Display panel

Abstract

The utility model provides a display panel, a limiting layer of the display panel is provided with a groove at a position corresponding to a light source, a limiting part is formed corresponding to a first gap between adjacent light sources, a color conversion unit is arranged in the groove, a blazed grating is arranged on the groove wall of the groove, and the blazed grating is located between the limiting part and the color conversion unit. A second gap is formed between the color conversion unit and the adjacent blazed grating, and the emergent light of the light source is converted by the color conversion unit to directly form display light, or is converted by the color conversion unit, is reflected by the blazed grating and then is emitted from the second gap to form the display light. Therefore, light converted by the color conversion unit is directly emitted from the second gap after passing through the blazed grating and does not pass through the color conversion unit again, light loss caused by multiple times of reflection by the metal coating and scattering and re-absorption by the color conversion unit can be reduced, and the brightness can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially relates to a display panel. BACKGROUND

[0002] Micro Light Emitting Diode (Micro LED) is considered as the ultimate display technology of future display because of its super high contrast, high color gamut, high life, high response speed and other advantages. The present Micro LED technology is not mature, especially full color technology. Quantum dots (QD) full color has many advantages compared with vertical stack full color technology. For example, simple process, relatively mature technology, low temperature and current density dependence. In the existing quantum dot full color technology, quantum dots are arranged in the area surrounded by the bank. At the same time, in order to increase the light extraction, metal plating film is arranged between the bank and the quantum dots to reflect the light to a certain extent. However, multiple reflections of the metal plating film and scattering and reabsorption of the quantum dots will cause light loss, resulting in brightness bottleneck. SUMMARY

[0003] The utility model provides a kind of display panel, to alleviate the technical problem that multiple reflections of the metal plating film and scattering and reabsorption of the quantum dots will cause light loss in the existing quantum dot full color technology, resulting in brightness bottleneck.

[0004] To solve the above problems, the technical scheme provided by the utility model is as follows:

[0005] The utility model embodiment provides a kind of display panel, it includes:

[0006] Drive substrate;

[0007] Light source, array is set on the drive substrate, and there is first gap between adjacent light source;

[0008] Limit layer, it is set in the side of the light source away from the drive substrate, the limit layer is provided with recess in the position corresponding to the light source, and the limit layer includes the limit part that is set with the first gap alignment, and the limit part surrounds the recess;

[0009] Color conversion unit, it is set in at least part recess;

[0010] The groove wall is provided with a blazed grating, the blazed grating is located between the limiting part and the color conversion unit, the color conversion unit and the adjacent blazed grating have a second gap, and the light emitted by the light source is directly converted by the color conversion unit to form display light or is converted by the color conversion unit and then reflected by the blazed grating to form display light from the second gap.

[0011] In the display panel provided in the embodiment of the utility model, the light emitted by the light source, which has not been converted by the color conversion unit, is reflected by the blazed grating and then incident on the color conversion unit again.

[0012] In the display panel provided in the embodiment of the utility model, the display panel further comprises a light adjusting unit arranged in the second gap, the light adjusting unit covers at least the blazed grating, and the refractive index of the light adjusting unit is greater than the refractive index of the limiting part.

[0013] In the display panel provided in the embodiment of the utility model, the surface of the groove wall is a first inclined surface, the color conversion unit comprises a second inclined surface arranged face to face with the first inclined surface, and the inclined directions of the first inclined surface and the second inclined surface arranged face to face are the same relative to a parallel plane of the plane where the driving substrate is located.

[0014] In the display panel provided in the embodiment of the utility model, the first inclined surface and the surface of the limiting part close to one side of the driving substrate form a first included angle, the second inclined surface and the surface of the color conversion unit away from one side of the driving substrate form a second included angle, the first included angle is equal to the second included angle, and the ranges of the first included angle and the second included angle are both 60-70 degrees.

[0015] In the display panel provided in the embodiment of the utility model, the first inclined surface and the surface of the limiting part close to one side of the driving substrate form a first included angle, the second inclined surface and the surface of the color conversion unit away from one side of the driving substrate form a second included angle, the first included angle is less than the second included angle, the range of the first included angle is 60-70 degrees, and the range of the second included angle is 70-90 degrees.

[0016] In the display panel provided in the embodiment of the utility model, the blazed grating comprises a plurality of groove structures formed on the groove wall, each groove structure has a triangular cross section in a plane perpendicular to the groove wall, and two adjacent groove structures are connected by sharing a vertex.

[0017] In the display panel provided in the embodiment of the utility model, the color conversion unit comprises a red quantum dot unit and a green quantum dot unit, and the red quantum dot unit and the green quantum dot unit are located in different grooves;

[0018] The blazed grating corresponding to the red quantum dot unit has a first grating width and a first blaze angle, and the blazed grating corresponding to the green quantum dot unit has a second grating width and a second blaze angle, the first grating width is greater than the second grating width, and / or the first blaze angle is greater than the second blaze angle.

[0019] The first grating width and the second grating width refer to the width of the groove structure in the first direction in the corresponding blazed grating, and the first direction is the arrangement direction of the groove structure.

[0020] In the display panel provided in the embodiment of the utility model, the display panel further comprises a plurality of sub-pixels arranged one-to-one with the grooves, each of the sub-pixels comprises one of the light sources, the plurality of sub-pixels comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel comprises the red quantum dot unit and the light source corresponding to the red quantum dot unit, and the second sub-pixel comprises the green quantum dot unit and the light source corresponding to the green quantum dot unit.

[0021] The limiting part forms a blazed grating in the groove corresponding to the third sub-pixel, the blazed grating corresponding to the third sub-pixel has a third grating width and a third blaze angle, the third grating width is smaller than the second grating width, and / or the third blaze angle is smaller than the second blaze angle.

[0022] In the display panel provided in the embodiment of the utility model, the display panel further comprises a color filter unit arranged on the side of the color conversion unit away from the driving substrate, and the color filter unit comprises a red filter unit arranged in alignment with the red quantum dot unit and a green filter unit arranged in alignment with the green quantum dot unit.

[0023] The utility model discloses a display panel, the recess is provided with the limiting layer in the position of corresponding light source, and the limiting part is formed to the first gap between the corresponding adjacent light source, and the color conversion unit is arranged in the recess, the groove wall of recess is equipped with the blazed grating, and the blazed grating is located between the limiting part and the color conversion unit, and the second gap is formed between the color conversion unit and the adjacent blazed grating, the emergent light of light source is directly formed display light after being converted by the color conversion unit, or the emergent light of light source is formed display light after being converted by the color conversion unit and being reflected by the blazed grating, so that the light that is converted by the color conversion unit directly emerges from the second gap after passing through the blazed grating, and will not pass through the color conversion unit again, thereby the light loss caused by the multiple reflection of metal coating film and the scattering and resorption of color conversion unit can be reduced, and the brightness can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor according to these drawings.

[0025] Figure 1 Partially section structure schematic diagram of the display panel is exemplified.

[0026] Figure 2 For Figure 1 Local light path schematic diagram of the display panel in the embodiment of the utility model.

[0027] Figure 3 Partially section structure schematic diagram of the display panel provided by the utility model embodiment.

[0028] Figure 4 For Figure 3 Local light path schematic diagram of the display panel in the embodiment of the utility model.

[0029] Figure 5 For Figure 3 Partially detail structure schematic diagram of the blazed grating in the embodiment of the utility model.

[0030] Figure 6 Another partially section structure schematic diagram of the display panel provided by the utility model embodiment.

[0031] Figure 7 Another partially section structure schematic diagram of the display panel provided by the utility model embodiment. DETAILED DESCRIPTION

[0032] The following description of the embodiments refers to the accompanying drawings, which are used to illustrate specific embodiments of the present application. The terms of direction mentioned in the present application, such as [up], [down], [front], [back], [left], [right], [inward], [outward], [side] and the like, are only used in reference to the direction of the accompanying drawings. Therefore, the terms of direction are used to illustrate and understand the present application, but not to limit the present application. In the drawings, similar elements are denoted by the same reference numerals. In the drawings, the thickness of some layers and regions is exaggerated for clarity and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily shown, but the present application is not limited thereto.

[0033] Please refer to Figure 1 and Figure 2 The display panel includes a driving substrate 10', a light source 20' disposed on the driving substrate 10', a limiting layer disposed on a side of the light source 20' away from the driving substrate 10', and a color conversion unit 40' disposed on the limiting layer. The light source 20' has a first gap between adjacent light sources 20'. The limiting layer is provided with a limiting portion 30' corresponding to the first gap, and a groove is formed in a position corresponding to the light source 20'. The color conversion unit 40' is located in the groove and corresponds to the light source 20'. The color conversion unit 40' is used to convert the light of the light source 20' into light corresponding to the color of the color conversion unit 40'. For example, the color conversion unit 40' includes red quantum dots, and the blue light emitted by the light source 20' is converted into red light after passing through the color conversion unit 40' including red quantum dots.

[0034] The inventors found in research that, in order to improve the light extraction efficiency, a metal coating film 50' can be provided on the side wall of the limiting portion 30' close to the color conversion unit 40'. The metal coating film 50' can act as a reflecting element to reflect the light A' converted by the color conversion unit 40' and directed towards the limiting portion 30', and reflect the light directed towards the limiting portion 30' back to the color conversion unit 40', thereby avoiding the light being absorbed by the limiting portion 30' or overflowing from the limiting portion 30', so as to improve the light extraction efficiency.

[0035] However, the inventors found that although the metal coating film 50' can improve the light extraction efficiency, the light will be lost after multiple reflections on the metal coating film 50' in the limiting portion 30'. Moreover, the light reflected back to the color conversion unit 40' by the metal coating film 50' also has the risk of being reabsorbed by the quantum dots in the color conversion unit 40', and in addition, the quantum dots in the color conversion unit 40' will also scatter part of the light, resulting in a large light loss, thereby causing a bottleneck in the brightness improvement of the display panel.

[0036] In addition, due to the quantum dot material film thickness limitation in the color conversion unit 40', the display panel has a blue light leakage problem. Therefore, a color filter unit 70' can be added in the light emitting direction of the color conversion unit 40' to filter out blue light to ensure the color gamut. However, the filtering ability of the organic material of the color filter unit 70' is limited, which will further aggravate the brightness bottleneck of the display panel.

[0037] Therefore, the inventors of the present application have made continuous explorations and proposed a display panel capable of realizing high brightness to improve the brightness bottleneck problem.

[0038] Referring to Figures 3 to 5 , Figure 3 A partial cross-sectional structure schematic diagram of the display panel provided by the embodiment of the present application is shown in FIG. 1. Figure 4 A Figure 3 A local light path schematic diagram of the display panel in FIG. 1 is shown in FIG. 2. Figure 5 A Figure 3 A partial detail structure schematic diagram of the blazed grating in FIG. 2 is shown in FIG. 3. Figure 3 The display panel 100 includes a driving substrate 10 and light sources 20 arranged in an array on the driving substrate 10. The driving substrate 10 can be PCB-based or glass-based. The driving substrate 10 can include a substrate and a driving circuit arranged on the substrate, and the driving circuit is used to drive the light sources 20 to emit light. The driving circuit can include a plurality of thin film transistors.

[0039] The light sources 20 are arranged at intervals on the driving substrate 10, such as a plurality of light sources 20 arranged in an array on the driving substrate 10. The adjacent light sources 20 have a first gap therebetween. The light sources 20 include micro light emitting diodes (Micro LED) and the like, such as the light sources 20 being micro light emitting diodes emitting blue light.

[0040] The display panel 100 further includes a limiting layer arranged on a side of the light sources 20 away from the driving substrate 10. The limiting layer is provided with a limiting portion 30 at a position corresponding to the first gap, and is formed with a groove 31 at a position corresponding to the light sources 20. The limiting portion 30 surrounds the groove 31. The groove 31 is arranged one-to-one corresponding to the light sources 20.

[0041] Optionally, the display panel 100 further comprises a protective layer 21 covering the light source 20 and the driving substrate 10 exposed by the first gap, so as to protect the light source 20 from water and oxygen. The protective layer 21 can be integrally arranged with the limiting layer, for example, a covering layer with a large thickness can be arranged on the light source 20, the covering layer is etched to form the recess 31 corresponding to the light source 20 and the limiting portion 30 corresponding to the first gap, and the covering layer not etched under the recess 31 serves as the protective layer 21. At this time, the limiting portion 30 and the protective layer 21 are made of the same material, for example, the limiting portion 30 and the protective layer 21 are both made of silicon oxide film or silicon nitride film.

[0042] With reference to Figure 3 and Figure 4 , the display panel 100 further comprises a color conversion unit 40 arranged in at least part of the recess 31, and the color conversion unit 40 corresponds to the light source 20. The groove wall of the recess 31 is provided with a blazed grating 50, and the blazed grating 50 is located between the limiting portion 30 and the color conversion unit 40, that is, the limiting portion 30 and the color conversion unit 40 form the blazed grating 50 in the array direction of the limiting portion 30, and optionally, the surface of the limiting portion 30 facing the color conversion unit 40 is provided with the blazed grating 50, and the color conversion unit 40 and the adjacent blazed grating 50 have a second gap. Wherein, the surface of the limiting portion 30 facing the color conversion unit 40 is the groove wall of the recess 31, the groove bottom of the recess 31 is close to the light source 20 and is arranged in alignment with the light source 20, and the groove wall surrounds the groove bottom to form the recess. In addition, the alignment arrangement in the utility model refers to the positional relationship of two structures in space, specifically, refers to the positional relationship in the thickness direction of the display panel 100 or the direction perpendicular to the thickness direction of the display panel 100.

[0043] The light emitted by the light source 20 forms display light directly after passing through the color conversion unit 40 or forms display light after passing through the color conversion unit 40 and the blazed grating 50 and being emitted from the second gap, so that the light A converted by the color conversion unit 40 is emitted from the second gap after passing through the blazed grating 50. That is, the light emitted by the light source 20 forms display light directly after being converted by the color conversion unit 40 or forms display light after being converted by the color conversion unit 40 and being reflected by the blazed grating 50 and then being emitted from the second gap. Here, the display light refers to the light contributing to the display of the display panel 100. In addition, the color conversion unit 40 can absorb the light emitted by the light source 20 and convert the absorbed light into light of a specific wavelength, and the absorption wavelength of the color conversion unit 40 matches the wavelength of the light emitted by the light source 20.

[0044] In other words, the light A converted by the color conversion unit 40 is emitted directly from the second gap after passing through the blazed grating 50 without passing through the color conversion unit 40 again, so that the light loss caused by multiple reflections of the metal coating and scattering and reabsorption of the color conversion unit 40 can be reduced, and the brightness can be improved. The light B not converted by the color conversion unit 40 is incident into the color conversion unit 40 again after passing through the blazed grating 50, so that the utilization rate of the light can be improved, and the brightness can be further improved. Here, the light B not converted by the color conversion unit 40 is the blue light emitted by the light source 20. That is, the target light is emitted directly after being modulated by the blazed grating 50, and the blue light is selected by wavelength and is deflected to return to the color conversion unit 40, so that the efficiency is improved and the brightness is improved.

[0045] In some embodiments, the display panel 100 further includes a dimming unit 60 arranged in the second gap, and the dimming unit 60 covers at least the blazed grating 50, for example, the dimming unit 60 is filled in the first gap, so that the dimming unit 60 abuts against the blazed grating 50 and the color conversion unit 40, that is, the dimming unit 60 covers the blazed grating 50 and the color conversion unit 40.

[0046] The refractive index of the light adjusting unit 60 is greater than the refractive index of the limiting portion 30, so as to improve the light extraction efficiency. Optionally, the light adjusting unit 60 is a high refractive index silicon oxide film, and the limiting portion 30 is a low refractive index silicon nitride film. For example, the refractive index of the light adjusting unit 60 is 2.2-2.7, and the refractive index of the limiting portion 30 is 1.38-2.2. In other embodiments, the light adjusting unit 60 can also be selected from a high refractive index titanium dioxide (TiO2) film, and the limiting portion 30 can also be selected from a low refractive index magnesium fluoride (MgF2) film.

[0047] In some embodiments, continuing to refer to Figure 3 and Figure 4 , the limiting portion 30 comprises a first inclined surface 301, and the color conversion unit 40 comprises a second inclined surface 401 arranged opposite to the first inclined surface 301. The inclined directions of the first inclined surface 301 and the second inclined surface 401 are the same relative to the plane where the driving substrate 10 is located, so that the area of the upper surface of the color conversion unit 40 is greater than the area of the lower surface of the color conversion unit 40, so as to improve the conversion efficiency of the light emitted by the light source 20 in the color conversion unit 40.

[0048] The first inclined surface 301 of the limiting portion 30 is the surface of the limiting portion 30 on which the blazed grating 50 is formed. The upper surface of the color conversion unit 40 refers to the surface of the color conversion unit 40 away from the light source 20, and the lower surface of the color conversion unit 40 refers to the surface of the color conversion unit 40 close to the light source 20. The orthographic projection of the light source 20 on the color conversion unit 40 is located in the lower surface of the color conversion unit 40, so that the light emitted by the light source 20 can pass through the color conversion unit 40.

[0049] The included angle between the first inclined surface 301 and the surface 302 of the limiting portion 30 close to the driving substrate 10 is a first included angle a1, and the surface 302 of the limiting portion 30 close to the driving substrate 10 is the lower surface of the limiting portion 30. The included angle between the second inclined surface 401 and the surface 402 of the color conversion unit 40 away from the driving substrate 10 is a second included angle a2, and the surface 402 of the color conversion unit 40 away from the driving substrate 10 is the upper surface of the color conversion unit 40. The first included angle a1 is equal to the second included angle a2, and the range of the first included angle a1 and the second included angle a2 is 60-70 degrees, so as to improve the light extraction efficiency and enhance the brightness.

[0050] Referring to Figure 4 and Figure 5The blazed grating 50 includes a plurality of groove structures 51 formed on the surface of the defined part 30, that is, the plurality of groove structures 51 are formed on the first inclined surface 301, and adjacent two groove structures 51 are connected to each other, and each groove structure 51 has a triangular cross section in a plane perpendicular to the surface.

[0051] The blazed grating 50 is different from a common grating, and can separately modulate single-slit diffraction and slit interference, transfer and concentrate light energy to a required certain order spectrum, and realize blazed light of the order spectrum. Therefore, the blazed grating 50 has a high conversion efficiency, for example, a conversion efficiency greater than 90%. A single-slit diffraction main maximum direction is a reflection direction of incident light, and if an optical path difference of adjacent two beams in the direction satisfies a grating equation m order, single-slit diffraction 0 order and slit interference m order can be overlapped.

[0052] In the formula, 2dsinθ = mλ determines a main maximum of each order interference. In the formula, m is an interference order, d is a grating width of the blazed grating 50, θ is a blazed angle of the blazed grating 50, and λ is a wavelength of incident light incident to the blazed grating 50. The grating width of the blazed grating 50 refers to a width of the groove structure 51 in the blazed grating 50 in an arrangement direction thereof, that is, a width of each groove structure 51. The blazed angle of the blazed grating 50 refers to an included angle between a normal line n1 of a plane where the blazed grating 50 is located and a normal line n2 of a reflection surface of the blazed grating 50, that is, an included angle between a bottom surface of each groove structure 51 in the blazed grating 50 and a reflection surface of the groove structure 51. If m, λ, d and an incident angle of incident light are known, the blazed angle θ can be determined. At this time, light reflected after passing through the blazed grating 50 is very strong, like dazzling light reflected by a smooth surface of an object, so that brightness is improved.

[0053] The blazed grating 50 is formed by etching a blazed angle on the basis of a grating. A width ratio and a groove depth are main parameters reflecting a groove shape of a photoresist mask, and many factors affect the groove shape of the photoresist mask, such as baking time and temperature, glue spinning speed, exposure time, exposure light intensity, wavelength and contrast, stability of interference fringes, developing time and temperature, and concentration of a developing solution.

[0054] Continuing to refer to Figure 3The color conversion unit 40 includes a red quantum dot unit 41 and a green quantum dot unit 42. The red quantum dot unit 41 and the green quantum dot unit 42 are located in different grooves 31. For example, the grooves 31 include a first groove 31-1, a second groove 31-2, and a third groove 31-3 arranged adjacently. The red quantum dot unit 41 is located in the first groove 31-1, the green quantum dot unit 42 is located in the second groove 31-2, and the color conversion unit 40 is not located in the third groove 31-3. The three adjacent grooves 31 correspond to the three light sources 20. Specifically, the first groove 31-1 corresponds to the first light source 20-1, the second groove 31-2 corresponds to the first light source 20-2, and the third groove 31-3 corresponds to the third light source 20-3.

[0055] The blazed grating 50-1 corresponding to the red quantum dot unit 41 has a first grating width and a first blaze angle, and the blazed grating 50-2 corresponding to the green quantum dot unit 42 has a second grating width and a second blaze angle. The first grating width is greater than the second grating width, and / or the first blaze angle is greater than the second blaze angle. That is, by adjusting parameters such as the blaze angle θ, the reflection states of the blazed gratings 50 corresponding to the red quantum dot unit 41 and the green quantum dot unit 42 are differentiated, so that the sidewall light loss of the limiting part 30 is significantly reduced, thereby improving the brightness. The first grating width and the second grating width refer to the width of the groove structure 51 in the corresponding blazed grating 50 in a first direction, where the first direction is the arrangement direction of the groove structure 51.

[0056] The display panel 100 also includes a plurality of sub-pixels that are disposed one-to-one with the recess 31. Each sub-pixel includes a light source 20. The plurality of sub-pixels include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. The first sub-pixel SP1 includes the red quantum dot unit 41 and the light source 20 corresponding to the red quantum dot unit 41 (i.e., the first light source 20-1). The second sub-pixel SP2 includes the green quantum dot unit 42 and the light source 20 corresponding to the green quantum dot unit 42 (i.e., the second light source 20-2).

[0057] The limiting portion 30 has a blazed grating 50-3 formed in the groove 31 corresponding to the third sub-pixel SP3. The blazed grating 50-3 corresponding to the third sub-pixel SP3 has a third grating width and a third blaze angle. The third grating width is smaller than the second grating width, and / or the third blaze angle is smaller than the second blaze angle. That is, by adjusting parameters such as the blaze angle θ, the reflection states of the blazed gratings 50 corresponding to the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 are differentiated, so as to further significantly reduce the sidewall light loss of the limiting portion 30 and further improve the brightness.

[0058] In some embodiments, refer to Figure 6 , Figure 6 This is a schematic cross-sectional view of another portion of the display panel 100 provided in an embodiment of the present invention. Figure 3 The difference in the example display panel 100 is that the angle between the first inclined surface 301 and the surface of the limiting portion 30 near the driving substrate 10 is a first angle α1, and the angle between the second inclined surface 401 and the surface of the color conversion unit 40 away from the driving substrate 10 is a second angle α2. The first angle α1 is smaller than the second angle α2. The range of the first angle α1 is 60-70 degrees, and the range of the second angle α2 is 70-90 degrees. This increases the size of the first gap to allow more space for direct light output, further improving the conversion efficiency of the radiant grating 50, thereby further enhancing the brightness of the display panel 100. Other descriptions are provided in the above embodiment and will not be repeated here.

[0059] In some embodiments, refer to Figure 7 , Figure 7 This is a partial cross-sectional structural diagram of the display panel 100 provided in another embodiment of the present utility model. Figure 3 The difference in the example display panel 100 is that it further includes a color filter unit 70 disposed on the side of the color conversion unit 40 away from the driving substrate 10. The color filter unit 70 includes a red filter unit 71 disposed opposite to the red quantum dot unit 41, and a green filter unit 72 disposed opposite to the green quantum dot unit 42, to further filter blue light and improve the color gamut of the display panel 100. Other descriptions are provided in the above embodiments and will not be repeated here.

[0060] As can be seen from the above embodiments:

[0061] In the display panel, the limiting layer is provided with a groove at the position corresponding to the light source, and a limiting part is formed corresponding to the first gap between the adjacent light sources, the color conversion unit is arranged in the groove, the groove wall is provided with a blazed grating, the blazed grating is located between the limiting part and the color conversion unit, the color conversion unit and the adjacent blazed grating have a second gap, in the light emitted by the light source, the light directly forms display light after being converted by the color conversion unit, or the light forms display light after being converted by the color conversion unit and being reflected by the blazed grating and then being emitted from the second gap, so that the light converted by the color conversion unit directly emits from the second gap after passing through the blazed grating, and will not pass through the color conversion unit again, thereby the light loss caused by multiple reflection of the metal coating film and scattering and reabsorption of the color conversion unit can be reduced, and the brightness can be improved.

[0062] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0063] The above describes the embodiments of the utility model in detail, the principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above embodiment is only used to help understand the technical scheme and core idea of the utility model; The person skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the utility model.

Claims

1. A display panel, characterized by, The display panel comprises: a driving substrate; a light source array arranged on the driving substrate, and a first gap between adjacent light sources; a limiting layer arranged on a side of the light source away from the driving substrate, the limiting layer being provided with a groove at a position corresponding to the light source, and the limiting layer comprising a limiting portion arranged in position with the first gap, the limiting portion surrounding the groove; a color conversion unit arranged in at least part of the groove; wherein a blazed grating is arranged on a groove wall of the groove, the blazed grating being located between the limiting portion and the color conversion unit, and a second gap between the color conversion unit and adjacent blazed gratings, and in the light emitted by the light source, light directly forming display light after being converted by the color conversion unit, or light forming display light after being converted by the color conversion unit and then reflected by the blazed grating and then emitted from the second gap.

2. The display panel of claim 1, wherein, In the light emitted by the light source, light that has passed through the color conversion unit without being converted by the color conversion unit is reflected by the blazed grating and then re-incident on the color conversion unit.

3. The display panel of claim 1, wherein, The display panel further comprises a light adjustment unit arranged in the second gap, the light adjustment unit covering at least the blazed grating, and the refractive index of the light adjustment unit being greater than the refractive index of the limiting portion.

4. The display panel of claim 1, wherein, The surface of the groove wall is a first inclined surface, the color conversion unit comprises a second inclined surface arranged face-to-face with the first inclined surface, and the inclined directions of the face-to-face arranged first and second inclined surfaces are the same relative to a parallel plane of the plane in which the driving substrate is located.

5. The display panel of claim 4, wherein, The included angle between the first inclined surface and the surface of the limiting portion close to the driving substrate is a first included angle, the included angle between the second inclined surface and the surface of the color conversion unit away from the driving substrate is a second included angle, the first included angle is equal to the second included angle, and the range of the first and second included angles is 60-70 degrees.

6. The display panel of claim 4, wherein, The included angle between the first inclined surface and the surface of the limiting portion close to the driving substrate is a first included angle, the included angle between the second inclined surface and the surface of the color conversion unit away from the driving substrate is a second included angle, the first included angle is less than the second included angle, the range of the first included angle is 60-70 degrees, and the range of the second included angle is 70-90 degrees.

7. The display panel of any one of claims 1-6, wherein, The blazed grating comprises a plurality of groove structures formed on the groove wall, each groove structure having a triangular cross section in a plane perpendicular to the groove wall, and adjacent two groove structures being connected by sharing a vertex.

8. The display panel of claim 7, wherein, The color conversion unit comprises a red quantum dot unit and a green quantum dot unit, and the red quantum dot unit and the green quantum dot unit are located in different grooves; The blazed grating corresponding to the red quantum dot unit has a first grating width and a first blaze angle, and the blazed grating corresponding to the green quantum dot unit has a second grating width and a second blaze angle, the first grating width is greater than the second grating width, and / or the first blaze angle is greater than the second blaze angle; The first grating width and the second grating width refer to widths of the groove structures in the corresponding blazed gratings in a first direction, which is the arrangement direction of the groove structures.

9. The display panel of claim 8, wherein, The display panel further comprises a plurality of sub-pixels arranged one-to-one with the grooves, each of the sub-pixels comprising one of the light sources, the plurality of sub-pixels comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel, the first sub-pixel comprising the red quantum dot unit and the light source corresponding to the red quantum dot unit, the second sub-pixel comprising the green quantum dot unit and the light source corresponding to the green quantum dot unit; The limiting portion is formed with a blazed grating in the groove corresponding to the third sub-pixel, the blazed grating corresponding to the third sub-pixel having a third grating width and a third blaze angle, the third grating width being smaller than the second grating width, and / or the third blaze angle being smaller than the second blaze angle.

10. The display panel of claim 8, wherein, The display panel further comprises a color filter unit arranged on a side of the color conversion unit away from the driving substrate, the color filter unit comprising a red filter unit arranged in alignment with the red quantum dot unit, and a green filter unit arranged in alignment with the green quantum dot unit.

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