Display panel and display device

Abstract

The present disclosure discloses a display panel and a display device. The display panel of one embodiment includes: a base substrate, a light-emitting unit layer, a shading layer, and a filter arranged in the opening of the light-shielding layer, the light-emitting unit layer includes a plurality of light-emitting units, and the plurality of light-emitting units include 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, satisfying the following relationship: #imgabs0# The embodiment of the present disclosure reduces the attenuation rate of the brightness with viewing angle attenuation curve by providing a relationship between the openings of the three color light-emitting units and the filter.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] In recent years, organic light-emitting diode (OLED) display technology has gained increasing importance in our daily lives. As a next-generation display technology, OLED is made from small organic molecules or polymers. Due to its advantages such as soft light emission, fast response time, rich color, and wide viewing angle, OLED is gradually being recognized by the industry as the most ideal display technology, with broad application prospects.

[0003] OLED devices can be divided into bottom-emitting and top-emitting devices based on the direction of light emission. Although top-emitting devices increase the area through which light passes, they exhibit a more pronounced brightness degradation compared to other display devices at wide viewing angles. At wide viewing angles, Just Noticeable Color Difference (JNCD) increases significantly, and brightness decreases significantly.

[0004] Therefore, it is necessary to provide a display product that can effectively reduce the brightness decay rate. Summary of the Invention

[0005] An object of the present disclosure is to provide a display panel and a display device to solve at least one of the problems existing in the prior art.

[0006] To achieve the above objectives, the present disclosure adopts the following technical solutions:

[0007] According to a first aspect of the present disclosure, a display panel is provided, comprising: a base substrate, a light-emitting unit layer, a light-shielding layer, and a filter disposed in an opening of the light-shielding layer, the light-emitting unit layer comprising a plurality of light-emitting units, the plurality of light-emitting units comprising 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, wherein the following relationship is satisfied:

[0008]

[0009]

[0010]

[0011] Among them, Y B represents the pixel opening width of the first light emitting unit, θ 1Brepresents the angle between the normal line 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 close to the normal line, θ 2B represents the angle between the normal line 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 away from the normal line,

[0012] Y R represents the pixel opening width of the second light emitting unit, θ 1R 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 close to the normal line, θ 2R 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,

[0013] Y G represents the pixel opening width of the third light-emitting unit, θ 1G represents the angle between the normal line 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 close to the normal line, θ 2G It represents the angle between the normal line 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 away from the normal line.

[0014] Optionally, the display panel further comprises: an encapsulation layer provided 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 stacked on the base substrate.

[0015] The thickness of the organic layer is less than or equal to 7.8 μm.

[0016] Optionally, the thickness of the organic layer accounts for 80% to 83% of the total thickness of the encapsulation layer.

[0017] Optionally, the first light-emitting unit includes a first light-emitting layer, and a material of the first light-emitting layer is a phosphorescent material.

[0018] Optionally, the first light-emitting layer includes a host material and a guest material, and the general structural formula of the guest material is:

[0019]

[0020] 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;

[0021] 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 silanyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, substituted or unsubstituted heteroalkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl;

[0022] Adjacent R1s may be connected or fused to form a 5-membered ring or a 6-membered ring. Optionally, the structure of the general structural formula is selected from one of the following structural formulas:

[0023]

[0024]

[0025] Optionally, the guest material's coordinating metal has an atomic number greater than 25.

[0026] 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.

[0027] Optionally, the main peak wavelength of the light emitted by the first light-emitting unit is 430nm-480nm.

[0028] A second aspect of the present disclosure provides a display device, comprising the display panel described above.

[0029] The beneficial effects of the present disclosure are as follows:

[0030] The present disclosure addresses the current problems by developing a display panel and a display device. By providing a structure in which light-emitting units are connected in series and by providing a satisfactory structural relationship between the pixel openings of each color light-emitting unit and the corresponding filters, the display panel and the display device significantly reduce the decay rate of the luminance with viewing angle decay curve (luminance-decay, l-decay), thereby reducing the luminance decay rate and color deviation at large viewing angles, improving the display effect, and having broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 A schematic diagram showing a display panel according to an embodiment of the present disclosure;

[0033] Figure 2 The structure of the light-emitting unit layer in the display panel according to one embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0034] To more clearly illustrate the present disclosure, the present disclosure is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be used to limit the scope of protection of the present disclosure.

[0035] Unless otherwise defined, technical or scientific terms used in this disclosure should have the ordinary meanings understood by a person of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and similar expressions used in this disclosure do not denote any order, quantity, or importance, but are simply used to distinguish different components. The terms "include," "comprising," and similar expressions mean that the element or object preceding the word encompasses the elements or objects listed after the word, and their equivalents, without excluding other elements or objects.

[0036] As used herein, the terms "on," "formed on," and "disposed on" may mean that one layer is directly formed or disposed on another layer, or indirectly formed or disposed on another layer, i.e., with another layer interposed therebetween. As used herein, unless otherwise indicated, the term "located on the same layer" means that two layers, parts, components, elements, or portions can be formed by the same patterning process and are generally formed of the same material.

[0037] Compared with other light-emitting devices, OLED top-emitting devices have a more obvious problem of brightness attenuation with viewing angle at wide viewing angles. In addition, the color shift increases significantly at wide viewing angles, and the L-decay decreases significantly.

[0038] In the related art, in medium and large-sized and folding products, a filter (Color Filter on Encapsulation, COE) is usually set to replace the polarizer. The COE structure is thinner and more integrated. By improving the transmittance, increasing the luminous utilization efficiency, and improving the front light intensity, the power consumption of the product can be reduced. However, while COE improves the front light intensity, it also leads to the problem of accelerated brightness attenuation under large viewing angles other than the front light, that is, the spectrum becomes narrower, and products equipped with COE usually have higher requirements for L-Decay. Therefore, the spectrum of the light-emitting layer after COE modulation becomes narrower, which accelerates the L-Decay attenuation. In other words, products equipped with COE not only cannot meet their high L-Decay requirements, but the L-Decay attenuation problem is even more serious.

[0039] Therefore, it is urgent to propose an improved solution to solve the problem of rapid brightness decay of COE display products.

[0040] In order to solve at least one of the above problems, refer to Figure 1 As shown, an embodiment of the present disclosure provides a display panel, comprising:

[0041] The base substrate 100, the light-emitting unit layer 102, the light-shielding layer 103, and the filter 108 disposed in the opening of the light-shielding layer 103 are sequentially arranged. The light-emitting unit layer 102 includes a plurality of light-emitting units, and the plurality of light-emitting units include 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, and the following relationship is satisfied:

[0042]

[0043]

[0044]

[0045] Among them, Y B represents the pixel opening width of the first light emitting unit, θ 1B represents the angle between the normal line 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 close to the normal line, θ 2B represents the angle between the normal line 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 away from the normal line,

[0046] Y R represents the pixel opening width of the second light emitting unit, θ 1R 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 close to the normal line, θ2R 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,

[0047] Y G represents the pixel opening width of the third light-emitting unit, θ 1G represents the angle between the normal line 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 close to the normal line, θ 2G It represents the angle between the normal line 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 away from the normal line.

[0048] In this embodiment, by setting the structural relationship between the openings of each light-emitting unit and the opening of the shading layer, the optimal distance between the opening edge of the shading layer and the opening edge of the light-emitting unit in the projection can be obtained. At this distance, the light emitted from the light-emitting unit can be emitted toward the light-emitting surface of the display panel after being irradiated by the opening edge of the shading layer, thereby reducing the brightness attenuation under a large viewing angle and reducing the L-Decay attenuation rate of the display product equipped with COE.

[0049] The structure of the embodiment of the present disclosure is described in detail below with reference to specific examples.

[0050] Continue to refer to Figure 1 As shown, the display panel includes a substrate 100, and sequentially arranged therein: the 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. 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. The orthographic projection of the filter 108 on the substrate 100 overlaps the orthographic projection of the corresponding light-emitting unit on the substrate 100, and the color of the filter 108 is consistent with the color of the corresponding light-emitting unit.

[0051] For example, 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. If necessary, light-emitting units of other colors may also be included. For example, white light-emitting units.

[0052] Continue to refer to Figure 1 As shown, the effective light emitting area of ​​the light emitting unit is defined by the pixel defining layer 101 provided on the base substrate 100 , that is, the light emitting unit opening defined by the pixel defining layer 101 determines the size of the light emitting area of ​​each light emitting unit.

[0053] join Figure 2 As shown, regarding the composition of the light-emitting unit layer 102, illustratively, 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 stacked in sequence. Of course, the light-emitting materials of the light-emitting layer 142 in the light-emitting unit openings corresponding to different light-emitting units are different, thereby forming different light-emitting units. In addition, those skilled in the art should understand that, although not shown, an anode is further provided below the light-emitting unit layer 102, and a cathode and a covering layer (CPL) covering the cathode are further provided above the light-emitting unit layer 102.

[0054] For example, the anode can be a high work function electrode material, such as transparent oxide ITO, IZO; it can also be a composite electrode formed by ITO / Ag / ITO, Ag / IZO, CNT / ITO, CNT / IZO, GO / ITO, GO / IZO, etc.

[0055] The hole injection layer 112 can be made of inorganic oxides, 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.; P-type doping (P-Dopant) can also be performed on the hole transport material, such as F4TCNQ, HATCN, PPDN, etc., to form a hole injection layer by co-evaporation.

[0056] The hole transport layer 122 is made of a material with good hole transport properties, which may be an aromatic amine or carbazole material, such as NPB, TPD, BAFLP, DFLDPBi, TCTA, TAPC, m-MTDATA, etc.

[0057] The electron blocking layer 132 may be made of aromatic amine or carbazole materials, such as CBP, PCzPA, etc.; wherein, the BEBL, REBL, and GEBL may respectively adopt the following structures.

[0058] The hole blocking layer 152 and the electron transport layer 162 can use aromatic heterocyclic compounds, such as imidazole derivatives such as benzimidazole derivatives, imidazopyridine derivatives, and benzimidazolephenanthridine derivatives; oxazine derivatives such as pyrimidine derivatives and triazine derivatives; quinoline derivatives, isoquinoline derivatives, phenanthroline derivatives, and other compounds containing nitrogen-containing six-membered ring structures such as TAZ, p-EtTAZ, BPhen, BCP, TPBi, Liq, etc.

[0059] The electron injection layer 172 is made of a material capable of transporting electrons, injecting electrons from the cathode and having excellent thin film forming ability, such as alkali metals or metals, including but not limited to LiF, Yb, Mg, Ca or their compounds.

[0060] The cathode material is a material with a low work function so that electrons can be easily injected into the organic layer, and has good light transmittance and electrical conductivity. Such as metals, metal oxides, metal alloys, 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), magnesium silver alloy (Mg:Ag), ytterbium gold alloy (Yb:Au), ytterbium silver alloy (Yb:Ag), lithium aluminum alloy (Li:Al), lithium calcium magnesium alloy (Li:Ca:Mg), etc.; and stacked materials, 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.

[0061] The covering layer is made of a material that can improve the luminous efficiency of the device and increase the service life of the device. It can be a hole-type material, such as aromatic amines, or an electron-type material.

[0062] Reference Figure 1 As shown, the orthographic projection of the filter 108 disposed in the light shielding layer opening of the light shielding layer 103 on the light emitting unit layer 102 on the base substrate 100 covers the orthographic projection of the corresponding light emitting unit opening on the base substrate.

[0063] In particular, in the embodiment of the present disclosure, the relationship between the opening width Y of the light-emitting unit, the thickness S of the shading layer 103, and the opening edge of the shading layer 103 and the opening edge of the light-emitting unit is considered, and the optimal relationship is set to reduce the L-Decay of each light-emitting unit.

[0064] Reference Figure 1 As shown, Figure 1 The luminescent colors of the luminescent layer 142 in the luminescent unit layer 102 shown in the figure are not distinguished, so the various physical parameters do not include subscripts.

[0065] Reference Figure 1 As shown, the angle between the normal line of the pixel opening edge along the light-emitting unit and the line connecting the edge of the pixel opening to the corresponding light-shielding layer opening close to the normal line is θ1, the angle between the normal line of the pixel opening edge along the light-emitting unit and the line connecting the edge of the pixel opening to the corresponding light-shielding layer opening away from the normal line is θ2, the distance between the normal line of the pixel opening edge along the light-emitting unit and the edge of the corresponding light-shielding layer opening close to the normal line is L, and the thickness of the light-shielding layer 103 is S.

[0066] It should be noted that although the figure shows angle θ1 and angle θ2 along the normal of the left edge of the light-emitting unit opening in the current cross-sectional view, and the distance L is marked between the right edges, it should be understood that the angle relationship and distance between the left edge and the side edges are symmetrical.

[0067] In the embodiments of the present disclosure, for light-emitting devices of different colors, the following relationship is satisfied:

[0068]

[0069]

[0070]

[0071] Among them, Y B represents the pixel opening width of the first light emitting unit, θ 1B represents the angle between the normal line 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 close to the normal line, θ 2B represents the angle between the normal line 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 away from the normal line,

[0072] Y R represents the pixel opening width of the second light emitting unit, θ 1R 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 close to the normal line, θ 2R 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,

[0073] Y G represents the pixel opening width of the third light-emitting unit, θ 1G represents the angle between the normal line 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 close to the normal line, θ 2G It represents the angle between the normal line 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 away from the normal line.

[0074] That is to say, in the embodiment of the present disclosure, according to the 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 and the opening edge of the corresponding light-shielding layer opening and the thickness of the light-shielding layer is utilized to define the conditional relationship that needs to be satisfied between the light-emitting angles of light-emitting units of different colors and the thickness of the light-shielding layer.

[0075] S is the thickness of the light-shielding layer. Optionally, S also corresponds to the thickness of the filter. θ1 and θ2 are the emission angles. L is the distance between the normal along the edge of the pixel opening 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. When the angles θ1 and θ2 are fixed, the thickness S increases, the filter transmittance decreases, and the spectrum modulated by the filter becomes narrower, thereby affecting the luminous efficiency and exacerbating L-decay. When the thickness S is fixed, the larger the emission angles θ1 and θ2, the lower the filter transmittance, affecting the luminous efficiency. Moreover, if the angles θ1 and θ2 are too large, the offset length of the light will increase, affecting the light output. Therefore, there is a mutual influence between θ1 and θ2, S, and L. In order to comprehensively consider the influence of these three factors, a relationship is set.

[0076] Through the above settings, based on the light-emitting angle of the light-emitting unit, the numerical relationship that needs to be satisfied between the pixel opening of each color light-emitting unit and the filter corresponding to the threshold is adjusted, thereby preventing the shading layer of the limiting filter from affecting the amount of light output. At the same time, the output light of the light-emitting unit of each color is regulated so that more light is emitted toward the light-emitting surface of the display panel, thereby significantly reducing the attenuation rate of the brightness attenuation curve with viewing angle.

[0077] Continue to refer to Figure 1 As shown, the display panel further includes: an encapsulation layer disposed between the light emitting unit layer 102 and the light shielding layer 103 , the encapsulation layer including a first inorganic layer 104 , an organic layer 105 (IJP) and a second inorganic layer 106 stacked on the base substrate 100 .

[0078] Considering that the thickness of the encapsulation layer is thicker than that of other film layers, it has the greatest impact on the attenuation of light, 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 impact on L-Decay at a wide viewing angle.

[0079] Optionally, the thickness of the organic layer 105 is less than or equal to 7.8 μm.

[0080] By reducing the thickness of the organic layer 105 in the encapsulation layer to meet this range, the L-Decay attenuation rate at a wide viewing angle can be significantly slowed. Furthermore, reducing the thickness of the organic layer 105 can also reduce the thickness of the display panel as a whole, contributing to a thinner and lighter display panel.

[0081] In addition, considering that the organic layer 105 in the encapsulation layer has a flattening effect while protecting the light-emitting device and circuit structure thereunder, in order to ensure that the reduction in the thickness of the organic layer 105 does not affect its flattening effect, optionally, the thickness of the organic layer 105 accounts for 80% to 83% of the total thickness of the encapsulation layer.

[0082] 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 .

[0083] By alternating the refractive index of each layer in the encapsulation layer, the refraction effect can be enhanced by leveraging the interface relationship between different media, improving the light emission angle and thus alleviating brightness attenuation.

[0084] Continue to refer to Figure 1 In the example shown, in addition to the above film layers, the display panel optionally further includes an input sensing layer 107 disposed between the encapsulation layer and the light shielding layer 103, and a protective layer 109 covering the light shielding layer 107 and the filter 108. Of course, this structure is not restrictive and can be increased or decreased according to the specific product function settings.

[0085] In another optional embodiment, in order to further improve the L-Decay of the light-emitting unit emitting blue light at a wide viewing angle, a phosphorescent material is introduced into the first light-emitting unit.

[0086] Optionally, the first light-emitting unit includes a first light-emitting layer, and a material of the first light-emitting layer is a phosphorescent material.

[0087] Through this arrangement, by leveraging the material characteristics of the blue phosphorescent light-emitting system, which has a wide half-width at half-maximum and low color purity, the material system that was originally abandoned due to its shortcomings as a light-emitting material for a light-emitting device is introduced into the first light-emitting layer of the first light-emitting unit of a display panel with COE. With the help of the COE's modulation effect on the spectrum, the spectrum of light emitted by the first light-emitting layer is narrowed, neutralizing the shortcomings of the blue phosphorescent material's wide half-width at half-maximum while improving the color purity, further improving the L-Decay of the first light-emitting unit at a wide viewing angle, thereby realizing a high-performance blue light-emitting device.

[0088] Optionally, the atomic number of the coordination 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.

[0089] Optionally, the first light-emitting layer includes 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. The general structural formula of the guest material is:

[0090]

[0091] 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;

[0092] 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 silanyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, substituted or unsubstituted heteroalkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl;

[0093] Adjacent R1 groups may be linked or fused to each other to form a 5-membered ring or a 6-membered ring.

[0094] Exemplarily, the general structural formula of the guest material is:

[0095]

[0096] Illustratively, the structure of the general structural formula is selected from one of the following structural formulas:

[0097]

[0098]

[0099] It should be noted that this application is not intended to limit the materials of the light-emitting layers in the second and third light-emitting units. For example, the light-emitting layer of the second light-emitting unit may use a red phosphorescent host material and a red phosphorescent dopant, or a red fluorescent host material and a red fluorescent dopant; the light-emitting layer of the third light-emitting unit may use a green phosphorescent host material and a green phosphorescent dopant, or a green fluorescent host material and a green fluorescent dopant. Each host material may include a single material or a mixture of two or more materials.

[0100] For example, the host material (RH) of the light-emitting layer of the second light-emitting unit can be selected from the DCM series of 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, quinacrine 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.

[0101] Table 1 below shows parameter comparisons and simulation effect comparisons of specific examples 1-3 and comparative examples 1-4 according to the present disclosure.

[0102] It should be noted that the other film layer materials, thicknesses and other parameters constituting the light-emitting units in Examples 1-3 and Comparative Examples 1-4 are the same, and the component composition is: ITO / m-MTDATA:F4TCNQ 3%10nm / m-MTDATA 100nm / CBP 10nm / BH:BD1%20nm / TPBI 5nm / BCP:Liq 1:130nm / Yb 1nm / Mg:Ag 13nm / CPL 60nm.

[0103] Table 1

[0104]

[0105] Among them, IJP represents the organic layer 105 in the encapsulation layer. In order to simplify the table classification, Y, θ1, θ2 and S only represent the width of the light-emitting unit opening, the angle between the normal line along the edge of the pixel opening of the light-emitting unit and the edge line from the edge of the pixel opening to the corresponding light-shielding layer opening close to the normal line, the angle between the normal line along the edge of the pixel opening of the light-emitting unit and the edge line from the edge of the pixel opening to the corresponding light-shielding layer opening away from the normal line, and the thickness of the light-shielding layer 103, but do not reflect the specific light-emitting unit category. The light-emitting unit category is reflected by whether there is a value in the L-Decay table position at a 45° viewing angle. f represents value.

[0106] 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 to the encapsulation layer is 83%. Example 1 represents the structural parameters of the second light-emitting unit emitting red light and its L-Decay at a 45° viewing angle, Example 2 represents the structural parameters of the third light-emitting unit emitting green light and its L-Decay at a 45° viewing angle, and Example 3 represents the structural parameters of the first light-emitting unit emitting blue light and its L-Decay at a 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 to the encapsulation layer is 89%. Comparative Examples 1 and 2 represent the structural parameters of the second light-emitting unit emitting red light and its L-Decay at a 45° viewing angle, Comparative Example 3 represents the structural parameters of the third light-emitting unit emitting green light and its L-Decay at a 45° viewing angle, and Comparative Example 4 represents the structural parameters of the first light-emitting unit emitting blue light and its L-Decay at a 45° viewing angle.

[0107] As shown in 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 a 45° viewing angle is 60%, which is 63% when f=3.99 in Comparative Example 4, and the attenuation of L-Decay is slowed down; for the second light-emitting unit, by selecting appropriate Y, θ1, θ2 and S, when f=5.41>5.0, the L-Decay at a 45° viewing angle is 57%, which is 60% when f=4.25 in Comparative Example 4, and the attenuation of L-Decay is slowed down; for the third light-emitting unit, by selecting appropriate Y, θ1, θ2 and S, when f=4.83>4.5, the L-Decay at a 45° viewing angle is 53%, which is 57% when f=4.25 in Comparative Example 2, and the attenuation of L-Decay is slowed down.

[0108] Further referring to 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 a viewing angle of 45° in Example 1 is 53%, which is slower than 55% in Comparative Example 1, thereby slowing down the attenuation of L-Decay.

[0109] Table 2 below shows a parameter comparison and simulation effect comparison between specific examples 4-6 and comparative examples 5-6 according to the present disclosure, wherein the light-emitting devices of Examples 1-3 and Comparative Example 5 use different dopant materials for the light-emitting layer based on the structure of Example 3 in Table 1, and the light-emitting device of Comparative Example 6 uses the same dopant material as the light-emitting layer in Example 5 as a comparison based on the structure of Example 4 in Table 1.

[0110] Table 2

[0111]

[0112]

[0113] Among them, the dopant Ph-BD1 represents a material having the structural formula 1-1 in the above embodiment, Ph-BD2 represents a material having the structural formula 1-2 in the above embodiment, Ph-BD3 represents a material having the structural formula 1-3 in the above embodiment, and Fl-BD1 represents a fluorescent material.

[0114] As shown in 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 lower than that of the light-emitting devices made of fluorescent materials. The luminous efficiency of Examples 4-6 is improved by 12.5%, 17.3% and 13.8% respectively compared with the light-emitting devices made of fluorescent materials, and the lifespan is also improved by 8.9%, 19.6% and 5.6%. At the same time, the attenuation of L-Decay at a 45° viewing angle is also slowed down.

[0115] That is to say, by using blue light-emitting devices made of phosphorescent materials in COE products, the disadvantage of the wide half-width of phosphorescent BD is turned into an advantage by utilizing the modulation characteristics of the spectrum by the filter, thereby improving the device luminous efficiency of the blue light-emitting device.

[0116] In addition, compared with 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 a 45° viewing angle is reduced from 63% to 60%, slowing down the attenuation of L-Decay.

[0117] That is to say, when a blue light-emitting device made of phosphorescent material is used, the spectrum modulation is optimized, which is equivalent to reducing the attenuation of L-Decay under the same conditions.

[0118] Based on the same inventive concept, the present disclosure also provides a display device, including the display panel provided in the present disclosure. The principle of solving the problem of the display device is similar to that of the aforementioned display panel, and the repeated device structures are not repeated here.

[0119] In a specific implementation, the display device can be any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system, particularly products with higher L-Decay requirements. Other essential components of the display device are readily understood by those skilled in the art and are not detailed here, nor should they be construed as limitations of the present disclosure.

[0120] The present disclosure addresses the current problems by developing a display panel and a display device. By providing a structure in which light-emitting units are connected in series and by providing a satisfactory structural relationship between the pixel openings of each color light-emitting unit and the corresponding filters, the display panel and the display device significantly reduce the decay rate of the luminance with viewing angle decay curve (luminance-decay, l-decay), thereby reducing the luminance decay rate and color deviation at large viewing angles, improving the display effect, and having broad application prospects.

[0121] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not intended to limit the implementation methods of the present disclosure. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solutions of the present disclosure are still within the scope of protection of the present disclosure.

Claims

1. A display panel, comprising: A base substrate, a light emitting unit layer, a light shielding layer, and a filter arranged in an opening of the light shielding layer are sequentially arranged. The light-emitting unit layer includes a plurality of light-emitting units, wherein the plurality of light-emitting units include 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, and is characterized in that the following relationship is satisfied: Among them, Y B represents the pixel opening width of the first light emitting unit, θ 1B represents the angle between the normal line 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 close to the normal line, θ 2B represents the angle between the normal line 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 away from the normal line, Y R represents the pixel opening width of the second light emitting unit, θ 1R 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 close to the normal line, θ 2R 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, Y G represents the pixel opening width of the third light-emitting unit, θ 1G represents the angle between the normal line 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 close to the normal line, θ 2G It represents the angle between the normal line 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 away from the normal line.

2. The display panel according to claim 1, wherein: Also includes: An encapsulation layer is provided between the light-emitting unit layer and the light-shielding layer, wherein the encapsulation layer includes a first inorganic layer, an organic layer, and a second inorganic layer stacked on the base substrate. Wherein, the thickness of the organic layer is less than or equal to 7.8 μm.

3. The display panel according to claim 2, wherein: The thickness of the organic layer accounts for 80% to 83% of the total thickness of the encapsulation layer.

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

5. The display panel according to claim 4, wherein: The first light-emitting layer includes a host material and a guest material, and the general structural formula of the guest material is: 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; 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 silanyl, 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 groups may be linked or fused to each other to form a 5-membered ring or a 6-membered ring.

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

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

8. The display panel according to claim 2 or 3, characterized in that: 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 according to claim 4, characterized in that The main peak wavelength of the light emitted by the first light-emitting unit is 430nm to 480nm.

10. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 9.

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