TWI603225B - Viewing angle adjusting method and apparatus of liquid crystal display - Google Patents

Description

Method and device for adjusting viewing angle of liquid crystal display

The present invention relates to the field of data processing technology, and in particular, to a method, device and system for adjusting a viewing angle of a liquid crystal display (LCD).

Liquid crystal displays are widely used in daily life, and today's smart phones and tablets use a wide viewing angle liquid crystal display as a display device. Among them, the viewing angle of the wide viewing angle liquid crystal display is fixed. If the user uses the mobile phone or the tablet computer in public, the surrounding person can see that the user is using the display content of the liquid crystal display in the mobile phone or the tablet computer, so that the privacy of the user is leaked. .

In order to solve the problem of user privacy leakage, the prior art adopts a display device that directly uses a narrow-angle liquid crystal display as a smart phone and a tablet computer, and the user must use the smart phone or the tablet computer to have the eyes at a specific angle, that is, The content in the screen can be seen in a narrow viewing angle of the liquid crystal display, resulting in a user's poor visual experience and uncomfortable use experience.

The invention provides a method, a device and a system for adjusting a display angle of a liquid crystal display, which can improve the user's visual experience and use experience while avoiding leakage of user privacy.

The present invention provides a method for adjusting the viewing angle of a liquid crystal display, comprising: (b) acquiring a picture including a user's pupil position information; and (c) acquiring an offset information of the user's pupil relative to a center of the liquid crystal display according to the foregoing picture; (d) obtaining a current tilt angle information of one of the liquid crystal displays; and (e) adjusting a display angle of the liquid crystal display according to the current tilt angle information of the liquid crystal display and the offset information of the user pupil relative to the center of the liquid crystal display .

According to a preferred embodiment, before (b) obtaining a picture including a user's pupil position information, the method further includes: (a-1) identifying a user pupil; and (a-2) positioning the user pupil.

According to a preferred embodiment, the foregoing (c) acquires an offset information of the user's pupil relative to a center of the liquid crystal display according to the foregoing picture, including: (c-1) dividing the picture into four quadrants; (c-2) Obtaining a quadrant of the user's pupil according to the user's pupil position information; (c-3) obtaining a distance from the user's pupil to the center of the liquid crystal display; and (c-4) obtaining the user's pupil relative according to the aforementioned quadrant and the aforementioned distance Offset information in the center of the LCD display.

According to a preferred embodiment, the foregoing (d) obtaining current tilt information of the liquid crystal display includes: (d-1) predetermining a stereo coordinate axis, wherein the stereo coordinate axis includes three mutually perpendicular coordinate axes; (d-2) Obtaining gravity data of the liquid crystal display along the three coordinate axes respectively; and (d-3) acquiring current tilt information of the liquid crystal display according to the gravity data, wherein the current tilt information includes an angle information between the liquid crystal display and three coordinate axes .

According to a preferred embodiment, the current tilt angle information of the (e) liquid crystal display and the offset information of the user's pupil relative to the center of the liquid crystal display are adjusted to adjust the liquid crystal display. The display viewing angle of the display comprises: (e-1) determining the visual angle of view of the user pupil according to the offset information of the user's pupil relative to the center of the liquid crystal display; and (e-2) adjusting the foregoing according to the current tilt information of the liquid crystal display The viewing angle of the liquid crystal display is such that the user's pupil visual viewing angle is satisfied.

The present invention provides a device for adjusting the viewing angle of a liquid crystal display. The device includes: a first acquiring module, configured to acquire a picture including a user's pupil position information; and a second acquiring module, configured to acquire the user's pupil according to the foregoing picture The offset information of the center of the liquid crystal display; the third obtaining module is configured to obtain the current tilting information of the liquid crystal display; and the adjusting module is configured to: according to the current tilting information of the liquid crystal display and the bias of the user's pupil relative to the center of the liquid crystal display Move the information to adjust the display angle of the aforementioned liquid crystal display.

According to a preferred embodiment, the adjustment device further includes: an identification module for identifying a user pupil in the image; and a positioning module, configured to: after the identification module completes the identification of the user's pupil The user's pupil is positioned to obtain the aforementioned user pupil position information.

According to a preferred embodiment, the second acquiring module further includes: a dividing sub-module, configured to divide the image into four quadrants; and the first determining sub-module is configured to determine, according to the user pupil position information, a quadrant in which the user's pupil is located; a first acquisition sub-module configured to acquire a distance from the user's pupil to a center of the liquid crystal display; and a second acquisition sub-module configured to acquire the pupil relative to the liquid crystal according to the quadrant and the distance Offset information in the center of the display.

According to a preferred embodiment, the third acquiring module further includes: a second determining sub-module, configured to predetermine a three-dimensional coordinate axis, the three-dimensional coordinate axis includes three mutually perpendicular coordinate axes; and the third acquiring sub-module a group for respectively acquiring gravity data of the liquid crystal display along three coordinate axes; and a fourth acquiring sub-module for obtaining the gravity data according to the foregoing Taking the current tilt information of the liquid crystal display, the current tilt information includes the angle information of the liquid crystal display and the three coordinate axes.

According to a preferred embodiment, the adjustment module further includes: a third determining sub-module, configured to determine a visible viewing angle of the user pupil according to the offset information of the user's pupil relative to the center of the liquid crystal display; and adjust the sub-module, And used to adjust the display viewing angle of the liquid crystal display according to the current tilt information of the liquid crystal display to meet the aforementioned user pupil visual viewing angle.

The invention provides an adjustment system for displaying a viewing angle of a liquid crystal display, wherein the adjustment system comprises a front camera, a gravity sensor and a processor; the front camera is configured to acquire a picture including information of a user's pupil position, and transmit the image to the processor. The processor is configured to obtain offset information of the user's pupil relative to the center of the liquid crystal display according to the foregoing picture; the gravity sensor is configured to acquire current tilt information of the liquid crystal display, and transmit the information to the processor; and the processor is used according to the foregoing Adjusting the viewing angle of the liquid crystal display by adjusting the current tilt information of the liquid crystal display and the offset information of the user's pupil relative to the center of the liquid crystal display.

The invention first obtains a picture including the user's pupil position information, and obtains the offset information of the user's pupil position according to the foregoing picture; secondly, obtains the current tilt information of the liquid crystal display; finally, according to the current tilt information of the liquid crystal display and the user The offset information of the pupil position is adjusted to adjust the display angle of the liquid crystal display. In the invention, the smart phone or the tablet computer with the liquid crystal display can automatically adjust the display angle of the liquid crystal display according to the information acquired by the gravity sensor and the information of the pupil position of the recognized user, so that the user can experience the best visual experience. . Since the viewing angle of the liquid crystal display automatically changes according to the position change of the user's pupil, the current liquid crystal display is a wide viewing angle liquid crystal display for the user, and the liquid crystal display has a narrow viewing angle for the person around the user. People around the user can not see the contents of the screen because of the narrow viewing angle, which effectively protects the user's privacy.

401‧‧‧First acquisition module

402‧‧‧Second acquisition module

403‧‧‧ third acquisition module

404‧‧‧Adjustment module

501‧‧‧front camera

502‧‧‧ processor

503‧‧‧Gravity sensor

Step 101‧‧‧Get a picture that includes information about the user's pupil position

Step 102‧‧‧Get the offset information of the user's pupil relative to the center of the LCD display

Step 103‧‧‧Get the current tilt information of the LCD display

Step 104‧‧‧Adjust the display angle of the liquid crystal display

Step 301‧‧‧ Front camera captures images including user pupil position information

Step 302‧‧‧Get the offset information of the user's pupil relative to the mobile phone screen center

Step 303‧‧‧ Gravity sensor obtains the current dip information of the mobile phone screen

Step 304‧‧‧ Processor adjusts the display angle of the mobile phone screen

FIG. 1 is a flow chart showing a method for adjusting a viewing angle of a liquid crystal display device according to Embodiment 1 of the present invention.

Fig. 2 is a schematic view showing the liquid crystal display device of the first embodiment of the present invention in a different tilt state.

FIG. 3 is a flow chart of a method for adjusting a display angle of a mobile phone screen according to Embodiment 2 of the present invention.

Fig. 4 is a structural view showing an apparatus for adjusting a viewing angle of a liquid crystal display device according to a third embodiment of the present invention.

Fig. 5 is a structural diagram showing an adjustment system for viewing angle of a liquid crystal display device according to a third embodiment of the present invention.

The present invention discloses a method, apparatus and system for adjusting the viewing angle of a liquid crystal display. Some of the circuit component configurations utilized in the embodiments of the present invention are achieved using the prior art and are not fully described in the following description. In addition, the drawings in the following texts are not completely drawn in accordance with actual relevant dimensions, and their function is only to show a schematic diagram relating to the features of the present invention.

First, please refer to FIG. 1 , which is a flowchart of a method for adjusting a viewing angle of a liquid crystal display according to a first embodiment of the present invention. The flow is as follows: Step 101: Acquire a picture including the user's pupil position information. In this embodiment, before adjusting the liquid crystal display display angle, the picture including the user's pupil position information is first acquired. Specifically, the embodiment may first identify the user's pupil, and secondly, locate the user's pupil, and finally, obtain a picture including the user's pupil position information. In a practical application, a smart phone or a tablet computer with a liquid crystal display has a front camera. In this embodiment, the front camera of the smart phone or the tablet computer can be used to identify the user's pupil, and then the user can be positioned to obtain the user. A picture of the pupil position information. In actual operation, the embodiment can use the front camera of the smart phone or the tablet to obtain image information located in front of the liquid crystal display, that is, the face detection can be performed first. And identification, and secondly, searching for the user's pupil position information in the recognized face area. Specific user pupil detection can be achieved using grayscale projection or geometric feature methods.

Step 102: Obtain offset information of the user's pupil relative to the center of the liquid crystal display. In this embodiment, after acquiring the image including the user's pupil position information, the offset information of the user's pupil relative to the center of the liquid crystal display may be obtained according to the foregoing picture. In the actual operation, the acquired picture may be first divided into four quadrants; secondly, according to the user's pupil position information, the quadrant of the user's pupil is determined; and again, the distance from the user's pupil to the center of the liquid crystal display is obtained; finally, according to the foregoing The quadrant and the aforementioned distance obtain the offset information of the user's pupil relative to the center of the liquid crystal display. Specifically, in this embodiment, the center line in the up and down direction of the picture and the center line in the left and right direction are used as the dividing line, and the foregoing picture is divided into four quadrants to determine the quadrant where the user's pupil is located, and at the same time, the user can obtain the pupil to the liquid crystal. The distance of the display, and finally based on the user's pupil position information and the aforementioned distance, determine the offset information of the user's pupil relative to the center of the liquid crystal display. The offset information of the user's pupil relative to the center of the liquid crystal display may be an offset angle with a center point of the image as a reference point.

Step 103: Obtain the current tilt information of the liquid crystal display; when the user uses the smart phone or the tablet, the liquid crystal display of the smart phone and the tablet may be in different tilt states. In this embodiment, the current tilt information of the liquid crystal display is also required. . The current tilt information of the liquid crystal display can indicate the tilt state of the liquid crystal display, and the viewing angle of the liquid crystal display can be accurately adjusted only considering the tilt state of the liquid crystal display. In actual operation, the three-dimensional coordinate axis may be first determined, the three-dimensional coordinate axis includes three mutually perpendicular coordinate axes; secondly, the gravity data of the liquid crystal display along the three coordinate axes are respectively acquired; finally, the liquid crystal is obtained according to the gravity data. The current tilt information of the display, the current tilt information includes the angle information of the liquid crystal display and the three coordinate axes.

Please refer to FIG. 2 together for a schematic diagram in which the liquid crystal display is in a different tilt state. As shown in Figure 2, +X, +Y, and +Z are three mutually perpendicular axes. Together they define a stereo axis. When the liquid crystal display is in the aforementioned three-dimensional coordinate axis, the three gravitational axes have corresponding gravity data, and the current dip information of the liquid crystal display can be determined according to the gravity data of the three coordinate axes, that is, the liquid crystal display and the three coordinate axes Angle information. It should be noted that the order of execution of step 101 and step 103 in this embodiment is not limited, and step 101 may be performed first, and then step 103 may be performed; step 103 may be performed first, then step 101 may be performed; step 101 and Step 103 is performed simultaneously.

Step 104: Adjust the display viewing angle of the liquid crystal display. In this embodiment, the display angle of view of the liquid crystal display is adjusted according to the current tilt information of the liquid crystal display obtained and the offset information of the user's pupil relative to the center of the liquid crystal display. Specifically, the viewing angle of the user pupil may be determined according to the offset information of the user's pupil relative to the center of the liquid crystal display. Secondly, according to the current tilting information of the liquid crystal display, the display viewing angle of the liquid crystal display is adjusted to meet the user's pupil. The viewing angle can be adjusted by adjusting the liquid crystal display in the liquid crystal display to cover a portion of the light emitted by the light source in the liquid crystal display, thereby changing the visible range of the liquid crystal display to achieve Display angle adjustment function.

In actual operation, in order to make the display viewing angle of the liquid crystal display meet the needs of the user, the embodiment needs to first determine the visual viewing angle of the user's pupil according to the offset information of the user's pupil relative to the center of the liquid crystal display, and secondly, according to the current tilting information of the liquid crystal display. Adjusting the display viewing angle of the liquid crystal display, so that the display viewing angle of the adjusted liquid crystal display can satisfy the user's pupil visual viewing angle, that is, the user's visual experience is ensured.

In this embodiment, the image including the user's pupil position information is first obtained, and the offset information of the user's pupil relative to the center of the liquid crystal display is obtained according to the foregoing picture; secondly, the current tilt information of the liquid crystal display is obtained; finally, according to the current tilt angle of the liquid crystal display. The information and the offset information of the user's pupil relative to the center of the liquid crystal display adjust the display angle of the liquid crystal display. In this embodiment, a smart phone equipped with a liquid crystal display Or the tablet computer can automatically adjust the display angle of the liquid crystal display according to the information acquired by the gravity sensor and the identified pupil position information, so that the user can experience the best visual experience. Since the viewing angle of the liquid crystal display automatically changes according to the position change of the user's pupil, the current liquid crystal display is a wide viewing angle liquid crystal display for the user, and the liquid crystal display has a narrow viewing angle for the person around the user. People around the user can not see the contents of the screen because of the narrow viewing angle, which effectively protects the user's privacy.

Next, please refer to FIG. 3, which is a flowchart of a method for adjusting a display angle of a mobile phone screen according to a second embodiment of the present invention. In this embodiment, a smart phone using a liquid crystal display as a screen is taken as an example to introduce how to adjust the display angle of the mobile phone screen; wherein the smart phone has a built-in gravity sensor and a front camera. The process is as follows: Step 301: The front camera acquires a picture including the user's pupil position information. In this embodiment, since the smart phone has a built-in front camera, the front camera can be used to obtain a picture including the user's pupil position information, which is currently being used. The user of the smart phone takes a photo and saves the aforementioned photo in the aforementioned smart phone.

Step 302: Obtain offset information of the user's pupil relative to the mobile phone screen center. In this embodiment, the smart phone includes a processor, and the processor in the smart phone can process the image stored in the smart phone, and finally obtain The offset information of the user's pupil relative to the center of the mobile phone screen.

Step 303: The gravity sensor obtains the current tilt information of the mobile phone screen. In this embodiment, the gravity sensor of the smart phone can obtain the current tilt information of the mobile phone screen, thereby identifying the current tilt state of the smart phone.

Step 304: The processor adjusts the display viewing angle of the mobile phone screen. In this embodiment, when the position information of the user's pupil relative to the mobile phone screen center is known, the mobile phone screen and the user's pupil can be obtained by combining the tilt position of the current smart phone. Angle information. Specifically, the processor of the smart phone can be offset from the user's pupil relative to the center of the mobile phone screen. The location information and the current dip information of the mobile phone screen adjust the display angle of the current mobile phone screen to meet the user's visual experience.

In this embodiment, a smart phone using a liquid crystal display as a mobile phone screen is taken as an example. The front camera of the smart phone first obtains a picture including the user's pupil position information, and the processor obtains the partial user's pupil relative to the mobile phone screen center according to the foregoing picture. Secondly, the gravity sensor of the smart phone acquires the current tilt information of the mobile phone screen; finally, according to the current tilt information of the aforementioned mobile phone screen and the offset information of the user's pupil relative to the mobile phone screen center, the display of the mobile phone screen is adjusted. Perspective. This embodiment can automatically adjust the display angle of the mobile phone screen to let the user experience the best visual experience. Since the angle of view of the mobile phone screen will automatically change according to the position change of the user's pupil, it is a wide-angle view of the mobile phone screen for the user, and for the people around the user, the viewing angle of the mobile phone screen is a narrow viewing angle, so the user around the user People will not be able to see the contents of the screen because of the narrow viewing angle, which effectively protects the privacy of users.

Continuing to refer to FIG. 4, which is a structural diagram of a viewing angle adjustment device for a liquid crystal display according to a first embodiment of the present invention. The adjustment device may include: a first acquisition module 401, configured to acquire a picture including user pupil position information; The second obtaining module 402 is electrically connected to the first acquiring module 401, and is configured to obtain offset information of the user's pupil relative to the center of the liquid crystal display according to the foregoing picture; the third obtaining module 403 and the second acquiring module The electrical connection is used to obtain the current tilt information of the liquid crystal display. The adjustment module 404 is electrically connected to the third acquisition module 403, and is configured to be used according to the current tilt information of the liquid crystal display and the user's pupil relative to the center of the liquid crystal display. Offset information to adjust the display angle of view of the aforementioned liquid crystal display.

The adjustment device may further include: an identification module, configured to identify a user pupil in the image; and a positioning module, configured to: after the identification module completes the identification of the user's pupil, locate the user pupil in the image to obtain The aforementioned user pupil position information.

The second obtaining module 402 may further include: a dividing sub-module, configured to divide the foregoing image into four quadrants; and the first determining sub-module, configured to determine, according to the user pupil position information, a quadrant of the user's pupil The first acquiring sub-module is configured to obtain the distance from the user's pupil to the center of the liquid crystal display; and the second acquiring sub-module is configured to obtain offset information of the user's pupil relative to the center of the liquid crystal display according to the foregoing quadrant and the foregoing distance.

The third obtaining module 403 may further include: a second determining sub-module, configured to pre-determine a three-dimensional coordinate axis, the three-dimensional coordinate axis includes three mutually perpendicular coordinate axes; and the third acquiring sub-module is configured to separately acquire The gravity data of the liquid crystal display along the three coordinate axes; and the fourth acquisition sub-module, configured to acquire current tilt information of the liquid crystal display according to the gravity data, wherein the current tilt information comprises the liquid crystal display and three coordinate axes Angle information.

The adjustment module 404 may further include: a third determining sub-module, configured to determine a visual view angle of the user pupil according to the offset information of the user's pupil relative to the center of the liquid crystal display; and an adjustment sub-module for using the liquid crystal display according to the foregoing The current tilt information adjusts the display viewing angle of the aforementioned liquid crystal display to satisfy the aforementioned user pupil visual viewing angle.

5 is a structural diagram of a viewing angle adjustment system of a liquid crystal display according to a second embodiment of the present invention. The adjustment system may include a front camera 501, a gravity sensor 502, and a processor 503; the front camera 501 And the processor 503 is configured to obtain a picture including the user's pupil position information, and is sent to the processor 503. The processor 503 is configured to obtain the offset information of the user's pupil relative to the center of the liquid crystal display according to the foregoing picture. The gravity sensor 502 is electrically coupled to the processor 503 for acquiring the current tilt information of the liquid crystal display, and is transmitted to the processor 503. The processor 503 is configured to use the current tilt information of the liquid crystal display and the foregoing The offset information of the user's pupil relative to the center of the liquid crystal display is adjusted to adjust the display angle of the liquid crystal display.

In this embodiment, the image including the user's pupil position information is first obtained, and the offset information of the user's pupil relative to the center of the liquid crystal display is obtained according to the foregoing picture; secondly, the current tilt information of the liquid crystal display is obtained; finally, according to the current tilt angle of the liquid crystal display. The information and the offset information of the user's pupil relative to the center of the liquid crystal display adjust the display angle of the liquid crystal display. In this embodiment, the smart phone or tablet computer with the liquid crystal display can automatically adjust the display angle of the liquid crystal display according to the information acquired by the gravity sensor and the identified pupil position information, so that the user can experience the best vision. Feel. Since the viewing angle of the liquid crystal display automatically changes according to the position change of the user's pupil, the current liquid crystal display is a wide viewing angle liquid crystal display for the user, and the liquid crystal display has a narrow viewing angle for the person around the user. People around the user can not see the contents of the screen because of the narrow viewing angle, which effectively protects the user's privacy.

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The patent protection scope of the invention is subject to the definition of the scope of the patent application attached to the specification.

Step 101‧‧‧Get a picture that includes information about the user's pupil position

Step 102‧‧‧Get the offset information of the user's pupil relative to the center of the LCD display

Step 103‧‧‧Get the current tilt information of the LCD display

Step 104‧‧‧Adjust the display angle of the liquid crystal display

Claims (7)

A liquid crystal display display angle adjustment method includes the following steps: acquiring a picture (101) including position information of a user pupil, comprising: performing a detecting and identifying step on a face; and searching for the recognized face area The position information of the user's pupil; obtaining an offset information (102) including the user's pupil relative to a center of the liquid crystal display according to the picture, comprising the following steps: dividing the picture into four quadrants; according to the position information of the user's pupil Determining a quadrant of the user's pupil; obtaining a distance from the user's pupil to the center of the liquid crystal display; and obtaining the offset information of the user's pupil relative to the center of the liquid crystal display according to the quadrant and the distance; acquiring the liquid crystal display And a current viewing angle information (103); and adjusting a display viewing angle (104) of the liquid crystal display according to the current tilting information of the liquid crystal display and the offset information including the user's pupil relative to the center of the liquid crystal display. The method for adjusting a viewing angle of a liquid crystal display according to claim 1, wherein before the obtaining the image (101) including the position information of the user's pupil, the method further comprises the steps of: identifying the user's pupil; and puncturing the user Positioning. The method for adjusting a viewing angle of a liquid crystal display according to claim 1 or 2, wherein obtaining the current tilt information (103) of the liquid crystal display further comprises the steps of: determining a stereo coordinate axis in advance, the stereo coordinate axis a first coordinate axis, a second coordinate axis, and a third coordinate axis, which are perpendicular to each other; and respectively acquire a gravity data of the liquid crystal display along the first, second, and third coordinate axes; and according to the gravity And obtaining the current tilt information of the liquid crystal display, where the current tilt information includes respective angle information of the liquid crystal display and the first, second, and third coordinate axes. The method for adjusting a viewing angle of a liquid crystal display according to claim 1 or 2, wherein the liquid crystal display is adjusted according to the current tilt information of the liquid crystal display and the offset information including the user's pupil relative to the center of the liquid crystal display The display viewing angle (104) further includes the steps of: determining a visual viewing angle of the user's pupil according to the offset information of the user's pupil relative to the center of the liquid crystal display; and adjusting the current tilting information according to the liquid crystal display The viewing angle of the liquid crystal display is to satisfy the visual viewing angle of the user's pupil. A liquid crystal display display angle adjustment device includes: a first acquisition module (401) for acquiring a picture including location information of a user pupil, the first acquisition module further comprising: an identification module, configured to: Identifying the user's pupil in the picture; a positioning module, configured to: after the identification module completes the identification of the user's pupil, position the user's pupil in the picture to obtain position information of the user's pupil; a second acquisition module (402), and The first obtaining module (401) is electrically connected to obtain an offset information of the user's pupil relative to a center of the liquid crystal display according to the image; a third acquiring module (403), and the second acquiring module The group (402) is electrically connected to obtain current tilt information of the liquid crystal display; and an adjustment module (404) is electrically connected to the third acquisition module (403) for use according to the liquid crystal display The current tilt information and the offset information of the user pupil relative to the center of the liquid crystal display adjust a display viewing angle of the liquid crystal display. The liquid crystal display display angle adjustment device of claim 5, wherein the third acquisition module (403) further comprises: a second determining sub-module for predetermining a stereo coordinate axis, the stereo The coordinate axis includes one of the first coordinate axes, a second coordinate axis and a third coordinate axis; and a third acquisition sub-module for respectively acquiring the liquid crystal display along the first, second, and a gravity data of the three coordinate axes; and a fourth acquisition sub-module, configured to acquire the current tilt information of the liquid crystal display according to the gravity data, where the current tilt information includes the liquid crystal display and the first and second The respective angle information of the third coordinate axis. The liquid crystal display display angle adjustment device according to claim 6, wherein the adjustment module (404) further comprises: a third determining sub-module, configured to determine a visual viewing angle of the user pupil according to the offset information of the user pupil relative to the center of the liquid crystal display; and an adjusting sub-module for determining the current according to the liquid crystal display The tilting information adjusts the display viewing angle of the liquid crystal display to satisfy the visual viewing angle of the user's pupil.