Display device

Provided herein is a display device including a display unit for displaying an image, the display unit including light emitting regions; a touch sensor arranged on a rear surface of the display unit; and a coil unit arranged on a front surface of the display unit, and including a plurality of auxiliary coils.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean Patent Application No. 10-2014-0145304, filed on Oct. 24, 2014, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference in their entirety.

BACKGROUND

Field

Various embodiments of the present disclosure relate to a display device that includes a touch sensor.

Description of Related Art

A touch sensor is a sensor that is configured to sense a touch motion of a user. Since it can substitute for additional input devices such as a keyboard and mouse etc., it is being widely used in mobile devices, and its usage is expanding.

Such a touch sensor may be attached to a display panel that displays an image and may perform a function of sensing touches.

There are various types of touch sensors: capacitive touch sensors, inductive touch sensors, and resistive touch sensors.

Inductive touch sensors are used to sense touches performed by a stylus with precision.

SUMMARY

According to an embodiment, there is provided a display device including a display unit for displaying an image, the display unit including light emitting regions; a touch sensor arranged on a rear surface of the display unit; and a coil unit arranged on a front surface of the display unit, and including a plurality of auxiliary coils.

The plurality of auxiliary coils may be in a floating state.

The plurality of auxiliary coils may be spiral inductors.

Each of the plurality of auxiliary coils may be a parallelogram helical coil.

The parallelogram helical coil may include a pad connected to one end of the parallelogram helical coil.

The other end of the parallelogram helical coil maybe connected to the pad.

The parallelogram helical coil may form a closed loop.

The plurality of auxiliary coils may be circular helical coils.

The circular helical coil may include a pad connected to one end of the circular helical coil.

The other end of the circular helical coil may be connected to the pad.

The circular helical coil may form a closed loop.

The touch sensor may be an inductive touch sensor.

The display unit may include a plurality of pixels.

The plurality of auxiliary coils may not overlap with the light emitting regions.

Each of the plurality of auxiliary coils may have a helical structure.

The coil unit may further include a plurality of pads each connected to the auxiliary coils.

Each of the plurality of auxiliary coils may form a closed loop.

The touch sensor may include a plurality of driving coils, and a plurality of sensing coils disposed such that they intersect the driving coils.

The touch sensor may further include a driver configured to supply a driving current to the driving coils, and a controller configured to receive a signal being output from the sensing coils.

At least a portion of the auxiliary coils may be disposed between the light emitting regions.

The pixels may be disposed between the auxiliary coils.

DETAILED DESCRIPTION

Hereinafter, embodiments will be described in greater detail with reference to the accompanying drawings. Embodiments are described herein with reference to cross-sectional illustrations that are schematic illustrations of embodiments (and intermediate structures). As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments should not be construed as limited to the particular shapes of regions illustrated herein but may include deviations in shapes that result, for example, from manufacturing. In the drawings, lengths and sizes of layers and regions may be exaggerated for clarity. Like reference numerals in the drawings denote like elements.

Terms such as ‘first’ and ‘second’ may be used to describe various components, but they should not limit the various components. Those terms are only used for the purpose of differentiating a component from other components. For example, a first component may be referred to as a second component, and a second component may be referred to as a first component and so forth without departing from the spirit and scope of the present disclosure. Furthermore, ‘and/or’ may include any one of or a combination of the components mentioned.

Furthermore, a singular form may include a plural from as long as it is not specifically mentioned in a sentence. Furthermore, “include/comprise” or “including/comprising” used in the specification represents that one or more components, steps, operations, and elements exist or are added.

Furthermore, unless defined otherwise, all the terms used in this specification including technical and scientific terms have the same meanings as would be generally understood by those skilled in the related art. The terms defined in generally used dictionaries should be construed as having the same meanings as would be construed in the context of the related art, and unless clearly defined otherwise in this specification, should not be construed as having idealistic or overly formal meanings.

It is also noted that in this specification, “connected/coupled” refers to one component not only directly coupling another component but also indirectly coupling another component through an intermediate component. On the other hand, “directly connected/directly coupled” refers to one component directly coupling another component without an intermediate component.

FIG. 1is a view illustrating a display device according to an embodiment of the present disclosure, andFIG. 2is a view illustrating a display unit according to an embodiment of the present disclosure.

Especially,FIG. 1illustrates a layered structure of a display unit100, touch sensor200and coil unit300included in a display device1.

Referring toFIG. 1, the display device1according to an embodiment of the present disclosure may include a display unit100, touch sensor200, and coil unit300.

The display unit100may perform a function of displaying an image, and for this purpose, may include a plurality of light emitting regions of pixels120.

Herein, the light emitting regions of pixels120may emit light in certain colors. For example, each of the light emitting regions of pixels120may emit light primary colors such as red, green, blue etc.

The number of the light emitting regions of pixels120may vary depending on a size or resolution and so forth of the display unit100.

Furthermore, the display unit100may further include driving circuits (not illustrated) for controlling the light emitting regions of pixels120.

The touch sensor200may be arranged on a rear surface of the display unit100. By forming the touch sensor200on the rear surface of the display unit100, the display device may have increased luminance as compared to the display device having the touch sensor on the front surface of the display unit100.

For example, the display unit100and the touch sensor200may be attached to each other through an additional adhesive layer.

Herein, the touch sensor200may sense a touch event that occurs in the display device1.

For example, a user may generate a touch event on an upper side of the coil unit300using a stylus or finger and so forth.

Herein, the touch sensor200may detect a location of the generated touch event.

FIG. 3is a view illustrating a touch sensor according to an embodiment of the present disclosure.

The touch sensor200according to the embodiment of the present disclosure may be an inductive touch sensor.

For example, the touch sensor200according to the embodiment of the present disclosure may include a plurality of driving coils210and a plurality of sensing coils220.

The driving coils210and sensing coils220may be disposed such that they intersect each other.

For example, each of the driving coils210may extend along a first direction (for example, X axis direction).

Furthermore, the driving coils210may be arranged along a second direction (for example, Y axis direction) that intersects the first direction.

Herein, each of the driving coils210may have a shape of a loop.

For example, as illustrated inFIG. 3, each of the driving coils210may have a shape of a multiple loop.

Furthermore, each of the driving coils210may have a shape of a single loop.

For example, each of the sensing coils220may extend along the second direction.

Furthermore, the sensing coils220may be arranged along the first direction intersecting the second direction.

Herein, each of the sensing coils220may have a shape of a loop.

For example, as illustrated inFIG. 3, each of the sensing coils220may have a shape of a multiple loop.

Furthermore, each of the sensing coils220may have a shape of a single loop.

The number of the driving coils210and the sensing coils220may vary depend on the sensing accuracy needed.

The touch sensor200according to the embodiment of the present disclosure may further include a driver240and controller250.

The driver240may supply a driving current (Idrv) to the driving coils210.

For example, the driver240may sequentially supply the driving current (Idrv) having a predetermined current value to the driving coils210.

The driving current (Idrv) may flow along a path formed by the driving coil210. Accordingly, a certain magnetic field may be formed around the driving coil210.

The controller250may receive a signal being output from the sensing coils220, and may detect a touch event using the received signal.

When a touch event occurs by the stylus, a change of magnetic field occurs in the sensing coil220to which the stylus is approached or touched, and accordingly, a current flowing in the corresponding sensing coil220changes as well.

Therefore, the controller250may detect a location of the touch event using the current signal being detected in the sensing coils220.

Furthermore, the controller250may perform a function of controlling an operation of the driver240together with a function of detecting a touch event.

The touch sensor200may include a coil unit300on the front surface of the display unit100to ensure a detection of a touch event that causes no change or extremely little change in the magnetic field (for example, a touch event by a finger). Without the coil unit300, the touch sensor may not detect a touch event by a finger.

Accordingly, the display device1according to the embodiment of the present disclosure may be configured to detect all various kinds of touch events by having the coil unit300.

FIG. 4is a view illustrating a coil unit300according to an embodiment of the present disclosure.

Referring toFIG. 1, the coil unit300according to the embodiment of the present disclosure may be arranged on a front surface of the display unit100.

For example, the display unit100and the coil unit300may be attached to each other through an additional adhesive layer.

Accordingly, when the display unit100displays an image on the front surface, the user may see the image through the coil unit300.

Referring toFIG. 4, the coil unit300according to an embodiment of the present disclosure may include a plurality of auxiliary coils310.

The plurality of auxiliary coils310may be arranged such that they are spaced apart from one another, and each of the auxiliary coils310may be in a floating state.

The plurality of auxiliary coils310may be spiral inductors. The spiral inductors may be parallelogram helical coils. Furthermore, each of the auxiliary coils310may have a circular structure, spiral structure or helical structure.

Furthermore, when the user touches the front surface of the coil unit300using a finger, a capacitance is generated between the user's finger and an auxiliary coil310adjacent to the finger, and a magnetic field between the auxiliary coil310and the sensing coils220changes as well.

Accordingly, the controller250may recognize a location of the touch using a signal being output from the sensing coils220.

FIG. 5is a view illustrating an arrangement between auxiliary coils and pixels according to an embodiment of the present disclosure.

That is,FIG. 5illustrates overlapped view of the coil unit300and the display unit100.

When the display unit100outputs an image on a front surface side, there is concern that the aperture ratio of the display device1may be deteriorated by the coil unit300disposed on the front surface of the display unit100.

Therefore, as illustrated inFIG. 5, the auxiliary coils310included in the coil unit300may be disposed such that they do not overlap light emitting regions of the pixels120included in the display unit100.

For this purpose, at least a portion of the auxiliary coils310may be disposed between the light emitting regions of pixels120.

Furthermore, the light emitting regions of pixels120may be disposed between the auxiliary coils310.

FIGS. 6ato 6dare views illustrating auxiliary coils according to another embodiment of the present disclosure.

First, referring toFIG. 6a, the coil unit300according to an embodiment of the present disclosure may further include a plurality of pads330.

Herein, each of the auxiliary coils310amay be connected to a pad330.

For example, as illustrated inFIG. 6A, a pad330may be disposed inside of an auxiliary coil310ahaving a helical structure and one end of the auxiliary coil310amay be connected to the pad330.

Furthermore, as illustrated inFIG. 6B, an auxiliary coil310baccording to another embodiment of the present disclosure may form a closed loop.

For example, one end and the other end of the auxiliary coil310bmay be connected to each other.

As illustrated inFIG. 6C, the auxiliary coil310caccording to another embodiment of the present disclosure may be connected to a pad330and at the same time form a closed loop.

For example, one end of the auxiliary coil310cmay be connected to the other end and the pad330may be connected to the one end of the auxiliary coli310cat the center of the auxiliary coil.

Meanwhile, referring toFIG. 6D, the auxiliary coil310daccording to another embodiment of the present disclosure may have a circular helical structure having a circular helical coil, which is different from the auxiliary coil310having a parallelogram helical structure illustrated inFIGS. 4 and 5. Both ends of the circular helical coil310dmay be connected to each other to form a closed loop. The circular helical structure may further include a pad at the center of the circular helical structure.

As illustrated inFIG. 6E, the auxiliary coil310eaccording to another embodiment of the present disclosure may be connected to a pad330and at the same time form a closed loop.

For example, one end of the auxiliary coil310emay be connected to the other end and the pad330may be connected to the one end of the auxiliary coli310eat the center of the auxiliary coil.

An inductive touch sensor may sense a touch by a stylus that causes change in a magnetic field.

According to an embodiment of the present disclosure, it is possible to provide a display device that is capable of sensing a touch event that may cause little or no change in a magnetic field by providing a coil on the front surface of the display unit. Thus, the display device may detect a touch event by not only a stylus but a finger.