Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device, and relates to the technical field of display. The display panel includes: a driving substrate; a plurality of light-emitting elements located on one side of the driving substrate; the color filter layer is positioned on one side of the light-emitting element; the color filter layer comprises a plurality of filter structures with different colors; the micro-lens array is positioned on one side of the color filter layer; the micro-lens array comprises micro-lenses arranged corresponding to the filtering structures; the micro lens comprises a first curvature surface and a second curvature surface which are opposite to each other; the curvature radius of the first curvature surface is smaller than that of the second curvature surface; and in the corresponding micro lens and the filtering structure, the curvature radius of the second curvature surface of the micro lens is in positive correlation with the wavelength of the light transmitted by the filtering structure. According to the technical scheme, light penetrating through the micro lenses can be gathered towards one side, the display brightness of the display panel is improved, and the color cast problem of the display panel is solved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] Organic-Light-Emitting Diode (OLED) display panels have the advantages of self-luminescence, high contrast and fast response, and are considered to be the next generation of emerging application technology for flat panel displays.

[0003] At present, OLED display panels include sub-pixels of different colors. By controlling the display luminance of each sub-pixel separately, the display panel can present a colorful picture. However, since each sub-pixel has a different display luminous efficiency, each display panel has a color cast problem when displaying pictures, which affects the overall display effect of the display panel. Summary of the invention

[0004] The present invention provides a display panel and a manufacturing method thereof, and a display device, so as to make the focusing direction of a microlens array uniform and controllable, improve the display brightness of the display panel, and effectively solve the color deviation problem of the display panel.

[0005] A first aspect of the present invention provides a display panel, the display panel comprising:

[0006] Driver substrate;

[0007] A plurality of light emitting elements located on one side of the driving substrate;

[0008] A color filter layer located on a side of the light emitting element away from the driving substrate; the color filter layer includes filter structures of multiple different colors;

[0009] A microlens array located on a side of the color filter layer away from the drive substrate; the microlens array includes microlenses arranged corresponding to each of the filter structures; the microlenses include a first curvature surface and a second curvature surface opposite to each other; the curvature radius of the first curvature surface is smaller than the curvature radius of the second curvature surface;

[0010] Wherein, in the corresponding microlens and the filter structure, the radius of curvature of the second curvature surface of the microlens is positively correlated with the wavelength of the light transmitted by the filter structure.

[0011] Optionally, in the same microlens, the direction in which the first curvature surface points to the second curvature surface is the curvature pointing direction;

[0012] Wherein, the curvatures of the microlenses point in the same direction.

[0013] Optionally, in the corresponding microlens and the filter structure, the size of the microlens is larger than the size of the filter structure.

[0014] Optionally, in a direction perpendicular to the plane where the driving substrate is located, in the corresponding microlenses and the light filtering structure, the microlenses cover the light filtering structure.

[0015] Optionally, in the corresponding microlens and the filter structure, the maximum thickness of the microlens is positively correlated with the wavelength of light transmitted by the filter structure.

[0016] Optionally, the thickness of the filter structure is positively correlated with the wavelength of light transmitted by the filter structure.

[0017] A second aspect of the present invention provides a method for manufacturing a display panel, the method comprising:

[0018] forming a driving substrate;

[0019] forming a plurality of light emitting elements on one side of the driving substrate;

[0020] A color filter layer is formed on a side of the light emitting element away from the driving substrate; the color filter layer includes filter structures of multiple different colors;

[0021] A microlens array is formed on a side of the color filter layer away from the driving substrate; the microlens array includes microlenses arranged corresponding to each of the filter structures; the microlenses include a first curvature surface and a second curvature surface opposite to each other; the curvature radius of the first curvature surface is smaller than the curvature radius of the second curvature surface;

[0022] Wherein, in the corresponding microlens and the filter structure, the radius of curvature of the second curvature surface of the microlens is positively correlated with the wavelength of the light transmitted by the filter structure.

[0023] Optionally, a microlens array is formed on a side of the color filter layer away from the driving substrate, comprising:

[0024] A lens photoresist layer is formed on the side of the color filter layer away from the driving substrate, and the photoresist layer is exposed, developed and baked in sequence to form the microlens array.

[0025] Optionally, when the filter structure includes a first filter structure, a second filter structure and a third filter structure, the microlens includes a first microlens corresponding to the first filter structure, a second microlens corresponding to the second filter structure and a third microlens corresponding to the third filter structure; the curvature radius of the second curvature surface of the first microlens is smaller than the curvature radius of the second curvature surface of the second microlens, and the curvature radius of the second curvature surface of the second microlens is smaller than the curvature radius of the second curvature surface of the third microlens;

[0026] A lens photoresist layer is formed on a side of the color filter layer away from the drive substrate, and the photoresist layer is sequentially exposed, developed and baked to form the microlens array, including:

[0027] forming a first lens photoresist layer on a side of the color filter layer away from the drive substrate;

[0028] exposing the first lens photoresist layer using a first photoresist plate, and after exposing the first lens photoresist layer, sequentially developing and baking the first lens photoresist layer to form a first microlens corresponding to the first filter structure;

[0029] forming a second lens photoresist layer on a side of the color filter layer and the first microlens away from the driving substrate;

[0030] exposing the second lens photoresist layer using a second photomask, and after exposing the second lens photoresist layer, sequentially developing and baking the second lens photoresist layer to form a second microlens corresponding to the second filter structure;

[0031] forming a third lens photoresist layer on a side of the color filter layer, the first microlens, and the second microlens away from the driving substrate;

[0032] The third lens photoresist layer is exposed using a third photolithography plate, and after the third lens photoresist layer is exposed, the third lens photoresist layer is developed and baked in sequence to form a third microlens corresponding to the third filter structure.

[0033] A third aspect of the present invention provides a display device, which includes the display panel as described above.

[0034] The technical solution of the present invention is to set a driving substrate in the display panel, set a plurality of light-emitting elements on one side of the driving substrate, and set a color filter layer on the side of the light-emitting element away from the driving substrate, wherein the color filter layer includes a plurality of filter structures of different colors, thereby realizing selective transmission of light of different colors; a microlens array is set on the side of the color filter layer away from the driving substrate, wherein the microlens array includes microlenses corresponding to the filter structures, and is used to aggregate the light passing through the filter structures, thereby improving the luminous brightness of the display panel; and at the same time, the microlens includes a first curvature surface and a second curvature surface opposite to each other, and the curvature radius of the first curvature surface is set to be smaller than the curvature radius of the second curvature surface. , so that the microlens can focus the light to a position closer to the first curvature surface. At the same time, by setting the curvature radius of the second curvature surface of the microlens in the corresponding microlens and the filter structure to be positively correlated with the wavelength of the light transmitted by the filter structure, the curvature radius of the second curvature surface of the microlens is matched with the wavelength of the light transmitted by the filter structure, ensuring that the light transmitted by each filter structure can have a higher focusing effect after passing through the microlens, thereby improving the color shift problem caused by different deflection angles of the light due to different wavelengths of the light, making the focusing direction of the microlens array unified and controllable, improving the display brightness of the display panel, and further improving the display effect of the display panel.

[0035] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0038] Figure 2 is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0039] Figure 3 is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0040] Figure 4 is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0041] Figure 5is a schematic diagram of a top view structure of a display panel provided by an embodiment of the present invention;

[0042] Figure 6 is a schematic diagram of a top view of another display panel provided by an embodiment of the present invention;

[0043] Figure 7 is a flow chart of a method for preparing a display panel provided by an embodiment of the present invention;

[0044] Figure 8 is a process flow chart of manufacturing a display panel provided by an embodiment of the present invention;

[0045] Fig. 9 is a flow chart of a method for preparing a microlens array provided by an embodiment of the present invention;

[0046] Fig.10 is a process flow chart of preparing a microlens array provided by an embodiment of the present invention;

[0047] Fig.11 is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0048] Fig.12 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] Figure 1is a schematic diagram of the structure of a display panel provided by an embodiment of the present invention, such as Figure 1 As shown, the display panel includes: a driving substrate 1; a plurality of light-emitting elements 2 located on one side of the driving substrate 1; a color filter layer 3 located on the side of the light-emitting element 2 away from the driving substrate 1; the color filter layer 3 includes a plurality of filter structures 31 of different colors; a microlens array 4 located on the side of the color filter layer 3 away from the driving substrate 1; the microlens array 4 includes microlenses 41 arranged corresponding to each filter structure 31; the microlens 41 includes a first curvature surface 401 and a second curvature surface 402 opposite to each other; the curvature radius of the first curvature surface 401 is smaller than the curvature radius of the second curvature surface 402; wherein, in the corresponding microlenses 41 and the filter structure 31, the curvature radius of the second curvature surface 402 of the microlens 41 is positively correlated with the wavelength of light transmitted by the filter structure 31.

[0052] The driving substrate 1 can be specifically understood as a substrate with an integrated driving circuit. Exemplarily, the driving substrate 1 may include a silicon-based substrate, in which a plurality of driving circuits arranged in an array are provided. The driving circuits may include a plurality of thin film transistors and capacitors, etc. Each driving circuit is electrically connected to each light-emitting element 2 to drive the light-emitting element 2 to emit light. The light-emitting element 2 may include a first electrode 21, a light-emitting functional layer 22, and a second electrode 23 stacked from one side of the silicon-based substrate. By applying corresponding electrical signals to the first electrode 21 and the second electrode 23, respectively, the light-emitting functional layer 22 can generate photons, thereby achieving light emission; the light-emitting color of the light-emitting element 2 may include at least one of blue, green, red, and white, etc. Exemplarily, continue to refer to Figure 1 The light-emitting element 2 may include a first light-emitting element 201, a second light-emitting element 202 and a third light-emitting element 203. The light-emitting color of the first light-emitting element 201 may be blue, the light-emitting color of the second light-emitting element 202 may be green, and the light-emitting color of the third light-emitting element 203 may be red. At this time, the light-emitting brightness of each light-emitting element 2 is controlled separately by the driving circuit, so that the display panel can present a colorful picture.

[0053] The color filter layer 3 may include a plurality of filter structures 31 of different colors, for example, see Figure 1, the filter structure 31 may include a first filter structure 301, a second filter structure 302 and a third filter structure 303, wherein the first filter structure 301 can transmit blue light and block light of other colors; the second filter structure 302 can transmit green light and block light of other colors; the third filter structure 303 can transmit red light and block light of other colors. In the direction perpendicular to the plane where the driving substrate 1 is located, the first filter structure 301 can cover the first light-emitting element 201, the second filter structure 302 can cover the second light-emitting element 202, and the third filter structure 303 can cover the third light-emitting element 203. Each filter structure 31 selectively transmits light of different colors to present a color display effect.

[0054] The microlens array 4 may include a plurality of microlenses 41 arranged in an array, and each microlens 41 may be provided corresponding to each filter structure 31. Exemplarily, when the filter structure 31 includes a first filter structure 301, a second filter structure 302, and a third filter structure 303, the microlens array 4 may include a first microlens 410, a second microlens 420, and a third microlens 430. The first microlens 410 is provided corresponding to the first filter structure 301 to aggregate the light passing through the first filter structure 301; the second microlens 420 is provided corresponding to the second filter structure 302 to aggregate the light passing through the second filter structure 302; and the third microlens 430 is provided corresponding to the third filter structure 303 to aggregate the light passing through the third filter structure 303. The microlens 41 may include a curvature surface convex toward a side away from the filter structure 31, and the curvature surface may include a first curvature surface 401 and a second curvature surface 402 opposite to each other. The curvature radius of the first curvature surface 401 of the same microlens 41 is different from the curvature radius of the second curvature surface 402. For example, the first microlens 410 includes a first curvature surface 411 and a second curvature surface 412 opposite to each other, and the curvature radius of the first curvature surface 411 is greater than the curvature radius of the second curvature surface 412; the second microlens 420 includes a first curvature surface 421 and a second curvature surface 422 opposite to each other, and the curvature radius of the first curvature surface 421 is greater than the curvature radius of the second curvature surface 422; the third microlens 430 includes a first curvature surface 431 and a second curvature surface 432 opposite to each other, and the curvature radius of the first curvature surface 431 is greater than the curvature radius of the second curvature surface 432.

[0055] It is understandable that if Figure 2As shown, the relationship between the radius of curvature of the microlens 41 and the focal length can satisfy the relationship 1 / f=(n-1)*(1 / R1-1 / R2), wherein f is the focal length, n is the medium refractive index, R1 and R2 are respectively the radius of curvature of the first curvature surface 401 and the radius of curvature of the second curvature surface 402 of the microlens 41, that is, the smaller the radius of curvature of the microlens, the larger the curvature of the microlens, the larger the refractive index of the microlens, and the shorter the focal length of the microlens. Therefore, when the radius of curvature of the first curvature surface 401 is smaller than the radius of curvature of the second curvature surface 402, the microlens 41 can focus the light to a position closer to the first curvature surface 401.

[0056] In addition, since the longer the wavelength of light is, the greater the degree of deflection in the optical medium, the curvature radius of the second curvature surface of the microlens in the corresponding microlens and filter structure can be set to be positively correlated with the wavelength of the light transmitted by the filter structure. For example, when the wavelength of the light transmitted by the first filter structure 301 is smaller than the wavelength of the light transmitted by the second filter structure 302, and the wavelength of the light transmitted by the second filter structure 302 is smaller than the wavelength of the light transmitted by the third filter structure 303, the curvature radius of the second curvature surface 412 of the first microlens 410 corresponding to the first filter structure 301 can be smaller than the curvature radius of the second curvature surface 412 corresponding to the second filter structure 303. 02, and the curvature radius of the second curvature surface 422 of the second microlens 420 corresponding to the second filtering structure 302 is smaller than the curvature radius of the second curvature surface 432 of the third microlens 430 corresponding to the third filtering structure 303, so that the focal length of the light passing through the first filtering structure 301 focused by the first microlens 410 is the shortest, the focal length of the light passing through the second filtering structure 302 focused by the second microlens 420 is the second shortest, and the focal length of the light passing through the third filtering structure 303 focused by the third microlens 430 is the largest. In this way, when the light passing through the first filter structure 301 is blue light, the light passing through the second filter structure 302 is green light, and the light passing through the third filter structure 303 is red light, the focusing positions of the blue light, the green light, and the red light can be kept consistent, so that the focusing direction of the microlens array 4 is unified and controllable, which improves the color cast problem caused by different deflection angles of light due to different wavelengths of light, improves the display brightness of the display panel, and further improves the display effect of the display panel.

[0057] It can also be understood that, under the premise of ensuring that the radius of curvature of the second curvature surface 402 of the microlens 41 corresponding to each filter structure 31 is positively correlated with the wavelength of the light transmitted by the filter structure 31, the radius of curvature of the first curvature surface 401 of the microlens 41 corresponding to each filter structure 31 can be the same or different, and the present invention is not limited to this.

[0058] In an embodiment of the present invention, a driving substrate is arranged in a display panel, a plurality of light-emitting elements are arranged on one side of the driving substrate, and a color filter layer is arranged on a side of the light-emitting element away from the driving substrate, wherein the color filter layer includes a plurality of filter structures of different colors, thereby realizing selective transmission of light of different colors; and a microlens array is arranged on a side of the color filter layer away from the driving substrate, wherein the microlens array includes microlenses arranged corresponding to each filter structure, and is used to aggregate light passing through each filter structure, thereby improving the luminous brightness of the display panel; and at the same time, the microlens includes a first curvature surface and a second curvature surface opposite to each other, and the curvature radius of the first curvature surface is set to be smaller than the curvature radius of the second curvature surface, Thus, the microlens can focus the light to a position closer to the first curvature surface. At the same time, by setting the curvature radius of the second curvature surface of the microlens in the corresponding microlens and the filter structure to be positively correlated with the wavelength of the light transmitted by the filter structure, the curvature radius of the second curvature surface of the microlens matches the wavelength of the light transmitted by the filter structure, ensuring that the light transmitted by each filter structure can have a higher focusing effect after passing through the microlens, thereby improving the color shift problem caused by different deflection angles of the light due to different wavelengths of the light, making the focusing direction of the microlens array unified and controllable, improving the display brightness of the display panel, and further improving the display effect of the display panel.

[0059] Optionally, in the same microlens, the direction in which the first curvature surface points to the second curvature surface is the curvature pointing direction; wherein the curvature pointing directions of each microlens are the same.

[0060] For details, please continue to refer to Figure 1 When the microlens 41 includes the first microlens 410, the second microlens 420 and the third microlens 430, the curvature pointing direction X of the first curvature surface 411 of the first microlens 410 pointing to the second curvature surface 412 thereof is the same as the curvature pointing direction X of the first curvature surface 421 of the second microlens 420 pointing to the second curvature surface 422 thereof, and the curvature pointing direction X of the first curvature surface 421 of the second microlens 420 pointing to the second curvature surface 422 thereof is the same as the curvature pointing direction X of the first curvature surface 431 of the third microlens 430 pointing to the second curvature surface 432 thereof. The pointing direction X of the rate is the same. At this time, the first microlens 410, the second microlens 420 and the third microlens 430 can all focus the light to the side of the first curvature surface 401 with a smaller curvature radius, that is, the first microlens 410, the second microlens 420 and the third microlens 430 can have the same focusing direction, so that the focusing positions of different color lights passing through different filtering structures can be kept consistent, thereby improving the display brightness of the display panel, effectively solving the color deviation problem of the display panel, and further improving the display effect of the display panel.

[0061] Understandably, Figure 1 and Figure 2The curvature direction X of each microlens 41 in the display panel is only exemplarily described as being from the left side to the right side of the paper. In the embodiment of the present invention, the curvature direction is not limited to Figure 1 and Figure 2 in the form of Figure 3 and Figure 4 As shown, the curvature direction X of each microlens 41 can also be from the right side of the paper to the left side. In this case, the light passing through each microlens is gathered toward the right side, which can also improve the display brightness of the display panel and improve the display color deviation. In the embodiment of the present invention, the curvature direction of each microlens 41 can be set according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0062] Optional, Figure 5 is a schematic diagram of a top view structure of a display panel provided by an embodiment of the present invention, Figure 6 is a schematic diagram of a top view of another display panel provided by an embodiment of the present invention. Figure 5 and Figure 6 As shown in any of the accompanying drawings, in the corresponding microlens and filter structure, the size of the microlens is larger than the size of the filter structure. Such a configuration can ensure that the light of the lens filter structure enters the microlens, so as to effectively avoid the problem of light leakage affecting the display brightness of the display panel, so that the microlens can effectively aggregate the light passing through the filter structure, and improve the contrast and display brightness of the display panel while improving the display color deviation of the display panel, thereby improving the display effect of the display panel.

[0063] It is understandable that the shape of the microlens may be the same as or different from the shape of the filter structure, and this is not specifically limited in the embodiment of the present invention. Figure 5 As shown, the shape of the filter structure 31 can be a quadrilateral, and the shape of the microlens 41 can be a circle or an ellipse, or, as shown in FIG. Figure 6 As shown, the shape of the filter structure 31 can be hexagonal, and the shape of the microlens 41 can still be circular or elliptical. The shapes of the filter structure 31 and the microlens 41 can be designed according to actual needs, and the present invention does not limit this.

[0064] Optional, continue to refer to Figure 5 and Figure 6 In the direction perpendicular to the plane where the driving substrate 1 is located, in the corresponding microlens 41 and the filter structure 31, the microlens 41 covers the filter structure 31. In this way, all the light passing through the filter structure 31 can enter the microlens 41, so that the microlens 41 can aggregate all the light passing through the filter structure 31, thereby preventing light leakage, thereby improving the display contrast and display brightness of the display panel, and further improving the display effect of the display panel.

[0065] Optional, continue to refer to Figure 1 In the corresponding microlens 41 and the filter structure 31 , the maximum thickness ( T21 , T22 , T23 ) of the microlens 41 is positively correlated with the wavelength of the light transmitted by the filter structure 31 .

[0066] Specifically, the wavelength of the light transmitted by the first filter structure 301 may be smaller than the wavelength of the light transmitted by the second filter structure 302, and the wavelength of the light transmitted by the second filter structure 302 may be smaller than the wavelength of the light transmitted by the third filter structure 303, that is, the color of the light transmitted by the first filter structure 301 may be blue, the color of the light transmitted by the second filter structure 302 may be green, and the color of the light transmitted by the third filter structure 303 may be red. When the light emitting element 2 includes an organic light emitting diode, the luminous efficiency of the organic light emitting diode with a red luminous color is greater than the luminous efficiency of the organic light emitting element with a blue luminous color, that is, the longer the wavelength of the light emitted by the organic light emitting diode, the higher its luminous efficiency. At the same time, the thinner the thickness of the film layer through which the light transmits during propagation, the smaller the light loss. Therefore, in order to make the luminous intensity of the light rays aggregated through each microlens 41 consistent, the thickness T21 of the first microlens 410 can be set to be smaller than the thickness T22 of the second microlens 420, and the thickness T22 of the second microlens 420 can be set to be smaller than the thickness T23 of the third microlens 430, so that the luminous intensity of the blue light rays aggregated through the first microlens 410 can be consistent with the luminous intensity of the green light rays aggregated through the second microlens 420, and the luminous intensity of the red light rays aggregated through the third microlens 430 can be consistent with the luminous intensity of the green light rays aggregated through the second microlens 420, so that the luminous intensity of the light rays of each color reaching the display surface of the display panel can be consistent, thereby effectively improving the display color shift problem of the display panel.

[0067] Optional, continue to refer to Figure 1 The thickness (T11, T12, T13) of the filter structure 31 is positively correlated with the wavelength of the light transmitted by the filter structure.

[0068] Specifically, the wavelength of the light passing through the first filter structure 301 may be smaller than the wavelength of the light passing through the second filter structure 302, and the wavelength of the light passing through the second filter structure 302 may be smaller than the wavelength of the light passing through the third filter structure 303, that is, the color of the light passing through the first filter structure 301 may be blue, the color of the light passing through the second filter structure 302 may be green, and the color of the light passing through the third filter structure 303 may be red. When the light emitting element 2 includes an organic light emitting diode, the luminous efficiency of the organic light emitting diode with red luminous color is greater than the luminous efficiency of the organic light emitting element with blue luminous color, that is, the longer the wavelength of the light emitted by the organic light emitting diode, the higher its luminous efficiency. At the same time, the thinner the thickness of the filter structure through which the light passes when propagating, the smaller the light loss. Therefore, in order to make the luminous intensity of the light transmitted through each filter structure 31 consistent, the thickness T11 of the first light-transmitting structure 301 can be set to be smaller than the thickness T12 of the second light-transmitting structure 302, and the thickness T12 of the second light-transmitting structure 302 can be set to be smaller than the thickness T13 of the third light-transmitting structure 303, so that the luminous intensity of the blue light transmitted through the first light-transmitting structure 301 can be consistent with the luminous intensity of the green light transmitted through the second light-transmitting structure 302, and the luminous intensity of the red light transmitted through the third light-transmitting structure 303 can be consistent with the luminous intensity of the green light transmitted through the second light-transmitting structure 302, so that the luminous intensity of the light of each color reaching the display surface of the display panel can be consistent, thereby effectively improving the display color deviation problem of the display panel.

[0069] Based on the same inventive concept, an embodiment of the present invention further provides a method for preparing a display panel. Figure 7 is a flow chart of a method for preparing a display panel provided by an embodiment of the present invention, Figure 8 is a flow chart of a manufacturing process of a display panel provided by an embodiment of the present invention, and is combined with reference to Figure 7 and Figure 8 As shown, the method for preparing the display panel includes:

[0070] S101, forming a driving substrate.

[0071] The driving substrate 1 may include a silicon-based substrate and a plurality of driving circuits disposed on the silicon-based substrate. The driving circuits may be formed by using processes such as deposition and etching.

[0072] S102 , forming a plurality of light emitting elements on one side of the driving substrate.

[0073] Among them, the multiple light-emitting elements 2 can be specifically understood as multiple organic light-emitting diodes located on one side of the driving substrate 1. Specifically, the method for forming the light-emitting element 2 may include: forming a first electrode layer on one side of the driving substrate 1 by deposition or the like, and etching the first electrode layer to form the first electrode 21 of each light-emitting element 2; forming a pixel definition layer on the side of the first electrode 21 away from the driving substrate, and patterning the pixel definition layer to form pixel openings in the pixel definition layer that leak out each first electrode 21; forming a light-emitting functional layer 22 at each pixel opening by evaporation or the like, the light-emitting functional layer 22 is a key part of the light-emitting element 2, and the light-emitting functional layer 22 that generates photons of different colors can be sequentially evaporated as needed; forming a second electrode layer 23 on the side of the light-emitting functional layer 22 away from the first electrode 21 by deposition or the like, the second electrode layer may include the second electrode 23 of each light-emitting element 2, and at this time, a light-emitting element 2 consisting of the first electrode 21, the light-emitting functional layer 22 and the second electrode 23 can be formed.

[0074] S103, forming a color filter layer on a side of the light emitting element away from the driving substrate.

[0075] The color filter layer 3 includes a plurality of filter structures 31 of different colors. For example, the filter structure 31 may include a first filter structure 301 that transmits blue light, a second filter structure 302 that transmits green light, and a third filter structure 303 that transmits red light. Each filter structure 31 in the color filter layer 3 may be formed by photolithography or other processes.

[0076] In an optional embodiment, forming a filter structure 31 of different colors on the side of the light-emitting element 2 away from the driving substrate 1 may include: forming a first filter layer on the side of the light-emitting element 2 away from the driving substrate 1 by a process such as spraying, and patterning the first filter layer by a photolithography process to retain the first filter structure 30 corresponding to the first light-emitting element 201; forming a second filter layer on the side of the first filter structure 301 and each light-emitting element 2 away from the driving substrate 1 by a process such as spraying, and patterning the second filter layer by a photolithography process to retain the second filter structure 302 corresponding to the second light-emitting element 202; at the same time, in the process of forming the second filter structure 302, due to process limitations and light transmittance requirements, the first filter structure 301 may be Partial etching is performed so that the thickness T12 of the formed second filter structure 302 is greater than the thickness T11 of the first filter structure 301; a third filter layer is formed on the first filter structure 301, the second filter structure 302, and the side of the light-emitting element 2 away from the driving substrate 1 by a process such as spraying, and the third filter layer is patterned by a process such as photolithography to retain the third filter structure 303 corresponding to the third light-emitting element 203; similarly, in the process of forming the third filter structure 303, due to process limitations and light transmittance requirements, the first filter structure 301 and the second filter structure 302 are partially etched, resulting in a thickness T13 of the third filter structure 303 being greater than the thickness T12 of the second filter structure 302 and the thickness T11 of the first filter structure 301. It can be understood that by sequentially forming the first filter structure, the second filter structure and the third filter structure, the thickness of the first light-transmitting structure is smaller than the thickness of the second filter structure, and the thickness of the second light-transmitting structure is smaller than the thickness of the third light-transmitting structure, so that the luminous intensity of the light transmitted through the first light-transmitting structure can be consistent with the luminous intensity of the light transmitted through the second light-transmitting structure, and the luminous intensity of the light transmitted through the third light-transmitting structure can be consistent with the luminous intensity of the light transmitted through the second light-transmitting structure, so that the luminous intensity of the light of each color reaching the display surface of the display panel can be consistent, thereby effectively improving the display color deviation problem of the display panel.

[0077] S104, forming a microlens array on a side of the color filter layer away from the driving substrate.

[0078] Among them, the microlens array 4 includes microlenses 41 arranged corresponding to each filtering structure 31; the microlens 41 includes a first curvature surface 401 and a second curvature surface 402 opposite to each other; the curvature radius of the first curvature surface 401 is smaller than the curvature radius of the second curvature surface 402; in the corresponding microlenses 41 and the filtering structure 31, the curvature radius of the second curvature surface of the microlens 41 is positively correlated with the wavelength of the light transmitted by the filtering structure 31.

[0079] In an optional embodiment, when the filter structure 31 includes the first filter structure 301, the second filter structure 302 and the third filter structure 303, the microlens 41 includes a first microlens 410 corresponding to the first filter structure 301, a second microlens 420 corresponding to the second filter structure 302 and a third microlens 430 corresponding to the third filter structure 303; the curvature radius of the second curvature surface 412 of the first microlens 410 is smaller than the curvature radius of the second curvature surface 422 of the second microlens 420, and the curvature radius of the second curvature surface 422 of the second microlens 420 is smaller than the curvature radius of the second curvature surface 432 of the third microlens 430.

[0080] Among them, when the filter structure 31 includes a first filter structure 301, a second filter structure 302 and a third filter structure 303, the microlens 41 of the microlens array 4 can also include a first microlens 410, a second microlens 420 and a third microlens 430, and each microlens 41 can be formed by processes such as photolithography and embossing.

[0081] Optionally, forming a microlens array 4 on the side of the color filter layer 3 away from the driving substrate 1 includes: forming a lens photoresist layer on the side of the color filter layer 3 away from the driving substrate 1, and sequentially exposing, developing and baking the photoresist layer to form the microlens array 4.

[0082] Specifically, a lens photoresist layer is coated on the side of the color filter layer 3 away from the drive substrate 1; a special matching photomask is used to expose the photomask to project a specific pattern onto the lens photoresist layer, and the pattern corresponds to the shape and position of each microlens in the microlens array; after exposure, the lens photoresist is also developed by development, and the photoresist in the unexposed area can be removed to expose the outline of the microlens 41 structure; the developed lens photoresist layer is baked to solidify and form a stable microlens structure. The microlens 41 includes a first curvature surface 401 and a second curvature surface 402 relative to each other. By setting the curvature radius of the first curvature surface 401 to be smaller than the curvature radius of the second curvature surface 402, the microlens 41 can focus light to a position closer to the first curvature surface 401. At the same time, in the corresponding microlens 41 and the filter structure 31, the curvature radius of the second curvature surface 402 of the microlens 41 is positively correlated with the wavelength of the light transmitted by the filter structure 31, so that the blue light, green light and red light transmitted through different filter structures 31 are all gathered toward one side, and the focusing position can be kept consistent, thereby improving the color cast problem caused by different deflection angles of light due to different wavelengths of light.

[0083] In an optional embodiment, in conjunction with reference Fig. 9 and Fig.10As shown, when the filter structure includes a first filter structure 301, a second filter structure 302 and a third filter structure 303, the microlens includes a first microlens 410 corresponding to the first filter structure 301, a second microlens 420 corresponding to the second filter structure 302 and a third microlens 430 corresponding to the third filter structure 303, and the curvature radius of the second curvature surface 411 of the first microlens 410 is smaller than the curvature radius of the second curvature surface 421 of the second microlens 420, and the curvature radius of the second curvature surface 420 is smaller than the curvature radius of the second curvature surface 432 of the third microlens 430, a lens photoresist layer is formed on a side of the color filter layer 3 away from the driving substrate 1, and the photoresist layer is sequentially exposed, developed and baked to form the microlens array 4, which may include:

[0084] S1041 , forming a first lens photoresist layer on a side of the color filter layer away from the driving substrate.

[0085] Specifically, the first lens photoresist layer 501 is formed on the side of the color filter layer 3 away from the driving substrate 1 by spin coating or other processes.

[0086] S1042, using a first photoresist plate to expose the first lens photoresist layer, and after the first lens photoresist layer is exposed, sequentially developing and baking the first lens photoresist layer to form a first microlens corresponding to the first filter structure.

[0087] Specifically, the first lens photoresist layer 501 is exposed using the first photoresist plate 601, so that the pattern on the first photoresist plate 601 can be transferred to the first lens photoresist layer 501, and after further developing the first lens photoresist layer 501 with a developer, the first lens photoresist layer 501 at the position corresponding to the pattern on the first photoresist plate 601 can be retained, and the first lens photoresist layer 501 at other positions can be removed; after baking the retained first lens photoresist layer 501, the first microlens 410 corresponding to the first filter structure 301 can be formed. The first microlens 410 includes a first curvature surface 411 and a second curvature surface 412 opposite to each other, and the curvature radius of the first curvature surface 411 is smaller than the curvature radius of the second curvature surface 412.

[0088] S1043, forming a second lens photoresist layer on a side of the color filter layer and the first microlens facing away from the driving substrate.

[0089] Specifically, after the first microlens 410 is formed, a second lens photoresist layer 502 may be formed on the side of the color filter layer 3 and the first microlens 410 away from the driving substrate 1 by a process such as spin coating.

[0090] S1044, using a second photoresist plate to expose the second lens photoresist layer, and after the second lens photoresist layer is exposed, sequentially developing and baking the second lens photoresist layer to form second microlenses corresponding to each second filter structure.

[0091] Specifically, the second lens photoresist layer 502 is exposed using the second photomask 602, so that the pattern on the second photomask 602 can be transferred to the second lens photoresist layer 502, and after further developing the second lens photoresist layer 502 with a developer, the second lens photoresist layer 502 at the position corresponding to the pattern on the second photomask 602 can be retained, and the second lens photoresist layer 502 at other positions can be removed; after baking the retained second lens photoresist layer 502, the second microlens 420 corresponding to the second filter structure 302 can be formed. The second microlens 420 includes a first curvature surface 421 and a second curvature surface 422 opposite to each other, and the curvature radius of the first curvature surface 421 is smaller than the curvature radius of the second curvature surface 422. At the same time, due to limitations of the process, the first microlens 410 may be partially etched during the exposure, development and baking of the second lens photoresist layer 502 , resulting in the maximum thickness T22 of the second microlens 420 being greater than the maximum thickness T21 of the first microlens 410 .

[0092] S1045, forming a third lens photoresist layer on a side of the color filter layer, the first microlens, and the second microlens away from the driving substrate.

[0093] Specifically, after the first microlens 410 and the second microlens 420 are formed, a third lens photoresist layer 503 is formed on the side of the color filter layer 3 , the first microlens 410 and the second microlens 420 away from the driving substrate 1 by a process such as spin coating.

[0094] S1046, using a third photomask to expose the third lens photoresist layer, and after the third lens photoresist layer is exposed, sequentially developing and baking the third lens photoresist layer to form third microlenses corresponding to each third filter structure.

[0095] Specifically, the third lens photoresist layer 503 is exposed using the third photoresist plate 603, so that the pattern on the third photoresist plate 603 can be transferred to the third lens photoresist layer 503, and after the third lens photoresist layer 503 is further developed using a developer, the third lens photoresist layer 503 at the position corresponding to the pattern on the third photoresist plate 603 can be retained, and the third lens photoresist layer 503 at other positions can be removed; after the retained third lens photoresist layer 503 is baked, the third microlens 430 corresponding to the third filter structure 303 can be formed. The third microlens 430 includes a first curvature surface 431 and a second curvature surface 432 opposite to each other, and the curvature radius of the first curvature surface 431 is smaller than the curvature radius of the second curvature surface 432. Similarly, during the exposure, development and baking process of the third lens photoresist layer 503, due to limitations of the process, the first microlens 410 and the second microlens 420 may be partially etched, resulting in the maximum thickness T23 of the third microlens 430 being greater than the maximum thickness T22 of the second microlens 420 and the maximum thickness T21 of the first microlens 410.

[0096] It can be understood that by sequentially exposing, developing and baking the first lens photoresist layer, the second lens photoresist layer and the third lens photoresist layer, the first microlens, the second microlens and the third microlens are sequentially formed, so that the maximum thickness of the first microlens is less than the maximum thickness of the second microlens, and the maximum thickness of the second microlens is less than the maximum thickness of the third microlens, so that the luminous intensity of the blue light after being polymerized through the first microlens can be consistent with the luminous intensity of the green light after being polymerized through the second microlens, and the luminous intensity of the red light after being polymerized through the third microlens can be consistent with the luminous intensity of the green light after being polymerized through the second microlens, so that the luminous intensity of the light of each color reaching the display surface of the display panel can be consistent, thereby effectively improving the display color shift problem of the display panel.

[0097] Based on the same inventive concept, an embodiment of the present invention further provides a display device, comprising at least one display panel of the above embodiment. Therefore, the display device provided by the embodiment of the present invention has all the technical features of the display panel provided by the embodiment of the present invention, and can achieve the beneficial effects of the display panel provided by the embodiment of the present invention. The similarities can be referred to the above description, and will not be repeated here.

[0098] It is understood that the display device may include one or more display panels, such as Fig.11As shown, when the display device includes two display panels, namely, display panel 01 and display panel 02, display panel 01 and display panel 02 can be symmetrically arranged, that is, the curvature pointing direction X+ of each microlens 41 in display panel 01 is from the right side of the paper to the left side, and the curvature pointing direction X- of each microlens 41 in display panel 02 can be from the left side of the paper to the right side, so that the light passing through each microlens 41 in display panel 01 is gathered toward the right side, and the light passing through each microlens 41 in display panel 02 is gathered toward the left side, that is, the light emitted by each display panel in the display device can be gathered toward the center of the display device, thereby meeting the user's use requirements for the display device.

[0099] In an optional embodiment, if Fig.12 As shown, the display device including two display panels can be applied to the field of virtual reality technology. For example, the display device including two display panels can be VR glasses 001. In this case, Fig.11 The two display panels shown are located on the lens 002 of the VR glasses 001, wherein by placing the display panel 01 at the left lens position of the VR glasses 001 and placing the display panel 02 at the right lens position of the VR glasses 001, the display panel 01 can focus the light of the left lens of the VR glasses to the position of the user's left eye, and the display panel 02 can focus the light of the right lens of the VR glasses to the position of the user's right eye, thereby increasing the display brightness of the VR glasses at the user's eye positions and improving the user's visual experience when using the VR glasses.

[0100] Since the display device described above is a device including the display panel in the embodiment of the present invention, based on the display panel described in the embodiment of the present invention, a person skilled in the art can understand the specific implementation of the display device of the present embodiment and its various variations, so how the display device achieves the beneficial effects of the display panel in the embodiment of the present invention is not described in detail here. As long as a person skilled in the art implements a display device including the display panel in the embodiment of the present invention, it belongs to the scope of protection of this application.

[0101] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0102] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, characterized in that: include: Driver substrate; A plurality of light emitting elements located on one side of the driving substrate; A color filter layer located on a side of the light emitting element away from the driving substrate; The color filter layer includes filter structures of multiple different colors; A microlens array located on a side of the color filter layer away from the drive substrate; the microlens array includes microlenses arranged corresponding to each of the filter structures; the microlenses include a first curvature surface and a second curvature surface opposite to each other; the curvature radius of the first curvature surface is smaller than the curvature radius of the second curvature surface; Wherein, in the corresponding microlens and the filter structure, the radius of curvature of the second curvature surface of the microlens is positively correlated with the wavelength of the light transmitted by the filter structure.

2. The display panel according to claim 1, characterized in that: In the same microlens, the direction in which the first curvature surface points to the second curvature surface is the curvature pointing direction; Wherein, the curvatures of the microlenses point in the same direction.

3. The display panel according to claim 1, characterized in that: In the corresponding microlens and the filter structure, the size of the microlens is larger than the size of the filter structure.

4. The display panel according to claim 3, characterized in that: In a direction perpendicular to the plane where the driving substrate is located, in the corresponding microlens and the filter structure, the microlens covers the filter structure.

5. The display panel according to claim 1, characterized in that: In the corresponding microlens and the filter structure, the maximum thickness of the microlens is positively correlated with the wavelength of the light transmitted by the filter structure.

6. The display panel according to claim 1, characterized in that: The thickness of the filter structure is positively correlated with the wavelength of the light transmitted by the filter structure.

7. A method for preparing a display panel, characterized in that: include: forming a driving substrate; forming a plurality of light emitting elements on one side of the driving substrate; A color filter layer is formed on a side of the light emitting element away from the driving substrate; the color filter layer includes filter structures of multiple different colors; A microlens array is formed on a side of the color filter layer away from the driving substrate; the microlens array includes microlenses arranged corresponding to each of the filter structures; the microlenses include a first curvature surface and a second curvature surface opposite to each other; the curvature radius of the first curvature surface is smaller than the curvature radius of the second curvature surface; Wherein, in the corresponding microlens and the filter structure, the radius of curvature of the second curvature surface of the microlens is positively correlated with the wavelength of the light transmitted by the filter structure.

8. The method for preparing a display panel according to claim 7, characterized in that: A microlens array is formed on a side of the color filter layer away from the driving substrate, comprising: A lens photoresist layer is formed on the side of the color filter layer away from the driving substrate, and the photoresist layer is exposed, developed and baked in sequence to form the microlens array.

9. The method for preparing a display panel according to claim 8, characterized in that: When the filter structure includes a first filter structure, a second filter structure and a third filter structure, the microlens includes a first microlens corresponding to the first filter structure, a second microlens corresponding to the second filter structure and a third microlens corresponding to the third filter structure; the curvature radius of the second curvature surface of the first microlens is smaller than the curvature radius of the second curvature surface of the second microlens, and the curvature radius of the second curvature surface of the second microlens is smaller than the curvature radius of the second curvature surface of the third microlens; A lens photoresist layer is formed on a side of the color filter layer away from the drive substrate, and the photoresist layer is sequentially exposed, developed and baked to form the microlens array, including: forming a first lens photoresist layer on a side of the color filter layer away from the drive substrate; exposing the first lens photoresist layer using a first photoresist plate, and after exposing the first lens photoresist layer, sequentially developing and baking the first lens photoresist layer to form a first microlens corresponding to the first filter structure; forming a second lens photoresist layer on a side of the color filter layer and the first microlens away from the driving substrate; exposing the second lens photoresist layer using a second photomask, and after exposing the second lens photoresist layer, sequentially developing and baking the second lens photoresist layer to form a second microlens corresponding to the second filter structure; forming a third lens photoresist layer on a side of the color filter layer, the first microlens, and the second microlens away from the driving substrate; The third lens photoresist layer is exposed using a third photolithography plate, and after the third lens photoresist layer is exposed, the third lens photoresist layer is developed and baked in sequence to form a third microlens corresponding to the third filter structure.

10. A display device, characterized in that: include: At least one display panel according to any one of claims 1 to 6.

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