US-20260124913-A1 - CAPACITIVE SENSING INPUT DEVICE

Abstract

A capacitive sensing input device includes: a resin layer that is light transmissive and includes a front surface that is a design surface; a capacitive sensor sheet that overlaps a back surface of the resin layer; and a light source (light-emitting element) that emits light to the resin layer and the capacitive sensor sheet. The resin layer includes non-uniform light transmittance, and the capacitive sensor sheet includes a non-uniform aperture ratio for light transmission to inhibit luminance non-uniformity of light that has passed through the resin layer.

Inventors

• Shinji Kanda
• SHO SONODA
• Kento WAKIDA

Assignees

• PANASONIC AUTOMOTIVE SYSTEMS CO., LTD.

Dates

Publication Date

20260507

Application Date

20250929

Priority Date

20241107

Claims (5)

1. 1 . A capacitive sensing input device comprising: a resin layer that is light transmissive and includes a front surface that is a design surface; a capacitive sensor sheet that overlaps a back surface of the resin layer; and a light source that emits light to the resin layer and the capacitive sensor sheet, wherein the resin layer includes non-uniform light transmittance, and the capacitive sensor sheet includes a non-uniform aperture ratio for light transmission to inhibit luminance non-uniformity of light that has passed through the resin layer.
2. 2 . The capacitive sensing input device according to claim 1 , wherein an aperture ratio of a portion of the capacitive sensor sheet is lower as a light transmittance of a portion of the resin layer corresponding to the portion of the capacitive sensor sheet is higher.
3. 3 . The capacitive sensing input device according to claim 1 , wherein the capacitive sensor sheet includes a light-transmissive sheet that transmits light, a light-blocking portion that blocks light, and one or more electrodes disposed on the light-transmissive sheet and spaced apart from the light-blocking portion, the light-blocking portion includes a dot pattern arranged on the light-transmissive sheet, and the light-blocking portion is so disposed that an aperture ratio of a portion of the capacitive sensor sheet is lower as a light transmittance of a portion of the resin layer corresponding to the portion of the capacitive sensor sheet is higher.
4. 4 . The capacitive sensing input device according to claim 1 , wherein the capacitive sensor sheet includes a light-transmissive sheet that transmits light and a light-blocking portion that blocks light, the light-blocking portion includes a mesh pattern arranged on the light-transmissive sheet, and the light-blocking portion is so disposed that an aperture ratio of a portion of the capacitive sensor sheet is lower as a light transmittance of a portion of the resin layer corresponding to the portion of the capacitive sensor sheet is higher.
5. 5 . The capacitive sensing input device according to claim 1 , wherein the resin layer varies in thickness, and an aperture ratio of a portion of the capacitive sensor sheet is lower as a thickness of a portion of the resin layer corresponding to the portion of the capacitive sensor sheet is smaller.

Description

CROSS REFERENCE TO RELATED APPLICATION The present application is based on and claims priority of Japanese Patent Application No. 2024-195131 filed on Nov. 7, 2024. FIELD The present disclosure relates to a capacitive sensing input device. BACKGROUND As related art, an electrode sheet for a capacitive touch panel has been known. For example, Patent Literature (PTL) 1 discloses an electrode sheet for a capacitive touch panel that includes: a transparent substrate; a first conductive portion formed on one principal surface of the substrate; and a second conductive portion formed on an other principal surface of the substrate. CITATION LIST Patent Literature PTL 1: Japanese U.S. Pat. No. 5,795,038 SUMMARY However, the electrode sheet for the capacitive touch panel according to PTL 1 can be improved upon. In view of this, the present disclosure provides a capacitive sensing input device capable of improving upon the above related art. A capacitive sensing input device according to one aspect of the present disclosure includes: a resin layer that is light transmissive and includes a front surface that is a design surface; a capacitive sensor sheet that overlaps a back surface of the resin layer; and a light source that emits light to the resin layer and the capacitive sensor sheet. The resin layer includes non-uniform light transmittance, and the capacitive sensor sheet includes a non-uniform aperture ratio for light transmission to inhibit luminance non-uniformity of light that has passed through the resin layer. The capacitive sensing input device according to the present disclosure is capable of improving upon the above related art. BRIEF DESCRIPTION OF DRAWINGS These and other advantages and features of the present disclosure will become apparent from the following description thereof taken in conjunction with the accompanying drawings that illustrate a specific embodiment of the present disclosure. FIG. 1 is a schematic diagram illustrating a capacitive sensing input device provided in a vehicle. FIG. 2 is a block diagram illustrating the capacitive sensing input device. FIG. 3 is a cross-sectional view illustrating the capacitive sensing input device. FIG. 4 is a diagram illustrating luminance non-uniformity of light that has passed through a resin layer and exited a design surface. FIG. 5 is a diagram illustrating a dot pattern of a light-blocking portion of a capacitive sensor sheet. FIG. 6 is a diagram illustrating a mesh pattern of the light-blocking portion of the capacitive sensor sheet. DESCRIPTION OF EMBODIMENT The following specifically describes one or more embodiments with reference to the drawings. Note that each of the one or more embodiments described below shows a general or specific example. The numerical values, shapes, materials, structural elements, the arrangement and connection of the structural elements, etc. shown in the following one or more embodiments are mere examples, and are not intended to limit the scope of the present disclosure. In addition, among the structural elements in the following one or more embodiments, structural elements not recited in any one of the independent claims are described as optional structural elements. Moreover, the figures are schematic diagrams and are not necessarily precise illustrations. Moreover, configurations that are essentially the same share like reference signs in the figures. Moreover, in the following one or more embodiments, expressions such as being substantially parallel and a rectangular shape are used. For example, being substantially parallel and the rectangular shape respectively mean not only being completely parallel and a completely rectangular shape but also mean being substantially parallel and a substantially rectangular shape, or stated differently, also mean that an error of about a few percent or several percent may be included. Moreover, being substantially parallel and a rectangular shape respectively mean being parallel and a rectangular shape in a scope in which effects yielded by the present disclosure can be achieved. The same also applies to other similar expressions that include or indicate “substantially” or “shape”. Embodiment Configuration First, a configuration of capacitive sensing input device 10 will be described with reference to FIG. 1 to FIG. 6. FIG. 1 is a schematic diagram illustrating capacitive sensing input device 10 provided in vehicle 1. FIG. 2 is a block diagram illustrating capacitive sensing input device 10. FIG. 3 is a cross-sectional view illustrating capacitive sensing input device 10. FIG. 4 is a diagram illustrating luminance non-uniformity of light that has passed through resin layer 31 and exited design surface 31a. FIG. 5 is a diagram illustrating a dot pattern of light-blocking portion 22b of capacitive sensor sheet 22. FIG. 6 is a diagram illustrating a mesh pattern of light-blocking portion 22b of capacitive sensor sheet 22. As illustrated in FIG. 1, capacitive sensing input device