CN105719604B - Method for improving panel automatic updating picture flicker of display panel and control circuit thereof - Google Patents
Method for improving panel automatic updating picture flicker of display panel and control circuit thereof Download PDFInfo
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- CN105719604B CN105719604B CN201410718631.7A CN201410718631A CN105719604B CN 105719604 B CN105719604 B CN 105719604B CN 201410718631 A CN201410718631 A CN 201410718631A CN 105719604 B CN105719604 B CN 105719604B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000004973 liquid crystal related substance Substances 0.000 claims description 27
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims 1
- 230000003111 delayed effect Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Abstract
The invention provides a method for improving the flicker of a panel automatic update picture of a display panel, which comprises the following steps: generating an extended frame (frame) to synchronize a panel display signal of the panel with an external display signal when the panel is shifted from the panel auto-refresh mode to the normal mode; before generating the extended frame, a delayed frame is generated according to the last frame of the panel automatic update mode. Then, in the display time of the delayed picture, the brightness of the delayed picture is calculated according to the driving voltage of the panel and the time of the delayed picture. Then, the brightness of the extended picture is adjusted according to the brightness of the delayed picture, so that the brightness of the extended picture is the same as that of the delayed picture. Therefore, the problem of flickering of the automatically updated picture of the panel is improved.
Description
Technical field
The present invention is related to a kind of display panel, Qie Te Do be it is a kind of improve panel automatically update film flicker method and
Its control circuit.
Background technology
Embedded display port (embedd DisplayPort, the eDP) mark of VESA (VESA) issue
Quasi- specification has been subjected to multiple evolution, and latest edition is the eDP 1.3 that delivers of in January, 2011 at present, VESA
(VESA) still in Continuous optimization.Wherein, eDP 1.3 editions adds panel and automatically updates (Panel Self Refresh, PSR) work(
Can, allow graphics processing unit (GPU) to be able in picture still, the transmission between cut-out and panel, graphics process list is greatly reduced
The computing power consumption of member, extend service time of battery.User is carrying out browsing the general document work such as webpage, reading file, typewriting
During industry, graphics processing unit can all automatically update pattern (PSR Mode) into panel, to reach power saving effect.
Fig. 1 is refer to, Fig. 1 is the schematic diagram of the control framework of traditional liquid crystal display.Display card 11 is included at figure
Manage unit 111, the embedded display transmitter (eDP_Tx, or be ePD Transmitter) 1111 of graphics processing unit 111
Transmission is outside to show signal Input_DE to time schedule controller (eDP T-CON) 12.Time schedule controller (eDP T-CON) 12 includes
Embedded display receiver (eDP_Rx, or be ePD Receiver) 121, digital signal processor (DSP) 122 delay with picture
Rush device (Frame Buffer) 123.Time schedule controller 12 refers to outside display signal Input_DE and produces multiple signals to liquid
Brilliant drive circuit 13, such as output enable signal OE, drive voltage signal OD, signal GCK and synchronizing signal STV are with control gate
The conducting state of pole.Local side must be included by supporting the time schedule controller 12 for the liquid crystal display (LCD) for automatically updating framework
Frame buffer memory 123, so as to cut off between the time schedule controller of panel 12 in graphics processing unit 111 transmission before, will
Last picture (Frame) of normal mode is deposited into picture buffer 123, and in graphics processing unit 111 without transmission picture
During face, the picture in picture buffer 123 is directly displayed by time schedule controller 12.Picture buffer 123 may, for example, be storage
Device.
Fig. 2 is refer to, Fig. 2 is that traditional panel of LCD enters panel certainly by normal mode (Normal Mode)
Dynamic generation patterns (PSR Mode) return the signal waveforms of normal mode.In normal mode, and it is automatic when entering panel
During generation patterns, outside shows that signal Input_DE stops, and time schedule controller, which voluntarily produces, automatically updates signal PSR_DE to face
Plate shows signal Tx_DE, and produces synchronizing signal STV to liquid crystal display drive circuit with reference to Display panel signal Tx_DE.Because by face
It is random that plate, which automatically updates pattern to enter normal mode, so outside display signal Input_DE is stochastic inputs, but panel
Display signal Tx_DE must terminate last and automatically update signal PSR_DE, and signal Input_DE, institute are shown referring again to outside
First outside display signal Input_DE of normal mode can be ignored with time schedule controller, synchronizing signal STV is delayed output,
Longer (1+ α) picture (frame) of generation time (or to extend picture), therefore cause film flicker problem.
Fig. 3 is refer to, Fig. 3 is the oscillogram of the voltage of the liquid crystal capacitance of traditional panel of LCD.Extending picture
During face ((1+ α) picture), grid high potential (Gate High Voltage, VGH) sequential not because the time of picture is longer and
Elongated, (Blanking Interval) is elongated during only hiding from view, and during this change, can be appreciated that picture moment flashes.Reason
Analyze in rear.Human eye is brightness to the sensation of light, brill nit=cd/m2.Because the area of observation is identical, so sense
The luminance difference being subject to is caused by luminous intensity (cd) difference, and luminous intensity is equally applied to the voltage of liquid crystal capacitance.Because people
Eye has visual persistence effect, so the brightness of each picture is defined asWherein V is liquid crystal capacitance voltage, and T is picture
Time.The picture for automatically updating pattern and the liquid crystal discharge and recharge situation for extending picture are as shown in Figure 3.Analyze the two pictures
Luminance difference is (by source voltage VSThe area A formed and the influence of area B), according to the characteristic of liquid crystal discharge and recharge, extend picture
Time more other pictures length, therefore V2<V1, therefore
Wherein, V1It is the liquid crystal capacitance voltage liquid crystal capacitance voltage of picture (and delay) for the pattern that automatically updates, T1It is certainly
The cycle of a gate line (Gate Line) (GCK) for dynamic renewal picture (PSR pictures), V2It is the liquid crystal capacitance for extending picture
Voltage, T2It is the cycle time for extending picture.In T1、T2In period, liquid crystal capacitance voltage V1、V2Absolute value all persistently reduce.
Therefore the luminance difference that eye-observation flashes to moment is：The brightness for automatically updating picture is more than the brightness for extending picture.Especially,
For the vision of human eye, luminance difference during low-light level is easier to be discovered by people.In addition, in figure 3, VCOMIt is common electric voltage,
VDIt is drain voltage, VSIt is the source voltage electric crystal source electrode of panel (connection liquid crystal capacitance), VGIt is grid voltage.
The content of the invention
The embodiment of the present invention provides a kind of method that panel for improving display panel automatically updates film flicker, comprising following
Step：When display panel automatically updates pattern by panel enters normal mode, produce and extend picture (frame) so that display surface
The Display panel signal of plate shows that signal is synchronous with outside；Before extension picture is produced pattern is automatically updated according to panel most
The latter picture produces a delay picture；Within the display time of delay picture, driving voltage and delay according to display panel
The time of picture and the brightness of computing relay picture；Brightness adjustment according to delay picture extends the brightness of picture, makes extension picture
Brightness of the brightness in face with postponing picture is identical.
The embodiment of the present invention provides a kind of control circuit, is asked to improve the film flicker that automatically updates of a display panel
Topic, the control circuit receives outside display signal to produce Display panel signal, when display panel automatically updates mould by panel
When formula enters normal mode, generation extends picture (frame) so that Display panel signal shows that signal is synchronous with outside, and control is electric
Road includes memory and processing unit.Memory storage is entered when panel automatically updates pattern just when panel by normal mode
Last picture of norm formula.Processing unit automatically updates last of pattern before extension picture is produced according to panel
Picture produces a delay picture, and within the display time of delay picture, driving voltage and delay picture according to display panel
Time and computing relay picture brightness, and according to delay picture brightness adjustment extend picture brightness, make extension picture
Brightness with postpone picture brightness it is identical.
In summary, the embodiment of the present invention provides a kind of method that panel for improving display panel automatically updates film flicker
And its control circuit, delay picture when display panel automatically updates pattern by panel and enters normal mode, is being produced, and count
The brightness of delay picture is calculated, and adjusts the brightness for extending picture accordingly, makes the brightness of extension picture and the brightness phase of other pictures
Together.Thereby, the problem of panel automatically updates film flicker is improved.
Brief description of the drawings
Fig. 1 is the schematic diagram of the control framework of traditional liquid crystal display；
Fig. 2 is that traditional panel of LCD by normal mode enters panel and automatically updates pattern and returns normal mode
Signal waveforms；
Fig. 3 is the oscillogram of the voltage of the liquid crystal capacitance of traditional panel of LCD；
Fig. 4 is the flow that the panel of improvement display panel provided in an embodiment of the present invention automatically updates the method for film flicker
Figure；
Fig. 5 is that panel of LCD provided in an embodiment of the present invention enters panel by normal mode and automatically updates pattern again
Return to the signal waveforms of normal mode；
Fig. 6 is that panel of LCD provided in an embodiment of the present invention enters panel by normal mode and automatically updates pattern again
Return to the signal waveforms of normal mode；
Fig. 7 is the oscillogram of the voltage of the liquid crystal capacitance of panel of LCD provided in an embodiment of the present invention；
Fig. 8 is that the panel of LCD that another embodiment of the present invention provides enters panel by normal mode and automatically updates mould
Formula returns the schematic diagram of the driving voltage of normal mode.
Wherein, reference：
11：Display card
111：Graphics processing unit
12：Time schedule controller
13：Liquid crystal display drive circuit
1111：Embedded display transmitter
121：Embedded display receiver
122：Digital signal processor
123：Picture buffer
Input_DE：Outside shows signal
OE：Export enable signal
OD：Drive voltage signal
GCK：Signal
STV、New_STV、Old_STV：Synchronizing signal
PSR_DE：Automatically update signal
Tx_DE：Display panel signal
A、B：Area
V1、V2：Liquid crystal capacitance voltage
T1、T2：During hiding from view
VCOM：Common electric voltage
VD：Drain voltage
VS：Source voltage
VG：Grid voltage
VGH：Grid high potential
S410、S420、S430：Steps flow chart
W1、W2：Width
VA、VB：Driving voltage
Embodiment
(panel of improvement display panel automatically updates the embodiment of the method for film flicker)
Fig. 4 is refer to, Fig. 4 is the flow for the method that improvement panel provided in an embodiment of the present invention automatically updates film flicker
Figure.Because when returning to normal mode (Normal mode) by automatically updating pattern (PSR Mode), human eye can experience picture
The difference of brightness, the present embodiment provides a kind of method for improving panel and automatically updating film flicker, for a display panel, when aobvious
When showing that panel automatically updates pattern by panel and enters normal mode, produce and extend picture (extending frame, (1+ α)
Frame) so that the Display panel signal of display panel shows that signal is synchronous with outside.And carry out following steps.First, in step
In rapid S410, last picture for automatically updating pattern according to panel before extension picture is produced produces delay picture.This
The flow of embodiment can be divided into two benches and reach, and the first stage is step S410, as shown in Fig. 5 oscillogram, will enter normal
One picture of time delay of pattern, the amendment for making time schedule controller (T-CON) there is time enough to do second stage, produce
The method for postponing picture is as follows：When panel enters normal mode by automatically updating pattern, outside shows signal Input_DE again
Output signal, when time schedule controller (T-CON) receives outside display signal Input_DE, prolong the latter picture and enter normal mode
Formula.Namely extension picture is produced again after postponing pictures with reference to the sequential for the pattern that automatically updates, more one, works.As shown in figure 5, phase
It compared with traditional synchronizing signal Old_STV, can be seen that by the synchronizing signal New_STV of the present embodiment, inserted before picture is extended
A delay picture is entered.
Then, step S420 is carried out.In the step s 420, within the display time of delay picture, the driving according to panel
Voltage and the brightness for postponing the time of picture and computing relay picture.In the present embodiment, postpone the brightness of picture with extending picture
Brightness be using following formula calculate：
Wherein, V is liquid crystal capacitance voltage, and T is the time of picture.
Then, step S430 is carried out.In step S430, the brightness adjustment according to delay picture extends the brightness of picture,
Make brightness of the brightness of extension picture with postponing picture identical.Specifically, according to above describing and can learn, picture is automatically updated
Brightness be more than extend picture brightness be due to,
Therefore there are two methods to correct the brightness for extending picture.First method：Need grid high potential VGHTime
Increase, to avoid extending the liquid crystal capacitance voltage V of picture2Reduce too many and cause the Liang Du Minus for extending picture few.Second of side
Method：The driving voltage for directly lifting panel of LCD (is usually the drain voltage V of panel transistorD), and make liquid crystal electric
It (is typically the source voltage V of panel transistor to hold voltageS) lifting, thereby increase the brightness for extending picture.
On above-mentioned first method, step S430 can include, and the brightness increase according to delay picture is extending picture
The gate turn-on time of the panel in face, so that it is identical to extend brightness of the brightness of picture with postponing picture.Referring to Fig. 1,
Fig. 5 and Fig. 6, when time schedule controller 12 receives outside display signal Input_DE, in addition to more one delay picture of work,
During extending picture, shorten output enable signal OE (High) width, make width W1>W2, width W2 are with extension picture
Time and (i.e. as the α times adjust, or adjust with the 1+ α times), with the brightness of increase extension picture, make extension picture
Brightness it is identical with the brightness of previous picture (delay picture).That is, the grid in the display panel for extending picture is led
The logical time adjusts with the time for extending picture, extends the brightness of picture with increase.Specifically, the signal GCK in Fig. 6 is
To compared with exporting enable signal OE, and obtain gate-on signal VG.As shown in fig. 7, work as gate-on signal VGMake grid
During ON time increase, then it is increased during the liquid crystal charging for extending picture, so makes liquid crystal capacitance voltage V2Then holding and V1Phase
Together.Thereby,
Then postpone picture (delay frame) and be equal to extension picture ((1+ α) frame).
On above-mentioned second method, step S430 can include, and the brightness increase according to delay picture is extending picture
The driving voltage of the panel in face (is typically the drain voltage V of panel transistorD), so as to extend brightness and the delay picture of picture
Brightness it is identical.In practical application, reference picture 8, establishes overvoltage driving look-up table (Over Driving Lookup-
Table), it is assumed that former write driver voltage is VA, because during pattern is automatically updated, the picture buffer at display end
(Frame buffer) has had picture, and when postponing picture, time schedule controller (T-CON) is tabled look-up with reference to α values, is being extended
Outputting drive voltage signal OD writes the driving voltage V of liquid crystal display drive circuit during pictureB, as shown in figure 8, extending the driving of picture
Voltage (VB) it is more than the driving voltage (V of delay pictureA).Therefore liquid crystal capacitance storage can make the extension after write-in then compared with multi-charge
The brightness of picture is identical with the brightness of previous delay picture and other pictures.Briefly, overvoltage driving can be established to look into
Table (Over Driving Lookup-table) is looked for, the driving voltage (V according to delay pictureA) and overvoltage driving look-up table,
Obtain the driving voltage (V for the panel for extending pictureB).It is noted that the look-up table can for example be stored in Fig. 1 number
The electronics that the built-in memory of word signal processor 122 is either for example stored in this external digital signal processor 122 is erased
Formula can make carbon copies read-only storage (EEPROM), but the present invention and be not so limited, and store the memory species of look-up table with setting
Position can change according to being actually needed.
(panel of improvement display panel automatically updates the embodiment of the control circuit of film flicker)
Referring to Fig. 1, Fig. 4 and Fig. 5, according to the explanation of previous embodiment, the present embodiment provides a kind of control circuit,
Film flicker is automatically updated to improve the panel of a display panel, the control circuit receives outside display signal Input_DE
To produce Display panel signal Tx_DE, when display panel automatically updates pattern by panel enters normal mode, produce and extend picture
Face (frame) is so that Display panel signal Tx_DE shows that signal Input_DE is synchronous with outside.The control circuit for example including
Memory (such as Fig. 1 picture buffer 123) and processing unit (digital signal processor 122 as shown in Figure 1).Memory
Store when display panel is entered by normal mode last picture of normal mode when panel automatically updates pattern.Numeral letter
Number processor 122 produce extend picture before automatically update according to panel last picture of pattern and produce a delay picture
Face, and within the display time of delay picture, the computing relay according to the driving voltage of display panel and the time of delay picture
The brightness of picture, and the brightness of the brightness adjustment extension picture according to delay picture, make brightness and the delay picture of extension picture
Brightness it is identical.On how to calculate the brightness of picture, and how according to the bright of the brightness adjustment extension picture for postponing picture
Degree, refer to the explanation of previous embodiment, repeats no more.
(possibility effect of embodiment)
In summary, the method that the panel for the improvement display panel that the embodiment of the present invention is provided automatically updates film flicker
And its control circuit, delay picture when display panel automatically updates pattern by panel and enters normal mode, is being produced, and count
The brightness of delay picture is calculated, and increases extension picture using the gate turn-on time or driving voltage that change display panel accordingly
Liquid crystal capacitance charging, make the brightness of extension picture identical with the brightness of other pictures.Thereby, improve panel and automatically update picture
The problem of flicker.
Claims (11)
1. a kind of method that panel for improving display panel automatically updates film flicker, it is characterised in that comprise the following steps：
When the display panel automatically updates pattern by a panel enters a normal mode, produce one and extend picture so that the display
One Display panel signal of panel shows that signal is synchronous with an outside；
Last picture for automatically updating pattern according to the panel before the extension picture is produced produces a delay picture；
Within the display time of the delay picture, calculated according to the driving voltage of the display panel with the time of the delay picture
The brightness of the delay picture；And
According to the brightness of the brightness adjustment of the delay picture extension picture, make brightness and the delay picture of the extension picture
Brightness is identical.
2. improve the method that the panel of display panel automatically updates film flicker according to claim 1 is asked, it is characterised in that this prolongs
The slow brightness of picture with the brightness of the extension picture is calculated using following formula：
<mrow>
<mfrac>
<mrow>
<mo>&Integral;</mo>
<mi>VdT</mi>
</mrow>
<mi>T</mi>
</mfrac>
<mo>;</mo>
</mrow>
Wherein, V is liquid crystal capacitance voltage, and T is the time of picture.
3. improve the method that the panel of display panel automatically updates film flicker according to claim 1 is asked, it is characterised in that foundation
The step of brightness of the brightness adjustment of the delay picture extension picture, includes：
According to the delay picture brightness increase the extension picture the display panel the gate turn-on time so that the extension
The brightness of picture is identical with the brightness of the delay picture.
4. improve the method that the panel of display panel automatically updates film flicker according to claim 3 is asked, it is characterised in that at this
The gate turn-on time for extending the display panel of picture adjusts with the time of the extension picture, extends picture with increase
Brightness.
5. improve the method that the panel of display panel automatically updates film flicker according to claim 1 is asked, it is characterised in that foundation
The step of brightness of the brightness adjustment of the delay picture extension picture, includes：
Brightness according to the delay picture increases the driving voltage in the display panel of the extension picture, so that the extension picture
Brightness it is identical with the brightness of the delay picture.
6. improve the method that the panel of display panel automatically updates film flicker according to claim 5 is asked, it is characterised in that more wrap
Include：
Overvoltage driving look-up table is established, according to driving voltage and the overvoltage driving look-up table of the delay picture, is obtained
The driving voltage of the display panel of the extension picture.
7. improve the method that the panel of display panel automatically updates film flicker according to claim 1 is asked, it is characterised in that when this
When display panel enters the panel by the normal mode and automatically updates pattern, last picture of the normal mode is deposited into one
In memory, and in the display panel automatically updates pattern, last picture of the normal mode is shown.
8. a kind of control circuit, film flicker problem is automatically updated to improve a display panel, the control circuit receives one
Outside shows that to produce a Display panel signal, a normal mode is entered when the display panel automatically updates pattern by a panel for signal
During formula, produce one and extend picture so that the Display panel signal shows that signal is synchronous with the outside, it is characterised in that control electricity
Road includes：
One memory, store when the display panel is entered by the normal mode normal mode when panel automatically updates pattern
Last picture；And
One processing unit, last picture for automatically updating pattern according to the panel before the extension picture is produced produce one
Postpone picture, and within the display time of the delay picture, according to the display panel driving voltage and the delay picture when
Between and calculate the brightness of the delay picture, and according to the brightness of the brightness adjustment of the delay picture extension picture, make the extension
The brightness of picture is identical with the brightness of the delay picture.
9. basis asks claim 8 control circuit, it is characterised in that further includes：
One drive circuit, it is controlled by the processing unit, to control the driving voltage of the display panel and gate turn-on time.
10. basis asks claim 8 control circuit, it is characterised in that brightness increase of the processing unit according to the delay picture
In the gate turn-on time of the display panel of the extension picture.
11. basis asks claim 8 control circuit, it is characterised in that brightness increase of the processing unit according to the delay picture
In the driving voltage of the display panel of the extension picture.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103132086 | 2014-09-17 | ||
| TW103132086A TW201612883A (en) | 2014-09-17 | 2014-09-17 | Method of improving flicker of panel self reflash of a display panel and control circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105719604A CN105719604A (en) | 2016-06-29 |
| CN105719604B true CN105719604B (en) | 2017-12-12 |
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| CN201410718631.7A Expired - Fee Related CN105719604B (en) | 2014-09-17 | 2014-12-01 | Method for improving panel automatic updating picture flicker of display panel and control circuit thereof |
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|---|---|---|---|---|
| CN106371959B (en) * | 2016-08-30 | 2019-06-04 | 硅谷数模半导体（北京）有限公司 | Show test method and device |
| CN110738970B (en) * | 2018-01-22 | 2021-05-18 | 青岛海信移动通信技术股份有限公司 | Page refreshing method and device for ink screen |
| CN109389958B (en) | 2018-12-12 | 2020-07-07 | 惠科股份有限公司 | Display panel driving method and driving device and display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101365053A (en) * | 2007-08-08 | 2009-02-11 | 佳能株式会社 | Image processing apparatus and method of controlling the same |
| CN101908326A (en) * | 2010-02-09 | 2010-12-08 | 华映视讯（吴江）有限公司 | The driving method of display panel and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101096708B1 (en) * | 2004-11-16 | 2011-12-22 | 엘지디스플레이 주식회사 | Liquid crystal display and driving method thereof |
| JP4376764B2 (en) * | 2004-12-01 | 2009-12-02 | 三菱電機株式会社 | Stereoscopic image display device |
| JP2011221146A (en) * | 2010-04-06 | 2011-11-04 | Seiko Epson Corp | Liquid crystal device and controlling method for the same |
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2014
- 2014-09-17 TW TW103132086A patent/TW201612883A/en unknown
- 2014-12-01 CN CN201410718631.7A patent/CN105719604B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101365053A (en) * | 2007-08-08 | 2009-02-11 | 佳能株式会社 | Image processing apparatus and method of controlling the same |
| CN101908326A (en) * | 2010-02-09 | 2010-12-08 | 华映视讯（吴江）有限公司 | The driving method of display panel and display device |
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| CN105719604A (en) | 2016-06-29 |
| TW201612883A (en) | 2016-04-01 |
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