CN114530481A - Display panel, manufacturing method thereof, brightness compensation method and display device - Google Patents

Abstract

The invention discloses a display panel and a manufacturing method thereof, a brightness compensation method and a display device, wherein the display panel comprises a substrate, a display area of the display panel is divided into a plurality of target sub-areas, and each target sub-area comprises: the organic photoelectric detection device is used for acquiring the light-emitting brightness signals of the characteristic sub-pixels in the target sub-area to determine whether the light-emitting condition of the characteristic sub-pixels reaches the preset compensation condition or not so as to perform brightness compensation on the corresponding characteristic sub-pixels in the target sub-area reaching the preset compensation condition. Therefore, the brightness attenuation of each sub-region characteristic sub-pixel is compensated in time, and the problem of uneven display brightness is solved.

Description

Display panel and manufacturing method thereof, brightness compensation method, and display device

technical field

The present invention relates to the field of display technology, and in particular, to a display panel and a method for manufacturing the same, a method for compensating for brightness, and a display device.

Background technique

In OLED (Organic Light-Emitting Diode, organic light-emitting diode) display, affected by the drift of device characteristics and the aging of EL (Emitting Layer, light-emitting layer) materials, EL display devices are more likely to display brightness after long-term high-brightness operation. changes, which in turn leads to uneven display and even Mura.

Conventional display devices use external or internal compensation threshold voltage (Vth) to improve device drift, but on the one hand, after long-term operation, the Vth of the device is no longer the only factor affecting the EL current. On the other hand, the EL material itself has Burn-in, especially differences in RGB pixel material aging, also cannot be eliminated with conventional external or internal compensation.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention is proposed in order to provide a display panel, a method for manufacturing the same, a method for compensating for brightness, and a display device which overcome the above problems or at least partially solve the above problems.

In a first aspect, embodiments of this specification provide an organic light-emitting display panel, including a base substrate, and a display area of the display panel is divided into a plurality of target sub-areas, wherein each target sub-area includes:

at least one pixel unit, each pixel unit includes multiple sub-pixels of different colors;

at least one organic photodetection device disposed on the base substrate, the organic photodetection device is used to collect the luminous intensity signal of the characteristic sub-pixel in the target sub-area, and the luminous intensity signal is used to determine the characteristic sub-pixel Whether the light-emitting condition of the pixel reaches the preset compensation condition, so as to perform brightness compensation on the corresponding characteristic sub-pixels in the target sub-region that reaches the preset compensation condition.

Further, the number of pixel units contained in each target sub-region is greater than or equal to four.

Further, the characteristic sub-pixel is a blue sub-pixel, and the organic photodetector is made of a blue light-absorbing material; or, the characteristic sub-pixel is a green sub-pixel, and the organic photodetection device is made of a green light-absorbing material or, the characteristic sub-pixel is a red sub-pixel, and the organic photodetection device is made of a red light-absorbing material; or, the characteristic sub-pixel includes: a blue sub-pixel, a green sub-pixel and a red sub-pixel.

Further, the organic photodetection device includes: an anode, a cathode, a detection function layer, and an exciton blocking layer disposed between the anode and the detection function layer and/or between the cathode and the detection function layer The exciton blocking layer is used to block the excitons excited by the detection functional layer from diffusing to the electrode interface and quenching.

Further, each sub-pixel has an organic light-emitting device disposed on the base substrate, and the organic light-emitting device includes an anode, a cathode, and an organic material sandwiched between the anode and the cathode, so The organic material includes a light-emitting layer and a common layer, the exciton blocking layer of the organic photodetection device shares the common layer of the organic light-emitting device, and the thickness of the exciton blocking layer in the direction perpendicular to the substrate is less than Common layer thickness of the organic light emitting device.

Further, the target position of at least one common layer of the organic light-emitting device is provided with a groove, and the target position is the position where the organic photodetection device is integrated, and the bottom surface of each groove is an orthographic projection on the surface of the substrate substrate. At least partially overlapping with the orthographic projection of the detection functional layer of the corresponding organic photodetection device on the surface of the base substrate.

Further, the at least one common layer includes an electron transport layer.

In a second aspect, embodiments of the present specification further provide a method for manufacturing an organic light-emitting display panel, wherein a display area of the display panel is divided into a plurality of target sub-areas, each target sub-area includes: at least one pixel unit and at least one target sub-area. An organic photodetection device, each pixel unit includes a plurality of sub-pixels of different colors, the organic photodetection device is used to collect the luminous brightness signal of the characteristic sub-pixel in the target sub-region, and the method includes:

Provide a base substrate;

A functional layer is formed on the base substrate, and a common layer shared by the organic photodetection device and the organic light-emitting device included in the sub-pixel is formed, wherein the functional layer includes: a light-emitting layer corresponding to each sub-pixel and The detection functional layer of the organic photodetection device.

Further, forming a common layer shared by the organic photodetection device and the organic light-emitting device included in the sub-pixel includes:

Each layer of the common layer is formed in sequence, and a groove is formed at a target position of at least one common layer, wherein the target position is the position where the detection function layer is formed, and the bottom surface of each groove is on the base substrate The orthographic projection of the surface at least partially overlaps the orthographic projection of the corresponding detection functional layer on the surface of the base substrate.

Further, forming a groove at a target position of at least one common layer includes:

forming a first electron transport film layer covering the entire functional layer on the functional layer;

A second electron transport film layer is formed on a region of the first electron transport film layer that does not cover the detection function layer through a mask, so as to form the groove in the electron transport layer included in the common layer.

Further, the thickness of the first electron transport film layer is 3-8 nm, and the thickness of the second electron transport film layer is 20-30 nm.

In a third aspect, the embodiments of this specification provide a brightness compensation method, which is applied to an organic light-emitting display panel. The display area of the display panel is divided into a plurality of target sub-areas, and each target sub-area includes: at least one pixel unit , each pixel unit includes multiple sub-pixels of different colors, and the method includes:

Obtain the luminous brightness signal of the characteristic sub-pixels in each target sub-region;

For each target sub-area, it is determined based on the light-emitting luminance signal whether the light-emitting condition of the characteristic sub-pixel reaches a preset compensation condition, and if so, performs luminance compensation on the corresponding characteristic sub-pixel in the target sub-area.

In a fourth aspect, an embodiment of the present specification provides a display device, including the organic light-emitting display panel described in the first aspect.

The technical solutions provided in the embodiments of this specification have at least the following technical effects or advantages:

The display panel and the method for fabricating the same, the method for compensating the brightness, and the display device provided by the embodiments of this specification divide the display area of the organic light-emitting display panel into a plurality of target sub-areas, each target sub-area includes: at least one pixel unit and At least one organic photodetection device uses the organic photodetection device to collect the light emission brightness signal of the characteristic sub-pixel in the target sub-region, to determine whether the light emission of the characteristic sub-pixel reaches the preset compensation condition, so as to meet the target of the preset compensation condition. The corresponding characteristic sub-pixels in the sub-regions perform brightness compensation. In this way, the brightness self-detection of sub-regions can be realized, which is beneficial to timely compensate the brightness attenuation of characteristic sub-pixels in each sub-region, and improve the problem of uneven display brightness and even Mura, so as to obtain better display effects and improve user experience.

The above description is only an overview of the technical solutions provided by the embodiments of this specification. In order to understand the technical means of the embodiments of this specification more clearly, it can be implemented according to the content of the specification, and in order to make the above-mentioned and other purposes of the embodiments of this specification, The features and advantages can be more clearly understood, and the specific implementation of the embodiments of the present specification will be described below.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be considered limiting of the invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

FIG. 1 is a schematic structural diagram of an organic light-emitting display panel according to the first aspect of the embodiment of the present specification;

FIG. 2 is a schematic diagram 1 of the layout of the organic photodetector device in the embodiment of this specification;

FIG. 3 is a second schematic diagram of the layout of the organic photodetector device in the embodiment of this specification;

FIG. 4 is a schematic diagram 3 of the layout of the organic photodetector device in the embodiment of this specification;

FIG. 5 is a schematic diagram 4 of the layout of the organic photodetector device in the embodiment of this specification;

FIG. 6 is a flowchart of a method for fabricating an organic light-emitting display panel according to the second aspect of the embodiment of the present specification;

Fig. 7 is the schematic diagram after the evaporation of the functional layer is completed;

8 is a schematic diagram after the evaporation of the first electron transport film layer is completed;

9 is a schematic diagram after the evaporation of the second electron transport film layer is completed;

10 is a flowchart of a brightness compensation method according to a third aspect of the embodiment of the present specification;

FIG. 11 is a schematic structural diagram of a display device according to a fourth aspect of an embodiment of the present specification.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that, in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

In a first aspect, as shown in FIG. 1 , an embodiment of the present specification provides an organic light emitting display panel. The display panel 100 includes a base substrate (not shown in the figure). The display area of the display panel 100 is divided into a plurality of target sub-areas 110 . Each target sub-region 110 includes: at least one pixel unit 101 and at least one organic photodetection device 102 disposed on the base substrate. It should be noted that the division of the target sub-area 110 and the distribution of the pixel units 101 and the organic photodetection devices 102 in the target sub-area 110 shown in FIG. 1 are for illustration only and not for limitation. By disposing the organic photodetection device 102 in each target sub-region 110 correspondingly, the brightness self-detection of the sub-region can be realized.

For the convenience of management, the distribution of each target sub-area 110 may be numbered corresponding to the specific implementation. For example, each target sub-area 110 may be distributed in an array, and the number is denoted as: (x, y), where x represents where the area is located. The row, y represents the column in which the region is located. If it is assumed that the panel display area is divided into 4*4 target sub-areas 110, the target sub-area 110 located in the first row and the first column can be numbered as (1, 1), and the target sub-area located in the first row and the second column can be numbered as (1, 1). 110 can be numbered as (1, 2), and so on.

Specifically, the specific division method of the target sub-region 110 and the detection pixel density, that is, the arrangement density of the organic photodetection devices 102 can be determined according to actual needs, which are not limited in this embodiment.

For example, as shown in FIG. 2 , an organic photodetection device 102 may be provided for each pixel unit 101 to perform brightness detection, so as to achieve fine adjustment. However, since the organic photodetection device 102 itself needs to occupy a certain space, considering that an excessively high detection pixel density will bring about a significant decrease in the aperture ratio, in an optional implementation manner, each target sub-region 110 contains The number of pixel units 101 may be greater than or equal to four, so that one organic photodetector 102 may be provided for every four or more pixel units, so as to achieve a better detection effect and meet the aperture ratio requirement.

Further, in an optional implementation manner, considering that the brightness difference in the edge regions of the display panel is relatively large, the target sub-regions 110 located in the edge and central regions of the panel can be differentiated. For example, the edge target sub-regions contain The number of pixel units 101 can be smaller than the number of pixel units 101 contained in the central target sub-area, that is, the detected pixel density in the edge area is relatively larger, so that brightness compensation can be performed on the edge area in a more refined manner, which is beneficial to improve the accuracy of brightness compensation. , to better improve the problem of uneven display brightness.

In this embodiment, each pixel unit 101 includes sub-pixels of multiple different colors, such as red sub-pixels (R), green sub-pixels (G), and blue sub-pixels (B). Specifically, the sub-pixels included in a single pixel unit 101 The pixel color and pixel arrangement can be determined according to the actual application scenario. The organic photodetection device 102 is used to collect the light emission luminance signal of the characteristic sub-pixel in the target sub-region 110 . As an embodiment, the organic photodetection device 102 may be an organic photodiode (Organic Photo-Diode, OPD for short).

Further, the luminescence luminance signal collected by the organic photodetection device 102 is used to determine whether the luminescence of the characteristic sub-pixels reaches the preset compensation condition, so as to perform luminance compensation on the corresponding characteristic sub-pixels in the target sub-region 110 that meets the preset compensation condition. The characteristic sub-pixels may be one or more of the above-mentioned various sub-pixels of different colors. The preset compensation conditions can be preconfigured according to the needs of actual application scenarios, and are used to measure whether the characteristic sub-pixels have brightness drift. That is to say, if it is detected that the light emission of the characteristic sub-pixels in the target sub-area 110 reaches the preset compensation condition, it means that the characteristic sub-pixels of the target sub-area 110 have undergone luminance drift, so it is necessary for all the characteristic sub-pixels in the target sub-area 110 to have brightness drift. The sub-pixels of the corresponding colors perform luminance compensation.

During specific implementation, the characteristic sub-pixels may be determined according to the needs of actual application scenarios. In an optional embodiment, the characteristic sub-pixel may be a sub-pixel of a single color, such as a blue sub-pixel, a red sub-pixel or a green sub-pixel.

For example, considering that blue sub-pixels are more prone to aging, the light emission conditions of some blue sub-pixels in each target sub-region 110 can be detected, that is, the characteristic sub-pixels are blue sub-pixels, and the organic photodetection device 102 uses blue Made of light absorbing material. For example, as shown in FIG. 3 , organic photodetection devices made of blue light-absorbing materials can be arranged near certain blue sub-pixels in each target sub-region 110 (three blue sub-pixels are taken as an example in the figure) 102, at this time, these several blue sub-pixels are characteristic sub-pixels, and the organic photodetection device 102 collects the light-emitting brightness signals of these several blue sub-pixels to perform brightness self-detection on each target sub-region 110, respectively, In this way, the luminance compensation of the blue sub-pixels with luminance drift occurs in different regions. It should be noted that this embodiment does not limit the specific arrangement position of the organic photodetection device 102 in the target sub-area 110 to which it belongs, and is specifically determined according to the layout of the sub-pixels in the target sub-area 110 and the aperture ratio requirements, which can detect The lighting conditions of the corresponding characteristic sub-pixels are sufficient.

Of course, in other embodiments of this specification, the light emission of some green sub-pixels in each target sub-region 110 can also be detected as required, that is, the characteristic sub-pixels can also be green sub-pixels, and accordingly, the organic photodetection device 102 Made of green light absorbing material. For example, as shown in FIG. 4 , an organic photodetection device 102 made of a green light-absorbing material can be arranged near certain green sub-pixels (6 green sub-pixels are taken as an example in the figure) in each target sub-region 110 . At this time, these green sub-pixels are characteristic sub-pixels, and the organic photodetection device 102 collects the light-emitting luminance signals of these green sub-pixels to perform luminance self-detection on each target sub-area 110 respectively, so that the occurrence of Brightness compensation is performed on the green sub-pixels whose brightness drifts. Similarly, as shown in FIG. 5 , the light emission of some red sub-pixels in each target sub-region 110 can also be detected as required, that is, the characteristic sub-pixels can also be red sub-pixels. Correspondingly, the organic photodetection device 102 adopts Made of red light-absorbing material.

In an optional implementation manner, the characteristic sub-pixels may also include sub-pixels of multiple colors. In this case, it is necessary to specifically perform luminance compensation on the sub-pixels whose light emission conditions meet the preset compensation condition. For example, in an application scenario, compensation detection can be performed on the three-color sub-pixels of each target sub-region 110 , that is, the characteristic sub-pixels include red, green, and blue sub-pixels, and the organic photodetection devices disposed in each target sub-region 110 102 can detect the light-emitting luminance signals of the red, green and blue sub-pixels in the target sub-area 110 respectively, so that the drifting part of each color can be compensated separately, which can not only compensate for the luminance drift of the target sub-area 110, The chromaticity drift of the target sub-region 110 can also be compensated, which is beneficial to better ensure the display effect.

In addition, the shape of the organic photodetector 102 on the plane parallel to the substrate can be determined according to actual needs, for example, it can be a circle, a trapezoid, a square, or a symmetrical polygon such as a prism or a hexagon. The example does not limit this.

Specifically, after acquiring the light emission luminance signal of the characteristic sub-pixel, there may be various implementations for determining whether the light emission condition satisfies the preset compensation condition. For example, taking the characteristic sub-pixel as a single-color sub-pixel as an example, the reference luminance value collected by the organic photodetection device 102 set in each target sub-region 110 in a normal state can be stored in advance; on this basis, the display device can In response to the trigger command of the brightness compensation function, for each target sub-area 110, the measured brightness value detected by the organic photodetection device 102 is compared with the corresponding reference brightness value. If the brightness difference value exceeds the preset error range, it means that The characteristic sub-pixels of the target sub-area 110 have luminance drift, so it is determined that the lighting condition satisfies the preset compensation condition, and if the luminance difference is within the predetermined error range, it is determined that the lighting condition of the target sub-area 110 does not satisfy the preset compensation condition .

Similarly, in a scenario where the characteristic sub-pixels include sub-pixels of multiple colors, such as sub-pixels of red, green, and blue, the tri-colors collected by the organic photodetection device 102 in each target sub-area 110 in a normal state can be stored in advance. The reference luminance value of the characteristic sub-pixels is used to determine whether the light emission of each characteristic sub-pixel satisfies the preset compensation condition.

Further, after the brightness difference between the measured brightness value and the corresponding reference brightness value is clarified, for the target sub-region 110 that reaches the preset compensation condition, the corresponding feature sub-region 110 can be determined based on the brightness difference value and the preset grayscale data table. The state of the pixel under different gray scales is compensated, and the specific principle can be found in the related art, which will not be described in detail here.

It should be noted that the brightness compensation itself is limited. For example, the upper limit of the compensation can be set according to the brightness compensation capability of the actual panel. If the brightness difference of the target sub-region 110 exceeds the upper limit of the compensation, the brightness difference needs to be multiplied by Appropriate compensation coefficients are used to obtain a compensation amount that meets the requirements, and then the states of the corresponding feature sub-pixels under different grayscales are compensated according to the obtained compensation amount, otherwise the compensation will not take effect. Of course, if none of the luminance difference values of the target sub-region 110 exceeds the upper limit of compensation, the luminance difference value may be used as a compensation amount to perform luminance compensation on the corresponding characteristic sub-pixels.

The value of the compensation coefficient is greater than 0 and less than 1. For example, a compensation coefficient sequence can be preset, and the compensation coefficient sequence includes multiple candidate compensation coefficients descending along the gradient. First, multiply the luminance difference value by the largest candidate compensation coefficient, such as 0.95. If the compensation amount after multiplied by 0.95 satisfies the If the upper limit of compensation is required, it can be performed according to the compensation amount; if it is not satisfied, multiply the brightness difference value by the next largest alternative compensation coefficient, such as 0.9, and so on, until an appropriate compensation coefficient is selected, and a value that does not exceed the upper limit of compensation is obtained. The compensation amount is to make the compensation effective as much as possible, and at the same time make the compensation of each target sub-region 110 as uniform as possible.

The organic light-emitting display panel 100 provided in this embodiment combines the organic photodetection device 102 and the organic light-emitting device. The panel display area is divided into a plurality of target sub-areas 110, and the organic photoelectric detection device 102 is respectively arranged in each sub-area to monitor The light emission of the sub-region is beneficial to timely compensate the brightness attenuation of the characteristic sub-pixels of each sub-region, and improve the problem of uneven display brightness or even Mura, so as to obtain a better display effect.

Further, it can be understood that the hierarchical structure of the organic photodetection device 102 may include: an anode, a cathode, a detection functional layer, and an exciton blocking layer disposed between the anode and the detection functional layer and/or between the cathode and the detection functional layer The detection functional layer is used to excite excitons, ie electron-hole pairs, under the action of light, and the exciton blocking layer is used to prevent the excitons excited by the detection functional layer from diffusing to the electrode interface for quenching.

For example, taking OPD as an example, along the direction perpendicular to the substrate, the hierarchical structure of OPD can be, from bottom to top, an anode, a hole transport layer, a detection function layer, an electron transport layer and a cathode in sequence, wherein the detection function layer is in turn. Including a donor layer and an acceptor layer, the exciton blocking layer may include a hole transport layer and an electron transport layer. For example, the thickness of the anode may be 100 nm, the thickness of the hole transport layer may be 100 nm, the thickness of the donor layer may be 15 nm, the thickness of the acceptor layer may be 45 nm, the thickness of the electron transport layer may be 10 nm, and the thickness of the cathode may be 80nm.

Contrary to OLED, OPD mainly absorbs external light, and electron-hole pairs are excited by photons in the donor layer and acceptor layer, which are called excitons. The excitons are split into electrons and holes, which are then attracted by the electrodes on both sides and become part of the current. Therefore, the illumination has a relatively obvious modulation effect on the photodiode current. In the process of exciton diffusion, too fast or too slow will affect this modulation. Excitons are quenched at the electrode interface, causing waste of excitons. After adding the exciton blocking layer, the excitons can be blocked from diffusing to the electrode interface to a certain extent, thus avoiding the waste of exciton quenching and improving the exciton separation efficiency. But the exciton blocking layer cannot be too thick, otherwise it will affect the electron and hole diffusion.

Each sub-pixel of the organic light-emitting display panel 100 has an organic light-emitting device disposed on the base substrate. The organic light emitting device includes an anode, a cathode, and an organic material interposed between the anode and the cathode. Organic materials are mainly composed of two parts: the light-emitting layer and the common layer. For example, in the currently used multi-layer device structure, the common layer can be subdivided into: Hole Injection Layer (HIL), Hole Transport Layer (HTL), Electron Transport Layer (Electron Transport Layer, ETL) and electron injection layer (Electron Injection Layer, EIL), the subdivision level of the specific common layer can be determined according to the structure of the organic light-emitting device used in the actual application scenario.

In order to facilitate the detection of the light emission of the characteristic sub-pixels, the organic photodetection devices 102 provided in each target sub-region 110 in this embodiment may be integrated into the organic light-emitting devices, that is, the exciton blocking layers of the organic photodetection devices 102 may share the organic light-emitting devices public layer. That is to say, the material of the film layer contained in the exciton blocking layer and the common layer of the organic light-emitting device is consistent, and the specific level subdivision can be determined according to the actual application scenario. For example, in the above OPD structure example, the exciton blocking layer is subdivided into a hole transport layer and an electron transport layer, and the common layer of the organic light-emitting device is also subdivided into: a hole transport layer and an electron transport layer, which can be shared.

However, the existing organic light-emitting device is set for the purpose of emitting light, so its film layer setting is obviously the main target. In this case, the film layer of the organic photodetector device 102 is generally difficult to completely match the organic light-emitting device. In practice, the difference is often larger. It is found through research that, in practical applications, due to the limitation of the integrated organic light-emitting device, the efficiency of the organic photodetector device 102 will be reduced due to the influence of the film layer of the original organic light-emitting device. Especially when the exciton blocking layer is too thick, it will greatly block the transfer of electrons from the active layer to the cathode, resulting in the loss of photocurrent and seriously affecting the external quantum efficiency (EQE).

It has been proved by experiments that if the thickness of the exciton blocking layer is adjusted from 30 nm to 5 nm, the photocurrent density can be increased from 2.52E-4 to 2.70E-4, as shown in Table 1. This shows that a reasonable adjustment of the exciton blocking layer can effectively improve the photocurrent density and thus the EQE (experimental proof can be increased from 28% to 41.7%).

Table 1

Therefore, in an optional implementation manner, by optimizing the film layer process of the integrated device, in the organic light emitting display panel 100 provided in this embodiment, the exciton blocking layer in the organic photodetector device 102 is perpendicular to the substrate. The thickness in the direction of the base substrate is smaller than the thickness of the common layer of the organic light emitting device. In this way, the integrated organic photodetection device 102 can achieve higher efficiency, effectively improve the signal-to-noise ratio of the organic photodetector device 102, and the EQE can be significantly improved, which is beneficial to improve the accuracy of the above-mentioned brightness detection, and further improves the The accuracy of brightness compensation.

In an optional implementation manner, a groove is provided at a target position of at least one common layer of the organic light-emitting device, and the target position is a position where the organic photodetector device 102 is integrated. The orthographic projection of the bottom surface of each groove on the surface of the base substrate at least partially overlaps the orthographic projection of the detection functional layer of the corresponding organic photodetector device 102 on the surface of the base substrate. It should be noted that, herein, the at least partial overlap may include a partial overlap of the two orthographic projection regions, and two cases where the two orthographic projection regions completely overlap. In this way, the thickness of the common layer of the organic light-emitting device can be kept unchanged, so that the thickness of the exciton blocking layer of the organic photodetector device 102 can be appropriately reduced on the basis of its thickness. The organic photodetection device 102 achieves higher efficiency.

For example, in the process of forming the common layer of the organic light-emitting device, the above-mentioned grooves can be formed at the target position of at least one common layer by using a mask such as OPEN Mask or FMM (Fine Metal Mask, fine metal mask), so as to The thickness of the exciton blocking layer of the organic photodetection device 102 is appropriately thinned.

In order to further reduce the complexity of the process, in an optional implementation manner, the above-mentioned grooves may be provided at the target positions of the electron transport layer. For example, in the panel fabrication process, after evaporating the red, green and blue light-emitting units and the detection functional layers of the organic photodetector 102, and continuing to evaporate the electron transport layer, a layer of electrons with a thickness of about 3-8 nm can be pre-evaporated. The transmission film layer, the film layer is full-layer evaporation; then, using OPEN Mask or FMM, in the area of the film surface that is not covered with the detection function layer, the electron transmission film layer is evaporated again, and the evaporation thickness is about 20 ~30nm. In this way, the above-mentioned groove structure can be formed at the target position of the electron transport layer, and the groove depth is 20-30 nm, that is, the thickness of the exciton blocking layer is reduced by 20-30 nm.

Of course, in other embodiments of this specification, the above-mentioned grooves may also be provided at target positions of other common layers such as hole injection layers, hole transport layers or electron injection layers according to actual needs, which are not limited in this embodiment.

In a second aspect, the embodiments of the present specification further provide a method for fabricating an organic light emitting display panel, as shown in FIG. 6 , the fabrication method may at least include the following steps S601 and S602.

Step S601, providing a base substrate.

It can be understood that the base substrate may include an array substrate, an anode formed on the surface of the array substrate, and a related film layer that needs to be arranged between the array substrate and the anode. For the specific structure and process, please refer to the related technologies of organic light-emitting display panels, which are not described here. Do detail.

Step S602, forming a functional layer on the base substrate, and forming a common layer shared by the organic photodetection device and the organic light-emitting device included in the sub-pixel, wherein the functional layer includes: a light-emitting layer corresponding to each sub-pixel and the organic photodetection device. Check the functional layer.

The common layer is specifically determined according to the structure of the organic light-emitting device used in the actual application scenario. For example, the common layer of the organic light-emitting device can be subdivided into: a hole transport layer and an electron transport layer, wherein the hole transport layer is located between the anode and the light-emitting layer, and the electron transport layer is located between the light-emitting layer and the cathode. For example, the light-emitting layer may include a light-emitting layer (red light-emitting layer) corresponding to a red sub-pixel, a light-emitting layer (green light-emitting layer) corresponding to a green sub-pixel, and a light-emitting layer (blue light-emitting layer) corresponding to a blue sub-pixel.

Correspondingly, the exciton blocking layer of the organic photodetection device also includes: a hole transport layer and an electron transport layer. The detection functional layer generally includes a donor layer and an acceptor layer, and for details, reference may be made to the relevant descriptions in the embodiments of the first aspect. Thus, the organic photodetection device can share the cathode, the anode, and the common layers of the organic light-emitting device, that is, the hole transport layer and the electron transport layer.

In an optional implementation manner, the above-mentioned process of forming a common layer shared by the organic photodetector device and the organic light-emitting device included in the sub-pixels may include: sequentially forming each layer of the common layer, and at a target position of at least one common layer The grooves are formed, wherein the target position is the position where the detection function layer is formed, and the orthographic projection of the bottom surface of each groove on the surface of the base substrate at least partially overlaps the orthographic projection of the corresponding detection function layer on the surface of the base substrate. In this way, the thickness of the exciton blocking layer of the integrated organic photodetecting device can be reduced without affecting the luminous efficiency of the organic light-emitting device, namely the EL device, so that the integrated organic photodetecting device can achieve higher efficiency and effectively improve the organic photoelectric detection device. Signal-to-noise ratio and EQE of photodetector devices.

During specific implementation, in order to further reduce the complexity of the process, the at least one common layer may be an electron transport layer formed on the functional layer. Of course, in other embodiments of this specification, the above-mentioned grooves can also be set at target positions of other common layers such as hole injection layers, hole transport layers or electron injection layers according to the actual device structure and the thickness of the exciton blocking layer. , which is not limited in this embodiment.

Specifically, the process of forming the groove at the target position of the electron transport layer may include: after forming the functional layer, forming a first electron transport film layer covering the entire functional layer on the functional layer in advance; A second electron transport film layer is formed on an area of an electron transport film layer that is not covered with the detection function layer, so as to form grooves in the electron transport layer included in the common layer.

For ease of understanding, an exemplary process for preparing a display panel is described below with reference to FIGS. 7 to 9 , taking the exciton blocking layer sharing the hole transport layer and the electron transport layer of the organic light-emitting device as an example.

First, the backplane fabrication and pre-evaporation process of the panel are normally completed, that is, the base substrate 210 is provided.

Then, vapor deposition of the hole transport layer 220 and the functional layer 230 between the anode (not shown in the figure) and the functional layer is sequentially completed on the base substrate 210 . The functional layer 230 includes a red light-emitting layer 231 , a green light-emitting layer 232 , a blue light-emitting layer 233 and a detection function layer 234 of an organic photodetector device. At this time, the red light-emitting layer 231 , the green light-emitting layer 232 , the blue light-emitting layer 233 and the detection function layer 234 are located in the same layer, as shown in FIG. 7 .

Next, the vapor deposition of the electron transport layer 240 is continued, wherein an electron transport film layer with a thickness of about 3-8 nm is vapor deposited in advance. For full-layer evaporation, as shown in Figure 8; then carry out the secondary evaporation of the electron transport film layer 240: using OPEN Mask or FMM, on the first electron transport film layer 241, the area outside the pattern of the organic photoelectric detection device is namely The electron transport film layer is evaporated in the area not covered with the detection function layer 234, the film layer evaporated this time can be called the second electron transport film layer 242, and the thickness of the film layer can be about 20-30 nm, so as to complete the patterning The electron transport layer 240 , that is, the groove 243 formed at the target position of the electron transport layer 240 , as shown in FIG. 9 . Such an integrated organic photodetection device can not only share the common layer of the organic light-emitting device, but also can reduce the thickness of the exciton blocking layer without affecting the thickness of the common layer of the organic light-emitting device in advance. It should be noted that the area filled with oblique lines in FIG. 9 illustrates the exciton blocking layer of the organic photodetection device in this example, and its thickness in the direction perpendicular to the substrate (that is, the hole transport layer 220 and the first electron The total thickness of the transport film layer 241) is less than the thickness of the common layer of the organic light emitting device (ie, the total thickness of the hole transport layer 220 and the electron transport layer 240).

Further, the evaporation of other common layers up to the cathode can be continued, and the evaporation of other integrated devices can be completed. For details, please refer to the related art, which will not be described in detail here.

It should be noted that the method for fabricating an organic light-emitting display panel provided in the second aspect can be applied to fabricating an organic light-emitting display panel that needs to integrate an organic photodetector device in an organic light-emitting device, that is, an OLED. In one application scenario, it can be used to prepare the organic light-emitting display panel provided in the first aspect. At this time, in the above step S602, the distribution of the detection function layer is determined according to the arrangement position of the organic photodetector device 102 in each target sub-region 110 of the panel, and the material of the detection function layer 234 is determined according to the characteristic sub-pixels to be detected.

Additionally, it is understood that the performance of organic photodetection devices such as organic photodiodes (OPDs) have now advanced to the point where they can provide more functionality than conventional silicon photodiode technology, especially in applications such as biomedical imaging and biometric monitoring middle. Other potential applications include human-machine interfaces, such as contactless gesture recognition and control, and fingerprint recognition. Therefore, by integrating the organic photodetection device into the organic light-emitting device of the display panel, in-screen fingerprints and other biometric functions can be obtained.

Therefore, in another application scenario, the method for fabricating an organic light-emitting display panel provided in the second aspect can also be used for fabricating an organic light-emitting display panel with in-screen fingerprints and other biometric functions. At this time, in the above-mentioned step S602, the distribution of the detection function layer 234 is determined according to the setting positions of the fingerprints on the screen and other biometric function modules, and the material of the detection function layer 234 is adapted to the wavelength band of the correspondingly set sensing light source. The above fabrication method appropriately adjusts the thickness of the exciton blocking layer in the organic photodetector device through the sub-regional patterning scheme, so that it can obtain higher efficiency on the basis of not affecting the luminous efficiency of the organic light-emitting device, so that it can effectively Improving the signal-to-noise ratio of the organic photodetection device is beneficial to obtain a better recognition effect.

Correspondingly, the prepared organic light-emitting display panel includes: an organic light-emitting device and an organic photodetection device integrated in the organic light-emitting device, the organic photodetection device is used to collect the light signal reflected by the user's biological features, such as the user's fingerprint, to obtain biological Feature sensing information. Wherein, the organic photodetection device shares the common layer of the organic light-emitting device, and the thickness of the exciton blocking layer of the organic photoelectric detection device is smaller than the thickness of the common layer of the organic light-emitting device. In an optional embodiment, grooves are provided at the target position of at least one common layer of the organic light-emitting device, the target position is the position where the organic photodetection device is integrated, and the bottom surface of each groove is on the positive side of the surface of the substrate. The projection at least partially overlaps the orthographic projection of the detection functional layer of the corresponding organic photodetection device on the surface of the base substrate. Wherein, at least one common layer may be an electron transport layer, or may also be other common layers.

In a third aspect, the embodiments of this specification further provide a brightness compensation method, which is applied to the organic light emitting display panel 100 provided in the first aspect. As shown in Figure 10, the method includes the following steps:

Step S110, acquiring the light-emitting luminance signal of the characteristic sub-pixels in each target sub-region;

Step S120: For each target sub-area, determine whether the light-emitting condition of the characteristic sub-pixels reaches a preset compensation condition based on the light-emitting luminance signal, and if so, perform luminance compensation on the corresponding characteristic sub-pixels in the target sub-area.

It should be noted that, for the specific implementation process of step S110 and step S120, reference may be made to the relevant description in the above-mentioned embodiment of the first aspect, and details are not repeated here. During specific implementation, the brightness compensation method may be performed by additionally adding an IC chip in the display device, or may also be performed in an original IC chip of the display device.

In a fourth aspect, as shown in FIG. 11 , an embodiment of the present specification further provides a display device 10 , including the organic light-emitting display panel 100 provided in the first aspect above. For example, the display device 10 may be a product or component with a display function, such as a mobile phone, a computer, a TV, and a wearable display device.

In the above description, the technical details such as the composition of each layer of the product are not described in detail. However, those skilled in the art should understand that various technical means can be used to form layers, regions, etc. of desired shapes. In addition, in order to form the same structure, those skilled in the art can also design methods that are not exactly the same as those described above. Although the various embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage.

In addition, those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope of the present disclosure is limited to these examples; within the spirit of the present disclosure, the above embodiments or different embodiments The technical features in can also be combined, the steps can be carried out in any order, and there are many other variations of the different aspects of one or more embodiments of this specification as described above, which are not provided in detail for the sake of brevity.

While the preferred embodiments of this specification have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of this specification.

Claims (13)

1. An organic light-emitting display panel, comprising a base substrate, and a display area of the display panel is divided into a plurality of target sub-areas, wherein each target sub-area comprises: at least one pixel unit, each pixel unit including a plurality of sub-pixels of different colors; and at least one organic photodetection device disposed on the base substrate, the organic photodetection device is used to collect the luminous intensity signal of the characteristic sub-pixel in the target sub-area, and the luminous intensity signal is used to determine the characteristic sub-pixel Whether the light-emitting condition of the pixel reaches the preset compensation condition, so as to perform brightness compensation on the corresponding characteristic sub-pixels in the target sub-region that reaches the preset compensation condition. 2 . The organic light emitting display panel according to claim 1 , wherein the number of pixel units included in each target sub-region is greater than or equal to four. 3 . 3. The organic light-emitting display panel according to claim 1, wherein the characteristic sub-pixel is a blue sub-pixel, and the organic photodetector is made of a blue light-absorbing material; or, The characteristic sub-pixel is a green sub-pixel, and the organic photodetector is made of a green light-absorbing material; or, The characteristic sub-pixel is a red sub-pixel, and the organic photodetector is made of a red light-absorbing material; or, The characteristic sub-pixels include: blue sub-pixels, green sub-pixels and red sub-pixels. 4 . The organic light emitting display panel according to claim 1 , wherein the organic photodetection device comprises: an anode, a cathode, a detection function layer, and a detection function layer disposed between the anode and the detection function layer and/or The exciton blocking layer between the cathode and the detection functional layer is used to prevent the excitons excited by the detection functional layer from diffusing to the electrode interface to be quenched. 5 . The organic light-emitting display panel according to claim 4 , wherein each sub-pixel has an organic light-emitting device disposed on the base substrate, and the organic light-emitting device comprises an anode, a cathode and a sandwiched The organic material between the anode and the cathode, the organic material includes a light-emitting layer and a common layer, the exciton blocking layer of the organic photodetection device shares the common layer of the organic light-emitting device, the excitons The thickness of the blocking layer in the direction perpendicular to the base substrate is smaller than the thickness of the common layer of the organic light emitting device. 6 . The organic light-emitting display panel according to claim 5 , wherein a target position of at least one common layer of the organic light-emitting device is provided with a groove, and the target position is a target position integrating the organic photoelectric detection device. 7 . position, the orthographic projection of the bottom surface of each groove on the surface of the base substrate at least partially overlaps with the orthographic projection of the detection functional layer of the corresponding organic photodetection device on the surface of the base substrate. 7. The organic light emitting display panel of claim 6, wherein the at least one common layer comprises an electron transport layer. 8. A method for manufacturing an organic light-emitting display panel, wherein a display area of the display panel is divided into a plurality of target sub-areas, and each target sub-area comprises: at least one pixel unit and at least one organic photodetector device , each pixel unit includes a plurality of sub-pixels of different colors, the organic photodetection device is used to collect the light-emitting brightness signal of the characteristic sub-pixel in the target sub-region, and the method includes: Provide a base substrate; A functional layer is formed on the base substrate, and a common layer shared by the organic photodetection device and the organic light-emitting device included in the sub-pixel is formed, wherein the functional layer includes: a light-emitting layer corresponding to each sub-pixel and The detection function layer of the organic photodetection device. 9 . The manufacturing method according to claim 8 , wherein the forming a common layer shared by the organic photodetector device and the organic light-emitting device included in the sub-pixel comprises: 10 . Each layer of the common layer is formed in sequence, and a groove is formed at a target position of at least one common layer, wherein the target position is the position where the detection function layer is formed, and the bottom surface of each groove is on the base substrate The orthographic projection of the surface at least partially overlaps the orthographic projection of the corresponding detection functional layer on the surface of the base substrate. 10. The manufacturing method according to claim 9, wherein the forming a groove at a target position of at least one common layer comprises: forming a first electron transport film layer covering the entire functional layer on the functional layer; A second electron transport film layer is formed on a region of the first electron transport film layer that does not cover the detection function layer through a mask, so as to form the groove in the electron transport layer included in the common layer. 11 . The manufacturing method according to claim 10 , wherein the thickness of the first electron transport film layer is 3˜8 nm, and the thickness of the second electron transport film layer is 20˜30 nm. 12 . 12. A brightness compensation method, characterized in that, when applied to an organic light-emitting display panel, the display area of the display panel is divided into a plurality of target sub-areas, and each target sub-area comprises: at least one pixel unit, each pixel The unit includes sub-pixels of multiple different colors, and the method includes: Obtain the luminous brightness signal of the characteristic sub-pixels in each target sub-region; For each target sub-area, it is determined based on the light-emitting luminance signal whether the light-emitting condition of the characteristic sub-pixel reaches a preset compensation condition, and if so, performs luminance compensation on the corresponding characteristic sub-pixel in the target sub-area. 13. A display device, comprising the organic light-emitting display panel according to any one of claims 1-7.

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