Display panel

Abstract

A display panel that displays a predetermined design shape on a display screen when a light source emits light, said display panel comprising: a decorative sheet having layered therein, in this order, a translucent printed layer provided to a partial area of a transparent substrate, a light-shielding printed layer having an opening forming a predetermined design shape, and an adhesive layer; and a transparent adherend to which the decorative sheet is affixed by the adhesive layer. Part of the outer edge section of the translucent printed layer reaches the outer edge section of the substrate in a planar view.

Description

[Technical Field]

[0001] The present invention relates to a display panel. [Background technology]

[0002] The following Patent Document 1 discloses a technology relating to an adhesive sheet having an adhesive layer, in which a flow path for discharging air bubbles is provided in the adhesive layer, so that air bubbles that get in when the adhesive sheet is attached to an adherend can be discharged to the outside. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-061586 Summary of the Invention [Problem to be solved by the invention]

[0004] However, providing a bubble discharge channel in the adhesive layer may reduce the translucency of the adhesive, which may result in a reduction in the brightness of the design displayed on the display surface of the display panel when such an adhesive layer is applied to a display panel to allow light to pass through. [Means for solving the problem]

[0005] A display panel according to one embodiment is a display panel that displays a predetermined design shape on a display surface when a light source emits light, and comprises a decorative sheet in which a translucent printing layer is provided in a partial area of ​​a transparent substrate, a light-blocking printing layer having an opening forming the predetermined design shape, and an adhesive layer are laminated in this order, and a transparent substrate to which the decorative sheet is attached by the adhesive layer, and in a planar view, a portion of the outer edge of the translucent printing layer reaches the outer edge of the substrate. [Effects of the Invention]

[0006] According to one embodiment of the display panel, air bubbles that enter when the decorative sheet is attached to the substrate can be easily expelled to the outside without reducing the brightness of the design shape displayed on the display surface of the display panel. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a cross-sectional view schematically illustrating a stacked structure of a display device according to an embodiment. [Figure 2] FIG. 1 is a plan view showing a first example of the shape of a light-transmitting print layer included in a display panel according to an embodiment; [Figure 3] FIG. 10 is a plan view showing a second example of the shape of a light-transmitting print layer included in a display panel according to an embodiment; [Figure 4] FIG. 10 is a plan view showing a third example of the shape of a light-transmitting print layer included in a display panel according to an embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment will be described below with reference to the drawings. Note that the drawings are partially exaggerated for ease of understanding, and the relative dimensional relationships are not accurately depicted.

[0009] (Configuration of display device 10) FIG. 1 is a cross-sectional view schematically showing the layered structure of a display panel 100 according to an embodiment.

[0010] In the following description, for convenience, the X-axis direction will be referred to as the left-right direction, the Y-axis direction as the front-rear direction, and the Z-axis direction as the up-down direction. However, the positive X-axis direction will be referred to as the rightward direction, the positive Y-axis direction as the forward direction, and the positive Z-axis direction as the upward direction. These directions indicate relative positional relationships within the device and do not limit the installation direction or operation direction of the device. Any devices that have the same relative positional relationships within the device, even if they have different installation directions or operation directions, are all within the scope of the present invention.

[0011] 1, the display panel 100 includes a decorative sheet 110, a transparent panel 120, a substrate 130, and LEDs (Light Emitting Diodes) 131 (an example of a "light source"). When the LEDs 131 emit light, the display panel 100 can display a predetermined design shape (for example, characters, symbols, figures, etc.) on a display surface 100A.

[0012] The decorative sheet 110 is a sheet-like member having a multilayer structure. The decorative sheet 110 decorates the display panel 100 by being attached to the back surface 120A of the transparent panel 120. The decorative sheet 110 includes, in order from the back surface side (the lower side in the figure), a base material 111, a light-transmitting printed layer 112, a light-blocking printed layer 113, and an adhesive layer 114.

[0013] The base material 111 has the same outer shape as the decorative sheet 110 and is a flexible, transparent, sheet-like member that serves as the base of the decorative sheet 110. That is, the decorative sheet 110 is formed by sequentially laminating other layers (a light-transmitting printed layer 112, a light-blocking printed layer 113, and an adhesive layer 114) on the upper surface of the base material 111. For example, the base material 111 is formed using a flexible, transparent, sheet-like base material (e.g., PMMA (Poly Methyl Methacrylate), PC (Polycarbonate), urethane, ABS, glass, etc.).

[0014] The light-transmitting printed layer 112 is formed larger than the predetermined design shape displayed on the display surface 100A in an area of ​​the surface of the base material 111 that overlaps the predetermined design shape (i.e., the area that overlaps the opening 113A of the light-blocking printed layer 113, described later) so that the overlapping area is guaranteed regardless of variations in position or size. The light-transmitting printed layer 112 is light-transmitting and imparts a specific effect to light that passes through the light-transmitting printed layer 112. For example, the light-transmitting printed layer 112 is formed using a light-transmitting white ink. This allows the light-transmitting printed layer 112 to display the predetermined design shape displayed on the display surface 100A in white, preventing the internal structure of the display panel 100 from being visible from the outside through the opening 113A of the light-blocking printed layer 113. Furthermore, the light-transmitting printed layer 112 can emit light uniformly in the color emitted by the LED 131 when the LED 131 is illuminated. In this embodiment, a white printed layer formed by silk screen printing is used as an example of the light-transmitting printed layer 112.

[0015] The light-blocking printed layer 113 is formed with the same outer shape as the substrate 111 and is formed over the surface of the light-transmitting printed layer 112. The light-blocking printed layer 113 has light-blocking properties and has openings 113A that form a predetermined design shape to be displayed on the display surface 100A of the display panel 100. The light-blocking printed layer 113 is formed on the entire surface of the substrate 111 except for the openings 113A so that the internal structure of the display panel 100 cannot be seen from the outside in areas other than the openings 113A. The light-blocking printed layer 113 partially transmits light that is emitted from the LEDs 131 and transmitted through the substrate 111 and the light-transmitting printed layer 112 through the openings 113A, thereby displaying an optical image of the predetermined design shape on the display surface 100A of the display panel 100. For example, the light-blocking printed layer 113 is formed by printing a black ink having light-blocking properties in a predetermined design shape on the surface of the base material 111 on which the light-transmitting printed layer 112 has been formed. Therefore, the light-blocking printed layer 113 is formed such that the portion that does not overlap with the light-transmitting printed layer 112 is in contact with the surface of the base material 111, and the portion that overlaps with the light-transmitting printed layer 112 is formed in contact with the surface of the light-transmitting printed layer 112. In this embodiment, a black printed layer formed by silkscreen printing is used as an example of the light-blocking printed layer 113.

[0016] The adhesive layer 114 has adhesiveness and light-transmitting properties, and is formed over the entire area of ​​the base material 111 in the same external shape as the external shapes of the base material 111 and the light-blocking printed layer 113, and is formed over the entire surface of the light-blocking printed layer 113. In this embodiment, a light-transmitting double-sided tape is used as an example of the adhesive layer 114.

[0017] The transparent panel 120 is a flat, transparent resin member. The transparent panel 120 is an example of an "adhered object," and the decorative sheet 110 is attached to the back surface 120A of the transparent panel 120 by the adhesive layer 114 of the decorative sheet 110.

[0018] The substrate 130 is a flat plate-shaped member made of resin. The substrate 130 is provided below the decorative sheet 110 and spaced apart from the decorative sheet 110. For example, a PWB (Printed Wired Board) or the like can be used as the substrate 130.

[0019] The LED 131 is mounted on the upper surface of the substrate 130 (i.e., the back side of the base material 111) in a position that overlaps with a predetermined design shape displayed on the display surface 100A of the display panel 100. The LED 131 emits light at a predetermined timing, and irradiates light of a predetermined color from the back side of the decorative sheet 110 toward the opening 113A of the light-blocking printed layer 113. The light emission timing of the LED 131 is controlled externally.

[0020] The display panel 100 configured as described above can display a predetermined design shape on the display surface 100A by transmitting light emitted from the LED 131 through the base material 111, the light-transmitting printing layer 112, the opening 113A in the light-blocking printing layer 113, the adhesive layer 114, and the transparent panel 120.

[0021] 1, the decorative sheet 110 has a thick portion 110A that is a region that is relatively thicker than the outer region, and is formed by overlapping the light-blocking printed layer 113 and the adhesive layer 114 with sides 112a and 112b (one example of the "outer edge portion of the light-transmitting printed layer") that are part of the outer edge of the light-transmitting printed layer 112. This thick portion 110A is formed along the sides 112a and 112b of the light-transmitting printed layer 112 in a plan view (see FIG. 2, which will be described later). Therefore, in the decorative sheet 110, a step portion 114A is formed in the adhesive layer 114 between the thick portion 110A and the region outside the thick portion 110A. As a result, when the decorative sheet 110 is attached to the rear surface 120A of the transparent panel 120 of the display panel 100, there is a risk that air bubbles 20 may be trapped between the transparent panel 120 and the decorative sheet 110 (the surface of the area outside the thick portion 110A) and in the space near the step portion 114A, as shown in FIG. 1.

[0022] Note that Figure 1 is a schematic diagram, and therefore shows parallel gaps extending to the left and right (X-axis direction) of the air bubble 20; however, when actually pasting, the decorative sheet 110 bends outside the step portion 114A and comes into contact with and adheres to the transparent panel 120, so there are no gaps (spaces) in the outer regions away from the space showing the air bubble 20 to the left and right (X-axis direction), and the adhesive layer 114 and the transparent panel 120 are in contact in the region excluding the space showing the air bubble 20.

[0023] (First Example of Shape of Light-Transmitting Printing Layer 112) 2 is a plan view of a decorative sheet 110 showing a first example of the shape of a light-transmitting printed layer 112 included in a display panel 100 according to an embodiment. Note that although the base material 111 and the adhesive layer 114 are not shown in FIG. 2, their outer shapes are the same rectangular shape as the light-blocking printed layer 113.

[0024] As shown in FIG. 2, the decorative sheet 110 according to the first embodiment has a rectangular shape with its longitudinal direction extending in the left-right direction (X-axis direction) when viewed from below (negative Z-axis direction) in a plan view.

[0025] 2, the light-transmitting printed layer 112 is formed in the center of the decorative sheet 110 in a plan view from below (negative Z-axis direction) and at a position overlapping with an opening 113A (for example, the letters "ALAP") formed in the light-blocking printed layer 113. The light-transmitting printed layer 112 has a rectangular shape that encompasses the entire opening 113A in a plan view from below (negative Z-axis direction). The light-transmitting printed layer 112 is formed in a partial region of the base material 111 and the light-blocking printed layer 113, and overlaps the entire opening 113A.

[0026] 2, the width of the light-transmitting printed layer 112 in the left-right direction (X-axis direction) is shorter than the widths of the base material 111 and the light-blocking printed layer 113 in the left-right direction (X-axis direction). On the other hand, the width of the light-transmitting printed layer 112 in the front-rear direction (Y-axis direction) is equal to the widths of the base material 111 and the light-blocking printed layer 113 in the front-rear direction (Y-axis direction).

[0027] Therefore, in the decorative sheet 110 of the first embodiment, the right side (positive side of the X-axis) side 112a and the left side (negative side of the X-axis) side 112b of the outer edge of the translucent printing layer 112 reach the front side (positive side of the Y-axis) side 110a and the rear side (negative side of the Y-axis) side 110b of the outer edge of the decorative sheet 110 (an example of the "outer edge of the base material").

[0028] Accordingly, in the decorative sheet 110 of the first embodiment, the thick portion 110A and the step portion 114A formed along the right side (positive side of the X-axis) 112a of the translucent printing layer 112 and the thick portion 110A and the step portion 114A formed along the left side (negative side of the X-axis) 112b of the translucent printing layer 112 each reach the front side (positive side of the Y-axis) 110a and the rear side (negative side of the Y-axis) 110b of the outer edge portion of the decorative sheet 110 (outer edge portion of the base material 111), respectively.

[0029] As a result, in the display panel 100 of the first embodiment, even if air gets mixed in between the transparent panel 120 and the decorative sheet 110 (in the step portion 114A near the thick portion 110A) when the decorative sheet 110 is attached to the back surface 120A of the transparent panel 120 and a bubble 20 is generated, the bubble 20 can be expelled from the front (positive Y-axis direction) side 110a or the rear (negative Y-axis direction) side 110b of the decorative sheet 110 by pushing the bubble 20 forward (positive Y-axis direction) or rear (negative Y-axis direction) from the center in the front-to-back direction (Y-axis direction) within the step portion 114A along the right (positive X-axis side) side 112a or the left (negative X-axis side) side 112b of the translucent printing layer 112.

[0030] Therefore, in the display panel 100 of the first embodiment, when the decorative sheet 110 is attached to the rear surface 120A of the transparent panel 120, the air bubbles 20 generated between the transparent panel 120 and the decorative sheet 110 can be easily expelled by sequentially applying pressure using, for example, silicone or the like having a pressing surface that is inclined from the center toward the outside in the front-to-back direction (Y-axis direction).

[0031] (Second Example of Shape of Light-Transmitting Printing Layer 112) 3 is a plan view of a decorative sheet 110 showing a second example of the shape of the light-transmitting printed layer 112 included in a display panel 100 according to an embodiment. Note that the base material 111 and adhesive layer 114 are not shown in FIG. 3, but their outer shapes are the same rectangular shape as the light-blocking printed layer 113. In the following, the same or similar components as those in the first example are given the same names and symbols, and descriptions thereof may be omitted.

[0032] As shown in Fig. 3, the decorative sheet 110 according to the second embodiment has a rectangular shape with its longitudinal direction extending in the left-right direction (X-axis direction) in a plan view from below (negative Z-axis direction). In the example shown in Fig. 3, the light-transmitting printed layer 112 has a rectangular main portion 112A that entirely encompasses the opening 113A, located at the center of the decorative sheet 110 and at a position overlapping with the opening 113A formed in the light-blocking printed layer 113 in a plan view from below (positive Z-axis direction). The main portion 112A is formed in a partial region of the substrate 111 and the light-blocking printed layer 113, and overlaps with the entire opening 113A.

[0033] 3, the width in the left-right direction (X-axis direction) of the main portion 112A of the light-transmitting printed layer 112 is shorter than the width in the left-right direction (X-axis direction) of the decorative sheet 110. In addition, the width in the front-rear direction (Y-axis direction) of the main portion 112A of the light-transmitting printed layer 112 is shorter than the width in the front-rear direction (Y-axis direction) of the decorative sheet 110.

[0034] 3, the light-transmitting printed layer 112 has a first connection portion 112B that extends linearly from the center of the front side (positive side of the Y axis) of the main portion 112A toward the front (positive direction of the Y axis) in a plan view from below (negative direction of the Z axis). The first connection portion 112B extends linearly with a constant width (narrower than that of the main portion 112A) from the center of the front side (positive side of the Y axis) of the main portion 112A toward the front (positive direction of the Y axis). The first connection portion 112B reaches the front side (positive side of the Y axis) of the outer edge of the decorative sheet 110. Therefore, in the display panel 100 according to the second embodiment, the thick portion 110A and the step portion 114A formed along the first connection portion 112B reach the front side (positive side of the Y axis) of the outer edge of the decorative sheet 110.

[0035] 3, the light-transmitting printed layer 112 has a second connection portion 112C that extends linearly from the center of the rear side (negative Y-axis side) of the main portion 112A toward the rear (negative Y-axis direction) in a plan view from below (negative Z-axis direction). The second connection portion 112C extends linearly with a constant width (narrower than that of the main portion 112A) from the center of the rear side (negative Y-axis side) of the main portion 112A toward the rear (negative Y-axis direction). The second connection portion 112C reaches the rear side (negative Y-axis side) of the outer edge of the decorative sheet 110. Therefore, in the display panel 100 according to the second embodiment, the thick portion 110A and the stepped portion 114A formed along the second connection portion 112C reach the rear side (negative Y-axis side) of the outer edge of the decorative sheet 110.

[0036] As a result, in the display panel 100 of the second embodiment, even if air gets mixed in between the transparent panel 120 and the decorative sheet 110 (at the step portion 114A near the thick portion 110A) when the decorative sheet 110 is attached to the back surface 120A of the transparent panel 120 and a bubble 20 is generated, the bubble 20 can be pushed forward (positive direction of the Y-axis) or backward (negative direction of the Y-axis) within the step portion 114A along the first connection portion 112B or the second connection portion 112C of the translucent printing layer 112, thereby discharging the bubble 20 from the front side (positive side of the Y-axis) edge 110a or the rear side (negative side of the Y-axis) edge 110b of the decorative sheet 110.

[0037] Therefore, in the display panel 100 of the second embodiment, when the decorative sheet 110 is attached to the rear surface 120A of the transparent panel 120, the air bubbles 20 generated between the transparent panel 120 and the decorative sheet 110 can be easily expelled by sequentially applying pressure using, for example, silicone or the like having a pressing surface that is inclined from the center toward the outside in the front-to-back direction (Y-axis direction).

[0038] (Third Example of Shape of Light-Transmitting Printing Layer 112) 4 is a plan view of the decorative sheet 110 showing a third example of the shape of the light-transmitting printed layer 112 included in the display panel 100 according to one embodiment. In the first and second examples, the light-transmitting printed layer 112 is arranged to overlap with the openings 113A formed in the light-blocking printed layer 113, and light transmitted through the light-transmitting printed layer 112 displays a predetermined design shape on the display surface 100A. In the third example, a case will be described in which the light-transmitting printed layer 112 is used to align the decorative sheet 110 with the transparent panel 120.

[0039] Although not shown in Figure 4, the decorative sheet 110 of the third embodiment has the configuration of the decorative sheet 110 shown in the first or second embodiment (i.e., the configuration for displaying a predetermined design shape on the display surface 100A) continuous in the X direction.

[0040] 4, the base material 111 and the adhesive layer 114 are omitted from the illustration, but similar to the first and second examples, the base material 111 has the same outer shape as the outer shape of the decorative sheet 110, the adhesive layer 114 is formed over the entire area of ​​the base material 111, and the light-blocking printed layer 113 is formed over the entire surface of the base material 111 except for the openings 113A. In the following, the same names and symbols are used for components that are the same as or similar to those in the first and second examples, and descriptions thereof may be omitted.

[0041] As shown in FIG. 4, the decorative sheet 110 according to the third embodiment has a rectangular shape with its longitudinal direction extending in the left-right direction (X-axis direction) when viewed from below (negative Z-axis direction).

[0042] 4, the light-transmitting printed layer 112 is provided at a position that does not overlap with the openings 113A formed in the light-blocking printed layer 113 (i.e., a position that does not overlap with a predetermined design shape) in a plan view from below (negative Z-axis direction). Therefore, the light-transmitting printed layer 112 shown in FIG. 4 cannot be seen from the front side of the decorative sheet 110, and can only be seen from the back side of the decorative sheet 110.

[0043] 4, the light-transmitting printed layer 112 has a first linear portion 112D and a second linear portion 112E. In a plan view from above, the first linear portion 112D is provided at the center of the decorative sheet 110 and extends linearly in the left-right direction (X-axis direction). In a plan view from above, the second linear portion 112E is provided at the center of the decorative sheet 110 and extends linearly in the front-back direction (Y-axis direction). In a plan view from below, the first linear portion 112D and the second linear portion 112E have a cross shape that intersects at right angles at their midpoints. The first linear portion 112D and the second linear portion 112E function as "marker portions" having alignment shapes (in this example, cross shapes) for aligning the decorative sheet 110 with respect to the transparent panel 120.

[0044] 4, the light-transmitting print layer 112 has a first connection portion 112F that extends forward (in the positive Y-axis direction) from the front (positive Y-axis) end of the second straight portion 112E in a plan view from below (negative Z-axis direction). The first connection portion 112F reaches the front (positive Y-axis) side 110a of the outer edge of the decorative sheet 110. Therefore, in the decorative sheet 110 according to the third embodiment, the thick portion 110A and the step portion 114A formed along the first connection portion 112F reach the front (positive Y-axis) side 110a of the outer edge of the decorative sheet 110.

[0045] 4, the light-transmitting print layer 112 has a second connection portion 112G that extends rearward (in the negative Y-axis direction) from the rear (negative Y-axis) end of the second straight portion 112E in a plan view from below (in the negative Z-axis direction). The second connection portion 112G reaches the rear (negative Y-axis side) side 110b of the outer edge of the decorative sheet 110. Therefore, in the decorative sheet 110 according to the third embodiment, the thick portion 110A and the stepped portion 114A formed along the second connection portion 112G reach the rear (negative Y-axis side) side 110b of the outer edge of the decorative sheet 110.

[0046] As a result, in the display panel 100 of the third embodiment, even if air gets mixed in between the transparent panel 120 and the decorative sheet 110 (in the step portion 114A near the thick portion 110A) when the decorative sheet 110 is attached to the back surface 120A of the transparent panel 120 and a bubble 20 is generated, the bubble 20 can be pushed forward (positive direction of the Y-axis) or backward (negative direction of the Y-axis) within the step portion 114A along the first connection portion 112F or the second connection portion 112G of the translucent printing layer 112, thereby discharging the bubble 20 from the front side (positive side of the Y-axis) edge 110a or the rear side (negative side of the Y-axis) edge 110b of the decorative sheet 110.

[0047] Therefore, in the display panel 100 of the third embodiment, when the decorative sheet 110 is attached to the rear surface 120A of the transparent panel 120, the air bubbles 20 generated between the transparent panel 120 and the decorative sheet 110 can be easily expelled by sequentially applying pressure using, for example, silicone or the like having a pressing surface that is inclined from the center toward the outside in the front-to-back direction (Y-axis direction).

[0048] In particular, in the example shown in FIG. 4, the first connecting portion 112F and the second connecting portion 112G of the light-transmitting print layer 112 have a tapered shape in which the left-right width (width in the X-axis direction) gradually increases toward the outer edge of the decorative sheet 110.

[0049] As a result, the display panel 100 of the third embodiment maintains a thin line width like the second straight line portion 112E as a function of the marker portion, while gradually widening the line width in the portion that does not function as a marker portion, thereby preventing the left and right step portions from connecting if the line width remains thin, making it difficult for the air bubble 20 to escape.

[0050] In the first to third embodiments, the decorative sheet 110 has a rectangular shape in plan view with the front-to-back direction (Y-axis direction) as the short side direction and the left-to-right direction (X-axis direction) as the long side direction, and the light-transmitting printed layer 112 is extended in the short side direction (Y-axis direction) so that the light-transmitting printed layer 112 reaches the outer edge. The display panels 100 according to the first to third embodiments can make the light-transmitting printed layer 112 reach the nearest outer edge, thereby reducing the amount of ink used for the light-transmitting printed layer 112.

[0051] (Actions and Effects of the Display Panel 100) As described above, the display panel 100 of one embodiment is a display panel 100 that displays a predetermined design shape on the display surface 100A when the LED 131 emits light, and is equipped with a decorative sheet 110 in which a light-transmitting printed layer 112 is provided in a partial area of ​​a transparent base material 111, a light-blocking printed layer 113 having an opening 113A forming a predetermined design shape, and an adhesive layer 114 are laminated in this order, and a transparent panel 120 to which the decorative sheet 110 is attached by the adhesive layer 114, and in a planar view, a portion of the outer edge of the light-transmitting printed layer 112 reaches the outer edge of the base material 111.

[0052] As a result, the display panel 100 according to one embodiment can discharge air bubbles 20 that have entered between the adhesive layer 114 and the transparent panel 120 when the decorative sheet 110 is attached to the outside along the outer edge of the light-transmitting printed layer 112, without using any equipment for dealing with air bubbles, such as vacuum equipment. Furthermore, the display panel 100 according to one embodiment does not require the adhesive layer 114 to have a flow path for discharging air bubbles, and therefore the light transmittance of the adhesive layer 114 does not decrease.

[0053] Therefore, according to the display panel 100 of one embodiment, the air bubbles 20 that have entered when the decorative sheet 110 is attached to the transparent panel 120 can be easily expelled to the outside without reducing the brightness of the design shape displayed on the display surface 100A.

[0054] Furthermore, in the display panel 100 of one embodiment, the translucent printing layer 112 is provided in a portion of the base material 111, and therefore the amount of ink used for the translucent printing layer 112 can be reduced compared to when the translucent printing layer 112 is provided over the entire base material 111.

[0055] Furthermore, in a planar view, the display panel 100 of one embodiment has a thick portion 110A in the adhesive layer 114 formed by overlapping the light-shielding printing layer 113 and the adhesive layer 114 on the outer edge of the light-transmitting printing layer 112 along the outer edge of the light-transmitting printing layer 112, and a step portion 114A formed between the thick portion 110A and the area outside the thick portion 110A, and the step portion 114A reaches the outer edge of the substrate 111 along the outer edge of the light-transmitting printing layer 112.

[0056] As a result, the display panel 100 of one embodiment is able to expel air bubbles 20 that have entered between the adhesive layer 114 and the transparent panel 120 when the decorative sheet 110 is attached to the outside through the step portion 114A of the adhesive layer 114 formed along the outer edge of the translucent printing layer 112.

[0057] Furthermore, the display panel 100 of one embodiment includes an LED 131 arranged on the back side of the base material 111, and the light-transmitting printing layer 112 is provided in a region of the base material 111 that overlaps with a predetermined design shape, and light emitted from the LED 131 passes through the base material 111, the light-transmitting printing layer 112, the opening 113A of the light-blocking printing layer 113, the adhesive layer 114, and the transparent panel 120, thereby displaying the predetermined design shape on the display surface 100A.

[0058] As a result, the display panel 100 according to the embodiment can display a predetermined design shape formed by the openings 113A of the light-blocking print layer 113 on the display surface 100A.

[0059] In addition, in the display panel 100 according to one embodiment, the light-transmitting printed layer 112 has a main portion 112A arranged at a position overlapping a predetermined design shape, and connection portions 112B and 112C that connect the main portion 112A to the outer edge of the substrate 111.

[0060] As a result, the display panel 100 according to the embodiment can easily expel, via the step portions 114A of the connecting portions 112B and 112C, any air bubbles 20 that have entered the step portions 114A of the main portion 112A when attaching the decorative sheet 110. Furthermore, as a result, the display panel 100 according to the embodiment can minimize the size of the main portion 112A, thereby reducing the amount of ink used in the light-transmitting print layer 112.

[0061] In addition, in one embodiment of the display panel 100, the translucent printing layer 112 is provided in a portion of the base material 111 that does not overlap with a predetermined design shape, and has a marker portion having a predetermined positioning shape and connection portions 112F, 112G that connect the marker portion to the outer edge of the base material 111.

[0062] As a result, the display panel 100 according to the embodiment can easily expel the air bubbles 20 that have entered the step portion 114A of the marker portion when the decorative sheet 110 is attached, to the outside through the edge portions of the connecting portions 112F, 112G.

[0063] Furthermore, in the display panel 100 according to one embodiment, the connecting portions 112F and 112G have a shape that gradually widens from the marker portion toward the outer edge of the base material 111 in a plan view.

[0064] This makes it possible for the display panel 100 according to the embodiment to prevent the left and right step portions of the marker portion with a narrow line width from joining together, making it difficult to discharge the air bubble 20.

[0065] In the display panel 100 according to the embodiment, the adhesive layer 114 is a light-transmitting double-sided tape.

[0066] As a result, the display panel 100 according to the embodiment does not need to use a special double-sided tape with low light transmittance for preventing air bubbles, and therefore can use a cheap double-sided tape with higher light transmittance.

[0067] In the display panel 100 according to the embodiment, the light-transmitting print layer 112 is a white print layer formed by silkscreen printing.

[0068] As a result, the display panel 100 according to one embodiment can have a thicker translucent printed layer 112 than other printing methods such as offset printing, thereby making the step portion 114A larger and thus making it easier to expel the air bubbles 20.

[0069] In the display panel 100 according to the embodiment, the light-blocking printed layer 113 is a black printed layer formed by silkscreen printing.

[0070] As a result, the display panel 100 according to one embodiment can have a thicker light-blocking printed layer 113 than other printing methods such as offset printing, thereby making the step portion 114A larger and thus making it easier to expel air bubbles 20.

[0071] Although one embodiment of the present invention has been described in detail above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

[0072] This international application claims priority to Japanese Patent Application No. 2022-101374, filed on June 23, 2022, the entire contents of which are incorporated herein by reference. [Explanation of symbols]

[0073] 20 bubbles 100 Display Panel 100A display surface 110 Decorative Sheet 110a, 110b: Sides of the outer edge of the decorative sheet (outer edge of the base material) 110A thick part 111 Base material 112 Translucent printing layer 112A Main Section 112B First connection part 112C Second connection part 112D 1st straight section 112E 2nd straight section 112F 1st connection 112G 2nd connection 112a, 112b Sides of the outer edge of the light-transmitting printing layer (outer edge of the light-transmitting printing layer) 113 Light-shielding printed layer 113A opening 114 Adhesive layer 114A Step 120 Transparent panel (adherend) 120A back side 130 PCB 131 LED (light source)

Claims

1. A display panel that displays a predetermined design shape on a display surface when a light source emits light, a decorative sheet in which a transparent substrate is provided with a light-transmitting printed layer in a partial region, a light-shielding printed layer having openings in the predetermined design shape, and an adhesive layer are laminated in this order; a transparent adherend to which the decorative sheet is attached by the adhesive layer; Equipped with In a plan view, a part of the outer edge of the light-transmitting printing layer reaches the outer edge of the base material. A display panel characterized by:

2. a thick portion formed by overlapping the light-blocking printing layer and the adhesive layer along the outer edge of the light-transmitting printing layer in the plan view; a step portion formed in the adhesive layer between the thick portion and an area outside the thick portion; Equipped with The step portion extends along the outer edge of the light-transmitting print layer and reaches the outer edge of the base material.

2. The display panel according to claim 1, wherein the first and second electrodes are arranged parallel to each other.

3. a light source disposed on the back side of the substrate; The light-transmitting printing layer is The base material is provided in a partial area overlapping the predetermined design shape, The predetermined design shape is displayed on the display surface by transmitting light emitted from the light source through the base material, the light-transmitting printed layer, the openings in the light-blocking printed layer, the adhesive layer, and the adherend.

2. The display panel according to claim 1, wherein the first and second electrodes are arranged parallel to each other.

4. The light-transmitting printing layer is a main portion provided at a position overlapping the predetermined design shape; a connecting portion that connects the main portion and the outer edge portion of the base material; 4. The display panel according to claim 3.

5. The light-transmitting printing layer is The design element is provided in a partial area of ​​the base material that does not overlap with the predetermined design shape, a marker portion having a predetermined positioning shape; a connecting portion that connects the marker portion and the outer edge portion of the base material; 2. The display panel according to claim 1, wherein the first and second electrodes are arranged parallel to each other.

6. The connection portion is In a plan view, the width of the marker portion gradually increases from the marker portion toward the outer edge of the base material.

6. The display panel according to claim 5.

7. The adhesive layer is a light-transmitting double-sided tape.

7. The display panel according to claim 1, wherein the first and second electrodes are electrically connected to each other.

8. The light-transmitting printed layer is a white printed layer formed by silk screen printing.

7. The display panel according to claim 1, wherein the first and second electrodes are electrically connected to each other.

9. The light-blocking printed layer is a black printed layer formed by silk screen printing.

7. The display panel according to claim 1, wherein the first and second electrodes are electrically connected to each other.

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