Display panel and display apparatus

Abstract

Disclosed in the present disclosure are a display panel and a display apparatus. The display panel in one embodiment comprises: a base substrate (100), a light-emitting unit layer (102), a light-shielding layer (103), and a light filter (108) which is disposed in an opening of the light-shielding layer (103), wherein the light-emitting unit layer (102) comprises a plurality of light-emitting units, the plurality of light-emitting units comprise a first light-emitting unit that emits blue light, a second light-emitting unit that emits red light, and a third light-emitting unit that emits green light, and the following relational expressions are satisfied: expression (1), expression (2), and expression (3). The embodiments of the present disclosure provide the relationships between the openings of light-emitting units of three colors and a light filter, thereby reducing the decay rate of a luminance-decay curve over the angle of view.

Description

Display panel and display device

[0001] The present application claims priority to the Chinese patent application No. 202410643041.6, filed on May 22, 2024, and entitled "Display panel and display device", the content of which is understood to be incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of display, and in particular, to a display panel and a display device. BACKGROUND

[0003] In recent years, the organic light-emitting diode (OLED) light-emitting display technology has played an increasingly important role in people's production and life. As a new generation of display technology, OLED is prepared from organic small molecules or polymers. OLED gradually becomes the most ideal display technology in the industry due to its soft light emission, fast response speed, full color saturation, wide viewing angle and other advantages, and has a broad application prospect.

[0004] According to the direction of light emission, OLED devices can be divided into bottom-emitting OLED devices and top-emitting OLED devices. Although the top-emitting device increases the light transmission area, the OLED top-emitting device has a more obvious phenomenon of brightness decay at a large viewing angle compared with other display devices. The just noticeable color difference (JNCD) significantly increases at a large viewing angle, and the brightness significantly decays.

[0005] Therefore, it is necessary to provide a display product capable of effectively reducing the brightness decay rate. SUMMARY

[0006] A first aspect of the present disclosure provides a display panel, comprising: a substrate substrate, a light-emitting unit layer, a light-shielding layer, and a filter disposed in an opening of the light-shielding layer, which are sequentially arranged. The light-emitting unit layer comprises a plurality of light-emitting units, and the plurality of light-emitting units comprise a first light-emitting unit emitting blue light, a second light-emitting unit emitting red light, and a third light-emitting unit emitting green light. The following relationship is satisfied:

[0007] wherein Y B represents a pixel opening width of the first light-emitting unit, θ 1B represents an included angle between a normal line along a pixel opening edge of the first light-emitting unit and a line connecting the pixel opening edge to a corresponding edge of the light-shielding layer opening close to the normal line, and θ 2Brepresents an included angle between a normal line along a pixel opening edge of the first light emitting unit and a connecting line of the pixel opening edge to an edge of the corresponding light shielding layer opening away from the normal line,

[0008] Y R represents a pixel opening width of the second light emitting unit, θ 1R represents an included angle between a normal line along a pixel opening edge of the second light emitting unit and a connecting line of the pixel opening edge to an edge of the corresponding light shielding layer opening close to the normal line, θ 2R represents an included angle between a normal line along a pixel opening edge of the second light emitting unit and a connecting line of the pixel opening edge to an edge of the corresponding light shielding layer opening away from the normal line, S represents a thickness of the light shielding layer,

[0009] Y G represents a pixel opening width of the third light emitting unit, θ 1G represents an included angle between a normal line along a pixel opening edge of the third light emitting unit and a connecting line of the pixel opening edge to an edge of the corresponding light shielding layer opening close to the normal line, θ 2G represents an included angle between a normal line along a pixel opening edge of the third light emitting unit and a connecting line of the pixel opening edge to an edge of the corresponding light shielding layer opening away from the normal line.

[0010] Optionally, the display panel further comprises: an encapsulation layer arranged between the light emitting unit layer and the light shielding layer, the encapsulation layer comprising a first inorganic layer, an organic layer and a second inorganic layer arranged in this order on the substrate substrate,

[0011] wherein the thickness of the organic layer is less than or equal to 7.8 μm.

[0012] Optionally, the thickness of the organic layer accounts for 80% to 83% in the total thickness of the encapsulation layer.

[0013] Optionally, the first light emitting unit comprises a first light emitting layer, and the material of the first light emitting layer is a phosphorescent material.

[0014] Optionally, the first light emitting layer comprises a host material and a guest material, and the structural general formula of the guest material is:

[0015] wherein L is selected from any one of a single bond, BR, NR, O, S and Se, n1 is 1 or 2, n2 is an integer selected from 1 to 3, n3 is 1 or 2, and n4 is an integer selected from 1 to 4;

[0016] R, R1-R4 are selected from hydrogen, deuterium, halo, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted aralkyl, substituted or unsubstituted alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted amino, substituted or unsubstituted silyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, substituted or unsubstituted heteroalkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl;

[0017] neighboring R1may be connected or fused with each other to form any one of a 5-membered ring or a 6-membered ring.

[0018] Optionally, the structure of the structural formula is selected from one of the following structural formulas:

[0019] Optionally, the atomic number of the coordinated metal of the guest material is greater than 25.

[0020] Optionally, the refractive index of the first inorganic layer and the second inorganic layer is greater than the refractive index of the organic layer, or the refractive index of the first inorganic layer and the second inorganic layer is less than the refractive index of the organic layer.

[0021] Optionally, the primary peak wavelength of the light emitted by the first light emitting unit is 430nm-480nm.

[0022] The second aspect of the present disclosure provides a display device, comprising the display panel described above.

[0023] SUMMARY

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0025] FIG. 1 shows a schematic diagram of a display panel according to an embodiment of the present disclosure;

[0026] FIG. 2 shows a structure of a light emitting unit layer in a display panel according to an embodiment of the present disclosure.

[0027] DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the present disclosure, the present disclosure will be further described in combination with preferred embodiments and drawings. In the drawings, similar components are denoted by the same reference numerals. It should be understood by those skilled in the art that the following specific description is illustrative rather than limiting, and should not limit the protection scope of the present disclosure.

[0029] Unless otherwise defined, technical terms or scientific terms used in the present disclosure shall have the meanings as understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first", "second", and similar terms are used herein to distinguish one element from another, and are not necessarily used in a sequence or order, unless otherwise specified. The terms "comprises", "comprising", "includes", "including" and the like can mean encompassing, containing or subsum-ing, but do not exclude other elements or steps.

[0030] As used herein, "on", "formed on", and "disposed on" can mean that a layer is formed or disposed directly on another layer, or that a layer is formed or disposed indirectly on another layer, i.e., with other layers between the two layers. As used herein, the term "on the same layer" means that two layers, components, members, elements, or portions can be formed by the same patterning process, and the two layers, components, members, elements, or portions are generally formed of the same material, unless otherwise specified.

[0031] The OLED top-emitting device has a more obvious problem of brightness decay with viewing angle at a large viewing angle compared to other light-emitting devices, and color deviation significantly increases at a large viewing angle, and L-Decay significantly decays.

[0032] In the related art, in medium and large size and folding products, a color filter on encapsulation (COE) is usually provided to replace a polarizing sheet. The COE structure is thinner and has a higher degree of integration, and by increasing the transmittance, increasing the light-emitting utilization efficiency, and increasing the front light intensity, the product power consumption can be reduced. However, the COE increases the front light intensity, and at the same time, causes the problem of accelerated brightness decay at a large viewing angle other than the front light, that is, the spectrum is narrowed, and the product equipped with the COE usually has a higher requirement for L-Decay, so that the spectrum of the light-emitting layer after the COE modulation is narrowed, and the L-Decay decay is accelerated. That is, the product equipped with the COE not only cannot meet the high requirement of L-Decay, but the L-Decay decay problem is even more serious.

[0033] Therefore, it is urgent to propose an improved scheme to solve the problem of too fast brightness decay of the COE display product.

[0034] To solve at least one of the above problems, referring to FIG. 1, an embodiment of the present disclosure provides a display panel, comprising:

[0035] A substrate 100, a light-emitting unit layer 102, a light-shielding layer 103, and a filter 108 disposed in an opening of the light-shielding layer 103 are sequentially arranged. The light-emitting unit layer 102 includes multiple light-emitting units, including a first light-emitting unit that emits blue light, a second light-emitting unit that emits red light, and a third light-emitting unit that emits green light, and satisfies the following relationship:

[0036] Among them, Y B θ represents the pixel aperture width of the first light-emitting unit. 1B θ represents the angle between the normal along the edge of the pixel opening of the first light-emitting unit and the line connecting the edge of the pixel opening to the edge of the corresponding light-shielding layer opening closest to the normal. 2B This represents the angle between the normal along the edge of the pixel opening of the first light-emitting unit and the line connecting the edge of the pixel opening to the edge of the corresponding light-shielding layer opening that is away from the normal.

[0037] Y R θ represents the pixel aperture width of the second light-emitting unit. 1R θ represents the angle between the normal along the edge of the pixel opening of the second light-emitting unit and the line connecting the edge of the pixel opening to the edge of the corresponding light-shielding layer opening closest to the normal. 2R S represents the angle between the normal line along the edge of the pixel opening of the second light-emitting unit and the line connecting the edge of the pixel opening to the edge of the corresponding light-shielding layer opening away from the normal line; S represents the thickness of the light-shielding layer.

[0038] Y G θ represents the pixel aperture width of the third light-emitting unit. 1G θ represents the angle between the normal along the edge of the pixel opening of the third light-emitting unit and the line connecting the edge of the pixel opening to the edge of the corresponding light-shielding layer opening closest to the normal. 2G This represents the angle between the normal along the edge of the pixel opening of the third light-emitting unit and the line connecting the edge of the pixel opening to the edge of the corresponding light-shielding layer opening that is away from the normal.

[0039] In this embodiment, by setting the structural relationship between the openings of each light-emitting unit and the openings of the light-shielding layer, the optimal distance between the edge of the opening of the light-shielding layer and the edge of the opening of the light-emitting unit can be obtained in the projection. At this distance, the light emitted from the light-emitting unit can be emitted towards the light-emitting surface of the display panel after hitting the edge of the opening of the light-shielding layer, thereby reducing the brightness decay under a wide viewing angle and reducing the L-Decay decay rate of the display product equipped with COE.

[0040] The structure of embodiments of this disclosure will be described in detail below with reference to specific examples.

[0041] Continuing to refer to FIG. 1, the display panel includes a substrate 100, and a light emitting unit layer 102, a light shielding layer 103, and a filter 108 disposed in an opening of the light shielding layer 103, which are sequentially disposed on the substrate 100. The light emitting unit layer 102 includes a plurality of light emitting units including a first light emitting unit of a first color, a second light emitting unit of a second color, and a third light emitting unit of a third color. A normal projection of the filter 108 on the substrate 100 covers a normal projection of a corresponding light emitting unit on the substrate 100, and a color of the filter 108 is consistent with a color of the corresponding light emitting unit.

[0042] Exemplarily, the first color is blue, the second color is red, and the third color is green. Of course, the present disclosure is not intended to limit the colors of the light emitting units included in the light emitting unit layer 102 to only the above three colors, and other color light emitting units can also be included if necessary. For example, white light emitting units.

[0043] Continuing to refer to FIG. 1, the effective light emitting area of the light emitting unit is defined by a pixel defining layer 101 disposed on the substrate 100, i.e., the size of the light emitting area of each light emitting unit is defined by a light emitting unit opening defined by the pixel defining layer 101.

[0044] Continuing to refer to FIG. 2, regarding the structure of the light emitting unit layer 102, exemplarily, the light emitting unit layer 102 includes a hole injection layer 112, a hole transport layer 122, an electron blocking layer 132, a light emitting layer 142, a hole blocking layer 152, an electron transport layer 162, and an electron injection layer 172, which are sequentially stacked. Of course, the light emitting material of the light emitting layer 142 in the light emitting unit opening corresponding to different light emitting units is different, thereby forming different light emitting units. In addition, those skilled in the art should understand that although not shown, an anode is also disposed below the light emitting unit layer 102, and a cathode and a cover layer (CPL) covering the cathode are also disposed above the light emitting unit layer 102.

[0045] Exemplarily, the anode can be, for example, a high work function electrode material such as transparent oxide ITO, IZO; or a composite electrode formed by ITO / Ag / ITO, Ag / IZO, CNT / ITO, CNT / IZO, GO / ITO, GO / IZO, etc.

[0046] The hole injection layer 112 can be inorganic oxide such as molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, manganese oxide, etc.; or can be P-doped (P-Dopant) with a hole transport material such as F4TCNQ, HATCN, PPDN, etc., to form a hole injection layer by co-evaporation.

[0047] The hole transport layer 122 can be made of a material having good hole transport properties, such as an arylamine or a carbazole material, such as NPB, TPD, BAFLP, DFLDPBi, TCTA, TAPC, m-MTDATA, etc.

[0048] The electron blocking layer 132 can be made of an arylamine or a carbazole material, such as CBP, PCzPA, etc. The BEBL, REBL, and GEBL can be made of the following structures, respectively.

[0049] The hole blocking layer 152 and the electron transport layer 162 can be made of an aromatic heterocyclic compound, such as a benzimidazole derivative, an imidazopyridine derivative, a benzimidazophenanthroline derivative, and other imidazole derivatives; a pyrimidine derivative, a triazine derivative, and other azine derivatives; a quinoline derivative, an isoquinoline derivative, a phenanthroline derivative, and other compounds containing a nitrogen-containing six-membered ring structure, such as TAZ, p-EtTAZ, BPhen, BCP, TPBi, Liq, etc.

[0050] The electron injection layer 172 can be made of a substance having electron transport capability, and also having an effect of injecting electrons from the cathode and excellent film formation capability, such as an alkali metal or a metal, including but not limited to LiF, Yb, Mg, Ca, or a compound thereof, etc.

[0051] The cathode material can be made of a material having a low work function, so as to easily inject electrons into the organic layer, and also have good light transmittance and conductivity. For example, a metal, a metal oxide, a metal alloy, such as aluminum (Al), silver (Ag), gold (Au), magnesium (Mg), calcium (Ca), ytterbium (Yb), indium (In), lithium (Li), potassium (K), sodium (Na), tin (Sn), titanium (Ti), lead (Pb), samarium (Sm), yttrium (Y), indium tin oxide (ITO), a magnesium-silver alloy (Mg:Ag), a ytterbium-gold alloy (Yb:Au), a ytterbium-silver alloy (Yb:Ag), a lithium-aluminum alloy (Li:Al), a lithium-calcium-magnesium alloy (Li:Ca:Mg), etc.; and a laminated material, such as magnesium / aluminum (Mg / Al), magnesium / silver (Mg / Ag), aluminum / silver (Al / Ag), aluminum / gold (Al / Au), ytterbium / gold (Yb / Au), ytterbium / silver (Yb / Ag), calcium / magnesium (Ca / Mg), calcium / silver (Ca / Ag), barium / silver (Ba / Ag), etc.

[0052] The cover layer can be made of a material capable of improving the light emission efficiency of the device and increasing the service life of the device, and can be a hole-type material, such as an arylamine, or an electron-type material.

[0053] Referring to FIG. 1, a normal projection of the filter 108 in the light-shielding layer opening of the light-shielding layer 103 disposed on the light-emitting unit layer 102 on the substrate 100 covers a normal projection of the corresponding light-emitting unit opening on the substrate 100.

[0054] In particular, in the embodiments of the present disclosure, the light-emitting unit opening width Y, the thickness S of the light-shielding layer 103, and the relationship between the opening edge of the light-shielding layer 103 and the light-emitting unit opening edge are considered, and an optimal relationship is set to reduce the L-Decay of each light-emitting unit.

[0055] Referring to FIG. 1, the light-emitting colors of the light-emitting layers in the light-emitting unit layer 102 shown in the figure are not distinguished in FIG. 1, and thus each physical parameter does not include a subscript.

[0056] Referring to FIG. 1, the angle between the normal to the pixel opening edge of the light-emitting unit and the line connecting the pixel opening edge to the edge of the corresponding light-shielding layer opening close to the normal is θ1, the angle between the normal to the pixel opening edge of the light-emitting unit and the line connecting the pixel opening edge to the edge of the corresponding light-shielding layer opening away from the normal is θ2, the distance between the normal to the pixel opening edge of the light-emitting unit and the edge of the corresponding light-shielding layer opening close to the normal is L, and the thickness of the light-shielding layer 103 is S.

[0057] It should be noted that although the angles θ1 and θ2 and the distance L are shown in the current cross-sectional view along the normal to the left side edge of the light-emitting unit opening and are marked between the right side edges, it should be understood that the angle relationship and the distance between the left side edge and the right side edge are symmetrical.

[0058] In the embodiments of the present disclosure, for light-emitting devices of different colors, the following relationship is satisfied:

[0059] Y B represents the pixel opening width of the first light-emitting unit, θ 1B represents the angle between the normal to the pixel opening edge of the first light-emitting unit and the line connecting the pixel opening edge to the edge of the corresponding light-shielding layer opening close to the normal, θ 2B represents the angle between the normal to the pixel opening edge of the first light-emitting unit and the line connecting the pixel opening edge to the edge of the corresponding light-shielding layer opening away from the normal,

[0060] Y R represents the pixel opening width of the second light-emitting unit, θ 1R represents the angle between the normal to the pixel opening edge of the second light-emitting unit and the line connecting the pixel opening edge to the edge of the corresponding light-shielding layer opening close to the normal, θ 2Rrepresents an included angle between a normal along a pixel opening edge of the second light emitting unit and a line connecting the pixel opening edge to an edge of a corresponding light shielding layer opening away from the normal, S represents a thickness of the light shielding layer,

[0061] Y G represents a pixel opening width of the third light emitting unit, θ 1G represents an included angle between a normal along a pixel opening edge of the third light emitting unit and a line connecting the pixel opening edge to an edge of a corresponding light shielding layer opening close to the normal, θ 2G represents an included angle between a normal along a pixel opening edge of the third light emitting unit and a line connecting the pixel opening edge to an edge of a corresponding light shielding layer opening away from the normal.

[0062] That is, in the embodiments of the present disclosure, according to different light emitting angles of light emitting units of different colors, the geometric relationship between the light emitting unit opening of the light emitting unit, the opening edge of the corresponding light shielding layer opening and the thickness of the light shielding layer is utilized to limit the condition relationship required to be met between the light emitting angle of the light emitting unit of different colors and the thickness of the light shielding layer.

[0063] S is the thickness of the light shielding layer, which is optional, S also corresponds to the thickness of the filter, θ1 and θ2 are the exit angles, L is the distance between the normal along the pixel opening edge of the light emitting unit and the edge of the corresponding light shielding layer opening close to the normal, the distance L has a geometric relationship with the thickness S and the angles θ1 and θ2. In the case of fixed angles θ1 and θ2, the thickness S increases, the filter transmittance decreases, and the spectrum after the filter modulation becomes narrower, thereby affecting the light emitting efficiency and aggravating the L-decay; when the thickness S is fixed, the larger the exit angles θ1 and θ2, the lower the filter transmittance, which affects the light emitting efficiency. And the angle θ1 and θ2 are too large, the length of the light shift will be longer, thereby affecting the light emission, so there is a mutual influence relationship among θ1 and θ2, S and L. In order to comprehensively consider the influence among the three, the relationship is set.

[0064] Through the above setting, based on the light emitting angle of the light emitting unit, the numerical relationship required to be met between the pixel opening of each color light emitting unit and the corresponding filter is regulated, thereby preventing the light shielding layer limiting the filter from affecting the light emitting amount, and at the same time regulating the exit light of each color light emitting unit, so that more light is emitted towards the light emitting surface of the display panel, thereby significantly reducing the decay rate of the brightness with the view angle decay curve.

[0065] Continuing to refer to FIG. 1, the display panel further comprises an encapsulation layer arranged between the light emitting unit layer 102 and the light shielding layer 103, the encapsulation layer comprising a first inorganic layer 104, an organic layer 105 (IJP) and a second inorganic layer 106 arranged in this order on the substrate 100.

[0066] Considering that the thickness of the encapsulation layer is thicker than the thickness of other film layers, the light attenuation effect is the largest, and the thickness of the organic layer 105 in the encapsulation layer is relatively larger, that is, the organic layer 105 has the most significant effect on L-Decay under a large viewing angle.

[0067] Optionally, the thickness of the organic layer 105 is less than or equal to 7.8 μm.

[0068] By thinning the thickness of the organic layer 105 in the encapsulation layer to meet the range, the decay rate of L-Decay under a large viewing angle can be significantly slowed down. At the same time, when the thickness of the organic layer 105 is thinned, the thickness of the display panel as a whole can also be thinned, which is beneficial to the thinning of the display panel.

[0069] In addition, considering that the organic layer 105 in the encapsulation layer has a planarization effect while protecting the light-emitting device and the circuit structure thereunder, in order to ensure that the reduction of the thickness of the organic layer 105 does not affect the planarization effect, optionally, the proportion of the thickness of the organic layer 105 in the total thickness of the encapsulation layer is 80% to 83%.

[0070] Further optionally, the refractive index of the first inorganic layer 104 and the second inorganic layer 106 is greater than the refractive index of the organic layer 105, or the refractive index of the first inorganic layer 104 and the second inorganic layer 106 is less than the refractive index of the organic layer 105.

[0071] By alternately arranging the refractive indexes of the layers in the encapsulation layer, the refraction effect can be enhanced by means of the interface relationship between different media, the light exit angle can be improved, and the brightness decay can be alleviated.

[0072] Continuing to refer to the example shown in FIG. 1, optionally, in addition to the above film layers, the display panel further includes an input sensing layer 107 arranged between the encapsulation layer and the light shielding layer 103, and a protective layer 109 covering the light shielding layer 107 and the light filter 108. Of course, this structure is not restrictive, and can be increased or decreased according to the specific product function setting.

[0073] In another optional embodiment, in order to further improve the L-Decay of the light-emitting unit emitting blue light under a large viewing angle, a phosphor material is introduced into the first light-emitting unit.

[0074] Optionally, the first light-emitting unit includes a first light-emitting layer, and the material of the first light-emitting layer is a phosphor material.

[0075] By the setting, the material system originally discarded as the disadvantage of the light-emitting material of the light-emitting device is referenced to the first light-emitting layer of the first light-emitting unit of the display panel with COE by virtue of the characteristics of the material itself of the blue phosphor light-emitting system, i.e., the wide half-peak width and low color purity, the light spectrum emitted by the first light-emitting layer is narrowed by the modulation of the COE, the disadvantage of the wide half-peak width of the blue phosphor material is neutralized, the color purity is improved, the L-Decay of the first light-emitting unit under large viewing angle is further improved, and thus the blue light-emitting device with high performance is realized.

[0076] Optionally, the atomic number of the coordinated metal of the guest material is greater than 25. Optionally, the main peak wavelength of the light emitted by the first light-emitting unit is 430 nm to 480 nm.

[0077] Optionally, the first light-emitting layer comprises a host material (BH) and a guest material (BD). Exemplarily, the host material can be selected from carbazole derivatives or bipolar host materials such as SimCP, BCPO, etc., and the structure general formula of the guest material is as follows:

[0078] wherein L is selected from any one of a single bond, BR, NR, O, S, Se, n1 is 1 or 2, n2 is an integer selected from 1 to 3, n3 is 1 or 2, and n4 is an integer selected from 1 to 4;

[0079] R, R1-R4 are selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted aralkyl, substituted or unsubstituted alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted amino, substituted or unsubstituted silyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, substituted or unsubstituted heteroalkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl;

[0080] The adjacent R1 can be connected or fused with each other to form any one of a 5-membered ring or a 6-membered ring.

[0081] Exemplarily, the structure general formula of the guest material is as follows:

[0082] Exemplarily, the structure of the structure general formula is selected from one of the following structure formulas:

[0083] It should be noted that the present application is not intended to limit the materials of the light-emitting layer in the second and third light-emitting units. Exemplarily, the light-emitting layer of the second light-emitting unit can employ a red phosphor host material and a red phosphor dopant, or a red fluorescent host material and a red fluorescent dopant; the light-emitting layer of the third light-emitting unit can employ a green phosphor host material and a green phosphor dopant, or a green fluorescent host material and a green fluorescent dopant. Each host material can comprise one material or a mixture of two or more materials.

[0084] Exemplarily, the host material (RH) of the light-emitting layer of the second light-emitting unit can be selected from the DCM series materials, such as DCM, DCJTB, DCJTI, DCzDBT, etc.; the guest material (RD) can be selected from metal complexes, such as Ir(piq)2(acac), PtOEP, Ir(btp)2(acac), etc. The host material (GH) of the light-emitting layer of the third light-emitting unit can be selected from coumarin dyes, quinacridone copper derivatives, polycyclic aromatic hydrocarbons, diamine anthracene derivatives, carbazole derivatives, such as DMQA, BA-NPB, Alq3, CBP, etc.; the guest material (GD) can be a metal complex, such as Ir(ppy)3, Ir(ppy)2(acac), etc.

[0085] The following Table 1 shows the parameter comparison and simulation effect comparison of specific examples 1-3 and comparative examples 1-4 according to the present disclosure.

[0086] It should be noted that the other film layer materials, thicknesses, etc. in examples 1-3 and comparative examples 1-4 are the same, and the element is composed of: ITO / m-MTDATA:F4TCNQ 3% 10nm / m-MTDATA 100nm / CBP 10nm / BH:BD 1% 20nm / TPBI 5nm / BCP:Liq 1:1 30nm / Yb 1nm / Mg:Ag 13nm / CPL 60nm.

[0087] Table 1 Parameter comparison and simulation effect comparison of specific examples 1-3 and comparative examples 1-4 according to the present disclosure

[0088] wherein IJP represents the organic layer 105 in the encapsulation layer, Y, θ1, θ2 and S represent only the opening width of the light emitting unit, the included angle between the normal line along the pixel opening edge of the light emitting unit and the edge connecting the pixel opening edge to the edge of the corresponding light shielding layer opening close to the normal line, the included angle between the normal line along the pixel opening edge of the light emitting unit and the edge connecting the pixel opening edge to the edge of the corresponding light shielding layer opening away from the normal line, and the thickness of the light shielding layer 103, respectively, without representing the specific light emitting unit category, and the light emitting unit category is represented by whether there is a value in the L-Decay table position at 45° viewing angle, and f represents the value of .

[0089] Referring to Table 1, it can be seen that the thickness of the organic layer 105 in Examples 1 to 3 is 7.6 μm, and the proportion of the organic layer 105 in the encapsulation layer is 83%, Example 1 represents the structure parameters of the second light emitting unit emitting red light and its L-Decay at 45° viewing angle, Example 2 represents the structure parameters of the third light emitting unit emitting green light and its L-Decay at 45° viewing angle, and Example 3 represents the structure parameters of the first light emitting unit emitting blue light and its L-Decay at 45° viewing angle; the thickness of the organic layer 105 in Comparative Examples 1 to 4 is 8.4 μm, and the proportion of the organic layer 105 in the encapsulation layer is 89%, Comparative Example 1 and 2 represent the structure parameters of the second light emitting unit emitting red light and its L-Decay at 45° viewing angle, Comparative Example 3 represents the structure parameters of the third light emitting unit emitting green light and its L-Decay at 45° viewing angle, and Comparative Example 4 represents the structure parameters of the first light emitting unit emitting blue light and its L-Decay at 45° viewing angle.

[0090] Referring to Table 1, for the first light emitting unit, by selecting appropriate Y, θ1, θ2 and S, when f = 5.12 > 4.5, the L-Decay at 45° viewing angle is 60%, which slows down the decay of L-Decay relative to 63% when f = 3.99 in Comparative Example 4; for the second light emitting unit, by selecting appropriate Y, θ1, θ2 and S, when f = 5.41 > 5.0, the L-Decay at 45° viewing angle is 57%, which slows down the decay of L-Decay relative to 60% when f = 4.25 in Comparative Example 4; for the third light emitting unit, by selecting appropriate Y, θ1, θ2 and S, when f = 4.83 > 4.5, the L-Decay at 45° viewing angle is 53%, which slows down the decay of L-Decay relative to 57% when f = 4.25 in Comparative Example 2.

[0091] Further see Example 1 and Comparative Example 1, the third light emitting unit f is equal, f = 4.83 > 4.5, and the thickness of the organic layer 105 in the encapsulation layer in Example 1 is less than 7.8 μm, while the organic layer 105 in Comparative Example 1 is greater than 7.8 μm, the L-Decay at 45° viewing angle in Example 1 is 53%, relative to 55% in Comparative Example 1, slowing down the decay of L-Decay.

[0092] The following Table 2 shows the parameter comparison and simulation effect comparison of specific examples 4-6 according to the present disclosure and comparative examples 5-6, wherein the light emitting devices of Examples 1-3 and Comparative Example 5 are based on the structure of Example 3 in Table 1, and different dopant materials are used for the light emitting layer, and the light emitting device of Comparative Example 6 is based on the structure of Example 4 in Table 1, and the same dopant material as the light emitting layer in Example 5 is used as a comparison.

[0093] Table 2 Parameter comparison and simulation effect comparison of specific examples 4-6 according to the present disclosure and comparative examples 5-6

[0094] Wherein, the dopant Ph-BD1 represents a material with a structural formula of structural formula 1-1 in the above embodiment, Ph-BD2 represents a material with a structural formula of structural formula 1-2 in the above embodiment, Ph-BD3 represents a material with a structural formula of structural formula 1-3 in the above embodiment, and Fl-BD1 represents a fluorescent material.

[0095] Referring to Table 2, when the dopant of the light emitting layer of the first light emitting unit emitting blue light is selected as a phosphorescent material, the turn-on voltage of Examples 4-6 is reduced compared to the light emitting device with a fluorescent material, the luminous efficiency of Examples 4-6 is improved by 12.5%, 17.3% and 13.8% respectively compared to the light emitting device with a fluorescent material, the lifetime is also improved by 8.9%, 19.6% and 5.6%, and the decay of L-Decay at 45° viewing angle is also slowed down.

[0096] That is, by using a phosphorescent material in the blue light emitting device of the COE product, the disadvantage of the wide half peak width of the phosphorescent BD is turned into an advantage by using the spectral modulation characteristics of the optical filter, thereby improving the luminous efficiency of the blue light emitting device.

[0097] In addition, for the device structure with f < 4.5, when the material of the light emitting layer of the first light emitting unit is improved to a phosphorescent material, the L-Decay at 45° viewing angle is reduced from 63% to 60%, slowing down the decay of L-Decay.

[0098] That is, when a blue light emitting device with a phosphorescent material is used, the spectral modulation is optimized, which is equivalent to reducing the decay of L-Decay under the same conditions.

[0099] Based on the same inventive concept, the embodiments of the present disclosure further provide a display device comprising the display panel provided by the embodiments of the present disclosure. The display device solves the problem in the same principle as the aforementioned display panel, and the repeated parts of the device structure will not be described here again.

[0100] In specific implementation, the display device can be any product or component with display function, such as mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator, etc., especially the product with higher requirement for L-Decay. Other essential components of the display device should be understood by those skilled in the art, and will not be described here again, nor should it be regarded as a limitation to the present disclosure.

[0101] The present disclosure aims at the existing problems, and provides a display panel and a display device, by providing the structure of the series connection of the light emitting units, and by providing the structure relationship satisfied between the pixel opening of each color light emitting unit and the corresponding filter, the decay rate of the luminance-decay (l-decay) is significantly reduced, thereby reducing the luminance decay rate and color deviation at large viewing angle, improving the display effect, and having wide application prospect.

[0102] Obviously, the above embodiments of the present disclosure are only examples for clearly illustrating the present disclosure, and are not intended to limit the embodiments of the present disclosure. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can also be made, and it is impossible to enumerate all the embodiments here. Any obvious changes or variations derived from the technical solutions of the present disclosure are still within the protection scope of the present disclosure.

Claims

1. A display panel, comprising: The substrate substrate, the light-emitting unit layer, the light-blocking layer, the optical filter arranged in the opening of the light-blocking layer are arranged in sequence, The light emitting unit layer includes a plurality of light emitting units including first light emitting units emitting blue light, second light emitting units emitting red light, and third light emitting units emitting green light, satisfying the following relational expression: wherein Y B represents a pixel opening width of the first light emitting unit, θ 1B represents an included angle between a normal line along a pixel opening edge of the first light emitting unit and a line connecting the pixel opening edge to an edge of a corresponding light shielding layer opening close to the normal line, θ 2B represents an included angle between the normal line along the pixel opening edge of the first light emitting unit and a line connecting the pixel opening edge to an edge of the corresponding light shielding layer opening away from the normal line, Y R represents a pixel opening width of the second light emitting unit, θ 1R represents an included angle between a normal line along a pixel opening edge of the second light emitting unit and a line connecting the pixel opening edge to an edge of a corresponding light shielding layer opening close to the normal line, θ 2R represents an included angle between a normal line along a pixel opening edge of the second light emitting unit and a line connecting the pixel opening edge to an edge of a corresponding light shielding layer opening away from the normal line, S represents a thickness of the light shielding layer, Y G represents a pixel opening width of the third light emitting unit, θ 1G represents an included angle between a normal line along a pixel opening edge of the third light emitting unit and a line connecting the pixel opening edge to an edge of a corresponding light shielding layer opening close to the normal line, θ 2G represents an included angle between a normal line along a pixel opening edge of the third light emitting unit and a line connecting the pixel opening edge to an edge of a corresponding light shielding layer opening away from the normal line.

2. The display panel of claim 1, further comprising: The encapsulation layer arranged between the light-emitting unit layer and the light-blocking layer, the encapsulation layer comprises a first inorganic layer, an organic layer and a second inorganic layer arranged in sequence on the substrate substrate, The thickness of the organic layer is less than or equal to 7.8μm.

3. The display panel of claim 2, wherein, The proportion of the thickness of the organic layer in the total thickness of the encapsulation layer is 80% to 83%.

4. The display panel of claim 1, wherein, The first light-emitting unit comprises a first light-emitting layer, and the material of the first light-emitting layer is phosphorescent material.

5. The display panel of claim 4, wherein, The first light-emitting layer comprises a host material and a guest material, a general structural formula of the guest material is: Wherein L is selected from any one of single bond, BR, NR, O, S, Se, n1 is 1 or 2, n2 is an integer selected from 1 to 3, n3 is 1 or 2, n4 is an integer selected from 1 to 4; R, R1-R4 are selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted aralkyl, substituted or unsubstituted alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted amino, substituted or unsubstituted silyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, substituted or unsubstituted heteroalkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl; Adjacent R1 can be connected or fused with each other to form any one of 5-membered ring or 6-membered ring.

6. The display panel of claim 5, wherein, The structure of the structural formula is selected from one of the following structural formulas:

7. The display panel of claim 5, wherein, The atomic number of the coordinated metal of the guest material is greater than 25.

8. The display panel of claim 2 or 3, wherein, The refractive index of the first inorganic layer and the second inorganic layer is greater than the refractive index of the organic layer, or the refractive index of the first inorganic layer and the second inorganic layer is less than the refractive index of the organic layer.

9. The display panel of claim 4, wherein, The main peak wavelength of the light emitted by the first light-emitting unit is 430nm to 480nm.

10. A display device comprising the display panel of any one of claims 1-9.

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