WO2021227672A1 - 显示基板及其制备方法和亮度补偿方法、显示装置 - Google Patents
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Definitions
- the embodiments of the present disclosure relate to, but are not limited to, the field of display technology, and in particular to a display substrate, a preparation method thereof, a brightness compensation method, and a display device.
- AMOLED Active-matrix Organic Light Emitting Diode
- the embodiment of the present disclosure provides a display substrate including a driving structure layer provided on a base, a light emitting element provided on the driving structure layer, and a light emitting element provided on the light emitting element and configured to detect the brightness of the light emitting element
- the light detection unit includes a pixel drive circuit, the light-emitting element includes a first electrode, an organic functional layer and a second electrode stacked on the drive structure layer, the first electrode and the
- the pixel driving circuit is connected;
- the light detection unit includes a third electrode, a photosensitive active layer, and a fourth electrode that are stacked.
- the embodiment of the present disclosure also provides a display device including the display substrate.
- the embodiment of the present disclosure also provides a method for preparing a display substrate, including:
- the driving structure layer including a pixel driving circuit
- a light emitting element is formed on the driving structure layer, the light emitting element includes a first electrode, an organic functional layer, and a second electrode stacked on the driving structure layer, and the first electrode is connected to the pixel driving circuit ;
- a light detection unit is formed on the light-emitting element, the light detection unit is configured to detect the brightness of the light-emitting element, and the light detection unit includes a third electrode, a photosensitive active layer, and a fourth electrode that are stacked.
- the embodiments of the present disclosure provide a method for compensating the brightness of a display substrate, the display substrate including a plurality of display regions, and the method includes:
- the brightness information of multiple display areas is compared, and the brightness of the corresponding display area is compensated according to the comparison result.
- FIG. 1 is a schematic diagram of a planar structure of a display substrate in some exemplary embodiments
- FIG. 2 is a schematic diagram of the A-A cross-sectional structure of the display substrate of FIG. 1 in some exemplary embodiments;
- FIG. 3 is a schematic diagram of a structure after forming a driving structure layer in some exemplary embodiments
- FIG. 4 is a schematic diagram of the structure after forming the first electrode in some exemplary embodiments.
- FIG. 5 is a schematic diagram of a structure after forming a pixel defining layer in some exemplary embodiments
- FIG. 6 is a schematic diagram of the structure after forming the second electrode in some exemplary embodiments.
- FIG. 7 is a schematic diagram of a structure after forming a photosensitive active layer in some exemplary embodiments.
- FIG. 8 is a schematic diagram of a structure after forming a fourth electrode in some exemplary embodiments.
- FIG. 9 is a schematic diagram of the A-A cross-sectional structure of the display substrate of FIG. 1 in some exemplary embodiments;
- FIG. 10 is a schematic diagram of a structure after forming a cover layer on the second electrode in some exemplary embodiments.
- FIG. 11 is a schematic diagram of a structure after forming a third electrode on the cover layer in some exemplary embodiments.
- FIG. 12 is a schematic diagram of the structure after forming a photosensitive active layer in some exemplary embodiments.
- FIG. 13 is a schematic diagram of a structure after forming a fourth electrode in some exemplary embodiments.
- FIG. 14 is a schematic diagram of a planar structure of a display substrate in some exemplary embodiments.
- FIG. 15 is a schematic diagram of a B-B cross-sectional structure of the display substrate of FIG. 14 in some exemplary embodiments;
- 16 is a schematic diagram of the structure after forming a photosensitive active layer on the second electrode in some exemplary embodiments
- FIG. 17 is a schematic diagram of a structure after forming a fourth electrode in some exemplary embodiments.
- FIG. 18 is a schematic diagram of a B-B cross-sectional structure of the display substrate of FIG. 14 in some exemplary embodiments;
- 19 is a schematic diagram of the structure after forming a photosensitive active layer in some exemplary embodiments.
- 20 is a schematic diagram of a structure after forming a fourth electrode in some exemplary embodiments.
- FIG. 21 is a schematic diagram of a film structure of a display substrate in some exemplary embodiments.
- FIG. 22 is a schematic diagram of a film structure of a display substrate in some exemplary embodiments.
- FIG. 23 is a diagram showing the relationship between the current and the applied bias voltage of the light detection unit of the display substrate of some exemplary embodiments when there is no light and when there is light;
- FIG. 24 is an absorption spectrum diagram and a photoelectric conversion efficiency diagram of a response wavelength band of a light detection unit of a display substrate according to some exemplary embodiments.
- the embodiment of the present disclosure provides a display substrate including a driving structure layer provided on a base, a light emitting element provided on the driving structure layer, and a light emitting element provided on the light emitting element and configured to detect the brightness of the light emitting element
- the light detection unit includes a pixel drive circuit, the light-emitting element includes a first electrode, an organic functional layer and a second electrode stacked on the drive structure layer, the first electrode and the
- the pixel driving circuit is connected;
- the light detection unit includes a third electrode, a photosensitive active layer, and a fourth electrode that are stacked.
- the third electrode is connected to the second electrode.
- the second electrode and the third electrode are an integral structure.
- the display substrate further includes a cover layer disposed between the second electrode and the third electrode, and the third electrode is disposed on the cover layer;
- the electrode is connected to the second electrode through a via hole opened in the cover layer, or the third electrode is connected to a low voltage line in the peripheral area of the display substrate.
- FIG. 1 shows a plan view of a foldable display substrate, including a first display area 101, a second display area 102, and a first display area 101 and a second display area.
- the first display area 101 may be the main screen area (in use when the foldable display product is expanded and folded), and the second display area 102 may be the secondary display area (only in the use state when the foldable display product is expanded).
- the first display area 101, the second display area 102, and the bending area 103 may be an integrated structure, and are an integrated display area in the expanded screen state.
- the display substrate includes a plurality of pixel units P arranged in an array arrangement, and the pixel units P are also called pixels for displaying images.
- Each pixel unit P may include a plurality of sub-pixels, and the light emitted by the plurality of sub-pixels can be mixed with each other to obtain different colors, so that each pixel unit P can display a variety of colors (for example, white).
- each pixel unit P may include four sub-pixels, namely a first sub-pixel P1 that emits red light, a second sub-pixel P2 and a third sub-pixel P3 that emit green light, and a fourth sub-pixel that emits blue light. Sub-pixel P4.
- the pixel unit P may include three sub-pixels, and the three sub-pixels emit red light, green light, and blue light, respectively, or the pixel unit P may include four sub-pixels, and the four sub-pixels emit red light and green light, respectively. , Blue light and white light.
- the number, type and arrangement of the sub-pixels of the pixel unit P are not limited.
- the sub-pixels that emit light of the same color in the display substrate are referred to as sub-pixels of the same color.
- the light detection unit 6 is provided in the area where part of the pixel units P in the first display area 101 and the second display area 102 are located. In some examples, according to the size of the display area, 3 to 12 of the light detection units 6 may be arranged in each display area. For example, in FIG. 1, 9 light detection units 6 are shown in the first display area 101, and 6 light detection units 6 are shown in the second display area 102. Each light detection unit 6 is arranged in an area where a pixel unit P is located, and can detect the light-emitting brightness of a corresponding pixel unit P.
- FIG. 2 shows an A-A cross-sectional view of the display substrate shown in FIG. 1.
- the display substrate includes a driving structure layer 2 provided on the base 1, a light emitting element 3 provided on the driving structure layer 2, and a light detecting unit 6 provided on the light emitting element 3 and configured to detect the brightness of the light emitting element 3.
- the driving structure layer 2 includes a pixel driving circuit, and the pixel driving circuit of each sub-pixel may include a plurality of transistors and storage capacitors.
- FIG. 2 takes one driving transistor and one storage capacitor as an example for illustration.
- the driving structure layer 2 includes: a first insulating layer disposed on the flexible substrate 1, an active layer disposed on the first insulating layer, a second insulating layer covering the active layer, and a first insulating layer disposed on the second insulating layer.
- the source/drain metal layer is a flat layer covering the source/drain metal layer.
- the first gate metal layer includes at least a gate electrode and a first capacitor electrode
- the second gate metal layer includes at least a second capacitor electrode
- the source-drain metal layer includes at least a source electrode and a drain electrode
- the pole constitutes a driving transistor
- the first capacitor electrode and the second capacitor electrode constitute a storage capacitor.
- the light-emitting element 3 may be disposed on the flat layer of the driving structure layer 2.
- the light-emitting element 3 includes a first electrode 31, an organic light-emitting layer 23, and a second electrode 33 that are stacked, and the first electrode 31 passes The first via hole opened on the flat layer is connected to the drain electrode of the driving transistor.
- the display substrate further includes a pixel defining layer 4, and a plurality of pixel openings are provided on the pixel defining layer 4, and each pixel opening is used to define a light emitting element 3.
- the light detecting unit 6 is provided on the second electrode 33 of the light emitting element 3.
- the third electrode 62 of the light detection unit 6 and the second electrode 33 of the light-emitting element 3 are integrated, the photosensitive active layer 61 of the light detection unit 6 is directly disposed on the second electrode 33, and the fourth electrode 63 is disposed.
- the orthographic projections of the photosensitive active layer 61 and the fourth electrode 63 on the substrate 1 both include the orthographic projections of the effective light-emitting areas of all sub-pixels in the pixel unit P on the substrate 1.
- the area where the pixel unit P is located The photosensitive active layer 61 is an integral structure.
- the fourth electrodes 63 in the regions where different pixel units P are located are separated from each other.
- the material of the photosensitive active layer 61 can absorb the light emitted by all the sub-pixels in the pixel unit P and generate carriers.
- the light detecting unit 6 can detect the brightness of each sub-pixel in the pixel unit P.
- the display substrate is a top-emitting OLED display substrate
- the first electrode 31 is a highly reflective anode
- the second electrode 33 is a transparent or semi-transparent cathode
- the fourth electrode 63 is a transparent or semi-transparent anode.
- the display substrate further includes an encapsulation structure layer 7, and the encapsulation structure layer 7 is disposed on the light detection unit 6.
- the encapsulation structure layer 7 may be a thin film encapsulation layer, which may include a layer stacked on the fourth electrode 63. The first inorganic encapsulation layer, the organic encapsulation layer, and the second inorganic encapsulation layer.
- the display substrate can be folded and unfolded, and can be applied to a foldable display product, such as a foldable mobile phone or a foldable notebook computer.
- the first display area 101 may be the main screen area (in use when the foldable display product is expanded and folded), and the second display area 102 may be the secondary display area (only in the use state when the foldable display product is expanded).
- the brightness of different positions in the first display area 101 can be detected by the 9 light detection units 6 provided in the first display area 101, and the second display area 102 can be detected by the 6 light detection units 6 provided in the second display area 102.
- the brightness of different positions in the display area 102 can be further compensated for the brightness of the first display area 101 or/and the second display area 102 according to the brightness difference between the first display area 101 and the second display area 102 to improve the display substrate Uniformity of brightness in unfolded state.
- multiple light detection units 6 can directly detect the brightness of different positions of the display substrate in real time, thereby realizing a real-time detection-compensation process, and achieving a display effect with uniform brightness in different display areas.
- the structure and manufacturing process of the display substrate will be further described below in conjunction with the manufacturing method of the display substrate shown in FIG. 2.
- the "patterning process” referred to in this article includes processes such as depositing a film, coating photoresist, mask exposure, developing, etching, and stripping photoresist.
- the deposition can be sputtering, vapor deposition, chemical vapor deposition and other processes, which are not limited here.
- thin film refers to a layer of film made by depositing a certain material on the substrate 1 or by other processes.
- the orthographic projection of A includes the orthographic projection of B means that the orthographic projection of B falls within the orthographic projection of A, or the orthographic projection of A covers the orthographic projection of B.
- the driving structure layer 2 is formed.
- the preparation process of the driving structure layer 2 may include:
- a first insulating film and an active layer film are sequentially deposited on the flexible substrate 1, and the active layer film is patterned through a patterning process to form a first insulating layer 21 covering the entire flexible substrate 1, and set on the first insulating layer 21
- the active layer pattern includes at least the active layer 201 of each sub-pixel.
- a second insulating film and a first metal film are sequentially deposited, and the first metal film is patterned through a patterning process to form a second insulating layer 22 covering the active layer pattern, and a first insulating layer 22 disposed on the second insulating layer 22.
- the gate metal layer pattern, the first gate metal layer pattern includes at least the gate electrode 202 and the first capacitor electrode 2001 of each sub-pixel.
- a third insulating film and a second metal film are sequentially deposited, and the second metal film is patterned through a patterning process to form a third insulating layer 23 covering the first gate metal layer, and a second insulating layer disposed on the third insulating layer 23
- the second gate metal layer pattern includes at least the second capacitor electrode 2002 of each sub-pixel, and the position of the second capacitor electrode 2002 corresponds to the position of the first capacitor electrode 2001.
- a fourth insulating film is deposited, and the fourth insulating film is patterned through a patterning process to form a pattern of the fourth insulating layer 24 covering the second gate metal layer.
- At least two insulating layers 24 are provided on the fourth insulating layer 24 of each sub-pixel. Holes, the fourth insulating layer 24, the third insulating layer 23, and the second insulating layer 22 in the two vias are etched away, exposing the surface of the active layer 201.
- the source-drain metal layer includes at least the source electrode 203 and the drain electrode 204 of each sub-pixel.
- the source electrode 203 and the drain electrode 204 are connected to the active layer 201 through two via holes passing through the fourth insulating layer 24, the third insulating layer 23, and the second insulating layer 22, respectively.
- a flat film of organic material is coated on the flexible substrate 1 forming the aforementioned pattern, and a first via 251 is formed on the flat film of each sub-pixel through a mask, exposure, and development process.
- the flat film is developed to expose the surface of the drain electrode 204 of the transistor, thereby forming a flat layer (PLN) 25 covering the entire flexible substrate 1.
- the pattern of the driving structure layer 2 is prepared on the flexible substrate 1, as shown in FIG. 3.
- the active layer 201, the gate electrode 202, the source electrode 203 and the drain electrode 204 constitute a driving transistor
- the first capacitor electrode 2001 and the second capacitor electrode 2002 constitute a storage capacitor.
- the first insulating layer, the second insulating layer, the third insulating layer, and the fourth insulating layer may be in silicon oxide (SiOx), silicon nitride (SiNx), and silicon oxynitride (SiON). Any one or more of can be single-layer, multi-layer or composite layer.
- the first insulating layer is called a buffer layer, which is used to improve the water and oxygen resistance of the substrate 1, the second insulating layer and the third insulating layer are called gate insulating (GI) layers, and the fourth insulating layer is called a layer. Inter-insulation (ILD) layer.
- the first metal film, the second metal film and the third metal film can be made of metal materials, such as any one of silver (Ag), copper (Cu), aluminum (Al), titanium (Ti), and molybdenum (Mo) or Multiple, or alloy materials of the above metals, such as aluminum neodymium alloy (AlNd) or molybdenum niobium alloy (MoNb), may have a single-layer structure or a multilayer composite structure, such as Ti/Al/Ti.
- metal materials such as any one of silver (Ag), copper (Cu), aluminum (Al), titanium (Ti), and molybdenum (Mo) or Multiple, or alloy materials of the above metals, such as aluminum neodymium alloy (AlNd) or molybdenum niobium alloy (MoNb)
- AlNd aluminum neodymium alloy
- MoNb molybdenum niobium alloy
- the active layer film can use amorphous indium gallium zinc oxide (a-IGZO), zinc oxynitride (ZnON), indium zinc tin oxide (IZTO), amorphous silicon (a-Si), polysilicon (p-Si) , Hexathiophene, or polythiophene and other materials, that is, the present disclosure is applicable to transistors manufactured based on oxide technology, silicon technology, and organic technology.
- a-IGZO amorphous indium gallium zinc oxide
- ZnON zinc oxynitride
- IZTO indium zinc tin oxide
- a-Si amorphous silicon
- p-Si polysilicon
- Hexathiophene Hexathiophene
- polythiophene and other materials
- a transparent conductive film is deposited on the flexible substrate 1 forming the aforementioned pattern, and the transparent conductive film is patterned through a patterning process to form a pattern of the first electrode 31 of the light-emitting element 3.
- An electrode 31 is formed on the flat layer 25 and is connected to the drain electrode 204 of the driving transistor through the first via 251 on the flat layer 25.
- the material of the first electrode 31 may be a highly reflective material.
- a pixel defining film is coated on the substrate 1 forming the aforementioned pattern, and a pixel defining layer (PDL) 4 is formed through masking, exposing, and developing processes. A plurality of pixel openings are opened on the upper side, and the pixel defining layer 4 in the pixel openings is developed away, exposing the surface of the first electrode 31.
- the material of the pixel definition layer can be polyimide, acrylic or polyethylene terephthalate.
- An organic functional layer 32 and a second electrode 33 are sequentially formed on the flexible substrate 1 formed with the aforementioned pattern.
- the organic functional layer 32 is formed in the pixel opening of the pixel defining layer 4, so that the organic functional layer 32 is connected to the first electrode 31, and the second electrode 33 is formed on the pixel defining layer. 4, and connected with the organic functional layer 32.
- the effective light-emitting area of each sub-pixel is the area of the pixel defining layer 4 that defines the pixel opening of the sub-pixel in a direction parallel to the substrate 1.
- the second electrodes 33 of the plurality of sub-pixels have an integral structure connected to each other.
- the organic functional layer 32 may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer that are stacked.
- the material of the second electrode 33 can be any one or more of magnesium (Mg), silver (Ag), aluminum (Al), copper (Cu) and lithium (Li), or any one or more of the above metals can be used. A variety of alloys made.
- the second electrode 33 may be a transparent or semi-transparent electrode layer.
- the second electrode 33 of the light-emitting element 3 and the third electrode 62 of the light detection unit 6 may have a common structure, and the second electrode 33 of the light-emitting element 3 and the third electrode 62 of the light detection unit 6 may be All are cathodes.
- a photosensitive active layer 61 is formed on the flexible substrate 1 formed with the aforementioned pattern.
- an evaporation process may be used to form a photosensitive active layer 61 on the second electrode 33.
- the photosensitive active layer 61 covers the effective light-emitting area of all sub-pixels of a pixel unit P, namely
- the orthographic projection of the photosensitive active layer 61 on the substrate 1 includes the orthographic projection of the effective light-emitting areas of all sub-pixels of one pixel unit P on the substrate 1.
- the orthographic projection of the photosensitive active layer 61 on the substrate 1 and the orthographic projection of the effective light-emitting regions of the sub-pixels of other pixel units P on the substrate 1 do not overlap.
- the orthographic projection range of the photosensitive active layer 61 on the substrate 1 may be set according to the number of pixel units P detected.
- the material of the photosensitive active layer 61 can absorb the light emitted by all the sub-pixels in the pixel unit P and generate carriers, and the light detection unit 6 can detect the brightness of the four sub-pixels of the pixel unit P.
- the material of the photosensitive active layer 61 may have a strong light absorption intensity in the entire visible light band from 380 to 780 nm.
- the material of the photosensitive active layer 61 may be a mixed material system of a red light absorbing material, a green light absorbing material and a blue light absorbing material, or It is a single material system with strong light absorption in the entire visible light band from 380 to 780nm.
- the fourth electrode 63 of the light detection unit 6 is formed on the flexible substrate 1 formed with the aforementioned pattern.
- a fourth electrode 63 is formed on the photosensitive active layer 61.
- the fourth electrodes 63 of the four sub-pixels may be an integral structure, or each sub-pixel may be separately provided with a fourth electrode 63.
- the material of the fourth electrode (anode) 63 may include any one or more of silver (Ag), aluminum (Al), and gold (Au).
- the fourth electrode 63 may be a transparent or semi-transparent electrode layer.
- the light detection unit 6 may detect the light emission brightness of all sub-pixels in one pixel unit P. For example, when the picture displayed on the display substrate is set as a monochrome picture (that is, a picture in which only red sub-pixels, green sub-pixels, or blue sub-pixels emit light), the light detection unit 6 detects the light-emitting brightness of the sub-pixels of the same color; When the picture displayed by the display substrate is set as a mixed-color picture (that is, the picture displayed by the sub-pixels of different colors emitting light), the light detection unit 6 detects the light-emitting brightness of the sub-pixels of different colors.
- a monochrome picture that is, a picture in which only red sub-pixels, green sub-pixels, or blue sub-pixels emit light
- the light detection unit 6 detects the light-emitting brightness of the sub-pixels of the same color
- the picture displayed by the display substrate is set as a mixed-color picture (that is, the picture displayed by the sub-pixel
- An encapsulation structure layer 7 is formed on the flexible substrate 1 formed with the aforementioned pattern.
- the encapsulation structure layer 7 covers the light detection unit 6 and the second electrode 33.
- the second electrode 33 of the light-emitting element 3 and the third electrode 62 of the light detecting unit 6 are not shared, and a covering layer 5 is provided between the two, and the third electrode 62 passes The via hole opened on the cover layer 5 is connected to the second electrode 33.
- the orthographic projections of the photosensitive active layer 61, the third electrode 62 and the fourth electrode 63 on the substrate 1 all include the orthographic projections of the effective light-emitting areas of all the sub-pixels in the pixel unit P on the substrate 1.
- the photosensitive active layer 61 in the area where the pixel unit P is located may be an integral structure.
- any one of the third electrode 62 and the fourth electrode 63 on the display substrate can be an integrated structure, and the other can be separated from each other in the area where the different pixel units P are located.
- the third electrode 62 can be an integrated structure.
- the orthographic projection of the third electrode 62 on the substrate 1 may include the orthographic projection of the cover layer 5 on the substrate 1.
- the fourth electrodes 63 in the regions where the different pixel units P are located are separated from each other, and the third electrode may not be provided on the cover layer 5 62 is a via hole connected to the second electrode 33, and the third electrode 62 is connected to a low-voltage line (the low-voltage line is connected to the second electrode of the light-emitting element) in the peripheral area of the display substrate.
- the display substrate may be a top-emission OLED display substrate, the material of the first electrode 31 may be a highly reflective material, and the material of the second electrode 33, the third electrode 62 and the fourth electrode 63 may all be transparent or semi-transparent materials.
- a cover layer film is coated on the second electrode 33, and a mask, Exposure and development processes form a capping layer (Capping Layer)5.
- the covering layer 5 is provided with a plurality of second via holes 51, and the covering layer 5 in the second via holes 51 is developed away, exposing the surface of the second electrode 33.
- the cover layer 5 may be a light extraction layer.
- a third electrode film is deposited on the cover layer 5, and the third electrode film is connected to the second electrode 33 through the second via 51 on the cover layer 5.
- the material of the third electrode (cathode) 62 may be magnesium silver alloy (Mg:Ag).
- a photosensitive active layer 61 is formed on the third electrode 62, and the formation process of the photosensitive active layer 61 may be the same as the preparation process of the photosensitive active layer 61 in FIG. 7 above.
- a fourth electrode 63 is formed on the photosensitive active layer 61, and the formation process of the fourth electrode 63 may be the same as the preparation process of the fourth electrode 63 in FIG. 8 above.
- the light detecting unit 6 is disposed in the area where one pixel unit P is located, and the photosensitive active layer 61 of the light detecting unit 6 is on the substrate.
- the orthographic projection on 1 includes the orthographic projection of the effective light-emitting areas of all sub-pixels of one pixel unit P on the substrate 1 and does not overlap with the orthographic projections of the effective light-emitting areas of the sub-pixels of other pixel units P on the substrate 1.
- the orthographic projection of the photosensitive active layer 61 of the light detecting unit 6 on the substrate 1 may also overlap with the orthographic projection of the effective light-emitting areas of the sub-pixels of other pixel units P on the substrate 1.
- the display substrate includes a plurality of light detection units 6, and all the sub-pixels in which the orthographic projection of the effective light-emitting area on the substrate 1 and the orthographic projection of the photosensitive active layer 61 of the corresponding light detection unit 6 on the substrate 1 overlap are called
- one light detection unit 6 corresponds to a group of sub-pixels, and the types and numbers of sub-pixels included in any two groups of sub-pixels are the same.
- a group of sub-pixels corresponding to each light detection unit 6 includes all sub-pixels of a corresponding pixel unit P, and may also include sub-pixels of other pixel units P (such as a red sub-pixel of other pixel units P). ).
- a light detection unit is provided in the area where each sub-pixel in some pixel units is located, and the photosensitive active layers in the area where the sub-pixels of different colors in the pixel unit are located are separated from each other and have different materials.
- FIG. 14 shows a plan view of a display substrate of a structure.
- a plurality of light detection units 6 are arranged in both the first display area 101 and the second display area 102, and each light detection unit 6 is arranged in the area where the sub-pixels of the same color in the pixel unit P are located.
- the orthographic projection of the photosensitive active layer, the third electrode and the fourth electrode of the detection unit 6 on the substrate 1 all include the orthographic projection of the effective light-emitting area of the corresponding sub-pixel on the substrate 1.
- Each light detection unit 6 is configured to detect the brightness of the sub-pixels of the same color in a pixel unit P, and the material of the photosensitive active layer 61 can absorb the light emitted by the sub-pixels of the corresponding color and generate carriers.
- each pixel unit P may include four sub-pixels, namely a first sub-pixel P1 that emits red light, a second sub-pixel P2 and a third sub-pixel P3 that emit green light, and a fourth sub-pixel that emits blue light. Sub-pixel P4.
- Three light detection units can be arranged in the area where a pixel unit P is located, including: a first light detection unit 601 arranged in the area where the first sub-pixel P1 is located and detecting the luminous brightness of the first sub-pixel P1; P2 and the third sub-pixel P3 are located in the area and detect the second sub-pixel P2 and the third sub-pixel P3 light-emitting brightness of the second light detection unit 602, arranged in the area where the fourth sub-pixel P4 is located and detect the fourth sub-pixel P4
- the photosensitive active layers of the first light detection unit 601, the second light detection unit 602, and the third light detection unit 603 are separated from each other and have different materials.
- the plurality of light detection units arranged in the area where one pixel unit P is located is referred to as a group of light detection units (for example, the first light detection unit 601, the second light detection unit 602, and the third light detection unit 601).
- the detection unit 603 is referred to as a group of light detection units), and a group of light detection units may be provided at multiple positions on the display substrate.
- 9 groups of light detection units are provided in the first display area 101, including 9 first light detection units 601 for detecting the luminescence brightness of the green sub-pixels, and 9 second light detection units 601 for detecting the luminescence brightness of the blue sub-pixels.
- Unit 602 9 third light detection units 603 for detecting the luminous brightness of the red sub-pixels.
- 6 groups of light detection units are provided in the second display area 102, including 6 first light detection units 601 for detecting the luminous brightness of the green sub-pixels, 6 second light detection units 602 for detecting the luminous brightness of the blue sub-pixels, and 6
- the third light detection unit 603 detects the light emission brightness of the red sub-pixel.
- the number of groups of light detection units in the first display area 101 and the second display area 102 can be set according to the size of the corresponding display area, for example, 9 to 12 groups of light detection units can be set in the first display area 101 , 3 to 6 groups of light detection units can be arranged in the first display area 102.
- FIG. 15 shows a B-B cross-sectional view of the display substrate shown in FIG. 14.
- the display substrate includes a drive structure layer 2, a light emitting element 3 provided on the drive structure layer 2, a light detection unit 6 provided on the light emitting element 3, and an encapsulation structure layer 7 provided on the light detection unit 6 .
- the third electrode 62 of each light detection unit 6 and the second electrode 33 of the light-emitting element 3 may be an integral structure, and the photosensitive active layer 61 of each light detection unit 6 is directly disposed on the second electrode 33,
- the fourth electrode 63 is provided on the photosensitive active layer 61.
- the photosensitive active layers 61 in the regions where the sub-pixels of different colors are located are separated from each other, and the fourth electrode 63 is separated from each other.
- each photosensitive active layer 61 is formed on the second electrode 33 in the area where the second sub-pixel P2 and the third sub-pixel P3 and the fourth sub-pixel P4 are located.
- the orthographic projection of each photosensitive active layer 61 on the substrate 1 includes the orthographic projection of the effective light-emitting area of its sub-pixel on the substrate 1, and the three photosensitive active layers 61 are not overlapped and separated from each other.
- the three photosensitive active layers 61 have different materials and can be formed by three evaporation processes.
- the materials of the three photosensitive active layers 61 can absorb the light emitted by the corresponding color sub-pixels and generate carriers.
- the first light detection unit 601 detects the red sub-pixels, and the material of the photosensitive active layer 61 of the first light detection unit 601 can have a strong absorption at the red wavelength band of 630 nm, for example, it can be a copper phthalocyanine derivative material.
- the second light detection unit 602 detects the green sub-pixels, and the material of the photosensitive active layer 61 of the second light detection unit 602 can have a strong absorption in the green wavelength band of 530 nm, for example, it can be a perylene diylidene derivative material.
- the third light detection unit 603 detects the blue sub-pixels, and the material of the photosensitive active layer 61 of the third light detection unit 603 can have a strong absorption of the blue wavelength band 460nm, for example, it can be a derivative based on the fluoroboron dipyrrole (Bodipy) structure Material.
- Bodipy fluoroboron dipyrrole
- the molecular structural formulas of Bodipy derivative materials, copper phthalocyanine derivative materials, and perylene diimidyl derivative materials can be:
- one pixel unit P may include four sub-pixels that emit red light, green light, blue light, and white light, respectively.
- the display substrate may include sub-pixels configured to detect white light (organic function of the white light sub-pixels).
- the layer 32 may include a red light emitting layer, a green light emitting layer, and a blue light emitting layer that are stacked and arranged to detect light emitting brightness.
- the material of the photosensitive active layer of the light detection unit for detecting the luminous brightness of the white light sub-pixels can be a mixed material system of red light absorbing material, green light absorbing material and blue light absorbing material, or a strong light absorption intensity in the entire visible light band from 380 to 780 nm Single material system.
- three fourth electrodes 63 may be respectively formed on the three photosensitive active layers 61 through an evaporation process, that is, one fourth electrode is formed on each photosensitive active layer 61. 63. Using the size of the opening area of the mask used in the evaporation process, three fourth electrodes 63 are formed on the three photosensitive active layers 61. The three fourth electrodes 63 are independent electrodes and are separated from each other. In an example, as shown in FIG. 15, an encapsulation structure layer 7 is formed, and the encapsulation structure layer 7 covers the aforementioned structure.
- FIG. 18 shows a B-B cross-sectional view of the display substrate shown in FIG. 14.
- the second electrode 33 of the light-emitting element 3 and the third electrode 62 of the light detection unit 6 are not shared, and a covering layer 5 is provided between the two, and the third electrode 62 passes through the via hole opened on the covering layer 5.
- the second electrode 33 is connected.
- Any one of the third electrode 62 and the fourth electrode 63 on the display substrate may be an integrated structure, and the other may be separated from each other in the area where the sub-pixels of different colors are located.
- the third electrode 62 may be an integrated structure.
- the orthographic projection of the third electrode 62 on the substrate 1 may include the orthographic projection of the cover layer 5 on the substrate 1.
- the fourth electrodes 63 in the regions where the sub-pixels of different colors in the pixel unit P are located are separated from each other, and the cover layer 5 may not be A via hole connecting the third electrode 62 and the second electrode 33 is opened, and the third electrode 62 is connected to the low-voltage line (the low-voltage line is connected to the second electrode of the light-emitting element) in the peripheral area of the display substrate.
- the method of forming the cover layer 5 on the second electrode 33 of the light-emitting element 3 may be the same as that shown in FIG.
- the method of forming the third electrode 62 on the cover layer 5 may be the same as that in the previous figure 11 is the same.
- the first sub-pixel P1 is located, the second sub-pixel P2 and the third sub-pixel P3 are located, and the fourth sub-pixel P4 is located.
- Three photosensitive active layers 61 are formed on the three electrodes 62.
- the method of forming the three photosensitive active layers 61 may be the same as that of FIG. 16 above.
- three fourth electrodes 63 are respectively formed on the three photosensitive active layers 61, and the method of forming the three fourth electrodes 63 can be the same as that of FIG. 17 above.
- FIG. 21 shows a schematic diagram of the film structure of the display substrate when the second electrode 33 of the light-emitting element 3 and the third electrode 62 of the light detection unit 6 are integrated and shared.
- the photosensitive active layer 61 of the light detection unit 6 is directly disposed on the second electrode 33 of the light-emitting element 3.
- FIG. 22 shows the film of the display substrate when the cover layer 5 is provided between the second electrode 33 of the light-emitting element 3 and the third electrode 62 of the light detecting unit 6 Schematic diagram of layer structure.
- the cover layer 5 is provided on the second electrode 33 of the light-emitting element 3
- the third electrode 62 of the light detecting unit 6 is provided on the cover layer 5 and passes through the second via 51 opened on the cover layer 5 and the light emitting The second electrode 33 of the element 3 is connected.
- FIG. 23 shows the relationship between the current and the applied bias voltage of the light detection unit 6 of the display substrate of some exemplary embodiments when there is no light and when there is light.
- the working principle of the light detection unit 6 detecting the light-emitting brightness of the light-emitting element 3 can be as follows: in the reverse bias positive voltage interval of the light detection unit 6 (which can be in the third electrode 62 and the fourth electrode of the light detection unit 6). A positive bias or a negative bias is applied between 63, and in one example, the light detection unit 6 can always work in the reverse bias positive voltage interval shown in FIG. 23), as shown by curve b in FIG.
- the light-detecting unit 6 when When the light-emitting element 3 is not lit, the light-detecting unit 6 is not illuminated, and the current density of the light-detecting unit 6 is very small (the current at this time is a dark current); as shown by the a curve, when the light-emitting element 3 is turned on, The photosensitive active layer 61 of the light detecting unit 6 is excited by the light emitted by the light emitting element 3, and photo-generated carriers are formed in the photosensitive active layer 61, thereby forming a photocurrent that is many times higher than the dark current in the light detecting unit 6. Thus, the light-emitting brightness of the light-emitting element 3 can be sensed and detected.
- the brightness of the light-emitting element 3 directly affects the magnitude of the photocurrent of the light detection unit 6. Therefore, the light detection unit 6 can directly detect the light-emitting brightness of the light-emitting element 3. Through the change trend of the photocurrent of the light detection unit 6, the change trend of the brightness of the light-emitting element 3 can be monitored.
- the working principle of the light detection unit 6 is similar to that of a photodiode.
- FIG. 24 shows an absorption spectrum diagram and a photoelectric conversion efficiency diagram of the response wavelength band of the light detection unit 6 of the display substrate of some exemplary embodiments.
- the d curve represents the absorption spectrum of the photosensitive active layer 61 in the visible light range from 380 to 780 nm. For example, it has strong absorption in the entire visible light range, or in the red, green or blue wavelength range. It has stronger absorption alone; the c curve represents the efficiency level of the light detection unit 6 in converting the light of the light-emitting element 3 into photocurrent. The larger the external quantum efficiency value, the higher the photoelectric conversion efficiency.
- the wavelength response curve of the photoelectric conversion efficiency is related to the absorption spectrum range of the photosensitive active layer 61.
- the display substrate may be a white light organic electroluminescent diode (WOLED) display substrate, each light-emitting element in the display substrate emits white light, the organic functional layer of all the light-emitting elements is a common layer, and the organic functional layer may It includes a red light emitting layer, a green light emitting layer and a blue light emitting layer that are stacked.
- the light detection unit is arranged on the light-emitting element, and the display substrate may further include a color filter layer arranged on the side of the light detection unit away from the substrate.
- the material of the photosensitive active layer of the light detection unit can be a mixed material system of red light absorbing material, green light absorbing material and blue light absorbing material, or a single material system with strong light absorption intensity in the entire visible light band from 380 to 780 nm.
- the embodiment of the present disclosure provides a method for preparing a display substrate, including:
- the driving structure layer including a pixel driving circuit
- a light emitting element is formed on the driving structure layer, the light emitting element includes a first electrode, an organic functional layer, and a second electrode stacked on the driving structure layer, and the first electrode is connected to the pixel driving circuit ;
- a light detection unit is formed on the light-emitting element, the light detection unit is configured to detect the brightness of the light-emitting element, and the light detection unit includes a third electrode, a photosensitive active layer, and a fourth electrode that are stacked.
- the third electrode is connected to the second electrode.
- the second electrode and the third electrode are an integral structure
- the forming a photodetection unit on the light-emitting element includes: forming the photosensitive activity on the second electrode Layer, forming the fourth electrode on the photosensitive active layer.
- the display substrate further includes a cover layer, and forming a light detection unit on the light-emitting element includes:
- the fourth electrode is formed on the photosensitive active layer.
- the display substrate further includes a cover layer, and forming a light detection unit on the light-emitting element includes:
- the fourth electrode is formed on the photosensitive active layer.
- the embodiments of the present disclosure provide a method for compensating the brightness of a display substrate, the display substrate including a plurality of display regions, and the method includes:
- the brightness information of multiple display areas is compared, and the brightness of the corresponding display area is compensated according to the comparison result.
- the collecting brightness information of each display area includes: according to a set interval of two brightness compensations (such as one day, two days, or one week, etc.) or according to instructions, starting to collect each The brightness information of the display area.
- the collecting brightness information of each display area includes: setting the screen displayed on the display substrate as a monochrome screen (that is, only red sub-pixels, green sub-pixels or blue sub-pixels emit light. ⁇ picture), and then collect the brightness information of multiple pixel units in each display area.
- the pixel unit includes three sub-pixels that emit red light, green light, and blue light, for example, when the picture displayed by the display substrate is set to a monochrome picture displayed by red sub-pixels. On the display substrate, only the red sub-pixel emits light, and neither the green sub-pixel nor the blue sub-pixel emits light.
- the brightness information of a certain pixel unit collected at this time is also the brightness information of the red sub-pixel of the pixel unit.
- the number of pixel units collected by each collection location in each display area may be the same.
- each collection location in each display area collects the luminous brightness of a corresponding pixel unit.
- the comparing the brightness information of multiple display areas, and compensating the brightness of the corresponding display area according to the comparison result includes:
- the average brightness of the pixel units of the multiple display areas is compared, and the brightness of the corresponding display area under the monochrome screen is compensated according to the comparison result. For example, when the picture displayed by the display substrate is set as a monochrome picture displayed by red sub-pixels emitting light, the brightness of the red sub-pixels in the corresponding display area is compensated.
- the display substrate is a foldable display substrate, and includes a first display area 101, a second display area 102, and a bending area 103 located between the first display area 101 and the second display area 102.
- the first display area 101 may be the main screen area (in use when the foldable display product is expanded and folded), and the second display area 102 may be the secondary display area (only in the use state when the foldable display product is expanded). Since different consumers use different frequencies for the main screen (first display area 101) and the secondary screen (second display area 102), this will cause differences in the brightness attenuation of the main screen and the secondary screen.
- the main screen and the secondary screen are in the extended screen state. There will be a relatively obvious difference in brightness of, which will seriously affect the display effect in the expanded screen state. Therefore, it is necessary to compensate for the brightness difference between the first display area 101 and the second display area 102.
- nine light detecting units 6 are provided in the first display area 101, which are set to detect the brightness of the pixel units P at the corresponding 9 positions, that is, one light detecting unit 6 detects the pixel units at a corresponding position.
- the brightness of P, six light detection units 6 are arranged in the second display area 102, and the tongue texture detects the brightness of the pixel units P at the corresponding 6 positions, that is, one light detection unit 6 detects the pixel unit at the corresponding position.
- the brightness of P is arranged in the first display area 101, which are set to detect the brightness of the pixel units P at the corresponding 9 positions, that is, one light detecting unit 6 detects the pixel units at a corresponding position.
- the brightness of P six light detection
- the pixel unit P includes four sub-pixels, which are a first sub-pixel P1 that emits red light, a second sub-pixel P2 and a third sub-pixel P3 that emit green light, and a fourth sub-pixel P4 that emits blue light.
- the brightness compensation method of the display substrate includes the following steps:
- the above S1-S2 show the method of performing brightness compensation on the red sub-pixels in the first display area 101 and the second display area 102.
- the brightness of the green sub-pixel and the blue sub-pixel in the first display area 101 and the second display area 102 are respectively compensated by the same method.
- the collecting the brightness information of each display area includes: setting the screen displayed on the display substrate as a monochrome screen, and then collecting the corresponding color sub-pixels in each of the monochrome screens. Display brightness information of multiple locations in the area. For example, if only the red sub-pixel emits light in a monochrome picture, the brightness of the red sub-pixel is collected.
- the comparing the brightness information of multiple display areas, and compensating the brightness of the corresponding display area according to the comparison result includes:
- the average brightness of the corresponding color sub-pixels of the multiple display areas is compared, and the brightness of the corresponding display area in the monochrome picture is compensated according to the comparison result.
- the brightness compensation method of the display substrate of this embodiment will be described with reference to the display substrate shown in FIG. 14.
- the display substrate is a foldable display substrate.
- 9 groups of light detection units are provided in the first display area 101, including 9 first light detection units 601, Nine second light detection units 602 for detecting the light emission brightness of the green sub-pixel, and 9 third light detection units 603 for detecting the light emission brightness of the blue sub-pixel.
- 6 groups of light detection units are set in the second display area 102, including 6 first light detection units 601 for detecting the luminous brightness of the red sub-pixels, 6 second light detection units 602 for detecting the luminous brightness of the green sub-pixels, and 6 detection units.
- the brightness compensation method of the display substrate includes the following steps:
- Luminous brightness that is, a light detection unit 601 detects the light emission brightness of the red sub-pixel at a corresponding position, and the brightness of the 9 red sub-pixels detected by the 9 first light detection units 601 is averaged to obtain the first display
- the average brightness R1 of the red sub-pixels in the area 101; in the same way, the average brightness R2 of the red sub-pixels in the second display area 102 is obtained.
- the above S1-S2 show the method of performing brightness compensation on the red sub-pixels in the first display area 101 and the second display area 102.
- the brightness of the green sub-pixel and the blue sub-pixel in the first display area 101 and the second display area 102 are respectively compensated by the same method.
- the embodiment of the present disclosure provides a display device including the display substrate described above.
- the display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a digital camera, or a navigator.
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Abstract
Description
Claims (20)
- 一种显示基板,包括设置在基底上的驱动结构层、设置在所述驱动结构层上的发光元件,以及设置在所述发光元件上并设置为检测所述发光元件亮度的光检测单元;所述驱动结构层包括像素驱动电路,所述发光元件包括叠设在所述驱动结构层上的第一电极、有机功能层和第二电极,所述第一电极与所述像素驱动电路连接;所述光检测单元包括叠设的第三电极、光敏活性层和第四电极。
- 如权利要求1所述的显示基板,其中,所述第二电极和所述第三电极为一体结构。
- 如权利要求1所述的显示基板,还包括设置在所述第二电极和所述第三电极之间的覆盖层,所述第三电极设置在所述覆盖层上;所述第三电极通过所述覆盖层上开设的过孔与所述第二电极连接,或者所述第三电极与所述显示基板的周边区域的低压线连接。
- 如权利要求1所述的显示基板,还包括阵列排布的多个像素单元,所述像素单元包括多个子像素,部分所述像素单元所在区域内设置有所述光检测单元。
- 如权利要求4所述的显示基板,其中,所述光敏活性层、所述第三电极和所述第四电极在所述基底上的正投影均包含所述像素单元中全部子像素的有效发光区域在所述基底上的正投影,所述像素单元所在区域内的所述光敏活性层为一体结构。
- 如权利要求5所述的显示基板,其中,不同像素单元的所述第三电极为一体结构,不同像素单元所在区域内的所述第四电极相互隔开。
- 如权利要求4所述的显示基板,其中,所述像素单元中每个子像素所在区域内均设置有所述光检测单元,所述像素单元中不同颜色子像素所在区域内的所述光敏活性层相互隔开且材料不同。
- 如权利要求7所述的显示基板,其中,不同颜色子像素所在区域内的 所述光敏活性层、所述第三电极和所述第四电极在所述基底上的正投影均包含相应子像素的有效发光区域在所述基底上的正投影。
- 如权利要求8所述的显示基板,其中,不同像素单元的所述第三电极为一体结构,所述像素单元中不同颜色子像素所在区域内的所述第四电极相互隔开。
- 如权利要求1至9中任一项所述的显示基板,其中,所述基底为柔性材料制成,所述基底上设置有多个显示区域和位于相邻两个显示区域之间的弯折区域,所述弯折区域设置为在所述显示基板处于折叠状态时呈弯折状,每个显示区域内设置有3至12个所述光检测单元。
- 如权利要求4所述的显示基板,其中,所述光敏活性层在基底上的正投影包含所述像素单元的全部子像素的有效发光区域在基底上的正投影,且与其它像素单元的子像素的有效发光区域在基底上的正投影不交叠或交叠。
- 如权利要求1所述的显示基板,其中,所述第一电极为透明材料,所述第二电极、所述第三电极和所述第四电极的材料为透明或半透明材料。
- 一种显示装置,包括权利要求1至12中任一项所述的显示基板。
- 一种显示基板的制备方法,包括:在基底上形成驱动结构层,所述驱动结构层包括像素驱动电路;在所述驱动结构层上形成发光元件,所述发光元件包括叠设在所述驱动结构层上的第一电极、有机功能层和第二电极,所述第一电极与所述像素驱动电路连接;在所述发光元件上形成光检测单元,所述光检测单元设置为检测所述发光元件的亮度,所述光检测单元包括叠设的第三电极、光敏活性层和第四电极。
- 如权利要求14所述的显示基板的制备方法,其中,所述第二电极和所述第三电极为一体结构,所述在所述发光元件上形成光检测单元,包括:在所述第二电极上形成所述光敏活性层,在所述光敏活性层上形成所述第四电极。
- 如权利要求14所述的显示基板的制备方法,其中,所述显示基板还 包括覆盖层,所述在所述发光元件上形成光检测单元,包括:在所述第二电极上形成覆盖层,所述覆盖层上开设有过孔;在所述覆盖层上形成所述第三电极,所述第三电极通过所述覆盖层上开设的过孔与所述第二电极连接;在所述第三电极上形成所述光敏活性层;在所述光敏活性层上形成所述第四电极。
- 如权利要求14所述的显示基板的制备方法,其中,所述显示基板还包括覆盖层,所述在所述发光元件上形成光检测单元,包括:在所述第二电极上形成覆盖层;在所述覆盖层上形成所述第三电极,所述第三电极与所述显示基板的周边区域的低压线连接;在所述第三电极上形成所述光敏活性层;在所述光敏活性层上形成所述第四电极。
- 一种显示基板的亮度补偿方法,所述显示基板包括多个显示区域,所述方法包括:采集每个显示区域的亮度信息;将多个显示区域的亮度信息进行比较,根据比较结果对相应显示区域的亮度进行补偿。
- 根据权利要求18所述的显示基板的亮度补偿方法,其中,所述采集每个显示区域的亮度信息,包括:将所述显示基板显示的画面设置为单色画面,然后采集每个显示区域内多个像素单元的亮度信息。
- 根据权利要求19所述的显示基板的亮度补偿方法,其中,所述将多个显示区域的亮度信息进行比较,根据比较结果对相应显示区域的亮度进行补偿,包括:对每个显示区域内多个像素单元的亮度取平均值,得到每个显示区域的像素单元的平均亮度;将多个显示区域的像素单元的平均亮度进行比较,根据比较结果对相应显示区域在所述单色画面下的亮度进行补偿。
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CN111540775A (zh) * | 2020-05-11 | 2020-08-14 | 京东方科技集团股份有限公司 | 显示基板及其制备方法和亮度补偿方法、显示装置 |
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