CN108694922A - Common voltage driving method, device and display device - Google Patents
Common voltage driving method, device and display device Download PDFInfo
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- CN108694922A CN108694922A CN201810285971.3A CN201810285971A CN108694922A CN 108694922 A CN108694922 A CN 108694922A CN 201810285971 A CN201810285971 A CN 201810285971A CN 108694922 A CN108694922 A CN 108694922A
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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
- G09G3/3696—Generation of voltages supplied to electrode drivers
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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
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a kind of common voltage driving methods, including:Control signal is generated according to the picture state for detecting current display picture default sampling period, and according to the picture state of current display picture;Exchange common voltage or direct current common voltage are generated according to the control signal.The present invention also provides a kind of common voltage driving device and display devices to generate AC DC common voltage when currently display picture is dynamic menu according to the picture state for detecting current display picture default sampling period according to control signal;In currently display picture to maintain the liquid crystal positive and negative anodes balance of voltage according to control signal generation exchange common voltage when tableaux, to make liquid crystal be not in polarization situation, improve ghost phenomena.
Description
Technical field
The invention belongs to field of display, are filled more particularly, to a kind of common voltage driving method, device and display
It sets.
Background technology
Liquid crystal display device (LCD, Liquid Crystal Display) has light and short, low power consumption and low in calories etc.
Advantage makes liquid crystal display device show one's talent in numerous different types of display devices, is widely used, such as applies and calculating
Machine, mobile phone and personal digital assistant etc. modernize on information equipment.
Liquid crystal display device is the light generated by the driving voltage applied to the liquid crystal molecule on liquid crystal display device
It learns response, i.e. gray scale response and images, gray scale response refers to the classification of driving voltage, due to liquid crystal molecule material self character
Limitation, imaging need to occupy the most of the time of a frame.Therefore, liquid crystal display device is after showing a certain picture for a long time,
When being switched to next picture, viewer, since a upper picture is not eliminated in time, causes and current picture when seeing current picture
There is imaging to be overlapped, to influence the quality for the picture that viewer is seeing, this is thus referred to as image residue (Image
Sticking) phenomenon.
The picture residual image one of the main reasons of liquid crystal display device is in the liquid crystal molecule in liquid crystal display device
It is mixed with ionic organic impurities, induces DC voltage.Ionic organic impurities in liquid crystal molecule can be inhaled under the induction of electric field
It is attached in the array substrate or colored filter substrate of liquid crystal display device, the induction field itself generated influences liquid crystal in turn
The normal voltage at molecule both ends prevents liquid crystal molecule by electric field action from normal orientation, to influence the correctness of imaging.
Fig. 1 is the array substrate schematic diagram of the liquid crystal display device of the prior art, as shown in Figure 1, the array substrate includes
The scan line 110 arranged along the horizontal direction of substrate;The data line 120 arranged along the vertical direction of substrate, data line and scanning
Line square crossing arranges;It is intersected the pixel unit 101 formed by the scan line 110 and the data line 120, pixel list
Member 101 includes pixel electrode 102 and thin film transistor (TFT) 103 (Thin Film Transistor, abbreviation TFT).Wherein, film is brilliant
The grid of body pipe 103 is electrical connected with scan line 110, and source electrode is electrical connected with data line 120, drain electrode and 102 electricity of pixel electrode
Property be connected, and each scan line and the grid of each thin film transistor (TFT) 103 of corresponding row are connected, each data line with it is corresponding
The source electrode of each thin film transistor (TFT) 103 of row is connected.
When the liquid crystal display device works, each film for sending scanning signal to corresponding row respectively using scan line 110 is brilliant
Body pipe 103, control thin film transistor (TFT) 103 are turned on and off line by line;And when thin film transistor (TFT) 103 is in open state, data
Data-signal on line 120 can add to the pixel electrode of the pixel unit 101 via the source electrode and drain electrode of thin film transistor (TFT) 103
On 102.Pass through the rotation for the electric field controls liquid crystal molecule that the public electrode on pixel electrode 102 and colored filter substrate is formed
Turn, to realize that image is shown.
In the liquid crystal display panel of liquid crystal display device, there are mainly three types of voltages, respectively gate drive voltage, source electrode
Driving voltage and public electrode voltages.Wherein, gate drive voltage is used to control the grid of thin film transistor (TFT) in pixel unit 101
Pole;Source drive voltage is used to drive the source electrode of thin film transistor (TFT) in pixel unit 101;In array substrate and colorized optical filtering chip base
There is public electrode on plate, and be electrically connected, the public electrode in array substrate is used to form storage electricity with pixel electrode 102
Hold, the public electrode on colored filter substrate is used to form liquid crystal capacitance with pixel electrode 102.Public electrode voltages are by liquid crystal
The public electrode voltages module of display device provides, and public electrode voltages module provides for liquid crystal display device when showing picture
Public electrode voltages, the public electrode voltages are expressed as VCOM.
Wherein, public electrode voltages VCOM is for maintaining the liquid crystal positive and negative anodes balance of voltage, when the positive and negative pole tension of liquid crystal loses
When going balance, it can cause to form bias voltage between each pixel electrode 102 and each public electrode, the larger area of bias voltage
Domain just will appear liquid crystal polarization phenomenon, cause ghost (Image Sticking, IS) phenomenon.
In the prior art, public electrode voltages are direct current common voltage (DCVCOM), when it is dynamic menu to show picture,
Liquid crystal voltage is to maintain the liquid crystal positive and negative anodes balance of voltage in variation, be not in polarization phenomena.When display picture is static draws
When face, liquid crystal voltage maintains always same voltage value, if public electrode voltages are also fixed, power supply for a long time can lead to liquid
Crystalline substance polarization, causes ghost phenomena.In order to improve ghost phenomena, debugging DCVCOM is generally gone to maintain liquid crystal positive and negative anodes as much as possible
The balance of voltage, but it is ineffective.And in the case where debugging in poor shape, also to go to handle by reducing specification control,
Ghost is not solved the problems, such as fundamentally.
Invention content
The purpose of the present invention is to provide a kind of common voltage driving method, device and display devices.
According to the first aspect of the invention, a kind of common voltage driving method is provided, including:It is detectd according to default sampling period
The picture state of current display picture is surveyed, and control signal is generated according to the picture state of the current display picture;According to institute
It states control signal and generates exchange common voltage or direct current common voltage.
Preferably, the basis presets detecting sampling period and currently shows that the picture state of picture includes:According to described pre-
If reading the current sample period sampling period to show the image information of picture and show the image letter of picture a upper sampling period
Breath;The image information and the image for showing picture a upper sampling period for comparing the current sample period display picture are believed
Breath obtains the current sample period display picture and the image similarity for showing picture a upper sampling period;When described
When image similarity is more than pre-set image similarity, the current display picture is tableaux;When described image similarity is small
When the pre-set image similarity, the current display picture is dynamic menu.
Preferably, when the current display picture is tableaux, exchange common electrical is generated according to the control signal
Pressure;When the current display picture is dynamic menu, direct current common voltage is generated according to the control signal.
Preferably, when the current display picture is tableaux, the control signal is low level;When described current
When showing that picture is dynamic menu, the control signal is high level.
According to the second aspect of the invention, a kind of common voltage driving device is provided, including:Sequence controller is used for root
It is generated according to the picture state for detecting current display picture default sampling period, and according to the picture state of the current display picture
Control signal;Common voltage generation module, for generating exchange common voltage or direct current common voltage according to the control signal.
Preferably, the sequence controller includes:Reading unit, for all according to reading sampling period current sample is preset
Phase shows the image information of picture and shows the image information of picture a upper sampling period;Image similarity unit compares institute
The image information that the current sample period showed the image information and the display upper sampling period picture of picture is stated, described in acquisition
The current sample period shows picture and the image similarity for showing picture a upper sampling period;Show that picture state detecting is single
Member, for when described image similarity is more than pre-set image similarity, the current display picture to be tableaux;When described
When image similarity is less than the pre-set image similarity, the current display picture is dynamic menu;Control unit is used for root
The control signal is generated according to the picture state of current display picture.
Preferably, when the current display picture is tableaux, it is public that the common voltage generation module generates exchange
Common voltage;When the current display picture is dynamic menu, the common voltage generation module generates direct current common voltage.
Preferably, when the current display picture is tableaux, the control signal is low level;When described current
When showing that picture is dynamic menu, the control signal is high level.
Preferably, the common voltage generation module includes:
First common voltage generates unit, for generating exchange common voltage according to the control signal;
Second common voltage generates unit, for generating direct current common voltage according to the control signal.
According to the third aspect of the invention we, a kind of display device, including common voltage as described above driving dress are provided
It sets.
Common voltage driving method, device and display device provided in an embodiment of the present invention, are detectd according to default sampling period
The picture state for surveying current display picture generates AC DC public affairs when current display picture is dynamic menu according to control signal
Common voltage;In currently display picture liquid crystal positive and negative anodes are maintained to generate exchange common voltage according to control signal when tableaux
The balance of voltage improves ghost phenomena to make liquid crystal be not in polarization situation.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 shows the array substrate schematic diagram of liquid crystal display device in the prior art;
Fig. 2 shows the flow charts of the common voltage driving method of offer according to embodiments of the present invention;
Fig. 3 shows the flow chart of the step S10 provided according to embodiments of the present invention;
Fig. 4 shows the signal waveforms provided according to embodiments of the present invention;
Fig. 5 shows the structural schematic diagram of the common voltage driving device provided according to embodiments of the present invention.
Specific implementation mode
Hereinafter reference will be made to the drawings is more fully described various embodiments of the present invention.In various figures, identical element
It is indicated using same or similar reference numeral.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.
The present invention can be presented in a variety of manners, some of them example explained below.
Fig. 2 shows the flow charts of the common voltage driving method of offer according to embodiments of the present invention.As shown in Fig. 2, institute
Common voltage driving method is stated to include the following steps.
In step slo, according to the picture state for detecting current display picture default sampling period, and according to current display
The picture state of picture generates control signal.
In the present embodiment, the picture state of current display picture is detected by sequence controller.Wherein, sampling week is preset
Phase T is according to the actual use demand preset image information sample time.Specifically, every default T sampling period,
Sequence controller reads the image information for showing picture from system video card or external host, and the current sample period is read
Image information is compared with the image information read a upper sampling period to judge the picture state of current display picture, works as institute
When to state current display picture be tableaux, the control signal SW-Ctrl is low level;When the current display picture is
When state picture, the control signal SW-Ctrl is high level.
As shown in figure 3, step S10 specifically includes following steps.
In step S101, according to default sampling period read the current sample period show picture image information and on
One sampling period showed the image information of picture.
In the present embodiment, sequence controller is worked as according to default T sampling period from system video card or external host reading
It shows the image information of picture preceding sampling period and shows image information and the storage of picture a upper sampling period.
In step s 102, the current sample period showed the image information of picture and a upper sampling period
Show the image information of picture.
In the present embodiment, the current sample period was shown the image information of picture and a upper sampling period by sequence controller
The image information of display picture is compared, and is calculated current sample period display picture and shown picture with a upper sampling period
Image similarity S.
In step s 103, when described image similarity S is more than pre-set image similarity S0, the current display picture
For tableaux;When described image similarity S is less than the pre-set image similarity S0, the current display picture is dynamic
Picture.
In the present embodiment, by the image similarity S being calculated compared with pre-set image similarity S0, if S > S0,
Then currently display picture is tableaux, and the control signal SW-Ctrl of generation is low level.It is current to show picture if S < S0
Face is dynamic menu, and the control signal SW-Ctrl of generation is high level.
In step S104, control signal is generated according to the picture state of current display picture.
In the present embodiment, if currently display picture is tableaux, the control signal SW-Ctrl of generation is low level.
If currently display picture is dynamic menu, the control signal SW-Ctrl of generation is high level.
In step S20, exchange common voltage or direct current common voltage are generated according to the control signal.
In the present embodiment, as shown in figure 4, (showing the state of picture when the current display picture is tableaux
Indicated by display data Display Data), control signal SW-Ctrl is low level (L), then according to control signal SW-Ctrl
Generate exchange common voltage ACVCOM;When the current display picture is dynamic menu, control signal SW-Ctrl is high level
(H), then direct current common voltage DCVCOM is generated according to control signal SW-Ctrl.Final common voltage Vcom is according to control
Signal forms direct current common voltage DCVCOM with common voltage ACVCOM superpositions are exchanged.
The common voltage driving method of display panel provided in an embodiment of the present invention, it is current according to detecting default sampling period
The picture state for showing picture generates AC DC common electrical when currently display picture is dynamic menu according to control signal
Pressure;In currently display picture liquid crystal positive and negative anodes voltage is maintained to generate exchange common voltage according to control signal when tableaux
Balance improves ghost phenomena to make liquid crystal be not in polarization situation.
Fig. 5 shows the structural schematic diagram of the common voltage driving device provided according to embodiments of the present invention.Such as Fig. 5 institutes
Show, the common voltage driving device, including sequence controller 510 and common voltage generation module 520.
Wherein, sequence controller 510 is used for according to the picture state for presetting the current display picture of detecting sampling period, and root
Control signal is generated according to the picture state of current display picture.
In the present embodiment, sequence controller 510 detects the picture shape of current display picture according to default T sampling period
State.Wherein, it is according to the actual use demand preset image information sample time to preset T sampling period.Specifically, every
One default T sampling period, sequence controller read current sample period display picture from system video card or external host
Image information and the image information for showing picture a upper sampling period, and to the image information of current sample period reading
It is compared with the image information read a upper sampling period to judge the picture state of the current display picture.Work as institute
When to state current display picture be tableaux, the control signal SW-Ctrl is low level;When the current display picture is
When state picture, the control signal SW-Ctrl is high level.
Specifically, sequence controller 510 includes reading unit 511, image similarity unit 512, shows that picture state is detectd
Survey unit 513 and control unit 514.
Reading unit 511 be used for according to preset sampling period read the current sample period show picture image information and
A upper sampling period shows the image information of picture.
In the present embodiment, sequence controller is worked as according to default T sampling period from system video card or external host reading
It shows the image information of picture preceding sampling period and shows image information and the storage of picture a upper sampling period.
The 512 current sample period of image similarity unit shows the image information of picture and a upper sampling
Period shows the image information of picture, obtains the current sample period display picture and showed picture with a upper sampling period
Image similarity.
The current sample period was shown the figure of the image information and display upper sampling period picture of picture by sequence controller
As information is compared, and calculates the current sample period and show that picture showed the image similarity of picture with a upper sampling period
S。
Show that the image similarity of picture is more than when the current sample period is calculated in display picture state detecting unit 513
When pre-set image similarity, the current display picture is tableaux;When display picture state detecting unit 513 is calculated
When the current sample period shows that the image similarity of picture is less than pre-set image similarity, the current display picture is dynamic picture
Face.
In the present embodiment, by the image similarity S being calculated compared with pre-set image similarity S0, if S > S0,
Then currently display picture is tableaux, current to show that picture is dynamic menu if S < S0.
Control unit 514 is used to generate control signal according to the picture state of current display picture.
In the present embodiment, if currently display picture is tableaux, the control signal SW-Ctrl of generation is low level.
If currently display picture is dynamic menu, the control signal SW-Ctrl of generation is high level.
Common voltage generation module 520 is used to generate exchange common voltage or direct current common voltage according to control signal.
In the present embodiment, when the current display picture is tableaux, control signal SW-Ctrl is low level,
Then common voltage generation module 520 generates exchange common voltage ACVCOM according to control signal SW-Ctrl;When the current display
When picture is dynamic menu, control signal SW-Ctrl is high level, then common voltage generation module 520 is according to control signal SW-
Ctrl generates direct current common voltage DCVCOM.
The common voltage generation module 520 includes that the first common voltage generates unit 521 and the generation of the second common voltage
Unit 522.Wherein, the first common voltage generates unit 521 and is used to generate exchange common voltage according to control signal;Second is public
Voltage generating unit 522 is used to generate direct current common voltage according to control signal.
Common voltage driving method, device and the display device of display panel provided in an embodiment of the present invention, according to default
The picture state of the current display picture of detecting sampling period, generates when currently display picture is dynamic menu according to control signal
AC DC common voltage;It is maintained in currently display picture to generate exchange common voltage according to control signal when tableaux
The liquid crystal positive and negative anodes balance of voltage improves ghost phenomena to make liquid crystal be not in polarization situation.
The present invention also provides a kind of display devices, including display panel and common voltage as described above driving dress
It sets, the common voltage driving device provides exchange common voltage or direct current common voltage for display panel.
As described above according to the embodiment of the present invention, there is no all details of detailed descriptionthe for these embodiments, also not
Limit the specific embodiment that the invention is only described.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is in order to preferably explain the principle of the present invention and practical application, belonging to making
Technical field technical staff can utilize modification of the invention and on the basis of the present invention to use well.The protection model of the present invention
The range that the claims in the present invention are defined should be subject to by enclosing.
Claims (10)
1. a kind of common voltage driving method, which is characterized in that including:
According to the picture state for detecting current display picture default sampling period, and according to the picture shape of the current display picture
State generates control signal;
Exchange common voltage or direct current common voltage are generated according to the control signal.
2. common voltage driving method according to claim 1, which is characterized in that the basis presets detecting sampling period
It is current to show that the picture state of picture includes:
Showed that the image information of picture and a upper sampling period were aobvious according to the current sample period is read the default sampling period
Show the image information of picture;
The image information and the image for showing picture a upper sampling period for comparing the current sample period display picture are believed
Breath obtains the current sample period display picture and the image similarity for showing picture a upper sampling period;
When described image similarity is more than pre-set image similarity, the current display picture is tableaux;
When described image similarity is less than the pre-set image similarity, the current display picture is dynamic menu.
3. common voltage driving method according to claim 2, which is characterized in that
When the current display picture is tableaux, exchange common voltage is generated according to the control signal;
When the current display picture is dynamic menu, direct current common voltage is generated according to the control signal.
4. common voltage driving method according to claim 3, which is characterized in that when the current display picture is static state
When picture, the control signal is low level;
When the current display picture is dynamic menu, the control signal is high level.
5. a kind of common voltage driving device, which is characterized in that including:
Sequence controller, for the picture state according to the default current display picture of detecting sampling period, and according to described current
Show that the picture state of picture generates control signal;
Common voltage generation module, for generating exchange common voltage or direct current common voltage according to the control signal.
6. common voltage driving device according to claim 5, which is characterized in that the sequence controller includes:
Reading unit, for according to read the default sampling period current sample period show picture image information and
One sampling period showed the image information of picture;
Image similarity unit, the current sample period showed that the image information of picture and a upper sampling period were aobvious
The image information for showing picture obtains the current sample period display picture and the image for showing picture a upper sampling period
Similarity;
It shows picture state detecting unit, is used for when described image similarity is more than pre-set image similarity, it is described current aobvious
Show that picture is tableaux;When described image similarity is less than the pre-set image similarity, the current display picture is
Dynamic menu;
Control unit, for generating the control signal according to the picture state of current display picture.
7. common voltage driving device according to claim 6, which is characterized in that when the current display picture is static state
When picture, the common voltage generation module generates exchange common voltage;
When the current display picture is dynamic menu, the common voltage generation module generates direct current common voltage.
8. common voltage driving device according to claim 7, which is characterized in that when the current display picture is static state
When picture, the control signal is low level;
When the current display picture is dynamic menu, the control signal is high level.
9. common voltage driving device according to claim 7, which is characterized in that the common voltage generation module packet
It includes:
First common voltage generates unit, for generating exchange common voltage according to the control signal;
Second common voltage generates unit, for generating direct current common voltage according to the control signal.
10. a kind of display device, which is characterized in that public including display panel and as described in any one of claim 5-9
Voltage driver;
Wherein, the common voltage driving device provides exchange common voltage or direct current common voltage to the display panel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810285971.3A CN108694922B (en) | 2018-04-03 | 2018-04-03 | Common voltage driving method and device and display device |
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|---|---|---|---|
| CN201810285971.3A CN108694922B (en) | 2018-04-03 | 2018-04-03 | Common voltage driving method and device and display device |
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| CN108694922B CN108694922B (en) | 2020-11-03 |
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| CN113689815A (en) * | 2021-08-23 | 2021-11-23 | Tcl华星光电技术有限公司 | Drive circuit and display device |
| CN113948050A (en) * | 2021-10-25 | 2022-01-18 | 福州京东方光电科技有限公司 | Display screen voltage adjusting method, display and electronic equipment |
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| CN108694922B (en) | 2020-11-03 |
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