing the actually received signal with the expected received signal. If the pixel driving module detects the electrostatic interference, the expected received first signal is used for replacing the actually received first signal to drive the pixel unit of the display panel, so that the pixel driving module can use the correct signal to drive the pixel unit, and the abnormal phenomena of black screen and screen flashing of the picture are avoided.
In some exemplary embodiments, the pixel driving module may be a Source driver chip (Source IC) of the liquid crystal display panel, and the Timing control module may be a TCON (Timing Controller) chip of the liquid crystal display panel.
In some exemplary embodiments, the first signal comprises: a non-differential signal.
When static electricity occurs, different output signals on a TCON (timing controller) chip are affected by the static electricity to different degrees. In general, non-differential signals may be more susceptible to static electricity than differential signals.
In some exemplary embodiments, the first signal comprises: a periodic signal.
In some exemplary embodiments, the preset detection period includes: one or more periods of the first signal.
In some exemplary embodiments, the first signal comprises: a data output control signal and/or a positive and negative frame polarity control signal.
In some exemplary embodiments, the periodic unit of the first signal includes: a line or a frame. That is, the preset detection period may be one frame or a plurality of frames, or may be one row or a plurality of rows.
In the field of liquid crystal display, the control signal output by the TCON chip to the pixel driving module is usually a non-differential signal, and the data signal is usually a differential signal. The data output control signal is used for controlling the time sequence of the data signal output by the pixel driving module, namely when the data signal is output. The positive and negative frame polarity control signals are used for controlling the polarity of the voltage signals output by the pixel driving module (positive when higher than the common voltage, and negative when lower than the common voltage). In the field of liquid crystal display, it is common to output a positive voltage to the pixel cells (the driving voltage of the pixel cells is higher than the common voltage) in odd frames (or even frames) and a negative voltage to the pixel cells (the driving voltage of the pixel cells is lower than the common voltage) in even frames (or odd frames). By alternating the positive and negative frames, it is possible to prevent the liquid crystal molecules from being always polarized by an electric field in one direction. The common voltage refers to a voltage on a common electrode of a pixel unit of the display screen. The voltage signal output by the pixel driving module is sent to the pixel electrode of the pixel unit of the display screen, and the deflection of the liquid crystal molecules in the liquid crystal layer is driven through the voltage difference between the pixel electrode and the common electrode.
In some exemplary embodiments, comparing the extracted first signal with a first signal expected to be received, and determining whether or not electrostatic interference is detected according to the comparison result includes:
inputting the extracted first signal and a first signal expected to be received into a comparator, and judging that electrostatic interference is detected when the output result of the comparator indicates that the extracted first signal and the first signal expected to be received are different; when the output result of the comparator indicates that the extracted first signal is not different from the expected received first signal, it is determined that no electrostatic interference is detected.
In some exemplary embodiments, the method further comprises: the pixel driving module pre-buffers a first signal with a preset detection time interval length output by the time sequence control module under a normal condition, and takes the first signal as a first signal expected to be received. That is, the first signal that the pixel driving module expects to receive is the first signal that the timing control module normally outputs. The pixel driving module may pre-buffer one or more lines of the normally first signal, or may pre-buffer one or more frames of the normally first signal.
Taking the first signal as the data output control signal as an example, the data output control signal is a periodic signal and is also a non-differential signal, and is easily subjected to electrostatic interference. Normally, the data output control signal of each frame is the same, and the data output control signal of each line of picture is the same in the period of one frame. Therefore, a frame or a line can be taken as a measurement unit of a preset detection period. Outputting a control signal to any one or more lines of data received during one frame period, and determining that the electrostatic interference is detected if the signal is different from the data output control signal expected to be received. If the measurement unit of the preset detection period is a frame, a control signal is output to any one or more frames of received data, and if the signal is different from the expected received data output control signal, the electrostatic interference is judged to be detected.
Taking the first signal as the positive and negative frame polarity control signal as an example, the positive and negative frame polarity control signal is a periodic signal and is also a non-differential signal, and is easily subjected to electrostatic interference. Under normal conditions, the positive and negative frame polarity control signals of the odd frame pictures are the same, the positive and negative frame polarity control signals of the even frame pictures are the same, but the positive and negative frame polarity control signals of the odd frame pictures and the even frame pictures are different. The control signals of positive and negative frame polarities of each line of picture are the same in a period of one frame of picture. Therefore, a frame or a line can be taken as a measurement unit of a preset detection period. In one frame period, for any one or more rows of received positive and negative frame polarity control signals, if the signals are different from the expected received positive and negative frame polarity control signals, the electrostatic interference is judged to be detected. If the measurement unit of the preset detection period is a frame, judging that the electrostatic interference is detected if the positive and negative frame polarity control signal of any one frame of odd frame is different from the positive and negative frame polarity control signal of the expected received odd frame; for the received positive and negative frame polarity control signal of any one even frame, if the signal is different from the expected received positive and negative frame polarity control signal of the even frame, the electrostatic interference is judged to be detected; and for the positive and negative frame polarity control signals of any one frame of odd frames and one frame of even frames, if the signals are different from the expected positive and negative frame polarity control signals, judging that the electrostatic interference is detected.
In some exemplary embodiments, the method further comprises: and if the pixel driving module detects the electrostatic interference, sending a feedback signal to the time sequence control module to inform the time sequence control module to recover to output the first signal or output a correct first signal again. When the electrostatic interference occurs, the first signal output terminal of the timing control module (TCON chip) may stop outputting the first signal for protection, and in the related art, the timing control module (TCON chip) may need to be restarted to recover the output of the first signal. In the electrostatic protection method, after the pixel driving module sends the feedback signal to the timing control module, the timing control module can resume outputting the first signal to the timing control module as soon as possible. When the electrostatic interference occurs, the timing control module (TCON chip) may also continue to send the first signal to the pixel driving module, but the first signal may be varied due to the electrostatic interference, and after the pixel driving module sends the feedback signal to the timing control module, the timing control module may recover to re-output the correct first signal to the timing control module as soon as possible.
As shown in fig. 2, an embodiment of the present disclosure provides an electrostatic discharge protection apparatus, including a pixel driving module of a display panel, where the pixel driving module is configured to receive a first signal output by a timing control module and perform buffering; extracting a first signal in a preset detection time period from a cache, comparing the extracted first signal with a first signal expected to be received, and determining whether electrostatic interference is detected according to a comparison result; and if the pixel driving module detects the electrostatic interference, using the expected received first signal to replace the actually received first signal to drive the pixel unit of the display panel.
In the electrostatic protection device in the above embodiment, the pixel driving module of the display panel receives and buffers the first signal output by the timing control module, and then detects the first signal in real time, and can determine whether electrostatic interference is detected by comparing the actually received signal with the expected received signal. If the pixel driving module detects the electrostatic interference, the expected received first signal is used for replacing the actually received first signal to drive the pixel unit of the display panel, so that the pixel driving module can use the correct signal to drive the pixel unit, and the abnormal phenomena of black screen and screen flashing of the picture are avoided.
In some exemplary embodiments, the pixel driving module is configured to compare the extracted first signal with an expected received first signal in the following manner: inputting the extracted first signal and a first signal expected to be received into a comparator, and judging that electrostatic interference is detected when the output result of the comparator indicates that the extracted first signal and the first signal expected to be received are different; when the output result of the comparator indicates that the extracted first signal is not different from the expected received first signal, it is determined that no electrostatic interference is detected.
In some exemplary embodiments, the pixel driving module is further configured to pre-buffer a first signal of a preset detection period length normally output by the timing control module, and to treat the first signal as a first signal expected to be received.
In some exemplary embodiments, the pixel driving module is further configured to send a feedback signal to the timing control module to inform the timing control module to resume outputting the first signal or to re-output the correct first signal if the pixel driving module detects the electrostatic interference.
For details of other processing of the pixel driving module, reference is made to the related description of the electrostatic protection method provided in the above embodiment.
Fig. 3 shows a schematic diagram of a pixel driving module of a display panel. The pixel driving module (Source IC, source driver chip) includes an input module, a storage module, a comparator module, an output module, and a main control module.
The input module is used for receiving the first signal and the data signal output by the time sequence control module and caching the first signal and the data signal.
The storage module is used for storing a first signal expected to be received by the pixel driving module;
the comparator module is used for comparing the first signal received by the input module with the first signal expected to be received and stored by the storage module and outputting the comparison result to the main control module;
the output module is used for outputting a driving signal of the display panel under the control of the main control module;
and the main control module is used for receiving the comparison result of the comparator module and controlling the output module to output the driving signal of the display panel controlled by the actually received first signal or output the driving signal of the display panel controlled by the expected received first signal according to the comparison result.
The main control module is further used for outputting a feedback signal to the timing control module to inform the timing control module to recover to output the first signal or output a correct first signal again when the comparison result indicates that the first signal received by the input module and the first signal expected to be received and stored by the storage module are different.
Wherein the first signal comprises: a data output control signal and a positive and negative frame polarity control signal.
In a normal state (no electrostatic interference occurs), the first signal input to the input block of the pixel driving block is not different from the first signal expected to be received. In the electrostatic interference output protection period, the TCON chip is subjected to electrostatic interference, the output of a related non-differential signal (a first signal) is interrupted, at the moment, the first signal input to the input module of the pixel driving module is different from the first signal expected to be received, the pixel driving module starts backup output, and the first signal expected to be received is used for replacing the first signal actually received to drive the pixel unit of the display panel.
The embodiment of the disclosure also provides a display device comprising the electrostatic protection device.
The display device may be a Liquid Crystal (LCD) display device. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present disclosure.
Although the embodiments disclosed in the present disclosure are described above, the descriptions are only for the purpose of understanding the present disclosure, and are not intended to limit the present disclosure. It will be understood by those skilled in the art of the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure, and that the scope of the present disclosure is to be limited only by the terms of the appended claims.
Claims (8)
1. An electrostatic protection method comprises the following steps:
a pixel driving module of the display panel receives and caches a first signal output by the time sequence control module;
the pixel driving module extracts a first signal in a preset detection time period from a cache, compares the extracted first signal with a first signal expected to be received, and determines whether electrostatic interference is detected according to a comparison result;
if the pixel driving module detects the electrostatic interference, the expected received first signal is used for replacing the actually received first signal to drive the pixel unit of the display panel;
the expected received first signal is a first signal with a preset detection period length output by a timing control module buffered in advance by the pixel driving module under a normal condition.
2. The method of claim 1, wherein:
the first signal includes: a periodic signal.
3. The method of claim 2, wherein:
the first signal includes: a data output control signal and/or a positive and negative frame polarity control signal.
4. The method of claim 2, wherein:
the preset detection period includes: one or more periods of the first signal;
the period unit of the first signal includes: a line or a frame.
5. The method of any one of claims 1-4, further comprising:
and if the pixel driving module detects the electrostatic interference, sending a feedback signal to the time sequence control module to inform the time sequence control module to recover to output the first signal or output a correct first signal again.
6. The electrostatic protection device comprises a pixel driving module of a display panel, wherein the pixel driving module is configured to receive a first signal output by a time sequence control module and buffer the first signal; extracting a first signal in a preset detection time period from a cache, comparing the extracted first signal with a first signal expected to be received, and determining whether electrostatic interference is detected according to a comparison result; if the pixel driving module detects the electrostatic interference, the expected received first signal is used for replacing the actually received first signal to drive the pixel unit of the display panel; the expected received first signal is a first signal with a preset detection period length output by a timing control module buffered in advance by the pixel driving module under a normal condition.
7. The apparatus of claim 6, wherein:
the pixel driving module is further configured to send a feedback signal to the timing control module to inform the timing control module to resume outputting the first signal or to re-output the correct first signal if the pixel driving module detects the electrostatic interference.
8. A display device comprising the electrostatic protection device of any one of claims 6-7.
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| CN114255714B (en) * | 2021-12-15 | 2023-03-28 | Tcl华星光电技术有限公司 | Electrostatic protection circuit, power management chip and display terminal |
| CN114863892A (en) * | 2022-05-12 | 2022-08-05 | 海宁奕斯伟集成电路设计有限公司 | Anti-electrostatic interference device and method and screen logic board |
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