KR20140098406A - Liquid crystal display device and driving method thereof - Google Patents
Liquid crystal display device and driving method thereof Download PDFInfo
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- KR20140098406A KR20140098406A KR1020130010984A KR20130010984A KR20140098406A KR 20140098406 A KR20140098406 A KR 20140098406A KR 1020130010984 A KR1020130010984 A KR 1020130010984A KR 20130010984 A KR20130010984 A KR 20130010984A KR 20140098406 A KR20140098406 A KR 20140098406A
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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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- 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
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0248—Precharge or discharge of column electrodes before or after applying exact column voltages
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Crystallography & Structural Chemistry (AREA)
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Optics & Photonics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
BACKGROUND OF THE
Flat panel displays (FPDs) are used in various types of electronic products including mobile phones, tablet PCs, and notebook computers. The flat panel display includes a liquid crystal display (LCD), a plasma display panel (PDP), and an organic electroluminescence display (OLED). Recently, an electrophoretic display device EPD: ELECTROPHORETIC DISPLAY) is also widely used.
Among flat panel display devices, liquid crystal display devices are most widely commercialized at present because of advantages of mass production technology, ease of driving means, and realization of high image quality.
FIG. 1 is a waveform diagram showing various waveforms applied to a conventional low-temperature polysilicon (LTPS) type liquid crystal display device, and FIG. 2 is a graph showing the holding time and luminance of data voltages applied to a conventional low- Reduction rate in the case of the present invention.
The liquid crystal display includes a panel and a main driver.
The panel is divided into a display area in which an image is output and a non-display area in which no image is output.
In the liquid crystal display device, the main driver supplies a data voltage to each pixel formed on the panel, drives the liquid crystal of each pixel, and the image is expressed by a change in light transmittance of the liquid crystal.
In the panel, a thin film transistor which is a switching element for driving liquid crystal constituting each pixel is formed. As the thin film transistor, an amorphous thin film transistor using amorphous silicon and a polysilicon thin film transistor using low temperature poly-silicon (LTPS) are used.
Since the polysilicon thin film transistor has higher charge mobility than the amorphous silicon, the polysilicon thin film transistor is suitable for a high-resolution display device requiring a fast response speed.
A data distribution section connected to the main driver is formed in a non-display area of the panel made of the polysilicon thin film transistor using the low temperature polysilicon (LTPS). The data distributor distributes the data voltages supplied from the main driver to one of three data lines through one connection line.
To this end, the data distributor may include three switching transistors connected to the connection line and the data line, and the three switching transistors may be sequentially turned on by three selection signals to supply a data voltage to the corresponding data line do.
That is, each of the three switching transistors sequentially supplies the R, G, and B data voltages to the data lines when the gate is turned on by the selection signal.
Here, since the pulse widths of the three selection signals are constant, the ON time of the switching transistor is set to one timing. That is, since the pulse widths PSWWA of the three selection signals MUX1, MUX2, and MUX3 are the same in FIG. 1, the ON times of the three switching transistors turned on by the three selection signals are one Timing.
On the other hand, in the liquid crystal display device, in order to prevent deterioration of the liquid crystal caused by applying an electric field in one direction to the liquid crystal for a long time, a frame inversion method, a line inversion method, (Column Inversion) or Dot Inversion (Dot Inversion).
Among them, the column inversion method is a method in which the polarity is changed for each column (vertical line), and the polarity of the R, G and B data is inverted in the version in which the column is a version.
In the low temperature polysilicon type liquid crystal display device configured as described above, since R, G, and B pixels are formed in each column, when the column inversion method is applied, data output to the R, G, and B pixels The voltage is reversed.
In this case, the holding timing of the green data voltage is shortened due to the polarity inversion of the R, G, B data voltages.
For example, as shown in FIG. 1, the pulse widths PSWWA of three selection signals MUX1, MUX2, and MUX3 that are sequentially output during one horizontal period are the same, the interval PSWGA between select signals, The holding time GO of the green data voltage output to the data line by the second selection signal MUX2 between the first selection signal MUX1 and the third selection signal MUX3 is the same as the red data voltage Is relatively short in comparison with the holding time (RO) of the blue data voltage and the holding time (BO) of the blue data voltage.
That is, in the low temperature polysilicon type liquid crystal display device driven by the column inversion method, the polarity of the data voltages output to the adjacent red, green, and blue pixels is changed. In this case, the polarities of the red data voltage and the blue data voltage are the same, but the green data voltage has a polarity opposite to that of the red data voltage and the blue data voltage.
Therefore, as shown in FIG. 1, in consideration of the period GR to be changed to the ground and the period P required for polarity conversion, during the period in which the data voltage is actually output while the selection signal is turned on, The period during which the data voltage G is output is relatively short. That is, in the case of the green between the polarities of different polarities, the data holding time of the data voltage for a short time compared to the actual input (Source Holding Time) due to the rising / falling (falling) I have.
Particularly, green has the greatest influence on luminance as shown in Fig. That is, the luminance reduction amount in the case where the holding time of the green data voltage decreases is smaller than the ratio of the luminance reduction due to the reduction of the holding time of the red data voltage and the blue data voltage.
In other words, the green data voltage is not sufficiently charged to the pixels as the holding time of the green data voltage, which has the greatest influence on the luminance, is shortened. As a result, Are falling compared to red and green.
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a liquid crystal display device capable of differently setting an output period of three data voltages input to a distributing unit connected to one output channel of a main driver, , A liquid crystal display device and a driving method thereof.
According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a panel having pixels formed at intersections of gate lines and data lines; And outputs one data voltage for each of the sub horizontal periods through one output channel, and the sub horizontal periods are divided into a plurality of sub horizontal periods having one horizontal period and a plurality of sub horizontal periods having different periods, A main driver for outputting a plurality of selection signals having a pulse width corresponding to each of the plurality of selection signals; And a distributor for switching the data voltages input for each of the sub horizontal periods from the one output channel according to the selection signals and sequentially outputting the data voltages to the different data lines formed on the panel.
According to an aspect of the present invention, there is provided a method of driving a liquid crystal display device, including: converting image data into data voltages, dividing one horizontal period into a plurality of sub-horizontal periods having different periods, Outputting a plurality of selection signals having a pulse width corresponding to each of the sub-horizontal periods, outputting one data voltage for each of the sub-horizontal periods; And switching the data voltages input for each of the sub horizontal periods from the one output channel according to the selection signals and sequentially outputting the data voltages to different data lines formed on the panel.
According to the present invention, in a high-resolution panel driven by a column-version method and an LTPS method, the charging time of the data voltage can be sufficiently secured. That is, since the charging time of the data voltage can be sufficiently secured, it is possible to secure a holding time margin due to the polarity reversal of the data voltage.
In particular, since the holding time margin of the green data voltage having the polarity opposite to the polarity of the red data voltage and the blue data voltage can be secured, the luminance of white is lower than that of the conventional liquid crystal display device 4%.
That is, as the holding time of the data voltage decreases, the holding time of the green data voltage, in which the luminance decreasing rate is the largest, can be prolonged, so that the luminance of the image as a whole can be improved. .
In other words, after indirectly checking the effect of the present invention after eliminating the polarity change of the data driver output and setting the margin of holding time (Holding Time) to the maximum (Max) And an average improvement of about 4%.
1 is a waveform diagram showing various waveforms applied to a conventional low temperature polysilicon (LTPS) type liquid crystal display;
BACKGROUND OF THE
3 is a block diagram schematically showing an embodiment of a liquid crystal display device according to the present invention.
4 is a block diagram of a data driver applied to a liquid crystal display device according to an embodiment of the present invention.
BACKGROUND OF THE
6 is a waveform diagram showing various waveforms applied to a liquid crystal display device according to the present invention;
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 3 is a schematic view of a liquid crystal display device according to an embodiment of the present invention, FIG. 4 is a diagram illustrating a data driver applied to a liquid crystal display device according to an embodiment of the present invention, And FIG. 6 is a waveform diagram showing various waveforms applied to the liquid crystal display device according to the present invention. Referring to FIG.
2, the liquid crystal display device according to the present invention includes a
First, the
The lower substrate is formed with a plurality of pixels provided by intersection of d data lines DL1 to DLd and g gate lines GL1 to GLg and sequentially drives the data lines and the gate lines The
The pixels are formed in a
One pixel is referred to as a red subpixel (hereinafter, simply referred to as a 'red pixel'), a green subpixel (hereinafter, simply referred to as a 'green pixel') and a blue subpixel ).
Each of the plurality of pixels is formed between a neighboring gate line and a thin film transistor connected to one adjacent data line, a plurality of pixel electrodes (pixel electrodes) connected to the thin film transistors, and a plurality of pixel electrodes, And a plurality of common electrodes (not shown) supplied with a common voltage.
The semiconductor layer of the thin film transistor applied to the liquid crystal display according to the present invention is formed of polysilicon having a high electron mobility (~ 10
The present invention can be applied to a panel in which the semiconductor layer of the thin film transistor is formed of amorphous silicon, and particularly to a panel made of low temperature poly-silicon (LTPS).
The liquid crystal is driven according to a difference voltage between a data voltage supplied to the pixel electrode through the thin film transistor and a common voltage supplied to the common electrode, The transmittance is adjusted.
A storage capacitor SC is formed in a region where the pixel electrode and the common electrode overlap. The storage capacitor SC maintains the data voltage charged in the liquid crystal LC for a predetermined period of time.
Next, the
The
For example, the
In addition, the
That is, the
Hereinafter, for convenience of explanation, the present invention will be described by way of example in which the
First, the
Here, the gate-on voltage refers to a voltage capable of turning on the switching thin film transistor connected to the gate lines. The voltage capable of turning off the switching thin film transistor is referred to as a gate off signal, and the gate on signal and the gate off signal are generically referred to as a scan signal.
When the thin film transistor is of the N type, the gate on signal is a high level voltage and the gate off signal is a low level voltage. When the thin film transistor is of the P type, the gate on signal is a low level voltage and the gate off signal is a high level voltage.
The
To this end, the
That is, the
The
The data control signals generated by the
The gate control signals GCS generated by the control signal generator include a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE, a gate start signal VST, a gate clock GCLK, And the like.
Particularly, the
Therefore, when there are three data voltages outputted for one horizontal period in one
In addition, when the data voltages output during one horizontal period are three in one
4, the
Here, each of the first sub-horizontal period, the second sub-horizontal period, and the third sub-horizontal periods may be equal to or greater than a period corresponding to the corresponding pulse width.
5, since the output periods of the three data voltages output to the three data lines in the distributor 600 are different from each other, The first sub-horizontal period, the second sub-horizontal period, and the third sub-horizontal period for outputting the first sub-horizontal period, the second sub-horizontal period, and the third sub- To this end, the
As described above, the
That is, the
The
That is, the
The
The
The digital-to-
Hereinafter, for convenience of explanation, the first data voltage to the third data voltage are sequentially output during one horizontal period (1H), the first data voltage and the third data voltage have a positive polarity, And the second data voltage has a negative polarity.
Here, the one horizontal period (1H) is a period during which the first data voltage to the third data voltage are outputted. As shown in FIG. 6, the horizontal period (1H) is a period during which the scan signals GLCL (Gate-on voltage) of the high-level voltage (gate-on voltage).
The
At this time, the
Here, the second sub-horizontal period in which a second data voltage having a polarity different from the polarity of the first data voltage and the third data voltage is output may include a first sub-horizontal period during which the first data voltage is output, And is longer than the third sub-horizontal period in which the data voltage is output.
The
That is, the
Lastly, the distributor 600 includes at least one or
Each of the
The above-described configuration assumes that one unit pixel forming the
Each of the
Each of the
Therefore, the first data voltage outputted through the first switch TR1 is a red data voltage, the second data voltage outputted through the second switch TR2 is a green data voltage, And the third data voltage output through the third transistor TR3 is a blue data voltage.
Here, the polarity of the first data voltage output to the first data line through the first switch TR1 and the polarity of the first data voltage output to the third data line MUX3 according to the first selection signal MUX1, The polarity of the third data voltage output to the third data line through the switch TR3 is controlled according to the polarity of the third data voltage, which is output to the second data line through the second switch TR2 according to the second selection signal MUX2. 2 polarity of the data voltage.
The pulse width of the second selection signal MUX2 is formed to be larger than the pulse width of the first selection signal MUX1 and the pulse width of the third selection signal MUX3 have.
Hereinafter, a liquid crystal display device driving method according to the present invention constituted as described above will be described. The content of the following description overlapping with that described above will be briefly described or omitted.
A method of driving a liquid crystal display according to the present invention includes converting image data into data voltages, dividing one horizontal period into a plurality of sub-horizontal periods having different periods, outputting one And outputting a plurality of selection signals having a pulse width corresponding to each of the sub horizontal periods and outputting the data voltages input for each of the sub horizontal periods from the one output channel, Switching according to the selection signals, and sequentially outputting the data to different data lines formed on the panel.
The
Next, the
Finally, the distributor 600 sequentially outputs the three data voltages to corresponding data lines according to the selection signals.
The first selection signal MUX1 is switched to a high level after the first delay time PSWT corresponding to 10 CLK after the start of one horizontal period and is output as the first pulse width PSWW1 corresponding to 15 CLK. Accordingly, the first switch TR1 is turned on, and the first data voltage RED is output to the first data line. Thus, the first data voltage may be charged to the pixel for a time corresponding to about 25 CLK.
The second selection signal MUX2 is output as the second pulse width PSWW2 corresponding to 30CLK after the second delay time PSWG1 corresponding to 10CLK after the output of the first selection signal MUX1. Accordingly, the second switch TR2 is turned on, and the second data voltage RED is output to the second data line. Thus, the second data voltage may be charged to the pixel for a time corresponding to about 30 CLK.
The third selection signal MUX3 is output as a third pulse width PSWW3 corresponding to 25CLK after the third delay time PSWG2 corresponding to 15CLK after the output of the second selection signal MUX2. Accordingly, the third switch TR3 is turned on and the third data voltage BLUE is output to the third data line. In Fig. 6, each of SNT1 and SNT2 may include a ground signal and a polarity switching signal.
As described above, the present invention sets the timings (pulse widths) of each of the three selection signals MUX1 to MUX3 capable of switching three switches to be different from each other, So that the reduction in luminance can be minimized.
That is, the present invention increases the output time of the green data voltage having a polarity different from the polarity of the red data voltage and the blue data voltage, output during the output period of the red data voltage and the blue data voltage, Green holding time margin), it is possible to solve the luminance lowering problem caused by the shortage of the holding time of the green data voltage in the conventional liquid crystal display device.
It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.
100: panel 200: gate driver
300: Data driver 400: Timing controller
500: main driver 600: distribution unit
Claims (10)
And outputs one data voltage for each of the sub horizontal periods through one output channel, and the sub horizontal periods are divided into a plurality of sub horizontal periods having one horizontal period and a plurality of sub horizontal periods having different periods, A main driver for outputting a plurality of selection signals having a pulse width corresponding to each of the plurality of selection signals; And
And a distributor for switching the data voltages input for each of the sub horizontal periods from the one output channel according to the selection signals and sequentially outputting the data voltages to the different data lines formed on the panel, Device.
Wherein the two data voltages continuously output from the main driver have different polarities.
When the data voltages are three, the second sub-horizontal period in which a data voltage having a polarity different from the polarity of the two data voltages is output is a first sub-horizontal period in which the two data voltages are output, Wherein the liquid crystal display panel is longer than the liquid crystal display panel.
The selection signals,
A first selection signal having a pulse width corresponding to the first sub-horizontal period;
A second selection signal having a pulse width corresponding to the second sub-horizontal period; And
And a third selection signal having a pulse width corresponding to the third sub-horizontal period.
Wherein the distributing unit includes at least one switching unit,
The switching device includes:
A first switch connected to the one output channel and the first data line and turned on according to a first one of the selection signals;
A second switch connected to the one output channel and the second data line and turned on in response to a second selection signal of the selection signals; And
And a third switch connected to the one output channel and the third data line and turned on according to a third one of the selection signals,
And the second data line is formed between the first data line and the third data line.
A polarity of a first data voltage output to the first data line through the first switch in accordance with the first selection signal and a polarity of a first data voltage output to the third data line through the third switch in accordance with the third selection signal And the polarity of the third data voltage is different from the polarity of the second data voltage output to the second data line through the second switch in accordance with the second selection signal.
Wherein a pulse width of the second selection signal is larger than a pulse width of the first selection signal and a pulse width of the third selection signal.
Wherein the first data voltage output through the first switch is a red data voltage, the second data voltage output through the second switch is a green data voltage, and the third data And the voltage is a blue data voltage.
And switching the data voltages input for each of the sub horizontal periods from the one output channel according to the selection signals and sequentially outputting the data voltages to different data lines formed on the panel, Driving method.
When the data voltages are three, the second sub-horizontal period in which a data voltage having a polarity different from the polarity of the two data voltages is output is a first sub-horizontal period in which the two data voltages are output, And the pulse width of the second selection signal corresponding to the second sub-horizontal period is longer than the pulse width of the first selection signal corresponding to the first sub-horizontal period and the pulse width of the third selection signal corresponding to the third sub- Wherein the pulse width of the signal is larger than the pulse width of the signal.
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Cited By (4)
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KR20160068130A (en) * | 2014-12-04 | 2016-06-15 | 엘지디스플레이 주식회사 | Display Device For Implementing High-Resolution |
KR20180012900A (en) * | 2016-07-27 | 2018-02-07 | 엘지디스플레이 주식회사 | Display Device and Driving Method thereof |
KR20180035963A (en) * | 2016-09-29 | 2018-04-09 | 엘지디스플레이 주식회사 | Display Device and Method of Sub-pixel Transition |
KR20190070739A (en) * | 2017-12-13 | 2019-06-21 | 엘지디스플레이 주식회사 | Display Device And Method Of Driving The Same |
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JP2002318566A (en) * | 2001-04-23 | 2002-10-31 | Hitachi Ltd | Liquid crystal driving circuit and liquid crystal display device |
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KR20160068130A (en) * | 2014-12-04 | 2016-06-15 | 엘지디스플레이 주식회사 | Display Device For Implementing High-Resolution |
KR20180012900A (en) * | 2016-07-27 | 2018-02-07 | 엘지디스플레이 주식회사 | Display Device and Driving Method thereof |
KR20180035963A (en) * | 2016-09-29 | 2018-04-09 | 엘지디스플레이 주식회사 | Display Device and Method of Sub-pixel Transition |
KR20190070739A (en) * | 2017-12-13 | 2019-06-21 | 엘지디스플레이 주식회사 | Display Device And Method Of Driving The Same |
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