Patent ID: 12207485

DESCRIPTION OF EMBODIMENTS

For better illustrating technical solutions of the present disclosure, embodiments of the present disclosure will be described in detail as follows with reference to the accompanying drawings.

It should be noted that, the described embodiments are merely exemplary embodiments of the present disclosure, which shall not be interpreted as providing limitations to the present disclosure. All other embodiments obtained by those skilled in the art according to the embodiments of the present disclosure without creative efforts are within the protection scope of the present disclosure.

The terms used in the embodiments of the present disclosure are merely for the purpose of describing particular embodiments but not intended to limit the present disclosure. Unless otherwise noted in the context, the singular form expressions “a”, “an”, “the” and “said” used in the embodiments and appended claims of the present disclosure are also intended to represent plural form expressions thereof.

It should be understood that the term “and/or” used herein is merely an association relationship describing associated objects, indicating that there may be three relationships, for example, A and/or B may indicate three cases, i.e., A exists alone, both A and B exist, B exists alone. In addition, the character “/” herein generally indicates that the related objects in front of and behind the character form an “or” relationship.

It should be understood that although the barrier may be described using the terms “first”, “second”, etc., in the embodiments of the present disclosure, the barrier will not be limited to these terms. These terms are merely used to distinguish barriers from one another. For example, without departing from the scope of the embodiments of the present disclosure, a first barrier may also be referred to as a second barrier, similarly, a second barrier may also be referred to as a first barrier.

An embodiment of the present disclosure provides a display panel100, as shown inFIG.1, which is an enlarged schematic top view of the display panel100. The display panel100includes a plurality of sub-pixels having different colors. Each sub-pixel includes a light-emitting unit10and a color changing layer20that are opposed to each other. Color changing layers20of the sub-pixels having different colors from each other have different emission colors from each other.

FIG.2is a schematic cross-sectional view taken along AA′ line inFIG.1. As shown inFIG.2, the display panel includes a first substrate1and a second substrate2that are opposed to each other, the first substrate1includes a plurality of light-emitting units10, and a preset space is provided between any two adjacent light-emitting units10. The second substrate2includes a plurality of color changing layers20, and a corresponding space is provided between any two adjacent color changing layers20. The plurality of color changing layers20corresponds to the plurality of light-emitting units10in one-to-one correspondence to form a plurality of sub-pixels in such a manner that each color changing layer20and a corresponding light-emitting unit10form a respective one sub-pixel. The incident light can be converted into light having a specific color after passing through the color changing layer20, so that the sub-pixel emits light having a corresponding color.

In this embodiment of the present disclosure, the color changing layers20of the sub-pixels having different colors correspond to different emission colors. For example, for a display panel using RGB three-color display technology, a color changing layer having a red emission color corresponds to a red sub-pixel, a color changing layer having a red emission color corresponds to a green sub-pixel, and a color changing layer having a blue emission color corresponds to a blue sub-pixel.

In an example, the color changing layer20may include a color resist and/or quantum dots. Here, the color resist can allow transmission of only light having a certain color by filtering out light having other colors. The quantum dots may be formed by photochromic materials, that is, the quantum dots can emit light having a certain color under excitation of light emitted by the light-emitting unit10. For example, a red color resist and/or red quantum dots can used at a position of the red sub-pixel, and the red color resist allows transmission of red light. The red quantum dots are quantum dots that emit red light under excitation of light emitted by the light-emitting unit. Quantum dots have advantages of concentrated and continuously adjustable emission spectra, and high color purity. In the embodiment of the present disclosure, applying quantum dots to the display panel can effectively increase a color gamut and color reproduction capability of the display panel.

In an embodiment of the present disclosure, only quantum dots or only a color resist that emits a color is provided in a color changing layer20having the corresponding color, or both quantum dots and a color resist that emit a color are provided in a color changing layer20having a corresponding color. In a case where the both quantum dots and the color resist are provided in the color changing layer20, the quantum dots and the color resist may be stacked. For example, as shown inFIG.3, which is another schematic cross-sectional view taken along AA′ line shown inFIG.1, the quantum dots202are located at a side of the color resist201close to the first substrate1. In this case, light emitted from the light-emitting unit10first enters the quantum dots202, a part of the light is excitation light under which the quantum dots202is excited, light excited by the quantum dots202is then transmitted through the color resist201, and the part of the light that is emitted from the light-emitting unit10and has not been used as the excitation light of the quantum dots202is filtered out by the color resist, so as to achieve a required chromaticity of light emitted from the sub-pixel.

The light-emitting units10of sub-pixels having different colors can emit light rays having the same color. For example, a light-emitting unit10that emits white light can be respectively provided in the first substrate1at a position corresponding to the red sub-pixel, a position corresponding to the green sub-pixel and a position corresponding to the blue sub-pixel. The respective white light emitted by these light-emitting units is converted into red light, green light and blue light after passing through the color changing layers20having different colors.

Alternatively, in a case where photochromic quantum dot materials are included in the color changing layers20, the color changing layers20including quantum dots may have a red emission color and a green emission color, and the light-emitting units10of the sub-pixels having different colors may emit blue light that has a higher frequency than red light and green light. Under excitation of the blue light, the color changing layers20including different quantum dot materials emit red light and green light, respectively. In this case, the color changing layer20in the second substrate2at the position corresponding to the blue sub-pixel may be made of a transparent material.

Alternatively, in an embodiment of the present disclosure, the light-emitting units10of the sub-pixels of different colors may emit light of different colors, respectively. For example, in the first substrate1, a light-emitting unit that emits red light is provided at a position corresponding to a red sub-pixel, a light-emitting unit that emits green light is provided at a position corresponding to a green sub-pixel, and a light-emitting unit that emits blue light is provided at a position corresponding to the blue sub-pixel.

It should be noted that the light-emitting unit10described above may be an organic light-emitting device (OLED). Alternatively, the light-emitting unit10may be a blue micro light-emitting diode (Micro-LED). Here, the Micro-LED has a size smaller than or equal to 100 μm. Using the Micro-LED as the light-emitting unit10can effectively increase a service life of the display panel, decrease power consumption of the display panel, decrease response time of the display panel, and increase a viewing angle of the display panel.

While the display panel is working, the light-emitting unit10emits light, and the light emitted by the light-emitting unit10is directed to the corresponding color changing layer20(as illustrated by light B inFIG.2) which then outputs light of the corresponding color, so that the corresponding sub-pixel emits a light ray of a preset color. Light rays having different colors are mixed according to different light intensity ratios to form various colors, so that the display panel can achieve full-color display. Here, a side where the second substrate2is located is a light-exit side of the display panel.

As shown inFIG.2, the display panel further includes a first barrier31and a second barrier32located between the first substrate1and the second substrate2. The first barrier31overlaps the second barrier32in a thickness direction of the display panel. In addition, an orthographic projection of the first barrier31and an orthographic projection of the second barrier32onto the display panel are located at the space between two adjacent light-emitting units10.

In an embodiment of the present disclosure, an optical density (OD) of the first barrier31is different from an optical density of the second barrier32, and a reflectivity of the first barrier31is different from a reflectivity of the second barrier32. Here, the optical density OD=−log(I/IO), where IOrepresents an original intensity of a light source, and I represents a light intensity after the light source passes through the optical structure. A larger optical density indicates that the optical structure absorbs more light. A smaller optical density indicates that the optical structure absorbs less light.

In the embodiment of the present disclosure, with the first barrier31and the second barrier32arranged between the first substrate1and the second substrate2of the display panel, and the first barrier31and the second barrier32having different optical densities, the first barrier31and the second barrier32have different degrees of absorption to light passing different positions or light propagating along different directions in the display panel. In other words, in the embodiments of the present disclosure, the first barrier31and the second barrier32can differentiate the light propagating in the display panel. For example, as for light that may cause emission light crosstalk between different sub-pixels, a first barrier having a first optical density can be provided in a propagation path of the light; and as for other light that is relatively unlikely to cause the crosstalk, a second barrier having a second optical density different from the first optical density can be provided in a propagation path of the other light. With such configuration, the first barrier31and the second barrier32have different degrees of absorption to light passing the first barrier31and the second barrier32, thereby not only decreasing a risk of light crosstalk between the sub-pixels having different colors in the display panel, but also avoiding excessive absorption to light in the display panel to cause unnecessary light loss.

In addition, in this embodiment of the present disclosure, with the reflectivity of the first barrier31different form the reflectivity of the second barrier32, on the basis of decreasing the risk of light crosstalk between sub-pixels having different colors in the display panel, light rays propagating in the display panel can also be reflected to different degrees. For example, as for a first light ray that can cause emission light crosstalk between different sub-pixels, the first barrier31located in a propagation path of the first light ray may have a first reflectivity; and as for a second light ray that is relatively unlikely to cause color crosstalk, the second barrier32located in a propagation path of the second light ray may have a second reflectivity different from the first reflectivity. By reflecting the light rays described above to different degrees, part of the light that will have deviated from the preset propagation path is directed to the corresponding color changing layer20after being reflected and is then radiated out from the light-exit side of the display panel. On the basis of decreasing the risk of light crosstalk between the sub-pixels of different colors in the display panel, the light emitted by the light-emitting unit in the display panel can be fully and effectively utilized, thereby increasing luminous brightness of the display panel.

In an embodiment of the present disclosure, one of the first barrier31and the second barrier32has a relatively large optical density, and the other one of the first barrier31and the second barrier32has a relatively small optical density. In this case, during radiation of the light emitted from the light-emitting unit10of one sub-pixel to the corresponding color changing layer20, the light emitted by the light-emitting unit10can propagate in a plurality of directions, and if a part of light that propagates in a direction deviating from the normal of the display panel is radiated toward a color changing layer having a different emission color near the one sub-pixel (as illustrated by light C inFIG.2), the first barrier31or the second barrier32having the relatively large optical density can absorb this part of light, thereby avoiding light crosstalk between the sub-pixels having different colors.

In addition, after light emitted by a light-emitting unit10of a sub-pixel of one color is radiated out from the corresponding color changing layer20, if a part of the light deviates from a normal light-emitting direction during propagating to the light-exit side of the display panel and is directed to an area of another sub-pixel of another color (as illustrated by light D inFIG.2), the first barrier31or the second barrier32having the relatively large optical density can also absorb this part of light, thereby preventing this part of light from exiting from the area of another sub-pixel of another color. In this way, a possibility of light crosstalk between sub-pixels having different colors can be further reduced.

Further, in the embodiment of the present disclosure, with the reflectivity of the first barrier31being different from the reflectivity of the second barrier32, that is, one of the first barrier31and the second barrier32has a relatively large reflectivity, and the other one of the first barrier31and the second barrier32has a relatively small reflectivity, the light that is emitted by the light-emitting unit10and is then reflected by the first barrier31or the second barrier32having the relatively large reflectivity can be used again. For example, the part of light emitted by the light-emitting unit10that is not radiated to the color changing layer20having the corresponding color but is directly radiated to the first barrier31or the second barrier32(as illustrated by light E inFIG.2) can be reflected by the first barrier31or the second barrier32having the relatively large reflectivity to the corresponding color changing layer20and is then radiated out from the color changing layer20. With such configuration, emission loss of the light-emitting unit10can be decreased, thereby effectively increasing utilization of light emitted from the light-emitting unit10, and thus increasing an emission intensity of the display panel and increasing the brightness of the display panel.

To sum up, according to the embodiments of the present disclosure, the first barrier31or the second barrier32having the relative large optical density can be used to absorb the part of light that is emitted from one sub-pixel area but propagates obliquely to a color changing layer20of another sub-pixel, thereby decreasing light crosstalk between the sub-pixels having different colors, and thus achieving a required chromaticity of the display panel; and the first barrier31or the second barrier32having the relatively large reflectivity can be used to reflect the part of light that is emitted by the light-emitting unit10and is then not radiated to the corresponding color changing layer20but is directly radiated to the barrier, and the reflected light can be radiated to the corresponding color changing layer20and is then radiated out from the light-exit side of the display panel, thereby increasing light extraction efficiency of the light-emitting unit10, and increasing the emission brightness of the display panel. In other words, with the configuration according to the embodiments of the present disclosure, both chromaticity and brightness of the display panel can be increased, thereby effectively increasing the optical effect of the display panel during displaying.

In an embodiment of the present disclosure, one of the first barrier31and the second barrier32has a relatively large optical density, and the other one of the first barrier31and the second barrier32has a relatively large reflectivity. For example, the optical density of the first barrier31is greater than the optical density of the second barrier32, and the reflectivity of the second barrier32is greater than the reflectivity of the first barrier31.

In an example, as shown inFIG.2, the second substrate2further includes a black matrix6arranged around sub-pixels having different colors. The black matrix6is located at a space between two adjacent color changing layers20, and the apertures of the black matrix6correspond to the respective sub-pixels having different colors, thereby avoiding light leakage and color mixing between the sub-pixels having different colors. Moreover, the black matrix6can shield various structures in the display panel that are not used for light emission, including wires.

In an embodiment of the present disclosure, each of the optical density of the first barrier31and the optical density of the second barrier32may be greater than or equal to 1. With such configuration, when light having one color is radiated to an area of a sub-pixel having another color, the light can be absorbed more by the first barrier31and the second barrier32located between the areas of the two sub-pixels, thereby further decreasing light crosstalk between the sub-pixels having different colors.

In an embodiment of the present disclosure, each of the reflectivity of the first barrier31and the reflectivity of the second barrier32may be greater than or equal to 40%. With such configuration, when light emitted by the light-emitting unit10is radiated to the first barrier31and the second barrier32, most of the light can be reflected by the first barrier31and the second barrier32each having a relatively great reflectivity, thereby decreasing the loss of light emitted by the light-emitting unit10, and thus achieving that most of the light emitted by the light-emitting unit10can be utilized.

It should be noted that each of the optical density of the first barrier31and the optical density of the second barrier32is defined with respect to the light having a specific wavelength incident onto the first barrier31and the second barrier32. For example, if the light-emitting unit10is a Micro-LED that emits blue light, “each of the optical density of the first barrier31and the optical density of the second barrier32is greater than 1” means that each of the first barrier31and the second barrier32has an optical density greater than 1 with respect to blue light. If the light-emitting unit10emits other colors, “each of the optical density of the first barrier31and the optical density of the second barrier32is greater than 1” means that each of the first barrier31and the second barrier32has an optical density greater than 1 with respect to light having other colors. Similarly, the reflectivity is also defined with respect to light having a specific wavelength, which will not be repeated herein.

In an example, as shown inFIG.1, an orthographic projection of the first barrier31and the second barrier32onto a plane of the first substrate1at least partially surrounds the light-emitting units10, so that the first barrier31and the second barrier32can block the light radiated from an area of one sub-pixel towards a color changing layer20located in an area of another sub-pixel in a plurality of directions, thereby further alleviating crosstalk between light rays having different colors that may occur when the display panel performs displaying. Moreover, with such configuration, the light emitted by the light-emitting unit10can also be reflected in a plurality of directions, thereby increasing the light utilization efficiency of the light-emitting unit10.

It should be understood that an arrangement of the sub-pixels having respective colors shown inFIG.1is merely for illustration, and the arrangement of the sub-pixels can be designed differently according to different display requirements, which is not limited herein.

In an embodiment, as shown inFIG.1, the first barrier31and/or the second barrier32may be formed as a mesh structure including apertures. The apertures of the first barrier31or the second barrier32expose the color changing layers20.

The embodiments of the present disclosure provide a variety of different manners for arranging the first barrier31and the second barrier32, which will be described separately in the following.

In an embodiment, the first barrier31and the second barrier32are stacked. For example, as shown inFIG.2andFIG.3, the first barrier31may be disposed at a side of the second barrier32close to the second substrate2. Based on this arrangement manner, in an embodiment, the optical density of the first barrier31is greater than the optical density of the second barrier32, and the reflectivity of the second barrier32is greater than the reflectivity of the first barrier31.

Since the light-emitting unit10is provided at the side where the first substrate1is disposed, and the second barrier32having the relatively large reflectivity is arranged at the side where the first substrate1that provides the light source is disposed, light obliquely emitted by the light-emitting unit10of a certain sub-pixel can be reflected by the second barrier32disposed close to the first substrate1and then be used, thereby decreasing emission loss as a result of light absorption, and thus increasing the intensity of the light radiated out from the display panel.

In addition, in the embodiment of the present disclosure, since the first barrier31having the relatively large optical density instead of the second barrier32having the relatively large reflectivity is provided at the side where the second substrate2is disposed, if a part of light emitted by one sub-pixel is radiated toward the color changing layer20of another sub-pixel, this part of light will be absorbed by the first barrier31between the two adjacent sub-pixel areas, which reduces a probability of crosstalk between light having different colors. Here, light emitted by any sub-pixel includes light that is emitted from the light-emitting unit10of the sub-pixel but does not pass the color changing layer20of the sub-pixel, and further includes light radiated out from the color changing layer20of the sub-pixel.

For example, in a case where the display panel includes a red sub-pixel and a green sub-pixel that are adjacently arranged, and at a certain moment, it is required that the red sub-pixel emits light and the green sub-pixel does not emit light, the color changing layer20of the red sub-pixel and the color changing layer20of the green sub-pixel respectively includes a red color resist that only transmits red light and a green color resist that only transmits blue light, by filtering out light of other colors. The light-emitting unit10includes a white-light OLED. In an ideal case, the white-light OLED in the sub-pixel emits light, and the light emitted by the white-light OLED propagates to the red color resist, as shown by light B inFIG.2, to make the red sub-pixel emit red light; the white-light OLED in the green sub-pixel does not emit light, and the green sub-pixel does not emit light. However, the following situations may actually occur.

1. The white light emitted by the white-light OLED in the red sub-pixel and radiated to the red color resist is not effectively used, but propagates to the green color resist adjacent thereto, as shown by light D inFIG.2;

2. The light emitted by the white-light OLED in the red sub-pixel propagates to the green color resist adjacent thereto, as shown by light C inFIG.2;

3. The light emitted by the white-light OLED in the red sub-pixel propagates to the green sub-pixel adjacent thereto, as shown by light E inFIG.2.

If the situation 1 and situation 2 occur, the light emitted from the display panel after passing the green color resist will cause the green sub-pixel, which should not have emitted light, to emit light. However, in the embodiment of the present disclosure, because the first barrier31having a relatively large optical density is provided at the side where the second substrate2including the color changing layer20is disposed, even if the situation 1 and the situation 2 occur, the white light radiated towards the green color resist will be absorbed by the first barrier31before reaching the green color resist, thereby alleviating light crosstalk between different sub-pixels.

In addition, if more light E is radiated from the red sub-pixel to the green sub-pixel, as for the light-emitting unit10having a certain luminous intensity in the red sub-pixel, a proportion of light that is emitted therefrom and radiated to the red sub-pixel will decrease, and thus a luminous brightness of the red sub-pixel will be greatly affected. In the embodiment of the present disclosure, because the second barrier32having the relatively large reflectivity is provided at the side where the first substrate1(where the light-emitting unit10is provided) is disposed, if there is light propagating in the direction shown by the light E as exemplified in the above-mentioned situation 3, then the second barrier32can reflect the white light radiated towards the green sub-pixel to prevent the light E from entering the green sub-pixel. Moreover, it is of a high probability that light having a large viewing angle including the light E (i.e., light having a large angle with respect to a normal direction of the display panel) is radiated out by the red color resist after being reflected by the second barrier32. Therefore, with the second barrier32, not only the green sub-pixel will not have a light crosstalk issue, but also an intensity of the light emitted from the light-emitting unit10towards the red color resist will be increased, thereby increasing the luminous brightness of the red sub-pixel.

In the embodiments of the present disclosure, the arrangement of the first barrier31and the second barrier32can not only increase an optical effect of the display panel, but also function to support the display panel and avoid crushing the components including the light-emitting unit10inside the display panel, increasing pressure resistance of the display panel.

In an embodiment of the present disclosure, with further reference toFIG.2andFIG.3, the first barrier31includes a first surface311and a second surface312that are opposed to each other in the thickness direction of the display panel, and the second surface312is closer to the second substrate2than the first surface311. That is, the first surface311faces towards to the second barrier32. The second barrier32includes a third surface321and a fourth surface322that are opposed to each other in the thickness direction of the display panel, and the third surface321is closer to the first substrate1than the fourth surface322. That is, the fourth surface322faces towards the first barrier31. In the embodiment of the present disclosure, the fourth surface322of the second barrier32may contact the first surface311of the first barrier31, and an area of the fourth surface322is greater than or equal to an area of the first surface311. With such configuration, a stacking structure of the first barrier31and the second barrier32is more stable, thereby further increasing the pressure resistance of the display panel.

In a process for manufacturing the display panel, the first barrier31and the second barrier32may be formed in a process for manufacturing the first substrate1, or may be formed in a process for manufacturing the second substrate2; or the first barrier31close to the second substrate2is formed in a process for manufacturing the second substrate2, and the second barrier32close to the first substrate1is formed in a process for manufacturing the first substrate1, which will not be limited herein by the embodiments of the present disclosure.

After the first substrate1and the second substrate2are manufactured, the first substrate1and the second substrate2can be bonded together with an adhesive material. As shown inFIG.2andFIG.3, an optically clear adhesive (OCA)5can be used to bond the first substrate1and the second substrate2together.

In an embodiment, a total height of the first barrier31and the second barrier32is smaller than a distance between the first substrate1and the second substrate2, and the optically clear adhesive5is filled in the space between the third surface321of the second barrier32and the first substrate1, thereby improving bonding stability of the two substrates.

FIG.4is still another schematic cross-sectional view taken along AA′ line shown inFIG.1. In an embodiment, as shown inFIG.4, the second barrier32wraps at least an end of the first barrier31facing the first substrate1. When the display panel displays, the side with the second substrate2and serving as the light-exit side of the display panel, is usually disposed at an upper position. In this embodiment of the present disclosure, because the second barrier32arranged at a relatively lower position wraps an end of the first barrier31arranged at a relatively upper position, positional stability of the first barrier31and the second barrier32can be improved, thus increasing structural stability of the display panel.

FIG.5is still another schematic cross-sectional view taken along AA′ line shown inFIG.1. In an embodiment, as shown inFIG.5, the first barrier31contacts the second barrier32, and a surface of the first barrier31contacting the second barrier32, (i.e., the first surface311) includes a convex structure310; a surface of the second barrier32contacting the first barrier31(i.e., the fourth surface322) includes a concave structure320. The convex structure310is engaged with the concave structure320. Compared with the configuration in which the first surface311and the fourth surface322are flat surfaces, the configuration shownFIG.5can increase a contact area between the first barrier31and the second barrier32, so that the stacking structure of the first barrier31and the second barrier32can be more stable, reducing the risk of relative displacement between the first barrier31and the second barrier32when pressing or other operations is performed on the display panel. In an embodiment, the first surface311includes a plurality of convex structures310, and the fourth surface322includes a plurality of concave structures320.

In an embodiment, in the case where the color changing layer20includes the quantum dots202, the color changing layer20overlap the first barrier31in a direction parallel to the display panel, and the color changing layer20does not overlap the second barrier32in the direction parallel to the display panel.

FIG.6is a schematic flowchart of a manufacturing method of the second substrate according to an embodiment of the present disclosure. In a case where the first barrier31and the second barrier32are arranged at a side with the second substrate2, as shown inFIG.6, the manufacturing method includes the following steps S1to S4.

At step S1, a substrate200is provided.

At step S2, first barriers31, which are spaced from each other by a preset space, are formed on a side of the substrate200, and the first barriers31are disposed in a non-light-emitting area of the substrate200.

At step S3, second barriers32are formed on a side of the first barriers31facing away from the substrate200.

At step S4, a color changing layer20including quantum dots is formed in the space between adjacent first barriers31. An initial state of the quantum dots is generally in liquid form. Processes such as spin coating or printing are generally used to form the quantum dots in the space between adjacent first barriers31. Since the first barrier31is made of a different material from the second barrier32, wettability of the liquid quantum dot material to the first barrier31is different from wettability of the liquid quantum dot material to the second barrier32. With the method provided by the embodiment of the present disclosure, by controlling heights of the quantum dots and the first barrier31in such a manner that the color changing layer20including the quantum dots overlaps only the first barrier31and does not overlap the second barrier32in a direction parallel to the display panel, the liquid quantum dot material does not contact an interface between the first barrier31and the second barrier32, avoiding a problem of poor contact, e.g., bubbles at an edge of the quantum dots caused by difference in wettability of the quantum dots to the first barrier31and to the second barrier32.

It should be noted that, in the schematic flowchart shown inFIG.6, the manufacturing method of the second substrate2is only described by taking the color changing layer20being a single layer structure as an example, and the color changing layer20may be a stacking structure including a color resist and quantum dots, which will not be repeated herein.

In an embodiment of the present disclosure, with reference toFIG.2, in a direction parallel to the display panel, a height d1 of an overlapping area between the color changing layer20and the first barrier31and a height d2 of the color changing layer20satisfy: d1≥0.5*d2. With such configuration, the light radiated from the color changing layer20can be better confined in an area of the sub-pixel having the corresponding color by the first barrier31, thereby further avoiding crosstalk between light having different colors.

In an embodiment, the first barrier31and the color changing layer20completely overlap each other in a direction parallel to the display panel, that is, d1=d2. In other words, the color changing layer20is arranged between a plane of the first surface311of the first barrier31and a plane of the second surface312of the first barrier31, so that the horizontal light radiated from the color changing layer20can be confined in an area of the corresponding sub-pixel to the maximum extent.

In an embodiment, as shown inFIG.2, in a direction parallel to the display panel, a width W2 of the second barrier32is greater than a width W1 of the first barrier31. Because the second barrier32has a relatively large width, the second barrier32has an increased blocking effect on the light radiated thereto. If light propagates between two adjacent sub-pixels, the second barrier32with strong light blocking effect can reduce a probability of light propagating from one sub-pixel to another sub-pixel, thereby further avoiding light crosstalk between the two adjacent sub-pixels. Moreover, as a distance between the second barrier32and the color changing layer20is relatively large, and an area of the color changing layer20is determined by a distance between two adjacent first barriers31, in this embodiment of the present disclosure, increasing the width of the second barrier32not only reduces light crosstalk between two adjacent sub-pixels, but also achieves that the area of the color changing layer20will not decrease, that is, a required aperture ratio of the sub-pixels can be achieved.

FIG.7is still another schematic cross-sectional view taken along AA′ line shown inFIG.1. As shown inFIG.7, in an embodiment of the present disclosure, an area of the first surface311of the first barrier31is greater than or equal to an area of the second surface312of the first barrier31, that is, a cross-sectional shape of the first barrier31is designed as a trapezoid as shown inFIG.7, with an upper bottom of the trapezoid facing the second substrate2and a lower bottom of the trapezoid facing the first substrate1. Here, the upper bottom of the trapezoid refers to a bottom side of the trapezoid having a relatively small length, and the lower bottom of the trapezoid refers to a bottom side of the trapezoid having a relatively large length. With such configuration, when the first substrate1and the second substrate2are bonded together to form the display panel, during the process that the emitted light is radiated from the light-emitting unit10towards the light-exit side of the display panel, an aperture defined by two adjacent first barriers31has an opening area gradually increasing in a direction from the first surface311towards the second surface312, which can increase an light-exit angle of the light, thus increasing the viewing angle of the display panel and improving the optical effect under a large viewing angle. Moreover, with such a configuration, an aperture defined by two adjacent first barriers31has an opening area gradually increasing in a direction from the first surface311towards the second surface312, and if a part of light emitted from the color changing layer20is scattered or reflected to cause a change of a propagation direction thereof and the changed propagation direction is closer to the side where the first substrate1is disposed, this part of light will pass the apertures having a gradually increasing area during propagating from the color changing layer20towards the side where the first substrate1is disposed, and therefore this part of light can be absorbed more by the first barrier31defining the aperture, thereby reducing an intensity of the part of light reaching the side where the first substrate1is disposed without affecting a dimension of the aperture of the pixel of the display panel.

In addition, in the embodiment of the present disclosure, with the cross-sectional shape of the first barrier31designed as a trapezoid as shown inFIG.7, a contact area between the first barrier31and the second barrier32is relatively increased, and therefore structural stability of the first barrier31and the second barrier32is increased, thereby increasing structural stability of the display panel.

FIG.8is still another schematic cross-sectional view taken along AA′ line shown inFIG.1. In an embodiment, as shown inFIG.8, an area of the third surface321of the second barrier32is smaller than or equal to an area of the fourth surface322of the second barrier32, that is, a cross-sectional shape of the second barrier32is designed as an inverted trapezoid as shown inFIG.8, with an upper bottom of the trapezoid facing the first substrate1and a lower bottom of the trapezoid facing the second substrate2. Here, the upper bottom of the trapezoid refers to a bottom side of the trapezoid having a relatively small length, and the lower bottom of the trapezoid refers to a bottom side of the trapezoid having a relatively large length. With such configuration, a width of the second barrier32gradually increases along a direction from the third surface321towards the fourth surface322. Compared with a case in which the width of the second barrier32decreases along the direction from the third surface321towards the fourth surface322, i.e., comparingFIG.9andFIG.10(FIG.9is a schematic diagram showing that light emitted by a light-emitting unit passes a second barrier having a cross section in an inverted trapezoidal shape; andFIG.10is a schematic diagram showing that light emitted by the light-emitting unit passes a second barrier having a cross section in a regular trapezoidal shape), it can be seen that, in the two configurations, a horizontal distance between the second barrier32and an edge of the light-emitting unit10has an identical value of M, and a vertical distance between an upper surface of the second barrier32and a light-exit surface of the light-emitting unit10has an identical value of L; and both the light G and light H emitted by the light-emitting unit10shown inFIG.9can pass the second barrier32, but light G and light H that are emitted by the light-emitting unit10shown inFIG.10and have the same propagation directions as inFIG.9cannot be reflected by the second barrier32and may be radiated to a sub-pixel at another position. Therefore, it can be seen that the second barrier32having an inverted trapezoidal cross-sectional shape can reflect more light obliquely emitted by the light-emitting unit10, thereby more effectively improving utilization of light emitted by the light-emitting unit10, and thus decreasing the loss of light emitted by the light-emitting unit10.

Moreover, while achieving that the light having a large angle emitted by the light-emitting unit10is reflected, the design of the second barrier32having an inverted trapezoidal cross-sectional shape as shown inFIG.8andFIG.9can decrease an area of an end of the second barrier32close to the first substrate1compared with the design of the second barrier having a rectangular cross-sectional shape. In the embodiments of the present disclosure, when the light-emitting unit10is a Micro-LED, due to a small size of the Micro-LED and high process accuracy requirements, in the process for forming the display panel, especially when the process for forming the second barrier32is integrated into the process for manufacturing the first substrate1(i.e., the second barrier32is formed at the side where the first substrate1is disposed), the second barrier32having a smaller area at a side close to the first substrate1can decrease an influence on the Micro-LED. When the process for the second barrier32is integrated into the process for manufacturing the second substrate2(i.e., the second barrier32is formed at the side where the second substrate2is disposed), during the alignment and bonding process after the first substrate1and the second substrate2are manufactured, the second barrier32having a smaller area at a side close to the first substrate1can avoid blocking the Micro-LED, and also allows more easier alignment of the second barrier32with a gap between two adjacent Micro-LEDs.

FIG.11is still another schematic cross-sectional view taken along AA′ line shown inFIG.1. Alternatively, in some embodiments of the present disclosure, as shown inFIG.11, identical features in the embodiment shown inFIG.11with the foregoing embodiments will not be repeated herein, and the difference from the foregoing embodiments lies in that: the optical density of the first barrier31close to the second substrate2is smaller than the optical density of the second barrier32close to the first substrate1, and the reflectivity of the second barrier32close to the first substrate1is smaller than the reflectivity of the first barrier31close to the second substrate2. With such configuration, when the light-emitting units10of the sub-pixels have the same emission color, and the color changing layers20of the sub-pixels each have a material that is selective to the color of the incident light, light crosstalk between the light-emitting units10of different sub-pixels can be avoided, thereby ameliorating light crosstalk between the sub-pixels having different colors.

In an embodiment, the display panel includes a red sub-pixel and a green sub-pixel that are adjacently arranged, the color changing layer20of each of the red sub-pixel and the green sub-pixel includes quantum dots, and the light-emitting unit10of each of the red sub-pixel and the green sub-pixel includes blue-light Micro-LED. When it is required that the red sub-pixel emits light and the green sub-pixel does not emit light at a certain moment, in a ideal case, the blue-light Micro-LED in the red sub-pixel emits light, and the light emitted by the blue-light Micro-LED propagates to the red quantum dots, as shown by light B inFIG.2, to excite the red quantum dots to emit red light; and the blue-light Micro-LED in the green sub-pixel does not emit light, the green quantum dots are not excited, and therefore the green sub-pixel does not emit light. However, the following situation may actually occur: a part of blue light emitted by the blue-light Micro-LED in the red sub-pixel propagates to a position of the blue-light Micro-LED of the green sub-pixel adjacent thereto, as shown by light F inFIG.11, and if this part of blue light propagates toward the light-exit side of the display panel, it will be radiated to the green quantum dots. The green quantum dots will be excited to emit green light, causing the green sub-pixel which should have not emitted light, to emit light.

In the embodiment of the present disclosure, since the second barrier32having the relatively large optical density is provided at the side where the first substrate1including the light-emitting unit10is disposed, the blue light radiated to the light-emitting unit of the green sub-pixel can be absorbed by the second barrier32, thereby avoiding radiating this part of blue light subsequently to the green quantum dots, and thus alleviating light crosstalk between different sub-pixels.

In an embodiment, as shown inFIG.11, the second barrier32overlaps the light-emitting unit10in a direction parallel to the display panel, so that the light emitted by the light-emitting unit10and having a large angle with respect to the normal direction of the display panel can be absorbed more by the second barrier32, thereby further avoiding crosstalk between light having different colors. In an embodiment of the present disclosure, the light-emitting unit10completely overlaps the second barrier32in the direction parallel to the display panel, that is, the light-emitting unit10is arranged between a plane of the third surface321of the second barrier32and a plane of the fourth surface322of the second barrier32, so that the light emitted from the light-emitting unit10and having the large angle can be confined in an area of the corresponding sub-pixel to the maximum extent.

In addition, with the above-mentioned configuration, if a part of red light excited from the red quantum dots propagates to the green quantum dots adjacent thereto, as shown by light D shown inFIG.11, since the green quantum dots will not be excited by the red light, this part of red light will have a small influence on color crosstalk. Therefore, in this embodiment of the present disclosure, by providing the first barrier31having a relatively large reflectivity at the side where the second substrate2including the color changing layer20is disposed, the part of red light emitted from the red quantum dots can be confined in an area of the red sub-pixel due to reflection of the first barrier31. In this way, loss of red light can be reduced, thus improving the emission brightness of the red sub-pixel.

The above description is an exemplary description of the structure of the display panel provided by the embodiments of the present disclosure by taking the stacking structure of the first barrier31and the second barrier32as an example. In addition, in an embodiment of the present disclosure, the height of the second barrier32may be greater than or equal to the height of the first barrier31, and the second barrier32at least partially wraps the first barrier31.

FIG.12is still another schematic cross-sectional view along AA′ shown inFIG.1. In an embodiment, as shown inFIG.12, in the thickness direction of the display panel, the height of the second barrier32is greater than or equal to the height of the first barrier31, and the second barrier32at least partially wraps the first barrier31. In the embodiment shown inFIG.12, in the direction parallel to the display panel, the width of the second barrier32is greater than the width of the first barrier31; the first surface311of the first barrier31and the two side surfaces connected to the first surface311are all wrapped by the second barrier32; and the distance between the first barrier31and the second substrate2is smaller than or equal to the distance between the first barrier31and the first substrate1. In an embodiment of the present disclosure, based on the configuration shown inFIG.12, the optical density of the first barrier31is greater than the optical density of the second barrier32, and the reflectivity of the second barrier32is greater than the reflectivity of the second barrier32.

With such configuration, the first barrier31having a relatively large optical density can be used to absorb the light that is emitted from an area of a certain sub-pixel and propagates obliquely to the color changing layer20of another sub-pixel, thereby decreasing optical crosstalk between the sub-pixels of different colors in the display panel; meanwhile, the barrier having a relatively large reflectivity can be used to reflect the light that is emitted from the light-emitting unit10and is not radiated to the corresponding color changing layer20but is directly radiated to the barrier, and the reflected light can be radiated to the corresponding color changing layer20and then radiated out from the light-exit side of the display panel, thereby increasing a light extraction efficiency of the light-emitting unit10and thus increasing the emission brightness of the display panel. Moreover, with the structure shown inFIG.12, a contact area between the first barrier31and the second barrier32can further increase, further improving the positional stability of the first barrier31and the second barrier32.

FIG.13is still another schematic cross-sectional view taken along AA′ line shown inFIG.1. In an embodiment as shown inFIG.13, on the basis that the height of the second barrier32is greater than or equal to the height of the first barrier31, and the second barrier32at least partially wraps the first barrier31, an area of the first surface311of the first barrier31is greater than or equal to an area of the second surface312of the first barrier31, thereby increasing the light-exit angle of the light, thus increasing the viewing angle of the display panel and improving the optical effect under the large viewing angle. Moreover, with the configuration shown inFIG.13, the first barrier31and the second barrier32may form a locking structure, thereby further improving the positional stability of the first barrier31and the second barrier32and thus preventing relative displacement between the first barrier31and the second barrier32.

With further reference toFIG.13, an embodiment of the present disclosure can provide that an area of the third surface321of the second barrier32is smaller than or equal to an area of the fourth surface322of the second barrier32, so as to reflect more light obliquely emitted from the light-emitting unit10, thereby further increasing utilization of the light emitted from the light-emitting unit10, and thus further decreasing loss of the light emitted from the light-emitting unit10.

In an embodiment, in the process for manufacturing the display panel designed as shown inFIG.12andFIG.13, if the light-emitting unit is a blue-light Micro-LED, an embodiment of the present disclosure can provide that the process for forming the first barrier31and the second barrier32is integrated into the process for forming the second substrate2. Compared with the scheme in which the process for forming the first barrier31and the second barrier32is integrated into the process for forming the first substrate1, this embodiment can prevent the process for forming the first barrier31and the second barrier32from affecting the process of the Micro-LED at the side where the first substrate1is disposed. Due to a small size of the Micro-LED, process difficulty and process requirements of the Micro-LED are relatively large. Therefore, this embodiment of the present disclosure can improve reliability of the manufactured display panel by avoiding forming the first barrier31and the second barrier32at the side where the first substrate1is disposed.

In addition, in the process for manufacturing the display panel with the configuration as shown inFIG.12andFIG.13, integrating the process for forming the first barrier31and the second barrier32into the process for forming the second substrate2can reduce the distance between the first and second barrier31,32and the color changing layer20at the side where the second substrate2is disposed, with respect to the light-emitting unit10at the side where the substrate1is disposed. Since the color changing layer20is closely related to the color of the light emitted from the sub-pixel, this configuration can reduce crosstalk between light rays emitted from different sub-pixels to the maximum extent.

With reference to the above embodiments, in order to make the first barrier31and the second barrier32meet the requirements in optical density and reflectivity as described above, in a process for forming the first barrier31and the second barrier32, doping particles of different particle sizes or different materials may be doped in the base materials forming the first barrier31and the second barrier32. The difference in the particle size or material of the doped particles can provide different optical effects on the light radiated thereto. For example, the first barrier31may have a yellow color due to the selected particle sizes of the doping particles, so that the second barrier32can have a gray color. In the case where the light-emitting unit is a blue-light Micro-LED, the first barrier31having a yellow color has a higher absorption rate for blue light, and the second barrier32having a gray color has a higher reflectivity to blue light.

An embodiment of the present disclosure further provides a display device, as shown inFIG.14, which is a schematic diagram of a display device according to an embodiment of the present disclosure. The display device includes the display panel described above. Here, the structure of the display panel100has been described in detail in the above embodiments, and will not be repeated herein. It should be noted that the display device shown inFIG.14is merely for schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper book, or a television.

With the display device provided by the embodiments of the present disclosure, the barrier having a relatively large optical density can be used to absorb the light that is emitted from an area of a certain sub-pixel and propagates obliquely to the color changing layer of another sub-pixel, thereby decreasing crosstalk between light rays emitted from the sub-pixels having different colors in the display panel; meanwhile, the barrier having a relatively large reflectivity can be used to reflect the light that is emitted from the light-emitting unit and is not radiated to the corresponding color changing layer but is directly radiated to the barrier, and the reflected light can be radiated to the corresponding color changing layer and then radiated out from the light-exit side of the display panel, thereby increasing a light extraction efficiency of the light-emitting unit10and thus increasing the luminous brightness of the display panel. In other words, with the embodiments of the present disclosure, both the required chromaticity and the required brightness of the display device can be achieved, thereby effectively improving the optical effect of the display device during displaying.

The above-described embodiments are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions and improvements made within the principle of the present disclosure shall fall into the protection scope of the present disclosure.