CN102024402B - Electrophoretic display and drive method thereof - Google Patents
Electrophoretic display and drive method thereof Download PDFInfo
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- CN102024402B CN102024402B CN 200910190433 CN200910190433A CN102024402B CN 102024402 B CN102024402 B CN 102024402B CN 200910190433 CN200910190433 CN 200910190433 CN 200910190433 A CN200910190433 A CN 200910190433A CN 102024402 B CN102024402 B CN 102024402B
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Abstract
The invention is applied in the technical field of display, and provides an electrophoretic display and a drive method thereof. The electrophoretic display comprises a display panel and a source driver coupled with the display panel, wherein the display panel comprises at least one pixel unit; the pixel unit is coupled with a pixel electrode and a common electrode; when a first drive voltage is to be provided for the pixel electrode with a second drive voltage, the source driver provides a first grounding voltage for the pixel electrode with the second drive voltage and then provides the first drive voltage for the pixel electrode with the second drive voltage; and the first grounding voltage is higher than the first drive voltage and lower than the second drive voltage. Therefore, risks in damages to a component can be reduced.
Description
Technical field
The invention belongs to the display technique field, relate in particular to a kind of electrophoresis type display and driving method thereof.
Background technology
The principle that electrophoresis type display (Electrophoretic Display) forms picture is to utilize charged particle to reflect external light source to come display frame.Therefore the characteristic of light, thin and deflection that electrophoresis type display has is subjected to gazing at of each tame manufacturer.
The source electrode driver of electrophoresis type display and gate pole driver couple a plurality of pixel cells.Pixel cell can couple pixel electrode and common electrode.In general, the type of drive of electrophoresis type display can be divided into type of drive and the direct drive mode of exchanging.Following elder generation is that example describes with the interchange type of drive of electrophoresis type display.
Fig. 1 is that a kind of that prior art provides exchanging under the type of drive voltage oscillogram of common electrode and pixel electrode.Please refer to Fig. 1, during F1 during the picture (for example being to write white picture) transfers picture to during F2 (for example being to write black picture), the voltage of pixel electrode can by positive voltage Vpos (for example being 15V) transfer to negative voltage Vneg (for example be-15V).
What deserves to be mentioned is that F1 during picture exists between common electrode and the pixel electrode and has pressure reduction Vneg-Vpos and (for example is-30V) electric capacity.When F1 transfers during the picture F2 to during the picture because the transient voltage of pixel electrode changes the influence with above-mentioned electric capacity, the voltage of common electrode may moment by voltage Vneg (15V) become voltage Vneg+ (Vneg-Vpos) (for example be-15V-30V=-45V).The voltage instantaneous of common electrode becomes-and 45V damaged pixel transistor easily not only, also damage source electrode driver and gate pole driver easily.
From the above, Fig. 2 is that a kind of that prior art provides exchanging under the type of drive oscillogram of the output voltage of gate pole driver.Fig. 3 is that a kind of that prior art provides exchanging under the type of drive oscillogram that the output voltage of source electrode driver changes.Can obviously be found out by Fig. 2 and Fig. 3, when the voltage instantaneous of common electrode become-during 45V, the output voltage of gate pole driver and source electrode driver also can be affected (shown in empty frame I1, I2).
Fig. 4 be prior art provide a kind of under the direct drive mode, the voltage oscillogram of common electrode and pixel electrode.The direct drive mode is with to exchange type of drive similar, and pixel electrode and common electrode transient voltage change and acutely also damage assembly easily, then repeat no more at this.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of electrophoresis type display, the electrophoresis type display that being intended to solve prior art provides is exchanging under type of drive and the direct drive mode, the voltage instantaneous of pixel electrode and common electrode changes violent, the problem of assemblies such as easy damaged pixel transistor.
The embodiment of the invention is achieved in that a kind of electrophoresis type display, and described electrophoresis type display comprises:
Display panel, it comprises at least one pixel cell, described pixel cell couples a pixel electrode and a common electrode;
Couple the source electrode driver of described display panel, when providing first driving voltage when having the described pixel electrode of second driving voltage, provide first ground voltage to the described pixel electrode with second driving voltage earlier, provide described first driving voltage to the described pixel electrode with second driving voltage again, described first ground voltage is between described first driving voltage and described second driving voltage; And
Couple the Voltage Supply Device of described common electrode, when providing the first common electrode voltage when having the described common electrode of the second common electrode voltage, provide second ground voltage to the described common electrode with second common electrode voltage earlier, provide the described first common electrode voltage to the described common electrode with second common electrode voltage again, described second ground voltage is between the described first common electrode voltage and the described second common electrode voltage;
When described Voltage Supply Device will provide the second common electrode voltage when having the described common electrode of the first common electrode voltage, provide second ground voltage to the described common electrode with first common electrode voltage earlier, provide the described second common electrode voltage to the described common electrode with first common electrode voltage again; And
Described Voltage Supply Device comprises:
The first transistor, its base terminal receives first control signal, and its first end couples one first voltage;
First resistance is coupled between the base terminal and one second voltage of described the first transistor;
Second resistance, its first end couples second end of described the first transistor;
The 3rd resistance, its first end and second end couple second end and the described first common electrode voltage of described second resistance respectively; And
Transistor seconds, its base terminal and first end couple described first end and second end of described the 3rd resistance respectively, and its second end couples an output terminal of described Voltage Supply Device.
Another purpose of the embodiment of the invention is to provide a kind of driving method of electrophoresis type display, said method comprising the steps of:
When providing first driving voltage when having a pixel electrode of second driving voltage, provide first ground voltage to the described pixel electrode with second driving voltage earlier, provide described first driving voltage to the described pixel electrode with second driving voltage again, described ground voltage is between described first driving voltage and second driving voltage.
In sum, the present invention is when providing first driving voltage when having the pixel electrode of second driving voltage, provide ground voltage between first and second driving voltage to pixel electrode earlier, provide first driving voltage to pixel electrode again, can reduce the risk that assembly damages thus.
Description of drawings
Fig. 1 is that a kind of that prior art provides exchanging under the type of drive voltage oscillogram of common electrode and pixel electrode;
Fig. 2 is that a kind of that prior art provides exchanging under the type of drive oscillogram of the output voltage of gate pole driver;
Fig. 3 is that a kind of that prior art provides exchanging under the type of drive oscillogram that the output voltage of source electrode driver changes;
Fig. 4 be prior art provide a kind of under the direct drive mode, the voltage oscillogram of common electrode and pixel electrode;
Fig. 5 is the synoptic diagram of the electrophoresis type display that provides of one embodiment of the invention;
Fig. 6 be one embodiment of the invention provide under the direct drive mode, the voltage oscillogram of common electrode and pixel electrode;
Fig. 7 is the synoptic diagram of the Voltage Supply Device that provides of another embodiment of the present invention;
Fig. 8 be another embodiment of the present invention provide exchanging under the type of drive voltage oscillogram of common electrode and pixel electrode;
Fig. 9 be another embodiment of the present invention provide exchanging under the type of drive oscillogram of the output voltage of gate pole driver;
Figure 10 be another embodiment of the present invention provide exchanging under the type of drive oscillogram that the output voltage of source electrode driver changes.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Pixel electrode of the prior art and common electrode transient voltage change violent, fragile assembly.In view of this, the embodiment of the invention is when providing first driving voltage when having the pixel electrode of second driving voltage, can provide ground voltage to pixel electrode earlier, provide first driving voltage to pixel electrode again, wherein ground voltage be between first driving voltage and second driving voltage.Ground voltage can be used as buffering thus, to reduce the risk that assembly damages.
In like manner, the embodiment of the invention is when providing the first common electrode voltage when having the common electrode of the second common electrode voltage, can provide ground voltage to common electrode earlier, provide the first common electrode voltage to pixel electrode again, wherein ground voltage be between the first common electrode voltage and the second common electrode voltage.Also reduce the risk that assembly damages thus.Below cooperate graphic being described in more detail.
Fig. 5 is the synoptic diagram of the electrophoresis type display that provides of one embodiment of the invention.Please refer to Fig. 5, electrophoresis type display 10 comprises display panel 20, source electrode driver 30 and gate pole driver 40.Display panel 20 comprises at least one pixel cell (be that example describe with 50).Pixel cell 50 couples pixel electrode PE and common electrode CE.Source electrode driver 30 couples the source electrode of pixel transistor 60 in the pixel cell 50.Gate pole driver 40 couples the gate of pixel transistor 60.
In the present embodiment, electrophoresis type display 10 is that example describes in the direct drive mode earlier.Fig. 6 be one embodiment of the invention provide under the direct drive mode, the voltage oscillogram of common electrode and pixel electrode.In the present embodiment, when source electrode driver 30 to provide driving voltage Vneg (for example be-15V) to have driving voltage Vpos (for example be+during 15V) pixel electrode PE (F5 during F3 transfers picture to during for example by picture), provide ground voltage to pixel electrode PE (F4 during the picture) earlier, provide driving voltage Vneg to pixel electrode PE (F5 during the picture) again.During F4 for example is a picture frame during the above-mentioned picture, but the present invention is not as limit.In other embodiments, during F4 also can be more than one picture frame during the picture.Because ground voltage is between driving voltage Vpos and Vneg, so ground voltage has the effect of buffering, can reduce the probability that assembly damages.
When source electrode driver 30 will provide the pixel electrode PE of driving voltage Vpos to having driving voltage Vneg (F7 during F5 transfers picture to during for example by picture), provide ground voltage to pixel electrode PE (F6 during the picture) earlier, provide driving voltage Vpos to pixel electrode PE (F7 during the picture) again.During F6 for example is a picture frame during the above-mentioned picture, but the present invention is not as limit.In other embodiments, during F6 also can be more than one picture frame during the picture.Also can reach similar effect thus.Follow-up type of drive does not repeat them here by that analogy.
What deserves to be mentioned is, though above-described embodiment has been depicted a possible kenel to electrophoresis type display and driving method thereof, usually know that the knowledgeable should know but have in the affiliated technical field, each manufacturer is all different for the design of electrophoresis type display and driving method thereof, and therefore application of the present invention is when being not restricted to the possible kenel of this kind.In other words, so long as when providing first driving voltage when having the pixel electrode of second driving voltage, providing ground voltage between first and second driving voltage to pixel electrode earlier, provide first driving voltage to pixel electrode again, has been to have met spiritual place of the present invention just.Below know that the knowledgeable can further understand spirit of the present invention for several embodiment usually so that this area has again, and implement the present invention.
In the above-described embodiments, electrophoresis type display 10 is that example describes in the direct drive mode, but the present invention is not as limit.For instance, electrophoresis type display 10 also can exchange way drive.Fig. 7 is the synoptic diagram of the Voltage Supply Device that provides of another embodiment of the present invention.In the present embodiment, electrophoresis type display 10 more comprises Voltage Supply Device 70.Voltage Supply Device 70 for example can comprise the first transistor 81, transistor seconds 82, the 3rd transistor 83 and the 4th transistor 84, first resistance 91, second resistance 92, the 3rd resistance 93, the 4th resistance 94, the 5th resistance 95, the 6th resistance 96 and the 7th resistance 97, with direct supply 101,102.The first transistor 81 and the 4th transistor 84 for example are the N-type bipolar junction transistors.Transistor seconds 82 and the 3rd transistor 83 for example are P type bipolar junction transistors. Direct supply 101 and 102 for example is the direct supply of 3V.
The output terminal out of Voltage Supply Device 70 couples common electrode CE, can provide common electrode voltage+VCOM ,-VCOM or ground voltage be to common electrode CE.Control signal CS1 and CS2 can be used to control the first transistor 81 and the 3rd transistor 83 respectively.When the first transistor 81 conductings, and then conducting of transistor seconds 82; Otherwise when the first transistor 81 ended, transistor seconds 82 can and then end.When 83 conductings of the 3rd transistor, the 4th and then conducting of transistor 84; Otherwise when the 3rd transistor 83 ended, the 4th transistor 84 can and then end.
Accept above-mentioned, when the first transistor 81 and transistor seconds 82 conductings and the 3rd transistor 83 and the 4th transistor 84 by the time, Voltage Supply Device 70 can provide common electrode voltage+VCOM to common electrode CE.When the 3rd transistor 83 and 84 conductings of the 4th transistor and the first transistor 81 and transistor seconds 82 by the time, Voltage Supply Device 70 can provide common electrode voltage-VCOM to common electrode CE.When the first transistor 81, transistor seconds 82, the 3rd transistor 83, the 4th transistor 84 by the time, Voltage Supply Device 70 can provide ground voltage to common electrode CE.
Fig. 8 be another embodiment of the present invention provide exchanging under the type of drive voltage oscillogram of common electrode and pixel electrode.In the present embodiment, when source electrode driver 30 provides driving voltage mode and above-described embodiment to pixel electrode PE similar, then repeat no more at this.What deserves to be mentioned is, when Voltage Supply Device 70 to provide common electrode voltage+VCOM (for example be+15V) to have driving voltage-VCOM (for example be-during 15V) common electrode CE (F5 during F3 transfers picture to during for example by picture), provide ground voltage to common electrode CE (F4 during the picture) earlier, provide common electrode voltage+VCOM to common electrode CE (F5 during the picture) again.Because ground voltage is between between common electrode voltage+VCOM and the-VCOM, so ground voltage has the effect of buffering, can reduce the probability of assembly damage.
When Voltage Supply Device 70 will provide the common electrode CE of common electrode voltage-VCOM to having driving voltage+VCOM (F7 during F5 transfers picture to during for example by picture), provide ground voltage to common electrode CE (F6 during the picture) earlier, provide common electrode voltage-VCOM to common electrode CE (F7 during the picture) again.Also can reach similar effect thus.Follow-up type of drive does not repeat them here by that analogy.
Fig. 9 be another embodiment of the present invention provide exchanging under the type of drive oscillogram of the output voltage of gate pole driver.Figure 10 be another embodiment of the present invention provide exchanging under the type of drive oscillogram that the output voltage of source electrode driver changes.Can obviously be found out by Fig. 9 and Figure 10, when the voltage of common electrode CE and pixel electrode PE significantly changes, utilize ground voltage can avoid gate pole driver 40 and the output voltage of source electrode driver 30 to be affected as buffering.
In sum, the present invention is when providing first driving voltage when having the pixel electrode of second driving voltage, provides ground voltage between first and second driving voltage to pixel electrode earlier, provides first driving voltage to pixel electrode again.Can reduce the risk that assembly damages thus.In addition, in an embodiment of the present invention, when providing the first common electrode voltage when having the common electrode of the second common electrode voltage, provide ground voltage between the first common electrode voltage and the second common electrode voltage to common electrode earlier, provide the first common electrode voltage to pixel electrode again.Also can reduce the risk that assembly damages thus.
Though the present invention discloses as above with embodiment; so it is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (4)
1. an electrophoresis type display is characterized in that, described electrophoresis type display comprises:
Display panel, it comprises at least one pixel cell, described pixel cell couples a pixel electrode and a common electrode;
Couple the source electrode driver of described display panel, when providing first driving voltage when having the described pixel electrode of second driving voltage, provide first ground voltage to the described pixel electrode with second driving voltage earlier, provide described first driving voltage to the described pixel electrode with second driving voltage again, described first ground voltage is between described first driving voltage and described second driving voltage; And
Couple the Voltage Supply Device of described common electrode, when providing the first common electrode voltage when having the described common electrode of the second common electrode voltage, provide second ground voltage to the described common electrode with second common electrode voltage earlier, provide the described first common electrode voltage to the described common electrode with second common electrode voltage again, described second ground voltage is between the described first common electrode voltage and the described second common electrode voltage;
When described Voltage Supply Device will provide the second common electrode voltage when having the described common electrode of the first common electrode voltage, provide second ground voltage to the described common electrode with first common electrode voltage earlier, provide the described second common electrode voltage to the described common electrode with first common electrode voltage again; And
Described Voltage Supply Device comprises:
The first transistor, its base terminal receives first control signal, and its first end couples one first voltage;
First resistance is coupled between the base terminal and one second voltage of described the first transistor;
Second resistance, its first end couples second end of described the first transistor;
The 3rd resistance, its first end and second end couple second end and the described first common electrode voltage of described second resistance respectively; And
Transistor seconds, its base terminal and first end couple described first end and second end of described the 3rd resistance respectively, and its second end couples an output terminal of described Voltage Supply Device.
2. electrophoresis type display as claimed in claim 1, it is characterized in that, when described source electrode driver will provide described second driving voltage when having the pixel electrode of described first driving voltage, provide described first ground voltage to the pixel electrode with described first driving voltage earlier, provide described second driving voltage to the pixel electrode with described first driving voltage again.
3. electrophoresis type display as claimed in claim 1 is characterized in that, described Voltage Supply Device also comprises:
The 4th resistance, it is coupled between the described output terminal of described second ground voltage and described Voltage Supply Device.
4. electrophoresis type display as claimed in claim 3 is characterized in that, described Voltage Supply Device also comprises:
The 3rd transistor, its base terminal receive one second control signal, and its first end couples a tertiary voltage;
The 5th resistance, it is coupled between the described the 3rd transistorized described base terminal and one the 4th voltage;
The 6th resistance, its first end couple the described the 3rd transistorized second end;
The 7th resistance, its first end and second end couple second end and the described second common electrode voltage of described the 6th resistance respectively; And
The 4th transistor, its base terminal and first end couple described first end and second end of described the 7th resistance respectively, and its second end couples the described output terminal of described Voltage Supply Device;
Described the first transistor and described the 4th transistor are the N-type bipolar junction transistor, and described transistor seconds and described the 3rd transistor are P type bipolar junction transistor.
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| CN 200910190433 CN102024402B (en) | 2009-09-16 | 2009-09-16 | Electrophoretic display and drive method thereof |
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| CN 200910190433 CN102024402B (en) | 2009-09-16 | 2009-09-16 | Electrophoretic display and drive method thereof |
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| CN102024402B true CN102024402B (en) | 2013-09-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101120393A (en) * | 2003-11-25 | 2008-02-06 | 伊英克公司 | Electro-optic displays, and methods for driving same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101120393A (en) * | 2003-11-25 | 2008-02-06 | 伊英克公司 | Electro-optic displays, and methods for driving same |
Non-Patent Citations (1)
| Title |
|---|
| 铃木雅臣.晶体管电路设计.《晶体管电路设计（下）2004年9月第一版》.科学出版社,2004,第152页、第154页. * |
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