CN106128374A - Non-time-sharing touch and display embedded liquid crystal display and driving method thereof - Google Patents
Non-time-sharing touch and display embedded liquid crystal display and driving method thereof Download PDFInfo
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- 235000003140 Panax quinquefolius Nutrition 0.000 claims description 2
- 235000008434 ginseng Nutrition 0.000 claims description 2
- 230000003071 parasitic effect Effects 0.000 description 10
- 239000010409 thin film Substances 0.000 description 9
- 230000005611 electricity Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000007306 turnover Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000023320 Luma <angiosperm> Species 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
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- OSWPMRLSEDHDFF-UHFFFAOYSA-N methyl salicylate Chemical compound COC(=O)C1=CC=CC=C1O OSWPMRLSEDHDFF-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses an embedded liquid crystal display with non-time-sharing touch and display and a driving method thereof. A non-time touch and display driving method applied to an embedded liquid crystal display is provided, which is used for detecting a common electrode plate to judge whether an object touches the embedded liquid crystal display or not while applying pixel voltage to pixels to display an image. The driving method of the invention does not need to carry out time-sharing processing on display and touch control, so that the embedded liquid crystal display with high resolution can have sufficient display time and touch control detection time.
Description
Technical field
The present invention is relevant a kind of embedded liquid crystal display, especially with regard to a kind of overstepping one's bounds time touch-control and display embedded
Formula liquid crystal display and overstepping one's bounds time touch-control and display drive method.
Background technology
Fig. 1 shows known liquid crystal display (LCD), and it utilizes low-voltage differential signal to transmit (Low-Voltage
Differential Signaling；LVDS) circuit 10 by from pen electricity frame data be sent to LCD control special integrated
Circuit (application Specific Integrated Circuit；ASIC) 14 or utilize the LCD control circuit 12 will be from
The frame data of desktop computer are sent to LCD and control ASIC 14, LCD control ASIC 14 according to frame data control
Multiple gate drivers 18 and 20 and multiple source electrode driver 22 and 24, LCD 26 has a plurality of grid
Driving line and a plurality of source drive line, gate drivers 18 and 20 rises according to the frame controlling ASIC 14 from LCD
Beginning signal STV starts to be sequentially driven a plurality of raster data model line, and source electrode driver 22 and 24 is according to from LCD control
Luma data GSD of ASIC 14 applies voltages to the multiple pixel electrodes coupled on powered raster data model line,
To determine the GTG of powered pixel, wherein frame start signal STV represents and starts to show next frame, with reference to electricity
Pressure generator 16 provides reference voltage to multiple gate drivers 18 and 20 and multiple source electrode driver 22 and 24
With the voltage in the multiple gate drivers of calibration 18 and 20 and multiple source electrode driver 22 and 24.
The liquid crystal display of combination of touch control and display function about can be divided into two kinds at present, and the first is in LCD 26
Upper increase by contact panel reaches touch controllable function, and the second is then embedded touch control function in LCD 26.
Although embedded liquid crystal display is increased without contact panel just can reach touch controllable function, but in order to avoid display
Image interferes with each other with touch-control sensing, therefore display time-sharing operation required with touch controllable function.Assume the LCD face of Fig. 1
The resolution of plate 26 is 1920 × 1080, and frame turnover rate (frame rate) is 60Hz, i.e. LCD 26 is per second aobvious
Showing 60 frames, in other words, each frame has the time of 16.7ms.Waveform 28 institute such as the gate drive signal of Fig. 2
Showing, in the case of LCD 26 is not bound with touch controllable function, the time almost all of 16.7ms is used for showing
Image.As shown in the waveform 30 of gate drive signal of Fig. 2 and the waveform 32 of touch sense signals, in LCD face
After plate 26 combination of touch control function, in the time of 16.7ms, the time of only 10ms is used for showing image, remaining 6.7ms
It is used to perform touch-control sensing.
Fig. 3 show touch-control known to one and display time-sharing method, its be first show image after carry out touch-control sensing again.
Drive signal Out1-Out1080 a plurality of to drive as it is shown on figure 3, multiple gate drivers 18 and 20 are sequentially sent
Raster data model line to show image, and the last item raster data model line complete drive after to again driving Article 1 grid to drive
Vertical blank (V-blanking) time of moving-wire carries out touch-control sensing.Fig. 4 is touch-control known to the second and display point
Shi Fangfa, this mode is to shorten each driving time driving signal Out1-Out1080 so that adjacent driving is believed
A horizontal blank (H-blanking) time is had to be available for carrying out touch-control sensing between number.Fig. 5 shows known to the third tactile
Control and display time-sharing method, it shortens each driving time driving signal Out1-Out1080 equally, but connects
Continue after sending several driving signal Out1, Out2, Out3, insert a long horizontal blank (long H-blanking) time
For touch-control sensing, wherein this long horizontal blank time is equal to several driving signal Out1, Out2, the Out3 sent continuously
The sum total of the time being shortened.
It is well known, however, that touch-control and display time-sharing method cannot use in the LCD of high-res.With 60Hz
Frame turnover rate example, each frame has the time of 16.7ms, when therefore the resolution of LCD 26 is 1024 × 768,
Every raster data model line is up to the driving time of 16.7ms/768=21.7 μ s.When the resolution of LCD 26 is
When 1920 × 1080, every raster data model line is up to the driving time of 16.7ms/1080=15.4 μ s.When LCD face
When the resolution of plate 26 is 4K × 2K, every raster data model line is up to the driving time of 16.7ms/2K=8.3 μ s.
It is to say, along with the increase of resolution, the driving time of every raster data model line and then reduces, and therefore resolves at height
In the LCD 26 of degree, the driving time of every raster data model line is the most not enough, it is impossible to separate the time again
Reach touch-control sensing.
In LCD 26, also include battery lead plate altogether, common-battery pole plate have altogether electrode voltage Vcom as ginseng
Examine current potential, when the voltage being applied to pixel electrode is more than common electrode voltage Vcom, be considered as positive polarity voltage, when executing
When being added in the voltage of pixel electrode less than common electrode voltage Vcom, it is considered as reverse voltage.In two successive frames, phase
The opposite polarity of the pixel of co-located, to avoid PI (polyimide) polymer substance to maintain identical voltage for a long time,
Forming permanently-polarised makes liquid crystal molecule to rotate.Common electrode voltage Vcom can be DC voltage can also be exchange
Voltage, Fig. 6 shows the driving method of direct current common electrode voltage, and wherein common electrode voltage Vcom is fixed voltage, source
Pole drive the voltage V0+ on line, V1+, V2+, V3+, V4+, V5+, V6+, V0-, V1-, V2-, V3-,
Pressure reduction between V4-, V5-, V6-electrode voltage Vcom together determines the GTG of pixel, assumes source in this example
When pole drives the maximum differential pressure between the voltage electrode voltage Vcom together on line to be 8V, common electrode voltage Vcom
It is set as 8V, and the voltage on source drive line will change between 0V to 16V, such as voltage V0+, V1+,
V2+, V3+, V4+, V5+, V6+ are respectively 9V, 10V, 11V, 12V, 13V, 14V, 15V, voltage
V1-, V2-, V3-, V4-, V5-, V6-are respectively 7V, 6V, 5V, 4V, 3V, 2V, 1V.Fig. 7 shows
Show exchange common electrode voltage driving method, its be apply an alternating current drive signal to common-battery pole plate so that common electrode is electric
Pressure Vcom is alternately switching between two voltage, voltage V0+ on source drive line, V1+, V2+, V3+,
V4+, V5+, V6+, V7+, V0-, V1-, V2-, V3-, V4-, V5-, V6-, V7-electrode voltage together
Pressure reduction between Vcom determines the GTG of pixel, assumes the voltage on source drive line and common electrode electricity in this example
Maximum differential pressure between pressure Vcom is 8V, and common electrode voltage Vcom is set between 0V and 8V alternately switching,
Then the voltage on source drive line will change between 0V to 8V, such as voltage V0+, V1+, V2+, V3+,
V4+, V5+, V6+, V7+ are respectively 1V, 2V, 3V, 4V, 5V, 6V, 7V, 8V, voltage V1-,
V2-, V3-, V4-, V5-, V6-, V7-are respectively 7V, 6V, 5V, 4V, 3V, 2V, 1V, 0V.By
Above narration understands, in the case of maximum differential pressure is identical, compared to the type of drive of direct current common electrode voltage, exchange
The type of drive of common electrode voltage can reduce pressure reduction between minima and the maximum of voltage on source drive line with
Reduce power consumption, and can realize to reduce chip size with low pressure process.In addition driving of common electrode voltage is exchanged
Flowing mode also has relatively low inrush current (in-rush current), and old friend flows the type of drive of common electrode voltage to be had relatively
Low noise, and then there is preferably signal to noise ratio (signal to noise ratio；S/N).
In current LCD display, the type of drive of dipole inversion about can be divided into frame reversion (frame inversion),
Row reversion (row inversion), row reversion (column inversion) and some reversion (dot inversion) etc. four kinds.Fig. 8
Showing the example of four kinds of dipole inversion driving methods in known LCD display, wherein the type of drive of frame reversion is the
During N frame, be positive polarity by the polarity set of pixels all in LCD 26, i.e. voltage on source drive line is big
In common electrode voltage Vcom, then when next frame (N+1 frame), by pixels all in LCD 26
Polarity inversion is negative polarity, i.e. voltage on source drive line is less than common electrode voltage Vcom.Row shown in Fig. 8 are anti-
The type of drive turned, when nth frame, is positive polarity by the pixel placement on first row, the 3rd row and the 5th row,
Pixel placement on secondary series and the 4th row is negative polarity, then when N+1 frame, and first row, the 3rd row and the
Pixel inversion on five row is negative polarity, and the pixel inversion on secondary series and the 4th row is positive polarity.Row shown in Fig. 8
The type of drive of reversion, when nth frame, is positive polarity by the pixel placement on the first row, the third line and fifth line,
Pixel placement on second row and fourth line is negative polarity, then when N+1 frame, and the first row, the third line and
Pixel inversion on the five elements is negative polarity, and the pixel inversion on the second row and fourth line is positive polarity.Point shown in Fig. 8
The type of drive of reversion is to be contrary by the polarity set of neighbor, and identical bits in nth frame and N+1 frame
The opposite polarity of the pixel put.
Fig. 8 frame invert and row reversion driving method in, with the pixel on string by simultaneously charging (positive polarity) or
Electric discharge (negative polarity), this can cause horizontal crosstalk (horizontal crosstalk).Fig. 9 illustrates to form the former of horizontal crosstalk
Cause, when the N bar raster data model line is driven, if this is classified as positive polarity, the most a plurality of source drive line will be simultaneously
Respective electric capacity Cs is charged, but has parasitic capacitance Clc between electric capacity Cs battery lead plate 34 together, therefore own
Source drive line when respective electric capacity Cs is charged, common-battery pole plate 34 is charged the most simultaneously, so improve common-battery
The common electrode voltage Vcom of pole plate 34, the GTG causing the pixel on the N bar raster data model line to be presented is incorrect.
Same, if this is classified as negative polarity, then common-battery pole plate 34 can be caused to discharge, and then reduce being total to of common-battery pole plate 34
Electrode voltage Vcom, the GTG causing the pixel on the N bar raster data model line to be presented is incorrect.Row in Fig. 8
Reversion and some inversion driving method can improve horizontal crosstalk, because being expert in reversion and some inversion driving method, same
The polarity of the pixel on row is alternately to change, and therefore common-battery pole plate 34 can be charged by part source drive line, and another
Common-battery pole plate 34 can be discharged by the source drive line of part, and charge and discharge cancels each other to reduce common electrode voltage
The impact of Vcom, and then reduce horizontal crosstalk.
Frame at Fig. 8 inverts and in the driving method of row reversion, continues charge or discharge, this meeting with the pixel in a line
Cause vertical crosstalk (vertical crosstalk).Figure 10 illustrates to be formed the reason of vertical crosstalk, and source drive line is via many
Individual thin film transistor (TFT) 36,40,44 connects multiple pixel 38,42,46 respectively, when one of them thin film transistor (TFT) 40
Switched on during to pixel 40 charge or discharge to determine pixel voltage (GTG), due to thin film transistor (TFT) 36,40,
Parasitic capacitance Csd can be formed, therefore at source drive line to powered pixel between source S and the drain D of 44
While 40 charge or discharge, also have leakage current Ilc and be not driven on this source drive line through parasitic capacitance Csd
Pixel 38,46 charge or discharge, again frame reversion and row reversion driving method in, have identical with the pixel of a line
Polarity, i.e. can persistently be electrically charged with the pixel 38,42,46 in a line and make its pixel voltage persistently increase or continue
It is discharged and makes its pixel voltage continuous decrease, and then cause pixel 38,42,46 to show incorrect GTG.Figure
Row reversion and some inversion driving method in 8 can improve vertical crosstalk, because at row reversion and some inversion driving method
In, it is alternately to change with the polarity of the pixel in a line, therefore charge and discharge can cancel each other to reduce vertical crosstalk.
As it has been described above, some inversion driving method can allow same string and be positive polarity with the one part of pixel in a line, separately
One part of pixel is negative polarity, therefore can improve horizontal crosstalk and vertical crosstalk simultaneously, but puts inversion driving method at present
Only use the type of drive of direct current common electrode voltage, do not use the type of drive of exchange common electrode voltage.
Summary of the invention
An object of the present invention, be to propose a kind of overstepping one's bounds time touch-control and the embedded liquid crystal display of display and non-
Timesharing touch-control and display drive method.
An object of the present invention, is to propose a kind of embedded liquid crystal display using block exchange common electrode voltage
And block exchange common electrode voltage drive method.
An object of the present invention, is to propose a kind of binding site inversion driving mode and exchange common electrode voltage driving side
The embedded liquid crystal display of formula.
According to the present invention, a kind of apply touch-control and display drive method when embedded liquid crystal display overstepping one's bounds, including:
Apply alternating current drive signal respectively to multiple common-battery pole plates of this embedded liquid crystal display to determine each this common electrode
The common electrode voltage of plate, wherein this alternating current drive signal is alternately to switch between a high levle and a low level, this height
The persistent period of level and low level equal to single bar raster data model line driving time or be the integer of this driving time
Times；In period of this high levle and the period of this low level of this alternating current drive signal, by a plurality of source drive line pair
Powered pixel applies pixel voltage to show image；And this alternating current drive signal this high levle period or
The period of this low level, detect the plurality of common-battery pole plate to determine whether that object touches this embedded liquid crystal display.
Wherein, the phase place applying the alternating current drive signal to this different common-battery pole plates can be contrary.
According to the present invention, a kind of overstepping one's bounds time touch-control and the embedded liquid crystal display of display, including a plurality of raster data model line,
A plurality of source drive line, multiple common-battery pole plate and a touch control detection circuit.This plurality of raster data model line is to select to want
The pixel driven.Each this common-battery pole plate is applied in the alternating current drive signal reference potential with the multiple pixels of decision, its
In this alternating current drive signal be alternately to switch between a high levle and a low level, continuing of this high levle and low level
Time equal to this raster data model line of single bar driving time or be the integral multiple of this driving time.Letter is driven in this exchange
Number period of this high levle and the period of this low level, this plurality of source drive line applies pixel to powered pixel
Voltage, and GTG or the color of this powered pixel is determined according to the pressure reduction of this pixel voltage Yu this reference potential.?
The period of this high levle of this alternating current drive signal or the period of this low level, this touch control detection electric circuit inspection is the plurality of common
The change in electrical charge that battery lead plate produces because of the switching of the level of this alternating current drive signal, it may be judged whether have object to touch this embedded
Formula liquid crystal display.Wherein, the phase place applying the alternating current drive signal to this different common-battery pole plates can be contrary.
The present invention can process touch-control sensing simultaneously and frame shows, need not shorten the display time and reach touch-control sensing, because of
This present invention has the more display time, can apply the embedded liquid crystal display at high-res.Additionally, this
Invention can allow the opposite in phase of alternating current drive signal of different common-battery pole plates, makes same a line and with last point of string
Pixel is positive polarity, and another part pixel is negative polarity, reaches effect of reversion.
Accompanying drawing explanation
Fig. 1 shows known liquid crystal display；
Touch-control when display time when Fig. 2 illustrates uncombined touch controllable function and combination of touch control function and display time；
Fig. 3 shows touch-control known to the first and display time-sharing method；
Fig. 4 shows touch-control known to the second and display time-sharing method；
Fig. 5 shows touch-control known to the third and display time-sharing method；
Fig. 6 shows the driving method of direct current common electrode voltage；
Fig. 7 shows the driving method of exchange common electrode voltage；
Fig. 8 shows four kinds of dipole inversion driving methods of known LCD display；
Fig. 9 illustrates to be formed the reason of horizontal crosstalk；
Figure 10 illustrates to be formed the reason of vertical crosstalk；
Figure 11 shows the embodiment of the embedded liquid crystal display of touch-control and display when the present invention is overstepping one's bounds；
Figure 12 is the partial enlarged drawing of LCD 26 in Figure 11；
Figure 13 is the profile of LCD 26 in Figure 11；
Touch-control and display drive method when Figure 14 shows the present invention overstepping one's bounds；
Figure 15 shows the enlarged drawing of waveform 74 in Figure 14；
Figure 16 shows one of them circuit corresponding to common-battery pole plate in Figure 11；
Figure 17 shows the equivalent circuit that in Figure 16, Article 1 touch induction lines TP1 is seen；
Figure 18 shows the alternating current drive signal of block of the present invention exchange common electrode voltage driving mode；
Figure 19 shows that adjacent common-battery pole plate applies the first embodiment of the alternating current drive signal of opposite in phase respectively；
Figure 20 shows that adjacent common-battery pole plate applies the second embodiment of the alternating current drive signal of opposite in phase respectively；Figure
21 show that adjacent common-battery pole plate applies the 3rd embodiment of the alternating current drive signal of opposite in phase respectively.
Drawing reference numeral
10 low-voltage differential signal transmission circuits
12 LCD control circuits
14 LCD control ASIC
16 reference voltage generators
18 gate drivers
20 gate drivers
22 source electrode drivers
24 source electrode drivers
26 LCD
The waveform of 28 gate drive signals
The waveform of 30 gate drive signals
The waveform of 32 touch sense signals
34 common-battery pole plates
36 thin film transistor (TFT)s
38 pixels
40 thin film transistor (TFT)s
42 pixels
44 thin film transistor (TFT)s
46 pixels
48 sequential control circuits
50 common-battery pole plates
52 through holes
54 touch induction lines
56 touch control detection circuit
58 raster data model lines
60 source drive lines
62 pixel electrodes
64 pixel electrodes
66 pixel electrodes
68 pixels
70 insulating barriers
The waveform of the voltage of 72 source drive lines
The waveform of 74 common electrode voltage Vcom
The waveform of 76 alternating current drive signal
The waveform of 78 common electrode voltage Vcom
80 thin film transistor (TFT)s
The waveform of 82 alternating current drive signal
The waveform of 84 alternating current drive signal
Detailed description of the invention
Figure 11 shows the embodiment of the embedded liquid crystal display of touch-control and display when the present invention is overstepping one's bounds, and it includes multiple
Gate drivers 18, multiple source electrode driver 22, LCD 26, time schedule controller 48 and touch control detection circuit
56.Time schedule controller 48 comprises LCD and controls ASIC 14, and in order to control multiple gate drivers 18 and multiple
The time sequential routine of source electrode driver 22.LCD 26 comprises multiple common-battery pole plate 50, each common-battery pole plate 50
Connect at least one touch induction lines 54 via at least pass through aperture 52, and each touch induction lines 54 can only connect
Connect a common-battery pole plate 50.Touch control detection circuit 56 detects the voltage on common-battery pole plate 50 through touch induction lines 54
Or electric charge is to determine whether object touching LCD and touch position.In fig. 11, in order to simplify graphic and
Touch control detection circuit 56 it is then connected to after all touch induction lines 54 being linked together, but it practice, touch-control sensing
Line 54 does not interconnect.It is said that in general, each source electrode driver 22 is exactly an integrated circuit (IC), therefore
Touch control detection circuit 56 can also be integrated in one of them source electrode driver 22, and touch induction lines 54 then connects
To the source electrode driver 22 with touch control detection function.Figure 12 is the partial enlarged drawing of LCD 26 in Figure 11,
The corresponding multiple pixels 68 of each of which common-battery pole plate 50, each pixel comprises three pixel electrodes 62,64,66
Produce redness, green, blue three kinds of coloured light respectively.Multiple gate drivers 18 are according to from time schedule controller 48
Instruction be sequentially driven a plurality of raster data model line 58, each raster data model line 58 couples multiple pixel electrode.Multiple
Source electrode driver 22 applies pixel voltage extremely a plurality of source drive line 60 according to the instruction from time schedule controller 48,
These pixel voltages are applied to pixel electrode, to determine GTG or the color of pixel 68, and then display image.Figure
13 is the profile of LCD 26 in Figure 11, and wherein common-battery pole plate 50 connects touch-control sensing via through hole 52
Line 54, and intercepted by insulating barrier 70 between touch induction lines 54 and source drive line 60.
In the present invention, common-battery pole plate 50 is in addition to providing the reference potential of pixel 68, also as touch control detection
Drive and receive electrode.Touch-control and display drive method when Figure 14 shows the present invention overstepping one's bounds, wherein waveform 72 is source
Pole drives the voltage of line 60, and waveform 74 is the common electrode voltage Vcom on common-battery pole plate 50, and waveform 76 is to provide
To the alternating current drive signal of common-battery pole plate 50, this embodiment is as a example by the whitest picture.Alternating current drive signal 76
High levle and low level duration T HL equal to single bar raster data model line 58 driving time or be this driving
The integral multiple of time.The resolution assuming LCD 26 is 1920 × 1080, and frame turnover rate is 60Hz, the most often
Article one, the driving time of raster data model line 58 is about 15 μ s.If the high levle of alternating current drive signal 76 and low level
When duration T HL is 15 μ s, this represents often one raster data model line 58 of driving, the standard of alternating current drive signal 76
Position just switching is once.When the high levle of alternating current drive signal 76 and the persistent period of low level are 15 μ s × 2=30 μ s,
This represents often two raster data model lines 58 of driving, and the level of alternating current drive signal 76 switches once, by that analogy.
With reference to Figure 11, Figure 12 and Figure 14, when driving the N bar raster data model line 58, such as the time t1 of Figure 14
Shown in, the waveform 76 of alternating current drive signal is become high levle from low level, such as, become 8V from 0V, now exchange
Signal is driven common-battery pole plate 50 to be charged, so that common electrode voltage Vcom is risen to 8V by 0V, such as Figure 14
Shown in waveform 74, and the time that this section of common electrode voltage Vcom is risen to 8V by 0V can be used to realize touch-control sense
Survey.Also the pixel voltage applying 0.1V at time t1 source electrode driver 22 makes the voltage of source drive line 60 from 7.9V
Drop to 0.1V, as shown in the waveform 72 of Figure 14, due to the voltage of source drive line 60 needs a period of time could
Stable in desired value, therefore change and after a period of time Td at pixel voltage, then the source drive line that breech lock is now
Pressure reduction-7.9V between the voltage of 60 electrode voltage Vcom together determines GTG or the face of pixel as LCD data
Color.LCD data latching must be before upper once pixel voltage changes, because this time Td can not be more than time t2-t1.
When driving the N+1 bar raster data model line 58, as shown in the time t2 of Figure 14, the waveform 76 of alternating current drive signal
Being become 0V from 8V, now common-battery pole plate 50 discharges so that common electrode voltage Vcom is dropped to 0V by 8V, such as figure
Shown in the waveform 74 of 14, and the time that this section of common electrode voltage Vcom is dropped to 0V by 8V can be used to reach
Touch-control sensing.Also the pixel voltage applying 7.9V at time t2 source electrode driver 22 makes the electricity of source drive line 60
Pressure rises to 07.9V from 0.1V, as shown in the waveform 72 of Figure 14, owing to the voltage of source drive line 60 needs one
The section time could be stable in desired value, and therefore in pixel voltage change and after a period of time Td, then breech lock is now
Pressure reduction 7.9V between the voltage of source drive line 60 electrode voltage Vcom together determines pixel as LCD data
GTG or color.LCD data latching must be before upper once pixel voltage changes, because this time Td can not be big
In time t3-t2.The driving method of the present invention during providing pixel voltage to set the GTG of pixel or color,
Carry out touch-control sensing, i.e. touch-control with display is to process rather than time-division processing, the driving method of the present invention simultaneously simultaneously
Need not be shortened by the display time realizes touch-control sensing, therefore in the application of embedded liquid crystal display of high-res
In, the present invention still can be suitable for.In the embodiment of Figure 14, it is to become by low level at common electrode voltage Vcom
A touch-control sensing is respectively carried out, in other embodiments for high levle and when being become low level from high levle, it is also possible to
Only carry out touch-control sense when common electrode voltage Vcom is become high levle from low level or when being become low level from high levle
Survey.
Figure 15 shows the enlarged drawing of waveform 74 in Figure 14, in order to sensing method of touch control to be described.When there being finger to touch,
The equivalent capacity of the common-battery pole plate of touch position will rise, therefore when alternating current drive signal is become 8V from 0V, as
Shown in time t1, the rate of climb of the common electrode voltage Vcom of the common-battery pole plate of touch position is relatively slow, as Figure 15 is left
Shown in the waveform 78 of the common electrode voltage Vcom of side, say, that can be come by detection common electrode voltage Vcom
Determine whether that finger is touched.Such as become 8V from 0V and during through preset time T r1 at alternating current drive signal,
Detection common electrode voltage Vcom, if be detected that common electrode voltage Vcom indicate without hands more than predeterminated voltage Vr1
Refer to touching, contrary if be detected that common electrode voltage Vcom then indicate that finger is touched less than predeterminated voltage Vr1.
When alternating current drive signal is become 0V from 8V, as shown in time t2, the common electrode electricity of the common-battery pole plate of touch position
The decrease speed of pressure Vcom is relatively slow, as shown in the waveform 78 of Figure 15 right, therefore at alternating current drive signal by 8V
Become 0V and when preset time T f1, detect common electrode voltage Vcom, if be detected that common electrode voltage
Vcom indicates without finger touching less than predeterminated voltage Vf1, contrary if be detected that common electrode voltage Vcom big
Then indicate that finger is touched in predeterminated voltage Vf1.
Another kind of sensing method of touch control is that detection common electrode voltage Vcom rises or falls the time to a predeterminated voltage.
With reference to time t1 and the waveform 78 of left of Figure 15, when alternating current drive signal is become 8V from 0V, touch position
The rate of climb of common electrode voltage Vcom of common-battery pole plate relatively slow, therefore common electrode voltage Vcom needs longer
Time just can rise to predeterminated voltage Vr2, in other words, can rise to preset by counting common electrode voltage Vcom
The time of voltage Vr2 determines whether that finger is touched, if common electrode voltage Vcom rises to predeterminated voltage Vr2
Gate time less than preset time T r2 time indicate without finger touch, if contrary gate time be more than Preset Time
Tr2 then indicates that finger is touched.When alternating current drive signal is become 0V from 8V, as shown in time t2, touch position
The decrease speed of the common electrode voltage Vcom of the common-battery pole plate put is relatively slow, as shown in the waveform 78 of Figure 15 right, because of
This counting common electrode voltage Vcom drops to time of predeterminated voltage Vf2 and determines whether that finger touch, if common
Electrode voltage Vcom indicates tactile without finger when dropping to the gate time of predeterminated voltage Vr2 less than preset time T f2
Touch, if contrary gate time is more than preset time T f2, indicate that finger is touched.
Figure 16 shows one of them circuit corresponding to common-battery pole plate in Figure 11, each of which raster data model line 58
Connecting the grid with the thin film transistor (TFT) 80 on string, each source drive line 60 connects the thin film crystalline substance in same a line
The source electrode of body pipe 80, each corresponding source drive line 60 of touch induction lines 54, common-battery pole plate 50 is through Figure 11
Shown through hole 52 connects Article 1 touch induction lines TP1 in a plurality of touch induction lines 54.Each film crystal
Parasitic capacitance Clc is had, between each touch induction lines 54 battery lead plate 50 together between pipe 80 battery lead plate 50 together
There is parasitic capacitance Ctv, between each touch induction lines 54 and corresponding source drive line 60, have parasitic capacitance Cts.
As shown in figure 16, when applying pixel voltage to source drive line 60, can be through parasitic capacitance Clc, Ctv, Cts shadow
Ring to common-battery pole plate 50 and the voltage of touch induction lines 54, in order to avoid touch induction lines TP1 is being carried out touch-control
Affected by voltage on source drive line S1-SN during sensing, touch induction lines TP1 can be carried out Trackpad dynamic
Compensate (touch panel dynamic compensation) to increase the accuracy of touch-control sensing.Figure 17 is the letter of Figure 16
Changing equivalent circuit, it shows the parasitic capacitance seen from Article 1 touch induction lines TP1, and wherein Cf is finger touching
Time produce parasitic capacitance.Parasitic capacitance Clc in Figure 16 and Figure 17, Ctv, Cts are can after circuit completes
To precalculate or to measure the fixed value obtained, therefore source drive line can be calculated according to the equivalent circuit of Figure 17
The impact on touch induction lines TP1 of the voltage on S1-SN, and then it is dynamic that touch induction lines TP1 is carried out Trackpad
Compensate, to have recognized whether that finger is touched more accurately.
In the embedded liquid crystal display of Figure 11, all of common-battery pole plate 50 can be applied in identical exchange and drive
Signal is to produce identical common electrode voltage Vcom.In addition it is also possible to multiple common-battery pole plates 50 are divided into two parts,
Apply the alternating current drive signal of opposite in phase respectively and drive to reach block exchange common electrode voltage, such as will with string or
It is divided into two parts with the common-battery pole plate 50 in a line, applies the alternating current drive signal of opposite in phase respectively, or by phase
Adjacent common-battery pole plate 50 applies the alternating current drive signal of opposite in phase respectively.
Figure 18 shows the alternating current drive signal of block of the present invention exchange common electrode voltage driving mode, wherein waveform 82
And 84 be the alternating current drive signal of opposite in phase.As it was previously stated, the high levle of alternating current drive signal 82 and 84 and low
Duration T HL of level equal to single bar raster data model line 58 driving time or be the integer of this driving time
Times, with after often driving one or more raster data model line 58, make the pixel of next raster data model line 58 corresponding
Polarity inversion.The driving time assuming each raster data model line 58 is 15 μ s, if alternating current drive signal 82 and 84
High levle and duration T HL of low level when being 15 μ s, this represents and often drives a raster data model line 58,
The level of alternating current drive signal just switches once, therefore as shown in the common-battery pole plate 50 of Figure 19, and same common-battery pole plate
The opposite polarity of the pixel of adjacent column in 50.When the high levle of alternating current drive signal and the persistent period of low level it is
During 15 μ s × 2=30 μ s, this represents often two raster data model lines 58 of driving, and the level of alternating current drive signal switches once,
Therefore as shown in the common-battery pole plate 50 of Figure 20, can be every the polarity phase of the pixel of two row in same common-battery pole plate 50
Instead.If the pixel on each common-battery pole plate 50 has 5 row, the high levle of alternating current drive signal and low level
When duration T HL is 15 μ s × 5=75 μ s to the maximum, this represents often 5 raster data model lines 58 of driving or same common-battery
After the pixel of pole plate 50 all drives, the level of alternating current drive signal switches once, as shown in figure 21, the most same
The polarity of all pixels of the common-battery pole plate 50 of row is identical, and the pole of the pixel with common-battery pole plate 50 adjacent on string
Property is contrary.
Owing to the present invention is to use exchange common electrode voltage drive method, therefore compared to direct current common electrode voltage driving side
Formula, the present invention can realize to reduce chip size with low pressure process, and have preferably signal to noise ratio.
With reference to Figure 19 and Figure 20, block of the present invention exchange common electrode voltage driving mode not only can allow on same string one
The pixel of part is positive polarity, and the pixel of another part is negative polarity, can also allow last point of pixel of same a line simultaneously
For positive polarity, another part is negative polarity.Therefore, the block exchange common electrode voltage driving mode of the present invention can also
Realize some inversion driving mode as shown in Figure 8, to reduce vertical crosstalk and horizontal crosstalk.
In a lcd display, the IC cost of source electrode driver 22 is high more than the IC cost of gate drivers 18,
Therefore there is a kind of bigrid (dual gate) panel of manufacturer's proposition to reduce the quantity of source electrode driver 22, this double grid pole-face
Plate is a raster data model line 58 to be divided into two-stage nitration driven by two gate drivers 18 respectively, but these two sections of grids drive
Moving-wire shares one group of source electrode driver, it is impossible to simultaneously drives and carries out pixel renewal, and the driving time of the most each pixel will
Can halve.Under the different resolution of table 1 below display, bigrid panel and the source electrode driver quantity of standard panel and picture
The driving time of element, for prior art, timesharing touch-control to be reached and display function in embedded liquid crystal display,
The driving time of 8 μ s has been the limit, the most as known from Table 1, when the LCD face of known embedded liquid crystal display
When the resolution of plate is more than 1600 × 900, just cannot re-use two grid type of drive.But the present invention's is embedded
Touch-control and the display function of liquid crystal display are to process simultaneously, therefore the embedded liquid crystal display of the present invention can be at resolution
Higher LCD uses bigrid type of drive, to reduce the quantity of source electrode driver, and then reduces IC one-tenth
This.
Table 1
The purpose being stated as illustrating made for presently preferred embodiments of the present invention above, based on above teaching or from this
Inventive embodiment learns and makes an amendment or change is possible.Embodiment is that the principle and allowing explaining orally the present invention is familiar with
This operator understands the technology of the present invention, is not limited to the claim of the present invention.
Claims (15)
1. apply touch-control and display drive method when embedded liquid crystal display overstepping one's bounds for one kind, it is characterised in that
Described embedded liquid crystal display comprises multiple common-battery pole plate, a plurality of raster data model line and a plurality of source drive line, described
A plurality of raster data model line is in order to select pixel to be driven, and each described common-battery pole plate is in order to set the ginseng of multiple pixel
Examine current potential, described overstepping one's bounds time touch-control and display drive method comprise the following steps:
Apply alternating current drive signal respectively to common-battery pole plate each described to determine the common electrode of each described common-battery pole plate
Voltage, wherein said alternating current drive signal is alternately to switch between a high levle and a low level, described high levle and
The persistent period of low level equal to raster data model line described in single bar driving time or be the integer of described driving time
Times；
In period of described high levle and the period of described low level of described alternating current drive signal, by described a plurality of source
Pole drives line that powered pixel is applied pixel voltage to show image；And
In period of described high levle or the period of described low level of described alternating current drive signal, detect the plurality of common
Battery lead plate is to determine whether that object touches described embedded liquid crystal display.
The most according to claim 1 overstepping one's bounds time touch-control and display drive method, it is characterised in that described difference
Apply alternating current drive signal to the step of common-battery pole plate each described to include the plurality of common-battery pole plate on same string
It is divided into two parts and applies the described alternating current drive signal of opposite in phase respectively.
The most according to claim 2 overstepping one's bounds time touch-control and display drive method, it is characterised in that described will be with
The plurality of common-battery pole plate on string is divided into the step that two parts apply the described alternating current drive signal of opposite in phase respectively
Suddenly the described alternating current drive signal that the adjacent common-battery pole plate on same string is applied opposite in phase is included.
The most according to claim 1 overstepping one's bounds time touch-control and display drive method, it is characterised in that described difference
Apply alternating current drive signal to the step of common-battery pole plate each described to include the plurality of common-battery pole plate in same a line
It is divided into two parts and applies the described alternating current drive signal of opposite in phase respectively.
The most according to claim 4 overstepping one's bounds time touch-control and display drive method, it is characterised in that described will be with
The plurality of common-battery pole plate in a line is divided into the step that two parts apply the described alternating current drive signal of opposite in phase respectively
Suddenly the described alternating current drive signal that the adjacent common-battery pole plate in same a line is applied opposite in phase is included.
The most according to claim 1 overstepping one's bounds time touch-control and display drive method, it is characterised in that described detection
The step of the plurality of common-battery pole plate is included in the standard of the described alternating current drive signal that the plurality of common-battery pole plate is applied in
Position switches and when a Preset Time, and whether the voltage detecting the plurality of common-battery pole plate reaches a predeterminated voltage.
The most according to claim 1 overstepping one's bounds time touch-control and display drive method, it is characterised in that described detection
The step of the plurality of common-battery pole plate is included in the standard of the described alternating current drive signal that the plurality of common-battery pole plate is applied in
During the switching of position, count the voltage of the plurality of common-battery pole plate and reach time of a predeterminated voltage when whether presetting more than one
Between.
8. one kind overstepping one's bounds time touch-control and the embedded liquid crystal display of display, it is characterised in that described overstepping one's bounds time touch-control
And the embedded liquid crystal display of display includes:
A plurality of raster data model line, in order to select pixel to be driven；
Multiple common-battery pole plates, each described common-battery pole plate is applied in alternating current drive signal to determine the reference of multiple pixels
Current potential, wherein said alternating current drive signal is alternately to switch between a high levle and a low level, described high levle and
The persistent period of low level equal to raster data model line described in single bar driving time or be the integer of described driving time
Times；
A plurality of source drive line, in period of described high levle and the phase of described low level of described alternating current drive signal
Between, powered pixel is applied pixel voltage, and determines according to the pressure reduction of described pixel voltage with described reference potential
The color of described powered pixel；And
One touch control detection circuit, in period of described high levle or the phase of described low level of described alternating current drive signal
Between, by detecting the change in electrical charge that the plurality of common-battery pole plate produces because the level of described alternating current drive signal switches,
Determine whether that object touches described embedded liquid crystal display.
Embedded liquid crystal display the most according to claim 8, it is characterised in that described embedded liquid crystal
Show that device further includes a plurality of touch induction lines and connects described touch control detection circuit and connect the plurality of common-battery pole plate respectively.
Embedded liquid crystal display the most according to claim 8, it is characterised in that described on same string
Multiple common-battery pole plates are divided into two parts the described alternating current drive signal applying opposite in phase respectively.
11. embedded liquid crystal displays according to claim 10, it is characterised in that the phase on same string
Adjacent common-battery pole plate is applied in the described alternating current drive signal of opposite in phase.
12. embedded liquid crystal displays according to claim 8, it is characterised in that on a same row described
Multiple common-battery pole plates are divided into two parts and are applied in the described alternating current drive signal of opposite in phase respectively.
13. embedded liquid crystal displays according to claim 12, it is characterised in that phase on a same row
Adjacent common-battery pole plate applies the described alternating current drive signal of opposite in phase.
14. embedded liquid crystal displays according to claim 8, it is characterised in that described touch control detection circuit
Level at described alternating current drive signal switches and during through a Preset Time, and the voltage detecting the plurality of common-battery pole plate is
No reach a predeterminated voltage, to determine whether that object touches described embedded liquid crystal display.
15. embedded liquid crystal displays according to claim 8, it is characterised in that described touch control detection circuit
When the level of described alternating current drive signal switches, the voltage counting the plurality of common-battery pole plate reaches a predeterminated voltage
Time whether more than a Preset Time, to determine whether that object touches described embedded liquid crystal display.
Applications Claiming Priority (4)
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| US201562157483P | 2015-05-06 | 2015-05-06 | |
| US62/157,483 | 2015-05-06 | ||
| TW104127219A TWI575416B (en) | 2015-05-06 | 2015-08-20 | Non-time-sharing touch and display of embedded LCD display and its non-time-sharing touch and display drive method |
| TW104127219 | 2015-08-20 |
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| CN106128374A true CN106128374A (en) | 2016-11-16 |
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