Display panel and manufacturing method therefor, and display apparatus

Abstract

The present disclosure relates to the technical field of display, and provides a display panel and a manufacturing method therefor, and a display apparatus. The display panel comprises: a base substrate; a pixel circuit layer, a black pixel definition layer, an encapsulation layer, and a planarization layer that are located on one side of the base substrate and sequentially stacked in a direction moving away from the base substrate, wherein the black pixel definition layer has a plurality of first openings, the planarization layer has a plurality of second openings, and the plurality of first openings and the plurality of second openings are all arranged at intervals in a direction parallel to a bearing surface of the base substrate and in one-to-one correspondence; light-emitting elements located in the first openings; and filter units located in the second openings, wherein the color of a filter unit in each of the second openings is the same as the color of a light-emitting element in the corresponding first opening, the refractive index of the planarization layer is less than the refractive index of the filter unit, and filter units having different refractive indices are disposed at different distances from the corresponding light-emitting elements. The present disclosure can improve the light extraction efficiency of the display apparatus at a front viewing angle.

Description

Display panel, manufacturing method thereof and display device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411009657.4, filed on July 25, 2024, the contents of which are incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of display, and particularly refers to a display panel, a manufacturing method thereof and a display device. BACKGROUND

[0004] OLED (Organic Light-Emitting Diode) display devices have been listed as the next generation display technology with great development prospects due to their advantages of thinness, lightness, wide viewing angle, active light-emitting, continuous adjustable light-emitting color, low cost, fast response speed, small energy consumption, low driving voltage, wide operating temperature range, simple production process, high light-emitting efficiency and flexible display. SUMMARY

[0005] The technical problem to be solved by the present disclosure is to provide a display panel, a manufacturing method thereof and a display device, which can improve the light extraction efficiency of the display device at a normal viewing angle.

[0006] To solve the above technical problems, the technical solutions of the embodiments of the present disclosure are as follows:

[0007] In one aspect, a display panel is provided, comprising:

[0008] a substrate substrate;

[0009] a pixel circuit layer, a black pixel defining layer, an encapsulation layer and a planarization layer which are sequentially stacked in a direction away from the substrate substrate, the black pixel defining layer has a plurality of first openings, the planarization layer has a plurality of second openings, the plurality of first openings and the plurality of second openings are arranged in pairs in a direction parallel to the bearing surface of the substrate substrate;

[0010] a light-emitting element located in each of the first openings;

[0011] a light filtering unit located in each of the second openings, the color of the light filtering unit in each of the second openings is the same as the color of the light-emitting element in the corresponding first opening;

[0012] wherein the refractive index of the planarization layer is less than the refractive index of the light filtering unit, and the distance between the light filtering units with different refractive indices and the light-emitting elements is different.

[0013] In some embodiments, the light filtering unit comprises a first light filtering unit and a second light filtering unit with different colors, the refractive index of the first light filtering unit is greater than the refractive index of the second light filtering unit, and the distance between the first light filtering unit and the plane where the light emitting element is located is less than the distance between the second light filtering unit and the plane where the light emitting element is located.

[0014] In some embodiments, the light filtering unit further comprises a third light filtering unit, the refractive index of the third light filtering unit is the same as that of the second light filtering unit, and the distance between the third light filtering unit and the plane where the light emitting element is located is equal to the distance between the second light filtering unit and the plane where the light emitting element is located.

[0015] In some embodiments, the light filtering unit further comprises a third light filtering unit, the refractive index of the third light filtering unit is less than the refractive index of the second light filtering unit, and the distance between the third light filtering unit and the plane where the light emitting element is located is greater than the distance between the second light filtering unit and the plane where the light emitting element is located.

[0016] In some embodiments, the slope angle of the flat layer near the side surface of the second opening is 55-85°.

[0017] In some embodiments, the light filtering unit covers the entire area of the side surface of the flat layer near the second opening and extends along the side surface to cover part of the first surface of the flat layer away from the substrate.

[0018] In some embodiments, the width of the orthographic projection of the partial area on the substrate is 1-5 microns.

[0019] In some embodiments, the orthographic projection of the first opening on the substrate is located within the orthographic projection of the corresponding second opening on the substrate.

[0020] In some embodiments, the minimum distance between the orthographic projection of the boundary of the second opening on the substrate and the orthographic projection of the boundary of the corresponding first opening on the substrate is 0.5-2 microns.

[0021] In some embodiments, the flat layer comprises a plurality of flat film layers stacked in sequence in a direction away from the substrate.

[0022] Among the plurality of flat film layers, the refractive index of at least one flat film layer used to form the second opening is less than the refractive index of the light filtering unit.

[0023] In some embodiments, the refractive index of the flat film layer used to form the second opening is 1.45-1.5.

[0024] In some embodiments, the multi-layer flat film layer further comprises a first flat film layer between the first filter unit and the encapsulation layer, the first flat film layer is not provided with the second opening.

[0025] In some embodiments, the display panel further comprises:

[0026] A black matrix between adjacent filter units, a projection of the black matrix on the substrate substrate is located within a projection of the black pixel defining layer on the substrate substrate.

[0027] In some embodiments, the display panel further comprises:

[0028] A touch electrode between adjacent filter units, a projection of the touch electrode on the substrate substrate is located within a projection of the black matrix on the substrate substrate.

[0029] Embodiments of the present disclosure further provide a display device comprising the display panel as described above.

[0030] Embodiments of the present disclosure further provide a manufacturing method of a display panel, comprising:

[0031] Providing a substrate substrate;

[0032] Forming a pixel circuit layer, a black pixel defining layer, an encapsulation layer and a flat layer on the substrate substrate in sequence, the black pixel defining layer has a plurality of first openings, the flat layer has a plurality of second openings, the plurality of first openings and the plurality of second openings are arranged in a one-to-one correspondence.

[0033] Forming a light emitting element in the first opening;

[0034] Forming a filter unit in the second opening, the color of the filter unit in each second opening is the same as the color of the light emitting element in the corresponding first opening;

[0035] Wherein, the refractive index of the flat layer is less than the refractive index of the filter unit, the distance between the filter unit with different refractive index and the light emitting element is different.

[0036] Embodiments of the present disclosure have the following beneficial effects:

[0037] In the above scheme, the distance between the filter unit with different refractive index and the light emitting element is different, the filter unit with different refractive index and the flat layer cooperate with each other, and the efficiency of total reflection is different. In this way, by adjusting the distance between the filter unit and the flat layer, the total reflection efficiency of light of different colors can be adjusted, and the light output efficiency of the display device at the normal viewing angle can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] FIG. 1 is a structural schematic diagram of a display panel according to an embodiment of the present disclosure;

[0039] FIG. 2 is a schematic diagram of light rays emitted by a display panel according to an embodiment of the present disclosure;

[0040] FIG. 3 is a schematic diagram of light intensity corresponding to different exit angles;

[0041] FIGS. 4-10 are structural schematic diagrams of display panels according to some embodiments of the present disclosure.

[0042] FIG. 1 is a structural schematic diagram of a display panel according to an embodiment of the present disclosure; DETAILED DESCRIPTION

[0043] To make the technical problems, technical solutions and advantages of the embodiments of the present disclosure clearer, specific embodiments will be described in detail below with reference to the drawings.

[0044] For a display panel, the polarizer-Less (POL-Less) technology refers to a technology of replacing a traditional polarizer in the display panel with a color film or a color filter, which has the advantages of improving the light transmittance of the display panel, reducing the working power consumption of the display panel, and making the display panel thinner.

[0045] Currently, common POL-Less technologies include a technology of integrating a color filter (CF) in a color encapsulation layer (color on encapsulation, COE). A display panel using the COE technology can be referred to as a COE panel. The COE panel generally includes a substrate, and a pixel circuit layer, a pixel defining layer, an encapsulation layer and a black matrix layer which are sequentially stacked on one side of the substrate. The pixel defining layer is used to separate light emitting elements of different colors. The black matrix layer is used to separate CFs corresponding to the light emitting elements of different colors. The pixel circuit layer is used to drive the light emitting elements to emit light, and the light emitted by the light emitting elements can be filtered by the color CF and then emitted, so that the COE panel displays a color picture.

[0046] In order to further improve the light extraction efficiency of the display panel, a flat layer with a low refractive index and a color filter with a high refractive index are used to form a total reflection interface on the light extraction side of the display panel, so that the large-angle light emitted by the light emitting element is totally reflected at the total reflection interface, thereby improving the light extraction efficiency; however, the color filter includes filter units of different colors, and the refractive indices of the filter units of different colors are different, which may cause the light extraction efficiencies of the light of different colors to be different, and affect the uniformity of light extraction.

[0047] Embodiments of the present disclosure provide a display panel and a manufacturing method thereof, and a display device, which can improve the light extraction efficiency of the display device at a normal viewing angle.

[0048] Embodiments of the present disclosure provide a display panel, comprising:

[0049] a substrate substrate;

[0050] a pixel circuit layer, a black pixel defining layer, an encapsulation layer and a flat layer which are sequentially stacked on one side of the substrate substrate in a direction away from the substrate substrate, the black pixel defining layer has a plurality of first openings, the flat layer has a plurality of second openings, the plurality of first openings and the plurality of second openings are arranged in pairs in a direction parallel to the bearing surface of the substrate substrate, and correspond one by one;

[0051] a light emitting element located in each of the first openings;

[0052] a filter unit located in each of the second openings, the color of the filter unit in each of the second openings is the same as that of the light emitting element in the corresponding first opening;

[0053] wherein the refractive index of the flat layer is less than that of the filter unit, and the distances between the filter units with different refractive indices and the light emitting element are different.

[0054] In the present embodiment, the distances between the filter units with different refractive indices and the light emitting element are different, and the filter units with different refractive indices and the flat layer cooperate with each other, and the efficiency of total reflection is different. In this way, by adjusting the distance between the filter unit and the flat layer, the total reflection efficiency of light of different colors can be adjusted, the light extraction efficiency of the display device at a normal viewing angle can be improved, and the uniformity of light extraction of the display device can be improved.

[0055] In some embodiments, the light filtering unit comprises a first light filtering unit and a second light filtering unit with different colors, the refractive index of the first light filtering unit is greater than the refractive index of the second light filtering unit, so that the large-angle light emitted by the light emitting element is more likely to be totally reflected at the interface between the first light filtering unit and the flat layer. In order to balance the light emitting efficiency, the distance between the first light filtering unit and the plane where the light emitting element is located is set to be less than the distance between the second light filtering unit and the plane where the light emitting element is located, so that the probability of total reflection of the large-angle light emitted by the light emitting element at the interface between the second light filtering unit and the flat layer is improved, and the case that the light emitting efficiency is different due to the difference in refractive index between the first light filtering unit and the second light filtering unit is avoided. The above-mentioned distance is a vertical distance.

[0056] In some embodiments, the light filtering unit further comprises a third light filtering unit, the refractive index of the third light filtering unit is the same as that of the second light filtering unit, so that the probability of total reflection of the large-angle light emitted by the light emitting element at the interface between the second light filtering unit and the flat layer is the same as the probability of total reflection of the large-angle light emitted by the light emitting element at the interface between the third light filtering unit and the flat layer, and therefore, the distance between the third light filtering unit and the plane where the light emitting element is located can be equal to the distance between the second light filtering unit and the plane where the light emitting element is located. The above-mentioned distance is a vertical distance.

[0057] In some embodiments, the light filtering unit further comprises a third light filtering unit, the refractive index of the third light filtering unit is less than the refractive index of the second light filtering unit, so that the probability of total reflection of the large-angle light emitted by the light emitting element at the interface between the second light filtering unit and the flat layer is greater than the probability of total reflection of the large-angle light emitted by the light emitting element at the interface between the third light filtering unit and the flat layer. By setting the distance between the third light filtering unit and the plane where the light emitting element is located to be greater than the distance between the second light filtering unit and the plane where the light emitting element is located, the probability of total reflection of the large-angle light emitted by the light emitting element at the interface between the third light filtering unit and the flat layer is improved, and the case that the light emitting efficiency is different due to the difference in refractive index between the third light filtering unit and the second light filtering unit is avoided. The above-mentioned distance is a vertical distance.

[0058] In this embodiment, the colors of the first light filtering unit, the second light filtering unit and the third light filtering unit are different, and the first light filtering unit, the second light filtering unit and the third light filtering unit can be selected from a red light filtering unit, a green light filtering unit and a blue light filtering unit.

[0059] In the specific embodiment one, as shown in FIG. 1, the display panel includes a driving substrate 01, an anode 02 and a black pixel defining layer 04 located on the driving substrate 01, the driving substrate 01 includes a substrate and a pixel circuit layer located on the substrate, the black pixel defining layer 04 defines a plurality of first openings, a red light emitting layer 031, a green light emitting layer 032 and a blue light emitting layer 033 are formed in the first openings, the display panel further includes a cathode 05 and an encapsulation layer 06 located on a side of the light emitting layer away from the driving substrate. In a direction away from the driving substrate, the encapsulation layer 06 sequentially has a first planar film layer 07, a second planar film layer 08, a third planar film layer 09 and a fourth planar film layer 10, the first planar film layer 07 defines a plurality of second openings, a red filter unit 121 is formed in the second openings defined by the first planar film layer 07, the second openings defined by the first planar film layer 07 correspond one-to-one to the first openings in which the red light emitting layer 031 is formed; the second planar film layer 08 defines a plurality of second openings, a green filter unit 122 and a blue filter unit 123 are formed in the second openings defined by the second planar film layer 08, the second openings defined by the second planar film layer 08 correspond one-to-one to the first openings in which the green light emitting layer 032 and the blue light emitting layer 033 are formed.

[0060] In the embodiment, the refractive index of the first planar film layer 07 can be 1.45-1.5, the refractive index of the red filter unit 121 can be 1.65-1.75, for example, 1.7; the slope angle a of the side surface of the first planar film layer 07 close to the second opening can be 55-85°, so that the large viewing angle light emitted by the red light emitting layer 031 is easy to be totally reflected at the interface between the first planar film layer 07 and the red filter unit 121, so that more light can be emitted through the red filter unit 121, thereby improving the light emission efficiency of the display panel; in order to avoid the first planar film layer 07 blocking the emission of light, so that more light is emitted through the red filter unit 121, the orthographic projection of the first opening in which the red light emitting layer 031 is formed on the driving substrate 01 is located in the orthographic projection of the second opening defined by the first planar film layer 07 on the driving substrate 01. In order to make more light be emitted through the red filter unit 121 and improve the light emission efficiency of the display panel, the minimum distance d1 between the boundary of the second opening defined by the first planar film layer 07 and the orthographic projection of the boundary of the corresponding first opening on the substrate can be 0.5-2 microns.

[0061] In the embodiment, the thickness of the first planar film layer 07 can be 1.5-2.5 microns, and the thickness of the red filter unit 121 is not less than the thickness of the first planar film layer 07. In order to ensure the area of the interface between the red filter unit 121 and the first planar film layer 07, so that more light is totally reflected at the interface between the red filter unit 121 and the first planar film layer 07, the red filter unit 121 covers the entire area of the side surface of the first planar film layer 07 close to the second opening, and extends along the side surface to cover part of the first surface of the first planar film layer 07 away from the substrate substrate. In some embodiments, the width d2 of the orthographic projection of the part on the substrate substrate can be 1-5 microns.

[0062] The black matrix 11 is formed on the side of the third planar film layer 09 away from the driving substrate 01, and the orthographic projection of the black matrix 11 on the substrate substrate is located within the orthographic projection of the black pixel defining layer 04 on the substrate substrate. The touch electrode 13 can also be formed on the side of the first planar film layer 07 away from the driving substrate 01, so that the display panel integrates the touch function. In order not to affect the display, the orthographic projection of the touch electrode 13 on the substrate substrate is located within the orthographic projection of the black matrix 11 on the substrate substrate.

[0063] The refractive index of the second planar film layer 08 can be 1.45-1.5, and the refractive index of the green filter unit 122 and the blue filter unit 123 can be 1.55-1.65, such as 1.6. The slope angle of the side surface of the second planar film layer 08 close to the second opening can be 55-85°, so that the large-angle light emitted by the green light-emitting layer 032 is easily totally reflected at the interface between the second planar film layer 08 and the green filter unit 122, and the large-angle light emitted by the blue light-emitting layer 033 is easily totally reflected at the interface between the second planar film layer 08 and the blue filter unit 123, so that more light can be emitted through the green filter unit 122 and the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel. In order to avoid the second planar film layer 08 blocking the emission of light, so that more light is emitted through the green filter unit 122 and the blue filter unit 123, the orthographic projection of the first opening in which the green light-emitting layer 032 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01, and the orthographic projection of the first opening in which the blue filter unit 123 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01. In order to make more light emitted through the green filter unit 122 and the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel, the minimum distance between the orthographic projection of the boundary of the second opening defined by the second planar film layer 08 on the driving substrate 01 and the orthographic projection of the boundary of the corresponding first opening on the substrate substrate can be 0.5-2 microns.

[0064] In the embodiment, the thickness of the second planar film layer 08 can be 1.5-2.5 microns, and the thickness of the green filter unit 122 and the blue filter unit 123 is not less than the thickness of the second planar film layer 08. In order to ensure the area of the interface between the green filter unit 122 and the blue filter unit 123 and the second planar film layer 08, so that more light is totally reflected at the interface between the green filter unit 122 and the blue filter unit 123 and the second planar film layer 08, the green filter unit 122 and the blue filter unit 123 cover the entire area of the side surface of the second planar film layer 08 close to the second opening, and extend along the side surface to cover part of the first surface of the second planar film layer 08 away from the substrate substrate. In some embodiments, the width of the orthographic projection of the part on the substrate can be 1-5 microns.

[0065] The touch electrode bridge 14 can also be formed on the side of the second planar film layer 08 away from the driving substrate 01. In order not to affect the display, the orthographic projection of the touch electrode bridge 14 on the substrate substrate is located within the orthographic projection of the black matrix 11 on the substrate substrate.

[0066] In the embodiment, the third planar film layer 09 and the fourth planar film layer 10 can be prepared by using a resin with a refractive index of 1.45-1.5.

[0067] In the embodiment, the preparation sequence of each film layer when preparing the display panel is: the first planar film layer 07, the red filter unit 121, the touch electrode 13, the second planar film layer 08, the green filter unit 122, the blue filter unit 123, the touch electrode bridge 14, the third planar film layer 09, the black matrix 11 and the fourth planar film layer 10. In the embodiment, the third planar film layer 09 and the fourth planar film layer 10 do not form the second opening, so the refractive index of the third planar film layer 09 and the fourth planar film layer 10 is not limited.

[0068] As shown in FIG. 2, since the refractive index of the red filter unit 121 is greater than the refractive index of the green filter unit 122 and the blue filter unit 123, the light emitted by the red light-emitting layer is more likely to be totally reflected at the interface between the red filter unit 121 and the first flat film layer 07; in this embodiment, the distance between the red filter unit 121 and the red light-emitting layer is less than the distance between the green filter unit 122 and the blue filter unit 123 and the light-emitting layer, in the red pixel area, the light with an emission angle greater than θ1 will be totally reflected at the interface between the red filter unit 121 and the first flat film layer 07; in the green pixel area and the blue pixel area, the light with an emission angle greater than θ2 will be totally reflected at the interface between the filter unit and the second flat film layer 08, since the distance between the red filter unit 121 and the red light-emitting layer is less than the distance between the green filter unit 122 and the blue filter unit 123 and the light-emitting layer, θ1 is greater than θ2, which can increase the probability of total reflection of the light emitted by the green light-emitting layer and the blue light-emitting layer at the interface between the filter unit and the second flat film layer 08, and as shown in FIG. 3, the light intensity proportion corresponding to the viewing angle θ2 is greater than the light intensity proportion corresponding to the viewing angle θ1, which increases the light extraction efficiency of the green pixel area and the blue pixel area, which can avoid the case that the light extraction efficiency is different due to the difference in refractive index between the red filter unit 121 and the green filter unit 122 and the blue filter unit 123, and improve the uniformity of light emission of the display device.

[0069] In a specific embodiment two, as shown in FIG. 4, the display panel includes a driving substrate 01, an anode 02 and a black pixel defining layer 04 located on the driving substrate 01, the driving substrate 01 includes a substrate and a pixel circuit layer located on the substrate, the black pixel defining layer 04 defines a plurality of first openings, and a red light-emitting layer 031, a green light-emitting layer 032 and a blue light-emitting layer 033 are formed in the first openings, the display panel further includes a cathode 05 and an encapsulation layer 06 located away from the driving substrate side of the light-emitting layer. In the direction away from the driving substrate, the first flat film layer 07, the second flat film layer 08, the third flat film layer 09 and the fourth flat film layer 10 are sequentially formed on the encapsulation layer 06, the second flat film layer 08 defines a plurality of second openings, the red filter unit 121 is formed in the second openings defined by the second flat film layer 08, and the second openings defined by the second flat film layer 08 correspond one by one to the first openings in which the red light-emitting layer 031 is formed; the third flat film layer 09 defines a plurality of second openings, the green filter unit 122 and the blue filter unit 123 are formed in the second openings defined by the third flat film layer 09, and the second openings defined by the third flat film layer 09 correspond one by one to the first openings in which the green light-emitting layer 032 and the blue light-emitting layer 033 are formed.

[0070] In the embodiment, the refractive index of the second planar film layer 08 can be 1.45-1.5, the refractive index of the red filter unit 121 can be 1.65-1.75, for example, 1.7; the slope angle of the side surface of the second planar film layer 08 close to the second opening can be 55-85°, so that the large visual angle light emitted by the red light-emitting layer 031 is prone to total reflection at the interface between the second planar film layer 08 and the red filter unit 121, thereby enabling more light to be emitted through the red filter unit 121, and improving the light-emitting efficiency of the display panel; in order to avoid the second planar film layer 08 blocking the emission of light, so that more light is emitted through the red filter unit 121, the orthographic projection of the first opening in which the red light-emitting layer 031 is formed on the driving substrate 01 is located within the orthographic projection of the second opening defined by the second planar film layer 08 on the driving substrate 01. In order to enable more light to be emitted through the red filter unit 121 and improve the light-emitting efficiency of the display panel, the minimum distance between the orthographic projection of the boundary of the second opening defined by the second planar film layer 08 on the driving substrate 01 and the orthographic projection of the boundary of the corresponding first opening on the substrate can be 0.5-2 microns.

[0071] In the embodiment, the thickness of the second planar film layer 08 can be 1.5-2.5 microns, and the thickness of the red filter unit 121 is not less than the thickness of the second planar film layer 08. In order to ensure the area of the interface between the red filter unit 121 and the second planar film layer 08, so that more light is totally reflected at the interface between the red filter unit 121 and the second planar film layer 08, the red filter unit 121 covers the entire area of the side surface of the second planar film layer 08 close to the second opening, and extends along the side surface to cover part of the area of the first surface of the second planar film layer 08 away from the substrate. In some embodiments, the width of the orthographic projection of the part of the area on the substrate can be 1-5 microns.

[0072] The black matrix 11 is formed on the side of the third planar film layer 09 away from the driving substrate 01, and the orthographic projection of the black matrix 11 on the substrate is located within the orthographic projection of the black pixel defining layer 04 on the substrate; the touch electrode 13 can also be formed on the side of the first planar film layer 07 away from the driving substrate 01, so that the display panel can realize the function of integrated touch control. In order not to affect display, the orthographic projection of the touch electrode 13 on the substrate is located within the orthographic projection of the black matrix 11 on the substrate.

[0073] The third flat film layer 09 can have a refractive index of 1.45-1.5, and the green filter unit 122 and the blue filter unit 123 can have a refractive index of 1.55-1.65, for example, 1.6. The slope angle of the side surface of the third flat film layer 09 close to the second opening can be 55-85°, so that the large-angle light emitted by the green light-emitting layer 032 is prone to total reflection at the interface between the third flat film layer 09 and the green filter unit 122, and the large-angle light emitted by the blue light-emitting layer 033 is prone to total reflection at the interface between the third flat film layer 09 and the blue filter unit 123, so that more light can be emitted through the green filter unit 122 and the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel. In order to avoid the third flat film layer 09 blocking the emission of light, so that more light is emitted through the green filter unit 122 and the blue filter unit 123, the orthographic projection of the first opening in which the green light-emitting layer 032 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01, and the orthographic projection of the first opening in which the blue filter unit 123 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01. In order to make more light emitted through the green filter unit 122 and the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel, the minimum distance between the orthographic projection of the boundary of the second opening defined by the third flat film layer 09 on the driving substrate 01 and the orthographic projection of the boundary of the corresponding first opening on the substrate can be 0.5-2 microns.

[0074] In this embodiment, the thickness of the third flat film layer 09 can be 1.5-2.5 microns, and the thickness of the green filter unit 122 and the blue filter unit 123 is not less than the thickness of the third flat film layer 09. In order to ensure the area of the interface between the green filter unit 122 and the blue filter unit 123 and the third flat film layer 09, so that more light is totally reflected at the interface between the green filter unit 122 and the blue filter unit 123 and the third flat film layer 09, the green filter unit 122 and the blue filter unit 123 cover the entire area of the side surface of the third flat film layer 09 close to the second opening, and extend along the side surface to cover part of the first surface of the third flat film layer 09 away from the substrate. In some embodiments, the orthographic projection of the part of the substrate can have a width of 1-5 microns.

[0075] The touch electrode bridge 14 can also be formed on the side of the second flat film layer 08 away from the driving substrate 01. In order not to affect the display, the orthographic projection of the touch electrode bridge 14 on the substrate is located within the orthographic projection of the black matrix 11 on the substrate.

[0076] In this embodiment, the first flat film layer 07 and the fourth flat film layer 10 can be made of resin with a refractive index of 1.45-1.5.

[0077] In this embodiment, the preparation sequence of each film layer is: the first flat film layer 07, the touch electrode 13, the second flat film layer 08, the red filter unit 121, the touch electrode bridge 14, the third flat film layer 09, the green filter unit 122, the blue filter unit 123, the black matrix 11 and the fourth flat film layer 10. In this embodiment, the first flat film layer 07 and the fourth flat film layer 10 do not form the second opening, and thus the refractive index of the first flat film layer 07 and the fourth flat film layer 10 is not limited.

[0078] In this embodiment, the distance between the red filter unit 121 and the red light-emitting layer is less than the distance between the green filter unit 122 and the blue filter unit 123 and the light-emitting layer. In the red pixel region, the light with the exit angle greater than θ1 will be totally reflected at the interface between the red filter unit 121 and the first flat film layer 07; in the green pixel region and the blue pixel region, the light with the exit angle greater than θ2 will be totally reflected at the interface between the filter unit and the second flat film layer 08. Since the distance between the red filter unit 121 and the red light-emitting layer is less than the distance between the green filter unit 122 and the blue filter unit 123 and the light-emitting layer, θ1 is greater than θ2, which can increase the probability of total reflection of the light emitted by the green light-emitting layer and the blue light-emitting layer at the interface between the filter unit and the second flat film layer 08. As shown in FIG. 2, the light intensity proportion corresponding to the viewing angle θ2 is greater than the light intensity proportion corresponding to the viewing angle θ1, which increases the light extraction efficiency of the green pixel region and the blue pixel region. Thus, the difference in light extraction efficiency caused by the difference in refractive index between the red filter unit 121, the green filter unit 122 and the blue filter unit 123 can be avoided, and the uniformity of light extraction of the display device is improved.

[0079] In the third embodiment, as shown in FIG. 5, the display panel includes a driving substrate 01, an anode 02 and a black pixel defining layer 04 on the driving substrate 01, the driving substrate 01 includes a substrate and a pixel circuit layer on the substrate, the black pixel defining layer 04 defines a plurality of first openings, a red light-emitting layer 031, a green light-emitting layer 032 and a blue light-emitting layer 033 are formed in the first openings, the display panel further includes a cathode 05 and an encapsulation layer 06 on a side of the light-emitting layer away from the driving substrate. In a direction away from the driving substrate, the encapsulation layer 06 sequentially has a first planarization film layer 07, a second planarization film layer 08, a third planarization film layer 09 and a fourth planarization film layer 10, the first planarization film layer 07 defines a plurality of second openings, a red filter unit 121 is formed in the second openings defined by the first planarization film layer 07, and the second openings defined by the first planarization film layer 07 correspond one-to-one to the first openings in which the red light-emitting layer 031 is formed; the third planarization film layer 09 defines a plurality of second openings, a green filter unit 122 and a blue filter unit 123 are formed in the second openings defined by the third planarization film layer 09, and the second openings defined by the third planarization film layer 09 correspond one-to-one to the first openings in which the green light-emitting layer 032 and the blue light-emitting layer 033 are formed.

[0080] In the embodiment, the first planarization film layer 07 can have a refractive index of 1.45-1.5, and the red filter unit 121 can have a refractive index of 1.65-1.75, for example, 1.7; a slope angle of a side surface of the first planarization film layer 07 close to the second opening can be 55-85°, so that the large-angle light emitted by the red light-emitting layer 031 is prone to total reflection at the interface between the first planarization film layer 07 and the red filter unit 121, thereby enabling more light to be emitted through the red filter unit 121 and improving the light-emitting efficiency of the display panel; in order to avoid the first planarization film layer 07 blocking the emission of light and enable more light to be emitted through the red filter unit 121, the orthographic projection of the first opening in which the red light-emitting layer 031 is formed on the driving substrate 01 is located in the orthographic projection of the second opening defined by the first planarization film layer 07 on the driving substrate 01. In order to enable more light to be emitted through the red filter unit 121 and improve the light-emitting efficiency of the display panel, the minimum distance between the boundary of the second opening defined by the first planarization film layer 07 and the orthographic projection of the boundary of the corresponding first opening on the substrate can be 0.5-2 microns.

[0081] In the embodiment, the thickness of the first planar film layer 07 can be 1.5-2.5 microns, and the thickness of the red filter unit 121 is not less than the thickness of the first planar film layer 07. In order to ensure the area of the interface between the red filter unit 121 and the first planar film layer 07, so that more light is totally reflected at the interface between the red filter unit 121 and the first planar film layer 07, the red filter unit 121 covers the entire area of the side surface of the first planar film layer 07 close to the second opening, and extends along the side surface to cover part of the first surface of the first planar film layer 07 away from the substrate substrate. In some embodiments, the width of the orthographic projection of the part on the substrate can be 1-5 microns.

[0082] The black matrix 11 is formed on the side of the third planar film layer 09 away from the driving substrate 01, and the orthographic projection of the black matrix 11 on the substrate substrate is located within the orthographic projection of the black pixel defining layer 04 on the substrate substrate. The touch electrode 13 can also be formed on the side of the first planar film layer 07 away from the driving substrate 01, so that the display panel integrates the touch function. In order not to affect the display, the orthographic projection of the touch electrode 13 on the substrate substrate is located within the orthographic projection of the black matrix 11 on the substrate substrate.

[0083] The refractive index of the third planar film layer 09 can be 1.45-1.5, and the refractive index of the green filter unit 122 and the blue filter unit 123 can be 1.55-1.65, such as 1.6. The slope angle of the side surface of the third planar film layer 09 close to the second opening can be 55-85°, so that the large viewing angle light emitted by the green light-emitting layer 032 is easily totally reflected at the interface between the third planar film layer 09 and the green filter unit 122, and the large viewing angle light emitted by the blue light-emitting layer 033 is easily totally reflected at the interface between the third planar film layer 09 and the blue filter unit 123, so that more light can be emitted through the green filter unit 122 and the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel. In order to avoid the third planar film layer 09 blocking the emission of light, so that more light is emitted through the green filter unit 122 and the blue filter unit 123, the orthographic projection of the first opening in which the green light-emitting layer 032 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01, and the orthographic projection of the first opening in which the blue filter unit 123 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01. In order to make more light emitted through the green filter unit 122 and the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel, the minimum distance between the orthographic projection of the boundary of the second opening defined by the third planar film layer 09 on the driving substrate 01 and the orthographic projection of the boundary of the corresponding first opening on the substrate substrate can be 0.5-2 microns.

[0084] In this embodiment, the third planar film layer 09 can have a thickness of 1.5-2.5 microns, and the thickness of the green filter unit 122 and the blue filter unit 123 is not less than the thickness of the third planar film layer 09. In order to ensure the area of the interface between the green filter unit 122 and the blue filter unit 123 and the third planar film layer 09, so that more light is totally reflected at the interface between the green filter unit 122 and the blue filter unit 123 and the third planar film layer 09, the green filter unit 122 and the blue filter unit 123 cover the entire area of the side surface of the third planar film layer 09 close to the second opening, and extend along the side surface to cover part of the first surface of the third planar film layer 09 away from the substrate substrate. In some embodiments, the width of the orthographic projection of the part on the substrate can be 1-5 microns.

[0085] The touch electrode bridge 14 can also be formed on the side of the second planar film layer 08 away from the driving substrate 01. In order to not affect the display, the orthographic projection of the touch electrode bridge 14 on the substrate substrate is located within the orthographic projection of the black matrix 11 on the substrate substrate.

[0086] In this embodiment, the second planar film layer 08 and the fourth planar film layer 10 can be prepared by using a resin with a refractive index of 1.45-1.5.

[0087] In this embodiment, when preparing the display panel, the preparation sequence of each film layer is: the first planar film layer 07, the red filter unit 121, the touch electrode 13, the second planar film layer 08, the touch electrode bridge 14, the third planar film layer 09, the green filter unit 122, the blue filter unit 123, the black matrix 11 and the fourth planar film layer 10. In this embodiment, the second planar film layer 08 and the fourth planar film layer 10 do not form a second opening, so the refractive index of the second planar film layer 08 and the fourth planar film layer 10 is not limited.

[0088] In the embodiment, the distance between the red filter unit 121 and the red light-emitting layer is less than the distance between the green filter unit 122 and the blue filter unit 123 and the light-emitting layer. In the red pixel region, the light with the exit angle greater than θ1 will be totally reflected at the interface between the red filter unit 121 and the first planar film layer 07. In the green pixel region and the blue pixel region, the light with the exit angle greater than θ2 will be totally reflected at the interface between the filter unit and the second planar film layer 08. Since the distance between the red filter unit 121 and the red light-emitting layer is less than the distance between the green filter unit 122 and the blue filter unit 123 and the light-emitting layer, θ1 is greater than θ2. In this way, the probability of the light emitted by the green light-emitting layer and the blue light-emitting layer being totally reflected at the interface between the filter unit and the second planar film layer 08 is increased. As shown in FIG. 2, the light intensity proportion corresponding to the viewing angle θ2 is greater than the light intensity proportion corresponding to the viewing angle θ1. In this way, the light emission efficiency of the green pixel region and the blue pixel region is increased. In this way, the case that the light emission efficiency is different due to the difference in the refractive index between the red filter unit 121 and the green filter unit 122 and the blue filter unit 123 is avoided, and the uniformity of the light emission of the display device is improved.

[0089] In a specific embodiment four, as shown in FIG. 6, the display panel includes a driving substrate 01, an anode 02 and a black pixel defining layer 04 located on the driving substrate 01, the driving substrate 01 includes a substrate and a pixel circuit layer located on the substrate, the black pixel defining layer 04 defines a plurality of first openings, and a red light-emitting layer 031, a green light-emitting layer 032 and a blue light-emitting layer 033 are formed in the first openings. The display panel further includes a cathode 05 and an encapsulation layer 06 located on the side of the light-emitting layer away from the driving substrate. In the direction away from the driving substrate, the encapsulation layer 06 is sequentially provided with a first planar film layer 07, a second planar film layer 08, a third planar film layer 09 and a fourth planar film layer 10. The first planar film layer 07 defines a plurality of second openings, and a red filter unit 121 is formed in the second openings defined by the first planar film layer 07. The second openings defined by the first planar film layer 07 correspond one-to-one to the first openings in which the red light-emitting layer 031 is formed. The second planar film layer 08 defines a plurality of second openings, and a green filter unit 122 is formed in the second openings defined by the second planar film layer 08. The second openings defined by the second planar film layer 08 correspond one-to-one to the first openings in which the green light-emitting layer 032 is formed. The third planar film layer 09 defines a plurality of second openings, and a blue filter unit 123 is formed in the second openings defined by the third planar film layer 09. The second openings defined by the third planar film layer 09 correspond one-to-one to the first openings in which the blue light-emitting layer 033 is formed.

[0090] In the embodiment, the first planar film layer 07 can have a refractive index of 1.45-1.5, and the red filter unit 121 can have a refractive index of 1.65-1.75, for example, 1.7. The slope angle of the side surface of the first planar film layer 07 close to the second opening can be 55-85°, so that the large-angle light emitted by the red light-emitting layer 031 is likely to be totally reflected at the interface between the first planar film layer 07 and the red filter unit 121, thereby enabling more light to be emitted through the red filter unit 121 and improving the light-emitting efficiency of the display panel. In order to avoid the first planar film layer 07 blocking the emission of light and enable more light to be emitted through the red filter unit 121, the orthographic projection of the first opening in which the red light-emitting layer 031 is formed on the driving substrate 01 is located within the orthographic projection of the second opening defined by the first planar film layer 07 on the driving substrate 01. In order to enable more light to be emitted through the red filter unit 121 and improve the light-emitting efficiency of the display panel, the minimum distance between the orthographic projection of the boundary of the second opening defined by the first planar film layer 07 on the driving substrate 01 and the orthographic projection of the boundary of the corresponding first opening on the substrate can be 0.5-2 microns.

[0091] In the embodiment, the first planar film layer 07 can have a thickness of 1.5-2.5 microns, and the red filter unit 121 can have a thickness not less than that of the first planar film layer 07. In order to ensure the area of the interface between the red filter unit 121 and the first planar film layer 07 and enable more light to be totally reflected at the interface between the red filter unit 121 and the first planar film layer 07, the red filter unit 121 covers the entire area of the side surface of the first planar film layer 07 close to the second opening and extends along the side surface to cover part of the first surface of the first planar film layer 07 away from the substrate. In some embodiments, the orthographic projection of the part of the area on the substrate can have a width of 1-5 microns.

[0092] The black matrix 11 is formed on the side of the third planar film layer 09 away from the driving substrate 01, and the orthographic projection of the black matrix 11 on the substrate is located within the orthographic projection of the black pixel defining layer 04 on the substrate. The touch electrode 13 can also be formed on the side of the first planar film layer 07 away from the driving substrate 01, so that the display panel can integrate the touch function. In order not to affect the display, the orthographic projection of the touch electrode 13 on the substrate is located within the orthographic projection of the black matrix 11 on the substrate.

[0093] The refractive index of the second planar film layer 08 can be 1.45-1.5, and the refractive index of the green filter unit 122 can be 1.55-1.65, for example, 1.6; the slope angle of the side surface of the second planar film layer 08 close to the second opening can be 55-85°, so that the large-angle light emitted by the green light-emitting layer 032 is easily totally reflected at the interface between the second planar film layer 08 and the green filter unit 122, thereby enabling more light to be emitted through the green filter unit 122, improving the light-emitting efficiency of the display panel; in order to avoid the second planar film layer 08 blocking the emission of light, so that more light is emitted through the green filter unit 122, the orthographic projection of the first opening in which the green light-emitting layer 032 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01. In order to enable more light to be emitted through the green filter unit 122 and improve the light-emitting efficiency of the display panel, the minimum distance between the boundary of the second opening defined by the second planar film layer 08 and the orthographic projection of the boundary of the corresponding first opening on the substrate substrate can be 0.5-2 microns.

[0094] In the embodiment, the thickness of the second planar film layer 08 can be 1.5-2.5 microns, and the thickness of the green filter unit 122 is not less than the thickness of the second planar film layer 08. In order to ensure the area of the interface between the green filter unit 122 and the second planar film layer 08, so that more light is totally reflected at the interface between the green filter unit 122 and the second planar film layer 08, the green filter unit 122 covers the entire area of the side surface of the second planar film layer 08 close to the second opening, and extends along the side surface to cover part of the area of the first surface of the second planar film layer 08 away from the substrate substrate. In some embodiments, the width of the orthographic projection of the part of the area on the substrate substrate can be 1-5 microns.

[0095] The touch electrode bridge 14 can also be formed on the side of the second planar film layer 08 away from the driving substrate 01. In order not to affect the display, the orthographic projection of the touch electrode bridge 14 on the substrate substrate is located within the orthographic projection of the black matrix 11 on the substrate substrate.

[0096] The refractive index of the third planar film layer 09 can be 1.45-1.5, and the refractive index of the blue filter unit 123 can be 1.5-1.55, for example, 1.55; the slope angle of the third planar film layer 09 close to the side surface of the second opening can be 55-85°, so that the large visual angle light emitted by the blue light-emitting layer 033 is prone to total reflection at the interface between the third planar film layer 09 and the blue filter unit 123, thereby enabling more light to be emitted through the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel; in order to avoid the third planar film layer 09 blocking the emission of light, so that more light is emitted through the blue filter unit 123, the first opening formed with the blue filter unit 123 is located in the orthographic projection of the corresponding second opening on the driving substrate 01. In order to enable more light to be emitted through the blue filter unit 123 and improve the light-emitting efficiency of the display panel, the minimum distance between the boundary of the second opening defined by the third planar film layer 09 and the orthographic projection of the boundary of the first opening on the substrate on the driving substrate 01 can be 0.5-2 microns.

[0097] In this embodiment, the thickness of the third planar film layer 09 can be 1.5-2.5 microns, and the thickness of the blue filter unit 123 is not less than the thickness of the third planar film layer 09. In order to ensure the area of the interface between the blue filter unit 123 and the third planar film layer 09, so that more light is totally reflected at the interface between the blue filter unit 123 and the third planar film layer 09, the blue filter unit 123 covers the entire area of the side surface of the third planar film layer 09 close to the second opening, and extends along the side surface to cover part of the first surface of the third planar film layer 09 away from the substrate, and in some embodiments, the orthographic projection of the part of the area on the substrate can have a width of 1-5 microns.

[0098] In this embodiment, the fourth planar film layer 10 can be prepared by using a resin with a refractive index of 1.45-1.5.

[0099] In this embodiment, the preparation sequence of each film layer when preparing the display panel is: the first planar film layer 07, the red filter unit 121, the touch electrode 13, the second planar film layer 08, the green filter unit 122, the touch electrode bridge 14, the third planar film layer 09, the blue filter unit 123, the black matrix 11, and the fourth planar film layer 10. In this embodiment, the fourth planar film layer 10 does not form a second opening, so the refractive index of the fourth planar film layer 10 is not limited.

[0100] In this embodiment, the refractive index of the red filter unit 121 is greater than the refractive index of the green filter unit 122, the refractive index of the green filter unit 122 is greater than the refractive index of the blue filter unit 123, and the distance between the red filter unit 121 and the red light-emitting layer is less than the distance between the green filter unit 122 and the green light-emitting layer, and the distance between the green filter unit 122 and the green light-emitting layer is less than the distance between the blue filter unit 123 and the blue light-emitting layer. This can increase the probability of total reflection of light emitted by the green light-emitting layer and the blue light-emitting layer at the interface between the filter unit and the flat film layer, thereby increasing the light-emitting efficiency of the green pixel region and the blue pixel region. This can avoid the case where the light-emitting efficiency is different due to the difference in refractive index between the red filter unit 121 and the green filter unit 122 and the blue filter unit 123, and improve the uniformity of light emitted by the display device.

[0101] In a specific embodiment five, as shown in FIG. 7, the display panel includes a driving substrate 01, an anode 02 and a black pixel defining layer 04 located on the driving substrate 01, the driving substrate 01 including a substrate and a pixel circuit layer located on the substrate, and the black pixel defining layer 04 defining a plurality of first openings, a red light-emitting layer 031, a green light-emitting layer 032 and a blue light-emitting layer 033 being formed in the first openings. The display panel further includes a cathode 05 and an encapsulation layer 06 located on a side of the light-emitting layer away from the driving substrate. In a direction away from the driving substrate, the encapsulation layer 06 sequentially has a first flat film layer 07, a second flat film layer 08, a third flat film layer 09 and a fourth flat film layer 10, the first flat film layer 07 defining a plurality of second openings, the green filter unit 122 and the blue filter unit 123 being formed in the second openings defined by the first flat film layer 07, and the second openings defined by the first flat film layer 07 corresponding one-to-one to the first openings in which the green light-emitting layer 032 and the blue light-emitting layer 033 are formed; the second flat film layer 08 defining a plurality of second openings, the red filter unit 121 being formed in the second openings defined by the second flat film layer 08, and the second openings defined by the second flat film layer 08 corresponding one-to-one to the first opening in which the red light-emitting layer 031 is formed.

[0102] In the embodiment, the first flat film layer 07 can have a refractive index of 1.45-1.5, the green filter unit 122 and the blue filter unit 123 can have a refractive index of 1.65-1.75, for example, 1.7; the slope angle of the side surface of the first flat film layer 07 close to the second opening can be 55-85°, so that the large visual angle light emitted by the green light-emitting layer 032 and the blue light-emitting layer 033 is prone to total reflection at the interface between the first flat film layer 07 and the green filter unit 122 and the blue filter unit 123, so that more light can be emitted through the green filter unit 122 and the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel; in order to avoid the first flat film layer 07 blocking the emission of light, so that more light is emitted through the green filter unit 122 and the blue filter unit 123, the orthographic projection of the first opening in which the green light-emitting layer 032 and the blue light-emitting layer 033 are formed on the driving substrate 01 is located in the orthographic projection of the second opening defined by the first flat film layer 07 on the driving substrate 01. In order to make more light be emitted through the green filter unit 122 and the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel, the minimum distance between the orthographic projection of the boundary of the second opening defined by the first flat film layer 07 on the driving substrate 01 and the orthographic projection of the boundary of the corresponding first opening on the substrate can be 0.5-2 microns.

[0103] In the embodiment, the thickness of the first flat film layer 07 can be 1.5-2.5 microns, and the thickness of the green filter unit 122 and the blue filter unit 123 is not less than the thickness of the first flat film layer 07. In order to ensure the area of the interface between the green filter unit 122 and the blue filter unit 123 and the first flat film layer 07, so that more light is totally reflected at the interface between the green filter unit 122 and the blue filter unit 123 and the first flat film layer 07, the green filter unit 122 and the blue filter unit 123 cover the entire area of the side surface of the first flat film layer 07 close to the second opening, and extend along the side surface to cover part of the first surface of the first flat film layer 07 away from the substrate, and in some embodiments, the width of the orthographic projection of the part of the area on the substrate can be 1-5 microns.

[0104] The black matrix 11 is formed on the side of the third flat film layer 09 away from the driving substrate 01, and the orthographic projection of the black matrix 11 on the substrate is located in the orthographic projection of the black pixel defining layer 04 on the substrate; the touch electrode 13 can also be formed on the side of the first flat film layer 07 away from the driving substrate 01, so that the display panel can realize the function of integrated touch control, and in order not to affect the display, the orthographic projection of the touch electrode 13 on the substrate is located in the orthographic projection of the black matrix 11 on the substrate.

[0105] The refractive index of the second planar film layer 08 can be 1.45-1.5, and the refractive index of the red filter unit 121 can be 1.55-1.65, for example, 1.6; the slope angle of the side surface of the second planar film layer 08 close to the second opening can be 55-85°, so that the large-angle light emitted by the red light-emitting layer 031 is prone to total reflection at the interface between the second planar film layer 08 and the red filter unit 121, thereby enabling more light to be emitted through the red filter unit 121, and improving the light-emitting efficiency of the display panel; in order to avoid the second planar film layer 08 blocking the emission of light, so that more light is emitted through the red filter unit 121, the orthographic projection of the first opening in which the red light-emitting layer 031 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01. In order to enable more light to be emitted through the red filter unit 121 and improve the light-emitting efficiency of the display panel, the minimum distance between the boundary of the second opening defined by the second planar film layer 08 and the orthographic projection of the boundary of the first opening on the substrate on the substrate can be 0.5-2 microns.

[0106] In this embodiment, the thickness of the second planar film layer 08 can be 1.5-2.5 microns, and the thickness of the red filter unit 121 is not less than the thickness of the second planar film layer 08. In order to ensure the area of the interface between the red filter unit 121 and the second planar film layer 08, so that more light is totally reflected at the interface between the red filter unit 121 and the second planar film layer 08, the red filter unit 121 covers the entire area of the side surface of the second planar film layer 08 close to the second opening, and extends along the side surface to cover part of the first surface of the second planar film layer 08 away from the substrate. In some embodiments, the orthographic projection of the part of the area on the substrate can have a width of 1-5 microns.

[0107] The touch electrode bridge 14 can also be formed on the side of the second planar film layer 08 away from the driving substrate 01. In order not to affect display, the orthographic projection of the touch electrode bridge 14 on the substrate is located within the orthographic projection of the black matrix 11 on the substrate.

[0108] In this embodiment, the preparation sequence of each film layer when preparing the display panel is: the first planar film layer 07, the green filter unit 122, the blue filter unit 123, the touch electrode 13, the second planar film layer 08, the red filter unit 121, the touch electrode bridge 14, the third planar film layer 09, the black matrix 11, and the fourth planar film layer 10. In this embodiment, the third planar film layer 09 and the fourth planar film layer 10 do not form a second opening, so the refractive index of the third planar film layer 09 and the fourth planar film layer 10 is not limited.

[0109] In the embodiment, the red filter unit 121 has a smaller refractive index than the green filter unit 122 and the blue filter unit 123, and the distance between the red filter unit 121 and the red light-emitting layer is greater than the distance between the green filter unit 122 and the blue filter unit 123 and the light-emitting layer. This can increase the probability of total reflection of the light emitted by the red light-emitting layer at the interface between the filter unit and the second planar film layer 08, thereby increasing the light-emitting efficiency of the red pixel region. This can avoid the case that the light-emitting efficiency is different due to the difference in refractive index between the red filter unit 121 and the green filter unit 122 and the blue filter unit 123, and improve the uniformity of light emission of the display device.

[0110] In a specific embodiment six, as shown in FIG. 8, the display panel includes a driving substrate 01, an anode 02 and a black pixel defining layer 04 located on the driving substrate 01, the driving substrate 01 includes a substrate and a pixel circuit layer located on the substrate, and the black pixel defining layer 04 defines a plurality of first openings. A red light-emitting layer 031, a green light-emitting layer 032 and a blue light-emitting layer 033 are formed in the first openings. The display panel further includes a cathode 05 and an encapsulation layer 06 located on the side of the light-emitting layer away from the driving substrate. In the direction away from the driving substrate, the encapsulation layer 06 sequentially has a first planar film layer 07, a second planar film layer 08, a third planar film layer 09 and a fourth planar film layer 10. The second planar film layer 08 defines a plurality of second openings. The green filter unit 122 and the blue filter unit 123 are formed in the second openings defined by the second planar film layer 08. The second openings defined by the second planar film layer 08 correspond one-to-one to the first openings in which the green light-emitting layer 032 and the blue light-emitting layer 033 are formed. The third planar film layer 09 defines a plurality of second openings. The red filter unit 121 is formed in the second openings defined by the third planar film layer 09. The second openings defined by the third planar film layer 09 correspond one-to-one to the first openings in which the red light-emitting layer 031 is formed.

[0111] In the embodiment, the second planar film layer 08 can have a refractive index of 1.45-1.5, the green filter unit 122 and the blue filter unit 123 can have a refractive index of 1.65-1.75, for example, 1.7; the slope angle of the side surface of the second planar film layer 08 close to the second opening can be 55-85°, so that the large visual angle light emitted by the green light-emitting layer 032 and the blue light-emitting layer 033 is prone to total reflection at the interface between the second planar film layer 08 and the green filter unit 122 and the blue filter unit 123, thereby enabling more light to be emitted through the green filter unit 122 and the blue filter unit 123, and improving the light-emitting efficiency of the display panel; in order to avoid the second planar film layer 08 blocking the emission of light, so that more light is emitted through the green filter unit 122 and the blue filter unit 123, the orthographic projection of the first opening in which the green light-emitting layer 032 and the blue light-emitting layer 033 are formed on the driving substrate 01 is located within the orthographic projection of the second opening defined by the second planar film layer 08 on the driving substrate 01. In order to enable more light to be emitted through the green filter unit 122 and the blue filter unit 123 and improve the light-emitting efficiency of the display panel, the minimum distance between the orthographic projection of the boundary of the second opening defined by the second planar film layer 08 on the driving substrate 01 and the orthographic projection of the boundary of the corresponding first opening on the substrate can be 0.5-2 microns.

[0112] In the embodiment, the thickness of the second planar film layer 08 can be 1.5-2.5 microns, and the thickness of the green filter unit 122 and the blue filter unit 123 is not less than the thickness of the second planar film layer 08. In order to ensure the area of the interface between the green filter unit 122 and the blue filter unit 123 and the second planar film layer 08, so that more light is totally reflected at the interface between the green filter unit 122 and the blue filter unit 123 and the second planar film layer 08, the green filter unit 122 and the blue filter unit 123 cover the entire area of the side surface of the second planar film layer 08 close to the second opening, and extend along the side surface to cover part of the first surface of the second planar film layer 08 away from the substrate, and in some embodiments, the orthographic projection of the part of the area on the substrate can have a width of 1-5 microns.

[0113] The black matrix 11 is formed on the side of the third planar film layer 09 away from the driving substrate 01, and the orthographic projection of the black matrix 11 on the substrate is located within the orthographic projection of the black pixel defining layer 04 on the substrate; the touch electrode 13 can also be formed on the side of the first planar film layer 07 away from the driving substrate 01, so that the display panel can integrate the touch function, and in order not to affect the display, the orthographic projection of the touch electrode 13 on the substrate is located within the orthographic projection of the black matrix 11 on the substrate.

[0114] The refractive index of the third planar film layer 09 can be 1.45-1.5, and the refractive index of the red filter unit 121 can be 1.55-1.65, for example, 1.6; the slope angle of the third planar film layer 09 close to the side surface of the second opening can be 55-85°, so that the large-angle light emitted by the red light-emitting layer 031 is easily totally reflected at the interface between the third planar film layer 09 and the red filter unit 121, thereby enabling more light to be emitted through the red filter unit 121, improving the light-emitting efficiency of the display panel; in order to avoid the third planar film layer 09 blocking the emission of light, so that more light is emitted through the red filter unit 121, the orthographic projection of the first opening in which the red light-emitting layer 031 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01. In order to enable more light to be emitted through the red filter unit 121 and improve the light-emitting efficiency of the display panel, the minimum distance between the boundary of the second opening defined by the third planar film layer 09 and the orthographic projection of the boundary of the first opening on the substrate on the driving substrate 01 can be 0.5-2 microns.

[0115] In this embodiment, the thickness of the third planar film layer 09 can be 1.5-2.5 microns, and the thickness of the red filter unit 121 is not less than the thickness of the third planar film layer 09. In order to ensure the area of the interface between the red filter unit 121 and the third planar film layer 09, so that more light is totally reflected at the interface between the red filter unit 121 and the third planar film layer 09, the red filter unit 121 covers the entire area of the side surface of the third planar film layer 09 close to the second opening, and extends along the side surface to cover part of the first surface of the third planar film layer 09 away from the substrate, and in some embodiments, the orthographic projection of the part of the area on the substrate can have a width of 1-5 microns.

[0116] The touch electrode bridge 14 can also be formed on the side of the second planar film layer 08 away from the driving substrate 01, and in order not to affect display, the orthographic projection of the touch electrode bridge 14 on the substrate is located within the orthographic projection of the black matrix 11 on the substrate.

[0117] In this embodiment, the preparation sequence of each film layer when preparing the display panel is: the first planar film layer 07, the touch electrode 13, the second planar film layer 08, the green filter unit 122, the blue filter unit 123, the touch electrode bridge 14, the third planar film layer 09, the red filter unit 121, the black matrix 11, and the fourth planar film layer 10. In this embodiment, the first planar film layer 07 and the fourth planar film layer 10 do not form a second opening, so the refractive index of the first planar film layer 07 and the fourth planar film layer 10 is not limited.

[0118] In the embodiment, the red filter unit 121 has a smaller refractive index than the green filter unit 122 and the blue filter unit 123, and the distance between the red filter unit 121 and the red light-emitting layer is greater than the distance between the green filter unit 122 and the blue filter unit 123 and the light-emitting layer. This can increase the probability of total reflection of the light emitted by the red light-emitting layer at the interface between the filter unit and the third planar film layer 09, thereby increasing the light-emitting efficiency of the red pixel region. This can avoid the case that the light-emitting efficiency is different due to the difference in refractive index between the red filter unit 121 and the green filter unit 122 and the blue filter unit 123, and improve the uniformity of light emission of the display device.

[0119] In a seventh embodiment, as shown in FIG. 9, the display panel includes a driving substrate 01, an anode 02 and a black pixel defining layer 04 on the driving substrate 01, the driving substrate 01 including a substrate and a pixel circuit layer on the substrate, and the black pixel defining layer 04 defining a plurality of first openings, and a red light-emitting layer 031, a green light-emitting layer 032 and a blue light-emitting layer 033 formed in the first openings. The display panel further includes a cathode 05 and an encapsulation layer 06 on a side of the light-emitting layer away from the driving substrate. In a direction away from the driving substrate, the encapsulation layer 06 successively has a first planar film layer 07, a second planar film layer 08, a third planar film layer 09 and a fourth planar film layer 10. The first planar film layer 07 defines a plurality of second openings, and the green filter unit 122 and the blue filter unit 123 are formed in the second openings defined by the first planar film layer 07, and the second openings defined by the first planar film layer 07 correspond one-to-one to the first openings in which the green light-emitting layer 032 and the blue light-emitting layer 033 are formed. The third planar film layer 09 defines a plurality of second openings, and the red filter unit 121 is formed in the second openings defined by the third planar film layer 09, and the second openings defined by the third planar film layer 09 correspond one-to-one to the first opening in which the red light-emitting layer 031 is formed.

[0120] In the embodiment, the first flat film layer 07 can have a refractive index of 1.45-1.5, the green filter unit 122 and the blue filter unit 123 can have a refractive index of 1.65-1.75, for example, 1.7; the slope angle of the side surface of the first flat film layer 07 close to the second opening can be 55-85°, so that the large visual angle light emitted by the green light-emitting layer 032 and the blue light-emitting layer 033 is prone to total reflection at the interface between the first flat film layer 07 and the green filter unit 122 and the blue filter unit 123, so that more light can be emitted through the green filter unit 122 and the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel; in order to avoid the first flat film layer 07 blocking the emission of light, so that more light is emitted through the green filter unit 122 and the blue filter unit 123, the orthographic projection of the first opening in which the green light-emitting layer 032 and the blue light-emitting layer 033 are formed on the driving substrate 01 is located in the orthographic projection of the second opening defined by the first flat film layer 07 on the driving substrate 01. In order to make more light be emitted through the green filter unit 122 and the blue filter unit 123, thereby improving the light-emitting efficiency of the display panel, the minimum distance between the orthographic projection of the boundary of the second opening defined by the first flat film layer 07 on the driving substrate 01 and the orthographic projection of the boundary of the corresponding first opening on the substrate can be 0.5-2 microns.

[0121] In the embodiment, the thickness of the first flat film layer 07 can be 1.5-2.5 microns, and the thickness of the green filter unit 122 and the blue filter unit 123 is not less than the thickness of the first flat film layer 07. In order to ensure the area of the interface between the green filter unit 122 and the blue filter unit 123 and the first flat film layer 07, so that more light is totally reflected at the interface between the green filter unit 122 and the blue filter unit 123 and the first flat film layer 07, the green filter unit 122 and the blue filter unit 123 cover the entire area of the side surface of the first flat film layer 07 close to the second opening, and extend along the side surface to cover part of the first surface of the first flat film layer 07 away from the substrate, and in some embodiments, the width of the orthographic projection of the part of the area on the substrate can be 1-5 microns.

[0122] The black matrix 11 is formed on the side of the third flat film layer 09 away from the driving substrate 01, and the orthographic projection of the black matrix 11 on the substrate is located in the orthographic projection of the black pixel defining layer 04 on the substrate; the touch electrode 13 can also be formed on the side of the first flat film layer 07 away from the driving substrate 01, so that the display panel can realize the function of integrated touch control, and in order not to affect the display, the orthographic projection of the touch electrode 13 on the substrate is located in the orthographic projection of the black matrix 11 on the substrate.

[0123] The refractive index of the third planar film layer 09 can be 1.45-1.5, and the refractive index of the red filter unit 121 can be 1.55-1.65, for example, 1.6; the slope angle of the third planar film layer 09 close to the side surface of the second opening can be 55-85°, so that the large-angle light emitted by the red light-emitting layer 031 is easily totally reflected at the interface between the third planar film layer 09 and the red filter unit 121, thereby enabling more light to be emitted through the red filter unit 121, improving the light-emitting efficiency of the display panel; in order to avoid the third planar film layer 09 blocking the emission of light, so that more light is emitted through the red filter unit 121, the orthographic projection of the first opening in which the red light-emitting layer 031 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01. In order to enable more light to be emitted through the red filter unit 121 and improve the light-emitting efficiency of the display panel, the minimum distance between the boundary of the second opening defined by the third planar film layer 09 and the orthographic projection of the boundary of the first opening on the substrate on the driving substrate 01 can be 0.5-2 microns.

[0124] In this embodiment, the thickness of the third planar film layer 09 can be 1.5-2.5 microns, and the thickness of the red filter unit 121 is not less than the thickness of the third planar film layer 09. In order to ensure the area of the interface between the red filter unit 121 and the third planar film layer 09, so that more light is totally reflected at the interface between the red filter unit 121 and the third planar film layer 09, the red filter unit 121 covers the entire area of the side surface of the third planar film layer 09 close to the second opening, and extends along the side surface to cover part of the first surface of the third planar film layer 09 away from the substrate, and in some embodiments, the orthographic projection of the part of the area on the substrate can have a width of 1-5 microns.

[0125] The touch electrode bridge 14 can also be formed on the side of the second planar film layer 08 away from the driving substrate 01, and in order not to affect display, the orthographic projection of the touch electrode bridge 14 on the substrate is located within the orthographic projection of the black matrix 11 on the substrate.

[0126] In this embodiment, the preparation sequence of each film layer when preparing the display panel is: the first planar film layer 07, the green filter unit 122, the blue filter unit 123, the touch electrode 13, the second planar film layer 08, the touch electrode bridge 14, the third planar film layer 09, the red filter unit 121, the black matrix 11, and the fourth planar film layer 10. In this embodiment, the second planar film layer 08 and the fourth planar film layer 10 do not form a second opening, so the refractive index of the second planar film layer 08 and the fourth planar film layer 10 is not limited.

[0127] In the embodiment, the red filter unit 121 has a smaller refractive index than the green filter unit 122 and the blue filter unit 123, and the distance between the red filter unit 121 and the red light-emitting layer is greater than the distance between the green filter unit 122 and the blue filter unit 123 and the light-emitting layer, which can increase the probability of total reflection of the light emitted by the red light-emitting layer at the interface between the filter unit and the third planar film layer 09, so that the light-emitting efficiency of the red pixel region is increased. In this way, the case that the light-emitting efficiency is different due to the difference in refractive index between the red filter unit 121 and the green filter unit 122 and the blue filter unit 123 can be avoided, and the uniformity of light emission of the display device is improved.

[0128] In a specific embodiment eight, as shown in FIG. 10, the display panel includes a driving substrate 01, an anode 02 and a black pixel defining layer 04 located on the driving substrate 01, the driving substrate 01 includes a substrate and a pixel circuit layer located on the substrate, and the black pixel defining layer 04 defines a plurality of first openings, and a red light-emitting layer 031, a green light-emitting layer 032 and a blue light-emitting layer 033 are formed in the first openings. The display panel further includes a cathode 05 and an encapsulation layer 06 located on the side of the light-emitting layer away from the driving substrate. In the direction away from the driving substrate, the encapsulation layer 06 is sequentially provided with a first planar film layer 07, a second planar film layer 08, a third planar film layer 09 and a fourth planar film layer 10. The first planar film layer 07 defines a plurality of second openings, and a blue filter unit 123 is formed in the second openings defined by the first planar film layer 07, and the second openings defined by the first planar film layer 07 correspond one-to-one to the first openings in which the blue light-emitting layer 033 is formed; the second planar film layer 08 defines a plurality of second openings, and a green filter unit 122 is formed in the second openings defined by the second planar film layer 08, and the second openings defined by the second planar film layer 08 correspond one-to-one to the first openings in which the green light-emitting layer 032 is formed; and the third planar film layer 09 defines a plurality of second openings, and a red filter unit 121 is formed in the second openings defined by the third planar film layer 09, and the second openings defined by the third planar film layer 09 correspond one-to-one to the first openings in which the red light-emitting layer 031 is formed.

[0129] In the embodiment, the first planar film layer 07 can have a refractive index of 1.45-1.5, and the blue filter unit 123 can have a refractive index of 1.65-1.75, for example, 1.7. The slope angle of the side surface of the first planar film layer 07 close to the second opening can be 55-85°, so that the large-angle light emitted by the blue light-emitting layer 033 is prone to total reflection at the interface between the first planar film layer 07 and the blue filter unit 123, thereby enabling more light to be emitted through the blue filter unit 123 and improving the light-emitting efficiency of the display panel. In order to avoid the first planar film layer 07 blocking the emission of light and enable more light to be emitted through the blue filter unit 123, the orthographic projection of the first opening in which the blue light-emitting layer 033 is formed on the driving substrate 01 is located within the orthographic projection of the second opening defined by the first planar film layer 07 on the driving substrate 01. In order to enable more light to be emitted through the blue filter unit 123 and improve the light-emitting efficiency of the display panel, the minimum distance between the orthographic projection of the boundary of the second opening defined by the first planar film layer 07 on the driving substrate 01 and the orthographic projection of the boundary of the corresponding first opening on the substrate can be 0.5-2 microns.

[0130] In the embodiment, the thickness of the first planar film layer 07 can be 1.5-2.5 microns, and the thickness of the blue filter unit 123 is not less than the thickness of the first planar film layer 07. In order to ensure the area of the interface between the blue filter unit 123 and the first planar film layer 07 and enable more light to be totally reflected at the interface between the blue filter unit 123 and the first planar film layer 07, the blue filter unit 123 covers the entire area of the side surface of the first planar film layer 07 close to the second opening and extends along the side surface to cover part of the first surface of the first planar film layer 07 away from the substrate. In some embodiments, the orthographic projection of the part of the area on the substrate can have a width of 1-5 microns.

[0131] The black matrix 11 is formed on the side of the third planar film layer 09 away from the driving substrate 01, and the orthographic projection of the black matrix 11 on the substrate is located within the orthographic projection of the black pixel defining layer 04 on the substrate. The touch electrode 13 can also be formed on the side of the first planar film layer 07 away from the driving substrate 01, so that the display panel can integrate the touch function. In order not to affect the display, the orthographic projection of the touch electrode 13 on the substrate is located within the orthographic projection of the black matrix 11 on the substrate.

[0132] The refractive index of the second planar film layer 08 can be 1.45-1.5, and the refractive index of the green filter unit 122 can be 1.55-1.65, for example, 1.6; the slope angle of the side surface of the second planar film layer 08 close to the second opening can be 55-85°, so that the large-angle light emitted by the green light-emitting layer 032 is easily totally reflected at the interface between the second planar film layer 08 and the green filter unit 122, thereby enabling more light to be emitted through the green filter unit 122, improving the light-emitting efficiency of the display panel; in order to avoid the second planar film layer 08 blocking the emission of light, so that more light is emitted through the green filter unit 122, the orthographic projection of the first opening in which the green light-emitting layer 032 is formed on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01. In order to enable more light to be emitted through the green filter unit 122 and improve the light-emitting efficiency of the display panel, the minimum distance between the boundary of the second opening defined by the second planar film layer 08 and the orthographic projection of the boundary of the corresponding first opening on the substrate substrate can be 0.5-2 microns.

[0133] In the embodiment, the thickness of the second planar film layer 08 can be 1.5-2.5 microns, and the thickness of the green filter unit 122 is not less than the thickness of the second planar film layer 08. In order to ensure the area of the interface between the green filter unit 122 and the second planar film layer 08, so that more light is totally reflected at the interface between the green filter unit 122 and the second planar film layer 08, the green filter unit 122 covers the entire area of the side surface of the second planar film layer 08 close to the second opening, and extends along the side surface to cover part of the area of the first surface of the second planar film layer 08 away from the substrate substrate. In some embodiments, the width of the orthographic projection of the part of the area on the substrate substrate can be 1-5 microns.

[0134] The touch electrode bridge 14 can also be formed on the side of the second planar film layer 08 away from the driving substrate 01. In order not to affect the display, the orthographic projection of the touch electrode bridge 14 on the substrate substrate is located within the orthographic projection of the black matrix 11 on the substrate substrate.

[0135] The refractive index of the third planar film layer 09 can be 1.45-1.5, and the refractive index of the red filter unit 121 can be 1.5-1.55, for example, 1.55; the slope angle of the third planar film layer 09 close to the side surface of the second opening can be 55-85°, so that the large visual angle light emitted by the red light-emitting layer 031 is easy to be totally reflected at the interface between the third planar film layer 09 and the red filter unit 121, so that more light can be emitted through the red filter unit 121, thereby improving the light-emitting efficiency of the display panel; in order to avoid the third planar film layer 09 blocking the emission of light, so that more light is emitted through the red filter unit 121, the orthographic projection of the first opening with the red filter unit 121 on the driving substrate 01 is located within the orthographic projection of the corresponding second opening on the driving substrate 01. In order to make more light be emitted through the red filter unit 121 and improve the light-emitting efficiency of the display panel, the minimum distance between the boundary of the second opening defined by the third planar film layer 09 and the orthographic projection of the boundary of the first opening on the substrate on the substrate can be 0.5-2 microns.

[0136] In this embodiment, the thickness of the third planar film layer 09 can be 1.5-2.5 microns, and the thickness of the red filter unit 121 is not less than the thickness of the third planar film layer 09. In order to ensure the area of the interface between the red filter unit 121 and the third planar film layer 09, so that more light is totally reflected at the interface between the red filter unit 121 and the third planar film layer 09, the red filter unit 121 covers the entire area of the side surface of the third planar film layer 09 close to the second opening, and extends along the side surface to cover part of the first surface of the third planar film layer 09 away from the substrate, and in some embodiments, the width of the orthographic projection of the part on the substrate can be 1-5 microns.

[0137] In this embodiment, the fourth planar film layer 10 can be prepared by using a resin with a refractive index of 1.45-1.5.

[0138] In this embodiment, the preparation sequence of each film layer when preparing the display panel is: the first planar film layer 07, the blue filter unit 123, the touch electrode 13, the second planar film layer 08, the green filter unit 122, the touch electrode bridge 14, the third planar film layer 09, the red filter unit 121, the black matrix 11, and the fourth planar film layer 10. In this embodiment, the fourth planar film layer 10 does not form a second opening, so the refractive index of the fourth planar film layer 10 is not limited.

[0139] In this embodiment, the refractive index of the blue filter unit 123 is greater than the refractive index of the green filter unit 122, the refractive index of the green filter unit 122 is greater than the refractive index of the red filter unit 121, and the distance between the blue filter unit 123 and the blue light-emitting layer is less than the distance between the green filter unit 122 and the green light-emitting layer, and the distance between the green filter unit 122 and the green light-emitting layer is less than the distance between the red filter unit 121 and the red light-emitting layer. This can increase the probability of total reflection of light emitted by the green light-emitting layer and the red light-emitting layer at the interface between the filter unit and the flat film layer, thereby increasing the light-emitting efficiency of the green pixel region and the red pixel region. This can avoid the case that the light-emitting efficiency is different due to the difference in refractive index between the blue filter unit 123 and the green filter unit 122 and the red filter unit 121, and improve the uniformity of light emitted by the display device.

[0140] Embodiments of the present disclosure also provide a display device including the display panel as described above.

[0141] The display device includes, but is not limited to, a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply, and the like. Those skilled in the art can understand that the structure of the display device described above does not constitute a limitation on the display device, and the display device can include more or fewer components described above, or combine certain components, or different component arrangements. In the embodiments of the present disclosure, the display device includes, but is not limited to, a display, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, and the like.

[0142] The display device can be a television, a display, a digital photo frame, a mobile phone, a tablet computer, or any product or component with a display function. The display device further includes a flexible circuit board, a printed circuit board, and a back plate.

[0143] Embodiments of the present disclosure also provide a manufacturing method of a display panel, for manufacturing the display panel described above, the manufacturing method comprising:

[0144] providing a substrate substrate;

[0145] forming a pixel circuit layer, a black pixel defining layer, an encapsulation layer, and a flat layer on the substrate substrate in sequence, the black pixel defining layer has a plurality of first openings, the flat layer has a plurality of second openings, the plurality of first openings and the plurality of second openings are arranged in a direction parallel to the bearing surface of the substrate substrate, and one-to-one correspondence;

[0146] forming a light-emitting element in the first opening;

[0147] Forming a filter unit in the second opening, the color of the filter unit in each of the second openings is the same as the color of the light emitting element in the corresponding first opening;

[0148] The flat layer has a different refractive index than the filter units, and the distance between the filter units with different refractive indexes and the light emitting elements is different.

[0149] In the embodiment, the distance between the filter units with different refractive indexes and the light emitting elements is different, the filter units with different refractive indexes cooperate with the flat layer, and the efficiency of total reflection is different. In this way, by adjusting the distance between the filter units and the flat layer, the total reflection efficiency of light of different colors can be adjusted, and the light emission efficiency at the normal viewing angle of the display device can be improved.

[0150] In the method embodiments of the present disclosure, the serial numbers of the steps cannot be used to limit the sequence of the steps, and for those skilled in the art, the changes in the sequence of the steps without creative labor are within the protection scope of the present disclosure.

[0151] It should be noted that each of the embodiments in the present specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment mainly describes the differences from other embodiments. In particular, for the embodiment, since it is basically similar to the product embodiment, it is described more simply, and the related parts can be referred to the part of the description of the product embodiment.

[0152] Unless otherwise defined, technical terms or scientific terms used in the present disclosure should be understood as the common meaning thereof to those skilled in the art. The terms "first", "second" and similar words used in the present disclosure do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar words mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like only represent relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0153] It can be understood that when an element such as a layer, a film, a region or a substrate is referred to as being "on" or "under" another element, it can be "directly" on or under the other element, or there can be an intermediate element.

[0154] In the description of the above-mentioned embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0155] The above description is merely illustrative of the disclosure, and the scope of the disclosure is not limited thereto. Any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the disclosure, and all such changes or substitutions should be encompassed within the scope of the disclosure. Therefore, the scope of the disclosure should be construed according to the scope of the claims.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate substrate; a pixel circuit layer, a black pixel defining layer, an encapsulation layer and a planarization layer which are sequentially stacked on one side of the substrate substrate and away from the substrate substrate, the black pixel defining layer has a plurality of first openings, the planarization layer has a plurality of second openings, the plurality of first openings and the plurality of second openings are arranged in pairs and correspondingly in pairs along a direction parallel to a bearing surface of the substrate substrate; a light emitting element located in each of the first openings; a filter unit located in each of the second openings, the color of the filter unit in each of the second openings is the same as the color of the light emitting element in the corresponding first opening; wherein the refractive index of the planarization layer is less than the refractive index of the filter unit, and the distance between the filter units with different refractive indices and the light emitting elements is different.

2. The display panel of claim 1, wherein, The filter unit comprises first filter units and second filter units with different colors, the refractive index of the first filter units is greater than the refractive index of the second filter units, and the distance between the first filter units and the plane where the light emitting elements are located is less than the distance between the second filter units and the plane where the light emitting elements are located.

3. The display panel of claim 2, wherein, The filter unit further comprises third filter units, the refractive index of the third filter units is the same as that of the second filter units, and the distance between the third filter units and the plane where the light emitting elements are located is equal to the distance between the second filter units and the plane where the light emitting elements are located.

4. The display panel of claim 2, wherein, The filter unit further comprises third filter units, the refractive index of the third filter units is less than the refractive index of the second filter units, and the distance between the third filter units and the plane where the light emitting elements are located is greater than the distance between the second filter units and the plane where the light emitting elements are located.

5. The display panel of any one of claims 1-4, wherein, The slope angle of the side surface of the planarization layer close to the second opening is 55-85°.

6. The display panel of any one of claims 1-4, wherein, The filter unit covers the entire area of the side surface of the planarization layer close to the second opening, and extends along the side surface to cover part of the first surface of the planarization layer away from the substrate substrate.

7. The display panel of claim 6, wherein, The width of the orthographic projection of the part area on the substrate substrate is 1-5 microns.

8. The display panel of any one of claims 1-4, wherein, The orthographic projection of the first opening on the substrate substrate is located within the orthographic projection of the corresponding second opening on the substrate substrate.

9. The display panel of claim 8, wherein: the minimum distance between the orthographic projection of the boundary of the second opening on the substrate substrate and the orthographic projection of the boundary of the corresponding first opening on the substrate substrate is 0.5-2 microns.

10. The display panel of any one of claims 2-4, wherein, The planarization layer comprises a plurality of planar film layers which are sequentially stacked away from the substrate substrate; wherein the refractive index of at least one planar film layer for forming the second opening in the plurality of planar film layers is less than the refractive index of the filter unit.

11. The display panel of claim 10, wherein, The refractive index of the planar film layer for forming the second opening is 1.45-1.

5.

12. The display panel of claim 10, wherein, The plurality of planar film layers further comprise a first planar film layer located between the first filter unit and the encapsulation layer, and the first planar film layer is not provided with the second opening.

13. The display panel of any one of claims 1-4, wherein, The display panel further comprises: A black matrix located between adjacent filter units, a projection of the black matrix on the substrate substrate is located within a projection of the black pixel defining layer on the substrate substrate.

14. The display panel of claim 13, wherein, The display panel further comprises: A touch electrode located between adjacent filter units, a projection of the touch electrode on the substrate substrate is located within a projection of the black matrix on the substrate substrate.

15. A display device comprising: The display panel comprises any one of claims 1-14.

16. A manufacturing method of a display panel, comprising: The display panel comprises: A substrate substrate is provided; A pixel circuit layer, a black pixel defining layer, an encapsulation layer and a planar layer are sequentially formed on the substrate substrate, the black pixel defining layer has a plurality of first openings, the planar layer has a plurality of second openings, the plurality of first openings and the plurality of second openings are arranged in a direction parallel to the bearing surface of the substrate substrate, and one-to-one correspondence; A light emitting element is formed in the first opening; A filter unit is formed in the second opening, the color of the filter unit in each second opening is the same as the color of the light emitting element in the corresponding first opening; Wherein, the refractive index of the planar layer is less than the refractive index of the filter unit, the distance between the filter units with different refractive indexes and the light emitting element is different.

Images