CN105334651A - Liquid crystal display screen, display device and method for regulating voltage of common electrode - Google Patents
Liquid crystal display screen, display device and method for regulating voltage of common electrode Download PDFInfo
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- CN105334651A CN105334651A CN201510891125.2A CN201510891125A CN105334651A CN 105334651 A CN105334651 A CN 105334651A CN 201510891125 A CN201510891125 A CN 201510891125A CN 105334651 A CN105334651 A CN 105334651A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- 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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3666—Control of matrices with row and column drivers using an active matrix with the matrix divided into sections
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0204—Compensation of DC component across the pixels in flat panels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
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- Computer Hardware Design (AREA)
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- Optics & Photonics (AREA)
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Abstract
The invention discloses a liquid crystal display screen. The liquid crystal display screen is provided with second pixel units, a mean value voltage is obtained by neutralizing the positive voltages and negative voltages of the adjacent second pixel units, and is fed back to an operational amplifier to provide an actual common electrode voltage for the common electrode, the formula that the positive voltages minus the common electrode voltage equals to the common electrode voltage minus the negative voltages is met, and the phenomenon that the liquid crystal display screen flickers is avoided. Meanwhile, due to the fact that the liquid crystal display screen is divided into a plurality of areas capable of achieving respective control, that is, different common electrode voltages are provided for different areas, the whole screen is free of dead corners and does not flicker. The invention further discloses a display device and a method for regulating the voltage of the common electrode.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly relate to a kind of LCDs, a kind of display device and a kind of public electrode voltages control method.
Background technology
In recent years, liquid crystal display (LiquidCrystalDisplay, LCD) is gradually in the life of people.Display panels as the important component part of liquid crystal display mainly comprises array base palte, color membrane substrates and the liquid crystal molecule between array base palte and color membrane substrates.Display panels makes the transmissivity of display panels change by the orientation of electric field controls liquid crystal molecule, thus realizes Presentation Function.In display panels, controlling the electric field of liquid crystal molecule is decided by the voltage difference between pixel electrode and public electrode, but due to the existence of stray capacitance, signal can cause the voltage of pixel electrode to there is Δ V before and after generation saltus step when closing
pdeviation (feed-through effect), in order to ensure the display quality of display panels, there is the voltage deviation Δ V that exists before and after saltus step in the voltage of all pixel electrodes
pshould be consistent.
But in display panels, due to the delay reason of resistance capacitance, the signal that a gate line transmits can along transmission direction generation distortion, thus the voltage of pixel electrode is caused to postpone along the transmission direction of signal on gate line.And the voltage generally loaded on public electrode is identical, thus cause the voltage deviation Δ V in whole display panels on each pixel cell
pinconsistent, display panels and then occur the problems such as film flicker, this phenomenon is more obvious in large-sized LCD.
Now, conventional solution is by regulating public electrode voltages, i.e. VCOM voltage, meet positive voltage-VCOM=VCOM-negative voltage, flicker level can be dropped to minimum, but which increase man-hour and the difficulty of LCM (LCDModule, liquid crystal display module) operation.In addition, because the zone line of screen is different with the charging effect of areas at both sides (in other words, be positioned at the pixel cell of gate line far-end different from the charging effect of the pixel cell of near-end), then feed-through effect is also different, because VCOM voltage only has one, often take to ensure the display effect of zone line and sacrifice the way of the display effect of two side areas, so causing zone line to glimmer lower, and the situation that both sides flicker is still more serious.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of LCDs, and it can not only avoid full screen flicker occurs, and owing to can precisely follow the tracks of liquid crystal charging voltage, not by the impact that liquid crystal cells is aging, improves reliability.
In addition, the present invention also provides a kind of display device adopting described LCDs.
In addition, the present invention also provides a kind of public electrode voltages control method being applied to described LCDs.
To achieve these goals, embodiment of the present invention adopts following technical scheme:
A kind of LCDs is provided, described LCDs comprises: grid drive chip, data driving chip, many gate lines be connected with described grid drive chip and many data lines be connected with described data driving chip, and many gate lines extended in the row direction and many data lines extended along column direction intersect mutually;
Described LCDs comprises multiple public electrode voltages regulatory region of arranging along described line direction row and multiple and described public electrode voltages regulatory region power amplifier one to one, each described public electrode voltages regulatory region include at least two row adjacent and the second pixel cell that the first pixel cell be arranged in array is adjacent with at least two; The output terminal of each power amplifier exports the public electrode of the public electrode of the first pixel cells all in public electrode voltages to corresponding public electrode voltages regulatory region and at least two adjacent the second pixel cells;
Each described second pixel cell includes thin film transistor (TFT), pixel electrode and field effect transistor, the signal input part of described field effect transistor is connected to described pixel electrode, is connected to the positive input terminal of corresponding operational amplifier after the signal output part being positioned at the field effect transistor of the second adjacent pixel cell of at least two of same public electrode voltages regulatory region is connected in the lump;
Many articles described gate line comprises zero row gate line and the first row gate line, the grid of the thin film transistor (TFT) of described second pixel cell is connected to described zero row gate line, the grid of described field effect transistor is connected to described the first row gate line, and described grid drive chip successively sends a signal to described zero row gate line and described the first row gate line.
Preferably, the negative input end of described operational amplifier is connected to the output terminal of described operational amplifier.
Preferably, each described first pixel cell includes thin film transistor (TFT), public electrode and pixel electrode, described thin film transistor (TFT) comprise by other gate lines except described zero row gate line be connected to described grid drive chip grid, be connected to the signal input part of described data driving chip by described data line and be connected to the signal output part of pixel electrode of described first pixel cell.
Preferably, the signal input part of the thin film transistor (TFT) of described first pixel cell and described second pixel cell is source electrode, and the signal output part of the thin film transistor (TFT) of described first pixel cell and described second pixel cell is for drain;
Or the signal input part of the thin film transistor (TFT) of described first pixel cell and described second pixel cell is for drain, and the signal output part of the thin film transistor (TFT) of described first pixel cell and described second pixel cell is source electrode.
Preferably, described field effect transistor is thin film transistor (TFT) or mos field effect transistor.
Preferably, the signal input part of described field effect transistor is source electrode, and the signal output part of described field effect transistor is drain electrode; Or the signal input part of described field effect transistor is drain electrode, and the signal output part of described field effect transistor is source electrode.
Preferably, each described public electrode voltages regulatory region includes adjacent and the second pixel cell that the first pixel cell be arranged in array is adjacent with 2n of 2n row, n positive integer.
Preferably, described operational amplifier is integrated in described data driving chip.
In addition, also provide a kind of display device, comprise the LCDs described in above-mentioned any one.
In addition, a kind of public electrode voltages control method is also provided, is applied to the LCDs described in above-mentioned any one,
When LCDs shows, grid drive chip transmits voltage signal to zero row gate line, and make the thin film transistor (TFT) conducting of all second pixel cells, a plurality of data lines is charged to described second pixel cell;
After charging complete, described grid drive chip disconnects the voltage signal being sent to described zero row gate line, and transmit described voltage signal to the first row gate line, make the field effect transistor conducting of all described second pixel cells, all described second pixel cell being positioned at same public electrode voltages regulatory region is connected by described field effect transistor and exports an equal threshold voltage, and described equal threshold voltage is sent to the positive input terminal of described operational amplifier;
The output terminal of described operational amplifier provides all public electrodes of described first pixel cell and the public electrode of described second pixel cell in public electrode voltages to corresponding described public electrode voltages regulatory region.
Compared to prior art, the present invention has following beneficial effect:
LCDs of the present invention is provided with the second pixel cell, and obtain equal threshold voltage by the positive-negative polarity voltage neutralizing adjacent described second pixel cell, by after described average Voltage Feedback to operational amplifier to be supplied to the actual public electrode voltages of public electrode one, and meet positive voltage-public electrode voltages=public electrode voltages-negative voltage, avoid described LCDs to occur flicker (flicker) phenomenon.Simultaneously because described LCDs divides into multiple region realizing each Self-controlled, also namely different described public electrode voltages is provided to different regions, therefore can realize full screen not glimmering without dead angle.Further, when described LCDs carries out the display of each two field picture, all can re-start described equal threshold voltage, described equal threshold voltage constantly feeds back to described operational amplifier along with the carrying out of the display routine of described LCDs, also the charge condition of the described pixel cell in concrete region can therefore in real time, accurately be followed the tracks of, not by the impact of liquid crystal aging, improve the reliability that described operational amplifier provides public electrode voltages accurately.
Display device of the present invention, owing to have employed described LCDs, therefore can avoid screen flicker phenomenon when showing.
Public electrode voltages control method of the present invention, owing to adopting in real time, the feedback of subregional public electrode voltages and supply, therefore, it is possible to avoid screen flicker phenomenon.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained as these accompanying drawings.
Fig. 1 is the schematic diagram of a kind of LCDs that the embodiment of the present invention provides.
Fig. 2 is another schematic diagram of a kind of LCDs that the embodiment of the present invention provides.
Fig. 3 is the schematic diagram of the first pixel cell of a kind of LCDs that the embodiment of the present invention provides.
Fig. 4 is the schematic diagram of the second pixel cell of a kind of LCDs that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For ease of describing, can use such as here " ... under ", " ... below ", D score, " ... on ", " on " etc. space relative terms the relation of an element or feature and another (a bit) element or feature is as illustrated in the drawing described.Be appreciated that, when an element or layer be called as another element or layer " on ", " being connected to " or " being couple to " another element or layer time, it can directly on another element or layer, be directly connected to or be couple to another element or layer, or intervening elements or layer can be there is.
Being appreciated that terminology used here is only to describe specific embodiment, not really wanting to limit the present invention.When here using, clearly state unless context separately has, otherwise singulative " " and " being somebody's turn to do " are also intended to comprise plural form.Further, when using in this manual, term " comprises " and/or shows " comprising " existence of described feature, entirety, step, element and/or assembly, but does not get rid of other features one or more, entirety, step, element, assembly and/or its existence of combining or increase.Instructions subsequent descriptions is for implementing better embodiment of the present invention, and right described description is to illustrate for the purpose of rule of the present invention, and is not used to limit scope of the present invention.Protection scope of the present invention is when being as the criterion depending on the claims person of defining.
Refer to Fig. 1 and Fig. 2, embodiments of the invention provide a kind of LCDs, comprising: grid drive chip (GateIC) 10, data driving chip (SourceIC) 20, many gate lines and a plurality of data lines.Many described gate lines and many described data lines intersect to form multiple pixel cell mutually, and that is, two described gate lines of arbitrary neighborhood and two described data lines of arbitrary neighborhood surround pixel cell described in.As shown in Figure 1, many described gate lines G 0, G1, G2 ... Gn in the row direction (i.e. horizontal direction shown in Fig. 1) extends, is spaced along column direction (vertical direction perpendicular to horizontal direction namely shown in Fig. 1), many described data line S1, S2 ... Sn-1, Sn extend along column direction, are spaced in the row direction.Many described gate lines and many described data lines intersect to form multiple pixel cell mutually, and also namely multiple described pixel cell is array distribution.In the present embodiment, described gate lines G 0 between described data driving chip 20 and gate lines G 1, that is, the adjacent described data driving chip 20 of this gate lines G 0 and arranging.
As described in Figure 1, in the present embodiment, the direction (being also the horizontal direction shown in Fig. 1) that described LCDs extends along described gate line arranges multiple operational amplifier 50 side by side, the output terminal of described operational amplifier 50 connects the public electrode of the adjacent described pixel cell of at least two row, and sending public electrode voltages to corresponding public electrode, described data driving chip 20 sends the voltage signal of opposite polarity to adjacent described data line.For example, as shown in Figure 1, described LCDs comprises n public electrode voltages regulatory region, i.e. the first public electrode voltages regulatory region 1 to the n-th public electrode voltages regulatory region n, and wherein, n is positive integer.The two adjacent row pixel cells that each public electrode voltages regulatory region comprises two adjacent data lines and formed by two gate lines of adjacent two data lines and arbitrary neighborhood.Multiple described operational amplifier 50 and multiple public electrode voltages regulatory region one_to_one corresponding.Such as, described first public electrode voltages regulatory region 1 comprises the first row pixel cell and secondary series pixel cell that are arranged in order along data line bearing of trend, first row pixel cell is connected to described first row data line S1, and secondary series pixel cell is connected to described secondary series data line S2; Described operational amplifier 50 connects the pixel cell being positioned at the correspondence of described first public electrode voltages regulatory region 1, and send the public electrode of public electrode voltages VCOM1 to first row and secondary series pixel cell, the polarity contrary (described in the first row such as shown in Fig. 1, pixel cell is positive polarity, and pixel cell described in secondary series is negative polarity) of pixel cell described in the polarity of pixel cell described in first row and secondary series.
In like manner, described n-th public electrode voltages regulatory region n comprises and to be arranged in order along data line bearing of trend and to connect the 2n-1 row pixel cell of 2n-1 column data line S2n-1 and to be arranged in order and the 2n connecting 2n column data line S2n arranges described pixel cell along data line bearing of trend, connect the operational amplifier 50 being positioned at the described pixel cell of described n-th public electrode voltages regulatory region n, transmission public electrode voltages VCOMn to 2n-1 row and 2n arrange the public electrode of described pixel cell; And 2n-1 arranges the polarity contrary (it is positive polarity that the 2n-1 such as shown in Fig. 1 arranges described pixel cell, and it is negative polarity that 2n arranges described pixel cell) that the polarity of described pixel cell and 2n arrange described pixel cell.
As shown in Figure 1, in the present embodiment, multiple pixel cell comprises the first pixel cell 30 and a line second pixel cell 40 that are arranged in array.As shown in Figure 2, described first pixel cell is used for carrying out picture display, and the first all pixel cells 30 forms viewing area 100 jointly.Described second pixel cell 40 does not participate in the picture display of described LCDs, namely, the second pixel cell 40 arranged along the bearing of trend of described gate lines G 0 defines non-display area, it is positioned at the periphery of described viewing area 100, do not participate in the picture display of described LCDs, be only the actual charge condition that test is in the different pixels unit at the diverse location place of described LCDs, therefore described data driving chip 20 can enter described second pixel cell 40 by many described data line input arbitrary datas.For example, the second pixel cell 40 described in the present embodiment is between described viewing area 100 and described data driving chip 20.
See also Fig. 1 and Fig. 3, in the present embodiment, described first pixel cell 30 comprises thin film transistor (TFT) 31, pixel electrode 32 and public electrode 33, forms liquid crystal capacitance between described pixel electrode 32 and described public electrode 33.Described thin film transistor (TFT) 31 comprises grid (Gate), source electrode (Source) and drain electrode (Drain), described grid is connected to grid drive chip 10 by described gate line (as shown in figures 1 and 3 gate lines G 1), described source electrode is connected to described data driving chip 20 as signal input part by described data line (as shown in figures 1 and 3 data line S1), and described drain electrode is connected to described pixel electrode 32 as signal output part.Certainly, those skilled in the art also can arrange the signal transmission direction of described thin film transistor (TFT) flexibly according to real needs, as thin film transistor (TFT) 31 as described in selecting drain electrode as described in signal input part, source electrode as described in signal output part.
See also Fig. 1 and Fig. 4, in the present embodiment, described second pixel cell 40 comprises thin film transistor (TFT) 41, pixel electrode 42, public electrode 43 and field effect transistor 44, forms liquid crystal capacitance between described pixel electrode 42 and described public electrode 43.Described thin film transistor (TFT) 41 comprises grid, source electrode and drain electrode, described grid is connected to grid drive chip 10 by described gate line (as shown in Figure 1 and Figure 4 gate lines G 0), described source electrode is connected to described data driving chip 20 as signal input part by described data line (as shown in Figure 1 and Figure 4 data line S1), and described drain electrode is connected to described pixel electrode 42 as signal output part.Described field effect transistor 44 comprises grid, source electrode and drain electrode, and described grid is connected to grid drive chip 10 by described gate line (as shown in Figure 1 and Figure 4 gate lines G 1), described source electrode is connected to described pixel electrode 42 as signal input part, described drain electrode is connected to the positive input terminal (+) of operational amplifier 50 in the lump after being connected with the signal output part (namely draining) of field effect transistor 44 of other the second pixel cells 40 being positioned at same public electrode voltages regulatory region as signal output part, to transmit data to operational amplifier 50, namely the drain electrode being positioned at all second pixel cells 40 of same public electrode voltages regulatory region is connected to the positive input terminal (+) of operational amplifier 50 jointly as signal output part.
For example, in the present embodiment, each public electrode voltages regulatory region includes the adjacent described pixel cell of two row, the positive input terminal (+) of described operational amplifier 50 is jointly connected to, voltage signal to be transferred to described operational amplifier 50 after the drain electrode being now positioned at two the second pixel cells 40 of same public electrode voltages regulatory region is connected as signal output part.The negative input end (-) of described operational amplifier 50 is connected to the output terminal of operational amplifier 50.Such as, described second pixel cell 40 connecting first row data line S1 is connected with the signal output part of the field effect transistor 44 of described second pixel cell 40 being connected secondary series data line S2, and sending a signal to the positive input terminal (+) of operational amplifier 50 upon connection, the output terminal of this operational amplifier 50 connects the public electrode being positioned at all described pixel cell of the first public electrode voltages regulatory region 1.Certainly, those skilled in the art also can arrange described thin film transistor (TFT) 41 and the respective signal transmission direction of described field effect transistor 44 according to real needs flexibly, as thin film transistor (TFT) 41 as described in selecting drain electrode as described in signal input part, source electrode as described in signal output part, the drain electrode of described field effect transistor 44 as described signal input part, source electrode as described signal output part.
As shown in Figure 1, in the present embodiment, many articles described gate line comprises zero row gate lines G 0 and the first row gate lines G 1, the grid of the thin film transistor (TFT) 41 of described second pixel cell 40 is connected to described grid drive chip 10 by described zero row gate lines G 0, the grid of the field effect transistor 44 of described second pixel cell 40 is connected to described grid drive chip 10 by described the first row gate lines G 1, and described grid drive chip 10 successively sends a signal to described zero row gate lines G 0 and described the first row gate lines G 1.Should be understood that, described hereinly successively to represent individually according to the implication that predetermined sequential is carried out.
In the present embodiment, first described grid drive chip 10 sends voltage signal to described zero row gate lines G 0, make thin film transistor (TFT) 43 conducting of described second pixel cell 40, then described data driving chip 20 is charged to the liquid crystal capacitance of all described second pixel cells 40 by many described data lines, after charging complete, described grid drive chip 10 disconnects the voltage signal being sent to described zero row gate lines G 0, then send voltage signal to described the first row gate lines G 1, field effect transistor 44 conducting of all second pixel cells 40 be now connected with described the first row gate lines G 1, share after described second pixel cell 40 of same public electrode voltages is connected by described field effect transistor 44 and jointly export an equal threshold voltage, and by this average Voltage Feedback to the positive input terminal (+) of described operational amplifier 50, the output terminal of described operational amplifier 50 provides described public electrode voltages to the public electrode of corresponding pixel cell.As shown in Figure 1, in the present embodiment, due to the AC characteristic of liquid crystal drive, therefore described pixel cell needs positive-negative polarity alternating voltage to drive, also namely in the row direction, two the second pixel cells 40 being positioned at same public electrode voltages regulatory region adjacent have contrary polarity.Described equal threshold voltage is after two adjacent the second pixel cell 40 mutual conduction, in positive-negative polarity voltage and after numerical value, to be also in positive-negative polarity voltage and after intermediate value.Should be understood that, described voltage signal can be first send the grid of an enough large voltage (such as 20V to 30V) to thin film transistor (TFT) in order to ensure conducting membrane transistor, and then the voltage sending an about-5V to-10V to the grid of thin film transistor (TFT) in order to ensure to turn off thin film transistor (TFT).
In an embodiment of the present invention, when the described public electrode voltages being provided to described public electrode meets: during positive voltage-public electrode voltages=public electrode voltages-negative voltage, described LCDs can be avoided to occur flicker (flicker) phenomenon.Meanwhile, because LCDs can be divided into multiple region realizing each Self-controlled public electrode voltages, also namely different public electrode voltages is provided to different public electrode voltages regulatory regions, therefore can reach the object that whole screen there will not be flicker.Further, in this enforcement, when described LCDs carries out the display of each two field picture, capital is tested described equal threshold voltage again, along with the carrying out of the display routine of described LCDs, described equal threshold voltage constantly can feed back to described operational amplifier 50, also the charge condition of described second pixel cell 40 in concrete region can therefore in real time, accurately be followed the tracks of, not by the impact of liquid crystal aging, improve the reliability that described operational amplifier 50 provides public electrode voltages accurately.
Should be understood that, in the present embodiment, while grid drive chip 10 transmits voltage signal to described the first row gate lines G 1, the thin film transistor (TFT) 31 of the first pixel cell 30 described in the first row is also switched on, now data driving chip 20 passes through output channel, also be first row data line S1, secondary series data line S2 ... 2n-1 column data S2n-1, 2n column data line S2n gives the described liquid crystal capacitance charging of corresponding described pixel cell, different described operational amplifiers 50 provides described public electrode voltages for the public electrode of each self-corresponding described pixel cell, described liquid crystal capacitance both end voltage difference=liquid crystal cells charging voltage-public electrode voltages, thus realize the rotation of liquid crystal.After described in the first row, the first pixel cell 30 completes charging, described grid drive chip 10 disconnects the voltage signal being sent to described the first row gate lines G 1, transmit voltage signal to described second row gate lines G 2, described data driving chip 20 is charged to the first pixel cell 30 described in the second row by many described data lines ... by that analogy, described grid drive chip 10 is successively by the described thin film transistor (TFT) of described gate line conducting every a line pixel cell, described data driving chip 20 is charged to described pixel cell by many described data lines, different described operational amplifiers 50 provides corresponding for the described public electrode often arranging described pixel cell, different described public electrode voltages, described liquid crystal capacitance both end voltage difference=liquid crystal cells charging voltage-public electrode voltages, thus realize the rotation of liquid crystal, complete the display of described LCDs.
Should be understood that, in the present embodiment, negative input end due to described operational amplifier 50 is connected to the output terminal of described operational amplifier 50, therefore, described operational amplifier 50 is equivalent to voltage follower, when the input voltage of positive input terminal becomes large, the output voltage of described output terminal also becomes large, then the output voltage change conference of this output terminal causes the input voltage of the negative input end of described operational amplifier 50 also to become large; Otherwise the output voltage of described output terminal diminishes, and finally reaches mobile equilibrium.
Further, described operational amplifier 50 not only can be arranged separately, and it goes back accessible site in described data driving chip 20, so can reduce line complexity, simplified wiring, and reduce the production cost of described LCDs.
Further, the field effect transistor 44 of described second pixel cell 40 can be thin film transistor (TFT) or mos field effect transistor.Certainly, in the present embodiment, preferably, described thin film transistor (TFT), as the field effect transistor 44 of described second pixel cell 40, to reduce the production material kind of described LCDs, reduces costs.
As a kind of preferred embodiment, the output terminal of described operational amplifier 50 provides public electrode voltages to arrange the public electrode of described pixel cell to 2n, wherein, n be more than or equal to 1 positive integer, namely also include the described pixel cell of even column in public electrode regulatory region described in each.Because described data driving chip 20 transmits the voltage signal of opposite polarity to adjacent described data line, therefore all second pixel cells 40 of same public electrode regulatory region are positioned at by after the conducting of described field effect transistor 44, the voltage of positive and negative polarity obtains neutralization, and described operational amplifier 50 is obtained accurately all threshold voltages.
The embodiment of the present invention also provides a kind of display device, and described display device adopts the described LCDs in above-described embodiment.Described display device, when showing, can avoid the appearance of scintillation, and concrete principle, as above described in embodiment, is not repeated herein.
The embodiment of the present invention also provides a kind of public electrode voltages control method, be applied to the described LCDs as above described by embodiment, when described LCDs shows, first voltage signal is transmitted to described zero row gate lines G 0, the described thin film transistor (TFT) 41 of all described second pixel cells 40 of described zero row gate lines G 0 conducting, the described liquid crystal capacitance of many described data lines to described second pixel cell 40 charges.The voltage signal being sent to described zero row gate lines G 0 is disconnected after charging complete, voltage sends a signal to described the first row gate lines G 1, the described field effect transistor 44 of all described second pixel cells 40 of described the first row gate lines G 1 conducting, all described second pixel cell 40 sharing same described public electrode voltages is connected by described field effect transistor 44 and exports equal threshold voltage, and this equal threshold voltage is sent to the positive input terminal of described operational amplifier 50, the output terminal of described operational amplifier 50 provides described public electrode voltages to the described public electrode of corresponding described pixel cell.
While the described field effect transistor 44 of all described second pixel cells 40 of described the first row gate lines G 1 conducting, described in the first row, the described thin film transistor (TFT) of the first pixel cell 30 is also switched on, and described data driving chip 20 sends a signal to the first pixel cell 30 described in the first row by many described data lines and shows to drive it.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a LCDs, it is characterized in that, described LCDs comprises: grid drive chip, data driving chip, many gate lines be connected with described grid drive chip and many data lines be connected with described data driving chip, and many gate lines extended in the row direction and many data lines extended along column direction intersect mutually;
Described LCDs comprises multiple public electrode voltages regulatory region of arranging along described line direction row and multiple and described public electrode voltages regulatory region power amplifier one to one, each described public electrode voltages regulatory region include at least two row adjacent and the second pixel cell that the first pixel cell be arranged in array is adjacent with at least two; The output terminal of each power amplifier exports the public electrode of the public electrode of the first pixel cells all in public electrode voltages to corresponding public electrode voltages regulatory region and at least two adjacent the second pixel cells;
Each described second pixel cell includes thin film transistor (TFT), pixel electrode and field effect transistor, the signal input part of described field effect transistor is connected to described pixel electrode, is connected to the positive input terminal of corresponding operational amplifier after the signal output part being positioned at the field effect transistor of the second adjacent pixel cell of at least two of same public electrode voltages regulatory region is connected in the lump;
Many articles described gate line comprises zero row gate line and the first row gate line, the grid of the thin film transistor (TFT) of described second pixel cell is connected to described zero row gate line, the grid of described field effect transistor is connected to described the first row gate line, and described grid drive chip successively sends a signal to described zero row gate line and described the first row gate line.
2. LCDs as claimed in claim 1, it is characterized in that, the negative input end of described operational amplifier is connected to the output terminal of described operational amplifier.
3. LCDs as claimed in claim 2, it is characterized in that, each described first pixel cell includes thin film transistor (TFT), public electrode and pixel electrode, described thin film transistor (TFT) comprise by other gate lines except described zero row gate line be connected to described grid drive chip grid, be connected to the signal input part of described data driving chip by described data line and be connected to the signal output part of pixel electrode of described first pixel cell.
4. LCDs as claimed in claim 3, it is characterized in that, the signal input part of the thin film transistor (TFT) of described first pixel cell and described second pixel cell is source electrode, and the signal output part of the thin film transistor (TFT) of described first pixel cell and described second pixel cell is for drain;
Or the signal input part of the thin film transistor (TFT) of described first pixel cell and described second pixel cell is for drain, and the signal output part of the thin film transistor (TFT) of described first pixel cell and described second pixel cell is source electrode.
5. LCDs as claimed in claim 1, it is characterized in that, described field effect transistor is thin film transistor (TFT) or mos field effect transistor.
6. LCDs as claimed in claim 1, it is characterized in that, the signal input part of described field effect transistor is source electrode, and the signal output part of described field effect transistor is drain electrode;
Or the signal input part of described field effect transistor is drain electrode, and the signal output part of described field effect transistor is source electrode.
7. LCDs as claimed in claim 1, is characterized in that, each described public electrode voltages regulatory region include 2n row adjacent and the second pixel cell that the first pixel cell be arranged in array is adjacent with 2n, n positive integer.
8. LCDs as claimed in claim 1, it is characterized in that, described operational amplifier is integrated in described data driving chip.
9. a display device, is characterized in that, comprises the LCDs as described in any one of claim 1-8.
10. a public electrode voltages control method, is characterized in that, is applied to the LCDs as described in any one of claim 1-8,
When LCDs shows, grid drive chip transmits voltage signal to zero row gate line, and make the thin film transistor (TFT) conducting of all second pixel cells, a plurality of data lines is charged to described second pixel cell;
After charging complete, described grid drive chip disconnects the voltage signal being sent to described zero row gate line, and transmit described voltage signal to the first row gate line, make the field effect transistor conducting of all described second pixel cells, all described second pixel cell being positioned at same public electrode voltages regulatory region is connected by described field effect transistor and exports an equal threshold voltage, and described equal threshold voltage is sent to the positive input terminal of described operational amplifier;
The output terminal of described operational amplifier provides all public electrodes of described first pixel cell and the public electrode of described second pixel cell in public electrode voltages to corresponding described public electrode voltages regulatory region.
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