Display module

Abstract

The invention provides a display module. The display module sequentially comprises an active layer, a display layer, an isolation layer, a first adhesive layer, at least one light guide layer, a second adhesive layer and at least one light transmitting layer along a stacking direction, the display module further comprises a first frame glue structure and a second frame glue structure. The first frame glue structure is arranged around the first glue layer, and the adhesive force of the first frame glue structure is larger than that of the first glue layer. The second frame glue structure is arranged on the periphery of the second glue layer, and the adhesive force of the second frame glue structure is larger than that of the second glue layer.

Description

Technical Field

[0001] This invention relates to a display module, and more particularly to an electronic paper display module. Background Technology

[0002] Electronic paper displays are a new type of display device that is thin, durable, and consumes little power, meeting the requirements of energy conservation and environmental protection. They have been widely used in the market for e-readers (e.g., e-books or electronic newspapers) or other electronic components (e.g., electronic labels).

[0003] However, in current display module stack structures, the different coefficients of thermal expansion of different layers easily lead to expansion and deformation or material cracking due to heat. Furthermore, in multi-layer stack structures, the curing process of the adhesive can also cause warping. Therefore, designing a heat-resistant and highly reliable stack structure is one of the goals that this field is striving to achieve. Summary of the Invention

[0004] The present invention provides a display module that can avoid thermal expansion and deformation, thereby improving the overall structural strength.

[0005] This invention provides a display module, which sequentially includes, along the stack direction, an active layer, a display layer, an insulating layer, a first adhesive layer, at least one light-guiding layer, a second adhesive layer, and at least one light-transmitting layer. The display module also includes a first frame adhesive structure and a second frame adhesive structure. The first frame adhesive structure is disposed around the first adhesive layer, and the adhesive strength of the first frame adhesive structure is greater than that of the first adhesive layer. The second frame adhesive structure is disposed around the second adhesive layer, and the adhesive strength of the second frame adhesive structure is greater than that of the second adhesive layer.

[0006] In one embodiment of the present invention, the above-mentioned display module meets at least one of the following conditions: (1) the adhesive force of the first frame adhesive structure is greater than 1.5 times the adhesive force of the first adhesive layer; and (2) the adhesive force of the second frame adhesive structure is greater than 1.5 times the adhesive force of the second adhesive layer.

[0007] In one embodiment of the present invention, the adhesive force of at least one of the first frame adhesive structure and the second frame adhesive structure is greater than 6 kg / inch.

[0008] In one embodiment of the present invention, the adhesion force of at least one of the first adhesive layer and the second adhesive layer is less than 5 kg / inch.

[0009] In one embodiment of the present invention, the first frame adhesive structure and the second frame adhesive structure are substantially the same.

[0010] In one embodiment of the present invention, the width of at least one of the first frame adhesive structure and the second frame adhesive structure is greater than or equal to 1 mm and less than or equal to 3 mm.

[0011] In one embodiment of the present invention, the thickness of at least one of the first frame adhesive structure and the second frame adhesive structure is greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0012] In one embodiment of the present invention, the above-mentioned display module meets at least one of the following conditions: (1) the thickness of the first frame adhesive structure is equal to the thickness of the first adhesive layer; and (2) the thickness of the second frame adhesive structure is equal to the thickness of the second adhesive layer.

[0013] In one embodiment of the present invention, the first frame adhesive structure and the second frame adhesive structure completely overlap in the stacking direction described above.

[0014] In one embodiment of the present invention, the above-mentioned display module further includes a third frame adhesive structure disposed around the insulating layer and the display layer to connect the insulating layer, the display layer and the active layer.

[0015] In one embodiment of the present invention, the aforementioned third frame adhesive structure is further disposed on the top side surface of the active layer.

[0016] In one embodiment of the present invention, the Young's modulus of the third frame adhesive structure is less than 200 million Pascals.

[0017] In one embodiment of the present invention, the thermal expansion coefficient of the insulating layer is greater than that of the active layer.

[0018] In one embodiment of the present invention, the coefficient of thermal expansion of the display layer is greater than that of the active layer.

[0019] In one embodiment of the present invention, the material of the at least one light guide layer is plastic.

[0020] In one embodiment of the present invention, the coefficient of thermal expansion of at least one light-guiding layer is greater than 10 times that of at least one light-transmitting layer.

[0021] In one embodiment of the present invention, the coefficient of thermal expansion of at least one light guide layer is greater than 10 times that of the active layer.

[0022] In one embodiment of the present invention, the thickness of the at least one light-transmitting layer is greater than the thickness of the at least one light-guiding layer.

[0023] In one embodiment of the present invention, the thickness of at least one light guide layer is greater than the thickness of the active layer.

[0024] The present invention also provides a display module, which sequentially includes an active layer, a display layer, an insulating layer, a first adhesive layer, at least one light guide layer, a second adhesive layer, and at least one light-transmitting layer along the stack direction. The display module further includes an anti-warping frame adhesive structure disposed around the insulating layer and the display layer to connect the insulating layer, the display layer, and the active layer, wherein the Young's modulus of the anti-warping frame adhesive structure is less than 100 million Pascals.

[0025] Based on the above, in the display module of the present invention, the display module sequentially includes an active layer, a display layer, an insulating layer, a first adhesive layer, at least one light guide layer, a second adhesive layer, and at least one light-transmitting layer along the stack direction. Furthermore, the display module also includes a first frame adhesive structure and a second frame adhesive structure. The first frame adhesive structure is disposed around the first adhesive layer, and the adhesive strength of the first frame adhesive structure is greater than that of the first adhesive layer. The second frame adhesive structure is disposed around the second adhesive layer, and the adhesive strength of the second frame adhesive structure is greater than that of the second adhesive layer. In this way, in large-size display architectures, thermal expansion deformation caused by a large difference in the coefficients of thermal expansion between the light guide layer and other structures can be avoided, thereby improving the overall structural strength of the display device.

[0026] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a cross-sectional schematic diagram of a display module according to an embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional schematic diagram of a display module according to another embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures

[0030] 100, 100A: Display modules;

[0031] 110: Active layer;

[0032] 120: Display layer;

[0033] 130: Insulation layer;

[0034] 140: First adhesive layer;

[0035] 150: Light guide layer;

[0036] 160: Second adhesive layer;

[0037] 170: Translucent layer;

[0038] 172: First sub-transparent layer;

[0039] 174: Second sub-transparent layer;

[0040] 176: Connect the light-transmitting adhesive layer;

[0041] 210: First frame adhesive structure;

[0042] 220: Second frame adhesive structure;

[0043] 230: Third frame adhesive structure;

[0044] D: Stack direction. Detailed Implementation

[0045] Figure 1 This is a cross-sectional schematic diagram of a display module according to an embodiment of the present invention. Please refer to... Figure 1 This embodiment provides a display module 100, such as electronic paper (ePaper), or an electronic paper module, which can be applied to e-readers (or e-books), electronic paper notebooks, interactive whiteboards, electronic identification cards, electronic billboards, electronic labels, laptops, monitors, mobile phone accessories, clothing accessories, electronic device exteriors, smart wearable devices, etc., to display images using ambient light as the primary light source. The display module 100 of this embodiment can be applied in large-size applications, where large size can be defined as greater than 75 inches.

[0046] The display module 100 includes, in sequence along the stack direction D, an active layer 110, a display layer 120, an insulating layer 130, a first adhesive layer 140, at least one light guide layer 150, a second adhesive layer 160, and at least one light-transmitting layer 170. The active layer 110 is, for example, a thin-film transistor (TFT) with a glass substrate, electrically connected to the display layer 120, and used to electrically drive the display layer 120.

[0047] Display layer 120 is, for example, an electrophoretic ink comprising multiple microcapsules, electrically connected to active layer 110, used to change the position of the multiple microcapsules according to the electrical state of active layer 110, and to display an image by reflecting ambient light. This invention does not limit the type of display layer 120. In this embodiment, the coefficient of thermal expansion of display layer 120 is greater than that of active layer 110.

[0048] The insulating layer 130, for example, is a water-resistant material used to cover and protect the display layer 120 to prevent moisture and other external factors from entering. In this embodiment, the coefficient of thermal expansion of the insulating layer 130 is greater than that of the active layer 110.

[0049] The light guide layer 150 is, for example, a light guide plate made of plastic, used to guide and homogenize the light beam. In this embodiment, the number of light guide layers 150 is, for example, one. However, in different embodiments, the number of light guide layers 150 may be designed to be multiple, and a connecting light-transmitting adhesive layer is disposed between two adjacent light guide layers 150, but the present invention is not limited thereto. In this embodiment, the coefficient of thermal expansion of the light guide layer 150 is greater than 10 times that of the active layer 110. Furthermore, in this embodiment, the thickness of the light guide layer 150 is greater than the thickness of the active layer 110.

[0050] The light-transmitting layer 170 is, for example, a protective cover made of glass, used to cover and protect the light-guiding layer 150 to prevent moisture and other external factors from entering. The light-transmitting layer 170 can have multiple light-transmitting structures. For example, in this embodiment, the light-transmitting layer 170 includes a first sub-light-transmitting layer 172, a second sub-light-transmitting layer 174, and a connecting light-transmitting adhesive layer 176 connecting the first sub-light-transmitting layer 172 and the second sub-light-transmitting layer 174. However, in different embodiments, the light-transmitting layer 170 can also be designed as a single protective cover; the invention is not limited thereto. In this embodiment, the coefficient of thermal expansion of the light-guiding layer 150 is greater than 10 times that of the light-transmitting layer 170. Furthermore, in this embodiment, the thickness of the light-transmitting layer 170 is greater than the thickness of the light-guiding layer 150.

[0051] The first adhesive layer 140 and the second adhesive layer 160 are, for example, light-transmitting adhesive layers, respectively connected between the insulating layer 130 and the light-guiding layer 150 and between the light-guiding layer 150 and the light-transmitting layer 170. At least one of the first adhesive layer 140 and the second adhesive layer 160 has an adhesive strength of less than 5 kg / in. For example, in this embodiment, the adhesive strength of both the first adhesive layer 140 and the second adhesive layer 160 is between 3 and 4 kg / in.

[0052] The display module 100 further includes a first frame adhesive structure 210 and a second frame adhesive structure 220, respectively disposed around the first adhesive layer 140 and the second adhesive layer 160. In this embodiment, the first frame adhesive structure 210 and the second frame adhesive structure 220 are substantially the same, with the thickness of the first frame adhesive structure 210 equal to the thickness of the first adhesive layer 140, and the thickness of the second frame adhesive structure 220 equal to the thickness of the second adhesive layer 160, but the invention is not limited thereto. In the stacking direction D, the first frame adhesive structure 210 and the second frame adhesive structure 220 completely overlap. Furthermore, the outer edges of the first frame adhesive structure 210 and the second frame adhesive structure 220 can be aligned with the edges of adjacent structures in the upper and lower layers (i.e., the first sub-light-transmitting layer 172, the light-guiding layer 150, and the insulating layer 130), but the invention is not limited thereto either.

[0053] Specifically, in terms of structural design, the width of the first frame adhesive structure 210 is greater than or equal to 1 mm and less than or equal to 3 mm, and the thickness of the first frame adhesive structure 210 is greater than or equal to 0.5 mm and less than or equal to 2 mm. The width of the second frame adhesive structure 220 is greater than or equal to 1 mm and less than or equal to 3 mm, and the thickness of the second frame adhesive structure 220 is greater than or equal to 0.5 mm and less than or equal to 2 mm. Furthermore, the adhesive strength of the first frame adhesive structure 210 is greater than 6 kg / in and greater than the adhesive strength of the first adhesive layer 140. The adhesive strength of the second frame adhesive structure 220 is greater than 6 kg / in and greater than the adhesive strength of the second adhesive layer 160. For example, in this embodiment, the adhesive strength of the first frame adhesive structure 210 is greater than 1.5 times the adhesive strength of the first adhesive layer 140, and the adhesive strength of the second frame adhesive structure 220 is greater than 1.5 times the adhesive strength of the second adhesive layer 160. In this way, in large-size display architectures, thermal expansion deformation caused by the large difference in thermal expansion coefficients between the light guide layer 150 and other structures can be avoided, thereby improving the overall structural strength of the display device.

[0054] On the other hand, in this embodiment, the display module 100 further includes a third frame adhesive structure 230, disposed around the insulating layer 130 and the display layer 120, for connecting the insulating layer 130, the display layer 120, and the active layer 110. In this embodiment, the third frame adhesive structure 230 is also disposed on the top surface of the active layer 110. In other words, unlike the first frame adhesive structure 210 and the second frame adhesive structure 220, the shape of the third frame adhesive structure 230 extends from the side of the insulating layer 130 to the top surface of the active layer 110, such as... Figure 1 As shown. Furthermore, in this embodiment, the Young's modulus of the third frame adhesive structure 230 is less than 200 megapascals. This prevents warping between the insulating layer 130 and the display layer 120 due to their lower coefficients of thermal expansion compared to the active layer 110, thereby improving the overall structural strength of the display device.

[0055] Figure 2 This is a cross-sectional schematic diagram of a display module according to another embodiment of the present invention. Please refer to... Figure 2 The display module 100A shown in this embodiment is similar to... Figure 1 The display module 100 is shown. The difference between the two is that, in this embodiment, the display module 100A does not include... Figure 1 The first frame adhesive structure 210 and the second frame adhesive structure 220 are shown. Therefore, in this embodiment, a third frame adhesive structure 230 (or anti-warping frame adhesive structure) with a smaller Young's modulus is required. For example, in this embodiment, the Young's modulus of the third frame adhesive structure 230 is less than 100 million Pascals. In this way, warping of the insulating layer 130 and the display layer 120 due to their lower coefficient of thermal expansion than the active layer 110 can be avoided, thereby improving the overall structural strength of the display device.

[0056] In summary, in the display module of the present invention, the display module sequentially includes an active layer, a display layer, an insulating layer, a first adhesive layer, at least one light guide layer, a second adhesive layer, and at least one light-transmitting layer along the stack direction. Furthermore, the display module also includes a first frame adhesive structure and a second frame adhesive structure. The first frame adhesive structure is disposed around the first adhesive layer, and the adhesive strength of the first frame adhesive structure is greater than that of the first adhesive layer. The second frame adhesive structure is disposed around the second adhesive layer, and the adhesive strength of the second frame adhesive structure is greater than that of the second adhesive layer. In this way, in large-size display architectures, thermal expansion deformation caused by a large difference in the coefficients of thermal expansion between the light guide layer and other structures can be avoided, thereby improving the overall structural strength of the display device.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display module, characterized by The display module comprises, in sequence along a stacking direction, an active layer, a display layer, an insulation layer, a first adhesive layer, at least one light guide layer, a second adhesive layer, and at least one light transmission layer. A first frame adhesive structure is disposed around the first adhesive layer, and the adhesive force of the first frame adhesive structure is greater than the adhesive force of the first adhesive layer. A second frame adhesive structure is disposed around the second adhesive layer, and the adhesive force of the second frame adhesive structure is greater than the adhesive force of the second adhesive layer.

2. The display module of claim 1, wherein, The display module satisfies at least one of the following conditions: (1) the adhesive force of the first frame adhesive structure is greater than 1.5 times the adhesive force of the first adhesive layer; and (2) the adhesive force of the second frame adhesive structure is greater than 1.5 times the adhesive force of the second adhesive layer.

3. The display module of claim 1, wherein, The adhesive force of at least one of the first frame adhesive structure and the second frame adhesive structure is greater than 6 kg / inch.

4. The display module of claim 1, wherein, The adhesive force of at least one of the first adhesive layer and the second adhesive layer is less than 5 kg / inch.

5. The display module of claim 1, wherein, The first frame adhesive structure and the second frame adhesive structure are substantially the same.

6. The display module of claim 1, wherein, The width of at least one of the first frame adhesive structure and the second frame adhesive structure is greater than or equal to 1 mm and less than or equal to 3 mm.

7. The display module of claim 1, wherein, The thickness of at least one of the first frame adhesive structure and the second frame adhesive structure is greater than or equal to 0.5 mm and less than or equal to 2 mm.

8. The display module of claim 1, wherein, The display module satisfies at least one of the following conditions: (1) the thickness of the first frame adhesive structure is equal to the thickness of the first adhesive layer; and (2) the thickness of the second frame adhesive structure is equal to the thickness of the second adhesive layer.

9. The display module of claim 1, wherein, In the stacking direction, the first frame adhesive structure and the second frame adhesive structure completely overlap.

10. The display module of claim 1, wherein, The display module further comprises: A third frame adhesive structure is disposed around the insulation layer and the display layer to connect the insulation layer, the display layer, and the active layer.

11. The display module of claim 10, wherein, The third frame adhesive structure is also disposed on the top side surface of the active layer.

12. The display module of claim 10, wherein, The Young's modulus of the third frame adhesive structure is less than 200 MPa.

13. The display module of claim 1, wherein, The coefficient of thermal expansion of the insulation layer is greater than the coefficient of thermal expansion of the active layer.

14. The display module of claim 1, wherein, The coefficient of thermal expansion of the display layer is greater than the coefficient of thermal expansion of the active layer.

15. The display module of claim 1, wherein, The material of the at least one light guide layer is plastic.

16. The display module of claim 1, wherein, The coefficient of thermal expansion of the at least one light guide layer is greater than 10 times the coefficient of thermal expansion of the at least one light transmission layer.

17. The display module of claim 1, wherein, The coefficient of thermal expansion of the at least one light guide layer is greater than 10 times the coefficient of thermal expansion of the active layer.

18. The display module of claim 1, wherein, The thickness of the at least one light transmission layer is greater than the thickness of the at least one light guide layer.

19. The display module of claim 1, wherein, The thickness of the at least one light guide layer is greater than the thickness of the active layer.

20. A display module, characterized by The display module comprises, in sequence along a stacking direction, an active layer, a display layer, an insulation layer, a first adhesive layer, at least one light guide layer, a second adhesive layer, and at least one light transmission layer. A warpage prevention frame adhesive structure is disposed around the insulation layer and the display layer to connect the insulation layer, the display layer, and the active layer, and the Young's modulus of the warpage prevention frame adhesive structure is less than 100 MPa.

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