Display device
By setting a protective tape with a friction coefficient of less than 0.5 on the lubricating surface between the backlight module backplate and the flexible circuit board, the problem of abnormal noise during the torsion and deformation of the flexible circuit board was solved, and the abnormal noise was significantly reduced and the stability was improved.
Patent Information
- Application Number
- CN202520462528.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-14
AI Technical Summary
In the existing technology, flexible circuit boards generate significant brittle noises during the twisting and deformation of display devices due to the high coefficient of friction with ordinary protective single-sided tape, and it is difficult to ensure consistency in mass production.
A protective tape with a lubricating surface is placed between the backplate of the backlight module and the flexible circuit board. The lubricating surface faces the inside of the flexible circuit board, and the coefficient of friction is less than 0.5. It includes a multi-layer structure of single-sided or double-sided tape and lubricating film layer.
It significantly reduces the friction of flexible circuit boards during torsion and deformation, avoids the generation of abnormal noise, and improves the noise performance, stability, and user experience of display devices.
Smart Images
Figure CN223827934U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display technology, and more specifically to a display device. Background Technology
[0002] In the display device of a laptop computer, the flexible printed circuit (FPC) needs to be bent from the front of the display panel to the back of the backlight module and attached to the back plate of the backlight unit (BLU) along with the printed circuit board assembly (PCBA).
[0003] In practical applications, the flexible circuit board will be in direct contact with the back panel of the backlight module. Since the back panel of the backlight module is usually made of metal, its surface may have burrs or uneven areas. These burrs or uneven areas can easily cause the flexible circuit board to be scratched or punctured, which can lead to display abnormalities such as short circuits or screen distortion.
[0004] To avoid this situation, existing technologies typically employ a method of attaching a layer of protective single-sided tape to the location of the flexible circuit board corresponding to the back panel of the backlight module, in order to isolate the back panel and the flexible circuit board and prevent damage to the flexible circuit board.
[0005] However, in practical applications, when the display device is subjected to external forces and twists, the green solder mask surface of the flexible circuit board will experience relative movement and friction with the protective single-sided tape. Because the coefficient of friction between the surface of the ordinary protective single-sided tape and the green solder mask surface of the flexible circuit board is relatively high, the protective single-sided tape and the flexible circuit board will generate significant resistance during relative movement. As the degree of twisting and deformation continues to increase, the flexible circuit board, which has temporarily stopped moving due to the resistance, will suddenly overcome the friction and spring back, producing a loud, crisp, abnormal noise. This noise often has a large amplitude and can easily lead to user complaints about product quality.
[0006] Currently, there is limited research on solutions to this problem of FPC distortion noise in existing technologies. Generally, the problem can only be mitigated through manual adjustments during assembly, but due to human factors, the effectiveness of this method is inconsistent, making it difficult to ensure product consistency in mass production, and the noise reduction effect is poor.
[0007] Therefore, it is necessary to propose a new technical solution to solve the above-mentioned technical problems. Utility Model Content
[0008] The purpose of embodiments of this application is to provide a display device that improves the noise performance of the display device during the torsion and deformation process.
[0009] Embodiments of the present application provide a display device, comprising: a display panel; a backlight module; a printed circuit board disposed on a back surface of the backlight module; a flexible circuit board, one end of the flexible circuit board being electrically connected to an edge portion of a front surface of the display panel, the flexible circuit board being bent from the front surface of the display panel to the back surface of the backlight module, the other end of the flexible circuit board being electrically connected to the printed circuit board; and a protective tape, the protective tape being disposed on a back plate of the backlight module and located between the flexible circuit board and the back plate of the backlight module, the protective tape comprising an adhesive surface and a lubricating surface, the adhesive surface being attached to the back plate of the backlight module, the lubricating surface facing an inner side surface of the flexible circuit board.
[0010] In the above display device, the protective tape is a single-sided tape, the single-sided tape comprising a first glue layer, a first substrate layer and a first lubricating coating layer, the first glue layer being attached to the back plate of the backlight module, the first substrate layer being disposed on the first glue layer, the first lubricating coating layer being disposed on a side of the first substrate layer away from the first glue layer.
[0011] In the above display device, the first lubricating coating layer is a release agent coating layer.
[0012] In the above display device, the protective tape comprises a double-sided tape and a lubricating film layer, one side of the double-sided tape being attached to the back plate of the backlight module, the other side of the double-sided tape being attached to a non-lubricating surface of the lubricating film layer, a lubricating surface of the lubricating film layer facing the inner side surface of the flexible circuit board.
[0013] In the above display device, the lubricating film layer is a single-sided release film.
[0014] In the above display device, the double-sided tape comprises a second glue layer, a second substrate layer and a third glue layer, the second glue layer being attached to the back plate of the backlight module, the second substrate layer being disposed on the second glue layer, the third glue layer being disposed on the second substrate layer and attached to the non-lubricating surface of the lubricating film layer.
[0015] In the above display device, the lubricating film layer comprises a third substrate layer and a second lubricating coating layer, the third substrate layer being attached to the double-sided tape, the second lubricating coating layer being disposed on a side of the third substrate layer away from the double-sided tape.
[0016] In the above display device, along a length direction of the edge portion of the display panel, a size of the protective tape is greater than a size of the flexible circuit board.
[0017] In the display device, the protective tape is arranged on the back of the backlight module and the side of the backlight module, and the protective tape covers the corner of the connection between the back of the backlight module and the side of the backlight module.
[0018] In the display device, the friction coefficient of the lubricating surface of the protective tape is less than 0.5.
[0019] In the display device, by arranging the protective tape with a lubricating surface between the back plate of the backlight module and the flexible circuit board, the problem of distorted noise caused by the large friction coefficient between the flexible circuit board and the ordinary protective single-sided tape in the prior art is effectively solved. Specifically, the protective tape includes an adhesive surface and a lubricating surface, the adhesive surface is attached to the back plate of the backlight module, and the lubricating surface faces the inner side of the flexible circuit board, so that the inner side of the flexible circuit board is in contact with the surface with lubricating properties instead of the surface of the ordinary tape. The friction coefficient of the lubricating surface is significantly lower than that of the surface of the ordinary tape. When the display device is distorted, the friction between the flexible circuit board and the lubricating surface is greatly reduced, thereby avoiding the brittle noise caused by the sudden rebound of the flexible circuit board due to friction resistance. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 FIG. 1 is a schematic diagram of a display device provided by an embodiment of the present application.
[0021] Figure 2 FIG. 2 is a cross-sectional view of a first embodiment of the display device provided by the present application.
[0022] Figure 3 FIG. 3 is a schematic diagram of the protective tape of the display device shown in FIG. 1. Figure 2
[0023] Figure 4 FIG. 4 is a cross-sectional view of a second embodiment of the display device provided by the present application.
[0024] Figure 5 FIG. 5 is a schematic diagram of the protective tape of the display device shown in FIG. 4. Figure 4 DETAILED DESCRIPTION
[0025] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0026] The terms "first", "second", and similar words do not represent any order, number, or importance, but are only used to distinguish different technical features. The term "multiple" and similar words represent two or more, unless otherwise explicitly limited.
[0027] Embodiments of the present application can be combined with each other.
[0028] AsFigures 2 to 5 As shown in the drawings, in order to solve the technical problem that the flexible circuit board 204 suddenly overcomes the frictional force and bounces out, so that a larger brittle sound is generated, the display device provided by the present application includes: a display panel 201; a backlight module 202; a printed circuit board 203 arranged on the back of the backlight module 202; a flexible circuit board 204, one end of the flexible circuit board 204 is electrically connected with the edge part of the front surface of the display panel 201, the flexible circuit board 204 is bent from the front surface of the display panel 201 to the back of the backlight module 202, and the other end of the flexible circuit board 204 is electrically connected with the printed circuit board 203; and a protective tape 205, the protective tape 205 is arranged on the back plate of the backlight module 202 and located between the flexible circuit board 204 and the back plate of the backlight module 202, the protective tape 205 includes an adhesive surface and a lubricating surface, the adhesive surface is attached to the back plate of the backlight module 202, and the lubricating surface faces the inner side surface of the flexible circuit board 204.
[0029] The flexible circuit board 204 is fixed with the back plate of the backlight module 202 through the printed circuit board 203 assembly. The backlight module 202 includes a backlight unit and the back plate, and the back plate is arranged on the back of the backlight unit.
[0030] As shown in the drawings, the display device further includes a timing controller TCON, a source driving circuit DD and a power management chip (not shown in the drawings, the power management chip can be integrated into the same chip as the timing controller TCON). The display panel can be, for example, a liquid crystal display panel. Figure 1
[0031] The display panel includes a display area and a non-display area. The display area is provided with m×n pixels P arranged in an array, where m and n are integers greater than 1. The non-display area is located at the periphery of the display area and is used to arrange driving circuits and various signal lines. The display panel further includes a plurality of scan lines (GL1-GLn), a plurality of data lines (DL1-DLm) and a gate driving circuit GOA. The plurality of scan lines (GL1-GLn) extend along a first direction and are arranged along a second direction, and the plurality of data lines (DL1-DLm) extend along the second direction and are arranged along the first direction, the first direction being perpendicular to the second direction. The gate driving circuit GOA is arranged in the non-display area and is electrically connected with the plurality of scan lines (GL1-GLn). The source driving circuit DD is electrically connected with the plurality of data lines (DL1-DLm) through the flexible circuit board. The timing controller TCON is electrically connected with the gate driving circuit GOA and the source driving circuit DD respectively.
[0032] The display panel includes a thin-film transistor array substrate, a counter substrate, and a liquid crystal layer disposed between the two substrates. The thin-film transistor array substrate includes a glass substrate, a first metal layer disposed on the glass substrate, a gate insulating layer disposed on the first metal layer, a semiconductor layer disposed on the gate insulating layer, a second metal layer disposed on the semiconductor layer, a passivation layer disposed on the second metal layer, and pixel electrodes disposed on the passivation layer. The first metal layer includes scan lines (GL1-GLn), gate electrodes, etc. The second metal layer includes data lines (DL1-DLm), source electrodes, drain electrodes, etc. The counter substrate includes a glass substrate, a black matrix disposed on the glass substrate, a color filter layer disposed on the black matrix, and a common electrode disposed on the color filter layer.
[0033] Each pixel P includes at least one thin-film transistor (TFT) and a pixel electrode. The gate of the TFT is electrically connected to the corresponding scan line, the source is electrically connected to the corresponding data line, and the drain is electrically connected to the corresponding pixel electrode. When the scan line outputs a high-level scan signal, the TFT is turned on, and the data signal on the data line is transmitted to the pixel electrode through the TFT; when the scan line outputs a low-level scan signal, the TFT is turned off, and the pixel electrode maintains the voltage corresponding to the data signal.
[0034] The gate drive circuit GOA includes n cascaded gate drive sub-circuits, each electrically connected to a scan line. Under the control of the timing controller TCON, the gate drive sub-circuits sequentially output scan signals, scanning each row of pixels P in the display area line by line. The source drive circuit DD, under the control of the timing controller TCON, generates and outputs data signals based on the image data. The timing controller TCON receives and processes externally input image data and timing signals, generates control signals, and transmits the image data to the source drive circuit DD. The power management chip provides operating voltages to various parts of the display device, including a common voltage for the common electrode of the liquid crystal display panel, a gate drive voltage for the gate drive circuit GOA, and a gamma voltage for the source drive circuit DD.
[0035] like Figure 2 and Figure 3 As shown, in the first technical solution (first embodiment) of this application, the flexible circuit board 204 is bent from the edge of the front side of the display panel 201 to the back side of the backlight module 202 and fixed to the printed circuit board 203 disposed on the back plate of the backlight module 202. A protective tape 205 is disposed on the back plate of the backlight module 202 and located between the flexible circuit board 204 and the back plate of the backlight module 202.
[0036] Specifically, a layer of single-sided tape is attached to the backplate of the backlight module 202 at the position corresponding to the flexible circuit board 204. The single-sided tape includes an adhesive side and a lubricating side. The adhesive side is the side with adhesive, used to adhere to the backplate of the backlight module 202, and the lubricating side is the side coated with a lubricating coating, facing the inner surface of the flexible circuit board 204.
[0037] The single-sided tape has a multi-layer structure, and the thickness of the protective tape 205 is 0.01 mm to 0.5 mm.
[0038] Specifically, the single-sided tape includes a first adhesive layer 2051, a first substrate layer 2052, and a first lubricating coating 2053. The first adhesive layer 2051 is adhered to the back panel of the backlight module 202. The first substrate layer 2052 is disposed on the first adhesive layer 2051. The first lubricating coating 2053 is disposed on the side of the first substrate layer 2052 facing away from the first adhesive layer 2051. The first lubricating coating 2053 is a release agent coating. The first substrate layer 2052 is made of polyethylene terephthalate (PET) material.
[0039] The first lubricating coating 2053, which provides lubrication, adheres to the non-stick side of the single-sided tape. When the display device undergoes twisting and deformation, the inner surface of the flexible circuit board 204 comes into contact with the lubricating coating 2053. Because the first lubricating coating 2053 has a low coefficient of friction, it provides almost no resistance to the inner surface of the flexible circuit board 204, thus preventing the flexible circuit board 204 from suddenly springing open and producing noise. The coefficient of friction of the lubricated surface of the protective tape 205 is less than 0.5.
[0040] like Figure 4 and Figure 5 As shown, in the second technical solution (second embodiment) of this application, the flexible circuit board 204 is also bent from the edge of the front side of the display panel 201 to the back side of the backlight module 202 and fixed to the printed circuit board 203 disposed on the back plate of the backlight module 202. The protective tape 205 is disposed on the back plate of the backlight module 202 and is located between the flexible circuit board 204 and the back plate of the backlight module 202.
[0041] Specifically, a protective tape is attached to the backplate of the backlight module 202 at the position corresponding to the flexible circuit board 204. The protective tape 205 includes double-sided tape and a lubricating film layer. One side of the double-sided tape is attached to the backplate of the backlight module 202, and the other side of the double-sided tape is attached to the non-lubricated side of the lubricating film layer. The lubricated side of the lubricating film layer faces the inner side of the flexible circuit board 204. The lubricating film layer is a single-sided release film.
[0042] The protective tape 205 has a multi-layer structure. Specifically, the double-sided tape includes a second adhesive layer 2054, a second substrate layer 2055, and a third adhesive layer 2056. The second adhesive layer 2054 is bonded to the backplate of the backlight module 202. The second substrate layer 2055 is disposed on the second adhesive layer 2054. The third adhesive layer 2056 is disposed on the second substrate layer 2055 and bonded to the non-lubricated side of the lubricating film layer. The second substrate layer 2055 is made of polyethylene terephthalate (PET) material.
[0043] The lubricating film layer includes a third substrate layer 2057 and a second lubricating coating layer 2058. The third substrate layer 2057 is bonded to the double-sided adhesive tape, and the second lubricating coating layer 2058 is disposed on the side of the third substrate layer 2057 facing away from the double-sided adhesive tape. The third substrate layer 2057 is made of polyethylene terephthalate (PET). The lubricating film layer can be a single-sided release film, wherein the second lubricating coating layer 2058 is a release layer.
[0044] The lubricating surface of the lubricating film layer contacts the inner surface of the flexible circuit board 204. When the display device is twisted and deformed, the lubricating surface has a low coefficient of friction and will not impede the movement of the flexible circuit board 204, thus improving the problem of abnormal noise caused by the twisting of the flexible circuit board 204.
[0045] In both of the above technical solutions, along the length of the edge of the display panel 201, the size of the protective tape 205 is larger than the size of the flexible circuit board 204. The protective tape 205 is disposed on the back and sides of the backlight module 202, covering the edges at the connection between the back and sides of the backlight module 202. This arrangement provides more comprehensive protection for the flexible circuit board 204, preventing it from being scratched by the edges of the backlight module 202.
[0046] Both technical solutions provided in this application can effectively improve the noise problem of the flexible circuit board 204 that occurs when the display device is twisted and deformed, and improve the noise performance of the display device.
[0047] To verify the effectiveness of the technical solution provided in this application, we conducted a display device distortion and noise test. The test results are shown in Tables 1, 2, and 3 below:
[0048]
[0049] Table 1 Table 2
[0050]
[0051] Table 3
[0052] The test results clearly demonstrate that the average noise level of the display device during distortion is significantly reduced after adopting the two technical solutions of this application. The noise levels of the comparative technical solutions were mostly between 23-28 dB, with some exceeding the 25 dB specification requirement. However, after adopting the first technical solution of this application, the noise level stabilized between 17-19 dB; and after adopting the second technical solution, the noise level was further reduced to between 15-19 dB. These test data fully demonstrate that the technical solutions provided by this application can effectively reduce the noise generated by the display device during distortion, with an average noise reduction of approximately 7-9 dB, far below the 25 dB specification requirement, significantly improving product quality and user experience.
[0053] Furthermore, the test results also show that the two technical solutions provided in this application can not only reduce the abnormal noise value, but also improve the stability of the abnormal noise performance. In the comparative technical solutions, the three test results of the same sample fluctuated significantly, while after adopting the technical solutions of this application, the fluctuation of the three test results of the same sample was significantly reduced, which further proves the reliability and stability of the technical solutions of this application.
[0054] In the display device of this application, by providing a protective tape 205 with a lubricating surface between the backplate of the backlight module 202 and the flexible circuit board 204, the problem of twisting noise caused by the high coefficient of friction between the flexible circuit board 204 and ordinary protective single-sided tape in the prior art is effectively solved. Specifically, the protective tape 205 includes an adhesive surface and a lubricating surface. The adhesive surface is attached to the backplate of the backlight module 202, and the lubricating surface faces the inner side of the flexible circuit board 204. Therefore, the inner side of the flexible circuit board 204 can contact the surface with lubricating properties, rather than the surface of ordinary tape. The coefficient of friction of the lubricating surface is significantly lower than that of the ordinary tape surface. When the display device is twisted and deformed, the friction between the flexible circuit board 204 and the lubricating surface is greatly reduced, thereby avoiding the crisp noise caused by the flexible circuit board 204 suddenly springing open due to frictional resistance.
[0055] This application provides two specific structural schemes for the protective tape 205, both of which can effectively reduce the coefficient of friction between the flexible circuit board 204 and the protective tape 205. In the first scheme, the protective tape 205 is a single-sided tape, including a first adhesive layer 2051, a first substrate layer 2052, and a first lubricating coating 2053. The first lubricating coating 2053 is disposed on the side of the first substrate layer 2052 facing away from the first adhesive layer 2051, forming a lubricating surface. In the second scheme, the protective tape 205 includes a double-sided tape and a lubricating film layer, with the lubricating surface of the lubricating film layer facing the inner side of the flexible circuit board 204. Both structural schemes can reduce the coefficient of friction of the lubricated surface of the protective tape 205 to less than 0.5, significantly reducing the frictional force between the flexible circuit board 204 and the protective tape 205.
[0056] In the display device of this application, the protective tape 205 is not only disposed on the back side of the backlight module 202, but also on the side of the backlight module 202, covering the edges and corners at the connection between the back side and the side of the backlight module 202. This arrangement not only prevents the flexible circuit board 204 from being scratched by the back panel of the backlight module 202, but also prevents the flexible circuit board 204 from being scratched by the edges and corners of the backlight module 202, providing more comprehensive protection. At the same time, along the length of the edge of the display panel, the size of the protective tape 205 is larger than the size of the flexible circuit board 204, ensuring that the flexible circuit board 204 is effectively protected at any location.
[0057] Experimental testing verified that, after adopting the technical solution of this application, the average noise level generated by the display device during twisting and deformation was significantly reduced from the original 23-28 dB to 15-19 dB, a reduction of approximately 7-9 dB, far below the specification requirement of 25 dB. This test result fully demonstrates the effectiveness of the technical solution of this application, significantly improving the noise performance of the display device during twisting and deformation, enhancing the user experience, and reducing customer complaints caused by noise issues.
[0058] The embodiments of this application have been described in detail above. The content of this specification should not be construed as limiting the scope of protection of this application.
Claims
1. A display device, characterized in that, The display device includes: Display panel; Backlight module; A printed circuit board is disposed on the back side of the backlight module; A flexible circuit board, one end of which is electrically connected to the edge of the front side of the display panel, the flexible circuit board being bent from the front side of the display panel to the back side of the backlight module, and the other end of which is electrically connected to the printed circuit board; and A protective tape is disposed on the back plate of the backlight module and located between the flexible circuit board and the back plate of the backlight module. The protective tape includes an adhesive side and a lubricating side. The adhesive side is attached to the back plate of the backlight module, and the lubricating side faces the inner side of the flexible circuit board.
2. The display device according to claim 1, characterized in that, The protective tape is a single-sided tape, which includes a first adhesive layer, a first substrate layer, and a first lubricating coating. The first adhesive layer is attached to the back panel of the backlight module, the first substrate layer is disposed on the first adhesive layer, and the first lubricating coating is disposed on the side of the first substrate layer facing away from the first adhesive layer.
3. The display device according to claim 2, characterized in that, The first lubricating coating is a release agent coating.
4. The display device according to claim 1, characterized in that, The protective tape includes double-sided tape and a lubricating film layer. One side of the double-sided tape is attached to the back plate of the backlight module, and the other side of the double-sided tape is attached to the non-lubricated side of the lubricating film layer. The lubricated side of the lubricating film layer faces the inner side of the flexible circuit board.
5. The display device according to claim 4, characterized in that, The lubricating film layer is a single-sided release film.
6. The display device according to claim 4, characterized in that, The double-sided tape includes a second adhesive layer, a second substrate layer, and a third adhesive layer. The second adhesive layer is bonded to the backplate of the backlight module. The second substrate layer is disposed on the second adhesive layer. The third adhesive layer is disposed on the second substrate layer and bonded to the non-lubricated side of the lubricating film layer.
7. The display device according to claim 4, characterized in that, The lubricating film layer includes a third substrate layer and a second lubricating coating layer. The third substrate layer is bonded to the double-sided tape, and the second lubricating coating layer is disposed on the side of the third substrate layer facing away from the double-sided tape.
8. The display device according to claim 1, characterized in that, Along the length of the edge portion of the display panel, the size of the protective tape is larger than the size of the flexible circuit board.
9. The display device according to claim 1, characterized in that, The protective tape is applied to the back and sides of the backlight module, and covers the corners at the connection between the back and sides of the backlight module.
10. The display device according to claim 1, characterized in that, The coefficient of friction of the lubricated surface of the protective tape is less than 0.5.