CN109410822A - Voltage level conversion circuit and display panel drive control method - Google Patents
Voltage level conversion circuit and display panel drive control method Download PDFInfo
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- CN109410822A CN109410822A CN201811588326.5A CN201811588326A CN109410822A CN 109410822 A CN109410822 A CN 109410822A CN 201811588326 A CN201811588326 A CN 201811588326A CN 109410822 A CN109410822 A CN 109410822A
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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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Abstract
The invention provides a voltage level conversion circuit and a display panel driving control method. The voltage level conversion circuit is coupled to a plurality of data lines in the display panel through a multiplexer. The voltage level conversion circuit comprises a voltage level conversion unit and a control unit. The voltage level conversion unit is coupled to the multiplexer and respectively receives a first voltage level, a second voltage level and a third voltage level, wherein the third voltage level is higher than the second voltage level and the second voltage level is higher than the first voltage level. The control unit is coupled to the voltage level conversion unit and used for selectively controlling the voltage level conversion unit to output a first voltage level or a second voltage level to the multiplexer according to the voltage level of the timing control signal.
Description
Technical field
The present invention is related with display device, especially with respect to a kind of voltage level converting and display panel drive control
Method.
Background technique
In general, the source electrode driver output in display device can be coupled to a plurality of number of display panel by multiplexer
According to line (Data line), for example, as shown in Figure 1, two source electrode driver output SO1 can be respectively by different from SO2
Multiplexer MUXA and MUXB are coupled to four data line DL1~DL4.
As shown in Fig. 2, in the moment (such as time t2 and t4) that multiplexer MUXA or MUXB are opened, source electrode driver output
Data-signal SDAT will appear voltage decline (Voltage drop) the phenomenon that, as shown in enclosing the dotted line in Fig. 2, thus
Display panel is caused the problem of pixel (Pixel) charge rate deficiency occur.
As shown in figure 3, being filled by source electrode driver output SO1 in the moment (such as time t2) that multiplexer MUXA is opened
The electric fan out unit FO1 that satisfies can couple rear end by multiplexer MUXA and there is no the data line DL1 of voltage, due to existing between the two
There is sizable voltage difference, data line DL1 is caused moment biggish electric current occur, thus leads to noise for touch panel TPN wink
Between become larger.Similarly, similar situation is also had in the moment (such as time t4) that multiplexer MUXB is opened.As in multiplexer
The moment (such as time t3 and t5) that MUXA or MUXB is closed, it can also generate biggish noise for touch panel TPN.
As shown in figure 4, if the existing operation timing is first by timing control signal so that source electrode driver exports SO1 as an example
The failing edge of XSTB starts outputting data signals SDAT1 in time t1 starting source electrode driver output SO1 and fills to fan out unit FO1
Then electricity opens multiplexer MUXA then at time t2, the data-signal SDAT that source electrode driver output SO1 is exported leads to
Multiplexer MUXA is crossed to start to the data line DL1 charging in display panel.
From aforementioned: in the moment (that is, time t2) that multiplexer MUXA is opened, data-signal SDAT will appear voltage
The phenomenon that decline and data line DL1 will appear biggish immediate current, cause display panel pixel charge rate may it is insufficient and
Moment biggish noise for touch panel TPN can be generated.
However, since common stylus belongs to the pattern of active pen, above-mentioned biggish touch surface mostly on the market at present
Plate noise TPN likely results in stylus and can not be successfully to be operated on touch panel, it would be highly desirable to be solved.
Summary of the invention
Therefore, the present invention proposes a kind of voltage level converting and display panel drive control method, existing to solve
The above problem that technology is met with.
A specific embodiment according to the present invention is a kind of display panel drive control method.In this embodiment, display
Panel driving control method is to drive the multiple data lines in display panel by multiplexer.
Display panel drive control method comprises the steps of (a) under first time, is started by timing control signal
Multiplexer is started to be pre-charged, wherein multiplexer receives first voltage level in first time；(b) under the second time,
Multiplexer receives second voltage level, wherein the second time was later than at the first time and second voltage level is higher than first voltage electricity
It is flat；And (c) under the third time, multiplexer receives tertiary voltage level, and wherein the third time is later than the second time and third
Voltage level is higher than second voltage level.Wherein, multiplexer rises to the third time by the second voltage level of the second time
The speed of tertiary voltage level is greater than the second voltage that multiplexer was risen to for the second time by the first voltage level of first time
The speed of level.
In an embodiment, step (a) is to be pre-charged according to the triggering of the rising edge of timing control signal to multiplexer.
In an embodiment, step (c) also includes: when multiplexer receive tertiary voltage level when, stop to multiplexer into
Line precharge.
In an embodiment, multiplexer in being in close state at the first time.
In an embodiment, multiplexer is in partially open state in the second time.
In an embodiment, multiplexer is in fully open state in the third time.
In an embodiment, display panel drive control method further includes the following steps: (d) under first time,
According to timing control signal, also triggering starts to charge to the multiple data lines simultaneously.
In an embodiment, step (d) is according to the triggering starting of the rising edge of timing control signal to the multiple data lines
Start to charge.
In an embodiment, display panel drive control method further includes the following steps: under the 4th time, triggering
Multiplexer starts to carry out pre-arcing, wherein the 4th time was later than the third time and multiplexer receives tertiary voltage electricity in the 4th time
It is flat；Under the 5th time, multiplexer receives the 4th voltage level, wherein the 5th time was later than the 4th time and the 4th voltage level
Lower than tertiary voltage level；And under the 6th time, multiplexer receives first voltage level, wherein the 6th time was later than the 5th
Time and first voltage level are lower than the 4th voltage level.
In an embodiment, multiplexer is dropped to the first voltage electricity of the 6th time by the 4th voltage level of the 5th time
Flat speed is greater than the speed that multiplexer is dropped to the 4th voltage level of the 5th time by the tertiary voltage level of the 4th time.
It is according to another embodiment of the present invention a kind of voltage level converting.In this embodiment, voltage electricity
Flat conversion circuit couples the multiple data lines in display panel by multiplexer.Voltage level converting turns comprising voltage level
Change unit and control unit.Voltage level conversion unit couples multiplexer and receives first voltage level, second voltage electricity respectively
Flat and tertiary voltage level, wherein tertiary voltage level is higher than second voltage level and second voltage level is higher than first voltage electricity
It is flat.Control unit couples voltage level conversion unit, selectively to control electricity according to the voltage level of timing control signal
Voltage level converting unit exports first voltage level or second voltage level to multiplexer.
It is according to another embodiment of the present invention also a kind of voltage level converting.In this embodiment, voltage
Level shifting circuit couples the multiple data lines in display panel by multiplexer.Voltage level converting includes that partial pressure is single
Member, voltage level conversion unit and control unit.Partial pressure unit receives first voltage level, second voltage level and third respectively
Voltage level simultaneously generates multiple candidate voltage levels accordingly, and wherein tertiary voltage level is higher than second voltage level and second voltage
Level is higher than first voltage level.Voltage level conversion unit is respectively coupled to multiplexer and partial pressure unit, multiple to receive
Candidate voltage level.Control unit couples voltage level conversion unit, to be selected according to the voltage level of timing control signal
Property control the multiple candidate voltage level of voltage level conversion unit output to multiplexer.
Compared to the prior art, in voltage level converting of the invention and display panel drive control method, when
The rising edge of sequence control signal is other than triggering source electrode driver output starts outputting data signals to fan out unit charging, also
When triggering the unlatching of multiplexer part simultaneously and starting to be pre-charged one section with data line of the exponential type pre-charge curve to display panel
Between after fully open multiplexer again to data line charges electricity.
Since the present invention is before fully opening multiplexer to the data line charging of display panel, first multiplexing can be opened in part
Device is pre-charged the data line of display panel, can not only extend effective charging time of data line and become the charging of data line
Relatively linearly, the phenomenon that can also reducing the immediate current of data line when fully opening multiplexer and voltage is avoided to decline appearance.
Therefore, voltage level converting of the invention and display panel drive control method can effectively promote display surface
The pixel charge rate of plate simultaneously substantially eliminates noise for touch panel, and stylus is smoothly operated on touch panel.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Detailed description of the invention
Fig. 1 shows the signal that existing source electrode driver output is coupled to the multiple data lines of display panel by multiplexer
Figure.
Fig. 2 shows the data-signals of existing source electrode driver output will appear voltage decline in the moment that multiplexer is opened
Timing diagram.
Fig. 3 shows and leads between existing fan out unit and data line in the biggish voltage difference of moment generation that multiplexer is opened
The timing diagram for causing data line biggish immediate current occur and noise for touch panel being made to become larger.
Fig. 4 shows existing driving method and will lead to the voltage decline of data-signal and touch-control in the moment that multiplexer is opened
The timing diagram that panel noise becomes larger.
Fig. 5 shows the schematic diagram of voltage level converting in a preferred embodiment according to the present invention.
Fig. 6 shows the schematic diagram of voltage level converting according to yet another preferred embodiment of the present invention.
Fig. 7 shows the schematic diagram of voltage level converting in another preferred embodiment according to the present invention.
Fig. 8 and Fig. 9 be shown respectively the timing control signal in different embodiments rising edge triggering to multiplexer start into
The timing diagram of line precharge.
Figure 10, which shows the present invention, to improve voltage data signal decline and touch panel in the moment for fully opening multiplexer
The timing diagram of noise.
Figure 11 shows the flow chart of display panel drive control method according to yet another preferred embodiment of the present invention.
Wherein, appended drawing reference:
SO1~SO2: source electrode driver output
FO1~FO2: fan out unit
MUXA~MUXB: multiplexer
DL1~DL4: data line
CLK: clock pulse signal
SDAT, SDAT1: data-signal
TPN: noise for touch panel
T1~t7: time
XSTB: timing control signal
TCON: sequence controller
LS: voltage level converting
MLS: voltage level conversion unit
CU: control unit
FB: feedback unit
EA1: first error amplifier
EA2: the second error amplifier
+: positive input terminal
: negative input end
SWA: the first timing control signal
SWB: the second timing control signal
VGL: first voltage level
GND: second voltage level
VGH: tertiary voltage level
VREF: reference voltage
MTP: storage unit
VDU: partial pressure unit
MOP: multiplexing amplifying unit
R: divider resistance
MUX: multiplexer
OP: operational amplifier
Tx: specific time
Vx: specific voltage level
S10~S14: step
Specific embodiment
Structural principle and working principle of the invention are described in detail with reference to the accompanying drawing:
The present invention is hereinafter described more fully with reference to the accompanying drawings, exemplary implementation the invention is shown in the accompanying drawings
Example.As the skilled person will recognize, described embodiment can be modified in a variety of ways, without departing from
The spirit or scope of the present invention.
In the accompanying drawings, for the sake of clarity, it is exaggerated partial area.Throughout the specification, identical appended drawing reference table
Show identical element.It should be appreciated that ought such as region or substrate element be referred to as another element "upper" or " connection (or
Referred to as couple) " or when " electric connection " another element, can be connect directly on another element or with another element
It (or for coupling) or is electrically connected or intermediary element can be there is also.On the contrary, when element is referred to as " directly in another member
On part " or when " being directly connected to " another element, intermediary element is not present.As it is used herein, " connection (or be coupling
Connect) " it can refer to physics and/or electrical connection.
A preferred embodiment is a kind of voltage level converting according to the present invention.In this embodiment, voltage electricity
Flat conversion circuit can be controlled by sequence controller and can couple the multiple data lines in display panel by multiplexer.Please refer to figure
5, Fig. 5 show the schematic diagram of voltage level converting in this specific embodiment.
As shown in figure 5, voltage level converting LS is respectively coupled to sequence controller TCON and multiplexer MUXA~MUXB,
And multiplexer MUXA~MUXB can couple the multiple data lines (not shown) in display panel, such as multiplexer MUXA can coupling
Another two datas line in display panel can be coupled by connecing two data lines and multiplexer MUXB in display panel, but not as
Limit.
In this embodiment, voltage level converting LS is comprising voltage level conversion unit MLS, control unit CU and instead
Present unit F B.Wherein, control unit CU is respectively coupled to sequence controller TCON, voltage level conversion unit MLS and feedback unit
FB；Voltage level conversion unit MLS is respectively coupled to control unit CU, multiplexer MUXA~MUXB and feedback unit FB.
Feedback unit FB includes first error amplifier EA1 and the second error amplifier EA2.First error amplifier EA1
Positive input terminal+be coupled between voltage level conversion unit MLS and multiplexer MUXA and the output end coupling of error amplifier EA1
It is connected to control unit CU；The positive input terminal of error amplifier EA2+be coupled to voltage level conversion unit MLS and multiplexer MUXB
Between and the output end of error amplifier EA2 be coupled to control unit CU.
Voltage level conversion unit MLS receives first voltage level VGL, second voltage level GND and tertiary voltage respectively
Level VGH, wherein tertiary voltage level VGH is higher than second voltage level GND and second voltage level GND is higher than first voltage electricity
Flat VGL, that is, tertiary voltage level VGH > second voltage level GND > first voltage level VGL.
When control unit CU receives the first timing control signal SWA and the second timing provided by sequence controller TCON
When controlling signal SWB, control unit CU can be according to the voltage of the first timing control signal SWA and the second timing control signal SWB
It controls to lever selection voltage level conversion unit MLS and exports first voltage level VGL or second voltage level GND to multiplexing
Device MUXA~MUXB.
For example, when the voltage level of the first timing control signal SWA is low level (Low-level), control is single
First CU can control voltage level conversion unit MLS according to low level first timing control signal SWA and export first voltage level
VGL to multiplexer MUXA, is at this time not yet pre-charged multiplexer MUXA；When the voltage electricity of the first timing control signal SWA
Flat when being changed into high level (High-level) by low level, control unit CU can be according to the first timing control signal of high level
SWA controls voltage level conversion unit MLS and exports second voltage level GND to multiplexer MUXA, to start to multiplexer MUXA
It is pre-charged.That is, control unit CU is touched by the rising edge (Rising edge) of the first timing control signal SWA
It sends out and controls voltage level conversion unit MLS and start to be pre-charged multiplexer MUXA.
Similarly, when the voltage level of the second timing control signal SWB is low level (Low-level), control unit CU
Voltage level conversion unit MLS output first voltage level VGL can be controlled according to low level second timing control signal SWB extremely
Multiplexer MUXB is at this time not yet pre-charged multiplexer MUXB；When the voltage level of the second timing control signal SWB is by low
When level transitions are high level (High-level), control unit CU can be controlled according to the second timing control signal SWB of high level
Voltage level conversion unit MLS processed exports second voltage level GND to multiplexer MUXB, pre- to start to carry out multiplexer MUXB
Charging.That is, control unit CU is triggered by the rising edge of the second timing control signal SWB and is controlled voltage level conversion
Unit MLS starts to be pre-charged multiplexer MUXB.
In order to judge whether the multiplexer MUXA being pre-charged has reached reference voltage VREF, in feedback unit FB
The positive input terminal of one error amplifier EA1+reception voltage level conversion unit MLS is exported to the pre-charge voltage of multiplexer MUXA
And the negative input end of first error amplifier EA1-reception reference voltage VREF, and it is more to judge to be pre-charged to compare the two
Whether work device MUXA, which has reached, is supplied to control unit CU for judging result after reference voltage VREF.
If above-mentioned judging result be it is yes, represent multiplexer MUXA and be precharged to reference voltage VREF, then control unit CU
Voltage level conversion unit MLS output tertiary voltage level VGH to multiplexer MUXA can be controlled, with end voltage level conversion list
Precharge of first MLS to multiplexer MUXA；If above-mentioned judging result be it is no, represent multiplexer MUXA be not yet precharged to reference to electricity
VREF is pressed, then voltage level conversion unit MLS will continue to be pre-charged multiplexer MUXA.
Similarly, the positive input terminal of the second error amplifier EA2 in feedback unit FB+reception voltage level conversion unit
MLS is exported to the negative input end of the pre-charge voltage of multiplexer MUXB and the second error amplifier EA2-reception reference voltage
VREF, and compare the two to judge judging result after whether the multiplexer MUXB being pre-charged has reached reference voltage VREF
It is supplied to control unit CU.
If above-mentioned judging result be it is yes, represent multiplexer MUXB and be precharged to reference voltage VREF, then control unit CU
Voltage level conversion unit MLS output tertiary voltage level VGH to multiplexer MUXB can be controlled, with end voltage level conversion list
Precharge of first MLS to multiplexer MUXB；If above-mentioned judging result be it is no, represent multiplexer MUXB be not yet precharged to reference to electricity
VREF is pressed, then voltage level conversion unit MLS will continue to be pre-charged multiplexer MUXB.
In another embodiment, Fig. 6 is please referred to, voltage level converting LS does not include feedback unit FB, but is wrapped
The storage unit MTP of the control unit CU containing coupling.In practical application, storage unit MTP can be muptiple-use programmable
(Multi-Time Programming, MTP) circuit, to store presupposed information, but not limited to this.
When the voltage level of the first timing control signal SWA provided by the sequence controller TCON is low level, control
Unit CU can export first voltage level VGL to multiplexer MUXA, not yet be pre-charged at this time to multiplexer MUXA；Work as timing
When the voltage level of first timing control signal SWA provided by controller TCON is changed into high level by low level, control is single
First CU can be according to the presupposed information that storage unit MTP is stored in control voltage level conversion unit MLS output in preset time
Second voltage level GND to multiplexer MUXA, to start to be pre-charged multiplexer MUXA.That is, control unit CU
Rising edge by the first timing control signal SWA triggers and controls voltage level conversion unit MLS and start to multiplexer MUXA
It is pre-charged.At the end of preset time, control unit CU can control voltage level conversion unit MLS output tertiary voltage electricity
Flat VGH to multiplexer MUXA, to terminate the precharge to multiplexer MUXA.
Similarly, when the voltage level of the second timing control signal SWB provided by the sequence controller TCON is low level,
Control unit CU can export first voltage level VGL to multiplexer MUXB, not yet be pre-charged at this time to multiplexer MUXB；When
When the voltage level of second timing control signal SWB provided by sequence controller TCON is changed into high level by low level, control
Unit CU processed can be according to the presupposed information that storage unit MTP is stored in control voltage level conversion unit MLS in preset time
Second voltage level GND to multiplexer MUXB is exported, to start to be pre-charged multiplexer MUXB.That is, control is single
First CU is triggered by the rising edge of the second timing control signal SWB and is controlled voltage level conversion unit MLS and start to multiplexer
MUXB is pre-charged.At the end of preset time, control unit CU can control voltage level conversion unit MLS output third electricity
Voltage level VGH to multiplexer MUXB, to terminate the precharge to multiplexer MUXB.
In another embodiment, Fig. 7 is please referred to, voltage level converting LS may include control unit CU, voltage level
Converting unit MLS, storage unit MTP, partial pressure unit VDU and multiplexing amplifying unit MOP.Wherein, control unit CU is respectively coupled to
Sequence controller TCON, voltage level conversion unit MLS, multiplexing amplifying unit MOP and storage unit MTP；Voltage level conversion
Unit MLS is respectively coupled to control unit CU, multiplexing amplifying unit MOP and multiplexer MUXA~MUXB；Partial pressure unit VDU coupling is more
Work amplifying unit MOP；Multiplexing amplifying unit MOP is respectively coupled to control unit CU and voltage level conversion unit MLS.
Partial pressure unit VDU receives first voltage level VGL, second voltage level GND and tertiary voltage level VGH respectively,
Wherein tertiary voltage level VGH is higher than second voltage level GND and second voltage level GND is higher than first voltage level VGL.Point
Press unit VDU that can generate multiple candidate electricity according to first voltage level VGL, second voltage level GND and tertiary voltage level VGH
Voltage level, and via being supplied to voltage level conversion unit MLS after the processing of multiplexing amplifying unit MOP.
As the first timing control signal SWA provided by control unit CU receives sequence controller TCON, control is single
First CU can selectively control voltage level conversion unit MLS output according to the voltage level of the first timing control signal SWA should
Multiple candidate's voltage levels are to multiplexer MUXA.
For example, when the voltage level of the first timing control signal SWA is low level, control unit CU can be according to low
The first timing control signal SWA control voltage level conversion unit MLS of level exports one in multiple candidate voltage level
Minimum candidate's voltage level (such as first voltage level VGL) is at this time not yet pre-charged multiplexer MUXA to multiplexer MUXA；
When the voltage level of the first timing control signal SWA is changed into high level by low level, control unit CU can be according to high level
The first timing control signal SWA in controlling the multiple candidate voltage electricity of voltage level conversion unit MLS output in preset time
It is higher than minimum candidate voltage level (such as first voltage level VGL) in flat and lower than highest candidate voltage level (such as third
Voltage level VGH) candidate voltage level (include second voltage level GND, but not limited to this), with pre- to multiplexer MUXA
Charging.That is, control unit CU is triggered by the rising edge of the first timing control signal SWA and is controlled voltage level conversion
Unit MLS starts to be pre-charged multiplexer MUXA.At the end of preset time, control unit CU can control voltage level and turn
Unit MLS output highest candidate voltage level (such as tertiary voltage level VGH) is changed to multiplexer MUXA, to terminate to multiplexer
The precharge of MUXA.
Similarly, as the second timing control signal SWB provided by control unit CU receives sequence controller TCON, control
It is defeated that unit CU processed can selectively control voltage level conversion unit MLS according to the voltage level of the second timing control signal SWB
Multiple candidate voltage level is to multiplexer MUXB out.
For example, when the voltage level of the second timing control signal SWB is low level, control unit CU can be according to low
The second timing control signal SWB control voltage level conversion unit MLS of level exports one in multiple candidate voltage level
Minimum candidate's voltage level (such as first voltage level VGL) is at this time not yet pre-charged multiplexer MUXB to multiplexer MUXB；
When the voltage level of the second timing control signal SWB is changed into high level by low level, control unit CU can be according to high level
The second timing control signal SWB in controlling the multiple candidate voltage electricity of voltage level conversion unit MLS output in preset time
It is higher than minimum candidate voltage level (such as first voltage level VGL) in flat and lower than highest candidate voltage level (such as third
Voltage level VGH) candidate voltage level (include second voltage level GND, but not limited to this), with pre- to multiplexer MUXB
Charging.That is, control unit CU is triggered by the rising edge of the second timing control signal SWB and is controlled voltage level conversion
Unit MLS starts to be pre-charged multiplexer MUXB.At the end of preset time, control unit CU can control voltage level and turn
Unit MLS output highest candidate voltage level (such as tertiary voltage level VGH) is changed to multiplexer MUXB, to terminate to multiplexer
The precharge of MUXB.
In an embodiment, voltage level conversion unit MLS may include multiple operational amplifier (not shown)s.Control
The exportable thrust control signals of unit CU use the multiple operational amplifier of control and provide phase to voltage level conversion unit MLS
Corresponding thrust multiple candidate voltage level received by voltage level conversion unit MLS is exported to multiplexer MUXA or
MUXB causes multiple candidate voltage level to form exponential type pre-charge curve, and but not limited to this.
In practical application, partial pressure unit VDU may include multiple divider resistance R, and multiple divider resistance R can go here and there each other
It is coupled between tertiary voltage level VGH and first voltage level VGL, and second voltage level GND may be coupled to multiple partial pressure
In resistance R between any two divider resistances R, but not limited to this.
Fig. 8 and Fig. 9 is please referred to, timing control signal XSTB is the trigger signal of data-signal SDAT output, in timing control
When signal XSTB decline (Falling) processed, data-signal SDAT can just be exported.It should be noted that since the first timing control is believed
Number SWA and the second timing control signal SWB is exactly the voltage amplification signal with the same phase of multiplexer MUXA and MUXB, so scheming
8 and Fig. 9 is not marked especially.In practical application, multiplexer MUXA and MUXB is changed into the time of high level not by low level
It is limited to after timing control signal XSTB decline, it, can also be with because there is the behavior of precharge and exponential region line charge electricity
The transition before timing control signal XSTB decline in advance.
As shown in Figure 8, it is assumed that two multiplexer MUXA~MUXB use the operation timing of MUXA, MUXB, MUXB, MUXA.
In time t1, the first timing control signal SWA (SWA is the voltage amplification signal of the same phase of multiplexer MUXA, so not indicating)
Rising edge triggering multiplexer MUXA is started to be pre-charged, until multiplexer MUXA until the time, t2 was fully opened.This
Outside, in time t1, also log-on data signal SDAT starts to the number in display panel the failing edge of timing control signal XSTB simultaneously
It charges according to line.Similarly, in time t4, (SWB is that the voltage of the same phase of multiplexer MUXB is put to the second timing control signal SWB
Big signal, so not indicating) rising edge triggering multiplexer MUXB is started to be pre-charged, until multiplexer MUXB is in the time
Until t5 is fully opened.
As shown in Figure 9, it is assumed that two multiplexer MUXA~MUXB use the operation timing of MUXA, MUXB, MUXA, MUXB.
In time t1, the first timing control signal SWA (SWA is the voltage amplification signal of the same phase of multiplexer MUXA, so not indicating)
Rising edge triggering multiplexer MUXA is started to be pre-charged, until multiplexer MUXA until the time, t2 was fully opened.This
Outside, in time t1, also log-on data signal SDAT starts to the number in display panel the failing edge of timing control signal XSTB simultaneously
It charges according to line.Similarly, in time t4, (SWB is that the voltage of the same phase of multiplexer MUXB is put to the second timing control signal SWB
Big signal, so not indicating) rising edge triggering multiplexer MUXB is started to be pre-charged, until multiplexer MUXB is in the time
Until t5 is fully opened.
Figure 10 is please referred to, the present invention can decline in the voltage that the moment for fully opening multiplexer improves data-signal and touch-control
The timing diagram of panel noise.
As shown in Figure 10, if by taking multiplexer MUXA as an example, (SWA is the same of multiplexer MUXA to the first timing control signal SWA
The voltage amplification signal of phase, so not indicating) rising edge in time t1 trigger to multiplexer MUXA start to carry out precharge and
It is first voltage level VGL that multiplexer MUXA is received in time t1；Then, multiplexer MUXA in be later than time t1 it is specific when
Between the received specific voltage level Vx for being above first voltage level VGL of tx；Then, multiplexer MUXA is in being later than specific time
The received tertiary voltage level VGH for being above specific voltage level Vx of the time t2 of tx.In practical application, specific time tx
Between time t1 and t2；Specific voltage level Vx is between first voltage level VGL and tertiary voltage level VGH, example
Such as second voltage level GND, but not limited to this.
It should be noted that multiplexer MUXA rises to the third electricity of time t2 from the specific voltage level Vx of specific time tx
The speed of voltage level VGH can be greater than the spy that multiplexer MUXA rises to specific time tx from the first voltage level VGL of time t1
The speed of constant voltage level Vx.
That is, it is assumed that be equal to from time t1 to the time span of specific time tx from specific time tx to time t2's
Time span, that is, specific time tx=(time t1+ time t2)/2, then specific voltage level Vx and tertiary voltage level VGH
Between voltage difference can be greater than voltage difference between first voltage level VGL and specific voltage level Vx；Assuming that specific voltage is electric
Voltage difference between flat Vx and tertiary voltage level VGH is equal to the voltage between first voltage level and specific voltage level Vx
Difference, that is, specific voltage level Vx=(first voltage level VGL+ tertiary voltage level VGH)/2, then from time t1 to it is specific when
Between tx time span can be greater than from specific time tx to the time span of time t2.
From the above: in a period of this section of time t1 to time t2 is pre-charged multiplexer MUXA, part
A kind of exponential type rising, therefore, the multiplexer that part is opened is presented in voltage level received by the multiplexer MUXA of unlatching
MUXA can be pre-charged since time t1 with data line of the exponential type pre-charge curve to display panel, until multiplexer
MUXA is until the time, t2 was fully opened.
In practical application, the present invention in specific time tx and specific voltage level Vx number may each be one or
It is multiple, it is not limited with the single time in above-described embodiment with single voltage level.
For example, the present invention can control multiplexing amplifying unit by the storage unit MTP and control unit CU in Fig. 7
MOP between time t1 to n specific time tx1~txn between time t2 export respectively between first voltage level VGL with
N specific voltage level Vx1~Vxn between tertiary voltage level VGH, wherein n is the positive integer greater than 1, and third is electric
Voltage level VGH > Vxn > Vx (n-1) > ... > Vx1 > first voltage level VGL, causes voltage level conversion unit MLS can
Output index type pre-charge curve.
If multiplexer MUXA rises to the time from the specific voltage level Vxn of specific time txn by taking multiplexer MUXA as an example
The speed > multiplexer MUXA of the tertiary voltage level VGH of t2 rises to from the specific voltage level Vx (n-1) of time tx (n-1)
Specific voltage level Vxn > ... the > multiplexer MUXA of specific time txn rises to from the first voltage level VGL of time t1
The specific voltage level Vx1 of time tx1.
That is, it is assumed that from time t1 to the time span of specific time tx1=from specific time tx1 to specific time
The time span of tx2=...=from specific time txn to the time span of time t2, then specific voltage level Vxn and third are electric
Voltage difference > specific voltage level Vx (n-1) between the voltage level VGH and voltage difference > ... between specific voltage level Vxn
Voltage difference between > first voltage level VGL and specific voltage level Vx1；Assuming that specific voltage level Vxn and tertiary voltage
The voltage difference of voltage difference between level VGH=between specific voltage level Vx (n-1) and specific voltage level Vxn=...=
Voltage difference between first voltage level VGL and specific voltage level Vx1 is then long to the time of specific time tx1 from time t1
It is long to the time of time t2 from specific time txn to spend time span > ... > of the > from specific time tx1 to specific time tx2
Degree.
Similarly, the case where being pre-charged to multiplexer MUXB, there are also multiplexer MUXA~MUXB to the number of display panel
The situation of pre-arcing is carried out according to line, can the rest may be inferred, therefore do not repeated separately in this.
It is according to yet another preferred embodiment of the present invention a kind of display panel drive control method.In this embodiment,
Display panel drive control method passes through a plurality of data in multiplexer driving display panel to control source electrode driver output
Line.
Figure 11 is please referred to, Figure 11 shows the flow chart of display panel drive control method in this embodiment.As shown in figure 11,
Display panel drive control method may include the following steps:
Step S10: under first time, starting to be pre-charged by timing control signal starting to multiplexer, wherein
Multiplexer receives first voltage level in first time；
Step S12: under the second time, multiplexer receives second voltage level, wherein the second time was later than at the first time
And second voltage level is higher than first voltage level；And
Step S14: under the third time, multiplexer receives tertiary voltage level, and wherein the third time was later than for the second time
And tertiary voltage level is higher than second voltage level.
It should be noted that multiplexer is risen to the tertiary voltage level of third time by the second voltage level of the second time
Speed can be greater than multiplexer be risen to by the first voltage level of first time the second time second voltage level speed.
That is, the multiplexer being in close state originally receives first voltage level in first time and partially opens, and multiplexing
Device voltage level received by from first time to the third time is presented exponential type and increases, until multiplexer is indirect when third
Receive tertiary voltage level and until fully opening.
In practical application, the rising edge of timing control signal at the first time also triggering simultaneously in display panel should
Multiple data lines start to charge.Since the presentation of multiplexer voltage level received by from first time to the third time refers to
Number type increases, and therefore, multiplexer is carried out since at the first time with data line of the exponential type pre-charge curve to display panel pre-
Charging, until multiplexer can just stop to display when the third time receiving tertiary voltage level and being in fully open state
The data line of panel is pre-charged.
For example, as shown in Figure 10, (SWA is that the voltage of the same phase of multiplexer MUXA is put to the first timing control signal SWA
Big signal, so not marking) rising edge triggered in time t1 and start to carry out precharge and multiplexer MUXA to multiplexer MUXA
First voltage level VGL is received in time t1；Then, multiplexer MUXA in time tx receive second voltage level Vx, wherein when
Between tx be later than first time t1 and second voltage level Vx and be higher than first voltage level VGL；Then, multiplexer MUXA is in time t2
Tertiary voltage level VGH is received, wherein time t2 is later than time tx and tertiary voltage level VGH is higher than second voltage level Vx.
Since multiplexer MUXA can be big by the speed of the second voltage level Vx of the time tx tertiary voltage level VGH for rising to time t2
The speed of the second voltage level Vx of time tx is risen to by the first voltage level VGL of time t1 in multiplexer MUXA, that is,
During the precharge of time t1 to time t2, index is presented in voltage level received by the multiplexer MUXA that part is opened
Type variation, therefore, part open multiplexer MUXA can since time t1 with exponential type pre-charge curve to display panel
Data line is pre-charged, until time t2.
Similarly, multiplexer the situation of pre-arcing is carried out to the data line of display panel also can the rest may be inferred.Example is held, is shown
Panel driving control method also may include the following steps:
Under the 4th time, triggering multiplexer starts to carry out pre-arcing, wherein the 4th time was later than third time and multiplexing
Device receives tertiary voltage level in the 4th time；
Under the 5th time, multiplexer receives the 4th voltage level, wherein the 5th time was later than the 4th time and the 4th electricity
Voltage level is lower than tertiary voltage level；And
Under the 6th time, multiplexer receives first voltage level, wherein the 6th time was later than the 5th time and the first electricity
Voltage level is lower than the 4th voltage level.
Similarly, multiplexer is dropped to the speed of the first voltage level of the 6th time by the 4th voltage level of the 5th time
Degree can be greater than the speed that multiplexer is dropped to the 4th voltage level of the 5th time by the tertiary voltage level of the 4th time, that is,
Multiplexer voltage level received by the 4th time to the 6th time is presented exponential type and reduces.
Compared to the prior art, in voltage level converting of the invention and display panel drive control method, when
The rising edge of sequence control signal is other than triggering source electrode driver output starts outputting data signals to fan out unit charging, also
When triggering the unlatching of multiplexer part simultaneously and starting to be pre-charged one section with data line of the exponential type pre-charge curve to display panel
Between after fully open multiplexer again to data line charges electricity.
Since the present invention is before fully opening multiplexer to the data line charging of display panel, first multiplexing can be opened in part
Device is pre-charged the data line of display panel, can not only extend effective charging time of data line and become the charging of data line
Relatively linearly, the phenomenon that can also reducing the immediate current of data line when fully opening multiplexer and voltage is avoided to decline appearance.
Therefore, voltage level converting of the invention and display panel drive control method can effectively promote display surface
The pixel charge rate of plate simultaneously substantially eliminates noise for touch panel, and stylus is smoothly operated on touch panel.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (20)
1. a kind of display panel drive control method, to drive the multiple data lines in a display panel by a multiplexer,
It is characterized in that, the display panel drive control method comprises the steps of
(a) under a first time, the multiplexer is started to be pre-charged by timing control signal starting, wherein this is more
Work device receives a first voltage level in this at the first time；
(b) under one second time, which receives a second voltage level, and wherein second time is later than the first time
And the second voltage level is higher than the first voltage level；And
(c) under the third time, which receives a tertiary voltage level, and wherein the third time is later than second time
And the tertiary voltage level is higher than the second voltage level；
Wherein, which is risen to the tertiary voltage level of third time by the second voltage level of second time
Speed be greater than the multiplexer by the first voltage level of the first time rise to second time the second voltage electricity
Flat speed.
2. display panel drive control method as described in claim 1, which is characterized in that wherein according to step (a) this when
A rising edge (Rising edge) triggering of sequence control signal is pre-charged the multiplexer.
3. display panel drive control method as described in claim 1, which is characterized in that wherein step (c) also includes:
When the multiplexer receives the tertiary voltage level, stopping is pre-charged the multiplexer.
4. display panel drive control method as described in claim 1, which is characterized in that wherein the multiplexer in this first when
Between be in close state.
5. display panel drive control method as described in claim 1, which is characterized in that wherein the multiplexer in this second when
Between be in partially open state.
6. display panel drive control method as described in claim 1, which is characterized in that wherein the multiplexer is when the third
Between be in fully open state.
7. display panel drive control method as described in claim 1, which is characterized in that further include the following steps:
(d) under the first time, according to the timing control signal, also triggering starts to charge to the multiple data lines simultaneously.
8. display panel drive control method as claimed in claim 7, which is characterized in that wherein according to step (d) this when
The rising edge triggering starting of sequence control signal starts to charge to the multiple data lines.
9. display panel drive control method as described in claim 1, which is characterized in that further include the following steps:
Under tetra- time of Yu Yi, trigger the multiplexer start carry out pre-arcing, wherein the 4th time be later than the third time and
The multiplexer receives the tertiary voltage level in the 4th time；
Under five time of Yu Yi, the multiplexer receive one the 4th voltage level, wherein the 5th time be later than the 4th time and
4th voltage level is lower than the tertiary voltage level；And
Under six time of Yu Yi, which receives the first voltage level, wherein the 6th time be later than the 5th time and
The first voltage level is lower than the 4th voltage level.
10. display panel drive control method as claimed in claim 9, which is characterized in that wherein the multiplexer is by the 5th
The speed that the 4th voltage level of time drops to the first voltage level of the 6th time be greater than the multiplexer by this
The tertiary voltage level of four times drops to the speed of the 4th voltage level of the 5th time.
11. a kind of voltage level converting couples the multiple data lines in a display panel by a multiplexer, feature exists
In the voltage level converting includes:
One voltage level conversion unit, couple the multiplexer and receive respectively a first voltage level, a second voltage level and
One tertiary voltage level, wherein the tertiary voltage level be higher than the second voltage level and the second voltage level be higher than this first
Voltage level；And
One control unit couples the voltage level conversion unit, to be selected according to a voltage level of a timing control signal
Property controlling the voltage level conversion unit exports the first voltage level or the second voltage level to the multiplexer.
12. voltage level converting as claimed in claim 11, which is characterized in that wherein being somebody's turn to do when the timing control signal
When voltage level is low level, which controls the voltage level conversion unit and exports the first voltage level to the multiplexing
Device.
13. voltage level converting as claimed in claim 11, which is characterized in that wherein being somebody's turn to do when the timing control signal
When voltage level is high level, which controls the voltage level conversion unit and exports the second voltage level to the multiplexing
Device, to be pre-charged to the multiplexer.
14. voltage level converting as claimed in claim 13, which is characterized in that also include:
One feedback unit is respectively coupled to the multiplexer and the control unit, to the multiplexer that judges to be pre-charged whether
Reach a reference voltage；
Wherein, if above-mentioned judging result be it is yes, which controls the voltage level conversion unit and exports the tertiary voltage
Level is to the multiplexer.
15. voltage level converting as claimed in claim 11, which is characterized in that also include:
One storage unit couples the control unit, to store a presupposed information；
Wherein, when the voltage level of the timing control signal is high level, the control unit is according to the presupposed information in one
The voltage level conversion unit is controlled in preset time exports the second voltage level to the multiplexer, to carry out to the multiplexer
Precharge, at the end of the preset time, which controls the voltage level conversion unit and exports the tertiary voltage level
To the multiplexer.
16. voltage level converting as claimed in claim 15, which is characterized in that wherein the storage unit be it is muptiple-use can
Program (Multi-Time Programming, MTP) circuit.
17. a kind of voltage level converting couples the multiple data lines in a display panel by a multiplexer, feature exists
In the voltage level converting includes:
One partial pressure unit receives a first voltage level, a second voltage level and a tertiary voltage level respectively and produces accordingly
Raw multiple candidate voltage levels, wherein the tertiary voltage level be higher than the second voltage level and the second voltage level be higher than should
First voltage level；
One voltage level conversion unit is respectively coupled to the multiplexer and the partial pressure unit, to receive multiple candidate voltage electricity
It is flat；And
One control unit couples the voltage level conversion unit, to be selected according to a voltage level of a timing control signal
Property control the multiple candidate voltage level of voltage level conversion unit output to the multiplexer.
18. voltage level converting as claimed in claim 17, which is characterized in that the wherein voltage level conversion unit packet
Containing multiple operational amplifiers, which also exports a thrust control signals to the voltage level conversion unit, uses control
Multiple operational amplifier provides the corresponding multiple candidate voltage level of thrust output to the multiplexer, causes multiple time
Voltage level is selected to form an exponential type pre-charge curve.
19. voltage level converting as claimed in claim 17, which is characterized in that also include:
One storage unit couples the control unit, to store a presupposed information；
Wherein, when the voltage level of the timing control signal is high level, the control unit is according to the presupposed information in extremely
The voltage level conversion unit is controlled in a few preset time exports at least one candidate voltage level respectively to the multiplexer, with
The multiplexer is pre-charged, at the end of this at least a preset time, which controls the voltage level conversion list
Member exports the tertiary voltage level to the multiplexer.
20. voltage level converting as claimed in claim 19, which is characterized in that wherein the storage unit be it is muptiple-use can
Programmed circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW107136407A TWI680394B (en) | 2018-10-16 | 2018-10-16 | Voltage level shifter cirucit and display panel driving control method |
| TW107136407 | 2018-10-16 |
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| CN109410822B CN109410822B (en) | 2021-09-03 |
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| CN112820230A (en) * | 2020-07-13 | 2021-05-18 | 友达光电股份有限公司 | Display panel |
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| TWI758600B (en) | 2019-04-09 | 2022-03-21 | 友達光電股份有限公司 | Display panel and display panel driving method |
| TWI793844B (en) * | 2020-11-06 | 2023-02-21 | 聯詠科技股份有限公司 | Method for driving display panel and related driver circuit |
| TWI800106B (en) * | 2021-11-22 | 2023-04-21 | 友達光電股份有限公司 | Multiplexer circuit, display panel and driving method using the same |
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Also Published As
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| TW202016705A (en) | 2020-05-01 |
| TWI680394B (en) | 2019-12-21 |
| CN109410822B (en) | 2021-09-03 |
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