KR102007775B1 - Liquid crystal display device and driving method thereof - Google Patents
Liquid crystal display device and driving method thereof Download PDFInfo
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- KR102007775B1 KR102007775B1 KR1020130010984A KR20130010984A KR102007775B1 KR 102007775 B1 KR102007775 B1 KR 102007775B1 KR 1020130010984 A KR1020130010984 A KR 1020130010984A KR 20130010984 A KR20130010984 A KR 20130010984A KR 102007775 B1 KR102007775 B1 KR 102007775B1
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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)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display. In particular, the output period of three data voltages input to a distribution unit connected to one output channel of a main driver and connected to three data lines can be set differently. Another object is to provide a liquid crystal display and a driving method thereof. To this end, the liquid crystal display according to the present invention comprises: a panel in which pixels are formed at intersections of gate lines and data lines; Convert image data into data voltages, divide one horizontal period into a plurality of sub-horizontal periods having different periods, and output one data voltage for each of the sub-horizontal periods through one output channel; A main driver for outputting a plurality of selection signals having a pulse width corresponding to each of the two; And a distribution unit for sequentially outputting data voltages input from the one output channel to the sub-horizontal periods according to the selection signals and sequentially outputting them to different data lines formed in the panel.
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), an organic electroluminescent display (OLED), and more recently, an electrophoretic display ( EPD: ELECTROPHORETIC DISPLAY) is also widely used.
Among flat panel display devices, liquid crystal display devices are the most widely used due to the advantages of mass production technology, ease of driving means, and high quality.
1 is a waveform diagram illustrating various waveforms applied to a conventional low temperature polysilicon (LTPS) type liquid crystal display, and FIG. 2 is a holding time and luminance of data voltages applied to a conventional low temperature polysilicon type liquid crystal display. It is a graph showing the relationship between the reduction rate.
The liquid crystal display device 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 an image is not output.
In the liquid crystal display, the main driver supplies a data voltage to each pixel formed in the panel to drive the liquid crystal of each pixel, and the image is represented by a change in the light transmittance of the liquid crystal.
In the panel, a thin film transistor which is a switching element for driving the 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 polysilicon (LTPS) are used.
Since the polysilicon thin film transistor has a 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 unit connected to the main driver is formed in a non-display area of the panel formed of the polysilicon thin film transistor using the low temperature polysilicon (LTPS). The data divider distributes data voltages supplied from the main driver through one connection line to three data lines.
To this end, the data distribution unit includes three switching transistors connected to the connection line and the data line, and the three switching transistors are sequentially turned on by three selection signals to supply data voltages to the corresponding data lines. do.
That is, each of the three switching transistors sequentially supplies 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 formed to be 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 time of the three switching transistors turned on by each of the three selection signals is one. Is set to timing.
On the other hand, in the liquid crystal display device, in order to prevent the deterioration of the liquid crystal caused by long-term electric field applied to the liquid crystal for a long time, the frame inversion method, the line inversion method, the column inversion method. Various inversion methods such as (Column Inversion) or Dot Inversion methods are applied.
Among these, the column inversion method is a method in which the polarity is changed for each column (vertical line), and in the column inversion method, the polarities of the R, G, and B data are reversed.
In the low-temperature polysilicon type liquid crystal display device configured as described above, since the R, G, and B pixels are formed in each column, the data output to the R, G, and B pixels when the column inversion scheme is applied. The voltage is inverted.
In this case, the holding timing of the green data voltage becomes short due to the polarity inversion of the R, G, and B data voltages.
For example, as shown in FIG. 1, the pulse widths PSWWA of the three selection signals MUX1, MUX2, and MUX3 sequentially output during one horizontal period are the same, and the interval PSWGA between the selection signals is the same. Although the same is true, the holding time GO of the green data voltage outputted to the data line by the second selection signal MUX2 between the first selection signal MUX1 and the third selection signal MUX3 is a red data voltage. Compared with the holding time RO of and the holding time BO of the blue data voltage, it is relatively short.
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 adjacent red pixels, green pixels, and blue pixels is changing. 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, considering the period GR to be changed to 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, green The period during which the data voltage G is output becomes relatively short. That is, in the case of green between different polarity changes, due to the delay due to rising / falling, the data holding time (Source Holding Time) is shorter than the actual input. Have.
In particular, green has the greatest influence on luminance, as shown in FIG. That is, the amount of luminance decrease when the holding time of the green data voltage decreases is relatively larger than the rate at which the holding time of the red data voltage and the blue data voltage decreases and the luminance decreases.
In other words, as the output holding time of the green data voltage, which has the greatest influence on the luminance, is shortened, the green data voltage is not sufficiently charged in the pixel, and thus, the luminance performance. Is falling compared to red and green.
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is capable of differently setting output periods of three data voltages input to a distribution unit connected to one output channel of a main driver and connected to three data lines. Another object is to provide a liquid crystal display and a driving method thereof.
According to an aspect of the present invention, there is provided a liquid crystal display device including: a panel in which pixels are formed at intersections of gate lines and data lines; Convert image data into data voltages, divide one horizontal period into a plurality of sub-horizontal periods having different periods, and output one data voltage for each of the sub-horizontal periods through one output channel; A main driver for outputting a plurality of selection signals having a pulse width corresponding to each of the two; And a distribution unit for sequentially outputting data voltages input from the one output channel to the sub-horizontal periods according to the selection signals and sequentially outputting them to different data lines formed in the panel.
According to an aspect of the present invention, there is provided a method of driving a liquid crystal display device, which converts image data into data voltages, divides one horizontal period into a plurality of sub horizontal periods having different periods, and outputs one output channel. Outputting one data voltage for each of the sub horizontal periods, and outputting a plurality of selection signals having a pulse width corresponding to each of the sub horizontal periods; And sequentially outputting data voltages input for each sub-horizontal period from the one output channel according to the selection signals to different data lines formed in the panel.
According to the present invention, the charging time of the data voltage can be sufficiently secured in the high resolution panel driven by the column inversion method and the LTPS method. That is, since the charging time of the data voltage can be sufficiently secured, it is possible to secure the holding time margin according to the polarity inversion of the data voltage.
In particular, since the holding time margin of the green data voltage having a polarity opposite to that of the red data voltage and the blue data voltage can be secured, the luminance of white is weaker than that of the conventional liquid crystal display. 4% can be improved.
In other words, the shorter the holding time of the data voltage is, the longer the holding time of the green data voltage, which is the greatest decrease in luminance, may increase the overall brightness of the image, in particular, the brightness of the white Can be.
In detail, the margin of the data driver output is eliminated, the margin of the holding time is set to maximum, and the indirect effects of the present invention are indirectly confirmed. On average, about 4% improvement.
1 is a waveform diagram showing various waveforms applied to a conventional low temperature polysilicon (LTPS) type liquid crystal display device.
2 is a graph showing a relationship between a holding time and luminance reduction rate of data voltages applied to a conventional low temperature polysilicon type liquid crystal display device.
Figure 3 is a schematic diagram of an embodiment of a liquid crystal display according to the present invention.
4 is a configuration diagram of an embodiment of a data driver applied to a liquid crystal display according to the present invention.
5 is an exemplary view showing an internal configuration of a switch applied to a liquid crystal display according to the present invention.
6 is a waveform diagram illustrating various waveforms applied to a liquid crystal display according to the present invention.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 3 is a schematic diagram of a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 4 is a schematic diagram of a data driver applied to a liquid crystal display according to the present invention, and FIG. 6 is an exemplary diagram illustrating an internal configuration of a switch applied to a liquid crystal display according to the present invention, and FIG. 6 is a waveform diagram showing various waveforms applied to the liquid crystal display according to the present invention.
In the liquid crystal display according to the present invention, as illustrated in FIG. 2, a
First, the
A plurality of pixels are formed on the lower substrate by the intersection of d data lines DL1 to DLd and g gate lines GL1 to GLg, and sequentially drive the data lines and the gate lines. The
The pixels are formed in the
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 (hereinafter simply referred to as a 'blue pixel') ).
Each of the plurality of pixels is formed between one adjacent gate line and a thin film transistor connected to one adjacent data line, a plurality of pixel electrodes (pixel electrodes) and a plurality of pixel electrodes connected to the thin film transistor, It includes a plurality of common electrodes (not shown) receiving a common voltage.
The semiconductor layer of the thin film transistor, which is applied to the liquid crystal display device according to the present invention, is formed of polysilicon having high electron mobility (˜10
The present invention may be applied to a panel in which the semiconductor layer of the thin film transistor is formed of amorphous silicon, and in particular, may be applied to a panel made of low temperature poly-silicon (LTPS).
The pixel electrode and the common electrode are formed side by side with the liquid crystal layer interposed therebetween, and the liquid crystal is driven according to a difference voltage between the data voltage supplied to the pixel electrode through the thin film transistor and the common voltage supplied to the common electrode. The transmittance is controlled.
The storage capacitor SC is formed in an area 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.
Next, the
As illustrated in FIG. 3, the
For example, the
In addition, the
That is, the
Hereinafter, for convenience of description, the present invention will be described with an example in which the
First, the
Here, the gate-on voltage refers to a voltage capable of turning on the switching thin film transistors connected to the gate lines. The voltage capable of turning off the switching thin film transistor is called a gate-off signal, and the gate-on signal and the gate-off signal are collectively called a scan signal.
When the thin film transistor is 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 a P type, the gate on signal is a low level voltage, and the gate off signal is a high level voltage.
Second, 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, and a gate clock GCLK. Etc. are included.
In particular, the
Therefore, when three data voltages are output during one horizontal period in one
In addition, the
That is, since the
Here, each of the first sub horizontal period, the second sub horizontal period, and the third sub horizontal period may be greater than or equal to a period corresponding to a corresponding pulse width.
In detail, as illustrated in FIG. 5, since the output periods of the three data voltages output from the distribution unit 600 to the three data lines are different from each other, the data voltages may be adjusted accordingly. The first sub-horizontal period, the second sub-horizontal period, and the third sub-horizontal period for outputting to (600) must also be different. To this end, the
In addition, as described above, the
That is, the
Third, the
That is, the
The
The
The digital-to-
Hereinafter, for convenience of description, the first data voltage to the third data voltage are sequentially output for one
Here, the first
The
In this case, the
Here, the second sub-horizontal period for outputting the second data voltage having a polarity different from the polarity of the first and third data voltages may include a first sub-horizontal period and a third sub-horizontal period for outputting the first data voltage. The data voltage is formed longer than the third sub-horizon period.
In addition, the
That is, the
Finally, the distribution unit 600 includes at least one
Each of the
The configuration as described above assumes a case in which one unit pixel forming the
As shown in FIG. 5, each of the
Each
Therefore, the first data voltage output through the first switch TR1 is a red data voltage, the second data voltage output through the second switch TR2 is a green data voltage, and the third switch. The third data voltage output through 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 according to the first selection signal MUX1 and the third according to the third selection signal MUX3. The polarity of the third data voltage output to the third data line through the switch TR3 is output to the second data line through the second switch TR2 according to the second selection signal MUX2. 2 It is formed differently from the polarity of the data voltage.
In addition, as shown in FIG. 6, the pulse width of the second selection signal MUX2 is greater than the pulse width of the first selection signal MUX1 and the pulse width of the third selection signal MUX3. have.
In the following, the liquid crystal display driving method according to the present invention, as described above, is described. In the following description, the content duplicated with the above-described content will be briefly described or omitted.
The liquid crystal display driving method according to the present invention converts image data into data voltages, divides one horizontal period into a plurality of subhorizontal periods having different periods, one for each subhorizontal period through one output channel. Outputting a plurality of selection signals having a pulse width corresponding to each of the sub-horizontal periods, and outputting the data voltages of the sub-horizontal periods from the one
First, the
Next, the
Finally, the distribution unit 600 sequentially outputs the three data voltages to corresponding data lines according to the selection signals.
The first selection signal MUX1 is converted to a high level after the first delay time PSWT corresponding to 10 CLK after the start of one horizontal period, and is output at a first pulse width PSWW1 corresponding to 15 CLK. Accordingly, the first switch TR1 is turned on so that the first data voltage RED is output to the first data line. Therefore, the first data voltage may be charged in the pixel for a time corresponding to about 25 CLK.
The second selection signal MUX2 is output with 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 so that the second data voltage RED is output to the second data line. Accordingly, the second data voltage may be charged in the pixel for a time corresponding to about 30 CLK.
The third selection signal MUX3 is output with a third pulse width PSWW3 corresponding to 25 CLK after the third delay time PSWG2 corresponding to 15 CLK after the output of the second selection signal MUX2. Accordingly, the third switch TR3 is turned on so that 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.
The present invention as described above, by setting the timing (pulse width) of each of the three selection signals (MUX1 to MUX3) that can switch the three switches to different sizes, the charging time of the green data voltage By increasing the size, the luminance decrease can be minimized.
That is, the present invention outputs between the output periods of the red data voltage and the blue data voltage, and increases the output time of the green data voltage having a polarity different from that of the red data voltage and the blue data voltages, thereby increasing the holding time margin ( By securing the Green Holding Time Margin, it is possible to solve the luminance deterioration problem caused by the lack of the holding time of the green data voltage in the conventional liquid crystal display.
Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.
100: panel 200: gate driver
300: data driver 400: timing controller
500: main driver 600: distribution
Claims (10)
Convert image data into data voltages, divide one horizontal period into a plurality of sub-horizontal periods having different periods, and output one data voltage for each of the sub-horizontal periods through one output channel; A main driver for outputting a plurality of selection signals having a pulse width corresponding to each of the two; And
A distribution unit for sequentially outputting data voltages input from the one output channel to the sub-horizontal periods according to the selection signals and sequentially outputting the data voltages to different data lines formed in the panel;
When the data voltages are three, the second sub-horizontal period in which the data voltages having polarities different from the polarities of the two data voltages are output is the first sub-horizontal period and the third sub-horizontal period in which the two data voltages are output. Longer liquid crystal display device.
And two data voltages continuously output from the main driver have different polarities.
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.
The distribution unit includes at least one switch,
The switch,
A first switch connected to the one output channel and the first data line and turned on according to a first selection signal of the selection signals;
A second switch connected to the one output channel and the second data line and turned on according to a second selection signal of the selection signals; And
A third switch connected to the one output channel and a third data line and turned on according to a third selection signal among 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 through the first switch to the first data line according to the first selection signal, and output to the third data line through the third switch according to the third selection signal 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 according to the second selection signal.
And the pulse width of the second selection signal is greater than the pulse width of the first selection signal and the pulse width of the third selection signal.
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 voltage output through the third switch is blue. Liquid crystal display device characterized in that the data voltage.
Switching the data voltages input at each sub-horizontal period from the one output channel according to the selection signals and sequentially outputting the data voltages to different data lines formed in the panel.
When the data voltages are three, the second sub-horizontal period in which the data voltages having polarities different from the polarities of the two data voltages are output is the first sub-horizontal period and the third sub-horizontal period in which the two data voltages are output. A method of driving a liquid crystal display device, characterized in that it is longer.
The pulse width of the second selection signal corresponding to the second sub horizontal period is a pulse width of the first selection signal corresponding to the first sub horizontal period and the pulse of the third selection signal corresponding to the third sub horizontal period. A liquid crystal display device driving method, characterized in that greater than the width.
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