Display device

Abstract

A display device (101) comprises: a display panel (1) having a base material (5) and a self-luminous element structure (6) positioned above the base material (5); a plurality of sensor wires (7) for detecting a touch position, the plurality of sensor wires (7) being positioned above the display panel (1); and a silicon oxide layer (3) positioned above the plurality of sensor wires (7).

Description

display device

[0001] The present disclosure relates to a display device.

[0002] Patent Document 1 discloses an OLED panel. The OLED panel disclosed in Patent Document 1 includes an OLED element and a sealing portion covering the OLED element and including a translucent conductive film, provided above a substrate. In the OLED panel disclosed in Patent Document 1, a touch sensor portion is formed above the sealing portion without an adhesive layer. OLED is an abbreviation for Organic Light Emitting Diode.

[0003] International Publication No. WO2018 / 138811

[0004] For example, in a display device having a touch panel formed on the upper side of a flexible display panel, it is desirable to realize a display device that is highly resistant to impacts from the backside of the display device. The backside of the display device means the side opposite the self-luminous elements of the display panel with respect to the base material of the display panel.

[0005] A display device according to one embodiment of the present disclosure includes a substrate, a display panel having a self-luminous element structure located above the substrate, a plurality of sensor wirings located above the display panel for detecting a touch position, and a silicon oxide layer located above the plurality of sensor wirings.

[0006] According to one aspect of the present disclosure, a display device having high strength against impacts from the back side of the display device can be realized.

[0007] FIG. 1 is a cross-sectional view showing the configuration of a display device according to embodiment 1 of the present disclosure. FIG. 2 is a cross-sectional view showing the configuration of a display panel. FIG. 3 is a cross-sectional view showing the configuration of a touch panel according to embodiment 1 of the present disclosure. FIG. 4 is a diagram showing the outline of a durability test. FIG. 5 is a table showing the configuration of a display device according to a comparative example. FIG. 6 is a table showing the results of a durability test on a display device according to a comparative example. FIG. 7 is a table showing the configuration of a display device according to embodiment 1 of the present disclosure. FIG. 8 is a table showing the results of a durability test on a display device according to embodiment 1 of the present disclosure. FIG. 9 is a cross-sectional view showing the configuration of a display device according to embodiment 2 of the present disclosure. FIG. 10 is a cross-sectional view showing the configuration of a touch panel according to embodiment 2 of the present disclosure. FIG. 11 is a table showing the configuration of a display device according to embodiment 2 of the present disclosure.

[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes an embodiment of the present disclosure. For convenience of explanation, the same reference numerals are used to designate components having the same functions as those previously described, and the description thereof may not be repeated.

[0009] [Embodiment 1] Fig. 1 is a cross-sectional view showing the configuration of a display device 101 according to embodiment 1 of the present disclosure. Fig. 2 is a cross-sectional view showing the configuration of a display panel 1. Fig. 3 is a cross-sectional view showing the configuration of a touch panel 2 according to embodiment 1 of the present disclosure.

[0010] The display device 101 includes a display panel 1, a touch panel 2, a silicon oxide layer 3, and a polarizing plate 4. The silicon oxide layer 3 and the polarizing plate 4 are bonded together by an adhesive 51. An example of the adhesive 51 is OCA. OCA is an abbreviation for Optical Clear Adhesive.

[0011] The display panel 1 has a base material 5 and a self-emitting element structure 6 located above the base material 5. The self-emitting element structure 6 has a plurality of self-emitting elements. The self-emitting element structure 6 may have various circuits related to driving the self-emitting elements, such as pixel circuits, partitions that partition pixels defined for each self-emitting element, and insulating films that insulate at least two specific locations from each other. Examples of the self-emitting element include an OLED element and a QLED element. QLED is an abbreviation for Quantum Light Emitting Diode. An adhesive 52 is located between the base material 5 and the self-emitting element structure 6. An example of the adhesive 52 is OCA.

[0012] The display device 101 includes a plurality of sensor wirings 7 located above the display panel 1 for detecting a touch position.

[0013] The silicon oxide layer 3 is located above the plurality of sensor wirings 7. The silicon oxide layer 3 is made of, for example, SiO Ｘ and a specific example thereof is SiO ２ The silicon oxide layer 3 may generate a compressive force against an impact from the opposite side of the substrate 5 from the light-emitting element structure 6 .

[0014] According to display device 101, when an impact is applied to the back side of the display device, the tensile force generated in the layer of touch panel 2, particularly made of silicon nitride, can be offset by the compressive force generated in silicon oxide layer 3. Display device 101 can reduce the risk of display device 101 warping due to an impact from the back side of the display device, thereby realizing a display device with high strength against an impact from the back side of the display device.

[0015] The plurality of sensor wirings 7 may include first sensor wirings 8 and second sensor wirings 9 located above the first sensor wirings 8. The display device 101 may also include a base coat layer 10 located below the first sensor wirings 8 and made of silicon nitride (e.g., SiN), and an insulating layer 11 located between the first sensor wirings 8 and the second sensor wirings 9 and made of silicon oxide.

[0016] When the thickness of the base coat layer 10 is TB, the thickness of the insulating layer 11 is TN, and the thickness of the silicon oxide layer 3 is TC, TN+TC may be 6 times or more and 8 times or less than TB.

[0017] If the thicknesses are the same, the tensile strength of the silicon nitride layer is about six times the compressive strength of the silicon oxide layer. Therefore, by making TN+TC six times or more the TB, the tensile strength caused by the base coat layer 10 can be sufficiently offset, thereby realizing a display device 101 that is highly resistant to impacts from the back side of the display device.

[0018] If TN+TC is less than six times TB, the display device 101 may not have sufficient strength to withstand an impact from the backside of the display device. If TN+TC is more than eight times TB, the thickness of the silicon oxide layer 3 may become too large, making it difficult to form the silicon oxide layer 3 by vapor deposition. The thickness of the silicon oxide layer 3 that can be formed by vapor deposition is approximately 0.5 μm or less.

[0019] The display device 101 may include a touch panel 2 having a plurality of sensor wirings 7, and the silicon oxide layer 3 may be located above the touch panel 2. The display device 101 may also include a polarizing plate 4 located above the silicon oxide layer 3.

[0020] The display panel 1 may be flexible. The material of the base material 5 may be polyimide. In the display device 101 in which the touch panel 2 is formed on the upper side of the flexible display panel 1, it is possible to realize a display device with high strength against impacts from the back side of the display device.

[0021] The touch panel 2 has a plurality of sensor wires 7 (first sensor wires 8 and second sensor wires 9), a base coat layer 10, an insulating layer 11, and an overcoat layer 12. The overcoat layer 12 is located above the second sensor wires 9. An example of the material of the overcoat layer 12 is a resin.

[0022] The first sensor wirings 8 are arranged in stripes along one of the vertical and horizontal directions. The second sensor wirings 9 are arranged in stripes along the other of the vertical and horizontal directions. The touch panel 2 may detect a touch position based on a detection result of a change in capacitance of the first sensor wirings 8 and the second sensor wirings 9 that overlap with a finger touching the panel.

[0023] A durability test was performed on each of the display device according to the comparative example and the display device 101 according to the first embodiment of the present disclosure.

[0024] Fig. 4 is a diagram showing the outline of a durability test. Fig. 5 is a table showing the configuration of a display device according to a comparative example. Fig. 6 is a table showing the results of a durability test on a display device according to a comparative example. Fig. 7 is a table showing the configuration of a display device 101 according to embodiment 1 of the present disclosure. Fig. 8 is a table showing the results of a durability test on a display device 101 according to embodiment 1 of the present disclosure.

[0025] In the display device according to the comparative example, the material of the insulating layer 11 is SiO ２ The display device 101 according to the first embodiment of the present disclosure differs from the display device 101 according to the first embodiment of the present disclosure in that the display device 101 is made of SiN (silicon nitride) instead of silicon oxide (silicon oxide) and does not include the silicon oxide layer 3. Except for these points, the configuration of the display device according to the comparative example and the configuration of the display device 101 according to the first embodiment of the present disclosure are the same.

[0026] As shown in Figure 4, the durability test was conducted by pressing the back side of the display device with a cylindrical SUS rod 53 having a diameter of 10 mm. SUS is an abbreviation for Steel Use Stainless. Figures 5 and 7 each show the main materials, thicknesses, and type of force generated in the components used in the display device 101. The type of force generated indicates whether the force generated is a tensile force or a compressive force. A "-" in the type of force generated column indicates that the force generated (tensile force or compressive force) can be considered to be zero.

[0027] Samples 1 to 5 shown in Fig. 6 are samples of display devices according to comparative examples. Samples 6 to 10 shown in Fig. 8 are samples of the display device 101 according to the first embodiment of the present disclosure. In the durability test, each of the five display device samples was pressed with a SUS rod 53. The back pressure in each of Figs. 6 and 8 is the force with which the SUS rod 53 presses the back side of the display device. The numerical value of the back pressure is a minimum of 0.2 kg / cm ２ and a maximum of 20 kg / cm ２ The values ​​were set as shown in Figures 6 and 8. The results of the durability test are indicated as NG or OK. NG indicates that dark spots were found in the display image of the display device. OK indicates that no dark spots were found. Dark spots are black dots in the display image that are formed due to malfunction of the self-luminous elements of the display panel 1.

[0028] Comparing FIG. 6 and FIG. 8, it can be seen that the display device 101 according to the first embodiment of the present disclosure has higher strength against impacts from the back side of the display device than the display device according to the comparative example.

[0029] In the past, tensile force was generated in the touch panel, which could cause the display device to warp. Display device 101 can be interpreted as having a silicon oxide layer 3, insulating layer 11 made of silicon oxide, and a display device that has improved warping by adjusting the total thickness of silicon oxide layer 3 and insulating layer 11.

[0030] A compressive force is generated by the silicon oxide layer 3 and the insulating layer 11, and the total thickness of the silicon oxide layer 3 and the insulating layer 11 may be set to 0.6 μm or more and 0.8 μm or less, which is approximately 6 times or more and approximately 8 times or less than the base coat layer 10 (thickness 0.1 μm) that generates the tensile force.

[0031] [Embodiment 2] Fig. 9 is a cross-sectional view showing the configuration of a display device 101 according to embodiment 2 of the present disclosure. Fig. 10 is a cross-sectional view showing the configuration of a touch panel 2 according to embodiment 2 of the present disclosure. Fig. 11 is a table showing the configuration of the display device 101 according to embodiment 2 of the present disclosure.

[0032] The display device 101 includes a touch panel 2 having a plurality of sensor wirings 7, and the silicon oxide layer 3 may be included in the touch panel 2. The display device 101 according to the second embodiment of the present disclosure may not include the overcoat layer 12. The silicon oxide layer 3 of the display device 101 according to the second embodiment of the present disclosure can be interpreted as functioning as a substitute for the overcoat layer 12 of the display device 101 according to the first embodiment of the present disclosure.

[0033] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

[0034] REFERENCE SIGNS LIST 1 display panel 2 touch panel 3 silicon oxide layer 4 polarizer 5 substrate 6 self-luminous element structure 7 sensor wiring 8 first sensor wiring 9 second sensor wiring 10 base coat layer 11 insulating layer 12 overcoat layer 101 display device

Claims

1. A display device comprising: a substrate; a display panel having a self-luminous element structure located above the substrate; a plurality of sensor wirings located above the display panel for detecting a touch position; and a silicon oxide layer located above the plurality of sensor wirings.

2. The display device according to claim 1, wherein the plurality of sensor wirings include first sensor wirings and second sensor wirings located in a layer above the first sensor wirings, and the display device comprises: a base coat layer located in a layer below the first sensor wirings and made of silicon nitride; and an insulating layer located between the first sensor wirings and the second sensor wirings and made of silicon oxide, wherein when the thickness of the base coat layer is TB, the thickness of the insulating layer is TN, and the thickness of the silicon oxide layer is TC, TN+TC is 6 times or more and 8 times or less than TB.

3. The display device according to claim 1 or 2, wherein the display device comprises a touch panel having the plurality of sensor wirings, and the silicon oxide layer is located above the touch panel.

4. The display device according to claim 1 or 2, wherein the display device comprises a touch panel having the plurality of sensor wirings, and the silicon oxide layer is included in the touch panel.

5. The display device according to any one of claims 1 to 4, further comprising a polarizing plate located above the silicon oxide layer.

6. The display device according to any one of claims 1 to 5, wherein the display panel is flexible.

7. The display device according to any one of claims 1 to 6, wherein the material of the substrate is polyimide.

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