Display panel and display device

Abstract

The present invention describes a display panel and display device, comprising a light-emitting device layer located on one side of a substrate; a color-resistance layer located on a side of the light-emitting device layer away from the substrate. The color-resistance layer includes an array of color-resistance units, each comprising a first portion and a second portion, the projection of the first portion onto the light-emitting device layer being located within the pixel opening. In at least some of the color-resistance units, the thickness of the first portion in a first direction is no less than the thickness of the second portion in the first direction. By providing an auxiliary layer between at least some of the color-resistance units and the light-shielding layer, the center thickness of the color-resistance units can be more easily and controllably adjusted to be greater than or equal to their edge thickness, thereby improving brightness attenuation at wide viewing angles and reducing color shift in the viewing angle of the display panel.

Description

[0001] This application is a divisional application of application number 202011598458.3, application date December 29, 2020, and invention name "A display panel and display device". Technical Field

[0002] The present invention relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0003] Organic Light Emission Diode (OLED) displays are a new generation of display devices. Due to their advantages of being thin and light, high contrast, fast response, wide viewing angle, high brightness, and full color, they have a very broad application prospect in mobile phones, personal digital assistants (PDAs), digital cameras, car displays, laptops, wall-mounted TVs, etc.

[0004] In order to reduce the reflectivity of external light in an OLED display, a color filter is generally provided on the light-emitting surface of the OLED display. This setting can better reduce the effect of ambient light reflection in the OLED display and improve the light-emitting effect of the OLED display.

[0005] In existing technologies, integrating color filters into display panels not only improves the display panel's anti-reflection capabilities but also reduces the overall thickness of the display panel. However, conventional color filter fabrication on display panels involves first creating a black matrix (BM), then applying a color resist material to form a color resist layer. During this process, the presence of the black matrix causes the color resist material to accumulate where it overlaps the black matrix, resulting in inconsistent thickness between the center and edges of the color resist material, leading to brightness degradation due to viewing angles. Summary of the Invention

[0006] In view of this, the present invention provides a display panel and a display device, which can help balance the brightness decay rate of the viewing angle, thereby optimizing the color deviation of the viewing angle.

[0007] The present invention provides a display panel, comprising:

[0008] substrate;

[0009] a light-emitting device layer located on one side of the substrate, the light-emitting device layer comprising pixel openings arranged in an array and light-emitting devices corresponding one to one with the pixel openings, the light-emitting devices being located within the pixel openings;

[0010] a color resist layer located on a side of the light-emitting device layer away from the substrate, the color resist layer comprising color resist units arranged in an array, the color resist units comprising a first portion and a second portion, wherein a projection of the first portion on the light-emitting device layer is located within the pixel opening;

[0011] In at least some of the color resist units, the thickness of the first portion in the first direction is not less than the thickness of the second portion in the first direction, and the first direction is the light emitting direction of the display panel.

[0012] Based on the same inventive concept, the present invention further provides a display panel, comprising:

[0013] substrate;

[0014] a light-emitting device layer located on one side of the substrate, the light-emitting device layer comprising pixel openings arranged in an array and light-emitting devices corresponding one to one with the pixel openings, the light-emitting devices being located within the pixel openings;

[0015] a light shielding layer, located on a side of the light emitting device layer away from the substrate, wherein a projection of the light shielding layer on the light emitting device layer is located between adjacent pixel openings;

[0016] a color resist layer located on a side of the light-shielding layer away from the substrate, the color resist layer comprising color resist units arranged in an array, the color resist units comprising a first portion and a second portion, the second portion being located outside the first portion, and a projection of the first portion on the light-emitting device layer being located within the pixel opening;

[0017] An auxiliary layer is located between the light-shielding layer and the color-resistance layer, and the projection of the auxiliary layer on the substrate at least covers a portion of the projection of the color-resistance unit on the substrate, so that the thickness of the first portion located on the side of the auxiliary layer away from the substrate in the first direction is not less than the thickness of the second portion in the first direction, and the first direction is the light-emitting direction of the display panel.

[0018] Based on the same inventive concept, the present invention further provides a display device, comprising any display panel provided by the present invention.

[0019] Compared with the prior art, the present invention has at least one of the following outstanding advantages:

[0020] In the display panel provided by the present invention, the center thickness of at least some of the color-resistance units is greater than or equal to the edge thickness thereof, so that the light emitted by the light-emitting device in the display panel has similar brightness attenuation when it is emitted through the center of the color-resistance unit and when it is emitted through the edge of the color-resistance unit, thereby reducing the visual color deviation phenomenon of the display panel when viewing along a certain direction of the display panel.

[0021] On the other hand, an auxiliary layer can be provided between at least part of the color resist unit and the light shielding layer, which can more easily and controllably adjust the center thickness of the color resist unit to be greater than or equal to its edge thickness, thereby improving the brightness attenuation at a wide viewing angle and reducing the color deviation of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic cross-sectional view of a display panel in the prior art;

[0023] Figure 2 yes Figure 1 A partial enlarged view of area A in the middle;

[0024] Figure 3 This is a schematic diagram showing the brightness attenuation of light emitted by a light emitting device at different viewing angles;

[0025] Figure 4 A schematic diagram of an optional implementation of a display panel provided in an embodiment of the present invention;

[0026] Figure 5 for Figure 4 A local enlarged schematic diagram in FIG.

[0027] Figure 6 Schematic diagram of brightness attenuation of the first color light emitting unit 220R at different viewing angles;

[0028] Figure 7 Schematic diagram of brightness attenuation of the second color light emitting unit 220G at different viewing angles;

[0029] Figure 8 Schematic diagram of brightness attenuation of the third color light emitting unit 220B at different viewing angles;

[0030] Figure 9 A partially enlarged schematic diagram of an optional implementation manner of a display panel provided in an embodiment of the present invention;

[0031] Figure 10 A partially enlarged schematic diagram of another optional implementation manner of a display panel provided in an embodiment of the present invention;

[0032] Figure 11 A partially enlarged schematic diagram of another optional implementation manner of a display panel provided in an embodiment of the present invention;

[0033] Figure 12 A partially enlarged schematic diagram of another optional implementation manner of a display panel provided in an embodiment of the present invention;

[0034] Figure 13 A partially enlarged schematic diagram of another optional implementation manner of a display panel provided in an embodiment of the present invention;

[0035] Figure 14A partially enlarged schematic diagram of another optional implementation manner of a display panel provided in an embodiment of the present invention;

[0036] Figure 15 A partially enlarged schematic diagram of another optional implementation manner of a display panel provided in an embodiment of the present invention;

[0037] Figure 16 A schematic diagram of another optional implementation of a display panel provided in an embodiment of the present invention;

[0038] Figure 17 A schematic diagram of another optional implementation of a display panel provided in an embodiment of the present invention;

[0039] Figure 18 A schematic diagram of another optional implementation of a display panel provided in an embodiment of the present invention;

[0040] Figure 19 A schematic diagram of another optional implementation of a display panel provided in an embodiment of the present invention;

[0041] Figure 20 for Figure 19 A partially enlarged schematic diagram of an optional implementation of region B;

[0042] Figure 21 for Figure 19 A partially enlarged schematic diagram of another optional implementation of region B;

[0043] Figure 22 A schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] It should be noted that specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art can make similar generalizations without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. In addition, in the following description, the same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0046] Figure 1 is a cross-sectional schematic diagram of a display panel in the prior art. Figure 2 for Figure 1 A partial enlarged view of area A, such as Figure 1-2As shown, the display panel includes a substrate 01, a light-emitting device layer 02, a thin-film encapsulation layer 03 and a color filter stacked in sequence along a first direction X, wherein the color filter includes a light-shielding layer 04, a color-resistance layer 05 and a color-resistance flattening layer 06 stacked in sequence along the first direction X, wherein the first direction X is the light-emitting direction of the display panel.

[0047] In the prior art, the technology of directly manufacturing the color filter on the thin film encapsulation layer 03 can improve the anti-reflection capability of the display panel and reduce the thickness of the entire display panel. Figure 1-2 As shown, in the prior art, when a color filter is manufactured on a thin film encapsulation layer 03, it is necessary to first manufacture a light-shielding layer 04, and then apply a color-resist material to manufacture a color-resist layer 05. In this process, the light-shielding layer 04 is manufactured using a black light-shielding material. The light-shielding layer 04 itself has a certain thickness, which makes it easy for the color-resist material to accumulate at the position where it overlaps with the light-shielding layer 04, forming a bull's-eye defect. This also causes the thickness h2 of the color-resist unit in the center area to be smaller than the thickness h1 in the edge area.

[0048] Figure 3 This is a schematic diagram showing the brightness attenuation of light emitted by a light emitting device at different viewing angles. Figure 3 As shown, the paths of the normal-viewing light Aa and the wide-viewing light Bb emitted by the light-emitting device are different when they pass through the color-resistance unit. As can be seen from the figure, the normal-viewing light Aa emitted by light-emitting device 021 travels a distance m1 in the color-resistance layer 05, where the surface of the color-resistance layer 05 close to the substrate 01 is 05A, and the surface of the color-resistance layer 05 away from the substrate 01 is 05B. The wide-viewing light Bb emitted by light-emitting device 021 travels a distance m2 in the color-resistance layer 05, where m2>m1. Therefore, the wide-viewing light Bb travels a longer distance in the color-resistance unit, and its brightness is significantly attenuated. As a result, the brightness of the wide-viewing light Bb is lower than that of the normal-viewing light Aa, resulting in color shift in the viewing angle. The horn defect further increases the propagation distance of the wide-viewing angle light Bb in the color-resistance unit. As can be seen from the figure, after the horn defect is introduced, the surface of the color-resistance layer 05 away from the substrate 01 becomes 05B'. The propagation distance of the normal-viewing angle light Aa emitted by the light-emitting device 021 in the color-resistance layer 05 is reduced to m1', while the propagation distance of the wide-viewing angle light Bb emitted by the light-emitting device 021 in the color-resistance layer 05 is increased to m2'. In other words, m2'-m1'>m2-m1, further exacerbating the color deviation of the viewing angle.

[0049] On this basis, the applicant of this application proposed a display panel, which, on the one hand, can improve the display uniformity of the display panel and reduce the color deviation of the visual angle; on the other hand, combined with the microstructure of the display panel, it can improve the light output at a wide viewing angle on the basis of reducing the color deviation of the visual angle, thereby ensuring the light output efficiency of the display panel.

[0050] Figure 4 A schematic diagram of an optional implementation of a display panel provided in an embodiment of the present invention is shown. Figure 5 for Figure 4 A partial enlarged schematic diagram is shown in the figure.

[0051] like Figure 4 As shown, the display panel includes a substrate 100, a light-emitting device layer 200, a light-shielding layer 300, and a color resist layer 400 stacked in sequence along a first direction X; wherein the light-emitting device layer 200 is located on one side of the substrate 100, and the light-emitting device layer 200 includes an array of pixel openings 210 and light-emitting devices 220 corresponding one-to-one to the pixel openings 210, and the light-emitting devices 220 are located in the pixel openings 210; the light-emitting devices 220 can be organic light-emitting devices or inorganic light-emitting devices, which are not specifically limited here. The light-emitting devices 220 are taken as organic light-emitting devices as an example below. The light-emitting device 220 includes an anode 221, an organic light-emitting layer 222 and a cathode 223, wherein the material of the anode 221 can be ITO / Al / ITO, and the material of the cathode 223 can be Mg / Ag.

[0052] Optional, such as Figure 5 As shown, the display panel further includes a pixel definition layer 230 . The size of the pixel opening 210 generally refers to the opening size of the pixel definition layer 230 . The light-emitting device 220 is disposed in the opening of the pixel definition layer 230 to define the boundary of the light-emitting device 220 .

[0053] The light shielding layer 300 is located on a side of the light emitting device layer 200 away from the substrate 100 , and a projection of the light shielding layer 300 on the light emitting device layer 200 is located between adjacent pixel openings 210 ; the light shielding layer 300 can be made of black material.

[0054] The color resist layer 400 is located on a side of the light shielding layer 300 away from the substrate 100. The color resist layer 400 includes color resist units 410 arranged in an array. The color resist unit 410 includes a first portion 411 and a second portion 412. The projection of the second portion 412 on the substrate 100 is located outside the projection of the first portion 411 on the substrate 100. That is, it can be understood that in a color resist unit 410, the first portion 411 is located in the central area, and the second portion 412 is located in the peripheral area of ​​the first portion 411. Figure 4 Shown and Figure 5 , wherein the projection of the first portion 411 on the light-emitting device layer 200 is located within the pixel opening 210 , and the orthographic projection of the second portion 412 on the light-emitting device layer 200 at least partially does not overlap with the pixel opening 210 ;

[0055] Optionally, the color resist layer 400 further includes a color resist flattening layer 420 located on the side of the color resist unit 410 away from the substrate 100, wherein the color resist flattening layer 420 can make the surface of the color resist layer 400 away from the substrate 100 tend to be flat. In addition, the color resist flattening layer 420 can also serve as a protective layer above the color resist layer 400 to prevent the color resist unit 410 from being scratched during subsequent processes or bonding processes, thereby causing new display problems.

[0056] The auxiliary layer 500 is located between the light shielding layer 300 and the color resist layer 400. The projection of the auxiliary layer 500 on the substrate 100 at least covers a portion of the projection of the color resist unit 410 on the substrate 100. Figure 4 As shown, the auxiliary layer 500 plays a flattening role between the light-shielding layer 300 and the color-resist unit 410. This arrangement allows the lower surface of the color-resist unit 410 to be located in the same plane. During coating, the fluidity of the color-resist unit 410 on the surface of the auxiliary layer 500 improves the flatness of the color-resist unit 410. Therefore, the thickness of the first portion 411 of the color-resist unit 410 in the first direction X is equal to the thickness of the second portion 412 in the first direction X, where the first direction X is the light-emitting direction of the display panel, or the first direction X is perpendicular to the substrate. It should be noted that due to process errors, the "equal" mentioned here does not mean completely equal. It can be understood that within the range allowed by the process error, the thickness of the first portion 411 in the first direction X is approximately equal to the thickness of the second portion 412 in the first direction X.

[0057] By providing an auxiliary layer between at least part of the color resist unit and the light-shielding layer, it is possible to more easily and controllably adjust the center thickness of the color resist unit to be greater than or equal to its edge thickness, thereby reducing the aggravation of the visual color deviation phenomenon caused by the cow horn defect, thereby improving the brightness attenuation at a wide viewing angle and reducing the visual color deviation of the display panel.

[0058] Optionally, the auxiliary layer 500 includes a first auxiliary unit 510;

[0059] The light emitting device 220 includes a first color light emitting unit 220R, a second color light emitting unit 220G, and a third color light emitting unit 220B. The center wavelength of the first color is λ1, the center wavelength of the second color light emitting unit is λ2, and the center wavelength of the third color is λ3, wherein λ1>λ2>λ3;

[0060] Optionally, the central wavelength of the first color is 620-630 nm, the central wavelength of the second color is 555-585 nm, and the central wavelength of the third color is 440-480 nm.

[0061] The color resistance unit 410 includes a first color resistance sub-unit 410R. Along the first direction, the first color resistance sub-unit 410R corresponds to the first color light-emitting unit 220R one by one.

[0062] The projection of the first auxiliary unit 510 on the substrate 100 covers the projection of the first color resist sub-unit 410R on the substrate.

[0063] Figure 6 Schematic diagram of brightness attenuation of the first color light emitting unit 220R at different viewing angles. Figure 7 Schematic diagram of brightness attenuation of the second color light emitting unit 220G at different viewing angles. Figure 8 The third color light emitting unit 220B is a schematic diagram of brightness attenuation at different viewing angles. Figure 6-8 Under the same viewing angle, the first color light-emitting unit 220R has the greatest attenuation, while the second color light-emitting unit 220G and the third color light-emitting unit 220B have relatively small attenuation. Due to the inconsistent attenuation of the light-emitting units of each color, color separation is likely to occur when viewing the display panel from a certain direction, affecting the display effect.

[0064] Therefore, the applicant of this application prefers to add a first auxiliary unit 510 above the first color light-emitting unit 220R to reduce the large viewing angle brightness attenuation of the first color light-emitting unit 220R when passing through the first color color block sub-unit 410R, and at the same time balance the viewing angle brightness attenuation between the first color light-emitting unit 220R and the second color light-emitting unit 220G and the third color light-emitting unit 220B, thereby reducing the color dispersion phenomenon.

[0065] Figure 9 A partially enlarged schematic diagram of an optional implementation manner of a display panel provided in an embodiment of the present invention. Figure 10 A partially enlarged schematic diagram of another optional implementation manner of the display panel provided in an embodiment of the present invention.

[0066] Optional, such as Figure 9-10 As shown, a first groove 511 is provided on a surface of the side of the first auxiliary unit 510 away from the substrate 100; the opening of the first groove 511 faces the light-emitting surface of the display panel, and the first groove 511 has a maximum depth d in the first direction X. The existence of the first groove 511 allows the first part 411 of the color resist unit 410 to be filled into the first groove 511, which is used to increase the maximum thickness of the first part 411 in the first direction X, thereby increasing the distance that the normal viewing angle light Aa propagates in the color resist unit 410, further balancing the brightness of the normal viewing angle light Aa and the brightness of the wide viewing angle light Bb, thereby further reducing the visual color deviation.

[0067] Optional, such as Figure 9-10 As shown, the bottom surface of the first groove 511 is a smooth curved surface, or the sidewalls of the first groove 511 are multi-stepped surfaces, which are used to further adjust the thickness of the first portion 411 of the color resist unit 410 in the first direction X, making the thickness change as gradual as possible to prevent large step differences that may cause other optical effects. The maximum depth d of the first groove 511 in the first direction X can be less than or equal to the thickness of the first auxiliary unit 510 in the first direction X. Optionally, the maximum depth d is greater than or equal to the color resist unit thickness difference h1-h2 caused by the ox-horn defect.

[0068] The light shielding layer 300 includes first openings 310 arranged in an array, and the first openings 310 correspond to the pixel openings one by one and are equal in number; the projection of the first groove 511 on the light shielding layer 300 overlaps with the projection of the first color resist sub-unit 410R on the light shielding layer 300.

[0069] Optionally, the projection of the first groove 511 on the shading layer 300 covers the projection of the first part 411 of the first color resist sub-unit 410R on the shading layer 300, so that the first part 411 of the first color resist unit 410R is filled into the first groove 511, which is used to increase the maximum thickness of the first part 411 in the first direction X, increase the distance that the normal viewing angle light Aa propagates in the resist unit 410, further balance the brightness of the normal viewing angle light Aa and the brightness of the wide viewing angle light Bb, thereby further reducing the visual color deviation.

[0070] Figure 11 A partially enlarged schematic diagram of another optional implementation manner of the display panel provided in an embodiment of the present invention.

[0071] Optionally, the projection of the first groove 511 on the light shielding layer 300 at least covers the first opening 310. Figure 11 As shown, the projection of the first groove 511 on the substrate has a maximum width w2 in the second direction Y, and the first opening 310 has a maximum width w1 in the second direction Y, where w2≥w1, and the second direction is parallel to the light emitting surface of the display panel and perpendicular to the first direction X.

[0072] By increasing the maximum width of the projection of the first groove 511 on the substrate 100 in the second direction Y, the overlapping area between the first groove 511 and the color resist unit 410 can be increased, which can be used to further adjust the thickness of the color resist unit 410 in the first direction X, so that the adjustable viewing angle color deviation range is larger, that is, the angle θ between the wide viewing angle light Bb and the normal viewing angle light Aa is increased.

[0073] Optionally, the projection center of the first groove 511 on the light-shielding layer 300 overlaps with the projection center of the first color resist sub-unit 410R on the light-shielding layer 300. That is, in the first direction X, the point where the depth of the first groove 511 varies the most overlaps with the center position of the first color resist sub-unit 410R. The center position may be the geometric center or center of gravity of the first color resist sub-unit 410R, which is not specifically limited herein. It is understood that, within a certain process tolerance, the closer the point where the depth of the first groove 511 varies the most overlaps with the center position of the first color resist sub-unit 410R, the better the effect of improving the visual color skewness.

[0074] Figure 12 A partially enlarged schematic diagram of another optional implementation manner of the display panel provided in an embodiment of the present invention.

[0075] Optionally, the display panel includes a touch function layer 600, which is located between the light shading layer 300 and the light emitting device layer 200. The touch function layer 600 includes a touch electrode 610 and a touch insulation layer 620 between the touch electrode 610. The projection of the light shading layer 300 on the substrate 100 covers the projection of the touch electrode 610 on the substrate 100.

[0076] The touch electrodes 610 include sensing touch electrodes and driving touch electrodes (not labeled in the figure), which together implement the touch function of the display panel. The touch insulation layer 620 is used to insulate the sensing touch electrodes from the driving touch electrodes. Optionally, the touch function layer 600 includes a touch buffer layer 630 near the side of the light-emitting device layer 200 to support the touch electrodes 610 and provide a preparation environment for directly integrating the touch electrodes 610 with the display panel. Optionally, the touch buffer layer 630 is an inorganic layer.

[0077] Due to the presence of the touch electrode 610, the thickness of the light shielding layer 300 increases. Therefore, perpendicular to the substrate direction, optionally, the thickness of at least part of the first auxiliary unit 510 is greater than or equal to the thickness of the light shielding layer 300, and the maximum thickness of the first auxiliary unit 510 is greater than or equal to the thickness of the light shielding layer 300. Figure 12As shown, when the maximum thickness of the first auxiliary unit 510 is equal to the thickness of the light-shielding layer 300, the first auxiliary unit 510 is completely located in the first opening 310 of the light-shielding layer 300, so that the thickness of the first part 411 located on the side of the first auxiliary unit 510 away from the substrate in the first direction X is not less than the thickness of the second part 412 in the first direction X, and at the same time, the thickness of the film layer on the display panel in the first direction X is reduced, ensuring that the final thickness of the entire display panel is not affected while the auxiliary layer 500 is added, thereby meeting the requirements of lightness and thinness in the design of the display panel.

[0078] Optionally, the refractive index of the first auxiliary unit 510 is smaller than the refractive index of the first color resist sub-unit 410R. By setting the difference between the refractive index of the first color resist sub-unit 410R and the refractive index of the first auxiliary unit 510, a refractive index change structure can be formed at the contact interface between the first color resist sub-unit 410R and the first auxiliary unit 510, which is used to improve the light extraction efficiency of the first color light-emitting unit 220R.

[0079] Optionally, a surface of the first auxiliary unit 510 facing the color resist layer 400 includes a first area and a second area. Along the first direction X, the first area corresponds to the first portion 411, and the second area corresponds to the second portion 412. The hydrophilicity of the first area is greater than that of the second area.

[0080] Figure 13 A partially enlarged schematic diagram of another optional implementation manner of the display panel provided in an embodiment of the present invention.

[0081] Optional, such as Figure 13 As shown, a hydrophilic material layer 512 can be coated on the first area. Due to the effect of the hydrophilic material layer 512, the color resist material at the first part 411 will be more easily aggregated to form a protruding structure, so that the thickness of the first part 411 in the first direction X is not less than the thickness of the second part 412 in the first direction X.

[0082] Optionally, the hydrophilic material layer 512 may also be coated on the surface of the first groove 511 , which can be used to further adjust the thickness of the color resist unit 410 in the first direction X. The principle is similar to the aforementioned optional solution and will not be repeated here.

[0083] Figure 14 A partially enlarged schematic diagram of another optional implementation manner of the display panel provided in an embodiment of the present invention.

[0084] Optional, such as Figure 14As shown, there is at least a hydrophilic portion 513 in the first auxiliary unit 510. In the first direction X, the hydrophilic portion 513 overlaps with the first portion 411. The side of the hydrophilic portion 513 away from the substrate 100 has a hydrophilic surface 513a. Due to the effect of the hydrophilic surface 513a, the color resist material at the first portion 411 will be more easily aggregated to form a protruding structure, so that the thickness of the first portion 411 in the first direction X is not less than the thickness of the second portion 412 in the first direction X.

[0085] Optionally, the first groove 511 may also be provided on the hydrophilic portion 513 . The principle thereof is similar to that of the aforementioned optional solution and will not be described in detail here.

[0086] Figure 15 A partially enlarged schematic diagram of another optional implementation manner of the display panel provided in an embodiment of the present invention.

[0087] Optional, such as Figure 15 As shown, scattering particles 514 are doped inside the first auxiliary unit 510. The particle size of the scattering particles 514 is preferably 600±100μm, and the material can be metal oxide and high-refractive-index organic material. The refractive index n of the scattering particles 514 is greater than 1.5, which is used to improve the light extraction efficiency of the first color light-emitting unit 220R.

[0088] Optionally, the projection of the scattering particles 514 on the light shielding layer 300 completely falls into the first opening 310 , so that the scattering efficiency in this range is high and the transmittance loss is small.

[0089] Figure 16 A schematic diagram of another optional implementation manner of the display panel provided in an embodiment of the present invention.

[0090] Based on the same inventive concept, the present invention also provides a display panel, such as Figure 16 As shown, the display panel includes a substrate 100, a light-emitting device layer 200, a light-shielding layer 300, and a color resist layer 400 stacked in sequence along a first direction X; wherein the light-emitting device layer 200 is located on one side of the substrate 100, and the light-emitting device layer 200 includes an array of pixel openings 210 and light-emitting devices 220 corresponding one-to-one to the pixel openings 210, and the light-emitting devices 220 are located in the pixel openings 210; the light-emitting devices 220 can be organic light-emitting devices or inorganic light-emitting devices, which are not specifically limited here. The light-emitting devices 220 are taken as organic light-emitting devices as an example below. The light-emitting device 220 includes an anode 221, an organic light-emitting layer 222 and a cathode 223, wherein the material of the anode 221 can be ITO / Al / ITO, and the material of the cathode 223 can be Mg / Ag.

[0091] Optionally, the display panel further includes a pixel definition layer 230 , the size of the pixel opening 210 generally refers to the opening size of the pixel definition layer 230 , and the light-emitting device 220 is disposed in the opening of the pixel definition layer 230 to define the boundary of the light-emitting device 220 .

[0092] The light shielding layer 300 is located on a side of the light emitting device layer 200 away from the substrate 100 , and a projection of the light shielding layer 300 on the light emitting device layer 200 is located between adjacent pixel openings 210 ; the light shielding layer 300 can be made of black material.

[0093] The color resist layer 400 is located on a side of the light shielding layer 300 away from the substrate 100. The color resist layer 400 includes color resist units 410 arranged in an array. The color resist unit 410 includes a first portion 411 and a second portion 412. The projection of the second portion 412 on the substrate 100 is located outside the projection of the first portion 411 on the substrate 100. That is, it can be understood that in a color resist unit 410, the first portion 411 is located in the central area, and the second portion 412 is located in the peripheral area of ​​the first portion 411. Figure 4 As shown, the projection of the first portion 411 on the light-emitting device layer 200 is located within the pixel opening 210;

[0094] Optionally, the color resist layer 400 further includes a color resist flattening layer 420 located on the side of the color resist unit 410 away from the substrate 100, wherein the color resist flattening layer 420 can make the surface of the color resist layer 400 away from the substrate 100 tend to be flat. In addition, the color resist flattening layer 420 can also serve as a protective layer above the color resist layer 400 to prevent the color resist unit 410 from being scratched during subsequent processes or bonding processes, thereby causing new display problems.

[0095] The auxiliary layer 500 is located between the light shielding layer 300 and the color resist layer 400. Figure 16As shown, the projection of the auxiliary layer 500 on the substrate 100 completely covers the projection of the color resist layer 400 on the substrate 100. The auxiliary layer 500 plays a flat role between the light-shielding layer 300 and the color resist unit 410. This arrangement can make the lower surface of the color resist unit 410 located in the same plane. During coating, the fluidity of the color resist unit 410 on the surface of the auxiliary layer 500 makes the color resist unit 410 more flat. Therefore, the thickness of the first portion 411 of the color resist unit 410 in the first direction X is equal to the thickness of the second portion 412 in the first direction X, where the first direction X is the light emitting direction of the display panel. It should be noted that due to the existence of process errors, the equal mentioned here is not completely equal. It can be understood that within the range allowed by the process error, the thickness of the first portion 411 in the first direction X is approximately equal to the thickness of the second portion 412 in the first direction X.

[0096] By providing an auxiliary layer 500 between the color resist unit and the light shielding layer, it is possible to more easily and controllably adjust the center thickness of the color resist unit to be greater than or equal to its edge thickness, thereby reducing the aggravation of the visual color deviation phenomenon caused by the cow horn defect, thereby improving the brightness attenuation at a wide viewing angle and reducing the visual color deviation of the display panel.

[0097] See also Figure 6-8 , under the same viewing angle condition, the attenuation degree of the first color light emitting unit 220R is the largest, and the attenuation degree of the second color light emitting unit 220G and the third color light emitting unit 220B is relatively small. Although the applicant of this application prefers to add an auxiliary layer 500 above the first color light emitting unit 220R, Figure 7 and 8 As can be seen in the figure, the second and third color light-emitting cells 220G and 220B also experience some attenuation, but the degree of attenuation is not as significant as that of the first color light-emitting cell 220R. Therefore, the color resist cells above the second and third color light-emitting cells 220G and 220B can also be improved. It is understandable that because the attenuation of the second and third color light-emitting cells 220G and 220B is relatively small, even if the color resist cells above the second and third color light-emitting cells 220G and 220B are improved, the improvement in reducing the visual color shift is far less significant than when the color resist cells above the first color light-emitting cell 220R are improved. However, improving the color resist cells above the first color light-emitting cell 220R at the same time as the color resist cells above the second and third color light-emitting cells 220G and 220B can simplify the process and reduce costs without affecting the effect of reducing the visual color shift.

[0098] Figure 17A schematic diagram of another optional implementation manner of the display panel provided in an embodiment of the present invention.

[0099] Optional, such as Figure 17 As shown, a first groove 511 is provided on a surface of the auxiliary layer 500 away from the substrate 100;

[0100] The light emitting device 220 includes a first color light emitting unit 220R, a second color light emitting unit 220G, and a third color light emitting unit 220B. The center wavelength of the first color is λ1, the center wavelength of the second color light emitting unit is λ2, and the center wavelength of the third color is λ3, wherein λ1>λ2>λ3;

[0101] Optionally, the central wavelength of the first color is 620-630 nm, the central wavelength of the second color is 555-585 nm, and the central wavelength of the third color is 440-480 nm.

[0102] The color resistance unit 410 includes a first color resistance sub-unit 410R. Along the first direction, the first color resistance sub-unit 410R corresponds to the first color light-emitting unit 220R one by one.

[0103] The light-shielding layer 300 includes first openings 310 arranged in an array, and the first openings 310 correspond one-to-one to the pixel openings 210 and are equal in number; generally speaking, in the first direction X shown, in order to ensure light extraction efficiency, the size of the first openings 310 is larger than the size of the pixel openings 210, and the first openings 310 do not overlap with the pixel openings 210.

[0104] The projection of the first groove 511 on the light-shielding layer 300 overlaps with the projection of the first color resist sub-unit 410R on the light-shielding layer 300. Furthermore, the first groove 511 has a maximum depth d1 in the first direction X. The presence of the first groove 511 allows the first portion 411 of the color resist unit 410 to fill the first groove 511, thereby increasing the maximum thickness of the first portion 411 in the first direction X. This increases the distance that the normal viewing angle light Aa travels in the color resist unit 410, further balancing the brightness of the normal viewing angle light Aa with the brightness of the wide viewing angle light Bb, thereby further reducing visual color deviation.

[0105] Optionally, the bottom surface of the first groove 511 is a smooth curved surface, or the sidewalls of the first groove 511 are multi-stepped surfaces, to further adjust the thickness of the first portion 411 of the color resist unit 410 in the first direction X, making its thickness variation as gradual as possible and preventing large step differences that could cause other optical effects. The first groove 511 has a maximum depth d1 in the first direction X that can be less than or equal to the thickness of the first auxiliary unit 510 in the first direction X. Optionally, the maximum depth d1 is greater than or equal to the color resist unit thickness difference h1-h2 caused by the ox-horn defect.

[0106] Optionally, the projection of the first groove 511 on the shading layer 300 covers the projection of the first part 411 of the first color resist sub-unit 410R on the shading layer 300, so that the first part 411 of the first color resist unit 410R is filled into the first groove 511, which is used to increase the maximum thickness of the first part 411 in the first direction X, increase the distance that the normal viewing angle light Aa propagates in the resist unit 410, further balance the brightness of the normal viewing angle light Aa and the brightness of the wide viewing angle light Bb, thereby further reducing the visual color deviation.

[0107] Optionally, the projection of the first groove 511 on the light-shielding layer 300 covers at least the first opening 310, and the projection of the first groove 511 on the substrate has a maximum width w2 in the second direction Y, and the first opening 310 has a maximum width w1 in the second direction Y, where w2 ≥ w1, and the second direction is parallel to the light-emitting surface of the display panel and perpendicular to the first direction X.

[0108] By increasing the maximum width of the projection of the first groove 511 on the substrate 100 in the second direction Y, the overlapping area between the first groove 511 and the color resist unit 410 can be increased, which can be used to further adjust the thickness of the color resist unit 410 in the first direction X, so that the adjustable viewing angle color deviation range is larger, that is, the angle θ between the wide viewing angle light Bb and the normal viewing angle light Aa is increased.

[0109] Optionally, the projection center of the first groove 511 on the light-shielding layer 300 overlaps with the projection center of the first color resist sub-unit 410R on the light-shielding layer 300. That is, in the first direction X, the point where the depth of the first groove 511 varies the most overlaps with the center position of the first color resist sub-unit 410R. The center position may be the geometric center or center of gravity of the first color resist sub-unit 410R, which is not specifically limited herein. It is understood that, within a certain process tolerance, the closer the point where the depth of the first groove 511 varies the most overlaps with the center position of the first color resist sub-unit 410R, the better the effect of improving the visual color skewness.

[0110] Continue to see Figure 17 The auxiliary layer 500 is further provided with a second groove 515 and a third groove 516 on a side surface away from the substrate 100;

[0111] The color resistance unit 410 further includes a second color resistance sub-unit 410G and a third color resistance sub-unit 410B. Along the first direction X, the second color resistance sub-unit 410G corresponds one-to-one with the second color light-emitting unit 220G, and the third color resistance sub-unit 410B corresponds one-to-one with the third color light-emitting unit 220B.

[0112] The projection of the second groove 515 on the light shielding layer 300 overlaps with the projection of the second color resist sub-unit 410G on the light shielding layer 300;

[0113] The projection of the third groove 516 on the light shielding layer 300 overlaps with the projection of the third color resist sub-unit 410B on the light shielding layer 300 .

[0114] The second groove 515 has a maximum depth d2 in the first direction X, and the third groove 516 has a maximum depth d3 in the first direction X, which is used to increase the maximum thickness of the first portion 411 in the first direction X, thereby increasing the distance that the normal viewing angle light Aa propagates in the color resist unit 410, further balancing the brightness of the normal viewing angle light Aa and the brightness of the wide viewing angle light Bb, thereby further reducing the color deviation of the viewing angle.

[0115] See also Figure 6-8 Under the same viewing angle, the attenuation degree of the first color light emitting unit 220R is the largest, while the attenuation degree of the second color light emitting unit 220G and the third color light emitting unit 220B is relatively small. Therefore, the maximum depth of the first groove 511, the second groove 515 and the third groove 516 in the first direction X can be set to meet h1>h2, or h1 is greater than h3. Figure 7-8 Since the attenuation degrees of the second color light emitting unit 220G and the third color light emitting unit 220B are relatively similar, in order to further simplify the process, the maximum depths of the first groove 511, the second groove 515 and the third groove 516 in the first direction X can be set to satisfy h1>h2=h3.

[0116] Optionally, the bottom surfaces of the second groove 515 and the third groove 516 may also be smooth curved surfaces, or the side walls of the second groove 515 and the third groove 516 may be multi-step surfaces, for further adjusting the thickness of the first portion 411 in the color resist unit 410 in the first direction X, so that the thickness changes as gradually as possible to prevent large step differences from causing other optical effects.

[0117] Optionally, other optional implementations of the first groove 511 can also be used to improve the second groove 515 and the third groove 516. The principles and effects are similar and will not be repeated here.

[0118] Figure 18 A schematic diagram of another optional implementation manner of the display panel provided in an embodiment of the present invention.

[0119] Optionally, the display panel includes a touch function layer 600, which is located between the light shading layer 300 and the light emitting device layer 200. The touch function layer 600 includes a touch electrode 610 and a touch insulation layer 620 between the touch electrode 610. The projection of the light shading layer 300 on the substrate 100 covers the projection of the touch electrode 610 on the substrate 100.

[0120] The touch electrodes 610 include sensing touch electrodes and driving touch electrodes (not labeled in the figure), which together implement the touch function of the display panel. The touch insulation layer 620 is used to insulate the sensing touch electrodes from the driving touch electrodes. Optionally, the touch function layer 600 includes a touch buffer layer 630 near the side of the light-emitting device layer 200 to support the touch electrodes 610 and provide a preparation environment for directly integrating the touch electrodes 610 with the display panel. Optionally, the touch buffer layer 630 is an inorganic layer.

[0121] Due to the presence of the touch electrode 610, the thickness of the light shielding layer 300 increases, so perpendicular to the substrate direction, optionally, the thickness of at least part of the auxiliary layer 500 is greater than or equal to the thickness of the light shielding layer 300, and the maximum thickness of the auxiliary layer 500 is greater than or equal to the thickness of the light shielding layer 300, such as Figure 18 As shown, when the maximum thickness of the auxiliary layer 500 is equal to the thickness of the light-shielding layer 300, the auxiliary layer 500 is completely located in the first opening 310 of the light-shielding layer 300, so that the thickness of the first portion 411 located on the side of the auxiliary layer 500 away from the substrate in the first direction X is not less than the thickness of the second portion 412 in the first direction X, and at the same time, the thickness of the film layer on the display panel in the first direction X is reduced, ensuring that the final thickness of the entire display panel is not affected while the auxiliary layer 500 is added, thereby meeting the requirements of lightness and thinness in the design of the display panel.

[0122] Optionally, the refractive index of the auxiliary layer 500 is lower than the refractive index of the color resist layer 400. If the corresponding first color resist subunit 410R, second color resist subunit 410G, and third color resist subunit 410B in the color resist layer 400 have different refractive indices, the refractive index of the auxiliary layer 500 is lower than the one with the smallest refractive index among the first color resist subunit 410R, the second color resist subunit 410G, and the third color resist subunit 410B.

[0123] Optionally, the light-emitting device 220 includes a first color light-emitting unit 220R, a second color light-emitting unit 220G, and a third color light-emitting unit 220B, the center wavelength of the first color is λ1, the center wavelength of the second color light-emitting unit is λ2, and the center wavelength of the third color is λ3, wherein λ1>λ2>λ3;

[0124] Optionally, the central wavelength of the first color is 620-630 nm, the central wavelength of the second color is 555-585 nm, and the central wavelength of the third color is 440-480 nm.

[0125] The color resistance unit 410 includes a first color resistance sub-unit 410R. Along the first direction, the first color resistance sub-unit 410R corresponds to the first color light-emitting unit 220R one by one.

[0126] The auxiliary layer 500 is provided with a first region and a second region on a surface of a side away from the substrate, wherein the second region is located outside the first region, and along the first direction, the first region corresponds to the first portion 411;

[0127] The hydrophilicity of the first region is greater than that of the second region.

[0128] Optionally, a hydrophilic material layer may be coated on the first area, or a hydrophilic portion may be provided in the area of ​​the auxiliary layer 500 corresponding to the first portion 411 . The principle and effect are similar to those of the aforementioned optional embodiment and will not be described in detail here.

[0129] Optionally, scattering particles are doped in the auxiliary layer 500, and the projection of the scattering particles on the substrate 100 overlaps with the projection of the first color resist subunit 410R on the substrate 100. The principle and effect are similar to those of the aforementioned optional embodiment and are not described in detail here.

[0130] Figure 19 A schematic diagram of another optional implementation of a display panel provided in an embodiment of the present invention; Figure 20 for Figure 19 A partially enlarged schematic diagram of an optional implementation of area B.

[0131] Optional, see Figure 19-20 A fourth groove 517 is provided on the surface of the auxiliary layer 500 on a side away from the substrate 100. The projection of the light-shielding layer 300 on the auxiliary layer 500 covers the fourth groove 517, and the projection of the color-resist unit 410 on the auxiliary layer 500 at least partially overlaps with the fourth groove 517. The fourth groove 517 can accommodate excess color-resist material at the edge of the color-resist unit 410, preventing accumulation of color-resist material at the edge of the color-resist unit 410. This can reduce or even completely eliminate the horn defect at the edge of the color-resist unit 410, further ensuring that the center thickness of the color-resist unit is greater than or equal to its edge thickness, reducing the aggravation of the visual color shift caused by the horn defect, thereby improving brightness attenuation at a wide viewing angle and reducing the visual color shift of the display panel.

[0132] Figure 21 for Figure 19 A partially enlarged schematic diagram of another optional implementation of area B.

[0133] Optional, see Figure 21 A fifth groove 518 is provided on a surface of the light shielding layer 300 facing away from the substrate 100; along the first direction X, the fifth groove 518 at least partially overlaps with the fourth groove 517. Providing the fifth groove 518 on the light shielding layer 300 increases redundant space at the edge of the color resist unit 410, further preventing accumulation of color resist material at the edge of the color resist unit 410. Furthermore, the presence of the fourth and fifth grooves 517, 518, can reduce or even completely eliminate the occurrence of horn defects at the edge of the color resist unit 410, thereby further ensuring that the center thickness of the color resist unit is greater than or equal to its edge thickness. This reduces the exacerbation of the visual color deviation caused by horn defects, thereby improving brightness attenuation at wide viewing angles and reducing the visual color deviation of the display panel.

[0134] The present invention also provides a display device, Figure 22 Schematic diagram of a display device according to an embodiment of the present invention. The display device includes a display panel according to any embodiment of the present invention. Display devices provided by the present invention include, but are not limited to, televisions, laptops, desktop monitors, tablet computers, digital cameras, mobile phones, smart bracelets, smart glasses, in-vehicle displays, medical equipment, industrial control equipment, touch-screen interactive terminals, and the like.

[0135] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A display panel, characterized in that: include: substrate; a light-emitting device layer, located on one side of the substrate, the light-emitting device layer comprising a pixel opening and a light-emitting device, wherein the light-emitting device is located in the pixel opening; a color resist layer located on a side of the light-emitting device layer away from the substrate, the color resist layer comprising a color resist unit, at least part of the color resist unit comprising a first portion and a second portion, an orthographic projection of the first portion on the light-emitting device layer being located within the pixel opening; The thickness of the first portion in at least some of the color resist units in a first direction is not less than the thickness of the second portion in the first direction, and the first direction is perpendicular to the substrate; a light shielding layer, located on a side of the color resist layer close to the substrate, wherein an orthographic projection of the light shielding layer on the light emitting device layer is located between adjacent pixel openings; an auxiliary layer, located between the color resist layer and the light emitting device layer; The auxiliary layer includes a first auxiliary unit; The light emitting device includes a first color light emitting unit, a second color light emitting unit and a third color light emitting unit, the center wavelength of the first color is λ1, the center wavelength of the second color is λ2, and the center wavelength of the third color is λ3, wherein λ1>λ2>λ3; The color resistance unit includes a first color resistance sub-unit, and along the first direction, the first color resistance sub-unit corresponds to the first color light-emitting unit; The orthographic projection of the first auxiliary unit on the substrate covers the orthographic projection of the first color resist sub-unit on the substrate; A first groove is provided on a surface of the first auxiliary unit on a side away from the substrate; The light shielding layer includes a first opening, and the first opening corresponds to the pixel opening; An orthographic projection of the first groove on the light shielding layer overlaps with an orthographic projection of the first color resist sub-unit on the light shielding layer.

2. The display panel according to claim 1, wherein Also includes: The orthographic projection of the auxiliary layer on the substrate at least covers a portion of the orthographic projection of the color resist unit on the substrate.

3. The display panel according to claim 1, wherein At least a portion of the first portion fills the first groove.

4. The display panel according to claim 1, wherein: The orthographic projection of the first groove on the light shielding layer at least covers the first opening.

5. The display panel according to claim 1, wherein A projection center of the first groove on the light shielding layer overlaps with a projection center of the first color resist sub-unit on the light shielding layer.

6. The display panel according to claim 1, wherein: The bottom surface of the first groove is a curved surface or the sidewall of the first groove is a multi-step surface.

7. The display panel according to claim 1, wherein: Along the first direction, a thickness of at least a portion of the first auxiliary units is greater than or equal to a thickness of the light shielding layer.

8. The display panel according to claim 1, wherein: The refractive index of the first auxiliary unit is smaller than the refractive index of the first color resistor sub-unit.

9. The display panel according to claim 1, wherein: The first auxiliary unit is doped with scattering particles.

10. The display panel according to claim 1, wherein The orthographic projection of the auxiliary layer on the substrate completely covers the orthographic projection of the color resist layer on the substrate.

11. The display panel according to claim 10, wherein: A second groove and a third groove are further provided on a surface of the auxiliary layer away from the substrate; The color resistance unit further includes a second color resistance sub-unit and a third color resistance sub-unit. Along the first direction, the second color resistance sub-unit corresponds to the second color light-emitting unit, and the third color resistance sub-unit corresponds to the third color light-emitting unit. The orthographic projection of the second groove on the light shielding layer overlaps with the orthographic projection of the second color resist sub-unit on the light shielding layer; An orthographic projection of the third groove on the light shielding layer overlaps with an orthographic projection of the third color resist sub-unit on the light shielding layer.

12. The display panel according to claim 11, wherein: Along the first direction, the depth h1 of the first groove is greater than the depth h2 of the second groove or the depth h1 of the first groove is greater than the depth h3 of the third groove.

13. The display panel according to claim 11, wherein: The bottom surface of the second groove and / or the third groove is a curved surface, or the sidewall of the second groove and / or the third groove is a multi-step surface.

14. The display panel according to claim 10, wherein: Along the first direction, the thickness of at least a portion of the auxiliary layer is greater than or equal to the thickness of the light shielding layer.

15. The display panel according to claim 10, wherein: The refractive index of the auxiliary layer is smaller than the refractive index of the color resist layer.

16. The display panel according to claim 10, wherein: Scattering particles are doped inside the auxiliary layer, and the orthographic projection of the scattering particles on the substrate overlaps with the orthographic projection of the first color resist subunit on the substrate.

17. The display panel according to claim 10, wherein: A fourth groove is provided on a surface of the auxiliary layer on a side away from the substrate; The projection of the light shielding layer on the auxiliary layer covers the fourth groove.

18. The display panel according to claim 17, wherein: A fifth groove is provided on a surface of the light shielding layer on a side away from the substrate; Perpendicular to the substrate direction, the fifth groove at least partially overlaps with the fourth groove.

19. The display panel according to claim 1, wherein: An orthographic projection of the second portion on the light-emitting device layer at least partially does not overlap with the pixel opening.

20. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 19.

Images