INPUT DEVICE AND DISPLAY DEVICE

• US 20180329543A1
• Filed: 07/25/2018
• Published: 11/15/2018
• Est. Priority Date: 03/30/2015
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: NAKANISHI, Takayuki, TAMAKI, Masaya, YATA, Tatsuya
• Granted Patent: US 10,635,250 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

An input device includes a first substrate, a first light-emitting element unit, and a third electrode unit. The first substrate has a first surface and a second surface. The first light-emitting element includes a first electrode unit formed on the second surface, a second electrode unit formed in a layer different from that of the first electrode unit, and a luminescent layer electrically in contact with at least a part of the first electrode unit and a part of the second electrode unit, and formed between the first electrode unit and the second electrode unit. The third electrode unit is insulated from the first electrode unit and detects a change in an electric field between the first electrode unit and the third electrode unit depending on coordinates of a proximity object present at a position overlapping with the first surface in planar view.

Claims

1. An input device comprising:

a first substrate having a first surface and a second surface;

a first light-emitting element unit including

a first electrode unit formed on the second surface,

a second electrode unit formed in a layer different from a layer of the first electrode unit, and

a luminescent layer electrically in contact with at least a part of the first electrode unit and a part of the second electrode unit, and formed between the first electrode unit and the second electrode unit; and

a third electrode unit insulated from the first electrode unit and that detects a change in an electric field between the first electrode unit and the third electrode unit depending on coordinates of a proximity object present at a position overlapping with the first surface in planar view, wherein

the first electrode unit includes a plurality of first conductive layers formed in one layer,

the second electrode unit includes a second conductive layer having a size overlapping with the first conductive layers in planar view,

the third electrode unit includes a plurality of third conductive layers formed in one layer different from the layer of the first conductive layers, and

a drive signal pulse is applied to a part of the first conductive layers, the drive signal pulse rising in a reverse-bias direction opposite to a forward-bias direction of a voltage applied between the first conductive layers and the second conductive layer at which the first light-emitting element unit emits light.

2. The input device according to claim 1, wherein

the first conductive layers have a shape continuously extending in a first direction in planar view and are in contact with the luminescent layer along the shape of the first conductive layers, and

the first light-emitting element unit is capable of emitting light along the shape of the first conductive layers.

3. The input device according claim 1, wherein the first light-emitting element unit includes a first light-blocking portion that is arranged closer to the first surface than the luminescent layer is.

4. The input device according to claim 1, further comprising:

a first electrode driver that supplies a voltage to the first electrode unit;

a second electrode driver that supplies a voltage to the second electrode unit; and

a proximity detecting unit that processes the change in the electric field as a proximity detection signal in response to the drive signal pulse, wherein

the first electrode driver scans a part of the first electrode unit as a drive electrode in a time-division manner and supplies the drive signal pulse to the scanned part of the first electrode unit.

5. The input device according to claim 1, further comprising:

a first electrode driver that supplies a voltage to the first electrode unit;

a second electrode driver that supplies a voltage to the second electrode unit; and

a proximity detecting unit that processes the change in the electric field as a proximity detection signal in response to the drive signal pulse, wherein

the second electrode driver applies the forward-bias voltage between the first electrode unit and the second electrode unit, thereby causing the first light-emitting element unit to emit light.

6. The input device according to claim 5, wherein the first electrode driver applies a pulse signal of a non-lighting period which rises in the reverse-bias direction to the first electrode unit.

7. The input device according to claim 1, further comprising:

a first electrode driver that supplies a voltage to the first electrode unit;

a second electrode driver that supplies a voltage to the second electrode unit; and

a proximity detecting unit that processes the change in the electric field as a proximity detection signal in response to the drive signal pulse, wherein

the first electrode driver applies a lighting pulse which rises in the forward-bias direction, thereby causing the first light-emitting element unit to emit light in response to the lighting pulse.

8. The input device according to claim 7, wherein, when a request signal for the drive signal pulse output before the drive signal pulse coincides with a request signal for the lighting pulse output before the lighting pulse, the first electrode driver applies the drive signal pulse to the first electrode unit and then applies the lighting pulse to the first electrode unit.

9. The input device according to claim 7, wherein, when the drive signal pulse coincides with the lighting pulse, the first electrode driver divides the lighting pulse into a front part and a rear part at timing when the drive signal pulse coincides with the lighting pulse and then sequentially applies a first lighting pulse resulting from division, the drive signal pulse, and a second lighting pulse resulting from division, to the first electrode unit.

10. The input device according to claim 9, wherein the first electrode driver applies the first lighting pulse and the drive signal pulse such that a fall of the first lighting pulse is continuous with a rise of the drive signal pulse.

11. The input device according to claim 7, wherein, when the lighting pulse coincides only with a request signal for the drive signal pulse output before the drive signal pulse, the first electrode driver sequentially applies the lighting pulse and the drive signal pulse to the first electrode unit.

12. A display device comprising:

an input device comprising;

a first substrate having a first surface and a second surface;

a first light-emitting element unit including

a first electrode unit formed on the second surface,

a second electrode unit formed in a layer different from a layer of the first electrode unit, and

a luminescent layer electrically in contact with at least a part of the first electrode unit and a part of the second electrode unit, and formed between the first electrode unit and the second electrode unit; and

a third electrode unit insulated from the first electrode unit and that detects a change in an electric field between the first electrode unit and the third electrode unit depending on coordinates of a proximity object present at a position overlapping with the first surface in planar view; and

a display unit provided on the second surface of the input device and capable of displaying an image on the first surface, wherein

the first electrode unit includes a plurality of first conductive layers formed in one layer,

the second electrode unit includes a second conductive layer having a size overlapping with the first conductive layers in planar view,

the third electrode unit includes a plurality of third conductive layers formed in one layer different from the layer of the first conductive layers, and

a drive signal pulse is applied to a part of the first conductive layers, the drive signal pulse rising in a reverse-bias direction opposite to a forward-bias direction of a voltage applied between the first conductive layers and the second conductive layer at which the first light-emitting element unit emits light.