CN110197842B - OLED bottom emission structure and driving method thereof - Google Patents
OLED bottom emission structure and driving method thereof Download PDFInfo
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- CN110197842B CN110197842B CN201910462092.8A CN201910462092A CN110197842B CN 110197842 B CN110197842 B CN 110197842B CN 201910462092 A CN201910462092 A CN 201910462092A CN 110197842 B CN110197842 B CN 110197842B
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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
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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
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
Abstract
The invention provides an OLED bottom emission structure and a driving method thereof. This OLED bottom emission structure is including setting up the display element on the basement and being located the peripheral non-display element of display element, the display element includes the positive pole, luminous functional layer and negative pole, non-display element includes pixel circuit, positive pole and pixel circuit all set up on the basement and lie in basement same one side, luminous functional layer and negative pole lie in the positive pole and deviate from one side of basement, and keep away from the positive pole setting in proper order, still include the optical compensation unit, the optical compensation unit sets up in the one side that deviates from the basement of display element, a luminous according to the display element carries out optical compensation to the display element. The OLED bottom emission structure can realize optical compensation, so that the complexity of the pixel circuit and the preparation process of the OLED bottom emission structure is reduced, the stability of the pixel circuit is ensured, the compensation accuracy and the compensation intelligence are improved, and the display effect of the OLED bottom emission structure is improved.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to an OLED bottom emission structure and a driving method thereof.
Background
The OLED bottom emission structure comprises a large number of switching tubes and driving tubes, and the switching tubes and the driving tubes have threshold voltage drift during working, so that normal display of the OLED bottom emission structure is seriously influenced.
At present, threshold voltage compensation is usually implemented by setting a threshold voltage compensation circuit to electrically compensate the threshold voltage of the OLED bottom emission structure in the display process, but the setting of the threshold voltage compensation circuit makes the OLED bottom emission structure manufacturing process complicated, and on the other hand, since the electrical compensation usually has deviation or instability of the electrical element performance in the compensation circuit caused by the manufacturing process, the electrical compensation sometimes cannot implement accurate compensation of the threshold voltage drift.
Disclosure of Invention
The invention provides an OLED bottom emission structure and a driving method thereof, aiming at the problems in the prior art. The OLED bottom emission structure can realize optical compensation, so that the complexity of the pixel circuit and the preparation process of the OLED bottom emission structure is reduced, the stability of the pixel circuit is ensured, the compensation accuracy and intellectualization are improved, and the display effect of the OLED bottom emission structure is improved.
The invention provides an OLED bottom emission structure, which comprises a display unit arranged on a substrate and a non-display unit arranged on the periphery of the display unit, wherein the display unit comprises an anode, a light-emitting functional layer and a cathode, the non-display unit comprises a pixel circuit, the anode and the pixel circuit are both arranged on the substrate and are positioned on the same side of the substrate, the light-emitting functional layer and the cathode are positioned on one side of the anode, which is far away from the substrate, and are sequentially arranged far away from the anode, and the OLED bottom emission structure also comprises an optical compensation unit, and the optical compensation unit is arranged on one side of the display unit, which is far away from the substrate, and is used for carrying out optical compensation on the display unit according to the light emission of the display unit.
Preferably, the optical compensation unit is correspondingly located in the area where the display unit is located.
Preferably, the touch screen further comprises an optical touch unit, wherein the optical touch unit is arranged on one side of the non-display unit, which is away from the substrate, and is correspondingly positioned in the area where the non-display unit is positioned, and is used for receiving light reflected by the touch object at the touch position and determining the touch position according to the light.
Preferably, the thickness of the film layer of the cathode is less than 1 μm; and/or a plurality of through holes are formed in the cathode and are uniformly distributed, and the aperture of each through hole is smaller than 20 nm.
Preferably, the optical compensation unit and the optical touch unit both adopt photosensitive sensors.
Preferably, the display unit comprises a plurality of display units, and the plurality of display units are arranged in an array; the optical compensation units are in one-to-one correspondence with the display units;
the non-display units are distributed in a grid mode, and the optical touch units are distributed in a grid mode.
Preferably, each of the optical compensation units is connected to a different signal outlet.
Preferably, the touch control device further comprises a filter film, wherein the filter film is correspondingly arranged in the area where the optical touch control unit is located, and the filter film is located between the pixel circuit and the optical touch control unit and used for filtering the touch control waste light reflected by the touch control object.
The invention also provides a driving method of the OLED bottom emission structure, which comprises the following steps: and driving the optical compensation unit to perform optical compensation on the light emission of the display unit while driving the OLED bottom emission structure to display.
Preferably, the method further comprises driving the optical touch unit to perform optical touch on the OLED bottom emission structure;
and after one frame of display is finished, independently providing exciting light for carrying out optical touch on the OLED bottom emission structure.
The invention has the beneficial effects that: according to the OLED bottom emission structure provided by the invention, the optical compensation of the OLED bottom emission structure can be realized by arranging the optical compensation unit, so that the complexity of the pixel circuit and the preparation process of the OLED bottom emission structure is reduced, the stability of the pixel circuit is ensured, the compensation accuracy and intellectualization are improved, and the display effect of the OLED bottom emission structure is improved.
Drawings
FIG. 1 is a schematic cross-sectional structural view of an OLED bottom emission structure of the present invention;
FIG. 2 is a circuit diagram of a pixel of an OLED bottom emission structure according to the present invention;
FIG. 3 is a circuit diagram of a photosensor in an OLED bottom-emitting structure according to the present invention;
FIG. 4 is a schematic diagram of the distribution and connection of optical compensation units in the OLED bottom emission structure according to the present invention;
FIG. 5 is a schematic diagram illustrating the distribution and connection of optical touch units in the OLED bottom emission structure according to the present invention;
FIG. 6 is a circuit diagram of another pixel of the OLED bottom emission structure of the present invention.
Wherein the reference numerals are:
1. a substrate; 2. a display unit; 21. an anode; 22. a light-emitting functional layer; 23. a cathode; 3. a non-display unit; 31. a pixel circuit; 4. an optical compensation unit; 5. an optical touch unit; 6. a light filtering film; 7. packaging glass; 8. and (7) a planarization layer.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the OLED bottom emission structure and the driving method thereof according to the present invention are further described in detail below with reference to the accompanying drawings and the detailed description.
The embodiment of the invention provides an OLED bottom emission structure, as shown in fig. 1, which includes a display unit 2 disposed on a substrate 1 and a non-display unit 3 located at the periphery of the display unit 2, where the display unit 2 includes an anode 21, a light-emitting functional layer 22 and a cathode 23, the non-display unit 3 includes a pixel circuit 31, the anode 21 and the pixel circuit 31 are both disposed on the substrate 1 and located at the same side of the substrate 1, the light-emitting functional layer 22 and the cathode 23 are located at a side of the anode 21 away from the substrate 1 and are sequentially disposed away from the anode 21, and an optical compensation unit 4, and the optical compensation unit 4 is disposed at a side of the display unit 2 away from the substrate 1 and is used for performing optical compensation on the display unit 2 according to light emission of the display unit 2.
The display unit 2 is an OLED pixel, and the non-display unit 3 is a pixel circuit 31 disposed at the periphery of the display unit 2. In this embodiment, the pixel circuit 31 has a 2T1C structure, as shown in fig. 2, the pixel circuit 31 realizes display driving of the OLED pixel, and since the OLED pixel is optically compensated in this embodiment, an electrical compensation part is not required to be disposed in the pixel circuit 31, so that the complexity of the manufacturing processes of the pixel circuit 31 and the OLED bottom emission structure is reduced, the stability of the pixel circuit 31 is ensured, and the compensation accuracy and intelligentization are improved.
In this embodiment, the optical compensation unit 4 is correspondingly located in the area where the display unit 2 is located.
The optical compensation unit 4 employs a photosensor, such as a PIN photosensor, an organic photosensor, or other photosensors. As shown in fig. 3, the read line is an output line of an electrical signal after photoelectric conversion of the photosensitive sensor, and the output line is connected to a control circuit of a data driving signal of the pixel circuit 31 to compensate the OLED pixel driving signal. The optical compensation unit 4 has an optical compensation principle in which the optical compensation unit 4 opposite to the anode 21 detects the light emission of the display unit 2, judges whether the light emission of the display unit 2 needs to be compensated, and determines the amount of compensation according to the light intensity of the light emission of the display unit 2.
The specific circuit structure of the optical compensation unit 4 for performing optical compensation on the OLED pixel is a relatively mature circuit, and is not described herein again.
Preferably, in the present embodiment, the thickness of the film layer of the cathode 23 is less than 1 μm. In the OLED bottom emission structure, the cathode 23 reflects light emitted from the light emitting functional layer 2, so that the light is emitted from the substrate 1, thereby implementing a bottom emission type OLED display. The thickness of the cathode 23 is such that about 5% of the light is transmitted, so that the optical compensation unit 4 can receive about 5% of the light emitted by the OLED pixel, and determine whether to compensate the light emission of the OLED pixel according to the intensity of the light. This thickness setting of negative pole 23 enables most demonstration light and all reflects from basement 1 outgoing through negative pole 23, and only a small portion shows that light sees through negative pole 23 and is used for optical compensation's compensation to judge, thereby can not only ensure the normal clear that end emission shows, the optical compensation of emission structure when showing at the bottom of can also realizing OLED simultaneously, promote the display effect of emission structure at the bottom of OLED greatly.
In addition to the above-described film layer thickness, the cathode 23 is also provided with a plurality of through holes, the plurality of through holes are uniformly distributed, and the aperture of the through holes is less than 20 nm. So set up, can not only ensure the normal clear that end emission shows equally, the optical compensation of emitting structure when showing at the bottom of can also realizing OLED simultaneously promotes the display effect of emitting structure at the bottom of OLED greatly.
This emission structure at bottom of OLED through setting up optical compensation unit 4, can realize the optical compensation of emission structure at bottom of OLED to not only reduced the preparation technology complexity of emission structure at bottom of pixel circuit 31 and OLED, still ensured pixel circuit 31's stability simultaneously, improved the accuracy and the intellectuality of compensation, promoted the display effect of emission structure at bottom of OLED.
In this embodiment, the OLED bottom emission structure further includes an optical touch unit 5, where the optical touch unit 5 is disposed on a side of the non-display unit 3 away from the substrate 1 and is located in an area where the non-display unit 3 is located, and is configured to receive light reflected by a touch object at the touch position and determine the touch position accordingly.
The optical touch units 5 are all photosensitive sensors, such as PIN photosensitive devices, organic photosensitive devices or other photosensitive devices. The touch object is a finger. As shown in fig. 3, a read line is an output line of an electrical signal after photoelectric conversion of the photosensitive sensor, and the output line is connected to a touch control circuit to determine a touch position. How to determine the touch position according to the electrical signal output by the read line of the optical touch unit 5 is a relatively mature technology, and is not described herein again. In this embodiment, the light-emitting functional layer 22 also extends to the area where the non-display unit 3 is located, so that the manufacturing process of the light-emitting functional layer 22 can be simplified, but the light-emitting functional layer 22 corresponding to the area of the non-display unit 3 does not emit light. The specific touch process of the optical touch unit 5 is that a finger touches a certain position of the substrate 1, display light is reflected by the finger and then reaches the optical touch unit 5 through the light-emitting functional layer 22, and the optical touch unit 5 converts the received reflected light into an electric signal and outputs the electric signal to the touch control circuit to determine the touch position of the finger.
In this embodiment, preferably, the OLED bottom emission structure further includes a filter 6, the filter 6 is correspondingly disposed in the area where the optical touch unit 5 is located, and the filter 6 is located between the pixel circuit 31 and the optical touch unit 5 and is configured to filter the touch-sensing waste light reflected by the touch object. The filter film 6 is mainly used for filtering infrared light, and since infrared light is reflected by fingers to easily saturate the photosensitive sensor, and then touch detection fails, the filter film 6 can avoid optical touch detection failure caused by touch useless light. The arrangement of the filter film 6 can improve the success rate and accuracy of optical touch control.
In addition, in the embodiment, the optical compensation unit 4 and the optical touch unit 5 are simultaneously formed on the package glass 7 and located on the same side of the package glass 7. The filter 6 is formed on a side of the optical touch unit 5 facing away from the package glass 7. The encapsulation glass 7 forming the above structure is combined with the substrate 1 forming the display unit 2 and the non-display unit 3 to form an OLED bottom emission structure. The gap between the optical compensation unit 4 and the display unit 2 and the gap between the filter 6 and the non-display unit 3 are filled with the planarization layer 8.
In this embodiment, as shown in fig. 4 and 5, the display unit 2 includes a plurality of display units 2, and the plurality of display units 2 are arranged in an array; the optical compensation units 4 are multiple, and the optical compensation units 4 correspond to the display units 2 one by one; with this arrangement, each optical compensation unit 4 can perform individual compensation for each OLED pixel, thereby improving optical compensation accuracy. The non-display units 3 are distributed in a grid manner, and the optical touch units 5 are distributed in a grid manner. In this way, the optical touch units 5 are arranged in the areas where the non-display units 3 are located, so that the touch resolution can be improved.
Preferably, as shown in fig. 4, each optical compensation unit 4 is connected to a different signal outlet. The independent compensation of each OLED pixel luminescence can be realized, so that the accuracy of optical compensation is improved, and the display effect of an OLED bottom emission structure is improved.
In addition, as shown in fig. 5, because the requirement of optical touch precision is low, the optical touch units 5 located in the area where the non-display unit 3 is located are combined in a large range, the optical touch units 5 in the peripheral and middle areas of every four adjacent optical compensation units 4 are combined into one optical touch unit 5, and the optical touch unit 5 is connected with one signal outgoing line. Of course, the merging range of the optical touch unit 5 can be arbitrarily divided according to the precision requirement of optical touch.
It should be noted that, in this embodiment, the optical compensation unit 4 and the optical touch unit 5 have the same device structure, and are located on the same layer, so that the two can be formed simultaneously through one manufacturing process (the one manufacturing process includes a plurality of process steps, and the plurality of process steps form each film layer in the photosensor respectively), so that the preparation of the OLED bottom emission structure is simpler.
Based on the above structure of the OLED bottom emission structure, this embodiment further provides a driving method of the OLED bottom emission structure, including: and driving the optical compensation unit to perform optical compensation on the light emission of the display unit while driving the OLED bottom emission structure to display.
The display driving of the OLED bottom emission structure and the optical compensation driving of the optical compensation unit are relatively mature technologies, and are not described herein again.
In this embodiment, the driving method further includes driving the optical touch unit to perform optical touch on the OLED bottom emission structure; the optical touch driving of the optical touch unit is also a relatively mature technology, and is not described herein again.
Preferably, after one frame of display is finished, the OLED bottom emission structure is separately provided with the exciting light for optical touch control of the OLED bottom emission structure. When the OLED bottom emission structure is optically touched, the following is generally used: the demonstration light of emission structure is reflected to the optics touch-control unit through the finger at bottom of the OLED, realize the optics touch-control to emission structure at bottom of the OLED, nevertheless touch-control at every turn is examined time measuring and can be received the influence that shows the light intensity, it is comparatively complicated to make rear end touch-control detection circuitry touch-control detection algorithm, so through after a frame shows, the space that shows promptly, insert the demonstration drive signal of fixed grey scale, emission structure sends the light of fixed grey scale at bottom of the drive OLED, this light is as the exciting light that realizes the touch-control, carry out the detection of touch-control position through the detection to the exciting light, thereby the comparatively complicated defect of above-mentioned touch-control detection algorithm has been avoided, optics touch-control accuracy and touch-control effect have been promoted. Meanwhile, the area of the optical touch unit is larger, so that the time required by touch detection is shorter, and the touch detection can be easily realized by generating exciting light by inserting the display driving signal with fixed gray scale. At this time, the pixel circuit is changed to the one shown in fig. 6, the display drive signal of the fixed gray scale in fig. 6 is the VD signal, and the switching tube T0 is added to control the insertion of the VD signal.
The invention has the beneficial effects that: according to the OLED bottom emission structure provided by the invention, the optical compensation of the OLED bottom emission structure can be realized by arranging the optical compensation unit, so that the complexity of the pixel circuit and the preparation process of the OLED bottom emission structure is reduced, the stability of the pixel circuit is ensured, the compensation accuracy and intellectualization are improved, and the display effect of the OLED bottom emission structure is improved.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention, and such modifications and improvements are also considered to be within the scope of the invention.
Claims (3)
1. An OLED bottom emission structure comprises a display unit arranged on a substrate and a non-display unit arranged on the periphery of the display unit, wherein the display unit comprises an anode, a light-emitting functional layer and a cathode, the non-display unit comprises a pixel circuit, the anode and the pixel circuit are both arranged on the substrate and are positioned on the same side of the substrate, the light-emitting functional layer and the cathode are positioned on one side of the anode, which is far away from the substrate, and are sequentially far away from the anode;
the orthographic projection of the cathode on the substrate is overlapped with the orthographic projection of the anode on the substrate, and the orthographic projection of the cathode on the substrate is not overlapped with the orthographic projection of the pixel circuit on the substrate;
the optical compensation unit is correspondingly positioned in the area where the display unit is positioned;
the thickness of the film layer of the cathode is less than 1 μm; and/or a plurality of through holes are arranged in the cathode and are uniformly distributed, and the aperture of each through hole is smaller than 20 nm;
the optical touch unit is arranged on one side of the non-display unit, which is far away from the substrate, is correspondingly positioned in the area where the non-display unit is positioned, and is used for receiving light reflected by a touch object at a touch position and determining the touch position according to the light;
the optical compensation unit and the optical touch control unit have the same device structure and are positioned on the same layer;
the display units are arranged in an array; the optical compensation units are in one-to-one correspondence with the display units; each optical compensation unit is connected with a different signal outgoing line;
the non-display units are distributed in a grid manner, and the optical touch units are distributed in a grid manner;
the pixel circuit further comprises a filter film, the filter film is correspondingly arranged in the area where the optical touch unit is located, and the filter film is located between the pixel circuit and the optical touch unit and used for filtering touch useless light reflected by a touch object.
2. The OLED bottom-emitting structure of claim 1, wherein the optical compensation unit and the optical touch unit both employ photosensitive sensors.
3. A method for driving the OLED bottom-emitting structure according to any one of claims 1-2, comprising: driving the optical compensation unit to perform optical compensation on the light emission of the display unit while driving the OLED bottom emission structure to display;
the OLED bottom emission structure is driven by the optical touch unit to perform optical touch;
and after one frame of display is finished, independently providing exciting light for carrying out optical touch on the OLED bottom emission structure.
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| CN109244270B (en) * | 2018-09-20 | 2020-08-18 | 京东方科技集团股份有限公司 | Bottom-emitting OLED display substrate, manufacturing method thereof and display device |
| CN109713018B (en) * | 2019-01-14 | 2020-08-21 | 京东方科技集团股份有限公司 | Display device and manufacturing method thereof |
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| CN101976679A (en) * | 2010-03-11 | 2011-02-16 | 友达光电股份有限公司 | Active matrix organic light emitting diode display with light feedback and compensation |
| CN106549075A (en) * | 2015-09-23 | 2017-03-29 | 三星显示有限公司 | Optical sensor and the display device including optical sensor |
| CN109196524A (en) * | 2018-02-23 | 2019-01-11 | 深圳市汇顶科技股份有限公司 | Optical imagery under screen in equipment with Organic Light Emitting Diode (OLED) screen or other screens for shielding upper fingerprint sensing in optical sensor module via imaging len and image pinhole |
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