Display device with touch sensor

Patent metadata

Field	Value
Publication number	US-10025410-B2
Application number	US-201514981441-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Dec 28, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A display of an electric device includes a plurality of separated transparent electrode blocks, which are configured to provide one or more of supplemental features such as touch recognition. Signal paths between the transparent electrode blocks and the driver for the supplemental feature are implemented with a plurality of conductive lines placed under positioned under one or more planarization layers. The conductive lines implementing the signal paths are routed across the display area, directly toward a non-display area where drive-integrated circuits are located.

First claim

What is claimed is:

1. A display panel, comprising:
a plurality of common signal lines on a substrate;
a lower planarization layer covering the plurality of common signal lines;
an array of thin-film transistors (TFTs) on the lower planarization layer, the array of TFTs connected to a plurality of gate lines and a plurality of data line on the lower planarization layer;
an upper planarization layer covering the array of TFTs; and
a plurality of transparent electrode blocks on the upper planarization layer, each of the plurality of transparent electrode blocks configured to communicate with a driver via a signal path implemented with at least one of the common signal lines, wherein the signal path for at least one of the plurality of transparent electrode blocks is a parallel-connection signal path implemented with a set of common signal lines, the common signal lines of the parallel-connection signal path interconnected to each other in parallel by an interconnection line provided under the lower planarization layer,
wherein each signal path includes a main portion and a tail portion, and wherein the tail portion of a signal path of a first transparent electrode is implemented with a different number of common signal lines from the tail portion of a signal path of a second transparent electrode, and
wherein the tail portion is implemented with a different number of common signal lines from the main portion.

2. The display panel of claim 1 , wherein the signal path for at least one of the transparent electrode blocks is a first parallel-connection signal path implemented with a first set of the common signal lines, and the signal path for another one of the transparent electrode blocks is a second parallel-connection signal path implemented with a second set of the common signal lines distinct from the common signal lines of the first set.

3. The display panel of claim 2 , wherein the second set of common signal lines implementing the second parallel-connection signal path includes a fewer number of common signal lines than a total number of common signal lines in the first set of common signal lines implementing the first parallel-connection signal path.

4. The display panel of claim 3 , wherein the transparent electrode block connected to the second parallel-connection signal path is positioned closer to the driver than the transparent electrode block connected to the first parallel-connection signal path.

5. The display panel of claim 3 , wherein the common signal lines of the first set are interconnected to each other in parallel by an interconnection line provided under the lower planarization layer, and wherein the common signal lines of the second set are interconnected to each other in parallel by another interconnection line provided under the lower planarization layer.

6. The display panel of claim 3 , further comprising a plurality of bypass lines, wherein the signal path is connected to the corresponding ones of the transparent electrode blocks via at least one of the plurality of bypass lines.

7. The display panel of claim 4 , wherein each of the first parallel-connection signal path and the second parallel-connection path includes at least one common signal line routed across an entire display area of the display panel.

8. The display panel of claim 6 , wherein each of the plurality of bypass lines is connected to the signal path via a lower contact hole through the lower planarization layer and connected to the transparent electrode block via an upper contact hole through the upper planarization layer.

9. The display panel of claim 1 , further comprising a plurality of dummy lines disposed under the lower planarization layer, wherein each of the plurality of dummy lines are arranged to extend under one of the data lines.

10. The display panel of claim 9 , wherein at least one of the plurality of dummy lines is electrically connected to a voltage source.

11. The display panel of claim 9 , wherein the plurality of dummy lines include a first dummy line and a second dummy line, the first dummy line extending under one of the data lines that is overlapped with at least one of the common signal lines included in the first set of common signal lines, and the second dummy line extending under one of the data lines that is overlapped with at least one of the common signal lines included in the second set of common signal lines.

12. The display panel of claim 2 , the tail portion is implemented with a fewer number of common signal lines than the main portion.

13. The display panel of claim 11 , wherein the tail portion is configured as an independent parallel-connection signal path provided at an end of the main portion.

14. The display panel of claim 2 , wherein the tail portion including a first section under one of the data lines and a second section under another one of the data lines, the first section and the second section serially connected to each other.

15. A touch screen device, comprising:
a plurality of pixels operated by a pixel electrode and a common electrode, the common electrode including a plurality of separated common electrode blocks, each of the common electrode blocks used in operating one or more of the pixels;
a plurality of thin-film-transistors (TFTs) coupled to the plurality of pixels, the plurality of TFTs disposed on a lower planarization layer;
a touch driver; and
a plurality of common signal lines disposed under the lower planarization layer, wherein each common electrode block of a first group of the common electrode blocks is configured to communicate with the touch driver via a signal path implemented with a set of first number of common signal lines and each of a second group of the common electrode blocks is configured to communicate with the touch driver via a signal path implemented with a set of second number of common signal lines, wherein common signal lines of a set of common signal lines are interconnected to each other in parallel by an interconnection line provided under the lower planarization layer,
wherein each signal path includes a main portion and a tail portion, and wherein the tail portion of a signal path of a first common electrode block is implemented with a different number of common signal lines from the tail portion of a signal path of a second common electrode block, and
wherein the tail portion is implemented with a different number of common signal lines from the main portion.

16. The touch screen device of claim 15 , wherein the touch driver is distanced further away from the common electrode blocks of the first group than the touch driver is distanced from the common electrode blocks of the second group, and the set of first number of common signal lines includes a greater number of common signal lines than the set of second number of common signal lines.

17. The touch screen device of claim 16 , wherein the common electrode blocks of the first group and the common electrode blocks of the second group are collectively arranged in a single column or in a single row.

18. The touch screen device of claim 17 , wherein the main portion is implemented with all of the common signal lines of the set of first number of common signal lines, and the tail portion is implemented with a subset of common signal lines from the set of first number of common signal lines implementing the signal path.

19. The touch screen device of claim 18 , wherein, among the set of first number of common signal lines, the common signal lines of the subset are longer than remainder of common signal lin

Assignees

• Lg Display Co Ltd

Inventors

• Kim Jongbin
• Jung Moonseok
• Park Kyoungseok
• Lee Joonho

Classifications

• G09G3/3655

  Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors · CPC title

• G09G2300/0413

  Details of dummy pixels or dummy lines in flat panels · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04809

  Textured surface identifying touch areas, e.g. overlay structure for a virtual keyboard · CPC title

• G09G3/3677

  suitable for active matrices only · CPC title