CN100465710C - Driving method of liquid crystal display - Google Patents
Driving method of liquid crystal display Download PDFInfo
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- CN100465710C CN100465710C CNB2006101423329A CN200610142332A CN100465710C CN 100465710 C CN100465710 C CN 100465710C CN B2006101423329 A CNB2006101423329 A CN B2006101423329A CN 200610142332 A CN200610142332 A CN 200610142332A CN 100465710 C CN100465710 C CN 100465710C
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Abstract
A driving method for the LCD is provided in the invention. It provides the driving voltage in the first time step of the period which the driving voltage corresponding to the gray scale image is to drive the liquid crystal image element to display the gray scale image. It provides the replacement voltage in the second time step of the period which the voltage is designed by the gray scale image of the period time.
Description
Technical field
The invention relates to a kind of driving method of LCD, and particularly relevant for a kind of driving method that improves the liquid crystal pixel reaction time in the LCD.
Background technology
In recent years, LCD has been widely used in various electronic products.And, therefore must use backlight to reach the function of demonstration, and reach the purpose of full-colorization simultaneously by red, green, blue trichromatic mixed light because LCD is non-self luminous display.General Backlight For Liquid Crystal Display Panels is divided into two big classes, and a kind of is normal bright formula, and another kind is a lighting-cuting type.In the LCD that adopts the lighting-cuting type backlight, (Color Sequential) is the LCD of type of drive with look preface method, or adopts the LCD of scanning type backlight or flashing type backlight, all is general common technology.
General is being in the LCD of type of drive with look preface method, provide driving voltage and drive liquid crystal pixel, and use in regular turn is red, the backlight irradiating liquid crystal pixels of green, blue three kinds of colors, to show the image frame of different colours, and utilize human eyes to have the effect of persistence of vision, in continuous time, make the additive color mixing of picture, and reach the display result of color.Yet, because the reaction velocity of liquid crystal molecule is fast inadequately, therefore when opening backlight irradiating liquid crystal pixel with the display image picture, the liquid crystal molecule of display panels first half has been reacted to the location image frame has been shown, but the latter half of liquid crystal molecule of display panels still unreacted to the location, and image frame can't be shown really, so picture can present the situation of brightness disproportionation.
The known practice is to add reset voltage between sprite that shows and sprite, in order to reduce the response time of liquid crystal molecule.Thus, the reaction time between sprite and the sprite is shortened, and reach picture displayed brightness unanimity, to solve the problem of display frame brightness irregularities.And in this practice, this reset voltage is with inequality also uncorrelated in order to the driving voltage that drives liquid crystal pixel.Yet because the reset voltage and the driving voltage that are added are inequality also uncorrelated, so that the reaction time between sprite and the sprite can not be along with display frame is different, and the reaction time of relatively lacking is arranged.Thus, when the large-sized LCD of development, the problem of brightness disproportionation still exists, that is still can't solve the problem of picture brightness inequality fully, makes the picture displayed quality reach optimized state.
Therefore, be necessary to propose a kind of driving method, use the reaction time of improving liquid crystal pixel in the LCD, and with the best in qualityization of picture displayed.
Summary of the invention
According to one embodiment of the invention, a kind of driving method of LCD is proposed, first period that the method was included in cycle length provides driving voltage, and wherein this driving voltage is corresponding to the GTG value, in order to drive liquid crystal pixel to show the gray scale image of GTG value representative.In addition, second period in cycle length provides reset voltage, and wherein this reset voltage is that GTG value according to cycle length decides, and the reset voltage of two adjacent cycle lengths and inequality.Wherein the pairing demonstration GTG of different driving voltage is divided into first group of GTG value and second group of GTG value, and when this GTG value of this first period is one of in this first group of GTG value the time, this reset voltage is first voltage, when this GTG value of this first period is one of in this second group of GTG value the time, this reset voltage is second voltage that is different from this first voltage.
According to another embodiment of the present invention, a kind of driving method of LCD is proposed, comprise: first period in each cycle length provide driving voltage to liquid crystal pixel to show gray scale image; And second period in each cycle length provide reset voltage to this liquid crystal pixel, the reset voltage of two wherein adjacent cycle lengths is inequality.Wherein the pairing demonstration GTG of different driving voltage is divided into first group of GTG value and second group of GTG value, and when the GTG value of this gray scale image correspondence of this first period is one of in this first group of GTG value the time, this reset voltage is first voltage, when this GTG value of this gray scale image correspondence of this first period is one of in this second group of GTG value the time, this reset voltage is second voltage that is different from this first voltage.
According to another embodiment of the present invention, a kind of driving method of LCD is proposed, first period that the method was included in cycle length provides driving voltage, wherein this driving voltage is corresponding to the GTG value, in order to the gray scale image of driving liquid crystal pixel, and in first period, provide backlight irradiating liquid crystal pixel with demonstration GTG value representative.In addition, second period in cycle length provides reset voltage, and wherein this reset voltage is according to deciding in the backlight color that provided cycle length.
Description of drawings
For above and other objects of the present invention, feature, advantage and embodiment can be become apparent, appended graphic being described in detail as follows:
Fig. 1 is a kind of change in voltage and the time relation figure that puts on liquid crystal pixel that illustrates according to one embodiment of the invention.
Fig. 2 illustrates according to a kind of reset voltage of one embodiment of the invention and the relation table of image gray-scale level value.
Fig. 3 is a kind of change in voltage and the time relation figure that puts on liquid crystal pixel that illustrates according to another embodiment of the present invention.
Fig. 4 illustrates according to a kind of reset voltage of one embodiment of the invention and the relation table of sprite backlight color.
[main element label declaration]
V1, V2, V3, V4, V5: reset voltage
VD1, VD2, VD3: driving voltage
W1, W2, W3, U1, U2, U3: cycle length
T1, T2, T3: first period
T2, T4, T6: second period
Embodiment
The present invention provides a kind of driving method of LCD, uses the problem that solves the picture displayed brightness irregularities.
Please refer to Fig. 1, is a kind of change in voltage and the time relation figure that puts on liquid crystal pixel that illustrates according to one embodiment of the invention.Shown for putting on the voltage waveform and the absolute value thereof of liquid crystal pixel among the figure, and switching time red, green, blue three kinds of colour backlight sources.According to one embodiment of the invention, and with the operational scenario among the cycle length W1 is example, the first period T1 that this driving method is included among W1 cycle length provides driving voltage VD1, wherein this driving voltage VD1 is corresponding to the image gray-scale level value, and in order to drive the liquid crystal pixel in the display panel, with the different gray scale images that show that each GTG value institute represents respectively.In addition, also the second period T2 in cycle length W1 provides reset voltage V1, in order to quicken the reaction time of liquid crystal molecule, make liquid crystal molecule reach dbjective state fast, with correct demonstration gray scale image, wherein this reset voltage V1 decides according to the pairing GTG value of driving voltage VD1 that the first period T1 applies, and the reset voltage of two adjacent cycle lengths can be inequality because shown gray scale image is different.
In addition,, will show the picture frame time of a picture usually, be divided into a plurality of sprite times, and utilize the result of continuous sprite colour mixture, to reach the purpose that shows a picture gray scale image being in the LCD of type of drive with look preface method.And above-mentioned W1 cycle length be a plurality of sprite times of a picture frame in the time one of them.
And because this driving method must provide backlight in each sprite time, the gray scale image of using on display panel each sprite time shows.Therefore, just a time interval in the first period T1 is opened backlight with the irradiating liquid crystal pixel, and closes this backlight when the first period T1 finishes, and makes each liquid crystal pixel all can demonstrate the gray scale image of GTG value representative at sprite in the time.Wherein this backlight can be redness, green or blue-light source.
In addition, because the reset voltage V1 that provided of the second period T2 at W1 cycle length, must be able to allow the state immediate reaction of liquid crystal molecule arrive the location, even also the speed of liquid crystal molecule rotation is faster, and then reduce between sprite and the sprite and cause the uneven situation of picture too slowly because of the reaction time of liquid crystal molecule, in display panels, gray scale image is shown really.Therefore, the absolute value of voltage of the reset voltage V1 that is provided at the second period T2 must just can make the liquid crystal molecule quick rotation thus more than or equal to the absolute value of voltage of driving voltage VD1, to reach the purpose that reduces the liquid crystal molecule reaction time.
According to one embodiment of the invention, with the grouping of the pairing demonstration GTG of different driving voltage, make that the reset voltage that adds can be according to the pairing demonstration GTG of different driving voltage group, and the different absolute value of voltage of tool.Fig. 2 illustrates according to a kind of reset voltage of one embodiment of the invention and the relation table of image gray-scale level value.With this relation table is example, this table is that the GTG value by the extremely white picture of black picture is divided into first group of GTG value, second group of GTG value and the 3rd group of GTG value, wherein first group of GTG value comprises GTG value 1 to 92, second group of GTG value comprises GTG value 93 to 160, and the 3rd group of GTG value comprises GTG value 161 to 255.The corresponding respectively different reset voltages of three groups of GTG values, first group of corresponding reset voltage V1 of GTG value wherein, second group of corresponding reset voltage V2 of GTG value, and the 3rd group of corresponding reset voltage V3 of GTG value.
That is, when its GTG value of gray scale image that shows be first group of GTG value one of them the time, provide reset voltage V1 can make the reaction time of liquid crystal molecule the shortest; When its GTG value of gray scale image that shows be second group of GTG value one of them the time, provide reset voltage V2 can make the reaction time of liquid crystal molecule the shortest; When its GTG value of gray scale image that shows be the 3rd group of GTG value one of them the time, provide reset voltage V3 can make the reaction time of liquid crystal molecule the shortest.Thus, just can add different reset voltages, to shorten the reaction time according to the difference of the group under the image gray-scale level value.
Please be simultaneously with reference to Fig. 1 and Fig. 2, in the first period T1 of W1 cycle length, the GTG value of driving voltage VD1 correspondence be GTG value 1 to 92 one of them the time, cycle length, the reset voltage that provides of the second period T2 of W1 was V1.And in the first period T3 of W2 cycle length, the GTG value of driving voltage VD2 correspondence be GTG value 93 to 160 one of them the time, cycle length, the reset voltage that provides of the second period T4 of W2 was V2.In addition in cycle length W3, if the GTG value of the driving voltage VD3 correspondence of the first period T5 be GTG value 161 to 255 one of them the time, cycle length, the reset voltage that provides of the second period T6 of W3 was V3.And the absolute value of reset voltage V1, V2, V3 is respectively more than or equal to driving voltage VD1, VD2, VD3.In addition, also provide red, green, blue-light source with the irradiating liquid crystal pixel among W1, W2, the W3 in cycle length in regular turn, gray scale image is shown in display panel.Right above-mentioned driving method is not that being defined in look preface method is in the LCD of type of drive, any those skilled in the art, without departing from the spirit and scope of the present invention, when doing various application.
Except the foregoing description, reset voltage also can be corresponding to by the different GTG values of black picture to white picture, and the different absolute value of voltage of each tool.That is, when each sprite shows the different GTG value of each different gray scale image institute tool, corresponding its GTG value of different reset voltages all is provided, and each reset voltage all makes reaction time of adjacent two sprites for the shortest, so just can effectively reduce the reaction time of liquid crystal molecule, and make the even colour generation of display frame.
Please refer to Fig. 3, is a kind of change in voltage and the time relation figure that puts on liquid crystal pixel that illustrates according to another embodiment of the present invention.Same voltage waveform and the absolute value thereof that puts on liquid crystal pixel that show among the figure, and switching time red, green, blue three kinds of colour backlight sources.According to another embodiment of the present invention, and with the operational scenario among the cycle length U1 is example, the first period T1 that this driving method is included among U1 cycle length provides driving voltage VD1, wherein this driving voltage VD1 is corresponding to the image gray-scale level value, and in order to drive the liquid crystal pixel in the display panel, with show each GTG value the different gray scale images of representative respectively, and in the first period T1, provide backlight irradiating liquid crystal pixel.In addition, also the second period T2 in cycle length U1 provides reset voltage V4, in order to quicken the reaction time of liquid crystal molecule, make liquid crystal molecule reach dbjective state fast, with correct demonstration gray scale image, wherein this reset voltage V4 be according to cycle length U1 the backlight that provided of the first period T1 decide and the color of two adjacent backlights that provided cycle length and inequality.
In addition, above-mentioned U1 cycle length be similarly a plurality of sprite times of a picture frame in the time one of them.And the backlight that provides in the time at these sprites is red, green, blue-light source in regular turn.In addition, because the reset voltage V4 that provided of the second period T2 at U1 cycle length, must be able to allow the state immediate reaction of liquid crystal molecule arrive the location equally, even also the speed of liquid crystal molecule rotation is faster, and then reduce between sprite and the sprite and cause the uneven situation of picture too slowly because of the reaction time of liquid crystal molecule, in display panels, gray scale image is shown really.Therefore, the absolute value of voltage of the reset voltage V4 that is provided at the second period T2 must just can make the liquid crystal molecule quick rotation thus more than or equal to the absolute value of voltage of driving voltage VD1, to reach the purpose that reduces the liquid crystal molecule reaction time.
Fig. 4 illustrates according to a kind of reset voltage of one embodiment of the invention and the relation table of sprite backlight color, backlight that this table demonstration sprite provides and the relation between its pairing reset voltage.Wherein, showing with this is example, when backlight is red (R), pairing reset voltage is V4, and when backlight was green (G), pairing reset voltage was V5, when backlight is blue (B), pairing reset voltage is again V4, and when backlight was red (R), pairing reset voltage was V5.That is, two adjacent therein sub-image times, the reset voltage of one of them sprite in the time is V4, the reset voltage of another sprite in the time wherein is then for being different from the reset voltage V5 of V4.Thus, in the type of drive of utilizing continuous sprite colour mixture, each sprite all corresponds to a reset voltage, and this reset voltage is different with the reset voltage of previous sprite, use the reaction time of effective reduction liquid crystal molecule, and make the even colour generation of display frame.Remove this, also can make the backlight of each color correspond to a specific reset voltage respectively, or make the backlight of each color correspond to a plurality of specific reset voltages respectively, so that the reaction time between sprite and the sprite drops to the shortest.
Please be simultaneously with reference to Fig. 3 and Fig. 4.In the first period T1 of U1 cycle length, red backlight irradiating liquid crystal pixel is provided, cycle length this moment, the reset voltage that provides of the second period T2 of U1 was V4.And in the first period T3 of U2 cycle length, providing green colored backlights source irradiating liquid crystal pixel, cycle length this moment, the reset voltage that provides of the second period T4 of U2 was V5.In the first period T1 of U3 cycle length, provide blue backlight irradiating liquid crystal pixel in addition, cycle length this moment, the reset voltage that provides of the second period T2 of U3 was V4.And the absolute value of reset voltage V4 and V5 is respectively more than or equal to driving voltage VD1, the VD2, the VD3 that provide among U1, U2, the U3 in cycle length.
By the embodiment of the invention described above as can be known, using the present invention can be different and corresponding reset voltage is provided by the gray scale image that shows, the speed that liquid crystal molecule is rotated is faster, in the reaction time of effectively reducing liquid crystal molecule, makes the even colour generation of display frame.
Though the present invention discloses as above with embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (11)
1. the driving method of a LCD comprises:
First period in cycle length provides driving voltage, and wherein this driving voltage is corresponding to the GTG value, in order to drive liquid crystal pixel to show the gray scale image of this GTG value representative; And
Second period in this cycle length provides reset voltage, and wherein this reset voltage is that this GTG value according to this cycle length decides,
Wherein the pairing demonstration GTG of different driving voltage is divided into first group of GTG value and second group of GTG value, and when this GTG value of this first period is one of in this first group of GTG value the time, this reset voltage is first voltage, when this GTG value of this first period is one of in this second group of GTG value the time, this reset voltage is second voltage that is different from this first voltage.
2. driving method according to claim 1, wherein this cycle length be a plurality of sprite times of picture frame in the time one of them.
3. driving method according to claim 1 is wherein opened backlight to shine this liquid crystal pixel in this first period.
4. driving method according to claim 3, wherein this backlight is redness, green or blue-light source.
5. driving method according to claim 1, wherein the absolute value of voltage of this reset voltage is the absolute value of voltage more than or equal to this driving voltage.
6. driving method according to claim 1, wherein this reset voltage corresponding to difference shows the group of GTG the different absolute value of voltage of tool.
7. the driving method of a LCD comprises:
First period in each cycle length provide driving voltage to liquid crystal pixel to show gray scale image; And
Second period in each cycle length provides reset voltage to this liquid crystal pixel, and the reset voltage of two wherein adjacent cycle lengths is inequality,
Wherein the pairing demonstration GTG of different driving voltage is divided into first group of GTG value and second group of GTG value, and when the GTG value of this gray scale image correspondence of this first period is one of in this first group of GTG value the time, this reset voltage is first voltage, when this GTG value of this gray scale image correspondence of this first period is one of in this second group of GTG value the time, this reset voltage is second voltage that is different from this first voltage.
8. driving method according to claim 7 wherein provides backlight to shine this liquid crystal pixel in this first period.
9. driving method according to claim 8, wherein this backlight is redness, green or blue-light source.
10. driving method according to claim 7, wherein in same cycle length, the absolute value of voltage of this reset voltage is the absolute value of voltage more than or equal to this driving voltage.
11. driving method according to claim 7, wherein this reset voltage corresponding to difference shows the group of GTG the different absolute value of voltage of tool.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101423329A CN100465710C (en) | 2006-10-10 | 2006-10-10 | Driving method of liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101423329A CN100465710C (en) | 2006-10-10 | 2006-10-10 | Driving method of liquid crystal display |
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| CN1936657A CN1936657A (en) | 2007-03-28 |
| CN100465710C true CN100465710C (en) | 2009-03-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI468781B (en) * | 2012-06-22 | 2015-01-11 | Au Optronics Corp | Touch-sensing display panel module and related driving method |
| KR101951478B1 (en) * | 2012-07-09 | 2019-02-22 | 엘지전자 주식회사 | Touch Display Apparatus and Multi Touch Display Apparatus |
| CN106773091B (en) * | 2017-02-06 | 2019-05-03 | 京东方科技集团股份有限公司 | 3D display device and its working method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6567063B1 (en) * | 1998-04-10 | 2003-05-20 | Hunet, Inc. | High-speed driving method of a liquid crystal |
| CN1680994A (en) * | 2004-02-19 | 2005-10-12 | 三星Sdi株式会社 | Driving method of FS-LCD |
| CN1700061A (en) * | 2004-05-17 | 2005-11-23 | 三星Sdi株式会社 | Liquid crystal display device and method of driving such a display device |
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2006
- 2006-10-10 CN CNB2006101423329A patent/CN100465710C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6567063B1 (en) * | 1998-04-10 | 2003-05-20 | Hunet, Inc. | High-speed driving method of a liquid crystal |
| CN1680994A (en) * | 2004-02-19 | 2005-10-12 | 三星Sdi株式会社 | Driving method of FS-LCD |
| CN1700061A (en) * | 2004-05-17 | 2005-11-23 | 三星Sdi株式会社 | Liquid crystal display device and method of driving such a display device |
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