CN105719604A - 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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- CN105719604A CN105719604A CN201410718631.7A CN201410718631A CN105719604A CN 105719604 A CN105719604 A CN 105719604A CN 201410718631 A CN201410718631 A CN 201410718631A CN 105719604 A CN105719604 A CN 105719604A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000004973 liquid crystal related substance Substances 0.000 claims description 28
- 230000003111 delayed effect Effects 0.000 abstract 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005055 memory storage Effects 0.000 description 2
- 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
- 230000006870 function Effects 0.000 description 1
- 238000002372 labelling Methods 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 floater, and spy is that a kind of panel that improves automatically updates method and the control circuit thereof of film flicker.
Background technology
Embedded display port (the embeddDisplayPort that VESA (VESA) issues, eDP) standard specifications is through repeatedly evolution, current latest edition is the eDP1.3 delivered in January, 2011, in VESA (VESA) still Continuous optimization.Wherein, eDP1.3 version addition panel automatically updates (PanelSelfRefresh, PSR) function, Graphics Processing Unit (GPU) is allowed to be able to when picture still, transmission between cut-out and panel, is greatly reduced the computing power consumption of Graphics Processing Unit, extends service time of battery.User is when carrying out browsing the generally document operation such as webpage, reading file, typewriting, and Graphics Processing Unit all can enter panel and automatically update pattern (PSRMode), to reach power saving effect.
Refer to the schematic diagram controlling framework that Fig. 1, Fig. 1 are traditional liquid crystal displays.Display card 11 includes Graphics Processing Unit 111, the embedded display transmitter of Graphics Processing Unit 111 (eDP_Tx, or be called ePDTransmitter) 1111 transmits outside display signal Input_DE to time schedule controller (eDPT-CON) 12.Time schedule controller (eDPT-CON) 12 includes embedded display receiver (eDP_Rx, or be called ePDReceiver) 121, digital signal processor (DSP) 122 and picture buffer (FrameBuffer) 123.Time schedule controller 12 is referred to outside display signal Input_DE and produces multiple signals to liquid crystal display drive circuit 13, for instance output enable signal OE, drive voltage signal OD, signal GCK and synchronizing signal STV are with the conducting state of control gate.The time schedule controller 12 supporting the liquid crystal display (LCD) automatically updating framework must include the frame buffer memory 123 of local side, to cut off and before transmission between the time schedule controller 12 of panel in Graphics Processing Unit 111, last picture (Frame) of normal mode is deposited in picture buffer 123, and when Graphics Processing Unit 111 is without transmission picture, time schedule controller 12 directly display the picture in picture buffer 123.Picture buffer 123 can be such as memorizer.
Refer to Fig. 2, Fig. 2 to be traditional panel of LCD entered panel by normal mode (NormalMode) and automatically update pattern (PSRMode) and return the signal waveforms of normal mode.When normal mode, and when entering panel and automatically updating pattern, outside display signal Input_DE stops, and time schedule controller produces to automatically update signal PSR_DE to Display panel signal Tx_DE voluntarily, and produces synchronizing signal STV to liquid crystal display drive circuit with reference to Display panel signal Tx_DE.It is random because being automatically updated pattern entrance normal mode by panel, so outside display signal Input_DE is stochastic inputs, but Display panel signal Tx_DE must terminate last automatically updates signal PSR_DE, signal Input_DE is shown referring again to outside, so time schedule controller can ignore first outside display signal Input_DE of normal mode, synchronizing signal STV is made to delay output, (1+ α) picture (frame) (or being called prolongation picture) that the generation time is longer, thus results in film flicker problem.
Refer to the oscillogram of voltage that Fig. 3, Fig. 3 are the liquid crystal capacitances of traditional panel of LCD.Extending picture ((1+ α) picture) period, grid high potential (GateHighVoltage, VGH) sequential not because the time of picture is longer and elongated, only hide from view period (BlankingInterval) elongated, in this change during, can be appreciated that picture moment glimmers.The analysis of causes is in rear.The human eye brightness that is felt as to light, brill is nit=cd/m2.Area owing to observing is identical, so the luminance difference experienced is caused by light intensity (cd) difference, and light intensity is equal to the voltage being applied to liquid crystal capacitance.Because human eye has visual persistence effect, so the brightness of each picture is defined asWherein V is liquid crystal capacitance voltage, and T is the time of picture.The picture automatically updating pattern and the liquid crystal discharge and recharge situation extending picture are as shown in Figure 3.The luminance difference analyzing the two picture (is subject to source voltage VSThe area A formed and the impact of area B), according to the characteristic of liquid crystal discharge and recharge, the time extending picture, relatively other picture was long, therefore V2<V1, therefore
Wherein, V1It is the liquid crystal capacitance voltage (being also the liquid crystal capacitance voltage postponing picture) automatically updating pattern, T1It is the cycle of the gate line (GateLine) (GCK) automatically updating picture (PSR picture), V2It is the liquid crystal capacitance voltage extending picture, T2It it is the cycle time extending picture.At T1、T2In period, liquid crystal capacitance voltage V1、V2Absolute value all continue to reduce.Therefore eye-observation to the luminance difference that moment glimmers is: automatically update the brightness of picture more than the brightness extending picture.Especially for the vision of human eye, luminance difference during low-light level is easier to be discovered by people.It addition, in figure 3, VCOMIt is common electric voltage, VDIt is drain voltage, VSIt is source voltage (the electric crystal source electrode of panel connects liquid crystal capacitance), VGIt it is grid voltage.
Summary of the invention
The embodiment of the present invention provides a kind of method that panel improving display floater automatically updates film flicker, comprise the steps of when display floater by panel automatically update pattern enter normal mode time, produce to extend picture (frame) so that with outside, the Display panel signal of display floater shows that signal is Tong Bu；Automatically updated last picture generation one delay picture of pattern according to panel before producing to extend picture；Within the display time postponing picture, the brightness of computing relay picture according to the driving voltage of display floater and the time of delay picture；Extend the brightness of picture according to the brightness adjustment postponing picture, make the brightness of prolongation picture identical with the brightness postponing picture.
The embodiment of the present invention provides a kind of control circuit, film flicker problem is automatically updated in order to what improve a display floater, described control circuit receives outside display signal to produce Display panel signal, when display floater by panel automatically update pattern enter normal mode time, producing to extend picture (frame) so that Display panel signal is Tong Bu with outside display signal, control circuit includes memorizer and processing unit.Memory storage is entered last picture of normal mode when panel automatically updates pattern when panel by normal mode.Last picture that processing unit automatically updated pattern according to panel before producing to extend picture produces a delay picture, and within the display time postponing picture, the brightness of computing relay picture according to the driving voltage of display floater and the time of delay picture, and according to the brightness of the brightness adjustment prolongation picture postponing picture, make the brightness of prolongation picture identical with the brightness postponing picture.
In sum, the embodiment of the present invention provides a kind of panel improving display floater to automatically update method and the control circuit thereof of film flicker, when display floater by panel automatically update pattern enter normal mode time, produce to postpone picture, and the brightness of computing relay picture, and adjusting the brightness extending picture accordingly, the brightness making prolongation picture is identical with the brightness of other pictures.Thereby, the problem that panel automatically updates film flicker is improved.
Accompanying drawing explanation
Fig. 1 is the schematic diagram controlling framework of traditional liquid crystal display；
Fig. 2 is traditional panel of LCD to be entered panel by normal mode and automatically updates pattern and return the signal waveforms of normal mode；
Fig. 3 is the oscillogram of the voltage of the liquid crystal capacitance of traditional panel of LCD；
Fig. 4 is the flow chart that the panel improving display floater that the embodiment of the present invention provides automatically updates the method for film flicker；
Fig. 5 is that the panel of LCD that the embodiment of the present invention provides is entered panel by normal mode and automatically updates pattern and return the signal waveforms of normal mode；
Fig. 6 is that the panel of LCD that the embodiment of the present invention provides is entered panel by normal mode and automatically updates pattern and return the signal waveforms of normal mode；
Fig. 7 is the oscillogram of the voltage of the liquid crystal capacitance of the panel of LCD that the embodiment of the present invention provides；
Fig. 8 is that the panel of LCD that another embodiment of the present invention provides is entered panel by normal mode and automatically updates the schematic diagram that pattern returns the driving voltage of normal mode.
Wherein, accompanying drawing labelling:
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 display signal
OE: output 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: hide from view period
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
Detailed description of the invention
(improving the embodiment that the panel of display floater automatically updates the method for film flicker)
Refer to Fig. 4, Fig. 4 be the embodiment of the present invention provide improve the flow chart that panel automatically updates the method for film flicker.Because by automatically update pattern (PSRMode) return to normal mode (Normalmode) time, human eye can experience the difference of picture brightness, the present embodiment provides a kind of and improves the method that panel automatically updates film flicker, for a display floater, when display floater by panel automatically update pattern enter normal mode time, produce to extend picture (extendingframe, (1+ α) frame) so that the Display panel signal of display floater is Tong Bu with outside display signal.And carry out following step.First, in step S410, before producing to extend picture, automatically update last picture generation delay picture of pattern according to panel.The flow process of the present embodiment can be divided into two benches to reach, first stage is step S410, as shown in the oscillogram of Fig. 5, one picture of time delay of normal mode will be entered, time schedule controller (T-CON) is made to have time enough to do the correction of second stage, the method producing to postpone picture is as follows: when panel is entered normal mode by the pattern of automatically updating, outside display signal Input_DE exports signal again, when time schedule controller (T-CON) receives outside display signal Input_DE, prolong later picture and enter normal mode.Namely with reference to the sequential automatically updating pattern, one, many works produce after postponing picture to extend picture again.As it is shown in figure 5, compared to traditional synchronizing signal Old_STV, the synchronizing signal New_STV of the present embodiment can be seen that, postpone picture extending previously inserted one of picture.
Then, step S420 is carried out.In the step s 420, within the display time postponing picture, the brightness of computing relay picture according to the driving voltage of panel and the time of delay picture.At the present embodiment, the brightness postponing picture is utilize following formula to calculate with the brightness extending picture:
Wherein, V is liquid crystal capacitance voltage, and T is the time of picture.
Then, step S430 is carried out.In step S430, extend the brightness of picture according to the brightness adjustment postponing picture, make the brightness of prolongation picture identical with the brightness postponing picture.Specifically, can learn according to above narration, automatically update the brightness of picture more than the brightness extending picture be due to,
Therefore have two methods can revise the brightness extending picture.First method: need grid high potential VGHTime increase, with avoid extend picture liquid crystal capacitance voltage V2Reduce too many and cause the brightness extending picture few.Second method: the driving voltage directly promoting panel of LCD (is generally the drain voltage V of panel transistorD), and make liquid crystal capacitance voltage (the usually source voltage V of panel transistorS) promote, thereby increase the brightness extending picture.
About above-mentioned first method, step S430 can include, and increases in the gate turn-on time of the panel extending picture according to the brightness postponing picture, so that the brightness extending picture is identical with the brightness postponing picture.Referring to Fig. 1, Fig. 5 and Fig. 6, when time schedule controller 12 receives outside display signal Input_DE, except making one more and postponing picture, during extending picture, shorten the width of output enable signal OE (High), make width W1 > W2, width W2 along with extend picture time and (namely along with the α time adjusts, or be called along with the 1+ α time adjusts), to increase the brightness extending picture, the brightness making prolongation picture is identical with the brightness of previous picture (delay picture).It is to say, adjust along with the time extending picture in the gate turn-on time of the display floater extending picture, to increase the brightness extending picture.Specifically, the signal GCK in Fig. 6 is in order to compare with output enable signal OE, and obtains gate-on signal VG.As it is shown in fig. 7, as gate-on signal VGWhen making the gate turn-on time increase, then it is increased during extending the liquid crystal charging of picture, so makes liquid crystal capacitance voltage V2Then keep and V1Identical.Thereby,
Then postpone picture (delayframe) equal to extending picture ((1+ α) frame).
About above-mentioned second method, step S430 can include, and increases driving voltage (the usually drain voltage V of panel transistor at the panel extending picture according to the brightness postponing pictureD), so that the brightness extending picture is identical with the brightness postponing picture.When practical application, with reference to Fig. 8, set up overvoltage and drive look-up table (OverDrivingLookup-table), it is assumed that former write driver voltage is VABecause of in the period automatically updating pattern, the picture buffer (Framebuffer) of display end has had picture, when postponing picture, time schedule controller (T-CON) is tabled look-up with reference to α value, and when extending picture, outputting drive voltage signal OD writes the driving voltage V of liquid crystal display drive circuitB, as shown in Figure 8, extend the driving voltage (V of pictureB) more than the driving voltage (V postponing pictureA).Therefore liquid crystal capacitance stores then relatively multi-charge, and the brightness extending picture after write can be made identical with the brightness of previous delay picture and other picture.Briefly, overvoltage can be set up and drive look-up table (OverDrivingLookup-table), according to the driving voltage (V postponing pictureA) drive look-up table with overvoltage, it is thus achieved that extend the driving voltage (V of the panel of pictureB).It is worth mentioning that, described look-up table can such as be stored in the built-in memorizer of the digital signal processor 122 of Fig. 1 or such as be stored in the electronics formula of erasing of this digital signal processor 122 external and can make carbon copies read only memory (EEPROM), but the present invention is also not so limited, the memorizer kind storing look-up table can change according to being actually needed with arranging position.
(improving the embodiment that the panel of display floater automatically updates the control circuit of film flicker)
Referring to Fig. 1, Fig. 4 and Fig. 5, explanation according to previous embodiment, the present embodiment provides a kind of control circuit, panel in order to improve a display floater automatically updates film flicker, described control circuit receives outside display signal Input_DE to produce Display panel signal Tx_DE, when display floater by panel automatically update pattern enter normal mode time, produce to extend picture (frame) so that with outside, Display panel signal Tx_DE shows that signal Input_DE is Tong Bu.Described control circuit such as includes memorizer (picture buffer 123 such as Fig. 1) and processing unit (digital signal processor 122 as shown in Figure 1).Memory storage is entered last picture of normal mode when panel automatically updates pattern when display floater by normal mode.Last picture that digital signal processor 122 automatically updated pattern according to panel before producing to extend picture produces a delay picture, and within the display time postponing picture, the brightness of computing relay picture according to the driving voltage of display floater and the time of delay picture, and according to the brightness of the brightness adjustment prolongation picture postponing picture, make the brightness of prolongation picture identical with the brightness postponing picture.About the brightness how calculating picture, and how to extend the brightness of picture according to the brightness adjustment postponing picture, refer to the explanation of previous embodiment, repeat no more.
(possible effect of embodiment)
In sum, the panel of what the embodiment of the present invention provided improve display floater automatically updates method and the control circuit thereof of film flicker, when display floater by panel automatically update pattern enter normal mode time, produce to postpone picture, and the brightness of computing relay picture, and utilizing the gate turn-on time changing display floater or driving voltage to increase the liquid crystal capacitance charging of prolongation picture accordingly, the brightness making prolongation picture is identical with the brightness of other picture.Thereby, the problem that panel automatically updates film flicker is improved.
Claims (11)
1. the method that the panel improving display floater automatically updates film flicker, it is characterised in that comprise the following steps:
When this display floater by a panel automatically update pattern enter a normal mode time, produce a prolongation picture so that the display signal synchronization outside with of a Display panel signal of this display floater；
Automatically updated last picture generation one delay picture of pattern according to this panel before producing this prolongation picture；
Within the display time of this delay picture, calculate the brightness of this delay picture according to the driving voltage of this display floater and the time of this delay picture；And
According to the brightness of this prolongation picture of brightness adjustment of this delay picture, the brightness making this prolongation picture is identical with the brightness of this delay picture.
2. according to claim 1 improving the method that the panel of display floater automatically updates film flicker, it is characterised in that the brightness of the brightness of this delay picture and this prolongation picture is to utilize following formula to calculate:
Wherein, V is liquid crystal capacitance voltage, and T is the time of picture.
3. according to claim 1 improving the method that the panel of display floater automatically updates film flicker, it is characterised in that include according to the step of the brightness of this prolongation picture of brightness adjustment of this delay picture:
The gate turn-on time of this display floater at this prolongation picture is increased, so that the brightness of this prolongation picture is identical with the brightness of this delay picture according to the brightness of this delay picture.
4. according to claim 3 improving the method that the panel of display floater automatically updates film flicker, it is characterised in that adjust along with the time of this prolongation picture in the gate turn-on time of this display floater of this prolongation picture, to increase the brightness extending picture.
5. according to claim 1 improving the method that the panel of display floater automatically updates film flicker, it is characterised in that include according to the step of the brightness of this prolongation picture of brightness adjustment of this delay picture:
The driving voltage of this display floater at this prolongation picture is increased, so that the brightness of this prolongation picture is identical with the brightness of this delay picture according to the brightness of this delay picture.
6. according to claim 5 improving the method that the panel of display floater automatically updates film flicker, it is characterised in that more include:
Set up an overvoltage and drive look-up table, drive look-up table according to the driving voltage of this delay picture with this overvoltage, it is thus achieved that the driving voltage of this display floater of this prolongation picture.
7. according to claim 1 improving the method that the panel of display floater automatically updates film flicker, it is characterized in that, when this display floater by this normal mode enter this panel automatically update pattern time, last picture of this normal mode is deposited in a memorizer, and automatically update in pattern at this display floater, show last picture of this normal mode.
8. a control circuit, film flicker problem is automatically updated in order to what improve a display floater, this control circuit receives an outside display signal to produce a Display panel signal, when this display floater by a panel automatically update pattern enter a normal mode time, produce a prolongation picture so that with this outside, this Display panel signal shows that signal is Tong Bu, it is characterized in that, this control circuit includes:
One memorizer, stores when this display floater is entered last picture of this normal mode when this panel automatically updates pattern by this normal mode；And
One processing unit, automatically updated last picture generation one delay picture of pattern according to this panel before producing this prolongation picture, and within the display time of this delay picture, the brightness of this delay picture is calculated according to the driving voltage of this display floater and the time of this delay picture, and the brightness of this prolongation picture of brightness adjustment according to this delay picture, the brightness making this prolongation picture is identical with the brightness of this delay picture.
9. according to asking claim 8 control circuit, it is characterised in that more include:
One drive circuit, is controlled by this processing unit, to control driving voltage and the gate turn-on time of this display floater.
10. according to asking claim 8 control circuit, it is characterised in that this processing unit increases the gate turn-on time of this display floater at this prolongation picture according to the brightness of this delay picture.
11. according to asking claim 8 control circuit, it is characterised in that this processing unit increases the driving voltage of this display floater at this prolongation picture according to the brightness of this delay picture.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
| TW103132086 | 2014-09-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105719604A true CN105719604A (en) | 2016-06-29 |
| CN105719604B CN105719604B (en) | 2017-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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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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| CN (1) | CN105719604B (en) |
| TW (1) | TW201612883A (en) |
Cited By (2)
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| CN106371959A (en) * | 2016-08-30 | 2017-02-01 | 硅谷数模半导体（北京）有限公司 | Display test method and device |
| CN110751931A (en) * | 2018-01-22 | 2020-02-04 | 青岛海信移动通信技术股份有限公司 | Page refreshing method and device for ink screen |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| Publication number | Publication date |
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| TW201612883A (en) | 2016-04-01 |
| CN105719604B (en) | 2017-12-12 |
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