CN108474718B

CN108474718B - Screen detection device and method

Info

Publication number: CN108474718B
Application number: CN201880000345.3A
Authority: CN
Inventors: 蒋鹏; 任新东; 罗忠波
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2020-07-28
Anticipated expiration: 2038-03-29
Also published as: WO2019183873A1; CN108474718A

Abstract

The embodiment of the application provides a screen detection device and a screen detection method. The screen detection device comprises a supporting part, wherein a screen bearing table, a first detector and a reflecting piece are arranged on the supporting part; the screen bearing table is positioned between the reflecting piece and the first detector and is provided with a placing structure for bearing a screen to be detected; the reflecting piece and the first detector can move relatively, and when the reflecting piece is positioned at the working position of the reflecting piece, at least part of light emitted from the front surface of the screen to be detected is reflected to the first detector; the first detector is used for detecting first light leakage intensity and second light leakage intensity, and the first light leakage intensity and the second light leakage intensity are used for determining the light leakage ratio of the screen to be detected, wherein the first light leakage intensity is used for representing the back light intensity of the screen to be detected when the reflector deviates from the working position, and the second light leakage intensity is used for representing the back light intensity of the screen to be detected when the reflector is in the working position. The screen detection device has good accuracy in screen detection.

Description

Screen detection device and method

Technical Field

The embodiment of the application relates to the technical field of detection, in particular to a screen detection device and method.

Background

Optical fingerprint identification technique is a emerging biological identification technique under the screen, and it can carry out fingerprint identification with the setting of optical fingerprint identification module in the screen below of display screen. Because set up the optical fingerprint identification module in the screen below, need not to occupy the space that sets up of screen for electronic equipment can realize the full screen, helps promoting the screen area and accounts for the ratio.

However, in the present phase, due to the difference between the performance and the parameters of the screens designed by different display screen manufacturers, the imaging performance of the same optical fingerprint recognition module is different after the same optical fingerprint recognition module is installed on different screens, so that the optical fingerprint recognition modules installed on different screens cannot form stable fingerprint recognition accuracy. Therefore, the inventors have intensively studied to find that: the imaging performance of the optical fingerprint identification module is directly related to parameters of the display screen, such as light leakage ratio, extinction ratio, absolute light intensity and the like. In order to guarantee the imaging performance of the optical fingerprint identification module, accurate display screen parameters need to be acquired, and the acquisition of the existing display screen parameters depends on manual testing. However, the manual test introduces uncontrollable test errors in different degrees, so that the accuracy of the screen parameter test of the display screen is low, the consistency is poor, and the test efficiency is low. For example, the light intensity detection is not accurate due to insufficient distance between the sensor and the screen, or the detection results are not consistent for a plurality of times due to different distances between the sensor and the screen.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a screen detecting device and method for overcoming the problem of low detection accuracy caused by manual screen parameter detection in the prior art.

In a first aspect of the embodiments of the present application, a screen detecting device is provided, which includes a supporting portion, on which a screen bearing platform, a first detector and a reflecting member are disposed; the screen bearing table is positioned between the reflecting piece and the first detector and is provided with a placing structure for bearing a screen to be detected; the reflecting piece and the first detector can move relatively, and when the reflecting piece is positioned at the working position of the reflecting piece, at least part of light emitted from the front surface of the screen to be detected is reflected to the first detector; the first detector is used for detecting first light leakage intensity and second light leakage intensity, and the first light leakage intensity and the second light leakage intensity are used for determining the light leakage ratio of the screen to be detected, wherein the first light leakage intensity is used for representing the back light intensity of the screen to be detected when the reflector deviates from the working position, and the second light leakage intensity is used for representing the back light intensity of the screen to be detected when the reflector is in the working position.

In a second aspect of the embodiments of the present application, a method for detecting a screen to be detected by using the above-mentioned screen detecting apparatus is provided, where the method includes: enabling the screen to be detected to be in a bright screen state; when the reflecting piece deviates from the working position, detecting first light leakage intensity of the back of the screen to be detected through a first detector; when the reflector is in the working position, detecting second light leakage intensity on the back of the screen to be detected through the first detector; and determining the light leakage ratio of the screen to be detected according to the first light leakage intensity and the second light leakage intensity.

According to the technical scheme, on one hand, the screen detection device provided by the embodiment of the application bears and limits the screen to be detected through the placement structure of the screen bearing platform, so that the screen to be detected can be conveniently detected. Because the screen to be detected is positioned through the screen bearing platform, the positioning between the first detector and the screen to be detected can be accurate, interference caused during detection is avoided, and the accuracy of detection of the screen to be detected is further improved. On the other hand, the reflecting piece of the screen detection device is movably arranged on the supporting part and has two positions of a working position and a deviation working position, and at least part of light emitted from the front surface of the screen to be detected can be reflected to the first detector when the reflecting piece is in the working position. The first detector can detect the back light intensity (namely first light leakage intensity) of the screen to be detected when the reflector deviates from the working position and the back light intensity (namely second light leakage intensity) of the screen to be detected when the reflector is in the working position, so that the back light leakage ratio of the screen to be detected can be obtained through the first light leakage intensity and the second light leakage intensity, and the detection accuracy and consistency are better.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic perspective view illustrating a first viewing angle of a screen detecting apparatus according to a first embodiment of the present application;

FIG. 2 shows a partial enlarged view at A in FIG. 1;

fig. 3 is a schematic perspective view illustrating a second viewing angle of a screen detecting apparatus according to a first embodiment of the present application;

FIG. 4 shows a partial enlarged view at B in FIG. 3;

fig. 5 is a schematic cross-sectional structural view showing an extinction ratio detection portion of a screen detection apparatus according to a first embodiment of the present application;

fig. 6 is a schematic cross-sectional structural diagram illustrating an extinction ratio detection portion of a screen detection apparatus according to a first embodiment of the present application in cooperation with a screen to be detected;

fig. 7 shows a flowchart of a screen detection method according to a third embodiment of the present application;

fig. 8 shows a flowchart of a screen detection method according to the fourth embodiment of the present application.

Description of reference numerals:

11. a screen bearing table; 111. a placement structure; 12. a first detector; 13. a reflector; 14. a second detector; 15. a polarizing plate; 16. a drive assembly; 161. a drive motor; 162. installing a sleeve; 17. a screen to be tested; 18. a connecting member; 19. a first transmission assembly; 191. a first movable mounting plate; 192. a vertical slide rail; 20. a second transmission assembly; 21. a third detector; 22. a box body; a first mounting cylinder; 24. mounting a plate; 25. a second mounting cylinder; 26. and a third mounting cylinder.

Detailed Description

In order to make the objects, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.

The following further describes specific implementations of embodiments of the present application with reference to the drawings of the embodiments of the present application.

Firstly, explain the fingerprint identification principle of optical fingerprint identification module under the screen to and the influence factor of discernment accuracy:

normally, the back of the screen of the display screen is provided with black foam for absorbing light. When the fingerprint identification module under the screen is set up to needs below the screen of display screen, need get rid of at least partly with black bubble cotton for when the screen is bright screen state (that is the screen is lighted), the back of display screen can leak the light (probably including the light and the scattered light of each layer reflection in the display screen in this light that leaks). When the finger is placed above the screen of the lighted display screen, the light emitted by the screen of the display screen can be reflected by the finger to form reflected light, the reflected light can penetrate through the back of the screen to reach the screen, and the optical fingerprint identification module under the screen can utilize the reflected light to carry out fingerprint identification.

Because the screen of the display screen of different equipment has different characteristics, these differences can make the imaging performance of optics fingerprint identification module different under the same screen, lead to discernment accuracy unstability, influence the result of use. In order to obtain more unanimous optical fingerprint identification performance under the screen, need detect the display screen parameter before screen installation fingerprint identification module to adjust and select suitable fingerprint identification module, under the normal conditions, the parameter that influences the biggest to the identification accuracy of fingerprint identification module has the light leakage ratio and the extinction ratio etc. of screen.

Here, the light leakage Ratio of the screen (LL R, L eaking L weight Ratio, LL R) is a Ratio of the back light leakage intensity of the screen in the case of the front reflection light (denoted as P2) to the back light leakage intensity of the screen in the case of the no front reflection light (denoted as P1), that is, the light leakage Ratio is defined as LL R ═ P2/P1.

Based on the above description, the scheme of the present application is explained in detail by a plurality of examples below.

Example one

The present embodiment describes a screen detecting apparatus.

As shown in fig. 1 and 2, according to an embodiment of the present application, there is provided a screen detecting apparatus to detect a light leakage ratio, including a support part on which a screen stage 11, a first detector 12 and a reflector 13 are disposed; the screen bearing table 11 is positioned between the reflector 13 and the first detector 12 and is provided with a placing structure 111 for bearing a screen 17 to be tested; the reflector 13 and the first detector 12 can move relatively, when the reflector 13 is in the working position, at least part of light emitted from the front of the screen 17 to be detected is reflected to the first detector 12; the first detector 12 is used for detecting a first light leakage intensity and a second light leakage intensity, and the first light leakage intensity and the second light leakage intensity are used for determining the light leakage ratio of the screen to be detected, wherein the first light leakage intensity is used for representing the back light intensity of the screen 17 to be detected when the reflector 13 deviates from the working position, and the second light leakage intensity is used for representing the back light intensity of the screen 17 to be detected when the reflector 13 is in the working position.

The supporting part of the screen detection device is used for bearing other structures of the screen detection device, can provide installation space for the other structures, can be of any appropriate structure, such as an integrated structure, a split structure or a combined structure, and the like, and can be used as long as a supporting function can be realized. For example, in fig. 1, the support portion includes a case 22 and a mounting plate 24 attached to the case 22.

The placing structure 111 of the screen bearing table 11 is used for bearing and limiting the screen 17 to be detected, so that other structures can conveniently detect the screen 17 to be detected. In addition, because the screen 17 to be detected is positioned by the screen bearing table 11, the positioning between the first detector 12 and the screen 17 to be detected can be accurate, interference caused during detection is avoided, and the accuracy of detecting the screen 17 to be detected is further improved.

The reflector 13 is movably disposed on the support portion, has two positions, namely, an operating position and a deviation position, and can reflect at least part of light emitted from the front surface of the screen 17 to be measured toward the first detector 12 when moved to the operating position. The first detector 12 can detect the back light intensity (i.e., first light leakage intensity) of the screen 17 to be detected when the reflector 13 deviates from the working position and the back light intensity (i.e., second light leakage intensity) of the screen 17 to be detected when the reflector 13 is in the working position, so that the back light leakage ratio of the screen 17 to be detected can be obtained through the first light leakage intensity and the second light leakage intensity, and the detection accuracy and consistency are better.

In order to improve the detection accuracy and efficiency and reduce human intervention, the screen detection device further comprises an electric control part (not shown in the figure), which is arranged in the box body 22 and used for supplying power to the power utilization part of the screen detection device and receiving, sending and/or processing signals and/or data and the like.

The box 22 may be used not only for mounting the electric control part, but also as a part of a support part that supports the structure such as the screen stand 11. Of course, the support portion may include other structures capable of performing supporting and bearing functions in addition to the case 22, for example, the support portion may include a mounting plate or the like connected to the case 22. In order to avoid the adverse effect of light reflection of the components such as the box body 22 and the like on the detection, all structures of the screen detection device except the necessary structures are subjected to blackening treatment.

The electric control part at least comprises a power supply and a controller. Wherein the power supply supplies power to other parts. The controller is electrically connected to the power source, the first detector 12, the reflector 13, and the like. The controller can be preset with instructions for receiving and reading parameters, signals, parameter algorithms, data storage recording instructions, human-computer interaction instructions, instructions for driving and controlling other structures and the like transmitted by each component. For example, the controller may execute preset instructions therein to control the first detector 12 to detect, and may receive and process data detected by the first detector 12. The controller may also control the movement of the reflective element 13 to move the reflective element 13 to the operative position, or away from the operative position, if desired. For the sake of convenience of explanation, the position deviated from the working position will be referred to as an avoidance position hereinafter.

It should be noted that any position other than the operating position of the reflecting member 13 can be regarded as the avoidance position, that is, the reflecting member 13 can be regarded as the avoidance position as long as it is out of the operating position. In addition, the working position of the reflector 13 may be an area, not necessarily a point.

Control first detector 12 and reflector 13 through setting up the controller, can enough improve screen detection device's degree of automation, reduce artifical intensity of labour who detects, can guarantee the uniformity that detects at every turn again, avoid the problem of the different errors of introducing at every turn that artifical detection exists, make the accuracy and the uniformity that detect better, and then guarantee that the recognition accuracy degree after fingerprint identification sensor and the screen cooperation is higher under the screen.

The following describes the structure of the first detector 12 and the reflector 13:

it is obvious to those skilled in the art that the first detector 12 of any suitable form can be selected to detect the back light leakage intensity of the screen 17 to be detected. For example, the first detector 12 may be a photosensor, or a fiber optic spectrometer, or the like. When the optical fiber spectrometer is adopted, the detected optical information is more comprehensive. When a photosensor is employed, the photosensor may be a photosensor that detects visible light.

It should be noted that, when the first detector 12 employs a photoelectric sensor, the electric control unit includes a sensor conditioning circuit and a data acquisition card, in a matching manner, the sensor conditioning circuit is used for adjusting the electric signal output by the photoelectric sensor, and the data acquisition card is used for acquiring the electric signal output by the photoelectric sensor. The sampling rate of the data acquisition card can be adjusted according to different required data accuracy, so that the data accuracy is improved or reduced. When the data precision is reduced, the data processing speed can be improved, and the detection efficiency is higher.

Optionally, in order to facilitate replacement of the screen 17 to be tested and prevent the first detector 12 from being damaged when the screen 17 to be tested is replaced, as shown in fig. 1, the first detector 12 may be connected to the supporting portion through a first transmission assembly 19 and may be driven by the first transmission assembly 19 to move in a vertical or horizontal direction so as to adjust a vertical or horizontal distance between the first detector 12 and the screen plummer 11. Therefore, when the screen 17 to be tested is replaced, the first detector 12 and the screen 17 to be tested have a sufficient distance, so that the replacement is convenient and the safety is ensured.

Optionally, in this embodiment, the first transmission assembly 19 includes a vertical slide rail 192 disposed vertically, a first moving mounting plate 191 movably disposed on the vertical slide rail 192, and a driving member (not shown in the figure), the driving member can drive the first moving mounting plate 191 to move, a first mounting cylinder 23 for mounting the first detector 12 is disposed on the first moving mounting plate 191, and the first detector 12 is disposed in the first mounting cylinder 23. The first mounting cylinder 23 can provide a closed detection space for the first detector 12, so as to prevent ambient light from affecting the detection accuracy of the first detector 12. In addition, when the driving member drives the first movable mounting plate 191 to move, the first mounting cylinder 23 and the first detector 12 therein may also move along the vertical direction along with the first movable mounting plate 191, so as to adjust the vertical distance between the first detector 12 and the screen 17 to be measured.

Of course, in other embodiments, in order to adjust the vertical distance between the first detector 12 and the screen 17 to be detected, the screen supporting platform 11 may be connected to the box 22 through a structure such as an air cylinder, so that the distance between the screen 17 to be detected and the first detector 12 may be adjusted through the expansion and contraction of the air cylinder, and the first detector 12 may be configured in a non-moving structure. Or both the first detector 12 and the screen carrier 11 may be movably arranged.

Alternatively, since the reflective member 13 moves between the working position and the avoiding position, the reflective member 13 can be connected to the supporting portion by the second transmission assembly 20 and can move under the driving of the second transmission assembly 20 to move the reflective member 13 to the working position or the avoiding position.

For example, as shown in fig. 3 and 4, the reflecting member 13 may be a mirror. The second transmission assembly 20 includes a transverse slide rail disposed transversely, a second movable mounting plate movably disposed on the transverse slide rail, and a driving member (not shown in the figure), wherein the second movable mounting plate is used for mounting the reflection member 13, and when the driving member drives the second movable mounting plate to move on the transverse slide rail, the reflection member 13 moves therewith.

Alternatively, in order to improve the reflection effect, the reflection member 13 is disposed in the second mounting cylinder 25 and is coupled to the second moving mounting plate through the second mounting cylinder 25, so that the reflected light can be effectively confined by the second mounting cylinder 25.

In order to make the function of the screen detection device more comprehensive, optionally, the screen detection device in this embodiment can further include an extinction ratio detection portion for measuring the extinction ratio of the screen 17 to be detected besides being capable of detecting the light leakage ratio of the screen 17 to be detected, and by setting the extinction ratio detection portion, the detection function and the detection effect of the screen detection device are further improved, and the equipment cost is reduced.

Because the emergent light of the screen 17 that awaits measuring is when the linear polarization light, behind the cooperation of optical fingerprint identification module under screen 17 and the screen that awaits measuring, the fingerprint identification effect of optical fingerprint identification module is better under the screen. Therefore, in the embodiment, whether the emergent light of the screen 17 to be detected is linearly polarized light is determined by detecting the Extinction Ratio (ER) of the screen 17 to be detected, so that the parameters of the fingerprint identification module matched with the emergent light are adjusted or selected according to the actual extinction ratio of the screen 17 to be detected, and the fingerprint identification effect is ensured.

Specifically, whether the emergent light of the screen 17 to be measured is linearly polarized light can be detected by using a rotating polarizer, for example, the linearly polarized light is rotated by 180 ° or more above the screen to be measured, so as to obtain the strongest light intensity Pmax and the weakest light intensity Pmin, and then according to the extinction ratio calculation formula: ER 10 × lg (Pmax/Pmin) gives the extinction ratio. Generally, when ER is more than or equal to 12dB, the emergent light of the screen 17 to be measured is considered to be linearly polarized light.

Based on this, the extinction ratio detection portion is disposed on the supporting portion corresponding to the placing structure 111, and is located on the same side of the screen holding stage 11 as the reflection member 13.

It is obvious to those skilled in the art that any structure capable of detecting the extinction ratio can be selected as desired. For example, as shown in fig. 5 and 6, in the present embodiment, the extinction ratio detection section includes the second detector 14, the polarizing plate 15, and the driving assembly 16.

The second detector 14 may be a photoelectric sensor, or other suitable structure, such as a fiber optic spectrometer, for detecting the light intensity of the outgoing light from the screen 17 to be measured to determine the polarization state. The polarizing plate 15 needs to be disposed between the second detector 14 and the screen 17 to be measured to detect the polarization state of the outgoing light. The polarizer 15 is capable of rotating relative to the second detector 14 under the driving of the driving assembly 16.

As shown in fig. 5, in one possible approach, the drive assembly 16 includes a drive motor 161 and a mounting sleeve 162.

The driving motor 161 is provided on the support portion as a power source. In order to improve the accuracy of the control, each driving member, the driving motor 161, and the like in the present embodiment are preferably a closed-loop stepping motor. Correspondingly, the electric control part also comprises a closed-loop stepping motor controller and a driver thereof for controlling each driving part and the driving motor 161, and the controller is connected with the closed-loop stepping motor controller and the driver and the like so as to control the operation or stop of the controller.

The mounting sleeve 162 is connected to the output shaft of the driving motor 161, and is used for setting the polarizer 15, and can rotate along with the output shaft to drive the polarizer 15 thereon to rotate relative to the second detector 14, so that the second detector 14 can collect the polarization state of the emergent light of the screen 17 to be detected of the mobile phone in the rotating process of the polarizer 15.

Note that, in order to enable the second detector 14 to detect the intensity of the polarized light, the second detector 14 is disposed in the mounting sleeve 162 through the connecting member 18. In addition, in order to prevent the second detector 14 from rotating with the mounting sleeve 162, the connecting member 18 is disposed in the mounting sleeve 162, particularly via a bearing, and the second detector 14 is further disposed on the connecting member 18.

Optionally, in this embodiment, the screen detecting apparatus further includes a third detector 21 for detecting the intensity of the emergent light from the front surface of the screen 17 to be detected, the third detector 21 is disposed on the box 22 of the supporting portion, and the third detector 21 and the reflector 13 are located on the same side of the screen bearing table 11. The third detector 21 may be a photosensor or a fiber optic spectrometer, or the like.

The spectral response range of each photosensor in the present embodiment is preferably the visible light range.

Alternatively, in order to improve the detection accuracy and avoid the interference of the ambient light with the detection of the third detector 21, the third detector 21 is disposed in the third mounting cylinder 26 and is mounted on the box 22 of the supporting portion through the third mounting cylinder 26.

Based on the screen detection device, the process of detecting the screen 17 to be detected comprises the following steps:

the screen 17 to be detected is placed on the placement structure 111 of the screen bearing table 11, the back surface of the screen is upward, the front surface of the screen is downward, and the area of the screen 17 to be detected, from which the black foam is removed, is opposite to the first detector 12 for subsequent detection. And the power supply is turned on to supply power to the screen detection device.

After the screen detecting device is powered on, the controller controls the first detector 12 to move in the vertical direction so as to reach the detection position. The controller controls the first detector 12, the second detector 14 and the third detector 21 to detect the dark background light intensity value as a reference value. The conditioning circuits respectively connected with the first detector 12, the second detector 14 and the third detector 21 condition the signals indicating the dark background light intensity value output by the conditioning circuits, and then the high-precision data acquisition card sends the acquired signals to the controller. The controller may perform data processing, display, storage, etc. on these signals.

After detecting the dark background light intensity value, the controller lights the screen 17 to be tested through the screen driving module (even if the screen 17 to be tested is in a bright screen state).

When the reflector 13 is in the avoidance position during the light leakage ratio measurement, the controller causes the first detector 12 to detect the back light leakage intensity when the screen 17 to be measured is in a bright screen state, and the difference between the back light leakage intensity and the dark background light intensity value detected by the first detector 12 is the first light leakage intensity on the back of the screen under the condition of no front reflected light (denoted as P1). At this time, the back light leakage of the screen 17 to be measured includes light reflected and scattered by each layer in the screen 17 to be measured.

The controller controls the reflector 13 to move to the working position, and the controller is opposite to the first detector 12, and measures the back light leakage intensity of the screen 17 to be measured after covering the reflector 13 through the first detector 12, and the difference value between the back light leakage intensity and the dark background light intensity value detected by the first detector 12 is the second light leakage intensity of the back of the screen under the condition that the front reflected light exists (denoted as P2). At this time, the back light leakage of the screen 17 to be measured includes light reflected and scattered by each layer in the screen 17 to be measured, and also includes light reflected by at least a part of the reflector 13. The controller can calculate the light leakage ratio of the screen 17 to be measured after acquiring the light intensity value P1 and the light intensity value P2.

When the extinction ratio is detected, the controller controls the driving motor 161 to rotate, thereby rotating the polarizer 15 (linear polarizer) at least 180 ° about the vertical axis. During the rotation of the polarizer 15, the second detector 14 collects the light intensity after passing through the polarizer 15 at intervals, and transmits the collected signals to the controller, which determines a maximum light intensity value (denoted as Pmax) and a minimum light intensity value (denoted as Pmin) from the obtained signals, and calculates the extinction ratio based on the maximum light intensity value and the minimum light intensity value. The time interval (i.e. the aforementioned period of time) between two adjacent detections of the second detector 14 can be set to a suitable time length according to the requirement, for example, 10ms, 50ms, 100ms, etc., which is not limited in this embodiment of the application.

When detecting the absolute light intensity, the controller controls the third detector 21 to detect the front emergent light intensity of the screen 17 to be detected in a bright screen state.

After the test is completed, the controller can control the first transmission assembly 19, the second transmission assembly 20, the driving motor and the like to move in the reverse direction and return to the original position for subsequent detection.

In the above-described detection process, if an abnormality or an alarm occurs in any one of the structures during operation, the detection is terminated, the first detector 12, the reflecting member 13, the polarizing plate 15, and the like are returned, and the acquired data are stored.

This screen detection device can be applied to the screening of the unusual screen in the screen especially O L ED screen or be applied to the supplied materials detection to the O L ED screen with fingerprint identification module complex under the screen, it can realize participating in carrying out automated test to the optical screen of O L ED screen, help improving the accuracy and the uniformity of screen optical parameter test, eliminate the experimental error that manual test introduced, improve O L ED screen and participate in efficiency of software testing, improve the uniformity of fingerprint module performance under the screen.

Example two

According to an embodiment of the present application, another screen detecting apparatus is provided to detect an extinction ratio, and includes a supporting portion, a screen supporting stage 11 and an extinction ratio detecting portion for detecting an extinction ratio of a screen 17 to be detected, wherein the screen supporting stage 11 is disposed on the supporting portion and has a placing structure 111 for bearing the screen 17 to be detected.

The screen detection device can detect the extinction ratio of the screen 17 to be detected without manual intervention, avoids errors caused by manual detection, improves the detection accuracy, and has better consistency of detection at every time when the device is used for detection.

It is obvious to those skilled in the art that any structure capable of detecting the extinction ratio can be selected as desired. For example, in the present embodiment, the extinction ratio detection section includes the second detector 14, the polarizing plate 15, and the driving member 16.

The second detector 14 may be a photoelectric sensor, or other suitable structure, such as a fiber optic spectrometer, for detecting the polarization state of the emergent light from the screen 17 to be detected. The polarizing plate 15 needs to be disposed between the second detector 14 and the screen 17 to be measured so that the second detector 14 collects the light intensity of the outgoing light of the screen 17 to be measured to determine the polarization state. The polarizer 15 is rotatable relative to the second detector 14 under the drive of the drive assembly 16.

In one possible approach, the drive assembly 16 includes a drive motor 161 and a mounting sleeve 162.

The mounting sleeve 162 is connected to the output shaft of the driving motor 161, and is used for arranging the polarizer 15, and can rotate along with the output shaft to drive the polarizer 15 thereon to rotate relative to the second detector 14, so that the second detector 14 can collect the light intensity of the polarized light in each direction of the emergent light in the rotating process of the polarizer 15.

In order to enable the second detector 14 to detect the intensity of polarized light in each direction, the second detector 14 is disposed in the mounting sleeve 162 through the connecting member 18. In addition, in order to prevent the second detector 14 from rotating with the mounting sleeve 162, the connecting member 18 is disposed in the mounting sleeve 162, particularly via a bearing, and the second detector 14 is further disposed on the connecting member 18.

Optionally, in order to improve the automation degree of the screen detection device and reduce the labor intensity of the worker, the screen detection device further includes an electric control portion, and the electric control portion is disposed in the box 22. The electric control part is electrically connected with other structures of the screen detection device to realize data receiving, sending, processing and the like, thereby realizing automatic screen detection.

In this embodiment, the electric control portion at least includes a power supply and a controller, and the power supply supplies power to other structures. The controller is connected with other structures and controls the other structures. For example, the controller is connected to the second detector 14, and collects signals and data detected by the second detector 14 and processes the collected data. The controller is connected to the driving motor 161 to rotate or stop it.

When the extinction ratio is detected, the controller controls the driving motor 161 to rotate, thereby rotating the polarizer 15 (linear polarizer) at least 180 ° about the vertical axis. During the rotation of the polarizer 15, the second detector 14 collects the light intensity after passing through the polarizer 15 at intervals, and transmits the collected signals to the controller, which determines a maximum light intensity value (denoted as Pmax) and a minimum light intensity value (denoted as Pmin) from the obtained signals, and calculates the extinction ratio based on the maximum light intensity value and the minimum light intensity value.

Compared with the first embodiment, the screen detection device can only comprise an extinction ratio detection part, can reduce the volume of the device and reduce the weight of the device under the condition of detecting the extinction ratio, and is more convenient to transport, in addition, the screen detection device can also realize the automatic test of the optical screen parameter of the O L ED screen, is beneficial to improving the accuracy and consistency of the optical parameter test of the screen, eliminates the experimental error introduced by manual test, improves the O L ED screen parameter testing efficiency, and improves the consistency of the performance of the fingerprint module under the screen.

EXAMPLE III

As shown in fig. 7, according to an embodiment of the present application, a screen inspection method is provided, which inspects a screen 17 to be inspected by using the screen inspection device in the first embodiment.

The screen detection method of the embodiment comprises the following steps:

s101: the screen 17 to be measured is in a bright screen state.

The controller can energize the screen 17 to be tested through the screen driving module, and light up the screen to make it in a bright screen state.

S102: when the reflector 13 deviates from the working position (i.e., is in the avoidance position), the first detector 12 detects a first leak light intensity at the back of the screen 17 to be detected.

The first light leakage intensity is used for indicating the light intensity of the region of the screen 17 to be tested where the black foam on the back surface is removed (the light emitted from the region where the black foam on the back surface is removed may be referred to as light leakage) in the case where the screen 17 to be tested is in a bright screen state and the light is not reflected by the reflector 13.

The first detector 12 may be a photo sensor, and the controller may control the first detector 12 to detect the light intensity of the backlight when the screen 17 to be detected is in a bright screen state, so as to obtain a first light leakage intensity.

In the present embodiment, the first light leakage intensity (denoted as P1) may be a difference between a dark background value (denoted as P10) detected by the first detector 12 when the screen 17 to be tested is not in a bright screen state and a back light leakage intensity (denoted as P11) detected by the first detector 12 when the screen 17 to be tested is in a bright screen state and no light is reflected by the reflector 13, and is represented as P1-P11-P10.

S103: when the reflector 13 is in the working position, the first detector 12 detects a second light leakage intensity on the back of the screen 17 to be detected.

The controller can control the reflector 13 to move, so that when the reflector 13 moves to a working position which is over against the first detector 12 in the vertical direction, the reflector reflects light emitted from the front surface of the screen 17 to be detected, at least a part of the reflected light can be transmitted out from the back surface of the screen 17 to be detected, and at the moment, the controller can control the first detector 12 to detect the back light intensity of the screen 17 to be detected at the moment, so that the second light leakage intensity of the back surface of the screen 17 to be detected is obtained.

The second light leakage intensity (denoted as P2) may be a difference between a dark background value (denoted as P10) detected by the first detector 12 when the screen 17 to be tested is not in a bright screen state and a light intensity (denoted as P21) of the backlight detected by the first detector 12 when the screen 17 to be tested is in a bright screen state and the light reflected by the reflector 13 is present, and may be represented as: p2 ═ P21-P10.

S104: and determining the light leakage ratio of the screen 17 to be detected according to the first light leakage intensity and the second light leakage intensity.

After the controller acquires the first light leakage intensity and the second light leakage intensity, the light leakage ratio of the screen to be detected can be calculated. The light leakage ratio is the ratio of the second light leakage intensity to the first light leakage intensity.

It should be noted that, although the first leak intensity is detected before the second leak intensity is detected in the embodiment for convenience of description, it should be understood by those skilled in the art that the detection order of the first leak intensity and the second leak intensity is not limited to the order of the embodiment, and in other embodiments, the second leak intensity may be detected first, and then the first leak intensity may be detected.

The screen detection method can automatically detect the light leakage ratio of the screen 17 to be detected, and compared with manual detection, the screen detection method can reduce labor intensity, improve detection accuracy and consistency and avoid errors caused by manual detection.

Optionally, when the extinction ratio needs to be detected, the screen detection method may further include the steps of:

s105: the polarizer 15 is rotated by a predetermined angle, wherein the value range of the predetermined angle is greater than or equal to the predetermined angle value.

The set angle value can be determined as desired, for example, the set angle value is 180 °.

The controller may rotate the mounting sleeve and polarizer 15 by rotating the drive motor. For example, the polarizing plate 15 is rotated by 180 ° about a vertical axis.

S106: in the rotating process of the polarizer 15, detecting the first emergent light intensity of the screen 17 to be detected once by the second detector 14 at preset time intervals, wherein the first emergent light intensity is used for indicating the emergent light intensity of the front surface of the screen 17 to be detected after passing through the polarizer 15.

During the rotation of the polarizer 15, the second detector 14 may detect the intensity of the light emitted from the screen 17 to be measured after passing through the polarizer 15 at a predetermined time interval under the control of the controller, so as to obtain a plurality of first emitted light intensities.

The preset time can be set to a proper duration as required, and the controller can also adjust the preset time by adjusting the sampling rate of the high-precision data acquisition card and the sampling rate of the signals acquired by the second detector 14.

S107: and determining the maximum emergent light intensity and the minimum emergent light intensity in all the first emergent light intensities.

When the rotation of the polarizing plate 15 is completed, the controller determines the maximum outgoing light intensity (denoted as Pmax) and the minimum outgoing light intensity (denoted as Pmin) from all the acquired first outgoing light intensities.

S108: and determining the extinction ratio of the screen 17 to be tested according to the maximum emergent light intensity and the minimum emergent light intensity.

The controller determines the extinction ratio according to an extinction ratio calculation formula, the maximum emergent light intensity and the minimum emergent light intensity, wherein the extinction ratio calculation formula is as follows: ER is 10 × lg (Pmax/Pmin).

Optionally, when the absolute light intensity of the emergent light of the screen 17 to be detected needs to be detected, the method further comprises the following steps:

s109: the absolute light intensity of the front-side outgoing light of the screen 17 to be measured is detected by the third detector 21.

The absolute light intensity of the emergent light on the front surface of the screen 17 to be detected is directly detected by a third detector arranged on the front surface of the screen 17 to be detected.

By the screen detection method, automatic screen detection can be realized by using the screen detection device, the accuracy and consistency of screen optical parameter test are improved, and the efficiency of optical parameter test is improved.

Example four

As shown in fig. 8, according to the embodiment of the present application, another screen inspection method is provided, in which the screen 17 to be inspected is inspected by the screen inspection apparatus in the second embodiment.

The screen detection method comprises the following steps:

s201: the screen 17 to be measured is in a bright screen state.

S202: the polarizer 15 is rotated by a predetermined angle, wherein the value range of the predetermined angle is greater than or equal to the predetermined angle value.

S203: in the rotating process of the polarizer 15, detecting the first emergent light intensity of the screen 17 to be detected once by the second detector 14 at preset time intervals, wherein the first emergent light intensity is used for indicating the emergent light intensity of the front surface of the screen 17 to be detected after passing through the polarizer 15.

S204: and determining the maximum emergent light intensity and the minimum emergent light intensity in all the first emergent light intensities.

S205: and determining the extinction ratio of the screen 17 to be tested according to the maximum emergent light intensity and the minimum emergent light intensity.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A screen detection device comprises a supporting part, wherein a screen bearing table (11), a first detector (12) and a reflecting piece (13) are arranged on the supporting part;

the screen bearing table (11) is positioned between the reflecting piece (13) and the first detector (12) and is provided with a placing structure (111) for bearing a screen (17) to be tested;

the reflecting piece (13) and the first detector (12) can move relatively, and when the reflecting piece (13) is in the working position, at least part of light emitted from the front surface of the screen (17) to be detected is reflected to the first detector (12);

first detector (12) are used for detecting first light leak intensity and second light leak intensity, first light leak intensity and second light leak intensity are used for confirming the light leak ratio of the screen that awaits measuring, wherein, first light leak intensity is used for the representation the back light intensity of screen (17) awaits measuring when reflector (13) are located dodge the position, second light leak intensity is used for the representation reflector (13) are in screen (17) back light intensity awaits measuring during the operating position.

2. The screen detecting device of claim 1, wherein the screen detecting device further comprises: and the extinction ratio detection part is used for measuring the extinction ratio of the screen (17) to be measured and is arranged on the supporting part corresponding to the placing structure (111).

3. The screen detecting device according to claim 2, wherein the extinction ratio detecting portion includes a second detector (14), a polarizing plate (15), and a driving assembly (16), the polarizing plate (15) is located between the second detector (14) and a screen (17) to be detected, and the polarizing plate (15) is rotatable relative to the second detector (14) by the driving assembly (16).

4. The screen detecting device according to claim 3, wherein the driving assembly (16) comprises:

a driving motor (161), the driving motor (161) being disposed on the supporting portion;

the mounting sleeve (162) is connected to an output shaft of the driving motor (161), and the polarizing plate (15) is arranged on the mounting sleeve (162) and can rotate along with the output shaft relative to the second detector (14).

5. The screen detecting device according to claim 4, wherein the second detector (14) is arranged within the mounting sleeve (162) by means of a connection (18).

6. The screen detecting device according to claim 5, wherein the connecting piece (18) is arranged within the mounting sleeve (162) by means of a bearing, the second detector (14) being arranged on the connecting piece (18).

7. The screen detecting device according to any one of claims 1 to 6, wherein the first detector (12) is connected to the support portion by a first transmission assembly (19) and is movable by the first transmission assembly (19) to adjust a distance between the first detector (12) and the screen carrier.

8. The screen detecting device according to any one of claims 1 to 6, wherein the reflecting member (13) is connected to the supporting portion by a second transmission assembly (20) and is movable by the second transmission assembly (20) to move the reflecting member (13) to the working position or the avoiding position.

9. The screen detecting device according to any one of claims 1 to 6, wherein the screen detecting device further comprises: the third detector (21) is used for detecting the positive emergent light intensity of the screen (17) to be detected, the third detector (21) is arranged on the supporting part, and the third detector (21) and the reflecting piece (13) are positioned on the same side of the screen bearing platform.

10. A screen inspection method for inspecting a screen to be inspected by the screen inspection apparatus of any one of claims 1 to 9, the method comprising:

enabling the screen to be detected to be in a bright screen state;

when the reflector is located at the avoiding position, detecting first light leakage intensity of the back of the screen to be detected through the first detector;

when the reflector is located at the working position, detecting second light leakage intensity of the back of the screen to be detected through the first detector;

and determining the light leakage ratio of the screen to be detected according to the first light leakage intensity and the second light leakage intensity.

11. The screen detection method of claim 10, wherein the method further comprises:

rotating the polaroid by a preset angle, wherein the value range of the preset angle is greater than or equal to the set angle value;

detecting first emergent light intensity of the screen to be detected once by a second detector at preset time intervals in the rotation process of the polaroid, wherein the first emergent light intensity is used for indicating the emergent light intensity of the front surface of the screen to be detected after passing through the polaroid;

determining the maximum emergent light intensity and the minimum emergent light intensity from all the first emergent light intensities;

and determining the extinction ratio of the screen to be tested according to the maximum emergent light intensity and the minimum emergent light intensity.

12. The screen detecting method of claim 11, wherein the set angle value takes a value of 180 °.

13. The screen detection method of claim 10, wherein the method further comprises:

and detecting the absolute light intensity of the emergent light on the front side of the screen to be detected through a third detector.