Patent Description:
The concept of full-screen mobile phone using organic light emitting diodes has been attracted wide attention in the mobile phone market, and it is also the development trend in the future. In the full-screen mobile phone, a functional component, such as a camera, etc., can be hidden, so that the front visible area is almost all the screen, and therefore, the user can get a better display effect. <CIT> discloses an active device array substrate. <CIT> discloses a display panel and a display device.

It is an object of the present invention to provide a display panel and a display device. The object is achieved by the features of the respective independent claims. Further embodiments are defined in the corresponding dependent claims.

In order to clearly illustrate the technical solutions of the embodiments of the disclosure, the drawings of the embodiments will be briefly described in the following; it is obvious that the described drawings are only related to some embodiments of the disclosure and thus are not limitative to the disclosure.

Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms "first," "second," etc., which are used in the description and the claims of the present disclosure, are not intended to indicate any sequence, amount or importance, but distinguish various components. Also, the terms "comprise," "comprising," "comprise," "comprising," etc., are intended to specify that the elements or the objects stated before these terms encompass the elements or the objects and equivalents thereof listed after these terms, but do not preclude the other elements or objects.

The base substrate of an organic light emitting diode display panel includes a multi-layer structure. For example, the multi-layer structure can include an organic layer, an amorphous silicon layer and an inorganic layer which are sequentially stacked. The camera is located at a side opposite to a light emitting side of the organic light emitting diode display panel, that is, the organic light emitting diode display panel includes an organic light emitting element, and the camera is located at one side of the base substrate away from the organic light emitting element. Therefore, the ambient light passes through the base substrate and then enters the camera arranged in the mobile phone.

<FIG> is a schematic diagram showing the influence of an amorphous silicon layer in a base substrate on light transmittance. As shown in <FIG>, compared with the case where the amorphous silicon layer is included in the base substrate, the transmittance of blue light is significantly improved after the amorphous silicon layer in the base substrate is removed. In the schematic diagram shown in <FIG>, the abscissa is wavelength, and the ordinate is transmittance. The transmittance of blue light within the wavelength range from <NUM> to <NUM> can be increased by about <NUM>%, while the overall transmittance of the base substrate in the visible band can be increased by about <NUM>% to <NUM>%. In research, the inventors of the present application have observed that: in the case where the amorphous silicon layer of the organic light emitting diode display panel is thick, for example, the thickness thereof is greater than <NUM> nanometers, the amorphous silicon layer with larger thickness will weaken the blue light in the external ambient light incident thereon, which results in that the light received by the camera is uneven, and further in that the light received by the camera is yellowish.

The embodiments of the present disclosure provide a display panel and a display device. The display panel includes a base substrate, and the base substrate includes a display region and a peripheral region surrounding the display region. The base substrate includes a first substrate layer, a third substrate layer and a second substrate layer which are sequentially stacked, and the material of the second substrate layer includes amorphous silicon. The display region includes a transparent display region, the transparent display region includes a pixel region and a light transmission region, and a thickness of the second substrate layer located in the light transmission region is less than a thickness of at least part of the second substrate layer located outside the transparent display region. In the embodiment of the present disclosure, the transmittance of blue light passing through the transparent display region can be improved by setting the thickness of the second substrate layer at the position of the light transmission region to be less than the thickness of the second substrate layer outside the transparent display region.

Hereinafter, the display panel and the display device provided by the embodiments of the present disclosure will be described with reference to the accompanying drawings.

<FIG> is a partial planar structural view of a display panel according to an embodiment of the present disclosure, and <FIG> is a partial cross-sectional structural view taken along line AA shown in <FIG> in an example of an embodiment of the present disclosure. As shown in <FIG>, the display panel includes a base substrate <NUM>, and the base substrate <NUM> includes a display region <NUM> and a peripheral region <NUM> surrounding the display region <NUM>. For example, the display region <NUM> is a region for displaying a picture, that is, a light emitting region; and the peripheral region <NUM> is a region not for displaying a picture, that is, a non-light emitting region.

As shown in <FIG>, the base substrate <NUM> includes a first substrate layer <NUM>, a second substrate layer <NUM> and a third substrate layer <NUM> which are sequentially stacked, and the material of the second substrate layer <NUM> includes amorphous silicon. As shown in <FIG>, the display region <NUM> includes a transparent display region <NUM>, the transparent display region <NUM> includes a pixel region <NUM> and a light transmission region <NUM>, and a thickness of the second substrate layer <NUM> located in the light transmission region <NUM> is less than a thickness of at least part of the second substrate layer <NUM> located outside the transparent display region <NUM>. In the embodiment of the present disclosure, the transmittance of blue light in the second substrate layer located in the light transmission region can be improved by setting the thickness of the second substrate layer located in the light transmission region to be less than the thickness of the second substrate layer located outside the transparent display region. It should be noted that the thickness of the second substrate layer located in the light transmission region can be zero. That is, the second substrate layer may not be disposed in the light transmission region. For example, the thickness of the second substrate layer in the whole transparent display region is less than the thickness of the second substrate layer outside the transparent display region, or the second substrate layer in the transparent display region is patterned to make the second substrate layer in the light transmission region thinner (including thinned to zero).

<FIG> is a partial cross-sectional structural view taken along line AA shown in <FIG> in another example of an embodiment of the present disclosure. The example shown in <FIG> is different from the example shown in <FIG> in that: in the example shown in <FIG>, the second substrate layer <NUM> is located between the first substrate layer <NUM> and the third substrate layer <NUM>; and in the example shown in <FIG>, the second substrate layer <NUM> is located at one side of the third substrate layer <NUM> away from the first substrate layer <NUM>. The following embodiments are described by taking that the second substrate layer <NUM> is located at one side of the third substrate layer <NUM> away from the first substrate layer <NUM> as an example.

For example, as shown in <FIG>, the display panel further includes a plurality of pixel units <NUM> located in the display region <NUM> of the base substrate <NUM>. The display region <NUM> includes a first pixel density region <NUM> and a second pixel density region <NUM>, and the pixel density (Pixels Per Inch, PPI) of the plurality of pixel units <NUM> located in the first pixel density region <NUM> is greater than the pixel density of the plurality of pixel units <NUM> located in the second pixel density region <NUM>, that is, the first pixel density region <NUM> can be a high pixel density region and the second pixel density region <NUM> can be a low pixel density region. The transparent display region <NUM> is located in the second pixel density region <NUM>, that is, the transparent display region <NUM> is a part of the low pixel density region.

For example, the first pixel density region <NUM> can also be referred to as a normal pixel region, the second pixel density region <NUM> can also be referred to as an abnormal pixel region, the light emitting area of pixel units in the second pixel density region <NUM> can be <NUM>/<NUM> of the light emitting area of pixel units in the first pixel density region <NUM>, and the PPI of pixel units in the second pixel density region <NUM> can be <NUM>/<NUM> of the PPI of pixel units in the first pixel density region <NUM>.

In the case where the camera is located at the non-display side of the display panel, the camera performs imaging by acquiring external light signals passing through the transparent display region. In the embodiment of the disclosure, the PPI of the transparent display region is designed to be lower than the PPI of the first pixel density region, so that the light transmittance of the transparent display region can be increased while taking account of display, so as to realize the photographing function.

For example, as shown in <FIG>, the area of the first pixel density region <NUM> is larger than the area of the second pixel density region <NUM>, so as to realize normal display.

For example, as shown in <FIG>, the combined shape of the first pixel density region <NUM> and the second pixel density region <NUM> can be rectangular, that is, the shape of the display region <NUM> can be rectangular. For example, the shape of the display region <NUM> can be a regular shape, such as a rectangle or a circle, etc., or an irregular shape. For example, the shape of the second pixel density region <NUM> can be a regular shape, such as a rectangle or a circle, etc., or an irregular shape. For example, the shape of the transparent display region <NUM> can be a regular shape, such as a rectangle or a circle, etc., or an irregular shape, which is not limited in the embodiments of the present disclosure.

For example, the first pixel density region <NUM> can surround the second pixel density region <NUM>, or the second pixel density region <NUM> can also be located at one side edge of the first pixel density region <NUM>. The embodiment of the present disclosure does not limit the positional relationship between the first pixel density region and the second pixel density region.

<FIG> is a partial cross-sectional structural view of a pixel unit outside a transparent display region in a display panel according to an embodiment of the present disclosure. As shown in <FIG> and <FIG>, each pixel unit <NUM> located outside the transparent display region <NUM> can include a plurality of sub-pixels, and each sub-pixel includes an organic light emitting element and a pixel circuit electrically connected with the organic light emitting element. The organic light emitting element includes an organic light emitting layer <NUM>, and a first electrode <NUM> and a second electrode <NUM> which are located at both sides of the organic light emitting layer <NUM>. And the organic light emitting layer <NUM> can be driven to emit light by applying an electrical signal to the first electrode <NUM> and the second electrode <NUM>.

For example, the embodiment of the present disclosure takes that the second electrode <NUM> is an independent electrode of each sub-pixel, and the first electrode <NUM> is a common electrode shared by respective sub-pixels as an example, but is not limited thereto.

For example, the pixel unit <NUM> can include sub-pixels of different colors, such as a red sub-pixel, a green sub-pixel and a blue sub-pixel, which are not limited in the embodiment of the present disclosure and can be set according to actual product demands.

For example, as shown in <FIG>, the display panel includes a pixel defining layer <NUM>, and the pixel defining layer <NUM> includes a plurality of openings to define light emitting regions of the sub-pixels.

For example, as shown in <FIG>, each pixel unit <NUM> further includes a thin film transistor <NUM> electrically connected with the second electrode <NUM>, and the thin film transistor <NUM> is located at one side of the second substrate layer <NUM> away from the third substrate layer <NUM>. <FIG> illustratively shows that the second substrate layer <NUM> is a patterned structure (including a first pattern <NUM>), which is not limited thereto. And the second substrate layer <NUM> can also be an integral layer or a film layer only located outside the transparent display region.

For example, as shown in <FIG>, the thin film transistor <NUM> includes an active layer <NUM>, and the material of the active layer <NUM> includes amorphous silicon. The thin film transistor <NUM> further includes a source electrode <NUM> and a drain electrode <NUM>, and one of the source electrode <NUM> and the drain electrode <NUM> is electrically connected with the second electrode <NUM>.

For example, as shown in <FIG>, the second electrode <NUM> is electrically connected with one of the source electrode <NUM> and the drain electrode <NUM> through a via hole in the passivation layer <NUM> and the planarization layer <NUM> which are between the second electrode <NUM> and the source/drain electrode.

<FIG> only illustratively shows a thin film transistor electrically connected with the second electrode, and the thin film transistor can be a light emitting control transistor in a pixel circuit included in the display panel. For example, the pixel circuit in the embodiment of the present disclosure can include a 7T1C (i.e., seven transistors and one capacitor) structure, but is not limited thereto, and the pixel circuit can also include a 7T2C structure, a 6T1C structure, a 6T2C structure, or a 9T2C structure, etc..

For example, in the case where the pixel circuit includes a 7T1C structure, the pixel circuit can include a driving transistor T1, a data writing transistor T2, a threshold compensation transistor T3, a first light emitting control transistor T4, a second light emitting control transistor T5, a first reset transistor T6 and a second reset transistor T7. The thin film transistor shown in <FIG> can be the second light emitting control transistor electrically connected with the driving transistor and the second electrode of the organiclight emitting element, and configured to turn on or off the connection between the driving transistor and the organic light emitting element; a control end of the driving transistor is connected with a data line included in the display panel, and a first end or a second end of the driving transistor is electrically connected with the second electrode of the organic light emitting element, so as to provide a driving current for driving the organic light emitting element to emit light. The pixel unit shown in <FIG> includes a pixel circuit, but the pixel unit located in the transparent display region differs from the pixel unit shown in <FIG> in that the pixel unit in the transparent display region does not include a pixel circuit.

For example, as shown in <FIG>, a region outside the transparent display region <NUM> includes the first pixel density region <NUM> and a region of the second pixel density region <NUM> other than the transparent display region <NUM>. For example, the second pixel density region <NUM> further includes a transition region <NUM> located at the periphery of the transparent display region <NUM>. The embodiment of the present disclosure takes that the region of the second pixel density region <NUM> other than the transparent display region <NUM> is the transition region <NUM> as an example, but is not limited thereto, and the second pixel density region can further include other regions.

For example, the pixel units <NUM> located in the transition region <NUM> and the pixel units <NUM> located in the first pixel density region <NUM> include an organic light emitting element and a pixel circuit, and the PPI of the pixel units <NUM> located in the transition region <NUM> is lower than the PPI of the pixel units located in the first pixel density region <NUM>.

For example, the pixel unit <NUM> located in the transparent display region <NUM> only includes an organic light emitting element, and does not include a pixel circuit. For example, each pixel unit <NUM> located in the transparent display region <NUM> includes an organic light emitting layer <NUM>, a first electrode <NUM>, and a second electrode <NUM>. For example, the second electrode <NUM> included in the organic light emitting element is only located in the pixel region <NUM>, but not in the light transmission region <NUM>. Only the organic light emitting element is disposed in the pixel region <NUM>, and no pixel circuit is disposed in the pixel region <NUM>. For example, the pixel unit located in the transparent display region only includes an organic light emitting element, thus better ensuring the light transmittance at the position of the camera and achieving a better photographing effect.

For example, the pixel circuit electrically connected with the organic light emitting element in the transparent display region <NUM> is not disposed in the transparent display region <NUM>, but is disposed in a region outside the transparent display region <NUM>, for example, in the transition region <NUM>. For example, the wire connected with the organic light emitting element in the transparent display region <NUM> can be made of a transparent conductive material, so as to ensure the transmission of signals and have a relatively high light transmittance.

For example, as shown in <FIG>, the second substrate layer <NUM> located in the transparent display region <NUM> includes a first pattern <NUM>, and the orthographic projection of the first pattern <NUM> on the first substrate layer <NUM> coincides with the orthographic projection of the second electrode <NUM> on the first substrate layer <NUM>, that is, the first pattern <NUM> is located in the pixel region <NUM>. That is to say, the second substrate layer <NUM> can be patterned with the same mask plate as the second electrode <NUM> in the organic light emitting element, so as to save the mask plate process. For example, the first substrate layer <NUM> and the third substrate layer <NUM> in the embodiment of the present disclosure are continuous integral layers so that the base substrate is a continuous layer. The coincidence of the orthographic projections of the first pattern and the second electrode on the first substrate layer can include a complete coincidence or approximate coincidence of the orthographic projections, and the approximate coincidence of the orthographic projections of the first pattern and the second electrode means that the coincidence rate of the orthographic projections is greater than <NUM>%.

For example, as shown in <FIG>, the display panel further includes a first buffer layer <NUM>, a second buffer layer <NUM>, and a first gate insulating layer <NUM> sequentially located on the fourth substrate layer <NUM>. The first gate insulating layer <NUM> covers the active layer <NUM>, a first gate layer <NUM> is disposed on the first gate insulating layer <NUM>, a second gate insulating layer <NUM> is disposed on the first gate layer <NUM>, a second gate layer <NUM> is disposed on the second gate insulating layer <NUM>, an interlayer insulating layer <NUM> is disposed on the second gate layer <NUM>, the source and drain electrodes <NUM> and <NUM> are disposed on the interlayer insulating layer <NUM>, and the source and drain electrodes <NUM> and <NUM> are electrically connected with the active layer <NUM> through via holes in the interlayer insulating layer <NUM> and the second gate insulating layer <NUM>. A first inorganic encapsulation layer <NUM>, an organic encapsulation layer <NUM> and a second inorganic encapsulation layer <NUM> are sequentially arranged at one side of the first electrode <NUM> away from the first substrate layer <NUM>.

For example, <FIG> is a schematic diagram of a light emitting region of one pixel in a pixel unit located in a second pixel density region according to an embodiment of the present disclosure; and <FIG> is a schematic diagram of a light emitting region of one pixel in a pixel unit located in a first pixel density region according to an embodiment of the present disclosure. As shown in <FIG> and <FIG>, the area of the light emitting region <NUM> of the sub-pixel <NUM> included in the pixel unit in the second pixel density region is greater than the area of the light emitting region <NUM> of the sub-pixel <NUM> included in the pixel unit in the first pixel density region.

For example, the area of the opening of the pixel defining layer in the first pixel density region can be set less than the area of the opening of the pixel defining layer in the second pixel density region, so that the light emitting region of the sub-pixel <NUM> in the second pixel density region has a larger area than the light emitting region of the sub-pixel in the first pixel density region.

For example, the area of the second electrode of the sub-pixel in the first pixel density region can be set less than the area of the second electrode of the sub-pixel in the second pixel density region, so that the area of the light emitting region of the sub-pixel in the second pixel density region is greater than the area of the light emitting region of the sub-pixel in the first pixel density region. In this case, compared with the case where the area of the second electrode of the sub-pixel in the first pixel density region is equal to the area of the second electrode of the sub-pixel in the second pixel density region, the area of the first pattern of the second substrate layer becomes larger, and the area of the opening located in the light transmission region correspondingly decreases.

<FIG> is a schematic plan view of a second substrate layer in a transparent display region of a display panel shown in <FIG>. As shown in <FIG>, the sub-pixels included in the pixel units are arranged in a GGRB pixel arrangement structure as an example, that is, one pixel group includes two green sub-pixels, one red sub-pixel and one blue sub-pixel. The four second electrodes included in the four sub-pixels in the same pixel group are separated from each other, and there is a certain spacing between adjacent pixel groups. The embodiments of the present disclosure is not limited thereto, and the plurality of sub-pixels included in the display panel can be arranged in various pixel arrangements.

For example, as shown in <FIG>, the second substrate layer <NUM> located in the transparent display region <NUM> further includes an opening <NUM>, and the orthographic projection of the opening <NUM> on the first substrate layer <NUM> is not overlapped with the orthographic projection of the second electrode <NUM> on the first substrate layer <NUM>, that is, the opening <NUM> is located in the light transmission region <NUM>. That is to say, the second substrate layer <NUM> located in the transparent display region <NUM> can include a first pattern <NUM> and an opening <NUM>, the first pattern <NUM> is located in the pixel region, and the opening <NUM> is located in the light transmission region. For example, the orthographic projection of the opening <NUM> on the first substrate layer <NUM> can coincide with the orthographic projection of the spacing between the second electrodes <NUM> on the first substrate layer <NUM>. For example, the planar shapes of the first pattern <NUM> and the opening <NUM> can be complementary shapes.

In an embodiment of the present disclosure, the second substrate layer located in the transparent display region includes a first pattern and an opening, so the second substrate layer located in the transparent display region can include two different thicknesses, namely, the thickness at the position of the first pattern and the thickness at the position of the opening. The thickness of the second substrate layer at the position of the opening is <NUM>, so the thickness of the second substrate layer at the position of the opening is less than the thickness of at least part of the second substrate layer outside the transparent display region.

For example, as shown in <FIG>, the thickness of the first pattern <NUM> can be the same as the thickness of at least part of the second substrate layer <NUM> located outside the transparent display region <NUM>. For example, the thickness of the second substrate layer <NUM> located outside the transparent display region <NUM> can be the same as the thickness of the amorphous silicon layer included in the base substrate of a common display panel, which is, for example, greater than <NUM> nanometers, and the thickness of the first pattern <NUM> is the same as the thickness of the second substrate layer <NUM> located outside the transparent display region <NUM>, so as to save a mask plate. The embodiment of the present disclosure is not limited thereto, and the thickness of the first pattern can also be less than the thickness of at least part of the second substrate layer located outside the transparent display region, thereby further improving the transmittance of blue light in the transparent display region.

In the embodiment of the present disclosure, the transmittance of blue light passing through the base substrate in the transparent display region can be improved by patterning the second substrate layer in the transparent display region to form an opening.

For example, as shown in <FIG>, the second substrate layer <NUM> located in the transition region <NUM> includes a second pattern <NUM>, and the orthographic projection of the second pattern <NUM> on the first substrate layer <NUM> coincides with the orthographic projection of the second electrode <NUM> on the first substrate layer <NUM>.

For example, the second substrate layer <NUM> located in the transition region <NUM> further includes an opening pattern (not labeled), and the orthographic projection of the opening pattern on the first substrate layer <NUM> is not overlapped with the orthographic projection of the second electrode <NUM> on the first substrate layer <NUM>.

For example, the first pattern <NUM> can include a plurality of first sub-patterns, and each first sub-pattern can be the same as the pattern of the second electrode included in each pixel group located in the transparent display region <NUM>. The second pattern <NUM> can also include a plurality of second sub-patterns, and each second sub-pattern can be the same as the pattern of the second electrode included in each pixel unit located in the transition region <NUM>.

For example, the planar shape of the first sub-pattern is the same as the planar shape of the second sub-pattern, and the size of the first sub-pattern is the same as the size of the second sub-pattern.

For example, the first pattern <NUM> and the second pattern <NUM> can be patterns formed by patterning in the same process with using the same mask plate.

The PPI of pixel units located in the second pixel density region is even, so the PPI of pixel units located in the transparent display region and the PPI of pixel units located in the transition region are equal. Therefore, a mask region for patterning to form the second electrode in the transparent display region and a mask region for patterning to form the second electrode in the transition region are two regions of the same mask plate. That is, one mask plate is used to simultaneously form the second electrodes of the organic light emitting elements located in the transparent display region and the transition region, and the mask region for forming the second electrode of the transparent display region is a part of the mask plate. While patterning to form the first pattern of the second electrode in the transparent display region by using a mask plate, the second pattern can be formed, so as to save the process.

For example, the material of the first substrate layer <NUM> can include an organic material, such as polyimide, etc., and the material of the third substrate layer <NUM> can include an inorganic material, such as silicon oxide or silicon nitride, etc..

For example, as shown in <FIG>, the base substrate <NUM> further includes a fourth substrate layer <NUM> located at one side of the second substrate layer <NUM> away from the third substrate layer <NUM>, and the material of the fourth substrate layer <NUM> includes polyimide. In the embodiment of the present disclosure, the interface adhesion effect between the fourth substrate layer and the third substrate layer can be improved by arranging the second substrate layer made of amorphous silicon between the fourth substrate layer and the third substrate layer.

For example, the thickness of the fourth substrate layer <NUM> is in a micron level, and the thickness of the second substrate layer <NUM> is in a nanometer level, for example, not more than <NUM> nanometers. Therefore, even if the second substrate layer <NUM> located in the transparent display region <NUM> is patterned to form an opening <NUM>, the side of the base substrate <NUM> facing the organic light emitting element will not be uneven.

For example, the thin film transistor <NUM> can be located at one side of the fourth substrate layer <NUM> away from the second substrate layer <NUM>.

For example, <FIG> is a partial cross-sectional structural view of a display panel according to another embodiment of the present disclosure. <FIG> can be a partial cross-sectional structural view taken along line AA shown in <FIG>. As shown in <FIG>, the present embodiment differs from the embodiment shown in <FIG> in that: the second substrate layer <NUM> is not disposed in the transparent display region <NUM> in the present embodiment, that is, the thickness of the second substrate layer <NUM> in the transparent display region <NUM> is <NUM>.

In the embodiment of the present disclosure, by removing the second substrate layer of the base substrate in the transparent display region, that is, a second substrate layer is not disposed in the transparent display region, the transmittance of blue light in the transparent display region can be increased, and the purpose of improving the photographing effect of the camera can be achieved.

For example, as shown in <FIG> and <FIG>, in the display region <NUM>, the thickness of the second substrate layer <NUM> located at each position other than the transparent display region <NUM> is even to ensure a good adhesion effect between the fourth substrate layer <NUM> and the third substrate layer <NUM>.

For example, as shown in <FIG> and <FIG>, the thickness of the second substrate layer <NUM> located outside the transparent display region <NUM> is even to ensure a good adhesion effect between the fourth substrate layer <NUM> and the third substrate layer <NUM>. That is, the thickness of the second substrate layer <NUM> located in the display region <NUM> other than the transparent display region <NUM> and the thickness of the second substrate layer <NUM> located in the peripheral region <NUM> are equal to facilitate manufacturing.

For example, as shown in <FIG> and <FIG>, the thickness of the second substrate layer <NUM> located outside the transparent display region <NUM> can be greater than <NUM> microns.

For example, the thickness of the second substrate layer in the peripheral region can be greater than the thickness of the second substrate layer in the display region.

The characteristics, such as material, shape and thickness, etc., of the first substrate layer <NUM>, the third substrate layer <NUM> and the fourth substrate layer <NUM> included in the base substrate in the embodiment shown in <FIG> are the same as those of the three film layers included in the embodiment shown in <FIG>, and details will not be repeated here.

The characteristics, such as structure, arrangement, and positional relationship with the transparent display region, of the pixel unit in the embodiment shown in <FIG> are the same as those of the pixel unit in the embodiment shown in <FIG>, and details will not be repeated here.

For example, <FIG> is a partial cross-sectional structural view of a display panel according to another embodiment of the present disclosure. <FIG> can be a partial cross-sectional structural view taken along line AA shown in <FIG>. As shown in <FIG>, the present embodiment differs from the embodiment shown in <FIG> in that: in the present embodiment, the thickness of the second substrate layer <NUM> located at each position in the transparent display region <NUM> is even, and the thickness of the second substrate layer <NUM> in the transparent display region <NUM> is less than the thickness of at least part of the second substrate layer <NUM> located outside the transparent display region <NUM>.

For example, the thickness of the second substrate layer <NUM> located in the transparent display region <NUM> is in the range from <NUM> to <NUM>, and the thickness of at least part of the second substrate layer <NUM> located outside the transparent display region <NUM> is greater than <NUM>.

For example, the thickness of the second substrate layer <NUM> located in the transparent display region <NUM> is in the range from <NUM> to <NUM>.

In the embodiment of the present disclosure, by thinning the thickness of the second substrate layer of the base substrate in the transparent display region, the transmittance of blue light in the transparent display region can be increased, and the purpose of improving the photographing effect of the camera can be achieved.

For example, as shown in <FIG>, in the display region <NUM>, the thickness of the second substrate layer <NUM> located at each position other than the transparent display region <NUM> is even to ensure a good adhesion effect between the fourth substrate layer <NUM> and the third substrate layer <NUM>.

For example, as shown in <FIG>, the thickness of the second substrate layer <NUM> located outside the transparent display region <NUM> is even to ensure a good adhesion effect between the fourth substrate layer <NUM> and the third substrate layer <NUM>. That is, the thickness of the second substrate layer <NUM> located in the display region <NUM> other than the transparent display region <NUM> and the thickness of the second substrate layer <NUM> located in the peripheral region <NUM> are equal to facilitate manufacturing.

For example, <FIG> is a partial cross-sectional structural view of a display panel according to another embodiment of the present disclosure. <FIG> can be a partial cross-sectional structural view taken along line AA shown in <FIG>. As shown in <FIG>, the present embodiment differs from the embodiment shown in <FIG> in that: in the present embodiment, the thickness of the second substrate layer <NUM> located at each position in the display region <NUM> is even, and the thickness of the second substrate layer <NUM> in the peripheral region <NUM> is greater than the thickness of the second substrate layer <NUM> in the display region <NUM>.

For example, the thickness of the second substrate layer <NUM> in the display region <NUM> is in the range from <NUM> to <NUM>, and the thickness of the second substrate layer <NUM> in the peripheral region <NUM> is greater than <NUM>.

For example, the thickness of the second substrate layer <NUM> in the display region <NUM> is in the range from <NUM> to <NUM>.

In the embodiment of the present disclosure, by thinning the thickness of the second substrate layer of the base substrate in the display region, the transmittance of blue light in the transparent display region can be increased, and the purpose of improving the photographing effect of the camera can be achieved.

For example, as shown in <FIG>, the thickness of the second substrate layer <NUM> in the peripheral region <NUM> is even to ensure a good adhesion effect between the fourth substrate layer <NUM> and the third substrate layer <NUM>.

For example, <FIG> is a partial cross-sectional structural view of a display panel according to another embodiment of the present disclosure. <FIG> can be a partial cross-sectional structural view taken along line AA shown in <FIG>. As shown in <FIG>, the present embodiment differs from the embodiment shown in <FIG> in that: the second substrate layer <NUM> is not disposed in the display region <NUM> in the present embodiment, that is, the thickness of the second substrate layer <NUM> in the display region <NUM> is <NUM>.

In the embodiment of the present disclosure, by removing the second substrate layer of the base substrate in the display region, the transmittance of blue light in the transparent display region can be increased, and the purpose of improving the photographing effect of the camera can be achieved.

For example, as shown in <FIG> and <FIG>, the thickness of the second substrate layer <NUM> located in the peripheral region <NUM> is even to ensure a good adhesion effect between the fourth substrate layer <NUM> and the third substrate layer <NUM>.

For example, the thickness of the second substrate layer <NUM> located in the peripheral region <NUM> can be greater than <NUM> nanometers.

The transparent display region in the embodiments shown in <FIG> can be located in the second pixel density region <NUM> (i.e., a low pixel density region) shown in <FIG>, or can be located in the first pixel density region <NUM> (i.e., a high pixel density region) shown in <FIG>. The embodiments of the present disclosure takes that the transparent display region in the embodiments shown in <FIG> is located in the second pixel density region <NUM> shown in <FIG> as an example, so that the light transmittance of the transparent display region can be increased while taking account of display, so as to realize the photographing function.

For example, <FIG> is a partial cross-sectional structural view of a display panel according to another embodiment of the present disclosure. <FIG> is also a partial cross-sectional structural view taken along line AA shown in <FIG>. As shown in <FIG> and <FIG>, the display panel includes a base substrate <NUM>, and the base substrate <NUM> includes a display region <NUM> and a peripheral region <NUM> surrounding the display region <NUM>.

As shown in <FIG> and <FIG>, the base substrate <NUM> includes a first substrate layer <NUM>, a third substrate layer <NUM> and a second substrate layer <NUM> which are sequentially stacked, and the material of the second substrate layer <NUM> includes amorphous silicon. The thickness of the second substrate layer <NUM> located at each position in the display region <NUM> and the peripheral region <NUM> is even and not more than <NUM> nanometers. In the embodiment of the present disclosure, the transmittance of blue light in the transparent display region can be improved by setting the thickness of the second substrate layer in the base substrate to be relatively small.

For example, the thickness of the second substrate layer <NUM> can be in the range from <NUM> to <NUM>.

Compared with the case where the thickness of the second substrate layer in a common base substrate is greater than <NUM>, the thickness of the second substrate layer in the embodiment of the present disclosure is not greater than <NUM>, and by setting the thickness of the second substrate layer in the base substrate to be relatively small, the transmittance of blue light in the transparent display region can be improved.

In the embodiment of the present disclosure, a second substrate layer with a thinner thickness, such as <NUM>-<NUM>, can be directly formed by deposition, without being patterned, thus improving the transmittance of blue light in the transparent display region without increasing the process cost.

For example, as shown in <FIG> and <FIG>, the display panel further includes a plurality of pixel units <NUM> located in the display region <NUM> of the base substrate <NUM>. The display region <NUM> includes a first pixel density region <NUM> and a second pixel density region <NUM>, and the pixel density (Pixels Per Inch, PPI) of the plurality of pixel units <NUM> located in the first pixel density region <NUM> is greater than the pixel density of the plurality of pixel units <NUM> located in the second pixel density region <NUM>, that is, the first pixel density region <NUM> can be a high pixel density region and the second pixel density region <NUM> can be a low pixel density region. The transparent display region <NUM> is located in the second pixel density region <NUM>, that is, the transparent display region <NUM> is a part of the low pixel density region.

For example, as shown in <FIG>, a region outside the transparent display region <NUM> include the first pixel density region <NUM> and a region of the second pixel density region <NUM> other than the transparent display region <NUM>. For example, the second pixel density region <NUM> further includes a transition region <NUM> located at the periphery of the transparent display region <NUM>. The embodiment of the present disclosure takes that the region of the second pixel density region <NUM> other than the transparent display region <NUM> is the transition region <NUM> as an example, but is not limited thereto, and the second pixel density region can further include other regions.

The pixel unit included in the embodiment of the present disclosure can have the same characteristics as the pixel unit shown in <FIG>, and details will not be repeated here.

For example, the present disclosure provides a manufacturing method of the display panel shown in <FIG>. As shown in <FIG>, the manufacturing method includes:
S10: forming the first substrate layer <NUM>.

For example, the material of the first substrate layer <NUM> can include an organic material, such as polyimide, etc..

For example, the first substrate layer <NUM> can be a continuous integral layer.

S20: forming the third substrate layer <NUM> on the first substrate layer <NUM>.

For example, the third substrate layer <NUM> can be a continuous integral layer.

For example, the material of the third substrate layer <NUM> can include an inorganic material, such as silicon oxide or silicon nitride, etc..

S30: forming a second substrate material layer on one side of the third substrate layer <NUM> away from the first substrate layer <NUM>.

For example, the material of the second substrate material layer includes amorphous silicon.

S40: patterning the second substrate material layer located in the transparent display region <NUM> by using a mask plate to form the first pattern <NUM>, wherein the mask plate is a mask plate for forming the second electrode <NUM> in the transparent display region <NUM>.

For example, after the second substrate material layer is formed on the third substrate layer, the second substrate material layer can be etched by means of dry etching or wet etching. Because the material of the first substrate layer is an organic material and the material of the second substrate layer is an inorganic material, in the case of wet etching, the inorganic material can be selectively etched by selecting appropriate etching solution, and the influence on the organic material is low. For example, the etching solution has an obvious etching selection between the second substrate material layer and the first substrate layer, so as to prevent the etching solution from etching the first substrate layer.

For example, the first pattern <NUM> is formed by etching the second substrate material layer in the transparent display region <NUM> using the mask plate for forming the second electrode <NUM> in the transparent display region <NUM> as a mask, thus improving the transmittance of blue light in the transparent display region while ensuring that no additional mask plate is needed.

For example, as shown in <FIG>, while forming the first pattern <NUM>, the second substrate material layer located in the transition region <NUM> can be patterned to form the second pattern <NUM> by using the above mask plate.

The PPI of pixel units located in the second pixel density region is even, so the PPI of pixel units located in the transparent display region and the PPI of pixel units located in the transition region are equal. Therefore, a mask region used to form the second electrode in the transparent display region by patterning and a mask region used to form the second electrode in the transition region by patterning are two regions of the same mask plate. That is, a mask plate is used simultaneously to form the second electrodes of the organic light emitting elements located in the transparent display region and the transition region, and the mask region for forming the second electrode in the transparent display region is a part of the mask plate. While patterning to form the first pattern by using a mask plate for forming the second electrode in the transparent display region, the second pattern can be formed, so as to save the process.

For example, as shown in <FIG>, after forming the first pattern <NUM> and the second pattern <NUM>, the fourth substrate layer <NUM> is formed on one side of the second substrate layer <NUM> away from the third substrate layer <NUM>.

For example, the material of the fourth substrate layer <NUM> can be an organic material, such as polyimide, etc. In the embodiment of the present disclosure, by arranging the second substrate layer made of amorphous silicon between the fourth substrate layer and the third substrate layer, the interface adhesion effect between the fourth substrate layer and the third substrate layer can be improved.

For example, the fourth substrate layer <NUM> can be a continuous integral layer.

For example, the fourth substrate layer <NUM> can be formed by coating.

For example, <FIG> is a partial cross-sectional structural view of a display device according to another embodiment of the present disclosure. As shown in <FIG>, the display device provided by the embodiment of the present disclosure includes any one of the above display panels. <FIG> illustratively shows that the display device includes the display panel shown in <FIG>, which is not limited thereto, and the display device can also include the display panel shown in any one of the embodiments as shown in <FIG> and <FIG>. As shown in <FIG>, the display device includes a functional component <NUM> located in the transparent display region <NUM> and at a side opposite to a light emitting side of the display panel, and the functional component <NUM> is configured to emit or receive light passing through the transparent display region. For example, ambient light can be incident on the functional component <NUM> through the transparent display region <NUM>. In the embodiment of the present disclosure, the transmittance of blue light in the transparent display region can be improved by setting the thickness of at least part of the second substrate layer in the transparent display region to be less than the thickness of the second substrate layer outside the transparent display region, so that the functional component can receive more blue light to improve performance.

For example, the functional component <NUM> is located at one side of the base substrate <NUM> away from the organic light emitting element.

For example, the orthographic projection of the functional component <NUM> on the base substrate <NUM> is not overlapped with the transition region <NUM> and the first pixel density region <NUM>.

For example, the functional component <NUM> includes at least one selected from the group consisting of a camera module (e.g., a front camera module), a 3D structured light module (e.g., a 3D structured light sensor), a time-of-flight 3D imaging module (e.g., a time-of-flight sensor), and an infrared sensing module (e.g., an infrared sensor), etc..

In the case where the functional component includes a camera, by adjusting the thickness or shape of the second substrate layer located in the transparent display region, the color cast can be reduced and the photographing effect of the camera can be improved.

For example, the front camera module is usually enabled when the user takes a selfie or makes a video call, and the pixel display region of the display device displays the self-taken image for the user to watch. The front camera module includes, for example, a lens, an image sensor, and an image processing chip, etc. The optical image of the scene generated by the lens is projected onto the surface of the image sensor (the image sensor includes CCD and CMOS) and converted into electrical signals, and the electrical signals are converted into digital image signals after analog-to-digital conversion by the image processing chip, and then, the digital image signals are sent to a processor for processing, and the image of the scene is output on the display screen.

For example, the 3D structured light sensor and the time-of-flight (ToF) sensor can be used for face recognition to unlock display device, etc..

For example, the functional component <NUM> may only include a camera module to realize the function of selfie or video call; and for example, the functional component <NUM> may further include a 3D structured light module or a time-of-flight 3D imaging module to realize face recognition unlocking, etc. The present embodiment includes but is not limited thereto.

The following statements should be noted:.

Claim 1:
A display panel, comprising:
a base substrate (<NUM>), comprising a display region (<NUM>) and a peripheral region (<NUM>) surrounding the display region (<NUM>), the base substrate (<NUM>) comprising a first substrate layer (<NUM>), a third substrate layer (<NUM>) and a second substrate layer (<NUM>) which are sequentially stacked, a material of the second substrate layer (<NUM>) comprising amorphous silicon,
wherein the display region (<NUM>) comprises a transparent display region (<NUM>), the transparent display region (<NUM>) comprises a pixel region (<NUM>) and a light transmission region (<NUM>),
the display panel further comprises a plurality of pixel units (<NUM>), located in the display region (<NUM>) of the base substrate (<NUM>),
wherein the display region (<NUM>) comprises a first pixel density region (<NUM>) and a second pixel density region (<NUM>), a pixel density of the pixel units (<NUM>) located in the first pixel density region (<NUM>) is greater than a pixel density of the pixel units (<NUM>) located in the second pixel density region (<NUM>), and the transparent display region (<NUM>) is located in the second pixel density region (<NUM>),
the display panel comprises a thin film transistor (<NUM>), and the thin film transistor (<NUM>) is located at one side of the third substrate layer (<NUM>) away from the first substrate layer (<NUM>),
characterized in that each of the plurality of pixel units (<NUM>) comprises an organic light emitting layer (<NUM>), and a first electrode (<NUM>) and a second electrode (<NUM>) which are located at both sides of the organic light emitting layer (<NUM>), the second electrode (<NUM>) is connected with the thin film transistor (<NUM>), and the second electrode (<NUM>) of the pixel unit (<NUM>) located in the transparent display region (<NUM>) is located in the pixel region (<NUM>), a thickness of the second substrate layer (<NUM>) located in the light transmission region (<NUM>) is less than a thickness of at least part of the second substrate layer (<NUM>) located outside the transparent display region (<NUM>), wherein the second substrate layer (<NUM>) located in the transparent display region (<NUM>) comprises a first pattern (<NUM>), and an orthographic projection of the first pattern (<NUM>) on the first substrate layer (<NUM>) coincides with an orthographic projection of the second electrode (<NUM>) on the first substrate layer (<NUM>).