Display screen bonding adhesive layer thickness detection method and display screen bonding process

Abstract

The present application relates to a kind of display screen laminating glue layer thickness detection method and display screen laminating process.The display screen laminating glue layer thickness detection method is used to detect the thickness of the laminating glue layer in the display screen plated with protective film layer.Detection method includes processing the surface of display screen, so that the surface of display screen is smooth;Light is emitted to the surface of display screen using thickness gauge;The light beam reflected by display screen is received;The thickness of the laminating glue layer is obtained based on the light beam reflected by display screen.Solve the problem that the surface of protective film is formed with multiple pits, so that the light emitted by thickness gauge cannot be reflected as concentrated light beam that can return to optical thickness gauge, and then the thickness of the laminating glue layer can be accurately obtained based on the light beam reflected by display screen, so that the error of the glue layer thickness value detected is smaller, and the operation is simple, so that the efficiency of display screen lamination and the yield of laminated finished product can be greatly improved.

Description

Technical Field

[0001] This invention relates to the field of display assembly technology, and in particular to a method for detecting the thickness of the adhesive layer for display screen bonding and a display screen bonding process. Background Technology

[0002] With the development of display technology, large-size touch displays are increasingly widely used in various devices with display functions. When a user approaches or touches the surface of the touch display with their finger or a conductive object, the touch position is sensed by changes in the internal circuitry or capacitance of the touch display, and a response is made. The structure of a common touch display is usually multi-layered, that is, multiple glass panels are bonded together with solid adhesive (for example, the touchpad and the LCD screen are bonded together), thus forming a touch-controlled LCD screen.

[0003] During the display screen mounting process, to ensure mounting quality, the adhesive layer between the touch panel and the LCD screen needs to be of relatively uniform thickness. A common inspection method is for operators to visually inspect the adhesive layer thickness, estimating its uniformity by eye. However, this visual inspection method often yields a large error in the adhesive layer thickness, making it difficult to control its uniformity. Another method is to use a micrometer to measure the thickness of each individual glass panel and record it. After mounting, the total thickness of the display screen is measured, and the adhesive layer thickness is obtained by subtracting the thickness of each individual glass panel from the total thickness of the display screen. This method is also cumbersome, inefficient, and has poor accuracy. Alternatively, a non-contact optical thickness gauge can be used instead of a micrometer for measurement. However, when a protective film is coated on the surface of the glass panel, the surface of the protective film has fine particles, which form multiple pits. When using a non-contact optical thickness gauge for measurement, the light emitted by the optical thickness gauge cannot be reflected into a focused beam that can return to the optical thickness gauge. This makes it impossible to use the optical thickness gauge to measure the thickness of the adhesive layer of this type of display screen. Summary of the Invention

[0004] Therefore, it is necessary to provide a method for detecting the thickness of the adhesive layer of a display screen and a display screen bonding process to address the aforementioned problems encountered in measuring the thickness of the adhesive layer of the display screen.

[0005] According to one aspect of this application, a method for detecting the thickness of a bonding adhesive layer in a display screen is provided, for detecting the thickness of a bonding adhesive layer in a display screen coated with a protective film layer, the detection method comprising:

[0006] Process the surface of the display screen to make the surface of the display screen smooth;

[0007] A thickness gauge is used to emit light onto the surface of the display screen;

[0008] Receives the light beam reflected by the display screen;

[0009] The thickness of the adhesive layer is obtained based on the light beam reflected by the display screen.

[0010] In one embodiment, the step of processing the surface of the display screen to smooth the surface of the display screen includes:

[0011] A filler layer is applied to the surface of the protective film layer to fill the pits on the surface of the protective film layer;

[0012] The filler layer is leveled using a scraper.

[0013] In one embodiment, the display screen includes at least two light-transmitting panels, which are bonded together by the adhesive layer. The protective film layer is coated on the outer surface of at least one of the light-transmitting panels. The filler layer is an optical adhesive, and the refractive index of the optical adhesive is equal to the refractive index of the light-transmitting panel coated with the protective film layer.

[0014] In one embodiment, after the step of obtaining the thickness of the adhesive layer based on the light reflected by the display screen, the method further includes:

[0015] Wipe away the filler layer coated on the surface of the protective film.

[0016] In one embodiment, after step : emitting light onto the surface of the display screen using a thickness gauge, and before step : receiving the light reflected by the display screen, the method further includes the step:

[0017] Adjust the distance between the thickness gauge and the surface of the display screen so that the light emitted by the thickness gauge is focused on a point on the surface of the display screen.

[0018] In one embodiment, the step of receiving the light beam reflected by the display screen includes:

[0019] Identify the different reflective surfaces on the adhesive layer when the light shines on them;

[0020] The return distance value of the light reflected by different reflective surfaces is obtained to the thickness gauge.

[0021] In one embodiment, the display screen includes a first light-transmitting panel and a second light-transmitting panel, the first light-transmitting panel and the second light-transmitting panel are bonded to each other by the adhesive layer, the surface of the second light-transmitting panel away from the adhesive layer is coated with the protective film layer, and the different reflective surfaces include a first reflective surface and a second reflective surface, the first reflective surface being the contact surface between the adhesive layer and the first light-transmitting panel, and the second reflective surface being the contact surface between the adhesive layer and the second light-transmitting panel;

[0022] In the step of obtaining the return distance values ​​of the light reflected by different reflective surfaces back to the thickness gauge, the return distance values ​​include a first return distance value and a second return distance value, wherein the first return distance value is the distance from the first reflective surface back to the thickness gauge, and the second return distance value is the distance from the second reflective surface back to the thickness gauge.

[0023] In one embodiment, in the step of obtaining the thickness of the adhesive layer based on the light reflected by the display screen, the thickness of the adhesive layer is calculated according to the formula: (D1-D2)×α;

[0024] Wherein, D1 is the first return distance value, D2 is the second distance return value, and α is the refractive index coefficient of the adhesive layer.

[0025] According to another aspect of this application, a display screen bonding process is provided, comprising:

[0026] The adhesive layer is coated on the surface of the first light-transmitting panel;

[0027] The second light-transmitting panel is placed on the adhesive layer so that the first light-transmitting panel and the second light-transmitting panel are bonded to each other.

[0028] The thickness of the adhesive layer was detected at different locations on the display screen using the detection method described above.

[0029] In one embodiment, after step: detecting the thickness of the adhesive layer at different locations on the display screen, the method includes:

[0030] Calculate the average value after multiple tests;

[0031] Based on the average value obtained after multiple tests, it is determined whether the thickness error of the adhesive layer is within the specified range. If the thickness error of the adhesive layer is within the specified range, the display screen is a qualified product.

[0032] The above-mentioned method for detecting the thickness of the adhesive layer for display screen bonding and the display screen bonding process including the detection method have the following technical advantages:

[0033] By processing the surface of the display screen to make it smooth, when light is emitted onto the surface of the display screen using an optical thickness gauge, the light is reflected by the smooth surface into a concentrated beam that returns to the thickness gauge. This allows for accurate measurement of the adhesive layer thickness based on the reflected beam, resulting in smaller errors in the measured adhesive layer thickness. The process is simple and significantly improves the efficiency and yield of display screen bonding. Furthermore, it solves the problem that when a protective film layer is applied to the display screen surface, multiple pits on the surface prevent the light emitted by the thickness gauge from being reflected into a concentrated beam that returns to the optical thickness gauge. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the display screen provided in an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the display screen bonding process provided for an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram illustrating the working principle of the thickness gauge in an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of light reflection on the untreated surface of the display screen in an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of light reflection on the surface of the display screen after treatment, as shown in an embodiment of the present invention.

[0040] Figure 6 A schematic diagram of the steps of a method for detecting the thickness of a display screen adhesive layer provided in an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram illustrating the working principle of using a thickness gauge to detect the thickness of the adhesive layer for a display screen, as provided in an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Display screen; 101. First reflective surface; 102. Second reflective surface; 103. Third reflective surface; 104. Fourth reflective surface; 110. First light-transmitting panel; 120. Second light-transmitting panel; 130. Adhesive layer; 200. Thickness gauge; 300. Reflected beam; 400. Filler layer; 500. Protective film layer. Detailed Implementation

[0044] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "level," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the liquid level of the first feature is higher than that of the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the liquid level of the first feature is lower than that of the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0050] An embodiment of the present invention provides a method for detecting the thickness of a bonding adhesive layer for a display screen and a display screen bonding process. The display screen bonding process includes a method for detecting the thickness of the bonding adhesive layer. The display screen bonding process is used to bond and assemble multiple light-transmitting panels (such as glass) to form a display screen. The method for detecting the thickness of the bonding adhesive layer is used to detect the thickness of the bonding adhesive layer after the light-transmitting panels are bonded, so as to check the uniformity of the bonding adhesive layer thickness.

[0051] The following describes the steps of the display screen bonding process and the method for detecting the thickness of the adhesive layer in this application, taking a display screen with two layers of light-transmitting panels as an example. This embodiment is only used as an example and does not limit the technical scope of this application. It is understood that in other embodiments, the display screen bonding process and the method for detecting the thickness of the adhesive layer in this application are not limited to bonding a display screen with two layers of light-transmitting panels and detecting the thickness of the adhesive layer. They can be used to bond a display screen with multiple layers of light-transmitting panels and detect the thickness of the adhesive layer. Furthermore, they can be used, but are not limited to, to detect the thickness of the adhesive layer in the display screen. The detection method disclosed in this application can also be used to detect the thickness of a single light-transmitting panel coated with a protective film layer or to detect the thickness of any type of light-transmitting panel with an uneven surface. No limitation is made here.

[0052] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

[0053] like Figure 1The diagram illustrates the structure of a display screen 100, comprising two light-transmitting panels: a first light-transmitting panel 110 and a second light-transmitting panel 120. As shown, the second light-transmitting panel 120 is disposed above the first light-transmitting panel 110 and bonded together with a transparent adhesive layer 130. In some embodiments, the first light-transmitting panel 110 may be a liquid crystal display (LCD), the second light-transmitting panel 120 may be a touch screen, and the adhesive layer 130 is a transparent solid adhesive, which may be in a liquid or semi-solid phase before curing.

[0054] It is understandable that the structure of the display screen 100 is not limited to the above structure, and it can also be composed of multiple light-transmitting panels bonded together by an adhesive layer 130. Figure 1 Taking the structure shown as an example, as Figure 2 As shown, its bonding process is as follows:

[0055] The first step is to apply an adhesive layer 130 to the surface of the first light-transmitting panel 110.

[0056] The second step is to cover the second light-transmitting panel 120 onto the adhesive layer 130 so that the first light-transmitting panel 110 and the second light-transmitting panel 120 are bonded to each other through the adhesive layer 130.

[0057] The third step is to test the thickness of the adhesive layer 130 at different positions on the display screen 100. The purpose is to check whether the thickness of the adhesive layer 130 is uniform, thereby ensuring the installation quality of the display screen 100.

[0058] The fourth step is to calculate the average value after multiple tests.

[0059] The fifth step is to determine whether the thickness error of the adhesive layer 130 is within the specified range based on the average value obtained after multiple tests. If the thickness error of the adhesive layer 130 is within the specified range, the display screen 100 is a qualified product.

[0060] For example, when the thickness of the adhesive layer 130 is 600μm, it is necessary to check whether the thickness of the adhesive layer 130 is uniform during the bonding process, and control the thickness error of the adhesive layer 130 within ±30μm.

[0061] However, as described in the background section, existing methods for detecting the thickness of the adhesive layer 130 typically involve visually inspecting the thickness by an operator, or performing multiple measurements using a micrometer or optical thickness gauge to determine uniformity. However, these methods have several drawbacks. For instance, visual inspection by an operator often results in significant errors in the measured thickness of the adhesive layer 130 due to the limited precision of visual observation. Micrometer measurement requires first measuring the thickness of a single glass panel, then the total thickness of the display screen 100, and finally subtracting the thickness of the single glass panel from the total thickness to obtain the adhesive layer 130 thickness. The cumbersome operation of a micrometer further complicates the measurement process. Therefore, methods such as… Figure 3 When the optical thickness gauge 200 is used for measurement, it emits light, such as infrared light or other visible light, onto the surface of the light-transmitting panel (e.g., a glass panel) to be measured. Part of the light is reflected by the upper surface of the light-transmitting panel as a concentrated beam and returns to the optical thickness gauge 200, resulting in a return distance value B. Another part of the light is refracted into the light-transmitting panel and reflected by the lower surface of the light-transmitting panel as another concentrated beam and returns to the optical thickness gauge 200, resulting in another larger return distance value A. The thickness of the light-transmitting panel can be calculated based on the difference between these two return distance values.

[0062] It is evident that although the optical thickness gauge 200 can measure thickness in a non-contact manner and its operation is simpler than that of a micrometer, it still has limitations. Figure 4 As shown, the glass panel of the display screen 100 is typically coated with an anti-glare protective film layer 500 (hereinafter referred to as the protective film layer 500) to protect the user's eyes. However, the surface of the protective film layer 500 has fine particles, thus forming multiple pits. In this case, when the thickness gauge 200 is used for measurement, the light emitted by the thickness gauge 200, such as infrared light, is scattered and reflected by the pits of the protective film when it shines on the surface of the protective film. It cannot be focused into a concentrated beam that can return to the thickness gauge 200, thus making it impossible to use the optical thickness gauge 200 to measure the thickness of the adhesive layer 130 in the display screen 100 coated with the protective film layer 500.

[0063] Based on the above considerations, in order to solve the problems of low efficiency and low accuracy in thickness detection of the adhesive layer 130 in the existing display screen 100 mounting process, and the inconvenience in detecting the display screen 100 with the protective film layer 500, the inventors of this application, after in-depth research, have designed a method for detecting the thickness of the adhesive layer 130 of the display screen 100 and a display screen 100 mounting process including this detection method. This involves treating the surface of the protective film layer 500, such as... Figure 5As shown, the surface of the protective film layer 500 is made smooth, so that the light emitted by the optical thickness gauge 200 can be reflected into a focused beam that returns to the thickness gauge 200. This allows the thickness gauge 200 to obtain the thickness of the protective film layer 500 based on the received focused beam. This enables operators to easily and accurately detect the thickness of the adhesive layer 130 using the thickness gauge 200, unaffected by the protective film layer 500 on the surface of the display screen 100.

[0064] The following combination Figure 6 and Figure 7 The method and steps for detecting the thickness of the adhesive layer 130 are explained.

[0065] S1. The surface of the display screen 100 is treated to make it smooth. Specifically, in this step, the display screen 100 is first placed on a flat tabletop with the side of the display screen 100 coated with the protective film layer 500 (for example, the protective film layer 500 is coated on the surface of the second light-transmitting panel 120) facing upwards. Then, a leveling layer 400 is applied to the surface of the protective film layer 500 to fill the pits on the surface of the protective film layer 500. Preferably, the leveling layer 400 is a liquid or semi-solid optical adhesive. The refractive index of the optical adhesive is equal to the refractive index of the second light-transmitting panel 120. For example, when the second light-transmitting panel 120 is glass, since the refractive index of glass is 1.51, an optical adhesive with the same refractive index of 1.51 and a viscosity of 55000 CP (a unit of viscosity, CP is centipoise) is selected. The reason for selecting an optical adhesive is that it is in a liquid or semi-solid phase, which makes it easy to wipe and clean. Then, use a scraper to scrape back and forth on the surface of the protective film layer 500 to smooth the filler layer 400, so that the side of the display screen 100 coated with the protective film layer 500 is smooth. The specific method is not limited.

[0066] Understandably, in this step, a layer of harder, translucent film can also be applied to the surface of the display screen 100 with the protective film layer 500, as long as the surface of the display screen 100 with the protective film layer 500 is smooth.

[0067] S2. The thickness gauge 200 emits light onto the surface of the display screen 100. The thickness gauge 200 can be a non-contact optical thickness gauge, and the emitted light can be infrared light.

[0068] S3. Adjust the distance between the thickness gauge 200 and the surface of the display screen 100. In this step, the purpose of adjusting the distance between the thickness gauge 200 and the surface of the display screen 100 is to adjust the focal length of the thickness gauge 200 so that the light emitted by the thickness gauge 200 is focused on a point on the surface of the display screen 100. This ensures that the thickness gauge 200 can fully receive the return value of the light in the subsequent steps.

[0069] S4. Receive the light beam reflected by the display screen 100. Since the surface with the protective film layer 500 has been treated in the previous steps to fill the pits on the surface of the protective film, when the light shines on the side of the display screen 100 with the protective film layer 500, the light actually shines directly on the filling layer 400. Therefore, part of the light is reflected by the filling layer 400 into a concentrated beam and returns to the thickness gauge 200, while the other part of the light shines through the filling layer 400 and the protective film layer 500 and enters the display screen 100. The adhesive layer 130 inside the display screen 100 and the contact surfaces of different light-transmitting panels all form reflective surfaces, and the light entering the display screen 100 will be reflected by different reflective surfaces.

[0070] To obtain the thickness of the adhesive layer 130, the thickness gauge 200 needs to identify the different reflective surfaces on the adhesive layer 130 when light shines on it. Specifically, as shown in the figure, the contact surface between the adhesive layer 130 and the first light-transmitting panel 110 (i.e., the lower surface of the adhesive layer 130 in the figure) is the first reflective surface 101, the contact surface between the adhesive layer 130 and the second light-transmitting panel 120 (i.e., the upper surface of the adhesive layer 130 in the figure) is the second reflective surface 102, the upper surface of the second light-transmitting panel 120 is the third reflective surface 103, and the lower surface of the first light-transmitting panel 110 is the fourth reflective surface 104. After the thickness gauge 200 emits light onto the display screen 100, the thickness gauge 200 can identify the different reflective surfaces. Then, the thickness gauge 200 can obtain the return distance values ​​of light reflected back to the thickness gauge 200 by different reflective surfaces. Taking the display screen 100 with two light-transmitting panels in the figure as an example, the return distance value of light reflected from the first reflective surface 101 to the thickness gauge 200 is the first return distance value, and the return distance value of light reflected from the second reflective surface 102 to the thickness gauge 200 is the second return distance value. Similarly, the return distance value of light reflected from the third reflective surface 103 to the thickness gauge 200 is the third return distance value, and the return distance value of light reflected from the fourth reflective surface 104 to the thickness gauge 200 is the fourth return distance value.

[0071] S5. Obtain the thickness of the adhesive layer 130 based on the light beam reflected by the display screen 100. In this step, the thickness of the adhesive layer 130 is calculated using the formula: (D1-D2)×α;

[0072] Where D1 is the first return distance value, D2 is the second distance return value, and α is the refractive index coefficient of the adhesive layer 130.

[0073] S6. After measuring the thickness of the adhesive layer 130 at multiple locations on the display screen 100, the filler layer 400 is wiped off with a cloth to restore the protective effect of the protective film layer 500.

[0074] Thus, by applying a leveling layer 400, such as optical adhesive, to the surface of the protective film layer 500 of the display screen 100, the pits on the surface of the protective film layer 500 are filled, making the surface of the display screen 100 smooth. This allows the light emitted by the optical thickness gauge 200 onto the surface of the display screen 100 to be reflected as a concentrated beam back to the thickness gauge 200. This enables the accurate measurement of the thickness of the adhesive layer 130 based on the beam reflected by the display screen 100, resulting in a smaller error in the measured thickness value. The operation is simple, and it solves the problem that when the surface of the protective film layer 500 is coated with multiple pits, the light emitted by the thickness gauge 200 cannot be reflected as a concentrated beam back to the optical thickness gauge 200. This significantly improves the bonding efficiency and yield of the display screen 100.

[0075] It should be noted that the thickness of either the first light-transmitting panel 110 or the second light-transmitting panel 120 can be measured using the above method. For example, when measuring the thickness of the first light-transmitting panel 110, based on the different reflective surfaces identified by the thickness gauge 200, it can be obtained using the formula (D4-D1)×β, where D4 is the fourth return distance value and β is the refractive index coefficient of the first light-transmitting panel 110. When measuring the thickness of the second light-transmitting panel 120, it can be obtained using the formula (D2-D3)×γ, where D3 is the third return distance value and γ is the refractive index coefficient of the second light-transmitting panel 120.

[0076] Finally, it should be noted that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above-described embodiments are merely one implementation of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for detecting the thickness of a display screen bonding adhesive layer, characterized in that, The application discloses a method for detecting the thickness of a bonding adhesive layer of a display screen plated with a protective film layer, the display screen comprising at least two light-transmitting panels bonded with each other through the bonding adhesive layer, and the protective film layer being plated on the outer surface of at least one of the light-transmitting panels; the method comprising the following steps: processing the surface of the display screen to make the surface of the display screen smooth; emitting light to the surface of the display screen by using a thickness gauge; receiving a light beam reflected by the display screen; and obtaining the thickness of the bonding adhesive layer based on the light beam reflected by the display screen. The method for processing the surface of the display screen to make the surface of the display screen smooth comprises the following steps: coating a filling layer on the surface of the protective film layer to fill the pits on the surface of the protective film layer; and scraping the filling layer flat by using a scraper to make the surface of the protective film layer smooth, so that the light emitted by the thickness gauge can be reflected as a concentrated light beam which can return to the thickness gauge. The filling layer is liquid or semi-solid optical water glue, and the refractive index of the optical water glue is equal to the refractive index of the light-transmitting panel plated with the protective film layer. The method further comprises the following steps after the step of obtaining the thickness of the bonding adhesive layer based on the light beam reflected by the display screen: erasing the filling layer coated on the surface of the protective film layer. The refractive index of the optical water glue is 1.

51. The method further comprises the following steps in the step of scraping the filling layer flat by using a scraper: scraping back and forth on the surface of the protective film layer. The method further comprises the following steps after the step of emitting light to the surface of the display screen by using a thickness gauge and before the step of receiving the light beam reflected by the display screen: adjusting the distance between the thickness gauge and the surface of the display screen to focus the light emitted by the thickness gauge on a point on the surface of the display screen. The method further comprises the following steps in the step of receiving the light beam reflected by the display screen: identifying different reflection surfaces of the bonding adhesive layer irradiated by the light; and obtaining the return distance values of the light returned to the thickness gauge from the different reflection surfaces. The display screen comprises a first light-transmitting panel and a second light-transmitting panel, the first light-transmitting panel and the second light-transmitting panel are bonded with each other through the bonding adhesive layer, the surface of the second light-transmitting panel away from the bonding adhesive layer is plated with the protective film layer, the different reflection surfaces comprise a first reflection surface and a second reflection surface, the first reflection surface is the contact surface of the bonding adhesive layer and the first light-transmitting panel, and the second reflection surface is the contact surface of the bonding adhesive layer and the second light-transmitting panel.

2. The detection method according to claim 1, characterized in that, The return distance values comprise a first return distance value and a second return distance value, the first return distance value is the distance of the light returned to the thickness gauge from the first reflection surface, and the second return distance value is the distance of the light returned to the thickness gauge from the second reflection surface. In the step of obtaining the thickness of the bonding adhesive layer based on the light beam reflected by the display screen, the thickness of the bonding adhesive layer is calculated according to the formula: (D1-D2) x alpha.

3. The method of claim 1, wherein ​ 4. The method of claim 1, wherein ​ ​ 5. The method of claim 1, wherein ​ ​ 6. The method of claim 1, wherein, ​ ​ ​ 7. The detection method according to claim 6, characterized in that, ​ ​ 8. The detection method according to claim 7, characterized in that, ​ Wherein, D1 is the first return distance value, D2 is the second return distance value, and a is the refractive index coefficient of the adhesive layer.

9. A display screen lamination process characterized by, The method comprises the steps of: coating the adhesive layer on the surface of the first light-transmitting panel; covering the second light-transmitting panel on the adhesive layer so that the first light-transmitting panel and the second light-transmitting panel are adhered to each other; detecting the thickness of the adhesive layer at different positions of the display screen by using the detection method according to any one of claims 1-8.

10. The display screen lamination process of claim 9, wherein, After the step of detecting the thickness of the adhesive layer at different positions of the display screen, the method comprises the steps of: calculating the average value after multiple detections; judging whether the thickness error of the adhesive layer is within the specified range based on the average value obtained after multiple detections, and if the thickness error of the adhesive layer is within the specified range, the display screen is a qualified product.

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