CN114694612B - Shutdown discharge circuit and shutdown discharge method - Google Patents
Shutdown discharge circuit and shutdown discharge method Download PDFInfo
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- CN114694612B CN114694612B CN202210291442.0A CN202210291442A CN114694612B CN 114694612 B CN114694612 B CN 114694612B CN 202210291442 A CN202210291442 A CN 202210291442A CN 114694612 B CN114694612 B CN 114694612B
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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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/027—Arrangements or methods related to powering off a display
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Abstract
The application relates to a shutdown discharge circuit and a shutdown discharge method, wherein the shutdown discharge circuit comprises: the voltage detection unit is used for detecting the current initial voltage difference value at the two ends of the at least one liquid crystal capacitor; the voltage judging unit is used for judging whether each initial voltage difference value exceeds a liquid crystal inversion threshold value; and the voltage adjusting unit is used for adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference to the target voltage difference when the initial voltage difference exceeds the liquid crystal inversion threshold. When the initial voltage difference exceeds the liquid crystal turning threshold, the voltage at the two ends of the liquid crystal capacitor corresponding to the initial voltage difference is adjusted to the target voltage difference, so that the voltage at the two ends of the liquid crystal capacitor in the corresponding pixel unit can not reach the turning condition, and the corresponding liquid crystal capacitor is in a discharging state, thereby keeping a black screen state under shutdown and avoiding the phenomenon of uneven display caused by turning of liquid crystal after next startup.
Description
Technical Field
The application relates to the technical field of display, in particular to a shutdown discharge circuit and a shutdown discharge method.
Background
The liquid crystal display (Liquid Crystal Display, LCD) technology has been widely used in various aspects of life by emitting light using a liquid crystal material to realize display.
In the related art, a plurality of sub-pixel units arranged in rows and columns form a sub-pixel array in the liquid crystal display panel. A thin film transistor (Thin Film Transistor, TFT) is provided in each sub-pixel unit. The plurality of scanning lines and the plurality of data lines are used for driving the sub-pixel array. For example, one scan line may be electrically connected to all the tfts in a row of sub-pixel units, respectively, for controlling the tfts of the corresponding row to be turned on or off; a data line may be electrically connected to a sub-pixel unit for writing voltage data into the sub-pixel unit, thereby driving the sub-pixel unit to be lighted.
However, after the liquid crystal display panel is turned off, since a voltage margin still remains in each sub-pixel unit, that is, the voltage in each sub-pixel unit may be in a non-zero state, the corresponding liquid crystal deflects, and the picture after the shutdown cannot be kept in a black screen state, so that the picture display after the next startup is affected.
Disclosure of Invention
In view of this, the present application provides a shutdown discharge circuit and a shutdown discharge method, which can make the voltages at two ends of the liquid crystal capacitor in the corresponding pixel unit not reach the inversion condition, and make the corresponding liquid crystal capacitor perform the discharge state, so as to maintain the black screen state under shutdown, and avoid the display non-uniformity phenomenon caused by the next turn-on liquid crystal inversion.
According to an aspect of the present application, there is provided a shutdown discharge circuit applied to a display panel including a plurality of pixel units arranged in a row-column form, each of the pixel units including a liquid crystal capacitance corresponding to the pixel unit, wherein the shutdown discharge circuit includes: the voltage detection unit is used for detecting the current initial voltage difference value at the two ends of at least one liquid crystal capacitor; the voltage judging unit is electrically connected with the voltage detecting unit and is used for judging whether the initial voltage difference value exceeds a liquid crystal inversion threshold value or not; and the voltage adjusting unit is electrically connected with the voltage judging unit and is used for adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference to a target voltage difference when the initial voltage difference exceeds the liquid crystal inversion threshold.
Further, the voltage detection unit comprises an instruction receiving unit and a voltage detection subunit, wherein the instruction receiving unit is used for receiving an externally sent shutdown instruction; the voltage detection subunit is electrically connected with the instruction receiving unit and is used for detecting the current initial voltage difference value at the two ends of at least one liquid crystal capacitor according to the shutdown instruction.
Further, the shutdown discharge circuit comprises a switch unit, the switch unit is respectively and electrically connected with the voltage detection unit and the voltage judgment unit, the switch unit comprises a plurality of switch transistors, wherein a first port of each switch transistor is electrically connected with the voltage detection unit, and a second port of each switch transistor is electrically connected with the voltage judgment unit; the third port of each of the switching transistors is electrically connected to a corresponding data line.
Further, each of the switching transistors includes a source, a drain, and a gate, wherein a first port of each of the switching transistors is the gate, a second port of each of the switching transistors is the source, and a third port of each of the switching transistors is the drain; or, the first port of each switching transistor is a gate, the second port of each switching transistor is a drain, and the third port of each switching transistor is a source.
Further, the pixel units are provided with a plurality of types, wherein the data lines corresponding to the pixel units of the same type are electrically connected to the third ports of the same switching transistor, and the data lines corresponding to the pixel units of different types are electrically connected to the third ports of different switching transistors.
Further, the pixel units in the same column are pixel units of the same type, wherein for the pixel units of the same type, the pixel units in different columns belong to different pixel unit groups, and corresponding data lines in the same pixel unit group are electrically connected to a third port of the same switching transistor.
Further, the liquid crystal turning threshold is preset, and the voltage judging unit comprises a comparator and an output unit, wherein the comparator is used for comparing the liquid crystal turning threshold with each initial voltage difference value to generate a corresponding comparison result; and the output unit is electrically connected with the comparator and is used for generating a first adjusting signal input to the voltage adjusting unit according to the comparison result.
Further, the voltage adjusting unit comprises a first voltage adjusting unit and a second voltage adjusting unit, wherein the first voltage adjusting unit is used for generating a second adjusting signal corresponding to at least one data line according to the first adjusting signal; the second voltage adjusting unit is electrically connected with the first voltage adjusting unit and is used for adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference to a target voltage difference value according to the second adjusting signal when the initial voltage difference value exceeds the liquid crystal inversion threshold value.
Further, the target voltage difference is zero or a fixed value less than the liquid crystal inversion threshold.
According to another aspect of the present application, there is provided a shutdown discharge method applied to the shutdown discharge circuit, wherein the shutdown discharge method includes: detecting the current initial voltage difference value of the two ends of at least one liquid crystal capacitor; judging whether each initial voltage difference value exceeds a liquid crystal inversion threshold value; and when the initial voltage difference exceeds the liquid crystal inversion threshold, adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference to a target voltage difference.
By detecting the current initial voltage difference value at the two ends of at least one liquid crystal capacitor, judging whether each initial voltage difference value exceeds a liquid crystal turning threshold value, and finally adjusting the voltage at the two ends of the liquid crystal capacitor corresponding to the initial voltage difference value to a target voltage difference value when the initial voltage difference value exceeds the liquid crystal turning threshold value, according to the aspects of the application, the voltage at the two ends of the liquid crystal capacitor in the corresponding pixel unit can not reach the turning condition, and the corresponding liquid crystal capacitor can be in a discharging state, so that the black screen state under the shutdown state is maintained, and the phenomenon of uneven display caused by the next turning-on of the liquid crystal is avoided.
Drawings
The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 shows a block diagram of a shutdown discharge circuit according to an embodiment of the application.
Fig. 2 shows a schematic diagram of a display panel according to an embodiment of the application.
Fig. 3 shows a schematic diagram of a pixel cell according to an embodiment of the application.
Fig. 4 shows a schematic diagram of a shutdown discharge circuit according to an embodiment of the application.
FIG. 5 is a flow chart showing a shutdown discharge method according to an embodiment of the application
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present application.
The application mainly provides a shutdown discharge circuit, which is applied to a display panel, wherein the display panel comprises a plurality of pixel units arranged in a row-column mode, each pixel unit comprises a liquid crystal capacitor corresponding to the pixel unit, and the shutdown discharge circuit comprises: the voltage detection unit is used for detecting the current initial voltage difference value at the two ends of at least one liquid crystal capacitor; the voltage judging unit is electrically connected with the voltage detecting unit and is used for judging whether the initial voltage difference value exceeds a liquid crystal inversion threshold value or not; and the voltage adjusting unit is electrically connected with the voltage judging unit and is used for adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference to a target voltage difference when the initial voltage difference exceeds the liquid crystal inversion threshold.
By detecting the current initial voltage difference value of at least one of the two ends of the liquid crystal capacitor, judging whether each initial voltage difference value exceeds a liquid crystal turning threshold value, and finally adjusting the voltage of the two ends of the liquid crystal capacitor corresponding to the initial voltage difference value to a target voltage difference value when the initial voltage difference value exceeds the liquid crystal turning threshold value, the application can lead the voltage of the two ends of the liquid crystal capacitor in the corresponding pixel unit not to reach the turning condition and lead the corresponding liquid crystal capacitor to be in a discharging state, thereby keeping the black screen state under the shutdown and avoiding the display non-uniformity phenomenon caused by the next startup liquid crystal turning.
Fig. 1 shows a block diagram of a shutdown discharge circuit according to an embodiment of the application.
As shown in fig. 1, the shutdown discharge circuit according to the embodiment of the present application may include a voltage detection unit 11, a voltage determination unit 12, and a voltage adjustment unit 13. The voltage determination unit 12 may be electrically connected to the voltage detection unit 11 and the voltage adjustment unit 13, respectively. It should be noted that the shutdown discharge circuit according to the embodiment of the present application may be applied to, for example, a display panel of a liquid crystal display. For other types of display panels, corresponding improvements can be made based on the inventive concepts of the present application, and it will be appreciated that the present application is not limited to the type of display panel and the application scenario.
Hereinafter, embodiments of the present application will be described with reference to liquid crystal display panels.
In an embodiment of the present application, the display panel may include a plurality of pixel units arranged in rows and columns to form a pixel unit array. Each pixel unit may be provided with a thin film transistor (i.e., TFT), a liquid crystal capacitor, and a storage capacitor corresponding to the pixel unit. Corresponding pixel electrodes can be further arranged in each pixel unit.
The liquid crystal display panel may be a stacked structure, and includes, for example, an array substrate, an array driving layer, a first common electrode, a liquid crystal layer, a second common electrode, a color film substrate, and the like. The first common electrode may be a common electrode disposed on the array substrate side, and the second common electrode may be a common electrode disposed on the color film substrate side. In the embodiment of the present application, the liquid crystal capacitor may be a capacitor between the corresponding pixel electrode and the second common electrode, and the storage capacitor may be a capacitor between the corresponding pixel electrode and the first common electrode.
Further, the types of the pixel units are various, such as a red pixel unit, a green pixel unit, and a blue pixel unit. The red pixel unit, the green pixel unit and the blue pixel unit may form a pixel unit group as a basic light emitting unit to emit light. It will be appreciated that the application is not limited in terms of the type of pixel cell.
Further, a plurality of scan lines and a plurality of data lines may be disposed in the display panel. Each of the scan lines may be electrically connected to the gates of all the tfts in a row of pixel units, and used for controlling the operating states of all the tfts in a corresponding row, for example, the operating states of the tfts include an on state and an off state. Each data line can be electrically connected with the drain electrode of the thin film transistor in the corresponding pixel unit respectively, and is used for writing voltage data into the pixel unit when the thin film transistor in the pixel unit is started so as to control the pixel unit to emit light, thereby realizing the display of a picture.
Fig. 2 shows a schematic diagram of a display panel according to an embodiment of the application.
As shown in fig. 2, the pixel unit 21 may be any one of the pixel units in the pixel unit array. For convenience of description, in the embodiment of the present application, the pixel unit 21 is located in the first column of pixel units from the leftmost side; starting from the uppermost side, pixel cell 21 is located in the first row of pixel cells, and so on.
In fig. 2, the scanning lines G1, G2, and G3 … sequentially control the operation states of the thin film transistors of the pixel units in each row, and the data lines D1, D2, and D3 … are electrically connected to the corresponding pixel units. In actual operation, the scan lines G1, G2, G3 and G … may be sequentially set to a high level, so that the pixel cell array may be scanned row by row.
It should be noted that the display panel in fig. 2 may be referred to as a 1G1D architecture, i.e. one scanning line controls one row of pixel units, and one data line corresponds to one pixel unit. In practical applications, the lcd panel may have other structures, such as two rows of pixel units controlled by each scan line. It will be appreciated that embodiments of the present application are not limited to a specific architecture of a display panel.
Fig. 3 shows a schematic diagram of a pixel cell according to an embodiment of the application.
As shown in fig. 3, taking the pixel unit 21 as an example, the gate of the thin film transistor T1 may be electrically connected to the scan line G1, the drain of the thin film transistor T1 may be electrically connected to the data line D1, and the source of the thin film transistor T1 may be electrically connected to one end of the liquid crystal capacitor Clc and one end of the storage capacitor Cst, respectively. One end of the liquid crystal capacitor Clc and one end of the storage capacitor Cst may be electrically connected to a corresponding pixel electrode; the other end of the liquid crystal capacitor Clc may be electrically connected to the common electrode CFCOM on the color film substrate side, and the other end of the storage capacitor Cst may be electrically connected to the common electrode ACOM on the array substrate side.
Further, the voltage detection unit comprises an instruction receiving unit and a voltage detection subunit, wherein the instruction receiving unit is used for receiving an externally sent shutdown instruction; the voltage detection subunit is electrically connected with the instruction receiving unit and is used for detecting the current initial voltage difference value at the two ends of at least one liquid crystal capacitor according to the shutdown instruction. For example, after the user presses the shutdown button of the display panel, the instruction receiving unit may receive a corresponding shutdown instruction. It will be appreciated that the application is not limited as to how the shutdown instruction is sent and received.
The voltage detection unit is used for detecting the current initial voltage difference value at two ends of at least one liquid crystal capacitor. In the actual detection, the current initial voltage difference between two ends of part of the liquid crystal capacitors can be detected, and the current initial voltage difference between two ends of all the liquid crystal capacitors can also be detected.
Since the types of the pixel units are various, the corresponding liquid crystal capacitances in the pixel units of different types may also be different. In addition, the size of the liquid crystal capacitance may also be affected by other factors. The influence factors of the liquid crystal capacitance are comprehensively considered, and the current initial voltage difference value at the two ends of the liquid crystal capacitance can be detected according to the type of the pixel unit.
Further, the shutdown discharge circuit comprises a switch unit, the switch unit is respectively and electrically connected with the voltage detection unit and the voltage judgment unit, the switch unit comprises a plurality of switch transistors, wherein a first port of each switch transistor is electrically connected with the voltage detection unit, and a second port of each switch transistor is electrically connected with the voltage judgment unit; the third port of each of the switching transistors is electrically connected to a corresponding data line.
Fig. 4 shows a schematic diagram of a shutdown discharge circuit according to an embodiment of the application.
As shown in fig. 4, the switching unit may include a first switching transistor T41, a second switching transistor T42, and a third switching transistor T43. In fig. 4, the first column of pixel units from the left may be red pixel units, the second column of pixel units may be green pixel units, the third column of pixel units may be blue pixel units, the fourth column of pixel units may be red pixel units, and so on.
Further, each of the switching transistors includes a source, a drain, and a gate, wherein a first port of each of the switching transistors is the gate, a second port of each of the switching transistors is the source, and a third port of each of the switching transistors is the drain; or, the first port of each switching transistor is a gate, the second port of each switching transistor is a drain, and the third port of each switching transistor is a source. It is understood that the type of the thin film transistor in the pixel unit may be N-type or P-type in addition to the switching transistor, and the present application is not limited to the type of the switching transistor or the thin film transistor.
Further, the pixel units are provided with a plurality of types, wherein the data lines corresponding to the pixel units of the same type are electrically connected to the third ports of the same switching transistor, and the data lines corresponding to the pixel units of different types are electrically connected to the third ports of different switching transistors. For example, in fig. 4, the first column of pixel units and the fourth column of pixel units may be red pixel units, and the data lines corresponding to the pixel units in the two columns of pixel units may be electrically connected to the third port of the first switching transistor T41.
Further, the pixel units in the same column are pixel units of the same type, wherein for the pixel units of the same type, the pixel units in different columns belong to different pixel unit groups, and corresponding data lines in the same pixel unit group are electrically connected to a third port of the same switching transistor. For example, the 1 st, 4 th, 7 th and 10 … th columns of pixel units may be red pixel units, where the 1 st column of red pixel units and the 4 th column of red pixel units may form a first pixel unit group, the 7 th column of red pixel units and the 10 th column of red pixel units may form a second pixel unit group, and the first pixel unit group and the second pixel unit group may be electrically connected to different switching transistors, so that the switching units may be capable of more finely adjusting voltages at both ends of the liquid crystal capacitor in the corresponding pixel units. It will be appreciated that the application is not limited as to how the individual pixel cells are divided.
Further, the liquid crystal turning threshold is preset, and the voltage judging unit comprises a comparator and an output unit, wherein the comparator is used for comparing the liquid crystal turning threshold with each initial voltage difference value to generate a corresponding comparison result; and the output unit is electrically connected with the comparator and is used for generating a first adjusting signal input to the voltage adjusting unit according to the comparison result.
Wherein the comparison result may include a first comparison result and a second comparison result. The first comparison result may include that the initial voltage difference exceeds the liquid crystal inversion threshold, and the second comparison result may include that the initial voltage difference does not exceed the liquid crystal inversion threshold. For example, for the first comparison result, the first adjustment signal generated by the output unit may be a high level; for the second comparison result, the first adjustment signal generated by the output unit may be a low level.
Further, the voltage adjusting unit comprises a first voltage adjusting unit and a second voltage adjusting unit, wherein the first voltage adjusting unit is used for generating a second adjusting signal corresponding to at least one data line according to the first adjusting signal; the second voltage adjusting unit is electrically connected with the first voltage adjusting unit and is used for adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference to a target voltage difference value according to the second adjusting signal when the initial voltage difference value exceeds the liquid crystal inversion threshold value.
Wherein the target voltage difference is zero or a fixed value less than the liquid crystal inversion threshold. Preferably, the target voltage difference is zero, that is, the potentials at two ends of the corresponding liquid crystal capacitor are equal, and no voltage difference exists.
Further, the second adjustment signal may be a feedback voltage input into the corresponding data line. For example, at the moment of shutdown, the initial voltage difference may be +0.2v, that is, the potential on the side of the corresponding pixel unit where the liquid crystal capacitor is connected to the thin film transistor is 0.2V higher than the potential on the CFCOM side. At this time, a feedback voltage of-0.2V can be input to the data line corresponding to the pixel unit, so that the potential on the side, connected with the thin film transistor, of the liquid crystal capacitor in the pixel unit is equal to the potential on the side of the CFCOM, and further the corresponding liquid crystal cannot meet the turning-over condition, enter a discharge state, keep a black screen state of shutdown, and avoid influencing the display of the next startup.
The second adjusting unit may be a driving chip which is additionally arranged. After the shutdown discharge circuit detects that the discharge is finished, the switch unit can be turned off, and writing of the feedback voltage to the corresponding data line is stopped.
In addition, the application also provides a shutdown discharge method which can be applied to the shutdown discharge circuit.
Fig. 5 shows a flowchart of a shutdown discharge method according to an embodiment of the application.
As shown in fig. 5, the shutdown discharge method includes:
step S1: detecting the current initial voltage difference value of the two ends of at least one liquid crystal capacitor;
further, detecting a current initial voltage difference across at least one of the lc capacitors includes:
step S11: receiving an externally sent shutdown instruction;
step S12: and detecting the current initial voltage difference value at the two ends of at least one liquid crystal capacitor according to the shutdown instruction.
Step S2: judging whether each initial voltage difference value exceeds a liquid crystal inversion threshold value;
further, determining whether each of the initial voltage differences exceeds a liquid crystal inversion threshold includes:
step S21: comparing the liquid crystal turning threshold value with each initial voltage difference value to generate a corresponding comparison result;
step S22: and generating a first adjusting signal input to the voltage adjusting unit according to the comparison result.
Step S3: and when the initial voltage difference exceeds the liquid crystal inversion threshold, adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference to a target voltage difference.
Further, when the initial voltage difference exceeds the liquid crystal inversion threshold, adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference to a target voltage difference, including:
step S31: generating a second adjustment signal corresponding to at least one data line according to the first adjustment signal;
step S32: and when the initial voltage difference exceeds the liquid crystal inversion threshold value according to the second adjusting signal, adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference to a target voltage difference.
It should be noted that, for each step of the embodiment of the present application, various modifications may be made according to actual situations. For detailed portions of each step in the embodiments of the present application, reference may be made to the detailed description of the shutdown discharge circuit in the present application, and no further description is given.
In summary, in the embodiment of the application, by detecting the current initial voltage difference value at two ends of at least one liquid crystal capacitor, then judging whether each initial voltage difference value exceeds a liquid crystal inversion threshold value, and finally adjusting the voltages at two ends of the liquid crystal capacitor corresponding to the initial voltage difference value to a target voltage difference value when the initial voltage difference value exceeds the liquid crystal inversion threshold value, the voltages at two ends of the liquid crystal capacitor in the corresponding pixel unit can not reach the inversion condition, and the corresponding liquid crystal capacitor is in a discharge state, so that the black screen state under shutdown is maintained, and the phenomenon of uneven display caused by the next turn-on liquid crystal inversion is avoided.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The shutdown discharge circuit and the shutdown discharge method provided by the embodiment of the present application are described in detail, and specific examples are applied to illustrate the principle and the implementation of the present application, and the description of the above embodiments is only used to help understand the technical scheme and the core idea of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (9)
1. A shutdown discharge circuit, wherein the shutdown discharge circuit is applied to a display panel, the display panel comprises a plurality of pixel units arranged in rows and columns, each pixel unit comprises a liquid crystal capacitor corresponding to the pixel unit, and the shutdown discharge circuit comprises:
the voltage detection unit is used for detecting the current initial voltage difference value at the two ends of at least one liquid crystal capacitor;
the voltage judging unit is electrically connected with the voltage detecting unit and is used for judging whether the initial voltage difference value exceeds a liquid crystal inversion threshold value or not;
and the voltage adjusting unit is electrically connected with the voltage judging unit and is used for adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference value to a target voltage difference value when the initial voltage difference value exceeds the liquid crystal inversion threshold value so as to prevent the liquid crystal from being turned over, wherein the target voltage difference value is zero.
2. The shutdown discharge circuit of claim 1 wherein the voltage detection unit comprises a command receiving unit and a voltage detection subunit, wherein,
the instruction receiving unit is used for receiving an externally sent shutdown instruction;
the voltage detection subunit is electrically connected with the instruction receiving unit and is used for detecting the current initial voltage difference value at the two ends of at least one liquid crystal capacitor according to the shutdown instruction.
3. The shutdown discharge circuit according to claim 1, wherein the shutdown discharge circuit includes a switching unit electrically connected to the voltage detection unit and the voltage determination unit, respectively, the switching unit including a plurality of switching transistors, wherein,
the first port of each switching transistor is electrically connected with the voltage detection unit, and the second port of each switching transistor is electrically connected with the voltage judgment unit; the third port of each of the switching transistors is electrically connected to a corresponding data line.
4. A shutdown discharge circuit as defined in claim 3 wherein each of said switching transistors includes a source, a drain and a gate, wherein,
the first port of each switching transistor is a grid electrode, the second port of each switching transistor is a source electrode, and the third port of each switching transistor is a drain electrode;
or, the first port of each switching transistor is a gate, the second port of each switching transistor is a drain, and the third port of each switching transistor is a source.
5. The shutdown discharge circuit of claim 4, wherein the types of the pixel units are provided in plural, wherein the data lines corresponding to the pixel units of the same type are electrically connected to the third port of the same switching transistor, and the data lines corresponding to the pixel units of different types are electrically connected to the third ports of different switching transistors.
6. The shutdown discharge circuit of claim 5, wherein the pixel cells in the same column are of the same type, wherein for the same type of pixel cells, the pixel cells in different columns belong to different pixel cell groups, and corresponding data lines in the same pixel cell group are electrically connected to the third port of the same switching transistor.
7. The power-off discharge circuit according to claim 6, wherein the liquid crystal inversion threshold is set in advance, the voltage judging unit includes a comparator and an output unit, wherein,
the comparator is used for comparing the liquid crystal inversion threshold value with each initial voltage difference value to generate a corresponding comparison result;
and the output unit is electrically connected with the comparator and is used for generating a first adjusting signal input to the voltage adjusting unit according to the comparison result.
8. The shutdown discharge circuit of claim 7 wherein the voltage adjustment unit comprises a first voltage adjustment unit and a second voltage adjustment unit, wherein,
a first voltage adjusting unit for generating a second adjusting signal corresponding to at least one data line according to the first adjusting signal;
the second voltage adjusting unit is electrically connected with the first voltage adjusting unit and is used for adjusting the voltage at two ends of the liquid crystal capacitor corresponding to the initial voltage difference to a target voltage difference value according to the second adjusting signal when the initial voltage difference value exceeds the liquid crystal inversion threshold value.
9. A shutdown discharge method, wherein the shutdown discharge method is applied to the shutdown discharge circuit as claimed in any one of claims 1 to 8, and wherein the shutdown discharge method comprises:
detecting the current initial voltage difference value of the two ends of at least one liquid crystal capacitor;
judging whether each initial voltage difference value exceeds a liquid crystal inversion threshold value;
and when the initial voltage difference exceeds the liquid crystal inversion threshold, adjusting the voltage at two ends of a liquid crystal capacitor corresponding to the initial voltage difference to a target voltage difference so that liquid crystal is not inverted, wherein the target voltage difference is zero.
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