Liquid crystal display screen with visible area of cover plate smaller than visible area of TFT (Thin Film Transistor) module
By pasting PET film on the lower surface of the cover plate of the liquid crystal display screen, the uneven curing and high-temperature macular problems caused by water glue overflow are solved, and a more uniform water glue curing and stress reduction effect is achieved.
Patent Information
- Application Number
- CN202420593185.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-03-25
AI Technical Summary
In the LCD screen, since the cover viewing area is smaller than the TFT module viewing area, part of the area of the shading ink layer is blocked by water glue, resulting in uneven curing of the water glue, which is prone to glue overflow and high-temperature macula.
PET film is pasted on the visual area of the TFT module and located at the lower surface of the cover plate at the shading ink layer. When the water glue overflows, it can only flow to both sides of the PET film. After pre-curing, the PET film is extracted to avoid excessive water glue residue.
It effectively avoids uneven curing of water glue and glue overflow problems, reduces stress, and improves the appearance of high-temperature macula.
Smart Images
Figure CN222784657U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid crystal display, and more specifically to a liquid crystal display screen whose cover plate visible area is smaller than that of a TFT module. Background Art
[0002] Since the mold opening fee of TFT module is very expensive, some small batch products will directly use the TFT module that has been molded to save costs. This results in that the cover plate and the TFT module are not very compatible and there are certain differences. Due to the appearance of the product, sometimes the visible area of the cover plate is small, while the visible area of the TFT module is large. The non-visible area of the cover plate is generally provided with a light-shielding ink layer. In this case, the light-shielding ink layer will cover part of the visible area of the TFT module, that is, the light-shielding ink layer in some areas of the cover plate is wider. At this time, if water glue is bonded, since the water glue is blocked by the light-shielding ink layer, it cannot be cured by light from the top, but can only be cured by light from the side. The width of this part of the water glue is also wider, so it takes a very long time to cure, and uneven curing is prone to occur. Since the amount of water glue is difficult to control very accurately, even if frame glue is added, the glue is easy to overflow the frame glue and run under the light-shielding ink layer, resulting in yellow spots on the product at high temperatures. Utility Model Content
[0003] The technical problem to be solved by the utility model is how to avoid the problem of uneven curing caused by a wide width of the water glue.
[0004] The technical problem to be solved by the utility model is achieved through the following technical solutions:
[0005] In order to solve the above technical problems, the utility model provides a liquid crystal display screen whose cover plate visible area is smaller than the TFT module visible area, comprising a TFT module and a cover plate arranged above the TFT module, the lower surface of the cover plate is provided with a light-shielding ink layer, the light-shielding ink layer has a U-shaped opening, the U-shaped opening forms the cover plate visible area, the TFT visible area of the TFT module is larger than the area of the cover plate visible area, a PET film is adhered to the lower surface of the cover plate located in the TFT visible area and at the light-shielding ink layer, a water glue is arranged between the cover plate and the TFT module, the water glue covers the light-shielding ink layer, the PET film and the lower surface of the cover plate located in the cover plate visible area.
[0006] As a preferred embodiment of the liquid crystal display screen provided by the utility model, in which the visible area of the cover plate is smaller than the visible area of the TFT module, the light-shielding ink layer is frame-shaped, the width of the light-shielding ink layer at the bottom of the lower surface of the cover plate is greater than the width of the light-shielding ink layer located on the left, right and top of the lower surface of the cover plate, the TFT module portion below the light-shielding ink layer at the bottom is the visible area, and the PET film is arranged on the light-shielding ink layer at the bottom of the lower surface of the cover plate.
[0007] As a preferred embodiment of the liquid crystal display screen provided by the utility model, the visible area of the cover plate is smaller than the visible area of the TFT module, and a plurality of grooves are formed on the upper surface of the cover plate by etching, and the upper part of the cover plate is covered with a plastic layer, and the plastic layer is embedded in the plurality of the grooves.
[0008] As a preferred implementation of the liquid crystal display screen provided by the utility model in which the visible area of the cover plate is smaller than the visible area of the TFT module, the shape of the groove is square or circular.
[0009] As a preferred implementation of the liquid crystal display screen provided by the utility model in which the visible area of the cover plate is smaller than the visible area of the TFT module, the groove is a closing groove which is narrow outside and wide inside.
[0010] As a preferred implementation of the liquid crystal display screen provided by the utility model in which the visible area of the cover plate is smaller than the visible area of the TFT module, the cross-sectional shape of the groove is an isosceles trapezoid.
[0011] As a preferred embodiment of the liquid crystal display screen provided by the utility model, in which the visible area of the cover plate is smaller than the visible area of the TFT module, the TFT module includes a lower polarizer, a lower substrate, an upper substrate and an upper polarizer stacked in sequence from bottom to top, the lower substrate is longer than the upper substrate and extends outward to form a step, and the upper surface of the lower substrate located at the step is bound to a driver IC and an FPC.
[0012] As a preferred implementation of the liquid crystal display screen provided by the utility model in which the visible area of the cover plate is smaller than the visible area of the TFT module, two reinforcing plates staggered from each other are provided on both sides of the FPC.
[0013] As a preferred implementation of the liquid crystal display screen provided by the utility model in which the visible area of the cover plate is smaller than the visible area of the TFT module, the widths of the two reinforcing plates are different.
[0014] As a preferred implementation of the liquid crystal display screen provided by the utility model in which the visible area of the cover plate is smaller than the visible area of the TFT module, the outer surfaces of the two reinforcing plates are both provided with a surface treatment layer for improving the surface roughness.
[0015] The utility model has the following beneficial effects:
[0016] Since the lower surface of the cover plate located in the TFT visible area and at the light-shielding ink layer is adhered with a PET film, when the water glue overflows under the light-shielding ink layer, the PET film occupies the position, so the water glue can only flow to the two sides of the PET film, and then the PET film is removed after the surface glue is pre-cured. In this way, even if there is water glue in this place, most of the water glue will be removed by the PET film, thereby avoiding excessive water glue remaining in this place, avoiding excessive water glue under the light-shielding ink layer to bond the cover plate TFT module together and form stress, and also avoiding the problem of uneven curing caused by excessive glue, thereby improving high-temperature yellow spots. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 The utility model provides a structural schematic diagram of a liquid crystal display screen in which the visible area of a cover plate is smaller than the visible area of a TFT module.
[0019] Figure 2 for Figure 1 Bottom view of the middle cover.
[0020] Figure 3 This is a schematic diagram of the structure of Example 2.
[0021] Figure 4 for Figure 3 Schematic diagram of the decomposition structure.
[0022] Figure 5 for Figure 3 Schematic diagram of the improved structure.
[0023] Figure 6 This is a schematic diagram of the structure of Example 4.
[0024] Description of Figure Numbers:
[0025] TFT module 100; cover plate 1; light shielding ink layer 11; square-shaped opening 12; PET film 13; water glue 2;
[0026] Plastic layer 3; groove 14;
[0027] Lower polarizer 4; lower substrate 5; upper substrate 6; upper polarizer 7; FPC 8; reinforcing plate 9. DETAILED DESCRIPTION
[0028] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0030] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0031] The utility model provides a liquid crystal display screen whose cover plate visible area is smaller than the TFT module visible area, comprising a TFT module and a cover plate arranged above the TFT module, wherein a light-shielding ink layer is arranged on the lower surface of the cover plate, the light-shielding ink layer has a U-shaped opening, the U-shaped opening forms the cover plate visible area, the TFT visible area of the TFT module is larger than the area of the cover plate visible area, a PET film is pasted on the lower surface of the cover plate located in the TFT visible area and at the light-shielding ink layer, a water glue is arranged between the cover plate and the TFT module, and the water glue covers the light-shielding ink layer, the PET film and the lower surface of the cover plate located in the cover plate visible area.
[0032] Since the lower surface of the cover plate located in the TFT visible area and at the light-shielding ink layer is adhered with a PET film, when the water glue overflows under the light-shielding ink layer, the PET film occupies the position, so the water glue can only flow to the two sides of the PET film, and then the PET film is removed after the surface glue is pre-cured. In this way, even if there is water glue in this place, most of the water glue will be removed by the PET film, thereby avoiding excessive water glue remaining in this place, avoiding excessive water glue under the light-shielding ink layer to bond the cover plate TFT module together and form stress, and also avoiding the problem of uneven curing caused by excessive glue, thereby improving high-temperature yellow spots.
[0033] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention.
[0034] Example 1
[0035] See also Figure 1 and Figure 2 , a liquid crystal display screen with a cover plate visible area smaller than a TFT module visible area provided by the utility model, comprising a TFT module 100 and a cover plate 1 arranged above the TFT module 100, a light-shielding ink layer 11 is arranged on the lower surface of the cover plate 1, the light-shielding ink layer 11 has a square-shaped opening 12, the square-shaped opening 12 forms a visible area of the cover plate 1, the TFT visible area of the TFT module 100 is larger than the area of the visible area of the cover plate 1, a PET film 13 is pasted on the lower surface of the cover plate 1 located in the TFT visible area and at the light-shielding ink layer 11, a water glue 2 is arranged between the cover plate 1 and the TFT module 100, the water glue 2 covers the light-shielding ink layer 11, the PET film 13 and the lower surface of the cover plate 1 located in the visible area of the cover plate 1. Since the lower surface of the cover plate 1 located in the TFT visible area and at the light-shielding ink layer 11 is adhered with the PET film 13, when the water glue 2 overflows under the light-shielding ink layer 11, the PET film 13 occupies the position, so the water glue 2 can only flow to the two sides of the PET film 13, and then the PET film 13 is removed after the surface glue is pre-cured. In this way, even if there is water glue 2 in this place, most of the water glue 2 will be removed by the PET film 13, thereby avoiding excessive water glue 2 remaining in this place, avoiding excessive water glue 2 under the light-shielding ink layer 11 to bond the cover plate 1 TFT module 100 together to form stress, and also avoiding the problem of uneven curing caused by excessive glue, thereby improving high-temperature yellow spots.
[0036] Furthermore, the light-shielding ink layer 11 is frame-shaped, and the width of the light-shielding ink layer 11 at the bottom of the lower surface of the cover plate 1 is greater than the width of the light-shielding ink layer 11 at the left, right and top of the lower surface of the cover plate 1. The portion of the TFT module 100 below the light-shielding ink layer 11 at the bottom is a visible area, and the PET film 13 is arranged on the light-shielding ink layer 11 at the bottom of the lower surface of the cover plate 1.
[0037] Example 2
[0038] See also Figures 3 to 5 As a further optimization scheme of Example 1, in this embodiment, the upper surface of the cover plate 1 is covered with a plastic layer 3, and a plurality of grooves 14 are formed downward on the upper surface of the cover plate 1 by etching, and a portion of the lower surface of the plastic layer 3 is embedded in each groove 14. Since the surface of the groove 14 formed by etching has a certain degree of roughness, the plastic layer 3 can be tightly bonded to the groove 14 to prevent the cover plate 1 and the plastic layer 3 from falling off. Since the upper part of the cover plate 1 is covered with a plastic layer 3, and a plurality of grooves 14 are formed on the upper surface of the cover plate 1 by etching, and the plastic layer 3 can be embedded in the interior of the plurality of grooves 14, the grooves 14 formed by etching make the inner surface of the grooves 14 have a certain degree of roughness, and the surface of the grooves 14 with a certain degree of roughness can improve the bonding force between the grooves 14 and the plastic layer 3, thereby reducing the possibility of separation of the grooves 14 and the plastic layer 3. When the LCD screen is hit or falls, the plastic layer 3 on the upper surface of the cover plate 1 can directly withstand the external force, thereby preventing the external force from directly acting on the cover plate 1. Since the plastic layer 3 can absorb most of the energy, the remaining external force is very weak when it acts on the cover plate 1, thereby effectively reducing the risk of the cover plate 1 being broken or damaged; and when the LCD screen is subjected to external force, even if the external force is large, it will only damage the plastic layer 3 on the upper surface of the cover plate 1, and will not directly damage the cover plate 1, thereby preventing the cover plate 1 from being damaged and causing the LCD screen to be unable to be used normally, thereby bringing a better user experience to users and improving the anti-fall ability of the LCD screen.
[0039] Furthermore, the shape of the groove 14 can be square or circular, and the cross-sectional shape of the groove 14 can be a closing groove that is narrow on the outside and wide on the inside. In the present embodiment, the cross-sectional shape of the groove 14 is an isosceles trapezoid, and the groove 14 is in the shape of an elongated strip. The isosceles trapezoid-shaped groove 14 can allow the plastic layer 3 to be tightly embedded in the groove 14, thereby preventing the groove 14 from being separated from the plastic layer 3, thereby preventing the cover plate 1 from falling off from the plastic layer 3. The elongated groove 14 can increase the fitting portion between the plastic layer 3 and the groove 14, thereby increasing the fitting strength between the groove 14 and the plastic layer 3.
[0040] Example 3
[0041] See also Figure 1 and Figure 6 As a further optimization scheme of Example 1, in this embodiment, the TFT module 100 includes a lower polarizer 4, a lower substrate 5, an upper substrate 6 and an upper polarizer 7 which are sequentially stacked from bottom to top. The lower substrate 5 is longer than the upper substrate 6 and extends outward to form a step. The upper surface of the lower substrate 5 located at the step is bound with a driver IC and FPC8. Two reinforcing plates 9 are arranged staggered on both sides of FPC8. In the traditional FPC8 design, reinforcing plates 9 are usually not provided or are arranged at the same position and have the same width, resulting in the pressure applied when plugging and unplugging FPC8 being concentrated on the same straight line, resulting in a micro-break in the FPC8 line. Since the two reinforcing plates 9 of the FPC8 provided by the utility model are respectively located on both sides of the connecting part and staggered, when the FPC8 is pulled out, the pressure of the reinforcing plates 9 on both sides to the FPC8 is not on the same line segment, and the stress will not be concentrated on the same straight line when bending, thereby avoiding stress concentration and the problem of easy micro-breaks in the line at the gold finger, and improving the product yield.
[0042] Furthermore, the two mutually staggered reinforcing plates 9 referred to in the utility model can be respectively arranged at two different positions; or the center point position can be the same, but the widths of the two reinforcing plates 9 are different. It is sufficient to make the stress of the two reinforcing plates 9 not be concentrated on the same straight line when they are bent. This can avoid stress concentration and the problem of easy micro-breakage of the line at the gold finger, thereby improving the product yield. In this embodiment, the reinforcing plates 9 include a first reinforcing plate and a second reinforcing plate. The widths of each reinforcing plate 9 are different, and their center points are on the same horizontal line, so that the edges of the reinforcing plates 9 are staggered and not concentrated on the same straight line.
[0043] Furthermore, the material of the reinforcing plate 9 is FR4, PI or stainless steel. In other embodiments, if the heat generated by the FPC 8 is relatively large, a heat dissipation material with better heat dissipation effect, such as an aluminum foil reinforcing plate 9, may also be used.
[0044] Furthermore, the outer surfaces of the first reinforcement plate and the second reinforcement plate are both provided with a surface treatment layer for increasing the surface roughness, so as to increase the friction between the staff and the first reinforcement plate and the second reinforcement plate, so that the FPC8 is easy to pull out.
[0045] Furthermore, the surface treatment layer is provided with diamond knurling on the outer surfaces of the first reinforcement plate and the second reinforcement plate, so that the FPC8 can be pulled out more easily, reducing the risk of the FPC8 circuit being broken.
[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0047] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.
Claims
1. A liquid crystal display screen whose cover plate visible area is smaller than the TFT module visible area, characterized in that: It includes a TFT module and a cover plate arranged above the TFT module, a light-shielding ink layer is arranged on the lower surface of the cover plate, the light-shielding ink layer has a U-shaped opening, the U-shaped opening forms a visible area of the cover plate, the area of the TFT visible area of the TFT module is larger than the area of the visible area of the cover plate, a PET film is pasted on the lower surface of the cover plate located in the TFT visible area and at the light-shielding ink layer, a water glue is arranged between the cover plate and the TFT module, and the water glue covers the light-shielding ink layer, the PET film and the lower surface of the cover plate located in the visible area of the cover plate.
2. The liquid crystal display screen according to claim 1, wherein the visible area of the cover plate is smaller than the visible area of the TFT module, characterized in that: The light-shielding ink layer is frame-shaped, and the width of the light-shielding ink layer at the bottom of the lower surface of the cover plate is greater than the width of the light-shielding ink layer at the left, right and top of the lower surface of the cover plate. The TFT module portion below the light-shielding ink layer at the bottom is a visible area, and the PET film is arranged on the light-shielding ink layer at the bottom of the lower surface of the cover plate.
3. The liquid crystal display screen according to claim 1, wherein the visible area of the cover plate is smaller than the visible area of the TFT module, A plurality of grooves are formed on the upper surface of the cover plate by etching, and a plastic layer is covered on the upper side of the cover plate, and the plastic layer is embedded in the plurality of grooves.
4. The liquid crystal display screen according to claim 3, wherein the visible area of the cover plate is smaller than the visible area of the TFT module, The shape of the groove is square or circular.
5. The liquid crystal display screen according to claim 3, wherein the visible area of the cover plate is smaller than the visible area of the TFT module, The groove is a closing groove which is narrow outside and wide inside.
6. The liquid crystal display screen according to claim 5, wherein the visible area of the cover plate is smaller than the visible area of the TFT module, The cross-sectional shape of the groove is an isosceles trapezoid.
7. The liquid crystal display screen according to claim 1, wherein the visible area of the cover plate is smaller than the visible area of the TFT module, The TFT module includes a lower polarizer, a lower substrate, an upper substrate and an upper polarizer stacked in sequence from bottom to top. The lower substrate is longer than the upper substrate and extends outward to form a step. The upper surface of the lower substrate located at the step is bound with a driver IC and an FPC.
8. The liquid crystal display screen according to claim 7, wherein the visible area of the cover plate is smaller than the visible area of the TFT module, Two reinforcing plates are arranged staggered with each other on both sides of the FPC.
9. The liquid crystal display screen according to claim 8, wherein the visible area of the cover plate is smaller than the visible area of the TFT module, The widths of the two reinforcing plates are different.
10. The liquid crystal display screen according to claim 8, wherein the visible area of the cover plate is smaller than the visible area of the TFT module, The outer surfaces of the two reinforcing plates are both provided with a surface treatment layer for improving the surface roughness.