CN107422558B - Liquid crystal panel and driving method thereof - Google Patents
Liquid crystal panel and driving method thereof Download PDFInfo
- Publication number
- CN107422558B CN107422558B CN201710734264.3A CN201710734264A CN107422558B CN 107422558 B CN107422558 B CN 107422558B CN 201710734264 A CN201710734264 A CN 201710734264A CN 107422558 B CN107422558 B CN 107422558B
- Authority
- CN
- China
- Prior art keywords
- pixels
- voltage
- pixel
- thin film
- scanning line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000010409 thin film Substances 0.000 claims abstract description 114
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 14
- 239000000758 substrate Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- G02F1/13624—Active matrix addressed cells having more than one switching element per pixel
-
- 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
- G09G3/3614—Control of polarity reversal in general
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Nonlinear Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a liquid crystal panel, which specifically comprises the following components: in each row of pixels, the grids of the first thin film transistors of all the first pixels are connected to a corresponding first scanning line, and the grids of the second thin film transistors of all the second pixels are connected to a corresponding second scanning line; in each column of pixels, the drain electrodes (or the source electrodes) of the first thin film transistors of all the first pixels are connected to a corresponding one of the first data lines, and the drain electrodes (or the source electrodes) of the second thin film transistors of all the second pixels are connected to a corresponding one of the second data lines; and adjusting the grid voltage transmitted by the first scanning line and/or the second scanning line so that the source grid voltage (or drain grid voltage) of the first thin film transistor is the same as the source grid voltage (or drain grid voltage) of the second thin film transistor. The invention also provides a driving method of the liquid crystal panel. When the liquid crystal panel displays, the leakage currents of all the thin film transistors are the same, so that abnormal display phenomena cannot be caused.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to a liquid crystal panel and a driving method thereof.
Background
With the development of the photoelectric and semiconductor technologies, the development of Flat Panel displays (Flat Panel displays) is also increased, and among many Flat Panel displays, Liquid Crystal Displays (LCDs) have become the mainstream of the market due to their excellent characteristics, such as high space utilization efficiency, low power consumption, no radiation, and low electromagnetic interference.
The lcd generally includes a Liquid Crystal Panel (Liquid Crystal Panel) and a backlight Module (backlight Module, BL). Since the lcd panel itself does not have the self-luminous property, the backlight module must be disposed under the lcd panel to provide uniform surface light required by the lcd panel, so that the lcd panel can display images by the surface light provided by the backlight module.
The liquid crystal panel includes a plurality of pixels, a plurality of scan lines, and a plurality of data lines, each pixel including a Thin Film Transistor (TFT) having a gate electrode (gate) connected to the scan line extending in a horizontal direction, a drain electrode (drain) connected to the extended data line extending in a vertical direction, and a pixel electrode having a source electrode (source) connected to the pixel electrode.
The liquid crystal panel is usually driven by polarity Inversion, such as dot Inversion (DotInversion) and Column Inversion (Column Inversion).
When the liquid crystal panel is driven to display a certain picture in a polarity inversion mode, the high voltage duration and the low voltage duration of the data voltage supplied to the pixel electrode by the data line through the thin film transistor are respectively half. In the duration time of the high voltage, the voltage range of a source electrode and a drain electrode of the thin film transistor is usually 7-14V, the low voltage provided by the scanning line to a grid electrode of the thin film transistor is usually-5V, and the voltage range of a source-grid voltage Vgs + of the thin film transistor is 12-19V at the moment; and in the low voltage duration, the voltage range of the source electrode and the drain electrode of the thin film transistor is usually 0-7V, the low voltage provided by the scanning line to the grid electrode of the thin film transistor is usually-5V, and the voltage range of the source electrode voltage Vgs-of the thin film transistor is 5-12V at the moment. Thus, it can be seen that the voltage ranges of the source-gate voltages Vgs +, Vgs-of the thin film transistors are different for the high voltage duration and the low voltage duration, which will result in a leakage current I of the thin film transistoroffAnd thus, display abnormality is caused due to a difference in actual voltages supplied to the pixel electrodes by the thin film transistors when driving a display screen.
Disclosure of Invention
In order to solve the problems of the prior art, an object of the present invention is to provide a liquid crystal panel, a driving method thereof, and a liquid crystal display, in which the source and gate voltages of all tfts are the same during the time when the liquid crystal panel displays a frame.
According to an aspect of the present invention, there is provided a liquid crystal panel including a plurality of pixels, a plurality of first scan lines, a plurality of second scan lines, a plurality of first data lines, and a plurality of second data lines, the plurality of pixels being arranged in an array, the pixels including thin film transistors and pixel electrodes connected to source electrodes of the thin film transistors; in each row of pixels, the grids of the first thin film transistors of all the first pixels are connected to a corresponding first scanning line, and the grids of the second thin film transistors of all the second pixels are connected to a corresponding second scanning line; in each column of pixels, the drains of the first thin film transistors of all the first pixels are connected to a corresponding first data line, and the drains of the second thin film transistors of all the second pixels are connected to a corresponding second data line; wherein the polarities of the pixel voltages of the first pixel electrode of the first pixel and the second pixel electrode of the second pixel are opposite; in displaying a frame, adjusting the gate voltage transmitted by the first scanning line and/or the second scanning line to make the source-gate voltage of the first thin film transistor and the source-gate voltage of the second thin film transistor the same.
Further, in displaying a frame, when a first data line connected to the first pixel supplies a high data voltage to the first pixel so that the first pixel electrode has a pixel voltage of positive polarity, adjusting to pull up a low voltage of the gate voltages transmitted by the first scan line; and/or when a second data line connected with the second pixel supplies a low data voltage to the second pixel so that the second pixel electrode has a pixel voltage with a negative polarity, adjusting and reducing a low voltage in the grid voltage transmitted by the second scanning line.
Further, in each row of pixels, the first pixels and the second pixels are alternately arranged, and in each column of pixels, the first pixels or the second pixels are all arranged; or, in each row of pixels, the first pixels and the second pixels are alternately arranged; in each column of pixels, the first pixels and the second pixels are alternately arranged; the pixels adjacent to the first pixel in the vertical direction and the left-right direction are the second pixels.
According to another aspect of the present invention, there is also provided a driving method of a liquid crystal panel, the driving method including: in displaying a frame picture, adjusting the grid voltage transmitted by the first scanning line and/or the second scanning line so as to enable the source grid voltage of the first thin film transistor to be the same as the source grid voltage of the second thin film transistor; the gates of the first thin film transistors of all the first pixels in each row of pixels of the liquid crystal panel are connected to a corresponding first scanning line, the gates of the second thin film transistors of all the second pixels in each row of pixels of the liquid crystal panel are connected to a corresponding second scanning line, the drains of the first thin film transistors of all the first pixels in each column of pixels of the liquid crystal panel are connected to a corresponding first data line, the drains of the second thin film transistors of all the second pixels in each column of pixels of the liquid crystal panel are connected to a corresponding second data line, and the polarities of the pixel voltages of the first pixel electrodes of the first pixels and the second pixel electrodes of the second pixels are opposite.
Further, the method for adjusting the gate voltage transmitted by the first scanning line and/or the second scanning line comprises the following steps: in displaying a frame, when a first data line connected with the first pixel provides a high data voltage to the first pixel, adjusting to pull up a low voltage in a grid voltage transmitted by the first scanning line; and/or adjusting to pull down a low voltage of the gate voltages transmitted by the second scan lines when the second data lines connected to the second pixels provide the low data voltages to the second pixels.
According to still another aspect of the present invention, there is provided a liquid crystal panel including a plurality of pixels, a plurality of first scan lines, a plurality of second scan lines, a plurality of first data lines, and a plurality of second data lines, the plurality of pixels being arranged in an array, the pixels including thin film transistors and pixel electrodes connected to drain electrodes of the thin film transistors; in each row of pixels, the grids of the first thin film transistors of all the first pixels are connected to a corresponding first scanning line, and the grids of the second thin film transistors of all the second pixels are connected to a corresponding second scanning line; in each column of pixels, the source electrodes of the first thin film transistors of all the first pixels are connected to a corresponding first data line, and the source electrodes of the second thin film transistors of all the second pixels are connected to a corresponding second data line; wherein the polarities of the pixel voltages of the first pixel electrode of the first pixel and the second pixel electrode of the second pixel are opposite; in displaying a frame, adjusting the gate voltage transmitted by the first scanning line and/or the second scanning line to make the drain-gate voltage of the first thin film transistor the same as the drain-gate voltage of the second thin film transistor.
Further, in displaying a frame, when a first data line connected to the first pixel supplies a high data voltage to the first pixel so that the first pixel electrode has a pixel voltage of positive polarity, adjusting to pull up a low voltage of the gate voltages transmitted by the first scan line; and/or when a second data line connected with the second pixel supplies a low data voltage to the second pixel so that the second pixel electrode has a pixel voltage with a negative polarity, adjusting and reducing a low voltage in the grid voltage transmitted by the second scanning line.
Further, in each row of pixels, the first pixels and the second pixels are alternately arranged, and in each column of pixels, the first pixels or the second pixels are all arranged; or, in each row of pixels, the first pixels and the second pixels are alternately arranged; in each column of pixels, the first pixels and the second pixels are alternately arranged; the pixels adjacent to the first pixel in the vertical direction and the left-right direction are the second pixels.
According to still another aspect of the present invention, there is provided a driving method of a liquid crystal panel, the driving method including: in displaying a frame of picture, adjusting the grid voltage transmitted by the first scanning line and/or the second scanning line so as to enable the drain-grid voltage of the first thin film transistor to be the same as the drain-grid voltage of the second thin film transistor; the gates of the first thin film transistors of all the first pixels in each row of pixels of the liquid crystal panel are connected to a corresponding first scanning line, the gates of the second thin film transistors of all the second pixels in each row of pixels of the liquid crystal panel are connected to a corresponding second scanning line, the sources of the first thin film transistors of all the first pixels in each column of pixels of the liquid crystal panel are connected to a corresponding first data line, the sources of the second thin film transistors of all the second pixels in each column of pixels of the liquid crystal panel are connected to a corresponding second data line, and the polarities of the pixel voltages of the first pixel electrodes of the first pixels and the second pixel electrodes of the second pixels are opposite.
Further, the method for adjusting the gate voltage transmitted by the first scanning line and/or the second scanning line comprises the following steps: in displaying a frame, when a first data line connected with the first pixel provides a high data voltage to the first pixel, adjusting to pull up a low voltage in a grid voltage transmitted by the first scanning line; and/or adjusting to pull down a low voltage of the gate voltages transmitted by the second scan lines when the second data lines connected to the second pixels provide the low data voltages to the second pixels.
According to another aspect of the present invention, there is provided a liquid crystal display, which includes a backlight module and the liquid crystal panel, wherein the backlight module and the liquid crystal panel are disposed opposite to each other, and the backlight module provides display light to the liquid crystal panel.
The invention has the beneficial effects that: in the time when the liquid crystal panel displays a frame of picture, the leakage currents of all the thin film transistors in the liquid crystal panel are the same, so that the pixel voltages provided by the thin film transistors to the corresponding pixel electrodes are the same when the display picture is driven, and the abnormal display phenomenon cannot be caused.
Drawings
The above and other aspects, features and advantages of embodiments of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural view of a liquid crystal panel according to an embodiment of the present invention;
fig. 2 is a waveform diagram of a gate voltage transferred to a gate of a thin film transistor by a scan line according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of a gate voltage transferred to a gate of a thin film transistor by a scan line according to another embodiment of the present invention;
fig. 4 is a waveform diagram of a gate voltage transferred to a gate of a thin film transistor by a scan line according to still another embodiment of the present invention;
fig. 5 is a structural diagram of a liquid crystal display according to an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to explain the principles of the invention and its practical application to thereby enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated.
In the drawings, like reference numerals will be used to refer to like elements throughout. It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.
Fig. 1 is a schematic structural view of a liquid crystal panel according to an embodiment of the present invention.
Referring to fig. 1, a liquid crystal panel according to an embodiment of the present invention includes: the liquid crystal display device includes a substrate 100, a plurality of pixels formed on the substrate 100, a plurality of first scan lines 210, a plurality of second scan lines 220, a plurality of first data lines 310, and a plurality of second data lines 320. It should be noted that the liquid crystal panel according to the embodiment of the present invention may further include a scan driver (not shown) connecting the first scan line 210 and the second scan line 220, a data driver (not shown) connecting the first data line 310 and the second data line 320, a timing controller (not shown) controlling the scan driver and the data driver, and the like.
In this embodiment, the pixels are divided into first pixels and second pixels according to the difference in polarity of the pixel voltages stored at the same time. In fig. 1, the polarity of the pixel voltage stored in the first pixel and the polarity of the pixel voltage stored in the second pixel at the same time are different, and "P +" represents the first pixel and "P-" represents the second pixel, where P + represents that the pixel voltage stored in the first pixel at this time is a positive polarity pixel voltage, and P-represents that the pixel voltage stored in the second pixel at this time is a positive polarity pixel voltage, but the invention is not limited thereto. In addition, the liquid crystal panel shown here at the same time displays the duration of one frame, but the present invention is not limited thereto.
It should be noted that the pixel voltage mentioned herein refers to a voltage difference obtained by subtracting the common voltage from a voltage loaded on the pixel electrode through the data line, and when the pixel voltage stored in the first pixel is a positive-polarity pixel voltage, the voltage difference obtained by subtracting the common voltage from the voltage loaded on the pixel electrode in the first pixel is positive, that is, the voltage loaded on the pixel electrode in the first pixel is greater than the common voltage; when the pixel voltage stored in the first pixel is a negative pixel voltage, the voltage difference between the voltage loaded on the pixel electrode in the first pixel and the common voltage is negative, and at this time, the voltage loaded on the pixel electrode in the first pixel is less than the common voltage.
The pixel includes a thin film transistor and a pixel electrode connected to a source electrode of the thin film transistor. In the present embodiment, the first pixel includes the first thin film transistor T1 and the first pixel electrode LC1 connected to the source S (or the drain D) of the first thin film transistor T1, and the second pixel includes the second thin film transistor T2 and the second pixel electrode LC2 connected to the source S (or the drain D) of the second thin film transistor T2, but the present invention is not limited thereto.
In the present embodiment, in each row of pixels, the first pixel and the second pixel are included, but the present invention is not limited thereto.
In the present embodiment, a plurality of pixels are arrayed. Each of the first scan lines 210 and each of the second scan lines 220 extends in a row direction (i.e., a horizontal direction), and each of the first data lines 310 and each of the second data lines 320 extends in a column direction (i.e., a vertical direction). In each row of pixels, the gates G of the first thin film transistors T1 of all the first pixels are connected to a corresponding one of the first scan lines 210, and the gates G of the second thin film transistors T2 of all the second pixels are connected to a corresponding one of the second scan lines 220; in each column of pixels, the drains D (or sources S) of the first tfts T1 of all the first pixels are connected to a corresponding one of the first data lines 310, and the drains D (or sources S) of the second tfts T2 of all the second pixels are connected to a corresponding one of the second data lines 320.
In this embodiment, the liquid crystal panel according to the embodiment of the present invention drives display in a polarity inversion manner of column inversion, in which case, for each row of pixels, the first pixels and the second pixels are alternately arranged, and for each column of pixels, the pixels are all the same type, that is, the pixels are all the first pixels or the pixels are all the second pixels, but the present invention is not limited thereto.
As another embodiment of the present invention, the liquid crystal panel according to the embodiment of the present invention drives display in a dot inversion polarity inversion method, in which the first pixels and the second pixels are alternately arranged for each row of pixels, and the first pixels and the second pixels are alternately arranged for each column of pixels, and the pixels adjacent to the first pixels in the vertical direction and the horizontal direction are both the second pixels, and the pixels adjacent to the second pixels in the vertical direction and the horizontal direction are both the first pixels, but the present invention is not limited thereto.
In the liquid crystal panel according to the embodiment of the invention, the gate voltage transmitted by the first scan line 210 and/or the second scan line 220 is adjusted so that the source-gate voltage Vgs1 (or the drain-gate voltage Vgd1) of the first thin film transistor T1 and the source-gate voltage Vgs2 (or the drain-gate voltage Vgd2) of the second thin film transistor T2 are the same in one frame. In this way, since the source-gate voltage Vgs1 (or the drain-gate voltage Vgd1) of the first thin film transistor T1 and the source-gate voltage Vgs2 (or the drain-gate voltage Vgd2) of the second thin film transistor T2 are the same, the leakage current I of all the thin film transistors (including all the first thin film transistors T1 and all the second thin film transistors T2) in the liquid crystal panel is caused to be the sameoffAnd the actual voltages provided by the thin film transistors to the corresponding pixel electrodes are the same when the display picture is driven, so that abnormal display phenomena cannot be caused.
The following describes how to adjust the gate voltage transmitted by the first scan line 210 and/or the second scan line 220 in one frame displayed by the lcd panel according to an embodiment of the present invention.
Fig. 2 is a waveform diagram of a gate voltage transferred to a gate of a thin film transistor by a scan line according to an embodiment of the present invention.
Referring to fig. 1 and 2, the left graph is a waveform diagram of the gate voltage VG1 transferred by the first scan line 210, and the right graph is a waveform diagram of the gate voltage VG2 transferred by the second scan line 220. When the first data line 310 connected to the first pixel supplies the high data voltage to the drain D (or the source S) of the first thin film transistor T1 of the first pixel such that the first pixel electrode LC1 of the first pixel has the pixel voltage of the positive polarity (which is equal to the high data voltage minus the common voltage Vcom) during the time when the liquid crystal panel displays one frame of picture, the low voltage L of the gate voltages transmitted by the first scan line 210 is pulled up; and when the second data line 320 connected to the second pixel supplies the low data voltage to the drain electrode D (or the source electrode S) of the second thin film transistor T2 of the second pixel such that the second pixel electrode LC2 of the second pixel has the pixel voltage of negative polarity, which is equal to the low data voltage minus the common voltage Vcom, the low voltage L of the gate voltages transferred by the second scan line 220 is not changed.
Thus, during the high data voltage duration, for example, the voltage range of the source S and the drain D of the first tft T1 is 7-14V, the low voltage provided by the first scan line 210 to the gate G of the first tft T1 is pulled up to 2V, and the voltage range of the source-gate voltage Vgs1 (or the drain-gate voltage Vgd1) of the first tft T1 is 5-12V. During the low data voltage duration, for example, the voltage range of the source S and the drain D of the second tft T2 is 0 to 7V, the low voltage provided by the second scan line 220 to the gate G of the second tft T2 is still-5V, and the voltage range of the source-gate voltage Vgs2 (or the drain-gate voltage Vgd2) of the second tft T2 is 5 to 12V. In this way, the source-gate voltage Vgs1 of the first thin film transistor T1 and the source-gate voltage Vgs2 (or the drain-gate voltage Vgd2) of the second thin film transistor T2 can be made the same.
Fig. 3 is a waveform diagram of a gate voltage transferred to a gate of a thin film transistor by a scan line according to another embodiment of the present invention.
Referring to fig. 1 and 3, the left graph is a waveform diagram of the gate voltage VG1 transferred by the first scan line 210, and the right graph is a waveform diagram of the gate voltage VG2 transferred by the second scan line 220. When the first data line 310 connected to the first pixel supplies the high data voltage to the drain electrode D of the first thin film transistor T1 of the first pixel such that the first pixel electrode LC1 of the first pixel has the pixel voltage of the positive polarity (which is equal to the high data voltage minus the common voltage Vcom) during the time when the liquid crystal panel displays one frame of picture, the low voltage L of the gate voltages transmitted by the first scan line 210 is not changed; and when the second data line 320 connected to the second pixel supplies the low data voltage to the drain electrode D of the second thin film transistor T2 of the second pixel so that the second pixel electrode LC2 of the second pixel has the pixel voltage of negative polarity (which is equal to the low data voltage minus the common voltage Vcom), the low voltage L of the gate voltages transmitted by the second scan line 220 is pulled down.
Thus, during the high data voltage duration, for example, the voltage range of the source S and the drain D of the first tft T1 is 7-14V, the low voltage provided by the first scan line 210 to the gate G of the first tft T1 is still-5V, and the voltage range of the source-gate voltage Vgs1 (or the drain-gate voltage Vgd1) of the first tft T1 is 12-19V. During the low data voltage duration, for example, the voltage range of the source S and the drain D of the second tft T2 is 0-7V, the low voltage provided by the second scan line 220 to the gate G of the second tft T2 is pulled down to-12V, and the voltage range of the source-gate voltage Vgs2 (or the drain-gate voltage Vgd2) of the second tft T2 is 12-19V. In this way, the source-gate voltage Vgs1 (or the drain-gate voltage Vgd1) of the first thin film transistor T1 and the source-gate voltage Vgs2 (or the drain-gate voltage Vgd2) of the second thin film transistor T2 can be made the same.
Fig. 4 is a waveform diagram of a gate voltage transferred to a gate of a thin film transistor by a scan line according to still another embodiment of the present invention.
Referring to fig. 1 and 4, the left graph is a waveform diagram of the gate voltage VG1 transferred by the first scan line 210, and the right graph is a waveform diagram of the gate voltage VG2 transferred by the second scan line 220. When the first data line 310 connected to the first pixel supplies the high data voltage to the drain D (or the source S) of the first thin film transistor T1 of the first pixel such that the first pixel electrode LC1 of the first pixel has the pixel voltage of the positive polarity (which is equal to the high data voltage minus the common voltage Vcom) during the time when the liquid crystal panel displays one frame of picture, the low voltage L of the gate voltages transmitted by the first scan line 210 is pulled up; and adjusts the low voltage L of the gate voltages transmitted by the pull-down second scan lines 220 when the second data line 320 connected to the second pixel supplies the low data voltage to the drain electrode D (or the source electrode S) of the second thin film transistor T2 of the second pixel such that the second pixel electrode LC2 of the second pixel has the pixel voltage of negative polarity, which is equal to the low data voltage minus the common voltage Vcom.
Thus, during the high data voltage duration, for example, the voltage range of the source S and the drain D of the first tft T1 is 7-14V, the low voltage provided by the first scan line 210 to the gate G of the first tft T1 is-2V, and the voltage range of the source-gate voltage Vgs1 (or the drain-gate voltage Vgd1) of the first tft T1 is 9-16V. During the low data voltage duration, for example, the voltage range of the source S and the drain D of the second tft T2 is 0-7V, the low voltage provided by the second scan line 220 to the gate G of the second tft T2 is pulled down to-9V, and the voltage range of the source-gate voltage Vgs2 (or the drain-gate voltage Vgd2) of the second tft T2 is 9-16V. In this way, the source-gate voltage Vgs1 of the first thin film transistor T1 and the source-gate voltage Vgs2 (or the drain-gate voltage Vgd2) of the second thin film transistor T2 can be made the same.
In addition, it should be noted that, in each embodiment of the present invention, the source and the drain of each thin film transistor may be interchanged, that is, the connection manner of the source and the drain of each thin film transistor may be interchanged, so that the source gate voltage is changed to the drain gate voltage after the interchange, but the present invention is not limited thereto.
Fig. 5 is a structural diagram of a liquid crystal display according to an embodiment of the present invention.
Referring to fig. 5, the lcd according to the embodiment of the invention generally includes an lcd panel 1000 and a backlight module 2000, wherein the lcd panel 1000 is the lcd panel shown in fig. 1. The backlight module 2000 is disposed under the liquid crystal panel 1000 to provide uniform surface light required by the liquid crystal panel 1000, so that the liquid crystal panel 1000 can display images by the surface light provided by the backlight module 2000.
In summary, according to the embodiments of the invention, in the time when the liquid crystal panel displays one frame of picture, the leakage currents of all the thin film transistors in the liquid crystal panel are the same, so that the pixel voltages provided by the thin film transistors to the corresponding pixel electrodes are the same when the display picture is driven, and thus the abnormal display phenomenon is not caused.
While the invention has been shown and described with reference to certain embodiments, those skilled in the art will understand that: various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (10)
1. The liquid crystal panel is characterized by comprising a plurality of pixels, a plurality of first scanning lines, a plurality of second scanning lines, a plurality of first data lines and a plurality of second data lines, wherein the pixels are arranged in an array mode and comprise thin film transistors and pixel electrodes connected with source electrodes of the thin film transistors;
in each row of pixels, the grids of the first thin film transistors of all the first pixels are connected to a corresponding first scanning line, and the grids of the second thin film transistors of all the second pixels are connected to a corresponding second scanning line;
in each column of pixels, the drains of the first thin film transistors of all the first pixels are connected to a corresponding first data line, and the drains of the second thin film transistors of all the second pixels are connected to a corresponding second data line; wherein the polarities of the pixel voltages of the first pixel electrode of the first pixel and the second pixel electrode of the second pixel are opposite;
in displaying a frame, a high voltage in the gate voltages transmitted by the first scanning line and a high voltage in the gate voltages transmitted by the second scanning line are made equal, and a source-gate voltage of the first thin film transistor and a source-gate voltage of the second thin film transistor are made the same by adjusting a low voltage in the gate voltages transmitted by the first scanning line and/or a low voltage in the gate voltages transmitted by the second scanning line.
2. The liquid crystal panel according to claim 1, wherein in displaying one frame, when the first data line connected to the first pixel supplies the high data voltage to the first pixel so that the first pixel electrode has a pixel voltage of positive polarity, the low voltage of the gate voltages transmitted by the first scan line is pulled up; and/or when a second data line connected with the second pixel supplies a low data voltage to the second pixel so that the second pixel electrode has a pixel voltage with a negative polarity, adjusting and reducing a low voltage in the grid voltage transmitted by the second scanning line.
3. The liquid crystal panel according to claim 1 or 2, wherein the first pixels and the second pixels are alternately arranged in each row of pixels, and in each column of pixels, either the first pixels or the second pixels; or, in each row of pixels, the first pixels and the second pixels are alternately arranged; in each column of pixels, the first pixels and the second pixels are alternately arranged; the pixels adjacent to the first pixel in the vertical direction and the left-right direction are the second pixels.
4. The driving method of the liquid crystal panel is characterized in that the grid electrodes of the first thin film transistors of all the first pixels in each row of pixels of the liquid crystal panel are connected to a corresponding first scanning line, the grid electrodes of the second thin film transistors of all the second pixels in each row of pixels of the liquid crystal panel are connected to a corresponding second scanning line, the drain electrodes of the first thin film transistors of all the first pixels in each column of pixels of the liquid crystal panel are connected to a corresponding first data line, the drain electrodes of the second thin film transistors of all the second pixels in each column of pixels of the liquid crystal panel are connected to a corresponding second data line, and the polarities of the pixel voltages of the first pixel electrodes of the first pixels and the second pixel electrodes of the second pixels are opposite;
wherein the driving method comprises: and in displaying a frame picture, making a high voltage in the gate voltages transmitted by the first scanning line equal to a high voltage in the gate voltages transmitted by the second scanning line, and adjusting a low voltage in the gate voltages transmitted by the first scanning line and/or a low voltage in the gate voltages transmitted by the second scanning line so as to make the source-gate voltage of the first thin film transistor equal to the source-gate voltage of the second thin film transistor.
5. The driving method according to claim 4, wherein the method of adjusting the low voltage of the gate voltage transmitted by the first scan line and/or the low voltage of the gate voltage transmitted by the second scan line comprises: in displaying a frame, when a first data line connected with the first pixel provides a high data voltage to the first pixel, adjusting to pull up a low voltage in a grid voltage transmitted by the first scanning line; and/or adjusting to pull down a low voltage of the gate voltages transmitted by the second scan lines when the second data lines connected to the second pixels provide the low data voltages to the second pixels.
6. The liquid crystal panel is characterized by comprising a plurality of pixels, a plurality of first scanning lines, a plurality of second scanning lines, a plurality of first data lines and a plurality of second data lines, wherein the pixels are arranged in an array mode and comprise thin film transistors and pixel electrodes connected with drain electrodes of the thin film transistors;
in each row of pixels, the grids of the first thin film transistors of all the first pixels are connected to a corresponding first scanning line, and the grids of the second thin film transistors of all the second pixels are connected to a corresponding second scanning line;
in each column of pixels, the source electrodes of the first thin film transistors of all the first pixels are connected to a corresponding first data line, and the source electrodes of the second thin film transistors of all the second pixels are connected to a corresponding second data line; wherein the polarities of the pixel voltages of the first pixel electrode of the first pixel and the second pixel electrode of the second pixel are opposite;
in displaying a frame, making a high voltage in the gate voltages transmitted by the first scanning line equal to a high voltage in the gate voltages transmitted by the second scanning line, and adjusting a low voltage in the gate voltages transmitted by the first scanning line and/or a low voltage in the gate voltages transmitted by the second scanning line to make the drain-gate voltage of the first thin film transistor equal to the drain-gate voltage of the second thin film transistor.
7. The liquid crystal panel according to claim 6, wherein in displaying one frame, when the first data line connected to the first pixel supplies the high data voltage to the first pixel so that the first pixel electrode has a pixel voltage of positive polarity, the low voltage of the gate voltages transmitted by the first scan line is pulled up; and/or when a second data line connected with the second pixel supplies a low data voltage to the second pixel so that the second pixel electrode has a pixel voltage with a negative polarity, adjusting and reducing a low voltage in the grid voltage transmitted by the second scanning line.
8. The liquid crystal panel according to claim 6 or 7, wherein the first pixels and the second pixels are alternately arranged in each row of pixels, and in each column of pixels, either the first pixels or the second pixels; or, in each row of pixels, the first pixels and the second pixels are alternately arranged; in each column of pixels, the first pixels and the second pixels are alternately arranged; the pixels adjacent to the first pixel in the vertical direction and the left-right direction are the second pixels.
9. The driving method of the liquid crystal panel is characterized in that the grid electrodes of the first thin film transistors of all the first pixels in each row of pixels of the liquid crystal panel are connected to a corresponding first scanning line, the grid electrodes of the second thin film transistors of all the second pixels in each row of pixels of the liquid crystal panel are connected to a corresponding second scanning line, the source electrodes of the first thin film transistors of all the first pixels in each column of pixels of the liquid crystal panel are connected to a corresponding first data line, the source electrodes of the second thin film transistors of all the second pixels in each column of pixels of the liquid crystal panel are connected to a corresponding second data line, and the polarities of the pixel voltages of the first pixel electrodes of the first pixels and the second pixel electrodes of the second pixels are opposite;
wherein the driving method comprises: in displaying a frame, making a high voltage in the gate voltages transmitted by the first scanning line equal to a high voltage in the gate voltages transmitted by the second scanning line, and adjusting a low voltage in the gate voltages transmitted by the first scanning line and/or a low voltage in the gate voltages transmitted by the second scanning line, so that the drain-gate voltage of the first thin film transistor is the same as the drain-gate voltage of the second thin film transistor.
10. The driving method according to claim 9, wherein the method of adjusting the low voltage of the gate voltage transmitted by the first scan line and/or the low voltage of the gate voltage transmitted by the second scan line comprises: in displaying a frame, when a first data line connected with the first pixel provides a high data voltage to the first pixel, adjusting to pull up a low voltage in a grid voltage transmitted by the first scanning line; and/or adjusting to pull down a low voltage of the gate voltages transmitted by the second scan lines when the second data lines connected to the second pixels provide the low data voltages to the second pixels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710734264.3A CN107422558B (en) | 2017-08-24 | 2017-08-24 | Liquid crystal panel and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710734264.3A CN107422558B (en) | 2017-08-24 | 2017-08-24 | Liquid crystal panel and driving method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107422558A CN107422558A (en) | 2017-12-01 |
| CN107422558B true CN107422558B (en) | 2020-09-18 |
Family
ID=60433861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710734264.3A Active CN107422558B (en) | 2017-08-24 | 2017-08-24 | Liquid crystal panel and driving method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107422558B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581774B (en) * | 2019-01-03 | 2021-11-30 | 京东方科技集团股份有限公司 | Display driving method, gate driver and display device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101240655B1 (en) * | 2006-09-29 | 2013-03-08 | 삼성디스플레이 주식회사 | Driving apparatus for display device |
| JP5266573B2 (en) * | 2007-03-29 | 2013-08-21 | Ｎｌｔテクノロジー株式会社 | Liquid crystal display |
| CN101770104A (en) * | 2009-01-06 | 2010-07-07 | 群康科技(深圳)有限公司 | Liquid crystal display device |
| TWI451176B (en) * | 2011-05-23 | 2014-09-01 | Au Optronics Corp | Liquid crystal display and method of charging/discharging pixels of a liquid crystal display |
| KR101563265B1 (en) * | 2014-05-08 | 2015-10-27 | 엘지디스플레이 주식회사 | Display device and method for driving the same |
-
2017
- 2017-08-24 CN CN201710734264.3A patent/CN107422558B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107422558A (en) | 2017-12-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8248336B2 (en) | Liquid crystal display device and operating method thereof | |
| KR101563265B1 (en) | Display device and method for driving the same | |
| JP4790798B2 (en) | Active matrix liquid crystal display device and driving method thereof | |
| US9891489B2 (en) | Array substrate and liquid crystal display | |
| US7884891B2 (en) | Thin film transistor liquid crystal display | |
| CN113393790B (en) | Display panel driving method and device and display device | |
| KR20070115422A (en) | LCD and its driving method | |
| CN108319049B (en) | Liquid crystal display and driving method thereof | |
| US8274500B2 (en) | Liquid crystal display device | |
| WO2020051992A1 (en) | Driving circuit, driving method, and display panel | |
| US9140949B2 (en) | Array substrate, display panel, display device and method for driving array substrate | |
| WO2017096706A1 (en) | Liquid crystal display panel structure | |
| KR102125281B1 (en) | Display apparatus and method of driving thereof | |
| KR20080001052A (en) | LCD and its driving method | |
| US20150022509A1 (en) | Display device and drive method therefor | |
| US9165516B2 (en) | Display device and drive method therefor | |
| CN107422558B (en) | Liquid crystal panel and driving method thereof | |
| JP4877707B2 (en) | Display device | |
| US8878832B2 (en) | Pixel circuit, display device, and method for driving display device | |
| KR20120118963A (en) | Common voltage driver and liquid crystal display device including thereof | |
| TWI430001B (en) | Display apparatus | |
| WO2011048844A1 (en) | Display apparatus | |
| US9626920B2 (en) | Liquid crystal display device and method for driving same | |
| KR101327870B1 (en) | A liquid crystal display device | |
| CN204740843U (en) | Display device and driving apparatus thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL China Star Optoelectronics Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |