A detection structure and detection method for silicone adhesive effect at step points of display screen

Abstract

The present invention discloses a detection structure and method for the effect of silicone glue on the step of a display screen. The detection structure includes a display screen cover plate and a liquid crystal panel matched with the display screen cover plate. The lower end of the display screen cover plate is provided with a transparent area, and the display screen cover plate is glued and glued with the liquid crystal panel in the transparent area. The detection structure and method for the effect of silicone glue on the step of a display screen of the present invention are provided with a transparent area on the display screen cover plate, and glue is glued in the transparent area to make the display screen cover plate and the liquid crystal panel fit, so that the glued area is in a visible state. Later, the glued area and glued effect of the transparent area are directly detected by an automated image measuring instrument, which greatly improves the accuracy of the detection, avoids the disassembly of normal products, reduces the loss of bad parts caused by detection, and the liquid crystal panel can be replaced by defective products with complete structure, which saves more energy and is worthy of vigorous promotion and use.

Description

Technical Field

[0001] The present invention relates to the technical field of display screen bonding, and in particular to a detection structure and a detection method for silicone adhesive effect at step points of a display screen. Background Art

[0002] Before the display screen leaves the factory, it is usually necessary to conduct a random inspection of the bonding of the display screen, that is, to test the dispensing effect of the silicone glue at the TFT step of the display screen cover and the liquid crystal panel. Figure 1 This is a schematic diagram of a display cover of a normal product, where a is the VA area of ​​the display cover, and b is the ink area of ​​the display cover. Usually, glue is dispensed in the ink area to fit the display cover to the TFT. Figure 2 The figure is a perspective view of the display screen cover plate and the liquid crystal panel of a normal product after being glued together, where c is the glue point formed by glueing between the display screen cover plate and the liquid crystal panel. The traditional methods for detecting glue points are as follows: 1. Checking the effect of the glue points by disassembling the display screen cover plate; 2. Checking the effect of the glue points through the semi-finished glass on the back of the liquid crystal panel. In method 1, the process of disassembling the cover plate is complicated and the workload is large. After disassembling the cover plate, the silicone glue at the TFT step needs to be cut from the middle with a knife, which will destroy the actual glue effect of the silicone glue to a certain extent. The detected silicone glue is not in its state before disassembly and can only be used as a reference. The screen is easily damaged during the disassembly of the cover plate, and the disassembled product can only be discarded, causing losses. Method 2 requires observing the effect of the silicone glue through the back of the semi-finished glass, and the contact area between the silicone glue and the cover plate cannot be measured. In the process of checking the effect of the silicone glue through the semi-finished glass, if there is an ITO circuit on the TFT step, it is easy to block the light and affect the measurement. If the surface of the glass step is affixed with relevant opaque materials, the silicone glue cannot be detected through light. There are also certain requirements for the transparency of silicone glue. If high-transparency silicone glue is used, it will not be easy to see the dispensing position of the silicone glue through the semi-finished glass on the back, and it will be impossible to observe the dispensing bubbles of the silicone glue.

[0003] Based on this, there is an urgent need for a detection structure and a detection method for detecting the effect of silicone glue dots, so as to accurately measure parameters such as the contact area ratio between the silicone glue and the display cover, without causing damage and waste of materials. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a detection structure and method for detecting the effect of silicone glue on step points of a display screen.

[0005] The technical solution of the present invention is as follows: The present invention provides a detection structure and a detection method for the effect of silicone glue on the step points of a display screen. The detection structure includes a display screen cover and a liquid crystal panel that is matched and bonded to the display screen cover. A transparent area is provided at the lower end of the display screen cover, and the display screen cover is glued to the liquid crystal panel in the transparent area.

[0006] Furthermore, the top surface of the liquid crystal panel is a TFT substrate, the transparent area corresponds to a step of the TFT substrate, and the display screen cover plate and the TFT substrate are glued together at the step.

[0007] Furthermore, the entire surface of the display screen cover is a transparent area; or,

[0008] The display screen cover is also provided with a silk-screen ink area, and the transparent area includes a first transparent area and a second transparent area, the first transparent area is a VA display area, the silk-screen ink area is arranged around the periphery of the first transparent area, and the second transparent area is arranged below the silk-screen ink area.

[0009] Furthermore, the upper edge of the second transparent area is 0.3-0.6 mm away from the lower edge of the first transparent area.

[0010] Furthermore, the second transparent area includes: a third transparent area and a fourth transparent area, the third transparent area and the fourth transparent area are respectively arranged on the left and right ends of the bottom of the display screen cover, and the lower part of the silk-screen ink area extends to fill between the third transparent area and the fourth transparent area.

[0011] Furthermore, the liquid crystal panel is a defective product with a complete structure.

[0012] The present invention also provides a method for detecting the effect of silicone adhesive on the step points of a display screen, the method comprising the following steps:

[0013] Providing a display screen cover plate, wherein the end of the display screen cover plate is a transparent area;

[0014] Dispensing glue in the transparent area to bond the display screen cover plate and the liquid crystal panel together;

[0015] Measuring the formed silicone adhesive dots through the transparent area using an automated measuring instrument;

[0016] The area of ​​the silicone adhesive dot and the fitting area between the silicone adhesive dot and the display screen cover are calculated according to the measurement results.

[0017] Furthermore, the above steps also include: calculating the distances between the edge of the silicone glue dot and the edge of the TFT cover plate and the edge of the cable respectively according to the measurement results, and detecting the bubble situation of the silicone glue dot.

[0018] Furthermore, the top surface of the liquid crystal panel is a TFT substrate, the transparent area corresponds to a step of the TFT substrate, and the display screen cover plate and the TFT substrate are glued together at the step;

[0019] The entire surface of the display screen cover is a transparent area; or, the display screen cover is further provided with a silk-screen ink area, the transparent area includes a first transparent area and a second transparent area, the first transparent area is a VA display area, the silk-screen ink area is arranged around the periphery of the first transparent area, and the second transparent area is arranged below the silk-screen ink area;

[0020] The automated measuring instrument is a two-dimensional image measuring instrument, and the liquid crystal panel is a defective product with a complete structure.

[0021] Furthermore, the upper edge of the second transparent area is 0.3-0.6 mm away from the lower edge of the first transparent area;

[0022] The second transparent area includes: a third transparent area and a fourth transparent area, the third transparent area and the fourth transparent area are respectively arranged on the left and right ends of the bottom of the display screen cover, and the lower part of the silk-screen ink area extends to fill between the third transparent area and the fourth transparent area.

[0023] By adopting the above scheme, the present invention provides a detection structure and method for the effect of silicone glue on the step points of a display screen, which provides a transparent area on the display screen cover plate, and performs glue dispensing on the transparent area to fit the display screen cover plate to the liquid crystal panel, and the glue dispensing area is in a visible state. Later, the glue dispensing area and glue dispensing effect of the transparent area are directly detected by an automatic measuring instrument, which greatly improves the accuracy of silicone glue effect detection, avoids disassembly of normal products, and reduces losses caused by silicone glue point detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the display cover of a normal product.

[0025] Figure 2 This is a perspective view of a normal product's display cover and LCD panel after gluing.

[0026] Figure 3 This is a perspective view of the display screen cover and the liquid crystal panel after being glued together in Example 1.

[0027] Figure 4 This is a perspective view of the display screen cover and the liquid crystal panel after being glued together in Example 2.

[0028] Figure 5 This is a perspective view of the display screen cover and the liquid crystal panel after being glued together in Example 3.

[0029] Figure 6 The present invention is a flow chart of a method for detecting the effect of silicone adhesive on step points of a display screen.

[0030] Figure 7It is a partial enlarged view of the glue-bonding area of ​​the display screen cover and the liquid crystal panel in the present invention. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] See also Figure 3 The detection structure of the silicone glue effect of the step point of the display screen of this embodiment includes a display screen cover plate 10 and a liquid crystal panel matched with the display screen cover plate 10, the top surface of the liquid crystal panel is a TFT substrate 30, and the display screen cover plate 10 and the TFT substrate 30 are glued at the step of the TFT substrate 30. The display screen cover plate 10 is a transparent area as a whole, and there is no silk screen ink area, and the display screen cover plate 10 and the liquid crystal panel are glued. This design eliminates the processing link of the silk screen ink of the display screen cover plate 10, saves the process and saves raw materials, and makes the glue point 20 where the display screen cover plate 10 and the TF substrate are bonded clearly visible, and the area size of the silicone glue point 40, the bonding area of ​​the silicone glue point and the display screen cover plate 10, and the bubble situation of the silicone glue point 40 can be detected by a two-dimensional image measuring instrument, with high accuracy, and has a high reference value for the glue point situation of normal products. It also avoids disassembling normal products to detect the effect of silicone adhesive points, saves test costs and improves test efficiency.

[0034] Example 2

[0035] See also Figure 4 The detection structure of the silicone glue effect on the step of the display screen of this embodiment includes a display screen cover plate 11 and a liquid crystal panel matched with the display screen cover plate 11. The display screen cover plate 11 is provided with a silk screen ink area 100 and a transparent area. The transparent area includes a first transparent area 101 and a second transparent area 102. The first transparent area 101 is a VA display area. The silk screen ink area 100 is arranged around the first transparent area 101. The second transparent area 102 is arranged below the silk screen ink area 100. The second transparent area 102 corresponds to the step of the TFT substrate 31. The display screen cover plate 11 is glued to the step of the TFT substrate 31 in the second transparent area 102. Furthermore, the upper edge of the second transparent area 102 is 0.3-0.6mm away from the lower edge of the first transparent area 101, so as to ensure that the VA area boundary is not affected, and the second transparent area 102 after the silicone glue is applied is not blocked to affect the detection glue application effect. That is, a silk screen ink area with a width of 0.3-0.6mm is provided between the two transparent areas. Figure 4As shown, the second transparent area 102 is located below the silk-screen ink area 100, the upper edge of the second transparent area 102 is the lower edge of the silk-screen ink area 100, and the lower edge of the second transparent area 102 is the lower edge of the display screen cover plate 11, which meets the space requirement for glue dispensing. At this point, the display screen cover plate 11 and the TFT substrate 31 are glued in the second transparent area 102, and the glue dots 41 can be observed and detected through the second transparent area 102. Similar to Example 1, the area size of the silicone glue dots 41, the bonding area between the silicone glue dots and the display screen cover plate 11, and the bubble situation of the silicone glue dots 41 can be detected by a two-dimensional image measuring instrument, which has high accuracy and has a high reference value for the glue dot situation of normal products.

[0036] Example 3

[0037] See also Figure 5 The detection structure of the step-point silicone glue effect of the display screen of this embodiment is similar to that of the embodiment 2, except that the second transparent area includes a third transparent area 103 and a fourth transparent area 104 respectively arranged on the left and right ends of the bottom of the display screen cover plate 11', and the lower part of the screen printing ink area 100' extends to fill the display screen cover plate 11' between the third transparent area 103 and the fourth transparent area 104. The widths of the third transparent area 103 and the fourth transparent area 104 are set corresponding to the glue dispensing area, such as Figure 5 As shown, the right side boundary of the third transparent area 103 is aligned with the left edge of the cable 20, the left side boundary of the fourth transparent area 104 is aligned with the right edge of the cable 20, and the middle of the third transparent area 103 and the fourth transparent area 104 is a silk-screen ink area extending downward. When dispensing, the glue point 41' is controlled to be on the third transparent area 103 and the fourth transparent area 104, and the area size of the glue point 41', the fitting area of ​​the display screen cover 11' and the TFT substrate 31', and the bubble situation of the glue point 41' are directly detected through the two transparent areas, with high accuracy. As with the previous two embodiments, it has a high reference value for the silicone glue point situation of normal products. The third transparent area 103 and the fourth transparent area 104 are separated by the silk-screen ink area extending downward, which can play a role in limiting the dispensing area, and the dispensing accuracy is improved.

[0038] It is worth mentioning that in the process of manufacturing the detection structure of the step point silicone adhesive effect of the display screen of the present invention, the liquid crystal panel can be replaced with a defective product with a complete structure, saving costs. The detection structure of the present invention avoids the previous silicone adhesive point inspection, which requires the normal product to be disassembled and damaged, thereby causing waste of resources, and greatly reduces the waste of production raw materials.

[0039] A method for detecting the effect of silicone adhesive on step points of a display screen of the present invention is as follows:

[0040] Step 1, provide a display screen cover, the end of the display screen cover is a transparent area, such as the display screen cover in the above embodiments 1-3, and the liquid crystal panel is glued in its transparent area, and the glue dispensing method is the same as the glue dispensing method of normal products. Specifically, the top surface of the liquid crystal panel is a TFT substrate, the transparent area corresponds to the step of the TFT substrate, and the display screen cover and the TFT substrate are glued at the step; the entire surface of the display screen cover is a transparent area; or, the display screen cover is also provided with a silk screen ink area, the transparent area includes a first transparent area and a second transparent area, the first transparent area is a VA display area, the silk screen ink area is arranged around the periphery of the first transparent area, and the second transparent area is arranged below the silk screen ink area. The upper edge of the second transparent area is 0.3-0.6mm away from the lower edge of the first transparent area. In other embodiments, the second transparent area includes: a third transparent area and a fourth transparent area, the third transparent area and the fourth transparent area are respectively arranged on the left and right ends of the bottom of the display screen cover, and the lower part of the silk screen ink area extends to fill between the third transparent area and the fourth transparent area. The liquid crystal panel uses defective products with complete structures, saving detection costs.

[0041] Step 2: After the glue is applied, the glued inspection structure is placed on an automated measuring instrument, and the transparent area is photographed using its CCD, and measurement and calculation are performed. The automated measuring instrument is a two-dimensional image measuring instrument, which is based on CCD digital images and relies on computer screen measurement technology and powerful software capabilities for spatial geometric operations. It is a common image measuring instrument in the prior art and has the advantages of high measurement accuracy and easy operation.

[0042] Step three, according to the measurement results, calculate the area of ​​the silicone glue dot, the bonding area between the silicone glue dot and the display cover, the distance between the edge of the silicone glue dot and the edge of the TFT substrate and the edge of the cable, and include detecting and analyzing the bubble situation of the glue dot based on the image collected by the CCD.

[0043] Step 4: Determine whether the silicone adhesive point is qualified according to the test results of the automatic measuring instrument, as shown in the attached Figure 7 As shown, specifically:

[0044] Area A is the contact area between the TFT substrate and the silicone adhesive, and area B is the contact area between the display cover and the silicone adhesive. When performing glue point detection, the area of ​​B / area of ​​A ≧80%, which means the detection is qualified. In addition, the detection standards for other parameters are as follows: the distance from the silicone adhesive in contact with the TFT substrate to the side of the TFT substrate X1 ≦ 0.6mm; the distance from the silicone adhesive in contact with the TFT substrate to the edge of the FPC in the binding area X2 ≦ 1mm; the distance from the silicone adhesive in contact with the TFT substrate to the bottom of the TFT substrate Y1 ≦ 0.6mm; the distance from the silicone adhesive in contact with the TFT substrate to the bottom of the CF glass Y2 ≦ 0.6mm.

[0045] In summary, the detection structure and method of the silicone glue effect on the step of a display screen of the present invention, by setting a transparent area on the display screen cover plate, and applying glue in the transparent area to fit the display screen cover plate to the liquid crystal panel, so that the glue-applied area is in a visible state, and later the glue-applied area and the glue-applied effect of the transparent area are directly detected by an automatic image measuring instrument, which greatly improves the accuracy of the detection, avoids the disassembly of normal products, reduces the loss of bad parts caused by detection, and the liquid crystal panel can be replaced by defective products with complete structure, which saves more energy and is worthy of vigorous promotion and use.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A detection structure for the effect of silicone glue on the step point of a display screen, characterized in that: It comprises a display screen cover plate and a liquid crystal panel matched with the display screen cover plate, wherein a transparent area is provided at the lower end of the display screen cover plate, and the display screen cover plate is bonded with the liquid crystal panel in the transparent area with silicone adhesive; The top surface of the liquid crystal panel is a TFT substrate, the transparent area corresponds to the step of the TFT substrate, and the display screen cover plate and the TFT substrate are bonded with silicone glue at the step; the display screen cover plate is also provided with a silk-screen ink area, the transparent area includes a first transparent area and a second transparent area, the first transparent area is a VA display area, the silk-screen ink area is arranged around the periphery of the first transparent area, and the second transparent area is arranged below the silk-screen ink area; The second transparent area includes: a third transparent area and a fourth transparent area, the third transparent area and the fourth transparent area are respectively arranged on the left and right ends of the bottom of the display screen cover, and the lower part of the silk-screen ink area extends to fill between the third transparent area and the fourth transparent area.

2. The detection structure of the silicone adhesive effect at the step point of the display screen according to claim 1 is characterized in that: The upper edge of the second transparent area is 0.3-0.6 mm away from the lower edge of the first transparent area.

3. The detection structure of the silicone adhesive effect at the step point of the display screen according to claim 1 is characterized in that: The liquid crystal panel is a defective product with a complete structure.

4. A method for detecting the effect of silicone glue on step points of a display screen, characterized in that: The following steps are involved: Providing a display screen cover plate, wherein the end of the display screen cover plate is a transparent area; applying silicone glue in the transparent area to adhere the display screen cover plate to the liquid crystal panel; Measuring the formed silicone adhesive dots through the transparent area using an automated measuring instrument; Calculating the area of ​​the silicone glue dots and the bonding area between the silicone glue dots and the display screen cover plate according to the measurement results; The top surface of the liquid crystal panel is a TFT substrate, the transparent area corresponds to the step of the TFT substrate, and the display screen cover plate and the TFT substrate are bonded with silicone glue at the step; The display screen cover is also provided with a silk-screen ink area, the transparent area includes a first transparent area and a second transparent area, the first transparent area is a VA display area, the silk-screen ink area is arranged around the periphery of the first transparent area, and the second transparent area is arranged below the silk-screen ink area; The automated measuring instrument is a two-dimensional image measuring instrument, and the liquid crystal panel is a defective product with a complete structure; The second transparent area includes: a third transparent area and a fourth transparent area, the third transparent area and the fourth transparent area are respectively arranged on the left and right ends of the bottom of the display screen cover, and the lower part of the silk-screen ink area extends to fill between the third transparent area and the fourth transparent area.

5. The detection method according to claim 4, characterized in that: Also includes: The distances between the edge of the silicone adhesive dot and the edge of the TFT substrate and the edge of the wiring are calculated according to the measurement results, and the bubble situation of the silicone adhesive dot is detected.

6. The detection method according to claim 4, characterized in that: The upper edge of the second transparent area is 0.3-0.6 mm away from the lower edge of the first transparent area.

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