CN108089386A - Cover plate, display module and mobile terminal - Google Patents

Abstract

The application relates to a cover plate, a display module and a mobile terminal, wherein the cover plate is used for covering the display screen. The cover plate comprises a substrate and an electroluminescent ink layer. The substrate is transparent and has a first surface facing the display screen and a second surface facing away from the display screen. The electroluminescent ink layer is arranged on the first surface, the inner edge of the electroluminescent ink layer defines a window area of the substrate, the orthographic projection of the electroluminescent ink layer on the display screen shields all non-display areas of the display screen, and the electroluminescent ink layer can emit light when being electrified. When the display screen is lightened, the non-display area is shielded by the electroluminescent ink layer, and the black edge in the window area becomes invisible, so that the display effect of the display screen can be beautified. The electroluminescent ink layer can emit light when being electrified, and the electroluminescent ink layer can also emit light with different colors, so that a good decorative effect can be achieved on the appearance of the mobile terminal.

Description

Cover plate, display module and mobile terminal

technical field

The present application relates to the technical field of mobile terminals, in particular to a cover, a display module and a mobile terminal.

Background technique

The display screen of a mobile terminal (mobile phone, tablet, etc.) generally includes a display area and a non-display area. When the display screen is on, a black non-display area can be observed through the cover plate, resulting in black borders on the display screen, which adversely affects the appearance of the mobile terminal.

Contents of the invention

Embodiments of the present application provide a cover plate, a display module, and a mobile terminal, so as to solve the problem that the black border of the display screen adversely affects the appearance of the mobile terminal.

A kind of cover plate, is used for being set on the display screen, and described cover plate comprises:

a substrate, which is transparent; the substrate has a first surface facing the display screen and a second surface facing away from the display screen; and

The electroluminescent ink layer is arranged on the first surface, the inner edge of the electroluminescent ink layer defines the window area of the substrate, and the positive side of the electroluminescent ink layer on the display screen The projection blocks all non-display areas of the display screen; the electroluminescent ink layer can emit light when electrified.

In one of the embodiments, the electroluminescent ink layer includes a first single layer and a second single layer, the first single layer is disposed on the first surface, and the inner edge of the first single layer defines out of the window area, and the front projection of the first single layer on the display screen blocks all the non-display areas; the second single layer is arranged on the first single layer facing the display screen one side; the first monolayer can emit light of a first color when energized, and the second monolayer can emit light of a second color when energized.

In one of the embodiments, the orthographic projection of the inner edge of the electroluminescent ink layer on the display screen is located in the display area of the display screen, and the inner edge of the electroluminescent ink layer is in the The distance between the orthographic projection on the display screen and the edge of the display area is less than 0.15mm.

In one of the embodiments, the cover plate further includes a reflective layer, the reflective layer is arranged on the outer periphery of the window area, and the reflective layer is connected to the electroluminescent ink layer, and the reflective layer is used for To prevent the light emitted from the display screen from passing through the electroluminescence ink layer.

In one of the embodiments, the orthographic projection of the inner edge of the reflective layer on the display screen coincides with the edge of the display area of the display screen.

In one of the embodiments, the reflective layer is a silver reflective layer, the reflective layer has a reflective surface, the reflective surface is a plane, the reflective surface faces the display area of the display screen, and the reflective surface The included angle with the display screen is an acute angle.

In one of the embodiments, the cover plate further includes a shading member, the shading member is arranged on the side of the electroluminescent ink layer facing the display screen, and the shading member is located on the side of the window area. Periphery; the shading member is used to prevent the light emitted by the electroluminescence ink layer from entering the display area of the display screen.

In one of the embodiments, the orthographic projection of the inner edge of the shading member on the display screen coincides with the orthographic projection of the inner edge of the electroluminescent ink layer on the display screen.

A display module includes a display screen and the above-mentioned cover plate, and the cover plate is arranged on the display screen.

A mobile terminal includes a rear case and the above-mentioned display module, the display screen is at least partially accommodated in the rear case, and the cover plate is fixedly connected to the rear case.

In one of the embodiments, the rear case includes a body and a boss, the body and the boss are integrally formed, the cover plate is connected to the body; the body has an abutment surface, and the boss The maximum distance between the end of the stage and the abutment surface is smaller than the maximum distance between the second surface and the abutment surface.

For the above-mentioned cover plate, display module and mobile terminal, the first surface of the substrate of the cover plate is provided with an electroluminescent ink layer, and the positive projection of the electroluminescent ink layer on the display screen blocks all non-display areas of the display screen. When the display screen is lit, the non-display area is blocked by the electroluminescent ink layer, and the black border in the window area becomes invisible, thereby beautifying the display effect of the display screen. The electroluminescent ink layer can communicate with the microprocessor of the mobile terminal, and can also communicate with the independent control module provided inside the mobile terminal. The electroluminescent ink layer can emit light when it is powered on, and the electroluminescent ink layer can also It emits light of different colors, so the power-on and power-off of the electroluminescent ink layer can be controlled by the microprocessor or the control module, thereby having a better decorative effect on the appearance of the mobile terminal.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a perspective view of a mobile terminal in an embodiment;

FIG. 2 is a front view of the mobile terminal shown in FIG. 1;

Fig. 3 is a sectional view along A-A in an embodiment of the mobile terminal shown in Fig. 2;

Fig. 4 is a sectional view of a display module in an embodiment of the mobile terminal shown in Fig. 3;

5 is a sectional view of a display module in another embodiment of the mobile terminal shown in FIG. 3;

Fig. 6 is a sectional view along A-A in another embodiment of the mobile terminal shown in Fig. 2;

FIG. 7 is a cross-sectional view of the display module of the mobile terminal shown in FIG. 6;

Fig. 8 is a sectional view along A-A in another embodiment of the mobile terminal shown in Fig. 2;

FIG. 9 is a cross-sectional view of a display module in an embodiment of the mobile terminal shown in FIG. 8;

FIG. 10 is a cross-sectional view of a display module in another embodiment of the mobile terminal shown in FIG. 8;

Fig. 11 is a sectional view of a display module in another embodiment of the mobile terminal shown in Fig. 8;

Fig. 12 is a sectional view of a display module in another embodiment of the mobile terminal shown in Fig. 3;

FIG. 13 is a cross-sectional view of a display module in another embodiment of the mobile terminal shown in FIG. 3 .

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As used herein, a "mobile terminal" (or simply "terminal") includes, but is not limited to, configured to direct cable connection, and/or another data connection/network) and/or via (for example, for cellular networks, wireless local area networks (WLAN), digital television networks such as DVB-H networks, satellite networks, AM-FM broadcast transmitters , and/or a device for receiving/sending communication signals via a wireless interface of another communication terminal. Mobile terminals arranged to communicate over a wireless interface may be referred to as "wireless mobile terminals", "wireless terminals" and/or "communication terminals". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; Personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data communication capabilities; may include radiotelephones, pagers, Internet/Intranet access , a PDA with a web browser, organizer, calendar, and/or Global Positioning System (GPS) receiver; and a conventional laptop and/or palm-type receiver or other electronic device including a radiotelephone transceiver.

Referring to FIG. 1 and FIG. 2 , in one embodiment, the mobile terminal 10 is a mobile phone, the mobile terminal 10 includes a display module 100 and a rear case 200 , and the display module 100 is fixedly connected to the rear case 200 . Referring to FIG. 3 and FIG. 4 at the same time, in one embodiment, the display module 100 includes a cover plate 110 and a display screen 120 , the cover plate 110 covers the display screen 120 , and the display screen 120 is at least partially housed in the rear case 200 , And the cover plate 110 is fixedly connected with the rear case 200 . In one embodiment, the display screen 120 includes a display area 121 and a non-display area 123 (BM area, Black Matrix). The display area 121 can be used to display information and provide an interactive interface for the user. In one embodiment, the display screen 120 adopts an LCD (Liquid Crystal Display, liquid crystal display) screen for displaying information, and the LCD screen can be a TFT (Thin Film Transistor, thin film transistor) screen or an IPS (In-Plane Switching, plane switching) Screen or SLCD (Splice Liquid Crystal Display, special splicing liquid crystal display) screen. In other implementation manners, the mobile terminal 10 may also be a tablet or the like.

In one embodiment, the cover plate 110 includes a substrate 111 and an electroluminescent ink layer 113 . The substrate 111 is transparent, and the shape of the substrate 111 is roughly a rectangular block. The material of the substrate 111 can be glass or sapphire, and the substrate 111 has good light transmission performance. In one embodiment, the substrate 111 has a first surface 1111 facing the display screen 120 and a second surface 1113 facing away from the display screen 120 , and the electroluminescent ink layer 113 is disposed on the first surface 1111 . The inner edge of the electroluminescent ink layer 113 defines the window area 300 of the substrate 111, and the orthographic projection of the electroluminescent ink layer 113 on the display screen 120 blocks all non-display areas 123 of the display screen 120, and the electroluminescent ink layer 113 Can glow when powered on. In one embodiment, the electroluminescent ink layer 113 includes a binder and electroluminescent particles, and the electroluminescent particles emit light when an electric current passes through them. Other components may be added to the binder to make the electroluminescent ink layer The transparency of 113 is reduced, so as to have a better shielding effect on the non-display area 123 . In one embodiment, the window area 300 defined by the electroluminescent ink layer 113 is adapted to the display area 121 of the display screen 120 . It can be understood that the fit between the window area 300 and the display area 121 means that the orthographic projection of the window area 300 on the display screen 120 coincides with the display area 121 . It can be understood that slight deviations caused by process errors should also be understood as belonging to the case of overlap mentioned in this application. For example, when the ratio of the distance between the orthographic projection of the edge of the window area 300 on the display screen 120 and the edge of the display area 121 to the width of the display area 121 is less than 1%, it can be considered that the window area 300 is on the display screen 120. The orthographic projection of is coincident with the display area 121.

3 and 4, in one embodiment, the orthographic projection of the inner edge of the electroluminescent ink layer 113 on the display screen 120 is located in the display area 121 of the display screen 120, and the inner edge of the electroluminescent ink layer 113 The distance between the orthographic projection on the display screen 120 and the edge of the display area 121 is less than 0.15 mm. That is, when printing the electroluminescent ink layer 113, the area of the window area 300 can be made smaller than the area of the display area 121 of the display screen 120, and the distance between the inner edge of the electroluminescent ink layer 113 and the edge of the display area 121 can be less than 0.15 mm. Through the above settings, it is possible to prevent the non-display area 123 of the display screen 120 from being exposed from the window area 300 due to the dislocation of the installation of the cover plate 110 and the display screen 120, so that the non-display area 123 of the display screen 120 can be effectively hidden to beautify the mobile terminal display effect. It can be understood that, for the blocked pixels of the display area 121 , a software control method can be used to make these pixels not emit light, so as to prevent adverse effects on the display of the display screen 120 . Further, in one embodiment, the orthographic projection of the inner edge of the electroluminescent ink layer 113 on the display screen 120 coincides with the edge of the display area 121 of the display screen 120, that is, the window area 300 of the cover plate 110 can be aligned with the display screen 120. The display area 121 is aligned. Since the orthographic projection of the inner edge of the electroluminescent ink layer 113 on the display screen 120 coincides with the edge of the display area 121 , when the display screen 120 is turned on, all pixels in the display area 121 are available for display.

The above-mentioned cover plate 110, the first surface 1111 of the substrate 111 of the cover plate 110 is provided with an electroluminescent ink layer 113, and the positive projection of the electroluminescent ink layer 113 on the display screen 120 blocks all non-display areas 123 of the display screen 120 , when the display screen 120 is lit, the non-display area 123 is blocked by the electroluminescent ink layer 113 , and the black border in the window area 300 becomes invisible, thereby beautifying the display effect of the display screen 120 . The electroluminescence ink layer 113 can communicate with the microprocessor of the mobile terminal 10, and can also communicate with the independent control module provided inside the mobile terminal 10. The electroluminescence ink layer 113 can emit light when it is powered on, and the electroluminescence The ink layer 113 can also emit light of different colors, so the power-on and power-off of the electroluminescent ink layer 113 can be controlled by a microprocessor or a control module, thereby having a better decorative effect on the appearance of the mobile terminal 10 .

In one embodiment, the rear case 200 is made of a metal material such as aluminum alloy. Referring to FIG. 3 , in one embodiment, the rear case 200 includes a body 210 and a boss 220, the body 210 and the boss 220 are integrally formed, the cover plate 110 is arranged on the body 210 and is fixedly connected with the body 210, and the boss 220 is located on the base plate On the edge of the substrate 111 , the boss 220 forms a half-wrapped structure on the edge of the substrate 111 , and the boss 220 can well protect the edge of the substrate 111 . Furthermore, in one embodiment, the body 210 has a resisting surface 211 , the resisting surface 211 is a plane, and the resisting surface 211 is provided with a dispensing layer 400 , and the cover 110 is fixedly connected to the body 210 through the dispensing layer 400 . The way of dispensing glue is not only conducive to the fixed connection between the cover plate 110 and the rear case 200 , but also prevents the width of the frame of the rear case 200 from being too large, which is beneficial to obtain the effect of a narrow frame, and further helps to beautify the appearance of the mobile terminal 10 . In one embodiment, the maximum distance between the end of the boss 220 and the abutting surface 211 is smaller than the maximum distance between the second surface 1113 and the abutting surface 211 . Specifically, referring to FIG. 3 , the maximum distance between the second surface 1113 of the substrate 111 and the abutment surface 211 is H, and the maximum distance between the end of the boss 220 and the abutment surface 211 is h, then H>h. With the above structure, the boss 220 of the rear case 200 can well protect the substrate 111 and the electroluminescent ink layer 113 of the cover 110 , and the mobile terminal 10 can obtain a better appearance. In other implementation manners, the rear case 200 may also be made of materials such as ceramics, glass or plastic.

Referring to Fig. 5, in one embodiment, the electroluminescent ink layer 113 comprises a first monolayer 1131 and a second monolayer 1133, the first monolayer 1131 is disposed on the first surface 1111, and the inner edge of the first monolayer 1131 The window area 300 is defined, and the orthographic projection of the first single layer 1131 on the display screen 120 blocks all the non-display area 123 . The second single layer 1133 is disposed on the side of the first single layer 1131 facing the display screen 120. The first single layer 1131 can emit light of the first color when energized, and the second single layer 1133 can emit light of the second color when energized. Light. Specifically, in one embodiment, the electroluminescent ink layer 113 is printed on the first surface 1111 of the substrate 111 by printing. During the printing process, the first single layer 1131 is printed first, and then the second single layer 1133 is printed. In one embodiment, the transparency of the first single layer 1131 is higher than that of the second single layer 1133 , and the transparency of the second single layer 1133 is lower, so that the non-display area 123 can be better shielded. The above setting can not only realize the hiding of the non-display area 123 , but also enable the light emitted by the second single layer 1133 to be observed by the user through the first single layer 1131 , so as to improve the decoration effect of the mobile terminal 10 .

In one embodiment, the width of the first single layer 1131 is greater than the width of the second single layer 1133, that is, when the second single layer 1133 is printed, the inner edge of the second single layer 1133 is biased away from the center of the window area 300. shift. Further, in an embodiment, the distance between the orthographic projection of the inner edge of the first single layer 1131 on the display screen 120 and the orthographic projection of the inner edge of the second single layer 1133 on the display screen 120 is less than 0.15 mm. The above setting is beneficial to the processing of the second single layer 1133, and can prevent the inner edge of the second single layer 1133 from exceeding the inner edge of the first single layer 1131 during the printing process, so as to avoid the appearance of the second single layer 1133 on the display screen 120. Negative Effects. It can be understood that the number of the first single layer 1131 can be multiple layers, and the number of the second single layer 1133 can also be multiple layers.

In one embodiment, the first single layer 1131 can emit light of a first color when electrified, and the second single layer 1133 can emit light of a second color when electrified. Specifically, in one embodiment, the first color is light green, and the second color is light blue. The first single layer 1131 and the second single layer 1133 can be energized separately, so that the electroluminescent ink layer 113 only emits light of one color. In other implementation manners, the first single layer 1131 and the second single layer 1133 may also be energized at the same time, so that the electroluminescent ink layer 113 emits light of mixed colors. Further, in other implementation manners, the first single layer 1131 can also be configured to emit light of various colors. In one embodiment, the electroluminescent ink layer 113 can display patterns by controlling the distribution of the electroluminescent ink layer 113 on the first surface 1111 , so as to further enhance the decorative effect of the display screen 120 .

In one embodiment, the substrate 111 is flat glass, and the processing cost of the flat glass is low, and the flat substrate 111 facilitates the processing of the electroluminescent ink layer 113 . Referring to FIG. 6 and FIG. 7 , in another embodiment, the substrate 111 may be curved glass, such as 2.5D glass or 3D glass. By disposing the electroluminescent ink layer 113 on the side of the curved glass facing the display screen 120 , the black border around the display screen 120 can be effectively blocked, and the mobile terminal 10 can obtain a better appearance.

8 and 9, in one embodiment, the cover plate 110 may further include a reflective layer 115, the reflective layer 115 is disposed on the periphery of the window area 300, and the reflective layer 115 is connected to the electroluminescent ink layer 113, the reflective layer 115 It is used to prevent the light emitted from the display screen 120 from passing through the electroluminescence ink layer 113 . In one embodiment, the reflective layer 115 is a silver reflective layer. Specifically, in one embodiment, the reflective layer 115 includes multiple silver atomic layers, the reflective layer 115 has a relatively high reflectivity, and the light emitted from the display area 121 to the reflective layer 115 is specularly reflected on the reflective layer 115, This part of the light is reflected toward the display area 121 or the window area 300 and does not pass through the electroluminescent ink layer 113 , thus avoiding bright edges on the inner edge of the electroluminescent ink layer 113 close to the display area 121 . The reflective layer 115 can also prevent the light emitted by the electroluminescent ink layer 113 from irradiating the display area 121 of the display screen 120 , so as to prevent the light emitted by the electroluminescent ink layer 113 from adversely affecting the display of the display screen 120 . It can be understood that the thickness of the reflective layer 115 can be made extremely thin, for example, when the reflective layer 115 is a silver reflective layer 115, the thickness of the reflective layer 115 is almost invisible visually. It can be understood that the reflective layer 115 can also be made of other high reflectivity materials. It can be understood that the reflective layer 115 is not necessary. For example, the area near the window area 300 of the electroluminescent ink layer 113 can be made non-luminous, and the transparency of this part of the area is low, so that the electroluminescent ink layer can be prevented from The light emitted from 113 is incident on the display area 121 , which also prevents the light emitted from the display area 121 from passing through the electroluminescent ink layer 113 .

In one embodiment, the orthographic projection of the inner edge of the reflective layer 115 on the display screen 120 is located within the display area 121, and the reflective layer 115 can block some of the pixels of the display area 121, and these blocked pixels may not be used. to display. The above arrangement can ensure the reflective effect of the reflective layer 115 on the edge of the display area 121 , and prevent the non-display area 123 from being exposed and generating black borders due to installation errors of the cover plate 110 . In another embodiment, the orthographic projection of the inner edge of the reflective layer 115 on the display screen 120 coincides with the edge of the display area 121 , thus ensuring that the display area 121 of the display screen 120 is fully utilized.

Referring to FIG. 10 , in an embodiment, the reflective layer 115 may be in a stepped shape, that is, the reflective layer 115 extends from the display area 121 to the non-display area 123 and is in a stepped shape. The reflective layer 115 has a reflective surface 116 , which may be a plane, and the reflective surface 116 may be perpendicular to or parallel to the display screen 120 . In the embodiment shown in FIG. 10 , the reflective surface 116 includes a first reflective surface 1161, a second reflective surface 1163 and a third reflective surface 1165, the first reflective surface 1161 and the third reflective surface 1165 are perpendicular to the display screen 120, and the second The two reflective surfaces 1163 are parallel to the display screen 120 . The light emitted from the display area 121 to the reflective layer 115 produces specular reflection on the first reflective surface 1161, the second reflective surface 1163 and the third reflective surface 1165, and the light will not pass through the electroluminescent ink layer 113, thus preventing The inner edge of the electroluminescent ink layer 113 produces a bright edge phenomenon. It can be understood that it is not necessary that the first reflective surface 1161 and the second reflective surface 1163 be perpendicular to the display screen 120 , nor is it necessary that the second reflective surface 1163 be parallel to the display screen 120 .

Further, referring to FIG. 11 , in one embodiment, the reflective surface 116 of the reflective layer 115 is flat, and the reflective surface 116 is inclined toward the display area 121 , and the angle between the reflective surface 116 and the display screen 120 is an acute angle. The reflective surface 116 has a simple structure and is easy to process. The function of the reflective layer 115 is that it can prevent the light emitted from the display screen 120 from passing through the electroluminescent ink layer 113, thereby avoiding the occurrence of bright edges near the inner edge of the display area 121 of the electroluminescent ink layer 113. Above, the reflective surface 116 of the reflective layer 115 can be deformed in many ways, which will not be repeated here.

Referring to FIG. 12 and FIG. 13 , in one embodiment, the cover plate 110 may further include a shading member 117 , the shading member 117 is disposed on the side of the electroluminescent ink layer 113 facing the display screen 120 , and the shading member 117 is located in the window area 300 the periphery. The shade 117 is used to prevent the light emitted by the electroluminescent ink layer 113 from entering the display area 121 of the display screen 120 . Specifically, in one embodiment, the light-shielding member 117 is made of plastic, and the light-shielding member 117 has a low light rate, which can prevent light from passing through. Referring to FIG. 12 , in one embodiment, the orthographic projection of the inner edge of the shading member 117 on the display screen 120 is within the orthographic projection of the electroluminescent ink layer 113 on the display screen 120 . Further, referring to FIG. 13 , in one embodiment, the orthographic projection of the inner edge of the light shielding member 117 on the display screen 120 coincides with the orthographic projection of the inner edge of the electroluminescent ink layer 113 on the display screen 120 . In other implementation manners, the material of the shade 117 may be rubber or metal. When the electroluminescent ink layer 113 is energized to emit light, the shading member 117 can prevent the light emitted by the electroluminescent ink layer 113 from entering the display area 121 of the display screen 120, so as to prevent the light emitted by the electroluminescent ink layer 113 from striking the display screen 120. The display has an adverse effect. In one embodiment, an adhesive layer (not shown) may be disposed on the surface of the light-shielding member 117 facing the substrate 111 , and the electroluminescent ink layer 113 is fixedly connected to the light-shielding member 117 through the adhesive layer. It can be understood that the shading member 117 is not necessary. For example, the transparency of the part of the electroluminescent ink layer 113 close to the non-display area 123 can be made lower, so as to prevent the light emitted from the electroluminescent ink layer 113 from entering the display. In the region 121 , the electroluminescent ink layer 113 can also have a good shielding effect on the non-display region 123 .

The various technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (11)

1. a kind of cover board is set for covering to display screen, which is characterized in that the cover board includes：

Substrate is transparent；The substrate has the first surface towards the display screen and second backwards to the display screen Surface；And

Electroluminescent ink layer is arranged on the first surface, and the inward flange of the electroluminescent ink layer defines described The viewfinder area of substrate, and the orthographic projection of the electroluminescent ink layer on the display screen block the display screen whole it is non- Viewing area；The electroluminescent ink layer can shine when being powered.

2. cover board according to claim 1, which is characterized in that the electroluminescent ink layer includes the first individual layer and second Individual layer, first individual layer are arranged on the first surface, and the inward flange of first individual layer defines the viewfinder area, and All non-display areas are blocked in the orthographic projection of first individual layer on the display screen；Second individual layer is arranged at described The one side of the direction display screen of first individual layer；First individual layer can send the light of the first color when being powered, described Second individual layer can send the light of the second color when being powered.

3. cover board according to claim 1, which is characterized in that the inward flange of the electroluminescent ink layer is in the display Orthographic projection on screen is located in the viewing area of the display screen, and the inward flange of the electroluminescent ink layer is in the display screen On the edge of orthographic projection and the viewing area be smaller than 0.15 millimeter.

4. cover board according to claim 1, which is characterized in that further include reflecting layer, the reflecting layer is arranged at described regard The periphery in window area, and the reflecting layer is connected with the electroluminescent ink layer, the reflecting layer is used to prevent by the display The light of screen outgoing penetrates the electroluminescent ink layer.

5. cover board according to claim 4, which is characterized in that the inward flange in the reflecting layer is on the display screen just Projection and the coincident of the viewing area of the display screen.

6. cover board according to claim 4, which is characterized in that the reflecting layer is silver reflecting layer, the reflecting layer tool Have a reflecting surface, the reflecting surface is plane, the reflecting surface towards the viewing area of the display screen, and the reflecting surface with it is described The angle of display screen is acute angle.

7. cover board according to claim 1, which is characterized in that further include shading piece, the shading piece is arranged at the electricity The one side of the direction display screen of photoluminescence ink layer, and the shading piece is located at the periphery of the viewfinder area；The shading Part is used for the viewing area that light that the electroluminescent ink layer is sent is prevented to be incident to the display screen.

8. cover board according to claim 7, which is characterized in that the inward flange of the shading piece is on the display screen just The orthographic projection with the inward flange of the electroluminescent ink layer on the display screen is projected to overlap.

9. a kind of display module, which is characterized in that including display screen and claim 1~8 any one of them cover board, the lid Plate is covered on the display screen.

10. a kind of mobile terminal, which is characterized in that including the display module described in rear shell and claim 9, the display screen is extremely Small part is contained in the rear shell, and the cover board is fixedly connected with the rear shell.

11. mobile terminal according to claim 10, which is characterized in that the rear shell include body and boss, described Body and the boss are integrally formed, and the cover board is connected on the body；The body has supporting surface, the end of the boss Maximum range between end and the supporting surface is less than the maximum range between the second surface and the supporting surface.