CN114460974A - Automatic leveling device and leveling method for large-size flat display screen - Google Patents

Automatic leveling device and leveling method for large-size flat display screen Download PDF

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Publication number
CN114460974A
CN114460974A CN202111622584.2A CN202111622584A CN114460974A CN 114460974 A CN114460974 A CN 114460974A CN 202111622584 A CN202111622584 A CN 202111622584A CN 114460974 A CN114460974 A CN 114460974A
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display screen
displacement sensor
platform
flat display
sample
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吕雄涛
孙焕宇
王狮凌
刘�东
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Jiaxing Research Institute of Zhejiang University
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Jiaxing Research Institute of Zhejiang University
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D3/00—Control of position or direction
    • G05D3/12—Control of position or direction using feedback

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  • General Physics & Mathematics (AREA)
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  • Automation & Control Theory (AREA)
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Abstract

The invention discloses an automatic leveling device and a leveling method for a large-size flat display screen, which comprises a sample leveling platform, a three-dimensional displacement platform and a controller, wherein the sample leveling platform is connected with the three-dimensional displacement platform; the sample adjusting platform is provided with a strip-shaped mounting seat, and the mounting seat is provided with a limiting groove; a spectrum confocal displacement sensor is arranged on the three-dimensional displacement platform, and the controller is respectively and electrically connected with the sample adjusting platform and the spectrum confocal displacement sensor; the sample leveling platform is used for adjusting two angles of pitching and rotating of the large-size flat display screen; the spectrum confocal displacement sensor is provided with three positioning points, connecting lines of the three positioning points form a right-angled triangle, a connecting line of the first positioning point and the second positioning point is parallel to the Y axis, and a connecting line of the second positioning point and the third positioning point is parallel to the X axis; and the controller receives the data of the spectral confocal displacement sensor and controls the pitching and rotating angles of the sample adjusting platform. The invention can realize non-contact, rapid and automatic leveling of the large-size flat display screen.

Description

Automatic leveling device and leveling method for large-size flat display screen
Technical Field
The invention belongs to the technical field of optics, and particularly relates to an automatic leveling device and method for a large-size flat display screen.
Background
Under the background of the demand that large-scale display devices such as full-color screens and transparent screens are developed towards a more gorgeous and vivid direction, the processing of display screens is also continuously developed towards the direction of large size and high flatness. Flat display screens, such as computer screens and advertisement screens, are one of the most commonly used display screens in display devices and play an irreplaceable role in daily life.
The size of the flat display screen is getting larger and larger, and the requirement for the flatness of the processed surface is getting higher and higher, so the detection technology of the large-size flat display screen faces more severe examination. At present, during the production process of a large-size flat display screen, the requirement on the flatness of the screen is higher than that of a small-size screen. On one hand, a large-size screen is easy to deform, and the body correspondingly assembled with the large-size screen cannot be well attached to the large-size screen after deformation, so that light leakage or damage and the like can be caused; on the other hand, the flatness detection of a large-size screen is a big problem, and if the screen deforms, even a small deformation can affect the use of a user. Therefore, the screen needs to be leveled in the production process, so that the detection is convenient, and the cutting is also convenient.
Chinese patent publication No. CN104907863A discloses a portable leveling device for planar optical elements, which includes an upper disc and a lower disc with a gap in the middle, the upper disc and the lower disc are connected through a locking screw and a tension spring, the locking screw penetrates through a platform and the lower disc at the edge of the upper disc, four vacuum adsorption air passages are arranged around the side surface of the upper disc, an annular air passage is arranged on the upper surface, an upper ball boss with a vacuum adsorption joint is fixed at the lower end, a lower ball recess is fixed at the upper end of the lower disc correspondingly, four mechanical clamping blocks are fixed above the annular air passage on the upper disc, four adjusting screws with adjusting nuts are arranged at the platform at the edge, and an insert ring for limiting the adjusting screws is arranged at the edge of the underground disc correspondingly. The device adopts two modes of vacuum adsorption and mechanical clamping to clamp workpieces, and can meet the clamping requirements of circular and square optical elements with various calibers.
Chinese patent publication No. CN110174759A discloses a portable leveling device on a microscope stage, which comprises a stage, a support layer, a support screw, a lifting control screw, and a base; the base can be placed on an objective table of a microscope and is vertical to the axis of the lifting control spiral; the supporting layer is collinear with the axis of the base; the lifting control screw is collinear with the axis of the supporting screw, the limiting hole is matched with the tail of the supporting screw, and the upper limiting step and the lower limiting step of the lifting control screw are respectively matched with the supporting layer and the base limiting hole and are limited.
However, the existing leveling devices are all directed to small-sized screens or elements, and cannot realize the automatic leveling device of large-sized flat display screens.
Disclosure of Invention
The invention provides an automatic leveling device and a leveling method for a large-size flat display screen, which can realize non-contact, quick and automatic leveling of the large-size flat display screen.
An automatic leveling device for a large-size flat display screen comprises a sample leveling platform, a three-dimensional displacement platform and a controller which are matched with each other;
the surface of the sample adjusting platform is provided with a strip-shaped mounting seat, the mounting seat is provided with a limiting groove, and the limiting groove is used for limiting and fixing a large-size planar display screen in the vertical direction; the three-dimensional displacement platform is provided with a spectrum confocal displacement sensor, and the controller is electrically connected with the sample adjusting platform and the spectrum confocal displacement sensor respectively;
the sample leveling table is used for adjusting two angles of pitching theta x and rotating theta y of the large-size plane display screen; the spectrum confocal displacement sensor is provided with three positioning points, connecting lines of the three positioning points form a right-angled triangle, a connecting line of the first positioning point and the second positioning point is parallel to the Y axis, and a connecting line of the second positioning point and the third positioning point is parallel to the X axis; and the controller receives the data of the spectral confocal displacement sensor and controls the pitching and rotating angles of the sample adjusting platform.
Furthermore, the mounting seat is provided with clamping mechanisms on two sides and two ends of the limiting groove. Through the cooperation of the clamping mechanism and the limiting groove, the large-size flat display screen can be stably arranged on the sample adjusting platform.
Furthermore, the groove depth of the limiting groove is 0.5-1.5 cm, and the groove wall of the limiting groove is provided with an elastic interlayer, so that the limiting groove can adapt to large-size flat display screens with different thicknesses, and meanwhile, hard contact with the lower part of the large-size flat display screen is avoided.
Furthermore, the spectrum confocal displacement sensor is a non-contact measurement sensor, and a linear distance between the large-size plane display screen and the sensor is obtained by adopting a coaxial confocal spectrum measurement principle; the measuring direction is the projection light direction of the spectrum confocal displacement sensor.
The invention also provides an automatic leveling device for the large-size flat display screen, which comprises the following steps of:
(1) installing a sample adjusting platform, a three-dimensional displacement platform and a controller, calibrating the spectrum confocal displacement sensor, and determining a distance difference value delta dy measured by a first positioning point and a second positioning point of the spectrum confocal displacement sensor and a distance difference value delta dx measured by the second positioning point and a third positioning point of the spectrum confocal displacement sensor in a leveling state;
(2) placing a large-size planar display screen to be leveled in a limiting groove of a sample adjusting platform, and ensuring that the large-size planar display screen to be leveled is perpendicular to a light path of a spectrum confocal displacement sensor;
(3) moving X, Y two shafts of the three-dimensional displacement platform to enable screen surface sampling points corresponding to three positioning points of the spectrum confocal displacement sensor to be all positioned on the surface of the large-size plane display screen;
(4) moving the Z axis of the three-dimensional displacement table, and acquiring the relative distance d between three sampling points on the large-size flat display screen and three corresponding positioning points by the controller1、d2、d3；
(5) The controller controls the sample adjusting platform to move along the pitching axis until | d is satisfied1-d2< Δ dy; and further controlling the sample leveling platform to move the rotating shaft until | d is satisfied2-d3|＜Δdx；
(6) If at this time | d1-d2If the value is more than delta dy, repeating the steps (4) to (5), and calculating the distance of three sampling points corresponding to each sampling point by the controller in real timeThe relative distance of the positioning points and the movement amount of the sample adjusting platform are corrected until | d is satisfied simultaneously1-d2|＜Δdy、|d2-d3If the value is less than delta dx, the automatic leveling of the large-size flat display screen is completed.
Due to the existence of errors, when the system is built, three positioning points of the spectrum confocal displacement sensor cannot be strictly ensured to be positioned in the same plane; therefore, before automatic leveling, the initial relative distances of the three positioning points of the spectral confocal displacement sensor need to be calibrated to obtain the relative position information of the three positioning points of the spectral confocal displacement sensor. If the relative positions of the three positioning points of the spectrum confocal displacement sensor are not changed, the calibration work is only required to be carried out when the system is used for the first time.
In the step (1), the calibration process of the spectral confocal displacement sensor is as follows:
(1-1) placing a screen for calibration in a limiting groove of a sample adjusting platform, and simultaneously matching with a clamping mechanism for further fixing;
(1-2) moving the three-dimensional displacement table to enable the spectrum confocal displacement sensor to be located within the working distance of the three-dimensional displacement table, and obtaining the relative distance between three sampling points on the large-size plane display screen and the spectrum confocal displacement sensor;
(1-3) moving the three-dimensional displacement table to enable the spectrum confocal displacement sensor to scan a section line of the large-size planar display screen along the X direction, and recording the relative distance d acquired by the spectrum confocal displacement sensor1During the scanning process d1Is recorded as Δ d1；
(1-4) rotating the rotating shaft of the sample adjusting platform, and repeating the step (1-3) until the maximum variation delta d1When the value is smaller than the set threshold value, the leveling calibration of the sample leveling platform in the rotating shaft direction is completed; the threshold value is determined according to the measurement precision of the spectrum confocal displacement sensor;
(1-5) moving the three-dimensional displacement table in the Y direction to enable the spectrum confocal displacement sensor to scan a section line of the large-size planar display screen along the Y direction, and performing the steps (1-3) to (1-4) until d is in the scanning process1Maximum amount of change Δ d of1Is less than setThreshold value, finishing the leveling calibration of the sample leveling platform in the direction of the pitching axis;
(1-6) recording the relative distance | d of three positioning points acquired by the spectral confocal displacement sensor at the moment1-d2|＝Δdy、|d2-d3And (4) finishing the calibration of the initial relative distance of three positioning points of the spectrum confocal displacement sensor.
And (2) when the large-size flat display screen to be leveled is placed in the limiting groove of the sample leveling platform, the surface of the large-size flat display screen is ensured to be placed perpendicular to the horizontal plane.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the mounting seat with the limiting groove is mounted on the sample adjusting platform, and meanwhile, the clamping mechanisms are arranged on two sides and two ends of the limiting groove and are matched with the limiting groove, so that the large-size flat display screen can be more stably fixed on the sample adjusting platform in the whole leveling process, and the error in the later leveling process is reduced.
2. The invention adopts a feedback method of the relative distance between the three positioning points of the spectrum confocal displacement sensor and the sampling point to carry out closed-loop adjustment, only one spectrum confocal displacement sensor is needed during leveling, and the precision of the spectrum confocal displacement sensor is very high, thereby greatly improving the precision of the system and reducing the cost of devices. .
Drawings
FIG. 1 is a schematic structural diagram of an automatic leveling device for a large-sized flat display screen according to the present invention;
FIG. 2 is another schematic view of an automatic leveling device for large-sized flat display screens according to the present invention;
FIG. 3 is a diagram illustrating the calibration of the initial relative distance (rotation direction) of the spectral confocal displacement sensor according to the present invention;
FIG. 4 is a diagram illustrating the calibration of the initial relative distance (pitch direction) of the spectral confocal displacement sensor according to the present invention;
FIG. 5 is a flow chart of an automatic leveling method for a large-sized flat display screen according to the present invention.
In the figure: 1-a spectral confocal displacement sensor; 2-large size flat display screen; 3-sample conditioning platform; 4-a first anchor point; 5-a second anchor point; 6-third anchor point.
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples, which are intended to facilitate the understanding of the invention without limiting it in any way.
As shown in fig. 1-4, the automatic leveling device for large-size flat display screen comprises a sample leveling platform 3, a three-dimensional displacement platform and a controller which are used in cooperation. The sample adjusting platform 3 is provided with a strip-shaped mounting seat 7, the mounting seat 7 is provided with a limiting groove 8, and the limiting groove 8 is used for limiting and fixing the large-size flat display screen 2; the three-dimensional displacement platform is provided with a spectrum confocal displacement sensor 1, and the controller is respectively electrically connected with the sample adjusting platform 3 and the spectrum confocal displacement sensor 1.
The sample adjusting platform 3 is used for adjusting two angles of pitch theta x and rotation theta y of the large-size flat display screen 2. The spectrum confocal displacement sensor 1 is provided with three positioning points, connecting lines of the three positioning points form a right triangle, as shown in fig. 2, a connecting line of a first positioning point 4 and a second positioning point 5 is parallel to the Y axis, and a connecting line of the second positioning point 5 and a third positioning point 6 is parallel to the X axis; the controller receives the data of the spectrum confocal displacement sensor 1 and controls the pitching and rotating angles of the sample adjusting platform 3.
In this case, the mount pad on the sample adjusting platform 3 is provided with clamping mechanisms on both sides and both ends of the limiting groove. The groove depth of the limiting groove is 1.0cm, and an elastic interlayer is arranged on the groove wall of the limiting groove.
The spectrum confocal displacement sensor 1 is a non-contact measurement sensor, and adopts a coaxial confocal spectrum measurement principle to obtain a linear distance between a large-size plane display screen and the sensor; the measuring direction is the projection light direction of the spectrum confocal displacement sensor 1.
Before leveling, the initial relative distances of three positioning points of the spectral confocal displacement sensor 1 are firstly calibrated, and the process is as follows:
step 1, as shown in fig. 3 (a), a large-size flat display screen 2 for calibration is fixed in a limiting groove 8 of a sample adjusting platform 3 through a clamping mechanism by adopting a vertical placing posture;
step 2, moving X, Y two shafts of the three-dimensional displacement platform to enable three sampling points of the spectrum confocal displacement sensor to be located on the surface of the plane display screen 2;
step 3, moving the Z axis of the three-dimensional displacement table to enable the spectrum confocal displacement sensor 1 to be located within the working distance, and obtaining the relative distance between three sampling points on the large-size plane display screen 2 and the spectrum confocal displacement sensor 1;
step 4, moving the three-dimensional displacement table, starting scanning from a first positioning point 4 to a second positioning point 5 of the spectrum confocal displacement sensor 1, and recording the relative distance d acquired by the laser displacement sensor1During the scanning process d1Is recorded as Δ d1；
Step 5, as shown in fig. 3 (b), the rotation axis of the sample adjustment platform 3 is rotated, and step 4 is repeated until the maximum variation Δ d1When the value is smaller than the set threshold value, the leveling calibration of the sample leveling platform 3 in the rotating shaft direction is completed;
and 6, as shown in (a) and (b) of FIG. 4, repeating the steps 4-5 between the second positioning point 5 and the third positioning point 6 until d is reached in the scanning process1Maximum amount of change Δ d of1When the value is smaller than the set threshold value, the leveling calibration of the sample leveling platform 3 in the pitch axis direction is completed;
step 7, recording the relative distance | d acquired by three positioning points of the spectral confocal displacement sensor1-d2|＝Δdy、|d2-d3And (4) finishing the calibration of the initial relative distance of three positioning points of the spectrum confocal displacement sensor.
As shown in fig. 5, the method for automatically leveling a large-sized flat display screen is as follows:
s01, fixing the large-size flat display screen 2 to be leveled on a limiting groove of the sample leveling platform 3 through a clamping mechanism by adopting a vertical placing posture;
s02, moving two shafts X, Y of the three-dimensional displacement table to enable all three sampling points of the spectrum confocal displacement sensor 1 to be located on the surface of the large-size plane display screen 2;
s03, moving the Z axis of the three-dimensional displacement table to make the three positioning points of the spectrum confocal displacement sensor all located within the working distance, and obtaining the relative distance d between the three sampling points on the large-size plane display screen 2 and the spectrum confocal displacement sensor1、d2、d3；
S04, the sample adjusting platform 3 moves the rotation axis theta y until | d is satisfied1-d2|＜Δdy；
S05, the sample adjusting platform 3 moves along the pitch axis theta x until | d is satisfied2-d3|＜Δdx；
S06, if so, | d1-d2If the | is more than the Δ dy, repeating the steps S04-S05, feeding back the relative distances of the three sampling points, and correcting the movement amount of the sample adjusting platform 3 until | d is satisfied simultaneously1-d2|＜Δdy、|d2-d3If the value is less than delta dx, the automatic leveling of the large-size flat display screen is completed.
The embodiments described above are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions and equivalents made within the scope of the principles of the present invention should be included in the scope of the present invention.

Claims (8)

1. An automatic leveling device for a large-size flat display screen is characterized by comprising a sample leveling platform, a three-dimensional displacement platform and a controller which are matched with each other;
the surface of the sample adjusting platform is provided with a strip-shaped mounting seat, the mounting seat is provided with a limiting groove, and the limiting groove is used for limiting and fixing a large-size flat display screen in the vertical direction; the three-dimensional displacement platform is provided with a spectrum confocal displacement sensor, and the controller is electrically connected with the sample adjusting platform and the spectrum confocal displacement sensor respectively;
the sample leveling table is used for adjusting two angles of pitching theta x and rotating theta y of the large-size plane display screen; the spectrum confocal displacement sensor is provided with three positioning points, connecting lines of the three positioning points form a right triangle, a connecting line of the first positioning point and the second positioning point is parallel to the Y axis, and a connecting line of the second positioning point and the third positioning point is parallel to the X axis; and the controller receives the data of the spectrum confocal displacement sensor and controls the pitching and rotating angles of the sample adjusting platform.
2. The automatic leveling device for large-sized flat display screens as claimed in claim 1, wherein the mounting base is provided with clamping mechanisms at both sides and ends of the limiting groove.
3. The automatic leveling device for large-sized flat display screens as claimed in claim 2, wherein the depth of the limiting groove is 0.5-1.5 cm, and the wall of the limiting groove is provided with an elastic interlayer.
4. The automatic leveling device for the large-size flat display screen according to claim 2, wherein the spectral confocal displacement sensor is a non-contact measurement sensor, and a linear distance between the large-size flat display screen and the sensor is obtained by adopting a coaxial confocal spectral measurement principle; the measuring direction is the projection light direction of the spectrum confocal displacement sensor.
5. An automatic leveling device for a large-size flat display screen, which is characterized by adopting the automatic leveling device for the large-size flat display screen as claimed in any one of claims 1 to 4, and comprises the following steps:
(1) installing a sample adjusting platform, a three-dimensional displacement platform and a controller, calibrating the spectrum confocal displacement sensor, and determining a distance difference value delta dy measured by a first positioning point and a second positioning point of the spectrum confocal displacement sensor and a distance difference value delta dx measured by the second positioning point and a third positioning point of the spectrum confocal displacement sensor in a leveling state;
(2) placing a large-size planar display screen to be leveled in a limiting groove of a sample adjusting platform, and ensuring that the large-size planar display screen to be leveled is perpendicular to a light path of a spectrum confocal displacement sensor;
(3) moving X, Y two shafts of the three-dimensional displacement platform to enable screen surface sampling points corresponding to three positioning points of the spectrum confocal displacement sensor to be all positioned on the surface of the large-size plane display screen;
(4) moving the Z axis of the three-dimensional displacement table, and acquiring the relative distance d between three sampling points on the large-size flat display screen and three corresponding positioning points by the controller1、d2、d3；
(5) The controller controls the sample adjusting platform to move along the pitching axis until | d is satisfied1-d2< Δ dy; and further controlling the sample leveling platform to move the rotating shaft until | d is satisfied2-d3|＜Δdx；
(6) If at this time | d1-d2If | is more than delta dy, repeating the steps (4) to (5), calculating the relative distance between the three sampling points and each positioning point in real time by the controller, and correcting the movement amount of the sample adjusting platform until | d is satisfied at the same time1-d2|＜Δdy、|d2-d3If the value is less than delta dx, the automatic leveling of the large-size flat display screen is completed.
6. The automatic leveling device for large-sized flat display screen according to claim 5, wherein in the step (1), the calibration process for the spectral confocal displacement sensor is as follows:
(1-1) placing a screen for calibration in a limiting groove of a sample adjusting platform, and meanwhile, matching with a clamping mechanism for further fixing;
(1-2) moving the three-dimensional displacement table to enable the spectrum confocal displacement sensor to be located within the working distance of the three-dimensional displacement table, and obtaining the relative distance between three sampling points on the large-size plane display screen and the spectrum confocal displacement sensor;
(1-3) moving the three-dimensional displacement table to enable the spectrum confocal displacement sensor to scan a section line of the large-size planar display screen along the X direction, and recording the relative distance d acquired by the spectrum confocal displacement sensor1During the scanning process d1Is recorded as Δ d1；
(1-4) rotating the rotating shaft of the sample adjusting platform, and repeating the step (1-3) until the maximum variation delta d1When the value is smaller than the set threshold value, the leveling calibration of the sample leveling platform in the rotating shaft direction is completed;
(1-5) moving the three-dimensional displacement table in the Y direction to enable the spectrum confocal displacement sensor to scan a section line of the large-size planar display screen along the Y direction, and performing the steps (1-3) to (1-4) until d is in the scanning process1Maximum amount of change Δ d of1When the value is smaller than the set threshold value, the leveling calibration of the sample leveling platform in the pitch axis direction is completed;
(1-6) recording the relative distance | d of three positioning points acquired by the spectral confocal displacement sensor at the moment1-d2|＝Δdy、|d2-d3And (4) finishing the calibration of the initial relative distance of three positioning points of the spectrum confocal displacement sensor.
7. The device for automatically leveling a large-sized flat display screen according to claim 6, wherein in the step (1-4), the threshold value is determined according to the measurement accuracy of the spectral confocal displacement sensor.
8. The automatic leveling device for the large-sized flat display screen according to claim 5, wherein in the step (2), when the large-sized flat display screen to be leveled is placed in the limiting groove of the sample leveling platform, the surface of the large-sized flat display screen is ensured to be placed perpendicular to the horizontal plane.
CN202111622584.2A 2021-12-28 2021-12-28 Automatic leveling device and leveling method for large-size flat display screen Pending CN114460974A (en)

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Application Number Priority Date Filing Date Title
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102338991A (en) * 2011-08-31 2012-02-01 合肥芯硕半导体有限公司 Prealignment method for laser displacement sensor control
CN103631098A (en) * 2013-12-23 2014-03-12 成都虹博宇光电科技有限公司 Photo-etching machine and non-contact type leveling and focusing system and method thereof
CN111257231A (en) * 2020-02-28 2020-06-09 浙江大学 Automatic leveling method for large-caliber planar optical element
CN111288933A (en) * 2020-02-28 2020-06-16 浙江大学 Automatic centering method for spherical or rotationally symmetric aspheric optical element

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102338991A (en) * 2011-08-31 2012-02-01 合肥芯硕半导体有限公司 Prealignment method for laser displacement sensor control
CN103631098A (en) * 2013-12-23 2014-03-12 成都虹博宇光电科技有限公司 Photo-etching machine and non-contact type leveling and focusing system and method thereof
CN111257231A (en) * 2020-02-28 2020-06-09 浙江大学 Automatic leveling method for large-caliber planar optical element
CN111288933A (en) * 2020-02-28 2020-06-16 浙江大学 Automatic centering method for spherical or rotationally symmetric aspheric optical element

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