CN203982749U - Image element circuit and display device - Google Patents
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- CN203982749U CN203982749U CN201420327125.0U CN201420327125U CN203982749U CN 203982749 U CN203982749 U CN 203982749U CN 201420327125 U CN201420327125 U CN 201420327125U CN 203982749 U CN203982749 U CN 203982749U
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- 238000004146 energy storage Methods 0.000 claims abstract description 25
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Abstract
The utility model provides a kind of image element circuit and display device, this image element circuit comprises two sub-pixel circuits, each sub-pixel circuits comprises: each sub-pixel circuits comprises: five switch elements, driver element, energy-storage units and electroluminescence cells, two sub-pixel circuits share same data voltage line, and shared multi-strip scanning signal wire.In the image element circuit that the utility model provides, the working current of electroluminescence cell device of flowing through can not be subject to the impact of the threshold voltage of corresponding driving transistors, has thoroughly solved the problem that causes display brightness inequality due to the threshold voltage shift of driving transistors.In the utility model, complete the driving of two pixels with a compensating circuit, two adjacent pixels share many barss circuit simultaneously, can reduce in display device the signal line number for image element circuit, reduce integrated circuit cost, and reduce pel spacing, improve picture element density.
Description
Technical field
The utility model relates to display technique field, relates in particular to a kind of image element circuit and display device.
Background technology
Organic light emitting display (OLED) is one of focus of current flat-panel monitor research field, compares with liquid crystal display, the advantage such as OLED has that low energy consumption, production cost are low, autoluminescence, wide visual angle and fast response time.At present, at demonstration field OLED such as mobile phone, PDA, digital cameras, started to replace traditional liquid crystal (LCD) display screen.Pixel-driving circuit design is OLED display core technology content, has important Research Significance.
Utilize stable Control of Voltage brightness different from TFT (Thin Film Transistor (TFT))-LCD, OLED belongs to current drives, needs stable electric current to control luminous.
Due to reasons such as manufacturing process and device agings, in original 2T1C driving circuit (comprising two Thin Film Transistor (TFT) and an electric capacity), there is unevenness in the threshold voltage of the drive TFT of each pixel, with regard to having caused flowing through the electric current of each pixel OLED, change and make display brightness uneven like this, thereby affect the display effect of whole image.
And in prior art, an image element circuit is generally corresponding to a pixel, each image element circuit at least comprises a data pressure-wire, operating voltage line and multi-strip scanning signal wire, so just causes corresponding manufacture craft comparatively complicated, and is unfavorable for dwindling pel spacing.
Utility model content
The purpose of this utility model is the problem that solves display device display brightness inequality, and reduces in display device for the signal line number of image element circuit, reduces integrated circuit cost, improves the picture element density of display device simultaneously.
To achieve these goals, the utility model provides a kind of image element circuit, comprises two sub-pixel circuits;
Each sub-pixel circuits comprises: the first switch element, second switch unit, the 3rd switch element, the 4th switch element, the 5th switch element, driver element, energy-storage units and electroluminescence cell; And,
The first end of the first switch element connects operating voltage line, and the second end of the first switch element connects the input end of driver element, under the control of the scan signal line accessing for the control end at the first switch element, to described driver element, provides operating voltage; The second end of the first switch element also connects the first end of energy-storage units, makes the first end charging of operating voltage alignment energy-storage units under the control for the scan signal line that accesses at control end;
The first end of second switch unit is connected to the second end of energy-storage units, the second end ground connection of second switch unit, under the control of the scan signal line accessing for the control end in second switch unit by the voltage zero setting of the second end of described energy-storage units;
The first end of the 3rd switch element is connected between the output terminal and electroluminescence cell of driver element, the second end ground connection of the 3rd switch element, under the control of the scan signal line accessing for the control end in second switch unit by the output head grounding of driver element;
The first end of the 4th switch element is connected to data voltage line, the second end of the 4th switch element is connected to the control end of driver element, under the control of the scan signal line accessing for the control end at the 4th switch element, the control end of driver element is connected to data voltage line;
The first end of the 5th switch element is connected to the control end of driver element, the second end is connected to the second end of energy-storage units, under the control of the scan signal line accessing for the control end at the 5th switch element, the voltage of the control end of driver element is set to the voltage of the second end of energy-storage units;
And in two sub-pixel circuits, the first end of the 4th switch element accesses same data voltage line, the control end of the first switch element all connects the first scan signal line, the control end of second switch unit and the 3rd switch element is all connected the second scan signal line, and the control end of the 5th switch element all connects the 3rd scan signal line; The control end of the 4th switch element of the first sub-pixel circuits is connected to the second scan signal line, and the control end of the 4th switch element of the second sub-pixel circuits is connected to the 4th scan signal line.
Preferably, described the 4th scan signal line and described the 3rd scan signal line are same scan signal line, and the 4th switch element of the second sub-pixel circuits is different from the channel type of the 5th switch element.
Preferably, described the 4th scan signal line and described the 3rd scan signal line are different scan signal lines, and the channel type of each switch element and driver element is identical.
Preferably, each switch element and each driver element are Thin Film Transistor (TFT), the control end of each switch element is the grid of Thin Film Transistor (TFT), the first end of each switch element is the source electrode of Thin Film Transistor (TFT), the drain electrode that the second end of each switch element is Thin Film Transistor (TFT), the control end of each driver element is the grid of Thin Film Transistor (TFT), the first end of each driver element is the source electrode of Thin Film Transistor (TFT), the drain electrode that the second end of each driver element is Thin Film Transistor (TFT).
Preferably, described energy-storage units is electric capacity.
Preferably, described electroluminescence cell is Organic Light Emitting Diode.
The utility model also provides a kind of display device, it is characterized in that, comprises the image element circuit described in above-mentioned any one.
Preferably, two of described image element circuit sub-pixel circuits lay respectively in two neighbors.
Preferably, described two neighbors lay respectively at the both sides of described data voltage line.
Preferably, described two neighbors are positioned at the same side of described data voltage line.
In the image element circuit that the utility model provides, the working current of the electroluminescence cell of flowing through can not be subject to the impact of the threshold voltage of corresponding driving transistors, has thoroughly solved the problem that causes display brightness inequality due to the threshold voltage shift of driving transistors.In the utility model, complete the driving of two pixels with a compensating circuit, two adjacent pixels share many barss circuit simultaneously, can reduce in display device the signal line number for image element circuit, reduce integrated circuit cost, and reduce pel spacing, improve picture element density.
Accompanying drawing explanation
The structural representation of the image element circuit that Fig. 1 provides for the utility model embodiment mono-;
The sequential chart of key signal in the image element circuit that Fig. 2 provides for the utility model embodiment mono-;
Fig. 3 a-Fig. 3 d is the current direction of image element circuit under different sequential and the schematic diagram of magnitude of voltage in the utility model embodiment mono-;
The structural representation of the image element circuit that Fig. 4 provides for the utility model embodiment bis-;
The sequential chart of key signal in the image element circuit that Fig. 5 provides for the utility model embodiment bis-;
The schematic diagram of a kind of position relationship of image element circuit and pixel in the display device that Fig. 6 provides for the utility model embodiment;
The schematic diagram of the another kind of position relationship of image element circuit and pixel in the display device that Fig. 7 provides for the utility model embodiment.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples are only for the technical solution of the utility model is more clearly described, and can not limit protection domain of the present utility model with this.
Embodiment mono-
The utility model embodiment mono-provides a kind of image element circuit, as shown in Fig. 1 or Fig. 3 a-Fig. 3 d, comprising: two sub-pixel circuits P1 and P2, and each sub-pixel circuits is here corresponding to a pixel; Each pixel electronic circuit comprises: five switch element T1, T2, T3, T4, T5, a driver element DT, an energy-storage units C, an electroluminescence cell L is (for the ease of distinguishing, in Fig. 1 or Fig. 3 a-Fig. 3 d, five switch elements in P2 are expressed as T1 ', T2 ', T3 ', T4 ', T5 ', driver element is expressed as DT ', and energy-storage units is C ', and electroluminescence cell is L ', lower same)
The something in common of two sub-pixel circuits is (in conjunction with P1, describing):
The control end of T1 is connected to the first scan signal line Em, and the first end of T1 is connected to operating voltage line V
ddthe second end of T1 is connected to the input end of DT, under the control of the scan signal line accessing for the control end at T1, to driver element DT, provide operating voltage, the second end of T1 also connects the first end a1 of energy-storage units C simultaneously, makes operating voltage line V under the control of the scan signal line accessing for the control end at T1
ddfirst end a1 charging to energy-storage units C;
The control end of T2, T3 is connected to the second scan signal line Scan[1]; The first end of T2 is connected to the second end b1 end of C (for C ', its first end is the a2 end shown in figure, the second end is the b2 end shown in figure), the second end ground connection of T2, under the control of the scan signal line accessing for the control end at T2 by the voltage zero setting of the second end of energy-storage units C;
The first end of T3 is connected to the output terminal of DT, the second end ground connection of T3, under the control of the scan signal line accessing for the control end at T3 by the output head grounding of driver element DT;
The first end of T4 is connected to data voltage line V
data, the second end of T4 is connected to the control end D1 end (for DT ', its input end is the D2 shown in figure) of DT, under the control of the scan signal line accessing for the control end at T4, the control end D1 of driver element is connected to data voltage line V
data;
The control end of T5 is connected to the 3rd scan signal line Scan[2], first end is connected to the control end D1 of DT (for DT ', its control end is the D2 end shown in figure), the second end is connected to the b1 end of C, under the control of the scan signal line accessing for the control end at T5, the voltage of the control end D1 of driver element DT is set to the voltage of the second end a2 of energy-storage units C;
The input end of DT is also connected with the first end a1 end of C, and output terminal is also connected with L;
The difference of two sub-pixel circuits is:
In P1, the control end of T4 is connected to Scan[1], in P2, the control end of T4 ' is connected to Scan[2]; And the channel type of the T4 of P1 is different from T5, the channel type of the T4 ' of P2 is different from T5 '.
Be understandable that, except above-mentioned ben T4 and T5, T4 ' is different from the channel type of T5 ', for other switch element, control end is connected to a plurality of switch elements of same scan signal line (such as being connected to two switch element T1 and the T1 ' of Em, be connected to Scan[1] two switch element T2, T3, T2 ', T3 ' and T4, be connected to Scan[2] two switch element T5 and T5 ') should be the switch of same channel type, be all high level conducting or be all low level conducting, thereby conducting or the off state of two switch elements that guarantees to be connected to same scan signal line is identical.
In the image element circuit that the utility model provides, the working current of the electroluminescence cell of flowing through can not be subject to the impact of the threshold voltage of corresponding driving transistors, has thoroughly solved the problem that causes display brightness inequality due to the threshold voltage shift of driving transistors.Simultaneously in the utility model, with a compensating circuit, complete the driving of two pixels, compressed the number of the TFT device of compensation, and reduced by a data pressure-wire, thereby reduced the number of signal line, can significantly reduce like this pel spacing size and reduce IC cost, thereby obtaining higher picture element density.
Preferably, each switch element and each driver element are Thin Film Transistor (TFT) TFT, the control end of each switch element is grid, the first end of each switch element is the source electrode of Thin Film Transistor (TFT), the drain electrode that the second end of each switch element is field effect transistor, the input end of each driver element is the source electrode of field effect transistor, the grid that the control end of each driver element is field effect transistor, the drain electrode that the output terminal of each driver element is field effect transistor.Certainly switch element and driver element can be also other suitable device or combination of devices.
Be understood that, the transistor that transistor corresponding to the driver element here and switch element can exchange for source-drain electrode, or according to the difference of conducting type, the first end of each switch element and driver element may be transistorized drain electrode, the second end is transistorized source electrode, those skilled in the art are not paying under the prerequisite of performing creative labour, it is resulting that in the image element circuit that the utility model is provided, each transistor carries out the reversal connection of source-drain electrode, the same or analogous circuit structure of technique effect that the technical scheme that can obtain provides with the utility model can reach should fall into protection domain of the present utility model equally.
Preferably, described energy-storage units C is electric capacity.Certainly in practical application, according to design, need also to adopt other to there is the element of energy-storage function.
Preferably, described electroluminescence cell L can be Organic Light Emitting Diode (OLED).Certainly in practical application, according to design, need also to adopt other to there is the element of electroluminescence function.
The principle of work of image element circuit the utility model preferred embodiment being provided below in conjunction with Fig. 2 and Fig. 3 a-Fig. 3 d is elaborated, the image element circuit that being illustrated in figure 2 the utility model provides is input to the sequential chart of the sweep signal in each scan signal line while working, can be divided into four-stage, in Fig. 2, be expressed as reset phase W1, the first discharge regime W2, the second discharge regime W3, glow phase W4, in each stage, the current direction of image element circuit and magnitude of voltage are respectively as shown in Fig. 3 a, Fig. 3 b, Fig. 3 c, Fig. 3 d.For convenience of description, take T5 and T5 ' as N channel-type TFT, other TFT are that P channel-type TFT describes.
At reset phase W1, as shown in Figure 2, each scan signal line is low level, the data voltage V of data voltage line
data=V
1, V
1for the corresponding voltage of Organic Light Emitting Diode L, now only T5 and T5 ' disconnect, the equal conducting of other TFT, and its current direction is as shown in the La in Fig. 3 a, and the a2 end of the a1 of this stage capacitor C end and capacitor C is connected to operating voltage line V
dd, electromotive force is V
dd, operating voltage line V
ddcontinue to C and C ' charging, after having charged, the b2 of the b1 of capacitor C end and C ' holds equal ground connection, and the D1 end that electromotive force is 0, DT and the D2 end of DT ' are all connected to respectively V
data, electromotive force is V1.
At the first discharge regime W2, as shown in Figure 2, in scan signal line, Em is high level, Scan[1] and Scan[2] be low level, now T1, T1 ', T5, T5 ' turn-off, the equal conducting of other TFT, and its current direction is as shown in Lb1 and Lb2 in Fig. 3 b, C discharges along Lb1, C ' is along Lb2 electric discharge, and after electric discharge finishes, the potential drop of a1 end is to V
1+ V
th1, a2 end potential drop is to V
1+ V
th2, V wherein
th1and V
th2be respectively the threshold voltage of DT and DT '.
At the second discharge regime W3, as shown in Figure 2, in scan signal line, Scan[1 only] be high level, other scan signal lines are low level, data voltage V
data=V
2, V
2for the corresponding voltage of Organic Light Emitting Diode L ', now, only T4 ' and DT ' conducting, other TFT turn-off, and D2 end is connected to V
data, electromotive force is V2, and C ' is along the Lc electric discharge in Fig. 3 c, and after electric discharge finishes, a1 end electromotive force remains unchanged, and a2 end potential drop is to V
2+ V
th2.
At glow phase W4, as shown in Figure 2, in scan signal line, Em is high level, and other scan signal lines are low level, now T1, T1 ', T5, T5 ', and DT, DT ' conducting, other TFT turn-off, and a1 end and a2 hold and are connected to V
dd,, now there is isobaric saltus step in b1 end and b2 end suspension joint, and D1 point electromotive force is V
dd-V
1-V
th1, D2 point electromotive force is V
dd-V
2-V
th2, V
ddalong the Ld1 in Fig. 3 d and Ld2, L and L ' are supplied to induced current, make L and L ' luminous.
Known according to saturation current formula, the electric current I of the L that now flows through
l=K (V
gS-V
th1)
2=[V
dd– ([V
dd– V
1– V
th1) – V
th1]
2=K*V
1 2.
In like manner, I
l '=K*V
2 2.
The working current that can see two electroluminescence cells of now flowing through in above formula can not be subject to the impact of drive transistor threshold voltage, only with data voltage V now
datarelevant.Thoroughly solved drive TFT due to manufacturing process and operated and cause threshold voltage (V for a long time
th) problem of drift, eliminate its impact on the electric current of the electroluminescence cell of flowing through, guarantee the normal work of electroluminescence cell.Simultaneously in the utility model embodiment, two pixels share same data voltage line, operating voltage line, also only use three scan signal lines, have greatly reduced the number of corresponding signal line, reduce integrated circuit cost, and reduce pel spacing, improve picture element density.
Embodiment bis-
The image element circuit difference that the image element circuit that the utility model embodiment bis-provides and embodiment provide is, in P2, the control end of T4 ' is connected to the 4th sweep signal Scan[3] (referring to Fig. 4), the Scan[3 here] be different from above-mentioned Scan[2], now the channel type of the T4 ' of P2 can be identical with the channel type of T5, T5 ', also can be different.As long as on the basis of the embodiment of embodiment mono-, make that the conducting state of T4 ' is contrary with the conducting state of T5, T5 ' can realize the technical scheme that the utility model provides, its concrete principle no longer describes in detail at this.
Preferably, the channel type of each switch element and DT is identical.The manufacturing process that can guarantee like this each switch element and DT is consistent, reduces manufacture difficulty.
Preferably, as shown in Figure 4, each switch element and DT are P channel-type TFT.Now the sequential chart of this image element circuit each signal of input when work can be as shown in Figure 5.Compare with the sequential chart of the embodiment mono-shown in Fig. 2, because T5 and T5 ' become P transistor npn npn, therefore Scan[2] signal contrary, colleague is in order to make the conducting state of T4 ' contrary with the conducting state of T5 and T5 ', so increased with the present embodiment in Scan[2] the 4th sweep signal Scan[3 of signal inversion], its principle of work and embodiment mono-are similar, do not repeat them here.
Design based on identical, the utility model also provides a kind of display device, comprises the image element circuit shown in above-mentioned any one.
Preferably, in this display device, two sub-pixel circuits of image element circuit lay respectively in two neighbors.Can make like this distribution of components and parts on corresponding substrate more even.
Preferably, described two neighbors are positioned at the same side of its data voltage line, and Fig. 6 shows two neighbors that one of them image element circuit PU is corresponding at its corresponding data pressure-wire V
datathe situation of one side; Or described two neighbors lay respectively at the both sides of its data voltage line, Fig. 7 shows image element circuit PU is corresponding described in one of them two neighbors at its corresponding data pressure-wire V
datathe situation of both sides.
Display device can be: any product or parts with Presentation Function such as Electronic Paper, mobile phone, panel computer, televisor, display, notebook computer, digital album (digital photo frame), navigating instrument.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (10)
1. an image element circuit, is characterized in that, comprises two sub-pixel circuits;
Each sub-pixel circuits comprises: the first switch element, second switch unit, the 3rd switch element, the 4th switch element, the 5th switch element, driver element, energy-storage units and electroluminescence cell; And,
The first end of the first switch element connects operating voltage line, and the second end of the first switch element connects the input end of driver element, under the control of the scan signal line accessing for the control end at the first switch element, to described driver element, provides operating voltage; The second end of the first switch element also connects the first end of energy-storage units, makes the first end charging of operating voltage alignment energy-storage units under the control of the scan signal line accessing for the control end at the first switch element;
The first end of second switch unit is connected to the second end of energy-storage units, the second end ground connection of second switch unit, under the control of the scan signal line accessing for the control end in second switch unit by the voltage zero setting of the second end of described energy-storage units;
The first end of the 3rd switch element is connected between the output terminal and electroluminescence cell of driver element, the second end ground connection of the 3rd switch element, under the control of the scan signal line accessing for the control end at the 3rd switch element by the output head grounding of driver element;
The first end of the 4th switch element is connected to data voltage line, the second end of the 4th switch element is connected to the control end of driver element, under the control of the scan signal line accessing for the control end at the 4th switch element, the control end of driver element is connected to data voltage line;
The first end of the 5th switch element is connected to the control end of driver element, the second end is connected to the second end of energy-storage units, under the control of the scan signal line accessing for the control end at the 5th switch element, the voltage of the control end of driver element is set to the voltage of the second end of energy-storage units;
And in two sub-pixel circuits, the first end of the 4th switch element accesses same data voltage line, the control end of the first switch element all connects the first scan signal line, the control end of second switch unit and the 3rd switch element is all connected the second scan signal line, and the control end of the 5th switch element all connects the 3rd scan signal line; The control end of the 4th switch element of the first sub-pixel circuits is connected to the second scan signal line, and the control end of the 4th switch element of the second sub-pixel circuits is connected to the 4th scan signal line.
2. image element circuit as claimed in claim 1, is characterized in that, described the 4th scan signal line and described the 3rd scan signal line are same scan signal line, and the 4th switch element of the second sub-pixel circuits is different from the channel type of the 5th switch element.
3. image element circuit as claimed in claim 1, is characterized in that, described the 4th scan signal line and described the 3rd scan signal line are different scan signal lines, and the channel type of each switch element and driver element is identical.
4. image element circuit as claimed in claim 1, it is characterized in that, each switch element and each driver element are Thin Film Transistor (TFT), the control end of each switch element is the grid of Thin Film Transistor (TFT), the first end of each switch element is the source electrode of Thin Film Transistor (TFT), the drain electrode that the second end of each switch element is Thin Film Transistor (TFT), the control end of each driver element is the grid of Thin Film Transistor (TFT), the first end of each driver element is the source electrode of Thin Film Transistor (TFT), the drain electrode that the second end of each driver element is Thin Film Transistor (TFT).
5. image element circuit as claimed in claim 1, is characterized in that, described energy-storage units is electric capacity.
6. as the claim 1-5 image element circuit as described in any one wherein, it is characterized in that, described electroluminescence cell is Organic Light Emitting Diode.
7. a display device, is characterized in that, comprises the image element circuit as described in claim 1-6 any one.
8. display device as claimed in claim 7, other are characterised in that, two sub-pixel circuits of described image element circuit lay respectively in two neighbors.
9. display device as claimed in claim 8, is characterized in that, described two neighbors lay respectively at the both sides of described data voltage line.
10. display device as claimed in claim 8, is characterized in that, described two neighbors are positioned at the same side of described data voltage line.
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|---|---|---|---|
| CN201420327125.0U CN203982749U (en) | 2014-06-18 | 2014-06-18 | Image element circuit and display device |
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|---|---|---|---|
| CN201420327125.0U CN203982749U (en) | 2014-06-18 | 2014-06-18 | Image element circuit and display device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104078003A (en) * | 2014-06-18 | 2014-10-01 | 京东方科技集团股份有限公司 | Pixel circuit and display device |
| CN106486063A (en) * | 2016-10-26 | 2017-03-08 | 京东方科技集团股份有限公司 | Pixel-driving circuit and its driving method, display floater and display device |
| CN106504705A (en) * | 2016-11-24 | 2017-03-15 | 京东方科技集团股份有限公司 | Image element circuit and its driving method and display floater |
| CN106991966A (en) * | 2017-05-27 | 2017-07-28 | 京东方科技集团股份有限公司 | Array base palte and driving method, display panel and display device |
| CN111063301A (en) * | 2020-01-09 | 2020-04-24 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, array substrate and display device |
| CN114170984A (en) * | 2021-11-30 | 2022-03-11 | 重庆惠科金渝光电科技有限公司 | Display panel driving method and display panel |
-
2014
- 2014-06-18 CN CN201420327125.0U patent/CN203982749U/en not_active Expired - Lifetime
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| CN104078003A (en) * | 2014-06-18 | 2014-10-01 | 京东方科技集团股份有限公司 | Pixel circuit and display device |
| WO2015192586A1 (en) * | 2014-06-18 | 2015-12-23 | 京东方科技集团股份有限公司 | Pixel circuit and display device |
| CN104078003B (en) * | 2014-06-18 | 2016-08-31 | 京东方科技集团股份有限公司 | Image element circuit and display device |
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| CN106504705A (en) * | 2016-11-24 | 2017-03-15 | 京东方科技集团股份有限公司 | Image element circuit and its driving method and display floater |
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| US10679548B2 (en) | 2017-05-27 | 2020-06-09 | Boe Technology Group Co., Ltd. | Array substrate and driving method, display panel and display device |
| CN111063301A (en) * | 2020-01-09 | 2020-04-24 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, array substrate and display device |
| US11862085B2 (en) | 2020-01-09 | 2024-01-02 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Pixel circuit and driving method therefor, array substrate and display apparatus |
| CN111063301B (en) * | 2020-01-09 | 2024-04-12 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, array substrate and display device |
| CN114170984A (en) * | 2021-11-30 | 2022-03-11 | 重庆惠科金渝光电科技有限公司 | Display panel driving method and display panel |
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