WO2020087899A1 - 支撑治具及落球测试方法 - Google Patents

支撑治具及落球测试方法 Download PDF

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Publication number
WO2020087899A1
WO2020087899A1 PCT/CN2019/085589 CN2019085589W WO2020087899A1 WO 2020087899 A1 WO2020087899 A1 WO 2020087899A1 CN 2019085589 W CN2019085589 W CN 2019085589W WO 2020087899 A1 WO2020087899 A1 WO 2020087899A1
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Prior art keywords
glass cover
cover plate
platform
convex portion
protrusion
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English (en)
French (fr)
Inventor
王永青
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Publication of WO2020087899A1 publication Critical patent/WO2020087899A1/zh
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
    • G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks

Definitions

  • the invention relates to the field of display technology testing, in particular to a supporting jig and a ball drop testing method.
  • Thin film transistor is the current liquid crystal display (Liquid Crystal Display, LCD) and active matrix driven organic electroluminescence display device (Active Matrix Organic Light-Emitting The main driving element in Diode, AMOLED) is directly related to the display performance of the flat panel display device.
  • liquid crystal displays which include a liquid crystal display panel and a backlight module.
  • the working principle of the liquid crystal display panel is based on the thin film transistor array substrate (Thin Film Transistor Array Substrate, TFT Array Substrate) and the color filter (Color Filter, CF) liquid crystal molecules are poured in between the substrates, and pixel voltage and common voltage are applied to the two substrates respectively.
  • the electric field formed between the pixel voltage and the common voltage controls the rotation direction of the liquid crystal molecules to change the backlight module ’s
  • the light is transmitted out to produce the picture.
  • 3D curved display devices With the development of science and technology, flexible display devices show more and more extensive application prospects. The main advantage lies in its foldability, which can realize the diversification of products and achieve excellent display effect and appearance effect.
  • the currently popular three-dimensional (3D) curved display device represented by Samsung, is more and more accepted and imitated by the public.
  • 3D curved display devices are used in 3D glass covers.
  • the strength of the 3D glass cover is a very important technical indicator. In the product evaluation and production process, the strength needs to be tested, usually through the ball drop test.
  • the commonly used falling ball experiment adopts a falling ball tester.
  • the sample to be tested is placed on the instrument platform.
  • a steel ball of a specific size is selected to fall from a fixed height.
  • the impact is on the specified position of the 3D glass cover to be tested.
  • Observe the 3D glass cover Whether there will be damage to determine the strength of the 3D glass cover. Due to its non-flat shape, the 3D glass cover cannot be like the 2D glass cover (that is, the overall flat glass cover) or the 2.5D glass cover (that is, the edges are curved, and the other areas are flat glass covers) ) Placed directly on the test platform, it is necessary to design a special fixture for the 3D glass cover to support, otherwise the ball drop experiment of the 3D glass cover is unreliable and the test results are uncertain.
  • the purpose of the present invention is to provide a supporting jig, which can improve the reliability of the falling ball experiment of the glass cover plate and make the strength test result of the glass cover plate certain.
  • the object of the present invention is also to provide a ball drop test method, which can improve the reliability of the ball drop test of the glass cover plate and make the strength test result of the glass cover plate deterministic.
  • the present invention provides a supporting jig for ball drop test, including: a platform and a raised portion provided on the platform;
  • a glass cover plate is placed on the convex portion, and the edge of the glass cover plate coincides with the edge of the convex portion.
  • the shape of the raised portion is a rectangle with four corners that are arc-shaped and chamfered; the raised portion encloses a groove on the platform.
  • the glass cover plate is a 3D glass cover plate.
  • the width of the protrusion is 1-3 mm.
  • the supporting jig further includes a plurality of limit stoppers disposed around the protrusion; the height of the limit stop is greater than the height of the protrusion for resisting the glass cover.
  • the invention also provides a ball drop test method, which includes the following steps:
  • Step S1 providing a supporting jig; the supporting jig includes a platform and a raised portion provided on the platform;
  • Step S2 Place the glass cover on the convex portion, the edge of the glass cover coincides with the edge of the convex portion;
  • Step S3 The ball is dropped from a fixed height and impacted on the glass cover to be tested for strength.
  • the shape of the raised portion is a rectangle with four corners that are arc-shaped and chamfered; the raised portion encloses a groove on the platform.
  • the glass cover plate is a 3D glass cover plate.
  • the width of the protrusion is 1-3 mm.
  • the supporting jig further includes a plurality of limit stoppers disposed around the protrusion; the height of the limit stop is greater than the height of the protrusion for resisting the glass cover.
  • the supporting jig of the present invention is used for ball drop testing, and includes a platform and a raised portion provided on the platform; the raised portion is used to place a glass cover plate, and the glass cover plate The edge coincides with the edge of the convex part.
  • the glass cover plate can be placed on the support jig very smoothly.
  • the strength needs to be tested when it hits the glass cover plate.
  • the position of the glass cover plate is placed on the supporting fixture very smoothly, which can improve the reliability of the ball drop test of the glass cover plate and make the strength test results of the glass cover plate deterministic.
  • the ball drop test method of the invention can improve the reliability of the ball drop test of the glass cover plate, and make the strength test result of the glass cover plate deterministic.
  • FIG. 1 is a schematic structural view of the supporting jig of the present invention.
  • FIG. 2 is a flowchart of the ball drop test method of the present invention.
  • the present invention provides a supporting jig for ball drop testing, which includes: a platform 10 and a raised portion 20 provided on the platform 10;
  • a glass cover plate is placed on the raised portion 20, and the edge of the glass cover plate coincides with the edge of the raised portion 20.
  • the glass cover plate when the glass cover plate is subjected to a ball drop test, the glass cover plate is placed on the convex portion 20 of the supporting jig, and the edge of the glass cover plate coincides with the edge of the convex portion 20, that is, the glass cover plate It can be placed on the support jig very smoothly.
  • the glass cover is placed on the support jig very smoothly, which can improve the glass cover
  • the reliability of the ball drop test of the board makes the strength test results of the glass cover plate deterministic.
  • the shape of the convex portion 20 is a rectangle with four corners that are arc-shaped and chamfered.
  • the protrusion 20 forms a groove 30 on the platform 10.
  • the glass cover plate is a 3D glass cover plate, that is, the entire surface of the glass substrate is a curved surface.
  • the supporting jig of the present invention can also be used to place a 3D display module (that is, the assembly of a 3D glass cover plate and a flexible display module).
  • the materials of the platform 10 and the raised portion 20 are acrylic or phenolic plastic, instead of using high-hardness materials such as metals or alloys, so as to reduce the impact of the ball drop test on the supporting fixture and extend the service life.
  • the width of the convex portion 20 is 1-3 mm (that is, the width of the contact surface between the convex portion 20 and the platform 10 is 1-3 mm).
  • the support jig can bear The greater the impact energy, the width of the protrusion 20 is preferably 1 mm, the maximum stress when the supporting jig is impacted is relatively small, and the service life is extended.
  • the height of the convex portion 20 (that is, the depth of the groove 30) should be smaller than the deformation caused by the ball impact of the glass cover plate, so that the glass cover plate will not contact with the inside of the groove 30 when deformed, and improve Reliability of the falling ball experiment of the glass cover.
  • the support jig further includes a plurality of limit stops 40 disposed around the protrusion 20, and the height of the limit stop 40 is greater than the height of the protrusion 20 to resist the glass cover, The position of the glass cover plate is fixed, and the surface of the protrusion 20 is in good contact, and the glass cover plate is not moved by the force of the impact of the ball.
  • the number of the limit stops 40 is four, and the four limit stops 40 are respectively located on the four sides of the protrusion 20.
  • the present invention also provides a ball drop test method, which includes the following steps:
  • Step S1 providing a supporting jig; the supporting jig includes a platform 10 and a protrusion 20 provided on the platform 10;
  • Step S2 Place the glass cover on the protrusion 20, and the edge of the glass cover coincides with the edge of the protrusion 20;
  • Step S3 The ball is dropped from a fixed height and impacted on the glass cover to be tested for strength.
  • the glass cover plate when the glass cover plate is subjected to a ball drop test, the glass cover plate is placed on the convex portion 20 of the supporting jig, and the edge of the glass cover plate coincides with the edge of the convex portion 20, that is, the glass cover plate It can be placed on the support jig very smoothly.
  • the glass cover is placed on the support jig very smoothly, which can improve the glass cover.
  • the reliability of the ball drop test of the board makes the strength test results of the glass cover plate deterministic.
  • the shape of the convex portion 20 is a rectangle with four corners that are arc-shaped and chamfered.
  • the protrusion 20 forms a groove 30 on the platform 10.
  • the glass cover plate is a 3D glass cover plate, that is, the entire surface of the glass substrate is a curved surface.
  • the supporting jig of the present invention can also be used to place a 3D display module (that is, the assembly of a 3D glass cover plate and a flexible display module), that is, the falling ball test method of the present invention can also be used to test the falling ball of a 3D display module .
  • the materials of the platform 10 and the raised portion 20 are acrylic or phenolic plastic, instead of using high-hardness materials such as metals or alloys, so as to reduce the impact of the ball drop test on the supporting fixture and extend the service life.
  • the width of the convex portion 20 is 1-3 mm (that is, the width of the contact surface between the convex portion 20 and the platform 10 is 1-3 mm).
  • the support jig can bear The greater the impact energy, the width of the protrusion 20 is preferably 1 mm, the maximum stress when the supporting jig is impacted is relatively small, and the service life is extended.
  • the height of the convex portion 20 (that is, the depth of the groove 30) should be smaller than the deformation caused by the ball impact of the glass cover plate, so that the glass cover plate will not contact with the inside of the groove 30 when deformed, and improve Reliability of the falling ball experiment of the glass cover.
  • the support jig further includes a plurality of limit stops 40 disposed around the protrusion 20, and the height of the limit stop 40 is greater than the height of the protrusion 20 to resist the glass cover, The position of the glass cover plate is fixed, and the surface of the protrusion 20 is in good contact, and the glass cover plate is not moved by the force of the impact of the ball.
  • the number of the limit stops 40 is four, and the four limit stops 40 are respectively located on the four sides of the protrusion 20.
  • the supporting jig of the present invention is used for ball drop testing, and includes a platform and a convex portion provided on the platform; the convex portion is used for placing a glass cover plate, and an edge of the glass cover plate It coincides with the edge of the convex part.
  • the glass cover plate can be placed on the support jig very smoothly.
  • the ball starts to fall from a fixed height, impact on the glass cover plate needs to be tested for strength Position, because the glass cover is placed on the support jig very steadily, it can improve the reliability of the ball drop test of the glass cover and make the strength test results of the glass cover certain.
  • the ball drop test method of the invention can improve the reliability of the ball drop test of the glass cover plate, and make the strength test result of the glass cover plate deterministic.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

一种支撑治具及落球测试方法。该支撑治具用于落球测试，包括平台（10）以及设于所述平台（10）上的凸起部（20）；所述凸起部（20）上用于放置玻璃盖板，所述玻璃盖板的边缘与凸起部（20）的边缘重合，在对玻璃盖板进行落球测试时，玻璃盖板可以很平稳的放置在支撑治具上，当球从固定高度开始下落，冲击到玻璃盖板上需测试强度的位置，由于玻璃盖板很平稳的被置于支撑治具上，可以提高玻璃盖板的落球实验的可靠性，使玻璃盖板的强度测试结果具有确定性。

Description

支撑治具及落球测试方法 技术领域
本发明涉及显示技术测试领域，尤其涉及一种支撑治具及落球测试方法。
 背景技术
薄膜晶体管（Thin Film Transistor，TFT）是目前液晶显示装置（Liquid Crystal Display，LCD）和有源矩阵驱动式有机电致发光显示装置（Active Matrix Organic Light-Emitting Diode，AMOLED）中的主要驱动元件，直接关系平板显示装置的显示性能。
现有市场上的液晶显示器大部分为背光型液晶显示器，其包括液晶显示面板及背光模组（backlight module）。液晶显示面板的工作原理是在薄膜晶体管阵列基板（Thin Film Transistor Array Substrate，TFT Array Substrate）与彩色滤光片（Color Filter，CF）基板之间灌入液晶分子，并在两片基板上分别施加像素电压和公共电压，通过像素电压和公共电压之间形成的电场控制液晶分子的旋转方向，以将背光模组的光线透射出来产生画面。
随着科技发展，柔性显示装置展现出越来越广泛的应用前景。主要优势在于其可绕折性，可实现产品的多样化，达到出色的显示效果和外观效果。如当前流行的三维（3D）曲面显示装置，以三星为代表，整体为弧面的3D显示屏越来越被大众接受和效仿。3D曲面显示装置都会运用到3D玻璃盖板。而3D玻璃盖板的强度是一项非常重要的技术指标。在产品评价和生产过程中，需要对强度进行检测，一般通过落球实验进行检定。
常用的落球实验采用落球测试仪，将待测样品置于仪器平台上，选用特定规格大小的钢球，从固定高度开始下落，冲击在3D玻璃盖板需测试的指定位置，观察3D玻璃盖板是否会有破损，以判断3D玻璃盖板的强度。由于3D玻璃盖板因其非平整的外形，而不能如2D玻璃盖板（即整体为平面的玻璃盖板）或2.5D玻璃盖板（即边缘为弧面，其他区域为平面的玻璃盖板）直接放置在测试平台上，因此需要设计3D玻璃盖板专用的治具进行支撑，否则3D玻璃盖板的落球实验不可靠，测试结果具有不确定性。
 技术问题
本发明的目的在于提供一种支撑治具，可以提高玻璃盖板的落球实验的可靠性，使玻璃盖板的强度测试结果具有确定性。
本发明的目的还在于提供一种落球测试方法，可以提高玻璃盖板的落球实验的可靠性，使玻璃盖板的强度测试结果具有确定性。
 技术解决方案
为实现上述目的，本发明提供了一种支撑治具，用于落球测试，包括：平台以及设于所述平台上的凸起部；
所述凸起部上用于放置玻璃盖板，所述玻璃盖板的边缘与凸起部的边缘重合。
所述凸起部的形状为四角呈弧形倒角的矩形；所述凸起部在平台上围成一凹槽。
所述玻璃盖板为3D玻璃盖板。
所述凸起部的宽度为1-3mm。
所述支撑治具还包括设于凸起部四周的多个限位挡块；所述限位挡块的高度大于凸起部的高度以用于抵挡玻璃盖板。
本发明还提供一种落球测试方法，包括如下步骤：
步骤S1、提供支撑治具；所述支撑治具包括平台以及设于所述平台上的凸起部；
步骤S2、将玻璃盖板放置在凸起部上，所述玻璃盖板的边缘与凸起部的边缘重合；
步骤S3、将球从固定高度下落，冲击到玻璃盖板上需测试强度的位置。
所述凸起部的形状为四角呈弧形倒角的矩形；所述凸起部在平台上围成一凹槽。
所述玻璃盖板为3D玻璃盖板。
所述凸起部的宽度为1-3mm。
所述支撑治具还包括设于凸起部四周的多个限位挡块；所述限位挡块的高度大于凸起部的高度以用于抵挡玻璃盖板。
 有益效果
本发明的有益效果：本发明的支撑治具用于落球测试，包括平台以及设于所述平台上的凸起部；所述凸起部上用于放置玻璃盖板，所述玻璃盖板的边缘与凸起部的边缘重合，在对玻璃盖板进行落球测试时，玻璃盖板可以很平稳的放置在支撑治具上，当球从固定高度开始下落，冲击到玻璃盖板上需测试强度的位置，由于玻璃盖板很平稳的被置于支撑治具上，可以提高玻璃盖板的落球实验的可靠性，使玻璃盖板的强度测试结果具有确定性。本发明的落球测试方法，可以提高玻璃盖板的落球实验的可靠性，使玻璃盖板的强度测试结果具有确定性。
 附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为本发明的支撑治具的结构示意图；
图2为本发明的落球测试方法的流程图。
 本发明的实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1，本发明提供一种支撑治具，用于落球测试，包括：平台10以及设于所述平台10上的凸起部20；
所述凸起部20上用于放置玻璃盖板，所述玻璃盖板的边缘与凸起部20的边缘重合。
需要说明的是，在对玻璃盖板进行落球测试时，将该玻璃盖板放置在支撑治具的凸起部20上，玻璃盖板的边缘与凸起部20的边缘重合，即玻璃盖板可以很平稳的放置在支撑治具上，当球从固定高度开始下落，冲击到玻璃盖板上需测试强度的位置，由于玻璃盖板很平稳的被置于支撑治具上，可以提高玻璃盖板的落球实验的可靠性，使玻璃盖板的强度测试结果具有确定性。
具体的，所述凸起部20的形状为四角呈弧形倒角的矩形。
进一步的，所述凸起部20在平台10上围成一凹槽30。
具体的，所述玻璃盖板为3D玻璃盖板，即玻璃基板的整个面为弧面。此外，本发明的支撑治具也可以用于放置3D显示模组(即3D玻璃盖板和柔性显示模组组立)。
具体的，所述平台10和凸起部20的材料均为亚克力或酚醛塑料，而不采用金属或合金等高硬度材料，以减少落球测试对支撑治具的冲击，延长使用寿命。
具体的，所述凸起部20的宽度为1-3mm（即凸起部20与平台10的接触面的宽度为1-3mm），由于凸起部20的宽度越窄，支撑治具可承受的冲击能量越大，那么凸起部20的宽度优选为1mm，支撑治具受到冲击时的最大应力相对较小，延长使用寿命。
具体的，所述凸起部20的高度（也就是凹槽30的深度）应该小于玻璃盖板受到球冲击产生的形变，使玻璃盖板产生形变时不会与凹槽30内部有接触，提高玻璃盖板的落球实验的可靠性。
具体的，所述支撑治具还包括设于凸起部20四周的多个限位挡块40，所述限位挡块40的高度大于凸起部20的高度以用于抵挡玻璃盖板，使玻璃盖板的位置固定，与凸起部20的表面接触良好，并且使玻璃盖板不会因为球的冲击受力而移动位置。
进一步的，所述限位挡块40的数量为四个，四个限位挡块40分别位于凸起部20的四个侧面。
请参阅图2，基于上述的支撑治具，本发明还提供一种落球测试方法，包括如下步骤：
步骤S1、提供支撑治具；所述支撑治具包括平台10以及设于所述平台10上的凸起部20；
步骤S2、将玻璃盖板放置在凸起部20上，所述玻璃盖板的边缘与凸起部20的边缘重合；
步骤S3、将球从固定高度下落，冲击到玻璃盖板上需测试强度的位置。
需要说明的是，在对玻璃盖板进行落球测试时，将该玻璃盖板放置在支撑治具的凸起部20上，玻璃盖板的边缘与凸起部20的边缘重合，即玻璃盖板可以很平稳的放置在支撑治具上，当球从固定高度开始下落，冲击到玻璃盖板上需测试强度的位置，由于玻璃盖板很平稳的被置于支撑治具上，可以提高玻璃盖板的落球实验的可靠性，使玻璃盖板的强度测试结果具有确定性。
具体的，所述凸起部20的形状为四角呈弧形倒角的矩形。
进一步的，所述凸起部20在平台10上围成一凹槽30。
具体的，所述玻璃盖板为3D玻璃盖板，即玻璃基板的整个面为弧面。此外，本发明的支撑治具也可以用于放置3D显示模组(即3D玻璃盖板和柔性显示模组组立)，即本发明的落球测试方法也可以用于3D显示模组的落球测试。
具体的，所述平台10和凸起部20的材料均为亚克力或酚醛塑料，而不采用金属或合金等高硬度材料，以减少落球测试对支撑治具的冲击，延长使用寿命。
具体的，所述凸起部20的宽度为1-3mm（即凸起部20与平台10的接触面的宽度为1-3mm），由于凸起部20的宽度越窄，支撑治具可承受的冲击能量越大，那么凸起部20的宽度优选为1mm，支撑治具受到冲击时的最大应力相对较小，延长使用寿命。
具体的，所述凸起部20的高度（也就是凹槽30的深度）应该小于玻璃盖板受到球冲击产生的形变，使玻璃盖板产生形变时不会与凹槽30内部有接触，提高玻璃盖板的落球实验的可靠性。
具体的，所述支撑治具还包括设于凸起部20四周的多个限位挡块40，所述限位挡块40的高度大于凸起部20的高度以用于抵挡玻璃盖板，使玻璃盖板的位置固定，与凸起部20的表面接触良好，并且使玻璃盖板不会因为球的冲击受力而移动位置。
进一步的，所述限位挡块40的数量为四个，四个限位挡块40分别位于凸起部20的四个侧面。
综上所述，本发明的支撑治具用于落球测试，包括平台以及设于所述平台上的凸起部；所述凸起部上用于放置玻璃盖板，所述玻璃盖板的边缘与凸起部的边缘重合，在对玻璃盖板进行落球测试时，玻璃盖板可以很平稳的放置在支撑治具上，当球从固定高度开始下落，冲击到玻璃盖板上需测试强度的位置，由于玻璃盖板很平稳的被置于支撑治具上，可以提高玻璃盖板的落球实验的可靠性，使玻璃盖板的强度测试结果具有确定性。本发明的落球测试方法，可以提高玻璃盖板的落球实验的可靠性，使玻璃盖板的强度测试结果具有确定性。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (10)

  1. 一种支撑治具，用于落球测试，包括：平台以及设于所述平台上的凸起部；
    所述凸起部上用于放置玻璃盖板，所述玻璃盖板的边缘与凸起部的边缘重合。
  2. 如权利要求1所述的支撑治具，其中，所述凸起部的形状为四角呈弧形倒角的矩形；所述凸起部在平台上围成一凹槽。
  3. 如权利要求1所述的支撑治具，其中，所述玻璃盖板为3D玻璃盖板。
  4. 如权利要求1所述的支撑治具，其中，所述凸起部的宽度为1-3mm。
  5. 如权利要求1所述的支撑治具，还包括设于凸起部四周的多个限位挡块；所述限位挡块的高度大于凸起部的高度以用于抵挡玻璃盖板。
  6. 一种落球测试方法，包括如下步骤：
    步骤S1、提供支撑治具；所述支撑治具包括平台以及设于所述平台上的凸起部；
    步骤S2、将玻璃盖板放置在凸起部上，所述玻璃盖板的边缘与凸起部的边缘重合；
    步骤S3、将球从固定高度下落，冲击到玻璃盖板上需测试强度的位置。
  7. 如权利要求6所述的落球测试方法，其中，所述凸起部的形状为四角呈弧形倒角的矩形；所述凸起部在平台上围成一凹槽。
  8. 如权利要求6所述的落球测试方法，其中，所述玻璃盖板为3D玻璃盖板。
  9. 如权利要求6所述的落球测试方法，其中，所述凸起部的宽度为1-3mm。
  10. 如权利要求6所述的落球测试方法，其中，所述支撑治具还包括设于凸起部四周的多个限位挡块；所述限位挡块的高度大于凸起部的高度以用于抵挡玻璃盖板。
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