CN203982748U - Image element circuit and display device - Google Patents
Image element circuit and display device Download PDFInfo
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- CN203982748U CN203982748U CN201420326522.6U CN201420326522U CN203982748U CN 203982748 U CN203982748 U CN 203982748U CN 201420326522 U CN201420326522 U CN 201420326522U CN 203982748 U CN203982748 U CN 203982748U
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- 238000004146 energy storage Methods 0.000 claims abstract description 21
- 238000005401 electroluminescence Methods 0.000 claims abstract description 13
- 239000010409 thin film Substances 0.000 claims description 26
- 230000008676 import Effects 0.000 claims description 3
- 241001417495 Serranidae Species 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 239000000758 substrate Substances 0.000 description 1
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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 access identical operating voltage line, data voltage line, the first scan signal line, the 3rd scan signal line, access the second different scan signal lines.In this image element circuit, the working current of the OLED device of flowing through is not 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.Complete the driving of two pixels with a compensating circuit simultaneously, two adjacent pixels share many barss circuit, can reduce the signal line number for image element circuit in display device, 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, the advantage such as compared with liquid crystal display, OLED has that low energy consumption, production cost are low, autoluminescence, wide visual angle and fast response time.At present, started to replace traditional LCDs (LCD) at demonstration field OLED such as mobile phone, PDA, digital cameras.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 the reason such as manufacturing process and device aging, 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, change and make display brightness inequality with regard to having caused flowing through the electric current of each pixel OLED like this, thereby affect the display effect of whole image.
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 the signal line number for image element circuit in display device, 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: 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 for the scan signal line that accesses at the control end of the first switch element, provides operating voltage to described driver element;
The first end of second switch unit is connected to the output terminal of driver element, the second end of second switch unit is connected with electroluminescent cell, and the drive current under the control for the scan signal line that accesses at the control end of second switch unit, described driver element being provided imports to described electroluminescent cell;
The first end of the 3rd switch element is connected to data voltage line, the second end of the 3rd switch element is connected to the input end of driver element, under the control for the scan signal line that accesses at the control end of the 3rd switch element, the input end of driver element is connected to data voltage line;
The first end of the 4th switch element connects the output terminal of driver element, the second end of the 4th switch element connects the first end of energy-storage units and the control end of driver element, under the control of the scan signal line that accesses at the control end of the 4th switch element by the control end conducting of the output terminal of driver element and driver element and the voltage of the output terminal of driver element is charged to the first end of described energy-storage units;
The first end of the 5th switch element is connected to the first end of energy-storage units, the second end ground connection of the 5th switch element, under the control of the scan signal line that accesses at the control end of the 5th switch element by the voltage zero setting of the first end of described energy-storage units;
And in two sub-pixel circuits, the first end of the 3rd switch element is connected to same data voltage line, and the control end of the first switch element and second switch unit all accesses the 3rd scan signal line, and the control end of the 5th switch element all accesses the 4th scan signal line; The 3rd switch element of the first sub-pixel circuits and the control end of the 4th switch element all access the first scan signal line; The 3rd switch element of the second sub-pixel circuits and the control end of the 4th switch element all access the second scan signal line.
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 source electrode that the input end of each driver element is Thin Film Transistor (TFT), the drain electrode that the output terminal of each driver element is Thin Film Transistor (TFT).
Preferably, each Thin Film Transistor (TFT) is P channel-type.
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 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 is not 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 the signal line number for image element circuit in display device, reduce integrated circuit cost, and reduce pel spacing, improve picture element density.
Brief description of the drawings
The structural representation of the image element circuit that Fig. 1 provides for the utility model embodiment;
The sequential chart of key signal in the image element circuit that Fig. 2 provides for the utility model embodiment;
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;
The schematic diagram of a kind of position relationship of image element circuit and pixel in the display device that Fig. 4 provides for the utility model embodiment;
The schematic diagram of a kind of position relationship of image element circuit and pixel in the display device that Fig. 5 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.
The utility model embodiment 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 that structure is identical, and each sub-pixel circuits is here corresponding to a pixel; Because the structure of P1 and P2 is identical, below only in conjunction with the structure of P1, two sub-pixel circuits are described;
The P1 here comprises: five switch element T1, T2, T3, T4, T5, a driver element DT, an energy-storage units C, an electroluminescence cell L (distinguishes for convenient, in Fig. 1 or Fig. 3 a-Fig. 3 d, five switch elements in P2 are expressed as T1 ', T2 ', T3 ', T4 ', T5 ', and driver element is expressed as DT ', and energy-storage units is C ', Organic Light Emitting Diode is L ', lower same), and
T1 be all connected to the 3rd scan signal line Scan[3 with control end T2];
The first end of T1 is connected to operating voltage line V
dd, the second end of T1 is connected to the input end of DT, under the control for the scan signal line that accesses at the control end of T1, provides operating voltage to driver element DT;
The first end of T2 is connected to the output terminal of DT, and the second end of T2 is connected with L, and the drive current under the control for the scan signal line that accesses at the control end of T2, driver element DT being provided imports to electroluminescent cell L;
The first end of T3 is connected to data voltage line V
data, the second end of T3 is connected to the input end of DT, under the control for the scan signal line that accesses at the control end of T3, the input end of driver element is connected to data voltage line V
data;
The first end of T4 is connected to the output terminal of DT, the second end is connected to the first end a1 end of C and the control end of DT (for C ', its first end is a2, the second end is b2), under the control of the scan signal line that accesses at the control end of T4 by the control end conducting of the output terminal of driver element DT and driver element DT and make the voltage of output terminal of driver element DT to the first end charging of energy-storage units C;
The first end of T5 is connected to the a1 end of C, and the second end is connected to the second end b1 end of C, under the control of the scan signal line that accesses at the control end of T5 by the voltage zero setting of the first end of energy-storage units C;
And in two sub-pixel circuits, the first end of T3 and T3 ' is connected to same data voltage line V
data, the control end of the first switch element and second switch unit all accesses the 3rd scan signal line Scan[3], the control end of the 5th switch element all accesses the 4th scan signal line Em; The 3rd switch element of the first sub-pixel circuits and the control end of the 4th switch element all access the first scan signal line Scan[1]; The 3rd switch element of the second sub-pixel circuits and the control end of the 4th switch element all access the second scan signal line Scan[2].
Be understandable that, control end is connected to two switch elements of same scan signal line (such as T1 and T1 ', T3 and T4, T3 ' and T4 ', T5 and T5 ') should be the switch of same channel type, be all high level conducting or be all low level conducting, thereby ensure that conducting or the off state of two switch elements that are connected to same scan signal line are identical.
In the image element circuit that the utility model provides, the working current of the electroluminescence cell of flowing through is not 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 the signal line number for image element circuit in display device, reduce integrated circuit cost, and reduce pel spacing, improve picture element density.
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 source electrode that the input end of each driver element is Thin Film Transistor (TFT), the drain electrode that the output terminal of each driver element is Thin Film Transistor (TFT).
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, in the image element circuit that the utility model is provided, each transistor carries out that the reversal connection of source-drain electrode obtains, the same or analogous circuit structure of technique effect that the technical scheme that can obtain provides with the utility model can reach is same should fall into protection domain of the present utility model.
Further, in the utility model embodiment, all each Thin Film Transistor (TFT) are P channel-type.Use the transistor of same type, can realize the unification of technological process, thereby improve the yields of product.It will be understood by those skilled in the art that; in actual applications; each transistorized type also can be incomplete same; such as T1 can be N channel transistor; and T2 can be P channel transistor; as long as it is identical to make control end be connected to the ON/OFF state of two switch elements of same scan signal line, can realize the technical scheme that the application provides, the utility model preferred embodiment should not be construed as the restriction to the utility model protection domain.
Preferably, described energy-storage units C is electric capacity.Certainly in practical application, need also to adopt other to there is the element of energy-storage function according to design.
Preferably, described electroluminescence cell L can be Organic Light Emitting Diode (OLED).Certainly in practical application, need also to adopt other to there is the element of electroluminescence function according to design.
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 work, can be divided into four-stage, in Fig. 2, be expressed as reset phase W1, the first charging stage W2, the second charging stage 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, taking each switch element and driver element as P channel-type TFT, the second end b1 and the b2 ground connection of two electric capacity are further elaborated.
At reset phase W1, as shown in Figure 2, in scan signal line, only Em1 low level, other scan signal lines are high level, now only T5 and T5 ' conducting, and other TFT turn-off, as shown in Figure 3 a, the now equal ground connection in the two ends of capacitor C and C ', the electromotive force that a1, a2, b1, b2 are ordered is zero.
At the first charging stage W2, as shown in Figure 2, in scan signal line, only Scan[1] be low level, other scan signal lines are high level, data voltage V
data=V
1, V1 is the corresponding voltage of Organic Light Emitting Diode L, now only T3, T4, DT conducting, and other switching TFT are turn-offed, the energy-storage units C charging of electric current in along the Lb in Fig. 3 b to P1, after charging finishes, the electromotive force that a1 is ordered is V
1– V
th1(pressure reduction meeting between the two poles of the earth, DT grid source is V
th1, wherein V
th1for the threshold voltage of DT).
At the second charging stage W3, as shown in Figure 2, in scan signal line, only Scan[2] be low level, other scan signal lines are high level, data voltage V
data=V
2, V2 is the corresponding voltage of Organic Light Emitting Diode L ', now only T3 ', T4 ', DT ' conducting, and other switching TFT are turn-offed, the energy-storage units C ' charging of electric current in along the Lc in Fig. 3 c to P2, after charging finishes, the electromotive force that a2 is ordered is V
2– V
th2(pressure reduction meeting between the two poles of the earth, DT ' grid source is V
th2, wherein V
th2for the threshold voltage of DT ').
At glow phase W4, as shown in Figure 2, in scan signal line, only Scan[3] be low level, other scan signal lines are high level, now T1, T2, T1 ', T2 ', DT, DT ' conducting, other TFT turn-off, V
ddalong the Ld1 in Fig. 3 d and Ld2, L and L ' are supplied to induced current respectively, 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
1– V
th1) – V
th1]
2=K (V
dd– V
1)
2.
In like manner, I
l=K (V
dd– V
2)
2.Be not subject to the impact of drive transistor threshold voltage by the working current that can see two electroluminescence cells of now flowing through in above formula, only with data voltage V now
datarelevant.Thoroughly solve drive TFT due to manufacturing process and operated and cause threshold voltage (V for a long time
th) problem of drift, eliminate the impact of its electric current on the electroluminescence cell of flowing through, ensure the normal work of electroluminescence cell.
Based on identical design, the utility model also provides a kind of display device, comprises the image element circuit described in above-mentioned any one.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.
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. 4 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. 5 shows two neighbors that one of them image element circuit PU is corresponding at its corresponding data pressure-wire V
datathe situation of both sides.
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 (9)
1. an image element circuit, is characterized in that, comprises two sub-pixel circuits;
Each sub-pixel circuits comprises: 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 for the scan signal line that accesses at the control end of the first switch element, provides operating voltage to described driver element;
The first end of second switch unit is connected to the output terminal of driver element, the second end of second switch unit is connected with electroluminescent cell, and the drive current under the control for the scan signal line that accesses at the control end of second switch unit, described driver element being provided imports to described electroluminescent cell;
The first end of the 3rd switch element is connected to data voltage line, the second end of the 3rd switch element is connected to the input end of driver element, under the control for the scan signal line that accesses at the control end of the 3rd switch element, the input end of driver element is connected to data voltage line;
The first end of the 4th switch element connects the output terminal of driver element, the second end of the 4th switch element connects the first end of energy-storage units and the control end of driver element, under the control of the scan signal line that accesses at the control end of the 4th switch element by the control end conducting of the output terminal of driver element and driver element and the voltage of the output terminal of driver element is charged to the first end of described energy-storage units;
The first end of the 5th switch element is connected to the first end of energy-storage units, the second end ground connection of the 5th switch element, under the control of the scan signal line that accesses at the control end of the 5th switch element by the voltage zero setting of the first end of described energy-storage units;
And in two sub-pixel circuits, the first end of the 3rd switch element is connected to same data voltage line, and the control end of the first switch element and second switch unit all accesses the 3rd scan signal line, and the control end of the 5th switch element all accesses the 4th scan signal line; The 3rd switch element of the first sub-pixel circuits and the control end of the 4th switch element all access the first scan signal line; The 3rd switch element of the second sub-pixel circuits and the control end of the 4th switch element all access the second scan signal line.
2. 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 source electrode that the input end of each driver element is Thin Film Transistor (TFT), the drain electrode that the output terminal of each driver element is Thin Film Transistor (TFT).
3. image element circuit as claimed in claim 2, is characterized in that, each Thin Film Transistor (TFT) is P channel-type.
4. image element circuit as claimed in claim 1, is characterized in that, described energy-storage units is electric capacity.
5. as the wherein image element circuit as described in any one of claim 1-4, it is characterized in that, described electroluminescence cell is Organic Light Emitting Diode.
6. a display device, is characterized in that, comprises the image element circuit as described in claim 1-5 any one.
7. display device as claimed in claim 6, other are characterised in that, two sub-pixel circuits of described image element circuit lay respectively in two neighbors.
8. display device as claimed in claim 7, is characterized in that, described two neighbors lay respectively at the both sides of described data voltage line.
9. display device as claimed in claim 7, is characterized in that, described two neighbors are positioned at the same side of described data voltage line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420326522.6U CN203982748U (en) | 2014-06-18 | 2014-06-18 | Image element circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420326522.6U CN203982748U (en) | 2014-06-18 | 2014-06-18 | Image element circuit and display device |
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|---|---|
| CN203982748U true CN203982748U (en) | 2014-12-03 |
Family
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|---|---|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104050919A (en) * | 2014-06-18 | 2014-09-17 | 京东方科技集团股份有限公司 | Pixel circuit and display device |
| CN106409221A (en) * | 2016-10-31 | 2017-02-15 | 昆山国显光电有限公司 | Multi-surface display pixel circuit and driving method thereof, and multi-surface OLED display |
| 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 |
| CN106683616A (en) * | 2017-02-09 | 2017-05-17 | 信利（惠州）智能显示有限公司 | Active-matrix-organic-light-emitting display device |
| 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 |
| WO2018219066A1 (en) * | 2017-05-31 | 2018-12-06 | 京东方科技集团股份有限公司 | Pixel circuit, driving method, display panel, and display device |
| CN109801593A (en) * | 2019-03-28 | 2019-05-24 | 京东方科技集团股份有限公司 | A kind of driving circuit, display panel and driving method |
-
2014
- 2014-06-18 CN CN201420326522.6U patent/CN203982748U/en not_active Withdrawn - After Issue
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015192488A1 (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 |
| CN104050919B (en) * | 2014-06-18 | 2016-03-16 | 京东方科技集团股份有限公司 | Image element circuit and display device |
| CN104050919A (en) * | 2014-06-18 | 2014-09-17 | 京东方科技集团股份有限公司 | Pixel circuit and display device |
| CN106409221A (en) * | 2016-10-31 | 2017-02-15 | 昆山国显光电有限公司 | Multi-surface display pixel circuit and driving method thereof, and multi-surface OLED display |
| CN106409221B (en) * | 2016-10-31 | 2019-05-31 | 昆山国显光电有限公司 | Multi-panel display pixel circuits and its driving method, multi-panel OLED display |
| US10269297B2 (en) | 2016-11-24 | 2019-04-23 | Boe Technology Group Co., Ltd. | Pixel circuit and driving method thereof, and display panel |
| 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 |
| CN106683616A (en) * | 2017-02-09 | 2017-05-17 | 信利（惠州）智能显示有限公司 | Active-matrix-organic-light-emitting display device |
| 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 |
| US10679548B2 (en) | 2017-05-27 | 2020-06-09 | Boe Technology Group Co., Ltd. | Array substrate and driving method, display panel and display device |
| WO2018219066A1 (en) * | 2017-05-31 | 2018-12-06 | 京东方科技集团股份有限公司 | Pixel circuit, driving method, display panel, and display device |
| US10770000B2 (en) | 2017-05-31 | 2020-09-08 | Boe Technology Group Co., Ltd. | Pixel circuit, driving method, display panel and display device |
| CN109801593A (en) * | 2019-03-28 | 2019-05-24 | 京东方科技集团股份有限公司 | A kind of driving circuit, display panel and driving method |
| CN109801593B (en) * | 2019-03-28 | 2020-06-23 | 京东方科技集团股份有限公司 | Driving circuit, display panel and driving method |
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