CN208488960U - Pixel circuit, display panel, display device - Google Patents
Pixel circuit, display panel, display device Download PDFInfo
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- CN208488960U CN208488960U CN201820449901.2U CN201820449901U CN208488960U CN 208488960 U CN208488960 U CN 208488960U CN 201820449901 U CN201820449901 U CN 201820449901U CN 208488960 U CN208488960 U CN 208488960U
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Abstract
The utility model provides a kind of pixel circuit, display panel, display device, and the pixel circuit includes: illuminating circuit, is arranged in each light emitting pixel area, including pixel driver end and turntable driving end；Data drive circuit is connect with the pixel driver end of the illuminating circuit；Scan drive circuit；It is connect with the turntable driving end of the illuminating circuit；Overcurrent-overvoltage protecting circuit is provided between the scan drive circuit and the turntable driving end of the illuminating circuit.Pixel circuit provided by the utility model; cut-off in advance to reverse biased current is realized by being provided with overcurrent-overvoltage protecting circuit between the scan drive circuit and the turntable driving end of the illuminating circuit; it avoids being superimposed out high voltage, high current in OLED device; so that pull-down current is smaller at OLED device; it is not easy breakdown; reduce the not bright spot probability of happening due to caused by OLED device reverse breakdown, effectively raises Showing Effectiveness On Screen.
Description
Technical field
The utility model relates to mobile terminals to show equipment technical field, and in particular to a kind of pixel circuit, display panel,
Display device.
Background technique
Organic light emitting display (Organic Light-Emitting Diode, OLED) is current flat-panel monitor research
One of the hot spot in field, compared with liquid crystal display, OLED has low low energy consumption, production cost, self-luminous, wide viewing angle and response
The advantages that speed is fast is widely used in display fields such as mobile phone, PDA, digital cameras at present.
Existing OLED display screen pixel circuit as shown in Figure 1, the OLED diode 11 in pixel region cathode and sun
Pole both ends are separately connected scan drive circuit 1 and data drive circuit 2, cathode and the turntable driving electricity of the OLED diode
Road connection, the anode of the OLED diode are connect with the data drive circuit.Foregoing circuit connection type, in reverse bias
Voltage pressurizes moment, in fact it could happen that reverse bias voltage is superimposed with what capacitor 9 energy storage in OLED diode both ends was discharged, is generated
The up to voltage of 20V or more makes there are reversed high current at OLED device, and pixel is breakdown, and presentation is resistive, causes punch through
Pixel is not bright spot in the state of display, and highlighted state is presented in breakdown pixel column.
Summary of the invention
The purpose of the utility model is to provide one kind can be avoided pixel region OLED diode in load reverse bias electricity
Breakdown pixel circuit when pressure.
In order to achieve the above object, in a first aspect, the utility model provides a kind of pixel circuit, comprising:
Illuminating circuit is arranged in each light emitting pixel area, including pixel driver end and turntable driving end；
Data drive circuit is connect with the pixel driver end of the illuminating circuit；
Scan drive circuit；It is connect with the turntable driving end of the illuminating circuit；
Over-current over-voltage protection electricity is provided between the scan drive circuit and the turntable driving end of the illuminating circuit
Road.
Preferably, the overcurrent-overvoltage protecting circuit includes at least one diode, and the cathode of the diode connects institute
Scan drive circuit is stated, the anode of the diode connects the illuminating circuit.
Preferably, the over-current over-voltage protection unit includes multiple diodes.
Preferably, the multiple diode be separately positioned on each illuminating circuit turntable driving end and the turntable driving
Between circuit.
Preferably, the multiple diode is to be connected in series, and the multiple diode is arranged in multiple luminous electricity
Between the turntable driving end and the scan drive circuit on road.
Preferably, the scan drive circuit includes the driving chip connecting with the diode, the data-driven electricity
Road includes the driving chip connecting with the pixel driver end.
Preferably, the illuminating circuit includes OLED, wherein the cathode of the OLED connects the anode of the diode, institute
The anode for stating OLED connects the data drive circuit.
Preferably, the over-current over-voltage protection unit further includes the resistance of at least one and the Diode series.
Second aspect, the present invention also provides a kind of display panels, including pixel circuit described in any of the above embodiments.
The third aspect, the present invention also provides a kind of display devices, including display panel described above.
Pixel circuit provided by the invention, between the scan drive circuit and the turntable driving end of the illuminating circuit
It is provided with overcurrent-overvoltage protecting circuit, reverse biased current has been ended by the overcurrent-overvoltage protecting circuit in advance, has been avoided
High voltage, high current are superimposed out in OLED device so that pull-down current is smaller at OLED device, be not easy it is breakdown, reduce due to
Not bright spot probability of happening caused by OLED device reverse breakdown.Further, it is driven by the scanning respectively to each illuminating circuit
Overcurrent-overvoltage protecting circuit is respectively provided between moved end and scan drive circuit, can be separately protected to the progress of each illuminating circuit,
If there is not bright spot, the phenomenon that bright line will not be showed, it is only limited to be a not bright spot, in screen body use process, vision
Influence is smaller, effectively raises Showing Effectiveness On Screen.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the particular circuit configurations schematic diagram of pixel circuit in the prior art；
Fig. 2 is the modular structure schematic diagram for the pixel circuit that the utility model embodiment one provides；
Fig. 3 is the electrical block diagram for the pixel circuit that the utility model embodiment one provides.
Fig. 4 is the electrical block diagram for another pixel circuit that the utility model embodiment one provides.
Fig. 5 is the electrical block diagram for the pixel circuit that the utility model embodiment two provides.
Fig. 6 is the electrical block diagram for the pixel circuit that the utility model embodiment three provides.
Fig. 7 is the electrical block diagram for the pixel circuit that the utility model embodiment four provides.
Specific embodiment
Below in conjunction with drawings and examples, technical solution of the present invention is clearly and completely described, it is clear that institute
The embodiment of description is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ability
Domain those of ordinary skill every other embodiment obtained without making creative work, belongs to guarantor of the present invention
The range of shield.
Embodiment one
The embodiment of the present invention one provides a kind of pixel circuit, and as shown in attached drawing 2, Fig. 3, Fig. 2 is that the utility model is implemented
The modular structure schematic diagram for the pixel circuit that example provides.The pixel circuit includes: scan drive circuit 1, data drive circuit
2, the illuminating circuit 4 and overcurrent-overvoltage protecting circuit 5 on the light emitting region OLED 3.
Wherein, each illuminating circuit corresponds to a light emitting pixel region in the light emitting region OLED, the hair
Optical circuit includes light emitting diode 12 and capacitor 11, and the anode of light emitting diode is pixel driver end, the cathode of light emitting diode
For turntable driving end.The pixel driver end of the illuminating circuit is connect by several data line DL with the data drive circuit,
It is provided between the turntable driving end and the scan drive circuit of the illuminating circuit for ending reverse biased current in advance
Overcurrent-overvoltage protecting circuit.
Specifically, the overcurrent-overvoltage protecting circuit can be diode, as shown in Fig. 3.Attached drawing 3 is that this is practical new
The electrical block diagram for the pixel circuit that type embodiment provides, in order to make it easy to understand, attached drawing 3 is only schematically drawn a hair
Optical circuit, the illuminating circuit include an OLED 12 and positioned at 12 both ends OLED and column capacitance 11, the OLED's
Cathode connects the anode of diode 5, and the anode of the OLED connects the data drive circuit 2.The data drive circuit 2 wraps
The driving chip connecting with the pixel driver end of the illuminating circuit is included, the specific structure of the driving chip includes a driving
9, reset transistors 10 of transistor, the grid of the driving transistor 9 connect driving signal, the leakage of the driving transistor
Pole is connected to power supply V by a constant-current source deviceCC, the source electrode of the reset transistor 10 connects earthing power supply VLSS, the drive
The drain electrode of the source electrode, the reset transistor 10 of dynamic transistor 9 is connect with the anode of the OLED.The scanning circuit 1 includes
The driving chip connecting with the diode, the driving chip include 7, non-selection row crystal of a row selecting transistor
Pipe 6, the row selecting transistor source electrode ground connection, non-selection 6 drain electrode end of row transistor connect high electrode VCOMH, the row choosing
The drain electrode end for selecting transistor connect the cathode of the diode 5, row selection crystal with the source terminal of the non-selection row transistor
The driving end of pipe 7 connects row signal line, and the driving end of non-selection row transistor 6 connects column signal line.
Further, the diode can also connect at least one resistance, as shown in figure 4, series resistance 51, passes through
Resistance 51 divides current limliting to scanning circuit further progress, to avoid occurring reverse bias voltage current signal in scanning circuit
It is excessive, protect pixel.
Due to backward dioded of having connected between the OLED and the scanning circuit, direction diode is typically chosen
Zener diode, since the function of diode is forward conduction, reversely by therefore when reverse bias voltage occur, in advance
Reverse current is ended, when reverse bias voltage is excessive, which may also be reversed breakdown, when backward voltage reaches one
When fixed number value, reverse current increases suddenly, and zener diode enters breakdown region, even if reverse current becomes in very large range at this time
When change, the backward voltage at zener diode both ends, which is also able to maintain, to be basically unchanged, high so as to avoid being superimposed out in OLED device
Voltage, high current, protect pixel, reduce due to caused by OLED device reverse breakdown not bright spot probability of happening.Diode
After breakdown, as long as voltage is no more than limiting value, damaged after will not thoroughly being punctured, at this time when current reverts are normally positive
When electric current, diode still be can work normally.
Embodiment 2:
In the utility model second embodiment, the diode can be a diode and more than two pixel regions
The illuminating circuit in domain connects, as shown in figure 5, the overcurrent-overvoltage protecting circuit 5 includes a diode 5a, the illuminating circuit
It include three OLED 12a-12c, and capacitor 11a-11c in parallel with three OLED respectively in 4.Wherein, two pole
The cathode of pipe is connect with the scanning circuit 1, and the anode of the diode connects with the cathode of three OLED in illuminating circuit 4 respectively
It connects, the anode of the OLED connects the data drive circuit 2, can be achieved at the same time to multiple OLED's by a diode
Protection, when there is high back voltage, by the reversed cut-off of the diode, has ended backward voltage in advance, has avoided being connected thereto
Multiple OLED on be superimposed out high voltage, high current, avoid OLED be reversed breakdown without show, improve display effect.
Embodiment 3:
In the utility model third embodiment, multiple concatenated diodes are also can be set into the diode, such as
It include two concatenated diode 5a and 5b in the overcurrent-overvoltage protecting circuit shown in attached drawing 6, the illuminating circuit includes 4
It inside include three OLED 12a-12c, and capacitor 11a-11c in parallel with three OLED respectively.Wherein, two pole
The cathode of pipe 5a is connect with the scanning circuit 1, and OLED 12a-12c's is negative in the anode and illuminating circuit 4 of the diode 5b
Pole connection, the anode of the OLED 12a-12c are all connected with the data drive circuit 2.By OLED and scanning circuit it
Between multiple concatenated backward diodeds are set, by multiple series opposing diodes, can be improved to backward voltage cut-off effect
Fruit guarantees not punctured thoroughly under big voltage, guarantees that electric current recovery astern still can work normally, further increases pair
OLED avoids the protection of reverse breakdown, improves display effect.
Embodiment 4
In the 4th embodiment of the utility model, non-cascade is also can be set into the multiple diode, but
Each diode is separately positioned between the turntable driving end of each illuminating circuit and the scan drive circuit.Such as 7 institute of attached drawing
Show, include three diode 5a-5c in the overcurrent-overvoltage protecting circuit, the illuminating circuit includes in 4 including three OLED
12a-12c, and capacitor 11a-11c in parallel with three OLED respectively.Wherein, the cathode of the diode 5a-5c is equal
It is connect with the scanning circuit 1, the positive cathode with OLED 12a-12c in illuminating circuit 4 respectively of the diode 5a-5c
Connection, the anode of the OLED 12a-12c are all connected with the data drive circuit 2.Pass through the scanning drive in each illuminating circuit
The diode is separately provided between moved end and the scanning circuit, the multiple diode is equivalent to parallel connection, and described every
A illuminating circuit corresponds, so that realization is separately protected to the progress of each OLED diode, so that if there is not bright spot,
The phenomenon that bright line will not be showed, is only limited to be a not bright spot, and in screen body use process, visual impact is smaller, effectively
Improve Showing Effectiveness On Screen.
The illuminating circuit of the multiple diode and multiple pixel regions, the i.e. cathode of OLED can also be there are many connection sides
Formula can be multiple diodes in parallel and then connect its anode with the cathode of all OLED, and being also possible to will be multiple
Diode divides several groups of parallel connections and then respectively by the cathode of group and different OLED connection etc..
Embodiment 5
Originally it applies example and a kind of display panel is provided, including pixel circuit and display module described above, the pixel circuit
For protecting the pixel of the display module to be punctured by high back voltage.The display panel is reduced since OLED device is reversely hit
Not bright spot probability of happening caused by wearing, improves display effect, if there is not bright spot, the phenomenon that bright line will not be showed,
It is only limited to be a not bright spot, in screen body use process, visual impact is smaller.
Embodiment 6
A kind of display device is additionally provided in the present embodiment, as television set, Vehicular display device, AR, VR, computer monitor,
The operating display etc. of controller, including display panel described above.The display device is not in tool the phenomenon that exposing
There is better display effect.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of pixel circuit, comprising:
Illuminating circuit is arranged in each light emitting pixel area, including pixel driver end and turntable driving end；
Data drive circuit is connect with the pixel driver end of the illuminating circuit；
Scan drive circuit；It is connect with the turntable driving end of the illuminating circuit；
It is characterized in that, being provided with overcurrent-overvoltage between the scan drive circuit and the turntable driving end of the illuminating circuit
Protect circuit.
2. pixel circuit as described in claim 1, it is characterised in that: the overcurrent-overvoltage protecting circuit include at least one two
Pole pipe, the cathode of the diode connect the scan drive circuit, and the anode of the diode connects the illuminating circuit.
3. pixel circuit as claimed in claim 2, it is characterised in that: the over-current over-voltage protection unit includes multiple two poles
Pipe.
4. pixel circuit as claimed in claim 3, it is characterised in that: the multiple diode is separately positioned on each luminous electricity
Between the turntable driving end and the scan drive circuit on road.
5. pixel circuit as claimed in claim 3, it is characterised in that: the multiple diode is series connection, and described more
A diode is arranged between the turntable driving end and the scan drive circuit of multiple illuminating circuits.
6. the pixel circuit as described in any one of claim 2-5, it is characterised in that: the scan drive circuit include with
The driving chip of the diode connection, the data drive circuit includes the driving chip connecting with the pixel driver end.
7. such as the described in any item pixel circuits of claim 2-5, it is characterised in that: the illuminating circuit includes OLED, wherein
The cathode of the OLED connects the anode of the diode, and the anode of the OLED connects the data drive circuit.
8. the pixel circuit as described in claim 2-5 any one, it is characterised in that: the over-current over-voltage protection unit also wraps
Include the resistance of at least one and the Diode series.
9. a kind of includes the display panel such as the described in any item pixel circuits of claim 1-8.
10. a kind of display device, which is characterized in that including display panel as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820449901.2U CN208488960U (en) | 2018-03-31 | 2018-03-31 | Pixel circuit, display panel, display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820449901.2U CN208488960U (en) | 2018-03-31 | 2018-03-31 | Pixel circuit, display panel, display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208488960U true CN208488960U (en) | 2019-02-12 |
Family
ID=65255158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820449901.2U Active CN208488960U (en) | 2018-03-31 | 2018-03-31 | Pixel circuit, display panel, display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208488960U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112562600A (en) * | 2020-12-01 | 2021-03-26 | Tcl华星光电技术有限公司 | Display device and driving method thereof |
| CN113035116A (en) * | 2021-03-02 | 2021-06-25 | Tcl华星光电技术有限公司 | Drive circuit and display device |
-
2018
- 2018-03-31 CN CN201820449901.2U patent/CN208488960U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112562600A (en) * | 2020-12-01 | 2021-03-26 | Tcl华星光电技术有限公司 | Display device and driving method thereof |
| US11847985B2 (en) | 2020-12-01 | 2023-12-19 | Tcl China Star Optoelectronics Technology Co., Ltd. | Display device and driving method thereof |
| CN113035116A (en) * | 2021-03-02 | 2021-06-25 | Tcl华星光电技术有限公司 | Drive circuit and display device |
| US11735102B2 (en) | 2021-03-02 | 2023-08-22 | Tcl China Star Optoelectronics Technology Co., Ltd. | Driving circuit and display device |
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