DISPLAY PANEL AND DISPLAY APPARATUS

A display panel and a display apparatus. The display panel includes: a substrate; a light-emitting element disposed on the substrate; an encapsulation layer on a side of the light-emitting element away from the substrate, where the encapsulation layer includes a first inorganic film layer, a first auxiliary film layer and an organic film layer stacked on the light-emitting element, an absolute value of a difference between a refractive index of the first inorganic film layer and a refractive index of the first auxiliary film layer is less than or equal to 0.05, and an extinction coefficient of the first auxiliary film layer for visible light is less than an extinction coefficient of the first inorganic film layer for visible light.

TECHNICAL FIELD

The present application relates to the field of display, and particularly relates to a display panel and a display apparatus.

BACKGROUND

An organic light emitting diode (OLED) display panel has the advantages of high color gamut, flexibility and fast response, and its market share increases year by year. Users are increasingly demanding on the display effect of the OLED display panel. However, since the thickness of various film layers in the device and package fluctuates continuously with the evaporation cycles, the non-uniformity of film thickness in the OLED display panel will aggravate the discreteness of viewing angle characteristics of the OLED display panel, causing the OLED display panel to have problems such as cyan tint displaying and pink tint displaying in certain viewing angles.

Therefore, there is an urgent need for a new display panel and a new display apparatus.

SUMMARY

Embodiments of the present application provide a display panel and a display apparatus, in order to improve the display effect of the display panel.

A first aspect of the embodiments of the present application provides a display panel including: a substrate; a light-emitting element, disposed on the substrate; an encapsulation layer on a side of the light-emitting element away from the substrate, where the encapsulation layer includes a first inorganic film layer, a first auxiliary film layer and an organic film layer that are stacked on the light-emitting element, an absolute value of a difference between a refractive index of the first inorganic film layer and a refractive index of the first auxiliary film layer is less than or equal to 0.05, and an extinction coefficient of the first auxiliary film layer for visible light is less than an extinction coefficient of the first inorganic film layer for visible light.

A second aspect of the embodiments of the present application provides a display apparatus including the display panel according to any one of the above implementations.

In the display panel according to the embodiments of the present application, the display panel includes the substrate, the light-emitting element disposed on the substrate, and the encapsulation layer configured to encapsulate the light-emitting element. The encapsulation layer can prevent penetration of water and oxygen and improve the service life of the light-emitting element. The encapsulation layer includes the first inorganic film layer, the first auxiliary film layer and the organic film layer. The absolute value of the difference between the refractive indices of the first inorganic film layer and the first auxiliary film layer is less than or equal to 0.05. That is, the refractive indices of the first inorganic film layer and the first auxiliary film layer are close, so that the light reflected by the contact interface between the first inorganic film layer and the first auxiliary film layer can be reduced. Thus, the thickness of the first inorganic film layer no longer has a great influence on the viewing angle characteristics, which mitigates the color shift between viewing angles or uneven color rendering caused by the uneven thickness of the first inorganic film layer, and improves the display effect of the display panel. In addition, the extinction coefficient of the first auxiliary film layer for visible light is less than the extinction coefficient of the first inorganic film layer for visible light, which can reduce the influence of the additional first auxiliary film layer on the light output of the display panel. Therefore, the embodiments of the present application can improve the display effect of the display panel on the premise of ensuring enough light output of the display panel.

DETAILED DESCRIPTION

Reference will now be made in detail to the features and exemplary embodiments of the various aspects of the present application, and in order that the objects, aspects and advantages of the present application will become more apparent, a more particular description of the present application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It should be understood that the specific embodiments described herein are to be construed as merely illustrative, and not limitative of the remainder of the disclosure. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely provided to provide a better understanding of the application by illustrating examples of the invention.

An organic light emitting diode (OLED) display panel100has the advantages of high color gamut, flexibility and fast response, and its market share increases year by year. Users are increasingly demanding on the display effect of the OLED panel.

In the OLED display panel, the thickness of various film layers in the light-emitting device layer and the encapsulation layer is non-uniform. Especially, when the thickness of various film layers in the encapsulation layer is non-uniform, the discreteness of the viewing angle characteristics of the OLED display panel will be aggravated, causing the OLED display panel to have problems such as cyan and pink viewing angles. In the actual manufacturing process of the OLED display panel, although the yield loss can be recovered to a certain extent by improving the uniformity of the film layers and monitoring the chromaticity, the discreteness still cannot be fundamentally solved.

With reference toFIG. 1, an OLED display panel100′ includes a light-emitting element20′ and an encapsulation layer30′ on the light-emitting element20′. The encapsulation layer30′ includes a first inorganic film layer31′, an organic film layer33′ and a second inorganic film layer35′ that are sequentially stacked. A contact interface between the first inorganic film layer31′ and the organic film layer33′ can reflect light emitted by the light-emitting element20′. When the first inorganic film layer31′ is not uniform in thickness, the light reflected by the contact interface between the first inorganic film layer31′ and the organic film layer33′ is not uniform. Thus, fluctuations in the thickness of the first inorganic layer in the encapsulation layer30′ on the light-emitting device22′ in the display panel100′ have a significant influence on trajectory of white light as well as the color shift between viewing angles. This leads to an increased probability of occurrence of pink tint displaying in a small viewing angle and cyan tint displaying in a large viewing angle and causes yield loss. Therefore, it is necessary to improve the display panel100′ to reduce the sensitivity of the viewing angle characteristics to the thickness of film layer.

Embodiments of the present application provide a display panel that may be an organic light emitting diode (OLED) display panel.

With reference toFIG. 2andFIG. 3, a display panel100according to an embodiment of the present application includes a display area AA and a non-display area NA. In other embodiments, the display panel100may be a full-screen display panel100including the display area AA.

The display panel100includes a plurality of sub-pixels110, for example a red sub-pixel111, a blue sub-pixel113and a green sub-pixel112. In other embodiments, the plurality of sub-pixels110may include a yellow sub-pixel, for example.

With reference toFIG. 4, the display panel100includes a substrate10, a light-emitting element20on the substrate10, and an encapsulation layer30on a side of the light-emitting element20away from the substrate10. The encapsulation layer30includes a first inorganic film layer31, a first auxiliary film layer32and an organic film layer33that are sequentially stacked on the light-emitting element20. An absolute value of a difference between a refractive index of the first inorganic film layer31and a refractive index of the first auxiliary film layer32is less than or equal to 0.05. An extinction coefficient of the first auxiliary film layer32for visible light is less than an extinction coefficient of the first inorganic film layer31for visible light.

The encapsulation layer30is configured to encapsulate the light-emitting element20, and can prevent penetration of water and oxygen and improve the service life of the light-emitting element20. The absolute value of the difference between the refractive indices of the first inorganic film layer31and the first auxiliary film layer32being less than or equal to 0.05 means that the refractive indices of the first inorganic film layer31and the first auxiliary film layer32are close and the light reflected by the contact interface between the first inorganic film layer31and the first auxiliary film layer32can be reduced. Thus, the thickness of the first inorganic film layer31no longer has a great influence on the viewing angle characteristics, and the color shift between viewing angles or color rendering unevenness caused by the uneven thickness of the first inorganic film layer31is mitigated, thereby improving the display effect of the display panel100.

In addition, since the extinction coefficient of the first auxiliary film layer32for visible light is less than the extinction coefficient of the first inorganic film layer31for visible light, the influence of the additional first auxiliary film layer32on the light output of the display panel100can be reduced. Therefore, the embodiments of the present application can improve the display effect of the display panel100on the premise of ensuring enough light output of the display panel100.

Extinction coefficient refers to the amount of light absorbed by an object to be tested (e.g., the first inorganic film layer31). The extinction coefficient characterizes the capability of the object to be tested to absorb light. The greater the extinction coefficient, the greater the capability of the object to be tested to absorb light, and the less the amount of light emitted through the object to be tested. On the contrary, the smaller the extinction coefficient is, the weaker the capability of the object to be tested to absorb light, and the more the amount of light emitted through the object to be tested.

Optionally, in some embodiments, a light extraction layer and a light modulation layer are disposed between the light-emitting element20and the encapsulation layer30. The light modulation layer may for example be a lithium fluoride layer, to improve the light extraction efficiency of the display panel100.

The substrate10may be made of a light-transmitting material such as glass, polyimide (PI), etc. The light-emitting element20includes, for example, a driving device and a light-emitting device. The driving device may for example include a pixel driving circuit. The light-emitting device includes, for example, a first electrode layer, a light-emitting structure layer, and a second electrode layer.

In some embodiments, the light-emitting structure layer may further include at least one of a hole injection layer, a hole transport layer, an electron injection layer, or an electron transport layer, depending on design requirements.

The first electrode layer may be a light-transmitting electrode, and the first electrode layer may include an indium tin oxide (ITO) layer or an indium zinc oxide layer. Alternatively, the first electrode layer may be a reflective electrode layer, including a first light-transmitting conductive layer, a reflective layer on the first light-transmitting conductive layer, and a second light-transmitting conductive layer on the reflective layer. The first light-transmitting conductive layer and the second light-transmitting conductive layer may be ITO, indium zinc oxide, etc. The reflective layer may be a metal layer, for example made of a silver material. The second electrode layer may include a magnesium-silver alloy layer.

For example, the display panel100may further include a polarizer and a cover plate disposed over the encapsulation layer30, or the cover plate may be disposed directly over the encapsulation layer30without the polarizer. In some optional embodiments, a touch electrode may be disposed over encapsulation layer30.

Optionally, the refractive index of the first auxiliary film layer32is less than or equal to the refractive index of the first inorganic film layer31.

In some embodiments, the first auxiliary film layer32has a refractive index of 1.7-1.8. Optionally, the refractive index of the first auxiliary film layer32is equal to the refractive index of the first inorganic film layer31.

In these optional embodiments, the refractive index of the first auxiliary film layer32and the refractive index of the first inorganic film layer31are equal, which can reduce the reflected light generated when the light of the light-emitting element20passes through the contact interface between the first auxiliary film layer32and the first inorganic film layer31, mitigate the color shift between viewing angles or color rendering unevenness of the display panel100due to the uneven thickness of the first inorganic film layer31, and further improve the display effect of the display panel100.

In some embodiments, the first auxiliary film layer32and the first inorganic film layer31each have a refractive index of 1.75. According to the experimental measurement, when the refractive indices of the first auxiliary film layer32and the first inorganic film layer31are both 1.75, it can ensure that the first inorganic film layer31has a good protective effect and avoids the invasion of water and oxygen, and can also ensure that the first inorganic film layer31has a good bending performance and improve the bending performance of the display panel100. The first auxiliary film layer32and the first inorganic film layer31both have a refractive index of 1.75, which can mitigate the color shift between viewing angles or color rendering unevenness of the display panel100due to the uneven thickness of the first inorganic film layer31, and further improve the display effect of the display panel100.

In some optional embodiments, the first inorganic film layer31has an extinction coefficient for visible light ranging from 0.0006 to 0.0110, and the first auxiliary film layer32has an extinction coefficient for visible light ranging from 0.00002 to 0.0010. In these embodiments, when the extinction coefficients of the first inorganic film layer31and the first auxiliary film layer32are within the above ranges, enough light output of the display panel100can be ensured, thereby improving the display effect of the display panel100.

In some embodiments, the first inorganic film layer31has an extinction coefficient for red light in a range of 0.0006 to 0.0018, and the first auxiliary film layer32has an extinction coefficient for red light in a range of 0.00002 to 0.00006. In these embodiments, the first auxiliary film layer32has a relatively low extinction coefficient for red light, which ensures enough light output of the display panel100for red light.

In some embodiments, the first inorganic film layer31has an extinction coefficient for green light in a range of 0.002 to 0.0037, and first auxiliary film layer32has an extinction coefficient for green light in a range of 0.00003 to 0.00008. In these optional embodiments, the first auxiliary film layer32has a relatively low extinction coefficient for green light, which ensures enough light output of the display panel100for green light.

In some embodiments, the first inorganic film layer31has an extinction coefficient for blue light in a range from 0.0039 to 0.0059, and first auxiliary film layer32has an extinction coefficient for blue light (light having a wavelength ranging from 492 nm to 455 nm) in a range from 0.002 to 0.001. In these embodiments, the first auxiliary film layer32has a relatively low extinction coefficient for blue light, which ensures enough light output of the display panel100for blue light.

The organic film layer33may be formed by various processes, and the organic film layer33may be formed by, for example, ink-jet printing.

With reference toFIG. 5, the first auxiliary film layer32may be arranged in various manners. For example, the first auxiliary film layer32may formed by laying the whole layer. The first auxiliary film layer32may be formed by laying an organic material, that is, the first auxiliary film layer32is an organic material-made auxiliary film layer. The first auxiliary film layer32is made of an organic material, so that the first auxiliary film layer32may be made by a same process as the organic film layer33. In the forming process of the display panel100, after the first auxiliary film layer32is formed, the organic film layer33can be continuously formed without moving and replacing the ink-jet printing apparatus, which can simplify the process flow and improve the forming efficiency of the display panel100.

Optionally, the first auxiliary film layer32and the organic film layer33have the same composition. This allows the organic film layer33to be sequentially formed after the first auxiliary film layer32has been formed by simply changing the parameters of the inkjet printing apparatus.

In some embodiments, the thickness of the first auxiliary film layer32ranges from 1 μm to 10 μm. It has been experimentally determined that when the thickness of the first auxiliary film layer32is within the above thickness range, the light reflection between the first inorganic film layer31and the first auxiliary film layer32can be well improved without affecting other properties of the display panel100.

Optionally, the thickness of the first auxiliary film layer32is 2 μm.

In some optional embodiments, the material of the first auxiliary film layer32includes one or more of a semi-alicyclic polyimide, a phenylquinoxaline-based polymer, a methallyl-type mercapto ester group-containing monomer, a poly (2-methallyl benzothiazole mercapto ester), and a siloxane compound.

With further reference toFIG. 6, in some embodiments, the first auxiliary film layer32is a nanoparticle layer, and the first auxiliary film layer32includes a plurality of nanoparticles321. In these embodiments, the first auxiliary film layer32includes a plurality of nanoparticles321, which may reflect light emitted by the lighting unit20. In addition, since the nanoparticles321are generally spherical, the light rays reflected by the nanoparticles321exit in different directions, and thus the reflected light rays of the nanoparticles321do not overlap one another, thereby mitigating the color shift between viewing angles or uneven color rendering of the display panel100due to the uneven thickness of the first inorganic film layer31, and improving the display effect of the display panel100.

In some optional embodiments, a diameter d of the nanoparticle321is in a range of 0.1 μm and 10 μm.

In some embodiments, in a thickness direction of the display panel100, the an area of orthographic projections of the plurality of nanoparticles321in the nanoparticle layer is greater than or equal to 50% of an area of orthographic projection of the first inorganic film layer31.

In these embodiments, the area of the orthographic projections of the nanoparticles321is greater than or equal to 50% of the area of the orthographic projection of the first inorganic film layer31, which can ensure that sufficient nanoparticles321are covered on the first inorganic film layer31, and ensure that the light reflected by the nanoparticles321is sufficient, thereby better mitigating the color shift between viewing angles or uneven color rendering of the display panel100due to uneven thickness of the first inorganic film layer31, and improving the display effect of the display panel100.

In some embodiments, the nanoparticles321are uniformly distributed on the first inorganic film layer31. In these embodiments, it can be ensured that the reflected light formed by the nanoparticles321is dispersed at different positions on the first inorganic film layer31, further improving the display effect of the display panel100.

The uniform distribution of the nanoparticles321on the first inorganic film layer31is not strictly uniform in a mathematical sense, but within an error range. The nanoparticles321are uniformly distributed on the first inorganic film layer31as long as the reflected light formed by the reflection of the nanoparticles321is sufficiently dispersed.

In some embodiments, the nanoparticle layer has a thickness less than or equal to 2d. In these optional embodiments, the thickness of the nanoparticles321is less than or equal to 2d. That is, one nanoparticle layer or two nanoparticle layers are laid on the first inorganic film layer31, which can ensure that the nanoparticle layer can mitigate the color shift between viewing angles or color rendering unevenness of the display panel100due to the uneven thickness of the first inorganic film layer31, and can also reduce the process difficulty and save the manufacturing time of the display panel100.

In some embodiments, the material of the nanoparticles321includes one or both of zinc oxide (ZnO) and titanium dioxide (TiO2).

In some embodiments, the display panel further includes a combined structure layer on a side of the first auxiliary film layer32away from the first inorganic film layer31. The combined structure layer includes a first structure layer, a second structure layer and a third structure layer that are stacked in the light extraction direction. The refractive indices of the first structure layer, the second structure layer and the third structure layer satisfies the following equation:

where n1is the refractive index of the first structure layer, n2is the refractive index of the second structure layer, and n3is the refractive index of the third structure layer.

In these embodiments, when the refractive indices of the first structure layer, the second structure layer and the third structure layer satisfy the above-mentioned relationship, the light transmittance of the combined structure layer formed by combining the first structure layer, the second structure layer and the third structure layer can be effectively increased, the light transmittance of the display panel100can be further increased, and the power consumption of the display panel100can be improved.

With reference toFIG. 7, in some embodiments, the display panel100further includes a second inorganic film layer34and a third inorganic film layer35on the side of the organic film layer33away from the first auxiliary film layer32. The refractive index of the second inorganic film layer34is greater than the refractive index of the organic film layer33, and the refractive index of the third inorganic film layer35is greater than the refractive index of the second inorganic film layer34.

In these embodiments, a second inorganic film layer34is arranged between the organic film layer33and the third inorganic film layer35and has a refractive index between those of the organic film layer33and the third inorganic film layer35. The refractive index of the second inorganic film layer34is closer to the refractive index of the organic film layer33than the refractive index of the third inorganic film layer35, so that the light transmittance of the display panel100can be increased and the power consumption of the display panel100can be improved. In addition, the light reflected by the contact interface between the organic film layer33and the second inorganic film layer34and the light reflected by the contact interface between the second inorganic film layer34and the third inorganic film layer35may interfere with each other, so as to mitigate the color shift between viewing angles or uneven color rendering of the display panel100due to uneven thickness of the organic film layer33, reduce the color shift of the display panel100and improve the display effect of the display panel100.

Optionally, the combined structure layer is provided in the encapsulation layer30, and the first structure layer is the organic film layer33, the second structure layer is the second inorganic film layer34, and the third structure layer is the third inorganic film layer35. That is, the refractive indexes of the organic film layer33, the second inorganic film layer34and the third inorganic film layer35satisfy the following equation:

where nw2is the refractive index of the second inorganic film layer34, nyis the refractive index of the organic film layer33, and nw3is the refractive index of the third inorganic film layer35.

When the refractive indexes of the organic film layer33, the second inorganic film layer34and the third inorganic film layer35satisfy the above-mentioned relationship, the light transmittance of the organic film layer33, the second inorganic film layer34and the third inorganic film layer35can be effectively increased, the light transmittance of the display panel100can be further increased, and the power consumption of the display panel100can be improved.

In some embodiments, the second inorganic film layer has a refractive index ranging from 1.60 to 1.70. Optionally, the second inorganic film layer has a refractive index of 1.64. For example, if the organic film layer33has a refractive index of 1.5 and the third inorganic film layer35has a refractive index of 1.78, then second inorganic film layer34may have a refractive index of 1.64.

In some embodiments, the second inorganic film layer34has a thickness ranging from 80 nm to 100 nm. Optionally, the second inorganic film layer34has a thickness of 90 nm.

With reference toFIG. 8, in some optional embodiments, the encapsulation layer30further includes a fourth inorganic film layer36on the side of the third inorganic film layer35away from the second auxiliary film layer34. The fourth inorganic film layer36having a refractive index greater than the refractive index of the third inorganic film layer35. The display panel100further includes a touch layer40on the side of the encapsulation layer30away from the light-emitting element20. The touch layer40includes a fifth inorganic film layer41, a metal layer and an optical adhesive layer47that are stacked sequentially on the side of the encapsulation layer30away from the light-emitting element20. The refractive index of the fourth inorganic film layer36is less than the refractive index of the fifth inorganic film layer41.

In these embodiments, the fourth inorganic film layer36is arranged between the third inorganic film layer35and the fifth inorganic film layer41. The refractive index of fourth inorganic film layer36is between the refractive index of the third inorganic film layer35and the refractive index of the fifth inorganic film layer41. The refractive index of the fourth inorganic film layer36is closer to the refractive index of the third inorganic film layer35than the refractive index of the fifth inorganic film layer41, so that the light transmittance of the display panel100can be increased and the power consumption of the display panel100can be improved. In addition, the light reflected by the contact interface between the third inorganic film layer35and the fourth inorganic film layer36and the light reflected by the contact interface between the fourth inorganic film layer36and the fifth inorganic film layer41may interfere with each other, so that the color shift between viewing angles or uneven color rendering of the display panel100due to the uneven thickness of the third inorganic film layer35can be mitigated, the color shift of the display panel100can be reduced and the display effect of the display panel100can be improved.

Optionally, at least a part of the combined structure layer is in the encapsulation layer30, another part of the combined structure layer is in the touch layer40, and the first structure layer is the third inorganic film layer35. The second structure layer is the fourth inorganic film layer36, and the third structure layer is the fifth inorganic film layer41. That is, the refractive indices of the third inorganic film layer35, the fourth inorganic film layer36and the fifth inorganic film layer41satisfy the following equation:

where nw4is the refractive index of the fourth inorganic film layer36, nw3is the refractive index of the third inorganic film layer35, and nw5is the refractive index of the fifth inorganic film layer41.

When the refractive indices of the third inorganic film layer35, the fourth inorganic film layer36and the fifth inorganic film layer41satisfy the above-mentioned relationship, the light transmittance of the third inorganic film layer35, the fourth inorganic film layer36and the fifth inorganic film layer41can be effectively increased, the light transmittance of the display panel100can be further increased, and the power consumption of the display panel100can be improved.

Optionally, with reference toFIG. 8, there may be two combined structure layers. One of the combined structure layers can be provided in the encapsulation layer. That is, in one of the combined structure layers, the first structure layer is the organic film layer33, the second structure layer is the second inorganic film layer34, and the third structure layer is the third inorganic film layer35. That is, the refractive indices of the organic film layer33, the second inorganic film layer34and the third inorganic film layer35satisfy the above-mentioned equation (2).

At least a part of the other combined structure layer is positioned in the encapsulation layer30, and another part of another combined structure layer is positioned in the touch layer40. That is, in the another combined structure layer, the first structure layer is the third inorganic film layer35, the second structure layer is the fourth inorganic film layer36, and the third structure layer is the fifth inorganic film layer41. That is, the relationship between the refractive indices of the third inorganic film layer35, the fourth inorganic film layer36and the fifth inorganic film layer41satisfies the above-mentioned equation (3).

In some embodiments, the fourth inorganic film layer36has a refractive index ranging from 1.80 to 1.90. Optionally, the fourth inorganic film layer36has a refractive index of 1.84. For example, the third inorganic film layer35has a refractive index of 1.78 and the fifth inorganic film layer41has a refractive index of 1.9, then the fourth inorganic film layer36may have a refractive index of 1.84.

In some optional embodiments, the fourth inorganic film layer36has a thickness ranging from 80 nm to 100 nm. Optionally, the fourth inorganic film layer36has a thickness of 90 nm.

In some embodiments, the metal layer includes a first metal layer42and a second metal layer45. A sixth inorganic film layer43is provided between the first metal layer42and the second metal layer45. An optimization layer is provided between the sixth inorganic film layer43and the optical adhesive layer47. A refractive index of the optimization layer is less than the refractive index of the sixth inorganic film layer43and greater than the refractive index of the optical adhesive layer47.

In these embodiments, an optimization layer having a refractive index less than that of the sixth inorganic film layer43and greater than that of the optical adhesive layer47is provided between the sixth inorganic film layer43and the optical adhesive layer47. By providing the optimization layer, the angle of the touch layer40where total reflection occurs can be increased, the amount of light in which total reflection occurs can be reduced, thereby increasing the light output and improving the power consumption of the display panel100.

There may be one optimization layer, which is disposed between the sixth inorganic film layer43and the second metal layer45or disposed between the second metal layer45and the optical adhesive layer47.

In other embodiments, the optimization layers include a first optimization layer44positioned between the sixth inorganic film layer43and the second metal layer45and a second optimization layer46positioned between the second metal layer45and the optical adhesive layer47, the first optimization layer44having a refractive index greater than the refractive index of the second optimization layer46.

In these embodiments, the optimization layers include a first optimization layer44and a second optimization layer46. The refractive indices of the sixth inorganic film layer43, the first optimization layer44, the second optimization layer46and the optical adhesive layer47decrease in the direction from the sixth inorganic film layer43to the optical adhesive layer47, so that the angle of total reflection can be further increased, the amount of total reflection light can be reduced, the light output of the display panel100can be increased and the power consumption of the display panel100can be improved.

Optionally, the combined structure layer is provided in the touch layer40. The first structure layer is the sixth inorganic film layer43, the second structure layer is the second optimization layer46, and the third structure layer is the optical adhesive layer47. That is, the refractive indices of the sixth inorganic film layer43, the second optimization layer46and the optical adhesive layer47satisfy the following equation:

where ny2is the refractive index of the second optimization layer46, n6is the refractive index of the sixth inorganic film layer43, and nois the refractive index of the optical adhesive layer47.

When the refractive indices of the sixth inorganic film layer43, the second optimization layer46and the optical adhesive layer47satisfy the above-mentioned relationship, the light transmittance of the sixth inorganic film layer43, the second optimization layer46and the optical adhesive layer47can be effectively increased, the light transmittance of the display panel100can be further increased, and the power consumption of the display panel100can be improved.

Optionally, the combined structure layer is provided in the touch layer40. The first structure layer is the sixth inorganic film layer43, the second structure layer is the first optimization layer44, and the third structure layer is the second optimization layer46. That is, the refractive indexes of the sixth inorganic film layer43, the first optimization layer44and the second optimization layer46satisfy the following equation:

where ny1is the refractive index of the first optimization layer44, ny2is the refractive index of the second optimization layer46, and n6is the refractive index of the sixth inorganic film layer43.

When the refractive indices of the sixth inorganic film layer43, the first optimization layer44and the second optimization layer46satisfy the above-mentioned relationship, the light transmittance of the sixth inorganic film layer43, the first optimization layer44and the second optimization layer46can be effectively increased, the light transmittance of the display panel100can be further increased, and the power consumption of the display panel100can be improved.

Optionally, there are two combined structure layers. One of the combined structure layers is provided in the touch layer40, where the first structure layer is the sixth inorganic film layer43, the second structure layer is the second optimization layer46, and the third structure layer is the optical adhesive layer47. That is, the refractive indexes of the sixth inorganic film layer43, the second optimization layer46and the optical adhesive layer47satisfy the above-mentioned relationship (4).

Another combined structure layer is provided in the touch layer40, where the first structure layer is the sixth inorganic film layer43, the second structure layer is the first optimization layer44, and the third structure layer is the second optimization layer46. That is, the refractive indices of the sixth inorganic film layer43, the first optimization layer44and the second optimization layer46satisfy the above-mentioned relationship (5).

In some embodiments, there are a plurality of combined structure layers, where one of the combined structure layers may be provided in the encapsulation layer, namely, where the first structure layer in one combined structure layer is the organic film layer33, the second structure layer is the second inorganic film layer34, and the third structure layer is the third inorganic film layer35. That is, the refractive indices of the organic film layer33, the second inorganic film layer34and the third inorganic film layer35satisfy the above-mentioned formula (2).

At least part of another combined structure layer is positioned in the encapsulation layer30, another part of the another combined structure layer is positioned on the touch layer40. In the another combined structure layer, the first structure layer is the third inorganic film layer35, the second structure layer is the fourth inorganic film layer36, and the third structure layer is the fifth inorganic film layer41. That is, the refractive index relationship between the third inorganic film layer35, the fourth inorganic film layer36and the fifth inorganic film layer41satisfy the above-mentioned equation (3).

A further combined structure layer is provided in the touch layer40, where the first structure layer is the sixth inorganic film layer43, the second structure layer is the second optimization layer46, and the third structure layer is the optical adhesive layer47. That is, the refractive indexes of the sixth inorganic film layer43, the second optimization layer46and the optical adhesive layer47satisfy the above-mentioned equation (4).

A yet further combined structure layer is provided in the touch layer40, where the first structure layer is the sixth inorganic film layer43, the second structure layer is the first optimization layer44, and the third structure layer is the second optimization layer46. That is, the refractive indices of the sixth inorganic film layer43, the first optimization layer44and the second optimization layer46satisfy the above-mentioned equation (5).

In some embodiments, the refractive index of the second optimization layer46ranges from 1.65 to 1.75. Optionally, the refractive index of the second optimization layer46is 1.69. Optionally, the refractive index of the first optimization layer44ranges from 1.75 to 1.85. Optionally, the refractive index of the first optimization layer44is 1.79. For example, if the refractive index of the sixth inorganic film layer43is 1.9 and the refractive index of the optical adhesive layer47is 1.5, then the refractive index of the second optimization layer46may be 1.69 and the refractive index of the first optimization layer44may be 1.79.

The fifth inorganic film layer41and the sixth inorganic film layer43are, for example, silicon-nitride layers. The first optimization layer44and the second optimization layer46are, for example, inorganic material layers, so that the first optimization layer44and the second optimization layer46can be formed by a same process as the sixth inorganic film layer43. For example, the sixth inorganic film layer43is formed by chemical deposition, the first optimization layer44is an inorganic material layer, and the first optimization layer44can also be formed by chemical deposition. In the forming process of the display panel100, after the formation of the sixth inorganic film layer43is completed, the first optimization layer44can be formed by changing the parameters of the chemical deposition without moving the chemical deposition apparatus. Therefore, the forming process of the display panel100can be simplified and the forming efficiency of the display panel100can be improved.

In some embodiments, when the refractive indices of the fifth inorganic film layer41and the sixth inorganic film layer43are different, a third optimization layer may be provided between the fifth inorganic film layer41and the sixth inorganic film layer43. The refractive index of the third optimization layer is between those of the fifth inorganic film layer41and the sixth inorganic film layer43, so that the power consumption of the display panel100can be further improved and the display effect of the display panel100can be improved.

In some embodiments, a cover plate is provided on optical adhesive layer47, for example.

In some embodiments, the first optimization layer44has a thickness, for example, ranging from 80 nm to 100 nm, for example, the first optimization layer44has a thickness of 90 nm.

In some optional embodiments, the second optimization layer46has a thickness, for example, ranging from 80 nm to 100 nm, for example, the second optimization layer46has a thickness of 90 nm.

The embodiments of the present application further provide a display apparatus that may include the display panel100according to any of the embodiments described above. Since the display apparatus according to the embodiments of the present application includes the above-described display panel100, the display apparatus according to the embodiments of the present application has the advantageous effects of the above-described display panel100, and will not be described in detail herein.

As with the embodiments described herein, these embodiments are not intended to be exhaustive or to limit the application to only the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. This application is limited only by the claims and the full scope and equivalents thereof.