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

Abstract

The application discloses a display panel, a manufacturing method thereof, a brightness compensation method and a display device. The display panel comprises a substrate, and a display area of the display panel is divided into a plurality of target sub-areas. Each target sub-area comprises at least one pixel unit and at least one organic photoelectric detection device arranged on the substrate. Each pixel unit comprises a plurality of sub-pixels of different colors. The organic photoelectric detection device is used to collect a light-emitting brightness signal of a characteristic sub-pixel in the target sub-area, to determine whether the light-emitting condition of the characteristic sub-pixel meets a preset compensation condition, and to perform brightness compensation on the corresponding characteristic sub-pixel in the target sub-area meeting the preset compensation condition. In this way, the brightness attenuation of the characteristic sub-pixel in each sub-area can be compensated in time, and the problem of uneven display brightness can be improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display panel and its manufacturing method, a brightness compensation method, and a display device. Background Technology

[0002] In OLED (Organic Light-Emitting Diode) displays, due to device characteristic drift and EL (Emitting Layer) material aging, EL display devices are more prone to changes in display brightness after prolonged high-brightness operation, which can lead to uneven display or even mura.

[0003] Conventional display devices use external or internal compensation threshold voltage (Vth) to improve device drift. However, after long-term operation, the device's Vth is no longer the only factor affecting the EL current. Furthermore, the aging of the EL material itself, especially the differences in aging of RGB pixel materials, cannot be eliminated by conventional external or internal compensation. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a display panel that overcomes or at least partially solves the above problems, a method for manufacturing the same, a brightness compensation method, and a display device.

[0005] In a first aspect, embodiments of this specification provide an organic light-emitting display panel, including a substrate, wherein the display area of ​​the display panel is divided into multiple target sub-regions, wherein each target sub-region includes:

[0006] At least one pixel unit, each pixel unit comprising multiple sub-pixels of different colors;

[0007] At least one organic photodetector is disposed on the substrate. The organic photodetector is used to collect the luminance signal of the feature sub-pixel in the target sub-region. The luminance signal is used to determine whether the luminance of the feature sub-pixel meets the preset compensation condition, so as to perform luminance compensation on the corresponding feature sub-pixel in the target sub-region that meets the preset compensation condition.

[0008] Furthermore, each target sub-region contains four or more pixel units.

[0009] Further, the feature sub-pixel is a blue sub-pixel, and the organic photodetector is made of a blue light-absorbing material; or, the feature sub-pixel is a green sub-pixel, and the organic photodetector is made of a green light-absorbing material; or, the feature sub-pixel is a red sub-pixel, and the organic photodetector is made of a red light-absorbing material; or, the feature sub-pixel includes: a blue sub-pixel, a green sub-pixel, and a red sub-pixel.

[0010] Furthermore, the organic photodetector includes: 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 exciton blocking layer is used to prevent excitons excited by light from the detection functional layer from diffusing to the electrode interface and quenching.

[0011] Furthermore, each sub-pixel has an organic light-emitting device disposed on the substrate. The organic light-emitting device includes an anode, a cathode, and an organic material sandwiched 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 photodetector shares the common layer of the organic light-emitting device. The thickness of the exciton blocking layer in the direction perpendicular to the substrate is less than the thickness of the common layer of the organic light-emitting device.

[0012] Furthermore, a groove is provided at the target position of at least one common layer of the organic light-emitting device, the target position being the position where the organic photodetector is integrated, and the orthographic projection of the bottom surface of each groove on the substrate surface at least partially overlaps with the orthographic projection of the detection function layer of the corresponding organic photodetector on the substrate surface.

[0013] Furthermore, the at least one common layer includes an electronic transmission layer.

[0014] Secondly, embodiments of this specification also provide a method for manufacturing an organic light-emitting display panel. The display area of ​​the display panel is divided into multiple target sub-regions, each target sub-region including: at least one pixel unit and at least one organic photodetector. Each pixel unit includes multiple sub-pixels of different colors. The organic photodetector is used to collect the luminance signal of the characteristic sub-pixels in its target sub-region. The method includes:

[0015] Provide substrates;

[0016] A functional layer is formed on the substrate, and a common layer is formed for the organic photodetector and the organic light-emitting device contained in the sub-pixel. The functional layer includes a light-emitting layer corresponding to each sub-pixel and a detection functional layer of the organic photodetector.

[0017] Further, the common layer formed for the organic photodetector and the organic light-emitting device included in the sub-pixel includes:

[0018] Each of the common layers is formed sequentially, 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 functional layer is formed, and the orthographic projection of the bottom surface of each groove on the substrate surface at least partially overlaps with the orthographic projection of the corresponding detection functional layer on the substrate surface.

[0019] Further, forming a groove at a target location in at least one common layer includes:

[0020] A first electron transport film layer covering the entire functional layer is formed on the functional layer;

[0021] Using a mask, a second electron transport film layer is formed in the area of ​​the first electron transport film layer that does not cover the detection function layer, so as to form the groove in the electron transport layer included in the common layer.

[0022] Furthermore, the thickness of the first electron transport film is 3-8 nm, and the thickness of the second electron transport film is 20-30 nm.

[0023] Thirdly, embodiments of this specification provide a brightness compensation method applied to an organic light-emitting display panel. The display area of ​​the display panel is divided into multiple target sub-regions, each target sub-region including at least one pixel unit, each pixel unit including multiple sub-pixels of different colors. The method includes:

[0024] Acquire the luminance signal of the feature sub-pixels in each target sub-region;

[0025] For each target sub-region, based on the emission brightness signal, it is determined whether the emission status of the feature sub-pixel meets the preset compensation condition. If so, brightness compensation is performed on the corresponding feature sub-pixel in the target sub-region.

[0026] Fourthly, embodiments of this specification provide a display device including the organic light-emitting display panel described in the first aspect above.

[0027] The technical solutions provided in the embodiments of this specification have at least the following technical effects or advantages:

[0028] The display panel, its manufacturing method, brightness compensation method, and display device provided in the embodiments of this specification divide the display area of ​​the organic light-emitting display panel into multiple target sub-regions. Each target sub-region includes at least one pixel unit and at least one organic photodetector. The organic photodetector collects the luminance signal of the feature sub-pixels in its target sub-region to determine whether the luminance of the feature sub-pixels meets a preset compensation condition. Brightness compensation is then performed on the corresponding feature sub-pixels in the target sub-regions that meet the preset compensation condition. This enables regional brightness self-detection, which is beneficial for timely compensation of brightness attenuation of feature sub-pixels in each sub-region, improving uneven display brightness and even preventing mura problems, thereby achieving better display effects and improving user experience.

[0029] The above description is merely an overview of the technical solutions provided in the embodiments of this specification. In order to better understand the technical means of the embodiments of this specification and to implement them in accordance with the content of the specification, and to make the above and other objects, features and advantages of the embodiments of this specification more apparent and understandable, specific implementation methods of the embodiments of this specification are described below. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of an organic light-emitting display panel provided in the first aspect of the embodiments of this specification;

[0032] Figure 2 This is a schematic diagram of the layout of organic photodetectors in the embodiments of this specification. Figure 1 ;

[0033] Figure 3 This is a schematic diagram of the layout of organic photodetectors in the embodiments of this specification. Figure 2 ;

[0034] Figure 4 This is a schematic diagram of the layout of organic photodetectors in the embodiments of this specification. Figure 3 ;

[0035] Figure 5 This is a schematic diagram of the layout of organic photodetectors in the embodiments of this specification. Figure 4 ;

[0036] Figure 6 A flowchart illustrating a method for manufacturing an organic light-emitting display panel, provided as a second aspect of the embodiments of this specification;

[0037] Figure 7 A schematic diagram showing the functional layer after vapor deposition;

[0038] Figure 8 A schematic diagram showing the result after the first electron transport film layer has been deposited.

[0039] Figure 9 A schematic diagram showing the result after the second electron transport film layer has been deposited.

[0040] Figure 10 A flowchart illustrating a brightness compensation method provided in the third aspect of the embodiments of this specification;

[0041] Figure 11 This is a schematic diagram of the structure of the display device provided in the fourth aspect of the embodiments of this specification. Detailed Implementation

[0042] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. It should be noted that the dimensions of layers and regions may be exaggerated in the drawings 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 implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0043] Firstly, such as Figure 1 As shown in the figure, this embodiment of the specification provides an organic light-emitting display panel, which includes a substrate (not shown). The display area of ​​the display panel 100 is divided into a plurality of target sub-regions 110. Each target sub-region 110 includes at least one pixel unit 101 and at least one organic photodetector 102 disposed on the substrate. It should be noted that... Figure 1 The division of the target sub-region 110 and the distribution of pixel units 101 and organic photodetectors 102 in the target sub-region 110 shown are for illustrative purposes only and are not intended to be limiting. By setting organic photodetectors 102 in each target sub-region 110 respectively, regional brightness self-detection can be achieved.

[0044] For ease of management, each target sub-region 110 can be numbered during implementation. For example, the target sub-regions 110 can be distributed in an array, numbered as (x, y), where x represents the row and y represents the column. For instance, if the panel display area is divided into 4*4 target sub-regions 110, the target sub-region 110 located in the first row and first column can be numbered (1, 1), the target sub-region 110 located in the first row and second column can be numbered (1, 2), and so on.

[0045] Specifically, the specific division method of the target sub-region 110 and the detection pixel density, i.e. the setting density of the organic photodetector device 102, can be determined according to actual needs, and this embodiment does not impose any restrictions on this.

[0046] For example, such as Figure 2 As shown, an organic photodetector 102 can be set for each pixel unit 101 to perform brightness detection, achieving fine adjustment. However, since the organic photodetector 102 itself needs to occupy a certain space, and considering that excessively high detection pixel density will lead to a significant decrease in aperture ratio, in an optional embodiment, the number of pixel units 101 contained in each target sub-region 110 can be greater than or equal to four. In this way, an organic photodetector 102 can be set for every four or more pixel units, so as to meet the aperture ratio requirements while achieving better detection effect.

[0047] Furthermore, in an optional implementation, considering the significant brightness difference in the edge region of the display panel, the target sub-regions 110 located at the edge and central regions of the panel can be differentiated. For example, the number of pixel units 101 contained in the edge target sub-region can be less than the number of pixel units 101 contained in the central target sub-region, that is, the detection pixel density in the edge region is relatively larger. This allows for more refined brightness compensation in the edge region, which is beneficial to improving the accuracy of brightness compensation and better addressing the problem of uneven display brightness.

[0048] In this embodiment, each pixel unit 101 includes multiple sub-pixels of different colors, such as red sub-pixels (R), green sub-pixels (G), and blue sub-pixels (B). The specific sub-pixel colors and pixel arrangement of a single pixel unit 101 can be determined according to the actual application scenario. The organic photodetector 102 is used to collect the luminance signals of the characteristic sub-pixels in the target sub-region 110. As one implementation, the organic photodetector 102 can be an organic photodiode (OPD).

[0049] Furthermore, the emission brightness signal collected by the organic photodetector 102 is used to determine whether the emission status of the feature sub-pixels meets the preset compensation conditions, so as to perform brightness compensation on the corresponding feature sub-pixels in the target sub-region 110 that meet the preset compensation conditions. The feature sub-pixels can be one or more of the aforementioned various color sub-pixels. The preset compensation conditions can be pre-configured according to the needs of the actual application scenario and are used to measure whether the feature sub-pixels have experienced brightness drift. That is, if the emission status of the feature sub-pixels in the target sub-region 110 is detected to meet the preset compensation conditions, it indicates that the feature sub-pixels in the target sub-region 110 have experienced brightness drift, and therefore brightness compensation is required for all corresponding color sub-pixels in the target sub-region 110.

[0050] In practice, the feature sub-pixels can be determined according to the needs of the actual application scenario. In one optional implementation, the feature sub-pixels can be sub-pixels of a single color, such as blue sub-pixels, red sub-pixels, or green sub-pixels.

[0051] For example, considering that blue sub-pixels are more prone to aging, the luminescence of some blue sub-pixels in each target sub-region 110 can be detected, i.e., the feature sub-pixels are blue sub-pixels, and the organic photodetector 102 is made of blue light-absorbing material. For example, such as Figure 3 As shown, an organic photodetector 102 made of blue light-absorbing material can be placed near several specific blue sub-pixels (three blue sub-pixels are used as an example in the figure) in each target sub-region 110. These blue sub-pixels are then considered characteristic sub-pixels. The organic photodetector 102 collects the luminance signals of these blue sub-pixels to perform luminance self-detection on each target sub-region 110, thereby compensating for luminance drift in blue sub-pixels in different regions. It should be noted that this embodiment does not limit the specific placement of the organic photodetector 102 within its respective target sub-region 110. The placement is determined based on the layout of the sub-pixels and the aperture ratio requirements within the target sub-region 110, as long as the luminance of the corresponding characteristic sub-pixels can be detected.

[0052] Of course, in other embodiments of this specification, the luminescence of some green sub-pixels in each target sub-region 110 can also be detected as needed, that is, the feature sub-pixels can also be green sub-pixels, and accordingly, the organic photodetector 102 is made of green light-absorbing material. For example, as Figure 4As shown, an organic photodetector 102 made of green light-absorbing material can be placed near several specific green sub-pixels (6 green sub-pixels are used as an example in the figure) in each target sub-region 110. These green sub-pixels are then the feature sub-pixels. The luminance signals of these green sub-pixels are collected by the organic photodetector 102 to perform brightness self-detection on each target sub-region 110, thereby compensating for brightness drift in green sub-pixels in different regions. Similarly, as... Figure 5 As shown, the light emission of some red sub-pixels in each target sub-region 110 can also be detected as needed, that is, the feature sub-pixels can also be red sub-pixels. Accordingly, the organic photodetector 102 is made of red light-absorbing material.

[0053] In an optional implementation, the feature sub-pixels may also include sub-pixels of multiple colors. In this case, brightness compensation needs to be specifically applied to the sub-pixels whose luminescence meets the preset compensation conditions. For example, in one application scenario, compensation detection can be performed on the three-color sub-pixels of each target sub-region 110. That is, the feature sub-pixels include red, green, and blue sub-pixels. The organic photodetector 102 set in each target sub-region 110 can detect the luminescence brightness signals of the red, green, and blue sub-pixels in its respective target sub-region 110. This allows for separate compensation for the drift of each color, thus compensating not only for the brightness drift of the target sub-region 110 but also for the color drift, which helps to better ensure the display effect.

[0054] 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, trapezoid, square, or a symmetrical polygon such as a rhombus or hexagon. This embodiment does not limit this.

[0055] Specifically, after acquiring the luminance signal of the feature sub-pixel, there are various ways to determine whether the luminance meets the preset compensation conditions. For example, taking a single-color sub-pixel as an example, the reference luminance value collected by the organic photodetector 102 in each target sub-region 110 under normal conditions can be pre-stored. Based on this, the display device can respond to the trigger command of the luminance compensation function and compare the measured luminance value detected by the organic photodetector 102 with the corresponding reference luminance value for each target sub-region 110. If the luminance difference exceeds the preset error range, it indicates that the feature sub-pixel of the target sub-region 110 has luminance drift, thereby determining that the luminance meets the preset compensation conditions. If the luminance difference is within the preset error range, it is determined that the luminance of the target sub-region 110 does not meet the preset compensation conditions.

[0056] Similarly, in scenarios where the feature sub-pixels include multiple color sub-pixels, such as those containing red, green and blue sub-pixels, the reference brightness values ​​of the three-color feature sub-pixels collected by the organic photodetector device 102 in each target sub-region 110 under normal conditions can be pre-stored, thereby determining whether the luminescence of each feature sub-pixel meets the preset compensation conditions.

[0057] Furthermore, after clarifying the brightness difference between the measured brightness value and the corresponding reference brightness value, for the target sub-region 110 that meets the preset compensation conditions, the state of the corresponding feature sub-pixels under different gray levels can be compensated based on the brightness difference and the preset gray level data table. For the specific principle, please refer to the relevant technology, which will not be detailed here.

[0058] It should be noted that brightness compensation itself has limitations. For example, a compensation upper limit can be set based on the actual brightness compensation capability of the panel. If the brightness difference of the target sub-region 110 exceeds the compensation upper limit, the brightness difference needs to be multiplied by an appropriate compensation coefficient to obtain the required compensation amount. Then, the corresponding feature sub-pixels are compensated for at different gray levels according to the obtained compensation amount; otherwise, the compensation will not take effect. Of course, if the brightness difference of the target sub-region 110 does not exceed the compensation upper limit, the brightness difference can be used as the compensation amount to compensate the brightness of the corresponding feature sub-pixels.

[0059] The compensation coefficient takes a value greater than 0 and less than 1. For example, a compensation coefficient sequence can be pre-set, which contains multiple candidate compensation coefficients that descend along the gradient. First, the brightness difference is multiplied by the largest candidate compensation coefficient, such as 0.95. If the compensation amount after multiplying by 0.95 meets the compensation upper limit requirement, then the compensation amount can be executed according to that amount. If it does not meet the requirement, the brightness difference is multiplied by the second largest candidate compensation coefficient, such as 0.9, and so on, until an appropriate compensation coefficient is selected to obtain a compensation amount that does not exceed the compensation upper limit, that is, to make the compensation as effective as possible, while making the compensation of each target sub-region 110 as uniform as possible.

[0060] The organic light-emitting display panel 100 provided in this embodiment combines an organic photodetector 102 and an organic light-emitting device. By dividing the display area of ​​the panel into multiple target sub-regions 110, and setting an organic photodetector 102 in each sub-region to monitor the light emission of that sub-region, it is beneficial to compensate for the brightness decay of the characteristic sub-pixels of each sub-region in a timely manner, improve the problem of uneven display brightness or even the occurrence of Mura, and thus obtain a better display effect.

[0061] Furthermore, it can be understood that the hierarchical structure of the organic photodetector 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, i.e. electron-hole pairs, under illumination, and the exciton blocking layer is used to prevent the excitons excited by the detection functional layer from diffusing to the electrode interface and quenching.

[0062] For example, taking an OPD as an example, along the direction perpendicular to the substrate, the layered structure of the OPD from bottom to top can be: anode, hole transport layer, detection functional layer, electron transport layer, and cathode. The detection functional layer includes a donor layer and an acceptor layer, and the exciton blocking layer can include a hole transport layer and an electron transport layer. For example, the thickness of the anode can be 100 nm, the hole transport layer can be 100 nm, the donor layer can be 15 nm, the acceptor layer can be 45 nm, the electron transport layer can be 10 nm, and the cathode can be 80 nm.

[0063] Unlike OLEDs, OPDs primarily absorb external light, exciting electron-hole pairs (called excitons) in the donor and acceptor layers. These excitons are then split into electrons and holes, which are attracted to the electrodes on either side, becoming part of the current. This results in a significant modulation of the photodiode current by illumination. During exciton diffusion, both excessively fast and slow diffusion rates can affect this modulation. Exciton quenching at the electrode interface leads to exciton waste. Adding an exciton-blocking layer can, to some extent, prevent exciton diffusion to the electrode interface, avoiding quenching waste and improving exciton separation efficiency. However, the exciton-blocking layer cannot be too thick, otherwise it will affect electron and hole diffusion.

[0064] Each sub-pixel of the organic light-emitting display panel 100 has an organic light-emitting device disposed on a substrate. The organic light-emitting device includes an anode, a cathode, and organic material sandwiched between the anode and cathode. The organic material mainly consists of two parts: a light-emitting layer and a common layer. For example, in the currently used multilayer device structure, the common layer can be subdivided into: a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). The specific subdivision of the common layer can be determined according to the organic light-emitting device structure used in the actual application scenario.

[0065] To facilitate the detection of the emission status of feature sub-pixels, in this embodiment, the organic photodetector 102 disposed in each target sub-region 110 can be integrated into the organic light-emitting device (OLED). That is, the exciton blocking layer of the organic photodetector 102 can share the common layer of the OLED. In other words, the exciton blocking layer and the common layer of the OLED contain the same film material, and the specific layer 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 OLED is also subdivided into a hole transport layer and an electron transport layer, which can then be shared.

[0066] However, existing organic light-emitting devices (OLEDs) are designed for the purpose of emitting light, so their film layer configuration is obviously primarily aimed at this purpose. In this case, the film layer of the organic photodetector 102 is generally difficult to perfectly match with the OLED, and the differences are often quite large in practice. Research has found that in practical applications, due to the limitations of the integrated OLED, the efficiency of the organic photodetector 102 is reduced by the influence of the original OLED's film layer. In particular, when the exciton blocking layer is too thick, it will significantly block the transfer of electrons from the active layer to the cathode, resulting in photocurrent loss and severely affecting the external quantum efficiency (EQE).

[0067] Experiments have shown that adjusting the exciton blocking layer thickness from 30 nm to 5 nm can increase the photocurrent density from 2.52E-4 to 2.70E-4, as shown in Table 1. This demonstrates that properly adjusting the exciton blocking layer can effectively increase the photocurrent density and thus improve the EQE (experiments have shown that it can be increased from 28% to 41.7%).

[0068] Table 1

[0069]

[0070] Therefore, in one optional embodiment, by optimizing the film layer process of the integrated device, the thickness of the exciton blocking layer in the organic photodetector 102 of the organic light-emitting display panel 100 provided in this embodiment is less than the thickness of the common layer of the organic light-emitting device in the direction perpendicular to the substrate. This enables the integrated organic photodetector 102 to achieve higher efficiency, effectively improves the signal-to-noise ratio of the organic photodetector 102, and significantly enhances the EQE, thereby improving the accuracy of the brightness detection and further improving the accuracy of brightness compensation.

[0071] In one optional embodiment, a groove is provided at a target location of at least one common layer of the organic light-emitting device (OLED), the target location being the location of the integrated organic photodetector 102. The orthographic projection of the bottom surface of each groove onto the substrate surface at least partially overlaps with the orthographic projection of the detection functional layer of the corresponding organic photodetector 102 onto the substrate surface. It should be noted that, in this context, "at least partially overlap" can include either a portion of the two orthographic projection regions overlapping, or the two orthographic projection regions completely coinciding. This ensures that the thickness of the common layer of the OLED remains constant, allowing the exciton blocking layer thickness of the organic photodetector 102 to be appropriately reduced, thereby achieving higher efficiency for the organic photodetector 102 without affecting the luminous efficiency of the OLED (EL) device.

[0072] For example, during the formation of the common layer of the organic light-emitting device, the aforementioned groove can be formed at the target location of at least one common layer using a mask such as an OPEN Mask or an FMM (Fine Metal Mask) to appropriately reduce the thickness of the exciton blocking layer of the organic photodetector 102.

[0073] To further reduce process complexity, in one optional embodiment, the aforementioned groove can be formed at the target location of the electron transport layer. For example, during panel fabrication, after depositing the red, green, and blue light-emitting units and the detection functional layer of the organic photodetector 102, when continuing to deposit the electron transport layer, a 3-8 nm electron transport film layer can be pre-deposited; this film layer is a full-layer deposition. Then, using an OPEN Mask or FMM, another electron transport film layer is deposited on the area of ​​this film layer that does not cover the detection functional layer, with a deposition thickness of approximately 20-30 nm. In this way, the aforementioned groove structure can be formed at the target location of the electron transport layer, and the groove depth is 20-30 nm, which means the exciton blocking layer thickness is reduced by 20-30 nm.

[0074] Of course, in other embodiments of this specification, the above-mentioned grooves may also be provided at target locations in other common layers such as hole injection layers, hole transport layers or electron injection layers as needed, and this embodiment does not limit this.

[0075] Secondly, embodiments of this specification also provide a method for manufacturing an organic light-emitting display panel, such as... Figure 6 As shown, the manufacturing method may include at least the following steps S601 and S602.

[0076] Step S601: Provide a substrate.

[0077] It is understood that the substrate may include an array substrate, an anode formed on the surface of the array substrate, and related film layers that need to be set between the array substrate and the anode. For specific structures and processes, please refer to the relevant technologies of organic light-emitting display panels, which will not be detailed here.

[0078] Step S602: A functional layer is formed on the substrate, and a common layer shared by the organic photodetector and the organic light-emitting device contained in the sub-pixel is formed. The functional layer includes: a light-emitting layer corresponding to each sub-pixel and a detection functional layer of the organic photodetector.

[0079] The specific common layer is determined based on the structure of the organic light-emitting device (OLED) used in the actual application scenario. For example, the common layer of an OLED can be further divided 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 the light-emitting layer corresponding to the red sub-pixel (red light-emitting layer), the light-emitting layer corresponding to the green sub-pixel (green light-emitting layer), and the light-emitting layer corresponding to the blue sub-pixel (blue light-emitting layer).

[0080] Accordingly, the exciton blocking layer of the organic photodetector also includes a hole transport layer and an electron transport layer. The detection functional layer generally includes a donor layer and an acceptor layer, as described in the relevant description in the first aspect embodiment above. Thus, the organic photodetector can share the cathode, anode, and common layers of the organic light-emitting device, namely the hole transport layer and the electron transport layer.

[0081] In one optional embodiment, the process of forming a common layer shared by the organic photodetector and the organic light-emitting device included in the sub-pixel may include: sequentially forming each common layer, and forming a groove at a target location in at least one common layer, wherein the target location is the location where the detection functional layer is formed, and the orthographic projection of the bottom surface of each groove on the substrate surface at least partially overlaps with the orthographic projection of the corresponding detection functional layer on the substrate surface. This allows for a reduction in the thickness of the exciton blocking layer of the integrated organic photodetector without affecting the luminous efficiency of the organic light-emitting device (EL device), thereby enabling the integrated organic photodetector to achieve higher efficiency and effectively improving the signal-to-noise ratio and EQE of the organic photodetector.

[0082] In practical implementation, to further reduce process complexity, the aforementioned at least one common layer can be an electron transport layer formed on a functional layer. Of course, in other embodiments of this specification, the aforementioned grooves can also be set at target positions on other common layers such as hole injection layers, hole transport layers, or electron injection layers, depending on the actual device structure and the thickness of the exciton blocking layer. This embodiment does not impose any restrictions on this.

[0083] Specifically, the process of forming a groove at the target location of the electron transport layer may include: after forming the functional layer, forming a first electron transport film layer covering the entire functional layer in advance; then, through a mask, forming a second electron transport film layer in the area of ​​the first electron transport film layer that does not cover the detection functional layer, so as to form a groove in the electron transport layer contained in the common layer.

[0084] For ease of understanding, please refer to the following: Figures 7 to 9 Taking the exciton blocking layer as an example of the hole transport layer and electron transport layer of the organic light-emitting device, an exemplary process for fabricating a display panel is described.

[0085] First, the back panel fabrication and pre-evaporation treatment of the panel are completed normally, that is, the substrate 210 is provided.

[0086] Then, the hole transport layer 220 and the functional layer 230, located between the anode (not shown) and the functional layer, are sequentially deposited on the 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 functional layer 234 for the organic photodetector. At this time, the red light-emitting layer 231, the green light-emitting layer 232, the blue light-emitting layer 233, and the detection functional layer 234 are located in the same layer, as shown below. Figure 7 As shown.

[0087] Next, the electron transport layer 240 is deposited by evaporation. An electron transport film layer of approximately 3–8 nm is pre-deposited; this pre-deposited film layer can be referred to as the first electron transport film layer 241. This film layer is a full-layer evaporation. Figure 8 As shown; then, a second evaporation of the electron transport film 240 is performed: using an OPEN Mask or FMM, the electron transport film is deposited in the area outside the organic photodetector pattern on the first electron transport film 241, i.e., the area not covered by the detection function layer 234. This deposited film can be called the second electron transport film 242, and its thickness can be approximately 20-30 nm, thus completing the patterned electron transport layer 240, i.e., the groove 243 formed at the target position of the electron transport layer 240, such as... Figure 9 As shown. This integrated organic photodetector not only allows the shared layer of the organic light-emitting device (OLED) but also reduces the thickness of the exciton blocking layer without affecting the thickness of the shared OLED layer. It should be noted that... Figure 9 The area filled with diagonal lines in the diagram illustrates the exciton blocking layer of the organic photodetector in this example. Its thickness in the direction perpendicular to the substrate (i.e., the total thickness of the hole transport layer 220 and the first electron transport film layer 241) is less than the thickness of the common layer of the organic light-emitting device (i.e., the total thickness of the hole transport layer 220 and the electron transport layer 240).

[0088] Furthermore, the evaporation of other common layers up to the cathode can be carried out, and the evaporation of other integrated devices can be completed. For details, please refer to the relevant technology, which will not be elaborated here.

[0089] It should be noted that the method for fabricating an organic light-emitting display panel provided in the second aspect above can be applied to the fabrication of organic light-emitting display panels that require the integration of organic photodetectors in an organic light-emitting device, i.e., an OLED. In one application scenario, it can be used to fabricate the organic light-emitting display panel provided in the first aspect above. In this case, in step S602 above, the distribution of the detection functional layer is determined according to the placement position of the organic photodetectors 102 in each target sub-region 110 of the panel, and the material of the detection functional layer 234 is determined according to the feature sub-pixels to be detected.

[0090] Furthermore, it is understandable that the performance of organic photodetectors, such as organic photodiodes (OPDs), has now advanced to the point where they can offer more functionality than traditional silicon photodiodes, particularly in applications such as biomedical imaging and biometric monitoring. Other potential applications include human-machine interfaces, such as contactless gesture recognition and control, and fingerprint recognition. Therefore, integrating organic photodetectors into the organic light-emitting diodes (OLEDs) of display panels can enable in-screen fingerprinting and other biometric functions.

[0091] Therefore, in another application scenario, the method for manufacturing an organic light-emitting display panel provided in the second aspect above can also be used to manufacture an organic light-emitting display panel with in-screen fingerprint and other biometric functions. In this case, in step S602, the distribution of the detection function layer 234 is determined according to the placement of the in-screen fingerprint and other biometric function modules, and the material of the detection function layer 234 is adapted to the wavelength of the corresponding sensing light source. The above manufacturing method, through a regional patterning scheme, appropriately adjusts the thickness of the exciton blocking layer in the organic photodetector, enabling it to achieve higher efficiency without affecting the luminous efficiency of the organic light-emitting device. This effectively improves the signal-to-noise ratio of the organic photodetector, leading to better recognition results.

[0092] Accordingly, the fabricated organic light-emitting display panel includes: an organic light-emitting device and an organic photodetector integrated within the organic light-emitting device. The organic photodetector is used to collect light signals reflected from user biometrics, such as user fingerprints, to obtain biometric sensing information. The organic photodetector shares a common layer with the organic light-emitting device, and the thickness of the exciton blocking layer of the organic photodetector is less than the thickness of the common layer. In an optional embodiment, a groove is provided at a target location of at least one common layer of the organic light-emitting device. The target location is the location where the organic photodetector is integrated. The orthographic projection of the bottom surface of each groove onto the substrate surface at least partially overlaps with the orthographic projection of the detection function layer of the corresponding organic photodetector onto the substrate surface. The at least one common layer can be an electron transport layer, or other common layers.

[0093] Thirdly, embodiments of this specification also provide a brightness compensation method applied to the organic light-emitting display panel 100 provided in the first aspect above. For example... Figure 10 As shown, the method includes the following steps:

[0094] Step S110: Obtain the luminance signal of the feature sub-pixel in each target sub-region;

[0095] Step S120: For each target sub-region, determine whether the luminance of the feature sub-pixel meets the preset compensation condition based on the luminance signal. If so, perform luminance compensation on the corresponding feature sub-pixel in the target sub-region.

[0096] It should be noted that the specific implementation process of steps S110 and S120 can be referred to the relevant description in the first aspect embodiment above, and will not be repeated here. In specific implementation, the brightness compensation method can be implemented by adding an additional IC chip to the display device, or it can be implemented in the original IC chip of the display device.

[0097] Fourthly, such as Figure 11 As shown, this embodiment of the specification also 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 can be a product or component with display function, such as a mobile phone, computer, television, or wearable display device.

[0098] The above description does not provide detailed technical specifications regarding the layout of each layer of the product. However, those skilled in the art should understand that layers and regions of the desired shape can be formed using various technical means. Furthermore, to form the same structure, those skilled in the art can also design methods that are not entirely identical to those described above. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination.

[0099] Furthermore, those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this specification as described above, which are not provided in detail for the sake of brevity.

[0100] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

Claims

1. An organic light-emitting display panel, characterized in that, Including a substrate, the display area of ​​the display panel is divided into multiple target sub-regions, wherein each target sub-region includes: At least one pixel unit, each pixel unit comprising multiple sub-pixels of different colors; and At least one organic photodetector is disposed on the substrate. The organic photodetector is used to collect the luminance signal of the feature sub-pixel in the target sub-region. The luminance signal is used to determine whether the luminance of the feature sub-pixel meets the preset compensation condition, so as to perform luminance compensation on the corresponding feature sub-pixel in the target sub-region that meets the preset compensation condition. The organic photodetector includes: an anode, a cathode, and a detection functional layer, wherein the detection functional layer is disposed between the anode and the cathode; Each sub-pixel has an organic light-emitting device disposed on the substrate. The organic light-emitting device includes an anode, a cathode, and a light-emitting layer and a common layer sandwiched between the anode and the cathode. The organic photodetector is disposed on the same side of the substrate as the organic light-emitting device. The anode of the organic photodetector is disposed in the same layer as the anode of the organic light-emitting device, and the cathode of the organic photodetector is disposed in the same layer as the cathode of the organic light-emitting device. The organic photodetector further includes an exciton blocking layer disposed between the anode and the detection functional layer and / or between the cathode and the detection functional layer. The exciton blocking layer is used to prevent excitons excited by light from the detection functional layer from diffusing to the electrode interface and quenching. The exciton blocking layer and the common layer of the organic light-emitting device contain the same film material. The thickness of the exciton blocking layer in the direction perpendicular to the substrate is less than the thickness of the common layer of the organic light-emitting device. The common layer of the light-emitting device includes a hole transport layer, a first electron transport film layer, and a second electron transport film layer. The exciton blocking layer of the organic photodetector includes a hole transport layer and a first electron transport film layer, but does not include a second electron transport film layer. The thickness of the first electron transport film layer is 3 to 8 nm, and the thickness of the second electron transport film layer is 20 to 30 nm.

2. The organic light-emitting display panel according to claim 1, characterized in that, Each target sub-region contains four or more pixel units.

3. The organic light-emitting display panel according to claim 1, characterized in that, 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 feature sub-pixels include: blue sub-pixels, green sub-pixels, and red sub-pixels.

4. The organic light-emitting display panel according to claim 1, characterized in that, The exciton blocking layer of the organic photodetector device shares the common layer of the organic light-emitting device.

5. The organic light-emitting display panel according to claim 4, characterized in that, At least one common layer of the organic light-emitting device has a groove at a target location, which is the location where the organic photodetector is integrated. The orthographic projection of the bottom surface of each groove on the substrate surface at least partially overlaps with the orthographic projection of the detection function layer of the corresponding organic photodetector on the substrate surface.

6. The organic light-emitting display panel according to claim 5, characterized in that, The at least one common layer includes an electronic transmission layer.

7. A method for manufacturing an organic light-emitting display panel, characterized in that, The display area of ​​the display panel is divided into multiple target sub-regions. Each target sub-region includes at least one pixel unit and at least one organic photodetector. Each pixel unit includes multiple sub-pixels of different colors. The organic photodetector includes an anode, a cathode, and a detection functional layer, with the detection functional layer disposed between the anode and the cathode. Each sub-pixel has an organic light-emitting device disposed on a substrate. The organic light-emitting device includes an anode, a cathode, and a light-emitting layer sandwiched between the anode and the cathode. The organic photodetector is used to collect the luminance signal of the characteristic sub-pixels in its target sub-region. The method includes: A substrate is provided, the substrate comprising an array substrate and an anode layer formed on one side of the array substrate, the anode layer comprising the anode of the organic photodetector and the anode of the organic light-emitting device; A functional layer is formed on the substrate, and a common layer shared by the organic photodetector and the organic light-emitting device included in the sub-pixel is formed. The functional layer includes a light-emitting layer corresponding to each sub-pixel and a detection functional layer for the organic photodetector. The exciton blocking layer of the organic photodetector and the common layer of the organic light-emitting device contain the same film material. The thickness of the exciton blocking layer in the direction perpendicular to the substrate is less than the thickness of the common layer of the organic light-emitting device. The common layer of the light-emitting device includes a hole transport layer, a first electron transport film layer, and a second electron transport film layer. The exciton blocking layer of the organic photodetector includes a hole transport layer and a first electron transport film layer, but does not include the second electron transport film layer. The thickness of the first electron transport film layer is 3 to 8 nm, and the thickness of the second electron transport film layer is 20 to 30 nm.

8. The manufacturing method according to claim 7, characterized in that, The common layer formed by the organic photodetector and the organic light-emitting device contained in the sub-pixel includes: Each of the common layers is formed sequentially, 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 functional layer is formed, and the orthographic projection of the bottom surface of each groove on the substrate surface at least partially overlaps with the orthographic projection of the corresponding detection functional layer on the substrate surface.

9. The manufacturing method according to claim 8, characterized in that, The process of forming a groove at a target location in at least one common layer includes: A first electron transport film layer covering the entire functional layer is formed on the functional layer; Using a mask, a second electron transport film layer is formed in the area of ​​the first electron transport film layer that does not cover the detection function layer, so as to form the groove in the electron transport layer included in the common layer.

10. A brightness compensation method, characterized in that, An organic light-emitting display panel according to any one of claims 1-6, wherein the display area of ​​the display panel is divided into multiple target sub-regions, each target sub-region comprising: at least one pixel unit, each pixel unit comprising multiple sub-pixels of different colors, the method comprising: Acquire the luminance signal of the feature sub-pixels in each target sub-region; For each target sub-region, based on the emission brightness signal, it is determined whether the emission status of the feature sub-pixel meets the preset compensation condition. If so, brightness compensation is performed on the corresponding feature sub-pixel in the target sub-region.

11. A display device, characterized in that, The organic light-emitting display panel includes any one of claims 1-6.

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