Display panel and display device

Abstract

The embodiment of the invention discloses a display panel and a display device. In one specific implementation mode, the display panel comprises a display substrate, a color film layer and a light regulation and control layer, the color film layer and the light regulation and control layer are located on the light emitting side of the display substrate, and the light regulation and control layer comprises a quarter-wave plate and a guest-host liquid crystal layer located on the side, away from the display substrate, of the quarter-wave plate. And the liquid crystal molecule orientation direction of the guest-host liquid crystal layer is located in the display surface of the display substrate. According to the embodiment, the light regulation and control layer is arranged on the light emitting side of the display substrate, the visual angle characteristic of the display panel can be effectively improved on the basis of ensuring the reflectivity and the power consumption benefit of the display panel, and large-visual-angle display of the display panel is achieved.

Description

Technical Field

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

[0002] In the related technology of forming a color filter on encapsulation (COE) on the encapsulation layer of the display substrate to replace the polarizer (POL), there are problems such as the reflectivity of the COE structure is higher than that of the POL structure, and the viewing angle characteristics (L-decay) of the COE structure are worse than those of the POL structure. Summary of the Invention

[0003] 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.

[0004] To achieve the above objectives, the present disclosure adopts the following technical solutions: In a first aspect, the present disclosure provides a display panel, comprising a display substrate and a color filter layer and a light regulation layer located on the light-emitting side of the display substrate, wherein the light regulation layer comprises a quarter-wave plate and a guest-host liquid crystal layer located on the side of the quarter-wave plate away from the display substrate, wherein the orientation direction of the liquid crystal molecules in the guest-host liquid crystal layer is located within the display surface of the display substrate.

[0005] Optionally, the light regulating layer is located on a side of the color filter layer away from the display substrate.

[0006] Optionally, the light regulating layer further includes a first protective layer.

[0007] Optionally, the light regulating layer further includes a first alignment layer for configuring the alignment direction of liquid crystal molecules in the guest-host liquid crystal layer.

[0008] Optionally, the transmittance of the guest-host liquid crystal layer is configured to be greater than 75%.

[0009] Optionally, the color filter layer has a thickness of less than 3 μm.

[0010] Optionally, the light regulating layer further includes a half wave plate located between the quarter wave plate and the guest-host liquid crystal layer.

[0011] Optionally, the absorption spectrum of the dichroic dye molecules of the guest-host liquid crystal layer corresponds to the visible light wavelength range.

[0012] Optionally, the display substrate is an OLED display substrate.

[0013] A second aspect of the present disclosure provides a display device, comprising the display panel provided in the first aspect of the present disclosure.

[0014] The beneficial effects of the present disclosure are as follows: This embodiment provides a light regulating layer on the light-emitting side of the display substrate, thereby effectively improving the viewing angle characteristics of the display panel while ensuring the reflectivity and power consumption benefits of the display panel, thereby achieving wide viewing angle display of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0016] Figure 1 A schematic structural diagram of a display panel in related art is shown.

[0017] Figures 2 to 9 Several structural schematic diagrams of display panels provided by embodiments of the present invention are shown.

[0018] Figure 10 A schematic diagram showing the light transmittance of a display panel provided by an embodiment of the present invention at a normal viewing angle is shown.

[0019] Figure 11 A schematic diagram showing the light transmittance of a display panel provided by an embodiment of the present invention at a wide viewing angle is shown.

[0020] Figure 12 A schematic diagram showing the light emission of a display panel in a bright state in the related art is shown.

[0021] Figure 13 A schematic diagram showing the light emission of a display panel in a bright state provided by an embodiment of the present invention is shown.

[0022] Figure 14 A schematic diagram showing dark-state light emission of a display panel in related art is shown.

[0023] Figure 15 A schematic diagram illustrating dark-state light emission of a display panel provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0024] The terms “on,” “formed on,” and “disposed on” used in the present disclosure may mean that one layer is directly formed or disposed on another layer, or may mean that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers.

[0025] It should be noted that although the terms "first," "second," etc. may be used herein to describe various parts, components, elements, regions, layers, and / or portions, these parts, components, elements, regions, layers, and / or portions should not be limited by these terms. Rather, these terms are used to distinguish one part, component, element, region, layer, and / or portion from another. Thus, for example, the first part, first member, first element, first region, first layer, and / or first portion discussed below may be referred to as a second part, second member, second element, second region, second layer, and / or second portion without departing from the teachings of the present disclosure.

[0026] In this disclosure, unless otherwise specified, the term "co-layered" refers to two layers, components, members, elements, or parts that can be formed using the same manufacturing process (e.g., patterning process) and are generally made of the same material. For example, co-layered arrangement of two or more functional layers means that these functional layers can be formed using the same material layer and the same manufacturing process, thereby simplifying the display substrate manufacturing process.

[0027] In this disclosure, unless otherwise specified, the expression "patterning process" generally includes steps such as photoresist coating, exposure, development, etching, and photoresist stripping. The expression "one-time patterning process" means a process of forming patterned layers, components, members, etc. using one mask.

[0028] In the related art of forming a color filter on the encapsulation layer of the display substrate instead of a polarizer, there is a problem that the reflectivity of the COE structure is higher than that of the POL structure, and the viewing angle characteristics of the COE structure are worse than those of the POL structure.

[0029] like Figure 1 As shown, the display panel in the related art includes a display substrate 10 and a color filter layer 20. The display substrate 10 includes a substrate 101 (PI), a driving circuit layer 102 (TFT), a planarization layer 103 (PLN), an anode 104 (AND), a pixel definition layer 105 (PDL), a first light-emitting layer 1061, a second light-emitting layer 1062, a third light-emitting layer 1063, a spacer layer 107 (PS), a cathode 108 (CTD), a first encapsulation layer 109 (CVD1), a second encapsulation layer 1010 (IJP), a third encapsulation layer 1011 (CVD2), a touch buffer layer 1012 (TBL), a first touch electrode 1013 (TMA), a touch insulating layer 1014 (TLD), a second touch electrode 1015 (TMB), and a touch planarization layer 1016 (TOC). Among them, the first light-emitting layer 1061 is a blue light-emitting layer, the second light-emitting layer 1062 is a red light-emitting layer, and the third light-emitting layer 1063 is a green light-emitting layer.

[0030] like Figure 1 As shown, the color filter layer 20 includes a black matrix layer 201 (BM), a first color filter 2021, a second color filter 2022, a third color filter 2023, and a cover layer 203 (COC). The first color filter 2021 is a blue color filter, the second color filter 2022 is a red color filter, and the third color filter 2023 is a green color filter.

[0031] like Figure 1 The display panel of the related art shown in the figure replaces the polarizer by forming a color filter on the encapsulation layer, that is, the circular polarizer in the related art is replaced by light absorption through the color filter and the black matrix layer.

[0032] However, in Figure 1 In the display panel of the related art shown, the color filter has limited absorption of ambient light, so the reflectivity of the COE structure is higher than that of the POL structure. Furthermore, because the equivalent thickness 402 of the color filter at a wide viewing angle is greater than the equivalent thickness 401 at a normal viewing angle, the transmittance of the color filter at a wide viewing angle is lower than that of the color filter at a normal viewing angle. Even without considering the light-shielding effect of the black matrix layer, the viewing angle characteristics of the COE structure are inferior to those of the POL structure. Therefore, how to balance the parameters of power consumption, reflectivity, and viewing angle characteristics is an issue that requires ongoing research.

[0033] In view of this, one embodiment of the present invention provides a display panel, comprising a display substrate and a color filter layer and a light regulation layer located on the light-emitting side of the display substrate, the light regulation layer comprising a quarter-wave plate and a guest-host liquid crystal layer located on the side of the quarter-wave plate away from the display substrate, the liquid crystal molecules of the guest-host liquid crystal layer being oriented in a direction within the display surface of the display substrate.

[0034] In the first specific example, if Figure 2 As shown, the display panel includes a display substrate 10 and a color filter layer 20 and a light regulation layer 30 located on the light-emitting side of the display substrate 10. The light regulation layer 30 includes a quarter-wave plate 301 and a guest-host liquid crystal layer 302 located on the side of the quarter-wave plate 301 away from the display substrate 10. The orientation direction X of the liquid crystal molecules 303 of the guest-host liquid crystal layer 302 is located within the display surface of the display substrate 10.

[0035] Further, such as Figure 2As shown, the display substrate 10 includes a substrate 101 (PI), a driving circuit layer 102 (TFT), a planarization layer 103 (PLN), an anode 104 (AND), a pixel definition layer 105 (PDL), a first light-emitting layer 1061, a second light-emitting layer 1062, a third light-emitting layer 1063, a spacer layer 107 (PS), a cathode 108 (CTD), a first encapsulation layer 109 (CVD1), a second encapsulation layer 1010 (IJP), a third encapsulation layer 1011 (CVD2), a touch buffer layer 1012 (TBL), a first touch electrode 1013 (TMA), a touch insulating layer 1014 (TLD), a second touch electrode 1015 (TMB), and a touch planarization layer 1016 (TOC). The first light-emitting layer 1061 is a blue light-emitting layer, the second light-emitting layer 1062 is a red light-emitting layer, and the third light-emitting layer 1063 is a green light-emitting layer.

[0036] Further, such as Figure 1 As shown, the color filter layer 20 includes a black matrix layer 201 (BM), a first color filter 2021, a second color filter 2022, a third color filter 2023, and a cover layer 203 (COC). The first color filter 2021 is a blue color filter, the second color filter 2022 is a red color filter, and the third color filter 2023 is a green color filter.

[0037] Further, such as Figure 2 As shown, the light control layer 30 includes a first alignment layer 304 disposed between the quarter wave plate 301 and the guest-host liquid crystal layer 302 ; and a second alignment layer 305 disposed between the touch flat layer 1016 and the quarter wave plate 301 .

[0038] In the second specific example, if Figure 2 and Figure 3 As shown, the difference between the second specific example and the first specific example is that the color filter layer 20 in the first specific example is arranged between the display substrate 10 and the light regulation layer 30, and the light regulation layer 30 in the second specific example is arranged between the display substrate 10 and the color filter layer 20.

[0039] Further, such as Figure 3 As shown, the color filter layer 20 is located above the guest-host liquid crystal layer and the quarter-wave plate 301 , and the position exchange of the light regulation layer and the color filter layer in the stacked structure will not affect the front light emission.

[0040] In the third specific example, if Figure 2 and Figure 4 As shown, the difference between the third specific example and the first specific example is that the light regulation layer 30 in the third specific example further includes a first protective layer 306 , and the first protective layer 306 is arranged on the side of the guest-host liquid crystal layer 302 away from the display substrate 10 .

[0041] In the fourth specific example, if Figure 2 and Figure 5 As shown, the difference between the fourth specific example and the first specific example is that the light control layer 30 in the fourth specific example also includes a first protective layer 306 and a module material layer 307, and the first protective layer 306 is arranged on the side of the guest-host liquid crystal layer 302 away from the display substrate 10; the module material layer 307 is arranged between the covering layer 203 and the second alignment layer 305.

[0042] In the fifth specific example, if Figure 2 and Figure 6 As shown, the difference between the fifth specific example and the first specific example is that the light control layer 30 in the fifth specific example also includes a half wave plate 308 located between the quarter wave plate 301 and the guest-host liquid crystal layer 302; specifically, the half wave plate 308 is arranged between the quarter wave plate 301 and the first alignment layer 304.

[0043] In the sixth specific example, if Figure 3 and Figure 7 As shown, the difference between the sixth specific example and the second specific example is that the light control layer 30 in the sixth specific example also includes a half wave plate 308 located between the quarter wave plate 301 and the guest-host liquid crystal layer 302; specifically, the half wave plate 308 is arranged between the quarter wave plate 301 and the first alignment layer 304.

[0044] In the seventh specific example, if Figure 4 and Figure 8 As shown, the difference between the seventh specific example and the third specific example is that the light control layer 30 in the seventh specific example also includes a half wave plate 308 located between the quarter wave plate 301 and the guest-host liquid crystal layer 302; specifically, the half wave plate 308 is arranged between the quarter wave plate 301 and the first alignment layer 304.

[0045] In the eighth specific example, if Figure 5 and Figure 9 As shown, the difference between the eighth specific example and the fourth specific example is that the light control layer 30 in the eighth specific example also includes a half wave plate 308 located between the quarter wave plate 301 and the guest-host liquid crystal layer 302; specifically, the half wave plate 308 is arranged between the quarter wave plate 301 and the first alignment layer 304.

[0046] This embodiment provides a light regulating layer on the light-emitting side of the display substrate, thereby effectively improving the viewing angle characteristics of the display panel while ensuring the reflectivity and power consumption benefits of the display panel, thereby achieving wide viewing angle display of the display panel.

[0047] The guest-host liquid crystal display mode utilizes the polarization properties of liquid crystal molecules and the interaction between dye molecules and liquid crystal molecules. In this mode, a small amount of dichroic dye molecules are typically dissolved in the liquid crystal, with the liquid crystal molecules acting as the "host" and the dye molecules acting as the "guest." In the absence of an applied electric field, the liquid crystal molecules have a certain orientation, and the dye molecules align along the direction of the liquid crystal molecules. Because the dye molecules have different absorption properties for light with different polarization directions, the polarization state and intensity of the incident light after passing through the liquid crystal layer will change, resulting in the display unit appearing in a specific color or grayscale.

[0048] When an electric field is applied to the guest-host liquid crystal layer, the orientation of the liquid crystal molecules changes. Due to the interaction between the dye molecules and the liquid crystal molecules, the orientation of the dye molecules also changes accordingly. This causes the dye molecules to change their light absorption properties, thereby changing the intensity and color of the emitted light. By controlling the magnitude and direction of the electric field, the orientation of the liquid crystal and dye molecules can be precisely controlled, thereby modulating the displayed color and grayscale to achieve the purpose of displaying images.

[0049] In the first to eighth specific examples, as Figures 2 to 9 As shown, the guest-host liquid crystal layer includes a dichroic dye and a polymeric liquid crystal, as well as other auxiliary materials and solvents.

[0050] Further, such as Figures 2 to 9 As shown, the guest-host liquid crystal layer can be obtained by coating a polyimide alignment layer, curing, UV irradiation alignment, low-temperature drying, coating a dichroic dye and polymerizable liquid crystal mixture, low-temperature solvent removal, and UV irradiation curing.

[0051] Further, such as Figures 2 to 9 As shown, the alignment direction of the guest-host liquid crystal layer is parallel to the film surface.

[0052] In the first to eighth specific examples, as Figures 2 to 9 As shown, the quarter wave plate layer can be a liquid crystal material.

[0053] Further, such as Figures 2 to 9 As shown, the quarter-wave plate layer can be obtained by coating a polyimide alignment layer, curing, UV irradiation alignment, low-temperature drying, coating a polymerizable liquid crystal, removing the solvent at low temperature, and UV irradiation curing.

[0054] Further, such as Figures 2 to 9As shown, the quarter-wave plate layer is a uniaxial liquid crystal, and its optical axis is parallel to the film surface.

[0055] In the first to eighth specific examples, as Figures 2 to 9 As shown, the alignment direction X of the liquid crystal molecules 303 of the guest-host liquid crystal layer 302 is located within the display surface of the display substrate 10 , that is, the alignment direction of the liquid crystal molecules of the guest-host liquid crystal layer is horizontally arranged.

[0056] Furthermore, in the first specific example to the eighth specific example, as Figures 2 to 9 As shown, guest-host liquid crystals use a dichroic dye with different visible light absorption along its long and short axes as a "guest" dissolved in an aligned liquid crystal "host." The dichroic dye aligns with the liquid crystal molecules in a "guest-follows-host" fashion, allowing the light transmittance to be controlled by manipulating the alignment of the liquid crystal molecules.

[0057] In the first to eighth specific examples, as Figures 2 to 9 As shown, by matching the transmittance of the color filter with the transmittance of the dichroic dye in the guest-host liquid crystal layer, a wide viewing angle display can be achieved while achieving the reflectivity and power consumption benefits of the COE structure.

[0058] like Figure 10 As shown, the light 1010 emitted by the display substrate 10 is incident on the guest-host liquid crystal layer in a first light propagation direction 1020, and the light 1010 emitted by the display substrate 10 has a first vibration direction 1011 and a second vibration direction 1012; the angle between the first light propagation direction 1020 and the short axis direction of the liquid crystal molecules 303 in the guest-host liquid crystal layer is 0°; the arrangement direction of the liquid crystal molecules 303 in the guest-host liquid crystal layer is horizontal; the arrangement direction of the liquid crystal molecules 303 in the guest-host liquid crystal layer is equal to the arrangement direction of the dichroic dye in the guest-host liquid crystal layer.

[0059] Further, such as Figure 10 As shown, when the light 1010 propagates along the short axis direction of the liquid crystal molecules 303, 50% of the vibration direction of the incident light 1010 is decomposed into the short axis direction 1031 of the liquid crystal molecules 303 and 50% is decomposed into the long axis direction 1032 of the liquid crystal molecules 303. The part of the light decomposed into the long axis direction 1032 of the liquid crystal molecules 303 will be absorbed, that is, the light decomposed into the light vibrating along the arrangement direction of the liquid crystal molecules 303 or the arrangement direction of the dichroic dye will be absorbed.

[0060] like Figure 11As shown, the light 1040 emitted by the display substrate 10 is incident on the guest-host liquid crystal layer in the second light propagation direction 1050, and the light 1050 emitted by the display substrate 10 has a third vibration direction 1041 and a fourth vibration direction 1042; there is a certain angle between the first light propagation direction 1050 and the short axis direction of the liquid crystal molecules 303 in the guest-host liquid crystal layer; the arrangement direction of the liquid crystal molecules 303 in the guest-host liquid crystal layer is horizontal; the arrangement direction of the liquid crystal molecules 303 in the guest-host liquid crystal layer is equal to the arrangement direction of the dichroic dye in the guest-host liquid crystal layer.

[0061] Further, such as Figure 11 As shown, when the incident angle of light 1040 is at a certain angle to the minor axis direction of the liquid crystal molecules 303, a portion of the light's vibration direction is decomposed along the minor axis direction 1051 of the liquid crystal molecules 303. This portion of light decomposed along the minor axis direction 1051 of the liquid crystal molecules 303 is completely transmitted, while 50% of the light decomposed along the major axis direction 1052 of the liquid crystal molecules 303 is absorbed. Therefore, the total transmittance at a certain angle is higher than the total transmittance at normal incidence.

[0062] like Figure 10 and Figure 11 As shown, the horizontally aligned liquid crystal molecules absorb the light incident at 0° the most; as the viewing angle increases, the transmittance of the guest-host liquid crystal layer also increases.

[0063] like Figure 12 As shown, in the related art, the light 1201 emitted by the OLED display substrate 1201 has a first polarization direction X1 and a second polarization direction Y1; the light 1201 forms a light 1204 after passing through the quarter-wave plate 1203, and the light 1204 includes the first polarization direction X1 and the second polarization direction Y1; the light 1204 forms a light 1206 after passing through the linear polarizer 1205, and the light 1206 only includes the second polarization direction Y1.

[0064] Further, such as Figure 12 As shown, the ideal total transmittance in the related art is 50%, and the transmittances in the two polarization directions are 100% and 0% respectively.

[0065] like Figure 13As shown, in this embodiment, the light 1302 emitted by the OLED display substrate 1301 has a first polarization direction X1 and a second polarization direction Y1; after the light 1302 passes through the COE structure 1303, it forms a light 1304, and the COE structure 1303 weakens the light intensity of the light 1304, and the light 1304 has the first polarization direction X1 and the second polarization direction Y1; after the light 1304 passes through the quarter-wave plate 1305, it forms a light 1306, and the light 1306 has the first polarization direction X1 and the second polarization direction Y1; after the light 1306 passes through the guest-host liquid crystal layer 1307, it forms a light 1308, and the light 1308 has the first polarization direction X1 and the second polarization direction Y1.

[0066] Further, such as Figure 13 As shown, the total transmittance of the guest-host liquid crystal layer is 75%, and the transmittances in the two polarization directions are 100% and 50%, respectively.

[0067] Further, such as Figure 13 As shown, the total transmittance of the guest-host liquid crystal layer is 75%, that is, the light that completely passes through the second polarization direction Y1 contributes 50%, and the light that partially passes through the first polarization direction X1 contributes 25%. The transmittance of the guest-host liquid crystal layer can be adjusted by adjusting the concentration of the dichroic dye.

[0068] Further, such as Figure 13 As shown, not all of the light 1302 emitted by the OLED display substrate 1301 is incident on the guest-host liquid crystal layer 1307 at an angle of 0°. Some of the light 1302 with an incident angle other than 0° will be decomposed in the direction of the short axis of the liquid crystal molecules in the guest-host liquid crystal layer and thus pass through the guest-host liquid crystal layer, thereby achieving a contribution of 25% of the light passing through the first polarization direction X1, that is, 50%X50%=25%.

[0069] like Figure 14 As shown, ambient light 1401 has a first polarization direction X1 and a second polarization direction Y1; ambient light 1401 forms light 1403 after passing through a linear polarizer 1402, and light 1403 has a second polarization direction Y1; light 1403 forms light 1405 after passing through a quarter-wave plate 1404, and light 1405 is left-handed circularly polarized light; light 1405 is reflected by an OLED display substrate 1406 to form light 1407, and light 1407 is right-handed circularly polarized light, that is, left-handed circularly polarized light is reflected by the OLED display substrate 1406 to form right-handed circularly polarized light; light 1407 forms light 1408 after passing through a quarter-wave plate 1404, and light 1408 has the first polarization direction X1. Light 1408 cannot pass through the linear polarizer 1402.

[0070] like Figure 15As shown, ambient light 1501 has a first polarization direction X1 and a second polarization direction Y1; ambient light 1501 forms light 1503 after passing through the guest-host liquid crystal layer 1502, and light 1503 has a first polarization direction X1 and a second polarization direction Y1, and the intensity of light 1503 in the first polarization direction X1 is weakened; light 1503 forms light 1505 after passing through the quarter-wave plate 1504, and light 1505 is left-handed elliptically polarized light; light 1505 forms light 1507 after passing through the COE structure 1506, and light 1507 is left-handed elliptically polarized light, and the intensity of light 1507 is weaker than that of light 1505; light 1507 forms light 1509 after being reflected by the OLED display substrate 1508, and light 1509 is right-handed elliptically polarized light. Circularly polarized light, that is, left-handed elliptically polarized light, is reflected by the OLED display substrate 1508 to form right-handed elliptically polarized light; light 1509 passes through the COE structure 1506 to form light 1510, which is right-handed elliptically polarized light, and the intensity of light 1510 is weaker than that of light 1509; light 1510 passes through the quarter-wave plate 1504 to form light 1511, which has a first polarization direction X1 and a second polarization direction Y1, and the intensity of light 1511 in the second polarization direction Y1 is weakened; light 1511 passes through the guest-host liquid crystal layer 1502 to form light 1512, which has a first polarization direction X1 and a second polarization direction Y1, and the intensity of light 1512 in the first polarization direction X1 is weakened.

[0071] Table 1 shows the parameter table of components of different schemes in Example 1. Table 1 includes the component parameters of Comparative Scheme 1, Comparative Scheme 2, Comparative Scheme 3 and Scheme 1 of the present invention.

[0072] Table 1 Parameters of components in different schemes in Example 1

[0073] Table 2 shows the simulation result data of different schemes in Example 1. Table 2 includes the simulation result data of Comparative Scheme 1, Comparative Scheme 2, Comparative Scheme 3 and Scheme 1 of the present invention.

[0074] Table 2 Simulation results of different schemes in Example 1

[0075] According to Tables 1 and 2, Scheme 1 of the present invention uses a filter with a thickness of 2.4 μm and a guest-host liquid crystal layer with a transmittance of 80%, while Comparative Scheme 3 uses only a filter with a thickness of 3.5 μm. The reflectivity of Scheme 1 of the present invention is 6.09%, and the reflectivity of Comparative Scheme 3 is 6.13%. It can be seen that the reflectivity level of Scheme 1 of the present invention is basically the same as the reflectivity level of Comparative Scheme 3; the red light transmittance of Scheme 1 of the present invention is 58.5%, and the red light transmittance of Comparative Scheme 3 is 65.0%. The green light transmittance of Scheme 1 of the present invention is 42.3%, and the green light transmittance of Comparative Scheme 3 is 40.8%. The blue light transmittance of Scheme 1 of the present invention is 55.6%, and the blue light transmittance of Comparative Scheme 3 is 60.6%. It can be seen that the transmittance of red, green, and blue light of Scheme 1 of the present invention is basically the same as the transmittance of red, green, and blue light of Comparative Scheme 3.

[0076] It can be seen that the light output states of the two display panel structures of Solution 1 of the present invention and Comparative Solution 3 at the normal viewing angle are basically the same, but the COE structure in Comparative Solution 3 absorbs more light at a large viewing angle, while the COE+guest-host liquid crystal layer structure in Solution 1 of the present invention absorbs less light at a large viewing angle. Therefore, the display panel of the present invention has a viewing angle characteristic that is better than the viewing angle characteristic of the display panel in the related art on the basis that the power consumption benefit and reflectivity of the display panel of the present invention are respectively the same as those of the display panel in the related art.

[0077] Table 3 shows the parameter table of components of different schemes in Example 2. Table 3 includes the component parameters of Comparative Scheme 1, Comparative Scheme 2, Comparative Scheme 4, Scheme 2 of the present invention, and Scheme 3 of the present invention.

[0078] Table 3 Parameters of components in different schemes in Example 2

[0079] Table 4 shows the simulation result data of different schemes in Example 2. Table 4 includes the simulation result data of comparative scheme 1, comparative scheme 2, comparative scheme 4, scheme 2 of the present invention and scheme 3 of the present invention.

[0080] Table 4 Simulation results of different schemes in Example 2

[0081] According to Table 3 and Table 3, a filter with a thickness of 2.4 μm and a guest-host liquid crystal layer with a transmittance of 90% are used in Scheme 2 of the present invention, a filter with a thickness of 2.0 μm and a guest-host liquid crystal layer with a transmittance of 80% are used in Scheme 3 of the present invention, and a filter with a thickness of 3.0 μm is used in Comparative Scheme 4. The reflectivity of Scheme 2 of the present invention is 6.43%, the transmittance of Scheme 3 of the present invention is 6.33%, and the transmittance of Comparative Scheme 4 is 6.37%. It can be seen that the reflectivity of Scheme 2 of the present invention or the reflectivity of Scheme 3 of the present invention is very close to the reflectivity of Comparative Scheme 4. Moreover, the red light transmittance of Scheme 2 of the present invention is 65.9%, the red light transmittance of Scheme 3 of the present invention is 61.0%, and the red light transmittance of Comparative Scheme 4 is 68.6%; the green light transmittance of Scheme 2 of the present invention is 47.6%, the green light transmittance of Scheme 3 of the present invention is 46.6%, and the green light transmittance of Comparative Scheme 4 is 45.8%; the blue light transmittance of Scheme 2 of the present invention is 62.6%, the blue light transmittance of Scheme 3 of the present invention is 58.5%, and the blue light transmittance of Comparative Scheme 4 is 64.5%. It can be seen that the red, green, and blue light transmittances of Scheme 2 of the present invention or the red, green, and blue light transmittances of Scheme 3 of the present invention are very close to those of Comparative Scheme 4.

[0082] The display panel of this embodiment utilizes two light-absorbing structures, namely a color filter and a guest-host liquid crystal layer. On the one hand, this can reduce the thickness of the color filter and reduce the light absorption of the color filter at a wide viewing angle. On the other hand, the transmittance of the color filter layer and the transmittance of the guest-host liquid crystal layer can be matched by utilizing the characteristic of the guest-host liquid crystal layer that reduces light absorption at a wide viewing angle. The combination of the two can achieve a display effect with a wide viewing angle of the display panel.

[0083] In a possible implementation, the light regulation layer is located on a side of the color filter layer away from the display substrate.

[0084] In the first specific example, the third specific example, the fourth specific example, the fifth specific example, the seventh specific example, and the eighth specific example, as Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 and Figure 9 As shown, the light regulating layer 30 is located on the side of the color filter layer 20 away from the display substrate 10 .

[0085] In this embodiment, the light regulating layer is disposed on the side of the color filter layer away from the display substrate, thereby effectively improving the viewing angle characteristics of the display panel.

[0086] In another possible implementation, the color filter layer is located on a side of the light regulating layer away from the display substrate.

[0087] In the second specific example and the sixth specific example, as Figure 3 and Figure 7 As shown, the color filter layer 20 is located on the side of the light regulating layer 30 away from the display substrate 10 .

[0088] In this embodiment, the color filter layer is disposed on the side of the light regulating layer away from the display substrate, thereby realizing a design method of the display panel.

[0089] In a possible implementation, the light regulating layer further includes a first protective layer.

[0090] In the third specific example, the fourth specific example, the seventh specific example, and the eighth specific example, as Figure 4 、 Figure 5 、 Figure 8 and Figure 9 As shown, the light regulating layer 30 further includes a first protective layer 306 .

[0091] Further, such as Figure 4 、 Figure 5 、 Figure 8 and Figure 9 As shown, the guest-host liquid crystal layer and the quarter-wave plate are attached to the top of the module structure, that is, the top of the module materials, by external attachment.

[0092] This embodiment can achieve anti-scratch, anti-fingerprint and other functions by providing a first protective layer in the light regulation layer.

[0093] In a possible implementation, the light regulating layer further includes a first alignment layer for configuring the alignment direction of liquid crystal molecules in the guest-host liquid crystal layer.

[0094] In the first to eighth specific examples, as Figures 2 to 9 As shown, the light regulating layer 30 further includes a first alignment layer 304 for configuring the alignment direction of the liquid crystal molecules 303 of the guest-host liquid crystal layer 302 .

[0095] Furthermore, in the first specific example to the eighth specific example, as Figures 2 to 9 As shown, the quarter wave plate 301 is a quarter wave plate liquid crystal layer.

[0096] Furthermore, in the first specific example to the eighth specific example, as Figures 2 to 9 As shown, the light regulating layer 30 further includes a second alignment layer 305 for configuring the alignment direction of liquid crystal molecules of the quarter-wave plate liquid crystal layer.

[0097] Furthermore, in the guest-host liquid crystal layer and the quarter-wave plate liquid crystal layer, the directions of the liquid crystal molecules are fixed by the alignment layer, and no electric field needs to be applied to modulate the directions of the liquid crystal molecules.

[0098] Furthermore, in the first specific example to the eighth specific example, as Figures 2 to 9 As shown, the material of the first alignment layer 304 is polyimide (PI).

[0099] Furthermore, in the first specific example to the eighth specific example, as Figures 2 to 9 As shown, the material of the second alignment layer 305 is polyimide (PI).

[0100] In this embodiment, the light control layer further includes a first alignment layer for configuring the alignment direction of liquid crystal molecules in the guest-host liquid crystal layer, so that the alignment direction of liquid crystal molecules in the guest-host liquid crystal layer is located within the display surface of the display substrate.

[0101] In a possible implementation, the transmittance of the guest-host liquid crystal layer is configured to be greater than 75%.

[0102] In the first to eighth specific examples, as Figures 2 to 9 As shown, the transmittance of the guest-host liquid crystal layer 302 is configured to be greater than 75%.

[0103] Furthermore, the transmittance of the guest-host liquid crystal layer is configured to be 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, etc.

[0104] In the first to eighth specific examples, as Figures 2 to 9 As shown, the transmittance of the first filter 2021 is greater than 50%, the transmittance of the second filter 2022 is greater than 50%, and the transmittance of the third filter 2023 is greater than 50%.

[0105] In the first to eighth specific examples, as Figures 2 to 9 As shown, the overall transmittance of the display panel is greater than 45%.

[0106] In this embodiment, by setting the transmittance of the guest-host liquid crystal layer to be greater than 75%, the property of reducing light absorption at a wide viewing angle of the guest-host liquid crystal layer can be improved while ensuring the reflectivity and transmittance.

[0107] In a possible implementation, the thickness of the color filter layer is set to be less than 3 μm.

[0108] In the first to eighth specific examples, as Figures 2 to 9 As shown, the thickness of the color filter layer 30 is set to be less than 3 μm.

[0109] Furthermore, the thickness of the color filter layer is set to 2.9μm, 2.8μm, 2.7μm, 2.6μm, 2.5μm, 2.4μm, 2.3μm, 2.2μm, 2.1μm, 2.0μm, 1.9μm, 1.8μm, 1.7μm, 1.6μm, 1.5μm, etc.

[0110] In this embodiment, by setting the thickness of the color filter layer to be less than 3 μm, the thickness of the color filter can be reduced, thereby reducing the light absorption of the color filter at a wide viewing angle.

[0111] In a possible implementation, the light regulating layer further includes a half-wave plate located between the quarter-wave plate and the guest-host liquid crystal layer.

[0112] In the fifth to eighth specific examples, as Figures 6 to 9 As shown, the light regulating layer 30 further includes a half wave plate 308 located between the quarter wave plate 301 and the guest-host liquid crystal layer 302 .

[0113] Further, such as Figures 6 to 9 As shown, the quarter wave plate 301 is located on the side of the guest-host liquid crystal layer 302 close to the display substrate 10. The quarter wave plate can also be a quarter wave plate combined with a half wave plate or a quarter wave plate combined with other structures that convert linearly polarized light into circularly polarized light.

[0114] Further, such as Figures 6 to 9 As shown, the light control layer 30 also includes a half-wave plate 308 disposed between the quarter-wave plate 301 and the guest-host liquid crystal layer 302. Ambient light (natural light) covers a wide wavelength range, while conventional quarter-wave plates generally only cover a single wavelength. To achieve ideal broadband compensation, this implementation utilizes a half-wave plate. For example, it is stacked in a certain direction with a quarter-wave plate with a narrow wavelength distribution, thereby achieving broadband coverage of the visible light band.

[0115] In a possible implementation, the absorption spectrum of the dichroic dye molecules of the guest-host liquid crystal layer corresponds to the visible light wavelength range.

[0116] In the first to eighth specific examples, as Figures 2 to 9 As shown, the absorption spectrum of the dichroic dye molecules in the guest-host liquid crystal layer 302 corresponds to the visible light wavelength range.

[0117] The absorption spectrum of the dichroic dye molecules in the guest-host liquid crystal layer of this embodiment corresponds to the visible light wavelength range, and has broad application prospects.

[0118] In a possible implementation, the display substrate is an OLED display substrate.

[0119] In the first to eighth specific examples, as Figures 2 to 9 As shown, the display substrate 10 is an OLED display substrate.

[0120] In this embodiment, the display substrate is configured as an OLED display substrate, thereby improving the practicality of the display panel.

[0121] Another embodiment of the present invention provides a display device including the display panel according to one embodiment of the present invention.

[0122] Specifically, the display device is a touch display device, which may include any device or product with a display function. For example, the touch display device may be a smart phone, a mobile phone, an e-book reader, a desktop computer (PC), a laptop PC, a netbook PC, a personal digital assistant (PDA), a portable multimedia player (PMP), a digital audio player, a mobile medical device, a camera, a wearable device (such as a head-mounted device, electronic clothing, an electronic bracelet, an electronic necklace, an electronic accessory, or a smart watch), a television, etc.

[0123] 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 those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to enumerate all the implementation methods here. Any obvious changes or modifications derived from the technical solution of the present disclosure are still within the scope of protection of the present disclosure.

Claims

1. A display panel, characterized in that: The invention comprises a display substrate and a color filter layer and a light regulation layer located on the light-emitting side of the display substrate. The light regulation layer comprises a quarter-wave plate and a guest-host liquid crystal layer located on the side of the quarter-wave plate away from the display substrate. The liquid crystal molecules of the guest-host liquid crystal layer are oriented within the display surface of the display substrate.

2. The display panel according to claim 1, wherein: The light regulating layer is located on a side of the color filter layer away from the display substrate.

3. The display panel according to claim 2, wherein: The light regulating layer further includes a first protective layer.

4. The display panel according to any one of claims 1 to 3, wherein: The light regulating layer further includes a first alignment layer for configuring the alignment direction of liquid crystal molecules in the guest-host liquid crystal layer.

5. The display panel according to claim 1, wherein: The transmittance of the guest-host liquid crystal layer is configured to be greater than 75%.

6. The display panel according to claim 1, wherein: The thickness of the color filter layer is set to be less than 3 μm.

7. The display panel according to claim 1, wherein: The light regulating layer further includes a half wave plate located between the quarter wave plate and the guest-host liquid crystal layer.

8. The display panel according to claim 1, wherein: The absorption spectrum of the dichroic dye molecules in the guest-host liquid crystal layer corresponds to the visible light wavelength range.

9. The display panel according to claim 1, wherein: The display substrate is an OLED display substrate.

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

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