CN107610665B - Driving method and device of liquid crystal display - Google Patents
Driving method and device of liquid crystal display Download PDFInfo
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- CN107610665B CN107610665B CN201710899864.5A CN201710899864A CN107610665B CN 107610665 B CN107610665 B CN 107610665B CN 201710899864 A CN201710899864 A CN 201710899864A CN 107610665 B CN107610665 B CN 107610665B
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Abstract
The invention provides a driving method and a driving device of a liquid crystal display. The method comprises the steps of correspondingly setting a plurality of adjustment coefficients corresponding to a plurality of refresh rates of the liquid crystal display, detecting the refresh rate of the liquid crystal display when the liquid crystal display is driven, searching the adjustment coefficient corresponding to the refresh rate according to the refresh rate, adjusting the initial OD gray scale corresponding to the current frame in the OD lookup table according to a preset adjustment algorithm and the adjustment coefficient to obtain a target OD gray scale, and finally driving the liquid crystal display to display by using the driving voltage corresponding to the target OD gray scale, so that a group of OD lookup tables can be simultaneously suitable for various different refresh rates, and the liquid crystal display is ensured to have the best display effect under different refresh rates on the premise of not increasing a storage space.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method and an apparatus for driving a liquid crystal display.
Background
With the development of Display technology, flat panel Display devices such as liquid Crystal displays (L liquid Crystal displays, L CDs) have advantages such as high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and are becoming the mainstream of Display devices.
Most of the existing liquid crystal display devices in the market are backlight liquid crystal displays (lcds), which include a liquid crystal display panel and a backlight module (backlight module). The liquid crystal display panel has the working principle that liquid crystal molecules are placed in two parallel glass substrates, and the liquid crystal molecules are controlled to change directions by electrifying or not, so that light rays of the backlight module are refracted out to generate pictures.
In the driving process of the liquid crystal display panel, because the response speed of the liquid crystal is limited, it is difficult to achieve the desired deflection angle within one frame time, so that the display brightness is not desired, and the dynamic image shows a tailing, in order to overcome the above-mentioned defects, the prior art proposes an Over Drive (OD) technique to enable the liquid crystal to achieve the desired deflection target within a short time, as shown in fig. 1, the principle of the OD technique is: as shown by a curve shown by a solid line in FIG. 1, when the frame is switched from n-1 to n frames, if the gray scale Gn-1 is required to be changed into the gray scale Gn, if the driving voltage corresponding to the gray scale Gn is only supplied, because the response speed of liquid crystal overturning is slow, the needed gray scale Gn can not be achieved in the nth frame actually, and the OD technology is used, as shown by a curve shown by a dotted line in FIG. 1, the driving voltage corresponding to the gray scale Gn' with a larger voltage difference with the voltage of the gray scale Gn-1 is supplied in the nth frame, so that the liquid crystal overturning speed is accelerated, the needed gray scale Gn is achieved in the nth frame, and the smear problem is solved.
Further, in order to implement the OD technology, in the prior art, an OD lookup table (OD table) is usually stored in the lcd driving system, as shown in table 1, an abscissa of the lookup table is a gray scale of the n-1 th frame, an ordinate of the lookup table is a gray scale of the nth frame, data obtained by searching the gray scales of the n-1 th frame and the nth frame is a gray scale actually output during overdrive, for example, as shown in table 1, the nth frame corresponds to 48 gray scales and the nth frame corresponds to 96 gray scales, and through the lookup table, a driving voltage corresponding to 116 gray scales is actually output during overdrive.
TABLE 1 OD lookup tables
| 0 | 48 | 96 | 144 | 192 | 240 | 255 | |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 48 | 81 | 48 | 26 | 16 | 12 | 8 | 7 |
| 96 | 129 | 116 | 96 | 78 | 68 | 52 | 50 |
| 144 | 174 | 174 | 158 | 144 | 128 | 114 | 114 |
| 192 | 214 | 220 | 212 | 204 | 192 | 182 | 182 |
| 240 | 254 | 254 | 252 | 248 | 246 | 240 | 240 |
| 255 | 255 | 255 | 255 | 255 | 255 | 255 | 255 |
However, since the data source and the operation mode are different, the lcd panel may operate at different refresh rates, such as 60Hz and 144Hz, and currently, in the lcd panel control chip, there are two processing methods for the OD lookup table operating at different refresh rates: the first mode is that only one OD lookup table is stored, and the OD lookup table is checked at different refresh rates, but when the refresh rate changes greatly, the requirements of two refresh rates cannot be well met, and the image quality under one refresh rate is not optimal; the second method is to store a corresponding OD lookup table for each refresh rate, and to drive the liquid crystal display panel using different OD lookup tables when the liquid crystal display panel operates at different refresh rates, but this method requires a large amount of storage space, usually a memory (RAM) of the timing controller, and increases the panel cost.
Disclosure of Invention
The invention aims to provide a driving method of a liquid crystal display, which can enable a group of OD lookup tables to be simultaneously suitable for various different refresh rates through a preset adjusting algorithm, thereby ensuring that the liquid crystal display has the best display effect under different refresh rates on the premise of not increasing storage space.
The present invention also provides a driving apparatus for a liquid crystal display, which can make a set of OD lookup tables simultaneously suitable for different refresh rates through a preset adjustment algorithm, thereby ensuring that the liquid crystal display has the best display effect at different refresh rates without increasing a storage space.
In order to achieve the above object, the present invention provides a driving method of a liquid crystal display, comprising the steps of:
step S1, obtaining the gray scale of a frame of picture to be displayed currently, the gray scale of the frame of picture before the frame of picture to be displayed currently and the refresh rate of the liquid crystal display currently;
step S2, providing an OD lookup table, and finding an initial OD gray scale from the OD lookup table according to the gray scale of a frame of picture to be displayed currently and the gray scale of a frame of picture before the frame of picture to be displayed currently;
step S3, providing an adjustment coefficient lookup table, and looking up the adjustment coefficient corresponding to the refresh rate from the adjustment coefficient lookup table according to the refresh rate of the current liquid crystal display;
step S4, adjusting the initial OD gray scale according to a preset adjusting algorithm and an adjusting coefficient to obtain a target OD gray scale;
and step S5, outputting a driving voltage corresponding to the target OD gray scale, and driving the liquid crystal display to display a frame of picture to be displayed currently.
The preset adjustment algorithm in step S4 is as follows:
wherein X is the gray scale of the previous frame of the current frame to be displayed, Y is the gray scale of the current frame to be displayed, Z is the initial OD gray scale, Gn is the target OD gray scale, C is the adjustment coefficient, and C is greater than or equal to 0.
The adjustment coefficient lookup table includes at least two adjustment coefficients corresponding to two different refresh rates, respectively.
The adjustment coefficient lookup table includes two adjustment coefficients corresponding to a 60Hz refresh rate and a 144Hz refresh rate, respectively.
The OD lookup table is obtained from an internal memory of the timing controller of the liquid crystal display in step S2, and the adjustment coefficient lookup table is obtained from a register of the timing controller of the liquid crystal display in step S3.
The present invention also provides a driving apparatus of a liquid crystal display, comprising: the device comprises a searching module, a first obtaining module, a second obtaining module, a storage module, a calculating module and an output module, wherein the first obtaining module, the second obtaining module, the storage module and the calculating module are respectively connected with the searching module;
the first acquisition module is used for acquiring the gray scale of a frame of picture to be currently displayed by the liquid crystal display and the gray scale of a frame of picture before the frame of picture to be currently displayed;
the second obtaining module is used for obtaining the refresh rate of the current liquid crystal display;
the storage module is used for storing an OD lookup table and an adjustment coefficient lookup table;
the searching module is used for searching and obtaining an initial OD gray scale from the OD lookup table according to the gray scale of a frame of picture to be displayed currently and the gray scale of a frame of picture before the frame of picture to be displayed currently, and searching an adjusting coefficient corresponding to the refreshing rate from the adjusting coefficient lookup table according to the refreshing rate of the liquid crystal display currently;
the calculation module is used for adjusting the initial OD gray scale according to a preset adjustment algorithm and an adjustment coefficient to obtain a target OD gray scale;
and the output module is used for outputting a driving voltage corresponding to the target OD gray scale so as to drive the liquid crystal display to display a frame of picture to be displayed currently.
The preset adjusting algorithm is as follows:
wherein X is the gray scale of the previous frame of the current frame to be displayed, Y is the gray scale of the current frame to be displayed, Z is the initial OD gray scale, Gn is the target OD gray scale, C is the adjustment coefficient, and C is greater than or equal to 0.
The adjustment coefficient lookup table includes at least two adjustment coefficients corresponding to two different refresh rates, respectively.
The adjustment coefficient lookup table includes two adjustment coefficients corresponding to a 60Hz refresh rate and a 144Hz refresh rate, respectively.
The memory module includes: the internal memory of the time sequence controller of the liquid crystal display is used for storing an OD lookup table, and the register of the time sequence controller of the liquid crystal display is used for storing an adjustment coefficient lookup table.
The invention has the beneficial effects that: the invention provides a driving method of a liquid crystal display, which is characterized in that a plurality of adjustment coefficients are correspondingly set corresponding to a plurality of refresh rates of the liquid crystal display, the refresh rate of the liquid crystal display is detected when the liquid crystal display is driven, the adjustment coefficient corresponding to the refresh rate is searched according to the refresh rate, the initial OD gray scale corresponding to the current frame picture in an OD lookup table is adjusted according to a preset adjustment algorithm and the adjustment coefficient to obtain a target OD gray scale, finally, the liquid crystal display is driven to display by using the driving voltage corresponding to the target OD gray scale, and a group of OD lookup tables can be simultaneously suitable for a plurality of different refresh rates through the preset adjustment algorithm, so that the liquid crystal display is ensured to have the optimal display effect under different refresh rates on the premise of not increasing a storage space. The invention provides a driving device of a liquid crystal display, which can enable a group of OD lookup tables to be simultaneously suitable for various different refresh rates through a preset adjusting algorithm, thereby ensuring that the liquid crystal display has the best display effect under different refresh rates on the premise of not increasing storage space.
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For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a driving process of a conventional LCD using OD technology;
FIG. 2 is a schematic diagram of a driving apparatus of a liquid crystal display according to the present invention;
FIG. 3 is a flow chart of a driving method of a liquid crystal display.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 3, the present invention provides a driving method of a liquid crystal display, including the following steps:
step S1, obtaining the gray scale of a frame of image to be displayed currently, the gray scale of a frame of image before the frame of image to be displayed currently, and the refresh rate of the liquid crystal display currently.
Step S2, providing an OD lookup table, and finding an initial OD gray scale from the OD lookup table according to the gray scale of a frame to be currently displayed and the gray scale of a frame preceding the frame to be currently displayed.
For example, if the gray scale of a frame to be displayed currently and the gray scale of a frame before the frame to be displayed currently are 192 gray scales and 144 gray scales, respectively, the OD lookup table is shown in table 1, and the initial OD gray scale is found to be 204 by the lookup table.
Step S3, providing an adjustment coefficient lookup table, and looking up an adjustment coefficient corresponding to the refresh rate from the adjustment coefficient lookup table according to the refresh rate of the current liquid crystal display.
Preferably, the adjustment coefficient lookup table includes at least two adjustment coefficients corresponding to two different refresh rates, respectively. Further, the adjustment coefficient lookup table includes two adjustment coefficients corresponding to a 60Hz refresh rate and a 144Hz refresh rate, respectively, where the two adjustment coefficients corresponding to the 60Hz refresh rate and the 144Hz refresh rate are 0 and 0.5, respectively.
And step S4, adjusting the initial OD gray scale according to a preset adjusting algorithm and an adjusting coefficient to obtain a target OD gray scale.
Preferably, the preset adjustment algorithm in step S4 is:
wherein X is the gray scale of the previous frame of the current frame to be displayed, Y is the gray scale of the current frame to be displayed, Z is the initial OD gray scale, Gn is the target OD gray scale, C is the adjustment coefficient, and C is greater than or equal to 0.
Specifically, with the above embodiment, if the refresh rate of the lcd is 60Hz at this time, the target OD gray scale is 204, and if the refresh rate of the lcd is 144Hz at this time, the target OD gray scale is 204+0.5 × (204-.
And step S5, outputting a driving voltage corresponding to the target OD gray scale, and driving the liquid crystal display to display a frame of picture to be displayed currently.
It should be noted that, in the above process, the present invention sets a plurality of corresponding adjustment coefficients corresponding to a plurality of refresh rates of the liquid crystal display, adjusts the initial OD gray scale through the preset adjustment algorithm and the adjustment coefficients to generate the target OD gray scale, so that the liquid crystal display has the best display effect at different refresh rates on the premise of only storing a group of OD lookup tables including the initial OD gray scale, without increasing storage space, without increasing product cost, and can effectively improve product competitiveness.
Preferably, the OD lookup table is obtained from an internal memory of a timing controller of the liquid crystal display in step S2, the adjustment coefficient lookup table is obtained from a register of the timing controller of the liquid crystal display in step S3, and the target OD gray scale is calculated by the timing controller of the liquid crystal display in step S4.
Referring to fig. 2, the present invention further provides a driving apparatus for a liquid crystal display, including: the device comprises a searching module 1, a first obtaining module 2, a second obtaining module 3, a storage module 4 and a calculating module 5 which are respectively connected with the searching module, and an output module 6 which is connected with the calculating module 5;
the first obtaining module 2 is configured to obtain a gray scale of a frame of picture to be currently displayed by the liquid crystal display and a gray scale of a frame of picture before the frame of picture to be currently displayed;
the second obtaining module 3 is configured to obtain a refresh rate of the current liquid crystal display;
the storage module 4 is used for storing an OD lookup table and an adjustment coefficient lookup table;
the searching module 1 is used for searching an initial OD gray scale from the OD lookup table according to the gray scale of a frame of picture to be displayed currently and the gray scale of a frame of picture before the frame of picture to be displayed currently, and searching an adjusting coefficient corresponding to the refreshing rate from the adjusting coefficient lookup table according to the refreshing rate of the liquid crystal display currently;
the calculating module 5 is used for adjusting the initial OD gray scale according to a preset adjusting algorithm and an adjusting coefficient to obtain a target OD gray scale;
the output module 6 is configured to output a driving voltage corresponding to the target OD gray scale so as to drive the liquid crystal display to display a frame of a current image to be displayed.
Specifically, the preset adjustment algorithm is as follows:
wherein X is the gray scale of the previous frame of the current frame to be displayed, Y is the gray scale of the current frame to be displayed, Z is the initial OD gray scale, Gn is the target OD gray scale, C is the adjustment coefficient, and C is greater than or equal to 0.
Further, the adjustment coefficient lookup table at least comprises two adjustment coefficients respectively corresponding to two different refresh rates. Preferably, the adjustment coefficient lookup table includes two adjustment coefficients corresponding to a 60Hz refresh rate and a 144Hz refresh rate, respectively. The two adjustment factors corresponding to the 60Hz and 144Hz refresh rates are 0 and 0.5, respectively.
For example, if the gray scale of a frame to be displayed currently and the gray scale of a frame before the frame to be displayed currently are 192 gray scales and 144 gray scales respectively, the OD lookup table is shown in table 1, and it can be known by looking up the table that the initial OD gray scale is 204 at this time, if the refresh rate of the liquid crystal display is 60Hz at this time, it can be known by calculation according to the above formula that the target OD gray scale is 204, and if the refresh rate of the liquid crystal display is 144Hz at this time, it can be known by calculation according to the above formula that the target OD gray scale is 204+0.5 × (204-192) ═ 210.
Therefore, the invention sets a plurality of corresponding adjustment coefficients corresponding to a plurality of refresh rates of the liquid crystal display, adjusts the initial OD gray scale through the preset adjustment algorithm and the adjustment coefficients to generate the target OD gray scale, and can ensure that the liquid crystal display has the best display effect under different refresh rates on the premise of only storing a group of OD lookup tables containing the initial OD gray scale without increasing storage space or product cost, thereby effectively improving the product competitiveness.
Specifically, the storage module 4 includes: the internal memory of the time sequence controller of the liquid crystal display is used for storing an OD lookup table, and the register of the time sequence controller of the liquid crystal display is used for storing an adjustment coefficient lookup table.
In summary, the present invention provides a method for driving a liquid crystal display, the method includes setting a plurality of adjustment coefficients corresponding to a plurality of refresh rates of the liquid crystal display, detecting a refresh rate of the liquid crystal display when the liquid crystal display is driven, searching for the adjustment coefficient corresponding to the refresh rate according to the refresh rate, adjusting an initial OD gray scale corresponding to a current frame in an OD lookup table according to a preset adjustment algorithm and the adjustment coefficient to obtain a target OD gray scale, and finally driving the liquid crystal display to display by using a driving voltage corresponding to the target OD gray scale. The invention provides a driving device of a liquid crystal display, which can enable a group of OD lookup tables to be simultaneously suitable for various different refresh rates through a preset adjusting algorithm, thereby ensuring that the liquid crystal display has the best display effect under different refresh rates on the premise of not increasing storage space.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (8)
1. A method for driving a liquid crystal display, comprising the steps of:
step S1, obtaining the gray scale of a frame of picture to be displayed currently, the gray scale of the frame of picture before the frame of picture to be displayed currently and the refresh rate of the liquid crystal display currently;
step S2, providing an OD lookup table, and finding an initial OD gray scale from the OD lookup table according to the gray scale of a frame of picture to be displayed currently and the gray scale of a frame of picture before the frame of picture to be displayed currently;
step S3, providing an adjustment coefficient lookup table, and looking up the adjustment coefficient corresponding to the refresh rate from the adjustment coefficient lookup table according to the refresh rate of the current liquid crystal display;
step S4, adjusting the initial OD gray scale according to a preset adjusting algorithm and an adjusting coefficient to obtain a target OD gray scale;
step S5, outputting a driving voltage corresponding to the target OD gray scale, and driving the liquid crystal display to display a frame of picture to be displayed currently;
the preset adjustment algorithm in step S4 is as follows:
wherein X is the gray scale of the previous frame of the current frame to be displayed, Y is the gray scale of the current frame to be displayed, Z is the initial OD gray scale, Gn is the target OD gray scale, C is the adjustment coefficient, and C is greater than or equal to 0.
2. The method of driving a liquid crystal display according to claim 1, wherein the adjustment coefficient lookup table includes at least two adjustment coefficients corresponding to two different refresh rates, respectively.
3. The method of driving a liquid crystal display according to claim 2, wherein the adjustment coefficient lookup table includes two adjustment coefficients corresponding to a 60Hz refresh rate and a 144Hz refresh rate, respectively.
4. The method of claim 1, wherein the step S2 is to obtain an OD lookup table from an internal memory of a timing controller of the liquid crystal display, and the step S3 is to obtain an adjustment coefficient lookup table from a register of the timing controller of the liquid crystal display.
5. A driving apparatus of a liquid crystal display, comprising: the device comprises a searching module (1), a first obtaining module (2), a second obtaining module (3), a storage module (4), a calculating module (5) and an output module (6), wherein the first obtaining module, the second obtaining module, the storage module and the calculating module (5) are respectively connected with the searching module, and the output module (6) is connected with the calculating module (5);
the first acquisition module (2) is used for acquiring the gray scale of a frame of picture to be currently displayed by the liquid crystal display and the gray scale of a frame of picture before the frame of picture to be currently displayed;
the second obtaining module (3) is used for obtaining the refresh rate of the current liquid crystal display;
the storage module (4) is used for storing an OD lookup table and an adjustment coefficient lookup table;
the searching module (1) is used for searching an initial OD gray scale from the OD lookup table according to the gray scale of a frame of picture to be displayed currently and the gray scale of a frame of picture before the frame of picture to be displayed currently, and searching an adjusting coefficient corresponding to the refreshing rate from the adjusting coefficient lookup table according to the refreshing rate of the liquid crystal display currently;
the calculation module (5) is used for adjusting the initial OD gray scale according to a preset adjustment algorithm and an adjustment coefficient to obtain a target OD gray scale;
the output module (6) is used for outputting a driving voltage corresponding to the target OD gray scale so as to drive the liquid crystal display to display a frame of picture to be displayed currently;
the preset adjusting algorithm is as follows:
wherein X is the gray scale of the previous frame of the current frame to be displayed, Y is the gray scale of the current frame to be displayed, Z is the initial OD gray scale, Gn is the target OD gray scale, C is the adjustment coefficient, and C is greater than or equal to 0.
6. The driving apparatus of the liquid crystal display according to claim 5, wherein the adjustment coefficient lookup table includes at least two adjustment coefficients respectively corresponding to two different refresh rates.
7. The driving apparatus of a liquid crystal display device according to claim 6, wherein the adjustment coefficient lookup table includes two adjustment coefficients corresponding to a 60Hz refresh rate and a 144Hz refresh rate, respectively.
8. The driving apparatus of the liquid crystal display device according to claim 5, wherein the memory module (3) comprises: the internal memory of the time sequence controller of the liquid crystal display is used for storing an OD lookup table, and the register of the time sequence controller of the liquid crystal display is used for storing an adjustment coefficient lookup table.
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| CN113178178A (en) * | 2018-03-23 | 2021-07-27 | 奇景光电股份有限公司 | Overdrive method and time sequence controller |
| JP7246138B2 (en) * | 2018-04-05 | 2023-03-27 | シャープ株式会社 | Video processing device, video processing method, television receiver, control program, and recording medium |
| CN109147695A (en) * | 2018-09-04 | 2019-01-04 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display device and its driving method |
| CN108986762B (en) * | 2018-09-11 | 2021-09-14 | 惠科股份有限公司 | Display device and voltage adjusting method thereof |
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