Sensor-equipped display device

Patent metadata

Field	Value
Publication number	US-2022147174-A1
Application number	US-202217580930-A
Country	US
Kind code	A1
Filing date	Jan 21, 2022
Priority date	Jul 31, 2019
Publication date	May 12, 2022
Grant date	—

Abstract

According to an aspect, a sensor-equipped display device includes: an array substrate; a counter substrate; a first sensor configured to detect a first detection-target object close to the counter substrate; and a second sensor configured to detect a second detection-target object close to the array substrate. A first background of the array substrate is viewed from outside the counter substrate, and a second background of the counter substrate is viewed from outside the array substrate.

First claim

What is claimed is:

1 . A sensor-equipped display device comprising:
an array substrate; a counter substrate; a first sensor configured to detect a first detection-target object close to the counter substrate; and a second sensor configured to detect a second detection-target object close to the array substrate, wherein a first background of the array substrate is viewed from outside the counter substrate, and a second background of the counter substrate is viewed from outside the array substrate.

2 . The sensor-equipped display device according to claim 1 , comprising:
a cover glass bonded to the counter substrate; a liquid crystal layer between the array substrate and the counter substrate; and a light source disposed so as to emit light into a side surface of the cover glass and a side surface of the counter substrate, wherein the cover glass is located between the counter substrate and the first sensor, and the second sensor is provided to the array substrate.

3 . The sensor-equipped display device according to claim 2 , wherein
the array substrate comprises a plurality of pixel electrodes each disposed in a corresponding one of pixels and holding capacitance electrodes at least partially overlapping the pixel electrodes in a plan view with an inorganic insulating layer interposed between the holding capacitance electrodes and the pixel electrodes, and the holding capacitance electrodes are divided by slits and serve as drive electrodes of the second sensor.

4 . The sensor-equipped display device according to claim 3 , wherein
the counter substrate comprises common electrodes in positions overlapping the pixel electrodes, the common electrodes are divided to have a size of substantially the same outer shape in the plan view as that of each of the drive electrodes of the second sensor, and the common electrodes are electrically coupled to the drive electrodes of the second sensor overlapping the common electrodes in the plan view.

5 . The sensor-equipped display device according to claim 4 , wherein the common electrodes are electrically coupled to the holding capacitance electrodes in positions of spacers located between the counter substrate and the array substrate.

6 . The sensor-equipped display device according to claim 3 , wherein a plurality of detection electrodes of the second sensor are provided to a principal surface of the array substrate opposite to the counter substrate.

7 . The sensor-equipped display device according to claim 6 , wherein
the detection electrodes of the second sensor extend in a first direction and are arranged in a second direction, and the holding capacitance electrodes extend in the second direction and are arranged in the first direction.

8 . The sensor-equipped display device according to claim 6 , further comprising a protective layer that covers the detection electrodes of the second sensor, wherein
an effective sheet resistance value of the protective layer is in a range from 10 9 ohm/square to 10 12 ohm/square.

9 . The sensor-equipped display device according to claim 2 , wherein
the array substrate comprises a plurality of pixel electrodes each disposed in a corresponding one of pixels and holding capacitance electrodes at least partially overlapping the pixel electrodes in a plan view with an inorganic insulating layer interposed between the holding capacitance electrodes and the pixel electrodes, and the holding capacitance electrodes are divided by slits and serve as detection electrodes of the second sensor arranged in a matrix having a row-column configuration in a first direction and a second direction.

10 . The sensor-equipped display device according to claim 9 , wherein
the counter substrate comprises common electrodes in positions overlapping the pixel electrodes, the common electrodes are divided into a matrix having a row-column configuration in the first direction and the second direction, and the common electrodes are electrically coupled to the detection electrodes of the second sensor overlapping the common electrodes in the plan view.

11 . The sensor-equipped display device according to claim 4 , wherein
the counter substrate comprises a light-blocking layer, and a width of the light-blocking layer is greater than a distance between the adjacent common electrodes.

12 . The sensor-equipped display device according to claim 3 , comprising a metal layer stacked on the holding capacitance electrodes.

13 . The sensor-equipped display device according to claim 12 , wherein
the array substrate comprises:
a plurality of signal lines arranged with spaces in a first direction; and
a plurality of scanning lines arranged with spaces in a second direction, and
in the plan view, a width of the metal layer overlapping the signal lines is greater than a width of each of the signal lines, and a width of the metal layer overlapping the scanning lines is greater than a width of each of the scanning lines.

14 . The sensor-equipped display device according to claim 7 , wherein
a first detection period in which the first sensor performs detection operation is processed at the same time as a display period, and a second detection period in which the second sensor performs the detection operation is processed separately from the display period in a time-division manner.

15 . The sensor-equipped display device according to claim 7 , wherein
a first detection period in which the first sensor performs detection operation is processed at the same time as a display period, and a second detection period in which the second sensor performs the detection operation is processed at the same time as a light emission period among a vertical scanning period in which writing is performed to the common electrodes that is included in the display period and the light emission period in which the light source emits the light.

16 . The sensor-equipped display device according to claim 14 , comprising:
a first sensor detection circuit configured to process a detection signal of the first sensor; and a second sensor detection circuit configured to process a detection signal of the second sensor, wherein a frequency of report signals of one of the first sensor detection circuit and the second sensor detection circuit is higher than a frequency of report signals of the other of the first sensor detection circuit and the second sensor detection circuit.

17 . The sensor-equipped display device according to claim 7 , further comprising a first sensor detection circuit configured to process a detection signal of the first sensor, wherein
the array substrate comprises:
a plurality of signal lines arranged with spaces in a first direction;
a plurality of scanning lines arranged with spaces in a second direction; and
a drive circuit comprising a gate drive circuit coupled to the scanning lines, a source drive circuit coupled to the signal lines, and a second sensor detection circuit configured to process a detection signal of the second sensor, and
a frequency of report signals of the first sensor detection circuit among the first sensor detection circuit and the second sensor detection circuit is higher than a frequency of report signals of the second sensor detection circuit.

18 . The sensor-equipped display device according to claim 2 , further comprising a signal processing circuit, wherein
the signal processing circuit is configured to
process an image that is displayed together with the first background in accordance with a detection s

Assignees

• Japan Display Inc

Inventors

• Ikeda Masanobu
• Takada Naoki
• Okuyama Kentaro

Classifications

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/0445

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title

• G06F3/04166

  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 title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04112

  Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material · CPC title