Transparent display device with touch sensor

Patent metadata

Field	Value
Publication number	US-12527199-B2
Application number	US-202418773196-A
Country	US
Kind code	B2
Filing date	Jul 15, 2024
Priority date	Dec 20, 2021
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A transparent display device with a touch sensor is provided, which may reduce 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 device includes transmissive areas and a non-transmissive area disposed between the transmissive areas adjacent to each other, a plurality of touch lines provided in the non-transmissive area, and a plurality of touch blocks respectively connected to the plurality of touch lines. Each touch block includes a plurality of touch sensors disposed in the transmissive areas and comprised of M number of rows and N number of columns, a plurality of sensing lines disposed to correspond to the N number of columns, and a plurality of sensing transistors respectively connected to the plurality of touch sensors, transferring a voltage of the connected touch sensor to one of the plurality of sensing lines.

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 plurality of touch lines provided in the non-transmissive area; a plurality of data lines and a pixel power line provided in the non-transmissive area and extending in a same direction as the plurality of touch lines; and a touch bridge line and a plurality of scan line provided in the non-transmissive area and extending in a same direction as each other; wherein the plurality of touch lines are arranged at each of at least two sides of the transmissive area, wherein the plurality of touch lines and the touch bridge line are electrically connected and form a mesh shape, and wherein cathode electrodes of adjacent subpixels are separated from each other with the transmissive area interposed therebetween.

2 . The transparent display device of claim 1 , further comprising a plurality of touch blocks respectively connected to the plurality of touch lines, wherein each of the plurality of touch blocks includes:
a plurality of touch sensors disposed in the plurality of transmissive areas and comprised of M number of rows and N number of columns; and a plurality of sensing lines disposed to correspond to the N number of columns, wherein each of the plurality of sensing lines is electrically connected to M number of touch sensors extended in a first direction and disposed in a line in the first direction, and wherein M and N are natural numbers greater than 1.

3 . The transparent display device of claim 2 , wherein each of the plurality of touch blocks further includes a plurality of touch connection portions electrically connecting each of the plurality of touch sensors to the touch line, including a high resistance area.

4 . The transparent display device of claim 3 , 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 high resistance area.

5 . The transparent display device of claim 4 , wherein the resistance transistor includes a first resistance transistor electrically connected to a touch sensor electrode of the touch sensor and a second resistance transistor electrically connected to the first resistance transistor and one of the plurality of touch lines, and
wherein a gate electrode of each of the first resistance transistor and the second resistance transistor is electrically connected to a source electrode or a drain electrode.

6 . The transparent display device of claim 3 , wherein the high resistance area at least partially overlaps the touch sensor.

7 . The transparent display device of claim 3 , wherein each of the plurality of touch connection portions includes a resistance sensor that includes a high resistance line made of a silicon-based semiconductor material or an oxide-based semiconductor material in the high resistance area.

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

9 . The transparent display device of claim 8 , wherein each of the plurality of subpixels includes a light emitting element comprised of an anode electrode, a light emitting layer and a-the 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 8 , wherein the touch line is electrically connected to the touch sensor electrode, and
wherein the plurality of scan lines supply a scan signal to the plurality of pixels or the plurality of sensing transistors, wherein the transparent display device further includes:
a common power line provided in the non-transmissive area and electrically connected to the cathode electrode; and
a defect detection circuit controlling a first voltage and a second voltage to be applied to the common power line and the touch line, respectively, sensing the voltage of each of the plurality of touch sensors through the plurality of sensing lines and detecting a defective touch sensor among the plurality of touch sensors based on the sensed voltage.

12 . The transparent display device of claim 1 ,
wherein each of the plurality of touch blocks further includes a plurality of sensing transistors, wherein the plurality of scan lines supply a scan signal to each of the plurality of sensing transistors, and wherein each of the plurality of sensing transistors is electrically connected to one of the plurality of touch sensors and one of the plurality of sensing lines, and transfers the voltage of the connected touch sensor to the connected sensing line when each of the plurality of sensing transistors is turned on in response to the scan signal.

13 . The transparent display device of claim 12 , wherein each of the plurality of sensing transistors at least partially overlaps the connected touch sensor.

14 . The transparent display device of claim 1 , wherein the plurality of sensing lines individually senses the voltages of the plurality of touch sensors.

15 . The transparent display device of claim 1 , wherein each of the plurality of sensing lines is disposed between the plurality of touch lines and the transmissive area.

Assignees

• Lg Display Co Ltd

Inventors

• Park Jaehee
• LEE Kihyung

Classifications

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• H10K59/1213

  the pixel elements being TFTs · CPC title

• H10K59/131

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

• G06F3/0418

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title