CN107526225B - Discharging method and device of liquid crystal panel - Google Patents
Discharging method and device of liquid crystal panel Download PDFInfo
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- CN107526225B CN107526225B CN201710913526.2A CN201710913526A CN107526225B CN 107526225 B CN107526225 B CN 107526225B CN 201710913526 A CN201710913526 A CN 201710913526A CN 107526225 B CN107526225 B CN 107526225B
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- 238000007599 discharging Methods 0.000 title claims abstract description 66
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010409 thin film Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 10
- 239000000758 substrate Substances 0.000 description 8
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- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136204—Arrangements to prevent high voltage or static electricity failures
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
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Abstract
In an embodiment of the present invention, a discharge method for a liquid crystal panel is provided, where a pixel array of the liquid crystal panel includes S rows of pixel units, where S is an integer greater than 1, and the discharge method includes: acquiring the charge quantity stored by pixel electrodes of pixel units in Q rows of a pixel array, wherein Q is an integer which is greater than 1 and less than or equal to S; dividing the Q rows of pixel units into N discharge paths according to the charge quantity stored by the pixel electrodes in the Q rows of pixel units, wherein the discharge current passing through any one of the N discharge paths is less than or equal to a discharge current threshold value; and opening the N discharge paths, and releasing the charges stored in the pixel electrodes of the Q rows of pixel units to an external circuit. The embodiment of the invention also provides a discharging device. The embodiment of the invention is beneficial to solving the problem that the abnormal condition is caused by the fact that the large current passes through the external circuit instantly in the shutdown discharge process of the liquid crystal panel, and the dependence of the liquid crystal panel is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a discharging method and a discharging device of a liquid crystal panel.
Background
In the current information society, Thin Film Transistor liquid crystal displays (TFT LCDs) have been widely used in various aspects of life, including small-sized mobile phones, video cameras, digital cameras, medium-sized notebook computers, desktop computers, large-sized household televisions, large-sized projection equipment, and the like, and have the advantages of being light, Thin, environment-friendly, high-performance, and the like.
In the pixel array of the TFT-LCD shown in fig. 1, each pixel unit has a TFT, a gate (gate) is connected to a scan line (gate line) in a horizontal direction, a drain (drain) is connected to a data line (dataline) in a vertical direction, and a source (source) is connected to a pixel electrode.
When the size of the TFT-LCD is made larger and the resolution is made higher, more and more charges are accumulated in the TFT-LCD. However, when the input voltage drops to the predetermined threshold voltage during shutdown, all the gate lines are pulled up to the turn-on voltage in the prior art, and the data lines serve as a discharge path for discharging the charges stored in the pixel electrodes to the external circuit. However, the amount of charge released instantaneously is too large, which causes an instantaneous large current to pass through an external circuit, thereby causing an abnormality.
Disclosure of Invention
The invention aims to provide a discharging method and a discharging device of a liquid crystal panel, which are beneficial to solving the problem that the abnormal condition is caused by the fact that a large current passes through an external circuit instantly in the shutdown discharging process of the liquid crystal panel, and the dependence of the liquid crystal panel is improved.
In a first aspect, an embodiment of the present invention provides a discharging method for a liquid crystal panel, where a pixel array of the liquid crystal panel includes S rows of pixel units, where S is an integer greater than 1, and the method includes:
acquiring the charge quantity stored by pixel electrodes of pixel units in Q rows of the pixel array, wherein Q is an integer which is greater than 1 and less than or equal to S;
dividing the Q rows of pixel units into N discharge paths according to the charge quantity stored by the pixel electrodes of the Q rows of pixel units, wherein N is an integer greater than 1, and the discharge current passing through any one of the N discharge paths is less than or equal to a discharge current threshold value;
and opening the N discharge paths, and releasing the charges stored in the pixel electrodes of the Q rows of pixel units to an external circuit.
In one possible embodiment, the liquid crystal panel includes a scan line, and the obtaining of the amount of charge stored in the pixel electrodes of the pixel units in the Q rows of the pixel array includes:
and when the Q is equal to the S and the scanning line inputs scanning signals for the Q-th row of pixel units of the pixel array, calculating the charge quantity stored by the pixel electrodes of each row of the Q-row of pixel units.
In one possible embodiment, the liquid crystal panel includes a scan line, and the obtaining of the amount of charge stored in the pixel electrodes of the pixel units in the Q rows of the pixel array includes:
when the Q is smaller than the S and the scanning line inputs scanning signals for the jth row of pixel units of the Q row of pixel units, calculating the charge quantity stored by the pixel electrodes of the jth row of pixel units;
and acquiring the charge quantity stored by the pixel electrodes of the Q rows of pixel units.
In one possible embodiment, the dividing the Q rows of pixel units into N discharge paths by rows according to the amount of charge stored in the pixel electrodes of the Q rows of pixel units includes:
calculating the current generated when the charge quantity stored by the pixel electrodes in the Q rows of pixel units is released to the external circuit according to the charge quantity stored by each row of pixel electrodes in the Q rows of pixel units;
and dividing the Q rows of pixel units into N discharge paths according to the current generated when the charge quantity stored in the pixel electrodes in each row of pixel units is released to the external circuit.
In a possible embodiment, the calculating, according to the amount of charge stored in each row of pixel electrodes in the Q rows of pixel units, a current generated when the amount of charge stored in the pixel electrodes in the row of pixel units is released to the external circuit includes:
acquiring a discharge time length, wherein the initial time of the discharge time length is the time of opening a discharge path P, and the end time of the discharge time length is the time of finishing the release of charges stored in a pixel electrode in a pixel unit included in the discharge path P;
and calculating the current generated when the charge quantity stored by the pixel electrodes in the pixel units of each row of the Q rows of the pixel units is released to the external circuit according to the charge quantity stored by the pixel electrodes in the pixel units of each row of the Q rows of the pixel units and the discharge time length.
In a possible embodiment, any one of the N discharge paths includes M rows of pixel units, where the M rows of pixel units are consecutive M rows of pixel units of the pixel array, or the M rows of pixel units are non-consecutive M rows of pixel units of the pixel array.
In one possible embodiment, any one of the N discharge paths includes the M rows of pixel cells, and a sum of currents generated when the charge amount stored in the pixel electrodes of the M rows of pixel cells is discharged to the external circuit is less than or equal to the discharge current threshold.
In a second aspect, an embodiment of the present invention provides a discharge device, where the discharge device is used for the liquid crystal panel, and the liquid crystal panel further includes a scan line, a data line, and a pixel array, and includes:
the scanning line and the data line are respectively and electrically connected with the pixel array, and the discharge devices are respectively and electrically connected with the scanning line and the data line;
the discharge device is used to perform the method in any of the possible embodiments described above.
In one possible embodiment, the discharge device is a control chip or a discharge circuit.
In a third aspect, an embodiment of the present invention provides a liquid crystal display device, including a liquid crystal panel and any one of the above discharge devices, where the liquid crystal panel is electrically connected to the discharge device.
It can be seen that, in the solution of the embodiment of the present invention, the discharging device obtains the amount of charges stored in the pixel electrodes of the pixel units in the S row of the pixel array; the discharging device divides the S-row pixel units into N discharging paths according to the charge quantity stored by the pixel electrodes of the S-row pixel units, wherein N is an integer greater than 1, and the discharging current passing through any one of the N discharging paths is smaller than or equal to a discharging current threshold value; the discharging device opens the N discharging paths and discharges the charges stored in the pixel electrodes of the S rows of pixel units to an external circuit. . Compared with the prior art, the charge stored in the pixel electrode in the pixel array is released to the external circuit through the divided discharging path, so that the current passing through the external circuit is smaller than the maximum current capable of being borne by the external circuit, the problem that the instant large current passes through the external circuit in the shutdown discharging process of the liquid crystal panel and causes abnormity is solved, and the dependence of the liquid crystal panel is improved.
Drawings
To more clearly illustrate the structural features and effects of the present invention, a detailed description is given below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view of a liquid crystal panel according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a discharging method of a liquid crystal panel according to an embodiment of the present invention;
fig. 3a is a schematic view of a liquid crystal panel according to an embodiment of the invention;
FIG. 3b is a schematic view of another liquid crystal panel according to an embodiment of the invention;
FIG. 3c is a schematic view of another liquid crystal panel according to an embodiment of the invention;
FIG. 4 is a schematic view of another liquid crystal panel according to an embodiment of the present invention;
fig. 5a is a schematic diagram illustrating discharge path division of a liquid crystal panel according to an embodiment of the present invention;
fig. 5b is a schematic diagram illustrating discharge path division of another liquid crystal panel according to an embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The drawings are for illustrative purposes only and are merely schematic representations, not intended to limit the present patent.
Referring to fig. 1, a schematic diagram of a liquid crystal panel according to an embodiment of the invention is shown. The liquid crystal panel comprises an array substrate, a color film substrate and a liquid crystal layer. The array substrate and the color film substrate are opposite and arranged in parallel at intervals, and the liquid crystal layer is positioned between the array substrate and the color film substrate. One surface of the color film substrate facing the liquid crystal layer is laminated with a common electrode layer, the common electrode layer comprises a plurality of common electrode areas which are arranged in an array mode, and the common electrode areas are connected with one another. The array substrate comprises a plurality of spaced and parallel data lines, a plurality of spaced and parallel scanning lines and a plurality of thin film transistors arranged in an array. The scanning lines are vertical to the data lines and are insulated from each other.
The data lines and the scanning lines are arranged on different layers, and the data lines and the scanning lines are insulated through insulating layers. In the embodiment of the invention, the plurality of scanning lines are horizontally arranged and are arranged at intervals along the vertical direction, and the plurality of data lines are vertically arranged and are arranged at intervals along the horizontal direction.
For convenience of description, the scanning lines (Gate lines, GL) are numbered, wherein the scanning lines are named as a first scanning Line GL (1), a second scanning Line GL (2), …, an nth scanning Line GL (n), …, and a pth scanning Line GL (p) in order from top to bottom, respectively, wherein n is a positive integer, p is a positive integer, and p is greater than n, wherein p is the number of the plurality of scanning lines. Likewise, Data Lines (DL) are numbered, wherein the Data lines are named a first Data Line DL (1), a second Data Line DL (2), …, an mth Data Line DL (m), …, and a qth Data Line DL (q) in order from left to right, respectively, wherein m is a positive integer, q is a positive integer, and q is greater than m, wherein q is the number of the plurality of Data lines 10.
Two adjacent scanning lines and two adjacent data lines define a pixel region, so that a plurality of scanning lines and a plurality of data lines define a plurality of pixel regions arranged in an array, and each pixel region is opposite to one common electrode region. A thin film transistor is arranged in each pixel area, and the thin film transistors arranged in the pixel areas are arranged in an array to form a matrix.
The thin film transistor comprises a source electrode, a drain electrode, a grid electrode and a pixel electrode. The source electrode is connected with the pixel electrode of the thin film transistor, the grid electrode is connected with a scanning line, and the drain electrode is connected with a data line. In the embodiment of the present invention, the gate of the tft in the nth row and the mth column is connected to the nth scan line gl (n), and the drain thereof is connected to the mth data line dl (m). The thin film transistor may be any one of an amorphous silicon thin film transistor, a low temperature polycrystalline thin film transistor, a high temperature polycrystalline thin film transistor, or an oxide semiconductor thin film transistor. Wherein n and m are both natural numbers larger than zero.
When the liquid crystal panel is driven to display images, starting voltage is input to the scanning lines, the thin film transistors connected with the scanning lines are started, the source electrodes and the drain electrodes of the thin film transistors are conducted, positive polarity voltage or negative polarity voltage is charged into the thin film transistors connected with the data lines through the data lines, namely the pixel electrodes of the thin film transistors are charged to the maximum potential value of the positive polarity 14V through the data lines and the conducted source electrodes and drain electrodes of the thin film transistors or the pixel electrodes are discharged to the data lines to the minimum potential value of the negative polarity 0V, and therefore positive polarity voltage difference or negative polarity voltage difference is generated at two ends of liquid crystals in pixels corresponding to the thin film transistors, namely the pixels are in positive polarity potential or negative polarity potential.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a discharging method of a liquid crystal panel according to an embodiment of the invention. As shown in fig. 2, the method is applied to the liquid crystal panel shown in fig. 1, a pixel array of the liquid crystal panel comprises S rows of pixel units, and the method comprises:
s201, the discharging device acquires the charge quantity stored by the pixel electrodes of the pixel units in the Q rows of the pixel array.
Wherein Q is an integer of 1 or more and S or less.
The liquid crystal panel comprises a scanning line, and the acquiring of the charge amount stored by the pixel electrodes of the pixel units in the Q rows of the pixel array comprises the following steps:
and when the Q is equal to the S and the scanning line inputs scanning signals for the Q-th row of pixel units of the pixel array, acquiring the charge quantity stored by the pixel electrodes of the Q-row of pixel units.
Specifically, the discharge device obtains the charge amount stored in the pixel electrodes of the Q rows of pixel units in non-real time. After the scanning line inputs scanning signals for the Q-row pixel units, namely the scanning line inputs scanning signals for the Q-th row of pixel units, the discharging device respectively calculates the charge amount stored in the pixel electrodes of the pixel units in each row of the Q-row of pixel units so as to obtain the charge amount stored in the pixel electrodes of the pixel units in the Q-row.
In a possible embodiment, when the discharge device receives a shutdown command when the scan line inputs a scan signal for the pixel units in the ith row of the pixel units in the Q rows, the scan line continues to input a scan signal for the pixel units in each row after the ith row. When the scanning line is used for inputting scanning signals to the Q-th row of pixel units of the pixel array, namely the scanning line is used for inputting scanning signals to the Q-th row of pixel units, the discharging device starts to calculate the charge quantity stored in the pixel electrodes of each row of pixel units of the Q-row of pixel units respectively so as to obtain the charge quantity stored in the pixel electrodes of the Q-row of pixel units.
The pixel cells in the i-th row are any row of the pixel cells in the S-row.
The discharge device calculates the amount of charges stored in the pixel electrodes of each row of pixel units, specifically, the amount of charges stored in the pixel electrodes of the row of pixel units is obtained by adding up the amounts of charges stored in each pixel electrode of the row of pixel units.
Specifically, the discharge device obtains the amount of charge stored in the pixel electrode by calculation according to a voltage value V input by the data line and a capacitance value C of a capacitor charging the pixel electrode, where the amount of charge Q stored in the pixel electrode is obtained by calculation, and the calculation formula is Q ═ V × C.
It should be noted that the scan line inputs a scan signal for each row of the pixel units in the pixel array, i.e. when the TFT of each pixel unit in the pixel array is turned on, the data line charges the pixel electrode, so that the pixel electrode is charged.
For example, referring to fig. 3a and 3b, fig. 3a provides a schematic diagram of a pixel array according to an embodiment of the present invention, and fig. 3b provides another schematic diagram of a pixel array according to an embodiment of the present invention. For convenience of representation, a rectangle is a pixel unit in the figure. The gray rectangles indicate pixel cells to which the scan lines input the overscan signals, and the white rectangles indicate pixel cells to which the scan lines do not input the overscan signals. As shown in fig. 3a, at this time, the scanning line only inputs the overscan signal to the pixel units in the first row to the third row in the pixel array, and the scanning signal is not input to the pixel units in the fourth row and the fifth row, and at this time, the discharging device does not obtain the charge amount stored in the pixel electrodes in each row of the pixel array. As shown in fig. 3b, after the scanning line inputs the scanning signal for the pixel units in 5 rows in the pixel array, that is, the scanning line inputs the scanning signal for the pixel units in the frame, at this time, the discharging device respectively obtains the charge amount stored in the pixel electrodes in each row of the pixel units in the pixel array, so as to obtain the charge amount stored in the pixel electrodes of the pixel units in 5 rows.
The liquid crystal panel comprises a scanning line, and the acquiring of the charge amount stored by the pixel electrodes of the pixel units in the Q rows of the pixel array comprises the following steps:
when the Q is smaller than the S and the scanning line is used for inputting scanning signals to the pixel units in the jth row of the pixel units in the Q row, calculating the charge amount stored by the pixel electrodes of the pixel units in the jth row, wherein the pixel units in the jth row are any row in the pixel units in the Q row;
and acquiring the charge quantity stored by the pixel electrodes of the Q rows of pixel units.
Specifically, when a scan line inputs a scan signal to the jth row of pixel cells of the pixel array to charge the pixel electrodes of the jth row of pixel cells, that is, when the scan line finishes inputting the scan signal to the jth row of pixel cells, the discharge device immediately calculates the amount of charge stored in the pixel electrodes of the jth row of pixel cells. The j-th row of pixel units is any row of S-row of pixel units of the pixel array. When the scanning line is the input scanning signal of the pixel unit in the Q-th row of the pixel array, the discharging device receives a shutdown command, and the scanning line is no longer the input scanning signal of the pixel unit behind the Q-th row. The above-described discharge device calculates the amount of charge stored in the pixel electrodes of the pixel cells in the Q-th row.
According to the method, after the scanning line inputs the scanning signal for the Q rows of pixel units, the discharging device can acquire the charge amount stored in the pixel electrodes of the Q rows of pixel units.
In other words, the discharge device obtains the amount of charge stored in the pixel electrode of each row of pixel units of the pixel array in real time.
For example, referring to fig. 3c, fig. 3c is a schematic diagram of an array according to an embodiment of the present invention. For convenience of representation, a rectangle is a pixel unit in the figure. The gray rectangles represent pixel cells for which the scan lines input overscan signals. The white rectangles represent pixel units to which no overscan signal is input to the scanning lines of the frame. As shown in fig. 3c, the pixel array includes 5 rows of pixel cells. Inputting scanning signals into a first row of pixel units with scanning lines as a pixel array so as to charge pixel electrodes of the first row of pixel units by using data lines, and calculating the charge quantity stored in the pixel electrodes in the first row of pixel units by using the discharging device; after the scanning signal is input into the second row of pixel units with the scanning line as the pixel array so that the data line charges the pixel electrodes of the second row of pixel units, the discharging device calculates the charge quantity stored in the pixel electrodes of the second row of pixel units. The discharge device calculates the charge quantity stored by the pixel electrodes in each row of pixel units of the pixel array in real time. After the scanning line inputs scanning signals for the second row of pixel units, the discharging device receives a shutdown instruction, and the scanning line stops inputting signals for the third, fourth and fifth row of pixel units. The discharge device acquires the charge quantity stored by the pixel electrodes in the first row and the second row of pixel units.
In a possible embodiment, after the scan line inputs a scan signal to the pixel units in the Q-th row and the discharging device obtains the charge amount stored in the pixel electrodes of the pixel units in the Q-th row, the discharging device receives a shutdown instruction, the scan line stops inputting the scan signal to the pixel units in the S-Q rows following the pixel units in the Q-th row, and the discharging device obtains the charge amount stored in the pixel electrodes of the pixel units in the S-Q rows following the pixel units in the Q-th row to obtain the charge amount stored in the pixel electrodes of the pixel units in the S rows. And the charge quantity stored by the pixel electrodes of the pixel units in the S-Q rows after the pixel unit in the Q-th row is the charge quantity stored by the pixel unit in the previous frame.
In other words, the discharge device calculates the amount of charge stored in the pixel electrodes of each row of the pixel units of the pixel array in real time.
For example, referring to fig. 3c, fig. 3c is a schematic diagram of an array according to an embodiment of the present invention. For convenience of representation, a rectangle is a pixel unit in the figure. The gray rectangles represent pixel cells for which the scan lines input overscan signals. The white rectangles represent pixel units to which no overscan signal is input to the scanning lines of the frame. As shown in fig. 3c, the pixel array includes 5 rows of pixel cells. Inputting scanning signals into a first row of pixel units with scanning lines as a pixel array so as to charge pixel electrodes of the first row of pixel units by using data lines, and calculating the charge quantity stored in the pixel electrodes in the first row of pixel units by using the discharging device; after the scanning signal is input into the second row of pixel units with the scanning line as the pixel array so that the data line charges the pixel electrodes of the second row of pixel units, the discharging device calculates the charge quantity stored in the pixel electrodes of the second row of pixel units. The discharge device calculates the charge quantity stored by the pixel electrodes in each row of pixel units of the pixel array in real time. After the scanning line inputs scanning signals for the second row of pixel units, the discharging device receives a shutdown instruction, and the scanning line stops inputting signals for the third, fourth and fifth row of pixel units. The discharge device acquires the charge quantity stored by the pixel electrodes of the third, fourth and fifth rows of pixel units so as to obtain the charge quantity stored by the pixel electrodes of the 5 rows of pixel units. The charge quantity stored by the pixel electrodes in the pixel units of the third, fourth and fifth rows is the charge quantity stored by the pixel electrodes in the pixel units of which the scanning signals are input by the scanning lines of the previous frame.
It should be noted that the scan line inputs a scan signal to the pixel unit, specifically, inputs a start voltage to the TFT in the pixel unit, so that the data line charges the pixel electrode in the pixel unit.
S202, the discharging device divides the Q rows of pixel units into N discharging paths according to the charge quantity stored in the pixel electrodes of the Q rows of pixel units, wherein N is an integer larger than 1, and the discharging current passing through any one of the N discharging paths is smaller than or equal to a discharging current threshold value.
Wherein the dividing the S rows of pixel units into N discharge paths by rows according to the amount of charge stored by the pixel electrodes of the Q rows of pixel units comprises:
acquiring current generated when the charge amount stored by the pixel electrodes in each row of the pixel units is released to the external circuit according to the charge amount stored by each row of the pixel electrodes in the Q rows of the pixel units;
and dividing the Q rows of pixel units into N discharge paths according to the current generated when the charge quantity stored in the pixel electrodes in each row of pixel units is released to the external circuit.
The obtaining of the current generated when the charge amount stored in the pixel electrodes in each row of the pixel units is released to the external circuit according to the charge amount stored in each row of the pixel electrodes in the Q row of the pixel units includes:
acquiring a discharge time length, wherein the initial time of the discharge time length is the time of opening a discharge path P, and the end time of the discharge time length is the time of finishing the release of charges stored in a pixel electrode in a pixel unit included in the discharge path P;
and acquiring current generated when the charge quantity stored by the pixel electrodes in the pixel units of each row of the Q rows of the pixel units is released to the external circuit according to the charge quantity stored by the pixel electrodes in the pixel units of each row of the Q rows of the pixel units and the discharge time.
Specifically, after the electric charge amount of the pixel electrode in each pixel unit of the ith row in the Q-row pixel array is acquired by the discharging device, the electric charge amount stored by the pixel electrode in each pixel unit of the ith row in the Q-row pixel array is added to obtain the electric charge amount stored by the pixel electrode of the ith row of pixel units. And then acquiring the current generated on the external circuit when the charge quantity stored by the pixel electrodes in the pixel units in the ith row is released to the external circuit according to the charge quantity stored by the pixel electrodes in the pixel units in the ith row and the discharge time length of the charge quantity released to the external circuit.
According to the method, the discharging device can acquire the circuit generated on the external circuit when the charge quantity stored in the pixel electrode of each row of the Q rows of the pixel units is released to the external circuit.
And then dividing the pixel array into N discharge paths according to the current generated when the charge quantity stored by the pixel electrode of each pixel unit in the Q rows of pixel units passes through an external circuit. The current of any one of the N discharging paths is smaller than or equal to the discharging current threshold value.
Furthermore, any one of the N discharge paths is configured to release an amount of charge stored in pixel electrodes of M rows of pixel units in the pixel array, where M is an integer greater than 0 and smaller than Q. The M rows of pixel cells may be consecutive rows of the pixel array, or may be non-consecutive rows.
For example, referring to fig. 4, fig. 4 is a schematic diagram of a pixel array according to an embodiment of the present invention. As shown in fig. 4, the pixel array includes m × n pixel units. The discharge device obtains the charge quantity stored by the pixel electrode in each pixel unit of the s-th row of the pixel array, and the charge quantity is respectively Qs1, Qs2, Qs3, Qs4, …, Qst, …, Qs (m-1) and Qsm. The discharge device adds the charge quantity stored by the pixel electrode in each pixel unit of the s-th row of the pixel array: qs is Qs1+ Qs2+ Qs3+ Qs4+ … + Qst + … + Qs (m-1) + Qsm. And obtaining the charge quantity Qs stored in the pixel electrodes of the pixel units in the s-th row. According to the method, the charge quantity stored by the pixel electrode of each row of pixel units in the pixel array can be acquired, and the charge quantity is respectively Q1, Q2, …, Qs, …, Q (n-1) and Qn.
The discharge device calculates the current (I1, I2, …, Is, …, I (n-1) and In) generated when the charge quantity stored In the pixel electrodes of each row of pixel units Is released to an external circuit according to the charge quantity (Q1, Q2, …, Qs, …, Q (n-1) and Qn) stored In the pixel electrodes of each row of pixel units In the pixel array and the time for releasing the charge quantity to the external circuit. The calculation formula of the current is as follows: Is-Qs/ts. Wherein ts Is a time period during which the charge amount Qs stored in the pixel electrode of the pixel unit in the s-th row in the pixel array Is released to the external circuit, i.e., the discharge time period, and Is a current generated when the charge amount Qs stored in the pixel electrode of the pixel unit in the s-th row in the pixel array Is released to the external circuit.
The discharge device divides the N rows of pixel cells of the pixel array into N discharge paths according to currents (I1, I2, …, Is, …, I (N-1), In) generated when the charge amount stored In the pixel electrodes of each row of pixel cells of the pixel array Is discharged to an external circuit.
See, for further example, fig. 5a and 5 b. Fig. 5a is a schematic diagram illustrating discharge path division of a liquid crystal panel according to an embodiment of the present invention, and fig. 5b is a schematic diagram illustrating discharge path division of another liquid crystal panel according to an embodiment of the present invention. Assuming that the discharge current threshold is Imax, as shown in fig. 5a, the pixel array includes 6 rows of pixel units, and the currents generated when the charge amount stored in the pixel electrodes of each row of pixel units is discharged to an external circuit are Ia1, Ia2, Ia3, Ia4, Ia5 and Ia6, respectively. The discharge device divides the pixel unit of the pixel array into 3 discharge paths (a first discharge path, a second discharge path, and a third discharge path). Wherein the first discharge path includes a first row of pixel cells of the pixel array, and Ia1 is less than or equal to Imax; the second discharge path includes a second row of pixel cells, a third row of pixel cells, and a fourth row of pixel cells of the pixel array, wherein a sum of Ia2, Ia3, Ia4 is less than or equal to Imax; the third discharge path includes the fifth and sixth rows of pixel cells of the pixel array described above, where the sum of Ia5 and Ia6 is less than or equal to Imax. As shown in fig. 5b, the pixel array includes 6 rows of pixel units, and currents respectively generated when the charge amount stored in the pixel electrodes of each row of pixel units is released to an external circuit are Ib1, Ib2, Ib3, Ib4, Ib5 and Ib 6. The discharge device divides the pixel unit of the pixel array into 2 discharge paths (a first discharge path and a second discharge path). The first discharge path comprises a first row of pixel cells and a fourth row of pixel cells of the pixel array, and the sum of Ia1 and Ia4 is less than or equal to Imax; the second discharge path includes pixel cells in a second row, pixel cells in a third row, pixel cells in a fifth row, and pixel cells in a sixth row of the pixel array, and a sum of Ib2, Ib3, Ib5, and Ib6 is less than or equal to Imax.
It should be noted that the M rows of pixel units can be understood as any M rows of pixel units in the pixel array.
S203, the discharging device opens the N discharging paths and discharges the charges stored in the pixel electrodes of the Q rows of pixel units to an external circuit.
Specifically, after the discharging device opens the discharging path P1, when the amount of charges stored in the pixel electrode of the pixel unit included in the discharging path is released to the external circuit, the discharging device opens the discharging path P2 again until the N discharging paths are opened, and all the charges stored in the pixel electrode of the pixel unit of the pixel array are released to the external circuit. The discharge path P1 is any one of the N discharge paths, the discharge path P2 is any one of the N discharge paths except for the discharge path P1, and the opening order of the discharge path P1 and the path P2 has no obvious precedence relationship. In other words, the discharge device opens only one of the N discharge paths at a time, and after all the charges stored in the pixel electrodes of the pixel units included in the discharge path opened this time are released to the circuit, the discharge device opens another discharge path until all the N discharge paths are opened, and all the charges stored in the pixel electrodes of the pixel units of the pixel array are released to the external circuit.
It should be noted that, the discharge device turns on the discharge path, specifically, the discharge device controls the scan line to apply a positive voltage to the gate of the TFT in the pixel unit included in the discharge path, and turns on the TFT, so that the charges stored in the pixel electrode connected to the source of the TFT in the pixel unit included in the discharge path are discharged to the external circuit through the drain of the TFT and the data line.
It can be seen that, in the solution of the embodiment of the present invention, the discharge device obtains the amount of charge stored by the pixel electrodes of the pixel units in the Q rows of the pixel array in two ways: one is that after the scanning signal is input to all the pixel units of the pixel array by the scanning line, the electric discharge device calculates the electric charge amount stored in the pixel electrode of each row of the pixel units of the pixel array to obtain the electric charge amount stored in the pixel electrode of the pixel unit of the Q row; the other is that after the scanning signal is input into any row of pixel units of the pixel array by the scanning line, the discharge device calculates the charge amount stored in the pixel electrodes of the pixel units in the row in real time to obtain the charge amount stored in the pixel electrodes of the pixel units in the Q row; the discharging device divides the Q rows of pixel units into N discharging paths according to the charge quantity stored by the pixel electrodes of the Q rows of pixel units, wherein N is an integer greater than 1, and the discharging current passing through any one of the N discharging paths is smaller than or equal to a discharging current threshold value; the discharging device opens the N discharging paths and discharges the charges stored in the pixel electrodes of the Q rows of pixel units to an external circuit. Compared with the prior art, the discharge device can monitor the charge quantity of the pixel array in the liquid crystal panel. When the shutdown action is carried out, the circuit adopting the first mode forcibly finishes the refreshing of the frame picture and then carries out the shutdown operation, and the circuit adopting the second mode can immediately carry out the shutdown operation; the charges stored in the pixel electrodes in the pixel array are released to the external circuit through the divided discharging paths, so that the current passing through the external circuit is smaller than the maximum current capable of being borne by the external circuit, the problem that the abnormal condition is caused because the instantaneous large current passes through the external circuit in the shutdown discharging process of the liquid crystal panel is solved, and the dependence of the liquid crystal panel is improved.
The embodiment of the present invention further provides a driving device for a liquid crystal panel, which is applied to the liquid crystal panel, where the liquid crystal panel includes a scan line, a data line, and a pixel array, and includes:
the driving device is electrically connected with the scanning line and the data line respectively, and the scanning line and the data line are electrically connected with the pixel array;
the driving device is used for executing the discharging method.
The embodiment of the invention also provides a liquid crystal display device which comprises a liquid crystal display device body and the liquid crystal panel, wherein the liquid crystal panel is electrically connected with the driving device.
The foregoing is directed to the preferred embodiment of the present invention, and it is understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.
Claims (8)
1. A discharging method of a liquid crystal panel is characterized in that a pixel array of the liquid crystal panel comprises S rows of pixel units, wherein S is an integer greater than 1, and the method comprises the following steps:
the liquid crystal panel comprises a scanning line, wherein after a scanning signal is input to a jth row of pixel units of Q rows of pixel units of the pixel array through the scanning line, the charge amount stored by pixel electrodes of the jth row of pixel units is calculated, the jth row of pixel units is any row of the Q rows of pixel units, the charge amount stored by the pixel electrodes of each row of the Q rows of pixel units of the pixel array is acquired, and Q is an integer which is greater than 1 and smaller than S;
dividing the Q rows of pixel units into N discharge paths according to the charge quantity stored by the pixel electrodes of the Q rows of pixel units, wherein N is an integer greater than 1, and the discharge current passing through any one of the N discharge paths is less than or equal to a discharge current threshold value;
after the charge amount stored in the pixel electrodes of the pixel units included in the discharge path P1 from any one discharge path P1 to the discharge path P1 is completely released to the circuit, another arbitrary discharge path P2 is opened until the N discharge paths are all opened, and the charges stored in the pixel electrodes of the pixel units in the Q rows are released to an external circuit.
2. The method of claim 1, wherein dividing the Q rows of pixel cells into N discharge paths by row according to the amount of charge stored by the pixel electrodes of the Q rows of pixel cells comprises:
calculating the current generated when the charge quantity stored by the pixel electrodes in the Q rows of pixel units is released to the external circuit according to the charge quantity stored by each row of pixel electrodes in the Q rows of pixel units;
and dividing the Q rows of pixel units into N discharge paths according to the current generated when the charge quantity stored in the pixel electrodes in each row of pixel units is released to the external circuit.
3. The method of claim 2, wherein calculating the current generated when the amount of charge stored in the pixel electrodes of the Q rows of pixel cells is released to the external circuit according to the amount of charge stored in each row of pixel electrodes of the Q rows of pixel cells comprises:
acquiring a discharge time length, wherein the initial time of the discharge time length is the time of opening a discharge path P, and the end time of the discharge time length is the time of finishing the release of charges stored in a pixel electrode in a pixel unit included in the discharge path P;
and calculating the current generated when the charge quantity stored by the pixel electrodes in the pixel units of each row of the Q rows of the pixel units is released to the external circuit according to the charge quantity stored by the pixel electrodes in the pixel units of each row of the Q rows of the pixel units and the discharge time length.
4. The method of claim 1 or 2, wherein any one of the N discharge paths comprises M rows of pixel cells, the M rows of pixel cells being consecutive M rows of pixel cells of the pixel array, or the M rows of pixel cells being non-consecutive M rows of pixel cells of the pixel array.
5. The method of claim 1, wherein any one of the N discharge paths comprises M rows of pixel cells, and a sum of currents generated when an amount of charge stored in pixel electrodes of the M rows of pixel cells is discharged to the external circuit is less than or equal to the discharge current threshold.
6. A discharge device for the liquid crystal panel, the liquid crystal panel further including a scanning line, a data line, and a pixel array, comprising:
the scanning line and the data line are respectively and electrically connected with the pixel array, and the discharge devices are respectively and electrically connected with the scanning line and the data line;
the discharge device is used for carrying out the method according to any one of claims 1 to 5.
7. The discharge device of claim 6, wherein the discharge device is a control chip or a discharge circuit.
8. A liquid crystal display device comprising a liquid crystal panel and the discharge device according to any one of claims 6 or 7, wherein the liquid crystal panel is electrically connected to the discharge device.
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| TW201035958A (en) * | 2009-03-31 | 2010-10-01 | Chi Mei Optoelectronics Corp | Driving apparatus and method for eliminating afterimage of LCD at power off |
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