CN107680525A - The driving method and display device of display device - Google Patents
The driving method and display device of display device Download PDFInfo
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- CN107680525A CN107680525A CN201710927268.3A CN201710927268A CN107680525A CN 107680525 A CN107680525 A CN 107680525A CN 201710927268 A CN201710927268 A CN 201710927268A CN 107680525 A CN107680525 A CN 107680525A
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- data voltage
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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
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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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The present invention discloses the driving method and display device of a kind of display device.Method includes obtaining the data voltage of current scan line and each pixel cell of lower one scan line;By lower one scan line to obtain comparative result compared with the data voltage of each pixel cell of current scan line;Similarity is obtained according to comparative result, and by it compared with predetermined threshold value;When similarity is more than or equal to predetermined threshold value, lower one scan line partly overlaps with the scanning signal that current scan line receives, the data voltage of current scan line enters line precharge to each pixel cell of lower one scan line, solves the problems, such as pixel cell undercharge with this, lifts display effect.
Description
Technical field
The present invention relates to display technology field, more particularly to the driving method and display device of a kind of display device.
Background technology
The scan drive circuit (as shown in Figure 1) of existing display device is worked long hours in saturation due to driving transistor T2
Area can cause threshold voltage shift, cause Display panel picture to produce brightness irregularities, influence display effect, to improve brightness not
Uniformly to lift the display effect of display panel, PWM (numerical digit driving) mode is suggested, and the butt formula such as subfield is currently used
PWM type of drive, this mode can suppress the brightness irregularities problem of display device, however existing PWM type of drive due to
The time that PWM driving scanning control chips open one-row pixels unit is only the 1/N of original analog voltage driving, and wherein N is
Bits numbers, as panel resolution increases, the opening time of one-row pixels unit can further compress, therefore be deposited in actual displayed
In pixel cell undercharge problem, display effect is influenceed.
The content of the invention
The present invention solves the technical problem of a kind of driving method and display device of display device is provided, to solve
Pixel cell undercharge problem, lift display effect.
In order to solve the above technical problems, one aspect of the present invention is:A kind of driving of display device is provided
Method, including:
Obtain the data voltage of each pixel cell corresponding to current scan line;
Obtain the data voltage of the corresponding each pixel cell of adjacent with the current scan line lower one scan line;
By the data voltage of each pixel cell corresponding to the lower one scan line each picture corresponding with current scan line
The data voltage of plain unit is compared, to obtain comparative result;
Similarity is obtained according to comparative result, and by the similarity compared with predetermined threshold value;And
When the similarity is more than or equal to the predetermined threshold value, scanning signal and institute that the lower one scan line receives
State the scanning signal that current scan line receives to partly overlap, the data electricity of each pixel cell corresponding to the current scan line
Pressure enters line precharge to each pixel cell corresponding to the lower one scan line.
In order to solve the above technical problems, one aspect of the present invention is:A kind of display device is provided, including:
Data driver, for output data voltage;
Scanner driver, for exporting scanning signal;
Comparison controller, for obtain the data voltage of each pixel cell corresponding to current scan line and obtain with it is described
The data voltage of each pixel cell corresponding to the adjacent lower one scan line of current scan line, and the lower one scan line is corresponding
Each pixel cell data voltage compared with the data voltage of each pixel cell corresponding to current scan line, to obtain
Comparative result is obtained, and similarity is obtained according to comparative result, and by the similarity compared with predetermined threshold value, in the phase
When being more than or equal to the predetermined threshold value like degree, scanning signal and the current scan line that the lower one scan line receives receive
To scanning signal partly overlap, the data voltage of each pixel cell corresponding to the current scan line is to the lower one scan
Each pixel cell enters line precharge corresponding to row.
The beneficial effects of the invention are as follows:It is different from the situation of prior art, display panel and display panel of the present invention
Driving method pass through the data voltage of each pixel cell corresponding to the lower one scan line is corresponding with current scan line
The data voltage of each pixel cell is compared to obtain comparative result, and obtains similarity according to comparative result, described
When similarity is more than or equal to predetermined threshold value, scanning signal and the current scan line that the lower one scan line receives receive
Scanning signal partly overlap, the data voltage of each pixel cell corresponding to the current scan line is to the lower one scan line
Corresponding each pixel cell enters line precharge, solves the problems, such as pixel cell undercharge with this, lifts display effect.
Brief description of the drawings
Fig. 1 is the circuit diagram of existing scan drive circuit;
Fig. 2 is existing PWM type of drive schematic diagram;
Fig. 3 is the waveform diagram of existing pixel cell undercharge;
Fig. 4 is the structural representation of the display device of the present invention;
Fig. 5 is the waveform diagram of the display device precharge of the present invention;
Fig. 6 is the schematic flow sheet of the driving method of display device of the present invention.
Embodiment
Referring to Fig. 1, it is the circuit diagram of existing scan drive circuit.Wherein, Data is data drive signal,
Gate1 is charging scanning signal, and controlling transistor T1 charges to A points, and Gate2 is discharge scanning signal, controlling transistor
T3 is discharged A points, and Vref is reference voltage, and two Gamma voltages, i.e. GM1 (most bright) and GM9 are exported at about zero, A points
(most dark) two voltage quasi positions, according to transistor current voltage I-V equations:
Ids, sat=k* (Vgs-Vth, T2)2=k* (VA-VB-Vth, T2)2
Wherein, Ids, sat are transistor T2 conducting electric currents, and k is the intrinsic conduction factor, and Vgs is transistor T2 grid source electrode electricity
Pressure, Vth are transistor T2 threshold voltage, and VA is A point voltages, and VB is B point voltages, because device degradation or nonuniformity are led
Cause the threshold voltage vt h of transistor variable quantity △ Vth smaller relative to (VA-VB) change, therefore relative analog voltage drives
Mode, PWM type of drive can suppress brightness irregularities problem.
Referring to Fig. 2, it is existing PWM type of drive schematic diagram.Wherein, x-axis is the time, and y-axis is the scanning of scan line
Time.One frame picture by etc. be cut into 8 time identical subfields, for example, SF1-SF8, by the time for controlling charge and discharge
Realize that pixel cell is different in the fluorescent lifetime of different subfields, the pixel cell fluorescent lifetime dutycycle of 8 subfields is respectively 1:
1、2:1、4:1、8:1、16:1、32:1、64:1、128:1, to produce PWM luminance signals, when being to the perception of brightness with reference to human eye
Between integral principle, PWM luminance signals can show different gray-scale intensity (255 GTGs).As shown in figure 3, when charging scanning letter
Number Gate1 is high level, i.e., when the corresponding scan line for receiving the charging scanning signal Gate1 is opened, A point voltages rose
Journey is to give electric capacity Cst charging processes, if scan line is opened the time, Tgate is too short, the electric capacity Cst undercharges, A points
Voltage can be less than data voltage, i.e. the luminous voltage of actual pixels unit is less than Gamma voltages GM1 (bright), influences display effect.
Referring to Fig. 4, it is the structural representation of the display device of the present invention.The display device includes data driver
10, for output data voltage;Scanner driver 20, for exporting scanning signal;Comparison controller 30, currently swept for obtaining
Retouch row (N scan lines) corresponding to each pixel cell data voltage and obtain it is adjacent with the current scan line under sweep
The data voltage of each pixel cell corresponding to row (N+1 scan lines) is retouched, and by each picture corresponding to the lower one scan line
The data voltage of plain unit compares knot compared with the data voltage of each pixel cell corresponding to current scan line, to obtain
Fruit, and similarity is obtained according to comparative result, and by the similarity compared with predetermined threshold value, be more than in the similarity
During equal to the predetermined threshold value, scanning that scanning signal that the lower one scan line receives receives with the current scan line
Signal section is overlapping, and the data voltage of each pixel cell corresponding to the current scan line is to corresponding to the lower one scan line
Each pixel cell enters line precharge.
When the similarity is less than the predetermined threshold value, the scanning signal that the lower one scan line receives is worked as with described
The scanning signal that preceding scan line receives is not overlapping, and the data voltage of each pixel cell will not corresponding to the current scan line
It is pre-charged each pixel cell corresponding to the lower one scan line.
Wherein, the comparison controller the data voltage of each pixel cell corresponding to the lower one scan line with it is current
When the data voltage of each pixel cell is identical corresponding to scan line, the first comparative result is obtained;The comparison controller is in institute
State the data of each pixel cell corresponding with current scan line of the data voltage of each pixel cell corresponding to lower one scan line
During voltage difference, the second comparative result is obtained.
Specifically, first comparative result is 1, and second comparative result is -1.
In the present embodiment, the arithmetic mean of instantaneous value of the comparison controller calculating comparative result is described similar to obtain
Degree.
Referring to Fig. 5, it is the waveform diagram of the display device precharge of the present invention.It is aobvious to the present invention with reference to Fig. 4 and Fig. 5
The precharge principles illustrated of showing device is as follows, wherein Current Scan behavior N scan lines, the adjacent current scan line it is next
Scanning behavior N+1 scan lines, N take natural number:
The time for exporting scanning signal Gate1_N+1 high level by increasing N+1 scan lines, that is, receive the scanning
Each pixel cell corresponding to signal Gate1_N+1 N+1 scan lines is opened the time so that what N scan lines received
The scanning signal Gate1_N+1 that scanning signal Gate1_N and N+1 scan lines receive overlaps region △ T, overlapping
Region, the data voltage of N scan lines can enter line precharge, such N+1 to each pixel cell corresponding to N+1 scan lines
There are increase, i.e. T ' gate in the actual charging interval of each pixel cell corresponding to scan line>Tgate, can so solve N+1 and sweep
Retouch the undercharge problem of each pixel cell corresponding to row.Specifically, current scan line is opened, that is, opens N scan lines, with
The data voltage for obtaining current scan line is DN, j, wherein j=1,2,3 ..., M, N expression Nth rows, total row of M expression display panels
Number (i.e. the sum of data voltage), the data voltage of lower one scan line is DN+1, j, compare N+1 scan lines and N scan lines be same
Whether the data voltage of one row (such as jth row) is identical, if the same αN+1,jTake 1;The α if differingN+1,jTake -1.
To the α of N+1 scan linesN+1Arithmetic mean of instantaneous value is asked to obtain similarity PN+1, it meets equation below:
Wherein, N represents Nth row, and M is total columns.
Work as PN+1During more than or equal to predetermined threshold value η, the data voltage similarity of N+1 scan lines and N scan lines is represented
Height, N+1 scanning line precharges enable control signal EN+1Equal to 1, then N+1 scan lines receive scanning signal and N are scanned
The scanning signal that row receives overlaps, and the data voltage of N+1 scan lines is to each pixel list corresponding to N+1 scan lines
Member enters line precharge.Work as PN+1During less than predetermined threshold value η, the data voltage similarity of N+1 scan lines and N scan lines is represented
Low, N+1 scanning line precharges enable control signal EN+1Equal to 0, then N+1 scan lines receive scanning signal and N are scanned
The scanning signal that row receives is not overlapping, and the data voltage of N+1 scan lines will not be to each pixel corresponding to N+1 scan lines
Unit enters line precharge.Wherein predetermined threshold value η chooses according to the actual requirements, typically may be set to 0, enables control signal EN+1It is full
Sufficient equation below:
Referring to Fig. 6, it is the schematic flow sheet of the driving method of display device of the present invention.Methods described includes step:
Step S1:Obtain the data voltage of each pixel cell corresponding to current scan line (N scan lines).
Step S2:Obtain the corresponding each picture of adjacent with the current scan line lower one scan line (N+1 scan lines)
The data voltage of plain unit.
Step S3:The data voltage of each pixel cell corresponding to the lower one scan line is corresponding with current scan line
The data voltage of each pixel cell is compared, to obtain comparative result.
Step S4:Similarity is obtained according to comparative result, and by the similarity compared with predetermined threshold value.
Step S5:When the similarity is more than or equal to the predetermined threshold value, scanning that the lower one scan line receives
The scanning signal that signal receives with the current scan line partly overlaps, each pixel cell corresponding to the current scan line
Data voltage line precharge is entered to each pixel cell corresponding to the lower one scan line.
Step S6:When the similarity is less than the predetermined threshold value, scanning signal that the lower one scan line receives
It is not overlapping with the scanning signal that the current scan line receives, the data of each pixel cell corresponding to the current scan line
Voltage will not be pre-charged each pixel cell corresponding to the lower one scan line.
Specifically, step S3 includes:
In the data voltage of each pixel cell corresponding to the lower one scan line each picture corresponding with current scan line
When the data voltage of plain unit is identical, the first comparative result is obtained;In each pixel cell corresponding to the lower one scan line
During the data voltage difference of data voltage each pixel cell corresponding with current scan line, the second comparative result is obtained.Specifically
Ground, first comparative result are 1, and second comparative result is -1.
Wherein, current scan line is opened, that is, N scan lines are opened, to obtain the data voltage of current scan line as DN, j,
Wherein j=1,2,3 ..., M, N represent Nth row, and M represents total columns (i.e. the sum of data voltage) of display panel, lower one scan
Capable data voltage is DN+1, j, compare N+1 scan lines and N scan lines same row (such as jth row) data voltage whether phase
Together, if the same αN+1,jTake 1;The α if differingN+1,jTake -1.
Specifically, step S4 includes:
The arithmetic mean of instantaneous value of the comparative result is calculated to obtain the similarity.
I.e. to the α of N+1 scan linesN+1Arithmetic mean of instantaneous value is asked to obtain similarity PN+1, it meets equation below:
Wherein, N represents Nth row, and M is total columns.
Work as PN+1During more than or equal to predetermined threshold value η, the data voltage similarity of N+1 scan lines and N scan lines is represented
Height, N+1 scanning line precharges enable control signal EN+1Equal to 1, then N+1 scan lines receive scanning signal and N are scanned
The scanning signal that row receives overlaps, and the data voltage of N+1 scan lines is to each pixel list corresponding to N+1 scan lines
Member enters line precharge.Work as PN+1During less than predetermined threshold value η, the data voltage similarity of N+1 scan lines and N scan lines is represented
Low, N+1 scanning line precharges enable control signal EN+1Equal to 0, then N+1 scan lines receive scanning signal and N are scanned
The scanning signal that row receives is not overlapping, and the data voltage of N+1 scan lines will not be to each pixel corresponding to N+1 scan lines
Unit enters line precharge.Wherein predetermined threshold value η chooses according to the actual requirements, typically may be set to 0, enables control signal EN+1It is full
Sufficient equation below:
The driving method of the display panel and display panel is by by each pixel list corresponding to the lower one scan line
Member data voltage compared with the data voltage of each pixel cell corresponding to current scan line to obtain comparative result, and
Similarity, when the similarity is more than or equal to predetermined threshold value, what the lower one scan line received are obtained according to comparative result
The scanning signal that scanning signal receives with the current scan line partly overlaps, each pixel corresponding to the current scan line
The data voltage of unit enters line precharge to each pixel cell corresponding to the lower one scan line, and solving pixel cell with this fills
Problem that electricity is insufficient, lifts display effect.
Embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this
The equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, it is included within the scope of the present invention.
Claims (10)
1. a kind of driving method of display device, it is characterised in that the driving method includes:
Obtain the data voltage of each pixel cell corresponding to current scan line;
Obtain the data voltage of the corresponding each pixel cell of adjacent with the current scan line lower one scan line;
By the data voltage of each pixel cell corresponding to the lower one scan line each pixel list corresponding with current scan line
The data voltage of member is compared, to obtain comparative result;
Similarity is obtained according to comparative result, and by the similarity compared with predetermined threshold value;And
When the similarity is more than or equal to the predetermined threshold value, the scanning signal that the lower one scan line receives is worked as with described
The scanning signal that preceding scan line receives partly overlaps, the data voltage pair of each pixel cell corresponding to the current scan line
Each pixel cell corresponding to the lower one scan line enters line precharge.
2. the driving method of display device according to claim 1, it is characterised in that described that phase is obtained according to comparative result
Like degree, and by the similarity compared with predetermined threshold value the step of after also include:
When the similarity is less than the predetermined threshold value, the scanning signal that the lower one scan line receives currently is swept with described
Retouch that the scanning signal that receives of row is not overlapping, and the data voltage of each pixel cell will not preliminary filling corresponding to the current scan line
Each pixel cell corresponding to the electricity lower one scan line.
3. the driving method of display device according to claim 1, it is characterised in that described by the lower one scan line pair
The data voltage for each pixel cell answered compared with the data voltage of each pixel cell corresponding to current scan line, with
Comparative result is obtained, including:
In the data voltage of each pixel cell corresponding to the lower one scan line each pixel list corresponding with current scan line
When the data voltage of member is identical, the first comparative result is obtained;In the data of each pixel cell corresponding to the lower one scan line
During the data voltage difference of voltage each pixel cell corresponding with current scan line, the second comparative result is obtained.
4. the driving method of display device according to claim 3, it is characterised in that first comparative result is 1, institute
The second comparative result is stated as -1.
5. the driving method of display device according to claim 1, it is characterised in that described that phase is obtained according to comparative result
Like degree, and by the similarity compared with predetermined threshold value, including:
The arithmetic mean of instantaneous value of the comparative result is calculated to obtain the similarity.
6. a kind of display device, it is characterised in that the display device includes:
Data driver, for output data voltage;
Scanner driver, for exporting scanning signal;
Comparison controller, for obtain the data voltage of each pixel cell corresponding to current scan line and obtain with it is described current
The data voltage of each pixel cell corresponding to the adjacent lower one scan line of scan line, and will be every corresponding to the lower one scan line
The data voltage of one pixel cell is compared with the data voltage of each pixel cell corresponding to current scan line, to obtain ratio
Relatively result, and similarity is obtained according to comparative result, and by the similarity compared with predetermined threshold value, in the similarity
During more than or equal to the predetermined threshold value, what scanning signal that the lower one scan line receives received with the current scan line
Scanning signal partly overlaps, and the data voltage of each pixel cell corresponding to the current scan line is to the lower one scan line pair
The each pixel cell answered enters line precharge.
7. display device according to claim 6, it is characterised in that when the similarity is less than the predetermined threshold value,
The scanning signal that the lower one scan line receives and the scanning signal that the current scan line receives be not overlapping, described current
The data voltage of each pixel cell corresponding to scan line will not be pre-charged each pixel cell corresponding to the lower one scan line.
8. display device according to claim 6, it is characterised in that the comparison controller is in the lower one scan line pair
When the data voltage for each pixel cell answered is identical with the data voltage of each pixel cell corresponding to current scan line, obtain
First comparative result;The comparison controller is in the data voltage of each pixel cell corresponding to the lower one scan line and currently
During the data voltage difference of each pixel cell corresponding to scan line, the second comparative result is obtained.
9. display device according to claim 8, it is characterised in that first comparative result is 1, and described second compares
As a result it is -1.
10. display device according to claim 6, it is characterised in that the comparison controller calculates the comparative result
Arithmetic mean of instantaneous value to obtain the similarity.
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CN201710927268.3A CN107680525B (en) | 2017-09-30 | 2017-09-30 | Display device driving method and display device |
PCT/CN2017/112446 WO2019061763A1 (en) | 2017-09-30 | 2017-11-23 | Display device driving method and display device |
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