Touch control display panel with touch control dual-gate thin film transistors and touch display device

• US 9,898,144 B2
• Filed: 12/10/2013
• Issued: 02/20/2018
• Est. Priority Date: 12/21/2012
• Status: Active Grant

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Inventors: Huang, Zhongshou
• Primary Examiner(s): Yang, Kwang-Su
• Application Number:
  US14/102,018
• Publication Number:
  US 20140176494A1
• Time in Patent Office: 1,533 Days
• Field of Search: 345174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/13398 Spacer materials; Spacer properties
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

The invention discloses a touch control display panel and a touch control display apparatus, where the touch control display panel includes a TFT array substrate and a color film substrate arranged in opposition; the TFT array substrate includes a pixel array and a touch control dual-gate TFT array; and when there is a touch control occurring, an electrically conductive post at a press location approaches the touch control dual-gate TFT along with a press, and a channel current of the touch control dual-gate TFT can be modulated by a current generated by the electrically conductive post. There will be no interference with a display per se in operation of the touch control, and no adverse influence imposed on the arrangement of liquid crystals in the liquid crystal display panel. The process of preparing the pixel array can be compatible with that of the touch control dual-gate TFTs, greatly lowering cost.

Claims

1. A touch control display panel, comprising:

a TFT (Thin Film Transistor) array substrate including a plurality of touch control dual-gate TFTs, each having a top gate and a bottom gate, wherein the top gate is insulated from both the bottom gate and a touch control gate line, and the bottom gate is electrically connected with the touch control gate line; and

a color film substrate arranged in opposition of the TFT array substrate, the color film substrate comprising a plurality of electrically conductive posts on the surface facing the TFT array substrate,

wherein each of the plurality of electrically conductive posts is arranged in correspondence to one of the plurality of touch control dual-gate TFTs, and

wherein during a touch action, one of the plurality of electrically conductive posts is not electrically connected with the top gate of the touch control dual-gate TFT, and channel current of the touch control dual-gate TFT is modulated by a capacitive interaction formed between the electrically conductive post and the top gate of the touch control dual-gate TFT.

2. The touch control display panel according to claim 1, wherein the TFT array substrate further comprises a pixel array comprising:

a plurality of scan lines;

a plurality of data lines intersecting with, but insulated from, the plurality of scan lines; and

a plurality of pixel elements, each of which is arranged in a pixel area surrounded by adjacent scan lines and adjacent data lines.

3. The touch control display panel according to claim 2, further comprising a plurality of touch control gate lines, wherein the scan lines and the touch control gate lines are located at the same layer and made of the same material and extend in the same direction;

and the data lines are located at the same layer and of the same material and extend in the same direction as a plurality of touch control drive lines and a plurality of touch control sense lines.

4. The touch control display panel according to claim 2, wherein each of the pixel areas is arranged with one of the touch control dual-gate TFTs or a pixel area of a predetermined number of the pixel elements is arranged with one of the touch control dual-gate TFTs.

5. The touch control display panel according to claim 1, wherein the TFT array substrate further comprises a pixel array sharing the plurality of touch control gate lines as scan lines, and wherein the pixel array comprises:

a plurality of data lines intersecting with, but insulated from, the plurality of scan lines; and

a plurality of pixel elements, each of which is arranged in a pixel area surrounded by adjacent scan lines and adjacent data lines.

6. The touch control display panel according to claim 5, wherein the data lines are located at the same layer and made of the same material and extend in a same direction as the touch control drive lines and the touch control sense lines.

7. The touch control display panel according to claim 1, wherein the TFT array substrate further comprises a pixel array sharing the plurality of touch control gate lines as scan lines and sharing the plurality of touch control drives lines as data lines, and wherein the pixel array comprises a plurality of pixel elements, each of which is arranged in a pixel area surrounded by adjacent scan lines and adjacent data lines.

8. The touch control display panel according to claim 7, wherein the data lines are located at the same layer and made of the same material and extend in the same direction as the touch control sense lines.

9. The touch control display panel according to claim 1, wherein during touch action, the electrically conductive post near the touch is sufficiently close to the top gate of the touch control dual-gate TFT to induce a current of the touch control dual-gate TFT.

10. The touch control display panel according to claim 1, wherein the TFT array substrate further comprises touch control electrodes on a surface layer thereof, which are electrically connected with the bottom gates of the touch control dual-gate TFTs, the top gates of the touch control dual-gate TFTs are electrically connected with the touch control gate lines, and when there is a touch control occurring, the electrically conductive posts are electrically connected with the touch control electrodes.

11. The touch control display panel according to claim 1, wherein the TFT array substrate further comprises touch control electrodes on a surface layer thereof, which are electrically connected with the bottom gates of the touch control dual-gate TFTs, the top gates of the touch control dual-gate TFTs are electrically connected with the touch control gate lines, and when there is a touch control occurring, the free ends of the electrically conductive posts are sufficiently close to the top gates of the touch control dual-gate TFTs to thereby have the currents of the touch control dual-gate TFTs modulated by the electrically conductive posts.

12. The touch control display panel according to claim 1, wherein the color film substrate further comprises a first electrically conductive layer electrically connected with the plurality of electrically conductive posts.

13. The touch control display panel according to claim 12, wherein the first electrically conductive layer is of an integral structure.

14. The touch control display panel according to claim 13, wherein at least two of the touch control drive lines, the touch control sense lines and the touch control gate lines intersect with but are insulated from each other.

15. The touch control display panel according to claim 14, wherein the touch control sense lines and the touch control gate lines intersect with but are insulated from each other and determine coordinates of a touch control location.

16. The touch control display panel according to claim 12, wherein the first electrically conductive layer comprises a plurality of separate first conductive lines, each of which is electrically connected with at least one of the electrically conductive posts.

17. The touch control display panel according to claim 16, wherein at least two of the touch control drive lines, the touch control sense lines, the touch control gate lines and the first conductive lines intersect with, but insulated from, each other.

18. The touch control display panel according to claim 17, wherein the touch control gate lines and the first conductive lines intersect with, but insulated from, each other and determine coordinates of a touch control location.

19. The touch control display panel according to claim 1, wherein each of the plurality of the electrically conductive posts comprises an insulation post body and a second electrically conductive layer on the surface of the insulation post body, and wherein the first electrically conductive layer and the second electrically conductive layer are connected and are located on the same layer and made of the same material.

20. The touch control display panel according to claim 1, wherein the plurality of electrically conductive posts are made of an electrically conductive organic material, and wherein a first electrically conductive layer is an electrically conductive black matrix.

21. The touch control display panel according to claim 20, wherein the color film substrate further comprises an upper substrate and a color-resist layer, and wherein the black matrix is located between the upper substrate and the color-resist layer, or the black matrix is located between the color-resist layer and the plurality of electrically conductive posts.

22. The touch control display panel according to claim 1, wherein the touch control display panel further comprises primary posts, each of which has two ends, and wherein when there is no touch control occurring, both ends of each of the primary posts contact respectively with the TFT array substrate and the color film substrate.

23. The touch control display panel according to claim 22, wherein the length of each of the primary posts is equal to that of each of the electrically conductive posts.

24. The touch control display panel according to claim 22, wherein each of the primary posts comprises a first primary post and a second primary post, and wherein the first primary post transmits an external drive signal from the TFT array substrate to the electrically conductive layer on the color film substrate.

25. The touch control display panel according to claim 24, wherein the touch control display panel further comprises frame sealing glue on the periphery of the touch control display panel to bond the color film substrate and the TFT array substrate together, and the first primary post is located in the frame sealing glue or on a side of the frame sealing glue proximate to a liquid crystal layer or on a side of the frame sealing glue distant from the liquid crystal layer.