CN102693701A - Liquid crystal display device and driving method thereof - Google Patents
Liquid crystal display device and driving method thereof Download PDFInfo
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- CN102693701A CN102693701A CN2011100691326A CN201110069132A CN102693701A CN 102693701 A CN102693701 A CN 102693701A CN 2011100691326 A CN2011100691326 A CN 2011100691326A CN 201110069132 A CN201110069132 A CN 201110069132A CN 102693701 A CN102693701 A CN 102693701A
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Abstract
The present invention discloses a liquid crystal display device and a driving method thereof. The device comprises an upper substrate, a lower substrate, liquid crystals, a film transistor substrate, a data converter, a source driving circuit and a gate driving circuit. A pixel structure of the upper substrate is that a pixel is composed of four sub-pixels of red, green, blue and white in a matrix array in a certain manner; a structure of the lower substrate is that a plurality of film transistors are arranged and combined in a certain manner, wherein film transistors and the sub-pixels on the upper substrate form a one-to-one correspondence. In the liquid crystal display device and the driving method thereof, the white sub-pixel is added, the four sub-pixels of red, green, blue and white are connected in a four-gate connection mode, and gate signals and source signals of a pixel are respectively controlled by a control line and a data line according to different array manners; brightness is increased, and meanwhile, contrast is increased as well; and moreover, power consumption of the apparatus is reduced and cost of the apparatus is lowered.
Description
Technical field
The present invention relates to field of liquid crystal display, in particular, relate to a kind of liquid crystal indicator and driving method thereof.
Background technology
Continuous development along with lcd technology; People are also increasingly high in the requirement aspect the image demonstrations such as brightness, color saturation to liquid crystal indicator; Therefore, the thin film electrocrystal liquid crystal display device that has a front end reveal competence is then by widely as in the display devices such as computer monitor, televisor and mobile phone.
Thin film electrocrystal liquid crystal display device is by liquid crystal display glass, and source electrode drive circuit and gate driver circuit are formed.Liquid crystal display glass is made up of upper substrate and infrabasal plate, keeps certain distance in the middle of upper substrate and the infrabasal plate, and is situated between and is filled with liquid crystal.Wherein, upper substrate is a colored filter, and is green by red, and blue three kinds of primary colours carry out arranged according to certain rules, and by red, green, blue three kinds of groups of primaries synthesize a pixel, therefore, promptly comprise red, green, blue three subpixels in the pixel respectively; Infrabasal plate is the membrane transistor arranged.Upper substrate in thin film electrocrystal liquid crystal display device is corresponding one by one with infrabasal plate, and corresponding upper substrate one subpixels of an electric crystal of infrabasal plate.
The framework mode commonly used of pixel and control line, data line has following several kinds in the current thin film electrocrystal liquid crystal display device:
(1) connected mode of single grid, shown in accompanying drawing 1: the signal of red, green, blue three subpixels of a pixel is controlled by a control line, and source signal is controlled respectively by three data lines.Wherein, control line G1 and data line S1, S2, S3 control first row, first pixel; Control line G2 and data line S1, S2, first pixel of S3 control second row; Control line G3 and data line S1, S2, first pixel of S3 control the third line.
(2) two grid connected mode, shown in accompanying drawing 2: the signal of red, green, blue three subpixels of a pixel is controlled respectively by two control lines, and source signal is controlled respectively by two data lines.Wherein, First red sub-pixel of first pixel of control line G1 and source electrode line S1 control first row; First blue subpixels of first pixel of control line G1 and source electrode line S2 control first row, first green sub-pixels of first pixel of control line G2 and source electrode line S1 control first row; First red sub-pixel of first pixel of control line G3 and source electrode line S1 control second row; First blue subpixels of first pixel of control line G3 and source electrode line S2 control second row, first green sub-pixels of first pixel of control line G4 and source electrode line S1 control second row.
The connected mode of (3) three grids, shown in accompanying drawing 3: the signal of red, green, blue three subpixels of a pixel is controlled respectively by three control lines, and source signal is controlled by a data line.Wherein, the red sub-pixel of first pixel of control line G1 and source electrode line S1 control first row, the green sub-pixels of first pixel of control line G2 and source electrode line S1 control first row, the blue subpixels of first pixel of control line G3 and source electrode line S1 control first row.
R among above-mentioned Fig. 1, Fig. 2 and Fig. 3 representes that redness, G represent that green, B represent blueness.
But; Adopt framework commonly used in above-mentioned three kinds of prior aries; Can not satisfy now people fully to the request for utilization of thin film electrocrystal liquid crystal display device, need that a kind of brightness is higher, contrast is higher, and can reduce display device power consumption, cost-effective liquid crystal indicator simultaneously.
Summary of the invention
In view of this, the invention provides a kind of liquid crystal indicator and driving method thereof, do not satisfy people's demand with the framework that overcomes the pixel in the thin film electrocrystal liquid crystal display device and control line in the prior art, data line, and power consumption, cost problem of higher.
For realizing above-mentioned purpose, the present invention provides following technical scheme:
A kind of liquid crystal indicator comprises: by upper substrate, infrabasal plate and be positioned at the liquid crystal display glass substrate that liquid crystal is between the two formed;
Make the red, green, blue three primary colours convert the data converter of red, green, blue, white pixel data into; The source class of each pixel on the source class driving circuit that input end is connected with said data converter, the output terminal of said source class driving circuit and said upper substrate links to each other, the gate driver circuit that is connected with the grid of each pixel on the said upper substrate;
Dot structure on the said upper substrate is: a pixel adopts certain mode arranged to form by red, green, blue, white four subpixels;
The structure of said infrabasal plate is: by certain mode permutation and combination, the sub-pixel of said thin film transistor (TFT) on said upper substrate is corresponding one by one by a plurality of thin film transistor (TFT)s;
And the grid of the thin film transistor (TFT) that the said red, green, blue in said pixel, white sub-pixel are corresponding is controlled by control line; The source electrode of the thin film transistor (TFT) of said red, green, blue, white sub-pixel correspondence is controlled by data line.
Preferably, said red, green, blue, white four subpixels adopt the arrangement mode of two row, two row or delegation or row to constitute a pixel.
Preferably, the structure of a pixel of arrangement mode formation of said employing two row two row is:
Red pieces pixel and green sub-pixel constitute delegation, blue sub-pixel and white sub-pixel and constitute delegation;
Corresponding formation one row of red pieces pixel, green sub-pixel and corresponding formation one row of white sub-pixel with blue sub-pixel;
And the grid of the thin film transistor (TFT) of the said red, green, blue in the said same pixel, white sub-pixel correspondence is respectively successively by four control lines controls; The source electrode of the thin film transistor (TFT) of said red, green, blue, white sub-pixel correspondence is controlled by a data line.
Preferably, the said structure of a pixel of arrangement mode formation of delegation that adopts is:
Red pieces pixel, green sub-pixel, blue sub-pixel and white sub-pixel are positioned at the horizontal direction arrangement successively in order with delegation;
And the grid of the thin film transistor (TFT) of the said red, green, blue in the said same pixel, white sub-pixel correspondence is controlled by a control line; The source electrode of the thin film transistor (TFT) of said red, green, blue, white sub-pixel correspondence is respectively by four data lines controls.
Preferably, the structure of a pixel of arrangement mode formation of said employing one row is:
Red pieces pixel, green sub-pixel, blue sub-pixel and white sub-pixel are positioned at same row homeotropic alignment successively in order;
And the grid of the thin film transistor (TFT) of the said red, green, blue in the same pixel, white sub-pixel correspondence is respectively by four control lines controls; The source electrode of the thin film transistor (TFT) of said red, green, blue, white sub-pixel correspondence is controlled by a data line.
Preferably, said red, green, blue, white four subpixels constitute the arrangement mode that a pixel has 24 kind of two row two row or delegation or row at least.
A kind of driving method based on the described liquid crystal indicator of claim 1 comprises:
Drive any control line switch opens, make said control line conducting, said control line is connected with the grid of sub-pixel;
The said sub-pixel grid that connects to said control line sends signal;
Open the data line switch of each said sub-pixel source class of control successively, the said data line of conducting;
In the corresponding said sub-pixel of the said control line of conducting and said data line, write corresponding pixel data, said pixel data is red, blue, green or the white pixel data;
Close said control line switch, return and carry out any this step of control line switch opens of driving.
Preferably, the process of any control line switch opens of said driving can for: open the control line switch that is connected with the grid of red, green, blue, white sub-pixel successively;
The order that said drive controlling wiretap is opened has 24 kinds at least.
Preferably, before carrying out any control line switch opens of said driving, comprising:
Presetted pixel data according to white pixel are changed, and obtaining with said red, green, blue three primary colours is radix, deduct the red, green, blue color pixel data that obtain after the said presetted pixel data respectively;
Said presetted pixel data are the positive number more than or equal to zero, and smaller or equal to pixel data minimum in the said red, green, blue three primary colours.
Preferably, when showing complete white picture, only open the control line switch of corresponding white pixel grid successively, and the data line switch of corresponding white pixel source class, write the white pixel data;
When demonstration is deceived picture entirely, close the control line switch of the grid of corresponding white pixel, and the data line switch of corresponding white pixel source class.
Can know via above-mentioned technical scheme, compared with prior art, the invention discloses a kind of liquid crystal indicator and driving method thereof; By red, green normally, what blue pixel was formed Shows Picture;, green through data converter with red, indigo plant; The white pixel data output to source electrode drive circuit, through adopting the connected mode of four grids, make a pixel comprise red, green, blue, white four subpixels; And a signal in the pixel is controlled respectively by four control lines, and the source signal in pixel is controlled by a data line, and through different connected mode between four grids; And the order that control line, data line are opened is different, for controlling four grids multiple mode is provided.In the formation process of pixel, increase white sub-pixels through the present invention, when the show white picture, opened white pixel, more white light is penetrated from backlight, increased brightness; When demonstration is deceived picture entirely, close white pixel, white light can't be penetrated from backlight, make black attitude brightness littler, thereby can play the effect that increases contrast.And, when showing different pictures, red according to data source, green, blue color depth; Red accordingly, green when converting to, indigo plant is during white color depth; Red, green, blue color depth same program reduces; Therefore carry out luminance compensation by white pixel, thereby reach the saving cost, practice thrift the purpose of power consumption.The connected mode that the present invention adopts four grids compared with prior art; Though the gate control lines data increase, the source electrode line decreased number that is to use is from the cost consideration of chip for driving; Saved certain cost; And compared with prior art required backlight illumination can reduce when device of the present invention reaches identical brightness, thereby reaches the purpose of saving power consumption.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is embodiments of the invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
Fig. 1 is the structural representation of the single grid connected mode of pixel in the prior art;
Fig. 2 is the structural representation of pixel bigrid connected mode in the prior art;
Fig. 3 is the structural representation of pixel three grid connected modes in the prior art;
Fig. 4 is the ingredient of the disclosed a kind of liquid crystal indicator of the embodiment of the invention, and the connected mode structural representation of pixel;
Fig. 5 is the arrangement architecture synoptic diagram of four subpixels in the disclosed pixel of Fig. 4 embodiment of the present invention;
Fig. 6 is the disclosed dot structure synoptic diagram of arranging according to horizontal direction of the embodiment of the invention.
Fig. 7 is the disclosed dot structure synoptic diagram of arranging according to vertical direction of the embodiment of the invention;
Fig. 8 is the driving method process flow diagram of the disclosed a kind of liquid crystal indicator of the embodiment of the invention;
Fig. 9 be the disclosed driving method of the embodiment of the invention when using based on concrete apparatus structure synoptic diagram.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
In the disclosed liquid crystal indicator of the embodiment of the invention, this liquid crystal indicator mainly is made up of backlight, time Polarizer, membrane transistor substrate, liquid crystal, color membrane substrates, last polaroid, data converter, source electrode drive circuit and gate driver circuit.Wherein, the membrane transistor substrate is made up of by certain mode arranged the membrane transistor pipe, and red on the corresponding one by one color membrane substrates; Green, indigo plant, the arranged of white four color sub-pixel; And a pixel is made up of four subpixels, comprises above-mentioned red, green; Indigo plant, white four color sub-pixel.The present invention adopts the connection control mode of four grids; Signal by a pixel of control line control; Mode by the source signal of a pixel of data line control has not only increased contrast when increasing brightness, also reduced device power consumption, reduced the cost of device.For making this technical scheme clearer, enumerate embodiment below and be elaborated.
Embodiment one
See also accompanying drawing 4, be the connected mode structural representation of pixel in the embodiment of the invention one disclosed a kind of liquid crystal indicator.
This liquid crystal indicator comprises: by upper substrate, infrabasal plate and be positioned at the liquid crystal display glass substrate that liquid crystal is between the two formed; Be used for the red, green, blue three primary colours are converted into the data converter A of red, green, blue, white pixel data; The source electrode drive circuit B that input end links to each other with said data converter A; The output terminal of said source class driving circuit links to each other with the source class of each pixel, the gate driver circuit C that is connected with the grid of each pixel on the said upper substrate.
In Fig. 4, the dot structure on its upper substrate is: a pixel adopts certain mode arranged to form by red R (Red), green G (green), blue B (blue), white W (White) four subpixels.
The structure of infrabasal plate is: press certain mode permutation and combination by a plurality of thin film transistor (TFT)s, and corresponding one by one in each sub-pixel of upper substrate.I.e. red, green, blue, each corresponding thin film transistor (TFT) of white sub-pixel.
And; The grid of the thin film transistor (TFT) of the said R in pixel, G, B, the corresponding infrabasal plate of W four subpixels is by control line (G4m-3, G4m-2, G4m-1, G4m) control, and the source electrode of the thin film transistor (TFT) of said R, G, B, the corresponding infrabasal plate of W four subpixels is controlled by data line (S2n-1, S2n).
Can know that in the disclosed dot structure of the invention described above embodiment a pixel is made up of four subpixels, respectively corresponding R, G, B, W four subpixels.Because four subpixels ways of connecting in the process that constitutes a pixel is different; Each subpixels and control line and data line ways of connecting also can be different, multiple arrangement mode to R, G, B, W four subpixels can be arranged to constitute a pixel here.
Wherein, above-mentioned R, G, B, W four subpixels adopt the arrangement mode of two row, two row to constitute a pixel.Specifically can be referring to accompanying drawing 4:
R sub-pixel and G sub-pixel constitute delegation, B sub-pixel and W sub-pixel and constitute delegation; Simultaneously, corresponding formation one row with the B sub-pixel of R sub-pixel, G sub-pixel and the corresponding formation one of W sub-pixel are listed as, and combine both to constitute a complete pixel.And the grid that is positioned at the corresponding thin film transistor (TFT) of the R, G, B, W sub-pixel of same pixel is respectively successively by four control lines controls; The source electrode of the thin film transistor (TFT) of R, G, B, W sub-pixel correspondence is controlled by a data line.
In the formation process of pixel, increased white sub-pixels through the present invention, made when the control white sub-pixels is opened, more white light has been penetrated from backlight, thereby increased brightness; When the control white sub-pixels is closed, white light can't be penetrated from backlight, thereby can increase the effect of contrast, promptly increase contrast.
In concrete application process, the display data of input or picture are made up of R, G, B three primary colours, through data converter; Output R, G, B, W pixel data are that a pixel data of 255 colour picture is R (100), G (120) and B (150) like the color depth of maximum, convert R (100-X), G (120-X), B (150-X) and W (X) into after passing through data converter; Wherein, X be one more than or equal to zero positive number, and smaller or equal to (R, G; B) value of minimum in, promptly this value of X can or require according to demand set.
For example, under the liquid crystal indicator of normal white mode, when realizing deceiving picture entirely, only need be to R, G, B, W apply R (0) respectively, G (0), B (0), the voltage that W (0) color depth is corresponding; When realizing complete white picture, to R, G, B, W apply 0 volt of voltage, just can realize R (255), G (255), B (255), the color depth of W (255); And realizing like R (100), when G (120), the colour picture of B (150) color depth, only need be to R, G, B, the W pixel applies R (100-X), G (120-X), B (150-X), the pressurization of W (X) color depth correspondence.
As adopt the liquid crystal display dress of normal black pattern to show that when showing the black picture, R, G, B, W pixel only need apply 0 volt voltage, just can realize R (0), G (0), B (0), the color depth of W (0); When showing complete white picture, R, G, B, the pixel transistor that W is corresponding is all opened, and gives R, G, B, the W pixel applies R (255), G (255), B (255), the voltage that W (255) color depth is corresponding; When showing R (100), when G (120), the colour picture of B (150) color depth, give R, G, B, the W pixel applies R (100-X), G (120-X), B (150-X), the voltage that W (X) color depth is corresponding.In carrying out said process because R, G, the reduction brightness of B respective degrees; Therefore, carry out the compensation of brightness by W, so R; G; The source voltage that applies above the transistor of B correspondence reduces, and has only the voltage that applies above the corresponding transistor of W to increase, and will play the purpose of the power consumption of saving source electrode drive circuit like this.
To sum up can know, through increasing the W pixel, can improve brightness in the present invention.Than having only R, G, the liquid crystal indicator of B pixel under the same situation of black attitude brightness, adopts R, G, B, the W pixel can play the effect that increases contrast.Need to prove,, it is not effectively controlled, also can only increase brightness if only increase the W pixel, therefore, also extremely important to the control of W pixel in the present invention.And R is adopted in contrast, G, B, the liquid crystal indicator of W pixel and employing R, G; The liquid crystal indicator of B pixel when realizing same brightness, adopts R, G; B, the liquid crystal indicator of W pixel need be than employing R, G, the liquid crystal indicator of B pixel is the backlight of low-light level more.The power consumption of backlight accounts for the power consumption ratio about 70% in entire liquid crystal display device.Adopt R, G, B, the liquid crystal indicator of W pixel can play the effect that reduces power consumption.
Based on accompanying drawing 4, be to the concrete control procedure of different pixels:
When having only G1 to open, write data to the R sub-pixel that first row, first is listed as by S1; Write data by S2 to the G sub-pixel that first row, the 4th is listed as.From left to right circulation is carried out successively.
When having only G2 to open, write data to the first G sub-pixel capable, secondary series by S1; Write data by S2 to first row, tertial R sub-pixel.From left to right circulation is carried out successively.
When having only G3 to open, write data to the B sub-pixel that second row, first is listed as by S1; Write data by S2 to the W sub-pixel that second row, the 4th is listed as.From left to right circulation is carried out successively.
When having only G4 to open, write data to the second W sub-pixel capable, secondary series by S1; Write data by S2 to second row, tertial B sub-pixel.From left to right circulation is carried out successively.
When having only G5 to open, write data for the R sub-pixel of the third line, first row by S1; Write data for the G sub-pixel of the third line, the 4th row by S2.From left to right circulation is carried out successively.
When having only G6 to open, write data for the G sub-pixel of the third line, secondary series by S1; Write data for the third line, tertial R sub-pixel by S2.From left to right circulation is carried out successively.
When having only G7 to open, write data for the B sub-pixel of fourth line, first row by S1; Write data for the W sub-pixel of fourth line, the 4th row by S2.From left to right circulation is carried out successively.
When having only G8 to open, write data for the W sub-pixel of fourth line, secondary series by S1; Write data for fourth line, tertial B sub-pixel by S2.From left to right circulation is carried out successively.
Open successively from top to bottom and accomplish the action that a width of cloth picture is write, when next picture writes, the action above the circulation once more.
Hence one can see that, and the type of drive of above-mentioned pixel is pressed the order execution of G1 to G2 to G3 to G4, still; The present invention is not limited to this about the order that drives; Also can drive according to other mode, draw according to the mode of permutation and combination, the mode of driving has 24 kinds of modes.
Need to prove; Above-mentioned R, G, B, W four subpixels have the arrangement mode of 24 kind of two row, two row at least when enough becoming a pixel; Accompanying drawing 4 is a kind of arrangement mode wherein, and these 24 kinds of concrete arrangement modes see also accompanying drawing 5, and its type of drive also with above-mentioned driving similar process.
In this liquid crystal indicator; First sub-pixel and the 4th subpixels of first grid line traffic control first row on the infrabasal plate; Second subpixels and the 3rd subpixels of second grid line traffic control first row; First sub-pixel and the 4th subpixels of the 3rd gate line control second row, second subpixels and the 3rd subpixels of the 4th gate line control second row; And the source electrode of four dissimilar sub-pixels in the same pixel is controlled by a data line.
Four grid connected modes through the invention described above employing; The source electrode line decreased number of compared with prior art using, gate control lines data increase, and still from the cost consideration of chip for driving, in fact the present invention has saved certain cost; And; At device of the present invention compared with prior art, backlight illumination required for the present invention can reduce when reaching identical brightness, thereby reaches the purpose of saving power consumption.
In addition, above-mentioned R, G, B, W four subpixels also can adopt the arrangement mode of delegation or row to constitute a pixel.As shown in Figure 6, be the another kind of transistor syndeton of the disclosed R of the embodiment of the invention, G, B, W.Be specially R, G, B, W pixel be positioned at delegation in order successively horizontal direction arrange and open; And the grid of the thin film transistor (TFT) of the R in same pixel, G, B, W sub-pixel correspondence is controlled by a control line; The source electrode of the thin film transistor (TFT) of R, G, B, W sub-pixel correspondence is respectively by four data lines controls.
When having only G1 to open; S1 writes data to the R sub-pixel of first row, first row, and S2 writes data to the G sub-pixel of first row, secondary series, and S3 writes data to first row, tertial B sub-pixel; S4 writes data to the W sub-pixel of first row, the 4th row, and said process is accomplished successively.
When having only G2 to open; S1 writes data to the R sub-pixel of second row, first row, and S2 writes data to the G sub-pixel of second row, secondary series, and S3 writes data to second row, tertial B sub-pixel; S4 writes data to the W sub-pixel of second row, the 4th row, and said process is accomplished successively.
When having only G3 to open; S1 writes data for the R sub-pixel of the third line, first row, and S2 writes data for the G sub-pixel of the third line, secondary series, and S3 writes data for the third line, tertial B sub-pixel; S4 writes data for the W sub-pixel of the third line, the 4th row, and said process is accomplished successively.
Need to prove that the built-up sequence that the color horizontal direction of R, G, B, W pixel is arranged has 24 kinds of different combinations at least.Gate control lines G1, G2, G3 to Gm-1, Gm can sequenced mode open successively, also can open successively by backward.Arrange pixel according to said structure, in the process of driving pixels, can reduce the cost of chip for driving equally; And; Compare with prior art constructions, backlight illumination required for the present invention can reduce when reaching identical brightness, thereby reaches the purpose of saving power consumption.
In addition, R, G, B, W are equally applicable to the transistor syndeton of Fig. 7, and R, G, B, W pixel vertical direction are arranged and opened; And the grid of the thin film transistor (TFT) of the R in same pixel, G, B, W sub-pixel correspondence is respectively by four control lines controls; The source electrode of the thin film transistor (TFT) of R, G, B, W sub-pixel correspondence is controlled by a data line.
When having only G1 to open, S1 writes data to the R sub-pixel of first row, first row, and S2 writes data to the R sub-pixel of first row, secondary series, and S3 writes data to first row, tertial R sub-pixel, and said process carries out successively.
When having only G2 to open, S1 writes data to the G sub-pixel of second row, first row, and S2 writes data to the G sub-pixel of second row, secondary series, and S3 writes data for the third line, tertial G sub-pixel, and said process carries out successively.
When having only G3 to open, S1 writes data for the B sub-pixel of the third line, first row, and S2 writes data for the B sub-pixel of the third line, secondary series, and S3 writes data for the third line, tertial B sub-pixel, and said process carries out successively.
When having only G4 to open, S1 writes data for the W sub-pixel of fourth line, first row, and S2 writes data for the W sub-pixel of fourth line, secondary series, and S3 writes data for fourth line, tertial W sub-pixel, and said process carries out successively.
Need to prove that the color vertical direction permutation and combination of R, G, B, W pixel has 24 kinds of different combinations in proper order at least.Gate control lines G1, G2, G3, G4 to G4m-3, G4m-2, G4m-1, G4m can sequenced mode open successively, also can open successively by the mode of backward.Equally, arrange pixel according to said structure, in the process of driving pixels; Also can realize reducing the purpose of the cost of chip for driving; Compare with prior art constructions simultaneously, backlight illumination required for the present invention can reduce when reaching identical brightness, thereby reaches the purpose of saving power consumption.
Describe a kind of liquid crystal indicator in detail among the disclosed embodiment of the invention described above,, the invention also discloses a kind of driving method of liquid crystal indicator, see also accompanying drawing 8, mainly may further comprise the steps in the method based on this device:
Step S101 drives any control line switch opens, makes said control line conducting, and said control line is connected with the grid of sub-pixel.
Step S102, the said sub-pixel grid that connects to said control line sends signal.
Step S103 opens the data line switch of controlling each said sub-pixel source class successively, the said data line of conducting, and said data line is connected with said sub-pixel source class.
Step S104 writes corresponding pixel data in the corresponding said sub-pixel of the said control line of conducting and said data line, said pixel data is red, blue, green or the white pixel data.
Step S105 closes said control line switch, returns execution in step S101, and above-mentioned steps is carried out in circulation, promptly drives and opens another control line switch.
Need to prove; Before driving liquid crystal indicator disclosed by the invention; The information of being made up of R, G, B three primary colours that needs to receive is changed via data converter; Obtain R, G, B, W color pixel data, could in the process that drives, write corresponding R, G, B, W color pixel data in the sub-pixel in correspondence.When data converter conversion three primary colours, can adopt the mode of tabling look-up the pixel data of the R that receives, G, B three primary colours to be converted to R, G, B, the W color pixel data of correspondence; Can also change according to the presetted pixel data of W color pixel, obtaining with said R, G, B three primary colours is radix, deducts the R, G, the B color pixel data that obtain after the said presetted pixel data respectively; For example, maximum color depth is that a pixel data of 255 colour picture is R (100), G (120) and B (150), converts R (100-X), G (120-X), B (150-X) and W (X) into after passing through data converter; Wherein, X be one more than or equal to zero positive number, and smaller or equal to (R; G; B) value of minimum in, promptly X is the presetted pixel data of white pixel, this value can or require according to demand set.
In above-mentioned implementation, see also accompanying drawing 9, be example with first pixel and second pixel according to two row, two row arrangement modes, the concrete application process that drives the control line switch opens of connexon pixel gates is:
At first, only open G1, write data for the R sub-pixel of first pixel by S1, S2 writes data for the G sub-pixel of second pixel; Next, only open G2, write data for the G sub-pixel of first pixel by S1, S2 writes data for the R sub-pixel of second pixel; Again next, only open G3, write data for the B sub-pixel of first pixel by S1, S2 writes data for the W sub-pixel of second pixel; At last, open G4 again, write data for the W sub-pixel of first pixel by S1, S2 writes data for the B sub-pixel of second pixel.
Need to prove, the process of any control line switch opens of said driving can for: open the control line switch (G1, G2, G3, G4) that connects red R, green G, blue B, white W sub-pixel grid successively; The order that this drive controlling wiretap is opened has 24 kinds at least according to the mode of permutation and combination.
In addition, based on the disclosed driving method of the invention described above embodiment, when driving the disclosed liquid crystal indicator of the invention described above embodiment; When showing complete white picture; Except that control R, G, B pixel voltage show complete white picture, only need open the control line switch of corresponding W color pixel grid successively, and the data line switch of corresponding W color pixel source class; Write W color pixel data, the white light of more backlight is passed through; When demonstration is deceived picture entirely, except that control R, G, B pixel voltage show entirely and deceive the picture, close the control line switch of the grid of corresponding W color pixel, and the data line switch of corresponding W color pixel source class, increase the contrast of image with this; When showing different pictures; Then in the process of conversion; Utilize data converter to convert the color depth of corresponding R, G, B, W to according to the color depth of the R that receives, G, B three primary colours; In this process, the color depth same program of R, G, B reduces, and carries out luminance compensation by white.Thereby reach the saving cost, practice thrift the purpose of power consumption.
Need to prove that the driving method of the disclosed liquid crystal indicator of the invention described above embodiment is applicable to the liquid crystal indicator that constitutes a pixel according to the arrangement mode that adopts two row, two row or delegation or row.
In sum:
Through disclosed liquid crystal indicator of the embodiment of the invention and driving method thereof; Through when making up a pixel, increasing a white sub-pixels, when the show white picture, open white pixel; More white light is penetrated from backlight, thereby increased brightness; When demonstration is deceived picture entirely, close white pixel, white light can't be penetrated from backlight, black attitude brightness is littler, thereby can play the effect that increases contrast, promptly increases contrast.Simultaneously; Compared with prior art the present invention adopts source electrode line decreased number, the increase of gate control lines data that four grid ways of connecting are used, and still from the cost consideration of chip for driving, in fact the present invention has saved certain cost; And; At device of the present invention compared with prior art, backlight illumination required for the present invention can reduce when reaching identical brightness, thereby reaches the purpose of saving power consumption.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the embodiment disclosed method, so description is fairly simple, relevant part is partly explained referring to method and is got final product.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can be directly with the software modules of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (10)
1. a liquid crystal indicator is characterized in that, comprising: by upper substrate, infrabasal plate and be positioned at the liquid crystal display glass substrate that liquid crystal is between the two formed;
Make the red, green, blue three primary colours convert the data converter of red, green, blue, white pixel data into; The source class of each pixel on the source class driving circuit that input end is connected with said data converter, the output terminal of said source class driving circuit and said upper substrate links to each other, the gate driver circuit that is connected with the grid of each pixel on the said upper substrate;
Dot structure on the said upper substrate is: a pixel adopts certain mode arranged to form by red, green, blue, white four subpixels;
The structure of said infrabasal plate is: by certain mode permutation and combination, the sub-pixel of said thin film transistor (TFT) on said upper substrate is corresponding one by one by a plurality of thin film transistor (TFT)s;
And the grid of the thin film transistor (TFT) that the said red, green, blue in said pixel, white sub-pixel are corresponding is controlled by control line; The source electrode of the thin film transistor (TFT) of said red, green, blue, white sub-pixel correspondence is controlled by data line.
2. device according to claim 1 is characterized in that, said red, green, blue, white four subpixels adopt the arrangement mode of two row, two row or delegation or row to constitute a pixel.
3. device according to claim 2 is characterized in that, the structure that the arrangement mode of said employing two row two row constitutes a pixel is:
Red pieces pixel and green sub-pixel constitute delegation, blue sub-pixel and white sub-pixel and constitute delegation;
Corresponding formation one row of red pieces pixel, green sub-pixel and corresponding formation one row of white sub-pixel with blue sub-pixel;
And the grid of the thin film transistor (TFT) of the said red, green, blue in the said same pixel, white sub-pixel correspondence is respectively successively by four control lines controls; The source electrode of the thin film transistor (TFT) of said red, green, blue, white sub-pixel correspondence is controlled by a data line.
4. device according to claim 2 is characterized in that, the said structure of a pixel of arrangement mode formation of delegation that adopts is:
Red pieces pixel, green sub-pixel, blue sub-pixel and white sub-pixel are positioned at the horizontal direction arrangement successively in order with delegation;
And the grid of the thin film transistor (TFT) of the said red, green, blue in the said same pixel, white sub-pixel correspondence is controlled by a control line; The source electrode of the thin film transistor (TFT) of said red, green, blue, white sub-pixel correspondence is respectively by four data lines controls.
5. device according to claim 2 is characterized in that, the structure that the arrangement mode of said employing one row constitutes a pixel is:
Red pieces pixel, green sub-pixel, blue sub-pixel and white sub-pixel are positioned at same row homeotropic alignment successively in order;
And the grid of the thin film transistor (TFT) of the said red, green, blue in the same pixel, white sub-pixel correspondence is respectively by four control lines controls; The source electrode of the thin film transistor (TFT) of said red, green, blue, white sub-pixel correspondence is controlled by a data line.
6. device according to claim 1 and 2 is characterized in that, said red, green, blue, white four subpixels constitute the arrangement mode that a pixel has 24 kind of two row two row or delegation or row at least.
7. the driving method based on the described liquid crystal indicator of claim 1 is characterized in that, comprising:
Drive any control line switch opens, make said control line conducting, said control line is connected with the grid of sub-pixel;
The said sub-pixel grid that connects to said control line sends signal;
Open the data line switch of each said sub-pixel source class of control successively, the said data line of conducting;
In the corresponding said sub-pixel of the said control line of conducting and said data line, write corresponding pixel data, said pixel data is red, blue, green or the white pixel data;
Close said control line switch, return and carry out any this step of control line switch opens of driving.
8. method according to claim 7 is characterized in that, the process of any control line switch opens of said driving can for: open the control line switch that is connected with the grid of red, green, blue, white sub-pixel successively;
The order that said drive controlling wiretap is opened has 24 kinds at least.
9. method according to claim 7 is characterized in that, before carrying out any control line switch opens of said driving, comprising:
Presetted pixel data according to white pixel are changed, and obtaining with said red, green, blue three primary colours is radix, deduct the red, green, blue color pixel data that obtain after the said presetted pixel data respectively;
Said presetted pixel data are the positive number more than or equal to zero, and smaller or equal to pixel data minimum in the said red, green, blue three primary colours.
10. method according to claim 7 is characterized in that, when showing complete white picture, only opens the control line switch of corresponding white pixel grid successively, and the data line switch of corresponding white pixel source class, writes the white pixel data;
When demonstration is deceived picture entirely, close the control line switch of the grid of corresponding white pixel, and the data line switch of corresponding white pixel source class.
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