CN218004377U - OLED display panel and OLED aging detection circuit - Google Patents
OLED display panel and OLED aging detection circuit Download PDFInfo
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- CN218004377U CN218004377U CN202222094568.7U CN202222094568U CN218004377U CN 218004377 U CN218004377 U CN 218004377U CN 202222094568 U CN202222094568 U CN 202222094568U CN 218004377 U CN218004377 U CN 218004377U
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Abstract
The utility model discloses an ageing detection circuit and OLED display panel for OLED display panel, OLED display panel include a plurality of matrix arrangement's pixel unit, and every pixel unit includes organic light emitting diode, and ageing detection circuit includes: the first aging controller is used for outputting a detection signal in an aging detection stage; the control end of each detection transistor is connected to the first aging controller, and the second conduction end of each detection transistor is connected to the anode of the corresponding organic light emitting diode; the second aging controller is connected to the first conduction end of the detection transistor through an aging detection line and used for reading the anode voltage of the organic light-emitting diode and outputting a corresponding data voltage value according to the anode voltage; and each row of pixel units corresponds to one reset transistor, and the first conduction end of each reset transistor is connected to the first conduction end of the corresponding row of detection transistors through the aging detection line and is used for resetting the aging detection line, so that the display effect of the OLED display panel is improved.
Description
Technical Field
The utility model relates to a show technical field, in particular to OLED display panel and OLED ageing detection circuit.
Background
The OLED display panel displays images by using Organic Light Emitting Diodes (OLEDs), is an active light Emitting display panel, has a display mode different from that of a conventional tft-lcd panel, does not need a backlight, and has many advantages of high contrast, fast response speed, light weight, and the like.
Generally, each pixel unit of the OLED display panel includes an organic light emitting diode OLED and a pixel driving circuit for driving the organic light emitting diode OLED to emit light. After long-term use, the organic light emitting diode OLED is in an aging state due to the relation of process materials, so that the luminance of the pixel is continuously attenuated, and the attenuation speed of the luminance of the pixel is different due to the fact that the materials of the organic light emitting diode OLED used by a plurality of sub-pixels of each pixel are different, and the display panel has the problem of poor display uniformity and the like.
In the prior art, the aging data of the organic light emitting diode OLED is generally collected by calculating aging factors such as accumulated light emitting time and light emitting intensity. Therefore, an OLED aging detection method for directly detecting the aging characteristics of the organic light emitting diode is yet to be provided.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide an OLED display panel and an OLED aging detection circuit, so as to improve the display effect of the OLED display panel.
According to an aspect of the present invention, there is provided an OLED display panel including a plurality of matrix-arranged pixel units, each of the pixel units including an organic light emitting diode, the aging detection circuit including: the first aging controller is used for outputting a detection signal in an aging detection stage; a plurality of detection transistors, wherein control terminals of the detection transistors are connected to the first aging controller, and second conduction terminals of the detection transistors are connected to anodes of the corresponding organic light emitting diodes; the second aging controller is connected to the first conduction end of the detection transistor through an aging detection line and used for reading the anode voltage of the organic light-emitting diode and outputting a corresponding data voltage value according to the anode voltage; the pixel units of each column correspond to one reset transistor, and the first conduction ends of the reset transistors are connected to the first conduction ends of the detection transistors of the corresponding column through the aging detection line and are used for resetting the aging detection line.
Optionally, the reset transistor is located outside the pixel cell.
Optionally, a plurality of the detection transistors are set to be turned on in the aging detection stage.
Optionally, the second aging controller includes a storage module, configured to read anode voltages of a plurality of the organic light emitting diodes and store the anode voltages of the respective plurality of the organic light emitting diodes; and the compensation module is connected with the storage module and used for outputting corresponding data voltage values according to the anode voltages of the organic light emitting diodes.
Optionally, a mapping table of anode voltage values and data voltage values is pre-stored in the compensation module, and the compensation module searches and outputs the corresponding data voltage value according to the respective anode voltages of the plurality of organic light emitting diodes.
Optionally, the pixel unit further includes a pixel driving circuit for driving the organic light emitting diode to emit light.
Optionally, the aging detection circuit further includes a data voltage input module, connected to the compensation module, and configured to output a corresponding data voltage according to the data voltage value of the organic light emitting diode and transmit the data voltage to the corresponding pixel driving circuit through a data line.
Optionally, the data lines are time-division multiplexed into data lines and aging detection lines, the data lines are used as data lines in a normal display stage, and the data lines are used as aging detection lines in an aging detection stage.
Optionally, the aging detection circuit further includes a plurality of operational amplifiers, the operational amplifiers correspond to the reset transistors one to one, a positive input terminal of each operational amplifier is connected to the data voltage input module, and a negative input terminal and an output terminal of each operational amplifier are connected to the second conduction terminals of the detection transistors in the corresponding row and the first conduction terminals of the reset transistors.
According to another aspect of the present invention, there is provided an OLED display panel, including the above aging detection circuit.
According to the utility model discloses the ageing detection circuit of OLED display panel and OLED that provides, through timesharing multiplex data line, make the data line read every OLED's anode voltage in ageing detection stage in order to carry out ageing compensation to every OLED according to every OLED's anode voltage pertinence, thereby make OLED display panel can evenly display the picture when practicing thrift the wiring; and the OLED display panel can display images with higher density by sharing one reset transistor for each column of pixel units.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a schematic structural diagram of an OLED display panel according to a first embodiment of the present invention;
fig. 2 shows a schematic structural diagram of an OLED display panel according to a second embodiment of the present invention;
fig. 3 shows a flowchart of an aging detection method according to an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In the various figures, the same elements or modules are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
It should be understood that in the following description, "circuitry" may comprise singly or in combination hardware circuitry, programmable circuitry, state machine circuitry, and/or elements capable of storing instructions executed by programmable circuitry. When an element or circuit is referred to as being "connected to" another element or circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Moreover, it is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Fig. 1 is a schematic structural diagram of an OLED display panel according to a first embodiment of the present invention, and the OLED display panel shown in fig. 1 includes a plurality of pixel units 10 arranged in a matrix, a scan controller 20, a first aging controller 30, a second aging controller 40, and a data voltage input module 60.
Fig. 1 exemplarily shows only eight pixel units 10 arranged in two rows and four columns, but the number of pixel units 10 is not limited to eight, and the number of pixel units 10 and the shape of the matrix may be adjusted according to practical situations. The first row of pixel units 10 may be set as dummy pixel units to improve the display effect, and the dummy pixel units do not need to be aged and detected, and certainly, the dummy pixel units may not be set.
Each pixel cell 10 includes a pixel driving circuit 110, a detection transistor T2, and an organic light emitting diode OLED, the cathode of which is connected to a common voltage VCOM (not shown in the figure).
It should be noted that, the present invention does not specifically limit the circuit structure of the pixel driving circuit 110, and any circuit structure can be adopted, and only the organic light emitting diode OLED needs to be driven to emit light. This embodiment takes a 2T1C type pixel driving circuit as an example.
As shown in fig. 1, each pixel driving circuit 110 includes a scanning transistor T1, a driving transistor T3, and a storage capacitor C. A first conduction terminal of the scan transistor T1 is connected to the second aging controller 40 through a data line, a second conduction terminal is connected to the control terminal of the driving transistor T3, and the control terminal is connected to the scan controller 20; the second conducting end of the driving transistor T3 is connected to the anode of the organic light emitting diode OLED; a storage capacitor C is provided between the ground terminal GND and the intermediate node a of the scan transistor T1 and the drive transistor T3.
The pixel driving circuit 110 is configured to drive the organic light emitting diode OLED to emit light, and specifically, the scan transistor T1 of the pixel driving circuit 110 receives a scan signal provided by the scan controller 20 and a data voltage VDATA provided by the data voltage input module 60 through a data line, and controls the driving transistor T3 to drive the organic light emitting diode OLED to emit light according to the scan signal and the data voltage VDATA.
The utility model provides an ageing detection circuit for OLED display panel's organic light emitting diode OLED includes a plurality of detection transistor T2, first ageing controller 30, the ageing controller 40 of second and data voltage input module 60. The aging detection circuit is used for reading the anode voltage of the organic light emitting diode OLED in a light emitting state and carrying out aging compensation on the organic light emitting diode OLED according to the anode voltage of the organic light emitting diode OLED.
A control terminal of each of the sensing transistors T2 is connected to the first aging controller 30, a first conduction terminal is connected to the second aging controller 40 through a corresponding aging detection line, and a second conduction terminal is connected to the driving transistor T3 and the intermediate node B of the organic light emitting diode OLED.
The first aging controller 30 is used for outputting a detection signal to the control terminal of each detection transistor T2 during the aging detection stage of the OLED display panel to control the aging detection circuit to be turned on or turned off.
The second aging controller 40 is configured to read the anode voltage of the organic light emitting diode OLED through the aging detection line at the OLED aging detection stage of the OLED display panel, and perform aging compensation on the organic light emitting diode OLED according to the anode voltage.
The second aging controller 40 includes a memory module 41 and a compensation module 42 electrically connected to the memory module 41, wherein the memory module 41 is configured to read and store the anode voltage of each organic light emitting diode OLED in an aging detection stage; the compensation module 42 stores a mapping table of anode voltage values and data voltage values in advance, and is configured to search for a data voltage value corresponding to the anode voltage value of each organic light emitting diode OLED according to the mapping table, output each organic light emitting diode OLED and the data voltage value corresponding thereto to the data voltage input module 60, and output a corresponding data voltage VDATA by the data voltage input module 60 and transmit the data voltage VDATA to the corresponding pixel driving voltage 110 through a data line.
The aging detection circuit further comprises a reset transistor T4, a first conduction end of the reset transistor T4 is connected to a first conduction end of the detection transistor T2 in a corresponding row through an aging detection line, a second conduction end of the reset transistor T4 is grounded, and the control end of the reset transistor T4 is used for receiving a reset signal. The reset transistor T4 is used for resetting the aging detection line according to the reset signal, thereby facilitating the aging detection line to read the anode voltage of the organic light emitting diode OLED next time.
As shown in fig. 1, the reset transistor T4 is located outside the plurality of pixel units 10, each column of pixel units 10 shares one reset transistor, and PPI characteristics can be effectively considered by sharing one reset transistor T4 by each column of pixel units 10, so that the OLED display panel can display images with higher density.
Furthermore, the data lines are multiplexed into the data lines or the aging detection lines in a time-sharing manner, and specifically, the data lines are used as the data lines in the normal display stage of the OLED display panel, and the aging detection lines are used as the aging detection lines in the aging detection stage of the OLED display panel.
Although fig. 1 only shows an embodiment in which the data lines are time-division multiplexed into the data lines or the aging detection lines, it is understood that the method in which each column of pixel cells 10 shares one reset transistor T4 may also be applied to an embodiment in which the data lines and the aging detection lines are different lines.
According to the embodiment of the utility model provides an ageing detection circuit of OLED utilizes existing circuit framework, the multiplexing data line of timesharing for the data line reads every organic light emitting diode OLED's anode voltage in ageing detection stage and carries out ageing compensation to every organic light emitting diode OLED according to every organic light emitting diode OLED's anode voltage pertinence, thereby makes OLED display panel evenly show the picture when practicing thrift the wiring; and the OLED display panel can display images at higher density by sharing one reset transistor T4 per column of pixel units 40.
Fig. 2 shows a schematic structural diagram of an OLED display panel according to a second embodiment of the present invention, and an aging detection circuit according to the second embodiment of the present invention is substantially the same as the aging detection circuit according to the first embodiment of the present invention, and only the difference between the two is described below.
The OLED display panel further includes a plurality of operational amplifiers 50, the operational amplifiers 50 are in one-to-one correspondence with the reset transistors T4, a positive input terminal of each operational amplifier 50 is connected to the data voltage input module 60, a negative input terminal and an output terminal of the operational amplifier 50 are connected to serve as voltage followers, an output terminal of each operational amplifier 50 is connected to the first conduction terminal of the corresponding reset transistor T4, and an output terminal of each operational amplifier 50 is further connected to the storage module 41 of the second aging controller 40.
According to the utility model provides an ageing detection circuit of OLED, through operational amplifier 50 transmission voltage signal, can guarantee voltage signal's stable output.
In order to better understand the utility model provides an ageing detection circuit of OLED, the utility model also provides an ageing detection method, as shown in FIG. 3 this method includes following step:
s1: the pixel driving circuit 110 drives the organic light emitting diode OLED to emit light according to the data voltage VDATA and the scan signal;
s2: the first aging controller 30 outputs a detection signal to the control terminal of the detection transistor T2 to turn on the aging detection circuit;
s3: the second aging controller 40 reads the anode voltage of each organic light emitting diode OLED to determine a data voltage value corresponding to each organic light emitting diode OLED.
S4: the data voltage input module 60 reads a data voltage value corresponding to each organic light emitting diode OLED and outputs a corresponding data voltage VDATA to the corresponding pixel driving circuit 110.
In accordance with the present invention, as set forth above, these embodiments do not set forth all of the details nor limit the invention to the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The scope of the present invention should be determined by the appended claims and their equivalents.
Claims (10)
1. An aging detection circuit for an OLED display panel, wherein the OLED display panel comprises a plurality of pixel units arranged in a matrix, each of the pixel units comprises an organic light emitting diode, the aging detection circuit comprising:
the first aging controller is used for outputting a detection signal in an aging detection stage;
a plurality of detection transistors, wherein control terminals of the detection transistors are connected to the first aging controller, and second conduction terminals of the detection transistors are connected to anodes of the corresponding organic light emitting diodes;
the second aging controller is connected to the first conduction end of the detection transistor through an aging detection line and used for reading the anode voltage of the organic light-emitting diode and outputting a corresponding data voltage value according to the anode voltage;
the pixel units of each column correspond to one reset transistor, and the first conduction ends of the reset transistors are connected to the first conduction ends of the detection transistors of the corresponding column through the aging detection line and are used for resetting the aging detection line.
2. The degradation detection circuit of claim 1, wherein the reset transistor is external to the pixel cell.
3. The degradation detection circuit of claim 1, wherein a plurality of the detection transistors are configured to turn on during the degradation detection phase.
4. The aging detection circuit of claim 1, wherein the second aging controller comprises:
the storage module is used for reading anode voltages of the organic light emitting diodes and storing the anode voltages of the organic light emitting diodes;
and the compensation module is connected with the storage module and used for outputting corresponding data voltage values according to the anode voltages of the organic light emitting diodes.
5. The aging detection circuit of claim 4, wherein the compensation module pre-stores a mapping table of anode voltage values and data voltage values, and the compensation module searches and outputs the corresponding data voltage values according to the anode voltages of the organic light emitting diodes.
6. The degradation detection circuit of claim 5, wherein the pixel unit further comprises:
and the pixel driving circuit is used for driving the organic light emitting diode to emit light.
7. The degradation detection circuit of claim 6, wherein the degradation detection circuit further comprises:
and the data voltage input module is connected with the compensation module and used for outputting corresponding data voltage according to the data voltage value of the organic light-emitting diode and transmitting the corresponding data voltage to the corresponding pixel driving circuit through a data line.
8. The aging detection circuit of claim 7, wherein the data lines are time-multiplexed into data lines and aging detection lines, the data lines being used as data lines during the normal display phase and as aging detection lines during the aging detection phase.
9. The degradation detection circuit of claim 7, further comprising:
the operational amplifiers are in one-to-one correspondence with the reset transistors, the positive input end of each operational amplifier is connected to the data voltage input module, and the negative input end and the output end of each operational amplifier are connected with the second conduction ends of the detection transistors in the corresponding row and the first conduction ends of the reset transistors.
10. An OLED display panel comprising the degradation detection circuit of any one of claims 1 to 9.
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| CN202222094568.7U CN218004377U (en) | 2022-08-09 | 2022-08-09 | OLED display panel and OLED aging detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116627759A (en) * | 2023-05-19 | 2023-08-22 | 北京神州安付科技股份有限公司 | Financial payment equipment circuit safety detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116627759A (en) * | 2023-05-19 | 2023-08-22 | 北京神州安付科技股份有限公司 | Financial payment equipment circuit safety detection device |
| CN116627759B (en) * | 2023-05-19 | 2024-02-27 | 北京神州安付科技股份有限公司 | Financial payment equipment circuit safety detection device |
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