Display substrate and display panel

Abstract

The invention provides a display substrate and a display panel, belongs to the technical field of display, and can solve the problem that light interference exists during touch detection in an existing display product. The display substrate of the present disclosure includes: a light emitting device layer configured to emit a first color light; the quantum dot layer at least comprises a first quantum dot unit and a second quantum dot unit, the first quantum dot unit is configured to emit second color light under excitation of the first color light, and the second quantum dot unit is configured to emit third color light under excitation of the first color light; the touch detection layer is configured to determine touch information according to the received optical signal; the auxiliary function layer is arranged between the quantum dot layer and the light-emitting device layer; wherein the auxiliary function layer is configured to transmit the first color light and reflect the second color light and the third color light, so that the interference of the auxiliary function layer on the touch detection layer is reduced, and the accuracy and the sensitivity of the touch detection layer are improved.

Description

Display substrate and display panel Technical Field

[0001] The present disclosure belongs to the field of display technology, and particularly relates to a display substrate and a display panel. Background Art

[0002] With the increasing use of organic light-emitting diode (OLED) displays, optical under-screen fingerprint recognition has become more widely used in smartphones. Figure 1 is a schematic diagram of the OLED optical under-screen fingerprint recognition structure in the prior art. As shown in Figure 1, the technical principle of optical under-screen fingerprint recognition is that when a finger presses the screen 100, the light emitted by the OLED light-emitting device 2 is reflected when it hits the finger, and the touch detection layer 1 receives the reflected light to perform fingerprint recognition.

[0003] Quantum dots (QDs) feature continuously adjustable wavelengths that vary with particle size, uniform light output, and spectrally pure light. OLEDs offer self-luminescence, high contrast, and flexibility. Therefore, products combining the two exhibit high contrast, a wide color gamut, and excellent viewing angles. Currently, this technology is being used in large-scale products such as TVs and mobile phones. With subsequent technological development, it may be applied to small and medium-sized products such as notebook computers and TPCs. These small and medium-sized products will also require optical under-screen fingerprint recognition technology to provide a better user experience.

[0004] However, in the QD-OLED device that combines QD and OLED, when the light emitted by the OLED's light-emitting device 2 passes through the QD, some interfering light will be generated and pass through the inside of the light-emitting device 2 to reach the touch detection layer 1 below, thereby interfering with optical recognition and reducing its accuracy and sensitivity.

[0005] Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art and provide a display substrate and a display panel that improve the accuracy and sensitivity of optical recognition.

[0007] In a first aspect, the technical solution adopted to solve the technical problem of the present invention is a display substrate, which includes:

[0008] substrate;

[0009] a light-emitting device layer, disposed on the base substrate, the light-emitting device layer comprising a plurality of light-emitting devices, and the light-emitting devices are configured to emit light of a first color;

[0010] a quantum dot layer disposed on a side of the light-emitting device layer facing away from the substrate, the quantum dot layer comprising at least a first quantum dot unit and a second quantum dot unit, the first quantum dot unit being configured to emit a second color light under the excitation of the first color light, and the second quantum dot unit being configured to emit a third color light under the excitation of the first color light;

[0011] a touch detection layer, disposed on a side of the light-emitting device layer away from the quantum dot layer, and configured to determine touch information based on the light signal it receives;

[0012] An auxiliary functional layer is provided between the quantum dot layer and the light-emitting device layer; wherein the auxiliary functional layer is configured to transmit the first color light and reflect the second color light and the third color light.

[0013] In some embodiments, an encapsulation layer is provided on a side of the light-emitting device layer facing away from the base substrate, and the auxiliary function layer is provided between the encapsulation layer and the quantum dot layer.

[0014] In some embodiments, the auxiliary functional layer includes multiple sub-functional layers stacked in sequence along a direction away from the base substrate, and in the direction in which the quantum dot layer points to the base substrate, the refractive index of the sub-functional layer located in the odd-numbered layer is a first refractive index, and the refractive index of the sub-functional layer located in the even-numbered layer is a second refractive index, and the first refractive index is greater than the second refractive index.

[0015] In some embodiments, the first refractive index ranges from 1.85 to 1.95; and the second refractive index ranges from 1.2 to 1.4.

[0016] In some embodiments, the thickness of the sub-functional layer located in the odd-numbered layers ranges from 0.5 μm to 2.0 μm; the thickness of the sub-functional layer located in the even-numbered layers ranges from 1.0 μm to 2.0 μm.

[0017] In some embodiments, the display substrate includes a first sub-pixel, a second sub-pixel, and a third sub-pixel that respectively emit first color light, second color light, and third color light, wherein the first sub-pixel includes one of the light-emitting devices; the second sub-pixel includes one of the light-emitting devices and one of the first quantum dot units; and the third sub-pixel includes one of the light-emitting devices and one of the second quantum dot units.

[0018] In some embodiments, the display substrate includes a light-blocking layer located on the side of the auxiliary functional layer away from the base substrate, the light-blocking layer includes a first accommodating portion for transmitting the first color light emitted by the light-emitting device in the first sub-pixel, a second accommodating portion for accommodating the first quantum dot unit, a third accommodating portion for accommodating the second quantum dot unit, and a first blocking portion defining the first accommodating portion, the second accommodating portion and the third accommodating portion; the first blocking portion has at least one first opening extending through the first accommodating portion along its thickness direction.

[0019] In some embodiments, the display substrate is divided into a plurality of pixel units arranged in an array, each of the pixel units includes a first sub-pixel, a second sub-pixel and a third sub-pixel; an opening area is defined between any four pixel units arranged in an array, and the first opening is located in the opening area.

[0020] In some embodiments, when the orthographic projections of the first accommodating portion, the second accommodating portion, and the third accommodating portion on the base substrate are all octagons, the orthographic projection of the opening area on the base substrate is a regular decagon, and the first opening is provided on at least one of the center of the regular decagon, the center of the side, the vertex, the midpoint of the line connecting the vertex and the center, and the midpoint of the line connecting the center of the side and the center.

[0021] In some embodiments, a distance between the center of the regular decagon and any vertex of the regular decagon is 20 μm to 50 μm.

[0022] In some embodiments, the area of ​​the decagon is 1 / 5S to S, where S is the area of ​​the orthographic projection of a single pixel unit on the substrate.

[0023] In some embodiments, the orthographic projection area of ​​each first opening on the substrate is 1 / 60S to 1 / 14S; for each first opening in an opening area, the total orthographic projection area of ​​the plurality of first openings on the substrate is 1 / 8S to 1 / 2S.

[0024] In some embodiments, when the orthographic projections of the first accommodating portion, the second accommodating portion, and the third accommodating portion on the base substrate are all rectangular, the orthographic projection of the opening area on the base substrate is a square, and the first opening is provided on at least one of the six of the center, vertex, center of the edge, midpoint of the line connecting the vertex and the center, midpoint of the line connecting the vertex and the center of the edge, and midpoint of the line connecting the center and the center of the edge of the square.

[0025] In some embodiments, the side length of the square is 40 μm to 120 μm.

[0026] In some embodiments, the area of ​​the square is 1 / 4S to S, where S is the area of ​​a single pixel unit on the substrate.

[0027] In some embodiments, the orthographic projection area of ​​each first opening on the substrate is 1 / 100S to 1 / 20S; for each first opening in an opening area, the total orthographic projection area of ​​the plurality of first openings on the substrate is 1 / 8S to 1 / 2S.

[0028] In some embodiments, the light-emitting device layer includes a pixel defining layer, which is a light-shielding layer and includes a fourth accommodating portion and a second blocking portion that defines the fourth accommodating portion. The second blocking portion has a second opening, and the second opening is arranged one-to-one with the first opening.

[0029] In some embodiments, the display substrate also includes a color filter layer located on the side of the quantum dot layer away from the light-emitting device layer, the color filter layer includes a black matrix and a color filter; the black matrix includes a light-transmitting portion and a third blocking portion that defines the light-transmitting portion, the third blocking portion has a third opening, and the third opening is arranged one-to-one corresponding to the first opening.

[0030] In some embodiments, the display substrate further includes a scattering particle unit, and the first receiving portion is used to receive the scattering particle unit and is configured to scatter the first color light.

[0031] In some embodiments, the scattering particle unit includes a first scattering particle unit and a second scattering particle unit arranged in sequence away from the touch detection layer, the solid content of the scattering particles in the first scattering particle unit is 1% to 2%; the solid content of the scattering particles in the second scattering particle unit is 4% to 8%.

[0032] In some embodiments, the scattering particle unit includes a first scattering particle unit and a second scattering particle unit arranged in sequence away from the touch detection layer, the thickness of the first scattering particle unit is 1 / 2h to 4 / 5h; the thickness of the second scattering particle unit is 1 / 5h to 1 / 2h; h is the total thickness of the scattering particle unit.

[0033] In some embodiments, the scattering particle unit includes a first scattering particle unit, a second scattering particle unit, and a third scattering particle unit, which are arranged in sequence away from the touch detection layer. The solid content of the scattering particles in the first scattering particle unit is 1% to 2%; the solid content of the scattering particles in the second scattering particle unit is 2% to 4%; and the solid content of the scattering particles in the third scattering particle unit is 4% to 6%.

[0034] In some embodiments, the scattering particle unit includes a first scattering particle unit, a second scattering particle unit, and a third scattering particle unit, which are arranged in sequence away from the touch detection layer. The thickness of the first scattering particle unit is 1 / 3h to 1 / 2h; the thickness of the second scattering particle unit is 1 / 6h to 1 / 3h; the thickness of the third scattering particle unit is 1 / 3h to 1 / 2h; and h is the total thickness of the scattering particle units.

[0035] In some embodiments, the display substrate further includes an optical adhesive unit, and the first receiving portion is used to receive the optical adhesive unit.

[0036] In some embodiments, the device further includes a color filter layer located on a side of the quantum dot layer away from the light-emitting device layer, the color filter layer including a black matrix and a first structure, a second color filter, and a third color filter; the second color filter is provided in a one-to-one correspondence with the first quantum dot unit; the third color filter is provided in a one-to-one correspondence with the second quantum dot unit; the first structure is provided in a one-to-one correspondence with the optical adhesive unit;

[0037] The first structure is further configured to scatter the first color light.

[0038] In some embodiments, the material of the first structure is a mixture of a first color filter material and a scattering particle material, and the solid content of the scattering particles is 6% to 8%.

[0039] In some embodiments, the first structure includes a first color filter unit and a scattering particle unit sequentially arranged away from the quantum dot layer.

[0040] In some embodiments, the thickness of the scattering particle unit is greater than or equal to the thickness of the first color filter unit.

[0041] In a second aspect, an embodiment of the present disclosure further provides a display panel, which includes a display substrate as described in any one of the above-mentioned first aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 is a schematic diagram of an OLED optical under-screen fingerprint recognition structure in the prior art;

[0043] FIG2 is a schematic diagram of a QD-OLED optical under-screen fingerprint recognition structure in the prior art;

[0044] FIG3 is a schematic diagram of a display substrate provided in an embodiment of the present disclosure;

[0045] FIG4 is a schematic diagram of the reflectivity of an encapsulation layer in different wavelength bands provided by an embodiment of the present disclosure;

[0046] FIG5 is a schematic diagram of an optical path of an auxiliary functional layer provided by an embodiment of the present disclosure;

[0047] FIG6 is a schematic diagram of an LR1 structure provided by an embodiment of the present disclosure;

[0048] FIG7 is a schematic diagram of the reflectivity of different wavelengths in MOF corresponding to Table 1;

[0049] FIG8 is a schematic diagram of a pixel unit arrangement provided by an embodiment of the present disclosure;

[0050] 9-11 are schematic diagrams of a first opening position provided by an embodiment of the present disclosure;

[0051] FIG12 is a schematic diagram of another pixel unit arrangement provided by an embodiment of the present disclosure;

[0052] 13-15 are schematic diagrams of another first opening position provided by an embodiment of the present disclosure;

[0053] FIG16a-FIG16b are schematic diagrams of a scattering particle unit provided by an embodiment of the present disclosure;

[0054] 17a-17b are schematic diagrams of another scattering particle unit provided by an embodiment of the present disclosure;

[0055] FIG18 is a schematic diagram of another display substrate provided by an embodiment of the present disclosure;

[0056] FIG19 is a schematic diagram of a first structure provided by an embodiment of the present disclosure;

[0057] FIG20 is a schematic diagram of another first structure provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0058] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0059] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0060] Figure 2 is a schematic diagram of a conventional QD-OLED optical under-screen fingerprint recognition structure. As shown in Figure 2, light-emitting device 2 emits a first color of light. A portion of the first color of light emitted by light-emitting device 2 excites quantum dot layer (QD layer) 3, converting the first color conversion layer into light of a corresponding color (e.g., red or green). This light then exits onto screen surface 100 and reflects at the finger contact location. It then passes through the interior of light-emitting device 2 and reaches the touch detection layer 1 below (as indicated by light rays 4, 5, and 6 in the figure). This portion of light is used for touch detection, such as fingerprint recognition. However, another portion of the first color of light emitted by light-emitting device 2, due to the uniformity of the light emitted by QD layer 3, generates light emitted downward from below QD layer 3 after converting the first color conversion layer into light of a corresponding color. This light then passes through the interior of light-emitting device 2 and reaches the touch detection layer 1 below (as indicated by light rays 1, 3, and 2 in the figure). This portion of light is unrelated to touch detection on screen surface 100 and therefore interferes with touch detection layer 1, reducing its accuracy and sensitivity.

[0061] In order to solve the problems existing in the prior art, an embodiment of the present disclosure provides a display substrate. FIG3 is a schematic diagram of a display substrate provided by an embodiment of the present disclosure. As shown in Figure 3, the display substrate includes: a base substrate 101, a light-emitting device layer, a quantum dot layer 3, a touch detection layer 1 and an auxiliary function layer 4; wherein the light-emitting device layer is arranged on the base substrate 101, the light-emitting device layer includes a plurality of light-emitting devices 2, and the light-emitting device 2 is configured to emit a first color light; the quantum dot layer 3 is arranged on the side of the light-emitting device layer away from the base substrate 101, the quantum dot layer 3 includes at least a first quantum dot unit 301 and a second quantum dot unit 302, the first quantum dot unit 301 is configured to emit a second color light under the excitation of the first color light, and the second quantum dot unit 302 is configured to emit a third color light under the excitation of the first color light; the touch detection layer 1 is arranged on the side of the light-emitting device layer away from the quantum dot layer 3, and is configured to determine touch information based on the light signal it receives; the auxiliary function layer 4 is arranged between the quantum dot layer 3 and the light-emitting device layer; wherein the auxiliary function layer 4 is configured to transmit the first color light and reflect the second color light and the third color light.

[0062] Specifically, quantum dot layer 3 comprises multiple quantum dot units, each of which is a semiconductor crystal between 2 and 10 nanometers in size. When semiconductor crystals are reduced to the nanometer scale, different sizes of semiconductor crystals can emit different colors of light when excited. For example, when a semiconductor nanocrystal made of cadmium selenide is excited, a 2-nanometer crystal emits blue light, while an 8-nanometer crystal emits red light. Intermediate sizes emit green, yellow, orange, and so on. Depending on the chemical composition and size of the quantum dot unit, the emission color can cover the entire visible range, from blue to red, with high color purity and continuous tunability.

[0063] The first color light emitted by the light-emitting device 2 can be blue light. The first quantum dot unit 301 can be a red quantum dot (RQD), and the second quantum dot unit 302 can be a green quantum dot (GQD). Each light-emitting device 2 in the light-emitting device layer emits blue light, which excites the RQD to form red light (second color light) and excites the GQD to form green light (third color light). Of course, the first color light emitted by the light-emitting device 2 can also be other color light, such as white light, red light, purple light, etc.; the first quantum dot unit 301 and the second quantum dot unit 302 can also be other color quantum dots, such as orange quantum dots, yellow quantum dots, etc., according to their different chemical compositions and sizes. This disclosure does not limit this. In addition, the light-emitting device 2 and the quantum dot unit (such as the first quantum dot unit 301 and the second quantum dot unit 302) can be set correspondingly or not, as long as the first color light emitted by the light-emitting device 2 can excite the quantum dot unit to form light of the corresponding color.

[0064] It should be noted that all embodiments of the present disclosure are described only by taking the example that the first color light is blue light, the first quantum dot unit 301 is a red quantum dot (RQD), and the second quantum dot unit 302 is a green quantum dot (GQD), which does not constitute a limitation to the embodiments of the present disclosure.

[0065] The touch detection layer 1 is disposed below the light-emitting device layer and is used to detect the reflected light generated by the touch of the light emitted by the light-emitting device 2 to determine touch information. Optionally, the touch detection layer 1 can be disposed on the side of the base substrate 101 close to the light-emitting device layer, or on the side of the base substrate 101 away from the light-emitting device layer, which is not limited in this disclosure.

[0066] Since the light emitted by RQD and GQD itself is uniform in all aspects and satisfies the Lambertian distribution, after the first color light passes through the QD layer 3 and emits the second color light and the third color light, the second color light and the third color light are evenly emitted in all directions. Therefore, part of the second color light and the third color light will directly pass through the light-emitting device 2 and be emitted to the touch detection layer 1, causing interference to the detection result of the touch detection layer 1, affecting its accuracy and sensitivity. In Figure 2, the light corresponding to ③ and ⑤ is the first color light, the light corresponding to ① and ④ is the second color light, and the light corresponding to ② and ⑥ is the third color light. According to the embodiment corresponding to Figure 2, it can be seen that ①, ②, and ③ are the interference light of the touch detection layer 1, and ④, ⑤, and ⑥ are the light reflected by the finger touch, that is, the light signal that the touch detection layer 1 needs to detect.

[0067] In addition, since the wavelengths of different colors of light are different, the paths of the light after passing through the surface of the material with the same reflectivity are also different. The embodiment of the present disclosure reflects the second color light and the third color light by setting the auxiliary function layer 4, thereby reducing the interference light generated by the second color light and the third color light (for example, reducing the interference of ① and ② in Figure 2). On the one hand, the interference light of the second color light and the third color light directly emitted from the light emitting device 2 to the touch detection layer 1 is reduced (for example, ① and ② in Figure 2), thereby improving the detection accuracy and sensitivity of the touch detection layer 1; on the other hand, after reflection by the auxiliary function layer 4, the proportion of the second color light and the third color light emitted to the screen of the display product corresponding to the display substrate is increased, thereby improving the light output efficiency of the display product and enhancing the display effect. On the other hand, the auxiliary function layer 4 can transmit the first color light (for example, ③ and ⑤ in Figure 2), and can ensure that the reflected light caused by touch (for example, ⑤ in Figure 2) can reach the touch detection layer 1, without affecting the touch detection layer 1 receiving the light signal to determine the touch information.

[0068] The disclosed embodiment provides an auxiliary function layer 4 between the quantum dot layer 3 and the light-emitting device layer. By reflecting the second and third color lights, the optical paths of the second and third color lights toward the touch detection layer 1 are altered, thereby reducing the proportion of the second and third color lights emitted toward the touch detection layer 1 and reducing interference with the touch detection layer 1. Simultaneously, the proportion of the second and third color lights emitted toward the display product screen is increased, improving their frontal light output efficiency and enhancing the display effect. Furthermore, the auxiliary function layer 4 can transmit the first color light, without affecting the touch detection layer 1's detection of the optical signal corresponding to the touch.

[0069] In some embodiments, the display substrate includes not only a base substrate 101, a light-emitting device layer, a quantum dot layer 3, a touch detection layer 1, and an auxiliary function layer 4, but also an encapsulation layer 201. The encapsulation layer 201 is disposed on a side of the light-emitting device layer facing away from the base substrate 101, and the auxiliary function layer 4 is disposed between the encapsulation layer 201 and the quantum dot layer 3.

[0070] Specifically, the encapsulation layer (thin film encapsulation, TFE) 201 may include one or more layers, mainly composed of an inorganic layer and an organic layer. Optionally, the encapsulation layer 201 includes a first inorganic encapsulation thin film layer IOL1, an organic encapsulation thin film layer OL1, and a second inorganic encapsulation thin film layer IOL2 stacked in sequence. Among them, the main material of IOL1 can be SiNOx, and its film thickness can be set to 0.8μm~1.0μm, and its refractive index is 1.70~1.75; the main material of OL1 is methyl methacrylate (abbreviated as: PMMA), and its film thickness can be set to 8μm~12μm, and its refractive index is 1.50~1.60; the main material of IOL2 is SiNx, and its film thickness can be set to 0.5μm~0.8μm, and its refractive index is 1.80~1.95. Optionally, the encapsulation layer 201 can be produced by PECVD process or inkjet printing.

[0071] FIG4 is a schematic diagram of the reflectivity of an encapsulation layer in different wavelength bands provided by an embodiment of the present disclosure. As shown in FIG4 , the coordinate along the first direction x represents the wavelength band, and the coordinate along the second direction y represents the reflectivity. L1 is the reflectivity curve corresponding to different wavelength bands, L2 is the wavelength curve corresponding to red light corresponding to RQD, and L3 is the wavelength curve corresponding to green light corresponding to GQD. As can be seen from FIG4 , the reflectivity of the encapsulation layer 201 in the RQD wavelength band (630nm) is approximately 21%; the reflectivity in the GQD wavelength band (532nm) is approximately 20%; and its reflectivity in the backlight blue light band (the wavelength curve of blue light is not shown in FIG4 , and the wavelength of blue light is concentrated around 460nm) is approximately 10%. Therefore, it can be seen that the reflectivity of the encapsulation layer 201 for red and green light is relatively low, and a large portion of the red and green light will still pass through the light-emitting device layer and enter the touch detection layer 1, thereby interfering with the detection of the touch detection layer 1.

[0072] In order to improve the reflectivity of the film layer below the QD layer 3 for the R / G QD light output, the embodiment of the present disclosure sets an auxiliary functional layer 4 on the side of the existing packaging layer 201 away from the light-emitting device layer. By adjusting the refractive index n and the film thickness of the auxiliary functional layer 4, the purpose of improving the reflectivity of the R / G QD output light in the auxiliary functional layer 4 is achieved.

[0073] In some embodiments, the auxiliary functional layer 4 includes multiple sub-functional layers stacked in sequence along a direction away from the base substrate 101, and in the direction from the quantum dot layer 3 to the base substrate 101, the refractive index of the sub-functional layer located in the odd layer is a first refractive index n1, and the refractive index of the sub-functional layer located in the even layer is a second refractive index n2, and the first refractive index n1 is greater than the second refractive index n2.

[0074] Specifically, the auxiliary functional layer 4's multiple sub-functional layers have alternating refractive indices, resulting in greater uniformity in the reflected light. In some embodiments, the first refractive index n1 is greater than that of the quantum dot layer 3, while the second refractive index n2 is less than that of the quantum dot layer 3. This arrangement ensures that red and green light incident on the auxiliary functional layer 4 are reflected to a greater extent, reducing interference with the touch detection layer 1 and improving the accuracy and sensitivity of the touch detection layer 1.

[0075] In some embodiments, the first refractive index ranges from 1.85 to 1.95, and the second refractive index ranges from 1.2 to 1.4. In some embodiments, the thickness of the sub-functional layer in the odd-numbered layers ranges from 0.5 μm to 2.0 μm, and the thickness of the sub-functional layer in the even-numbered layers ranges from 1.0 μm to 2.0 μm.

[0076] Specifically, Figure 5 is a schematic diagram of the optical path of an auxiliary functional layer provided in an embodiment of the present disclosure. As shown in Figure 5, the auxiliary functional layer 4 is disposed above the encapsulation layer 201. The encapsulation layer 201 includes a first inorganic encapsulation layer IOL1, an organic layer OL1, and a second inorganic encapsulation layer ILO2, which are sequentially disposed near the auxiliary functional layer. The auxiliary functional layer 4 includes six sub-functional layers, namely M1, M2, M3, M4, M5, and M6, which are sequentially disposed near the encapsulation layer 201.

[0077] Among them, M1, M3, and M5 have high refractive index, and their refractive index range can be set to 1.85-1.95, and their film thickness can be set to 0.5μm-2.0μm. Their materials can include but are not limited to SiNx, SiNOx, TiO2, ZnO, ZrO2, etc. M2, M4, and M6 have low refractive index, and their refractive index range can be set to 1.45-1.6, and their film thickness can be set to 0.5μm-2.0μm. Their materials can include but are not limited to organic materials such as acrylic resin, polyurethane resin, silicone resin, silane resin, epoxy resin, etc., or inorganic materials such as ZnO, Al2O3, SiO2, etc.

[0078] In some embodiments, in the direction from the quantum dot layer 3 to the base substrate 101 , the sub-functional layers located in the even layers (eg, M2 , M4 , and M6 in FIG. 5 ) may also be the organic film layer LR1 doped with hollow particles.

[0079] Specifically, Figure 6 is a schematic diagram of an LR1 structure provided in an embodiment of the present disclosure. As shown in Figure 6, the left figure is a schematic diagram of the structure of the hollow particles, and the right figure is a schematic diagram of the organic film layer LR1. Referring to the left figure in Figure 6, the hollow particles are a core-shell structure, the shell of which is mainly composed of SiO2, and the encapsulation is air, the concentration of which in the organic matrix material of the organic film layer LRI is 20% to 40%. In some embodiments, the refractive index of the organic film layer LR1 can be set to a range of 1.2 to 1.4, and the film thickness can be set to 1.0 μm to 2.0 μm, wherein the organic matrix material of the organic film layer LRI can be silane resin, epoxy resin, etc.

[0080] It can be understood that the materials, reflectivity values, and film thicknesses of the odd-numbered layers in the above embodiments can be the same or different; similarly, the materials, reflectivity values, and film thicknesses of the even-numbered layers can be the same or different, as long as they are within the above-defined range, and the present disclosure does not impose any restrictions on this.

[0081] Table 1 shows the correspondence between the auxiliary functional layer (MOF) 4 and the R / G / B reflectivity. Figure 7 is a schematic diagram of the reflectivity of different bands in MOF corresponding to Table 1. In Figure 7, the coordinate along the first direction x represents the band, and the coordinate along the second direction y represents the reflectivity. L2 is the band curve corresponding to the red light corresponding to RQD, and L3 is the band curve corresponding to the green light corresponding to GQD. L1 is the reflectivity curve of the auxiliary functional layer (MOF) 4 corresponding to the comparative example in Table 1 in different bands, and L11 to L15 are the reflectivity curves of the auxiliary functional layer (MOF) 4 corresponding to Examples 1 to 5 in Table 1 in different bands.

[0082] Table 1 shows the corresponding relationship between the auxiliary functional layer (MOF) 4 and the R / G / B reflectivity

[0083] According to the various embodiments in Table 1 and Figure 7, compared with the comparative example, the reflectivity of R / G is improved, and the reflectivity of B is reduced, indicating that the reflection effect on the light emitted by R / G is enhanced after adding MOF4. The reflectivities of R / G in Example 5 are 99.1% and 90%, respectively, which are close to total reflection. Therefore, the MOF4 corresponding to Example 5 can effectively reduce the light emitted from R / G from below to reach the surface of the touch detection layer 1, avoiding interference with the detection of the touch detection layer 1, thereby improving the accuracy and sensitivity of the touch detection layer 1. At the same time, as the R / G light emitted by MOF4 is reflected, the light extraction from the front of the display product can be improved, and the efficiency of the QD-OLED device can be improved. At the same time, the reflectivity of blue light in Example 5 is 0.3%, which is almost completely transparent, and can further improve the efficiency of the device.

[0084] In some embodiments, the display substrate includes a first sub-pixel, a second sub-pixel, and a third sub-pixel that respectively emit first color light, second color light, and third color light, wherein the first sub-pixel includes a light-emitting device 2; the second sub-pixel includes a light-emitting device 2 and a first quantum dot unit 301; and the third sub-pixel includes a light-emitting device 2 and a second quantum dot unit 302.

[0085] 3 , the light-emitting devices 2 are arranged correspondingly to the first quantum dot units 301 and the second quantum dot units 302. This arrangement enables the first color light emitted by each light-emitting device 2 to better excite the first quantum dot units 301 and the second quantum dot units 302 in the quantum dot layer 3 to emit light of the corresponding color.

[0086] In some embodiments, the display substrate not only includes a base substrate 101, a light-emitting device layer, a quantum dot layer 3, a touch detection layer 1, an auxiliary function layer 4, and an encapsulation layer 201, but also includes a light-blocking layer 5 located on the side of the auxiliary function layer 4 away from the base substrate 101. The light-blocking layer 5 includes a first accommodating portion for transmitting the first color light emitted by the light-emitting device 2 in the first sub-pixel, a second accommodating portion for accommodating the first quantum dot unit 301, a third accommodating portion for accommodating the second quantum dot unit 302, and a first blocking portion defining the first accommodating portion, the second accommodating portion, and the third accommodating portion; the first blocking portion has at least one first opening extending through the first sub-pixel.

[0087] Specifically, the interfering light rays ①, ②, and ③ in Figure 2 can be reflected by the auxiliary functional layer 4 provided on the display substrate, thereby reducing the interference of ① and ② on the touch detection layer 1. Regarding the first-color light rays ③ and ⑤, ③ is the interfering light that interferes with the touch detection layer 1, while ⑤ is the effective reflected light generated by the touch. Both are the same color light, and their wavelengths remain essentially unchanged, but the spectrum of the light obtained through different optical paths will change.

[0088] Taking ③ and ⑤ in Figure 2 as an example, the spectrum of blue light is typically set to 480nm-485nm. ③ is generated by blue light emitted downward from below the quantum dot layer 3; ⑤ is generated by blue light passing through the quantum dot layer 3, exiting the screen, first reflecting at the touch location, and then passing through the quantum dot layer 3 to finally exit ⑤. In some embodiments, the first receiving portion houses scattering particle units and is configured to scatter the first color light. ③ is emitted downward from below the quantum dot layer 3, while ⑤, having passed through the quantum dot layer 3 twice, is fully dispersed by the scattering particle units, resulting in a spectrum of approximately 450nm for ⑤. Therefore, the spectrum of ③ remains approximately 480nm-485nm, while the spectrum of ⑤ is reduced. Based on the difference in the two spectra, a suitable material is selected for the first blocking portion of the light-blocking layer 5, so that the first blocking portion of the light-blocking layer 5 only absorbs interfering light (e.g., ③) in the first color light. At the same time, a first opening is provided in the first blocking portion to transmit the effective light (e.g., ⑤) in the first color light, enabling the touch detection layer 1 to detect touch signals. There may be one or more first openings, and the first openings may be provided at any position of the first blocking portion, as long as the first openings can transmit light reflected from the touch position.

[0089] In some embodiments, the display substrate is divided into a plurality of pixel units arranged in an array, each pixel unit includes a first sub-pixel, a second sub-pixel and a third sub-pixel; an opening area is defined between any four pixel units arranged in the array, and the first opening is located in the opening area.

[0090] Specifically, the first sub-pixel can be a blue sub-pixel, the second sub-pixel can be a red sub-pixel, and the third sub-pixel can be a green sub-pixel. The position of the first opening is different, and its transmission effect on the light reflected from the touch position (such as ⑤ in Figure 2) is different. At the same time, the arrangement of the pixel units is different, which will also affect its transmission effect on the light reflected from the touch position (such as ⑤ in Figure 2). In the embodiment of the present disclosure, an opening area is defined based on the arrangement of the pixel units, and a first opening is provided in the opening area, which can better enable the first opening to transmit the light reflected from the touch position, thereby improving the accuracy and sensitivity of the touch display layer 1.

[0091] In some embodiments, the shape of the orthographic projection of the first opening on the base substrate 101 can be set to a polygon such as a quadrilateral, a triangle, a hexagon, or a circle. The present disclosure does not limit the specific shape of the first opening.

[0092] In some embodiments, the plurality of first openings are centrally symmetrically arranged about the center of the opening region on the base substrate 101. This arrangement can make the first color light transmitted through the first openings to the touch detection layer 1 more uniform, thereby making detection more accurate.

[0093] In some embodiments, when the orthographic projections of the first accommodating portion, the second accommodating portion, and the third accommodating portion on the base substrate 101 are all octagons, the orthographic projection of the opening area on the base substrate 101 is a regular decagon, and a first opening is provided on at least one of the center of the regular decagon, the center of the side, the vertex, the midpoint of the line connecting the vertex and the center, and the midpoint of the line connecting the center of the side and the center.

[0094] Specifically, the orthographic projections of the first, second and third accommodating portions on the base substrate 101 are octagons, that is, the orthographic projections of the first, second and third subpixels on the base substrate 101 are also octagons.

[0095] FIG8 is a schematic diagram of a pixel unit arrangement provided by an embodiment of the present disclosure.

[0096] 8 takes the case where the first sub-pixel is a blue sub-pixel B, the second sub-pixel is a red sub-pixel R, and the third sub-pixel is a green sub-pixel G as an example to illustrate the specific shapes of the orthographic projections of the first sub-pixel, the second sub-pixel, and the third sub-pixel on the base substrate 101 .

[0097] As shown in Figure 8, the green subpixel G includes two first sides g1, two second sides g2, and four third sides g3. The two first sides g1 are arranged parallel to each other along a first direction, the two second sides g2 are arranged parallel to each other along a second direction, and the first sides g1 and second sides g2 are sequentially connected by the third sides g3. The blue subpixel B includes a fourth side b1, a fifth side b2, a sixth side b3, a seventh side b4, an eighth side b5, a ninth side b6, a tenth side b7, and an eleventh side b8, which are sequentially connected. The fourth side b1 and the eighth side b5 are parallel to each other along the first direction, the sixth side b3 and the tenth side b7 are parallel to each other along the second direction, and the length of the sixth side b3 is shorter than the length of the tenth side b7. The red subpixel R includes a twelfth side r1, a thirteenth side r2, a fourteenth side r3, a fifteenth side r4, a sixteenth side r5, a seventeenth side r6, an eighteenth side r7, and a nineteenth side r8, which are sequentially connected. The twelfth side r1 and the sixteenth side r5 are arranged parallel to each other along the first direction, the fourteenth side r3 and the eighteenth side r7 are arranged parallel to each other along the second direction, and the length of the fourteenth side r3 is greater than that of the eighteenth side r7.

[0098] In some embodiments, the aperture ratio of the green sub-pixel can be 1.8 to 2.0; the aperture ratio of the red sub-pixel can be 1.4 to 1.6. The ratio of the aperture ratios of the green sub-pixel, the red sub-pixel, and the blue sub-pixel satisfies the following: 1.8:1.6:1≤x≤2.0:1.4:1. This arrangement satisfies the requirement for light to pass through. This disclosure does not impose any restrictions on the specific sizes of the green, red, and blue sub-pixels, as long as they meet the aforementioned aperture ratio requirements.

[0099] When the orthographic projections of the first receiving portion, the second receiving portion, and the third receiving portion on the base substrate 101 are all octagons, the orthographic projection of the opening area on the base substrate 101 is a regular decagon.

[0100] Specifically, still referring to Figure 8, the opening area defined by any four pixel units arranged in an array is described in detail. For any four pixel units arranged in an array: between the first pixel unit, the second pixel unit, the third pixel unit and the fourth pixel unit, wherein the first pixel unit and the second pixel unit are arranged along the first direction x, the third pixel unit and the fourth pixel unit are arranged along the first direction x, and the first pixel unit and the third pixel unit are arranged along the second direction y. In order to better match the design arrangement of the pixel unit, the range of its opening area is set to the dotted area in Figure 8, and the opening area is an equilateral decagon, and the angle a between the two adjacent sides is (n-2)*180° / 10=144°. The specific relative position relationship between the opening area and the four pixel units arranged in an array is described below.

[0101] Specifically, as shown in Figure 8, the distance from the vertex of the angle between two adjacent sides of the decagon to the center position of the decagon is set to r, and a straight line l1 parallel to the first direction x is drawn, and the edge intersections with the two green sub-pixels G of the third pixel unit and the fourth pixel unit are h1 and h2; the distance between h1 and the green sub-pixel G of the third pixel unit is H1, and the distance between h2 and the green sub-pixel G of the fourth pixel unit is H2.

[0102] A straight line l2 is drawn by rotating 60° clockwise along the first direction x, intersecting the edges of the red sub-pixel R of the first pixel unit and the blue sub-pixel B of the fourth pixel unit at h3 and h4; the distance between h3 and the red sub-pixel R of the first pixel unit is H3, and the distance between h4 and the blue sub-pixel B of the fourth pixel unit is H4.

[0103] A straight line l3 is drawn by rotating 120° clockwise along the first direction x, and its intersection points with the edges of the blue pixel B of the second pixel unit and the red sub-pixel R of the third pixel unit are h5 and h6; the distance between h5 and the blue pixel B of the second pixel unit is H5, and the distance between h6 and the red sub-pixel R of the third pixel unit is H6.

[0104] In some embodiments, 1 / 10r≤H1=H2≤1 / 4r, 1 / 10r≤H3, H4, H5, H6≤1 / 5r. In some embodiments, H3 and H4 may be equal or different. In some embodiments, H5 and H6 may be equal or different.

[0105] In some embodiments, a distance r between the center of the regular decagon and any vertex of the regular decagon is 20 μm to 50 μm.

[0106] In some embodiments, the area of ​​the decagon is 1 / 5S to S, where S is the area of ​​the orthographic projection of a single pixel unit on the substrate 101. The area of ​​the orthographic projection of a single pixel unit on the substrate 101 refers to the sum of the areas of the orthographic projections of the contours of the first, second, and third sub-pixels formed by connecting their edges on the substrate 101.

[0107] In some embodiments, the orthographic projection area of ​​each first opening on the base substrate 101 is 1 / 60S to 1 / 14S. For each first opening within an opening region, the total orthographic projection area of ​​the plurality of first openings on the base substrate is 1 / 8S to 1 / 2S. This configuration ensures that the first openings meet the transmission requirements for the first color light, allowing the touch detection layer 1 to detect the received optical signal.

[0108] Figures 9-11 are schematic diagrams of the position of a first opening provided in an embodiment of the present disclosure. Figures 9-11 are schematic diagrams of the position of the first opening when the orthographic projections of the first, second, and third accommodating portions on the base substrate 101 are all octagons, and the orthographic projection of the opening area on the base substrate 101 is a regular decagon.

[0109] In Figure 9, the first openings are located at the center of the opening region, at the midpoint of the line connecting the center of the opening region and a vertex, and at the midpoint of the line connecting the center of the opening region and the center of an edge, and are located on l1, l2, and l3. In some embodiments, the orthographic projection area of ​​each first opening on the base substrate 101 is 1 / 60S to 1 / 14S; for each first opening within an opening region, the total orthographic projection area of ​​the multiple first openings on the base substrate is 1 / 8S to 1 / 2S. This configuration ensures that the first openings meet the transmission requirements for the first color light, allowing the touch detection layer 1 to detect the received light signal.

[0110] In Figure 10, based on the corresponding embodiment of Figure 9, first openings are also provided at the midpoints of the edges of the opening region and at the vertices of the opening region, and these first openings are located on l1, l2, and l3. In some embodiments, the area of ​​the orthographic projection of each first opening on the base substrate 101 is 1 / 60S to 1 / 20S; for each first opening within an opening region, the total area of ​​the orthographic projection of the multiple first openings on the base substrate is 1 / 6S to 1 / 2S. As the number of first openings increases, the area of ​​the orthographic projection of the first openings on the base substrate 101 gradually decreases, while for each first opening within an opening region, the total area of ​​the orthographic projection of the multiple first openings on the base substrate gradually increases. This configuration ensures that the first openings meet the transmission requirements for the first color light, allowing the touch detection layer 1 to detect the received light signal.

[0111] In Figure 11, based on the embodiment corresponding to Figure 10, a first opening is provided at the center of the remaining sides of the opening region. In some embodiments, the orthographic projection area of ​​each first opening on the base substrate 101 is 1 / 60S to 1 / 40S; for each first opening within an opening region, the total orthographic projection area of ​​the multiple first openings on the base substrate is 1 / 4S to 1 / 2S. Compared to the embodiment corresponding to Figure 10, the orthographic projection area of ​​the first openings on the base substrate 101 is smaller, while for each first opening within an opening region, the total orthographic projection area of ​​the multiple first openings on the base substrate is larger. This arrangement ensures that the first openings meet the transmission requirements for the first color light, allowing the touch detection layer 1 to detect the received optical signal.

[0112] In the embodiments corresponding to Figures 9-11, the orthographic projection of the first opening on the substrate 101 is only used as an example to illustrate that the shape of the orthographic projection of the first opening on the substrate 101 can be set to a quadrilateral. It is understood that the shape of the orthographic projection of the first opening on the substrate 101 can also be a polygon such as a triangle or a hexagon, or a circle. The present disclosure does not limit the specific shape of the first opening. Of course, the position of the first opening can also be set at other positions in the opening area, and the present disclosure does not limit this.

[0113] In some embodiments, when the orthographic projections of the first accommodating portion, the second accommodating portion, and the third accommodating portion on the base substrate 101 are all rectangular, the orthographic projection of the opening area on the base substrate 101 is a square, and a first opening is provided on at least one of the six of the center, vertex, center of the edge, midpoint of the line connecting the vertex and the center, midpoint of the line connecting the vertex and the center of the edge, and midpoint of the line connecting the center and the center of the edge.

[0114] Specifically, the orthographic projections of the first accommodating portion, the second accommodating portion, and the third accommodating portion on the base substrate 101 are rectangular. That is, the orthographic projections of the first sub-pixel, the second sub-pixel, and the third sub-pixel on the base substrate 101 are rectangular.

[0115] FIG12 is a schematic diagram of another pixel unit arrangement provided in an embodiment of the present disclosure.

[0116] 12 takes the case where the first sub-pixel is a blue sub-pixel B, the second sub-pixel is a red sub-pixel R, and the third sub-pixel is a green sub-pixel G as an example to illustrate the specific shapes of the orthographic projections of the first sub-pixel, the second sub-pixel, and the third sub-pixel on the base substrate 101 .

[0117] As shown in Figure 12, the shapes of the orthographic projections of the blue sub-pixel B, the red sub-pixel R, and the green sub-pixel G on the substrate 101 are all square, and the areas of the orthographic projections of the three on the substrate 101 are S1, S2, and S3, respectively, and S1<S2<S3. In some embodiments, the aperture ratio of the green sub-pixel can be 1.8~2.0; the aperture ratio of the red sub-pixel can be 1.4~1.6. The ratio of the aperture ratios of the green sub-pixel, the red sub-pixel, and the blue sub-pixel satisfies: 1.8:1.6:1≤x≤2.0:1.4:1. Such an arrangement can meet the requirements for light passage. The present disclosure does not limit the specific sizes of the green sub-pixels, the red sub-pixels, and the blue sub-pixels, as long as the above-mentioned aperture ratio requirements are met.

[0118] When the orthographic projections of the first accommodation portion, the second accommodation portion, and the third accommodation portion on the base substrate 101 are all rectangular, the orthographic projection of the opening area on the base substrate 101 is a square.

[0119] Specifically, still referring to FIG12 , the opening area defined by any four pixel units arranged in an array is described in detail. For any four pixel units arranged in an array: between the fifth pixel unit, the sixth pixel unit, the seventh pixel unit and the eighth pixel unit, wherein the fifth pixel unit and the sixth pixel unit are arranged along the first direction x, the seventh pixel unit and the eighth pixel unit are arranged along the first direction x, and the fifth pixel unit and the seventh pixel unit are arranged along the second direction y. In order to better match the design arrangement of the pixel unit, the range of its opening area is set to the dotted area in FIG12 , and the opening area is square. The specific relative position relationship between the opening area and the four pixel units arranged in an array is described below.

[0120] Specifically, as shown in Figure 12, a straight line l1 is drawn parallel to the first direction x and passing through the center of the opening area. The intersection points of l1 with the edges of the two green sub-pixels G of the fifth and sixth pixel units are h1 and h2. The distance between h1 and the green sub-pixel G of the fifth pixel unit is H1, and the distance between h2 and the green sub-pixel G of the sixth pixel unit is H2. A straight line l2 is drawn parallel to the second direction y and passing through the center of the opening area. The intersection points of l2 with the edge of the red sub-pixel R of the fifth pixel unit on the side closest to its green sub-pixel G is h3, and the intersection points of l2 with the edge of the red sub-pixel R of the seventh pixel unit on the side away from its green sub-pixel G are h4. The distance between h3 and m1 is H3, and the distance between h4 and m2 is H4.

[0121] In some embodiments, 1 / 10d≤H1=H2≤1 / 5d, 1 / 8d≤H3=H4≤1 / 4d, and d is the side length of the opening area (square).

[0122] In some embodiments, the side length of the square is 40 μm to 120 μm.

[0123] In some embodiments, the area of ​​the square is 1 / 4S to S, where S is the area of ​​a single pixel unit on the substrate 101. The area of ​​the orthographic projection of a single pixel unit on the substrate 101 refers to the sum of the areas of the orthographic projections of the contours of the first, second, and third sub-pixels formed by connecting their edges on the substrate 101.

[0124] In some embodiments, the orthographic projection area of ​​each first opening on the base substrate 101 is 1 / 100S to 1 / 20S. For each of the first openings within an opening region, the total orthographic projection area of ​​the plurality of first openings on the base substrate 101 is 1 / 8S to 1 / 2S. This configuration ensures that the first openings meet the transmission requirements for the first color light, allowing the touch detection layer 1 to detect the received optical signal.

[0125] Figures 13-15 are schematic diagrams of another embodiment of the present disclosure, showing the positions of the first opening when the orthographic projections of the first, second, and third accommodating portions on the base substrate 101 are all rectangular, and the orthographic projection of the opening area on the base substrate 101 is a square.

[0126] In Figure 13 , the first openings are located at the center of the opening region, the midpoint of the line connecting the center of the opening region and the center of the edge, and the center of the edge, and are located on l1, l2, and l3. In some embodiments, the orthographic projection area of ​​each first opening on the base substrate 101 is 1 / 80S to 1 / 20S. For each first opening within an opening region, the total orthographic projection area of ​​the multiple first openings on the base substrate 101 is 1 / 8S to 1 / 2S. This arrangement ensures that the first openings meet the transmission requirements for the first color light, allowing the touch detection layer 1 to detect the received optical signal.

[0127] In Figure 14, based on the corresponding implementation of Figure 13, a first opening is also provided at the midpoint of the line connecting the midpoint of the edge of the opening area and the vertex of the opening area. In some embodiments, the area of ​​the orthographic projection of each first opening on the base substrate 101 is 1 / 80S to 1 / 40S; for each first opening within an opening area, the total area of ​​the orthographic projection of the multiple first openings on the base substrate is 1 / 4S to 1 / 2S. As the number of first openings increases, the area of ​​the orthographic projection of the first openings on the base substrate 101 gradually decreases, while for each first opening within an opening area, the total area of ​​the orthographic projection of the multiple first openings on the base substrate gradually increases. This arrangement allows the first openings to meet the transmission requirements for the first color light, so that the touch detection layer 1 can detect the received light signal.

[0128] In Figure 15 , based on the embodiment corresponding to Figure 14 , first openings are also provided at the vertices of the opening region and at the midpoints of the lines connecting the vertices and the center. In some embodiments, the area of ​​the orthographic projection of each first opening on the base substrate 101 is 1 / 100S to 1 / 50S; for each first opening within an opening region, the total area of ​​the orthographic projection of the multiple first openings on the base substrate is 1 / 3S to 1 / 2S. Compared to the embodiment corresponding to Figure 14 , the area of ​​the orthographic projection of the first openings on the base substrate 101 is smaller, while for each first opening within an opening region, the total area of ​​the orthographic projection of the multiple first openings on the base substrate is larger. This arrangement ensures that the first openings meet the transmission requirements for the first color light, allowing the touch detection layer 1 to detect the received light signal.

[0129] In the embodiments corresponding to Figures 13-15, the orthographic projection of the first opening on the substrate 101 is only described as a quadrilateral. It is understood that the orthographic projection of the first opening on the substrate 101 can also be a polygon such as a triangle or a hexagon, or a circle. The present disclosure does not limit the specific shape of the first opening. Of course, the first opening can also be located at other positions in the opening area, and the present disclosure does not limit this.

[0130] In the display substrate of the disclosed embodiment, an opening region is defined by four pixel units arranged in an array, and a first opening is provided in this opening region. This allows the display substrate to absorb the first color light (e.g., ③ in FIG2 ) emitted directly from the quantized dot layer to the touch detection layer 1, reducing interference therewith, while also ensuring that light reflected by the touch (e.g., ⑤ in FIG2 ) can penetrate the corresponding film layer and reach the touch detection layer 1 for detection. Furthermore, based on different pixel unit arrangements, the position and shape of the opening region defined by the four pixel units arranged in the array can vary; the position, number, and shape of the first openings can also vary for different opening regions.

[0131] In some embodiments, the light-emitting device layer not only includes multiple light-emitting devices 2, but also includes a pixel defining layer 6, wherein the pixel defining layer 6 is a light-shielding layer, including a fourth accommodating portion and a second blocking portion that defines the fourth accommodating portion, the second blocking portion has a second opening, and the second opening is arranged one-to-one corresponding to the first opening.

[0132] Specifically, as shown in FIG3 , the interfering light of the first color light emitted from the quantum dot layer 3 to the touch detection layer 1 (e.g., ③ in FIG2 ) and the effective light of the first color light scattered by the scattering particle unit 303, reflected by the touch, and then scattered again by the scattering particle unit 303 before finally emitting to the touch detection layer 1 (e.g., ⑤ in FIG2 ) through different optical paths have different spectra. Providing the pixel defining layer 6 as a light-shielding layer ensures that the pixel defining layer 6 absorbs the interfering light of the first color light emitted from the quantum dot layer 3 to the touch detection layer 1. At the same time, the second blocking portion of the pixel defining layer is provided with a second opening, ensuring that the first color light reflected by the touch can be emitted to the touch detection layer 1, thereby achieving touch detection.

[0133] In some embodiments, the display substrate includes not only a base substrate 101, a light-emitting device layer, a quantum dot layer 3, a touch detection layer 1, an auxiliary function layer 4, an encapsulation layer 201, and a light blocking layer 5, but also includes a color filter layer 8 located on the side of the quantum dot layer 3 away from the light-emitting device layer. The color filter layer 8 includes a black matrix 801 and a color filter 802; the black matrix 801 includes a light-transmitting portion and a third blocking portion that defines the light-transmitting portion. The third blocking portion has a third opening, and the third opening is arranged one-to-one corresponding to the first opening.

[0134] Specifically, as shown in Figure 3, the third blocking part of the black matrix 801 can ensure that the pixel defining layer 6 absorbs the interference light of the first color light that passes through the quantum dot layer 3 and is emitted to the touch detection layer 1. At the same time, a third opening is provided in the third blocking part of the black matrix 801 to ensure that the light of the first color light reflected by the touch can be emitted to the touch detection layer 1 to realize touch detection.

[0135] It should be noted that the position and shape settings of the second opening and the third opening are similar to those of the first opening, and will not be repeated here. In addition, considering that the opening rate of the quantum dot layer 3 is actually the largest compared to the color filter layer 8 and the pixel. Therefore, the area of ​​the corresponding light blocking layer 5 is the smallest, so when designing the black matrix 801 and the pixel defining layer 6, the size of the second opening and the third opening can be appropriately increased compared to the size of the first opening. In some embodiments, the ratio of the area of ​​the second opening on the substrate substrate 101 to the area of ​​the first opening on the substrate substrate 101 is 1.0 to 1.1. In some embodiments, the ratio of the area of ​​the third opening on the substrate substrate 101 to the area of ​​the first opening on the substrate substrate 101 is 1.0 to 1.1.

[0136] In some embodiments, the display substrate further includes a scattering particle unit 303 , and the first receiving portion is used to receive the scattering particle unit 303 and is configured to scatter the first color light.

[0137] Specifically, as shown in Figure 3, scattering particle units 303 are arranged in the same layer as first and second quantum dot units 301 and 302, and emit light of a first color. First quantum dot unit 301 is typically a red quantum dot unit, and second quantum dot unit 302 is typically a green quantum dot unit, resulting in blue light as the first color. Since the red and green quantum dots themselves emit uniform light, satisfying a Lambertian distribution, blue light, without the presence of scattering particles, exhibits a strong microcavity structure, with its light field distribution being strongest in the vertical direction and rapidly decreasing with increasing viewing angle. Therefore, to match the light field distribution of the quantum dots, scattering particle units 303 are required above the blue light to convert its light field distribution into a Lambertian distribution. In some embodiments, the solid content of the scattering particles in scattering particle units 303 is generally set to 1% to 10%. In some embodiments, scattering particle units 303 can be a single-layer or multi-layer structure. When scattering particle units 303 are multi-layered, the solid content of the scattering particles in scattering particle units 303 can vary and can be flexibly adjusted based on actual needs.

[0138] 16a-16b are schematic diagrams of a scattering particle unit provided in an embodiment of the present disclosure.

[0139] In some embodiments, the scattering particle unit 303 includes a first scattering particle unit 3031 and a second scattering particle unit 3032 arranged in sequence away from the touch detection layer 1. The solid content of the scattering particles in the first scattering particle unit 3031 is 1% to 2%; the solid content of the scattering particles in the second scattering particle unit 3032 is 4% to 8%.

[0140] Specifically, as shown in Figures 16a and 16b, the scattering particle unit 303 includes a two-layer scattering particle structure. The solid content of the scattering particles in the film layer close to the color filter layer 8 is higher than the solid content of the scattering particle layer in the film layer close to the auxiliary function layer. This configuration ensures that the first color light is evenly dispersed in the direction from the substrate to the screen, increasing the proportion of the first color light that passes through the scattering particle unit 303 and exits upward to the screen, thereby increasing its brightness. On the other hand, in the direction from the light-emitting device layer to the touch detection layer 1, the proportion of the first color light that passes through the scattering particle unit 303 and exits downward to the touch detection layer 1 is further reduced, thereby reducing interference with the touch detection layer 1. In addition, the specific values ​​of the scattering particle solid content in the first scattering particle unit 3031 and the second scattering particle unit 3031 can be set based on specific circumstances and are not limited in this disclosure.

[0141] In some embodiments, the scattering particle unit 303 includes a first scattering particle unit 3031 and a second scattering particle unit 3032 arranged in sequence away from the touch detection layer 1, the thickness of the first scattering particle unit 3031 is 1 / 2h to 4 / 5h; the thickness of the second scattering particle unit 3032 is 1 / 5h to 1 / 2h; h is the total thickness of the scattering particle unit 303.

[0142] Specifically, as shown in Figures 16a and 16b, the scattering particle unit 303 includes a two-layer scattering particle structure. Optionally, the total film thickness h of the scattering particle unit 303 is 10μm to 15μm, wherein the film thickness of the second scattering particle unit 3032 close to the color filter layer 8 is h2, and the film thickness of the first scattering particle unit 3031 close to the auxiliary function layer below is h1. It is set that 1 / 2h≤h1≤4 / 5h, and 1 / 5h≤h2≤1 / 2h. This setting, on the one hand, can ensure that the first color light is evenly scattered in the direction from the substrate to the screen, increasing the proportion of the first color light that passes through the scattering particle unit 303 and is emitted upward to the screen, thereby increasing its light output brightness. On the other hand, in the direction from the light-emitting device layer to the touch detection layer 1, the proportion of the first color light that passes through the scattering particle unit 303 and is emitted downward to the touch detection layer 1 is further reduced, thereby reducing interference with the touch detection layer 1.

[0143] 17a-17b are schematic diagrams of another scattering particle unit provided in an embodiment of the present disclosure.

[0144] In some embodiments, the scattering particle unit 303 includes a first scattering particle unit 3031, a second scattering particle unit 3032, and a third scattering particle unit 3033, which are sequentially arranged along a direction away from the touch detection layer 1. The solid content of the scattering particles in the first scattering particle unit 3031 is 1% to 2%; the solid content of the scattering particles in the second scattering particle unit 3032 is 2% to 4%; and the solid content of the scattering particles in the third scattering particle unit 3033 is 4% to 6%.

[0145] In some embodiments, the scattering particle unit 303 includes a first scattering particle unit 3031, a second scattering particle unit 3032, and a third scattering particle unit 3033, which are sequentially arranged along a direction away from the touch detection layer 1. The thickness of the first scattering particle unit 3031 is 1 / 3h to 1 / 2h; the thickness of the second scattering particle unit 3032 is 1 / 6h to 1 / 3h; the thickness of the third scattering particle unit 3033 is 1 / 3h to 1 / 2h; and h is the total thickness of the scattering particle unit 303.

[0146] Specifically, as shown in Figures 17a-17b, the scattering particle unit 303 can also be configured as a three-layer structure. The solid content of the scattering particles in the film layer closest to the color filter layer 8 is higher than that of the scattering particles in the layer closer to the auxiliary functional layer below. This further reduces the proportion of the first color light that passes through the scattering particle unit 303 and reaches the touch detection layer 1, thereby reducing interference with the touch detection layer 1. Optionally, the total film thickness of the scattering particle unit 303 is set to h, which is generally set to 10μm to 15μm. The film thickness of the third scattering particle unit 3033 is h3, with 1 / 3h ≤ h3 ≤ 1 / 2h, and its solid content is 4% to 6%. The film thickness of the second scattering particle unit 3032 is h2, with 1 / 6h ≤ h2 ≤ 1 / 3h, and its solid content is 2% to 4%. The film thickness of the first scattering particle unit 3031 is h1, with 1 / 3h ≤ h1 ≤ 1 / 2h, and its solid content is 1% to 2%.

[0147] The scattering particle unit 303 may also include more or fewer structures. Other embodiments of the structure of the scattering particle unit 303 are not listed here one by one.

[0148] In some embodiments, the display substrate not only includes a base substrate 101, a light-emitting device layer, a quantum dot layer 3, a touch detection layer 1, an auxiliary function layer 4, an encapsulation layer 201, and a light blocking layer 5, but also includes an optical glue unit 304, and the first accommodating portion is used to accommodate the optical glue unit 304.

[0149] Specifically, Figure 18 is a schematic diagram of another display substrate provided by an embodiment of the present disclosure. As shown in Figure 18 , optical adhesive unit 304 is provided on the same layer as first quantum dot unit 301 and second quantum dot unit 302. This differs from the display substrate corresponding to Figure 3 in that a transparent optical adhesive unit 304 is provided in place of scattering particle unit 303 in Figure 3 , allowing the first color light to pass through optical adhesive unit 304 and be emitted upward.

[0150] In some embodiments, the display substrate not only includes a base substrate 101, a light-emitting device layer, a quantum dot layer 3, a touch detection layer 1, an auxiliary function layer 4, an encapsulation layer 201, a light blocking layer 5, and an optical adhesive unit 304, but also includes a color filter layer 8 located on the side of the quantum dot layer 3 away from the light-emitting device layer. The color filter layer 8 includes a black matrix 801 and a first structure 810, a second color filter 820 and a third color filter 830; the second color filter 820 is arranged in a one-to-one correspondence with the first quantum dot unit 301; the third color filter 830 is arranged in a one-to-one correspondence with the second quantum dot unit 302; the first structure 810 is arranged in a one-to-one correspondence with the optical adhesive unit 304; the first structure 810 is also configured to scatter the first color light.

[0151] Specifically, as shown in FIG18 , the difference between this embodiment and the display substrate corresponding to FIG3 lies in that a transparent optical adhesive unit 304 is provided in place of the scattering particle unit 303 in FIG3 , and the scattering particles are positioned in the position of the first color filter in FIG3 . This arrangement allows the first color light to be emitted upward through the optical adhesive unit 304. Furthermore, compared to the embodiment corresponding to FIG3 , the scattering particles are further away from the touch detection layer 1, reducing the proportion of the first color light emitted from the quantum dot layer that is directly scattered by the scattering particles into the touch detection layer 1, thereby reducing the proportion of the first color light that reaches the touch detection layer. Furthermore, the light directed from the base substrate toward the screen also has a certain scattering effect on the first color light.

[0152] In some embodiments, the material of the first structure 810 is a mixture of a first color filter material and a scattering particle material, and the solid content of the scattering particles is 6% to 8%.

[0153] Specifically, Figure 19 is a schematic diagram of a first structure provided by an embodiment of the present disclosure. As shown in Figure 19, the first structure 810 is composed of scattering particles 901 and a first color filter pattern 902. The scattering particles 901 are directly mixed into the photoresist of the first color filter pattern 902 and prepared through a coating and exposure process. In some embodiments, the thickness h of the film layer of the first structure 810 is set to 3μm to 5μm, and the solid content of the scattering particles is set to 6% to 8%. This configuration can meet the scattering requirements of the first color light.

[0154] In some embodiments, the first structure 810 includes a first color filter unit 8101 and a scattering particle unit 8102 which are sequentially arranged away from the quantum dot layer 3 .

[0155] In some embodiments, the thickness of the scattering particle unit 8102 is greater than or equal to the thickness of the first color filter unit 8101 .

[0156] Specifically, Figure 20 is a schematic diagram of another first structure provided by an embodiment of the present disclosure. As shown in Figure 20, for the first structure 810, the first color filter unit 8101 can be prepared first, and then the scattering particle unit 8102 can be prepared thereon. In some embodiments, the total thickness h of the film layer of the first structure is set to 4μm to 6μm, wherein the film thickness h1 of the first color filter unit 8101 should be greater than the thickness of the black matrix 801. The film thickness h1 of the first color filter unit 8101 is set to: 1 / 3h≤h1≤1 / 2h; the film thickness h2 of the scattering particle unit 8102 should be greater than or equal to the film thickness of the first color filter unit 8101, and is set to: 1 / 2h≤h2≤2 / 3h.

[0157] The display substrate provided by the embodiment of the present disclosure, on the one hand, is optimized for the downward emission of light from the first quantum dot unit 301 and the second quantum dot unit 302 (i.e., R / G QD), and an auxiliary functional layer 4 is used for optimization, so that the reflectivity of the auxiliary functional layer 4 for the second color light R and the third color light G is improved, and the reflectivity of the first color light B is reduced, thereby effectively reducing the light emitted from below and reaching the surface of the touch detection layer 1, thereby improving the accuracy and sensitivity of the touch detection layer 1 detection. At the same time, as the second color light R and the third color light G emitted from below are reflected, the light extraction from the front of the display substrate can be improved, thereby improving the efficiency of the display device. On the other hand, for the optimization of the downward emission of light from the scattering particle unit above the first color light B, the embodiment of the present disclosure sets different first openings, second openings, and third openings for different pixel unit arrangement structures, thereby effectively reducing the light emitted from below and reaching the surface of the touch detection layer 1, thereby improving the accuracy and sensitivity of the touch detection layer 1 detection. Thirdly, in order to optimize the light emitted downward from the scattering particle layer above the first color light B, the embodiment of the present disclosure can also adjust the structure and position of the scattering particle unit. By designing the film thickness of the scattering particle unit and setting the solid content, it is possible to reduce the light emitted from below and reach the surface of the touch detection layer 1, thereby improving the accuracy and sensitivity of the touch detection layer 1 detection.

[0158] Based on the same inventive concept, an embodiment of the present disclosure further provides a display substrate, which includes any display substrate in the above embodiments.

[0159] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A display substrate, comprising: substrate; a light-emitting device layer, disposed on the base substrate, the light-emitting device layer comprising a plurality of light-emitting devices, and the light-emitting devices are configured to emit light of a first color; a quantum dot layer disposed on a side of the light-emitting device layer facing away from the substrate, the quantum dot layer comprising at least a first quantum dot unit and a second quantum dot unit, the first quantum dot unit being configured to emit a second color light under the excitation of the first color light, and the second quantum dot unit being configured to emit a third color light under the excitation of the first color light; a touch detection layer, disposed on a side of the light-emitting device layer away from the quantum dot layer, and configured to determine touch information based on the light signal it receives; An auxiliary functional layer is provided between the quantum dot layer and the light-emitting device layer; wherein the auxiliary functional layer is configured to transmit the first color light and reflect the second color light and the third color light.

2. The display substrate according to claim 1, wherein: An encapsulation layer is provided on a side of the light-emitting device layer facing away from the base substrate, and the auxiliary function layer is provided between the encapsulation layer and the quantum dot layer.

3. The display substrate according to claim 1 or 2, wherein: The auxiliary functional layer includes multiple sub-functional layers stacked in sequence along a direction away from the base substrate, and in the direction in which the quantum dot layer points to the base substrate, the refractive index of the sub-functional layer located in the odd-numbered layer is a first refractive index, and the refractive index of the sub-functional layer located in the even-numbered layer is a second refractive index, and the first refractive index is greater than the second refractive index.

4. The display substrate according to claim 3, wherein: The first refractive index ranges from 1.85 to 1.95; the second refractive index ranges from 1.2 to 1.

4.

5. The display substrate according to claim 3, wherein: The thickness of the sub-functional layer located in the odd-numbered layers ranges from 0.5 μm to 2.0 μm; the thickness of the sub-functional layer located in the even-numbered layers ranges from 1.0 μm to 2.0 μm. The display substrate according to claim 1 , wherein: The display substrate includes a first sub-pixel, a second sub-pixel and a third sub-pixel that respectively emit first color light, second color light and third color light, wherein the first sub-pixel includes one of the light-emitting devices; the second sub-pixel includes one of the light-emitting devices and one of the first quantum dot units; and the third sub-pixel includes one of the light-emitting devices and one of the second quantum dot units.

7. The display substrate according to claim 6, wherein: The display substrate includes a light-blocking layer located on the side of the auxiliary functional layer away from the base substrate, the light-blocking layer includes a first accommodating portion for transmitting the first color light emitted by the light-emitting device in the first sub-pixel, a second accommodating portion for accommodating the first quantum dot unit, a third accommodating portion for accommodating the second quantum dot unit, and a first blocking portion defining the first accommodating portion, the second accommodating portion and the third accommodating portion; the first blocking portion has at least one first opening extending through the first accommodating portion along its thickness direction.

8. The display substrate according to claim 7, wherein: The display substrate is divided into a plurality of pixel units arranged in an array, each of the pixel units includes a first sub-pixel, a second sub-pixel and a third sub-pixel; an opening area is defined between any four pixel units arranged in an array, and the first opening is located in the opening area.

9. The display substrate according to claim 8, wherein: When the orthographic projections of the first accommodating portion, the second accommodating portion, and the third accommodating portion on the base substrate are all octagons, the orthographic projection of the opening area on the base substrate is a regular decagon, and the first opening is provided on at least one of the center of the regular decagon, the center of an edge, a vertex, a midpoint of a line connecting the vertex and the center, and a midpoint of a line connecting the center of an edge and the center.

10. The display substrate according to claim 9, wherein: The distance between the center of the regular decagon and any vertex of the regular decagon is 20 μm to 50 μm.

11. The display substrate according to claim 9, wherein: The area of ​​the regular decagon is 1 / 5S to S, where S is the area of ​​the orthographic projection of a single pixel unit on the substrate.

12. The display substrate according to claim 9, wherein: The orthographic projection area of ​​each of the first openings on the base substrate is 1 / 60S to 1 / 14S; For each of the first openings in one of the opening regions, a total area of ​​orthographic projections of the plurality of first openings on the base substrate is 1 / 8S to 1 / 2S.

13. The display substrate according to claim 8, wherein: When the orthographic projections of the first accommodating portion, the second accommodating portion, and the third accommodating portion on the base substrate are all rectangular, the orthographic projection of the opening area on the base substrate is a square, and the first opening is provided at least one of the six of the center, vertex, center of the side, midpoint of the line connecting the vertex and the center, midpoint of the line connecting the vertex and the center of the side, and midpoint of the line connecting the center and the center of the side of the square.

14. The display substrate according to claim 13, wherein: The side length of the square ranges from 40 μm to 120 μm.

15. The display substrate according to claim 13, wherein: The area of ​​the square is 1 / 4S to S, where S is the area of ​​a single pixel unit on the substrate.

16. The display substrate according to claim 13, wherein: The orthographic projection area of ​​each of the first openings on the base substrate is 1 / 100S to 1 / 20S; For each of the first openings in one of the opening regions, a total area of ​​orthographic projections of the plurality of first openings on the base substrate is 1 / 8S to 1 / 2S.

17. The display substrate according to any one of claims 7 to 16, wherein: The light emitting device layer includes a pixel defining layer, which is a light shielding layer and includes a fourth accommodating portion and a second blocking portion defining the fourth accommodating portion. The second blocking portion has a second opening, and the second opening is arranged in a one-to-one correspondence with the first opening.

18. The display substrate according to any one of claims 7 to 16, wherein: The display substrate also includes a color filter layer located on the side of the quantum dot layer away from the light-emitting device layer, the color filter layer includes a black matrix and a color filter; the black matrix includes a light-transmitting portion and a third blocking portion that defines the light-transmitting portion, the third blocking portion has a third opening, and the third opening is arranged in a one-to-one correspondence with the first opening.

19. The display substrate according to claim 7, wherein: The display substrate further includes a scattering particle unit. The first receiving portion is used to receive the scattering particle unit and is configured to scatter the first color light.

20. The display substrate according to claim 19, wherein The scattering particle unit includes a first scattering particle unit and a second scattering particle unit sequentially arranged away from the touch detection layer. The solid content of the scattering particles in the first scattering particle unit is 1% to 2%; the solid content of the scattering particles in the second scattering particle unit is 4% to 8%.

21. The display substrate according to claim 19, wherein The scattering particle unit includes a first scattering particle unit and a second scattering particle unit arranged in sequence away from the touch detection layer, the thickness of the first scattering particle unit is 1 / 2h to 4 / 5h; the thickness of the second scattering particle unit is 1 / 5h to 1 / 2h; h is the total thickness of the scattering particle unit.

22. The display substrate according to claim 19, wherein The scattering particle unit includes a first scattering particle unit, a second scattering particle unit, and a third scattering particle unit, which are arranged in sequence away from the touch detection layer. The solid content of the scattering particles in the first scattering particle unit is 1% to 2%; the solid content of the scattering particles in the second scattering particle unit is 2% to 4%; and the solid content of the scattering particles in the third scattering particle unit is 4% to 6%.

23. The display substrate according to claim 19, wherein The scattering particle unit includes a first scattering particle unit, a second scattering particle unit, and a third scattering particle unit, which are arranged in sequence away from the touch detection layer. The thickness of the first scattering particle unit is 1 / 3h to 1 / 2h; the thickness of the second scattering particle unit is 1 / 6h to 1 / 3h; the thickness of the third scattering particle unit is 1 / 3h to 1 / 2h; and h is the total thickness of the scattering particle units.

24. The display substrate according to claim 7, wherein: The display substrate further includes an optical adhesive unit, and the first receiving portion is used to receive the optical adhesive unit.

25. The display substrate according to claim 24, wherein: The optical fiber further includes a color filter layer located on a side of the quantum dot layer away from the light-emitting device layer, the color filter layer including a black matrix and a first structure, a second color filter, and a third color filter; the second color filter is arranged in a one-to-one correspondence with the first quantum dot unit; the third color filter is arranged in a one-to-one correspondence with the second quantum dot unit; and the first structure is arranged in a one-to-one correspondence with the optical adhesive unit. The first structure is further configured to scatter the first color light.

26. The display substrate according to claim 25, wherein: The material of the first structure is a mixture of a first color filter material and a scattering particle material, and the solid content of the scattering particles is 6% to 8%.

27. The display substrate according to claim 25, wherein: The first structure includes a first color filter unit and a scattering particle unit which are sequentially arranged away from the quantum dot layer.

28. The display substrate according to claim 27, wherein: The thickness of the scattering particle unit is greater than or equal to the thickness of the first color filter unit.

29. A display panel comprising the display substrate according to any one of claims 1 to 28.

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