Patent Description:
This application relates to the display field, and in particular, to a laminated display module and an electronic device.

As a display technology in a display module develops, a proportion of a screen on a human-computer interaction interface is increasing, and a product with a dual-curved screen has become a mainstream. A curved screen means that the screen is no longer a flat glass cover, and a part of the screen on the left and right sides of the screen is a downwardly curved surface. A dual-curved screen means that the front of the screen is a curved screen, and a back cover at the back of the screen has a specific curvature.

Using a carrier mobile phone in the display module as an example, <FIG> is a schematic diagram of a front shape of a mobile phone with a dual-curved screen according to this application, and <FIG> is a schematic diagram of a back shape of a mobile phone with a dual-curved screen according to this application. In <FIG>, a region A1 and a region B1 are curved surface positions on the front of the mobile phone with a dual-curved screen; and in <FIG>, a region C1 and a region D1 are curved surface positions on the back of the mobile phone with a dual-curved screen. Interface display of the mobile phone with a dual-curved screen is mainly related to a front shape structure of the mobile phone. <FIG> is a schematic diagram of a cross-section structure of a dual-curved screen display module. As shown in <FIG>, a display module in curved surface positions can be structurally divided into a cover layer <NUM>, a thin film packaging layer <NUM>, a display layer <NUM>, and a support membrane layer <NUM> from top to bottom. During lamination of the display module, local curved surface positions may be subjected to relatively high stress due to a difference in a module process. Once a stress value exceeds a stress threshold that the display layer <NUM> can withstand, a crack may occur in the thin film packaging layer <NUM> in the curved surface positions due to a material property. Vapor may pass through the crack to enter a light emitting layer in the display layer <NUM>, then a material of the light emitting layer soon fails under action of the vapor, and a shading may be formed near the crack, which affects a display effect of the display layer <NUM> in the display module. Therefore, the display effect of the display <NUM> in the display module can be ensured by avoiding the crack occurrence in the thin film packaging layer <NUM>.

<CIT> relates to a curved display screen module comprising a cover plate, a display panel and a heat dissipation composite layer which are sequentially stacked, wherein: the cover plate has a flat area and curved areas at least on both sides of the flat area; the display surface of the display panel is attached to the cover plate; and the heat dissipation composite layer is attached to the back of the display panel and includes a heat dissipation layer; wherein the heat dissipation layer has at least two curved side portions, respectively corresponding to the two curved surface areas of the cover plate, and a plurality of holes are provided on the curved side portions.

<CIT> relates to a curved display device, comprising a flat display part located in the middle area and curved display parts adjacent to both sides of the flat display part; a light-emitting layer, a protective layer attached to the back of the light-emitting layer; an encapsulation layer covering the light-emitting layer; and a buffer hole is provided in at least one of the light-emitting layer, the protective layer, and the encapsulation layer corresponding to the curved display part.

<CIT> relates to flexible substrate comprising a plane area and at least one curved area extending in a first direction along the edge of the plane area; the first direction is parallel to the upper surface of the plane area and perpendicular to the plane area edge, the curved area has a curved center line parallel to the upper surface of the plane area and perpendicular to the first direction; each of the curved areas includes a plurality of through hole groups, the through hole group includes at least a first through hole group arranged along the center line of the curved surface, and the first through hole group includes a plurality of spaced arrangement and penetrating through all the through hole groups.

This application provides a laminated display module, to reduce stress sensed by a display layer in curved surface positions during lamination, so as to avoid a crack occurrence in a thin film packaging layer.

According to a first aspect, this application provides a laminated display module, including a cover layer, a thin film packaging layer, a display layer, and a support membrane layer that are sequentially covered through lamination from top to bottom. The cover layer includes a smooth region and two curved surface regions along a longitudinal direction. The two curved surface regions are respectively located on two sides of the smooth region, each curved surface region includes one bending region, and each bending region is projected onto the support membrane layer to form a projection region. The support membrane layer includes a main support region and two side support regions along a longitudinal direction, and a gap is provided between either of the side support regions and the main support region.

The gap is a crack that completely separates two parts, or. in other examples not according to the invention may be one or more geometric shapes that are excavated on a projection region.

In this aspect, the projection regions in the support membrane layer are completely excavated, so that the support membrane layer in the curved surface positions on two sides becomes relatively soft, and the support membrane layer supports the display layer. After the support membrane layer becomes soft in an excavation manner, stress sensed by the entire display layer in the curved surface positions becomes low, thereby avoiding a problem of a crack occurrence in the thin film packaging layer in the curved surface positions.

A width of any gap is equal to a width of a projection region on a same side. Therefore, complete excavation of the projection region is implemented, so that the entire support membrane layer becomes soft, and stress sensed by the entire display layer becomes low.

According to a second aspect, this application further provides an electronic device, including a housing and a laminated display module, and the laminated display module is buckled in the housing. A crack occurrence in a thin film packaging layer in curved surface positions can be avoided based on a structural design of the laminated display module, thereby achieving a better display effect.

The embodiments as detailed along <FIG> are not according to the invention and present for illustrative purposes only.

Technical solutions in embodiments of this application will be clearly described with reference to accompanying drawings in embodiments of this application. Apparently, the described embodiments are merely some rather than all of the embodiments of this application. All other embodiments obtained by a person of ordinary skill in the art based on embodiments of this application without creative efforts shall fall within the protection scope of this application.

An application scenario of this application is that a dual-curved screen display module has been widely used, for example, a most representative mobile phone with a dual-curved screen is highly popular because of a beautiful appearance and full screen display. However, the mobile phone with a dual-curved screen has some defects, for example, the mobile phone with a dual-curved screen may have a more complex process than a common flat-screen mobile phone. A most common case is that a crack and a shading sometimes may occur in curved surface positions on two sides of a dual-curved screen. <FIG> is a schematic diagram of a cross-section structure of a dual-curved screen display module.

As shown in <FIG>, the dual-curved screen display module includes a cover layer <NUM>, a thin film packaging layer <NUM>, a display layer <NUM>, and a support membrane layer <NUM>. A region to which two arrows point is a bending region of the cover layer <NUM>, and the bending region is a bent region where the cover layer <NUM> is actually curved with a specific radian change during lamination. In a manner, the support membrane layer <NUM> covers the entire bending region. A crack occurring in the thin film packaging layer <NUM> are located in curved surface positions on two sides, and are mainly located in a position where the bending region of the cover layer <NUM> is projected onto a plane. As shown in <FIG>, a region E1 in a dashed frame of the thin film packaging layer <NUM> is a range of the cover layer <NUM> projected onto the plane, that is, the region E1 is usually a concentrated region where cracks occur in the thin film packaging layer <NUM>.

In a manner, an attempt to resolve a problem of a crack occurrence in the thin film packaging layer <NUM> is made by using a lamination process, and usually a laminated coverage forming test design and a lamination pressure parameter test design may be first performed. During lamination, the thin film packaging layer <NUM>, the display layer <NUM>, and the support membrane layer <NUM> are first attached to one layer of a carrier film, and then the carrier film and the three layers are all placed in a lamination coverage forming. Under a pressure of forming coverage, the cover layer <NUM> is laminated with the three layers by using an optical clear adhesive. However, during configuration of the lamination process, before lamination, layers are flat, a sudden change occurs at the bending region, and high stress will be generated locally during the sudden change. A material property of the thin film packaging layer <NUM> may result in the crack occurrence in the thin film packaging layer <NUM>. Therefore, the problem of a crack occurrence in the thin film packaging layer <NUM> in the curved surface positions cannot be resolved through the lamination process.

To resolve the foregoing problem, this application provides a laminated display module, to reduce stress sensed by the display layer in the curved surface positions during lamination, so as to avoid the crack occurrence in a thin film packaging layer.

<FIG> is a schematic diagram of a cross-section structure of a laminated display module according to an embodiment of this application. The laminated display module includes a cover layer <NUM>, a thin film packaging layer <NUM>, a display layer <NUM>, and a support membrane layer <NUM> that are sequentially covered through lamination from top to bottom. The cover layer <NUM> includes one smooth region <NUM> and two curved surface regions <NUM> along a longitudinal direction. The smooth region <NUM> is a region presenting a planar effect, and the curved surface regions <NUM> are regions presenting a curved surface effect. The two curved surface regions <NUM> are respectively located on two sides of the smooth region <NUM>, and the two curved surface regions <NUM> have a same structure. A structure of one curved surface region <NUM> is used as an example for description. The curved surface region <NUM> includes a transition region <NUM>, a bending region <NUM>, and an extension region <NUM>. The transition region <NUM> is a region range where the smooth region <NUM> transitions to the curved surface region <NUM>, and usually a bending radian is relatively small. The bending region <NUM> is a region with a relatively large actual bending range during lamination, the extension region <NUM> is usually a lamination junction, and a bending radian is also relatively small. Ranges of the transition region <NUM>, the bending region <NUM>, and the extension region <NUM> may be determined by following a specific rule. For example, the ranges may be determined based on a value of an actual bending curvature range. Bending curvatures of both the transition region <NUM> and the extension region <NUM> are usually less than a bending curvature of the bending region <NUM>. The display layer <NUM> is usually a flexible display made of a soft material. A light-emitting material is included inside the display layer <NUM>, for example, an organic light-emitting diode (organic light-emitting diode, OLED), also referred to as an organic electroluminesence display. The flexible display layer <NUM> is a deformable and bendable display apparatus. The thin film packaging layer <NUM> is configured to protect the light-emitting material inside the flexible display layer <NUM>, so as to prevent the light-emitting material from being corroded by water and oxygen. The cover layer <NUM> is usually a glass cover, and is configured to present a display effect of the flexible display layer <NUM> while protecting the flexible display layer <NUM>. The support membrane layer <NUM> is configured to support the flexible display layer <NUM>.

The thin film packaging layer <NUM> usually uses a technique, such as atomic layer deposition or ink jet printing. For example, the thin film packaging layer <NUM> may include organic layer deposition and inorganic layer deposition. A crack is more likely to occur in the thin film packaging layer <NUM> due to a material property of the thin film packaging layer <NUM>. Once the crack occurs, water and oxygen may penetrate into the light-emitting material inside the display layer <NUM> through the crack, which results in failure of the light-emitting material.

When a module factory produces batches of the dual-curved screen display modules, there may be a specific number of failed products. For example, as shown in <FIG>, for some mobile phone with a dual-curved screens, cracks may occur in regions E in the thin film packaging layer <NUM>, and the regions E are projection regions of the bending regions <NUM> that are located on two sides of the mobile phone with a dual-curved screens and that correspond to the thin film packaging layer <NUM>. When the cracks occur in the regions E in the thin film packaging layer <NUM>, the display <NUM> in the display module cannot normally display a complete effect. To find a specific position of a crack occurrence in the failed product, an implementation may be that when the module factory performs statistical analysis on the failed products, regions E in which a crack easily occur are divided based on different levels, to determine probability distribution of crack occurrences in different positions. In an example, a region E is divided into <NUM> equal parts. <FIG> is a schematic diagram of dividing a region E in a curved surface position into <NUM> equal parts in a display module. The regions E on two sides of the mobile phone have a same division manner and a division range. In <FIG>, one side is used as an example for description, and a schematic diagram of an enlarged part of an intercepted region E is shown in a dotted circle in the figure. In this embodiment of this application, because the cover layer <NUM>, the thin film packaging layer <NUM>, the display layer <NUM>, and the support membrane layer <NUM> are covered through lamination, dividing the region E in the thin film packaging layer <NUM> into <NUM> equal parts means that the four layers are divided into <NUM> equal parts, in other words, each layer corresponds to <NUM> equal subregions. A purpose of dividing an equal subregion is to determine probability distribution of crack defects occurring in the subregions. In <FIG>, <NUM>-<NUM> represent different equal subregions, and subregions <NUM>-<NUM> are respectively the first subregion, the second subregion,. , and the seventeenth subregion.

Specifically, during calculation of crack occurrence probability in the subregions, a possible implementation may be that when the failed products are analyzed, there are a total of <NUM> mobile phones with cracks, and the display layer <NUM> is divided into <NUM> subregions. Because a bending curvature of each subregion is different, stress sensed by the display layer <NUM> in each subregion is also different. Correspondingly, in the <NUM> subregions in the thin film packaging layer <NUM>, crack occurrence probability of each subregion is also different. Crack distribution of the <NUM> subregions in thin film packaging layer <NUM> on two sides of each mobile phone is separately compared, and a result obtained by analyzing failed products is described below. Table <NUM> is a statistical table of crack occurrence frequency of the <NUM> subregions in the thin film packaging layer. Columns <NUM>-<NUM> represent the divided <NUM> subregions in the thin film packaging layer <NUM>, and distribution frequency represents probability distribution of crack occurrence in the subregions in the thin film packaging layer <NUM>.

It can be seen from the statistical analysis result in Table <NUM> that in the thin film packaging layer <NUM>, which subregions have relatively high crack occurrence probability. <FIG> is a diagram of statistical distribution of crack occurrence frequency of a thin film packaging layer <NUM> in a curved surface position. In <FIG>, rows <NUM>-<NUM> represent the <NUM> subregions in the thin film packaging layer <NUM>, and column from <NUM>% to <NUM>% represent probability distribution statistics of crack occurrences in the subregions. It can be intuitively seen from the diagram of statistical distribution in <FIG> that in the thin film packaging layer <NUM>, crack occurrence probability of the subregions <NUM>-<NUM> is relatively high, and therefore, in the display layer <NUM>, stress sensed by subregions <NUM>-<NUM> is relatively high. Crack occurrence probability of both subregions <NUM>-<NUM> and subregions <NUM>-<NUM> is relatively low, and therefore, in the display layer <NUM>, stress sensed by subregions <NUM>-<NUM> and subregions <NUM>-<NUM> is relatively small. It can be learned that crack occurrence in the thin film packaging layer <NUM> has a specific regional feature.

Among the four layers of the cover layer <NUM>, the thin film packaging layer <NUM>, the display layer <NUM>, and the support membrane layer <NUM>, the cover layer <NUM>, the thin film packaging layer <NUM>, and the display layer <NUM> are directly related to a visual presentation effect. If the cover layer <NUM>, the thin film packaging layer <NUM>, and the display layer <NUM> are excavated, the visual presentation effect is directly affected. For the regional feature of cracks in the thin film packaging layer <NUM>, in this application, a projection position that is located in the support membrane layer <NUM> and that corresponds to the bending region <NUM> is completely excavated, and in examples not according to the invention is partially excavated based on the distribution features of crack probability, to resolve the problem of a crack occurrence in the thin film packaging layer <NUM> in the curved surface positions.

Either of the curved surface region <NUM> includes one bending region <NUM>, and each bending region <NUM> is projected onto the support membrane layer <NUM> to form a projection region <NUM>. In this embodiment of this application, the projection position that is located in the support membrane layer <NUM> and that corresponds to the bending regions <NUM> is excavated, in other words, the projection region <NUM> is excavated.

When the projection region <NUM> is excavated, an excavation range needs to meet a specific correspondence. Specifically, a distance projected by the curved surface region <NUM> onto a plane is denoted as A; a distance projected by the bending region <NUM> onto the plane is denoted as B, in other words, an overall width of the projection regions <NUM> is denoted as B; a distance projected by an extension region <NUM> onto the plane is denoted as C; and A, B, and C should meet B≥<NUM>%A, and C≤<NUM>%A. On a basis of a plurality of times of simulation, if the correspondence is followed, it can be ensured that after the projection region <NUM> is excavated, a support effect of the support membrane layer <NUM> is the same as a support effect of the support membrane layer <NUM> before the projection region <NUM> is excavated. In addition, after excavation, the entire support membrane layer <NUM> becomes relatively soft, so that stress sensed by the display layer <NUM> in the curved surface positions becomes low during lamination, thereby avoiding the problem of a crack occurrence in the thin film packaging layer <NUM>.

The support membrane layer <NUM> includes a main support region <NUM>, two projection regions <NUM>, and two side support regions <NUM> along a longitudinal direction. A gap is provided between either of the side support regions <NUM> and the main support region <NUM>. In this embodiment of this application, the gap is a crack that completely separates two parts, or in examples not according to the invention may be one or more geometric shapes that are excavated on a projection region. When the projection regions <NUM> are excavated, there are two types of excavation manners: complete excavation and partial excavation, and the following separately describes two manners. A complete excavation manner means that the projection regions <NUM> are completely excavated regardless of crack occurrence frequency in the thin film packaging layer <NUM> in the curved surface positions. In this case, the gap is the crack that completely separates the main support region <NUM> from the side support region <NUM>, and a width of the crack is a width of a projection region <NUM> on a same side. The complete excavation manner does not consider that in the thin film packaging layer <NUM>, which subregions have high crack occurrence probability and which subregions have low crack occurrence probability. Provided that the regions are the projection regions <NUM> corresponding to projection of the bending regions <NUM>, the projection regions <NUM> in the support membrane layer <NUM> are completely excavated.

<FIG> is a schematic diagram of a structure of complete excavation of a support membrane layer corresponding to projection of bending regions. At the cover layer <NUM>, projection regions that are located in the support membrane layer <NUM> and that correspond to the bending regions <NUM> are the projection regions <NUM>. After the projection regions <NUM> are completely excavated, the support membrane layer <NUM> is no longer an integrated structure, and the support membrane layer <NUM> is divided into one main support region <NUM> and two side support regions <NUM>. There are gaps between the main support region <NUM> and each of side support regions <NUM>, and the gaps are two columns of excavated projection regions <NUM>. That is, widths of the gaps are widths of the projection regions <NUM>, which is equivalent to excavation of two arched edges in the curved surface positions of the support membrane layer <NUM>.

The partial excavation manner means that crack occurrence frequency of the thin film packaging layer <NUM> in the curved surface positions, the projection regions <NUM> are pertinently and partially excavated based on crack occurrence probability. During partial excavation, the statistical result of crack occurrence frequency of the <NUM> subregions in the thin film packaging layer <NUM> in Table <NUM> can be combined. In Table <NUM>, crack occurrence probability of the <NUM> equal subregions has the following features: Crack occurrence frequency of subregions <NUM>-<NUM> is relatively high, and correspondingly, subregions <NUM>-<NUM> have relatively high stress. Crack occurrence frequency in other subregions is relatively low, and correspondingly, stress in the other regions is also relatively low. In subregions <NUM>-<NUM>, crack occurrence frequency of subregion <NUM> reaches a maximum value, crack occurrence frequency of subregion <NUM>, subregion <NUM>, and subregion <NUM> is only lower than the crack occurrence frequency of subregion <NUM>. When the projection regions <NUM> in the support membrane layer <NUM> are partially excavated, various forms of excavation may be performed with reference to the features of crack occurrence frequency.

With reference to <FIG>, the regions E are projection regions of the bending regions <NUM> that are located on the two sides of the mobile phone with a dual-curved screen and that correspond to the thin film packaging layer <NUM>; regions B are projection regions <NUM> that are located in the support membrane layer <NUM> and that correspond to the bending regions <NUM>, and thin film packaging layer <NUM>, the display layer <NUM>, and the support membrane layer <NUM> are covered through lamination. Therefore, it can be learned that widths of the regions E are equal to widths of the regions B. When a region E is equally divided into <NUM> subregions, a region B, namely the projection region <NUM>, is equally divided into <NUM> subregions in a same way.

In the manner of partial excavating the projection regions <NUM>, the gaps include M excavation regions <NUM>, where M is a positive integer and M≥<NUM>. <FIG> is a schematic diagram of an enlarged structure of partial excavation of projection regions in a display module.

In <FIG>, excavated geometric figures are the excavation regions <NUM>. With reference to this embodiment of this application, each projection region <NUM> is divided into <NUM> equal parts. Assuming that one geometric figure in each subregion is excavated, M is <NUM>. The <NUM> excavated geometric figures may be arbitrarily distributed. However, to enable stress sensed by same subregions on two sides of the display layer <NUM> to be same, this embodiment of this application uses the following implementation: The M excavation regions <NUM> are symmetrically distributed in the two projection regions <NUM>, and M is an even number. Correspondingly, as shown in <FIG>, each projection region <NUM> includes M/<NUM> excavation regions <NUM>. Specifically, a same subregion mean that when each projection region <NUM> is vertically divided into <NUM> equal parts, the main support region <NUM> is used as reference, and each projection region <NUM> is sequentially divided to two sides. As shown in the figure, a front view of <FIG> is used as an example, on a left side of the main support region <NUM>, subregions of a projection region <NUM> are sequentially divided into subregion <NUM>, subregion <NUM>,. , subregion <NUM>, and subregion <NUM> from left to right, and not all the subregions on the left side are drawn in the figure. Correspondingly, on a right side of the main support region <NUM>, a projection region <NUM> is sequentially divided into subregion <NUM>, subregion <NUM>,. , and subregion <NUM> from left to right. As shown in the figure, in the two projection regions <NUM>, subregion <NUM> on the left side and subregion <NUM> on the right side are a same subregion, subregion <NUM> on the left side and subregion <NUM> on the right side are a same subregion, and so on. In <FIG>, proportions of the main support region <NUM> and the two projection regions <NUM> are only drawn as an example and do not represent actual shapes. A reason for using this implementation is as follows: Assuming that the M excavation regions <NUM> are arbitrarily distributed, the excavation regions <NUM> corresponding to the projection regions <NUM> on two sides of same subregions may be different, and correspondingly, stress sensed by the display layer <NUM> in the same subregions may be different. Different stress may cause different crack occurrence probability of the thin film packaging layer <NUM>, and therefore in a same subregion, a crack may occur on one side and no crack may occur on the other side. To avoid this situation, symmetrical distribution of the geometric figures on two sides is used as a manner for excavation. Shapes of the excavation regions <NUM> include, but are not limited to, one or a combination of more than one of a circular shape, a square shape, a rhombic shape, an oval shape, a triangular shape, a star shape, and an irregular shape. In this way, the excavation schemes do not need to be limited during excavation, provided that excavated geometric figures in the same subregions are symmetrical and areas of the excavation regions <NUM> are the same.

The following separately describes several partial excavation manners. Partial excavation can be divided into a first category and a second category based on different categories, where the first category is an even excavation manner and the second category is an uneven excavation manner. When the cover layer <NUM>, the thin film packaging layer <NUM>, the display layer <NUM>, and the support membrane layer <NUM> are divided based on different subregions, division based on different subregions on two sides of the screen is the same, and excavated geometric figures and excavation areas are also the same. The following uses an excavation manner on one side as an example for detailed description, and the other side is not described herein again. Details are provided below. In the first category, that is, the even excavation manner, even distribution of crack occurrence probability of the thin film packaging layer <NUM> in a curved surface position is taken into consideration. Assuming that a difference in crack occurrence probability of the <NUM> equal subregions is not large, an excavation range in each subregion is the same, in other words, areas of the M excavation regions <NUM> are equal.

In an implementation, <FIG> is a schematic diagram of an enlarged structure of even excavation of a projection region on one side. In subregions <NUM>-<NUM> of the projection region <NUM>, quantities and shapes of excavation regions <NUM> in all the subregions are completely the same, and the shapes and quantities of columns of the excavation regions <NUM> are not specifically limited. For example, in <FIG>, a plurality of circular regions are evenly excavated, and a quantity of circular regions and sizes of the excavation shapes are the same, thereby ensuring a same total area of the excavation region <NUM> in each subregion. The projection region <NUM> is evenly excavated, so that the curved surface positions of the support membrane layer <NUM> become relatively soft, and stress sensed by the display layer <NUM> in the curved surface positions become low, thereby avoiding the problem of a crack occurrence in the thin film packaging layer <NUM> in the curved surface positions. In the second category, that is, the uneven excavation manner, with reference to the distribution features of crack occurrence probability of the subregions in the thin film packaging layer <NUM>, a general idea is to set an excavation range based on crack occurrence probability of each subregion, and with reference to a case in which distribution of crack occurrence frequency of the thin film packaging layer <NUM> in Table <NUM> corresponds to stress values sensed by the subregions in the display layer <NUM>, several possible uneven excavation manners are described below.

A possible uneven excavation manner is that on a basis of distribution of crack probability values of the subregions in the thin film packaging layer <NUM>, <NUM> equal subregions are grouped into two groups based on crack probability values. One grouping threshold may be preset, a group whose crack probability value is greater than the grouping threshold is one group, and a group whose crack probability value is less than or equal to the grouping threshold is the other group. For example, if a crack occurrence probability value <NUM>% is used as a grouping threshold, with reference to Table <NUM>, crack occurrence probability of subregions <NUM>-<NUM> in the thin film packaging layer <NUM> is greater than <NUM>%, so that in the projection region <NUM>, the excavation regions <NUM> corresponding to subregions <NUM>-<NUM> are grouped into a first group <NUM>. Correspondingly, if crack occurrence probability of subregions <NUM>-<NUM> and subregions <NUM>-<NUM> in the thin film packaging layer <NUM> is less than <NUM>%, in the projection region <NUM>, the excavation regions <NUM> corresponding to subregions <NUM>-<NUM> and subregions <NUM>-<NUM> are grouped into second groups <NUM>. That is, in the uneven excavation manner, the M excavation regions <NUM> include at least one first group <NUM> and at least one second group <NUM>, and an area of the first group <NUM> is greater than an area of the second group <NUM>.

In the first group <NUM>, crack probability values of subregions <NUM>-<NUM> are large, and therefore stress sensed by subregions <NUM>-<NUM> in the display layer <NUM> is relatively high. In the second groups <NUM>, crack probability values of subregions <NUM>-<NUM> and subregions <NUM>-<NUM> are small, and therefore stress sensed by subregions <NUM>-<NUM> and subregions <NUM>-<NUM> in the display layer <NUM> is relatively low. In this case, the used uneven excavation manner is that excavation ranges of regions with relatively high stress are relatively large, and excavation ranges of regions with relatively low stress are relatively small.

<FIG> is a schematic diagram of an enlarged structure of uneven excavation of a projection region on one side. In each of subregions <NUM>-<NUM>, a length of the projection region <NUM> in the support membrane layer <NUM> is the same. If the entire support membrane layer <NUM> is of a same thickness, a larger excavation size of the projection region <NUM> indicates a larger excavation area. On a basis of the distribution features of crack occurrence probability of the subregions, in this embodiment of this application, the M excavation regions <NUM> include two second groups <NUM> that respectively include subregions <NUM>-<NUM> and subregions <NUM>-<NUM>, and include one first group <NUM> that includes subregions <NUM>-<NUM>. The first group <NUM> is disposed between the two second groups <NUM>. Because in the thin film packaging layer <NUM>, crack occurrence probability of subregions <NUM>-<NUM> is relatively high and crack occurrence probability of subregions <NUM>-<NUM> and subregions <NUM>-<NUM> is relatively low, during uneven excavation, areas of the excavation regions <NUM> in subregions <NUM>-<NUM> are relatively large, and areas of the excavation regions <NUM> in subregions <NUM>-<NUM> and subregions <NUM>-<NUM> are relatively small. As shown in <FIG>, the area of the first group <NUM> is greater than the areas of the second groups <NUM>. In this excavation manner, the main support region <NUM> and the side support region <NUM> are not separated, and a gap is an excavated hole. When subregions <NUM>-<NUM> are completely excavated, the main support region <NUM> and the side support region <NUM> may be separated, and a gap is a crack, but in this case, a width of the crack is less than a width of the projection region <NUM>.

If crack probability distribution and the <NUM> subregions in this embodiment of this application have different rules, for example, if crack probability is relatively scattered, there may be a plurality of first groups <NUM> and a plurality of second groups <NUM>. When there are a plurality of groups, the first groups <NUM> and the second groups <NUM> are usually disposed at intervals.

It can be seen that the first uneven excavation manner follows the following principle: Crack occurrence probability is generally classified, for example, classified into a high crack probability region and a low crack probability region. In the relatively high crack probability region, an excavation range of the projection region <NUM> is relatively large; and conversely, in the relatively low crack probability region, an excavation range of the projection region <NUM> is relatively small. The first groups <NUM> and the second groups <NUM> that are on a same side are disposed at intervals, so that crack probability distribution can be intuitively reflected based on an area difference. In addition, this manner has an advantage that adaptive excavation is performed based on approximate crack occurrence probability, so that the entire support membrane layer <NUM> after excavation is adapted to stress distribution, and it is easily to implement in a process.

Another possible uneven excavation manner is that on a basis of the forgoing uneven excavation manner, crack occurrence probability of the thin film packaging layer <NUM> and stress sensed by the subregions are further limited. For example, with reference to Table <NUM> and <FIG>, in subregions <NUM>-<NUM>, crack occurrence probability of subregion <NUM> is the highest, in other words, stress sensed by subregion <NUM> is the highest; crack occurrence probability of subregion <NUM> is the second highest, and is only lower than crack occurrence probability of subregion <NUM>; and crack occurrence probability of subregions <NUM>-<NUM> is lower than crack occurrence probability of subregion <NUM> and subregion <NUM>, and crack occurrence probability is the third highest. Other subregions are arranged in descending order of crack occurrence probability. Among other subregions, the crack occurrence probability of subregions <NUM>-<NUM> is close to that of subregions <NUM>-<NUM>, and the crack occurrence probability of subregions <NUM>-<NUM> is close to that of subregion <NUM>. In this case, the excavation manner used for the projection region <NUM> may be that based on specific crack occurrence probability values of the subregions in the thin film packaging layer <NUM>, the subregions in the projection region <NUM> are excavated based on proportions of crack occurrence probability.

To avoid a case in which a crack occurs on one side due to different stress sensed by two sides of the display layer <NUM>, this embodiment of this application still considers that areas of the excavation regions <NUM> in same subregions on two sides are the same.

Assuming that the two projection regions <NUM> have M excavation regions <NUM> in total, each side has M/<NUM> excavation regions <NUM>. In the projection region <NUM> on any side, areas of the M/<NUM> excavation regions <NUM> are partially equal or all unequal. Any excavation region <NUM> has a corresponding crack probability value, and areas of excavation regions <NUM> with large crack probability values are greater than areas of excavation regions <NUM> with small crack probability values, in other words, crack probability values are positively correlated with areas of excavation regions <NUM>.

<FIG> is a schematic diagram of an enlarged structure of another uneven excavation of a projection region on one side. The figure shows an excavation effect in which the crack probability values are positively correlated with the areas of the excavation regions <NUM>. In subregions <NUM>-<NUM>, crack occurrence probability of subregion <NUM> is the highest, so that <NUM>% of an entire region range of subregion <NUM> may be excavated; crack occurrence probability of subregion <NUM> is the second highest, so that <NUM>% of an entire region range of subregion <NUM> may be excavated; and crack occurrence probability of subregions <NUM>-<NUM> is the third highest, so that <NUM>% of an entire region range of subregions <NUM>-<NUM> may be excavated. Among other subregions, crack occurrence probability of subregions <NUM>-<NUM> is close to that of subregions <NUM>-<NUM>, and average crack occurrence probability of subregions <NUM>-<NUM> and subregions <NUM>-<NUM> is about half of the crack occurrence probability of subregion <NUM>, so that <NUM>% of an entire region range of subregions <NUM>-<NUM> and subregions <NUM>-<NUM> may be excavated; and crack occurrence probability of subregions <NUM>-<NUM> is close to that of subregion <NUM>, and crack occurrence probability of subregions <NUM>-<NUM> and subregion <NUM> is relatively small, so that <NUM>% of an entire region range of subregions <NUM>-<NUM> and subregion <NUM> may be excavated. In this excavation manner, the main support region <NUM> and the side support region <NUM> are also not separated, and a gap is still an excavated hole.

It can be learned that this uneven excavation manner follows the following principle: Targeted classification is performed based on crack occurrence probability, for example, excavation regions are arranged in descending order of crack occurrence probability. Higher crack occurrence probability indicates a larger excavation range, and conversely, lower crack occurrence probability indicates a smaller excavation range. This manner has an advantage that targeted excavation is performed based on actual crack occurrence probability values, so that an excavation area of the projection region <NUM> is proportional to crack occurrence probability of the subregions in the thin film packaging layer <NUM>, that is, in the thin film packaging layer <NUM>, subregions with high crack occurrence probability indicates large areas of the excavation regions <NUM>; and in this case, remaining areas of the projection region <NUM> become small. In this way, stress sensed by the display layer <NUM> here is previously extremely large, but after excavation, stress sensed by the display layer <NUM> becomes significantly small, and correspondingly, the subregions are excavated in this manner, so that the excavation regions <NUM> of the projection regions <NUM> on two sides completely correspond to crack probability distribution, thereby avoiding crack occurrence to a maximum extent.

With reference to Table <NUM> and <FIG>, it can be found, according to the statistical analysis result of crack occurrence probability of the <NUM> subregions in the thin film packaging layer <NUM>, that crack occurrence probability generally has a specific rule, that is, crack occurrence probability reaches a peak at a specific position, and probability on two sides generally becomes gradually small. In this embodiment of this application, still another uneven excavation manner may be that one or two regions in the center are used as reference subregions, excavation areas of the regions in the center are the largest, excavation areas of remaining regions are centered on the reference subregions, and successively decrease to two sides. The areas of the one or two excavation regions <NUM> in the center are greater than areas of the excavation regions <NUM> on two sides, and the areas of the excavation regions <NUM> on two sides show a gradient decrease from the center to the two sides.

<FIG> is a schematic diagram of an enlarged structure of still another uneven excavation of a projection region on one side. In this uneven excavation manner, for subregions <NUM>-<NUM> of projection region <NUM> on any side, subregion <NUM> is a reference subregion in the center, and an area of an excavation region <NUM> in subregion <NUM> may be set to <NUM>% of an entire region area in subregion <NUM>, in other words, <NUM>% of the area of subregion <NUM> is excavated. In this case, according to the rule that the areas of the excavation regions <NUM> on the two sides successively decrease, a decreasing threshold may be preset. Assuming that a decreasing threshold is set to <NUM>%, subregion <NUM> is used as a center, areas of the excavation regions <NUM> in other subregions on two sides of subregion <NUM> successively decrease by <NUM>%. According to this rule, in subregion <NUM> and subregion <NUM>, <NUM>% of an entire subregion range is excavated; in subregion <NUM> and subregion <NUM>, <NUM>% of an entire subregion range is excavated; in subregion <NUM> and subregion <NUM>, <NUM>% of an entire subregion range is excavated; and so on; and in subregion <NUM> and subregion <NUM>, <NUM>% of an entire subregion range is excavated.

This excavation manner is based on the feature that crack probability distribution reaches a peak at a specific position, which is similar to the rule in this embodiment of this application that a reference subregion is used as a center and areas of the excavation regions on the two sides successively decrease. This manner has an advantage that with reference to the distribution features of crack occurrence probability, and assuming that a central position of the subregions is a stress accumulation position, reference subregion <NUM> in the center is used as a demarcation point, and the subregions are excavated to the two sides in a successively decreased manner, so that areas of the excavation regions <NUM> in subregions <NUM>-<NUM> generally correspond to stress distribution, and it is also easy to implement in a process.

During complete excavation or partial excavation of the projection regions <NUM> of the support membrane layer <NUM>, two manners may be used for implementation. In one manner, when a manufacturer processes a raw material of the support membrane layer <NUM>, a region stress accumulation position may be simulated, and a groove of a specific figure is directly formed in a die cutting or laser cutting manner. In the other manner, after the support membrane layer <NUM> is laminated with the display layer <NUM>, a module factory uses a laser cutting manner to form a groove of a specific figure.

Regardless of complete excavation or partial excavation of the projection regions <NUM>, a same purpose is to enable the support membrane layer <NUM> in the curved surface positions to become relatively soft in an excavation manner. The support membrane layer <NUM> supports the display layer <NUM>, after the support membrane layer <NUM> becomes soft in the excavation manner, stress sensed by the entire display layer <NUM> in the curved surface positions becomes low, thereby avoiding the problem of a crack occurrence in the thin film packaging layer <NUM> in the curved surface positions. <FIG> is a diagram of a stress simulation result of complete excavation and partial excavation of a laminated display module through simulation. After all layers of the laminated display module are laminated, it can be seen from <FIG> that if the support membrane layer <NUM> is complete, that is, different external forces are exerted on the support membrane layer <NUM> without excavation of the projection regions <NUM>, in the curved surface positions, a stress range sensed by the display layer <NUM> is <NUM> Mpa to <NUM> MPa, and after the projection regions <NUM> are completely excavated or partially excavated, a stress range sensed by the display layer <NUM> through simulation is <NUM> Mpa to <NUM> Mpa. Therefore, it can be learned that stress sensed by the display layer <NUM> is significantly reduced, thereby avoiding a case in which a stress value exceeds a stress threshold that the display layer <NUM> can bear, and further avoiding the problem of a crack occurrence in the thin film packaging layer <NUM>.

This application further provides an electronic device. <FIG> is a schematic diagram of a structure of an electronic device according to an embodiment of this application. The electronic device includes a housing <NUM> and a laminated display module, and the laminated display module is buckled in the housing <NUM>. The laminated display module herein is the laminated display module in the foregoing embodiment. A crack occurrence in a thin film packaging layer in curved surface positions can be avoided based on a structural design of the laminated display module, thereby achieving a better display effect of the electronic device.

This application is applicable to a terminal electronic device with curved surface shapes, for example, the terminal electronic device includes but is not limited to a mobile phone with a dual-curved screen, a tablet, or the like. For application of the technical solutions provided in the embodiments of this application in another design, details are not described herein again. Based on the teaching on the technical concepts in the embodiments of this application, a person skilled in the art can further consider applying the technical solutions in the embodiments of this application to the another design, and these designs does not go beyond the protection scope of the embodiments of this application.

Claim 1:
A laminated display module, comprising:
a cover layer (<NUM>), a thin film packaging layer (<NUM>), a display layer (<NUM>), and a support membrane layer (<NUM>) that are sequentially covered through lamination from top to bottom, wherein
the cover layer (<NUM>) comprises a planar region (<NUM>) and two curved surface regions (<NUM>) along a longitudinal direction, the two curved surface regions (<NUM>) are respectively located on two sides of the planar region (<NUM>), wherein each curved surface region (<NUM>) comprises one bending region (<NUM>), and each bending region (<NUM>) is projected onto the support membrane layer (<NUM>) to form a projection region (<NUM>); and
the support membrane layer (<NUM>) comprises a main support region (<NUM>) and two side support regions (<NUM>) along a longitudinal direction, and a gap is provided between each of the side support regions (<NUM>) and the main support region (<NUM>), wherein a width of the respective gap is equal to a width of a projection region (<NUM>) on a same side, and the gaps are completely excavated, such that the main support region (<NUM>) and the two side support regions (<NUM>) are completely separated from each other by the gaps.