Display panel

Abstract

This disclosure provides a display panel including a display functional layer and a short-pass filter. The display functional layer includes a first pixel and a second pixel, wherein the peak wavelength of the preset emitted light of a second sub-pixel in the second pixel is greater than the peak wavelength of the preset emitted light of a first sub-pixel of the same preset emitted light color in the first pixel. The short-pass filter is located on the light-emitting side of the display functional layer, and the orthographic projection of the short-pass filter on the light-emitting surface at least partially overlaps with the orthographic projection of the second pixel on the light-emitting surface. The proportion of light emitted by the second pixel from the short-pass filter at a wide viewing angle is less than the proportion of light emitted by the second pixel from the second pixel at a normal viewing angle, and the intensity of the emitted light from the second pixel at a normal viewing angle is less than the intensity of the emitted light from the second pixel at a wide viewing angle. This can compensate for the brightness of the first pixel at a wide viewing angle, thereby solving the problems of color shift and brightness attenuation in the display panel at wide viewing angles.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more specifically, to a display panel. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are organic thin-film electroluminescent devices. They have attracted great attention and are widely used in electronic display products due to their advantages such as simple manufacturing process, low cost, low power consumption, high brightness, wide viewing angle, high contrast and flexible display capability.

[0003] However, current OLED display products are limited by their own structure, and there are problems such as color decay and color deviation at wide viewing angles, which makes it difficult to meet users' visual needs. Summary of the Invention

[0004] This disclosure provides a display panel to solve the problems of color shift and brightness decay in OLED display panels at wide viewing angles, thereby enabling the OLED display panel to have a good display effect.

[0005] This disclosure provides a display panel including a display functional layer and a plurality of short-wavelength filters. The display functional layer includes a plurality of first pixels and at least one second pixel. A preset emitted light color of a first sub-pixel in each first pixel corresponds one-to-one with a preset emitted light color of a second sub-pixel in each second pixel, and the peak wavelength of the preset emitted light of the second sub-pixel is greater than the peak wavelength of the preset emitted light of the second sub-pixel with the same preset emitted light color. The short-wavelength filters are located on the light-emitting side of the display functional layer, and the orthographic projection of the short-wavelength filters on the light-emitting surface at least partially overlaps with the orthographic projection of the second pixels on the light-emitting surface.

[0006] By placing a combination of a second pixel and a short-pass filter between multiple first pixels, the color shift and brightness attenuation of the first pixel under wide viewing angles can be compensated. This can solve the problem of brightness attenuation and color shift aggravation under wide viewing angles in OLED display panels, thus enabling OLED display panels to have excellent display effects.

[0007] In one implementation of the first aspect of this disclosure, each short-pass filter includes multiple filter units corresponding to the second sub-pixel in the corresponding second pixel. The preset cutoff wavelength of each filter unit is not greater than the peak wavelength of the preset emitted light of the corresponding second sub-pixel in a positive viewing angle, and is not less than the peak wavelength of the preset emitted light of the first sub-pixel with the same preset emitted light color as the corresponding second sub-pixel.

[0008] For example, further, the preset cutoff wavelength of each filter unit is equal to the peak wavelength of the preset outgoing light of the first sub-pixel with the same preset outgoing light color as the corresponding second sub-pixel in a positive viewing angle.

[0009] In one implementation of the first aspect of this disclosure, each second pixel includes a plurality of second sub-pixels with different center wavelengths of preset emitted light. The larger the center wavelength of the preset emitted light of the second sub-pixel, the larger the preset cutoff wavelength of the filter unit corresponding to the second sub-pixel.

[0010] In one implementation of the first aspect of this disclosure, under a positive viewing angle, the difference between the peak wavelength of the preset emitted light of the second sub-pixel and the peak wavelength of the preset emitted light of the first sub-pixel, which has the same preset emitted light color, is not less than a first preset value.

[0011] In one implementation of the first aspect of this disclosure, the first preset value is 5nm.

[0012] In one implementation of the first aspect of this disclosure, the first pixel and the second pixel have the same shape and size in the orthographic projection onto the light-emitting surface.

[0013] In one implementation of the first aspect of this disclosure, the display function layer includes a plurality of periodically arranged pixel groups, each pixel group including a plurality of first pixels and at least one second pixel. The periodic arrangement of the plurality of pixel groups in the display function layer ensures that the second pixels are evenly distributed among the first pixels, avoiding uneven distribution of the second pixels from affecting the display effect.

[0014] For example, further, the number of first pixels in a pixel group is greater than the number of second pixels. This avoids a decrease in the brightness of the display panel at a normal viewing angle.

[0015] In one implementation of the first aspect of this disclosure, the pixel group includes a second pixel and a plurality of first pixels disposed around the second pixel.

[0016] For example, further, the pixel group is specifically a pixel array, with the second pixel positioned in the central region of the pixel array. This ensures that the second pixel provides similar compensation to the first pixel in all its directions, resulting in better consistency in the display panel's presentation.

[0017] In one implementation of the first aspect of this disclosure, the pixel group is specifically a pixel array, and a plurality of second pixels are respectively arranged on a diagonal of the pixel array.

[0018] In one implementation of the first aspect of this disclosure, the display panel further includes an encapsulation layer. The encapsulation layer covers the display functional layer. A short-pass filter is located on the side of the encapsulation layer opposite to the display functional layer.

[0019] In this disclosure, the peak wavelength of the light emitted by the second pixel at a wide viewing angle, after passing through the short-pass filter, is greater than the peak wavelength of the light emitted by the first pixel at a wide viewing angle. This compensates for the chromaticity of the first pixel at wide viewing angles. The short-pass filter blocks less of the light emitted by the second pixel at a wide viewing angle than it blocks at a normal viewing angle, resulting in less intensity of the light emitted at a normal viewing angle than at a wide viewing angle. This compensates for the brightness attenuation of the display panel at wide viewing angles. Therefore, this solves the problems of color shift and brightness attenuation in the display panel at wide viewing angles. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the spectral variation of a sub-pixel of a display panel at a wide viewing angle, provided as an embodiment of this disclosure.

[0021] Figure 2 This is a schematic diagram of a display panel provided in one embodiment of the present disclosure.

[0022] Figure 3 This is an enlarged schematic diagram of a portion of a display panel according to an embodiment of the present disclosure.

[0023] Figure 4 This is a cross-sectional view of a portion of a display panel provided in an embodiment of the present disclosure.

[0024] Figure 5 This is a cross-sectional view of a first pixel in a display panel provided according to an embodiment of the present disclosure.

[0025] Figure 6 This is a cross-sectional view of a second pixel in a display panel provided according to an embodiment of the present disclosure.

[0026] Figure 7 This is a schematic diagram showing the distribution of the first pixel and the second pixel in a display panel provided according to an embodiment of the present disclosure.

[0027] Figure 8 This is a schematic diagram showing the distribution of the first pixel and the second pixel in a display panel provided according to an embodiment of the present disclosure.

[0028] Figure label:

[0029] 10-Display panel; 101-Display function layer; 11-First pixel; 11a, 11b, 11c-First sub-pixel; 12-Second pixel; 12a, 12b, 12c-Second sub-pixel; 13-Short-pass filter; 13a, 13b, 13c-Filter unit; 14-Substrate; 15-Encapsulation layer; 100-Pixel group. Detailed Implementation

[0030] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0031] OLED light-emitting devices are widely used in lighting and display equipment. The working principle of OLED is as follows: under the action of an electric field, holes and electrons are injected from the anode and cathode respectively. After the holes and electrons migrate to the light-emitting layer, they meet to generate energy excitons, which in turn excite the light-emitting molecules in the light-emitting layer to produce visible light.

[0032] Because top-emitting light-emitting devices have optical microcavities, the emitted light wavelength follows the microcavity effect, i.e., mλ = 2ndcosθ (where m is an integer, λ is the wavelength, n is the refractive index of the microcavity, d is the length of the microcavity, and θ is the angle). Figure 1 As shown, the spectrum of emitted light from the blue sub-pixel is illustrated as an example. Solid line A represents the waveform of the emitted light from the blue sub-pixel at a normal viewing angle, and dashed line B represents the waveform at a viewing angle of 15 degrees. At a wide viewing angle, the peak wavelength (the wavelength corresponding to the point of maximum amplitude across the entire spectrum), Pb, is smaller than the peak wavelength Pa of the emitted light at a normal viewing angle. Similar to the blue sub-pixel, the peak wavelength and intensity of the emitted light from the red and green sub-pixels decrease relative to the normal viewing angle at wide viewing angles; that is, the spectral curve of the emitted light at wide viewing angles shifts towards shorter wavelengths relative to the normal viewing angle. However, due to the differences in characteristics between red, green, and blue pixels—that is, when the viewing angle changes by the same amount, the peak wavelength and intensity of the emitted light of different colors change to different degrees—the brightness and color matching at different viewing angles differ from those at a normal viewing angle. This results in a decrease in brightness and an increase in color shift of white light as the viewing angle changes. When the OLED display panel emits white light at a normal viewing angle, color shift and brightness decrease will be observed at wide viewing angles.

[0033] To address the issues of color shift and brightness attenuation in display panels, a comparative study proposed increasing the light output at wide viewing angles by making the anode or light extraction layer of the red, green, and blue sub-pixels spherical, thus avoiding brightness attenuation and color shift at these angles. Specifically, the spherical radii corresponding to the red, green, and blue sub-pixels are set according to the brightness attenuation levels produced by each sub-pixel. This method balances the brightness proportions of the red, green, and blue sub-pixels at off-center viewing angles, improving color shift. However, this comparative method is difficult to manufacture, and the effect of improving color shift is not ideal.

[0034] In view of this, the present disclosure provides a display panel to solve the problems of brightness decay and color shift of OLED display panels at wide viewing angles, thereby enabling OLED display panels to have excellent display effects.

[0035] The specific structure of the display panel in at least one embodiment of this disclosure will now be described with reference to the accompanying drawings. In these drawings, a spatial rectangular coordinate system is established with the surface where the display functional layer is located (the surface where the display panel is located) as a reference to illustrate the position of each structure in the display panel. In this spatial rectangular coordinate system, the X-axis and Y-axis are parallel to the surface where the light-emitting functional layer is located, and the Z-axis is perpendicular to the surface where the light-emitting functional layer is located.

[0036] Figure 2 This is a schematic diagram of a display panel provided in one embodiment of the present disclosure. Figure 3 This is an enlarged schematic diagram of a portion of a display panel according to an embodiment of the present disclosure. Figure 4 For along Figure 3 A cross-sectional view of line CD. (See diagram below.) Figures 2-4 As shown, the display panel 10 includes a display area AA. An enlarged view of the display function layer of region S1 within the display area AA of the display panel 10 is shown below. Figure 3 As shown, the display area AA includes multiple first pixels 11 and multiple second pixels 12 arranged in an array. The first pixels and the second pixels can emit light in response to electrical signals.

[0037] like Figures 2-4 As shown, a display panel 10 provided in one embodiment of this disclosure includes a display functional layer 101 and a plurality of short-pass filters 13. The display functional layer 101 includes a plurality of first pixels 11 and at least one second pixel 12. Each first pixel 11 includes a plurality of first sub-pixels with different preset emitted light colors, and each second pixel 12 includes a plurality of second sub-pixels with different preset emitted light colors. The preset emitted light color of the first sub-pixel in each first pixel corresponds one-to-one with the preset emitted light color of the second sub-pixel in each second pixel, and the peak wavelength of the preset emitted light of the second sub-pixel is greater than the peak wavelength of the preset emitted light of the first sub-pixel with the same preset emitted light color. The plurality of short-pass filters 13 are located on the light-emitting side of the display functional layer 101, and the orthographic projection of the short-pass filters 13 on the light-emitting surface (not shown) at least partially overlaps with the orthographic projection of the second pixel 12 on the light-emitting surface. The light-emitting surface is a virtual plane parallel to the display functional layer 101.

[0038] The peak wavelength of the light emitted from the second pixel at a wide viewing angle, after passing through the short-pass filter, is greater than that of the light emitted from the first pixel at a wide viewing angle. Furthermore, the light intensity emitted by the second pixel at a wide viewing angle is greater than that at a normal viewing angle. Therefore, by placing a combination of second pixels and short-pass filters among multiple first pixels, the color shift and brightness attenuation of the first pixels at wide viewing angles can be compensated. This solves the problems of brightness attenuation and color shift in OLED display panels at wide viewing angles, thus enabling the OLED display panel to achieve excellent display performance.

[0039] The specific structures of the first pixel and the second pixel in at least one embodiment of this disclosure will now be described with reference to the accompanying drawings.

[0040] like Figure 5 and Figure 6 As shown, each first pixel 11 includes multiple first sub-pixels with different preset emitted light colors, and each second pixel 12 includes multiple second sub-pixels with different preset emitted light colors, and the peak wavelength of the preset emitted light of at least one second sub-pixel is greater than the peak wavelength of the preset emitted light of the first sub-pixel with the same preset emitted light color.

[0041] Specifically, the display functional layer 101 further includes a substrate 14, on which a plurality of first pixels 11 and a plurality of second pixels 12 are disposed according to a predetermined arrangement. Exemplarily, the substrate 14 is an array substrate including pixel driving circuitry. The display functional layer also includes a pixel defining layer formed on the substrate, which defines the positions of the first pixels and the second pixels.

[0042] Multiple short-pass filters 13 are located on the light-emitting side of the display functional layer 101, and the orthographic projection of the short-pass filters 13 on the light-emitting surface at least partially overlaps with the orthographic projection of the second pixel 12 on the light-emitting surface.

[0043] Specifically, the orthographic projection of the short-pass filter 13 on the light-emitting surface overlaps with the orthographic projections of multiple sub-pixels in the second pixel 12 on the light-emitting surface. The short-pass filter 13 is used to block light with a wavelength greater than a predetermined wavelength from the emitted light of each second sub-pixel. The predetermined wavelength is at least within the wavelength range of the emitted light from the second sub-pixel at a normal viewing angle.

[0044] refer to Figure 1Due to the microcavity effect, the spectrum of the emitted light from the second sub-pixel at a wide viewing angle is blue-shifted compared to the spectrum at a normal viewing angle. With the cutoff wavelength of the short-pass filter remaining constant, the maximum wavelength of the emitted light from the second sub-pixel at both the normal and wide viewing angles is equal to the cutoff wavelength of the short-pass filter. The proportion of light from the second sub-pixel that is blocked by the short-pass filter 13 at the normal viewing angle is greater than the proportion blocked by the short-pass filter 13 at a wide viewing angle. Therefore, by setting the peak wavelength of the emitted light from the second sub-pixel at the normal viewing angle to be greater than the peak wavelength of the emitted light from the first sub-pixel of the same emission color at the normal viewing angle, and by placing a short-pass filter 13 on the light-emitting side of the second sub-pixel, light with wavelengths greater than the predetermined wavelength is blocked from the emitted light from the second sub-pixel. This design ensures that the light intensity of the emitted light from the second sub-pixel at a wide viewing angle is greater than that at the normal viewing angle after passing through the short-pass filter 13, thus compensating for the brightness attenuation of the first pixel 11 at wide viewing angles.

[0045] The wavelength range of the emitted light from each second sub-pixel is affected by the material of the light-emitting layer of the light-emitting device in that sub-pixel. The peak wavelength of the second sub-pixel is greater than that of the first sub-pixel of the same color, mainly achieved by setting the materials of the light-emitting layers of the light-emitting devices of the second and first sub-pixels to be different. Specifically, the material of the light-emitting layer of the second sub-pixel can be a multi-layer composite structure, for example, it can be formed by stacking a light-emitting layer of other materials on the same light-emitting layer as the first sub-pixel. This application does not limit the material and preparation method of the light-emitting layer of the light-emitting device of each sub-pixel. The material and preparation method of the light-emitting layer of the light-emitting device of each sub-pixel can be adaptively adjusted according to the design needs of the display panel 10.

[0046] In one embodiment of the present disclosure, the display panel 10 further includes an encapsulation layer 15, a reference 5, and Figure 6 The encapsulation layer 15 is used to protect the first pixel 11 and the second pixel 12. Specifically, the encapsulation layer 15 is located on the light-emitting side of the first pixel 11 and the second pixel 12. The orthographic projection of the encapsulation layer 15 onto the display functional layer 101 overlaps with all the first pixels 11 and all the second pixels 12. That is, the encapsulation layer 15 covers the first pixel 11 and the short-pass filter 13. The encapsulation layer 15, whose projection onto the display functional layer 101 overlaps with the second pixel 12, is located between the display functional layer 101 and the multiple short-pass filters 13. By setting the encapsulation layer 15, the surface of the display panel 10 can be planarized, and the main surface of the encapsulation layer 15 and the main surface of the second pixel 12 are parallel, which can make the main surfaces of the short-pass filters 13 and the second pixel 12 parallel, avoiding affecting the emission direction of the emitted light from the second pixel 12.

[0047] In one embodiment of the present disclosure, each filter includes a plurality of filter units corresponding to a plurality of second sub-pixels in the corresponding second pixel 12. The preset cutoff wavelength of each filter unit is not greater than the preset peak wavelength of the emitted light of the second sub-pixel in the corresponding second pixel 12 under a positive viewing angle, and is not less than the preset peak wavelength of the emitted light of the first sub-pixel in the first pixel 11 that has the same color as the second sub-pixel in the corresponding second pixel 12.

[0048] The preset cutoff wavelength of the filter unit is not less than the preset peak wavelength of the emitted light of the first sub-pixel. This ensures that the peak wavelength of the emitted light of the second sub-pixel at a wide viewing angle is greater than the peak wavelength of the emitted light of the first sub-pixel with the same emitted color at a wide viewing angle. This compensates for the reduction in the peak wavelength of the first sub-pixel at a wide viewing angle due to the microcavity effect, and also compensates for the color shift of the first sub-pixel at a wide viewing angle. The preset cutoff wavelength of the filter unit is not greater than the preset peak wavelength of the emitted light of the second sub-pixel. This prevents the difference between the emitted light of the second sub-pixel and the emitted light of the first sub-pixel from being too large, which would affect the display effect of the display panel 10 at a normal viewing angle.

[0049] For example, the preset cutoff wavelength of each filter unit is approximately equal to the peak wavelength of the preset emitted light of the first sub-pixel of the first pixel 11, which has the same preset emitted light color as the second sub-pixel in the corresponding second pixel 12 at a forward viewing angle. This ensures that the chromaticity of the light emitted from the second pixel 12 after passing through the short-pass filter 13 is essentially the same as the chromaticity of the emitted light from the first pixel 11. Simultaneously, the cutoff wavelength of the short-pass filter 13 is smaller than the peak wavelength of the second sub-pixel at a forward viewing angle, causing the intensity of the blocked light from the second sub-pixel at a forward viewing angle to be near the peak wavelength, resulting in very low brightness of the second sub-pixel at a forward viewing angle. However, due to the microcavity effect, the emitted light from the second sub-pixel at a wide viewing angle undergoes a blue shift, resulting in a peak wavelength smaller than the cutoff wavelength at a wide viewing angle. Therefore, the emitted light from the second pixel at a wide viewing angle is brighter, increasing the difference in light output between the second sub-pixel at a forward viewing angle and at a wide viewing angle, thereby enhancing the brightness compensation effect at wide viewing angles.

[0050] In one embodiment of the present disclosure, each second pixel 12 includes a plurality of second sub-pixels with different center wavelengths of preset emitted light. The larger the center wavelength of the preset emitted light of the second sub-pixel, the larger the preset cutoff wavelength of the filter unit corresponding to the second sub-pixel. The center wavelength is the weighted average vacuum wavelength of the light source, and the center wavelength of the monochromatic light source is substantially equal to the peak wavelength.

[0051] Specifically, the number of filter units is the same as the number of second sub-pixels in the second pixel 12. The orthographic projection of the filter unit on the light-emitting surface completely overlaps with the orthographic projection of the corresponding second sub-pixel in the second pixel 12 on the light-emitting surface. The preset cutoff wavelength of each filter unit varies depending on the center wavelength of the preset emitted light of the sub-pixel in the second pixel 12 corresponding to the filter unit. In other words, the orthographic projection of the filter unit on the light-emitting surface completely covers the orthographic projection of a second sub-pixel on the light-emitting surface, and the cutoff wavelength of the filter unit increases as the center wavelength of the preset emitted light of the second sub-pixel increases.

[0052] In one embodiment of the present disclosure, the difference between the peak wavelength of the preset emitted light of the sub-pixel in the second pixel 12 and the peak wavelength of the preset emitted light of the sub-pixel with the same preset emitted light color in the first pixel 11 is not less than a first preset value. The smaller the difference between the peak wavelength of the emitted light of the first sub-pixel in the positive viewing angle and the peak wavelength of the emitted light of the second sub-pixel with the same emitted light color in the positive viewing angle, the smaller the difference between the peak wavelength of the emitted light of the second sub-pixel in the large viewing angle and the peak wavelength of the emitted light of the first sub-pixel in the large viewing angle, and the less obvious the compensation effect. Therefore, ensuring that the difference between the peak wavelength of the emitted light of the first sub-pixel in the positive viewing angle and the peak wavelength of the emitted light of the second sub-pixel with the same emitted light color in the positive viewing angle is not less than the first preset value can improve the compensation effect and reduce the color shift of the display panel 10 in the large viewing angle.

[0053] In one embodiment of the present disclosure, the first preset value is 5nm. A first preset value less than 5nm will result in insufficient compensation effect. Furthermore, the difference between the peak wavelength of the emitted light from the first sub-pixel at a positive viewing angle and the peak wavelength of the emitted light from the second sub-pixel with the same emitted color at a positive viewing angle should not be too large. An excessive difference between the two will result in excessive color deviation between the first and second sub-pixels, affecting the display effect of the display panel 10. For example, the difference between the peak wavelength of the emitted light from the first sub-pixel at a positive viewing angle and the peak wavelength of the emitted light from the second sub-pixel with the same emitted color at a positive viewing angle can be between 5nm and 10nm. The difference in peak wavelength between the emitted light from the second sub-pixel and the first sub-pixel of each color can be the same or different, and can be adaptively adjusted according to the actual degree of color shift. For example, the difference between the peak wavelengths of the emitted light from the three second sub-pixels with emission colors of red, green and blue and the three first sub-pixels with emission colors of red, green and blue under a positive viewing angle can all be 5nm, and the difference between the peak wavelengths of the emitted light from the three second sub-pixels with emission colors of red, green and blue and the three first sub-pixels with emission colors of red, green and blue under a positive viewing angle can be 5nm, 8nm and 5nm respectively.

[0054] Optionally, the peak wavelength intensity of the emitted light from the second sub-pixel at a positive viewing angle is also greater than the peak wavelength intensity of the emitted light from the first sub-pixel of the same emission color at a positive viewing angle. In this way, the brightness of the emitted light from the first sub-pixel is greater at a wider viewing angle, thereby better compensating for the brightness attenuation of the first sub-pixel at wider viewing angles.

[0055] For example, the first pixel 11 includes three first sub-pixels with emission colors of red, green, and blue, respectively, and the second pixel 12 includes three second sub-pixels with emission colors of red, green, and blue, respectively. The peak wavelength of the emitted light from the second sub-pixel with emission color of red is 10 nm larger than the peak wavelength of the first sub-pixel with emission color of red, the peak wavelength of the emitted light from the second sub-pixel with emission color of green is 7 nm larger than the peak wavelength of the first sub-pixel with emission color of green, and the peak wavelength of the emitted light from the second sub-pixel with emission color of blue is 5 nm larger than the peak wavelength of the first sub-pixel with emission color of blue. The short-pass filter 13 includes a filter unit 13a corresponding to the second sub-pixel 12a with emission color of red, a filter unit 13b corresponding to the second sub-pixel 12b with emission color of green, and a filter unit 13c corresponding to the second sub-pixel 12c with emission color of blue. The projections of the three filter units onto the surface of the display functional layer 101 overlap with the second sub-pixels with emission colors of red, green, and blue, respectively. The cutoff wavelength of the filter unit 13a, whose projection onto the surface of display functional layer 101 overlaps with the red second sub-pixel 12a, is substantially equal to the peak wavelength of the emitted light from the red first sub-pixel 11a. The cutoff wavelength of the filter unit 13b, whose projection onto the surface of display functional layer 101 overlaps with the green second sub-pixel 12b, is substantially equal to the peak wavelength of the emitted light from the green first sub-pixel 11b. The cutoff wavelength of the filter unit 13c, whose projection onto the surface of display functional layer 101 overlaps with the blue second sub-pixel 12c, is substantially equal to the peak wavelength of the emitted light from the blue first sub-pixel 11c.

[0056] It should be noted that this is not intended to limit the emission color of sub-pixels or the number of sub-pixels. In other embodiments, the emission colors of the sub-pixels in the first pixel 11 and the second pixel 12 are not limited to red, green, and blue, and the number of sub-pixels in the first pixel 11 and the second pixel 12 is not limited to three. The number of sub-pixels and the emission colors can be adaptively adjusted according to the design needs of the display panel 10. For example, each first pixel 11 and each second pixel 12 may each include four sub-pixels with preset emission colors of red, green, blue, and yellow. Or, each first pixel 11 and each second pixel 12 may each include five sub-pixels with preset emission colors of red, red, green, blue, and white. This embodiment is not intended to limit the area ratio of sub-pixels of different emission colors; the ratio of sub-pixels of each emission color can be adaptively adjusted as needed.

[0057] It should be noted that in the above embodiments, the first sub-pixel and the second sub-pixel with the same emitted light color are not necessarily identical in chromaticity. Specifically, the wavelength range of the preset emitted light of the first sub-pixel and the wavelength range of the preset emitted light of the second sub-pixel are located within the wavelength range of light of the same color. For example, the wavelength of red light is between 615nm and 650nm. The wavelength range of the preset emitted light of the first sub-pixel and the second sub-pixel emitting red light are both between 615nm and 650nm. The peak wavelength and half-peak width of the preset emitted light of the first sub-pixel and the preset emitted light of the second sub-pixel of the same color can be different.

[0058] In this disclosure, in order to solve the color shift problem of the display panel 10 at a wide viewing angle, some of the first pixels 11 are replaced with a structure combining the second pixel 12 and the short-pass filter 13. The peak wavelength of the emitted light from the structure combining the second pixel 12 and the short-pass filter 13 at a wide viewing angle is greater than the peak wavelength of the emitted light from the first pixel 11 at a wide viewing angle, which can compensate for the color shift of the first pixel 11 at a wide viewing angle.

[0059] The specific layout of the first pixel and the second pixel in at least one embodiment of this disclosure will now be described with reference to the accompanying drawings.

[0060] like Figure 7 and Figure 8As shown, in one embodiment of the present disclosure, the first pixel 11 and the second pixel 12 have the same shape and size when projected onto the same horizontal plane. Specifically, the shape, size, and number of the second sub-pixels in each second pixel 12 are the same as the shape, size, and number of the first sub-pixels of the same color in a first pixel 11. This ensures that the area ratio of each color sub-pixel in the first pixel 11 and the second pixel 12 is the same, avoiding display deviations caused by different area ratios of the sub-pixels of different colors in both, and ensuring that the display effect of the display panel 10 is not affected at a normal viewing angle. Simultaneously, the identical structure of the first pixel 11 and the second pixel 12 facilitates the configuration of the driving circuit; that is, in a display panel 10 entirely composed of first pixels 11, only some of the positions of the first pixels 11 are set as second pixels 12, without changing the original circuit layout.

[0061] In one embodiment of the present disclosure, the display functional layer 101 includes a plurality of periodically arranged pixel groups 100, each pixel group 100 including a plurality of first pixels 11 and at least one second pixel 12. Since the emitted light portion of the second pixel 12 is blocked by a short-wavelength filter, the intensity of the emitted light from the second pixel 12 after passing through the short-wavelength filter is less than the intensity of the emitted light from the first pixel 11. The periodic arrangement of the plurality of pixel groups 100 in the display functional layer 101 allows the second pixels 12 to be evenly distributed among the first pixels 11, thereby avoiding uneven distribution of the second pixels 12 from affecting the display effect.

[0062] For example, the number of first pixels 11 in a pixel group is greater than the number of second pixels 12. That is, the total area of ​​the first pixels 11 is greater than the total area of ​​the second pixels 12. Since the intensity of the light emitted by the second pixel 12 after passing through the short-wavelength filter is less than the intensity of the light emitted by the first pixel 11, an excessive number of second pixels 12 will lead to a decrease in the brightness of the display panel 10 at a normal viewing angle. The fact that the total area of ​​the first pixels 11 is greater than the total area of ​​the second pixels 12 can prevent the decrease in the brightness of the display panel 10 at a normal viewing angle.

[0063] In one embodiment of the present disclosure, the pixel group 100 includes a second pixel 12 and a plurality of first pixels 11 disposed around the second pixel 12.

[0064] For example, the second pixel 12 is located in the central region of the pixel array. Further, the pixel group 100 is specifically a pixel array of rows a and columns b, with the second pixel 12 located at the center of the pixel array, where a and b are both odd numbers greater than or equal to 3, and one second pixel 12 is located at the center of the pixel array. Figure 4As shown, pixel group 100 is specifically a 3x3 pixel array, with one second pixel 12 positioned at the center of the pixel array. This placement of the second pixel at the exact center of the pixel array, with a distance approximately equidistant from the first pixels surrounding it, results in a similar compensation effect for the surrounding second pixels, thus improving the consistency of the display panel's display.

[0065] In one embodiment of the present disclosure, the pixel group 100 is specifically an m-row n-column pixel array, with m second pixels 12 respectively disposed on a diagonal of the pixel array, and a plurality of first pixels 11 disposed at positions in the pixel array where no second pixels 12 are disposed. For example, as... Figure 5 As shown, m equals n equals 3, and pixel group 100 is specifically a 3x3 pixel array. Thus, from the perspective of the entire display panel, multiple second pixels are set along a diagonal. The compensation effect of the second pixels on this diagonal on the first pixels on both sides of the diagonal is basically the same, which can improve the consistency of the display panel.

[0066] It should be noted that the pixel group 100 can also be a polygon (e.g., a hexagon) formed by arranging multiple first pixels 11 and second pixels 12 in a predetermined manner. This embodiment does not limit the arrangement of the pixel group 100.

[0067] This disclosure provides a display device, which can be the display screen of electronic products such as smartphones, computer monitors, game consoles, and televisions.

[0068] The display device provided according to the embodiments of this disclosure and the display panel provided according to the embodiments of this disclosure belong to the same inventive concept, and have corresponding film layer structures and beneficial effects. Details not described in detail in the embodiments of the display device can be found in the embodiments of the display panel, and will not be repeated here.

[0069] It should be noted that, for clarity, the entire structure of the display panel described above is not presented. For example, the display functional layer in this disclosure may include a pixel defining layer, which includes multiple grooves, and multiple light-emitting devices are located in the grooves of the pixel defining layer to form sub-pixels of the display panel. Further, the light-emitting devices may include an anode, a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and a cathode, which are stacked sequentially. As another example, a color filter (CF) is also provided on the light-emitting side of the display functional layer. The color filter includes a color filter to prevent external light from interfering with the emitted light of the first and second pixels. To achieve the necessary functions of the display panel, those skilled in the art can configure other structures according to specific application scenarios, and the embodiments of this disclosure do not limit this.

[0070] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications or equivalent substitutions made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A display panel, characterized by, include: The display functional layer includes multiple first pixels and at least one second pixel. The preset emitted light color of the first sub-pixel in each first pixel corresponds one-to-one with the preset emitted light color of the second sub-pixel in each second pixel, and the peak wavelength of the preset emitted light of the second sub-pixel is greater than the peak wavelength of the preset emitted light of the first sub-pixel with the same preset emitted light color. A short-pass filter is located on the light-emitting side of the display functional layer, and the orthographic projection of the short-pass filter on the light-emitting surface at least partially overlaps with the orthographic projection of the second pixel on the light-emitting surface, so as to block light with a wavelength greater than a predetermined wavelength from the emitted light of the second sub-pixel. The predetermined wavelength is at least within the wavelength range of the emitted light of the second sub-pixel at a normal viewing angle.

2. The display panel according to claim 1, characterized in that, Each of the short-pass filters includes a filter unit corresponding to the second sub-pixel in the corresponding second pixel. The preset cutoff wavelength of each filter unit is not greater than the peak wavelength of the preset emitted light of the corresponding second sub-pixel in a positive viewing angle, and is not less than the peak wavelength of the preset emitted light of the first sub-pixel with the same preset emitted light color as the corresponding second sub-pixel.

3. The display panel according to claim 2, characterized in that, The preset cutoff wavelength of each filter unit is equal to the peak wavelength of the preset outgoing light of the first sub-pixel that has the same preset outgoing light color as the second sub-pixel in a positive viewing angle.

4. The display panel according to claim 2, characterized in that, Each second pixel includes multiple second sub-pixels with different center wavelengths of the preset emitted light, and The larger the center wavelength of the preset emitted light of the second sub-pixel, the larger the preset cutoff wavelength of the filter unit corresponding to the second sub-pixel.

5. The display panel according to claim 1, characterized in that, From a normal viewing angle, the difference between the peak wavelength of the preset emitted light of the second sub-pixel and the peak wavelength of the preset emitted light of the first sub-pixel, which has the same preset emitted light color, is not less than a first preset value.

6. The display panel according to claim 5, characterized in that, The first preset value is 5nm.

7. The display panel according to claim 1, characterized in that, The first pixel and the second pixel have the same shape and size in their orthographic projections onto the light-emitting surface.

8. The display panel according to any one of claims 1-7, characterized in that, The display function layer includes a plurality of periodically arranged pixel groups, each pixel group including a plurality of first pixels and at least one second pixel.

9. The display panel according to claim 8, characterized in that, The number of the first pixels in a pixel group is greater than the number of the second pixels.

10. The display panel according to claim 9, characterized in that, The pixel group includes the second pixel and a plurality of first pixels disposed around the second pixel.

11. The display panel according to claim 10, characterized in that, The pixel group is specifically a pixel array, and the second pixel is located in the central region of the pixel array.

12. The display panel according to claim 10, characterized in that, The pixel group is specifically a pixel array, and multiple second pixels are respectively arranged on one diagonal of the pixel array.

13. The display panel according to claim 1, characterized in that, Also includes: An encapsulation layer that covers the display function layer; The short-pass filter is located on the side of the encapsulation layer opposite to the display functional layer.

Images