Display panel and display device

Abstract

The utility model provides a display panel and a display device. The display panel comprises a substrate; the light-emitting device layer is arranged on the substrate, the light-emitting device layer comprises pixels arranged in an array mode, and each pixel comprises a pixel defining layer and a sub-pixel defined by the pixel defining layer; the packaging layer, the touch control layer and the dimming layer are arranged on the light emitting side of the light emitting device layer and sequentially stacked in the direction away from the substrate, the dimming layer comprises a lens layer and a first insulating layer covering the lens layer, and the lens layer comprises lens structures in one-to-one correspondence with the sub-pixels. The light-transmitting color of any lens structure is the same as the light-emitting color of the corresponding sub-pixel, the refractive index of the lens structure is larger than that of the first insulating layer, and the thickness of the first insulating layer is gradually increased in the direction extending from the center position of the sub-pixel to the edge position of the sub-pixel.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display. More particularly, it relates to a display panel and a display device. BACKGROUND

[0002] With the continuous progress of automobile technology, the vehicle display screen has become an important component indispensable to modern cars. As a key interface for human-computer interaction, the vehicle display screen not only improves the convenience and entertainment of driving, but also greatly enriches the driving experience by displaying driving information, navigation routes, entertainment content, etc.

[0003] OLED display devices are widely used in the field of vehicle display screens due to their wide color gamut, bright colors, and the ability to be curved or full-screen. However, when OLED display devices are applied to vehicle display screens, there are two main problems: first, the mirror reflection caused by the irradiation of external light on the screen surface, and second, the image reflection formed by the irradiation of the screen display light on the windshield. Both the mirror reflection and the image reflection can pose a certain safety hazard during driving. In addition, for display screens that implement entertainment functions on the co-driver side, users also hope that the display screen will not interfere with the main driver during use. SUMMARY

[0004] The purpose of the present disclosure is to provide a display panel and a display device to achieve narrow viewing angle display of the display panel, thereby solving the above technical problems.

[0005] To achieve the above purpose, the present disclosure adopts the following technical solutions:

[0006] The first aspect of the present disclosure provides a display panel, comprising:

[0007] a substrate substrate;

[0008] a light emitting device layer disposed on the substrate substrate, the light emitting device layer comprising an array of pixels, each pixel comprising a pixel defining layer and a sub-pixel defined by the pixel defining layer;

[0009] a packaging layer, a touch layer and a dimming layer disposed on the light emitting device layer in sequence away from the substrate substrate, the dimming layer comprising a lens layer and a first insulating layer covering the lens layer, the lens layer comprising a lens structure corresponding to each sub-pixel, the light transmission color of any lens structure being the same as the light emitting color of the corresponding sub-pixel, the refractive index of the lens structure being greater than the refractive index of the first insulating layer, the thickness of the first insulating layer gradually increasing in the direction extending from the center position of the sub-pixel to the edge position of the sub-pixel.

[0010] Optionally, the light-emitting colors of the sub-pixels include a first color, a second color, and a third color, the lens layer includes a first color lens structure, a second color lens structure, and a third color lens structure, and the refractive indexes of the first color lens structure, the second color lens structure, and the third color lens structure are all greater than the refractive index of the first insulating layer.

[0011] Optionally, the first color, the second color, and the third color are red, green, and blue respectively, the refractive index of the third color lens structure is greater than or equal to the refractive index of the first color lens structure, and the refractive index of the third color lens structure is greater than or equal to the refractive index of the second color lens structure.

[0012] Optionally, the refractive index of the second color lens structure is greater than or equal to the refractive index of the first color lens structure.

[0013] Optionally, the refractive index difference between the first color lens structure, the second color lens structure, and the third color lens structure and the first insulating layer is greater than or equal to 0.05 and less than or equal to 0.4.

[0014] Optionally, the first color, the second color, and the third color are red, green, and blue respectively, the aspect ratio of the third color lens structure is greater than or equal to the aspect ratio of the first color lens structure, and the aspect ratio of the third color lens structure is greater than or equal to the aspect ratio of the second color lens structure.

[0015] Optionally, the aspect ratio of the first color lens structure, the second color lens structure, and the third color lens structure is greater than or equal to 0.2 and less than or equal to 0.5.

[0016] Optionally, the lens structure is a plano-convex lens, and the thickness of the plano-convex lens gradually decreases in a direction extending from the center position of the corresponding sub-pixel to the edge position of the sub-pixel.

[0017] Optionally, the first insulating layer is formed by photoresist material doped with first color pigment, second color pigment, and third color pigment, and the transmittance of the first insulating layer to visible light is greater than or equal to 50% and less than or equal to 85%.

[0018] Optionally, the display panel further includes a light shielding structure, the light shielding structure is arranged on the lens layer or arranged on the touch layer, and the orthographic projection of the light shielding structure on the substrate substrate is located between the orthographic projections of two adjacent sub-pixels on the substrate substrate.

[0019] Optionally, the touch layer comprises a first metal layer, a second insulating layer and a second metal layer stacked in sequence in a direction away from the substrate, a plurality of first touch electrodes are formed on the first metal layer, a plurality of second touch electrodes are formed on the second metal layer, the orthographic projection of the first touch electrodes and the second touch electrodes on the substrate is between the orthographic projection of two adjacent sub-pixels on the substrate, the first touch electrodes and the second touch electrodes adopt light shielding metal materials, and the first touch electrodes and the second touch electrodes form the light shielding structure.

[0020] Optionally, the light shielding structure is arranged between adjacent lens structures, and the light shielding structure is a layer of black photoresist material.

[0021] Optionally, the first color, the second color and the third color are red, green and blue respectively, the light shielding structure comprises a first film layer and a second film layer stacked in sequence, the first film layer is arranged in the same layer as the first color lens structure, and the second film layer is arranged in the same layer as the third color lens structure.

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

[0023] The present disclosure has the following beneficial effects:

[0024] The display panel of the embodiment of the present disclosure is provided with the lens structure corresponding to the sub-pixel one by one and the first insulating layer covering the lens structure outside the touch layer, and the refractive index of the lens structure is greater than the refractive index of the first insulating layer, and the thickness of the first insulating layer gradually increases in the direction extending from the center position of the sub-pixel to the edge position of the sub-pixel. In this way, the lens structure can focus the outgoing light of the sub-pixel in a specific direction, and the first insulating layer maintains a high transmittance in this direction while suppressing the transmission of light in other directions, so that the light emission of the display panel presents the characteristics of high center brightness and low edge brightness, realizing narrow viewing angle display. At the same time, the display panel in the embodiment of the present disclosure has a simple structure, and compared with the conventional narrow viewing angle scheme, the mask process times can be simplified. BRIEF DESCRIPTION OF DRAWINGS

[0025] The specific embodiments of the present disclosure will be described in further detail below with reference to the accompanying drawings.

[0026] Figure 1 A scene diagram for forming a reflection of a vehicle-mounted display screen on a windshield in the related art;

[0027] Figure 2 A viewing angle diagram of a vehicle-mounted display screen in the related art;

[0028] Figure 3A structure diagram for realizing narrow viewing angle display of a display panel;

[0029] Figure 4 A structure diagram of a film layer of a display panel provided by an embodiment of the present disclosure;

[0030] Figure 5 A structure diagram for setting different width-height ratios by different lens structures provided by an embodiment of the present disclosure;

[0031] Figure 6 A structure diagram for adopting a conventional BM for a light shielding structure provided by an embodiment of the present disclosure;

[0032] Figure 7 A structure diagram for setting a light shielding structure and a lens structure in the same layer provided by an embodiment of the present disclosure;

[0033] Figure 8 Another structure diagram of a film layer of a display panel provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of protection of the present disclosure.

[0035] Unless otherwise defined, technical terms or scientific terms used in the present disclosure should be understood as their common meanings in the field of the present disclosure to those having ordinary skill in the art. The terms “first”, “second” and similar terms used in the present disclosure do not represent any order, number or importance, but are only used to distinguish different components. Similarly, the terms “one”, “an” or “the” and similar terms do not represent a quantity limitation, but represent the existence of at least one. The terms “include” or “contain” and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms “connect” or “connected” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “up”, “down”, “left”, “right” and the like only represent relative positional relationships, which can change accordingly when the absolute positions of the described objects change.

[0036] In the related art, the problems of the vehicle-mounted display screen mainly include:

[0037] (1) When strong light from outside the vehicle is incident on the screen surface, specular reflection occurs, which makes it difficult for the driver to clearly read the screen content, especially in direct sunlight. The specular reflection can make the screen almost a mirror, seriously affecting road safety.

[0038] (2) The image reflection formed by the light emitted by the vehicle screen on the windshield (as shown in Figure 1 ), which not only interferes with the driver's observation of the driving route ahead, but also blocks the rearview mirror's view, further increasing the risk of driving, especially at night or in low-light environments. The image reflection problem is particularly prominent, as it can lead to the driver's misjudgment of the surrounding environment.

[0039] (3) The co-driver's entertainment function display screen may interfere with the main driver during use, and the user wants to avoid interference with the main driver during use of the display screen (as shown in Figure 2 ).

[0040] When the display has a low viewing angle, the display content will become blurred or invisible outside a certain angle, which can effectively reduce the problems of specular reflection and image reflection, and can also alleviate the interference of the co-driver's vehicle display screen with the main driver.

[0041] In related technologies, in order to achieve narrow viewing angle display of the display screen, it is usually necessary to purchase expensive LCF (Light Control Film) film. In order to reduce costs, some display panel manufacturers have developed a technical solution, which is to add 3 mask (mask) processes in the OLED display to replace the externally purchased LCF film with 3 layers of organic film, but the process is complex and the cost is high.

[0042] Please refer to Figure 3 , Figure 3 The film layer structure diagram of one embodiment of the narrow viewing angle display panel in the related art is shown in Figure 3As shown, in the related art, the display panel includes a substrate 100, a driving circuit layer 110, a light emitting device layer 120, an encapsulation layer 130, a touch layer 140, and a color filter layer 150 which are sequentially stacked on the substrate 100, wherein the light emitting device layer 120 is formed with a plurality of sub-pixels, such as a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B, the touch layer 140 includes a first metal layer (TMA) 1410, an insulating layer 1420, a second metal layer (TMB) 1430, and a planarization layer (OC0) 1440 which are sequentially stacked, and the color filter layer 150 includes a plurality of black matrices BM and color filters which are arranged between adjacent black matrices BM, wherein the color filters correspond to the sub-pixels one by one, such as a color filter corresponding to the red sub-pixel R is denoted as R-CF, a color filter corresponding to the green sub-pixel G is denoted as G-CF, and a color filter corresponding to the blue sub-pixel B is denoted as B-CF. In order to realize narrow viewing angle of the display panel, an auxiliary layer 160 is prepared on a side of the color filter layer 150 close to the touch layer 140, and specifically, as shown in Figure 3 As shown, the auxiliary layer 160 includes a black matrix BM1 and a planarization layer OC1 covering the black matrix BM1, and the viewing angle of the display panel is controlled by controlling the spacing and relative position between the black matrix BM1 and the black matrix BM. However, the above scheme needs to additionally increase the BM1 and OC1 structures, and the structure is complex, and needs to additionally increase 2 mask processes.

[0043] In order to solve the technical problems of high cost, complex structure and process when the display panel realizes narrow viewing angle display, the display panel provided by the embodiments of the present disclosure is provided, please refer to Figure 4 , Figure 4 The schematic diagram of one of the film layer structures of the display panel provided by the embodiments of the present disclosure is shown in Figure 4 As shown, the display panel includes:

[0044] a substrate 210;

[0045] a light emitting device layer 220 arranged on the substrate 210, wherein the light emitting device layer 220 includes a plurality of pixels arranged in an array, and each pixel includes a pixel defining layer and a sub-pixel defined by the pixel defining layer;

[0046] A package layer 230, a touch layer 240 and a light modulation layer 250 are sequentially stacked on the light emitting device layer 220 and away from the substrate 210. The light modulation layer 250 includes a lens layer 2510 and a first insulating layer 2520 covering the lens layer 2510. The lens layer 2510 includes lens structures corresponding to the sub-pixels. The lens structure has the same light transmission color as the corresponding sub-pixel. The refractive index of the lens structure is greater than the refractive index of the first insulating layer 2520. The thickness of the first insulating layer 2520 gradually increases in a direction from the center of the sub-pixel to the edge of the sub-pixel.

[0047] Optionally, the substrate 210 can be a flexible substrate made of polyimide (PI), polyethylene naphthalate (PEN), thermoplastic polyester (PET) or the like, or a rigid substrate made of glass, quartz or the like. The display panel can further include a barrier layer and a buffer layer between the substrate 210 and the light emitting device layer 220. For example, the barrier layer and the buffer layer can be formed on the substrate 210. The barrier layer can be made of inorganic insulating materials such as silicon oxide, silicon nitride or silicon oxynitride, which is beneficial to blocking water and oxygen from entering the OLED formed later. The buffer layer can also be made of inorganic insulating materials such as silicon oxide, silicon nitride or silicon oxynitride, which is beneficial to the quality of subsequent material deposition.

[0048] Optionally, as shown in FIG. 2B, the light emitting device layer 220 includes a first electrode layer 2210, a pixel defining layer 2220, a light emitting material layer 2230 and a second electrode layer which are sequentially stacked. For example, the first electrode layer 2210 is an anode layer, and the second electrode layer is a cathode layer. Figure 4 Optionally, as shown in FIG. 2B, the light emitting device layer 220 includes a first electrode layer 2210, a pixel defining layer 2220, a light emitting material layer 2230 and a second electrode layer which are sequentially stacked. For example, the first electrode layer 2210 is an anode layer, and the second electrode layer is a cathode layer. Figure 4 Optionally, as shown in FIG. 2B, the light emitting device layer 220 includes a first electrode layer 2210, a pixel defining layer 2220, a light emitting material layer 2230 and a second electrode layer which are sequentially stacked. For example, the first electrode layer 2210 is an anode layer, and the second electrode layer is a cathode layer.

[0049] Optionally, the encapsulation layer 230 is provided above the second electrode layer, and is generally a multilayer structure in which organic layers and inorganic layers are staggered and stacked. Taking the simplest three-layer encapsulation structure as an example, the embodiment of the present disclosure includes a first inorganic encapsulation layer (CVD1) 2310, an organic encapsulation layer (IJP) 2320, and a second inorganic encapsulation layer (CVD2) 2330 stacked in sequence. Among them, the first inorganic encapsulation layer 2310 and the second inorganic encapsulation layer 2330 can be formed by using inorganic materials such as silicon nitride, silicon oxide, and silicon oxynitride, and by deposition and the like. In addition, the first inorganic encapsulation layer 2310 and the second inorganic encapsulation layer 2330 can also be replaced by other water- and oxygen-blocking inorganic layers, such as aluminum oxide Al2O3 deposited by ALD. The organic encapsulation layer 2320 can be formed using organic materials such as polyimide (PI) and epoxy resin through methods such as inkjet printing. Furthermore, the organic encapsulation layer can be replaced by other organic layers with good particle coating effects, such as an OC (Organic Coating) layer formed by photolithography. Currently, this material has a visible light transmittance of over 98%, which can effectively prevent light loss. Thus, the first inorganic encapsulation layer 2310, the organic encapsulation layer 2320, and the second inorganic encapsulation layer 2330 form a composite encapsulation layer, which can provide multiple protections for the functional structure of the display panel and provide a better encapsulation effect.

[0050] Optional, such as Figure 4 As shown, the touch layer 240 includes a first metal layer (TMA) 2410, a second insulating layer (TLD) 2420, and a second metal layer (TMB) 2430 stacked in sequence in a direction away from the base substrate 210. A plurality of first touch electrodes are formed on the first metal layer 2410, and a plurality of second touch electrodes are formed on the second metal layer 2430. The orthographic projections of the first touch electrode and the second touch electrode on the base substrate 210 are located between the orthographic projections of two adjacent sub-pixels on the base substrate 210. The first touch electrode, the second touch electrode at the corresponding position, and the second insulating layer 2420 located between the first touch electrode and the second touch electrode form a touch unit. In addition, the touch layer 240 may further include a planarization layer 2440 located above the second metal layer 2430. The planarization layer 2440 may be prepared using a photoresist material. In the embodiment of the present disclosure, the touch layer 240 is formed above the encapsulation layer 230, which is an on-celltouch structure.

[0051] Optional, such as Figure 4As shown, the light modulation layer 250 includes a lens layer 2510 and a first insulating layer 2520 covering the lens layer 2510. The lens layer 2510 includes lens structures corresponding to the sub-pixels, including two aspects: on the one hand, each sub-pixel corresponds to a lens structure, and the light transmission color of the lens structure is the same as the light emission color of the corresponding sub-pixel, for example: the lens structure corresponding to the red sub-pixel only allows red light to pass through, the lens structure corresponding to the green sub-pixel only allows green light to pass through, and the lens structure corresponding to the blue sub-pixel only allows blue light to pass through; on the other hand, the position of the sub-pixel corresponds to the position of the lens structure, for example, the orthographic projection of the lens structure on the substrate 210 completely overlaps the orthographic projection of the light emission area of the sub-pixel on the substrate 210, and the center of the lens structure and the projection of the center position of the sub-pixel overlap, wherein the light emission areas of adjacent sub-pixels do not overlap, and the light emission area of any sub-pixel is generally larger than the area corresponding to the first opening, so that the adjacent lens structures do not overlap, and the area between adjacent lenses is slightly smaller than the area corresponding to the pixel definition structure between the adjacent sub-pixels.

[0052] In the embodiment of the present disclosure, the lens structure is a plano-convex lens, and the thickness d1 of the plano-convex lens gradually decreases in the direction extending from the center position O of the corresponding sub-pixel to the edge position of the sub-pixel (for example, the X direction shown in FIG. 10). Figure 4 Since the first insulating layer 2520 is a planarization layer covering the lens structure, the thickness variation trend of the first insulating layer 2520 is opposite to that of the lens structure, and the sum of the thickness d2 of the first insulating layer 2520 and the thickness d1 of the lens structure is d, d represents the thickness of the first insulating layer 2520 in the area outside the lens structure. Specifically, the thickness d2 of the first insulating layer 2520 gradually increases in the direction extending from the center position O of the sub-pixel to the edge position of the sub-pixel, that is, the closer to the edge of the lens structure, the thicker the thickness of the first insulating layer 2520, and the closer to the center of the lens structure, the thinner the thickness of the first insulating layer 2520. Wherein, the thickness d2 of the first insulating layer 2520 gradually increases in the direction extending from the center position of the sub-pixel to the edge position of the sub-pixel can also be understood as the thickness d2 of the first insulating layer 2520 gradually increases in the direction extending from the center position of the lens structure to the edge position of the lens structure, which is realized by the orthographic projection of the center of the lens structure and the center of the sub-pixel on the substrate 210 overlapping.

[0053] Optionally, the lens structure is designed in a hemispherical or parabolic shape. By designing the lens structure in a hemispherical or parabolic shape, the position of the light convergence point and the focusing effect can be optimized. For example, the light emitted by the sub-pixels inside the display panel can be effectively converged to the center, thereby reducing the viewing angle of the display panel. In addition, the size of the lens structure also affects the light convergence effect. A larger size lens structure can accommodate more light and converge through a longer path. Optionally, the center height of the lens structure is 5-10 microns, that is, the maximum vertical distance between the lens structure and the touch layer 240 is 5-10 microns.

[0054] In the embodiments of the present disclosure, the refractive index of the lens structure is greater than the refractive index of the first insulating layer 2520, that is, the lens structure is a high refractive index material, and the first insulating layer 2520 is a low refractive index material. By using a high refractive index lens structure and a low refractive index first insulating layer 2520, a structure similar to a convex lens can be formed, which can change the propagation path of light and make parallel light converge at a point after passing through the lens structure, thereby achieving the light convergence effect.

[0055] Optionally, the first insulating layer 2520 is a photoresist material with low refractive index and low transmittance of visible light full wavelength, that is, the transmittance of the first insulating layer 2520 to visible light of any wavelength in the visible light range is low. In the embodiments of the present disclosure, the low transmittance range is 50% to 85%, that is, the transmittance of the first insulating layer 2520 to visible light is greater than or equal to 50% and less than or equal to 85%.

[0056] In one possible implementation, the first insulating layer 2520 is formed by a photoresist material doped with a first color pigment, a second color pigment, and a third color pigment. The first color pigment refers to a pigment that can achieve first color transmittance, the second color pigment refers to a pigment that can achieve second color transmittance, and the third color pigment refers to a pigment that can achieve third color transmittance. The obtained first insulating layer 2520 can at least transmit red, green, and blue light. It can be understood that the first insulating layer 2520 in the embodiments of the present disclosure can also be formed by using other materials as long as the refractive index and transmittance requirements defined in the embodiments of the present disclosure are met.

[0057] Compared with the related art, the display panel of the embodiments of the present disclosure realizes the principle of narrow viewing angle display by matching the lens structure with the first insulating layer.

[0058] (1) The lens structure is a convex lens structure, which can realize light focusing and make the light emitted by the corresponding sub-pixel shoot out from the center area of the lens structure;

[0059] (2) The first insulating layer adopts a photoresist material with low transmittance for all wavelengths of visible light, and the first insulating layer is relatively thick at the edge part of the lens structure, and the light absorption and scattering of the thick photoresist material are enhanced, so that it is difficult for light to pass through, and the effect of almost no light transmission can be achieved. The first insulating layer is relatively thin at the center position of the lens structure, and the light absorption and scattering of the thin photoresist material are weak, so that light can pass through more smoothly, and thus it can be ensured that the light at the center region can normally pass through.

[0060] (3) The refractive index of the first insulating layer is less than the refractive index of the lens structure. When the outcoming light of the sub-pixel is emitted from the lens structure to the first insulating layer and the incident angle is greater than the critical angle, the light will be totally reflected on the interface, and the light will not enter the first insulating layer. Thus, the outcoming light with an incident angle greater than the critical angle can be effectively suppressed, and only the light with an incident angle less than the critical angle can pass through, so as to adjust the light emission angle.

[0061] (4) The anisotropy of light emission of the first insulating layer and the lens structure is the same, that is, the light is transmitted at the center region of the lens structure, and the light is not transmitted at the edge region. That is, the outcoming light of the sub-pixel is focused in a specific direction through the lens structure, and the first insulating layer maintains a high transmittance in the direction while suppressing the transmission of light in other directions. Therefore, the light emission of the display panel presents the characteristics of high center brightness and low edge brightness, so that only observers at a specific viewing angle can see a clear image, and observers at other viewing angles can only see a blurred or dim image, realizing narrow viewing angle display. In specific implementation, by adjusting the curvature of the lens structure and the thickness distribution of the first insulating layer material, the propagation direction of the light can be accurately controlled, and the viewing angle range of the display panel can be adjusted to achieve the purpose of controlling the viewing angle.

[0062] In addition, the display panel provided by the embodiments of the present disclosure can reduce the cost and simplify the structure and mask process number of the display panel when realizing narrow viewing angle display by using the lens structure and the first insulating layer, for example: Figure 4 Compared with the display panel shown in Figure 3 The BM1 and OC1 structures are reduced, so the structure is simplified, and two masks can be reduced.

[0063] In a possible implementation, the lens structure can be implemented by a high refractive index color photoresist, for example, three kinds of hemispherical lens structures are sequentially formed above the sub-pixels R, G and B of the light emitting device layer 220, the lens structure implemented by the color photoresist can effectively prevent the reflection of ambient light on the anode and other metals after the ambient light enters the inside of the display panel, on the one hand, the single-color material allows only light of this color to pass through, and on the other hand, the hemispherical structure similar to the convex lens can effectively converge the light emitted from the inside of the display panel to the center, thereby reducing the viewing angle of the display panel.

[0064] For an RGB display panel, the light emitting colors of the sub-pixels include a first color, a second color and a third color, for example, the first color, the second color and the third color are red, green and blue respectively, assuming that the lens structures corresponding to the R, G and B sub-pixels are respectively denoted as a first color lens structure, a second color lens structure and a third color lens structure, when the lens structure is prepared by a color photoresist material, the first color lens structure can also be understood as an R color film lens, the second color lens structure can also be understood as a G color film lens, and the third color lens structure can also be understood as a B color film lens, since the R color film lens, the G color film lens and the B color film lens are completed by using three different materials and mask processes, therefore, according to the difference of the display panel light spectrum and the difference of the sub-pixel arrangement, different refractive index color film materials can be used to form lens structures with different aspect ratios. At the same time, the first color lens structure, the second color lens structure and the third color lens structure can realize the function of the color filter in the conventional technology, therefore, the color film layer can be omitted, and the structure of the display panel is simplified.

[0065] In a possible implementation, the lens layer 2510 includes a first color lens structure 2510a, a second color lens structure 2510b and a third color lens structure 2510c, and the refractive indexes of the first color lens structure 2510a, the second color lens structure 2510b and the third color lens structure 2510c are all greater than the refractive index of the first insulating layer 2520.

[0066] The first color lens structure 2510a refers to a lens structure that can only transmit first color light, the second color lens structure 2510b refers to a lens structure that can only transmit second color light, the third color lens structure 2510c refers to a lens structure that can only transmit third color light, and the refractive indexes of the first color lens structure 2510a, the second color lens structure 2510b, and the third color lens structure 2510c are all greater than the refractive index of the first insulating layer 2520. Assuming that the refractive indexes of the first color lens structure 2510a, the second color lens structure 2510b, and the third color lens structure 2510c are respectively denoted as n1, n2, and n3, and the refractive index of the first insulating layer 2520 is denoted as n4, then n1 > n4, n2 > n4, and n3 > n4 are satisfied.

[0067] Optionally, the refractive index of the third color lens structure 2510c is greater than or equal to the refractive index of the first color lens structure 2510a, and the refractive index of the third color lens structure 2510c is greater than or equal to the refractive index of the second color lens structure 2520, that is, n3 ≥ n1 and n3 ≥ n2, where n1 and n2 can be the same, or n1 can be greater than n2 or n1 can be less than n2.

[0068] In the display panel, the light-emitting efficiency of the green sub-pixel is the highest, the light-emitting efficiency of the red sub-pixel is the second, and the light-emitting efficiency of the blue sub-pixel is the lowest. In the embodiment of the present disclosure, by setting the refractive index of the third color lens structure 2510c corresponding to the blue sub-pixel to be the largest, more blue light can be converged and guided to the light-emitting side of the display panel, thereby enhancing the visibility and brightness of the blue light. At the same time, since the light-emitting efficiencies of the red sub-pixel and the green sub-pixel are close, n1 and n2 can be matched according to actual needs. It can be understood that each lens structure can select a material with a suitable refractive index according to needs, and the refractive index of each lens structure satisfies the above requirements.

[0069] Further, in an implementation manner, the refractive index of the second color lens structure 2510b is greater than or equal to the refractive index of the first color lens structure 2510a, that is, n2 ≥ n1, and at this time, n3 ≥ n2 ≥ n1 is satisfied. In the embodiment of the present disclosure, when n3 > n2 > n1, by setting the refractive indexes of different lens structures, the light extraction rates of different color sub-pixels can be changed, and then the difference degree of light-emitting brightness of different color sub-pixels can be reduced.

[0070] Optionally, the refractive index difference between the first color lens structure 2510a, the second color lens structure 2510b, and the third color lens structure 2510c and the first insulating layer 2520 is greater than or equal to 0.05 and less than or equal to 0.4.

[0071] The greater the difference in refractive index between the lens structure and the first insulating layer 2520, the more pronounced the change in refraction angle when light passes through the interface between the lens structure and the first insulating layer 2520, which can enhance the convergence effect. In other words, the lens structure has a more pronounced light converging effect. In the disclosed embodiment, when the refractive index difference between the lens structure and the first insulating layer 2520 is set between 0.05 and 0.4, an effective light converging effect can be achieved.

[0072] In one possible implementation, the aspect ratio of the third color lens structure 2510c is greater than or equal to the aspect ratio of the first color lens structure 2510a, and the aspect ratio of the third color lens structure 2510c is greater than or equal to the aspect ratio of the second color lens structure 2510b.

[0073] The aspect ratio refers to the ratio of the width W to the height H, wherein the height H refers to the maximum length in the direction perpendicular to the base substrate 210, and the width W refers to the length in the direction parallel to the base substrate 210, that is, Figure 4 The length in the X direction. Assuming that the aspect ratios of the first color lens structure 2510a, the second color lens structure 2510b, and the third color lens structure 2510c are recorded as WH(1), WH(2), and WH(3), respectively, then WH(3)≥WH(1) and WH(3)≥WH(2), that is, the aspect ratio of the lens structure corresponding to the blue sub-pixel is the largest, and the aspect ratios of the lens structures corresponding to the red sub-pixel and the green sub-pixel can be matched according to actual needs, such as being set to be the same or different.

[0074] Furthermore, the aspect ratio of the second color lens structure 2510b can be set to be greater than or equal to the aspect ratio of the first color lens structure 2510a, that is, WH(2)≥WH(1). Figure 4 In the embodiment shown, the first color lens structure 2510a, the second color lens structure 2510b, and the third color lens structure 2510c have the same aspect ratio. Figure 5 In the illustrated embodiment, the aspect ratio of the third color lens structure 2510c is greater than that of the second color lens structure 2510b, and the aspect ratio of the second color lens structure 2510b is greater than that of the first color lens structure 2510a.

[0075] Optionally, the width-height ratio of the first color lens structure 2510a, the second color lens structure 2510b, and the third color lens structure 2510c is greater than or equal to 0.2 and less than or equal to 0.5. For example, when the central height of the first color lens structure 2510a is 5 microns, the width W of the first color lens structure 2510a is greater than or equal to 1 micron and less than or equal to 2.5 microns. Similarly, when the central height of the first color lens structure 2510a is 10 microns, the width of the first color lens structure 2510a is greater than or equal to 2 microns and less than or equal to 5 microns.

[0076] In the embodiments of the present disclosure, the principle of setting the width-height ratio of different lens structures is the same as the principle of setting the refractive index of different lens structures, that is, the lower the light-emitting efficiency, the greater the refractive index and width-height ratio of the lens structure corresponding to the sub-pixel, and vice versa. The higher the light-emitting efficiency, the smaller the refractive index and width-height ratio of the lens structure corresponding to the sub-pixel. In this way, for a sub-pixel with low light-emitting efficiency, more light emitted by the sub-pixel can be collected and guided to the light-emitting side of the display panel, thereby enhancing the light-emitting brightness of the sub-pixel, and balancing the difference in display brightness caused by the difference in light-emitting efficiency of different sub-pixels.

[0077] In a possible implementation, the display panel further includes a light shielding structure 260, which is disposed on the lens layer 250 or the touch layer 240. The orthogonal projection of the light shielding structure 260 on the substrate 210 is located between the orthogonal projections of two adjacent sub-pixels on the substrate 210.

[0078] In the embodiments of the present disclosure, the light shielding structure 260 is disposed between adjacent sub-pixels. On the one hand, the light shielding structure 260 can effectively shield external light. When external light shines on the light shielding structure 260, the light shielding structure 260 can absorb or reflect most of the light, reducing the reflection of external light on the metal layer inside the display panel and reducing the reflectivity of the display panel. On the other hand, the light shielding structure 260 can avoid the mutual interference of light between adjacent sub-pixels and prevent the occurrence of color mixing. In specific implementation, the light shielding structure 260 can be implemented by a structure in the touch layer 240 or a structure in the lens layer 250.

[0079] In an implementation, as shown in FIG. 26, the display panel further includes a light shielding structure 260. The light shielding structure 260 is disposed on the lens layer 250 or the touch layer 240. The orthogonal projection of the light shielding structure 260 on the substrate 210 is located between the orthogonal projections of two adjacent sub-pixels on the substrate 210. Figure 4As shown, the light shielding structure 260 is arranged in the touch layer 240, and the first touch electrode and the second touch electrode in the touch layer 240 are made of a light shielding metal material. The first touch electrode and the second touch electrode form the light shielding structure 260. In the embodiment of the present disclosure, the touch electrode realizes the functions of the touch and the black matrix in the related art, and the BM structure is cancelled. For example, the light shielding metal material can be a black metal material. Figure 4 and Figure 5 Compared with the display panel shown in Figure 3 As shown, the light shielding structure 260 is arranged in the touch layer 240, and the first touch electrode and the second touch electrode in the touch layer 240 are made of a light shielding metal material. The first touch electrode and the second touch electrode form the light shielding structure 260. In the embodiment of the present disclosure, the touch electrode realizes the functions of the touch and the black matrix in the related art, and the BM structure is cancelled. For example, the light shielding metal material can be a black metal material.

[0080] In an implementation manner, as shown in Figure 6 The light shielding structure 260 is arranged in the lens layer 250. Specifically, the light shielding structure 260 is arranged between adjacent lens structures, and the light shielding structure 260 is a black photoresist material layer.

[0081] In the embodiment of the present disclosure, the light shielding structure 260 can be prepared by a conventional black matrix (BM) process. The material of the light shielding structure 260 is selected from conventional BM materials, for example, a black photoresist material. Optionally, the optical density (OD) value of the BM material is greater than 2, which can effectively prevent the reflection of external light on the metal material in the touch layer and the driving circuit layer. Figure 6 Compared with the display panel shown in Figure 3 Compared with the display panel shown in

[0082] In an implementation manner, as shown in Figure 7 The light shielding structure 260 includes a first film layer 2610 and a second film layer 2620 which are stacked in sequence. The first film layer 2610 is arranged in the same layer as the first color lens structure 2510a, and the second film layer 2620 is arranged in the same layer as the third color lens structure 2510c.

[0083] In the embodiment of the present disclosure, unless otherwise specified, the term "arranged in the same layer" means that two layers, components, members, elements or parts can be formed by the same preparation process (for example, a patterning process), and the two layers, components, members, elements or parts are generally formed by the same material. For example, two or more functional layers arranged in the same layer means that these functional layers arranged in the same layer can be formed by using the same material layer and the same preparation process, so that the preparation process of the display panel can be simplified.

[0084] Specifically, in the embodiments of the present disclosure, the first color lens structure 2510a is a red color film lens corresponding to a red sub-pixel, the third color lens structure 2510c is a blue color film lens corresponding to a blue sub-pixel, and the first film layer 2610 is arranged in the same layer as the first color lens structure 2510a, which means that a flat red color film layer is filled between adjacent sub-pixels while the red color film lens is prepared, and the red color film layer at the filling position has a relatively thin thickness, for example, 1-2 microns. Similarly, the second film layer 2620 is arranged in the same layer as the third color lens structure 2510c, which means that a flat blue color film layer is filled between adjacent sub-pixels while the blue color film lens is prepared, and the blue color film layer at the filling position has a relatively thin thickness, for example, 1-2 microns. When the red color film layer and the blue color film layer overlap, they can filter out red light, blue light and part of green light, achieving a technical effect similar to a black matrix BM.

[0085] In the embodiments of the present disclosure, Figure 7 Compared with the display panel shown in Figure 3 The display panel shown in

[0086] In a possible implementation, the lens structures corresponding to different sub-pixels can also be formed using high-refractive photoresist material in one mask process. For example, as shown in the figure, in this embodiment, the lens structures are first formed by one mask using high-refractive photoresist material, and then the first insulating layer is formed by one mask using low-refractive photoresist material. Figure 8 However, in this embodiment, the lens structures of different sub-pixels are formed in one mask, so the refractive index and the width-height ratio of the lens structures of different sub-pixels are exactly the same. On the one hand, they cannot be adjusted and optimized according to the light-emitting colors of the sub-pixels, and on the other hand, it is necessary to set the color film layer 280 and the planarization layer 290 above the color film layer 280, which are relatively complex in structure and process compared with the embodiment shown in Figure 4 to Figure 7

[0087] The color film layer 280 includes a plurality of black matrices BM and color filters, such as red filters R-CF, green filters G-CF and blue filters B-CF, which are arranged between adjacent black matrices BM. The OD value of the black matrix BM is greater than 2, which can effectively prevent the reflection of external light in the metal materials of the touch layer, the light-emitting device layer and the driving circuit layer. In addition, the transmittance of the color filters R-CF, G-CF and B-CF is about 60%, which can reduce the penetration of light-emitting to a certain extent, effectively reduce the reflection of natural light or external light (for example, on the metal structures of anode, gate, source and drain), and improve the visibility of the display panel.​

[0088] In a possible implementation, the display panel further includes a driving circuit layer 270 between the substrate 210 and the light-emitting device layer 220, which can also be referred to as a thin film transistor (TFT) layer. The driving circuit layer 270 can be of any structure, such as LTPS, Oxide, LTPO, etc. For example, the driving circuit layer 270 is of a LTPS structure with double-gate (Gate1 and Gate2) and double-source-drain metal layers (SD1 and SD2) in the embodiments of the present disclosure, as shown in FIG. 2B. Figure 4 As shown in FIG. 2B, the driving circuit layer 270 includes, in sequence on the substrate 210, an active layer 2710, a first gate insulating layer (GI1) 2720 covering the active layer 2710, a first gate (Gate1) 2730 formed on the first gate insulating layer 2720, a second gate insulating layer (GI2) 2740 covering the first gate 2730, a second gate (Gate2) 2750 formed on the second gate insulating layer 2740, an interlayer dielectric layer (ILD) 2760 covering the second gate 2750, a first source-drain metal layer (SD1) 2770 formed on the interlayer dielectric layer 2760, a first planarization layer (PLN1) 2780 covering the first source-drain metal layer 2770, a second source-drain metal layer (SD2) 2790 formed on the first planarization layer 2780, and a second planarization layer (PLN2) 2791 covering the second source-drain metal layer 2790. It can be understood that the driving circuit layer 270 can also be of other structures, which are not limited in the embodiments of the present disclosure.

[0089] The display panel in the embodiments of the present disclosure can be an organic light-emitting diode (OLED) display panel. It can be understood that the display panel can also be of other types according to actual needs, for example, the display panel can also be a quantum dot light emitting diode (QLED) display panel or a micro light emitting diode (Micro LED) display panel, etc.

[0090] Based on the same inventive concept, the second aspect of the present disclosure provides a display device including the display panel as described above. For example, the display device can be a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or any product or component with a display function, which is not limited in the embodiments of the present disclosure.

[0091] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not intended to limit the implementation manners of the present disclosure. Based on the above description, other different forms of changes or variations can be made by those skilled in the art, and here, all the implementation manners cannot be enumerated, and any changes or variations that are derived from the technical solutions of the present disclosure and are obvious to those skilled in the art are still within the protection scope of the present disclosure.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate substrate; a light-emitting device layer arranged on the substrate substrate, the light-emitting device layer comprising an array of pixels, each pixel comprising a pixel defining layer and a sub-pixel defined by the pixel defining layer; a package layer, a touch layer and a dimming layer arranged in sequence away from the substrate substrate on a light-emitting side of the light-emitting device layer, the dimming layer comprising a lens layer and a first insulating layer covering the lens layer, the lens layer comprising a lens structure corresponding to each sub-pixel, the light transmission color of any lens structure being the same as the light-emitting color of the corresponding sub-pixel, the refractive index of the lens structure being greater than the refractive index of the first insulating layer, and the thickness of the first insulating layer gradually increasing in a direction extending from the center position of the sub-pixel to the edge position of the sub-pixel.

2. The display panel of claim 1, wherein, The light-emitting color of the sub-pixel comprises a first color, a second color and a third color, the lens layer comprises a first color lens structure, a second color lens structure and a third color lens structure, and the refractive index of the first color lens structure, the second color lens structure and the third color lens structure is greater than the refractive index of the first insulating layer.

3. The display panel of claim 2, wherein, The first color, the second color and the third color are red, green and blue respectively, the refractive index of the third color lens structure is greater than or equal to the refractive index of the first color lens structure, and the refractive index of the third color lens structure is greater than or equal to the refractive index of the second color lens structure.

4. The display panel of claim 3, wherein, The refractive index of the second color lens structure is greater than or equal to the refractive index of the first color lens structure.

5. The display panel of claim 2, wherein, The difference between the refractive index of the first color lens structure, the second color lens structure and the third color lens structure and the refractive index of the first insulating layer is greater than or equal to 0.05 and less than or equal to 0.

4.

6. The display panel of claim 2, wherein, The first color, the second color and the third color are red, green and blue respectively, the aspect ratio of the third color lens structure is greater than or equal to the aspect ratio of the first color lens structure, and the aspect ratio of the third color lens structure is greater than or equal to the aspect ratio of the second color lens structure.

7. The display panel of claim 6, wherein, The aspect ratio of the first color lens structure, the second color lens structure and the third color lens structure is greater than or equal to 0.2 and less than or equal to 0.

5.

8. The display panel of any one of claims 2 to 7, wherein, The lens structure is a plano-convex lens, and the thickness of the plano-convex lens gradually decreases in a direction extending from the center position of the corresponding sub-pixel to the edge position of the sub-pixel.

9. The display panel of any one of claims 2 to 7, wherein, The first insulating layer is formed by photoresist material doped with first color pigment, second color pigment and third color pigment, and the transmittance of the first insulating layer to visible light is greater than or equal to 50% and less than or equal to 85%.

10. The display panel of any one of claims 2 to 7, wherein, The display panel further comprises a light shielding structure arranged on the lens layer or the touch layer, and the orthogonal projection of the light shielding structure on the substrate substrate is located between the orthogonal projections of adjacent two sub-pixels on the substrate substrate.

11. The display panel of claim 10, wherein, The touch layer comprises a first metal layer, a second insulating layer and a second metal layer which are stacked in sequence in a direction away from the substrate, a plurality of first touch electrodes are formed on the first metal layer, a plurality of second touch electrodes are formed on the second metal layer, the orthographic projection of the first touch electrodes and the second touch electrodes on the substrate is between the orthographic projection of two adjacent sub-pixels on the substrate, the first touch electrodes and the second touch electrodes adopt light shielding metal materials, and the first touch electrodes and the second touch electrodes form the light shielding structure.

12. The display panel of claim 10, wherein, The light shielding structure is arranged between adjacent lens structures, and the light shielding structure is a black photoresist layer.

13. The display panel of claim 10, wherein, The first color, the second color and the third color are red, green and blue respectively, the light shielding structure comprises a first film layer and a second film layer which are stacked in sequence, the first film layer is arranged in the same layer as the first color lens structure, and the second film layer is arranged in the same layer as the third color lens structure.

14. A display device comprising: A display panel comprising any one of claims 1 to 13.

Images