Display panel and display device

Patent metadata

Field	Value
Publication number	US-9665229-B2
Application number	US-201514951461-A
Country	US
Kind code	B2
Filing date	Nov 24, 2015
Priority date	Dec 31, 2014
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A display panel and a display device are disclosed. The display panel includes a color filter substrate and an array substrate disposed opposite to each other and a liquid crystal layer located therebetween; the color filter substrate includes a plurality of touch drive electrodes parallelly arranged along a first direction; the array substrate comprises two groups of waveform generation circuits, which are respectively arranged at both ends of the touch drive electrodes, located in a frame area of the array substrate, where each group of waveform generation circuits comprises a plurality of touch drive waveform generation circuits, the touch drive electrode is electrically connected with one or more of the touch drive waveform generation circuits, and the plurality of touch drive waveform generation circuits are configured for generating touch drive signals and providing the generated touch drive signals to the touch drive electrodes.

First claim

We claim:

1. A display panel, comprising a color filter substrate, an array substrate disposed opposite to the color filter substrate and a liquid crystal layer located between the color filter substrate and the array substrate, wherein,
the color filter substrate comprises a plurality of touch drive electrodes which are parallelly arranged along a first direction;
the array substrate comprises two groups of waveform generation circuits located in a frame area of the array substrate, and the two groups of waveform generation circuits are respectively arranged at both ends of the touch drive electrodes, where each group of waveform generation circuits comprises a plurality of touch drive waveform generation circuits, the touch drive electrode is electrically connected with one or more of the touch drive waveform generation circuits, and the plurality of touch drive waveform generation circuits are configured for generating touch drive signals and providing the generated touch drive signals to the touch drive electrodes.

2. The display panel of claim 1 , wherein the color filter substrate further comprises a black matrix and a color filter layer;
the touch drive electrode is located on a surface at a side of the black matrix away from the color filter layer; or
the touch drive electrode is located between the black matrix and the color filter layer; or
the touch drive electrode is located on a surface at a side of the color filter layer away from the black matrix.

3. The display panel of claim 2 , wherein the touch drive electrode has a bar shape.

4. The display panel of claim 1 , wherein the color filter substrate further comprises a black matrix, the touch drive electrode has a grid shape, and a projection of the black matrix covers a projection of the touch drive electrode in the light transmittance direction.

5. The display panel of claim 4 , wherein a grid unit of the touch drive electrode surrounds at least one opening of the black matrix.

6. The display panel of claim 4 , wherein the touch drive electrode is made of metal.

7. The display panel of claim 1 , wherein the plurality of touch drive waveform generation circuits in each group of waveform generation circuits are parallelly arranged along the first direction, and each of the touch drive waveform generation circuits extends along an extension direction of the touch drive electrode to be electrically connected with the touch drive electrode.

8. The display panel of claim 1 , wherein each of the plurality of touch drive electrodes is connected with one touch drive waveform generation circuit, and the plurality of touch drive waveform generation circuits are configured to generate identical touch drive signals.

9. The display panel of claim 8 , wherein one touch drive electrode or at least two adjacent touch drive electrodes form a group of touch drive electrodes; one of the two groups of waveform generation circuits is electrically connected with odd-numbered groups of touch drive electrodes, and the other one of the two groups of waveform generation circuits is electrically connected with even-numbered groups of touch drive electrodes.

10. The display panel of claim 1 , wherein each of the plurality of touch drive electrodes is connected with two of the plurality of touch drive waveform generation circuits, and the two touch drive waveform generation circuits connected with each of the plurality of touch drive electrodes are configured to generate different touch drive signals comprising:
touch drive signals with different waveforms or touch drive signals with waveforms of different phases.

11. The display panel of claim 10 , wherein the two touch drive waveform generation circuits connected with each touch drive electrode are located at one end of the touch drive electrode.

12. The display panel of claim 11 , wherein the two touch drive waveform generation circuits connected with each touch drive electrode comprise one or more shared touch drive waveform generation sub-circuits.

13. The display panel of claim 10 , wherein the two touch drive waveform generation circuits connected with each touch drive electrode are located at both ends of the touch drive electrode.

14. The display panel of claim 13 , wherein each group of waveform generation circuit comprises one kind of touch drive waveform generation circuits.

15. The display panel of claim 1 , wherein the touch drive electrode is electrically connected with a touch drive waveform output end disposed in the array substrate and located above the touch drive waveform generation circuit through a conductive frame adhesive, and the touch drive waveform output end is electrically connected with the touch drive waveform generation circuit through a via hole.

16. The display panel of claim 15 , wherein the touch drive electrode is electrically connected with a plurality of the touch drive waveform generation circuits, and a plurality of touch drive waveform output ends electrically connected with the same touch drive electrode are arranged along the first direction or along the extension direction of the touch drive electrode.

17. The display panel of claim 1 , wherein the touch drive electrode is electrically connected with a plurality of the touch drive waveform generation circuits, and when one of the touch drive waveform generation circuits electrically connected with the touch drive electrode provides the touch drive signal to the touch drive electrode, the touch drive waveform output ends corresponding to the rest touch drive waveform generation circuits electrically connected with the touch drive electrode are at a high impedance state.

18. The display panel of claim 1 , wherein operating states of the display panel comprise a displaying state and a touch control state, which operate in a time division mode or a simultaneous mode.

19. The display panel of claim 18 , wherein if the simultaneous mode is adopted for the displaying state and the touch control state, and liquid crystal molecules in the liquid crystal layer are negative liquid crystal molecules.

20. The display panel of claim 18 , wherein if the time division mode is adopted for the displaying state and the touch control state, the touch drive electrode is applied with a common voltage signal or is grounded at the displaying state;
at the touch control state, the touch drive signal is applied to the touch drive electrode.

21. A display device, comprising the display panel comprising a color filter substrate, an array substrate disposed opposite to the color filter substrate and a liquid crystal layer located between the color filter substrate and the array substrate, wherein,
the color filter substrate comprises a plurality of touch drive electrodes which are parallelly arranged along a first direction;
the array substrate comprises two groups of waveform generation circuits located in a frame area of the array substrate, and the two groups of waveform generation circuits are respectively arranged at both ends of the touch drive electrodes, where each group of waveform generation circuits comprises a plurality of touch drive waveform generation circuits, the touch drive electrode is electrically connected with one or more of the touch drive waveform generation circuits, and the plurality of touch drive waveform generation circuits are configured for generating touch drive signals and providing the generated touch drive signals to the touch drive electrodes.

Assignees

• Shanghai Tianma Microelectronics Co Ltd
• Tianma Microelectronics Co Ltd

Inventors

• Lu Feng
• Huang Zhongshou
• Zhang Xianxiang
• Li Xiaoye
• Liu Gang
• Xu Yingying

Classifications

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · 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

• G06F3/0445

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