A display panel and display device

Abstract

The application discloses a display panel and a display device, the display panel comprises first and second color filter units with different filter colors and first and second light emitting elements with different light emitting materials, the first color filter unit comprises a blue color filter unit; the first color filter unit is located on the side of the second color filter unit away from the light emitting element and overlaps with the gap between two adjacent second color filter units; part of the light emitted by the first opening of the first light emitting element is incident to the second color filter unit; part of the light emitted by the second opening of the second light emitting element is incident to the first color filter unit, and the width of the first opening part is smaller than that of the second opening part. Thus, a smaller part of the light emitted by the first light emitting element is filtered by the second color filter unit, and a larger part of the light emitted by the second light emitting element is filtered by the first color filter unit, so that the spectral energy of the light at different viewing angles can be adjusted, and the color cast problem of the display panel is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display panel and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are devices that generate electroluminescence using a multilayer organic thin-film structure. They have advantages such as self-emission, short response time, high luminous efficiency, high brightness, and wide viewing angle, making OLEDs very prominent in display applications.

[0003] Figure 1 This is a schematic diagram showing the normalized tristimulus values ​​of the R, G, and B color coordinates of an OLED display panel in the prior art. Figure 1 The curve in the figure represents a schematic curve showing how the relative proportions of the normalized tristimulus values ​​of the chromatic coordinates of R, G, and B change with viewing angle. As can be seen from the figure, the three colors R, G, and B deviate significantly with increasing viewing angle. Because the human eye has a relatively small tolerance range for white color difference, this color cast is easily noticeable.

[0004] Therefore, how to adjust the viewing angle of different emitted light colors to improve the color cast problem of display panels has become a research hotspot. Summary of the Invention

[0005] The present invention provides a display panel and a display device, which improves the color deviation problem of the display panel by adjusting the light-emitting area blocked by the color filter unit in different light-emitting elements, thereby adjusting the spectral energy of light at different viewing angles.

[0006] In a first aspect, the present invention provides a display panel comprising a plurality of light-emitting elements and a plurality of color filter units;

[0007] The color filter unit includes a first color filter unit and a second color filter unit. The first color filter unit includes a blue color filter unit, and the filter color of the second color filter unit is different from the filter color of the first color filter unit.

[0008] The first color filter unit is located on the side of the second color filter unit away from the light-emitting element, and a planarization layer is spaced between the first color filter unit and the second color filter unit. Along the light emission direction, the gap between the first color filter unit and the gap between two adjacent second color filter units overlaps.

[0009] The light-emitting element includes a first light-emitting element and a second light-emitting element. The first light-emitting element emits blue light, and the light-emitting materials of the first light-emitting element and the second light-emitting element are different.

[0010] Along the light emission direction, the first color filter unit overlaps with the first light-emitting element, and the second color filter unit overlaps with the second light-emitting element;

[0011] The first light-emitting element includes a first pixel opening, the first pixel opening includes a first opening portion, and a portion of the light emitted from the first opening portion is incident on the second color filter unit; the second light-emitting element includes a second pixel opening, the second pixel opening includes a second opening portion, and a portion of the light emitted from the second opening portion is incident on the first color filter unit.

[0012] Along the first direction, the width of the first opening portion is d1, the width of the second opening portion is d2, and d2>d1; wherein, the first direction is parallel to the direction from the first light-emitting element to the second light-emitting element.

[0013] Optionally, the width of the first pixel opening is D1, the width of the second pixel opening is D2, the exit angle of the light emitted from the first light-emitting element after passing through the first color filter unit is θ1, and the exit angle of the light emitted from the second light-emitting element after passing through the second color filter unit is θ2, wherein:

[0014] [(D1-d1) / D1]*(cosθ1) 2 -(D²-d²) / D²*(cosθ²) 2 )|≤10%.

[0015] Optionally, the light emitted from the opening of the first pixel passes through the first color filter unit and is emitted into the external environment at a third angle, and the light emitted from the opening of the second pixel passes through the second color filter unit and is emitted into the external environment at the third angle.

[0016] Optionally, the display panel further includes a first planarization layer located on the side of the first color filter unit opposite to the light-emitting element, and an encapsulation layer and a second planarization layer located between the light-emitting element and the second color filter unit;

[0017] The first color filter unit includes a first surface facing the light-emitting element and a second surface away from the light-emitting element, and the second color filter unit includes a third surface facing the light-emitting element and a fourth surface away from the light-emitting element. The first surface, the second surface, the third surface and the fourth surface are all planar.

[0018] The refractive index of the first planarization layer is n1, the thickness of the encapsulation layer is d3, the thickness of the second planarization layer is d4, the distance between the first surface and the third surface along the light emission direction is d5, the distance between the first surface and the fourth surface is d6, the distance between the edge of the second pixel opening facing the first filter unit and the edge of the first filter unit facing the second pixel opening in the light emission direction is d7, and the thickness of the first color filter unit is d8.

[0019] Where, d1=tan[asin(sinθ4 / n1)]*(d3+d4+d5)-d7-d6*tan[asin(sinθ4 / n1)], θ4 is the emission angle of the light emitted by the first light-emitting element when it exits the light-emitting surface of the display panel.

[0020] d2=tan[asin(sinθ5 / n1)]*(d3+d4+d5+d8)-d7, where θ5 is the emission angle of the light emitted by the second light-emitting element when it exits the light-emitting surface of the display panel.

[0021] Optional, 0.5μm≤d5≤2μm.

[0022] Optionally, the first color filter unit includes an arc-shaped color filter unit, and the center of the first color filter unit is located on the side of the first color filter unit facing the light-emitting element;

[0023] The display panel further includes a first planarization layer located on the side of the first color filter unit away from the light-emitting element and a third planarization layer located between the film layer where the first color filter unit is located and the film layer where the second color filter unit is located.

[0024] The refractive index n1 of the first planarization layer, the refractive index n2 of the first color filter unit, and the refractive index n3 of the third planarization layer satisfy the condition n1>n2≥n3.

[0025] Optionally, the first color filter unit includes a first surface facing the first planarization layer, the maximum width of which is W. CF , of which 0 <D1≤W CF / 2.

[0026] Optionally, the first color filter unit includes a first surface facing the first planarization layer and a second surface facing the third planarization layer, wherein the maximum width of the first surface is W. CF The radius of curvature of the second surface is r, and the thickness of the first color filter unit is d8.

[0027] Among them, [0.625*(W CF–d8*2)] <r<(W CF –d8*2).

[0028] Optionally, the first color filter unit includes a first surface facing the first planarization layer, a second surface facing the third planarization layer, and a bottom surface connecting the first surface and the second surface; the distance between the light-emitting surface of the first light-emitting element and the bottom surface is H, where H satisfies 3.5μm≤H≤4μm;

[0029] The maximum width corresponding to the first surface is W CF Among them, W CF Satisfying 3μm≤W CF ≤4μm;

[0030] The thickness of the first color filter unit is d8, where d8 satisfies 0.4μm≤d8≤1μm.

[0031] Optionally, along the light emission direction of the display panel, the first color filter unit covers the gap between two adjacent second color filter units, and also covers a portion of the second color filter units disposed adjacent to the gap.

[0032] Optionally, the second color filter unit includes at least a green color filter unit.

[0033] Optionally, the display panel is a silicon-based organic light-emitting microdisplay panel.

[0034] Secondly, embodiments of the present invention also provide a display device, including the display panel described in any of the first aspects, wherein the display device is a near-eye display device.

[0035] Optionally, the display device includes a display panel, which is a silicon-based organic light-emitting microdisplay panel, and the display device also includes an optical module for near-eye display, wherein the third angle is the edge light-receiving angle of the optical module.

[0036] The technical solution of this invention includes a display panel comprising a first color filter unit and a second color filter unit with different filter colors, and a first light-emitting element and a second light-emitting element with different light-emitting materials. The first color filter unit includes a blue color filter unit. The first color filter unit is located on the side of the second color filter unit away from the light-emitting element and overlaps with the gap between two adjacent second color filter units. A portion of the light emitted from the first opening portion of the first light-emitting element is incident on the second color filter unit. A portion of the light emitted from the second opening portion of the second light-emitting element is incident on the first color filter unit, and the width of the first opening portion is smaller than the width of the second opening portion. In this way, a smaller portion of the light emitted from the first light-emitting element is filtered by the second color filter unit, and a larger portion of the light emitted from the second light-emitting element is filtered by the first color filter unit. That is, by adjusting the light-emitting area blocked by the color filter unit in different light-emitting elements, the spectral energy of the light at different viewing angles is adjusted, thereby improving the color shift problem of the display panel. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram showing the normalized tristimulus values ​​of the color coordinates of the R, G, and B colors in an OLED display panel in the prior art.

[0039] Figure 2 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention;

[0040] Figure 3 for Figure 2 A schematic diagram of the display panel along section line A-A' is provided.

[0041] Figure 4 This is a schematic diagram illustrating the decreasing trend of blue viewing angle brightness in a display panel, provided as an embodiment of the present invention.

[0042] Figure 5 This is a schematic diagram illustrating the decreasing trend of green viewing angle brightness in a display panel, provided by an embodiment of the present invention.

[0043] Figure 6 This is a schematic diagram illustrating the variation of the tristimulus values ​​XYZ with viewing angle after synthesizing white light, provided by an embodiment of the present invention.

[0044] Figure 7 This is a schematic diagram illustrating white light color cast contrast provided in an embodiment of the present invention;

[0045] Figure 8A blue spectrum of the first light-emitting element in a display panel after passing through an encapsulation layer, provided in an embodiment of the present invention;

[0046] Figure 9 An optical path diagram of a light-emitting element in a display panel provided in an embodiment of the present invention;

[0047] Figure 10 for Figure 2 Another structural schematic diagram of the provided display panel along section line A-A';

[0048] Figure 11 This is a schematic diagram illustrating the change in blue light brightness attenuation in a display panel, provided by an embodiment of the present invention.

[0049] Figure 12 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention;

[0050] Figure 13 This is a schematic diagram of another display device provided in an embodiment of the present invention. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0052] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0053] Before detailing the solutions of the embodiments of the present invention, the reasons for the significant deviation of the R, G, and B colors with increasing viewing angle caused by the microcavity effect of OLED will first be explained.

[0054] In existing technologies, color filter units of different colors are located on the same layer of the display panel. Due to the microcavity interference effect, OLED devices exhibit a strong viewing angle effect for different colors of emitted light, resulting in color cast at wide viewing angles. Since the interference effect factor differs for each wavelength, a spectral curve of the resonance factor can be plotted. However, the peak value of the resonance factor decreases at the same rate with viewing angle for different wavelengths. Ultimately, the emitted spectrum observed by the human eye equals the resonance factor multiplied by the intrinsic spectrum of the luminescent film itself. Different luminescent materials in the light-emitting element cause inconsistent peak value decreases. Therefore, the different widths of the intrinsic spectra of different luminescent materials result in different rates of decrease in the emitted spectrum. The narrower and sharper the intrinsic spectrum, the faster the emitted spectrum decreases. The full width at half maximum (FWHM) of the R and G intrinsic spectra is 50 nm, while the B intrinsic spectrum is only 30 nm, exhibiting a sharp waveform. Therefore, the peak value of the B emitted spectrum decreases faster with viewing angle than that of R and G. Thus, due to the microcavity effect of OLEDs, the R, G, and B colors deviate significantly with increasing viewing angle, resulting in a noticeable color cast.

[0055] The technical solutions of the embodiments of the present invention will be described below.

[0056] Figure 2 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention. Figure 3 for Figure 2 The provided structural schematic diagram of the display panel along section line A-A' is as follows: Figure 2 and Figure 3 As shown, the display panel 10 includes multiple light-emitting elements 100 and multiple color filter units 200; the color filter unit 200 includes a first color filter unit 201 and a second color filter unit 202. The first color filter unit 201 includes a blue color filter unit 2011, and the filter color of the second color filter unit 202 is different from the filter color of the first color filter unit 201; the first color filter unit 201 is located on the side of the second color filter unit 202 away from the light-emitting elements 100, and a planarization layer 300 is spaced between the first color filter unit 201 and the second color filter unit 202, and along the light emission direction (e.g., ...). Figure 3(As shown in the Y direction), the gaps between the first color filter unit 201 and two adjacent second color filter units 202 overlap; the light-emitting element 100 includes a first light-emitting element 101 and a second light-emitting element 102, the first light-emitting element 101 emits blue light, and the light-emitting materials of the first light-emitting element 101 and the second light-emitting element 102 are different; along the light-emitting direction Y, the first color filter unit 201 overlaps with the first light-emitting element 101, and the second color filter unit 202 overlaps with the second light-emitting element 102; the first light-emitting element 101 includes a first pixel opening, the first pixel opening includes a first opening portion 1011, and a portion of the light emitted from the first opening portion 1011 is incident on the second color filter unit 202; the second light-emitting element 102 includes a second pixel opening, the second pixel opening includes a second opening portion 1021, and a portion of the light emitted from the second opening portion 1021 is incident on the first color filter unit 201; along the first direction (as shown in the Y direction), the gaps between the first color filter unit 201 and the second color filter unit 202 overlap; along the first direction Y, ... Figure 3 (as shown in the X direction), the width of the first opening portion 1011 is d1, the width of the second opening portion 1021 is d2, and d2>d1; wherein, the first direction X is parallel to the direction from the first light-emitting element 101 to the second light-emitting element 102.

[0057] Specifically, the display panel 10 includes multiple light-emitting elements 100, which in this embodiment can be organic light-emitting diodes (OLEDs). The display panel 10 may also include display signal lines and pixel circuits. The display signal lines can be, for example, scan signal lines or data signal lines (not shown in the figure). The pixel circuits may include multiple transistors and at least one storage capacitor, such as a "2T1C" pixel circuit including two transistors and one storage capacitor, or a "5T1C" pixel circuit including five transistors and one storage capacitor. This embodiment does not limit the specific type of display signal lines or the specific structure of the pixel circuits. By electrically connecting the display signal lines and pixel circuits to the light-emitting elements, display signals are provided to the light-emitting elements 100, ensuring that the light-emitting elements 100 emit light and display normally.

[0058] For example, the color filter unit 200 can be a color filter. The color filter unit 200 can filter the light incident on it. Light with the same color as the color filter unit 200 can be emitted, while light with a different color is filtered out. In this embodiment of the invention, by setting the color filter unit 200 on the light-emitting side of the light-emitting element 100, on the one hand, the light emitted from the light-emitting element 100 can be filtered by the color filter unit 200 to improve the color purity of the light and improve the display effect of the display panel 10; on the other hand, after the ambient light is filtered by the color filter unit 200, the amount of light entering the display panel 10 can be reduced, and the ambient light reflected by the reflective structure in the display panel 10 will be further filtered and absorbed by the color filter unit 200. In this way, the emission of ambient light can be reduced, and the interference of ambient light on the normal light emission of the display panel 10 can be reduced.

[0059] Furthermore, the color filter unit 200 includes a first color filter unit 201 and a second color filter unit 202. The first color filter unit 201 includes a blue color filter unit 2011, and the second color filter unit 202 can be a red color filter unit and / or a green color filter unit. In this embodiment of the invention, the color of the second color filter unit is not specifically limited, as long as it is different from the color of the blue color filter unit 2011.

[0060] Specifically, the first color filter unit 201 is located on the side of the second color filter unit 202 that is away from the light-emitting element 100, and a planarization layer 300 is spaced between the first color filter unit 201 and the second color filter unit 202. That is, the first color filter unit 201 and the second color filter unit 202 are located in different film layers of the display panel 10, so that the first color filter unit 201 is further away from the light-emitting element 100 of the display panel 10 than the second color filter unit 202. In other words, the first color filter unit 201 is raised relative to the second color filter unit 202. Furthermore, the gaps between the first color filter unit 201 and the two adjacent second color filter units 202 overlap, meaning the blue color filter unit 2011 is located between the two adjacent second color filter units 202, and there is an overlap between the blue color filter unit 2011 and the two adjacent second color filter units 202. This allows the second-color light, filtered by the second color filter unit 202, to be filtered again by the first color filter unit 201. In other words, the viewing angle brightness of the second light-emitting element 102 can be suppressed on one side of the first color filter unit 201. Simultaneously, raising the height of the first color filter unit 201 does not affect the light emission efficiency of the first color light. This avoids color distortion caused by the peak value of the emitted spectrum from the first light-emitting element 101 decreasing faster with the viewing angle than that from the second light-emitting element 102. For example, Figure 4 This is a schematic diagram illustrating the decreasing trend of blue viewing angle brightness in a display panel, provided by an embodiment of the present invention. Figure 5 This is a schematic diagram illustrating the decreasing brightness trend of green viewing angle in a display panel, provided by an embodiment of the present invention. Figure 4 and Figure 5 As shown, along the light emission direction Y, as the height of the first color filter unit 201 (BCF) increases, the brightness of the blue viewing angle decreases in a consistent manner, but the brightness of the green viewing angle decreases more significantly. In other words, raising the height of the first color filter unit has little effect on the brightness of the blue viewing angle, but it will increase the decrease in the brightness of the green viewing angle. Therefore, by raising the height of the first color filter unit, the balance of the white light tristimulus values ​​XYZ can be achieved, thus improving the color shift problem of the display panel.

[0061] It should be noted that, in this embodiment of the invention, the second color filter unit is a green color filter unit and the second light-emitting element is a green light-emitting element as an example. It can be understood that the second color filter unit can also be a red color filter unit, and correspondingly, the second light-emitting element can be a red light-emitting element.

[0062] Furthermore, a portion of the light emitted from the first opening portion 1011 is incident on the second color filter unit 202, and a portion of the light emitted from the second opening portion 1021 is incident on the first color filter unit 201. In other words, the light emitted from the first opening portion 1011 is blocked and filtered out by the second color filter unit 202, and the light emitted from the second opening portion 1021 is also filtered out by the first color filter unit 201. Additionally, along the first direction X, the width d1 of the first opening portion 1011 and the width d2 of the second opening portion 1021 satisfy d2>d1. The portion of the second pixel opening that is blocked is greater than the portion of the first pixel opening that is blocked; that is, more light is blocked by the first color filter unit 201 than by the second color filter unit 202. In other words, a smaller portion of the light emitted from the first light-emitting element 101 is filtered out by the second color filter unit 202, while a larger portion of the light emitted from the second light-emitting element 102 is filtered out by the first color filter unit 201. This further neutralizes the color shift problem caused by the faster decrease in the peak value of the spectrum emitted by the first light-emitting element 101 with the viewing angle compared to the second light-emitting element 102. In other words, by adjusting the area of ​​light emitted by the color filter unit in different light-emitting elements, the spectral energy of the light at different viewing angles can be adjusted, thereby improving the color shift problem of the display panel.

[0063] Figure 6 This is a schematic diagram illustrating the variation of the tristimulus values ​​XYZ with viewing angle after synthesizing white light, as provided in an embodiment of the present invention. Figure 7 This is a schematic diagram illustrating white light color cast contrast, provided as an embodiment of the present invention. Figure 6 and Figure 7As shown, compared to the technical solution where the first color filter unit is not raised, after the first color filter unit (BCF) is raised by 1.7μm, the attenuation trend of R and B after the three colors of R, G and B are synthesized into white light is not obvious, but the attenuation rate of G is significantly accelerated. In other words, after the first color filter unit is raised by 1.7μm, the tristimulus values ​​XYZ of the three colors of R, G and B synthesized into white light are more balanced.

[0064] The display panel provided in this embodiment of the invention includes a first color filter unit and a second color filter unit with different filter colors, and a first light-emitting element and a second light-emitting element with different light-emitting materials. The first color filter unit includes a blue color filter unit. The first color filter unit is located on the side of the second color filter unit away from the light-emitting element and overlaps with the gap between two adjacent second color filter units. A portion of the light emitted from the first opening portion of the first light-emitting element is incident on the second color filter unit. A portion of the light emitted from the second opening portion of the second light-emitting element is incident on the first color filter unit, and the width of the first opening portion is smaller than the width of the second opening portion. In this way, a smaller portion of the light emitted from the first light-emitting element is filtered by the second color filter unit, and a larger portion of the light emitted from the second light-emitting element is filtered by the first color filter unit. That is, by adjusting the light-emitting area blocked by the color filter unit in different light-emitting elements, the spectral energy of the light at different viewing angles is adjusted, thereby improving the color shift problem of the display panel.

[0065] Optional, continue to refer to Figure 3 0.5μm≤d5≤2μm, which means that the lifting distance of the first color filter unit 201 is between 0.5μm and 2μm compared to the second color filter unit 202.

[0066] Specifically, along the light-emitting direction Y, the distance d5 between the first surface a and the third surface c needs to be greater than the maximum value of the thickness of the second color filter unit 202. For example, the thickness of the second color filter unit 202 is typically between 0.8 μm and 1.5 μm. Therefore, d5 satisfies 0.5 μm ≤ d5 ≤ 2 μm. This ensures convenient manufacturing of the display panel and, by raising the first color filter unit 201, suppresses the viewing angle brightness of the second light-emitting element 102, thereby achieving a balance of the white light tristimulus values ​​XYZ and improving the color cast problem of the display panel.

[0067] Understandably, continue to refer to Figure 5 A range of 0.5μm ≤ d5 ≤ 2μm can suppress green viewing angle brightness, and the larger the d5, the more obvious the effect. However, d5 cannot be increased indefinitely, as an excessively large d5 will cause the green viewing angle brightness to decrease too much, and color distortion will still occur. Therefore, by reasonably setting the lifting distance of the first color filter unit, the color distortion problem caused by the peak value of the emitted spectrum of the first light-emitting element decreasing with the viewing angle faster than that of the second light-emitting element can be neutralized, thus improving the color distortion problem of the display panel.

[0068] Optional, continue to refer to Figure 3 The width of the first pixel opening is D1, the width of the second pixel opening is D2, the exit angle of the light emitted from the first light-emitting element 101 after passing through the first color filter unit 201 is θ1, and the exit angle of the light emitted from the second light-emitting element 102 after passing through the second color filter unit 202 is θ2, where: [(D1-d1) / D1]*(cosθ1) 2 -(D²-d²) / D²*(cosθ²) 2 )|≤10%.

[0069] Specifically, since the width of the first pixel opening is D1 and the width of the first opening portion 1011 is d1, the light emitted from the D1-d1 region of the first pixel opening can be emitted completely without being blocked by the second color filter unit 202, and its emission angle can be θ1. The emitted light from the first light-emitting element 101 approximately satisfies the Lambertian cosine relation. That is, the luminance of the luminous area in the (D1-d1) region of the first pixel opening is [(D1-d1) / D1]*(cosθ1). 2 Similarly, the luminance within the (D2-d2) region of the second pixel opening is (D2-d2) / D2*(cosθ2). 2 .

[0070] Furthermore, since the different widths of the intrinsic spectra of R, G, and B will cause different rates of descent of the emitted spectrum, this can be addressed by setting [(D1-d1) / D1]*(cosθ1). 2 -(D²-d²) / D²*(cosθ²) 2 The brightness difference between the first light-emitting element 101 and the second light-emitting element 102 is less than or equal to 10%, which ensures that the relative proportions of the tristimulus values ​​of the color coordinates of the three colors R, G, and B are approximately consistent with the change of viewing angle after normalization, thereby further improving the color deviation problem of the display panel.

[0071] It should be noted that the exit angle θ1 of the light emitted from the first light-emitting element 101 after passing through the first color filter unit 201 can be equal to the exit angle θ2 of the light emitted from the second light-emitting element 102 after passing through the second color filter unit 202, that is, θ1=θ2.

[0072] Optional, continue to refer to Figure 3 The light emitted from the first pixel aperture passes through the first color filter unit 201 and is emitted into the external environment at a third angle, and the light emitted from the second pixel aperture passes through the second color filter unit 202 and is emitted into the external environment at a third angle.

[0073] Specifically, the light emitted from the first pixel aperture, after passing through the first color filter unit 201, and the light emitted from the second pixel aperture, after passing through the second color filter unit 202, are both emitted into the external environment at a third angle. For example, the third viewing angle matches the light-receiving angle of the optical module in the display device to ensure that the optical engine can receive the light emitted from the display panel.

[0074] For example, the third angle could be 30°.

[0075] Optional, continue to refer to Figure 3 The display panel 10 further includes a first planarization layer 301 located on the side of the first color filter unit 201 facing away from the light-emitting element 100, and an encapsulation layer 400 and a second planarization layer 302 located between the light-emitting element 100 and the second color filter unit 202; the first color filter unit 201 includes a first surface a facing the light-emitting element 100 and a second surface b facing away from the light-emitting element 100, and the second color filter unit 202 includes a third surface c facing the light-emitting element 100 and a fourth surface d facing away from the light-emitting element 100, and the first surface a, second surface b, third surface c and fourth surface d are all planar; the refractive index of the first planarization layer 301 is n1, the thickness of the encapsulation layer 400 is d3, the thickness of the second planarization layer 302 is d4, the distance between the first surface a and the third surface c along the light emission direction is d5, and the distance between the first surface a and the fourth surface d is d6. The distance in the first direction X between the edge of the pixel opening toward the second color filter unit 202 and the edge of the second color filter unit 202 toward the first pixel opening is d7. The distance in the first direction X between the edge of the second pixel opening toward the first color filter unit 201 and the edge of the first color filter unit 201 toward the second pixel opening is d8. The thickness of the first color filter unit 201 is d9. Wherein, d1=tan[asin(sinθ4 / n1)]*(d3+d4+d5)-d7-d6*tan[asin(sinθ4 / n1)], θ4 is the emission angle of the light emitted from the first light-emitting element 101 when it exits the light-emitting surface of the display panel 10; d2=tan[asin(sinθ5 / n1)]*(d3+d4+d5+d9)-d8, θ5 is the emission angle of the light emitted from the second light-emitting element 102 when it exits the light-emitting surface of the display panel 10.

[0076] Specifically, an encapsulation layer 400 is included between the light-emitting element 100 and the second color filter unit 202. The encapsulation layer 400 is used to encapsulate and protect the light-emitting element 100, preventing water vapor and oxygen from entering the light-emitting element 100 and causing water and oxygen corrosion. By setting the encapsulation unit 400, the light-emitting effect and service life of the light-emitting element 100 can be guaranteed.

[0077] Furthermore, the encapsulation layer 400 may include a "sandwich" structure of inorganic layer-organic layer-inorganic layer, where the inorganic layer filters water and oxygen and provides support and protection, while the organic layer absorbs incoming water and oxygen, thus fully ensuring the encapsulation effect of the encapsulation layer 400; alternatively, the encapsulation layer 400 may also be a structure of multiple layers of inorganic layers stacked together. For example, the encapsulation layer 400 includes thin film encapsulation (TFE).

[0078] Specifically, to isolate water and oxygen and protect the organic layer, the encapsulation layer 400 is generally thicker than 1 μm, i.e., d3 > 1 μm. This thickness of the encapsulation layer 400 will cause some interference to the light emitted from the light-emitting element 100. For example, Figure 8 This is a blue spectrum image of the first light-emitting element in a display panel after passing through an encapsulation layer, provided as an embodiment of the present invention. For example... Figure 8 As shown, when d3 = 2μm, there is a noticeable interference waveform. Raising the first color filter unit increases the thickness of the second planarization layer, strengthening the interference. However, compared to blue light, the spectrum emitted from the microcavity is very narrow. After interference filtering, the waveform of a narrow spectrum shows almost no change, as indicated by the dashed line in the figure (which almost coincides with the solid line). If a wider spectrum were to pass through interference filtering, the waveform would change to some extent. Therefore, from the perspective of interference filtering, raising the first color filter unit has very little impact on the blue light itself.

[0079] Specifically, the first planarization layer 301 and the second planarization layer 302 can be made of organic materials. By setting the first planarization layer 301 and the second planarization layer 302, a flat reference surface can be provided for subsequent OLED processes.

[0080] Specifically, Figure 9 This is an optical path diagram of a light-emitting element in a display panel provided as an embodiment of the present invention. For example... Figure 9As shown, the incident angle of the light emitted from the first light-emitting element 101 upon entering the first planarization layer 301 is θ0. After passing through the first planarization layer 301, the exit angle of the light emitted into the air is θ4. According to the law of refraction: n1sinθ0=sinθ4, it can be concluded that θ0=asin(sinθ4 / n1). Wherein, d is the area where the light emitted from the first light-emitting element 101 directly passes through the planarization layer 300 and exits into the external environment. From the trigonometric function relationship, we know that tanθ=(d+d1+d7) / (d3+d4+d5), then d+d1=tanθ*(d3+d4+d5)-d7. Since d=d6*tanθ and θ=asin(sinθ4 / n1), we can get d1=tanθ*(d3+d4+d5)-d7-d, and then we can get d1=tan[asin(sinθ4 / n1)]*(d3+d4+d5)-d7-d6*tan[asin(sinθ4 / n1)].

[0081] For details, please refer to [link / reference]. Figure 9 The light emitted from the second light-emitting element 102 is incident at an angle θ to the first planarization layer 301. After passing through the first planarization layer 301, it is refracted into the air at an exit angle θ5. According to the law of refraction: n1sinθ=sinθ5, we know that θ=asin(sinθ5 / n1). From the trigonometric function relationship, we know that d2+d8=tanθ*(d3+d4+d5+d9), therefore d2=tan[asin(sinθ5 / n1)]*(d3+d4+d5+d9)-d8.

[0082] For example, the emission angle θ4 of the light emitted by the first light-emitting element 101 when it exits the light-emitting surface of the display panel 10 can be equal to the emission angle θ5 of the light emitted by the second light-emitting element 102 when it exits the light-emitting surface of the display panel 10, that is, θ4 = θ5.

[0083] Optional, Figure 10 for Figure 2 Another structural schematic diagram of the provided display panel along section line A-A' is shown below. Figure 10 As shown, the first color filter unit 201 includes an arc-shaped color filter unit 2012, and the center O of the first color filter unit 201 is located on the side of the first color filter unit 201 facing the light-emitting element 100; the display panel 10 also includes a first planarization layer 301 located on the side of the first color filter unit 201 away from the light-emitting element 100 and a third planarization layer 303 located between the film layer where the first color filter unit 201 is located and the film layer where the second color filter unit 202 is located; wherein, the refractive index n1 of the first planarization layer 301, the refractive index n2 of the first color filter unit 201 and the refractive index n3 of the third planarization layer 303 satisfy n1>n2≥n3.

[0084] Specifically, the light emitted from the light-emitting element 100 passes through the third planarization layer 303, the first color filter unit 201, and the first planarization layer 301 in sequence before entering the external environment. Since n1>n2≥n3, the light emitted from the light-emitting element 100 bends towards the normal when it moves from a less dense medium to a denser medium, causing the light to diverge. In other words, the arc-shaped color filter unit 2012 is equivalent to a concave lens, which can slow down the attenuation rate of blue light. Figure 11 This is a schematic diagram illustrating the attenuation of blue light brightness in a display panel, provided as an embodiment of the present invention. Figure 11 As shown, compared with the existing technology where the color filter units are located in the same film layer, the present invention can slow down the attenuation rate of blue light by setting the first color filter unit as an arc-shaped color filter unit, thereby achieving the balance of the tristimulus values ​​XYZ of white light and improving the color deviation problem of the display panel.

[0085] For example, generally 1.45≤n2≤1.55, and n3 can be 1.5, which can achieve the effect of light divergence.

[0086] Optional, continue to refer to Figure 10 The first color filter unit 201 includes a first surface a facing the first planarization layer 301, and the maximum width of the first surface a is W. CF , of which 0 <D1≤W CF / 2.

[0087] Specifically, in order to balance the luminous brightness of the first light-emitting element 101 and the light-receiving angle of the optical module, a setting of 0 can be made. <D1≤W CF / 2 can balance the tristimulus values ​​of white light (XYZ), thereby improving the color deviation problem of the display panel.

[0088] For example, 0.4μm≤W CF ≤1μm.

[0089] For example, taking a light-receiving angle of 30° as an example, Table 1 shows that D1≤W CF The percentage change of the emitted light ray under the light-receiving angle at / 4. Table 2 shows the changes in the percentage of emitted light rays under the light-receiving angle when D1≤W. CF When the light collection angle is 2 / 2, the proportion of emitted light rays changes. Table 3 shows the changes in the proportion of emitted light rays under the light collection angle when D1≤3W. CF The change in the proportion of emitted light rays at a receiving angle of / 4 is shown in Tables 1-3:

[0090] Table 1

[0091]

[0092] Table 2

[0093]

[0094] Table 3

[0095]

[0096] The lens can be understood as an arc-shaped color filter unit. The distance from the light-emitting surface to the bottom of the lens can be understood as the distance between the light-emitting surface of the light-emitting element and the bottom surface of the arc-shaped color filter unit.

[0097] Specifically, as can be seen from the comparison of Tables 1-3, in order to balance the positive viewing angle and the light-receiving angle of the optical module, D1 ≤ W can be set. CF / 2. When D1>W CF At a light-receiving angle of / 2, the increase in the amount of light emitted is limited.

[0098] Optional, continue to refer to Figure 10 The first color filter unit 201 includes a first surface a facing the first planarization layer 301 and a second surface b facing the third planarization layer 303, wherein the maximum width of the first surface a is W. CF The radius of curvature of the second surface b is r, and the thickness of the first color filter unit 201 is d9; where, [0.625*(W CF –d9*2)] <r<(W CF –d9*2).

[0099] Specifically, the radius of curvature r corresponding to the second surface b satisfies [0.625*(W CF –d9*2)] <r<(W CF –d9*2), combined with the refractive index relationship between the refractive index n1 of the first planarization layer 301, the refractive index n2 of the first color filter unit 201 and the refractive index n3 of the third planarization layer 303, and the light emission angle of the first light-emitting element, it can be ensured that when the light emitted from the light-emitting element 100 passes through the third planarization layer 303, the first color filter unit 201 and the first planarization layer 301 in sequence and enters the external environment, the light will bend towards the normal, causing the light to diverge, which can slow down the attenuation rate of blue light.

[0100] For example, when r = 0.625*(W) CF When –d9*2), the refractive index of the planarization layer is between 1.6 and 1.65; when r = W CF When –d9*2, the refractive index of the planarization layer is between 1.7 and 1.8. This setting can balance the tristimulus values ​​XYZ of white light, thereby improving the color cast problem of the display panel.

[0101] Optional, continue to refer to Figure 10The first color filter unit 201 includes a first surface a facing the first planarization layer 301, a second surface b facing the third planarization layer 303, and a bottom surface connecting the first surface a and the second surface b; the distance between the light-emitting surface of the first light-emitting element 101 and the bottom surface is H, where H satisfies 3.5μm≤H≤4μm; the maximum width corresponding to the first surface a is W. CF Among them, W CF Satisfying 3μm≤W CF ≤4μm; the thickness of the first color filter unit 201 is d9, where d9 satisfies 0.4μm≤d9≤1μm.

[0102] Specifically, the distance H between the light-emitting surface and the bottom surface of the first light-emitting element 101 satisfies 3.5μm≤H≤4μm. This ensures that the distance between the first light-emitting element 101 and the first color filter unit 201 is appropriate, which reduces the loss of light emitted from the first light-emitting element 101 and makes the display panel structure compact and of moderate thickness. Furthermore, W CF Satisfying 3μm≤W CF ≤4μm, for example, W CF >D1, so that the projection of the first color filter unit 201 on the substrate of the display panel 10 covers the projection of the first light-emitting element 101 on the substrate of the display panel. This ensures that the light emitted from the first light-emitting element 101 passes through the first color filter unit 201 and is emitted into the outside world. Furthermore, the thickness d9 of the first color filter unit 201 satisfies 0.4μm≤d9≤1μm. Combined with the refractive index relationship between the refractive index n1 of the first planarization layer 301, the refractive index n2 of the first color filter unit 201 and the refractive index n3 of the third planarization layer 303, and the light emission angle of the first light-emitting element, it can be ensured that when the light emitted from the light-emitting element 100 passes through the third planarization layer 303, the first color filter unit 201 and the first planarization layer 301 in sequence and enters the external environment, the light will bend towards the normal, causing the light to diverge, which can slow down the attenuation rate of blue light.

[0103] Optional, continue to refer to Figure 3 Along the light emission direction Y of the display panel, the first color filter unit 201 covers the gap between two adjacent second color filter units 202, and also covers a portion of the second color filter units 202 that are adjacent to the gap.

[0104] Specifically, the first color filter unit 201 covers the gap between two adjacent second color filter units 202, and also covers a portion of the second color filter units 202 adjacent to the gap. That is, along the first direction X, the first color filter unit 201 overlaps with two adjacent second color filter units 202. The area covered by the first color filter unit 201 can be roughly equivalent to the black matrix (BM) of a display panel in the prior art. The BM can block light to prevent color mixing between adjacent color filter units 200. This arrangement simplifies the manufacturing process of the display panel, and the area originally designated for the BM can be used to house light-emitting elements and color filter units, increasing the pixel count of the display panel and enabling it to display images at a higher density, resulting in better display quality.

[0105] Optional, continue to refer to Figure 3 The second color filter unit 202 includes at least a green color filter unit.

[0106] Specifically, since the brightness of green light decreases the slowest and the brightness of blue light decreases the fastest due to its narrower spectrum, G and B contribute the most to the color of the synthesized white light, while R contributes the least. Therefore, the second color filter unit 202 includes at least a green color filter unit.

[0107] Specifically, the second color filter unit 202 includes at least a green color filter unit. As one possible implementation, the second color filter unit 202 may include a red color filter unit and a green color filter unit located on either side of the first color filter unit 201. As another possible implementation, the second color filter unit 202 includes a green color filter unit. Since the rate of decrease in brightness at both the red and green viewing angles is less than the rate of decrease in brightness at the blue viewing angle, setting the second color filter unit 202 to a different color than the first color filter unit 201 allows for adjustment of the spectral energy of light at different viewing angles by adjusting the light-emitting area blocked by the color filter unit in different light-emitting elements, thereby improving the color cast problem of the display panel.

[0108] Optionally, the display panel is a silicon-based organic light-emitting microdisplay panel.

[0109] Specifically, the micro-silicon circuits in silicon-based organic light-emitting microdisplay panels can independently control the emission of each pixel, ultimately forming a high-resolution, clear image on an extremely small scale. This type of display panel integrates all the functions of a large-screen display into a smaller display panel by utilizing organic light-emitting technology and microelectronics. It possesses all the functions and resolution of a large display and is widely used in infrared night vision devices and telescopes, while also being a core component in virtual reality (VR) and augmented reality (AR) scenarios.

[0110] In summary, the display panel provided in this embodiment of the invention includes a first color filter unit and a second color filter unit with different filter colors, and a first light-emitting element and a second light-emitting element with different light-emitting materials. The first color filter unit includes a blue color filter unit. The first color filter unit is located on the side of the second color filter unit away from the light-emitting element and overlaps with the gap between two adjacent second color filter units. A portion of the light emitted from the first opening portion of the first light-emitting element is incident on the second color filter unit. A portion of the light emitted from the second opening portion of the second light-emitting element is incident on the first color filter unit, and the width of the first opening portion is smaller than the width of the second opening portion. In this way, a smaller portion of the light emitted from the first light-emitting element is filtered by the second color filter unit, and a larger portion of the light emitted from the second light-emitting element is filtered by the first color filter unit. That is, by adjusting the light-emitting area blocked by the color filter unit in different light-emitting elements, the spectral energy of the light at different viewing angles is adjusted, thereby improving the color shift problem of the display panel.

[0111] Based on the same inventive concept, embodiments of the present invention also provide a display device. Figure 12 This is a schematic diagram of a display device provided in an embodiment of the present invention. Figure 12 As shown, the display device 20 includes the display panel 10 in the above embodiments, and the display device 10 is a near-eye display device. Exemplary near-eye display devices include AR or VR, etc. The display device provided in the embodiments of the present invention also possesses the beneficial effects described in the above embodiments, which will not be repeated here.

[0112] Optional, Figure 13 This is a schematic diagram of another display device provided in an embodiment of the present invention. Figure 13 As shown, the display panel 10 is a silicon-based organic light-emitting microdisplay panel, and the display device 20 also includes an optical module 30 for near-eye display, with the third angle being the edge light-receiving angle of the optical module.

[0113] Specifically, in near-eye display technology, to obtain a larger field of view (FOV), an optical module 30, such as an optical engine, can be set on the light-emitting surface of the display panel 10. The optical module 30 collects light from different points on the display panel 10 within a range of different cone angles and adjusts the light emission angle before directing the light into the user's pupil, ensuring that the user can receive the light emitted from the display device 20. Furthermore, the third angle is the edge light-receiving angle of the optical module 30, thus ensuring that the optical module 30 can receive the light emitted from the display panel 10. For example, the edge light-receiving angle can be 30°.

[0114] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, It includes multiple light-emitting elements and multiple color filter units; The color filter unit includes a first color filter unit and a second color filter unit. The first color filter unit includes a blue color filter unit, and the filter color of the second color filter unit is different from the filter color of the first color filter unit. The first color filter unit is located on the side of the second color filter unit away from the light-emitting element, and a planarization layer is spaced between the first color filter unit and the second color filter unit. Along the light emission direction, the gap between the first color filter unit and the gap between two adjacent second color filter units overlaps. The light-emitting element includes a first light-emitting element and a second light-emitting element. The first light-emitting element emits blue light, and the light-emitting materials of the first light-emitting element and the second light-emitting element are different. Along the light emission direction, the first color filter unit overlaps with the first light-emitting element, and the second color filter unit overlaps with the second light-emitting element; The first light-emitting element includes a first pixel opening, the first pixel opening includes a first opening portion, and a portion of the light emitted from the first opening portion is incident on the second color filter unit; the second light-emitting element includes a second pixel opening, the second pixel opening includes a second opening portion, and a portion of the light emitted from the second opening portion is incident on the first color filter unit. Along the first direction, the width of the first opening portion is d1, the width of the second opening portion is d2, and d2>d1; wherein, the first direction is parallel to the direction from the first light-emitting element to the second light-emitting element.

2. The display panel according to claim 1, characterized in that, The width of the first pixel opening is D1, the width of the second pixel opening is D2, the exit angle of the light emitted from the first light-emitting element after passing through the first color filter unit is θ1, and the exit angle of the light emitted from the second light-emitting element after passing through the second color filter unit is θ2, wherein: [(D1-d1) / D1]*(cosθ1) 2 -(D2-d2) / D2*(cosθ2) 2 )|≤10%。 3. The display panel according to claim 1, characterized in that, The light emitted from the opening of the first pixel passes through the first color filter unit and is emitted into the external environment at a third angle, and the light emitted from the opening of the second pixel passes through the second color filter unit and is emitted into the external environment at the same third angle.

4. The display panel according to claim 1, characterized in that, The display panel further includes a first planarization layer located on the side of the first color filter unit opposite to the light-emitting element, and an encapsulation layer and a second planarization layer located between the light-emitting element and the second color filter unit; The first color filter unit includes a first surface facing the light-emitting element and a second surface away from the light-emitting element, and the second color filter unit includes a third surface facing the light-emitting element and a fourth surface away from the light-emitting element. The first surface, the second surface, the third surface and the fourth surface are all planar. The refractive index of the first planarization layer is n1, the thickness of the encapsulation layer is d3, the thickness of the second planarization layer is d4, along the light emission direction, the distance between the first surface and the third surface is d5, the distance between the first surface and the fourth surface is d6, the distance in the first direction between the edge of the first pixel opening toward the second color filter unit and the edge of the second color filter unit toward the first pixel opening is d7, the distance in the first direction between the edge of the second pixel opening toward the first color filter unit and the edge of the first color filter unit toward the second pixel opening is d8, and the thickness of the first color filter unit is d9. Where, d1=tan[asin(sinθ4 / n1)]*(d3+d4+d5)-d7-d6*tan[asin(sinθ4 / n1)], θ4 is the emission angle of the light emitted by the first light-emitting element when it exits the light-emitting surface of the display panel. d2=tan[asin(sinθ5 / n1)]*(d3+d4+d5+d9)-d8, where θ5 is the emission angle of the light emitted by the second light-emitting element when it exits the light-emitting surface of the display panel.

5. The display panel according to claim 4, characterized in that, 0.5μm≤d5≤2μm.

6. The display panel according to claim 1, characterized in that, The first color filter unit includes an arc-shaped color filter unit, and the center of the first color filter unit is located on the side of the first color filter unit facing the light-emitting element; The display panel further includes a first planarization layer located on the side of the first color filter unit away from the light-emitting element and a third planarization layer located between the film layer where the first color filter unit is located and the film layer where the second color filter unit is located. The refractive index n1 of the first planarization layer, the refractive index n2 of the first color filter unit, and the refractive index n3 of the third planarization layer satisfy the condition n1>n2≥n3.

7. The display panel according to claim 6, characterized in that, The first color filter unit includes a first surface facing the first planarization layer, and the maximum width of the first surface is W. CF , of which 0 <D1≤W CF / 2.

8. The display panel according to claim 6, characterized in that, The first color filter unit includes a first surface facing the first planarization layer and a second surface facing the third planarization layer, wherein the maximum width of the first surface is W. CF The radius of curvature of the second surface is r, and the thickness of the first color filter unit is d9. Among them, [0.625*(W CF –d9*2)] <r<(W CF –d9*2).

9. The display panel according to claim 6, characterized in that, The first color filter unit includes a first surface facing the first planarization layer, a second surface facing the third planarization layer, and a bottom surface connecting the first surface and the second surface; the distance between the light-emitting surface of the first light-emitting element and the bottom surface is H, where H satisfies 3.5μm≤H≤4μm; The maximum width corresponding to the first surface is W CF Among them, W CF Satisfying 3μm≤W CF ≤4μm; The thickness of the first color filter unit is d9, where d9 satisfies 0.4μm≤d9≤1μm.

10. The display panel according to claim 1, characterized in that, Along the light emission direction of the display panel, the first color filter unit covers the gap between two adjacent second color filter units, and also covers a portion of the second color filter units disposed adjacent to the gap.

11. The display panel according to claim 1, characterized in that, The second color filter unit includes at least a green color filter unit.

12. The display panel according to claim 1, characterized in that, The display panel is a silicon-based organic light-emitting microdisplay panel.

13. A display device, characterized in that, The display panel includes any one of claims 1-12, and the display device is a near-eye display device.

14. A display device, characterized in that, The display device includes the display panel as described in claim 3, wherein the display panel is a silicon-based organic light-emitting microdisplay panel, and the display device further includes an optical module for near-eye display, wherein the third angle is the edge light-receiving angle of the optical module.

Images