CN110288958B - Display panel driving method, driving device and display device - Google Patents
Display panel driving method, driving device and display device Download PDFInfo
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- CN110288958B CN110288958B CN201910503884.5A CN201910503884A CN110288958B CN 110288958 B CN110288958 B CN 110288958B CN 201910503884 A CN201910503884 A CN 201910503884A CN 110288958 B CN110288958 B CN 110288958B
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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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Abstract
The invention discloses a driving method, a driving device and a display device of a display panel, wherein the driving method of the display panel comprises the following steps: detecting the frame rate of a display picture in a display panel; determining a target overdrive value according to the frame rate of the display picture; and driving the display panel according to the target overdrive value. The technical scheme of the invention can solve the problem of smear of the display picture of the display panel.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving method and a driving apparatus for a display panel, and a display apparatus.
Background
The liquid crystal display displays different pictures by applying different driving voltages to liquid crystal molecules to rotate the liquid crystal molecules in different directions. However, since the rotation of the liquid crystal molecules requires a certain response time, the shorter the response time is, the more slight the smear of the display screen is, and the longer the response time is, the more serious the smear of the display screen is.
In order to solve the problem of the image smear of the display panel, the liquid crystal is usually driven by an Over Driver (OD) to reach the desired deflection direction in a short time, i.e. a voltage larger than the voltage to be displayed is applied to the display panel to accelerate the turning speed of the liquid crystal molecules. The overdrive technique is generally implemented by a timing controller, where an overdrive lookup table is preset in a memory inside the timing controller, and when the timing controller is powered on, the timing controller reads data from the memory to calculate an overdrive value, and drives the display panel according to the calculated overdrive value, for example, when the gray scale of the previous frame is 32, the gray scale of the current frame is 128, and the gray scale of 144 is actually output.
However, in the actual working process, the frame rate of the display screen of the display panel changes, and at this time, the overdrive lookup table corresponding to the original frame rate is still operated, so that the display effect is poor.
Disclosure of Invention
The embodiment of the invention provides a driving method, a driving device and a display device of a display panel, and aims to solve the problem of smear of a display picture of the display panel.
In order to achieve the above object, the present invention provides a driving method of a display panel, the driving method of the display panel is applied to a driving device of the display panel, the driving device of the display panel is disposed in a system chip, and the driving method of the display panel includes the following steps:
detecting the frame rate of a display picture in a display panel;
determining a target overdrive value according to the frame rate of the display picture; and
and driving the display panel according to the target overdrive value.
Optionally, the step of determining a target overdrive value according to the frame rate of the display screen includes:
calculating a gain value according to the frame rate of the display picture;
and determining a target overdrive value according to the gain value.
Optionally, the step of calculating a gain value according to the frame rate of the display screen includes:
and calculating the ratio of the frame rate of the display picture to a preset frame rate, and taking the ratio as a gain value.
Optionally, the step of determining a target overdrive value according to the frame rate of the display screen includes:
judging whether the frame rate of the display picture is consistent with a preset frame rate or not;
when the frame rate of the display picture is consistent with a preset frame rate, acquiring an overdrive value corresponding to the preset frame rate from an overdrive lookup table; and
and taking the overdrive value as a target overdrive value.
Optionally, after the step of determining the target overdrive value according to the frame rate of the display screen, the method further includes:
and storing the target overdrive value in an overdrive lookup table.
In order to achieve the above object, the present invention further provides a driving apparatus for a display panel, the driving apparatus for a display panel being disposed in a system chip, the driving apparatus for a display panel comprising:
frame rate detection means configured to detect a frame rate of a display screen in the display panel;
a computing device configured to determine a target overdrive value according to a frame rate of the display screen, and to drive a display panel at the target overdrive value.
Optionally, the computing device includes:
a gain value calculation device configured to calculate a gain value according to a frame rate of the display screen
An overdrive value calculation device configured to calculate a target overdrive value from the gain value.
Optionally, the computing device includes:
the judging device is configured to judge whether the frame rate of the display picture is consistent with a preset frame rate;
and the acquisition device is configured to acquire an overdrive value corresponding to a preset frame rate from an overdrive lookup table when the frame rate of the display screen is consistent with the preset frame rate, and take the overdrive value as a target overdrive value.
Optionally, the driving apparatus of the display panel further includes:
a storage configured to store the target overdrive value to an overdrive lookup table.
In order to achieve the above object, the present invention further provides a display device, where the display device includes any one of the above driving devices for a display panel, a system chip, a control circuit board, and a display panel, the driving device for the display panel is disposed in the system chip, and both the system chip and the display panel are electrically connected to the control circuit board.
According to the technical scheme, the frame rate of the display picture of the display panel is detected, when the frame rate of the display picture is changed, the target overdrive value is determined according to the frame rate of the display picture, and the display panel is driven by the determined target overdrive value. The technical scheme of the invention can automatically adjust the overdrive value of the display panel according to the frame rate change of the display picture, and ensures that the display panel has high-quality display effect under different frame rates.
Drawings
FIG. 1 is a flowchart illustrating a driving method of a display panel according to an embodiment of the present invention;
FIG. 2 is a detailed flowchart of step S2 in FIG. 1;
FIG. 3 is a schematic view of another detailed flow chart of step S2 in FIG. 1;
FIG. 4 is a schematic structural diagram of a driving apparatus for a display panel according to an embodiment of the present invention;
FIG. 5 is a block diagram of an embodiment of the computing device of FIG. 4;
FIG. 6 is a block diagram of another embodiment of the computing device of FIG. 4.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: detecting the frame rate of a display picture in a display panel; determining a target overdrive value according to the frame rate of the display picture; and driving the display panel according to the target overdrive value.
According to the technical scheme, the frame rate of the display picture of the display panel is detected, when the frame rate of the display picture is changed, the target overdrive value is determined according to the frame rate of the display picture, the display panel is driven by the determined target overdrive value, and the display panel is guaranteed to have a high-quality display effect under different frame rates.
According to the technical scheme, the driving method of the display panel is applied to a driving device of the display panel, the driving device of the display panel is arranged in a system chip, namely calculation processing of an overdrive value is achieved in the system chip, and the system chip can be selected as an SOC chip and is a chip of an integrated circuit. The invention arranges the driving device of the display panel in the system chip, and stores the overdrive lookup table in the memory of the system chip by using the large-capacity memory of the system chip, thereby saving the storage space of the time schedule controller in the display device and reducing the cost of the time schedule controller. The driving device of the display panel comprises a frame rate detection device 20, a calculation device 30 and a storage device 40. Wherein the driving means of the display panel further comprise data processing means 50, such as RGB data processing means, and data conversion means 60, such as decoding ICs.
Based on the structure of the driving apparatus for a display panel, an embodiment of the driving method for a display panel according to the present invention is provided.
Referring to fig. 1, the method for driving the display panel includes the steps of:
step S1, detecting a frame rate of a display screen on the display panel 10;
the frame rate of the display screen represents the refresh frequency of the display screen, namely the refresh frequency of two frames before and after the display screen. By detecting the frame rate of the display picture, when the frame rate of the display picture changes, the system can adaptively adjust the overdrive value so as to ensure the quality of the display picture. In the present embodiment, the frame rate of the display screen is detected by the frame rate detection device 20 in the system chip.
Step S2, determining a target overdrive value according to the frame rate of the display picture;
the target overdrive value may be an overdrive gray scale value or an overdrive voltage value, and is used for driving the display panel, so that the display panel 10 displays corresponding gray scales. After the frame rate of the display screen is detected, the target overdrive value may be determined according to the frame rate of the display screen, for example, if the frame rate of the display screen is not changed, the corresponding overdrive value may be determined from an overdrive lookup table in a memory of the system chip. Specifically, referring to fig. 2, in an embodiment, the step S2 includes:
step S21, calculating a gain value according to the frame rate of the display picture;
the gain value is the ratio of the frame rate of the display picture to the preset frame rate. The preset frame rate is a normal frame rate of the display screen, that is, a refresh frequency before the change, for example, if the refresh frequency of the display screen is 60Hz before the change, the preset frame rate is 60Hz, and if the refresh frequency of the display screen is 50Hz before the change, the preset frame rate is 50 Hz. And calculating the ratio of the detected frame rate of the display picture to the preset frame rate to obtain the gain value. The gain value can be used to determine whether the frame rate of the display screen is high or low, and for example, if the normal refresh frequency of the display screen is 60Hz, and the detected refresh frequency of the display screen is also 60Hz, indicating that the refresh frequency of the display screen has not changed, the gain value is 1.
And step S22, determining a target overdrive value according to the gain value.
After obtaining the gain value, further, the calculation formula of the overdrive value can be used: determining a target overdrive value by gray _ newf _ od ═ (gray _ f _ od-gray _ cur) × gain + gray _ cur; the gray _ newf _ od is a target overdrive value, the gray _ f _ od is an overdrive value corresponding to a preset frame rate, the gray _ cur is a gray level value of the current frame, and the gain is a gain value.
Optionally, referring to fig. 3, in an embodiment, step S2 includes:
step S23, judging whether the frame rate of the display picture is consistent with a preset frame rate;
the embodiment is suitable for the case that the frame rate is not changed, and judges whether the frame rate of the display picture is changed by judging whether the frame rate of the display picture is consistent with the preset frame rate.
Step S24, when the frame rate of the display picture is consistent with a preset frame rate, acquiring an overdrive value corresponding to the preset frame rate from an overdrive lookup table;
the overdrive lookup table is a two-dimensional array with a start gray scale and a target gray scale as coordinates, and is used for providing an overdrive value, wherein in order to reduce the data size of the overdrive lookup table, the overdrive lookup table is not generally made into a full gray scale, but is made into equal intervals, such as 8 gray scale intervals, 16 gray scale intervals, 32 gray scale intervals and the like. When the frame rate of the display frame is consistent with the preset frame rate, the overdrive value corresponding to the preset frame rate can be determined from the overdrive lookup table in the memory of the system chip, and the operation is simple.
Step S25, the overdrive value is set as the target overdrive value.
The obtained overdrive value is used as the target overdrive value, i.e. the overdrive look-up table is run with the refresh frequency before the change.
After step S2, the method further includes:
step S2a, storing the target overdrive value in an overdrive lookup table.
In order to normally drive the display panel to work, after the target overdrive value is obtained, the target overdrive value is stored in the overdrive lookup table and is output after being compressed by the memory, so that the space of the memory is saved, and the cost of the memory is reduced.
Step S3, driving the display panel according to the target overdrive value.
The target overdrive value output BY the overdrive lookup table needs to be processed BY the RGB data processing device 50, and then the RGB data processing device 50 converts the RGB data and the target overdrive value into a signal in LVDS or V BY ONE format that can be recognized BY the timing controller after being processed BY the data conversion device 60, for example, a decoding IC, and sends the signal to the timing controller in the control circuit board 70, and the timing controller processes the received signal and converts the signal into a gray scale voltage required BY the display panel 10 to drive the display panel 10 to normally operate.
According to the technical scheme, by detecting the frame rate of the display picture of the display panel 10, when the frame rate of the display picture changes, the target overdrive value is determined according to the frame rate of the display picture, and the display panel 10 is driven by the determined target overdrive value, so that the problem of smear of the display picture of the display panel 10 can be effectively solved, and the display panel 10 is guaranteed to have a high-quality display effect at different frame rates; and the overdrive lookup table is stored in a memory of the system chip, so that the cost of the time schedule controller can be reduced, and the cost of the display device can be reduced.
The invention also provides a driving device of the display panel.
Referring to fig. 4, the driving apparatus of the display panel is disposed in a system chip, and the driving apparatus of the display panel includes:
a frame rate detection device 20 configured to detect a frame rate of a display screen in the display panel 10;
the frame rate of the display screen represents the refresh frequency of the display screen, namely the refresh frequency of two frames before and after the display screen. By detecting the frame rate of the display picture, when the frame rate of the display picture changes, the system can adaptively adjust the overdrive value so as to ensure the quality of the display picture. In the present embodiment, the frame rate of the display screen is detected by the frame rate detection device 20 in the system chip.
A computing device 30 configured to determine a target overdrive value according to a frame rate of the display screen, and to drive the display panel 10 according to the target overdrive value.
The target overdrive value may be an overdrive gray scale value or an overdrive voltage value, and is used for driving the display panel, so that the display panel 10 displays corresponding gray scales. After the frame rate of the display screen is detected, the target overdrive value may be determined according to the frame rate of the display screen, for example, if the frame rate of the display screen is not changed, the corresponding overdrive value may be determined from an overdrive lookup table in a memory of the system chip.
Optionally, referring to fig. 5, in an embodiment, the computing device 30 includes:
a gain value calculation device 301 configured to calculate a gain value according to a frame rate of the display screen;
the gain value is the ratio of the frame rate of the display picture to the preset frame rate. The preset frame rate is a normal frame rate of the display screen, that is, a refresh frequency before the change, for example, if the refresh frequency of the display screen is 60Hz before the change, the preset frame rate is 60Hz, and if the refresh frequency of the display screen is 50Hz before the change, the preset frame rate is 50 Hz. And calculating the ratio of the detected frame rate of the display picture to the preset frame rate to obtain the gain value. The gain value can be used to determine whether the frame rate of the display screen is high or low, and for example, if the normal refresh frequency of the display screen is 60Hz, and the detected refresh frequency of the display screen is also 60Hz, indicating that the refresh frequency of the display screen has not changed, the gain value is 1.
An overdrive value calculating means 302 configured to calculate a target overdrive value from the gain value.
After obtaining the gain value, further, the calculation formula of the overdrive value can be used: determining a target overdrive value by gray _ newf _ od ═ (gray _ f _ od-gray _ cur) × gain + gray _ cur; the gray _ newf _ od is a target overdrive value, the gray _ f _ od is an overdrive value corresponding to a preset frame rate, the gray _ cur is a gray level value of the current frame, and the gain is a gain value.
Optionally, referring to fig. 6, in an embodiment, the computing device 30 includes:
a determining device 303 configured to determine whether a frame rate of the display screen is consistent with a preset frame rate;
the embodiment is suitable for the case that the frame rate is not changed, and judges whether the frame rate of the display picture is changed by judging whether the frame rate of the display picture is consistent with the preset frame rate.
An obtaining device 304, configured to obtain an overdrive value corresponding to a preset frame rate from an overdrive lookup table when the frame rate of the display screen is consistent with the preset frame rate, and take the overdrive value as a target overdrive value.
The overdrive lookup table is a two-dimensional array with a start gray scale and a target gray scale as coordinates, and is used for providing an overdrive value, wherein in order to reduce the data size of the overdrive lookup table, the overdrive lookup table is not generally made into a full gray scale, but is made into equal intervals, such as 8 gray scale intervals, 16 gray scale intervals, 32 gray scale intervals and the like. And when the frame rate of the display picture is consistent with the preset frame rate, determining an overdrive value corresponding to the preset frame rate from an overdrive lookup table in a memory of the system chip. The obtained overdrive value is used as the target overdrive value, i.e. the overdrive look-up table is run with the refresh frequency before the change.
Wherein the driving device of the display panel further comprises:
a storage device 40 configured to store the target overdrive value to an overdrive look-up table.
In order to normally drive the display panel to work, after the target overdrive value is obtained, the target overdrive value is stored in the overdrive lookup table and is output after being compressed by the memory, so that the space of the memory is saved, and the cost of the memory is reduced.
The target overdrive value output BY the overdrive lookup table needs to be processed BY the RGB data processing device 50, and then the RGB data processing device 50 converts the RGB data and the target overdrive value into a signal in LVDS or V BY ONE format that can be recognized BY the timing controller after being processed BY the data conversion device 60, for example, a decoding IC, and sends the signal to the timing controller in the control circuit board 70, and the timing controller processes the received signal to become a gray scale voltage required BY the display panel 10 to drive the display panel 10 to normally operate.
According to the technical scheme, by detecting the frame rate of the display picture of the display panel 10, when the frame rate of the display picture changes, the target overdrive value is determined according to the frame rate of the display picture, and the display panel 10 is driven by the determined target overdrive value, so that the problem of smear of the display picture of the display panel 10 can be effectively solved, and the display panel 10 is guaranteed to have a high-quality display effect at different frame rates; and the overdrive lookup table is stored in a memory of the system chip, so that the cost of the time schedule controller can be reduced, and the cost of the display device can be reduced.
The invention also provides a display device, which comprises the display panel driving device, the system chip, the control circuit board 70 and the display panel 10, wherein the display panel driving device is arranged in the system chip, and the system chip and the display panel are both electrically connected with the control circuit board.
The specific working process is as follows: the overdrive apparatus of the display panel converts RGB data and configuration information, such as a target overdrive value, into a signal in LVDS or V BY ONE format that can be recognized BY the timing controller, and sends the signal to the timing controller in the control circuit board 70, and the timing controller processes the received signal to change the signal into a gray scale voltage required BY the display panel to drive the display panel to normally operate.
The display device of the embodiment may be a display device having a display panel, such as a television, a tablet computer, or a mobile phone. The display panel of the present embodiment may be any of the following: a liquid crystal display panel, an OLED display panel, a QLED display panel, a Twisted Nematic (TN) or Super Twisted Nematic (STN) type, an In-Plane Switching (IPS) type, a Vertical Alignment (VA) type, a curved panel, or other display panels.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A driving method of a display panel is applied to a driving device of the display panel, the driving device of the display panel is arranged in a system chip, and the driving method of the display panel comprises the following steps:
detecting the frame rate of a display picture in a display panel;
determining a target overdrive value according to the frame rate of the display picture; the method specifically comprises the following steps: calculating a gain value according to the frame rate of the display picture; the gain value is the ratio of the frame rate of a display picture to a preset frame rate; the preset frame rate is a refreshing frequency before the display frame changes; after the gain value is obtained, through the calculation formula of the overdrive value:
gray_newf_od＝(gray_f_od-gray_cur)*gain+gray_cur
determining a target overdrive value; the gray _ newf _ od is a target overdrive value, the gray _ f _ od is an overdrive value corresponding to a preset frame rate, the gray _ cur is a gray level value of the current frame, and the gain is a gain value;
and driving the display panel according to the target overdrive value.
2. The method of driving a display panel according to claim 1, wherein the step of determining a target overdrive value according to a frame rate of the display screen comprises:
judging whether the frame rate of the display picture is consistent with a preset frame rate or not;
when the frame rate of the display picture is consistent with a preset frame rate, acquiring an overdrive value corresponding to the preset frame rate from an overdrive lookup table; and
and taking the overdrive value as a target overdrive value.
3. The method for driving a display panel according to claim 1, wherein the step of determining the target overdrive value according to the frame rate of the display screen is followed by further comprising:
and storing the target overdrive value in an overdrive lookup table.
4. A driving apparatus of a display panel, the driving apparatus of the display panel being disposed in a system chip, the driving apparatus of the display panel comprising:
frame rate detection means configured to detect a frame rate of a display screen in the display panel;
a computing device configured to determine a target overdrive value according to a frame rate of the display screen, and drive a display panel according to the target overdrive value;
the computing device includes:
the gain value calculation device is configured to calculate a gain value according to the frame rate of the display screen, wherein the gain value is the value of the frame rate of the display screen and a preset frame rate; the preset frame rate is a refreshing frequency before the display frame changes;
overdrive value calculation means configured to calculate a target overdrive value from the gain value, the target overdrive value being calculated by the formula:
gray_newf_od＝(gray_f_od-gray_cur)*gain+gray_cur
the gray _ newf _ od is a target overdrive value, the gray _ f _ od is an overdrive value corresponding to a preset frame rate, the gray _ cur is a gray level value of the current frame, and the gain is a gain value.
5. The display panel driving apparatus according to claim 4, wherein the calculating means includes:
the judging device is configured to judge whether the frame rate of the display picture is consistent with a preset frame rate;
and the acquisition device is configured to acquire an overdrive value corresponding to a preset frame rate from an overdrive lookup table when the frame rate of the display screen is consistent with the preset frame rate, and take the overdrive value as a target overdrive value.
6. The driving apparatus of the display panel according to any one of claims 4 to 5, wherein the driving apparatus of the display panel further comprises:
a storage configured to store the target overdrive value to an overdrive lookup table.
7. A display device, comprising the driving device of the display panel as claimed in any one of claims 4 to 6, a system chip, a control circuit board, and a display panel, wherein the driving device of the display panel is disposed in the system chip, and the system chip and the display panel are both electrically connected to the control circuit board.
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| CN106205460B (en) * | 2016-09-29 | 2018-11-23 | 京东方科技集团股份有限公司 | Driving method, sequence controller and the display device of display device |
| CN107610665B (en) * | 2017-09-28 | 2020-07-28 | 深圳市华星光电技术有限公司 | Driving method and device of liquid crystal display |
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