WO2019183873A1

WO2019183873A1 - Device and method for testing a screen

Info

Publication number: WO2019183873A1
Application number: PCT/CN2018/081045
Authority: WO
Inventors: 蒋鹏; 任新东; 罗忠波
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2019-10-03
Also published as: CN108474718A; CN108474718B

Abstract

Provided are a device and a method for testing a screen. The device for testing a screen comprises a support portion, and a screen carrying platform (11), a first testing device (12), and a reflector (13) disposed on the support portion. The screen carrying platform (11) is located between the reflector (13) and the first testing device (12) and has a placement structure (111) on which a screen under test is placed. The reflector (13) is movable relative to the first testing device (12), and the reflector (13) reflects at least a part of the light emitted from the front of the screen under test to the first testing device (12) when the reflector (13) is located at an operation position thereof. The first testing device (12) is used to measure first light leakage intensity and second light leakage intensity, and the first light leakage intensity and the second light leakage intensity are used to determine a light leakage ratio of the screen under test, wherein the first light leakage intensity is used to represent the intensity of light emitted from the back of the screen under test when the reflector (13) deviates from the operation position, and the second light leakage intensity is used to represent the intensity of light emitted from the back of the screen under test when the reflector (13) is located at the operation position. The device for testing a screen has good screen testing accuracy.

Description

Screen detecting device and method

Technical field

The embodiments of the present application relate to the field of detection technologies, and in particular, to a screen detection apparatus and method.

Background technique

The screen optical fingerprint recognition technology is an emerging biometric technology, which can set the optical fingerprint recognition module under the screen of the display screen for fingerprint recognition. Since the optical fingerprint recognition module is disposed at the bottom of the screen, the installation space of the screen is not required, so that the electronic device can realize a comprehensive screen, which helps to increase the screen area ratio.

However, at this stage, due to the difference in performance and parameters of the screens designed by different display manufacturers, the same optical fingerprint recognition modules are installed on different screens, and the imaging performance is different, resulting in installation on Optical fingerprint recognition modules of different screens cannot form stable fingerprint recognition accuracy. To this end, the inventors have found through in-depth research that the imaging performance of the optical fingerprint recognition module is directly related to the display parameters such as the light leakage ratio, extinction ratio, and absolute light intensity of the display screen. In order to ensure the imaging performance of the optical fingerprint recognition module, it is necessary to obtain accurate display parameters, and the acquisition of existing display parameters depends on manual testing. However, manual testing introduces uncontrollable test errors to varying degrees, resulting in low accuracy, poor consistency, and low test efficiency. For example, due to insufficient distance between the sensor and the screen, the light intensity detection is inaccurate, or the detection results are inconsistent due to the different distance between the sensor and the screen.

Summary of the invention

In view of this, one of the technical problems to be solved by the embodiments of the present application is to provide a screen detecting apparatus and method for overcoming the problem of manually detecting screen parameters in the prior art and detecting low accuracy.

A first aspect of the embodiments of the present application provides a screen detecting apparatus including a supporting portion provided with a screen carrying platform, a first detector and a reflecting member; the screen carrying platform is located between the reflecting member and the first detector And having a placement structure for carrying the screen to be tested; the reflector is movable relative to the first detector, and when the reflector is in its working position, at least part of the light emitted from the front surface of the screen to be tested is reflected to the first detector; The device is configured to detect a first light leakage intensity and a second light leakage intensity, wherein the first light leakage intensity and the second light leakage intensity are used to determine a light leakage ratio of the screen to be tested, wherein the first light leakage intensity is used to characterize the screen to be tested when the reflector is offset from the working position The back light intensity is used to characterize the light intensity of the back surface of the screen to be tested when the reflector is in the working position.

A second aspect of the embodiments of the present application provides a screen detecting method, where the method detects a screen to be tested by the screen detecting device, the method includes: causing a screen to be tested to be in a bright screen state; when the reflecting member deviates from the work In the position, the first light leakage intensity of the back surface of the screen to be tested is detected by the first detector; when the reflective member is in the working position, the second light leakage intensity of the back surface of the screen to be tested is detected by the first detector; according to the first light leakage intensity and the second The light leakage intensity determines the light leakage ratio of the screen to be tested.

It can be seen from the above technical solution that, on the one hand, the screen detecting device of the embodiment of the present application carries and limits the screen to be tested through the placement structure of the screen carrier to facilitate detection of the screen to be tested. Since the screen to be tested is positioned through the screen carrier, the positioning between the first detector and the screen to be tested can be accurately ensured, thereby avoiding introduction of interference during detection, thereby improving the accuracy of detection of the screen to be tested. On the other hand, the reflecting member of the screen detecting device is movably disposed on the supporting portion, and has two working positions of a working position and a deviation from the working position, and at least part of the light emitted from the front surface of the screen to be tested is reflected to the first position in the working position. A detector. The first detector can detect the back light intensity of the screen to be tested when the reflector is offset from the working position (ie, the first light leakage intensity), and the light intensity of the back surface of the screen to be tested when the reflector is in the working position (ie, the second light leakage intensity), so that The first light leakage intensity and the second light leakage intensity can obtain the back light leakage ratio of the screen to be tested, 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 to be used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present application, and other drawings can be obtained according to the drawings without any creative labor for those skilled in the art.

1 is a perspective structural view showing a first angle of view of a screen detecting device according to Embodiment 1 of the present application;

Figure 2 shows a partial enlarged view of A in Figure 1;

3 is a schematic perspective structural view of a second viewing angle of a screen detecting device according to Embodiment 1 of the present application;

Figure 4 shows a partial enlarged view of B in Figure 3;

5 is a cross-sectional structural view showing an extinction ratio detecting portion of a screen detecting device according to Embodiment 1 of the present application;

6 is a cross-sectional structural view showing the matte ratio detecting portion of the screen detecting device and the screen to be tested according to the first embodiment of the present application;

FIG. 7 is a flowchart showing a screen detecting method according to Embodiment 3 of the present application;

FIG. 8 shows a flow chart of a screen detecting method according to Embodiment 4 of the present application.

Description of the reference signs:

11, a screen carrier; 111, a placement structure; 12, a first detector; 13, a reflector; 14, a second detector; 15, a polarizer; 16, a drive assembly; 161, a drive motor; 162, a mounting sleeve ; 17, the screen to be tested; 18, the connector; 19, the first transmission component; 191, the first mobile mounting plate; 192, the vertical rail; 20, the second transmission component; 21, the third detector; a casing; a first mounting cylinder; 24, a mounting plate; 25, a second mounting cylinder; 26, a third mounting cylinder.

detailed description

In order to make the object, the features and the advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. The described embodiments are only a part of the embodiments of the embodiments of the present application, and not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of protection of the embodiments of the present application.

The specific implementation of the embodiments of the present application is further described below with reference to the accompanying drawings.

Firstly, the fingerprint recognition principle of the screen optical fingerprint recognition module and the influencing factors of the recognition accuracy are explained:

Normally, the back of the screen is provided with black foam for absorbing light. When it is necessary to set the under-screen fingerprint recognition module at the bottom of the screen of the display screen, it is necessary to remove at least a part of the black foam so that when the screen is in a bright state (ie, the screen is illuminated), the back of the display screen can leak light ( This leakage of light may include light reflected from layers in the display screen and scattered light). When the finger is placed on the screen of the illuminated display screen, the finger will reflect the light emitted by the screen of the display screen to form reflected light, and the reflected light will penetrate the screen to reach the back of the screen, and the optical fingerprint recognition module can utilize the screen. Reflected light for fingerprint recognition.

Since the screens of the display screens of different devices have different characteristics, these differences may cause different imaging performances of the optical fingerprint recognition modules of the same screen, resulting in unstable recognition accuracy and affecting the use effect. In order to obtain more consistent on-screen optical fingerprint recognition performance, it is necessary to detect the display screen parameters before installing the fingerprint recognition module on the screen to adjust and select an appropriate fingerprint recognition module. Generally, the recognition accuracy of the fingerprint recognition module is The most influential parameters are the light leakage ratio and extinction ratio of the screen.

The leakage light ratio (LLR) of the screen refers to the light leakage intensity of the back surface of the screen (referred to as P2) in the case of front reflected light and the back light leakage intensity in the case of no front reflected light ( The ratio referred to as P1), that is, the light leakage ratio is defined as LLR = P2 / P1. The extinction ratio (ER) characterizes the polarization state of the light exiting the screen. For example, by obtaining the light intensity at each angle of the detector screen, the strongest light intensity Pmax and the weakest light intensity Pmin are obtained, and the extinction ratio is calculated according to the extinction ratio formula ER=10*lg (Pmax/Pmin).

Based on the above description, the solution of the present application will be described in detail below through various embodiments.

Embodiment 1

This embodiment describes a screen detecting device.

As shown in FIGS. 1 and 2, according to an embodiment of the present application, a screen detecting device for detecting a light leakage ratio is provided, including a support portion on which a screen carrier 11, a first detector 12, and a reflector 13 are disposed. The screen carrier 11 is located between the reflector 13 and the first detector 12 and has a placement structure 111 carrying the screen 17 to be tested; the reflector 13 is movable relative to the first detector 12, and the reflector 13 is in its working position. At least part of the light emitted from the front side of the screen 17 to be tested is reflected toward the first detector 12; the first detector 12 is configured to detect the first light leakage intensity and the second light leakage intensity, and the first light leakage intensity and the second light leakage intensity are used for Determining a light leakage ratio of the screen to be tested, wherein the first light leakage intensity is used to characterize the back light intensity of the screen 17 to be tested when the reflector 13 is offset from the working position, and the second light leakage intensity is used to characterize the screen to be tested when the reflector 13 is in the working position 17 back light intensity.

The support portion of the screen detecting device is used to carry other structures of the screen detecting device, and may provide installation space for other structures. The supporting portion may be any suitable structure, such as an integrated structure, a split structure or a combined structure, as long as Achieve support functions. For example, in FIG. 1, the support portion includes a case 22 and a mounting plate 24 attached to the case 22.

The placement structure 111 of the screen carrier 11 is used to carry and limit the screen 17 to be tested to facilitate other structures to detect the screen 17 to be tested. In addition, since the screen 17 to be tested is positioned by the screen carrier 11, the positioning between the first detector 12 and the screen 17 to be tested can be accurately ensured, thereby avoiding introduction of interference during detection, thereby improving the accuracy of detection of the screen 17 to be tested. .

The reflecting member 13 is movably disposed on the supporting portion, and has two working states of a working position and a deviation from the working position. When moving to the working position, at least part of the light emitted from the front surface of the screen 17 to be tested may be reflected to the first detector 12 . . The first detector 12 can detect the light intensity of the back surface of the screen 17 to be tested when the reflector 13 is offset from the working position (ie, the first light leakage intensity) and the light intensity of the back surface of the screen 17 to be tested when the reflector 13 is in the working position (ie, the second light leakage intensity) Therefore, the back light leakage ratio of the screen 17 to be tested can be obtained by the first light leakage intensity and the second light leakage intensity, and the accuracy and consistency of the detection are better.

In order to improve the accuracy of the detection and the detection efficiency and reduce the manual intervention, the screen detecting device further includes an electronic control unit (not shown), and the electronic control unit is disposed in the housing 22 for powering the screen detecting device. Partially powered, and receiving, transmitting, and/or processing signals and/or data, and the like.

The casing 22 can be used not only for mounting the electronic control portion but also as a part of the support portion, which can support the structure of the screen loading platform 11 and the like. Of course, in addition to the case 22, the support portion may include other structures capable of supporting and carrying functions. For example, the support portion further includes a mounting plate or the like connected to the case 22. In order to prevent the reflection of the components such as the casing 22 from adversely affecting the detection, all the structures of the screen detecting device are blackened except for the necessary structure.

The electronic control unit includes at least a power source and a controller. Among them, 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 preset to receive and read the parameters transmitted by each component, the signal command, the parameter algorithm, the data storage record command, the human-computer interaction command, the drive control other structure instructions, and the like. For example, the controller may execute preset instructions therein to control the first detector 12 to perform detection, and may receive and process data detected by the first detector 12. The controller can also control the movement of the reflector 13 to move the reflector 13 to the working position or to the working position when needed. For convenience of explanation, the position deviating from the working position will hereinafter be referred to as the avoidance position.

It should be noted that any position other than the working position of the reflecting member 13 can be regarded as a avoiding position, that is, as long as the reflecting member 13 is out of the working position, it can be regarded as being in the avoiding position. In addition, the working position of the reflecting member 13 may be an area, and does not have to be a point.

By setting the controller to control the first detector 12 and the reflector 13, the automation of the screen detection device can be improved, the labor intensity of the manual detection can be reduced, and the consistency of each detection can be ensured, and the manual detection can be avoided. The problem of introducing different errors is introduced, so that the accuracy and consistency of the detection are better, and the recognition accuracy of the fingerprint recognition sensor and the screen is higher.

The structure of the first detector 12 and the reflector 13 will be specifically described below:

For those skilled in the art, it is possible to select any suitable form of the first detector 12 to detect the light leakage intensity on the back side of the screen 17 to be tested. For example, the first detector 12 can be a photosensor, or a fiber optic spectrometer or the like. When using a fiber optic spectrometer, the detected light 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 adopts a photoelectric sensor, the electronic control unit includes a sensor conditioning circuit and a data acquisition card. The sensor conditioning circuit is used to adjust an electrical signal output by the photoelectric sensor, and the data acquisition card is used for The electrical signal output by the photoelectric sensor is collected. The sampling rate of the data acquisition card can be adjusted according to the data precision of the demand, thereby improving or reducing the data precision. When the data accuracy is lowered, the data processing speed can be improved, and the detection efficiency is higher.

Optionally, in order to facilitate the replacement of the screen 17 to be tested and to 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 support through the first transmission component 19 . And can be moved in a vertical or horizontal direction by the first transmission assembly 19 to adjust the vertical or horizontal distance of the first detector 12 from the screen carrier 11. Thus, when the screen 17 to be tested is replaced, a sufficient distance between the first detector 12 and the screen 17 to be tested is provided, which is convenient for replacement and safety.

Optionally, in the embodiment, the first transmission assembly 19 includes a vertically disposed vertical slide rail 192, a first moving mounting plate 191 movably disposed on the vertical slide rail 192, and a driving member (in the figure) Not shown), the driving member may drive the first moving mounting plate 191 to be moved, and the first moving mounting plate 191 is provided with a first mounting barrel 23 for mounting the first detector 12, and the first detector 12 is disposed at the first installation Inside the barrel 23. The first mounting barrel 23 can provide a closed detection space for the first detector 12 to prevent ambient light from affecting the detection accuracy of the first detector 12. In addition, when the driving member drives the first moving mounting plate 191 to move, the first mounting barrel 23 and the first detector 12 therein may also move in the vertical direction along with the first moving mounting plate 191, thereby adjusting the first detection. The vertical distance between the device 12 and the screen 17 to be tested.

Of course, in other embodiments, in order to adjust the vertical distance between the first detector 12 and the screen 17 to be tested, the screen stage 11 can be connected to the box 22 through a structure such as a cylinder, so that the expansion and contraction of the cylinder can be adjusted. The distance between the screen 17 and the first detector 12 can be set, and the first detector 12 can be set to a structure that does not move. Or both the first detector 12 and the screen carrier 11 are in a movable setting.

Alternatively, since the reflecting member 13 moves between the working position and the retracting position, the reflecting member 13 can be coupled to the supporting portion through the second transmission assembly 20 and can be moved by the second transmission assembly 20 to The reflector 13 is moved to a working position or a escaping position.

For example, as shown in FIGS. 3 and 4, the reflecting member 13 may be a mirror. The second transmission assembly 20 includes a laterally disposed lateral slide rail, a second movable mounting plate and a drive member (not shown) movably disposed on the lateral slide rail, and a second movable mounting plate for mounting the reflective member 13 When the driving member drives the second moving mounting plate to move on the lateral rail, the reflecting member 13 moves accordingly.

Alternatively, in order to enhance the reflection effect, the reflecting member 13 is disposed in the second mounting barrel 25 and connected to the second moving mounting board through the second mounting barrel 25, so that the reflected light can be effectively restrained by the second mounting barrel 25.

In order to make the function of the screen detecting device more comprehensive, in addition to the screen detecting device in the embodiment, in addition to being able to detect the light leakage ratio of the screen 17 to be tested, the screen detecting device may further comprise an extinction ratio for measuring the screen 17 to be tested. The extinction ratio detecting unit further increases the detection function and the detection effect of the screen detecting device by providing the extinction ratio detecting unit, and reduces the equipment cost.

Since the outgoing light of the screen 17 to be tested is linearly polarized light, the fingerprint recognition effect of the screen optical fingerprint recognition module is better after the screen 17 to be tested is combined with the screen optical fingerprint recognition module. Therefore, in this embodiment, by determining the extinction ratio (ER) of the screen 17 to be tested, it is determined whether the exiting light of the screen 17 to be tested is linearly polarized light, thereby adjusting or selecting a matching fingerprint according to the actual extinction ratio of the screen 17 to be tested. Identify the parameters of the module to ensure fingerprint recognition.

Specifically, whether the emitted light of the screen 17 to be tested is linearly polarized light can be detected using a rotating polarizer, for example, rotating the linear polarizing plate by 180° or more above the screen to be tested, thereby obtaining the strongest light intensity Pmax and the weakest light. Strong Pmin, then the extinction ratio is obtained according to the extinction ratio calculation formula: ER=10*lg(Pmax/Pmin). Generally, when ER ≥ 12 dB, it can be considered that the outgoing light of the screen 17 to be tested is linearly polarized light.

Based on this, the extinction ratio detecting portion is disposed on the support portion corresponding to the placement structure 111, and is located on the same side of the screen stage 11 as the reflection member 13.

It is possible for a person skilled in the art to select any structure capable of detecting the extinction ratio as needed. For example, as shown in FIGS. 5 and 6, in the present embodiment, the extinction ratio detecting portion includes the second detector 14, the polarizing plate 15, and the driving unit 16.

The second detector 14 may be a photosensor, or other suitable structure, such as a fiber optic spectrometer, for detecting the intensity of the exiting light of 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 tested to perform polarization state detection on the outgoing light. The polarizer 15 is rotatable relative to the second detector 14 under the drive of the drive assembly 16.

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

The drive motor 161 serves as a power source that is disposed on the support portion. In order to improve the accuracy of the control, each of the driving members, the driving motor 161, and the like in the present embodiment is preferably a closed loop stepping motor. Correspondingly, the electronic control unit further includes a closed-loop stepping motor controller for controlling each driving member and the driving motor 161 and a driver thereof, and the controller is connected with the closed-loop stepping motor controller and the driver to control its operation or stop.

The mounting sleeve 162 is coupled to the output shaft of the driving motor 161 and is configured to dispose the polarizing plate 15 and is rotatable with the output shaft to drive the polarizing plate 15 thereon to rotate relative to the second detector 14, so that the second detector 14 is rotated. The polarization state of the light emitted from the screen 17 to be tested of the mobile phone can be collected during the rotation of the polarizing plate 15.

It should be noted 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 connector 18. Additionally, in order for the second detector 14 not to rotate with the mounting sleeve 162, the connector 18 is specifically disposed within the mounting sleeve 162 by a bearing, and the second detector 14 is further disposed on the connector 18.

Optionally, in the embodiment, the screen detecting device further includes a third detector 21 for detecting the intensity of the emitted light on the front side of the screen 17 to be tested, and the third detector 21 is disposed on the box 22 of the support portion, and The third detector 21 and the reflector 13 are located on the same side of the screen stage 11. The third detector 21 may be a photosensor or a fiber optic spectrometer or the like.

It should be noted that the spectral response range of each photosensor in this embodiment is preferably in the visible light range.

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

Based on the above screen detecting device, the process of detecting the screen 17 to be tested includes:

The screen 17 to be tested is placed at the placement structure 111 of the screen carrier 11 with its back side facing up, face down, and the black foam-removed area of the screen 17 to be tested is facing the first detector 12, in preparation Subsequent testing. Also, turn on the power to power the screen detection device.

After the screen detecting device is powered up, the controller controls the first detector 12 to move in the vertical direction to reach the detecting position. The controller controls the first detector 12, the second detector 14, and the third detector 21 to detect a dark background light intensity value, and uses the dark background light intensity value as a reference value. The conditioning circuit respectively connected to the first detector 12, the second detector 14, and the third detector 21 modulates the output signal indicating the dark background light intensity value, and then the high-precision data acquisition card sends the collected signal to the control. Device. The controller can process, display, store, etc. these signals.

After detecting the dark background light intensity value, the controller lights up 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 light leakage ratio is measured, when the reflecting member 13 is in the avoiding position, the controller causes the first detector 12 to detect the back light leakage intensity when the screen 17 to be tested is in a bright state, and the back light leakage intensity and the first detector 12 detect The difference between the dark background light intensity values is the first light leakage intensity on the back of the screen in the absence of front reflected light (referred to as P1). At this time, the light leakage on the back side of the screen 17 to be tested includes light reflected and scattered by the layers in the screen 17 to be tested.

The controller controls the reflector 13 to move to the working position, directly opposite the first detector 12, and measures the light leakage intensity of the back surface of the screen 17 to be tested after covering the reflector 13 through the first detector 12, the back light leakage intensity and the first detector The difference between the detected dark background light intensity values of 12 is the second light leakage intensity on the back of the screen in the case of front reflected light (indicated as P2). At this time, the light leakage on the back side of the screen 17 to be tested includes light reflected by at least a part of the reflecting member 13 in addition to the light reflected and scattered by the respective layers in the screen 17 to be tested. After the controller obtains the light intensity value P1 and the light intensity value P2, the light leakage ratio of the screen 17 to be tested can be calculated.

When detecting the extinction ratio, the controller controls the driving motor 161 to rotate, thereby causing the polarizing plate 15 (linear polarizing plate) to rotate at least 180° about the vertical axis. During the rotation of the polarizing plate 15, the second detector 14 collects the light intensity after passing through the polarizing plate 15 at intervals, and transmits the collected signals to the controller, and the controller determines from the acquired signals. The maximum light intensity value (denoted as Pmax) and the minimum light intensity value (denoted as Pmin), and the extinction ratio is calculated from the maximum light intensity value and the minimum light intensity value. The time interval between the two detections of the second detector 14 (ie, the foregoing period of time) may be set according to requirements, for example, 10 ms, 50 ms, 100 ms, etc., which is not limited in this embodiment of the present application. .

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

When the test is completed, the controller can control the reverse movement homing of the first transmission assembly 19, the second transmission assembly 20, and the drive motor for subsequent detection.

It should be noted that, in the above detection process, if any structure generates an abnormality or an alarm during the operation, the detection is terminated, and the first detector 12, the reflector 13 and the polarizing plate 15 are returned to the same position, and Get the individual data stores.

The screen detecting device can be applied to the screening of the abnormal screen in the screen, especially the OLED screen, or to the incoming detection of the OLED screen matched with the screen fingerprint recognition module, which can realize the optical screen parameter of the OLED screen. Automated testing helps improve the accuracy and consistency of screen optical parameter testing, eliminates experimental errors introduced by manual testing, improves OLED screen measurement efficiency, and improves the consistency of screen fingerprint module performance.

Embodiment 2

According to an embodiment of the present application, another screen detecting device is provided to detect an extinction ratio, including a support portion, a screen carrying table 11, and an extinction ratio detecting portion that detects an extinction ratio of the screen 17 to be tested, wherein the screen carrying table 11 is disposed on the support Above, and having a placement structure 111 carrying a screen 17 to be tested.

The screen detecting device can detect the extinction ratio of the screen 17 to be tested without manual intervention, avoiding manual detection of introduced errors, improving the accuracy of detection, and using the device for detecting, the consistency of each detection is better.

It is possible for a person skilled in the art to select any structure capable of detecting the extinction ratio as needed. For example, in the present embodiment, the extinction ratio detecting portion includes the second detector 14, the polarizing plate 15, and the driving unit 16.

The second detector 14 may be a photosensor or other suitable structure, such as a fiber optic spectrometer, for detecting the polarization state of the outgoing light of the screen 17 to be tested. The polarizing plate 15 needs to be disposed between the second detector 14 and the screen 17 to be tested, so that the second detector 14 collects the light intensity of the outgoing light of the screen 17 to be measured, thereby determining 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 manner, the drive assembly 16 includes a drive motor 161 and a mounting sleeve 162.

The mounting sleeve 162 is coupled to the output shaft of the driving motor 161 and is configured to dispose the polarizing plate 15 and is rotatable with the output shaft to drive the polarizing plate 15 thereon to rotate relative to the second detector 14, so that the second detector 14 is rotated. The light intensity in each direction of the polarized light of the emitted light can be collected during the rotation of the polarizing plate 15.

It should be noted that in order to enable the second detector 14 to detect the intensity of the polarized light in each direction, the second detector 14 is disposed in the mounting sleeve 162 through the connector 18. Additionally, in order for the second detector 14 not to rotate with the mounting sleeve 162, the connector 18 is specifically disposed within the mounting sleeve 162 by a bearing, and the second detector 14 is further disposed on the connector 18.

Optionally, in order to improve the automation degree of the screen detecting device and reduce the labor intensity, the screen detecting device further includes an electronic control portion, and the electronic control portion is disposed in the casing 22. The electronic control unit is used for electrically connecting with other structures of the screen detecting device to realize data receiving, transmitting, and processing, thereby realizing automatic screen detection.

In this embodiment, the electronic control unit includes at least a power source and a controller, and the power source supplies power to other structures. The controller is connected to other structures and controls other structures. For example, the controller is coupled to the second detector 14, and acquires signals and data detected by the second detector 14, and processes the collected data. The controller is coupled to the drive motor 161 to cause it to rotate or stop.

When detecting the extinction ratio, the controller controls the driving motor 161 to rotate, thereby causing the polarizing plate 15 (linear polarizing plate) to rotate at least 180° about the vertical axis. During the rotation of the polarizing plate 15, the second detector 14 collects the light intensity after passing through the polarizing plate 15 at intervals, and transmits the collected signals to the controller, and the controller determines from the acquired signals. The maximum light intensity value (denoted as Pmax) and the minimum light intensity value (denoted as Pmin), and the extinction ratio is calculated from the maximum light intensity value and the minimum light intensity value.

The screen detecting device can include only the extinction ratio detecting portion as compared with the first embodiment. When the extinction ratio detecting is possible, the device volume can be reduced, the device weight can be reduced, and the device can be more easily transported. In addition, the screen detection device can also automatically test the optical screen parameters of the OLED screen, which helps to improve the accuracy and consistency of the screen optical parameter test, eliminates the experimental error introduced by the manual test, improves the efficiency of the OLED screen, and improves the efficiency of the OLED screen. The performance of the fingerprint module under the screen is consistent.

Embodiment 3

As shown in FIG. 7, according to an embodiment of the present application, a screen detecting method is provided, which detects a screen 17 to be tested by the screen detecting device in Embodiment 1.

The screen detecting method of this embodiment includes the following steps:

S101: Make the screen 17 to be tested in a bright screen state.

The controller can energize the screen 17 to be tested through the screen driving module to illuminate the screen to make it appear bright.

S102: When the reflector 13 is offset from the working position (ie, in the avoidance position), the first light leakage intensity of the back surface of the screen 17 to be tested is detected by the first detector 12.

When the first light leakage intensity is used to indicate that the screen 17 to be tested is in a bright screen state and the light is not reflected by the reflector 13, the screen 17 to be tested removes the light intensity of the area of the black foam on the back side (from the area where the black foam on the back side is removed) The emitted light can be called light leakage).

The first detector 12 may be a photoelectric sensor, and the controller may control the first detector 12 to detect the intensity of the backlight light when the screen 17 to be tested is in a bright state, thereby obtaining the first light leakage intensity.

In this embodiment, the first light leakage intensity (referred to as P1) may be a dark background value (referred to as P10) detected by the first detector 12 when the screen 17 to be tested is not in a bright screen state, and the screen 17 to be tested is bright. The difference between the back leakage light intensity (indicated as P11) detected by the first detector 12 when the screen is in the state of no reflection by the reflector 13 can be expressed as P1 = P11 - P10.

S103: When the reflector 13 is in the working position, the second light leakage intensity of the back surface of the screen 17 to be tested is detected by the first detector 12.

The controller can control the movement of the reflecting member 13 such that when the reflecting member 13 moves to the working position of the first detector 12 in the vertical direction, it reflects the light emitted from the front side of the screen 17 to be tested, at least a part of which reflects the light. The controller can control the first detector 12 to detect the back light intensity of the screen 17 to be tested at this time, thereby obtaining the second light leakage intensity of the back surface of the screen 17 to be tested.

The second light leakage intensity (referred to as P2) may be a dark background value (referred to as P10) detected by the first detector 12 when the screen 17 to be tested is not in a bright screen state, and the screen 17 to be tested is in a bright screen state and has a reflective member. The difference in light intensity (indicated as P21) of the back light detected by the first detector 12 when the reflected light is 13 can be expressed as: P2 = P21 - P10.

S104: Determine a light leakage ratio of the screen 17 to be tested according to the first light leakage intensity and the second light leakage intensity.

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

It should be noted that although in the present embodiment, the first light leakage intensity is detected before the second light leakage intensity is detected for convenience of explanation, those skilled in the art should understand that the first light leakage intensity and the second light leakage intensity are The detection order is not limited to the order of the embodiment. In other embodiments, the second light leakage intensity may be detected first, and then the first light leakage intensity may be detected.

The screen detection method can automatically detect the light leakage ratio of the screen 17 to be tested. Compared with the manual detection, the screen detection method can reduce the labor intensity, improve the accuracy and consistency of the detection, and can avoid the error introduced by the manual detection.

Optionally, when it is required to detect the extinction ratio, the screen detection method may further include the following steps:

S105: Rotating the polarizing plate 15 by a preset angle, wherein the preset angle has a value ranging from greater than or equal to the set angle value.

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

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

S106: During the rotation of the polarizing plate 15, the first outgoing light intensity of the screen 17 to be tested is detected by the second detector 14 every predetermined time interval, wherein the first outgoing light intensity is used to indicate after passing through the polarizing plate 15. The light intensity of the front side of the screen 17 to be tested is emitted.

During the rotation of the polarizing plate 15, the second detector 14 can detect the intensity of the light emitted from the screen 17 to be tested after passing through the polarizing plate 15 every time a predetermined time is under the control of the controller, thereby obtaining more The first outgoing light intensity.

The preset time can be set according to the need, and the controller can also adjust the sampling rate of the high-precision data acquisition card to adjust the sampling rate of the signal of the second detector 14 to adjust the preset time.

S107: Determine a maximum outgoing light intensity and a minimum outgoing light intensity among all the first outgoing light intensities.

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

S108: Determine an extinction ratio of the screen 17 to be tested according to the maximum outgoing light intensity and the minimum outgoing light intensity.

The controller determines the extinction ratio according to the extinction ratio calculation formula, the maximum exiting light intensity and the minimum exiting light intensity, and the extinction ratio is calculated as: ER=10*lg(Pmax/Pmin).

Optionally, when it is required to detect the absolute light intensity of the outgoing light of the screen 17 to be tested, the method further includes the following steps:

S109: The absolute intensity of the front exit light of the screen 17 to be tested is detected by the third detector 21.

The absolute intensity of the light emitted from the front side of the screen 17 to be tested is directly detected by a third detector disposed on the front side of the screen 17 to be tested.

Through the screen detection method, the screen detection device can be used to realize automatic screen detection, which improves the accuracy and consistency of the screen optical parameter test, and improves the efficiency of the optical parameter test.

Embodiment 4

As shown in FIG. 8, according to an embodiment of the present application, another screen detecting method is provided. The method detects the screen 17 to be tested by the screen detecting device in the second embodiment.

The screen detection method includes the following steps:

S201: The screen 17 to be tested is made to be in a bright screen state.

The controller can energize the screen 17 to be tested through the screen driving module to illuminate the screen to make it appear in a bright state.

S202: Rotating the polarizing plate 15 by a preset angle, wherein the preset angle has a value ranging from greater than or equal to the set angle value.

S203: During the rotation of the polarizing plate 15, the first outgoing light intensity of the screen 17 to be tested is detected by the second detector 14 every predetermined time interval, wherein the first outgoing light intensity is used to indicate after passing through the polarizing plate 15. The light intensity of the front side of the screen 17 to be tested is emitted.

S204: Determine a maximum outgoing light intensity and a minimum outgoing light intensity among all the first outgoing light intensities.

S205: Determine an extinction ratio of the screen 17 to be tested according to the maximum outgoing light intensity and the minimum outgoing light intensity.

It should be noted that the above embodiments are only used to explain the technical solutions of the embodiments of the present application, and are not limited thereto; although the embodiments of the present application are described in detail with reference to the foregoing embodiments, those skilled in the art should understand The technical solutions described in the foregoing embodiments may be modified, or some of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present application. Spirit and scope.

Claims

A screen detecting device includes a supporting portion, and the supporting portion is provided with a screen carrying platform (11), a first detector (12) and a reflecting member (13);

The screen carrier (11) is located between the reflector (13) and the first detector (12), and has a placement structure (111) carrying the screen to be tested (17);

The reflecting member (13) is relatively movable with the first detector (12), and when the reflecting member (13) is in its working position, at least part of the light reflected from the front surface of the screen to be tested (17) is reflected. To the first detector (12);

The first detector (12) is configured to detect a first light leakage intensity and a second light leakage intensity, wherein the first light leakage intensity and the second light leakage intensity are used to determine a light leakage ratio of the screen to be tested, wherein the first light leakage The intensity is used to characterize the backside light intensity of the screen (17) to be tested when the reflector (13) is offset from the working position, and the second light leakage intensity is used to characterize the screen to be tested when the reflector (13) is in the working position ( 17) Back light intensity.
The screen detecting device according to claim 1, wherein the screen detecting device further comprises: an extinction ratio detecting portion for measuring an extinction ratio of the screen to be tested (17), the extinction ratio detecting portion corresponding to the A placement structure (111) is disposed on the support portion.
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), and the polarizing plate (15) is located in the Between the second detector (14) and the screen to be tested (17), the polarizer (15) is rotatable relative to the second detector (14) under the drive of the drive assembly (16).
The screen detecting device of claim 3, wherein the drive assembly (16) comprises:

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

Mounting sleeve (162), the mounting sleeve (162) is coupled to an output shaft of the drive motor (161), the polarizing plate (15) is disposed on the mounting sleeve (162), and The output shaft rotates relative to the second detector (14).
A screen detecting device according to claim 4, wherein said second detector (14) is disposed within said mounting sleeve (162) by a connector (18).
The screen detecting device according to claim 5, wherein said connecting member (18) is disposed in said mounting sleeve (162) by a bearing, and said second detector (14) is disposed at said connecting member ( 18) Upper.
The screen detecting device according to any one of claims 1 to 6, wherein the first detector (12) is coupled to the support portion by a first transmission component (19), and A drive assembly (19) is moved downward to adjust the distance between the first detector (12) and the screen carrier.
The screen detecting device according to any one of claims 1 to 6, wherein the reflecting member (13) is coupled to the support portion via a second transmission assembly (20), and is slidable in the second transmission The component (20) is moved downward to move the reflecting member (13) to the working position or the avoiding position.
The screen detecting device according to any one of claims 1 to 6, wherein the screen detecting device further comprises: a third detector (21) for detecting the intensity of the emitted light on the front side of the screen to be tested (17). The third detector (21) is disposed on the support portion, and the third detector (21) and the reflection member (13) are located on the same side of the screen carrier.
A screen detecting method for detecting a screen to be tested by the screen detecting device according to any one of claims 1 to 9, the method comprising:

Making the screen to be tested a bright screen state;

Detecting, by the first detector, a first light leakage intensity of a back surface of the screen to be tested when the reflector is offset from the working position;

When the reflective member is in the working position, detecting, by the first detector, a second light leakage intensity of the back surface of the screen to be tested;

And determining a light leakage ratio of the screen to be tested according to the first light leakage intensity and the second light leakage intensity.
The method of claim 10, wherein the method further comprises:

Rotating the polarizing plate by a preset angle, wherein the preset angle has a value range greater than or equal to the set angle value;

During the rotation of the polarizing plate, the first outgoing light intensity of the screen to be tested is detected by the second detector every time a predetermined time interval, wherein the first outgoing light intensity is used to indicate the polarization The intensity of the light emitted from the front side of the screen to be tested after the film;

Determining the maximum outgoing light intensity and the minimum outgoing light intensity from all of the first outgoing light intensities;

And determining an extinction ratio of the screen to be tested according to the maximum outgoing light intensity and the minimum outgoing light intensity.
The method of claim 11 wherein said set angle value has a value of 180°.
The method of claim 10, wherein the method further comprises:

The absolute intensity of the front exit light of the screen to be tested is detected by a third detector.