US-12625589-B2 - Sensor including a plurality of substrates

Abstract

A sensor includes a first substrate on a back side of a display panel, a first coil extending in a first direction at a predetermined angle between 0 and 90 degrees with respect to a long-side direction of the first substrate and including a first long-side portion provided with first and second end portions, a second coil including a second long-side portion extending in a second direction, a first leader line including a first end and a second end, wherein the first end is connected to the first end portion, and the second end is connected to wiring on a second substrate arranged to extend at a right angle toward the outside of the sensor from one side of the first substrate, and a second leader line including first end connected to the end portion and a second end connected to the wiring on the second substrate.

Inventors

• Yuanhao Chen
• Yoshihisa Sugiyama
• Akira Ito

Assignees

• WACOM CO., LTD.

Dates

Publication Date

20260512

Application Date

20250114

Claims (18)

1. 1 . A sensor comprising: a first substrate which, in operation, is arranged on a back side of a display panel; a first coil extending in a first direction at a predetermined angle larger than 0 degrees and smaller than 90 degrees with respect to a long-side direction of the first substrate, the first coil including a first long-side portion provided with a first end portion and second end portion; a second coil including a second long-side portion extending in a second direction crossing the first direction; a first leader line including a first end and a second end, wherein the first end is connected to the first end portion of the first coil, and the second end is connected to wiring on a second substrate arranged to extend at a right angle toward an outside of the sensor from one side of the first substrate; and a second leader line including a first end connected to the second end portion of the first coil and a second end connected to the wiring on the second substrate.
2. 2 . The sensor according to claim 1 , wherein: a terminal group arranged side by side in the long-side direction of the first substrate is formed on the second substrate, and the second end of the first leader line and the second end of the second leader line are connected to the wiring on the second substrate through the terminal group.
3. 3 . The sensor according to claim 2 , wherein: the terminal group is provided on a detection region of the sensor while the sensor is viewed in plan view.
4. 4 . The sensor according to claim 3 , wherein: the first and second leader lines include bent portions extending in directions different from the first and second directions.
5. 5 . The sensor according to claim 3 , wherein: at least some of a plurality of terminals included in the terminal group include bent portions extending in directions different from the long-side direction of the first substrate and a short-side direction of the first substrate.
6. 6 . The sensor according to claim 1 , wherein: the first substrate is a multilayer substrate including a plurality of layers including a first layer, a second layer, and a third layer, the first long-side portion is provided in the second layer, the second long-side portion is provided in the third layer, and the first and second leader lines are provided in the first layer.
7. 7 . The sensor according to claim 6 , wherein: the first layer is an outermost layer of the plurality of layers, and at least one of the second and third layers is an inner layer of the plurality of layers.
8. 8 . The sensor according to claim 1 , wherein: the first and second coils are formed such that at least part of a short-side portion of the first coil and at least part of a short-side portion of the second coil overlap while the sensor is viewed in plan view.
9. 9 . The sensor according to claim 8 , wherein: the first substrate is a multilayer substrate including a plurality of layers including a first layer, a second layer, and a third layer, the first long-side portion is provided in the second layer, the second long-side portion is provided in the third layer, the first and second leader lines are provided in the first layer, a plurality of first coils and a plurality of second coils are formed on the first substrate, each of the plurality of first coils includes a first overlapping portion overlapping an adjacent one of the first coils while the sensor is viewed in plan view, each of the plurality of second coils includes a second overlapping portion overlapping an adjacent one of the second coils while the sensor is viewed in plan view, and the first overlapping portion of each of the plurality of first coils or the second overlapping portion of each of the plurality of second coils is provided in the first layer.
10. 10 . The sensor according to claim 8 , wherein: the first and second coils are formed such that an acute angle portion of the first coil and an obtuse angle portion of the second coil overlap while the sensor is viewed in plan view.
11. 11 . The sensor according to claim 10 , further comprising: an integrated circuit connected to the wiring on the second substrate, wherein the integrated circuit, in operation, supplies a current at a same time to the acute angle portion and the obtuse angle portion.
12. 12 . The sensor according to claim 1 , wherein: the first and second coils include adjustment portions which, in operation, reduce a difference in magnetic flux density at corner portions of the first substrate.
13. 13 . The sensor according to claim 1 , wherein: a plurality of the first coils is formed on the first substrate, and a number of turns of a relatively short first coil among the plurality of first coils is larger than a number of turns of a relatively long first coil among the plurality of first coils.
14. 14 . The sensor according to claim 1 , further comprising: an integrated circuit connected to the wiring on the second substrate, wherein: a plurality of first coils with different lengths is formed on the first substrate, and the integrated circuit, in operation, adjusts, for each of the plurality of first coils, at least one of a voltage and a current to be supplied to each of the plurality of first coils.
15. 15 . The sensor according to claim 2 , wherein: each of the first and second leader lines is provided on a detection region of the sensor while the sensor is viewed in plan view.
16. 16 . The sensor according to claim 15 , wherein: each of the first and second leader lines includes: a first section extending in the second direction, wherein a first end of the first section is connected to a corresponding one of the first and second end portions of the first coil, a second section extending in the first direction, wherein a first end of the second section is connected to a second end of the first section, and a third section extending in the second direction, wherein a first end of the third section is connected to a second end of the second section, the first substrate is a multilayer substrate including a plurality of layers including a first layer and a second layer, the first coil and the second section are provided in the first layer, and the second coil and the first and third sections are provided in the second layer.
17. 17 . The sensor according to claim 16 , wherein: the first coil is positioned on one of four corners of the first substrate.
18. 18 . The sensor according to claim 17 , wherein: the first coil is formed in a substantially triangular shape.

Description

TECHNICAL FIELD The present disclosure relates to a sensor, and particularly, to a sensor stacked in a display apparatus and used. BACKGROUND ART There is a known position detection apparatus in which a sensor detects an alternating magnetic field transmitted from a position indicator to detect the position of the position indicator. Examples of known specific systems of this type of position detection apparatus include an electromagnetic (EM) system in which a battery needs to be provided on the position indicator and an electromagnetic resonance (EMR) (registered trademark) system of using an electromagnetic wave transmitted by the position detection apparatus through the sensor to generate power in the position indicator. While the electromagnetic wave is transmitted only from the position indicator to the position detection apparatus in the EM system, the electromagnetic wave is transferred in both directions in the EMR (registered trademark) system. The sensor of the position detection apparatus includes a set of a plurality of first coils (loop electrodes) elongated and extended in a first direction and second coils (loop electrodes) elongated and extended in a second direction crossing the first direction. Although the first and second directions are usually a long-side direction and a short-side direction of a rectangle detection region, respectively, Patent Document 1 discloses a technique of diagonally forming the coils with respect to the long-side direction of the detection region. In addition, the position detection apparatus requires a controller. A leader line for connecting the controller and each coil is conventionally arranged outside of the detection region as also described in Patent Document 1, and the controller is connected to the corresponding coil on an edge portion of the detection region. Therefore, an invalid area in which the position of the position indicator cannot be detected is formed outside of the detection region. However, the trend of narrowing the bezel of the display apparatus in recent years often does not permit to provide a wide invalid area, and reduction of the invalid area is demanded. With regard to the problem, Patent Document 2 discloses a technique, in which the connection point of the leader line and each coil is provided on a center portion of the detection region instead of the edge portion, and the leader lines are arranged between the coils. According to the technique, the invalid area provided outside of the detection region can be minimized. PRIOR ART DOCUMENT Patent Documents Patent Document 1: Japanese Patent No. 4648860Patent Document 2: Japanese Patent No. 4405247 SUMMARY Technical Problems Incidentally, the position detection apparatus and the display apparatus are placed on top of each other in a tablet terminal, and the display apparatus usually includes a gate line extended in the long-side direction of the detection region. Therefore, when the gate line of the display apparatus is driven by a predetermined signal, the coils extending in the long-side direction of the detection region are affected by the signal throughout the entire length. As a result, the magnetic flux generated by the coils affects the operation of the display apparatus, and the user may perceive this as moire patterns. According to the technique of Patent Document 1, all of the coils of the position detection apparatus are not parallel to the gate line of the display apparatus, and this can reduce the influence on the operation of the display apparatus caused by the magnetic flux generated by the coils. Therefore, the inventor of the present application is examining to provide the connection point of the leader line and each coil on the center portion of the detection region instead of the edge portion as in Patent Document 2 in the configuration of Patent Document 1 in which each coil is formed diagonally with respect to the long-side direction of the detection region in order to reduce the influence on the operation of the display apparatus caused by the magnetic flux generated by the coils of the position detection apparatus and in order to minimize the invalid area provided outside of the detection region. However, it has been discovered that if the configuration is adopted, the visibility of the display apparatus is reduced, and the arrangement efficiency of various circuits provided in the tablet terminal is reduced. Hereinafter, the problems will be described in detail. The tablet terminal generally includes a display module and a circuit unit arranged on the back surface of the display module (surface on the opposite side of the display surface). A display panel of the display apparatus and a sensor provided with the coils of the position detection apparatus are arranged in the display module. Various circuits, such as a processor of the tablet terminal, a controller of the position detection apparatus, and a control circuit of the display apparatus, are arranged in