CN111294435A

CN111294435A - Mobile terminal

Info

Publication number: CN111294435A
Application number: CN202010113747.3A
Authority: CN
Inventors: 贾玉虎
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-02-24
Filing date: 2020-02-24
Publication date: 2020-06-16
Anticipated expiration: 2040-02-24
Also published as: CN111294435B

Abstract

The invention provides a mobile terminal. A mobile terminal comprises a middle frame, a cover plate, a display module and a light sensing device. The cover plate and the display module are arranged in the middle frame in a stacked mode, the display module is arranged on the inner side of the cover plate, the cover plate and the display module form a light-transmitting channel used for transmitting ambient light, and the light sensing device is arranged in the light-transmitting channel and used for sensing the ambient light. The light transmission channel is provided with a total reflection structure at the projection position of the inner side surface of the cover plate, and display light rays emitted by the display module are totally reflected out of the outer side of the cover plate through the total reflection structure. When the mobile terminal can adjust the brightness of the display module according to the ambient light, the increase of the power consumption of the processor can be avoided, and the processor is prevented from being jammed.

Description

Mobile terminal

Technical Field

The present disclosure relates to electronic devices, and more particularly, to a mobile terminal.

Background

At present, all mobile terminals have the function of automatically adjusting the brightness of backlight by ambient light. The brightness of the screen is improved in the daytime, so that the screen can be seen more clearly; the screen brightness is reduced at night so that the screen looks not dazzling.

Referring to fig. 1, the brightness of the display module 12a of the conventional mobile terminal is adjusted mostly by placing the optical sensor 13a between the middle frame 11a and the display module 12 a. The ambient light 30a enters the photo sensor 13a through the display module 12a, and the internal light 20a of the display module 12a is reflected by the cover plate 10a and penetrates through the display module 12a again to enter the photo sensor 13a, so the actual transmittance is low and the interference to the photo sensor 13a is small. The traditional mobile phone needs to adjust the brightness of the display module 12a by capturing the brightness of the display screen and then performing operation and comparison through the processor. According to the scheme, screen capture needs to be carried out continuously, the power consumption of the whole machine is increased, and a processor is blocked easily.

Disclosure of Invention

The purpose of the present disclosure is to provide a mobile terminal capable of adjusting the brightness of a display module according to ambient light, avoiding increasing the power consumption of a processor, and preventing the processor from being jammed.

A mobile terminal comprises a middle frame, a cover plate, a display module and a light sensing device, wherein the cover plate and the display module are arranged in the middle frame in a stacking mode, the display module is arranged on the inner side of the cover plate, the cover plate and the display module form a light transmitting channel used for transmitting ambient light, and the light sensing device is arranged in the light transmitting channel and used for sensing the ambient light;

the light-transmitting channel is provided with a total reflection structure at the projection position of the inner side surface of the cover plate, and display light rays emitted by the display module are totally reflected out of the outer side of the cover plate through the total reflection structure.

The light sensation device can receive the ambient light directly entering from the light transmission channel, and the backlight brightness of the display module of the mobile terminal is correspondingly adjusted according to the light intensity of the sensed ambient light. Therefore, the mobile terminal does not need to continuously capture the screen, and the processor is prevented from being blocked.

And, the mobile terminal, through setting up the total reflection structure on the apron, the total reflection structure is used for going out the interference light reflection that throws on it. The interference light rays are not refracted to the light sensing device, so that the interference light rays cannot interfere the sensing result of the light sensing device on the ambient light rays. Therefore, the mobile terminal can also ensure that the light sensation device can accurately adjust the brightness of the display module according to the light intensity of the ambient light under the condition of meeting the design requirement of the narrow frame.

Drawings

Fig. 1 is a schematic structural diagram of a conventional mobile terminal;

fig. 2 is a schematic structural diagram of another conventional mobile terminal;

fig. 3 is a schematic structural diagram of a mobile terminal according to an embodiment of the present disclosure;

fig. 4 is a partial enlarged view of the mobile terminal according to fig. 3;

fig. 5 is a schematic diagram of the total reflection structure shown in fig. 3.

Detailed Description

While this invention is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present description is to be considered as an exemplification of the principles of the disclosure and is not intended to limit the invention to that as illustrated herein.

Thus, a feature indicated in this specification will serve to explain one feature of an embodiment of the disclosure, and not to imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.

In the embodiments shown in the drawings, directional references (such as upper, lower, left, right, front and rear) are used to explain the structure and movement of the various elements of the invention not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

The preferred embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

The present embodiment provides a mobile terminal. The mobile terminal can be a common mobile terminal such as a mobile phone and a tablet computer, and is provided with a light sensing device for sensing external ambient light. And the backlight intensity of the mobile terminal can be adjusted according to the ambient light from the outside, and the like.

In the conventional solution, as shown in fig. 2, the light sensing device 13 may also be disposed at an edge position of the mobile terminal, and a light-transmitting region 102 is required to be disposed at an edge position of the cover 10 of the mobile terminal so that the light sensing device senses the external ambient light 30. The ink area 101 of the screen frame of the conventional mobile terminal is mostly over 6mm, and the width is enough to open the light-transmitting area 102 large enough to transmit the ambient light 30 with enough intensity. The light sensor 13 can accurately sense the intensity of the external ambient light 30, so as to accurately control the backlight brightness of the display module 12.

However, with the narrow border design of the mobile terminal, the ink area 101 of the screen border of the mobile terminal is made narrower and narrower. With the narrowing of the frame, the aperture of the transparent area 102 becomes smaller and smaller, and the distance between the display module 12 and the transparent area 102 also decreases. Therefore, the light inside the display module 12 enters the light sensor 13 through the transparent area 102, which interferes with the ambient light 30, and affects the brightness of the display module 12 to be accurately adjusted according to the change of the ambient light 30.

Referring to fig. 3 and 4, in the present embodiment, a mobile terminal includes a cover plate 10, a middle frame 11, a display module 12 and a light sensor 13. The cover plate 10 and the display module 12 are stacked in the middle frame 11. The display module is disposed inside the cover plate 10. The cover plate 10 and the display module 12 form a light-transmitting channel 15 for transmitting ambient light 30. The light sensor 13 is disposed in the light-transmitting channel 15 and is used for sensing the ambient light 30.

The light sensor 13 can receive the ambient light 30 directly entering from the light-transmitting channel 15, and the backlight brightness of the display module 12 of the mobile terminal is correspondingly adjusted according to the light intensity of the sensed ambient light 30. Therefore, the mobile terminal does not need to continuously capture the screen, and the processor is prevented from being blocked.

The cover plate 10 is located at the outermost side of the mobile terminal and can be touched by fingers. Specifically, in the present embodiment, the cover plate 10 is a transparent cover plate 10. The transparent cover 10 is used for encapsulating the display module 12. The cover plate 10 may be a glass cover plate, a resin cover plate, a plastic cover plate, or the like, for example, a glass cover plate is used. And, the cover plate 10 has a rectangular shape. For convenience of illustration, the two short sides of the cover plate 10 correspond to the two ends of the mobile terminal, and the two long sides correspond to the two sides of the mobile terminal.

When the cover plate 10 is fixedly installed, the outer edge of the cover plate 10 protrudes to the outside of the display module 12 and is overlapped on the middle frame 11. The middle frame 11 is provided with a step 111 for overlapping the edge of the cover plate 10. The step 111 ensures that the cover plate 10 can be stably disposed on the middle frame 11. The middle frame 11 is annular, and the step portion 111 is also annular. Four edges of the cover plate 10 are all overlapped on the step part 111.

The cover plate 10 is provided with an ink region 101 and a light-transmitting region 102. The ink region 101 surrounds the light-transmitting region 102, and the light-transmitting region 102 is located in the middle of the ink region 101.

Specifically, in the present embodiment, the ink area 101 is disposed at the peripheral edge of the cover plate 10, and correspondingly forms the frame of the mobile terminal. The ink area 101 is provided with an ink layer. The ink layer is disposed on the surface of the cover plate 10 near the display module 12. The ink layer is used for shielding electronic elements or wiring arrangement arranged around the cover plate 10.

The transparent region 102 is used for the incident ambient light 30. The light-transmitting region 102 is a light-incident portion of the light-transmitting channel 15. Ambient light 30 first impinges on cover 10 and is transmitted out of cover 10 through light-transmitting region 102.

The display module 12 is used for displaying images and emitting display light. The display module 12 may be a liquid crystal display module 12, or may also be an Organic Light-Emitting Diode (OLED) display module 12. The display module 12 is disposed on one side of the cover plate 10 and connected to the cover plate through an optical adhesive layer 14. The optical cement layer 14 may be an oca (optical clear adhesive) optical cement layer. The OCA optical cement is used for cementing special adhesives of transparent optical elements (such as lenses and the like). The OCA optical adhesive has the characteristics of colorless transparency, light transmittance of over 90 percent, good bonding strength, capability of being cured at room temperature or middle temperature, small curing shrinkage and the like.

Specifically, in the present embodiment, a gap 16 is provided between the end of the display module 12 and the side wall of the middle frame 11. The gap 16 is disposed opposite to the light-transmitting region 102 of the cover plate 10. Ambient light 30 thus passes through the transparent region 102 and exits the cover 10 directly into the void 16. Therefore, the light-transmitting channel 15 includes the light-transmitting region 102 and the space in which the gap 16 is located. It will be appreciated that the shape of the light-transmitting channel 15 is adapted to the shape of the light-transmitting region 102. It will be appreciated that the cross-section of the light-transmitting channel 15 may be square, circular, oval or the like.

It is understood that in other embodiments, the display module 12 may also be provided with a hollow portion. The hollowed-out portion may be disposed right opposite to the light-transmitting area 102 of the cover plate 10. Similarly, the ambient light 30 can enter the hollow portion after passing through the light-transmitting region 102. Therefore, the light-transmitting channel 15 includes the light-transmitting region 102 and the light channel formed by the hollow portion.

Specifically, in the present embodiment, the display module 12 includes a polarizing layer 121, a display layer 122, and a buffer layer 123. The polarizing layer 121 may be a polarizer, and the buffer layer 123 may be a foam layer.

The display layer 122 includes a light emitting region 124. The light emitting region 124 can emit light through the organic light emitting diode and enter the human eye through the polarizing layer 121, the optical adhesive layer 14 and the cover plate 10. As shown in fig. 2, 21 is a critical total reflection ray, and the incident angle of the total reflection ray 21 is a total reflection angle. When the display light 2020 enters the gap 16 between the display module 12 and the middle frame 11 through the cover 10, the incident angle of the display light 20 incident on the cover 10 is the incident angle 1. When the incident angle 1 is larger than the total reflection angle, the display light 20 is totally reflected at the exit interface inside the cover plate 10, and the display light 20 is not emitted. When the angle of incidence 1 is less than the angle of total reflection, the display light 20 will be refracted into the light-transmitting channel 15. The display light 20 refracted into the light-transmitting channel 15 interferes with the ambient light 30, and for convenience of description, the portion of the display light 20 refracted into the light-transmitting channel 15 is referred to as an interference light 22. The disturbing light 22, if projected onto the light sensor 13, disturbs the sensing result of the light sensor 13.

Specifically, in the present embodiment, the light-transmitting channel 15 is provided with a total reflection structure 103 at a projection position of the inner side surface of the cover plate 10. The total reflection structures 103 are used to reflect the disturbance light rays 22 projected thereon. The disturbing light 22 is totally reflected by the total reflection structure 103, and the propagation direction of the disturbing light 22 is changed. Therefore, the disturbing light 22 is not refracted onto the light sensing device 13, and the incident angle of the ambient light 30 is smaller than the total reflection angle, the ambient light 30 can be projected onto the light sensing device 13, so that the disturbing light 22 does not disturb the sensing result of the light sensing device 13 on the ambient light 30.

Specifically, the total reflection structures 103 may be multiple and arranged in an array. It is understood that the total reflection structure 103 may be printed in the light transmission region 102 through a printing process. The plurality of total reflection structures 103 may be completely distributed within the transparent region 102, so as to ensure that the interference light 22 passing through the transparent region 102 can be reflected by the total reflection structures 103.

The total reflection structure 103 is saw-toothed. The total reflection structure 103 includes a total reflection surface 104. The total reflection surface 104 is disposed back to the display module 12, so that the incident angle 2 of the interference light 22 projected on the total reflection structure 103 is larger than the total reflection angle. The total reflection surface 104 can increase the incident angle 2 of the disturbing light ray 22 relative to the air, so that the incident angle 2 of the disturbing light ray 22 is larger than the total reflection angle, and the disturbing light ray 22 is totally reflected out without interfering the ambient light ray 30 in the light transmission channel 15. The incident angle of the ambient light 30 is less than the total reflection angle and is not affected.

Referring to fig. 5, the cross section of the total reflection structure 103 is a right triangle. The total reflection surface 104 is an inclined surface of the right triangle. The total reflection structure 103 with the right-angled triangle cross section is convenient to manufacture and form. And the projection area of the total reflection surface 104 on the plane of the cover plate 10 is the effective reflection area of the total reflection surface 104. When the cross section of the total reflection structure 103 is a right triangle, the effective reflection area of the total reflection surface 104 is not smaller than the area of the light transmission region 102, so as to ensure the effective reflection area of the total reflection surface 104. Specifically, referring to fig. 5, fig. 5 is a schematic cross-sectional view of the total reflection structure 103, wherein the width of the effective reflection surface of the total reflection structure 103 is the width of the right-angle surface 105, and the side surface of the total reflection structure 103 where light leakage may occur is the right-angle surface 106.

Moreover, for the total reflection structure 103, an included angle between the total reflection surface 104 and the plane of the display module 12 is an acute angle c. If the disturbing light ray 22 is transmitted to the right-angled surface 106 of the total reflection structure 103, the disturbing light ray 22 still passes through the total reflection structure 103 and is incident on the light-sensing device 13, and the disturbing light ray 22 leaks out from the right-angled surface 106 side. The smaller the angle of the acute angle c, the smaller the probability that the disturbing light ray 22 passes through the total reflection structure 103, the better the total reflection effect of the total reflection structure 103.

Specifically, in the present embodiment, the smaller the minimum acute angle c of the total reflection structure 103, the smaller the angle of the incident angle 1d is b1, the larger the angle of the incident angle 2 after adding the microstructure is b2, and the smaller the angle of the total reflection angle is a, which is generally about 43 ° with respect to the structure of the display module 12. The following relationship may be specifically satisfied:

c＝180-(90-b2)-(90+b1)＝a-b1；

therefore, when b1 is larger, c is smaller, the effective reflection width of the total reflection structure 103 is longer, and the total reflection effect is better. B1 is related to the thickness of the cover plate 10 and the distance between the light emitting region 124 of the display module 12 and the total reflection structure 103.

When the mobile terminal is specifically manufactured, the light sensing device 13 can be selected to have a small size, so that the size of the space occupied by the light sensing device 13 is reduced, the width of a light sensing channel can be reduced as much as possible, and the narrow frame design is facilitated.

The middle frame 11 is provided with a groove 112 for accommodating the light sensor 13. The light-sensing device 13 is disposed in the groove 112. The groove 112 protects the side of the light-sensing device 13 from interfering light rays 22 projected from one side of the light-sensing device 13. Also, the groove 112 may increase the distance between the light-sensing device 13 and the cover plate 10. On one hand, the distance between the light sensing device 13 and the cover plate 10 is increased, and the use requirement of the light sensing device 13 is met; on the other hand, the interference light passing through the total reflection structure 103 can be projected onto the light sensing device 13 as little as possible, so as to reduce the influence of the interference light on the light sensing device 13, and the narrow frame design is facilitated.

The light sensing side of the light sensing device 13 faces the cover plate 10, and the ambient light 30 is irradiated into the light sensing device 13 through the cover plate 10. The light sensing device 13 collects light intensity information of the ambient light 30 and sends the light intensity information to the processor, and the processor controls the display module 12 according to the light intensity information and adjusts the brightness of the display module 12. For the liquid crystal display module 12, correspondingly adjusting the backlight brightness of the display module 12; for the OLED display module, the luminance of the organic light emitting diode of the display module 12 is correspondingly adjusted.

Therefore, the mobile terminal reduces the influence of the internal display light 20 of the display module 12 on the ambient light 30 by disposing the total reflection structure 103 on the cover plate 10. Above-mentioned mobile terminal also can guarantee that light sense device 13 can be accurate according to the light intensity of ambient light 30 under the design requirement that satisfies narrow frame, and the luminance of control regulation display module 12.

While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A mobile terminal is characterized by comprising a middle frame, a cover plate, a display module and a light sensation device, wherein the cover plate and the display module are stacked in the middle frame, the display module is arranged on the inner side of the cover plate, the cover plate and the display module form a light transmission channel for transmitting ambient light, and the light sensation device is arranged in the light transmission channel and used for sensing the ambient light;

2. The mobile terminal according to claim 1, wherein the total reflection structure is plural and arranged in an array.

3. The mobile terminal of claim 1, wherein the total reflection structure is saw-toothed, and the total reflection structure comprises a total reflection surface facing away from the display module, so that an incident angle of the display light projected onto the saw-toothed portion is larger than a total reflection angle.

4. The mobile terminal according to claim 3, wherein an included angle between the total reflection surface and a plane where the display module is located is an acute angle.

5. The mobile terminal according to claim 3, wherein the cross section of the total reflection structure is a right triangle, and the total reflection surface is an inclined surface.

6. The mobile terminal of claim 1, wherein the middle frame defines a groove for receiving the light sensor, and the light sensor is disposed in the groove.

7. The mobile terminal of claim 1, wherein the cover plate is provided with an ink area and a light-transmissive area, the ink area surrounding the light-transmissive area, the light-transmissive channel including the light-transmissive area.

8. The mobile terminal according to claim 1, wherein the middle frame is provided with a side wall, the side wall is provided with a step portion, and an outer edge of the cover plate is overlapped on the step portion.

9. The mobile terminal of claim 8, wherein a gap exists between an end of the display module and a sidewall of the middle frame, and the ambient light is projected onto the light-sensing device through the gap.

10. The mobile terminal according to any of claims 1-9, wherein the display module is an organic light emitting diode display module.