Cover bonding structure for vehicle display screen

Abstract

The present invention relates to a cover plate bonding structure for a vehicle-mounted display screen, including a cover plate, a TFT module, a first two-component silicone adhesive layer, a second two-component silicone adhesive layer and a mounting frame. The cover plate is fixed by the two-component silicone adhesive, and the temperature shock and mechanical vibration resistance between the cover plate and the mounting frame are increased, so that the reliability of mechanical shock is high. The second two-component silicone adhesive layer fixes the TFT module on the mounting frame. The two-component silicone soft adhesive can achieve reliable bonding at room temperature and within a reasonable process time, and the two-component silicone adhesive has good weather resistance to ensure that the vehicle-mounted product is reliably fixed at ‑40℃~+95℃. The two-component silicone soft adhesive has good flexibility, which can effectively eliminate the assembly error caused by the cumulative size error of each part, as well as the internal stress introduced by the torque difference and deformation when screwing, so as to avoid the deterioration of low light leakage. It takes into account the requirements of narrow black frame of the display screen, the requirements of fixed reliability, the requirements of low light leakage prevention, the requirements of low cost, the requirements of flexible design and the requirements of manufacturing automation.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle-mounted display screens, and in particular to a cover plate bonding structure for a vehicle-mounted display screen. Background Art

[0002] As we all know, with the development of intelligent technology, smart cockpits are becoming more and more popular among automotive OEMs and users. Users are increasingly looking for narrow-framed, all-in-one black effects for the cover (CoverLens) of car instruments, navigation displays, and air-conditioning touch / display screens when the screen is off; low light leakage (Mura) of the display screen; and high reliability and high weather resistance of the cover.

[0003] However, the prior art still has the following problems:

[0004] First of all, to achieve the narrow frame and integrated black effect, the surrounding space will be too narrow, the pasting area of ​​​​the traditional double-sided tape will be too small, and the fixing strength of the cover will be insufficient.

[0005] Secondly, the traditional fixing method is to fix the display module to the plastic front frame or sheet metal bracket by screwing, which will introduce mechanical internal stress, aggravate the light leakage of the display, and fail to meet the low light leakage requirements.

[0006] Furthermore, the vehicle-mounted instruments and navigation display screens now need to achieve high reliability and high weather resistance in the fixation of the cover. Another traditional fixing method is double-sided tape. However, it is also difficult to overcome the problems of local cracking and warping of the cover caused by temperature shock and mechanical shock, and the reliability of the product cannot be guaranteed.

[0007] Finally, the size of display screens is getting bigger and bigger, and the cost of traditional double-sided tape is high. The labor cost of traditional double-sided tape pasting is also high. Traditional double-sided tape pasting is increasingly unsuitable for automation needs. Summary of the invention

[0008] Based on this, in order to overcome the deficiencies of the prior art described above, a cover plate bonding structure for a vehicle-mounted display screen is provided.

[0009] A cover plate bonding structure for a vehicle-mounted display screen comprises a cover plate, a TFT module, a first two-component silicone adhesive layer, a second two-component silicone adhesive layer and a mounting frame, wherein the TFT module is arranged on the cover plate, and a first bonding area and a second bonding area are arranged on the mounting frame, the first two-component silicone adhesive layer is bonded to the first bonding area, and the second two-component silicone adhesive layer is bonded to the second bonding area, the first two-component silicone adhesive layer is bonded to the cover plate, and the second two-component silicone adhesive layer is bonded to a side of the TFT module away from the cover plate.

[0010] In one embodiment, the first bonding area is arranged around the second bonding area.

[0011] In one embodiment, the installation frame is provided with a first bonding surface on the first bonding area, the first bonding surface is provided with diamond patterns, and the first two-component silicone adhesive layer is bonded to the diamond patterns;

[0012] The installation frame is provided with a second bonding surface on the second bonding area, the second bonding surface is provided with a honeycomb pattern, and the second two-component silicone adhesive layer is bonded to the honeycomb pattern.

[0013] In one embodiment, the cover plate is a tempered glass cover plate or a composite plate cover plate.

[0014] In one embodiment, the thickness of the first two-component silicone adhesive layer is in the range of 0.3 mm to 0.7 mm;

[0015] The thickness of the second two-component silicone adhesive layer is in the range of 0.5 mm to 1.0 mm.

[0016] In one of the embodiments, the TFT module includes a display screen and a backlight panel, the display screen is disposed on the backlight panel, and the display screen and the backlight panel are respectively bonded to the cover panel.

[0017] In one embodiment, the TFT module further includes a first adhesive layer and a second adhesive layer, the display screen is bonded to the cover plate via the first adhesive layer, and the backlight plate is bonded to the cover plate via the second adhesive layer.

[0018] In one embodiment, the first adhesive layer is an OCA optical adhesive layer, and the second adhesive layer is an OCA optical adhesive layer or a double-sided adhesive layer.

[0019] In one embodiment, the cover plate includes a frame panel and a visible panel, the visible panel is inserted into the edge panel, and the visible panel is aligned with the display screen.

[0020] In one embodiment, the width of the border panel is in the range of 2 mm to 5 mm.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] Firstly, the present invention fixes the cover plate by two-component silicone adhesive to increase the resistance to temperature shock and mechanical vibration between the cover plate and the mounting frame, so that the reliability of mechanical shock is high and quality problems such as local cracking and warping of the cover plate will not occur.

[0023] Secondly, the present invention uses the second two-component silicone adhesive layer to fix the TFT module on the mounting frame. The two-component silicone soft adhesive can achieve reliable bonding at room temperature and within a reasonable process time, and the two-component silicone adhesive has good weather resistance, which can ensure reliable fixation of vehicle-mounted products at -40℃~+95℃. The two-component silicone soft adhesive has good flexibility, which can effectively eliminate the assembly error caused by the cumulative size error of each part, as well as the internal stress introduced by torque difference and deformation during screw fixing, and avoid the problem of low light leakage deterioration. It takes into account the requirements of narrow black border of the display screen, the requirements of fixing reliability, the requirements of preventing low light leakage, the requirements of low cost, the requirements of flexible design and the requirements of manufacturing automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic structural diagram of a cover plate bonding structure for a vehicle-mounted display screen according to one embodiment of the present invention.

[0025] Figure 2 This is a schematic structural diagram of a cover plate bonding structure for a vehicle-mounted display screen according to another embodiment of the present invention.

[0026] Figure 3 FIG. 4 is a schematic structural diagram of a cover plate and a TFT module according to an embodiment of the present invention.

[0027] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The same or similar numbers correspond to the same or similar parts. The terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations on this patent. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby more clearly defining the protection scope of the present invention.

[0029] See also Figure 1 , which is a structural schematic diagram of a cover plate 100 assembly structure 10 of a vehicle-mounted display screen according to an embodiment of the present invention. Figure 2A cover plate 100 assembly structure 10 of a vehicle-mounted display screen includes a cover plate 100, a TFT module 200, a first two-component silicone adhesive layer 300, a second two-component silicone adhesive layer 400 and a mounting frame 500, wherein the TFT module 200 is disposed on the cover plate 100, and the mounting frame 500 is provided with a first bonding area 510 and a second bonding area 520, wherein the first two-component silicone adhesive layer 300 is bonded to the first bonding area 510, and the second two-component silicone adhesive layer 400 is bonded to the first bonding area 520. The adhesive layer 400 is bonded to the second bonding area 520, the first two-component silicone adhesive layer 300 is bonded to the cover plate 100, and the second two-component silicone adhesive layer 400 is bonded to a side of the TFT module 200 away from the cover plate 100. It should be noted that the adhesive material of the first two-component silicone adhesive layer 300 and the second two-component silicone adhesive layer 400 is a two-component silicone adhesive, which is a two-component silicone adhesive in the prior art. Two-component silicone adhesive has good bonding properties to materials such as glass and aluminum alloys. It is suitable for automatic and manual production lines for insulating glass and has the following characteristics: 1. Two-component, neutral room temperature curing; 2. Non-corrosive to building materials such as metals and coated glass, and has excellent bonding and sealing properties with most building materials, and has good elongation, watertightness and other functions; 3. The curing speed is adjustable, and the product forms a high-modulus elastomer that is cold-resistant and heat-resistant after curing, and has excellent weather resistance and anti-aging properties; 4. It does not contain solvents and does not pollute the environment. For example, the two-component silicone adhesive is German Wacker RT776 or CN+Catalyst T75. Of course, it can also be a two-component adhesive of other systems, as long as it can achieve the function of flexible adhesion.

[0030] In one embodiment, the first bonding area is arranged around the second bonding area. For another example, the installation frame is provided with a first adhesive surface on the first adhesive area, and the first adhesive surface is provided with diamond patterns, and the first two-component silicone adhesive layer is bonded to the diamond patterns. The diamond patterns are provided on the first adhesive surface of the first adhesive area to increase the roughness of the surface of the first adhesive surface, so that the first two-component silicone adhesive layer can be bonded more firmly, and a first rough surface is provided on the cover plate at a relative position to increase the bonding force between the first two-component silicone adhesive layer and the cover plate; the installation frame is provided with a second adhesive surface on the second adhesive area, and the second adhesive surface is provided with honeycomb patterns, and the second two-component silicone adhesive layer is bonded to the honeycomb patterns. The honeycomb patterns are provided on the second adhesive surface of the second adhesive area to increase the roughness of the surface of the second adhesive surface, so that the second two-component silicone adhesive layer can be bonded more firmly, and a second rough surface is provided on the TFT module at a relative position to increase the bonding force between the second two-component silicone adhesive layer and the TFT module. It should be noted that both the first rough surface and the second rough surface are provided with mesh patterns.

[0031] In order to ensure the fixing strength and the corresponding mechanical impact resistance, the thickness range of the first two-component silicone adhesive layer is 0.3mm-0.7mm; the thickness range of the second two-component silicone adhesive layer is 0.5mm-1.0mm; for example, the thickness of the first two-component silicone adhesive layer is 0.4, and the thickness of the second two-component silicone adhesive layer is 0.5mm.

[0032] In order to solve the problem that the narrow frame of the cover plate causes the surrounding space to be too narrow, if the double-sided tape in the prior art is used to stick the cover plate, it is easy to cause the bonding area to be too small, the fixing strength of the cover plate to be insufficient, and the reliability to be insufficient. Therefore, in the display screen product of the present invention, the cover plate is pasted by a soft glue process to replace the traditional double-sided tape pasting method, which effectively ensures the fixing strength of the cover plate in the narrow frame design. That is, by setting the first bonding area on the mounting frame, the cover plate is adhered to the mounting frame by the first two-component silicone adhesive layer, that is, the cover plate is fixed by the two-component silicone adhesive to increase the resistance to temperature shock and mechanical vibration between the cover plate and the mounting frame, so that the reliability of mechanical shock is high, and there will be no quality problems such as local cracking and warping of the cover plate.

[0033] In one embodiment, please refer to Figure 3 , the cover plate is a tempered glass cover plate or a composite plate cover plate. For another example, the cover plate 100 includes a frame panel 110 and a visible panel 120, the visible panel is inserted into the edge panel, that is, the visible panel is injection-molded and embedded into the frame panel, and the visible panel is aligned with the display screen. For another example, the width of the frame panel ranges from 2mm to 5mm. Preferably, the width of the frame panel is 2mm, which can effectively achieve a narrow frame on the appearance of the cover plate. It should be noted that the frame panel is a black frame.

[0034] In addition, in order to solve the problem that the traditional fixing method of screwing generates internal stress that is difficult to eliminate, serious light leakage occurs, and the low light leakage requirements of customers cannot be met, the present invention adopts a two-component silicone adhesive, that is, the second two-component silicone adhesive layer, on the back of the TFT module corresponding to the mounting frame, that is, on the second bonding area, and the TFT module is fixed to the mounting frame with glue, replacing the traditional double-sided tape and screwing fixing method. The two-component silicone soft adhesive can achieve reliable bonding at room temperature and within a reasonable process time, and the two-component silicone adhesive has good weather resistance, which can ensure reliable fixation of vehicle-mounted products at -40℃~+95℃. The two-component silicone soft adhesive has good flexibility, which can effectively eliminate the assembly error caused by the cumulative size errors of various parts, as well as the internal stress introduced by the torque difference and deformation of the screw fixing, and avoid the problem of deterioration of low light leakage. In the prior art, there is a method of fixing the TFT module on the mounting frame by using hot melt adhesive, but hot melt adhesive is a hard adhesive with high hardness after curing and even higher hardness at low temperature. It basically cannot eliminate the negative impact of the flatness error of the glass cover plate and the plastic front frame of the display assembly, and cannot absorb the internal stress introduced by screwing. The present invention creatively uses a two-component silicone adhesive, which well takes into account the requirements of narrow black borders of the display, the requirements of fixing reliability, the requirements of preventing low light leakage, the requirements of low cost, the requirements of flexible design and the requirements of manufacturing automation, and solves the limitations and contradictions of the previous traditional fixing scheme, with significant innovation and industry value.

[0035] In one embodiment, please refer to Figure 3 , the TFT module 200 includes a display screen 210 and a backlight panel 220, the display screen 210 is disposed on the backlight panel 220, and the display screen 210 and the backlight panel 220 are respectively bonded to the cover panel 100. For another example, the TFT module further includes a first adhesive layer and a second adhesive layer, the display screen is bonded to the cover panel via the first adhesive layer, and the backlight panel is bonded to the cover panel via the second adhesive layer. For another example, the first adhesive layer is an OCA optical adhesive layer, and the second adhesive layer is an OCA optical adhesive layer or a double-sided adhesive layer.

[0036] The existing display screen size is getting bigger and bigger. The traditional double-sided tape material itself is expensive, and the labor cost of traditional double-sided tape pasting is also high. In addition, traditional double-sided tape pasting is increasingly unsuitable for automation needs. The two-component silicone adhesive in this design can reach the curing bonding strength after 15 to 30 minutes of placement. It is easy to construct and can effectively reduce the material cost by more than 50%, the manufacturing cost, and can be easily automated with stable and reliable quality.

[0037] Compared with the prior art, the present invention has the following beneficial technical effects:

[0038] Firstly, the present invention fixes the cover plate by two-component silicone adhesive to increase the resistance to temperature shock and mechanical vibration between the cover plate and the mounting frame, so that the reliability of mechanical shock is high and quality problems such as local cracking and warping of the cover plate will not occur.

[0039] Secondly, the present invention uses the second two-component silicone adhesive layer to fix the TFT module on the mounting frame. The two-component silicone soft adhesive can achieve reliable bonding at room temperature and within a reasonable process time, and the two-component silicone adhesive has good weather resistance, which can ensure reliable fixation of vehicle-mounted products at -40℃~+95℃. The two-component silicone soft adhesive has good flexibility, which can effectively eliminate the assembly error caused by the cumulative size error of each part, as well as the internal stress introduced by torque difference and deformation during screw fixing, and avoid the problem of low light leakage deterioration. It takes into account the requirements of narrow black border of the display screen, the requirements of fixing reliability, the requirements of preventing low light leakage, the requirements of low cost, the requirements of flexible design and the requirements of manufacturing automation.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. 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 claims of the present invention.

Claims

1. A cover plate bonding structure for a vehicle-mounted display screen, characterized in that: The invention comprises a cover plate, a TFT module, a first two-component silicone adhesive layer, a second two-component silicone adhesive layer and a mounting frame, wherein the TFT module is arranged on the cover plate, and a first bonding area and a second bonding area are arranged on the mounting frame, the first two-component silicone adhesive layer is bonded to the first bonding area, and the second two-component silicone adhesive layer is bonded to the second bonding area, the first two-component silicone adhesive layer is bonded to the cover plate, and the second two-component silicone adhesive layer is bonded to a side of the TFT module away from the cover plate; The first bonding area is arranged around the second bonding area; the cover plate includes a frame panel and a visible panel, the visible panel is inserted into the frame panel, and the first two-component silicone adhesive layer is bonded to the frame panel.

2. The cover plate bonding structure for a vehicle-mounted display screen according to claim 1, characterized in that: The installation frame is provided with a first bonding surface on the first bonding area, the first bonding surface is provided with diamond patterns, and the first two-component silicone adhesive layer is bonded to the diamond patterns; The installation frame is provided with a second bonding surface on the second bonding area, the second bonding surface is provided with a honeycomb pattern, and the second two-component silicone adhesive layer is bonded to the honeycomb pattern.

3. The cover plate bonding structure for a vehicle-mounted display screen according to claim 1, characterized in that: The cover plate is a tempered glass cover plate or a composite plate cover plate.

4. The cover plate bonding structure for a vehicle-mounted display screen according to claim 1, characterized in that: The thickness of the first two-component silicone adhesive layer is in the range of 0.3 mm to 0.7 mm; The thickness of the second two-component silicone adhesive layer is in the range of 0.5 mm to 1.0 mm.

5. The cover plate bonding structure for a vehicle-mounted display screen according to claim 1, characterized in that: The TFT module comprises a display screen and a backlight plate, wherein the display screen is arranged on the backlight plate, and the display screen and the backlight plate are respectively bonded to the cover plate.

6. The cover bonding structure for a vehicle-mounted display screen according to claim 5, characterized in that: The TFT module further includes a first adhesive layer and a second adhesive layer. The display screen is bonded to the cover plate via the first adhesive layer, and the backlight plate is bonded to the cover plate via the second adhesive layer.

7. The cover bonding structure for a vehicle-mounted display screen according to claim 6, wherein: The first adhesive layer is an OCA optical adhesive layer, and the second adhesive layer is an OCA optical adhesive layer or a double-sided adhesive layer.

8. The cover bonding structure for a vehicle-mounted display screen according to claim 5, characterized in that: The visual panel is aligned with the display screen.

9. The cover bonding structure for a vehicle-mounted display screen according to claim 8, characterized in that: The width of the frame panel ranges from 2 mm to 5 mm.

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