Transparent display device with touch sensor

Patent metadata

Field	Value
Publication number	US-12144228-B2
Application number	US-202217977899-A
Country	US
Kind code	B2
Filing date	Oct 31, 2022
Priority date	Dec 17, 2021
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

A transparent display device is provided, which may reduce or minimize loss of light transmittance due to a touch sensor and a touch line, and may detect a defective touch sensor in a touch block. The transparent display device with a touch sensor comprises a plurality of transmissive areas and a non-transmissive area disposed between the transmissive areas adjacent to each other, a plurality of pixels provided in the non-transmissive area, including a plurality of subpixels, a touch block including a plurality of touch sensors disposed in the plurality of transmissive areas, a plurality of touch connection portions respectively connected to the plurality of touch sensors, transferring a touch sensing voltage to the connected touch sensor and including a first high resistance area, and a plurality of sensing transistors respectively connected to the plurality of touch sensors, sensing a voltage of the connected touch sensor.

First claim

The invention claimed is:

1. A transparent display device with a touch sensor, the transparent display device comprising:
a plurality of transmissive areas and a non-transmissive area disposed between the transmissive areas adjacent to each other;
a plurality of pixels provided in the non-transmissive area, including a plurality of subpixels;
a touch block including a plurality of touch sensors disposed in the plurality of transmissive areas;
a plurality of touch connection portions respectively coupled to the plurality of touch sensors, transferring a touch sensing voltage to the coupled touch sensor and including a first high resistance area;
a plurality of sensing transistors respectively coupled to the plurality of touch sensors, sensing a voltage of the coupled touch sensor;
a sensing line provided in the non-transmissive area and electrically connected to the plurality of sensing transistors; and
a plurality of scan lines provided in the non-transmissive area, supplying a scan signal to each of the plurality of sensing transistors,
wherein each of the plurality of sensing transistors is turned on in response to the scan signal to transfer a voltage of the connected touch sensor to the sensing line.

2. The transparent display device of claim 1 , wherein the touch block is provided as a plurality of touch blocks, and each of the plurality of touch blocks senses voltages of a plurality of touch sensors through one sensing line.

3. The transparent display device of claim 1 , wherein the sensing line senses the voltages of the plurality of touch sensors per scan line.

4. The transparent display device of claim 1 , wherein the first high resistance area at least partially overlaps the touch sensor.

5. The transparent display device of claim 1 , wherein each of the plurality of touch connection portions includes a resistance sensor provided in the first high resistance area.

6. The transparent display device of claim 5 , wherein the resistance sensor includes a high resistance line made of a silicon-based semiconductor material or an oxide-based semiconductor material.

7. The transparent display device of claim 1 , wherein each of the plurality of touch connection portions includes a resistance transistor provided with an active layer, a gate electrode, a source electrode, and a drain electrode in the first high resistance area.

8. The transparent display device of claim 1 , wherein the plurality of touch sensors correspond to the plurality of pixels one-to-one.

9. The transparent display device of claim 1 , wherein each of the plurality of subpixels includes a light emitting element provided with an anode electrode, a light emitting layer, and a cathode electrode, and each of the plurality of touch sensors includes a touch sensor electrode, and
wherein the cathode electrode constituting the light emitting element and the touch sensor electrode constituting the touch sensor are provided in a same layer.

10. The transparent display device of claim 9 , further comprising a first undercut structure provided in the transmissive area, having a planar closed shape,
wherein the cathode electrode and the touch sensor electrode are separated from each other by the first undercut structure.

11. The transparent display device of claim 9 , further comprising a sensing line detecting whether a short-circuit occurs between the cathode electrode and the touch sensor electrode,
wherein each of the sensing transistors is electrically connected to the sensing line to transfer a voltage applied to the coupled touch sensor electrode to the sensing line.

12. The transparent display device of claim 11 , further comprising:
a common power line provided in the non-transmissive area and electrically connected to the cathode electrode;
a touch line provided in the non-transmissive area and electrically connected to the touch sensor electrode;
a plurality of scan lines provided in the non-transmissive area, supplying a scan signal to the plurality of pixels or the plurality of sensing transistors;
a plurality of first line areas in which the plurality of touch sensors are disposed in a line in a direction in which the scan line is extended; and
a defect detector controlling a first voltage and a second voltage to be applied to the common power line and the touch line, respectively, sensing voltages of the touch sensors for each of the first line areas through the sensing line and determining a first line area, in which a defective touch sensor is included, among the plurality of first line areas based on the sensed voltage for each first line area.

13. The transparent display device of claim 9 , further comprising:
a common power line supplying a cathode power source to the cathode electrode of the light emitting element; and
a cathode power area to which the cathode power source is applied through the common power line,
wherein the cathode power area includes a first cathode power area disposed between touch sensors adjacent to each other in a second direction and a second cathode power area disposed between touch sensors adjacent to each other in the first direction, and
wherein the second cathode power area is a second high resistance area having resistance of 1KΩ or more.

14. The transparent display device of claim 13 , wherein the common power line includes a first common power line provided in a first layer in the first cathode power area and a second common power line provided in a second layer in the second cathode power area, and
wherein the second common power line is made of a silicon-based semiconductor material or an oxide-based semiconductor material.

15. The transparent display device of claim 13 , further comprising:
a plurality of second line areas in which the plurality of touch sensors are disposed in a line in a direction in which the common power line is extended;
a pixel power line electrically connected to the anode electrode of the light emitting element;
a touch line electrically connected to the touch sensor; and
a defect detector controlling a third voltage and a fourth voltage to be applied to the pixel power line and the touch line, respectively, and determining a second line area, in which a defective touch sensor is included, among the plurality of second line areas based on a current or luminance of the plurality of pixels emitting light by a current generated between the pixel power line and the touch line.

16. A transparent display device with a touch sensor, the transparent display device comprising:
a substrate provided with a transmissive area and a non-transmissive area;
a touch sensor provided in the transmissive area over the substrate, including a touch sensor electrode;
a light emitting element provided in the non-transmissive area over the substrate, including an anode electrode, a light emitting layer, and a cathode electrode;
a sensing line detecting whether a short-circuit occurs between the cathode electrode and the touch sensor electrode;
a sensing transistor electrically connecting the touch sensor electrode of the touch sensor with the sensing line; and
a scan line supplying a scan signal to the sensing transistor.

17. The transparent display device of claim 16 , wherein the sensing transistor is turned on in response to the scan signal to transfer a voltage applied to the touch sensor electrode to the sensing line.

18. The transparent display device of claim 16 , further comprising:
a plurality of touch lines extended in the non-transmissive area in a first direction; and
a touch connection

Assignees

• Lg Display Co Ltd

Inventors

• Park Jaehee
• Im Jonghyeok
• LEE Kihyung

Classifications

• H10K59/351

  comprising more than three subpixels, e.g. red-green-blue-white [RGBW] · CPC title

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/353

  characterised by the geometrical arrangement of the RGB subpixels · CPC title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title

• G06F3/0446

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