Display device

Abstract

The invention provides a display device. The display device comprises a driving circuit substrate, a plurality of light-emitting elements and a shading pattern layer. The light-emitting element is arranged on the driving circuit substrate and electrically connected to the driving circuit substrate. The shading pattern layer is arranged on the driving circuit substrate and exposes the light emitting element. The shading pattern layer is provided with a first surface and a second surface which are opposite to the driving circuit substrate, and at least two of the light-emitting elements are respectively exposed on the first surface and the second surface. The distance between the first surface and the driving circuit substrate is smaller than the distance between the second surface and the driving circuit substrate.

Description

Technical Field

[0001] The present invention relates to a display device. Background Art

[0002] The splicing technology is one of the main methods to realize a large format display (LFD). This technology splices multiple display panels with smaller sizes to assemble a large-sized display. Generally speaking, if a brand or manufacturer's trademark is to be printed on a seamless splicing display (for example, a micro LED display), a special border needs to be made, and the trademark is printed on this border. However, this border still occupies a certain area, resulting in an increase in the area of the region on the display that is not used for displaying the picture, and reducing the area utilization rate of the display. In addition, in order not to affect the picture continuity of the large-sized display, the above-mentioned border must be set at the edge of the display, so the position where the trademark is set is also limited to the edge of the display. Summary of the Invention

[0003] Therefore, an embodiment of the present invention provides a display device, which helps to improve the area utilization rate of the display device.

[0004] At least one embodiment of the present invention provides a display device, which includes a driving circuit substrate, a plurality of light-emitting elements, and a light-shielding pattern layer. The light-emitting elements are disposed on the driving circuit substrate and electrically connected to the driving circuit substrate. The light-shielding pattern layer is disposed on the driving circuit substrate and exposes the light-emitting elements. The light-shielding pattern layer has a first surface and a second surface facing away from the driving circuit substrate, and at least two of these light-emitting elements are respectively exposed on the first surface and the second surface. The distance between the first surface and the driving circuit substrate is less than the distance between the second surface and the driving circuit substrate.

[0005] In at least one embodiment of the present invention, the distance between the first surface and the second surface of the light-shielding pattern layer is greater than or equal to 0.4 μm.

[0006] In at least one embodiment of the present invention, the first surface and the second surface of the light-shielding pattern layer have a roughness, and the numerical range of this roughness falls between 0.05 μm and 0.5 μm.

[0007] In at least one embodiment of the present invention, the first surface of the light-shielding pattern layer includes a plurality of parallel strip-shaped grooves, and these strip-shaped grooves extend along a long axis direction. Each of the strip-shaped grooves has a depth, and the depth range falls between 0.05 μm and 80 μm.

[0008] In at least one embodiment of the present invention, there is a distance between adjacent ones of these strip-shaped grooves, and the variation value of these distances is less than 10%.

[0009] In at least one embodiment of the present invention, a spacing exists between two adjacent strip-shaped grooves, and the range of this spacing falls between 1 μm and 30 μm.

[0010] In at least one embodiment of the present invention, the first surface of the light-shielding pattern layer presents a text or a trademark pattern.

[0011] In at least one embodiment of the present invention, each of the light-emitting elements has a top surface facing away from the driving circuit substrate, and the distance between the second surface of the light-shielding pattern layer and the driving circuit substrate is less than the distance between the top surface and the driving circuit substrate. A spacing exists between the second surface and the top surface, and this spacing is greater than 1 μm.

[0012] In at least one embodiment of the present invention, the display device further includes a plurality of pads respectively disposed on the light-emitting elements and located between the driving circuit substrate and the light-emitting elements. The light-emitting elements are electrically connected to the driving circuit substrate through the pads, and each of the pads has a top surface facing away from the driving circuit substrate. The distance between the top surface and the driving circuit substrate is less than the distance between the first surface and the driving circuit substrate.

[0013] In at least one embodiment of the present invention, the display device further includes an optical film and a bonding material. The optical film is disposed on the light-shielding pattern layer and the light-emitting elements and covers the first surface, the second surface of the light-shielding pattern layer, and the light-emitting elements. The bonding material is disposed on the light-shielding pattern layer and located between the optical film and the driving circuit substrate.

[0014] In the above embodiment, the height difference between the first surface and the second surface on the light-shielding pattern layer may cause a step difference to the vision. Therefore, when the light-emitting elements are turned off, the user can see the trademark or model pattern of the product from the display surface of the display device. Since the light-emitting elements are exposed on the first surface and the second surface of the light-shielding pattern layer, when the light-emitting elements are turned on, the light emitted by the light-emitting elements will not be blocked by the light-shielding pattern layer, so it will not affect the user's viewing of the picture. Thus, the trademark or model pattern of the product can be distributed in the display surface area of the display device, not limited by the border of the display device, thereby improving the area utilization rate of the display device. Description of the Drawings

[0015] As can be understood from the following detailed description and in conjunction with the drawings. It should be noted that various features are not drawn in the proportions of industrial practice standards. In fact, for the sake of clarity and understanding in discussion, the dimensions of various features can be arbitrarily increased or decreased.

[0016] Figure 1 A top view of a display device according to an embodiment of the present invention is shown.

[0017] Figure 2A Shown Figure 1 is a cross-sectional view of the display device along line segment A-A.

[0018] Figure 2B Shown is a partial cross-sectional view of the first surface in the display device according to another embodiment of the present invention.

[0019] Figure 3 Shown is a partial top view of the light-shielding pattern layer according to another embodiment of the present invention.

[0020] Figure 4 Shown Figure 3 is a cross-sectional view of the light-shielding pattern layer along line segment B-B.

[0021] Figures 5A to 5C Shown is a partial cross-sectional view of the method for manufacturing a display device according to an embodiment of the present invention.

[0022] Wherein, reference numerals:

[0023] 100: Display device

[0024] 110: Driving circuit board

[0025] 120: Light-emitting element

[0026] 120t, 130t: Top surface

[0027] 130: Pad

[0028] 140: Light-shielding pattern layer

[0029] 140f: First surface

[0030] 140s: Second surface

[0031] 142: Striped groove

[0032] 150: Optical film

[0033] 170: Bonding material

[0034] 545: Light-shielding material layer

[0035] 590: Mold

[0036] 590p: Opening

[0037] A-A, B-B: Line segments

[0038] A1: Longitudinal axis direction

[0039] d1, d2, d3, d4: Distances

[0040] L1: Traveling direction

[0041] p1, s1, s2: Spacing

[0042] t1: Depth

[0043] w1: Width Detailed implementation manners

[0044] The present invention will be described in detail with the following embodiments. It should be noted that the description of the embodiments of the present invention below is only for illustrative purposes and is not intended to disclose all implementation aspects exhaustively or limit the specific implementation aspects of the present invention. For example, the description of "the first feature is formed on the second feature" includes various implementation manners, which cover the direct contact between the first feature and the second feature, and also cover the formation of additional features between the first feature and the second feature so that the two do not directly contact. In addition, the same reference numerals used in the drawings and the description will be used to denote the same or similar elements as much as possible.

[0045] Spatially relative terms, such as "lower", "below", "beneath", "above", "over", etc., are used herein to simply describe the relationship of an element or feature shown in the figure to another element or feature. These spatially relative terms cover different orientations in addition to the orientation depicted in the figure when the device is in use or operation. In addition, when an element is rotatable (rotated 90 degrees or other angles), the spatially relative descriptive terms used herein can also be interpreted correspondingly.

[0046] In the following text, in order to clearly present the technical features of the present case, the dimensions (such as length, width, thickness, and depth) of the elements (such as layers, films, substrates, and regions, etc.) in the drawings are enlarged in an unequal proportion. Therefore, the description and explanation of the following embodiments are not limited to the dimensions and shapes presented by the elements in the drawings, but should cover the dimensions, shapes, and deviations between the two caused by actual processes and / or tolerances. For example, the flat surfaces shown in the drawings may have rough and / or non-linear features, and the acute angles shown in the drawings may be rounded. Therefore, the elements presented in the drawings of the present case are mainly for illustration and are not intended to accurately depict the actual shape of the elements, nor are they intended to limit the scope of the patent application of the present case.

[0047] Moreover, words such as "about", "approximate" or "substantially" appearing in the content of this case not only cover the explicitly recited numerical values and numerical ranges, but also cover the allowable deviation ranges that can be understood by those with ordinary knowledge in the technical field to which the invention pertains. Among them, this deviation range can be determined by the errors generated during measurement, and such errors are caused, for example, by the limitations of both the measurement system and the process conditions. In addition, "about" can indicate within one or more standard deviations of the above numerical values, such as within ±30%, ±20%, ±10% or ±5%. The words such as "about", "approximate" or "substantially" appearing in the text of this case can select an acceptable deviation range or standard deviation according to optical properties, etching properties, mechanical properties or other properties, rather than simply applying a single standard deviation to all properties such as the above optical properties, etching properties, mechanical properties and other properties.

[0048] Figure 1 is a top view of a display device 100 according to an embodiment of the present invention, and Figure 2A is Figure 1 a cross-sectional view of the display device 100 along line A-A. Please refer to Figure 1 and Figure 2A together. The display device 100 includes a driving circuit substrate 110, a plurality of light-emitting elements 120, and a light-shielding pattern layer 140. The light-emitting elements 120 are disposed on the driving circuit substrate 110 and are electrically connected to the driving circuit substrate 110. The driving circuit substrate 110 can be, for example, a thin film transistor (TFT) array substrate or a similar pixel array substrate. On the other hand, the light-emitting elements 120 can be, for example, organic light-emitting diodes (OLEDs), micro light-emitting diodes (Micro LEDs), or other similar light-emitting diode elements.

[0049] The light-emitting elements 120 can emit light in different wavelength ranges respectively. For example, these light-emitting elements 120 can be red light-emitting diode elements, green light-emitting diode elements, and blue light-emitting diode elements respectively. The above light-emitting diode elements of different colors are arranged in an interleaved manner. Each light-emitting diode can be regarded as a sub-pixel of the display device 100, and an adjacent red light-emitting diode element, a green light-emitting diode element, and a blue light-emitting diode element can be regarded as a pixel (i.e., a main pixel) of the display device 100. It should be particularly mentioned that the wavelength range of the light emitted by the light-emitting elements 120 in the present invention is not limited to the above (for example, at least one of the light-emitting elements 120 can also be a yellow light-emitting diode element).

[0050] The light-shielding pattern layer 140 is disposed on the driving circuit substrate 110 and exposes the light-emitting elements 120. The light-shielding pattern layer 140 has a first surface 140f facing away from the driving circuit substrate 110 and a second surface 140s, and at least two of the light-emitting elements 120 are respectively exposed on the first surface 140f and the second surface 140s. Taking Figure 2A as an example, three of the light-emitting elements 120 (i.e., the three middle light-emitting elements 120) are exposed on the first surface 140f of the light-shielding pattern layer 140, while the other two light-emitting elements 120 (i.e., the left and right light-emitting elements 120) are exposed on the second surface 140s of the light-shielding pattern layer 140. The light-shielding pattern layer 140 is an opaque encapsulation layer (e.g., black glue), and this encapsulation layer is distributed between the light-emitting elements 120 to fix the light-emitting elements 120 on the driving circuit substrate 110. In addition, the material of the light-shielding pattern layer 140 may include, for example, black encapsulation glue, black ink, or similar sealing materials.

[0051] As Figure 2A shown, the distance d1 between the first surface 140f and the driving circuit substrate 110 is less than the distance d2 between the second surface 140s and the driving circuit substrate 110. In other words, the first surface 140f of the light-shielding pattern layer 140 is recessed from the second surface 140s. In this embodiment, the spacing s1 between the first surface 140f and the second surface 140s of the light-shielding pattern layer 140 is greater than or equal to 0.4 μm, but the present invention is not limited thereto. In other embodiments, the spacing s1 between the first surface 140f and the second surface 140s may also be less than 0.4 μm. For example, the distance d1 between the first surface 140f and the driving circuit substrate 110 may fall between 2 μm and 79.6 μm, while the distance d2 between the second surface 140s and the driving circuit substrate 110 may fall between 2.4 μm and 80 μm.

[0052] It should be particularly noted that although Figure 2A the first surface 140f and the second surface 140s shown are smooth surfaces, the present invention is not limited thereto. In some embodiments, the first surface 140f and the second surface 140s of the light-shielding pattern layer 140 may substantially be rough surfaces. Figure 2B FIG. shows a partial cross-sectional view of the first surface in a display device according to another embodiment of the present invention. As Figure 2B shown, the first surface 140f and the second surface 140s of the light-shielding pattern layer 140 have roughness, and the numerical range of this roughness falls between 0.05 μm and 0.5 μm.

[0053] Figure 3 FIG. is a partial top view of the light-shielding pattern layer 140 according to another embodiment of the present invention, and Figure 4 is Figure 3Cross-sectional view of the light-shielding pattern layer 140 along line B-B. Please also refer to Figure 3 and Figure 4 , in this embodiment, the first surface 140f of the light-shielding pattern layer 140 includes a plurality of parallel strip-shaped grooves 142, and these strip-shaped grooves 142 extend along the long-axis direction A1. Each of the strip-shaped grooves 142 has a depth t1, and the range of the depth t1 falls between 0.05 μm and 80 μm. In addition, there is a pitch p1 between two adjacent strip-shaped grooves 142, and the range of this pitch p1 falls between 1 μm and 30 μm. The variation value of these pitches p1 is less than 10%.

[0054] It should be particularly mentioned that the strip-shaped grooves 142 in this embodiment can be laser cutting marks. Specifically, when the first surface 140f is formed by laser cutting and the traveling direction of the laser beam is L1, the above-mentioned strip-shaped grooves 142 will be formed on the first surface 140f. Therefore, the long-axis direction A1 of the strip-shaped grooves 142 is the same as the traveling direction L1 of the laser beam. On the other hand, the second surface 140s of the light-shielding pattern layer 140 in this embodiment has a roughness, and the value range of this roughness falls between 0.05 μm and 0.5 μm.

[0055] In various embodiments, the first surface 140f of the light-shielding pattern layer 140 can be in the form of text or a trademark pattern. For example, when the display device 100 is a product manufactured by Company A, the first surface 140f of the light-shielding pattern layer 140 in this display device 100 can present the trademark pattern or company name of Company A (for example, Figure 1 the A in

[0056] Please go back to Figure 2A , each light-emitting element 120 has a top surface 120t facing away from the driving circuit substrate 110. In this embodiment, the distance d2 between the second surface 140s of the light-shielding pattern layer 140 and the driving circuit substrate 110 is less than the distance d3 between the top surface 120t and the driving circuit substrate 110. In other words, the second surface 140s of the light-shielding pattern layer 140 is recessed from the top surface 120t of the light-emitting element 120. It should be particularly mentioned that the top surface 120t of each light-emitting element 120 is exposed to both the first surface 140f and the second surface 140s of the light-shielding pattern layer 140, so the light emitted by the light-emitting element 120 will not be blocked by the light-shielding pattern layer 140.

[0057] In this embodiment, there is a spacing s2 between the second surface 140s of the light-shielding pattern layer 140 and the top surface 120t of the light-emitting element 120, and this spacing s2 is greater than 1 μm, but the present invention is not limited thereto. In other embodiments, the spacing s2 between the second surface 140s of the light-shielding pattern layer 140 and the top surface 120t of the light-emitting element 120 may also be less than or equal to 1 μm. For example, the distance d3 between the top surface 120t and the driving circuit substrate 110 may fall between 6 μm and 80 μm.

[0058] In addition, the display device 100 of this embodiment further includes a plurality of pads 130. These pads 130 are respectively disposed on the light-emitting element 120 and are located between the driving circuit substrate 110 and the light-emitting element 120. The light-emitting element 120 is electrically connected to the driving circuit substrate 110 through these pads 130, and each pad 130 has a top surface 130t facing away from the driving circuit substrate 110. The distance d4 between the top surface 130t and the driving circuit substrate 110 is less than the distance d1 between the first surface 140f and the driving circuit substrate 110. In other words, the top surface 130t of the pad 130 is recessed from the first surface 140f of the light-shielding pattern layer 140. Since the pads 130 can be covered by the light-shielding pattern layer 140, the pads 130 can be fixed to the driving circuit substrate 110.

[0059] Please refer to Figure 2A , the display device 100 further includes an optical film 150. The optical film 150 is disposed on the light-shielding pattern layer 140 and the light-emitting element 120 and covers the first surface 140f, the second surface 140s of the light-shielding pattern layer 140, and the light-emitting element 120. The light emitted by the light-emitting element 120 can pass through the optical film 150, and the light output effect (including the light output field pattern and uniformity) can be adjusted by the optical film 150. For example, the optical film 150 may include a prism sheet or a diffusion sheet.

[0060] On the other hand, since the optical film 150 is disposed on the light-emitting element 120, in order to fix the optical film 150 above the light-emitting element 120 and prevent the light-emitting element 120 from being damaged by being squeezed by the optical film 150, the display device 100 further includes a bonding material 170. The bonding material 170 is disposed on the light-shielding pattern layer 140 and is located between the optical film 150 and the driving circuit substrate 110. The bonding material 170 covers the surface of the light-emitting element 120 to protect the light-emitting element 120. The bonding material 170 may be an encapsulant, such as an optical clear adhesive (OCA), or a similar light-transmitting material.

[0061] At least one embodiment of the present invention discloses a manufacturing method of the display device 100, which is composed ofFigures 5A to 5C is illustrated by a series of steps in. Please refer to Figure 5A , first, a driving circuit substrate 110 is provided. Next, a plurality of light-emitting elements 120 are disposed on the driving circuit substrate 110, and the light-emitting elements 120 are electrically connected to the driving circuit substrate 110. After the light-emitting elements 120 are disposed on the driving circuit substrate 110, a light-shielding material layer 545 can be formed on the driving circuit substrate 110 by, for example, lamination or spraying. The light-shielding material layer 545 covers the top surface 120t of the light-emitting elements 120.

[0062] Please refer to Figure 5B and Figure 1 , after the light-shielding material layer 545 is formed on the driving circuit substrate 110, a mold 590 is disposed on the other surface of the driving circuit substrate 110, such that the light-emitting elements 120 and the mold 590 are respectively located on opposite sides of the driving circuit substrate 110. The mold 590 has an opening 590p, and this opening 590p completely overlaps Figure 1 the first surface 140f of the light-shielding pattern layer 140 in

[0063] Next, please refer to Figure 5C , after the mold 590 is disposed on the driving circuit substrate 110, the light-shielding material layer 545 can be etched by plasma etching (for example, microwave plasma etching) to form a light-shielding pattern layer 140 as illustrated in Figure 2A . It is worth mentioning that the mold 590 can include, for example, aluminum, ceramics, or similar materials, and its thermal conductivity can fall between 0.1 and 6000 W / m·K. The heat energy in the light-shielding material layer 545 can be conducted to the outside through the mold 590. Since one block of the light-shielding material layer 545 overlaps on the mold 590, while the other block overlaps on the opening 590p, the heat dissipation efficiencies of the two blocks are different.

[0064] Specifically, the heat dissipation efficiency of the light-shielding material layer 545 overlapping on the mold 590 can be greater than the heat dissipation efficiency of the light-shielding material layer 545 overlapping on the opening 590p. In this way, it will cause the temperature of the light-shielding material layer 545 overlapping on the mold 590 to be lower than the temperature of the light-shielding material layer 545 overlapping on the opening 590p.

[0065] In the process of plasma etching, different temperature environments will affect the etching rate, thereby resulting in different etching depths. Since the heat dissipation efficiencies of the two blocks in the light-shielding material layer 545 are different (and thus the temperatures of the two blocks are also different), the depths of the light-shielding material layer 545 etched are also different. Specifically, in this embodiment, the temperature of the light-shielding material layer 545 overlapping the mold 590 is lower, while the temperature of the light-shielding material layer 545 overlapping the opening 590p is higher.

[0066] Therefore, the depth of the light-shielding material layer 545 etched overlapping the mold 590 will be less than the depth of the light-shielding material layer 545 etched overlapping the opening 590p. In other words, the aforementioned light-shielding pattern layer 140 can be formed, and the distance d1 between the first surface 140f of the light-shielding pattern layer 140 and the driving circuit substrate 110 is less than the distance d2 between the second surface 140s of the light-shielding pattern layer 140 and the driving circuit substrate 110. However, the method of etching the light-shielding material layer 545 is not limited to the above embodiment. In other embodiments, the light-shielding material layer 545 can also be etched by, for example, laser cutting.

[0067] It should be particularly mentioned that, in this embodiment, the opening 590p of the mold 590 has a width w1, and the range of this width w1 can be 0.4 mm or more, and the size of the width w1 depends on the thermal conductivity of the material of the mold 590. For example, when the material of the mold 590 contains aluminum and the thermal conductivity is 237 W / m·K, in order to make the distance s1 between the first surface 140f and the second surface 140s of the light-shielding pattern layer 140 greater than or equal to 0.4 μm, the width w1 is at least 10 mm.

[0068] After forming the light-shielding pattern layer 140, the mold 590 is removed. Then, a bonding material 170 (shown in Figure 2A ) can be provided on the light-shielding pattern layer 140 and the light-emitting element 120 by means of lamination, spraying, or rolling, and an optical film 150 (shown in Figure 2A ) is bonded to the bonding material 170. So far, the display device 100 shown in Figure 2A has been roughly completed.

[0069] In summary, due to the height difference between the first surface and the second surface of the light-shielding pattern layer, a step difference is created visually. Therefore, when the light-emitting element is turned off, the trademark or model pattern of the product can be seen from the display surface of the display device. Since the light-emitting element is exposed on the first surface and the second surface of the light-shielding pattern layer, when the light-emitting element is turned on, the light emitted by the light-emitting element will not be blocked by the light-shielding pattern layer, so it will not affect the user's view of the screen. In this way, the trademark or model pattern of the product can be distributed in the display surface area of the display device, not limited by the border of the display device, thereby improving the area utilization rate of the display device.

[0070] Although the embodiments of the present invention have been disclosed above, they are not intended to limit the embodiments of the present invention. Any person with ordinary knowledge in the technical field to which the present invention pertains, without departing from the spirit and scope of the embodiments of the present invention, may make some modifications and refinements. Therefore, the protection scope of the embodiments of the present invention shall be determined by the scope of the appended patent application.

Claims

1. A display device, characterized in that, Comprising: A driving circuit substrate; A plurality of light-emitting elements, disposed on the driving circuit substrate and electrically connected to the driving circuit substrate; And A light-shielding pattern layer, disposed on the driving circuit substrate and exposing the light-emitting elements, wherein the light-shielding pattern layer has a first surface and a second surface facing away from the driving circuit substrate, and at least two of the light-emitting elements are respectively exposed on the first surface or the second surface, wherein the distance between the first surface and the driving circuit substrate is less than the distance between the second surface and the driving circuit substrate.

2. The display device according to claim 1, wherein Wherein a spacing between the first surface and the second surface of the light-shielding pattern layer is greater than or equal to 0.4 μm.

3. The display device according to claim 1, characterized in that, Wherein the first surface and the second surface of the light-shielding pattern layer have a roughness, and the numerical range of the roughness falls between 0.05 μm and 0.5 μm.

4. The display device according to claim 1, wherein Wherein the first surface of the light-shielding pattern layer includes: A plurality of juxtaposed strip-shaped grooves, and the strip-shaped grooves extend along a long-axis direction, wherein each of the strip-shaped grooves has a depth, and the depth range falls between 0.05 μm and 80 μm.

5. The display device according to claim 4, characterized in that, Wherein there is a spacing between adjacent ones of the strip-shaped grooves, and the variation value of the spacings is less than 10%.

6. The display device according to claim 4, wherein Wherein there is a spacing between adjacent ones of the strip-shaped grooves, and the spacing range falls between 1 μm and 30 μm.

7. The display device according to claim 1, characterized in that, Wherein the first surface of the light-shielding pattern layer is in the shape of words or a trademark pattern.

8. The display device according to claim 1, wherein Wherein each of the light-emitting elements has a top surface facing away from the driving circuit substrate, and the distance between the second surface of the light-shielding pattern layer and the driving circuit substrate is less than the distance between the top surface and the driving circuit substrate, wherein there is a spacing between the second surface and the top surface, and the spacing is greater than 1 μm.

9. The display device according to claim 1, wherein Further comprising: A plurality of pads, respectively disposed on the light-emitting elements and located between the driving circuit substrate and the light-emitting elements, wherein the light-emitting elements are electrically connected to the driving circuit substrate through the pads, and each of the pads has a top surface facing away from the driving circuit substrate, wherein the distance between the top surface and the driving circuit substrate is less than the distance between the first surface and the driving circuit substrate.

10. The display device according to claim 1, characterized in that, Further comprising: An optical film, disposed on the light-shielding pattern layer and the light-emitting elements and covering the first surface, the second surface of the light-shielding pattern layer and the light-emitting elements; And An adhesive material, disposed on the light-shielding pattern layer and located between the optical film and the driving circuit substrate.

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