CN102881256B - Pixel drive circuit, display panel, display device and pixel driving method - Google Patents
Pixel drive circuit, display panel, display device and pixel driving method Download PDFInfo
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- CN102881256B CN102881256B CN201210387899.8A CN201210387899A CN102881256B CN 102881256 B CN102881256 B CN 102881256B CN 201210387899 A CN201210387899 A CN 201210387899A CN 102881256 B CN102881256 B CN 102881256B
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Abstract
The invention provides a pixel drive circuit, a display panel, a display device and a pixel driving method and relates to the technical field of liquid crystal display, and the pixel drive circuit can reduce the power consumption of a data wire drive circuit. The pixel drive circuit comprises a plurality of pixel units distributed in a matrix, wherein the pixel units are connected with a data drive through data wires and are connected with a scanning drive through scanning wires, each pixel unit comprises a pixel electrode and a public electrode, and each pixel unit is connected with a first scanning wire and a second scanning wire; each pixel unit further comprises a voltage generating unit used for generating a primary voltage signal between the pixel electrode and the public electrode through a first voltage signal transmitted by the data wire under the control of the first scanning wire; and a voltage coupling unit used for boosting the primary voltage signal between the pixel electrode and the public electrode through a second voltage signal transmitted by the data wire under the control of the second scanning wire.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly relate to a kind of pixel-driving circuit, display panel, display device and image element driving method.
Background technology
At Thin Film Transistor (TFT) (Thin Film Transistor, TFT) in liquid crystal display, each liquid crystal pixel point is driven by the thin film transistor (TFT) be integrated in after pixel, data line signal in liquid crystal panel is transferred to pixel electrode by thin film transistor (TFT), and then the transmittance of the liquid crystal be positioned on pixel electrode is changed.
When pixel electrode needs higher driving voltage, the voltage of data line also needs corresponding increasing, now, the power consumption producing the data line drive circuit of data line signal will be multiplied, therefore, in current liquid crystal display, the power consumption of data line drive circuit is very large.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of pixel-driving circuit, display panel, display device and image element driving method, can reduce the power consumption of data drive circuit.
For solving the problems of the technologies described above, embodiments of the invention adopt following technical scheme:
A kind of pixel-driving circuit, comprise multiple pixel cell in matrix distribution, described pixel cell is connected with data driver by data line, is connected with scanner driver by sweep trace, and each pixel cell comprises pixel electrode, public electrode,
Each pixel cell connects the first sweep trace and the second sweep trace;
Each pixel cell also comprises:
Voltage generating unit, under the control of the first sweep trace, the first voltage signal transmitted by described data line generates the initial voltage signal between pixel electrode and public electrode;
Voltage couples unit, under the control of the second sweep trace, the second voltage signal transmitted by described data line is boosted to the initial voltage signal between pixel electrode and public electrode.
Described voltage generating unit comprises:
The first film transistor, the second thin film transistor (TFT), the first electric capacity;
The grid of described the first film transistor and the grid of described second thin film transistor (TFT), be all connected with described first sweep trace; The source electrode of described the first film transistor is connected with described data line; The drain electrode of described the first film transistor, is connected with the first end of described pixel electrode and described first electric capacity; Second end of described first electric capacity is connected with the source electrode of described second thin film transistor (TFT) and described voltage couples unit; The drain electrode of described second thin film transistor (TFT) is connected with described public electrode.
Described first electric capacity is the electric capacity that the overlapping part of the source electrode of described pixel electrode and described second thin film transistor (TFT) arranged by layering produces.
Described voltage couples unit comprises:
3rd thin film transistor (TFT) and the second electric capacity;
The grid of described 3rd thin film transistor (TFT) is connected with described second sweep trace; The source electrode of described 3rd thin film transistor (TFT) is connected with described data line; The drain electrode of described 3rd thin film transistor (TFT) is connected with the first end of described second electric capacity, described voltage generating unit respectively, and the second end of described second electric capacity is connected with described public electrode.
Described second electric capacity is the electric capacity that the overlapping part of the drain electrode of described public electrode and described 3rd thin film transistor (TFT) arranged by layering produces.
A kind of display panel, comprises above-mentioned pixel-driving circuit.
A kind of display device, comprises above-mentioned display panel.
A kind of image element driving method, be applicable to display panel, it is characterized in that, described display panel comprises multiple pixel cell in matrix distribution, described pixel cell is connected with data driver by data line, is connected with scanner driver by sweep trace, and each pixel cell comprises pixel electrode, public electrode, voltage generating unit, voltage couples unit, each pixel cell connects the first sweep trace and the second sweep trace, and described method comprises:
Under the control of described first sweep trace, the first voltage signal that described voltage generating unit is transmitted by described data line generates the initial voltage signal between pixel electrode and public electrode;
Under the control of described second sweep trace, the second voltage signal that described voltage couples unit is transmitted by described data line boosts to described initial voltage signal.
The pixel-driving circuit that the embodiment of the present invention provides, display panel, display device and image element driving method, voltage generating unit and voltage couples unit is added in a dot structure, use two sweep traces control voltage generation unit and voltage couples unit respectively, pixel electrode initial voltage is generated by voltage generating unit, and by voltage couples unit, coupling amplification is carried out to this pixel electrode initial voltage, use less data line driving voltage just can obtain higher pixel electrode voltage, the power consumption of data line drive circuit is reduced greatly, thus reduce the cooling requirements of devices function, the reliability of raising equipment, and can economize energy.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of a pixel cell in a kind of pixel-driving circuit in the embodiment of the present invention;
Fig. 2 is the sequential chart of the first sweep trace in Fig. 1, the second sweep trace, data line and A point voltage;
Fig. 3 is the process flow diagram of a kind of image element driving method in the embodiment of the present invention.
Description of reference numerals:
1, voltage generating unit 2, voltage couples unit
D, data line V, public electrode G1, the first sweep trace G2, the second sweep trace
T1, the first film transistor T2, the second thin film transistor (TFT) T3, the 3rd thin film transistor (TFT)
The equivalent capacity of C1, the first electric capacity C2, the second electric capacity C3, liquid crystal layer
The equivalent resistance of R, liquid crystal layer
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.
The embodiment of the present invention provides a kind of pixel-driving circuit, comprise multiple pixel cell in matrix distribution, pixel cell is connected with data driver by data line, be connected with scanner driver by sweep trace, as shown in Figure 1, each pixel cell comprises pixel electrode (A of node shown in Fig. 1), public electrode V, and each pixel cell connects the first sweep trace G1 and the second sweep trace G2; Each pixel cell also comprises: voltage generating unit 1, and under the control of the first sweep trace G1, the first voltage signal transmitted by data line D generates the initial voltage signal between pixel electrode and public electrode V; Voltage couples unit 2, under the control of the second sweep trace G2, the second voltage signal transmitted by data line D is boosted to the initial voltage signal between pixel electrode and public electrode V.Particularly, first sweep trace G1 and the second sweep trace G2 exports high level signal under control of the clock signal successively, in the first moment, when the signal control voltage generation unit 1 of the first sweep trace G1 is opened, the signal control voltage coupling unit 2 of the second sweep trace G2 turns off, after entering for the second moment by the first moment, when the signal control voltage generation unit 1 of the first sweep trace G1 turns off, the signal control voltage coupling unit 2 of the second sweep trace G2 is opened; Voltage generating unit 1 is connected with the first sweep trace G1, data line D, pixel electrode, public electrode V; Voltage couples unit 2 is connected with the second sweep trace G2, voltage generating unit 1, data line D, public electrode V.In Fig. 1, electric capacity C3 and resistance R is equivalent capacity and the resistance of liquid crystal layer in display panels.
When pixel-driving circuit work provided by the invention, in the first moment, signal in first sweep trace is high level, signal in second sweep trace is low level, now, voltage generating unit 1 is opened according to the high level signal in the first sweep trace, and generates the initial voltage signal of pixel electrode according to data line signal, and keeping the initial voltage signal of this generation, voltage couples unit 2 turns off according to low level signal in the second sweep trace.
In the second moment, signal in first sweep trace transfers low level to by high level, signal in second sweep trace has low level to transfer high level to, now, voltage generating unit 1 turns off according to the low level signal in the first sweep trace, the initial voltage signal of the pixel electrode that the first moment generated is saved, voltage couples unit 2 is opened according to high level signal in the second sweep trace, and according to data line signal, the initial voltage signal that the first moment generated pixel electrode is coupled, the voltage of pixel electrode is raised.
Repeat said process, pixel electrode voltage is amplified, namely uses less data line driving voltage just can obtain higher pixel electrode voltage, thus drive pixel electrode, change the light transmission rate of liquid crystal.
The pixel-driving circuit that the embodiment of the present invention provides, voltage generating unit and voltage couples unit is added in a dot structure, use two sweep traces control voltage generation unit and voltage couples unit respectively, pixel electrode initial voltage is generated by voltage generating unit, and by voltage couples unit, coupling amplification is carried out to this initial voltage, use less data line driving voltage just can obtain higher pixel electrode voltage, the power consumption of data line drive circuit is reduced greatly, thus reduce the cooling requirements of devices function, the reliability of raising equipment, and can economize energy.
Further, in embodiments of the present invention, as shown in Figure 1, described voltage generating unit 1 comprises:
The first film transistor T1, the second thin film transistor (TFT) T2, the first electric capacity C1;
The grid of described the first film transistor T1 and the grid of described second thin film transistor (TFT) T2, be all connected with described first sweep trace G1; The source electrode of described the first film transistor T1 is connected with described data line D; The drain electrode of described the first film transistor T1, is connected with the first end of described pixel electrode (pixel electrode is connected to figure interior joint A) and described first electric capacity C1; Second end of described first electric capacity C1 is connected with the source electrode of described second thin film transistor (TFT) T2 and described voltage couples unit 2; The drain electrode of described second thin film transistor (TFT) T2 is connected with described public electrode V.
Further, the first electric capacity C1 can be by layering and the electric capacity of the overlapping part generation of the pixel electrode of mutually insulated setting and the source electrode of the second thin film transistor (TFT) T2.
Described voltage couples unit 2 comprises:
3rd thin film transistor (TFT) T3 and the second electric capacity C2;
The grid of described 3rd thin film transistor (TFT) T3 is connected with described second sweep trace G2; The source electrode of described 3rd thin film transistor (TFT) T3 is connected with described data line D; The drain electrode of described 3rd thin film transistor (TFT) T3 is connected with the source electrode of the first end of described second electric capacity C2, second end of described first electric capacity C1 and described second thin film transistor (TFT) T2 respectively, and second end of described second electric capacity C2 is connected with described public electrode V.
Further, the second electric capacity C2 is by layering and the electric capacity of the overlapping part generation of the public electrode of mutually insulated setting and the drain electrode of the 3rd thin film transistor (TFT) T3.
Due in display panels, liquid crystal layer is clipped between the pixel electrode of array base palte and the public electrode of color membrane substrates, so the two ends of the equivalent resistance R of the two ends of the equivalent capacity C3 of liquid crystal and liquid crystal, connect pixel electrode (A of node shown in figure) and public electrode V all respectively.
When pixel-driving circuit work provided by the invention, respectively to data line D, the first sweep trace G1 and the second sweep trace G2 input clock signal as shown in Figure 2.In fig. 2 within two moment that the first sweep trace and the second sweep trace are opened respectively, data line D exports the first voltage signal values Vd1 and the second voltage signal values Vd2 respectively, it should be noted that, Vd1 and Vd2 can be unequal, illustrate only the situation of Vd1=Vd2 in Fig. 2.
As shown in Figure 2, at the first moment t1, first sweep trace G1 is noble potential, second sweep trace G2 is electronegative potential, the first film transistor T1 and the second thin film transistor (TFT) T2 conducting, now the first voltage signal values Vd1 of data line D is stored into the first electric capacity C1 by the first film transistor T1, and that is node A place is the first voltage signal values Vd1 of data line D, and now the 3rd thin film transistor (TFT) T3 turns off, the voltage of figure interior joint B is the voltage of public electrode V;
And at the second moment t2, second sweep trace G2 is noble potential, first sweep trace G1 is electronegative potential, 3rd thin film transistor (TFT) T3 conducting, now the second voltage signal values Vd2 of data line D is stored into the second electric capacity C2 by the 3rd thin film transistor (TFT) T3, and that is Node B is the second voltage signal values Vd2 of data line D; Because now the first film transistor T1 and the second thin film transistor (TFT) T2 is in closed condition, along with the increase of node B voltage, the voltage of node A can be increased again by the capacitance coupling effect of the first electric capacity C1.
Particularly, according to capacitance coupling effect,
Wherein, V
afor the magnitude of voltage of A point, i.e. the magnitude of voltage of pixel electrode, C1 is the capacitance of the first electric capacity, and C3 is the capacitance of the equivalent capacity of liquid crystal layer in liquid crystal panel.As shown in the sequential chart of A point voltage in Fig. 2, A point voltage, namely the voltage of pixel electrode has twice increase process, specifically increase once when the first sweep trace G1 is noble potential, increase once again when the second sweep trace G2 is noble potential, thus realize using lower data line driving voltage to obtain relatively high pixel drive voltage.
The pixel-driving circuit that the embodiment of the present invention provides, three thin film transistor (TFT)s and two electric capacity are used in a dot structure, unlatching and the shutoff of thin film transistor (TFT) is controlled by two sweep traces, capacitance coupling effect is utilized to carry out coupling amplification to pixel electrode voltage, structure is simple, be convenient to realize, use less data line driving voltage just can obtain higher pixel electrode voltage, the power consumption of data line drive circuit is reduced greatly, thus reduce the cooling requirements of devices function, the reliability of raising equipment, and can economize energy.
The embodiment of the present invention also provides a kind of display panel, comprises above-mentioned pixel-driving circuit.The structure that pixel-driving circuit is concrete and principle same as the previously described embodiments, do not repeat them here.
The embodiment of the present invention also provides a kind of display device, comprises above-mentioned display panel.
As shown in Figure 3, the embodiment of the present invention also provides a kind of image element driving method for above-mentioned display panel or display device, described display panel or display device comprise multiple pixel cell in matrix distribution, described pixel cell is connected with data driver by data line, be connected with scanner driver by sweep trace, each pixel cell comprises pixel electrode, public electrode, voltage generating unit, voltage couples unit, each pixel cell connects the first sweep trace and the second sweep trace, and described method comprises:
Step 101, under the control of the first sweep trace, the first voltage signal that voltage generating unit is transmitted by described data line generates the initial voltage signal between pixel electrode and public electrode;
Step 102, under the control of the second sweep trace, the second voltage signal that voltage couples unit is transmitted by described data line boosts to described initial voltage signal.
Concrete image element driving method is same as the previously described embodiments, does not repeat them here.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (8)
1. a pixel-driving circuit, comprise multiple pixel cell in matrix distribution, described pixel cell is connected with data driver by data line, be connected with scanner driver by sweep trace, each pixel cell comprises pixel electrode, public electrode, it is characterized in that
Each pixel cell connects the first sweep trace and the second sweep trace;
Each pixel cell also comprises:
Voltage generating unit, under the control of the first sweep trace, the first voltage signal transmitted by described data line generates the initial voltage signal between pixel electrode and public electrode;
Voltage couples unit, under the control of the second sweep trace, the second voltage signal transmitted by described data line is boosted to the initial voltage signal between pixel electrode and public electrode.
2. pixel-driving circuit according to claim 1, it is characterized in that, described voltage generating unit comprises:
The first film transistor, the second thin film transistor (TFT), the first electric capacity;
The grid of described the first film transistor and the grid of described second thin film transistor (TFT), be all connected with described first sweep trace; The source electrode of described the first film transistor is connected with described data line; The drain electrode of described the first film transistor, is connected with the first end of described pixel electrode and described first electric capacity; Second end of described first electric capacity is connected with the source electrode of described second thin film transistor (TFT) and described voltage couples unit; The drain electrode of described second thin film transistor (TFT) is connected with described public electrode.
3. pixel-driving circuit according to claim 2, is characterized in that, described first electric capacity is the electric capacity that the overlapping part of the source electrode of described pixel electrode and described second thin film transistor (TFT) arranged by layering produces.
4. pixel-driving circuit according to claim 1, it is characterized in that, described voltage couples unit comprises:
3rd thin film transistor (TFT) and the second electric capacity;
The grid of described 3rd thin film transistor (TFT) is connected with described second sweep trace; The source electrode of described 3rd thin film transistor (TFT) is connected with described data line; The drain electrode of described 3rd thin film transistor (TFT) is connected with the first end of described second electric capacity, described voltage generating unit respectively, and the second end of described second electric capacity is connected with described public electrode.
5. pixel-driving circuit according to claim 4, is characterized in that, described second electric capacity is the electric capacity that the overlapping part of the drain electrode of described public electrode and described 3rd thin film transistor (TFT) arranged by layering produces.
6. a display panel, comprises the pixel-driving circuit described in any one of claim 1-5.
7. a display device, comprises display panel according to claim 6.
8. an image element driving method, be applicable to display panel, it is characterized in that, described display panel comprises multiple pixel cell in matrix distribution, described pixel cell is connected with data driver by data line, is connected with scanner driver by sweep trace, and each described pixel cell comprises pixel electrode, public electrode, voltage generating unit, voltage couples unit, each described pixel cell connects the first sweep trace and the second sweep trace, and described method comprises:
Under the control of described first sweep trace, the first voltage signal that described voltage generating unit is transmitted by described data line generates the initial voltage signal between pixel electrode and public electrode;
Under the control of described second sweep trace, the second voltage signal that described voltage couples unit is transmitted by described data line boosts to described initial voltage signal.
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| CN107272237B (en) * | 2017-08-14 | 2020-02-18 | 深圳市华星光电技术有限公司 | Liquid crystal display and display device with three-thin film transistor structure |
| CN108538240B (en) * | 2018-05-29 | 2020-03-10 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN110189710B (en) * | 2019-04-04 | 2021-12-17 | 上海天马微电子有限公司 | Driving circuit and driving method thereof, electrowetting panel and driving method thereof |
| CN112201213B (en) * | 2020-10-22 | 2022-11-04 | 昆山龙腾光电股份有限公司 | Pixel circuit and display device |
| CN116758865A (en) * | 2023-06-29 | 2023-09-15 | 重庆惠科金渝光电科技有限公司 | Display panel, driving method thereof and electronic equipment |
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| CN101295112A (en) * | 2007-04-26 | 2008-10-29 | 中华映管股份有限公司 | LCD panel, LCD image element circuit and driving method thereof |
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| JP3959253B2 (en) * | 2001-10-02 | 2007-08-15 | 株式会社日立製作所 | Liquid crystal display device and portable display device |
| CN101191922B (en) * | 2006-12-01 | 2010-04-14 | 群康科技(深圳)有限公司 | LCD display panel |
| JP5072489B2 (en) * | 2007-08-30 | 2012-11-14 | 株式会社ジャパンディスプレイウェスト | Display device, driving method thereof, and electronic apparatus |
| WO2009116200A1 (en) * | 2008-03-18 | 2009-09-24 | シャープ株式会社 | Display device and drive method for the same |
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| CN101295112A (en) * | 2007-04-26 | 2008-10-29 | 中华映管股份有限公司 | LCD panel, LCD image element circuit and driving method thereof |
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