CN107492567A - A kind of display base plate and display device - Google Patents
A kind of display base plate and display device Download PDFInfo
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- CN107492567A CN107492567A CN201710763009.1A CN201710763009A CN107492567A CN 107492567 A CN107492567 A CN 107492567A CN 201710763009 A CN201710763009 A CN 201710763009A CN 107492567 A CN107492567 A CN 107492567A
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- 239000000758 substrate Substances 0.000 claims abstract description 79
- 238000005286 illumination Methods 0.000 claims abstract description 10
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- 239000002184 metal Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 239000002346 layers by function Substances 0.000 claims description 4
- 238000005401 electroluminescence Methods 0.000 abstract description 16
- 238000010586 diagram Methods 0.000 description 8
- 239000012535 impurity Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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Abstract
The invention discloses a kind of display base plate and display device, each image element circuit in display base plate includes substrate；Multiple image element circuits on substrate, each image element circuit include driving transistor and organic illuminating element；Driving transistor is used to provide driving current to organic illuminating element, and organic illuminating element lights for responding driving current；An at least electrode layer on substrate, upright projection covering driving transistor upright projection on substrate of the electrode layer on substrate, for the light in reflected illumination to electrode layer.Pass through technical scheme, it effectively prevent light and expose to driving transistor, reduce the degreeof tortuosity of the transfer characteristic curve of driving transistor, the repeatability of the original transfer characteristic curve of transfer characteristic curve and driving transistor after driving transistor compensation is improved, organic electroluminescence display panel is improved and shows the problem of uneven.
Description
Technical field
The present embodiments relate to display technology field, more particularly to a kind of display base plate and display device.
Background technology
Organic light-emitting display device has generally comprised several pixels, and each pixel includes image element circuit.Prior art is adopted
The simplest image element circuit of structure is 2T1C structures, i.e., image element circuit includes two transistors and 1 storage capacitance, its
In a transistor be switching transistor, another transistor is the luminous driving crystal of the organic illuminating element in driving pixel
Pipe, but the threshold voltage phase of driving organic illuminating element luminous driving current and driving transistor caused by driving transistor
Close, after the threshold voltage of driving transistor biases for a long time to drift about, influence driving current caused by driving transistor
Size, organic electroluminescence display panel is caused display to be present uneven.
In view of the above-mentioned problems, the compensation to drive transistor threshold voltage can be realized using nT1C structure at present, make
It is unrelated with the threshold voltage of driving transistor to obtain driving current caused by driving transistor.The corresponding transfer of driving transistor is special
The relation of driving current caused by voltage and driving transistor between the grid and source electrode of linearity curve, i.e. driving transistor is bent
Line, when the organic illuminating element in display panel is in glow phase, the driving transistor in image element circuit is constantly in partially
For configuration state to provide driving current to organic illuminating element, prolonged bias state make it that the transfer characteristic of driving transistor is bent
Line drifts about, and although can compensate for the threshold voltage of driving transistor by the image element circuit of nT1C structures, but drive brilliant
Body pipe compensation after characteristic wreath piece can not still be overlapped with original transfer characteristic curve, the grid of driving transistor and
When voltage between source electrode is identical, the driving current of driving organic illuminating element is of different sizes caused by driving transistor, leads
Cause organic electroluminescence display panel to exist and show the problem of uneven.Especially when there is light to expose to driving transistor so that
A greater degree of distortion occurs for the transfer characteristic curve of driving transistor, transfer characteristic curve and drive after driving transistor compensation
The repeatability of the original transfer characteristic curve of dynamic transistor is worse, has aggravated organic electroluminescence display panel and has shown uneven ask
Topic.
The content of the invention
In view of this, the present invention provides a kind of display base plate and display device, by setting at least one in display base plate
Layer electrode layer, make upright projection covering driving transistor upright projection on substrate of the electrode layer on substrate, and electrode layer
Light that can be on reflected illumination to electrode layer, effectively prevent light and exposes to driving transistor, reduce driving transistor
Transfer characteristic curve degreeof tortuosity, improve driving transistor compensation after transfer characteristic curve and driving transistor original
The repeatability of beginning transfer characteristic curve, improve organic electroluminescence display panel and show the problem of uneven.
In a first aspect, the embodiments of the invention provide a kind of display base plate, including：
Substrate；
Multiple image element circuits on the substrate, each image element circuit include driving transistor and organic light emission
Element；The driving transistor is used to provide driving current to the organic illuminating element, and the organic illuminating element is used to ring
The driving current is answered to light；
An at least electrode layer on the substrate, the electrode layer on the substrate upright projection covering described in
The upright projection of driving transistor on the substrate, for the light in reflected illumination to the electrode layer.
Second aspect, the embodiment of the present invention additionally provide a kind of display device, including the display base plate described in first aspect.
The embodiments of the invention provide a kind of display base plate and display device, is located at substrate by being set in display base plate
On at least one layer of electrode layer, make upright projection covering driving transistor vertical throwing on substrate of the electrode layer on substrate
Shadow, and the light that electrode layer can be on reflected illumination to electrode layer, the light for exposing to driving transistor has been blocked using electrode layer
Line, it effectively prevent light and expose to driving transistor, reduce the degreeof tortuosity of the transfer characteristic curve of driving transistor, carry
The repeatability of the original transfer characteristic curve of transfer characteristic curve and driving transistor after high driving transistor compensation, improves
Organic electroluminescence display panel shows the problem of uneven.
Brief description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, the application's is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 a are a kind of overlooking the structure diagram of display base plate provided in an embodiment of the present invention；
Fig. 1 b are the cross-sectional view in the AA ' directions along Fig. 1 a；
Fig. 2 is the cross-sectional view of another display base plate provided in an embodiment of the present invention；
Fig. 3 is the cross-sectional view of another display base plate provided in an embodiment of the present invention；
Fig. 4 is the cross-sectional view of another display base plate provided in an embodiment of the present invention；
Fig. 5 is the cross-sectional view of another display base plate provided in an embodiment of the present invention；
Fig. 6 is the overlooking the structure diagram of another display base plate provided in an embodiment of the present invention；
Fig. 7 is a kind of electrical block diagram of image element circuit provided in an embodiment of the present invention；
Fig. 8 is particular circuit configurations schematic diagram corresponding to image element circuit shown in Fig. 7；
Fig. 9 is a kind of driver' s timing figure of image element circuit provided in an embodiment of the present invention；
Figure 10 is a kind of structural representation of display device provided in an embodiment of the present invention.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that in order to just
Part related to the present invention rather than entire infrastructure are illustrate only in description, accompanying drawing.It is same or similar in this specification
Drawing reference numeral represent same or analogous structure, element or flow.It should be noted that in the case where not conflicting, this Shen
Please in embodiment and embodiment in feature can be mutually combined.
The embodiments of the invention provide a kind of display base plate, including substrate, multiple image element circuits on substrate and
An at least electrode layer on substrate, each image element circuit include driving transistor and organic illuminating element, driving transistor
For providing driving current to organic illuminating element, organic illuminating element lights for responding driving current, and electrode layer is in substrate
On upright projection of the upright projection covering driving transistor on substrate, for the light in reflected illumination to electrode layer.
Organic light-emitting display device has generally comprised several pixels, and each pixel includes image element circuit, and each pixel is driven
Generally include a driving transistor in circuit, in order that the threshold value of driving current caused by driving transistor and driving transistor
Voltage is unrelated, is required to compensate the threshold voltage of the driving transistor in image element circuit.Driving transistor corresponding one
The relation of driving current caused by voltage and driving transistor between the grid and source electrode of transfer characteristic curve, i.e. transistor is bent
Line.
When organic illuminating element in display panel is in glow phase, the driving transistor in image element circuit is constantly in
For bias state to provide driving current to organic illuminating element, prolonged bias state causes the transfer characteristic of driving transistor
Curve drifts about, characteristic after compensation even if pixel-driving circuit can compensate for the threshold voltage of driving transistor
Wreath piece can not still overlap with original transfer characteristic curve, when the voltage between the grid and source electrode of driving transistor is identical,
Driving current caused by driving transistor it is of different sizes, cause organic electroluminescence display panel exist show it is uneven the problem of.
Especially when there is light to expose to driving transistor, a greater degree of distortion occurs for the transfer characteristic curve of driving transistor,
The repeatability of the original transfer characteristic curve of transfer characteristic curve and driving transistor after driving transistor compensation is worse, aggravates
Organic electroluminescence display panel shows the problem of uneven.
The embodiment of the present invention makes electrode layer exist by setting at least one layer of electrode layer on substrate in display base plate
Upright projection of the upright projection covering driving transistor on substrate on substrate, and electrode layer can reflected illumination to electrode layer
On light, the light for exposing to driving transistor has been blocked using electrode layer, light has been effectively prevent and exposes to driving crystal
Pipe, the degreeof tortuosity of the transfer characteristic curve of driving transistor is reduced, improve the transfer characteristic after driving transistor compensation
The repeatability of curve and the original transfer characteristic curve of driving transistor, improve organic electroluminescence display panel show it is uneven
Problem.
Above is the core concept of the present invention, below in conjunction with the accompanying drawing in the embodiment of the present invention, to the embodiment of the present invention
In technical scheme be clearly and completely described.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
Under the premise of making creative work, the every other embodiment that is obtained belongs to the scope of protection of the invention.
Fig. 1 a are a kind of overlooking the structure diagram of display base plate provided in an embodiment of the present invention.As shown in Figure 1a, show
Substrate includes substrate 10, (Fig. 1 a exemplarily only show image element circuit 11 to multiple image element circuits 11 on substrate 10
Part-structure), and at least one layer of electrode layer 30 on substrate 10, an electrode layer 30 is exemplarily only shown here,
Image element circuit 11 includes driving transistor 15 and organic illuminating element (Fig. 1 is not shown), and driving transistor 15 is first to organic light emission
Part provides driving current, and organic illuminating element response driving current lights, to realize the display function of display base plate.Electrode layer 30
Upright projection covering driving transistor 15 upright projection on the substrate 10 on the substrate 10, can reflected illumination to electrode layer
Light on 30.
Optionally, electrode layer 30 can include multiple electrodes structure 301, set each electrode structure 301 to cover at least one
Individual driving transistor 15.Exemplary, as shown in figure 1, the upright projection of electrode structure 301 on the substrate 10 can cover two
The upright projection of driving transistor 15 on the substrate 10, the upright projection of electrode structure 301 on the substrate 10 can also cover one
The upright projection of individual driving transistor 15 on the substrate 10.Because electrode structure 301 can be on reflected illumination to electrode structure 301
Light, therefore the light exposed in the driving transistor 15 of counter electrode structure 301 can be blocked by electrode structure 301,
Also avoid driving transistor 15 to be irradiated by light, weaken the distortion journey of the transfer characteristic curve of driving transistor 15
Degree, to improve the weight of transfer characteristic curve and the original transfer characteristic curve of driving transistor 15 after driving transistor 15 compensates
Conjunction property, improve organic electroluminescence display panel and show the problem of uneven.
It should be noted that the embodiment of the present invention covers driving transistor 15 to the electrode structure 301 in electrode layer 30
Number is not construed as limiting, and ensures the upright projection covering driving transistor 15 of electrode structure 301 on the substrate 10 on the substrate 10
Upright projection, you can avoid driving transistor 15 from being irradiated by light.
Fig. 1 b are the cross-sectional view in the AA ' directions along Fig. 1 a.With reference to Fig. 1 a and Fig. 1 b, along the side away from substrate 10
To each driving transistor 15 includes active layer b4 and grid b1 successively, and active layer b4 includes doped region B and intrinsic region C, can be with
The upright projection covering active layer b4 of the electrode structure 301 of corresponding driving transistor 15 on the substrate 10 doped region B is set to exist
Upright projection on substrate 10.
Optionally, with reference to Fig. 1 a and Fig. 1 b, the border of the upright projection of electrode structure 301 on the substrate 10 can be set,
The distance between the borders of upright projection of the grid b1 of the driving transistor 15 covered with the electrode structure 301 on the substrate 10
D is more than or equal to 3 μm.Specifically, the active layer b4 of driving transistor 15 includes doped region B and intrinsic region C, doped region B is to have
Doped with N-type impurity or the region of p type impurity in active layer b4, positioned at the active layer b4 of driving transistor 15 intrinsic region C both sides,
The source electrode of corresponding driving transistor 15 and drain electrode are set, and intrinsic region C is the driving that the grid b1 of corresponding driving transistor 15 is set
The channel region of transistor 15, the part undoped with impurity or doped with few impurity, avoid driving transistor 15 source electrode and
Occurs the problem of short-circuit between drain electrode.
The size of driving current caused by driving transistor 15 is mainly by the movement of doped region B carrier in active layer b4
Characteristic decision, the i.e. transfer characteristic curve of the driving transistor 15 mainly shifting with doped region B carrier in driving transistor 15
Dynamic characteristic is related, sets the upright projection covering active layer b4 of electrode structure 301 on the substrate 10 doped region B on the substrate 10
Upright projection, electrode structure 301 can shelter from the most of light for the doped region B for exposing to active layer b4 so that irradiation
Light to active layer b4 doped region B greatly reduces, and then weakens the degreeof tortuosity of driving transistor transfer characteristic curve, carries
The repeatability of the original transfer characteristic curve of transfer characteristic curve and driving transistor after high driving transistor compensation, improvement have
Machine light emitting display panel shows the problem of uneven.
Active layer b4 intrinsic region C generally corresponds to the grid b1 settings of driving transistor 15 in driving transistor 15, active
Layer b4 doped region B borders are typically slightly distal to active layer b4 intrinsic region C border, set electrode structure 301 on the substrate 10
Upright projection border, the grid b1 vertical throwings on the substrate 10 with the driving transistor 15 of the electrode structure 301 covering
The distance between border of shadow is more than or equal to 3 μm so that the upright projection of electrode structure 301 on the substrate 10 can effectively be covered
The upright projections of the active layer b4 of driving transistor 15 doped region B on the substrate 10, reduce expose to drive to the full extent
Light on dynamic transistor 15 influences the degreeof tortuosity of the transfer characteristic curve of driving transistor.
Optionally, electrode layer 30 can be metal electrode layer, i.e., the electrode structure 301 in electrode layer 30 can be metal electricity
Pole structure.Specifically, except light irradiates, temperature is too high or the too high transfer characteristic that can also make driving transistor 15 of local temperature
A greater degree of distortion occurs for curve, original turn of the transfer characteristic curve and driving transistor 15 after the compensation of driving transistor 15
It is worse to move characteristic repeatability, aggravates organic electroluminescence display panel and shows the problem of uneven.Set on the substrate 10
The electrode layer 30 of the upright projection of upright projection covering driving transistor 15 on the substrate 10 is metal electrode layer, good using metal
Good heat conduction homogeneity so that the heat around driving transistor 15 is conducted rapidly, is avoided driving transistor 15 and is in temperature
Spending high environment influences the degreeof tortuosity of transfer characteristic curve of driving transistor 15, further increases driving transistor benefit
The repeatability of the original transfer characteristic curve of transfer characteristic curve and driving transistor after repaying, improves organic light emitting display face
Plate shows the problem of uneven.
Optionally, Fig. 2 is the cross-sectional view of another display base plate provided in an embodiment of the present invention.Such as Fig. 2 institutes
Show, along the direction away from substrate 10, organic illuminating element 14 includes first electrode 141, second electrode 142 and positioned at the successively
Light emitting functional layer 143 between one electrode 141 and second electrode 142, the first electrode 141 of each organic illuminating element 14 with it is right
The driving transistor 15 answered electrically connects, and electrode layer 30 includes multiple electrodes structure 301, can set the of organic illuminating element 14
One electrode 141 is multiplexed with electrode structure 301.
Exemplary, first electrode 141 can be the anode of organic illuminating element 14, and second electrode 142 can be organic
The negative electrode of light-emitting component 14, when voltage is applied on the anode and negative electrode of organic illuminating element 14, the carrier in anode
Carrier electrons in hole and negative electrode are moved to that light emitting functional layer 143 is compound, and the exciton in light emitting functional layer 143 is by excitation state
Ground state is moved to light.It is top emitting device that display base plate, which can exemplarily be set, and the negative electrode of organic illuminating element 14 is remote
The side of anode is the emission side of display base plate, i.e., the second electrode 142 in organic illuminating element 14 is away from first electrode 141
Side is the emission side of display base plate, then the first electrode 141 that can set organic illuminating element 14 is metal electrode.
The electrode structure 301 of reflection light is multiplexed with using the first electrode 141 of organic illuminating element 14, can avoid from
The incident light in side of the second electrode 142 of organic illuminating element 14 away from first electrode 141 exposes to driving transistor 15
The degreeof tortuosity of the upper transfer characteristic curve for influenceing driving transistor 15, such as the second electrode 142 from organic illuminating element 14
Light in the incident external environment in side away from first electrode 141, or the light that organic illuminating element 14 is sent pass through
The reflected light or refraction light of micro-cavity structure between the first electrode 141 and second electrode 142 of organic illuminating element 14, are not increasing
On the basis of adding display base plate film layer structure, transfer characteristic curve and driving transistor after driving transistor compensation can be improved
Original transfer characteristic curve repeatability, improve organic electroluminescence display panel show the problem of uneven.
Exemplary, the first electrode 141 that display base plate is bottom emitting device, then organic illuminating element 14 can also be set
It is made up of light transmissive material, the electrode layer 30 that can be provided for reflection light is located at the place film layer of driving transistor 15 and organic hair
Film layer between the place film layer of first electrode 141 of optical element 14, as shown in figure 3, so the reflection of electrode layer 30 can be utilized to have
The light that machine light-emitting component 14 is sent, this some light is avoided to expose in driving transistor the transfer spy for influenceing driving transistor
The degreeof tortuosity of linearity curve, the problem of uneven is shown to improve organic electroluminescence display panel.
Optionally, electrode layer 30 can also be arranged to driving transistor 15 close to the side of substrate 10, as shown in figure 4,
Electrode structure 301 in electrode layer 30 can then block the incident light in side of the substrate 10 away from driving transistor 15 and expose to
In driving transistor 15, such as equally can in external environment from light of the substrate 10 away from the incidence of the side of driving transistor 15
The repeatability of the original transfer characteristic curve of transfer characteristic curve and driving transistor after driving transistor compensation is improved, is improved
Organic electroluminescence display panel shows the problem of uneven.It is exemplary, the first electrode of organic illuminating element 14 can also be multiplexed
141 be electrode structure 301, for stopping second electrode 142 away from the incident light in the side of first electrode 141.
Optionally, electrode layer 30 can be set in side of the driving transistor 15 away from substrate 10, as shown in figure 3, so
Electrode layer 30 is capable of the light of side incidence of the reflection electrode layer 30 away from driving transistor 15, avoids this some light from irradiating
To driving transistor 15, the transfer characteristic curve of driving transistor 15 is influenceed.Can also be in driving transistor 15 away from substrate 10
Side and driving transistor 15 be respectively provided with electrode layer 30 close to the side of substrate 10, as shown in figure 5, so in electrode layer 30
Electrode structure 301 can either the incident light in side of the barrier electrode layer 30 away from driving transistor 15 expose to driving transistor
15, it can also block the incident light in side of the substrate 10 away from driving transistor 15 and expose to driving transistor 15, maximum journey
Influence of the light irradiation to the transfer characteristic curve of driving transistor is avoided on degree, is turned with improving after driving transistor compensation
The repeatability of characteristic curve and the original transfer characteristic curve of driving transistor is moved, it is uneven to improve organic electroluminescence display panel display
The problem of even.
Fig. 6 is the overlooking the structure diagram of another display base plate provided in an embodiment of the present invention.As shown in fig. 6, display
(Fig. 1 exemplarily represents one to multiple image element circuits 11 of the substrate including substrate 10 and on substrate 10 using a transistor
Image element circuit 11), display base plate can also include multi-strip scanning signal wire 12, a plurality of data signal line 13 on substrate 10
With multiple organic illuminating elements 14, image element circuit 11 and organic illuminating element 14 can be arranged at scan signal line 12 and believe with data
In the space of number 13 formation arranged in a crossed manner of line, scanning that image element circuit 11 can input in the scan signal line 12 being electrically connected
In the presence of signal, connection therewith correspond to electrical connection data signal line 13 and organic illuminating element 14, data signal line 13 to
Corresponding organic illuminating element 14 transmits data-signal, realizes the display function of display base plate according to this.
Fig. 7 is a kind of electrical block diagram of image element circuit provided in an embodiment of the present invention.As shown in fig. 7, pixel is electric
Road 11 includes the luminous control of driving transistor 15, Data write. module 16, memory module 17, threshold voltage compensation module 18, first
The light emitting control module 20 of molding block 19 and second, driving transistor 15 are organic to the offer driving current of organic illuminating element 14 Id
Light-emitting component 14 responds driving current Id and lighted, the driving transistor 15 that Data write. module 16 can write data-signal
Grid b1, memory module 17 electrically connect with the grid b1 of driving transistor 15, to maintain driving transistor 15 in glow phase
Grid b1 voltage.
Specifically, as shown in fig. 7, driving transistor 15 can receive data according to the connected state of Data write. module 16
The data-signal of signal input part Vdata inputs, driving current Id is provided to realize to organic illuminating element 14.
The control terminal a1 of Data write. module 16 electrically connects with the first scanning signal input Sn, and first end a2 believes with data
Number input Vdata electrical connection, the second end a3 electrically connect with the first end b2 of driving transistor 15, and Data write. module 16 can be with
Its first end a2 is controlled to be connected with the second end a3 according to the first scanning signal input Sn scanning signals inputted, by data-signal
Input Vdata input data signal transmission to driving transistor 15 first end b2.
The control terminal a1 of threshold voltage compensation module 18 electrically connects with the first scanning signal input Sn, and first end a2 is with driving
The second end b3 electrical connections of dynamic transistor 15, the second end a3 electrically connect with control terminal (grid) b1 of driving transistor 15, threshold value
Voltage compensation module 18 can control its first end a2 and second according to the first scanning signal input Sn scanning signals inputted
A3 connections are held, the control terminal b1 of driving transistor 15 is electrically connected with the second end b3 of driving transistor 15, i.e., threshold voltage is mended
The first end a2 for repaying module 18 is turned on the second end a3 so that driving transistor 15 forms the attachment structure of similar diode.
The control terminal a1 of first light emitting control module 19 electrically connects with enable signal input En, the electricity of first end a2 and first
Source signal input Vdd1 is electrically connected, and the second end a3 electrically connects with the first end b2 of driving transistor 15, the second light emitting control mould
The control terminal a1 of block 20 electrically connects with enable signal input En, and first end a2 and the second end b3 of driving transistor 15 are electrically connected
Connect, the second end a3 electrically connects with the first electrode 141 of organic illuminating element 14.First light emitting control module 19 and the second luminous control
Molding block 20 can enable signal input En input enable signal in the presence of control respectively respective first end a2 with
Second end a3 is connected so that the driving that the power supply signal of the first power supply signal input Vdd1 inputs is connected by similar diode
The light emitting control module 20 of transistor 15 and second is transmitted to the first electrode 141 of organic illuminating element 14.
The second electrode 142 of organic illuminating element 14 electrically connects with second source signal input part Vdd2, memory module 17
First end d1 electrically connected with the control terminal a1 of driving transistor 15, the second end d2 is electrically connected with the first power supply signal input Vdd1
Connect.
Optionally, as shown in fig. 7, the image element circuit 11 in display base plate can also include node reset module 21 and bypass
Module 22, the control terminal a1 of node reset module 21 electrically connect with the second scanning signal input Sn-1, first end a2 and reference
Voltage signal inputs Vinit is electrically connected, and the second end a3 electrically connects with the first end d1 of memory module 17, i.e. the second end a3 is with driving
The grid b1 electrical connections of dynamic transistor 15, the scanning that node reset module 21 can input in the second scanning signal input Sn-1
Its first end a2 is controlled to be connected with the second end a3 in the presence of signal so that the ginseng of reference voltage signal input Vinit inputs
Examine voltage signal and transmit the initialization behaviour to the grid b1 of driving transistor 15, realized to the grid b1 current potentials of driving transistor 15
Make.The control terminal a1 of bypass module 22 electrically connects with the second scanning signal input Sn-1, first end a2 and organic illuminating element
14 first electrode 141 electrically connects, and the second end a3 electrically connects with reference voltage signal input Vinit.
Fig. 8 is particular circuit configurations schematic diagram corresponding to image element circuit shown in Fig. 7.With reference to Fig. 7 and Fig. 8, node reset mould
Block 21 can include the first transistor T1, and bypass module 22 can include second transistor T2, and Data write. module 16 can wrap
Include third transistor T3, threshold voltage compensation module 18 can include the 4th transistor T4, and the first light emitting control module 19 can be with
Including the 5th transistor T5, the second light emitting control module 20 can include the 6th transistor T6, and memory module 17 can include the
One electric capacity C1.
The first transistor T1 grid b1 electrically connects with the second scanning signal input Sn-1, the first pole b2 and reference voltage
Signal input part Vinit is electrically connected, and the second pole b3 electrically connects with the first electric capacity C1 the first pole e1；Second transistor T2 grid
B1 electrically connects with the second scanning signal input Sn-1, and the first pole b2 electrically connects with reference voltage signal input Vinit, and second
Pole b3 electrically connects with the first electrode 141 of organic illuminating element 14；Third transistor T3 grid b1 and the first scanning signal are defeated
Enter to hold Sn to electrically connect, the first pole b2 electrically connects with data signal input Vdata, the second pole b3 and the first of driving transistor 15
Pole b2 is electrically connected；4th transistor T4 grid b1 electrically connects with the first scanning signal input Sn, and the first pole b2 is brilliant with driving
The second pole b3 electrical connections of body pipe 15, the second pole b3 electrically connect with the grid b1 of driving transistor 15；5th transistor T5 grid
Pole b1 electrically connects with enable signal input En, and the first pole b2 electrically connects with the first power supply signal input Vdd1, the second pole b3
Electrically connected with the first pole b2 of driving transistor 15；6th transistor T6 grid b1 electrically connects with enable signal input En,
First pole b2 electrically connects with the second pole b3 of driving transistor 15, the second pole b3 and organic illuminating element 14 first electrode 141
Electrical connection；First electric capacity C1 the first pole e1 electrically connects with the grid b1 of driving transistor 15, and the second pole e2 and the first power supply are believed
Number input Vdd1 electrical connection.
Fig. 9 is a kind of driver' s timing figure of image element circuit provided in an embodiment of the present invention.The first transistor T1 can be set
P-type transistor is illustrated in figure 7 to the 6th transistor T6 and driving transistor 15, the first transistor T1 can also be set extremely
6th transistor T6 and driving transistor 15 are N-type transistor, and the embodiment of the present invention is not construed as limiting to this, with reference to figure
7th, the operation principle of image element circuit is specifically described in 8 and 9 pairs of display base plates：
In t1 (initialization) periods, the first transistor T1 and second transistor T2 are in the second scanning signal input Sn-1
In the presence of the low level of input, connected between each self-corresponding first pole b2 and the second pole b3, third transistor T3 to the 6th
Transistor T6 is in the presence of the control signal that respective grid b1 is inputted, between each self-corresponding first pole b2 and the second pole b3
Shut-off.
In this case, the reference voltage signal of reference voltage signal input Vinit inputs passes through the first transistor
T1 is transmitted to the grid b1 of driving transistor 15, and driving transistor 15 is referenced voltage signal initialization.Likewise, reference voltage
The reference voltage signal of signal input part Vinit inputs is transmitted to the first electricity of organic illuminating element 14 by second transistor T2
Pole 141, organic illuminating element 14 are referenced voltage signal initialization.
In t2 (data write-in) period, the first transistor T1 and second transistor T2 in the second scanning signal input
Sn-1 input high level in the presence of, turned off between each self-corresponding first pole b2 and the second pole b3, third transistor T3 and
4th transistor T4 is in the presence of the low level that the first scanning signal input Sn is inputted, each self-corresponding first pole b2 and
Connected between two pole b3.
In this case, driving transistor 15 is equivalent into diode and forward bias by the 4th transistor T4.With
It is brilliant that the voltage of the data-signal of the data signal input Vdata inputs of three transistor T3 the first pole b2 electrical connections subtracts driving
The offset voltage obtained after the threshold voltage of body pipe 15 is applied to the grid b1 of driving transistor 15, now the first electric capacity C1
Magnitude of voltage on first pole e1 is equal to offset voltage, and the magnitude of voltage on the first electric capacity C1 the second pole e2 is equal to the first power supply signal
Voltage between the magnitude of voltage Vdd, the first electric capacity C1 of the power supply signal of input Vdd1 inputs the first pole e1 and the second pole e2
Electric charge corresponding to difference is stored in the first electric capacity C1.
In t3 (luminous) periods, the first transistor T1 and second transistor T2 are defeated in the second scanning signal input Sn-1
In the presence of the high level entered, turned off between each self-corresponding first pole b2 and the second pole b3, third transistor T3 and the 4th is brilliant
Body pipe T4 is in the presence of the high level that the first scanning signal input Sn is inputted, each self-corresponding first pole b2 and the second pole b3
Between turn off, the 5th transistor T5 and the 6th transistor T6 are in the presence of the low level that enable signal input En is inputted, respectively
Connected between self-corresponding first pole b2 and the second pole b3.
In this case, the power supply signal of the first power supply signal input Vdd1 inputs is transmitted by the 5th transistor T5
To the first pole b2 of driving transistor 15, the grid b1 voltages of driving transistor 15 are defeated with the first power supply signal input Vdd1's
Driving current Id flows to organic hair by the 6th transistor T6 caused by voltage difference between the magnitude of voltage Vdd of the power supply signal entered
Optical element 14, organic illuminating element 14 respond driving current Id and lighted.
In the t3 periods, the voltage Vgs between the grid b1 and source electrode (the first pole b2) of driving transistor 15 passes through first
Electric capacity C1 keeps or is kept substantially (Vdata+Vth)-Vdd, according to the driving current Id of driving transistor 15 and grid b1
The corresponding relation of voltage difference between source electrode (the first pole b2), the driving current Id and grid b1 and source electrode of driving transistor 15
Voltage Vgs between (the first pole b2) subtracts the threshold voltage vt h of driving transistor square (Vdata-Vdd)2It is proportional, because
The driving current Id of this driving transistor 15 is unrelated with the threshold voltage vt h of driving transistor 15, then the first electric capacity C1 is stored
Module 17 has grabbed the threshold voltage of driving transistor 15, and compensate for the threshold voltage of driving transistor 15 so that in t3
The driving current that (luminous) period flows through organic illuminating element 14 is unrelated with the threshold voltage of driving transistor 15.
In addition, in the t3 periods, works of the second transistor T2 in the second scanning signal input Sn-1 high level inputted
Turned off between its lower the first pole b2 and the second pole b3, the driving current Id come from the 6th transistor T6 transmission a part of conduct
By-pass current is realized by second transistor T2 and shunted.When display device shows black picture, even if driving transistor 15 is in
Minimum current caused by cut-off state flows through organic illuminating element 14, can not also ensure that display device correctly shows black picture.The
Two-transistor T2 setting enables to a part for minimum current caused by driving transistor 15 to be allocated as by-pass current
Current path in addition to the place current path of organic illuminating element 14 so that black picture can be more accurately displayed in display device
Face, to improve the contrast of display device.
It should be noted that the high level mentioned in above-described embodiment and low level are relative concept, the present invention is implemented
The size for the specific level value that example is included to high level with low level is not construed as limiting.In addition, the embodiment of the present invention is to pixel electricity
The quantity of transistor and the quantity of electric capacity are not construed as limiting in road, can be according to actual production demand to transistor in image element circuit
Quantity and the quantity of electric capacity are specifically set.
It should be noted that the embodiment of the present invention shows that accompanying drawing is exemplary to represent the big of each element and each film layer
It is small, do not represent the actual size of each element and each film layer in display panel.
The embodiment of the present invention makes electrode layer exist by setting at least one layer of electrode layer on substrate in display base plate
Upright projection of the upright projection covering driving transistor on substrate on substrate, and electrode layer can reflected illumination to electrode layer
On light, the light for exposing to driving transistor has been blocked using electrode layer, light has been effectively prevent and exposes to driving crystal
Pipe, the degreeof tortuosity of the transfer characteristic curve of driving transistor is reduced, improve the transfer characteristic after driving transistor compensation
The repeatability of curve and the original transfer characteristic curve of driving transistor, improve organic electroluminescence display panel show it is uneven
Problem.
The embodiment of the present invention additionally provides a kind of display device, and Figure 10 is a kind of display device provided in an embodiment of the present invention
Structural representation.As shown in Figure 10, display device 27 includes the display base plate 26 in above-described embodiment, therefore the present invention is implemented
The display device 27 that example provides also possesses the beneficial effect described by above-described embodiment, and here is omitted.Exemplary, display
Device 27 can be the electronic display units such as mobile phone, computer or television.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment here, can carry out various significantly change, again for a person skilled in the art
Adjustment and replacement are without departing from protection scope of the present invention.Therefore, although the present invention has been carried out by above example compared with
For detailed description, but the present invention is not limited only to above example, without departing from the inventive concept, can be with
Including other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (11)
- A kind of 1. display base plate, it is characterised in that including：Substrate；Multiple image element circuits on the substrate, each image element circuit include driving transistor and organic light emission member Part；The driving transistor is used to provide driving current to the organic illuminating element, and the organic illuminating element is used to respond The driving current lights；An at least electrode layer on the substrate, the upright projection of the electrode layer on the substrate cover the driving The upright projection of transistor on the substrate, for the light in reflected illumination to the electrode layer.
- 2. display base plate according to claim 1, it is characterised in thatThe electrode layer includes multiple electrodes structure；The upright projection covering of each electrode structure on the substrate is at least The upright projection of one driving transistor on the substrate.
- 3. display base plate according to claim 2, it is characterised in thatAlong the direction away from the substrate, each driving transistor includes active layer and grid, the active layer bag successively Include doped region and intrinsic region；The upright projection of the electrode structure on the substrate covers the doped region of the active layer on the substrate Upright projection.
- 4. display base plate according to claim 2, it is characterised in thatAlong the direction away from the substrate, each driving transistor includes active layer and grid successively；The border of the upright projection of the electrode structure on the substrate, the driving transistor with electrode structure covering The distance between the grid border of upright projection on the substrate be more than or equal to 3 μm.
- 5. display base plate according to claim 1, it is characterised in that the electrode layer is metal electrode layer.
- 6. display base plate according to claim 1, it is characterised in that side of the driving transistor away from the substrate And/or the driving transistor is provided with the electrode layer close to the side of the substrate.
- 7. display base plate according to claim 1, it is characterised in thatAlong the direction away from the substrate, the organic illuminating element includes first electrode, second electrode and positioned at described successively Light emitting functional layer between first electrode and the second electrode；The first electrode of each organic illuminating element electrically connects with corresponding driving transistor；The electrode layer includes multiple electrodes structure, and the first electrode of the organic illuminating element is multiplexed with the electrode knot Structure.
- 8. display base plate according to claim 1, it is characterised in that the image element circuit also includes：Data write. module, threshold voltage compensation module, the first light emitting control module, the second light emitting control module and storage mould Block；The control terminal of the Data write. module electrically connects with the first scanning signal input, first end and data signal input Electrical connection, the second end electrically connects with the first end of the driving transistor；The control terminal of the threshold voltage compensation module electrically connects with the first scanning signal input, first end and the drive The second end electrical connection of dynamic transistor, second end electrically connects with the control terminal of the driving transistor；The control terminal of the first light emitting control module electrically connects with enable signal input, and first end and the first power supply signal are defeated Enter end electrical connection, the second end electrically connects with the first end of the driving transistor；The control terminal of the second light emitting control module electrically connects with the enable signal input, and first end and the driving are brilliant The second end electrical connection of body pipe, the second end electrically connects with the first electrode of the organic illuminating element；The second electrode of the organic illuminating element electrically connects with second source signal input part；The first end of the memory module is electrically connected with the control terminal of the driving transistor, and the second end is believed with first power supply The electrical connection of number input, for capturing the threshold voltage of the driving transistor, and compensate the threshold value electricity of the driving transistor Pressure, make glow phase flow through the driving current of the organic illuminating element and the threshold voltage of the driving transistor without Close.
- 9. display base plate according to claim 8, it is characterised in that the image element circuit also includes：Node reset module and bypass module；The control terminal of the node reset module electrically connects with the second scanning signal input, and first end is defeated with reference voltage signal Enter end electrical connection, the second end electrically connects with the first end of the memory module；The control terminal of the bypass module electrically connects with the second scanning signal input, first end and organic light emission member The first electrode electrical connection of part, the second end electrically connects with the reference voltage signal input.
- 10. display base plate according to claim 9, it is characterised in that the node reset module includes the first transistor, The bypass module includes second transistor, and the Data write. module includes third transistor, the threshold voltage compensation mould Block includes the 4th transistor, and the first light emitting control module includes the 5th transistor, and the second light emitting control module includes 6th transistor, the memory module include the first electric capacity；The grid of the first transistor is electrically connected with the first scanning signal input, and the first pole is believed with the reference voltage The electrical connection of number input, the second pole electrically connects with the first pole of first electric capacity；The grid of the second transistor is electrically connected with the first scanning signal input, and the first pole is believed with the reference voltage The electrical connection of number input, the second pole electrically connects with the first electrode of the organic illuminating element；The grid of the third transistor electrically connects with the second scanning signal input, and the first pole and the data-signal are defeated Enter end electrical connection, the second pole electrically connects with the first pole of the driving transistor；The grid of 4th transistor electrically connects with the first scanning signal input, the first pole and the driving transistor The second pole electrical connection, the second pole electrically connects with the grid of the driving transistor；The grid of 5th transistor electrically connects with the enable signal input, and the first pole and first power supply signal are defeated Enter end electrical connection, the second pole electrically connects with the first pole of the driving transistor；The grid of 6th transistor electrically connects with the enable signal input, and the of the first pole and the driving transistor Two poles electrically connect, and the second pole electrically connects with the first electrode of the organic illuminating element；First pole of first electric capacity electrically connects with the grid of the driving transistor, the second pole and first power supply signal Input electrically connects.
- 11. a kind of display device, it is characterised in that including the display base plate described in claim any one of 1-10.
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| CN109301088A (en) * | 2018-10-23 | 2019-02-01 | 昆山国显光电有限公司 | A kind of organic light emitting display panel and organic light-emitting display device |
| CN112885763A (en) * | 2021-02-04 | 2021-06-01 | 深圳市汇川技术股份有限公司 | Transistor positioning device, power device and motor control device |
| WO2021238486A1 (en) * | 2020-05-29 | 2021-12-02 | 京东方科技集团股份有限公司 | Display substrate and display device |
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| CN107492567B (en) | 2020-06-02 |
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Effective date of registration: 20211103 Address after: No.8, liufangyuan Henglu, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: WUHAN TIANMA MICROELECTRONICS Co.,Ltd. Address before: Room 509, building 1, No. 6111, Longdong Avenue, Pudong New Area, Shanghai, 200120 Patentee before: SHANGHAI TIANMA AM-OLED Co.,Ltd. |