CN202443724U - Display panel and scanning drive circuit thereof - Google Patents
Display panel and scanning drive circuit thereof Download PDFInfo
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- CN202443724U CN202443724U CN2012200456720U CN201220045672U CN202443724U CN 202443724 U CN202443724 U CN 202443724U CN 2012200456720 U CN2012200456720 U CN 2012200456720U CN 201220045672 U CN201220045672 U CN 201220045672U CN 202443724 U CN202443724 U CN 202443724U
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Abstract
The utility model provides a display panel and a scanning drive circuit thereof, which relate to the technical field of display. The scanning drive circuit comprises a scanning driver, wherein the scanning driver comprises a plurality of output passages, and the output passages are respectively connected with a plurality of scanning lines one by one; a reversed-phase unit is arranged between the output passages and the corresponding scanning lines; and a first level signal output by the output passages is transmitted to the corresponding scanning lines after the first level signal is converted into a second level signal by the reversed-phase unit, or a second level signal output by the output passages is transmitted to the corresponding scanning lines after the second level signal is converted into the first level signal by the reversed-phase unit. According to the display panel and the scanning drive circuit thereof, the problem that a scanning signal output by the scanning driver is not matched with a switching component in the display panel can be solved.
Description
Technical field
The utility model relates to the display technique field, is specifically related to a kind of display panel and scan drive circuit thereof.
Background technology
Except display panels; Industry is at the novel FPD or the flexible organic light emitting display (OLED that shows of research and development at present; Organic Light-Emitting Display) panel, polymer LED (PLED; Polymer Light-Emitting Diode) display panel, OTFT (OTFT, Organic Thin-Film Transistor) display panel and Electronic Paper (e-Paper) display panel etc.The equipment that includes these novel display panels respectively has its advantage, for example low-power consumption, can be around folding, colour gamut is wide and the visual angle is wide or the like.Usually; These display devices that are in the research and development have still adopted book film transistor LCD (TFT-LCD; Thin Film Transistor Liquid Crystal Display) the matrix form pel array design of being adopted; Each display unit all has color and gray scale alone, can realize than the better display effect of TFT-LCD display.
Above-mentioned display device still adopts the actuating switch of semiconductor switch device as the data-signal of sub-pixel unit usually, and whether semiconductor switch device can import said sub-pixel unit in order to the determination data signal.The scanner driver (scanning chip) that existing TFT-LCD uses has all been realized universalization, can on different panels, use with a chip.The chip universalization makes can develop the new chip model as few as possible, has saved the die sinking expense greatly.Improve tempo of development in order to practice thrift cost of development, often hope to adopt existing universal scan driver.But; Because the output of the scanner driver (promptly scanning chip) of conventional TFT-LCD in the prior art; Possibly and not match with the switching device that adopted on the display panel newly developed, thereby cause scanner driver of the prior art possibly can't directly apply to display panel newly developed.
For example, be example with a kind of existing display panel, the right side is depicted as its equivalent electrical circuit 30 synoptic diagram among Fig. 1, and the left side is the waveform of the sweep signal exported of the scanner driver that is complementary with it.What existing display panel adopted usually is the N-type semiconductor switching device; What scanner driver was exported is the sweep signal that is complementary with the N-type semiconductor switching device; Promptly only scanning certain row sub-pixel unit 31; The sweep signal of scanner driver output is just with the switching device conducting of this row, so that data-signal can input to the sub-pixel unit of this row.
Yet, when display panel newly developed, might use P type switching device.In order to reduce the development and Design cost and to accelerate tempo of development, to hope again this moment to use scanner driver general in the prior art, therefore the output and the unmatched problem of switching device of scanner driver possibly appear.For example, among Fig. 1, if the employing of the sub-pixel unit of TFT display panel is P type switching device, the sweep signal of then existing turntable driving device output then can't directly be used.
The utility model content
In view of this, the purpose of the utility model provides a kind of display panel and scan drive circuit thereof, solves the sweep signal and the unmatched problem of the switching device in the display panel of scanner driver output.
For solving the problems of the technologies described above, the utility model provides scheme following:
A kind of scan drive circuit of display panel, said display panel comprises the multi-strip scanning line; Said scan drive circuit comprises:
Scanner driver, said scanner driver comprises a plurality of output channels, said a plurality of output channels link to each other with said multi-strip scanning line respectively one by one;
Between said output channel and corresponding scanning line, be provided with a rp unit;
Wherein, First level signal of output channel output is sent to corresponding scanning line after being converted into second level signal by said rp unit; Perhaps, second level signal of output channel output is sent to corresponding scanning line after being converted into first level signal by said rp unit.
Preferably, in the above-mentioned scan drive circuit, said display panel can also comprise a plurality of sub-pixel unit, and said sub-pixel unit includes switching device, and said switching device is connected with corresponding scanning line.
Preferably, in the above-mentioned scan drive circuit,
Said switching device can be P type thin film transistor (TFT);
Said first level signal is the Continuity signal that makes the conducting of N type thin film transistor (TFT), and said second level signal is the pick-off signal that N type thin film transistor (TFT) is ended.
Preferably, in the above-mentioned scan drive circuit,
Said switching device can be N type thin film transistor (TFT);
Said first level signal is the Continuity signal that makes the conducting of P type thin film transistor (TFT), and said second level signal is the pick-off signal that P type thin film transistor (TFT) is ended.
Preferably, in the above-mentioned scan drive circuit, said rp unit can comprise:
PMOS pipe and NMOS pipe, wherein:
The grid of said PMOS pipe links to each other with the grid of said NMOS pipe and forms the input end of said rp unit, and said input end is connected with corresponding output channel;
The drain electrode of said PMOS pipe links to each other with the drain electrode of said NMOS pipe and forms the output terminal of said rp unit, and said output terminal is connected with corresponding scanning line;
The source electrode of said PMOS pipe is connected to first level, and the source electrode of said NMOS pipe is connected to second level.
The utility model also provides a kind of display panel, comprises the multi-strip scanning line; Said display panel also comprises:
Scanner driver, said scanner driver comprises a plurality of output channels, said a plurality of output channels link to each other with said multi-strip scanning line respectively one by one;
Between said output channel and corresponding scanning line, be provided with a rp unit;
Wherein, First level signal of output channel output is sent to corresponding scanning line after being converted into second level signal by said rp unit; Perhaps, second level signal of output channel output is sent to corresponding scanning line after being converted into first level signal by said rp unit.
Preferably, above-mentioned display panel can also comprise:
A plurality of sub-pixel unit, said sub-pixel unit includes switching device, and said switching device is connected with corresponding scanning line.
Preferably, above-mentioned display panel can also comprise:
When said switching device was P type thin film transistor (TFT), said first level signal was the Continuity signal that makes the conducting of N type thin film transistor (TFT), and said second level signal is the pick-off signal that N type thin film transistor (TFT) is ended;
When said semiconductor switch device was N type thin film transistor (TFT), said first level signal was the Continuity signal that makes the conducting of P type thin film transistor (TFT), and said second level signal is the pick-off signal that P type thin film transistor (TFT) is ended.
Preferably, in the above-mentioned display panel, said rp unit can comprise:
PMOS pipe and NMOS pipe, wherein:
The grid of said PMOS pipe links to each other with the grid of said NMOS pipe and forms the input end of said rp unit, and said input end is connected with corresponding output channel;
The drain electrode of said PMOS pipe links to each other with the drain electrode of said NMOS pipe and forms the output terminal of said rp unit, and said output terminal is connected with corresponding scanning line;
The source electrode of said PMOS pipe is connected to first level, and the source electrode of said NMOS pipe is connected to second level.
Preferably, above-mentioned display panel can be display panels, organic electroluminescence display panel, polymer LED display panel, OTFT display panel or Electronic Paper display panel.
Can find out from the above; Display panel that the utility model provides and scan drive circuit thereof; Through in the output channel of scanner driver, increasing a rp unit, the output waveform of scanner driver is carried out the anti-phase conversion, make it go for dissimilar switching devices; Thereby enlarged the usable range of scanner driver, and can reduce the cost of development of novel display panel and accelerate tempo of development.
Description of drawings
Fig. 1 is the schematic equivalent circuit of a kind of display panel of prior art;
Fig. 2 is the signal output waveform figure of a kind of display panel scanner driver of the prior art;
Fig. 3 is a needed waveform synoptic diagram when adopting P type switching device;
The structural representation of a kind of rp unit that Fig. 4 provides for the utility model embodiment;
The structural representation of a kind of display panel that Fig. 5 provides for the utility model embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing and specific embodiment that the utility model is described in detail below.
Existing display panel shown in Figure 1 uses the N-type semiconductor switching device usually in sub-pixel unit.When if display panel newly developed uses the P-type semiconductor switching device in sub-pixel unit, the sweep signal of scanner driver output and the unmatched problem of job requirement of P-type semiconductor switching device then possibly appear.
For example, please with reference to Fig. 2, show the signal output waveform figure (the switching device here is the N-type semiconductor switching device normally) of a kind of common display panel scanner driver of the prior art.This oscillogram is to be clock with CLK, and each clock period all is connected to the last switching device of a certain horizontal scanning line (G1～G5 etc.) and is opened, and at this moment the data on the data line are updated on the sub-pixel unit of corresponding row, realize the renewal of data line.Here, the voltage that switching device is opened is called VGH, and the voltage of closing is VGL.Voltage when Gn is high among the figure is VGH, and the voltage when Gn is low is VGL.Can find out; Any moment all is that to have only the voltage on the horizontal scanning line be VGH, and the voltage on other horizontal scanning lines is VGL, to guarantee the having only switching device on the horizontal scanning line to be opened on the whole display panel; And then realize with time being order, line by line scan to an every trade.
And when adopting the P-type semiconductor switching device, working condition is just the opposite, and the waveform of its requirement is as shown in Figure 3.P-type semiconductor switching device conducting when sweep trace voltage is VGL, the P-type semiconductor switching device turn-offed when voltage was VGH.If directly use above-mentioned scanning chip drives such situation will occur.Be all to have only the P-type semiconductor switching device on the horizontal scanning line to be turned off in arbitrary moment, all conductings of P-type semiconductor switching device on other row, so the information on the data line will receive by other row simultaneously, thus cause showing mistake.
The utility model embodiment is through increasing a rp unit in the output channel of scanner driver; The output waveform of the scanner driver of TFT-LCD is changed; Make its requirement that goes for dissimilar semiconductor switch devices, thereby solved the problems referred to above well, when making the dissimilar semiconductor switch device of in display panel employing; Can directly use the scanner driver of the ripe TFT-LCD of industry, reduce cost of development and accelerated tempo of development.
The utility model embodiment provides a kind of scan drive circuit that is used for providing to display panel sweep signal.Here, said display panel can comprise multi-strip scanning line and a plurality of sub-pixel unit, and said sub-pixel unit includes switching device, and said switching device is connected with corresponding scanning line.When said switching device conducting, data-signal will input to said sub-pixel unit.The scan drive circuit that present embodiment provides specifically can comprise:
Scanner driver, said scanner driver comprises a plurality of output channels, said a plurality of output channels link to each other with said multi-strip scanning line respectively one by one;
Between said output channel and corresponding scanning line, be provided with a rp unit;
Wherein, First level signal of output channel output is sent to corresponding scanning line after being converted into second level signal by said rp unit; Perhaps, second level signal of output channel output is sent to corresponding scanning line after being converted into first level signal by said rp unit.Here first level signal is the signal of first level, and second level signal is the signal of second level.
Can find out from foregoing circuit; Present embodiment has increased rp unit; The output channel of the input termination scanner driver of this rp unit, output termination corresponding scanning line, and the sweep signal (comprising first level signal, second level signal) of scanner driver output is carried out anti-phase handle; Thereby can be when sweep signal and switching device match, the adjustment sweep signal makes it to be complementary with the work characteristics of switching device.Can find out; Present embodiment have circuit simple, realize the low advantage of cost, like this, when improving at the development of new display panel or to existing display panel; If adopted the semiconductor switch device different (like the P type) with the prior art general type; Through using the scan drive circuit of present embodiment, just can still use scanner driver general in the prior art so, thereby can avoid the cost of development of new scanner driver generation and accelerate tempo of development.
Here, switching device can be to adopt the conventional semiconductor switching device.For example; If the semiconductor switch device that adopts in the sub-pixel unit is a P type thin film transistor (TFT); So said first level signal can be the Continuity signal that makes the conducting of N type thin film transistor (TFT), and said second level signal can be the pick-off signal that N type thin film transistor (TFT) is ended.Concrete first level and second level can be with reference to the cut-in voltage and the cut-off voltages of P type thin film transistor (TFT).
Again for example; If the semiconductor switch device that adopts in the sub-pixel unit is a N type thin film transistor (TFT); So said first level signal can be the Continuity signal that makes the conducting of P type thin film transistor (TFT), and said second level signal can be the pick-off signal that P type thin film transistor (TFT) is ended.
The function of rp unit is the mutual conversion that realizes between first level signal and second level signal, and it specifically can be realized through at least one phase inverter.For example rp unit can comprise a phase inverter, and can realize the mutual conversion of level signal this moment; Rp unit can also comprise three phase inverters connected in series, mutual conversion that also can level signal.A kind of preferred implementation below is provided, and please with reference to Fig. 4, the structure of a kind of rp unit that present embodiment provides only comprises a phase inverter, and it specifically comprises:
PMOS pipe 21 and NMOS pipe 22, wherein:
The grid of said PMOS pipe 21 and the input end 23 that the grid of said NMOS pipe 22 links to each other and forms said rp unit are connected with corresponding output channel;
The drain electrode of said PMOS pipe 21 and the output terminal 24 that the drain electrode of said NMOS pipe 22 links to each other and forms said rp unit are connected with corresponding scanning line;
The source electrode of said PMOS pipe 21 is connected to first level, and the source electrode of said NMOS pipe 22 is connected to second level.
Here, the source electrode of said PMOS pipe 21 is connected to first level, specifically can be that the source electrode with said PMOS pipe 21 is connected to power end 25.The source electrode of said NMOS pipe 22 is connected to second level, specifically can be the source ground 26 with said NMOS pipe 22.
Circuit shown in Figure 4 can be opened two metal-oxide-semiconductors up and down respectively according to the height of incoming level, can export waveform as shown in Figure 3, can satisfy P-type semiconductor switching device requirements of one's work.
Below combine Fig. 5 again, the display panel that the utility model embodiment is provided is further described.The utility model one embodiment provide a kind of display panel, and this display panel specifically can be display panels, organic electroluminescence display panel, polymer LED display panel, OTFT display panel or Electronic Paper display panel.Please with reference to Fig. 5, this display panel comprises:
The time schedule controller 12 and one of array base palte 14, scanner driver 13, source electrode driver 11, this scanner driver 13 of control and source electrode driver 11 provides the common electric voltage circuit 15 of common electric voltage.Array base palte 14 is provided with the public pressure wire 145 of sweep trace 143 and and the spaced set parallel with sweep trace 143 of many parallel spaced sets; Many and sweep trace 143 vertically disposed data lines 141, and a plurality of sub-pixel unit 142 that defines by sweep trace 143 and data line 141 intersections.This sub-pixel unit 142 comprises a switching device 1421, one pixel electrodes and a public electrode (switching device 1421 only is shown among the figure).Concrete, said switching device 1421 can be a thin film transistor (TFT), comprises a grid, one source pole and a drain electrode, is connected to sweep trace 143 respectively, data line 141 and pixel electrode.
When said display panel was display panels, pixel electrode, public electrode and the liquid crystal layer that is sandwiched in were between the two formed a liquid crystal capacitance C2; Pixel electrode, public pressure wire 145 and insulation course between the two constitute a MM CAP C1.
Here, for the TFT display panel, said sweep trace 143 is generally gate line, and said semiconductor switch device 1421 is generally thin film transistor (TFT) (TFT).
Among Fig. 5, said scanner driver 13 comprises a plurality of output channels 131, and said a plurality of output channels 131 link to each other with said multi-strip scanning line 143 respectively one by one.Here, said scanner driver 13 also can be called as gate drivers.
Present embodiment is provided with a rp unit 16 between said output channel 131 and corresponding scanning line 143.First level signal of output channel 131 outputs is sent to corresponding scanning line 143 after being converted into second level signal by said rp unit 16; Perhaps, second level signal of output channel 131 outputs is sent to corresponding scanning line 143 after being converted into first level signal by said rp unit 16.
Here, said switching device 1421 specifically can be a P type thin film transistor (TFT), and at this moment, said first signal is the Continuity signal that makes the conducting of N type thin film transistor (TFT), and said secondary signal is the pick-off signal that N type thin film transistor (TFT) is ended.Said semiconductor switch device 1421 all right N type thin film transistor (TFT)s, at this moment, said first signal is the Continuity signal that makes the conducting of P type thin film transistor (TFT), said secondary signal is the pick-off signal that P type thin film transistor (TFT) is ended.
Among Fig. 5, scanner driver 13 has several output channels 131.Under the situation of using the single scanning driver, the quantity of output channel 131 is identical with the line number of display panel 14 usually.Also the line number with display panel 14 is identical usually for the quantity of rp unit 16.That is to say that each output channel all is connected to a sweep trace 143 through a rp unit 16.A kind of concrete implementation of rp unit 16 can be with reference to the description in figure 4 and the preceding text, and its function that realizes is input signal to be carried out anti-phase handle back output.When making said display panel; Said rp unit 16 can be in the composition technology that forms said semiconductor switch device 1421, together to form; For example, when forming thin film transistor (TFT), form said rp unit 16 through several times composition technology; To simplify manufacturing process, save manufacturing cost.
Display panel shown in Figure 5; The scan drive circuit that has adopted present embodiment to provide; Can be so that scanner driver wherein adapts to dissimilar semiconductor switch devices; Thereby enlarged the usable range of scanner driver, and can reduce the cost of development of novel display panel and accelerate tempo of development.
Claims (10)
1. the scan drive circuit of a display panel, said display panel comprises the multi-strip scanning line; It is characterized in that said scan drive circuit comprises:
Scanner driver, said scanner driver comprises a plurality of output channels, said a plurality of output channels link to each other with said multi-strip scanning line respectively one by one;
Between said output channel and corresponding scanning line, be provided with a rp unit;
Wherein, First level signal of output channel output is sent to corresponding scanning line after being converted into second level signal by said rp unit; Perhaps, second level signal of output channel output is sent to corresponding scanning line after being converted into first level signal by said rp unit.
2. scan drive circuit as claimed in claim 1 is characterized in that,
Said display panel also comprises a plurality of sub-pixel unit, and said sub-pixel unit includes switching device, and said switching device is connected with corresponding scanning line.
3. scan drive circuit as claimed in claim 2 is characterized in that,
Said switching device is a P type thin film transistor (TFT);
Said first level signal is the Continuity signal that makes the conducting of N type thin film transistor (TFT), and said second level signal is the pick-off signal that N type thin film transistor (TFT) is ended.
4. scan drive circuit as claimed in claim 2 is characterized in that,
Said switching device is a N type thin film transistor (TFT);
Said first level signal is the Continuity signal that makes the conducting of P type thin film transistor (TFT), and said second level signal is the pick-off signal that P type thin film transistor (TFT) is ended.
5. like claim 3 or 4 described scan drive circuits, it is characterized in that said rp unit comprises:
PMOS pipe and NMOS pipe, wherein:
The grid of said PMOS pipe links to each other with the grid of said NMOS pipe and forms the input end of said rp unit, and said input end is connected with corresponding output channel;
The drain electrode of said PMOS pipe links to each other with the drain electrode of said NMOS pipe and forms the output terminal of said rp unit, and said output terminal is connected with corresponding scanning line;
The source electrode of said PMOS pipe is connected to first level, and the source electrode of said NMOS pipe is connected to second level.
6. a display panel comprises the multi-strip scanning line; It is characterized in that said display panel also comprises:
Scanner driver, said scanner driver comprises a plurality of output channels, said a plurality of output channels link to each other with said multi-strip scanning line respectively one by one;
Between said output channel and corresponding scanning line, be provided with a rp unit;
Wherein, First level signal of output channel output is sent to corresponding scanning line after being converted into second level signal by said rp unit; Perhaps, second level signal of output channel output is sent to corresponding scanning line after being converted into first level signal by said rp unit.
7. display panel as claimed in claim 6 is characterized in that, also comprises:
A plurality of sub-pixel unit, said sub-pixel unit includes switching device, and said switching device is connected with corresponding scanning line.
8. display panel as claimed in claim 7 is characterized in that, also comprises:
When said switching device was P type thin film transistor (TFT), said first level signal was the Continuity signal that makes the conducting of N type thin film transistor (TFT), and said second level signal is the pick-off signal that N type thin film transistor (TFT) is ended;
When said semiconductor switch device was N type thin film transistor (TFT), said first level signal was the Continuity signal that makes the conducting of P type thin film transistor (TFT), and said second level signal is the pick-off signal that P type thin film transistor (TFT) is ended.
9. display panel as claimed in claim 8 is characterized in that, said rp unit comprises:
PMOS pipe and NMOS pipe, wherein:
The grid of said PMOS pipe links to each other with the grid of said NMOS pipe and forms the input end of said rp unit, and said input end is connected with corresponding output channel;
The drain electrode of said PMOS pipe links to each other with the drain electrode of said NMOS pipe and forms the output terminal of said rp unit, and said output terminal is connected with corresponding scanning line;
The source electrode of said PMOS pipe is connected to first level, and the source electrode of said NMOS pipe is connected to second level.
10. display panel as claimed in claim 6 is characterized in that, said display panel is display panels, organic electroluminescence display panel, polymer LED display panel, OTFT display panel or Electronic Paper display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200456720U CN202443724U (en) | 2012-02-13 | 2012-02-13 | Display panel and scanning drive circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012200456720U CN202443724U (en) | 2012-02-13 | 2012-02-13 | Display panel and scanning drive circuit thereof |
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| CN202443724U true CN202443724U (en) | 2012-09-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019184358A1 (en) * | 2018-03-30 | 2019-10-03 | 京东方科技集团股份有限公司 | Gate driving circuit, display device, and driving method |
| CN117316114A (en) * | 2023-11-08 | 2023-12-29 | 惠科股份有限公司 | Display panel and display device |
-
2012
- 2012-02-13 CN CN2012200456720U patent/CN202443724U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019184358A1 (en) * | 2018-03-30 | 2019-10-03 | 京东方科技集团股份有限公司 | Gate driving circuit, display device, and driving method |
| CN117316114A (en) * | 2023-11-08 | 2023-12-29 | 惠科股份有限公司 | Display panel and display device |
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